WO2022224995A1 - Absorbent article - Google Patents

Abstract

A back sheet (10) of an absorbent article (1) according to the present invention includes a first sheet (11), a second sheet (12), and a third sheet (13) which are disposed in order from the skin-facing surface side toward a non-skin-facing surface. The third sheet (13) forms the non-skin-facing surface of the absorbent article (1). The absorbent article (1) has a first bonding region (41) in which the first sheet (11) and the second sheet (12) are bonded to each other via an adhesive and a second bonding region (45) in which the second sheet (12) and the third sheet (13) are bonded to each other via an adhesive. In a plan view, the first bonding region and the second bonding region at least partially overlap with each other. The first bonding region (41) and the second bonding region (45) each have an adhesive placement part (42, 46) at which the adhesive is disposed and an adhesive non-placement part (43, 47) at which the adhesive is not disposed. The area ratio of the adhesive placement part in the first bonding region (41) is lower than that of the adhesive placement part in the second bonding region (45).

Description

absorbent article

The present invention relates to absorbent articles.

Absorbent articles such as disposable diapers generally comprise an absorbent body with an absorbent core and a plurality of sheets arranged on the non-skin facing side of the absorbent body. For example, the present applicant has previously proposed an absorbent body comprising a liquid-permeable topsheet, a liquid-proof backsheet, and a liquid-retaining absorbent body interposed therebetween, and the absorbent body. and an exterior body located on the back sheet side of the absorbent body, and the back sheet and the exterior body are intermittently coated in stripes in a portion excluding both longitudinal side edges and front and rear ends of the absorbent body. (Patent Document 1) disclosed an absorbent article that is adhered by an adhesive.

In addition, the present applicant has previously found that the absorbent body is arranged on the non-skin-facing side of the absorbent body, the outer layer sheet, the inner layer sheet, the elastic member between these sheets, and the elastic member intermittently arranged in the longitudinal direction along the lateral direction. elastic members are intermittently arranged in the longitudinal direction in the stretchable region of the outer body, and the adhesive strip is provided between each of the elastic members adjacent to each other in the longitudinal direction. An absorbent article has been disclosed in which one or more strips are arranged and the outer layer sheet and the inner layer sheet are fixed via the belt-like adhesive (Patent Document 2).

In addition, the present applicant has previously proposed an outer body having an outer layer sheet, an inner layer sheet, leg elastic members between these sheets, and a leg adhesive for fixing them, which are disposed on the non-skin facing side of the absorbent body. , each leg adhesive is arranged in the lateral direction in the region where the leg elastic members in the longitudinal direction are arranged in the unfolded state of the diaper, and the leg adhesives adjacent to each other in the longitudinal direction An absorbent article has been disclosed in which the intervals are arranged at two or more different intervals (Patent Document 3).

JP 2005-095261 A JP 2016-022235 A JP 2016-022236 A

The present invention has a topsheet, a backsheet, and an absorbent core disposed between the topsheet and the backsheet, and comprises a longitudinal direction corresponding to the front-rear direction of the wearer and a lateral direction orthogonal to the longitudinal direction. It relates to directional absorbent articles.
The backsheet preferably has a first sheet, a second sheet, and a third sheet in order from the skin-facing side toward the non-skin-facing side.
The third sheet preferably forms a non-skin facing surface of the absorbent article.
The back sheet includes a first joint region where the first sheet and the second sheet are joined with an adhesive, and a second joint region where the second sheet and the third sheet are joined with an adhesive. It is preferable that there are two bonding areas, and that the first bonding area and the second bonding area at least partially overlap in plan view.
It is preferable that each of the first bonding area and the second bonding area has an adhesive-applied portion on which the adhesive is applied and an adhesive-non-applied portion on which the adhesive is not applied.
It is preferable that the first bonding region has a lower area ratio of the adhesive placement portion than the second bonding region.

FIG. 1 is a plan view showing an unfolded and stretched state of a disposable diaper that is one embodiment of the present invention. FIG. 2 is a sectional view taken along line II-II of FIG. FIG. 3(a) is a plan view for explaining the position of the first joint region, and FIG. 3(b) is a plan view for explaining the position of the second joint region. FIG. 4 is a longitudinal cross-sectional view of the overlapping area shown in FIG. 5(a) and 5(b) are cross-sectional views along the longitudinal direction for explaining the effects of the superimposed region. FIG. 6 is a plan view showing the coating pattern of the adhesive forming the first bonding area and the second bonding area according to the present invention.

Detailed description of the invention

A plurality of sheets arranged on the non-skin-facing side of the absorbent article are constituent members that can affect the appearance and feel of the absorbent article. The outer surface of the absorbent article is often visible to the user such as the wearer and the wearer's guardian, and is often touched by the user's fingers when wearing the absorbent article. The outer surface of the article is required to have excellent texture and good texture. The absorbent articles described in Patent Documents 1 to 3 take into consideration the softness and texture of the outer surface of the absorbent article, but no special consideration has been made from the viewpoint of achieving both appearance and touch.

The present invention relates to an absorbent article that can achieve both good appearance and good touch.

The present invention will be described below based on its preferred embodiments with reference to the drawings. 1 and 2 show an underpants-type disposable diaper 1 (hereinafter simply referred to as "diaper 1") which is an embodiment of the absorbent article of the present invention. The diaper 1 has an abdominal portion A arranged on the abdomen side of the wearer in the wearing state, a dorsal portion B arranged on the dorsal side of the wearer, and between the abdominal portion A and the dorsal portion B. It has a crotch part C located. The diaper 1 has a longitudinal direction X corresponding to the direction corresponding to the front-rear direction of the wearer, that is, the direction extending from the abdominal portion A to the back portion B via the crotch portion C, and the lateral direction orthogonal to the longitudinal direction X. Y.

The diaper 1 includes an absorbent body 22 in the central portion in the lateral direction Y, and a backsheet 10 disposed on the non-skin facing side of the absorbent body 22, that is, on the side farther from the wearer's body than the absorbent body 22. (see FIG. 2).

As used herein, the term “skin-facing surface” refers to the surface of the absorbent article or its constituent members (for example, the topsheet 21) that faces the wearer's skin when the absorbent article is worn, that is, the surface that faces the wearer's skin when the absorbent article is worn. The "non-skin-facing surface", which is the side close to the skin, is the surface of the absorbent article or its constituent members that faces away from the skin when the absorbent article is worn. far side. It should be noted that the term "when worn" as used herein means a state in which the absorbent article is maintained in a normal and appropriate wearing position, that is, in a correct wearing position of the absorbent article.

As shown in FIG. 1, the diaper 1 is formed symmetrically with respect to a vertical center line CL that extends in the vertical direction X and bisects the diaper 1 in the horizontal direction Y in the unfolded and stretched state. . As shown in FIG. 1, the absorber 22 has a rectangular shape in plan view, and its longitudinal direction is aligned with the longitudinal direction X of the diaper 1 in the unfolded and stretched state. The absorber 22 is arranged in the lateral direction Y central portion of the exterior body 3 (the second sheet 12 and the third sheet 13), which will be described later, in plan view, and is joined to the back sheet 10 with an adhesive.
The "unfolded and stretched state" of the diaper 1 means that the diaper 1 is cut off at the side seal portion S to be in the unfolded state, and the elastic members of each part of the diaper 1 in the unfolded state are stretched to the design size (the influence of the elastic member is completely removed). It means the state in which it is expanded until it becomes the same dimension as when it is expanded in a flat state in the excluded state). In this specification, each dimension such as the length in the vertical direction X or the horizontal direction Y at each part of the diaper 1 is the dimension in a state where each member is stretched by stretching the elastic member of each part, unless otherwise specified. (design dimensions).

The diaper 1 comprises, as shown in FIG. , 26 is provided. In the absorbent main body 2, the surface sheet 21, the absorbent body 22, the pair of leak-proof cuffs 26, and the leak-proof sheet 28 are integrated by known bonding means such as an adhesive. The absorbent main body 2 has a rectangular shape elongated in the longitudinal direction X in plan view, and extends in the longitudinal direction X from the ventral portion A to the dorsal portion B. As shown in FIG. The positions of both ends in the longitudinal direction X of the absorbent main body 2 in the present embodiment substantially match the positions of both ends in the longitudinal direction X of the absorber 22 . The leak-proof sheet 28 of this embodiment corresponds to the first sheet 11 described later.

The absorbent body 22 extends between the ventral side A and the dorsal side B in the longitudinal direction X, and includes a liquid-retaining absorbent core 24 and a core wrap sheet that contacts and wraps the outer surface thereof. 25.
The absorbent core 24 of this embodiment, as shown in FIG. have. Each of the pair of side absorbent cores 24S, 24S and central absorbent core 24C extends in the longitudinal direction X in the crotch portion C. As shown in FIG. Also, the central absorbent core 24C has a two-layer structure, while the side absorbent cores 24S have a single-layer structure. The absorbent core 24 of this embodiment has a side bending guide portion 23S between the side absorbent cores 24S and the central absorbent core 24C, and a central bending guide portion between the pair of central absorbent cores 24C. 23C. The absorbent body 22 can be deformed so that the side absorbent core 24S is lifted toward the wearer's skin starting from the side bending guide portions 23S, 23S (see FIG. 2). Also, the absorber 22 can be deformed so that the pair of central absorbent cores 24C are bent in mountain folds starting from the central bending guide portion 23C (not shown).

The side bending guide portions 23S, 23S and the center bending guide portion 23C of the absorbent body 22 of this embodiment are formed of through holes extending in the longitudinal direction X and passing through the absorbent core 24. As shown in FIG. Alternatively, the side bending guide portions 23S, 23S and the center bending guide portion 23C may be recesses formed on the skin facing surface or non-skin facing surface of the absorbent core 24. FIG.

The absorber 22 of this embodiment has core elastic members 31 arranged in a state of being stretched in the longitudinal direction X on each side along the longitudinal direction X. As shown in FIG. The core elastic members 31 are arranged between the absorbent core 24 and the core wrap sheet 25 on both sides along the longitudinal direction X of the absorbent body 22 . The contraction of the core elastic member 31 in the longitudinal direction X can assist the deformation of the side absorbent core 24S starting from the side bending guide portion 23S. That is, the side absorbent core 24S is easily deformed so as to be lifted toward the wearer's skin.

As shown in FIG. 1, the absorbent main body 2 has a pair of anti-leakage cuffs 26, 26 on both sides along the longitudinal direction X on its skin-facing surface. As shown in FIG. 2, the leak-proof cuff 26 of this embodiment is formed by folding a liquid-resistant or water-repellent and breathable leak-proof cuff-forming sheet 27 into two sheets facing each other. It is formed by bonding the forming sheets 27 together. The leak-proof cuff 26 of this embodiment includes a cuff elastic member 35 and an outer cuff elastic member 32 between two sheets 27 for forming a leak-proof cuff that are opposed to each other. The cuff elastic member 35 is arranged at the inner end of the leak-proof cuff 26 in the lateral direction Y, and the outer cuff elastic member 32 is arranged at the outer end of the leak-proof cuff 26 in the lateral direction Y. (See Figures 1 and 2). The cuff elastic member 35 and the outer cuff elastic member 32 are arranged in the longitudinal direction X in a stretched state. Each leak-proof cuff 26 has a base end fixed between the absorbent body 22 and the leak-proof sheet 28 in the absorbent main body 2 and a free end to which the cuff elastic member 35 is fixed. The leak-preventing cuff 26 is configured such that a free end portion of the leak-preventing cuff 26 rises at least at the crotch portion C by contraction of the cuff elastic member 35 arranged in a stretched state in the longitudinal direction X. As shown in FIG. In addition, the outer cuff elastic member 32 contracts in the longitudinal direction X to assist the leakage prevention cuff 26 to stand up.

As shown in FIG. 2, the backsheet 10 has a first sheet 11, a second sheet 12, and a third sheet 13 in order from the skin-facing side toward the non-skin-facing side. In other words, the backsheet 10 has the third sheet 13, the second sheet 12, and the first sheet 11 in order from the non-skin-facing side of the diaper 1 toward the skin-facing side. The non-skin facing surface of the diaper 1 is formed by the third sheet 13 of the backsheet 10 . Thus, the back sheet 10 is arranged on the non-skin facing side of the absorbent core 24 and the third sheet 13 forms the non-skin facing side of the diaper 1 . The first sheet 11 and the second sheet 12 are directly joined, and the second sheet 12 and the third sheet 13 are directly joined.
The backsheet 10 of the present embodiment is arranged on the non-skin facing side of the absorber 22 (core wrap sheet 25). The backsheet 10 of the present embodiment includes a leak-proof sheet 28 forming the non-skin facing surface of the absorbent body 2 as the first sheet 11 . Further, the back sheet 10 includes a second sheet 12 and a third sheet 13 arranged on the non-skin facing side of the absorbent body 2 . The constituent members (the second sheet 12 and the third sheet) arranged on the non-skin-facing side of the absorbent body 2 are also referred to as an exterior body 3 . The second sheet 12 and the third sheet 13 in the exterior body 3 have the same shape and size in plan view.
The first sheet 11 (leakproof sheet 28) of the present embodiment is a moisture-permeable film, and each of the second sheet 12 and the third sheet 13 is a fiber sheet made of a fiber material.
In FIG. 2, illustration of a first adhesive placement portion 42 and a second adhesive placement portion 46, which will be described later, is omitted.

In the exterior body 3, both side edges along the longitudinal direction X of the exterior body 3 in each of the ventral part A and the dorsal part B are sealed by a known adhesive such as a hot melt adhesive, heat sealing, ultrasonic sealing and the like. A pair of side seals S, S, a waist opening through which the torso of the wearer is passed, and a pair of leg openings through which the lower legs of the wearer are passed are formed by being joined together by the joining means. (not shown).

The outer body 3 forms the outer shape of the diaper 1 in the unfolded and stretched state as shown in FIG. C and dorsal part B are formed respectively. As shown in FIG. 1, in the crotch portion C of the exterior body 3, both side edge portions along the longitudinal direction X of the exterior body 3 are curved in a convex arc shape toward the center in the lateral direction Y. The central region of X is constricted inward in the horizontal direction Y. The exterior body 3 and the absorbent main body 2 are joined by a known joining means such as an adhesive. At least one of the second sheet 12 and the third sheet 13 in the outer body 3 is folded back along the peripheral edge WE of the waist opening toward the skin facing side.

In the outer package 3, the third sheet 13 forms the outer surface of the diaper 1, that is, the non-skin facing surface, and the second sheet 12 is arranged on the skin facing surface side of the third sheet 13. The exterior body 3 has a plurality of thread-like or belt-like elastic members 36 and 37 arranged between the second sheet 12 and the third sheet 13 . Specifically, the exterior body 3 includes waist elastic members 36 arranged along the lateral direction Y in the abdominal portion A and the dorsal portion B, and leg elastic members 37 arranged along the leg openings. (See FIG. 1). In the present embodiment, the waist elastic member 36 arranged at a position overlapping the absorbent main body 2 in the longitudinal direction X is elastically stretchable in the region overlapping the absorbent main body 2 in the thickness direction Z by processing such as dividing finely. However, the waist elastic member 36 may exhibit elastic stretchability in the region. The waist elastic members 36 are stretched in the horizontal direction Y and intermittently arranged in the vertical direction X at predetermined intervals in each of the abdominal portion A and the back portion B. As shown in FIG. In this way, the waist elastic member 36 is arranged in a state in which its elastic stretchability is exhibited, so that the opening edge of the waist opening has an annular shape that is substantially continuous over the entire circumference. Waist gathers (folds) are formed.

One or a plurality of thread-like or belt-like leg elastic members 37 for forming leg gathers are arranged in a stretchable state on the leg edge portion LS forming the opening edge portion of the leg opening in the outer body 3 . . The leg elastic member 37 extends from a portion of the dorsal portion B on the side of the crotch portion C in the longitudinal direction X, that is, on the central side in the longitudinal direction X, through the crotch portion C, to a portion of the ventral portion A on the central side in the longitudinal direction X. (see Figure 1). Since the leg elastic member 37 is arranged in a stretched state, an annular leg gather that is substantially continuous over the entire circumference is formed at the opening edge of the leg opening (leg edge LS). be. This leg elastic member 37 is also sandwiched and fixed between the third sheet 13 and the second sheet 12 that constitute the exterior body 3 by a bonding means such as an adhesive.

In the backsheet 10, the first sheet 11 and the second sheet 12, and the second sheet 12 and the third sheet 13, which are adjacent to each other in the thickness direction Z of the diaper 1, are joined via an adhesive. The diaper 1 includes a first joint region 41 in which the first sheet 11 and the second sheet 12 are joined with an adhesive, and a first joint region 41 in which the second sheet 12 and the third sheet 13 are joined with an adhesive. It has two bonding regions 45 [see FIGS. 3(a) and 3(b)].
In the diaper 1, the absorbent main body 2 and the outer body 3 are joined in the first joint region 41, and the sheets 12, 13 constituting the outer body 3 and the leg elastic members 37 are joined in the second joint region 45. ing.

Each of the first bonding region 41 and the second bonding region 45 has adhesive placement portions 42 and 46 to which the adhesive is applied and adhesive non-placement portions 43 and 47 to which the adhesive is not applied. [see FIGS. 3(a) and 3(b)]. Hereinafter, the adhesive placement portion 42 in the first bonding region 41 will be referred to as the "first adhesive placement portion 42", and the adhesive non-placement portion 43 in the first bonding region 41 will be referred to as the "first adhesive non-placement portion 43". . Further, the adhesive placement portion 46 in the second bonding region 45 is referred to as the "second adhesive placement portion 46", and the adhesive non-placement portion 47 in the second bonding region 45 is referred to as the "second adhesive non-placement portion 47". .
In the first bonding region 41 , the first adhesive placement portions 42 and the first adhesive non-placement portions 43 are alternately arranged in the vertical direction X and extend along the horizontal direction Y, respectively. Also, in the second bonding region 45, the second adhesive placement portions 46 and the second adhesive non-placement portions 47 are alternately arranged in the vertical direction X and extend along the horizontal direction Y, respectively. That is, in each of the first bonding region 41 and the second bonding region 45, the adhesive is intermittently applied in stripes extending in the horizontal direction Y. As shown in FIG.

The first joint region 41 is located in a region overlapping with the absorbent body 22, and has a rectangular shape in plan view like the absorbent body 22 (see FIG. 3(a)). The positions of both ends in the horizontal direction Y of the first joint region 41 substantially coincide with the positions of both ends in the horizontal direction Y of the absorbent main body 2 . The positions of both ends in the longitudinal direction X of the first joint region 41 substantially coincide with the positions of both ends in the longitudinal direction X of the absorber 22 .

The second joint region 45 consists of a portion of the exterior body 3 (third sheet 13) where the central region in the longitudinal direction X is constricted inward in the lateral direction Y, and the longitudinal It is arranged in a region which is on the inner side in the X direction and which is adjacent to the constricted portion in the longitudinal direction X (see FIG. 3B). In the second bonding region 45, the second adhesive placement portion 46 is arranged continuously over the entire length in the lateral direction Y of the region. Both ends of the second joint region 45 in the longitudinal direction X are positioned inward in the longitudinal direction X of both ends of the absorber 22 in the longitudinal direction X. As shown in FIG.

In a plan view of the diaper 1, the first joint region 41 and the second joint region 45 at least partially overlap. In the present embodiment, the first joint region 41 overlaps the second joint region 45 on the inner side in the vertical direction X of the region 41 . Hereinafter, the region where the first bonding region 41 and the second bonding region 45 overlap is also referred to as an "overlapping region 48" (see FIG. 3B). The overlapping region 48 of the present embodiment extends in the vertical direction X in plan view and is positioned so as to partially overlap the absorbent body 22 (see FIGS. 3(a) and 3(b)).

4 shows a cross-sectional view along the longitudinal direction X of the backsheet 10 in the overlapping region 48. As shown in FIG. In FIG. 4, the backsheet 10 is shown in a state of being stretched in the longitudinal direction X. As shown in FIG. The first bonding region 41 has a lower area ratio of the adhesive placement portion than the second bonding region 45 . In other words, the first bonding region 41 has a higher area ratio of the non-adhesive portion than the second bonding region 45 . The advantage of making the area ratio of the adhesive placement portion different between the first bonding region 41 and the second bonding region 45 is as described below.

5(a) and 5(b) show cross-sectional views along the longitudinal direction X of the backsheet 10 in a non-stretched state. Reference numeral 20 in FIGS. 5(a) and 5(b) indicates a constituent member of the diaper 1 located on the skin-facing side of the backsheet 10. As shown in FIG.
As shown in FIG. 5( a ), the back sheet 10 of the diaper 1 has the first sheet 11 and the second sheet 12 in a non-bonded state at the first adhesive non-arrangement portion 43 , and the second adhesive is applied to the back sheet 10 . The second sheet 12 and the third sheet 13 are in a non-bonded state at the non-arrangement portion 47 . As a result, in each of the first adhesive non-arrangement portion 43 and the second adhesive non-arrangement portion 47, folds that bulge toward the non-skin facing surface side are formed. In this case, due to the fact that the area ratio of the adhesive arrangement portion of the first bonding region 41 is lower than that of the second bonding region 45, the second adhesive non-arrangement portion 47 does not have the first adhesive non-arrangement portion A finer fold is formed than the fold at 43 . Further, as shown in FIG. 5A, in the overlapping region 48, a fold structure is formed in which the folds in the first adhesive non-arranged portion 43 and the folds in the second adhesive non-arranged portion 47 overlap in the thickness direction Z. Therefore, when the back sheet 10 is touched with fingers, the user feels as if the back sheet 10 is gradually crushed, and a good cushion feeling is perceived. When the non-skin-facing surface of the superimposed region 48 is stroked in a direction orthogonal to the extending direction of the adhesive placement portions 42 and 46 (the direction indicated by the arrow in FIG. 5B), the first adhesive non-placement portion 43 Since the fine folds in the second adhesive non-arranged portion 47 move following the large folds in the back sheet 10, the backsheet 10 exhibits a smooth feel and excellent texture (see FIG. 5(b)). In addition, when the fine folds are formed in the second adhesive non-arranged portion 47, wrinkles caused by joining the second sheet 12 and the third sheet 13 become less noticeable, and the non-skin facing surface of the overlapping region 48 becomes less noticeable. Better appearance. Therefore, in the diaper 1, both the good appearance and the good touch of the diaper 1 can be achieved. Furthermore, the inside of the folds in the first adhesive non-arranged portion 43 and the inside of the folds in the second adhesive non-arranged portion 47 function as air passages, so that the air permeability of the backsheet 10 can be maintained satisfactorily. .

The first bonding region 41 includes a virtual line connecting the edges of the first adhesive placement portions 42 adjacent in the vertical direction X or the horizontal direction Y with the first adhesive non-placement portion 43 interposed therebetween, and the first adhesive It is a region surrounded by the extending direction of the placement portion 42 and the outer edge of the first adhesive placement portion 42 positioned most outward on both sides in the orthogonal direction.
The second bonding region 45 includes a virtual line connecting the edges of the second adhesive placement portions 46 that are adjacent in the longitudinal direction X or the lateral direction Y with the second adhesive non-arrangement portion 47 interposed therebetween, and the second adhesive It is a region surrounded by the extending direction of the placement portion 46 and the outer edge of the second adhesive placement portion 46 positioned at the outermost side on both sides in the orthogonal direction.

From the viewpoint of further improving the effects described above, the area ratio of the first adhesive placement portion 42 in the first bonding region 41 is set to the area ratio of the second adhesive placement portion 46 in the second bonding region 45 (first area ratio of adhesive placement portion 42/area ratio of second adhesive placement portion 46), preferably 0.2 or more, more preferably 0.3 or more, and preferably 0.9 or less, more preferably 0 0.7 or less, preferably 0.2 or more and 0.9 or less, more preferably 0.3 or more and 0.7 or less.
The area ratio of the first adhesive placement portion 42 in the first bonding region 41 is preferably 10% or more, more preferably 12% or more, and is preferably 50% or less, more preferably 25% or less, and It is preferably 10% or more and 50% or less, more preferably 12% or more and 25% or less.
The area ratio of the second adhesive placement portion 46 in the second bonding region 45 is preferably 12% or more, more preferably 15% or more, and is preferably 50% or less, more preferably 35% or less, and It is preferably 12% or more and 50% or less, more preferably 15% or more and 35% or less.

The area ratio of the first adhesive placement portion 42 is obtained by dividing the total area of the first adhesive placement portion 42 in the first bonding region 41 by the area of the first bonding region 41 (the area of the first adhesive placement portion 42 It is obtained by (total area/area of the first bonding region 41).
The area ratio of the second adhesive placement portion 46 is obtained by dividing the total area of the second adhesive placement portion 46 in the second bonding region 45 by the area of the second bonding region 45 (the total area of the second adhesive placement portion 46 area/area of the second bonding region 45).

Each of the area ratio of the first adhesive placement portion 42 and the area ratio of the second adhesive placement portion 46 can be measured, for example, by the following method.
First, from the superimposed region 48, a portion joined by the first joint region 41 or the second joint region 45 is cut out as a sample piece. Specifically, the first sheet 11 and the second sheet 12 joined at the first joining region 41 are cut out as a sample piece, or the second sheet 12 and the third sheet joined at the second joining region 45 are cut out as a sample piece. 13 is cut out as a sample piece. From the sample piece, constituent members that are not involved in the bonding of the adhesive placement portion to be measured are removed. For example, when measuring the area ratio of the first adhesive placement portion 42, the third sheet 13 is peeled off from the sample piece using a cold spray or the like. At this time, other constituent members are peeled off from the sample piece so as not to affect the adhesive state of the adhesive placement portion to be measured. The size of the sample piece shall be 50 mm×50 mm.
Next, by using a cold spray or the like, the sheets of the sample piece are peeled off to expose the surface on which the adhesive placement portion is formed, that is, the surface coated with the adhesive. The print toner is evenly spread on the surface coated with the adhesive, and after the print toner is adsorbed by the adhesive, the print toner not adsorbed by the adhesive is removed. Removal of print toner is performed by blowing air or by suction.
Next, a scanner (ES-10000G, Seiko Epson Corporation) is used to obtain an image of the surface on which the printing toner is adsorbed. The image is binarized to black and white, and is an image in which a portion to which the print toner is attracted and a portion to which the print toner is not attracted can be distinguished in black and white.
Next, using image analysis software (for example, Image-Pro Plus manufactured by Nippon Roper Co., Ltd.), the area ratio of the portion of the image to which the printing toner is adsorbed is measured. The measured value of such area ratio is converted into the area ratio of the adhesive placement portion on the sample piece based on the reference value measured in advance. The reference value is a value obtained by measuring the area ratio of the adhesive placement portion of the reference sample piece by the same method as described above. The reference sample piece is a sample piece (50 mm×50 mm) obtained by applying adhesive to a nonwoven fabric in a stripe pattern so that the area ratio of the adhesive placement portion is 50%. More specifically, in the reference sample piece, a coated portion coated with an adhesive and a non-coated portion not coated with an adhesive extend in one direction. The coated portions are alternately arranged in a direction orthogonal to the one direction. The width of each of the coated and non-coated portions of the reference sample piece is 1 mm, and the amount of adhesive applied to the coated portion is 3 g/m ² .

Each dimension such as the area of each of the first bonding region 41 and the second bonding region 45 and the width of each of the adhesive placement portions 42 and 46 and the adhesive non-placement portions 43 and 47 is the same as that of the adhesive placement portion unless otherwise specified. The measurement is performed with the backsheet 10 stretched in a direction orthogonal to the extending direction of 42 and 46 (vertical direction X in this embodiment) (see FIG. 3). That is, the measurement is performed in a state in which the folds in the first adhesive non-arrangement portion 43 and the folds in the second adhesive non-arrangement portion 47 are eliminated.

From the viewpoint of further improving the effects described above, the areas of the first bonding region 41 and the second bonding region 45 are preferably within the following ranges.
The ratio of the area of the superimposed region 48 to the area of the first bonding region 41 is preferably 30% or more, more preferably 40% or more, and preferably 90% or less, more preferably 80% or less. is 30% or more and 90% or less, more preferably 40% or more and 80% or less.
The ratio of the area of the superimposed region 48 to the area of the second bonding region 45 is preferably 20% or more, more preferably 30% or more, and preferably 80% or less, more preferably 70% or less. is 20% or more and 80% or less, more preferably 30% or more and 70% or less.

From the viewpoint of making it easier to form the pleated structure and further improving the texture of the backsheet 10, it is preferable that the width of the adhesive non-disposed portion of the first bonding region 41 is wider than that of the second bonding region 45. . That is, it is preferable that the first adhesive non-arranged portion 43 is wider than the second adhesive non-arranged portion 47 .
From the same viewpoint as above, the width W3 (see FIG. 4) of the first non-adhesive portion 43 is preferably 120% or more of the width W7 (see FIG. 4) of the second non-adhesive portion 47. It is more preferably 150% or more, more preferably 1000% or less, more preferably 500% or less, more preferably 120% or more and 1000% or less, more preferably 150% or more and 500% or less.

In this specification, the width of the adhesive placement portions 42, 46 or the adhesive non-placement portions 43, 47 is the width of the adhesive in the direction orthogonal to the extending direction of the adhesive placement portions 42, 46 and the adhesive non-placement portions 43, 47. It is the length of the agent placement portions 42 and 46 or the adhesive non-placement portions 43 and 47 . In this embodiment, the orthogonal direction coincides with the vertical direction X. As shown in FIG.

From the viewpoint of making the fold structure easier to move and further improving the feel of the backsheet 10, the width W6 (see FIG. 4) of the second adhesive placement portion 46 in the second bonding area 45 is set to the width of the first bonding area 41. is preferably equal to or less than the width W2 of the first adhesive placement portion 42 at .
From the same viewpoint as above, the width W6 (see FIG. 4) of the second adhesive placement portion 46 is preferably 20% or more, more preferably 20% or more, of the width W2 (see FIG. 4) of the first adhesive placement portion 42. is 30% or more, preferably 100% or less, more preferably 90% or less, more preferably 20% or more and 100% or less, more preferably 30% or more and 90% or less.

From the viewpoint of further improving the appearance of the outer surface of the diaper 1 , it is preferable that the width of the second adhesive placement portion 46 in the second bonding region 45 is narrower than the width of the second adhesive non-placement portion 47 . With such a configuration, wrinkles due to the joining of the second sheet 12 and the third sheet 13 become less conspicuous.
From the same viewpoint as above, the width W6 (see FIG. 4) of the second adhesive placement portion 46 is preferably 10% or more, more preferably 10% or more, of the width W7 (see FIG. 4) of the second adhesive non-placement portion 47. is 20% or more, preferably 90% or less, more preferably 70% or less, more preferably 10% or more and 90% or less, more preferably 20% or more and 70% or less.

From the viewpoint of more reliably exhibiting one or more of the above effects, the widths of the adhesive placement portions 42 and 46 and the adhesive non-placement portions 43 and 47 in the first bonding region 41 and the second bonding region 45 are set as follows. is preferably within the range of
The width W2 (see FIG. 4) of the first adhesive placement portion 42 is preferably 0.5 mm or more, more preferably 0.8 mm or more, and is preferably 5.0 mm or less, more preferably 3.0 mm or less. Yes, preferably 0.5 mm or more and 5.0 mm or less, more preferably 0.8 mm or more and 3.0 mm or less.
The width W3 (see FIG. 4) of the first adhesive non-arrangement portion 43 is preferably 1.0 mm or more, more preferably 1.5 mm or more, and is preferably 10.0 mm or less, more preferably 7.0 mm or less. and preferably 1.0 mm or more and 10.0 mm or less, more preferably 1.5 mm or more and 7.0 mm or less.
The width W6 (see FIG. 4) of the second adhesive placement portion 46 is preferably 0.5 mm or more, more preferably 0.8 mm or more, and is preferably 4.0 mm or less, more preferably 2.5 mm or less. Yes, preferably 0.5 mm or more and 4.0 mm or less, more preferably 0.8 mm or more and 2.5 mm or less.
The width W7 (see FIG. 4) of the second adhesive non-arrangement portion 47 is preferably 0.3 mm or more, more preferably 0.5 mm or more, and is preferably 8.0 mm or less, more preferably 5.0 mm or less. and preferably 0.3 mm or more and 8.0 mm or less, more preferably 0.5 mm or more and 5.0 mm or less.

In the diaper 1 of the present embodiment, the core elastic member 31 of the absorber 22, the cuff elastic members 35 of the leak-proof cuff 26, and the outer cuff elastic members 32 are each arranged so as to overlap the overlapping region 48 in plan view. (not shown). In addition, in the diaper 1, the leg elastic members 37 of the outer body 3 are positioned on both sides of the overlapping region 48 in the horizontal direction Y (not shown). Thus, in the diaper 1 in which the adhesive placement portions 42 and 46 extending in the lateral direction Y are intermittently arranged, the elastic members having stretchability in the longitudinal direction X are arranged so as to overlap the overlapping regions 48 in plan view. or arranged on both sides in the horizontal direction Y of the overlap region 48 . When the diaper 1 has such a structure, the contraction of the elastic members 31, 32, 35, and 37 facilitates the formation of the pleat structure, so that the cushioning and texture of the backsheet 10 can be further improved. In the diaper 1 having the above configuration, any one of the elastic members 31, 32, and 35 arranged so as to overlap the overlapped region 48 and the elastic members 37 arranged on both sides of the overlapped region 48 in the horizontal direction Y, respectively. It is preferable to have either one, and it is more preferable to have both.

When one or both of the elastic members 31, 32, and 35 arranged to overlap the overlapped region 48 and the elastic members 37 arranged on both sides of the overlapped region 48 in the horizontal direction Y in plan view are stretched, the Either the pleats in the first adhesive non-arranged portion 43 and the second adhesive non-arranged portion 47 disappear (see FIG. 4), or the height of each pleat decreases. On the other hand, when one or both of the elastic members 31, 32, and 35 arranged to overlap the overlapping region 48 and the elastic members 37 arranged on both sides of the overlapping region 48 in the horizontal direction Y are contracted, the first The height of each fold in the adhesive non-arrangement portion 43 and the second adhesive non-arrangement portion 47 is increased (see FIG. 5A). From the viewpoint of facilitating the formation of the pleated structure by contraction of the elastic member, at least one of the first joint region 41 and the second joint region 45 has a When the elastic member is stretched (see FIG. 4), it is preferable that the wide adhesive non-arrangement portions 43 and 47 are included rather than ]. In this case, the natural state (state in which no external force is applied) of the elastic members 31, 32, 35, 37 that stretch in the vertical direction is defined as "when the elastic members are contracted", and the diaper 1 is stretched to the maximum in the vertical direction X. The time when the elastic member is stretched is defined as "when the elastic member is stretched".

From the same point of view as above, it is preferable that the width of the adhesive non-arranged portions 43 and 47 when the elastic member is stretched or contracted is within the following range.
W is the width of the non-adhesive portions 43 and 47 when the elastic members are stretched, and W′ is the width of the non-adhesive portions 43 and 47 when the elastic members are contracted. ' ratio (W'/W) is preferably 20% or more, more preferably 30% or more, and is preferably 90% or less, more preferably 80% or less, and preferably 20% or more and 90% or less. , more preferably 30% or more and 80% or less. Specifically, such a ratio is the width of the first adhesive non-arranged portion 43 when the elastic member is contracted with respect to the width W3 of the first adhesive non-arranged portion 43 when the elastic member is stretched. The ratio of W3′ (W3′/W3), or the second adhesive non-arranged portion when the elastic member is contracted with respect to the width W7 of the second adhesive non-arranged portion 47 when the elastic member is stretched 47 width W7' ratio (W7'/W7).
The width W3′ of the first adhesive non-arranged portion 43 when the elastic member is contracted [see FIG. 5(a)] is preferably 0.5 mm or more, more preferably 1.0 mm or more. It is 8.0 mm or less, more preferably 6.0 mm or less, more preferably 0.5 mm or more and 8.0 mm or less, more preferably 1.0 mm or more and 5.0 mm or less.
The width W7' of the second non-adhesive portion 47 when the elastic member is shrunk (see FIG. 5A) is preferably 0.2 mm or more, more preferably 0.4 mm or more. It is 7.0 mm or less, more preferably 5.0 mm or less, more preferably 0.2 mm or more and 7.0 mm or less, more preferably 0.4 mm or more and 5.0 mm or less.

As described above, the first sheet 11 is a moisture-permeable film, and each of the second sheet 12 and the third sheet 13 is a fiber sheet made of a fiber material. From the viewpoint of facilitating the formation of the pleated structure, it is preferable that the constituent fibers of at least one of the second sheet 12 and the third sheet 13 are oriented in the lateral direction Y in the diaper 1 of the present embodiment. That is, at least one of the second sheet 12 and the third sheet 13 preferably has constituent fibers oriented in the extending direction of the adhesive placement portions 42 and 46 .

The orientation of the fibers in the sheet can be confirmed by the following method. First, the sheet to be measured is removed from the absorbent article by, for example, peeling it off using a cold spray or the like. Using a cutter or the like, the taken out sheet is cut into a rectangular shape with a length of 2 cm along the longitudinal direction X and a length of 2 cm along the lateral direction Y in plan view, and this is used as a measurement piece. A measurement piece is cut out from the overlapping region 48 of the second sheet 12 or the third sheet 13 . Then, using a microscope (for example, Digital Microscope VHX-1000 manufactured by Keyence Corporation), the measurement piece is observed at a magnification of 60 to 200 times. For each arbitrary fiber observed within a fixed observation area (for example, 1 mm square), two points are determined at which the length of the fiber is maximized within the area. Next, the angle formed by the straight line connecting the two ends and the horizontal direction Y is measured. This measurement is performed in at least three observation areas, and the arithmetic mean value (average angle) of the angles measured for a total of 30 or more fibers is obtained. If the average angle is within 45 degrees, it is determined that the constituent fibers are oriented in the transverse direction Y, and if the average angle exceeds 45 degrees, it is judged that the constituent fibers are oriented in the longitudinal direction X. In the above measurement, it is preferable to observe at a magnification that allows 10 or more fibers to be observed in the observation area.

From the standpoint of making the folds in the backsheet 10 easier to move, improving the softness of the backsheet 10, and improving the formability of the folds, at least one of the second sheet 12 and the third sheet 13 is: The ring crush compression strength when compressed in a direction orthogonal to the orientation direction of the constituent fibers (hereinafter also simply referred to as "ring crush compression strength") is preferably 1.0 cN or more, more preferably 1.5 cN or more. It is preferably 7.0 cN or less, more preferably 5.0 cN or less, more preferably 1.0 cN or more and 7.0 cN or less, more preferably 1.5 cN or more and 5.0 cN or less.

The ring crush compression strength can be measured as follows. First, the sheet to be measured is removed from the absorbent article by, for example, peeling it off using a cold spray or the like. From the sheet taken out, five rectangular pieces having a length of 80 mm along the orientation direction of the constituent fibers of the sheet and a length of 30 mm along the direction orthogonal to the orientation direction are cut out and used as test pieces. Each test piece is rolled into a cylindrical shape in the longitudinal direction of the test piece, one end and the other end in the longitudinal direction of the test piece are overlapped by 10 mm to make a cylinder with an outer circumference of 70 mm, and the upper end ( The upper end in the axial direction of the cylinder) and the lower end are stapled (for example, Max Co., Ltd., No. 2). 10-1M needle] to obtain five cylindrical measurement samples. The orientation of the staples should be parallel to the circumferential direction of the measurement sample. Each measurement sample obtained (initial sample width: 30 mm) is set in a Tensilon compression tester (“RTA-100” manufactured by Orientec Co., Ltd.), and is compressed by a circular compression plate with a diameter of 70 mm or more in the axial direction of the cylinder ( The maximum load (cN) exhibited when the test piece is compressed at a compression rate of 10 mm/min in the width direction) is measured. Five measurement samples are similarly measured, and the arithmetic mean value thereof is taken as the ring crush compressive strength of the sheet. The measurement environment is a room temperature of 23±2° C. and a relative humidity of 50% RH±5%.

From the viewpoint of making the folds of the back sheet 10 easier to move and further improving the touch, the third sheet 13 has a higher ring crush compression strength than the second sheet 12 when compressed in a direction perpendicular to the orientation direction of the constituent fibers. It is preferable that the thickness is small.
From the same point of view as above, the ring crush compressive strength of each of the first sheet 11, the second sheet 12 and the third sheet is preferably within the following range.
The ring crush compressive strength of the first sheet 11 is preferably 1.0 cN or more, more preferably 1.5 cN or more, and preferably 7.0 cN or less, more preferably 5.0 cN or less, and preferably It is 1.0 cN or more and 7.0 cN or less, more preferably 1.5 cN or more and 5.0 cN or less.
The ring crush compression strength of the second sheet 12 is preferably 1.0 cN or more, more preferably 1.5 cN or more, and preferably 7.0 cN or less, more preferably 5.0 cN or less, and preferably It is 1.0 cN or more and 7.0 cN or less, more preferably 1.5 cN or more and 5.0 cN or less.
The ring crush compression strength of the third sheet 13 is preferably 0.5 cN or more, more preferably 1.0 cN or more, and preferably 6.0 cN or less, more preferably 4.0 cN or less, and preferably It is 0.5 cN or more and 6.0 cN or less, more preferably 1.0 cN or more and 4.0 cN or less.

From the viewpoint of facilitating the movement of folds in the backsheet 10 and further improving the touch, it is preferable that the third sheet have a lower basis weight than the second sheet.
From the same viewpoint as above, the basis weights of the first sheet 11, the second sheet 12 and the third sheet 13 are preferably within the following ranges.
The basis weight of the first sheet 11 is preferably 5 g/m ² or more, more preferably 8 g/m ² or more, and preferably 40 g/m ² or less, more preferably 30 g/m ² or less. is 5 g/m ² or more and 40 g/m ² or less, more preferably 8 g/m ² or more and 30 g/m ² or less.
The basis weight of the second sheet 12 is preferably 5 g/m ² or more, more preferably 8 g/m ² or more, and preferably 30 g/m ² or less, more preferably 20 g/m ² or less. is 5 g/m ² or more and 30 g/m ² or less, more preferably 8 g/m ² or more and 20 g/m ² or less.
The basis weight of the third sheet 13 is preferably 5 g/m ² or more, more preferably 8 g/m ² or more, and preferably 25 g/m ² or less, more preferably 20 g/m ² or less. is 5 g/m ² or more and 25 g/m ² or less, more preferably 8 g/m ² or more and 20 g/m ² or less.

The third sheet 13 preferably has a lower density than the second sheet 12 from the viewpoint of making the folds of the back sheet 10 easy to move and further improving the touch. The density of each sheet is calculated by dividing the basis weight by the thickness of the sheet. The thickness of the sheet is the thickness of the sheet under a load of 0.05 kPa. For thickness measurement, for example, a non-contact laser displacement meter or the like can be used.
From the same viewpoint as above, the basis weights of the first sheet 11, the second sheet 12 and the third sheet 13 are preferably within the following ranges.
The density of the first sheet 11 is preferably 30×10 ⁻⁶ g/mm ³ or more, more preferably 50×10 ⁻⁶ g/mm ³ or more, and preferably 300×10 ⁻⁶ g/mm ³ or less. , more preferably 200×10 ⁻⁶ g/mm ³ or less, more preferably 30×10 ⁻⁶ g/mm ³ or more and 300×10 ⁻⁶ g/mm ³ or less, more preferably 50×10 ⁻⁶ g/mm 3 /mm ³ or more and 200×10 ⁻⁶ g/mm ³ or less.
The density of the second sheet 12 is preferably 30×10 ⁻⁶ g/mm ³ or more, more preferably 50×10 ⁻⁶ g/mm ³ or more, and preferably 200×10 ⁻⁶ g/mm ³ or less. , more preferably 150 g/mm ³ or less, more preferably 30 g/mm ³ or more and 200×10 ⁻⁶ g/mm ³ or less, more preferably 50×10 ⁻⁶ g/mm ³ or more and 150×10 ⁻⁶ g / mm ³ or less.
The density of the third sheet 13 is preferably 30×10 ⁻⁶ g/mm ³ or more, more preferably 50×10 ⁻⁶ g/mm ³ or more, and preferably 180×10 ⁻⁶ g/mm ³ or less. , more preferably 150×10 ⁻⁶ g/mm ³ or less, more preferably 30×10 ⁻⁶ g/mm ³ or more and 180×10 ⁻⁶ g/mm ³ or less, more preferably 50×10 ⁻⁶ g/mm 3 /mm ³ or more and 150×10 ⁻⁶ g/mm ³ or less.

When forming the first bonding area 41, the non-skin-facing surface of the first sheet 11 or the skin-facing surface of the second sheet 12 may be coated with an adhesive. When forming the second bonding region 45 , an adhesive may be applied to the non-skin-facing surface of the second sheet 12 or the skin-facing surface of the third sheet 13 . A water-insoluble adhesive can be used. Examples of water-insoluble adhesives include those made of hydrophobic thermoplastic resins, such as styrene-ethylene-butylene-styrene (SEBS), styrene-isoprene-styrene (SIS), and styrene-butylene-styrene. (SBS), styrene-ethylene-propylene-styrene (SEPS), ethylene vinyl acetate (EVA), polyvinyl alcohol (PVA) and other hot melt adhesives. As the adhesive, one of the components described above can be used alone or in combination of two or more.

As the adhesive coating pattern, an intermittent pattern in which the adhesive is not applied can be employed without particular limitation. For example, the coating pattern of the adhesive may be stripes extending in one direction [see FIG. 6(a)], or may be spiral [see FIG. 6(b)]. Also, the adhesive placement portions 42 and 46 may have a wavy line shape [see FIG. 6(c)], or may be an aggregate of a plurality of dots extending in one direction (not shown).
From the viewpoint of more easily satisfying the size relationship of the area ratios of the first bonding region 41 and the second bonding region 45 (the first bonding region 41 < the second bonding region 45), the first adhesive placement portion 42 and the second bonding region 45 It is preferable that the coating width of the adhesive forming the adhesive placement portion 46 is the same [see FIGS. 6(a) to 6(c)]. In such a form, the arrangement pitch of the adhesive placement portions in the direction orthogonal to the extending direction of the adhesive placement portions is made different between the first bonding region 41 and the second bonding region 45 .

The basis weight (application amount per unit area) of the adhesive in each of the first adhesive placement portion 42 and the second adhesive placement portion 46 may be the same or different.
From the viewpoint of ensuring the bonding strength between the absorbent main body 2 and the exterior body 3 more reliably, the basis weight of the adhesive in the first adhesive placement portion 42 is preferably 1.0 g/m ² or more, more preferably 2 g/m 2 or more. 0 g/m ² or more, preferably 15.0 g/m ² or less, more preferably 10.0 g/m ² or less, and more preferably 1.0 g/m ² or more and 15.0 g/m ² or less , more preferably 2.0 g/m ² or more and 10.0 g/m ² or less.
From the viewpoint of more reliably ensuring the bonding strength between the second sheet 12 and the third sheet 13 and between these sheets and the leg elastic member 37, the basis weight of the adhesive in the second adhesive placement portion 46 is preferably 1.0 g/m ² or more, more preferably 2.0 g/m ² or more, and preferably 15.0 g/m ² or less, more preferably 10.0 g/m ² or less, and preferably 1.0 g/m 2 or more. It is 0 g/m ² or more and 15.0 g/m ² or less, more preferably 2.0 g/m ² or more and 10.0 g/m ² or less.

Further, the basis weight of the adhesive forming the individual adhesive placement portions 42 and 46 in the first bonding area 41 or the second bonding area 45 may be the same or different.

The material forming each part of the diaper 1 in the embodiment described above will be described in detail. As the surface sheet 21 and the absorbent body 22, those conventionally used in absorbent articles can be used without particular limitation.
As the surface sheet 21, for example, a liquid-permeable nonwoven fabric, a perforated film, or the like can be used.
As the absorbent core 24 of the absorbent body 22, an aggregate of hydrophilic fibers such as wood pulp and hydrophilized synthetic fibers, or an aggregate holding a water-absorbing polymer can be used. As the core wrap sheet 25, the same material as the surface sheet 21 can be used.

When the first sheet 11 of the backsheet 10 is the leak-proof sheet 28, the first sheet 11 may be a liquid-impermeable or water-repellent sheet. As such a sheet, a resin film, a laminate of a resin film and a nonwoven fabric, or the like can be used. Examples of resin films include films made of polymeric materials such as polyethylene terephthalate, polyester, polyethylene, polypropylene, cellophane, nylon, polyvinyl alcohol, polyvinyl chloride, and polycarbonate, and moisture-permeable films.
When the second sheet 12 and the third sheet 13 of the back sheet 10 are the exterior body 3, the second sheet 12 and the third sheet 13 can be made of nonwoven fabrics manufactured by various methods, for example, spunbonded nonwoven fabrics, air-through Nonwoven fabrics, spunlace nonwoven fabrics, heat roll nonwoven fabrics, meltblown nonwoven fabrics, laminated nonwoven fabrics of these, and the like can be used.

At least one of the second sheet 12 and the third sheet 13 preferably has a fiber layer containing crimped fibers from the viewpoint of further improving the cushioning feeling and softness of the backsheet 10 . For example, at least one of the second sheet 12 and the third sheet 13 may be a laminated nonwoven fabric having a fiber layer containing crimped fibers. From the same viewpoint as above, it is preferable that the non-skin facing surface of the third sheet 13 is formed of a fiber layer containing crimped fibers.
As crimped fibers, there are mechanically crimped fibers that are two-dimensionally crimped in a zigzag shape by mechanical crimping, three-dimensionally crimped fibers that are spirally crimped three-dimensionally, and three-dimensionally coiled by applying heat. Latent crimped fibers or the like can be used. Examples of crimped fibers include those composed of eccentric core-sheath or side-by-side type conjugate fibers composed of two types of thermoplastic polymer materials having different shrinkage rates. More specifically, those described in JP-A-9-296325, Japanese Patent No. 2759331, and Japanese Patent No. 5404967 can be mentioned.

The third sheet 13 is made of non-skin material from the viewpoint of making the fibers move more easily when touched by a finger or the like, further improving the smoothness and cushion feeling, and more reliably ensuring the bonding strength in the second bonding region 45. Preferably, the fiber layer forming the facing surface contains crimped fibers, and the fiber layer forming the skin facing surface does not contain the crimped fibers. As such a form, the third sheet 13 may be made of a laminated nonwoven fabric in which a fiber layer containing crimped fibers and a fiber layer not containing crimped fibers are laminated.

When at least one of the second sheet 12 and the third sheet 13 has a fiber layer containing crimped fibers, from the same viewpoint as above, the content ratio of the crimped fibers in the fiber layer containing crimped fibers is preferably 10% by mass or more, more preferably 20% by mass or more, and preferably 100% by mass or less, more preferably 80% by mass or less, relative to the total mass of the fibers in the fiber layer, and It is preferably 10% by mass or more and 100% by mass or less, more preferably 20% by mass or more and 80% by mass or less.

Elastic members such as the core elastic member 31 in the absorbent body 22, the cuff elastic member 35 in the leak-proof cuff 16, the outer cuff elastic member 32, and the leg elastic member 37 may be any of various known elastic members commonly used in this type of absorbent article. Materials can be used without particular limitations. Examples of elastic materials include synthetic rubbers such as styrene-butadiene, butadiene, isoprene and neoprene, natural rubbers, EVA, elastic polyolefins, and polyurethanes. As for the shape of the elastic member, it is preferable to use a thread-like (string rubber, etc.) or string-like (flat rubber, etc.) having a rectangular, square, circular, polygonal cross section, etc., or a multi-filament type thread-like one. can.

Although the present invention has been described above based on its preferred embodiments, the present invention is not limited to the above-described embodiments.
For example, the absorbent article described above was a pants-type disposable diaper, but it may be a spread-type disposable diaper, for infants, or for adults.
In the above-described embodiment, the extending directions of the first adhesive placement portion 42 and the second adhesive placement portion 46 match the horizontal direction Y, but even if the extending direction matches the vertical direction X, good.
In the embodiment described above, the absorbent core 24 has the bending guide portions 23C and 23S, but it may not have the bending guide portions 23C and 23S. Also, the entire absorbent core 24 may have a two-layer structure, or may have a single-layer structure. Furthermore, the absorbent core 24 may not have the core elastic member 31 .
In the above-described embodiment, the leak-proof cuff 26 has the outer cuff elastic member 32, but the outer cuff elastic member 32 may not be provided.

Also, for example, the exterior body 3 shown in FIG. It is divided into a dorsal sheet member arranged on the side and a ventral sheet member arranged on the ventral side, and the dorsal sheet member and the ventral sheet member are joined by a pair of side seal portions to form a tubular shape. In addition, the absorbent main body may be of a divided outer body type in which the absorbent main body is fixed by spanning between the dorsal sheet member and the ventral sheet member.
In addition, in the embodiment described above, the exterior body 3 has a two-layer structure of the second sheet 12 and the third sheet 13, but the exterior body 3 may have a single-layer structure. In that case, the sheet constituting the outer body 3 is the third sheet 13, and the two sheets positioned between the third sheet 13 and the absorbent core 24 in the thickness direction of the diaper 1 are the first sheet 11 and the absorbent core 24. It becomes the second seat 12 . As such a form, for example, the absorbent body 22 includes an absorbent core 24, a skin-side core wrap sheet that covers the skin-facing surface of the absorbent core 24, and a non-skin-facing surface that covers the non-skin facing surface of the absorbent core 24. A form comprising a skin-side core wrap sheet, and a form comprising a non-skin-side core wrap sheet, a moisture-permeable film sheet, and a nonwoven fabric in this order on the non-skin facing side of the absorbent core 24. . In this case, the non-skin side core wrap sheet is the first sheet 11, the moisture-permeable film sheet is the second sheet 12, and the nonwoven fabric is the third sheet 13.

Further, the following absorbent article is disclosed in relation to the embodiment of the present invention described above.
<1>
An absorbent comprising a topsheet, a backsheet, and an absorbent core disposed between the topsheet and the backsheet, and having a longitudinal direction corresponding to the front-rear direction of the wearer and a lateral direction perpendicular to the longitudinal direction. is a sexual article,
The backsheet has a first sheet, a second sheet, and a third sheet in order from the skin-facing side toward the non-skin-facing side,
The third sheet forms a non-skin facing surface of the absorbent article,
a first joint region in which the first sheet and the second sheet are joined with an adhesive; and a second joint region in which the second sheet and the third sheet are joined with an adhesive. and the first bonding region and the second bonding region at least partially overlap in plan view,
Each of the first bonding region and the second bonding region has an adhesive placement portion in which the adhesive is placed and an adhesive non-placement portion in which the adhesive is not placed,
The absorbent article, wherein the first joint region has a lower area ratio of the adhesive placement portion than the second joint region.

<2>
A ratio of the area ratio of the adhesive placement portion in the first bonding region to the area ratio of the adhesive placement portion in the second bonding region is 0.2 or more and 0.9 or less, preferably 0.3 or more and 0.9. 7 or less, the absorbent article according to <1>.
<3>
The absorbent article according to <2> above, wherein the area ratio of the adhesive placement portion in the first joint region is 10% or more and 50% or less, more preferably 12% or more and 25% or less.
<4>
The absorbent article according to <2> or <3> above, wherein the area ratio of the adhesive placement portion in the second joint region is 12% or more and 50% or less, more preferably 15% or more and 35% or less.
<5>
In the first bonding region and the second bonding region, the adhesive placement portions and the adhesive non-placement portions are alternately arranged in the vertical direction and are formed to extend in the horizontal direction,
The absorbent article according to any one of <1> to <4>, wherein the width of the non-adhesive portion of the first joint region is wider than that of the second joint region.
<6>
A ratio of the width of the non-adhesive portion in the first bonding region to the width of the non-adhesive portion in the second bonding region is 120% or more and 1000% or less, preferably 150% or more and 500% or less. , the absorbent article according to <5>.
<7>
The absorbent article according to <6>, wherein the adhesive-disposed portion in the second joint region has a width narrower than the adhesive-non-disposed portion.
<8>
The absorption according to <7> above, wherein the ratio of the width of the adhesive placement portion to the adhesive non-placement portion in the second bonding region is 10% or more and 90% or less, preferably 20% or more and 70% or less. sexual goods.
<9>
The absorbent article according to any one of <5> to <8>, wherein the width of the adhesive placement portion of the second joint region is equal to or less than the width of the adhesive placement portion of the first joint region. .
<10>
The ratio of the width of the adhesive placement portion of the second bonding region to the width of the adhesive placement portion of the first bonding region is 20% or more and 100% or less, preferably 30% or more and 90% or less. The absorbent article according to <9>.

<11>
When the region where the first bonding region and the second bonding region overlap in plan view is defined as an overlapping region,
Any one of <1> to <10> above, wherein the ratio of the area of the overlapping region to the area of the first bonding region is 30% or more and 90% or less, preferably 40% or more and 80% or less. absorbent article.
<12>
When the region where the first bonding region and the second bonding region overlap in plan view is defined as an overlapping region,
Any one of <1> to <11> above, wherein the ratio of the area of the overlapping region to the area of the second bonding region is 20% or more and 80% or less, preferably 30% or more and 70% or less. absorbent article.
<13>
When the region where the first bonding region and the second bonding region overlap in plan view is defined as an overlapping region,
The elastic member having stretchability in the longitudinal direction is arranged so as to overlap with the overlapping area in a plan view, or arranged on both sides of the overlapping area in the horizontal direction,
At least one of the first bonding region and the second bonding region includes the non-adhesive portion that is wider when the elastic member is stretched than when the elastic member is contracted. The absorbent article according to any one of <5> to <12> above.
<14>
Assuming that the width of the adhesive non-arranged portion when the elastic member is stretched is W, and the width of the adhesive non-arranged portion is W' when the elastic member is contracted, W' relative to W is The absorbent article according to <13> above, wherein the ratio (W'/W) is 20% or more and 90% or less, preferably 30% or more and 80% or less.
<15>
At least one of the second sheet and the third sheet has constituent fibers oriented in the lateral direction, and preferably has a ring crush compressive strength of 7.0 cN or less when compressed in a direction orthogonal to the orientation direction. is 1.0 cN or more and 7.0 cN or less, more preferably 1.5 cN or more and 5.0 cN or less.
<16>
The absorbent article according to <15>, wherein the third sheet has a lower ring crush compressive strength than the second sheet.
<17>
The absorbent article according to <15> or <16> above, wherein the ring crush compression strength of the first sheet is 1.0 cN or more and 7.0 cN or less, preferably 1.5 cN or more and 5.0 cN or less.
<18>
Any one of <15> to <17> above, wherein the ring crush compression strength of the second sheet is 1.0 cN or more and 7.0 cN or less, preferably 1.5 cN or more and 5.0 cN or less. absorbent article.
<19>
Any one of <15> to <18> above, wherein the ring crush compression strength of the third sheet is 0.5 cN or more and 6.0 cN or less, preferably 1.0 cN or more and 4.0 cN or less. absorbent article.
<20>
The absorbent article according to any one of <1> to <19>, wherein the third sheet has a basis weight lower than that of the second sheet.

<21>
The absorbent article according to <20> above, wherein the basis weight of the first sheet is 5 g/m ² or more and 40 g/m ² or less, preferably 8 g/m ² or more and 30 g/m ² or less.
<22>
The absorbent article according to <20> or <21> above, wherein the second sheet has a basis weight of 5 g/m ² or more and 30 g/m ² or less, preferably 8 g/m ² or more and 20 g/m ² or less.
<23>
Any one of <20> to <22> above, wherein the basis weight of the third sheet is 5 g/m ² or more and 25 g/m ² or less, preferably 8 g/m ² or more and 20 g/m ² or less. absorbent article.
<24>
The absorbent article according to any one of <20> to <23>, wherein the third sheet has a lower density than the second sheet.
<25>
The density of the first sheet is 30×10 ⁻⁶ g/mm ³ or more and 300×10 ⁻⁶ g/mm ³ or less, preferably 50×10 ⁻⁶ g/mm ³ or more and 200×10 ⁻⁶ g/mm ³ or more. The absorbent article according to <24> above, which is the following.
<26>
The density of the second sheet is 30×10 ⁻⁶ g/mm ³ or more and 200×10 ⁻⁶ g/mm ³ or less, preferably 50×10 ⁻⁶ g/mm ³ or more and 150×10 ⁻⁶ g/mm ³ or more. The absorbent article according to <24> or <25> below.
<27>
The density of the third sheet is 30×10 ⁻⁶ g/mm ³ or more and 180×10 ⁻⁶ g/mm ³ or less, preferably 50×10 ⁻⁶ g/mm ³ or more and 150×10 ⁻⁶ g/mm ³ or more. The absorbent article according to any one of <24> to <26>, wherein:
<28>
The absorbent article according to any one of <1> to <27>, wherein at least one of the second sheet and the third sheet has a fiber layer containing crimped fibers.
<29>
The content of the crimped fibers in the fiber layer containing the crimped fibers is 10% by mass or more and 100% by mass or less, preferably 20% by mass or more and 80% by mass or less with respect to the total mass of the fibers in the fiber layer. The absorbent article according to <28> above.
<30>
In the third sheet, the fiber layer forming the non-skin facing surface contains crimped fibers, and the fiber layer forming the skin facing surface does not contain the crimped fibers, the <28> or <29 > Absorbent article according to.

According to the absorbent article of the present invention, it is possible to achieve both good appearance and good touch.

Claims (30)

1. An absorbent comprising a topsheet, a backsheet, and an absorbent core disposed between the topsheet and the backsheet, and having a longitudinal direction corresponding to the front-rear direction of the wearer and a lateral direction perpendicular to the longitudinal direction. is a sexual article,
   The backsheet has a first sheet, a second sheet, and a third sheet in order from the skin-facing side toward the non-skin-facing side,
   The third sheet forms a non-skin facing surface of the absorbent article,
   a first joint region in which the first sheet and the second sheet are joined with an adhesive; and a second joint region in which the second sheet and the third sheet are joined with an adhesive. and the first bonding region and the second bonding region at least partially overlap in plan view,
   Each of the first bonding region and the second bonding region has an adhesive placement portion in which the adhesive is placed and an adhesive non-placement portion in which the adhesive is not placed,
   The absorbent article, wherein the first joint region has a lower area ratio of the adhesive placement portion than the second joint region.
2. 2. The method according to claim 1, wherein a ratio of the area ratio of the adhesive placement portion in the first bonding region to the area ratio of the adhesive placement portion in the second bonding region is 0.2 or more and 0.9 or less. absorbent article.
3. The absorbent article according to claim 2, wherein the area ratio of the adhesive placement portion in the first joint region is 10% or more and 50% or less.
4. The absorbent article according to claim 2 or 3, wherein the area ratio of the adhesive placement portion in the second joint region is 12% or more and 50% or less.
5. In the first bonding region and the second bonding region, the adhesive placement portions and the adhesive non-placement portions are alternately arranged in the vertical direction and are formed to extend in the horizontal direction,
   5. The absorbent article according to any one of claims 1 to 4, wherein the width of the adhesive-free portion of the first joint region is wider than that of the second joint region.
6. 6. The absorbent article according to claim 5, wherein the ratio of the width of said non-adhesive portion in said first joint region to the width of said non-adhesive portion in said second joint region is 120% or more and 1000% or less. .
7. The absorbent article according to claim 6, wherein the width of the adhesive placement portion in the second joint region is narrower than the width of the adhesive non-placement portion.
8. The absorbent article according to claim 7, wherein the ratio of the width of said adhesive-disposed portion to said non-adhesive-disposed portion in said second joint region is 10% or more and 90% or less.
9. The absorbent article according to any one of claims 5 to 8, wherein the width of the adhesive placement portion of the second joint region is equal to or less than the width of the adhesive placement portion of the first joint region.
10. The absorbent article according to claim 9, wherein the ratio of the width of the adhesive placement portion of the second joining region to the width of the adhesive placement portion of the first joining region is 20% or more and 100% or less.
11. When the region where the first bonding region and the second bonding region overlap in plan view is defined as an overlapping region,
    11. The absorbent article according to any one of claims 1 to 10, wherein the ratio of the area of said overlapping region to the area of said first joint region is 30% or more and 90% or less.
12. When the region where the first bonding region and the second bonding region overlap in plan view is defined as an overlapping region,
    The absorbent article according to any one of claims 1 to 11, wherein the ratio of the area of said overlapping region to the area of said second bonding region is 20% or more and 80% or less.
13. When the region where the first bonding region and the second bonding region overlap in plan view is defined as an overlapping region,
    The elastic member having stretchability in the longitudinal direction is arranged so as to overlap with the overlapping area in a plan view, or arranged on both sides of the overlapping area in the horizontal direction,
    At least one of the first bonding region and the second bonding region includes the non-adhesive portion that is wider when the elastic member is stretched than when the elastic member is contracted. The absorbent article according to any one of claims 5 to 12.
14. Assuming that the width of the adhesive non-arranged portion when the elastic member is stretched is W, and the width of the adhesive non-arranged portion is W' when the elastic member is contracted, W' relative to W is 14. The absorbent article according to claim 13, wherein the ratio (W'/W) is 20% or more and 90% or less.
15. At least one of the second sheet and the third sheet has constituent fibers oriented in the lateral direction, and has a ring crush compressive strength of 7.0 cN or less when compressed in a direction orthogonal to the orientation direction. , The absorbent article according to any one of claims 1 to 14.
16. 16. The absorbent article according to claim 15, wherein the third sheet has a lower ring crush compressive strength than the second sheet.
17. The absorbent article according to claim 15 or 16, wherein the ring crush compression strength of the first sheet is 1.0 cN or more and 7.0 cN or less.
18. The absorbent article according to any one of claims 15 to 17, wherein the ring crush compression strength of the second sheet is 1.0 cN or more and 7.0 cN or less.
19. The absorbent article according to any one of claims 15 to 18, wherein the ring crush compression strength of the third sheet is 0.5 cN or more and 6.0 cN or less.
20. The absorbent article according to any one of claims 1 to 19, wherein the third sheet has a lower basis weight than the second sheet.
21. The absorbent article according to Claim 20, wherein the basis weight of the first sheet is 5 g/ ^m2 or more and 40 g/ ^m2 or less.
22. The absorbent article according to claim 20 or 21, wherein the second sheet has a basis weight of 5 g/m ² or more and 30 g/m ² or less.
23. The absorbent article according to any one of claims 20 to 22, wherein the third sheet has a basis weight of 5 g/m ² or more and 25 g/m ² or less.
24. The absorbent article according to any one of claims 20 to 23, wherein the third sheet has a lower density than the second sheet.
25. 25. The absorbent article according to claim 24, wherein the first sheet has a density of 30×10 ⁻⁶ g/mm ³ or more and 300×10 ⁻⁶ g/mm ³ or less.
26. The absorbent article according to claim 24 or 25, wherein the second sheet has a density of 30 x 10 ^-6 g/mm ³ or more and 200 x 10 ^-6 g/mm ³ or less.
27. The absorbent article according to any one of claims 24 to 26, wherein the third sheet has a density of 30 × 10 ^-6 g/mm ³ or more and 180 × 10 ^-6 g/mm ³ or less.
28. The absorbent article according to any one of claims 1 to 27, wherein at least one of the second sheet and the third sheet has a fiber layer containing crimped fibers.
29. 29. The absorbent article according to claim 28, wherein the content of crimped fibers in the fiber layer containing crimped fibers is 10% by mass or more and 100% by mass or less with respect to the total mass of fibers in the fiber layer. .
30. 30. The third sheet according to claim 28 or 29, wherein the fiber layer forming the non-skin facing surface contains crimped fibers, and the fiber layer forming the skin facing surface does not contain the crimped fibers. absorbent article.
    

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