JP7075754B2 - Absorbent article - Google Patents

Description

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

Conventionally, for the purpose of reducing the contact area and friction between the surface sheet and the wearer's skin, and improving the texture and breathability, the skin-facing surface side of the surface sheet of an absorbent article such as a disposable diaper has been used. The technique of making a three-dimensional shape is known.
Also in the present applicant, as the surface sheet of the absorbent article, the laminated first sheet and the second sheet are bonded to each other at a plurality of joints, and the first sheet is a portion other than the joint. In, it is proposed to use a composite sheet that protrudes in a direction away from the second sheet and forms a convex portion that protrudes toward the wearer's skin side.
For example, it is an absorbent article provided with a surface sheet composed of a composite sheet in which the first sheet and the second sheet are joined at a plurality of joint portions, and the first sheet protrudes in a direction away from the second sheet. As the convex portions protruding toward the skin side of the wearer, a plurality of continuous convex portions extending in the width direction of the article are formed at intervals in the longitudinal direction of the article, and the plurality of continuous convex portions are formed in the longitudinal direction of the article. We have proposed one that is convexly curved toward one end or has a curved portion (Patent Document 1). Further, a highly convex portion that protrudes toward the skin side of the wearer and has a hollow portion on the back surface side to form the top of the convex portion, and the highly convex portion around the highly convex portion. We propose an absorbent article using a composite sheet formed in a state where the convex portions composed of four low convex portions formed in a state of being connected to the portions are dispersed in the in-plane direction of the sheet as a surface sheet. (Patent Document 2).

Japanese Unexamined Patent Publication No. 2017-93333 Japanese Unexamined Patent Publication No. 2016-116584

According to Patent Document 1, since the ventilation path between the continuous convex portions is stably maintained in the composite sheet, the absorbent article using the composite sheet is excellent in breathability and stuffiness prevention property. Further, according to Patent Document 2, in the convex portion of the composite sheet, even if the surface sheet is refracted in the wearing state, the low convex portion is preferentially crushed and the central high convex portion is hard to be crushed, and the convex portion ventilates. Good sex etc. are maintained.
However, when the continuous convex portion described in Patent Document 1 and the convex portion described in Patent Document 2 are crushed by the wearer's skin while wearing the diaper, it is difficult to maintain the air permeability in the diaper. There is a risk of becoming. Further, in the composite sheet in which a plurality of convex portions are formed, the excrement liquid is easily diffused between the convex portions, but the excretory liquid may be excessively diffused to cause lateral leakage.

An object of the present invention is to provide an absorbent article capable of eliminating the above-mentioned drawbacks of the prior art.

The present invention is an absorbent article comprising a front surface sheet, a back surface sheet and an absorber arranged between these sheets, and having a longitudinal direction corresponding to the front-back direction of the wearer and a width direction orthogonal to the longitudinal direction. The surface sheet has a central region located in the central portion in the width direction and a pair of side regions located on both sides of the central region, and the central region and the side regions are each at a constant interval. It is composed of a plurality of first continuous recesses arranged continuously in one direction and a plurality of second continuous recesses arranged at regular intervals in a direction intersecting the one direction. It has a grid-like recess and a convex portion surrounded by the first continuous recess and the second continuous recess, and the first and second continuous recesses are not parallel to the longitudinal direction and the width direction, respectively. The central region provides an absorbent article in which the width of the first and second continuous recesses is larger than that of the side region.

According to the absorbent article of the present invention, it is possible to achieve both excellent air permeability, prevention of lateral leakage, and diffusivity of excrement liquid.

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. FIG. 2 is a sectional view taken along line II-II of FIG. FIG. 3 is a plan view showing a composite sheet preferably used as the surface sheet according to the present invention. FIG. 4 is an explanatory diagram of a method of measuring the width of the linear non-contact portion. FIG. 5 is an enlarged plan view (a) showing the central region M and an enlarged plan view (b) showing the side region S of the composite sheet shown in FIG. FIG. 6 is an enlarged cross-sectional view showing a cross section of the surface sheet (composite sheet) shown in FIG. 5 along the thickness direction, and is a sectional view taken along line III-III (a) and FIG. 5 (b) shown in FIG. 5 (a). It is a cross-sectional view (b) of VV line shown in. FIG. 7 is an explanatory diagram of a main part of another embodiment of the present invention.

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

The diaper 100 has a longitudinal direction X corresponding to the front-back direction of the wearer and a width direction Y orthogonal to the longitudinal direction X when the diaper 100 is spread out in a plane as shown in FIG. There is. Further, the diaper 100 has a ventral portion A arranged on the ventral side of the wearer when worn, a dorsal portion B arranged on the dorsal side of the wearer when worn, and a ventral portion A and the back in the longitudinal direction X. It is provided in the crotch portion C located between the side portion B and the crotch portion B. The diaper 100 is a deployable disposable diaper, and fastening tapes 17 are provided on both side edges of the dorsal side B, and a landing zone 18 for fastening the fastening tape 17 to the outer surface of the ventral side A. Is provided.

The absorber 14 in the diaper 100 includes an absorbent core 14a and a core wrap sheet 14b that encloses the absorbent core 14a. The absorbent core 14a can be composed of a fiber stack of liquid-absorbent fibers such as pulp fiber or a mixed fiber stack of the liquid-absorbent fiber and a water-absorbent polymer. Examples of the liquid-absorbent fiber include cellulosic hydrophilic fibers such as pulp fiber, rayon fiber, cotton fiber and cellulose acetate. In addition to the cellulose-based hydrophilic fiber, a fiber made of a synthetic resin such as polyolefin, polyester, or polyamide, which has been hydrophilized with a surfactant or the like, can also be used. As the core wrap sheet 14b, for example, tissue paper or a water-permeable non-woven fabric is used. One core wrap sheet 14b may wrap the entire absorbent core 14a, or two or more core wrap sheets 14b may be combined to wrap the absorbent core 14a. As the back sheet 13, a liquid-impermeable or water-repellent resin film, a laminated sheet of a resin film and a non-woven 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 diaper 100 in the longitudinal direction X, and due to the contraction of the elastic members 15a, the inseam C in the wearing state is on the skin side of the wearer. A three-dimensional gather that stands up toward is formed. Further, the leg elastic member 16 is arranged in the extended state at the portion arranged around the leg in the inseam C, and due to the contraction thereof, the fit to the wearer's leg around the inseam C in the wearing state. Leg gathers are formed to improve.

The surface sheet 12 in the disposable diaper 100 of the first embodiment is composed of the composite sheet 10 shown in FIG.
As shown in FIG. 3, the composite sheet 10 has a central region M in which irregularities composed of a plurality of concave portions 3 and convex portions 4 are formed in different patterns from each other, and a pair of side regions S located on both sides of the central region M. , S. The central region M is located at the center of the diaper 100 in the width direction Y, and the pair of side regions S and S are formed on both outer sides of the diaper 100 with the central region M in between. The pair of side regions S and S are formed on both sides of the composite sheet 10 along the longitudinal direction X of the diaper 100. The side regions S are formed at positions symmetrical with respect to the longitudinal center line CL extending in the longitudinal direction X of the diaper 100, and unevenness is formed in each side region S in the same pattern.
In the present specification, the concave portion 3 and the convex portion 4 can be identified by the following method.

<Method of identifying concave and convex parts>
A 50 mm × 50 mm measuring piece is cut out from the surface sheet, and the non-skin facing surface of the measuring piece is attached to a flat acrylic plate. A measuring piece with an acrylic plate attached on a general stamp stand (for example, Unistamp (trade name) manufactured by Mitsubishi Pencil Co., Ltd., red) used for stamping rubber stamps, etc., faces the skin. Place it face down. Next, the measuring piece is pressed from above the acrylic plate at 1.2 kPa, and ink is applied to the skin-facing surface of the measuring piece. The surface of the measurement piece with ink facing the skin is also called the ink surface. Next, the measuring piece is placed on a blank sheet of paper with the ink side facing down, and the pressure is applied from the top of the acrylic plate at 1.2 kPa to transfer the ink to the blank sheet of paper. The portion (contact portion) to which the ink is transferred to this blank paper is referred to as a convex portion 4, and the portion (non-contact portion) to which the ink is not transferred is referred to as a concave portion 3. Further, the first and second continuous recesses, which will be described later, refer to linear non-contact portions (linear non-contact portions) having a width of 0.3 mm or more, which extend continuously in one direction.

A method for measuring the width W of the linear non-contact portion will be described below with reference to FIG. In FIG. 4, the linear non-contact portion is represented by reference numerals S1 and S3, and the contact portion is represented by reference numeral S5.
First, the intersection points P1 and P1 of the linear non-contact portion S1 to be measured and two other linear non-contact portions S3 and S3 intersecting with the linear non-contact portion S1 and adjacent to each other are set. The intersections P1 and P1 referred to here are intersections between the center line of the linear non-contact portion S1 and the center line of another linear non-contact portion S3, S3, and are usually the intersections of the linear non-contact portions S1 and S3. It is located in the center of the intersection. Next, a perpendicular line L that passes through the midpoint P3 between the intersection points P1 and P1 and intersects the linear non-contact portion S1 to be measured perpendicularly is set, and both side edges I of the linear non-contact portion S1 on the perpendicular line L are set. The distance W between I is measured at five midpoints P3 with respect to the linear non-contact portion S1 to be measured. Then, the average value of these measured values is defined as the width W of the linear non-contact portion S1. The measurement of the width W of the linear non-contact portion is performed on the blank paper on which the above-mentioned ink is transferred.

FIG. 5 (a) is an enlarged plan view showing a part of the central region M of the composite sheet 10 in an enlarged scale, and FIG. 5 (b) further enlarges a part of the side region S of the composite sheet 10. It is an enlarged plan view shown by.
As shown in FIGS. 5A and 5B, each of the central region M and the side regions S and S is a plurality of first continuous lines arranged continuously at regular intervals as recesses 3 in one direction. It has grid-like recesses 30a and 30b composed of recesses 31a and 31b and a plurality of second continuous recesses 35a and 35b which are arranged at regular intervals and extend continuously in a direction intersecting the one direction. There is. Hereinafter, the first continuous recesses 31a and 31b in the central region M and the side regions S and S are collectively referred to as "first continuous recesses 31", and the second continuous recesses 35a and 35b in both of these regions M, S and S are referred to as "first continuous recesses 31". Collectively, it is referred to as "second continuous recess 35". Further, the first and second continuous recesses 31a and 35a in the central region M are also referred to as the first central continuous recess 31a and the second central continuous recess 35a, respectively, and the first and second continuous recesses 31b, in the side regions S and S, respectively. 35b is also referred to as a first side continuous recess 31b and a second side continuous recess 35b, respectively.
The first continuous recess 31 and the second continuous recess 35 are non-parallel to the longitudinal direction X and the width direction Y, respectively. That is, the first continuous recess 31 and the second continuous recess 35 are linear recesses 3 extending in directions intersecting each of the longitudinal direction X and the width direction Y, respectively, in the central region M and the side regions S and S, respectively. , These recesses 31 and 35 are continuously formed in a grid pattern.

Further, each of the central region M and the side regions S and S has convex portions 4a and 4b surrounded by the first continuous concave portion 31 and the second continuous concave portion 35. In the central region M and the side regions S and S, the convex portions 4a and 4b are arranged in a scattered pattern between the grid-like concave portions 30a and 30b [see FIGS. 5 (a) and 5 (b)].

The central region M has a larger width of the first and second continuous recesses 31, 35 than the side regions S and S. For example, the width of the first central continuous recess 31a is larger than the width of one or both of the first side continuous recess 31b and the second side continuous recess 35b. Further, the width of the second central continuous recess 35a is larger than the width of one or both of the first side continuous recess 31b and the second side continuous recess 35b. The widths of the continuous recesses 31 and 35 can be obtained by the above-mentioned method for measuring the width W of the linear non-contact portion.

In the diaper 100, the surface sheet 12 has a grid-like recess 30 composed of a plurality of first and second continuous recesses 31 and 35 in the central region M and the side regions S and S, and the first and second continuous recesses. Since it has a convex portion 4 surrounded by 31, 35, it is easy for moisture in the diaper 100 to escape to the outside of the diaper 100 along the first and second continuous concave portions 31, 35, and good air permeability is provided. At the same time, good diffusivity can be obtained by transmitting the excreted liquid such as urine excreted in the diaper 100 to the lattice-shaped recess 30. However, if the excrement liquid is excessively diffused along the first and second continuous recesses 31b and 35b in the side regions S and S, lateral leakage may occur.
In the diaper 100 of the present embodiment, the central region M of the surface sheet 12 has a larger width of the first and second continuous recesses 31, 35 than the side regions S and S. That is, the width of the conduction path of the excrement liquid in the side regions S and S is narrower than the width of the conduction path in the central region M. As a result, excellent air permeability and diffusivity are exhibited in the central region M where lateral leakage is unlikely to occur, and excessive diffusion of excrement is effectively suppressed in the side regions S and S, so that the diaper 100 as a whole has In addition to being excellent in breathability, it is possible to achieve both prevention of lateral leakage and diffusivity of excrement.

From the viewpoint of further improving the air permeability and diffusivity, the width W1 of the first central continuous recess 31a [see FIG. 5 (a)] is changed to the width W6 of the first side continuous recess 31b [see FIG. 5 (b)]. On the other hand, it is preferably 120% or more, more preferably 130% or more, preferably 250% or less, more preferably 180% or less, and preferably 120% or more and 250% or less, more preferably 130% or more. It is 180% or less.
From the same viewpoint as above, the width W1 [see FIG. 5A] of the first central continuous recess 31a is preferably 0.5 mm or more, more preferably 1 mm or more, and preferably 5 mm or less, more preferably. It is 3 mm or less, preferably 0.5 mm or more and 5 mm or less, and more preferably 1 mm or more and 3 mm or less.

From the viewpoint of keeping the air permeability in the central region M uniform, the width W1 of the first central continuous recess 31a [see FIG. 5 (a)] is changed to the width W3 of the second central continuous recess 35a [see FIG. 5 (a)]. On the other hand, it is preferably 80% or more, more preferably 90% or more, preferably 120% or less, more preferably 110% or less, and preferably 80% or more and 120% or less, more preferably 90% or more. It is 110% or less, more preferably 100%.
From the viewpoint of keeping the air permeability in the side regions S and S uniform, the width W6 of the first side continuous recess 31b [see FIG. 5 (b)] is the width W8 of the second side continuous recess 35b [see FIG. 5 (b). ], It is preferably 80% or more, more preferably 90% or more, preferably 120% or less, more preferably 110% or less, and preferably 80% or more and 120% or less, more preferably 90. % Or more and 110% or less, more preferably 100%.

In the central region M and the side regions S and S, the first and second continuous recesses 31, 35 are non-parallel to the longitudinal direction X and the width direction Y, respectively, as described above. From the viewpoint of improving the air permeability and diffusivity in the central region M and improving the fit to the wearer's skin in the side regions S and S, the first and second continuous recesses 31a and 35a in the central region M It is preferable that the inclination angles θ1 and θ3 with respect to the width direction Y are larger than the inclination angles θ6 and θ8 with respect to the width direction Y of the first and second continuous recesses 31b and 35b in the side regions S and S, respectively. For example, the inclination angle θ1 of the first central continuous recess 31a with respect to the width direction Y is one of the inclination angle θ6 with respect to the width direction Y of the first side continuous recess 31b and the inclination angle θ8 with respect to the width direction Y of the second side continuous recess 35b. Or it is preferable that it is larger than both. Further, the inclination angle θ3 of the second central continuous recess 35a with respect to the width direction Y is one of the inclination angle θ6 with respect to the width direction Y of the first side continuous recess 31b and the inclination angle θ8 with respect to the width direction Y of the second side continuous recess 35b. Or it is preferable that it is larger than both.

From the viewpoint of improving the air permeability and diffusivity in the central region M and the fit in the side regions S and S, the inclination angle θ1 [see FIG. 5A] with respect to the width direction Y of the first central continuous recess 31a and the first. The difference from the inclination angle θ6 [see FIG. 5 (b)] of the one-side continuous recess 31b with respect to the width direction Y is preferably 10 ° or more, more preferably 20 ° or more, and preferably 45 ° or less, more preferably. Is 35 ° or less, preferably 10 ° or more and 45 ° or less, and more preferably 20 ° or more and 35 ° or less.
From the viewpoint of improving the air permeability and diffusivity in the central region M, the inclination angle θ1 [see FIG. 5A] with respect to the width direction Y of the first central continuous recess 31a is preferably 45 ° or more, more preferably 50 °. The above is more, preferably 80 ° or less, more preferably 70 ° or less, preferably 45 ° or more and 80 ° or less, and more preferably 50 ° or more and 70 ° or less.
From the viewpoint of allowing moisture in the diaper 100 to escape more uniformly, the inclination angle θ1 of the first central continuous recess 31a with respect to the width direction Y [see FIG. 5A] and the inclination angle of the second central continuous recess 35a with respect to the width direction Y. The difference from θ3 [see FIG. 5A] is preferably 10 ° or less, more preferably 5 ° or less, and more preferably both inclination angles θ1 and θ3 are equal.
From the viewpoint of imparting a fit equal to both side regions S and S, the difference between the inclination angle θ6 of the first side continuous recess 31b with respect to the width direction Y and the inclination angle θ8 of the second side continuous recess 35b with respect to the width direction Y is It is preferably 10 ° or less, more preferably 5 ° or less, and more preferably both inclination angles θ6 and θ8 are equal.

In the present embodiment, the convex portions 4 are arranged in scattered dots on the surface sheet 12, but in the portion where the convex portions 4 are finely arranged, the sheet is soft and good fit can be obtained. From the viewpoint of improving the fit of the side regions S and S arranged around the wearer's undercarriage, the central region M has a larger distance between the first continuous recesses 31 than the side regions S and S, and has a second position. It is preferable that the distance between the two continuous recesses 35 is large. That is, it is preferable that the distance L1 between the first central continuous recesses 31a [see FIG. 5 (a)] is larger than the distance L6 between the first side continuous recesses 31b [see FIG. 5 (b)]. Further, it is preferable that the distance L3 between the second central continuous recesses 35a [see FIG. 5 (a)] is larger than the distance L8 between the second side continuous recesses 35b [see FIG. 5 (b)].
The distance between the first continuous recesses 31 is the minimum length between two continuous recesses adjacent to each other with the convex portion 4 interposed therebetween, and is orthogonal to the direction in which the two continuous recesses extend. The shortest distance between the side edge of one continuous recess and the side edge of the other continuous recess adjacent to the side edge, measured along.

From the viewpoint of more reliably achieving air permeability and diffusivity in the central region M and improving the fit in the side regions S and S, the distance L1 between the first central continuous recesses 31a [see FIG. 5 (a)] is , The distance L6 between the first side continuous recesses 31b [see FIG. 5 (b)] is preferably 110% or more, more preferably 130% or more, and preferably 250% or less, more preferably 200%. It is preferably 110% or more and 250% or less, and more preferably 130% or more and 200% or less.
From the viewpoint of more reliably achieving air permeability and diffusivity in the central region M, the distance L1 between the first central continuous recesses 31a [see FIG. 5A] is preferably 2 mm or more, more preferably 4 mm or more. Further, it is preferably 10 mm or less, more preferably 8 mm or less, preferably 2 mm or more and 10 mm or less, and more preferably 4 mm or more and 8 mm or less.
From the same viewpoint as above, the distance L1 between the first central continuous recesses 31a [see FIG. 5 (a)] is preferable with respect to the distance L3 between the second central continuous recesses 35a [see FIG. 5 (a)]. Is 80% or more, more preferably 90% or more, preferably 120% or less, more preferably 110% or less, and preferably 80% or more and 120% or less, more preferably 90% or more and 110% or less. More preferably, it is 100%.
From the viewpoint of improving the fit in the side regions S and S, the distance L6 between the first side continuous recesses 31b [see FIG. 5 (b)] is the distance L8 between the second side continuous recesses 35b [FIG. 5 (b)). Reference], preferably 80% or more, more preferably 90% or more, preferably 120% or less, more preferably 110% or less, and preferably 80% or more and 120% or less, more preferably. It is 90% or more and 110% or less, more preferably 100%.

The composite sheet 10 used as the surface sheet 12 in the present embodiment has a two-layer structure in which the first sheet 1 and the second sheet 2 are partially joined, and the first sheet 1 is other than the recess 3. The convex portions 4a and 4b are formed so as to project away from the second sheet 2 and project toward the wearer's skin side. In both the central region M and the side region S, the composite sheet 10 has a substantially flat surface on the second sheet 2 side, and irregularities are formed on the first sheet 1 side.

The first sheet 1 and the second sheet 2 are made of a sheet material. As the sheet material, for example, a fiber sheet such as a non-woven fabric, a woven fabric and 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 and the like, and it is particularly preferable to use a non-woven fabric. The types of sheet materials constituting the first sheet 1 and the second sheet 2 may be the same or different.

Examples of the non-woven fabric when the non-woven fabric is used as the sheet material constituting the first sheet 1 and the second sheet 2 include air-through non-woven fabric, spunbond non-woven fabric, spunlace non-woven fabric, melt blown non-woven fabric, resin bond non-woven fabric, needle punch non-woven fabric and the like. Be done. It is also possible to use a laminated body in which two or more kinds of these non-woven fabrics are combined, or a laminated body in which these non-woven fabrics and a film or the like are combined. Among these, it is preferable to use an air-through non-woven fabric or a spunbonded non-woven 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 non-woven fabric is preferably 10 g / m ² or more and 40 g / m ² or less, and more preferably 15 g / m ² or more and 35 g / m ² or less.

As the fiber constituting the non-woven fabric, a fiber 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 esters, 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 first continuous recess 31 and the second continuous recess 35 formed in the central region M and the side regions S and S are formed by a plurality of consolidation portions 5 arranged in a constant pattern. In the consolidation portion 5 in the present embodiment, the first sheet 1 and the second sheet 2 constituting the composite sheet 10 are fused, and both the sheets 1 and 2 are partially joined. That is, in the present embodiment, the consolidation portion 5 functions as a joint portion for joining the first sheet 1 and the second sheet 2.

Each of the central region M and the side regions S and S of the present embodiment has a consolidation portion 5 at the intersection 36 of the first continuous recess 31 and the second continuous recess 35. In the central region M, as the consolidation portion 5, a horizontally long first consolidation portion 50 long in the width direction Y and a second consolidation portion 53 having a square plan view are formed in a constant pattern. The first consolidation portion 50 is formed at the intersection 36a of the first central continuous recess 31a and the second central continuous recess 35a, and has a horizontally long shape long in the width direction Y. The second consolidation portion 53 is formed in a portion 37a other than the intersection portion 36a, and has a square shape in a plan view. The portion 37a other than the intersection 36a is a portion where the first continuous recess 31a and the second continuous recess 35a do not intersect.
Since the central region M has the consolidation portion 5 at the intersection 36a, the first and second central continuous recesses 31a and 35a continuous in one direction can be clearly formed, and the air permeability and diffusivity are further improved. Can be improved.

The consolidation portion 5 in the present embodiment is formed by embossing the first sheet 1 and the second sheet 2 in a laminated state to increase the density of the embossed portion. When the surface sheet 12 has a single-layer structure, the consolidation portion 5 is a high-density portion in which the constituent fibers of the surface sheet 12 are densified. In the consolidation unit 5, the constituent fibers of the surface sheet 12 may be fused to form a film, or the fiber morphology may be maintained.

As described above, the central region M in the present embodiment has a horizontally long first consolidation portion 50 at the intersection 36a. That is, the first consolidation unit 50 has a longer length a [see FIG. 5 (a)] in the width direction Y than the length b [see FIG. 5 (a)] of the diaper 100 in the longitudinal direction X. With such a configuration, the continuous recesses 31a and 35a having a large width can be easily formed in the surface sheet 12, and the flexibility and the absorption performance can be improved.

The consolidation portion 50 formed at the intersection 36a in the central region M may be divided into a plurality of two or three in the width direction Y. That is, as shown in FIG. 7, the first consolidation unit 50a may be configured to include a plurality of small consolidation units 51 and an intermittent portion 52. When the first consolidation portion 50a includes the intermittent portion 52, the length a3 in the width direction Y of the first consolidation portion 50a is the length in the width direction Y including the intermittent portion 52. Even when the intermittent portion 52 is included, it is preferable that the length a3 in the width direction Y is longer than the length b3 in the longitudinal direction X in the first consolidation portion 50a (see FIG. 7).

From the viewpoint of improving the flexibility and absorption performance of the surface sheet 12, the first compaction portion 50 has a length a in the width direction Y [see FIG. 5A] and a length b in the longitudinal direction X [FIG. 5]. (See)], preferably 120% or more, more preferably 150% or more, preferably 500% or less, more preferably 300% or less, and preferably 120% or more and 500% or less. More preferably, it is 150% or more and 300% or less.
Further, from the same viewpoint as above, the length a in the width direction Y of the first consolidation unit 50 [see FIG. 5A] is the width W1 of the first central continuous recess 31a [see FIG. 5A]. On the other hand, it is preferably 105% or more, more preferably 120% or more, preferably 150% or less, more preferably 140% or less, and preferably 105% or more and 150% or less, more preferably 120%. More than 140% or less.

In the central region M, the first consolidation portions 50 and the second consolidation portions 53 are alternately arranged along the extending direction D1 of the first continuous recess 31a at regular intervals in the first continuous recess 31a. However, along the extending direction D2 of the first inclined consolidation unit row R1 and the second continuous recess 35a, the first consolidation unit 50 and the second consolidation unit 53 are spaced apart from the second continuous recess 35a at regular intervals. A plurality of rows of second inclined consolidation unit rows R2 in which and are alternately arranged are formed. The first inclined consolidation unit row R1 and the second inclined consolidation unit row R2 intersect so as to share the first consolidation unit 50 at the intersection 36a [see FIG. 5 (a)].

Further, in the central region M, a plurality of first consolidation portions 50 in the longitudinal direction are arranged along the longitudinal direction X, and a plurality of second consolidation portions 53 along the longitudinal direction X. A plurality of rows of the second consolidation consolidation rows R6 in the longitudinal direction are formed, and the first consolidation consolidation row R5 in the longitudinal direction and the second consolidation consolidation row R6 in the longitudinal direction alternate in the width direction Y. They are lined up. The first consolidation row R5 in the longitudinal direction and the second consolidation row R6 in the longitudinal direction partially overlap in the width direction Y, but these consolidation rows R5 and R6 do not partially overlap. Also good [see FIG. 5 (a)].

Further, in the central region M, a plurality of first consolidation portions 50 in the width direction are arranged along the width direction Y, and a plurality of second consolidation portions 53 along the width direction Y. A plurality of rows of the second consolidation consolidation rows R8 in the width direction are formed, and the first consolidation consolidation row R7 in the longitudinal direction X and the second consolidation consolidation row R8 in the width direction alternate in the longitudinal direction X. They are lined up [see FIG. 5 (a)].

In the side regions S and S in the present embodiment, the side consolidation portions 55 having a square plan view shape are formed in a constant pattern as the consolidation portions 5. The side consolidation portion 55 is formed at the intersection 36b of the first side continuous recess 31b and the second side continuous recess 35b. On the other hand, the portion 37b other than the intersection portion 36b does not have the consolidation portion 5.
From the viewpoint of easily forming the first and second continuous recesses 31a and 35a having a width larger than that of the side regions S and S in the central region M of the surface sheet 12, the central region M is formed in the side regions S and S. In comparison, it is preferable that the length a of the compaction portion 5 in the width direction Y is long. That is, it is preferable that the length a of the first consolidation portion 50 in the width direction Y is longer than the length a1 of the side consolidation portion 55 in the width direction Y.
From the same viewpoint as above, the length a in the width direction Y of the first consolidation unit 50 [see FIG. 5 (a)] is the length a1 in the width direction Y of the side consolidation unit 55 [FIG. 5 (b)). Reference], preferably 120% or more, more preferably 150% or more, preferably 500% or less, more preferably 300% or less, and preferably 120% or more and 500% or less, more preferably. It is 150% or more and 300% or less.

As described above, the central region M of the present embodiment has the second consolidation portion 53 at the portion 37a other than the intersection portion 36a. From the viewpoint of clearly forming a convex portion 4a between the lattice-shaped concave portions 30a so that the convex portion 4a is not easily crushed even if it comes into contact with the wearer's skin, the consolidation portion 50 of the intersection portion 36a in the central region M is formed. It is preferable that the length of Y in the width direction is longer than that of the second consolidation portion 53. That is, it is preferable that the length a of the first consolidation unit 50 in the width direction Y is larger than the length a5 of the second consolidation unit 53 in the width direction Y.

From the viewpoint of making the convex portion 4a more difficult to collapse, the length a of the first consolidation portion 50 in the width direction Y is preferably 120% or more with respect to the length a5 of the second consolidation portion 53 in the width direction Y. , More preferably 150% or more, preferably 500% or less, more preferably 300% or less, and preferably 120% or more and 500% or less, more preferably 150% or more and 300% or less.

Further, the convex portions 4a are arranged in a staggered manner in the central region M of the composite sheet 10. More specifically, as shown in FIG. 3, the convex portions 4a include a longitudinal convex portion row J1 in which a plurality of convex portions 4a are connected in series along the longitudinal direction X at regular intervals, and a plurality of convex portions 4a are constant. The width direction convex portion row J2 serialized along the width direction Y at regular intervals, and the first direction convex portion row in which a plurality of convex portions 4a are serialized along the extending direction D1 of the first continuous concave portion 31a at regular intervals. J3 and the plurality of convex portions 4a are arranged so as to have a second-direction convex portion row J4 in series along the extending direction D2 of the second continuous concave portion 35a at regular intervals.
In the longitudinal direction convex portions J1 adjacent to each other in the width direction Y, the arrangement positions of the convex portions 4a are shifted by half a pitch in the longitudinal direction X, and the widthwise convex portion rows J2 adjacent to each other in the longitudinal direction X are convex. The arrangement position of the portion 4a is deviated by half a pitch in the width direction Y.

In the pair of side regions S and S of the composite sheet 10, the convex portions 4b are formed in a pattern different from that of the convex portions 4a formed in the central region M. The expression that the pattern of the convex portion is different includes the case where only the arrangement of the convex portion is different, the case where the form of the convex portion is different, and the case where both of them are different. The mode in which the arrangement of the convex portions is different includes the case where the distance between the convex portions is different. Further, the aspect in which the shape of the convex portion is different includes the case where the shape of the convex portion in a plan view is different. In the composite sheet 10 of the present embodiment, the arrangement and the form of the convex portions are different between the central region M and the pair of side regions S and S.

From the viewpoint of ensuring that one or more of the above-mentioned effects are more reliably achieved, the convex portion 4 according to the present invention preferably has the following configuration.
The height H1 of the convex portion 4a in the central region M [see FIG. 6A] is preferably 0.5 mm or more, more preferably 1.0 mm or more, and preferably 5.0 mm or less, still more preferably 4. It is 0.0 mm or less, preferably 0.5 mm or more and 5.0 mm or less, and more preferably 1.0 mm or more and 4.0 mm or less. The height H3 of the convex portion 4b formed in the side region S [see FIG. 6 (b)] is preferably 0.3 mm or more, more preferably 0.6 mm or more, and preferably 4.0 mm or less, further. It is preferably 3.0 mm or less, preferably 0.3 mm or more and 4.0 mm or less, and more preferably 0.6 mm or more and 3.0 mm or less.
Regarding the convex portion 4 in the present embodiment, the height of the convex portion is determined by observing the cross section of each convex portion using a digital microscope (manufactured by Keyence) and determining the shortest distance between the lower surface of the second sheet 2 and the top of the convex portion. The value obtained by measurement.
When the surface sheet 12 is made of a single-layer sheet instead of the composite sheet 10, the height of the convex portion 4 measures the shortest distance from the lower surface of the single-layer sheet constituting the surface sheet 12 to the top of the convex portion. The value obtained by

Further, in the present embodiment, in each of the continuous recesses 31 and 35 of the central region M, one second consolidation portion 53 is provided between the intersections 36a, that is, one portion 37a other than the intersection 36a. It may have a plurality of second consolidation portions 53 such as individual pieces. Further, the convex portion 4a in the central region M is between the four first consolidation portions 50 formed at the four intersections 36a existing around the convex portion 4a and the first consolidation portions 50. It is surrounded by four second consolidation portions 53 existing in the above. The number of the consolidation portions 5 surrounding the convex portions 4a in the central region M is preferably 4 or more, more preferably 8 or more, and preferably 20 or less, more preferably 16 or less. It is preferable that these numbers of consolidation portions 5 are provided as a pair that sandwiches the convex portions 4a from both sides in the longitudinal direction X and the width direction Y.

Further, in the composite sheet 10 of the present embodiment, as shown in FIG. 5A, a longitudinal first consolidation section row R5 and a longitudinal direction second consolidation section row R5 are connected in series at intervals in the longitudinal direction X. A plurality of rows of R6 and R6 are alternately formed in the width direction Y. In these longitudinal consolidation unit rows R5 and R6, the consolidation portions 50 and 53 of the adjacent longitudinal consolidation unit rows adjacent to each other in the width direction Y do not overlap in the longitudinal direction X. Consolidation portions 50 and 53 of the adjacent longitudinal compaction section rows R5 and R6 in the width direction Y overlap in part or all of the longitudinal direction X, or the positions of the ends in the longitudinal direction X coincide with each other. You may be.

In order to manufacture the composite sheet 10 having the above-described configuration, the peripheral surfaces of the strip-shaped first sheet 1 are in an meshing shape with each other in the same manner as in the methods described in Japanese Patent Application Laid-Open No. 2015-11243 and Patent Document 1. After supplying between the first roll and the second roll to deform the first sheet 1 into an uneven shape, the first sheet 1 is moved from the meshing portion along the peripheral surface portion of the first roll. After that, the second sheet 2 is supplied so as to be overlapped with the first sheet 1, and both sheets 1 and 2 are partially bonded by being pressed under heating between the convex portion and the heat roll in the first roll. .. At that time, the concave-convex shape of the first roll and the second roll and the pattern of the consolidation portion formed by the first roll and the heat roll are different between the central portion and the side portion of the first sheet. When the first sheet 1 is deformed into a concave-convex shape by engaging with the meshing portion between the first roll and the second roll, the first sheet is sucked toward the inside of the roll, and the first sheet 1 is used. It is preferable to promote the deformation of the surface into an uneven shape.

Although the present invention has been described above based on the preferred embodiment thereof, the present invention is not limited to the above-described embodiments and can be appropriately modified.
For example, the shape of the convex portion 4 and the consolidation portion 5 surrounding the convex portion 4 and their arrangement can be appropriately determined. The shape of each compacted portion may be any shape such as a rectangle, a square, a circle , an ellipse, an oval, a triangle, a quadrangle, a pentagon, a hexagon, a star, and a heart.
Further, the absorbent article of the present invention may be a pants-type (pull-on type) disposable diaper instead of the deployable disposable diaper, and may be a pants-type or a normal non-pants-type menstrual napkin. It may be present, or it may be an incontinence pad, a panty liner, or the like.

With respect to the embodiments described above, the present invention further discloses the following absorbent articles:
<1>
An absorbent article comprising a front surface sheet, a back surface sheet, and an absorber arranged between these sheets, and having a longitudinal direction corresponding to the front-back direction of the wearer and a width direction orthogonal to the longitudinal direction.
The surface sheet has a central region located in the central portion in the width direction and a pair of side regions located on both sides of the central region.
Each of the central region and the side region is continuous with a plurality of first continuous recesses arranged at regular intervals and extending continuously in one direction in a direction intersecting the one direction arranged at regular intervals. It has a grid-like recess composed of a plurality of second continuous recesses extending from the surface, and a convex portion surrounded by the first continuous recess and the second continuous recess, and each of the first and second continuous recesses has a convex portion. , Non-parallel to the longitudinal direction and the width direction,
The central region is an absorbent article in which the width of the first and second continuous recesses is larger than that of the side region.
<2>
The width W1 of the first continuous recess in the central region is preferably 120% or more, more preferably 130% or more, and preferably 250% with respect to the width W6 of the first continuous recess in the side region. Hereinafter, the absorbent article according to <1>, which is more preferably 180% or less.
<3>
The width W1 of the first continuous recess in the central region is preferably 80% or more, more preferably 90% or more, and preferably 120% with respect to the width W3 of the second continuous recess in the central region. Hereinafter, the absorbent article according to <1> or <2>, which is more preferably 110% or less.
<4>
The width W1 of the first continuous recess in the central region is preferably 0.5 mm or more, more preferably 1 mm or more, and preferably 5 mm or less, more preferably 3 mm or less. > The absorbent article according to any one of 1.
<5>
The width W6 of the first continuous recess in the side region is preferably 80% or more, more preferably 90% or more, and preferably 120% with respect to the width W8 of the second continuous recess in the side region. Hereinafter, the absorbent article according to any one of <1> to <4>, which is more preferably 110% or less.
<6>
The angle of inclination of the first and second continuous recesses in the central region with respect to the width direction is larger than the angle of inclination of the first and second continuous recesses in the side region with respect to the width direction, respectively. The absorbent article according to any one of <5>.
<7>
The difference between the inclination angle θ1 with respect to the width direction of the first continuous recess in the central region and the inclination angle θ6 with respect to the width direction of the first continuous recess in the side region is preferably 10 ° or more, more preferably 20 °. The absorbent article according to any one of <1> to <6>, which is more preferably 45 ° or less, more preferably 35 ° or less.
<8>
The difference between the inclination angle θ1 with respect to the width direction of the first continuous recess in the central region and the inclination angle θ3 with respect to the width direction of the second continuous recess in the central region is preferably 0 ° or more and 10 ° or less, more preferably. The absorbent article according to any one of <1> to <7>, wherein is 0 ° or more and 5 ° or less.
<9>
The inclination angle θ1 with respect to the width direction of the first continuous recess in the central region is preferably 45 ° or more, more preferably 50 ° or more, and preferably 80 ° or less, more preferably 70 ° or less. The absorbent article according to any one of <1> to <8>.
<10>
The difference between the inclination angle θ6 with respect to the width direction of the first continuous recess in the side region and the inclination angle θ8 with respect to the width direction of the second continuous recess in the side region is preferably 0 ° or more and 10 ° or less, more preferably. The absorbent article according to any one of <1> to <9>, wherein is 0 ° or more and 5 ° or less.
<11>
The above-mentioned <1> to <10>, wherein the central region has a large distance between the first continuous recesses and a large distance between the second continuous recesses as compared with the side region. Absorbent article.
<12>
The distance L1 between the first continuous recesses in the central region is preferably 110% or more, more preferably 130% or more, and more preferably 130% or more with respect to the distance L6 between the first continuous recesses in the side region. The absorbent article according to any one of <1> to <11>, which is 250% or less, more preferably 200% or less.
<13>
The distance L1 between the first continuous recesses in the central region is preferably 80% or more, more preferably 90% or more, and preferably 90% or more with respect to the distance L3 between the second continuous recesses in the central region. The absorbent article according to any one of <1> to <12>, which is 120% or less, more preferably 110% or less.
<14>
The distance L1 between the first continuous recesses in the central region is preferably 2 mm or more, more preferably 4 mm or more, and preferably 10 mm or less, more preferably 8 mm or less. The absorbent article according to any one of.
<15>
The distance L6 between the first continuous recesses in the side region is preferably 80% or more, more preferably 90% or more, and preferably 90% or more with respect to the distance L8 between the second continuous recesses in the side region. The absorbent article according to any one of <1> to <14>, which is 120% or less, more preferably 110% or less.
<16>
The absorbent article according to any one of <1> to <15>, wherein the central region has a consolidation portion at the intersection of the first continuous recess and the second continuous recess.
<17>
The central region has a consolidation portion at the intersection of the first continuous recess and the second continuous recess, and the consolidation portion has a length in the width direction as compared with a length in the longitudinal direction. The absorbent article according to any one of <1> to <16>, which has a long length.
<18>
The absorbent article according to <17>, wherein the consolidation portion includes a plurality of small consolidation portions and an intermittent portion.
<19>
The length a in the width direction of the compacted portion is preferably 120% or more, more preferably 150% or more, and preferably 500% or less, more preferably 300, with respect to the length b in the longitudinal direction. % Or less, the absorbent article according to <17> or <18>.
<20>
The length a in the width direction of the consolidated portion is preferably 105% or more, more preferably 120% or more, and preferably 150% or less with respect to the width W1 of the first continuous recess in the central region. The absorbent article according to any one of <17> to <19>, which is more preferably 140% or less.
<21>
Each of the central region and the side region has a consolidation portion at the intersection of the first continuous recess and the second continuous recess.
The absorbent article according to any one of <1> to <20>, wherein the central region has a longer length in the width direction of the consolidated portion than the side region.
<22>
The length a in the width direction of the consolidation portion in the central region is preferably 120% or more, more preferably 150% or more, with respect to the length a1 in the width direction of the consolidation portion in the side region. The absorbent article according to any one of <1> to <23>, preferably 500% or less, more preferably 300% or less.
<25>
The central region has a second consolidation portion in addition to the intersection.
The absorbent article according to any one of <17> to <24>, wherein the consolidation portion of the intersection is longer in the width direction than the second consolidation portion.
<26>
In the central region, a first inclination in which the consolidation portions and the second consolidation portions are alternately arranged at regular intervals along the extending direction of the first continuous recesses. The second step, in which the consolidation section and the second consolidation section are alternately arranged at a certain interval in the second continuous recess along the extending direction of the consolidation section line R1 and the second continuous recess. The absorbent article according to <25> above, wherein a plurality of rows of inclined compaction consolidation portions R2 are formed.
<27>
The absorbent article according to <26>, wherein the first tilted consolidation section row and the second tilted consolidation section row intersect so as to share the compaction section at the intersection.
<29>
The length a in the width direction of the consolidation portion is preferably 120% or more, more preferably 150% or more, and preferably 500% with respect to the length a5 in the width direction of the second consolidation portion. Hereinafter, the absorbent article according to any one of <25> to <27>, which is more preferably 300% or less.
<30>
The absorbent article according to any one of <1> to <29>, wherein the convex portions are arranged in a scattered pattern between the lattice-shaped concave portions in each of the central region and the side region.
<31>
The height H1 of the convex portion in the central region is preferably 0.5 mm or more, more preferably 1.0 mm or more, and preferably 5.0 mm or less, further preferably 4.0 mm or less. 1> The absorbent article according to any one of <30>.
<32>
The height H3 of the convex portion formed in the side region is preferably 0.3 mm or more, more preferably 0.6 mm or more, and preferably 4.0 mm or less, further preferably 3.0 mm or less. The absorbent article according to any one of <1> to <32>.

100 Disposable diapers (absorbent articles)
12 Front sheet 13 Back sheet 14 Absorber 10 Composite sheet 1 1st sheet 2 2nd sheet 3 Recesses 30 Lattice recesses 31 1st continuous recesses 31a 1st central continuous recesses 31b 1st side continuous recesses 35 2nd continuous recesses 35a 2 Central continuous recess 35b 2nd side continuous recess 36 Intersection 4a, 4b Convex part M Central area S Side area 5 Consolidation part 50 1st consolidation part 51 Small compaction part 52 Intermittent part 53 2nd consolidation part

Claims (11)

An absorbent article comprising a front surface sheet, a back surface sheet, and an absorber arranged between these sheets, and having a longitudinal direction corresponding to the front-back direction of the wearer and a width direction orthogonal to the longitudinal direction.
The surface sheet has a central region located in the central portion in the width direction and a pair of side regions located on both sides of the central region.
Each of the central region and the side region is continuous with a plurality of first continuous recesses arranged at regular intervals and extending continuously in one direction in a direction intersecting the one direction arranged at regular intervals. It has a grid-like recess composed of a plurality of second continuous recesses extending from the surface, and a convex portion surrounded by the first continuous recess and the second continuous recess, and each of the first and second continuous recesses has a convex portion. , Non-parallel to the longitudinal direction and the width direction,
The central region has a larger width of the first and second continuous recesses than the side region.
An absorbent article in which the angle of inclination of the first and second continuous recesses in the central region with respect to the width direction is larger than the angle of inclination of the first and second continuous recesses in the side region with respect to the width direction, respectively . The absorbent article according to claim 1 , wherein the central region has a large distance between the first continuous recesses and a large distance between the second continuous recesses as compared with the side region. An absorbent article comprising a front surface sheet, a back surface sheet, and an absorber arranged between these sheets, and having a longitudinal direction corresponding to the front-back direction of the wearer and a width direction orthogonal to the longitudinal direction.
The surface sheet has a central region located in the central portion in the width direction and a pair of side regions located on both sides of the central region.
Each of the central region and the side region is continuous with a plurality of first continuous recesses arranged at regular intervals and extending continuously in one direction in a direction intersecting the one direction arranged at regular intervals. It has a grid-like recess composed of a plurality of second continuous recesses extending from the surface, and a convex portion surrounded by the first continuous recess and the second continuous recess, and each of the first and second continuous recesses has a convex portion. , Non-parallel to the longitudinal direction and the width direction,
The central region has a larger width of the first and second continuous recesses than the side region.
The central region is an absorbent article in which the distance between the first continuous recesses is large and the distance between the second continuous recesses is large as compared with the side region. The absorbent article according to any one of claims 1 to 3, wherein the central region has a consolidation portion at the intersection of the first continuous recess and the second continuous recess. The central region has a consolidation portion at the intersection of the first continuous recess and the second continuous recess, and the consolidation portion has a length in the width direction as compared with a length in the longitudinal direction. The absorbent article according to any one of claims 1 to 4, which has a long length. Each of the central region and the side region has a consolidation portion at the intersection of the first continuous recess and the second continuous recess.
The central region has a longer length in the width direction of the consolidated portion than the side region.
The absorbent article according to any one of claims 1 to 5. The central region has a second consolidation portion in addition to the intersection.
The absorbent article according to any one of claims 4 to 6, wherein the consolidation portion of the intersection is longer in the width direction than the second consolidation portion. One of claims 1 to 7 , wherein the distance L1 between the first continuous recesses in the central region is 110% or more and 250% or less with respect to the distance L6 between the first continuous recesses in the side region. Absorbent article described in. One of claims 1 to 8 , wherein the distance L1 between the first continuous recesses in the central region is 80% or more and 120% or less with respect to the distance L3 between the second continuous recesses in the central region. Absorbent article described in. The absorbent article according to any one of claims 1 to 9 , wherein the distance L1 between the first continuous recesses in the central region is 2 mm or more and 10 mm or less. Any one of claims 1 to 10 , wherein the distance L6 between the first continuous recesses in the side region is 80% or more and 120% or less with respect to the distance L8 between the second continuous recesses in the side region. The absorbent article described in the section.

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