JP6053123B2 - Absorbent articles - Google Patents

Description

  The present invention relates to absorbent articles such as sanitary napkins, panty liners, and disposable diapers.

  In absorbent articles such as sanitary napkins, the material and structure of each member have been improved to improve its function and wearing feeling. The surface sheet and the absorbent body as members have also been developed with the aim of such improvement.

  For example, Patent Document 1 discloses an absorbent article in which a surface sheet made of a nonwoven fabric and an absorbent body made of pulp fibers are integrated to form an uneven shape. The absorber forms an arch with respect to the back sheet at the convex portion. And the said absorber is joined to the back surface sheet with the hot-melt-type adhesive agent in the recessed part.

  Patent Document 2 discloses an absorbent article in which a plurality of concave portions pressed from a surface layer to an absorbent layer are formed, and the fibers of the surface layer and the absorbent layer are joined in the concave portions.

JP 2009-1119022 A JP 2003-291234 A

Although the absorbent article disclosed in Patent Document 1 is excellent in texture, since hot melt is adopted for bonding the absorber and the back sheet, pinpoint hot melt coating is very difficult. For this reason, hot melt may exist also in the part corresponding to the arch of the absorption layer convex part on a back surface sheet. In this case, when pressure is applied from the front surface side, the arch and the back sheet are bonded, the hollow structure is broken, and the flexibility may be impaired. Further, in the absorbent article disclosed in Patent Document 2, although the top sheet and the back sheet are joined by heat fusion, the back material side of the absorbent layer has a flat structure, so that in the first place it is flexible and cushioning. Not considered. In addition, the adhesive layer and the back surface material are inferior in flexibility because it is considered that an adhesive is provided over almost the entire surface in order to stabilize the adhesion.
The present invention relates to an absorbent article that further improves the soft texture on the skin, has good cushioning properties, and increases the sustainability of these soft textures and good cushioning properties.

  The present invention is an absorbent article having a leak-proof layer and an absorbent layer disposed on the skin contact surface side of the leak-proof layer, the absorbent layer having a heat-sealing fiber and a hydrophilic fiber. A plurality of absorbent layer convex portions formed by integrally forming the skin contact surface side and the non-skin contact surface side in the thickness direction. And the absorbent layer concave portion, and the absorbent layer convex portion and the absorbent layer concave portion are arranged alternately adjacent to each other in different directions intersecting in plan view to form an uneven shape, and the non-skin contact surface side of the absorbent layer convex portion Forming an arch, a space is disposed between the leak-proof layer, and only on the non-skin contact surface side of the concave portion of the absorbent layer that is dispersedly arranged in plan view connecting the arch and the arch. A joint portion with a leak-proof layer is disposed, and in the joint portion, the heat-sealing property of the heat-sealing fiber and the absorption layer And Kibomo layer are melt bonded at the space portion is to provide an absorbent article means for bonding the leakproof layer and the absorbent layer is not present.

In addition, the present invention provides a suitable method for producing the absorbent article,
In the meshing portion between the first roll having a concavo-convex shape on the peripheral surface and the second roll having a concavo-convex shape meshing with the concavo-convex shape of the first roll, A step of conveying and sandwiching the absorbent layer sheet member containing the adhering fibers to form a plurality of concave portions and convex portions on the absorbent layer sheet member, and the absorbent layer sheet member after the shaping. In a state of being in close contact with the peripheral surface of one roll, the sheet member for an absorbent layer is brought into contact with the sheet member for a leak-proof layer separately conveyed only at the convex portion of the first roll. And a step of fusing the sheet member for an absorbent layer and the sheet member for a leak-proof layer to form a composite sheet member.

  The absorbent article of the present invention can further improve the soft texture against the skin, have good cushioning properties, and enhance the sustainability of these soft textures and good cushioning properties.

It is the top view which showed typically the panty liner as preferable one Embodiment (1st Embodiment) of the absorbent article of this invention. It is the partial cross section perspective view which cut and showed the part of II (complex of an absorption layer and a leak-proof layer) in FIG. FIG. 3 is a cross-sectional view schematically illustrating an enlarged portion III in FIG. 2. It is the partially expanded plan view which showed typically the arrangement | positioning of the absorption layer convex part and the absorption layer recessed part in the skin contact surface side of the absorption layer of FIG. 2 with the junction part. It is the partially expanded plan view which showed typically the modification of arrangement | positioning of an absorption layer convex part, an absorption layer recessed part, and a junction part. It is sectional drawing which showed typically the cross-sectional shape of a surface layer, an absorption layer, and a leak-proof layer about the panty liner of 2nd Embodiment. It is sectional drawing which showed typically the cross-sectional shape of the composite_body | complex of an absorption layer and a leak-proof layer about the panty liner of 3rd Embodiment. It is process explanatory drawing which showed typically the one part process of the preferable manufacturing method of the absorbent article of this invention. FIG. 8 is an enlarged perspective view showing a part of an embossing roll used in the process shown in FIG. 7 in an enlarged manner. It is explanatory drawing which expanded and showed typically the process part which joins the upper layer and lower layer of process explanatory drawing shown in FIG.

  The absorbent article of the present invention is characterized in that an absorbent layer shaped in a concavo-convex shape is fusion-bonded not only on the entire surface of the leak-proof layer but on the concave portion of the absorbent layer. The absorption layer and the surface layer are not in contact with each other, that is, not integrated. The absorbent article of the present invention using the composite of the absorbent layer and the leak-proof layer will be described below with reference to the drawings based on the panty liners of Embodiments 1 to 3. However, the absorbent article of the present invention is not limited to the panty liners of Embodiments 1 to 3 below, and can be applied to sanitary napkins, incontinence pads, incontinence liners, disposable diapers, urine pads and the like.

  In the present invention, unless otherwise specified, the side in contact with the human body is referred to as the skin surface, skin contact surface or surface, and the opposite side is referred to as the non-skin surface, non-skin contact surface or back surface. Further, in the specific member, the skin surface side, the skin contact surface side or the surface side refers to a part / surface closer to the wearer's skin, and the non-skin surface side, the non-skin contact surface side and the back surface side are It is a term that means a relative positional relationship that indicates a part / surface far from the skin of the wearer. The direction positioned on the front side of the human body when worn is referred to as the front, and its end is referred to as the front end, and the direction positioned on the rear is referred to as the rear, and the end is referred to as the rear end. The normal direction of the front or back surface of the absorbent article is referred to as the thickness (thickness) direction, and the amount is referred to as thickness (thickness).

[First Embodiment]
First, the entire structure of a panty liner 30 as a preferred embodiment (first embodiment) of the absorbent article of the present embodiment will be described with reference to FIG.
The panty liner 30 according to the first embodiment includes a composite body 10 including a liquid-impermeable leak-proof layer 3 and an absorbent layer 2 disposed on the skin contact surface side of the leak-proof layer 3. A liquid-permeable surface layer 1 is disposed on the skin contact surface side of the composite body 10, that is, on the absorption layer 2 side.
The surface layer 1 is bonded to the outer periphery of the absorption layer 2 by a leakage preventive layer 3 and a bonding means such as heat sealing and ultrasonic sealing, or a combination of a hot melt adhesive. In the panty liner 30, the surface layer 1 has a generally flat shape, and the surface layer 1 and the absorption layer 2 are not joined. In other words, the absorption layer 2 and the surface layer 1 are not in contact with each other, that is, not integrated.

  The surface layer 1 is a sheet body arranged on the skin contact surface side of the absorption layer 2, and allows the excretion liquid to pass through the absorption layer 2 quickly. The surface layer 1 is made of a hydrophilic air-through nonwoven fabric from the viewpoint of promptly permeating the excreted body fluid and transmitting it to the absorption layer and from the viewpoint of good touch. The leak-proof layer 3 prevents liquid leakage on the non-skin contact surface side of the absorbent layer 2. From this point of view, the leak-proof layer 3 is made of a liquid-impermeable member, and is, for example, a sheet formed using a liquid-impermeable porous film or the like. Moreover, it is preferable that the leak-proof layer 3 has moisture permeability from a viewpoint of prevention of stuffiness. The liquid poor permeability means a property that hardly allows liquid to pass through, and includes waterproofness, water repellency, and liquid impermeability. In the present invention, the surface layer 1 and the leak-proof layer 3 are not limited to the sheet body of the present embodiment, but have various aspects such as a combination of a plurality of members and a variation in thickness. Can be arbitrarily adopted.

  Next, the composite 10 of the absorption layer 2 and the leak-proof layer 3 will be described in detail below with reference to FIGS. In addition, in FIG. 3, the surface layer 1 distribute | arranged to the skin contact surface side of the composite_body | complex 10 is shown with the dashed-dotted line.

  The absorbent layer 2 has a heat-fusible fiber 25. Moreover, it has the hydrophilic fiber 26 which absorbs and retains excretory fluid. The absorbent layer 2 is a sheet body in which these constituent fibers are joined at an entanglement point 27 (see a circle A enlarged sectional view of FIG. 2). Thereby, in addition to the softness of the fiber, the entire absorbent layer 2 has elasticity and elasticity, and is excellent in shape retention as a sheet body. Such an absorption layer 2 is suitable for an uneven shape described later. First, it is because the entire absorbent layer 2 is made of fibers joined to the entanglement points 27, so that it has excellent flexibility and shape stability after shaping. Secondly, by joining the entanglement points 27, the space between the fibers is maintained and the capillary force is further stabilized. That is, the absorption performance is favorably maintained without crushing the space of the fiber tube by shaping. Further, these shape stability and excellent absorption performance are easily sustained by the stiffness and elasticity of the sheet body even under pressure.

  On the other hand, the absorbent layer 2 is hardened as compared with a fiber pile of pulp fibers in which a plurality of entanglement points 27 are joined and the shape is stabilized, so that the entanglement points are not joined. However, by utilizing the stiffness and elasticity of the absorbent layer 2 to form an uneven shape, a rather good cushion feeling is obtained, softness is generated, and the hardness of the sheet body is reduced.

  From the viewpoint of enhancing the sustainability even when wet during use of the panty liner 30, the fibers are directly fusion-bonded at the entanglement point 27 by the heat-fusibility of the heat-fusible fiber 25. Is preferred. This bonding has higher bonding strength when wet than indirect bonding with an adhesive, and is excellent in shape retention when wet.

<Uneven shape of absorption layer 2>
As shown in FIG. 2, the absorbent layer 2 has a plurality of absorbent layer convex portions 21 and absorbent layer concave portions 22 formed by integrally shaping the skin contact surface side and the non-skin contact surface side in the thickness direction. It has an uneven shape.
The absorption layer convex portion 21 is a skin surface convex portion 21a protruding in the skin contact surface side (Z1) direction when viewed from the skin contact surface side, and is non-skin contact when viewed from the non-skin contact surface side. This is a non-skin surface recess 21b that is recessed from the surface side (Z2) to the skin contact surface side (Z1). On the other hand, the absorption layer concave portion 22 is a skin surface concave portion 22a that is recessed on the non-skin contact surface side (Z2) when viewed from the skin contact surface side, and the skin contact surface when viewed from the non-skin contact surface side. It is the non-skin surface convex part 22b which protruded from the side (Z1) to the non-skin contact surface side (Z2).
A plurality of the absorption layer convex portions 21 and the absorption layer concave portions 22 are alternately and periodically adjacent to each other in different directions intersecting in plan view (X direction, Y direction and different directions intersecting with these in FIG. 2). Has been placed. Thereby, the absorption layer 2 is a shape which has the periodic repetition of an unevenness | corrugation over the substantially whole area of a plane direction with respect to the surface layer 1 and the leak-proof layer 3. FIG.

As shown in FIG. 3, the skin contact surface side of the absorbent layer 2 is in contact with the wearer's skin through the surface layer 1 at the skin surface convex portion 21a, and the indirect contact area with the skin. Can be suppressed. Thereby, the thickness of the absorption layer 2 does not easily affect the skin, and the softness of the surface layer 1 is easily transmitted to the skin. In addition, when the panty liner 30 is mounted, the pressure applied to the absorbent layer 2 via the surface layer 1 that is in surface contact with the skin is dispersed in the plurality of skin surface convex portions 21a. Thereby, it has cushioning properties to reduce the impact on the body, and it is possible to reduce the burden on the skin and the uncomfortable feeling due to the panty liner wearing.
Moreover, the skin surface recessed part 22a forms a space between the surface layer 1, and is excellent in air permeability. In addition, the skin surface recess 22a has a high ability to capture excretory fluid that flows down from the surrounding skin surface protrusion 21a. Thereby, the excretory fluid permeated from the surface layer 1 can be further absorbed and held away from the skin. As a result, the return of the excretory fluid to the surface layer 1 is effectively suppressed, and the wet feeling of the wearer's skin is suppressed. Furthermore, even under the body pressure when the panty liner 30 is worn, the contact between the surface layer 1 and the absorbent layer 2 is limited to the absorbent layer convex portion 21, and liquid return can be suitably suppressed. A good wearing feeling is produced by these.

  Furthermore, it is preferable that the skin surface convex part 21a of the absorption layer 2 is a dome shape which protrudes from the skin surface recessed part 22a to the skin contact surface side and has a top part 21t from the viewpoint of reducing the contact area. Moreover, it is preferable that the skin surface recessed part 22a is a hollow shape which reaches from the several skin surface convex part 21a of the periphery to the bottom part top part 22t from a viewpoint of liquid capture property. For example, a conical shape, a truncated cone, an elliptical cone, an inverted elliptical truncated cone shape, a mortar shape or a bowl shape, and the like, preferably have a shape in which the expansion of the concave portion converges to the bottom top portion 22t.

On the other hand, as shown in FIG. 3, the non-skin contact surface side of the absorbent layer 2 is provided with a joint 51 with the leak-proof layer 3 only in the non-skin surface convex portion 22b corresponding to the skin surface concave portion 22a. (Hereinafter, a laminated region of the absorption layer 2 and the leak-proof layer 3 in which the joint portion 51 is disposed is referred to as a region M1). The absorption layer 2 is a sheet body and is directly bonded and fixed to the leak-proof layer 3.
In the joint portion 51, an embossing process is performed, and the absorbent layer concave portion 22 and the leak-proof layer 3 are directly fused by thermal fusion of the thermal fusion fiber 25 of the absorbent layer 2 without using an adhesive or the like. It is joined. Thereby, the junction 51 has high wet strength. This point will be described in more detail in the description of the region M1 described later.
In addition, the non-skin surface recess 21 b corresponding to the skin surface protrusion 21 a of the absorbent layer 2 is non-joined with the absorbent layer 2 in a region surrounded by the plurality of joints 51, and the cross-sectional shape thereof is that of the absorbent layer 2. The arch 81 is formed (hereinafter, the laminated region of the absorption layer 2 and the leak-proof layer 3 in which the arch 81 is disposed is referred to as a region M2). Thereby, a space 41 is formed between the non-skin surface recess 21 b of the absorbent layer 2 and the leak-proof layer 3. In the space portion 41, there is no joining means such as an adhesive that joins the absorption layer 2 and the leak-proof layer 3.
As described above, the absorbent layer 2 is formed only on the non-skin contact surface side (non-skin surface convex portion 22b) of the absorbent layer concave portion 22 that is connected to one arch 81 and the arch 81 adjacent to the arch 81 in a plan view. And the leak-proof layer 3 are joined.

  In the region M2, the absorption layer convex portion 21 and the leak-proof layer 1 are separated due to the presence of the space portion 41. In this part, the absorption layer 2 can be freely deformed. That is, the skin surface convex part 21a of the absorption layer 2 has a large compression work with respect to the pressing from the skin contact surface side of the surface layer 1. And the soft touch when the panty liner 30 touches skin increases. Thereby, the above-mentioned cushioning property is accompanied by a soft texture. And it is excellent in the compression recovery property of the absorption layer convex part 21 even if it receives a wearer's body pressure etc. by elasticity and elasticity with which the absorption layer 2 which consists of the said sheet | seat body is provided.

In particular, in the panty liner 30 incorporating the composite 10 of the absorbent layer 2 and the leak-proof layer 3, the absorbent layer 2 comes into contact with the skin of the wearer via the surface layer 1 in the vicinity of the plurality of top portions 21t. In this case, the absorption layer convex portion 21 receives the body pressure while reducing the contact area with the skin via the surface layer 1. This body pressure is not limited to pressing in the thickness direction (white arrow f1 in FIG. 3), but is applied as pressure from multiple directions (white arrows f2 and f3 in FIG. 3) in accordance with the wearer's movement.
Even in this case, the absorbent layer convex portion 21 is separated from the leak-proof layer 3 due to the presence of the space portion 41 while the arch 81 is maintained with respect to the leak-proof layer 3 in the non-skin surface concave portion 21b on the basis of the joint portion 51. Easy to move (large compression work). And it can deform | transform flexibly and can follow the force from many directions. Therefore, rubbing with the skin that can be repelled by the skin surface convex portion 21a of the absorbent layer 2 hardly occurs, and there is little friction. As a result, the touch on the skin is soft and has a gentle texture. These bring about the improvement of the wearing feeling of an absorbent article. And because of the elasticity of the absorbent layer 2, the shape of the absorbent layer convex portion 21 immediately recovers and a good cushion feeling is obtained.

The above-mentioned soft texture is easy to be deformed at the time of pressing, and is shown as a value of WC (compression work amount). Further, a good cushion feeling is recoverability or elasticity after pressing, and is indicated as a value of RC (compression resilience, work at the time of compression release). The RC value and the WC value are numerical values obtained using the LC value, which is the linearity of the compression load-compression strain curve measured according to KES (Kawabata Evaluation System), as a scale.
In composite 10 of the absorbent layer 2 and the leak-barrier layer 3, WC value is preferably 1.5mN · cm / cm ² or more, 2.0 mN · cm / cm ² or more is more preferable. By setting it to the lower limit or more, the skin becomes soft. Similarly, the RC value is preferably 40% or more, and more preferably 50% or more. By setting it as the lower limit or more, it becomes easy to follow the shape and movement of the wearer's body.

(Measurement method of WC value and RC value)
The WC value and RC value are measured using a handy compression measurement program of KES-G5 “Handy Compression Tester” (trade name) manufactured by Kato Tech. Specific measurement conditions are as follows. That is, sample: cloth / film, SENS: 2, type of force meter: 1 kg, SPEED
RANGE: 0.02 cm / sec, DEF sensitivity: 20, pressurization area: 2 cm ² , measurement load: set to 5.0, maximum compression load 50 mN / cm ² , standard temperature and humidity conditions (23 ° C./50% RH )

<Regarding the junction 51 in the region M1>
In addition to the shape retention of the absorbent layer 2, the above-described action due to the uneven shape of the absorbent layer 2 is further enhanced in sustainability during the wearing of the panty liner 30 by the fusion bonding of the joint portion 51 in the region M1. This point will be described in detail below.

  In the joint portion 51, the absorbent layer concave portion 22 corresponding to the base of the absorbent layer convex portion 21 and the leak-proof layer 3 are fusion-bonded due to the heat-fusibility of the heat-sealing fiber 25 of the absorbent layer 2. Therefore, it is preferable that the non-skin contact surface side of the absorbent layer 2 has a higher content of the heat-fusible fiber 25 than the skin contact surface side. For example, the region P5 in the vicinity of the non-skin contact surface where the joint portion 51 is present, compared to the content (r4) of the heat-sealing fiber 25 in the region P4 in the vicinity of the skin contact surface shown in the enlarged cross-sectional view of the circle B in FIG. Is high (r4 <r5). This content rate can be measured by the same method as the fiber density measuring method described later.

  Various materials that impart poor liquid permeability can be used for the leak-proof layer 3 to be fused with the absorbent layer recess 22, and it is preferably made of a heat-meltable material on the skin contact surface side. Thereby, it becomes easy to make the heat sealing | fusion fiber 25 and the leak-proof layer 3 of the absorption layer recessed part 22 melt | fusion-join. As this heat-meltable material, various materials used for this type of article can be adopted. For example, as described above, from the viewpoint of poor liquid permeability and moisture permeability, a porous film and the like can be mentioned.

Moreover, it is preferable that the melting point (j1) of the heat-fusible fiber of the absorption layer 2 is substantially the same as the melting point (j2) of the heat-fusible material of the leak-proof layer 2. Here, “substantially the same” means that the absolute value of the difference between both melting points is within 20 ° C., preferably within 10 ° C. By doing so, it becomes easy to firmly fix the absorption plexus 2 and the leak-proof layer 2 by heat fusion.
On the other hand, it is preferable that melting | fusing point (j1) of the heat-fusion fiber of the absorption layer 2 is below melting | fusing point (j2) of the heat-meltable material of the leak-proof layer 2 (j1 <= J2). This is suitable for reducing the hardening of the member by the embossing process. That is, by setting the ultrasonic wave of the ultrasonic embossing and the temperature of the heat embossing together with the melting point of the heat-sealing fiber 25 of the absorption layer 2, the heat melting of the leak-proof layer 3 is reduced and the member is cured by melting. Can be suppressed. At this time, the difference in melting point (j2−j1) is preferably 0 ° C. or higher, and more preferably 1 ° C. or higher. The upper limit is preferably 20 ° C. or lower, and more preferably 10 ° C. or lower.

  The joining by the heat-sealing property of the heat-sealing fiber 25 is suitable for good formation of the dome and arch 81 of the absorbent layer convex portion 21 in the region M2, securing of the space portion 41, and retention of these forms. . This is because the fusion-bonding by the heat-sealing fiber 25 has the following effects. And this joint strength improves the retainability of the uneven shape of the absorbent layer 2 in combination with the stiffness and elasticity of the absorbent layer 2 as described above, and it has a soft texture and good cushioning durability. The improvement is more certain.

  First, in the joining by heat fusion of the heat fusion fiber 25, the fiber itself is melted and directly joined to the leak-proof layer 3. Moreover, the heat-melting material corresponding to the leak-proof layer 3 is also melted to fix the fibers. This joining is unlikely to be peeled even when wet with excretory fluid or the like, unlike indirect joining with a conventional hot-melt adhesive or the like. That is, the joint portion 51 has a high wet strength. Thereby, the root of the arch 81 of the absorbent layer convex portion 21 is firmly fixed to the leak-proof layer 3 and hardly peeled off. The joint 51 lays the foundation of the arch. As a result, the shape and uprightness of the absorbent layer convex portion 21 and the space portion 41 are maintained even when wet and are not easily collapsed, and the durability of the soft cushioning property is enhanced. In particular, the joint portion 51 is limited to a range in the vicinity of the bottom top portion 22t of the absorbent layer concave portion 22 that is regularly distributed and scattered in a plan view, and its joint area is compared with a strip-like joint portion in the longitudinal direction of the article. Therefore, it is suitable in a form that can be kept small.

  Secondly, the heat-sealing of the heat-sealing fiber 25 can be accurately bonded to the leak-proof layer 3 by concentrating the absorption layer recess 22, particularly in the vicinity of the bottom top portion 22 t of the absorption layer recess 22. That is, the bonding strength can be concentrated on the bonding portion 51. In the case of a conventional adhesive such as hot melt, it is difficult to apply the adhesive only to the necessary part and form the joint 51 only at the necessary part. On the other hand, in the joining by heat fusion, only the absorbent layer concave portion 22 formed with unevenness, in particular, the vicinity of the bottom top portion 22t can be pressed against the absorbent layer 2 and can be fused and concentrated at a pin point. In addition, it is possible to prevent the presence of means for joining the absorption layer 2 and the leak-proof layer 3 such as an adhesive at other portions. Therefore, even if the absorbent layer convex portion 21 is crushed, it is not joined to the leak-proof layer 3. Thereby, in area | region M2, the arch 81 of the absorption layer convex part 21, ie, the non-skin surface recessed part 21b, is easy to be formed suitably, and sufficient space part 41 can be ensured.

  Thirdly, unlike the application of the adhesive, the hardening of the interface between the absorption layer 2 and the leak-proof layer 3 is limited to the joint portion 51 only. In addition, since the absorbent layer recess 22 is fused to the leak-proof layer 3 at a pinpoint, the tension is unlikely to act on the absorbent layer 2 in the other region M2, and the fibers are not easily pulled to the joint 51. That is, the rigidity by joining of the absorption layer 2 and the leak-proof layer 3 is limited. As a result, the composite material 10 including the absorbent layer 2 and the leak-proof layer 3 is soft as a whole while realizing high bonding strength, and in particular, the above-described soft cushioning by the absorbent layer convex portions 21 and the space portions 41 is more effective. It will be something.

  As described above, as the joint portion 51 of the dome of the absorbent layer convex portion 21 and the base of the arch 81, it is difficult to peel off from the leak-proof layer 3 even when wet. 0.2 N / 10 mm or more is preferable, and 0.3 N / 10 mm or more is more preferable. Further, when wet, it is preferably 0.1 N / 10 mm or more, and more preferably 0.2 N / 10 mm or more. On the other hand, the upper limit thereof is preferably 3N / 10 mm or less, more preferably 1N / 10 mm or less during drying, from the viewpoint of suppressing the rigidity in the joint portion 51.

(Measuring method of bonding strength (peel strength))
The method for measuring the bonding strength described above is to cut out a laminated portion of the surface layer 1, the absorption layer 2 and the leak-proof layer 3 into a strip shape with a width of 30 mm and a length of 50 mm to obtain a test piece. After performing the predetermined pretreatment described later, in the environment of 20 ° C. and 65% RH, using the Tensilon tensile tester manufactured by Orientec Co., Ltd. The surface layer 1 is sandwiched between the chuck and the absorption layer 2 and the leak-proof layer 3 are sandwiched between the lower chuck. Thereafter, the film is peeled off in the 180 ° direction at a peeling speed of 300 mm / min, and the peeling strength is measured. The measurement result is divided by the width (mm) of the test piece to obtain the bonding strength (N / cm) per unit width.
For the adhesive strength in the dry state, the cut test piece is used for measurement as it is, while in the wet state, 5 cc of physiological saline is poured on the test piece and wetted sufficiently, and after 1 minute or more has passed, the paper towel is placed on the top surface. The light is pressed lightly from the (block-shaped absorbing portion 41) side to remove excess moisture, and the strength is measured in the same manner. N = 3 average is used for all measurements, and in particular, measurements in a wet state are devised so that they are put into measurement immediately after being wetted.

In the region M1, the absorption layer recess 22 is easy to collect excretion fluid and the like due to the high collection property as described above. Therefore, it is preferable to absorb and hold the liquid firmly in this portion.
From the viewpoint of this liquid absorption retention property, it is preferable that the fiber density of the hydrophilic fiber in the absorbent layer concave portion 22 is higher than the fiber density of the hydrophilic fiber in the absorbent layer convex portion 21. For example, as shown in FIG. 3, the fiber density is increased from the region P1 to P3 through P2. Due to the difference in fiber density of the hydrophilic fibers, the liquid received by the absorbent layer convex portion 21 from the surface layer 1 is easily drawn into the absorbent layer concave portion 22 by the capillary force acting on the absorbent layer concave portion 22 (arrow a1 in FIG. 3). . The liquid can be quickly absorbed and held with high liquid holding performance by the dense hydrophilic fibers in the absorbent layer recess 22. Furthermore, it is diffused on the non-skin contact surface side of the absorbent layer 2 through the space 41 of the region M2 adjacent to the absorbent layer recess 22, and can be quickly absorbed and held in a wide range of the absorbent layer 2. This makes it difficult for the excretory liquid to return to the surface layer 1. As a result, it is difficult for the excretory liquid to adhere to the skin, the stickiness of the skin is suppressed, and a good dry feeling can be obtained.

(Fiber density measurement method)
The fiber density can be measured by the following method.
The cut surface of the absorption layer 2 is enlarged and observed with a scanning electron microscope (the magnification (preferably 150 to 500 times) at which the fiber cross section can be measured 30 to 60), the number of cross sections of the fiber is measured, The number of cross-sections of the fibers cut by the cut surface is counted, converted to the number of cross-sections of fibers per 1 mm ² , and this is used as the fiber density (lines / mm ² ). JCM-5100 (trade name) manufactured by JEOL Ltd. can be used for the scanning electron microscope.

Furthermore, it is preferable that the constituent fibers of the absorbent layer recess 22 are not formed into a film and the space between the consolidated fibers is maintained (hereinafter, this portion is referred to as a fiber-consolidated fusion portion 24 (FIG. 3). Circle B enlarged sectional view)). Thereby, a liquid can be firmly absorbed and held between the hydrophilic fibers and the fibers. Space retention between fibers in the absorbent layer recess 22 having the joint portion 51 can be realized not by joining with an adhesive but by direct fusion joining of the fibers by the heat-fusibility of the heat-fusible fiber. Furthermore, it can be realized by heat fusion that is not formed into a film.
Originally, the absorbent layer 2 is a sheet body in which the fiber entanglement points 27 are bonded and the fiber feeling space is stably maintained. However, the embossing process for forming the joint 51 in the absorbent layer recess 22 reduces the distance between the fibers by heat fusion, that is, increases the fiber density. Still, the absorption retention of the liquid can be maintained by forming the fiber-consolidated fusion portion 24 without crushing the space between the fibers by forming an adhesive or a resin film. Rather, the absorption performance is enhanced by increasing the density. Thereby, reliable joining with high wet strength and good liquid retention can be achieved simultaneously. Moreover, the uneven | corrugated shape of the absorption layer 2 is maintained by reliable joining, and the sustainability of the above-mentioned effect | action is improved. And the excretion liquid is absorbed and held at a position far from the skin in the absorption layer 2, and the liquid return on the skin side is effectively suppressed. Furthermore, by maintaining the inter-fiber space in the joint portion 51, the rigidity at the portion is moderated as compared with film formation and the like, which contributes to improvement in softness and flexibility of the entire article.

  From the viewpoint of imparting high wet strength, the heat-sealing fiber 25 exhibiting these functions preferably has a content of 10% or more, more preferably 20% or more, in the entire absorbent layer 2. Further, the upper limit is preferably 50% or less, more preferably 40% or less from the viewpoint of the original liquid retention performance of the absorbent layer 2 in consideration of the balance with the hydrophilic fibers.

  As described above, the fineness of the heat-sealing fiber is preferably 1.2 dtex or more from the viewpoint of enhancing the fiber fusion property at the joint portion 51 and reliably fusing the fiber entanglement point of the absorbent layer 2, and preferably 2 dtex or more. More preferred. Further, the upper limit is preferably 7 dtex or less, more preferably 5 dtex or less, from the viewpoint of suppressing rigidity and preventing film formation to ensure a space between fibers. From the same viewpoint, the fiber length of the heat-sealing fiber is preferably 30 mm or more, and more preferably 50 mm or more. The upper limit is preferably 70 mm or less, and more preferably 60 mm or less.

<Regarding the space 41 in the region M2>
In the region M2, the non-skin contact surface side of the absorbent layer 2 and the skin contact surface side of the leak-proof layer 3 are not in close contact with each other due to the interposition of the space portion 41, and the liquid absorbed in the absorbent layer 2 evaporates. It is easy to be done. Moreover, since the non-skin contact surface side of the absorption layer 2 forms the arch 81, the surface area with respect to the space part 41 or the leak-proof layer 3 is large, and transpiration is easily promoted. The evaporated vapor is discharged to the outside air through the moisture-permeable leak-proof layer 3. Thereby, the transpiration | evaporation of the water | moisture content by the skin contact surface side is suppressed, and a stuffiness is reduced effectively. Moreover, due to the high shape stability of the absorbent layer 2 described above, even if the panty liner 30 is worn for a long time, it is difficult to give the wearer's skin a feeling of stuffiness.

  Due to the arrangement of the space portion 41, a part of the excretion fluid received from the surface layer 1 by the skin surface convex portion 21a of the absorption layer 2 is once taken into the space portion 41 on the non-skin surface concave portion 21b side. By interposing the space part 41, even when the excretion amount of the excretion liquid becomes large at a time, the space part 41 can temporarily hold the liquid and serve as a liquid absorption adjusting valve.

Further, the excretory fluid taken into the space 41 is diffused and taken into the joint portion 51 and the fiber consolidation / fusion portion 24 having a high fiber density. That is, the space portion 41 can diffuse the liquid between the absorption layer 2 and the leak-proof layer 3 and absorb and hold the liquid over a wide area of the absorption layer 2. Moreover, the below-mentioned ridge part 14 can connect the space parts 41 and can diffuse a liquid more effectively.
This liquid diffusion is further promoted by the unevenness on the skin contact surface side of the absorption layer 2. That is, as described above, the excretory fluid is likely to collect in the absorbent layer recess 22, and can be further drawn out to the space 41 and quickly diffused on the non-skin contact surface side of the absorbent layer 2. Thus, the liquid can be absorbed and held in a wide range on the non-skin contact surface side of the absorbent layer 2 through the space portion 41.

  As described above, the uneven shape of the absorption layer 2, the joint portion 51 in the region M <b> 1, and the space portion 41 in the region M <b> 2 act synergistically to prevent liquid diffusion on the skin contact surface side. The liquid is actively diffused and absorbed and retained on the non-skin contact surface side. Thereby, liquid residue and liquid return are prevented, and liquid absorption performance is further improved. In addition, as described above, since the uneven shape of the absorbent layer 2 is maintained even when wet, the sustainability of the liquid absorption performance is enhanced. As a result, liquid return to the surface layer 1 and liquid residue are suppressed, and a dry dry feeling is exhibited on the skin contact surface side, so that a good wearing feeling can be maintained. Thus, in the absorbent article of the present invention, the uneven shape of the absorbent layer 2 is provided with a function that a conventional sublayer or core wrap sheet bears. In other words, the present invention makes it possible to omit these conventional members, to suppress the manufacturing cost, and to provide a thinner and lighter absorbent article with good absorption performance.

As described above, the height (h6) of the absorbent layer convex portion 21 is preferably 1 mm or more, and more preferably 2 mm or more, from the viewpoint that the absorbent layer convex portion 21 softly contacts the skin and obtains excellent cushioning properties. The upper limit is preferably 10 mm or less, and more preferably 5 mm or less. Further, from the viewpoint of securing the space 41 for improving the liquid absorption performance, the height (h7) of the arch 81 of the non-skin surface recess 21b is preferably 0.5 mm or more, and more preferably 1 mm or more. The upper limit is preferably 8 mm or less, and more preferably 4 mm or less, from the viewpoint of the stability of the arch form. From the viewpoint of optimizing the volume of the space portion 41 in order to make the liquid diffusibility effective, the bottom area of the absorbent layer convex portion 21 is preferably 4 mm ² or more, and more preferably 9 mm ² or more. The upper limit is preferably 900 mm ² or less, 625 mm ² or less being more preferred.
In addition, as shown in FIG. 3, the height (h6) of the absorption layer convex portion 21 is from the lowest position on the non-skin contact surface side (non-skin surface convex portion 22b) of the absorbent layer concave portion 22 in the joint portion 51. This is the height to the top 21 t of the absorbent layer convex portion 21. Similarly, the height (h7) of the arch 81 is the height from the lowest position of the non-skin surface convex portion 22b to the portion of the non-skin surface concave portion 21b that is depressed most toward the skin contact surface side. Furthermore, the bottom area of the absorbent layer convex portion 21 is the size of the inner region defined by the joint portion 51 in the non-skin surface convex portion 22 b surrounding the absorbent layer convex portion 21.

<Planar shape of the joint 51>
Next, the planar shape of the joint portion 51 will be described with reference to FIGS.
The joint portion 51 is formed so as to coincide with the arrangement of the bottom top portions 22t of the absorption layer recesses 22. In the present embodiment, as shown in FIG. 4A, the joint portions 51 are arranged at equal intervals between the absorbent layer convex portions 21. More specifically, there are columns arranged at equal intervals in the Y direction, and these columns are regularly arranged at equal intervals in the X direction. Each of the joint portions 51 has a long shape that is long in the X direction. Thereby, the area of the joint portion 51 can be secured widely without changing the arrangement of the absorbent layer convex portions 21 in contact with the surface layer 1, which is preferable. Further, it is preferable that the area through which the liquid (arrow s1) that is slid down from the surrounding absorbent layer convex portion 21 to the bottom top portion 22t is transmitted to the absorbent layer can be ensured as wide as possible.
Ensuring such a large area of the joint 51 usually increases the rigidity of the absorbent article. However, in the present embodiment, as described above, since the rigidity of the joint portion 51 having high wet strength can be reduced by securing a space between fibers or the like, it is preferable because the rigidity of the entire absorbent article can be suppressed and a large area can be secured. .
The length (d) of the joint portion 51 is preferably 0.1 mm or more, and more preferably 0.3 mm or more. The upper limit is preferably 20 mm or less, and more preferably 10 mm or less. By setting it to the above lower limit or more, the heat absorption layer and the leak-proof layer are surely heat-melted, and there is no decrease in form stability due to the absorption layer peeling off from the leak-proof layer during wearing. It becomes possible to suppress a decrease in the texture of the absorption layer due to the bonding portion curing. Further, the width (e) of the joint portion 51 is preferably 0.1 mm or more, and more preferably 0.3 mm or more, for the same reason as described above. The upper limit is preferably 20 mm or less, and more preferably 10 mm or less. By setting it to the above lower limit or higher, the fixing property of the joint portion is improved, and by setting it to the upper limit or lower, it becomes easy to improve the feel of the leak-proof layer.

  In FIG. 4A, the lengths (d) of the joint portions 51 are all aligned in the X direction. Further, the present invention is not limited to this, and they may be aligned in the Y direction. For example, when the X direction is the longitudinal direction of the absorbent article and the Y direction is the width direction of the panty liner 30 (see FIG. 1), the longitudinal direction of the joint portion 51 is the longitudinal direction (X direction) of the absorbent article. If they coincide with each other, the absorption of the liquid and the diffusion of the liquid can be easily induced in the longitudinal direction (X direction) of the absorbent article, and the lateral leakage of the liquid can be suppressed. On the other hand, if the longitudinal direction of the joint portion 51 coincides with the width direction (Y direction) of the absorbent article, the absorbent article can be easily bent with the joint portion 51 as a base point, and the wearer's crotch or lower abdomen or the abdomen during wearing. This is preferable because it is easy to follow the buttock. These can be appropriately set according to the application.

Further, as shown in FIG. 4A, the arrangement of the joint portions 51 is such that the pitch of the joint portions 51 in each row is half between adjacent rows in order to ensure the uprightness of the absorbent layer convex portion 21. It is preferable that the pitch is shifted.
Furthermore, as shown in FIG. 4A, the planar arrangement of the bonding portion 51 and the absorption layer concave portion 22 that overlaps with the bonding portion 51 is not limited to the arrangement in which the four absorption layer concave portions 22 surround one absorption layer convex portion 21, and the unevenness is repeated. Arrangement can be set arbitrarily. For example, as shown in FIG. 4B, an arrangement in which six absorbent layer concave portions 22 and a joint portion 51 surround one absorbent layer convex portion 21 may be employed. In this case, two adjacent joint portions can be regarded as one component of the joint portion row as one set, and the row in which the constituent essential layers are arranged can be regarded as the joint portion row. That is, it can be regarded as a combination in which a horizontally long joint is divided into two. Further, as the planar shape of the joint portion 51 itself, a shape that can be taken as the joint portion, such as a circle, a triangle, a square, a polygon, an ellipse, a star shape, or the like can be arbitrarily adopted.

  In addition, as shown in FIGS. 4A and 4B, a ridge portion 14 that partitions the joint portions 51 and 51 and connects the absorbent layer convex portions 21 and 21 is disposed. The ridge portion 14 has a height that defines the absorbent layer recess 22. And it makes the channel | path which connects the space parts 41 and 41 inside the absorption layer convex part 21. FIG. In other words, the ridge portion 14 allows the liquid to move between the space portions 41, 41, and quickly diffuses the liquid between the absorption layer 2 and the leak-proof layer 3, so that the liquid can be quickly discharged over a wide area of the absorption layer 2. It can be absorbed and held (arrow S2 in FIG. 4A). Due to the presence of the ridge portion 14, the liquid regulating valve function or the liquid diffusion function by the space portion 41 can be made more effective. In addition, the presence of the ridge portion 14 enables air to move between the space portions 41 and 41 (arrow S2 in FIG. 4A), and even when crushed, it is deformed flexibly and can be easily recovered. This enhances the sustainability of a good cushion feeling.

[Second Embodiment]
Next, the panty liner 60 of the second embodiment will be described below with reference to FIG. The panty liner 60 is obtained by laminating and integrating the surface layer 9 formed with irregularities on the composite 10 of the absorbing layer 2 and the leak-proof layer 3 in the panty liner 30 of the first embodiment.
The uneven shape of the surface layer 9 is matched with the period of the uneven shape of the absorption layer 2. That is, the surface layer convex portion 91 and the absorbent layer convex portion 21 are arranged to overlap, and the surface layer concave portion 92 and the absorbent layer concave portion 22 are arranged to overlap. Moreover, the surface layer 9 and the absorption layer 2 are joined only at the joint 52 between the surface layer recess 92 and the absorption layer recess 22. On the other hand, the surface layer convex portion 91 and the absorption layer convex portion 21 are separated by the interposition of the gap portion 42. More specifically, the non-skin contact surface side of the surface layer convex portion 91 forms an arch 82 with respect to the absorbent layer convex portion 21.
As described above, the surface layer 1 and the absorption are obtained only at the joint portion 52 on the non-skin contact surface side (non-skin surface convex portion 92b) of the surface layer concave portion 92 that is connected in a plan view by connecting the arch 82 and the arch 82. Layer 2 is joined. In other words, the absorption layer 2 and the surface layer 1 are not in contact with each other, that is, not integrated.
In the surface layer 9, as in the absorbent layer 2, the surface layer convex portion 91 is composed of a skin surface convex portion 91a on the skin contact surface side and a non-skin surface concave portion 91b on the non-skin contact surface side. The surface layer recess 92 includes a skin surface recess 92a on the skin contact surface side and a non-skin surface protrusion 92b on the non-skin contact surface side.

  Thus, the surface layer convex part 91 is made to correspond to the absorber layer convex part 21, and the area which contacts a wearer's skin directly can be reduced effectively. Further, since the gap portion 42 is interposed, the thickness of the absorption layer 2 is not transmitted to the surface layer convex portion 91, and the work of compression can be freely deformed. Thereby, the soft touch when touching the skin is increased and a soft cushion feeling is obtained. And the surface layer convex part 91 and the absorption layer convex part 21 can be independently deform | transformed by presence of the space | gap part 42 and the space part 41, respectively. Thereby, a softer and more flexible deformation | transformation is possible, and a favorable wearing feeling is brought about.

  Particularly, the surface layer convex portion 91 receives pressure (white arrows f2 and f3 in FIG. 5) from multiple directions according to the wearer's movement together with the absorbent layer convex portion 21. Even in this case, the surface layer convex portion 91 is separated from the absorbent layer 2 due to the presence of the gap portion 42 while the arch 82 is maintained with respect to the absorbent layer 2 in the non-skin surface concave portion 91b on the basis of the joint portion 52. Easy to move (large compression work). And each of the surface layer convex portion 91 and the absorbent layer convex portion 21 can flexibly deform and follow the force from multiple directions. Therefore, rubbing with the skin that can be repelled by the skin convex portion 91a hardly occurs, and there is little friction. As a result, the feeling of touching the skin is soft and a gentle touch.

  Further, the gap portion 42 on the non-skin contact surface side of the surface layer convex portion 91 has a function as a liquid adjustment valve and a liquid diffusion function, like the space portion 41 of the absorption layer 2. That is, the panty liner 60 is provided with a double liquid regulating valve function and a liquid diffusion function. Thereby, a liquid can be taken in into the inside of the panty liner 60 more positively. Then, the liquid can be quickly absorbed and held by the absorption layer 2 without giving an opportunity for the liquid to diffuse in the surface layer 9. As a result, the dry feeling on the skin contact surface side of the surface layer 1 is further enhanced, and a good wearing feeling is obtained.

  On the other hand, the surface layer recess 92 forms a space with the skin and is excellent in air permeability. In addition, the surface layer concave portion 92 has a high ability to capture excretory fluid that flows down from the surrounding surface layer convex portion 91, and can effectively suppress the diffusion of the liquid on the skin contact surface side of the surface layer 4. This cooperates in synchronism with the transition of the liquid from the absorbent layer convex portion 21 to the absorbent layer concave portion 22 in the absorbent layer 2 described above, and can quickly absorb and hold the liquid away from the skin (arrows a1 and a2 in FIG. 5). ). Thereby, contact with skin and excretory fluid is controlled suitably, and a wearer's skin feels wet. A good wearing feeling is produced by these.

  Further, at the joint 52 between the surface layer recess 92 and the absorbent layer recess 22, an embossing process is performed, and the surface layer 1 and the absorbent layer 2 are joined. In the joint portion 52 of the present embodiment, the surface layer 9 and the absorbent layer 2 are fusion-bonded by thermal fusion of the heat-fusible fibers 25 in the absorbent layer 2 without using an adhesive or the like. As in the case of the absorption layer 2 described above, this fusion bonding is suitable for forming the surface layer 9 with a good concavo-convex shape, ensuring the voids 42, and retaining these forms. That is, the fusion bonding has a higher wet strength than the adhesive, similarly to the fusion bonding between the absorption layer 2 and the leak-proof layer 3. And since it can be fusion-bonded by a pinpoint, the formation of the arch 82 with respect to the absorption layer 2 in the surface layer convex part 91 will also become favorable. Even when wet while the panty liner 60 is used, the surface layer recess 92 and the absorbent layer recess 22 are difficult to peel off, the arch 82 based on this is held, and the gap 42 is also held. Thereby, the effect | action by the uneven | corrugated shape of the above-mentioned surface layer 9 can be sustained even when wet.

In addition, when the joining portion 52 is formed by heat fusion, the skin contact surface side of the absorbent layer convex portion 21 is not covered with an adhesive film, so that the liquid absorption retention of the absorbent layer 2 is not hindered. preferable.
On the other hand, in the surface layer recess 92 and the absorbent layer 22 that have been subjected to the embossing treatment, it is preferable that the space between the fibers is maintained while avoiding film formation. Further, the fiber density is preferably increased from the surface layer convex portion 91 to the surface layer concave portion 92. Thereby, the liquid permeability to the absorption layer and the liquid retention in the absorption layer are enhanced in addition to the liquid collection property described above. For example, as shown in FIG. 5, in the surface layer 9 that is not on the skin contact surface side of the surface layer 9, the liquid is transmitted from the region P11 to P13 through P12 (arrow a2 in FIG. 5), and from there The liquid is quickly delivered to the absorbent layer recess 22 and quickly absorbed and held. Further, as described above, it can diffuse on the non-skin contact surface side of the absorbent layer 2 through the space 41 and can be absorbed and held in a wide range of the absorbent layer 2.

  In order to make the above action more effective, the skin surface convex portion 91a of the surface layer 9 is changed from the skin surface concave portion 92a of the surface layer 9 to the skin contact surface from the viewpoint of reducing the contact area with the skin. It is preferably a dome shape that protrudes to the side and has a top 91t. Moreover, it is preferable that the skin surface recessed part 92a of the surface layer 9 is a hollow shape which reaches from the several skin surface convex part 91a of the periphery to the bottom part top part 92t from a liquid capture property viewpoint. For example, a conical shape, a truncated cone, an elliptical cone, an inverted elliptical truncated cone shape, a mortar shape or a bowl shape, and the like, are preferred to have a shape that converges to the bottom top portion 92t.

As described above, as the joint 52 at the base of the dome 82 of the surface layer convex portion 91 and the arch 82, in order to make it difficult to peel off from the absorbent layer concave portion 22 even when wet, the joint strength (peel strength) is 0.3 N / 10 mm or more is preferable, and 0.5 N / 10 mm or more is more preferable. Further, when wet, it is preferably 0.1 N / 10 mm or more, and more preferably 0.4 N / 10 mm or more. On the other hand, the upper limit is preferably 3 N / 10 mm or less, more preferably 1 N / 10 mm or less during drying, from the viewpoint of suppressing the rigidity in the joint portion 52.
These bonding strengths can be measured by the same measurement method as the bonding strength of the bonding portion 51 in the absorption layer 2 described above.

As described above, the height (h11) of the surface layer protrusion 91 is preferably 1 mm or more, and more preferably 2 mm or more, from the viewpoint that the surface layer protrusion 91 softly contacts the skin and obtains excellent cushioning properties. The upper limit is preferably 10 mm or less, and more preferably 5 mm or less. Further, from the viewpoint of securing the gap 42 that improves the liquid absorption performance, the height (h14) of the absorption layer convex portion 21 among the height (h12) of the arch 82 of the non-skin surface concave portion 91b of the surface layer 9 (H15 = h12−h6, hereinafter referred to as the height of the gap 42) is preferably 0.1 mm or more, and more preferably 0.3 mm or more. The upper limit is preferably 10 mm or less, and more preferably 5 mm or less, from the viewpoint of the form stability of the surface layer convex portion 91. From the viewpoint of optimizing the spread of the gap portion 42 in order to make the liquid diffusibility effective, the bottom area of the surface layer convex portion 91 is preferably 4 mm ² or more, and more preferably 9 mm ² or more. The upper limit is preferably 900 mm ² or less, 625 mm ² or less being more preferred.
Furthermore, from the viewpoint of improving the liquid absorption performance by the gap 42, the ratio (h15 / h11) of the height (h15) of the gap 42 to the height (h11) of the surface layer protrusion 91 is 1/20 or more. Is preferable, and 1/10 or more is more preferable. On the other hand, from the viewpoint of maintaining the shape of the superior cushioning surface layer convex portion 91, it is preferably 1/2 or less, and more preferably 1/3 or less.
As shown in FIG. 5, the height (h11) of the surface layer convex portion 91 is from the lowest position on the non-skin contact surface side (non-skin surface convex portion 92b) of the surface layer concave portion 92 in the joint portion 52. It is the height to the top part 91t of the surface layer convex part 91. Similarly, the height (h12) of the arch 82 is the height from the lowest position of the non-skin surface convex portion 92b of the surface layer 9 to the portion of the non-skin surface concave portion 91b that is depressed most toward the skin contact surface side. is there. Of the height (h12) of the arch 82, the intrusion height (h14) of the absorbent layer convex portion 21 is from the lowest position of the non-skin surface convex portion 92b of the surface layer 9 to the top portion 21t of the absorbent layer convex portion 21. It is height. Furthermore, the bottom area of the surface layer convex portion 91 is the size of the inner region defined by the joint portion 52 in the non-skin surface convex portion 92 b surrounding the surface layer convex portion 91.

  In order to ensure the height of the surface layer convex portion 91 and the height of the arch 82, it is preferable that the surface layer 9 contains heat-stretched fibers. This heat-stretched fiber is a fiber obtained by heat-stretching the heat-stretchable fiber before heat-stretching contained in the member to be the surface layer 9 by hot air treatment in forming the panty liner 60. By performing the expression of this heat stretchability in the middle of the process of forming the panty liner 60 after forming the joint portion 52, the constituent fibers in the surface layer 9 are driven to the skin contact surface side, and as a result, the absorption layer convexity The dome shape of the convex surface layer convex part 91 and the arch 82 are formed by increasing the distance from the part 21. Further, due to this thermal extension, the inter-fiber distance is widened in the surface layer convex portion 91, particularly the apex portion 91t, and the bulky state is obtained. Thus, the fiber density gradient from the surface layer convex portion 91 to the surface layer concave portion 92 becomes more clear, which is preferable.

[Third Embodiment]
Next, the panty liner 90 of the third embodiment will be described below with reference to FIG. The panty liner 90 is the composite 10 of the absorbent layer 2 and the leak-proof layer 3 in the panty liner 30 of the first embodiment or the panty liner 60 of the second embodiment. It consists of two layers. Thereby, an outer touch and a texture become soft. Moreover, even when the absorption layer 2 contains a highly water-absorbing polymer or other functional particles, it is preferable that the leakage prevention layer 3 prevents the leakage.

Next, a preferable aspect as a manufacturing method of the absorbent article of this invention is demonstrated in detail, referring FIGS. However, the production method of the present invention is not construed as being limited thereby.
FIG. 7 is a process explanatory view schematically showing a part of the process of the manufacturing method of the present invention. First, the upper layer 200, which is an absorbent layer sheet, is fed out in the direction of an arrow 49a from a raw fabric roll (not shown). A lower layer 300 that is a leak-proof layer precursor is fed out in the direction of an arrow 49e from another raw roll (not shown). The upper layer 200 is a continuous sheet body in which the entanglement points of constituent fibers such as hydrophilic fibers are fused by the heat-fusibility of the heat-fusible fibers 25 during conveyance. However, since the heat-sealable fiber 25 at this time is a post-process for forming a joint portion, there remains room for heat-sealability to be developed by further heat treatment. On the other hand, at least the surface of the lower layer 300 facing the upper layer 200 has a hot-melt material.

  Next, the rolled-up upper layer 200 is surrounded by a first roll 401 (embossing roll having a concavo-convex pattern) 401 having a concavo-convex circumferential surface and a concavo-convex shape meshing with the concavo-convex shape of the first roll. It conveys to the meshing part with the 2nd roll 402 which has on the surface. The sheet member of the upper layer 200 is caught and held in the meshing portion, and the absorbent layer concave portion 22 and the absorbent layer convex portion 21 are shaped.

FIG. 8 shows a partially enlarged perspective view of the first roll 401. The first roll 401 is a roll formed by combining a plurality of spur gears 401a, 401b,... Having a predetermined tooth width. The tooth width of each gear is preferably determined according to the interval between the convex portions of the desired absorbent layer. In this embodiment, adjacent gears are combined so that the pitch of their teeth is shifted by half a pitch.
A suction hole 403 is formed in the tooth groove portion of each gear in the first roll 401. The tooth groove portion corresponds to a concave portion of the concave and convex shape on the peripheral surface of the first roll 401. The suction hole 403 communicates with a suction source (not shown) such as a blower or a vacuum pump, and as shown in FIG. 8, the first roll 401 (rotation direction: arrow 49c) and the second roll 402 (rotation direction: arrow 49b). ) And the joining portion 46 of the upper layer 200 and the lower layer 300 are controlled to be sucked. Therefore, the upper layer 200 that is unevenly shaped by the engagement of the first roll and the second roll is brought into close contact with the peripheral surface of the first roll 401 by the suction force by the suction holes 403, and the uneven shape is maintained. . In this case, as shown in FIG. 8, if a predetermined gap G is provided between adjacent gears, the upper layer 200 is formed in the upper layer 200 without applying an excessive stretching force or a cutting effect due to the uneven engagement of the rolls. It is brought into close contact with the peripheral surface of the roll 401. The gap G depends on the total tooth depth of the gear and the basis weight of the upper layer 200. However, since the adhesion can be performed without breaking or damaging the upper layer 200, 0.1 to 50 mm is preferable, and about 0.1 to 5 mm. Is more preferable.

  Next, as shown in FIG. 7, the upper layer 200 is kept in close contact with the peripheral surface of the first roll 401, and the lower layer 300 separately fed out at the junction 46 is superposed, and the superposed one is obtained. Clamping is performed between the first roll 401 and the anvil roll 404 (rotation direction: arrow 49d), and the composite continuous body 100 is obtained in the direction of the arrow 49f. The vicinity of the merging portion 46 is shown as a partially enlarged cross-sectional view in FIG.

As shown in FIG. 9, in the convex part (tooth tip of each gear) 401p of the first roll 401, the upper layer 200 and the lower layer 300 are compressed and thermally fused by the heat of the convex part 401p. At that time, the heat-fusibility of the upper-layer heat-fusible fiber 25 and the heat-fusibility of the heat-welding material disposed on the upper surface side of the lower layer are manifested. As a result, the constituent fibers of the upper layer 200 are welded or fused to the lower layer hot melt material and fixed. Thereby, the joint part 51 is formed. Further, the constituent fibers are consolidated in the upper layer 200 by the compression by the convex portions 401p, and the fiber-consolidated fused portion 24 is formed. On the other hand, in the region where the joint portion 51 and the fiber consolidation portion 24 are not formed, a space portion 41 is formed between the upper layer 200 and the lower layer 300 that are depressed along the concave portion 401q of the first roll 401. Both layers are unbonded.
Moreover, in this embodiment, the joining process of the upper layer 200 and the lower layer 300, and the formation process of the fiber consolidation part 24 in the upper layer 200 are performed by one process. That is, a necessary part can be suitably heated only by pressure bonding by the convex portion 401p of the first roll 401. Thereby, the complexity by the increase in the number of processes and extra fiber fusion can be prevented, and the texture of the upper layer 200 and the lower layer 300 is not hindered. In this respect, the manufacturing method of the present embodiment is preferable.

Then, in the manufacturing method of the absorbent article of this invention, what united the upper layer (absorbing layer sheet) 200 and the lower layer (leakproof layer sheet) 300 is made into the composite continuous body 100. A sheet continuum of the surface layer is laminated on the upper layer side of the composite continuum 100 and bonded. Then, it cuts out to a predetermined size. Thereby, for example, the configuration of the absorbent article provided with the surface layer, the absorption layer, and the leak-proof layer as shown in FIG. 1 is obtained.
Thus, according to the production method of the present invention, an excellent liquid absorption function and a soft soft feeling can be given to the composite used in the absorbent article. Specifically, for example, an absorbent article that can exhibit an excellent function as in the above-described embodiment can be efficiently manufactured in a continuous process.

  Further, although not shown, the surface layer can be laminated as the surface layer 9 formed with unevenness as in the second embodiment. The uneven forming of the surface layer 9 can be formed in the same manner as the forming method of the upper layer 200 which is the above-mentioned sheet for absorbing layer. At this time, the surface layer and the absorbent layer may be shaped separately and laminated in the above-described steps. In this case, when shaping the sheet continuous body 900 to be the surface layer 9, the gear having a height higher than the convex portion 401 p of the roll used in the upper layer 200 in consideration of the gap 42 between the absorbent layer 2. Is preferably used. In this case, the sheet continuous body 900 is laminated and bonded to the composite continuous body 100 described above. Then, the hot air process mentioned later is performed.

Or you may make it make uneven | corrugated shape in the state which laminated | stacked the sheet | seat continuous body 900 and the upper layer 200. FIG. In this case, it is preferable not to apply heat to the concave portion 401q of the first roll 401 so that the two sheets are not fused. That is, it is preferable to apply heat only to the convex portion (tooth tip of each gear) 401p. Then, the stacked continuous body is joined to the lower layer 300 and is fusion-bonded to the lower layer 300 only by 401 p of the first roll 401. Thereby, the joint part 51 and the joint part 52 are formed simultaneously.
In order to form the gap 42, it is preferable that the sheet continuum 900 to be the surface layer 9 contains the heat extensibility before the heat extensibility is expressed. In addition, also in the method of separately shaping the sheet continuous body 900 and the upper layer 200 described above, it is preferable that the sheet continuous body 900 contains a heat-extensible fiber in order to form a favorable gap portion 42.

  Next, although not shown in the drawing, hot air is blown from the sheet continuous body 900 side to the laminated body of the sheet continuous body 900, the upper layer 200, and the lower layer 300 to perform hot air recovery treatment of the fibers. In this hot-air recovery treatment, the bulk of the nonwoven fabric fibers of the sheet continuous body 900 is recovered, and the heat-bonding properties of the heat-bonding fibers 25 of the sheet continuous body 900 on the skin contact surface side other than the joint portion 52. Is expressed. Thereby, in parts other than the junction part 52, a heat | fever extensible fiber expand | extends, the arch 82 with respect to the absorption layer convex part 21 is formed, and the favorable space | gap part 42 is ensured.

  Next, the preferable forming material of the member used for the absorbent article of the present invention will be described.

  As a material for forming the surface layer 1, the absorption layer 2, and the leak-proof layer 3, those employed for this type of article can be used without particular limitation.

  For example, the surface layer 1 is preferably a hydrophilic thermal bond nonwoven fabric from the viewpoint of promptly absorbing excreted bodily fluid and transmitting it to the absorbent body and from the viewpoint of good touch, and particularly preferably an air-through nonwoven fabric. The surface layer 1 is preferably a thermoplastic resin fiber that has been subjected to a hydrophilic treatment, and the fiber is a fiber that has undergone a three-dimensional crimp such as a secondary crimp or a tertiary crimp. Specifically, polyethylene, polypropylene, polyester, nylon, and composite fibers thereof are prepared, and various hydrophilizing agents are applied at a stage before cutting into a predetermined length to form staples. Hydrophilic agents include various alkyl sulfonates represented by α-olefin sulfonates, acrylates, acrylate / acrylamide copolymers, ester amides, ester amide salts, polyethylene glycol and derivatives thereof, water-soluble Hydrophilic treatment with a hydrophilizing agent known to those skilled in the art, such as a reactive polyester resin, various silicone derivatives, various sugar derivatives, and mixtures thereof, can be used.

  The leak-proof layer 3 is not particularly limited as long as it has waterproofness and moisture permeability, but for example, a hydrophobic inorganic resin and a minute inorganic filler made of calcium carbonate or the like, or an organic high compatibility material. Examples include a porous film obtained by melt-kneading molecules and the like to form a film, and uniaxially or biaxially stretching the film. Examples of the thermoplastic resin include polyolefin. Examples of the polyolefin include high to low density polyethylene, linear low density polyethylene, polypropylene, polybutene and the like, and these can be used alone or in combination.

  As the heat-fusible fiber in the absorbent layer 2, those used for this type of article can be used arbitrarily. Examples thereof include polyethylene fibers, polypropylene fibers, polyethylene terephthalate fibers, and polyamide fibers. A core-sheath type composite fiber or a side-by-side type composite fiber can also be used.

  The constituent material of the absorbent layer 2 other than the heat-sealing fibers includes hydrophilic fibers, a mixture of the hydrophilic fibers and superabsorbent polymer particles, or hydrophilic fibers, superabsorbent polymer particles and thermoplastic synthetic resin fibers. And a mixture thereof. As the hydrophilic fiber, a fiber having a hydrophilic surface can be used. For example, a synthetic fiber such as natural pulp fiber or rayon fiber, which has been subjected to a hydrophilic treatment with a surfactant or the like as necessary, can be mentioned. Specific examples include natural cellulose fibers such as wood pulp, cotton pulp, and straw pulp, regenerated cellulose fibers such as rayon and cupra, and hydrophilic synthetic fibers such as polyvinyl alcohol fibers and polyacrylonitrile fibers. And may be combined. As the polymer particles, starch-based, cellulose-based or synthetic polymer-based particles can be used.

Furthermore, the thermally stretched fiber before the thermally stretched fiber contained in the surface layer 9 is thermally stretched will be described. As the heat-extensible fiber, a material used for this type of article can be arbitrarily adopted. For example, a core-sheath type composite fiber that spontaneously extends as the crystal state of the resin changes by heating can be used. A preferable heat-extensible fiber is composed of a first resin component and a second resin component having a melting point or softening point lower than the melting point of the first resin component.
A 1st resin component is a component which expresses the heat | fever extensibility of this fiber, and a 2nd resin component is a component which expresses heat-fusibility. Bicomponent composite fibers in which the second resin component is present at least partially on the fiber surface in the length direction are preferred. There are various forms of the composite fiber such as a core-sheath type and a side-by-side type, and any form is included in the present invention. In the case of the core-sheath type, it is preferable that the first resin component is a core part and the second resin component is a sheath part.
The heat-extensible fiber used in the present invention can be thermally stretched by heat at a temperature lower than the melting point of the first resin component and at a temperature lower than the temperature at which the heat-fusibility of the second resin component is exhibited. Is preferable.

Hereinafter, the first resin component and the second resin component will be described in more detail.
As a preferable combination of the first resin component and the second resin component, as the second resin component when the first resin component is polypropylene (PP), high-density polyethylene (HDPE), low-density polyethylene (LDPE), Examples thereof include polyethylene such as linear low density polyethylene (LLDPE), ethylene propylene copolymer, and polystyrene. In addition, when a polyester resin such as polyethylene terephthalate (PET) or polybutylene terephthalate (PBT) is used as the first resin component, in addition to the example of the second resin component described above, polypropylene (PP ) And copolyesters. Furthermore, examples of the first resin component include polyamide-based polymers and two or more types of copolymers of the first resin component described above, and examples of the second resin component include two or more types of the second resin component described above. Copolymers are also included. These are appropriately combined.

  A particularly preferred combination of the first resin component and the second resin component is a combination in which the first resin component is polypropylene and the second resin component is polyethylene, particularly high-density polyethylene. This is because the non-woven fabric can be easily manufactured because the difference in melting point between both resin components is in the range of 20 to 40 ° C. In addition, since the specific gravity of the fiber is low, a nonwoven fabric that is lightweight and excellent in cost and can be incinerated and discarded with a low heat quantity is obtained. Further, by using this combination, the heat stretchability of the heat stretchable conjugate fiber is also increased. The reason is considered as follows. In said heat extensible composite fiber, the orientation coefficient of the 1st resin component is restrained in the specific range, and the orientation coefficient of the 2nd resin component is raised. Polyethylene, which is the second resin component, particularly high-density polyethylene, has high crystallinity. Therefore, until the heat-extensible composite fiber is heated and the temperature reaches the melting point of polyethylene, the heat elongation of the fiber is restrained by the polyethylene. When the fiber is heated to the melting point of polyethylene or higher, the polyethylene begins to melt and the constraint is released, so that the first resin component, polypropylene, can be stretched, and the entire fiber is thought to stretch.

A preferable combination of polypropylene and polyethylene is preferably the following (1), particularly (2). By adopting such a combination, the polyethylene as the second resin component is easily oriented during melt spinning, the crystallinity thereof is increased, and the polypropylene of the first resin component is appropriately oriented, so that the fiber Increases thermal extensibility.
(1) Polypropylene having a melt flow rate (hereinafter also referred to as MFR) of 10 to 35 g / 10 min and a Q value of 2.5 to 4.0 is used, and polyethylene has an MFR of 8 to 30 g. A combination using a Q value of 4.0 to 7.0 at / 10 min.
(2) Polypropylene having an MFR of 12 to 30 g / 10 min and a Q value of 3.0 to 3.5 is used, and polyethylene has an MFR of 10 to 25 g / 10 min and a Q value of 4 Combinations using .5 to 6.0.

  The MFR of polypropylene is measured at a temperature of 230 ° C. and a load of 2.16 kg according to JISK7210. Similarly, the MFR of polyethylene is measured according to JISK7210 at a temperature of 190 ° C. and a load of 2.16 kg.

The melting point of the first resin component and the second resin component was determined by using a differential scanning thermal analyzer DSC-50 (manufactured by Shimadzu Corporation) and performing thermal analysis of a finely cut fiber sample (sample mass 2 mg) at a heating rate of 10 ° C. / The melting peak temperature of each resin is measured and defined by the melting peak temperature.
When the melting point of the second resin component cannot be clearly measured by this method, the temperature at which the second resin component is fused to such an extent that the fiber fusion point strength can be measured as the temperature at which the second resin component begins to flow. Is the softening point.

The ratio (weight ratio) between the first resin component and the second resin component in the heat-extensible conjugate fiber is preferably 10:90 to 90: 10%, particularly 30:70 to 70: 30%. Within this range, the mechanical properties of the fiber are sufficient, and the fiber can withstand practical use. Further, the amount of the fusion component is sufficient, and the fibers are sufficiently fused. An appropriate value is selected as the thickness of the heat-extensible conjugate fiber depending on the specific use of the conjugate fiber. A general range is 1.0 to 10 dtex, particularly 1.7 to 8 dtex, from the viewpoints of fiber spinnability and cost, card machine passability, productivity, cost, and the like.
As the thermally extensible fiber, for example, those described in Japanese Patent Application No. 2005-353780 can be used.

  This invention discloses the following absorbent articles and its manufacturing method further regarding embodiment mentioned above.

<1> An absorbent article having a leak-proof layer and an absorbent layer disposed on the skin contact surface side of the leak-proof layer, wherein the absorbent layer has heat-sealing fibers and hydrophilic fibers, It is a sheet body in which constituent fibers are joined at an entanglement point, and the absorbent layer has a plurality of absorbent layer convex portions formed integrally in the thickness direction on the skin contact surface side and the non-skin contact surface side, and It has an absorbent layer concave portion, and the absorbent layer convex portion and the absorbent layer concave portion are alternately adjacently arranged in different directions intersecting in plan view to form an uneven shape, and the non-skin contact surface side of the absorbent layer convex portion is An arch is formed, and a space is disposed between the leak-proof layer, and the anti-shock layer is disposed only on the non-skin contact surface side of the absorbent layer recesses dispersed in a plan view connecting the arch and the arch. A joining portion with the leaking layer is disposed, and in the joining portion, the absorption layer and the above-mentioned by the heat-fusibility of the heat-sealing fiber. Leakage layer and is bonded fused, in the space portion, the absorbent article means for bonding the leakproof layer and the absorbent layer is not present.

<2> The skin contact surface side of the leak-proof layer is made of a heat-meltable material, and the melting point difference between the heat-fusible fiber of the absorption layer and the heat-meltable material of the leak-proof layer is within 20 ° C. The absorbent article as described in>.
<3> The <1> or the above, wherein the skin contact surface side of the leak-proof layer is made of a heat-meltable material, and the melting point of the heat-sealing fiber of the absorption layer is equal to or lower than the melting point of the heat-meltable material of the leak-proof layer. The absorbent article as described in <2>.
<4> The absorbent article according to any one of <1> to <3>, wherein the leak-proof layer has moisture permeability.
<5> The absorbent article according to any one of <1> to <4>, wherein the absorbent layer concave portion has a higher fiber density of hydrophilic fibers than the absorbent layer convex portion.
<6> The non-skin contact surface side of the absorbent layer has a higher content of the heat-fusible fiber than the skin contact surface side of the absorbent layer. <1> to <5> Absorbent article.
<7> The absorbent article according to any one of <1> to <6>, wherein an inter-fiber space of the constituent fibers is retained in the absorbent layer recess.
<8> The skin contact surface side of the absorbent layer convex portion has a dome shape having a top portion, and the skin contact surface side of the absorbent layer concave portion is a bottom top portion from the plurality of absorbent layer convex portions surrounding the absorbent layer concave portion. Absorbent article as described in any one of <1>-<6> which is the hollow shape which reaches to the bottom.
<9> The absorbent layer convex portion has a height of 1 to 10 mm and a bottom area of 4 to 900 mm ² , the individual joint portions are rectangular, and the longitudinal direction of each of the absorbent articles. <1> to <8> according to any one of <1> to <8>, wherein the rectangular shape has a length of 0.1 to 20 mm and a width of 0.1 to 20 mm. Absorbent article.
<10> The joint portion between the absorbent layer and the leak-proof layer has a row arranged at equal intervals in the longitudinal direction of the absorbent article, and the row is arranged in a plurality of rows in the width direction. The absorbent article according to any one of <1> to <9>, wherein the rows of the parts are arranged so as to be shifted by a half pitch from the adjacent rows.
<11> The absorbent article according to any one of claims 1 to 10, wherein the absorbent layer contains a superabsorbent polymer.
<12> The absorbent article has a liquid-permeable surface layer on the skin contact surface side of the absorbent layer, and the surface layer integrally forms the skin contact surface side and the non-skin contact surface side. It has a plurality of surface layer convex portions and surface layer concave portions shaped in the thickness direction, and the surface layer convex portions and the surface layer concave portions are arranged alternately adjacent to each other in different directions intersecting in plan view to form an uneven shape. The surface layer recess is fusion bonded in the absorption layer recess, and the surface layer is not bonded to the absorption layer except for the surface layer recess, and the non-skin contact surface side of the surface layer protrusion is The absorbent article according to any one of <1> to <11>, wherein an arch is formed without being joined to the absorbent layer, and a gap is disposed between the convex portion of the absorbent layer.
<13> The absorption according to <12>, wherein the surface layer includes heat-stretched fibers, and the void portion is formed by a bulge toward the skin contact surface side of the surface layer due to heat stretching of the heat-stretched fibers. Sex goods.
<14> A meshing portion between a first roll having a concavo-convex shape on the peripheral surface and a second roll having a concavo-convex shape meshing with the concavo-convex shape of the first roll on the peripheral surface A step of conveying and sandwiching an absorbent layer sheet member containing heat-sealing fibers, and forming a plurality of concave portions and convex portions on the absorbent layer sheet member, and the absorbent layer sheet member after the shaping In a state where the absorbent layer sheet member is brought into intimate contact with the peripheral surface of the first roll, the leak-proof layer sheet member conveyed separately only at the convex portion of the first roll, And a step of fusing the sheet member for the absorbent layer and the sheet member for the leak-proof layer at the contact portion to form a composite sheet member.
<15> The method for manufacturing an absorbent article according to <14>, wherein the heat treatment is based on heat applied to the convex portion of the first roll.
<16> The sheet member for the surface layer containing the heat-extensible fiber is laminated on the side of the sheet member for the absorption layer of the composite sheet member, and the sheet member for the surface layer is bonded to the sheet member for the absorption layer. A step of bonding only at the fusion-bonded portion with the leak-proof layer sheet member, and heat-treating the surface layer sheet member after bonding, and at the non-bonded portion with the absorbent layer sheet member, <14> or <15 including a step of forming a arch of a convex portion by causing the surface layer sheet to be raised by exhibiting thermal extensibility and forming a void portion with the absorbent layer sheet member. > The manufacturing method of the absorbent article of description.

DESCRIPTION OF SYMBOLS 1 Surface layer 11 Surface layer convex part 12 Surface layer recessed part 2 Absorbing layer 21 Absorbing layer convex part 22 Absorbing layer recessed part 25 Thermal fusion fiber 26 Hydrophilic fiber 27 Fiber entanglement point 3 Leak-proof layer 41 Space part 42 Cavity part 51, 52 Junction portions 81, 82 Arch 9 Surface layer 91 Surface layer convex portion 92 Surface layer concave portion 10 Composite 30, 60, 90 Panty liner 200 Upper layer (surface layer sheet)
300 Lower layer (absorbent layer sheet)
401 First roll (embossing roll)
401p convex portion 401q of first roll concave portion 402 of first roll 402 second roll (meshing roll)
404 Anvil Roll

Claims (7)

An absorbent article having a leak-proof layer and an absorbent layer disposed on the skin contact surface side of the leak-proof layer,
The absorbent layer is a sheet body having heat-fusible fibers and hydrophilic fibers, in which constituent fibers are joined at an entanglement point,
The absorbent layer is the skin contact surface side and the non-skin contact surface side has a integrally multiple absorbent layers which are shaped in the thickness direction the convex portions and the absorbing layer recesses, the absorbent layer peaks and absorption The layer recesses are arranged alternately adjacent in different directions intersecting in plan view to form an uneven shape,
The non-skin facing side of the absorbent layer projections to name the arch, the absorber layer space portion is arranged, which is viewed distributed connecting the arches and arch between the leakproof layer Only at the non-skin contact surface side of the recess, a joint portion with the leak-proof layer is disposed, and at the joint portion, the absorption layer and the leak-proof layer are formed by the heat-fusibility of the heat-sealing fiber. The layer is fusion bonded, and in the space portion, there is no means for bonding the absorption layer and the leak-proof layer ,
An absorbent article in which the absorbent layer concave portion has a higher fiber density of hydrophilic fibers than the absorbent layer convex portion . Non-skin facing side, the absorbent article of the content of the heat-fusible fibers than the skin contact surface side of the absorbent layer is higher Claim 1 Symbol placement of the absorbent layer. The skin contact surface side of the absorbent layer convex portion has a dome shape having a top portion, and the skin contact surface side of the absorbent layer concave portion extends from the plurality of absorbent layer convex portions surrounding the absorbent layer concave portion to the bottom top portion. The absorbent article according to claim 1 or 2 , which has a hollow shape. The joint portion between the absorbent layer and the leak-proof layer forms a row arranged at equal intervals in the longitudinal direction of the absorbent article, and the row is arranged in a plurality of rows in the width direction. The absorptive article given in any 1 paragraph of Claims 1-3 made into the arrangement which shifted half pitch with the adjacent row. The absorbent article has a liquid-permeable surface layer on the skin contact surface side of the absorbent layer,
The surface layer, the skin contact surface side and the non-skin contact surface side has a integrally projecting plural surface layers shaped in the thickness direction portion and the surface layer recesses, the surface layer projecting portion and the surface Layer recesses are alternately arranged adjacent to each other in different directions intersecting in plan view to form an uneven shape, and the surface layer recesses are fusion-bonded in the absorption layer recesses, and the surface layer is other than the surface layer recesses in not joined to the absorbent layer, the non-skin contact surface side of the surface layer projections to name an arch without being bonded to the absorbent layer, the gap portion between the convex portion of the absorbent layer The absorptive article according to any one of claims 1 to 4 arranged. The surface layer includes heat-stretched fibers, and the void portion includes the heat-stretched fibers and the surface layer convex portions that protrude on the skin contact surface side of the surface layer, and the convex portions of the absorbent layer. the absorbent article of claim 5, wherein Ru mania. In the meshing portion between the first roll having a concavo-convex shape on the peripheral surface and the second roll having a concavo-convex shape meshing with the concavo-convex shape of the first roll, A step of conveying and sandwiching the absorbent layer sheet member containing the attached fibers, and forming a plurality of concave portions and convex portions on the absorbent layer sheet member, and
A leak-proof layer in which the absorbent layer sheet member is conveyed separately only at the convex portion of the first roll in a state where the molded absorbent layer sheet member is in close contact with the peripheral surface of the first roll. Contacting the sheet member for heat treatment, and fusing the sheet member for the absorption layer and the sheet member for the leak-proof layer by the heat treatment to form a composite sheet member;
A sheet member for a surface layer containing a heat-extensible fiber is laminated on the side of the sheet member for the absorption layer of the composite sheet member, and the sheet member for the surface layer is used as the leakage preventing layer of the sheet member for the absorption layer. The process of joining only at the fusion part with the sheet member for use,
The surface layer sheet member after the bonding is heat-treated, and the surface layer sheet is raised by causing the heat stretchable fiber to exhibit thermal extensibility in a non-bonded portion with the absorbent layer sheet member. Forming a gap between the absorbent layer sheet member by forming an arch of the absorbent portion and a method for producing an absorbent article.

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