JP6083911B2 - Absorbent articles - Google Patents

Description

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

  Conventionally, as a surface sheet of an absorbent article such as a disposable diaper, a sanitary napkin, an incontinence pad, etc., an uneven surface formed by embossing or the like is known on the skin side face directed to the skin side of the wearer. Moreover, the technique which improves the leak prevention effect of soft stool, urine, etc. by forming uneven | corrugated shape in the skin side surface of a surface sheet is also known (patent documents 1, 2).

  However, in order to improve the fit when wearing, if the absorber is thinned or a hole is made in a part of the absorber to reduce the rigidity of the absorber, the surface sheet in the crotch will be wrinkled. And the leakage prevention effect due to the uneven shape of the top sheet is reduced, and soft stool and urine flow along the wrinkles, and leakage easily occurs.

  In addition, in order to suppress loose stool and urine leakage from the crotch, in the side region of the surface sheet disposed on both sides of the absorbent body, the unevenness having a height difference larger than the unevenness provided in the central region is formed, A technique is also known in which loose stool or urine is prevented from flowing laterally toward the side of the absorbent article (see Patent Document 3).

JP 2004-174234 A JP 2009-136349 A JP 2009-148445 A

However, as in the technique described in Patent Document 3, when the unevenness having a height difference higher than the unevenness disposed between them is formed in the side region of the surface sheet disposed on both sides of the absorber, the absorption When a product is stored in a packaging bag that is compressed and packed by packaging, the pressure is concentrated on the high convex part in the side region, and the convex part is difficult to maintain, and the degree of compression If the storage time is increased or the storage period is lengthened, the effect of preventing leakage due to unevenness may be reduced.
In addition, when a side region having a convex portion that is continuous or in series in the longitudinal direction of the absorbent article is formed on the topsheet, the side region when the absorbent article contracts in the longitudinal direction due to a three-dimensional gather, leg gather, or the like. There is a risk that wrinkles will enter and the effect of preventing leakage due to unevenness will not be sufficiently obtained.

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

  The present invention is an absorbent article comprising a top sheet, a back sheet, and an absorbent body disposed between the two sheets, wherein the composite sheet has a first direction and an article width along the longitudinal direction of the article. The first sheet and the second sheet that are stacked are partially joined to form a plurality of joints, and the first sheet is a second sheet at a portion other than the joints. Projecting toward the wearer's skin side, and forming the convex portion projecting toward the wearer's skin, the composite sheet has a central region in which the convex portions are formed in different patterns, and both sides of the central region Each of the side regions has a higher area ratio than the joint portion in the central region, and the central region and each of the side regions. The height is the same height of the maximum of the convex portion, there is provided an absorbent article.

  According to the absorbent article of the present invention, the boundary between the center region and the side region of the topsheet is likely to be bent, and the absorbent article is easily deformed into a boat shape when worn, and excellent leakage prevention performance is obtained. In addition, with the excellent leakage prevention performance, the height of the convex part with the maximum height is the same in the central area and the side area, while the convex pattern formed in the central area and the side area is made different. Therefore, even if the absorbent article is stored in a state of being compressed and filled in a packaging bag, the leakage prevention performance is hardly lowered. The boat-shaped shape means that the absorbent article has a cross section along the longitudinal direction curved in a concave shape with the skin contact surface side inward, and the side region of the top sheet is near the boundary with the central region. A state of bending and standing up so as to approach the wearer's skin.

FIG. 1 is a plan view showing a basic configuration of a disposable diaper as an embodiment of the absorbent article of the present invention. 2 is a cross-sectional view taken along line II-II in FIG. FIG. 3: is a top view which shows the surface sheet of the disposable diaper of 1st Embodiment, and the one part enlarged plan view. FIG. 4 is an enlarged perspective view showing a part of the central region of the composite sheet used in the first embodiment. FIG. 5 is an enlarged perspective view showing a part of the side region of the composite sheet used in the first embodiment. FIG. 6 is an enlarged plan view showing a part of the central region of the composite sheet used in the first embodiment. FIG. 7 is an enlarged plan view showing 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 FIGS. 6 and 7 in a further enlarged manner. 9A is a cross-sectional view taken along the line VIa-VIa in FIG. 8, and FIG. 9B is a cross-sectional view taken along the line VIb-VIb in FIG. FIG. 10 is an enlarged plan view showing a part of the side region of the composite sheet used in the first embodiment. 11 is a cross-sectional view taken along line III-III in FIG. 12 is a cross-sectional view taken along line IV-IV in FIG. FIG. 13A and FIG. 13B are plan views showing a part of the side region of the composite sheet shown in FIG. 3 in an enlarged manner. 14 (a) and 14 (b) are plan views showing an enlarged part of the side region of the composite sheet shown in FIG. FIG. 15 is a schematic view showing an apparatus suitably used for manufacturing the composite sheet shown in FIG. FIG. 16 is a perspective view of a state where the central region forming part of the first roll in the apparatus shown in FIG. 15 is disassembled. FIG. 17 is a perspective view of a state where the side area forming portion of the first roll in the apparatus shown in FIG. 15 is disassembled. FIG. 18 is a diagram in which the peripheral surface of the central region forming portion of the first roll in the apparatus shown in FIG. FIG. 19 is a diagram in which the peripheral surface of the side portion forming portion of the second roll in the apparatus shown in FIG. FIG. 20 is a diagram in which a state in which the convex portion of the second roll shown in FIG. 19 is engaged with the peripheral surface in the central region forming part of the first roll shown in FIG. 18 is developed in a plane. FIG. 21 is a diagram in which the peripheral surface of the side region forming portion of the first roll in the apparatus shown in FIG. FIG. 22 is a diagram in which the peripheral surface of the side region forming part of the second roll in the apparatus shown in FIG. FIG. 23 is a diagram in which a state where the convex portion of the second roll shown in FIG. 22 meshes with the peripheral surface of the side region forming portion of the first roll shown in FIG. 21 is developed in a plane. FIG. 24 is a plan view showing a top sheet of the disposable diaper of the second embodiment. FIG. 25 is an enlarged perspective view showing a part of the side region of the composite sheet used in the second embodiment. FIG. 26 is an enlarged plan view showing a part of the side region of the composite sheet used in the second embodiment. FIG. 27 is a plan view showing a part of the side region shown in FIG. 26 further enlarged. 28A is a cross-sectional view taken along the line VIa-VIa in FIG. 27, and FIG. 28B is a cross-sectional view taken along the line VIb-VIb in FIG. FIG. 29 is a view corresponding to FIG. 23 of the side region forming part of the first roll and the second roll used for manufacturing the composite sheet used in the second embodiment. FIG. 30 is a plan view showing a top sheet of the disposable diaper of the third embodiment. FIG. 31 is an enlarged plan view showing a part of the central region of the composite sheet used in the third embodiment. FIG. 32 is an enlarged plan view showing a part of the side region of the composite sheet used in the third embodiment. FIG. 33: is a top view which shows the surface sheet of the disposable diaper of 4th Embodiment. FIG. 34 is an enlarged plan view showing the vicinity of the boundary between the central region and the side region of the composite sheet used in the fourth embodiment. 35A is a sectional view taken along the line Va-Va in FIG. 34, FIG. 35B is a sectional view taken along the line Vb-Vb in FIG. 34, and FIG. 35C is a sectional view taken along the line Vc-Vc in FIG. It is. 36D is a cross-sectional view taken along line Vd-Vd in FIG. 34, and FIG. 36E is a cross-sectional view taken along line Ve-Ve in FIG. FIG. 37 is a view corresponding to FIGS. 20 and 23 of the first roll and the second roll used for manufacturing the composite sheet used in the fourth embodiment. FIG. 38 is a plan view showing a back side portion of a disposable diaper having a more preferable 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 on the back side of the disposable diaper shown in FIG. 38.

Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings.
1 and 2 show a basic structure of a disposable diaper 100 (hereinafter also simply referred to as diaper 100), which is an embodiment of the absorbent article of the present invention.
As shown in FIGS. 1 and 2, the diaper 100 includes a liquid-permeable top sheet 12, a liquid-impermeable back sheet 13, and an absorber 14 disposed between the sheets 12 and 13. With respect to the back sheet 13, the liquid impermeability is a concept including poor liquid permeability, and includes cases where the back sheet 13 is made of a water-repellent sheet or the like in addition to the case where the liquid does not pass through the liquid at all.

  The diaper 100 has an article longitudinal direction Xa which is a direction coinciding with the wearer's front-rear direction when worn, and an article width orthogonal to the article longitudinal direction Xa in a state where the diaper 100 is expanded in a planar shape as shown in FIG. Direction Ya. Further, the diaper 100 includes, in the article longitudinal direction Xa, an abdominal side A that is disposed on the abdomen side of the wearer when worn, a back side B that is disposed on the back side of the wearer when worn, and an abdominal side part A. The crotch portion C is located between the back side portion B and the back side portion B. The diaper 100 is an unfolded disposable diaper. Fastening tapes 17 are provided on both side edges of the back side B, and a landing zone 18 that fastens the fastening tape 17 to the outer surface of the abdominal side A. Is provided.

  The absorbent body 14 in the diaper 100 includes an absorbent core 14a and a core wrap sheet 14b that wraps the absorbent core 14a. The absorptive core 14a can be comprised from the laminated fiber body of liquid absorbing fibers, such as a pulp fiber, for example, and the mixed fiber body of a liquid absorbing fiber and a water absorbing polymer. Examples of the liquid-absorbing fiber include cellulose-based hydrophilic fibers such as pulp fiber, rayon fiber, cotton fiber, and cellulose acetate. In addition to cellulosic hydrophilic fibers, fibers made of a synthetic resin such as polyolefin, polyester, polyamide, etc., made hydrophilic with a surfactant or the like can also be used. As the core wrap sheet 14b, for example, tissue paper or a water-permeable nonwoven fabric is used. One core wrap sheet 14b may wrap the entire absorbent core 14a, or a combination of two or more sheets may wrap the absorbent core 14a. As the back sheet 13, a liquid-impermeable or water-repellent resin film, a laminate sheet of a resin film and a nonwoven fabric, or the like is used.

  Sheets 15 for forming a three-dimensional gather having elastic members 15a are arranged on both sides of the article longitudinal direction Xa in the diaper 100, and the skin of the wearer is placed on the crotch portion C in a worn state by contraction of the elastic members 15a. A three-dimensional gather standing up toward the side is formed. In addition, the leg elastic member 16 is disposed in an extended state at a portion disposed around the leg in the crotch C. Due to the contraction, the leg crotch C fits around the wearer's leg in the worn state. Leg gathers that improve

The surface sheet 12 in the disposable diaper 100 of 1st Embodiment is comprised from the composite sheet 10 shown in FIG.
As shown in FIG. 3, the composite sheet 10 includes 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. Have. Further, as shown in FIG. 3, the composite sheet 10 includes a central region M in which the convex portions 40 to 42 are formed in different patterns and a pair of side regions S and S located on both sides of the central region M. doing. The central region M is located in the central portion of the diaper 100 in the width direction (article width direction) Ya, and the pair of side regions S and S are formed outside both side edges along the second direction Y of the central region M. ing. The central region M having convex portions formed in different patterns and the side regions S and S on both sides thereof are preferably formed at least in the crotch portion C in the longitudinal direction Xa of the diaper 100. It is preferable that it is formed over either one or both of the ventral side A and the back side B, or over the entire length of the absorbent body 4, and further over the entire length of the diaper 100. preferable.

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

  As shown in FIGS. 4 and 5, the composite sheet 10 includes a plurality of laminated first sheets 1 and 2 that are partially joined by embossing in both the central region M and the side region S. The first sheet 1 protrudes in a direction away from the second sheet 2 at a portion other than the bonding part, and forms a convex part protruding toward the wearer's skin side. . The composite sheet 10 has a substantially flat surface on the second sheet 2 side in both the central region M and the side region S, and has unevenness on the first sheet 1 side.

  The first sheet 1 and the second sheet 2 are made of a sheet material. As the sheet material, for example, a fiber sheet such as a nonwoven fabric, a woven fabric, and a knitted fabric, a film, and the like can be used. From the viewpoint of touch and the like, it is preferable to use a fiber sheet, and it is particularly preferable to use a nonwoven fabric. The kind of sheet material which comprises the 1st sheet | seat 1 and the 2nd sheet | seat 2 may be the same, or may differ.

Examples of the nonwoven fabric used when the nonwoven fabric is used as the sheet material constituting the first sheet 1 and the second sheet 2 include air-through nonwoven fabric, spunbond nonwoven fabric, spunlace nonwoven fabric, meltblown nonwoven fabric, resin bond nonwoven fabric, and needle punch nonwoven fabric. It is done. A laminate obtained by combining two or more of these nonwoven fabrics, or a laminate obtained by combining these nonwoven fabrics and a film can also be used. Among these, it is preferable to use an air-through nonwoven fabric or a spunbonded nonwoven fabric. The basis weight of the nonwoven fabric used as the sheet material constituting the first sheet 1 and the second sheet 2 is preferably 10 g / m ² or more, more preferably 15 g / m.
m ² or more, preferably 40 g / m ² or less, more preferably 35 g / m ² or less. The basis weight of the nonwoven fabric is preferably 10 g / m ² or more and 40 g / m ² or less, and more preferably 15 g / m ² or more and 35 g / m ² or less.

  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, polymethacrylic acid alkyl ester, polyvinyl chloride, and polyvinylidene chloride. These resins can be used alone or as a blend of two or more. Further, it can be used in the form of a composite fiber such as a core-sheath type or a side-by-side type.

[Configuration of the central region M of the composite sheet 10]
6 and 7 show enlarged plan views of the central region M of the composite sheet 10 shown in FIG. FIG. 8 is an enlarged plan view showing a part of the central region shown in FIGS. 6 and 7 in an enlarged manner. 9A and 9B are a sectional view taken along line VIa-VIa in FIG. 8 and a sectional view taken along line VIb-VIb in FIG.
As shown in FIGS. 3, 4, and 6, the convex portions 40 described above 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 convex portions 40 are arranged in a staggered manner. More specifically, as shown in FIG. 6, the convex portion 40 includes a first direction convex portion row 4 </ b> X in which a plurality of convex portions 40 are arranged in series along the first direction X at regular intervals, and the plurality of convex portions 40. Are arranged in the second direction Y along the second direction Y at a constant interval, and the plurality of convex portions 40 are inclined with respect to both the first direction X and the second direction Y at a constant interval. It arrange | positions so that it may have 3rd direction convex part row | line | column 4XY in series along the 3rd direction. Also, the second direction convex portion rows 4Y adjacent in the first direction X have the arrangement positions of the convex portions 40 shifted by a half pitch in the second direction Y, and the first direction convex portions adjacent in the second direction Y. In the rows 4X, the arrangement positions of the convex portions 40 are shifted by a half pitch in the first direction X.

Moreover, each convex part 40 formed in the center area | region M of the composite sheet 10 has the hollow part 41V in the back surface side, as shown in FIG.8, FIG.9 (a) and FIG.9 (b), and this convex part. 40 high convex part 41 'which forms the top part 40t of 40, and around this high convex part 41', it comprises four low convex parts 42 formed in the state connected with this high convex part 41 '. Yes. In this specification, regarding the high convex portion 41 ′ and the low convex portion 42 ′ formed around the high convex portion 41 ′, the connected state means that the adjacent high convex portion 41 ′ and low convex portion 42 ′ It means that the surface of the joint 3 protrudes continuously from the first sheet 1 side without being separated by the joint 3.
In the plan view of the composite sheet 10, each convex portion 40 has a shape in which a low convex portion 42 extends in four directions from a central high convex portion 41 ′, and has a substantially cross shape. In other words, in the plan view of the composite sheet 10, each convex portion 40 has a hollow 45 that is recessed toward the high convex portion 41 ′ between the low convex portions 42 ′ adjacent in the circumferential direction of the convex portion. Have.

  The composite sheet 10 includes a first joint 31, a second joint 32, and a third joint 33 as a joint 3 formed by partially joining the first sheet 1 and the second sheet 2 that are laminated. Is formed. In these joint portions 31 to 33, the first sheet 1 and the second sheet 2 are integrally pressed, and both the sheets are densified as compared to the other portions. Or both the sheets are heat-sealed by melting of the constituent resins of both sheets and subsequent solidification.

  Further, as shown in FIG. 7, the joint portion 3 in the central region M of the composite sheet 10 includes a plurality of grid-formed first joint rows in which a plurality of joint portions 3 are arranged in series in a straight line at intervals. LR1 and a plurality of joints 3 are formed in a grid-like arrangement pattern composed of a plurality of grid-formed second joint rows LR2 that are arranged in series in a straight line at intervals. The convex part 40 of the form mentioned above is formed in each of the locations corresponding to. In the central region M of the composite sheet 10, the lattice-formed first joint row LR1 and the lattice-formed second joint row LR2 intersect each other at every other joint in each row, and the convex portion Each of the lattice eyes on which 40 is formed is surrounded by eight joints 3.

  Further, the joint portions 3 in the central region M of the composite sheet 10 are arranged in an oblique lattice shape inclined with respect to the first direction X and the second direction Y, as shown in FIG. That is, each of the lattice formation first joint row LR1 and the lattice formation second joint row LR2 is inclined with respect to the first direction X and the second direction Y, respectively. The angle θ (see FIG. 7) formed by the lattice-formed first joint row LR1 and the lattice-formed second joint row LR2 is preferably 30 ° to 165 °, more preferably 45 ° to 150 °, and still more preferably. Is more than 90 ° and 120 ° or less.

  As shown in FIGS. 6 and 8, the arrangement positions in the second direction Y of the first joint portion 31, the second joint portion 32, and the third joint portion 33 in the central region M of the composite sheet 10 are different. The first joint portion 31 to the third joint portion 33 have the same shape and size. Here, the same shape and size means that the shape is the same and the difference in size is within ± 20% in terms of area. Each of the first joint 31 to the third joint 33 has a rectangular shape in plan view, and each side of the rectangle coincides with the first direction X or the second direction Y.

A plurality of the first joint portions 31 are arranged in a line at a constant pitch along the second direction Y to form the first joint portion row R1. The plurality of second joint portions 32 are also arranged in a row at a constant pitch along the second direction Y to form a second joint portion row R2. The plurality of third joint portions 33 are also arranged in a line at a constant pitch along the second direction Y to form a third joint portion row R3.
The first joint row R1 and the third joint row R3 are formed in multiple rows in the first direction X with a certain interval, and between the joints in the second direction Y of the first joint row R1. The pitch (distance between center points) and the pitch (distance between center points) between the joints in the second direction Y of the third joint row R3 are the same. The arrangement position in the second direction Y is such that the third joint 33 is located at the center between the first joints 31 adjacent in the second direction Y, and between the third joints 33 adjacent in the second direction Y. It arrange | positions so that the 1st junction part 31 may be located in the center part. The second joint row R2 is formed at the center between the first joint row R1 and the third joint row R3, and between the first joint row R1 and the third joint row R3. There is an interval between each. As for 2nd junction part row | line | column R2, the pitch (distance between center points) between junction parts is a half of the pitch (distance between center points) between junction parts in 1st and 3rd junction part row | line | columns R1, R3, and 1st. When viewed along the two directions Y, the arrangement position of the second joint portion 32 is a central portion between the arrangement position of the first joint portion 31 and the arrangement position of the third joint portion 33.

A portion corresponding to the portion surrounded by the first to third joint portions 31 to 33 when the first to third joint portions 31 to 33 are formed in this manner and the composite sheet 10 is manufactured. Are pressed from the back surface side or sucked from the front surface side, and so on, a large number of specially shaped convex portions 40 are formed in the central region M of the composite sheet 10.
The convex portion 40 will be further described. As shown in FIG. 8, two first joint portions 31 adjacent to each other in the first joint portion row R1, and two second portions located on both sides of the first joint portion row R1. It is surrounded by a total of eight joints composed of a total of four second joints 32 in the joint part row R2 and two third joints 33 in the two third joint part rows R3 located further outside. Yes. The high convex portion 41 ′ of the convex portion 40 is surrounded by the four second joint portions 32 in a plan view, is circular or elliptical, and is a region surrounded by the four second joint portions 32. The top part 40t of the convex part 40 is formed in the center part. Between the two second joint portions 32 facing each other in the first direction X, the first low convex portion 42a is located, and between the two second joint portions 32 facing each other in the second direction Y, The second low convex part 42b is located. Further, each of the four second joint portions 32 is in a state where a part of the four second joint portions 32 enters the above-described four recess portions 45. The convex portion 40 is separated from another adjacent convex portion 40 by an annular concave portion including eight joint portions 3 surrounding the convex portion 40 and a third convex portion 43 located between the joint portions 3. It has been. The third convex portion 43 is literally a “convex portion”, but the third convex portion 43 is relatively lower in height than either the high convex portion 41 ′ or the low convex portion 42 constituting the convex portion 40. Therefore, it becomes a recessed part relatively seeing from these convex parts.

  In addition, about the convex part 40 of the 2nd direction convex part row | line | column 4Y adjacent to the 2nd direction convex part row | line | column 4Y containing the convex part 40 shown in FIG. 6, a 1st junction part, a 1st junction part row | line | column, and a 3rd junction part And the third joint row are reversed. That is, with respect to the convex portion 40 in the second direction convex portion row 4Y, two adjacent third joint portions 33 in the third joint portion row R3, and two pieces located on both sides of the third joint portion row Surrounded by a total of eight joints consisting of a total of four second joints 32 in the second joint row R2 and two first joints 31 in the two first joint rows R1 located further outside. It is.

[Configuration of Side Area S of Composite Sheet 10]
As shown in FIG. 3, in the pair of side regions S, S of the composite sheet 10, the first sheet 2 has a central portion that protrudes in a direction away from the second sheet at a portion other than the joint portion. It is formed in a pattern different from the convex portion in the region M. The expression that the pattern of the convex part is different includes any of the case where only the arrangement of the convex part is different, the case where the form of the convex part is different, and the case where both are different. The aspect in which the arrangement of the convex portions is different includes a case where the distance between the convex portions is different. Moreover, the aspect from which the form of a convex part differs also includes the case where the planar view shape of a convex part differs.
In the composite sheet 10 of the present embodiment, the arrangement and form of the protrusions are different between the central region M and the pair of side regions S, S.

FIG. 10 shows an enlarged plan view of the side region S of the composite sheet 10 shown in FIG. 11 and 12 are a sectional view taken along line III-III and a sectional view taken along line IV-IV in FIG. 10, respectively.
As shown in these drawings, in the side region S of the composite sheet 10, the first sheet 41 constituting the first sheet 1, the three kinds of protrusions having different heights, the first protrusion 41 and the second protrusion 42 and the 3rd convex part 43 are formed. These three types of convex portions are distinguished from each other in that their heights are different. 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, when the height of the first convex portion 41 is H ₁ , the height of the second convex portion 42 is H ₂ , and the height of the third convex portion 43 is H ₃ , these are H ₁ ≧ H ₂ > H The relationship of ₃ is satisfied. A plurality of convex portions 41, 42, 43 are formed. Each of the first convex portion 41 and the second convex portion 42 in the side region S has a substantially circular shape in plan view. The first convex portion 41 is larger in circular diameter than the second convex portion 42. The 1st convex part 41 and the 2nd convex part 42 have the shape which has a top part in the cross section in any direction of the 1st direction X and the 2nd direction Y. On the other hand, the third convex portion 43 has a substantially rectangular shape in plan view that is long along the first direction X. The upper surface of the third convex portion 43 is substantially flat.

  FIG. 13A and FIG. 13B are plan views showing the main part of FIG. As is apparent from these drawings, the side region S of the composite sheet 10 is formed by connecting one or more first protrusions 41 and one or more second protrusions 42 to form an annular connection protrusion 44. Yes. The annular connecting convex portion 44 has a substantially annular shape in plan view. The annular connecting convex portion 44 is formed by connecting six first convex portions 41 and two second convex portions 42. Specifically, in a plan view of the composite sheet 10, the composite sheet 10 is symmetrical with respect to the center line CL that connects the centers of the two second convex portions 42a and 42b arranged at a distance along the first direction X. A pair of first convex portion groups 41 </ b> A including three first convex portions 41 a, 41 b, 41 c arranged along the first direction X is located at a position. The three first convex portions 41a, 41b, and 41c constituting the first convex portion group 41A are connected along the first direction X. Of the three first convex portions 41a, 41b, and 41c constituting the first convex portion group 41A, the first convex portions 41a and 41c that are located at the end portions along the first direction X have the center positions thereof. , When viewed along the second direction Y. And the 2nd 1st convex part 41b located along the 1st direction X is biased to the outward along the 2nd direction Y rather than the other 1st convex parts 41a and 41c. In the pair of first convex portion groups 41A, among the first convex portion groups 41A, the first convex portions 41a and 41a located on one end side along the first direction X are two second convex portions. 42a and 42b, it is connected with the 2nd convex part 42a located in the one end side along the 1st direction X. Moreover, in a pair of 1st convex part group 41A, the 1st convex parts 41c and 41c located in the other edge part side along the 1st direction X among each 1st convex part groups 41A are two 2nd 2nd. It connects with the 2nd convex part 42b located in the other edge part side along the 1st direction X among convex parts 42a and 42b. As a result, one annular connecting convex portion 44 is formed by a total of eight convex portions including a total of six first convex portions 41a, 41b, 41c and a total of two second convex portions 42a, 42b. ing.

  When the composite sheet 10 is viewed in plan, the annular coupling convex portions 44 are linearly arranged in a row at a constant distance along the first direction X, thereby constituting an annular coupling convex portion row. The annular connection convex portion rows are arranged in multiple rows at a constant distance in the second direction Y. When attention is paid to one annular connecting convex part row, the arrangement of the annular connecting convex parts 44 is shifted by a half pitch between the adjacent annular connecting convex part rows. When attention is paid to one of the plurality of annular coupling convex portions 44 constituting one annular coupling convex portion row, the convex portion constituting the annular coupling convex portion 44 is adjacent to the front and rear thereof. The convex part which comprises a cyclic | annular connection convex part overlaps partially. For example, as shown in FIG. 14A, when attention is paid to one annular connecting convex portion 44A and another annular connecting convex portion 44B adjacent thereto along the first direction X, two annular connecting convex portions 44A are provided. The first convex portions 41c and 41c and the one second convex portion 42b overlap the two first convex portions 41a and 41a and the one second convex portion 42a of the annular coupling convex portion 44B. Further, as shown in FIG. 14B, when attention is paid to one annular connecting convex row 45A and the adjacent annular connecting convex row 45B, one annular constituting the annular connecting convex row 45A. The first convex portions 41b and 41c of the connecting convex portion 44A overlap with the first convex portions 41a and 41b of one annular connecting convex portion 44B constituting the annular connecting convex portion row 45B.

As shown in FIGS. 13A and 13B, a central convex portion 46 is formed in the ring of the annular coupling convex portion 44 at the approximate center thereof. One central convex portion 46 is formed in the ring of one annular connecting convex portion 44. As with the other convex portions, the central convex portion 46 is formed so as to protrude from the first sheet 1 in the direction away from the second sheet, and is preferably formed apart. The central convex portion 46 has a substantially circular shape in plan view. The circular diameter substantially coincides with the second convex portion 42. Further, as shown in FIG. 12, the height H ₄ of the central convex portion 46 is substantially the same as the height H ₂ of the second convex portion 43. The height H ₄ of the central convex portion 46 is higher than the height H ₃ of the third convex portion. The central convex portion 46 has a shape having a top portion in a cross section in any of the first direction X and the second direction Y.

  The annular connecting convex portion 44 and the central convex portion 46 located in the ring are separated by an annular concave portion 47 as shown in FIGS. 13 (a) and 13 (b). The annular recess 47 is composed of a joint portion and a third protrusion 43. Specifically, a joint portion is configured by a first joint portion 31 that is vertically long along the first direction X in plan view and a second joint portion 32 that is substantially square in plan view. An annular concave portion 47 is formed by the joint portions 31 and 32 and the two third convex portions 43. Although the third convex portion 43 is literally a “convex portion”, the third convex portion 43 is relatively higher than the first convex portion 41 and the second convex portion 42 constituting the annular connecting convex portion 44. Since the height is relatively low and the height is relatively lower than the central convex portion 46, the concave portions are relatively seen from these convex portions.

  The annular recess 47 includes two first joint portions 31, four second joint portions 32, and two third convex portions 43. Specifically, as shown in FIG. 13B, in the plan view of the composite sheet 10, a center line connecting the centers of the two third convex portions 43 arranged at a distance along the first direction X. A pair of joint portions 33 in which the second joint portion 32, the first joint portion 31, and the second joint portion 32 are arranged in this order along the first direction X are positioned in line-symmetric positions across the CL. Yes. Of the three joints 31 and 32 constituting the joint group 33, the second joint 32 located at the end along the first direction X has a center position seen along the second direction Y. At the same position. And the 2nd 1st junction part 31 located along the 1st direction X is biased to the outward along the 2nd direction Y rather than the two 2nd junction parts 32. As shown in FIG.

  As shown in FIG. 10, a plurality of the central convex portions 46 are linearly arranged in a row at a constant distance along the first direction X that is one direction in the plane of the composite sheet 10. The central convex row is constituted. This center convex part row | line | column is arrange | positioned in multiple rows at a fixed distance in the 2nd direction Y. When attention is paid to one central convex portion row, the arrangement of the central convex portions 46 is shifted by a half pitch between the adjacent central convex portion rows. Similarly, as shown in FIG. 10, a plurality of the second convex portions 42 are linearly arranged in a row at a certain distance along the first direction X which is one direction in the plane of the composite sheet 10. Thus, the second convex row is formed. This 2nd convex part row | line | column is arrange | positioned in multiple rows at a fixed distance in the 2nd direction Y. When attention is paid to one second convex portion row, the arrangement of the second convex portions 42 is shifted by a half pitch between the second convex portion row adjacent thereto.

  The above-described second convex portion row and the central convex portion row of the side region S are arranged at the same position in the plan view of the composite sheet 10. Specifically, as shown in FIG. 10, the second convex portions 42 and the central convex portions 46 are alternately and linearly arranged along the first direction X which is one direction in the plane of the composite sheet 10. ing. Further, when attention is paid to the third convex portion 43 in addition to the second convex portion 42 and the central convex portion 46, these three types of convex portions are the second convex portion 42, the third convex portion 43, and the central convex portion 46. The 3rd convex part 43 is arrange | positioned regularly and linearly along the 1st direction X which is one direction in the surface of the composite sheet 10 in this order.

  On the other hand, for the second direction Y orthogonal to the first direction X, as shown in FIG. 10, the first joint portion 31, the central convex portion 46, and the first joint located on the straight line L extending along the second direction Y. The period is repeated along the second direction Y, with the portion 31, the first convex portion 41, the second convex portion 42, and the first convex portion 41 as one cycle.

  The joint 3 (first to third joints) in the central region M and the first joint 31 and the second joint 32 in the side region S can be formed by various means. When the first sheet 1 and the second sheet 2 are made of a material that can be heat-sealed, heat, ultrasonic waves, high-frequency fusion, or the like can be used. Regardless of the material of the first sheet 1 and the second sheet 2, adhesion by an adhesive can also be used. When both sheets 1 and 2 are joined by using heat, ultrasonic waves, and high-frequency fusion, the joined portion is consolidated as compared with a portion other than the joined portion. When the sheets 1 and 2 are made of fiber sheets, the distance between fibers is shortened by consolidation, or the fiber form is lost and film formation occurs. In the manufacturing method of the composite sheet 10 to be described later, both the sheets 1 and 2 are joined by thermal fusion to form a joined portion including a fused portion.

  In the diaper 100 of 1st Embodiment, as shown in FIG. 3, the center area | region M is located in the center part of the width direction Ya of the diaper, and a pair of side area | region S is the composite sheet 10 which has the above structure. , S are arranged on the absorbent body 14 so as to be located on both sides of the central region M, and used as the liquid-permeable surface sheet 12.

Moreover, as above-mentioned, the composite sheet 10 in the diaper 100 forms the junction part 31 and 32 in the side area | region S because the junction part is formed in the center area | region M and a pair of side area S and S in a different pattern. The area ratio is higher 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 center region M and the side regions S, S of the topsheet is likely to be bent, and the diaper is easily deformed into a boat shape when the diaper is worn. Leak prevention performance is obtained. Moreover, since the excellent leakage prevention performance is realized by changing the formation pattern of the convex portions formed in the central region M and the side region S, the diaper 100 is stored in a state of being compressed and filled in a packaging bag. However, it is difficult for the leakage prevention performance to decrease.
On the other hand, when the side leakage prevention property is improved only by improving the height of the convex portion of the side region S rather than the convex portion of the central region M, the packaging bag is compressed and filled. When stored at, the convex portions of the side regions are crushed, and the leakage prevention performance is likely to deteriorate. The storage here includes storage in a manufacturing factory, storage in a distribution stage (including the display state of a store), storage in the home of a general consumer, and the like.

  The difference between the area ratio Es (%) of the joint in the side region S and the area ratio Em (%) of the joint in the central region M (Es−Em, percentage point) ) Is preferably 5% or more, more preferably 10% or more. Further, the area ratio Es of the joint in the side region S is preferably 5% or more, more preferably 10% or more, and preferably 50% or less, more preferably, on the assumption that the area ratio Es is larger than the area ratio Em. It is 30% or less, preferably 5% or more and 50% or less, more preferably 10% or more and 30% or less. In addition, the junction Em in the central region M is preferably 30% or less, more preferably 20% or less, preferably 3% or more, more preferably 5% or more, on the premise that the joint area Em is smaller than the area ratio Es. It is preferably 3% or more and 30% or less, more preferably 5% or more and 20% or less.

(Calculation method of area ratio of joints)
Along the first direction X and the second direction Y, the area ratio of the joints in the region for one cycle in which the arrangement of the joints and the protrusions is regularly repeated was calculated. The method for measuring the area of the joint is as follows. The composite sheet 10 is observed from the second sheet 2 side using a microscope (VHX-1000 manufactured by KEYENCE Corp.) at a magnification of 20 to 100 times, and the image analysis apparatus is used. 1 cycle of area of the region ^(cm 2), and the area of the joint portion (cm ²⁾ was measured, expressed in [(area of junction) / (area of one cycle)] × 100.

  From the viewpoint of improving the deformability to the shape of a boat, the composite sheet 10 preferably has higher bending rigidity in the side region S than in the central region M. The bending stiffness is measured according to JIS P8126. The specific method is as follows.

(Measurement method of bending stiffness)
30 mm along the first direction X and 110 mm along the second direction Y are cut out from the composite sheet 10 as a test piece, formed into a cylindrical shape with a height of 30 mm so that the first sheet side is on the outside, and an upper end with an overlap width of 10 mm. The lower end was stopped with an ultrasonic seal to obtain a measurement sample. Using a compression tester, the maximum load indicated when the periphery of the measurement upper end was compressed in the cylinder direction at a compression speed of 10 mm / min was read. The average value of 5 samples was taken as the bending stiffness value.

  The ratio of the bending stiffness in the side region S to the bending stiffness in the central region M is preferably 1.1 or more, more preferably 1.2 or more. Further, on the assumption that the bending rigidity in the side region S is larger than the bending rigidity of the central region M, it is preferably 10 cN or more, more preferably 15 cN or more, and preferably 50 cN or less, more preferably 40 cN or less. Further, it is preferably 10 cN or more and 50 cN or less, more preferably 15 cN or more and 40 cN or less. Further, on the assumption that the bending stiffness in the central region S is lower than the bending stiffness in the side region S, it is preferably 40 cN or less, more preferably 30 cN or less, and preferably 5 cN or more, more preferably 10 cN or more. Further, it is preferably 5 cN or more and 40 cN or less, more preferably 10 cN or more and 30 cN or less.

  Moreover, in the diaper 100 of 1st Embodiment, the convex part 40 of the center area | region M and the convex parts 41-43, 46 of the side area | region S are all deform | transformed so that the 1st sheet | seat 1 may leave | separate from the 2nd sheet | seat 2. Therefore, the texture (feel) in the central region M and the side region S is also excellent.

  From the viewpoint of obtaining a good effect even after being stored in a compressed and packed state in the packaging bag, the convex portions 40 of the central region M and the convex portions 41 to 43, 46 of the side region S have a height. It is preferable that the heights of the maximum convex portions are the same. In the composite sheet 10 described above, the height H1 of the convex portion 40 in the central region M and the first convex portion in which the height of the side region S is maximum. It is preferable that the height H1 of 41 is the same. The expression that the height is the same here is the case where it is substantially the same in addition to the case where it is completely the same, for example, when the height of one convex portion is 90% to 110% of the height of the other convex portion. Is also included.

Moreover, in the diaper 100 of 1st Embodiment, the 1st junction part 31 formed in the side area | region S has the length of the 1st direction X longer than the length of the 2nd direction Y, The 1st direction X The length is longer than the length in the first direction X of any of the joint portions 31 to 33 of the joint portion 3 formed in the central region M.
By forming such a vertically long joint 31 in the side region S, the diaper 100 is easily bent near the boundary between the central region M and the side region S, and the crotch portion of the diaper is widened by the thigh. When compressed in the direction Ya, the diaper is flexibly compressed while maintaining the shape of the boat, thereby making it more difficult for stool or urine to leak when worn. Such an effect is that, as in the composite sheet 10A shown in FIG. 24, the length in the first direction X of all the joint portions (joint portions 31) formed in the side region S is This is also the case when the joint portions 31 to 33 are longer than the length in the first direction X.

  Of the joints formed in the side region S, the length of the longitudinal joint (first joint 31) whose length in the first direction X is longer than any joint formed in the central region M is: The length in the first direction of the joint portion (joint portions 31 to 33) formed in the central region M and having the maximum length in the first direction X is preferably 1.2 times or more, more preferably 1.5 times. Or more, preferably 5 times or less, more preferably 3.5 times or less, preferably 1.2 times or more and 5 times or less, more preferably 1.5 times or more and 3.5 times or less. .

Moreover, in the diaper 100 of 1st Embodiment, the convex part 40 is arrange | positioned in the center area | region M in zigzag form as mentioned above, and the six 1st convex parts 41 and 2 are arrange | positioned in the side area S. The annular coupling convex portions 44 in which the second convex portions 42 are annularly coupled are arranged in a staggered manner. About the side area | region S, the center convex part 46 is also arrange | positioned at zigzag form.
The convex part 40 is arrange | positioned in the center area | region M in zigzag form, and the diaper 100 is also arrange | positioned in the side area | region S by the annular connection convex part 44 which the convex parts 41 and 42 connected cyclically | annularly. It becomes easier to deform into a boat-shaped shape along the wearer's crotch, further improving the prevention of stool and urine leakage from the front and back and from the side. Such an effect is similarly obtained when 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 region S as in the composite sheet 10A shown in FIG. Played.

  Moreover, in the diaper 100 of 1st Embodiment, although the absorber 14 is comprised from the core wrap sheet | seat which wraps the absorptive core 14a and this absorptive core 14a, the absorptive core 14a is shown in FIG. As described above, the both sides of the crotch part C of the diaper have notches 14c and 14c having a concave shape in plan view in which the material for forming the absorbent core 14a is not disposed. The left and right side regions S, S of the composite sheet 10 described above overlap with the left and right cutouts 14c, 14c, respectively, as shown in FIG. The part which overlaps with the notch part 14c has overlapped with the side area | region S, and the part located outside from the inner edge of the notch part 14c of the diaper 100 stands | starts up toward a wearer's skin side, and a wearer's crotch part It becomes easy to deform into a boat shape that fits more. Thereby, the leakage prevention property is further improved. Note that the side region S preferably overlaps at least a part of the notch 14c, and more preferably overlaps the entire region of the notch 14c.

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

Instead of forming the notches 4c and 14c on both sides of the absorbent core 14a, the sides of the absorbent core 14a are spaced from the side edges of the absorbent core 14a on both sides of the longitudinal center line (not shown). It is also preferable to provide the penetrating portion that is formed and to overlap the side region S of the composite sheet 10 on the penetrating portion.
Since the portion that overlaps the penetrating portion overlaps the side region S, the portion that is located outward from the inner edge of the penetrating portion of the diaper 100 rises toward the skin side of the wearer, and further on the crotch portion of the wearer It becomes easy to be transformed into a boat shape that fits. The side region S preferably overlaps at least part of the penetrating portion, and more preferably overlaps the entire area of the penetrating portion.

Moreover, in the diaper 100 of 1st Embodiment, the sheet | seat 15 for three-dimensional gather formation with which the elastic member 15a was fixed to the inner edge part is arrange | positioned at the both sides of a longitudinal direction, as shown in FIG. The inner edge of the sheet 15 is fixed on the side region S of the composite sheet 10.
With such a configuration, the diaper 100 is curved in the longitudinal direction, and it becomes easier to form a boat shape. The elastic member 15a may not be present in a portion of the inner edge of the sheet 15 that is fixed to the side region S.

From the viewpoint of ensuring that one or more of the effects described above are more reliably exhibited, the central region M of the composite sheet 10 preferably has the following configuration.
The grid-forming first joint row LR1 and the grid-forming second joint row LR2 preferably have an arrangement pitch (distance between center points) P1 of the joints 3 in the joint row that is the shortest distance LL between adjacent joints. Is 1.1 times or more, more preferably 1.5 times or more, preferably 10 times or less, more preferably 5 times or less, and preferably 1.1 times or more and 10 times or less, more preferably It is 1.5 times or more and 5 times or less. Further, the distance between the center lines of the adjacent lattice-formed first joint rows LR1 and the distance between the center lines of the adjacent lattice-formed second joint rows LR2 are each preferably 2 mm or more, more preferably 3 mm or more. Yes, preferably 30 mm or less, more preferably 20 mm or less, preferably 2 mm or more and 30 mm or less, more preferably 3 mm or more and 20 mm or less.

As described above, the convex portion 40 formed in the central region M preferably has a shape in which the low convex portion 42 ′ extends in all directions from the high convex portion 41 ′ portion of the central portion.
Even if the convex part 40 formed in the central region M has such a shape, even if it is bent in the longitudinal direction so that the cross section along the longitudinal direction becomes an arc shape during wearing, the convex part 40 The low convex portion 42b extending in the first direction X corresponding to the article longitudinal direction Xa from the high convex portion 41 ′ is preferentially crushed, and the high convex portion 41 ′ is not easily crushed. Similarly, even when the diaper 100 is bent in the width direction so that the cross section along the width direction becomes an arc shape during wearing, the convex portion 40 of the surface sheet 12 made of the composite sheet 10 is a high convex portion 41. The low convex portion 42a extending in the second direction Y corresponding to the article width direction Yb is preferentially crushed, and the high convex portion 41 ′ is not easily crushed. By such an action, a good touch is obtained in the central region M, and the anti-steaming property is also improved.

  Moreover, the composite sheet 10 in this embodiment is a pair of first low convex portions that extend in one direction in the in-plane direction of the sheet from the high convex portions 41 ′ as four low convex portions 42 constituting the convex portion 40. 42 a and another pair of second low convex portions 42 b extending from the high convex portion 41 ′ in a direction orthogonal to the one direction in the in-plane direction of the sheet, the first low convex portion 42 a The extension length L4 from the high convex portion 41 ′ to the outermost end is longer than that of the second low convex portion 42b. By forming the low convex portion 42 having a different extension length L4 from the high convex portion 41 ′, the surface sheet 12 can be provided with a direction that is relatively easy to bend and a direction that is relatively difficult to bend. By aligning the direction in which the surface sheet 12 is easily bent to the direction in which the absorbent article or the surface sheet is likely to be bent or bent during wearing, the convex and concave portions can be bent flexibly and exhibit good fit and the like. Disposable diapers and the like in which various effects due to the concave and convex shape are stably expressed are obtained.

The extension length L4 of the first low protrusion 42a is the first low in the joint row extending in the direction (first direction X) orthogonal to the extension direction (second direction Y) of the first low protrusion 42a. The length from the middle point on the straight line L3x connecting the centers of two adjacent joints 32 across the convex part 42a to the edge of the joint part 31 closest to the distal end in the extending direction of the first low convex part 42a L4a. The two joint portions 32 that are adjacent to each other with the first low convex portion 42a sandwiched between the first low convex portion 42a and the high convex portion 41 are portions of a recess K (see FIG. 9A). Adjacent joints may be used.
The extension length L4 of the second low convex portion 42b is the second in the joint row extending in the direction (second direction Y) orthogonal to the extension direction (first direction X) of the second low convex portion 42b. From the midpoint on the straight line L3y connecting the centers of two adjacent joints 32 across the low convex part 42b, to the edge of the joint part 33 nearest to the extension direction front part of the second low convex part 42b The length is L4b. The two joint portions 32 adjacent to each other with the second low convex portion 42b interposed therebetween are portions of a depression K (see FIG. 9B) formed at the boundary portion between the second low convex portion 42b and the high convex portion 41. Adjacent joints may be used.

Moreover, in the center area | region M of the composite sheet 100 of 1st Embodiment, a pair of 1st low convex part 42a whose extension length is comparatively long is equivalent to the article width direction Ya from high convex part 41 '. A pair of second low convex portions 42b extending in the second direction Y and having a relatively short extension length extend from the high convex portion 41 ′ in the first direction X corresponding to the article longitudinal direction Xa. . This means that the direction in which bending is likely to occur during wearing coincides with the direction in which the topsheet 12 is easy to bend. Accordingly, the convex and concave portions are not easily crushed and various effects due to the concave and convex shapes are stably expressed while flexibly bending and exhibiting a good fit.
The high convex portion 41 ′ may have a depression K that is recessed toward the inner side of the convex portion 40 as shown in FIG. 9A or 9B at the boundary portion with the low convex portion 42. preferable.
Further, the height H2 of the low convex portion 42 'is preferably 30% or more, more preferably 40% or more, and preferably 80% or less, more preferably 70, of the height H1 of the high convex portion 41'. %, Specifically, preferably 30% or more and 80% or less, more preferably 40% or more and 70% or less.
The height H2 of the low convex portion 42 ′ is obtained by observing the cross section using a digital microscope (manufactured by Keyence), and on the straight line L3x line and the straight line L3y line of the joint line connecting the centers of the joint parts 32 sandwiching the low convex part. At the position of the middle point, the shortest distance from the lower surface of the second sheet 2 to the upper surface of the first sheet 1 is defined as the height.

  Further, the height H1 of the high convex portion 41 ′ is preferably 0.5 mm or more, more preferably 1 mm or more, and preferably 5 mm or less, more preferably 4 mm or less, and specifically preferably 0. .5 mm or more and 5 mm or less, more preferably 1 mm or more and 4 mm or less. Further, the height H2 of the low convex portion 42 is preferably 0.2 mm or more, more preferably 0.4 mm or more, and preferably 3 mm or less, more preferably 2.5 mm or less. Specifically, Preferably they are 0.2 mm or more and 3 mm or less, More preferably, they are 0.4 mm or more and 2.5 mm or less.

  Further, the distance L5 between the recesses 45 facing each other across the high convex portion 41 ′ is the shorter of the length Lx in the first direction X and the length Ly in the second direction Y of the convex portion 40. The length 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. More preferably, it is 60% or more and 110% or less. The length Lx in the first direction X and the length Ly in the second direction Y of the convex portion 40 are each preferably 1 mm or more, more preferably 1.5 mm or more, and preferably 30 mm or less, more preferably 15 mm. Specifically, it is preferably 1 mm or more and 30 mm or less, more preferably 1.5 mm or more and 15 mm or less.

Further, the length along the first direction X of the joint portion 3 (first to third joint portions) is preferably 0.1 mm or more, particularly preferably 0.5 mm or more, and preferably 5 mm or less, particularly 3 mm or less. More specifically, it is preferably from 0.1 mm to 5 mm, particularly preferably from 0.5 mm to 3 mm.
The distance between adjacent joint rows (first to third joint rows) in the first direction is preferably 0.2 mm or more, particularly 0.8 mm or more, and preferably 10 mm or less, particularly 5 mm or less. More specifically, it is preferably from 0.2 mm to 10 mm, particularly preferably from 0.8 mm to 5 mm.

Further, the length along the second direction Y of the joint portion (first to third joint portions) is preferably 0.1 mm or more, particularly preferably 0.5 mm or more, and preferably 5 mm or less, particularly 3 mm or less. More specifically, it is preferably from 0.1 mm to 5 mm, particularly preferably from 0.5 mm to 3 mm.
The distance between adjacent joint rows (first to third joint rows) in the second direction is preferably 0.2 mm or more, particularly 0.8 mm or more, and preferably 10 mm or less, particularly 5 mm or less. More specifically, it is preferably from 0.2 mm to 10 mm, particularly preferably from 0.8 mm to 5 mm.

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

The height H ₁ of the first convex portion 41 is preferably 0.5 mm or more, particularly 1 mm or more, preferably 5 mm or less, particularly 4 mm or less. For example, the height H ₁ of the first convex portion 41 is preferably 0.5 mm or more and 5 mm or less, and more preferably 1 mm or more and 4 mm or less. The height H ₂ of the second convex portion 42 is preferably 0.3 mm or more, particularly preferably 0.6 mm or more, preferably 4 mm or less, provided that the height H ₂ is equal to or lower than the height H ₁ of the first convex portion 41. In particular, it is preferably 3 mm or less. Preferably for example height _{H 2} of the second convex portion 42 is 0.3mm or more 4mm or less, and more preferably 0.6mm or more 3mm or less. The height H ₃ of the third protrusion 43 is preferably 0.2 mm or more, particularly 0.4 mm or more, preferably 3 mm or less, provided that it is lower than the height H ₂ of the second protrusion 42. It is preferable that it is 2.5 mm or less. For example, the height H ₃ of the third convex portion 43 is preferably 0.2 mm or greater and 3 mm or less, and more preferably 0.4 mm or greater and 2.5 mm or less. The height H ₄ of the central convex portion 46 is preferably 0.3 mm or more, particularly 0.6 mm or more, preferably 4 mm or less, particularly 3 mm or less. For example, the height H ₄ of the central convex portion 46 is preferably 0.3 mm or greater and 4 mm or less, and more preferably 0.6 mm or greater and 3 mm or less.

The heights H ₁ , H ₂ , H ₃ , and H ₄ of the convex portions 41, 42, 43, 46 are from the lower surface of the second sheet 2 to the upper surface of the first sheet 1 as shown in FIGS. 3 and 4. Is defined as the distance. The heights H ₁ , H _2, H ₃ , and H ₄ are measured as follows.
[Measurement method of height of convex part]
The sample is cut with a sharp razor, the cut end face is observed, and the shortest distance between the lower surface of the second sheet 2 and the upper surface of each convex portion top is measured. Let the obtained value be the height of each convex part. When it is difficult to measure with the naked eye, the section of the cut sample may be measured by observing at a magnification of 20 to 100 times using, for example, a microscope (VHX-1000 manufactured by KEYENCE). Further, for example, when measuring a diaper sample in a state of being compressed and packed in a package, the surface sheet is peeled off from the diaper, and the value obtained by measuring in the same manner as described above is used for the sample left for one day or more. The height of each convex part is measured under no load.

  For the same reason as that for setting the heights of the convex portions 41, 42, 43, and 46 as described above, the diameter of the first convex portion 41 in a plan view may be 1 mm or more, particularly 2 mm or more. It is preferably 20 mm or less, particularly 10 mm or less. For example, the diameter of the first convex portion 41 is preferably 1 mm or more and 20 mm or less, and more preferably 2 mm or more and 10 mm or less. The diameter of the 2nd convex part 42 is 0.5 mm or more, It is preferable that it is especially 1 mm or more, and it is preferable that it is 15 mm or less, especially 5 mm or less. For example, the diameter of the second convex portion 42 is preferably 0.5 mm or more and 15 mm or less, and more preferably 1 mm or more and 5 mm or less. The diameter of the third convex portion 43 is preferably 0.2 mm or more, particularly 0.5 mm or more, and preferably 10 mm or less, particularly 3 mm or less. For example, the diameter of the third convex portion 43 is preferably 0.2 mm or greater and 10 mm or less, and more preferably 0.5 mm or greater and 3 mm or less. The diameter of the central convex portion 46 is preferably 0.5 mm or more, particularly preferably 1 mm or more, and is preferably 15 mm or less, particularly preferably 5 mm or less. For example, the diameter of the central protrusion 46 is preferably 0.5 mm or more and 15 mm or less, and more preferably 1 mm or more and 5 mm or less.

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

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

  Next, a preferred method for manufacturing the composite sheet 10 having the above-described configuration will be described with reference to FIGS. As shown in FIG. 15, the manufacturing method of the composite sheet 10 includes a first roll 111 having a concavo-convex shape on the peripheral surface, and a concavo-convex shape having a mesh shape with the concavo-convex shape of the first roll on the peripheral surface. While the two rolls 112 are rotated in directions opposite to each other, the first sheet 1 is supplied to the meshing portions of the two rolls 111 and 112 to form the first sheet 1 with irregularities. Further, in the manufacturing method of the composite sheet 10, after the shaping step, the first sheet 1 is held as it is along the peripheral surface portion of the first roll 111 and moved from the meshing portion, and then the second sheet 2 is moved to the first sheet 1. The two sheets 1 and 2 are supplied so as to be superimposed on the sheet 1 and are partially joined by being sandwiched between the convex portion of the first roll 111 and the first heat roll 113 and the second heat roll 114 under heating. A joining step to be performed.

  As shown in FIG. 15, the second roll 112, the first heat roll 113, and the second heat roll 114 are disposed to face the peripheral surface of the first roll 111. The second roll 112, the first heat roll 113, and the second heat roll 114 are arranged in that order from the upstream side in the rotation direction R of the first roll 111 toward the downstream side. Details of the first roll 111 and the second roll 112 whose peripheral surfaces are uneven are described later. The 1st heat roll 113 and the 2nd heat roll 114 are flat anvil rolls which do not have unevenness in a peripheral surface, respectively.

  First, the first sheet 1 is fed out from a raw roll (not shown) of the first sheet 1. Separately from this, the second sheet 2 is fed out from a raw roll (not shown) of the second sheet 2. And as shown in FIG. 15, the 1st sheet | seat 1 let | drawn out is made to mesh | engage in the meshing part of the 1st roll 111 and the 2nd roll 112, and the 1st sheet | seat 1 is unevenly shaped. At this time, the 1st roll 111 is attracted | sucked toward the inside of a roll from the surrounding surface, and the uneven | corrugated shaping of the 1st sheet | seat 1 is promoted. The suction mechanism in the first roll 111 will be described later.

  Next, as shown in FIG. 15, the first sheet 1 is continuously sucked to the peripheral surface of the first roll 111 to keep the shaping state, and the second sheet 2 is overlapped, and the overlapped one is the first roll. A pressure is applied between 111 and the first heat roll 113 having a smooth circumferential surface. At this time, both the first roll 111 and the first heat roll 113 or only the first heat roll 113 are 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 roll 111, that is, on the tooth tip surface of each gear (described later with reference to FIG. 16), are joined by thermal fusion. Thus, the joint portions 31 to 33 are formed.

  Next, the superposed body of the first sheet 1 and the second sheet 2 joined by heat fusion is moved under the state of being continuously sucked and held on the peripheral surface of the first roll 111, and the superposed body is moved to the first A pressure is applied between the roll 111 and the second heat roll 114 having a smooth circumferential surface. At this time, both the first roll 111 and the second heat roll 114 or only the second heat roll 114 are heated to a predetermined temperature. As a result, the material constituting the first sheet 1 and the second sheet 2 at the joints 31 to 33 located on the convex portions of the first roll 111, that is, on the teeth of each gear, for example, thermoplastic resin. Is melted, and the joint portions 31 to 33 are formed more firmly. In this way, the target composite sheet 10 is continuously manufactured.

  In the manufacture of the composite sheet 10 described above, the first roll 111 and the second roll 112 have a central region forming portion that forms the above-described central region M in the composite sheet 10 at the central portion in the axial length direction, The composite sheet 10 provided with the side region forming portions for forming the side regions S, S described above is used on both sides of the central portion in the axial direction.

  FIG. 16 is a perspective view of the first roll 111 shown in FIG. 15 with the central region forming portion disassembled. FIG. 17 is a perspective view showing a state in which the side region forming portion of the first roll 111 shown in FIG. 15 is disassembled. The first roll 111 is a combination of a plurality of first gears 121, second gears 122, and spacers 123 that are concentrically attached to the shaft core 124 and integrated in a roll shape. In the first roll 111, the tooth pitch of the first gear 121 and the second gear 122, the arrangement order of the gears 121, 122 and the spacer 123 are different between the central region forming portion and the side region forming portion. In any of the central region forming portion and the side region forming portion, the two types of gears 121 and 122 and the spacer 123 have their shaft centers opened, and a rotating shaft (not shown) is inserted into the openings. Each of the two types of gears 121 and 122 and the spacer 123 has a notch (not shown), and a key (not shown) is inserted into the notch. As a result, the idle rotation of the two types of gears 121 and 122 and the spacer 123 is prevented.

  The spacer 123 has a shape having a beam 125 that is a large number of protrusions extending radially from the center. Each beam 125 in the spacer 123 has the same length. If the diameter of a circle virtually formed by connecting the tips of the beams 125 is defined as the tip circle diameter for convenience, the tip circle diameter is the root circle of the first and second gears 121 and 122. It is smaller than the diameter.

  A plurality of openings 126 and 127 are formed in the gears 121 and 122 so as to surround a central opening into which a rotation shaft (not shown) is inserted. 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 almost equal. The number of openings 126 and 127 in each gear 121 and 122 is the same as the number of beams 125 in the spacer 123 described above. 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 positioned between the adjacent beams 125 in the spacer 123, respectively. . That is, the openings 126 and 127 are positioned in a substantially V-shaped region constituted by two adjacent beams 125 and the central portion of the spacer 123. In FIG. 16, the entire openings 126 and 127 are included in the substantially V-shaped region. Instead, only a part of the openings 126 and 127 is included in the approximately V-shaped region. It may be included. This substantially V-shaped portion corresponds to a concave portion in the first roll 111 whose peripheral surface has an uneven shape. On the other hand, the concavo-convex convex portions correspond to the tooth tips and 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 to the axial direction of the first roll 111, A plurality of suction paths (not shown) extending in the direction are formed inside the first roll 111. By connecting this suction path to a suction device installed outside the roll 111 and operating the suction device, the first roll 111 can be sucked inward from the recess formed on the peripheral surface thereof. become.

FIG. 18 shows a state in which the peripheral surface of the central region forming portion of the first roll 111 is developed on a plane. In the figure, the direction indicated by the arrow U is the rotation direction of the first roll 111, and the direction indicated by the arrow V is the axial direction of the first roll 111. Further, in the figure, rectangular regions indicated by fine dots indicate the tooth tip surfaces of the gears 121 and 122. As shown in the figure, the central region forming portion of the first roll 111 includes 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. The members are integrated in this order to form one cycle T ₁ and have an integrated structure in which this cycle T ₁ is repeated.

  In FIG. 18, the tooth tip surface indicated by fine dots is a position where the joint portions 31 to 33 are to be formed in the target composite sheet 10. Specifically, the tooth tip surface of the tooth 121 a of the first gear 121 is a position where the first joint portion 31 or the third joint portion 33 is to be formed. Further, the tooth tip surface of the tooth 122 a of the second gear 122 is a position where the second joint portion 32 is to be formed. The gears 121 and 122 and the spacer 123 are appropriately arranged so as to obtain the arrangement pattern of the joint portions 31 to 33 as shown in FIG. 4 described above.

  Further, in FIG. 18, the first roll recess area 140 </ b> A is a position where the projection 40 is to be formed in the target composite sheet 10, and the first roll third recess area 143 </ b> A is the third protrusion in the target composite sheet 10. This is a position where the portion 43 is to be formed.

FIG. 19 shows a state in which the peripheral surface of the second roll 112 that is meshed with the central region forming portion of the first roll 111 is developed on a plane. In the figure, the direction indicated by the arrow U is the rotation direction of the second roll 112, and the direction indicated by the arrow V is the axial direction of the second roll 112.
As shown in FIG. 19, the central region forming portion of the second roll 112 is constituted by an integrated body including a third gear 131 and a fourth gear 132. In the figure, rectangular areas indicated by coarse dots indicate the tooth tip surfaces of the gears 131 and 132. The second roll 112 may not have a suction mechanism. Therefore, it is unnecessary to form the openings 126 and 127 formed in the first gear 121 and the second gear 122 of the first roll 111 in the gear of the second roll 112.

As shown in FIG. 19, the central region forming portion of the second roll 112 includes four members of the third gear 131, the fourth gear 132, the third gear 131, and the fourth gear 132 that are integrated in this order for one cycle. None of T _2, the period T ₂ has a repeated formed by integrated structure.

  In FIG. 19, the second roll convex portion 140 </ b> B is formed by the teeth 131 a of the third gear 131 and the teeth 132 a of the two fourth gears 132 adjacent to both sides thereof. In a state where the first roll 111 and the second roll 112 are engaged with each other, the second roll convex portion 140B is fitted to the first roll concave portion 140A.

  FIG. 20 shows a state where the peripheral surface of the first roll 111 and the convex portion of the second roll 112 mesh with each other are developed on a plane. In the same figure, rectangular areas indicated by fine dots indicate the tooth tip surfaces of the gears 121 and 122 in the first roll 111. In addition, a rectangular area indicated by coarse dots indicates the tooth tip surfaces of the gears 131 and 132 in the second roll 112. As is clear from the drawing, the second roll convex portion 140B enters the first roll concave portion 140A. In contrast, the convex portion of the second roll 112 does not enter the first roll third concave portion 143A.

FIG. 21 shows a state in which the peripheral surface of the side region forming portion of the first roll 111 is developed on a plane. In the figure, the direction indicated by the arrow U is the rotation direction of the first roll 111, and the direction indicated by the arrow V is the axial direction of the first roll 111. Further, in the figure, rectangular regions indicated by fine dots indicate the tooth tip surfaces of the gears 121 and 122. As shown in the drawing, the side region forming portion of the first roll 111 includes 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, and the spacer 123. , the first gear 121, second gear 122, the 12 members of the spacer 123 and the second gear 122 forms the one period _{T 1} are integrated in this order, have a integrated structure which the period _{T 1} is formed by repeated doing.

  In FIG. 21, the tooth tip surfaces indicated by fine dots are the planned formation positions of the joint portions 31 and 32 of the side region S in the target composite sheet 10. Specifically, the tooth tip surface of the tooth 121 a of the first gear 121 is a position where the second joint portion 32 is to be formed. Further, the tooth tip surface of the tooth 122 a of the second gear 122 is a position where the first joint portion 31 is to be formed. The gears 121 and 122 and the spacer 123 are appropriately arranged so as to obtain the arrangement pattern of the joint portions 31 and 32 as shown in FIG.

  Further, in FIG. 21, the first roll central concave region 146A surrounded by the four teeth 121a of the first gear 121 and the two teeth 122a of the second gear 122 is formed as the central convex portion 46 in the target composite sheet 10. The planned position. The first roll first recess area 141A surrounded by one tooth 122a and two teeth 121a arranged along the U direction at a distance in the V direction is a target composite sheet. This is the formation planned position of the first convex portion 41 in the ten side regions S. Furthermore, the first roll second recess region 142A surrounded by the four teeth 121a is a formation planned position of the second projection 42 in the side region S of the target composite sheet 10. Furthermore, the first roll third recess region 143A between the two teeth 121a arranged at a distance in the V direction across the spacer 123 is the third protrusion in the side region S of the target composite sheet 10. This is a position where the portion 43 is to be formed.

  FIG. 22 shows a state in which the peripheral surface of the second roll 112 that is meshed with the side region forming portion of the first roll 111 is developed on a plane. In the figure, the direction indicated by the arrow U is the rotation direction of the second roll 112, and the direction indicated by the arrow V is the axial direction of the second roll 112. Moreover, the rectangular area | region shown with the rough dot in the same figure has shown the tooth tip surface of the gearwheels 124 and 122. FIG.

As shown in FIG. 22, the side region forming portion of the second roll 112 includes the third gear 124, the spacer 123, the second gear 122, the second gear 122, the spacer 123, the third gear 124, the spacer 123, and the second gear 122. , second gear 122, no ten members one period T ₂ is integrated in this order of spacer 123, the period T ₂ has a repeated formed by integrated structure. The total thickness of the 10 members forming the cycle T ₂ is the same as the total thickness of the 12 members forming the cycle T ₁ in the first roll 111.

  In FIG. 22, the second roll center convex portion 146 </ b> B and the second roll second convex portion 142 </ b> B are formed by the teeth 124 a of the third gear 124. The 2nd roll center convex part 146B and the 2nd roll 2nd convex part 142B are located alternately along the U direction. The second roll first convex portion 141 </ b> B is formed by the teeth 122 a of the second gear 122. In a state in which the first roll 111 and the second roll 112 are engaged with each other, the second roll first convex portion 141B is fitted to the first roll first concave portion region 141A. Moreover, the 2nd roll 2nd convex part 142B fits with the 1st roll 2nd recessed part area | region 142A. Further, the second roll center convex portion 146B fits with the first roll center concave region 146A.

  FIG. 23 shows a state in which a state in which the convex portion of the second roll 112 is engaged with the peripheral surface of the side region forming portion of the first roll 111 is developed on a plane. In the same figure, rectangular areas indicated by fine dots indicate the tooth tip surfaces of the gears 121 and 122 in the first roll 111. In addition, a rectangular region indicated by coarse dots indicates the tooth tip surfaces of the gears 124 and 122 in the second roll 112. As is apparent from the drawing, the second roll first convex portion 41B enters the first roll first concave region 141A. The second roll second convex portion 142B enters the first roll second concave portion 142A. Further, the second roll center convex portion 146B enters the first roll center concave region 146A. In contrast, the convex portion of the second roll 112 does not enter the first roll third concave portion 143A.

And in the center area | region formation part, the 1st sheet | seat 1 (not shown) is 1st in the 1st roll 111 and the 2nd roll 112 because the 2nd roll convex part 140B enters into the 1st roll recessed area 140A. Solid shaping corresponding to the convex portion 40 is performed by being pushed into the roll 111.
Moreover, the 1st roll 111 and the 2nd roll 112 are the 1st sheet | seat 1 (not shown) in the side area | region formation part because the 2nd roll 1st convex part 141B enters into the 1st roll 1st recessed part area | region 141A. 3) is pushed into the first roll 111, and the three-dimensional shaping corresponding to the first convex portion 41 is performed. Further, the second roll second convex portion 142B enters the first roll second concave portion 142A, so that the first sheet 1 (not shown) is pushed into the first roll 111 and becomes the second convex portion 42. Corresponding solid shaping is performed. Moreover, the 1st sheet | seat 1 (not shown) is pushed in in the 1st roll 111 by the 2nd roll center convex part 146B entering the 1st roll center recessed area 146A, and it respond | corresponds to the center convex part 46. FIG. Three-dimensional shaping is performed. In the first roll third recess area 143A, suction from the third recess area 143A toward the inside of the first roll 111 causes the first sheet 1 (not shown) to move into the third recess area 143A. Three-dimensional shaping is performed by suction.
Then, the target composite sheet 10 is obtained by bonding the second sheet 2 to the first sheet 1 subjected to the three-dimensional shaping.

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

Next, the disposable diaper of 2nd Embodiment is demonstrated. The composite sheet 10A constituting the top sheet in the disposable diaper of the second embodiment has the same configuration of the central region M as that of the composite sheet 10 used in the first embodiment, but the configurations of the side regions S and S are different. ing.
In the second embodiment, differences from the above-described first embodiment will be mainly described, and description of similar points will be omitted. For the points that are not particularly described, the description in the first embodiment is applied as appropriate.

  In the composite sheet 10A used as the top sheet in the second embodiment, as shown in FIG. 27, the first sheet 1 and the second sheet 2 that are laminated are partially joined. A vertically long joining portion 31 having a vertically long shape whose length L3 along the first direction X is longer than the length L1 along the second direction Y is formed. Each of the vertically long joint portions 31 has 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 10 </ b> A, all the joint portions are the vertically long joint portions 31. Also, in the composite sheet 10A, as shown in FIG. 26, the second direction joint row R in which the vertically long joint portions 31 are regularly arranged along the second direction Y at two kinds of intervals L2 and L4 is provided. A plurality of rows are formed in one direction X. More specifically, the second direction joint line R includes a first distance L2 and a second distance L4 wider than the first distance L2 as the distance between the vertically long joints 31 in the second direction Y. The plurality of vertically long joint portions 31 in the second direction joint portion row R are intermittently arranged in the second direction Y so as to have these two types of intervals alternately in the second direction Y.

  The vertically long joint portions 31 constituting the individual second direction joint row R have the same length and arrangement position in the first direction X, and are adjacent to each other in the first direction X between the second direction joint rows R. A gap having a constant width W is formed. In addition, the second direction joint portion rows R formed in a plurality of rows in the first direction X have the arrangement positions of the vertically long joint portions 31 in the second direction Y aligned every other row, and adjacent second direction joints. The arrangement positions of the vertically long joint portions 31 in the second direction Y are different from each other between the partial rows R. In detail, as shown in FIG. 27, as the second direction joint row R, the second direction first joint row R1 and the second direction second are different in the arrangement positions of the vertically long joint portions 31 in the second direction. The joint rows R2 are alternately formed in the first direction X, and the arrangement positions of the vertically long joint portions 31 in the second direction Y are the second direction first joint row R1 and the second direction second joint. The part rows R2 are adjacent to each other at the first interval L2 in the other junction row R2 (R1) between the vertically long junction portions 31 adjacent at the second interval L4 in one of the junction row R1 (R2). A pair of matching vertically long joint portions 31 are located.

  As shown in FIG. 27, the convex portion 41 is formed in a region surrounded by a total of six joint portions 31 including two vertically long joint portions 31, 31 adjacent in the second direction joint portion row R. ing. The total of six joint portions 31 in the side region S of the composite sheet 10A are all vertically long joint portions 31. Specifically, as shown in FIG. 27, the second direction first joint portion row R1 is 2 Of the four vertically long joints 31 constituting the two second direction second joint rows R2 and R2 adjacent to the first longitudinal joint 31 and the second direction first joint row R1 in the first direction X. A total of six vertically long joint portions 31 are surrounded. Further, in the side region S of the composite sheet 10A, a pair of vertically long joint portions including a pair of vertically long joint portions 31 that are arranged close to each second direction joint row R in the second direction Y at the first interval L2. 30 is intermittently arranged in the second direction Y at an interval L4 that is twice or more the first interval L2, and the convex portion 41 is formed between the pair of vertically long joint portions 30 and 30 adjacent in the second direction Y. Has been. The pair of vertically long joints 30 in the present embodiment includes a pair of vertically long joints 31 that are adjacent to each other at the narrowest distance L2 in the second direction joint line R.

  As shown in FIGS. 25 and 26, the convex portions 41 are formed in the side region S of the composite sheet 10A in a state of being dispersed in the in-plane direction of the composite sheet 10A. The convex portions 41 are arranged in a staggered manner. More specifically, as shown in FIG. 26, the convex portion 41 includes a first direction convex portion row 4X in which a plurality of convex portions 41 are arranged in series along the first direction X at regular intervals, and a plurality of convex portions 41. Are arranged in the second direction Y at a constant interval, and the plurality of convex portions 41 are inclined with respect to both the first direction X and the second direction Y at a constant interval. It arrange | positions so that it may have 3rd direction convex part row | line | column 4XY in series along the 3rd direction. Also, the second direction convex portion rows 4Y adjacent in the first direction X have the arrangement positions of the convex portions 41 shifted by a half pitch in the second direction Y, and the first direction convex portions adjacent in the second direction Y. In the columns 4X, the arrangement positions of the convex portions 41 are shifted by a half pitch in the first direction X. The half pitch here is a center-to-center distance between adjacent convex portions 41 in each of the first direction X and the second direction Y.

Each convex part 41 formed in the side region S of the composite sheet 10A has a circular or elliptical shape in plan view as shown in FIGS. 26, 28 (a) and 28 (b), and is formed on the back side. It has a hollow portion 41V. The convex portion 41 forms a top portion in the central portion of the region surrounded by the six vertically long joint portions 31.
Further, in the side region S of the composite sheet 10A, as shown in FIG. 27, the height between the vertically long joint portions 31, 31 adjacent to each other at a narrow interval L2 in the second direction convex portion row R is lower than the convex portion 41. A second convex portion 42 is formed, and a third convex portion 43 having a height lower than that of the convex portion 41 is formed between the closest joint portions 31 in the second direction convex portion row R adjacent in the first direction X. Has been. Between the convex part 41 and the other convex part 41 adjacent, the cyclic | annular recessed part which consists of six junction parts surrounding the convex part 41, and the 2nd convex part 42 and the convex part 43 which are located between those junction parts Separated by The second convex portion 42 and the third convex portion 43 are literally “convex portions”, but both the second convex portion 42 and the third convex portion 43 are relatively lower in height than the convex portion 41. As seen from these convex portions 41, they are relatively concave portions.

  FIG. 29 is a view corresponding to FIG. 23 of the side region forming portion of the first roll and the second roll used for manufacturing the composite sheet 10A. In the 1st roll and 2nd roll side area | region formation part used for manufacture of composite sheet | seat 10A, the 1st sheet | seat 1 (not shown) is obtained by the 2nd roll convex part 141B entering the 1st roll recessed part area | region 141A. Solid shaping corresponding to the convex part 41 is performed by being pushed into the first roll 111. On the other hand, in the first roll second recess area 142A and the first roll third recess area 143A, the first sheet is sucked from the second recess area 142A and the third recess area 143A toward the inside of the first roll 111. 1 (not shown) is sucked into the second concave region 142A and the third concave region 143A, and the three-dimensional shaping corresponding to the second convex portion 42 and the third convex portion 43 is performed. Then, the target composite sheet 10A is obtained by bonding the second sheet 2 to the first sheet 1 subjected to the three-dimensional shaping.

Also in the composite sheet 10 </ b> A, since the joint portion is formed in a different pattern in the central region M and the pair of side regions S, S, the area ratio of the joint portion 31 in the side region S is equal to the joint portion in the central region M. It is higher than the area ratio of 3.
Therefore, the effect similar to the diaper 100 of 1st Embodiment is acquired also by the diaper of 2nd Embodiment using 10 A of composite sheets as a surface sheet.
Regarding the composite sheet 10A, the difference (Es−Em, percentage point) between the area ratio Es (%) of the joint in the side region S and the area ratio Em (%) of the joint in the central region M, the joint in the central region M Area ratio Em, the area ratio Es of the joint portion in the side region S, the bending rigidity of the side region S and the central region M, the joint portion 31 of the side region S which is a vertically long joint portion, and the joint portion 3 in the central region M Regarding the ratio of the length in the first direction X, etc., the preferred range is the same as that of the composite sheet 10 of the first embodiment.

Next, the disposable diaper of 3rd Embodiment is demonstrated. Also in the composite sheet 10B constituting the top sheet in the disposable diaper of the third embodiment, as shown in FIG. 30, the shape and arrangement pattern of the protrusions in the central region M are the shape of the protrusions in the side regions S and S and It is different from the arrangement pattern.
In the third embodiment, differences from the first embodiment described above will be mainly described, and description of similar points will be omitted. For the points that are not particularly described, the description in the first embodiment is applied as appropriate.

  As shown in FIG. 31, in the central region M of the composite sheet 10B, similarly to the central region M of the composite sheet 10 described above, the stacked first sheet 1 and second sheet 2 are partially joined to each other. The first sheet 1 protrudes in a direction away from the second sheet 2 at a portion other than the bonding part 34 and protrudes toward the wearer's skin side. A convex portion 40C is formed. In the central region M of the composite sheet 10B, a plurality of joints 34 are formed by a plurality of lattice-formed first joint rows in which a plurality of joints 34 are arranged in a row at a constant pitch along the first direction X. Are formed in a grid-like arrangement pattern composed of a plurality of grid-formed second joint rows arranged in a line at a constant pitch along the second direction Y, and the eight joints A convex portion 40 </ b> C having a substantially cross shape in plan view is formed at each of the locations corresponding to the eyes of the lattice surrounded by 34. Similar to the convex portion 40 of the composite sheet 10 described above, the convex portion 40C has a high convex portion 41 ′ having a hollow portion on the back surface side and forming the top of the convex portion 40C, and the periphery of the high convex portion 41 ′. Furthermore, it is comprised from four low convex part 42 'formed in the state connected with this high convex part 41'. When the composite sheet 10B shown in FIG. 30 is used, for example, as the top sheet of the disposable diaper 100 described above with the first direction X aligned with the article longitudinal direction Xa, the four sheets around the high convex portion 41 ′ are used. The low convex portion 42 ′ extends in an oblique direction with respect to each of the article longitudinal direction Xa and the article width direction Ya.

  As shown in FIG. 32, the side region S of the composite sheet 10B has a shape that is long in the first direction X as a joint formed by partially joining the laminated first sheet 1 and second sheet 2. The first rectangular joint portion 31 and the length in the second direction Y are the same as those of the first joint portion 31, but the first length in the square direction is shorter than the first joint portion in the first direction X. 2 joint portions 32 are formed. In the side region S of the composite sheet 10B, a central continuous convex portion 40 extending continuously in the second direction Y is formed as a convex portion formed by protruding the first sheet 2 in the direction away from the second sheet 2. A plurality of lines are formed in the direction X with a certain distance. Each of the central continuous convex portions 40 is formed by connecting first convex portions 41 and second convex portions 42 alternately arranged in the second direction Y. The 1st convex part 41 and the 2nd convex part 42 which comprise the center continuous convex part 40 have a hollow part in each back side, The hollow part of the back surface of the 1st convex part 41, and the back surface of the 2nd convex part 42 A continuous hollow portion continuously extending along the second direction Y is formed on the back side of the central continuous convex portion 40 continuously with the hollow portion. In the side region S of the composite sheet 10B, a non-embossed region N that extends in the second direction Y and does not have a joint portion continuously in the second direction, and extends in the second direction, the joint portions are regular. Embossed regions E formed in a simple pattern are alternately formed in the first direction X. In the embossed region E, an in-embossed region convex portion 46 ′ is formed so as to be surrounded by the two first joint portions 31 and the four second joint portions 32.

Also in the composite sheet 10 </ b> B, since the joint portions are formed in different patterns in the central region M and the pair of side regions S, S, the area ratios of the joint portions 31, 32 in the side region S are in the central region M. The area ratio of the junction 34 is higher.
Therefore, the effect similar to the diaper 100 of 1st Embodiment is acquired also by the diaper of 3rd Embodiment using the composite sheet 10B as a surface sheet.
Regarding the composite sheet 10B and the composite sheet 10C described later, the difference (Es−Em, percentage point) 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, The area ratio Em of the joint portion in the central region M, the area ratio Es of the joint portion in the side region S, the bending rigidity of the side region S and the central region M, the joint portion 31 of the side region S that is a vertically long joint portion, and the central region M Regarding the ratio of the length in the first direction X with respect to the joint portion 3 and the like, a preferable range is the same as that of the composite sheet 10 of the first embodiment.

Next, the disposable diaper of 4th Embodiment is demonstrated. Also in the composite sheet 10C constituting the top sheet in the disposable diaper of the fourth embodiment, as shown in FIG. 33, the shape and arrangement pattern of the protrusions in the central region M are the shape of the protrusions in the side regions S and S and It is different from the arrangement pattern.
In the fourth embodiment, differences from the above-described first embodiment will be mainly described, and description of similar points will be omitted. For the points that are not particularly described, the description in the first embodiment is applied as appropriate.

FIG. 34 shows an enlarged plan view of the vicinity of the boundary between the central region M and the side region S of the composite sheet 10C shown in FIG. 35 (a) to 35 (c) are cross-sectional views of the composite sheet 10C in the central region M, and are a cross-sectional view taken along the line Va-Va, a cross-sectional view taken along the line Vb-Vb, and a cross-sectional view taken along the line Vc-Vc in FIG. It is shown.
As shown in FIGS. 33 to 35, a plurality of joint portions 331 and 332 in which the laminated first sheet 1 and second sheet 2 are partially joined are formed in the central region M of the composite sheet 10C. Yes. Moreover, the 1st sheet | seat 1 protrudes in the direction which leaves | separates from the 2nd sheet | seat 2 in site | parts other than those junction parts, and thereby, center continuous convex part 40M as a convex part which protrudes toward a wearer's skin side. And the 3rd convex part 343 and the 4th convex part 344 are formed.
The central continuous convex portions 40M extend in the second direction Y, and a plurality of central continuous convex portions 40M are formed at intervals in the first direction X. The 3rd convex part 343 is formed in the shape of a dot at intervals in the 1st direction X and the 2nd direction Y. The fourth convex portion 344 is formed between the central continuous convex portion 40M and the third convex portion 343.

As shown in FIGS. 34 and 35A, each central continuous convex portion 40M is formed by connecting first convex portions 341 and second convex portions 342 that are alternately arranged in the second direction Y to each other. Has been. The 1st convex part 341 and the 2nd convex part 342 which comprise the center continuous convex part 40M have a hollow part in each back side. In the central continuous convex portion 40M, the hollow portion on the back surface of the first convex portion 341 and the hollow portion on the back surface of the second convex portion 342 are continuous, along the second direction Y on the back side of the central continuous convex portion 40M. It is preferable that a continuous hollow portion 40V extending continuously is formed. As for the 3rd convex part 343, it is preferred that hollow part 43V is formed in the back side.
The first convex part 341 and the second convex part 342 constituting the central continuous convex part 40M are both elliptical in plan view, but the first convex part 341 has the major axis of the ellipse in the first direction. X coincides with X, and the long axis of the second convex portion 342 coincides with the second direction Y. Moreover, it is preferable that the 1st convex part 341, the 2nd convex part 342, and the 3rd convex part 343 are the shapes in which the cross section along the 1st direction X has a top part, respectively, and is the 1st direction X and 2nd direction. In any cross section of Y, a shape having a top is more preferable. The upper surface of the fourth convex portion 344 is substantially flat, but protrudes from the upper surfaces of the two second joint portions 332 sandwiching the fourth convex portion 344.

  In the central region M of the composite sheet 10C, a first joint portion 331 arranged at a predetermined interval in the first direction X, preferably at a constant interval, and a narrower interval than the first joint portion 331 in the first direction X. A second joint portion 332 is formed with a gap therebetween. The first joint portion 331 and the second joint portion 332 are formed in multiple rows in the second direction Y. As shown in FIG. 34, the first joint portion 331 is formed in the central region M of the composite sheet 10C. A plurality of vertical first joint rows R3x that are serially arranged along one direction X and a plurality of horizontal first joint rows R3y that are serially arranged along the second direction Y are the first vertical joint rows R3x. In addition, a vertical second joint row R4x in which the second joint portions 332 are serially arranged along the first direction X, and a horizontal second joint row in which the second joint portions 332 are serially arranged in the second direction Y R4y is formed in a plurality of rows.

  In the central region M of the composite sheet 10C, an embossed region E in which the lateral first joint row R3y is interposed between two adjacent lateral second joint rows R4y, and the adjacent lateral second Non-embossed regions N, which are regions between the joint row R4y and do not include the joint portions 331 and 332, are alternately formed in the first direction X, and each central continuous convex portion 40M is The first direction central portion extending in the second direction Y is formed so as to be located in the first direction central portion of the non-embossed region N. In the 1st junction part 331 and the 2nd junction part 332, the 1st sheet | seat 1 and the 2nd sheet | seat 2 are integrally pressurized by embossing, and both sheets are high compared with another part. It is densified, and the two sheets are preferably thermally fused by melting and subsequent solidification of the constituent resin of one or both sheets.

  The central continuous convex portion 40M extends continuously in the second direction Y and has a portion whose width is regularly narrowed 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 the pair of first joint portions 331 facing each other across the non-embossed region N, and the non-embossed region N A second convex portion 42 of the central continuous convex portion 40M is formed in a region surrounded by a total of four second joint portions 332 composed of two pairs of second joint portions 332 opposed to each other. Regarding the length in the direction along the direction X, the length L42 of the second convex portion 342 is shorter than the length L41 of the first convex portion 341. The central continuous convex portion 40M is a constricted portion whose width (length in the first direction X) is narrower than the portion formed of the second convex portion 342.

  In the central region M of the composite sheet 10C shown in FIG. 34, there are two vertical second joint rows R4x between the vertical first joint rows R3x adjacent in the second direction Y. In the two directions Y, the vertical first joint rows R3x and the vertical second joint rows R4x may be alternately arranged one by one. Including the case, the length of the first joint portion 331 in the first direction X is preferably equal to or longer than the length of the second joint portion 332 in the first direction X, and in the second direction Y The length of the first joint portion 331 is preferably the same as or longer than the length of the second joint portion 332 in the second direction Y.

  As shown in FIGS. 33, 34, and 36, the side region S of the composite sheet 10 </ b> C has a plurality of joint portions 231 and 232 in which the laminated first sheet 1 and second sheet 2 are partially joined. Is formed. Moreover, the 1st sheet | seat 1 protrudes in the direction which leaves | separates from the 2nd sheet | seat 2 in site | parts other than those junction parts, thereby, side continuous convex part 40S as a convex part which protrudes toward a wearer's skin side. And the 3rd convex part 243, the 4th convex part 244, and the 5th convex part 245 are formed. The side continuous convex portions 40 </ b> S each extend in the second direction Y, and a plurality of side continuous convex portions 40 </ b> S are formed at intervals in the first direction X. The 3rd convex part 243 is formed in the shape of a dot at intervals in the 1st direction X and the 2nd 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 joint portions 231 adjacent in the second direction Y. Has been.

As shown in FIGS. 34 and 36A, 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. Has been. The 1st convex part 241 and the 2nd convex part 242 which comprise the side continuous convex part 40S have a hollow part in each back side. In the side continuous convex portion 40S, the hollow portion on the back surface of the first convex portion 241 and the hollow portion on the back surface of the second convex portion 242 are continuous, along the second direction Y on the back side of the side continuous convex portion 40S. It is preferable that a continuous hollow portion 40V extending continuously is formed. It is preferable that the third convex portion 243 also has a hollow portion 43V formed on the back side thereof. The first convex portion 241 and the second convex portion 242 constituting the side continuous convex portion 40S are both in a plan view. Although it has an elliptical shape, the first convex portion 241 and the second convex portion 242 both have the major axis of the ellipse coincident with the first direction X. Each of the first to third convex portions 241 to 243 of the side continuous convex portion 40S may have a circular shape in plan view. Moreover, it is preferable that the 1st convex part 241, the 2nd convex part 242, and the 3rd convex part 243 respectively have the shape where the cross section along the 1st direction X has a top part, and the 1st direction X and the 2nd direction In any cross section of Y, a shape having a top is more preferable. The upper surface of the fourth convex portion 244 protrudes from the upper surface of each of the two second joint portions 232 sandwiching the fourth convex portion 244, and the upper surface of the fifth convex portion 245 differs from the fifth convex portion 245. It protrudes from the upper surface of each of the two first joint portions 231 sandwiched.

  Also in the side region S of the composite sheet 10C, the first joints 231 arranged in the first direction X at a predetermined interval, preferably a constant interval, and the first joints 231 in the first direction X at a narrower interval than the first joints 231. A second joint portion 232 is formed with a space therebetween. Further, as shown in FIG. 34, in the side region S of the composite sheet 10C, the first joint portion row R5x in which the first joint portions 231 are arranged in series along the first direction X, and the first joint portion 231 are provided. A plurality of lateral first joint rows R65y in series along the second direction Y are formed, and a second vertical joint in which the second joint 232 is in series along the first direction X. A plurality of rows R6x and a plurality of transverse second joint rows R6y in which the second joints 332 are arranged in series along the second direction Y are formed.

  Also in the side region S of the composite sheet 10C, the side embossed region SE in which the lateral first joint row R5y is interposed between two adjacent lateral second joint rows R6y and the adjacent lateral second The side non-embossed regions SN that are regions between the two joint rows R6y and do not include the joints 231 and 232 are alternately formed in the first direction X, and each side continuous convex portion 40S is formed so that the first direction central portion extending in the second direction Y is located in the first direction central portion of the side non-embossed region SN. In the 1st junction part 231 and the 2nd junction part 232, the 1st sheet | seat 1 and the 2nd sheet | seat 2 are integrally pressurized by embossing, and both sheets are high compared with another part. It is densified, and the two sheets are preferably thermally fused by melting and subsequent solidification of the constituent resin of one or both sheets.

  As with the central continuous convex portion 40M, the side continuous convex portion 40S also has a portion that extends continuously in the second direction Y and is regularly narrowed in the second direction Y, as shown in FIG. Yes. The length of the first joint portion 231 in the first direction X is preferably equal to or longer than the length of the second joint portion 232 in the first direction X, and the length of the first joint portion 231 in the second direction Y is preferable. The length is preferably the same as or longer than the length of the second joint portion 232 in the second direction Y.

In the central region M of the composite sheet 10C, the fourth convex portion 344 is lower in height than any of the first convex portion 341, the second convex portion 342, and the third convex portion 343.
Further, when the height of the first convex portion 341 is H1, the height of the second convex portion 342 is H2, the height of the third convex portion 343 is H3, and the height of the fourth convex portion 344 is H4. Satisfies 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 fourth convex portion 244 and the fifth convex portion 45 are lower in height than any of the first convex portion 241, the second convex portion 242, and the third convex portion 243. Yes. Further, the height of the first convex portion 241 is H1, the height of the second convex portion 242 is H2, the height of the third convex portion 243 is H3, the height of the fourth convex portion 244 is H4, and the fifth convex portion. When the height of 245 is H5, these satisfy the following relationships (1) to (3).
(1) H1 ≧ H3
(2) H3 ≧ H2
(3) H2> H4 and H2> H5

Also in the composite sheet 10 </ b> C, since the joint portions are formed in different patterns in the central region M and the pair of side regions S and S, the area ratio of the joint portions 231 and 232 in the side region S is It is higher than the area ratio of the joint portions 331 and 332.
Therefore, the effect similar to the diaper 100 of 1st Embodiment is acquired also by the diaper of 3rd Embodiment using the composite sheet 10B as a surface sheet.

Further, in the composite sheet 10C, as shown in FIGS. 33 and 34, the first convex portion 341 which is the convex portion having the maximum height in the central region M and the convex portion having the maximum height in the side region S are used. The certain 1st convex part 241 is each intermittently formed in the 1st direction X along the articles | goods longitudinal direction of 10 C of composite sheets, and the 1st convex part 341 and the 1st convex part 241 are said 1st direction. They are formed at different positions in X.
More specifically, in the composite sheet 10C, the pitch in the first direction X of the first protrusions 341 in the central region M (same as the distance between the center lines Cm, see FIG. 33) and the first protrusions in the side region S. The pitch of the portion 241 in the first direction X (same as the distance between the center lines Cs, see FIG. 33) is the same, and the first convex portion 341 in the central region M and the first convex portion 241 in the side region S are Are alternately formed in the first direction X. Therefore, the first convex portions 341 of all the central regions M are different in position in the first direction X from the first convex portions 241 of the side regions S. The convex portion having the maximum height in the central region M (first convex portion 341) and the convex portion having the maximum height in the side region S (first convex portion 241) are each provided with a constant pitch ( It is preferable that the distance between the centers is formed.

By changing the position of the convex portion with the maximum height in the central region M and the side region S, the convex portions with the maximum height do not overlap with each other, so the central region M and the side region S in the composite sheet 10C do not overlap. The absorbent article including the composite sheet 10C is easily bent near the boundary portion of the convex portion formation pattern. Thereby, the absorbent article is more easily deformed into a boat-like shape, and the leakage prevention performance and the like are improved.
From the viewpoint of more reliably obtaining such an effect, the convex portions having the maximum height in the central region M and the convex portions having the maximum height in the side region S are alternately arranged in the first direction X one by one. It is preferable that, in the central region M, between the two maximum projections adjacent to each other in the first direction, in the side region S, a plurality of two maximum projections adjacent in the first direction. A pattern in which two maximum height protrusions adjacent in the first direction in the central region M are interposed between the two height maximum protrusions adjacent in the first direction in the side region S. For example, a convex portion having the maximum height may be formed in both the regions M and S. Further, in the crotch part C, the central region M and the side region S are different in the position of the convex portion having the maximum height in the first direction X, and either the ventral portion A or the dorsal portion C or In both cases, the center region M and the side region S may be modified such that the position of the convex portion having the maximum height is matched in the first direction X.
Also in the composite sheet 10B according to the third embodiment described above, the position of the convex portion having the maximum height is different between the central region M and the side region S.

Further, in the composite sheet 10C, the central continuous protrusions 40M described above are formed in the central region M in the second direction Y and formed in multiple rows in the first direction X, and the side continuous protrusions described above are formed in the side region S. The portions 40S extend in the second direction Y and are formed in multiple rows in the first direction X, and the central continuous convex portions 40M and the side continuous convex portions 40S are alternately arranged in the first direction X.
Thereby, since the central continuous convex part 40M of the central region M and the side continuous convex part 40S of the side region S do not overlap, in the vicinity of the boundary part of the convex part formation pattern of the central region M and the side region S in the composite sheet 10C, The absorbent article including the composite sheet 10C is bent, and the side portions of the absorbent body and the like are easily raised. Thereby, a more stable boat-shaped shape can be formed, and the leakage prevention performance and the like during wearing are further improved.

Moreover, as shown in FIG. 33, the composite sheet 10C has both the central continuous convex portion 40M of the central region M and the side continuous convex portion 40S of the side region S at the boundary between the central region M and the side region S. A boundary region K is provided, and the center 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 convex portions 40S are inserted between the central continuous convex portions 40M adjacent in the first direction X, and the side continuous convex portions 40S adjacent in the first direction X are adjacent to each other. A central continuous convex portion 40M is inserted in between. Further, when one end in the second direction Y of the central continuous convex portion 40M and one end in the second direction Y of the side continuous convex portion 40S existing in the first direction X of the boundary region K are alternately connected, a zigzag shape is obtained.
The composite sheet 10C includes a boundary region K in which the central continuous convex portion 40M and the side continuous convex portion 40S extend in the second direction Y at the boundary portion between the central region M and the side region S. In addition to being easily bent at the boundary region K, the convex shape can also be maintained at the boundary region K, so that liquid diffusion along the bent line can be suppressed, and the leakage prevention performance during wearing is further improved.

  As shown in FIG. 37, the composite sheet 10 </ b> C can be manufactured in the same manner as the above-described method for manufacturing the composite sheet 10 except that the first roll and the second roll combined with the tooth tip surfaces are used. In FIG. 37, the tooth tip surface indicated by fine dots is the planned formation position of the joint portion of the center region or the side region in the target composite sheet 10C.

The disposable diaper as one embodiment of the present invention is an elastic member arrangement region BM in which a plurality of elastic members 19 are arranged at least in the center in the width direction of the back side portion B, like a disposable diaper 100A shown in FIG. It is preferable to provide.
The fastening tape 17 in the disposable diaper 100A shown in FIG. 38 includes a tape base material 17a and a male member of a mechanical surface fastener joined to the tape base material 17a to form a fastening portion 17c. The back sheet 13 is formed by joining a female member of a mechanical surface fastener or a non-woven fabric with high engagement. A part of the tape base material 17a of the fastening tape 17 forms a fixing portion 17b fixed in a state of being sandwiched between the back sheet 13 and the three-dimensional gather forming sheet 15. Between the left and right fastening tapes 17, 17, a plurality of thread-like or string-like elastic members 19 that contract the diaper 100 </ b> A in the width direction Ya are arranged at intervals in the longitudinal direction Xa of the diaper 100 </ b> A. . The plurality of elastic members 19 are arranged as an elastic sheet 19s configured to be fixed between two nonwoven fabrics or two folded nonwoven fabrics, and are included in the end portion of the elastic sheet 19s or the elastic sheet 19s. It is preferable that the end portion of each elastic member 19 overlaps the fixing portion 17b. The elastic members 19 are preferably arranged at regular intervals 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 17a. As the tape base material 17a, various known materials such as a nonwoven fabric are used.

The top sheet 12 of the disposable diaper 100A shown in FIG. 38 has a central continuous protrusion 40M extending in the second direction Y and the first direction X in the central region M of the composite sheet, like the composite sheet 10C described above. It is composed of a composite sheet 10X that is formed at a plurality of intervals.
In the composite sheet 10X, it is preferable that a plurality of central continuous protrusions 40M extending in the second direction Y described above extend in the second direction Y in the elastic member arrangement region BM. When the width of the central continuous convex portion 40M is P1, the interval between the elastic members 19 is P2, and the interval between the central portions of the central continuous convex portion 40M is P3, the relationship of P1 <P2 <P3 is established. It is more preferable to satisfy. The width P1 of the central continuous convex portion 40M is a width in the direction along the first direction X. As shown in FIG. 39, as a pair of joint portions facing each other across the central continuous convex portion 40M, a pair of joint portions is provided. The distance between the joints 332 having the narrowest distance between the pair of joints when the joint 332 having a relatively narrow distance between the joints 331 and the joint 331 having a relatively wide distance between the pair of joints is provided. Is the width P1 of the central continuous convex portion 40M. Moreover, it is preferable that the elastic member arrangement | positioning area | region BM is made in the width direction rather than the center area | region M of a composite sheet. FIG. 39 shows the case where the composite sheet constituting the top sheet 12 is a composite sheet 10C, but composite sheets having other configurations having a central continuous convex portion in the central region M are used for the top sheet 12. It is the same when there is.

The plurality of elastic members 19 are for shrinking the diaper in the width direction to improve the fit in the back side portion B, but are arranged to overlap the elastic member arrangement region BM in which the plurality of elastic members 19 are arranged. When the central continuous convex portion 40M and the elastic member 19 of the composite sheet 10X constituting the surface sheet 12 satisfy the above relationship, the elastic member 19 causes the back side B of the diaper 100, particularly the absorber 14 to The shape of the central continuous convex portion 40M is easily maintained even in a state where the portion extending to the back side end portion contracts in the second direction Y along the article width direction Ya. Thereby, the anti-steaming effect in the back side part B increases, and the liquid leak prevention effect from the back side part B side also increases.
In addition, since the central continuous convex portion 40M described above has a portion whose width is regularly narrowed in the second direction Y, the contraction of the central continuous convex portion 40M becomes regular, and the backside portion B is stuffy. The prevention effect increases. Moreover, the density density of the fiber density can be formed in the central continuous convex portion 40M, and the liquid absorption performance and the leakage prevention effect are improved.

  As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to the said embodiment. For example, as a surface sheet of an absorbent article, the configuration of the central region M in one of the composite sheets 10, 10A to 10C described above may be the configuration of the central region M in another sheet, or the composite described above. The configuration of the side region S in one of the sheets 10, 10A to 10C may be the configuration of the side region S in another sheet. For example, a composite sheet in which the configuration of the central region M is the same as that of the composite sheet 10 and the configuration of the side region S is the same as that of the composite sheet 10B, or the configuration of the central region M is the same as that of the composite sheet 10B and A composite sheet having the same configuration as that of the composite sheet 10 or the composite sheet 10A can also be used.

  In addition, as an elastic member for contracting the absorbent article in the longitudinal direction of the article, which is the longitudinal direction, only one of the elastic member 15a that forms a three-dimensional gather and the elastic member 16 that forms a leg gather may be provided. . In addition, the elastic member 15a that forms the three-dimensional gather and the elastic member 16 that forms the leg gather may be arranged one by one on the left and right sides of the absorbent article, respectively, or may be arranged by a plurality. good. Moreover, the elastic member which shrinks an absorbent article in the longitudinal direction of the article, which is its longitudinal direction, may not be arranged.

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

This invention discloses the following absorbent articles further regarding embodiment mentioned above.
<1>
An absorbent article comprising a top sheet made of a composite sheet, a back sheet, and an absorbent body disposed between the two sheets,
The composite sheet has a first direction along the article longitudinal direction and a second direction along the article width direction, and the laminated first sheet and second sheet are partially joined to form a plurality of joints. The first sheet protrudes in a direction away from the second sheet at a portion other than the joint portion, and forms a convex portion protruding toward the wearer's skin side,
The composite sheet has a central region in which the convex portions are formed in different patterns and a pair of side regions located on both sides of the central region,
The absorbent article in which the area ratio of the joint portion in the side region is higher than the area ratio of the joint portion in the central region.

<2>
The difference (Es-Em, percentage point) between the area ratio Es (%) of the joint portion in the side region and the area ratio Em (%) of the joint portion in the central region is preferably 5% or more, more preferably 10% or more. The absorbent article according to <1>, wherein
<3>
The area ratio Es of the joint in the side region is preferably 5% or more, more preferably 10% or more, and preferably 50% or less, more preferably 30% or less, on the premise that the area ratio Es is larger than the area ratio Em. The absorbent article according to <1> or <2>, wherein
<4>
The junction Em in the central region is preferably 30% or less, more preferably 20% or less, preferably 3% or more, more preferably 5% or more, on the premise that the joint area Em is smaller than the area ratio Es. The absorbent article according to any one of <1> to <3>.
<5>
The absorbent article according to any one of <1> to <4>, wherein the central region and the side region have the same height of a convex portion having a maximum height.

<6>
The joint portion formed in the side region is a vertically long joint portion whose whole or part is longer in the article longitudinal direction than any of the joint portions formed in the central region. The absorbent article according to any one of ~ <5>.
<7>
Of the joints formed in the side region, the length of the longitudinal joint that is longer in the first direction X than any joint formed in the central region is formed in the central region M. The length in the first direction in the joint portion 3 having the maximum length in the first direction X is preferably 1.2 times or more, more preferably 1.5 times or more, and preferably 5 times or less, more preferably The absorbent article according to any one of the above items <1> to <6>, which is 3.5 times or less.
<8>
The convex portions are arranged in a staggered manner in the central region, and the convex portions or annular connecting convex portions in which the convex portions are connected in a circular shape are arranged in the side region in a staggered manner <1 The absorbent article according to any one of> to <7>.
<9>
The joints in the central region are each a plurality of lattice-formed first joint rows in which a plurality of joints are arranged in series in a straight line at intervals, and a plurality of joints are arranged in a straight line at intervals. Formed in a grid-like arrangement pattern composed of a plurality of grid-formed second joint rows arranged in series, and each of the portions corresponding to the eyes of the grid has the convex portions formed therein. The absorbent article according to any one of 1> to <8>.
<10>
Each convex part formed in the central region is connected to the high convex part around the high convex part having a hollow part on the back side and forming the top part of the convex part. The absorbent article according to any one of <1> to <9>, wherein the absorbent article is configured with four formed low protrusions.

<11>
The absorbent body is composed of an absorbent core and a core wrap sheet that wraps the absorbent core, and the absorbent core is provided with the material for forming the absorbent core on each side of the crotch part of the absorbent article. <1> to the above, wherein the side region of the composite sheet overlaps with the whole or a part of the concave notch or penetrating part. The absorbent article according to any one of <10>.
<12>
A sheet for forming a three-dimensional gather having the elastic member fixed to the inner edge is disposed on both sides in the longitudinal direction of the absorbent article, and the inner edge of the sheet is fixed on the side region. The absorbent article according to any one of <1> to <11>.
<13>
The absorbent article according to any one of the above items <1> to <12>, wherein a central region having mutually different convex portions and side regions on both sides thereof are formed at least in the crotch part in the longitudinal direction of the article.
<14>
The absorbent article according to any one of the above items <1> to <13>, wherein the central region having different convex portions and the side regions on both sides thereof extend over the entire length of the absorbent body in the longitudinal direction of the article. .
<15>
The absorbent article according to any one of <1> to <14>, wherein the surface on the second sheet side is substantially flat in any of the central region and the side region.

<16>
The absorbent article according to any one of <1> to <15>, wherein the first sheet and the second sheet are nonwoven fabrics.
<17>
The basis weight of the nonwoven fabric is preferably 10 g / m ² or more, more preferably 15 g / m ² or more, and preferably 40 g / m ² or less, more preferably 35 g / m ² or less, <16> Absorbent article as described in 1.
<18>
In the joined portion formed by partially joining the laminated first sheet and second sheet, the first sheet and the second sheet are pressed together, and both sheets are compared to the other parts. The absorbent article according to any one of the above items <1> to <17>, which is densified.
<19>
The grid | lattice eyes in which the convex part is formed are the absorbent articles as described in any one of said <1>-<18> in which the circumference | surroundings are each enclosed by the eight junction parts 3. FIG.
<20>
The angle θ (see FIG. 7) formed by the lattice-formed first joint row LR1 and the lattice-formed second joint row LR2 is preferably 30 ° to 165 °, more preferably 45 ° to 150 °, and still more preferably. Is an absorbent article according to any one of the above items <1> to <19>, which is more than 90 ° and not more than 120 °.

<21>
In the first joint row R1, two first joint portions 31 adjacent to each other, two second joint portions R2 located on both sides of the first joint portion row R1, a total of four second joint portions 32, and Further, any one of the above <1> to <20>, which is surrounded by a total of eight joints composed of the two third joints 33 of the two third joint row R3 located on the outer side. The absorbent article as described.
<22>
The convex portion formed in the central region has a high convex portion and a plurality of low convex portions coupled to the periphery thereof, and the high convex portion of the convex portion has four first protrusions in plan view of the composite sheet. <1> to <<1>, which are surrounded by two joint portions, are circular or elliptical, and form the top of the convex portion at the center of the region surrounded by the four second joint portions. 21>. The absorbent article according to any one of 21>.
<23>
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 coupled around the high convex portions, and are opposed to each other in the first direction X. The first low convex portion is located between two second joint portions, and the second low convex portion is located between two second joint portions facing each other in the second direction Y, <1 The absorbent article according to any one of> to <22>.
<24>
The composite sheet according to any one of <1> to <23>, wherein the arrangement and form of the protrusions are different between the central region and the pair of side regions.
<25>
In the side region of the composite sheet, the first convex portion, the second convex portion, and the third convex portion, which are three types of convex portions having different heights, are formed on the first sheet that constitutes the above, The absorbent article according to any one of <1> to <23>.

<26>
A first convex portion, a second convex portion, and a third convex portion are formed in the side region, and the height of the first convex portion is H ₁ , the height of the second convex portion is H ₂ , and the third convex portion. when the height of the section was _{H 3,} satisfy the relationship of _{H 1 ≧ H 2> H 3} , the <1> to absorbent article according to any one of <25>.
<27>
In the above <26>, the height H ₁ of the first convex portion, the height H ₂ of the second convex portion, and the height H ₃ of the third convex portion satisfy the relationship of H ₁ > H ₂ > H _3. The absorbent article as described.
<28>
Each of the first convex portion and the second convex portion has a substantially circular shape in plan view, and the diameter of the circular shape is larger in the first convex portion than in the second convex portion, The absorbent article according to any one of <25> to <27>.
<29>
The 1st convex part and the 2nd convex part have the shape which has a top part in the section in any direction of the 1st direction X and the 2nd direction Y, and the 3rd convex part 43 is the plane view. The absorbent article according to any one of <25> to <28>, wherein the shape is a substantially rectangular shape that is long along the first direction X.
<30>
The annular connection convex part which one or more 1st convex parts and one or more 2nd convex parts connected with the said side area is formed in any one of said <1>-<29>. Absorbent articles.

<31>
The annular connecting convex portion is in a line-symmetrical position across a center line connecting the centers of two second convex portions arranged at a distance along the first direction in a plan view of the composite sheet. , A pair of first convex portions composed of three first convex portions arranged along the first direction X are positioned,
The three 1st convex parts which constitute the 1st convex part group are absorptive articles given in the above <30> connected along the 1st direction X.
<32>
The absorbent article according to <30> or <31>, wherein the central convex portion is formed at a substantially center in the ring of the annular coupling convex portion.
<33>
The height H ₄ of the central convex portion is substantially the same as the height H ₂ of the second convex portion, and the height H ₄ of the central convex portion is higher than the height H ₃ of the third convex portion, The absorbent article according to any one of <29> to <32>.
<34>
The second convex portion, the third convex portion, the central convex portion and the third convex portion are regularly and linearly arranged in this order along the first direction X which is one direction in the plane of the composite sheet. The absorbent article according to any one of the above items <29> to <33>.
<35>
The composite sheet according to any one of <1> to <34>, wherein the flexural rigidity in the side region is higher than the flexural rigidity in the central region.

<36>
The absorbent article according to <35>, wherein the bending rigidity in the side region is preferably 1.1 or more, more preferably 1.2 or more, in a ratio to the bending rigidity in the central region.
<37>
The bending rigidity in the side region is preferably 10 cN or more, more preferably 15 cN or more, preferably 50 cN or less, more preferably 40 cN or less, on the premise that the bending rigidity in the side region M is larger than that of the central region M. The absorbent article according to any one of <35> or <36>.
<38>
The bending rigidity in the central region S is preferably 40 cN or less, more preferably 30 cN or less, and preferably 5 cN or more, more preferably 10 cN or more, on the premise that the bending rigidity in the side region is lower than that in the side region. The absorbent article according to any one of <35> to <37>.
<39>
In the grid-forming first joint row LR1 and the grid-forming second joint row LR2, the arrangement pitch (center-to-center distance) P1 of the joints in the joint row is preferably the shortest distance LL between adjacent joints. The absorbency according to any one of <9> to <38>, which is 1.1 times or more, more preferably 1.5 times or more, and preferably 10 times or less, more preferably 5 times or less. Goods.
<40>
The convex part formed in the central region has a shape in which a low convex part extends in all directions from a high convex part of the central part, according to any one of <1> to <39>. Absorbent article.

<41>
The composite sheet includes a pair of first low protrusions extending from the high protrusions in one in-plane direction of the sheet as four low protrusions constituting the protrusions, and the sheet from the high protrusions. A second pair of second low protrusions extending in a direction orthogonal to the one direction in the in-plane direction, and the first low protrusions are higher than the second low protrusions. The absorbent article according to <40>, wherein the extension length L4 to the outermost end is long.
<42>
The said high convex part is an absorbent article as described in said <40> or <41> which has a hollow depressed toward the internal direction of the said convex part in the boundary part with the said low convex part.
<43>
A plurality of convex portions having a maximum height in the central region and a convex portion having a maximum height in the side region are formed intermittently in the first direction of the composite sheet, respectively. The convex portion having the maximum height and the convex portion having the maximum height in the side region are formed at different positions in the first direction, according to any one of <1> to <42>. Absorbent articles.
<44>
In the composite sheet, central continuous protrusions are formed in the central region M in multiple rows in the first direction X extending in the second direction Y, respectively, and the side continuous convex portions are respectively in the side regions. <1> to <43> extending in the direction Y and formed in multiple rows in the first direction X, wherein the central continuous convex portions and the side continuous convex portions are alternately arranged in the first direction X. The absorbent article according to any one of 1.
<45>
The boundary region between the central region and the side region has a boundary region where both the central continuous convex portion and the side continuous convex portion exist, and the boundary region includes the central continuous convex portion and the central continuous convex portion. The absorbent article according to any one of <1> to <44>, wherein the side continuous convex portions are alternately arranged in the first direction X.
<46>
Disposable diaper having an abdominal side portion disposed on the stomach side of the wearer when worn, a back side portion disposed on the back side of the wearer when worn, and a crotch portion positioned between the abdominal side portion and the back side portion And
A plurality of elastic members for shrinking the disposable diaper in the width direction are disposed at least in the center in the width direction of the dorsal side portion at intervals in the longitudinal direction of the disposable diaper,
A plurality of central continuous protrusions are formed in the central region of the composite sheet, each extending in the second direction and spaced in the first direction,
In the elastic member arrangement region where the plurality of elastic members are arranged, a plurality of the central continuous protrusions are formed extending in the second direction, respectively.
When the width of the central continuous convex portion is P1, the interval between the elastic members is P2, and the interval between the central portions of the central continuous convex portion is P3, the relationship of P1 <P2 <P3 is satisfied. The absorbent article according to any one of> to <45>.

100 disposable diapers (absorbent articles)
12 surface sheet 10, 10A-10C, 10X composite sheet 1 1st sheet 2 2nd sheet 41 1st convex part 42 2nd convex part M central area S side area 40, 40M central continuous convex part 40S side continuous convex part 3, 31-33 Joint part 13 Back surface sheet 14 Absorber 15 Sheet 111 for forming three-dimensional gathers First roll 112 Second roll 113 First heat roll 114 Second heat roll

Claims (10)

An absorbent article comprising a top sheet made of a composite sheet, a back sheet, and an absorbent body disposed between the two sheets,
The composite sheet has a first direction along the article longitudinal direction and a second direction along the article width direction, and the laminated first sheet and second sheet are partially joined to form a plurality of joints. The first sheet protrudes in a direction away from the second sheet at a portion other than the joint portion, and forms a convex portion protruding toward the wearer's skin side,
The composite sheet has a central region in which the convex portions are formed in different patterns and a pair of side regions located on both sides of the central region,
The area ratio of the joint in each side region is higher than the area ratio of the joint in the central region,
Wherein the central region and the respective side region, Ri heights of the maximum protrusion is the same der,
The joint part formed in the side region is an absorbent article in which all or part of the joint part is a longitudinally long joint part having a longer length in the article longitudinal direction than any of the joint parts formed in the central region .   A plurality of convex portions having a maximum height in the central region and a convex portion having a maximum height in the side region are formed intermittently in the first direction of the composite sheet, respectively. The absorbent article according to claim 1, wherein the convex portion having the maximum height and the convex portion having the maximum height in the side region are formed at different positions in the first direction.   The composite sheet has a central continuous convex portion extending in the second direction in the central region and formed in multiple rows in the first direction, and a continuous side convex portion extending in the second direction in the side region. The absorbent article according to claim 1, wherein the absorbent article is formed in multiple rows in the first direction, and the central continuous convex portions and the side continuous convex portions are alternately arranged in the first direction.   The boundary region between the central region and the side region has a boundary region where both the central continuous convex portion and the side continuous convex portion exist, and the boundary region includes the central continuous convex portion and the central continuous convex portion. The absorbent article according to claim 3, wherein the side continuous convex portions are alternately arranged in the first direction. Wherein the convex portion in the central region are arranged in a staggered manner, and the side region, the convex portion or the annular connecting protrusion protruding section is engaged in the annular are arranged in a zigzag pattern, to claim 1 The absorbent article as described. The joints in the central region include a plurality of lattice-formed first joint rows each having a plurality of joints arranged in series in a straight line at intervals, and a plurality of joints 3 in a straight line each having a spacing. Are formed in a grid-like arrangement pattern composed of a plurality of grid-formed second joint rows arranged in series with each other, and the convex portions are formed in each of the locations corresponding to the eyes of the grid. Item 6. The absorbent article according to Item 1 or 5 . The absorbent body is composed of an absorbent core and a core wrap sheet that wraps the absorbent core, and the absorbent core is provided with the material for forming the absorbent core on each side of the crotch part of the absorbent article. have not been, has a notch or a through portion in a plan view recessed, the side area of the composite sheet, overlaps the whole or part of the concave cutout portion or through unit, according to claim 1 to 6 The absorbent article according to any one of the above. And a resilient member for contracting the absorbent article to an article longitudinally is a longitudinal direction, the absorbent article according to any one of claims 1-7. A sheet for forming a three-dimensional gather having elastic members fixed to the inner edge is disposed on both sides in the longitudinal direction of the absorbent article, and the inner edge of the sheet is fixed on the side region. The absorbent article according to any one of claims 1 to 8 . Disposable diaper having an abdominal side portion disposed on the stomach side of the wearer when worn, a back side portion disposed on the back side of the wearer when worn, and a crotch portion positioned between the abdominal side portion and the back side portion And
A plurality of elastic members for shrinking the disposable diaper in the width direction are disposed at least in the center in the width direction of the dorsal side portion at intervals in the longitudinal direction of the disposable diaper,
A plurality of central continuous protrusions are formed in the central region of the composite sheet, each extending in the second direction and spaced in the first direction,
In the elastic member arrangement region where the plurality of elastic members are arranged, a plurality of the central continuous protrusions are formed extending in the second direction, respectively.
The relationship of P1 <P2 <P3 is satisfied, where P1 is a width of the central continuous convex portion, P2 is an interval between the elastic members, and P3 is an interval between central portions of the central continuous convex portion. the absorbent article according to any one of 1-5 and 8-9.

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