Absorbent article

Abstract

Provided is an absorbent article. A sticker attached to an outer cover of an absorbent article using a hydrophilic nonwoven fabric is less likely to peel off. An absorbent article (1) has an absorbent main body (10) and an outer cover member (20) provided on a non-skin side of the absorbent main body (10), wherein the outer cover member (20) has a hydrophilic nonwoven fabric (42) containing a hydrophilic oil agent on the non-skin side, has a sticker (80) attached with an adhesive on a surface on the non-skin side of the hydrophilic nonwoven fabric (42), and the hydrophilic nonwoven fabric (42) has fibers (42f) having a length in a dimension smaller of a longitudinal direction of the sticker (80) and a transverse direction orthogonal to the longitudinal direction.

Description

TECHNICAL FIELD

[0001] The present application relates to an absorbent article. BACKGROUND

[0002] In the past, a pant-type diaper using a hydrophilic nonwoven fabric in which hydrophilicity is improved by containing a hydrophilic oil agent has been known. For example, in Patent Literature 1, as an outer sheet 4 constituting an outer cover 3 of a diaper 1, a technology related 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 is disclosed.

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Literature 1: Japanese Patent Application Laid-Open No. 2017-113186 SUMMARY

[0006] Problems to be Solved by the Invention

[0007] Sometimes, an adherend such as a so-called post-treatment tape, a front and back display tape, or the like is adhered to the surface of the outer cover of a disposable diaper using an adhesive. However, in the diaper of Patent Literature 1, due to the influence of the oil agent (hydrophilizing agent) for hydrophilizing the hydrophilic nonwoven fabric, there is a possibility that the adherend easily peels off from the surface of the outer cover. In addition, when stretching is performed for the purpose of unfolding the post-treatment tape (adherend) after use of the diaper, there is a risk that the adhesion of the fibers constituting the hydrophilic nonwoven fabric to each other is cut, and the nonwoven fabric is partially broken, and the adherend peels off from the outer cover.

[0008] The present application is made in view of the above-described conventional problems, and aims to make an adherend adhered to an outer cover of an absorbent article using a hydrophilic nonwoven fabric less likely to peel off.

[0009] Means for Solving the Problems

[0010] The main application for achieving the above-described object is an absorbent article having a liquid-absorbing absorbent main body and an outer cover member provided at a position on a non-skin side of the absorbent main body, characterized in that the outer cover member has a hydrophilic nonwoven fabric containing a hydrophilic oil agent on the non-skin side, a face on the non-skin side of the hydrophilic nonwoven fabric has an adherend adhered with an adhesive, and the hydrophilic nonwoven fabric has fibers having a fiber length longer than the dimension of the smaller one of the longitudinal direction and the transverse direction of the adherend.

[0011] Other features of the present application are apparent from the description and the drawings.

[0012] Effects of the Invention

[0013] According to the present application, it is possible to prevent the adhesive material adhered to the outer cover of the absorbent article using the hydrophilic nonwoven fabric from being easily peeled off. BRIEF DESCRIPTION OF DRAWINGS

[0014] FIG. 1 is a schematic perspective view of the diaper 1.

[0015] FIG. 2 is a plan view of the diaper 1 in an unfolded and stretched state.

[0016] FIG. 3 is a schematic cross-sectional view at the A-A line of FIG. 2

[0017] FIG. 4A is a plan view of the absorbent main body 10, FIG. 4B is a schematic cross-sectional view of the absorbent main body 10.

[0018] FIG. 5 is a cross-sectional schematic view showing the back treatment tape 80 provided to the back waist portion 40 on the non-skin side.

[0019] FIG. 6A is a schematic perspective view when the diaper 1 in a state where the back treatment tape 80 is unfolded is observed from the back side. FIG. 6B is a schematic perspective view showing a case where the diaper 1 in a state where FIG. 6A is rolled up to become a disposal state.

[0020] FIG. 7A to FIG. 7C is a diagram explaining the basic principle when water is absorbed and evaporated in the diaper 1.

[0021] FIG. 8A and FIG. 8B is a diagram explaining the main reason why the back treatment tape 80 is detached in the back treatment operation of the diaper 1.

[0022] FIG. 9 is a diagram explaining the relationship between the fiber of the non-skin side sheet 42 (hydrophilic nonwoven fabric) constituting the diaper 1 and the back treatment tape 80.

[0023] FIG. 10 is a cross-sectional schematic view showing a modification of the back treatment tape 80.

[0024] FIG. 11A and FIG. 11B is a diagram explaining the force acting on the modified back treatment tape 80 when the back treatment operation is performed.

[0025] FIG. 12 ​Fig. 10 is a diagram illustrating a state of a surface of a portion to which the back processing tape 80 is attached to the non-skin side sheet 42.

[0026] FIG. 13A Fig. 11 is a diagram illustrating a state of a surface of a portion to which the back processing tape 80 is attached to the non-skin side sheet 42. FIG. 13B Fig. 12 is a diagram illustrating a method of attaching the waist elastic member 35 to the front waist portion 30 using the fusion portion 60.

[0027] FIG. 14A Fig. 13 is a plan view of the diaper 2 in an unfolded and elongated state. FIG. 14B Fig. 14 is a diagram illustrating a state of a surface of a portion to which the back processing tape 80 is attached to the non-skin side sheet 42. FIG. 14A Fig. 15 is a diagram illustrating a state of a surface of a portion to which the back processing tape 80 is attached to the non-skin side sheet 42.

[0028] FIG. 15A Fig. 16 is a plan view of the diaper 3 in an unfolded and elongated state. FIG. 15B Fig. 17 is a diagram illustrating a state of a surface of a portion to which the back processing tape 80 is attached to the non-skin side sheet 42. FIG. 15A Fig. 18 is a diagram illustrating a state of a surface of a portion to which the back processing tape 80 is attached to the non-skin side sheet 42.

[0029] FIG. 16A Fig. 19 is a plan view of the diaper 4 in an unfolded and elongated state. FIG. 16B Fig. 20 is a diagram illustrating a state of a surface of a portion to which the back processing tape 80 is attached to the non-skin side sheet 42. FIG. 16A Fig. 21 is a diagram illustrating a state of a surface of a portion to which the back processing tape 80 is attached to the non-skin side sheet 42.

[0030] Explanation of Reference Numerals

[0031] 1, 2, 3, 4, 10, 11, 11b, 11c, 12, 13, 13a, 13b, 15, 16, 17, 18, 19, 20, 21, 22, 25, 26, 26f, 27, 30, 30sw, 31, 32, 32f, 32h, 35, 36, 40, 40b, 40sw, 41, 42, 42f, 42e, 42h, 45, 46, 47, 50, 60, 60s, 80, 80e, 80f, 81, 81x, 81y, 81z, 82, 83, 84, 85, 86, 87, 87y, 87z, 88, BH, LH, CL, fHy. DETAILED DESCRIPTION

[0032] According to the description and the drawings of the present specification, at least the following matters are clarified.

[0033] An absorbent article having an absorbent main body having liquid absorbency and an outer member provided at a position on a non-skin side of the absorbent main body, characterized in that the outer member has a hydrophilic nonwoven fabric containing a hydrophilic oil agent on the non-skin side, a sticker adhered by an adhesive on a surface of the non-skin side of the hydrophilic nonwoven fabric, and the hydrophilic nonwoven fabric has fibers having a fiber length longer than a dimension of a smaller one of a longitudinal direction and a transverse direction of the sticker.

[0034] According to such an absorbent article, the fiber length of the fiber constituting the hydrophilic nonwoven fabric is longer than the minimum width of the adhesive, and thus entanglement (interlacing points) of the fibers with each other becomes easy in a wider range than the minimum width of the adhesive, and the binding of the fibers with each other becomes strong. Therefore, even in a case where a force to peel the adhesive from the hydrophilic nonwoven fabric acts, the hydrophilic nonwoven fabric becomes less likely to be broken in a portion where the adhesive is attached. Thus, the adhesive can be made less likely to be peeled.

[0035] For this absorbent article, it is preferable that the longitudinal direction be a direction in which the adhesive is stretched with respect to the hydrophilic nonwoven fabric, and the fibers be arranged across the transverse direction of the adhesive.

[0036] According to such an absorbent article, since the fibers are easily entangled with each other and the binding force becomes strong in a region outside the transverse direction both ends of the adhesive, even in a case where a force to stretch the adhesive in the longitudinal direction of the adhesive acts, the hydrophilic nonwoven fabric becomes more less likely to be broken. Thus, the separation of the adhesive can be more easily suppressed.

[0037] For this absorbent article, it is preferable that the hydrophilic nonwoven fabric have a plurality of the fibers, and the number of the fibers arranged across the transverse direction of the adhesive be larger than the number of the fibers arranged across the longitudinal direction of the adhesive.

[0038] According to such an absorbent article, among the plurality of fibers constituting the hydrophilic nonwoven fabric, the more the number of the fibers arranged across the adhesive in a direction orthogonal to the direction in which the adhesive is stretched (transverse direction), the less likely the hydrophilic nonwoven fabric becomes to be broken. That is, the binding force of the fibers constituting the hydrophilic nonwoven fabric becomes easy to resist the force to stretch the adhesive. Thus, the adhesive can be made more less likely to be peeled.

[0039] For this absorbent article, it is preferable that the hydrophilic nonwoven fabric have a plurality of compression portions that compress the hydrophilic nonwoven fabric in a thickness direction.

[0040] According to such an absorbent article, by providing a plurality of compression portions, the strength of the hydrophilic nonwoven fabric can be improved. Thus, even in a case where a force to stretch the adhesive acts, the hydrophilic nonwoven fabric becomes less likely to be broken, and the adhesive can be easily suppressed from being peeled.

[0041] For this absorbent article, it is preferable that the fiber length be longer than a minimum value of intervals of two adjacent compression portions.

[0042] According to such an absorbent article, if the interval of the compressed portion is shorter than the fiber length, the compressed portion is easily formed in a state of overlapping the fibers. That is, the fibers themselves are highly likely to be compressed. In the portion where the fibers are compressed, the fibers are pressure-bonded to other fibers, and thus the binding force of the fibers to each other is strengthened, and the hydrophilic nonwoven fabric becomes more difficult to break. Thus, the adherend can be more difficult to peel off.

[0043] For this absorbent article, it is preferable that the region where the adherend and the hydrophilic nonwoven fabric overlap when viewed in the thickness direction of the outer cover member be provided with at least one compressed portion.

[0044] According to such an absorbent article, the strength of the portion of the hydrophilic nonwoven fabric where the compressed portion is provided is increased, and the hydrophilic nonwoven fabric becomes difficult to break. Thus, the adherend is adhered to the region of the hydrophilic nonwoven fabric where the strength is increased by providing the compressed portion, and thus the adherend can be more easily inhibited from peeling off.

[0045] For this absorbent article, it is preferable that the dimension of the smaller one of the longitudinal direction and the lateral direction of the adherend be larger than the minimum value of the interval of the two adjacent compressed portions.

[0046] According to such an absorbent article, if the minimum width of the adherend is larger than the interval of the compressed portions, the likelihood of providing two or more compressed portions in the width direction of the adherend is increased. Thus, the binding of the fibers to each other in the hydrophilic nonwoven fabric is further strengthened, and the hydrophilic nonwoven fabric becomes difficult to break in the portion where the adherend is adhered. Thus, the adherend can be more difficult to peel off.

[0047] For this absorbent article, it is preferable that the outer cover member have a hydrophobic nonwoven fabric having a lower hydrophilicity than the hydrophilicity of the hydrophilic nonwoven fabric at a position closer to the skin side than the hydrophilic nonwoven fabric.

[0048] According to such an absorbent article, moisture such as sweat is easily absorbed from the wearer's skin due to the capillary phenomenon caused by the high-density fibers constituting the hydrophobic nonwoven fabric provided on the skin side. Also, the moisture absorbed by the hydrophobic nonwoven fabric is easily transferred to the hydrophilic nonwoven fabric on the non-skin side based on the difference in hydrophilicity. Thus, the outer cover member can absorb moisture such as sweat and transfer it to the non-skin side, and the absorbed moisture such as sweat can easily evaporate to the outside of the absorbent article. Thus, when the absorbent article is worn, it is difficult to cause a stuffy feeling, rash, or the like.

[0049] For the absorbent article, it is preferable that the hydrophilic nonwoven fabric have an opening portion that penetrates through the hydrophilic nonwoven fabric in the thickness direction, and that the region in which the adhesive member and the hydrophilic nonwoven fabric overlap when viewed from the thickness direction of the outer member be provided with at least one of the opening portions.

[0050] According to such an absorbent article, in the portion provided with the opening portion, the adhesive of the adhesive member adhering to the hydrophilic nonwoven fabric becomes easy to adhere to the hydrophobic nonwoven fabric on the skin side. That is, a portion in which the hydrophobic nonwoven fabric and the adhesive member adhered directly by the adhesive are formed so as not to be easily affected by the oil agent, and the adhesive strength of the adhesive member becomes strong. Thus, it is possible to easily suppress peeling of the adhesive member from the hydrophilic nonwoven fabric.

[0051] For the absorbent article, it is preferable that the adhesive member be a post-processing tape for maintaining the absorbent article in a compact form after disposal of the absorbent article after use.

[0052] According to such an absorbent article, when the post-processing operation for the absorbent article after use is performed, it is possible to suppress detachment of the post-processing tape from the outer member. Thus, when the post-processing operation of the absorbent article is performed, it is possible to reduce the stress on the user.

[0053] For the absorbent article, it is preferable that the post-processing tape have a first member adhered to the hydrophilic nonwoven fabric, and a second member joined to the non-skin side of the first member by a joining portion provided between the one side end portion and the other side end portion in the length direction of the first member.

[0054] According to such an absorbent article, when the second member of the post-processing tape is stretched during the post-processing operation, it is easy to disperse the stretching force to both sides (one side and the other side) in the length direction of the first member with the joining portion as the center. Thus, compared to a case in which the stretching force (force to peel the adhesive member) of the adhesive member (first member) is concentrated on one portion, it is possible to make the adhesive member less likely to be peeled.

[0055] For the absorbent article, it is preferable that the portion of the first member on the one side in the length direction from the joining portion and the portion of the first member on the other side in the length direction from the joining portion be adhered to the hydrophilic nonwoven fabric, respectively.

[0056] According to such an absorbent article, in the case where a force that stretches the first member is applied via the joint portion of the first member and the second member at the time of the post-treatment operation, the force that stretches the first member can be counteracted by the adhesive portions provided on both sides of the joint portion in the length direction of the first member. Thus, the post-treatment belt becomes less likely to be detached from the hydrophilic nonwoven fabric, and the user can more easily perform the post-treatment operation of the absorbent article.

[0057] == First Embodiment ==

[0058] As the absorbent article of the present application, a disposable diaper (hereinafter also referred to as "diaper 1") is described as an example. However, the absorbent article of the present application also includes sanitary napkins, panty liners, and other absorbent articles.

[0059] <Structure of Diaper 1>

[0060] FIG. 1 is a schematic perspective view of the diaper 1. FIG. 2 is a plan view of the diaper 1 in an unfolded and stretched state. FIG. 3 is a schematic cross-sectional view at the A-A line of FIG. 2 . Further, the "stretched state" of the diaper 1 means a state in which the entire diaper 1 (the entire product) is stretched to be wrinkle-free, and specifically means a state in which the dimensions of each member (for example, the absorbent main body 10, the waist member 20, and the like described later) that constitutes the diaper 1 are identical to or close to the dimensions of the member alone.

[0061] The diaper 1 is a disposable diaper that has a short pants type shape in a natural state, and in the short pants type state of FIG. 1 , the diaper 1 has an up-down direction, a left-right direction, and a front-rear direction that cross each other, and has a waist opening BH and a pair of leg opening LH, LH. The upper side in the up-down direction corresponds to the waist opening BH side, and the lower side corresponds to the lower crotch side. In addition, 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 unfolded state of FIG. 2 , the diaper 1 has a longitudinal direction and a lateral direction that cross each other. The longitudinal direction is a direction along the up-down direction in FIG. 1 , and corresponds to the length direction of the absorbent main body 10. The lateral direction is a direction along the left-right direction in FIG. 1 . In addition, as shown in FIG. 3 , the direction in which the materials that constitute the diaper 1 are stacked is set as the thickness direction. The side that contacts the skin of the wearer in the thickness direction is set as the skin side, and the opposite side is set as the non-skin side.

[0062] The diaper 1 has an absorbent body 10 that absorbs excrement and a waist member 20 disposed on the non-skin side of the absorbent body 10. The waist member 20 is an outer packaging component that constitutes the outer packaging of the diaper 1, and it has a front waist portion 30 corresponding to the front part of the diaper 1 and a rear waist portion 40 corresponding to the back part of the diaper 1. That is, the diaper 1 of the first embodiment is a so-called three-piece shorts-type diaper, which has an absorbent body 10 that fits snugly against the crotch of the wearer and absorbs excrement such as urine as a first component, a front waist portion 30 that covers the abdominal side of the wearer as a second component, and a rear waist portion 40 that covers the back side of the wearer as a third component.

[0063] Additionally, predetermined adhesive is affixed to the outer components. In diaper 1, for example... FIG. 2 as well as FIG. 3 As shown, a finishing strip 80 (adhesive) described later is affixed to the non-skin side of the rear waist section 40. In addition to the finishing strip 80, information display stickers showing the front and back of the diaper, size, etc., can also be affixed as adhesive to the diaper 1. Furthermore, the location for affixing the adhesive is not limited to the rear waist section 40 of the outer component; it can also be affixed to the front waist section 30.

[0064] exist FIG. 2 In its unfolded state, with the front waist section 30 and the rear waist section 40 arranged parallel to each other at intervals in the longitudinal direction, an absorbent body 10 is laid between them. The ends 10ea and 10eb of the absorbent body 10 in the longitudinal direction are respectively joined and fixed to the skin side of their closest waist sections 30 and 40. The diaper 1 has an approximate H-shape when viewed from above. From this state, the absorbent body 10 is folded in half with the longitudinal center position CL as the folding position. In this folded state, the front waist section 30 and the rear waist section 40, which are opposite each other, are joined and connected to each other on their left and right sides 30sw and 40sw, forming a pair of side joints 50, 50. That is, the front waist section 30 and the rear waist section 40 are formed into a ring shape by the pair of side joints 50, 50. Furthermore, the side joints 50 are formed by known joining methods such as welding and bonding. Thus, it becomes the formation of FIG. 1 The diaper 1 is shown in a shorts-like configuration with a waist opening (BH) and a pair of leg openings (LH, LH).

[0065] (Absorbent Subject 10)

[0066] FIG. 4A This is a top view of the absorbent body 10. FIG. 4Bis a schematic cross-sectional view of the absorbent main body 10. The absorbent main body 10 has an absorbent core 11 that absorbs excreted liquid, a top sheet 12 disposed at a position closer to the skin side than the absorbent core 11 in the thickness direction, and a bottom sheet 13 disposed at a position closer to the non-skin side than the absorbent core 11. However, the absorbent main body 10 can have sheet members other than the above-described sheet members. For example, a second sheet (not shown) can be provided between the top sheet 12 and the absorbent core 11 in the thickness direction.

[0067] The absorbent core 11 is a member that absorbs and holds excreted liquid such as urine, and is formed of, for example, liquid-absorbing fibers such as pulp fibers mixed with superabsorbent polymers (SAP). In addition, the outer peripheral surface of the absorbent core 11 can be covered with a sheet member (core cover sheet 11b) having liquid permeability such as tissue paper or nonwoven fabric. The absorbent core 11 of the present embodiment has a narrowed portion 11c in which the width in the left-right direction is narrowed between the front side end and the rear side end in the length direction, and has a substantially hourglass shape in plan view as shown in FIG. 4A The narrowed portion 11c is a portion that is pinched between the legs of the wearer when the diaper 1 is worn, and the length in the left-right direction of this portion is shortened (the width is narrowed), whereby the absorbent core 11 becomes easy to fit to the crotch of the wearer.

[0068] The top sheet 12 is a liquid-permeable sheet, and uses, for example, a hydrophilic thermobonded nonwoven fabric, a spunbonded nonwoven fabric, or the like. In the present embodiment, as shown in FIG. 4B The left and right side portions in the left-right direction of the top sheet 12 are folded back toward the non-skin side to be wrapped around the absorbent core 11.

[0069] The bottom sheet 13 is a double-layer structure including a liquid-impermeable sheet 13a and an outer cover sheet 13b disposed on the non-skin side of the liquid-impermeable sheet 13a. As the liquid-impermeable sheet 13a, a sheet member having liquid-impermeability and having moisture permeability is used. For example, a micro-porous, air-permeable resin film in which a plurality of fine holes are provided in a sheet mainly made of a resin such as polyethylene, polypropylene, or the like can be used. In the present specification, the liquid-impermeable sheet 13a is also referred to as a "moisture-permeable film". That is, the moisture-permeable film is a sheet member having "leakage prevention" that does not allow liquid to pass through and having "moisture permeability" and "air permeability" that allows water vapor and air to pass through. On the other hand, as the outer cover sheet 13b, a hydrophobic nonwoven fabric having softness is used. For example, a thermobonded nonwoven fabric, a spunbonded nonwoven fabric, or the like can be used.

[0070] A pair of leakage prevention wall portions 15 is provided in the left and right side portions in the left-right direction of the absorbent main body 10 along the longitudinal direction (the length direction of the absorbent main body 10). In the present embodiment, the leakage prevention wall portions 15 are formed of the above-described outer cover sheet 13b. Specifically, in the left-right direction (the lateral direction), a portion of the outer cover sheet 13b extends outward beyond both ends of the absorbent core 11 and is folded back toward the non-skin side as shown in FIG. 4BAs shown, the diaper bends towards the skin at multiple points, thereby forming a pair of leak-proof wall portions 15. Leak-proof elastic members 16, such as rubber bands, are installed at the skin-side end (front end) of the leak-proof wall portions 15 in a longitudinally elongated state (the length direction of the absorbent body 10). When the diaper 1 is worn, based on the elasticity exhibited by the leak-proof elastic members 16, the leak-proof wall portions 15 stand upright towards the wearer's skin and conform to the wearer's crotch area.

[0071] Furthermore, elastic leg bands or other leg band members 17 are installed on both sides of the absorbent body 10 in a longitudinal (length direction) state. When the diaper 1 is worn, the elastic leg band members 17 exhibit elasticity, causing the sides of the absorbent body 10 to contract and easily conform to the wearer's leg circumference.

[0072] (Front waist 30)

[0073] like FIG. 3 As shown, the front waist section 30 has a skin side sheet 31 positioned closest to the skin side in the thickness direction, a non-skin side sheet 32 ​​stacked adjacent to the skin side sheet 31 on the non-skin side, and a waist elastic member 35 disposed between the skin side sheet 31 and the non-skin side sheet 32 ​​in the thickness direction. The front waist section 30, as an outer component of the diaper 1, is essentially a double-layered structure with the skin side sheet 31 and the non-skin side sheet 32. However, for example, the front waist section 30 may also have a structure with three or more layers in certain areas, such as the skin sheet 36 described later.

[0074] Skin side panel 31 and non-skin side panel 32 are as follows FIG. 2 The sheet components shown are rectangular in shape when viewed from above, and are formed, for example, from SMS nonwoven fabric. In diaper 1, the sheet component (nonwoven fabric) constituting the non-skin side panel 32 is more hydrophilic than the sheet component (nonwoven fabric) constituting the skin side panel 31. That is, the skin side panel 31 is formed from a nonwoven fabric with lower hydrophilicity, while the non-skin side panel 32 is formed from a nonwoven fabric with higher hydrophilicity than the skin side panel 31. Hereinafter, the nonwoven fabric forming the skin side panel 31 will be referred to as "hydrophobic nonwoven fabric," and the nonwoven fabric forming the non-skin side panel 32 will be referred to as "hydrophilic nonwoven fabric." The "hydrophilicity" of the nonwoven fabric will be explained later.

[0075] In addition, multiple such features are provided on the surface of the non-skin side sheet 32. FIG. 2The enlarged view shows the opening 32h. The opening 32h is a through-hole penetrating the non-skin side panel 32 in the thickness direction. By providing this opening 32h, the breathability of the front waist section 30 can be improved. Furthermore, the opening 32h is configured to be visually identifiable from the non-skin side of the front waist section 30, thereby easily reminding the user that the front waist section 30 has good breathability. Each opening 32h can, for example, be a circular shape with a diameter of approximately 1 mm, but the shape and arrangement (number and pattern) of the opening 32h can be appropriately changed. In addition, in the diaper 1, the skin side panel 31 does not have a through-hole equivalent to the opening 32h.

[0076] In this embodiment, the front waist portion 30 has a folded-back portion 32f, which is formed by folding back the upper end (front end in the longitudinal direction) of the non-skin side piece 32 from the non-skin side to the skin side and from the front to the rear in the longitudinal direction. This folded-back portion 32f covers a portion (upper end) of the skin side piece 31, thereby preventing the upper edge of the skin side piece 31 from sinking into the wearer's skin. However, the folded-back portion 32f may not necessarily be provided.

[0077] Multiple elastic waist members 35 are arranged vertically between the skin side panel 31 and the non-skin side panel 32, and are installed between the skin side panel 31 and the non-skin side panel 32 in a state of being extended in the lateral direction. Utilizing the elasticity of the elastic waist member 35, the front waist section 30 conforms to the wearer's abdominal waist.

[0078] The waist elastic member 35 can be installed using adhesives such as hot melt adhesives. For example, by applying hot melt adhesive to the waist elastic member 35, causing it to elongate at a predetermined elongation ratio, and clamping it between the skin side piece 31 and the non-skin side piece 32, the waist elastic member 35 can be installed. That is, the skin side piece 31 and the non-skin side piece 32 are joined by adhesive via the waist elastic member 35. Alternatively, the waist elastic member 35 can be installed by applying adhesive to both the skin side piece 31 and the non-skin side piece 32, or by using the welding method of the welding portion 60 described later.

[0079] Additionally, the front waist section 30 may also have a skin panel 36. For example... FIG. 3 As shown, the skin-covering sheet 36 is a sheet member disposed from the skin side, covering the upper end (front end in the longitudinal direction) of the absorbent body 10, and functions as a covering sheet. This prevents the upper edge of the absorbent body 10 from sinking into the wearer's skin when the diaper 1 is worn. The skin-covering sheet 36 is formed, for example, from SMS nonwoven fabric. Alternatively, the skin-covering sheet 36 may not necessarily be provided.

[0080] In the front waist portion 30 of the present embodiment, in the case where the sheet members are 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 configured to cover only a part of the skin-side sheet 31 and a part of the non-skin-side sheet 32. For example, FIG. 3 the skin-side sheet 31 is exposed to the skin side of the wearer.

[0081] (Rear waist portion 40)

[0082] The rear waist portion 40 has substantially the same structure as that of the front waist portion 30. That is, the rear waist portion 40 has a skin-side sheet 41 disposed at a position closest to the skin side in the thickness direction, a non-skin-side sheet 42 stacked on the non-skin side of the skin-side sheet 41 adjacent to the skin-side sheet 41, and a waist elastic member 45 provided between the skin-side sheet 41 and the non-skin-side sheet 42 in the thickness direction. Also, like the front waist portion 30, the rear waist portion 40 can have a hole portion 42h, a folded-back portion 42f, a skin-facing sheet 46, and the like (see FIG. 2 , FIG. 3 ). Since the structures of the members are substantially the same as those of the members of the front waist portion 30, the description is omitted.

[0083] On the other hand, the outer shape of the rear waist portion 40 is different from that of the front waist portion 30. Specifically, as shown in FIG. 2 , the rear waist portion 40 has a hip cover 40b that becomes a substantially trapezoidal shape at a position lower than the side joint portion 50 (side portion 40sw) in the vertical direction. The hip cover 40b is a position where the width in the lateral direction narrows from the upper side toward the lower side in the vertical direction, and the outer edge thereof is curved. By providing the hip cover 40b, it becomes possible for the rear waist portion 40 to more widely cover the hips of the wearer when the diaper 1 is worn.

[0084] Also, as shown in FIG. 2 , an elastic member 47 such as an elastic band is provided in the hip cover 40b. The elastic member 47 is installed between the skin-side sheet 41 and the non-skin-side sheet 42 in a state of being elongated along the end edge portion of the hip cover 40b, and by the stretchability exhibited by the elastic member 47, the hip cover 40b of the rear waist portion 40 becomes easy to fit to the hips of the wearer when the diaper 1 is worn, and in addition, the hip cover 40b becomes less likely to roll up from the hips.

[0085] (Post-treatment tape 80)

[0086] A post-treatment tape 80 used when the diaper 1 is disposed is provided on the non-skin side of the rear waist portion 40 of the diaper 1. FIG. 5This is a cross-sectional schematic diagram showing the post-treatment belt 80 located on the non-skin side of the rear waist 40. FIG. 6A This is a rough three-dimensional view of the diaper 1 with the post-processing belt 80 unfolded, viewed from the back side. FIG. 6B It means to FIG. 6A A schematic perspective view of a diaper 1 rolled up and disposed of. Furthermore, in... FIG. 5 In Figure 6, for ease of explanation, elastic member 45 and other components are omitted and the illustration is simplified.

[0087] like FIG. 2 As shown in Figure 6, the post-treatment tape 80 is a long, strip-shaped component extending in the vertical direction, which is adhered (bonded) to the non-skin side of the non-skin side panel 42 of the rear waist section 40 by an adhesive or the like. The post-treatment tape 80 includes a tape body 81, a tape holding part 82, a tape holding member 83, an adhesive part 84, and multiple tape adhesive parts 85. With the length and width directions of the rectangular post-treatment tape 80 aligned with the vertical (longitudinal) and horizontal (lateral) directions of the diaper 1, respectively, a tape holding part 82 is provided at one end 80e in the longitudinal direction of the post-treatment tape 80, and an adhesive part 84 is provided at the other end 80f in the longitudinal direction.

[0088] One end 80e of the post-processing band 80 passes through, as FIG. 6A As shown, it unfolds to extend towards the waist opening (BH side). When discarding diaper 1, to make it compact, for example, the two ends of the back waist section 40 in the left-right direction are folded towards the abdomen, and diaper 1 is rolled up from the crotch side towards the waist opening side, thus forming... FIG. 6B The state shown. At this time, by using the adhesive part 85 to adhere the post-treatment tape 80 to the portion 1p that extends beyond the waist opening BH, the diaper 1 can be maintained in a compact shape.

[0089] The other end 80f of the post-processing tape 80 is secured to the non-skin side (non-skin side piece 42) of the rear waist portion 40 by an adhesive portion 84 formed of adhesive. For the adhesive portion 84, it is preferable that even in situations such as... FIG. 6A Even when one end 80e is stretched when the post-processing tape 80 is unfolded as shown, the post-processing tape 80 will not detach from the rear waist part 40, that is, the adhesive part 84 will not peel off.

[0090] For example, such as FIG. 5As shown, the post-processing tape 80 in its unused state is folded into a Z-shape along its length. The tape body 81 is folded into a Z-shape, thus having three layers: a first layer 81x closest to the skin, a third layer 81z closest to the non-skin side, and a second layer 81y between the first and third layers. In the Z-shaped state, tape adhesive portions 85 with peelable adhesive strength are provided between the non-skin side of the first layer 81x and the skin side of the second layer 81y adjacent in the thickness direction, and between the non-skin side of the second layer 81y and the skin side of the third layer 81z adjacent in the thickness direction. That is, using the tape adhesive portions 85, the adhesion between the first layer 81x and the second layer 81y, and the adhesion between the second layer 81y and the third layer 81z, can be re-adhere after peeling.

[0091] The adhesive portion 85 is used to temporarily fix the unused post-treatment tape 80 into a Z-shaped folded state. Furthermore, the adhesive portion 85 does not necessarily need to cover the entire area between the non-skin side of the first layer 81x and the skin side of the second layer 81y, or between the non-skin side of the second layer 81y and the skin side of the third layer 81z. Each adhesive portion 85 only needs to have adhesive strength sufficient to temporarily fix the unused post-treatment tape 80 into a Z-shaped folded state, and the adhesive range can be arbitrary. Additionally, the adhesive portion 85 does not necessarily need to be entirely formed of adhesive. For example, the second layer 81y and the third layer 81z can be temporarily fixed by compression, pressing, or other methods instead of adhesive.

[0092] And, as FIG. 6A As shown by the double-dotted line, if the belt holding part 82 is stretched in the length direction (up and down direction), the tight fit between the surfaces formed by the belt adhesive part 85 is released, the post-processing belt 80 can be unfolded, and it can be extended to the upper waist opening part BH side.

[0093] The belt body 81 is a component that serves as the substrate for the post-processing belt 80, and examples of resin materials include polyethylene and polypropylene. In this embodiment, the belt body 81 uses a transparent resin material with smooth surfaces on both sides. The belt body 81 can be, for example, a pulp material such as paper, and is not limited to having smooth surfaces on both sides; for example, it can also be a fiber assembly such as nonwoven fabric or woven fabric. However, in order to maintain the folded Z-shaped state by the bonding of the belt adhesive portion 85 and to release the tight adhesion between the surfaces of the post-processing belts 80, it is more preferable to use a resin material such as polyethylene or polypropylene with smooth surfaces on both sides.

[0094] The belt holding portion 82 is a portion that a person who performs the post-treatment of the diaper 1 holds the post-treatment belt 80. The belt holding portion 82 is provided at the end portion of the post-treatment belt 80, and a belt holding member 83 is provided at the belt holding portion 82. In detail, the belt holding member 83 is fixed to the skin side of the belt main body 81 by an adhesive (not shown) or the like, and the outer peripheral surface of the belt holding portion 82 is not attached with the adhesive. The belt holding member 83 is a resin material such as colorless transparent polyethylene, polypropylene, or the like. With respect to the belt holding portion 82, for example, a portion in which the adhesive is not provided at the end portion 80e of the belt main body 81 can be used as the belt holding portion 82, or a portion in which the end portion 80e of the belt main body 81 is folded back toward the skin side and the belt main body 81 is attached to each other can be used as the belt holding portion 82.

[0095] Further, the post-treatment belt 80 of the diaper 1 itself is substantially inextensible in the longitudinal direction, but is not limited thereto. The belt main body 81 can be formed of an elastic material such as rubber and can have extensibility in the longitudinal direction. Furthermore, the post-treatment belt 80 can not necessarily be folded in the letter Z shape, and can be a folded letter V shape, a folded letter W shape, or a folded shape having a number of folds greater than that of the letter W shape.

[0096] <Hydrophilicity of Sheet Member>

[0097] Next, the hydrophilicity of the sheet member constituting the diaper 1 will be described. In the diaper 1, a hydrophobic nonwoven fabric is used as the skin side sheet 31, 41 constituting the outer cover member, i.e., the waist member 20 (front side waist portion 30, rear side waist portion 40), and the outer cover sheet 13b of the absorbent main body 10. On the other hand, a hydrophilic nonwoven fabric having higher hydrophilicity than the hydrophobic nonwoven fabric is used as the non-skin side sheet 32, 42 constituting the waist member 20.

[0098] The hydrophilic nonwoven fabric of the present embodiment is a nonwoven fabric in which the hydrophilicity is improved by performing a process (hydrophilic treatment) in which a predetermined oil agent is attached to a hydrophobic nonwoven fabric. As the oil agent used for the hydrophilic treatment, for example, a commercially available oil agent that is 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 the oil agent into an 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 can also be formed by a method other than this. For example, the hydrophilic nonwoven fabric can also be obtained by manufacturing a nonwoven fabric using a fiber having higher hydrophilicity.

[0099] In addition, in the present embodiment, the entire nonwoven fabric constituting the non-skin side sheet 32, 42 is subjected to hydrophilic treatment, and the hydrophilicity of the entire sheet member is improved. However, it is also possible to improve the hydrophilicity of only a part of the sheet member. For example, it is also possible to form a sheet member having a part with high hydrophilicity and a part with low hydrophilicity by subjecting only a part of the non-skin side sheet 32 to hydrophilic treatment or the like.

[0100] The hydrophilicity of the sheet member can be evaluated by measuring the contact angle when ion-exchanged water is brought into contact with the surface of the sheet member. Specifically, if the contact angle of the hydrophilic nonwoven fabric with ion-exchanged water is smaller than the contact angle of the hydrophobic nonwoven fabric with ion-exchanged water, the hydrophilicity of the hydrophilic nonwoven fabric is higher than the hydrophilicity of the hydrophobic nonwoven fabric. As the hydrophilic nonwoven fabric (non-skin side sheet 32 or the like) used in the present embodiment, the contact angle with ion-exchanged water is preferably less than 90°, and more preferably 50° or less. On the other hand, as the hydrophobic nonwoven fabric (skin side sheet 31), the contact angle with ion-exchanged water is preferably 90° or more, and more preferably 120° or more.

[0101] For example, the contact angle can be measured using a contact angle meter MCA-J manufactured by Kyowa Interface Science Co., Ltd. by the following method. First, ion-exchanged water (about 20 picoliters) is dropped on the surface of the fiber constituting the sheet member to be measured (measured sheet), and immediately thereafter, the contact angle is measured using the contact angle meter. The measurement is performed at a plurality of sites (for example, five or more sites) on the surface of the measured sheet, and the average value thereof is taken as the contact angle. In addition, the environmental temperature at the time of measurement is set to 22°C.

[0102] Alternatively, the contact angle can be measured by taking an image of the measured sheet on which ion-exchanged water is dropped from the cross-sectional direction of the measured sheet, analyzing the taken image, and measuring the angle formed by the droplet of ion-exchanged water and the measured sheet.

[0103] <Absorption and Transpiration of Water in Diaper 1>

[0104] In the diaper 1, by providing the non-skin side of the outer member (front waist portion 30, rear waist portion 40) with a hydrophilic nonwoven fabric having high hydrophilicity, it becomes possible to absorb moisture such as sweat from the wearer's skin and transpire the absorbed moisture to the atmosphere. FIG. 7A to FIG. 7C is a diagram illustrating the basic principle of the absorption and transpiration of water in the diaper 1. In this diagram 7, the cross section of the front waist portion 30 among the members constituting the diaper 1 is schematically illustrated.

[0105] First, as illustrated in the diagram 7, the hydrophilic nonwoven fabric 32 provided on the non-skin side of the outer member 30, 40 is in contact with the skin of the wearer, and sweat or the like is absorbed from the skin of the wearer. FIG. 7AAs shown, the skin side sheet 31 (hydrophobic nonwoven fabric) disposed on the skin side in the thickness direction of the front waist portion 30 is in contact with the skin of the wearer when the wearer wears the diaper 1. As described above, the skin side sheet 31 of the present embodiment is formed of an SMS nonwoven fabric containing melt-blown fibers having a smaller fiber diameter than the spun-bond fibers. Therefore, the skin side sheet 31 has a portion in which the fine melt-blown fibers are densely entangled and the distance between the fibers is narrowed. According to such a structure, capillary phenomenon occurs in the skin side sheet 31, and thus it becomes easy to absorb moisture such as sweat adhering to the skin of the wearer.

[0106] Next, as shown in FIG. 2, the skin side sheet 31 absorbs moisture from the skin of the wearer. As described above, the skin side sheet 31 is formed of a hydrophobic nonwoven fabric, and thus the moisture is difficult to be released to the atmosphere from the skin side sheet 31. Therefore, the moisture is likely to remain in the skin side sheet 31. FIG. 7B As shown, the moisture absorbed by the skin side sheet 31 is transferred to the non-skin side sheet 32 (hydrophilic nonwoven fabric) stacked 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 in contrast to this, the non-skin side sheet 32 is a hydrophilic nonwoven fabric, a difference in the degree of hydrophilicity (hydrophilic gradient) is generated between the two sheets, and the moisture is likely to move from the skin side sheet 31 having a lower degree of hydrophilicity to the non-skin side sheet 32 having a higher degree of hydrophilicity. Therefore, the moisture is difficult to remain on the side of the skin side sheet 31 in contact with the skin of the wearer, and the moisture is likely to remain on the side of the non-skin side sheet 32 not in contact with the skin of the wearer.

[0107] The moisture remaining in the non-skin side sheet 32 is transpired to the atmosphere from the non-skin side surface of the non-skin side sheet 32. In the diaper 1, the non-skin side sheet 32 is disposed on the surface of the absorbent main body 10 closest to the outside (non-skin side). That is, the non-skin side surface of the non-skin side sheet 32 becomes an interface with the atmosphere. Therefore, it is possible to efficiently transpire the moisture contained in the inside of the non-skin side sheet 32 to the outside of the diaper 1 from a wide range of the non-skin side surface. However, it is not necessary to dispose the hydrophilic nonwoven fabric on the entire surface of the outer member closest to the non-skin side. For example, it is possible to provide other members (for example, an adhesive article such as a back treatment tape 80) different from the non-skin side sheet 32 on a part of the surface of the outer member closest to the non-skin side.

[0108] Thus, in the outer member (waist member 20) of the diaper 1, the moisture absorbed from the skin of the wearer by the hydrophobic nonwoven fabric is transferred to the hydrophilic nonwoven fabric on the non-skin side, and is released to the atmosphere from the non-skin side surface of the hydrophilic nonwoven fabric. That is, it is possible to absorb the moisture and efficiently transpire it to the atmosphere. Thus, the moisture becomes difficult to contact the skin of the wearer, and it is possible to suppress the skin of the wearer from becoming damp and to cause skin problems such as rash or to cause the wearer to feel uncomfortable.

[0109] <Operation at the time of disposal of the diaper 1>

[0110] Next, a problem point occurring at the time of disposal after use of the diaper 1 will be described. As shown in FIG. 3, the skin side sheet 31 is formed of a hydrophobic nonwoven fabric, and thus the moisture is difficult to be released to the atmosphere from the skin side sheet 31. Therefore, the moisture is likely to remain in the skin side sheet 31. FIG. 6Aand FIG. 6B As described above, when the used diaper 1 is discarded, a post-treatment operation of fixing the post-treatment tape 80 is performed in a state where the post-treatment tape 80 is unfolded and the diaper 1 is rolled up with the absorbent main body 10, on which excretions are absorbed, inside. In the post-treatment operation, in order to unfold the post-treatment tape 80 in the folded state, an operation of stretching the tape holding portion 82 (one end portion 80e) toward the non-skin side is performed, but at this time, the adhesive portion 84 can be peeled off. That is, when the tape holding portion 82 is stretched, the post-treatment tape 80 (adhesive) can be peeled off from the non-skin side sheet 42 of the back waist portion 40.

[0111] FIG. 8A and FIG. 8B is a view that explains a main reason for the post-treatment tape 80 being peeled off in the post-treatment operation of the diaper 1.

[0112] FIG. 8A is a view that explains an effect of the adhesion of the adhesive portion 84 being reduced as the first main reason. As described above, in the post-treatment tape 80, the first layer 81x closest to the skin side in the tape main body 81 is attached to the non-skin side sheet 42 of the back waist portion 40 via the adhesive portion 84 formed by an adhesive. That is, the first layer 81x and the non-skin side sheet 42 are fixed to each other in a state of being opposed to each other by the adhesion of the adhesive portion 84. If the tape holding portion 82 (one end portion 80e) of the post-treatment tape 80 is stretched toward the non-skin side from this state, a force acts in a direction of peeling the first layer 81x (adhesive portion 84) of the tape main body 81 from the non-skin side sheet 42.

[0113] In the diaper 1, as the non-skin side sheet 42, a hydrophilic nonwoven fabric subjected to a hydrophilic treatment using a predetermined oil agent is used, and the non-skin side sheet 42 contains the oil agent. Therefore, due to the effect of the oil agent, the adhesive portion 84 sometimes becomes easy to be peeled off. That is, compared to the case where the adhesive portion 84 is attached to a nonwoven fabric (hydrophobic nonwoven fabric) that does not contain the oil agent, the adhesion of the adhesive portion 84 sometimes decreases. In this case, as shown in FIG. 8A , the adhesive portion 84 can be peeled off from the non-skin side surface of the non-skin side sheet 42 to cause the post-treatment tape 80 to be peeled off.

[0114] Next, FIG. 8B is a view that explains an effect of the binding between fibers of the hydrophilic nonwoven fabric as the second main reason. In general, a nonwoven fabric is formed by a plurality of fibers being entangled with each other, and the more the portions where each fiber is entangled with other fibers (also referred to as "interlacing points") are formed, the stronger the binding between the fibers becomes, and the more the nonwoven fabric becomes difficult to be broken. If the post-treatment tape 80 (adhesive) attached to the surface of such a nonwoven fabric is stretched toward the non-skin side in the post-treatment operation of the diaper 1, a force acts in a direction of peeling the adhesive portion 84 from the non-skin side sheet 42.

[0115] Also, when the post-treatment tape 80 is stretched, sometimes the bonding of the fibers constituting the nonwoven fabric to each other is cut and the nonwoven fabric is partially broken. For example, when a force is applied in a direction peeling the adhesive portion 84 from the non-skin side sheet 42 (hydrophilic nonwoven fabric), in a case where 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 adhesive portion 84, the non-skin side sheet 42 sometimes breaks. That is, as shown in FIG. 8, the entanglement (interweaving) of the fibers near the surface of the non-skin side sheet 42 to each other is undone, and the surface of the non-skin side sheet 42 near the surface can break and separate. As a result, the post-treatment tape 80 (adhesive portion 84) can peel from the non-skin side sheet 42. FIG. 8B

[0116] In view of such a problem, in the diaper 1 of the present embodiment, the length of the fibers constituting the non-skin side sheet 42 (hydrophilic nonwoven fabric) to which the post-treatment tape 80 is adhered is adjusted, whereby the peeling of the post-treatment tape 80 at the time of the post-treatment operation is suppressed.

[0117] FIG. 9 is a view explaining the relationship between the fibers constituting the non-skin side sheet 42 (hydrophilic nonwoven fabric) of the diaper 1 and the post-treatment tape 80. In the diaper 1 of the present embodiment, the non-skin side sheet 42 (hydrophilic nonwoven fabric) is configured to have fibers longer in length than the width dimension of the post-treatment tape 80 (adherend). Here, the width dimension of the adherend refers to the dimension of the smaller one of the longitudinal direction and the lateral direction of the adherend. In the diaper 1, in the case of the post-treatment tape 80 which is a longitudinal tape, the dimension in the lateral direction of the post-treatment tape 80 becomes the width dimension of the adherend.

[0118] In the case of FIG. 9 , the fiber length LfHy of a certain fiber fHy constituting the non-skin side sheet 42 (hydrophilic nonwoven fabric) as the adherend is longer than the dimension W80 in the lateral direction of the post-treatment tape 80 as the adherend (LfHy > W80). The longer the fiber length LfHy of the fiber fHy constituting the hydrophilic nonwoven fabric, the more the number of interweaving points with other fibers increases, and the fibers easily entangle with each other and the bonding force becomes strong, so the hydrophilic nonwoven fabric becomes less likely to break. Also, the fiber length LfHy is longer than the width W80 of the post-treatment tape 80, so the entanglement of the fibers to each other becomes easy in a wider range than the width W80 of the post-treatment tape 80. That is, since the interweaving points of the fibers are formed in a wider area than W80, even in the case where a force is applied in the direction in which the post-treatment tape 80 is stretched, the hydrophilic nonwoven fabric can be made less likely to break in the portion to which the post-treatment tape 80 is adhered. Thus, it is possible to make it less likely to occur that at least the FIG. 8B ​The peeling of the post-treatment tape 80 is caused by the weak bonding force between the fibers constituting the hydrophilic nonwoven fabric, as explained in the description. Therefore, the post-treatment tape 80 (adhesive) is less likely to peel off from the non-skin side sheet 42 (hydrophilic nonwoven fabric).

[0119] Furthermore, in FIG. 9 In this configuration, the fiber fHy is arranged in a direction orthogonal to the stretching direction (longitudinal) of the post-treatment tape 80 (adhesive). In other words, in the transverse direction, the left end fHyel of fiber fHy is positioned to the left of the left end 80el of the post-treatment tape 80, and the right end fHyer of fiber fHy is positioned to the right of the right end 80er of the post-treatment tape 80. In this case, the fiber fHy is more likely to have interlacing points with other fibers in the left-right direction in the area outer of the two ends 80el and 80er of the post-treatment tape 80. Therefore, in the hydrophilic nonwoven fabric, the interlacing of fibers becomes less likely to untangle in the two outer regions in the left-right direction of the portion where the post-treatment tape 80 is adhered, resulting in stronger bonding. Consequently, the hydrophilic nonwoven fabric becomes less prone to tearing under the stretching force applied to the post-treatment tape 80 (adhesive portion 84), and the detachment of the post-treatment tape 80 can be easily suppressed.

[0120] Furthermore, the arrangement direction of the fibers constituting the non-skin side sheet 42 (hydrophilic nonwoven fabric) is not limited to... FIG. 9 In such a transverse direction, a portion of the fibers may also be arranged in other directions (e.g., longitudinal). However, as mentioned above, if the fibers are arranged across the adhesive in a direction orthogonal to the direction in which the post-treatment belt 80 (adhesive) is stretched (longitudinal), (transverse) the hydrophilic nonwoven fabric is less prone to tearing. That is, the adhesive is less likely to peel off from the hydrophilic nonwoven fabric. Therefore, it is preferable that the fiber orientation of the hydrophilic nonwoven fabric is aligned with the direction orthogonal to the direction in which the post-treatment belt 80 (adhesive) is stretched (transverse). In other words, it is preferable that the number of fibers per unit volume arranged transversely across the adhesive is greater than the number of fibers per unit volume arranged longitudinally across the adhesive. With such a structure, the adhesive is even less likely to peel off.

[0121] In the diaper 1, the post-treatment tape 80 as the adherend to the non-skin-side sheet 42 (hydrophilic nonwoven fabric) is provided on the premise that it is stretched in the direction of peeling from the hydrophilic nonwoven fabric when the post-treatment operation after use of the diaper 1 is performed. Therefore, if the adhering portion 84 is simply peeled, the function of the post-treatment tape 80 is lost, and the user cannot comfortably perform the post-treatment operation. In contrast, in the present embodiment, as described above, the fiber length of the fiber constituting the hydrophilic nonwoven fabric and the orientation thereof and the arrangement of the post-treatment tape 80 are adjusted, whereby the post-treatment tape 80 is easily prevented from being detached from the non-skin-side sheet 42 (hydrophilic nonwoven fabric) when the post-treatment operation of the diaper 1 is performed. Therefore, it is possible to reduce the stress and discomfort of the user in relation to the post-treatment operation of the diaper 1.

[0122] In addition, in order to make the post-treatment tape 80 (adherend) less likely to be detached from the hydrophilic nonwoven fabric, the configuration of the post-treatment tape 80 itself can also be changed. FIG. 10 is a cross-sectional schematic view showing a modification of the post-treatment tape 80. FIG. 11A and FIG. 11B is a diagram showing the force acting on the post-treatment tape 80 of the modification when the post-treatment operation is performed.

[0123] FIG. 5 The post-treatment tape 80 described in the present embodiment is configured of one tape base material, i.e., the tape body 81, which is folded in the shape of the letter Z, but as shown in FIG. 10 , the post-treatment tape 80 of the modification is configured of two different tape base materials, i.e., the first member 86 and the second member 87 provided on the non-skin side of the first member 86. However, other base materials (e.g., a third member) other than these can also be provided. The structure other than the members 86 and 87 that become the tape base materials and the joint portion 88 that joins them is substantially the same as that of the post-treatment tape 80 described in the FIG. 5 .

[0124] The first member 86 and the second member 87 are both members in the shape of a tape formed of a resin material such as polyethylene or polypropylene, like the tape body 81 described above. The first member 86 is fixed to the non-skin-side sheet 42 (hydrophilic nonwoven fabric) of the rear waist portion 40 with the adhering portion 84. On the other hand, the second member 87 is folded in the shape of the letter V and has two layers, i.e., the first layer 87y on the skin side and the second layer 87z on the non-skin side. The first layer 87y and the second layer 87z are releasably adhered with the tape adhering portion 85. On the other hand, the first member 86 and the second member 87 are joined by the joint portion 88 formed of an adhesive or the like. In addition, the joint portion 88 is provided between the end portion on one side and the end portion on the other side in the longitudinal direction of the first member 86. In other words, the joint portion 88 is provided so as to be positioned on the non-skin side of the diaper 1 in the longitudinal direction of the diaper 1. FIG. 10The first member 86 is separated from the upper and lower ends of the first member 86 by a predetermined distance in the vertical direction. That is, as shown in FIG11, the upper end RU and the lower end RD of the first member 86 and the second member 87 have portions that are not joined to each other in the vertical direction.

[0125] When performing the post-treatment operation of diaper 1 using the modified post-treatment tape 80, firstly, the tape holding member 83 (one end 80e in the length direction) is stretched towards the non-skin side to peel off the tape adhesive portion 85, causing the post-treatment tape 80 to unfold in the length direction. At this time, as... FIG. 11A As shown, the second component 87 is positioned upright from the first component 86 toward the non-skin side, starting from the joint 88. When the second component 87 (with the holding component 83) is further stretched toward the non-skin side from this state, the length direction of the first component 86 (in...) FIG. 11A The portion between the two ends (where the joint 88 is located in the vertical direction) is stretched toward the non-skin side. Therefore, the tensile force on the first member 86 (adhesive portion 84) is distributed along the length direction with the joint 88 as the center.

[0126] FIG. 5 The post-processing tape 80 described herein is an integral tape body 81 folded into a Z-shaped structure. Therefore, during post-processing, if the tape holding member 83 (one end 80e) is stretched, the tensile force on the adhesive portion 84 is concentrated on the upper end (in the vertical direction) of the first layer 81x of the tape body 81. FIG. 5 (The middle part is the boundary between the first layer 81x and the second layer 81y). That is, the tensile force tends to concentrate at one part in the length direction of the adhesive part 84 (the upper end in the vertical direction). In contrast, in the post-processing tape 80 of the modified example, since the tensile force on the adhesive part 84 can be distributed in the length direction (vertical direction), the adhesive part 84 is less likely to peel off compared to the case where a large force acts on one part of the adhesive part 84.

[0127] If from FIG. 11A If the state further stretches the second component 87 (with the holding component 83) towards the non-skin side, then as FIG. 11B As shown, the portion of the first component 86 that is bonded to the second component 87 via the joint 88 is stretched toward the non-skin side. On the other hand, the end RU of the first component 86 on one side (upper side in the vertical direction) of the joint 88 and the end RD on the other side (lower side in the vertical direction) of the first component 86 are bonded to the non-skin side sheet 42 (hydrophilic nonwoven fabric) via the adhesive portion 84, and the portions of the end RU and the end RD are able to resist the tensile force.

[0128] That is, in FIG. 11BIn the first member 86, both side portions RU, RD in the length direction of the portion (portion of the joint portion 88) on which the tensile force of the second member 87 acts are provided with an adhesive portion (adhesive portion 84) that is bonded to the non-skin side sheet 42 (hydrophilic nonwoven fabric). Therefore, with respect to the tensile force acting on the first member 86, since the adhesive portion 84 of both portions on the sides thereof can resist the tensile force, the first member 86 can be more difficult to peel off. Thus, the post-treatment tape 80 becomes more difficult to separate from the non-skin side sheet 42 (hydrophilic nonwoven fabric), and the post-treatment operation of the diaper 1 can be more easily performed.

[0129] FIG. 12 is a plan view of the region B of FIG. 2 , which is a view that illustrates the state of the surface of the portion of the non-skin side sheet 42 to which the post-treatment tape 80 is adhered. As shown in this FIG. 12 , a plurality of compression portions 42e that compress 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 compression portions 42e are formed by performing so-called embossing processing when the hydrophilic nonwoven fabric is manufactured, and by providing such compression portions 42e, the strength of the hydrophilic nonwoven fabric can be improved. In FIG. 12 , each compression portion 42e is, for example, a circle with a diameter of about 0.5 mm, and is arranged in a lattice shape such that the interval G42e between adjacent compression portions 42e, 42e is about 2 mm. Thus, the non-skin side sheet 42 becomes more difficult to break, and the separation of the post-treatment tape 80 (adherend) described in FIG. 8B becomes more difficult to occur.

[0130] Further, it is preferable that the minimum value G42e of the interval between the plurality of compression portions 42e, 42e formed in the non-skin side sheet 42 (hydrophilic nonwoven fabric) be shorter than the fiber length LfHy of the fibers fHy that constitute the hydrophilic nonwoven fabric (G42e < LfHy). If the interval G42e is shorter than the fiber length LfHy, the likelihood that the compression portions 42e are formed at positions overlapping the fibers fHy increases. That is, the likelihood that the fibers fHy themselves are compressed when the compression portions 42e are formed increases. In the portion in which the fibers fHy are compressed, since the fibers fHy and other fibers become easy to be crimped, the binding force between the fibers becomes stronger than when the fibers are merely entangled with each other, and the hydrophilic nonwoven fabric becomes more difficult to break. Thus, the adherend can be made more difficult to peel off.

[0131] Further, it is preferable that at least one compression portion 42e be provided in a portion where the post-treatment tape 80 (adherend) overlaps the non-skin side sheet 42 (hydrophilic nonwoven fabric) when viewed in the thickness direction of the non-skin side sheet 42 (hydrophilic nonwoven fabric). As described above, in the portion provided with the compression portion 42e, the strength of the hydrophilic nonwoven fabric becomes high, and the nonwoven fabric becomes less likely to break. Therefore, by adhering the adherend to such a portion that is less likely to break, it is possible to easily suppress peeling of the adherend. In the present embodiment, as shown in FIG. 7, since a plurality of compression portions 42e are provided in the region where the post-treatment tape 80 is adhered (adhering portion 84), it is possible to make the post-treatment tape 80 less likely to come off. FIG. 12

[0132] At this time, it is more preferable that the width W80 of the post-treatment tape 80 (also the width of the adhering portion 84) be larger than the interval G42e between the compression portions 42e (W80 > G42e). If the width W80 of the post-treatment tape 80 is larger than the interval G42e between the compression portions 42e, it is more likely that at least one compression portion 42e, and further two or more compression portions 42e, be provided in the lateral direction (width direction) of the post-treatment tape 80. Therefore, as described above, in the portion where the post-treatment tape 80 (adherend) is adhered, the binding force between the fibers becomes strong, and the hydrophilic nonwoven fabric becomes less likely to break. Thus, it is possible to make the post-treatment tape 80 even less likely to come off.

[0133] Further, it is preferable that at least one opening portion 42h be provided in a portion where the post-treatment tape 80 (adherend) overlaps the non-skin side sheet 42 (hydrophilic nonwoven fabric) when viewed in the thickness direction of the non-skin side sheet 42 (hydrophilic nonwoven fabric). In the portion provided with the opening portion 42h, the adhesive that forms the adhering portion 84 is attached to the skin side sheet 41 (hydrophobic nonwoven fabric) provided on the skin side of the non-skin side sheet 42 (hydrophilic nonwoven fabric). That is, the case where the post-treatment tape 80 (adherend) and the hydrophobic nonwoven fabric not containing an oil agent are directly adhered in the portion of the opening portion 42h, compared to the case where the hydrophilic nonwoven fabric containing an oil agent is adhered, can enhance the adhesion. Therefore, compared to the case where the opening portion 42h and the adhering portion 84 do not overlap, it is possible to easily suppress peeling of the post-treatment tape 80 (adhering portion 84) from the back waist portion 40.

[0134]

[0135] ​​In the above-described embodiments, the waist elastic member 35, 45 is attached to the waist member 20 by an attachment method using a hot melt adhesive or the like, but the attachment method of the waist elastic member 35, 45 is not limited thereto. For example, the waist elastic member 35, 45 can be attached to the waist member 20 by a fusion method such as ultrasonic fusion. Further, since the ultrasonic fusion is a publicly known technology, the description of the ultrasonic fusion is omitted in the present specification.

[0136] FIG. 13A and FIG. 13B is a view for explaining a method of attaching the waist elastic member 35 to the front waist portion 30 using the fusion portion 60. In the present modification example, the waist elastic member 35 is attached to the front waist portion 30 by a plurality of fusion portions 60, 60,... arranged dispersedly in the left-right direction and the up-down direction. Each of the fusion portions 60 is formed in a substantially rectangular shape by ultrasonic fusion, 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. Further, the waist elastic member 35 is attached to the front waist portion 30 by sandwiching the waist elastic member 35 from both sides in the up-down direction with a pair of fusion portion pairs 60s each composed of two fusion portions 60, 60 adjacent in the up-down direction.

[0137] As shown in FIG. 13A , the pair of fusion portions 60, 60 constituting the fusion portion pair 60s are arranged at intervals GH60 in the up-down direction. Further, the size of the interval GH60 is set to be the same as or slightly larger than the size of the diameter d35t of the waist elastic member 35 in a state of being stretched to a predetermined stretch ratio (GH60 ≥ d35t). That is, the waist elastic member 35 in the stretched state is arranged between the fusion portion pairs 60s in the up-down direction.

[0138] Next, as shown in FIG. 13B , if the waist elastic member 35 is relaxed from the stretched state, the waist elastic member 35 contracts in the left-right direction and expands in the up-down direction, and the diameter d35 in the natural state thereof becomes larger than the interval GH60 of the fusion portion pairs 60s in the up-down direction (d35 > GH60). Thus, the waist elastic member 35 becomes a state of being sandwiched and pressed in the up-down direction by the fusion portions 60, 60. As a result, the waist elastic member 35 is attached to the front waist portion 30.

[0139] Further, in FIG. 1In the diaper 1 in the short pants type state, the waist elastic member 35 (45) is in a natural state in which it is relaxed from the above-mentioned stretched state. In addition, in the diaper 1 in the short pants type state, the waist elastic member 35 (45) is joined to the front waist portion 30 (the rear waist portion 40) by the side joints 50, 50 on both left and right side portions. Therefore, when the diaper 1 is worn, even if the front waist portion 30 (the rear waist portion 40) is stretched in the left and right direction, the waist elastic member 35 (45) does not come off from the waist member 20.

[0140] == Second Embodiment ==

[0141] In the second embodiment, a short pants type diaper 2 (hereinafter also referred to as "diaper 2") in which a part of the structure is different from the first embodiment is described. FIG. 14A is a plan view of the diaper 2 in an unfolded and stretched state. FIG. 14B is a D-D line cross-sectional view of the diaper 2. In addition, FIG. 14A is a D-D line cross-sectional view of the diaper 2. In addition, FIG. 14A and FIG. 14B each direction (for example, the longitudinal direction, the lateral direction, and the like) in the diaper 2 is the same as each direction defined in the first embodiment.

[0142] The diaper 2 of the second embodiment has the liquid-absorbent absorbent main body 10 and the waist member 20 as an outer cover member joined to the non-skin side of the absorbent main body 10. Also, as shown in FIG. 14A and FIG. 14B , the waist member 20 of the diaper 2 is continuously and integrally constituted in the longitudinal direction (the length direction of the absorbent main body 10). That is, the diaper 2 is a so-called two-piece disposable diaper constituted by two members of the absorbent main body 10 and the outer cover member (the waist member 20). Hereinafter, a part of the outer cover member (the waist member 20) of the diaper 2 on the front side of the central position CL in the longitudinal direction is described as the front waist portion 30 and a part on the rear side of the central position CL is described as the rear waist portion 40 (see FIG. 14A ).

[0143] In the diaper 2 in the unfolded state of FIG. 14A , the absorbent main body 10 and the waist member 20 are folded at the central position CL in the longitudinal direction as a folding position. The front waist portion 30 and the rear waist portion 40 opposite to each other in the folded state are joined and linked to each other via the side portions 30sw and the side portions 40sw on both left and right sides, thereby forming a pair of side joints 50, 50. Thus, as with the diaper 1 of FIG. 1 , the diaper 2 becomes a short pants type state having a waist opening BH and a pair of leg opening LH, LH.

[0144] In the diaper 2, since the basic structure and function of the absorbent main body 10 are substantially the same as those of the diaper 1 of the first embodiment, the description thereof is omitted. However, the bottom sheet 13 of the diaper 2 can also have only the liquid- impermeable sheet 13a (air-permeable film) without the outer wrapping sheet 13b. This is because, in the diaper 2, the waist member 20 is provided on the entire non-skin side of the absorbent main body 10, and the waist member 20 has a function as an outer wrapping sheet of the absorbent main body 10. Therefore, the bottom sheet 13 of the absorbent main body 10 of the diaper 2 can also not be provided with a sheet member corresponding to the outer wrapping sheet 13b of the diaper 1 (see FIG. 14B ).

[0145] The waist member 20 has a skin side sheet 21, a non-skin side sheet 22 laminated to the non-skin side of the skin side sheet 21 adjacent to the skin side sheet 21, and waist elastic members 35, 45 disposed between the skin side sheet 21 and the non-skin side sheet 22 in the thickness direction (see FIG. 14B ). The skin side sheet 21 is a hydrophobic nonwoven fabric, like the skin side sheets 31, 41 of the diaper 1. The non-skin side sheet 22 is a hydrophilic nonwoven fabric, like the non-skin side sheets 32, 42 of the diaper 1. That is, in the diaper 2, the non-skin side sheet 22 is a nonwoven fabric having a higher hydrophilicity than the skin side sheet 21. Also, like the diaper 1, the waist elastic members 35, 45 are composed of rubber bands or the like, and are attached between the skin side sheet 21 and the non-skin side sheet 22 in a stretched state in the left-right direction.

[0146] Also, the non-skin side sheet 22 (hydrophilic nonwoven fabric) of the rear waist portion 40 of the diaper 2 has a rear processing tape 80 (adherend) used when performing a rear processing operation of the diaper 2 adhered thereto. Since the function and structure of the rear processing tape 80 are substantially the same as those of the rear processing tape 80 described in the first embodiment, the description thereof is omitted (see FIG. 5 and FIG. 10 , etc.).

[0147] The same effects as those of the diaper 1 can also be obtained in the diaper 2 of the second embodiment. That is, in the diaper 2, the hydrophilic nonwoven fabric of the non-skin side sheet 22 constituting the back waist portion 40 has fibers having a length longer than the dimension of the longitudinal direction and the transverse direction of the post-treatment tape 80 (adherend) in the dimension smaller one. If such a structure is adopted, the plurality of fibers constituting the hydrophilic nonwoven fabric easily entangle with each other, and the bonding force becomes strong, so that the hydrophilic nonwoven fabric becomes less likely to be broken. In addition, the fibers have a length longer than the width of the post-treatment tape 80, so that outside the region to which the post-treatment tape 80 is adhered, the fibers also easily entangle with each other, so that even if the post-treatment tape 80 is stretched, the hydrophilic nonwoven fabric becomes less likely to be broken against the stretching force. Thus, the post-treatment tape 80 (adherend) can be made less likely to be peeled from the non-skin side sheet 22 (hydrophilic nonwoven fabric). In addition, the diaper 2 has substantially the same features as those of the diaper 1 described in the first embodiment.

[0148] == Third Embodiment ==

[0149] In the third embodiment, a pair of shorts-type diaper 3 (hereinafter also referred to as "diaper 3") having a structure partly different from the above-described embodiments is described. FIG. 15A is a plan view of the diaper 3 in an unfolded and elongated state. FIG. 15B is a schematic cross-sectional view at the E-E line of FIG. 15A . In addition, FIG. 15A and FIG. 15B each direction (e.g., the longitudinal direction, the transverse direction, etc.) in

[0150] The diaper 3 of the third embodiment has a liquid-absorbent absorbent main body 10 and a waist member 20 as an outer member joined to the non-skin side of the absorbent main body 10. As shown in FIG. 15A and FIG. 15B , the waist member 20 of the diaper 3 is continuously and integrally constituted in the longitudinal direction (the length direction of the absorbent main body 10). That is, the skin side sheet 21 is constituted as a sheet member continuously and integrally from the end portion on one side to the end portion on the other side in the longitudinal direction. On the other hand, the front non-skin side sheet 32 disposed on the front side in the longitudinal direction and the back non-skin side sheet 42 disposed on the back side in the longitudinal direction are constituted as different sheet members discontinuous in the longitudinal direction. The diaper having such a configuration is also referred to as a simple 3-sheet disposable diaper. In the following, the portion of the outer member (the waist member 20) of the diaper 3 on the front side from the central position CL in the longitudinal direction is referred to as the front waist portion 30, and the portion on the back side from the central position CL is referred to as the back waist portion 40 (see FIG. 15A ).

[0151] In the diaper 3,FIG. 15A The diaper 3 in the unfolded state is formed into a short pants type by folding the absorbent main body 10 and the waist member 20 with the central position CL in the longitudinal direction as a folding position. The front waist portion 30 and the rear waist portion 40 opposite to each other in the folded state are joined to each other via the side portions 30sw and 40sw on both sides in the lateral direction, thereby forming a pair of side joint portions 50, 50. Thus, as with the diaper 1 of the first embodiment, the diaper 3 becomes a short pants type state having a waist opening BH and a pair of leg opening LH, LH. FIG. 1 As with the diaper 1 of the first embodiment, the diaper 3 becomes a short pants type state having a waist opening BH and a pair of leg opening LH, LH.

[0152] In the diaper 3, since 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 of the second embodiment, the description thereof is omitted.

[0153] The front waist portion 30 of the outer cover member (waist member 20) of the diaper 3 has a single 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 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 waist 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 has the 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 (dorsal 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.

[0154] The skin side sheet 21 is a hydrophobic nonwoven fabric as with the skin side sheets 31, 41 of the diaper 1. The non-skin side sheets 32, 42 are hydrophilic nonwoven fabrics as with the non-skin side sheets 32, 42 of the diaper 1. That is, in the diaper 3, the non-skin side sheets 32, 42 are nonwoven fabrics having higher hydrophilicity than the skin side sheet 21. Also, as with the diaper 1, the waist elastic members 35, 45 are composed of rubber bands or the like, which are attached between the skin side sheet 21 and the non-skin side sheets 32, 42 in a stretched state in the lateral direction.

[0155] Also, the non-skin side sheet 42 (hydrophilic nonwoven fabric) of the rear waist portion 40 of the diaper 3 has a post-processing tape 80 (adhesive material) used when performing a post-processing operation of the diaper 3 adhered thereto. Since the function and structure of the post-processing tape 80 are substantially the same as those of the post-processing tape 80 described in the first embodiment, the description thereof is omitted (see FIG. 5 and FIG. 10 etc.).

[0156] The same effects as the diaper 1 can also be obtained in the diaper 3 of the third embodiment. That is, in the diaper 3, the hydrophilic nonwoven fabric of the non-skin side sheet 42 constituting the back waist portion 40 has fibers with a length longer than the dimension of the longitudinal direction and the dimension of the transverse direction of the post-treatment tape 80 (the adherend) that is smaller. If this structure is adopted, the plurality of fibers constituting the hydrophilic nonwoven fabric easily entangle with each other, and the bonding force becomes strong, so the hydrophilic nonwoven fabric becomes less likely to break. In addition, the fibers have a length longer than the width of the post-treatment tape 80, so outside the region where the post-treatment tape 80 is adhered, the fibers also easily entangle with each other, so even if the post-treatment tape 80 is stretched, the hydrophilic nonwoven fabric becomes less likely to break against the stretching force. Thus, the post-treatment tape 80 (the adherend) can be made less likely to peel from the non-skin side sheet 42 (the hydrophilic nonwoven fabric). In addition, the diaper 3 has substantially the same features as the diaper 1 described in the first embodiment.

[0157] == Fourth Embodiment ==

[0158] In the fourth embodiment, as one example of an absorbent article, a "belt-type diaper" (hereinafter also referred to as "diaper 4") different from the "shorts-type diaper" described in the first to third embodiments is described. FIG. 16A is a plan view of the diaper 4 in an unfolded and elongated state. FIG. 16B is a cross-sectional view of the diaper 4 taken along the F-F line of FIG. 16A . In addition, FIG. 16A and FIG. 16B the directions (e.g., the longitudinal direction, the transverse direction, etc.) in

[0159] As shown in FIG. 16A and FIG. 16B , the diaper 4 has an absorbent core 11 that absorbs excretions, a top sheet 12 that is liquid-permeable and is 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 outer cover 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 at both sides in the left-right direction of the top sheet 12. In addition, leg elastic members 17 (e.g., rubber bands, etc.) that stretch and contract in the longitudinal direction are arranged at both sides in the left-right direction of the diaper 4.

[0160] The absorbent core 11, the top sheet 12, and the liquid-impermeable sheet 13a of the diaper 4 are portions corresponding to the absorbent main body 10 of the diaper 1, and each has the same function as the function of the absorbent core 11, the top sheet 12, and the liquid-impermeable sheet 13a that constitute the absorbent main body 10 of the diaper 1. For example, the liquid-impermeable sheet 13a is a gas-permeable film that allows moisture such as urine absorbed by the absorbent core 11 to permeate as water vapor.

[0161] The outer cover sheet 25 of the diaper 4 is an outer cover member corresponding to the waist member 20 of the diaper 1, and is formed of a hydrophilic nonwoven fabric like the non-skin side sheet 32, 42 that constitutes the waist member 20 of the diaper 1. In addition, the outer cover member of the diaper 4 can have the same structure as the structure of the waist member 20 of the diaper 1. For example, a hydrophobic nonwoven fabric (not illustrated in FIG. 1) can be provided adjacent to the skin side of the outer cover sheet 25 formed of a hydrophilic nonwoven fabric, and the outer cover member of the diaper 4 can be constituted by two sheet members. FIG. 16B

[0162] Hereinafter, for the purpose of facilitating the explanation, the portion of the diaper 4 on the front side of the central position CL in the longitudinal direction will also be referred to as the front waist portion 30, and the portion on the rear side of the central position CL will be referred to as the rear waist portion 40 (see FIG. 1). FIG. 16A

[0163] The pair of side sheets 18 is a nonwoven fabric having the same liquid permeability as the top sheet 12, and a leakage-preventing wall elastic member 16 that can stretch and contract in the longitudinal direction is provided at the inner side end portion of the side sheet 18 in the left-right direction. In the diaper 4, the inner side end portion of the side sheet 18 in the left-right direction stands up toward the skin side of the wearer based on the contraction force exhibited by the leakage-preventing wall elastic member 16, and a leakage-preventing wall portion 15 is formed like the diaper 1.

[0164] A pair of hook-and-loop fastener tapes 26 that extend to both outer sides in the left-right direction is provided on the back side (the rear waist portion 40) in the longitudinal direction of the diaper 4. In addition, a planar fastener 26f having a plurality of hook members (not illustrated) is provided on the skin side of the free end side (the outer side in the left-right direction) of the hook-and-loop fastener tape 26. Further, a target sheet 27 for engaging the hook-and-loop fastener tape 26 when the diaper 4 is worn is provided on the non-skin side of the front side (the front waist portion 30) in the longitudinal direction of the diaper 4. The target sheet 27 is a member that can engage with the planar fastener 26f (hook member) of the hook-and-loop fastener tape 26, and is formed of a nonwoven fabric, for example.

[0165] ​​Furthermore, a back elastic member 19 that stretches in the left-right direction (lateral direction) is provided on the back side (back waist portion 40) of the diaper 4 along its longitudinal direction. The back elastic member 19 is a strip-shaped elastic member made of stretchable non-woven fabric or the like, which is installed on the diaper 4 in a stretched state in the left-right direction. Utilizing the stretching force exhibited by this back elastic member 19, the diaper 4 easily conforms to the wearer's waist when worn.

[0166] Furthermore, a finishing strip 80 (adhesive) for performing finishing operations on the diaper 4 is attached to the outer cover 25 (hydrophilic nonwoven fabric) on the back waist section 40 of the diaper 4. Since the function and structure of the finishing strip 80 are substantially the same as those described in the first embodiment, a description is omitted (see [reference]). FIG. 5 as well as FIG. 10 wait).

[0167] When wearing diapers 4, for example, FIG. 16A The diaper 4, in its unfolded state, is positioned under the wearer's crotch, with the front waist section 30 fitted against the wearer's abdomen and the back waist section 40 fitted against the wearer's back (buttocks). Then, a pair of hook and loop fasteners 26, 26 are wrapped around the wearer's waist from the back to the abdomen, and the hook and loop fasteners 26f are engaged with the target piece 27 on the wearer's abdomen. This creates a waist opening BH that is approximately the same as that of the diaper 1, as well as a pair of leg openings LH, LH, allowing the diaper 4 to be secured in position relative to the wearer's body (crotch).

[0168] Furthermore, the target piece 27 may not necessarily be provided in the diaper 4. For example, the diaper 4 can be worn by directly fastening the face-shaped fastener 26f to the non-woven fabric constituting the outer cover 25, instead of placing the target piece 27 on the non-skin side of the outer cover 25.

[0169] The same effects as diaper 1 can also be obtained in diaper 4 of the fourth embodiment. That is, in diaper 4, the hydrophilic nonwoven fabric constituting the outer sheet 25 of the rear waist portion 40 has fibers having a length longer than the dimension of the smaller one of the longitudinal direction and the lateral direction of the after-treatment tape 80 (the adherend). If this structure is adopted, the plurality of fibers constituting the hydrophilic nonwoven fabric easily entangle with each other, and the bonding strength becomes strong, so the hydrophilic nonwoven fabric becomes less likely to break. In addition, the fibers have a length longer than the width of the after-treatment tape 80, so outside the region where the after-treatment tape 80 is adhered, the fibers also easily entangle with each other, so even if the after-treatment tape 80 is stretched, the hydrophilic nonwoven fabric becomes less likely to break against the stretching force. Thus, the after-treatment tape 80 (the adherend) can be made less likely to peel off from the outer sheet 25 (the hydrophilic nonwoven fabric). In addition, diaper 4 has substantially the same features as diaper 1 explained in the first embodiment.

[0170] ==Other Embodiments==

[0171] The embodiments of the present application described above are intended to be illustrative only and are not intended to limit the scope of the present application. It will be apparent to those skilled in the art that various modifications, improvements, and alterations can be made to the present application without departing from the spirit thereof. The present application includes all such modifications, improvements, and alterations.

Claims

1. An absorbent article having an absorbent main body having liquid absorbency and an outer cover member provided at a position on a non-skin side from the absorbent main body, characterized in that, the outer cover member has a hydrophilic nonwoven fabric containing a hydrophilic oil agent on the non-skin side, the hydrophilic nonwoven fabric has an adherent adhered by an adhesive on a surface on the non-skin side of the hydrophilic nonwoven fabric, the hydrophilic nonwoven fabric has fibers having a length longer than a dimension of either of a longitudinal direction of the adherent and a transverse direction orthogonal to the longitudinal direction, the longitudinal direction is a direction in which the adherent is stretched with respect to the hydrophilic nonwoven fabric, and the fibers are arranged across the transverse direction of the adherent.

2. The absorbent article according to claim 1, characterized in that, the hydrophilic nonwoven fabric has a plurality of the fibers, and a number of the fibers arranged across the transverse direction of the adherent is larger than a number of the fibers arranged across the longitudinal direction of the adherent.

3. The absorbent article according to claim 1 or 2, characterized in that, the hydrophilic nonwoven fabric has a plurality of compressed portions in which the hydrophilic nonwoven fabric is compressed in a thickness direction.

4. The absorbent article according to claim 3, characterized in that, the fibers have a length longer than a minimum value of intervals of adjacent two of the compressed portions.

5. The absorbent article according to claim 3, characterized in that, at least one of the compressed portions is provided in a region in which the adherent and the hydrophilic nonwoven fabric overlap when viewed in the thickness direction of the outer cover member.

6. The absorbent article according to claim 3, characterized in that, a dimension of either of the longitudinal direction of the adherent and the transverse direction is larger than the minimum value of the intervals of the adjacent two of the compressed portions.

7. The absorbent article according to claim 1 or 2, characterized in that, the outer cover member has a hydrophobic nonwoven fabric having a hydrophilicity lower than a hydrophilicity of the hydrophilic nonwoven fabric at a position on a skin side from the hydrophilic nonwoven fabric.

8. The absorbent article according to claim 7, characterized in that, the hydrophilic nonwoven fabric has a plurality of opening portions through the hydrophilic nonwoven fabric in a thickness direction, and at least one of the opening portions is provided in a region in which the adherent and the hydrophilic nonwoven fabric overlap when viewed in the thickness direction of the outer cover member.

9. The absorbent article according to claim 1 or 2, characterized in that, the adherent is a post-processing tape for maintaining the absorbent article in a compact form after the absorbent article is used.

10. The absorbent article according to claim 9, characterized in that, the post-processing tape has: a first member adhered to the hydrophilic nonwoven fabric; and a second member joined to a non-skin side of the first member by a joining portion provided between an end portion on one side and an end portion on the other side in a length direction of the first member.

11. The absorbent article according to claim 10, characterized in that, ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The portion of the first member on one side of the joint in the length direction and the portion of the first member on the other side of the joint in the length direction are respectively attached to the hydrophilic nonwoven fabric.

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