WO2017086327A1 - Absorbent article - Google Patents

Abstract

An absorbent article provided with a top sheet (12) comprising a composite sheet, a rear sheet (13), and an absorbent (14) disposed between the two sheets, wherein the composite sheet (10) has a first direction (X) along the lengthwise direction of the article and a second direction (Y) along the widthwise direction of the article, a laminated first sheet (1) and second sheet (2) are partially joined to form a plurality of joining portions, the first sheet (1) protrudes in a direction away from the second sheet (2) in portions other than the joining portions (31, 32, 33) to form convex portions protruding toward the skin of a wearer, the composite sheet (10) has a central region (M) and a pair of side regions (S, S) in which convex portions are formed in mutually different patterns, a convex portion (41) having the greatest height in the central region (M) is higher than a convex portion (41') having the greatest height in a side region (S), and the central region (M) has greater compressive deformation than does a side region (S).

Description

Absorbent articles

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 side of the skin directed to the skin side of the wearer. In addition, by forming an uneven shape on the skin side of the topsheet, it is also known to reduce the contact area with the skin of the wearer to improve air permeability and reduce stickiness to the skin. Yes.

From the viewpoint of improving air permeability and reducing the stickiness of the skin, it is preferable that the uneven shape of the surface sheet has high shape retention. However, generally, when trying to improve the shape retention, the texture (feel) is deteriorated, or the drawability of the liquid from the surface of the surface sheet to the absorber side is lowered.

Patent Documents 1 and 2 describe providing a plurality of concavo-convex regions with different shapes and heights of convex portions on a top sheet of a disposable diaper.

A typical form of an absorbent article includes a liquid-permeable top sheet, a liquid-impermeable back sheet, and a vertically long absorbent body disposed between both sheets. The absorbent body is generally composed mainly of a liquid-retaining absorbent core containing an absorbent material such as wood pulp or a water-absorbing polymer, and further includes paper, non-woven fabric, etc. covering the absorbent core. There are also things.

As a surface sheet of an absorbent article, there is known one in which a concavo-convex shape is formed on the skin-facing surface directed toward the wearer's skin by pressing treatment such as embossing. In addition, by forming a concavo-convex shape on the skin-facing surface of the topsheet, it is also known to reduce the contact area with the skin of the wearer to improve air permeability and reduce stickiness to the skin. ing. For example, Patent Document 2 relates to a nonwoven fabric having a concavo-convex shape that can be used for a surface sheet of an absorbent article, and is provided with a pattern in which ridges and grooves extending in one direction are alternately arranged in a direction orthogonal to the one direction. In the formed nonwoven fabric, a plurality of regions having different heel heights are formed, and the diameters of the constituent fibers in the regions having relatively high heel heights among the plurality of regions are set to be relatively high. It is described that it is made thinner than that of the low region. In addition, patent document 2 makes it the main subject to manufacture easily the nonwoven fabric from which such an uneven | corrugated pattern differs partially, and it does not specifically describe the usage form and effect of such a nonwoven fabric.

Also, a block-like absorbent core provided with a groove-like space extending in the plane direction is known as an absorbent core of the absorbent article. Due to its structure, the block-like absorbent core is easily deformed flexibly against external forces, so that it conforms to the complex undulating skin surface and conforms to the human body that touches the surface without gaps, and the wearer's body It is excellent in the operation follow-up property that is deformed in accordance with the movement of the skin and maintains the state of contact with the skin surface. For example, in Patent Document 3, a low-rigidity region composed of a block region is formed in the central region in the width direction of a vertically long block-shaped absorbent core so as to extend in the longitudinal direction, and both left and right sides sandwiching the low-rigidity region. Describes forming a high-rigidity region consisting of non-blocking regions. Patent Document 3 does not describe the use of a surface sheet having an uneven shape together with a block-shaped absorbent core.

JP 2009-136349 A JP 2012-214938 A JP 2013-255666 A

The present invention (first invention) is an absorbent article comprising a top sheet, a back sheet composed of a composite sheet, and an absorbent body disposed between the both 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, and forms a convex portion that protrudes toward the wearer's skin. 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, and the convex portion having the maximum height in the central region. The central first convex portion has a height higher than that of the first side convex portion which is the largest convex portion in the side region, and the amount of compressive deformation in the central region is the amount of compressive deformation in the side region. Greater than the amount.

This invention (2nd invention) comprises the absorber which comprises the absorptive core containing an absorptive material, and the surface material distribute | arranged to the skin opposing surface side of this absorber, and is equivalent to a wearer's front-back direction This is an absorbent article having a longitudinal direction and a transverse direction perpendicular thereto. The absorbent body is located in a laterally central portion of the absorbent core and extends in the longitudinal direction, and is located on both lateral sides of the core low stiffness area and compared to the core low stiffness area. It has a highly rigid core high rigidity region. The surface material is positioned on both sides in the lateral direction of the surface material low-rigidity region and overlaps with the core low-rigidity region in a plan view, as compared with the surface material low-rigidity region. The surface material high-rigidity region and the core high-rigidity region overlap each other in plan view. The absorbent article of the first invention may have all or part of the constituent requirements of the absorbent article of the second invention, or all or part of the constituent requirements of the absorbent article of the embodiment described later. preferable. The longitudinal direction in the second invention corresponds to the article longitudinal direction in the first invention, and the lateral direction in the second invention corresponds to the article width direction in the first invention.

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 (first invention). 2 is a cross-sectional view taken along line II-II in FIG. FIG. 3 is a plan view showing the top sheet of the disposable diaper of the first embodiment. 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 explanatory view of the function and effect of the present invention (first invention). FIG. 6 (a) is a schematic cross-sectional view in the width direction of a non-pressurized surface sheet (composite sheet), and FIG. It is a width direction schematic cross section of the surface sheet (composite sheet) of the pressurization state at the time of wear. FIG. 7 is a schematic diagram showing a state where the fiber density near the base of the central first convex portion is increased by pressurization. FIG. 8 is an enlarged plan view showing a part of the central region of the composite sheet used in the first embodiment. 9A is a sectional view taken along the line Va-Va in FIG. 8, FIG. 9B is a sectional view taken along the line Vb-Vb in FIG. 8, and FIG. 9C is a sectional view taken along the line Vc-Vc in FIG. is there. 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 the line Vd-Vd in FIG. FIG. 12 is a schematic plan view showing a preferred arrangement of the central continuous convex portion and the elastic member in the elastic member arrangement region formed on the back side portion of the disposable diaper of the first embodiment. FIG. 13 is a schematic view showing an apparatus suitably used for manufacturing the composite sheet shown in FIG. FIG. 14 is a diagram in which a state where the convex portion of the second roll is engaged with the peripheral surface of the central region forming portion of the first roll is developed in a plane. FIG. 15 is a diagram in which a state where the convex portion of the second roll is engaged with the peripheral surface of the side region forming portion of the first roll is developed in a plane. FIG. 16 is a plan view schematically showing the skin facing surface, that is, the surface sheet side of the disposable diaper which is an embodiment of the absorbent article of the present invention (second invention), and is a plan view obtained by extending the elastic member of each part. It is a top view in the unfolded state expanded in the shape. FIG. 17 is a cross-sectional view schematically showing a cross section taken along line II of FIG. FIG. 18 is a plan view schematically showing a part of the skin facing surface of the topsheet arranged in the diaper shown in FIG. FIG. 19 is a perspective view schematically showing an enlarged part of the surface material low-rigidity region of the surface sheet arranged in the diaper shown in FIG. 16. FIG. 20 is a perspective view schematically showing an enlarged part of the surface material high-rigidity region of the topsheet arranged in the diaper shown in FIG. FIG. 21: is a top view which shows typically the skin opposing surface of the absorbent core in other embodiment of the absorbent article of this invention (2nd invention).

Detailed Description of the Invention

Patent Document 1 discloses a technique for preventing leakage by controlling the diffusion direction of the liquid in the horizontal direction using a convex portion, and does not mention a configuration that improves both the air permeability and the liquid drawing-in property. Patent Document 2 also does not disclose a configuration that improves both air permeability and liquid draw-in.

The present invention (first invention) relates to an absorbent article that can eliminate the drawbacks of the prior art described above.

Hereinafter, the present invention (first 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 (first 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 part C is located between the back part B and the back part 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 fastening tape 17 in the diaper 100 is composed of a tape base material 17a and a male member of a mechanical hook-and-loop fastener that is joined to the tape base material 17a to form a fastening portion 17c. It is formed by joining a female member of a mechanical hook-and-loop fastener or a non-woven fabric rich in 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 elastic members 19 that contract the diaper 100 in the width direction are arranged at intervals in the longitudinal direction Xa of the diaper. 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 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 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 4 are formed in different patterns and a pair of side regions S and S located on both sides of the central region M. Yes. 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 the protrusions 4 formed in different patterns and the side regions S, S on both sides thereof are preferably formed at least in the crotch portion C in the longitudinal direction Xa of the diaper 100. It is preferably formed from C to either one or both of the ventral side A and the back side B, or the entire length of the absorbent body 14, and further to the entire length of the diaper 100. Is preferred.

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 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.

As a nonwoven fabric in the case of using a nonwoven fabric as the sheet material constituting the first sheet 1 and the second sheet 2, for example, an air-through nonwoven fabric, a spunbond nonwoven fabric, a spunlace nonwoven fabric, a meltblown nonwoven fabric, a resin bond nonwoven fabric, a needle punched nonwoven fabric, etc. 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 ² or more, and preferably 40 g / m ² or less. More preferably, it is 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, 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 central first convex portion 41 as a convex portion having the maximum height in the central region M, and has a first side convex portion 41 ′ as a convex portion having the maximum height in the side region S. Yes. And the center 1st convex part 41 is high compared with the side 1st convex part 41 '. Further, the central region M having the central first convex portion 41 has a larger amount of compressive deformation than the side region S having the first side convex portion 41 ′.

The height of the central first convex portion 41 is higher than the height of the side first convex portion 41 ′, and the amount of compressive deformation of the central region M having the central first convex portion 41 is the side having the side first convex portion 41 ′. According to the disposable diaper 100 of 1st Embodiment by being larger than the amount of compressive deformation of the area | region S, the following effects are show | played.
That is, as shown in FIG. 6, when the composite sheet 10 is pressed by the pressure from the wearer's skin during wearing of the diaper 100, the center of the central region M located in the vicinity of the wearer's liquid discharge portion. The one convex portion 41 is higher in height than the side first convex portion 41 ′, and the amount of compressive deformation as the central region M is larger than the amount of compressive deformation of the side region S, so that FIG. As shown in FIG. 3, the fiber density in the vicinity of the root K of the convex portion 41 is increased by compression, while the vicinity of the top portion is flexibly deformed to show a good touch. Therefore, the diaper 100 excellent in absorption performance can be obtained by disposing the central region M in a portion disposed near the wearer's liquid discharge portion and forming a number of points that quickly absorb the liquid.
On the other hand, the side first convex portion 41 ′ formed in the side region S is lower in height than the central first convex portion 41, and the amount of compressive deformation as the side regions S and S is also the compressive deformation of the central region M. By being smaller than the amount, even if the composite sheet 10 is pressurized by the pressure from the wearer's skin, the state of being relatively hard to be crushed and having a small contact area with the skin is maintained relatively stably. Therefore, the air permeability of the diaper 100 is increased and the stuffiness is more effectively suppressed.
Due to such an action, the disposable diaper 100 of the first embodiment is excellent in both air permeability and liquid drawability.

From the viewpoint of ensuring such an effect, the height H1 of the central first convex portion 41 (see FIG. 9A) is set to the height H1 ′ of the side first convex portion 41 ′ [see FIG. 11] is preferably 105% or more, more preferably 110% or more, preferably 200% or less, more preferably 150% or less, and preferably 105% or more and 200% or less, more preferably Is 110% or more and 150% or less.
The height H1 of the central first convex portion 41 is preferably 0.5 mm or more, more preferably 1 mm or more, preferably 5 mm or less, more preferably 4 mm or less, and preferably 0.5 mm or more and 5 mm. Hereinafter, it is more preferably 1 mm or more and 4 mm or less.
The height H1 ′ of the side first convex portion 41 ′ is preferably 0.3 mm or more, more preferably 0.6 mm or more, preferably 4 mm or less, more preferably 3 mm or less, and preferably 0. 3 mm or more and 4 mm or less, more preferably 0.6 mm or more and 3 mm or less.
Further, the difference between the height H1 of the central first convex portion 41 and the height H1 ′ of the side first convex portion 41 ′ is preferably 0.1 mm or more, assuming that the height H1> the height H1 ′. More preferably, it is 0.2 mm or more, preferably 2 mm or less, more preferably 1 mm or less, preferably 0.1 mm or more and 2 mm or less, more preferably 0.2 mm or more and 1 mm or less.

Regarding the convex portion 4 of the composite sheet 10, the height is a distance from the lower surface of the second sheet 2 facing the absorber 14 side to the upper surface of the first sheet 1 that forms the top of the convex portion 4.

The amount of compressive deformation in the central region M and the amount of compressive deformation in the side region are measured as follows.
[Measurement method of compression deformation]
A sample is cut into a predetermined size, and after measuring the thickness in a state where the measurement site is pressurized at 0.1 kPa, the thickness is measured in a state where the pressure is applied at 2.0 kPa. The difference obtained by subtracting the thickness measured under 2.0 kPa from the thickness measured under 0.1 kPa is defined as the amount of compressive deformation.
The number of measurement points is arbitrary 3 or more per sheet, and the thickness is obtained by averaging two samples (6 or more measurement points).
As samples for measurement, two samples cut out from two surface sheets (composite sheets) were used, and the measurement sites were arbitrary three or more for each of the central region and the left and right side regions of each sample. .
A rectangular plate of 20 mm × 30 mm is placed on each measurement site, and the thickness under a load of 2.0 kPa and the thickness under a load of 0.1 kPa are measured for each measurement site.
The thickness here is the thickness of the central region M including the plurality of central first convex portions 41 or the side region S including the plurality of side first convex portions 41 ′.
Then, for each measurement site, the thickness difference is calculated by subtracting the thickness under the load of 2.0 kPa from the thickness under the load of 0.1 kPa.
For the central region M, the average value of the thickness differences for a total of 6 or more measurement sites is the amount of compressive deformation of the central first convex portion 41, and a total of 12 or more measurement sites for the left and right side regions S. The average value of the thickness differences for the side is defined as the amount of compressive deformation of the side first convex portion 41 ′.
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 sample left for one day or more is cut into a predetermined size with a sharp razor. A flat plate with a load adjusted to 0.1 kPa is placed so as to cover the entire surface of the cut sample, and after 1 minute or more has elapsed, the distance from the horizontal support surface on which the sample is placed to the flat plate is measured. Thereafter, the same measurement is performed at 2.0 kPa.
If it is difficult to measure with the naked eye, the cross section of the cut sample may be observed and measured at a magnification of 20 to 100 times using, for example, a microscope (VHX-1000 manufactured by KEYENCE).

The height H1 of the central first convex portion 41 and the height H1 ′ of the side first convex portion 41 ′ 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 cross 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.

The said composite sheet 10 used for the surface sheet 12 of the diaper 100 of 1st Embodiment is further demonstrated.
[Configuration of the central region M of the composite sheet 10]
FIG. 8 shows an enlarged plan view of the central region M of the composite sheet 10 shown in FIG. 9A to 9C 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.
As shown in FIGS. 3, 4, and 8, in the central region M of the composite sheet 10, a central continuous convex portion 40 that extends continuously in the second direction Y is separated from the first direction X by a certain distance. A plurality of lines are formed. In each of the central continuous convex portions 40, as shown in FIG. 8 and FIG. 9A, the central first convex portions 41 alternately arranged in the second direction Y and the central first convex portions 41 are higher. The lower central second convex portion 42 is connected to each other. In this specification, a convex part is connected that two adjacent convex parts are not separated by a joint part, and a part of one convex part forms a part of the other convex part. And a part of the other convex part forms a part of the one convex part.
The central first convex portion 41 and the central second convex portion 42 constituting the central continuous convex portion 40 preferably have a cavity at least on the back side of the central first convex portion 41, and have a cavity on each back side, The hollow of the back surface of the center 1st convex part 41 and the cavity of the back surface of the center 2nd convex part 42 continue, and the continuous hollow part extended continuously along the 2nd direction Y on the back side of the center continuous convex part 40 More preferably, 40V is formed.
As shown in FIG. 8, each of the central first convex portion 41 and the central second convex portion 42 constituting the central continuous convex portion 40 has a substantially circular shape in plan view. Further, the central first convex portion 41 and the second convex portion 42 have a shape having a top portion in the cross section in any of the first direction X and the second direction Y.

As shown in FIG. 8, the central region M of the composite sheet 10 extends in the second direction Y and continues in the second direction Y, and has no joint portion in the second direction Y. Embossed regions E that extend and have joints formed in a regular pattern are alternately formed in the first direction X.
In the embossed region E, a first joint 31 and a second joint 32 are formed as joints formed by partially joining the laminated first sheet 1 and second sheet 2 by embossing. ing. In these joint portions 31 and 32, the first sheet 1 and the second sheet 2 are integrally pressed by embossing, and both the sheets are higher in density than the other portions, preferably Are thermally fused between the two sheets by melting of the constituent resin of one or both sheets and subsequent solidification.

In each embossed region E, the first joint portion 31 and the second joint portion 32 have different arrangement positions in the second direction Y as shown in FIG. Further, the first joint portion 31 and the second joint portion 32 are also different in lengths L1 and L2 along the second direction Y. Each of the first joint portions 31 has a rectangular shape in plan view, and each side of the rectangle coincides with the first direction X or the second direction Y. The second joint portion 32 has a substantially square shape in plan view, and each side of the square coincides with the first direction X or the second direction Y.
The first joint portions 31 having a rectangular shape are arranged in a line at intervals along the second direction Y with the long sides thereof aligned with the first direction X. Thereby, the first joint portion row R1 along the second direction Y is formed. The second joint portions 32 are arranged in a line at intervals along the second direction Y, with one of two sides orthogonal to each other coinciding with the second direction Y and the other side with the first direction X. ing. Thereby, the second joint row R2 along the second direction Y is formed.
In each first joint row R1, the arrangement interval of the first joints 31 in the second direction Y is constant. In each second joint row R2, the arrangement intervals of the second joint portions 32 in the second direction Y have two types of intervals, and alternately have wide portions and narrow intervals. . In each first joint row R1, the arrangement positions of the first joints 31 when viewed along the second direction Y are all the same. Also in each second joint row R2, the arrangement positions of the second joints 32 when viewed along the second direction Y are all the same.

Each embossed region E includes one first joint row R1 and two second joint rows R2 located on both sides in the first direction X, as shown in FIG.
When attention is paid to one first joint 31 constituting the first joint row R1, a total of four second joints 32 constituting two second joint rows R2 are formed around the first joint 31. The four corners of the first joint portion 31 are arranged close to each other with the corners facing each other. Accordingly, a group of joint portions 30 including one first joint portion 31 and four second joint portions 32 located around the first joint portion 31 is formed. In each embossed region E, a plurality of similar joint groups 30 are formed along the second direction Y at regular intervals.

In the composite sheet 10, the first joint portion 31 and the second joint portion 32 are formed in the above-described manner, and the portion corresponding to the non-embossed region N in the first sheet 1 when the composite sheet 10 is manufactured. 8 or the embossed region E in the central region M of the composite sheet 10 by pressing the portion corresponding to the portion between the first joint portions 31 from the back surface side or sucking from the front surface side. A central continuous convex portion 40 including a central first convex portion 41, a central third convex portion 43, and the like having a plan view shape and a cross-sectional shape as shown in FIG. 9 are formed.

The central continuous convex portion 40 of the central region M of the composite sheet 10 used in the first embodiment 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. 8, a central first convex portion 41 is formed between a pair of first joint portions 31 that are opposed to each other with the non-embossed region N interposed therebetween, and are opposed to each other with the non-embossed region N interposed therebetween. A central second convex portion 42 is formed in a region surrounded by a total of four second joint portions 32 composed of two pairs of second joint portions 32, and the center in the direction along the first direction X is the center. The length L42 of the central second convex portion 42 is shorter than the length L41 of the first convex portion 41. The central continuous convex portion 40 is a constricted portion whose width (length in the first direction X) is narrower than that of the central first convex portion 41 in the central continuous convex portion 40. .

The composite sheet 10 used in the first embodiment has a discontinuous central third convex portion 43 surrounded by an annular concave portion in the embossed region E as shown in FIGS. 8 and 9C. have. The central third convex portion 43 has a shape having a top portion in the cross section in any of the first direction X and the second direction Y. The central third convex portion 43 is lower than the central first convex portion 41. The center third convex portion 43 has the cavity 43V on the back side thereof, but may not have such a cavity 43V.

As shown in FIG. 8, a plurality of the central third convex portions 43 are linearly arranged in a row at a constant distance along the second direction Y to form the central third convex portion row. is doing. The central second convex portion 42 and the central third convex portion 43 are formed at the same position in the second direction Y. More specifically, the central second convex portions 42 and the central third convex portions 43 are arranged alternately and linearly along the first direction X. The central third convex portion 43 is located between the central first convex portions 41 and 41 in the directions Da and Db intersecting the second direction Y. The directions Da and Db intersecting the second direction Y in the present embodiment are directions inclined with respect to the first direction X and the second direction Y, respectively, but the central third convex portion 43 is in the second direction Y. In the first direction X, which is a direction intersecting with the center first convex portions 41, 41 may be located between each other.
Further, as shown in FIG. 8, when attention is paid to the fourth convex portion 44 in addition to the central second convex portion 42 and the central third convex portion 43, these three types of convex portions are the central second convex portion 42 and the central second convex portion 42. The 4th convex part 44, the center 3rd convex part 43, and the 4th convex part 44 are arrange | positioned regularly and linearly along the 1st direction X in this order.
The upper surface of the fourth convex portion 44 is generally flat. Although the fourth convex portion 44 is literally a “convex portion”, the fourth convex portion 44 is relatively more than any of the central first and second convex portions 41, 42 constituting the central continuous convex portion 40. Since the height is relatively low and the height is relatively lower than that of the central third convex portion 43, the concave portions are relatively viewed from these convex portions.

The central region M of the composite sheet 10 used in the present embodiment includes the first central convex portion 41, the central second convex portion 42, the central third convex portion 43, and the fourth portion described above on the first sheet 1 that constitutes the central region M. A convex portion 44 is formed. The height of the fourth convex portion 44 is lower than any of the central first convex portion 41, the central second convex portion 42, and the central third convex portion 43.

[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 1 has a convex portion formed so as to protrude in a direction away from the second sheet 2 in a portion other than the joint portion. It is formed in a pattern different from the convex portion in the central 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 is a cross-sectional view taken along the line Vd-Vd in FIG.
As shown in these drawings, in the side region S of the composite sheet 10, the third joint 33 is regularly arranged with two kinds of intervals La and Lb along the second direction Y. A plurality of columns R are formed in the first direction X. More specifically, the second direction joint line R includes a first distance La and a second distance Lb wider than the first distance La as the distance between the third joints 33 in the second direction Y. The plurality of third joint portions 33 in the second direction joint portion row R are intermittently arranged in the second direction Y so as to have these two kinds of intervals alternately in the second direction Y. ing.

The plurality of third joint portions 33 constituting each second direction joint portion 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. A gap having a constant width W is formed between R. In addition, the second direction joint row R formed in a plurality of rows in the first direction X has the arrangement positions of the third joints 33 in the second direction Y every other row, and is adjacent to the second direction. In the joint portion rows R, the arrangement positions of the third joint portions 33 in the second direction Y are different from each other. Specifically, in the side region S of the composite sheet 10 in the present embodiment, as shown in FIG. 10, the arrangement positions of the third joint portions 33 in the second direction Y are mutually arranged as the second direction joint portion row R. Different second direction first joint rows R3 and second direction second joint rows R4 are alternately formed in the first direction X, and the arrangement position of the third joint 33 in the second direction Y is different. In the second direction first joint row R3 and the second direction second joint row R4, the first joint in the other joint row R is between the third joints 33 adjacent to each other at the second interval Lb. A pair of third joint portions 33 that are adjacent to each other at the interval La are positioned.

Then, as shown in FIG. 10, in the region surrounded by a total of six joints 33 including the two third joints 33 and 33 adjacent in the second direction joint row R, the side first One convex portion 41 'is formed.
In the composite sheet 10 of the present embodiment, each pair of second-direction joint portions R includes a pair of joint portions 34 including a pair of third joint portions 33 that are disposed close to each other in the second direction Y at the first interval La. In the second direction Y, the side first convex portion 41 ′ is intermittently disposed at an interval Lb that is at least twice the first interval La, and the side first convex portion 41 ′ Is formed. The joint portion pair 34 includes a pair of third joint portions 33 that are adjacent to each other at the narrowest interval La in the second direction joint portion row R.

In the composite sheet 10, the third joint portion 33 is formed in the above-described manner, and a region surrounded by a total of six third joint portions 33 in the first sheet 1 when the composite sheet 10 is manufactured. The portion corresponding to is pressed from the back surface side or sucked from the front surface side, and the like in the side regions S and S of the composite sheet 10 in a plan view shape and a cross-sectional shape as shown in FIGS. A large number of side first convex portions 41 ′ are formed.

As shown in FIGS. 3, 5, and 10, in the side region S of the composite sheet 10, the side first convex portions 41 ′ are formed in the composite sheet 10 in the form of dotted spots in plan view, more specifically in a staggered pattern. Is formed. The side first convex portion 41 ′ is surrounded by the six third joint portions 33 described above. The six third joint portions 33 surrounding the side first convex portions 41 ′ and the portions between the third joint portions 33 adjacent to each other in the six third joint portions 33 are the central portions of the side first convex portions 41 ′. Is formed in a state of being dispersed in the planar direction of the composite sheet 10.
More specifically, as shown in FIG. 10, an angle θ (see FIG. 10) between the first virtual straight line L <b> 3 and a plurality of first virtual straight lines L <b> 3 parallel to each other on the composite sheet 10 in plan view. Assuming a plurality of second virtual straight lines L4 that are parallel to each other, the side first convex portion 41 ′ is located at each intersection of the first virtual straight line L3 and the second virtual straight line L4. . The angle θ (see FIG. 10) formed by the first virtual line L3 and the second virtual line L4 is preferably 30 ° or more and 165 ° or less, and more preferably 45 ° or more and 150 ° or less. The first imaginary straight line L3 and the second imaginary straight line L4 may be drawn so that the side first convex portion 41 ′ is located at the intersection of both. In the example shown in FIG. 10, the first virtual line L3 and the second virtual line L4 are both inclined with respect to the first direction X and the second direction Y, but the first virtual line L3 and the second virtual line L4 are inclined. Either one or both of the straight line L3 and the second virtual straight line L4 may be parallel to the first direction X or the second direction Y.

In the side region S of the composite sheet 10, a plurality of side first convex portions 41 ′ are arranged at regular intervals along a plurality of third direction convex portion rows in series along the first imaginary straight line L 3. The side first convex portions 41 ′ are formed with a plurality of fourth direction convex portion rows arranged in series along the second virtual straight line L4 at a constant interval. In addition, a third direction joint row R5 in which a plurality of joint pairs 34 are arranged in series at a constant interval is formed between adjacent third direction convex rows, and between adjacent fourth direction convex rows. A fourth direction joint row R6 in which a plurality of joint pairs 34 are arranged in series at a constant interval is formed. The first imaginary straight line L3 extends in parallel between a plurality of joint pairs (third joint rows) R5 in which a plurality of joint pairs 34 (or a plurality of joints 33) are arranged in series at a constant interval. Assuming that the second imaginary straight line L4 is parallel to the joint row (third joint row) R6 in which a plurality of joint pairs 34 (or a plurality of joints 33) are arranged in series at a constant interval. It is preferable to assume that it extends.
Between the pair of third joints constituting each joint pair 34 and between the pair of adjacent joints 34 around the side first convex part 41 ′, there are minute convex parts 44 ′. The convex portion 44 ′ has a height that slightly protrudes from the upper surface of the third joint portion 33, and usually the height H4 ′ is 1/3 or less of the side first convex portion 41 ′.
Therefore, an air passage through which air easily flows is provided between the third direction convex row and between the fourth direction convex rows, and excellent air permeability is obtained.

In the first embodiment, as described above, a plurality of central continuous convex portions 40 configured to include the central first convex portion 41 are formed in the central region M of the composite sheet 10 used as the top sheet 12. On the other hand, in the side region S, side first convex portions 41 ′ are formed in a dotted shape.
Therefore, a high density region of fibers generated near the root K of the convex portion due to compression of the central first convex portion 41 is generated in a large number or continuously along the central continuous convex portion 40, and the liquid absorption performance in the central region M is improved. Further improvement. In addition, in the side region S, the side first convex portions 41 ′ are formed in a dotted shape, so that the side first convex portions 41 ′ are more difficult to deform with respect to pressure.
By these, air permeability and liquid drawing-in property can be further improved.

The central continuous convex portion 40 preferably extends in the article width direction Ya (second direction Y), but the same applies to the case where the center continuous protrusion 40 extends in the article longitudinal direction Xa (first direction X). An effect is obtained.
Further, in the first embodiment, the central continuous convex portion 40 formed in the central region M of the composite sheet 10 has a central first convex portion 41 and a central second convex portion that is lower than the central first convex portion 41. Although the convex portion 42 is alternately connected, the central first convex portion, which is the convex portion having the maximum height, may be continuously provided. In that case, the same effect can be obtained.
Further, in the side region S, only the first side convex portion 41 ′ having the maximum height and the above-described minute convex portion 44 ′ may be formed as in the present embodiment. 2nd convex part (not shown) which has thickness may be further formed, for example, it is distributed in the state where side 1st convex part 41 'and 2nd convex part (not shown) were mixed in the plane direction. You may do it.

Moreover, in 1st Embodiment, the center continuous convex part 40 formed in the center area | region M of the composite sheet 10 is extended along the article width direction Ya (2nd direction Y). The first side projections 41 'are located at the intersections of the lattice described above. Therefore, the moisture generated from the liquid absorbed by the high density region of the fiber generated in the vicinity K of the convex portion formed in the central region M is the continuous hollow portion 40V formed in the central continuous convex portion 40 or the central continuous portion. Diffuses in the width direction passing between the convex portions 40, and is effectively diffused to the entire side surfaces passing between the third direction convex portion rows and between the fourth direction convex portion rows formed in the side region S. Therefore, the stuffiness at the time of wearing can be suppressed further.

In the composite sheet 10 used in the first embodiment, since the central first convex portion 41 is sandwiched by the central third convex portion 43 in the central region M, the center in the central first convex portion 41 is pressed. A portion higher than the height of the third convex portion 43 is deformed in the plane direction, and a portion lower than the height of the central third convex portion 43 is less likely to be deformed in the plane direction. A fiber density gradient in which the fiber density increases from the portion B1 toward the portion B2 is likely to occur between the top portion B1 deformed by pressurization and the vicinity portion B2 of the joining point of the second sheet 2. Thereby, the drawing-in property of the liquid from the first sheet 1 to the second sheet 2 is further excellent.

Further, the center third convex portion 43 in the central region M has a height H3 equal to the height H1 ′ of the side first convex portion 41 ′.
Since the pressure applied to the topsheet 12 can be dispersed when the center first convex portion 41 is crushed due to the equal height, the side first convex portion 41 ′ of the side region S is more difficult to deform with respect to the pressure. Further, the air permeability in the side region S can be ensured more reliably.
In addition, in the expression that the height is equal, in addition to the case where the height H3 of the central third convex portion 43 and the height H1 ′ of the side first convex portion 41 ′ are strictly equal, the central third convex portion 43 The case where the difference between the height H3 of the first side convex portion 41 ′ and the height H1 ′ of the side first convex portion 41 ′ (the absolute value of H3−H1 ′) is within 10% of the height H3 of the central third convex portion 43 is also included. It is.

In the composite sheet 10 used in the first embodiment, as shown in FIG. 8, a plurality of central third convex portions 43 in the central region M are formed along the second direction Y, and in the second direction Y, A first joint portion 31 that is a vertically long joint portion that is long in the first direction X is formed between adjacent central third convex portions 43. A fiber density gradient in which the fiber density increases from the top of the central first convex portion 41 toward the first joint portion 31 due to the presence of the first joint portion 31 that is a vertically long joint portion between the central third convex portions 43. Is more easily formed, and the liquid absorbability is further improved.

Moreover, in the disposable diaper 100 of 1st Embodiment, the composite member mentioned above in elastic member arrangement | positioning area | region BM (refer FIG. 1) by which the several elastic member 19 was arrange | positioned in the width direction center part of the back side part B at least. The central region M of the sheet 10 is arranged, and the central continuous convex part 40 configured to include the above-described central first convex part 41 is extended in the second direction Y in the elastic member arrangement region BM. A line is formed.
Then, as shown in FIG. 12, the width of the central continuous convex portion 40 in the elastic member arrangement region BM is P1, the interval between the elastic members 19 is P2, and the interval between the central portions of the central continuous convex portion 40 is P3. The relationship of P1 <P2 <P3 is satisfied.

The plurality of elastic members 19 in the disposable diaper 100 are for shrinking the diaper in the width direction to improve the fit in the back side portion B, but are overlapped with the region BM where the plurality of elastic members 19 are arranged. When the central continuous convex portion 40 and the elastic member 19 of the composite sheet 10 constituting the surface sheet 12 to be disposed satisfy the above relationship, the elastic member 19 causes the back side portion B of the diaper 100, particularly the absorber 14. Even in a state where the portion extending to the back end portion side contracts in the second direction Y along the article width direction Ya, the shape of the central continuous convex portion 40 is easily maintained, and the liquid absorption effect is hardly impaired. Thereby, the liquid absorption effect in the back side part B increases, and the liquid leakage from the back side part B side can be suppressed.
Further, when the first joint portions 31 as the longitudinal joint portions described above are arranged at equal intervals in the second direction Y along the article width direction Ya, the contraction of the central continuous convex portion 40 accompanying the contraction of the elastic member 19. However, it becomes regular and a density gradient of the fiber density is also formed in the central continuous convex portion 40, and the liquid absorption effect in the back side portion B is further enhanced.

The first joint portion 31 that is a vertically long joint portion preferably has a length along the first direction X of 1.2 times or more, particularly 1.5 times or more of the length along the second direction Y, Further, it is preferably 5 times or less, particularly preferably 3 times or less, more specifically 1.2 times or more and 5 times or less, particularly preferably 1.5 times or more and 3 times or less.
In addition, the first joint portion 31 that is a vertically long joint portion has a length along the first direction X that is 1.2 times or more the length along the first direction X of the second joint portion 32, particularly 1.5. Is preferably 5 times or less, more preferably 5 times or less, particularly preferably 3 times or less, and more specifically 1.2 times or more and 5 times or less, particularly 1.5 times or more and 3 times or less. Is preferred.

The length along the first direction X of the first joint portion 31 that is a longitudinally long joint portion is preferably 0.5 mm or more, particularly preferably 1 mm or more, more preferably 10 mm or less, and particularly preferably 5 mm or less. Is preferably from 0.5 mm to 10 mm, particularly preferably from 1 mm to 5 mm.
The length along the first direction X of the second joint portion 32 is preferably 0.1 mm or more and 5 mm or less, particularly preferably 0.5 mm or more and 3 mm or less, and the length along the second direction Y is 0.00. It is preferably 1 mm or more and 5 mm or less, particularly 0.5 mm or more and 3 mm or less.
Further, the third joint portion 33 preferably has a length along the first direction X of 0.1 mm to 5 mm, particularly 0.5 mm to 3 mm, and a length along the second direction Y of 0. It is preferably 1 mm or more and 5 mm or less, particularly 0.5 mm or more and 3 mm or less.
Further, in the second direction joint portion row R for the third joint portion 33, the interval La between the third joint portions 33 in the second direction Y is large between the third joint portions 33 in the narrow portion. 2 times or more, particularly 2.5 times or more, preferably 5 times or less, particularly 4 times or less, preferably 2 times or more and 5 times or less, particularly 2.5 times or more 4 times. It is preferable that it is less than 2 times.

The heights H2, H3, H4, and H4 ′ of the convex portions 42, 43, 46, and 44 ′ are directed toward the absorber 14 in the same manner as the central first convex portion 41 and the side first convex portion 41 ′. The height H1 of the central first convex portion 41 is defined as the distance from the lower surface of the second sheet 2 to the upper surface of the first sheet 1 that forms the top of the convex portion 4 (FIGS. 9 and 11). And, it is measured in the same manner as the measuring method of the height H1 ′ of the side first convex portion 41 ′.

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. 13, 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. 13, 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 T 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. 13, the first sheet 1 that has been fed out is engaged with the meshing portion of 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.

Next, as shown in FIG. 13, 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 located on the convex portion 11a of the first roll 111 are joined by thermal fusion to form joined portions 31 to 33.

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 materials constituting the first sheet 1 and the second sheet 2, for example, the thermoplastic resin, are melted in the joint portions 31 and 32 located on the convex portion 11a of the first roll 111, and the joint portions 31 to 32 are melted. 33 is 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.

The first roll 111 and the second roll 112 are a combination of a plurality of types of gears and spacers having different tooth formation patterns in the circumferential direction, which are concentrically attached to the shaft core and accumulated in a roll shape. The first roll 111 and the second roll 112 are different in the gear tooth pitch, the gear combination, the spacer arrangement, and the like in the central region forming portion and the side region forming portion.
FIG. 14 shows a state in which the convex portion of the second roll 112 meshes with the peripheral surface of the central region forming portion of the first roll 111 in a flat state, and FIG. 15 shows the first roll. A state where the convex portion of the second roll 112 is engaged with the peripheral surface of the side region forming portion 111 is shown in a flat state. 14 and 15, the direction indicated by the arrow U is the rotation direction of the first roll 111 and the second roll 112, and the direction indicated by the arrow V is the axial direction of the first roll 111 and the second roll 112. Further, in FIG. 14 and FIG. 15, the rectangular or square area indicated by fine dots indicates the tooth tip surface of the gear in the first roll 111, and the area indicated by coarse dots is indicated by the second roll. The tooth-tip surface of the gear in 112 is shown.

In the shaping process for forming the first sheet 1 as described above, the first sheet 1 is formed in the recess formed on the peripheral surface of the first roll 111 in each of the central region forming portion and the side region forming portion. The three-dimensional shaping corresponding to each convex part of the center area | region M and the side area | regions S and S is performed by being pushed in by the tooth-tip surface of each gear of the 1st roll 111. 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. When the first sheet 1 is deformed into a concavo-convex shape by being engaged with the meshing portion of the first roll 111 and the second roll 112, the first sheet 1 is sucked toward the inner direction of the first roll. It is preferable to promote the deformation of the first sheet 1 into the uneven shape.

Since the crotch part arranged in the inseam of the wearer when worn in the absorbent article is sandwiched between the thighs of the wearer while wearing the absorbent article, the direction corresponding to the front and back direction of the wearer is the vertical direction, When the direction orthogonal to the vertical direction is the horizontal direction, the image is easily compressed in the horizontal direction. The conventional absorbent article is bent and deformed irregularly when the crotch is compressed in the lateral direction, so that the skin contact of the crotch is bad, and it is excreted from the excretion part of the wearer to the crotch The problem is that urine and other excreted liquids are not received at a predetermined site by irregular bending deformation of the crotch, so that so-called liquid splattering easily occurs, and even a small amount of excreted liquid tends to leak. was there.

Therefore, the present invention (second invention) relates to providing an absorbent article that has good skin contact with the crotch, is excellent in wearing feeling, and hardly leaks.

Hereinafter, the absorbent article of the present invention (second invention) will be described with reference to the drawings based on preferred embodiments thereof. The disposable diaper 200 which is one Embodiment of the absorbent article of this invention (2nd invention) is shown by FIG.16 and FIG.17. The diaper 200 has an abdominal side portion 1F disposed on the abdomen side of the wearer when worn, a back side portion 1R disposed on the back side, and a crotch portion 1M positioned therebetween, and from the abdominal side portion 1F. It extends to the back side 1R via the crotch 1M, and has a longitudinal direction X corresponding to the wearer's front-rear direction and a lateral direction Y orthogonal thereto. The abdominal side portion 1F, the crotch portion 1M, and the back side portion 1R correspond to respective regions when the diaper 200 is divided into three equal parts in the vertical direction X. The crotch part 1M has an excretion part facing part that is disposed to face an excretion part such as a wearer's penis when the diaper 200 is worn, and the excretion part facing part is usually a central part in the longitudinal direction X of the diaper 200. Or it is located in the vicinity.

As shown in FIGS. 16 and 17, the diaper 200 is disposed on the skin-facing surface side of the absorbent body 4 having an absorbent core 140 and can be in contact with the wearer's skin when worn. A liquid-permeable top sheet 102 and a liquid-impermeable or water-repellent back sheet 103 disposed on the non-skin-facing surface side of the absorbent body 4, in a plan view as shown in FIG. The central part of the vertical direction X located in the crotch part 1M is formed in a vertically long hourglass shape that is bound inward and is long in one direction, that is, the vertical direction X. Each of the top sheet 102 and the back sheet 103 has a size larger than that of the absorbent body 4 interposed between the two sheets 102 and 103.
The top sheet 102 is longer than the absorbent body 4 in the longitudinal direction X, but is substantially the same as the absorbent body 4 in the lateral direction Y, that is, in the plan view as shown in FIG. Both side edges 2S, 2S along the longitudinal direction X of the sheet 102 coincide with both side edges along the longitudinal direction X of the absorbent body 4. As will be described later, the absorbent body 4 is configured to include the absorbent core 140 and the core wrap sheet 45, and both side edges 2 </ b> S and 2 </ b> S of the topsheet 102 are in the vertical direction at the maximum width portion of the absorbent core 140. It coincides with both side edges along X (see FIG. 17).
On the other hand, as shown in FIG. 17, the back sheet 103 has a size larger than that of the top sheet 102 in the lateral direction Y, extends outward from the peripheral edge of the absorbent body 4, and is in a developed and extended state as shown in FIG. The outer shape of the diaper 200 is formed. As the back sheet 103, various types conventionally used for this type of absorbent article can be used without particular limitation, and a resin film, a laminate of a resin film and a nonwoven fabric, or the like can be used.

In the present specification, the “skin facing surface” is a surface of the absorbent article or its constituent member (for example, the absorbent body 4) that is directed toward the wearer's skin when the absorbent article is worn, that is, relative to the wearer's skin. The side close to the skin, and the “non-skin-facing surface” is the surface of the absorbent article or its constituent members that is directed to the side opposite to the skin side (clothing side) when the absorbent article is worn, that is, relatively worn The side far from the person's skin. In addition, "at the time of wearing" here means a state where a normal proper wearing position, that is, a correct wearing position of the absorbent article is maintained, and the absorbent article is in a state of being deviated from the wearing position. Is not included.

Moreover, the side sheet | seat 5 is distribute | arranged to the right-and-left both sides along the vertical direction X in the surface sheet 102 side of the diaper 200, respectively. The side seat 5 has an inner edge along the vertical direction X, and an outer edge along the vertical direction X that is located outside the inner edge in the lateral direction Y, and has a flat surface as shown in FIG. In view, the inner edge overlaps with the absorber 4, and the outer edge extends outward in the lateral direction Y from the side edge along the longitudinal direction X of the absorber 4, as shown in FIG. 103. Between the side sheet 5 and the back sheet 103 in the left and right leg portions arranged around the legs of the wearer, it is fixed in a stretched state along the longitudinal direction X of the thread-like elastic member 50, whereby a diaper A pair of leg gathers is formed in the leg portion when the 200 is worn by contraction of the elastic member 50. In addition, a thread-like elastic member 51 is fixed to the inner edge of the side seat 5 in a stretched state along the longitudinal direction X. As a result, when the diaper 200 is worn, at least the crotch 1M is contracted by the contraction of the elastic member 51. The side sheet 5 rises toward the wearer's skin with the inner edge as a starting point at the joint with the back sheet 103 to form a leak-proof cuff. This leak-proof cuff can prevent outflow of excretion fluid such as urine outward in the lateral direction Y, so-called lateral leakage. The top sheet 102, the back sheet 103, the absorber 4, the side sheet 5, and the elastic members 50 and 51 are joined to each other by a known joining means such as a hot-melt adhesive.

The diaper 200 is a so-called unfolded disposable diaper. As shown in FIG. 16, a pair of fastening tapes 6 and 6 are provided on both side edges along the longitudinal direction X of the back side 1R of the diaper 200. . A fastening portion (not shown) made of a male member of a mechanical surface fastener is attached to the fastening tape 6. Moreover, the to-be-attached area | region 7 which consists of a female member of a mechanical hook-and-loop fastener is formed in the non-skin opposing surface of the belly side part 1F of the diaper 200. The to-be-attached region 7 is formed by attaching a female member of a mechanical hook-and-loop fastener to a non-skin facing surface of the back sheet 103 that forms a non-skin facing surface of the abdominal side portion 1F by a known joining means such as an adhesive or heat seal It is formed by joining and fixing, and the fastening portion of the fastening tape 6 can be detachably fastened.

Hereinafter, the absorber 4 will be described.
The absorber 4 has a shape that is long in the longitudinal direction X in a plan view as shown in FIG. 16, and extends from the ventral side 1F to the back side 1R including the crotch 1M. The absorbent body 4 includes a liquid-retaining absorbent core 140 containing an absorbent material, and a core wrap sheet 45 that covers the skin facing surface 40a and the non-skin facing surface 40b of the absorbent core 140. Yes. The absorbent core 140 and the core wrap sheet 45 are joined by a known joining means such as a hot-melt adhesive. The absorbent body 4 (absorbent core 140) is formed symmetrically with respect to a virtual straight line (not shown) extending in the longitudinal direction X by dividing the diaper 200 in the transverse direction Y.

The absorbent core 140 has a single-layer structure, and has an hourglass shape in which the central portion in the longitudinal direction, that is, the longitudinal direction X is bound inward in a plan view as shown in FIG. The absorbent core 140 is formed by stacking a core forming material including an absorbent material. As the absorbent material, those normally used as a material for forming this type of absorbent core can be used without any particular limitation. For example, hydrophilic fibers such as wood pulp, synthetic fibers treated with a hydrophilizing agent, and water absorption Include polymer particles. That is, the absorbent core 140 can be a hydrophilic fiber stack, or a structure in which water-absorbing polymer particles are supported on the stack.

As the core wrap sheet 45, a water-permeable sheet material can be used, and for example, paper, nonwoven fabric, or the like can be used. In the diaper 200 of the present embodiment, the core wrap sheet 45 is a single continuous core wrap sheet 45 having a width that is not less than 2 times and not more than 3 times the length of the absorbent core 140 in the lateral direction Y. As shown in FIG. 17, the single core wrap sheet 45 covers the entire area of the skin facing surface 40 a of the absorbent core 140, and from the side edges along the longitudinal direction X of the absorbent core 140 to the outside in the lateral direction Y. The extending portion is wound down below the absorbent core 140 to cover the entire area of the non-skin facing surface 40b of the absorbent core 140. The form of the core wrap sheet 45 is not limited to this. For example, the skin side core wrap sheet covering the skin facing surface 40a of the absorbent core 140 and the non-skin facing surface 40b of the absorbent core 140 are not covered. The skin side core wrap sheet may be included, and both sheets may be separate sheets.

The absorbent body 4 is located in the center portion of the absorbent core 140 in the lateral direction Y and extends in the longitudinal direction X, and is located on both sides of the core low stiffness region 40L in the lateral direction Y. It has a core high-rigidity region 40H having higher rigidity than the low-rigidity region 40L.
The core low-rigidity region 40L is a region in which a plurality of linear grooves 141 are formed in a lattice shape in a plan view as shown in FIG. 16, and extends from the ventral side portion 1F to the back side portion 1R including the crotch portion 1M. is doing. The overall length in the longitudinal direction X of the core low-rigidity region 40L is shorter than that of the absorbent core 140, and the pair of grooves 141, 141 located at the outermost side in the longitudinal direction X are in the longitudinal direction X of the absorbent core 140. It is located inward in the vertical direction X from the front and rear ends. The length in the lateral direction Y of the core low-rigidity region 40L, that is, the length between the pair of grooves 141 and 141 located on the outermost side in the lateral direction Y is constant over the entire length in the longitudinal direction X of the region 40L. .
On the other hand, the core high rigidity region 40H is a region other than the core low rigidity region 40L in the absorbent core 140, and surrounds the core low rigidity region 40L.

In the diaper 200 of this embodiment, the core low-rigidity region 40L has a lower basis weight than the core high-rigidity region 40H. Therefore, the core low-rigidity region 40L has a lower rigidity than the core high-rigidity region 40H. . The reason why the basis weight of the core low rigidity region 40L is lower than that of the core high rigidity region 40H is that grooves 141 are formed on the non-skin facing surface 40b of the core low rigidity region 40L as shown in FIGS. Because it is. The core high rigidity region 40H is not formed with a recess such as the groove 141. In the core high rigidity region 40H, the skin facing surface 40a and the non-skin facing surface 40b are flat.

The groove 141 is a recess formed by intentionally reducing the amount of the core forming material including the absorbent material as compared with the peripheral portion in a known absorbent core manufacturing method using a fiber stacking apparatus. It is not a so-called embossed groove, that is, a recess formed by embossing (pressing process) a flat plate-like absorbent core having a uniform basis weight and no irregularities on the surface. Accordingly, the normal embossed groove has a higher density than the peripheral portion because the core forming material is consolidated by embossing, but the groove 141 is not consolidated in the formation process, and therefore the peripheral portion thereof. There is no substantial difference in density in comparison with (non-grooved portion).

A known method for manufacturing an absorbent core that can be used to form the groove 141 is, for example, a method for forming a concave portion for accumulation formed on an outer surface of a fiber stacking apparatus (rotary drum or the like) by supplying a core forming material supplied on an air flow. In this step, the step of depositing at the bottom is used, and in such a step, the concave portion for accumulation having a partially different opening rate of the bottom is used. Specifically, the opening of the bottom corresponding to the formation site of the groove 141 is used. By using the concave portion for accumulation whose rate is adjusted to be relatively low, the core low-rigidity region 40L in which the groove 141 is formed and the core high-rigidity region 40H in which the groove (concave portion) is not formed are provided. Absorbent core 140 can be formed. In the absorbent core 140 formed in this way, as shown in FIGS. 16 and 17, the portion where the amount of core forming material is relatively small becomes the low basis weight portion 142 located at the portion where the groove 141 is formed. The portion having a relatively large amount of core forming material is the high basis weight portion 143 which is a portion where grooves (concave portions) are not formed.

The core low-rigidity area 40L is relatively adjacent to the high basis weight part 143 having a relatively high basis weight and a convex shape protruding toward the non-skin facing surface 40b, and the high basis weight part 143. It has a low basis weight portion 142 having a low basis weight and recessed toward the skin facing surface 40a, and the high basis weight portion 143 and the low basis weight portion 142 are integrally formed. And the groove | channel 141 which makes the core low rigidity area | region 40L make low basic weight and low rigidity in contrast with the core high rigidity area | region 40H is formed in the non-skin opposing surface 40b side in the formation position of the low basic weight part 142. It is a concave part. That is, the low basis weight portion 142 that is the formation site of the groove 141 has a lower basis weight and a smaller thickness than the high basis weight portion 143 that is the non-formation site of the groove (concave portion) in the core low rigidity region 40L. .

In the core low rigidity region 40L, as shown in FIG. 17, the non-skin facing surface 40b has a concavo-convex structure due to the presence of the plurality of grooves 141, whereas the skin facing surface 40a has such a groove. It does not have (concave part) and is flat. As described above, when the non-skin facing surface 40b side of the absorbent core 140 has a concavo-convex structure, the absorbent core 140 is easily deformed flexibly by an external force applied to the absorbent core 140, so that the fit of the diaper 200 is improved. .

In the core low-rigidity region 40L, as shown in FIGS. 16 and 17, a plurality of linear grooves 141 extend in the vertical direction X, and a plurality of linear grooves 141 also extend in the horizontal direction Y. The core low-rigidity region 40L is divided into a plurality of small regions by the plurality of linear grooves 141, that is, the low basis weight portions 142 that extend in this manner and are orthogonal to each other, and the small regions are divided into the high basis weight portions 143. It is. That is, each high basic weight part 143 is divided by the low basic weight part 142 (groove 141), and is independent. The plurality of high basis weight portions 143 have substantially the same shape, and each has a rectangular shape in plan view, and the length in the vertical direction X is longer than the length in the horizontal direction Y. On the other hand, with respect to the low basis weight portion 142, the low basis weight portion 142 extends in both the vertical direction X and the horizontal direction Y and is connected to each other to form a continuous body. The width of the low basis weight portion 142 extending in the longitudinal direction X (the length in the direction orthogonal to the length direction) and the width of the low basis weight portion 142 extending in the lateral direction Y may be the same or different. Also good.

As described above, the core low-rigidity region 40L has a block structure having a large number of block regions including the high basis weight portion 143 and the linear low basis weight portion 142 that surrounds the high basis weight portion 143 over the entire circumference thereof. Each block area is individually independent. As shown in FIG. 16, the outermost periphery of the block structure is formed by a low basis weight portion 142. And the recessed part by the side of the non-skin opposing surface 40b of the absorptive core 140 in the formation position of the low basic weight part 142 is the groove | channel 141. FIG.

Due to the presence of the core low-rigidity region 40L having such a block structure, the absorbent core 140 becomes flexible in both the vertical direction X and the horizontal direction Y, and as a result, the absorbent core 140 is worn by the wearer. It becomes easy to follow the shape of the body. Furthermore, excretion fluid such as urine is guided by the relatively thin low basis weight portion 142 and flows therethrough, so that the diffusibility of the absorbent core 140 in the vertical direction X and the horizontal direction Y can be improved.

The ratio of the basis weight of the low basis weight portion 142 to the basis weight of the high basis weight portion 143, that is, the basis weight of the low basis weight portion 142 / the basis weight of the high basis weight portion 143 is preferably 20% or more, and more preferably. 30% or more, and preferably 80% or less, more preferably 70% or less.
Low basis weight portion 142 basis weight of itself is preferably 100 g / m ² or more, more preferably 150 g / m ² or more, and, preferably 500 g / m ² or less, more preferably 400 g / m ² or less.
The basis weight of the high basis weight portion 143 itself is preferably 300 g / m ² or more, more preferably 350 g / m ² or more, and preferably 900 g / m ² or less, more preferably 800 g / m ² or less.
The basis weight is measured as follows.

<Measurement method of basis weight>
Cut along the boundary line between the low basis weight portion 142 and the high basis weight portion 143 in the absorbent core 140 using a single blade razor manufactured by Feather Corporation. Ten pieces of the high basis weight part 143 obtained by cutting were each measured using an electronic balance (Electronic balance GR-300 manufactured by A & D, accuracy: 4 digits after the decimal point). Find the average weight of the pieces. The calculated average weight is divided by the average area per piece of the high basis weight portion 143 to calculate the basis weight of the high basis weight portion 143. The basis weight of the core high-rigidity region 40H described later is calculated in the same manner as the basis weight of the high basis weight portion 143.
Next, along the boundary line extending in the longitudinal direction X of the diaper 200 among the boundary lines between the low basis weight portion 142 and the high basis weight portion 143, the length is 100 mm and the width is the design dimension of the width of the low basis weight portion 142. Then, five small pieces in the vertical direction X of the thin striped low basis weight portion 142 are cut out using a single-edged razor manufactured by Feather. Each of the 5 pieces obtained was measured using an electronic balance (Electronic balance GR-300 manufactured by A & D, accuracy: 4 digits after the decimal point), and averaged to obtain the average weight of one piece of the low basis weight 142. . The calculated average weight is divided by the average area per piece in the vertical direction X of the low basis weight portion 142 to calculate the basis weight in the vertical direction X of the low basis weight portion 142. For the horizontal direction Y of the low basis weight portion 142, the basis weight is calculated in the same manner as the vertical direction X of the low basis weight portion 142.

The high basis weight portion 143 is not only larger in basis weight than the low basis weight portion 142 but also thicker. The ratio of the thickness of the low basis weight portion 142 to the thickness of the high basis weight portion 143, that is, the thickness of the low basis weight portion 142 / the thickness of the high basis weight portion 143 is preferably 30% or more, more preferably 40% or more, And preferably it is 90% or less, More preferably, it is 80% or less.
The thickness of the low basis weight portion 142 itself is preferably 1.5 mm or more, more preferably 2.5 mm or more, and preferably 4.5 mm or less, more preferably 4 mm or less.
The thickness of the high basis weight portion 143 itself is preferably 2 mm or more, more preferably 3 mm or more, and preferably 8 mm or less, more preferably 7 mm or less.
The thickness is measured as follows.

<Method for measuring thickness>
A sample is cut into a predetermined size, the measurement site is pressurized at 5 kPa for 10 minutes, and measurement is performed immediately after dewetting. The number of measurement points is 3 points or more including one or more of each of the abdominal side, crotch, and back side per one sheet, and the thickness is obtained by averaging two samples (6 or more measurement points). For example, the diaper 200 is cut with a sharp razor in the longitudinal direction X or the transverse direction Y of the diaper 200, and the cross section of the cut sample is measured. If it is difficult to measure with the naked eye, the section of the cut sample may be observed and measured at a magnification of 20 to 100 times using, for example, a microscope (VHX-1000 manufactured by KEYENCE).

On the other hand, the core high-rigidity region 40H surrounds the entire outer periphery of the core low-rigidity region 40L having a block structure as shown in FIG. The core low-rigidity area 40L and the core high-rigidity area 40H are partitioned by a low basis weight portion 142 located on the outermost periphery of the core low-rigidity area 40L. In the core high-rigidity region 40H, the thickness and basis weight at an arbitrary position are constant.

As shown in FIG. 17, in the diaper 200 of the present embodiment, the thickness of the core high rigidity region 40H is substantially the same as the thickness of the high basis weight portion 143 of the core low rigidity region 40L. However, the relationship between the thickness of the core high rigidity region 40H and the thickness of the high basis weight portion 143 is not limited to this, and either one may be relatively large. Specifically, the thickness of the core high rigidity region 40H is preferably 2 mm or more, more preferably 3 mm or more, and preferably 8 mm or less, more preferably 7 mm or less. The method for measuring the thickness is as described above.

The low basis weight portion 142 and the high basis weight portion 143 of the core low rigidity region 40L are integrally formed as described above. In addition to this, the block region composed of the low basis weight portion 142 and the high basis weight portion 143 and the core high rigidity region 40H located on the outer periphery thereof are also integrally formed. In this specification, “integrated molding” means that a plurality of parts, for example, a low basis weight portion 142 and a high basis weight portion 143 are not separated from each other without using a bonding means such as an adhesive or heat fusion. It means that they are integrated so that they are integrally formed from the same material. When a plurality of parts of the absorbent core 140 are integrally formed, the urine or other excretory fluid has continuity that can move smoothly.

As described above, the core low-rigidity region 40L and the core high-rigidity region 40H are formed in the absorbent core 140. The core low-rigidity region 40L includes the low basis weight portion 142 that is the formation site of the groove 141 and the high basis weight. The core high-rigidity region 40H is hard because the thickness and basis weight are constant, while the core high-rigidity region 40H is flexible because it has a block structure composed of the amount portion 143. The rigidity is lower than that of the core high rigidity region 40H.

In this specification, “rigidity” refers to the degree of difficulty in bending the constituent members of absorbent articles such as absorbent cores and surface materials, and high rigidity means that the constituent members are difficult to bend. Say. The rigidity measurement method varies depending on the type of component, and the rigidity of the absorbent core can be evaluated by the bending rigidity measured by the following method. It can be evaluated that the smaller the measured value of the bending stiffness, the lower the rigidity of the measurement object, and the easier it is to bend.

<Measurement method of bending stiffness of absorbent core>
Remove the absorbent core from the absorbent article. The “absorbent core” herein includes a member mainly composed of an absorbent material such as pulp and water-absorbing polymer particles, and a so-called core wrap sheet that wraps the member. That is, strictly speaking, the measurement object of this method is not an absorbent core alone but an absorbent body further including a core wrap sheet. However, since the bending stiffness of the core wrap sheet is usually much smaller than that of the absorbent core, the measured value of the bending stiffness of the absorbent body can be regarded substantially as the measured value of the bending stiffness of the absorbent core itself. it can. If the absorbent article from which the absorbent core is taken out is a new article sealed in a packaging bag, the absorbent article taken out after opening the packaging bag is left at room temperature and normal pressure for 1 day or more, and then the absorbent core is removed. Take out. A predetermined measurement target part is cut out from the extracted absorbent core to obtain a measurement sample. For example, four rectangular portions having a length (width) 20 mm in the horizontal direction Y and a length 50 mm in the vertical direction X are cut out from the core low rigidity region 40L and the core high rigidity region 40H of the absorbent core 140 of the diaper 200, respectively. A measurement sample. More specifically, two rectangular portions are cut out from the ventral side portion 1F and the dorsal side portion 1R, respectively, from a position that is symmetrical in the lateral direction Y, and only the ventral side portion 1F or the dorsal side portion 1R is cut. Then, when the measurement sample cannot secure a predetermined size, it may be cut out across the crotch 1M.
For measurement of the bending rigidity of the measurement sample, a handle o meter can be used. For example, a texture tester (handle o meter method) “HOM-3 type” manufactured by Daiei Kagaku Seiki Seisakusho can be used. Place the measurement sample on the handle base of the handleometer so that the longitudinal direction of the measurement sample is perpendicular to the groove of 30 mm width carved on the support base, and the center of the measurement sample with a 2 mm thick blade Press and measure the force required at the time of pressing. For example, the bending stiffness is measured for each of the four measurement samples of the core low-rigidity region 40L and the core high-rigidity region 40H, and the average value of the measurement values of the four measurement samples is calculated for the region 40L or 40H. Bending rigidity.

The bending rigidity of the core low rigidity region 40L is preferably 3 g or more, more preferably 4 g or more, and preferably 10 g or less, more preferably 9 g or less.
The bending rigidity of the core high-rigidity region 40H is preferably 5 g or more, more preferably 6 g or more, and preferably 20 g or less, more preferably 15 g or less.
The difference in bending rigidity between the core low rigidity region 40L and the core high rigidity region 40H is preferably 1 g or more.
The bending stiffness in each of the regions 40L and 40H of the absorbent core 140 can be adjusted by appropriately adjusting the selection of the core forming material, the basis weight (arrangement form of the grooves 141 in the region 40L), and the like.

Hereinafter, the surface sheet 102 (surface material) will be described in detail.
In the plan view of the diaper 200 as shown in FIG. 16, the topsheet 102 overlaps with the core low-rigidity region 40L and extends in the vertical direction X, and the surface material low-rigidity region 2L in the lateral direction Y. The surface material high rigidity region 2H is located on both sides and has higher rigidity than the surface material low rigidity region 2L. In the diaper 200 of the present embodiment, the length or width in the lateral direction Y of the top sheet 102 is substantially the same as the width of the absorber 4.

As shown in FIG. 17, the surface material low-rigidity region 2L is located at the center in the lateral direction Y of the diaper 200, and a pair of surface material high- rigidity regions 2H, 2H is located. In the diaper 200 of the present embodiment, the pair of surface material high- rigidity regions 2H and 2H are formed symmetrically with respect to a virtual straight line (not shown) extending in the vertical direction X by dividing the diaper 200 into the horizontal direction Y. ing. The two regions 2L and 2H having different rigidity are preferably formed in at least the crotch 1M in the longitudinal direction X, and extend from the crotch 1M to one or both of the ventral side 1F and the back side 1R. It is preferable that it is formed, or it covers the full length of the absorber 4, and also it covers the full length of the diaper 200 in the vertical direction X as in this embodiment.

FIG. 18 shows the skin facing surface of the top sheet 102 in an enlarged manner. As shown in FIG.17 and FIG.18, the surface sheet 102 has the convex part 26 which protrudes toward a wearer's skin side, and the recessed part 25 which exists in the circumference | surroundings of the convex part 26, and the surface material low-rigidity area | region 2L. And the surface material high-rigidity region 2H have different formation patterns of the convex portions 26 and / or the recesses 25, the difference between the unevenness formation patterns is that the surface material low-rigidity region 2L and the surface material high-rigidity region 2H are different. This is one of the causes of the rigidity difference.

In the present specification, the expression “the projection pattern is different” includes both cases where only the arrangement of the projections is different, cases where the shape of the projections is different, and cases 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 diaper 200 of the present embodiment, as will be described later, the arrangement and form of the protrusions 26 are different between the surface material low-rigidity region 2L and the surface material high-rigidity region 2H. Further, the meaning of the expression “difference pattern of the recesses is different” is substantially the same as the expression “difference of the formation pattern of the protrusions”, and the description of the protrusions is appropriately applied.

The surface sheet 102 is formed by partially performing known embossing on the raw sheet that is the raw material. The embossed portion is formed by the material of the raw sheet being consolidated. The part which is formed into the concave part 25 and is not embossed protrudes to one side in the thickness direction, specifically the skin-facing surface side, and becomes the convex part 26, and the concave part 25 depends on the presence or absence of such embossing. Is a high density portion having a relatively high density, and the convex portion 26 is a low density portion having a relatively low density. In the surface sheet 102, the region where the proportion of the concave portions 25 is large (the proportion of the convex portions 26 is small) is usually harder and more difficult to bend.

As described above, since there is a density difference between the concave portion 25 and the convex portion 26, “the formation pattern of the concave portion 25”, for example, the shape of the concave portion in plan view, the area (embossed area), the position, etc. Both the “pattern”, for example, the shape, size, position, and the like of the convex portion 26 affect the rigidity of the topsheet 102. For example, even if the formation positions of the plurality of convex portions 26 are the same between two contrasting regions in the topsheet 102, if the area ratio of the concave portions 25 is different, the area ratio of the concave portions 25 is relatively large. Can be the surface material high-rigidity region 2H. In addition, even if the area ratio of the concave portion 25 is the same between the two regions to be compared, if the formation position of the convex portion 26 is different, a difference in rigidity occurs between the two regions, and the surface material low-rigidity region 2L And the surface material high rigidity region 2H may occur. Accordingly, in order to form a difference in rigidity between one part and the other part in one surface sheet 102 to form the surface material low rigidity region 2L and the surface material high rigidity region 2H, these one part and the other It is effective to make one or both of the formation pattern of the concave portion 25 and the formation pattern of the convex portion 26 different from each other.

The rigidity of each part of the surface sheet (surface material) can be evaluated by the bending rigidity measured by the following method. It can be evaluated that the smaller the measured value of the bending stiffness, the lower the rigidity of the measurement object, and the easier it is to bend.

<Measurement method of bending rigidity of surface sheet>
According to the ring crush method JIS P8126. Specifically, a predetermined measurement target part is cut out from the surface sheet to obtain a measurement sample. For example, from each of the surface material low-rigidity region 2L and the surface material high-rigidity region 2H of the surface sheet 102, a rectangular shape portion having a length of 30 mm in the vertical direction X and a length of 110 mm in the horizontal direction Y is cut out to obtain a test piece. The test piece is rounded into a cylindrical shape in the longitudinal direction of the test piece with the skin-facing surface of the test piece facing outward, and one end and the other end in the longitudinal direction of the test piece are fastened with an ultrasonic seal, A 30 mm cylindrical measurement sample is prepared. The produced cylindrical measurement sample is set up so that its axial direction coincides with the vertical direction, and the measurement sample is compressed in the axial direction from its upper end side at a compression speed of 10 mm / min using a compression tester. Record the maximum load shown at times. Five measurement samples are prepared for each measurement target part, and each maximum load is measured, and the average value thereof is bent in the measurement target part (for example, the surface material low rigidity region 2L or the surface material high rigidity region 2H). The stiffness value.

The ratio of the bending rigidity of the surface material high rigidity region 2H to the bending rigidity of the surface material low rigidity region 2L is preferably 1.1 or more, more preferably 1.2 or more as the latter / the former.
On the premise that the bending rigidity of the surface material high rigidity region 2H is larger than the bending rigidity of the surface material low rigidity region 2L, 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, preferably 10 cN or more and 50 cN or less, more preferably 15 cN or more and 40 cN or less.
On the assumption that the bending rigidity of the surface material low rigidity region 2L is smaller than that of the surface material high rigidity region 2H, 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, preferably 5 cN or more and 40 cN or less, more preferably 10 cN or more and 30 cN or less.

FIG. 19 shows an enlarged part of the surface material low-rigidity region 2L of the surface sheet 102, and FIG. 20 shows an enlarged part of the surface material high-rigidity region 2H of the surface sheet 102. Has been. The top sheet 102 in the diaper 200 of the present embodiment is a composite sheet made of a laminate of two sheets 20 and 21. In the surface sheet 102, the laminated first sheet 20 and second sheet 21 are partially bonded by embossing in both the regions 2L and 2H, and a plurality of bonding portions, that is, concave portions 25 (high density portions) are formed. The 1st sheet | seat 20 is formed, protrudes in the direction away from the 2nd sheet | seat 21 in site | parts other than the recessed part 25, and forms the convex part 26 (low-density part) which protrudes toward a wearer's skin side. Yes. In the recess 25, the two sheets 20, 21 are pressed together by embossing, and preferably, the heat between the sheets 20, 21 is caused by melting of the constituent resin of one or both sheets and subsequent solidification. Fused. In both the regions 2L and 2H, the surface sheet 102 has a substantially flat surface on the second sheet 21 side, and has large undulations on the first sheet 20 side.

The first sheet 20 and the second sheet 21 are made of a sheet material. As the sheet material, for example, a non-woven fabric such as an air-through nonwoven fabric or a spunbond nonwoven fabric, a fiber sheet such as a woven fabric, a knitted fabric, a film or the like can be used, and it is preferable to use a fiber sheet from the viewpoint of touch, In particular, it is preferable to use a nonwoven fabric. The types of sheet materials constituting both sheets 20 and 21 may be the same or different. The basis weight of the nonwoven fabric used as the sheet material constituting both sheets 20 and 21 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. m ² or less.

In the surface material low rigidity region 2L and the surface material high rigidity region 2H, the main difference regarding the formation pattern of the convex portion 26 is that the surface material low rigidity region 2L includes the convex portion 26 as shown in FIGS. As the (low density portion), the plurality of small convex portions 27A and 27B have the continuous convex portion 27 having a shape continuous in the lateral direction Y, whereas the surface material high rigidity region 2H has such a continuous convex shape. The convex part 26 has a point in which a plurality of convex parts 26H exist independently. *

In the surface material low-rigidity region 2L, as shown in FIGS. 17 to 19, a plurality of continuous convex portions 27 extending continuously in the horizontal direction Y are formed at predetermined intervals in the vertical direction X. The continuous convex portion 27 is formed by connecting a plurality of small convex portions 27A and 27B to each other. In this specification, “a convex portion is connected” means that two adjacent convex portions (small convex portions) are not separated by the concave portion 25 (joint portion), and a part of one convex portion. Is a part of the other convex part, and a part of the other convex part is a part of the one convex part.

Such presence of the continuous convex portion 27 extending continuously in the lateral direction Y greatly contributes to maintaining the three-dimensional structure of the topsheet 102 while the diaper 200 is worn. That is, while the diaper 200 is worn, especially in the crotch 1M, the outer sheet is compressed by applying external force from both sides in the lateral direction Y by the wearer's thigh. There is a concern that the three-dimensional structure composed of the concave portions 25 (high-density portions) and the convex portions 26 (low-density portions) 102 is crushed, and the effects that can be originally achieved by such three-dimensional structures are not achieved. For example, in the case where a continuous convex portion (not shown) extending in the longitudinal direction X is formed on the top sheet 102, that is, a continuous convex portion that is 90 ° different in the extending direction from the continuous convex portion 27, the continuous convex portion When compressed from the lateral direction Y, the plurality of small convex portions constituting the continuous convex portion are respectively compressed in the horizontal direction Y, and therefore the degree of deformation due to compression of the continuous convex portion as a whole is relatively large. Become. On the other hand, since the continuous convex part 27 is extended in the horizontal direction Y which is easy to be compressed during wearing of the diaper 200, it is hard to be crushed even if it is compressed by an external force applied from both sides in the horizontal direction Y. Easy to maintain. Accordingly, the continuous convex portion 27 extending continuously in the lateral direction Y is formed on the surface sheet 102, so that the texture inherent to the surface sheet 102 is easily maintained, and the skin contact with the wearer's crotch, liquid leakage, etc. In this respect, improvement in performance can be expected.

In the present embodiment, the continuous convex portion 27 is formed by alternately connecting two types of small convex portions 27A and 27B having different heights in the horizontal direction Y, as shown in FIGS. The small convex portion 27A has a relatively high height, and the small convex portion 27B has a relatively low height. Both the convex portions 27A and 27B have a substantially circular shape in plan view, and have a shape having a top portion in a cross section in any of the vertical direction X and the horizontal direction Y. The continuous convex portion 27 is hollow, and the hollow portion continuously extends over substantially the entire length in the lateral direction Y of the continuous convex portion 27.
In addition, in this embodiment, although the continuous convex part 27 is continuing over the full length of the horizontal direction Y of 2 L of surface material low rigidity area | regions, the form of the continuous convex part 27 is not limited to this. For example, a plurality of continuous convex portions 27 are linearly arranged in a row at a predetermined interval in the lateral direction Y, and the convex portion row composed of the plurality of continuous convex portions 27 extends across the surface material low-rigidity region 2L. It may be made to cross in the direction Y.

As shown in FIGS. 18 and 19, the surface material low-rigidity region 2 </ b> L is formed as a convex portion 26 (low density portion) in addition to the continuous convex portion 27, and the periphery thereof is a concave portion 25 (high density portion), that is, the sheets 20, 21. A plurality of convex portions 26 </ b> L surrounded by the joint portions. Each convex portion 26L is formed in a region surrounded by a total of six concave portions 25, and has a shape having a top portion in the cross section in any of the vertical direction X and the horizontal direction Y. Each convex portion 26 </ b> L is lower in height than the small convex portions 27 </ b> A (small convex portions having a relatively high height) constituting the continuous convex portion 27. In addition, in this embodiment, each convex part 26L is hollow, but it may not be a hollow structure but may be a solid structure in which the material for forming the topsheet 102 is filled.

In the surface material low-rigidity region 2L, as shown in FIGS. 18 and 19, a plurality of convex portions 26L are linearly arranged in a row at predetermined intervals in the lateral direction Y to form the convex portion rows. It is composed. A plurality of small convex portions 27B (small convex portions having relatively low heights) constituting the continuous convex portion 27 are arranged in a straight line at predetermined intervals in the lateral direction Y. A convex row is formed. And the convex part row | line | column by the some convex part 26L and the continuous convex part 27 are arrange | positioned alternately and linearly along the vertical direction X, and one convex part 26L and one small convex part 27B are provided. Are formed at the same position in the lateral direction Y.

As shown in FIGS. 17, 18, and 20, the surface material high-rigidity region 2 </ b> H has a plurality of convex portions 26 </ b> H surrounded by concave portions 25 (high-density portions), that is, joint portions of the sheets 20 and 21. Yes. Each convex portion 26 </ b> H is formed in a region surrounded by a total of six concave portions 25, and has a shape having a top portion in a cross section in any of the vertical direction X and the horizontal direction Y. Each convex portion 26 </ b> H is lower in height than the small convex portions 27 </ b> A (small convex portions having a relatively high height) constituting the continuous convex portion 27. In addition, in this embodiment, each convex part 26H is hollow, However, The solid structure with which the formation material of the surface sheet 102 was filled inside may be sufficient instead of a hollow structure.

In the surface material high-rigidity region 2H, the convex portions 26H are formed in the form of dotted dots in a plan view, more specifically, in a staggered manner, as shown in FIGS. That is, in the surface material high-rigidity region 2H, a plurality of convex portions rows in which a plurality of convex portions 26H are linearly arranged at predetermined intervals in the horizontal direction Y are arranged in a plurality of rows in the vertical direction X. In the lateral direction Y, the convex portions 26H are shifted from each other between the adjacent convex portion rows. In other words, in the surface material high-rigidity region 2H, a plurality of convex portions rows in which a plurality of convex portions 26H are linearly arranged at predetermined intervals in the vertical direction X are respectively expressed in the vertical direction X. Between the projected images of the respective convex portions 26H in the specific convex portion row (for example, an intermediate position between two convex portions 26H and 26H adjacent to each other in the specific convex portion row). In addition, the plurality of convex portions 26H are arranged in a staggered manner so that the projected images of the convex portions 26H in another convex portion row adjacent to the specific convex portion row in the lateral direction Y are arranged.

The surface sheet 102 having the above-described configuration can be manufactured, for example, according to the method for manufacturing a composite sheet described in JP-A-2015-112343. Specifically, for example, the belt-shaped first sheet 20 is supplied between a first roll and a second roll whose peripheral surfaces are in mesh with each other, and the first sheet 20 is deformed into an uneven shape. Thereafter, the first sheet 20 is moved from the meshing portion along the peripheral surface portion of the first roll, and then the second sheet 21 is supplied so as to be superimposed on the first sheet 20, so that both sheets 20, 21 are Between the convex part and the heat roll in one roll, it is sandwiched by heating and partially joined. At that time, the concave and convex shapes of the first roll and the second roll at the central part and the side part of the first sheet 20. And the pattern of the joint formed by the first roll and the heat roll are made different. When the first sheet 20 is deformed into a concavo-convex shape by being engaged with the meshing portion of the first roll and the second roll, the first sheet 20 is sucked toward the inside of the roll, and the first sheet 20 It is preferable to promote the deformation to the uneven shape.

As one of the main features of the diaper 200 of the present embodiment, as shown in FIGS. 16 and 17, the surface material 102 has a surface material low-rigidity region that extends in the longitudinal direction X so as to overlap the core low-rigidity region 40 </ b> L in plan view. 2L and the surface material high rigidity region 2H located on both sides in the lateral direction Y, and the surface material high rigidity region 2H and the core high rigidity region 40H overlap in plan view. That is, in the diaper 200, the surface material low rigidity region 2 </ b> L having relatively low rigidity in the top sheet 102 and the core low rigidity region 40 </ b> L having relatively low rigidity in the absorbent core 140 are formed in the lateral direction Y of the diaper 200. In the thickness direction in the center portion of the surface sheet 102, the surface material high rigidity region 2H having relatively high rigidity in the surface sheet 102, and the core high rigidity region 40H having relatively high rigidity in the absorbent core 140, The diaper 200 overlaps in the thickness direction on both sides in the lateral direction Y. That is, when the surface material high rigidity region 2H is projected in the thickness direction of the diaper 200, at least a part of the region 2H overlaps with the core high rigidity region 40H, and the surface material low rigidity region 2L of the diaper 200 When projected in the thickness direction, at least a part of the region 2L overlaps the core low-rigidity region 40L.

In the diaper 200, as will be described later, the boundary between the core low-rigidity region 40L and the core high-rigidity region 40H (a pair of grooves 141, 141 located on the outermost side in the lateral direction Y) extends over its entire length in plan view. Since the surface material low-rigidity region 2L and the surface material high-rigidity region 2H overlap each other, the surface material low-rigidity region 2L and the core low-rigidity region 40L entirely overlap in plan view (see FIG. 16 and FIG. 16). FIG. 17). Further, as described above, since both side edges 2S, 2S of the topsheet 102 coincide with both side edges along the vertical direction X in the maximum width portion of the absorbent core 140, the entire core high rigidity region 40H is the surface material. It overlaps with the high rigidity region 2H in plan view.

In this way, the central portion in the lateral direction Y of the diaper 200 (particularly the central portion in the lateral direction Y of the absorbent core 140) where the surface material low-rigidity region 2L and the core low-rigidity region 40L overlap each other is relatively Both sides of the central portion (especially both sides in the lateral direction Y of the absorbent core 140) where the surface material high rigidity region 2H and the core high rigidity region 40H overlap each other are relatively high. When the diaper 200 is rigid, the center part is crushed and deformed relatively greatly when compressed by the wearer's thighs from both sides in the lateral direction Y. Since it is difficult to be crushed and the degree of deformation is relatively small, it is easy to maintain the three-dimensional structure originally possessed by the surface material high-rigidity region 2H of the topsheet 102 and the core high-rigidity region 40H of the absorbent core 140 that exist on both sides. Thus, while wearing the diaper 200, the three-dimensional structure of the both sides in the lateral direction Y is maintained without being substantially crushed, so that the skin contact of the crotch 1M is improved and the wearer excretes. Leakage is effectively prevented because so-called liquid jumping, in which excretion liquid such as urine excreted from the part to the crotch part 1M scatters to an unexpected part, is suppressed.

From the viewpoint of more surely exhibiting the operational effect due to the overlap between the surface material high rigidity region 2H and the core high rigidity region 40H (the overlap between the surface material low rigidity region 2L and the core low rigidity region 40L). The ratio of the area of the overlapping portion with the one in the surface material high-rigidity region 2H that overlaps one of the total area of one of the pair of core high- rigidity regions 40H and 40H is preferably 50% or more, Preferably it is 70% or more. From the same viewpoint, the ratio of the area of the overlapping portion with the surface material low-rigidity region 2L in the total area of the core low-rigidity region 40L is preferably 60% or more, and more preferably 80% or more. In the diaper 200 of the present embodiment, the ratios are all 100%.

In particular, in the diaper 200 of the present embodiment, as described above, the continuous convex portion 27 extending continuously in the lateral direction Y is formed in the surface material low-rigidity region 2L existing in the central portion of the diaper 200 in the lateral direction Y. Therefore, although the surface material low-rigidity region 2L is easily compressed during wearing of the diaper 200 due to the influence of the core low-rigidity region 40L that overlaps the surface material low-rigidity region 2L in the thickness direction, the surface material low-rigidity region 2L originally has The three-dimensional structure is easily maintained. Therefore, the texture inherent to the topsheet 102 is easily maintained, and further improvement in performance can be expected in terms of skin contact with the wearer's crotch, leakage, and the like.

From the viewpoint of more surely exhibiting the effects of the surface sheet 102 and the absorbent core 140 as described above, the core low rigidity region 40L occupying the entire area of the skin facing surface 40a of the absorbent core 140. The ratio of the area of the skin facing surface 40a in the (block structure forming region) is preferably 20% or more, more preferably 30% or more, and preferably 70% or less, more preferably 60% or less.

In the diaper 200 of the present embodiment, as shown in FIG. 18, a plurality of convex portions 26 (26L, 27) are intermittently formed in the longitudinal direction X at a predetermined pitch P4 in the surface material low-rigidity region 2L. In addition, as shown in FIG. 16, a plurality of grooves 141, that is, low basis weight portions 142 in the core low rigidity region 40 </ b> L are intermittently formed in the vertical direction X at a predetermined pitch P <b> 5. From the viewpoint of improving the fit, the ratio of the pitch P5 to the pitch P4 is preferably 2 or more, more preferably 3 or more, and preferably 7 or less, more preferably 6 or less, as pitch P5 / pitch P4. .

Moreover, from the viewpoint of making the above-described effects by the continuous projection 27 more reliable, the pitch P6 (see FIG. 18) of the continuous projection 27 is preferably 3 mm or more, and more preferably 4 mm. Above, and preferably 9 mm or less, more preferably 8 mm or less.

Further, in the diaper 200 of the present embodiment, a pair of grooves 141 and 141 located at the outermost boundary in the lateral direction Y between the core low rigidity region 40L and the core high rigidity region 40H in a plan view as shown in FIG. ) Overlaps the boundary 28 between the surface material low-rigidity region 2L and the surface material high-rigidity region 2H. That is, when the groove 141 forming the boundary between the region 40L and the region 40H in the absorbent core 140 is projected in the thickness direction of the diaper 200, at least a part of the groove 141 is the region 2L and the region 2H in the topsheet 102. It overlaps with the boundary 28. In the diaper 200, the groove 141 and the boundary 28 overlap with each other over their entire length. With such a configuration, when the diaper 200 is being worn and is compressed from the outside in the lateral direction Y by the wearer's thigh, a bent portion is easily formed at the overlapping portion of both the boundaries 28 and 141, thereby The three-dimensional structure of the constituent members (surface material high rigidity region 2H, core high rigidity region 40H) existing on both sides in the lateral direction Y of the diaper 200 is easily maintained, and the central portion (surface material low) of the diaper 200 in the lateral direction Y is easily maintained. The rigid region 2L and the core low-rigid region 40L) are easily bent and deformed.

In the diaper 200 of the present embodiment, the boundary 28 between the surface material low rigidity region 2L and the surface material high rigidity region 2H in the surface sheet 102, and the core low rigidity region 40L and the core high rigidity region 40H in the absorbent core 140 are provided. And the boundary (a pair of grooves 141 and 141 located at the outermost side in the lateral direction Y) overlaps the entire length of both the boundaries 28 and 141, but as in the other embodiment shown in FIG. The boundary 28 in the sheet 102 and the boundary in the absorbent core 140 (the outermost groove 141 in the lateral direction Y) may partially overlap. FIG. 21 shows an absorbent core 40A according to another embodiment of the absorbent article of the present invention (second invention). In addition, about other embodiment shown in FIG. 21, the structure part different from the diaper 200 mentioned above is mainly demonstrated, the same structure part attaches | subjects the same code | symbol, and abbreviate | omits description. The description of the diaper 200 is applied as appropriate to components that are not particularly described in the other embodiment shown in FIG.

In the other embodiment shown in FIG. 21, the dotted line indicated by reference numeral 28 is a boundary between the surface material low-rigidity region 2L and the surface material high-rigidity region 2H (not shown) and extends in the vertical direction over the entire length in the vertical direction X of the absorbent core 40A. X extends. As shown in FIG. 21, in the ventral side portion 1F and the dorsal side portion 1R, the boundary between the core low-rigidity region 40L and the core high-rigidity region 40H, that is, in the ventral side portion 1F and the dorsal side portion 1R, A pair of grooves 141 and 141 located outward are located outward in the lateral direction Y from the boundary 28 between the surface material low-rigidity region 2L and the surface material high-rigidity region 2H. A pair of grooves 141 and 141 located at the outermost side in the lateral direction Y at the boundary between the region 40L and the core high-rigidity region 40H, that is, at the crotch 1M, are located inward in the lateral direction Y from the boundary 28 in the topsheet 102. is doing. The effect similar to the diaper 200 mentioned above is show | played also by other embodiment shown in FIG.

As mentioned above, although this invention (1st invention) was demonstrated based on the preferable embodiment, this invention (1st invention) is not restrict | limited to the said embodiment. For example, as the surface sheet of the absorbent article, the first joint portion 31 and the second joint portion 32 in the central region M of the composite sheet 10 described above have the same width in the second direction Y and are spaced in the second direction Y. They may be opened alternately and arranged at equal intervals.

Further, the elastic member 19 for contracting the absorbent article in the width direction of the article, which is the width direction thereof, is only in the central portion of the back side in the width direction, for example, only in the rectangular frame shown as the elastic member arrangement region in FIG. It may be arranged. Further, the number of elastic members arranged in the elastic member arrangement region BM may be only two.
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.

Further, the absorbent article of the present invention (first invention) may be a pants-type (pull-on-type) disposable diaper instead of the unfolded disposable diaper. These may be sanitary napkins, incontinence pads, panty liners, and the like.

Although the present invention (second invention) has been described, the present invention (second invention) is not limited to the above-described embodiment, and can be appropriately changed without departing from the gist of the present invention (second invention). . For example, in order to prevent the excretion fluid from transferring from the absorbent core 140 to the wearer's skin (so-called liquid return), a sublayer or the like is provided between the topsheet 102 and the absorbent body 4 (core wrap sheet 45). A fluid-permeable bodily fluid backflow prevention layer, also called a liquid-permeable body fluid, may be interposed. Moreover, although the surface sheet 102 in the said embodiment was comprised from the laminated body of the two sheets 20 and 21, you may be comprised from one sheet.

The absorbent article of the present invention (second invention) is not limited to the deployable disposable diaper as in the above embodiment, but is used to absorb body fluid (urine, menstrual blood, loose stool, sweat, etc.) discharged from the human body. Articles are widely included, including pants-type disposable diapers, sanitary napkins, sanitary shorts, and the like.

In relation to the above-described embodiment, the present invention (first invention) further discloses the following absorbent article.
<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 central first convex portion that is the largest convex portion in the central region has a higher height than the side first convex portion that is the largest convex portion in the side region,
The absorbent article in which the amount of compressive deformation in the central region is larger than the amount of compressive deformation in the side region.

<2>
A plurality of central continuous convex portions including the central first convex portion are formed in the central region, and the convex portions are formed in a dotted shape in the side region, The absorbent article as described in <1>.
<3>
In the central region, a plurality of central continuous convex portions are formed,
In the central continuous convex portion, the central first convex portion and the central second convex portion whose height is lower than the central first convex portion are alternately connected, or only the central first convex portion is plural. The absorbent article according to <1> or <2>, which is continuous.
<4>
Each of the central continuous protrusions extends along the second direction,
The first side protrusions in the side region are parallel to each other in the composite sheet in the side region and have a plurality of first virtual straight lines parallel to each other and an angle between the first virtual straight lines. Absorption according to the above <2> or <3>, which is located at each intersection of the first virtual line and the second virtual line when a plurality of second virtual lines are assumed. Sex goods.
<5>
A central third convex portion having a height lower than that of the central first convex portion is formed in the central region,
The central third convex portions are positioned in the first direction between the central first convex portions, and the height thereof is equal to the height of the side first convex portions. <1> to < The absorbent article according to any one of 4>.

<6>
A central third convex portion having a height lower than that of the central first convex portion is formed in the central region,
A plurality of the central third convex portions are formed along the second direction, and a vertically long joint portion having a long shape in the first direction is formed between adjacent central third convex portions in the second direction. The absorbent article according to any one of <1> to <5>.
<7>
The height of the central first protrusion is preferably 105% or more, more preferably 110% or more, and preferably 200% or less, more preferably 150, with respect to the height of the side first protrusion. % Or less, the absorbent article according to any one of the above items <1> to <6>.
<8>
The height of the central first convex portion is preferably 0.5 mm or more, more preferably 1 mm or more, preferably 5 mm or less, more preferably 4 mm or less, any one of <1> to <7> Or an absorbent article according to claim 1.
<9>
The height of the first side convex portion is preferably 0.3 mm or more, more preferably 0.6 mm or more, preferably 4 mm or less, more preferably 3 mm or less, <1> to <8> The absorbent article according to any one of 1.

<10>
The difference between the height of the central first convex portion and the height of the side first convex portion is preferably 0.1 mm or more, more preferably 0.2 mm or more, and preferably 2 mm or less, more preferably 1 mm or less. The absorbent article according to any one of <1> to <9>, wherein
<11>
In the central region, a plurality of central continuous convex portions are formed,
The central first convex part constituting the central continuous convex part and the central second convex part having a lower height than the central first convex part have a cavity at least on the back side of the central first convex part 41. The absorbent article according to any one of <1> to <10>, which is preferable.
<12>
In the central region, a plurality of central continuous convex portions are formed,
There is a cavity on the back side of each of the central first convex portion and the central second convex portion that is lower than the central first convex portion constituting the central continuous convex portion, and the back surface of the central first convex portion And a cavity on the back surface of the central second convex part, and a continuous hollow part extending continuously in the second direction is formed on the back side of the central continuous convex part. The absorbent article according to any one of> to <11>.
<13>
A first joint section along the second direction is formed by a first joint section having a long side that coincides with the first direction and has a rectangular shape arranged in a line at intervals along the second direction. The absorbent article according to any one of <1> to <12>.
<14>
One side of two sides orthogonal to each other coincides with the second direction, the other side coincides with the first direction, and the second joints are arranged in a row at intervals along the second direction, thereby causing the second direction. The absorbent article according to any one of the above items <1> to <13>, wherein a second joint row along the line is formed.

<15>
The first joint portion along the second direction is formed by the first joint portions having the long sides coinciding with the first direction and having a rectangular shape arranged in a row at intervals along the second direction. And
One side of two sides orthogonal to each other coincides with the second direction, the other side coincides with the first direction, and the second joints are arranged in a row at intervals along the second direction, thereby causing the second direction. A second joint row R2 is formed along
In each first joint row, the arrangement interval of the first joint portions in the second direction is constant, and in each second joint row, the arrangement interval of the second joint portions in the second direction is 2 The absorbent article according to any one of <1> to <14>, wherein the absorbent article has various types of intervals, and alternately includes wide intervals and narrow intervals.
<16>
The first joint portion along the second direction is formed by the first joint portions having the long sides coinciding with the first direction and having a rectangular shape arranged in a row at intervals along the second direction. And
One side of two sides orthogonal to each other coincides with the second direction, the other side coincides with the first direction, and the second joints are arranged in a row at intervals along the second direction, thereby causing the second direction. A second joint row R2 is formed along
In each of the first joint rows, the arrangement positions of the first joints when viewed along the second direction are all the same, and each second joint row is also in the second direction. The absorbent article according to any one of <1> to <15>, wherein the arrangement positions of the second joints when viewed along the line are all the same.
<17>
The first joint portion along the second direction is formed by the first joint portions having the long sides coinciding with the first direction and having a rectangular shape arranged in a row at intervals along the second direction. And
One side of two sides orthogonal to each other coincides with the second direction, the other side coincides with the first direction, and the second joints are arranged in a row at intervals along the second direction, thereby causing the second direction. A second joint row R2 is formed along
When attention is paid to one of the first joints constituting the first joint row, a total of four second joints constituting two second joint rows are around the first joint, The absorbent article according to any one of <1> to <16>, wherein the absorbent article is disposed adjacent to each of the four corners of the first joint so as to face each other.
<18>
The first joint portion along the second direction is formed by the first joint portions having the long sides coinciding with the first direction and having a rectangular shape arranged in a row at intervals along the second direction. And
One side of two sides orthogonal to each other coincides with the second direction, the other side coincides with the first direction, and the second joints are arranged in a row at intervals along the second direction, thereby causing the second direction. A second joint row R2 is formed along
A group of joints composed of one first joint and four second joints located around the first joint is formed. In each embossed region E, a similar joint group is The absorbent article according to any one of <1> to <17>, wherein a plurality of the absorbent articles are formed at regular intervals along two directions.
<19>
The central region of the composite sheet includes the central first convex portion, the central second convex portion having a height lower than the central first convex portion, the central third convex portion, and the first sheet constituting the central sheet. A fourth protrusion is formed,
When attention is paid to the central second convex portion, the central third convex portion and the fourth convex portion which are lower in height than the central first convex portion, these three types of convex portions are the central second convex portion. And the fourth convex portion, the central third convex portion, and the fourth convex portion are arranged in this order regularly and linearly along the first direction, <1> to < The absorbent article according to any one of 18>.

<20>
The central region of the composite sheet includes the central first convex portion, the central second convex portion having a height lower than the central first convex portion, the central third convex portion, and the first sheet constituting the central sheet. A fourth convex portion is formed, and the fourth convex portion has a height lower than any of the central first convex portion, the central second convex portion, and the central third convex portion, The absorbent article according to any one of <1> to <19>.
<21>
In the side region of the composite sheet, a plurality of second direction joint rows in which the third joint portions are regularly arranged at two kinds of intervals along the second direction are formed in the first direction. The absorbent article according to any one of <1> to <20>.
<22>
The second direction joint line has a first distance and a second distance wider than the first distance as a distance between the third joints in the second direction. The absorption according to <21>, wherein the plurality of third joints in the two-way joint row are intermittently arranged in the second direction so as to have these two kinds of intervals alternately in the second direction. Sex goods.
<23>
The plurality of third joints constituting each of the second direction joint rows have the same length and arrangement position in the first direction, and are adjacent between the second direction joint rows adjacent in the first direction. The absorbent article according to <21> or <22>, in which a gap having a certain width is formed.
<24>
In the second direction joint line formed in a plurality of rows in the first direction, the arrangement positions of the third joints in the second direction coincide with each other, and the second direction joint lines adjacent to each other. The absorbent article according to any one of <21> to <23>, wherein the arrangement positions of the third joint portions in the second direction are different from each other.

<25>
As the second direction joint row, second direction first joint rows and second direction second joint rows in which the arrangement positions of the third joints in the second direction are different from each other alternately in the first direction. With respect to the arrangement position of the third joint portion in the second direction, the second direction first joint row and the second direction second joint row are adjacent to each other at the second interval on one side. The absorption according to any one of <21> to <24>, wherein a pair of the third joint portions adjacent to each other at a first interval in the other joint row is located between the third joint portions. Sex goods.
<26>
The composite sheet in the side region is assumed to be a plurality of first virtual lines parallel to each other and a plurality of second virtual lines parallel to each other having an angle between the first virtual lines. sometimes,
The angle θ formed by the first virtual line and the second virtual line is preferably 30 ° or more and 165 ° or less, more preferably 45 ° or more and 150 ° or less, and any one of the above items <1> to <25> 2. The absorbent article according to 1.
<27>
The composite sheet in the side region is assumed to be a plurality of first virtual lines parallel to each other and a plurality of second virtual lines parallel to each other having an angle between the first virtual lines. sometimes,
In the side region of the composite sheet, a plurality of third first convex portions arranged in series along the first imaginary straight line with a plurality of side first convex portions at regular intervals, and a plurality of the side portions Any one of the above items <1> to <26>, wherein the first protrusions are formed with a plurality of fourth direction protrusions arranged in series along the second imaginary straight line at regular intervals. Absorbent article as described in 1.
<28>
Between the adjacent third direction convex part rows, a third direction joint part row in which a plurality of joint pairs are arranged in series at a constant interval is formed, and between the adjacent fourth direction convex part rows. The absorbent article according to the above <27>, wherein a fourth direction joint row in which a plurality of joint pairs are arranged in series at a constant interval is formed.
<29>
A minute convex portion is formed in the side region,
The absorbent article according to any one of <1> to <28>, wherein the height of the minute convex portion is 1/3 or less of the first side convex portion.

<30>
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,
The central region of the composite sheet is arranged in an elastic member arrangement region in which the plurality of elastic members are arranged, and the elastic member arrangement region includes the central first convex portion. The protrusions are each formed in a plurality of rows extending in the second direction,
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 <29>.
<31>
In the central region, a plurality of central continuous convex portions are formed,
Any one of the above items <1> to <30>, wherein vertically long joints having a shape elongated in the first direction are formed at equal intervals in the second direction between the central continuous convex portions adjacent in the first direction. 2. The absorbent article according to 1.
<32>
The length of the first joint portion 31 that is a vertically long joint portion is preferably 1.2 times or more, particularly 1.5 times or more of the length along the second direction, and 5 times the length along the second direction. The absorbent article according to <31>, preferably not more than twice, particularly preferably not more than 3 times.
<33>
The first joint portion 31 that is a vertically long joint portion has a length along the first direction that is 1.2 times or more, particularly 1.5 times or more the length along the first direction of the second joint portion. The absorbent article according to <31> or <32>, preferably 5 times or less, particularly preferably 3 times or less.
<34>
The length along the first direction of the first joint which is a vertically long joint is preferably 0.5 mm or more, particularly preferably 1 mm or more, and is preferably 10 mm or less, particularly preferably 5 mm or less, <31> The absorbent article according to any one of <33>.

<35>
The second joints arranged in a line at intervals along the second direction with one side of the two sides orthogonal to each other aligned in the second direction and the other side in the first direction are arranged in the first direction. The length along the second direction is preferably 0.1 mm to 5 mm, particularly 0.5 mm to 3 mm, and the length along the second direction is 0.1 mm to 5 mm, particularly 0.5 mm to 3 mm. The absorbent article according to any one of <1> to <34>, which is preferably present.
<36>
The length of the third joint formed in the side region of the composite sheet along the first direction is preferably 0.1 mm or more and 5 mm or less, particularly preferably 0.5 mm or more and 3 mm or less, and in the second direction. The absorbent article according to any one of <1> to <35>, wherein the length along the length is preferably 0.1 mm to 5 mm, particularly preferably 0.5 mm to 3 mm.
<37>
The second direction joint line in which the third joints are regularly arranged at two kinds of intervals along the second direction has a gap between portions where the distance between the third joints in the second direction is large. It is preferably 2 times or more, particularly 2.5 times or more, and preferably 5 times or less, particularly preferably 4 times or less, with respect to the space between the third joints in the narrow space portion, <36 The absorbent article as described in>.
<38>
In the composite sheet, the surface on the second sheet side is substantially flat in both the central region and the side region, and irregularities having large undulations are formed on the first sheet side, <1> The absorbent article according to any one of ~ <37>.
<39>
Each of the central first convex portion and the central second convex portion constituting the central continuous convex portion formed in a plurality in the central region has a substantially circular shape in plan view, <1> to < The absorbent article according to any one of 38>.
<40>
In the central region of the composite sheet, a non-embossed region that extends in the second direction and does not have a joint portion continuously in the second direction, and extends in the second direction, the joint portions are regular. The absorbent article according to any one of <1> to <39>, wherein the embossed areas formed in a pattern are alternately formed in the first direction.

<41>
An absorbent body having an absorbent core containing an absorbent material, and a surface sheet disposed on the skin-facing surface side of the absorbent body, and a transverse direction perpendicular to the longitudinal direction corresponding to the wearer's front-rear direction An absorbent article having a direction,
The absorbent body is located in a laterally central portion of the absorbent core and extends in the longitudinal direction, and is located on both lateral sides of the core low stiffness area and compared to the core low stiffness area. Having a highly rigid core high rigidity region,
The top sheet is positioned on both sides in the lateral direction of the surface material low-rigidity region and overlaps with the core low-rigidity region in a plan view in comparison with the surface material low-rigidity region. The absorbent article according to <1>, further including a highly rigid surface material high-rigidity region, wherein the surface material high-rigidity region and the core high-rigidity region overlap in plan view.
<42>
The said core low-rigidity area | region is an absorbent article as described in said <41> whose basic weight is low compared with the said core high-rigidity area | region.
<43>
The core high-rigidity area is an area other than the core low-rigidity area in the absorbent core, and the absorbent article according to <41> or <42>, which surrounds the core low-rigidity area.

<44>
Grooves are formed on the skin-facing surface or non-skin-facing surface of the core low-rigidity region, and the groove-forming portion has a lower basis weight than the groove-non-forming portion of the core low-rigidity region. The absorbent article as described in 42> or <43>.
<45>
It has the abdominal side arranged on the abdomen side of the wearer and the dorsal side part arranged on the dorsal side and the crotch part located between them in the vertical direction,
The core low-rigidity region is a region in which a plurality of linear grooves are formed in a lattice shape in plan view, and extends from the ventral side portion to the dorsal side portion according to <44>. Absorbent article.
<46>
The core low-rigidity region has a shorter length in the longitudinal direction than the absorbent core, and the pair of grooves positioned at the outermost sides in the longitudinal direction are longer than the longitudinal front and rear ends of the absorbent core. The absorbent article according to <44> or <45>, which is located inward.
<47>
The lateral length of the core low-rigidity region, that is, the length between the pair of grooves located at the outermost sides in the lateral direction is constant over the entire length in the vertical direction of the core low-rigidity region <44> The absorbent article according to any one of ~ <46>.

<48>
The core low-rigidity region has a relatively high basis weight and a high basis weight portion having a convex shape protruding toward the non-skin facing surface side, and is adjacent to the high basis weight portion and relatively has a basis weight. Has a low basis weight part that is recessed toward the skin facing surface side,
The absorbent article according to any one of <44> to <47>, wherein the groove is a recess formed on a non-skin facing surface side at a position where the low basis weight portion is formed.
<49>
In the core low-rigidity region, the non-skin facing surface has an uneven structure due to the presence of the plurality of grooves, whereas the skin facing surface does not have the grooves and is flat <48>. Absorbent article as described in 1.
<50>
In the core low-rigidity region, a plurality of linear grooves extend in the vertical direction, and a plurality of linear grooves extend in the horizontal direction. The absorbent article according to <48> or <49>, wherein the core low-rigidity region is partitioned into a plurality of small regions by the groove, and the small region is the high basis weight portion.
<51>
The absorbent article according to any one of <48> to <50>, wherein each of the high basis weight parts is partitioned by the low basis weight part and is individually independent.

<52>
The ratio of the basis weight of the low basis weight part to the basis weight of the high basis weight part is preferably 20% or more, more preferably 30% or more, and preferably 80% or less, more preferably as the latter / the former. The absorbent article according to any one of <48> to <51>, which is 70% or less.
<53>
The basis weight of the low basis weight part is preferably 100 g / m ² or more, more preferably 150 g / m ² or more, and preferably 500 g / m ² or less, more preferably 400 g / m ² or less <48 The absorbent article according to any one of> to <52>.
<54>
The basis weight of the high basis weight part is preferably 300 g / m ² or more, more preferably 350 g / m ² or more, and preferably 900 g / m ² or less, more preferably 800 g / m ² or less <48 The absorbent article according to any one of> to <53>.
<55>
The high basis weight part is thicker than the low basis weight part, and the ratio of the thickness of the low basis weight part to the thickness of the high basis weight part is preferably 30% or more as the latter / the former. The absorbent article according to any one of <48> to <54>, more preferably 40% or more, and preferably 90% or less, and more preferably 80% or less.
<56>
The thickness of the low basis weight part is preferably 1.5 mm or more, more preferably 2.5 mm or more, and preferably 4.5 mm or less, more preferably 4 mm or less, any of the above <48> to <55> Or an absorbent article according to claim 1.
<57>
The absorption according to any one of <48> to <56>, wherein the thickness of the high basis weight part is preferably 2 mm or more, more preferably 3 mm or more, and preferably 8 mm or less, more preferably 7 mm or less. Sex goods.
<58>
The absorbent article according to any one of <48> to <57>, wherein a thickness of the core high rigidity region is substantially the same as a thickness of the high basis weight portion of the core low rigidity region.

<59>
The bending rigidity of the core low-rigidity region is preferably 3 g or more, more preferably 4 g or more, and preferably 10 g or less, more preferably 9 g or less, according to any one of the above items <41> to <58>. Absorbent article.
<60>
The bending rigidity of the core high-rigidity region is preferably 5 g or more, more preferably 6 g or more, and preferably 20 g or less, more preferably 15 g or less, according to any one of <41> to <59>. Absorbent article.
<61>
The absorbent article according to any one of <41> to <60>, wherein a difference in flexural rigidity between the core low-rigidity region and the core high-rigidity region is 1 g or more.

<62>
The top sheet has a convex portion protruding toward the wearer's skin side and a concave portion existing around the convex portion, and the convex portion and the top surface material low rigidity region and the top surface material high rigidity region. / Or the absorbent article according to any one of <44> to <61>, wherein the formation pattern of the recesses is different.
<63>
The absorbent article according to <62>, wherein the concave portion is a high-density portion subjected to embossing, and the convex portion is a low-density portion not subjected to embossing.
<64>
The absorbent article according to <62> or <63>, wherein, in the surface material high-rigidity region, the convex portions are formed in a plan view scattered dot shape, more specifically in a staggered shape.

<65>
The absorbent article according to any one of the above items <62> to <64>, wherein the surface material low-rigidity region includes a continuous convex portion having a shape in which a plurality of convex portions are connected in a lateral direction as the convex portion.
<66>
The absorbent article according to <65>, wherein the surface material high-rigidity region does not include the continuous convex portion, and the surface material high-rigidity region includes a plurality of the convex portions independently.
<67>
The absorbent article according to <65> or <66>, wherein the continuous convex portion is hollow, and the hollow portion continuously extends over substantially the entire length in the lateral direction of the continuous convex portion.
<68>
The absorbent article according to any one of <65> to <67>, wherein the continuous convex portion is formed by alternately connecting two types of small convex portions having different heights in the horizontal direction.
<69>
In the surface material low-rigidity region, a plurality of convex portions arranged by the convex portions and the continuous convex portions are alternately and linearly arranged along the vertical direction, and one convex portion and one convex portion are arranged. The absorbent article according to <68>, wherein the small convex portions are formed at the same position in the lateral direction.
<70>
The absorptivity according to any one of <65> to <69>, wherein the pitch of the continuous convex portions is preferably 3 mm or more, more preferably 4 mm or more, and preferably 9 mm or less, more preferably 8 mm or less. Goods.
<71>
In the surface material low rigidity region, the plurality of convex portions are intermittently formed at a predetermined pitch P4 in the vertical direction, and in the core low rigidity region, the plurality of grooves are intermittent in the vertical direction at a predetermined pitch P5. The ratio of the pitch P5 to the pitch P4 is preferably 2 or more, more preferably 3 or more, and preferably 7 or less, more preferably 6 or less as the pitch P5 / pitch P4. The absorbent article according to any one of 62> to <70>.

<72>
The ratio of the bending rigidity of the high-stiffness region of the surface material to the bending rigidity of the low-stiffness region of the surface material is preferably 1.1 or more, more preferably 1.2 or more as the latter / the former. 71> The absorbent article in any one of 71>.
<73>
On the assumption that the bending rigidity of the surface material high rigidity region is larger than the bending rigidity of the surface material low rigidity region, it is preferably 10 cN or more, more preferably 15 cN or more, and preferably 50 cN or less, more preferably 40 cN. The absorbent article according to any one of the above items <41> to <72>.
<74>
On the assumption that the bending rigidity of the surface material low rigidity region is smaller than the bending rigidity of the surface material high rigidity region, it is preferably 40 cN or less, more preferably 30 cN or less, and preferably 5 cN or more, more preferably 10 cN. The absorbent article according to any one of the above items <41> to <73>.

<75>
The ratio of the area of the skin facing surface of the core low-rigidity region to the total area of the skin facing surface of the absorbent core is preferably 20% or more, more preferably 30% or more, and preferably 70% or less, The absorbent article according to any one of <41> to <74>, more preferably 60% or less.
<76>
Any one of <41> to <75>, wherein a boundary between the core low-rigidity region and the core high-rigidity region overlaps a boundary between the surface material low-rigidity region and the surface material high-rigidity region in a plan view. Absorbent article as described in 1.
<77>
It has the abdominal side arranged on the abdomen side of the wearer and the dorsal side part arranged on the dorsal side and the crotch part located between them in the vertical direction,
In the ventral part and the dorsal part, the boundary between the core low rigidity region and the core high rigidity region is located laterally outward from the boundary between the surface material low rigidity region and the surface material high rigidity region. And
In the crotch part, the boundary between the core low-rigidity region and the core high-rigidity region is located inward in the lateral direction from the boundary between the surface material low-rigidity region and the surface material high-rigidity region. The absorbent article according to any one of 41> to <76>.
<78>
The absorbent article according to any one of <41> to <77>, wherein the absorbent core has a single-layer structure and has an hourglass shape in which a central portion in a longitudinal direction is bound inward in a plan view.

<79>
An absorbent body having an absorbent core containing an absorbent material, and a surface material disposed on the skin-facing surface side of the absorbent body, and a transverse direction perpendicular to the longitudinal direction corresponding to the wearer's front-rear direction. An absorbent article having a direction,
The absorbent body is located in a laterally central portion of the absorbent core and extends in the longitudinal direction, and is located on both lateral sides of the core low stiffness area and compared to the core low stiffness area. Having a highly rigid core high rigidity region,
The surface material is positioned on both lateral sides of the surface material low-rigidity region and overlaps with the core low-rigidity region in a vertical direction in a plan view, and compared to the surface material low-rigidity region. The absorbent article has a highly rigid surface material high rigidity region, and the surface material high rigidity region and the core high rigidity region overlap in plan view.

The absorbent article of the present invention (the first invention) is excellent in both air permeability and liquid drawability.

According to the present invention (second invention), there is provided an absorbent article that has good skin contact with the crotch, is excellent in wearing feeling, and is unlikely to cause liquid leakage.

Claims (78)

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 central first convex portion that is the largest convex portion in the central region has a higher height than the side first convex portion that is the largest convex portion in the side region,
   The absorbent article in which the amount of compressive deformation in the central region is larger than the amount of compressive deformation in the side region.
2. A plurality of central continuous convex portions including the central first convex portion are formed in the central region, and the convex portions are formed in a dotted pattern in the side region. Item 10. An absorbent article according to Item 1.
3. In the central region, a plurality of central continuous convex portions are formed,
   In the central continuous convex portion, the central first convex portion and the central second convex portion whose height is lower than the central first convex portion are alternately connected, or only the central first convex portion is plural. The absorbent article according to claim 1 or 2, which is continuous.
4. Each of the central continuous protrusions extends along the second direction,
   The first side protrusions in the side region are parallel to each other in the composite sheet in the side region and have a plurality of first virtual straight lines parallel to each other and an angle between the first virtual straight lines. The absorptive article according to claim 2 or 3 currently located in each intersection of said 1st virtual straight line and said 2nd virtual straight line when a plurality of 2nd virtual straight lines are assumed.
5. A central third convex portion having a height lower than that of the central first convex portion is formed in the central region,
   The central third convex portion has an arrangement position in the first direction located between the central first convex portions, and the height thereof is equal to the height of the side first convex portion. The absorbent article according to any one of the above.
6. A central third convex portion having a height lower than that of the central first convex portion is formed in the central region,
   A plurality of the central third convex portions are formed along the second direction, and a vertically long joint portion having a long shape in the first direction is formed between adjacent central third convex portions in the second direction. The absorbent article according to any one of claims 1 to 5.
7. The absorbent article according to any one of claims 1 to 6, wherein a height of the central first convex portion is 105% or more and 200% or less with respect to a height of the first side convex portion.
8. The absorbent article according to any one of claims 1 to 7, wherein a height of the central first convex portion is not less than 0.5 mm and not more than 5 mm.
9. The absorbent article according to any one of claims 1 to 8, wherein a height of the first side convex portion is not less than 0.3 mm and not more than 4 mm.
10. The absorbent article according to any one of claims 1 to 9, wherein a difference between a height of the central first convex portion and a height of the side first convex portion is 0.1 mm or more and 2 mm or less.
11. In the central region, a plurality of central continuous convex portions are formed,
    The central first convex portion constituting the central continuous convex portion and the central second convex portion having a height lower than that of the central first convex portion include a cavity on the back side of the central first convex portion 41. Item 11. The absorbent article according to any one of Items 1 to 10.
12. In the central region, a plurality of central continuous convex portions are formed,
    There is a cavity on the back side of each of the central first convex portion and the central second convex portion that is lower than the central first convex portion constituting the central continuous convex portion, and the back surface of the central first convex portion The continuous hollow part continuously extended along a 2nd direction is formed in the back side of the said center continuous convex part in the back side of the said central continuous convex part, and the cavity of the back surface of the said center 2nd convex part is formed. The absorbent article according to any one of 1 to 11.
13. The first joint portion along the second direction is formed by the first joint portions having the long sides coinciding with the first direction and having a rectangular shape arranged in a row at intervals along the second direction. The absorbent article according to any one of claims 1 to 12, wherein
14. One side of two sides orthogonal to each other coincides with the second direction, the other side coincides with the first direction, and the second joints are arranged in a row at intervals along the second direction, thereby causing the second direction. The absorbent article according to any one of claims 1 to 13, wherein a second joint row along the line is formed.
15. The first joint portion along the second direction is formed by the first joint portions having the long sides coinciding with the first direction and having a rectangular shape arranged in a row at intervals along the second direction. And
    One side of two sides orthogonal to each other coincides with the second direction, the other side coincides with the first direction, and the second joints are arranged in a row at intervals along the second direction, thereby causing the second direction. A second joint row is formed along
    In each first joint row, the arrangement interval of the first joint portions in the second direction is constant, and in each second joint row, the arrangement interval of the second joint portions in the second direction is 2 The absorbent article according to any one of claims 1 to 14, which has various kinds of intervals, and alternately has wide intervals and narrow intervals.
16. The first joint portion along the second direction is formed by the first joint portions having the long sides coinciding with the first direction and having a rectangular shape arranged in a row at intervals along the second direction. And
    One side of two sides orthogonal to each other coincides with the second direction, the other side coincides with the first direction, and the second joints are arranged in a row at intervals along the second direction, thereby causing the second direction. A second joint row is formed along
    In each of the first joint rows, the arrangement positions of the first joints when viewed along the second direction are all the same, and each second joint row is also in the second direction. The absorbent article according to any one of claims 1 to 15, wherein the arrangement positions of the second joints when viewed along the line are all the same.
17. The first joint portion along the second direction is formed by the first joint portions having the long sides coinciding with the first direction and having a rectangular shape arranged in a row at intervals along the second direction. And
    One side of two sides orthogonal to each other coincides with the second direction, the other side coincides with the first direction, and the second joints are arranged in a row at intervals along the second direction, thereby causing the second direction. A second joint row is formed along
    When attention is paid to one of the first joints constituting the first joint row, a total of four second joints constituting two second joint rows are around the first joint, The absorbent article according to any one of claims 1 to 16, wherein the absorbent article is disposed adjacent to each of the four corners of the first joint so as to face each other.
18. The first joint portion along the second direction is formed by the first joint portions having the long sides coinciding with the first direction and having a rectangular shape arranged in a row at intervals along the second direction. And
    One side of two sides orthogonal to each other coincides with the second direction, the other side coincides with the first direction, and the second joints are arranged in a row at intervals along the second direction, thereby causing the second direction. A second joint row is formed along
    A group of joints composed of one first joint and four second joints located around the first joint is formed. In each embossed region E, a similar joint group is The absorbent article according to any one of claims 1 to 17, wherein a plurality of the absorbent articles are formed at regular intervals along two directions.
19. The central region of the composite sheet includes the central first convex portion, the central second convex portion having a height lower than the central first convex portion, the central third convex portion, and the first sheet constituting the central sheet. A fourth protrusion is formed,
    When attention is paid to the central second convex portion, the central third convex portion and the fourth convex portion which are lower in height than the central first convex portion, these three types of convex portions are the central second convex portion. The first convex portion, the central third convex portion, and the fourth convex portion are regularly and linearly arranged along the first direction in this order. The absorbent article according to any one of the above.
20. The central region of the composite sheet includes the central first convex portion, the central second convex portion having a height lower than the central first convex portion, the central third convex portion, and the first sheet constituting the central sheet. A fourth convex portion is formed, and the fourth convex portion has a height lower than any of the central first convex portion, the central second convex portion, and the central third convex portion. Item 20. The absorbent article according to any one of Items 1 to 19.
21. In the side region of the composite sheet, a plurality of second direction joint rows in which the third joint portions are regularly arranged at two kinds of intervals along the second direction are formed in the first direction. The absorbent article according to any one of claims 1 to 20.
22. The second direction joint line has a first distance and a second distance wider than the first distance as a distance between the third joints in the second direction. The absorptivity according to claim 21, wherein the plurality of third joints in the two-way joint row are intermittently arranged in the second direction so as to have these two kinds of intervals alternately in the second direction. Goods.
23. The plurality of third joints constituting each of the second direction joint rows have the same length and arrangement position in the first direction, and are adjacent between the second direction joint rows adjacent in the first direction. 23. The absorbent article according to claim 21 or 22, wherein a gap having a certain width is formed in.
24. In the second direction joint line formed in a plurality of rows in the first direction, the arrangement positions of the third joints in the second direction coincide with each other, and the second direction joint lines adjacent to each other. The absorbent article according to any one of claims 21 to 23, wherein the arrangement positions of the third joint portions in the second direction are different from each other.
25. As the second direction joint row, second direction first joint rows and second direction second joint rows in which the arrangement positions of the third joints in the second direction are different from each other alternately in the first direction. With respect to the arrangement position of the third joint portion in the second direction, the second direction first joint row and the second direction second joint row are adjacent to each other at the second interval on one side. The absorbent article according to any one of claims 21 to 24, wherein a pair of the third joint portions adjacent to each other at a first interval in the other joint portion row is located between the third joint portions. .
26. The composite sheet in the side region is assumed to be a plurality of first virtual lines parallel to each other and a plurality of second virtual lines parallel to each other having an angle between the first virtual lines. sometimes,
    The absorbent article according to any one of claims 1 to 25, wherein an angle θ formed by the first imaginary straight line and the second imaginary straight line is not less than 30 ° and not more than 165 °.
27. The composite sheet in the side region is assumed to be a plurality of first virtual lines parallel to each other and a plurality of second virtual lines parallel to each other having an angle between the first virtual lines. sometimes,
    In the side region of the composite sheet, a plurality of third first convex portions arranged in series along the first imaginary straight line at a constant interval, and a plurality of side first convex portions, The side first convex portion is formed with a plurality of fourth direction convex portion rows arranged in series along the second imaginary straight line at regular intervals, according to any one of claims 1 to 26. The absorbent article as described.
28. Between the adjacent third direction convex part rows, a third direction joint part row in which a plurality of joint pairs are arranged in series at a constant interval is formed, and between the adjacent fourth direction convex part rows. The absorbent article according to claim 27, wherein a fourth direction joint row in which a plurality of joint pairs are arranged in series at a constant interval is formed.
29. A minute convex portion is formed in the side region,
    The absorbent article according to any one of claims 1 to 28, wherein a height of the minute convex portion is 1/3 or less of the side first convex portion.
30. 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,
    The central region of the composite sheet is arranged in an elastic member arrangement region in which the plurality of elastic members are arranged, and the elastic member arrangement region includes the central first convex portion. The protrusions are each formed in a plurality of rows extending in the second direction,
    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 to 29.
31. In the central region, a plurality of central continuous convex portions are formed,
    The longitudinally long joint portions having a shape that is long in the first direction are formed at equal intervals in the second direction between the central continuous convex portions adjacent in the first direction. The absorbent article as described.
32. 32. The absorbent article according to claim 31, wherein the first joint portion, which is a vertically long joint portion, has a length along the first direction that is 1.2 times or less that of the length along the second direction.
33. The length of the first joint portion, which is a vertically long joint portion, along the first direction is 1.2 times or less five times the length along the first direction of the second joint portion. The absorbent article as described.
34. The absorbent article according to any one of claims 31 to 33, wherein a length along the first direction of the first joint portion which is a vertically long joint portion is 0.5 mm or less and 10 mm or less.
35. The second joints arranged in a line at intervals along the second direction with one side of the two sides orthogonal to each other aligned in the second direction and the other side in the first direction are arranged in the first direction. The absorbent article according to any one of claims 1 to 34, wherein a length along the second direction is 0.1 mm or more and 5 mm or less, and a length along the second direction is 0.1 mm or more and 5 mm.
36. The third joint formed in the side region of the composite sheet has a length along the first direction of 0.1 mm to 5 mm, and a length along the second direction of 0.1 mm to 5 mm. The absorbent article according to any one of claims 1 to 35.
37. The second direction joint line in which the third joints are regularly arranged at two kinds of intervals along the second direction has a gap between portions where the distance between the third joints in the second direction is large. The absorptive article according to claim 36 which is 2 times or more and 5 times or less with respect to a space between said 3rd joined parts of a portion with a narrow space.
38. The composite sheet has a substantially flat surface on the second sheet side in both of the central region and the side region, and is provided with irregularities with large undulations on the first sheet side. The absorbent article according to any one of 37.
39. The central first convex portion and the central second convex portion constituting the central continuous convex portion formed in plural in the central region are both substantially circular in shape in plan view. The absorbent article of Claim 1.
40. In the central region of the composite sheet, a non-embossed region that extends in the second direction and does not have a joint portion continuously in the second direction, and extends in the second direction, the joint portions are regular. The absorbent article according to any one of claims 1 to 39, wherein the embossed areas formed in a pattern are alternately formed in the first direction.
41. The absorbent body comprising an absorbent core containing an absorbent material, and the topsheet disposed on the skin-facing surface side of the absorbent body, perpendicular to the longitudinal direction corresponding to the wearer's front-rear direction An absorbent article having a transverse direction,
    The absorbent body is located in a laterally central portion of the absorbent core and extends in the longitudinal direction, and is located on both lateral sides of the core low stiffness area and compared to the core low stiffness area. Having a highly rigid core high rigidity region,
    The top sheet is positioned on both sides in the lateral direction of the surface material low-rigidity region and overlaps with the core low-rigidity region in a plan view in comparison with the surface material low-rigidity region. The absorbent article according to claim 1, further comprising a highly rigid surface material high rigidity region, wherein the surface material high rigidity region and the core high rigidity region overlap in plan view.
42. 42. The absorbent article according to claim 41, wherein the core low rigidity region has a lower basis weight than the core high rigidity region.
43. 43. The absorbent article according to claim 41 or 42, wherein the core high-rigidity region is a region other than the core low-rigidity region in the absorbent core and surrounds the core low-rigidity region.
44. A groove is formed in a skin facing surface or a non-skin facing surface of the core low-rigidity region, and a portion where the groove is formed has a lower basis weight than a portion where the groove is not formed in the core low-rigidity region. The absorbent article according to 42 or 43.
45. It has the abdominal side arranged on the abdomen side of the wearer and the dorsal side part arranged on the dorsal side and the crotch part located between them in the vertical direction,
    45. The absorption according to claim 44, wherein the core low-rigidity region is a region in which a plurality of linear grooves are formed in a lattice shape in a plan view and extends from the ventral side portion to the dorsal side portion. Sex goods.
46. The core low-rigidity region has a shorter length in the longitudinal direction than the absorbent core, and the pair of grooves positioned at the outermost sides in the longitudinal direction are longer than the longitudinal front and rear ends of the absorbent core. The absorptive article according to claim 44 or 45 currently located inward.
47. The absorbent article according to any one of claims 44 to 46, wherein a lateral length of the core low-rigidity region is constant over a longitudinal length of the core low-rigidity region.
48. The core low-rigidity region has a relatively high basis weight and a high basis weight portion having a convex shape protruding toward the non-skin facing surface side, and is adjacent to the high basis weight portion and relatively has a basis weight. Has a low basis weight part that is recessed toward the skin facing surface side,
    The absorbent article according to any one of claims 44 to 47, wherein the groove is a recess formed on a non-skin facing surface side at a position where the low basis weight portion is formed.
49. 49. In the core low rigidity region, the non-skin facing surface has an uneven structure due to the presence of the plurality of grooves, whereas the skin facing surface does not have the grooves and is flat. The absorbent article as described.
50. In the core low-rigidity region, a plurality of linear grooves extend in the vertical direction, and a plurality of linear grooves extend in the horizontal direction. The absorbent article according to claim 48 or 49, wherein the core low-rigidity region is partitioned into a plurality of small regions by the groove, and the small region is the high basis weight portion.
51. The absorbent article according to any one of claims 48 to 50, wherein each of the high basis weight parts is partitioned by the low basis weight part and is individually independent.
52. The absorbent article according to any one of claims 48 to 51, wherein the ratio of the basis weight of the low basis weight part to the basis weight of the high basis weight part is 20% or more and 80% or less as the latter / the former. .
53. The absorbent article according to any one of claims 48 to 52, wherein a basis weight of the low basis weight part is 100 g / m ² or more and 500 g / m ² or less.
54. The absorbent article according to any one of claims 48 to 53, wherein a basis weight of the high basis weight part is 300 g / m ² or more and 900 g / m ² or less.
55. The high basis weight part is thicker than the low basis weight part, and the ratio of the thickness of the low basis weight part to the thickness of the high basis weight part is 30% or more and 90% or less as the latter / the former. The absorbent article according to any one of claims 48 to 54, wherein
56. The absorbent article according to any one of claims 48 to 55, wherein the thickness of the low basis weight part is 1.5 mm or more and 4.5 mm or less.
57. The absorbent article according to any one of claims 48 to 56, wherein the thickness of the high basis weight part is 2 mm or more and 8 mm or less.
58. The absorbent article according to any one of claims 48 to 57, wherein a thickness of the core high-rigidity region is substantially the same as a thickness of the high basis weight portion of the core low-rigidity region.
59. The absorbent article according to any one of claims 41 to 58, wherein a bending rigidity of the core low rigidity region is 3 g or more and 10 g or less.
60. The absorbent article according to any one of claims 41 to 59, wherein the bending rigidity of the core high rigidity region is 5 g or more and 20 g or less.
61. The absorbent article according to any one of claims 41 to 60, wherein a difference in bending rigidity between the core low rigidity region and the core high rigidity region is 1 g or more.
62. The surface sheet has a convex portion protruding toward the wearer's skin side and a concave portion existing around the convex portion, and the convex portion and the surface material low-rigidity region and the surface material high-rigidity region The absorbent article according to any one of claims 44 to 61, wherein the formation pattern of the recesses is different.
63. 63. The absorbent article according to claim 62, wherein the concave portion is a high density portion that has been embossed, and the convex portion is a low density portion that has not been embossed.
64. 64. The absorbent article according to claim 62 or 63, wherein, in the surface material high-rigidity region, the convex portion is formed in a dotted or staggered shape in a plan view.
65. The absorbent article according to any one of claims 62 to 64, wherein the surface material low-rigidity region has continuous convex portions having a shape in which a plurality of convex portions are arranged in a lateral direction as the convex portions.
66. The absorbent article according to claim 65, wherein the surface material high-rigidity region does not have the continuous convex portion, and the surface material high-rigidity region has a plurality of the convex portions independently.
67. 67. The absorbent article according to claim 65 or 66, wherein the continuous convex portion is hollow, and the hollow portion extends continuously over substantially the entire length in the lateral direction of the continuous convex portion.
68. The absorbent article according to any one of claims 65 to 67, wherein the continuous convex part is formed by alternately connecting two kinds of small convex parts having different heights in the horizontal direction.
69. In the surface material low-rigidity region, a plurality of convex portions arranged by the convex portions and the continuous convex portions are alternately and linearly arranged along the vertical direction, and one convex portion and one convex portion are arranged. 69. The absorbent article according to claim 68, wherein the small convex portions are formed at the same position in the lateral direction.
70. The absorbent article according to any one of claims 65 to 69, wherein the pitch of the continuous convex portions is 3 mm or more and 9 mm or less.
71. In the surface material low-rigidity region, the plurality of convex portions are intermittently formed in the vertical direction at a predetermined pitch P4, and in the core low-rigidity region, the plurality of grooves are intermittent in the vertical direction at a predetermined pitch P5. The absorbent article according to any one of claims 62 to 70, wherein the ratio of pitch P5 to pitch P4 is not less than 2 and not more than 7 as pitch P5 / pitch P4.
72. The absorbent article according to any one of claims 41 to 71, wherein a ratio of the bending rigidity of the high-surface material region to the bending rigidity of the low-surface material region is 1.1 or more as the latter / the former. .
73. The absorbent article according to any one of claims 41 to 72, wherein the bending rigidity of the high-stiffness surface material region is 10 cN or more and 50 cN or less, assuming that the bending rigidity of the low-surface material region is higher. .
74. The absorbent article according to any one of claims 41 to 73, wherein the bending rigidity of the low-surface material stiffness region is 40 cN or less and 5 cN or more on the assumption that the bending stiffness of the high-surface material rigidity region is smaller. .
75. The ratio of the area of the skin facing surface of the core low-rigidity area to the total area of the skin facing surface of the absorbent core is 20% or more and 70% or less. Absorbent article.
76. 76. The plane according to claim 41, wherein a boundary between the core low-rigidity region and the core high-rigidity region overlaps a boundary between the surface material low-rigidity region and the surface material high-rigidity region in plan view. Absorbent articles.
77. It has the abdominal side arranged on the abdomen side of the wearer and the dorsal side part arranged on the dorsal side and the crotch part located between them in the vertical direction,
    In the ventral part and the dorsal part, the boundary between the core low rigidity region and the core high rigidity region is located laterally outward from the boundary between the surface material low rigidity region and the surface material high rigidity region. And
    In the crotch part, a boundary between the core low-rigidity region and the core high-rigidity region is located inward in a lateral direction from a boundary between the surface material low-rigidity region and the surface material high-rigidity region. The absorbent article according to any one of 41 to 76.
78. The absorbent article according to any one of claims 41 to 77, wherein the absorbent core has a single-layer structure and has an hourglass shape in which a central portion in a longitudinal direction is bound inward in a plan view.

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