CN107106364B - Absorbent article - Google Patents

Abstract

An absorbent article (1) comprising a front sheet (12) and a back sheet (13) each comprising a composite sheet, and an absorbent body (14) disposed between the sheets, wherein the composite sheet (10) has a first direction (X) along the longitudinal direction of the article and a second direction (Y) along the width direction of the article, and wherein the first sheet (1) and the second sheet (2) which are laminated are partially joined to form a plurality of joined portions, the first sheet (1) projects in a direction away from the second sheet (2) at a portion other than the joined portions and forms a projection projecting toward the skin of a wearer, the composite sheet (10) has a central region (M) and a pair of side regions (S, S) in which the projections are formed in different patterns from each other, the area ratio of the joined portions in the side regions (S) is higher than the area ratio of the joined portions in the central region (M), and the height of the projection having the greatest height in the central region (M) is the same as the height of the projection having the greatest height in the side regions (S) The same is true.

Description

Absorbent article

Technical Field

The present invention relates to an absorbent article such as a disposable diaper, a sanitary napkin, and an incontinence pad.

Background

Conventionally, as a topsheet of an absorbent article such as a disposable diaper, a sanitary napkin, an incontinence pad, or the like, a sheet having an uneven shape formed on a surface facing the skin of a wearer by embossing or the like is known. Further, a technique is known in which a surface of the topsheet on the skin side is formed into an uneven shape to improve the leakage prevention effect of soft feces, urine, and the like (patent documents 1 and 2).

However, when the absorbent body is thinned in order to improve the fit when worn, or when the rigidity of the absorbent body is reduced by making a part of the absorbent body open, gathers are likely to occur in the topsheet positioned in the crotch portion, the leakage prevention effect due to the uneven shape of the topsheet is reduced, and loose stools or urine is likely to flow along the gathers and leak out.

Further, in order to suppress leakage of loose stool or urine from the crotch portion, a technique is known in which irregularities having a larger height difference than those provided in the central region are formed in the side regions of the topsheet disposed on both sides of the absorbent body, thereby suppressing lateral flow of loose stool or urine toward the sides of the absorbent article (see patent document 3).

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2004-174234

Patent document 2: japanese laid-open patent publication No. 2009-136349

Patent document 3: japanese laid-open patent publication No. 2009-148445

Disclosure of Invention

The present invention relates to an absorbent article including a front sheet and a back sheet each formed of a composite sheet, and an absorbent body disposed between the front sheet and the back sheet. The composite sheet has a first direction along the longitudinal direction of the article and a second direction along the width direction of the article, and the laminated first sheet and second sheet are partially joined to form a plurality of joined portions, and the first sheet protrudes in a direction away from the second sheet at a portion other than the joined portions to form a protruding portion protruding toward the skin of the wearer. The composite sheet has a central region in which the projections are formed in different patterns from each other, and a pair of side regions located on both sides of the central region. The area ratio of the joining portion in each side region is higher than the area ratio of the joining portion in the central region. The height of the convex portion having the largest height in the central region is the same as the height of the convex portion having the largest height in each of the side regions.

Effects of the invention

According to the absorbent article of the present invention, the boundary between the central region and the side region of the topsheet is easily bent, and the absorbent article is easily deformed into a boat-like shape when worn, and excellent leakage prevention performance can be obtained. Further, since the height of the convex portion having the largest height is made the same in the central region and the side regions and the formation pattern of the convex portion formed in the central region and the side regions is made different, excellent leakage preventing performance is realized, and therefore, even when the absorbent article is stored in a state of being packed in a compressed state in the package bag, the leakage preventing performance is less likely to be lowered. The boat-shaped shape is a state in which the cross section of the absorbent article along the longitudinal direction thereof is curved in a concave shape with the skin contact surface side being the inside, and the side regions of the front sheet are bent in the vicinity of the boundary with the central region, and are raised so as to be close to the skin of the wearer.

Drawings

Fig. 1 is a plan view showing a basic configuration of a disposable diaper which is an embodiment of an absorbent article of the present invention.

Fig. 2 is a sectional view taken along line II-II of fig. 1.

Fig. 3 is a plan view showing a front sheet of the disposable diaper according to the first embodiment and a partially enlarged plan view thereof.

Fig. 4 is an enlarged perspective view of a part of the central region of the composite sheet used in the first embodiment.

Fig. 5 is an enlarged perspective view of a part of a side region of the composite sheet used in the first embodiment.

Fig. 6 is an enlarged plan view of a part of the central region of the composite sheet used in the first embodiment.

Fig. 7 is an enlarged plan view of a part of the central region of the composite sheet used in the first embodiment.

Fig. 8 is an enlarged plan view showing a part of the central region shown in fig. 6 and 7 in a further enlarged manner.

Fig. 9(a) is a sectional view taken along line VIa-VIa of fig. 8, and fig. 9(b) is a sectional view taken along line VIb-VIb of fig. 8.

Fig. 10 is an enlarged plan view of a part of the side region of the composite sheet used in the first embodiment.

Fig. 11 is a sectional view taken along line III-III of fig. 10.

Fig. 12 is a sectional view taken along line IV-IV of fig. 10.

Fig. 13(a) and 13(b) are enlarged plan views of a part of the side region of the composite sheet shown in fig. 3.

Fig. 14(a) and 14(b) are enlarged plan views of a part of the side region of the composite sheet shown in fig. 3.

Fig. 15 is a schematic view showing an apparatus suitable for manufacturing the composite sheet shown in fig. 3.

Fig. 16 is a perspective view of the apparatus shown in fig. 15 in a state in which the central region of the first roller is partially exploded.

Fig. 17 is a perspective view of the apparatus shown in fig. 15 in a state in which the side region of the first roller is partially exploded.

Fig. 18 is a plan view of the peripheral surface of the central region forming portion of the first roller in the apparatus shown in fig. 15.

Fig. 19 is a plan view of the circumferential surface of the side region forming portion of the second roller in the apparatus shown in fig. 15.

Fig. 20 is a plan view of the second roller shown in fig. 19, in which the convex portion is in mesh with the circumferential surface of the central region forming portion of the first roller shown in fig. 18.

Fig. 21 is a plan view of the circumferential surface of the side region forming portion of the first roller in the apparatus shown in fig. 15.

Fig. 22 is a plan view of the circumferential surface of the side region forming portion of the second roller in the apparatus shown in fig. 15.

Fig. 23 is a plan view of the second roller shown in fig. 22, in which the convex portion is engaged with the circumferential surface of the side region forming portion of the first roller shown in fig. 21.

Fig. 24 is a plan view showing a front sheet of the disposable diaper according to the second embodiment.

Fig. 25 is an enlarged perspective view of a part of a side region of the composite sheet used in the second embodiment.

Fig. 26 is an enlarged plan view of a part of a side region of the composite sheet used in the second embodiment.

Fig. 27 is a plan view showing a part of the side area shown in fig. 26 in a further enlarged manner.

FIG. 28(a) is a sectional view taken along line VIa-VIa of FIG. 27, and FIG. 28(b) is a sectional view taken along line VIb-VIb of FIG. 27.

Fig. 29 is a view corresponding to fig. 23 of side region forming portions of a first roll and a second roll for manufacturing a composite sheet used in the second embodiment.

Fig. 30 is a plan view showing a front sheet of the disposable diaper according to the third embodiment.

Fig. 31 is an enlarged plan view of a part of the central region of the composite sheet used in the third embodiment.

Fig. 32 is an enlarged plan view of a part of a side region of the composite sheet used in the third embodiment.

Fig. 33 is a plan view showing a front sheet of the disposable diaper according to the fourth embodiment.

Fig. 34 is an enlarged plan view of the vicinity of the boundary between the central region and the side regions of the composite sheet used in the fourth embodiment.

FIG. 35(a) is a sectional view taken along line Va-Va in FIG. 34, FIG. 35(b) is a sectional view taken along line Vb-Vb in FIG. 34, and FIG. 35(c) is a sectional view taken along line Vc-Vc in FIG. 34.

FIG. 36(a) is a sectional view taken along line Vd-Vd in FIG. 34, and FIG. 36(b) is a sectional view taken along line Ve-Ve in FIG. 34.

Fig. 37 is a view corresponding to fig. 20 and 23 for manufacturing a first roll and a second roll of a composite sheet used in the fourth embodiment.

Fig. 38 is a plan view showing the back-side portion side of a disposable diaper having a preferred configuration in addition to the basic configuration shown in fig. 1.

Fig. 39 is a schematic plan view showing a preferred arrangement of the continuous protrusions and the elastic members in the elastic member arrangement region formed in the back side portion of the disposable diaper shown in fig. 38.

Detailed Description

When the irregularities having a height difference higher than the irregularities arranged therebetween are formed in the side regions of the topsheet arranged on both sides of the absorbent body as in the technique described in patent document 3, when the absorbent article is stored in a state of being compressed and filled in the packaging bag by sealing, pressure is concentrated on the high-height protrusions present in the side regions, and the height of the protrusions is difficult to maintain, and when the degree of compression is increased or the storage period is prolonged, there is a possibility that the leakage preventing effect by the irregularities is reduced.

In addition, in the case where the front sheet has side regions having continuous or aligned convex portions in the longitudinal direction of the absorbent article, when the absorbent article is contracted in the longitudinal direction by three-dimensional gathers, leg gathers, or the like, gathers appear in the side regions, and there is a possibility that the leakage preventing effect by the unevenness cannot be sufficiently obtained.

The technical problem underlying the present invention is to provide an absorbent article which overcomes the drawbacks of the prior art mentioned above.

The present invention will be described below with reference to the drawings based on preferred embodiments of the present invention.

Fig. 1 and 2 show a basic structure of a disposable diaper 100 (hereinafter also simply referred to as a diaper 100) as one embodiment of an absorbent article of the present invention.

As shown in fig. 1 and 2, the diaper 100 includes a liquid-permeable front sheet 12, a liquid-impermeable back sheet 13, and an absorbent body 14 disposed between the two sheets 12, 13. The liquid-impermeable back sheet 13 is a concept including a liquid-impermeable back sheet, and includes a case where the back sheet 13 does not pass liquid at all, and a case where the back sheet is made of a water-repellent sheet or the like.

The diaper 100 has an article longitudinal direction Xa which is a direction coinciding with the front-back direction of the wearer when worn, and an article width direction Ya which is orthogonal to the article longitudinal direction Xa in a state where the diaper 100 is laid out flat as shown in fig. 1. The diaper 100 has, in the article longitudinal direction Xa, an abdominal portion a disposed on the abdominal side of the wearer when worn, a back portion B disposed on the back side of the wearer when worn, and a crotch portion C located between the abdominal portion a and the back portion B. The diaper 100 is an open-type disposable diaper, and is provided with fastener tapes 17 at both side edges of a back portion B, and a fastening region 18 for fastening the fastener tapes 17 is provided on an outer surface of a stomach portion a.

The absorbent body 14 in the diaper 100 includes an absorbent core 14a and a core-spun sheet 14b which wraps the absorbent core 14 a. The absorbent core 14a may be formed of a fiber laminate of liquid-absorbent fibers such as pulp fibers, or a mixed fiber laminate of liquid-absorbent fibers and a water-absorbent polymer. Examples of the liquid-absorbent fibers include cellulose-based hydrophilic fibers such as pulp fibers, rayon fibers, cotton fibers, and cellulose acetate fibers. In addition to cellulose-based hydrophilic fibers, fibers made of synthetic resins such as polyolefin, polyester, and polyamide may be hydrophilized with a surfactant or the like. As the core sheet 14b, for example, a paper (tissue paper) or a water-permeable nonwoven fabric can be used. The core sheet 14b may be formed by covering the entire absorbent core 14a with 1 sheet, or may be formed by covering the absorbent core 14a with 2 or more sheets in combination. As the back sheet 13, a liquid-impermeable or water-repellent resin film, a laminate of a resin film and a nonwoven fabric, or the like can be used.

The diaper 100 has three-dimensional gather forming sheets 15 having elastic members 15a disposed on both sides in the article longitudinal direction Xa, and by contraction of the elastic members 15a, three-dimensional gathers standing up toward the skin side of the wearer are formed in the crotch portion C in the worn state. In addition, leg elastic members 16 are disposed in an extended state in portions of the crotch portion C disposed around the thighs, and contraction thereof forms leg gathers in the crotch portion C that improve the fit around the thighs of the wearer in the worn state.

The topsheet 12 of the disposable diaper 100 according to the first embodiment is composed of the composite sheet 10 shown in fig. 3.

As shown in fig. 3, the composite sheet 10 has a first direction X along the longitudinal direction (article longitudinal direction) Xa of the diaper 100 and a second direction Y along the width direction (article width direction) Ya of the diaper 100. As shown in fig. 3, the composite sheet 10 has a central region M in which the projections 40 to 42 are formed in different patterns from each other, and a pair of side regions S, S located on both sides of the central region M. The central region M is located at the central portion in the width direction (article width direction) Ya of the diaper 100, and the pair of side regions S, S are formed outward of both side edges of the central region M in the second direction Y. The central region M having projections formed in different patterns from each other and the side regions S, S on both sides thereof are preferably formed at least in the crotch portion C in the longitudinal direction Xa of the diaper 100, more preferably formed from the crotch portion C to either or both of the front and back side portions a, B, or formed over the entire length of the absorbent body 14, and even more preferably over the entire length of the diaper 100.

Fig. 4 is a perspective view showing a part of the central region M of the composite sheet 10 in an enlarged manner, and fig. 5 is a perspective view showing a part of the side regions S of the composite sheet 10 in an enlarged manner. The side regions S are formed at positions that are bilaterally symmetric with respect to a center line (not shown) of the diaper 100 along the longitudinal direction Xa, and the side regions S are formed with irregularities in a pattern shown in fig. 5.

As shown in fig. 4 and 5, in both the central region M and the side regions S of the composite sheet 10, the first sheet 1 and the second sheet 2 stacked are partially joined by embossing to form a plurality of joined portions, and the first sheet 1 projects in a direction away from the second sheet 2 at a portion other than the joined portions to form a projection projecting toward the skin of the wearer. In both the central region M and the side region S of the composite sheet 10, the surface on the second sheet 2 side is substantially flat, and the first sheet 1 side has a large undulation.

The first sheet 1 and the second sheet 2 are made of sheet material. As the sheet material, for example, a nonwoven fabric, a fiber sheet such as a woven fabric or a knitted fabric, a film or the like can be used, and from the viewpoint of the touch of the skin or the like, a fiber sheet is preferably used, and a nonwoven fabric is particularly preferably used. The types of sheet materials constituting the first sheet 1 and the second sheet 2 may be the same or different.

Examples of the nonwoven fabric when the nonwoven fabric is used as the sheet material constituting the first sheet 1 and the second sheet 2 include a through-air nonwoven fabric, a spunbond nonwoven fabric, a spunlace nonwoven fabric, a meltblown nonwoven fabric, a resin-bonded nonwoven fabric, and a needle-punched nonwoven fabric. A laminate comprising a combination of 2 or more of these nonwoven fabrics, or a laminate comprising a combination of these nonwoven fabrics and a film or the like may also be used. Among these, a through-air nonwoven fabric or a spunbond nonwoven fabric is preferably used. The grammage of the nonwoven fabric used as the sheet material constituting the first sheet 1 and the second sheet 2 is preferably 10g/m²Above, more preferably 15g/m²Above, it is preferably 40g/m²Hereinafter, more preferably 35g/m²The following. The grammage of the nonwoven fabric is preferably 10g/m²Above 40g/m²Hereinafter, more preferably 15g/m²Above 35g/m²The following.

As the fibers constituting the nonwoven fabric, fibers made of various thermoplastic resins can be used. Examples of the thermoplastic resin include polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate, polyamides such as nylon 6 and nylon 66, polyacrylic acid, polyalkyl methacrylate, polyvinyl chloride, and polyvinylidene chloride. These resins may be used alone in 1 kind, or in a blend of 2 or more kinds. The fiber may be used in the form of a core-sheath type, a side-by-side type, or other composite fiber.

[ constitution of the central region M of the composite sheet 10 ]

Fig. 6 and 7 are enlarged plan views of the central region M of the composite sheet 10 shown in fig. 3. Fig. 8 is an enlarged plan view showing a part of the central region shown in fig. 6 and 7 in an enlarged manner. Fig. 9(a) and 9(b) are sectional views of VIa-VIa of fig. 8, and of VIb-VIb of fig. 8.

As shown in fig. 3, 4 and 6, the convex portions 40 are formed in the central region M of the composite sheet 10 in a state of being dispersed in the in-plane direction of the composite sheet 10. The projections 40 are arranged in a staggered manner. More specifically, as shown in fig. 6, the convex portion 40 includes: the plurality of projections 40 are arranged in a first direction projection row 4X in which the projections are arranged at regular intervals in the first direction X, a second direction projection row 4Y in which the projections 40 are arranged at regular intervals in the second direction Y, and a third direction projection row 4XY in which the projections 40 are arranged at regular intervals in a third direction inclined with respect to both the first direction X and the second direction Y. In addition, the arrangement positions of the convex portions 40 in the second direction convex portion rows 4Y adjacent to each other in the first direction X are shifted by half a pitch in the second direction Y, and the arrangement positions of the convex portions 40 in the first direction convex portion rows 4X adjacent to each other in the second direction Y are shifted by half a pitch in the first direction X.

As shown in fig. 8, 9(a) and 9(b), each of the convex portions 40 formed in the central region M of the composite sheet 10 is composed of a high convex portion 41 'having a hollow portion 41V on the back surface side and 4 low convex portions 42', each of which has a top portion 40t forming the convex portion 40 and is formed in a state of being connected to the high convex portion 41 'around the high convex portion 41'. In the present specification, the coupled state of the high convex portion 41 ' and the low convex portion 42 ' formed around the high convex portion 41 ' means that the adjacent high convex portion 41 ' and low convex portion 42 ' are not separated by the joint portion 3, but are continuously raised with respect to the surface of the joint portion 3 on the first sheet 1 side.

Each of the projections 40 has a substantially cross shape in a plan view of the composite sheet 10, with the low projections 42 'extending in four directions from the high projection 41' at the central portion. In other words, each convex portion 40 has a recessed portion 45 recessed toward the high convex portion 41 'side between the low convex portions 42' adjacent to each other in the circumferential direction of the convex portion in a plan view of the composite sheet 10.

The composite sheet 10 has a first joint 31, a second joint 32, and a third joint 33 formed as a joint 3 formed by joining the first sheet 1 and the second sheet 2 stacked partially. In these joined portions 31 to 33, the first sheet 1 and the second sheet 2 are integrally pressed, and the density of both sheets is higher than that of any other portion, and it is preferable that the two sheets are thermally fused by melting and then solidifying the constituent resin of one or both sheets.

As shown in fig. 7, the joint 3 in the central region M of the composite sheet 10 is formed in a lattice-like arrangement pattern including a plurality of lattice-forming first joint rows LR1 formed by linearly arranging a plurality of joints 3 at intervals, and a plurality of lattice-forming second joint rows LR2 formed by linearly arranging a plurality of joints 3 at intervals, and the projections 40 in the above-described form are formed at portions of the lattice corresponding to the mesh. In the central region M of the composite sheet 10, the lattice-forming first joint row LR1 and the lattice-forming second joint row LR2 intersect each other at every other joint in each row, and the mesh of the lattice in which the projections 40 are formed is surrounded by 8 joints 3.

As shown in fig. 7, the joint 3 in the central region M of the composite sheet 10 is arranged in an inclined lattice shape inclined with respect to the first direction X and the second direction Y. That is, both the lattice-forming first land row LR1 and the lattice-forming second land row LR2 are inclined with respect to each of the first direction X and the second direction Y. The angle θ (see fig. 7) formed by the lattice-forming first joint row LR1 and the lattice-forming second joint row LR2 is preferably 30 ° to 165 °, more preferably 45 ° to 150 °, further preferably more than 90 ° and 120 ° or less.

As shown in fig. 6 and 8, the first joint 31, the second joint 32, and the third joint 33 in the central region M of the composite sheet 10 are arranged at different positions in the second direction Y. The first to third joint portions 31 to 33 are equally large. Here, the term "same shape" means the same shape and the difference in size is within ± 20% in area. The first to third joint portions 31 to 33 are each rectangular in shape in plan view, and each side of the rectangle coincides with the first direction X or the second direction Y.

The plurality of first engaging portions 31 are arranged in a row at a pitch along the second direction Y, forming a first engaging portion row R1. The second engaging portions 32 are also arranged in a row at a pitch along the second direction Y to form a second engaging portion row R2. The third engaging portions 33 are also arranged in a row at a pitch along the second direction Y to form a third engaging portion row R3.

The first and third joint rows R1 and R3 are formed in a plurality of rows at regular intervals in the first direction X, and the pitch (distance between center points) between the joints in the second direction Y of the first joint row R1 is the same as the pitch (distance between center points) between the joints in the second direction Y of the third joint row R3. The arrangement position in the second direction Y is arranged such that the third joint portion 33 is located at the center between the first joint portions 31 adjacent to each other in the second direction Y, and the first joint portion 31 is located at the center between the third joint portions 33 adjacent to each other in the second direction Y. The second joint row R2 is formed at the center between the first joint row R1 and the third joint row R3 with a space between the first joint row R1 and between the third joint row R3, respectively. The pitch (distance between center points) between the engaging portions of the second engaging portion row R2 is half the pitch (distance between center points) between the engaging portions in the first and third engaging portion rows R1, R3, and the arrangement position of the second engaging portion 32 is the central portion of the arrangement position of the first engaging portion 31 and the arrangement position of the third engaging portion 33 when viewed along the second direction Y.

The first to third joining portions 31 to 33 are formed as described above, and when the composite sheet 10 is manufactured, a plurality of convex portions 40 having a special form can be formed in the central region M of the composite sheet 10 by pressing portions corresponding to the portions surrounded by the first to third joining portions 31 to 33 from the back side or sucking the portions from the front side.

Further describing the convex portion 40, as shown in fig. 8, it is surrounded by a total of 8 joint portions including 2 adjacent first joint portions 31 in the first joint portion row R1, a total of 4 second joint portions 32 of the 2 second joint portion rows R2 located on both sides of the first joint portion row R1, and 2 third joint portions 33 of the 2 third joint portion rows R3 located further outside. The high convex portion 41' of the convex portion 40 is surrounded by 4 second joining portions 32 in a circular or elliptical shape in a plan view, and a top portion 40t of the convex portion 40 is formed in the central portion of the region surrounded by the 4 second joining portions 32. The first low protrusions 42a are located between 2 second engaging portions 32 opposed in the first direction X, and the second low protrusions 42b are located between 2 second engaging portions 32 opposed in the second direction Y. In addition, each of the 4 second joining portions 32 is in a state in which a part thereof enters the 4 recessed portions 45. The convex portion 40 is separated from the adjacent other convex portions 40 by an annular concave portion including 8 joint portions 3 surrounding the convex portions 40 and a third convex portion 43 located between these joint portions 3. Although the third convex portion 43 is "convex" in the text, the height of the third convex portion 43 is lower than both the high convex portion 41 'and the low convex portion 42' constituting the convex portion 40, and therefore, these convex portions are opposed concave portions in view of these convex portions.

In addition, with respect to the projections 40 of the second-direction projection row 4Y adjacent to the second-direction projection row 4Y including the projections 40 shown in fig. 6, the first engaging portions and the first engaging portion row are opposite to the third engaging portions and the third engaging portion row. That is, the projections 40 in the second-direction projection row 4Y are surrounded by a total of 8 joints including 2 adjacent third joints 33 in the third joint row R3, a total of 4 second joints 32 of the 2 second joint rows R2 located on both sides of the third joint row, and 2 first joints 31 of the 2 first joint rows R1 located further outside.

[ constitution of side region S of composite sheet 10 ]

As shown in fig. 3, in the pair of side regions S, S of the composite sheet 10, the projections formed by the first sheet 1 projecting in the direction away from the second sheet at the locations other than the joined portions are formed in a pattern different from the pattern of the projections in the central region M. The expression that the patterns of the convex portions are different includes any of the case where only the arrangement of the convex portions is different, the case where the forms of the convex portions are different, and the case where both of them are different. The state where the convex portions are arranged differently includes a case where the distance between the convex portions is different. The state where the shape of the convex portion is different also includes the case where the shape of the convex portion in a plan view is different.

In the composite sheet 10 of the present embodiment, the arrangement and form of the protrusions are different between the pair of side regions S, S and the central region M.

Fig. 10 is an enlarged plan view of the side region S of the composite sheet 10 shown in fig. 3. Fig. 11 and 12 are sectional views taken along line III-III and IV-IV of fig. 10, respectively.

As shown in these figures, in the side region S of the composite sheet 10, the first sheet 1 constituting the side region S is formed with the first convex portions 41, the second convex portions 42, and the third convex portions 43, which are 3 kinds of convex portions having different heights from each other. These 3 kinds of projections differ in their respective heights. Specifically, the height of the second convex portion 42 is equal to or lower than that of the first convex portion 41, and the height of the third convex portion 43 is lower than that of the second convex portion 42. That is, the height of the first convex portion 41 is set to be H₁H represents the height of the second convex portion 42₂H represents the height of the third projection 43₃When, these 3 heights satisfy H₁≥H₂＞H₃The relationship (2) of (c). A plurality of projections 41, 42, and 43 are formed, respectively. The shapes of the first convex portion 41 and the second convex portion 42 in the side region S in plan view are both substantially circular. With respect to the diameter of the circle, the first protrusion 41 is larger than the second protrusion 42. The first convex portion 41 and the second convex portion 42 have a shape having a top portion in a cross section in any one of the first direction X and the second direction Y. The third convex portion 43 has a substantially rectangular shape elongated in the first direction X in plan view. The upper surface of the third projection 43 is substantially flat.

Fig. 13(a) and 13(b) are plan views showing the main part of fig. 10. As is clear from these figures, in the side region S of the composite sheet 10, 1 or more first protrusions 41 and 1 or more second protrusions 42 are connected to form an annular connecting protrusion 44. The annular coupling projection 44 is substantially annular in plan view. The annular coupling projection 44 is formed by coupling 6 first projections 41 and 2 second projections 42. Specifically, in a plan view of the composite sheet 10, a pair of first projection groups 41A each including 3 first projections 41A, 41b, and 41c arranged along the first direction X are present at positions line-symmetrical with respect to a center line CL connecting centers of 2 second projections 42a and 42b arranged at a distance from each other along the first direction X. The 3 first protrusions 41A, 41b, and 41c constituting the first protrusion group 41A are connected along the first direction X. Of the 3 first protrusions 41A, 41b, and 41c constituting the first protrusion group 41A, the first protrusions 41A and 41c located at the ends along the first direction X are located at the same position when viewed along the second direction Y. First projection 41b located at position 2 along first direction X is biased outward along second direction Y compared to other first projections 41a and 41 c. In the pair of first convex portion groups 41A, the first convex portions 41A, 41A positioned on one end portion side along the first direction X in each first convex portion group 41A are connected to the second convex portions 42a positioned on one end portion side along the first direction X in the 2 second convex portions 42a, 42 b. In the pair of first convex portion groups 41A, the first convex portions 41c and 41c positioned on the other end portion side along the first direction X in each first convex portion group 41A are connected to the second convex portions 42b positioned on the other end portion side along the first direction X in the 2 second convex portions 42a and 42 b. Thus, 1 annular coupling projection 44 is formed by a total of 8 projections of the total of 6 first projections 41a, 41b, 41c and the total of 2 second projections 42a, 42 b.

The annular coupling projections 44 are linearly arranged in a row at a predetermined distance along the first direction X in a plan view of the composite sheet 10, thereby constituting an annular coupling projection row. The annular coupling projection rows are arranged in a plurality of rows at a predetermined distance in the second direction Y. When 1 annular coupling projection row is focused, the arrangement of the annular coupling projections 44 is shifted by half a pitch between the adjacent annular coupling projection rows. When focusing attention on 1 of the plurality of annular coupling convex portions 44 constituting 1 annular coupling convex portion row, the convex portions constituting the annular coupling convex portions 44 partially overlap with the convex portions constituting the adjacent annular coupling convex portions in the front and rear thereof. For example, when focusing on 1 annular coupling projection 44A and another annular coupling projection 44B adjacent thereto along the first direction X as shown in fig. 14(a), 2 first projections 41c, 41c and 1 second projection 42B of the annular coupling projection 44A overlap with 2 first projections 41a, 41a and 1 second projection 42a of the annular coupling projection 44B. When focusing on 1 annular coupling projection row 45A and the adjacent annular coupling projection row 45B as shown in fig. 14(B), the first projections 41B and 41c of the 1 annular coupling projections 44A constituting the annular coupling projection row 45A overlap the first projections 41a and 41B of the 1 annular coupling projections 44B constituting the annular coupling projection row 45B.

As shown in fig. 13(a) and 13(b), a central protrusion 46 is formed at a substantially central portion within the ring of the annular coupling protrusion 44. The central protrusion 46 is formed in 1 ring of the 1 ring-shaped coupling protrusion 44. The central convex portions 46 are formed by the first sheet 1 protruding in a direction away from the second sheet, as in the other convex portions, and are preferably formed at intervals. The central protrusion 46 has a substantially circular shape in plan view. The diameter of the circle is substantially the same as the diameter of the second protrusion 42. In addition, as shown in fig. 12, the height H of the central protrusion 46₄Height H of second projection 42₂Are substantially identical. Height H of central protrusion 46₄Height H of the third convex part₃High. The central protrusion 46 has a shape having a top in a cross section in any of the first direction X and the second direction Y.

As shown in fig. 13(a) and 13(b), the annular coupling projection 44 and the central projection 46 located in the ring are separated by an annular recess 47. The annular recessed portion 47 is constituted by the engaging portion and the third projecting portion 43. Specifically, the joint portion is constituted by a rectangular first joint portion 31 elongated in the first direction X in plan view and a second joint portion 32 substantially square in plan view, and the annular recessed portion 47 is constituted by these joint portions 31, 32 and the 2 third convex portions 43. Although the third convex portion 43 is a "convex portion" in the text, the height of the third convex portion 43 is relatively lower than the height of both the first convex portion 41 and the second convex portion 42 constituting the annular coupling convex portion 44, and is also relatively lower than the height of the central convex portion 46, and therefore, these convex portions are opposed concave portions in view of these convex portions.

The annular recessed portion 47 is constituted by 2 first engaging portions 31 and 4 second engaging portions 32, and 2 third protruding portions 43. Specifically, as shown in fig. 13(b), in a plan view of the composite sheet 10, a pair of joint part groups 33 in which the second joint parts 32, the first joint parts 31, and the second joint parts 32 are arranged in the first direction X in the order of the second joint parts 32, the first joint parts 31, and the second joint parts 32 are present at positions that are line-symmetrical with respect to a center line CL that connects the centers of the 2 third convex parts 43 arranged at a distance from each other in the first direction X. Of the 3 joint portions 31 and 32 constituting the joint portion group 33, the position of the center of the second joint portion 32 located at the end portion in the first direction X is the same position when viewed in the second direction Y. The first joint 31 located at the 2 nd position along the first direction X is biased outward along the second direction Y as compared with the 2 second joints 32.

As shown in fig. 10, the plurality of central protrusions 46 are linearly arranged in a row at a predetermined distance along the first direction X which is one direction in the plane of the composite sheet 10, and constitute a central protrusion row. The central projection rows are arranged in a plurality of rows at a distance from each other in the second direction Y. When 1 central projection row is focused on, the arrangement of the central projections 46 is shifted by half a pitch between the central projection rows adjacent thereto. As also shown in fig. 10, the plurality of second protrusions 42 are linearly arranged in a row at a predetermined distance along the first direction X which is one direction in the plane of the composite sheet 10, and constitute a second protrusion row. The second projection rows are arranged in a plurality of rows at a distance in the second direction Y. When 1 second projection row is focused on, the arrangement of the second projections 42 is shifted by half a pitch between the adjacent second projection rows.

The second projection row and the central projection row in the side region S are arranged at the same position in a plan view of the composite sheet 10. Specifically, as shown in fig. 10, the second protrusions 42 and the central protrusions 46 are alternately and linearly arranged along the first direction X, which is one direction in the plane of the composite sheet 10. When attention is paid to the third convex portions 43 in addition to the second convex portions 42 and the central convex portions 46, these 3 types of convex portions are regularly and linearly arranged along the first direction X, which is one direction in the plane of the composite sheet 10, in the order of the second convex portions 42, the third convex portions 43, the central convex portions 46, and the third convex portions 43.

On the other hand, in the second direction Y orthogonal to the first direction X, as shown in fig. 10, the first joining portion 31, the central protrusion 46, the first joining portion 31, the first protrusion 41, the second protrusion 42, and the first protrusion 41 located on the straight line L extending along the second direction Y have a cycle, and the cycle repeats along the second direction Y.

The joining portions 3 (first to third joining portions) of the central region M and the first joining portion 31 and the second joining portion 32 in the side region S may be formed in various ways. When the first sheet 1 and the second sheet 2 are made of materials that can be heat-welded, welding using heat, ultrasonic waves, high frequencies, or the like can be used. The first sheet 1 and the second sheet 2 may be bonded to each other with an adhesive, regardless of the material. When the two sheets 1 and 2 are joined by thermal, ultrasonic, or high-frequency welding to form a joint, the joint is compacted compared to the portions other than the joint. When the sheets 1 and 2 are made of fiber sheets, the distance between fibers is shortened by densification, or the fibers lose their form, and thus the sheets become a film. In a method of manufacturing the composite sheet 10 described later, the two sheets 1 and 2 are joined by thermal fusion bonding to form a joint portion composed of a fusion bonded portion.

In the diaper 100 of the first embodiment, the composite sheet 10 having the above-described configuration is disposed on the absorbent body 14 so that the central region M is located at the central portion in the width direction Ya of the diaper and the pair of side regions S, S are located on both sides of the central region M, as shown in fig. 3, and is used as the liquid-permeable topsheet 12.

In addition, the composite sheet 10 of the diaper 100, as described above, has the joint portions formed in different patterns in the central region M and the pair of side regions S, S so that the area ratio of the joint portions 31, 32 in the side regions S is larger than the area ratio of the joint portion 3 in the central region M.

Therefore, according to the diaper 100 of the present embodiment, the boundary between the central region M of the topsheet and the side region S, S is easily folded, and the diaper is easily deformed into a boat-like shape when worn, and as a result, excellent leakage prevention performance can be obtained. Further, since the superior leakage preventing performance is achieved by making the formation patterns of the convex portions formed in the central region M and the side regions S different, the leakage preventing performance is less likely to be degraded even when the diaper 100 is stored in a state of being packed in a package bag in a compressed state.

In contrast, when the height of the convex portion in the side region S is made higher than the height of the convex portion in the central region M to improve the lateral leakage resistance, if the bag is stored in a compressed state and filled in the bag, the convex portion in the side region is crushed, and the leakage resistance is likely to be lowered. The storage referred to herein includes storage in a manufacturing plant, storage in a distribution stage (including display states of stores), storage in a general consumer home, and the like.

From the viewpoint of improving the deformability of the deformation into the boat shape, the difference (Es-Em, percentage) between the area ratio Es (%) of the joint portion in the side region S and the area ratio Em (%) of the joint portion in the central region M is preferably 5% or more, and more preferably 10% or more. The area ratio Es of the joint in the side region S is preferably 5% or more, more preferably 10% or more, further preferably 50% or less, more preferably 30% or less, further preferably 5% or more and 50% or less, more preferably 10% or more and 30% or less, on the assumption that it is larger than the area ratio Em. The area ratio Em of the joint in the central region M is preferably 30% or less, more preferably 20% or less, further preferably 3% or more, more preferably 5% or more, further preferably 3% or more, 30% or less, more preferably 5% or more, and 20% or less, on the premise that it is smaller than the area ratio Es.

(method of calculating area ratio of bonded portion)

The area ratio of the joint portion in a region of 1 cycle in which the arrangement of the joint portion and the convex portion is regularly repeated along the first direction X and the second direction Y is calculated. The area of the joint was measured as follows: the composite sheet 10 was observed from the second sheet 2 side at a magnification of 20 to 100 times using a microscope (VHX-1000 manufactured by keyence corporation), and the area (cm) of the 1-cycle region was measured using an image analyzer²) And area (cm) of joint²) And [ (area of joint)/(area of 1 cycle)]× 100, respectively.

From the viewpoint of improving the deformability of the boat-shaped composite sheet 10, the bending rigidity of the side regions S is preferably higher than that of the central region M. Flexural rigidity was measured according to JIS P8126. The specific method is as follows.

(method of measuring bending rigidity)

A test piece was prepared by cutting the composite sheet 10 in the first direction X to 30mm and in the second direction Y to 110mm, a cylindrical shape having a height of 30mm was formed with the first sheet side as the outer side, and the upper end and the lower end were fixed to each other with an overlapping width of 10mm by ultrasonic sealing to obtain a measurement sample. The maximum load exhibited when the circumference of the upper end was measured by compression at a compression rate of 10mm/min in the cylinder direction was read using a compression tester. The average of 5 samples was taken as the flexural rigidity value.

The ratio of the bending rigidity of the side region S to the bending rigidity of the central region M is preferably 1.1 or more, more preferably 1.2 or more. The bending stiffness of the side region S is preferably 10cN or more, more preferably 15cN or more, further preferably 50cN or less, more preferably 40cN or less, further preferably 10cN or more and 50cN or less, and more preferably 15cN or more and 40cN or less, on the premise that the bending stiffness of the central region M is greater. The bending stiffness of the central region M is preferably 40cN or less, more preferably 30cN or less, further preferably 5cN or more, more preferably 10cN or more, further preferably 5cN or more and 40cN or less, and more preferably 10cN or more and 30cN or less, on the assumption that the bending stiffness is smaller than that of the side regions S.

In addition, in the diaper 100 of the first embodiment, since the convex portions 40 of the central region M and the convex portions 41 to 43, 46 of the side regions S are formed by deforming the first sheet 1 so as to be apart from the second sheet 2, the feeling (skin feeling) in the central region M and the side regions S is also excellent.

From the viewpoint of obtaining a good effect even after storage in a state of being packed in a compressed state in a package bag, it is preferable that the height of the convex portions 40 of the central region M and the height of the convex portions 41 to 43, 46 of the side regions S are the same, and in the composite sheet 10 described above, the height H1 of the convex portions 40 of the central region M is preferably the same as the height H1 of the first convex portions 41 of the side regions S which are the largest. The expression that the heights are the same here includes substantially the same case, for example, the case where the height of one convex portion is 90% to 110% of the height of the other convex portion, except for the case where the heights are the same.

In the diaper 100 of the first embodiment, the first joint sections 31 formed in the side regions S have a length in the first direction X longer than the length in the second direction Y, and the length in the first direction X is longer than the length in the first direction X of any of the joint sections 31 to 33 formed in the joint section 3 in the central region M.

By forming such longitudinal joint portions 31 in the side regions S, the diaper 100 can be easily folded in the vicinity of the boundaries between the central region M and the side regions S, and when the crotch portion and the like of the diaper are compressed in the width direction Ya by the thigh portions, the diaper can be gently compressed while maintaining the boat-like shape, and therefore, leakage of loose stool, urine, and the like during wearing is less likely to occur. Such an effect can be obtained similarly even in the case where the length in the first direction X of all the joint portions (joint portions 31) formed in the side regions S is longer than the length in the first direction X of any of the joint portions 31 to 33 formed in the central region M, as in the composite sheet 10A shown in fig. 24.

The length of the lengthwise joint portion (first joint portion 31) formed in the joint portion of the side region S, which is longer in the first direction X than any joint portion formed in the central region M, is preferably 1.2 times or more, more preferably 1.5 times or more, further preferably 5 times or less, more preferably 3.5 times or less, further preferably 1.2 times or more and 5 times or less, and further preferably 1.5 times or more and 3.5 times or less, of the length in the first direction in the joint portion (joint portions 31 to 33) formed in the central region M, which has the largest length in the first direction X.

In the diaper 100 of the first embodiment, as described above, the convex portions 40 are arranged in a staggered manner in the central region M, and the annular coupling convex portions 44, which are formed by annularly coupling the 6 first convex portions 41 and the 2 second convex portions 42, are arranged in a staggered manner in the side region S. The central protrusions 46 are also arranged in a staggered manner in the side regions S.

By disposing the convex portions 40 in the center region M in a staggered manner and disposing the annular coupling convex portions 44 formed by annularly coupling the convex portions 41 and 42 in a staggered manner also in the side regions S, the diaper 100 is more easily deformed into a boat-like shape along the crotch of the wearer, and leakage prevention of loose stools or urine from the front, back, and sides is further improved. Such an effect can be obtained similarly in the case where the convex portions 40 are arranged in a staggered manner in the central region M and the convex portions 41 are also arranged in a staggered manner in the side regions S, as in the composite sheet 10A shown in fig. 24.

In the diaper 100 of the first embodiment, the absorber 14 is composed of an absorbent core 14a and a core sheet covering the absorbent core 14a, and the absorbent core 14a has notch portions 14C, 14C which are recessed in a plan view and on which a forming material of the absorbent core 14a is not disposed, as shown in fig. 1, on both sides of the crotch portion C of the diaper. As shown in fig. 3, the left and right side regions S, S of the composite sheet 10 overlap the left and right cutout portions 14c, respectively. The portion overlapping the notch portion 14c is overlapped with the side portion region S, and the portion located outward of the inner edge of the notch portion 14c of the diaper 100 stands up toward the skin of the wearer, and is easily deformed into a boat shape more suitable for the crotch portion of the wearer. This further improves the leak resistance. The side region S preferably overlaps at least a part of the notch portion 14c, and more preferably overlaps the entire notch portion 14 c.

The depth d1 (see fig. 1) of the notch 14c is preferably 2mm or more, more preferably 8mm or more, and is preferably 50mm or less, more preferably 35mm or less, and is preferably 2mm or more and 50mm or less, more preferably 8mm or more and 35mm or less. The depth d1 of the notch 14c is measured along the width direction of the diaper.

Instead of forming the notches 14c and 14c on both sides of the absorbent core 14a, it is also preferable to provide through-holes spaced from the side edges of the absorbent core 14a on both sides of the longitudinal center line (not shown) of the absorbent core 14a, and to arrange the side regions S of the composite sheet 10 so as to overlap the through-holes.

Since the portion overlapping the through-portion overlaps the side region S, the portion of the diaper 100 located outward of the inner edge of the through-portion rises toward the skin of the wearer and is easily deformed into a boat shape more suitable for the crotch of the wearer. The side region S preferably overlaps at least a part of the through-hole, and more preferably overlaps the entire region of the through-hole.

In the diaper 100 of the first embodiment, sheets 15 for forming three-dimensional gathers, in which elastic members 15a are fixed to inner side edges, are disposed on both sides in the longitudinal direction, and as shown in fig. 1, the inner side edges of the sheets 15 are fixed to side regions S of the composite sheet 10.

With this configuration, the diaper 100 is curved in the longitudinal direction, and is more easily formed into a boat shape. The elastic member 15a may be absent in a portion of the inner edge of the sheet 15 which is fixed to the side region S.

From the viewpoint of more reliably obtaining one or two or more of the above-described effects, the central region M of the composite sheet 10 preferably has the following configuration.

The arrangement pitch (distance between center points) P1 of the lands 3 in the land row in which the first land row LR1 is formed and the second land row LR2 is formed is preferably 1.1 times or more, more preferably 1.5 times or more, further preferably 10 times or less, more preferably 5 times or less, further preferably 1.1 times or more, 10 times or less, more preferably 1.5 times or more, and 5 times or less, of the shortest distance LL of the adjacent lands. Further, the distance between the center lines of the adjacent lattice-forming first joint rows LR1 and the distance between the center lines of the adjacent lattice-forming second joint rows LR2 are preferably 2mm or more, more preferably 3mm or more, further preferably 30mm or less, more preferably 20mm or less, further preferably 2mm or more, 30mm or less, more preferably 3mm or more, and 20mm or less, respectively.

The convex portion 40 formed in the central region M preferably has a shape in which the low convex portion 42 'extends in four directions from the high convex portion 41' portion of the central portion, as described above.

In the case where the convex portion 40 formed in the central region M is in such a form, even if the convex portion is bent in the longitudinal direction during wearing so that the cross section along the longitudinal direction becomes an arc shape, the low convex portion 42b of the convex portion 40 extending from the high convex portion 41 'in the first direction X corresponding to the article longitudinal direction Xa is preferentially crushed, and the high convex portion 41' is less likely to be crushed. Similarly, even if the diaper 100 is bent in the width direction during wearing so that the cross section along the width direction becomes an arc, the low convex portion 42a of the convex portion 40 of the topsheet 12 made of the composite sheet 10 extending from the high convex portion 41 'in the second direction Y corresponding to the article width direction Yb is preferentially crushed, and the high convex portion 41' is less likely to be crushed. Due to such an action, the central region M can obtain a good skin feel and the stuffiness resistance is also improved.

The composite sheet 10 of the present embodiment has a pair of first low protrusions 42a extending from the high protrusions 41 'in one direction of the sheet in-plane direction, and another pair of second low protrusions 42b extending from the high protrusions 41' in the other direction orthogonal to the one direction of the sheet in-plane direction, as the 4 low protrusions 42 constituting the protrusions 40, and the extension length L4 from the high protrusion 41 'to the outermost end of the first low protrusion 42a is longer than the extension length L4 from the high protrusion 41' to the outermost end of the second low protrusion 42 b. By forming the low protrusions 42 having different extension lengths L4 from the high protrusions 41', it is possible to design a direction in which the topsheet 12 is relatively easy to bend and a direction in which the topsheet 12 is relatively difficult to bend, and for example, by aligning the direction in which the topsheet 12 is easy to bend with the direction in which the absorbent article or topsheet is easy to bend or bend during wearing, it is possible to obtain a disposable diaper or the like which can be gently bent to exhibit good fit and the like, in which the convex portions of the protrusions and recesses are not easily crushed, and in which each effect due to the protrusions and recesses can be stably exhibited.

The above-described extending length L4 of the first low projecting portion 42a is a length L4a from the midpoint on the line of the straight line L3X to the edge portion of the joining portion 31 closest to the extending direction front end portion of the first low projecting portion 42a, where the straight line L3X is a straight line connecting the centers of 2 joining portions 32 adjacent to each other across the first low projecting portion 42a in the joining portion row extending in the direction (first direction X) orthogonal to the extending direction (second direction Y) of the first low projecting portion 42 a. The 2 joint portions 32 adjacent to each other with the first low projecting portion 42a interposed therebetween may be joint portions adjacent to each other with the recessed portion K (see fig. 9 (a)) formed at the boundary portion between the first low projecting portion 42a and the high projecting portion 41 interposed therebetween.

The above-described extending length L4 of the second low projecting portion 42b is a length L4b from the midpoint on the line of the straight line L3Y to the edge portion of the joining portion 33 closest to the extending direction distal end portion of the second low projecting portion 42b, where the straight line L3Y is a straight line connecting the centers of 2 joining portions 32 adjacent to each other across the second low projecting portion 42b in the joining portion row extending in the direction (second direction Y) orthogonal to the extending direction (first direction X) of the second low projecting portion 42 b. The 2 joint portions 32 adjacent to each other with the second low projecting portion 42b interposed therebetween may be joint portions adjacent to each other with the recessed portion K [ see fig. 9(b) ] formed at the boundary portion between the second low projecting portion 42b and the high projecting portion 41 interposed therebetween.

In the central region M of the composite sheet 10 of the first embodiment, a pair of first low protrusions 42a having a relatively long extended length extends from the high protrusions 41 'in the second direction Y corresponding to the article width direction Ya, and a pair of second low protrusions 42b having a relatively short extended length extends from the high protrusions 41' in the first direction X corresponding to the article length direction Xa. This means that the direction in which bending easily occurs in wearing coincides with the direction in which bending easily occurs in the front sheet 12. This makes it possible to bend gently to exhibit good fit and the like, and the convex portions of the irregularities are less likely to be crushed, and the effects of the irregularities can be stably exhibited.

The high protrusions 41' preferably have recesses K recessed in the inner direction of the protrusions 40 at the boundary with the low protrusions 42 as shown in fig. 9(a) or 9 (b).

The height H2 of the low protrusions 42 'is preferably 30% or more, more preferably 40% or more, and further preferably 80% or less, more preferably 70% or less, specifically preferably 30% or more and 80% or less, more preferably 40% or more and 70% or less of the height H1 of the high protrusions 41'.

The height H2 of the low protrusions 42' is measured by a digital microscope (manufactured by KEYENCE CORPORATION) and the height is determined as the shortest distance from the lower surface of the second sheet 2 to the upper surface of the first sheet 1 at the midpoint position on the line of the straight line L3x and the line of the straight line L3y of the row of the bonding portions connected between the centers of the bonding portions 32 sandwiching the low protrusions.

The height H1 of the high convex portion 41' is preferably 0.5mm or more, more preferably 1mm or more, and is preferably 5mm or less, more preferably 4mm or less, and specifically preferably 0.5mm or more and 5mm or less, more preferably 1mm or more and 4mm or less. The height H2 of the low projecting portion 42 is preferably 0.2mm or more, more preferably 0.4mm or more, and is preferably 3mm or less, more preferably 2.5mm or less, specifically preferably 0.2mm or more and 3mm or less, more preferably 0.4mm or more and 2.5mm or less.

The distance L5 between the recessed portions 45 facing each other with the high projecting portion 41' interposed therebetween is preferably 50% or more, more preferably 60% or more, and preferably 180% or less, more preferably 110% or less, specifically preferably 50% or more and 180% or less, and more preferably 60% or more and 110% or less of the shorter length of the length Lx of the projecting portion 40 in the first direction X and the length Ly of the second direction Y. The length Lx of the convex portion 40 in the first direction X and the length Ly of the convex portion in the second direction Y are preferably 1mm or more, more preferably 1.5mm or more, and preferably 30mm or less, more preferably 15mm or less, specifically preferably 1mm or more and 30mm or less, more preferably 1.5mm or more and 15mm or less, respectively.

The length of the joint 3 (first to third joints) along the first direction X is preferably 0.1mm or more, particularly preferably 0.5mm or more, preferably 5mm or less, particularly preferably 3mm or less, more specifically preferably 0.1mm or more and 5mm or less, particularly preferably 0.5mm or more and 3mm or less.

The distance between the adjacent joint rows (first to third joint rows) in the first direction is preferably 0.2mm or more, particularly preferably 0.8mm or more, preferably 10mm or less, particularly preferably 5mm or less, more specifically preferably 0.2mm or more and 10mm or less, particularly preferably 0.8mm or more and 5mm or less.

The length of the joint portions (first to third joint portions) along the second direction Y is preferably 0.1mm or more, particularly preferably 0.5mm or more, preferably 5mm or less, particularly preferably 3mm or less, more specifically preferably 0.1mm or more and 5mm or less, particularly preferably 0.5mm or more and 3mm or less.

The distance between adjacent joint rows (first to third joint rows) in the second direction is preferably 0.2mm or more, particularly preferably 0.8mm or more, preferably 10mm or less, particularly preferably 5mm or less, more specifically preferably 0.2mm or more and 10mm or less, particularly preferably 0.8mm or more and 5mm or less.

From the viewpoint of more reliably obtaining one or two or more of the above-described effects, the side region S of the composite sheet 10 preferably has the following configuration.

Height H of first convex portion 41₁Preference is given toIs 0.5mm or more, particularly preferably 1mm or more, preferably 5mm or less, particularly preferably 4mm or less. For example, the height H of the first convex portion 41₁Preferably 0.5mm to 5mm, more preferably 1mm to 4 mm. Height H of second convex portion 42₂At a height H equal to that of the first convex portion 41₁On condition that the thickness is equal to or lower than the above range, the thickness is preferably 0.3mm or more, particularly preferably 0.6mm or more, preferably 4mm or less, particularly preferably 3mm or less. For example, the height H of the second protrusion 42₂Preferably 0.3mm to 4mm, more preferably 0.6mm to 3 mm. Height H of third projection 43₃At a height H lower than that of the second convex portion 42₂Preferably 0.2mm or more, particularly preferably 0.4mm or more, preferably 3mm or less, and particularly preferably 2.5mm or less. For example, the height H of the third convex portion 43₃Preferably 0.2mm to 3mm, more preferably 0.4mm to 2.5 mm. Height H of central protrusion 46₄Preferably 0.3mm or more, particularly preferably 0.6mm or more, preferably 4mm or less, particularly preferably 3mm or less. Such as the height H of the central protrusion 46₄Preferably 0.3mm to 4mm, more preferably 0.6mm to 3 mm.

Height H of each of the projections 41, 42, 43, 46₁、H₂H3, H4 are as shown in fig. 3 and 4, defined as the distance from the lower surface of the second sheet 2 to the upper surface of the first sheet 1. The heights H1, H2, H3, and H4 were measured as follows.

[ method of measuring height of convex part ]

The sample was cut with a sharp blade, and the cut end face was observed to measure the shortest distance between the lower surface of the second sheet 2 and the upper surface of the top of each convex portion. The obtained value was defined as the height of each convex portion. When the measurement is difficult with the naked eye, the measurement can be performed by observing a cross section of the cut sample with a microscope (VHX-1000 manufactured by KEYENCE CORPORATION) at a magnification of 20 to 100 times. For example, when a diaper sample in a state of being packed in a package under compression is measured, a sample in which a front sheet is peeled off from the diaper and left for 1 day or more is measured in the same manner as the above-described operation to obtain a numerical value. The height of each convex portion was measured under no load.

For the same reason as the reason for setting the heights of the respective convex portions 41, 42, 43, 46 as described above, the diameter of the first convex portion 41 in a plan view is preferably 1mm or more, particularly preferably 2mm or more, preferably 20mm or less, particularly preferably 10mm or less. For example, the diameter of the first projection 41 is preferably 1mm to 20mm, more preferably 2mm to 10 mm. The diameter of the second projection 42 is preferably 0.5mm or more, particularly preferably 1mm or more, preferably 15mm or less, particularly preferably 5mm or less. For example, the diameter of the second projection 42 is preferably 0.5mm to 15mm, more preferably 1mm to 5 mm. The diameter of the third projection 43 is preferably 0.2mm or more, particularly preferably 0.5mm or more, preferably 10mm or less, particularly preferably 3mm or less. For example, the diameter of the third projection 43 is preferably 0.2mm to 10mm, more preferably 0.5mm to 3 mm. The diameter of the central protrusion 46 is preferably 0.5mm or more, particularly preferably 1mm or more, preferably 15mm or less, particularly preferably 5mm or less. For example, the diameter of the central protrusion 46 is preferably 0.5mm to 15mm, more preferably 1mm to 5 mm.

For the same reason as the reason for setting the diameters of the respective convex portions as described above, the length of the first joining portion 31 along the first direction X in a plan view is preferably 0.5mm or more, particularly preferably 1mm or more, preferably 10mm or less, particularly preferably 5mm or less. For example, the length of the first joint portion 31 along the first direction X is preferably 0.5mm to 10mm, and more preferably 1mm to 5 mm. On the other hand, the length of the first joint portion 31 along the second direction Y is preferably 0.1mm or more, particularly preferably 0.5mm or more, preferably 5mm or less, particularly preferably 3mm or less. For example, the length of the first joint portion 31 along the second direction Y is preferably 0.1mm to 5mm, and more preferably 0.5mm to 3 mm.

The length of one side of the second joint portion 32 is preferably 0.1mm or more, particularly preferably 0.5mm or more, preferably 5mm or less, particularly preferably 3mm or less. For example, the length of one side of the second joint portion 32 is preferably 0.1mm to 5mm, and more preferably 0.5mm to 3 mm.

Next, a preferred method for manufacturing the composite sheet 10 having the above-described structure will be described with reference to fig. 15 to 23. The method for manufacturing the composite sheet 10 includes a shaping step of rotating a first roller 111 and a second roller 112 having a peripheral surface formed into a concavo-convex shape in which the concavo-convex shape is formed to mesh with the concavo-convex shape of the first roller, in opposite directions to each other, as shown in fig. 15, and supplying the first sheet 1 to the meshing portion of the both rollers 111, 112 to shape the concavo-convex shape of the first sheet 1. The method for manufacturing the composite sheet 10 further includes a joining step of, after the shaping step, moving the first sheet 1 from the nip portion while keeping the first sheet along the circumferential surface portion of the first roller 111, supplying the second sheet 2 so as to overlap the first sheet 1, and heating and pressing the two sheets 1 and 2 between the convex portion of the first roller 111 and the first and second heating rollers 113 and 114 to join the sheets partially.

As shown in fig. 15, the second roller 112, the first heat roller 113, and the second heat roller 114 are disposed opposite to the circumferential surface of the first roller 111. The second roller 112, the first heating roller 113, and the second heating roller 114 are arranged in this order from the upstream side to the downstream side in the rotation direction R of the first roller 111, as the second roller 112, the first heating roller 113, and the second heating roller 114. Details of the first roller 111 and the second roller 112 having the uneven circumferential surface will be described later. The first heating roller 113 and the second heating roller 114 are smooth anvil rollers having no unevenness on the circumferential surfaces thereof, respectively.

First, the first sheet 1 is pulled out from a stock roll (not shown) of the first sheet 1. Then, the second sheet 2 is pulled out from a stock roll (not shown) of the second sheet 2. Then, as shown in fig. 15, the pulled first sheet 1 is caused to bite into the nip portion between the first roller 111 and the second roller 112, and the first sheet 1 is shaped into a concave-convex shape. At this time, the first roller 111 is attracted from its circumferential surface toward the inside of the roller, and the uneven shape formation of the first sheet 1 is promoted. The suction mechanism in the first roller 111 will be described later.

Next, as shown in fig. 15, the first sheet 1 is continuously sucked to the circumferential surface of the first roller 111, the shaped state is maintained, the second sheet 2 is superimposed in this state, and the superimposed sheet is nipped between the first roller 111 and the first heating roller 113 having a smooth circumferential surface. At this time, both the first roller 111 and the first heating roller 113 or only the first heating roller 113 is heated to a predetermined temperature. As a result, the first sheet 1 and the second sheet 2 positioned on the convex portion of the first roller 111, that is, on the tooth crest of each tooth of the gears (see fig. 16) described later are joined by thermal welding, and the joint portions 31 to 33 are formed.

Next, the superimposed body of the first sheet 1 and the second sheet 2 joined by thermal fusion is moved while being continuously sucked and held on the circumferential surface of the first roller 111, and the superimposed body is sandwiched between the first roller 111 and the second hot roller 114 having a smooth circumferential surface. At this time, both the first roller 111 and the second heating roller 114 or only the second heating roller 114 is heated to a predetermined temperature. Thus, in the joint portions 31 to 33 positioned on the convex portion of the first roller 111, that is, on the teeth of the gears, the materials constituting the first sheet 1 and the second sheet 2, for example, thermoplastic resins, are melted, and the joint portions 31 to 33 can be formed more firmly. In this way, the intended composite sheet 10 can be continuously manufactured.

In the production of the composite sheet 10, the following members are used as the first roller 111 and the second roller 112: the central region forming portion that forms the central region M described above on the composite sheet 10 is provided in the central portion in the axial direction, and the side region forming portions that form the side regions S, S described above on the composite sheet 10 are provided on both sides of the central portion in the axial direction.

Fig. 16 is a perspective view showing a state in which the central region of the first roller 111 shown in fig. 15 is partially exploded. Fig. 17 is a perspective view showing a state in which the side region of the first roller 111 shown in fig. 15 is partially exploded. The first roller 111 is formed by combining a plurality of first gears 121, second gears 122, and spacers 123, concentrically fitted on a core 124, and gathered into a roller shape. In the first roller 111, the pitch of the teeth of the first gear 121 and the second gear 122, the arrangement order of the gears 121, 122 and the spacers 123, and the like are different between the central region forming portion and the side region forming portion. In any portion of the central region forming portion and the side region forming portion, the axial center of the 2 kinds of gears 121 and 122 and the spacer 123 is opened, and the rotary shaft (not shown) is inserted into the opening. The 2-type gears 121 and 122 and the spacer 123 are each formed with a notch (not shown), and a plug (not shown) is inserted into the notch. This can prevent the 2 kinds of gears 121 and 122 and the spacer 123 from idling.

The spacer 123 is formed in a shape having a bar (beam)125 as a plurality of protrusions extending radially from the center. The lengths of the rods 125 in the shim 123 are all the same. For convenience, when a diameter of a circle virtually formed by connecting the leading ends of the respective bars 125 is defined as an addendum circle diameter, the addendum circle diameter is smaller than a dedendum circle diameter of the first and second gears 121 and 122.

Each of the gears 121 and 122 has a plurality of openings 126 and 127 formed so as to surround an opening for inserting the center of a rotary shaft (not shown). The openings 126 and 127 have the same diameter and are formed at equal distances from the center of the gear. The angles formed by the adjacent openings 126 and 127 and the center of the gear are substantially equal. The number of the openings 126 and 127 in the gears 121 and 122 is the same as the number of the bars 125 in the spacer 123. When the gears 121 and 122 and the spacer 123 are assembled, the gears 121 and 122 and the spacer 123 are arranged so that the openings 126 and 127 are located between the adjacent bars 125 in the spacer 123. That is, the openings 126 and 127 are located in a substantially V-shaped region formed by the central portions of the 2 adjacent bars 125 and spacers 123. In fig. 16, the substantially V-shaped region includes all of the regions of the openings 126 and 127, but instead, only a part of the openings 126 and 127 may be included in the substantially V-shaped region. The substantially V-shaped portion corresponds to a concave portion in the first roller 111 having a concave-convex shape on the circumferential surface. On the other hand, the convex portions of the concave-convex shape correspond to the tooth tops and the tooth bottoms of the gears 121 and 122.

When the gears 121 and 122 and the spacer 123 are assembled as described above, the opening 126 of the first gear 121 and the opening 127 of the second gear 122 are connected in the axial direction of the first roller 111, and a plurality of suction paths (not shown) extending in the axial direction are formed inside the first roller 111. By connecting the suction path to a suction device provided outside the roller 111 and operating the suction device, the first roller 111 can be sucked from a concave portion formed in the circumferential surface thereof to the inside.

Fig. 18 shows a state in which the circumferential surface plane of the central region forming portion of the first roller 111 is developed. In the figure, the direction indicated by the arrow U is the rotational direction of the first roller 111, and the direction indicated by the arrow V is the axial direction of the first roller 111. In the figure, the rectangular areas indicated by the fine dots indicate the tooth tops of the gears 121 and 122. As shown in the figure, 8 parts of the first gear 121, the spacer 123, the second gear 122, the spacer 123, the first gear 121, the spacer 123, the second gear 122, and the spacer 123 are grouped in the order of the first gear 121, the spacer 123, the second gear 122, the spacer 123, the first gear 121, the spacer 123, the second gear 122, and the spacer 123 as 1 cycle T₁The central region forming part of the first roller 111 has the period T₁Repeating the above steps to form an aggregate structure.

In fig. 18, the tooth crest surfaces indicated by fine dots are predetermined positions for forming the joint portions 31 to 33 in the composite sheet 10. Specifically, the tooth crest of the tooth 121a of the first gear 121 is a predetermined position where the first joint portion 31 or the third joint portion 33 is formed. The tooth top surface of the tooth 122a of the second gear 122 is a predetermined position where the second joint 32 is formed. The gears 121, 122 and the spacer 123 are appropriately arranged to obtain the arrangement pattern of the engaging portions 31 to 33 shown in FIG. 4 described earlier.

In fig. 18, the first roll concave region 140A is a predetermined position for forming the convex portion 40 in the intended composite sheet 10, and the first roll third concave region 143A is a predetermined position for forming the third convex portion 43 in the intended composite sheet 10.

Fig. 19 shows a state in which the circumferential surface of the second roller 112, which is in a meshing relationship with the central region forming portion of the first roller 111, is developed in a plane. In the figure, the direction indicated by the arrow U is the rotational direction of the second roller 112, and the direction indicated by the arrow V is the axial direction of the second roller 112.

As shown in fig. 19, the central region forming portion of the second roller 112 is constituted by an aggregate including the third gear 131 and the fourth gear 132. In the figure, the rectangular regions indicated by thick dots indicate the tooth tops of the gears 131 and 132. The second roller 112 may not have an attraction mechanism. Therefore, the openings 126, 127 formed in the first gear 121 and the second gear 122 of the first roller 111 do not need to be formed in the gear of the second roller 112.

As shown in fig. 19, 4 members of the third gear 131, the fourth gear 132, the third gear 131, and the fourth gear 132 are grouped in the order of the third gear 131, the fourth gear 132, the third gear 131, and the fourth gear 132 as 1 cycle T₂The period T is provided in the central region of the second roller 112₂Repeating the above steps to form an aggregate structure.

In fig. 19, the second roll-protrusion 140B is formed by the teeth 131a of the third gear 131 and the teeth 132a of the 2 adjacent fourth gears 132 on both sides thereof. In a state where the first roller 111 and the second roller 112 are engaged with each other, the second roller convex portion 140B is fitted into the first roller concave portion region 140A.

Fig. 20 shows a state in which the convex portion of the second roller 112 is in planar contact with the circumferential surface of the first roller 111. In the figure, rectangular areas indicated by fine dots indicate tooth tops of the gears 121, 122 in the first roller 111. In addition, the rectangular regions indicated by thick dots indicate tooth tops of the gears 131 and 132 in the second roller 112. As can be seen from this figure, the second roll-protrusion 140B enters the first roll-recess region 140A. In contrast, the convex portion of the second roller 112 does not enter the first roller third concave portion 143A.

Fig. 21 shows a state in which the circumferential surface plane of the side region forming portion of the first roller 111 is developed. In the figure, the direction indicated by the arrow U is the rotational direction of the first roller 111, and the direction indicated by the arrow V is the axial direction of the first roller 111. In the figure, the rectangular areas indicated by the fine dots indicate the tooth tops of the gears 121 and 122. As shown in the figure, 12 parts of the first gear 121, the spacer 123, the first gear 121, the second gear 122, the spacer 123, the second gear 122, the first gear 121, the spacer 123, the first gear 121, the second gear 122, the spacer 123 and the second gear 122 are arranged according to the first gear 121, the spacer 123, the first gear 121, the second gear 122, the spacer 123, the second gear 122, the first gear 121, the spacer 121,The gasket 123, the first gear 121, the second gear 122, the gasket 123, and the second gear 122 are sequentially gathered as 1 period T₁The side region forming part of the first roller 111 has the period T₁Repeating the above steps to form an aggregate structure.

In fig. 21, the tooth tops indicated by fine dots are predetermined positions for forming the joint portions 31 and 32 of the side region S in the intended composite sheet 10. Specifically, the tooth crest of the tooth 121a of the first gear 121 is a predetermined position where the second joint 32 is formed. The tooth top surface of the tooth 122a of the second gear 122 is a predetermined position where the first joint portion 31 is formed. The respective gears 121, 122 and the spacers 123 are appropriately arranged to obtain the arrangement pattern of the engaging portions 31, 32 shown in fig. 2 described earlier.

In fig. 21, a first roller central concave portion region 146A surrounded by 4 teeth 121a of the first gear 121 and 2 teeth 122a of the second gear 122 is a predetermined position for forming the central convex portion 46 in the composite sheet 10 of interest. The first roller first concave region 141A surrounded by 1 tooth 122a and 2 teeth 121A arranged in the U direction at a distance in the V direction is a predetermined position for forming the first convex portion 41 in the side region S of the composite sheet 10 of interest. The first roller second concave region 142A surrounded by the 4 teeth 121a is a predetermined position for forming the second convex portion 42 in the side region S of the composite sheet 10. The first roller third concave region 143A between the 2 teeth 121a arranged at a distance in the V direction with the spacer 123 interposed therebetween is a predetermined position for forming the third convex portion 43 in the side region S of the composite sheet 10 of interest.

Fig. 22 shows a state in which the circumferential surface of the second roller 112, which is in a meshing relationship with the side region forming portion of the first roller 111, is developed in a plane. In the figure, the direction indicated by the arrow U is the rotational direction of the second roller 112, and the direction indicated by the arrow V is the axial direction of the second roller 112. In the figure, the rectangular regions indicated by thick dots indicate the tooth tops of the gears 124 and 122.

As shown in fig. 22, the third gear 124, the spacer 123, the second gear 122, the spacer 123, the third gear 124, the spacer 123, the second gear 122, and the second gear are coupled to each other122. The 10 parts of the spacer 123 are grouped in the order of the third gear 124, the spacer 123, the second gear 122, the spacer 123, the third gear 124, the spacer 123, the second gear 122, and the spacer 123 as 1 cycle T₂The side region forming part of the second roller 112 has the period T₂Repeating the above steps to form an aggregate structure. Constituting period T₂The total thickness of the 10 members and the formation period T in the first roller 111₁The total thickness of the 12 members is the same.

In fig. 22, the second roller central protrusion 146B and the second roller second protrusion 142B are formed by the teeth 124a of the third gear 124. The second roller center convex portions 146B and the second roller second convex portions 142B are alternately arranged along the U direction. In addition, the second roller first convex portion 141B is formed by the teeth 122a of the second gear 122. In a state where the first roller 111 and the second roller 112 are engaged with each other, the second roller first convex portion 141B is fitted into the first roller first concave portion region 141A. The second roller second convex portion 142B is fitted to the first roller second concave portion region 142A. And the second roller central protrusion 146B is fitted with the first roller central recess region 146A.

Fig. 23 shows a state in which the convex portion of the second roller 112 is in planar contact with the circumferential surface of the side region forming portion of the first roller 111. In the figure, rectangular areas indicated by fine dots indicate tooth tops of the gears 121, 122 in the first roller 111. The rectangular regions indicated by thick dots indicate the tooth tops of the gears 124 and 122 in the second roller 112. As can be seen from this figure, the second roller first convex portion 141B enters the first roller first concave portion region 141A. The second roller second convex portion 142B enters the first roller second concave portion region 142A. Also, the second roller central convex portion 146B enters the first roller central concave portion region 146A. In contrast, the convex portion of the second roller 112 does not enter the first roller third concave portion 143A.

Then, in the first roller 111 and the second roller 112, the second roller convex portions 140B enter the first roller concave portion regions 140A in the central region forming portion, whereby the first sheet 1 (not shown) is pushed into the first roller 111, and the three-dimensional shape corresponding to the convex portions 40 can be formed.

In the first roller 111 and the second roller 112, the second roller first convex portion 141B enters the first roller first concave portion region 141A in the side region forming portion, whereby the first sheet 1 (not shown) is pushed into the first roller 111, and the three-dimensional shape corresponding to the first convex portion 41 can be formed. Further, the second roller second convex portions 142B enter the first roller second concave regions 142A, and the first sheet 1 (not shown) is pushed into the first roller 111, whereby the three-dimensional shape corresponding to the second convex portions 42 can be formed. Further, the second roller center convex portion 146B enters the first roller center concave portion region 146A, and the first sheet 1 (not shown) is pushed into the first roller 111, whereby the three-dimensional shape corresponding to the center convex portion 46 can be formed. In the first roller third concave region 143A, the first sheet 1 (not shown) is sucked into the third concave region 143A by the suction from the third concave region 143A into the first roller 111, and the three-dimensional shape forming can be performed.

Thereafter, the second sheet 2 is bonded to the first sheet 1 after the stereolithography, thereby obtaining the intended composite sheet 10.

The composite sheet 10 obtained as described above is introduced into a production line of the diaper 100 and used as the topsheet 12 of the disposable diaper 100 by a known method.

Next, a disposable diaper according to a second embodiment will be described. In the disposable diaper of the second embodiment, the configuration of the central region M of the composite sheet 10A constituting the topsheet is the same as that of the central region M of the composite sheet 10 used in the first embodiment, and the configuration of the side regions S, S is different.

The second embodiment is mainly explained about differences from the first embodiment, and explanations of the same points are omitted. The description of the first embodiment can be applied as appropriate to the points not specifically described.

In the composite sheet 10A used as the topsheet in the second embodiment, as a joint portion formed by partially joining the first sheet 1 and the second sheet 2 stacked together, as shown in fig. 27, a longitudinal joint portion 31 having a longitudinal shape in which a length L3 along the first direction X is longer than a length L1 along the second direction Y is formed. The longitudinal joint portions 31 are each formed in a rectangular shape, and each side of the rectangular shape coincides with the first direction X or the second direction Y. In the composite sheet 10A, all the joints are the longitudinal joints 31. As shown in fig. 26, the composite sheet 10A has a plurality of second direction joint rows R in which the longitudinal joints 31 are regularly arranged at 2 kinds of intervals L2 and L4 in the second direction Y, and the second direction joint rows R are formed in a plurality of rows in the first direction X. More specifically, the second direction joint row R includes a first interval L2 and a second interval L4 wider than the first interval L2 as the intervals between the longitudinal joints 31 in the second direction Y, and the plurality of longitudinal joints 31 in the second direction joint row R are arranged intermittently in the second direction Y so as to have these 2 intervals alternately in the second direction Y.

The longitudinal joint portions 31 constituting each second direction joint portion row R are aligned in length and arrangement position in the first direction X, and a gap having a constant width W is formed between the second direction joint portion rows R adjacent to each other in the first direction X. Further, a plurality of second-direction joint rows R are formed in the first direction X in a row, the arrangement positions of the longitudinal joints 31 in the second direction Y are the same, and the arrangement positions of the longitudinal joints 31 in the second direction Y of adjacent second-direction joint rows R are different from each other. Specifically, as shown in fig. 27, as the second-direction joint row R, the second-direction first joint row R1 and the second-direction second joint row R2 in which the arrangement positions of the longitudinal joints 31 in the second direction are different from each other are alternately formed in the first direction X, and with respect to the arrangement position of the longitudinal joints 31 in the second direction Y, the second-direction first joint row R1 and the second-direction second joint row R2, a pair of longitudinal joints 31 adjacent to each other at the first interval L2 in any one joint row R1(R2) is located between longitudinal joints 31 adjacent to each other at the second interval L4 in the other joint row R2 (R1).

Then, as shown in fig. 27, a convex portion 41 is formed in a region surrounded by 6 joint portions 31 in total including 2 longitudinal joint portions 31, 31 adjacent to each other in the second direction joint portion row R. The total of 6 joint portions 31 in the side region S of the composite sheet 10A are longitudinal joint portions 31, and specifically, as shown in fig. 27, the total of 6 longitudinal joint portions 31 are surrounded by 2 longitudinal joint portions 31 constituting the second direction first joint row R1 and 4 longitudinal joint portions 31 constituting 2 second direction second joint rows R2 and R2 adjacent to the second direction first joint row R1 in the first direction X. In the side region S of the composite sheet 10A, in each second direction joint row R, the pair of longitudinal joints 30 including the pair of longitudinal joints 31 arranged close to each other at the first interval L2 in the second direction Y is intermittently arranged at the interval L4, which is 2 times or more the first interval L2 in the second direction Y, and the convex portion 41 is formed between the pair of longitudinal joints 30 and 30 adjacent to each other in the second direction Y. The pair of longitudinal joint portions 30 in the present embodiment is constituted by a pair of longitudinal joint portions 31 adjacent to each other at the narrowest spacing L2 in the second direction joint portion row R.

As shown in fig. 25 and 26, in the side region S of the composite sheet 10A, the projections 41 are formed in a dispersed state in the in-plane direction of the composite sheet 10A. The projections 41 are arranged in a staggered manner. More specifically, as shown in fig. 26, the projections 41 are arranged so as to include a first direction projection row 4X, a second direction projection row 4Y, and a third direction projection row 4XY, wherein the first direction projection row 4X is formed by arranging the plurality of projections 41 at regular intervals along the first direction X, the second direction projection row 4Y is formed by arranging the plurality of projections 41 at regular intervals along the second direction Y, and the third direction projection row 4XY is formed by arranging the plurality of projections 41 at regular intervals along a third direction inclined with respect to both the first direction X and the second direction Y. Further, the arrangement positions of the convex portions 41 in the second-direction convex portion rows 4Y adjacent to each other in the first direction X are shifted by half a pitch in the second direction Y, and the arrangement positions of the convex portions 41 in the first-direction convex portion rows 4X adjacent to each other in the second direction Y are shifted by half a pitch in the first direction X. The half pitch is a center-to-center distance between adjacent projections 41 in each of the first direction X and the second direction Y.

As shown in fig. 26, 28(a) and 28(b), each convex portion 41 formed in the side region S of the composite sheet 10A is circular or elliptical in plan view and has a hollow portion 41V on the back surface side. The protrusion 41 has a top at the center of the region surrounded by the 6 longitudinal joint portions 31.

In addition, in the side region S of the composite sheet 10A, as shown in fig. 27, the second protrusions 42 having a height lower than the protrusions 41 are formed between the vertically long joining portions 31, 31 adjacent to each other at the narrow interval L2 in the second direction protrusion row R, and the third protrusions 43 having a height lower than the protrusions 41 are formed between the nearest joining portions 31 in the second direction protrusion row R adjacent to each other in the first direction X. The convex portion 41 and the other adjacent convex portion 41 are separated by an annular concave portion composed of 6 joint portions surrounding the convex portion 41 and a second convex portion 42 and a convex portion 43 located between these joint portions. Although the second convex portion 42 and the third convex portion 43 are "convex" in the text, the second convex portion 42 and the third convex portion 43 are relatively lower in height than the convex portion 41, and thus are opposed concave portions when viewed from the convex portion 41.

Fig. 29 is a view corresponding to fig. 23 of side region forming portions of the first roller and the second roller for manufacturing the composite sheet 10A. In the side region forming portions of the first and second rolls for manufacturing the composite sheet 10A, the first roll concave region 141A is formed by the second roll convex portion 141B, and the first sheet 1 (not shown) is press-fitted into the first roll 111, so that the three-dimensional shape corresponding to the convex portion 41 can be formed. On the other hand, in the first roller second concave region 142A and the first roller third concave region 143A, the first sheet 1 (not shown) is sucked into the second concave region 142A and the third concave region 143A by the suction from the second concave region 142A and the third concave region 143A into the first roller 111, and the three-dimensional shape corresponding to the second convex portion 42 and the third convex portion 43 can be formed. Then, the second sheet 2 is bonded to the first sheet 1 after the three-dimensional shaping, whereby the intended composite sheet 10A can be obtained.

In the composite sheet 10A, too, the area ratio of the joint 31 in the side region S is made higher than the area ratio of the joint 3 in the central region M by forming the joints in different patterns in the central region M and the pair of side regions S, S.

Therefore, the same effects as those of the diaper 100 of the first embodiment can be obtained with the diaper of the second embodiment in which the composite sheet 10A is used as the topsheet.

In the composite sheet 10A, preferable ranges thereof are the same as those of the composite sheet 10 of the first embodiment with respect to a difference (Es-Em, percentage) between an area ratio Es (%) of the joint in the side region S and an area ratio Em (%) of the joint in the central region M, an area ratio Em of the joint in the central region M, an area ratio Es of the joint in the side region S, bending rigidities of the side region S and the central region M, a ratio of a length in the first direction X of the joint 31 of the side region S as the lengthwise joint and the joint 3 in the central region M, and the like.

Next, a disposable diaper according to a third embodiment will be described. In the composite sheet 10B constituting the topsheet in the disposable diaper according to the third embodiment, as shown in fig. 30, the shape and arrangement pattern of the projections in the central region M are different from those in the side regions S, S.

The third embodiment is mainly explained about differences from the first embodiment described above, and explanations of the same points are omitted. The description of the first embodiment can be applied as appropriate to points not specifically described.

As shown in fig. 31, in the central region M of the composite sheet 10B, the first sheet 1 and the second sheet 2 which are laminated are partially joined to form a plurality of joined portions 34, and the first sheet 1 projects in a direction away from the second sheet 2 at a portion other than the joined portions 34 to form a plurality of projections 40C which project toward the skin of the wearer, similarly to the central region M of the composite sheet 10 described above. In the central region M of the composite sheet 10B, the joints 34 are formed in a lattice-like arrangement pattern including a first joint row formed of a plurality of lattices in which the joints 34 are arranged in a row at a constant pitch in the first direction X and a second joint row formed of a plurality of lattices in which the joints 34 are arranged in a row at a constant pitch in the second direction Y, and convex portions 40C having a substantially cross-like shape in plan view are formed in portions corresponding to meshes of the lattices surrounded by 8 joints 34. The convex portion 40C is composed of a high convex portion 41 'having a hollow portion on the back surface side and forming the top of the convex portion 40C, and 4 low convex portions 42' formed around the high convex portion 41 'in a state of being connected to the high convex portion 41', similarly to the convex portion 40 of the composite sheet 10 described above. For example, in the case where the composite sheet 10B shown in fig. 30 is used as the topsheet of the disposable diaper 100 so that the first direction X coincides with the article longitudinal direction Xa, the 4 low protrusions 42 'around the high protrusions 41' extend in directions inclined with respect to each of the article longitudinal direction Xa and the article width direction Ya.

As shown in fig. 32, in the side region S of the composite sheet 10B, as a joint formed by partially joining the first sheet 1 and the second sheet 2 stacked, a first joint 31 having a vertically long rectangular shape and being long in the first direction X, and a second joint 32 having a square shape and being the same in length as the first joint 31 but shorter in length in the first direction X than the first joint are formed. In the side region S of the composite sheet 10B, a plurality of central continuous protrusions 40 continuously extending in the second direction Y are formed at a constant distance in the first direction X as protrusions formed by the first sheet 1 protruding in a direction away from the second sheet 2. The central continuous convex portions 40 are formed by connecting first convex portions 41 and second convex portions 42 alternately arranged in the second direction Y to each other, respectively. The first convex portion 41 and the second convex portion 42 constituting the central continuous convex portion 40 have hollow portions on the respective back surfaces thereof, the hollow portion of the back surface of the first convex portion 41 is continuous with the hollow portion of the back surface of the second convex portion 42, and a continuous hollow portion continuously extending in the second direction Y is formed on the back surface side of the central continuous convex portion 40. In the side region S of the composite sheet 10B, non-embossed regions N extending in the second direction Y and continuing in the second direction without joint portions and embossed regions E extending in the second direction and having joint portions formed in a regular pattern are alternately formed in the first direction X. In the embossed region E, the embossed region inner protrusions 46' are formed in a state of being surrounded by 2 first joint portions 31 and 4 second joint portions 32.

In the composite sheet 10B, too, the joint portions are formed in different patterns in the central region M and the pair of side regions S, S so that the area ratio of the joint portions 31, 32 in the side region S is higher than the area ratio of the joint portion 34 in the central region M.

Therefore, the same effects as those of the diaper 100 of the first embodiment can be obtained by the diaper of the third embodiment using the composite sheet 10B as the topsheet.

In the composite sheet 10B and the composite sheet 10C described later, preferable ranges thereof are the same as those of the composite sheet 10 of the first embodiment, with respect to a difference (Es-Em, percentage) between an area ratio Es (%) of the joint in the side region S and an area ratio Em (%) of the joint in the central region M, an area ratio Em of the joint in the central region M, an area ratio Es of the joint in the side region S, bending rigidities of the side region S and the central region M, a ratio of a length in the first direction X of the joint 31 in the side region S as the longitudinal joint and the joint 3 in the central region M, and the like.

Next, a disposable diaper according to a fourth embodiment will be described. In the composite sheet 10C constituting the topsheet in the disposable diaper according to the fourth embodiment, as shown in fig. 33, the shape and arrangement pattern of the projections in the central region M are also different from those in the side regions S, S.

The fourth embodiment is mainly explained about differences from the first embodiment, and explanation about the same points will be omitted. The description of the first embodiment can be applied as appropriate to the points not specifically described.

Fig. 34 is an enlarged plan view of the composite sheet 10C shown in fig. 33 in the vicinity of the boundary between the central region M and the side region S. Fig. 35(a) to 35(C) show a Va-Va line cross-sectional view, a Vb-Vb line cross-sectional view, and a Vc-Vc line cross-sectional view of fig. 34 as cross-sectional views of the composite sheet 10C in the central region M.

As shown in fig. 33 to 35, a plurality of joining portions 331, 332 formed by partially joining the first sheet 1 and the second sheet 2 stacked together are formed in the central region M of the composite sheet 10C. The first sheet 1 projects in a direction away from the second sheet 2 at a portion other than the joint portions, and thereby the central continuous projection 40M, the third projection 343, and the fourth projection 344 are formed as projections projecting toward the skin of the wearer.

The central continuous protrusions 40M extend in the second direction Y, and are formed in plurality at intervals in the first direction X. The third protrusions 343 are formed in scattered dots at intervals in the first direction X and the second direction Y. The fourth protrusion 344 is formed between the central continuous protrusion 40M and the third protrusion 343.

As shown in fig. 34 and 35(a), each of the central continuous protrusions 40M is formed by connecting first protrusions 341 and second protrusions 342 alternately arranged in the second direction Y to each other. The first convex portion 341 and the second convex portion 342 constituting the central continuous convex portion 40M have hollow portions on the back surfaces thereof. Preferably, the central continuous convex portion 40M has a hollow portion on the back surface of the first convex portion 341 continuous with a hollow portion on the back surface of the second convex portion 342, and a continuous hollow portion 40V continuously extending in the second direction Y is formed on the back surface side of the central continuous convex portion 40M. The third projection 343 also preferably has a hollow 43V formed in the rear surface thereof.

The first convex portions 341 and the second convex portions 342 constituting the central continuous convex portion 40M are each elliptical in plan view, but the major axis of the ellipse of the first convex portion 341 coincides with the first direction X, and the major axis of the ellipse of the second convex portion 342 coincides with the second direction Y. In addition, the first, second, and third protrusions 341, 342, and 343 each preferably have a shape having a top in a cross section along the first direction X, and more preferably have a top in any cross section in the first direction X and the second direction Y. The upper surface of the fourth projection 344 is substantially flat, but protrudes from the upper surface of each of the 2 second joint portions 332 sandwiching the fourth projection 344.

In the central region M of the composite sheet 10C, first joining portions 331 arranged at predetermined intervals, preferably at constant intervals, in the first direction X, and second joining portions 332 arranged at intervals narrower than the first joining portions 331 in the first direction X are formed. The first joint portions 331 and the second joint portions 332 are formed in a plurality of rows in the second direction Y, and as shown in fig. 34, in the central region M of the composite sheet 10C, a longitudinal first joint portion row R3X in which the first joint portions 331 are arranged in the first direction X and a lateral first joint portion row R3Y in which the first joint portions 331 are arranged in the second direction Y are formed in a plurality of rows, respectively, and a longitudinal second joint portion row R4X in which the second joint portions 332 are arranged in the first direction X and a lateral second joint portion row R4Y in which the second joint portions 332 are arranged in the second direction Y are formed in a plurality of rows, respectively.

In the central region M of the composite sheet 10C, embossed regions E and non-embossed regions N are alternately formed in the first direction X. The embossed area E is interposed between 2 adjacent rows of transverse second joint rows R4y by transverse first joint rows R3 y. The non-embossed region N is a region between the adjacent transverse second joint rows R4y, and is a region excluding the joints 331, 332. Each of the central continuous protrusions 40M is formed such that a first-direction central portion extending in the second direction Y is located at a first-direction central portion of the non-embossed region N. In the first joining portion 331 and the second joining portion 332, the first sheet 1 and the second sheet 2 are integrally pressed by embossing, the density of both sheets is higher than that of any other portion, and it is preferable that the heat fusion between the two sheets is performed by melting and then solidifying the constituent resin of one or both sheets.

The central continuous protrusion 40M is a portion that extends continuously in the second direction Y and has a width that narrows regularly in the second direction Y. Specifically, as shown in fig. 34, the first convex portion 341 of the central continuous convex portion 40M is formed between a pair of first joining portions 331 opposed to each other with the non-embossed region N interposed therebetween, the second convex portion 342 of the central continuous convex portion 40M is formed in a region surrounded by four total second joining portions 332 constituted by two pairs of second joining portions 332 opposed to each other with the non-embossed region N interposed therebetween, and the length L42 of the second convex portion 342 is shorter than the length L41 of the first convex portion 341 with respect to the length in the first direction X. The portion of the central continuous protrusion 40M formed by the second protrusion 342 is narrower in width (length in the first direction X) than the portion formed by the first protrusion 341.

In the central region M of the composite sheet 10C shown in fig. 34, there are 2 longitudinal second joint rows R4x between the longitudinal first joint rows R3x adjacent in the second direction Y and each other, but the longitudinal first joint rows R3x may be alternately arranged with the longitudinal second joint rows R4x in the second direction Y. In addition, the length of the first engaging portion 331 in the first direction X is preferably the same as or longer than the length of the second engaging portion 332 in the first direction X, and the length of the first engaging portion 331 in the second direction Y is preferably the same as or longer than the length of the second engaging portion 332 in the second direction Y.

As shown in fig. 33, 34, and 36, a plurality of joining portions 231 and 232 are formed in the side region S of the composite sheet 10C, in which the first sheet 1 and the second sheet 2 are partially joined to each other in a stacked manner. The first sheet 1 projects in a direction away from the second sheet 2 at a portion other than these joined portions, and thereby the side continuous convex portion 40S, the third convex portion 243, the fourth convex portion 244, and the fifth convex portion 245 are formed as convex portions projecting toward the skin of the wearer. The side continuous protrusions 40S each extend in the second direction Y, and are formed in plurality at intervals in the first direction X. The third convex portions 243 are formed in a scattered manner at intervals in the first direction X and the second direction Y. The fourth convex portion 244 is formed between the side continuous convex portion 40S and the third convex portion 243, and the fifth convex portion 245 is formed between the first engaging portions 231 adjacent in the second direction Y.

As shown in fig. 34 and 36(a), each side continuous convex portion 40S is formed by connecting first convex portions 241 and second convex portions 242 alternately arranged in the second direction Y to each other. The first convex portion 241 and the second convex portion 242 constituting the side continuous convex portion 40S have hollow portions on the back surfaces thereof. Preferably, the side continuous convex portion 40S has a hollow portion on the back surface of the first convex portion 241 continuous with a hollow portion on the back surface of the second convex portion 242, and a continuous hollow portion 40V continuously extending in the second direction Y is formed on the back surface side of the side continuous convex portion 40S. The third projecting portion 243 preferably has a hollow portion 43V formed on the back surface side thereof.

The first convex portion 241 and the second convex portion 242 constituting the side continuous convex portion 40S are each elliptical in plan view, and the major axis of the ellipse of each of the first convex portion 241 and the second convex portion 242 coincides with the first direction X. The first to third convex portions 241 to 243 of the side continuous convex portion 40S may have a circular shape in plan view. Each of the first, second, and third convex portions 241, 242, and 243 preferably has a shape having a top in a cross section along the first direction X, and more preferably has a top in any cross section in the first direction X and the second direction Y. The upper surface of the fourth convex portion 244 protrudes beyond the upper surfaces of the 2 second joint portions 232 sandwiching the fourth convex portion 244, and the upper surface of the fifth convex portion 245 protrudes beyond the upper surfaces of the 2 first joint portions 231 sandwiching the fifth convex portion 245.

The side region S of the composite sheet 10C is also formed with first joint portions 231 arranged at a predetermined interval, preferably a constant interval, in the first direction X, and second joint portions 232 arranged at intervals narrower than the interval of the first joint portions 231 in the first direction X. As shown in fig. 34, in the side region S of the composite sheet 10C, a first joint row R5X in the vertical direction in which the first joints 231 are arranged in the first direction X and a first joint row R5Y in the horizontal direction in which the first joints 231 are arranged in the second direction Y are formed in a plurality of rows, and a second joint row R6X in the vertical direction in which the second joints 232 are arranged in the first direction X and a second joint row R6Y in the horizontal direction in which the second joints 232 are arranged in the second direction Y are formed in a plurality of rows.

In the side region S of the composite sheet 10C, the side embossed regions SE and the side non-embossed regions SN are also alternately formed in the first direction X. Wherein a transverse first joint row R5y is interposed between adjacent 2 rows of transverse second joint rows R6y in the side embossed area SE. The side non-embossed region SN is a region between the adjacent lateral second joint rows R6y, and is a region excluding the joints 231, 232. Each side continuous protrusion 40S is formed such that a first-direction central portion extending in the second direction Y is located at a first-direction central portion of the side non-embossed region SN. In the first joining part 231 and the second joining part 232, the first sheet 1 and the second sheet 2 are integrally pressed by embossing, the density of both sheets is higher than that of any other part, and it is preferable that the heat fusion between the two sheets is performed by melting and then solidifying the constituent resin of one or both sheets.

As with the central continuous protrusion 40M, the side continuous protrusion 40S also forms a portion that extends continuously in the second direction Y and that narrows regularly in width in the second direction Y, as shown in fig. 34. It is preferable that the length of the first engaging portion 231 in the first direction X is the same as or longer than the length of the second engaging portion 232 in the first direction X, and it is preferable that the length of the first engaging portion 231 in the second direction Y is the same as or longer than the length of the second engaging portion 232 in the second direction Y.

In the central region M of the composite sheet 10C, the height of the fourth protrusions 344 is lower than the height of any of the first protrusions 341, the second protrusions 342, and the third protrusions 343.

When the height of the first protrusion 341 is H1, the height of the second protrusion 342 is H2, the height of the third protrusion 343 is H3, and the height of the fourth protrusion 344 is H4, these heights satisfy the following relationships (1) to (3).

(1)H1≥H3

(2)H3≥H2

(3)H2＞H4

In the side region S of the composite sheet 10C, the heights of the fourth protrusions 244 and the fifth protrusions 245 are lower than the heights of any of the first protrusions 241, the second protrusions 242, and the third protrusions 243. The heights of the first convex portion 241, the second convex portion 242, the third convex portion 243, the fourth convex portion 244, and the fifth convex portion 245 satisfy the following relationships (1) to (3), where H1 is the height of the first convex portion 241, H2 is the height of the second convex portion 242, H3 is the height of the third convex portion 243, H4 is the height of the fourth convex portion 244, and H5 is the height of the fifth convex portion 245.

(1)H1≥H3

(2)H3≥H2

(3) H2 > H4 and H2 > H5

In the composite sheet 10C, too, by forming the joints in different patterns in the central region M and the pair of side regions S, S, the area ratio of the joints 231, 232 in the side region S is made higher than the area ratio of the joints 331, 332 in the central region M.

Therefore, with the diaper of the fourth embodiment using the composite sheet 10C as the topsheet, the same effects as with the diaper 100 of the first embodiment can be obtained.

In addition, in the composite sheet 10C, as shown in fig. 33 and 34, the first convex portions 341, which are the convex portions having the greatest height in the central region M, and the first convex portions 241, which are the convex portions having the greatest height in the side regions S, are formed intermittently in the first direction X along the article longitudinal direction of the composite sheet 10C, and the first convex portions 341 and the first convex portions 241 are formed at different positions from each other in the first direction X.

More specifically, in the composite sheet 10C, the pitch of the first convex portions 341 of the central region M in the first direction X (the same as the distance between the center lines Cm, see fig. 33) is the same as the pitch of the first convex portions 241 of the side regions S in the first direction X (the same as the distance between the center lines Cs, see fig. 33), and the first convex portions 341 of the central region M and the first convex portions 241 of the side regions S are alternately formed in the first direction X. Therefore, the positions of the first convex portions 341 of all the central regions M in the first direction X are different from the positions of the first convex portions 241 of the side regions S in the first direction X. It is preferable that the convex portions (first convex portions 341) having the highest height in the central region M and the convex portions (first convex portions 241) having the highest height in the side regions S are formed at a constant pitch (inter-center distance) in the first direction X, respectively.

In the central region M and the side regions S, since the positions of the protrusions having the largest height are different, the protrusions having the largest height do not overlap with each other, and therefore, the absorbent article including the composite sheet 10C is likely to be bent in the vicinity of the boundary portion of the pattern formed by the protrusions of the central region M and the side regions S in the composite sheet 10C. This makes it easier to smoothly deform the absorbent article into a boat shape, and improves the leakage prevention performance.

From the viewpoint of more reliably obtaining such effects, it is preferable that the highest-level convex portions in the central region M and the highest-level convex portions in the side regions S are alternately arranged 1 by 1 in the first direction X, but the highest-level convex portions may be formed in both regions M, S in a pattern in which 2 or more highest-level convex portions adjacent in the first direction in the side regions S are inserted between 2 or more highest-level convex portions adjacent in the first direction in the central region M, or in a pattern in which 2 or more highest-level convex portions adjacent in the first direction in the central region M are inserted between 2 or more highest-level convex portions adjacent in the first direction in the side regions S. Further, the deformation may be performed such that the position in the first direction X of the convex portion having the largest height in the crotch portion C is different between the central region M and the side region S, and the position in the first direction X of the convex portion having the largest height in either or both of the front and back portions a and B is matched between the central region M and the side region S.

In the composite sheet 10B of the third embodiment, the positions of the convex portions having the largest height are also different between the central region M and the side regions S.

In the composite sheet 10C, in the central region M, the central continuous protrusions 40M extend in the second direction Y and are formed in a plurality of rows in the first direction X; in the side region S, the side continuous protrusions 40S extend in the second direction Y and are formed in a plurality of rows in the first direction X, and the central continuous protrusion 40M and the side continuous protrusions 40S are alternately arranged in the first direction X.

Thus, the central continuous protrusions 40M of the central region M and the side continuous protrusions 40S of the side regions S do not overlap with each other, and therefore, the absorbent article including the composite sheet 10C is bent in the vicinity of the boundary portion where the central region M and the protrusions of the side regions S of the composite sheet 10C form a pattern, and the side portions of the absorbent body and the like are easily raised. This enables a more stable boat shape to be formed, and leakage prevention performance during wearing can be further improved.

As shown in fig. 33, the composite sheet 10C has a boundary region K in which both the central continuous convex portions 40M of the central region M and the side continuous convex portions 40S of the side region S are present at the boundary between the central region M and the side region S, and the central continuous convex portions 40M and the side continuous convex portions 40S are alternately arranged in the first direction X in the boundary region K. More specifically, in the boundary region K, the side continuous protrusions 40S enter between the center continuous protrusions 40M adjacent in the first direction X, and the center continuous protrusions 40M enter between the side continuous protrusions 40S adjacent in the first direction X. When one end of the central continuous protrusion 40M in the second direction Y and one end of the side continuous protrusion 40S in the second direction Y, which are present in the first direction X of the boundary region K, are connected to each other, a zigzag (zigzag) shape is formed.

Since the boundary region K in which the central continuous convex portion 40M and the side continuous convex portions 40S overlap and extend in the second direction Y is provided at the boundary between the central region M and the side regions S, the composite sheet 10C can be easily bent in the boundary region K, and the convex shape can be maintained even in the boundary region K, so that the liquid can be prevented from spreading along the folding line, and the leakage prevention performance during wearing can be further improved.

The composite sheet 10C can be produced in the same manner as the above-described method for producing the composite sheet 10, except that the first roll and the second roll having the tooth crest combination shown in fig. 37 are used. In fig. 37, the tooth crest indicated by the fine dots is a predetermined position for forming the joint portion in the central region or the side region of the intended composite sheet 10C.

As a disposable diaper according to an embodiment of the present invention, it is preferable that the elastic member disposition region BM in which the plurality of elastic members 19 are disposed is provided in at least the widthwise central portion of the back portion B as in a disposable diaper 100A shown in fig. 38.

The fastening tape 17 in the disposable diaper 100A shown in fig. 38 is composed of a tape base material 17a and a male surface member of a mechanical surface fastener joined to the tape base material 17a to form a fastening portion 17c, and the fastening region 18 is formed by joining the male surface member of the mechanical surface fastener or a highly bondable nonwoven fabric to the back sheet 13. A part of the tape base material 17a of the fastening tape 17 forms a fixing portion 17b that is fixed in a state of being sandwiched between the back sheet 13 and the sheet 15 for forming three-dimensional wrinkles. Between the left and right fastener tapes 17, a plurality of linear or belt-like elastic members 19 for contracting the diaper 100A in the width direction Ya are provided at intervals in the longitudinal direction Xa of the diaper 100A. The plurality of elastic members 19 are disposed as elastic sheets 19s fixed between 2 pieces of nonwoven fabric or two-folded nonwoven fabric, and preferably, the end portions of the elastic sheets 19s or the end portions of the elastic members 19 included in the elastic sheets 19s overlap the fixing portions 17 b. The elastic members 19 are preferably arranged at a constant interval in the article longitudinal direction Xa. The fastening portion 17c of the fastening tape 17 may be an adhesive portion formed by applying an adhesive to the tape base material 17 a. As the tape base material 17a, various known materials such as nonwoven fabric can be used.

The topsheet 12 of the disposable diaper 100A shown in fig. 38 is composed of a composite sheet 10X, and as with the composite sheet 10C described above, the composite sheet 10X has a plurality of central continuous protrusions 40M extending in the second direction Y and spaced apart in the first direction X in the central region M of the composite sheet.

In the composite sheet 10X, it is preferable that a plurality of the central continuous protrusions 40M continuously extending in the second direction Y are formed in the elastic member disposition region BM so as to extend in the second direction Y, and as shown in fig. 39, it is more preferable that a relationship of P1 < P2 < P3 is satisfied when the width of the central continuous protrusion 40M is P1, the interval of the elastic member 19 is P2, and the interval between the central portions of the central continuous protrusions 40M is P3. The width P1 of the central continuous convex portion 40M is a width along the first direction X, and as shown in fig. 39, when the joint portion 332 having a relatively narrow interval between the pair of joint portions and the joint portion 331 having a relatively wide interval between the pair of joint portions are provided as the pair of joint portions opposing each other across the central continuous convex portion 40M, the distance between the joint portions 332 having the narrowest interval between the pair of joint portions is defined as the width P1 of the central continuous convex portion 40M. Further, the elastic member disposition region BM is preferably wider in the width direction than the central region M of the composite sheet. Fig. 39 shows a case where the composite sheet constituting the front sheet 12 is the composite sheet 10C, but the same applies to a case where a composite sheet having another configuration in which the central region M has a central continuous projection is used for the front sheet 12.

The plurality of elastic members 19 contract the diaper in the width direction to improve the fit of the back side portion B, but when the central continuous convex portion 40M of the composite sheet 10X constituting the topsheet 12 and the elastic members 19 arranged to overlap with the elastic member arrangement region BM in which the plurality of elastic members 19 are arranged satisfy the above-described relationship, the shape of the central continuous convex portion 40M is easily maintained by the elastic members 19 even in a state where the back side portion B of the diaper 100, particularly the portion extending toward the back side end side with respect to the absorbent body 14, contracts in the second direction Y along the article width direction Ya. This improves the effect of preventing stuffiness of the back portion B, and also improves the effect of preventing liquid leakage from the back portion B.

Further, since the central continuous convex portion 40M has a portion whose width is regularly narrowed in the second direction Y, contraction of the central continuous convex portion 40M becomes regular, and the effect of preventing stuffiness of the back portion B is improved. Further, a coarse density gradient of the fiber density can be formed in the central continuous protrusion 40M, and the liquid absorption performance and the leakage prevention effect are also improved.

The present invention has been described above based on preferred embodiments, but the present invention is not limited to the above embodiments. For example, as a topsheet of an absorbent article, the central region M of 1 of the composite sheets 10 and 10A to 10C may be configured as the central region M of the other sheet, and the side regions S of 1 of the composite sheets 10 and 10A to 10C may be configured as the side regions S of the other sheet. For example, a composite sheet having the same configuration of the central region M as the composite sheet 10 and the same configuration of the side regions S as the composite sheet 10B, a composite sheet having the same configuration of the central region M as the composite sheet 10B and the same configuration of the side regions S as the composite sheet 10 or the composite sheet 10A, or the like may be used.

As the elastic member for contracting the absorbent article in the article longitudinal direction, which is the longitudinal direction thereof, only one of the elastic member 15a for forming the three-dimensional gathers and the elastic member 16 for forming the leg gathers may be disposed. The elastic member 15a forming the three-dimensional gathers and the elastic member 16 forming the leg gathers may be disposed one by one on each of the left and right sides of the absorbent article, or may be disposed in plural. Further, the elastic member that contracts the absorbent article in the article longitudinal direction, which is the longitudinal direction of the absorbent article, may not be provided.

The absorbent article of the present invention may be a pants-type disposable diaper, a sanitary napkin, an incontinence pad, a panty liner, or the like, in addition to an unfolded-type disposable diaper.

The present invention also discloses the following absorbent article according to the above embodiment.

< 1 > an absorbent article comprising a front sheet and a back sheet each comprising a composite sheet and an absorbent body disposed between the sheets,

the composite sheet has a first direction along the longitudinal direction of the article and a second direction along the width direction of the article, and the laminated first sheet and second sheet are partially joined to form a plurality of joined portions, the first sheet protrudes in a direction away from the second sheet at a portion other than the joined portions, and forms a convex portion protruding toward the skin of the wearer,

the composite sheet has a central region in which the projections are formed in different patterns from each other and a pair of side regions located on both sides of the central region,

the area ratio of the joining portion in each side region is higher than the area ratio of the joining portion in the central region,

< 2 > the absorbent article as described in the above < 1 >, wherein the difference (Es-Em, percentage point) between the area ratio Es (%) of the joined portions in the side regions and the area ratio Em (%) of the joined portions in the central region is preferably 5% or more, more preferably 10% or more.

< 3 > the absorbent article as stated in the above < 1 > or < 2 >, and the area ratio Es of the joined portions in the side regions is preferably 5% or more, more preferably 10% or more, and further preferably 50% or less, more preferably 30% or less, on the premise that it is larger than the area ratio Em.

< 4 > the absorbent article as defined in any one of the above < 1 > -3 >, wherein the area ratio Em of the joined portions in the central region is preferably 30% or less, more preferably 20% or less, and further preferably 3% or more, more preferably 5% or more, on the premise that it is smaller than the area ratio Es.

< 5 > the absorbent article as defined in any one of above < 1 > -4 >, wherein the height of the protrusions having the largest height in the central region is the same as the height of the protrusions having the largest height in the side regions.

< 6 > the absorbent article as defined in any one of the above < 1 > to < 5 >, wherein all or a part of the joint portions formed in the side regions are longitudinal joint portions having a length in the article longitudinal direction longer than any one of the joint portions formed in the central region.

< 7 > the absorbent article as defined in any one of the above < 1 > to < 6 >, wherein in the joint portions formed in the side regions, the length of the longitudinal joint portion having a length in the first direction X longer than any of the joint portions formed in the central region is preferably 1.2 times or more, more preferably 1.5 times or more, and further preferably 5 times or less, more preferably 3.5 times or less, the length in the first direction of the joint portion 3 having the largest length in the first direction X formed in the central region M.

< 8 > the absorbent article according to any one of the above < 1 > to < 7 >, wherein the convex portions are arranged in a staggered manner in the central region, and the convex portions or annular coupling convex portions formed by annularly coupling the convex portions are arranged in a staggered manner in the side regions.

< 9 > the absorbent article as defined in any of the above < 1 > to < 8 >, wherein the joints in the central region are formed in a lattice-like arrangement pattern, the lattice-like arrangement pattern is composed of a first joint row formed of a plurality of lattices each of which is linearly arranged at intervals by a plurality of joints and a second joint row formed of a plurality of lattices each of which is linearly arranged at intervals by a plurality of joints, and the projections are formed at positions corresponding to meshes of the lattices.

< 10 > the absorbent article as defined in any of the above < 1 > to < 9 >, wherein each of the convex portions formed in the central region is composed of a high convex portion having a hollow portion on the back surface side and forming a top portion of the convex portion, and 4 low convex portions formed around the high convex portion in a state of being connected to the high convex portion.

< 11 > the absorbent article as defined in any of above < 1 > to < 10 >, wherein the absorbent core comprises an absorbent core and a core sheet covering the absorbent core, the absorbent core has notch portions or through portions which are recessed in a plan view and on both sides of a crotch portion of the absorbent article, respectively, and a forming material of the absorbent core is not disposed, and the side regions of the composite sheet overlap with all or part of the notch portions or through portions which are recessed.

< 12 > the absorbent article according to any one of the above < 1 > to < 11 >, wherein a sheet for forming three-dimensional gathers having the elastic member fixed to an inner edge portion thereof is disposed on both side portions in a longitudinal direction of the absorbent article, and the inner edge portion of the sheet is fixed to the side portion region.

< 13 > the absorbent article as defined in any of the above < 1 > -12 >, wherein a central region having convex portions different from each other and side regions on both sides thereof are formed at least in a crotch portion in the article longitudinal direction.

< 14 > the absorbent article as defined in any of above < 1 > -13 >, wherein the central region having the convex portions different from each other and the side regions on both sides thereof extend over the entire length of the absorbent body in the article longitudinal direction.

< 15 > the absorbent article as defined in any one of the above < 1 > to < 14 >, wherein the second sheet side surface is substantially flat in both the central region and the side region.

< 16 > the absorbent article as defined in any one of above < 1 > to < 15 >, the first sheet and the second sheet being nonwoven fabrics.

< 17 > the absorbent article as stated above < 16 >, the grammage of the above nonwoven fabric is preferably 10g/m²More preferably 15g/m or more²Above, it is preferably 40g/m²Less than, more preferably 35g/m²The following.

< 18 > the absorbent article as defined in any one of the above < 1 > to < 17 >, wherein the first sheet and the second sheet are integrally pressed at a joint formed by joining the stacked first sheet and second sheet portions, and the density of both sheets is higher than that of any other portion.

< 19 > the absorbent article as defined in any one of the above < 1 > to < 18 >, wherein the meshes of the lattice having the projections are surrounded by 8 joints 3, respectively.

< 20 > the absorbent article as defined in any one of the above < 1 > -19 >, wherein an angle θ (see fig. 7) formed by the lattice-forming first bond row LR1 and the lattice-forming second bond row LR2 is preferably 30 ° to 165 °, more preferably 45 ° to 150 °, further preferably more than 90 ° and 120 ° inclusive.

< 21 > the absorbent article as defined in any of the above < 1 > to < 20 >, which is surrounded by a total of 8 joint portions including 2 adjacent first joint portions 31 in the first joint portion row R1, a total of 4 second joint portions 32 of the 2 second joint portion rows R2 located on both sides of the first joint portion row R1, and 2 third joint portions 33 of the 2 third joint portion rows R3 located further outside.

< 22 > the absorbent article as defined in any of the above < 1 > to < 21 >, wherein the convex portion formed in the central region has a high convex portion and a plurality of low convex portions joined around the high convex portion, the high convex portion of the convex portion is surrounded by 4 second joint portions in a plan view of the composite sheet and has a circular or elliptical shape, and a top portion of the convex portion is formed in a central portion of a region surrounded by the 4 second joint portions.

< 23 > the absorbent article as defined in any one of the above < 1 > to < 22 >, wherein the convex portions formed in the central region have a tendency that a pair of first low convex portions and a pair of second low convex portions are joined around the high convex portions, the first low convex portions are located between 2 second joint portions facing each other in the first direction X, and the second low convex portions are located between 2 second joint portions facing each other in the second direction Y.

< 24 > the absorbent article as defined in any one of the above < 1 > -23 >, wherein the arrangement and form of the convex portions of the composite sheet are different between the central region and the pair of side regions.

< 25 > the absorbent article as defined in any of the above < 1 > -24 >, wherein a first convex portion, a second convex portion and a third convex portion, which are convex portions of 3 kinds different from each other in height, are formed on a first sheet constituting the composite sheet in a side region of the composite sheet.

< 26 > the absorbent article as defined in any of the above < 1 > -25 >, wherein the side region is formed with a first protrusion, a second protrusion and a third protrusion, and the height of the first protrusion is set to be H₁H is the height of the second convex part₂H is the height of the third convex part₃When, these 3 heights satisfy H₁≥H₂＞H₃The relationship (2) of (c).

< 27 > the absorbent article as stated above < 26 > wherein the height H of the first protrusions₁Height H of the second convex portion₂And height H of third convex part₃Satisfy H₁＞H₂＞H₃The relationship (2) of (c).

< 28 > the absorbent article as defined in any of the above < 25 > to < 27 >, wherein the first protrusions and the second protrusions are both substantially circular in shape in plan view, and the diameter of the circle of the first protrusions is larger than the diameter of the circle of the second protrusions.

< 29 > the absorbent article as defined in any one of the above < 25 > - < 28 >, the first and second protrusions have a shape having a top portion in a cross section in any one of the first direction X and the second direction Y, and the third protrusion 43 has a substantially rectangular shape elongated in the first direction X in a plan view.

< 30 > the absorbent article as defined in any of the above < 1 > -29 >, wherein annular coupling convex portions, which couple 1 or more first convex portions and 1 or more second convex portions, are formed in the side portion region.

< 31 > the absorbent article of < 30 > wherein the annular coupling projection has a pair of first projection groups each comprising 3 first projections arranged in a first direction at positions line-symmetrical with respect to a center line connecting centers of 2 second projections arranged at a distance from each other in the first direction, in a plan view of the composite sheet,

the 3 first protrusions constituting the first protrusion group are connected along the first direction X.

< 32 > the absorbent article as described in < 30 > or < 31 > above, wherein the central protrusion is formed substantially at the center of the loop of the annular connecting protrusion.

< 33 > the absorbent article as defined in any one of above < 29 > -32 >, the side region having a third convex portion,

height H of the central protrusion₄Height H of the second convex part₂Substantially the same height H of the central convex part₄Is higher than the height H of the third convex part₃。

< 34 > the absorbent article as defined in any of the above < 29 > to < 33 >, wherein the second protrusions, the third protrusions, the central protrusions and the third protrusions are arranged regularly and linearly along the first direction X, which is one direction within the plane of the composite sheet, in the order of the second protrusions, the third protrusions, the central protrusions and the third protrusions.

< 35 > the absorbent article as defined in any one of above < 1 > -34 >, wherein the bending rigidity of the side regions of the composite sheet is higher than the bending rigidity of the central region.

< 36 > the absorbent article as stated in the above < 35 >, wherein the ratio of the bending stiffness of the side region to the bending stiffness of the central region is preferably 1.1 or more, more preferably 1.2 or more.

< 37 > the absorbent article as defined in any of the above < 35 > or < 36 >, wherein the bending stiffness of the side regions is preferably 10cN or more, more preferably 15cN or more, and preferably 50cN or less, more preferably 40cN or less, on the premise that the bending stiffness of the central region M is greater.

< 38 > the absorbent article as defined in any of the above < 35 > -37 >, wherein the bending stiffness of the central region M is preferably 40cN or less, more preferably 30cN or less, and further preferably 5cN or more, more preferably 10cN or more, on the premise that it is lower than the bending stiffness of the side regions.

< 39 > the absorbent article as defined in any of the above < 9 > - < 38 >, wherein the arrangement pitch (distance between center points) P1 of the junctions in the junction row in which the first junction row LR1 is formed and the second junction row LR2 is preferably 1.1 times or more, more preferably 1.5 times or more, and further preferably 10 times or less, more preferably 5 times or less the shortest distance LL between adjacent junctions.

< 40 > the absorbent article as defined in any one of above < 1 > to < 39 >, wherein the convex portions formed in the central region have a shape in which the low convex portions extend in four directions from the high convex portions of the central portion.

< 41 > the absorbent article as stated in above < 40 >, said composite sheet having a pair of first low protrusions extending from the high protrusions in one direction of the in-plane direction of the sheet and another pair of second low protrusions extending from the high protrusions in the direction orthogonal to the one direction of the in-plane direction of the sheet, as 4 low protrusions constituting said protrusions, the first low protrusions having a length L4 extending from the high protrusions to the outermost end longer than the length L4 extending from the high protrusions to the outermost end of the second low protrusions.

< 42 > the absorbent article as stated in above < 40 > or < 41 >, wherein the high protrusions have depressions recessed in the interior direction of the protrusions at the boundary with the low protrusions.

< 43 > the absorbent article as defined in any one of the above < 1 > to < 42 >, wherein a plurality of the protrusions having the largest height in the central region and a plurality of the protrusions having the largest height in the side regions are intermittently formed in the first direction of the composite sheet, and the protrusions having the largest height in the central region and the protrusions having the largest height in the side regions are formed at positions different from each other in the first direction.

< 44 > the absorbent article as defined in any one of the above < 1 > -43 >, wherein in the central region M, central continuous protrusions each extend in the second direction Y and are formed in a plurality of rows in the first direction X; in the side region, the side continuous protrusions extend in the second direction Y and are formed in a plurality of rows in the first direction X, and the central continuous protrusion and the side continuous protrusions are alternately arranged in the first direction X.

< 45 > the absorbent article as defined in any one of the above < 1 > -44 >, wherein a boundary region where both the central continuous protrusions and the side continuous protrusions are present is provided at a boundary portion between the central region and the side region, and the central continuous protrusions and the side continuous protrusions are alternately arranged in the first direction X in the boundary region.

< 46 > the absorbent article according to any one of the above < 1 > -45 > comprising an abdomen-side portion disposed on the abdomen-side of a wearer when worn, a back-side portion disposed on the back-side of the wearer when worn, and a crotch portion positioned between the abdomen-side portion and the back-side portion,

a plurality of elastic members for contracting the disposable diaper in the width direction are arranged at least in the width direction center portion of the back portion at intervals in the longitudinal direction of the disposable diaper,

a plurality of central continuous protrusions extending in the second direction and spaced apart from each other in the first direction are formed in the central region of the composite sheet,

a plurality of elastic member disposition regions in which the plurality of elastic members are disposed, the central continuous protrusions extending in the second direction and being formed in plurality,

when the width of the central continuous protrusion is P1, the interval between the elastic members is P2, and the interval between the central portions of the central continuous protrusions is P3, the relationship of P1 < P2 < P3 is satisfied.

Industrial applicability

According to the absorbent article of the present invention, the boundary between the central region and the side region of the topsheet is easily bent, and the absorbent article is easily deformed into a boat shape when worn, and excellent leakage prevention performance can be obtained. In addition, since the height of the convex portion having the largest height is made the same in the central region and the side regions and the formation patterns of the convex portions formed in the central region and the side regions are made different from each other, excellent leakage preventing performance is achieved, and therefore, even when the absorbent article is stored in a state of being packed in a compressed state in the package bag, the leakage preventing performance is less likely to be lowered. The boat-shaped shape is a state in which the cross section of the absorbent article along the longitudinal direction thereof is curved in a concave shape with the skin contact surface side being the inside, and the side regions of the front sheet are bent in the vicinity of the boundary with the central region, and are raised so as to be close to the skin of the wearer.

Claims (44)

1. An absorbent article comprising a front sheet and a back sheet each composed of a composite sheet, and an absorbent body disposed between the sheets, the absorbent article being characterized in that:

the composite sheet has a first direction along the length direction of the article and a second direction along the width direction of the article, and the laminated first sheet and second sheet are partially joined to form a plurality of joined portions, the first sheet protrudes in a direction away from the second sheet at a portion other than the joined portions, and forms a convex portion protruding toward the skin of the wearer,

the composite sheet has a central region in which the projections are formed in different patterns from each other and a pair of side regions located on both sides of the central region,

the area ratio of the joining portion in each side region is higher than the area ratio of the joining portion in the central region,

the height of the convex part with the maximum height of the central area is the same as that of the convex part with the maximum height of each side area,

all or a part of the joining portions formed in the side regions are longitudinal joining portions having a longer length in the article longitudinal direction than any of the joining portions formed in the central region.

2. The absorbent article of claim 1, wherein:

the difference between the area ratio of the joining portion in each side region and the area ratio of the joining portion in the central region is 5 percentage points or more.

3. The absorbent article of claim 1 or 2, wherein:

the area ratio of the joint in each side region is 5% to 50%.

4. The absorbent article of claim 1 or 2, wherein:

the area ratio of the joint in the central region is 3% to 30%.

5. The absorbent article of claim 1 or 2, wherein:

in the joint portions formed in the side regions, the length of the lengthwise joint portion, which is longer in the first direction than any of the joint portions formed in the central region, is 1.2 times or more and 5 times or less the length in the first direction of the joint portion, which is formed in the central region and has the largest length in the first direction.

6. The absorbent article of claim 1 or 2, wherein:

in the central region, the convex portions are arranged in a staggered manner,

in the side region, the convex portions or annular coupling convex portions formed by annularly coupling the convex portions are arranged in a staggered manner.

7. The absorbent article of claim 1 or 2, wherein:

the joints in the central region are formed in a lattice-like arrangement pattern,

the lattice-shaped arrangement pattern is composed of a plurality of lattice-forming first joint rows each formed by linearly arranging a plurality of joints at intervals, and a plurality of lattice-forming second joint rows each formed by linearly arranging a plurality of joints at intervals,

the convex portions are formed in the meshes of the lattice.

8. The absorbent article of claim 1 or 2, wherein:

each of the convex portions formed in the central region is composed of a high convex portion having a hollow portion on the back surface side and forming a top portion of the convex portion, and 4 low convex portions formed around the high convex portion in a state of being connected to the high convex portion.

9. The absorbent article of claim 1 or 2, wherein:

the absorbent body is composed of an absorbent core and a core-spun sheet covering the absorbent core,

the absorbent core has a notch part or a penetration part which is concave in a plane view and is not provided with a forming material of the absorbent core on both sides of the crotch part of the absorbent article,

the side regions of the composite sheet overlap all or part of the recessed cut-out or through-hole.

10. The absorbent article of claim 1 or 2, wherein:

sheets for forming three-dimensional gathers, each having an elastic member fixed to an inner edge portion thereof, are disposed on both longitudinal side portions of the absorbent article, and the inner edge portions of the sheets are fixed to the side regions.

11. The absorbent article of claim 1 or 2, wherein:

the central region having convex portions different from each other and the side regions on both sides thereof are formed at least in the crotch portion in the article longitudinal direction.

12. The absorbent article of claim 1 or 2, wherein:

the central region having projections different from each other and the side regions on both sides thereof extend over the entire length of the absorbent body in the article longitudinal direction.

13. The absorbent article of claim 1 or 2, wherein:

in any of the central region and the side regions, the second sheet side surface is flat.

14. The absorbent article of claim 1 or 2, wherein:

the first sheet and the second sheet are nonwoven fabrics.

15. The absorbent article of claim 14, wherein:

the gram weight of the non-woven fabric is 10g/m²Above 40g/m²The following.

16. The absorbent article of claim 1 or 2, wherein:

in the joined portion formed by joining the first sheet and the second sheet which are stacked together, the first sheet and the second sheet are integrally pressed, and the density of both sheets is higher than that of any other portion.

17. The absorbent article of claim 7, wherein:

the mesh of the lattice in which the projections are formed is surrounded by 8 of the joints.

18. The absorbent article of claim 7, wherein:

an angle formed by the lattice-forming first joint line and the lattice-forming second joint line is 30 ° or more and 165 ° or less.

19. The absorbent article of claim 7, wherein:

the mesh of the lattice in which the projections are formed is surrounded by 8 joints in total including 2 adjacent first joints in the first joint row, 4 second joints in 2 second joint rows located on both sides of the first joint row, and 2 third joints in 2 third joint rows located further outside.

20. The absorbent article of claim 7, wherein:

the convex portion formed in the central region has a high convex portion and a plurality of low convex portions joined therearound,

the high convex portion of the convex portion is surrounded by 4 second joint portions of the 2 second joint portion rows in a plan view of the composite sheet, and has a circular or elliptical shape, and the top portion of the convex portion is formed at the central portion of the region surrounded by the 4 second joint portions.

21. The absorbent article of claim 1 or 2, wherein:

the convex portions formed in the central region have a tendency that a pair of first low convex portions and a pair of second low convex portions are joined around a high convex portion,

the first low protrusion is located between 2 second engaging portions opposing in the first direction, and the second low protrusion is located between 2 second engaging portions opposing in the second direction.

22. The absorbent article of claim 1 or 2, wherein:

the arrangement and form of the projections of the composite sheet are different in the center region and the pair of side regions.

23. The absorbent article of claim 1, wherein:

in the side region of the composite sheet, the first sheet constituting the composite sheet is formed with first, second, and third convex portions as 3 kinds of convex portions different in height from each other.

24. The absorbent article of claim 1, wherein:

the side region is formed with a first projection, a second projection and a third projection,

the height of the first convex part is set as H₁H is the height of the second convex part₂H is the height of the third convex part₃When, these 3 heights satisfy H₁≥H₂＞H₃The relationship (2) of (c).

25. The absorbent article of claim 24, wherein:

height H of the first convex part₁Height H of the second convex portion₂And the height H of the third convex part₃Satisfy H₁＞H₂＞H₃The relationship (2) of (c).

26. The absorbent article according to any one of claims 23 to 25, wherein:

the first convex portion and the second convex portion are both circular in shape in plan view,

the diameter of the circle of the first convex part is larger than that of the circle of the second convex part.

27. The absorbent article according to any one of claims 23 to 25, wherein:

the first convex portion and the second convex portion have a shape having a top portion in a cross section in any one of the first direction and the second direction, and the third convex portion has a rectangular shape elongated in the first direction in a plan view.

28. The absorbent article according to any one of claims 23 to 25, wherein:

an annular coupling convex portion formed by coupling 1 or more first convex portions and 1 or more second convex portions is formed in the side portion region.

29. The absorbent article of claim 28, wherein:

the annular connecting projection has a pair of first projection groups each including 3 first projections arranged in a first direction at positions line-symmetrical with respect to a center line connecting centers of 2 second projections arranged at a distance from each other in the first direction, in a plan view of the composite sheet,

the 3 first protrusions constituting the first protrusion group are connected along a first direction.

30. The absorbent article of claim 28, wherein:

a central protrusion is formed at the center of the ring of the annular coupling protrusion.

31. The absorbent article of claim 30, wherein:

the side region has a third protrusion,

height H of the central protrusion₄Height H from the second convex part₂The height H of the central convex part is the same₄Height H higher than the third convex part₃。

32. The absorbent article of claim 30 or 31, wherein:

the second, third, central and third protrusions are arranged regularly and linearly along a first direction, which is one direction within the plane of the composite sheet, in the order of the second, third, central and third protrusions.

33. The absorbent article of claim 1 or 2, wherein:

the bending stiffness of the side regions of the composite sheet is higher than the bending stiffness of the central region.

34. The absorbent article of claim 33, wherein:

the ratio of the bending stiffness of the side region to the bending stiffness of the central region is 1.1 or more.

35. The absorbent article of any of claims 33, wherein:

the side region has a bending stiffness of 10cN to 50 cN.

36. The absorbent article of claim 33, wherein:

the bending rigidity of the central region is 5cN to 40 cN.

37. The absorbent article of claim 7, wherein:

the arrangement pitch of the joints in the first joint row and the second joint row is 1.1 to 10 times the shortest distance between adjacent joints.

38. The absorbent article of claim 1 or 2, wherein:

the convex portion formed in the central region has a shape in which a low convex portion extends from a high convex portion of the central portion to the four directions.

39. The absorbent article of claim 38, wherein:

the composite sheet has a pair of first low projections extending from the high projections in one direction of the in-plane direction of the sheet, and another pair of second low projections extending from the high projections in the other direction orthogonal to the one direction of the in-plane direction of the sheet, as 4 low projections constituting the projections,

the first low protrusion has a longer extension length from the high protrusion to the outermost end than the second low protrusion.

40. The absorbent article of claim 38, wherein:

the high convex portion has a recess recessed in an inner direction of the convex portion at a boundary portion with the low convex portion.

41. The absorbent article of claim 1 or 2, wherein:

a plurality of protrusions having the largest height in the central region and a plurality of protrusions having the largest height in the side regions are intermittently formed in the first direction of the composite sheet,

the convex portions having the largest height in the central region and the convex portions having the largest height in the side regions are formed at positions different from each other in the first direction.

42. The absorbent article of claim 1 or 2, wherein:

in the composite sheet, in the central region, central continuous protrusions each extend in the second direction and are formed in a plurality of rows in the first direction; in the side regions, side continuous protrusions extend in the second direction and are formed in a plurality of rows in the first direction, respectively,

the central continuous protrusions and the side continuous protrusions are alternately arranged in the first direction.

43. The absorbent article of claim 42, wherein:

a boundary region where both the central continuous protrusion and the side continuous protrusion are present at a boundary between the central region and the side region,

in the boundary region, the central continuous protrusions and the side continuous protrusions are alternately arranged in the first direction.

44. The absorbent article of claim 1 or 2, wherein:

which comprises an abdomen-side part disposed on the abdomen-side of a wearer when worn, a back-side part disposed on the back-side of the wearer when worn, and a disposable diaper positioned at the crotch part between the abdomen-side part and the back-side part,

a plurality of elastic members for contracting the disposable diaper in the width direction are disposed at least in the width direction center portion of the back portion at intervals in the longitudinal direction of the disposable diaper,

in the central region of the composite sheet, a plurality of central continuous protrusions are formed extending in the second direction and spaced apart from each other in the first direction,

a plurality of elastic member disposition regions in which the plurality of elastic members are disposed, the central continuous protrusions extending in the second direction and being formed in plurality,

when the width of the central continuous protrusion is P1, the interval between the elastic members is P2, and the interval between the central portions of the central continuous protrusions is P3, the relationship of P1 < P2 < P3 is satisfied.

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