JP6580420B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article.

  In absorbent articles such as incontinence pads and sanitary napkins, it is widely known that a nonwoven fabric having a concavo-convex structure is used as a surface sheet for forming a skin contact surface from the viewpoint of improving liquid return prevention and anti-dampness. ing. In addition, from the viewpoint of preventing side leakage, it is also known to provide a leak-proof cuff on both sides in the longitudinal direction. An elastic member is fixed to the leak-proof cuff in a stretched state in order to increase its standing property. It is common (refer patent documents 1-3).

JP 2011-67563 A JP 2013-17530 A JP 2014-94200 A

  However, the leak-proof cuff with the elastic member in the stretched state makes it easier for the wearer to feel the leak-proof cuff hitting the skin while trying to enhance the side-leakage prevention effect. In order to reduce, there is a possibility that the effect of preventing side leakage is lowered.

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

  The present invention is an absorbent article comprising a liquid-permeable surface sheet that forms a skin contact surface, a back sheet that forms a non-skin contact surface, and an absorbent body interposed between the two sheets. The top sheet has an uneven region having a plurality of convex portions protruding toward the skin side and concave portions located between the plurality of convex portions at least in a central region in the width direction of the absorbent article, and absorbing the surface sheet. The adhesive article has a side region where the skin contact surface side of the top sheet is covered with a liquid-impermeable side sheet on both sides of the central region, and the side sheet has the side region The absorbent article is formed by the side sheet and the height of the skin contact surface in the central region formed by the uneven region of the surface sheet. The height of the skin contact surface of the side region is the same, There is provided a Osamusei article.

  According to the absorbent article of the present invention, it is difficult for the wearer to feel that the side sheet is touched or uncomfortable, and the side leakage prevention effect is also excellent.

FIG. 1 is a perspective view showing an incontinence pad according to an embodiment of the present invention. FIG. 2 is a schematic enlarged sectional view taken along the line II-II in FIG. Fig.3 (a) is a top view which shows a part of longitudinal direction of the surface sheet used for the incontinence pad shown in FIG. 1, FIG.3 (b) is the III-III sectional view taken on the line of Fig.3 (a). It is. FIG. 4 is an enlarged perspective view showing a part of the uneven area of the topsheet used for the incontinence pad shown in FIG. FIG. 5 is a perspective view of a non-woven fabric forming a surface on the skin contact surface side of the top sheet used for the incontinence pad shown in FIG. FIG. 6 is a schematic diagram showing a cross section in the thickness direction of the nonwoven fabric shown in FIG. FIG. 7 is a diagram illustrating a state in which the constituent fibers constituting the nonwoven fabric shown in FIG. 5 are fixed at the heat-sealing portion. FIG. 8 is a perspective view showing a modification in which grooves are formed in the absorber. FIG. 9 is a cross-sectional view (corresponding to FIG. 2) showing an incontinence pad according to another embodiment of the present invention. FIG. 10 is a cross-sectional view (corresponding to FIG. 2) showing an incontinence pad which is still another embodiment of the present invention. FIG. 11 is a cross-sectional view (corresponding to FIG. 2) showing an incontinence pad which is still another embodiment of the present invention. FIG. 12 is an enlarged perspective view showing the uneven region of the topsheet used for the incontinence pad shown in FIG. FIG. 13 is a cross-sectional view (corresponding to FIG. 2) showing an incontinence pad which is still another embodiment of the present invention. FIG. 14 is a schematic diagram showing a manufacturing apparatus suitably used for manufacturing the nonwoven fabric shown in FIG. 5 and the topsheet 2 shown in FIG. 15 is a cross-sectional view taken along the line DD of FIG. FIG. 16A to FIG. 16C are explanatory diagrams for explaining a state in which a plurality of small diameter portions and large diameter portions are formed in one constituent fiber between adjacent fusion portions. FIG. 17 is a cross-sectional view showing another absorber that can be used in the present invention.

The present invention will be described below based on preferred embodiments with reference to the drawings.
FIG. 1 is a perspective view of an incontinence pad 10 (hereinafter also simply referred to as “incontinence pad 10”) according to an embodiment of the present invention. 2 is an enlarged sectional view taken along line II-II in FIG.

As shown in FIGS. 1 and 2, the incontinence pad 10 includes a liquid-permeable surface sheet 2 that forms the skin contact surface P of the incontinence pad 10 and a back sheet that forms the non-skin contact surface Q of the incontinence pad 10. 3 and an absorber 4 interposed between the two sheets 2 and 3. The back sheet 3 in the incontinence pad 10 is liquid impermeable, but the back sheet 3 may be a laminated sheet in which a liquid permeable sheet is laminated on the non-skin contact surface side of the liquid permeable sheet. good. Liquid impermeability includes liquid impermeability.
The incontinence pad 10 has a vertically long shape, and has a longitudinal direction X and a width direction Y. The longitudinal direction X coincides with the wearer's front-rear direction when the incontinence pad 10 is worn, and the width direction Y is a direction orthogonal to the longitudinal direction X in the plan view of the incontinence pad 10.

  The incontinence pad 10 includes a pair of liquid-impermeable side sheets 8 on the skin contact surface side of both side portions extending along the longitudinal direction X. The liquid impermeability of the side sheet 8 also includes poor liquid permeability. In the pair of side sheets 8, one side portion along the longitudinal direction X located on the center side in the width direction of the incontinence pad 10 is joined to the side portion of the topsheet 2. The top sheet 2 and the pair of side sheets 8 are joined to the back sheet 3 outside the peripheral edge of the absorber 4, thereby forming a peripheral seal portion 7.

  On the surface (non-skin contact surface) on the back sheet 3 side of the incontinence pad 10, an adhesive portion (not shown) for fixing to underwear such as shorts is provided. The skin contact surface is a surface directed to the skin side of the wearer when worn in the absorbent article, and the non-skin contact surface is the side opposite to the skin side of the wearer during wear in the absorbent article material ( Usually, the surface is directed to the underwear side.

As shown in FIGS. 2 and 3, the topsheet 2 is formed between the plurality of protrusions 13 projecting toward the skin side and the plurality of protrusions 13 in the central region M in the width direction Y of the incontinence pad 10. It has a concavo-convex region 2M having a concave portion 14 located therein. The protrusions 13 in the present embodiment are streaky protrusions 13 extending along the longitudinal direction X of the incontinence pad 10, and a plurality of protrusions 13 are formed in the width direction Y, and the protrusions 13 in the width direction Y are mutually connected. A streak-like recess 14 as a recess 14 extending along the longitudinal direction X of the incontinence pad 10 is formed therebetween.
Further, as shown in FIGS. 1 and 2, the incontinence pad 10 is provided on both sides of the central area M in the width direction Y, and the skin contact surface side of the topsheet 2 is formed on a liquid-impermeable sidesheet 8. It has covered side areas S, S.

  The side sheet 8 in the present embodiment is a laminated sheet having a two-layer structure in which one sheet is folded back at an inner edge portion 8 a located on the center side in the width direction of the incontinence pad 10. The layers of the laminated sheet having a multilayer structure (including two layers) may not be bonded, but are preferably partially bonded by pattern-coated adhesive or partial heat fusion. . Further, the side sheet 8 may be liquid-impermeable at the stage of the single-layer structure before forming the multilayer structure, and may be liquid-impermeable when having a multilayer structure of two or more layers. It can be said.

As shown in FIGS. 2 and 3, the topsheet 2 in the present embodiment has an uneven region 2M at the center in the width direction arranged in the center region M in the width direction of the incontinence pad 10, and sandwiches the uneven region 2M. On both sides, there are non-concave regions 2S, 2S that do not have the convex portion 13 and the concave portion 14, respectively.
In each of the side regions S and S of the incontinence pad 10, the side sheet 8 having a two-layer structure covers the skin contact surface side of the non-convex region 2 </ b> S of the top sheet 2. The side sheet 8 is partly or entirely joined to the non-concave area 2S of the top sheet 2.

You may provide the junction part of this side sheet 8 and the surface sheet 2 anywhere in the range with which the side sheet 8 and the surface sheet 2 have overlapped.
For example, as shown in FIG. 2, the incontinence pad 10 of the present embodiment is a portion where the side sheet 8 covers the skin contact surface side of the topsheet 2 when the cross section along the width direction Y of the incontinence pad 10 is viewed. Is located on the absorber 4, and the remaining part of the portion covering the skin contact surface side of the topsheet 2 is located outward from the side edge 4 s of the absorber 4. In this case, the side sheet 8 may be joined to the topsheet 2 at a portion located on the absorber 4, and a portion located outside the side edge 4 s of the absorber 4 may be joined to the topsheet 2. It may be joined, or both parts may be joined to the topsheet 2. Moreover, in the liquid excretion part opposing part when dividing the incontinence pad 10 so that the total length in the longitudinal direction is equally divided into three parts, the front part, the liquid excretion part opposing part, and the rear part in order from the front The side seal 8 is formed between the side sheet 8 and the back sheet 3 with the top sheet 2 interposed therebetween, and the peripheral seal 7 is used as a joint between the side sheet 8 and the top sheet 2 while In the part and the rear part, a combination in which the side sheet 8 and the top sheet 2 are joined on the absorbent body 4 by a linear joining part extending in the longitudinal direction X is also possible. The joint between the side sheet 8 and the top sheet 2 may be formed by placing an adhesive between the side sheet 8 and the top sheet 2, or a sealing process such as heat sealing, ultrasonic sealing or high frequency sealing. You may form by.

  In the incontinence pad 10 of the present embodiment, as shown in FIG. 2, the portion located on the absorber 4 of the side sheet 8 overlaps with the non-concave area 2 </ b> S of the topsheet 2, but overlaps with the uneven area 2 </ b> M. Absent. And height tm of the skin contact surface Pm of the said center area M formed of the uneven | corrugated area | region 2M of the surface sheet 2, and the height of the skin contact surface Ps of the said side part area S formed of the side sheet 8 ts is the same.

The height tm of the skin contact surface Pm in the central area M and the height ts of the skin contact surface Ps in the side area S are both heights from the non-skin contact surface Q, and are measured by the following method. Is done.
The height under a load of 0.05 kPa is measured using a laser displacement meter (manufactured by Keyence Corporation, CCD laser displacement sensor LK-0080). Specifically, a circular plate having a mass of 2.5 g and a radius of 12.5 mm is placed on the measurement table, and the position of the upper surface of the circular plate is set as a reference point A for measurement. Next, the circular plate is removed, and the incontinence pad 10 is fixed on the measurement table in a state where the incontinence pad 10 is flattened. Then, the circular plate is placed again on the skin contact surface Pm in the central region M of the incontinence pad 10. To do. Let B be the position of the upper surface of the circular plate in this state. Then, a height (thickness) tm under a load of 0.05 kPa in the skin contact surface Pm in the central region M of the incontinence pad 10 is obtained from the difference between A and B. More specifically, a circular plate is arranged at the center in the width direction Y of the incontinence pad 10, and the height (thickness) tm is measured at several locations along the longitudinal direction X of the incontinence pad 10. A portion showing a large value is defined as a portion 2t having the highest height. Then, the height tm at the part 2t is defined as the height tm of the skin contact surface Pm in the central area M. The height (thickness) tm is preferably measured at three or more positions by shifting the position by 30 mm in the longitudinal direction X of the incontinence pad 10.
Further, 0.05 kPa on the skin contact surface Ps of the side region S in the region 2t where the height tm of the skin contact surface Pm in the central region M is the highest and the region where the position of the incontinence pad 10 in the longitudinal direction X is the same. The height (thickness) ts under the load is determined in the same manner as the measurement method of the height (thickness) tm. For example, when the height (thickness) tm shows the maximum value when the center of the circular plate is positioned on the line II-II in FIG. 1, the height of the skin contact surface Ps of the side region S is high. The thickness (thickness) ts is also measured by positioning the center of the circular plate on the line II-II in FIG.
Note that the height ts of the skin contact surface Ps in the side area S is measured at only one location for each of the left and right side areas S, and the measured value for each side area S is measured for each side area S. Is compared with the height tm of the skin contact surface Pm in the central area M. In the left and right side regions S of the absorbent article of the present invention, the height ts of the skin contact surface Ps is the same as the height tm of the skin contact surface Pm in the central region M.

  The absolute value of the difference (tm−ts) between the height tm of the skin contact surface Pm in the central region M and the height ts of the skin contact surface Ps in the side region S thus measured is 0.5 mm or less. , It is assumed that the height tm of the skin contact surface Pm in the central area M and the height ts of the skin contact surface Ps in the side area S are the same. The absolute value of the difference (tm−ts) is preferably 0.3 mm or less.

According to the incontinence pad 10 of the present embodiment, the height tm of the skin contact surface Pm in the central region M where the uneven region 2M of the topsheet 2 is exposed and the side region S formed by the sidesheet 8 Since the height ts of the skin contact surface Ps is the same, there is substantially no step between the two, and not only can the wearer feel uncomfortable, but also the side sheet 8 has skin. It is difficult to give a sense of hitting.
In addition, the side sheet 8 prevents the liquid absorbed by the absorber 4 from leaching to the side, and the skin contact surface Pm of the central region M is formed in the uneven region 2M of the top sheet 2. Since the convex portion 13 (convex portion) is a set of top regions, the movement of the liquid along the skin contact surface Pm is also suppressed as compared with the case where the skin contact surface Pm of the central region M is flat. The
Therefore, the incontinence pad 10 according to the present embodiment is also excellent in preventing side leakage.

Moreover, in the incontinence pad 10 of this embodiment, since the skin contact surface Ps of the side part area S is formed from the part distribute | arranged on the absorber 4 of the side sheet 8, the absorber 4 is absorbed by liquid absorption. Even after the thickness of the skin changes, there is hardly any step between the skin contact surface Pm in the central region M and the difference. For this reason, it is possible to effectively prevent a sense of incongruity even during wearing.
From the same viewpoint, it is preferable that at least a portion of the side sheet 8 positioned on the absorber 4 is bonded to the top sheet 2.

From the viewpoint of preventing the liquid absorbed by the absorbent body 4 from seeping out to the side, the side sheet 8 is disposed on the back surface sheet 3 at a portion F outside the side edge 4s of the absorbent body 4 along the longitudinal direction X. It is preferable to have an integrated part. The side sheet 8 in the present embodiment has a portion located on the absorber 4 and an extending portion extending outward from the side edge 4s of the absorber 4 along the longitudinal direction X. The protruding portion is integrated with the back sheet 3. More specifically, the extending portion of the side sheet 8 is integrated with the back sheet 3 in the peripheral seal portion 7 by a sealing process such as heat sealing. In addition, integration with the side sheet 8 and the back surface sheet 3 may be integration in the state in which the sheet | seat which comprises the surface sheet 2 intervened.
Moreover, it is preferable that the elastic member extended along the longitudinal direction X is not arrange | positioned in the expansion | extension state by the side seat | sheet in this invention, It is along the longitudinal direction X irrespective of whether it is being fixed in the expansion | extension state. It is preferable that the elastic member which extends is not arranged. The elastic member makes it easy for the wearer to feel a sense of incongruity or touch of the side sheet by raising the side sheet or increasing the thickness of the side sheet.

  As shown in FIG. 3, the surface sheet 2 has non-recessed areas 2S and 2S not having the protrusions 13 and the recesses 14 on both sides of the uneven area 2M having a plurality of protrusions 13 and recesses 14. is doing. As shown in FIG. 3B, the non-concave regions 2S and 2S are preferably flat on both the front surface a and the back surface b. The height is significantly lower than the height H of the protrusion 13 in the uneven area 2M [see FIG. 3B], for example, the height is the height H of the protrusion 13 in the uneven area 2M. The convex part of 1/3 or less may be formed. The height here is measured in the same manner as the method for measuring the height tm of the skin contact surface Pm in the central region M and the height ts of the skin contact surface Ps in the side region S described above. The surface sheet 2 is a measurement object. That is, there are convex portions having the same height in the entire area of the surface sheet 2, but as a result of crushing the convex portions by overlapping the side sheets 8, the height is 1/3 or less of the height H of the convex portions 13 in the uneven region 2M. When there is a convex portion, the region having the crushed convex portion does not correspond to the non-concave region.

  From the viewpoint of easily making the height tm of the skin contact surface Pm in the central region M and the height ts of the skin contact surface Ps in the side region S the height of the convex portion 13 in the uneven region 2M. The length H (see FIG. 3B) is preferably 0.5 mm or more, more preferably 1.0 mm or more, and preferably 3.0 mm or less, more preferably 2.0 mm or less, and preferably It is 0.5 mm or more and 3.0 mm or less, More preferably, it is 1.0 mm or more and 2.0 mm or less. In addition, the arrangement pitch P (see FIG. 3B) in the case where a plurality of the ridges 13 are formed in parallel as the ridges is preferably 30% or more of the height H of the ridges 13, more preferably It is 50% or more, preferably 400% or less, more preferably 200% or less, and preferably 30% or more and 400% or less, more preferably 50% or more and 200% or less.

Hereinafter, the surface sheet 2 used for the incontinence pad 10 of the present embodiment will be described more specifically. As shown in FIG. 3, in the incontinence pad 10 of the present embodiment, the skin contact surface in the central region M In the concavo-convex region 2M of the topsheet 2 that forms Pm, streak-like convex portions 13 and concave portions 14 extending in the longitudinal direction X of the incontinence pad 10 are alternately formed in the width direction Y of the incontinence pad 10. Yes.
As shown in FIGS. 2 to 4, the surface sheet 2 in the present embodiment has streaky ridges 13 and ridges 14 extending in the longitudinal direction X of the incontinence pad 10 alternately in the width direction Y of the incontinence pad 10. And the lower sheet 6 joined to the nonwoven fabric 1 at the joint portion 14s of the concave portion 14 of the nonwoven fabric 1, and the convex portion 13 has a hollow structure. have.
In the nonwoven fabric 1 having a concavo-convex structure constituting the surface sheet 2, the “one direction” in which the protrusions 13 and the recesses 14 extend is the same direction as the longitudinal direction X of the incontinence pad 10. “One direction” in which the portion 13 and the concave strip portion 14 extend is also referred to as an X direction.

  According to the incontinence pad 10 of the present embodiment, the protruding portion 13 extending in the longitudinal direction X of the incontinence pad 10 as a protruding portion is alternately arranged with the recessed portion 14 in the central region M, so that the width direction Y Since the ridge 13 can follow the movement of the wearer's skin along with the sway, irritation to the skin due to rubbing can be reduced. Moreover, since the nonwoven fabric 1 is joined with the lower sheet 6 in the concave strip portion 14, the convex strip portion 13 is based on the joint portion 14s with respect to the movement of the wearer's skin along the width direction Y. Thus, it is possible to further reduce irritation to the skin due to rubbing.

  As shown in FIGS. 2 to 5, the non-woven fabric 1 has a convex shape toward the upper side in the thickness direction (Z direction) in the cross-sectional shape of both the front and back surfaces a and b at the portion where the uneven region 2M of the topsheet 2 is formed. A plurality of ridges 13 and a ridge 14 located between adjacent ridges 13, 13. As for the concave-line part 14, the cross-sectional shape of front and back both surfaces a and b has comprised the concave shape toward the upper direction of the thickness direction (Z direction) of a nonwoven fabric. In other words, as for the concave stripe part 14, the cross-sectional shape of front and back both surfaces a and b has comprised the convex shape toward the downward direction of the thickness direction (Z direction) of a nonwoven fabric. Each of the plurality of ridges 13 extends continuously in one direction (X direction) of the nonwoven fabric 1, and each of the plurality of ridges 14 extends continuously in one direction X of the nonwoven fabric 1. I am doing. The ridges 13 and the ridges 14 are parallel to each other and are alternately arranged in a direction (Y direction) orthogonal to the one direction (X direction).

  As will be described later, the nonwoven fabric 1 is manufactured by subjecting the fiber sheet 1a to a concavo-convex process using a pair of concavo-convex rolls 401 and 402 meshing with each other. One direction (X direction) of the nonwoven fabric 1 described above is the same direction as the machine direction (MD, flow direction) when the nonwoven fabric 1 is manufactured by performing uneven processing on the fiber sheet 1a. The direction (Y direction) orthogonal to the direction (X direction) is the same direction as the orthogonal direction (CD, roll axis direction) orthogonal to the machine direction (MD, flow direction).

  The constituent fiber 11 of the nonwoven fabric 1 includes high elongation fibers. Here, the high elongation fiber included in the constituent fiber 11 means not only a fiber having a high elongation at the raw material fiber stage, but also a fiber having a high elongation at the stage of the produced nonwoven fabric 1. As the “high elongation fiber”, excluding stretchable fibers that have elasticity (elastomer) and expand and contract, for example, as described in paragraph [0033] of JP2010-168715A, melt spinning is performed at a low speed to form a composite After obtaining the fiber, the heat-extensible fiber, which is obtained by changing the crystal state of the resin by heating and / or crimping without stretching, or polypropylene or polyethylene Fibers manufactured under relatively low spinning speeds using resins such as polyethylene, polypropylene-polypropylene copolymers with low crystallinity, or fibers manufactured by dry blending polyethylene into polypropylene and spinning, etc. Is mentioned. Among these fibers, the high elongation fiber is preferably a core-sheath type composite fiber having heat-fusibility. The core-sheath type composite fiber may be a concentric core-sheath type, an eccentric core-sheath type, a side-by-side type, or a deformed type, but is preferably a concentric core-sheath type. Whatever form the fiber takes, from the viewpoint of producing a nonwoven fabric that is soft and soft to the touch, the fineness of the high elongation fiber is 1.0 dtex or more and 10.0 dtex or less at the raw material stage. Is preferable, and more preferably 2.0 dtex or more and 8.0 dtex or less.

  The constituent fibers 11 of the nonwoven fabric 1 may be configured to include other fibers in addition to the high elongation fibers, but are preferably configured only from the high elongation fibers. Other fibers include, for example, a non-heat-extensible core-sheath-type heat-fusible composite fiber containing two components having different melting points, or a fiber that does not inherently have heat-fusibility ( Examples thereof include natural fibers such as cotton and pulp, rayon and acetate fibers). When the nonwoven fabric 1 is configured to include other fibers in addition to the high elongation fibers, the proportion of the high elongation fibers in the nonwoven fabric 1 is preferably 50% by mass to 100% by mass, and more preferably It is 80 mass% or more and 100 mass% or less.

  The heat-extensible fiber, which is a high-stretch fiber, is a composite fiber that has been subjected to unstretched or weakly stretched treatment at the raw material stage. For example, the first resin component that forms the core and the sheath And a second resin component containing a polyethylene resin, and the first resin component has a higher melting point than the second 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. The melting points of the first resin component and the second resin component were determined by thermal analysis of a finely cut fiber sample (sample weight 2 mg) using a differential scanning calorimeter (DSC6200 manufactured by Seiko Instruments Inc.) at a heating rate of 10 ° C./min. 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 resin is defined as “resin having no melting point”. In this case, the temperature at which the second resin component is fused to such an extent that the strength of the fusion point of the fiber can be measured is used as the temperature at which the molecular flow of the second resin component begins, and this is used instead of the melting point.

As above-mentioned, as a 2nd resin component which comprises a sheath part, the polyethylene resin is included. Examples of the polyethylene resin include low density polyethylene (LDPE), high density polyethylene (HDPE), and linear low density polyethylene (LLDPE). In particular, a high density polyethylene having a density of 0.935 g / cm ³ or more and 0.965 g / cm ³ or less is preferable. The second resin component constituting the sheath is preferably a polyethylene resin alone, but other resins can also be blended. Other resins to be blended include polypropylene resin, ethylene-vinyl acetate copolymer (EVA), ethylene-vinyl alcohol copolymer (EVOH), and the like. However, as for the 2nd resin component which comprises a sheath part, it is preferable that 50 mass% or more in the resin component of a sheath part is 70 to 100 mass% especially polyethylene resin. The polyethylene resin preferably has a crystallite size of 10 nm or more and 20 nm or less, and more preferably 11.5 nm or more and 18 nm or less.

  As a 1st resin component which comprises a core part, the resin component whose melting | fusing point is higher than the polyethylene resin which is a constituent resin of a sheath part can be especially used without a restriction | limiting. Examples of the resin component constituting the core include polyolefin resins such as polypropylene (PP) (excluding polyethylene resin), polyester resins such as polyethylene terephthalate (PET), and polybutylene terephthalate (PBT). Furthermore, polyamide-based polymers, copolymers having two or more resin components, and the like can also be used. A plurality of types of resins can be blended and used. In this case, the melting point of the core is the melting point of the resin having the highest melting point. Since the production of the nonwoven fabric becomes easy, the difference (the former-the latter) between the melting point of the first resin component constituting the core part and the melting point of the second resin component constituting the sheath part is 20 ° C. or higher. It is preferable that it is 150 degrees C or less.

  The preferred orientation index of the first resin component in the heat-extensible fiber, which is a high elongation fiber, is naturally different depending on the resin used. For example, when the first resin component is a polypropylene resin, the orientation index may be 60% or less. Preferably, it is 40% or less, more preferably 25% or less. When the first resin component is polyester, the orientation index is preferably 25% or less, more preferably 20% or less, and still more preferably 10% or less. On the other hand, the second resin component preferably has an orientation index of 5% or more, more preferably 15% or more, and still more preferably 30% or more. The orientation index is an index of the degree of orientation of the polymer chain of the resin constituting the fiber.

  The orientation index of the first resin component and the second resin component is determined by the method described in paragraphs [0027] to [0029] of JP2010-168715A. Moreover, the method in which each resin component in the thermally stretchable conjugate fiber achieves the orientation index as described above is described in paragraphs [0033] to [0036] of JP-A No. 2010-168715.

  Further, the elongation of the high elongation fiber is preferably 100% or more and 800% or less, more preferably 200% or more and 500% or less, and further preferably 250% or more and 400% or less at the raw material stage. By using the high elongation fiber having the elongation in this range, the fiber is successfully stretched in the stretching apparatus, and the changing point from the small diameter portion to the large diameter portion described above is adjacent to the fusion portion. , The touch becomes good.

  The elongation of the high elongation fiber conforms to JISL-1015, and the measurement is based on the measurement environment temperature and humidity of 20 ± 2 ° C, 65 ± 2% RH, the tensile tester gripping distance of 20mm, and the tensile speed of 20mm / min. And In addition, when collecting fibers from an already manufactured non-woven fabric and measuring the elongation, when the gripping interval cannot be 20 mm, that is, when the length of the fiber to be measured is less than 20 mm, the gripping interval is set. Measure by setting to 10 mm or 5 mm.

  The ratio (mass ratio, the former: latter) of the first resin component and the second resin component in the high elongation fiber is 10:90 to 90:10, particularly 20:80 to 80:20, especially in the raw material stage. It is preferable that it is 50: 50-70: 30. As the fiber length of the high elongation fiber, one having an appropriate length is used according to the method for producing the nonwoven fabric. For example, when the nonwoven fabric is manufactured by the card method as described later, the fiber length is preferably about 30 to 70 mm.

  The fiber diameter of the high elongation fiber is appropriately selected depending on the specific use of the nonwoven fabric at the raw material stage. When the nonwoven fabric is used as a constituent member of an absorbent article such as a surface sheet of the absorbent article, it is preferable to use a nonwoven fabric having a size of 10 μm to 35 μm, particularly 15 μm to 30 μm. The fiber diameter is measured by the following method.

[Measurement of fiber diameter]
As the fiber diameter of the fiber, the diameter (μm) of the fiber is measured by observing the cross section of the fiber at 200 to 800 times using a scanning electron microscope (JCM-5100 manufactured by JEOL Ltd.). The cross section of the fiber is obtained by cutting the fiber using a feather razor (product number FAS-10, manufactured by Feather Safety Razor Co., Ltd.). For each extracted fiber, the fiber diameter when approximated to a circle is measured at five locations, and the average value of the five measured values is taken as the fiber diameter.

  In the raw material stage, as the heat-extensible fiber that is a high elongation fiber, in addition to the above-described heat-extensible fiber, Japanese Patent No. 4131852, Japanese Patent Application Laid-Open No. 2005-350836, Japanese Patent Application Laid-Open No. 2007-303035, The fibers described in JP 2007-204899 A, JP 2007-204901 A, and JP 2007-204902 A can also be used.

  As shown in FIG. 7, the non-woven fabric 1 focuses on one constituent fiber 11 among the constituent fibers 11 of the non-woven fabric 1, and the constituent fiber 11 is between the adjacent fusion parts 12, 12. A large-diameter portion 17 having a large fiber diameter is sandwiched between two small-diameter portions 16 and 16 having a small fiber diameter. Specifically, as shown in FIG. 7, paying attention to one constituent fiber 11 among the constituent fibers 11 of the nonwoven fabric 1, a fusion formed by heat-sealing the intersection with the other constituent fibers 11. A small diameter portion 16 having a small fiber diameter extends from the landing portion 12 with substantially the same fiber diameter. Then, paying attention to the single constituent fiber 11, the large-diameter portion 17 having a fiber diameter larger than that of the small-diameter portion 16 between the small-diameter portions 16 and 16 extending from the adjacent fusion portions 12 and 12. Are extended with substantially the same fiber diameter. Specifically, the non-woven fabric 1 focuses on one constituent fiber 11 and moves from one fused part 12 to the other fused part 12 of the adjacent fused parts 12, 12. It has constituent fibers 11 arranged in the order of a small diameter portion 16 on the side of the attachment portion 12, one large diameter portion 17, and a small diameter portion 16 on the side of the other fusion portion 12.

As described above, the low-rigidity small-diameter portion 16 is adjacent to the fused portion 12 where the rigidity of the nonwoven fabric 1 is increased, so that the flexibility of the nonwoven fabric 1 is improved and the touch is improved. Moreover, the softness | flexibility of the nonwoven fabric 1 improves further and the touch becomes still more favorable, so that the small diameter part 16 with low rigidity is provided in the component fiber 11 in multiple numbers.
The nonwoven fabric 1 has such a configuration in the portion that forms the uneven region 2M of the topsheet 2 so that the protrusion 13 (convex portion) is in the width direction Y during movement in the width direction Y of the wearer's skin. More easily bends, improves the deformability to follow the skin, and further prevents the occurrence of an uncomfortable feeling during wearing.

  As shown in FIG. 7, the nonwoven fabric 1 focuses on one constituent fiber 11 among the constituent fibers 11 of the nonwoven fabric 1, and includes a plurality of large-diameter portions 17 between adjacent fusion portions 12, 12. (2 in the nonwoven fabric 1) It has the constituent fiber 11 provided. Specifically, the non-woven fabric 1 focuses on one constituent fiber 11 and moves from one fused part 12 to the other fused part 12 of the adjacent fused parts 12, 12. Constituent fibers arranged in the order of the small-diameter portion 16 on the bonding portion 12 side, the first large-diameter portion 17, the small-diameter portion 16, the second large-diameter portion 17, and the small-diameter portion 16 on the other fused portion 12 side. 11. The nonwoven fabric 1 pays attention to one constituent fiber 11, and preferably has one large-diameter portion 17 between adjacent fused portions 12, 12 from the viewpoint of improving the touch and reducing the strength of the nonwoven fabric. 5 or less, more preferably 1 or more and 3 or less.

The ratio (L ₁₆ / L ₁₇ ) of the fiber diameter (diameter L ₁₆ ) of the small diameter portion 16 to the fiber diameter (diameter L ₁₇ ) of the large diameter portion 17 is preferably 0.5 or more and 0.8 or less, more preferably 0. .55 or more and 0.7 or less. Specifically, the fiber diameter (diameter L ₁₆ ) of the small-diameter portion 16 is preferably 5 μm or more and 28 μm or less, more preferably 6.5 μm or more and 20 μm or less, and particularly preferably 7.5 μm or more and 16 μm or less from the viewpoint of improving the touch. is there. The fiber diameter (diameter L ₁₇ ) of the large diameter portion 17 is preferably 10 μm or more and 35 μm or less, more preferably 13 μm or more and 25 μm or less, and particularly preferably 15 μm or more and 20 μm or less from the viewpoint of improving the touch.
The fiber diameters (the diameters L ₁₆ and L ₁₇ ) of the small diameter part 16 and the large diameter part 17 are measured in the same manner as the fiber diameter measurement described above.

  Further, in the nonwoven fabric 1, focusing on one of the constituent fibers 11 of the nonwoven fabric 1, the changing point 18 from the small diameter portion 16 adjacent to the fusion portion 12 to the large diameter portion 17 is It is preferable that it is arranged in the range of 1/3 of the space | interval T between the fusion parts 12 and 12 adjacent from the adhesion part 12. FIG. Here, the transition point 18 of the nonwoven fabric gradually and gradually changes from the small diameter portion 16 extending with a small fiber diameter to the large diameter portion 17 extending with a fiber diameter larger than the small diameter portion 16. It does not include a part or a part that continuously changes over a plurality of stages, and means a part where the fiber diameter changes extremely in one step. Moreover, when the said one component fiber 11 is a heat | fever extensible composite fiber, the change point 18 of the nonwoven fabric of this invention is the 1st resin component which comprises a core part, and 2nd resin which comprises a sheath part. It does not include a state in which the fiber diameter is changed by peeling between the components, and it means a part where the fiber diameter is changed by stretching.

  Further, the fact that the changing point 18 is arranged within a range of 1/3 of the interval T between the adjacent fused portions 12 and 12 from the fused portion 12 means that the constituent fibers 11 of the nonwoven fabric 1 are randomly extracted. 7, as shown in FIG. 7, using JCM-5100 (trade name) manufactured by JEOL Ltd. as a scanning electron microscope, the adjacent fused portions 12, 12 of the constituent fiber 11 are connected. Enlarge it so that it can be observed (100 to 300 times). Next, the interval T between the centers of the adjacent fused portions 12 and 12 is divided into three equal parts, and the region AT on the side of one fused portion 12, the region BT on the side of the other fused portion 12, and the center region CT Break down. This means that the change point 18 is arranged in the area AT or the area BT. Further, the non-woven fabric 1 in which the changing point 18 is disposed within a range of 1/3 of the interval T between the adjacent fused portions 12, 12 from the fused portion 12 is the number of the constituent fibers 11 of the non-woven fabric 1 20. When extracted randomly, the constituent fiber 11 in which the change point 18 is arranged in the region AT or the region BT means a nonwoven fabric in which at least one of the 20 constituent fibers 11 is present. Specifically, from the viewpoint of improving the touch, it is preferably 1 or more, more preferably 5 or more, and particularly preferably 10 or more.

  As shown in FIG. 6, the nonwoven fabric 1 includes a top region 13 a, a bottom region 13 b, and a side region 13 c located between these when the nonwoven fabric 1 is viewed in cross section along the thickness direction Z. The top region 13a, the bottom region 13b, and the side region 13c extend continuously in one direction (X direction) of the nonwoven fabric 1. The top region 13a, the bottom region 13b, and the side region 13c, when the nonwoven fabric 1 is viewed in a cross-section along the thickness direction Z, divides the thickness of the nonwoven fabric 1 in the Z direction into three equal parts, The top region 13a is distinguished from the central region as the side region 13c and the lower region as the bottom region 13b.

  As shown in FIG. 6, when the nonwoven fabric 1 is observed along the thickness direction Z, the fiber density of the side region 13c is lower than the fiber density of the top region 13a and the fiber density of the bottom region 13b. The fiber density is the number of fibers per unit area in the cross section of the nonwoven fabric 1. Therefore, the side area 13c is a sparse area in which the number of fibers is small (the distance between fibers is large) compared to the top area 13a and the bottom area 13b, and as a whole, the air permeability is improved. Liquid permeability is also improved. Furthermore, when the fiber density of the side region 13c is formed to be the smallest, the ridges 13 can easily follow the movement of the wearer's skin, and good skin contact can be realized. In order to give such a fiber density to the side region 13c, the nonwoven fabric 1 may be manufactured according to the manufacturing method described later.

The ratio (D _13c / D _13a , D _13c / D _13b ) of the fiber density (D _13c ) of the side region 13c to the fiber density (D _13a ) at the top region 13a or the fiber density (D _13b ) at the bottom region _13b ) Is preferably 0.15 or more and 0.9 or less, more preferably 0.2 or more and 0.8 or less. Specifically, the specific value of the fiber density of the nonwoven fabric 1 is such that the fiber density (D _13a ) in the top region 13a is preferably 90 / mm ² or more and 200 / mm ² or less, more preferably 100 / mm ² or more 180 lines is / mm ² or less. Also, the fiber density _{(D 13b)} at the bottom area 13b is preferably 80 present / mm ² or more 200 present / mm ² or less, more preferably 90 present / mm ² or more 180 lines / mm ² or less. The fiber density of the side region 13c _{(D 13c)} is preferably 30 lines / mm ² or more eighty / mm ² or less, more preferably 40 present / mm ² or more 70 yarns / mm ² or less. The method for measuring the fiber density is as follows.

[Measuring method of fiber density in top region 13a, bottom region 13b and side region 13c]
The nonwoven fabric is cut along the thickness direction Z using a feather razor (product number FAS-10, manufactured by Feather Safety Razor Co., Ltd.). Regarding the fiber density in the top region 13a, the top region 13a, which is the upper part when the thickness of the cut surface of the nonwoven fabric is divided into three equal parts in the Z direction, is magnified using a scanning electron microscope (fiber cross section is 30 to 30). The magnification is adjusted so that about 60 fibers can be measured (150 to 500 times), and the number of cross-sections of the fibers cut by the cut surface per fixed area (about 0.5 mm ² ) is counted. Next, it converts into the number of cross sections of the fiber per 1 mm < ² >, and makes this the fiber density in the top region 13a. The measurement is performed at three locations, and the average is the fiber density of the sample. Similarly, the fiber density in the bottom region 13b is obtained by measuring the lower part when the thickness of the cut surface of the nonwoven fabric is divided into three equal parts in the Z direction. Similarly, the fiber density of the side region 13c is obtained by measuring the central portion when the thickness of the cut surface of the nonwoven fabric is divided into three equal parts in the Z direction. Note that JCM-5100 (trade name) manufactured by JEOL Ltd. is used as the scanning electron microscope.

  In the uneven | corrugated area | region 2M of the surface sheet 2, the top part of the protruding item | line part 13 is formed from the top part area | region 13a of the nonwoven fabric 1, and the bottom part of the recessed item part 14 is formed from the bottom part area | region 13b of the nonwoven fabric 1, The side wall portion of the portion 13 is formed from the side region 13 c of the nonwoven fabric 1. The side wall portion of the ridge portion 13 is convex when the fiber density of the side region 13c of the nonwoven fabric 1 is lower than the fiber density of the top region 13a and the bottom region 13b, when moving in the width direction Y of the wearer's skin. The strip portion 13 (convex portion) is more easily bent in the width direction Y, the follow-up deformability to the skin is improved, and the occurrence of uncomfortable feeling during wearing is further prevented.

Moreover, the nonwoven fabric 1 of this embodiment is the number of the fibers which have the change point 18 in the constituent fiber which comprises the top area | region 13a, and the number of the fibers which have a change point in the constituent fiber which comprises the side part area | region 13c, and More than the number of fibers having the change point 18 in the constituent fibers constituting the bottom region 13b. The side region 13c with respect to the number of fibers having the change point 18 in the constituent fibers constituting the top region 13a (N _13a ) or the number of fibers having the change point 18 in the component fibers constituting the bottom region 13b (N _13b ) The ratio (N _13c / N _13a , N _13c / N _13b ) of the number (N _13c ) of fibers having changing points in the constituent fibers to be formed is preferably 2 or more and 20 or less, more preferably 5 or more and 20 or less. Specifically, regarding the specific value of the number of fibers having the change point 18 of the nonwoven fabric 1, the number of fibers having the change point 18 (N _13a ) in the constituent fibers constituting the top region 13a is preferably one or more. 15 or less, more preferably 5 or more and 15 or less. Further, the number (N _13b ) of fibers having the change point 18 in the constituent fibers constituting the bottom region 13b is preferably 1 or more and 15 or less, more preferably 5 or more and 15 or less. Further, the number (N _13c) of fibers having the change point 18 in the constituent fibers constituting the side region 13c is preferably 5 or more and 20 or less, and more preferably 10 or more and 20 or less. The method for measuring the number of fibers having the change point 18 is as follows.

[Measurement method of the number of fibers having the change point 18 in the constituent fibers constituting the top region 13a, the bottom region 13b, or the side region 13c]
Regarding the number of fibers having the change point 18 in the constituent fibers 11 constituting the top region 13a, the vicinity of the apex of the top region 13a, which is the upper part when the thickness T of the nonwoven fabric is divided into three equal parts in the Z direction, is scanned. Using a microscope, magnified observation (adjusted to a magnification capable of measuring about 30 to 60 fiber cross sections; 50 to 500 times), randomly extracted 20 constituent fibers 11 constituting the top region 13a, and 20 constituent fibers The number of fibers having the change point 18 in 11 is counted. This is the number of fibers having the change point 18 in the constituent fibers constituting the top region 13a. The measurement is performed at three places, and the average is the number of fibers having the change point 18 in the constituent fibers constituting the top region 13a of the sample. Similarly, regarding the number of fibers having the change point 18 in the constituent fibers 11 constituting the bottom region 13b, the vicinity of the bottom point of the bottom region 13b, which is a lower part when the thickness of the nonwoven fabric is equally divided into three in the Z direction, Determine by measuring. Similarly, the number of fibers having the change point 18 in the constituent fibers 11 constituting the side region 13c is obtained by measuring the central portion when the thickness of the nonwoven fabric is equally divided into three in the Z direction. As a scanning electron microscope, JCM-5100 (trade name) manufactured by JEOL Ltd. is used.

The thickness of the nonwoven fabric 1, the entire thickness of when the side view of the nonwoven fabric 1 and the sheet thickness T _S, the local thickness of the nonwoven fabric 1 that is curved to the irregularities and the layer thickness T _L. Sheet thickness _{T S} is preferably 0.5mm or more 7mm or less, more preferably 5mm or 1.0 mm. By setting it as this range, the bodily fluid absorption speed | velocity at the time of use is quick, the liquid return from an absorber is suppressed, and also moderate cushioning property is realizable.

Layer thickness _{T L} may be different at each site in the non-woven fabric 1 is preferably a layer thickness _{T L1} of the top region 13a is 0.1mm or more 3.0mm or less, 0.2 mm or more 2.0mm or less Is more preferable. The layer thickness T _L2 of the bottom region 13b is preferably 0.1 mm or greater and 3.0 mm or less, and more preferably 0.2 mm or greater and 2.0 mm or less. The layer thickness T _L3 of the side region 13c is preferably 0.1 mm or greater and 3.0 mm or less, and more preferably 0.2 mm or greater and 2.0 mm or less. The relationship between the layer thicknesses T _L1 , T _L2 , and T _L3 is within this range, so that the body fluid absorption speed during use is fast, the liquid return from the absorber is suppressed, and an appropriate cushioning property is realized. it can.

The sheet thickness T _S and the layer thickness T _L are measured by the following methods.
Method of measuring the thickness of the sheet T _S is in a state of applying a load of 0.05kPa nonwoven 1 is measured using a thickness gauge. A laser displacement meter manufactured by OMRON Corporation is used for the thickness measuring instrument. Thickness is measured at 10 points, and the average value is calculated as the thickness.
Layer thickness T _L of assay, by expanding the cross section of the sheet by Keyence digital microscope VHX-900 by about 20 times, to measure the thickness of each layer.

When the nonwoven fabric 1 is viewed in plan, the pitch between the tops of the ridges 13 adjacent in the Y direction is preferably 1 mm or more and 15 mm or less, and more preferably 1.5 mm or more and 10 mm or less. The height H of the ridge 13 (see FIG. 3B) is preferably 0.5 mm or greater and 3 mm or less, and more preferably 1 mm or greater and 2 mm or less. The height H is measured under a no load by observing a cross section in the thickness direction Z of the nonwoven fabric 1 with a microscope.
The basis weight of the nonwoven fabric 1 is preferably 15 g / ^{m 2} or more 50 g / ^{m 2} or less the average value of the entire sheet, 20 g / ^{m 2} or more 40 g / ^{m 2} or less is more preferable.

  Further, a small amount of fiber treatment agent such as fiber colorant, antistatic property agent, lubricant, hydrophilic agent may be attached to the surface of the constituent fiber 11 of the nonwoven fabric 1 at the raw material stage.

  As a method for attaching the fiber treatment agent to the surface of the constituent fiber 11, various known methods can be employed without any particular limitation. For example, application by spraying, application by a slot coater, application by roll transfer, immersion in a fiber treatment agent, and the like can be mentioned. These treatments may be performed on the fibers before being made into a web, or after the fibers are made into a web by various methods. However, it is necessary to perform the process before the hot air blowing process described later. The fiber having the fiber treatment agent attached to the surface is dried at a temperature sufficiently lower than the melting point of the polyethylene resin (for example, 120 ° C. or less) by, for example, a hot air blowing type dryer.

  In the uneven | corrugated area | region 2M of the surface sheet 2, as shown to Fig.3 (a), the nonwoven fabric 1 which comprises the surface sheet 2 is joined with the lower sheet 6 in each of the concave-line part 14 by heat sealing | fusion. Yes. The joining portion 14s between the nonwoven fabric 1 and the lower sheet 6 may be formed intermittently in the longitudinal direction X as shown in FIG. 3 (a), but continuously in the longitudinal direction X of the incontinence pad 10. It may be formed. The nonwoven fabric 1 may be joined to the lower sheet 6 by other joining means such as joining with an adhesive such as a hot-melt adhesive instead of joining the lower sheet 6 by thermal fusion.

  The lower sheet 6 is preferably a nonwoven fabric. As the non-woven fabric constituting the lower sheet 6, non-woven fabrics by various production methods can be used. For example, an air-through non-woven fabric in which heat-bonding points between fibers are formed on a fiber web obtained by a card method or an airlaid method by an air-through method, It is possible to use various nonwoven fabrics such as heat roll nonwoven fabric, heat embossed nonwoven fabric, spunlace nonwoven fabric, needle punched nonwoven fabric, resin bond nonwoven fabric, etc., in which heat fusion points between fibers are formed by a heat roll method on a fiber web obtained by the card method it can.

The absorbent body 4 in the absorbent article of the present invention is preferably formed with a groove 411 extending in the longitudinal direction X or a groove 412 extending in the width direction Y of the absorbent article, as shown in FIG. By forming a groove extending in the longitudinal direction X or a groove 412 extending in the width direction Y in the absorbent body 4, the liquid diffusibility is improved, and the thickness of the absorbent body 4 in the longitudinal direction X or the width direction Y after liquid absorption is increased. The change of becomes smaller. Therefore, even after liquid absorption, it is difficult for a step to occur between the skin contact surface Pm in the central region M and the skin contact surface Ps in the side region S, and it is effective that a sense of incongruity is generated even during wearing. Is prevented.
Note that it is preferable that a plurality of the grooves 411 extending in the longitudinal direction X or the grooves 412 extending in the width direction Y are provided with an interval between each other. Further, only one or both of the groove 411 extending in the longitudinal direction X or the groove 412 extending in the width direction Y may be provided.

  As the absorbent body 4, various kinds of conventionally used absorbent bodies for absorbent articles can be used without particular limitation. For example, the absorbent body 4 is composed of an absorbent core and a core wrap sheet that wraps the absorbent core. Can be used. An absorptive core can be comprised from the laminated fiber body of liquid absorbent fibers, such as a pulp, for example, and the mixed fiber body of this liquid absorbent fiber and a water absorbing polymer. Examples of the liquid-absorbing fibers constituting the absorbent core include cellulose-based hydrophilic fibers such as pulp fibers, rayon fibers, cotton fibers, and cellulose acetate. In addition to cellulose-based hydrophilic fibers, polyolefin fibers such as polyethylene and polypropylene, and condensation fibers such as polyester and polyamide may be included. Examples of water-absorbing polymers include sodium polyacrylate, (acrylic acid-vinyl alcohol) copolymer, cross-linked sodium polyacrylate, (starch-acrylic acid) graft copolymer, and (isobutylene-maleic anhydride) copolymer. Examples thereof include a polymer and a saponified product thereof, and polyaspartic acid. Each of the fibers and the water-absorbing polymer can be used alone or in combination of two or more. As the core wrap sheet, a water-permeable fiber sheet such as tissue paper or nonwoven fabric is preferably used. In addition, the core wrap sheet may wrap the entire absorbent core with one sheet, or may wrap the entire absorbent core with two or more core wrap sheets. The skin contact surface side and the non-skin contact surface side may be covered with separate sheets.

  When the absorbent body 4 is composed of an absorbent core and a core wrap sheet that wraps the absorbent core, the aforementioned groove 411 or groove 412 may be provided only in the absorbent core, or the core wrap. You may provide integrally in a sheet | seat and an absorptive core. Moreover, the groove | channel 411 extended in the longitudinal direction X of the absorbent article or the groove | channel 412 extended in the width direction Y can be used.

The thickness of the absorber 4 is preferably 1 mm or more, more preferably 2 mm or more, preferably 15 mm or less, more preferably 10 mm or less, and preferably 1 mm or more and 15 mm or less, more preferably 2 mm or more and 10 mm or less. is there.
The thickness of the absorber 4 is measured by the following method.
The thickness T is measured using a peacock precision measuring instrument (model R1-C) which is a micrometer having two parallel pressure surfaces (a fixed pressure surface and a movable pressure surface). Measurement is performed at 5 mm and a pressure of 100 kPa or less, and the size of the test specimen for measurement is set to be equal to or larger than the size of the following plate. A 20 mm × 20 mm plate (weight: 5.4 g) is placed on the test piece, the measuring element movable pressurizing surface is operated at a speed of 2 mm / s, applied to the plate, and the value immediately after stabilization is read. The pressure between the pressing surfaces (pressure applied to the test piece) is 1.3 kPa or less.

  As the forming material of the back sheet 3, various materials conventionally used for the back sheet of the absorbent article can be used without particular limitation. For example, a liquid-impermeable or water-repellent resin film, a resin film, A laminate sheet with a non-woven fabric can be used.

  It is preferable that the layers of the side sheets 8 having a multilayer structure, the top sheet 2 and the absorbent body 4, and the absorbent body 4 and the back sheet 3 are respectively joined with an adhesive. When the members are joined with an adhesive, solid coating with a slot coater or the like may be used, but pattern coating is preferred. Preferable examples of the pattern coating application include spiral patterns, dot patterns, stripe patterns (striped patterns), lattice patterns, checkered patterns, and the like.

  In the absorbent article of the present invention, the effect is more remarkable when the distance Lm (see FIG. 2) between the pair of side sheets 8 is relatively small. The case where the distance Lm between the pair of side sheets 8 is small is, for example, the case where the distance Lm between the pair of side sheets 8 is 30 mm or more and 60 mm or less.

Next, another embodiment of the present invention will be described.
Also in the incontinence pad 10A shown in FIG. 9, the topsheet 2 has an uneven region 2M having a plurality of convex portions 13 and concave portions 14 projecting toward the skin side in the central region M in the width direction Y of the incontinence pad 10A. It has the non-convex regions 2S and 2S that do not have the convex portion 13 and the concave portion 14 on both sides of the concave / convex region 2M. The configuration of the uneven area 2M is the same as that of the incontinence pad 10 described above, but the non-indented area 2S does not have the lower sheet 6 unlike the incontinence pad 10 described above.
Moreover, the side sheet 8 has a part that covers the skin contact surface side of the top sheet 2 only on the absorbent body 4, and the side sheet 8 has a part that is positioned on the absorbent body 4. It is joined with.
Also in the incontinence pad 10A, the portion of the side sheet 8 located on the absorber 4 overlaps with the non-concave area 2S of the topsheet 2 but does not overlap with the uneven area 2M. The portion of the side sheet 8 disposed on the absorber 4 is disposed so as to overlap with the non-recessed region 2S of the topsheet 2, while being disposed so as not to overlap with the uneven region 2M. And the height tm of the skin contact surface Pm of the center area M formed by the uneven | corrugated area | region 2M of the surface sheet 2, and the height ts of the skin contact surface Ps of the side part area S formed of the side sheet 8 Are the same.
The incontinence pad 10A also has the same effect as the incontinence pad 10 described above. Regarding the configuration of the incontinence pad 10A, points that are not particularly described can be the same as those of the incontinence pad 10.

An incontinence pad 10B shown in FIG. 10 includes a surface sheet 2 similar to the surface sheet 2 of the incontinence pad 10 described above, but the side region where the skin contact surface side of the surface sheet 2 is covered with the side sheet 8. S and S are formed outward in the width direction Y from the side edge 4 s of the absorber 4. The side sheet 8 is entirely located outside the side edge 4s of the absorbent body 4 in the width direction Y, and the side sheet 8 is a three-layer structure formed by folding one sheet in three. The three-layer structure portion is laminated on the non-convex region 2S of the top sheet 2 to form the skin contact surface Ps of the side region S.
Also in the incontinence pad 10B, the height tm of the skin contact surface Pm in the central region M formed by the uneven region 2M of the top sheet 2 and the skin contact surface Ps of the side region S formed by the side sheet 8 The height ts is the same.
The incontinence pad 10B also has the same effect as the incontinence pad 10 described above. Regarding the configuration of the incontinence pad 10B, points that are not particularly described can be the same as those of the incontinence pad 10.

  In the incontinence pad 10C shown in FIG. 11, the topsheet 2C has an uneven region 2M that does not have a hollow structure. FIG. 12 is a perspective view showing a part of the uneven area 2M of the topsheet 2C. The uneven area 2M of the topsheet 2C used for the incontinence pad 10C is configured to include thermoplastic fibers, and is thinner than the first part 25A and the first part 25A as shown in FIG. 2A and 24A alternately in the width direction Y of the incontinence pad 10C, and on the first surface 2a, the first part 25A forms a convex strip 25 'as a convex part, and the second part 24A serves as a concave part. The concave strip portion 24 'is formed. The concavo-convex region 2M of the topsheet 2C has a concavo-convex surface formed with convex ridges 25 'and concave ridges 24', whereas the second surface 2b is flat or compared to the concavo-convex surface. The degree of unevenness is clearly small. The topsheet 2C has non-recessed regions 2S and 2S having a constant thickness on both sides of the uneven region 2M. In the non-recessed region 2S, the first surface 2a and the second surface 2b are both flat, or the degree of unevenness is clearly smaller than that of the first surface 2a of the uneven region 2M. Also in the incontinence pad 10 </ b> C, the height tm of the skin contact surface Pm in the central area M formed by the uneven area 2 </ b> M of the top sheet 2 </ b> C and the skin contact surface Ps of the side area S formed by the side sheet 8. The height ts is the same, and the same effect as the incontinence pad 10 described above is exhibited.

  In the incontinence pad 10 </ b> D shown in FIG. 13, the absorber 4 has thin portions 42 and 42 that are thinner than the central portion 41 in the width direction at both ends in the width direction Y of the incontinence pad. And the skin contact surface side of the surface sheet 2 has the part covered with the side sheet 8 on the thin parts 42 and 42 of the absorber 4. Also in the incontinence pad 10D, the height of the skin contact surface in the central region formed by the uneven region 2M of the top sheet 2 is the same as the height of the skin contact surface in the side region formed by the side sheet 8. The same effect as the incontinence pad 10 is achieved.

The surface sheet 2 of the incontinence pad 10 described above includes a fusing step of forming a fiber sheet by thermally fusing the intersections of the constituent fibers of the fiber web containing high elongation fibers at the fusing portion, and the fiber sheet. Manufactured by a stretching process of stretching in one direction and a composite process of bonding the lower sheet 6 to the nonwoven fabric.
The manufacturing process of the surface sheet 2 will be described with reference to FIG. FIG. 14 schematically shows a preferable manufacturing apparatus 100 used in the method for manufacturing the topsheet 2. The manufacturing apparatus 100 is suitably used for manufacturing an air-through nonwoven fabric and a surface sheet using the same. The manufacturing apparatus 100 includes a web forming unit 200, a hot air processing unit 300, an extending unit 400, and a lower sheet joining unit 500 in this order from the upstream side to the downstream side of the manufacturing process.

  As shown in FIG. 14, the web forming unit 200 is provided with a web forming apparatus 201. A card machine is used as the web forming apparatus 201. As a card machine, the thing normally used in the technical field of an absorbent article can be used without a restriction | limiting in particular. Depending on the specific use of the nonwoven fabric 1, another web manufacturing apparatus, such as an airlaid apparatus, can be used instead of the card machine.

  The hot air processing unit 300 includes a hood 301 as shown in FIG. Inside the hood 301, hot air can be blown by an air-through method. The hot air processing unit 300 includes an endless conveyor belt 302 made of a breathable net. The conveyor belt 302 circulates in the hood 301. The conveyor belt 302 is made of a resin such as polyethylene terephthalate or a metal.

  The temperature of the hot air blown in the hood 301 and the heat treatment time are preferably adjusted so that the intersections of the high elongation fibers included in the constituent fibers 11 of the fiber web 1b are heat-sealed. More specifically, the temperature of the hot air is preferably adjusted to a temperature higher by 0 ° C. to 30 ° C. than the melting point of the resin having the lowest melting point among the constituent fibers 11 of the fiber web 1b. The heat treatment time is preferably adjusted to 1 to 5 seconds according to the temperature of the hot air. Moreover, it is preferable that the wind speed of a hot air is about 0.3 m / sec-1.5 m / sec from a viewpoint of encouraging the further entanglement of the constituent fibers 11. Moreover, it is preferable that a conveyance speed is about 5 m / min-100 m / min.

  The extending | stretching part 400 is provided with a pair of uneven | corrugated roll 401,402 which can mesh | engage as shown in FIG. 14, FIG. The pair of concavo-convex rolls 401 and 402 are formed so that they can be heated, and large-diameter convex portions 403 and 404 and small-diameter concave portions (not shown) are alternately arranged in the roll axial direction at the central portion in the axial length direction. It is arranged and formed. The uneven rolls 401 and 402 may or may not be heated, but the heating temperature when heating the uneven rolls 401 and 402 makes it easy to stretch the high elongation fibers included in the constituent fibers 11 of the fiber sheet 1a described later. From the viewpoint, it is preferable to be not less than the glass transition point of the resin having the highest glass transition point in the high elongation fiber and not more than the melting point of the resin having the lowest melting point in the high elongation fiber. More preferably, the temperature is 10 ° C. higher than the glass transition point of the fiber and 10 ° C. lower than the melting point, more preferably 20 ° C. higher than the glass transition point of the fiber, and 20 ° C. lower than the melting point. is there. For example, when the core / sheath fiber is used as the fiber, PET (core) having a glass transition point of 67 ° C. and a melting point of 258 ° C./PE (sheath) having a glass transition point of −20 ° C. and a melting point of 135 ° C. is used. The temperature is preferably 67 ° C. or higher and 135 ° C. or lower, more preferably 77 ° C. or higher and 125 ° C. or lower, still more preferably 87 ° C. or higher and 115 ° C. or lower.

  Further, in the manufacturing apparatus 100, as shown in FIG. 15, the interval (pitch) between the large-diameter convex portions 403, 403 adjacent to each other in the roll axis direction of the uneven roll 401 and the roll axis direction of the uneven roll 402 are adjacent to each other. The spacing (pitch) between the large-diameter convex portions 404 and 404 is the same spacing (pitch) w, and the spacing (pitch) w is such that the high elongation fibers included in the constituent fibers 11 of the fiber sheet 1a are successfully used in the stretching apparatus. From the viewpoint of stretching and extending the previously described small-diameter portion to the large-diameter portion adjacent to the fusion-bonded portion to improve the touch, it is preferably 1 mm or more and 10 mm or less, particularly preferably 1.5 mm or more. 8 mm or less. From the same viewpoint, as shown in FIG. 15, the pushing amount t of the pair of concave and convex rolls 401 and 402 (the distance between the apex of the large-diameter convex portion 403 and the apex of the large-diameter convex portion 404 adjacent to each other in the roll axis direction) is The thickness is preferably 1 mm or more and 3 mm or less, and particularly preferably 1.2 mm or more and 2.5 mm or less. From the same viewpoint, the mechanical stretch ratio is preferably 1.5 times or more and 3.0 times or less, and particularly preferably 1.7 times or more and 2.8 times or less.

  The lower sheet bonding portion 500 includes a concavo-convex roll 402 and a flat roll 501 having a smooth surface, and has a concavo-convex shape between the large-diameter convex portion 404 of the concavo-convex roll 402 and the peripheral surface of the flat roll 501. The nonwoven fabric 1 and the lower sheet 6 are joined by heating and pressing.

The manufacturing method of the surface sheet 2 using the manufacturing apparatus 100 having the above configuration will be described.
First, as shown in FIG. 14, in the web forming unit 200, a short fiber-shaped constituent fiber 11 having a heat-extensible composite fiber that is a high elongation fiber is used as a raw material, and a web forming apparatus 201 that is a card machine is used. A fiber web 1b is formed (web forming step). The fiber web 1b manufactured by the web forming apparatus 201 is in a state where its constituent fibers 11 are loosely entangled with each other, and has not yet achieved shape retention as a sheet.

  Next, as shown in FIG. 14, the fiber sheet 1 a is formed by thermally fusing the intersections of the constituent fibers 11 of the fiber web 1 b including the high elongation fibers at the fusion part 12 (fusing step). Specifically, the fiber web 1b is conveyed onto the conveyor belt 302, and hot air is blown in an air-through manner while passing through the hood 301 by the hot air processing unit 300. When hot air is thus blown by the air-through method, the constituent fibers 11 of the fiber web 1b are further entangled, and at the same time, the intersection of the entangled fibers is thermally fused (see FIG. 16 (a)), and a sheet-like shape is obtained. A fiber sheet 1a having shape retention is produced.

  Next, as shown in FIG. 15, the fused fiber sheet 1a is stretched in one direction (stretching step). Specifically, the fused fiber sheet 1a having a shape-retaining property as a sheet is conveyed between a pair of concavo-convex rolls 401 and 402, as shown in FIGS. 16 (a) to 16 (c). In addition, the fiber sheet 1a is stretched, and a large fiber diameter is sandwiched between two small-diameter portions 16 and 16 having a small fiber diameter in one constituent fiber 11 between adjacent fusion portions 12 and 12. The large diameter portion 17 is formed, and the change point 18 from the small diameter portion 16 to the large diameter portion 17 is set to be 1/3 of the interval T between the fusion portions 12 and 12 adjacent to the fusion portion 12. Form within the range. Specifically, as shown in FIG. 16A, the fiber sheet 1a in which the intersections of the constituent fibers 11 are thermally fused at the fusion part 12 is conveyed between a pair of concave and convex rolls 401 and 402. Then, the fiber sheet 1a is stretched in the orthogonal direction (CD, roll axis direction) orthogonal to the machine direction (MD, flow direction). When the fiber sheet 1a is stretched in the orthogonal direction (CD, roll axis direction), the adjacent fused portions 12, 12 fixing the constituent fibers 11 shown in FIG. Is actively stretched in the orthogonal direction (CD, roll axis direction). In particular, as shown in FIG. 16 (b), local contraction is likely to occur first in the vicinity of each fusion part 12 that fixes the constituent fibers 11, and 1 between adjacent fusion parts 12, 12. With respect to the constituent fiber 11, two small-diameter portions 16, 16 are formed at both ends, and a portion sandwiched between the two small-diameter portions 16, 16 becomes a large-diameter portion 17. A large-diameter portion 17 sandwiched between 16 is formed. In this way, local contraction is likely to occur first in the vicinity of each fusion part 12, so that the change point 18 from the small diameter part 16 to the large diameter part 17 is adjacent to the fusion part 12, adjacent to the fusion part 12. It is formed within a range of 1/3 of the interval T between the twelve.

  And about one component fiber 11 between some adjacent fused parts 12 and 12, as shown in Drawing 16 (c), in the state which left the room (extension margin) which can be extended, further It is stretched in the orthogonal direction (CD, roll axis direction), the large diameter portion 17 between the adjacent fused portions 12, 12 is stretched, and a plurality of small diameter portions 16 are formed in the large diameter portion 17. become.

  In the stretching step, the small diameter portion 16 and the large diameter portion 17 are formed from the high elongation fiber, and at the same time, the large diameter convex portion 403 of the concave / convex roll 401 and the large diameter convex portion of the concave / convex roll 401 in the fiber sheet 1a. A portion located between the portions 404 is extended more than other portions. In this case, since the constituent fiber of the fiber sheet 1a is a high elongation fiber, even if it is stretched, it is not cut and is successfully stretched. The part located between the large diameter convex part 403 of the uneven | corrugated roll 401 and the large diameter convex part 404 of the uneven | corrugated roll 401 among the fiber sheets 1a is the side area 13c of the protruding item | line part 13 in the target nonwoven fabric 1. FIG. Therefore, the fiber distance is not cut in the side region 13c by the above-described stretching, and the inter-fiber distance is increased as compared to before stretching. As a result, the fiber density of the side region 13c is lower than other parts, and air permeability is improved. And since the cut | disconnection has not arisen in the fiber which comprises the side part area | region 13c, the intensity | strength of the protruding item | line part 13 is maintained at a high level. As a result, even if a load is applied to the ridge 13, the ridge 13 is not easily crushed.

  As mentioned above, according to the manufacturing method of the surface sheet 2 using the manufacturing apparatus 100, the nonwoven fabric 1 provided with the constituent fiber 11 shown in FIG. 7 can be manufactured efficiently continuously. Moreover, the manufactured nonwoven fabric 1 is conveyed by the uneven | corrugated roll 402 to the sheet | seat junction part of the lower sheet | seat junction part 500 with the state deform | transformed into the uneven | corrugated shape. A strip-shaped nonwoven fabric 6 used as a lower sheet unwound from the roll-shaped roll 6 ′ is supplied to the sheet joining portion, and the uneven nonwoven fabric 1 is overlapped with the strip-shaped nonwoven fabric 6. And introduced between the uneven roll 402 and the flat roll 501. Between the concave-convex roll 402 and the flat roll 501, the concave strip portion and the strip-shaped nonwoven fabric 6 in the concave-convex nonwoven fabric 1 are between the large-diameter convex portion 404 of the concave-convex roll 402 and the peripheral surface of the flat roll 501. To be joined by being heated and pressurized. In this way, a belt-like topsheet 2 having a configuration in which the nonwoven fabric 1 having a concavo-convex structure at the center in the width direction is joined to the lower sheet 6 at the concave strip portion 14 is obtained. The belt-like topsheet 2 is introduced into the incontinence pad 10 production line after being wound up, or is introduced into the incontinence pad 10 production line without being wound up.

The absorbent article of this invention is not restrict | limited to this embodiment mentioned above at all, and can be changed suitably.
For example, the surface sheet in the absorbent article of the present invention is formed with a large number of scattered protrusions in a plan view, instead of one having convex protrusions extending in one direction as protrusions. It may be what is being done. In this case, the individual shapes of the independent protrusions can be any shape such as a circle, a triangle, a quadrangle, and an ellipse. In addition, the arrangement of the convex portions may be an arrangement in which a convex row composed of a plurality of convex portions is formed along the longitudinal direction or the width direction of the absorbent article, or may be a staggered arrangement or the like. good.
The absorbent article of the present invention may be a sanitary napkin or a panty liner instead of the incontinence pad. As shown in FIG. 1, the absorbent article is not limited to a plan view oval shape in which the central portion in the longitudinal direction is constricted, and may be an oval or a rectangular shape having no constricted portion, You may provide the wing part on both sides of the liquid excretion part opposing part. Moreover, the length of the lower sheet 6 made of a nonwoven fabric in one or both of the longitudinal direction X and the width direction Y of the absorbent article may be the same as or shorter than that of the nonwoven fabric 1. In the side region S of the absorbent article, the side sheet 8 may be joined to a portion of the lower sheet 6 that extends from the side edge of the nonwoven fabric 1.

  Moreover, the absorber in this invention may be comprised from the absorbent sheet 43 like the absorber 4 shown in FIG. The absorbent body 4 shown in FIG. 17 is composed of a laminate in which the absorbent sheet 43 is laminated in two or more layers. The laminate of two or more layers may be a laminate obtained by folding a single absorbent sheet and bonding the layers between them, or by laminating multiple sheets of absorbent sheets. Things can be used. Moreover, it is good also as an absorber by which an additional absorptive sheet | seat was distribute | arranged to the interlayer of one or more layers of a laminated body of two or more layers, and one part was made thick. As the absorbent sheet, an absorbent sheet containing a fiber material and a water-absorbing polymer is preferably used. In addition, as the absorbent sheet, the constituent fibers and the constituent fibers and the water-absorbing polymer are bonded to each other through an adhesive force generated in the water-absorbing polymer in a wet state or a binder such as an adhesive or an adhesive fiber added separately. A sheet or the like can be preferably used. Further, as an absorbent sheet, an absorbent sheet manufactured by the method described in JP-A-8-246395, a pulverized pulp supplied in an air stream, and a water-absorbing polymer are deposited, and then an adhesive (for example, vinyl acetate) is deposited. A dry sheet solidified with an adhesive, PVA, etc.), an absorbent sheet obtained by applying a hot-melt adhesive between paper and non-woven fabric and then spraying a superabsorbent polymer, spunbond or melt blown non-woven fabric An absorbent sheet obtained by blending a highly water-absorbing polymer during the process can also be used. These absorbent sheets can also be used as an absorber having a single layer structure without being laminated in two or more layers. In addition, the layers between the layers may not be bonded.

The following absorbent articles are disclosed regarding the embodiment described above.
<1>
An absorbent article comprising a liquid-permeable surface sheet that forms a skin contact surface, a back sheet that forms a non-skin contact surface, and an absorbent body interposed between the two sheets,
The topsheet has at least a concavo-convex region having a plurality of convex portions projecting toward the skin side and a concave portion located between the plurality of convex portions in a central region in the width direction of the absorbent article, The absorbent article has a side region where the skin contact surface side of the top sheet is covered with a liquid-impermeable side sheet on both sides of the central region, and the side sheet has the side portion It is joined to the surface sheet in a part or the whole area,
In the absorbent article, the height of the skin contact surface in the central region formed by the uneven region of the top sheet and the height of the skin contact surface of the side region formed by the side sheet are the same. There is an absorbent article.

<2>
When the absolute value of the difference (tm−ts) between the height tm of the skin contact surface in the central region and the height ts of the skin contact surface in the side region is 0.5 mm or less, the central region The absorbent article according to <1>, wherein the height tm of the skin contact surface in the case is the same as the height ts of the skin contact surface in the side region.
<3>
When the absolute value of the difference (tm−ts) between the height tm of the skin contact surface in the central region and the height ts of the skin contact surface in the side region is 0.3 mm or less, the central region The absorbent article according to <1>, wherein the height tm of the skin contact surface in the case is the same as the height ts of the skin contact surface in the side region.
<4>
The topsheet has a non-recessed area that does not have the convex part and the concave part on both sides sandwiching the uneven area, and the side sheet covers the non-recessed area and is a part of the non-recessed area. The absorbent article according to any one of <1> to <3>, wherein the absorbent article is bonded to the top sheet in a part or in the entire region.
<5>
The side sheet in the side area is any one of the items <1> to <4>, wherein a part or the whole of the portion covering the skin contact surface side of the top sheet is located on the absorber. 2. The absorbent article according to 1.
<6>
The absorbent article according to <5>, wherein the side sheet in the side region has at least a portion located on the absorber bonded to the top sheet.

<7>
Any of the above <1> to <6>, wherein in the uneven region of the top sheet, convex and concave portions extending in the longitudinal direction of the absorbent article are alternately formed in the width direction of the absorbent article. Or an absorbent article according to claim 1.
<8>
A nonwoven fabric having a concavo-convex structure in which the surface on the skin contact surface side of the concavo-convex region of the top sheet is formed with ridges and ridges extending in the longitudinal direction of the absorbent article alternately in the width direction of the absorbent article. The absorbent article according to <7>, wherein the absorbent article is formed from.
<9>
The said surface sheet is an absorbent article as described in said <8> which has a lower sheet | seat joined with the said nonwoven fabric in the said concave part of the said nonwoven fabric, and the said convex part has a hollow structure.
<10>
The absorbent article according to <9>, wherein the lower sheet is a nonwoven fabric.
<11>
The absorbent article according to <9> or <10>, wherein a joint portion between the nonwoven fabric having the uneven structure and the lower sheet is intermittently formed in a longitudinal direction of the absorbent article.
<12>
The topsheet has non-convex regions that do not have the convex portions and the concave portions on both sides of the concave-convex region,
The absorbent article according to any one of <9> to <11>, wherein the non-recessed region does not include the lower sheet.

<13>
The non-woven fabric of the concavo-convex structure is such that the fiber density of the side region forming the side wall portion of the ridge portion is the fiber density of the top region forming the top portion of the concave portion and the fiber of the bottom region forming the bottom portion of the concave portion. The absorbent article according to any one of <8> to <12>, which is lower than the density.
<14>
In the nonwoven fabric of the uneven structure, the constituent fibers constituting the nonwoven fabric are fixed at a plurality of fused portions,
Paying attention to one constituent fiber among the constituent fibers of the nonwoven fabric having the concavo-convex structure, the constituent fiber is sandwiched between two small-diameter portions having a small fiber diameter between the adjacent fused portions. The absorbent article according to any one of <8> to <13>, which has a large-diameter portion having a large fiber diameter.
<15>
Focusing on one of the constituent fibers of the nonwoven fabric of the uneven structure, the changing point from the small diameter portion adjacent to the fusion portion to the large diameter portion is the fusion fiber adjacent to the fusion portion. The absorbent article according to <14>, wherein the absorbent article is disposed within a range of 1/3 of the interval between the wearing portions.
<16>
In the non-woven fabric having the concavo-convex structure, the number of fibers having a change point from the small diameter portion to the large diameter portion in the constituent fibers constituting the side region forming the side wall portion of the ridge portion is the top of the ridge portion. The number of fibers having a change point from the small diameter portion to the large diameter portion in the constituent fiber constituting the top region forming the bottom region, and the small diameter in the constituent fiber constituting the bottom region forming the bottom of the concave portion The absorbent article according to <14> or <15>, wherein the absorbent article is formed more than the number of fibers having a change point from the portion to the large diameter portion.
<17>
The ratio (L ₁₆ / L ₁₇ ) of the fiber diameter (diameter L ₁₆ ) of the small diameter portion to the fiber diameter (diameter L ₁₇ ) of the large diameter portion is 0.5 or more and 0.8 or less, preferably 0.55 or more. The absorbent article according to any one of <14> to <16>, which is 0.7 or less.
<18>
The arrangement pitch of the ridges is 30% or more of the height of the ridges, preferably 50% or more, 400% or less, preferably 200% or less, 30% or more and 400% or less, The absorbent article according to any one of <7> to <17>, preferably 50% or more and 200% or less.

<19>
The absorbent article according to any one of <1> to <18>, wherein a groove extending in the longitudinal direction of the absorbent article or a groove extending in the width direction of the absorbent article is formed in the absorbent body.
<20>
Any one of the above <1> to <19>, wherein the side sheet is a laminated sheet in which one sheet is folded back at an inner edge located on the center side in the width direction of the absorbent article to form a two-layer structure. Absorbent article as described in 1.
<21>
The absorbent article according to <20>, wherein the layers of the laminated sheet are partially joined.
<22>
Any of the above <1> to <21>, wherein the topsheet and the sidesheet are joined to the backsheet outside the peripheral edge of the absorber, thereby forming a peripheral seal part Or an absorbent article according to claim 1.
<23>
The absorbent article according to any one of <1> to <22>, wherein the side sheet is not provided with an elastic member extending along a longitudinal direction of the absorbent article.

<24>
The height of the convex portion in the uneven region is 0.5 mm or more, preferably 1.0 mm or more, and 3.0 mm or less, preferably 2.0 mm or less, and 0.5 mm or more and 3.0 mm or less. The absorbent article according to any one of <1> to <23>, preferably 1.0 mm to 2.0 mm.
<25>
<1> to <24, wherein the absorber has a thickness of 1 mm or more, preferably 2 mm or more, 15 mm or less, preferably 10 mm or less, and 1 mm or more and 15 mm or less, preferably 2 mm or more and 10 mm or less. > Any one of>.
<26>
The absorbent article according to any one of <1> to <25>, wherein the distance between the side sheets is 30 mm or more and 60 mm or less.
<27>
The absorbent article according to any one of <1> to <26>, wherein the entire side sheet is positioned outward in the width direction of the absorbent article from a side edge of the absorbent body.
<28>
The absorbent body has thin portions that are thinner than the central portion in the width direction at both ends in the width direction,
The absorbent article according to any one of <1> to <27>, wherein a skin contact surface side of the topsheet is covered with the sidesheet on a thin portion of the absorbent body. .

10, 10A-10D Incontinence pad (absorbent article)
DESCRIPTION OF SYMBOLS 1a Fiber sheet 1b Fiber web 2,2C Surface sheet 1 Nonwoven fabric 11 Constituent fiber 12 Fusion part 16 Small diameter part 17 Large diameter part 6 Lower sheet 13 Convex part (convex part)
DESCRIPTION OF SYMBOLS 14 Concave part 14s Joint part 2M Uneven area 2S Non uneven area 3 Back surface sheet 4 Absorber 411 Groove 412 Groove 7 Peripheral seal part 8 Side sheet 100 Manufacturing apparatus 200 Web formation part 201 Web formation apparatus 300 Hot-air process part 400 Extension part 401 , 402 Uneven roll 403, 404 Large-diameter convex part 500 Lower sheet joint part 501 Flat roll

Claims (11)

An absorbent article comprising a liquid-permeable surface sheet that forms a skin contact surface, a back sheet that forms a non-skin contact surface, and an absorbent body interposed between the two sheets,
The topsheet has at least a concavo-convex region having a plurality of convex portions projecting toward the skin side and a concave portion located between the plurality of convex portions in a central region in the width direction of the absorbent article, The absorbent article has a side region where the skin contact surface side of the top sheet is covered with a liquid-impermeable side sheet on both sides of the central region, and the side sheet has the side portion It is joined to the surface sheet in a part or the whole area,
In the absorbent article, the height of the skin contact surface in the central region formed by the uneven region of the top sheet and the height of the skin contact surface of the side region formed by the side sheet are the same. Oh it is,
The side sheet in the side region has a portion located on the absorber, and the upper surface of the portion located on the absorber is flat across the entire width direction of the absorbent article, An absorbent article forming a skin contact surface in a side region. The portion of the side sheet located on the absorber has a multilayer structure portion of two or three layers, and the upper surface of the multilayer structure portion is flat across the width direction of the absorbent article, and the side The absorbent article of Claim 1 which forms the skin contact surface of a partial area . An absorbent article comprising a liquid-permeable surface sheet that forms a skin contact surface, a back sheet that forms a non-skin contact surface, and an absorbent body interposed between the two sheets,
The topsheet has at least a concavo-convex region having a plurality of convex portions projecting toward the skin side and a concave portion located between the plurality of convex portions in a central region in the width direction of the absorbent article, The absorbent article has a side region where the skin contact surface side of the top sheet is covered with a liquid-impermeable side sheet on both sides of the central region, and the side sheet has the side portion It is joined to the surface sheet in a part or the whole area,
In the absorbent article, the height of the skin contact surface in the central region formed by the uneven region of the top sheet and the height of the skin contact surface of the side region formed by the side sheet are the same. Yes,
The side region is formed outward in the width direction of the absorbent article from the side edge of the absorbent body,
The entire side sheet is located on the outer side in the width direction of the absorbent article than the side edge of the absorber,
The side sheet has a three-layer structure portion formed by folding one sheet into three, and the upper surface of the three-layer structure portion is flat across the entire width direction of the absorbent article, An absorbent article that forms a skin contact surface of a region. An absorbent article comprising a liquid-permeable surface sheet that forms a skin contact surface, a back sheet that forms a non-skin contact surface, and an absorbent body interposed between the two sheets,
The topsheet has at least a concavo-convex region having a plurality of convex portions projecting toward the skin side and a concave portion located between the plurality of convex portions in a central region in the width direction of the absorbent article, The absorbent article has a side region where the skin contact surface side of the top sheet is covered with a liquid-impermeable side sheet on both sides of the central region, and the side sheet has the side portion It is joined to the surface sheet in a part or the whole area,
In the absorbent article, the height of the skin contact surface in the central region formed by the uneven region of the top sheet and the height of the skin contact surface of the side region formed by the side sheet are the same. Yes,
The absorbent body has thin portions that are thinner than the central portion in the width direction at both ends in the width direction of the absorbent article, and the skin of the topsheet on the thin portion in the side sheet. An absorbent article in which an upper surface of a portion covering the contact surface side is flat across the entire width direction of the absorbent article and forms a skin contact surface of the side region. The topsheet has a non-recessed area that does not have the convex part and the concave part on both sides sandwiching the uneven area, and the side sheet covers the non-recessed area and is a part of the non-recessed area. The absorptive article according to any one of claims 1 to 4 currently joined to said surface sheet in a part or all areas. The absorbent article according to any one of claims 1, 2, 4, and 5 , wherein at least a portion of the side sheet in the side region located on the absorbent body is bonded to the top sheet. . The irregular region of the surface sheet, convex portions and concave portions extending in the longitudinal direction of the absorbent article are formed alternately in the width direction of the absorbent article, any one of claims 1 to 6 Absorbent article as described in 1. A nonwoven fabric having a concavo-convex structure in which the surface on the skin contact surface side of the concavo-convex region of the top sheet is formed with ridges and ridges extending in the longitudinal direction of the absorbent article alternately in the width direction of the absorbent article. The absorptive article according to claim 7 formed from. The absorptive article according to claim 8 with which said surface sheet has a lower sheet joined with said nonwoven fabric in said concave part of said nonwoven fabric, and said convex part has a hollow structure. The non-woven fabric of the concavo-convex structure is such that the fiber density of the side region forming the side wall portion of the ridge portion is the fiber density of the top region forming the top portion of the concave portion and the fiber of the bottom region forming the bottom portion of the concave portion. The absorptive article according to claim 8 or 9 which is lower than a density. The absorbent article according to any one of claims 1 to 10 , wherein a groove extending in the longitudinal direction of the absorbent article or a groove extending in the width direction of the absorbent article is formed in the absorbent body.

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