JP6391459B2 - 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. In addition, by forming a concavo-convex shape on the skin side of the surface sheet, the contact area with the skin of the wearer is reduced, giving a gentle touch to the skin, and reducing the liquid return that the absorbed liquid returns to the skin. Techniques for reducing stickiness and the like are also known.

As a conventional technique related to a surface sheet having a three-dimensional shape, Patent Document 1 discloses that a first protrusion protruding to the first surface side and a second protrusion protruding to the second surface side are different from each other. It is described that a nonwoven fabric having small protrusions that are alternately and continuously arranged in each direction and in which the first protrusions form the tops thereof, and that the nonwoven fabric is used as a top sheet of an absorbent article.
In addition, as a composite sheet that can be used as a surface sheet of an absorbent article, a composite sheet in which joints formed by embossing are arranged in a lattice shape, and convex portions are formed in the meshes of the lattice is also known. (See Patent Document 2).

JP 2013-177715 A Japanese Patent No. 3467376

However, when applying a three-dimensional shape to the top sheet, depending on the three-dimensional pattern, the liquid return may occur due to the deformation of the absorbent article during wearing, causing the projections of the unevenness to be crushed or the sheet to be wrinkled. In some cases, the reduction effect could not be sufficiently obtained, or the touch was worsened.
In addition, the nonwoven fabric described in Patent Document 1 is excellent in shape retention of the nonwoven fabric even at the seating pressure of the wearer, the contact area with the skin is kept low even under high pressure, and the liquid return amount is reduced. When the sheet is refracted by movement during wearing, the shape retaining property of the convex portion becomes insufficient, and the texture such as the touch may be lowered.
Moreover, the convex part which has a three-dimensional shape like the convex part of the composite sheet used for this invention is not formed in the composite sheet of patent document 2. FIG.

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

  The present invention comprises a top sheet made of a composite sheet, a back sheet, and an absorbent body disposed between the two sheets, and an article longitudinal direction along the wearer's front-rear direction when worn, and an article orthogonal to the article longitudinal direction. An absorbent article having a width direction, wherein the composite sheet has a plurality of joined portions formed by partially joining the laminated first sheet and second sheet, and the first sheet is Projecting in a direction away from the second sheet at a portion other than the joint, and forming a plurality of convex portions projecting toward the wearer's skin side, the convex portion has a hollow portion on the back side, It is composed of a high convex portion that forms the top of the convex portion, and four low convex portions that are connected to the high convex portion around the high convex portion. Surrounded by the joints and dispersed in the in-plane direction of the composite sheet Is formed in a state, there is provided an absorbent article.

  According to the absorbent article of the present invention, even if refraction occurs in the composite sheet constituting the surface sheet in a worn state, the low convex portion is preferentially crushed and the central high convex portion is not easily crushed, and the convex portion is good. Excellent touch, liquid return prevention effect and air permeability are maintained well. In addition, the surface sheet is less likely to be wrinkled, and the appearance is not easily deteriorated or uncomfortable.

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 partially broken perspective view showing a part of a composite sheet preferably used as a surface sheet of the absorbent article of the present invention in an enlarged manner. 4 is an enlarged plan view showing a part of the composite sheet shown in FIG. FIG. 5 is an enlarged plan view showing a main part of the composite sheet shown in FIG. 6A is a cross-sectional view taken along the line VIa-VIa in FIG. 5, and FIG. 6B is a cross-sectional view taken along the line VIb-VIb in FIG. 7 (a) and 7 (b) are explanatory views of the function and effect of the present invention, and FIG. 7 (a) is a photograph of a cross section taken along the first direction X of the composite sheet shown in FIG. FIG.7 (b) is the photograph which image | photographed the cross section along the 2nd direction Y of the composite sheet shown in FIG. FIG. 8 is a schematic view showing an apparatus suitably used for manufacturing the composite sheet shown in FIG. FIG. 9 is a perspective view of a part of the apparatus shown in FIG. 8 with the first roll disassembled. FIG. 10 is a diagram in which the peripheral surface of the first roll in the apparatus shown in FIG. FIG. 11 is a diagram in which the peripheral surface of the second roll in the apparatus shown in FIG. 12 is a plan view of a state where the peripheral surface of the first roll shown in FIG. 10 is engaged with the convex portion of the second roll shown in FIG. FIG. 13 is an enlarged plan view (corresponding to FIG. 4) showing another example of the composite sheet preferably used as the top sheet of the absorbent article of the present invention. FIG. 14 is a diagram in which the peripheral surface of the first roll preferably used for manufacturing the composite sheet shown in FIG. 13 is developed in a plane. FIG. 15 is a diagram in which the peripheral surface of the second roll preferably used for manufacturing the composite sheet shown in FIG. 13 is developed in a plane. FIG. 16 is a diagram in which a state in which the convex portion of the second roll shown in FIG. 15 is engaged with the peripheral surface of the first roll shown in FIG. 14 is developed in a plane.

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 in the longitudinal direction of the diaper 100, and the elastic members 15a contract to the crotch C in the worn state on the skin side of the wearer. A three-dimensional gather standing up 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

As for the diaper 100, the surface sheet 12 is comprised from the composite sheet 10 shown in FIG.3 and FIG.4. FIG. 3 is a partially broken perspective view showing a part of the composite sheet 10 in an enlarged manner.
As shown in FIG. 3, the composite sheet 10 includes a plurality of first and second sheets 1 and 2 that are partially joined to form a plurality of joints, and the first sheet 1 includes the joints. It protrudes in the direction which leaves | separates from the 2nd sheet | seat 2 in parts other than, and forms the some convex part which protrudes toward a wearer's skin side. The composite sheet 10 has a substantially flat surface on the second sheet 2 side, and has large undulations 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 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. 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.

The composite sheet 10 has a first direction X and a second direction Y orthogonal to the first direction X in the plane of the sheet. When the composite sheet 10 is incorporated in the diaper 100, the first direction X is the longitudinal direction of the diaper 100. The second direction Y coincides with the direction (article longitudinal direction) Xa, and the second direction Y coincides with the width direction (article width direction) Ya of the diaper 100.
In the composite sheet 10, the first direction X generally coincides with the feed direction of the original fabric of the first sheet 1 and the second sheet 2 in many cases. When the first sheet 1 and the second sheet 2 are, for example, non-woven fabrics, the first direction X of the composite sheet 10 often coincides with the main fiber orientation direction of the fibers constituting the non-woven fabric. Further, the first direction X of the composite sheet 10 is also a transport direction (MD) when the composite sheet 10 is manufactured by a method described later.

FIG. 4 shows a plan view of the composite sheet 10 shown in FIG. FIG. 5 is an enlarged plan view showing a part of FIG. 4 in an enlarged manner. 6A and 6B are a sectional view taken along line VIa-VIa and a sectional view taken along line VIb-VIb in FIG.
As shown in FIGS. 3 and 4, the convex portions 40 described above are formed in 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. 4, 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 composite sheet 10 has a hollow part 41V on the back side as shown in FIG. 5, FIG. 6 (a) and FIG. 6 (b), and a top part 40t of the convex part 40. And four low convex portions 42 formed around the high convex portion 41 so as to be connected to the high convex portion 41. In this specification, regarding the high convex portion 41 and the low convex portion 42 formed in a state of being connected to the high convex portion 41 around the high convex portion 41, the connected state is the adjacent high convex portion 41. And the low convex part 42 are not separated by the joint part 3, a part of one convex part forms a part of the other convex part, and a part of the other convex part is one part of the one convex part. It is said that it has protruded from the surface on the 1st sheet | seat side of a junction part continuously.
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 high convex portion 41 portion in the center, and has a substantially cross shape. In other words, in the plan view of the composite sheet 10, each convex portion 40 has a recess 45 that is recessed toward the high convex portion 41 side between the low convex portions 42 adjacent in the circumferential direction of the convex portion. ing.

  The composite sheet 10 includes a first joint 31, a second joint 32, and a third joint 33 as joints formed by partially joining the laminated first sheet 1 and second sheet 2. 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.

As shown in FIG. 4, the first joint portion 31, the second joint portion 32, and the third joint portion 33 in the present embodiment are arranged in an oblique lattice shape inclined with respect to the first direction X and the second direction Y. ing.
In addition, as shown in FIGS. 4 and 5, the first joining portion 31, the second joining portion 32, and the third joining portion 33 are arranged in different positions in the second direction Y. 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. The first joint portion 31 to the third joint portion 33 are all rectangular, 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 the pitch (center point) between the joints in the second direction Y in each row. Distance) is 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 the like, the composite sheet 10 is formed with a large number of special-shaped convex portions 40.
The convex portion 40 will be further described. As shown in FIG. 5, 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 and another adjacent convex portion 40 are separated by an annular concave portion including eight joint portions surrounding the convex portion 40 and a third convex portion 43 located between the joint portions. Yes. The third convex portion 43 is literally a “convex portion”, but the third convex portion 43 is relatively lower in height than any of the high convex portion 41 and the low convex portion 42 constituting the convex portion 40. As seen from these convex portions, they become relatively concave portions.

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. 4, 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.
In addition, the joining portion and the projecting portion are arranged in the order of the first joining portion 31, the first low projecting portion 42a, the high projecting portion 41, the first low projecting portion 42a, and the first joining portion 31 along the second direction Y. Has been. In addition, the joint portion and the convex portion are arranged in the order of the third joint portion 33, the second low convex portion 42 b, the high convex portion 41, the second low convex portion 42 b, and the third joint portion 33 along the first direction X. Has been. By adopting such an arrangement, the shape of the convex portion is easily maintained even when it is bent when worn.

  The 1st junction part 31-the 3rd junction part 33 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 the sheets 1 and 2 are joined to form the joints 31 to 33 by using fusion by heat, ultrasonic waves, and high frequency, the joints 31 to 33 are compared with parts other than the joints 31 to 33. Consolidated. 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 joined portions 31 to 33 each consisting of a fused portion.

In the diaper 100 of the present embodiment, the composite sheet 10 having the above configuration is used as the top sheet 12 with the first direction X in the article longitudinal direction Xa and the second direction Y in the article width direction Ya. According to the diaper 100 of the present embodiment, the convex portion 40 of the topsheet 12 made of the composite sheet 10 is high even when the diaper 100 is bent in the longitudinal direction so that the cross section along the longitudinal direction becomes an arc shape during wearing. The low convex portion 42b extending in the first direction X corresponding to the article longitudinal direction Xa from the convex portion 41 is preferentially crushed, and the high convex portion 41 is not easily crushed (see FIG. 7A). 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 (see FIG. 7B).
By such an action, according to the diaper 100 of the present embodiment, the good touch, the liquid return preventing effect, and the air permeability due to the convex portion are maintained well even when worn.
Moreover, since the high convex part is not easily crushed by preferentially collapsing the low convex part, it is difficult for the top sheet to be wrinkled, and it is difficult for the appearance to deteriorate or feel uncomfortable.

  Moreover, the composite sheet 10 according to the present embodiment has a pair of first low convex portions 42a extending from the high convex portions 41 in one direction in the in-plane direction as the four low convex portions 42 constituting the convex portions 40. And a pair of second low convex portions 42b extending in a direction perpendicular to the one direction in the in-plane direction of the sheet from the high convex portion 41, and the first low convex portion 42a 2 The extension length L4 from the high convex portion 41 to the outermost end is longer than the 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 flexibly bent and exhibit good fit and the like. Disposable diapers and the like that are resistant to being crushed and stably exhibit various effects due to the uneven shape can be 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 interposed therebetween are portions of a depression K (see FIG. 6A) formed at the boundary portion between the first low convex portion 42a and the high convex portion 41. 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 recess K [see FIG. 6B] 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 diaper 100 of this embodiment, a pair of 1st low convex part 42a with a comparatively long extension length is extended from the high convex part 41 to the 2nd direction Y equivalent to the article width direction Ya. The pair of second low protrusions 42b having a relatively short extension length extends from the high protrusion 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.

  Moreover, in the composite sheet 10 in this embodiment, the convex parts 40 are arranged in a staggered manner in the in-plane direction of the composite sheet. Therefore, the convex portion 40 is not easily crushed, and the topsheet 12 made of the composite sheet 10 is easily bent flexibly in various directions, improving the absorption performance and improving the fit while maintaining good touch and breathability. Etc. can be achieved.

In the composite sheet 10 in the present embodiment, the high convex portion 41 and the low convex portion 42 are both elliptical in shape in plan view, as shown in FIG. As for the high convex part 41, the 1st low convex part 42a, and the 2nd low convex part 42b, the extending direction of the major axis of an ellipse all corresponds with the 2nd direction Y. In addition, the high convex portion 41 has a shape having a top portion in the cross section in either the first direction X or the second direction Y.
In the present invention, the direction in which the low convex portion 42 extends from the high convex portion 41 is not limited to the article longitudinal direction Xa and the article width direction Ya, but each of the article longitudinal direction Xa and the article width direction Ya. You may extend in the diagonal direction which inclines with respect to.

From the viewpoint of ensuring that one or more of the effects described above are more reliably achieved, the high convex portion 41 is shown in FIG. 6A or 6B at the boundary portion with the low convex portion 42. It is preferable to have a recess K that is recessed toward the inside of the convex portion 40.
The height H2 of the low convex portion 42 is preferably 30% or higher, more preferably 40% or higher, and preferably 80% or lower, more preferably 70% or lower, of the height H1 of the high convex portion 41. Specifically, it is 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 a cross section using a digital microscope (manufactured by Keyence). The shortest distance from the lower surface of the second sheet 2 to the upper surface of the first sheet 1 at the midpoint position on the 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 Let distance be 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. It is 5 mm or more and 5 mm or less, More preferably, it is 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.

The distance L5 between the recesses 45 facing each other across the high convex portion 41 is the shorter length of the length Lx in the first direction X and the length Ly in the second direction Y of the convex portion 40. Preferably, it is 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 (first to third joints) 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.

In the absorbent article of the present invention, although not shown, in combination with the top sheet 12 made of the sheet 10, the absorbent body has one or more longitudinal grooves along the article longitudinal direction Xa, or the article width direction Ya. It is preferable to use an absorbent body having an absorbent core having one or a plurality of transverse groove portions along the line. Further, the plurality of parallel longitudinal groove portions and the plurality of parallel transverse groove portions intersect in a lattice shape, and 2 It is preferable to use an absorptive core in which a plurality of liquid absorbing portions surrounded by two vertical groove portions and two horizontal groove portions are formed in the in-plane direction. Such vertical groove portions or horizontal groove portions may be formed in the entire area of the absorbent core when viewed in plan, and a part of the absorbent core, for example, any of the ventral side, the back side, and the crotch Although it may be formed only in the portion arranged on the sheet, it is preferably formed at least in a portion overlapping with the composite sheet 10. It is also preferable to use an absorbent core having a slit extending in the longitudinal direction of the article and penetrating in the thickness direction, instead of the absorbent core having a groove.
By using a composite sheet that has a low basis weight part consisting of grooves and slits and is easy to deform, the composite sheet that does not easily collapse is used. Can keep. Also, it is difficult to wrinkle.

Further, in the composite sheet, the extension length L4a of the first low convex portion 42a in the direction orthogonal to the extending direction of the low basis weight portion including the groove portion and the slit is the width of the low basis weight portion (the groove portion and the slit). The width of the protrusion is less than the width of the absorber, and even when the absorber is bent by a groove or slit and the topsheet is refracted, the low protrusion is preferentially crushed and the high protrusion is less likely to be crushed, so that the uneven structure can be maintained It is preferable from the point.
It is preferable that a liquid absorption part has a higher density than the bottom part of a horizontal groove part or a vertical groove part located between liquid absorption parts. The structure and manufacturing method of such an absorber are described in, for example, JP2013-255558A, JP2013-255567A, and the like. Moreover, you may use such an absorber with either a vertical groove part or a horizontal groove part facing either a surface sheet side or a back surface sheet side.

  Next, a preferred method for producing the composite sheet 10 of the present embodiment will be described with reference to FIGS. As shown in FIG. 8, 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 meshing 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. 8, 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. Then, as shown in FIG. 8, the first sheet 1 that has been fed out is bitten into the meshing portion between the first roll 111 and the second roll 112, and the first sheet 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. 8, the first sheet 1 is continuously sucked to the peripheral surface of the first roll 111 to keep the shaped state, and the second sheet 2 is overlapped. 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 portions of the first roll 111, that is, on the tooth tip surfaces of the gears (see FIG. 9) described later, are bonded 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.

  FIG. 9 shows a perspective view of a part of the first roll 111 in FIG. 8 in an exploded state. 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. The order of arrangement of the gears 121 and 122 and the spacer 123 will be described later. The gear 121, the gear 122, and the spacer 123 all have the same width (tooth width). The two types of gears 121 and 122 and the spacer 123 have their axes 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. 11, the entire area of the openings 126 and 127 is included in the substantially V-shaped region. Instead, only a part of the openings 126 and 127 is included in the approximately V-shaped area. 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. 10 shows a state where the peripheral surface 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 first roll 111 has eight members, a first gear 121, a spacer 123, a second gear 122, a spacer 123, a first gear 121, a spacer 123, a second gear 122, and a spacer 123. They are integrated in order to form one cycle T ₁ and have an integrated structure in which this cycle T ₁ is repeated.

  In FIG. 10, the tooth tip surfaces indicated by fine dots are the planned positions for forming the joint portions 31 to 33 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. 10, 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. 11 shows a state in which the peripheral surface of the second roll 112 that is meshed with 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. 11, the second roll 112 is composed of an integrated body composed of 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. 11, the second roll 112, third gear 131, fourth gear 132, third gear 131, the four members form a one period _{T 2} is integrated in the order of the fourth gear 132, the period T ₂ has a repeated formed by integrated structure.

  In FIG. 10, the second roll convex portion 140B is formed by the teeth 131a of the third gear 131 and the teeth 132a 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. 11 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.

  Then, when the second roll convex portion 140B enters the first roll concave portion 140A, the first sheet 1 (not shown) is pushed into the first roll 111, and the three-dimensional shaping corresponding to the convex portion 40 is performed. Is called. 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.

  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, the composite sheet used as the top sheet in the absorbent article of the present invention may be a composite sheet 10C shown in FIG.

  In the composite sheet 10 </ b> C shown in FIG. 13, similarly to the composite sheet 10 described above, the laminated first sheet 1 and second sheet 2 are partially joined to form a plurality of joint portions 34. The sheet 1 protrudes in a direction away from the second sheet 2 at a portion other than the joint portion 34 to form a plurality of convex portions 40C that protrude toward the wearer's skin. In the composite sheet 10 </ b> C, a plurality of first direction joint rows arranged in a row at a constant pitch along the first direction X, and the joint portions 34 are constant along the second direction Y. A plurality of second-direction joint rows arranged in a line at a pitch intersect with each other in a lattice pattern, and each of the regions corresponding to the eyes of the lattice surrounded by the eight joint portions 34 is viewed in plan view. A convex portion 40C having a substantially cross shape is formed. 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 around the high convex portion 41, It is comprised from the four low convex parts 42 currently formed in the state connected with this high convex part 41. As shown in FIG. The composite sheet 10C shown in FIG. 10 is, for example, as a top sheet of the disposable diaper 100 described above, when the first direction X is used so as to coincide with the article longitudinal direction Xa, The convex portion 42 extends in an oblique direction with respect to each of the article longitudinal direction Xa and the article width direction Ya.

The composite sheet 10C shown in FIG. 13 uses a first roll in which gears and spacers are combined as shown in FIG. 14 as the first roll 111 of the apparatus shown in FIG. As the second roll 112 of the apparatus shown in FIG. 8, the above-described method for manufacturing the composite sheet 10 is performed by using a second roll in which a gear and a spacer are combined so that the tooth tip surface of the gear is arranged as shown in FIG. 15. It can be manufactured in the same manner. In the manufacturing method, on the peripheral surface of the first roll 111, a first roll recessed area 140A, which is a formation planned area of the protrusion 40C, is formed as shown in FIG. A substantially H-shaped second roll convex portion 140B ′ as shown in FIG. 15 is formed on the surface, and when the first roll 111 and the second roll 112 are engaged, the second roll convex portion The part 140B ′ fits with the first roll recessed area 140A ′, whereby the first sheet 1 is deformed to generate a large number of convex parts 40C. And the 2nd sheet | seat is joined to a 1st sheet | seat, maintaining the state, and composite sheet 10C is obtained. According to an absorbent article such as a disposable diaper using the composite sheet 10C as the top sheet 12, the composite sheet 10C has a convex part 40C having a high convex part 41 and a low convex part 42 extending from the high convex part 41. Therefore, even if the absorbent article is bent in the wearing state, the same effects as the diaper of the embodiment described above are obtained, such that the convex portion 40C is not easily crushed and wrinkles are not easily generated.
The number of joint portions surrounding the convex portion is not limited to eight.

This invention discloses the following absorbent articles further regarding embodiment mentioned above.
<1>
A top sheet made of a composite sheet, a back sheet, and an absorbent body disposed between the two sheets, the article longitudinal direction along the wearer's front-rear direction when worn, and the article width direction orthogonal to the article longitudinal direction An absorbent article having
In the composite sheet, the laminated first sheet and second sheet are partially joined to form a plurality of joints, and the first sheet is separated from the second sheet at a portion other than the joints. Projecting toward the wearer's skin side, forming a plurality of convex portions,
The convex portion includes a high convex portion having a hollow portion on the back surface side and forming a top portion of the convex portion, and four low portions formed around the high convex portion and connected to the high convex portion. An absorptive article comprising a convex portion, the convex portion being surrounded by a plurality of the joint portions and being dispersed in an in-plane direction of the composite sheet.

<2>
As the four low convex portions constituting the convex portion, a pair of first low convex portions extending in one direction from the high convex portion to the in-plane direction of the sheet, and in the in-plane direction of the sheet from the high convex portion And a pair of second low convex portions extending in a direction orthogonal to the one direction, and the first low convex portion is located at the outermost end from the high convex portion, rather than the second low convex portion. The absorbent article as described in said <1> whose extension length to is long.
<3>
The pair of first low protrusions extends from the high protrusion in the article width direction, and the pair of second low protrusions extends from the high protrusion in the article longitudinal direction, <2> Absorbent article as described in 1.
<4>
The absorbent body is composed of an absorbent core and a core wrap sheet that wraps the absorbent core, and the absorbent core is formed with a low basis weight portion including a groove and a slit, The absorption / absorption according to any one of <2> or <3>, wherein an extension length of the first low convex portion in a direction orthogonal to the extending direction of the base material is equal to or less than a width of the low basis weight portion. Sex goods.
<5>
The absorbent article according to any one of <1> to <4>, wherein the convex portions are arranged in a staggered manner in an in-plane direction of the composite sheet.

<6>
The composite sheet according to any one of <1> to <5>, wherein a surface on the second sheet side is substantially flat.
<7>
The absorbent article according to any one of <1> to <6>, wherein the first sheet and the second sheet are nonwoven fabrics.
<8>
Either one or both of the first sheet and the second sheet is a nonwoven fabric, and 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. ^The absorbent article according to any one of <1> to <7>, which is ² or less, more preferably 35 g / m ² or less.
<9>
In the planar view of the composite sheet, each of the convex portions has a shape in which a low convex portion extends in all directions from a central high convex portion, and has a substantially cross shape, <1> to <8>. The absorbent article according to any one of 8>.
<10>
In the planar view of the composite sheet, each of the convex portions has a concave portion that is recessed toward the high convex portion side between the low convex portions adjacent in the circumferential direction of the convex portion, <1> The absorbent article according to any one of to <9>.

<11>
A first direction coinciding with the article longitudinal direction and a second direction coinciding with the article width direction;
The first joint, the second joint, and the third joint surround the convex portions,
The first joint portion, the second joint portion, and the third joint portion are arranged in an oblique lattice shape that is inclined with respect to the first direction and the second direction, and any one of <1> to <11>. The absorbent article as described.
<12>
A first direction coinciding with the article longitudinal direction and a second direction coinciding with the article width direction;
As the joint part, it has a first joint part, a second joint part and a third joint part,
A plurality of first joint portions are arranged in a line at a constant pitch along the second direction to form a first joint row, and the plurality of first joint portions are also arranged in the second direction. Are arranged in a line at a constant pitch along the line to form a second joint part row, and a plurality of third joint parts are also arranged in a line at a constant pitch along the second direction to form a third joint. Forming a substring,
The first joint row and the third joint row are formed in multiple rows in the first direction at regular intervals, and the pitch between the joints in the second direction in each row (distance between the center points) is The absorbent article according to any one of <1> to <12>, which is the same.
<13>
Each of the convex portions is a total of four second joint portions, two first joint portions adjacent to each other in the first joint row, and two second joint rows located on both sides of the first joint row. Further, the absorbent article according to <13>, which is surrounded by a total of eight joints composed of two third joints in two third joint rows located on the outer side thereof.
<14>
A first direction coinciding with the article longitudinal direction and a second direction coinciding with the article width direction;
A first low convex portion is located between two second joint portions facing each other in the first direction, and a second low convex portion is disposed between the two second joint portions facing each other in the second direction. The absorbent article according to any one of <1> to <13>, wherein is located.
<15>
A first direction coinciding with the article longitudinal direction and a second direction coinciding with the article width direction;
The high convex portion and the low convex portion both have an elliptical shape in plan view of the composite sheet, and the high convex portion, the first low convex portion, and the second low convex portion are all elliptical. The absorbent article according to any one of <2> to <14>, wherein the direction in which the major axis extends coincides with the second direction.

<16>
In the cross section along the thickness direction of the composite sheet, the high convex portion of the convex portion has a depression (K) that is recessed toward the inner direction of the convex portion at a boundary portion with the low convex portion. The absorbent article according to any one of 1> to <15>.
<17>
A first direction coinciding with the article longitudinal direction and a second direction coinciding with the article width direction;
The joint and the convex are arranged in the order of the first joint 31, the first low convex 42a, the high convex 41, the first low convex 42a, and the first joint 31 along the second direction Y. The absorbent article according to any one of the above items <1> to <16>.
<18>
A first direction coinciding with the article longitudinal direction and a second direction coinciding with the article width direction;
The joint and the convex are arranged in the order of the third joint 33, the second low convex 42b, the high convex 41, the second low convex 42b, and the third joint 33 along the first direction X. The absorbent article according to any one of the above items <1> to <17>.
<19>
The height H2 of the low convex portion 42 is preferably 30% or higher, more preferably 40% or higher, and preferably 80% or lower, more preferably 70% or lower, of the height H1 of the high convex portion 41. The absorbent article according to any one of <1> to <17>, wherein
<20>
The height H1 of the high convex portion 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, any one of <1> to <19> 2. The absorbent article according to 1.

<21>
The height H2 of the low convex portion 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, <1> to <20 > Any one of>.
<22>
A first direction coinciding with the article longitudinal direction and a second direction coinciding with the article width direction;
Each of the convex portions has a recessed portion that is recessed toward the high convex portion side between adjacent low convex portions in the circumferential direction of the convex portion,
The distance L5 between the recesses (45) facing each other across the high convex portion 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. Preferably, it is 50% or more, more preferably 60% or more, and preferably 180% or less, more preferably 110% or less, according to any one of the above items <1> to <21> Absorbent and absorbent articles.
<23>
The composite sheet has a first direction and a second direction intersecting each other in plan view,
The length Lx in the first direction X and the length Ly in the second direction Y of the convex portion are each preferably 1 mm or more, more preferably 1.5 mm or more, and preferably 30 mm or less, more preferably 15 mm. The absorbent article according to any one of <1> to <22>, which is the following.

DESCRIPTION OF SYMBOLS 1 1st sheet 2 2nd sheet 12 Top sheet 13 Back sheet 14 Absorber 10, 10C Composite sheet 31 1st junction part R1 1st junction part row | line | column 32 2nd junction part R2 2nd junction part row | line | column 33 3rd junction part R3 Third joint row 40, 40C Convex portion 41 High convex portion 42 Low convex portion 43 Third convex portion 111 First roll 112 Second roll 113 First heat roll 114 Second heat roll 121 First gear 122 Second gear 123 Spacer 131 Third gear 132 Fourth gear

Claims (5)

A top sheet made of a composite sheet, a back sheet, and an absorbent body disposed between the two sheets, the article longitudinal direction along the wearer's front-rear direction when worn, and the article width direction orthogonal to the article longitudinal direction An absorbent article having
In the composite sheet, the laminated first sheet and second sheet are partially joined to form a plurality of joints, and the first sheet is separated from the second sheet at a portion other than the joints. Projecting toward the wearer's skin side, forming a plurality of convex portions,
The convex portion includes a high convex portion having a hollow portion on the back surface side and forming a top portion of the convex portion, and four low portions formed around the high convex portion and connected to the high convex portion. An absorptive article comprising a convex portion, the convex portion being surrounded by a plurality of the joint portions and being dispersed in an in-plane direction of the composite sheet.   As the four low convex portions constituting the convex portion, a pair of first low convex portions extending in one direction from the high convex portion to the in-plane direction of the sheet, and in the in-plane direction of the sheet from the high convex portion And a pair of second low convex portions extending in a direction orthogonal to the one direction, and the first low convex portion is located at the outermost end from the high convex portion, rather than the second low convex portion. The absorbent article of Claim 1 whose extension length to is long.   The pair of first low convex portions extends from the high convex portion in the article width direction, and the pair of second low convex portions extends from the high convex portion in the article longitudinal direction. The absorbent article as described.   The absorbent body is composed of an absorbent core and a core wrap sheet that wraps the absorbent core, and the absorbent core is formed with a low basis weight portion including a groove and a slit, and the low basis weight portion. The absorptive article according to claim 2 or 3 whose extension length of the 1st low convex part in the direction perpendicular to the extending direction of is below the width of this low basic weight part.   The absorbent article according to any one of claims 1 to 4, wherein the convex portions are arranged in a staggered manner in an in-plane direction of the composite sheet.