CN114305877A - Absorbent article - Google Patents

Abstract

The invention provides an absorbent article. The object to be attached to the outer body of the absorbent article using the hydrophilic nonwoven fabric is less likely to peel off. The absorbent article (1) has an absorbent main body (10) and an exterior member (20) provided on the non-skin side of the absorbent main body (10), wherein the exterior member (20) has a hydrophilic nonwoven fabric (42) containing a hydrophilic oil agent on the non-skin side, an adhesive article (80) to which an adhesive agent is adhered is provided on the non-skin side surface of the hydrophilic nonwoven fabric (42), and the hydrophilic nonwoven fabric (42) has fibers (42f) having a fiber length longer than the smaller one of the dimensions of the adhesive article (80) in the longitudinal direction and in the transverse direction orthogonal to the longitudinal direction.

Description

Absorbent article

Technical Field

The present invention relates to an absorbent article.

Background

Conventionally, there has been known a pants-type diaper using a hydrophilic nonwoven fabric in which hydrophilicity is improved by containing a hydrophilic oil agent. For example, patent document 1 discloses a technique relating to a disposable diaper using a hydrophilic nonwoven fabric having fibers hydrophilized by a method such as treatment of hydrophobic synthetic fibers with a hydrophilizing agent, as an exterior sheet 4 constituting an exterior body 3 of a diaper 1.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2017-113186

Disclosure of Invention

Problems to be solved by the invention

A material to be attached such as a so-called post-treatment tape or a front and rear display tape may be attached to the surface of the outer package of the disposable diaper using an adhesive. However, in the diaper as in patent document 1, there is a possibility that the stuck material is easily peeled off from the surface of the outer package due to the influence of an oil agent (hydrophilizing agent) for hydrophilizing the hydrophilic nonwoven fabric. Further, when the diaper is stretched to unfold the post-treatment tape (sticker) after use, the bonding of the fibers constituting the hydrophilic nonwoven fabric is cut, and the nonwoven fabric may be partially broken to peel the sticker from the outer package.

The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to make it difficult for an adherend to be peeled off, the adherend being adhered to an exterior body of an absorbent article using a hydrophilic nonwoven fabric.

Means for solving the problems

The main invention for achieving the above object is an absorbent article having a liquid-absorbent main body and an exterior member provided on a non-skin side of the absorbent main body, wherein the exterior member has a hydrophilic nonwoven fabric containing a hydrophilic oil agent on the non-skin side, and a patch to which an adhesive is applied is provided on a surface of the hydrophilic nonwoven fabric on the non-skin side, and the hydrophilic nonwoven fabric has fibers having a fiber length longer than a smaller one of a longitudinal dimension and a transverse dimension of the patch.

Other features of the present invention will be apparent from the description of the present specification and the accompanying drawings.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, the adherend to be adhered to the outer cover of the absorbent article using the hydrophilic nonwoven fabric can be made less likely to peel off.

Drawings

Fig. 1 is a schematic perspective view of a diaper 1.

Fig. 2 is a plan view of the diaper 1 in an unfolded and extended state.

Fig. 3 is a schematic sectional view taken along line a-a of fig. 2.

Fig. 4A is a plan view of the absorbent main body 10, and fig. 4B is a schematic sectional view of the absorbent main body 10.

Fig. 5 is a schematic cross-sectional view showing the aftertreatment belt 80 provided on the non-skin-side surface of the rear waist portion 40.

Fig. 6A is a schematic perspective view of the diaper 1 in a state where the aftertreatment belt 80 is developed, as viewed from the back side. Fig. 6B is a schematic perspective view showing a state in which the diaper 1 in the state of fig. 6A is rolled up and disposed of.

Fig. 7A to 7C are views for explaining the basic principle when moisture is absorbed and transpired in the diaper 1.

Fig. 8A and 8B are views for explaining a factor of detachment of the finishing tape 80 in the finishing operation of the diaper 1.

Fig. 9 is a diagram illustrating the relationship between the fibers constituting the non-skin side sheet 42 (hydrophilic nonwoven fabric) of the diaper 1 and the post-treatment belt 80.

Fig. 10 is a schematic cross-sectional view showing a modification of the post-treatment belt 80.

Fig. 11A and 11B are diagrams illustrating forces acting on the post-processing belt 80 of the modification when performing the post-processing operation.

Fig. 12 is a view for explaining a state of a surface of a portion of the non-skin side sheet 42 to which the aftertreatment tape 80 is attached.

Fig. 13A and 13B are views for explaining a method of attaching the waist elastic member 35 to the front waist portion 30 using the welded portion 60.

Fig. 14A is a plan view of the diaper 2 in an unfolded and extended state. Fig. 14B is a schematic sectional view taken along line D-D of fig. 14A.

Fig. 15A is a plan view of the diaper 3 in an unfolded and extended state. Fig. 15B is a schematic sectional view taken along line E-E of fig. 15A.

Fig. 16A is a plan view of the diaper 4 in an unfolded and extended state. Fig. 16B is a schematic sectional view taken along line F-F of fig. 16A.

Description of the reference numerals

1. Diapers (absorbent articles, pants-type diapers) (embodiment 1); 2. diapers (absorbent articles, pants-type diapers) (embodiment 2); 3. diapers (absorbent articles, pants-type diapers) (embodiment 3); 4. diapers (absorbent articles, tape-type diapers) (embodiment 4); 10. an absorbent body 11, an absorbent core; 11b, a core cladding sheet; 11c, a narrowing; 12. a top sheet; 13. a bottom sheet; 13a, a liquid-impermeable sheet (breathable film); 13b, an exterior sheet; 15. a leakage preventing wall portion; 16. a leakage preventing wall elastic member; 17. a leg elastic member; 18. a side panel; 19. a back-side elastic member; 20. a waist member; 21. a skin side sheet (hydrophobic nonwoven fabric); 22. a non-skin side sheet (hydrophilic nonwoven fabric); 25. an exterior sheet (hydrophilic nonwoven fabric); 26. a hook and loop fastener; 26f, surface fastener; 27. a target sheet; 30. a front waist portion; 30sw, side; 31. a skin side sheet (hydrophobic nonwoven fabric); 32. a non-skin side sheet (hydrophilic nonwoven fabric); 32f, a folded-back portion; 32h, an opening part; 35. a waist elastic member; 36. a skin patch; 40. a rear waist portion; 40b, a hip cover; 40sw, lateral; 41. a skin side sheet (hydrophobic nonwoven fabric); 42. a non-skin side sheet (hydrophilic nonwoven fabric); 42f, a folded-back portion; 42e, a compression part; 42h, a hole opening part; 45. a waist elastic member; 46. a skin patch; 47. a bending elastic member; 50. a side engaging portion; 60. a fusion part; 60s, welding part pair; 80. post-treatment tape (sticker); 80e, one end; 80f, the other end; 81. a belt main body; 81x, layer 1; 81y, layer 2; 81z, layer 3; 82. a belt holding portion; 83. a belt gripping member; 84. a sticking part; 85. a tape bonding section; 86. a 1 st member; 87. a 2 nd member; 87y, layer 1; 87z, layer 2; 88. a joint portion; BH. Opening the waist; LH, opening of leg girth; CL, center position (longitudinal ); fHy, fibers (long fibers).

Detailed Description

At least the following matters will be made clear from the description of the present specification and the drawings.

An absorbent article comprising an absorbent main body having liquid absorbency and an exterior member provided on a non-skin side of the absorbent main body, wherein the exterior member has a hydrophilic nonwoven fabric containing a hydrophilic oil agent on the non-skin side, and a patch to which an adhesive is applied is provided on a surface of the hydrophilic nonwoven fabric on the non-skin side, and the hydrophilic nonwoven fabric has fibers having a fiber length longer than the smaller one of the dimensions of the patch in the longitudinal direction and the transverse direction.

According to such an absorbent article, the length of the fibers constituting the hydrophilic nonwoven fabric is longer than the minimum width of the patch, and therefore entanglement (interlacing points) of the fibers is easily formed in a range wider than the minimum width of the patch, and the bonding between the fibers is enhanced. Therefore, even when a force for peeling the adherend from the hydrophilic nonwoven fabric acts, the hydrophilic nonwoven fabric is less likely to break at the portion to which the adherend is attached. This makes it possible to prevent the pasted material from being easily peeled off.

In the absorbent article, the longitudinal direction is a direction in which the sticker is stretched with respect to the hydrophilic nonwoven fabric, and the fibers are preferably arranged across the transverse direction of the sticker.

According to such an absorbent article, since the fibers are easily entangled with each other and the bonding force is increased in the region outside the both ends in the transverse direction of the patch, the hydrophilic nonwoven fabric is more unlikely to break even when a force for stretching the patch acts in the longitudinal direction of the patch. This makes it easier to prevent the attached object from coming off.

In the absorbent article, it is preferable that the hydrophilic nonwoven fabric has a plurality of the fibers, and the number of the fibers arranged across the transverse direction of the sticker is larger than the number of the fibers arranged across the longitudinal direction of the sticker.

According to such an absorbent article, among the plurality of fibers constituting the hydrophilic nonwoven fabric, the more the number of fibers spanning the adherend in the direction (transverse direction) orthogonal to the direction in which the adherend is stretched, the less the hydrophilic nonwoven fabric is likely to break. That is, the bonding force of the fibers constituting the hydrophilic nonwoven fabric becomes more resistant to the force of stretching the adherend. This makes the sticker less likely to peel off.

In the absorbent article, the hydrophilic nonwoven fabric preferably has a plurality of compressed portions that compress the hydrophilic nonwoven fabric in the thickness direction.

According to such an absorbent article, the strength of the hydrophilic nonwoven fabric can be improved by providing a plurality of compressed portions. Thus, even when a force for stretching the adherend acts, the hydrophilic nonwoven fabric is less likely to break, and peeling of the adherend can be easily suppressed.

In the absorbent article, the fiber length is preferably longer than a minimum value of a distance between two adjacent compressed parts.

According to such an absorbent article, if the interval between the compressed portions is shorter than the fiber length, the compressed portions are easily formed to overlap with the fibers. That is, the possibility that the fiber itself is compressed becomes high. In the compressed portion of the fibers, the fibers and other fibers are pressed against each other, whereby the bonding force between the fibers is stronger, and the hydrophilic nonwoven fabric is less likely to break. This makes the sticker less likely to peel off.

In the absorbent article, it is preferable that at least one of the compressed portions is disposed in a region where the sticker and the hydrophilic nonwoven fabric overlap each other when viewed from the thickness direction of the exterior member.

According to such an absorbent article, the strength of the portion of the hydrophilic nonwoven fabric where the compressed portion is disposed is increased, and the hydrophilic nonwoven fabric is less likely to break. Therefore, the adherend can be bonded to the region of the hydrophilic nonwoven fabric in which the strength is increased by the arrangement of the compressed portion, and thus peeling of the adherend can be more easily suppressed.

In the absorbent article, it is preferable that a dimension of the smaller of the dimensions of the sticker in the longitudinal direction and the transverse direction is larger than a minimum value of a space between two adjacent compressed portions.

According to such an absorbent article, if the minimum width of the sticker is larger than the interval between the compressed portions, the possibility of arranging two or more compressed portions in the width direction (width direction) of the sticker becomes high. Therefore, the bonding of the fibers in the hydrophilic nonwoven fabric is further enhanced, and the hydrophilic nonwoven fabric is less likely to break at the portion to which the sticker is attached. This makes the sticker less likely to peel off.

In the absorbent article, the outer covering member preferably has a hydrophobic nonwoven fabric having a lower hydrophilicity than the hydrophilic nonwoven fabric at a position closer to the skin than the hydrophilic nonwoven fabric.

According to such an absorbent article, the high-density fibers constituting the hydrophobic nonwoven fabric provided on the skin side cause a capillary phenomenon, and moisture such as sweat is easily absorbed from the skin of the wearer. In addition, the moisture absorbed by the hydrophobic nonwoven fabric is likely to migrate to the hydrophilic nonwoven fabric on the non-skin side due to the difference in the degree of hydrophilicity. Therefore, moisture such as sweat can be absorbed by the exterior member and transferred to the non-skin side, and the absorbed moisture such as sweat can be made to transpire easily to the outside of the absorbent article. This makes it possible to prevent the absorbent article from becoming stuffy and rash when the absorbent article is worn.

In the absorbent article, it is preferable that the hydrophilic nonwoven fabric has an opening portion penetrating through the hydrophilic nonwoven fabric in a thickness direction, and at least one opening portion is disposed in a region where the sticker and the hydrophilic nonwoven fabric overlap when viewed from the thickness direction of the outer covering member.

According to such an absorbent article, the adhesive for attaching the sticker to the hydrophilic nonwoven fabric is easily attached to the hydrophobic nonwoven fabric on the skin side at the portion where the opening portion is provided. That is, the hydrophobic nonwoven fabric and the adherend are directly bonded by the adhesive without being easily affected by the oil agent, and the adhesive strength of the adherend is increased. This can easily prevent the sticker from peeling off from the hydrophilic nonwoven fabric.

In the absorbent article, the sticker is preferably a post-treatment belt for maintaining the absorbent article in a compact form when the used absorbent article is discarded.

According to such an absorbent article, the separation of the finishing belt from the exterior member can be suppressed when the finishing operation for discarding the used absorbent article is performed. Therefore, the stress on the user can be reduced when the absorbent article is subjected to the post-processing operation.

With this absorbent article, it is preferable that the post-treatment belt has: a 1 st member bonded to the hydrophilic nonwoven fabric; and a 2 nd member joined to the non-skin side of the 1 st member at a joint portion provided between one end portion and the other end portion of the 1 st member in the longitudinal direction.

According to such an absorbent article, when the 2 nd member of the finishing belt is stretched during the finishing operation, the stretching force is easily dispersed to both sides (one side and the other side) in the longitudinal direction of the 1 st member around the joint. Therefore, compared to the case where the tensile force (force to peel off the adherend) with respect to the adherend (the 1 st member) is exerted on 1 part in a concentrated manner, the adherend can be made less likely to peel off.

In the absorbent article, it is preferable that a portion of the 1 st member on one side in the longitudinal direction with respect to the joint portion and a portion on the other side in the longitudinal direction with respect to the joint portion are respectively bonded to the hydrophilic nonwoven fabric.

According to such an absorbent article, when a force for stretching the 1 st member acts through the joint portion between the 1 st member and the 2 nd member during the post-processing operation, the force for stretching the 1 st member can be opposed by the attachment portions provided on both sides of the joint portion in the longitudinal direction of the 1 st member. This makes it difficult for the post-treatment belt to separate from the hydrophilic nonwoven fabric, and the user can more easily perform the post-treatment operation of the absorbent article.

In the embodiment 1, the following embodiments are not to be considered in all respects

The absorbent article of the present invention will be described by taking a disposable diaper (hereinafter also referred to as "diaper 1") as an example. However, the absorbent article of the present invention also includes sanitary napkins, pantiliners, and other absorbent articles.

< Structure of diaper 1 >

Fig. 1 is a schematic perspective view of a diaper 1. Fig. 2 is a plan view of the diaper 1 in an unfolded and extended state. Fig. 3 is a schematic sectional view taken along line a-a of fig. 2. The "stretched state" of the diaper 1 means a state in which the entire diaper 1 (the entire product) is stretched without wrinkles, specifically, a state in which the dimensions of the respective members constituting the diaper 1 (for example, an absorbent main body 10, a waist member 20, and the like described later) are matched with or close to the dimensions of the members alone.

The diaper 1 is a disposable diaper having a pants-type shape in a natural state, and in the pants-type state of fig. 1, the diaper 1 has a vertical direction, a horizontal direction, and a front-rear direction which intersect each other, and has a waist opening BH and a pair of leg openings LH and LH. The upper side in the up-down direction corresponds to the waist opening BH side, and the lower side corresponds to the crotch side. The front side in the front-rear direction corresponds to the abdominal side of the wearer, and the rear side corresponds to the back side of the wearer. In addition, in the developed state of fig. 2, the diaper 1 has a longitudinal direction and a lateral direction intersecting each other. The longitudinal direction is a direction along the up-down direction in fig. 1, and corresponds to the longitudinal direction of the absorbent main body 10. The lateral direction is a direction along the left-right direction in fig. 1. As shown in fig. 3, the direction in which the materials constituting the diaper 1 are stacked is defined as the thickness direction. The side in contact with the skin of the wearer in the thickness direction is referred to as the skin side, and the opposite side is referred to as the non-skin side.

The diaper 1 includes a liquid-absorbent main body 10 that absorbs excrement, and a waist member 20 disposed on the non-skin side of the absorbent main body 10. The waist member 20 is an exterior member constituting an exterior package of the diaper 1, and has a front waist portion 30 corresponding to a front portion of the diaper 1 and a rear waist portion 40 corresponding to a rear portion of the diaper 1. That is, the diaper 1 of embodiment 1 is a so-called 3-piece pants-type diaper having as a 1 st member an absorbent main body 10 which is brought into close contact with the crotch of a wearer and absorbs excrement such as urine, a 2 nd member a front waist portion 30 which covers the abdominal portion of the wearer, and a 3 rd member a rear waist portion 40 which covers the back portion of the wearer.

In addition, a predetermined sticker is attached to the exterior member. As shown in fig. 2 and 3, a post-treatment tape 80 (patch) described later is bonded to the non-skin side surface of the back waist portion 40 in the diaper 1. As the article to be attached to the diaper 1, an information display sticker displaying information such as the front and rear sides and the size of the diaper may be attached in addition to the post-treatment tape 80. The portion to which the adhesive material is to be attached is not limited to the rear waist portion 40 of the exterior member, and the adhesive material may be attached to the front waist portion 30.

In the developed state of fig. 2, the absorbent main body 10 is laid between the front waist portion 30 and the rear waist portion 40 in a state where they are arranged in parallel with each other with a space in the longitudinal direction, and the respective end portions 10ea and 10eb in the longitudinal direction (longitudinal direction) of the absorbent main body 10 are joined and fixed to the skin side of the respective closest waist portions 30 and 40, respectively, and the outer shape of the diaper 1 is substantially H-shaped in plan view. From this state, the absorbent body 10 is folded in two with the longitudinal center position CL as the folded position. The front waist portion 30 and the rear waist portion 40 facing each other in the folded state are joined and coupled to each other at the side portions 30sw and 40sw on both sides in the left-right direction, thereby forming a pair of joined portions 50, 50. That is, the front waist portion 30 and the rear waist portion 40 are annularly formed by the pair of side joint portions 50, 50. The side joint portion 50 is formed by a known joining method such as welding or bonding. As a result, the diaper 1 is formed in a pants-type state with the waist opening BH and the pair of leg openings LH and LH shown in fig. 1.

(absorbent body 10)

Fig. 4A is a plan view of the absorbent main body 10, and fig. 4B is a schematic sectional view of the absorbent main body 10. The absorbent main body 10 has an absorbent core 11 that absorbs excretory fluid, a top sheet 12 that is disposed closer to the skin side than the absorbent core 11 in the thickness direction, and a bottom sheet 13 that is disposed closer to the non-skin side than the absorbent core 11. However, the absorbent main body 10 may have a sheet member other than the above-described sheet member. For example, a second sheet (not shown) may be provided between the top sheet 12 and the absorbent core 11 in the thickness direction.

The absorbent core 11 is a member that absorbs and retains excretory fluid such as urine, and is formed of liquid absorbent fibers such as pulp fibers mixed with a Super Absorbent Polymer (SAP), for example. The outer peripheral surface of the absorbent core 11 may be covered with a liquid-permeable sheet member (core wrap sheet 11b) such as tissue paper or nonwoven fabric. The absorbent core 11 of the present embodiment has a narrowed portion 11c having a narrowed width in the left-right direction between the front side end and the rear side end in the longitudinal direction, and has a substantially hourglass shape in plan view as shown in fig. 4A. The narrowed portion 11c is a portion which is sandwiched between the legs of the wearer when the diaper 1 is worn, and the length of this portion in the right-left direction becomes shorter (the width becomes narrower), whereby the absorbent core 11 becomes easy to fit the crotch of the wearer.

The top sheet 12 is a liquid-permeable sheet, and for example, a hydrophilic air-through nonwoven fabric, a spunbond nonwoven fabric, or the like is used. In the present embodiment, as shown in fig. 4B, both side portions in the left-right direction of the top sheet 12 are folded back to the non-skin side to roll in the absorbent core 11.

The bottom sheet 13 has a two-layer structure, and includes a liquid-impermeable sheet 13a and an exterior sheet 13b disposed on the non-skin side of the liquid-impermeable sheet 13 a. As the liquid impermeable sheet 13a, a sheet member having liquid impermeability and moisture permeability is used. For example, a microporous breathable resin film having a plurality of fine pores in a sheet mainly composed of a resin such as polyethylene or polypropylene can be used. In the present specification, the liquid-impermeable sheet 13a is also referred to as a "breathable film". That is, the breathable film is a sheet member having "leak resistance" that does not allow liquid to pass therethrough, and having "moisture permeability" and "breathability" that allow water vapor and air to pass therethrough. On the other hand, a hydrophobic nonwoven fabric having flexibility is used as the outer sheet 13 b. For example, a through-air nonwoven fabric, a spunbond nonwoven fabric, or the like can be used.

A pair of leakage preventing wall portions 15 are provided on both side portions in the left-right direction of the absorbent main body 10 along the longitudinal direction (the longitudinal direction of the absorbent main body 10). In the present embodiment, the leakage preventing wall 15 is formed of the outer sheet 13b described above. Specifically, a pair of leakage preventing wall portions 15 are formed by extending a part of the outer covering sheet 13B outward from both ends of the absorbent core 11 in the left-right direction (lateral direction) and bending the same toward the skin side at a plurality of locations as shown in fig. 4B. The leakage preventing wall elastic member 16 such as a rubber band is attached to the skin-side end portion (distal end portion) of the leakage preventing wall portion 15 in a state of being extended in the longitudinal direction (the longitudinal direction of the absorbent main body 10). When the diaper 1 is worn, the leakage preventing wall 15 is raised toward the skin of the wearer and is fitted to the crotch of the wearer due to the stretchability exhibited by the leakage preventing wall elastic member 16.

The leg hole elastic members 17 such as rubber bands are attached to both side portions in the left-right direction of the absorbent main body 10 in a state of being extended in the longitudinal direction (the longitudinal direction of the absorbent main body 10). When the diaper 1 is worn, the side portions of the absorbent main body 10 contract due to the stretchability exhibited by the leg hole elastic members 17, and the absorbent main body is easily attached along the leg holes of the wearer.

(front side waist body 30)

As shown in fig. 3, the front waistline portion 30 includes a skin side sheet 31 disposed at a position closest to the skin side in the thickness direction, a non-skin side sheet 32 laminated on the non-skin side of the skin side sheet 31 adjacent to the skin side sheet 31, and a waistline elastic member 35 provided between the skin side sheet 31 and the non-skin side sheet 32 in the thickness direction. The front waist portion 30 as an exterior member of the diaper 1 basically has a double-layer structure including the skin-side sheet 31 and the non-skin-side sheet 32, but the front waist portion 30 may have a structure including 3 or more layers in part of the skin-side sheet 36 described later, for example.

The skin-side sheet 31 and the non-skin-side sheet 32 are sheet members having a rectangular shape in plan view as shown in fig. 2, and are formed of, for example, SMS nonwoven fabric or the like. In the diaper 1, the sheet member (nonwoven fabric) constituting the non-skin side sheet 32 has higher hydrophilicity than the sheet member (nonwoven fabric) constituting the skin side sheet 31. That is, the skin side sheet 31 is formed of a nonwoven fabric having low hydrophilicity, and the non-skin side sheet 32 is formed of a nonwoven fabric having higher hydrophilicity than the skin side sheet 31. Hereinafter, the nonwoven fabric forming the skin side sheet 31 is also referred to as "hydrophobic nonwoven fabric", and the nonwoven fabric forming the non-skin side sheet 32 is also referred to as "hydrophilic nonwoven fabric". The "hydrophilicity" of the nonwoven fabric will be described later.

Further, a plurality of opening portions 32h are provided on the surface of the non-skin side sheet 32 as shown in the partially enlarged view of fig. 2. The opening portion 32h is a through hole that penetrates the non-skin side sheet 32 in the thickness direction, and the air permeability of the front waist portion 30 can be improved by providing this opening portion 32 h. Further, the opening hole portion 32h is disposed so as to be visually recognizable from the non-skin surface side of the front waist portion 30, and thus the user can easily think that the front waist portion 30 has good air permeability. Each opening portion 32h may have a circular shape with a diameter of about 1mm, for example, but the shape and arrangement (number and pattern) of the opening portions 32h can be changed as appropriate. In the diaper 1, the skin-side sheet 31 is not provided with through holes corresponding to the hole portions 32 h.

The front waist portion 30 of the present embodiment has a folded-back portion 32f, and the folded-back portion 32f is formed by folding back an upper end portion (a front end portion in the longitudinal direction) of the non-skin side sheet 32 from the non-skin side to the skin side and from the front side in the longitudinal direction to the rear side. By covering a part (upper end portion) of the skin side sheet 31 with the folded-back portion 32f, the upper end edge of the skin side sheet 31 can be prevented from sinking into the skin of the wearer. However, the folded-back portion 32f may not necessarily be provided.

A plurality of the waistline elastic members 35 are arranged in a vertical direction between the skin side sheet 31 and the non-skin side sheet 32, and the waistline elastic members 35 are attached between the skin side sheet 31 and the non-skin side sheet 32 in a state of being extended in the horizontal direction. The front waistline portion 30 is attached to the abdomen-side waistline of the wearer by the stretchability exhibited by the waistline elastic member 35.

The waist elastic member 35 can be attached using an adhesive such as a hot melt adhesive. For example, the waistline elastic member 35 can be attached by applying a hot-melt adhesive to the waistline elastic member 35, stretching the same at a predetermined stretching ratio, and sandwiching the same between the skin side sheet 31 and the non-skin side sheet 32. That is, the skin side sheet 31 and the non-skin side sheet 32 are joined by an adhesive via the waist elastic member 35. The waist elastic member 35 may be attached by applying an adhesive to the skin side sheet 31 and the non-skin side sheet 32, or the waist elastic member 35 may be attached by a welding method using a welding portion 60 described later.

The front waist portion 30 may have a skin surface sheet 36. As shown in fig. 3, the skin-facing sheet 36 is a sheet member disposed so as to cover the upper end (the front end in the longitudinal direction) of the absorbent main body 10 from the skin side, and functions as a covering sheet. This can prevent the upper end edge of the absorbent main body 10 from falling into the skin of the wearer when the diaper 1 is worn. The skin sheet 36 is formed of, for example, SMS nonwoven fabric. The skin sheet 36 may not necessarily be provided.

In the front waistline portion 30 of the present embodiment, in the case where a sheet member is provided at a position closer to the skin side than the skin side sheet 31 or at a position closer to the non-skin side than the non-skin side sheet 32, each sheet is disposed so as to cover only a part of the skin side sheet 31 and the non-skin side sheet 32. For example, the skin sheet 36 in fig. 3 is provided to cover only a part of the skin side sheet 31 on the skin side, and at least a part of the skin side sheet 31 is exposed to the skin side of the wearer.

(rear waist body 40)

The rear waist portion 40 has substantially the same structure as the front waist portion 30. That is, the rear waistline portion 40 includes a skin side sheet 41 disposed at a position closest to the skin side in the thickness direction, a non-skin side sheet 42 laminated on the non-skin side of the skin side sheet 41 adjacent to the skin side sheet 41, and a waistline elastic member 45 provided between the skin side sheet 41 and the non-skin side sheet 42 in the thickness direction. Similarly to the front waist portion 30, the rear waist portion 40 may have an opening portion 42h, a folded portion 42f, a skin surface sheet 46, and the like (see fig. 2 and 3). The structures of the respective members are substantially the same as those of the front waist portion 30, and therefore, the description thereof is omitted.

On the other hand, the external shape of the rear waist portion 40 is different from the external shape of the front waist portion 30. Specifically, as shown in fig. 2, the rear waist portion 40 includes a hip cover 40b having a substantially trapezoidal shape at a position below the side joining portion 50 (side portion 40sw) in the vertical direction. The hip cover 40b is a portion whose width in the left-right direction is narrowed from the upper side to the lower side in the up-down direction, and whose outer edge is curved. By providing the hip cover 40b, the rear waist portion 40 can widely cover the hip of the wearer when the diaper 1 is worn.

The hip cover 40b is provided with a bending elastic member 47 such as a rubber band as shown in fig. 2. The curved elastic member 47 is attached between the skin side sheet 41 and the non-skin side sheet 42 in a state of being stretched along the end edge portion of the hip cover 40b, and the hip cover 40b of the rear waist portion 40 is easily attached to the hip of the wearer and the hip cover 40b is not easily rolled up from the hip by the stretchability exhibited by the curved elastic member 47 when the diaper 1 is worn.

(post-treatment tape 80)

A post-treatment tape 80 used when the diaper 1 is discarded is provided on the non-skin side of the rear waist portion 40 of the diaper 1. Fig. 5 is a schematic cross-sectional view showing the aftertreatment belt 80 provided on the non-skin-side surface of the rear waist portion 40. Fig. 6A is a schematic perspective view of the diaper 1 in a state where the aftertreatment belt 80 is developed, as viewed from the back side. Fig. 6B is a schematic perspective view showing a state in which the diaper 1 in the state of fig. 6A is rolled up and disposed of. In fig. 5 and 6, the elastic member 45 and the like are omitted for convenience of explanation, and the illustration is simplified.

As shown in fig. 2 and 6, the post-treatment tape 80 is a long belt-like member extending in the up-down direction, and is adhered (bonded) to the non-skin side surface of the non-skin side sheet 42 of the rear waist portion 40 with an adhesive or the like. The post-processing tape 80 includes a tape main body 81, a tape holding portion 82, a tape holding member 83, an attaching portion 84, and a plurality of tape adhering portions 85. In a state where the longitudinal direction and the width direction of the rectangular post-treatment tape 80 are aligned with the vertical direction (longitudinal direction) and the lateral direction (lateral direction) of the diaper 1, respectively, a tape grip portion 82 is provided at one end portion 80e in the longitudinal direction of the post-treatment tape 80, and an attachment portion 84 is provided at the other end portion 80f in the longitudinal direction.

The one end portion 80e of the post-treatment belt 80 can be extended toward the waistline opening BH by being developed as shown in fig. 6A. In order to make the diaper 1 compact when the diaper 1 is discarded, for example, both ends in the left-right direction of the rear waist portion 40 are folded toward the abdomen side, and the diaper 1 is rolled up from the crotch side toward the waist opening side, thereby achieving the state shown in fig. 6B. At this time, the diaper 1 can be maintained in a compact form by bonding the post-treatment tape 80 to the portion 1p beyond the waistline opening BH by the tape bonding portion 85.

The other end portion 80f of the post-treatment tape 80 is fixed to the non-skin-side surface (non-skin side sheet 42) of the rear waist portion 40 by an attachment portion 84 formed of an adhesive. It is preferable that the attached portion 84 is not detached from the rear waist portion 40, that is, the attached portion 84 is not peeled off, even when the one end portion 80e is stretched when the post-treatment tape 80 is stretched as shown in fig. 6A.

For example, as shown in fig. 5, the post-treatment tape 80 in an unused state is folded into a Z-letter shape in the longitudinal direction. The belt main body 81 is folded in a letter Z shape, and thus the belt main body 81 has three layers of a 1 st layer 81x located closest to the skin side, a 3 rd layer 81Z located closest to the non-skin side, and a 2 nd layer 81y located between the 1 st and 3 rd layers. In the folded state in the shape of the letter Z, tape adhesive portions 85 having a peelable adhesive strength are provided between the non-skin side surface of the 1 st layer 81x and the skin side surface of the 2 nd layer 81y adjacent in the thickness direction and between the non-skin side surface of the 2 nd layer 81y and the skin side surface of the 3 rd layer 81Z adjacent in the thickness direction, respectively. That is, the tape adhesive portion 85 allows the 1 st layer 81x and the 2 nd layer 81y to be adhered to each other and the 2 nd layer 81y and the 3 rd layer 81z to be adhered to each other again after being peeled off.

The unused post-processing tape 80 is temporarily fixed in a folded state in the shape of the letter Z by the tape bonding portion 85. The tape adhesive portions 85 are not necessarily provided over the entire regions between the non-skin-side surface of the 1 st layer 81x and the skin-side surface of the 2 nd layer 81y and between the non-skin-side surface of the 2 nd layer 81y and the skin-side surface of the 3 rd layer 81 z. Each tape bonding portion 85 may have any bonding range as long as it has a bonding strength capable of temporarily fixing the unused post-processing tape 80 in a folded state in the shape of the letter Z. The tape bonding portion 85 may not be entirely formed of an adhesive. For example, the temporary fixing of the 2 nd layer 81y and the 3 rd layer 81z may be performed by compression, pressure bonding, or the like instead of the adhesive.

As shown by the two-dot chain line in fig. 6A, when the tape holding portion 82 is pulled in the longitudinal direction (vertical direction), the close contact state between the surfaces formed by the tape bonding portion 85 is released, and the post-treatment tape 80 can be unfolded and extended toward the upper waistline opening BH.

The belt main body 81 is a member to be a base material of the post-treatment belt 80, and a resin material such as polyethylene or polypropylene can be exemplified. The belt main body 81 of the present embodiment is made of a transparent resin material having smooth surfaces on both surfaces. The belt main body 81 may be a pulp material such as paper, and may be a fiber aggregate such as a nonwoven fabric or a woven fabric, for example, without being limited to a form having smooth surfaces on both surfaces. However, in order to release the close contact between the surfaces of the post-treatment tapes 80 while maintaining the Z-folded state by the adhesion of the tape adhesion sections 85, it is more preferable to use a resin material such as polyethylene or polypropylene to have smooth surfaces on both surfaces.

The belt gripping portion 82 is a portion where a person who performs the post-processing of the diaper 1 grips the post-processing belt 80. The belt gripping portion 82 is provided at an end portion of the post-treatment belt 80, and the belt gripping member 83 is provided at the belt gripping portion 82. Specifically, the tape holding member 83 is fixed to the skin-side surface of the tape main body 81 by an adhesive (not shown) or the like so as not to be peelable, and no adhesive is attached to the outer peripheral surface of the tape holding portion 82. The belt holding member 83 is made of a colorless and transparent resin material such as polyethylene or polypropylene. For example, the tape grip 82 may be only a portion where the adhesive is not provided at the one end portion 80e of the tape main body 81, or may be a portion where the one end portion 80e of the tape main body 81 is folded back toward the skin side and the tape main bodies 81 are attached to each other, as the tape grip 82.

The post-treatment tape 80 itself of the diaper 1 is not substantially stretchable in the longitudinal direction, but is not limited thereto. The belt main body 81 may be formed of an elastic material such as rubber and may have stretchability in the longitudinal direction. The post-processing tape 80 may not necessarily be folded into the letter Z shape, and may be folded into the letter V shape by folding in two, or may be folded into the letter W shape by folding in four, or may be folded with a number of folds greater than the number of folds of the letter W shape.

< hydrophilicity with respect to sheet Member >

Next, the hydrophilicity of the sheet member constituting the diaper 1 will be described. In the diaper 1, hydrophobic nonwoven fabrics are used as the skin side sheets 31 and 41 constituting the waist member 20 (the front waist portion 30 and the rear waist portion 40) as the exterior member and the exterior sheet 13b of the absorbent main body 10. On the other hand, hydrophilic nonwoven fabrics having higher hydrophilicity than hydrophobic nonwoven fabrics are used as the non-skin side sheets 32 and 42 constituting the waist member 20.

The hydrophilic nonwoven fabric of the present embodiment is a nonwoven fabric having improved hydrophilicity by performing a treatment (hydrophilic treatment) of adhering a predetermined oil agent to a hydrophobic nonwoven fabric. As the oil agent used for the hydrophilic treatment, for example, a commercially available oil agent effective as an antistatic agent for fibers, such as an anionic oil agent, a nonionic oil agent, and a mixture thereof, can be used. By feeding these oil agents into the oil tank and supplying the oil using an oil supply roller or the like, the hydrophilicity of the hydrophobic nonwoven fabric can be improved, and a hydrophilic nonwoven fabric can be obtained. However, the hydrophilic nonwoven fabric may be formed by other methods. For example, a hydrophilic nonwoven fabric may be obtained by producing a nonwoven fabric using fibers having high hydrophilicity.

In the present embodiment, the whole nonwoven fabric constituting the non-skin side sheets 32 and 42 is subjected to hydrophilic treatment, and the hydrophilicity of the whole sheet members is improved. However, the hydrophilicity of only a part of the region of each sheet member may be increased. For example, a sheet member having a portion with high hydrophilicity and a portion with low hydrophilicity in part may be formed by performing hydrophilic treatment or the like only on a part of the non-skin side sheet 32.

The hydrophilicity of the sheet member can be evaluated by measuring the contact angle when the ion-exchanged water is brought into contact with the surface of the sheet member. Specifically, when the contact angle between the hydrophilic nonwoven fabric and ion-exchanged water is smaller than the contact angle between the hydrophobic nonwoven fabric and ion-exchanged water, the hydrophilicity of the hydrophilic nonwoven fabric is higher than the hydrophilicity of the hydrophobic nonwoven fabric. The hydrophilic nonwoven fabric (e.g., the non-skin side sheet 32) used in the present embodiment preferably has a contact angle with ion-exchanged water of less than 90 °, more preferably 50 ° or less. On the other hand, the hydrophobic nonwoven fabric (skin-side sheet 31) preferably has a contact angle with ion-exchanged water of 90 ° or more, and more preferably 120 ° or more.

For example, the contact angle can be measured by the following method using a contact angle meter MCA-J manufactured by synechia interface science co. First, ion-exchanged water (about 20 picoliters) was dropped onto the surface of the fiber constituting the sheet member (measurement target sheet) to be measured, and immediately thereafter, the contact angle was measured using the contact angle meter. The measurement is performed at a plurality of sites (for example, 5 sites or more) on the surface of the measurement sheet, and the average value of these sites is defined as the contact angle. The measurement environment temperature was set to 22 ℃.

The contact angle may be measured by imaging the measurement sheet on which the ion-exchanged water has been dropped from the cross-sectional direction of the measurement sheet, analyzing the imaged image, and measuring the angle formed between the droplet of the ion-exchanged water and the measurement sheet.

< moisture absorption and transpiration with respect to diaper 1 >

In the diaper 1, the highly hydrophilic nonwoven fabric is provided on the non-skin side surface of the exterior member (the front waist portion 30 and the rear waist portion 40), so that moisture such as sweat can be absorbed from the skin of the wearer and the absorbed moisture can be evaporated into the atmosphere. Fig. 7A to 7C are views for explaining the basic principle when moisture is absorbed and transpired in the diaper 1. In fig. 7, a cross section of the front waist portion 30 among the members constituting the diaper 1 is schematically shown.

First, as shown in fig. 7A, when the diaper 1 is worn by the wearer, the skin-side sheet 31 (hydrophobic nonwoven fabric) disposed on the skin side in the thickness direction of the front waist portion 30 comes into contact with the skin of the wearer. As described above, the skin side sheet 31 of the present embodiment is formed of an SMS nonwoven fabric containing meltblown fibers having a fiber diameter smaller than that of the spunbond fibers. Therefore, the skin side sheet 31 has a portion in which the fine meltblown fibers are tightly entangled and the distance between the fibers is narrowed. With such a configuration, a capillary phenomenon occurs in the skin side sheet 31, and moisture such as sweat attached to the skin of the wearer can be easily absorbed.

Next, as shown in fig. 7B, the moisture absorbed by the skin side sheet 31 is transferred to a non-skin side sheet 32 (hydrophilic nonwoven fabric) laminated on the non-skin side of the skin side sheet 31 adjacent to the skin side sheet 31. This is because, since the skin side sheet 31 is a hydrophobic nonwoven fabric, and the non-skin side sheet 32 is a hydrophilic nonwoven fabric, a difference in hydrophilicity (hydrophilic gradient) is generated between the two sheets, and moisture easily moves from the skin side sheet 31 having low hydrophilicity to the non-skin side sheet 32 having high hydrophilicity. Therefore, moisture is difficult to be retained on the side of the skin side sheet 31 that is in contact with the skin of the wearer, and moisture is easy to be retained on the side of the non-skin side sheet 32 that is not in contact with the skin of the wearer.

The moisture held in the non-skin side sheet 32 is transpired into the atmosphere from the non-skin side of the non-skin side sheet 32. In the diaper 1, the non-skin side sheet 32 is disposed on the outermost (non-skin) side surface of the absorbent main body 10. That is, the non-skin side surface of the non-skin side sheet 32 serves as an interface with the atmosphere. Therefore, the moisture contained in the non-skin side sheet 32 can be effectively transpired from the non-skin side surface to the outside of the diaper 1 over a wide range. However, it is not necessary to dispose the hydrophilic nonwoven fabric on the entire surface of the exterior member closest to the non-skin side. For example, another member (e.g., an adhesive such as the aftertreatment belt 80) different from the non-skin side sheet 32 may be provided in a part of the surface of the exterior member closest to the non-skin side.

In this way, in the exterior member (waist member 20) of the diaper 1, the moisture absorbed by the hydrophobic nonwoven fabric from the skin of the wearer is transferred to the hydrophilic nonwoven fabric on the non-skin side, and is released from the non-skin side surface of the hydrophilic nonwoven fabric into the atmosphere. That is, moisture can be absorbed and effectively transpired into the atmosphere. This makes it difficult for moisture to contact the skin of the wearer, and can suppress the skin of the wearer from becoming moist and causing skin problems such as blotches or the like, or causing discomfort to the wearer.

< operation in connection with the aftertreatment of diaper 1 >

Next, problems that occur when disposal is performed after the diaper 1 is used will be described. As described in fig. 6A and 6B, when the used diaper 1 is discarded, a post-treatment operation is performed in which the diaper 1 is fixed by the post-treatment tape 80 in a state in which the post-treatment tape 80 is unwound and the diaper 1 is rolled up with the absorbent main body 10 having absorbed excrement as the inside. In the post-treatment operation, the tape holding portion 82 (one end portion 80e) is pulled toward the non-skin side in order to unfold the post-treatment tape 80 in the folded state, but in this case, the sticking portion 84 may be peeled off. That is, when the belt gripping portion 82 is stretched, the post-treatment belt 80 (sticker) may be detached from the non-skin side sheet 42 of the rear waist portion 40.

Fig. 8A and 8B are views for explaining a factor of detachment of the finishing tape 80 in the finishing operation of the diaper 1.

Fig. 8A is a diagram illustrating an influence of a decrease in adhesive force of the attaching portion 84, which is the 1 st factor. As described above, in the post-treatment belt 80, the 1 st layer 81x closest to the skin side of the belt main body 81 is attached to the non-skin side sheet 42 of the rear-side waist portion 40 via the attachment portion 84 formed of an adhesive. That is, the 1 st layer 81x and the non-skin side sheet 42 are fixed to each other in an opposing state by the adhesive force of the attaching portion 84. When the belt grip 82 (one end 80e) of the post-treatment belt 80 is pulled toward the non-skin side from this state, a force acts in a direction of peeling the 1 st layer 81x (the attachment portion 84) of the belt main body 81 from the non-skin side sheet 42.

In the diaper 1, a hydrophilic nonwoven fabric subjected to a hydrophilic treatment with a predetermined oil agent is used as the non-skin side sheet 42, and the oil agent is contained in the non-skin side sheet 42. Therefore, the attached portion 84 may be easily peeled off due to the influence of the oil agent. That is, the adhesive strength of the bonded portion 84 may be lower than that in the case of bonding to an oil-free nonwoven fabric (hydrophobic nonwoven fabric). In this case, as shown in fig. 8A, the adhesive portion 84 may peel off from the non-skin side surface of the non-skin side sheet 42, and the post-treatment belt 80 may be detached.

Next, fig. 8B is a diagram illustrating an influence of bonding between fibers of the hydrophilic nonwoven fabric, which is the 2 nd main factor. Generally, a nonwoven fabric is formed by entangling a plurality of fibers with each other, and the more the portion (also referred to as "entanglement point") where each fiber is entangled with another fiber, the stronger the bonding force between the fibers becomes, and the less the nonwoven fabric becomes breakable. When the post-treatment tape 80 (adherend) attached to the surface of such a nonwoven fabric is stretched toward the non-skin side during the post-treatment operation of the diaper 1, a force acts in a direction in which the attached portion 84 is peeled off from the non-skin side sheet 42.

When the post-treatment belt 80 is stretched, the bonds between the fibers constituting the nonwoven fabric may be cut, and the nonwoven fabric may be partially broken. For example, when a force acts in the direction of peeling the attached portion 84 from the non-skin side sheet 42 (hydrophilic nonwoven fabric), the non-skin side sheet 42 may break if the bonding force between the fibers of the non-skin side sheet 42 is weaker than the adhesive force between the non-skin side sheet 42 and the attached portion 84. That is, as shown in fig. 8B, the fibers in the vicinity of the surface of the non-skin side sheet 42 are entangled (entangled) and are not entangled with each other, and the vicinity of the surface of the non-skin side sheet 42 may be broken and separated. As a result, the post-treatment tape 80 (the attached portion 84) may be detached from the non-skin side sheet 42.

In order to solve such a problem, in the diaper 1 of the present embodiment, the separation of the post-treatment belt 80 during the post-treatment operation is suppressed by adjusting the length of the fibers constituting the non-skin side sheet 42 (hydrophilic nonwoven fabric) to which the post-treatment belt 80 is attached.

Fig. 9 is a diagram illustrating the relationship between the fibers constituting the non-skin side sheet 42 (hydrophilic nonwoven fabric) of the diaper 1 and the post-treatment belt 80. In the diaper 1 of the present embodiment, the non-skin side sheet 42 (hydrophilic nonwoven fabric) is configured to have fibers having a fiber length longer than the width dimension of the post-treatment belt 80 (adhesive material). Here, the width of the sticker is the smaller of the longitudinal and lateral dimensions of the sticker. In the diaper 1, in the case where the patch is the longitudinal strip-shaped post-treatment tape 80, the dimension of the post-treatment tape 80 in the transverse direction is the width dimension of the patch.

In the case of fig. 9, the natural fiber length LfHy of a certain fiber fHy among the fibers constituting the non-skin side sheet 42 (hydrophilic nonwoven fabric) as the adherend is longer than the dimension W80 in the transverse direction of the post-treatment tape 80 as the adherend (LfHy > W80). As the fiber length LfHy of the fiber fHy constituting the hydrophilic nonwoven fabric is longer, the number of interlacing points with other fibers is increased, and the fibers are easily entangled with each other to increase the bonding force, so that the hydrophilic nonwoven fabric is less likely to break. In addition, the fiber length LfHy is longer than the width W80 of the post-treatment tape 80, and thus entanglement of the fibers becomes easy to form in a range wider than the width W80 of the post-treatment tape 80. That is, since the interlacing points of the fibers are formed in the region wider than W80, even when a force acts in the direction in which the post-treatment tape 80 is stretched, the hydrophilic nonwoven fabric can be made less likely to break at the portion to which the post-treatment tape 80 is attached. Therefore, the post-treatment tape 80 is less likely to be peeled off due to weak bonding force between fibers constituting the hydrophilic nonwoven fabric as described in at least fig. 8B. This makes it possible to make the post-treatment tape 80 (sticker) less likely to peel off from the non-skin side sheet 42 (hydrophilic nonwoven fabric).

In fig. 9, the fibers fHy are arranged in a direction (transverse direction) orthogonal to the direction (longitudinal direction) in which the post-treatment tape 80 (sticker) is stretched. In other words, in the transverse direction, the left end fHyel of the fiber fHy is located to the left of the left end 80el of the aftertreatment tape 80, and the right end fHyer of the fiber fHy is located to the right of the right end 80er of the aftertreatment tape 80. In this case, the fiber fHy is highly likely to have a crossing point with another fiber in the region outside the both ends 80el, 80er of the post-treatment belt 80 in the left-right direction. Therefore, in the hydrophilic nonwoven fabric, the fibers are less likely to be entangled with each other in the regions on both outer sides in the left-right direction than the portion where the width W80 of the post-treatment tape 80 is stuck, and the bonding force is increased. As a result, the hydrophilic nonwoven fabric is more resistant to breakage with respect to the force that stretches the post-treatment tape 80 (the joining section 84), and detachment of the post-treatment tape 80 can be easily suppressed.

The arrangement direction of the fibers constituting the non-skin side sheet 42 (hydrophilic nonwoven fabric) is not limited to the direction extending in the lateral direction as shown in fig. 9, and some of the fibers may be arranged in other directions (for example, the longitudinal direction). However, as described above, if the fibers are arranged across the sticker in the direction (transverse direction) orthogonal to the direction (longitudinal direction) in which the post-treatment tape 80 (sticker) is stretched, the hydrophilic nonwoven fabric can be made less likely to break. That is, the sticker can be made less likely to peel off from the hydrophilic nonwoven fabric. Therefore, it is preferable that the fibers of the hydrophilic nonwoven fabric be oriented in a direction that coincides with a direction (transverse direction) orthogonal to the direction in which the post-treatment tape 80 (sticker) is stretched. In other words, it is preferable that the number of fibers per unit volume arranged across the sticker in the transverse direction is greater than the number of fibers per unit volume arranged across the sticker in the longitudinal direction. With such a configuration, the pasted material can be further prevented from being easily peeled off.

In the diaper 1, the post-treatment tape 80 as an adhesive material to be attached to the non-skin side sheet 42 (hydrophilic nonwoven fabric) is provided on the premise that it is stretched in a direction to be peeled from the hydrophilic nonwoven fabric at the time of a post-treatment operation after the diaper 1 is used. Therefore, if the adhesive portion 84 is simply peeled off, the function of the post-processing tape 80 is lost, and the user (user) cannot comfortably perform the post-processing operation. In contrast, in the present embodiment, as described above, the fiber length and orientation of the fibers constituting the hydrophilic nonwoven fabric and the arrangement of the post-treatment belt 80 are adjusted, and thus, the post-treatment belt 80 is easily prevented from being detached from the non-skin side sheet 42 (hydrophilic nonwoven fabric) during the post-treatment operation of the diaper 1. Therefore, the user's stress and discomfort associated with the post-treatment operation of the diaper 1 can be reduced.

In addition, the structure of the post-treatment belt 80 itself may be changed so that the post-treatment belt 80 (sticker) is not easily detached from the hydrophilic nonwoven fabric. Fig. 10 is a schematic cross-sectional view showing a modification of the post-treatment belt 80. Fig. 11A and 11B are diagrams illustrating forces acting on the post-processing belt 80 of the modification when performing the post-processing operation.

The post-treatment belt 80 described in fig. 5 is composed of a belt main body 81 that is one belt base material folded in a Z-letter shape, but as shown in fig. 10, the post-treatment belt 80 of the modification is composed of two different belt base materials, a 1 st member 86 and a 2 nd member 87 provided on the non-skin side of the 1 st member 86. However, other base materials (for example, the 3 rd member) may be provided. The structures of the members 86 and 87 serving as the belt base materials and the structures other than the joint portion 88 for joining them are basically substantially the same as those of the post-treatment belt 80 described with reference to fig. 5.

The 1 st member 86 and the 2 nd member 87 are both belt-shaped members formed of a resin material such as polyethylene or polypropylene, as in the belt main body 81 described above. The 1 st member 86 is fixed to the non-skin side sheet 42 (hydrophilic nonwoven fabric) of the rear waist portion 40 by the attachment portion 84. On the other hand, the 2 nd member 87 is folded in a V-letter shape, and has two layers, a 1 st layer 87y on the skin side and a 2 nd layer 87z on the non-skin side. The 1 st layer 87y and the 2 nd layer 87z are bonded together so as to be peelable by the tape bonding section 85. On the other hand, the 1 st member 86 and the 2 nd member 87 are bonded together by a bonding portion 88 formed of an adhesive or the like so as not to be peeled. Further, the joint portion 88 is provided between one end portion and the other end portion of the 1 st member 86 in the longitudinal direction. In other words, the engaging portions 88 are provided at predetermined distances from the upper end and the lower end of the first member 86 in the up-down direction in fig. 10. That is, as shown in fig. 11, the 1 st member 86 and the 2 nd member 87 have upper end portions RU and lower end portions RD in the up-down direction that have portions that are not engaged with each other.

When the post-treatment operation of the diaper 1 is performed using the post-treatment tape 80 of the modified example, first, the tape holding member 83 (one end portion 80e in the longitudinal direction) is pulled toward the non-skin side to peel off the tape adhesive portion 85, and the post-treatment tape 80 is developed in the longitudinal direction. At this time, as shown in fig. 11A, the 2 nd member 87 is in a state of standing up from the 1 st member 86 toward the non-skin side with the joint portion 88 as a starting point. When the 2 nd member 87 (the belt holding member 83) is further pulled toward the non-skin side from this state, a portion (a portion where the joint portion 88 is provided) located between both end portions in the longitudinal direction (the vertical direction in fig. 11A) of the 1 st member 86 is pulled toward the non-skin side. Therefore, the tensile force applied to the 1 st member 86 (attached portion 84) is distributed and applied to both sides in the longitudinal direction around the joint portion 88.

The post-processing belt 80 illustrated in fig. 5 has a structure in which a belt main body 81 having a single body is folded into a Z-letter shape. Therefore, when the tape holding member 83 (one end portion 80e) is pulled in the post-processing operation, the tensile force applied to the attaching portion 84 is concentrated on the upper end portion in the vertical direction of the 1 st layer 81x of the tape main body 81 (the boundary portion between the 1 st layer 81x and the 2 nd layer 81y in fig. 5). That is, the tensile force is easily concentrated on 1 portion (upper end portion in the vertical direction) in the longitudinal direction of the attached portion 84. In contrast, in the post-treatment tape 80 of the modified example, since the tensile force applied to the attached portion 84 can be dispersed in the longitudinal direction (vertical direction), the attached portion 84 can be made less likely to peel off compared to the case where a large force is applied to 1 portion of the attached portion 84.

When the 2 nd member 87 (the belt holding member 83) is further pulled toward the non-skin side from the state of fig. 11A, as shown in fig. 11B, the portion of the 1 st member 86 bonded to the 2 nd member 87 by the joint portion 88 is pulled toward the non-skin side. On the other hand, in the 1 st member 86, the end portion RU on one side in the longitudinal direction (upper side in the vertical direction) of the joining portion 88 and the end portion RD on the other side in the longitudinal direction (lower side in the vertical direction) of the joining portion 88 are bonded to the non-skin side sheet 42 (hydrophilic nonwoven fabric) via the bonding portion 84, and the tensile force can be resisted at the portions of the end portion RU and the end portion RD.

That is, in fig. 11B, the 1 st member 86 is provided with adhesive sections (adhesive sections 84) that are adhered to the non-skin side sheet 42 (hydrophilic nonwoven fabric) on both side sections RU and RD in the longitudinal direction of the section (section of the joint section 88) where the tension of the 2 nd member 87 acts. Therefore, the 1 st member 86 can be more easily peeled off because the sticking portions 84 at two locations on both sides thereof can resist the tensile force applied to the 1 st member 86. As a result, the post-treatment belt 80 is less likely to separate from the non-skin side sheet 42 (hydrophilic nonwoven fabric), and the post-treatment operation of the diaper 1 can be performed more easily.

Fig. 12 is an enlarged plan view showing a region B in fig. 2, which illustrates a state of a surface of a portion of the non-skin side sheet 42 to which the aftertreatment tape 80 is attached. As shown in fig. 12, a plurality of compression portions 42e for compressing the non-skin side sheet 42 in the thickness direction are provided on the surface of the non-skin side sheet 42 (hydrophilic nonwoven fabric). The compressed portions 42e are formed by embossing when the hydrophilic nonwoven fabric is manufactured, and the strength of the hydrophilic nonwoven fabric can be improved by providing such compressed portions 42 e. In fig. 12, each of the compressed parts 42e is, for example, a circular shape having a diameter of about 0.5mm, and the compressed parts 42e and 42e adjacent to each other are arranged in a lattice shape with a gap G42e of about 2 mm. This makes the non-skin side sheet 42 less likely to break, and the post-treatment belt 80 (adherend) as described in fig. 8B can be less likely to separate.

It is preferable that the minimum value G42e of the intervals between the compressed parts 42e and 42e formed in the non-skin side sheet 42 (hydrophilic nonwoven fabric) be shorter than the fiber length LfHy of the fiber fHy constituting the hydrophilic nonwoven fabric (G42e < LfHy). If the interval G42e is shorter than the fiber length LfHy, the compressed portion 42e is likely to be formed at a position overlapping the fiber fHy. That is, the fibers fHy themselves are more likely to be compressed when the compression portion 42e is formed. In the compressed portion of the fibers fHy, since the fibers fHy are easily pressure-bonded to other fibers, the bonding force between the fibers is stronger and the hydrophilic nonwoven fabric is less likely to break than in the case where the fibers are merely entangled with each other. This makes the sticker less likely to peel off.

Further, it is preferable that at least one compressed portion 42e is disposed in a portion where the post-treatment belt 80 (sticker) overlaps with the non-skin side sheet 42 (hydrophilic nonwoven fabric) when viewed from the thickness direction of the non-skin side sheet 42 (hydrophilic nonwoven fabric). As described above, the strength of the hydrophilic nonwoven fabric is increased in the portion where the compressed portion 42e is disposed, and the nonwoven fabric is less likely to break. Therefore, by attaching the adherend to such a portion that is not easily broken, peeling of the adherend can be easily suppressed. In the present embodiment, as shown in fig. 12, since the plurality of compressed portions 42e are arranged in the region (bonded portion 84) where the post-treatment tape 80 is bonded, the post-treatment tape 80 can be made less likely to come off.

At this time, it is more preferable that the width W80 of the post-treatment tape 80 (also the width of the pasting section 84) is larger than the interval G42e between the compressed sections 42e (W80 > G42 e). If the width W80 of the post-processing belt 80 is larger than the interval G42e between the compressed portions 42e, the possibility of arranging at least 1 compressed portion 42e and further two or more compressed portions 42e in the transverse direction (width direction) of the post-processing belt 80 becomes high. Therefore, as described above, in the portion to which the post-treatment tape 80 (sticker) is attached, the bonding force between the fibers is strong, and the hydrophilic nonwoven fabric is less likely to break. This makes it possible to further prevent the post-treatment belt 80 from being detached.

Further, it is preferable that at least one open hole portion 42h is disposed in a portion where the post-treatment belt 80 (sticker) overlaps with the non-skin side sheet 42 (hydrophilic nonwoven fabric) when viewed from the thickness direction of the non-skin side sheet 42 (hydrophilic nonwoven fabric). In the portion where the opening hole portion 42h is disposed, the adhesive forming the attachment portion 84 is attached to the skin side sheet 41 (hydrophobic nonwoven fabric) disposed on the skin side of the non-skin side sheet 42 (hydrophilic nonwoven fabric). That is, in the case where the post-treatment tape 80 (sticker) is directly bonded to the oil-free hydrophobic nonwoven fabric in the portion of the open hole portion 42h, the bonding strength can be enhanced as compared with the case where the post-treatment tape is bonded to the oil-containing hydrophilic nonwoven fabric. Therefore, compared to the case where the opening portion 42h and the attached portion 84 do not overlap, the post-treatment tape 80 (attached portion 84) can be easily prevented from being peeled off from the rear waist portion 40.

< modification of method for attaching waist elastic members 35, 45 >

In the above embodiment, the waistline elastic members 35, 45 are attached to the waistline member 20 by an attachment method using a hot melt adhesive or the like, but the method of attaching the waistline elastic members 35, 45 is not limited thereto. For example, the waistline elastic members 35, 45 may be attached to the waistline member 20 by a welding method such as ultrasonic welding. Since ultrasonic welding is a known technique, the description of ultrasonic welding will be omitted in this specification.

Fig. 13A and 13B are views for explaining a method of attaching the waist elastic member 35 to the front waist portion 30 using the welded portion 60. In the present modification, the waistline elastic member 35 is attached to the front waistline portion 30 by a plurality of welded portions 60, 60 … … disposed in a dispersed manner in the left-right direction and the up-down direction. Each of the welded portions 60 is formed into a substantially rectangular shape by ultrasonic welding, and they join the skin side sheet 31 and the non-skin side sheet 32 of the front waist portion 30 in the thickness direction. The waistline elastic member 35 is attached to the front waistline portion 30 by sandwiching the waistline elastic member 35 from both sides in the vertical direction by 1 pair of fusion-bonded portions 60s composed of two fusion-bonded portions 60, 60 adjacent in the vertical direction.

As shown in fig. 13A, the pair of fusion-bonded portions 60 and 60 constituting the fusion-bonded portion pair 60s are arranged with an interval GH60 in the vertical direction. The distance GH60 is set to be the same as the diameter d35t of the waist elastic member 35 in the state of being stretched to a predetermined stretch ratio or slightly larger than the diameter d35t (GH 60. gtoreq.d 35 t). That is, the waistline elastic member 35 in the stretched state is disposed between the pair of welded portions 60s in the up-down direction.

Next, as shown in fig. 13B, when the waistline elastic member 35 is relaxed from the stretched state, the waistline elastic member 35 contracts in the left-right direction and expands in the up-down direction, and the diameter d35 in its natural state becomes larger than the interval GH60 in the up-down direction of the pair of welded portions 60s (d35 > GH 60). Thereby, the waistline elastic member 35 is pressed in the vertical direction by the welding portions 60, 60. As a result, the waist elastic member 35 is attached to the front waist portion 30.

In the pants-type diaper 1 of fig. 1, the waist elastic members 35(45) are in a natural state relaxed from the extended state. In the pants-type diaper 1, the waist elastic member 35(45) is joined to the front waist portion 30 (the rear waist portion 40) by the side joining portions 50, 50 at both side portions in the right and left direction. Therefore, even if the front waist portion 30 (the rear waist portion 40) is stretched in the left-right direction when the diaper 1 is worn, the waist elastic members 35(45) do not fall off from the waist member 20.

In the 2 nd embodiment, the following embodiments are also provided

In embodiment 2, a pants-type diaper 2 (hereinafter also referred to as "diaper 2") having a structure partially different from that of embodiment 1 will be described. Fig. 14A is a plan view of the diaper 2 in an unfolded and extended state. Fig. 14B is a schematic sectional view taken along line D-D of fig. 14A. Note that each direction (for example, the longitudinal direction, the lateral direction, and the like) in fig. 14A and 14B is the same as each direction defined in embodiment 1.

The diaper 2 of embodiment 2 includes a liquid-absorbent main body 10 and a waist member 20 as an exterior member joined to the non-skin side of the absorbent main body 10. As shown in fig. 14A and 14B, the waist member 20 of the diaper 2 is continuously and integrally formed in the longitudinal direction (the longitudinal direction of the absorbent main body 10). That is, the diaper 2 is a so-called two-piece disposable diaper including two components, i.e., an absorbent body 10 and an outer cover member (a waistline member 20). Hereinafter, a portion of the outer covering member (waist member 20) of the diaper 2 on the front side in the longitudinal direction with respect to the center position CL will be described as a front waist portion 30, and a portion on the rear side with respect to the center position CL will be described as a rear waist portion 40 (see fig. 14A).

When the diaper 2 in the developed state of fig. 14A is formed into a pants type, the absorbent body 10 and the waist member 20 are folded in half with the longitudinal center position CL as a folded position. The front waist portion 30 and the rear waist portion 40 facing each other in the folded state are joined and connected to each other via the side portions 30sw and 40sw on both sides in the left-right direction, thereby forming a pair of joined portions 50, 50. As a result, similarly to the diaper 1 of fig. 1, the diaper 2 is in a pants-type state having a waist opening BH and a pair of leg openings LH and LH.

In the diaper 2, the basic structure and function of the absorbent main body 10 are substantially the same as those of the diaper 1 of embodiment 1, and therefore, the description thereof is omitted. However, the backsheet 13 of the diaper 2 may have only the liquid-impermeable sheet 13a (breathable film) and no outer sheet 13 b. This is because the diaper 2 is provided with the waistline member 20 over the entire non-skin side surface of the absorbent main body 10, and the waistline member 20 functions as an exterior sheet of the absorbent main body 10. Therefore, the bottom sheet 13 of the absorbent body 10 of the diaper 2 does not need to be provided with a sheet member corresponding to the outer sheet 13B of the diaper 1 (see fig. 14B).

The waistline member 20 includes a skin side sheet 21, a non-skin side sheet 22 laminated adjacent to the skin side sheet 21 on the non-skin side of the skin side sheet 21, and waistline elastic members 35, 45 (see fig. 14B) arranged between the skin side sheet 21 and the non-skin side sheet 22 in the thickness direction. The skin side sheet 21 is a hydrophobic nonwoven fabric similar to the skin side sheets 31 and 41 of the diaper 1. The non-skin side sheet 22 is a hydrophilic nonwoven fabric similar to the non-skin side sheets 32 and 42 of the diaper 1. That is, in the diaper 2, the non-skin side sheet 22 is a nonwoven fabric having higher hydrophilicity than the skin side sheet 21. Similarly to the diaper 1, the waistline elastic members 35, 45 are formed of rubber bands or the like, and are attached between the skin-side sheet 21 and the non-skin-side sheet 22 in a state of being stretched in the left-right direction.

A post-treatment tape 80 (sticker) used for performing a post-treatment operation of the diaper 2 is attached to the non-skin side sheet 22 (hydrophilic nonwoven fabric) of the rear waist portion 40 of the diaper 2. The function and structure of the post-processing belt 80 are substantially the same as those of the post-processing belt 80 described in embodiment 1, and therefore, the description thereof is omitted (see fig. 5, 10, and the like).

The diaper 2 according to embodiment 2 can also provide the same effects as those of the diaper 1. That is, in the diaper 2, the hydrophilic nonwoven fabric of the non-skin side sheet 22 constituting the rear waist portion 40 has fibers having a fiber length longer than the smaller one of the dimensions of the post-treatment tape 80 (patch) in the longitudinal direction and the transverse direction. With such a structure, the plurality of fibers constituting the hydrophilic nonwoven fabric are easily entangled with each other, and the bonding force is strong, so that the hydrophilic nonwoven fabric is less likely to break. Further, since the fiber length is longer than the width of the post-treatment tape 80, the fibers are easily entangled with each other outside the region to which the post-treatment tape 80 is attached, and therefore, even when the post-treatment tape 80 is stretched, the hydrophilic nonwoven fabric is resistant to the stretching force and is less likely to break. Therefore, the post-treatment tape 80 (sticker) can be made less likely to peel off from the non-skin side sheet 22 (hydrophilic nonwoven fabric). In addition, the diaper 2 has basically the same features as the diaper 1 described in embodiment 1.

In the 3 rd embodiment, the term "first" means that the first component is not moved to the second component

In embodiment 3, a pants-type diaper 3 (hereinafter also referred to as "diaper 3") having a structure partially different from that of the above-described embodiment will be described. Fig. 15A is a plan view of the diaper 3 in an unfolded and extended state. Fig. 15B is a schematic sectional view taken along line E-E of fig. 15A. Note that each direction (for example, the longitudinal direction, the lateral direction, and the like) in fig. 15A and 15B is the same as each direction defined in embodiment 1.

The diaper 3 of embodiment 3 includes a liquid-absorbent main body 10 and a waistline member 20 as an exterior member joined to the non-skin side of the absorbent main body 10. As shown in fig. 15A and 15B, the waist member 20 of the diaper 3 is continuously and integrally formed in the longitudinal direction (the longitudinal direction of the absorbent main body 10). That is, the skin-side sheet 21 is an integral sheet member continuous from one end portion to the other end portion in the longitudinal direction. On the other hand, the non-skin side sheet 32 (front non-skin side sheet) disposed on the front side in the longitudinal direction and the non-skin side sheet 42 (rear non-skin side sheet) disposed on the rear side in the longitudinal direction are constituted as different sheet members that are discontinuous in the longitudinal direction. A diaper having such a structure is also referred to as a simple 3-piece type disposable diaper. In the following, a portion of the outer covering member (waist member 20) of the diaper 3 on the front side of the center position CL in the longitudinal direction is described as the front waist portion 30, and a portion on the rear side of the center position CL is described as the rear waist portion 40 (see fig. 15A).

When the diaper 3 in the developed state of fig. 15A is formed into a pants type, the absorbent body 10 and the waist member 20 are folded in two with the longitudinal center position CL as a folded position. The front waist portion 30 and the rear waist portion 40 facing each other in the folded state are joined and connected to each other via the side portions 30sw and 40sw on both sides in the left-right direction, thereby forming a pair of joined portions 50, 50. As a result, similarly to the diaper 1 of fig. 1, the diaper 3 is in a pants-type state having a waist opening BH and a pair of leg openings LH and LH.

In the diaper 3, the basic structure and function of the absorbent main body 10 are substantially the same as those of the absorbent main body 10 of the diaper 2 according to embodiment 2, and therefore, the description thereof is omitted.

The front waist portion 30 of the outer covering member (waist member 20) of the diaper 3 has: a skin side sheet 21 extending from one end side (ventral side) to the other end side (dorsal side) in the longitudinal direction on the skin side in the thickness direction; a non-skin side sheet 32 that is laminated on the non-skin side of the skin side sheet 21 adjacent to the skin side sheet 21 on the front side (ventral side) in the longitudinal direction; and a waistline elastic member 35 disposed between the skin side sheet 21 and the non-skin side sheet 32 in the thickness direction. The rear waist portion 40 includes a skin side sheet 21 common to the front waist portion 30, a non-skin side sheet 42 laminated on the non-skin side of the skin side sheet 21 adjacent to the skin side sheet 21 on the rear side (back side) in the longitudinal direction, and a waist elastic member 45 disposed between the skin side sheet 21 and the non-skin side sheet 42 in the thickness direction.

The skin side sheet 21 is a hydrophobic nonwoven fabric similar to the skin side sheets 31 and 41 of the diaper 1. The non-skin side sheets 32 and 42 are hydrophilic nonwoven fabrics similar to the non-skin side sheets 32 and 42 of the diaper 1. That is, in the diaper 3, the non-skin side sheets 32 and 42 are nonwoven fabrics having higher hydrophilicity than the skin side sheet 21. Similarly to the diaper 1, the waistline elastic members 35, 45 are formed of rubber bands or the like, and are attached between the skin-side sheet 21 and the non-skin- side sheets 32, 42 in a state of being stretched in the left-right direction.

A post-treatment tape 80 (sticker) used for performing a post-treatment operation of the diaper 3 is attached to the non-skin side sheet 42 (hydrophilic nonwoven fabric) of the rear waist portion 40 of the diaper 3. The function and structure of the post-processing belt 80 are substantially the same as those of the post-processing belt 80 described in embodiment 1, and therefore, the description thereof is omitted (see fig. 5, 10, and the like).

The diaper 3 of embodiment 3 can also provide the same effects as those of the diaper 1. That is, in the diaper 3, the hydrophilic nonwoven fabric constituting the non-skin side sheet 42 of the rear waist portion 40 has fibers having a fiber length longer than the smaller one of the dimensions of the post-treatment tape 80 (patch) in the longitudinal direction and the transverse direction. With such a structure, the plurality of fibers constituting the hydrophilic nonwoven fabric are easily entangled with each other, and the bonding force is strong, so that the hydrophilic nonwoven fabric is less likely to break. Further, since the fiber length is longer than the width of the post-treatment tape 80, the fibers are easily entangled with each other outside the region to which the post-treatment tape 80 is attached, and therefore, even when the post-treatment tape 80 is stretched, the hydrophilic nonwoven fabric is resistant to the stretching force and is less likely to break. Therefore, the post-treatment tape 80 (sticker) can be made less likely to peel off from the non-skin side sheet 42 (hydrophilic nonwoven fabric). In addition, the diaper 3 basically has substantially the same features as the diaper 1 described in embodiment 1.

Embodiment 4 ═ th ═ embodiment ═ 4 ═ embodiment ═ 4 ═ embodiment ═ embodiment ═ may be used

In embodiment 4, a "belt-type diaper" (hereinafter, also referred to as "diaper 4") different from the "pants-type diaper" described in embodiments 1 to 3 will be described as an example of an absorbent article. Fig. 16A is a plan view of the diaper 4 in an unfolded and extended state. Fig. 16B is a schematic sectional view taken along line F-F of fig. 16A. Note that each direction (for example, the longitudinal direction, the lateral direction, and the like) in fig. 16A and 16B is the same as each direction defined in embodiment 1.

As shown in fig. 16A and 16B, the diaper 4 includes an absorbent core 11 that absorbs excrement, a liquid-permeable top sheet 12 positioned closer to the skin side than the absorbent core 11, a liquid-impermeable sheet 13a positioned closer to the non-skin side than the absorbent core 11, an exterior sheet 25 positioned closer to the non-skin side than the liquid-impermeable sheet 13a, and a pair of side sheets 18 joined to the skin side of the top sheet 12 on both side portions in the left-right direction of the top sheet 12. Further, leg elastic members 17 (e.g., elastic bands) extending and contracting in the longitudinal direction are disposed on both side portions of the diaper 4 in the lateral direction.

The absorbent core 11, the top sheet 12, and the liquid-impermeable sheet 13a of the diaper 4 are parts corresponding to the absorbent main body 10 in the diaper 1, and they have the same functions as the absorbent core 11, the top sheet 12, and the liquid-impermeable sheet 13a constituting the absorbent main body 10 of the diaper 1, respectively. For example, the liquid-impermeable sheet 13a is a breathable film that can transmit moisture such as urine absorbed by the absorbent core 11 as water vapor.

The outer sheet 25 of the diaper 4 is an outer member corresponding to the waist member 20 of the diaper 1, and the outer sheet 25 is formed of a hydrophilic nonwoven fabric similarly to the non-skin side sheets 32 and 42 constituting the waist member 20 of the diaper 1. The outer covering member of the diaper 4 may have the same structure as the waist member 20 of the diaper 1. For example, a hydrophobic nonwoven fabric (not shown in fig. 16B) may be provided adjacent to the skin side of the exterior sheet 25 made of a hydrophilic nonwoven fabric, and the exterior member of the diaper 4 may be configured by two sheet members.

For convenience of description, a portion of the diaper 4 located forward of the center position CL in the longitudinal direction is referred to as a front waist portion 30, and a portion located rearward of the center position CL is referred to as a rear waist portion 40 (see fig. 16A).

The pair of side sheets 18 are made of a liquid-permeable nonwoven fabric similar to the top sheet 12, and a leakage preventing wall elastic member 16 such as a rubber band which is stretchable in the longitudinal direction is provided at the inner end in the lateral direction of the side sheet 18. When the diaper 4 is worn, the laterally inner end portions of the side sheets 18 are raised toward the skin of the wearer by the contraction force exerted by the leakage preventing wall elastic members 16, and the leakage preventing wall portions 15 are formed in the same manner as in the diaper 1.

A pair of fastening tapes 26 extending to both outer sides in the left-right direction are provided on the back side (rear waist portion 40) in the longitudinal direction of the diaper 4. A surface fastener 26f having a plurality of hook members (not shown) is provided on the skin-side surface of the free end side (outer side in the left-right direction) of the fastening tape 26. Further, a target sheet 27 for engaging the hook and loop fastener 26 when the diaper 4 is worn is provided on the non-skin side surface of the abdomen side (front waist portion 30) in the longitudinal direction of the diaper 4. The target sheet 27 is a member capable of engaging with the surface fastener 26f (hook member) of the surface fastener 26, and is formed of, for example, nonwoven fabric.

Further, a back-side elastic member 19 that stretches and contracts in the left-right direction (lateral direction) is provided on the back side (back-side waist portion 40) in the longitudinal direction of the diaper 4. The back-side elastic member 19 is a belt-like elastic member formed of a stretchable nonwoven fabric or the like, and is attached to the diaper 4 in a state of being stretched in the left-right direction. When the diaper 4 is worn on the body of the wearer by the stretching force exerted by the back-side elastic member 19, the diaper 4 is easily fitted to the waist of the wearer.

A post-treatment tape 80 (sticker) used for performing a post-treatment operation of the diaper 4 is attached to the outer sheet 25 (hydrophilic nonwoven fabric) of the rear waist portion 40 of the diaper 4. The function and structure of the post-processing belt 80 are substantially the same as those of the post-processing belt 80 described in embodiment 1, and therefore, the description thereof is omitted (see fig. 5, 10, and the like).

When the diaper 4 is worn, for example, the diaper 4 in the developed state shown in fig. 16A is disposed in the crotch portion of the wearer, the front waist portion 30 is attached to the abdomen side portion of the wearer, and the rear waist portion 40 is attached to the back side portion (hip portion) of the wearer. Then, the pair of surface fasteners 26, 26 are wound from the back side to the abdomen side along the waist of the wearer, and the surface fastener 26f is engaged with the target sheet 27 on the abdomen side of the wearer. This enables the waist opening BH and the pair of leg openings LH and LH to be formed substantially in the same manner as the diaper 1, and enables the position of the diaper 4 to be fixed with respect to the body (crotch portion) of the wearer.

The diaper 4 may not necessarily be provided with the target sheet 27. For example, instead of disposing the target sheet 27 on the non-skin side surface of the exterior sheet 25, the diaper 4 may be worn by directly engaging the surface fastener 26f with the nonwoven fabric constituting the exterior sheet 25.

The diaper 4 of embodiment 4 can also provide the same effects as those of the diaper 1. That is, in the diaper 4, the hydrophilic nonwoven fabric constituting the exterior sheet 25 of the rear waist portion 40 has fibers having a fiber length longer than the smaller one of the dimensions of the post-treatment tape 80 (the adherend) in the longitudinal direction and the lateral direction. With such a structure, the plurality of fibers constituting the hydrophilic nonwoven fabric are easily entangled with each other, and the bonding force is strong, so that the hydrophilic nonwoven fabric is less likely to break. Further, since the fiber length is longer than the width of the post-treatment tape 80, the fibers are easily entangled with each other outside the region to which the post-treatment tape 80 is attached, and therefore, even when the post-treatment tape 80 is stretched, the hydrophilic nonwoven fabric is resistant to the stretching force and is less likely to break. Therefore, the post-treatment tape 80 (sticker) can be made less likely to peel off from the exterior sheet 25 (hydrophilic nonwoven fabric). In addition, the diaper 4 has basically the same features as those of the diaper 1 described in embodiment 1.

Other embodiments are also possible

Although the embodiments of the present invention have been described above, the above embodiments are intended to facilitate understanding of the present invention, and are not intended to limit and explain the present invention. It is to be understood that the present invention can be modified and improved without departing from the gist thereof, and the present invention includes equivalents thereof.

Claims (12)

1. An absorbent article having a liquid-absorbent main body and an exterior member provided on a non-skin side of the absorbent main body,

the exterior member has a hydrophilic nonwoven fabric containing a hydrophilic oil agent on the non-skin side,

an adhesive material adhered with an adhesive is provided on the non-skin side surface of the hydrophilic nonwoven fabric,

the hydrophilic nonwoven fabric has fibers having a fiber length longer than the smaller one of the dimensions of the sticker in the longitudinal direction and the transverse direction orthogonal to the longitudinal direction.

2. The absorbent article according to claim 1,

the longitudinal direction is a direction in which the sticker is stretched with respect to the hydrophilic nonwoven fabric,

the fibers are disposed across the transverse direction of the sticker.

3. The absorbent article according to claim 2,

the hydrophilic nonwoven fabric has a plurality of the fibers,

a number of the fibers disposed across the transverse direction of the sticker is greater than a number of the fibers disposed across the longitudinal direction of the sticker.

4. The absorbent article according to any one of claims 1 to 3,

the hydrophilic nonwoven fabric has a plurality of compressed portions that compress the hydrophilic nonwoven fabric in the thickness direction.

5. The absorbent article according to claim 4,

the fiber length is longer than a minimum value of an interval between two adjacent compressed parts.

6. The absorbent article according to claim 4,

at least one of the compressed portions is disposed in a region where the sticker and the hydrophilic nonwoven fabric overlap each other when viewed in a thickness direction of the exterior member.

7. The absorbent article according to claim 4,

the size of the smaller one of the sizes of the sticker in the longitudinal direction and the transverse direction is larger than the minimum value of the interval between the adjacent two of the compressed portions.

8. The absorbent article according to any one of claims 1 to 3,

the exterior member has a hydrophobic nonwoven fabric having a hydrophilicity lower than that of the hydrophilic nonwoven fabric at a position closer to the skin than the hydrophilic nonwoven fabric.

9. The absorbent article of claim 8,

the hydrophilic nonwoven fabric has an opening part penetrating through the hydrophilic nonwoven fabric in a thickness direction,

at least one of the open sections is disposed in a region where the sticker and the hydrophilic nonwoven fabric overlap each other when viewed in a thickness direction of the exterior member.

10. The absorbent article according to any one of claims 1 to 3,

the sticker is a post-treatment belt for maintaining the absorbent article in a compact form when the absorbent article after use is discarded.

11. The absorbent article of claim 10,

the post-treatment belt has:

a 1 st member bonded to the hydrophilic nonwoven fabric; and

and a 2 nd member joined to the non-skin side of the 1 st member at a joint portion provided between one end portion and the other end portion of the 1 st member in the longitudinal direction.

12. The absorbent article of claim 11,

the portion of the 1 st member on one side in the longitudinal direction from the joint portion and the portion on the other side in the longitudinal direction from the joint portion are bonded to the hydrophilic nonwoven fabric.

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