JP7038596B2 - Manufacturing method of absorbent articles - Google Patents

Description

The present invention relates to a method for producing an absorbent article.

An absorbent article including an absorber having a high basis weight portion, which is a portion having a high basis weight, and a low basis weight portion, which is a portion having a low basis weight, and a surface sheet is known. For example, Patent Document 1 discloses an absorbent core having a high basis weight portion and a low basis weight portion, and an absorbent article including a front surface sheet and a back surface sheet. The high basis weight portion and the low basis weight portion are formed alternately in the longitudinal direction and the width direction of the absorbent article. The absorbent article is formed with grooves in which the surface sheet and the absorbent core are integrally recessed. According to Patent Document 1, the groove, the high basis weight portion and the low basis weight portion exert an action of absorbing and diffusing excrement liquid. In addition, since the absorbent core is likely to be deformed into a shape that rises toward the wearer's skin with the low basis weight portion as the base axis, the area facing the excretion port of the absorbent core is the wearer's skin at the time of wearing. It is said that it can be easily deformed into a shape that can be pressed against. Then, it is said that the fit of the absorbent article is improved, the wearer is given a comfortable wearing feeling, and the leakage of menstrual blood is effectively suppressed.

Japanese Unexamined Patent Publication No. 2013-9946

In Patent Document 1, after the surface sheet is supplied on one surface of the absorber, a predetermined portion is concavely formed from the surface sheet side toward the absorber side by embossing using an embossing roll device having an engraving roll and a smoothing roll. By pressing (squeezing), a groove is formed in the predetermined portion. Here, on the outer peripheral surface of the engraving roll, a convex portion erected toward the outside in the radial direction is formed. Then, in the embossing process, the laminated body of the surface sheet and the absorber is pressed by the convex portion thereof to form a groove. The groove, that is, the squeezed portion is formed so that the portion that is relatively deeply recessed, that is, the high-pressure squeezed portion and the portion that is relatively shallowly recessed, that is, the low-pressure squeezed portion are adjacent to each other in a plan view. To.

However, according to the study of the inventor, when the squeezed portion is formed, if the high-pressure squeezed portion and the low-pressure squeezed portion are formed adjacent to each other in the high basis weight portion and the low basis weight portion, the following problems occur. It turns out that it can happen.

Normally, in a roll for embossing, what is the height from the outer peripheral surface of the roll in the portion of the convex portion that presses the high basis weight portion and the height from the outer peripheral surface of the roll in the portion that presses the low basis weight portion? It is the same. Specifically, among the convex portions, the height of the convex portion for high-pressure squeezing that presses the high basis weight portion and the height of the convex portion for high-pressure squeezing that presses the low basis weight portion are the same. Similarly, among the convex portions, the height of the convex portion for low-pressure squeezing that presses the high basis weight portion and the height of the convex portion for low-pressure squeezing that presses the low basis weight portion are the same. When forming a squeezed portion in that state, if the difference between the height of the convex portion for high-pressure squeezing and the height of the convex portion for low-pressure squeezing is too small, the high-pressure squeezed portion is formed in the high basis weight portion. The force applied to the region may be dispersed in the region where adjacent low pressure squeezed portions are formed. In that case, the convex portion for high-pressure squeezing cannot sufficiently squeeze the absorber (high basis weight portion), and the surface sheet is easily peeled off from the bottom of the high-pressure squeezing portion and floats easily. In other words, in the portion where the high basis weight portion of the convex portion is squeezed, if the difference in the degree of squeezing between the low pressure squeezing convex portion and the high pressure squeezing convex portion is relatively small, the surface sheet is released from the bottom of the high pressure squeezing portion. It peels off and becomes easy to float. On the other hand, if the difference between the height of the convex portion for high-pressure squeezing and the height of the convex portion for low-pressure squeezing is too large, the thickness of the surface sheet pressed by the convex portion for low-pressure squeezing in the low basis weight portion. The difference between the position in the direction and the position in the thickness direction pressed by the adjacent convex portion for high-pressure squeezing may become too large. In that case, the surface sheet is likely to break, or the surface sheet is likely to float from the absorber due to the breakage. In other words, in the portion where the low basis weight portion of the convex portion is squeezed, if the difference in the degree of squeezing between the low-pressure squeezing convex portion and the high-pressure squeezing convex portion is relatively large, the surface sheet may be broken or floated accordingly. It is easy to occur. In such cases, the high-pressure squeezing section or the low-pressure squeezing section may be difficult to perform actions such as blocking, diffusing, and absorbing excrement.

An object of the present invention is to form an squeezed portion by squeezing the surface sheet and the absorber in a method for manufacturing an absorbent article including an absorber having a high basis weight portion and a low basis weight portion and a surface sheet. It is an object of the present invention to provide a method for producing an absorbent article capable of preventing the surface sheet from floating from the absorber or breaking.

The method for producing an absorbent article of the present invention is as follows. (1) A method for manufacturing an absorbent article including an absorber having a high basis weight portion and a low basis weight portion and a surface sheet, the first roll including a convex portion arranged on an outer peripheral surface, and the first roll. A supply in which the surface sheet and the absorber are laminated between the second roll arranged so as to face the first roll is supplied so that the surface sheet faces the first roll. While sandwiching the laminated body between the first roll and the second roll in the step, the laminated body is squeezed from the surface sheet side toward the absorber side by the convex portion, and the high basis weight is increased. A deeply squeezed first high pressure section and a shallowly squeezed first low pressure squeezed section are formed in the section, and a deeply squeezed second high pressure squeezed section and a shallowly squeezed second low pressure squeezed section are formed in the low basis weight section. The convex portion includes a convex portion for high basis weight for squeezing the high basis weight portion and a convex portion for low basis weight for pressing the low basis weight portion, and the high basis weight portion is provided. The convex portion is a first high-pressure squeezing convex portion forming the first high-pressure squeezing portion and a first low-pressure squeezing convex portion adjacent to the first high-pressure squeezing portion and forming the first low-pressure squeezing portion. The low-bath weight convex portion includes a portion, and the second high-pressure squeezing portion is adjacent to a second high-pressure squeezing convex portion forming the second high-pressure squeezing portion and the second high-pressure squeezing portion, and the second low-pressure squeezing portion is formed. The difference between the degree of squeezing by the second high-pressure squeezing convex portion and the degree of squeezing by the second low-pressure squeezing convex portion including the second low-pressure squeezing convex portion to be formed is the first high-pressure squeezing convex portion. A method for producing an absorbent article, which is smaller than the difference between the degree of squeezing by the first low-pressure squeezing portion and the degree of squeezing by the first low-pressure squeezing convex portion.

In the present manufacturing method, by having the above structure, the degree of squeezing of the first high pressure squeezing portion is relatively large and the degree of squeezing of the first low pressure squeezing portion is relatively small in the high basis weight portion. .. Therefore, the convex portion for the first high-pressure squeezing can sufficiently squeeze the absorber (high basis weight portion), and the surface sheet can be prevented from peeling off and floating from the bottom of the first high-pressure squeezing portion. On the other hand, in the low basis weight portion, the degree of squeezing of the second high-pressure squeezing portion is relatively small, and the degree of squeezing of the second low-pressure squeezing portion is relatively large. Therefore, the difference between the degree to which the surface sheet is pressed by the second low-pressure squeezing convex portion and the degree to which the surface sheet is pressed by the second high-pressure squeezing convex portion can be relatively suppressed. Therefore, it is possible to prevent the surface sheet from breaking or floating from the absorber due to the breakage. As a result, the first and second high-pressure squeezing portions and the first and second low-pressure squeezing portions can easily exert actions such as blocking, diffusing, and absorbing excrement. As described above, in the method for manufacturing an absorbent article including an absorber having a high basis weight portion and a low basis weight portion and a surface sheet, when the surface sheet and the absorber are squeezed to form a squeezed portion. , It is possible to prevent the surface sheet from floating or breaking from the absorber.

The method for producing an absorbent article of the present invention is as follows: (2) The height of the second low-pressure squeezing convex portion is the height of the first high-pressure squeezing convex portion and the height of the first low-pressure squeezing convex portion. The difference between the height of the second high-pressure squeezing convex portion and the height of the second low-pressure squeezing convex portion is the height of the first high-pressure squeezing convex portion and the first low-pressure squeezing. The method for producing an absorbent article according to (1) above, which is smaller than the difference from the height of the convex portion, may be used.
In the present manufacturing method, by having the above configuration, in the high basis weight portion, the force applied to the region where the first low pressure squeezed portion is formed is dispersed in the region where the first low pressure squeezed portion is formed. Can be suppressed. Therefore, the convex portion for the first high-pressure squeezing can sufficiently squeeze the absorber (high basis weight portion), and the surface sheet can be prevented from peeling off and floating from the bottom of the first high-pressure squeezing portion. On the other hand, in the low basis weight portion, it is possible to prevent a large difference between the position where the surface sheet is pressed by the second low-pressure squeezing convex portion and the position where the surface sheet is pressed by the first high-pressure squeezing convex portion. Therefore, it is possible to prevent the surface sheet from breaking or floating from the absorber due to the breakage. As a result, the high-pressure squeezing section and the low-pressure squeezing section can easily perform actions such as blocking, diffusing, and absorbing excrement.

In the method for producing an absorbent article of the present invention, (3) the height of the first high-pressure squeezing convex portion is the same as the height of the second high-pressure squeezing convex portion, and the height of the first low-pressure squeezing convex portion is the same. The height of the above-mentioned second low-pressure squeezing convex portion may be lower than the height of the above-mentioned method for producing an absorbent article according to (2).
In the present manufacturing method, in the first and second high-pressure squeezed portions that are relatively deeply squeezed by having the above-mentioned offensive, the depth from the surface of the laminated body on the surface sheet side is made the same for the entire high-pressure squeezed portion. be able to. As a result, the function of the high-pressure squeezing section can be similarly exerted on the entire high-pressure squeezing section in both the high-basis section and the low-basis section while suppressing the breakage and floating of the surface sheet.

The method for producing an absorbent article of the present invention is as follows: (4) In the forming step, the high basis weight continuously adjacent to each other by the high basis weight convex portion and the low basis weight convex portion continuously adjacent to each other. The method for producing an absorbent article according to (2) or (3) above, which comprises a step of pressing the weight portion and the low basis weight portion, respectively, may be used.
In the present production method, by having the above structure, it is possible to prevent the surface sheet from peeling off or floating in each of the continuously formed pressed portions. Thereby, in both the high basis weight portion and the low basis weight portion, the function of each continuously formed pressing portion can be similarly exerted on the entire pressing portion.

In the method for producing an absorbent article of the present invention, (5) the difference between the height of the second low-pressure squeezing convex portion and the height of the second high-pressure squeezing convex portion is the height of the first low-pressure squeezing convex portion. The method for producing an absorbent article according to any one of (2) to (4) above, wherein the difference between the height and the height of the first high-pressure squeezing convex portion is 30% or more and 80% or less. You may.
In the present manufacturing method, by having the above configuration, the position pressed by the second low pressure squeezing convex portion for squeezing the low basis weight portion and the position pressed by the second high pressure squeezing convex portion on the surface sheet are pressed. It is possible to suppress a large difference from the position. Therefore, it is possible to further suppress the breakage / floating of the surface sheet.

In the method for producing an absorbent article of the present invention, (6) the difference between the height of the first low-pressure squeezing convex portion and the height of the first high-pressure squeezing convex portion is the height of the first high-pressure squeezing convex portion. The difference between the height of the second low-pressure squeezing convex portion and the height of the second high-pressure squeezing convex portion is the height of the second high-pressure squeezing convex portion. The method for producing an absorbent article according to any one of (2) to (5) above, which is 1% or more and 20% or less.
In this manufacturing method, by having the above structure, it is possible to further suppress the breakage / floating of the surface sheet. As a result, the first and second high-pressure squeezing portions and the first and second low-pressure squeezing portions can easily exert actions such as blocking, diffusing, and absorbing excrement.

The method for producing an absorbent article of the present invention is as follows: (7) The first roll in the second high pressure squeezing convex portion with respect to the area seen from the radial direction of the first roll in the second low pressure squeezing convex portion. The ratio of the area seen from the radial direction is viewed from the radial direction of the first roll in the first high pressure squeezing convex portion with respect to the area seen from the radial direction of the first roll in the first low pressure squeezing convex portion. The method for producing an absorbent article according to (1) above, which is larger than the ratio of the area to be collected, may be used.
In the present manufacturing method, by having the above configuration, in the high basis weight portion, the pressure applied to the region where the first high pressure squeezed portion is formed is applied to the region where the first low pressure squeezed portion is formed. It can be increased relative to the pressure. Therefore, the convex portion for the first high-pressure squeezing can squeeze the absorber (high basis weight portion) relatively strongly, and the surface sheet can be further suppressed from peeling off and floating from the bottom of the first high-pressure squeezing portion. On the other hand, in the low basis weight portion, the pressure applied to the region where the second high pressure squeezed portion is formed can be made relatively smaller than the pressure applied to the region where the second low pressure squeezed portion is formed. can. Therefore, the second high-pressure squeezing convex portion can relatively press the surface sheet, and the surface sheet can be partially strongly pulled to prevent the surface sheet from breaking or floating from the absorber due to the breakage. As a result, the first and second high-pressure squeezing portions and the first and second low-pressure squeezing portions can easily exert actions such as blocking, diffusing, and absorbing excrement.

The method for producing an absorbent article of the present invention is as follows: (8) In the forming step, the first low-pressure squeezing portion or the first low-pressure squeezing portion or the first low-pressure squeezing portion is formed by at least a part of the first low-pressure squeezing convex portion or the second low-pressure squeezing convex portion. 2 After forming at least a part of the low-pressure squeezing portion, at least a part of the first high-pressure squeezing portion or the second high-pressure squeezing portion and at least a part of the first high-pressure squeezing portion or the second high-pressure squeezing portion. The method for producing an absorbent article according to any one of (1) to (7) above, which comprises a step of forming a part thereof.
In the present manufacturing method, the above-mentioned structure, that is, first, a surface sheet is fixed by forming a first or second low-pressure squeezed portion that is relatively shallowly squeezed, and then a relatively deeply squeezed first. By forming the 1st or 2nd high pressure squeezing portion, the 1st or 2nd high pressure squeezing portion can be formed while suppressing the force (shearing force) acting on the surface sheet. Thereby, when the first or second high-pressure squeezed portion is formed, the surface sheet is partially strongly pulled, and it is possible to further prevent the surface sheet from breaking or floating from the absorber due to the breakage.

The method for producing an absorbent article of the present invention is as follows: (9) The depth of the first high-pressure squeezed portion and the second high-pressure squeezed portion from the surface of the laminated body on the surface sheet side is the first high-pressure squeezed portion. Less than the height of the convex portion and the second high pressure squeezed portion, and / or the depth from the surface of the laminated body on the surface sheet side in the first low pressure squeezed portion and the second low pressure squeezed portion. The method for producing an absorbent article according to any one of (1) to (8) above, which is smaller than the height of the first low-pressure squeezing convex portion and the second low-pressure squeezing portion, may be used. ..
Since the present manufacturing method has the above configuration, it is difficult for the outer peripheral surfaces of the first roll other than the first and second high-pressure squeezing protrusions and / or the first and second low-pressure squeezing protrusions to come into contact with the laminate. can do. Thereby, the pressure for squeezing by the first roll and the second roll in the forming step can be effectively used for the formation of the squeezed portion, and the surface sheet is further suppressed from peeling off from the absorber and floating in each squeezed portion. can.

According to the present invention, in a method for manufacturing an absorbent article including an absorber having a high basis weight portion and a low basis weight portion and a surface sheet, the surface sheet and the absorber are squeezed to form a squeezed portion. When this is done, it is possible to provide a method for producing an absorbent article capable of suppressing the surface sheet from floating from the absorber or breaking.

It is a top view which shows the absorbent article which concerns on embodiment. It is sectional drawing along the line IIa-IIa and the line IIb-IIb of FIG. It is a partially enlarged plan view of the absorbent article of FIG. It is a schematic diagram which shows the structural example of the manufacturing apparatus of the absorbent article which concerns on embodiment. It is a top view which shows the structural example of the convex part of the 1st roll of the squeezing apparatus of FIG. It is a schematic diagram which shows the structural example of the convex part for high basis weight and the convex part for low basis weight of the convex part of FIG. It is a schematic diagram which shows an example of the relationship between the convex part and a semi-finished product in the squeezing apparatus of FIG. It is a schematic diagram which shows the structural example of the convex part of the 1st roll which concerns on other embodiment.

Hereinafter, a method for producing an absorbent article according to the present embodiment will be described with reference to a menstrual napkin as an example of the absorbent article. However, the present invention is not limited to this example, and is applicable to various absorbent articles as long as it does not deviate from the scope of the subject matter of the present invention. Absorbent articles include, for example, panty liners, light incontinence pads, disposable diapers.

First, the configuration of the menstrual napkin 1 according to the present embodiment will be described.
1 to 3 are views showing a configuration example of the menstrual napkin 1 according to the present embodiment. However, FIG. 1 is a plan view of the menstrual napkin 1, FIG. 2A is a cross-sectional view taken along the line IIa-IIa of FIG. 1, and FIG. 2B is a sectional view taken along the line IIb-IIb of FIG. It is a cross-sectional view along the line, and FIG. 3 is a partially enlarged plan view of the absorbent article of FIG. The menstrual napkin 1 has a longitudinal direction L, a width direction W, and a thickness direction T orthogonal to each other, and has a width at a main body portion 1a extending in the longitudinal direction L and a substantially central portion of the longitudinal direction L in the main body portion 1a. A pair of flap portions 1b and 1b extending to both outer sides in the direction W are provided. In FIG. 1, the upper side is the front side (longitudinal direction L) of the menstrual napkin 1, and the lower side is the rear side (longitudinal direction L) of the menstrual napkin 1. The menstrual napkin 1 has a longitudinal center line CL (virtual line) that passes through the center of the width direction W and extends in the longitudinal direction L, and a width direction center line C _W (virtual line) that passes through the center of the longitudinal direction L and extends in the width direction _W. Line). The direction toward the center line CL in the longitudinal direction and the direction away from it are defined as the inner direction and the outer direction of the width direction _W , respectively. The direction toward the center line C _W in the width direction and the direction away from it are defined as the inner direction and the outer direction of the longitudinal direction L, respectively. Looking at the sanitary napkin 1 placed on a plane including the longitudinal direction L and the width direction W from above the thickness direction T is called "planar view", and the shape grasped in the plan view is called "planar shape". .. The "skin side" and "non-skin side" mean the side relatively close to the wearer's skin surface and the side far from the skin surface in the thickness direction T when the menstrual pad 1 is worn. The menstrual napkin 1 is further located on one side (left side of the same) of the longitudinal end portion _EL1 located on the front side in the longitudinal direction _L , the longitudinal end portion EL2 located on the rear side, and the width direction W. It has a widthwise end E _W1 and a widthwise end E _W2 located on the other side (on the right side of the same). These definitions are commonly used for each material of the menstrual napkin 1.

The main body portion 1a has a vertically long shape in the longitudinal direction L. Examples of the vertically elongated shape include a rectangular shape with rounded corners, an ellipse shape, an oval shape, an hourglass shape, or a shape similar thereto. The edges of both ends of the main body 1a in the longitudinal direction _L , that is, the longitudinal end EL1 and the longitudinal end _EL2 have a substantially semicircular or bowl-shaped shape. The flap portion 1b has a shape extending to both outer sides of the main body portion 1a in the width direction W. Examples of the extending shape include a semicircular shape, a semi-elliptical shape, a trapezoidal shape, or a shape similar thereto.

The main body 1a is a liquid-permeable front sheet 2 constituting the skin-side surface F1 of the menstrual napkin ₁ and a liquid-impermeable back sheet ₂ constituting the non-skin-side surface F2 of the sanitary napkin 1. 3 and a liquid-absorbing and liquid-retaining absorber 4 arranged between the front surface sheet 2 and the back surface sheet 3. The absorber 4 may include an absorbent core and a core wrap covering the absorbent core, and a plurality of absorbers or a plurality of absorbent cores may be laminated. In the main body 1a, the non-skin side surface of the front surface sheet 2 and the skin side surface of the absorber 4 are joined by an adhesive or the like, and the non-skin side surface of the absorber 4 and the skin side surface of the back surface sheet 3 are joined. Is bonded with an adhesive or the like, and the edge of the non-skin side surface of the front surface sheet 2 and the edge of the skin side surface of the back surface sheet 3 are bonded with an adhesive. In the flap portion 1b, the edge of the non-skin side surface of the front surface sheet 2 and the edge of the skin side surface of the back surface sheet 3 are bonded with an adhesive.

A region that abuts on the wearer's excretion port at the time of wearing, that is, an excretion port contact area XA is set in a region where the surface sheet 2 and the absorber 4 of the main body 1a overlap each other in the thickness direction T. The excretion opening contact area XA is, for example, approximately 1/4 to 1/2 of the total length of the absorber 4 in the center of the width direction W slightly forward in the longitudinal direction L of the absorber 4. 4 The width is set to about 1/2 to 1/3 of the total width. The menstrual napkin 1 has an anterior region _AF , a central region _AC , and a posterior region _AB between the longitudinal end _EL1 and the longitudinal end _EL2 . The central region _AC includes the excretion opening contact region XA. The anterior region A _F is adjacent to the anterior side of the central region A _C in the longitudinal direction L and includes the anterior end of the excretory opening contact region XA in the longitudinal direction L. The posterior region A _B is adjacent to the posterior side of the central region A _C in the longitudinal direction L and includes the posterior end of the excretory opening contact region XA in the longitudinal direction L.

The absorber 4 is included in the front surface sheet 2 and the back surface sheet 3 of the main body portion 1a, and has a vertically long shape in the longitudinal direction L, which is slightly smaller than the main body portion 1a. Examples of the vertically elongated shape include a rectangular shape with rounded corners, an ellipse shape, an oval shape, an hourglass shape, or a shape similar thereto. The absorber 4 has a high basis weight portion HB having a relatively high basis weight and a low basis weight portion LB having a relatively low basis weight, and in the present embodiment, the high basis weight portions HB1 to HB4. , Has low basis weight portions LB1 to LB4. The low basis weight portion LB1 is arranged so as to extend in the width direction W with a predetermined width in the front region _AF in the vicinity of the boundary between the front region _AF and the central region _AC . In the present embodiment, the absorber 4 is arranged over the entire width direction W. The low basis weight portions LB2 and LB2 are arranged so as to extend in the width direction W with a predetermined width on both sides excluding the central portion in the width direction W in the central region _AC , respectively. The low basis weight portions LB3 and LB3 extend in the width direction W with a predetermined width on both sides of the central region _AC excluding the central portion in the width direction W, respectively, and the low basis weight portions LB2 and LB2 in the longitudinal direction L. It is arranged at a space behind. In the present embodiment, the low basis weight portions LB2, LB2, LB3, and LB3 are arranged so as to reach the end portion of the absorber 4 in the width direction W, respectively. The low basis weight portion LB4 has a low basis weight portion LB4a arranged so as to extend in the longitudinal direction L with a predetermined width in the central portion in the width direction W of the rear region _AB , and the rear region _AB in the longitudinal direction L. In the substantially central portion of the above, a low basis weight portion LB4b extending in the width direction W with a predetermined width and arranged so as to intersect the low basis weight portion LB4a is included. The low basis weight portion LB is a portion in which the basis weight of a liquid-absorbing and liquid-retaining absorbent material, for example, a hydrophilic fiber or a highly absorbent polymer, constituting the absorber 4 is relatively low, and is a high basis weight portion. HB is a portion where the basis weight of the absorbent material constituting the absorber 4 is relatively high. Therefore, the portion (position) of the absorber 4 in the sanitary napkin 1 corresponding to the low basis weight portion LB has lower rigidity than the portion (position) corresponding to the high basis weight portion HB, so that it is relatively easy to bend. be. As a result, the excretion opening contact area XA of the absorber 4 can be easily deformed into a shape that is pressed against the wearer's skin at the time of wearing. Then, the fit of the menstrual napkin 1 can be improved, a comfortable wearing feeling can be given to the wearer, and leakage of menstrual blood can be effectively suppressed.

The main body portion 1a includes a squeezing portion, for example, a squeezing portion is provided around the excretion opening contact area XA. In the present embodiment, the main body 1a includes a squeezing section 5, a pair of squeezing sections 7, 7, a pair of squeezing sections 8, 8, and a squeezing section 6. Each squeezed portion is formed by squeezing the surface sheet 2 and the absorber 4 from the skin side to the non-skin side, that is, from the surface sheet 2 side to the absorber 4 side. Therefore, each squeezed portion has a shape in which the surface sheet 2 and the absorber 4 are recessed from the surface sheet 2 side to the absorber 4 side, and at least the surface sheet 2 and the absorber 4 are joined to each other.

The squeezing portion 5 is arranged on the front outer side in the longitudinal direction L in the excretion opening contact area XA. In other words, the squeezing portion 5 is arranged in the central portion of the anterior region _AF in the longitudinal direction L and is located in the central portion of the anterior region _AF in the width direction W. In this embodiment, the squeezed portion 5 has a closed curved shape such as a heart shape. The pair of squeezed portions 7 and 7 are arranged along the longitudinal direction L at both ends of the width direction W in the portion from the front to the center of the excretion opening contact area XA in the longitudinal direction L. In other words, the pair of squeezed portions 7, 7 are arranged in the longitudinal direction L from the rear end in the anterior region _AF to the central portion in the central region _AC , and in the width direction W, the excretion opening contact. It is arranged along both ends of the region XA. In the present embodiment, each squeezed portion 7 has a curved shape like a gentle wave shape, and the pair of squeezed portions 7, 7 are line- _symmetrical with respect to the longitudinal center line CL. The pair of squeezed portions 8 and 8 are arranged along the longitudinal direction L at both ends of the width direction W in the portion rearward of the longitudinal direction L in the excretion opening contact area XA. In other words, the pair of squeezed portions 8 and 8 are arranged in the posterior portion in the central region _AC in the longitudinal direction L and along both ends of the excretion opening contact region XA in the width direction W. .. In the present embodiment, each squeezed portion 8 has a curved shape like a gentle wave shape, and the pair of squeezed portions 8 and 8 are line- _symmetrical with respect to the longitudinal center line CL. The squeezing portion 6 is arranged on the rear outer side in the longitudinal direction L in the excretion opening contact area XA. In other words, the squeezing portion 5 is arranged in the central portion of the rear region _AB in the longitudinal direction L and in the central portion of the posterior region _AB in the width direction W. In this embodiment, the squeezed portion 6 has a closed curved shape such as a heart shape. The squeezing portion 5, the pair of squeezing portions 7, 7 and the pair of squeezing portions 8 and 8 and the squeezing portion 6 are arranged so as to surround the excretion opening contact area XA. Each squeezing portion controls the diffusion of the excrement liquid excreted in the excretion port contact area XA in the longitudinal direction L, the width direction W, and the thickness direction T. Further, at least the pair of squeezed portions 7 and 7 and the pair of squeezed portions 8 and 8 form a polygonal line, and the shape of the absorber 4 is deformed so that the excretion port contact area XA is pressed against the wearer's skin at the time of wearing. obtain.

Each of the squeezing section 5, the pair of squeezing sections 7, 7, the pair of squeezing sections 8, 8 and the squeezing section 6 has a high basis weight pressing section formed at a position corresponding to the high basis weight section HB and a low basis weight. A low basis weight squeezing portion formed at a position corresponding to the portion LB is provided. However, the position corresponding to the high basis weight portion HB is a position where the high basis weight portion HB of the absorber 4 in the laminated body of the surface sheet 2 and the absorber 4 overlaps in the thickness direction T in a plan view. Similarly, the position corresponding to the low basis weight portion LB is the position where the low basis weight portion LB of the absorber 4 in the laminated body of the surface sheet 2 and the absorber 4 overlaps in the thickness direction T in a plan view. ..

In the present embodiment, the squeezing section 5 includes a high basis weight squeezing section 5b. The high basis weight pressing portion 5b is formed at a position corresponding to the high basis weight portion HB1. Each of the pair of pressing portions 7 and 7 includes high basis weight pressing portions 7b1 and 7b2 and low basis weight pressing portions 7a1 and 7a2. In each pressing section 7, the low basis weight pressing section 7a1, the high basis weight pressing section 7b1, the low basis weight pressing section 7a2, and the high basis weight pressing section 7b2 are arranged in this order from the front in the longitudinal direction L. The high basis weight pressing portions 7b1 and 7b2 are formed at positions corresponding to the high basis weight portions HB2, and the low basis weight pressing portions 7a1 and 7a2 are formed at positions corresponding to the low basis weight portions LB1 and LB2, respectively. Each of the pair of pressing portions 8 and 8 includes a high basis weight pressing unit 8b and a low basis weight pressing unit 8a. In each squeezing section 8, the low basis weight squeezing section 8a and the high basis weight squeezing section 8b are arranged in this order from the front in the longitudinal direction L. The high basis weight pressing portion 8b is formed at a position corresponding to the high basis weight portion HB2, and the low basis weight pressing portion 8a is formed at a position corresponding to the low basis weight portion LB3. The squeezing section 6 includes high basis weight squeezing sections 6b1, 6b2, 6b3, 6b4 and low basis weight squeezing sections 6a1, 6a2, 6a3, 6a4. In the pressing section 6, the low basis weight pressing section 6a1, the high basis weight pressing section 6b1, the low basis weight pressing section 6a2, the high basis weight pressing section 6b2, the low basis weight pressing section 6a3, the high basis weight pressing section 6b3, and the low basis weight. The squeezing section 6a4 and the high basis weight squeezing section 6b4 are arranged in this order. The low basis weight pressing portions 6a1, 6a2, 6a3, and 6a4 are formed at positions corresponding to the low basis weight portions LB4 (mainly LB4a), LB4 (LB4b), LB4 (mainly LB4a), and LB4 (LB4b), respectively. The basis weight pressing portions 6b1, 6b2, 6b3, and 6b4 are formed at positions corresponding to the high basis weight portions HB2, HB4, HB3, and HB2, respectively.

Each low basis weight squeezing section includes a second high-pressure squeezing section and a second low-pressure squeezing section adjacent to the second high-pressure squeezing section and recessed shallower than the second high-pressure squeezing section. In the present embodiment, each of the low basis weight pressing portions 7a1, 7a2, 8a, 6a1, 6a2, 6a3, and 6a4 is adjacent to the second high pressure pressing portion 21a and the second high pressure pressing portion 21a, and is adjacent to the second high pressure pressing portion 21a. A second low-pressure squeezing portion 22a, which is shallower than the surface sheet 2 than the portion 21a, is included. For example, on behalf of the low basis weight pressing section, the low basis weight pressing section 6a3 of the low basis weight section LB4a shown in FIGS. 2 (a) and 3 will be described. The low basis weight squeezing portion 6a3 is adjacent to the second high pressure squeezing portion 21a formed in a substantially circular shape and the second high pressure squeezing portion 21a, is recessed shallower than the second high pressure squeezing portion 21a, and is formed in a substantially band shape. 2 Includes low pressure squeezing section 22a. The second high pressure squeezing portion 21a includes a bottom portion 21aBT and a side wall portion 21aSW, and the second low pressure squeezing portion 22a includes a bottom portion 22aBT and a side wall portion 22aSW.

Here, the height Ua2 of the bottom portion 22aBT of the second low-pressure squeezing portion 22a is the height in the thickness direction T from the surface F3 on the skin side of the back surface sheet ₃ . Further, the height Ua1 of the bottom portion 21aBT of the second high-pressure squeezing portion 21a is the height in the thickness direction T from the front surface F3 of the back surface sheet ₃ . The difference between the height Ua2 and the height Ua1 is ΔUa. The thickness of the low basis weight portion LB is Ta. It can be said that the bottom portion 21aBT of the second high-pressure squeezing portion 21a, the bottom portion 22aBT of the second low-pressure squeezing portion 22a, and the portion below the bottom portion 21aBT are high-density portions in which the fibers of the absorber 4 are squeezed at high density. In the present embodiment, for example, the height Ua2 of the bottom portion 22aBT of the second low-pressure squeezing portion 22a is 350 to 10000 μm, and the height Ua1 of the bottom portion 21aBT of the second high-pressure squeezing portion 21a is 100 to 9000 μm. The difference ΔUa between the height Ua2 and the height Ua1 is, for example, 250 to 1000 μm. The thickness Ta of the low basis weight portion LB is, for example, 0.8 to 19 mm.

In the present embodiment, the absorber 4 further has a recess formed on the non-skin side of the low basis weight squeezed portion so that the surface on the non-skin side is recessed toward the skin side, and the low basis weight is obtained. It has a second recess 23a on the non-skin side of the squeezed portion 6a3. The second recess 23a is formed so as to overlap the second high-pressure squeezing portion 21a and the second low-pressure squeezing portion 22a in a plan view. In the thickness direction T, the distance ΔVa between the bottom portion 21aBT of the second high-pressure squeezing portion 21a and the bottom portion of the second recess 23a facing the bottom portion 21aBT is a second facing the bottom portion 22aBT and the bottom portion 22aBT of the second low-pressure squeezing portion 22a. It is smaller than the distance from the bottom of the recess 23a. Further, in the thickness direction T, the depth (Ta-Ua1) from the non-skin side surface of the surface sheet 2 in the bottom portion 21aBT of the second high-pressure squeezing portion 21a is the bottom portion of the second recess 23a facing the bottom portion 21aBT. It may be larger or smaller than the height Va from the surface F3 on the skin side of the back sheet ₃ . The degree to which the surface sheet 2 is pushed into the absorber 4 in the low basis weight squeezed portion by the second recess 23a, and the degree to which the surface sheet 2 is pushed into the inside of the absorber 4 during squeezing (manufacturing). It can be made smaller than the above, and the surface sheet 2 can be prevented from peeling off from the absorber 4.

Each high basis weight squeezing section includes a first high-pressure squeezing section and a first low-pressure squeezing section adjacent to the first high-pressure squeezing section and recessed shallower than the first high-pressure squeezing section. In the present embodiment, each of the high basis weight pressing portions 7b1, 7b2, 8b, 6b1, 6b2, 6b3, and 6b4 is adjacent to the first high pressure pressing portion 21b and the first high pressure pressing portion 21b, and is adjacent to the first high pressure pressing portion 21b. A first low-pressure squeezing portion 22b, which is shallower than the surface sheet 2 than the portion 21b, is included. For example, on behalf of the high basis weight pressing section, the high basis weight pressing section 6b3 of the high basis weight section HB3 shown in FIGS. 2 (b) and 3 will be described. The high basis weight squeezing portion 6b3 is adjacent to the first high-pressure squeezing portion 21b formed in a substantially circular shape and the first high-pressure squeezing portion 21b, is recessed shallower than the first high-pressure squeezing portion 21b, and is formed in a substantially band shape. 1 Includes low pressure squeezing section 22b. The first high pressure squeezing portion 21b includes a bottom portion 21bBT and a side wall portion 21bSW, and the first low pressure squeezing portion 22b includes a bottom portion 22bBT and a side wall portion 22bSW.

In the present embodiment, the absorber 4 further has a recess formed on the non-skin side of the high basis weight pressing portion so that the surface on the non-skin side is recessed toward the skin side, and the high basis weight is obtained. It has a first recess 23b on the non-skin side of the squeezed portion 6b3. The first recess 23b is formed so as to overlap the first high-pressure squeezing portion 21b and the first low-pressure squeezing portion 22b in a plan view. In the thickness direction T, the distance ΔVb between the bottom portion 21bBT of the first high-pressure squeezing portion 21b and the bottom of the first recess 23b facing the bottom portion 21bBT is the first that faces the bottom portion 22bBT and the bottom portion 22bBT of the first low-pressure squeezing portion 22b. It is smaller than the distance from the bottom of the recess 23b. Further, in the thickness direction T, the depth (Tb-Ub1) from the non-skin side surface of the surface sheet 2 in the bottom portion 21bBT of the first high-pressure squeezing portion 21b is the bottom portion of the first recess 23b facing the bottom portion 21bBT. The height Vb from the surface F3 on the skin side of the back sheet ₃ may be larger or smaller than the height Vb. The degree to which the surface sheet 2 is pushed into the absorber 4 in the high basis weight squeezed portion by the first recess 23b, and the degree to which the surface sheet 2 is pushed into the inside of the absorber 4 during squeezing (manufacturing). It can be made smaller than the above, and the surface sheet 2 can be prevented from peeling off from the absorber 4.

Here, the height Ua1 from the skin side surface F3 of the back surface sheet ₃ of the bottom portion 21aBT of the second low pressure squeezing portion 21a and the height from the surface F3 of the back surface sheet ₃ of the bottom portion 22aBT of the second low pressure squeezing portion 22a. The difference ΔUa from Ua2 is the height Ub1 from the front surface F3 of the back surface sheet ₃ of the bottom portion 21bBT of the first high pressure squeezing portion 21b and the height from the surface F3 of the back surface sheet ₃ of the bottom portion 22bBT of the first low pressure squeezing portion 22b. The difference from Ub2 is smaller than ΔUb. Therefore, ΔUa <ΔUb. That is, in the low basis weight portion LB, the distance between the bottom portion 21aBT of the second high-pressure squeezing portion 21a and the bottom portion 22aBT of the second low-pressure squeezing portion 22a is relatively small. In the present embodiment, for example, (ΔUb−ΔUa) is 100 to 1000 μm.

In the present embodiment, as a preferred embodiment, the distance ΔVb between the bottom portion 21bBT of the first high-pressure squeezing portion 21b and the bottom of the first recess 23b facing the bottom portion 21bBT of the first high-pressure squeezing portion 21b is the second high-pressure squeezing portion 21a. The distance between the bottom portion 21aBT and the bottom portion of the second recess 23a facing the bottom portion 21aBT of the second high-pressure squeezing portion 21a is the same as ΔVa. However, the same means that one value is within ± 10% of the other value. That is, the thickness ΔVb of the absorber 4 below the bottom 21bBT of the first high-pressure squeezing portion 21b formed relatively deeply, and the thickness ΔVa of the absorber 4 below the bottom 21aBT of the second high-pressure squeezing portion 21a. And are aligned as a whole. In other words, of the first and second low-pressure squeezing portions 22b and 22a formed relatively shallowly, the first one facing the bottom portion 22bBT of the first low-pressure squeezing portion 22b and the bottom portion 22bBT of the first low-pressure squeezing portion 22b. The distance from the bottom of the recess 23b is larger than the distance between the bottom 22aBT of the second low pressure squeezing portion 22a and the bottom of the second recess 23a facing the bottom 22aBT of the second low pressure squeezing portion 22a. In the present embodiment, for example, (ΔVb−ΔVa) is generally 0 to 50 μm, and (distance between the bottom of the first low pressure squeezing portion 22b and the bottom of the first recess – the second low pressure squeezing portion 22a). The distance between the bottom and the bottom of the second recess) is approximately 200 to 2000 μm.

The shape and size of the first high-pressure squeezing portion 21b and the second high-pressure squeezing portion 21a in a plan view, that is, the shape and size of the bottom portion 21bBT and the bottom portion 21aBT in a plan view are not particularly limited. Examples of these shapes include a circle, an ellipse, a polygon, a star, and the like, and are circular in the present embodiment. Further, for example, in the case of a circular shape, the diameter thereof is 0.5 to 3 mm, and preferably 1 to 2 mm from the viewpoint of improving absorption performance and reducing hardness. The bottom portion 21bBT of the first high-pressure squeezing portion 21b is formed at a position separated by a predetermined depth in the thickness direction T from the skin-side surface of the absorber 4. Examples of the predetermined depth include 50% or more and less than 100% of the thickness Tb of the high basis weight portion HB of the absorber 4. The bottom portion 21aBT of the second high-pressure squeezing portion 21a is formed at a position separated by a predetermined depth in the thickness direction T from the skin-side surface of the absorber 4. Examples of the predetermined depth include 50% or more and 100% or less of the thickness Ta of the low basis weight portion LB of the absorber 4.

The shape and size of the first low-pressure squeezing section 22b and the second low-pressure squeezing section 22a in a plan view, that is, the shape and size of the bottom portion 22bBT and the bottom portion 22aBT in a plan view are the first high-pressure squeezing section 21b and the second high-pressure squeezing section, respectively. As long as the portion 21a is included, the present invention is not particularly limited. Examples of these shapes include a curved line, a straight line, a band shape of a combination thereof, a circular shape, an elliptical shape, a polygonal shape, a star shape, and the like. It is a gentle curve type. Further, for example, in the case of a band type, the width thereof is preferably 0.5 to 4 mm, and preferably 1 to 3 mm from the viewpoint of improving absorption performance and reducing hardness. The bottom portion 22bBT of the first low-pressure squeezing portion 22b is formed at a position separated by a predetermined depth in the thickness direction T from the skin-side surface of the absorber 4. Examples of the predetermined depth include 30% or more and 80% or less of the thickness Tb of the high basis weight portion HB of the absorber 4. The bottom portion 22aBT of the second low-pressure squeezing portion 22a is formed at a position separated by a predetermined depth in the thickness direction T from the skin-side surface of the absorber 4. Examples of the predetermined depth include 40% or more and 90% or less of the thickness Ta of the low basis weight portion LB of the absorber 4.

In addition, each high basis weight part, each low basis weight part, each pressing part (each high basis weight pressing part and each low basis weight pressing part, each first high pressure pressing part, each second high pressure pressing part, each described above. The number, position, and shape of the first low-pressure squeezing section and each second low-pressure squeezing section) are examples, and the present invention is not limited to these examples.

Further, due to manufacturing reasons, the timing of transporting the absorber 4 and the timing of pressing for forming the pressing portions 5 to 8 may be slightly different from each other. In that case, in the vicinity of the boundary between the low basis weight portion LB and the high basis weight portion HB in the absorber 4, a high basis weight squeezing portion is formed in the low basis weight portion LB, or a low basis area is formed in the high basis weight portion HB. A volume squeezed part is formed. In that case, the high basis weight portion HB has a portion of the low basis weight pressing portion and the absorber 4 becomes hard, or the low basis weight portion LB has a portion of the high basis weight pressing portion and the surface sheet 2 is the absorber. It is possible to float from 4. However, even if a high basis weight pressing section is formed in the low basis weight portion LB or a low basis weight pressing section is formed in the high basis weight portion HB in a part near the boundary, the low basis weight pressing portion is formed next to it. Since the optimum squeezing portion is provided for each basis weight and connected to each other, it is possible to prevent the absorber 4 from becoming hard and the surface sheet 2 from floating from the absorber 4, as in the case where there is no deviation. It can be effective.

The main body 1a and the pair of flaps 1b and 1b of the menstrual pad 1 are provided with a plurality of fixing portions (not shown) for fixing the menstrual pad 1 to the clothes on the skin surface side of the back sheet 3. The plurality of fixing portions are covered with a release sheet (not shown). The plurality of fixing portions of the main body portion 1a have a shape extending in a strip shape in the longitudinal direction L of the menstrual pad 1, for example, and are arranged at predetermined intervals in the width direction W of the menstrual pad 1. The fixing portion of the flap portion 1b has a shape extending in a strip shape in the longitudinal direction L of the sanitary napkin 1, for example. The menstrual napkin 1 may further include an auxiliary sheet (not shown) that assists the diffusion of the liquid between the surface sheet 2 and the absorber 4.

As the material of the front surface sheet 2, the absorber 4, the back surface sheet 3, the auxiliary sheet, the fixing portion, and the release sheet, known materials generally available for the menstrual napkin 1 can be used. Examples of the material of the surface sheet 2 include a non-woven fabric, a woven fabric, a synthetic resin film having liquid permeation holes formed therein, and a composite sheet thereof. Examples of the non-woven fabric include natural fibers, regenerated fibers, inorganic fibers, synthetic resin fibers and the like. Examples of the basis weight of the surface sheet 2 include 5 g / m ² to 100 g / m ² , and 20 g / m ² to 50 g / m ² is preferable. Examples of the thickness of the surface sheet 2 include 0.2 to 5 mm. Examples of the material of the absorber 4 include water-absorbent fibers such as pulp fibers and synthetic fibers, and highly absorbent polymers (SAP). Examples of the basis weight of the fibers of the absorber 4 include 5 to 1000 g / m ² . Of these, the basis weight of the high basis weight portion HB is, for example, 150 to 1000 g / m ² , and is preferably 300 to 600 g / m ² from the viewpoint of absorbability and wearability. On the other hand, the basis weight of the low basis weight portion LB is, for example, 50 to 300 g / m ² , and is preferably 50 to 150 g / m ² from the viewpoint of absorbability and deformability. The basis weight of the highly absorbent polymer is, for example, 0 to 500 g / m ² , preferably 10 to 400 g / m ² . The thickness of the absorber 4 is, for example, 1 to 50 mm, and is preferably 5 to 30 mm. When the absorber 4 includes an absorbent core and a core wrap, the material of the absorbent core includes water-absorbent fibers and a highly absorbent polymer, and the material of the core wrap is a liquid-permeable hydrophilic material such as tissue. Fiber is mentioned. Examples of the material of the back sheet 3 include a waterproof non-woven fabric, a synthetic resin film, a composite sheet of a non-woven fabric and a synthetic resin film, an SMS non-woven fabric, and the like. Examples of the material of the auxiliary sheet include non-woven fabric, pulp fiber, and synthetic fiber. Examples of the material of the fixing portion include a pressure-sensitive adhesive such as a styrene-butadiene copolymer. Examples of the material of the release sheet include a base material of paper or a resin sheet coated with a silicone resin-based release material. As the adhesive for joining between the materials, a known material that can be used in the menstrual napkin 1 can be used, and examples thereof include a hot melt adhesive.

As another embodiment, in the absorber 4 of the menstrual napkin 1, the bulk of the central portion of the longitudinal direction L and the width direction W is compared with the portions at both ends of the longitudinal direction L and the portions on both sides of the width direction W. It may be expensive. That is, the absorber 4 has a structure in which the bulk of the central portion in the longitudinal direction L and the width direction W is higher than that in the portions at both ends in the longitudinal direction L and the portions on both sides in the width direction W, that is, a medium-high structure. May be good. However, in the absorber 4, only the bulk of the central portion in the longitudinal direction L may be higher than that of both ends of the longitudinal direction L, and only the bulk of the central portion in the width direction W is the bulk of the width direction W. It may be higher than the parts on both sides. Examples of the method for forming such a medium-high structure include a method in which the basis weight of the central portion of the absorber 4 is higher than the basis weight of the peripheral portion thereof, and a method of forming the portion around the central portion of the absorber 4. Examples thereof include a method of squeezing (embossing) and a method of providing a cushion sheet or another absorber in the central portion of the absorber 4. As a result, the excretion port contact area XA can be reliably in contact with the excretion port.

Next, a method for producing the menstrual napkin 1 according to the present embodiment will be described. FIG. 4 is a schematic diagram showing a configuration example of the manufacturing apparatus 300 for the menstrual napkin 1. The manufacturing apparatus 300 for the menstrual napkin 1 includes a first unit 300A, a second unit 300B, a third unit 300C, and a fourth unit 300D. The method for producing a menstrual napkin 1 includes a first step to a fourth forming step. In this example, each material is formed and transported so that the longitudinal direction L of the menstrual napkin 1 is the transport direction MD. However, each material may be formed and transported so that the width direction W of the menstrual napkin 1 is the transport direction MD.

The first step is carried out in the first unit 300A. The first unit 300A includes a fiber stacking device 110, a transport belt 115, a suction device 116, a coating device 301, a coating device 302, a pressing device 120, and a cutting device 130. The fiber stacking device 110 includes a material feeder 113 and a rotary drum 111 having a pattern plate 112 and including a negative pressure chamber 111N and a positive pressure chamber 111P.

In the first step, first, the rotary drum 111 is rotated, and the fiber stacking material supplied from the material feeder 113 is deposited in the groove communicating with the negative pressure chamber 111N of the pattern plate 112, and the fiber stack is deposited in the groove. AB is formed. Here, the groove of the pattern plate 112 is formed with a deep groove, that is, a groove for forming a high basis weight portion HB, and a shallow groove, that is, a groove for forming a low basis weight portion LB. Then, the fiber stacking material is deposited in a deep groove to form a high basis weight portion, and is deposited in a shallow groove to form a low basis weight portion. Next, when the pattern plate 112 reaches the positive pressure chamber 111P together with the fiber stack AB, the fiber stack AB is separated from the pattern plate 112. On the other hand, the continuous sheet-shaped upper tissue sheet UT is supplied from the roll WR1 to the transport belt 115. A hot melt adhesive is applied to one surface of the upper tissue sheet UT by the coating device 301. Then, the fiber stack AB is pressed onto one surface of the upper tissue sheet UT on the transport belt 115. As a result, the first semi-finished product P1 in which the fiber stack AB and the upper tissue sheet UT are laminated is formed. The first semi-finished product P1 is conveyed by the transfer belt 115 while being sucked by the suction device 116.

Next, the continuous sheet-shaped lower tissue sheet LT is supplied from the roll WR2 to the transport belt 115. A hot melt adhesive is applied to one surface of the lower tissue sheet LT by the coating device 302. One surface of the lower tissue sheet LT is pressed against the first semi-finished product P1 on the transport belt 115. As a result, the second semi-finished product P2 in which the lower layer tissue sheet LT and the first semi-finished product P1 (the fiber stack AB and the upper layer tissue sheet UT) are laminated is formed. Next, the second semi-finished product P2 is pressed by the pressing device 120 and cut into the shape of the absorber 4 by the cutting device 130. As a result, the third semi-finished product P3 is formed. The third semi-finished product P3 is substantially an absorber 4 (however, there is no high basis weight pressing part / low basis weight pressing part), the fiber stack AB is an absorbent core, and the upper / lower layer tissue sheet UT.・ LT is the core wrap. The third semi-finished product P3 is delivered to the transport roll 141.

Next, the second step is carried out in the second unit 300B. The second unit 300B includes a transport roll 141, a transport belt 140, and a coating device 303. In the second step, the continuous sheet-shaped surface sheet TS is supplied from the roll WR3 to the transport belt 140. The hot melt adhesive is applied to one surface of the surface sheet TS by the coating device 303. The third semi-finished product P3 supplied from the transport roll 141 is pressed against one surface of the surface sheet TS. As a result, the fourth semi-finished product P4, which is a laminated body in which the third semi-finished product P3 (absorbent body 4) and the surface sheet TS are laminated, is formed. The fourth semi-finished product P4 is supplied to the squeezing device 150 by the transport belt 140.

Next, the third step is carried out in the third unit 300C. The third unit 300C comprises a squeezing device 150 having a pair of first rolls 151 and a second roll 152. In the third step, the fourth semi-finished product P4 is sandwiched and squeezed by the pair of first rolls 151 and the second roll 152 of the squeezing device 150, and the plurality of squeezing portions 5 to 8 described by FIGS. 1 to 3 are formed. Formed at the same time. As a result, the fifth semi-finished product P5 having a plurality of pressing portions 5 to 8 is formed. At this time, by controlling the tension of the surface sheet TS and the basis weight of the surface sheet TS and the hot melt adhesive, the first recess 23b is formed on the surface of the fifth semi-finished product P5 opposite to the pressed portions 5 to 8. And the second recess 23a is formed. The fifth semi-finished product P5 is delivered to the transport roll 160. In addition, a squeezing device different from the squeezing device 150 may be further provided, and a plurality of squeezing portions 5 and 6 may be formed by, for example, the squeezing device 150, and the squeezing portions 7 and 8 may be formed by another squeezing device.

However, in the step of supplying the fourth semi-finished product P4 to the squeezing device 150, the surface sheet TS and the absorber 4 (third semi-finished product P3) are placed in the squeezing device 150 (the gap between the pair of first rolls 151 and the second roll 152). ) And the laminated body (fourth semi-finished product P4) can be seen as a supply process in which the surface sheet TS is supplied so as to face the first roll 151. Further, the step of squeezing the fourth semi-finished product P4 with the pair of first rolls 151 and the second roll 152 of the squeezing device 150 to form a plurality of squeezed portions 5 to 8 is at a position corresponding to the high basis weight portion HB. It can be seen as a forming step of forming the first high-pressure squeezing section 21b and the first low-pressure squeezing section 22b, and forming the second high-pressure squeezing section 21a and the second low-pressure squeezing section 22a at positions corresponding to the low basis weight section LB. ..

Here, the squeezing device 150 will be described. The pair of first rolls 151 and second rolls 152 of the squeezing device 150 are rolls that are arranged facing each other and rotate in opposite directions. The rotation direction of the first roll 151 is S1, and the rotation direction of the second roll 152 is S2. The first roll 151 includes a convex portion arranged on the outer peripheral surface. The second roll 152 has a smooth outer peripheral surface. The squeezing device 150 squeezes a plurality of the third semi-finished product P3 (absorbent body 4) supplied between the first roll 151 and the second roll 152 and the fourth semi-finished product P4 which is a laminate of the surface sheet TS. Parts 5 to 8 are formed. Hereinafter, the description will be further described.

5 to 6 are views showing a configuration example of the convex portion 31 of the first roll 151 of the squeezing device 150. However, FIG. 5 is a diagram showing a configuration example in which the pattern of the convex portion 31 of the first roll 151 is developed in a plane. FIG. 6A is a cross-sectional view of the convex portion 31 along the VIa-VIa line of FIG. FIG. 6B is a cross-sectional view of the convex portion 31 along the VIb-VIb line of FIG. Further, FIG. 6 (c) is a partial side view of the convex portion 31 as seen from the VIa-VIa line direction. FIG. 6B is a partial side view of the convex portion 31 as seen from the VIb-VIb line.

As shown in FIG. 5, on the outer peripheral surface of the first roll 151, as a convex portion 31, a convex convex portion 35 standing substantially perpendicular to the outer peripheral surface, a pair of convex portions 37, 37, and a pair of convex portions are formed. The portions 38, 38, and the convex portion 36 are formed. The convex portion 35, the pair of convex portions 37, 37, the pair of convex portions 38, 38, and the convex portion 36 are the squeezing portion 5, the pair of squeezing portions 7, 7, the pair of squeezing portions 8, 8, and the squeezing portion, respectively. It has a shape corresponding to 6 and is arranged at a position corresponding to those squeezed portions on the outer peripheral surface of the first roll 151 in order to form those squeezed portions. Therefore, the shape of each convex portion viewed from the radial direction of the first roll 151 is substantially the same as the shape of the corresponding squeezed portion in a plan view (however, mirror image symmetry). In the present embodiment, the convex portions 35 to 38 are arranged on the outer peripheral surface so that the direction from the convex portion 35 toward the convex portion 36 is along the peripheral surface direction (rotational direction S1) of the first roll 151. ing. However, the convex portions 35 to 38 may be arranged on the outer peripheral surface so that the direction from the convex portion 35 toward the convex portion 36 is a direction perpendicular to the peripheral surface direction.

The convex portion 35 is a convex portion for the pressing portion 5. The convex portion 35 includes a high basis weight convex portion 35b for forming the high basis weight pressing portion 5b, that is, for pressing the high basis weight portion HB. In the present embodiment, the convex portion 35 has a closed curved shape such as a heart shape corresponding to the shape of the squeezed portion 5. The pair of convex portions 37, 37 are convex portions for the pair of pressing portions 7, 7. Each of the pair of convex portions 37, 37 has a high basis weight convex portion 37b1, 37b2 for forming the high basis weight pressing portions 7b1 and 7b2, that is, for pressing the high basis weight portion HB, and a low basis weight. It is provided with convex portions 37a1 and 37a2 for low basis weight for forming the pressing portions 7a1 and 7a2, that is, for pressing the low basis weight portion LB. In each convex portion 37, the convex portion 37a1 for low basis weight, the convex portion 37b1 for high basis weight, the convex portion 37a2 for low basis weight and the convex portion 37b2 for high basis weight are formed in the direction from the convex portion 35 toward the convex portion 36. , Arranged in this order. In the present embodiment, each convex portion 37 has a curved shape like a gentle wave shape corresponding to the shape of each squeezed portion 7, and each pair of convex portions 37, 37 has a width direction in the convex pattern. It is axisymmetric with respect to the center line extending in the longitudinal direction through the center of. The pair of convex portions 38, 38 are convex portions for the pair of squeezing portions 8, 8. Each of the pair of convex portions 38, 38 has a high basis weight convex portion 38b for forming the high basis weight pressing portion 8b, that is, for pressing the high basis weight portion HB, and a low basis weight pressing portion 8a. It is provided with a low basis weight convex portion 38a for forming, that is, for pressing the low basis weight portion LB. In each convex portion 38, the convex portion 38a for low basis weight and the convex portion 38b for high basis weight are arranged in this order in the direction from the convex portion 35 toward the convex portion 36. In the present embodiment, each convex portion 38 has a curved shape like a gentle wave shape corresponding to the shape of each pressing portion 8, and each pair of convex portions 38, 38 has a width direction in the convex pattern. It is axisymmetric with respect to the center line extending in the longitudinal direction through the center of. The convex portion 36 is a convex portion for the pressing portion 6. The convex portion 36 includes high basis weight convex portions 36b1, 36b2, 36b3, and 36b4 for forming the high basis weight pressing portions 6b1, 6b2, 6b3, 6b4, that is, for pressing the high basis weight portion HB. It is provided with low basis weight convex portions 36a1, 36a2, 36a3, and 36a4 for forming the low basis weight pressing portions 6a1, 6a2, 6a3, 6a4, that is, for pressing the low basis weight portion LB. In the convex portion 36, the convex portion 36a1 for low basis weight, the convex portion 36b1 for high basis weight, the convex portion 36a2 for low basis weight, the convex portion 36b2 for high basis weight, the convex portion 36a3 for low basis weight, and the convex portion for high basis weight. The portion 36b3, the convex portion 36a4 for low basis weight, and the convex portion 36b4 for high basis weight are arranged in this order. In the present embodiment, the convex portion 36 has a closed curved shape such as a heart shape corresponding to the shape of the squeezed portion 6.

Each low basis weight convex portion includes a second high pressure squeezing convex portion and a second low pressure squeezing convex portion adjacent to the second high pressure squeezing convex portion. In the present embodiment, each of the low basis weight convex portions 37a1, 37a2, 38a, 36a1, 36a2, 36a3, and 36a4 has a second high-pressure squeezing convex portion 41a forming the second high-pressure squeezing portion 21a and a second high-pressure squeezing portion 41a. 2 It includes a second low-pressure squeezing convex portion 42a adjacent to the high-pressure squeezing convex portion 41a and forming a second low-pressure squeezing portion 22a. For example, the low basis weight convex portion 36a3 of the convex portion 36 shown in FIG. 6A as a representative of the low basis weight convex portion is erected on the outer peripheral surface of the first roll 151 (indicated by the baseline in the figure). The second low-pressure squeezing convex portion 42a and the second high-pressure squeezing convex portion 41a erected on the upper surface of the second low-pressure squeezing convex portion 42a are included. In the present embodiment, the second low-pressure squeezing convex portion 42a has both side surfaces in a wall shape perpendicular to the outer peripheral surface, and the upper surface is inclined in a tapered shape with respect to both side surfaces. The second high-pressure squeezing convex portion 41a has a frustum shape (example: a cone). In this case, the height of the second low-pressure squeezing convex portion 42a (top surface), that is, the height from the outer peripheral surface (indicated by the baseline in the figure) of the first roll 151 is Ha2, and the second high-pressure squeezing convex portion The height of the portion 41a (top surface), that is, the height from the outer peripheral surface (indicated by the baseline in the figure) of the first roll 151 is Ha1. That is, Ha1> Ha2. Therefore, when forming the squeezed portion, the second high pressure squeezing convex portion 41a can press the absorber 4 deeper than the second low pressure squeezing convex portion 42a. Here, the height Ha2 of the second low-pressure squeezing convex portion 42a is, for example, 1.8 to 5.6 mm. The width da2 of the second low-pressure squeezing convex portion 42a is, for example, 1 to 5 mm. The height Ha1 of the second high-pressure squeezing convex portion 41a is, for example, 2 to 6 mm. The width da1 of the second high-pressure squeezing convex portion 41a is, for example, 0.5 to 4 mm. The difference ΔHa between the height Ha2 and the height Ha1 is, for example, 0.1 to 0.4 mm.

Each high basis weight convex portion includes a first high pressure squeezing convex portion and a first low pressure squeezing convex portion adjacent to the first high pressure squeezing convex portion. In the present embodiment, each of the high basis weight convex portions 35b, 37b1, 37b2, 38b, 36b1, 36b2, 36b3, and 36b4 has a first high pressure squeezing convex portion 41b forming the first high pressure squeezing portion 21b. , A first low pressure squeezing convex portion 42b adjacent to the first high pressure squeezing convex portion 41b and forming a first low pressure squeezing portion 22b. For example, the high basis weight convex portion 36b3 of the convex portion 36 shown in FIG. 6B as a representative of the high basis weight convex portion is erected on the outer peripheral surface of the first roll 151 (indicated by the baseline in the figure). The first low-pressure squeezing convex portion 42b and the first high-pressure squeezing convex portion 41b erected on the upper surface of the first low-pressure squeezing convex portion 42b are included. In the present embodiment, the first low-pressure squeezing convex portion 42b has both side surfaces in a wall shape perpendicular to the outer peripheral surface, and the upper surface is inclined in a tapered shape with respect to both side surfaces. The first high-pressure squeezing convex portion 41b has a frustum shape (example: a cone). In this case, the height of the first low-pressure squeezing convex portion 42b (top surface), that is, the height from the outer peripheral surface (indicated by the baseline in the figure) of the first roll 151 is Hb2, and the first high-pressure squeezing convex portion The height of the portion 41b (top surface), that is, the height from the outer peripheral surface (indicated by the baseline in the figure) of the first roll 151 is Hb1. That is, Hb1> Hb2. Therefore, when forming the squeezed portion, the first high pressure squeezing convex portion 41b can press the absorber 4 deeper than the first low pressure squeezing convex portion 42b. The height Hb2 of the first low-pressure squeezing convex portion 42b is, for example, 1.7 to 5.4 mm. The width db2 of the first low-pressure squeezing convex portion 42b is, for example, 1 to 5 mm. The height Hb1 of the first high-pressure squeezing convex portion 41b is, for example, 2 to 6 mm. The width db1 of the first high-pressure squeezing convex portion 41b is, for example, 0.5 to 4 mm. The difference ΔHb between the height Hb2 and the height Hb1 is, for example, 0.2 to 0.6 mm.

Here, in the present embodiment, the height Ha2 of the second low-pressure squeezing convex portion 42a is the height Hb1 of the first high-pressure squeezing convex portion 41b and the height Hb2 of the first low-pressure squeezing convex portion 42b. The size of the space. The difference ΔHa between the height Ha1 of the second high-pressure squeezing convex portion 41a and the height Ha2 of the second low-pressure squeezing convex portion 42a is the height Hb1 of the first high-pressure squeezing convex portion 41b and the first low-pressure squeezing. The difference between the height Hb2 and the height Hb2 of the convex portion 42b is smaller than the difference ΔHb. That is, ΔHa <ΔHb. Here, (ΔHb—ΔHa) is, for example, 0.1 to 0.5 mm.

As a result, in the fourth semi-finished product P4, that is, in the laminated body of the third semi-finished product P3 (absorbent body 4) and the surface sheet TS, from the non-skin side surface of the absorber 4 in the bottom portion 21aBT of the second high-pressure squeezing portion 21a. The difference ΔUa between the height Ua1 and the height Ua2 from the non-skin side surface of the absorber 4 at the bottom 22aBT of the second low-pressure squeezing portion 22a is the non-absorbent 4 at the bottom 21bBT of the first high-pressure squeezing portion 21b. The difference between the height Ub1 from the surface on the skin side and the height Ub2 from the surface on the non-skin side of the absorber 4 at the bottom 22bBT of the first low-pressure squeezing portion 22b can be smaller than ΔUb. That is, ΔUa <ΔUb can be set.

In the present embodiment, as shown in FIG. 6 (c), in each low basis weight convex portion, the second high pressure squeezing convex portion 41a and the second low pressure squeezing convex portion 42a are convex for low basis weight. The parts are lined up alternately and continuously in the extending direction. Similarly, as shown in FIG. 6 (d), in each high-bath weight convex portion, the first high-pressure squeezing convex portion 41b and the first low-pressure squeezing convex portion 42b are extended. They are lined up alternately and continuously in the direction in which they exist.

Then, referring to FIG. 4 again, the fourth step is carried out in the fourth unit 300D. The fourth unit 300D includes a transport roll 160, a transport roll 161, a coating device 304, and a peripheral cutting device 170. In the fourth step, the back sheet BS in the form of a continuous sheet is supplied from the roll WR4 to the transport roll 161. A hot melt adhesive is applied to one surface of the back sheet BS by the coating device 304. The back surface sheet BS supplied from the transfer roll 161 is pressed onto one surface of the fifth semi-finished product P5 on the transfer roll 160. As a result, the sixth semi-finished product P6 in which the fifth semi-finished product P5 and the back surface sheet BS are laminated is formed. Subsequently, the sixth semi-finished product P6 is cut at the peripheral portion by the peripheral cutting device 170 and separated into the shape of the sanitary napkin 1. As a result, the seventh semi-finished product P7 is formed. The seventh semi-finished product P7 is substantially a menstrual napkin 1 (FIG. 1).

As described above, the menstrual napkin 1 is manufactured.

It should be noted that each low basis weight portion and each convex portion (each high basis weight convex portion and each low basis weight convex portion, each first high pressure squeezing convex portion, each second high pressure squeezing convex portion, each second) described above. The number, position, and shape of (1) the convex portion for low-pressure squeezing and each of the second convex portions for low-pressure squeezing) are examples, and the present invention is not limited to these examples.

Further, for the convenience of manufacturing, considering the case where the timing of transporting the absorber 4 and the timing of pressing for forming the squeezed portions 5 to 8 are slightly different, the convex portion for low basis weight and the convex portion for high basis weight are provided. It may be formed. For example, when it is desired to squeeze the low basis weight portion LB almost certainly in the low basis weight portion convex portion, the length of the low basis weight portion convex portion in the extending direction is longer than the length of the low basis weight portion LB. Moreover, when the squeezing is performed in a timely manner, the length may be set so that the low grammage squeezing portion gradually protrudes into the high grammage portions HB on both sides of the low grammage portion LB. In this case, regardless of whether the timing is early or late, the low basis weight portion LB can be squeezed almost certainly in the low basis weight portion convex portion. Alternatively, for example, when only one of the cases where the timing is early and the case where the timing is late occurs, the length of the convex portion for low basis weight in the extending direction is longer than the length of the low basis weight portion LB, and The length is such that the low basis weight squeezing part gradually protrudes into the high basis weight part HB on one side of the low basis weight part LB (selected according to the ease of timing deviation) when squeezing is performed in a timely manner. You may do it. In this case, even if the timing is deviated, the low basis weight portion LB can be squeezed almost certainly in the low basis weight portion convex portion. Alternatively, for example, when it is desired to squeeze the high basis weight portion HB almost certainly in the high basis weight portion convex portion, the length of the high basis weight portion convex portion in the extending direction is set from the length of the high basis weight portion LB. The length may be set so that the high basis weight squeezed portion gradually protrudes into the low basis weight portions LB on both sides of the high basis weight portion HB when the squeezing is performed in a long time and at the right time. In this case, regardless of whether the timing is early or late, the high basis weight portion HB can be squeezed almost certainly at the high basis weight portion convex portion. In these cases, a high basis weight pressing portion is formed in the low basis weight portion LB or a low basis weight portion is formed in the high basis weight portion HB near the boundary between the low basis weight portion LB and the high basis weight portion HB. A squeezed part can be formed. In that case, the high basis weight portion HB has a portion of the low basis weight pressing portion and the absorber 4 becomes hard, or the low basis weight portion LB has a portion of the high basis weight pressing portion and the surface sheet 2 is the absorber. It is possible to float from 4. However, even if a high basis weight squeezed portion is formed in the low basis weight portion LB or a low basis weight squeezed portion is formed in the high basis weight portion HB in a part near the boundary, each tsubo is next to each tsubo. Since the squeezing portion optimal for the amount is provided and connected to each other, it is possible to prevent the absorber 4 from becoming hard and the surface sheet 2 from floating from the absorber 4, and the same effect as when there is no deviation can be obtained. Can play.

In the above-described embodiment, in the fourth semi-finished product P4 which is a laminate of the third semi-finished product P3 (absorbent body 4) and the surface sheet TS, the degree of squeezing by the second high-pressure squeezing convex portion 41a and the second It can be said that the difference from the degree of squeezing by the low-pressure squeezing convex portion 42a is smaller than the difference between the degree of squeezing by the first high-pressure squeezing convex portion 41b and the degree of squeezing by the first low-pressure squeezing convex portion 42b.

In the present manufacturing method, the second high pressure squeezing portion 21a and the second low pressure squeezing portion 22a are formed by the second high pressure squeezing convex portion 41a and the second low pressure squeezing convex portion 42a of the low basis weight convex portion, and the high basis weight is obtained. The first high-pressure squeezing portion 21b and the first low-pressure squeezing portion 22b are formed by the first high-pressure squeezing convex portion 41b and the first low-pressure squeezing convex portion 42b. The difference between the degree of squeezing by the second high-pressure squeezing convex portion 41a in the low basis weight portion LB and the degree of squeezing by the second low-pressure squeezing convex portion 42a is the difference between the degree of squeezing by the second high-pressure squeezing convex portion 42a. The difference between the degree of squeezing by the portion 41b and the degree of squeezing by the first low-pressure squeezing convex portion 42b is made smaller. That is, in the low basis weight section LB, the difference between the degree of squeezing in the second high-pressure squeezing section 21a and the degree of squeezing in the second low-pressure squeezing section 22a is relatively small, while in the high basis weight section HB. The difference between the degree of squeezing in the first high-pressure squeezing section 21b and the degree of squeezing in the first low-pressure squeezing section 22b is relatively large.
As a result, in the high basis weight portion HB, the degree of squeezing of the first high-pressure squeezing portion 21b becomes relatively large, and the degree of squeezing of the first low-pressure squeezing portion 22b becomes relatively small. Therefore, the first high-pressure squeezing convex portion 41b can sufficiently squeeze the absorber 4 (high basis weight portion HB), and the surface sheet 2 can be prevented from peeling off and floating from the bottom portion 21bBT of the first high-pressure squeezing portion 21b. On the other hand, in the low basis weight portion LB, the degree of squeezing of the second high-pressure squeezing portion 21a is relatively small, and the degree of squeezing of the second low-pressure squeezing portion 22a is relatively large. Therefore, the difference between the degree to which the surface sheet 2 is pressed by the second low-pressure squeezing convex portion 42a and the degree to which the surface sheet 2 is pressed by the second high-pressure squeezing convex portion 41a can be relatively suppressed. Therefore, it is possible to prevent the surface sheet 2 from breaking or floating from the absorber 4 (low basis weight portion LB) due to the breakage. As a result, the first and second high-pressure squeezing portions 21b and 21a and the first and second low-pressure squeezing portions 22b and 22a can easily exert actions such as blocking, diffusing and absorbing excrement. As described above, in the method for manufacturing an absorbent article including the absorber 4 having the high basis weight portion HB and the low basis weight portion LB and the surface sheet 2, the surface sheet 2 and the absorber 4 are squeezed. When the squeezed portions 5 to 8 are formed, it is possible to prevent the surface sheet 2 from floating from the absorber 4 or breaking.

In a preferred embodiment of the present embodiment, the height Ha2 of the second low-pressure squeezing convex portion 42a is the height Hb1 of the first high-pressure squeezing convex portion 41b and the height Hb2 of the first low-pressure squeezing convex portion 42b. The size of the space. The difference ΔHa between the height Ha1 of the second high-pressure squeezing convex portion 41a and the height Ha2 of the second low-pressure squeezing convex portion 42a is the height Hb1 of the first high-pressure squeezing convex portion 41b and the first low-pressure squeezing. The difference between the height Hb2 and the height Hb2 of the convex portion 42b is smaller than the difference ΔHb. That is, ΔHa <ΔHb. Here, (ΔHb—ΔHa) is, for example, 0.1 to 0.5 mm.

That is, in the present manufacturing method, the height Ha2 is kept within a predetermined range, and the difference ΔHa is relatively small in the low basis weight portion LB, while the difference ΔHb is relatively small in the high basis weight portion HB. To make it bigger. As a result, in the high basis weight portion HB, the height Hb1 of the first high-pressure squeezing convex portion 41b becomes relatively high, and the height Hb2 of the first low-pressure squeezing convex portion 42b becomes relatively low. Therefore, the first high-pressure squeezing convex portion 41b can sufficiently squeeze the absorber 4 (high basis weight portion HB), and the surface sheet 2 can be prevented from peeling off and floating from the bottom portion 21bBT of the first high-pressure squeezing portion 21b. On the other hand, in the low basis weight portion LB, the height Ha1 of the second high-pressure squeezing convex portion 41a is relatively low, and the height Ha2 of the second low-pressure squeezing convex portion 42a is relatively high. Therefore, the difference between the degree to which the surface sheet 2 is pressed by the second low-pressure squeezing convex portion 42a and the degree to which the surface sheet 2 is pressed by the second high-pressure squeezing convex portion 41a can be relatively suppressed. Therefore, it is possible to prevent the surface sheet 2 from breaking or floating from the absorber due to the breakage. As a result, the first and second high-pressure squeezing portions 21b and 21a and the first and second low-pressure squeezing portions 22b and 22a can easily exert actions such as blocking, diffusing and absorbing excrement.

In the present embodiment, the difference ΔHa between the height Ha2 of the second low-pressure squeezing convex portion 42a and the height Ha1 of the second high-pressure squeezing convex portion 41a is the height Hb2 of the first low-pressure squeezing convex portion 42b. The difference ΔHb from the height Hb1 of the first high-pressure squeezing convex portion 41b is preferably 30% or more and 80% or less. That is, 0.3ΔHb ≦ ΔHa ≦ 0.8ΔHb is preferable.

In that case, in the present manufacturing method, since the difference ΔHa is 30% or more and 80% or less of the difference ΔHb, the position pressed by the second low-pressure squeezing convex portion 42a that squeezes the low basis weight portion LB in the surface sheet TS. And, it is possible to suppress a large difference from the position pressed by the second high-pressure squeezing convex portion 41a. Therefore, it is possible to further suppress the breakage / floating of the surface sheet 2. However, when it exceeds 80%, the difference ΔHa between the heights Ha2 and Ha1 between the second low-pressure squeezing convex portion 42a for squeezing the low basis weight portion LB and the second high-pressure squeezing convex portion 41a becomes relatively large. The effect of suppressing the breakage / floating of the surface sheet 2 is reduced. When it is less than 30%, the difference ΔHa of the heights Ha2 and Ha1 between the second low pressure squeezing convex portion 42a and the second high pressure squeezing convex portion 41a for squeezing the low basis weight portion LB becomes relatively small, and the low tsubo The force applied to the region where the second high-pressure squeezing portion 21a is formed in the amount portion LB is dispersed in the region where the second low-pressure squeezing portion 22a is formed, and the surface sheet is distributed from the bottom portion 21aBT of the second high-pressure squeezing portion 21a. There is a possibility that 2 will come off.

In the present embodiment, the height Hb1 of the first high-pressure squeezing convex portion 41b is preferably the same as the height Ha1 of the second high-pressure squeezing convex portion 41a. However, it is preferable that the height Hb2 of the first low-pressure squeezing convex portion 42b is lower than the height Ha2 of the second low-pressure squeezing convex portion 42a. That is, the heights Hb1 and Ha1 of the first and second high-pressure squeezing convex portions 41b and 41a, which are formed to have relatively high heights, are aligned as a whole. The heights Hb2 and Ha2 of the first and second low-pressure squeezing convex portions 42b and 42a, which are formed to have relatively low heights, are totally different.

In that case, in the present manufacturing method, the heights Hb1 and Ha1 of the first and second high-pressure squeezing convex portions 41b and 41a, which are formed to have relatively high heights, are aligned as a whole. Therefore, in the first and second high-pressure squeezing portions 21b and 21a that are squeezed relatively deeply, the depth from the surface F3 on the back surface sheet ₃ side of the laminated body can be made the same for the entire high-pressure squeezing portion. As a result, the function of the high-pressure squeezing portion can be similarly exerted on the entire high-pressure squeezing portion in both the high basis weight portion HB and the low basis weight portion LB while suppressing the breakage and floating of the surface sheet 2. Further, by aligning the heights Hb1 and Ha1 of the first and second high-pressure squeezing convex portions 41b and 41a as a whole, a convex portion is formed on the surface of the first roll 151 and the shape of the convex portion is maintained. Processing becomes easy.

In the present embodiment, in the forming step, the convex portions for high basis weight (37b1, 37b2 / 38b / 36b1, 36b2, 36b3, and 36b4) and the convex portions for low basis weight (37a1, 37a2 /) are continuously adjacent to each other. 38a / 36a1, 36a2, 36a3, and 36a4) are continuously adjacent to each other in the high basis weight section (HB2 / HB2 / HB2, HB4, HB3, HB2) and the low basis weight section (LB1, LB2 / LB2 / LB4a). , LB4b, LB4a, LB4b), respectively. At this time, the difference between the height Hb2 of the first low-pressure squeezing convex portion 42b and the height Ha2 of the second low-pressure squeezing convex portion 42a is the height Ha1 of the second high-pressure squeezing convex portion 41a and the second low-pressure squeezing. It is preferable that the height of the convex portion 42a is smaller than the difference ΔHa from the height Ha2.

In that case, in the present manufacturing method, the high basis weight portion HB and the low basis weight portion LB that are continuously adjacent to each other are squeezed by the convex portion for high basis weight and the convex portion for low basis weight that are continuously adjacent to each other. do. At that time, the height Hb2 of the first low pressure squeezing convex portion 42b and the height Ha2 of the second low pressure squeezing convex portion 42a in the continuously adjacent high basis weight convex portion and the low basis weight convex portion 42a. The difference is formed to be relatively small. Therefore, at the boundary between the first low-pressure squeezing portion 22b and the second low-pressure squeezing portion 22a that are continuously formed, a step between the bottom portion 22bBT of the first low-pressure squeezing portion 22b and the bottom portion 22aBT of the second low-pressure squeezing portion 22a is formed. It can be made smaller and can prevent the surface sheet 2 from peeling off or floating. As a result, in both the high basis weight portion HB and the low basis weight portion LB, the functions of the continuously formed pressing portions can be similarly exerted on the entire pressing portion.

In the present embodiment, the difference ΔHb between the height Hb2 of the first low-pressure squeezing convex portion 42b and the height Hb1 of the first high-pressure squeezing convex portion 41b is the height Hb1 of the first high-pressure squeezing convex portion 41b. It is preferably 2% or more and 40% or less (the height Hb1 of the first high-pressure squeezing convex portion 41b is 100%). That is, 0.02Hb1 ≦ ΔHb ≦ 0.4Hb1. Further, the difference ΔHa between the height Ha2 of the second low-pressure squeezing convex portion 42a and the height Ha1 of the second high-pressure squeezing convex portion 41a is 1% or more of the height Ha1 of the second high-pressure squeezing convex portion 41a. It is preferably 20% or less (the height Ha1 of the second high-pressure squeezing convex portion 41a is 100%). That is, 0.01Ha1 ≦ ΔHa ≦ 0.2Ha1.

In that case, in the present manufacturing method, by setting the relationship of each height within the above range, it is possible to further suppress the breakage / floating of the surface sheet 2. As a result, the first and second high-pressure squeezing portions 21b and 21a and the first and second low-pressure squeezing portions 22b and 22a can easily exert actions such as blocking, diffusing and absorbing excrement.

In the present embodiment, the depth of the laminated body (surface sheet 2 and absorber 4) from the surface on the surface sheet 2 side in the first high-pressure squeezing section 21b and the second high-pressure squeezing section 21a is the first high-pressure squeezing section. It is preferable that the heights of the convex portion 41b and the second high-pressure squeezing convex portion 41a are smaller than the heights Hb1 and Ha1. And / or, in the first low-pressure squeezing section 22b and the second low-pressure squeezing section 22a, the depth from the surface of the laminated body on the surface sheet 2 side is the first low-pressure squeezing convex portion 42b and the second low-pressure squeezing convex portion 42b. The height of 42a is preferably smaller than Hb2 and Ha2.

In that case, in the present manufacturing method, the outer peripheral surface of the first roll 151 other than the first and second high pressure squeezing convex portions 41b and 41a and / or the first and second low pressure squeezing convex portions 42b and 42a is a laminated body. Can be made difficult to contact. Thereby, the pressure for squeezing by the first roll 151 and the second roll 152 in the forming step can be effectively used for forming the squeezed portion, and the surface sheet 2 is peeled off from the absorber 4 and floats in each squeezed portion. It can be suppressed more.

FIG. 7 is a schematic view showing an example of the relationship between the convex portion and the semi-finished product in the squeezing device of FIG. 4 (however, it is shown upside down with FIG. 4). In the present embodiment, in the forming step, first, among the convex portions 31 of the first roll 151, at least a part of the first low-pressure squeezing convex portion 42b and / or the second low-pressure squeezing convex portion 42a (in the figure, (Represented by "CP"), it is preferable to first form at least a part of the first low-pressure squeezing portion 22b and / or the second low-pressure squeezing portion 22a. After that, at least a part of the first high-pressure squeezing convex portion 41b and / or the second high-pressure squeezing convex portion 41a forms at least a part of the first high-pressure squeezing portion 21b and / or the second high-pressure squeezing portion 21a. It is preferable to do.

In that case, in the present manufacturing method, first, the surface sheet TS is fixed by forming the first and second low-pressure squeezed portions 22b, 22a which are relatively shallowly squeezed, and then relatively deeply squeezed. By forming the first and second high-pressure squeezing portions 21b and 21a, the first and second high-pressure squeezing portions 21b and 21a can be formed while suppressing the force (shearing force) acting on the surface sheet TS. As a result, when the first and second high-pressure squeezed portions 21b and 21a are formed, the surface sheet TS is partially strongly pulled, and the surface sheet TS breaks or floats from the absorber due to the break. It can be more suppressed.

Another embodiment will be described. FIG. 8 is a schematic diagram partially showing a configuration example of the convex portion of the first roll according to another embodiment. FIG. 8A shows a part of the convex portion for low basis weight, and FIG. 8B shows a part of the convex portion for high basis weight. As shown in FIG. 8, the width Wa and the length La of the convex portion for low basis weight and the width Wb and length La of the convex portion for high basis weight are the same, and the second high-pressure squeezing convex portion 41a and the first. 1 The shape of the convex portion 41b for high-pressure squeezing in a plan view is circular. In that case, in this other embodiment, the diameter da1 of the second high-pressure squeezing convex portion 41a is made larger than the diameter db1 of the first high-pressure squeezing convex portion 41b. In other words, the ratio of the area Sa1 of the first roll 151 in the second high pressure squeezing convex portion 41a to the area Sa2 seen from the radial direction of the first roll 151 in the second low pressure squeezing convex portion 42a is , Is larger than the ratio of the area Sb1 seen from the radial direction of the first roll 151 in the first high pressure squeezing convex portion 41b to the area Sb2 seen from the radial direction of the first roll 151 in the first low pressure squeezing convex portion 42b. .. That is, Sa1 / Sa2> Sb1 / Sb2. However, the shapes of the second high-pressure squeezing convex portion 41a and the first high-pressure squeezing convex portion 41b in a plan view are arbitrary as long as the above inequality is satisfied.

In that case, in the present manufacturing method, in the high basis weight portion HB, the ratio of the area Sb1 of the first high pressure squeezing convex portion 41b to the area Sb2 of the first low pressure squeezing convex portion 42b is relatively small, while the ratio of the area Sb1 is low. In the quantity portion LB, the ratio of the area Sa1 of the second high-pressure squeezing convex portion 41a to the area Sa2 of the second low-pressure squeezing convex portion 42a is relatively increased. As a result, in the high basis weight portion HB, the pressure applied to the region where the first high pressure squeezing portion 21b is formed is relative to the pressure applied to the region where the first low pressure squeezing portion 22b is formed. Can be made larger. Therefore, the first high-pressure squeezing convex portion 41b can squeeze the absorber 4 (high basis weight portion HB) relatively strongly, and the surface sheet 2 is peeled off from the bottom portion 21bBT of the first high-pressure squeezing portion 21b and floats. It can be suppressed. On the other hand, in the low basis weight portion LB, the pressure applied to the region where the second high pressure squeezing portion 21a is formed is relatively smaller than the pressure applied to the region where the second low pressure squeezing portion 22a is formed. can do. Therefore, the second high-pressure squeezing convex portion 41a can press the surface sheet 2 relatively weakly, the surface sheet TS is partially pulled strongly, and the surface sheet 2 breaks or floats from the absorber due to the breakage. Can be suppressed. As a result, the first and second high-pressure squeezing portions 21b and 21a and the first and second low-pressure squeezing portions 22b and 22a can easily exert actions such as blocking, diffusing and absorbing excrement.

<Height>
The height of the back sheet of the bottom of the squeezed portion from the surface on the skin side was measured by the following method. (1) The absorbent article was cut into a size of 25 mm × 25 mm centering on the measurement target portion and used as a sample. (2) Measurement was performed by the following non-contact method using a laser displacement meter (manufactured by KEYENCE CORPORATION: KS-1100). That is, the sample was placed on a horizontal measuring table with the back sheet facing down, and the displacement from the measuring table was measured at five different sites (the bottom of the squeezing groove was measured with a laser displacement meter (3). The average value of the values was taken as the height of the bottom of the squeezed portion (including the thickness of the back sheet). (4) If necessary, subtract the thickness of the back sheet from the height (including the thickness of the back sheet). The height of the bottom of the squeezed portion is set. Further, when the bottom of the first and second low-pressure squeezed portions is inclined with respect to the horizontal plane, the side wall portions of the first and second low-pressure squeezed portions and the first. The height of the position where the bottom of the second low-pressure squeezing portion intersects was defined as the height of the bottom of the first and second low-pressure squeezing portions. However, the thickness of the back surface sheet was determined by the following method. The sample was cut so as to cross the section, and a magnified image was taken from a direction perpendicular to the cut surface of the sample with a digital microscope (manufactured by Keyence Co., Ltd .: VHX-2000), and the measured image was measured from the magnified image.

<Floating or peeling of the surface sheet>
The floating or peeling of the surface sheet was measured by the following method. (1) The height of the surface sheet was measured by the above <height> measurement, and a portion deviating from the original shape (FIG. 1) was identified. (2) A visual inspection was performed on the portion, and it was determined whether or not the portion was lifted or peeled off.

<Sheet basis weight>
The basis weight of each sheet (including the absorber) was measured by the following method. (1) A portion having a size of 50 mm × 50 mm was cut out from the sheet and used as a sample. (2) The sample was dried in an air atmosphere of 100 ° C. or higher. (3) The mass of the sample was measured. (4) The measured value of mass was divided by the area of the sample to calculate the basis weight of the sample. (5) The value obtained by averaging the basis weights of 10 samples was taken as the basis weight of the sheet.

<Sheet thickness>
The thickness of each sheet (including the absorber) was measured by the following method. (1) A portion having a size of 50 mm × 50 mm was cut out from the sheet and used as a sample. (2) The sample was dried in an air atmosphere of 100 ° C. or higher. (3) The thickness of the sheet was measured under the condition of a measuring load of 3 g / cm ² using a thickness gauge (manufactured by Daiei Kagaku Seiki Seisakusho Co., Ltd .: model FS-60DS) equipped with a stylus of 15 cm ² . (4) The thickness of three places was measured with one sample, and the average value of the thicknesses of the three places was taken as the sheet thickness.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. However, the present invention is not limited to such examples.

(1) Samples The menstrual napkins shown in FIGS. 1 and 2 were prepared as samples of Examples. That is, in the first roll, the difference (0.2 mm) between the height of the second high-pressure squeezing convex portion and the height of the second low-pressure squeezing convex portion is the height of the first high-pressure squeezing convex portion and the first low-pressure squeezing. A menstrual napkin was produced by a manufacturing apparatus having a structure smaller than the difference (0.3 mm) from the height of the convex portion. Further, as a sample of the comparative example, the difference (0.3 mm) between the height of the second high-pressure squeezing convex portion and the height of the second low-pressure squeezing convex portion is the height of the first high-pressure squeezing convex portion and the first low. A menstrual napkin was produced by a manufacturing apparatus having the same structure as the difference (0.3 mm) from the height of the convex portion for pressing.

(2) Evaluation method of squeezed part Measure the difference between the height of the bottom of the high-pressure squeezed part and the height of the bottom of the low-pressure squeezed part in each of the low-weighted part and the high-weighted part, and measure the difference between them and the surface sheet. The relationship with the floating or peeling of tsubo was investigated.

(3) Evaluation result In the sanitary napkin of the example, the difference (586 μm) between the height of the bottom of the second high-pressure squeezing part and the height of the bottom of the second low-pressure squeezing part is the height of the bottom of the first high-pressure squeezing part. It was smaller than the difference (787 μm) from the height of the bottom of the first low-pressure squeezed portion. On the other hand, in the physiological napkin of the comparative example, the difference (1579 μm) between the height of the bottom of the second high-pressure squeezing portion and the height of the bottom of the second low-pressure squeezing portion is the height of the bottom of the first high-pressure squeezing portion and the first low. It was larger than the difference (748 μm) from the height of the bottom of the pressed part. Therefore, in the physiological napkin of the comparative example, the surface sheet floated in the vicinity of the pressed portion in the low basis weight portion, but in the sanitary napkin of the example, the surface sheet did not float in the vicinity of the compressed portion. ..

The absorbent article of the present invention is not limited to the above-described embodiment, and the embodiments can be combined or changed within a range that does not deviate from the object and purpose of the present invention.

1 Menstrual napkin (absorbent article)
2 Surface sheet 4 Absorber 21a 2nd high pressure squeezing part 21b 1st high pressure squeezing part 22a 2nd low pressure squeezing part 22b 1st low pressure squeezing part 31 convex part 41a 2nd high pressure squeezing convex part 41b 1st high pressure squeezing convex part 42a 2nd low pressure squeezing convex part 42b 1st low pressure squeezing convex part 151 1st roll 152 2nd roll LB low basis weight part HB high basis weight part

Claims (9)

A method for manufacturing an absorbent article comprising an absorber having a high basis weight portion and a low basis weight portion and a surface sheet.
The laminated body in which the surface sheet and the absorber are laminated between the first roll including the convex portion arranged on the outer peripheral surface and the second roll arranged facing the first roll is described. A supply step in which the surface sheet is supplied so as to face the first roll, and
While sandwiching the laminate between the first roll and the second roll, the convex portion squeezes the laminate from the surface sheet side toward the absorber side to correspond to the high basis weight portion. A deeply squeezed first high pressure section and a shallowly squeezed first low pressure squeezed section were formed at a position corresponding to the low basis weight section, and a deeply squeezed second high pressure squeezed section and a shallowly squeezed section were formed. With a forming step to form a second low pressure squeezed portion,
The convex part is
The convex portion for high basis weight that squeezes the high basis weight portion, and the convex portion for high basis weight.
It is provided with a convex portion for low basis weight that squeezes the low basis weight portion.
The convex portion for high basis weight is
The first high-pressure squeezing convex portion forming the first high-pressure squeezing portion,
A first low-pressure squeezing convex portion adjacent to the first high-pressure squeezing portion and forming the first low-pressure squeezing portion is included.
The convex portion for low basis weight is
The second high-pressure squeezing convex portion forming the second high-pressure squeezing portion,
A second low-pressure squeezing convex portion adjacent to the second high-pressure squeezing portion and forming the second low-pressure squeezing portion.
The difference between the depth of squeezing by the second high-pressure squeezing convex portion and the depth of squeezing by the second low-pressure squeezing convex portion is the depth of squeezing by the first high-pressure squeezing convex portion and the first low. Smaller than the difference in squeezing depth due to the squeezing convex part,
A method for manufacturing an absorbent article. The height of the second low-pressure squeezing convex portion is a size between the height of the first high-pressure squeezing convex portion and the height of the first low-pressure squeezing convex portion.
The difference between the height of the second high-pressure squeezing convex portion and the height of the second low-pressure squeezing convex portion is the difference between the height of the first high-pressure squeezing convex portion and the height of the first low-pressure squeezing convex portion. Smaller
The method for producing an absorbent article according to claim 1. The height of the first high-pressure squeezing convex portion is the same as the height of the second high-pressure squeezing convex portion.
The height of the first low-pressure squeezing convex portion is lower than the height of the second low-pressure squeezing convex portion.
The method for producing an absorbent article according to claim 2. The forming step is
A step of squeezing the high basis weight portion and the low basis weight portion continuously adjacent to each other by the high basis weight convex portion and the low basis weight convex portion continuously adjacent to each other is included.
The difference between the height of the first low-pressure squeezing convex portion and the height of the second low-pressure squeezing convex portion is the difference between the height of the second high-pressure squeezing convex portion and the height of the second low-pressure squeezing convex portion. Smaller than
The method for producing an absorbent article according to claim 2 or 3. The difference between the height of the second low-pressure squeezing convex portion and the height of the second high-pressure squeezing convex portion is the difference between the height of the first low-pressure squeezing convex portion and the height of the first high-pressure squeezing convex portion. 30% or more and 80% or less of
The method for producing an absorbent article according to any one of claims 2 to 4. The difference between the height of the first low-pressure squeezing convex portion and the height of the first high-pressure squeezing convex portion is 2% or more and 40% or less of the height of the first high-pressure squeezing convex portion.
The difference between the height of the second low-pressure squeezing convex portion and the height of the second high-pressure squeezing convex portion is 1% or more and 20% or less of the height of the second high-pressure squeezing convex portion.
The method for producing an absorbent article according to any one of claims 2 to 5. The ratio of the area of the second high-pressure squeezing convex portion as seen from the radial direction of the first roll to the area of the second high-pressure squeezing convex portion as seen from the radial direction is the first low. It is larger than the ratio of the area of the first high-pressure squeezing convex portion to the area of the first roll seen from the radial direction in the first high-pressure squeezing convex portion.
The method for producing an absorbent article according to claim 1. The forming step is performed after forming at least a part of the first low-pressure squeezing portion or the second low-pressure squeezing portion with at least a part of the first low-pressure squeezing portion or the second low-pressure squeezing portion. 2.
The method for producing an absorbent article according to any one of claims 1 to 7. The depth from the surface of the laminated body on the surface sheet side in the first high-pressure squeezing portion and the second high-pressure squeezing portion is the height of the first high-pressure squeezing convex portion and the second high-pressure squeezing convex portion. The depth from the surface of the laminate on the surface sheet side in the first low-pressure squeezing portion and the second low-pressure squeezing portion is smaller than that of the first low-pressure squeezing portion and / or the first low-pressure squeezing portion and. Less than the height of the second low pressure squeezing convex portion,
The method for producing an absorbent article according to any one of claims 1 to 8.

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