Pants-type absorbent article

Abstract

To provide an absorbent article hardly generating turn-up and discomfort feeling around the thigh of a wearer at wearing.SOLUTION: An underpants type absorbent article (1) includes: an absorbent body (10); a waist member (20) having a front waist part (20f) and a rear waist part (20b); and engaging members (30) connected to the waist member (20) at the base end side, and each having an engaging part (32) at a tip side. The front waist part (20f) and the rear waist part (20b) are connected. In a state that the engaging part (32) is engaged with the front waist part (20f), a lower end (30ebn) of a side edge (30eb) at a base end side of the engaging member (30) is positioned below a lower end (20fen) of a side edge (20fe) of the front waist part (20f), and a part of a lower side edge (20feg) of the front waist part (20f), and a part of a lower side edge (30ge) of the engaging member (30) partition a part of a leg opening part (1b).SELECTED DRAWING: Figure 6

Description

[Technical field]

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

[0002] Conventionally, in absorbent articles such as pants-type (shorts-type) disposable diapers, the front waistband and the rear waistband are joined by joints formed at both lateral ends, but in order to reduce discomfort when walking, the waistband is often designed to have a shape similar to that of shorts by making the vertical length of the waistband member the shortest at the joint. For example, Patent Document 1 discloses an absorbent article that can be worn by engaging and attaching engaging members provided on the waistband on the ventral and posterior sides of the absorbent pad to engaging members provided on the waistband on the ventral and posterior sides. Patent Document 2 discloses an absorbent article in which the part of the leg opening that is most inserted into the waistband opening side is not at the position of the joints formed at both lateral ends of the waistband, but is located near the absorber in the lateral direction. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2012-29814 A [Patent Document 2] Republished Patent No. WO2008 / 066008 Summary of the Invention [Problem to be solved by the invention]

[0004] When an absorbent product having the configurations described in Patent Documents 1 and 2 is worn while walking or the like, the lower edge of the front waistband from the lower end of the joint that joins the front and rear waistband members toward the crotch (i.e., the front leg opening) is the part that is rubbed against the thickest part of the wearer's thighs and subjected to force. As a result, the front waistband is pulled and stretched in the left and right directions, and the waistband member is stretched by the force applied to the joint, which may cause discomfort around the thighs. However, if the vertical length of the waistband member is shortened to reduce rubbing against the thighs, it may easily cause the wearer to feel uneasy and may also be easily torn.

[0005] Furthermore, when the part that penetrates most into the waist opening is set at a position other than the position of the above-mentioned joint, as in the absorbent article of Patent Document 2, if an attempt is made to solve this problem during manufacturing by only cutting the shape of the cut, that is, by making the part that penetrates most narrow vertically and widening it vertically from there toward the joint, there is a risk that the widened part near the joint will be easily curled up in the direction perpendicular to the line because it is difficult to apply line tension.

[0006] The present invention has been made in consideration of the above-mentioned problems, and its object is to provide a pants-type absorbent article that is less likely to turn up or cause discomfort around the wearer's thighs when worn. [Means for solving the problem]

[0007] The main invention to achieve the above object is: The vertical direction, the horizontal direction, and the front-rear direction intersect with each other, An absorbent body; A waistline member including a front waistline portion and a rear waistline portion, the front waistline portion and the rear waistline portion being overlapped with the absorbent body in the front-rear direction; An engaging member having a base end side joined to the waistband member and an engaging portion on a tip end side, A pants-type absorbent article in which the front waistband and the rear waistband are joined, In a state where the engagement portion is engaged with the front waist portion, The lower end of the side edge of the base end side of the engaging member is located lower than the lower end of the side edge of the front waistline portion, and a part of the lower edge of the front waistline portion and a part of the lower edge of the engaging member cover a part of the leg opening. Compartmentalized, After being extended, in a state where the engaging member is engaged, an intersection point where the lower edge of the engagement member and the lower edge of the front waistband portion intersect; The maximum value of the curvature of the curve along the lower edge of the engaging member extending from the intersection point to the outside in the left-right direction and to the lower side 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 to the inside in the left-right direction and to the lower side in the up-down direction. The present invention is a pants-type absorbent article characterized by the above. Other features of the present invention will become apparent from the following detailed description of the present invention and the accompanying drawings. Effect of the Invention

[0008] According to the present invention, it is possible to provide a pants-type absorbent article which is less likely to cause turning up or discomfort around the thighs of the wearer when worn. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic perspective view of a napkin 1 according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a plan view of the napkin 1 in an unfolded and extended state, as viewed from the skin side in the thickness direction. [Diagram 3] FIG. 3 is a schematic cross-sectional view of the line AA in FIG. 2. [Figure 4] 4A and 4B are diagrams illustrating the operation of separating the waistline member 20 of the napkin 1 into the front waistline portion 20f and the rear waistline portion 20b. [Diagram 5] FIG. 2 is a developed plan view of the napkin 1 in a state where the waistline member 20 is separated along separation portions 25 on both left and right sides. [Figure 6] FIG. 2 is an enlarged view of a portion of the napkin 1 in its natural state. [Figure 7] 7 is a simplified diagram of the lower portion of the tab 30 shown in FIG. 6. [Figure 8] FIG. 2 is a schematic plan view of the napkin 1 in an unfolded and extended state, as viewed from the skin side, with the tab 30 in the product state opened outward in the left-right direction. [Figure 9]FIG. 1 is a plan view showing the state in which the napkin 1 in the tape-shaped state has been reshaped into pants and stretched. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] At least the following points will become apparent from the description of this specification and the accompanying drawings. This pants-type absorbent article has an absorbent main body having a top-bottom direction, a left-right direction, and a front-to-back direction that intersect with each other, a waist member having a front waist portion and a rear waist portion arranged overlapping the absorbent main body in the front-to-back direction, and an engaging member whose base end side is joined to the waist member and has an engaging portion on its tip side, and is characterized in that when the engaging portion is engaged with the front waist portion, the lower end of the side edge of the base end side of the engaging member is located lower than 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 engaging member define a portion of the leg openings.

[0011] According to such a pants-type absorbent article, a part of the lower edge of the engaging member defines a part of the leg opening, so that the part of the engaging member that protrudes below the lower end of the side end of the front waistline portion is easily fitted to the thigh. Normally, when the lower edge of the front waistline portion touches the thigh during walking, the front waistline portion is pulled in the left-right direction, which tends to cause the front waistline portion to turn up or feel uncomfortable. However, the part of the engaging member that protrudes below the lower end of the front waistline portion is joined to the waistline member at the base end and is a free end that is not joined to the waistline member at the tip end, so that the tension is lower than that of the waistline member. Therefore, even if the thigh touches such a protruding part, it is less likely to cause discomfort. In addition, the presence of the engaging member can give the wearer a sense of security even if the vertical length of the front waistline portion is shortened, and further, the front waistline portion can be made less likely to tear.

[0012] In such a pants-type absorbent article, in the engaged state, it is desirable that the engaging member has a protrusion that protrudes downward in the vertical direction further than the lower edge of the front waistline portion, and that the side end portion on the base end side of the protrusion is joined to the rear waistline portion.

[0013] According to such a pants-type absorbent article, even if the protruding portion of the engaging member hits the thigh when worn, one side end (the side end on the base end side) of the protruding portion is joined to the rear waistband portion, so that it can be firmly held down and is unlikely to turn up. In addition, because the joined portion has high rigidity, it is possible to prevent the article from turning up even if a protruding portion is provided at the joint.

[0014] In such a pants-type absorbent article, it is desirable that the engaging member is positioned 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 the upper edge of the engaging member is positioned lower than the upper edge of the front waist portion.

[0015] With such a pants-type absorbent article, if the engaging member protruded from the edge of the waist opening, there is a risk that the protruding part would come into contact with the skin and cause an uncomfortable feeling; however, by positioning the engaging member on the non-skin-facing side of the front waist portion and below the upper edge, such an uncomfortable feeling can be prevented.

[0016] In such a pants-type absorbent article, when the engaging members are opened outward in the left-right direction and the pants-type absorbent article is stretched and unfolded, it is desirable that the article has a longitudinal direction and a left-right direction, and that the longitudinal length of the waistline member at the side end side of the absorbent body is longer than the longitudinal length of the waistline member at a central position in the left-right direction between one side end of the absorbent body in the left-right direction and one side end of the waistline member in the left-right direction.

[0017] Such pants-type absorbent articles allow the wearer to move the thighs more easily when wearing them, reducing the sense of discomfort. In addition, by making the absorbent body longer, the groin area is prevented from being exposed, reducing the risk of leakage.

[0018] In such a pants-type absorbent article, in the engaged state, it is desirable that the engaging member has a protrusion that protrudes downward in the vertical direction further than the lower edge of the front waistband portion, and that the vertical length of the protrusion is longest at the side end portion on the base end side of the engaging member.

[0019] In such pants-type absorbent articles, since the length of the waistband member in the vertical direction increases toward the center (inner side) in the left-right direction, that is, toward the wearer's thighs that gradually become thinner, it is preferable that the protruding portions decrease toward the inner side in the left-right direction. This makes it easier for the protruding portions to fit the thighs. In addition, such a configuration of the protruding portions can make the outer shape look beautiful.

[0020] In such a pants-type absorbent article, before being worn, a pair of separation portions are provided on both sides of the front waist portion in the left-right direction for separating the waist member into a portion including at least the central portion of the front waist portion and a portion including at least the central portion of the rear waist portion, and it is desirable that the engaging member is positioned on the non-skin side of the front waist portion and so as to cover at least a portion of the separation portion, and that the upper end of the separation portion is located above the upper end of the engaging member.

[0021] According to such a pants-type absorbent article, the wearer can easily determine at what position the front waist portion should be torn by visually checking the separation portion before putting the article on.

[0022] In such a pants-type absorbent article, it is desirable that at least a portion of the lower edge of the engaging member has a curved portion, and that when engaged, the curved portion extends from the outside in the left-right direction to the inside in the left-right direction and upward in the up-down direction.

[0023] According to such a pants-type absorbent article, when the engaging member is engaged with the front waist portion while being pulled inward in the left-right direction, the curved portion of the lower edge of the engaging member extends inward and upward in the left-right direction, so that the force pulling the engaging member is easily transmitted in the same direction (inward and upward in the left-right direction). This makes it easier to pull up in the same direction. Furthermore, the curved shape makes the outer shape of the pants-type absorbent article look neat.

[0024] In such a pants-type absorbent article, it is desirable that the rear waistline portion has a rear leg elastic member along its lower edge in the up-down direction, the rear leg elastic member extending from the inside in the left-right direction to the outside and upper side in the left-right direction along the rear leg, and when the waistline member is separated along the separation portion into a portion including at least the central portion of the front waistline portion and a portion including at least the central portion of the rear waistline portion, the engaging members are located on both sides of the rear waistline portion in the left-right direction, and when the engaging members are spread out in the left-right direction, the curved portions of the lower edges of the engaging members extend from the inside in the left-right direction to the outside and upper side in the left-right direction.

[0025] In such a pants-type absorbent article, after separation, the engaging member is pulled to engage with the front waistline portion, but since the extending direction of the rear leg elastic members is the same as the extending direction of the curved portion of the engaging member, the force pulling the engaging member is easily transmitted to the rear leg elastic members, thereby improving the fit.

[0026] In such a pants-type absorbent article, it is desirable that the engaging member is positioned on the non-skin side of the front waistband, at least a portion of the lower edge of the engaging member has a curved portion, and in the engaged state, the lower edge of the engaging member has an inflection point where the curved portion changes from being convex upward to being convex downward, and that the inflection point is located above the lower end of the front waistband.

[0027] In such a pants-type absorbent article, if the inflection point is located below the lower end of the front waistband, the inflection point of the engaging member may come into contact with the thighs, causing discomfort. However, by locating the inflection point above the lower end of the front waistband, it is possible to prevent such discomfort.

[0028] It is desirable that such a pants-type absorbent article, when stretched and in a state in which the engaging member is engaged, has an intersection where the lower edge of the engaging member intersects with the lower edge of the front waistline portion, and that the maximum value of the curvature of the curve along the lower edge of the engaging member extending from the intersection point outward in the left-right direction and downward 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 inward in the left-right direction and downward in the up-down direction.

[0029] Such a pants-type absorbent article can have an appearance similar to that of shorts. Also, even if the engaging members are engaged more inwardly in the left-right direction, it is easy to ensure that the engaging members protrude from the front waistband portion, which has a small curvature (i.e., a gentle curve).

[0030] In such a pants-type absorbent article, in the engaged state, it is desirable that the engaging member has a protrusion that protrudes downward in the up-down direction further than the lower edge of the front waistband portion, and that at least a part of the engaging portion of the engaging member is located more inward than the inner end of the protrusion in the left-right direction.

[0031] In such a pants-type absorbent article, the tip side of the engaging member (the side where the engaging portion is provided) is a so-called free end, and if the protruding portion is provided to the inside in the left-right direction from the engaging portion, there is a risk that the article will be easily turned up when the force of the wearer's legs is applied to the protruding portion. By configuring the engaging portion to be located inside the inner end of the protruding portion, it is possible to prevent the article from being easily turned up.

[0032] In such a pants-type absorbent article, it is desirable that the engaging member is positioned on the non-skin side of the front waistband, and in the engaged state, the engaging member has a protruding portion that protrudes lower in the vertical direction than the lower edge of the front waistband, and that the protruding portion has a plurality of compression portions.

[0033] In such a pants-type absorbent article, the compressed parts increase the rigidity of the protruding parts, making it possible to prevent the protruding parts from turning up.

[0034] === Implementation form === A pants-type napkin 1 (hereinafter, simply referred to as "napkin 1") will be described below as an example of an absorbent article according to the present invention. Note that the absorbent article includes pants-type diapers and the like.

[0035] <Basic structure of Sanitary Napkin 1> Fig. 1 is a schematic perspective view of a napkin 1 according to the present embodiment. Fig. 2 is a plan view of the napkin 1 in an open and extended state, as viewed from the skin side in the thickness direction. Fig. 3 is a schematic cross-sectional view taken along line AA in Fig. 2.

[0036] The "stretched state" of the napkin 1 refers to a state in which the entire napkin 1 (whole product) is stretched without wrinkles by stretching each elastic member (e.g., absorbent body elastic member 50 and skin side sheets 22, 23, etc., described later) of the napkin 1, specifically, a state in which each member constituting the napkin 1 (e.g., non-skin side sheet 21 and skin side sheets 22, 23, etc., described later) is stretched until the dimensions of the member are equal to or close to the dimensions of the member alone. In this embodiment, when comparing the absorbent main body 10 portion, it is preferable to perform the measurement and comparison in a state in which the tab 30 is disengaged (peel-off state) and in a pants-type state (before being torn at the cut line 25). The tab 30 may be measured either after the napkin 1 is opened or in a disengaged state. The above-mentioned measurement method is an example, and other measurement methods may be used for measurement.

[0037] As shown in FIG. 1, the napkin 1 has a "vertical direction", a "lateral direction", and a "front-rear direction" that are perpendicular to each other. Also, as shown in FIG. 3, the napkin 1 has a "thickness direction" in which each member is layered. In the vertical direction, the side that is the wearer's waist when the wearer wears the napkin 1 is referred to as the "upper side", and the side that is the wearer's crotch side is referred to as the "lower side". In the front-rear direction, the side that is the wearer's stomach when worn is referred to as the "front side", and the side that is the wearer's back is referred to as the "rear side". In the thickness direction, the side that comes into contact with the wearer's skin when the wearer wears the napkin 1 is referred to as the "skin side", and the opposite side is referred to as the "non-skin side".

[0038] Furthermore, the napkin 1 has a "longitudinal direction" and a "left-right direction" that are perpendicular to each other in the unfolded state shown in Fig. 2. The "longitudinal direction" is the direction along the up-down direction in a pants-type garment, and the "left-right direction" is the same direction as the left-right direction in a pants-type garment.

[0039] The napkin 1 of this embodiment comprises a liquid-absorbent main body 10 that absorbs excretory fluids such as menstrual blood, a waistline member 20 that is arranged overlapping the absorbent main body 10 in the front-to-rear direction and that is placed around the wearer's waist when the napkin 1 is worn, and tabs 30 (corresponding to engaging members) provided on both the left-right sides of the waistline member 20.

[0040] (Absorbent body 10) As shown in Fig. 2, the absorbent main body 10 has a generally rectangular shape in plan view with its longitudinal direction aligned with the vertical direction of the napkin 1. As shown in Fig. 3, the absorbent main body 10 has an absorbent core 11 aligned with the longitudinal direction (vertical direction), a top sheet 12 arranged closer to the skin than the absorbent core 11, and a back sheet 13 arranged closer to the skin than the absorbent core 11. However, the absorbent main body 10 may also include sheet members other than those mentioned above. For example, a second sheet (not shown) may be provided between the top sheet 12 and the absorbent core 11 in the thickness direction.

[0041] The absorbent core 11 is a member that absorbs and retains liquids such as menstrual blood, and is formed of liquid-absorbent fibers such as pulp fibers mixed with superabsorbent polymer (SAP). 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 nonwoven fabric.

[0042] The top sheet 12 is a liquid-permeable sheet member that can come into contact with the wearer's skin when worn, and is formed, for example, from a hydrophilic air-through nonwoven fabric or a spunbond nonwoven fabric.

[0043] The back sheet 13 is formed in a two-layer structure including a liquid-impermeable sheet 13a for preventing liquid such as menstrual blood absorbed in the absorbent core 11 from leaking out to the outside, and a hydrophobic sheet 13b arranged on the non-skin side of the liquid-impermeable sheet 13a. For example, a resin film is used as the liquid-impermeable sheet 13a, and for example, a flexible nonwoven fabric is used as the hydrophobic sheet 13b. However, the hydrophobic sheet 13b is not necessarily provided, and the back sheet 13 may be composed of only the liquid-impermeable sheet 13a.

[0044] Furthermore, leakage preventing walls (not shown) may be provided on both the left and right sides of the absorbent main body 10. The leakage preventing walls are portions that correspond to so-called three-dimensional gathers, and when the napkin 1 is worn, the leakage preventing walls rise up from both the left and right sides of the absorbent main body 10 toward the wearer's skin, thereby preventing excreted liquid such as menstrual blood from leaking out of the absorbent main body 10.

[0045] As shown in Fig. 2 and Fig. 3, the absorbent body 10 of this embodiment is provided with a plurality of absorbent body elastic members 50 that stretch along the longitudinal direction (vertical direction). The absorbent body elastic members 50 are made of, for example, rubber thread, and are arranged on the non-skin side of the absorbent core 11 (between the liquid-impermeable sheet 13a and the hydrophobic sheet 13b in Fig. 3) in a state of stretching in the longitudinal direction (vertical direction). In the napkin 1 of this embodiment, five absorbent body elastic members 50 are provided at predetermined intervals in the left-right direction (see Fig. 2). The absorbent body 10 is lifted up to the wearer's skin side by the stretchability exhibited by the absorbent body elastic members 50, which makes it easier for the absorbent body 10 to come into close contact with the wearer's crotch area, and makes it difficult for excreted liquid such as menstrual blood to leak.

[0046] (Waist member 20) The waistline member 20 is an exterior body composed of multiple sheet members, and includes at least a non-skin side sheet 21 and skin side sheets 22, 23 (see FIG. 3). In the following description, the portion of the waistline member 20 that is in front of (on the ventral side of) the center position CL in the longitudinal direction is also referred to as a front waistline section 20f, and the portion that is behind (on the back side of) the center position CL is also referred to as a rear waistline section 20b. The front waistline section 20f is a portion that comes into contact with the ventral side of the wearer's body when the napkin 1 is worn. The rear waistline section 20b is a portion that comes into contact with the back side of the wearer's body when the napkin 1 is worn.

[0047] The non-skin side sheet 21 is a non-elastic sheet member arranged on the closest side to the skin of the napkin 1, and is made of, for example, a spunbond nonwoven fabric, an SMS nonwoven fabric, etc. In this embodiment, the non-skin side sheet 21 has a shape that is narrowed towards the inside in the left-right direction at the longitudinal center (part including the center position CL) as shown in the plan view of Fig. 2.

[0048] The skin-side sheet 22 is an elastic sheet member laminated on the skin side of the non-skin-side sheet 21 at the front side (ventral side) in the longitudinal direction. The skin-side sheet 22 is formed of, for example, elastic nonwoven fabric. The "elastic nonwoven fabric" refers to a nonwoven fabric that contains elastic fibers having elasticity and extensible fibers having lower shrinkage than the elastic fibers, and that has been subjected to an appropriate stretching process such as gear stretching. The skin-side sheet 22 of this embodiment can use, as the elastic fibers, fibers of polyurethane-based elastomer, which is a type of thermoplastic elastomer having elasticity, and can use, as the extensible fibers, fibers of polypropylene (PP), which is a type of thermoplastic resin having inelasticity.

[0049] The skin side sheet 22 is joined to the non-skin side sheet 21 by a plurality of sheet joints (not shown) scattered therebetween, thereby imparting stretchability at least along the left-right direction to the front waistline portion 20f. In this embodiment, the sheet joints are formed by a known joining means such as ultrasonic welding.

[0050] The skin side sheet 23 is an elastic sheet member laminated on the skin side of the non-skin side sheet 21 at the rear side (back side) in the longitudinal direction. The skin side sheet 23 has a structure similar to that of the skin side sheet 22. That is, the skin side sheet 23 is formed of an elastic nonwoven fabric, and is joined to the non-skin side sheet 21 by a plurality of scattered sheet joints (not shown). This provides the rear waistband portion 20b with elasticity at least in the left-right direction.

[0051] Note that sheet members constituting the waistline member 20 may include sheet members other than the non-skin side sheet 21 and the skin side sheets 22, 23. For example, the waistline member 20 may have a three-layer structure in which a non-stretchable nonwoven fabric is disposed on the skin side of the stretchable skin side sheets 22, 23, and the stretchable nonwoven fabric is sandwiched between the non-stretchable nonwoven fabrics. In the case of a three-layer structure, the skin side sheets 22, 23 may be stretchable films.

[0052] The napkin 1 is folded in half in the longitudinal direction (front-rear direction) from the unfolded state shown in Fig. 2, with the central position CL in the longitudinal direction (shown by a dashed line in Fig. 2) as the folding position, so that the skin side of the front waistline portion 20f and the skin side of the rear waistline portion 20b face each other. In this folded state, both left and right ends 40f, 40f of the front waistline portion 20f and both left and right ends 40b, 40b of the rear waistline portion 20b, which overlap each other in the front-rear direction, are joined by a known joining means such as seal welding to form a side joining portion 40. As a result, the waistline member 20 (20f and 20b) folded in half is connected in an annular shape at the front side (ventral side) and the rear side (back side), forming one waistline opening 1a and a pair of leg openings 1b as shown in Fig. 1, and forming a pants-type napkin 1.

[0053] (Engagement member 30) A pair of tabs 30 (corresponding to engaging members) are provided on both left and right sides of the napkin 1. The tabs 30 each have a base sheet 31 and an engaging portion 32.

[0054] The base sheet 31 is a sheet member made of nonwoven fabric or the like, and one side in the left-right direction (corresponding to the base end side) is joined to the waistline member 20 by a tab joint 35, and the other side in the left-right direction (corresponding to the tip end side) is provided with an engagement portion 32 (see FIG. 2). In this embodiment, the side joint 40 of the waistline member 20 described above is configured to also function as the tab joint 35. That is, the front waistline portion 20f, the rear waistline portion 20b, and the tab 30 are integrally joined by the side joint 40. However, the tab joint 35 may be provided separately from the side joint 40. For example, the tab 30 may be joined by the tab joint 35 to a predetermined region other than the side joint 40 in the front waistline portion 20f or the rear waistline portion 20b. The tab joint 35 may be formed by ultrasonic welding or the like like the side joint 40, or may be formed using an adhesive such as a hot melt adhesive.

[0055] The engaging portion 32 is a locking member for removably engaging the tab 30 with the waistband member 20, and is provided in a predetermined region of the skin side of the tab 30 (the region opposite (the tip side) of the tab joint portion 35 in the left-right direction). In this embodiment, the engaging portion 32 is a hook-and-loop fastener formed of, for example, polypropylene, and provided with a plurality of hook members (locking projections not shown) on the skin side. These locking projections are hooked onto fibers (loops) of a nonwoven fabric constituting the non-skin side sheet 21 provided on the outermost layer of the waistband member 20, whereby the engaging portion 32 (tab 30) is removably hooked onto the non-skin side of the waistband member 20. However, a configuration may be adopted in which hook members for locking are provided on the waistband member 20 side, and loop members for hooking the hook members are provided on the engaging portion 32 side.

[0056] 1, in a pants-type napkin 1, the engagement portion 32 of the tab 30 is engaged with the non-skin side of the front waistline portion 20f in an area laterally inward of the tab joint portion 35 (side joint portion 40). Note that in this embodiment, the tab 30 is disposed on the non-skin side of the waistline member 20 (front waistline portion 20f), and the engagement portion 32 is provided on the skin side of the tab 30, but a configuration in which the tab 30 is disposed on the skin side of the waistline member 20, and the engagement portion 32 is provided on the non-skin side of the tab 30, can also be exemplified.

[0057] <About putting on and taking off Sanitary Napkin 1> Next, a description will be given of the operation of putting on and taking off the napkin 1. In the initial state, the napkin 1 is in a pants-type (shorts-type) form as shown in Fig. 1, and can be worn as a normal pants-type absorbent article. When removing the napkin 1 from the body, the waistline member 20, which is formed in a ring shape along the waistline of the wearer, can be separated into the front waistline portion 20f and the rear waistline portion 20b, and the napkin 1 can be unfolded and removed.

[0058] Figures 4A and 4B are diagrams illustrating the operation of separating the waistline member 20 of the napkin 1 into a front waistline portion 20f and a rear waistline portion 20b. Figure 4A is a schematic cross-sectional view showing the napkin 1 in a pants-type state as viewed from the upper side (the side of the waistline opening 1a) in the up-down direction, and Figure 4B is a schematic cross-sectional view showing the state in Figure 4A where the front waistline portion 20f and the rear waistline portion 20b have been separated.

[0059] In the pants-type napkin 1, the front waist portion 20f and the rear waist portion 20b are joined together at side joining parts 40, 40 provided at both left and right ends to form an annular waist opening 1a as shown in Fig. 4A. A pair of tabs 30 are provided on both left and right sides of the waist portion 20, and the tabs 30 are engaged with the non-skin side of the front waist portion 20f by engaging parts 32.

[0060] 4A, a pair of separation parts 25 are provided on both sides in the left-right direction of the front waistline part 20f. The separation parts 25 are provided to separate the waistline member 20, which is formed in a ring shape along the waistline of the wearer, into a part including at least the center part of the front waistline part 20f and a part including at least the center part of the rear waistline part 20b, and are provided in the left-right direction in any of the areas from the side joint part 40 to the part where the engagement part 32 is engaged. The separation parts 25 are, for example, perforations along the up-down direction (see FIG. 2), and the waistline member 20 can be easily separated into a part including at least the center part of the front waistline part 20f and a part including at least the center part of the rear waistline part 20b by tearing the waistline member 20 along the perforations.

[0061] In addition, since the side joints 40 of the napkin 1 are formed by ultrasonic welding, the rigidity of the side joints 40 is higher than that of other regions of the waistline member 20. Therefore, it is also possible to tear the waistline member 20 along the inner ends in the left and right direction of the side joints 40, where the rigidity difference is large in the waistline member 20. In this case, since the inner ends of the side joints 40 become the separation portions 25, it is not necessarily necessary to provide perforations or the like.

[0062] The napkin 1 separated at the separation portion 25 into a portion including at least the center of the front waistline portion 20f and a portion including at least the center of the rear waistline portion 20b is in the state shown in FIG. 4B. That is, the separation portion 25 in FIG. 4A is separated into a separation end 25fe on the front waistline portion 20f side and a separation end 25be on the rear waistline portion 20b side. In FIG. 4B, a pair of tabs 30, 30 are joined to the rear waistline portion 20b via tab joints 35 (side joints 40) on both the left and right sides, and the engagement portions 32, 32 provided on the tabs 30, 30 are engaged with the front waistline portion 20f. As a result, the waistline member 20 is formed in a ring shape. When the napkin 1 in this state is to be removed from the wearer's body, the engagement portion 32 is peeled off from the front waistline portion 20f, and the napkin 1 is unfolded and can be easily removed.

[0063] 5 is an expanded plan view of the napkin 1 in a state where the waistline member 20 has been separated along the separation portions 25 on both the left and right sides. The separated napkin 1 can be used as a so-called tape-type napkin in which tabs 30 with engagement portions 32 are provided on both the left and right sides of the rear waistline portion 20b. In other words, the napkin 1 of this embodiment can be used as both a pants-type and a tape-type.

[0064] Conventional pants-type napkins are difficult to put on and take off in places such as toilets where it is difficult for the wearer to take off trousers or shoes, but the napkin 1 of this embodiment can be easily removed by separating the waist member 20 at the separation part 25. Also, by separating the waist member 20 of a new napkin 1 in advance at the separation part 25 and leaving it in an unfolded state, it can be used as a tape-type napkin, so that it can be easily put on and taken off even in an environment where it is difficult to take off trousers or shoes.

[0065] In such pants-type napkins, in order to make the napkin look more like underwear, the position where the vertical length of the waistband member 20 is shortest is usually set to the position of the side joint 40. The part of the waistband member 20 from the vicinity of the lower end of the side joint 40 toward the crotch is the part where the thickest part of the thigh rubs and is subjected to force when the wearer wears the pants-type napkin and walks. As a result, the front waistband portion 20f in particular is pulled and stretched in the left and right directions, and the pulling force is applied to the side joint 40, which may cause the front waistband portion 20f to be stretched, resulting in a feeling of discomfort around the thighs. However, if the vertical length of the waistband member 20 is shortened from the vicinity of the lower end of the side joint 40 toward the crotch in order to reduce rubbing against the thighs, not only will it be easy to arouse the wearer's sense of insecurity, but it may also be easy for the shortened part to tear.

[0066] In contrast, the napkin 1 of this embodiment has the following configuration. FIG. 6 is an enlarged view of a portion of the napkin 1 in its natural state. Specifically, the packaged product (napkin 1) is taken out and spread out, and the vicinity of one of the tabs 30, 30 on both sides in the left-right direction is shown as viewed from the front side (abdominal side). Here, the engaging portion 32 of the tab 30 is engaged with the front waistline portion 20f. As shown in FIG. 6, the tab 30 in this embodiment has a protruding portion 30T (a region indicated by diagonal lines slanting downward to the right in FIG. 6) that protrudes downward in the up-down direction from the lower edge 20feg of the front waistline portion 20f. More specifically, the lower end 30ebn of the side edge 30eb on the side joint portion 40 side (base end side) of the tab 30 is located below the lower end 20fen of the side end 20fe of the front waistline portion 20f. As a result, on the front side (ventral side) of the napkin 1 of this embodiment, part of the lower edge 20feg of the front waist portion 20f and part of the lower edge 30ge of the tab 30 define part of the leg openings 1b (see Figures 1 and 6).

[0067] Since the tab 30 has a protruding portion 30T protruding downward from the lower edge 20feg of the front waistline portion 20f, the protruding portion 30T easily fits the thigh of the wearer when worn, and can form a shape like shorts. When the lower edge 20feg of the front waistline portion 20f hits the thigh when the wearer walks, the front waistline portion 20f having elasticity may be pulled in the left-right direction, causing discomfort, or the part where the thigh hits may be turned up. However, since the tab 30 is joined only on one side in the left-right direction (the base end side), the tension is lower than that of the waistline member 20f. Therefore, discomfort is unlikely to occur even if the thigh touches the protruding portion 30T of such a tab 30. In addition, the presence of the protruding portion 30T of the tab 30 can give the wearer a sense of security even if the vertical length of the front waistline portion 20f located on the skin side of the tab 30 is shortened. Furthermore, by covering such a short part with the tab 30, the front waistline portion 20f can be made less likely to tear.

[0068] In this embodiment, the front waistline portion 20f, the rear waistline portion 20b, and the tab 30 are integrally joined by the side joint 40. Since the protruding portion 30T protrudes downward from the lower edge 20feg of the front waistline portion 20f, the side end portion 30Ta on the base end side (side joint 40 side) of the protruding portion 30T is joined to the rear waistline portion 20b at the side joint 40. Therefore, even if the protruding portion 30T of the tab 30 hits the thigh when worn, the protruding portion 30T can be firmly held down and is unlikely to be turned up. In addition, since the side joint 40 has high rigidity, by providing a part of the protruding portion 30T at such a side joint 40, the protruding portion 30T can be unlikely to be turned up. Also, for example, if the vertical length of the side end fe of the front waistline portion 20f is shortened without providing the engaging member 30, the area covering the buttocks is reduced, and the hemline of the rear waistline portion 20b may slide up due to the wearer's movement. However, as in this embodiment, the side edge (side end) 30eb on the base end side of the protruding portion 30T is joined to the side end of the rear waistline portion 20b, so that even if the vertical length of the side end fe of the front waistline portion 20f is shortened, the rear waistline portion 20b can secure a large area covering the buttocks by the length joined to the protruding portion 30T, and the hemline of the rear waistline portion 20b can be prevented from sliding up.

[0069] 6, the upper edge 20fug of the front waistline portion 20f defines a part of the waistline opening 1a. When the engagement portion 32 is engaged with the front waistline portion 20f, the upper edge 30gu of the tab 30 is located below the upper edge 20fug of the front waistline portion 20f. If a part of the tab 30 protrudes from the edge (upper edge 20fug) of the waistline opening 1a, the protruding part may come into contact with the wearer's stomach and cause discomfort. However, by locating the tab 30 on the non-skin-facing side of the front waistline portion 20f and below the upper edge 20fug, such discomfort can be prevented.

[0070] 6, the tab 30 is disposed 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. In this way, by being able to visually confirm the separation portion 25 before putting on the napkin 1, the wearer can easily determine at what position the front waistline portion 20f should be torn, and can easily proceed with the tearing action along the separation portion 25 smoothly.

[0071] 6, at least a part of the engagement portion 32 of the tab 30 is located inside the inner end 30Tin of the protrusion 30T in the left-right direction. The tip side of the tab 30 (the side where the engagement portion 32 is provided) is a so-called free end, and if the protrusion 30T is provided further inside in the left-right direction than the engagement portion 32, there is a risk that the protrusion 30T will be easily turned up when the force of the wearer's legs is applied to it. By configuring so that at least a part of the engagement portion 32 is located inside the inner end 30Tin of the protrusion 30T in the left-right direction, it is possible to prevent the protrusion 30T from being easily turned up.

[0072] In addition, in the napkin 1 of this embodiment, it is preferable that the color of the non-skin side of the front waist portion 20f (entire) and the color of the non-skin side of the tab 30 (entire) are similar colors. For example, in nursing diapers different from the napkin 1 of this embodiment, a white tab is provided with a blue or green engagement part, and the color of the engagement part is visible from the outside of the diaper, and the colors of the non-skin side of the front waist portion and the tab are often different. Therefore, by making the colors of the non-skin side of the front waist portion and the tab similar colors, as in the napkin 1 of this embodiment, the diaper-like appearance is reduced and the appearance of the napkin 1 is improved.

[0073] In the above case, however, it is difficult for the wearer to grasp the position of the engagement portion 32 from the non-skin side of the napkin 1. Therefore, it is preferable that the tab 30 has a plurality of compressed portions CP (see FIG. 6) in which the tab 30 is compressed in the thickness direction in the region where the engagement portion 32 is arranged. This makes it easier to grasp the position of the engagement portion 32 from the non-skin side of the tab 30, makes it easier to engage the tab 30 with the front waistline portion 20f, and improves the fit of the napkin 1. The compressed portions 33 may be compressed from the skin side or the non-skin side of the tab 30, and in either case, the compressed portions 33 are visible from the outside (non-skin side) of the tab 30.

[0074] Furthermore, although the engaging portion 32 is often bonded to the base sheet 31 constituting the tab 30 only with an adhesive, the compressed portion CP increases the bonding strength between the tab 30 and the engaging portion 32. Therefore, the engaging portion 32 does not peel off from the tab 30, and the tab 30 can be reattached. Also, the tab 30 can be prevented from coming off while the napkin 1 is being worn.

[0075] Note that similar colors refer to colors that are different in hue less than 5, value less than 1, or saturation less than 1 in the Munsell color system (100 hues), and this includes cases where the colors are the same. Preferably, the color difference ΔE is less than 1. The color difference is measured as follows. (1) Prepare an X-Rite eXact Standard (measurement diameter: 1.5 mm) manufactured by X-Rite. (2) CIE L of the part of the sample to be measured (the non-skin side of the front waist part 20f) * a * b * Measure the coordinates at 10 or more points at different positions and calculate the average value (L1 * ,a1 * ,b1 * ) is calculated. (3) CIE L of the part of the sample to be compared (non-skin side of Tab 30) * a * b * Measure the coordinates at 10 or more points at different positions and calculate the average value (L2 * ,a2 * ,b2* ) is calculated. (4) Calculate the color difference ΔE from the above results (ΔE = [(L1 * -L2 * ) 2 +(a1 * -a2 * ) 2 +(b1 * -b2 * ) 2 〕 1 / 2

[0076] FIG. 7 is a simplified diagram of the lower part of the tab 30 shown in FIG. 6. In FIG. 7, the configuration of the side joint 40 (tab joint 35) and the like is omitted in order to make the shape of the tab 30 easier to understand. As shown in FIG. 7, at least a part of the lower edge 30ge of the tab 30 has a curved portion 30y. Specifically, the curved portion 30y shown in the figure extends from the outer side in the left-right direction to the inner side in the left-right direction and to the upper side in the up-down direction when the engagement portion 32 of the tab 30 is engaged with the waistline portion 20f. The wearer engages the tab 30 with the front waistline portion 20f while pulling the tab 30 toward the inner side in the left-right direction, but since the curved portion 30y of the lower edge 30ge of the tab 30 extends to the inner side in the left-right direction and to the upper side, the force pulling the tab 30 is easily transmitted in the same direction (inner side and upper side in the left-right direction). This makes it easier to pull up in the same direction. In addition, by having such a curved portion 30y, the outer shape of the napkin 1 can be made to look beautiful.

[0077] In this embodiment, the lower edge 30ge of the tab 30 has a further curved portion further inside in the left-right direction than the above-mentioned curved portion 30y. Specifically, the lower edge 30ge has an inflection point Q where the curve changes from an upwardly convex state (the curved portion 30y in FIG. 7) to a downwardly convex state, and the inflection point Q is located above the lower end (lower edge) 20feg of the front waistline portion 20f. Since the curve from the inflection point Q toward the inside in the left-right direction is in a downwardly convex state, if 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 part of the inflection point Q and the part inside the left-right direction from the inflection point Q will touch the wearer's thigh, causing discomfort. However, by positioning the inflection point Q above the lower end (lower edge) 20feg, it is possible to prevent such discomfort from occurring.

[0078] As shown in FIG. 7, the tab 30 of this embodiment has a plurality of compressed portions CP at the periphery where the tab 30 is compressed in the thickness direction. In FIG. 6, the compressed portions CP at the periphery are omitted for convenience of explanation of the configuration of the tab 30. The peripheral portion here is preferably a portion having a width of about 3 mm inward from the periphery of the tab 30. As shown in FIG. 7, in this embodiment, the compressed portions CP are formed in a dot shape along the outer peripheral shape of the tab 30, but may be formed in a line shape or may be formed only on the protruding portion 30T. By having a plurality of compressed portions CP at the periphery, the rigidity of the tab 30 is increased, making it easier to grasp. In addition, by having a plurality of compressed portions CP at the protruding portion 30T, the rigidity of the protruding portion 30T is also increased, and it is possible to more effectively prevent the protruding portion 30T from turning over when worn.

[0079] Fig. 8 is a schematic plan view of the napkin 1 in a state where the tab 30 in the product state is opened outward in the left-right direction and unfolded and stretched, as seen from the skin side. As shown in Fig. 8, the longitudinal length of the waistline member 20 (front waistline portion 20f, rear waistline portion 20b) on the side of the side end 10ea of ​​the absorbent main body 10 is longer than the longitudinal length (Lf, Lb) of the waistline member 20 (front waistline portion 20f, rear waistline portion 20b) at the central position CB in the left-right direction between one side end 10ea of ​​the absorbent main body 10 in the left-right direction and one side end 40E of the waistline member 20 (front waistline portion 20f, rear waistline portion 20b). In other words, compared with the length (Lf, Lb) at the central position CB, it is longer toward the crotch side. By configuring the waist member 20 to cover a larger area toward the crotch and a smaller area toward the left and right outside, the wearer can move their thighs more easily when wearing the garment, and discomfort can be reduced. Also, by making the length of the waist member 20 on the absorbent main body 10 side (crotch side) longer in the longitudinal direction, the groin area can be prevented from being exposed, and anxiety about leakage can be reduced.

[0080] In addition, the vertical length of the protruding portion 30T of the tab 30 is the longest at the side end portion 30e on the side joint portion 40 side (base end side) of the tab 30, and the vertical length becomes shorter toward the inside in the left-right direction (see FIG. 6). Since the vertical length of the waistband member 20 is configured to become longer toward the center (inner side) in the left-right direction as shown in FIG. 8, that is, the length (width) increases toward the side where the wearer's thighs gradually become thinner (toe side), it is preferable that the protruding portion 30T protrudes less toward the inside in the left-right direction (i.e., the length in the longitudinal direction becomes shorter). By doing so, the protruding portion 30T can easily fit the thighs. In addition, it is possible to approach a shape that resembles shorts while making the outer shape look beautiful.

[0081] Returning to FIG. 2, the front waistband portion 20f is provided with a front leg elastic member 28 along the lower edge in the up-down direction (i.e., the outline of the leg openings 1b). The front leg elastic member 28 is an elastic member such as rubber thread, and is arranged between the non-skin side sheet 21 and the skin side sheet 22 in the thickness direction, stretching from one side to the other in the left-right direction (see FIGS. 2, 3, etc.). Similarly, the rear waistband portion 20b is provided with a rear leg elastic member 29 along the lower edge in the up-down direction (i.e., the outline of the leg openings 1b). The rear leg elastic member 29 is an elastic member such as rubber thread, and is arranged between the non-skin side sheet 21 and the skin side sheet 23 in the thickness direction, stretching from one side to the other in the left-right direction (see FIGS. 2, 3, etc.).

[0082] In order to allow the front leg elastic member 28 and the rear leg elastic member 29 to fit more closely to the contour of the leg opening 1b, it is desirable that the front leg elastic member 28 and the rear leg elastic member 29 each have curved portions 28cv, 28cv, 29cv, 29cv (Figure 2) that curve from the inside in the left-right direction to the outside and upward in the left-right direction, as in this embodiment.

[0083] By providing these leg opening elastic members 28, 29, stretchability is imparted along the leg openings 1b of the napkin 1, making the leg openings 1b easier to fit around the legs of the wearer. In particular, in the rear waistline portion 20b, the leg openings 1b are likely to rise up from the wearer's body (buttocks) or become displaced due to the influence of the wearer's buttocks protruding or leg movements by the wearer. Therefore, by providing the rear leg opening elastic member 29 that stretches along the leg openings 1b, the fit of the rear waistline portion 20b can be improved around the legs on the buttocks side of the wearer, making it less likely that the wearer will feel uncomfortable or unnatural. In addition, since the side joints 40 have portions that overlap with the rear leg elastic members 29 in the thickness direction, i.e., the side joints 40 intersect with the rear leg elastic members 29 when viewed in the thickness direction, the side joints 40 are pulled up diagonally outward in the left-right direction to fit the shape of the wearer's buttocks by the elastic force of the curved portions 29cv of the rear leg elastic members 29. This makes it difficult for gaps to form between the joints and the wearer's crotch, thereby preventing leakage of body waste.

[0084] Then, when the waistline member 20 is separated along the pair of separation portions 25 provided on the front waistline portion 20f from the rear waistline elastic member 29, and then the tab 30 is engaged with the non-skin side of the front waistline portion 20f, the following action and effect can be obtained. First, when the front waistline portion 20f is cut along the separation portions 25 before wearing, and the waistline member 20 is separated into a portion including at least the center of the front waistline portion 20f and a portion including at least the center of the rear waistline portion 20b, the tab 30 is located on both the left and right sides of the rear waistline portion 20b, as shown in Fig. 5. Then, when the tab 30 is spread out in the left and right direction while the napkin 1 is in an unfolded and stretched state as shown in Fig. 5, the curved portion 30y of the lower edge 30ge of the tab 30 extends from the inside in the left and right direction to the outside and upper side in the left and right direction. That is, the direction in which the curve of the curved portion 30y extends is the same as the direction of curvature of the curved portion 29cv of the rear leg elastic member 29 (from the inside in the left-right direction to the outside and upward in the left-right direction). Since the curved 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, when the tab 30 is pulled to engage with the front waistline portion 20f after separation, the force of pulling the tab 30 is easily transmitted to the rear leg elastic member 29. Since the force of pulling the tab 30 to adjust the waist position is easily transmitted to the rear leg elastic member 29, the rear waistline portion 20b is easily positioned at an appropriate position, improving the fit.

[0085] In the present embodiment, the curved portions 28cv, 28cv, 29cv, 29cv of the front leg elastic member 28 and the rear leg elastic member 29 are curved from the inside in the left-right direction toward the outside and upper side in the left-right direction, but are not limited thereto and may be linear shapes extending in the same direction. That is, for example, the rear leg elastic member 29 may extend along the rear leg of the wearer.

[0086] Fig. 9 is a plan view showing the state in which the napkin 1 in the tape-type state is stretched again into a pants-type. Fig. 9 shows the state in which the napkin 1 in the unfolded and stretched state shown in Fig. 5 is folded in half at the center position CL in the longitudinal direction, and the pair of engagement parts 32, 32 are engaged with the front waistline part 20f to form a pants-type. In such a stretched pants-type state, the napkin 1 has an intersection point P where the lower edge 30ge of the tab 30 and the lower edge 20feg of the front waistline part 20f intersect. The lower edge 30ge of the tab 30 draws a curve extending from the intersection point P outward in the left-right direction and downward in the up-down direction, and the lower edge 20feg of the front waistline part 20f draws a curve extending from the intersection point P inward in the left-right direction and downward in the up-down direction. Comparing the curves of the lower edges (30ge, 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 waistline portion 20f. The curvature of the curve here refers to the local curvature of the curve, and the greater the curvature, the tighter the curvature (the sharper the curve), and the smaller the curvature, the looser the curvature (the gentler the curve). In addition, since the curves of the lower edges 30ge and 20feg are not of a constant curvature, the maximum values, that is, the points where the curvature is tightest, are compared. In this embodiment, the maximum value of the curvature of the curve of the lower edge 30ge of the tab 30 is greater (i.e., the curve of the lower edge 30ge of the tab 30 is tighter), and therefore, when worn, an appearance closer to shorts can be obtained. Furthermore, with this configuration, even if the tab 30 is engaged further inward in the left-right direction when worn, i.e., engaged to fit a slimmer waistline, it is easier to secure the protrusion 30T against the lower edge 20feg of the front waistline portion 20f, which has a smaller curvature (gentler curve).

[0087] ===Other embodiments=== The above-mentioned embodiment is for the purpose of facilitating understanding of the present invention, and is not intended to limit the present invention. The present invention can be modified or improved without departing from the spirit of the present invention, and it goes without saying that the present invention includes equivalents thereof.

[0088] In the above embodiment, elastic sheets such as elastic nonwoven fabrics are used as the skin side sheets 22, 23 constituting the waistline member 20 to impart elasticity in the left-right direction to the waistline member 20, but other elastic members may be provided in the waistline member 20. For example, as shown in Fig. 2, waistline elastic members 27 such as rubber threads may be provided at the upper ends of the front waistline portion 20f and the rear waistline portion 20b so as to be elastic in the left-right direction. By providing such waistline elastic members 27, the fit at the waistline opening 1a is improved, and the positional shift of the waistline member 20 can be suppressed when the napkin 1 is worn.

[0089] In the above embodiment, the tabs 30 are provided on both the left and right sides of the waistband member 20, but they may be provided on only one side. For example, when in use, the tab 30 provided on only one side may be pulled to easily tear along the left and right inner end of the side joint portion 40, which has a large rigidity difference in the front waistband portion 20f. This results in a pants-type napkin that can be unfolded on only one side when in use. In this case, since the left and right inner end of the side joint portion 40 functions as the separation portion 25 of this embodiment, perforations or the like are not necessarily provided. [Explanation of symbols]

[0090] 1. Napkins (pants-type absorbent articles), 1a waist opening, 1b leg opening, 10 Absorbent body, 11 absorbent core, 12 Top sheet, 13 back sheet, 13a liquid impermeable sheet, 13b hydrophobic sheet, 20 waist member, 20f front waist, 20fe side end, 20fen bottom end, 20b rear waistband, 20feg lower edge 21 non-skin side sheet, 22 skin side sheet, 23 skin side sheet, 25 separation part, 25fe separation end, 25be separation end, 27 waist elastic member, 28 front leg elastic member, 28cv curved portion, 29 rear leg elastic member, 29cv curved portion, 30 tab (engagement member), 30e side end, 30eb side edge, 30ebn bottom end, 30ge lower edge, 30gu upper edge, 30y curved part, 30T protrusion, 31 base sheet, 32 engagement portion, 35 tab joint portion, 40 side joint, 40f end, 40b end, 50 absorbent elastic member, CL: central position, CP: compression part, P intersection, Q inflection point,

Claims

1. The vertical direction, the horizontal direction, and the front-rear direction intersect with each other, An absorbent body; A waistline member including a front waistline portion and a rear waistline portion, the front waistline portion and the rear waistline portion being overlapped with the absorbent body in the front-rear direction; An engaging member having a base end side joined to the waistband member and an engaging portion on a tip end side, A pants-type absorbent article in which the front waistband and the rear waistband are joined, In a state where the engagement portion is engaged with the front waist portion, a lower end of the side edge of the base end side of the engaging member is located lower than a lower end of the side edge of the front waistline portion, and a part of the lower edge of the front waistline portion and a part of the lower edge of the engaging member define a part of the leg opening; After being extended, in a state where the engaging member is engaged, an intersection point where the lower edge of the engagement member and the lower edge of the front waistband portion intersect; A pants-type absorbent article characterized in that the maximum value of the curvature of the curve along the lower edge of the engaging member extending from the intersection point outward in the left-right direction and downward in the up-down direction is greater than the maximum value of the curvature of the curve along the lower edge of the front waistband portion extending from the intersection point inward in the left-right direction and downward in the up-down direction.

2. The pants-type absorbent article according to claim 1, In the engaged state, The engaging member has a protruding portion that protrudes downward in the up-down direction beyond the lower edge of the front waistband portion, The side end portion on the base end side of the protruding portion is joined to the rear waistband portion. A pants-type absorbent article characterized by:

3. The pants-type absorbent article according to claim 1 or 2, the engaging member is disposed on a non-skin side of the front waistline portion, In the engaged state, An upper edge of the front waist portion defines a part of a waist opening, The upper edge of the engagement member is located below the upper edge of the front waistband portion. A pants-type absorbent article characterized by:

4. The pants-type absorbent article according to any one of claims 1 to 3, When the engaging members are opened outward in the left-right direction to stretch and unfold the pants-type absorbent article, the pants-type absorbent article has a longitudinal direction and a left-right direction, The length of the waistline member in the longitudinal direction at the side end side of the absorbent main body is longer than the length of the waistline member in the longitudinal direction at a central position in the left-right direction between a side end on one side of the absorbent main body in the left-right direction and a side end on one side of the waistline member in the left-right direction. A pants-type absorbent article characterized by:

5. The pants-type absorbent article according to claim 4, In the engaged state, The engaging member has a protruding portion that protrudes downward in the up-down direction beyond the lower edge of the front waistband portion, The length of the protrusion in the up-down direction is longest at the side end portion on the base end side of the engagement member. A pants-type absorbent article characterized by:

6. The pants-type absorbent article according to any one of claims 1 to 5, Before wearing, A pair of separation sections are provided on both sides of the front waistline section in the left-right direction to separate the waistline member into a portion including at least a central portion of the front waistline section and a portion including at least a central portion of the rear waistline section, the engaging member is disposed on a non-skin side of the front waistband portion and so as to cover at least a portion of the separation portion; The upper end of the separation portion is located above the upper end of the engagement member. A pants-type absorbent article characterized by:

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

8. The pants-type absorbent article according to claim 6 or 7, The rear waistband portion is provided with rear leg elastic members along a lower edge portion in the up-down direction, and the rear leg elastic members extend along the rear leg opening from an inner side in the left-right direction toward an outer side and an upper side in the left-right direction, In a state in which the waistline member is separated along the separation portion into a portion including at least a central portion of the front waistline portion and a portion including at least a central portion of the rear waistline portion, the engaging members are located on both sides of the rear waistline portion in the left-right direction, When the engaging member is deployed in the left-right direction, a curved portion of the lower edge of the engaging member extends from an inner side in the left-right direction to an outer side and an upper side in the left-right direction. A pants-type absorbent article characterized by:

9. The pants-type absorbent article according to any one of claims 1 to 8, the engaging member is disposed on a non-skin side of the front waistline 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 where the curved portion changes from an upwardly convex state to a downwardly convex state; The inflection point is located above the lower end of the front waistband portion. A pants-type absorbent article characterized by:

10. The pants-type absorbent article according to any one of claims 1 to 9, In the engaged state, The engaging member has a protruding portion that protrudes downward in the up-down direction beyond the lower edge of the front waistband portion, In the left-right direction, at least a portion of the engaging portion of the engaging member is located inside of an inner end of the protruding portion. A pants-type absorbent article characterized by:

11. The pants-type absorbent article according to any one of claims 1 to 10, the engaging member is disposed on a non-skin side of the front waistline portion, In the engaged state, The engaging member has a protruding portion that protrudes downward in the up-down direction beyond the lower edge of the front waistband portion, The protrusion has a plurality of pressed portions. A pants-type absorbent article characterized by:

Images