Underwear absorbent articles

Abstract

A pant-type absorbent article (1) comprises: an absorbent body (10); a waist member (20) provided with a front waist portion (20f) and a rear waist portion (20b); and a joining member (30) having a base end joined to the waist member (20) and having a joining portion (32) on the distal end side. The front waist portion (20f) is joined to the rear waist portion (20b). When the joining portion (32) is joined to the front waist portion (20f), the lower end (30ebn) of the side edge (30eb) on the base end side of the joining member (30) is located below the lower end (20fen) of the side edge (20fe) of the front waist portion (20f), and a portion of the lower edge (20feg) of the front waist portion (20f) and a portion of the lower edge (30ge) of the joining member (30) partially define a leg opening (1b).

Description

Technical Field

[0001] The present invention relates to a pant-type absorbent article. Background Art

[0002] Conventionally, in absorbent articles such as underwear-type (pants-type) disposable diapers, the front waist and the rear waist are joined by a joint formed in the transverse ends. However, in many cases, in order to reduce the discomfort of the wearer when walking, etc., the absorbent article is designed to have a shorts-like shape by making the longitudinal length of the waist member shortest at the position of the joint. For example, patent document 1 discloses an absorbent article that can be put on by engaging and installing the joint members provided on the waist located on the ventral and dorsal sides of the absorbent pad with the joints provided on the ventral and dorsal sides of the waistband. In addition, patent document 2 discloses an absorbent article, wherein the portion of each leg opening located closest to the waist opening side is provided at a position close to the absorbent body in the transverse direction, rather than at the position of the joint formed in the transverse ends of the waist.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2012-029814

[0006] Patent Document 2: Re-publication of PCT International Publication No. WO2008 / 066008 Summary of the invention

[0007] Problem that the invention aims to solve

[0008] When the wearer walks under the state of wearing the absorbent product with the structure as in patent document 1 and patent document 2, the lower edge of the front waist portion is the part to which force is applied due to the friction of the thickest part of the wearer's thigh, and the lower edge (i.e., the front leg opening) extends toward the crotch of the wearer from the lower end of the joint where the front waist member and the back waist member are joined. Therefore, the front waist portion is stretched in the left and right directions, and force is applied to the joint. This may cause the waist member to harden and may cause discomfort around the thigh. However, if the longitudinal length of the waist member is made shorter in order to reduce the friction with the thigh, the risk of making the wearer uneasy and the risk of tearing the waist member are increased.

[0009] Furthermore, in a case where the deepest portion on the waist opening side is not located in the above-mentioned joining portion, as in the absorbent article of Patent Document 2, if such a portion is formed only by cutting the shape during manufacturing, that is, if an attempt is made to achieve a structure in which such a deepest portion is the narrowest in the longitudinal direction and widens in the direction from the narrowest portion toward the joining portion relative to the longitudinal direction only by cutting, there is a risk of warping occurring in a direction orthogonal to the line because line tension is not easily applied to the widened portion near the joining portion.

[0010] The present invention has been achieved in view of the above-mentioned problems, and an object of the present invention is to provide a pant-type absorbent article which is less likely to cause lifting and discomfort around the thighs of the wearer during use.

[0011] Solutions for solving problems

[0012] A pant-type absorbent article having an up-down direction, a left-right direction, and a front-to-back direction intersecting with each other, the pant-type absorbent article comprising: an absorbent body; a waist member configured to be stacked on the absorbent body in the front-to-back direction, and comprising a front waist portion and a rear waist portion; and a joining member, in which the base end side is joined to the waist member and has a joining portion on the distal side, the front waist portion and the rear waist portion are joined to each other, and when the joining portion is joined to the front waist portion, the lower end of the side edge of the base end side of the joining member is located below the lower end of the side end of the front waist portion, and a portion of the lower edge of the front waist portion and a portion of the lower edge of the joining member define a portion of a leg opening.

[0013] Other features of the present invention will become apparent by referring to the accompanying drawings and description of the specification.

[0014] Effects of the Invention

[0015] According to the present invention, it is possible to provide a pant-type absorbent article in which lifting and discomfort are less likely to occur around the thighs of the wearer during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] [ Figure 1 ] Figure 1 It is a schematic perspective view of the diaper 1 according to this embodiment.

[0017] [ Figure 2 ] Figure 2 It is a plan view of the diaper 1 in the unfolded and stretched state as seen from the skin side in the thickness direction.

[0018] [ Figure 3 ] Figure 3 It is along Figure 2 Schematic cross-sectional view taken along line AA in FIG.

[0019] [ Figure 4 ] Figure 4 A and Figure 4 B is a diagram for explaining the operation of separating the waist member 20 of the diaper 1 into the front waist portion 20f and the rear waist portion 20b.

[0020] [ Figure 5 ] Figure 5 This is a developed plan view of the diaper 1 in a state where the waist member 20 is separated along the separation portions 25 located on both sides in the left-right direction.

[0021] [ Figure 6 ] Figure 6 It is an enlarged view of a part of the diaper 1 in a natural state.

[0022] [ Figure 7 ] Figure 7 yes Figure 6 A simplified view of the lower portion of the tab 30 is shown in FIG.

[0023] [ Figure 8 ] Figure 8 1 is a schematic plan view of the diaper 1 in a developed and stretched state as seen from the skin side, in which the tab 30 already in the product state is opened toward the left-right direction outside.

[0024] [ Fig. 9 ] Fig. 9 1 is a plan view showing a state in which the diaper 1 in the tape-type state is made into the underpants-type state again and stretched. DETAILED DESCRIPTION

[0025] At least the following matters will become clear through the description of this specification and the accompanying drawings.

[0026] A pant-type absorbent article having an up-down direction, a left-right direction, and a front-to-back direction intersecting with each other, the pant-type absorbent article comprising: an absorbent body; a waist member configured to be stacked on the absorbent body in the front-to-back direction, and comprising a front waist portion and a rear waist portion; and a joining member, in which the base end side is joined to the waist member and has a joining portion on the distal side, the front waist portion and the rear waist portion are joined to each other, and when the joining portion is joined to the front waist portion, the lower end of the side edge of the base end side of the joining member is located below the lower end of the side end of the front waist portion, and a portion of the lower edge of the front waist portion and a portion of the lower edge of the joining member define a portion of a leg opening.

[0027] According to the above-mentioned underwear type absorbent article, a part of the lower edge of the joining member defines a part of the leg opening, so the part of the lower end of the joining member that protrudes downward beyond the side end of the front waist portion is easy to go along the thigh. Conventionally, if the lower edge of the front waist portion contacts the thigh when walking, the front waist portion may be pulled in the left and right directions, causing warping or discomfort. However, the part of the joining member that protrudes downward beyond the lower end of the front waist portion is a free end, because this part is joined to the waist member on the base end side, but not on the distal end side. Therefore, its tension is lower than the tension of the waist member. Therefore, even if the thigh contacts such a protrusion, discomfort is not likely to occur. In addition, even if the length of the front waist portion in the up and down direction is short, the provision of the joining member can also give the wearer a sense of security. This can make the front waist portion not easy to tear.

[0028] In such a pant-type absorbent article, it is desirable that in a joined state, the joining member includes a protrusion that protrudes downward in the up-down direction beyond the lower edge of the front waistline portion, and the side end portion on the base end side of the protrusion is joined to the rear waistline portion.

[0029] According to the above-mentioned underpants type absorbent article, even in the case where the protrusion of the engaging member contacts the thigh during use of the underpants type absorbent article, one end portion of the protrusion (the side end portion on the base end side) can be firmly pressed, and this makes it difficult for the one end portion to rise up because the one end portion is engaged with the rear waist portion. In addition, the engaged portion has high rigidity, so even if the protrusion is provided on the engaging portion, such portion is not easy to rise up.

[0030] In such a panty-type absorbent article, it is desirable that the joining member is arranged on the non-skin side of the front waist portion, and in the joined state, the upper edge of the front waist portion defines a portion of the waist opening, and the upper edge of the joining member is located below the upper edge of the front waist portion.

[0031] According to the above-mentioned underwear type absorbent article, when the joining member protrudes beyond the edge of the waist opening, there is the risk of discomfort caused by the protruding part contacting the skin. However, the joining member is arranged below the non-skin surface side and the upper edge of the front waist portion so as to suppress the generation of this discomfort.

[0032] In such an underpants-type absorbent article, it is desired that when the underpants-type absorbent article is stretched and unfolded by opening the joining member toward the outside in the left-right direction, the underpants-type absorbent article has a longitudinal and left-right direction, and with respect to the central position in the left-right direction between the side end of one side in the left-right direction of the absorbent body and the side end of one side in the left-right direction of the waist member, the longitudinal length of the waist member on the side end of the one side of the absorbent body relative to the central position is longer than the longitudinal length of the waist member at the central position.

[0033] According to this underpants type absorbent article, the thighs are easily moved during its use, so that discomfort can be alleviated. In addition, making the length of the absorbent main body side longer prevents groin exposure and alleviates anxiety about leakage.

[0034] In such a panty-type absorbent article, it is desired that, in the joined state, the joining member includes a protrusion that protrudes downward in the up-down direction beyond the lower edge of the front waistline portion, and the length of the protrusion in the up-down direction is longest at the side end portion on the base end side of the joining member.

[0035] According to the above-mentioned underwear type absorbent article, the length of the waist member in the vertical direction becomes longer as it goes toward the center (inner side) in the left-right direction, that is, the length in the vertical direction becomes longer toward the side where the wearer's thigh gradually becomes thinner. Therefore, it is preferred that the protrusion becomes smaller as it goes toward the inner side in the left-right direction. This makes it easier for the protrusion to go along the thigh. In addition, this structure of the protrusion makes the appearance look neat.

[0036] In such an underpants-type absorbent article, it is desired that a pair of separation portions are provided on both sides of the front waist portion in the left-right direction before the underpants-type absorbent article is put on, each of the pair of separation portions is used to separate the waist member into a portion of the front waist portion including at least a central portion and a portion of the rear waist portion including at least a central portion, the joining member is arranged on the non-skin side of the front waist portion and covers at least a portion of the separation portion, and the upper end of the separation portion is located above the upper end of the joining member.

[0037] According to the above-mentioned underpants-type absorbent article, the separation portion can be visually recognized before putting on the underpants-type absorbent article, which makes it easier for the wearer to determine at which position to tear the front waist portion.

[0038] In such a pant-type absorbent article, it is desirable that at least a portion of the lower edge of the joining member has a curved portion, and in the joined state, the curved portion extends from the outer side in the left-right direction toward the inner side in the left-right direction and toward the upper side in the up-down direction.

[0039] According to the above-mentioned underpants type absorbent article, when the engaging member is engaged with the front waist part in a state where the engaging member is pulled inwardly in the left-right direction, the curved portion of the lower edge of the engaging member extends inwardly in the left-right direction and upwardly, so that the force for pulling the engaging member is more easily transmitted to the same direction (towardly inwardly in the left-right direction and upwardly). Therefore, it is easier to pull in the same direction. In addition, by providing such a curved shape, the outer shape of the underpants type absorbent article can look neat.

[0040] In such an underpants-type absorbent article, it is desired that the rear waist portion includes a rear leg elastic member extending along the lower edge portion in the up-down direction, the rear leg elastic member extending from the inner side in the left-right direction toward the outer side in the left-right direction and upward along the rear side of the leg circumference, and in a state where the waist member is separated along the separation portion into a portion of the front waist portion including at least the central portion and a portion of the rear waist portion including at least the central portion, the joining members are located on both sides of the rear waist portion in the left-right direction, and in a state where the joining members are unfolded in the left-right direction, the curved portions included in the lower edges of each joining member extend from the inner side in the left-right direction toward the outer side in the left-right direction and upward.

[0041] According to the above-mentioned underwear type absorbent article, after separation, the engaging member is pulled and engaged with the front waist portion. The extending direction of the rear leg elastic member and the extending direction of the curved portion of the engaging member are the same, so the force for pulling the engaging member is easily linked to the rear leg elastic member. Therefore, this makes it possible to enhance the fit.

[0042] In such an underpants-type absorbent article, it is desired that the joining member is arranged on the non-skin side of the front waist portion, at least a portion of the lower edge of the joining member has a curved portion, and in a joined state, the lower edge of the joining member has an inflection point, at which the curved portion changes from being convex upward to being convex downward, and the inflection point is located above the lower end of the front waist portion.

[0043] According to the above-mentioned underwear type absorbent article, when the inflection point is located below the lower end of the front waist portion, there is a risk that the inflection point portion of the engaging member contacts the thigh and causes discomfort. However, the inflection point is located above the lower end of the front waist portion, which makes it possible to prevent the occurrence of such discomfort.

[0044] In such an underpants-type absorbent article, it is desired to provide an intersection point when the joining member is joined after being stretched, the intersection point being the point where the lower edge of the joining member and the lower edge of the front waistline portion intersect, and the maximum value of the curvature of the curve along the lower edge of the joining member extending from the intersection point toward the outside in the left-right direction and toward the bottom in the up-down direction is greater than the maximum value of the curvature of the curve along the lower edge of the front waistline portion extending from the intersection point toward the inside in the left-right direction and toward the bottom in the up-down direction.

[0045] According to the above-mentioned underpants type absorbent article, the outward appearance can be made more like shorts. In addition, even when the engaging member is further engaged inwardly in the left-right direction, it is easy to ensure the protrusion of the engaging member relative to the front waist portion with a small curvature (that is, the bend is gentle).

[0046] In such a panty-type absorbent article, it is desired that in the joined state, the joining member includes a protrusion that protrudes downward beyond the lower edge of the front waistline portion in the up-down direction, and in the left-right direction, at least a portion of the joining portion of the joining member is located on the inner side of the inner end of the protrusion.

[0047] According to the above-mentioned underpants-type absorbent article, one end of the engaging member on the distal side (the side where the engaging portion is provided) is a so-called free end. Therefore, if the protrusion is provided to extend to the inner side of the engaging portion in the left-right direction, there is a risk that the protrusion is easily lifted when the force of the wearer's legs is applied to the protrusion. By configuring the engaging portion to be arranged on the inner side of the inner end of the protrusion, it is possible to prevent the protrusion from being easily lifted.

[0048] In such a panty-type absorbent article, it is desired that the joining member is arranged on the non-skin side of the front waist portion, and in the joined state, the joining member includes a protrusion that protrudes downward in the up-down direction beyond the lower edge of the front waist portion, and the protrusion includes a plurality of compression portions.

[0049] According to the above-mentioned underpants-type absorbent article, the compressed portion increases the rigidity of the protruding portion and makes it possible to prevent the lifting.

[0050] ===Implementation Method===

[0051] Hereinafter, a pant-type diaper 1 (hereinafter, also simply referred to as "diaper 1") will be explained as an example of an absorbent article according to the present invention. It should be noted that the absorbent article includes a pant-type diaper and the like.

[0052] <Basic Structure of Diaper 1>

[0053] Figure 1It is a schematic perspective view of the diaper 1 according to this embodiment. Figure 2 It is a plan view of the diaper 1 in the unfolded and stretched state as seen from the skin side in the thickness direction. Figure 3 It is along Figure 2 Schematic cross-sectional view taken along line AA in FIG.

[0054] It should be noted that the "stretched state" of the diaper 1 refers to a state in which the entire diaper 1 (the entire product) is stretched without wrinkles by stretching each elastic member included in the diaper 1 (for example, the absorbent elastic member 50, the skin side sheets 22 and 23, etc. described later), specifically, the diaper 1 is stretched to a state in which the size of the constituent members of the diaper 1 (for example, the non-skin side sheet 21, the skin side sheets 22 and 23, etc. described later) is consistent with or close to the size of the member itself. It should be noted that in the present embodiment, when comparing the absorbent body 10 part, it is preferred to perform measurement and comparison in a state in which the tab 30 is disengaged (in a peeled state) and in a panty-type state (in a state before the diaper 1 is torn at the tear line 25). In the tab 30, the measurement can be performed after the diaper 1 is unsealed or in a disengaged state. In addition, the above-mentioned measurement method is an example, and the measurement can be performed by other measurement methods.

[0055] like Figure 1 As shown in FIG. 1 , the diaper 1 has a "vertical direction", a "left-right direction" and a "front-back direction" which are orthogonal to each other. Figure 3 As shown, the diaper 1 has a "thickness direction" in which components are stacked one on another. In the up-down direction, in a state where the wearer puts on the diaper 1, the side corresponding to the waist of the wearer is the "upper side", and the side corresponding to the crotch of the wearer is the "lower side". Furthermore, in the front-back direction, the side corresponding to the abdomen of the wearer during use of the diaper is the "front side", and the side corresponding to the back of the wearer is the "rear side". Furthermore, in the thickness direction, in a state where the wearer puts on the diaper 1, the side in contact with the skin of the wearer is the "skin side", and the side opposite thereto is the "non-skin side".

[0056] In addition, Figure 2 In the unfolded state shown, the diaper 1 has a "longitudinal direction" and a "lateral direction" which are orthogonal to each other. The "longitudinal direction" is a direction along the up-down direction in the underpants-type state, and the "lateral direction" is a direction in the same direction as the lateral direction in the underpants-type state.

[0057] The diaper 1 of this embodiment includes: a liquid-absorbent absorbent body 10, which absorbs excretion fluid such as menstrual blood; a waist member 20, which is configured to be stacked on the absorbent body 10 in the front-to-back direction and is configured around the wearer's waist during the use of the diaper 1; and tabs 30 (corresponding to the joining member), which are arranged on both sides of the waist member 20 in the left and right directions.

[0058] (Absorbent body 10)

[0059] like Figure 2 As shown in FIG. 1 , the absorbent body 10 is in a generally rectangular shape in a plan view, wherein the longitudinal direction extends along the up-down direction of the diaper 1. Figure 3 As shown, the absorbent body 10 includes: an absorbent core 11 extending in the longitudinal direction (up and down direction); a front sheet 12 arranged on the skin side relative to the absorbent core 11; and a back sheet 13 arranged on the non-skin side relative to the absorbent core 11. However, the absorbent body 10 may include other sheet members. For example, in the thickness direction, a second sheet (not shown) may be provided between the front sheet 12 and the absorbent core 11.

[0060] The absorbent core 11 is a member that absorbs and holds liquids such as menstrual blood, and is formed of, for example, liquid-absorbent fibers (e.g., pulp fibers) mixed with superabsorbent polymers (SAP). It should be noted that the outer peripheral surface of the absorbent core 11 may be covered with a liquid-permeable sheet member (core wrap sheet) such as tissue paper or a nonwoven sheet.

[0061] The front sheet 12 is a liquid-permeable sheet member capable of coming into contact with the skin of the wearer during use of the diaper, and is formed of, for example, a hydrophilic air-permeable nonwoven fabric sheet or a spunbonded nonwoven fabric sheet.

[0062] The back sheet 13 is formed to have a two-layer structure, including: a liquid-impermeable sheet 13a, which is used to suppress the leakage of liquid such as menstrual blood absorbed by the absorbent core 11 to the outside; and a hydrophobic sheet 13b, which is arranged on the non-skin side of the liquid-impermeable sheet 13a. As the liquid-impermeable sheet 13a, for example, a resin film or the like is used, and as the hydrophobic sheet 13b, for example, a flexible nonwoven fabric sheet is used. However, the hydrophobic sheet 13b is not necessarily provided, and the back sheet 13 may be constructed with only the liquid-impermeable sheet 13a.

[0063] In addition, leakage-proof walls (not shown) may be provided on both sides in the left-right direction of the absorbent body 10. The leakage-proof walls are portions corresponding to so-called three-dimensional gathers. During use of the diaper 1, the leakage-proof walls stand up from both sides in the left-right direction of the absorbent body 10 toward the skin side of the wearer, thereby suppressing excretion fluid such as menstrual blood from leaking to the outside of the absorbent body 10.

[0064] In addition, if Figure 2 and Figure 3 As shown in FIG. 1 , in the absorbent body 10 of this embodiment, a plurality of absorbent elastic members 50 that stretch in the longitudinal direction (up and down direction) are provided. Each of the absorbent elastic members 50 is formed of, for example, elastic wires, and is arranged on the non-skin side (at the bottom) relative to the absorbent core 11. Figure 3In the diaper 1 of this embodiment, five absorbent elastic members 50 are provided at predetermined intervals in the left-right direction (see FIG. Figure 2 Due to the stretchability exhibited by the absorbent elastic member 50, the absorbent body 10 is pulled up toward the skin side of the wearer, and therefore, the absorbent body 10 is easily in close contact with the crotch of the wearer, making it difficult for excrement such as menstrual blood to leak.

[0065] (waist member 20)

[0066] The waist member 20 is an outer body constructed of a plurality of sheet members, and the waist member 20 includes at least a non-skin side sheet 21 and skin side sheets 22 and 23 (see FIG. Figure 3 ). In addition, in the following description, the portion of the waist member 20 located on the longitudinal front side (ventral side) relative to the longitudinal center position CL is referred to as the front waist portion 20f, and the portion of the waist member 20 located on the longitudinal rear side (dorsal side) relative to the longitudinal center position CL is also referred to as the rear waist portion 20b. The front waist portion 20f is the portion that contacts the ventral side of the wearer's body during use of the diaper 1. In addition, the rear waist portion 20b is the portion that contacts the dorsal side of the wearer's body during use of the diaper 1.

[0067] The non-skin side sheet 21 is a non-stretchable sheet member disposed closest to the non-skin side of the diaper 1 and is formed of, for example, a spunbonded nonwoven fabric or an SMS nonwoven fabric. Figure 2 As shown in the plan view of , the non-skin side sheet 21 has a shape that becomes narrower inward in the left-right direction at the longitudinal center portion (a portion including the center position CL).

[0068] The skin side sheet 22 is a stretch sheet member laminated on the skin side of the non-skin side sheet 21 on the longitudinal front side (ventral side). The skin side sheet 22 is formed, for example, by a stretch nonwoven fabric sheet. "Stretch nonwoven fabric" is a nonwoven fabric containing stretch fibers having stretchability and elongation fibers having a shrinkage capacity lower than that of the stretch fibers. The stretch nonwoven fabric is made by appropriate stretching treatment such as gear stretching. For the skin side sheet 22 of the present embodiment, a polyurethane elastomer fiber, which is a thermoplastic elastomer having elasticity, can be used as the stretch fiber, and a polypropylene (PP) fiber, which is a polyolefin resin, which is a thermoplastic resin having no elasticity, can be used as the elongation fiber.

[0069] The skin side sheets 22 are joined to the non-skin side sheets 21 by a plurality of sheet joints (not shown) scattered therein, so that the front waistline 20f is endowed with elasticity in at least the left and right directions. In the present embodiment, the sheet joints are all formed by known joining methods (such as ultrasonic welding, etc.).

[0070] The skin side sheet 23 is a stretchable sheet member laminated on the skin side of the non-skin side sheet 21 on the longitudinal rear side (back side). The skin side sheet 23 has the same structure as the skin side sheet 22. That is, the skin side sheet 23 is formed of a stretchable nonwoven fabric sheet and is joined to the non-skin side sheet 21 by a plurality of scattered sheet joints (not shown). Therefore, the rear waist portion 20b is given stretchability in at least the left-right direction.

[0071] It should be noted that as a sheet member constituting the waist member 20, a sheet member other than the non-skin side sheet 21 and the skin side sheets 22 and 23 may be provided. For example, the waist member 20 may have a three-layer structure in which a non-stretchable nonwoven fabric sheet is arranged on the skin side of the stretchable skin side sheets 22 and 23, and the stretchable nonwoven fabric sheet is sandwiched between the non-stretchable nonwoven fabric sheets. In addition, in the case of a three-layer structure, the skin side sheets 22 and 23 may be stretchable films.

[0072] In Figure 2 The diaper 1 in the unfolded state shown is folded in half in the longitudinal direction (front-rear direction) at a folded position, which is a longitudinal center position CL (in the longitudinal direction) so that the skin side surface of the front waist portion 20f and the skin side surface of the rear waist portion 20b face each other. Figure 2 In this folded state, the left and right ends 40f and 40f of the front waist portion 20f overlap with the left and right ends 40b and 40b of the rear waist portion 20b in the front-to-back direction, and these ends are joined using a known joining method (such as sealing welding, etc.) to form a side joint 40. Therefore, in the folded waist member 20 (20f and 20b), the front side (ventral side) and the rear side (dorsal side) are connected in a ring manner, and the pant-type diaper 1 is formed to have Figure 1 Shown is a waist opening 1a and a pair of leg openings 1b.

[0073] (Jointing member 30)

[0074] A pair of tabs 30 (corresponding to engaging members) is provided on both side portions in the left-right direction of the diaper 1. The tabs 30 each include a base sheet 31 and an engaging portion 32.

[0075] The base sheet 31 is a sheet member formed of a nonwoven fabric sheet or the like. The base sheet 31 is joined to the waist member 20 via a tab joint 35 on one side in the left-right direction (corresponding to the base end side), and has a joint 32 (see FIG. Figure 2). In the present embodiment, the side joint portion 40 of the waist member 20 is also used as the tab joint portion 35. That is, the front waist portion 20f, the rear waist portion 20b and the tab 30 are joined as a whole through the side joint portion 40. However, the tab joint portion 35 may be provided separately from the side joint portion 40. For example, in the front waist portion 20f or the rear waist portion 20b, a structure in which the tab 30 is joined to a predetermined area outside the side joint portion 40 through the tab joint portion 35 is acceptable. In addition, the tab joint portion 35 may be formed in the same manner as the side joint portion 40 by ultrasonic welding or the like, or may be formed using an adhesive such as a hot melt adhesive or the like.

[0076] The engaging portion 32 is a locking member for detachably engaging the tab 30 to the waist member 20, and is disposed in a predetermined area on the skin-side surface of the tab 30 (an area on the opposite side (distal side) of the tab engaging portion 35 in the left-right direction). In the present embodiment, the engaging portion 32 is, for example, a hook-and-loop fastener, which is formed of polypropylene and has a plurality of hook members for locking (protrusions for locking, not shown) disposed on its skin-side surface. These protrusions for locking are hooked onto the fibers (rings) of the non-woven fabric sheet constituting the outermost non-skin side sheet 21 disposed on the waist member 20, thereby detachably locking the engaging portion 32 (tab 30) to the non-skin-side surface of the waist member 20. However, a configuration in which the hook member for locking is disposed on the waist member 20 side and the ring member to be hooked by the hook member is disposed on the engaging portion 32 side is also acceptable.

[0077] like Figure 1 As shown, in the underpants-type diaper 1, the engaging portion 32 of the tab 30 is joined to the non-skin side surface of the front waist portion 20f in the area located on the left-right inner side of the tab engaging portion 35 (side engaging portion 40). It should be noted that in the present embodiment, the tab 30 is provided on the non-skin side relative to the waist member 20 (front waist portion 20f), and the engaging portion 32 is provided on the skin side of the tab 30. However, a configuration may be exemplified in which the tab 30 is provided on the skin side relative to the waist member 20, and the engaging portion 32 is provided on the non-skin side of the tab 30.

[0078] <Operation of putting on and taking off the diaper 1>

[0079] Next, the operation of putting on and taking off the diaper 1 will be described. In the initial state, the diaper 1 is in the following state. Figure 1 The underwear type (pants type) state shown in the figure can be put on as common underwear type absorbent article. In addition, when taking off the diaper 1 from the body, the waist member 20 formed into a ring along the wearer's waist can be removed by separating the waist member 20 into a front waist portion 20f and a back waist portion 20b and opening the diaper 1.

[0080] Figure 4A and Figure 4 B is a diagram showing an operation of separating the waist member 20 of the diaper 1 into the front waist portion 20f and the rear waist portion 20b. Figure 4 A is a schematic cross-sectional view showing the diaper 1 in a pant-type state as viewed from above in the vertical direction (from the waist opening 1a side), Figure 4 B is a diagram showing that the front waistline 20f and the back waistline 20b are separated. Figure 4 A is a schematic cross-sectional view of a diaper 1 .

[0081] In the underpants-type diaper 1, the front waist portion 20f and the rear waist portion 20b are joined to each other in the side joining portions 40 and 40 provided in both end portions in the left-right direction, thereby forming a Figure 4 A shows the annular waist opening 1a. In addition, a pair of protrusions 30 are provided on both sides of the waist member 20 in the left-right direction, and the protrusions 30 are joined to the non-skin side surface of the front waist portion 20f via a joining portion 32.

[0082] In addition, Figure 4 In A, a pair of separation parts 25 are provided on both sides of the front waist part 20f in the left-right direction. The separation parts 25 are each used to separate the waist member 20 formed in a ring shape along the waist of the wearer into a portion including at least the central portion of the front waist part 20f and a portion including at least the central portion of the back waist part 20b. The separation part 25 is provided somewhere in the left-right direction area from the side joint part 40 to the portion where the joint part 32 is locked. The separation part 25 is, for example, a perforation extending in the up-down direction (see Figure 2 ), and by tearing the waist member 20 along the perforation, the waist member 20 can be easily separated into a portion including at least the central portion of the front waist portion 20f and a portion including at least the central portion of the rear waist portion 20b.

[0083] It should be noted that in the diaper 1, the side joint 40 is formed by ultrasonic welding, and therefore, the rigidity of the side joint 40 is higher than the rigidity of the remaining area of ​​the waist member 20. Therefore, it is also possible to tear the waist member 20 along the inner end in the left-right direction of the side joint 40 where the rigidity difference of the waist member 20 is large. In this case, since the inner end of the side joint 40 is used as the separation portion 25, it is not necessary to provide a perforation or the like.

[0084] The diaper 1 separated into the portion including at least the middle portion of the front waist portion 20f and the portion including at least the middle portion of the rear waist portion 20b at the separation portion 25 is in a Figure 4 The state shown in B. That is, Figure 4 The separation portion 25 in A is separated into a separation end 25fe on the front waist portion 20f side and a separation end 25be on the back waist portion 20b side. Figure 4In the embodiment of the present invention, a pair of tabs 30 and 30 are joined to the rear waist portion 20b by tab joints 35 (side joints 40) on both sides in the left-right direction, and joints 32 and 32 provided on the tabs 30 and 30 are joined to the front waist portion 20f. Therefore, the waist member 20 is formed into a ring shape. When the diaper 1 in this state is removed from the wearer's body, it can be easily removed by unlocking the joints 32 from the front waist portion 20f and unfolding the diaper 1.

[0085] Figure 5 2 is a developed plan view of the diaper 1 in a state where the waist member 20 is separated along the separation parts 25 located on both sides in the left-right direction. The separated diaper 1 can be used as a so-called belt-type diaper, in which the tabs 30 including the joining parts 32 are provided on both sides in the left-right direction of the rear waist portion 20b. That is, the diaper 1 of this embodiment can be used as a dual-purpose type of underpants diaper and belt-type diaper.

[0086] Conventional pant-type diapers are difficult to put on and take off in places such as toilets where it is difficult for the wearer to take off his or her pants or shoes when going out. However, according to the diaper 1 of the present embodiment, the waist member 20 is separated by the separation portion 25, which makes it easy to take off the diaper 1. In addition, by preliminarily separating the waist member 20 of the new diaper 1 by the separation portion 25 and setting the diaper 1 in the unfolded state, the diaper 1 can be used as a belt-type diaper, which makes it easy to put on and take off the diaper even in an environment where it is difficult for the wearer to take off his or her pants or shoes.

[0087] In such a panty-type diaper, in order to make the diaper look more like underwear, usually, the position where the waist member 20 has the shortest length in the vertical direction is often set at the position of the side joint 40. In addition, in the waist member 20, the portion extending from the vicinity of the lower end of the side joint 40 toward the crotch is the portion to which force is applied due to the friction of the thickest part of the wearer's thigh when the wearer walks in the state of wearing the panty-type diaper, etc. Therefore, in particular, the front waist portion 20f is pulled and stretched in the left and right directions, and the tension is applied to the side joint 40 and hardens the front waist portion 20f, resulting in the risk of discomfort around the thigh. However, if the waist member 20 is made shorter in the vertical direction in the portion from the vicinity of the lower end of the side joint 40 to the crotch in order to reduce friction with the thigh, not only the risk of making the wearer uneasy is increased, but also the risk of tearing the shortened portion is increased.

[0088] In contrast, the diaper 1 of the present embodiment has the following configuration. Figure 61 is an enlarged view of a portion of the diaper 1 in a natural state. Specifically, the figure shows a state in which the packaged product (diaper 1) is taken out and unfolded, and the vicinity of one of the tabs 30 and 30 provided on both sides in the left and right directions as seen from the front side (ventral side). Here, the engaging portion 32 of the tab 30 is in a state of engaging with the front waist portion 20f. Figure 6 As shown, the protrusion 30 in this embodiment includes a protrusion 30T (by Figure 6 More specifically, the lower end 30ebn of the side edge 30eb of the tab 30 on the side joint 40 side (base end side) is located below the lower end 20fen of the side end 20fe of the front waist portion 20f. Therefore, on the front side (ventral side) of the diaper 1 of this embodiment, a part of the lower edge 20feg of the front waist portion 20f and a part of the lower edge 30ge of the tab 30 define a part of the leg opening 1b (see Figure 1 and Figure 6 ).

[0089] Since the tab 30 includes a protrusion 30T that protrudes downward beyond the lower edge 20feg of the front waist portion 20f, the protrusion 30T can be along the wearer's thigh during the use of the diaper, which enables a shorts-like shape. If the lower edge 20feg of the front waist portion 20f contacts the thigh when the wearer walks, the elastic front waist portion 20f will be pulled in the left-right direction and cause discomfort, or the portion in contact with the thigh will be tilted. However, since the tab 30 is only engaged on one side (base end side) in the left-right direction, its tension is lower than the tension of the waist member 20f. Therefore, even if the thigh contacts the protrusion 30T of the tab 30, it is not easy to cause discomfort. In addition, even if the upper and lower lengths of the front waist portion 20f located on the skin side relative to the tab 30 are made shorter, the protrusion 30T of the tab 30 can also give the wearer a sense of security. In addition, covering such a short portion with the tab 30 can make the front waist portion 20f not easy to tear.

[0090] Furthermore, in the present embodiment, the front waist portion 20f, the rear waist portion 20b, and the tab 30 are joined as one body by the side joint portion 40. In addition, the tab 30T protrudes downward beyond the lower edge 20feg of the front waist portion 20f, and therefore, in each side joint portion 40, the side end portion 30Ta of the base end side (side of the side joint portion 40) of the tab 30T is joined to the rear waist portion 20b. Therefore, during the use of the diaper, even in the case where the tab 30T of the tab 30 is in contact with the thigh, a portion of the tab 30T can be firmly pressed, and this makes it difficult for the tab 30T to be lifted up. Furthermore, the side joint portion 40 has high rigidity, and therefore, providing a portion of the tab 30T in such a side joint portion 40 makes it difficult for the tab 30T to be lifted up. In addition, for example, when the side end fe of the front waist portion 20f is made shorter in the vertical direction without providing the joining member 30, the area of ​​the portion covering the buttocks becomes smaller, and therefore, the hem of the rear waist portion 20b may slide up due to the movement of the wearer. However, by joining the side edge (side end) 30eb of the base end side of the protrusion 30T to the side end of the rear waist portion 20b as in the present embodiment, even when the side end fe of the front waist portion 20f is made shorter in the vertical direction, it is possible to ensure that the portion of the rear waist portion 20b covering the buttocks is large enough to correspond to the length joined to the protrusion 30T. This makes it possible to suppress the hem of the rear waist portion 20b from sliding up.

[0091] In addition, if Figure 6 As shown, the upper edge 20fug of the front waist portion 20f defines a portion of the waist opening 1a. In a state where the engaging portion 32 is engaged with the front waist portion 20f, the upper edge 30gu of the tab 30 is located below the upper edge 20fug of the front waist portion 20f. In the case where a portion of the tab 30 protrudes beyond the edge (upper edge 20fug) of the waist opening 1a, there is a risk that such a protrusion contacts the abdomen of the wearer and causes discomfort. However, the tab 30 is arranged on the non-skin surface side of the front waist portion 20f and below the upper edge 20fug so that the generation of such discomfort can be suppressed.

[0092] In addition, Figure 6 In the state before putting on the diaper shown, the tab 30 is arranged so as to cover at least a part of the separation portion 25, and the upper end 25up of the separation portion 25 is located above the position of the upper end 30up of the tab 30. As described above, the separation portion 25 can be visually recognized before putting on the diaper 1, which makes it easier for the wearer to determine at which position to tear the front waist portion 20f. This makes it easier to smoothly perform the tearing operation along the separation portion 25.

[0093] In addition, if Figure 6As shown, in the left-right direction, at least a portion of the engaging portion 32 of the tab 30 is located inside the inner end 30Tin of the protrusion 30T. The end of the distal end side (the side where the engaging portion 32 is provided) of the tab 30 is a so-called free end. Therefore, if the protrusion 30T is provided to extend until the inner side of the engaging portion 32 in the left-right direction, there is a risk that the protrusion 30T is easily lifted when the force of the wearer's leg is applied to the protrusion 30T. By configuring at least a portion of the engaging portion 32 to be arranged inside the inner end 30Tin of the protrusion 30T in the left-right direction, it is possible to prevent the protrusion 30T from easily lifting.

[0094] Furthermore, in the diaper 1 of the present embodiment, it is preferred that the color of the non-skin side surface of the (entire) front waist portion 20f and the color of the non-skin side surface of the (entire) tab 30 are similar to each other. For example, in a care diaper different from the diaper 1 of the present embodiment, in many cases, a blue or green joining portion is provided on a white tab, the color of the joining portion is visually recognized through perspective from the outside of the diaper, and the color of the non-skin side surface is different between the front waist portion and the tab. Therefore, as in the diaper 1 of the present embodiment, the non-skin side surface of the front waist portion and the tab are made to have colors similar to each other, making the diaper appearance inconspicuous and improving the appearance of the diaper 1.

[0095] However, in the above case, it is difficult for the wearer to recognize the position of the engaging portion 32 from the non-skin surface side of the diaper 1. Therefore, it is preferable that each tab 30 includes a plurality of compressed portions CP (see FIG. 1 ) that compress the tab 30 in the thickness direction in the region where the engaging portion 32 is arranged. Figure 6 ). By doing so, the position of the engaging portion 32 is easily identified from the non-skin surface side of the tab 30, making it easier to engage the tab 30 with the front waist portion 20f and enhancing the ease of wearing of the diaper 1. It should be noted that the compression portion CP may be compressed from the skin side of the tab 30 or from the non-skin side. In either case, the compression portion CP can be visually identified from the outside (non-skin side) of the tab 30.

[0096] Furthermore, in many cases, each engaging portion 32 is joined to the base sheet 31 constituting the tab 30 only with an adhesive, but the joining strength between the tab 30 and the engaging portion 32 is further increased due to the compression portion CP. Therefore, the tab 30 can be reattached without the engaging portion 32 being separated from the tab 30. Furthermore, this makes it possible to prevent the tab 30 from being detached during use of the diaper 1.

[0097] It should be noted that similar colors mean that, in the Munsell color system (100 hue), their hue difference is less than 5, their lightness difference is less than 1, or their chroma difference is less than 1. And the meaning of similar colors includes the case where the colors are the same.

[0098] It is preferred that the color difference ΔE is less than 1. The color difference is measured as follows.

[0099] (1) X-Rite eXact Standard (measurement diameter: 1.5 mm) manufactured by X-Rite Corporation was prepared.

[0100] (2) The CIE L*a*b* coordinates of the portion to be measured of the sample (non-skin side surface of the front waistline portion 20f) are measured at ten or more different positions, and the average values ​​(L1*, a1*, and b1*) thereof are calculated.

[0101] (3) The CIE L*a*b* coordinates of the portion to be compared (non-skin side surface of the tab 30 ) of the sample are measured at ten or more different positions, and the average values ​​thereof (L2*, a2*, and b2*) are calculated.

[0102] (4) Calculate the color difference ΔE from the above results (ΔE = [(L1*-L2*) 2 +(a1*-a2*) 2 +(b1*-b2*) 2 ] 1 / 2 ).

[0103] Figure 7 yes Figure 6 A simplified view of the lower portion of the tab 30 is shown in FIG. Figure 7 In order to facilitate understanding of the shape of the tab 30, the structure of the side joint 40 (tab joint 35) and the like is omitted. Figure 7 As shown, at least a portion of the lower edge 30ge of the tab 30 has a curved portion 30y. Specifically, when the engaging portion 32 of the tab 30 is engaged with the waist portion 20f, Figure 7 The curved portion 30y shown extends from the left-right outer side toward the left-right inner side and toward the upper side in the vertical direction. By making the curved portion 30y of the lower edge 30ge of the tab 30 extend toward the left-right inner side and toward the upper side in the vertical direction, when the wearer engages the tab 30 with the front waist portion 20f while pulling the tab 30 toward the left-right inner side, the force for pulling the tab 30 is easily transmitted to the same direction (toward the left-right inner side and upward). Therefore, it is easier to pull up in the same direction. In addition, by providing the curved portion 30y, the outer shape of the diaper 1 can be made to look neat.

[0104] In addition, in the present embodiment, the lower edge 30ge of the protrusion 30 further includes another curved portion on the left-right inner side of the curved portion 30y. Specifically, the lower edge 30ge has an inflection point Q at which the curve changes from an upward convex ( Figure 7The curved portion 30y) becomes convex downward. The inflection point Q is located above the lower end (lower edge) 20feg of the front waistline portion 20f. The curve extending from the inflection point Q toward the inner side in the left-right direction is convex downward. Therefore, when the inflection point Q is located below the lower end (lower edge) 20feg of the front waistline portion 20f, there is a risk that the inflection point Q portion and the inner side portion of the inflection point Q in the left-right direction will contact the wearer's thigh and cause discomfort. However, the inflection point Q is located above the lower end (lower edge) 20feg, which makes it possible to prevent the occurrence of such discomfort.

[0105] In addition, if Figure 7 As shown, in the peripheral portion, the tab 30 of the present embodiment includes a plurality of compressed portions CP that compress the tab 30 in the thickness direction. Figure 6 In order to facilitate the description of the structure of the protrusion 30, the compression portion CP in the peripheral portion is omitted. Here, preferably, the peripheral portion refers to a portion having a width of approximately 3 mm from the peripheral edge of the protrusion 30 inward. In this embodiment, as Figure 7 As shown in FIG. 1 , the compression portion CP is formed in a dot shape along the outline of the tab 30, but may be formed in a line shape or may be formed only in the protruding portion 30T. By providing a plurality of compression portions CP in the peripheral portion, the rigidity of the tab 30 is increased, and the tab 30 is made easier to grasp. In addition, since the protruding portion 30T includes a plurality of compression portions CP, the rigidity of the protruding portion 30T is also increased, making it possible to further prevent the protruding portion 30T from rising during use of the diaper.

[0106] Figure 8 1 is a schematic plan view of the diaper 1 viewed from the skin side, and the diaper 1 is in an unfolded and stretched state by unfolding the tab 30 which is already in a product state toward the left and right sides. Figure 8 As shown, about the central position CB of the left and right direction center of the left and right direction side end 40E of the left and right direction side end 10ea of ​​the absorbent body 10 to the waist member 20 (front waist 20f, rear waist 20b), the longitudinal length of the waist member 20 (front waist 20f, rear waist 20b) at the side end 10ea side of the absorbent body 10 relative to the central position CB is longer than the longitudinal length (Lf and Lb) of the waist member 20 (front waist 20f, rear waist 20b) at the left and right direction central position CB. That is, compared with the length (Lf and Lb) at the central position CB, the length becomes longer toward the crotch side. Therefore, by providing a structure in which the area covered by the waist member 20 increases toward the crotch side and the area covering the legs decreases toward both sides of the left and right directions, the wearer is more likely to move the thigh during the use of the diaper, so that discomfort can be alleviated. Furthermore, making the longitudinal length of the waist member 20 on the absorbent body 10 side (crotch side) longer makes it possible to prevent the groin from being exposed and to alleviate anxiety about leakage.

[0107] In addition, in the protruding portion 30T of the protruding piece 30, the vertical length of the protruding portion 30T is longest at the side end portion 30e of the protruding piece 30 on the side joint portion 40 side (base end side), and the vertical length becomes shorter as it goes to the inside in the left-right direction (see Figure 6 ).like Figure 8 As shown, the length of the waist member 20 in the vertical direction becomes longer as it goes toward the center of the left and right directions (inward), that is, the length (width) increases toward the side where the wearer's thigh tapers (toe side). On the contrary, it is preferred that the protrusion amount of the protrusion 30T protruding toward the inner side of the left and right directions becomes smaller (that is, it is preferred that the longitudinal length becomes shorter). This makes it easier for the protrusion 30T to be along the thigh. In addition, this makes it possible to make it into a panty-like shape while making the appearance look neat.

[0108] In addition, return Figure 2 The front leg elastic member 28 is provided in the front waist portion 20f along the lower edge portion in the vertical direction (i.e., the outline of the leg opening 1b). The front leg elastic member 28 is an elastic member such as an elastic thread, and is arranged between the non-skin side sheet 21 and the skin side sheet 22 in the thickness direction in a state of extending from one side in the left-right direction to the other side in the left-right direction (see Figure 2 , Figure 3 In the same manner, the rear leg elastic member 29 extending along the edge portion of the lower side in the vertical direction (i.e., the outline of the leg opening 1b) is provided in the rear waist portion 20b. The rear leg elastic member 29 is an elastic member such as an elastic thread, and is arranged between the non-skin side sheet 21 and the skin side sheet 23 in the thickness direction in a state of extending from one side in the left-right direction to the other side in the left-right direction (see Figure 2 , Figure 3 wait).

[0109] In addition, in order to make the front leg elastic member 28 and the rear leg elastic member 29 follow the contour of the leg opening 1b, it is desirable that the front leg elastic member 28 and the rear leg elastic member 29 include curved portions 28cv, 28cv, 29cv, 29cv (28cv) that curve upward from the left-right inner side toward the left-right outer side as in the present embodiment. Figure 2 ).

[0110] By providing these leg elastic members 28 and 29, elasticity is imparted along the leg opening 1b of the diaper 1, and the leg opening 1b is easily fitted around the legs of the wearer. In particular, in the back waist portion 20b, the leg opening 1b is easily lifted and separated from the wearer's body (buttocks) or displaced due to the protrusion of the wearer's buttocks or the influence of the movement of the wearer's legs. Therefore, by providing the back leg elastic member 29 that is elastic along the leg opening 1b, the fit of the back waist portion 20b around the legs on the wearer's buttocks side is improved, and the wearer is not easily uncomfortable or uncomfortable. In addition, the side joints 40 all have a portion that overlaps with the back leg elastic member 29 in the thickness direction, that is, when viewed in the thickness direction, each side joint 40 intersects with the back leg elastic member 29, and therefore, due to the elastic force of the curved portion 29cv of the back leg elastic member 29, the side joint 40 is pulled outward and obliquely upward in the left and right directions to conform to the shape of the wearer's buttocks. Therefore, this makes it less likely that a gap will be generated between the joining portion and the crotch of the wearer, making it possible to suppress leakage of excrement.

[0111] Furthermore, when the waist member 20 is separated along a pair of separation portions 25 provided in the front waist portion 20f, and then an operation of engaging the tab 30 with the non-skin side surface of the front waist portion 20f is performed, the following effect can be obtained on such rear leg elastic member 29. First, before putting on the diaper, when the front waist portion 20f is cut along the separation portion 25 and the waist member 20 is separated into a portion including at least the central portion of the front waist portion 20f and a portion including at least the central portion of the rear waist portion 20b, the tab 30 is located on both sides of the rear waist portion 20b in the left-right direction, as shown in FIG. Figure 5 Then, as Figure 5 As shown, when the diaper 1 is in the unfolded and stretched state, in the state where the tab 30 is unfolded in the left-right direction, the curved portion 30y included in the lower edge 30ge of the tab 30 extends from the left-right inner side toward the left-right outer side and toward the upper side. That is, the direction in which the curve of the curved portion 30y extends is the same as the bending direction of the curved portion 29cv of the rear leg elastic member 29 (from the left-right inner side toward the left-right outer side and toward the upper side). As described above, the bending direction of the curved portion 29cv of the rear leg elastic member 29 and the extending direction of the curved portion 30y of the tab 30 are the same, so when the tab 30 is pulled and engaged with the front waist portion 20f after separation, the force of pulling the tab 30 is easily linked to the rear leg elastic member 29. Pulling the tab 30 makes it easier to transmit the force for adjusting the waist position to the rear leg elastic member 29, and this makes it possible to configure the rear waist portion 20b in an appropriate position, so that the fit can be enhanced.

[0112] It should be noted that the curved portions 28cv, 28cv of the front leg elastic member 28 and the curved portions 29cv, 29cv of the rear leg elastic member 29 of the present embodiment have a shape that curves from the left-right inner side toward the left-right outer side and toward the upper side, but the configuration is not limited thereto, and for example, a configuration in which the curved portions have a straight shape extending in the same direction may be accepted. That is, for example, the rear leg elastic member 29 may extend in a manner along the rear leg circumference of the wearer.

[0113] Fig. 9 1 is a plan view showing a state in which the diaper 1 in the tape-type state is made into the underpants-type state again and stretched. Fig. 9 Shows Figure 5 The diaper 1 shown in the unfolded and stretched state is folded in half at the longitudinal center position CL, and a pair of engagement portions 32 and 32 are locked to the front waist portion 20f, thereby forming the diaper 1 into a panty-type state. In such a stretched panty-type state, the diaper 1 includes an intersection point P where the lower edge 30ge of the tab 30 and the lower edge 20feg of the front waist portion 20f intersect. The lower edge 30ge of the tab 30 draws a curve extending from the intersection point P toward the left-right direction outer side and toward the lower side in the up-down direction, and the lower edge 20feg of the front waist portion 20f draws a curve extending from the intersection point P toward the left-right direction inner side and toward the lower side in the up-down direction. When comparing the curves of the lower edges (30ge and 20feg), the maximum value of the curvature of the curve along the lower edge 30ge of the tab 30 is greater than the maximum value of the curvature of the curve along the lower edge 20feg of the front waist portion 20f. The curvature of the curve described here indicates the local curvature degree of the curve, and means that the larger the curvature, the larger the curvature degree (the sharper the bend), and the smaller the curvature, the smaller the curvature degree (the gentler the bend). In addition, the curve drawn by the lower edges 30ge and 20feg does not have a constant curvature, so the maximum value thereof, that is, the position where the curvature degree is the largest, is compared. In the present embodiment, since the maximum value of the curvature of the curve of the lower edge 30ge of the tab 30 is large (that is, the bend of the lower edge 30ge of the tab 30 is sharp), the diaper can have an appearance closer to underwear during the use of the diaper. In addition, in the case of the above-mentioned construction, when the diaper is put on, even in the case where the tab 30 is joined more inward in the left-right direction, that is, even in the case where the tab 30 is joined in a manner that fits around a thin waist, it is easy to ensure the protrusion 30T relative to the lower edge 20feg of the front waist portion 20f having a smaller curvature (the bend is gentle).

[0114] ===Other Implementation Methods===

[0115] The above embodiments have been described to facilitate understanding of the present invention, rather than to interpret the present invention in a limiting manner. The present invention may be modified or improved in various ways without departing from the gist of the present invention, and the present invention includes its equivalents.

[0116] In the above embodiment, by using stretchable sheets (e.g., stretchable nonwoven fabric) as the skin side sheets 22 and 23 constituting the waist member 20, stretchability in the left-right direction is imparted to the waist member 20. However, other stretchable members may be provided in the waist member 20. For example, Figure 2 As shown, it is acceptable to set a waist elastic member 27 such as an elastic thread in the upper end of the front waist portion 20f and the rear waist portion 20b so as to be able to stretch in the left and right directions. By setting the waist elastic member 27, the fit of the waist opening 1a is further improved, and this makes it possible to suppress the position displacement of the waist member 20 during the use of the diaper 1.

[0117] In the above-mentioned embodiment, the tabs 30 are arranged on both sides of the waist member 20 in the left-right direction, but they can also be arranged on only one side. In addition, for example, such a structure can be adopted: by pulling the tabs 30 arranged only on one side during use, the inner end of the side joint 40 in the left-right direction with a large difference in rigidity in the front waist portion 20f can be easily torn. Therefore, a panty-type diaper that can be unfolded only on one side during use is realized. In this case, since the inner end of the side joint 40 in the left-right direction plays the role of the separation portion 25 of this embodiment, it is not necessary to set perforations, etc.

[0118] Description of Reference Numerals

[0119] 1: Diapers (underwear absorbent articles),

[0120] 1a: waist opening, 1b: leg opening,

[0121] 10: Absorbent body,

[0122] 11: absorbent core,

[0123] 12: Frontal film,

[0124] 13: back sheet, 13a: liquid impermeable sheet, 13b: hydrophobic sheet,

[0125] 20: Waist component,

[0126] 20f: front waist, 20fe: side, 20fen: bottom,

[0127] 20b: lower back,

[0128] 20feg: lower edge,

[0129] 21: non-skin side piece, 22: skin side piece, 23: skin side piece,

[0130] 25: separation part, 25fe: separation end, 25be: separation end,

[0131] 27: Elastic waist component,

[0132] 28: front leg elastic member, 28cv: curved part,

[0133] 29: rear leg elastic member, 29cv: curved part,

[0134] 30: tab (engagement member), 30e: side end, 30eb: side edge,

[0135] 30ebn: lower end,

[0136] 30ge: lower edge, 30gu: upper edge,

[0137] 30y: curved part, 30T: protruding part,

[0138] 31: base sheet, 32: joint portion, 35: tab joint portion,

[0139] 40: side joint, 40f: end, 40b: end,

[0140] 50: absorbent elastic member,

[0141] CL: Central position, CP: Compression part,

[0142] P: intersection point, Q: inflection point.

Claims

1. A pant-type absorbent article having an up-down direction, a left-right direction, and a front-back direction intersecting each other, The panty-type absorbent article comprises: Absorbent body; a waist member arranged to be stacked on the absorbent body in the front-rear direction and including a front waist portion and a rear waist portion; as well as a joining member in which a base end side is joined to the waist member and a joining portion is provided on a distal end side, The front waist portion and the rear waist portion are joined to each other, In a state where the joint portion is joined to the front waist portion, The lower end of the side edge of the base end side of the joining member is located below the lower end of the side end of the front waist portion, A portion of the lower edge of the front waist portion and a portion of the lower edge of the engaging member define a portion of the leg opening.

2. The underpants-type absorbent article according to claim 1, characterized in that: In the engaged state, The engaging member includes a protruding portion that protrudes downward in the up-down direction beyond the lower edge of the front waist portion, and The side end portion of the proximal end side of the protruding portion is joined to the rear waist portion.

3. The underpants-type absorbent article according to claim 1 or 2, characterized in that: The joining member is arranged on the non-skin side of the front waist portion, and In the engaged state, The upper edge of the front waist portion defines a portion of the waist opening, and An upper edge of the engaging member is located below an upper edge of the front waist portion.

4. The underpants-type absorbent article according to claim 1, characterized in that: In a state where the underpants-type absorbent article is stretched and unfolded by opening the engaging member toward the outside in the left-right direction, The pant-type absorbent article has a longitudinal direction and a left-right direction, and With respect to the central position in the left-right direction between the side end of one side in the left-right direction of the absorbent body and the side end of one side in the left-right direction of the waist member, the longitudinal length of the waist member on the side end of one side of the absorbent body relative to the central position is longer than the longitudinal length of the waist member at the central position.

5. The underpants-type absorbent article according to claim 4, characterized in that: In the engaged state, The engaging member includes a protruding portion that protrudes downward in the up-down direction beyond the lower edge of the front waist portion, and The length of the protruding portion in the up-down direction is longest at the side end portion on the base end side of the engaging member.

6. The underpants-type absorbent article according to claim 1, characterized in that: In a state before putting on the underwear type absorbent article, A pair of separation parts are provided on both sides of the front waist part in the left-right direction, each of the pair of separation parts is used to separate the waist member into a portion of the front waist part including at least a central portion and a portion of the rear waist part including at least a central portion, The joining member is arranged on the non-skin side of the front waist portion and covers at least a portion of the separation portion, and The upper end of the separation portion is located above the upper end of the engagement member.

7. The underpants-type absorbent article according to claim 6, characterized in that: At least a portion of the lower edge of the engagement member has a curved portion, and In the engaged state, The curved portion extends from the outer side in the left-right direction toward the inner side in the left-right direction and toward the upper side in the up-down direction.

8. The underpants-type absorbent article according to claim 6 or 7, characterized in that: The rear waist portion includes a rear leg elastic member extending along the lower edge portion in the up-down direction, the rear leg elastic member extending from the inner side in the left-right direction toward the outer side in the left-right direction and upward along the rear side of the leg circumference, In a state where the waist member is separated along the separation portion into a portion of the front waist portion including at least a central portion and a portion of the rear waist portion including at least a central portion, the joining members are located on both sides of the rear waist portion in the left-right direction, and In a state where the engaging members are deployed in the left-right direction, a bent portion included in the lower edge of each of the engaging members extends from the inner side in the left-right direction toward the outer side in the left-right direction and upward.

9. The underpants-type absorbent article according to claim 1, wherein: The joining member is arranged on the non-skin side of the front waist portion, At least a portion of the lower edge of the engagement member has a curved portion, In the engaged state, The lower edge of the engagement member has an inflection point at which the curve changes from being upwardly convex to being downwardly convex, and The inflection point is located above the lower end of the front waistline portion.

10. The underpants-type absorbent article according to claim 1, wherein: providing an intersection point in a state where the engaging members are engaged after being extended, The intersection point is a point where the lower edge of the joining member and the lower edge of the front waist portion intersect, and The maximum value of the curvature of the curve extending from the intersection point toward the outside in the left-right direction and toward the bottom in the up-down direction and along the lower edge of the joining member Greater than The maximum value of the curvature of the curved line extending from the intersection point inward in the left-right direction and downward in the up-down direction and along the lower edge of the front waistline portion.

11. The underpants-type absorbent article according to claim 1, wherein: In the engaged state, The engaging member includes a protruding portion that protrudes downward in the up-down direction beyond the lower edge of the front waist portion, and At least a portion of the engagement portion of the engagement member is located inside an inner end of the protruding portion in the left-right direction.

12. The underpants-type absorbent article according to claim 1, wherein: The joining member is arranged on the non-skin side of the front waist portion, In the engaged state, The engaging member includes a protruding portion that protrudes downward in the up-down direction beyond the lower edge of the front waist portion, and The protrusion includes a plurality of compression portions.

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