JP6012271B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article such as a disposable diaper.

  There is known an absorbent article in which left and right side regions in the crotch portion of the absorbent body are provided with elongated through holes extending in the longitudinal direction, and the absorbent body is three-dimensionally deformed along the longitudinal direction using the through holes. (For example, see Patent Documents 1 and 2). According to these absorbent articles, when an external force is applied from the outer side in the width direction toward the inner side in the wearing state, the portion located in the outer side in the width direction rises inward from the through hole. Thus, there is an advantage that the absorber is easily three-dimensionally deformed. The three-dimensionally deformed absorber easily fits the wearer's buttocks, thereby effectively preventing the liquid from leaking sideways.

  In each of the above-mentioned documents, when a pair of through holes are provided, a technique for forming a low-rigidity portion including a narrow slit-like through hole extending in the longitudinal direction of the absorber over the entire area of the absorber is also known ( (See Patent Document 3). This document describes that the flexibility of the absorber is improved by adopting this configuration.

  As another technique for improving the flexibility of the absorber, a technique described in Patent Document 4 is also known. This document describes an absorbent body composed of a plurality of small absorbent parts separated in a plan view as viewed from the skin contact surface. The small absorption part is formed over the whole area of the absorber. Regarding the construction of the absorbent body from a plurality of small absorbent parts, Patent Documents 5 and 6 also have the same type of description.

JP 2006-341061 A JP 2012-34715 A JP 2006-167424 A JP 2011-135922 A JP-A-11-216161 JP 2009-119154 A

  According to the techniques described in Patent Documents 1 and 2, the fit property to the wearer's buttocks is good, but the flexibility of the absorbent body is not sufficient in the wearer's waist region, so There is room for improvement.

  When the slit-like through-holes having a narrow width are formed over the entire area of the absorber as in the absorber described in Patent Document 3, or over the entire area of the absorber as in the absorber described in Patent Documents 4 to 6. When the small absorbent portion is formed, although the flexibility of the absorbent body is improved, the absorbent body is too flexible and the absorbent body may enter the wearer's buttocks excessively. Therefore, the absorber described in these documents does not reach the absorber described in patent documents 1 and 2 from a viewpoint of fit nature to a buttock.

  Therefore, the subject of this invention is providing the absorbent article which can eliminate the fault which the prior art mentioned above has.

The present invention has a top sheet, a back sheet, and an absorbent core disposed between the top sheet and the back sheet, and a crotch part located in a central region in the longitudinal direction, and a front part in the longitudinal direction from the crotch part and It is an absorbent article provided with a ventral part and a dorsal part extending backward,
The absorbent core has a crotch region located in the crotch region, and a waistline region extending from the crotch region and located in the abdominal side portion and the back side portion,
In the crotch region of the absorbent core, a pair of three-dimensional deformation inducing portions that extend in the longitudinal direction and can three-dimensionally deform the absorbent core along the longitudinal direction are formed,
One or a plurality of bending lines that can deform the waistline region with respect to external force extend in the longitudinal direction in the waistline region at least on the ventral side of the absorbent core to form an easily deformable region,
The easily deformable region is located on an extension line of the three-dimensional deformation guiding portion, and the three-dimensional deformation guiding portion and the easily deformable region are separated from each other at a boundary between the crotch region and the waistline region or in the vicinity thereof. An absorbent article is provided.

  ADVANTAGE OF THE INVENTION According to this invention, the absorptive article which has favorable fitting property to both a wearer's buttocks and the trunk periphery, and exhibits a clean external appearance is provided.

FIG. 1 is a perspective view of a pants-type disposable diaper that is an embodiment of the absorbent article of the present invention. FIG. 2 is a plan view of a state in which the diaper shown in FIG. FIG. 3 is a plan view of the diaper exterior body shown in FIG. 1 as viewed from the skin contact surface side. FIG. 4 is a plan view of the absorbent core in the absorbent main body of the diaper shown in FIG. Fig.5 (a) and (b) are top views (FIG. 4 equivalent view) which shows another embodiment of the absorptive core used for the absorbent article of this invention. FIG. 6 is a schematic view showing an example of an apparatus for manufacturing the absorbent core shown in FIGS. 4 and 5. FIG. 7 is a schematic cross-sectional view along the width direction of a part (concave portion) on the outer peripheral surface side of the rotating drum shown in FIG. FIG. 8 is a schematic cross-sectional view showing a state where an absorbent material is deposited in the concave portion of the rotating drum shown in FIG.

  The present invention will be described below based on preferred embodiments with reference to the drawings. FIG. 1 is a perspective view of a pants-type disposable diaper that is an embodiment of the absorbent article of the present invention. FIG. 2 is a plan view in which the diaper shown in FIG. 1 is opened at its side seal portion and developed in a plane as viewed from the surface sheet side. The diaper 10 shown in FIGS. 1 and 2 is a so-called pants-type diaper. The diaper 10 has a longitudinal direction Y and a width direction X orthogonal thereto. The diaper 10 includes an absorbent main body 20 and an exterior body 30 located on the non-skin contact surface side of the absorbent main body 20. The diaper 10 has a crotch part C located in the central region in the longitudinal direction X, and a ventral side part A and a back side part B extending from the crotch part C forward and backward in the longitudinal direction, respectively. The ventral portion A is arranged on the wearer's ventral side when the diaper 10 is worn. The back part B is arranged on the wearer's back side when the diaper 10 is worn. The crotch part C is arranged on the wearer's crotch when the diaper 10 is worn.

  In the following description, the “non-skin contact surface side” refers to the side (surface) that is disposed on the opposite side of the skin side of the wearer when worn among the front and back sides (surfaces) of each member such as the absorbent main body 20. ). The “skin contact surface side” is the side (surface) that is disposed on the skin side of the wearer when wearing, out of the front and back sides (surfaces) of each member. Moreover, regarding the longitudinal direction of the diaper 10, the abdominal side A side is also referred to as “front side”, and the back side A side is also referred to as “rear side”.

  The absorptive main body 20 has a vertically long rectangular shape, and a known joint such as a hot-melt adhesive is used so that its longitudinal direction coincides with the longitudinal direction of the diaper 10 and extends from the abdominal side A to the back side B. It is joined to the central portion in the width direction of the exterior body 30 by means. Details of the bonding between the absorbent main body 20 and the exterior body 30 will be described later.

  The exterior body 30 is configured such that both side edges of the portion located on the ventral side A and both side edges of the portion located on the back side B are connected to each other by known joining means such as heat seal, high frequency seal, and ultrasonic seal. It is joined. Accordingly, a pair of side seal portions S is formed on the diaper 10. Moreover, the waist opening part 11 and a pair of leg opening parts 12 and 12 are formed in the diaper 10 by the joining, and the exterior body 30 becomes a pants-type solid shape.

  The absorptive main body 20 includes a top sheet 21, a back sheet (not shown), and an absorbent body disposed between both sheets. The absorbent body includes an absorbent core 22 covered with a liquid-permeable core wrap sheet. The top sheet 21 is made of a liquid-permeable sheet and faces the wearer's skin when the diaper 10 is worn. The back sheet is made of a liquid-impermeable or water-repellent sheet and faces the outer package 30.

  As the surface sheet 21 and the back surface sheet, those similar to those conventionally used in the technical field can be used without particular limitation. For example, as the top sheet 21, a liquid-permeable nonwoven fabric or a perforated film can be used. As the back sheet, a water-repellent nonwoven fabric with high water pressure resistance such as a liquid-impermeable film made of a synthetic resin or a spunbond-meltblown-spunbond laminated nonwoven fabric can be used. When the back sheet is liquid impermeable, the back sheet may have water vapor permeability. From the viewpoint of leakage prevention and breathability, the back sheet is preferably a liquid impermeable film made of a synthetic resin having water vapor permeability.

  FIG. 3 shows a plan view of the exterior body 30 as viewed from the skin contact surface side. The exterior body 30 includes an inner layer sheet 31 and an outer layer sheet 32, and elastic members of respective parts fixed between the two sheets. The elastic member of each part will be described later. The outer edge of the exterior body 30 forms the outline of the unfolded diaper 10. The inner layer sheet 31 and the outer layer sheet 32 have the same shape. However, the outer layer sheet 32 has an extending portion that extends outward in the longitudinal direction from the front end edge and the rear end edge of the inner layer sheet 31 (the end edges coincide with the waist opening edge W). The extending portion is folded back from the front end edge and the rear end edge of the inner layer sheet 31 toward the skin contact surface side, and covers the front end area and the rear end area in the longitudinal direction of the absorbent main body 20. The inner layer sheet 31 and the outer layer sheet 32 are preferably composed of the same or different breathable sheets, for example, non-woven fabrics manufactured by various methods.

  A plurality of waist elastic members 33 extending in the width direction of the diaper 10 along the opening edge W are arranged in an extended state on the waist opening edge W of the exterior body 30. A plurality of leg elastic members 34 are arranged along the opening edge L in an extended state on the leg opening edge L of the exterior body 30. Specifically, one end of the leg elastic member 34 is located in the vicinity of the boundary between the abdominal part A and the crotch C, and in the vicinity of the boundary between the dorsal part B and the crotch C, and from there to the leg opening edge L Extending to the central area in the longitudinal direction of the crotch C and turning inward in the longitudinal central area of the crotch C and terminating before reaching the central area in the width direction of the crotch C. Yes. Therefore, the leg elastic member 34 is not disposed in the center region in the width direction of the crotch portion C.

  A plurality of waists extending in the width direction of the diaper 10 are provided on the waist part located between the waist part C and the crotch part C on both the back side part A and the abdomen side part B. Elastic members 35a and 35b are arranged in an extended state. The waistline elastic members 35 a and 35 b are disposed between the waist elastic member 33 and the leg elastic member 34. Of the waistline elastic member 35a and the waistline elastic member 35b, the waistline elastic member 35a is located near the waist elastic member 33, and the waistline elastic member 35b is located near the leg elastic member 34. Therefore, the waistline elastic member 35a is located between the waist elastic member 33 and the waistline elastic member 35b, and the waistline elastic member 35b is located between the waistline elastic member 35a and the leg elastic member 34.

  One or a plurality of waistline elastic members 35a are arranged, and extend continuously from the vicinity of one side of the exterior body 30 to the vicinity of the other side. On the other hand, one or a plurality of waistline elastic members 35b are arranged, one end of which is located in the vicinity of the side portion of the exterior body 30, for example, in the vicinity of the side seal portion S, and the other end is the central region in the width direction of the diaper 10. Terminate before reaching.

  FIG. 4A shows a plan view of the absorbent core 22 in the absorbent main body 20. Although not shown, the entire absorbent core 22 may be covered with a liquid-permeable sheet. The absorbent core 22 has a crotch region 22C located at the crotch portion C of the diaper 10 and waistline regions 22A and 22B extending from the crotch region 22C and located at the ventral side A and the back side B of the diaper 10. doing. Thus, the absorptive core 22 is extended over the area | region from the ventral | abdominal side part A of the longitudinal direction of the diaper 10 to the back | dorsal part B.

  The absorbent core 22 has a front end edge 211a and a rear end edge 211b. The front end edge 211a is located closer to the ventral side A and extends linearly in the width direction. The rear end edge 211b is positioned closer to the back side B and extends linearly in the width direction. The front edge 211a and the rear edge 211b are substantially parallel. Further, the front end edge 211a and the rear end edge 211b have substantially the same length. Further, the absorbent core 22 has a pair of side edges 212 extending in the longitudinal direction. The pair of side edges 212 are substantially parallel and extend linearly in the longitudinal direction. Thus, the absorptive core 22 has a rectangular shape having a long side in the longitudinal direction in plan view.

  As shown in FIG. 4B and FIG. 4C, the absorbent core 22 has a first surface 213a and a second surface 213b. The 1st surface 213a is a skin contact surface, and has faced the surface sheet 21 or the intermediate sheet (not shown) side used as needed. The 2nd surface 213a is a non-skin contact surface side, and has faced the back surface sheet side.

  The absorbent core 22 has a relatively high grammage and has a convex shape protruding toward the non-skin contact surface side, and is adjacent to the high grammage portion 214a and relatively grammage. It has a low basis weight portion 214b that is low in amount and recessed from the non-skin contact surface side toward the skin contact surface side. In the absorptive core 22, the high basic weight part 214a and the low basic weight part 214b are integrally molded. The non-skin contact surface side of the absorbent core 22 has an uneven structure, and the skin contact surface side is flat.

  As shown in FIG. 4A, a plurality of low basis weight portions 214 b extend in parallel with the longitudinal direction of the absorbent core 22. A plurality of the low basis weight portions 214 b extend in parallel in the width direction of the absorbent core 22. As a result, the low basis weight portion 214b has an orthogonal lattice shape extending in the longitudinal direction and the width direction of the absorbent core 22. And the high basic weight part 214a is located in the grating | lattice formed of the low basic weight part 214b. Therefore, each high basic weight part 214a is divided by the low basic weight part 214b, and is independently independent. The shapes of the respective high basis weight portions 214a are substantially the same, are rectangular in plan view, and the length in the longitudinal direction is larger than the length in the width direction. On the other hand, regarding the low basis weight portion 214b, the low basis weight portion 214b extends in the longitudinal direction and the width direction of the absorbent core 22 and is connected to each other to form a continuous body. The width of the low basis weight portion 214b extending in the longitudinal direction of the absorbent core 22 and the width of the low basis weight portion 214b extending in the width direction of the absorbent core 22 may be the same or different.

  As described above, the absorbent core 210 has the block region 219. The block region 219 has a block structure including a plurality of high basis weight portions 214a having relatively high basis weights and low basis weight portions 214b having relatively low basis weights, and each of the high basis weight portions 214a has a block structure. The circumference is surrounded by the low basis weight portion 214b over the entire area and is individually independent. Furthermore, the outermost periphery of the block area | region 219 is enclosed by the low basic weight part 214b. Each of the high basis weight portions 214a is surrounded by the low basis weight portion 214b, and the outermost periphery of the block region 219 is surrounded by the low basis weight portion 214b. Since the stress resulting from the contraction of the leg elastic member 34 and the waistline elastic members 35a, 35b is applied evenly to the side portions in the width direction of the block region 219, the block structure of the absorbent core 22 is destroyed. Is effectively prevented. In particular, when the corner portion of the low basis weight portion 214b located at the outermost periphery of the block region 219 is rounded to draw a convex curve toward the outside, the leg elastic member 34 and the waistline elasticity are formed at the corner portion. Since stress due to the contraction of the member 35 is less likely to concentrate, the block structure of the absorbent core 22 is more effectively prevented from being destroyed.

As for the basic weight of the low basic weight part 214b, the ratio with respect to the basic weight of the high basic weight part 214b is the lower limit value being preferably 1%, and more preferably 3%. The upper limit is preferably 80%, more preferably 70%. The lower limit of the basis weight of the high basis weight portion 214a itself is preferably 200 g / m ² , more preferably 300 g / m ² . The upper limit is preferably 900 g / m ² , more preferably 800 g / m ² . Regarding the low basis weight portion 214b, the lower limit value of the basis weight is preferably 10 g / m ² , and more preferably 50 g / m ² . The upper limit is preferably 500 g / m ² , more preferably 400 g / m ² . The basis weight is measured as follows.
Cut along the boundary line between the high basis weight portion 214a and the low basis weight portion 214b in the absorbent core 22 with a single-edged razor manufactured by Feather Corporation. About the small piece of the high basic weight part 214a obtained by cut | disconnecting, a weight is measured using the electronic balance (A & D company electronic balance GR-300, accuracy: 4 digits below a decimal point). The calculated weight is divided by the area of the small piece of the high basis weight portion 214a to calculate the basic weight of the small piece. Let the average of the basic weight of 5 pieces be the basic weight of the high basic weight part 214a. The basis weight of the non-block area 216 is calculated in the same manner as the basis weight of the high basis weight portion 214a.
Next, along the boundary line extending in the vertical direction (Y direction) of the high basis weight portion 214a and the low basis weight portion 214b, the length is 50 mm, and the width is adjusted to the design dimension of the width of the low basis weight portion 214b. Using a single-edged razor manufactured by the company, a small strip of the low basis weight portion 214b having a thin stripe shape is cut out. The weight of the obtained small piece is measured using an electronic balance (Electronic balance GR-300 manufactured by A & D, accuracy: 4 digits after the decimal point). The calculated weight is divided by the area of the small piece of the low basic weight portion 214b to calculate the basic weight of the small piece. Let the average of the basic weight of 5 pieces be the basic weight of the low basic weight 214b.

The high basis weight part 214a not only has a larger basis weight than the low basis weight part 214b, but also has a larger thickness. The ratio of the thickness of the low basis weight portion 214b to the thickness of the high basis weight portion 214a is preferably a lower limit of 2%, and more preferably 3%. The upper limit is preferably 80%, more preferably 70%. The lower limit of the thickness of the high basis weight portion 214a itself is preferably 2 mm, and more preferably 3 mm. The upper limit is preferably 15 mm, more preferably 12 mm. Regarding the low basis weight portion 214b, the lower limit of the thickness is preferably 0.5 mm, and more preferably 0.7 mm. The upper limit is preferably 8 mm, more preferably 6 mm. The thickness is measured as follows.
A sample is cut into a predetermined size, the measurement site is pressurized at 5 kPa for 10 minutes, and measurement is performed by the following method immediately after dewetting. The number of measurement points is 3 or more per sheet, and the thickness is obtained by averaging two diaper samples (6 or more measurement points). For example, the diaper 1 is cut in the vertical direction (Y direction) or the horizontal direction (X direction) shown in FIG. 2 with a feather razor manufactured by Feather, and the cross section of the cut sample is measured. When it is difficult to measure with the naked eye, the section of the cut sample may be observed and measured at a magnification of 20 to 100 times using, for example, a microscope (VHX-1000 manufactured by KEYENCE).

  The block region 219 is arranged from the abdominal side A side to the back side B side of the absorbent core 22. The block region 219 includes an abdominal side high basis weight portion group 217A provided at a position corresponding to the ventral side portion A, and a back side high basis weight portion group 217B provided at a position corresponding to the back side portion B. And a crotch part high basis weight part group 217C provided at a position corresponding to the crotch part C. Each high basic weight part group is connected. In each high basic weight part group, the number of the high basic weight parts 214a arrange | positioned along the width direction differs. Specifically, the number of the high basis weight portions 214a in the abdominal portion high basis weight portion group 217A and the back side high basis weight portion group 217B is the number of the high basis weight portions 214a in the crotch high basis weight portion group 217C. More than the number of arrangements. For example, as shown to Fig.4 (a), in the ventral part high basic weight part group 217A, the number of the high basic weight parts 214a arrange | positioned along the width direction is eight or six, and dorsal part high In the basis weight part group 217B, the number is 8 or 4, whereas in the crotch high basis weight part group 217C, the number of high basis weight parts 214a arranged along the width direction is two. is there. Thus, in the present embodiment, in the block region 219, the number of arrangements of the high basis weight portions 214a in the abdominal side high basis weight portion group 217A and the back side high basis weight portion group 217B is the crotch high basis weight. There are more than the number of arrangement | positioning of the high basic weight part 214a in the part group 217C. As for the block area | region 219, the dimension of the high basic weight part 214a is the same in each high basic weight part group. Therefore, in the block region 219, the width of the block region 219 in the waist regions 22A and 22B of the abdominal portion A and the back portion B is larger than the width of the block region 219 in the crotch region 22C. By adopting such a configuration, the liquid can be efficiently diffused from the crotch part C corresponding to the urination part to the abdominal part A or the dorsal part B. The absorption area of the ventral part A or the back part B with a distance can be used effectively.

  A non-block region 216 is disposed outside the block region 219 in the absorbent core 22 in the width direction. That is, the absorbent core 22 includes a block area 219 composed of a high basis weight part 214a and a low basis weight part 214b, and a non-block area 216. The non-blocking region 216 is disposed over the entire region in the longitudinal direction at positions on both the left and right sides of the blocking region 219. The block area 219 and the non-block area 216 are partitioned by a low basis weight portion 214b located on the outermost periphery of the block area 219. In the non-blocking region 216, the thickness and basis weight at any position are constant.

  As shown in FIGS. 4B and 4C, in the present embodiment, the thickness of the non-block region 216 is substantially the same as the thickness of the high basis weight portion 214a of the block region 219. However, the relationship between the thickness of the non-blocking region 216 and the thickness of the high basis weight portion 214a is not limited to this, and the thickness of the non-blocking region 216 may be larger, and conversely the thickness of the high basis weight portion 214a. May be large. Specifically, the lower limit of the thickness of the non-blocking region 216 is preferably 2 mm, and more preferably 3 mm. The upper limit is preferably 15 mm, more preferably 12 mm. The method for measuring the thickness is as described above.

The basis weight of the non-block region 216 may be the same as or different from the basis weight of the high basis weight portion 214a of the block region 219. Further, the basis weight of the low basis weight portion 214b of the block region 219 may be the same or different. Specifically, the lower limit of the basis weight of the non-block region 216 is preferably 200 g / m ² , and more preferably 300 g / m ² . The upper limit is preferably 900 g / m ² , more preferably 800 g / m ² . The method for measuring the basis weight is as described above.

  In the absorptive core 22, the high basic weight part 214a and the low basic weight part 214b of the block area | region 219 are integrally molded. Moreover, in the absorptive core 22, the block area | region 219 which consists of the high basic weight part 214a and the low basic weight part 214b, and the non-blocking area | region 216 located in the outer periphery are integrally molded.

  In the absorbent core 22, side opening portions 215 b extending in the longitudinal direction of the absorbent core 22 are formed in the non-block region 216 located outside the block region 219 in the width direction. The side opening 215 b penetrates the entire thickness direction of the absorbent core 22. The side opening 215b extends in the longitudinal direction at the position of the crotch region 22C in the absorbent core 22, in other words, at the position of the crotch part C in the diaper 10. The side opening 215b is formed outward in the width direction of the formation position of the crotch lower high basis weight portion group 217C described above. The length of the side opening 215b is slightly shorter than the length of the crotch lower high basis weight portion group 217C. A pair of side opening portions 215b are formed at symmetrical positions with respect to the longitudinal center line CL. The side opening 215b is symmetrical with respect to the longitudinal center line CL. The side opening 215b has a flat and substantially trapezoidal shape that extends linearly in the longitudinal direction and has an inner side 218a and an outer side 218b that are parallel to each other. The inner side 218a is shorter than the outer side 218b.

  When the absorbent core 22 is covered with a liquid-permeable sheet, the absorbent core 22 includes a sheet positioned on the skin contact surface side of the absorbent core 22 and a sheet positioned on the non-skin contact surface side. Are preferably joined at the side opening 215b. By adopting this configuration, the uprightness of the portion of the absorbent core 22 that is located outwardly in the width direction of the side opening portion 215b is further ensured.

  When the absorbent core 22 is covered with a liquid-permeable sheet, the sheet is not fixed to the absorbent core 22 at a position corresponding to the low basis weight portion 214b of the absorbent core 22. It is preferable. By adopting this configuration, the movement of the high basis weight portion 214a located across the low basis weight portion 214b becomes difficult to be hindered, and a decrease in flexibility of the block region 219 is effectively prevented.

  The absorptive core 22 is comprised from the liquid absorptive material. As the liquid-absorbing material, the same materials as those conventionally used in the technical field of absorbent articles can be used. For example, a highly absorbent polymer made of defibrated pulp or a hydrogel material can be used.

  In the diaper 10 of the present embodiment having the above-described configuration, the pair of side opening portions 215b extending in the longitudinal direction functions as a pair of three-dimensional deformation guide portions that can three-dimensionally deform the absorbent core 22. Specifically, when an external force is applied to the position of the crotch region 22C of the absorbent core 22 from the width direction due to compression by the wearer's thigh or the like, the side opening 215b of the absorbent core 22 is bent. The portion located outside in the width direction from the side opening portion 215b stands up toward the surface sheet 21 side. And this standing site | part comes to just fit a wearer's buttocks. From this viewpoint, as the three-dimensional deformation guiding portion, a low basic weight portion having a lower basic weight than that around the three-dimensional deformation guiding portion can be adopted instead of the side opening portion 215b formed of a through hole.

  Moreover, in the block area | region 219 formed in waist part area | region 22A, 22B among the block area | regions 219 formed in the absorptive core 22, the high basic weight part 214a which comprises this block area | region 219, and the low basic weight part 214b Among them, the low basis weight portion 214b acts as a bending line that can deform the waistline regions 22A and 22B with respect to an external force, so that the waistline regions 22A and 22B are flexibly deformed. As a result, the block region 219 acts as an easily deformable region against external force, and the waistline regions 22A and 22B fit snugly on the wearer's body when the diaper 10 is worn. If at least one or more portions extending in the longitudinal direction are formed in the low basis weight portion 214b, the waistline regions 22A and 22B are easily deformed. In addition to the low basis weight portion 214b extending in the longitudinal direction, If one or more low basis weight portions 214b extending in the width direction are also formed, the waistline regions 22A and 22B are more easily deformed, and the waistline regions 22A and 22B are more suitable for the wearer's body. It is preferable because it will fit.

  In addition, in this embodiment, as shown in FIG. 4A, the block region 219 in the waistline regions 22A and 22B as the easily deformable regions described above is an extension line of the side opening portion 215b as the three-dimensional deformation guiding portion. And the easily deformable region and the three-dimensional deformation guiding portion are separated from each other in the longitudinal direction with the isolation regions 23A and 23B interposed therebetween. The isolation regions 23A and 23B are formed from a part of the non-blocking region 216, which is a portion having high rigidity. Therefore, the deformation of the easily deformable region is prevented by the isolation regions 23A and 23B, which are parts having high rigidity, and the three-dimensional deformation by the three-dimensional deformation guiding portion is not easily affected. Similarly, the three-dimensional deformation by the three-dimensional deformation guiding portion is blocked by the isolation regions 23A and 23B, and the deformation of the easily deformable region is less affected. As a result, the part of the absorbent core 22 that is located in the crotch region 22C and the part that is located in the waistline regions 22A and 22B are independently fitted to each of the wearer's buttocks and waistline without being affected by each other. To come. As a result, excessive entry of the absorbent core into the buttocks of the wearer is effectively prevented, so that the appearance of the diaper in a worn state is clean. From the above viewpoint, the isolation regions 23A and 23B separating the easily deformable region and the three-dimensional deformation guiding portion are located at or near the boundary between the crotch region 22C and the waistline regions 22A and 22B in the absorbent core 22. It is effective. In particular, the isolation regions 23 </ b> A and 23 </ b> B are preferably located in the crotch region 22 </ b> C in the absorbent core 22.

  Note that “the block region 219 is positioned on the extension line of the side opening 215b as the three-dimensional deformation guiding portion” described above means that the inner side 218a and the outer side 218 that define the side opening 215b Means that at least one of the low basis weight portions 214 constituting the block region 219 that extends in the longitudinal direction may be located.

  From the viewpoint of preventing the easily deformable region and the three-dimensional deformation guiding part from being affected by each other due to the presence of the isolated regions 23A and 23B, the rigidity of the isolated regions 23A and 23B is higher than the rigidity of the block region 219 which is the easily deformable region. High is preferred. As described above, since the isolation regions 23 </ b> A and 23 </ b> B form part of the non-block region 216, it is preferable that the rigidity of the non-block region 216 is higher than the rigidity of the block region 219. The term “rigidity” as used herein refers to the degree of difficulty in bending the absorbent core 22, and high rigidity means that the absorbent core 22 is difficult to bend. The degree of rigidity can be measured by, for example, a value of a bending rigidity value measured using KES-FB2-L manufactured by Kato Tech Co., Ltd. or Taber Stiffness Tester manufactured by Kumagai Riki Kogyo Co., Ltd. When this value is large, it can be said that the rigidity is high.

  In the diaper 10 of the present embodiment, a block region 219 is formed not only in the waistline regions 22A and 22B of the absorbent core 22, but also in the crotch region 22C, as shown in FIG. Of the high basis weight portion 214a and the low basis weight portion 214b constituting the block region 219, the low basis weight portion 214b acts as a bend line that can deform the waistline regions 22A and 22B with respect to an external force. 22C is also deformed flexibly. That is, the block region 219 formed in the crotch region 22C also acts as an easily deformable region with respect to external force. In order for the block region 219 formed in the crotch region 22C to act as an easily deformable region, it is sufficient if one or more portions extending in the longitudinal direction are formed in the low basis weight portion 214b. When the low basis weight portion 214b extending in the width direction is formed in addition to the low basis weight portion 214b extending in the longitudinal direction, the crotch region 22C is more easily deformed, and the fit of the absorbent core 22 is improved. Is preferable because it is further improved.

  In order to improve the fit of the absorbent core 22, it is also effective to devise a fixing mode of the absorbent core 22. Specifically, the absorbent core 22 is fixed to the exterior body 30 at the position of the front and rear end regions in the longitudinal direction and extends at least in the longitudinal direction between the front and rear end regions. It is advantageous to make the left and right side areas non-fixed with the exterior body 30. In short, it is desirable that the absorbent core 22 be in a non-fixed state as much as possible with respect to the exterior body 30 in the region between the front and rear end regions in the longitudinal direction. The reason for adopting such a fixed mode is as follows. In the absorbent core 20 in which the block region 219 is formed, the high basis weight portion 214a is individually divided and separated by the low basis weight portion 214b, and therefore, deformation that has occurred in a part of the absorbent core 20 is generated. Difficult to propagate to other parts. For example, in a state where the absorbent core 20 is joined to the exterior body 30 in the front and rear end regions, elastic members (this elastic members are generally waist elastic members 35a and 35b) located in the front and rear end regions. ), The front and rear end regions are deformed. In this case, if the absorbent core 20 is joined to the exterior body 30 in a portion other than the front and rear end regions, the deformation of the absorbent core 20 in the front and rear end regions is propagated to other portions. It may be easy to cause the absorbent core 20 to be difficult to fit the wearer's body sufficiently. On the other hand, when the absorbent core 20 and the outer package 30 are joined in the front and rear end regions of the absorbent core 20 and the two are made as non-fixed as possible between the front and rear end regions, the front and rear ends It becomes difficult for the deformation of the absorbent core 20 in the region to propagate to other parts. As a result, the fit can be sufficiently enhanced even between the front and rear end regions of the absorbent core 20. Note that, unlike an absorbent core having a block structure, a normal absorbent core having no block structure is easy to propagate deformation to a part where the absorbent core is present, so that the normal absorbent core Even if the above-described fixing mode is adopted using a core, the effect of improving the fit of the absorbent core cannot be expected.

  When joining the absorptive core 20 with the exterior body 30 between the longitudinal direction front-end | tip part area | regions, it is preferable to form the fixing | fixed part extended in the longitudinal direction of the diaper 10. As shown in FIG. For example, in the region between the longitudinal front and rear end regions of the absorbent core 20, the central region in the width direction is fixed to the exterior body 30 along the longitudinal direction, and is positioned on the left and right of the central region. It is preferable to make the side area to be unfixed with respect to the exterior body 30.

  There are various modes for fixing the absorbent core 22 and the outer package 30. For example, the back sheet of the absorbent main body 20 and the exterior body 30 facing the back sheet are joined over the entire area of the opposed surfaces, and the back sheet and the absorbent core 22 are joined together at the front and rear end regions of the absorbent core. can do. When the absorbent core 22 is wrapped with a liquid permeable sheet (not shown), the absorbent core 22 and the liquid permeable sheet are bonded to each other over the entire area of the opposing surface, and then the liquid permeable material is bonded. The adhesive sheet and the back sheet 23 can be joined. On the contrary, after the absorbent core 22 (or the liquid-permeable sheet that wraps it) and the back sheet are joined over the entire area of the opposed surfaces, the back sheet and the outer package 30 are joined before and after the absorbent core. You may join in positions, such as an edge part area.

  Returning to FIG. 2, in the ventral side A of the diaper 10 shown in FIG. 2, the absorbent core 22 is arranged so that a part of the absorbent core 22 overlaps with the waistline elastic members 35 a and 35 b in a plan view. Has been. And the absorptive core 22 has the block area | region 219 in the position which overlaps with the waist elastic members 35a and 35b. Specifically, of the waistline elastic members 35a and 35b, the waistline elastic member 35a crosses the block region 219 located in the longitudinal front and rear end region of the absorbent core 22 over the entire region in the width direction. . In other words, the waistline elastic member 35 a is the longest end in the longitudinal direction among the low basis weight portions 214 b extending in the longitudinal direction as the bending lines formed in the waistline region 22 </ b> A in the ventral side portion A of the absorbent core 22. It arrange | positions so that this low basic weight part 214b located near the part may cross | intersect. When the waistline elastic member 35a contracts in the wearing state of the diaper 10, the waistline elastic member 35a crosses the block region 219 located in the longitudinal front and rear end region of the absorbent core 22 across the entire width direction. The low basis weight portion 214b extending in the longitudinal direction in the region 219 is shrunk, and the high basis weight portions 214a come into close contact with each other along the width direction. As a result, it is difficult for wrinkles to occur in the absorbent core 22 when the waistline elastic member 35a contracts, and the absorbent core 22 is easily brought into close contact with the wearer's waistline. Due to these reasons, liquid leakage is effectively prevented. The number of the waistline elastic members 35a crossing the block region 219 may be one, or a plurality of them as shown in FIG.

  5 (a) and 5 (b) show an absorbent core 22 of an embodiment different from the absorbent core shown in FIG. The absorbent core 22 shown in FIG. 5A corresponds to the absorbent core shown in FIG. 4 in which the block region is not formed in the crotch region 22C. Therefore, in the absorbent core 22 shown in the figure, the block region 219 formed in the waistline region 22A and the block region 219 formed in the waistline region 22B are discontinuous. On the other hand, the absorbent core 22 shown in FIG. 5B is a position on the longitudinal center line CL of the absorbent core 22 in the block region 219 formed in the crotch region 22C in the absorbent core shown in FIG. In addition, a vertically long central opening 215a is formed along the longitudinal center line CL. The central opening 215a penetrates the entire thickness direction of the absorbent core 22. The central opening 215a is formed at the formation position of the crotch high basis weight group 217C. The central aperture 215a is not formed at the positions of the ventral portion high basis weight portion group 217A and the back portion high basis weight portion group 217B. A pair of high basis weight portions 214a forming a part of the crotch lower high basis weight portion group 217C are located on both sides in the width direction of the central opening portion 215a. Also when these absorptive cores 22 are used, the same advantageous effect as the case where the absorptive cores shown in FIG. 4 are used is produced.

  Next, the suitable manufacturing method of the absorptive core 22 in the absorber of each embodiment mentioned above is demonstrated. FIG. 6 shows an embodiment of a method for manufacturing the absorbent core 22 and a manufacturing apparatus used therefor. The manufacturing apparatus for the absorbent core 22 supplies the rotating drum 50 that is rotationally driven in the direction of the arrow R1 and the absorbent material 45 that includes the superabsorbent polymer that is the raw material of the absorbent core 22 on the outer peripheral surface of the rotating drum 50. Arranged between the duct 60, the transfer roll 70 that is disposed obliquely below the downstream side of the rotary drum 50 and is driven to rotate in the direction of arrow R2, and between the duct 60 and the transfer roll 70 in the circumferential direction of the rotary drum 50 A vacuum box 65, a mesh belt 75, which is a sheet-like air-permeable member, disposed between the vacuum box 65 and the rotary drum 50 and between the transfer roll 70 and the rotary drum 50; And a vacuum conveyor 80 disposed below.

  As shown in FIG. 6, the rotating drum 50 has a cylindrical shape, and receives power from a prime mover such as a motor, so that members forming the outer peripheral surface rotate around a horizontal axis. A space 56 capable of depressurizing the inside is formed in a non-rotating portion inside the rotating drum 50 (on the rotating shaft side). A known exhaust device (not shown) such as an intake fan is connected to the space 56, and the interior of the space 56 can be maintained at a negative pressure by operating the exhaust device. On the other hand, piping (not shown) capable of taking in air outside the apparatus is connected to the spaces 57 and 58 on the inner side (rotating shaft side) of the rotating drum 50.

  As shown in FIG. 6, a plurality of drum concave portions 51 having a shape corresponding to the shape of the absorbent core 22 to be manufactured are formed on the outer peripheral surface of the rotating drum 50 at equal intervals in the R1 direction. As shown in FIG. 7, a mesh plate 52 having a large number of pores and a metal or resin impermeable member 53 are disposed on the bottom surface of each drum recess 51. Here, the air-impermeable member 53 is provided so as to protrude on the mesh plate 52, and is arranged so as to correspond to the shape and position of the low basis weight portions 214b and 224b described above. As shown in FIG. 7, the region 54 consisting only of the mesh plate 52 partitioned by the air-impermeable member 53 arranged in this way becomes a portion corresponding to the high basis weight portions 214 a and 224 a, and A region 55 consisting only of the mesh plate 52 in the entire outer periphery of the partitioned portion is a portion corresponding to the non-block portions 216 and 226. Moreover, the part of the outer peripheral surface of the rotating drum 50 in which the drum recessed part 51 is not formed consists of the frame body of the rotating drum 50 which consists of metal rigid bodies, and is non-breathable.

  As shown in FIG. 6, one end side of the duct 60 covers the outer peripheral surface of the rotary drum 50 positioned on the space 56 maintained at a negative pressure, and a fiber material introducing device is provided on the other end side (not shown). Have. The fiber material introducing device includes, for example, a pulverizer that pulverizes sheet-like wood pulp into defibrated pulp, and sends the defibrated pulp (fiber material) into the duct. A superabsorbent polymer introduction part to be introduced is provided.

  The transfer roll 70 has a cylindrical outer peripheral portion having air permeability, and the outer peripheral portion rotates in the R2 direction upon receiving power from a prime mover such as a motor. In the non-rotating portion on the inner side (rotating shaft side) of the transfer roll 70, a space 71 that can be depressurized is formed. A known exhaust device (not shown) such as an intake fan is connected to the space 71, and the interior of the space 71 can be maintained at a negative pressure by operating the exhaust device.

  The vacuum box 65 is disposed between the downstream end 61 of the duct 60 and the transfer roll 70 in the rotation direction R1 of the rotary drum 50. The vacuum box 65 has a box-like shape and has an opening that opens in the direction of the rotating drum 50 at a portion facing the rotating drum 50. The vacuum box 65 is connected to a known exhaust device (not shown) such as an intake fan via an exhaust pipe 67, and the inside of the vacuum box 65 can be maintained at a negative pressure by the operation of the exhaust device. .

  The mesh belt 75 is a belt-shaped breathable belt having a mesh connected endlessly, and is continuously guided along a plurality of free rolls and transfer rolls 70 to move along a predetermined path. The mesh belt 75 is driven by the rotation of the transfer roll 70. While the mesh belt 75 passes in front of the opening of the vacuum box 65, the mesh belt 75 is in contact with the outer peripheral surface of the rotary drum 50, and the transfer roll 70 and the rotary drum 50 are closest to each other. In the vicinity of the portion, the transfer drum 70 moves away from the outer peripheral surface of the rotating drum 50.

  The vacuum conveyor 80 includes an endless breathable belt 83 that is stretched between the drive roll 81 and the driven roll 82, and a vacuum box 84 that is disposed at a position facing the transfer roll 70 with the breathable belt 83 interposed therebetween. ing.

  Next, a method for continuously manufacturing the absorbent core using the above-described absorber manufacturing apparatus will be described. First, the exhaust device connected to each of the space 56 in the rotary drum 50 and the vacuum box 65 is operated to make negative pressure. This is because such a negative pressure in the space 56 causes an air flow in the duct 60 to convey the liquid absorbent material 45 to the outer peripheral surface of the rotary drum 50. Next, the rotating drum 50 and the transfer roll 70 are rotated, and the vacuum conveyor 80 is operated. When the fiber material introducing device is operated to supply the fiber material and the superabsorbent polymer into the duct 60, the liquid absorbent material 45 rides on the air flow flowing through the duct 60 and is in a scattered state. It is supplied toward the outer peripheral surface of the rotating drum 50.

  While the portion covered with the duct 60 is being conveyed, the liquid absorbent material (mixture of fiber material and superabsorbent polymer) 45 is sucked into the drum recess 51 of the rotary drum 50. As shown in FIG. 8, the liquid absorbing material 45 is gradually deposited on the mesh plate 52 in each region 54 and region 55 of the drum recess 51. In the deposit 46 thus obtained, a portion (a portion corresponding to the non-breathable member 53) 46 a formed by depositing the liquid-absorbing material 45 on the non-breathable member 53 is relatively deposited of the liquid-absorbent material 45. The amount of the liquid absorbing material 45 is relatively large in the other portions (corresponding to the region 54) 46b and the portion (corresponding to the region 55) 46c, and the deposit 46 as a whole has an uneven structure. To have.

  Then, when the rotary drum 50 rotates and the drum concave portion 51 comes to the position opposite to the vacuum box 65, the deposit 46 in the drum concave portion 51 is sucked to the mesh belt 75 by the suction from the vacuum box 65. It becomes. In this state, the deposit 46 in the drum recess 51 is conveyed to a position immediately before the closest portion between the transfer roll 70 and the rotary drum 50, and is sucked from the transfer roll 70 side in the vicinity of the closest portion to the mesh belt. The mold is released from the drum recess 51 while being sucked by 75 and moved onto the transfer roll 70.

  In this way, the deposit 46 having the concavo-convex structure transferred onto the transfer roll 70 together with the mesh belt 75 is adsorbed to the mesh belt 75 on the transfer roll 70 and is transferred to the vacuum conveyor 80 (the lowermost end of the transfer roll 70). And is transferred to the vacuum conveyor 80 by suction by the vacuum box 84 at the delivery section.

  The long deposit 46 obtained in this way is cut at predetermined intervals to continuously produce the absorber precursor 49. Next, the absorber precursor 49 is compressed by the pressurizing means 90, and the thickness of the deposit 46 constituting the absorber precursor 49 is positively reduced to obtain the target absorbent core 22. As shown in FIG. 6, the pressurizing means 90 includes a pair of rolls 91 and 92, and is configured to pressurize an object to be pressed introduced between the rolls 91 and 92 from the upper and lower surfaces and compress in the thickness direction. .

  When the absorber precursor 49 is compressed by the pressurizing means 90, the portion (region 54 corresponding portion) 46b and the portion (region 55 corresponding portion) 46c having a relatively large liquid absorbing material and a large thickness are disposed in the liquid absorbing material 45. Is compressed more strongly than a relatively thin portion (a portion corresponding to the breathable member 53) 46a. As a result, in the absorbent body manufactured using the manufacturing apparatus described above, the portion (region 54 corresponding portion) 46b (convex portion) and the portion (region 55 corresponding portion) 46c in the deposit 46 are formed in the absorbent core 22. The high basis weight portion 214a and the non-blocking region 216 having relatively high density are formed, and the portion (corresponding portion corresponding to the non-breathable member 53) 46a (concave portion) in the deposit 46 is relatively low in density in the absorbent core 22. It becomes the basis weight part 214b.

  As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to the said embodiment. For example, in the above-described embodiment, the easily deformable region and the three-dimensional deformation guiding portion are separated in the isolation region 23A in both the waist region 22A on the ventral side A side and the waist region 22B on the back side B in the absorbent core 22. However, instead of this, the easily deformable region and the three-dimensional deformation guiding portion may be separated by the isolation region 23A only in the waistline region 22A of the ventral side A.

  Moreover, although the absorbent core 22 of the said embodiment was a thing of a single layer structure, it replaced with this and is 1 layer or 2 on the skin contact surface side or the non-skin contact surface side of the absorbent core 22 of this embodiment. Another absorption layer or more may be arranged to form a multilayer structure.

  Further, when the absorbent core 22 has a multilayer structure, an easily deformable region is provided in one layer of the multilayer structure, and a three-dimensional deformation induction part is provided in the other layer, and when the absorbent core of the multilayer structure is viewed in plan view, An isolation region may be formed between the easily deformable region and the three-dimensional deformation guiding portion.

  In each of the above-described embodiments, the block region 219 in the absorbent core 22 is flat on the skin contact surface side and uneven on the non-skin contact surface side. The non-skin contact surface side may be flat and the skin contact surface side may be uneven.

  Moreover, although each said embodiment is an example which applied the absorbent article of this invention to the pants-type disposable diaper, this invention is absorbent articles other than a pants-type disposable diaper, for example, an unfolding type absorbent article, etc. It can be similarly applied to.

This invention discloses the following absorbent articles further regarding embodiment mentioned above.
<1>
A top sheet, a back sheet, and an absorbent core disposed between the top sheet and the back sheet; and a crotch portion located in a central region in the longitudinal direction and extending from the crotch portion forward and backward in the longitudinal direction, respectively. An absorbent article having a ventral side and a back side to be taken out,
The absorbent core has a crotch region located in the crotch region, and a waistline region extending from the crotch region and located in the abdominal side portion and the back side portion,
In the crotch region of the absorbent core, a pair of three-dimensional deformation inducing portions that extend in the longitudinal direction and can three-dimensionally deform the absorbent core along the longitudinal direction are formed,
One or a plurality of bending lines that can deform the waistline region with respect to external force extend in the longitudinal direction in the waistline region at least on the ventral side of the absorbent core to form an easily deformable region,
The easily deformable region is located on an extension line of the three-dimensional deformation guiding portion, and the three-dimensional deformation guiding portion and the easily deformable region are separated from each other at a boundary between the crotch region and the waistline region or in the vicinity thereof. Absorbent article.

<2>
The absorbent article according to <1>, wherein the three-dimensional deformation guiding portion is formed of a through-hole extending in the longitudinal direction, or a low basic weight portion having a lower basic weight than the periphery of the three-dimensional deformation guiding portion.
<3>
The easily deformable region is composed of a block region, and the block region has a block structure composed of a plurality of high basis weight portions having a relatively high basis weight and a low basis weight portion having a relatively low basis weight. The circumference of each high basis weight part is individually surrounded by the low basis weight part over the entire area,
The absorbent article as described in <1> or <2> in which the said bending line consists of the said low basic weight part.
Absorbent article as described in 1.
<4>
The absorbent article according to any one of <1> to <3>, wherein the rigidity of the region between the three-dimensional deformation guiding portion and the easily deformable region is higher than the rigidity of the easily deformable region.

<5>
A waistline elastic member extending in the width direction of the abdominal side is arranged in an extended state on the abdominal side,
The waistline elastic member is arranged so as to intersect with the bend line located closest to the end in the longitudinal direction among the bend lines formed in the waistline region in the abdomen side portion of the absorbent core. The absorbent article according to any one of <1> to <4>.
<6>
An absorbent body having the topsheet, the backsheet and the absorbent core, and an exterior body positioned on the non-skin contact surface side of the absorbent body,
The absorbent article according to any one of <1> to <5>, wherein the left and right side regions extending in the longitudinal direction of the absorbent core are not fixed to the exterior body.
<7>
The absorbent core is fixed to the exterior body at the position of the front and rear end regions in the longitudinal direction, and between the front and rear end regions, the left and right extending at least in the longitudinal direction of the absorbent core. The absorbent article according to <6>, wherein the side region is not fixed to the exterior body.

<8>
The absorbent article according to <6> or <7>, wherein the exterior body includes an inner layer sheet and an outer layer sheet, and an elastic member fixed between the two sheets.
<9>
In the crotch region of the absorbent core, one or more bending lines that can deform the crotch region with respect to an external force extend in the longitudinal direction to form an easily deformable region <1> to <8>. The absorbent article according to any one of the above.
<10>
The absorbent core has a relatively high basis weight and a high basis weight part having a convex shape protruding toward the non-skin contact surface side, and is adjacent to the high basis weight part and relatively has a basis weight. The absorbent article according to any one of <1> to <9>, which has a low basis weight portion that is low and is recessed toward the skin contact surface side.

<11>
The said low basic weight part is an absorbent article as described in <10> in which the multiple pieces are extended in parallel with the longitudinal direction of the said absorbent core.
<12>
The said low basic weight part is an absorptive article as described in <10> in which the plurality has extended in parallel with the width direction of the said absorptive core.
<13>
The absorbent article according to <10>, wherein the low basis weight portion has an orthogonal lattice shape extending in a longitudinal direction and a width direction of the absorbent core.
<14>
The ratio (S2 / S1) of the basis weight (S2) of the low basis weight part to the basis weight (S1) of the high basis weight part is preferably 1%, more preferably 3%. The absorbent article according to any one of <10> to <13>, wherein the upper limit value is preferably 80%, more preferably 70%.

<15>
The absorbent article according to any one of <1> to <14>, wherein the non-skin contact surface side of the absorbent core has an uneven structure and the skin contact surface side is flat.
<16>
The absorbent core comprises a block region having a block structure composed of a plurality of high basis weight portions having a relatively high basis weight and a low basis weight portion having a relatively low basis weight,
<1> thru | or <15> any one of <1> thru | or <15> which the corner | angular part of the said low basic weight part located in the outermost periphery of the said block area | region is roundish which draws a convex curve toward outward. Absorbent article.
<17>
The absorbent core comprises a block region having a block structure composed of a plurality of high basis weight portions having a relatively high basis weight and a low basis weight portion having a relatively low basis weight,
Any one of <1> to <16>, wherein the block region has a width of the block region in the waist region of the belly side portion and the back side portion larger than the width of the block region in the crotch region Or an absorbent article according to claim 1.

<18>
The absorbent core includes a block region having a block structure composed of a plurality of high basis weight portions having a relatively high basis weight and a low basis weight portion having a relatively low basis weight,
In the block region, the size of the high basis weight portion is a high basis weight portion group located in the waistline region of the ventral side portion, a high basis weight portion group located in the waistline region of the back side portion, and the It is the same in the high basis weight part group located in the crotch region,
The number of the high basis weight portions in the high basis weight portion group located in the waistline region of the abdominal side portion and the high basis weight portion group located in the waist circumference region of the back side portion is located in the crotch portion. The absorbent article according to any one of <1> to <17>, wherein the number is higher than the number of the high basis weight portions arranged in the high basis weight portion group.
<19>
The absorbent core is composed of a block region having a block structure composed of a plurality of high basis weight portions having a relatively high basis weight, and a low basis weight portion having a relatively low basis weight, and a non-block region. The absorbent article according to any one of <1> to <18>.
<20>
The absorptive article according to <19>, wherein the non-blocking region is disposed across the entire length in the longitudinal direction of the absorbent core at positions on both the left and right sides of the block region.

<21>
The absorbent core includes a block region having a block structure composed of a plurality of high basis weight portions having a relatively high basis weight and a low basis weight portion having a relatively low basis weight,
The block region includes a block region formed in the waistline region of the abdominal side portion and a block region formed in the waistline region of the back side portion, and the block region is formed in the crotch region. Not
Any one of <1> to <20>, wherein a block region formed in the waist region on the abdomen and a block region formed in the waist region on the back side are discontinuous. 2. The absorbent article according to 1.
<22>
The absorbent core includes a block region having a block structure composed of a plurality of high basis weight portions having a relatively high basis weight and a low basis weight portion having a relatively low basis weight,
The block region is formed in the crotch region of the absorbent core, and a longitudinally central opening is formed along the longitudinal center line at a position on the longitudinal center line of the absorbent core in the block region. The absorbent article according to any one of <1> to <21>, in which a hole is formed.
<23>
The absorbent core includes a block region having a block structure composed of a plurality of high basis weight portions having a relatively high basis weight and a low basis weight portion having a relatively low basis weight,
The absorbent article according to any one of <1> to <22>, wherein the high basis weight part and the low basis weight part are integrally formed.

<24>
The absorptive core has a block region having a plurality of high basis weight portions having a relatively high basis weight and a low basis weight portion having a relatively low basis weight, and a non-block located on the outer periphery thereof. It consists of an area and
The absorbent article according to any one of <1> to <23>, wherein the block region and the non-block region are integrally formed.
<25>
The said absorptive core is located in the block area | region which has a block structure which consists of several high basic weight part with relatively high basic weight, and low basic weight part with relatively low basic weight, and the width direction outer side And non-blocking area
The absorbent article according to any one of <1> to <24>, wherein a side hole portion extending in a longitudinal direction of the absorbent core is formed in the non-blocking region.
<26>
The absorbent article according to any one of <1> to <25>, wherein the absorbent core is covered with a liquid-permeable sheet.

<27>
The said absorptive core is located in the block area | region which has a block structure which consists of several high basic weight part with relatively high basic weight, and low basic weight part with relatively low basic weight, and the width direction outer side And non-blocking area
Side opening portions extending in the longitudinal direction of the absorbent core are formed in the non-blocking region,
The sheet positioned on the skin contact surface side of the absorbent core and the sheet positioned on the non-skin contact surface side of the absorbent core are joined at the side opening portion <26>. Absorbent article as described in 1.
<28>
The absorbent core has a block region having a block structure composed of a plurality of high basis weight portions having a relatively high basis weight and a low basis weight portion having a relatively low basis weight,
The absorbent article according to <26> or <27>, wherein the sheet is not fixed to the absorbent core at a position corresponding to the low basis weight portion of the absorbent core.
<29>
The said absorptive core is located in the block area | region which has a block structure which consists of several high basic weight part with relatively high basic weight, and low basic weight part with relatively low basic weight, and the width direction outer side And non-blocking area
Side opening portions extending in the longitudinal direction of the absorbent core are formed in the non-blocking region,
The block region is located in the waist region,
The easily deformable region is composed of the block region located in the waistline region,
The block region located in the waistline region is located on an extension line of the side opening as the three-dimensional deformation guiding portion, and the easily deformable region and the three-dimensional deformation guiding portion sandwich an isolation region. The absorbent article according to any one of <1> to <28>, which is spaced apart in the longitudinal direction.

<30>
The absorbent article according to <29>, wherein the isolation region is formed from a part of the non-blocking region.
<31>
An absorbent body having the topsheet, the backsheet and the absorbent core, and an exterior body positioned on the non-skin contact surface side of the absorbent body,
The exterior body has a waist opening and a pair of leg openings formed by joining both side edges of a portion located on the ventral side and both side edges of a portion located on the back side. The absorbent article according to any one of <1> to <30>.
<32>
The absorbent article according to any one of <1> to <31>, which is a pants-type disposable diaper.

DESCRIPTION OF SYMBOLS 10 Disposable diaper 20 Absorbent main body 21 Top sheet 22 Absorbent core 22A, 22B Girth area 22C Inseam area 23 Back sheet 31 Inner layer sheet 32 Outer layer sheet 35a, 35b Girth circumference elastic member 214a High basis weight part 214b Low basis weight part 215a Central opening Part 215b Side opening 216 Non-blocking area 219 Blocking area 217A Abdominal side high basis weight part group 217B Dorsal side high basis weight part group 217C Inseam high basis weight part group

Claims (5)

A top sheet, a back sheet, and an absorbent core disposed between the top sheet and the back sheet; and a crotch portion located in a central region in the longitudinal direction and extending from the crotch portion forward and backward in the longitudinal direction, respectively. An absorbent article having a ventral side and a back side to be taken out,
The absorbent core has a crotch region located in the crotch region, and a waistline region extending from the crotch region and located in the abdominal side portion and the back side portion,
In the crotch region of the absorbent core, a pair of three-dimensional deformation inducing portions that extend in the longitudinal direction and can three-dimensionally deform the absorbent core along the longitudinal direction are formed,
The three-dimensional deformation guiding portion is composed of a through-hole extending in the longitudinal direction, or a low basic weight portion having a lower basis weight than the periphery of the three-dimensional deformation guiding portion,
One or a plurality of bending lines that can deform the waistline region with respect to external force extend in the longitudinal direction in the waistline region at least on the ventral side of the absorbent core to form an easily deformable region,
The easily deformable region is composed of a block region, and the block region has a block structure composed of a plurality of high basis weight portions having a relatively high basis weight and a low basis weight portion having a relatively low basis weight. The circumference of each high basis weight part is individually surrounded by the low basis weight part over the entire area,
The bending line is composed of the low basis weight part,
The easily deformable region is located on an extension line of the three-dimensional deformation guiding portion, and the three-dimensional deformation guiding portion and the easily deformable region are separated from each other at a boundary between the crotch region and the waistline region or in the vicinity thereof. Absorbent article. The absorptive article according to claim 1 whose rigidity of the field between said solid deformation guidance part and said easily deformable field is higher than the rigidity of said easily deformable field. A waistline elastic member extending in the width direction of the abdominal side portion is disposed on the abdominal side portion so as to be extendable and contractible ,
The waistline elastic member intersects with the bend line that is located closest to the end on the abdomen side in the longitudinal direction among the bend lines formed in the waistline region in the abdomen side portion of the absorbent core. The absorptive article according to claim 1 or 2 arranged. An absorbent body having the topsheet, the backsheet and the absorbent core, and an exterior body positioned on the non-skin contact surface side of the absorbent body,
The easily deformable region is formed in the waistline region in the ventral side and the dorsal side of the absorbent core,
Between the easily deformable region in the ventral side portion and the easily deformable region in the dorsal side portion, the absorbent core is more than the three-dimensional deformation guiding portion among the left and right side regions extending in the longitudinal direction. The absorptive article according to any one of claims 1 to 3 in which the part located outside in the width direction is in an unfixed state with said exterior body. In the crotch region of the absorbent core, one or a plurality of bending lines capable of deforming the crotch region with respect to an external force extend in the longitudinal direction between the pair of three-dimensional deformation guiding portions to form an easily deformable region. The absorbent article as described in any one of Claims 1 thru | or 4 currently performed.

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