JP2021186679A - Absorptive product - Google Patents

Abstract

To provide an absorptive product which can effectively suppress collapse of the whole projection part by shrinking of an elastic member without damaging touch feeling of the projection part.SOLUTION: The present invention provides an absorptive product 1 having a skin-contact sheet 10 with a non-flat region P. The non-flat region P includes: a plurality of projected parts 41 in which a length in a first direction Y is longer than a length in a second direction X; and a plurality of recessed parts 31 positioned between the projected parts in the first direction or the second direction. The recessed part 31 includes a low basis weight part in which the basis weight of fiber material is smaller than that of the projected part 41. In the absorptive product 1, the elastic member 19 is provided along the first direction Y on a non-skin-facing surface side with respect to the skin-contact sheet 10. The recessed part 31 preferably includes a low basis weight part 32 in which the basis weight of fiber material is smaller than that of the projected part 41.SELECTED DRAWING: Figure 5

Description

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

Absorbent articles such as disposable diapers generally include a sheet that comes into contact with the wearer's skin. From the viewpoint of touch and breathability, an absorbent article in which an uneven shape is formed on the skin-facing surface of such a sheet is known.
For example, in Patent Document 1, in a surface sheet in which a first layer and a second layer are laminated, a first compression recess arranged in a predetermined pattern and a raised portion composed of the first layer are formed. , An absorbent article is described in which a second compression recess that does not reach the second layer is formed in the ridge.

The applicant has previously described a fused portion in which the first nonwoven fabric and the second nonwoven fabric are fused to each other at the peripheral edge of the opening in the surface sheet containing the laminate of the first nonwoven fabric and the second nonwoven fabric. The first nonwoven fabric has a plurality of convex portions protruding in the direction away from the second nonwoven fabric at a portion other than the fused portion, and the fused portion has a plurality of protruding portions protruding toward the sublayer, and the surface thereof is formed. We have proposed an absorbent article in which the sublayer is partially pressed by the protrusions when the sheet is pressed toward the sublayer side (Patent Document 2).

Further, the applicant has a non-elastic region in which the elastic member is not arranged between the elastic region in which the elastic member extending in the width direction is arranged and the absorbent core, and the surface sheet is formed. , A convex portion arranged in a predetermined pattern, and an uneven region in which a continuous vertical groove portion and a horizontal groove portion are formed between the convex portions are provided at a portion overlapping the inelastic region, and the vertical groove portion is meandering. (Patent Document 3) proposes an absorbent article in which the degree of is larger than that of the lateral groove portion.

Japanese Unexamined Patent Publication No. 2006-263296 Japanese Unexamined Patent Publication No. 2018-08997 Japanese Unexamined Patent Publication No. 2019-076499

In a sheet having an uneven shape, the convex portion that comes into contact with the wearer's skin generally tends to follow the wearer's skin as the size thereof increases, so that a good touch can be easily obtained. However, when the convex portion and the elastic member having elasticity in one direction overlap each other, the entire convex portion may be crushed due to the contraction of the elastic member, and the crushed portion comes into close contact with the skin. Breathability may decrease. Patent Documents 1 to 3 do not disclose a technique for solving a problem that a convex portion is crushed by shrinkage of an elastic member.

Therefore, an object of the present invention is to provide an absorbent article capable of effectively suppressing the collapse of the convex portion due to the contraction of the elastic member without impairing the touch of the convex portion.

The present invention comprises a skin contact sheet which has an uneven region and the uneven region abuts on the wearer's skin in a wearing state, and has a vertical direction corresponding to the front-back direction of the wearer and a lateral direction orthogonal to the vertical direction. With respect to an absorbent article having a direction.
The uneven region has a first direction and a second direction orthogonal to the first direction, and a convex portion having a length longer in the first direction than the length in the second direction and a convex portion in the first direction or the second direction. It is preferable to have a plurality of concave portions located between the convex portions.
It is preferable that the concave portion has a low basis weight portion in which the basis weight of the fiber material is smaller than that of the convex portion.
It is preferable that the elastic member is arranged along the first direction on the non-skin facing surface side of the skin contact sheet.

According to the present invention, there is provided an absorbent article capable of effectively suppressing the crushing of the convex portion due to the contraction of the elastic member without impairing the touch of the convex portion. Such absorbent articles have good breathability.

FIG. 1 is a developed plan view schematically showing a skin-facing surface side (inner surface side) of a disposable diaper according to an embodiment of the absorbent article of the present invention in an unfolded and stretched state. FIG. 2 is a sectional view taken along line II-II of FIG. FIG. 3 is a plan view showing the surface sheet (skin contact sheet) of the disposable diaper of the first embodiment. FIG. 4 is an enlarged plan view showing a part of the uneven region P of the skin contact sheet shown in FIG. 3 in an enlarged manner. 5A and 5B are a plan view and a cross-sectional view of a convex portion overlapping the elastic member in the skin contact sheet, and FIG. 5A is a view showing the convex portion before deformation. 5 (b) is a figure which shows the convex part after deformation. FIG. 6 is a cross-sectional view showing an example of the arrangement relationship between the uneven region of the skin contact sheet and the elastic member. FIG. 7 is a cross-sectional view showing another example of the arrangement relationship between the uneven region of the skin contact sheet and the elastic member. FIG. 8 is a cross-sectional view showing still another example of the arrangement relationship between the uneven region of the skin contact sheet and the elastic member. FIG. 9 is a diagram showing an example of the cross-sectional structure of the skin contact sheet according to still another embodiment. FIG. 10 is a view corresponding to FIG. 4 showing still another embodiment of the uneven region in the skin contact sheet. FIG. 11 is a view corresponding to FIG. 4 showing still another embodiment of the uneven region in the skin contact sheet. FIG. 12 is a view corresponding to FIG. 4 showing still another embodiment of the uneven region in the skin contact sheet. FIG. 13 is a perspective view showing still another embodiment of the uneven region in the skin contact sheet. FIG. 14 is a partially broken perspective view showing a stretchable sheet that can be used for the elastic member according to 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 1 (hereinafter, also simply referred to as a diaper 1), which is an embodiment of the absorbent article of the present invention.
As shown in FIGS. 1 and 2, the diaper 1 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. As will be described later, the surface sheet 12 has uneven regions P and PS on the surface facing the skin, but in FIGS. 1 and 2, the irregularities of the uneven regions P and PS are omitted.

FIG. 1 is a diagram showing a developed and extended state of the diaper 1. The diaper 1 has a longitudinal direction X ₁ corresponding to the longitudinal direction of the wearer, and a lateral Y ₁ orthogonal to said longitudinal direction X _1. Moreover, the diaper 1 is longitudinally X ₁ of the full-length 3 equal parts, the front section A that is disposed on the front side of a wearer, the rear section B which is disposed on the rear side of the wearer when worn, And the inseam C located between the ventral side A and the dorsal side B.
The diaper 1 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 tapes 17 to the outer surface of the ventral side A. Is provided.

In the present specification, the "expanded and stretched state" of the diaper 1 means that the diaper 1 is in the unfolded state, and the elastic member of each part of the unfolded diaper 1 is stretched to eliminate the influence of the elastic member. It means the state of being unfolded until it becomes the same as the dimensions when it is unfolded in a plane. Further, the "skin facing surface" is a surface facing the wearer's skin when wearing the diaper when focusing on the diaper or its constituent members (for example, an absorber), and the "non-skin facing surface" is the diaper. This is the surface that faces the wearer's skin when worn. That is, the skin-facing surface is the surface relatively close to the wearer's skin, and the non-skin-facing surface is the surface relatively far from the wearer's skin. "When worn" and "wearing state" refer to a state in which the proper wearing position of the diaper is maintained and worn.

The absorber 14 in the diaper 1 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.

On both sides of the longitudinal X ₁ of the diaper 1, the three-dimensional gather forming sheet 15 having a three-dimensional gathers formed elastic members 15a are arranged, by the contraction of the stereo gathers forming elastic members 15a, crotch portion of the wearer state A three-dimensional gather is formed on C so as to stand up toward the wearer's skin side.
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.
Each standing gather forming elastic members 15a and the leg elastic members 16 in the present embodiment, the stretching direction is the same as the longitudinal direction X ₁ of the diaper 1.

Diaper 1 of this embodiment, in the rear section B, and a waist flap portions WF extending from the longitudinal X ₁ of the edge of the absorbent member 4 in the same direction X ₁ outward. Waist flap portions WF is a portion consisting of members extending outwardly in the same direction X ₁ than the edges of the longitudinal X ₁ of the absorbent body 4. Waist flap portions WF in the present embodiment is composed of the absorbent body 4 of the end cuff-forming sheet 15b extending outward in the longitudinal direction X ₁ from the edge, the topsheet 12 and the backsheet 13. These sheets are joined to each other by known joining means such as an adhesive, a heat seal, and an ultrasonic seal at the extending portion of the absorber 4 from the edge. The waist flap portion WF corresponds to the waist circumference of the wearer when the diaper 1 is worn.

In the diaper 1 of the present embodiment, as shown in FIG. 1, the waist flap portion WF of the rear section B, waist elastic member 19 are disposed under tension so as to extend in the transverse direction Y _1. Due to the contraction of the waist elastic member 19, waist gathers are formed on the portion arranged on the waist portion on the back side of the wearer. Waist elastic member 19 in the present embodiment, between the topsheet 12 and backsheet 13 in the waist flap portions WF, and is fixed in a stretched state along the transverse direction Y _1. The diaper 1 may have the waist elastic member 19 on the waist flap portion WF on the ventral side portion A. Waist elastic member 19 in the present embodiment, the stretching direction is the same as the transverse direction Y ₁ of the diaper 1.

The diaper 1 includes a skin contact sheet 10 that comes into contact with the wearer's skin when the diaper is worn. The skin contact sheet 10 has a concavo-convex region in which a plurality of convex portions and concave portions are formed, and the concavo-convex region, more specifically, the convex portion abuts on the wearer's skin in the wearing state.
In the diaper 1 of the present embodiment, the surface sheet 12 is a skin contact sheet 10, and the surface sheet 12 has an uneven region on the skin facing surface.

Topsheet 12, i.e. the skin contact sheet 10 of the present embodiment, as shown in FIG. 3, a pair of side regions located on either side of the central region M and the central region M located in the center of the lateral direction Y ₁ S , S. Each of the central region M and the pair of side regions S and S has a concavo-convex region, and the convex portions and the concave portions are formed in different arrangement patterns in both the central region M and S. Hereinafter, the uneven region P in the central region M is referred to as a “central uneven region P”, and the uneven region PS in the side region S is referred to as a “side uneven region PS”.

The skin contact sheet 10 of the present embodiment has a central uneven region P having a first direction Y and a second direction X orthogonal to the first direction Y. The first direction Y in this embodiment coincides with the transverse direction Y ₁ of the diaper 1, the second direction X coincides with the longitudinal direction X ₁ of the diaper 1. The central uneven region P is formed over the entire area of the central region M.
The central uneven region P has a plurality of convex portions 41 having a length in the first direction Y longer than the length in the second direction X. Hereinafter, the convex portion 41 long in the first direction Y is also referred to as a “long convex portion 41”. The uneven region P may have a plurality of long convex portions 41 and a plurality of concave portions 31 located between the long convex portions 41 in either the first direction Y or the second direction X.

The long convex portion 41 of the present embodiment has a substantially elliptical shape in a plan view, its long axis direction coincides with the first direction Y, and its minor axis direction coincides with the second direction X. There is.
As shown in FIGS. 3 and 4, the central uneven region P is formed with the long convex portions 41 dispersed in the first direction Y and the second direction X.
More specifically, as shown in FIG. 3, the long convex portions 41 are arranged in a staggered manner, and a vertical convex portion row R5 in which a plurality of long convex portions 41 are arranged along the second direction X is formed. A plurality of rows are formed in the first direction Y.
In the vertical convex portion rows R5 adjacent to each other in the first direction Y, the arrangement positions of the long convex portions 41 are deviated by half a pitch from the second direction X. The long convex portions 41 of the vertical convex portion rows R5 adjacent to each other in the first direction Y are arranged so that the portions of the long convex portions 41 overlap each other in the second direction X.
The vertical convex portion rows R5 in which the positions of the long convex portions 41 in the second direction X coincide with each other are formed at equal intervals in the first direction Y. With such a configuration, the sizes of the long convex portion 41 and the large concave portion 31, which will be described later, can be easily made uniform, and the feel and breathability of the uneven region P can be further improved.
Further, in the central uneven region P, a plurality of lateral convex portion rows R6 in which a plurality of long convex portions 41 are arranged along the first direction Y are formed in a plurality of rows in the second direction X. The laterally convex portions R6 whose positions of the long convex portions 41 in the first direction Y coincide with each other are formed at equal intervals in the second direction X.

In the present embodiment, the central uneven region P has a plurality of recesses 31 and 33 located between the long convex portions 41 in the first direction Y and the second direction X. The central uneven region P has two types of recesses 31 and 33 having different sizes. Hereinafter, the concave portion 31 having a larger size is referred to as a "large concave portion 31", and the concave portion 33 having a smaller size is referred to as a "small concave portion 33".

In the present embodiment, the central concavo-convex region P is between the edges of the long convex portions 41 in the vertical convex portion row R5 in the second direction X, and is the first of the long convex portions 41 in the lateral convex portion row R6. A large recess 31 is provided between the edges in the direction Y.
The large concave portion 31 of the present embodiment has a low basis weight portion 32 having a smaller basis weight of the fiber material than the long convex portion 41. The low basis weight portion 32 may be a low volume fiber portion in which the basis weight of the fiber material is smaller than that of the long convex portion 41 and the fiber material is present, and the fiber material is not present and the skin contact sheet is present. It may be an opening that penetrates 10. From the viewpoint of facilitating the deformation of the long convex portion 41 described later, it is preferable that the low basis weight portion 32 has the above-mentioned opening.
The large recess 31 of the present embodiment has a high-density portion 35 in which the fiber material is densified by embossing or the like on the peripheral edge portion of the low basis weight portion 32 [see the cross-sectional view of FIG. 5 (a)]. .. Instead, the large recess 31 does not have to have the high density portion 35 on the peripheral edge portion of the low basis weight portion 32. In the plan views of FIGS. 4 and 5, the high-density portion 35 is not shown.

The low basis weight portion 32 formed in the large recess 31 is also arranged in a staggered manner as shown in FIGS. 3 and 4. More specifically, in the plurality of low basis weight portions 32, the vertical direction low basis weight portion rows R1 arranged along the second direction X are intermittently formed in a plurality of rows in the first direction Y. In the vertical low basis weight section rows R1 adjacent to each other in the first direction Y, the arrangement position of the low basis weight section 32 is shifted in the second direction X by half a pitch.
The plurality of rows of vertically low basis weight section rows R1 are formed at equal intervals in the first direction Y. When the sizes of the low basis weight portions forming the low basis weight portion row are different, the distance between the vertical low basis weight portion rows R1 in the first direction Y is such that the vertical low basis weight portion row R1 is used. It is the distance between the center lines that divide into two equal parts in the first direction Y.
Further, in the central uneven region P, a plurality of horizontal low basis weight section rows R2 in which a plurality of low basis weight portions 32 are arranged along the first direction Y are formed in a plurality of rows in the second direction X.
FIG. 4 shows a region in which the vertical low basis weight section row R1 and the vertical convex section row R5 overlap in the first direction Y with reference numerals f.

In the central uneven region P, the long convex portion 41 and the large concave portion 31 are formed in a state of being alternately arranged in the first direction Y and the second direction X. That is, a plurality of vertical concavo-convex rows R10 in which the long convex portions 41 and the large concave portions 31 are alternately arranged along the second direction X are formed along the first direction Y.
Further, in the vertical uneven rows R10 adjacent to each other in the first direction Y, the arrangement position of the long convex portion 41 and the arrangement position of the large concave portion 31 are deviated by half a pitch in the second direction X.

The central concave-convex region P of the present embodiment has a pair of small concave portions 33, 33 sandwiching the long convex portion 41 in the second direction X on both sides of the large concave portion 31 in the first direction Y. The pair of small recesses 33, 33 are in series along the second direction X, and a plurality of rows of the pair of small recesses 33, 33 are formed in the first direction Y at regular intervals. In the row consisting of a pair of small recesses 33, 33 adjacent to each other in the first direction Y, the positions of the small recesses 33 forming the row coincide with each other in the second direction X.

In the diaper 1, elastic members are arranged along the first direction Y on the non-skin facing surface side of the skin contact sheet 10. In the present embodiment, the waist elastic member 19 is arranged in an extended state along the first direction Y on the non-skin facing surface side of the skin contact sheet 10 which is the surface sheet 12, and the waist elastic member 19 is arranged. Is adapted to exhibit elasticity along the first direction Y.
In the diaper 1 of the present embodiment, the central uneven region P and the waist elastic member 19 overlap in the waist flap portion WF.

The long convex portion 41 of the present embodiment has a portion a that overlaps the large concave portion 31 in the first direction Y [see FIG. 5 (a)]. When the waist elastic member 19 exhibiting elasticity in the first direction Y contracts, the central uneven region P is compressed in the first direction Y, and the skin contact sheet 10 is deformed. Specifically, since the large concave portion 31 is compressed in the first direction Y, the portion a of the long convex portion 41 that overlaps the large concave portion 31 in the first direction Y is also compressed in the first direction Y. The long convex portion 41 compressed in the first direction Y is deformed so that the portion a overlapping the large concave portion 31 and the first direction Y bends inward [see FIG. 5 (b)]. Such deformation due to the contraction of the elastic member is hereinafter referred to as "inner folding", and the portion capable of inward folding is also referred to as "inner folding portion a".
As described above, in the diaper 1 of the present embodiment, by partially deforming the long convex portion 41, it is effective that the entire convex portion is crushed by the contraction of the elastic member 19 without impairing the touch by the long convex portion 41. Can be suppressed. As a result, the convex shape of the long convex portion 41 is well maintained in the central uneven region P, so that the skin contact sheet 10 is prevented from coming into close contact with the wearer's skin, and the inside of the diaper 1 in the worn state is suppressed. It also suppresses stuffiness and provides excellent breathability.
From the viewpoint of further improving the touch and breathability, it is preferable that the elongated convex portion 41 undergoes inward bending due to the contraction of the elastic member 19, and returns to the state before the inward folding due to the extension of the elastic member 19.

In the central uneven region P of the present embodiment, the long convex portion 41 overlaps with the vertical low basis weight portion row R1 in the first direction Y. The large recess 31 has a low basis weight portion 32 having lower rigidity than other portions. With such a configuration, the large recess 31 is easily compressed by the first direction Y due to the contraction of the elastic member 19 [see FIG. 5 (b)]. Along with this compression, the portion a of the long convex portion 41 that overlaps the large concave portion 31 in the first direction Y is also easily compressed by the same direction Y, so that the long convex portion 41 is more likely to be bent inward [FIG. 5 (FIG. 5). b) See].
In the present embodiment, the inner bent portion a is located closer to the skin facing surface than the low basis weight portion 32. Further, the elastic member 19 is located on the non-skin facing surface side with respect to the low basis weight portion 32.

From the viewpoint of improving the air permeability in the diaper 1, it is preferable that the inward bending occurs at a plurality of long convex portions 41. For example, it is preferable that the uneven region P has a plurality of regions f in which the vertical low basis weight portion row R1 and the vertical convex portion row R5 overlap in the first direction Y.

From the viewpoint of more easily causing inward bending in the long convex portion 41, the elongation stress of the elastic member 19 is preferably 8 cN / 10 mm or more, more preferably 10 cN / 10 mm or more, and preferably 50 cN / 10 mm or less. It is preferably 40 cN / 10 mm or less, preferably 8 cN / 10 mm or more and 50 cN / 10 mm or less, and more preferably 10 cN / 10 mm or more and 40 cN / 10 mm or less. The elongation stress is measured by the following method.

[Measurement method of elongation stress]
From the unfolded and stretched diaper, an elastic member arranged at a position overlapping the uneven region P and exhibiting elasticity in the elastic member is cut out by 50 mm in the expansion / contraction direction. This cut-out sample piece is sandwiched between a pair of chucks in a Tensilon tensile tester (“RTC-1210A” manufactured by ORIENTEC). The distance between the chucks at this time is 10 mm. Next, the sample piece is extended at a speed of 50 mm / min until the distance between the chucks becomes 40 mm, and then the tensile load (cN / 10 mm) when the distance between the chucks is returned to 38 mm is measured. Such measurement is repeated three times, and the average of these (the average of the tensile load when the distance between the chucks is returned to 38 mm) is defined as the elongation stress (cN / 10 mm).

From the viewpoint of more easily causing inward folding in the long convex portion 41, when the low basis weight portion 32 is a low volume fiber portion, the basis weight of the fiber material in the low basis weight portion 32 is within the following range. Is preferable.
The basis weight of the fiber material in the low basis weight portion 32 is preferably 10% or less, more preferably 20% or less, with respect to the basis weight of the fiber material in the long convex portion 41.
The basis weight of the fiber material in the low basis weight portion 32 is preferably 30 g / m ² or less, more preferably 20 g / m ² or less.

The inwardly bent portion a in the inwardly bent long convex portion 41 is formed by a valley portion v recessed inside the long convex portion 41 and a mountain portion m located on the skin facing surface side of the valley portion. [See FIG. 5 (b)]. From the viewpoint of facilitating the formation of the mountain portion m, it is preferable that the long convex portion 41 has a portion in which the constituent fibers of the skin contact sheet 10 are oriented along the second direction X. Since the portion oriented along the second direction X is less likely to receive a force for compressing the low basis weight portion 32, that is, a force for contracting in the first direction Y, it is easy to form a mountain portion m in the inwardly bent portion a.
Further, from the viewpoint of making it easier to form the valley portion v, it is preferable that the long convex portion 41 has a portion in which the constituent fibers of the skin contact sheet 10 are oriented along the first direction Y. Since the portion oriented along the first direction Y is susceptible to a force for compressing the low basis weight portion 32, that is, a force for contracting in the first direction Y, it is easy to form a valley portion v in the inwardly bent portion a.
From the viewpoint of forming the inwardly folded portion a more easily, the long convex portion 41 is oriented along the first direction Y and the portion where the constituent fibers of the skin contact sheet 10 are oriented along the first direction Y. It is preferable that the constituent fibers have portions oriented along the second direction X on both sides of the portion in the first direction Y.

The orientation of the fibers in the sheet can be confirmed by, for example, the following method. First, the sheet to be evaluated is taken out from the absorbent article by peeling it off using a cold spray or the like. The taken-out sheet is cut into a rectangular shape in a plan view having a length of 2 cm along the second direction X and a length of 2 cm along the first direction Y using a cutter or the like, and this is used as a measurement piece. The measuring piece is cut out so as to include the long convex portion 41. Then, using a microscope (for example, a digital microscope VHX-1000 manufactured by KEYENCE CORPORATION), the long convex portion of the measuring piece is observed at a magnification of 60 to 200 times. For each of the arbitrary fibers observed in a certain observation area (for example, 1 mm square), two points are set so that the length of the fiber is maximized in the area. Next, the angle formed by the straight line connecting both ends and the first direction Y is measured. This measurement is performed for at least three observation regions, and the fiber orientation direction is obtained from the arithmetic mean value of the angles measured for a total of 30 or more fibers. The fiber orientation direction is determined to be oriented in the first direction Y when the angle formed with the first direction Y is 45 degrees or less, and in the second direction X when the angle formed with the first direction Y exceeds 45 degrees. Judge to be oriented. In the measurement of fiber orientation, it is preferable to observe 10 or more fibers in the region at a magnification that can be confirmed.

From the viewpoint of more easily causing inward bending in the long convex portion 41, it is preferable that the long convex portion 41 satisfies the following formula (1) when the elastic member 19 is extended to the maximum.
La> H1 ... (1)
La: Half of the length L1 of the long convex portion 41 in the first direction Y H1: Height of the long convex portion 41 The length L1 of the long convex portion 41 in the first direction Y is the length L1 of the long convex portion 41 in the same direction Y. Maximum length (see FIG. 4).
Further, the H1 is measured using a thickness measuring device with a load of 0.05 kPa applied to the skin contact sheet 10. As the thickness measuring instrument, for example, a laser displacement meter (LK-080 manufactured by KEYENCE) can be used.

From the same viewpoint as above, when half (L1 / 2) of the length of the long convex portion 41 in the first direction Y is La, and the height of the long convex portion 41 is H1 [see FIG. 5 (a)]. La / H1, which is the ratio of La to H1, is preferably 1.5 or more, more preferably 2.0 or more, preferably 15.0 or less, more preferably 10.0 or less, and more preferable. Is 1.5 or more and 15.0 or less, more preferably 2.0 or more and 10.0 or less.

From the same viewpoint as above, when the length of the long convex portion 41 in the first direction Y is L1 (see FIG. 4) and the length of the long convex portion 41 in the second direction X is L2 (see FIG. 4). , L1 / L2, which is the ratio of L1 to L2, is preferably 1.5 or more, more preferably 1.8 or more, preferably 5.0 or less, more preferably 3.0 or less, and more preferable. Is 1.5 or more and 5.0 or less, more preferably 1.8 or more and 3.0 or less.

From the viewpoint of further compressing the low basis weight portion 32 and making it easier to cause inward bending in the long convex portion 41, the length of the long convex portion 41 in the second direction X is set to L2 (see FIG. 4), and the second When the length of the low basis weight portion 32 in the direction X is L5 (see FIG. 4), L5 / L2, which is the ratio of L5 to L2, is preferably 0.3 or more, more preferably 0.4 or more. It is preferably 0.8 or less, more preferably 0.7 or less, preferably 0.3 or more and 0.8 or less, and more preferably 0.4 or more and 0.7 or less.

From the viewpoint of making it easier to receive the force for compressing the low basis weight portion 32 in the first direction Y and making it easier to cause inward bending in the long convex portion 41, the length of the long convex portion 41 in the second direction X is set. When L2 (see FIG. 4) and the length of the low basis weight portion 32 in the first direction Y is L6 (see FIG. 4), L6 / L2, which is the ratio of L6 to L2, is preferably 0.3 or more. , More preferably 0.4 or more, preferably 1.5 or less, more preferably 1.0 or less, and preferably 0.3 or more and 1.5 or less, more preferably 0.4 or more 1. It is 0 or less.

The long convex portion 41 of the present embodiment has only one portion a overlapping the large concave portion 31 in the first direction, that is, an inwardly bent portion a in the second direction X.
When the length of the long convex portion 41 in the first direction Y is L1 (see FIG. 4) and the length of the inwardly bent portion a in the first direction Y is L10 [see FIG. 5 (b)], L10 with respect to L1. The ratio of L10 / L1 is preferably 0.2 or more, more preferably 0.3 or more, preferably 0.8 or less, more preferably 0.7 or less, and preferably 0.2. It is 0.8 or more, more preferably 0.3 or more and 0.7 or less. The length L10 of the inwardly bent portion a in the first direction Y is the maximum length of the valley portion v in the inwardly bent long convex portion 41 along the first direction Y [see FIG. 5 (b)].
When the long convex portion 41 has a plurality of inwardly bent portions a along the first direction Y as in the third and fourth embodiments described later, the length of the inwardly bent portion a in the first direction Y. L10 is the sum of the lengths of the plurality of inwardly bent portions a in the first direction Y. For example, as in the third embodiment, one long convex portion 41, the two inner fold portion a _1, when it has a _2, the length L10 of the inner folding portion in the first direction Y is is the sum of the length in the first direction Y of the two inner folding portion a _1, a _2.

From the viewpoint of further improving the touch in the uneven region P, the dimensions of the long convex portion 41 and the low basis weight portion 32 are preferably within the following ranges.
The length L1 (see FIG. 4) of the long convex portion 41 in the first direction Y is preferably 4.0 mm or more, more preferably 6.0 mm or more, and preferably 35.0 mm or less, more preferably 25. It is 0 mm or less, preferably 4.0 mm or more and 35.0 mm or less, and more preferably 6.0 mm or more and 25.0 mm or less.
The length L2 (see FIG. 4) of the long convex portion 41 in the second direction X is preferably 2.0 mm or more, more preferably 3.0 mm or more, and preferably 7.0 mm or less, more preferably 5. It is 0 mm or less, preferably 2.0 mm or more and 7.0 mm or less, and more preferably 3.0 mm or more and 5.0 mm or less.
The height H1 of the long convex portion 41 [see FIG. 5A] is preferably 0.5 mm or more, more preferably 0.8 mm or more, and preferably 4.0 mm or less, more preferably 3.0 mm or less. It is preferably 0.5 mm or more and 4.0 mm or less, and more preferably 0.8 mm or more and 3.0 mm or less.

The length L6 (see FIG. 4) of the low basis weight portion 32 in the first direction Y is preferably 0.8 mm or more, more preferably 1.0 mm or more, and preferably 10.0 mm or less, more preferably 7. It is 0.0 mm or less, preferably 0.8 mm or more and 10.0 mm or less, and more preferably 1.0 mm or more and 7.0 mm or less.
The length L5 (see FIG. 4) of the low basis weight portion 32 in the second direction X is preferably 0.8 mm or more, more preferably 1.0 mm or more, and preferably 6.0 mm or less, more preferably 4 It is 0.0 mm or less, preferably 0.8 mm or more and 6.0 mm or less, and more preferably 1.0 mm or more and 4.0 mm or less.

The central uneven region P of the present embodiment has a small recess 33 together with a large recess 31 (see FIG. 3). The small recess 33 of the present embodiment has an opening as a low basis weight portion (not shown). The small recess 33 may not have a low basis weight portion.
In the long convex portion 41 of the present embodiment, even if the elastic member exhibiting elasticity in the first direction Y contracts, the portion sandwiched between the small concave portions 33 in the second direction X does not undergo inward bending. As described above, the central uneven region P may have a concave portion 33 that does not contribute to the inward bending of the long convex portion 41.
The concave portion 33 that does not contribute to the inward bending of the long convex portion 41 does not have, for example, a concave portion having a length of less than 0.5 mm in the first direction Y or a low basis weight portion, and is consolidated by embossing or the like. Examples thereof include formed recesses.

In the diaper 1 of this embodiment, the waist elastic member 19 is stretchable along a lateral direction Y _1. And the waist elastic member 19 and the central irregular region P is, the end portion of the diaper 1 in the longitudinal direction X _1, in particular overlaps with waist flap portion WF of the rear section B. In the diaper 1 of the present embodiment, the central uneven region P having the long convex portion 41 that can be folded inward is arranged around the waist (waist portion) of the wearer in the wearing state, so that the skin contact sheet 10 is the waist. In addition to being easy to fit around, the uneven region P maintains better air permeability and is less likely to cause stuffiness.

In the diaper 1 of the present embodiment, as shown in FIG. 6, the waist elastic member 19 is arranged in an extended state between the front surface sheet 12 which is the skin contact sheet 10 and the back surface sheet 13 in the waist flap portion WF. The surface sheet 12 and the waist elastic member 19 are overlapped with each other in direct contact with each other. Such a configuration is preferable in that the contraction force (elongation stress) of the elastic member 19 can be easily applied to the large concave portion 31 or the low basis weight portion 32, and the inward bending of the long convex portion 41 can be more easily generated.

The skin contact sheet 10 and the elastic member arranged so as to exhibit elasticity along the first direction are in a state in which another member is interposed between the skin contact sheet 10 and the elastic member. May overlap with. For example, as shown in FIGS. 7 and 8, the surface sheet 12 which is the skin contact sheet 10 and the surface sheet 12 exhibit elasticity along the first direction Y with the absorber 14 interposed therebetween. The arranged elastic member 19 may overlap with the arranged elastic member 19. In this case, from the viewpoint of imparting the contractile force (elongation stress) of the elastic member 19 to the large recess 31 or the low basis weight portion 32, the absorbent core 14a is the core low basis weight portion 14c having a low basis weight of the absorbent material. It is preferable that the elastic member 19, the uneven region P having the long convex portion 41 that can be folded inward, and the core low basis weight portion 14c overlap each other.
The core low basis weight portion 14c is a low product fiber in which the basis weight of the material for forming the absorbent core 14a is smaller than that of the portion other than the core low basis weight portion 14c in the absorbent core 14a and the forming material is present. It may be a portion, or it may be a penetration portion that does not have a forming material and penetrates the absorbent core 14a.

From the viewpoint of imparting a contraction force (elongation stress) of the elastic member 19 to the low basis weight portion 32, when the core low basis weight portion 14c is a low fiber section, the absorbent core 14a is the core low basis weight portion 14c. The basis weight of the absorbent material in the above is preferably more than 0%, more preferably 20% or more, and preferably 80% with respect to the basis weight of the absorbent material in the portion other than the core low basis weight portion 14c. Hereinafter, it is more preferably 60% or less, preferably more than 0% and 80% or less, and more preferably 20% or more and 60% or less.
From the same viewpoint as above, when the core low basis weight portion 14c is a low volume fiber portion, the basis weight of the absorbent material in the core low basis weight portion 14c is preferably ^{more than 0 g / m 2} and more preferably 40 g / g /. m is ² or more, and preferably 500 g / ^{m 2} or less, more preferably 400 g / ^{m 2} or less, and preferably 0 g / ^{m 2} ultra 500 g / ^{m 2} or less, more preferably 40 g / ^{m 2} or more 400 g / It is m ² or less.

In the embodiment shown in FIG. 7, the first direction Y of the long convex portion 41 and the extending direction of the elastic member 19 coincide with _{the lateral direction Y 1 of the diaper.} On the other hand, the core low basis weight portion 14c extends in the longitudinal direction X _1.
In the embodiment shown in FIG. 8, the first direction Y of Nagatotsu portion 41, the extending direction of the elastic member 19, and the extending direction of the core low basis weight portion 14c is coincident with the longitudinal direction X ₁ of the diaper .. As described above, when the first direction Y of the long convex portion 41 in the uneven region P and the extending direction of the core low basis weight portion 14c match, the fit of the skin contact sheet 10 can be further improved. Preferred in terms of points.

As shown in FIGS. 7 and 8, the horizontal by the contraction of the stretchable elastic members 19 along the direction Y _1, may be one inner fold occurs inside the convex portion 41 can be folded in the irregular region P, the contraction of the longitudinally along the direction X ₁ stretchable elastic member, the inner folding may occur on the convex portion 41 can be folded inside the irregular region P. That is, the first direction of the long convex portion 41 in the uneven region P may be made to coincide with _{the horizontal direction Y 1} of the diaper 1, or the first direction may be made to coincide _{with the vertical direction X 1.}
In the embodiment shown in FIG. 8, the vertical direction X ₁ stretchable elastic members along the irregular region P having a Nagatotsu portion 41 capable folded inner is overlapped at the center portion of the diaper 1 in the longitudinal direction X ₁ It is more preferable that the diapers overlap with each other at the lower crotch C. With such a configuration, the adhesion between the skin contact sheet 10 and the wearer's skin is more effectively suppressed, and the stuffiness caused by excrement such as urine absorbed by the absorber 14 and once absorbed by the absorber 14. It is possible to further suppress the so-called liquid return, in which the liquid is transferred to the surface sheet 12 side due to the influence of the wearer's body pressure or the like.

In the skin contact sheet 10 of the present embodiment, the side uneven region PS has convex portions 47 and concave portions 37 arranged in a staggered pattern. The convex portion 47 in the side concavo-convex region PS may be inwardly folded due to the contraction of the elastic member, or may not be internally folded due to the contraction of the elastic member.
When the convex portion 47 in the side uneven region PS has an inward fold, the above description of the central uneven region P is appropriately applied.

9 to 13 show other embodiments of the skin contact sheet according to the present invention. Regarding the skin contact sheet of the second to sixth embodiments to be described later, the components different from the embodiments (first embodiment) shown in FIGS. 1 to 8 will be mainly described, and the same components are designated by the same reference numerals. And the explanation is omitted. The description of the first embodiment is appropriately applied to the components not particularly described.

As shown in FIGS. 5 and 6, the skin contact sheet 10 of the first embodiment described above has a single-layer structure, and the inside of the long convex portion 41 is solid. The non-skin facing surface of the skin contact sheet 10 is flat in an extended state along the first direction Y. The "extended state along the first direction Y" means a state in which the skin contact sheet 10 having the convex portion 41 capable of inward folding is extended as follows.
The unfolded diaper 1 is spread along the first direction Y until it reaches the design dimensions (the same as the dimensions when it is unfolded in a plane with the influence of the elastic member completely removed), and the diaper 1 comes into contact with the skin. Using an oil-based pen, the sheet 10 is marked with two marks at regular intervals L0 (eg, 100 mm) in the first direction Y. Next, the skin contact sheet 10 is taken out from the diaper 1, and the skin contact sheet 10 is extended in the first direction Y until the distance between the two marks on the sheet 10 becomes the length of the fixed interval L0. This state is referred to as an "extended state along the first direction Y".

In the skin contact sheet 10a of the second embodiment, instead of the single-layer structure sheet, the laminated first sheet 21 and the second sheet 22 are joined to each other at a plurality of joint portions 36 as shown in FIG. It may be a composite sheet. In this case, the first sheet 21 forms a long convex portion 41 protruding in a direction away from the second sheet 22 at a portion other than the concave portions 31 and 33.
In the extended state along the first direction Y, the surface of the composite sheet 10a formed by the second sheet 22, that is, the non-skin facing surface is flat. In such a composite sheet 10a, the inside of the long convex portion 41 is hollow and has a two-layer structure of the first sheet 21 and the second sheet 22, so that the compression force of the low basis weight portion 32 is the first sheet. It is easy to concentrate on the 21 and the long convex portion 41 formed by the first sheet 21 is likely to be bent inward.

The skin contact sheets 10b and 10c of the third and fourth embodiments shown in FIGS. 10 and 11 have different patterns of the uneven region P from the skin contact sheets 10 of the first embodiment.
As shown in FIG. 10, in the skin contact sheet 10b of the third embodiment, the long convex portions 41 are arranged in a staggered pattern, and four low basis weights are formed between the long convex portions 41 in the second direction X. A recess 31a having a portion 32a is formed. A plurality of vertical concavo-convex rows R11 in which the long convex portions 41 and the concave portions 31a are alternately arranged along the second direction X are formed along the first direction Y.
In the third embodiment, the vertical concavo-convex rows R11 adjacent to each other in the first direction Y are offset from each other by half a pitch in the second direction X at the arrangement position of the long convex portion 41 and the arrangement position of the concave portion 31a.
Further, two sets of two low basis weight portions 32a (a pair of low basis weight portions 32a and 32a) arranged along the second direction X are arranged between the long convex portions 41 in the first direction Y. These four low basis weight portions 32a and the long convex portions 41 are alternately arranged along the second direction X.
The vertical concavo-convex row R11 is a long-convex portion row R4 composed of a plurality of long-convex portions 41 intermittently arranged along the second direction X, and a pair of long-convex portions R4 arranged in the second direction X between the long-convex portions 41. The low basis weight portions 32a and 32a are composed of two rows of low basis weight portion rows R3 intermittently arranged along the same direction X.
In the third embodiment, in the vertical concavo-convex row R11, the long convex portions 41 overlap the two low basis weight portions 32a arranged in the first direction Y and the regions f ₁ and f ₂ in the first direction Y. Have. In other words, the long convex portion 41 has two regions that overlap with the low basis weight portion 32a in the first direction Y. _{In the long convex portion 41, in the regions f 1} and f ₂ overlapping the low basis weight portions 32a and 32a in the first direction Y, the elastic member 19 preferentially causes inward bending. That is, the long convex portion 41 of the third embodiment _{has a plurality of inwardly bent portions a 1} and a ₂ along the first direction Y, and is caused by the contraction of an elastic member that exhibits elasticity in the first direction Y. folding the inner at a plurality of inner folding portion _a 1, _{a 2,} respectively occurs.

Long protrusion 41 in the third embodiment had a inner fold portion a _1, a ₂ of the two positions along the first direction Y, Nagatotsu unit 41 includes a first inner folding portion of three or more It may be held along one direction Y.
As shown in FIG. 11, in the skin contact sheet 10c of the fourth embodiment, the long convex portions 41 are arranged in a staggered pattern, and the large and low basis weight of a quadrangle is formed between the long convex portions 41 in the second direction X. A recess 31b having a portion 32b and four small low basis weight portions 32c located substantially diagonally outward of the large low basis weight portion 32b is formed. A plurality of vertical concavo-convex rows R13 in which the long convex portions 41 and the concave portions 31b are alternately arranged along the second direction X are formed along the first direction Y.
In the fourth embodiment, the vertical concavo-convex rows R13 adjacent to each other in the first direction Y are offset from each other by half a pitch in the second direction X at the arrangement position of the long convex portion 41 and the arrangement position of the concave portion 31b.
In the vertical uneven row R13, the large low basis weight portion 32b and the long convex portion 41 are alternately arranged along the second direction X.
Further, two small low basis weight portions 32c arranged on both sides of the first direction Y of the large low basis weight portion 32b are arranged along the second direction X, and these two low basis weight portions 32c and The long convex portions 41 are alternately arranged along the second direction X.
The vertical concavo-convex row R13 is a long-convex portion row R8 composed of a plurality of long-convex portions 41 intermittently arranged along the second direction X, and a pair of long-convex portions R8 arranged in the second direction X between the long-convex portions 41. Two rows of low basis weight sections R7 in which small low basis weight portions 32c and 32c are intermittently arranged along the same direction X, and large low basis weight section rows R9 intermittently arranged along the second direction X. It is composed of and.
In the fourth embodiment, the long convex portion 41 in the longitudinal direction uneven rows R13 is, in the first direction Y, a large low basis weight portion 32b and the region f ₄ overlaps the first direction _Y, and two small low basis It has three places of the amount portion 32c and the area _f 3 overlapped with the first direction Y, _{f 5.} In these three areas _{f 3,} f 4, _{f 5,} as in the third embodiment, preferentially the inner bending occurs by the contraction of the elastic member 19. That long convex portion 41 of the fourth embodiment, the inner folding portion a _3, a _4, a ₅ has three positions along the first direction Y, the elastic members expressing stretchable in a first direction Y by contraction, these three inner bending portion _{a 3,} a 4, _{a 5} inner fold in each occurs.

In the concave-convex region in the first to fourth embodiments, the long convex portion 41 and the concave portion 31 are arranged in a scattered spot shape, but each of the long convex portion 41 and the concave portion 31 is continuous in one direction. You may.
As shown in FIG. 12, the skin contact sheet 10d of the fifth embodiment has a ridge-shaped surface facing the skin. Specifically, the continuous convex portion 41a forming the ridge extending in the first direction Y and the continuous concave portion 31d forming the groove extending in the same direction as the continuous convex portion 41a alternate along the second direction X. Is located in. The skin facing surface of the skin contact sheet 10d has a corrugated uneven shape when viewed in a direction orthogonal to the extending direction of the continuous convex portion 41a and the continuous concave portion 31d (not shown).
The continuous recess 31d in the fifth embodiment intermittently has a plurality of low basis weight portions 32 along the first direction Y, and the low basis weight portion 32 in the continuous recess 31d adjacent to the second direction X. The arrangement positions match in the first direction Y. That is, a plurality of vertical concavo-convex rows R15 in which the continuous convex portions 41a and the low basis weight portions 32 of the continuous concave portions 31d are alternately arranged along the second direction X are formed along the first direction Y.
In the fifth embodiment, each successive protrusions 41a in the longitudinal direction uneven rows R15 arranged along the second direction X, includes a plurality of locations areas f ₉ of the low basis weight portion 32 overlaps in the same first direction Y There is. In the region f ₉ of a plurality of locations, as in the third embodiment, bending the inner preferentially occurs by the contraction of the elastic member 19. That long convex portion 41 of the fifth embodiment has a plurality of inner folding portion a ₉ along the first direction Y, by the contraction of the elastic members expressing stretchable in a first direction Y, the plurality inner fold occurs in each bending section a _9.

When the uneven region has the continuous convex portion 41a and the continuous concave portion 31d as in the fifth embodiment, the length L1 of the long convex portion in the first direction Y is the unit area of the continuous convex portion 41a. Assuming that the convex portion is per 30 mm square), the total length (30 mm) of the convex portion in the first direction Y is used.
The length of the sum L10 of the inner folding portion a ₉ in the first direction Y is when the continuous convex portion 41a assuming protrusions per unit area (30 mm square), present in the protrusions per the unit area the sum of the lengths in the first direction Y of the folded portion a ₉ among the. The first sum length in the direction Y L10 of such a folded portion a ₉ from each 10 consecutive protrusions 41a arbitrarily selected, further optionally the protrusions per unit area of the selected five locations It is an average value. In this case, "protruding portions per unit area", the number of inner folding portion a ₉ in the convex portion is set within a range such that the maximum number.

As shown in FIG. 13, the skin contact sheet 10e according to the sixth embodiment has a plurality of long convex portions 41b and concave portions 31d protruding toward the skin facing surface side, and the long convex portions 41b are non-skin facing. The surface side is open to form a space. In such a skin contact sheet 10e, the back side of the recess 31d, that is, the non-skin facing surface of the recess 31d protrudes toward the non-skin facing surface side, and when the skin contact sheet 10e is viewed from the non-skin facing surface side, The protruding portion on the back side of the concave portion 31d is a convex portion protruding toward the non-skin facing surface side. The recess 31d is open on the side facing the skin to form a space. These elongated convex portions 41b and concave portions 31d are arranged alternately and continuously along the entire surface of the skin contact sheet 10e along each of two different directions intersecting each other in a plan view.
In the sixth embodiment, the recess 31d has the above-mentioned low-stacked fiber portion as the low basis weight portion 32d.

The material for forming each part of the diaper in the above-described embodiment will be described in detail. As the back sheet 13 and the absorber 14, those conventionally used for the absorbent article can be used without particular limitation. As the back sheet 13, a liquid-impermeable resin film, a laminate of the resin film and a non-woven fabric, or the like can be used. As the absorbent core 14, as the absorbent core 14a, an aggregate of hydrophilic fibers such as wood pulp and a hydrophilized synthetic fiber, or an aggregate in which a water-absorbing polymer is retained can be used. Further, as the core wrap sheet 14b, the same one as the surface sheet 12 can be used. Further, as the leak-proof cuff forming sheet 15b, a water-repellent nonwoven fabric can be used.

As the surface sheet 12 which is the skin contact sheet 10, for example, a liquid-permeable non-woven fabric conventionally used for absorbent articles can be used. Examples of the non-woven fabric include air-through non-woven fabric, spunbond non-woven fabric, spunlace non-woven fabric, meltblown non-woven fabric, resin bond non-woven fabric, needle punch non-woven fabric and the like. It is also possible to use a laminated body in which two or more kinds of these non-woven fabrics are combined.

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.

Examples of the elastic members 15a, 16 and 19 described above include synthetic rubber such as styrene-butadiene, butadiene, isoprene and neoprene, natural rubber, EVA, elastic polyolefin and polyurethane. As the form of the elastic member, a thread-like (thread rubber, etc.) or a string-like (flat rubber, etc.) having a rectangular, square, circular, oval, or polygonal cross section, or a multifilament type thread-like member, etc. It can be preferably used.

Further, the elastic sheet 130 may be used as the elastic members 15a, 16 and 19 described above. As shown in FIG. 14, the stretchable sheet 130 is a non-woven fabric in which a plurality of elastic filaments 131 arranged so as to extend in one direction without intersecting each other are stretchable over their entire lengths in a substantially non-stretched state. It is joined to 132 and 133.

Each elastic filament 131 is joined to the first and second nonwoven fabrics 132 and 133. The first nonwoven fabric 132 and the second nonwoven fabric 133 may be of the same type or different types. The same type of nonwoven fabric as used herein means nonwoven fabrics having the same manufacturing process of the nonwoven fabric, types of constituent fibers of the nonwoven fabric, fiber diameters and lengths of the constituent fibers, thickness and basis weight of the nonwoven fabric, and the like. When at least one of these is different, it is said to be a different type of non-woven fabric. "Elasticity" means the original length when the force is released from the state where it can be stretched and is stretched 100% with respect to the original length (the length becomes 200% of the original length). It refers to the property of returning to a length of 125% or less.

Each of the non-woven fabrics 132 and 133 is expandable. Each of the nonwoven fabrics 132 and 133 can be extended in the same direction as the elastic filament 131 extends. Stretchable means that (a) the constituent fibers of the non-woven fabrics 132 and 133 are elongated, and (b) the constituent fibers themselves are not elongated, but the fibers bonded at the intersections are separated from each other, or the fibers are separated from each other. This includes cases where the three-dimensional structure formed of a plurality of fibers is structurally changed due to bonding or the like, the constituent fibers are torn off, or the slack of the fibers is stretched, and the non-woven fabric as a whole is stretched.

The nonwoven fabrics 132 and 133 may already be stretchable in the state of the original fabric before being joined to the elastic filament 131. Alternatively, it is not stretchable in the state of the original fabric before being joined to the elastic filament 131, but is processed so as to be stretchable after being joined to the elastic filament 131 so that it can be stretched. May be good. Specific methods for making the nonwoven fabric stretchable include heat treatment, inter-roll stretching, biting stretching with tooth grooves and gears, and tensile stretching with a tenter.

Each elastic filament 131 is substantially continuous over the entire length of the stretchable sheet 130. The elastic filament 131 contains an elastic resin. The elastic filaments 131 are arranged so as to extend in one direction without intersecting each other. However, it is permissible for the elastic filaments 131 to unintentionally intersect due to the unavoidable fluctuations in the manufacturing conditions of the stretchable sheet 130. The elastic filaments 131 may extend linearly or meander as long as they do not intersect each other.

Further, the above-mentioned elastic sheet 130 has a structure in which an elastic filament 131 is arranged between two expandable nonwoven fabrics 132 and 133, but instead of the elastic filament 131, one stretchable nonwoven fabric is used on one surface. An elastic sheet having a structure in which the elastic filament 131 is arranged may be used. In this case, the elastic filament 131 is in an exposed state.

The skin contact sheet of the present invention can be manufactured by using a known manufacturing method.
For example, the skin contact sheet 10 of the first embodiment is manufactured by a manufacturing method including a step of imparting an uneven shape to the sheet to form a concave portion and a convex portion, and a step of forming a low basis weight portion in the concave portion. Can be manufactured. In such a manufacturing method, a sheet is introduced between the embossed convex rolls and the flat rolls arranged so as to be opposed to each other to give an uneven shape, and then the concave portions having the uneven shape are subjected to ultrasonic treatment or the like to reduce the basis weight. Form a part.
Further, the composite sheet (skin contact sheet 10a) according to the second embodiment can be manufactured by the manufacturing method described in JP-A-2018-099883. Such a manufacturing method includes a step of imparting an uneven shape to the first sheet 21, a step of superimposing the second sheet 22 on the first sheet 21, and an ultrasonic wave applying ultrasonic vibration to both sheets 21 and 22. Provided with a processing step. In the step of imparting the uneven shape, the first sheet 21 is introduced into the meshing portion of both rolls while rotating the first roll and the second roll having the unevenness that meshes with each other on the peripheral surface portion, and the first roll is deformed into the uneven shape. In the stacking step, the first sheet 21 deformed into an uneven shape is conveyed while being held on the first roll, and the second sheet 22 is superimposed on the first sheet 21 being conveyed. In the ultrasonic treatment step, both sheets 21 and 22 that are overlapped are sandwiched between the convex portion of the first roll and the ultrasonic horn of the ultrasonic fusion machine, and ultrasonic vibration is applied to bring them into contact with the skin. A low basis weight portion 32 having an opening penetrating the sheet 10a is formed.

In addition to the ultrasonic treatment, a known cutting means capable of partially cutting a sheet deformed into an uneven shape can be used for forming the low basis weight portion 32 having holes. Examples of the cutting means include a cutting device provided with a cutter roll and an anvil roll having a cutting blade having a shape corresponding to the contour of the opening on the outer peripheral surface of the cutter roll.

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 skin contact sheet 10 in the first embodiment has a central uneven region P and side uneven regions PS located on both sides thereof, but the entire surface of the skin contact sheet 10 is covered. The long convex portion 41 and the concave portions 31 and 33 having the same pattern as the central uneven region P may be formed.
Further, the uneven region P may have a region that overlaps with the elastic member 19 and a region that does not overlap with the elastic member 19. In this case, the convex portion in the region overlapping with the elastic member 19 and the convex portion in the region not overlapping with the elastic member 19 may have the same width or different widths in the first direction Y. For example, the width of the convex portion in the region overlapping with the elastic member 19 in the first direction is smaller than the width of the convex portion in the region not overlapping with the elastic member 19 in the first direction.

Further, the shape of the low basis weight portion 32 can be any shape long in the first direction Y. For example, examples of the shape of the low basis weight portion 32 include a rectangle, an ellipse, an oval, a triangle, a pentagon, a hexagon, a star, a heart, and the like.
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 sanitary napkin. 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>
Absorption having an uneven region, provided with a skin contact sheet in which the uneven region abuts on the wearer's skin in the wearing state, and has a vertical direction corresponding to the front-back direction of the wearer and a horizontal direction orthogonal to the vertical direction. It ’s a sex item,
The uneven region has a first direction and a second direction orthogonal to the first direction, and a convex portion having a length longer in the first direction than the length in the second direction and a convex portion in the first direction or the second direction. It has a plurality of concave portions located between the convex portions, respectively, and has a plurality of concave portions.
An absorbent article in which an elastic member is arranged along a first direction on the non-skin facing surface side of the skin contact sheet.

<2>
The absorbent article according to <1>, wherein the convex portion is deformed so that a portion sandwiched between the concave portions in the second direction is bent toward the inside of the convex portion due to the contraction of the elastic member. .. <3>
The absorbent article according to <1> or <2>, wherein the elastic member is arranged so as to exhibit elasticity along the first direction.
<4>
The absorbent article according to any one of <1> to <3>, wherein the elongation stress of the elastic member is 8 cN / 10 mm or more and 50 cN / 10 mm or less, preferably 10 cN / 10 mm or more and 40 cN / 10 mm or less.
<5>
The absorbent article according to any one of <1> to <4>, wherein the concave portion has a low basis weight portion in which the basis weight of the fiber material is smaller than that of the convex portion.
<6>
The convex portion has an inwardly bent portion that is deformed so that a portion sandwiched between the concave portions in the second direction is bent toward the inside of the convex portion due to the contraction of the elastic member.
The absorbent article according to <5>, wherein the inner bent portion is located on the skin facing surface side with respect to the low basis weight portion.
<7>
The absorbent article according to <5> or <6>, wherein the elastic member is located on the non-skin facing surface side with respect to the low basis weight portion.
<8>
The basis weight of the fiber material in the low basis weight portion is 10% or less, preferably 20% or less, with respect to the basis weight of the fiber material in the convex portion where the length in the first direction is longer than the length in the second direction. The absorbent article according to any one of <5> to <7>.
<9>
The absorbent article according to any one of <5> to <8>, wherein the fiber material has a basis weight of 30 g / m ² or less, preferably 20 g / m ^{2 or less in the low basis weight portion.}
<10>
The absorbent article according to any one of <5> to <7>, wherein the low basis weight portion comprises an opening penetrating the skin contact sheet.

<11>
In the uneven region, a plurality of rows of low basis weight portions in which a plurality of the low basis weight portions are arranged along a second direction are intermittently formed in a plurality of rows in the first direction. > The absorbent article according to any one of 1.
<12>
The absorbent article according to <11>, wherein a plurality of rows of the low basis weight portions are formed at equal intervals in the first direction.
<13>
When the length of the convex portion in the second direction is L2 and the length of the low basis weight portion in the second direction is L5, L5 / L2, which is the ratio of L5 to L2, is 0.3 or more, preferably 0.3 or more. The absorbent article according to any one of <5> to <12>, which is 0.3 or more and 0.8 or less, more preferably 0.4 or more and 0.7 or less.
<14>
When the length of the convex portion in the second direction is L2 and the length of the low basis weight portion in the first direction is L6, L6 / L2, which is the ratio of L6 to L2, is 0.3 or more, preferably 0.3 or more. The absorbent article according to any one of <5> to <13>, which is 0.3 or more and 1.5 or less, more preferably 0.4 or more and 1.0 or less.
<15>
The convex portion has one or a plurality of portions sandwiched between the low basis weight portions in the second direction along the first direction.
When the length of the convex portion in the first direction is L1 and the total length of the sandwiched portions in the first direction is L10, L10 / L1 which is the ratio of L10 to L1 is 0.2 or more. The absorbent article according to any one of <1> to <14>, preferably 0.2 or more and 0.8 or less, more preferably 0.3 or more and 0.7 or less.
<16>
The absorbent article according to any one of <1> to <15>, wherein the convex portion has a portion in which the constituent fibers of the skin contact sheet are oriented along the second direction.
<17>
The absorbent article according to any one of <1> to <16>, wherein the convex portion has a portion in which the constituent fibers of the skin contact sheet are oriented along the first direction.
<18>
The absorbent article according to any one of <1> to <17>, wherein the convex portion satisfies the following formula (1) when the elastic member is extended to the maximum.
La> H1 ... (1)
La: Half of the length L1 of the convex portion in the first direction H1: Height of the convex portion <19>
The absorbent article according to <18>, wherein La / H1, which is the ratio of La to H1, is 1.5 or more and 15.0 or less, preferably 2.0 or more and 10.0 or less.
<20>
The skin contact sheet is a composite sheet in which the laminated first sheet and the second sheet are joined to each other at a plurality of joints.
The first sheet forms the convex portion protruding in the direction away from the second sheet in a portion other than the concave portion.
The absorbent article according to any one of <1> to <19>, wherein the composite sheet has a flat surface formed by the second sheet in an elongated state along the first direction.

<21>
When the length of the convex portion in the second direction is L2 and the length of the convex portion in the first direction is L1, L1 / L2, which is the ratio of L1 to L2, is 1.5 or more and 5.0 or less. The absorbent article according to any one of <1> to <20>, preferably 1.8 or more and 3.0 or less.
<22>
The elastic member can be expanded and contracted along the lateral direction, and the elastic member can be expanded and contracted.
The absorbent article according to any one of <1> to <21>, wherein the elastic member and the uneven region overlap at an end portion of the absorbent article in the vertical direction.
<23>
The elastic member can be expanded and contracted along the vertical direction, and the elastic member can be expanded and contracted.
The absorbent article according to any one of <1> to <22>, wherein the elastic member and the uneven region overlap each other at the central portion of the absorbent article in the vertical direction.
<24>
Equipped with an absorbent core containing absorbent material,
The absorbent core has a core low basis weight portion extending in the vertical direction and having a low basis weight of the absorbent material.
The absorbent article according to <23>, wherein the elastic member, the uneven region, and the core low basis weight portion overlap.
<25>
The basis weight of the core low basis weight portion is more than 0% and 80% or less, more preferably 20% or more and 60% or less, based on the basis weight of the absorbent material in the portion other than the core low basis weight portion. The absorbent article according to <24>.
<26>
Absorption basis weight of the core a low basis weight portion, 0 g / ^{m 2} Ultra 500 g / ^{m 2} or less, more preferably 40 g / ^{m 2} or more 400 g / ^{m 2} or less, according to <24> or <25> Sex goods. <27>
The absorbent article according to any one of <1> to <26>, wherein the elastic member comprises an elastic sheet in which a plurality of elastic filaments are bonded to an stretchable non-woven fabric.
<28>
The uneven region has a region that overlaps with the elastic member and a region that does not overlap with the elastic member.
Any of the above <1> to <27>, wherein the width of the convex portion in the region overlapping the elastic member in the first direction is smaller than the width of the convex portion in the region not overlapping the elastic member in the first direction. The absorbent article according to 1.

1 Disposable diapers (absorbent articles)
12 Front sheet 13 Back sheet 14 Absorber 19 Waist elastic member 10 Skin contact sheet 21 1st sheet 22 2nd sheet 31 Large concave part 32 Low basis weight part 41 Long convex part a Inwardly bent part P Central uneven area M Central area S Side area X 2nd direction Y 1st direction X ₁ Vertical direction Y ₁ Horizontal direction

Claims (13)

Absorption having an uneven region, provided with a skin contact sheet in which the uneven region abuts on the wearer's skin in the wearing state, and has a vertical direction corresponding to the front-back direction of the wearer and a horizontal direction orthogonal to the vertical direction. It ’s a sex item,
The uneven region has a first direction and a second direction orthogonal to the first direction, and a convex portion having a length longer in the first direction than the length in the second direction and a convex portion in the first direction or the second direction. It has a plurality of concave portions located between the convex portions, respectively, and has a plurality of concave portions.
The concave portion has a low basis weight portion in which the basis weight of the fiber material is smaller than that of the convex portion.
An absorbent article in which an elastic member is arranged along a first direction on the non-skin facing surface side of the skin contact sheet. In the uneven region, a plurality of rows of low basis weight portions in which a plurality of the low basis weight portions are arranged along the second direction are intermittently formed in the first direction.
The convex portion has an inwardly bent portion in which a portion sandwiched between the concave portions in a second direction is deformed so as to be folded toward the inside of the convex portion due to the contraction of the elastic member. Absorbent article described in. The absorbent article according to claim 2, wherein the inner bent portion is located on the skin facing surface side with respect to the low basis weight portion. The absorption according to claim 1, wherein in the uneven region, a plurality of rows of low basis weight portions in which a plurality of the low basis weight portions are arranged are intermittently formed in the first direction. Sex goods. The absorbent article according to any one of claims 2 to 4, wherein a plurality of rows of the low basis weight portions are formed at equal intervals in the first direction. The absorbent article according to any one of claims 1 to 5, wherein the low basis weight portion comprises an opening penetrating the skin contact sheet. The absorbent article according to any one of claims 1 to 6, wherein the convex portion has a portion in which the constituent fibers of the skin contact sheet are oriented along a second direction. The absorbent article according to any one of claims 1 to 7, wherein the convex portion has a portion in which the constituent fibers of the skin contact sheet are oriented along the first direction. The absorbent article according to any one of claims 1 to 8, wherein the convex portion satisfies the following formula (1) when the elastic member is fully extended.
La> H1 ... (1)
La: Half of the length L1 of the convex portion in the first direction H1: Height of the convex portion The skin contact sheet is a composite sheet in which the laminated first sheet and the second sheet are joined to each other at a plurality of joints.
The first sheet forms the convex portion protruding in the direction away from the second sheet in a portion other than the concave portion.
The absorbent article according to any one of claims 1 to 9, wherein the composite sheet has a flat surface formed by the second sheet in an elongated state along the first direction. The elastic member can be expanded and contracted along the lateral direction, and the elastic member can be expanded and contracted.
The absorbent article according to any one of claims 1 to 10, wherein the elastic member and the uneven region overlap at an end portion of the absorbent article in the vertical direction. The elastic member can be expanded and contracted along the vertical direction, and the elastic member can be expanded and contracted.
The absorbent article according to any one of claims 1 to 11, wherein the elastic member and the uneven region overlap each other at the central portion of the absorbent article in the vertical direction. Equipped with an absorbent core containing absorbent material,
The absorbent core has a core low basis weight portion extending in the vertical direction and having a low basis weight of the absorbent material.
The absorbent article according to claim 12, wherein the elastic member, the uneven region, and the core low basis weight portion overlap.

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