WO2018088164A1

WO2018088164A1 - Absorbent article

Info

Publication number: WO2018088164A1
Application number: PCT/JP2017/037888
Authority: WO
Inventors: 耕裕山本; 祐一廣瀬
Original assignee: 花王株式会社
Priority date: 2016-11-08
Filing date: 2017-10-19
Publication date: 2018-05-17

Abstract

This absorbent article (1) is provided with a skin-side sheet (2), a non-skin-side sheet (3), and an absorbent core (41) interposed between these sheets (2, 3). The absorbent core (41) comprises a middle region (41M) between a first region (41F) located on a front zone (A) side and a second region (41R) located on a rear zone (C) side and is provided with a thick section (42) in the middle region (41M), the thick section being thicker than the first region (41F) and the second region (41R). The thick section (42) has a maximum-width section where the lateral length of the absorbent core (41) is at a maximum. The skin-side sheet (2) includes flexible shafts (KL) that act as the origin of flexion of the skin-side sheet (2) at locations corresponding to a boundary section (BL) disposed on the periphery of the contour of the thick section (42) of the absorbent core (41).

Description

Absorbent articles

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

Conventionally, in an absorbent article such as a sanitary napkin, when there is a large amount of excreted liquid, it may lead to liquid leakage even in daily living activities. Therefore, in the absorbent core of the absorbent article, the present applicant has a method for preventing liquid leakage by providing a middle and high portion having a large basis weight in the central portion of the excretion facing area that is disposed opposite to the liquid excretion portion of the wearer. Proposed (for example, Patent Document 1).

For example, in Patent Document 1, in the absorbent core of the absorbent article, a central portion of the excretion part having a large basis weight is provided in the central part of the excretion counter area, and the excretion part middle and high region has a central wall having a long axis in the longitudinal direction. The technique which has a part and a side thick part which bulges outward from each side edge along the longitudinal direction of a center thick part was proposed. According to the absorbent article described in Patent Document 1, it is possible to improve the wearing feeling and prevent liquid leakage. Moreover, even if the mounting position is slightly shifted, the absorption performance can be expressed.

Japanese Patent Laying-Open No. 2015-97716

The present invention is a liquid-permeable skin-side sheet disposed on the skin facing surface side, a liquid-impermeable non-skin-side sheet disposed on the non-skin facing surface side, and disposed between these two sheets. An absorbent article having a longitudinally long absorbent core corresponding to a wearer's longitudinal direction and having a front area and a rear area. The absorbent core has an intermediate region between a first region located on the front region side and a second region located on the rear region side, and the intermediate region includes the first region and the second region. A thick portion having a thickness larger than the thickness in the two regions is provided. The thick portion has a maximum width portion in which the length in the lateral direction orthogonal to the longitudinal direction of the absorbent core is maximized in plan view of the absorbent core, The length in the direction is the same as the length in the transverse direction of the absorbent core. The said absorptive core has a boundary part in the position around the outline of the said thick part in this absorptive core. The skin-side sheet has a flexible shaft that causes the skin-side sheet to be bent at a position corresponding to the boundary portion in the absorbent core.

FIG. 1 is a plan view showing a skin facing surface side (skin side sheet side) of a sanitary napkin which is a preferred embodiment of the absorbent article of the present invention. FIG. 2 is a plan view of the skin facing surface side of the absorbent core of the sanitary napkin shown in FIG. 3 is a cross-sectional view schematically showing a cross section taken along line III-III in FIG. 4 is a cross-sectional view schematically showing a cross section taken along line IV-IV in FIG. FIG. 5A to FIG. 5B are explanatory views for explaining a manufacturing process of the absorbent core included in the sanitary napkin shown in FIG. 6 is a cross-sectional view of the skin-side sheet of the sanitary napkin shown in FIG. FIG. 7 is a perspective view of the skin side sheet of the sanitary napkin shown in FIG. FIG. 8 is an essential part enlarged plan view for explaining the relationship between the flexible shaft of the skin-side sheet in the sanitary napkin shown in FIG. 1 and the boundary between the middle and high portions of the absorbent core and portions other than the middle and high portions. . Fig.9 (a) is sectional drawing of the skin side sheet | seat of other embodiment which the sanitary napkin which is other preferable embodiment of the absorbent article of this invention has, FIG.9 (b) is this skin side sheet | seat. FIG. FIG. 10 is a perspective view of another embodiment of the skin side sheet of a sanitary napkin which is another preferred embodiment of the absorbent article of the present invention. FIG. 11 is a cross-sectional view corresponding to FIG. 4 of another preferred embodiment of the absorbent article of the present invention. FIG. 12 is a cross-sectional view corresponding to FIG. 3 of a sanitary napkin according to another preferred embodiment of the absorbent article of the present invention.

Detailed Description of the Invention

In the absorbent article described in Patent Document 1, if the absorbent article cannot be worn at an appropriate position on the body when worn, there may be a case where a wearing position deviation occurs in the front-rear direction and the left-right width direction of the body. In some cases, the effect of the absorbent article described in Patent Document 1 cannot be sufficiently obtained. As described above, the absorbent article described in Patent Document 1 has room for further improvement.

Therefore, it is an object of the present invention to provide an absorbent article that can eliminate the above-mentioned drawbacks of the prior art.

Hereinafter, the absorbent article of the present invention will be described with reference to the drawings based on a sanitary napkin 1 (hereinafter also referred to as “napkin 1”) which is a preferred embodiment thereof. The top view which looked at the napkin 1 of this embodiment from the skin side sheet | seat side is shown by FIG. As shown in FIG. 1, the napkin 1 according to this embodiment includes a liquid-permeable skin-side sheet 2 disposed on the skin-facing surface side and a non-liquid-permeable non-skin-side sheet disposed on the non-skin-facing surface. 3 and an absorbent core 41 having a long shape in the longitudinal direction X corresponding to the wearer's front-rear direction, which is disposed between the two

sheets

2 and 3, and has a front section A and a rear section C. As shown in FIG. 1, the napkin 1 includes an excretion facing area B disposed opposite to the wearer's liquid excretion part, and a front area A and a rear area C disposed in the longitudinal direction X of the excretion facing area B. It is divided into and.

In this specification, the vertical direction X corresponds to the longitudinal direction of the wearer, matches the longitudinal direction of the absorbent article (napkin 1), and the lateral direction Y indicates the width direction of the absorbent article (napkin 1). (Direction perpendicular to the longitudinal direction). Therefore, unless otherwise specified, in this specification, the length in the longitudinal direction (vertical direction X) means the “length” that is a distance measured in the vertical direction X, and the length in the lateral direction Y The length means “width” which is a distance measured in the lateral direction Y. The napkin 1 is formed symmetrically with respect to a center line CL extending in the vertical direction X. The vertical direction X is also a direction parallel to the center line CL. Moreover, in this specification, a skin opposing surface is a surface turned to a wearer's skin side at the time of wear of the absorptive article (napkin 1) in the absorptive article (napkin 1) or its constituent member, for example, absorber 4. The non-skin facing surface is directed to the side opposite to the skin side (clothing side) when the absorbent article (napkin 1) is worn in the absorbent article (napkin 1) or its constituent member, for example, the absorbent body 4 It is a surface that is

As shown in FIG. 1, the napkin 1 includes an excretion facing area B that is disposed opposite to a wearer's liquid excretion part (vaginal opening or the like) when worn, and the wearer's ventral side (front side) from the excretion facing area B. It has a front area A that is arranged closer to it and a rear area C that is arranged closer to the wearer's back side (rear side) than the excretion facing area B. That is, the napkin 1 is divided in the longitudinal direction X in the order of the front area A, the excretion facing area B, and the rear area C.

In the absorbent article of the present invention, the excretion facing area B is a region having one wing portion 1W in the longitudinal direction X (one wing portion) when having the wing portion 1W like the napkin 1 of the present embodiment. 1W) is a region sandwiched between a root along the vertical direction X of 1W and a root along the vertical direction X of the other wing portion 1W. Moreover, in the case of the absorbent article which does not have a wing part, when the absorbent article is folded into the three-fold individual form, two folding lines (crossing the absorbent article in the lateral direction Y ( (Not shown) means a region surrounded by a first folding line and a second folding line as counted from the front end in the longitudinal direction X of the absorbent article.

As shown in FIG. 1, the napkin 1 of the present embodiment includes a liquid-permeable skin-side sheet 2 that forms a skin-facing surface, a non-skin-side sheet 3 that forms a non-skin-facing surface, and both of these

sheets

2, 3. It has an absorber 4 interposed therebetween. The absorber 4 includes an absorbent core 41 and a core wrap sheet (not shown) that wraps the absorbent core 41. As will be described later, the absorbent core 41 has a boundary portion BL at a position around the outline of the thick portion 42 in the absorbent core 41. Here, the position around the outline of the thick part 42 means the periphery of the boundary between the thick part 42 and the part other than the thick part 42, in other words, including the outline of the thick part 42, inward and outward. Means a position where a portion having a certain width (about 6 mm inward from the contour and about 4 mm outward from the contour) extends along the contour.

In the napkin 1, the skin-side sheet 2 covers the entire area of the skin-facing surface of the absorbent body 4 and extends outward in the lateral direction Y from both side edges along the longitudinal direction X of the absorbent body 4 as shown in FIG. 1. I'm out. On the other hand, the non-skin side sheet 3 covers the entire area of the non-skin facing surface of the absorbent body 4, and further extends outward in the lateral direction Y from both side edges along the vertical direction X of the skin side sheet 2, and will be described later. A side flap portion 1 S is formed together with the side seat 5. The non-skin side sheet 3 and the side sheet 5 are joined to each other by known joining means such as an adhesive, a heat seal, and an ultrasonic seal at the extended portions from both side edges along the longitudinal direction X of the absorber 4. Yes. In addition, between the skin side sheet | seat 2 and the non-skin side sheet | seat 3, and the absorber 4 may be joined by the adhesive agent.

In the napkin 1, the side sheets 5 are arranged on both side portions along the vertical direction X on the skin facing surface of the skin side sheet 2, as shown in FIG. Preferably, the side sheet 5 is arranged over the entire length in the longitudinal direction X of the skin side sheet 2 so as to overlap both left and right side portions along the longitudinal direction X of the skin side sheet 2 in plan view.

In the napkin 1, the pair of

side sheets

5 and 5 are joined to the skin side sheet 2 at the joining portion 6 as shown in FIG. A pair of corrugated joints 6 in which irregularities in the lateral direction Y due to a curve are alternately and continuously arranged in the longitudinal direction X are arranged symmetrically in the lateral direction Y about the center line CL in plan view. In this way, when the side sheet 5 is bonded and fixed to the skin-side sheet 2 at the wavy bonding portion 6, it is inward in the lateral direction Y from the bonding portion group of the wavy bonding portions 6. A space defined by the side sheet 5 and the skin side sheet 2 is formed. Since this space portion is open toward the center line CL, body fluid such as menstrual blood flowing outward from the center in the lateral direction Y is accommodated in the space portion, and as a result, body fluid leaks. It can be effectively prevented.

In the napkin 1, as shown in FIG. 1, the side flap portion 1S projects greatly outward in the lateral direction Y in the excretion facing area B, whereby the napkin 1 has both left and right sides along the vertical direction X. In addition, a pair of

wing portions

1W and 1W are provided. The wing portion 1W is used by being folded back to the non-skin facing surface side of the crotch portion of clothes such as shorts. Moreover, as shown in FIG. 1, the skin side sheet | seat 2 and the non-skin side sheet | seat 3 are extended to the outward of the vertical direction X from the front end and the rear end of the vertical direction X of the absorber 4, respectively, and those extension parts Are joined to each other by a known joining means such as an adhesive, heat sealing, ultrasonic sealing or the like to form an end seal portion.

As shown in FIG. 1, the napkin 1 includes a linear pressing groove 7 in which the skin side sheet 2 and the absorbent core 41 are integrated. Preferably, in the napkin 1, a linear compressed groove 7 is formed on the skin-facing surface of the skin-side sheet 2 so that the skin-side sheet 2 and the absorbent body 4 are integrally recessed toward the non-skin-side sheet 3 side. ing. “Linear” in the linear compressed groove 7 means that the shape of the groove (concave portion) is not limited to a straight line in a plan view but includes a curved line. In addition, as long as the linear pressing groove 7 is extended linearly, the thickness of the bottom part of a groove | channel may be constant, and the thickness of the bottom part of a groove | channel may not be constant. Examples of the compressed groove in which the thickness of the bottom of the groove is not constant include, for example, a relatively deeply recessed portion (high pressure portion) and a relatively shallowly recessed portion (low pressure portion) at the bottom of the compressed groove. The form currently formed is mentioned. In the linear compressed groove 7, with respect to the skin-side sheet 2 and the absorbent body 4, the density of each fiber that is a constituent member is higher than the density of the peripheral portion of the linear compressed groove 7.

In the napkin 1, the linear pressing groove 7 has a pair of vertical

pressing grooves

73, 73 extending in the vertical direction X of the absorbent core 41 as shown in FIG. Preferably, in the napkin 1, the linear compressed grooves 7 are formed in the front area A and the rear area C of the absorbent body 4, respectively in the first lateral compressed groove 71 extending in the lateral direction Y, and in the excretion facing area B of the absorbent body 4. Both sides along the vertical direction X have vertical compression grooves 73 extending in the vertical direction X. In the napkin 1, the first lateral pressing groove 71 has a curved shape that protrudes outward in the longitudinal direction X, and the vertical pressing groove 73 has a curved shape that protrudes outward in the lateral direction Y in the excretion facing area B. It is. The first lateral pressing groove 71 extends in the lateral direction Y across the pair of vertical pressing grooves 73 on the inner side of the pair of vertical pressing grooves 73. In the napkin 1, the first horizontal pressing groove 71 in the front section A, one vertical pressing groove 73, the first horizontal pressing groove 71 in the rear section C, and the other vertical pressing groove 73 are connected to form a ring-shaped circumferential groove. Forming. The linear squeezing groove 7 formed in this way can suppress the diffusion of the body fluid in the planar direction of the absorbent body 4, and can effectively prevent liquid leakage from the periphery of the napkin 1.

In the napkin 1, the absorbent core 41 constituting the absorbent body 4 includes a first region 41F located on the front section A side in the longitudinal direction X and a second region 41R located on the rear section C side, as shown in FIG. And has an intermediate region 41M between the first region 41F and the second region 41R. The intermediate region 41M includes a thick portion 42 that is thicker than the thickness in the first region 41F and the rear region C. In the napkin 1, the intermediate area 41 M of the absorbent core 41 is disposed in the excretion facing area B. The napkin 1 has a thick portion 42 in the excretion facing area B.

When the pair of wing portions 1W are provided on both outer sides in the lateral direction Y as in the case of the napkin 1, the intermediate region 41M is provided between the roots of the wing portions 1W arranged at intervals in the longitudinal direction X in each wing portion 1W. Is present. More specifically, the intermediate region 41M of the napkin 1 exists between the roots of the wing portions 1W arranged at intervals in the vertical direction X of each wing portion 1W. The size of the front area A of the napkin 1 and the size of the first area 41F of the absorbent core 41 substantially coincide with each other, and the size of the rear area C of the napkin 1 and the size of the second area 41R of the absorbent core 41 are the same. Are substantially equal to each other, the length in the vertical direction X of the intermediate region 41M of the napkin 1 is between the roots of the wing parts 1W arranged at intervals in the vertical direction X in each wing part 1W. It is the same as the length.

Further, the intermediate region 41M, except for a thick boundary groove 43 described later, has an absorbent core 41 in each region of the first region 41F located in front of the intermediate region 41M and the second region 41R located behind the intermediate region 41M. The thickness is thicker than the thickness of. In the napkin 1, the absorbent core 41 has a shape that is long in the same direction as the longitudinal direction X of the napkin 1. Therefore, the longitudinal direction of the absorbent core 41 is the same as the longitudinal direction X of the napkin 1, and the lateral direction of the absorbent core 41 is the same direction as the lateral direction Y of the napkin 1.

As shown in FIG. 3, the thick portion 42 provided in the intermediate region 41 M is formed thicker than the thickness of the first region 41 F and the thickness of the second region 41 R in the absorbent core 41. Preferably, in the napkin 1, the thick portion 42 is formed to be thicker than the thickness of the first region 41F in the absorbent core 41, and more than the basis weight of the first region 41F in the absorbent core 41. The basis weight is high. Preferably, in the napkin 1, the thick portion 42 is formed thicker than the second region 41 R in the absorbent core 41 and the second region 41 R in the absorbent core 41. The basis weight is higher than the basis weight. The thickness and basis weight of each of the first region 41F and the second region 41R to be compared with the thickness and basis weight of the thick portion 42 are when a groove 45 described later is formed in the first region 41F and the second region 41R. Means the thickness and basis weight of the first region 41F and the second region 41R where there is no groove 45. The absorbent core 41 of the napkin 1 has a thickness difference by providing a difference in the basis weight of the core material. Therefore, unlike the case of providing a thickness difference by compressing a part of the absorbent core having a uniform basis weight. The absorbent core 41 is flexible as a whole. In addition, in the absorptive core 41 of this embodiment, the thick part protrudes toward the skin side sheet | seat 2, and is what is called a medium-high part which protrudes toward a wearer's skin side.

The thickness of the thick portion 42 is preferably 120% (that is, 1%) of the thickness of the first region 41F and the second region 41R in the absorbent core 41 from the viewpoint of improving the liquid absorbency of the absorbent core 41 and the like. .2 times) or more, more preferably 140% or more, and preferably 700% or less, more preferably 500% or less, and from the viewpoint of suppressing the body following ability and uncomfortable feeling when worn. , Preferably 120% or more and 700% or less, more preferably 140% or more and 500% or less. The difference in thickness between the thickness of the thick portion 42 and the thickness of the first region 41F or the second region 41R (the former-the latter) is preferably 1.0 mm or more, more preferably 2.0 mm or more. The thickness is preferably 8.0 mm or less, more preferably 6.0 mm or less, and preferably 1.0 mm or more and 8.0 mm or less, more preferably 2.0 mm or more and 6.0 mm or less. The above-described configuration is particularly effective when the thick portion 42 is provided in the excretion facing area B like the napkin 1 of the present embodiment. Moreover, when the thick part 42 is a middle-high part, the structure mentioned above is preferable also from a viewpoint of improving absorption performance because a middle-high part protrudes toward skin.
Specifically, the thickness of the thick portion 42 is preferably 2.0 mm or more, more preferably 3.0 mm or more, preferably 10.0 mm or less, more preferably 7.0 mm or less, Preferably they are 2.0 mm or more and 10.0 mm or less, More preferably, they are 3.0 mm or more and 7.0 mm or less. In addition, it is preferable that the thickness relationship is in the entire range of the thick portion 42. However, in the case where an increase or decrease is provided in the thickness direction of the thick portion 42, the above relationship is applied to the thickest portion. It only has to be.
In addition, it is preferable that the relationship of the above thickness is in the entire range of the thick portion 42, but in the thickness direction of the thick portion 42, there is a gradual increase / decrease in thickness in the horizontal direction Y or the vertical direction X or in both directions. In the case where it is provided, it is sufficient that the above relationship is satisfied in the thickest portion.
Specifically, the thickness of the first region 41F or the second region 41R is preferably 0.5 mm or more, more preferably 1.0 mm or more, and preferably 7.0 mm or less, more preferably 3.5 mm or less. Moreover, it is preferably 0.5 mm or more and 7.0 mm or less, more preferably 1.0 mm or more and 3.5 mm or less.
In the napkin 1, it is preferable that the thickness of the first region 41F or the second region 41R is substantially uniform in a portion where a groove 45 described later does not exist, but the side of the first region 41F or the second region 41R. In the case where a gradual increase / decrease in thickness is provided in the direction Y or the vertical direction X, it is only necessary that the above relationship is satisfied in the thickest portion.
The thickness of each part of the absorbent core 41 such as the thick portion 42, the first region 41F or the second region 41R, and the thick adjacent portion 44 described later is measured by the following method.

<Method for measuring thickness of each part of absorbent core 41>
The absorbent core is left in a horizontal place so as not to be wrinkled or bent, and the thick portion 42, the first region 41F, the second region 41R, or the like, which is the measurement object, is cut out from the absorbent core 41. And the thickness under the load of 5 cN / cm < ² > in the cut-out measuring object is measured. Specifically, for example, a thickness gauge PEACOCK DIAL UPRIGHT GAUGES R5-C (manufactured by OZAKI MFG.CO.LTD.) Is used for measuring the thickness. At this time, a planar or square plate (acrylic having a thickness of about 5 mm) having a size adjusted so that the load is 5 cN / cm ² between the tip of the thickness meter and the cut object to be measured. Plate) and measure the thickness. When measuring the thickness of the first region 41 F or the second region 41 R in the absorbent core 41, the thickness is measured so as not to include a groove 45 described later.

In the napkin 1, the basis weight of the thick part 42 in the absorbent core 41 is such that the thick part 42 protrudes toward the skin and improves the absorbability of the liquid in the absorbent core in the excretion facing area B. Preferably it is 100 g / m ² or more, more preferably 200 g / m ² or more, and preferably 1500 g / m ² or less, more preferably 1200 g / m ² or less, and specifically, preferably 100 g / m 2. ^{It is 2} or more and 1500 g / m ² or less, more preferably 200 g / m ² or more and 1200 g / m ² or less. The basis weight of the first region 41F or the second region 41R in the absorbent core 41 is preferably 50 g / m ² or more, more preferably 100 g / m ² or more, and preferably 1000 g / m. ² or less, more preferably 900 g / m ² or less, specifically preferably 50 g / m ² or more and 1000 g / m ² or less, more preferably 100 g / m ² or more and 900 g / m ² or less. The basis weight of the first region 41F or the basis weight of the second region 41R is the mass of the sample of the first region 41F or the second region 41R cut out as described in the method for measuring the thickness of each part of the absorbent core 41 described above. Is divided by the area of the surface of the sample facing the skin. When measuring the basic weight of the first region 41F or the basic weight of the second region 41R in the absorbent core 41, the measurement is performed so as not to include a groove 45 described later.

The thick portion 42 has a maximum width portion in which the length in the lateral direction Y orthogonal to the longitudinal direction X of the absorbent core 41 is maximized in plan view of the absorbent core 41 as shown in FIG. The length of the maximum width portion in the horizontal direction Y is the same as the length of the absorbent core 41 in the horizontal direction Y. Preferably, as shown in FIG. 2, the thick portion 42 has a longitudinal direction in accordance with both side edges along the longitudinal direction X of the absorbent core 41 when the absorbent core 41 is viewed in plan. X has a thick central portion 421 formed to extend to a predetermined length. In other words, the thickness center portion 421 extends in a strip shape between both side edges 41 s and 41 s along the longitudinal direction X of the absorbent core 41, and the entire length in the longitudinal direction X in the strip thickness center portion 421. The thickest part 42 has the maximum width part. The length in the lateral direction Y of the maximum width portion of the thickness central portion 421 is the same as the width of the absorbent core 41. Here, the width of the absorbent core 41 means the width of the absorbent core 41 including the thick portion 42. That is, taking the thick part 42 as the middle and high part as shown in FIG. 2, for example, when the thick part 42 is viewed in a cross-section in the lateral direction Y, the skin contact of the adjacent first region 41F and second region 41R The width (skin-side width) of the thick portion 42 located on the skin contact surface side is higher than the width (non-skin) of the thick portion 42 located on the non-skin contact surface side than the height position of the surface side surface. The maximum width of the thick part 42 is the same as the width of the absorbent core 41. As for the maximum width part of the thick part 42, it is desirable that the width on the skin side and the width on the non-skin side are substantially the same, and it is particularly desirable that the maximum width part is substantially uniform in the thickness direction. In the absorbent core 41, it is preferable to make the area of the wall thickness central portion 421 as wide as possible so that sufficient absorbent performance can be exhibited even when the absorbent article is worn with the absorbent article slightly shifted. From this point of view, it is preferable that the wall thickness central portion 421 has a constant interval between the side edges 41s and 41s along the longitudinal direction X of the absorbent core 41 in the maximum width portion. Are more preferably parallel to the vertical direction X and linear. However, the thickness of the thick portion 42 in the absorbent core 41 at the time of manufacturing is shifted in the lateral direction Y, the chipped portion of the thick portion 42, the die tilt due to the production method, the rounding or chamfering of the end portion, etc. If the width of the thick portion 42 and the width of the absorbent core 41 are somewhat different, for example, within the range of a difference of about 5% of the width of the maximum width portion, the same width is used. The maximum width means the distance at the longest position in the lateral direction Y. In FIG. 2, the length in the lateral direction Y at the maximum width portion in the lateral direction Y of the thick portion 42 is the same as the maximum length in the lateral direction Y in the intermediate region 41 M of the absorbent core 41. This is the same as the maximum length in the lateral direction Y of the conductive core 41.

In the napkin 1, the thick portion 42 extends over the entire length in the lateral direction Y orthogonal to the longitudinal direction X of the absorbent core 41 and extends along the longitudinal direction X of the absorbent core 41 as shown in FIG. 2. It has a wall thickness central portion 421 extending to a predetermined length in the vertical direction X along both

side edges

41s, 41s. The thick portion 42 is a front convex portion whose length in the lateral direction Y is narrower than the maximum width portion of the thick portion 42 from the thick central portion 421 toward the front section A side or the rear section C side. 422 or the rear side convex part 423 is preferable, and in the napkin 1, one front side convex part 422 which is convex toward the 1st area | region 41F side from the front-end part of the vertical direction X of the thickness center part 421. , And one rear-side convex portion 423 that is convex from the rear end portion in the longitudinal direction X of the thick central portion 421 toward the second region 41R side. That is, in the napkin 1, the thick part 42 is divided into a front convex part 422, a thick central part 421, and a rear convex part 423. In the napkin 1, the thickness center portion 421 of the thickness portion 42 extends in a strip shape between both

side edges

41s, 41s along the longitudinal direction X of the absorbent core 41, as shown in FIG. It is arranged in the excretion facing area B.

As shown in FIG. 4, the thickness center portion 421 of the thickness portion 42 is thinner in thickness from the center portion in the lateral direction Y toward the side edges along the longitudinal direction X as shown in FIG. 4. (In this embodiment, the height is reduced). That is, the central portion arranged on the center line CL extending in the vertical direction X in the thick central portion 421 is formed to have the largest thickness (in the present embodiment, the highest height is formed). Thus, when the thickness center part 421 is formed, the liquid absorptivity etc. in the excretion facing area B can be improved.

In the napkin 1, the thickness center portion 421 of the thickness portion 42 has a basis weight from the center portion in the lateral direction Y toward both side edges along the longitudinal direction X as shown in FIG. 4. It is formed to be smaller. That is, the center portion arranged on the center line CL extending in the vertical direction X in the thick central portion 421 is formed with the largest basis weight. Thus, when the thickness center part 421 is formed, the liquid absorptivity etc. in the excretion facing area B can be improved.

The wall thickness central portion 421 of the napkin 1 is a side edge having the smallest thickness (height) of the thickness (height T1) of the central portion arranged on the center line CL in a cross-sectional view as shown in FIG. The ratio (T1 / T2) to the thickness (height T2) at 41 s is 1.1 or more, particularly 1.3 or more, from the viewpoint that the thick part 42 can be closely adhered to the excretion part as much as possible. From the viewpoint of making it difficult to give an uncomfortable feeling when worn, it is preferably 4 or less, particularly 3 or less, and specifically 1.1 or more and 4 or less, particularly 1.3 or more and 3 or less. preferable.
Moreover, the thickness center part 421 of the napkin 1 is a basis of the 1st area | region 41F and the 2nd area | region 41R in the absorptive core 41 at least on the skin contact surface side from a viewpoint which does not produce an unexpected wrinkle and bend | fold in the napkin 1. It has the form which does not have a recessed part whose basic weight is lower than the quantity. Here, the basis weight of the first region 41F and the second region 41R means the basis weight of the portion excluding the groove portion 45 when the first region 41F and the second region 41R have the groove portion 45.

Moreover, in the napkin 1, as shown in FIG. 2, the front side convex part 422 convex toward the first region 41F side is arranged at the front end part of the thick central part 421. In the napkin 1, the front side convex portion 422 is arranged on the center line CL in which the top portion 422t of the front side convex portion 422 extends in the vertical direction X, and both

sides

422s and 422s forming the front side convex portion 422 are provided. Each extends linearly from the top 422t to the side edge 41s along the longitudinal direction X of the absorbent core 41. Therefore, in the napkin 1, the boundary portion BL arranged at the position around the contour of the thick portion 42 extends in a straight line shape on the first region 41F side of the intermediate region 41M, and a front thick boundary groove portion described later. 43a also extends linearly. In the napkin 1, the boundary portion BL includes a front thickness boundary groove portion 43a.

Moreover, in the napkin 1, as shown in FIG. 2, the back side convex part 423 convex toward the 2nd area | region 41R side is distribute | arranged by one at the rear-end part of the thickness center part 421. As shown in FIG. In the napkin 1, the rear-side convex portion 423 is arranged on the center line CL in which the top portion 423t of the rear-side convex portion 423 extends in the vertical direction X, similarly to the front-side convex portion 422. Both side sides 423s and 423s to be formed extend in a straight line shape from the top portion 423t to the side edge 41s along the longitudinal direction X of the absorbent core 41. Therefore, in the napkin 1, on the second region 41R side of the intermediate region 41M, the thick portion 42 and the boundary portion BL arranged at a position around the outline of the thick portion 42 extend in a straight line, which will be described later. The rear thickness boundary groove 43c also extends linearly. In the napkin 1, the boundary part BL includes a rear thick boundary groove part 43c.

As shown in FIG. 1, the napkin 1 is provided with a pair of

wing portions

1W and 1W on both outer sides in the lateral direction Y. In the napkin 1, the front imaginary line ILa that connects the roots located on the front section A side in the pair of

wing portions

1W and 1W extends along both

sides

422s and 422s that form the front convex portion 422. Crosses the part BL. In addition, the rear imaginary line ILc that connects the roots located on the rear section C side in the pair of

wing portions

1W and 1W intersects with the boundary portion BL that extends along both

sides

423s and 423s forming the rear convex portion 423. is doing. In other words, in the napkin 1, two folding lines (not shown) that cross the napkin 1 in the lateral direction Y that are generated when the napkin 1 is folded into a three-fold individual form are shown in the vertical direction X of the napkin 1. The first first folding line counted from the front end is arranged at a position intersecting with the boundary portion BL extending along the both

sides

422 s and 422 s forming the front convex portion 422. In addition, the second second folding line as counted from the front end in the longitudinal direction X of the napkin 1 is arranged at a position intersecting with the boundary portion BL extending along the both

side sides

423 s and 423 s forming the rear side convex portion 423. . By arranging a folding line generated when the napkin 1 is folded into the individual form at such a position, the flow of the body fluid flowing toward the lateral Y side end is transmitted along the boundary portion BL extending in a straight line shape. Can be prevented. In the napkin 1, the first folding line is arranged at a position intersecting the boundary part BL of the front convex part 422, and the second folding line is arranged at a position intersecting the boundary part BL of the rear convex part 423. However, it is preferable that at least one of the first folding curve and the second folding curve is arranged at such a position.

1, the napkin 1 includes a linear pressing groove 7, and the linear pressing groove 7 has a pair of vertical

pressing grooves

73 and 73 extending in the vertical direction X. And a pair of vertical

pressing grooves

73 and 73 are along the

side part

422s and 423s which form the boundary part BL extended along the both

sides

422s and 422s which form the front side convex part 422, and the back side convex part 423. It is arranged at a position intersecting with the extending boundary BL. By arranging the pair of vertical squeezing

grooves

73 and 73 at such a position, it is possible to prevent the flow of body fluid flowing toward the lateral Y side end along the boundary portion BL extending in a linear shape. In the napkin 1, the pair of vertical

pressing grooves

73, 73 are arranged at positions intersecting the boundary portion BL of the front convex portion 422 and the boundary portion BL of the rear convex portion 423, but the other linear pressing grooves 7 are arranged. Alternatively, it is preferably disposed at a position that intersects at least one of the boundary part BL of the front convex part 422 and the boundary part BL of the rear convex part 423.

In the napkin 1, as shown in FIG. 2, when the absorbent core 41 is viewed in plan, the front-side convex portion 422 gradually decreases in length in the lateral direction Y from the thick central portion 421 toward the first region 41 F. The rear-side convex portion 423 is gradually narrowed in the lateral direction Y from the thick central portion 421 toward the second region 41R side. That is, the front-side convex portion 422 and the rear-side convex portion 423 in the absorbent core 41 have their widths d from the both side portions along the vertical direction X toward the

top portions

422t and 423t located at the central portion in the horizontal direction Y, respectively. Is formed so as to gradually decrease. Preferably, in the front convex part 422 in the absorbent core 41 of the napkin 1, the distance (width d) between the side edges 422s and 422s is from the side edges 41s and 41s along the longitudinal direction X of the absorbent core 41 to the top part 422t. It is gradually decreasing. Similarly, in the rear side convex portion 423 of the absorbent core 41 of the napkin 1, the distance (width d) between the side sides 423s and 423s is from the side edges 41s and 41s along the longitudinal direction X of the absorbent core 41 to the top portion 423t. It is gradually decreasing. Here, the width d gradually decreasing means that the width d continuously decreases little by little toward the

top portions

422t and 423t.

The absorbent core 41 in the napkin 1 will be described by taking the front convex portion 422 of the front convex portion 422 and the rear convex portion 423 as an example. Both side sides 422s and 422s extend straight without bending. ing. The angle α formed by the one side 422s and the center line CL extending in the vertical direction X is preferably 20 ° or more, more preferably 30 from the viewpoint of improving fit to the body shape and followability in movement. And more preferably 75 ° or less, more preferably 60 ° or less, and specifically preferably 20 ° or more and 75 ° or less, and more preferably 30 ° or more and 60 ° or less. The rear side convex portion 423 is the same as the front side convex portion 422. *

The total length L2 in the vertical direction X of the thick portion 42 is preferably 25% or more, more preferably 30% or more, and preferably 90% or less, more than the total length L1 of the absorbent core 41 in the vertical direction X. Preferably, it is 75% or less, preferably 25% or more and 90% or less, more preferably 30% or more and 75% or less.
The full length L1 indicates the distance at the longest position in the vertical direction X of the absorbent core 41, and the full length L2 indicates the distance at the longest position in the vertical direction X of the thick portion 42.

The total length L3 in the vertical direction X of the thick central portion 421 constituting the thick portion 42 is preferably 20% or more, more preferably 30% or more, and preferably 80% of the total length L2 of the thick portion 42. In the following, it is more preferably 70% or less, preferably 20% or more and 80% or less, more preferably 30% or more and 70% or less.

The total length L4 in the vertical direction X of the front convex portion 422 constituting the thick portion 42 is preferably 5% or more, more preferably 10% or more, and preferably 50% of the total length L2 of the thick portion 42. % Or less, more preferably 30% or less, and preferably 5% or more and 50% or less, more preferably 10% or more and 30% or less. The total length X in the vertical direction X of the rear convex portion 423 constituting the thick portion 42 is also the same as the total length L4 in the vertical direction X of the front convex portion 422.
The full length L4 means the distance at the longest position in the longitudinal direction X of the front convex portion 422.

In the napkin 1, as shown in FIG. 2, the absorptive core 41 has a boundary portion BL arranged at a position around the outline of the thick portion 42, and the boundary portion BL is thick in the intermediate region 41M. It has a thick boundary groove 43 that defines the boundary between the portion 42 and a portion other than the thick portion 42. In the napkin 1, the thickness boundary groove portion 43 includes a front thickness boundary groove portion 43 a that extends along both

sides

422 s and 422 s forming the front side convex portion 422 constituting the thick portion 42, and a rear side convex portion 423. And both

sides

423 s and 423 s extending rearwardly along the boundary wall groove portion 43 c. The front thickness boundary groove 43a and the rear thickness boundary groove 43c are formed over the entire length (full width) of the absorbent core 41 in the lateral direction Y. For this reason, it is hard to produce a vertical wrinkle in the vertical direction of the napkin 1 with respect to the force acting on the inner side in the width direction of the absorbent core 41 from the legs, and the napkin 1 is easy to fit three-dimensionally along the shape of the body. Become. Thus, in the absorptive core 41, the boundary with the thick part 42 is divided by the front thickness boundary groove part 43a and the back thickness boundary groove part 43c.

In the napkin 1, the groove width of the thick boundary groove portion 43 in the absorbent core 41 is preferably 0.1 mm or more, more preferably 0.5 mm, from the viewpoint of improving the liquid absorbency and the like in the excretion facing area B. Or more, preferably 5.0 mm or less, more preferably 3.0 mm or less, and preferably 0.1 mm or more and 5.0 mm or less, more preferably 0.5 mm or more and 3.0 mm or less. It is. In addition, the groove width of the thickness boundary groove part 43 and the thickness described later are cut in a direction orthogonal to the extending direction of the thickness boundary groove part 43 and measured from a photograph of the cut end surface.
In the napkin 1, the thickness of the thick boundary groove 43 in the absorbent core 41 is preferably 0.08 mm or more, more preferably 0.15 mm, from the viewpoint of improving the liquid absorbency and the like in the excretion facing area B. Or more, preferably 7.0 mm or less, more preferably 3.5 mm or less, and preferably 0.08 mm or more and 7.0 mm or less, more preferably 0.15 mm or more and 3.5 mm or less. It is.

In the napkin 1, the thickness boundary groove 43 is lower than the basis weight of the thickness portion 42, and further, the basis weight is lower than the basis weight of the first region 41F and the basis weight of the second region 41R in the absorbent core 41. Is formed. Here, the basis weight of the first region 41 F and the basis weight of the second region 41 R mean the basis weight of the portion excluding the groove portion 45 when having the groove portion 45. The basis weight of the thickness boundary groove 43 is preferably 10 g / m ² or more, more preferably 20 g / m ² or more, and preferably 350 g / m ² or less, more preferably 250 g / m ² or less, Specifically, it is preferably 10 g / m ² or more and 350 g / m ² or less, more preferably 20 g / m ² or more and 250 g / m ² or less. In addition, the basic weight of the thickness boundary groove part 43 is the skin facing of the sample of the sample of the thickness boundary groove part 43 cut out as described in the method for measuring the thickness of each part of the absorbent core 41 described above. Divide by the area of the surface side surface.

In the napkin 1, as shown in FIG. 2, the absorbent core 41 has a thick adjacent portion 44 in a region excluding the thick portion 42 in the intermediate region 41M and further excluding the thick boundary groove portion 43. Yes. That is, in the napkin 1, the intermediate region 41 M in the absorbent core 41 includes the thick portion 42, the thick boundary groove portion 43, and the thick adjacent portion 44. The boundary portion BL is disposed at a position around the outline of the thick portion 42 and includes a part of the thick adjacent portion 44. The thick adjacent portion 44 constitutes the thick portion 42 and the front thick adjacent portion 44a disposed on the first region 41F side adjacent to the front convex portion 422 constituting the thick portion 42 in the intermediate region 41M. And a rear thick adjacent portion 44c disposed on the second region 41R side adjacent to the rear convex portion 423. The front thickness adjacent portion 44a is formed symmetrically with respect to the center line CL extending in the vertical direction X. In the front thickness adjacent portion 44a, a half portion on the side edge 41s side along the longitudinal direction X of the absorbent core 41 with respect to the center line CL has a length in the longitudinal direction X from the one side edge 41s. It is formed so as to gradually decrease toward the center line CL. The rear thickness adjacent portion 44c is also formed symmetrically with respect to the center line CL extending in the vertical direction X, similarly to the front thickness adjacent portion 44a. In the rear thickness adjacent portion 44c, a half portion on the side edge 41s side along the longitudinal direction X of the absorbent core 41 with respect to the center line CL has a length in the longitudinal direction X from the one side edge 41s. It is formed so as to gradually decrease toward the center line CL.

In the napkin 1, as shown in FIG. 3, the thickness adjacent portion 44 is formed so that the thickness is larger than the thickness of the thickness boundary groove portion 43 and smaller than the thickness of the thick portion 42 in the absorbent core 41. Has been. Furthermore, from the viewpoint of followability to the movement of the body, it is preferable that the thickness adjacent portion 44 has the same thickness as or smaller than the thickness of the first region 41F and the thickness of the second region 41R. In addition, from the viewpoint of the strength of the absorbent core 41 when repeatedly deformed with respect to body movement, the thickness of the thickness adjacent portion 44 is larger than the thickness of the first region 41F and the thickness of the second region 41R. It may be.
The thickness of the thickness adjacent portion 44 is preferably 0.5 mm or more, more preferably 1.0 mm or more, preferably 10.0 mm or less, more preferably 7.0 mm or less, and preferably 0. 0.5 mm or more and 10.0 mm or less, more preferably 1.0 mm or more and 7.0 mm or less.
The thickness of the thickness adjacent portion 44 is measured based on the method for measuring the thickness of each portion of the absorbent core 41 described above.

In the napkin 1, the thickness adjacent portion 44 is formed such that the basis weight thereof is smaller than the basis weight of the thickness portion 42 of the absorbent core 41 and larger than the basis weight of the thickness boundary groove portion 43. Furthermore, from the viewpoint of followability to the movement of the body, the thickness adjacent portion 44 has the same basis weight as the basis weight of the first region 41F and the second region 41R in the absorbent core 41. It is preferable that it is small. In addition, from the viewpoint of the strength of the absorbent core 41 when it is repeatedly deformed with respect to body movement, the thickness adjacent portion 44 has a basis weight of the first region 41F and a basis weight of the second region 41R. May be larger. Here, the basis weight of the first region 41 F and the basis weight of the second region 41 R mean the basis weight of the portion excluding the groove portion 45 when having the groove portion 45. The basis weight of the thickness adjacent portion 44 is preferably 20 g / m ² or more, more preferably 50 g / m ² or more, and preferably 800 g / m ² or less, more preferably 700 g / m ² or less. Specifically, it is preferably 20 g / m ² or more and 800 g / m ² or less, more preferably 50 g / m ² or more and 700 g / m ² or less. In addition, the basic weight of the thickness adjacent part 44 is the skin facing surface side of the sample of the sample of the thickness adjacent part 44 cut out as described in the method for measuring the thickness of each part of the absorbent core 41 described above. Divide by the area of the surface.

In the napkin 1, the first region 41F and the second region 41R in the absorbent core 41 are each formed of a groove portion 45 having a relatively small basis weight and a small absorbent portion 46 having a relatively large basis weight, as shown in FIG. And have. Preferably, the groove part 45 has a vertical groove 45X extending in the vertical direction X and a horizontal groove 45Y extending in the horizontal direction Y. The vertical grooves 45X extending in the vertical direction X are arranged with a constant interval in the horizontal direction Y, and the horizontal grooves 45Y extending in the horizontal direction Y are arranged with a constant interval in the vertical direction X. The small absorption part 46 is arranged at the position of the grid defined by the vertical groove 45X and the horizontal groove 45Y.

In the napkin 1, the thickness and basis weight of the first region 41F and the second region 41R described above mean the thickness and basis weight of the small absorbent portion 46. The basis weight of the forming material of the absorbent core 41 constituting the bottom of the vertical groove 45X is such that the napkin 1 can be fit three-dimensionally along the shape of the body from the viewpoint of the first region 41F and the absorbent core 41. The basis weight of the second region 41R is preferably lower. Moreover, the basic weight of the forming material of the absorptive core 41 which comprises the bottom part of the horizontal groove 45Y extended in the horizontal direction Y is the absorptive core 41 from a viewpoint which the napkin 1 becomes easy to fit three-dimensionally along a body shape. The basis weight of the first region 41F and the second region 41R is preferably lower. From the viewpoint that the napkin 1 can be more easily fitted along the shape of the body, the basis weight of the longitudinal grooves 45X and the basis weight of the lateral grooves 45Y are lower than the basis weights of the first region 41F and the second region 41R in the absorbent core 41. It is preferable.

In the napkin 1, the absorbent core having the groove portion 45 and the small absorbing portion 46 in the first region 41F and the second region 41R, and the thick portion 42, the thick boundary groove portion 43, and the thick adjacent portion 44 in the intermediate region 41M. The whole 41 is integrally molded. “Integrally molded” means that the same material is used to form parts in one process, unlike the case where members manufactured in different processes are joined by means of bonding, such as adhesives or compression. Means that

The absorbent core 41 of the napkin 1 described above includes, for example, a stacking drum 54 that includes an accumulation recess 55 on the outer peripheral surface and rotates in one direction R, as shown in FIG. 5A, and the stacking drum 54. It can manufacture using the fiber pile apparatus provided with the duct (not shown) which supplies a core material in a scattering state to the outer peripheral surface.
A plurality of stacking recesses 55 are formed at regular intervals in the circumferential direction of the outer peripheral surface of the stacking drum 54. The bottom surface 56 of the accumulation recess 55 is made of a mesh plate or the like and has a large number of pores functioning as suction holes.

Further, as shown in FIG. 5A, one concave portion 56 b for forming the intermediate region 41 M of the absorbent core 41 is formed in a part of the bottom surface 56 of the single concave portion 55 for accumulation. . Moreover, the 1st impermeable member 57 for forming the thickness boundary groove part 43 which divides the thick part 42 and the thick adjacent part 44 is arrange | positioned in the bottom face in the recessed part 56b. The first breathable member 57 is disposed at a position corresponding to the thick boundary groove 43 and is fixed so as to protrude from the bottom surface of the recess 56b. In addition, a second breathable member 58 for forming the groove 45 is disposed on the bottom surface 56 of the upstream region and the downstream region in the rotation direction R adjacent to the recess 56b. The second breathable member 58 is disposed at a position corresponding to the vertical groove 45X and the horizontal groove 45Y, and is fixed so as to protrude from the bottom surface 56 of the accumulation recess 55. The first breathable member 57 and the second breathable member 58 may be non-breathable members, and are made of, for example, metal, plastic, ceramic, or the like.

Similarly to the known fiber pile device provided with the fiber pile drum, the core material mixed with the water-absorbing polymer and the pulp fiber is supplied into the duct while sucking from the bottom surface of the accumulation concave portion 55, so that FIG. As shown in (b), the core material is deposited in a predetermined shape in the recesses 55 for accumulation. The precursor of the absorbent core 41 is obtained by releasing the deposit 40 from the accumulation recess 55. The precursor of the absorbent core 41 is covered with a core wrap sheet (not shown), then cut with a rotary cutter or the like, and conveyed in a conveying direction by a conveying means such as a belt conveyor. Thus, the absorptive core 41 is obtained. The absorbent core 41 covered with the core wrap sheet (not shown) obtained in this manner is compressed in an appropriate manner by pressurizing the whole or a part, for example, by passing it between a pair of rolls once or a plurality of times. . Thereby, the part accumulated in the recessed part 56b turns into the thick part 42 with both relatively large basic weight and thickness. Similarly, the portion made of the core material deposited in the upstream region and the downstream region adjacent to the recess 56b becomes the first region 41F and the second region 41R in the absorbent core 41 having a relatively small basis weight. In addition, the portion of the concave portion 56b made of the core material deposited on the first air-permeable member 57 is relatively thicker than the basis weight of the first region 41F and the basis weight of the second region 41R. Become. The portion made of the core material deposited on the second non-breathable member 58 in the upstream region and the downstream region adjacent to the recess 56 b becomes the groove portion 45 that is relatively smaller than the basis weight of the small absorbent portion 46.

The liquid-permeable skin-side sheet 2 that forms the skin-facing surface is a flexible axis KL that causes the skin-side sheet 2 to be bent at a position corresponding to the boundary portion BL of the thick portion 42 in the absorbent core 41. have. The flexible axis KL is a portion where the skin side sheet 2 is easily bent, and for example, the flexibility in the skin side sheet 2 is formed higher than the adjacent portion. Since the skin-side sheet 2 is easily bent with the flexible axis KL, the skin-side sheet 2 has a gap with the absorbent core 41 at a position corresponding to the boundary portion BL in the absorbent core 41. The liquid flow which flows on the surface of a skin side sheet | seat becomes difficult, and sufficient absorption performance can be expressed. The skin side sheet 2 is formed of a nonwoven fabric.

In the napkin 1, the skin side sheet 2 is partially formed by laminating a first layer 21 forming a skin facing surface and a second layer 22 arranged on the absorber 4 side, as shown in FIGS. It is the nonwoven fabric joined to. The first layer 21 includes a fiber that does not substantially heat shrink or a fiber that does not substantially heat shrink at the shrinkage start temperature of the heat shrinkable fiber. The second layer 22 includes heat-shrinkable fibers. In the napkin 1, the skin-side sheet 2 was obtained by laminating the first layer 21 and the second layer 22 and partially joining them, and then shrinking the heat-shrinkable fibers of the second layer 22 by hot air treatment. It is a sheet having an uneven structure. In the sheet of this concavo-convex structure, the first layer 21 protrudes toward the wearer's skin side at a portion other than the sheet joining portion 23 with the second layer 22, while forming the skin side protruding portion 24, The sheet bonding portion 23 forms a recess. The sheet having the concavo-convex structure formed in this way is solid because the inside of the skin-side protruding portion 24 is filled with the constituent fibers. And between the skin

side protrusion parts

24 and 24 is a recessed part (sheet | seat junction part 23). The heat-shrinkable fiber of the second layer 22 constituting the uneven structure sheet is preferably a latent crimpable fiber. Sheets having such a concavo-convex structure are disclosed in JP 2002-187228 A, JP 2003-250836 A, JP 2004-166849 A, JP 2004-202890 A, JP 2009-153734 A, and the like. It can be produced by the method described.

The latent crimpable fibers are those that develop coiled crimps by heat treatment, for example, an eccentric core-sheath type composite fiber or side-by-side composite containing two types of thermoplastic polymer materials having different shrinkage rates. -Made of side type composite fiber. Examples thereof include those described in JP-A-9-296325 and Japanese Patent No. 2759331. As the fibers that do not undergo thermal contraction of the first layer 21 constituting the uneven structure sheet, fibers made of a thermoplastic polymer material are suitably used. Examples of the thermoplastic polymer material include polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate, and polyamides. A core-sheath type or side-by-side type composite fiber made of a combination of these thermoplastic polymer materials can also be used.

In the skin side sheet 2 shown in FIG. 6 and FIG. 7, the partial joining of the laminate of the first layer 21 and the second layer 22 is formed by, for example, heat embossing or ultrasonic embossing. Therefore, in the sheet joining portion 23 that forms the recess, the constituent fibers of the nonwoven fabric are compressed, and the density of the constituent fibers is higher than the density around the sheet joining portion 23. In addition, the fiber density of the concave portion (sheet joining portion 23) is higher than the fiber density of the top portion of the skin-side protruding portion 24. Moreover, the thickness of the nonwoven fabric is thin in the concave portion (sheet joining portion 23).

Moreover, in the skin side sheet | seat 2 shown in FIG.6 and FIG.7, the fiber density of the 2nd layer 22 distribute | arranged to the absorber 4 side becomes higher than the fiber density of the 1st layer 21 which forms a skin opposing surface. ing. The fiber density of the second layer 22 is preferably 0.03 g / cm ³ or more and 0.2 g / cm ³ or less, more preferably 0.04 g / cm ³ or more and 0.1 g / cm ³ or less. Fiber density of the first layer 21 is preferably 0.001 g / cm ³ or more 0.05 g / cm ³ or less, more preferably 0.01 g / cm ³ or more 0.03 g / cm ³ or less. The fiber density of the first layer 21 and the second layer 22 can be measured by the fiber density measuring method described in JP-A-2003-250836.

Moreover, in the skin side sheet | seat 2 shown in FIG.6 and FIG.7, the sheet | seat junction part 23 of the 1st layer 21 and the 2nd layer 22 is distributedly arranged by the predetermined pattern, and the skin side protrusion part 24 is the skin. The side sheet 2 is arranged in the form of dots in plan view. The interval between adjacent sheet joining portions 23 is preferably 2 mm or more and 20 mm or less, more preferably 3 mm or more and 15 mm or less.

Further, in the skin-side sheet 2 shown in FIG. 7, the flexible shaft KL extends on the imaginary line connecting the adjacent sheet

joint portions

23, 23 in the plurality of sheet joint portions 23 arranged in a distributed manner. In this way, since the flexible shaft KL extends by connecting the adjacent sheet

joint portions

23, 23, in the skin side sheet 2 shown in FIG. It extends on the imaginary line that connects the thinner parts (sheet joining part 23). In addition, the flexible axis KL extends on an imaginary line that connects portions (sheet bonding portion 23) where the density of the constituent fibers of the nonwoven fabric is higher than the density around the sheet bonding portion 23. A plurality of flexible shafts KL are formed when the napkin 1 is viewed in plan as shown in FIG. In the napkin 1, as shown in FIG. 8, the flexible axis KL has an angle α1 extending from the right side of the front section A to the left side of the rear section C and forming the center line CL with respect to the center line CL extending in the longitudinal direction X. And a plurality of second flexible shafts KL2 extending from the left side of the front section A to the right side of the rear section C and intersecting at an angle α2 formed with the center line CL. Yes.

The angle α1 formed by the first flexible axis KL1 and the center line CL is preferably 20 degrees or more, more preferably 25 degrees or more, and preferably 70 degrees or less, more preferably 60 degrees or less. Specifically, it is preferably 20 degrees or more and 70 degrees or less, more preferably 25 degrees or more and 60 degrees or less.
In the napkin 1, a plurality of first flexible shafts KL1 are arranged at equal intervals, and the interval between the adjacent first flexible shafts KL1 and KL1 is preferably 3 mm or more, more preferably 4 mm or more. And it is preferably 15 mm or less, more preferably 12 mm or less, specifically, preferably 3 mm or more and 15 mm or less, more preferably 4 mm or more and 12 mm or less.

The angle α2 formed by the second flexible axis KL2 and the center line CL is preferably 20 degrees or more, more preferably 25 degrees or more, and preferably 70 degrees or less, more preferably 60 degrees or less. Specifically, it is preferably 20 degrees or more and 70 degrees or less, more preferably 25 degrees or more and 60 degrees or less.
In the napkin 1, a plurality of second flexible shafts KL2 are arranged at equal intervals, and the interval between the adjacent second flexible shafts KL2 and KL2 is preferably 3 mm or more, more preferably 4 mm or more. And it is preferably 15 mm or less, more preferably 12 mm or less, specifically, preferably 3 mm or more and 15 mm or less, more preferably 4 mm or more and 12 mm or less.

As described above, in the napkin 1, the skin side sheet 2 has the flexible shaft KL at a position corresponding to the boundary portion BL of the thick portion 42 in the absorbent core 41. Further, in the napkin 1, a plurality of flexible axes KL of the skin side sheet 2 are arranged in a plan view of the napkin 1. Therefore, in the napkin 1, the plurality of flexible axes KL intersect with the boundary portion BL of the absorbent core 41 in a plan view of the napkin 1 as shown in FIG. 8. In other words, in the napkin 1, the plurality of flexible axes KL intersect with both side edges 422 s and 422 s that form the front convex part 422, and intersect with both side edges 423 s and 423 s that form the rear convex part 423. ing. Further, in the napkin 1, as described above, the thick boundary groove portion 43 extends along the boundary portion BL, and the plurality of flexible shafts KL intersect with the thick boundary groove portion 43 of the absorbent core 41. Specifically, the plurality of first flexible shafts KL1 and the plurality of second flexible shafts KL2 extend along the both

sides

422s and 422s that form the front-side convex portion 422 constituting the thick portion 42. It intersects with the front thickness boundary groove 43a, and also intersects with the rear thickness boundary groove 43c extending along both

sides

423s and 423s forming the rear convex portion 423. Therefore, during wearing of the napkin 1, the skin-side sheet 2 is easily bent three-dimensionally from the plurality of flexible axes KL at the boundary portion BL of the absorbent core 41, and at the boundary portion BL of the absorbent core 41. It is difficult for a gap to be formed between the absorbent core 41 and the skin side sheet 2, the liquid flow flowing on the surface of the skin side sheet 2 can be prevented, and sufficient absorption performance can be exhibited.

The formation material of each structural member of the napkin 1 of this embodiment mentioned above is demonstrated.
The non-skin-side sheet 3 has poor liquid permeability or liquid impermeability, and is composed of a material including a thermoplastic synthetic resin. For example, a synthetic resin film, a laminate of a synthetic resin film and a nonwoven fabric, Spunbond-meltblown-spunbond laminated fiber nonwoven fabrics, air-through fiber nonwoven fabrics, point bond fiber nonwoven fabrics, spunbond fiber nonwoven fabrics and the like can be used, but are not limited thereto. Those similar to those conventionally used in the technical field can be used without particular limitation. For example, the non-skin side sheet 3 preferably has a basis weight of 10 to 50 g / m ² and a thickness of 8 to 200 μm.

The core material of the absorbent core 41 includes a fiber assembly made of a fiber material such as pulp fiber. As the fiber material, various materials conventionally used for absorbent articles of absorbent articles such as sanitary napkins, panty liners, and disposable diapers can be used without particular limitation. For example, pulp fibers, rayon fibers, cotton Short fibers of cellulosic fibers such as fibers, short fibers of synthetic fibers such as polyethylene, and the like are used. These fibers can be used alone or in combination of two or more. The fiber material is preferably entirely or partly pulp fiber, and the ratio of the pulp fiber in the fiber material is preferably 50 to 100% by mass, more preferably 80 to 100% by mass, More preferably, it is 100 mass%.
The absorbent core 41 may contain a water-absorbing polymer. Examples of water-absorbing polymers include sodium polyacrylate, (acrylic acid-vinyl alcohol) copolymer, cross-linked sodium polyacrylate, (starch-acrylic acid) graft copolymer, and (isobutylene-maleic anhydride) copolymer. Examples thereof include a polymer and a saponified product thereof, and polyaspartic acid. By containing the water-absorbing polymer, it is possible to more quickly absorb and retain a large amount of excretory fluid such as blood.
Moreover, you may mix | blend a deodorizer, an antibacterial agent, etc. with the absorptive core 41 as needed.

Examples of the core wrap sheet (not shown) for covering the absorbent core 41 include tissue paper and water permeable nonwoven fabric. The absorbent body 4 is formed by covering the upper and lower surfaces of the absorbent core 41 with a core wrap sheet (not shown). The core wrap sheet (not shown) is used for the purpose of preventing leakage of the forming material of the absorbent core 41 or improving the shape retention of the absorbent core 41. A core wrap sheet (not shown) for covering the skin facing surface side of the absorbent core 41 and the skin side sheet 2 and a core wrap sheet (not shown) for covering the non-skin facing surface side of the absorbent core 41; It is preferable that the non-skin side sheet 3 is bonded to each other by a pattern-coated adhesive such as a dot, a spiral, or a stripe.

As the side sheet 5, various types conventionally used in the technical field can be used without particular limitation, for example, a liquid-impermeable or water-repellent resin film, a laminate of a resin film and a nonwoven fabric, or the like. Can be used. As other materials, for example, a spunbond nonwoven fabric, a sheet (for example, SM, SMS, SMMS, etc.) in which a spunbond nonwoven fabric (S) and a melt blown nonwoven fabric (M) are combined, a heat roll nonwoven fabric, an air-through nonwoven fabric, etc. A water-repellent (hydrophobic) non-woven fabric may be mentioned.

The joint portion 6 that joins the side sheet 5 and the skin side sheet 2 can be formed in accordance with a conventional method by heat sealing.
The linear pressing groove 7 (the first horizontal pressing groove 71 and the vertical pressing groove 73) is formed in accordance with an ordinary method by pressing with or without heat (so-called embossing) or embossing such as ultrasonic embossing. Can do.

The effect of the napkin 1 of this embodiment mentioned above is demonstrated.
As shown in FIGS. 1 and 2, the napkin 1 has a thick portion 42 as a middle-high portion in an intermediate region 41M of the absorbent core 41, and the thick portion 42 is absorbent as shown in FIG. The core 41 has a maximum width portion in which the length in the lateral direction Y of the absorbent core 41 is maximized in plan view, and the length of the maximum width portion in the lateral direction Y is an intermediate region of the absorbent core 41 It is the same as the length in the horizontal direction Y of 41M. Therefore, even if the napkin 1 which is an absorbent article is worn in a slightly shifted state, sufficient absorption performance can be exhibited. Moreover, in the napkin 1, as shown in FIG.1 and FIG.8, the skin side sheet | seat 2 has the flexible axis | shaft KL in the position corresponding to the boundary part BL of the thick part 42 in the absorptive core 41. FIG. Therefore, while wearing the napkin 1, the skin-side sheet 2 is easily bent at the boundary BL of the absorbent core 41 with the flexible axis KL as a starting point, so that the absorbent core at the boundary BL of the absorbent core 41. It is difficult for a gap to be formed between 41 and the skin-side sheet 2, the liquid flow flowing on the surface of the skin-side sheet 2 can be prevented, and sufficient absorption performance can be exhibited. In the napkin 1, the plurality of flexible shafts KL intersect with the thick boundary groove 43 of the absorbent core 41. Therefore, the above effect can be further achieved.

Further, in the napkin 1, as shown in FIG. 2, the maximum width portion is formed by extending a predetermined length in the longitudinal direction X along both side edges along the longitudinal direction X of the absorbent core 41. Part 421. Therefore, it is possible to increase the amount of excreted fluid absorbed, and when the napkin 1 that is an absorbent article is worn in a slightly shifted state, the body movement during wearing, the body posture during sleeping, etc. However, sufficient absorption performance can be expressed. Further, as shown in FIG. 2, the thick portion 42 has a thick central portion 421 and a convex front from the front end portion in the longitudinal direction X of the thick central portion 421 toward the first region 41 F side. The side convex part 422 and the rear side convex part 423 convex from the rear end part of the vertical direction X of the thickness center part 421 toward the second region 41R side are provided. Therefore, even if the napkin 1 is worn in a slightly displaced state, the lateral direction Y of the napkin 1 from both thighs as long as the thick part 42 has the front convex part 422 and the rear convex part 423. By deforming the front-side convex portion 422 and the rear-side convex portion 423 with respect to the inward force, the thick-walled portion 42 has excellent followability to the body shape, making it difficult for the wearer to feel uncomfortable. In particular, in the napkin 1, the boundary portion BL arranged at the position of the contour edge of the thick portion 42 on the first region 41F side of the intermediate region 41M extends linearly, and the second region of the intermediate region 41M On the 41R side, the boundary portion BL arranged at a position around the outline of the thick portion 42 extends in a straight line shape. Therefore, the thick part 42 is further excellent in followability to the body shape, and it is difficult to give the wearer a sense of incongruity.

Further, as shown in FIG. 2, the napkin 1 has a thick portion 42 as a middle and high portion in the intermediate region 41M of the absorbent core 41 and a thick boundary groove portion 43 that partitions a portion other than the thick portion 42. ing. The front thickness boundary groove portion 43 a and the rear thickness boundary groove portion 43 c of the thickness boundary groove portion 43 are formed over the entire length (full width) of the absorbent core 41 in the lateral direction Y. For this reason, it is hard to produce a vertical wrinkle in the vertical direction of the napkin 1 with respect to the force acting on the inner side in the width direction of the absorbent core 41 from the legs, and the napkin 1 is easy to fit three-dimensionally along the shape of the body. Become. Further, as shown in FIG. 8, the first flexible shaft KL1 and the second flexible shaft KL2 of the flexible shaft KL are along the both

sides

422s and 422s forming the front convex portion 422 constituting the thick portion 42. The first flexible shaft KL1 and the second flexible shaft KL2 of the flexible shaft KL extend along the both

sides

423s and 423s forming the rear-side convex portion 423. It also intersects with the rear thickness boundary groove 43c that extends. Therefore, during wearing of the napkin 1, the skin-side sheet 2 is more easily bent at the boundary BL of the absorbent core 41 with the flexible axis KL as a starting point, and the absorbent core 41 and the absorbent core 41 at the boundary BL of the absorbent core 41. A gap is not easily generated between the skin side sheet 2 and the liquid flow flowing on the surface of the skin side sheet 2 can be prevented, and sufficient absorption performance can be exhibited.

Moreover, in the napkin 1, as shown in FIG.7 and 8, the flexible axis KL of the skin side sheet | seat 2 connected the part (sheet | seat junction part 23) where the thickness of a nonwoven fabric is thinner than the surrounding thickness. It extends on the imaginary line. Therefore, during wearing of the napkin 1, the skin-side sheet 2 is more easily bent at the boundary BL of the absorbent core 41 with the flexible axis KL as a starting point, and the absorbent core 41 and the absorbent core 41 at the boundary BL of the absorbent core 41. A gap is less likely to occur between the skin side sheet 2 and the skin side sheet 2. In addition, the flexible axis KL extends on an imaginary line that connects portions (sheet bonding portion 23) where the density of the constituent fibers of the nonwoven fabric is higher than the density around the sheet bonding portion 23. Therefore, the above effect can be further achieved.

Further, in the napkin 1, the fiber density of the concave portion (sheet bonding portion 23) of the skin-side sheet 2 having the uneven structure is higher than the fiber density of the top portion of the skin-side protruding portion 24. Therefore, it is easy to draw body fluid to the absorber 4 side, the liquid flow flowing through the surface of the skin side sheet 2 can be prevented, and sufficient absorption performance can be expressed. Moreover, since the inside of the skin side protrusion part 24 of the skin side sheet | seat 2 is satisfy | filled with the constituent fiber, and is solid, the said effect can be show | played further. Moreover, in the skin side sheet | seat 2 of the napkin 1, the fiber density of the 2nd layer 22 distribute | arranged to the absorber 4 side is higher than the fiber density of the 1st layer 21 which forms a skin opposing surface. Therefore, the body fluid can be easily drawn into the absorbent body 4 side, the liquid flow flowing on the surface of the skin side sheet 2 can be prevented, and sufficient absorption performance can be exhibited. Moreover, since the skin side protrusion part 24 of the skin side sheet | seat 2 of uneven structure is distribute | arranged to the dotted | punctate shape, the touch at the time of use is good and prevents the liquid flow which flows through the surface of the skin side sheet | seat 2 more effectively. it can.

From the standpoint of further achieving the above effects, the skin-side protruding portion 24 of the skin-side sheet 2 has a height h (see FIG. 6) at the top, which is the thick portion 42 and the first region 41F or the second region of the absorbent core 41. It is preferably greater than or equal to the step h2 (see FIG. 3) due to the region 41R, and more preferably larger than the step h2 (see FIG. 3). If it has such a relationship, in the boundary part BL part located in the periphery of the outline of the thick part 42 in the absorptive core 41, the skin side protrusion part 24 on the skin side sheet | seat 2 will be bent starting from the flexible axis KL. The inclined skin-side protruding portion 24 and the non-inclined skin-side protruding portion 24 are close to each other so that the liquid flow flowing on the surface of the skin-side sheet 2 can be prevented, and the body fluid is absorbed into the absorber 4 side. Sufficient absorption performance can be expressed by becoming easy to draw in. The height h of the skin-side protruding portion 24 of the skin-side sheet 2 at the top is preferably 1 mm or more and 7 mm or less, more preferably 1 mm or more and 6.5 mm or less. The step h2 between the thick portion 42 and the first region 41F or the second region 41R in the absorbent core 41 is preferably 1 mm or more and 7 mm or less, more preferably 1 mm or more and 6 mm or less. The height h of the skin side protruding portion 24 of the skin side sheet 2 is measured using a thickness measuring instrument in a state where a load of 0.05 kPa is applied to the skin side sheet 2. A laser displacement meter manufactured by OMRON Corporation is used for the thickness measuring instrument. For the measurement of the height h, the thickness is measured at 10 points, and the average value thereof is calculated as the height h. The level difference h2 can be obtained by the method for measuring the thickness of each part of the absorbent core 41 described above.

Moreover, in the napkin 1, the thick part 42 of the absorptive core 41 has the front side convex part 422 and the back side convex part 423, as shown in FIG. For this reason, while the napkin 1 is being worn, a gap is less likely to occur between the absorbent core 41 and the skin-side sheet 2 at the boundary portion BL of the absorbent core 41, and the liquid flow flowing on the surface of the skin-side sheet 2 is prevented. From the viewpoint of preventing liquid flow flowing on the surface of the skin-side sheet 2 while further improving the feeling of wearing while exhibiting sufficient absorption performance, the napkin 1 is viewed in plan, and the front-side convex portion 422 It is preferable that the skin-side protruding portion 24 of the skin-side sheet 2 having a concavo-convex structure is disposed at a position corresponding to the top portion 422t or the top portion 423t of the rear-side convex portion 423, and the top portion 422t and the rear side of the front-side convex portion 422 It is particularly preferable that the skin-side protruding portion 24 of the skin-side sheet 2 having a concavo-convex structure is disposed at a position corresponding to the top portion 423t of the convex portion 423.

Further, as shown in FIG. 2, the napkin 1 has a front thickness disposed on the first region 41 F side adjacent to the front convex portion 422 constituting the thick portion 42 in the intermediate region 41 M of the absorbent core 41. It has the adjacent part 44a and the rear thickness adjacent part 44c distribute | arranged to the 2nd area | region 41R side adjacent to the back side convex part 423 which comprises the thick part 42. FIG. And the thickness of the thickness adjacent part 44 is the magnitude | size below the thickness of the 1st area | region 41F in the absorptive core 41, and the thickness of the 2nd area | region 41R, and is formed smaller than the thickness of the thickness part 42. Yes. Therefore, even if the napkin 1 is worn in a slightly shifted state, it is difficult to form a gap with the wearer's skin, and sufficient absorption performance can be exhibited. In the napkin 1, the basis weight of the thickness adjacent portion 44 is smaller than the basis weight of the first region 41F and the second region 41R in the absorbent core 41 and larger than the basis weight of the thickness boundary groove 43. Since it is formed, the effect of reducing the uncomfortable feeling to the wearer can be further exhibited.

In particular, when the napkin 1 is worn over a long period of time, when the napkin 1 is repeatedly deformed by the movement of the body, the thickness adjacent portion 44 may be damaged to impair the absorption performance. The thickness of the thickness adjacent portion 44 may be larger than the thickness of the first region 41F and the second region 41R in the absorbent core 41.
Further, when the thickness adjacent portion 44 is damaged due to repeated body movement and damages the absorption performance, the basis weight of the thickness adjacent portion 44 is determined by the first region 41F and the absorbent core 41. The basis weight of the second region 41R may be larger.

As mentioned above, although this invention was demonstrated based on the preferable embodiment, the absorbent article of this invention is not restrict | limited to the napkin 1 of this embodiment at all, and can be changed suitably.

For example, in the skin side sheet 2 of the napkin 1, as shown in FIGS. 6 and 7, the sheet joint portions 23 of the first layer 21 and the second layer 22 are distributed and arranged in a predetermined pattern, and the skin side protrusion Although the part 24 is arranged in the form of dots when the skin side sheet 2 is viewed in a plan view, it is not limited to the form in which the skin side protruding parts 24 are arranged in the form of dots. For example, the sheet joining portion 23 between the first layer 21 and the second layer 22 is continuously extended in the longitudinal direction X, and the sheet joining portion 23 extending continuously in the longitudinal direction X is intermittently disposed in the lateral direction Y. Accordingly, after the laminated body of the first layer 21 and the second layer 22 is partially joined, the heat-shrinkable fibers of the second layer 22 may be contracted by hot air treatment. The sheet having the concavo-convex structure thus obtained becomes a sheet having a concavo-convex structure in which the skin-side protrusions 24 continuously extending in a strip shape in the longitudinal direction X, which is one direction, are intermittently arranged in the lateral direction Y. If the skin-side sheet 2 having a plurality of skin-side protrusions 24 extending continuously in the longitudinal direction X is used, the position corresponding to the boundary portion BL of the position of the contour edge of the thick portion 42 in the absorbent core 41, Skin having a plurality of flexible shafts KL extending on the sheet joining portion 23 extending in the longitudinal direction X, and continuously extending in a strip shape in the longitudinal direction X at the boundary portion BL of the absorbent core 41 during wearing of the napkin 1 Since the side protrusions 24 are in contact with each other, the liquid flow that flows on the surface of the skin-side sheet 2 can be prevented, sufficient absorption performance can be exhibited, and side leakage of body fluid can be prevented.

Further, the skin-side sheet 2 of the uneven structure of the napkin 1 shown in FIG. 6 includes a first layer 21 including fibers that are not substantially heat-shrinkable or fibers that are not substantially heat-shrinkable at the shrinkage start temperature of the heat-shrinkable fibers; A plurality of skin-side protrusions 24 and sheets obtained by laminating and partially joining the second layer 22 containing heat-shrinkable fibers and then shrinking the heat-shrinkable fibers of the second layer 22 by hot air treatment Although it is a nonwoven fabric with a concavo-convex structure having a joint 23 (concave portion), a woven fabric with a concavo-convex structure formed by another method may be used. For example, the non-woven fabric shown in FIGS. 9A and 9B may be used in which the uneven structure sheet has heat-extensible fibers. A nonwoven fabric with a concavo-convex structure with heat-extensible fibers is formed by embossing a web that contains heat-extensible fibers whose length increases by heating to form a crimped part, followed by air-through processing with hot air to stretch the heat-extensible fibers. And can be produced by joining the intersections of the heat-extensible fibers by heat fusion. In such a nonwoven fabric having a concavo-convex structure having a heat-extensible fiber, the pressure-bonding portion 23a is a concave portion, and a skin-side protruding portion 24a is formed between the adjacent pressure-

bonding portions

23a and 23a. As shown in FIGS. 9 (a) and 9 (b), the nonwoven fabric having a concavo-convex structure having heat-extensible fibers is formed by connecting the adjacent crimping portions with the flexible shaft KL. Even if it uses the skin side sheet | seat 2 of the uneven structure which has such a heat | fever extensible fiber, the effect similar to the effect mentioned above is acquired. Examples of the heat-extensible fibers include Japanese Patent No. 4131852, Japanese Patent Application Laid-Open No. 2005-350836, Japanese Patent Application Laid-Open No. 2007-303035, Japanese Patent Application Laid-Open No. 2007-204899, Japanese Patent Application Laid-Open No. 2007-204901, and Japanese Patent Application Laid-Open No. 2007-204902. The fiber described in No. gazette etc. can be used.

Moreover, as a nonwoven fabric of the uneven structure formed by the said other method used for the skin side sheet | seat 2 of the uneven structure of the napkin 1, the inside of the skin side protrusion part 24 as shown in FIG. 6 was satisfy | filled with the constituent fiber. The nonwoven fabric may not be a solid nonwoven fabric, and may be, for example, a nonwoven fabric having an uneven structure shown in FIG. The skin-side sheet 2 having an uneven structure shown in FIG. 10 has a plurality of skin-side protrusions 24b that protrude toward the wearer's skin and have an internal space, and a plurality of skin-side protrusions 24b that protrude toward the non-skin-side sheet 3 and have an internal space. It is a sheet | seat of the uneven structure which has the non-skin side protrusion part 25 of this. The skin-side sheet 2 having the concavo-convex structure shown in FIG. 10 has a configuration without a heat-sealing portion for forming the skin-side protruding portion 24b and the non-skin-side protruding portion 25 into a sheet shape. The skin-side sheet 2 having a concavo-convex structure shown in FIG. 10 has a flexible axis KL formed by connecting adjacent non-skin-

side protrusions

25 and 25. Such a skin-side sheet 2 having a concavo-convex structure shown in FIG. 10 uses, as a raw material nonwoven fabric, an air-through nonwoven fabric having a single-layer structure or a multilayer structure in which a plurality of layers are laminated. -133574, JP2012-149370A, JP2012-149371, and the like.

Further, the skin-side sheet 2 having the concavo-convex structure of the napkin 1 is formed by connecting the adjacent sheet

joint portions

23 and 23 by heat embossing or ultrasonic embossing to the flexible axis KL that causes the skin-side sheet 2 to bend. However, in addition to embossing, the skin-side sheet 2 may be formed with slits, narrow missing portions, narrow slits, etc., and these may be used as the flexible shaft KL. Moreover, after forming the part which reduced the constituent material in the continuous fiber or the discontinuous line shape in the raw material fiber web before becoming the skin side sheet | seat 2, it shape | molds in a nonwoven fabric, and it is good also considering the part as the flexible axis | shaft KL. One or a combination of two or more of these methods may be used.

As shown in FIG. 2, in the front side convex part 422 in the absorbent core 41 of the napkin 1, the

side parts

422s and 422s are not bent, and the top part 422t from the side edge 41s along the longitudinal direction X of the absorbent core 41. The width d of the front-side convex part 422 is gradually reduced gradually from the side edge 41s along the longitudinal direction X of the absorbent core 41 toward the top part 422t. If the width d of the front-side convex portion 422 is merely gradually reduced, it may be gradually reduced. The front-side convex portion 422 extends straight and straight, and the width d of the front-side convex portion 422 gradually decreases from both

side edges

41s, 41s along the longitudinal direction X of the absorbent core 41 toward the top portion 422t. By doing, it is preferable from the point that the mold release property at the time of releasing from the said accumulation recessed part 55 in the said fiber stacking apparatus improves in addition to the improvement to the fitting property to a body. The same applies to the rear convex portion 423.

The first region 41F and the second region 41R of the napkin 1 have the same thickness, but may have different thicknesses as long as the thickness is smaller than the thickness of the thick portion 42. Moreover, although the basic weight of the 1st area | region 41F and the 2nd area | region 41R of the napkin 1 is the same as long as it is smaller than the basic weight of the thick part 42, a mutually different basic weight may be sufficient. Further, the first region 41F and the second region 41R of the napkin 1 have the groove 45 and the small absorption portion 46, but may not have the groove 45 and the small absorption portion 46 having different shapes. You may do it.

Moreover, although the napkin 1 has the thick part 42 in the excretion facing area B, it may extend from the excretion facing area B to a part on the front area A side or the rear area C side. For example, the front convex part 422 extends from the thick central part 421 of the excretion counter area B into the front area A, and the rear convex part 423 extends from the thick central part 421 of the excretion counter area B to the rear area. It may extend to C. Thus, when the thick part 42 is extended from the excretion opposite area B to the front area A side or the back area C side, the thick part 42 is the front part A or the rear part C. The thickness is thicker than that of the outer peripheral area.

Moreover, although the whole absorptive core 41 of the napkin 1 is integrally molded, it does not need to be integrally molded. For example, in the absorptive core 41, the core material is formed at the same height from the first region 41F to the second region 41R, and then the core material formed by another core material is disposed and thickened. The part 42 may be formed.

Further, as shown in FIG. 1, the napkin 1 is provided with side sheets 5 on both sides along the longitudinal direction X of the skin facing surface of the skin side sheet 2, but at the free end of the side sheet 5, A leak-proof cuff may be formed by arranging an elastic member extending in the longitudinal direction X.

Moreover, in the napkin 1 shown in FIG. 1, the linear pressing groove 7 by which the skin side sheet | seat 2 and the absorptive core 41 were squeezed and integrated is the 1st horizontal pressing groove 71 of the front area A, as shown in FIG. , One vertical pressing groove 73, the first lateral pressing groove 71 in the rear section C, and the other vertical pressing groove 73 is a form having a ring-shaped circumferential groove, but in another form. May be.

Further, the absorbent core 41 of the napkin 1 is formed so that the groove portion 45 is recessed from the skin facing surface side toward the non-skin facing surface side, but the groove portion 45 is directed from the non-skin facing surface side to the skin facing surface side. It may be formed so as to be recessed. Thereby, liquid diffusibility and liquid retention are improved.

In the napkin 1, the size of the front area A of the napkin 1 and the size of the first region 41F of the absorbent core 41 are substantially the same, but may not be the same. Moreover, although the magnitude | size of the back area C of the napkin 1 and the magnitude | size of the 2nd area | region 41R of the absorptive core 41 are substantially corresponded, it does not need to correspond.

Moreover, in the napkin 1, although the thick part 42 was a form which has the middle-high part which protrudes toward a wearer's skin side, it replaces with this, and as shown in FIG.11 and FIG.12, a thick part is shown. The form which 42 protrudes toward the non-skin side sheet | seat 3, ie, the form which protrudes toward a wearer's non-skin side, may be sufficient. In this napkin 1, the skin facing surface and the non-skin facing surface of the absorbent core 41 are reversed in the napkin 1, and the groove 45, the thickness boundary groove 43 and the like are also non-skin facing surfaces. It has an opening on the side. Before wearing, the thick portion 42 protrudes to the non-skin side, but when a load is applied to the absorbent core 41 by wearing, the thin portion around the thick portion 42 moves to the non-skin facing surface side. As a result, the thick part 42 is deformed into a shape similar to the middle and high part protruding to the skin side. Accordingly, the various effects described in the above-described napkin 1 can be obtained in the same manner.
In addition, in the said form, you may arrange | position the groove part 45 and the thickness boundary groove part 43 in the skin opposing surface side.

The absorbent article of the present invention may be a sanitary napkin, a panty liner (cage sheet), an incontinence pad, or the like.

Hereinafter, the present invention will be further described with reference to examples, but the present invention is not limited to the examples.

[Example 1]
A sanitary napkin having the same basic structure as the napkin 1 shown in FIG. 1 was produced. As an absorptive core, the absorptive core of the form shown in FIG. 2 manufactured by the stacking apparatus provided with the stacking drum 54 shown in FIG. 5 was used. The absorbent core 41 was formed as a mixed fiber of pulp fibers and water-absorbing polymer. The absorbent core 41 has a thick portion 42 as a middle-high portion in the intermediate region 41M, and the thick portion 42 includes a thick central portion 421 extending over the entire width of the absorbent core 41, and a front and rear of the thick central portion 421. Each end has a front convex portion 422 and a rear convex portion 423. The thickness of the thick portion 42 was 3.5 mm, and the thickness of the first region 41F and the thickness of the second region 41R were 2.3 mm. The basis weight of the thick part 42 was 350 g / m ² , and the basis weight of the first region 41F and the basis weight of the second region 41R were 250 g / m ² . Thickness and basic weight were measured by the method mentioned above. Further, the total length L2 of the thick portion 42 in the vertical direction X was 63% of the total length L1 of the absorbent core 41 in the vertical direction X.
As the skin side sheet, the second layer disposed on the side of the first layer 21 and the absorber 4 shown in FIGS. 6 and 7, which is manufactured by the method described in Japanese Patent Laid-Open No. 2003-250836, is formed. A concavo-convex structure nonwoven fabric in which the layer 22 was laminated and partially joined was used. The first layer 21 is made of 100% core-sheath type composite fiber having polyethylene terephthalate as a core and polyethylene as a sheath, and the second layer 22 is a latent helical crimpable fiber (NBF-L (manufactured by Daiwabo Co., Ltd.)). V) Fiber, which is a core-sheath type composite fiber having a core made of polyethylene, a sheath made of polypropylene, and a spiral crimp formed by heating. The weight ratio of each layer (upper layer / lower layer) is 50/50. The upper and lower layers are joined by a plurality of sheet joint portions 23 that are arranged in a dispersed manner, and the latent crimpable fibers of the second layer 22 developed shrinkage by heating, and the total basis weight was 74 g / m ² . there were. As the non-skin side sheet, a non-moisture permeable polyethylene film sheet having a basis weight of 25 g / m ² was used.
Next, the absorbent core having the form shown in FIG. 2 was coated with tissue paper to form an absorbent body, and sandwiched between the skin side sheet and the non-skin side sheet to obtain the napkin of Example 1. The absorbent body and the skin side sheet, and the absorbent body and the non-skin side sheet were joined via an adhesive.

[Example 2]
As a skin side sheet, as shown in FIG. 9, the hot melt adhesive bonded with a dryer is invalidated and disassembled from “Laurel Skin Clean Guard Normal Daily Wings” manufactured by Kao Corporation. A nonwoven fabric with a rough structure was used. The basis weight of the nonwoven fabric having the uneven structure was 30 g / m ² . The napkin of Example 2 was produced in the same manner as the napkin of Example 1 except that the sanitary napkin was produced using the uneven structure nonwoven fabric as the skin side sheet.

Example 3
As the skin-side sheet, a nonwoven fabric having a concavo-convex structure shown in FIG. 10 manufactured by the method of JP2013-133574A was used. The non-woven fabric of the concavo-convex structure is a non-woven fabric having a two-layer structure (total basis weight) consisting of an upper layer (2.4 dtex fiber, basis weight 10 g / m ² ) and a lower layer (2.9 dtex fiber, basis weight 15 g / m ² ). 25 g / m ² ). Each of the fibers was a core-sheath fiber having a core made of polyethylene terephthalate and a sheath made of polyethylene. A napkin of Example 3 was produced in the same manner as the napkin of Example 1 except that the sanitary napkin was produced using the uneven structure nonwoven fabric as the skin side sheet.

Example 4
As a skin side sheet, use the skin side sheet with a concavo-convex structure that was made by disabling the hot melt adhesive that was bonded using a dryer from Kao Corporation's 2016 “Laurier water absorption care for pure small amount”. It was. The skin-side sheet having the uneven structure had a basis weight of 28 g / m ² . A napkin of Example 4 was produced in the same manner as the napkin of Example 1 except that a sanitary napkin was produced using the skin-side sheet having the uneven structure.

[Comparative example]
A napkin of Comparative Example 1 was produced in the same manner as the napkin of Example 1 except that a sanitary napkin was produced using a flat structure air-through nonwoven fabric having a basis weight of 25 g / m ² as the skin side sheet. .

[Evaluation]
The napkin of Examples 1 to 4 and the napkin of Comparative Example 1 were measured for the diffusion area and the amount of absorption by the following method, and the results are shown in Table 1.

[Diffusion area]
An acrylic liquid injection plate was placed on the napkins of Examples 1 to 4 and Comparative Example 1, and 9 g of horse defibrinated blood (Japan Biotest Laboratories) was weighed into a beaker in 1 second. Injected. The acrylic liquid injection plate has a length of 150 mm, a width of 60 mm, and a weight of 62 g. An elliptical cylinder for injecting liquid protrudes from the center of the liquid injection plate. The protrusions had a height of 30 mm, and both the elliptical opening diameter on the liquid injection side and the elliptical opening diameter on the bottom side had a maximum diameter of 50 mm in the longitudinal direction and a maximum diameter of 20 mm in the width direction. The liquid injection plate was arranged so that the longitudinal direction of the liquid injection plate coincided with the lateral direction of the napkin, and the position of the protrusion of the liquid injection plate coincided with the center position of the napkin. Immediately after the injection of 9 g of equine defibrinated blood, weights corresponding to seat pressure (load 20 g / cm ² ) were placed on both ends in the longitudinal direction of the liquid injection plate, and the liquid injection plate and the weight were removed after 1 minute. . Then, the area where the equine defibrinated blood on the skin side sheet adheres was measured from the skin facing surface side of the napkin. The measurement was performed by using a NEWQUE (ver. 4.20) manufactured by NEXT as an image analysis apparatus (through a CCD camera or a scanner) to capture an image.

[Absorption]
Using an acrylic liquid injection plate similar to the measurement of the diffusion area described above, an acrylic liquid injection plate was placed on the napkins of Examples 1 to 4 and Comparative Example 1, and the length of the liquid injection plate was Weights corresponding to seat pressure (load 20 g / cm ² ) were arranged on both ends in the direction. After taking 9 g of horse defibrinated blood (Japan Biotest Laboratories Co., Ltd.) in a beaker and injecting it in 1 second as the initial injection, increase the amount of the horse defibrated blood by 1 g. The state in which the liquid exudes beyond the end in the width direction was defined as a mole state. When leakage occurred during the initial injection, the evaluation was performed under the condition that the initial injection amount was decreased by 1 g, and the evaluation was terminated when the leakage state was reached. The injected amount when the mole state occurred was measured as the absorbed amount.

As is apparent from the results shown in Table 1, the napkins of Examples 1 to 4 had a smaller diffusion area when 9 g of liquid was absorbed than the napkins of the comparative examples. In addition, the napkins of Examples 1 to 4 had a larger absorption amount until reaching the mole state than the napkins of the comparative examples, and the results were less likely to be molested.
The napkins of Examples 1 to 4 are located at positions corresponding to the front-side convex portion 422 or the rear-side convex portion 423 at the front and rear end portions of the thick central portion 421 and the boundary portion BL around the contour of the thick portion 42. By having a flexible shaft that is the starting point for bending the skin side sheet, even if a load equivalent to a seating pressure is applied, the skin side sheet can easily be along the boundary of the absorbent core, and the skin side sheet can be moved from the absorbent core. It is considered that the liquid was difficult to spread on the surface and more difficult to leak.

According to the present invention, even when the absorbent article is worn in a slightly shifted state, it is difficult to form a gap between the skin of the wearer due to excellent fit to the body shape, and further, the skin side sheet and the absorption are absorbed. Since it becomes difficult to generate a gap between the adhesive core and the core, it is possible to prevent side leakage due to the liquid flow flowing on the surface of the skin-side sheet and to exhibit sufficient absorption performance.

Claims

The liquid-permeable skin-side sheet placed on the skin-facing surface side, the liquid-impermeable non-skin-side sheet placed on the non-skin-facing surface side, and the front and back of the wearer placed between these two sheets An absorbent article having a longitudinally long absorbent core corresponding to a direction and having a front section and a rear section,
The absorbent core has an intermediate region between a first region located on the front region side and a second region located on the rear region side, and the intermediate region includes the first region and the second region. It has a thick part thicker than the thickness in the two areas,
The thick portion has a maximum width portion in which the length in the lateral direction orthogonal to the longitudinal direction of the absorbent core is maximized in plan view of the absorbent core, The length in the direction is the same as the lateral length of the absorbent core;
The absorbent core has a boundary portion at a position around the contour of the thick portion in the absorbent core,
The said skin side sheet | seat is an absorptive article which has a flexible axis | shaft used as the cause by which this skin side sheet | seat is bent in the position corresponding to the said boundary part in the said absorptive core.
The boundary portion of the absorbent core has a thick boundary groove portion that divides the thick portion and a portion other than the thick portion in the intermediate region,
The absorbent article according to claim 1, wherein the thick boundary groove is disposed over the entire length in the lateral direction of the absorbent core.
The skin side sheet is formed of a nonwoven fabric,
The absorbent article according to claim 1, wherein the flexible shaft extends on an imaginary line connecting portions where the thickness of the nonwoven fabric is thinner than the surrounding thickness.
The skin side sheet is formed of a nonwoven fabric,
The flexible shaft of the skin-side sheet extends on an imaginary line connecting portions where the constituent fibers of the nonwoven fabric are compressed and the density of the constituent fibers is higher than the density of the surrounding portion. 4. The absorbent article according to any one of items 1 to 3.
A plurality of the flexible shafts of the skin-side sheet are arranged in a plan view of the absorbent article, and the plurality of flexible shafts intersect the boundary portion of the absorbent core. 5. The absorbent article according to any one of 1 to 4.
The skin-side sheet is a sheet having a concavo-convex structure having a plurality of skin-side protrusions on the skin-facing surface side, and the fiber density of the recesses between the skin-side protrusions is the fiber density of the top of the skin-side protrusion. The absorbent article according to any one of claims 1 to 5, wherein the absorbent article is higher.
The skin-side sheet is a sheet having a concavo-convex structure having a plurality of skin-side protrusions on the skin-facing surface side, and the height at the top of the skin-side protrusion is equal to the thick part of the absorbent core and the first part. The absorbent article according to any one of claims 1 to 6, wherein the absorbent article has a level difference of not less than one region or the second region.
The skin-side sheet is a sheet having a concavo-convex structure having a plurality of skin-side protrusions on the skin facing surface side, and the sheet having the concavo-convex structure has heat-shrinkable fibers or heat-extensible fibers. The absorbent article according to any one of 1 to 7.
The skin-side sheet is a sheet having a concavo-convex structure having a plurality of skin-side protrusions on the skin-facing surface side, and the skin-side protrusions are arranged in a dotted pattern in plan view of the skin-side sheet. The absorbent article according to any one of claims 1 to 8.
The said skin side sheet | seat is a sheet | seat of the uneven structure which has several skin side protrusion part in the skin opposing surface side, This sheet | seat is distribute | arranged to the 1st layer and the said absorbent core side which form a skin opposing surface. Two layers are laminated and partially joined,
The absorbent article according to any one of claims 1 to 9, wherein the fiber density of the second layer is higher than the fiber density of the first layer.
The skin-side sheet according to any one of claims 1 to 10, wherein the skin-side sheet is a concavo-convex structure sheet having a plurality of skin-side protrusions on the skin-facing surface side, and the inside of the skin-side protrusion is solid. The absorbent article as described.
The skin-side sheet is a sheet having a concavo-convex structure having a plurality of skin-side protrusions on the skin-opposing surface side, and the skin-side protrusion extends continuously in one direction. The absorbent article of Claim 1.
The thickened portion extends in the horizontal direction perpendicular to the longitudinal direction of the absorbent core in a plan view of the absorbent core and extends vertically along both side edges along the longitudinal direction of the absorbent core. A thick central portion extending to a predetermined length in the direction, and extending in a lateral direction from the maximum width portion toward the first region from the longitudinal front end of the thick central portion. The length of the front side convex part which is narrow or the length in the lateral direction is narrower than the maximum width part from the longitudinal rear end part of the thick central part toward the second region side. The absorbent article according to any one of claims 1 to 12, further comprising a rear-side convex portion.
The absorbent article according to claim 13, wherein the thick part has the front convex part and the rear convex part.
The boundary portion of the absorbent core has a thick boundary groove portion that defines a boundary between the thick portion and a portion other than the thick portion in the intermediate region,
The absorbent core has a thickness adjacent portion in a region excluding the thickness portion and the thickness boundary groove portion in the intermediate region,
The absorptivity according to any one of claims 1 to 14, wherein a basis weight of the thickness adjacent portion is smaller than a basis weight of the thickness portion and larger than a basis weight of the thickness boundary groove portion. Goods.
The thickened portion extends in the horizontal direction perpendicular to the longitudinal direction of the absorbent core in a plan view of the absorbent core and extends vertically along both side edges along the longitudinal direction of the absorbent core. A thick central portion extending to a predetermined length in the direction, one front convex portion protruding from the longitudinal front end of the thick central portion toward the first region, and the thick central portion One rear-side convex portion that is convex toward the second region side from the longitudinal rear end portion of the portion,
The front side convex portion has both sides forming the front side convex portion extending from a top portion of the front side convex portion to a side edge along a longitudinal direction of the absorbent core, and the boundary portion. Extends in a straight line,
In the rear side convex portion, both sides forming the rear side convex portion respectively extend from the top of the rear side convex portion to the side edge along the longitudinal direction of the absorbent core, and the boundary portion The absorbent article according to any one of claims 1 to 15, wherein is extended in a linear shape.
The thickened portion extends in the horizontal direction perpendicular to the longitudinal direction of the absorbent core in a plan view of the absorbent core and extends vertically along both side edges along the longitudinal direction of the absorbent core. A thick central portion extending to a predetermined length in the direction, one front convex portion protruding from the longitudinal front end of the thick central portion toward the first region, and the thick central portion One rear-side convex portion that is convex toward the second region side from the longitudinal rear end portion of the portion,
Both sides forming the boundary part or the rear side convex part extending along the both sides forming the front side convex part are formed by transverse folding lines generated when the absorbent article is folded into the individual form. The absorbent article according to any one of claims 1 to 16, wherein the absorbent article is disposed at a position intersecting with the boundary portion extending along the side.
The thickened portion extends in the horizontal direction perpendicular to the longitudinal direction of the absorbent core in a plan view of the absorbent core and extends vertically along both side edges along the longitudinal direction of the absorbent core. A thick central portion extending to a predetermined length in the direction, one front convex portion protruding from the longitudinal front end of the thick central portion toward the first region, and the thick central portion One rear-side convex portion that is convex toward the second region side from the longitudinal rear end portion of the portion,
The absorbent article has a pair of squeezing grooves extending in the longitudinal direction of the absorbent core as a linear squeezing groove in which the skin side sheet and the absorbent core are squeezed and integrated,
The squeezing groove is arranged at a position intersecting with the boundary portion extending along both sides forming the front convex portion or the boundary portion extending along both sides forming the rear convex. The absorbent article according to any one of claims 1 to 17.
The skin side sheet is a sheet having a concavo-convex structure having a plurality of skin side protrusions on the skin facing surface side,
The thickened portion extends in the horizontal direction perpendicular to the longitudinal direction of the absorbent core in a plan view of the absorbent core and extends vertically along both side edges along the longitudinal direction of the absorbent core. A thick central portion extending to a predetermined length in the direction, one front convex portion protruding from the longitudinal front end of the thick central portion toward the first region, and the thick central portion One rear-side convex portion that is convex toward the second region side from the longitudinal rear end portion of the portion,
The thickness center portion is formed so that the basis weight thereof is reduced from the center portion in the horizontal direction toward the both side portions along the vertical direction in a cross-sectional view,
The skin-side projecting portion of the skin-side sheet is disposed at a position corresponding to the top of the front-side convex portion or the top of the rear-side convex portion. Absorbent articles.
The skin side sheet is a sheet having a concavo-convex structure having a plurality of skin side protrusions on the skin facing surface side,
The thickened portion extends in the horizontal direction perpendicular to the longitudinal direction of the absorbent core in a plan view of the absorbent core and extends vertically along both side edges along the longitudinal direction of the absorbent core. A thick central portion extending to a predetermined length in the direction, one front convex portion protruding from the longitudinal front end of the thick central portion toward the first region, and the thick central portion One rear-side convex portion that is convex toward the second region side from the longitudinal rear end portion of the portion,
The thickness center portion is formed so that its height decreases from the center portion in the horizontal direction toward the both side portions along the vertical direction in a cross-sectional view,
The skin-side protruding portion of the skin-side sheet is disposed at a position corresponding to the top portion of the front-side convex portion or the top portion of the rear-side convex portion. Absorbent articles.
In the first region and the second region of the absorbent core, a laterally extending groove is disposed, and the basis weight of the groove is greater than the portion of the first region and the second region other than the groove. The absorbent article according to any one of claims 1 to 20, wherein the basis weight of the absorbent core forming material is low.
In the first region and the second region of the absorbent core, a groove portion extending in the longitudinal direction is disposed, and the basis weight of the groove portion is greater than the portion of the first region and the second region other than the groove portion. The absorbent article according to any one of claims 1 to 21, wherein the basis weight of the absorbent core forming material is low.
The absorbent article according to any one of claims 1 to 22, wherein the thick part is a middle-high part protruding toward the skin side sheet.
The absorbent article according to any one of claims 1 to 22, wherein the thick part protrudes toward the non-skin side sheet.