Absorbent articles

Abstract

To provide an absorbent article which hardly causes problems when putting on or taking off the garment and can suppress skin troubles. [Solution] The absorbent article 1 comprises an abdominal part 3 covering the abdomen of the wearer, a back part 2 covering the back, and an absorbent main body 4 covering the crotch area and including an absorbent body 8. The abdominal part and the back part comprise inner sheets 31, 21 constituting a skin contact surface, and outer sheets 32, 22 located on the non-skin side of the inner sheet. At least one of the abdominal part and the back part comprises a separate sheet 50 located between the outer sheet and the inner sheet, a plurality of elastic members 13, 12 located between the outer sheet and the separate sheet, joined to the outer sheet and the separate sheet, and extending along the width direction, a non-jointed region 52 located longitudinally inward of the waist region and where the inner sheet and the separate sheet are not joined, and a joined region 53 adjacent to the non-jointed region and where the inner sheet and the separate sheet are joined.

Description

[Technical field]

[0001] The present invention relates to absorbent articles. [Background technology]

[0002] A technique for suppressing skin troubles that may occur due to contact between an absorbent article and the skin has been disclosed.

[0003] For example, Patent Document 1 discloses a pants-type absorbent article that can suppress the rough texture caused by gathers formed in the waist opening area and the resulting pain to the skin. In this absorbent article, the outer layer sheet that forms the outermost surface of the article is folded back at the edge of the waist opening area to the skin-facing side, and the folded part and the outer layer sheet facing it are joined at a linear joint formed so as to extend around the waist, thereby forming a sleeve part that extends around the waist. Within the sleeve part, an elastically stretchable waistband that extends around the waist is arranged with one side facing the skin-facing side and the other side facing outward. The skin-facing side of the waistband is joined to the inner surface of the sleeve part, and the outer surface side is not joined to the inner surface of the sleeve part. The outer layer sheet used is stretchable at least in the waist direction.

[0004] For example, Patent Document 2 discloses a bubble-waist disposable diaper intended to improve the flexibility of the disposable diaper and reduce friction between the disposable diaper and the skin of the wearer. This disposable diaper includes a pants body (10), and an elastic waistline is formed at the upper part of the pants body (10). This elastic waistline (20) is provided with at least two waist bubble-shaped bulky portions (23) from top to bottom. At least one pair of side bubble-shaped bulky portions (24) is provided on both sides of the crotch part of the pants body (10). The side bubble-shaped bulky portions (24) are located below the waist bubble-shaped bulky portions (23). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2009-142498 A [Patent Document 2] China Utility Model No. 221600425 Specification Summary of the Invention [Problem to be solved by the invention]

[0006] In addition to the waist opening area, other gathers such as gathers at the waist circumference are present in the waist circumference of the absorbent article (pants-type absorbent article). Such other gathers may also cause pain to the skin. However, Patent Document 1 does not address such other gathers. As a method for suppressing the skin pain that may be caused by other gathers, a method of adjusting the stress of the elastic member that constitutes the gathers is considered. However, even if the stress is adjusted, the elastic member is still present and the gathers do not disappear, so there is still a risk of skin injury for infants with sensitive skin and those with skin diseases.

[0007] In Patent Document 2, the contact between the absorbent article and the skin is improved by providing bulky parts on the inside and outside of the waist circumference. However, according to the study of the inventor, it has been found for the first time that the following problems may occur. First, the presence of the bulky parts on the outside makes it easier to grip and pull up the absorbent article when it is worn, but the material of the bulky parts is thin and may tear. In that case, there is a concern that excrement may leak. Furthermore, since friction between the bulky parts and clothing increases, there is a risk that the absorbent article may be removed at once together with the clothing when the absorbent article is removed. In that case, the excrement on the skin side of the absorbent article is inadvertently exposed, and there is a concern that the excrement in the absorbent article may adhere to clothing or scatter around.

[0008] SUMMARY OF THE PRESENT DISCLOSURE An object of the present invention is to provide an absorbent article which is unlikely to cause problems when putting on or taking off the garment and which can prevent skin troubles. [Means for solving the problem]

[0009] The absorbent article of the present invention has a longitudinal direction, a width direction and a thickness direction which are mutually perpendicular when it is deployed, and comprises an abdominal portion which covers the abdomen of the wearer, a back portion which covers the back portion, and an absorbent body which covers the crotch portion and includes an absorbent body, the absorbent body having front and rear ends in the longitudinal direction which extend to the central portions in the width direction of the abdominal portion and the back portion, respectively, and each of the abdominal portion and the back portion comprises an inner sheet which constitutes a skin contact surface, and an outer sheet which is located on the non-skin side of the inner sheet, At least one of the abdominal side portion and the back side portion is an absorbent article including: a separate sheet located between the outer sheet and the inner sheet; a plurality of elastic members located between the outer sheet and the separate sheet, joined to the outer sheet and the separate sheet, and extending along the width direction; a non-bonded region located inside the waist region in the longitudinal direction, where the inner sheet and the separate sheet are not bonded; and a bonded region adjacent to the non-bonded region, where the inner sheet and the separate sheet are bonded. Effect of the Invention

[0010] According to the present invention, it is possible to provide an absorbent article that is less likely to cause problems when putting on or taking off the absorbent article and that can prevent skin troubles. [Brief description of the drawings]

[0011] [Figure 1] 1 is a plan view showing an example of a configuration of an absorbent article according to an embodiment in an unfolded state. [Diagram 2] 2 is a cross-sectional view taken along a longitudinal center line CL in FIG. 1. [Diagram 3] 2 is a cross-sectional view taken along a width direction center line CW in FIG. 1. [Figure 4] 2 is a plan view showing the non-bonded regions and bonded regions in FIG. 1 in an unfolded state. FIG. [Diagram 5] 5 is a cross-sectional view taken along a longitudinal center line CL in FIG. 4. [Figure 6] 5 is a cross-sectional view showing a longitudinal end portion of the leg gather portion in FIG. 4. FIG. [Figure 7] FIG. 2 is a plan view in a developed state showing an application example of the moisturizing agent in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] The present embodiment relates to the following aspects.

[0013] [Aspect 1] an absorbent article having a longitudinal direction, a width direction and a thickness direction which are mutually perpendicular in an unfolded state, and comprising an abdominal portion covering the abdomen of a wearer, a back portion covering the back, and an absorbent main body covering the crotch portion and including an absorbent body, the absorbent main body having front and rear ends in the longitudinal direction which extend to central portions in the width direction of the abdominal portion and the back portion, respectively, and each of the abdominal portion and the back portion comprises an inner sheet which constitutes a skin contact surface, and an outer sheet which is located on the non-skin side of the inner sheet, and at least one of the back portion and the back side portion includes a separate sheet located between the outer sheet and the inner sheet, a plurality of elastic members located between the outer sheet and the separate sheet, joined to the outer sheet and the separate sheet, and extending along the width direction, a non-jointed region located more inward in the longitudinal direction than the waist region, where the inner sheet and the separate sheet are not joined, and a joined region adjacent to the non-jointed region, where the inner sheet and the separate sheet are joined.

[0014] In this absorbent article, a separate sheet is provided between the outer sheet and the inner sheet in the ventral side and / or dorsal side, an elastic member is provided between the outer sheet and the separate sheet and joined to both sheets, and a non-jointed area and a joined area are provided between the inner sheet and the separate sheet longitudinally inward of the waist region. Therefore, on the side of the inner sheet (skin-facing side), the separate sheet and the inner sheet are joined in the joining region, so that the contraction of the elastic member causes the separate sheet to contract, which in turn causes the inner sheet to contract and form gathers. On the other hand, in the non-joining region, the separate sheet and the inner sheet are not joined, so even if the separate sheet contracts due to the contraction of the elastic member, this contraction is unlikely to be transmitted to the inner sheet that constitutes the skin-contacting surface. Therefore, gathers are unlikely to form on the inner sheet, and therefore wrinkles are unlikely to occur on the skin-contacting surface. In this way, on the inside in the longitudinal direction from the waist region, In the non-bonded area On the skin contact surface side, gathers are unlikely to form on the inner sheet, and wrinkles are unlikely to form on the skin contact surface, so pressure marks from the gathers are unlikely to appear on the wearer's skin corresponding to the non-bonded areas. As a result, the absorbent article can prevent skin troubles. In addition, on the side of the outer sheet (the side facing away from the skin), the outer sheet and the separate sheet are joined together with an elastic member, so the outer sheet is less likely to tear when put on and friction with clothing is less likely to increase, making it less likely to cause problems when putting on and taking off the garment. Therefore, the present absorbent article makes it possible to reduce problems when putting on and taking off the garment, and to prevent skin troubles.

[0015] [Aspect 2] The absorbent article of claim 1, wherein in at least one of the ventral portion and the rear portion, at least one of the non-bonded regions is located outside each of both ends of the absorbent body in the width direction.

[0016] In the present absorbent article, at least one non-bonded region is present on the outside of each of both ends in the width direction of the absorbent body in the ventral and / or dorsal portions. As a result, even if gathers are formed in the bonded regions or the outer sheets due to contraction of the elastic members, gathers are unlikely to be formed in the inner sheets located on both outer sides in the width direction of the absorbent body, and pressure marks from the gathers are unlikely to be left on the skin. As a result, the present absorbent article can further prevent skin troubles.

[0017] [Aspect 3] An absorbent article as described in aspect 1 or 2, wherein in at least one of the ventral portion and the dorsal portion, the non-bonded regions are arranged in pairs on the outside of each of both ends of the absorbent body in the width direction.

[0018] In the present absorbent article, the non-bonded regions are present in a balanced manner in the width direction in the ventral and / or dorsal portions so as to form pairs on the outside of both ends of the absorbent body in the width direction. As a result, even if gathers are formed in the bonded regions or the outer sheets due to contraction of the elastic members, gathers are unlikely to be formed in the inner sheets located on both outside sides in the width direction of the absorbent body, and pressure marks from the gathers are unlikely to be left on the skin in a balanced manner in the width direction. As a result, the present absorbent article can further suppress skin troubles.

[0019] [Aspect 4] Aspect 4. The absorbent article of any one of aspects 1 to 3, wherein the non-bonded region overlaps with at least one of the plurality of elastic members in the thickness direction.

[0020] In this absorbent article, the elastic member overlaps the non-bonded region in the thickness direction, i.e., the elastic member is present between the separate sheet in the non-bonded region and the outer sheet. At this time, the separate sheet in the non-bonded region is prone to wrinkles, but the inner sheet in the non-bonded region facing the separate sheet is less prone to wrinkles. Due to the difference in the ease of wrinkles, the wrinkles formed in the inner sheet in the non-bonded region are higher in the thickness direction (thicker). As a result, the distance between the elastic member and the skin is increased, making it less likely that pressure marks from the gathers will be left on the skin. As a result, this absorbent article can further suppress skin troubles.

[0021] [Aspect 5] The absorbent article of any one of aspects 1 to 4, wherein at least one of the ventral portion and the dorsal portion further includes, in the waist region, a waist bonded region formed by bonding the longitudinal outer end of the outer sheet, the end being folded over to cover the longitudinal outer end of the inner sheet, and the inner sheet, and a waist non-bonded region in which the folded-over point of the outer sheet and the longitudinal outer end of the inner sheet are not bonded.

[0022] In this absorbent article, the outer end of the outer sheet in the longitudinal direction is folded over to cover the outer end of the inner sheet in the longitudinal direction. The folded-over portion of the outer sheet (the portion of the folded-over point) is not joined to the inner sheet (waist non-joined region), but the outer end of the folded-over outer sheet in the longitudinal direction is joined to the inner sheet (waist joint region). In this way, by having a waist non-bonded region, the width of the wrinkles that can be created in the waist non-bonded region is larger (the number of wrinkles is reduced) compared to when the folded-back portion (the folded-back point) of the outer sheet is bonded to the inner sheet. By having wide wrinkles in the waist region, the wrinkles can be made to contact the skin on a surface level, improving the adhesion between the waist region and the skin and reducing friction between the skin and the inner sheet. As a result, the absorbent article can further prevent skin troubles.

[0023] [Aspect 6] An absorbent article as described in aspect 5, wherein the upper limit of the longitudinal length of the waist non-joined region is a length such that the inner position of the waist non-joined region in the longitudinal direction does not overlap with the non-joined region.

[0024] In this absorbent article, a waist non-bonded region (where the inner sheet and the outer sheet are not bonded) exists in the waist region, and a non-bonded region (where the inner sheet and the separate sheet are not bonded) exists longitudinally inward from the waist region. In this case, the upper limit of the longitudinal length of the waist non-bonded region is the length at which the longitudinal inner end of the waist non-bonded region does not overlap with the non-bonded region. This can prevent the overlap of the waist non-bonded region and the non-bonded region from causing excessive wrinkles that could damage the skin. This can improve skin troubles.

[0025] [Aspect 7] The absorbent article according to aspect 5 or 6, wherein the waist non-jointed region overlaps with an outer end portion of the absorbent body in the longitudinal direction in the thickness direction.

[0026] When the end of the highly rigid absorbent body comes into contact with the skin, the skin may be damaged. Therefore, in this absorbent article, the waist non-bonding region overlaps with the outer end of the absorbent body in the longitudinal direction in the thickness direction. In this way, by covering the outer end of the absorbent body in the longitudinal direction with the waist non-bonding region, it is possible to prevent the skin from being damaged by the outer end of the absorbent body in the longitudinal direction. This can improve skin troubles.

[0027] [Aspect 8] The absorbent article of any one of aspects 5 to 7, wherein the waist non-bonded region overlaps, in the thickness direction, with at least one of the plurality of elastic members bonded to the outer sheet.

[0028] In the absorbent article, the elastic member overlaps the waist non-jointed region in the thickness direction, i.e., the elastic member joined to the outer sheet is present between the inner sheet and the outer sheet in the waist non-jointed region. At this time, the outer sheet in the waist non-jointed region is prone to wrinkles, but the inner sheet in the waist non-jointed region facing the outer sheet is less prone to wrinkles. Due to the difference in the ease of wrinkles, the wrinkles formed in the inner sheet in the waist non-jointed region are higher in the thickness direction (thicker). As a result, the distance between the elastic member and the skin is increased, making it less likely that pressure marks from the gathers will be left on the skin. As a result, the absorbent article can further suppress skin troubles.

[0029] [Aspect 9] The absorbent article of any one of aspects 1 to 8 further comprises a pair of side seal portions formed by joining both ends in the width direction of the ventral portion and both ends in the width direction of the dorsal portion along the longitudinal direction, wherein the non-jointed region is adjacent to the side seal portions.

[0030] If the highly rigid side seal portion comes into contact with the skin, it may cause damage to the skin. Therefore, in this absorbent article, the non-bonded area is adjacent to the side seal attachment area. This prevents the side seal portion from coming into contact with the skin in the non-bonded area, reducing the chance of the side seal portion coming into contact with the skin. This prevents the side seal portion from damaging the skin, improving skin troubles.

[0031] [Aspect 10] The absorbent article of any one of claims 1 to 9, wherein the back portion further includes a pair of buttocks-covering portions provided on the inner side in the longitudinal direction and at both ends in the width direction, the buttocks-covering portions having the non-bonded region.

[0032] In this absorbent article, the non-bonded region is also provided in the buttocks cover portion, so gathers are less likely to form on the inner sheet on the skin contact surface side, and wrinkles are less likely to occur on the skin contact surface, so the skin around the buttocks and legs feels softer when sitting or moving the legs (walking, etc.), which reduces chafing of the skin around the buttocks and legs and improves skin troubles.

[0033] [Aspect 11] 11. The absorbent article of any one of claims 1 to 10, further comprising a moisturizer applied to the skin contact surface in at least one of the ventral portion and the dorsal portion.

[0034] In the present absorbent article, a moisturizing agent is applied to the skin contact surface of at least one of the ventral side portion and the dorsal side portion, so that the skin can be further prevented from drying out or being chafed, and thus the present absorbent article can further prevent skin troubles.

[0035] [Aspect 12] An absorbent article as described in any one of claims 1 to 11, wherein at least one of the ventral portion and the dorsal portion has an opening, and the non-bonded region is located in at least one of the longitudinal inner region and the lateral region and the widthwise inner region and the lateral region relative to the opening.

[0036] In this absorbent article, since the openings are provided in at least one of the ventral side portion and the rear side portion, sweat and moisture can be discharged through the openings, thereby reducing stuffiness inside the absorbent article, and thus the absorbent article can further suppress skin troubles caused by stuffiness.

[0037] [Aspect 13] 13. The absorbent article of any one of aspects 1 to 12, wherein the absorbent main body comprises a pair of leg gather portions located at both ends in the width direction and including leg area elastic members extending along the longitudinal direction, and each of the pair of leg gather portions comprises, in an extension line upper end region that is a region on the longitudinal extension line along which the leg area elastic members extend, a first sheet member that is closest to the skin side, a second sheet member adjacent to the first sheet member in the thickness direction, a moisturizer applied to the skin side of the first sheet member, and another non-bonded region where the first sheet member and the second sheet member are not bonded.

[0038] In the leg gathers of this absorbent article, a moisturizing agent is applied to the skin-facing side of the first sheet member in the region on the upper end of the extension line of the longitudinal extension of the leg elastic member, and another non-bonded region is formed where the first sheet member and the second sheet member are not bonded. Therefore, the first sheet member at the end of the extension line is less susceptible to wrinkles from the second sheet member (to which the leg elastic member is bonded), and wrinkles are less likely to occur on the skin-contacting surface, so that pressure marks from the gathers are less likely to appear on the wearer's skin. Furthermore, a moisturizing agent is applied to the first sheet member. As a result, this absorbent article can suppress skin troubles.

[0039] [Aspect 14] An absorbent article as described in any one of aspects 1 to 13, wherein in at least one of the ventral portion and the dorsal portion, the non-bonded regions are arranged in multiple numbers in leg loop regions located outside each of both ends of the absorbent body in the width direction and inside the longitudinal direction.

[0040] In the present absorbent article, a plurality of non-bonded regions functioning as buffer regions are arranged in the leg opening regions of the ventral and / or dorsal parts. Therefore, even if the leg opening regions of the ventral and / or dorsal parts are pressed against the user's legs when the absorbent article is worn, the non-bonded regions can suppress marks (rubber marks) of the elastic members that may be pressed against the user's skin by the elastic members of the ventral and / or dorsal parts.

[0041] [Aspect 15] An absorbent article as described in any one of aspects 1 to 14, wherein in at least one of the ventral portion and the dorsal portion, the non-bonded regions are arranged at least one each in a region on the outside of each of the widthwise end portions of the absorbent body and on the waist opening side, and in a region on the outside of each of the widthwise end portions of the absorbent body and on the leg opening side.

[0042] In the present absorbent article, at least one non-bonded region is disposed in each of the regions on the outside of both ends in the width direction of the absorbent body and on the waist opening side, and on the outside of both ends in the width direction of the absorbent body and on the leg opening side, in the ventral and / or dorsal portions. Therefore, when an infant wears the absorbent article, even if the ventral and / or dorsal portions are pressed against the infant in a sitting position, the non-bonded regions function as buffer regions, thereby preventing marks (rubber marks) that may be caused by the elastic members of the ventral and / or dorsal portions being pressed against the infant's skin.

[0043] Hereinafter, an absorbent article according to an embodiment of the present invention will be described with reference to the drawings, taking a disposable diaper for babies as an example. However, the present invention is not limited to the embodiment and example, and can be applied to other types of absorbent articles, such as disposable diapers for babies with different details, disposable diapers for adults, and shorts-type napkins, without departing from the subject matter of the present invention.

[0044] The present embodiment will be described. The disposable diaper 1 of the present embodiment is a pants-type. Figs. 1 to 3 are views showing the disposable diaper 1 according to the present embodiment. Fig. 1 is a plan view showing an example of the configuration of the disposable diaper 1 in an unfolded state, and therefore shows a state in which the side seal portion (described later) is not joined and the elastic member (described later) is stretched. Fig. 2 is a cross-sectional view taken along a longitudinal center line CL (described later) in Fig. 1. Fig. 3 is a cross-sectional view taken along a widthwise center line CW (described later) in Fig. 1. However, for ease of understanding, the non-joined region (described later), the joined region (described later), and the moisturizing agent (described later) in Fig. 1, and the elastic member (described later) on the side of the opening portion (described later) in Fig. 2 are omitted.

[0045] In the developed state shown in Figs. 1 to 3, the disposable diaper 1 has a longitudinal direction L, a width direction W, and a thickness direction T that are perpendicular to each other. A virtual line passing through the center of the width direction W of the disposable diaper 1 and extending along the longitudinal direction L is defined as a longitudinal center line CL, and a virtual line passing through the center of the longitudinal direction L and extending along the width direction W is defined as a width direction center line CW. Here, the direction and side approaching the longitudinal center line CL are defined as the inward and inner sides of the width direction W, respectively, and the direction and side moving away from the longitudinal center line CW are defined as the outward and outer sides of the width direction W, respectively. On the other hand, the direction and side approaching the width direction center line CW are defined as the inward and inner sides of the longitudinal direction L, respectively, and the direction and side moving away from the longitudinal center line CW are defined as the outward and outer sides of the longitudinal direction L, respectively. In addition, the disposable diaper 1 placed on a plane parallel to the plane including the longitudinal direction L and the width direction W is viewed from above the plane in the thickness direction T, which is referred to as a "planar view", and the shape grasped in a planar view is referred to as a "planar shape". Any direction in a plane including the longitudinal direction L and the width direction W is referred to as a "planar direction." When the disposable diaper 1 is worn, the side relatively closer to the wearer's skin surface in the thickness direction T of the disposable diaper 1 is also referred to as the "skin side" and the "non-skin side," respectively. In the disposable diaper 1, the surface that contacts the skin and the opposite surface are also referred to as the "skin contact surface" and the "non-skin contact surface," respectively. In the longitudinal direction L, the side relatively closer to the ventral side portion (described below) or the side farther from the dorsal side portion (described below) is also referred to as the ventral side or the front side, and the side relatively closer to the dorsal side portion or the side farther from the ventral side portion is also referred to as the dorsal side or the rear side. The above definitions are also used for each material of the disposable diaper 1 and for the disposable diaper 1 in a worn state.

[0046] In the disposable diaper 1, the members, structure, shape, etc. being aligned with a predetermined direction (for example, the longitudinal direction L, the width direction W, the thickness direction T) includes not only the case where the members, etc. are parallel to the predetermined direction, but also the case where they are within a range of ±30° to the predetermined direction. For curved or curved members, etc., the members, etc. are evaluated as described above for the tangents to each point on the curve, etc.

[0047] The disposable diaper 1 comprises a ventral portion 3, a dorsal portion 2, and an absorbent body 4. The ventral portion 3 is a portion of the disposable diaper 1 that covers the wearer's abdomen. The absorbent body 4 is a portion of the disposable diaper 1 that covers the wearer's crotch region and includes an absorbent body 8. The dorsal portion 2 is a portion of the disposable diaper 1 that covers the wearer's back. At least the front and rear ends in the longitudinal direction L of the absorbent body 4 extend to the center portions in the width direction W of the ventral portion 3 and the dorsal portion 2, respectively.

[0048] In this embodiment, the front and rear ends of the absorbent main body 4 are connected to the center portions in the width direction W of the abdominal part 3 and the back part 2, respectively, by, for example, an adhesive (e.g., hot melt adhesive, the same applies below). In this case, the front and rear ends of the absorbent main body 4 reach approximately the center portions in the longitudinal direction L of the abdominal part 3 and the back part 2, respectively, but may further reach approximately the outer ends in the longitudinal direction L.

[0049] The disposable diaper 1 is formed by joining together a pair of ventral joints 3a located at both ends in the width direction W of the ventral portion 3 and extending along the longitudinal direction L, and a pair of back joints 2a located at both ends in the width direction W of the back portion 2 along the longitudinal direction L. The pair of ventral joints 3a and the pair of back joints 2a joined together are also called a pair of side seals. In this case, in the disposable diaper 1, the ventral portion 3 and the back portion 2 joined together by the pair of side seals form a waist portion that covers the waist of the wearer. In addition, the outer ends of the ventral portion 3 and the back portion 2 in the longitudinal direction L define a waist opening through which the waist of the wearer passes. The region surrounding the waist opening in the waist portion, i.e., the region of the outer ends of the waist portion (the ventral portion 3 and the back portion 2) in the longitudinal direction L, is also called a waist region. In the disposable diaper 1, a pair of leg openings through which a pair of legs of a wearer pass are defined by the ends on both sides of the absorbent main body 4 in the width direction W and the inner ends of the abdominal section 3 and the back section 2 in the longitudinal direction L. In the disposable diaper 1, the regions located outside both ends of the absorbent main body 4 in the width direction W and inside half of the longitudinal direction L in the abdominal section 3 and the back section 2 are also referred to as leg opening regions. The leg opening regions can be said to be regions inside half of the longitudinal direction L among the regions not covered by the absorbent body 8 in the abdominal section 3 and the back section 2 when viewed from the skin side. The end of a member, etc., may vary depending on the case, but examples of the end of a member, etc., include a region occupying a range of 30% of the length of the member, etc. from the edge of the member, etc., preferably a region occupying a range of 20%, and more preferably a region occupying a range of 10%.

[0050] In this embodiment, in the unfolded state, the abdominal portion 3 and the back portion 2 each have a rectangular shape elongated in the width direction W, and are arranged apart from each other in the longitudinal direction L. The absorbent body 4 has a rectangular shape elongated in the longitudinal direction L, and one end of the absorbent body 4 in the longitudinal direction L is connected to the abdominal portion 3, and the other end is connected to the back portion 2. The abdominal portion 3, the absorbent body 4, and the back portion 2 are formed separately from each other. Therefore, the disposable diaper 1 is a three-piece type. At least two of the abdominal portion 3, the absorbent body 4, and the back portion 2 may be formed integrally, or may be connected integrally by another exterior sheet or the like. For example, when the abdominal portion 3 and the back portion 2 share at least one of the sheet members constituting the abdominal portion 3 and the back portion 2 and are formed integrally with a continuous sheet member, the disposable diaper 1 can be said to be a two-piece type constituted by the absorbent body 4 and the abdominal portion 3. A two-piece type disposable diaper is a disposable diaper which, when unfolded, has a ventral portion, a crotch portion, a back portion, and an absorbent body, and the ventral portion, the crotch portion, and the back portion are joined together by a single sheet member, such as an outer body.

[0051] Each of the ventral part 3 and the back part 2 is formed from a liquid-impermeable sheet member. In this embodiment, each of the ventral part 3 and the back part 2 is formed from a sheet member made of hydrophobic fibers, at least in the member constituting the skin side surface (inner sheet member 31, 21: described later). Therefore, at least the surface portion of the skin side surface of the sheet member contains hydrophobic fibers. As a result, it is difficult for a hydrophilic agent to penetrate into the surface portion of the skin side surface. However, each of the ventral part 3 and the back part 2 may be formed from a sheet member made of hydrophobic fibers, even in the non-skin side surface (outer sheet member 32, 22: described later). The surface portion refers to the range of thickness from the surface of the sheet member to 1 / 4.

[0052] When the sheet member is made of hydrophobic fibers, the fibers constituting the sheet member preferably contain hydrophobic fibers at 70% by mass or more, more preferably at 80% by mass or more, even more preferably at 90% by mass or more, and may be 100% by mass. Examples of hydrophobic fibers include thermoplastic resin fibers, and examples of thermoplastic fibers include polyolefin resin fibers such as polypropylene and polyethylene, polyamide resin fibers such as 6-nylon and 6,6-nylon, and polyester resin fibers such as polyethylene terephthalate and polybutylene terephthalate. It is preferable that these thermoplastic fibers do not contain a hydrophilic agent. A sheet member containing 70% by mass or more of hydrophobic fibers can be called a hydrophobic sheet member (hydrophobic sheet).

[0053] The ventral side portion 3 is formed by stacking at least an inner sheet member 31 located on the skin side and an outer sheet member 32 located on the non-skin side in the thickness direction T and joining them with an adhesive, heat sealing, or the like (adhesive, etc., the same applies below). Similarly, the dorsal side portion 2 is formed by stacking at least an inner sheet member 21 located on the skin side and an outer sheet member 22 located on the non-skin side in the thickness direction T and joining them with an adhesive, or the like.

[0054] In this embodiment, the outer end in the longitudinal direction L of the non-skin-side outer sheet member 32 is folded back to the skin side to become the folded back end 32a, which overlaps with the skin-side inner sheet member 31. The folded back end 32a of the outer sheet member 32 that is folded back to the skin side may be considered to be the inner sheet member 31. Similarly, the outer end in the longitudinal direction L of the non-skin-side outer sheet member 22 is folded back to the skin side to become the folded back end 22a, which overlaps with the skin-side inner sheet member 21. The folded back end 22a of the outer sheet member 22 that is folded back to the skin side may be considered to be the inner sheet member 21.

[0055] In this embodiment, the inner sheet members 31, 21 and the outer sheet members 32, 22 of the ventral side portion 3 and the dorsal side portion 2 are bonded at multiple locations with a hydrophobic adhesive. Therefore, in each of the ventral side portion 3 and the dorsal side portion 2, the inner sheet members 31, 21 and the outer sheet members 32, 22 are scattered with adhesive at multiple locations.

[0056] In the abdominal portion 3, a plurality of waist elastic members 13 for waist gathering are arranged between the inner sheet member 31 located on the skin side and the outer sheet member 32 located on the non-skin side. The plurality of waist elastic members 13 extend from one end to the other end in the width direction W of the abdominal portion 3, except for at least an area overlapping with the center of the absorbent body 8 in the thickness direction T, along the width direction W, and are arranged at intervals in the longitudinal direction L. The inner sheet member 31 and the outer sheet member 32 are joined to the plurality of waist elastic members 13 by adhesive or the like. In this embodiment, a hydrophobic adhesive is used. Note that, when the abdominal portion 3 has an opening portion described later, the waist elastic member 13 may not be arranged in the opening portion or in the area in the abdominal portion 3 where one or more opening portions are arranged.

[0057] In the back side portion 2, a plurality of waist circumference elastic members 12 for waist gathering are arranged between the inner sheet member 21 located on the skin side and the outer sheet member 22 located on the non-skin side. The plurality of waist circumference elastic members 12 extend from one end of the width direction W of the back side portion 2 to the other end of the width direction W, except for at least an area overlapping with the center of the absorbent body 8 in the thickness direction T, along the width direction W, and are arranged at intervals in the longitudinal direction L. The inner sheet member 21 and the outer sheet member 22 are joined to the plurality of waist circumference elastic members 12 with an adhesive or the like. In this embodiment, a hydrophobic adhesive is used. Note that, when the back side portion 2 has an opening portion described later, the waist circumference elastic member 12 may not be arranged in the opening portion or in the area where one or more opening portions are arranged in the back side portion 2.

[0058] In this embodiment, the ventral part 3 may include a ventral cover sheet member 43 arranged on the skin side surface so as to cover the ventral end of the absorbent main body 4 in the longitudinal direction L from the skin side. The ventral cover sheet member 43 prevents the ventral end of the absorbent main body 4 from directly contacting the skin of the wearer, thereby suppressing chafing of the skin. Similarly, the back part 2 may include a back cover sheet member 42 arranged on the skin side surface so as to cover the back end of the absorbent main body 4 in the longitudinal direction L from the skin side. The back cover sheet member 42 prevents the back end of the absorbent main body 4 from directly contacting the skin of the wearer, thereby suppressing chafing of the skin. Examples of materials for the ventral cover sheet member 43 and the back cover sheet member 42 include materials similar to those for the inner sheets 31 and 21.

[0059] The multiple waist elastic members 12, 13 stretch the waist portion. The type of each elastic member is not particularly limited, but examples include thread-like or sheet-like rubber. The material of each elastic member is not particularly limited, but examples include styrene butadiene rubber and urethane rubber. The properties of each elastic member, such as the cross-sectional size (wire diameter, etc.) and the elongation ratio, are appropriately selected according to the magnitude of the tightening force corresponding to the position in the waist portion.

[0060] Examples of the above-mentioned sheet members include any liquid-impermeable sheet such as a liquid-impermeable nonwoven fabric or synthetic resin film, a composite sheet of these, an SB nonwoven fabric, or an SMS nonwoven fabric. The type of nonwoven fabric is not particularly limited, and examples thereof include a meltblown nonwoven fabric, a spunbond nonwoven fabric, an airlaid nonwoven fabric, and an air-through nonwoven fabric. The material of the nonwoven fabric or synthetic resin film of the sheet member is not particularly limited as long as it can be used for sanitary products, and examples thereof include polyolefin resins such as polypropylene and polyethylene, polyamide resins such as 6-nylon and 6,6-nylon, and polyester resins such as polyethylene terephthalate and polybutylene terephthalate. The basis weight of the nonwoven fabric of the sheet member is, for example, 5 to 100 g / m 2 and preferably 10 to 50 g / m 2The length (thickness) of the sheet member in the thickness direction T is, for example, 0.1 to 5 mm, and preferably 0.1 to 2 mm. The sheet members constituting each of the ventral side portion 3 and the dorsal side portion 2 may be two sheets of the inner sheet member and the outer sheet member described above, or one sheet, or three or more sheets (not shown). The sheet members do not need to be folded (not shown). When each sheet member is a hydrophobic sheet, for example, when the sheet member contains hydrophobic fibers as the main constituent fibers, a hydrophobic material can be selected from the above materials as the material of the fibers constituting the sheet members.

[0061] In this embodiment, the disposable diaper 1 further includes an exterior sheet member 14 that bridges between the abdominal portion 3 and the back portion 2. The exterior sheet member 14 is a liquid-impermeable sheet member, for example, a nonwoven fabric, and both ends of the exterior sheet member 14 in the longitudinal direction L are laminated on the abdominal portion 3 and the back portion 2, respectively, and joined with an adhesive or the like. The type and material of the nonwoven fabric are as described above. The exterior sheet member 14 is also joined with an adhesive or the like to the non-skin side of the absorbent main body 4 that is disposed generally between the abdominal portion 3 and the back portion 2, and supports and protects the absorbent main body 4 from the non-skin side. The exterior sheet member 14 may be composed of two or more sheet members (not shown). A sheet member other than the exterior sheet member 14 may be provided on the non-skin side (not shown). The exterior sheet member 14 may be configured as a part of the absorbent main body 4.

[0062] The absorbent main body 4 has a main body central portion 10 located at the center in the width direction W and extending along the longitudinal direction L, and may further have a pair of leg gather portions 5 located at both ends in the width direction W and extending along the longitudinal direction L. Each of the pair of leg gather portions 5 extends along the longitudinal direction L and has a plurality of leg elastic members 5a arranged at intervals in the width direction W. Each of the pair of leg gather portions 5 includes an extension line end region 5F on both sides in the longitudinal direction L, which is a region on an extension line of the longitudinal direction L where the plurality of leg elastic members 5a extend. The extension line end region 5F is a region where the plurality of leg elastic members 5a are not arranged, but an elastic member that does not substantially function as an elastic member and has no elastic force may be arranged therein.

[0063] The main body central portion 10 has a substantially rectangular shape and includes a liquid-permeable top sheet 7, a liquid-impermeable back sheet 9, and an absorbent 8 located between the top sheet 7 and the back sheet 9, which absorbs and retains liquid (e.g., urine, menstrual blood). The absorbent 8, the top sheet 7, and the back sheet 9 are each joined with an adhesive, and the top sheet 7 and the back sheet 9 are joined with an adhesive at their peripheral portions. The shape of the main body central portion 10 is not limited to the above example as long as it is long in the longitudinal direction L, and examples of the shape include a rectangle with rounded corners, a rectangle with short sides that curve outwardly, and an hourglass shape.

[0064] Examples of the surface sheet 7 include liquid-permeable nonwoven fabrics or woven fabrics, synthetic resin films with liquid-permeable holes, composite sheets of these, and the like. Examples of the back sheet 9 include liquid-impermeable nonwoven fabrics or synthetic resin films, composite sheets of these, and SMS nonwoven fabrics. There is no particular limit to the type of nonwoven fabric, and examples of the type include meltblown nonwoven fabrics, spunbond nonwoven fabrics, airlaid nonwoven fabrics, and air-through nonwoven fabrics. There is no particular limit to the type of synthetic resin film, and known film materials can be used. There is no particular limit to the material of the nonwoven fabric or synthetic resin film as long as it can be used for sanitary products, and examples of the material include olefin-based resins such as polyethylene and polypropylene, polyamide-based resins such as 6-nylon and 6,6-nylon, and polyester-based resins such as polyethylene terephthalate and polybutylene terephthalate. Cellulosic fibers may be used as the material of the nonwoven fabric. In order to impart breathability, the synthetic resin film may contain inorganic particles such as calcium carbonate.

[0065] The absorbent 8 includes an absorbent core 8b that absorbs and retains liquid, and a core wrap 8a that contains the absorbent core 8b, and may include a groove portion 8c that can diffuse liquid in the longitudinal direction L and the width direction W. The material of the absorbent core 8b is an absorbent material, for example, at least one of a cellulose-based fiber and a superabsorbent polymer. The cellulose-based fiber includes, for example, natural cellulose fibers such as pulp fibers such as wood pulp fibers, crosslinked pulp fibers, and non-wood pulp fibers, regenerated cellulose fibers, and semi-synthetic cellulose fibers. In the case of pulp fibers, the size of the fibers includes an average major axis of several tens of μm, preferably 20 to 40 μm, and an average fiber length of several mm, preferably 2 to 5 mm. The superabsorbent polymer (SAP) includes, for example, polyacrylate-based, polysulfonate-based, and maleic anhydride-based superabsorbent polymers. The size of the superabsorbent polymer (when dry) includes an average particle diameter of, for example, several hundred μm, preferably 200 to 500 μm. The basis weight of the cellulosic fiber and the highly absorbent polymer is, for example, 100 to 400 g / m 2 Examples of materials for the core wrap 8a include liquid-permeable sheets such as nonwoven fabrics and tissues.

[0066] The main body central portion 10 has a pair of leak-proof walls 6 arranged on both sides in the width direction W so as to face each other and extending along the longitudinal direction L. Each leak-proof wall 6 is formed of a leak-proof sheet member 6b extending along the longitudinal direction L and containing a plurality of leak-proof elastic members 6a arranged at intervals in the width direction W. The outer end of each leak-proof wall 6 in the width direction W is bonded to at least one of the top sheet 7, the absorbent body 8, and the back sheet 9 with an adhesive or the like to form a fixed end, and the inner end in the width direction W is separated from the other sheets including the top sheet 7 to form a free end. The plurality of leak-proof elastic members 6a are bonded to the vicinity of the free end of the leak-proof sheet member 6b with an adhesive. The leak-proof sheet member 6b may be, for example, a hydrophobic sheet member, and the hydrophobic sheet member may be a nonwoven fabric containing hydrophobic fibers. The type and material of the nonwoven fabric may be, for example, the same as those of the inner sheet members 31 and 21 described above. The plurality of leak-proof elastic members 6a are exemplified by rubber threads, and the types and materials of the elastic members are as described above. The properties of the elastic members, such as the cross-sectional size (wire diameter, etc.) and the elongation ratio, are appropriately selected according to the function of the leak-proof walls 6. Note that each of the leak-proof walls 6 may have its inner end in the width direction W folded back toward the outside in the width direction W.

[0067] A pair of leg gathers 5 are joined to both ends of the width direction W of the main body central part 10. Each leg gather 5 extends along the longitudinal direction L and includes a plurality of leg elastic members 5a arranged at intervals in the width direction W, and skin-side and non-skin-side leg sheet members 5b that sandwich the plurality of leg elastic members 5a. The inner end of each leg gather 5 in the width direction W is joined to the non-skin-side surface at the end in the width direction W of the main body central part 10 with an adhesive or the like to form a fixed end, and the outer end in the width direction W is separated from the main body central part 10 to form a free end. The plurality of leg elastic members 5a are joined to the skin-side and non-skin-side leg sheet members 5b with an adhesive near the free ends. The plurality of leg elastic members 5a stretch each leg gather 5. The leg sheet members 5b may be, for example, hydrophobic sheet members, and examples of the hydrophobic sheet members include nonwoven fabrics containing hydrophobic fibers. The type and material of the nonwoven fabric are as described above. The leg elastic members 5a are exemplified by rubber threads, and the type and material of the elastic members are as described above. The properties of the elastic members, such as the cross-sectional size (linear, etc.) and the elongation ratio of the elastic members, are appropriately selected according to the magnitude of the tightening force corresponding to the position in the leg gathers 5.

[0068] In the disposable diaper 1, the pair of leg gathers 5 are bridged by an exterior sheet member 14. Both end portions in the width direction W of the exterior sheet member 14 are laminated on the inner end portions in the width direction W of each of the pair of leg gathers 5 and joined with an adhesive or the like, thereby supporting and protecting the pair of leg gathers 5 from the non-skin side.

[0069] The back side portion 2 may include a back side extension portion extending further inward from the inner edge in the longitudinal direction L in the back side main body portion that occupies substantially the same range as the back side joint portion 2a in the longitudinal direction L. The back side extension portion is an inner region in the longitudinal direction L of the back side portion 2. The portions of the back side extension portion that do not overlap with the absorbent main body 4, i.e., the portions on both sides in the width direction W, function as a pair of buttocks covering portions 40. The buttocks covering portion 40 protects the buttocks of the wearer from the outside. The buttocks covering portion 40 includes a buttocks elastic member 41 that deforms the buttocks covering portion 40 to fit the buttocks of the wearer. The buttocks covering portion 40 may have a corner on the inside in the longitudinal direction L and on the outside in the width direction W cut with a curve that is concave inward.

[0070] Next, the non-bonded regions and bonded regions in this embodiment will be described. Fig. 4 is a plan view showing the non-bonded regions and bonded regions in Fig. 1 in an unfolded state. Fig. 5 is a cross-sectional view taken along the longitudinal center line CL in Fig. 4. In Figs. 4 and 5, for ease of understanding, some configurations that are not related to the description of the non-bonded regions and bonded regions are omitted, and the whole is illustrated in a schematic manner. For example, the non-bonded regions (51, 52) are illustrated in a rounded rectangle with dotted lines as the outline, and the bonded region (53) is illustrated in a wavy dotted line.

[0071] At least one of the abdominal portion 3 and the back portion 2 includes a separate sheet located between the outer sheet and the inner sheet, and a plurality of elastic members located between the outer sheet and the separate sheet, joined to the outer sheet and the separate sheet, and extending along the width direction. At least one of the abdominal portion 3 and the back portion 2 further includes a non-jointed region located inside the waist region in the longitudinal direction, where the inner sheet and the separate sheet are not joined, and a joined region adjacent to the non-jointed region, where the inner sheet and the separate sheet are joined.

[0072] In this embodiment, as shown in Fig. 4 and Fig. 5(a), the back side portion 2 includes a separate sheet member 50 located between the outer sheet member 22 and the inner sheet member 21, and a plurality of waist circumference elastic members 12 located between the outer sheet member 22 and the separate sheet member 50, joined to the outer sheet member 22 and the separate sheet member 50, and extending along the width direction W. At least a part of the outer sheet member 22 and the inner sheet member 21 is joined to at least a part of the separate sheet member 50 with an adhesive 60. The back side portion 2 includes a non-joined region 52 located inside the waist region in the longitudinal direction L, where the inner sheet member 21 and the separate sheet member 50 are not joined, and a joined region 53 adjacent to the non-joined region 52, where the inner sheet member 21 and the separate sheet member 50 are joined.

[0073] Similarly, in this embodiment, as shown in Fig. 4 and Fig. 5(b), the abdominal side portion 3 includes a separate sheet member 50 located between the outer sheet member 32 and the inner sheet member 31, and a plurality of waist circumference elastic members 13 located between the outer sheet member 32 and the separate sheet member 50, joined to the outer sheet member 32 and the separate sheet member 50, and extending along the width direction W. At least a part of the outer sheet member 32 and the inner sheet member 31 is joined to at least a part of the separate sheet member 50 with an adhesive 60. The abdominal side portion 3 includes a non-joined region 52 located inside the waist region in the longitudinal direction L, where the inner sheet member 31 and the separate sheet member 50 are not joined, and a joined region 53 adjacent to the non-joined region 52, where the inner sheet member 31 and the separate sheet member 50 are joined.

[0074] In addition, in FIG. 5(a) and FIG. 5(b), the non-bonded region 52 is shown typically by a rounded rectangle with dotted lines as its outline, but it does not necessarily have to be a region in which such a space is formed. The non-bonded region 52 may be a region in which the sheet members stacked in the thickness direction T are not bonded to each other (non-bonded). The bonded region 53 is shown typically by the presence of the adhesive 60 in a wavy dotted line, but the adhesive 60 does not have the same thickness as the non-bonded region as shown. The bonded region 53 may be a region in which the sheet members stacked in the thickness direction T are bonded to each other by the adhesive 60, and the adhesive 60 is usually thinner than the sheet members, so that the sheet members are substantially in contact with each other via the thin adhesive 60. However, the bonded region 53 does not have to be bonded by an adhesive as long as they are bonded.

[0075] The separate sheet member 50 may be made of the same type of nonwoven fabric as the outer sheet members 32, 22 and the inner sheet members 31, 21. There are no particular limitations on its shape and size as long as it can be disposed between the outer sheet members 32, 22 and the inner sheet members 31, 21 and the above-mentioned configuration can be formed between the outer sheet members 32, 22 and the inner sheet members 31, 21. Examples of its shape and size include a rectangular shape with a length in the longitudinal direction L that is about 2 / 3 of the length of the ventral side portion 3 or the dorsal side portion 2, and a length in the width direction W that is about the same as that of the ventral side portion 3 or the dorsal side portion 2.

[0076] Such a non-bonded region 52 (schematically shown by a rounded rectangle with dotted lines as the outline in FIG. 5) is a region where the inner sheet members 31, 21 and the separate sheet member 50 that constitute the skin contact surface are not bonded to each other. Therefore, the non-bonded region 52 is a region where a hollow space can be or is generated between the inner sheet members 31, 21 and the separate sheet member 50. However, the hollow space does not have to be closed to the outside. And, no elastic member such as the waist circumference elastic member 13 is present in the non-bonded region 52. In such a non-bonded region 52, even if the separate sheet member 50 contracts due to the elastic member, the contraction of the elastic member is unlikely to be transmitted to the inner sheet members 31, 21, and a hollow space is likely to be generated, so that gathers and wrinkles are unlikely to be generated in the inner sheet members 31, 21. Therefore, even if the inner sheet member 31 in the non-bonded region 52 comes into contact with the wearer's skin, the skin is unlikely to be damaged.

[0077] On the other hand, the bonding region 53 (schematically shown in FIG. 5 by the presence of wavy dotted adhesive 60) is a region where the inner sheet members 31, 21 and the separate sheet member 50 constituting the skin contact surface are bonded to each other. Therefore, in the bonding region 53, no hollow space is generated between the inner sheet members 31, 21 and the separate sheet member 50. In such a bonding region 53, when the separate sheet member 50 contracts due to the elastic member, the contraction of the elastic member is propagated to the inner sheet members 31, 21, causing the inner sheet members 31, 21 to function as gathers, allowing the ventral portion 3 and the dorsal portion 2 to fit appropriately to the skin.

[0078] Here, when at least a part of the outer sheet members 32, 22 and the inner sheet members 31, 21 are bonded to at least a part of the separate sheet member 50 by the adhesive 60, the adhesive 60 may be applied in a predetermined pattern. Examples of such patterns include an omega pattern, a spiral pattern, and a stripe pattern. In an area where the adhesive 60 is applied in such a pattern, even in an area where the sheet members are bonded to each other, there are areas where the sheet members are not bonded to each other when viewed in a narrow range (for example, within one Ω, within one spiral, between each line of the stripe). In an area where the adhesive 60 is applied in such a pattern, the "narrow range area" where the sheet members are not bonded to each other is not included in the non-bonded area 52 in this embodiment. That is, in this embodiment, the non-bonded area 52 refers to an area where the adhesive 60 is not applied, excluding the "narrow range area" in the area where the adhesive 60 is applied in such a pattern.

[0079] The number, shape, size, position and arrangement of the non-bonded regions 52 are not particularly limited, and are appropriately selected according to the performance required for suppressing skin troubles. The number of non-bonded regions 52 may vary depending on the size of the non-bonded regions 52, but may be, for example, 1 to 20, and preferably 4 to 10. The shape of the non-bonded regions 52 is not particularly limited, but may be, for example, a circle, an ellipse, a rectangle, a polygon, a diamond, etc. The size of the non-bonded regions 52 may have a lower limit of, for example, 1 cm. 2 5cm 2 is preferred, 10cm 2 It is more preferable that the size is not too small, so that damage to the skin is less likely to occur. There is no particular upper limit as long as it is smaller than the size of the ventral part 3 and the dorsal part 2. For example, it is preferable that the size is 300 cm. 2 250cm 2 is preferred, and 200 cm 2is more preferable. By not being too large, the disposable diaper 1 can be kept comfortable to wear. Examples of the positions of the non-bonded regions 52 include positions that do not overlap with the absorbent main body 4 and positions that are symmetrical with respect to the longitudinal center line CL. The arrangement of the non-bonded regions 52 depends on the number and size of the non-bonded regions 52, but examples of the arrangement include a row shape along the longitudinal direction L or the width direction W, a matrix shape, a staggered shape, a checkerboard shape, and tilted arrangements thereof along the longitudinal direction L and the width direction W.

[0080] In this embodiment, the number of non-bonded regions 52 in the ventral portion 3 and the dorsal portion 2 is 6 and 4, respectively, the shape of the non-bonded regions 52 is rectangular, and the size of the non-bonded regions 52 is 15 to 25 cm 2 Regarding the positions of the non-bonded regions 52, in the abdominal portion 3, two are provided on each side of the width direction W of the absorbent main body 4 (absorbent body 8), and are arranged at intervals in the longitudinal direction L in positions that are line-symmetrical with respect to the longitudinal center line CL (two on the right side and two on the left side). In the dorsal portion 2, one is provided on each side of the width direction W of the non-stretchable region OHA, and two are provided on each side of the width direction W of the absorbent main body 4 (absorbent body 8), and are arranged at intervals in the longitudinal direction L in positions that are line-symmetrical with respect to the longitudinal center line CL (three on the right side and three on the left side). The non-bonded regions 52 are arranged in a matrix along the longitudinal direction L and the width direction W.

[0081] On the other hand, the bonded region 53 is basically a region adjacent to the non-bonded region 52 in the ventral part 3 and the back part 2. In this embodiment, the bonded region 53 is generally arranged on both outer sides of the non-bonded region 52 in the ventral part 3 and the back part 2 in the longitudinal direction L so as to sandwich the non-bonded region.

[0082] Thus, the present disposable diaper 1 (absorbent article) has a separate sheet member 50 (separate sheet) between the outer sheet members 32, 22 (outer sheets) and the inner sheet members 31, 21 (inner sheets) in the abdominal side portion 3 and / or the back side portion 2. Furthermore, the present disposable diaper 1 has waist circumference elastic members 13, 12 joined to both the outer sheet members 32, 22 and the separate sheet member 50, between the two sheet members. Furthermore, the present disposable diaper 1 has a non-joined region 52 and a joined region 53 between the inner sheet members 31, 21 and the separate sheet member 50, which are located inside the waist region in the longitudinal direction L. Therefore, on the side of the inner sheet members 31, 21 (skin-facing side), the separate sheet member 50 is joined to the inner sheet members 31, 21 at the joined region 53, so that the contraction of the waist circumference elastic members 13, 12 causes the separate sheet member 50 to contract, and the inner sheet members 31, 21 contract accordingly, forming gathers. On the other hand, since the separate sheet member 50 and the inner sheet members 31, 21 are not joined in the non-jointed region 52, even if the separate sheet member 50 contracts due to the contraction of the waist elastic members 13, 12, the contraction is unlikely to be transmitted to the inner sheet members 31, 21 constituting the skin contact surface. Therefore, gathers are unlikely to be formed in the inner sheet members 31, 21, and wrinkles are unlikely to occur on the skin contact surface. In this way, gathers are unlikely to be formed in the inner sheet members 31, 21 on the skin contact surface side of the non-jointed region 52 inside the longitudinal direction L from the waist region, and wrinkles are unlikely to occur on the skin contact surface, so that pressure marks of the gathers are unlikely to be left on the wearer's skin corresponding to the non-jointed region 52. As a result, the disposable diaper 1 can suppress skin troubles. Furthermore, on the side of the outer sheet members 32, 22 (non-skin facing side), the outer sheet members 32, 22 and the separate sheet member 50 are joined together with the waist circumference elastic members 13, 12, so that the outer sheet members 32, 22 are unlikely to tear when put on and the friction with clothing is unlikely to increase, making it unlikely to cause problems when putting on or taking off the diaper. Therefore, with this disposable diaper 1, it is possible to make it unlikely to cause problems when putting on or taking off the diaper and to prevent skin troubles.

[0083] In a preferred embodiment of the present invention, at least one non-bonded region 52 is disposed on the outside of each of both ends of the absorbent 8 in the width direction W in at least one of the abdominal portion 3 and the back portion 2. In this embodiment, at least two non-bonded regions 52 are disposed on the outside of each of both ends of the absorbent 8 in the width direction W (in the main body central portion 10 of the absorbent main body 4) in at least the abdominal portion 3 and the back portion 2. In this manner, by disposing the non-bonded regions 52 on both outsides of the absorbent 8 in the width direction W in the abdominal portion 3 and / or the back portion 2, even if gathers are formed in the outer sheet members 32, 22 in the bonded region 53 or the non-bonded region 52 due to contraction of the waist circumference elastic members 13, 12, gathers are unlikely to be formed in the inner sheet members 31, 21 in the non-bonded region 52. Therefore, the present disposable diaper 1 is unlikely to leave pressure marks of gathers on the skin, and therefore skin troubles can be further suppressed.

[0084] In a preferred embodiment of the present invention, in at least one of the ventral portion 3 and the dorsal portion 2, the non-bonded regions 52 are arranged in pairs on the outside of both ends of the absorbent body 8 in the width direction W. However, the non-bonded regions 52 are arranged in pairs on the left and right sides of the longitudinal center line CL, and for example, one non-bonded region 52 is present on the right side corresponding to one non-bonded region 52 on the left side. In this case, the left and right non-bonded regions 52 do not necessarily have to be the same size, and do not necessarily have to be arranged line-symmetrically. In this embodiment, at least in the ventral portion 3 and the dorsal portion 2, the non-bonded regions 52 are arranged in pairs line-symmetrically across the longitudinal center line CL, and arranged in the width direction W with a gap in between in the longitudinal direction L, on the outside of both ends of the absorbent body 8 in the width direction W (in the main body central portion 10 of the absorbent main body 4). In this way, by arranging the non-bonded regions 52 in a balanced manner on both outer sides in the width direction W of the absorbent body 8 in the ventral portion 3 and / or the dorsal portion 2 in pairs, even if gathers are formed in the outer sheet members 32, 22 in the bonded regions 53 or non-bonded regions 52 due to contraction of the waist circumference elastic members 13, 12, gathers are unlikely to be formed in the inner sheet members 31, 21 in the non-bonded regions 52. Therefore, with the present disposable diaper 1, pressure marks from the gathers are unlikely to be left on the skin in a balanced manner, further reducing skin troubles.

[0085] In a preferred embodiment of the present invention, the non-bonded region 52 overlaps at least one of the multiple waist elastic members 13, 12 in the thickness direction T. That is, at least a part of the multiple waist elastic members 13, 12 is disposed between the separate sheet member 50 in the non-bonded region 52 and the outer sheet members 32, 22 overlapping the separate sheet member 50 in the thickness direction T. At this time, the separate sheet member 50 in the non-bonded region 52 is prone to wrinkles, but the inner sheet members 31, 21 in the non-bonded region 52 facing the separate sheet member 50 are unlikely to wrinkle. Due to the difference in the ease of wrinkles, the wrinkles formed in the inner sheet members 31, 21 in the non-bonded region 52 are higher in the thickness direction T (thicker). As a result, the distance between the waist elastic members 13, 12 and the skin is increased, and the skin is less likely to be compressed by the gathers. As a result, the absorbent article can further suppress skin troubles.

[0086] In a preferred embodiment of the present invention, at least one of the abdominal portion 3 and the back portion 2 further includes a waist joint region 53a and a waist non-joined region 51 in the waist region. The waist joint region 53a is formed by joining folded ends 32a, 22a, which are outer ends in the longitudinal direction L of the outer sheet members 32, 22 (outer sheets) folded back so as to cover the outer ends in the longitudinal direction L of the inner sheet members 31, 21 (inner sheets), to the inner sheet members 31, 21. The waist non-joined region 51 is formed without joining (non-joining) the folded-back portions of the outer sheet members 32, 22 to the outer ends in the longitudinal direction L of the inner sheet members 31, 21. In this embodiment, the waist non-jointed area 51 is formed between a pair of ventral joints 3a in the waist region (outer end in the longitudinal direction L) of the ventral part 3, and is formed between a pair of dorsal joints 2a in the waist region (outer end in the longitudinal direction L) of the dorsal part 2.

[0087] Thus, by having the waist non-bonded region 51, the width of the wrinkles that can be generated in the waist non-bonded region 51 becomes larger (the number of wrinkles becomes smaller) compared to when the folded-back portions (fold-back points) of the outer sheet members 32, 22 are bonded to the inner sheet members 31, 21. By having wide wrinkles in the waist region, the wrinkles can be made to come into surface contact with the skin, improving the adhesion between the waist region and the skin and reducing friction between the skin and the inner sheet members 31, 21. As a result, the disposable diaper 1 can further suppress skin troubles.

[0088] In a preferred embodiment of the present invention, the upper limit of the length in the longitudinal direction L of the waist non-bonded region 51 is a length at which the inner position of the waist non-bonded region 51 in the longitudinal direction L does not overlap with the non-bonded region 52. The waist region has the waist non-bonded region 51 (the inner sheet members 31, 21 and the outer sheet members 32, 22 are not bonded to each other), and the non-bonded region 52 (the inner sheet members 31, 21 and the separate sheet member 50 are not bonded to each other) on the inner side of the waist region in the longitudinal direction. As described above, in the present disposable diaper 1, the position of the inner end of the waist non-bonded region 51 in the longitudinal direction L does not overlap with the outer end of the non-bonded region 52 in the longitudinal direction L. This can prevent the waist non-bonded region 51 and the non-bonded region 52 from overlapping to cause excessive wrinkles that may damage the skin. This can improve skin troubles.

[0089] In another embodiment, the waist non-bonded region 51 may overlap the outer end of the absorbent main body 4 in the longitudinal direction L in the thickness direction T. For example, a method is considered in which the length of the folded end 32a, 22a, which is the outer end of the outer sheet member 32, 22 in the longitudinal direction L and is folded back to cover the outer end of the inner sheet member 31, 21 in the longitudinal direction L, is lengthened inwardly in the longitudinal direction L so as to overlap the outer end of the absorbent main body 4 in the longitudinal direction L. In this case, a ventral cover sheet 43 and a dorsal cover sheet 42 may be arranged on the ventral portion 3 and the dorsal portion 2, respectively, so as to overlap the outer end of the absorbent main body 4 in the longitudinal direction L.

[0090] If the end of the highly rigid absorbent main body 4 comes into contact with the skin, it may cause damage to the skin. Therefore, in the disposable diaper 1 of another embodiment, the waist non-bonded region 51 may be formed to overlap the outer end of the absorbent main body 4 in the longitudinal direction L in the thickness direction T. In this way, by covering the waist non-bonded region 51 and the outer end of the absorbent main body 4 in the longitudinal direction L, it is possible to prevent damage to the skin caused by the outer end of the absorbent main body 4 in the longitudinal direction L. This can improve skin troubles.

[0091] In a preferred embodiment of the present invention, the waist non-bonded region 51 overlaps at least one of the multiple waist elastic members 13, 12 (elastic members) bonded to the outer sheet members 32, 22 (outer sheets) in the thickness direction T. That is, a part of the multiple waist elastic members 13, 12 is present between the inner sheet members 31, 21 constituting the waist non-bonded region 51 and the outer sheet members 32, 22 (other than the folded-back ends 32a, 22a) not constituting the waist non-bonded region 51. In this case, the outer sheet members 32, 22 (other than the folded-back ends 32a, 22a) in the waist non-bonded region 51 are prone to wrinkles, but the inner sheet members 31, 21 in the waist non-bonded region 51 facing the outer sheet members 32, 22 are less prone to wrinkles. Due to the difference in the ease of wrinkles, the wrinkles formed in the inner sheet members 31, 21 in the waist non-bonded region 51 are higher in the thickness direction T (thicker). This increases the distance between the waist elastic members 13, 12 and the skin, making it difficult for the gathers to leave pressure marks on the skin. This allows the disposable diaper 1 to further reduce skin troubles.

[0092] In a preferred embodiment of the present invention, a non-bonded region 52 is disposed adjacent to a pair of side seal portions (wherein the ventral bonded portion 3a and the dorsal bonded portion 2a are bonded) formed by bonding both ends of the ventral portion 3 in the width direction W and both ends of the dorsal portion 2 along the longitudinal direction L. This prevents the side seal portions from coming into contact with the skin by the non-bonded region 52, thereby reducing the chances of the side seal portions coming into contact with the skin. This prevents the side seal portions, which are highly rigid and prone to damaging the skin, from coming into contact with the skin, improving skin troubles.

[0093] In a preferred aspect of this embodiment, the back portion 2 further includes a pair of buttocks-covering portions 40 provided on the inside in the longitudinal direction L and at both ends in the width direction W. The buttocks-covering portions 40 include a non-bonded region 52. In this embodiment, the buttocks-covering portion 40 having the buttocks elastic member 41 includes a non-bonded region 52 extending in the width direction W. The non-bonded region 52 is formed between the separate sheet member 50 and the inner sheet member 21 at the inner ends in the longitudinal direction L of the outer sheet member 22, the separate sheet member 50, and the inner sheet member 21 that constitute the buttocks-covering portion 40.

[0094] In the present disposable diaper 1, since the buttocks-covering part 40 also has a non-bonded region 52, gathers are less likely to form in the inner sheet member 21 on the skin-contacting surface side of the buttocks-covering part 40, and wrinkles are less likely to occur on the skin-contacting surface. Therefore, even when sitting or moving the legs (walking, etc.), the buttocks-covering part 40 softens the contact with the skin of the buttocks and legs. This reduces chafing of the skin on the buttocks and legs, and improves skin troubles.

[0095] In a preferred embodiment of the present invention, in at least one of the abdominal portion 3 and the back portion 2, a plurality of non-bonded regions 52 are disposed in leg loop regions located on the outer side of each of both ends of the absorbent body 8 in the width direction W and on the inner side in the longitudinal direction L. In the present embodiment, two non-bonded regions 52 are disposed on each of the outer sides of the absorbent body 8 in the width direction W in the leg loop regions of the abdominal portion 3 and the back portion 2. Therefore, even if the leg loop regions of the abdominal portion 3 and / or the back portion 2 are pressed against the legs of the user when the disposable diaper 1 is worn, the non-bonded regions 52 function as buffer regions, thereby suppressing marks (rubber marks) of the waist elastic members 13, 12 that may be caused when the waist elastic members 13, 12 of the abdominal portion 3 and / or the back portion 2 are pressed against the skin of the user.

[0096] In a preferred embodiment of the present invention, at least one non-bonded region 52 is disposed in at least one of the abdominal portion 3 and the back portion 2, in a region on the outer side of each of both ends in the width direction W of the absorbent 8 and on the waist opening side, and in a region on the outer side of each of both ends in the width direction W of the absorbent 8 and on the leg opening side. However, the waist opening side region and the leg opening side region are the outer and inner regions in the longitudinal direction L, respectively, of the region in each of the abdominal portion 3 and the back portion 2 where the absorbent 8 overlaps with each of the abdominal portion 3 and the back portion 2 in the longitudinal direction L. In the present embodiment, one non-bonded region 52 is disposed in each of the waist opening side region and the leg opening side region. Therefore, when an infant puts on the disposable diaper 1, even if the infant is in a sitting position and the ventral portion 3 and / or the dorsal portion 2 are pressed against the infant, the non-bonded area 52 functions as a cushioning material, thereby preventing marks (rubber marks) from being left by the waist elastic members 13, 12 of the ventral portion 3 and / or the dorsal portion 2 pressing against the infant's skin.

[0097] In a preferred embodiment of the present invention, at least one of the abdominal portion 3 and the back portion 2 has an opening OH (described later). The non-bonded region 52 is disposed in at least one of the inner and outer regions in the longitudinal direction L and the inner and outer regions in the width direction W with respect to the opening OH. That is, the non-bonded region 52 may be disposed in the inner and / or outer regions in the longitudinal direction L with respect to the opening OH, or may be disposed in the inner and / or outer regions in the width direction W with respect to the opening OH. In the present embodiment, the back portion 2 has a plurality of openings OH, and the non-bonded region 52 is disposed in the outer region in the width direction W with respect to the opening OH. The waist non-bonded region 51 is disposed in the outer region in the longitudinal direction L with respect to the opening OH. Thus, the abdominal portion 3 and / or the back portion 2 have the opening OH in addition to the non-bonded region 52 (or the waist non-bonded region 51). As a result, the non-bonded regions 52 can reduce chafing of the skin, and the holes OH can expel sweat and moisture, thereby reducing stuffiness inside the disposable diaper 1. As a result, the disposable diaper 1 can further prevent skin troubles caused by stuffiness.

[0098] The following is a further description of the openings OH in this embodiment. The number, shape, size, position, and arrangement of the openings OH are not particularly limited and are appropriately selected according to the performance required for discharging sweat and moisture. The number of the openings OH may be, for example, 1 to 20, and preferably 4 to 10, depending on the size of the openings OH. The shape of the openings OH is not particularly limited, and may be, for example, a circle, an ellipse, a rectangle, a polygon, a rhombus, a heart, a star, a flower, an animal, a pinhole, or a slit. The size of the openings OH, defined as the diameter of the smallest circle surrounding the openings OH, may be, for example, 1 to 40 mm, preferably 5 to 35 mm, and more preferably 10 to 30 mm. The position of the openings OH may be, for example, a position that does not overlap with the absorbent body 4, or a position that is symmetrical with respect to the longitudinal center line CL. The arrangement of the openings OH depends on the number and size of the openings OH, but may be, for example, a row along the longitudinal direction L or the width direction W, a matrix along the longitudinal direction L and the width direction W, a staggered pattern, a checkerboard pattern, or tilted arrangements thereof.

[0099] In this embodiment, the number of holes OH in the back portion 2 is four, the shape of the holes OH is circular, and the size of the holes OH is 25 mm in diameter. The positions of the holes OH are on the outside of the end portion in the longitudinal direction L of the absorbent main body 4 in the back portion 2, and are symmetrical with respect to the longitudinal center line CL (two on the right side and two on the left side), and the arrangement of the holes OH is in a row along the width direction W.

[0100] In this embodiment, as described above, the opening OH is provided in the back part 2. In this case, the opening OH is an opening penetrating the inner sheet member 21 and the outer sheet member 22 of the back part 2. The back part 2 may have a back cover sheet member 42, in which case the back cover sheet member 42 may cover part or all of the opening OH. In addition, when the opening OH is provided in the ventral part 3, the opening OH is an opening penetrating the inner sheet member 31 and the outer sheet member 32 of the ventral part 3. The ventral part 3 may have a ventral cover sheet member 43, in which case the ventral cover sheet member 43 may cover part or all of the opening OH. Even in this case, since only one cover sheet member is used for covering, sweat and moisture can pass through more easily than when two sheets, an inner sheet member and an outer sheet member, are used for covering. Furthermore, it is also possible to reduce the basis weight of the cover sheet member.

[0101] In this embodiment, as described above, the openings OH are provided in the back portion 2. In this case, the waist elastic members 12 are not arranged at the openings OH or at the openings OH and their surrounding areas. This is to prevent the openings OH from shrinking and narrowing due to the shrinkage of the waist elastic members 12. However, even if the openings OH are provided in the back portion 2, the waist elastic members 12 may be arranged at the openings OH or at the openings OH and their surrounding areas. In this case, the waist elastic members 12 are stretched during use of the disposable diaper 1, so that breathability at the openings OH can be ensured, and the waist elastic members 12 can improve the fit.

[0102] When the abdominal portion 3 has an opening OH, the multiple waist elastic members 13 may not be arranged at the opening or at the opening and its surrounding area. This is to prevent the opening from shrinking and becoming narrower due to the contraction of the waist elastic members. Alternatively, when the abdominal portion 3 has an opening, the multiple waist elastic members 13 may be arranged at the opening or at the opening and its surrounding area. This is to ensure breathability at the opening when the disposable diaper 1 is used because the waist elastic members 13 are stretched, and the waist elastic members 13 improve the fit.

[0103] However, the area where the waist elastic members 12 are not arranged can be called a non-stretch area OHA, and the area where the waist elastic members 12 are arranged can be called a stretch area. Similarly, the area where the waist elastic members 13 are not arranged can be called a non-stretch area, and the area where the waist elastic members 13 are arranged can be called a stretch area. Note that the area where no elastic members are arranged is an area where the distance between adjacent waist elastic members is more than twice the distance in other areas, and therefore the stretch is smaller than in other areas. Therefore, in this embodiment, the multiple openings OH are located in the non-stretch area OHA in the back side portion 2.

[0104] In a preferred embodiment of the present invention, at least one of the ventral portion 3 and the dorsal portion 2 further includes a moisturizer SC (described later) applied to the skin contact surface. As a result, in the present disposable diaper 1, the non-bonded region 52 can reduce chafing of the skin, and the moisturizer SC can further suppress dryness and chafing of the skin. Therefore, in the present disposable diaper 1, skin troubles can be further suppressed.

[0105] The application of the moisturizer SC in this embodiment will be further described below. In a more preferred embodiment of this embodiment, at least one of the ventral part 3 and the back part 2 has the moisturizer SC applied to at least a part of the skin contact surface in the portion other than the opening OH (the moisturizer SC is not shown in FIG. 1). Here, the skin contact surface to which the moisturizer SC is applied is the surface of at least one of the ventral part 3 and the back part 2 that contacts the skin when worn.

[0106] In this embodiment, examples of the sheet members constituting the skin contact surface (skin side surface) of at least one of the ventral part 3 and the back part 2 include the inner sheet member 21 and the back cover sheet member 42 of the back part 2, and the inner sheet member 31 and the ventral cover sheet member 43 of the ventral part 3. The sheet members are separate from the ventral part 3 and the back part 2, but may further include, for example, the top sheet 7 of the absorbent main body 4, the leg sheet member 5b, and the leak-proof sheet member 6b. Therefore, the sheet member constituting the skin contact surface is at least one of the above-mentioned sheet members given as examples, and the skin contact surface is the surface of the above-mentioned sheet member that contacts the skin side. Each of these sheet members contains hydrophobic fibers in the surface portion of the skin contact surface, and further, a moisturizing agent SC is arranged (applied) on the surface portion of the skin contact surface.

[0107] However, the area where the moisturizer SC is applied on the sheet member, i.e., the application area, does not need to be the entire surface of the skin contact surface of the sheet member. The application area is, for example, at least 20% or more of the area of ​​the skin contact surface of the sheet member, preferably 40% or more, more preferably 60% or more, and even more preferably 80% or more. The sheet member to which the moisturizer SC is applied does not need to be one piece, and may be applied to multiple sheet members. The moisturizer SC may be applied continuously or intermittently to each sheet member. Examples of intermittent include stripes, checkerboard patterns, and lattices. The moisturizer SC may be applied independently to multiple locations on each sheet member.

[0108] The moisturizer SC is not particularly limited as long as it has a moisturizing effect, and is preferably colorless and transparent. In this embodiment, a hydrophilic moisturizer is described as an example, but a hydrophobic (oily) moisturizer may also be used. The hydrophilic moisturizer preferably contains a moisturizing component and water, and the main component of the hydrophilic moisturizing component is preferably glycerin, hyaluronic acid, urea, heparin-like substances, etc., which are components that can absorb moisture in the air and moisturize the skin, and glycerin, which is a hygroscopic moisturizer, is particularly preferred. Examples of oily moisturizers include ceramide and petrolatum, which suppress moisture evaporation from the skin. As an auxiliary for the moisturizing component, for example, a polyhydric alcohol having moisturizing properties and antibacterial action (antiseptic action) may further be included. Examples of polyhydric alcohols include butylene glycol, propylene glycol, dipropylene glycol, and propanediol. Furthermore, as an additive for the moisturizing component, for example, an agent having a pharmacological action such as an anti-inflammatory action or a detoxifying action may further be included. An auxiliary having an antibacterial (antiseptic) effect may also be called an antiseptic (antibacterial) auxiliary. In this embodiment, the moisturizing agent contains, for example, glycerin, water, and an auxiliary.

[0109] In the hydrophilic moisturizing agent, the ratio of each component is not particularly limited as long as the moisturizing effect is obtained. For example, the ratio of each component described above, under conditions of an air temperature of 20°C and a relative humidity of 60% RH, can be 40 to 80% by mass for the main moisturizing component, and 60 to 20% by mass for water, auxiliary agents, and additives other than the main component.

[0110] The present disposable diaper 1 has openings OH in at least one of the ventral portion 3 and the dorsal portion 2. Therefore, sweat and moisture can be discharged through the openings OH, thereby reducing stuffiness inside the disposable diaper 1. At the same time, since a moisturizer SC is applied to at least a part of the skin-contacting surface of at least one of the ventral portion 3 and the dorsal portion 2 other than the openings OH, the moisture of the skin can be supplemented, thereby reducing dryness of the skin due to the discharge of sweat and moisture. In this way, by using the openings OH and the moisturizer SC in combination in the present disposable diaper 1, it is possible to reduce both stuffiness and dryness, thereby suppressing skin troubles and improving comfort.

[0111] In a preferred embodiment of the present invention, as shown in Figs. 4 and 6, the leg gathers 5 have a non-bonded region 52 in an end region 5F on the extension line in the longitudinal direction L. However, Fig. 6 is a cross-sectional view of the end region 5F on the extension line in the longitudinal direction L of the leg gathers 5 in Fig. 4, seen from the inside in the longitudinal direction L. Specifically, it is as follows. The absorbent main body 4 has a pair of leg gathers 5 located at both ends in the width direction W and including a plurality of leg elastic members 5a (leg-around elastic members) extending along the longitudinal direction L. Each of the pair of leg gathers 5 has a leg sheet member 5b-2 (first sheet member) that is closest to the skin and a leg sheet member 5b-1 (second sheet member) adjacent to the leg sheet member 5b-2 in the thickness direction T in the end region 5F on the extension line, which is a region on the extension line in the longitudinal direction L where each of the plurality of leg elastic members 5a extends. Each of the pair of leg gathers 5 further includes a moisturizing agent SC applied to the skin-facing side of the leg sheet member 5b-2, and another non-bonded region 52 where at least a part of the leg sheet member 5b-2 and at least a part of the leg sheet member 5b-1 are not bonded, in the upper end region 5F of the extension line in the longitudinal direction L. In addition, another bonded region 53 is formed on the inside of the non-bonded region 52 in the width direction W.

[0112] In this way, in the leg gathers 5 of the disposable diaper 1, the moisturizing agent SC is applied to the skin-facing side of the leg sheet member 5b-2 in the extension line upper end region 5F on the extension line of the longitudinal direction L along which the leg elastic members 5a extend. Furthermore, a non-bonded region 52 is formed in which the leg sheet member 5b-2 and the leg sheet member 5b-1 are not bonded. Therefore, the leg sheet member 5b-2 in the extension line upper end region 5F on the extension line of the leg elastic members 5a is less susceptible to wrinkles from the leg sheet member 5b-1 (where the leg elastic members 5a are bonded), and wrinkles are less likely to occur on the skin-contacting surface, so that the wearer's skin is less likely to receive pressure marks from the gathers. Furthermore, the leg sheet member 5b-2 is applied with a moisturizing agent. As a result, the disposable diaper 1 can suppress skin troubles.

[0113] The method for determining whether a moisturizing agent is hydrophilic or hydrophobic and the method for determining the component ratio are as follows. <Method of measuring hydrophilicity / hydrophobicity of moisturizers and method of measuring component ratio> (1) A portion of the nonwoven fabric to which a moisturizer has been applied is cut out to a specified size (e.g., 5 cm x 5 cm). (2) The cut nonwoven fabric is immersed in a beaker containing a predetermined amount of water (e.g., 500 ml) to dissolve the moisturizer in the water. (3) The water used for extraction is evaporated under reduced pressure (evaporator) under heating to concentrate the moisturizing agent components. If there are no extracted components (nothing precipitates) after the water has evaporated, the moisturizing agent is hydrophobic. (4) If the moisturizer is hydrophilic (if the components have been extracted), leave the water in which the moisturizer has been dissolved in a beaker at a temperature of 20°C and a relative humidity of 60% for four weeks. (5) After aging, the sample is analyzed using a liquid chromatography-mass spectrometry (LC-MS) to analyze the water in which the moisturizer has been dissolved and measure the mass of each component. (6) Calculate the ratio of each component (excluding moisture) from the obtained components and their masses. When it is desired to measure the moisture ratio as well, the following measurement is carried out in addition to the above (1) to (5). (7) Separately, carry out steps (1) and (2) above, and leave the water with the moisturizer dissolved in it in a beaker for a while at an air temperature of 20°C and a relative humidity of 60%RH. The water evaporates, and a mixture (moisturizer containing water) is produced that contains the amount of water that it can contain under conditions of an air temperature of 20°C and a relative humidity of 60%RH. The mass of the mixture is measured together with the beaker. (8) Then, place the beaker containing the mixture in a dryer to evaporate the water from the mixture, and measure the mass of the beaker again, thereby determining the mass of the water. (9) Calculate the ratio of each component (including moisture) from the mass of each component obtained in (3) above and the mass of moisture obtained in (8) above. (10) If the moisturizer is confirmed to be hydrophobic in (3) above, the extractions in (1) and (2) above are carried out using an organic solvent of your choice, and various measurements are carried out according to (5) to (9).

[0114] There is no particular restriction on the basis weight of the moisturizer as long as it can exert a skin care effect. 2 More than 3.9g / m 2 It is preferable that the moisturizing agent is less than the lower limit (0.3 g / m 2 ) or more, the moisturizer's effect can be fully obtained. 2 ) or less, it is possible to prevent the moisturizer from becoming sticky when worn and also to prevent the moisturizer from getting caught on the legs, making it difficult to put on the disposable diaper 1. Therefore, it is possible to achieve both skin care effects and ease of putting on with an optimal amount of moisturizer.

[0115] The method for measuring the basis weight of the moisturizing agent is as follows. <Method for measuring the basis weight of moisturizing agent> (1) A portion of the nonwoven fabric of a disposable diaper to which a moisturizer has been applied is cut to a specified size (e.g., 5 cm x 5 cm) and the mass is measured. (2) The cut nonwoven fabric is immersed in a beaker containing a predetermined amount of water (e.g., 500 ml). (3) The nonwoven fabric is immersed in water and is repeatedly poked and stirred with a glass rod for at least 5 minutes, and then left to stand in the water for 60 minutes. (4) After that, thoroughly squeeze out the water from the nonwoven fabric, dry it in an oven at or above 50 degrees for 24 hours, and measure the mass. (5) The mass of the moisturizer applied to the nonwoven fabric is calculated from the difference between the mass of the nonwoven fabric after drying and the mass of the nonwoven fabric before immersion in water. The mass of the moisturizer is divided by the area of ​​the nonwoven fabric to obtain the basis weight of the moisturizer. (6) If the moisturizing agent is hydrophobic, the nonwoven fabric cut out in (2) is immersed in a beaker using a predetermined amount of any organic solvent, and then (3) to (5) are carried out in the same manner.

[0116] The moisturizer SC may be applied to the entire skin-contacting surface of at least one of the ventral portion 3 and the back portion 2, and to the entire skin-contacting surface of the absorbent main body 4 overlapping in the thickness direction T with at least one of the ventral portion 3 and the back portion 2. In other words, the moisturizer SC may be applied to the entire skin-contacting surfaces of the ventral portion 3 and the back portion 2 that do not overlap with the absorbent main body 4 in the thickness direction T, and to the entire skin-contacting surfaces of the absorbent main body 4 that overlap with the ventral portion 3 and the back portion 2 in the thickness direction T. When a ventral cover sheet member 43 or a back cover sheet member 42 is used, the moisturizer SC may be applied to the skin-contacting surface thereof.

[0117] Alternatively, the moisturizer SC may be applied in a predetermined pattern to the abdominal portion 3, the dorsal portion 2 and a part of the skin contact surface of the absorbent body 4, as exemplified in Fig. 7. Fig. 7 is a plan view in a developed state showing an example of application of the moisturizer SC (an example of a predetermined pattern) in the disposable diaper 1 according to the embodiment. Fig. 7 shows the disposable diaper 1 of Fig. 1 in a schematic manner.

[0118] 7, the moisturizer SC is applied to the skin-contacting surfaces of the areas excluding the outer and inner ends in the longitudinal direction L of the ventral part 3 and the back part 2, and to the skin-contacting surfaces of the absorbent main body 4 in areas overlapping with the ventral part 3 and the back part 2 in the thickness direction T. Not applying the moisturizer SC to the outer ends in the longitudinal direction L of the ventral part 3 and the back part 2 makes it difficult for clothing fibers to adhere to the outer ends, and not applying the moisturizer SC to the inner ends makes it difficult for floor dust to adhere to the inner ends.

[0119] 7, the moisturizer SC is removed from the non-stretchable area OHA (when the back cover sheet member 42 is used, the area overlapping with the non-stretchable area OHA in the thickness direction T of the back cover sheet member 42) in the back part 2. By not applying the moisturizer SC to the non-stretchable area OHA (or the back cover sheet member 42 overlapping with this area), it is possible to make it difficult for the moisturizer SC to diffuse to the non-skin side through the openings OH.

[0120] As another example of a different pattern, for example, the above-mentioned different pattern may be obtained by further removing the moisturizer SC from the back portion 2 in the region of the absorbent main body 4 that overlaps with the ventral portion 3 and the back portion 2 in the thickness direction T. By not applying the moisturizer SC to the absorbent main body 4, the effect of the moisturizer SC on the absorption performance of the absorbent main body 4 can be suppressed.

[0121] In each of the above patterns, the pattern of the moisturizer SC in the dorsal portion 2 may be applied to the ventral portion 3, or the pattern of the moisturizer SC in the ventral portion 3 may be applied to the dorsal portion 2. In each of the above patterns, the moisturizer SC may be applied to only one of the ventral portion 3 and the dorsal portion 2.

[0122] In the present disposable diaper 1, a hydrophilic moisturizer SC may be applied to the hydrophobic surface portions of the sheet members (for example, the inner sheet member 21, the dorsal cover sheet member 42, the inner sheet member 31, the ventral cover sheet member 43, the top sheet 7, the leg sheet member 5b and the leakproof sheet member 6b). In this case, after application, the moisturizer SC is not absorbed by the sheet members and is likely to remain on the surface portions. As a result, the moisturizer SC remains on the surface portions of the sheet members even during use, so that the effect of the moisturizer SC on the skin can be fully obtained.

[0123] The hydrophilicity of the sheet member (sheet) is evaluated by the following method. <Method for evaluating hydrophilicity of sheet member> (1) A sheet material used in disposable diapers is cut to a predetermined size (for example, 50 mm x 50 mm) and placed on an acrylic plate. (2) Drop 0.05 mL of colored water onto the cut-out sheet member from 30 mm above. After 10 minutes, measure the diffusion area of ​​the colored water using an image analyzer. The larger the measured value, the more hydrophilic the material is determined to be.

[0124] The disposable diaper of the present invention is not limited to the above-described embodiment, and can be appropriately combined or modified with known techniques, etc., within the scope of the object and spirit of the present invention. [Explanation of symbols]

[0125] 1. Disposable diapers (absorbent articles) 2 Dorsal part 3 Ventral part 4. Absorbent body 8. Absorber 13, 12 Elastic member 31, 21 Inner seat 32, 22 Outer sheet 50 Separate sheet 52 Non-bonded area 53 Joint area

Claims

1. An absorbent article having a longitudinal direction, a width direction and a thickness direction which are mutually orthogonal in an unfolded state, comprising an abdominal side portion covering the abdomen of a wearer, a back side portion covering the back, and an absorbent main body covering a crotch area and including an absorbent body, wherein the absorbent main body has front and rear end portions in the longitudinal direction which extend to central portions in the width direction of the abdominal side portion and the back side portion, respectively; Each of the ventral portion and the dorsal portion is An inner sheet that constitutes a skin contact surface; an outer sheet positioned on the non-skin side of the inner sheet; Equipped with At least one of the ventral portion and the dorsal portion is a separate sheet positioned between the outer sheet and the inner sheet; a plurality of elastic members positioned between the outer sheet and the separate sheet, joined to the outer sheet and the separate sheet, and extending along the width direction; a non-bonded region located inside the waist region in the longitudinal direction, where the inner sheet and the separate sheet are not bonded to each other; a bonded region adjacent to the non-bonded region and in which the inner sheet and the separate sheet are bonded; Including, Absorbent articles.

2. At least one of the ventral portion and the dorsal portion, At least one of the non-bonded regions is disposed on the outer side of each of both ends in the width direction of the absorbent body. The absorbent article of claim 1.

3. At least one of the ventral portion and the dorsal portion, The non-bonded regions are arranged in pairs on the outer sides of both ends in the width direction of the absorbent body.

3. The absorbent article according to claim 1 or 2.

4. The non-bonded region overlaps with at least one of the plurality of elastic members in the thickness direction.

3. The absorbent article according to claim 1 or 2.

5. At least one of the abdominal portion and the dorsal portion has, in the waist region, a waist joining region formed by joining an end portion of the outer sheet in the longitudinal direction, the end portion being folded back so as to cover the end portion of the inner sheet in the longitudinal direction, and the inner sheet; a waist non-joined region in which the folded-back portion of the outer sheet and the longitudinal outer end portion of the inner sheet are not joined; Further comprising:

3. The absorbent article according to claim 1 or 2.

6. The upper limit of the length of the waist non-joined region in the longitudinal direction is a length at which the inner position of the waist non-joined region in the longitudinal direction does not overlap with the non-joined region. The absorbent article of claim 5.

7. The waist non-bonded region overlaps with an outer end portion of the absorbent body in the longitudinal direction in the thickness direction. The absorbent article of claim 5.

8. The waist non-bonded region overlaps with at least one of the plurality of elastic members bonded to the outer sheet in the thickness direction. The absorbent article of claim 5.

9. Further provided is a pair of side seal portions formed by joining both ends in the width direction of the ventral side portion and both ends in the width direction of the back side portion along the longitudinal direction, The non-bonded region is adjacent to the side seal portion.

3. The absorbent article according to claim 1 or 2.

10. The back side portion further includes a pair of buttocks covering portions provided on the inner side in the longitudinal direction and on both ends in the width direction, The buttocks-covering portion includes the non-bonded region.

3. The absorbent article according to claim 1 or 2.

11. At least one of the ventral side portion and the dorsal side portion further includes a moisturizing agent applied to the skin contact surface.

3. The absorbent article according to claim 1 or 2.

12. At least one of the ventral portion and the dorsal portion has an aperture portion, The non-bonded region is disposed in at least one of an inner region and an outer region in the longitudinal direction and an inner region and an outer region in the width direction with respect to the opening portion.

3. The absorbent article according to claim 1 or 2.

13. The absorbent body includes a pair of leg gather portions each including a leg-around elastic member located at both ends in the width direction and extending along the longitudinal direction, Each of the pair of leg gathers has an extension line end region, which is a region on the longitudinal extension line of the leg-around elastic member, A first sheet member that is closest to the skin; a second sheet member adjacent to the first sheet member in the thickness direction; A moisturizing agent applied to the skin-facing side of the first sheet member; another non-bonded region where the first sheet member and the second sheet member are not bonded; Equipped with 3. The absorbent article according to claim 1 or 2.

14. At least one of the ventral portion and the dorsal portion, The non-bonded regions are arranged in a plurality in leg opening regions located on the outer side of each of both ends in the width direction of the absorbent body and on the inner side in the longitudinal direction.

3. The absorbent article according to claim 1 or 2.

15. At least one of the ventral portion and the dorsal portion, At least one non-bonded region is disposed in each of the regions on the outer sides of both ends in the width direction of the absorbent body and on the waist opening side, and at least one non-bonded region is disposed in each of the regions on the outer sides of both ends in the width direction of the absorbent body and on the leg opening side.

3. The absorbent article according to claim 1 or 2.

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