Absorbent panty-type items

Abstract

To provide a pair of absorbent pants that, when worn, have areas where fingers can easily get caught, making it easy to widen the waist opening, while also being less prone to tearing by fingers. [Solution] In the ventral portion A and dorsal portion B, when the region located outside the longitudinal end 4E of the absorbent body 4 is defined as the waist region D, the outer casing 3 has, at least in the waist region D of the ventral portion A, a first low-strength portion 15 and first and second high-strength portions 16 and 17 located on both sides of the first low-strength portion 15 in the longitudinal direction X, with the tensile strength in the longitudinal direction X being higher than that of the first low-strength portion 15. The first high-strength portion 16 includes the longitudinal end WE of the outer casing 3 that forms the waist opening, and the second high-strength portion 17 is located inward in the longitudinal direction X from the first low-strength portion 15.

Description

[Technical Field]

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

[0002] Absorbent pants typically comprise an absorbent core that absorbs and retains bodily fluids, and an outer casing positioned on the non-skin-facing side of the absorbent core. The outer casing has a lateral region where the outer casing is positioned on the wearer's ventral side (ventral outer casing) and a lateral region where the outer casing is positioned on the wearer's back side (back outer casing) are joined together to form a pair of side seals. An annular waistband, a waist opening, and a pair of leg openings are also formed around the wearer's waist. The ventral and back outer casings have multiple thread-like elastic members arranged intermittently in the longitudinal direction, which are stretchable laterally, to enhance the fit to the wearer's body, giving the entire waistband area elasticity in the waist direction.

[0003] To further improve fit, techniques are known for using stretchable sheets as the sheet material constituting the exterior body, or for adjusting the placement or elongation rate of elastic members (see Patent Document 1). [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2021-132700 [Overview of the project] [Problems that the invention aims to solve]

[0005] Incidentally, when a wearer puts on a pull-up type disposable diaper themselves, they typically put both their legs through the pair of leg openings in the diaper, then grasp the opening edge of the waist opening of the diaper or its vicinity by hooking their fingertips onto the inner (skin-facing) side, and pull it towards the wearer's crotch. This "pulling" of the diaper becomes "pulling up" if the wearer is standing. When a third party puts on a pull-up type disposable diaper, for example, when a mother or caregiver puts a diaper on an infant or person being cared for, the procedure is usually substantially the same as described above, except that it is done by a third party rather than the wearer.

[0006] For the process of putting on these pull-up type disposable diapers to be smooth, it is important to make it easy to widen the waist opening. To achieve this, one might consider reducing the amount of material near the waist opening. However, in that case, there is a risk that the diaper may unintentionally tear when fingers are placed near the waist opening during the pulling-up process.

[0007] Therefore, the object of the present invention is to provide a pant-type absorbent article that, when worn, has areas where fingers can easily get caught, making it easy to widen the waist opening, and is less prone to tearing by fingers. [Means for solving the problem]

[0008] The present invention relates to a pant-type absorbent article comprising an abdominal portion positioned on the wearer's abdominal side, a dorsal portion positioned on the wearer's back, and a crotch portion located between the abdominal and dorsal portions, having an absorbent core having a longitudinal direction extending from the abdominal portion through the crotch portion to the dorsal portion and a transverse direction perpendicular to the longitudinal direction, and an outer casing constructed by laminating a plurality of sheet materials and fixing the absorbent, having a waist opening and a pair of leg openings. In one embodiment, when the region located outside the longitudinal end of the absorbent material in the ventral and dorsal portions is defined as the waist region, it is preferable that the outer casing has, at least in the waist region of the ventral portion, a first low-strength portion and first and second high-strength portions located on both sides in the longitudinal direction flanking the first low-strength portion, each having a longitudinal tensile strength higher than that of the first low-strength portion. In one embodiment, it is preferable that the first high-strength portion includes the vertical end of the exterior body that forms the waist opening, and the second high-strength portion is located further inward in the vertical direction than the first low-strength portion. [Effects of the Invention]

[0009] The present invention relates to providing a pant-type absorbent article that, when worn, has areas where fingers can easily get caught, making it easy to widen the waist opening, and that is less prone to tearing by fingers. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 is a diagram showing one embodiment of the pants-type disposable diaper of the present invention, and is a schematic unfolded plan view showing the skin-facing side of the diaper in an unfolded and stretched state. [Figure 2] Figure 2 is an exploded perspective view of the disposable diaper shown in Figure 1. [Figure 3] Figure 3 is a cross-sectional view taken along line II-II in Figure 1. [Modes for carrying out the invention]

[0011] The present invention will be described below with reference to the drawings, based on preferred embodiments thereof. Figures 1 to 3 show one embodiment of the pants-type disposable diaper 1 of the present invention (hereinafter simply referred to as "diaper 1"). As shown in Figure 1, diaper 1 has an abdominal portion A that is positioned on the wearer's abdominal side when worn, a dorsal portion B that is positioned on the wearer's back side, and a crotch portion C located between the abdominal portion A and the dorsal portion B. The crotch portion C is the part that is positioned in the wearer's crotch area when diaper 1 is worn. The abdominal portion A is the part that is positioned on the wearer's abdominal side, i.e., in front of the crotch portion C when diaper 1 is worn. The dorsal portion B is the part that is positioned on the wearer's back side, i.e., in rear of the crotch portion C when diaper 1 is worn. As shown in Figure 1, diaper 1 has a longitudinal direction X corresponding to the wearer's front-to-back direction and a transverse direction Y perpendicular to it. In this specification, "wearer's front-to-back direction" refers to the direction extending from the wearer's ventral side through the crotch area to the dorsal side. Diaper 1 extends in the longitudinal direction X from the ventral side A through the crotch area C to the dorsal side B.

[0012] As shown in Figure 1, diaper 1 is divided into a front panel F, which is positioned on the front (abdominal) side of the wearer when worn, and a back panel R, which is positioned on the back (rear) side of the wearer, with the vertical center line (vertical center line CLx) as the boundary. The vertical center line CLx is a hypothetical straight line that bisects diaper 1 in its unfolded and stretched state, as shown in Figure 1, in the vertical direction X and extends in the horizontal direction Y. The "unfolded and stretched state" of diaper 1 refers to the state in which diaper 1 is separated at the side seal section described later to unfold it, and then the elastic members of each part of the unfolded diaper 1 are stretched to the design dimensions (the same dimensions as when spread flat in a planar state with the influence of the elastic members completely eliminated). In this specification, unless otherwise specified, the dimensions of each part of the diaper 1 (e.g., the absorbent core 40), such as the length (width) in the vertical X or horizontal Y direction, refer to the dimensions (design dimensions) when the elastic members of each part are stretched and the members are extended.

[0013] The diaper 1 comprises an absorbent body 4 and an outer casing 3 that secures the absorbent body 4. More specifically, it comprises an absorbent main body 5 having a liquid-retaining absorbent body 4 and an outer casing 3 that secures the absorbent main body 5 to the center of the diaper 1 in the vertical X and horizontal Y directions. The outer package 3 has both side edges AS and BS along the longitudinal direction X in the ventral part A and the dorsal part B respectively, which are joined to each other by known joining means such as adhesives, heat sealing, ultrasonic sealing, etc. Thereby, the diaper 1 has a pair of side seal parts (not shown) where both side edges AS and BS are joined, and further has a waist opening through which the wearer's torso passes, and a pair of leg openings through which the wearer's lower limbs pass (not shown).

[0014] In this specification, the "skin-facing surface" is the surface of the disposable diaper or its component (for example, the surface sheet 12) that is directed toward the skin side of the wearer when the disposable diaper is worn, that is, the side relatively closer to the wearer's skin, and the "non-skin-facing surface" is the surface of the disposable diaper or its component that is directed to the side opposite to the skin side when the disposable diaper is worn, that is, the side relatively farther from the wearer's skin. Here, the "when worn" means the normal proper wearing position, that is, the state where the correct wearing position of the absorbent article (disposable diaper) is maintained.

[0015] The absorbent main body 5 has a rectangular shape in plan view and extends in the longitudinal direction X. With its longitudinal direction aligned with the longitudinal direction X of the diaper 1 in the unfolded and extended state, it is arranged at the central part in the lateral direction Y of the outer package 3. The absorbent main body 5 is joined to the outer package 3 by known joining means such as adhesives.

[0016] The absorbent main body 5 includes a liquid-permeable surface sheet 1 forming the skin-facing surface, a liquid-impermeable or liquid-hardly-permeable or water-repellent leakage-preventing sheet 13 forming the non-skin-facing surface, and a liquid-retaining absorbent body 4 disposed between these surface sheet and the leakage-preventing sheet, and these are integrally formed by known joining means such as adhesives. The absorbent body 4 of this embodiment comprises an absorbent core 40 and a core wrap sheet covering the surface of the absorbent core 40. In this embodiment, the entire surface of the absorbent body 4, including the skin-facing surface and the non-skin-facing surface, is covered with the core wrap sheet. Alternatively, the skin-facing surface of the absorbent core 40 may be covered with a liquid-permeable core wrap sheet. Furthermore, the absorbent body 4 does not necessarily have to include a core wrap sheet.

[0017] In this embodiment, a pair of leak-proof cuffs 6, 6 are provided on both sides of the skin-facing side of the absorbent body 5, along the longitudinal direction X, and are made of a leak-proof cuff forming sheet 60 that is liquid-resistant or water-repellent and breathable. One or more thread-like leak-proof cuff elastic members 61 are fixed to the free end of each leak-proof cuff 6 so as to be stretchable in the longitudinal direction X. When the elastic members 61 contract, the leak-proof cuff 6 stands upright on the skin side of the wearer at least in the crotch area C, thereby preventing the outward leakage of bodily fluids in the lateral direction Y.

[0018] The outer casing 3 forms the outer shape of the diaper 1, that is, the outer shape of the ventral part A, the crotch area C, and the dorsal part B. As shown in Figures 1 and 2, in a plan view when unfolded and extended, the outer casing 3 has a rectangular shape in the ventral part A and dorsal part B, where the length in the lateral direction Y is longer than the length in the longitudinal direction X, and in the crotch area C, both side edges along the longitudinal direction X, that is, a pair of leg edges LE, LE, are hourglass-shaped, tapering inward in the lateral direction Y. In this embodiment, in a plan view when unfolded and extended, both side edges along the longitudinal direction X of the ventral part A and dorsal part B protrude outward in the lateral direction Y than both side edges along the longitudinal direction X of the crotch area C. Furthermore, the longitudinal ends WE of the ventral part A and the longitudinal ends WE of the dorsal part B of the outer casing 3 extend in the lateral direction Y, forming a waist opening in the diaper 1 where the side seal portion is formed. In other words, these vertical edges WE become the peripheral edges WE of the waist opening, which also become the vertical edges WE of diaper 1.

[0019] The outer casing 3 is constructed by laminating multiple sheet materials. In this embodiment, as shown in Figure 2, the outer casing 3 has an outer layer sheet 31 and an inner layer sheet 33 laminated in this order from the non-skin-facing side to the skin-facing side. The outer layer sheet 31 forms the outer surface, i.e., the non-skin-facing side, of the diaper 1 at least in the ventral A and dorsal B portions, and as shown in Figure 2, it is divided into a front outer layer sheet 31a located on the front body F and a rear outer layer sheet 31b located on the back body R. The inner layer sheet 33 is located on the skin-facing side of the outer layer sheet 31 and is fixed across both the outer layer sheets 31a and 31b of the front body F and back body R. In this embodiment, the inner layer sheet 33 is continuous in the vertical direction X from the peripheral edge WE of the waist opening of the ventral A portion to the peripheral edge WE of the waist opening of the dorsal B portion. In other words, the inner layer sheet 33 is continuous along the entire length of the diaper 1, and the front outer layer sheet 31a and the rear outer layer sheet 31b in the longitudinal direction X form the outer surface of the diaper 1. These sheets 31 and 33 that constitute the outer casing 3 are joined together by known bonding means such as adhesives.

[0020] In this embodiment, the outer layer sheet 31a, 31b of the outer layer sheet 31a, 31b is folded back towards the skin-facing side along the peripheral edge WE of the waist opening (see Figure 2). That is, the outer layer sheets 31a, 31b form the peripheral edge WE of the waist opening, and the folded portion of the sheets 31a, 31b extends inward in the vertical direction X from the peripheral edge WE. In this embodiment, the inner layer sheet 33 of the outer layer body 3 is also folded back along the peripheral edge WE of the waist opening toward the skin-facing surface, similar to the outer layer sheets 31a and 31b described above. Near the peripheral edge WE of the waist opening of the outer layer body 3, the folded portion of the outer layer sheets 31a and 31b and the folded portion of the inner layer sheet 33 overlap toward the skin-facing surface. The outer casing 3 of this embodiment has end fixing sheets 34, 34 that cover the skin-facing surfaces at both ends of the absorbent body 5 in the longitudinal direction X, and the end fixing sheets 34 are joined to the outer casing 3 and the absorbent body 5 by known bonding means such as adhesive (see Figure 2). In this embodiment, the sheet material constituting the exterior body 3 includes an outer layer sheet 31, an inner layer sheet 33, an end fixing sheet 34, a folded portion of the inner layer sheet 33, and a folded portion of the outer layer sheet 31. The sheet material constituting the outer casing 3 may be positioned on the non-skin-facing side of the absorbent 4 (absorbent body 5) in the portion where it overlaps with the absorbent 4.

[0021] In the ventral portion A and the dorsal portion B, in the area around the wearer's torso, multiple elastic members 32 are intermittently arranged in a state of being stretched in the lateral direction Y and at predetermined intervals in the vertical direction X. Specifically, the elastic members 32 consist of multiple waist elastic members 32, which are extended in the lateral direction Y and intermittently arranged at predetermined intervals in the longitudinal direction X, in the waist region D of the ventral portion A and the dorsal portion B, respectively. The waist region D is located outward in the longitudinal direction X from the longitudinal end 4E, which is the outermost end of the absorber 4 in the longitudinal direction X (see Figure 3). The waist region D is located between one side seal portion and the other side seal portion. The waist region D is the area where the absorber 4 is not located. The waist elastic member 32 is positioned between the two side edges of the ventral portion A and the dorsal portion B, respectively, along the longitudinal direction X. The waist elastic member 32 extends over substantially the entire length in the lateral direction Y of both the ventral portion A and the dorsal portion B of the outer body 3, and is positioned in a state in which elastic stretchability is exhibited. In this embodiment, the waist elastic member 32 is positioned around and near the wearer's waist when worn. This forms a substantially continuous annular waist gather along the entire circumference of the waist opening. In this embodiment, the waist elastic member 32 is fixed in an extended state, sandwiched between the folded portion of the inner layer sheet 33. The waist elastic member 32 may be arranged over the entire waist region D in the vertical direction X, or it may be arranged only around the wearer's waist when worn. For example, it may be arranged only in the first high-strength portion 16, which will be described later.

[0022] The outer casing 3 is equipped with a plurality of thread-like or strip-like leg elastic members 37 arranged in an extended state on the skin-facing side of the inner layer sheet 33. Specifically, one or more leg elastic members 37 for forming leg gathers are arranged in an extended state on the leg edge portion LE that forms the periphery of each of the pair of leg openings in the front body F (see Figure 1). As a result, leg gathers are formed on the periphery of each of the pair of leg openings in the front body F. In this embodiment, the diaper 1 has leg elastic members 37 only on the front panel F. That is, the back panel R does not have leg elastic members 37. With this configuration, the leg opening on the front panel F side is in a contracted state, and the leg opening on the back panel R side is in a non-contracted state, making the leg openings easier to see, which in turn makes it easier for the wearer to put their legs through the leg openings, thus making it easier to put on the diaper 1.

[0023] One of the main features of diaper 1 is that, as shown in Figure 3, the outer body 3 has, at least in the waist region D of the ventral part A, a first low-strength portion 15 and first and second high-strength portions 16 and 17 located on both sides of the first low-strength portion 15 in the longitudinal direction X, with the tensile strength in the longitudinal direction X being higher than that of the first low-strength portion 15. The first high-strength portion 16 includes the longitudinal end WE of the outer body 3 that forms the waist opening, and the second high-strength portion 17 is located further inward in the longitudinal direction X (closer to the crotch area C) than the first low-strength portion 15. The tensile strength in the longitudinal direction X is measured by the following method.

[0024] <Method for measuring tensile strength> Tensile strength can be measured by tensile testing using a tensile testing machine (for example, Shimadzu Corporation, model "AUTOGRAPH AG-X"). Specifically, a measurement sample with a length of 50 mm in the transverse direction Y of diaper 1 is cut from the waist region D of the ventral side A. The measurement sample consists of the first high-strength section 16, the first low-strength section 15, the second high-strength section 17, and the second low-strength section 18 located in the longitudinal direction X of diaper 1, and if the second low-strength section 18 is included, the second low-strength section 18 is also included. The measurement target area (first high-strength section 16, first low-strength section 15, second high-strength section 17, or second low-strength section 18) of the measurement sample is clamped and fixed at both ends in the longitudinal direction X by a pair of chucks on a tensile testing machine. The distance between the chucks is set to 15 mm, and the area located between the chucks (initial length 15 mm) is pulled in the longitudinal direction X at a tensile speed of 1000 mm / min, and the maximum load at fracture is measured. A 1 kN load cell is used to measure the load. For each measurement target area, five measurement samples are prepared, and the maximum load of each is measured. The arithmetic mean of these samples is taken as the tensile strength (N / 50mm) in the longitudinal direction X of the measurement target area. If it is not possible to cut out a 50mm length sample from diaper 1 for measurement, the tensile strength value measured in the same manner for a sample shorter than 50mm will be converted to a value per 50mm width. For example, if the width of the measurement sample is 30mm, the measured tensile strength will be divided by 30 and then multiplied by 50 to obtain the converted value. If the length in the vertical direction X of the first high-strength section 16, the first low-strength section 15, or the second high-strength section 17 is less than 15 mm, the maximum possible length that is common to all sections is measured as the initial length.

[0025] Furthermore, when measuring physical properties such as tensile strength by removing a portion of a panty-type absorbent article, if the component to be removed (measurement sample) is joined to other components by adhesive, the adhesive force should be removed from the joint by methods such as blowing cold air from a cold spray before removal. This procedure is common to all measurements in this specification.

[0026] As described above, the outer casing 3 of this embodiment has, at least in the waist region D of the ventral portion A, a first low-strength portion 15 with relatively low tensile strength in the longitudinal direction X, and first and second high-strength portions located on both sides of the first low-strength portion 15 in the longitudinal direction X. By providing such a difference in tensile strength in the longitudinal direction X within the waist region D, the first low-strength portion 15 becomes more easily deformed than the high-strength portions 16 and 17. As a result, when wearing the diaper 1, if the wearer presses the first low-strength portion 15 with their fingers from the skin-facing side toward the non-skin-facing side, the first low-strength portion 15 deforms to protrude outward from the diaper 1, forming a pocket shape. This pocket shape is suitable for making it easier to put fingers into the diaper 1. As a result, when wearing the diaper 1, it becomes easier to put fingers into the first low-strength portion 15, making it easier to widen the waist opening.

[0027] Furthermore, the second high-strength portion 17 is located adjacent to the first low-strength portion 15 in the longitudinal direction X (towards the crotch area C). This effectively prevents the diaper 1 from unintentionally tearing when the wearer's fingernail touches the area adjacent to the first low-strength portion 15 when they place their finger on it. Furthermore, the first high-strength portion 16 is located adjacent to the first low-strength portion 15, further outward in the vertical X direction (towards the peripheral edge WE of the waist opening). This effectively prevents the diaper 1 from unintentionally tearing, even if a force pulling the diaper 1 towards the wearer's crotch is applied to the first high-strength portion 16 during the pulling operation when putting on the diaper 1. Thus, with the diaper 1 of this embodiment, when putting it on, there is a part where fingers can easily get caught, making it easier to widen the waist opening, and it is less likely to tear due to fingers.

[0028] From the viewpoint of more reliably achieving the effects of the present invention, the ratio of the tensile strength in the longitudinal direction X of the first high-strength portion 16 and the second high-strength portion 17 to the tensile strength in the longitudinal direction X of the first low-strength portion 15 is preferably 1.2 or more and 3.0 or less, and more preferably 1.5 or more and 2.5 or less, as former / latter.

[0029] From the viewpoint of making it easier to widen the waist opening when wearing diaper 1, the tensile strength of the first low-strength portion 15 in the longitudinal direction X is preferably 30N / 50mm or more and 180N / 50mm or less, more preferably 30N / 50mm or more and 100N / 50mm or less. In order to more effectively prevent unintended tearing of diaper 1 during the pulling operation when putting on diaper 1, the tensile strength in the longitudinal direction X of the first high-strength portion 16 is preferably 50N / 50mm or more and 180N / 50mm or less, more preferably 80N / 50mm or more and 180N / 50mm or more, and the tensile strength in the longitudinal direction X of the second high-strength portion 17 is preferably 50N / 50mm or more and 180N / 50mm or less, more preferably 80N / 50mm or more and 160N / 50mm or more.

[0030] The tensile strength of the first high-strength section 16 in the longitudinal direction X may be the same as or different from that of the second high-strength section 17. If the tensile strengths of the first high-strength section 16 and the second high-strength section 17 are different in the longitudinal direction X, the tensile strength of the first high-strength section 16 in the longitudinal direction X may be higher or lower than that of the second high-strength section 17. From the viewpoint of more effectively preventing unintended tearing of the diaper 1, it is preferable that the tensile strength of the first high-strength section 16 in the longitudinal direction X is higher than that of the second high-strength section 17. In other words, at least in the ventral section A, it is preferable that the relationship of magnitude "first high-strength section 16 > second high-strength section 17 > first low-strength section 15" holds true with respect to the tensile strength in the longitudinal direction X. The ratio of the tensile strength of the first high-strength portion 16 in the longitudinal direction X to the tensile strength of the second high-strength portion 17 in the longitudinal direction X is preferably 1.1 or more and 2.0 or less, and more preferably 1.3 or more and 1.8 or less, as former / latter.

[0031] From the viewpoint of ensuring that the effects of the present invention are achieved more reliably, it is preferable that the length of the first high-strength portion 16 in the vertical direction X is greater than 0% and 20% or less of the total length of the side edge portion AS in the vertical direction X, the length of the first low-strength portion 15 in the vertical direction X is greater than 0% and 10% or less of the total length of the side edge portion AS in the vertical direction X, and the length of the second high-strength portion 17 in the vertical direction X is greater than 0% and 20% or less of the total length of the side edge portion AS in the vertical direction X. The length of the first high-strength portion 16 in the vertical direction X is preferably 5 mm to 40 mm, more preferably 10 mm to 30 mm. The length of the first low-strength portion 15 in the vertical direction X is preferably 10 mm or more and 50 mm or less, more preferably 20 mm or more and 40 mm or less. The length of the second high-strength portion 17 in the vertical direction X is preferably 10 mm or more and 50 mm or less, more preferably 20 mm or more and 40 mm or less.

[0032] From the viewpoint that the higher the basis weight of the outer body 3, the less likely it is that a deformed portion of the outer body 3, such as the pocket shape, will form, and the lower the basis weight of the outer body 3, the more likely it is that such a deformed portion will form, it is preferable that the basis weight of the first high-strength portion 16 and the second high-strength portion 17 is higher than that of the first low-strength portion 15, and it is even more preferable that the portion with the lowest basis weight in the waist region D is the first low-strength portion 15. This makes it possible to further inhibit the formation of the pocket shape in the first high-strength portion 16 and the second high-strength portion 17, and to selectively make it easier to form the pocket shape only in the first low-strength portion 15. Moreover, because the basis weight of the first high-strength portion 16 and the second high-strength portion 17 is high, it is possible to more effectively prevent unintended tearing of the diaper 1 during the pulling operation when wearing it.

[0033] The ratio of the basis weight of the first high-strength section 16 and the second high-strength section 17 to the basis weight of the first low-strength section 15 is preferably 1.1 to 2.0, and more preferably 1.2 to 1.6, as former / latter. The basis weight of the first high-strength section 16 is preferably 50 g / m². 2 More than 150g / m 2Hereinafter, more preferably 70 g / m 2 or more and 120 g / m 2 or less. The basis weight of the first low-strength portion 15 is preferably 20 g / m 2 or more and 100 g / m 2 or less, more preferably 40 g / m 2 or more and 70 g / m 2 or less. The basis weight of the second high-strength portion 17 is preferably 50 g / m 2 or more and 150 g / m 2 or less, more preferably 60 g / m 2 or more and 110 g / m 2 or less. The basis weight can be measured, for example, by the following method. <Method for Measuring Basis Weight> From the measurement target site (the first high-strength portion 16, the first low-strength portion 15, the second high-strength portion 17 or the second low-strength portion 18), a rectangular sample piece is cut out with the longitudinal direction X as the short side direction and the transverse direction Y as the long side direction. The sample piece cuts out the entire thickness direction of the waist region. When the elastic member 32 and the elastic filaments described later are included, they are removed. Then, the mass of the sample piece is measured. The mass of the measured sample piece converted to the mass per 1 m 2 area is taken as the basis weight of each measurement target site.

[0034] In the above measurement method, when the sample piece includes the stretchable sheet described later, as an example of the method for removing the elastic filaments from the stretchable sheet, a method using an organic solvent in which the fiber sheet constituting the stretchable sheet is insoluble and the elastic filaments are soluble can be mentioned. Specifically, a method of immersing the stretchable sheet in the organic solvent to dissolve the elastic filaments with the organic solvent and then drying the fiber sheet can be mentioned. For example, when the elastic filaments are made of a styrene-based block copolymer of a thermoplastic elastomer and the fiber sheet constituting the stretchable sheet is made of polypropylene, toluene can be used as the organic solvent.

[0035] From the viewpoint that the more layers of sheet material the exterior body 3 has, the less likely it is that a deformed portion of the exterior body 3, such as the pocket shape, will form, and the fewer layers of sheet material the exterior body 3 has, the more likely it is that such a deformed portion will form, it is preferable that the number of layers of sheet material constituting the first high-strength portion 16 and the second high-strength portion 17 is greater than the number of layers of sheet material constituting the first low-strength portion 15, and it is even more preferable that the portion with the fewest layers of sheet material in the waist region D is the first low-strength portion 15. In this embodiment, as shown in Figure 3, the number of laminated sheets constituting the first high-strength portion 16 in the ventral portion A is a four-layer structure consisting of an outer layer sheet 31, an inner layer sheet 33, a folded portion 31A of the outer layer sheet, and a folded portion 33A of the inner layer sheet. The sheet material constituting the second high-strength section 17 has a four-layer structure consisting of an outer layer sheet 31, an inner layer sheet 33, a folded portion 33A of the inner layer sheet, and an end fixing sheet 34. The sheet material constituting the first low-strength section 15 has a three-layer structure consisting of an outer layer sheet 31, an inner layer sheet 33, and a folded portion 33A of the inner layer sheet. In this way, by increasing the number of layers of sheet material constituting the first high-strength section 16 and the second high-strength section 17 compared to the number of layers of sheet material constituting the first low-strength section 15, it becomes easier to selectively form the pocket shape only in the low-strength section 15. As a result, it becomes easier to grip the first low-strength section 15, making it easier to widen the waist opening. Furthermore, by increasing the number of layers of sheet material constituting the first high-strength section 16 and the second high-strength section 17, it becomes possible to more effectively prevent unintended tearing of the diaper 1 during the pulling operation when putting it on.

[0036] Moreover, as shown in Figure 3, in the waist region D, the outer layer sheet 31 and the inner layer sheet 33 are folded back towards the skin-facing side along the peripheral edge WE of the waist opening (hereinafter also referred to as the "folded structure"), and the outer layer sheet 31, inner layer sheet 33, end fixing sheet 34, folded portion 33A of the inner layer sheet, and folded portion 31A of the outer layer sheet are laminated in this order from the non-skin-facing side to the skin-facing side. One or more of the following (A) to (F) can be cited as advantages of having such a configuration. (A) Since the outer casing 3 has a folded structure, when a hand is placed into the waist opening of the diaper 1, fingers can get caught and prevent the folded portion 33A of the inner layer sheet and the folded portion 31A of the outer layer sheet from being turned over, and the reduction in strength of the outer casing 3 due to such turning over can be suppressed. (B) The folded structure prevents the waist or legs from getting caught in the waist opening when putting on diaper 1, thus allowing the series of operations when putting on diaper 1 to be performed smoothly. (C) The sheet 33A that constitutes the skin-facing side of the first low-strength section 15 is also included in the first high-strength section 16, and in the first high-strength section 16, sheet 31A is laminated on the skin-facing side of sheet 33A, so that when fingers are inserted into the waist opening, the thumb can easily fit smoothly into the first low-strength section 15. (D) In ​​the waist region D of the ventral part A, the part with the fewest number of laminated sheets of the sheet material is the first low-strength part 15, or the part with the lowest basis weight is the first low-strength part 15. Therefore, the easiest part to spread out in the waist region D is the first low-strength part 15, and it becomes even easier to spread out by placing your fingers on the first low-strength part 15.

[0037] (E) Increasing the amount of sheet material to ensure tensile strength in the longitudinal direction X may lead to a deterioration in wearing comfort. However, by using the end fixing sheet 34 that covers the end of the absorbent body 4 as one of the layers of the second high-strength section 17, the discomfort caused by the thickness of the absorbent body 4 can be reduced, thereby improving wearing comfort. (F) By using a minimum number of components, such as the outer layer sheet 31, the inner layer sheet 33, and the end fixing sheet 34, and making full use of folding and length extension, it is possible to ensure tensile strength in the longitudinal direction X, thereby suppressing concerns that may arise when adding another sheet to improve tensile strength, such as the sheet edges getting caught and becoming difficult to pull out, or the sheet edges peeling off and reducing strength.

[0038] From the viewpoint of making it easier to form the deformed portion of the outer body 3, such as the pocket shape, it is preferable that the tensile stress in the lateral direction Y of the first high-strength portion 16 is greater than the tensile stress in the lateral direction Y of the first low-strength portion 15, and it is even more preferable that the tensile stress in the lateral direction Y of the first high-strength portion 16 and the second high-strength portion 17 is greater than the tensile stress in the lateral direction Y of the first low-strength portion 15. The higher the tensile stress, the stronger the resistance to the force that expands the diaper 1 when it is put on, so that the formation of the pocket shape in the first low-strength portion 15 becomes more certain, and the inconvenience of the pocket shape being formed in parts other than the first low-strength portion 15 can be prevented.

[0039] The ratio of the tensile stress in the lateral direction Y of the first high-strength portion 16 to the tensile stress in the lateral direction Y of the first low-strength portion 15 is preferably 1.1 or more and 2.5 or less, and more preferably 1.2 or more and 2.0 or less, as former / latter. The tensile stress in the lateral direction Y of the first high-strength section 16 is preferably 1 N / 50 mm or more and 5 N / 50 mm or less, and preferably 1.5 N / 50 mm or more and 3 N / 50 mm or less. The tensile stress in the lateral direction Y of the first low-strength portion 15 is preferably 1 N / 50 mm or more and 3 N / 50 mm or less, and preferably 1 N / 50 mm or more and 2.5 N / 50 mm or less. The tensile stress in the lateral direction Y of the second high-strength section 17 is preferably 1N / 50mm or more and 4N / 50mm or less, and preferably 1N / 50mm or more and 3N / 50mm or less. Tensile stress can be measured, for example, by the following method.

[0040] <Method for measuring tensile stress> First, the outer casings 3, which are joined at the side seals, are separated, and the diaper 1 is unfolded and spread flat. Along a straight line parallel to the horizontal direction Y of the diaper 1, rectangular measurement samples are cut from each of the measurement target areas (low-strength parts 15, 18, high-strength parts 16, 17), with a length of 150 mm in the longitudinal direction along the horizontal direction Y and a length of 50 mm in the short direction along the vertical direction X. The ends of the measurement sample in the longitudinal direction (horizontal direction Y) are clamped in the chucks of a tensile testing machine ("Tensilon" RTC-1150A manufactured by Orientec Co., Ltd.), and the measurement sample is stretched in the longitudinal direction at a speed of 300 mm / min, and the stress (tensile stress) of the measurement sample at that time is measured. Specifically, the distance between the chucks is set to 100 mm, and the tensile load is measured when the sample piece is stretched in the longitudinal direction at a speed of 300 mm / min until the distance between the chucks becomes 150 mm. Such measurements were performed on five sample pieces, and the average of these measurements (the average tensile load when the distance between the chucks was extended to 150 mm) was defined as the tensile stress (N / 50 mm). If a measurement sample with a length of 50 mm in the short direction cannot be obtained, the tensile stress value measured using a measurement sample with a length of less than 50 mm in the short direction will be converted to a value per 50 mm width. Specifically, if the width of the measurement sample is 20 mm, the measured tensile stress will be divided by 20, and then multiplied by 50 to obtain the converted value.

[0041] The tensile stress in the lateral direction Y of the low-strength sections 15 and 18 and the high-strength sections 16 and 17 can be adjusted by appropriately adjusting the composition and arrangement of the constituent members of those sections, such as elastic members (elastic filaments) and sheets, in particular members that contribute to the development of lateral Y-flexibility (hereinafter also referred to as "stretchable members"). If the stretchable members include elastic members, the tensile stress in the lateral Y of those sections can be adjusted by appropriately adjusting the number, thickness, pitch, etc. of the elastic members.

[0042] From the viewpoint of preventing localized tearing by uniformly distributing force when force is applied to spread the absorbent material during wear, from the viewpoint of ensuring that the diaper 1 fits the body when worn and gives the appearance of underwear, and from the viewpoint of forming uniform folds in the absorbent material so that it acts as a cushioning material when fingers are inserted, further suppressing tearing and improving the wearing comfort, it is preferable that the outer body 3 includes an elastic sheet that stretches in the lateral direction Y, at least in the waist region D of the ventral part A. The aforementioned stretchable sheet has a higher maximum elongation and stretch recovery rate in the lateral direction Y than in the longitudinal direction X. More specifically, the stretchable sheet preferably has a maximum elongation of 50% or more and a stretch recovery rate of 70% or more in the lateral direction Y, and shrinks after stretching, but does not shrink after stretching in the longitudinal direction X. The stretch recovery rate of the sheet is measured by the following measurement method.

[0043] <Method for measuring elongation recovery rate> A sample piece measuring 50 mm in length and 25 mm in width is cut from the sheet to be measured (stretchable sheet) so that the longitudinal direction of the sample and the direction of extension of the elastic filaments coincide. The sample piece is fixed in a non-stretched and taut state between the chucks (chuck spacing K0) of a tensile testing machine ("Tensilon" RTC-1150A, manufactured by Orientec Co., Ltd.), and the sample piece is pulled by widening the chuck spacing at a tensile speed of 300 mm / min until it reaches the length K2 (= K0 × 2) of 100% elongation. Then, the chuck spacing is narrowed at the same speed as the tensile speed, and the length of the sample piece when the tensile stress becomes 0 is defined as the length K1 after elongation recovery. The elongation recovery rate of the sheet to be measured at 100% elongation is calculated using the following formula. Elongation recovery rate (%) at 100% elongation = [(K2-K1) / (K2-K0)] × 100

[0044] Preferably, the stretchable sheet may be (1) a stretchable nonwoven fabric in which an elastic fiber layer is integrated on both or one side of an elastic fiber layer, (2) a stretchable nonwoven fabric in which an elastic fiber layer is integrated on both or one side of a net-like elastic sheet, (3) a stretchable nonwoven fabric in which an elastic fiber layer is integrated on both or one side of an elastic sheet made of an elastic film, or (4) a stretchable nonwoven fabric in which a large number of elastic filaments arranged to extend in one direction without intersecting each other are bonded to an elastic fiber layer over their entire length in a substantially unstretched state. The term "stretchable fiber layer" as used herein includes not only fiber layers that are stretchable before integration with an elastic material, but also fiber layers that have been made stretchable by machining or other means after integration with an elastic material. Methods for integrating an elastic fiber layer with an extendable fiber layer include, for example, laminating them and entangling the fibers by water flow entanglement or air passage, or joining them by heat embossing, adhesive, or ultrasound. Elastic fibers can be made from thermoplastic elastomers such as styrene elastomers, polyolefin elastomers, polyester elastomers, or polyurethane elastomers, or from elastic resins such as rubber. Non-elastic fibers can be made from thermoplastic resins.

[0045] The stretchable nonwoven fabric described in (4) above includes, for example, a fabric having a structure in which thread-like elastic filaments are sandwiched between stretchable fiber layers mainly composed of inelastic fibers, thereby integrating them. Such a stretchable nonwoven fabric is composed of two fiber sheets as fiber layers and elastic filaments interposed between these two sheets. This stretchable nonwoven fabric can be manufactured, for example, according to the method described in Japanese Patent Application Publication No. 2009-61743.

[0046] In the stretchable nonwoven fabric described in (4) above, both fiber sheets are stretchable. These two fiber sheets are stretchable in the same direction as the stretching direction of the elastic filaments. The stretchable form includes (a) a form in which the constituent fibers of the sheet itself stretch, and (b) a form in which, even if the constituent fibers themselves do not stretch, the sheet as a whole stretches due to mechanical processing, etc., causing fibers that were bonded at intersections to separate, or due to bonding between fibers, etc., causing a structural change in the three-dimensional structure formed by multiple fibers, or due to the tearing of constituent fibers. Examples of mechanical processing in (b) above include heat treatment, stretching between rolls, stretching by jamming with tooth grooves or gears, and tensile stretching with a tenter.

[0047] In the stretchable nonwoven fabric described in (4) above, the elastic filaments can be formed by stretching an elastic resin in a melted or softened state. Multiple elastic filaments are arranged continuously in one direction and are positioned to extend in that direction without intersecting each other. The elastic filaments are joined to two fiber sheets in a substantially non-stretched state. This joining is achieved by fusing the constituent fibers (non-elastic fibers) of the two fiber sheets to the elastic filaments while they are embedded within the elastic filaments, and is not done using an adhesive such as a hot-melt adhesive. Therefore, there is no adhesive between the two fiber sheets (stretchable fiber layers mainly composed of non-elastic fibers) and the elastic filaments joined thereto.

[0048] The two fiber sheets constituting the stretchable nonwoven fabric described in (4) above can each be various types of nonwoven fabrics, such as air-through nonwoven fabric, heat-rolled nonwoven fabric, spunlace nonwoven fabric, spunbond nonwoven fabric, or meltblown nonwoven fabric. The two fiber sheets may be of the same type or different types. Here, "sheets of the same type" means sheets in which the manufacturing process, the type of constituent fibers, the fiber diameter and length of the constituent fibers, the thickness and basis weight of the sheets, etc., are all the same. If at least one of these is different, they are "different types of sheets." The elastic filament is made from materials such as thermoplastic elastomer or rubber. In particular, when thermoplastic elastomer is used as a raw material, melt spinning using an extruder is possible, similar to ordinary thermoplastic resins, and the elastic filament obtained in this way is easy to heat-seal, making it suitable for stretchable nonwoven fabrics.

[0049] In this embodiment, of the multiple sheets 31, 33 constituting the outer casing 3, it is preferable that the outer layer sheet 31 is formed of the stretchable nonwoven fabric described in (4) above. In this case, the stretchable nonwoven fabric forming the outer layer sheet 31 has elastic filaments that extend in the direction of the transverse Y. The outer layer sheet 31 may also include sheets other than the stretchable nonwoven fabric, provided that the entire sheet is stretchable in the transverse Y direction.

[0050] In this embodiment, the inner layer sheet 33 is not stretchable and is made of a non-stretchable sheet. A non-stretchable sheet is a sheet that is substantially non-stretchable in a certain direction. In this embodiment, it is preferably a sheet that is non-stretchable in at least the transverse direction Y, and preferably a sheet that is non-stretchable in both the longitudinal direction X and the transverse direction Y. A non-stretchable sheet means that even if a tensile force is applied to the sheet in that certain direction, the sheet hardly stretches. For example, if a sheet sample with a length of 15 cm and a width of 5 cm is pulled in the longitudinal direction of the sample using a material tensile tester such as Tensilon, and the elongation at break when the sample breaks is 10% or less, then the sample is substantially non-stretchable in the longitudinal direction. This elongation at break can be calculated as (length of the sample at break - original length of the sample) / (original length of the sample) × 100.

[0051] Preferably, the outer casing 3 is positioned inward in the vertical direction X from the second high-strength portion 17 and adjacent to the second high-strength portion 17 in the waist region D, and has a second low-strength portion 18 whose tensile strength in the vertical direction X is lower than that of the first and second high-strength portions 16 and 17. By having the second low-strength portion 18 in the outer casing 3, when the diaper 1 is worn, the feel against the skin near the absorbent body 5 is improved, and the flexibility and fit are also improved. From the viewpoint of more reliably achieving such effects, it is preferable that the ratio of the tensile strength in the longitudinal direction X of the first high-strength section 16 or the second high-strength section 17 to the tensile strength in the longitudinal direction X of the second low-strength section 18, and the tensile strength in the longitudinal direction X of the second low-strength section 18 are within the following ranges. The ratio of the tensile strength of the second low-strength portion 18 in the longitudinal direction X to the tensile strength of the first high-strength portion 16 and the second high-strength portion 17 in the longitudinal direction X is preferably 0.3 or more and 0.9 or less, and more preferably 0.4 or more and 0.7 or less, as former / latter. The tensile strength of the second low-strength portion 18 in the longitudinal direction X is preferably 30 N / 50 mm or more and 120 N / 50 mm or less, more preferably 30 N / 50 mm or more and 100 N / 50 mm or less.

[0052] From the viewpoint of improving the feel of the skin near the absorbent body 5 when wearing diaper 1, as well as improving flexibility and fit, it is preferable that the number of layers of sheet material constituting the second low-strength section 18 is less than the number of layers of sheet material constituting the first high-strength section 16 and the second high-strength section 17. In this embodiment, as shown in Figure 3, the number of laminated sheets constituting the second low-strength section 18 is a three-layer structure consisting of an outer layer sheet 31, an inner layer sheet 33, and an end-fixing sheet 34. On the other hand, as mentioned above, the number of laminated sheets constituting the first high-strength section 16 and the second high-strength section 17 is a four-layer structure.

[0053] From the viewpoint of improving the feel of the skin near the absorbent body 5 when wearing the diaper 1, as well as improving flexibility and fit, it is preferable that the basis weight of the second low-strength portion 18 is lower than that of the first high-strength portion 16 and the second high-strength portion 17. The ratio of the basis weight of the first high-strength section 16 and the second high-strength section 17 to the basis weight of the second low-strength section 18 is preferably 1.1 to 2.0, and more preferably 1.2 to 1.6, as former / latter. The basis weight of the second low-strength section 18 is preferably 20 g / m². 2 More than 100g / m 2 More preferably 40 g / m 2 More than 70g / m 2 The following applies:

[0054] When diaper 1 has a second low-strength portion 18, from the viewpoint of more reliably achieving the effects of the present invention, it is preferable that the length of the first high-strength portion 16 in the vertical direction X is greater than 0% and 40% or less of the total length of the waist region D in the vertical direction X, the length of the first low-strength portion 15 in the vertical direction X is greater than 0% and 10% or less of the total length of the waist region D in the vertical direction X, the length of the second high-strength portion 17 in the vertical direction X is greater than 0% and 30% or less of the total length of the waist region D in the vertical direction X, and the length of the second low-strength portion 18 in the vertical direction X is greater than 0% and 20% or less of the total length of the waist region D in the vertical direction X.

[0055] When diaper 1 has a second low-strength portion 18, it is preferable that the length of the high-strength portions 16, 17 and the low-strength portions 15, 18 in the vertical direction X is within the following range. The length of the first high-strength portion 16 in the vertical direction X is preferably 5 mm to 40 mm, more preferably 10 mm to 30 mm. The length of the first low-strength portion 15 in the vertical direction X is preferably 10 mm or more and 50 mm or less, more preferably 20 mm or more and 40 mm or less. The length of the second high-strength portion 17 in the vertical direction X is preferably 10 mm or more and 50 mm or less, more preferably 20 mm or more and 40 mm or less. The length of the second low-strength portion 18 in the vertical direction X is preferably 10 mm or more and 60 mm or less, more preferably 10 mm or more and 40 mm or less.

[0056] In this embodiment, the side seal portion is formed by heat-sealing the side edges AS and BS of the outer casing 3 along the longitudinal direction X in the ventral portion A and the dorsal portion B, respectively. As mentioned above, the outer casing 3 has portions with different numbers of laminated sheet material, so a difference in bonding strength occurs in the side seal portion due to the difference in the number of laminated sheets. Specifically, the bonding strength increases as the number of laminated sheet material increases, so the relationship "first high-strength portion 16, second high-strength portion 17 > first low-strength portion 15, second low-strength portion 18" holds true for the bonding strength of the side seal portion.

[0057] In the pulling operation when putting on diaper 1, from the viewpoint of preventing breakage at the side seal portion, it is preferable that the bonding strength of the side seal portion in the first high-strength portion 16 is highest in the waist region D. The bonding strength of the side seal portions of the high-strength portions 16, 17 and the low-strength portions 15, 18 is preferably within the following range. The bonding strength of the side seal portion in the first high-strength portion 16 is preferably 4N / 10mm or more and 25N / 10mm or less, more preferably 7N / 10mm or more and 25N / 10mm or less. The bonding strength of the side seal portion in the second high-strength portion 17 is preferably 4N / 10mm or more and 25N / 10mm or less, more preferably 7N / 10mm or more and 25N / 10mm or less. The bonding strength of the side seal portion in the first low-strength portion 15 is preferably 4N / 10mm or more and 22N / 10mm or less, more preferably 4N / 10mm or more and 20N / 10mm or less. The bonding strength of the side seal portion in the second low-strength portion 18 is preferably 4N / 10mm or more and 22N / 10mm or less, more preferably 4N / 10mm or more and 20N / 10mm or less. The joint strength can be measured, for example, by the following method.

[0058] <Method for measuring joint strength> From diaper 1, a strip-shaped measurement sample with a width of 10 mm is cut out, with the side seal located in the center of the longitudinal direction, and having a portion of the outer casing 3 on the front body F side and a portion of the outer casing 3 on the back body R side on either side. This measurement sample is fixed between the chucks of a tensile testing machine (for example, "Tensilon" RTC-1150A manufactured by Orientec Co., Ltd.). The test piece is then pulled longitudinally at a rate of expansion of the gap between the chucks of 300 mm / min until the outer casing 3 on the front body F side and the outer casing 3 on the back body R side are completely separated. The maximum tensile strength at that time is defined as the joint strength.

[0059] Next, the forming materials for each part of the diaper 1 will be described. As the inner layer sheet 33, various types of materials conventionally used as outer coverings in this type of absorbent article can be used without particular limitation. For example, as the inner layer sheet 33, nonwoven fabrics manufactured by various methods such as spunbond nonwoven fabric, air-through nonwoven fabric, and needle-punched nonwoven fabric can be used.

[0060] The elastic members 32, 37, and 61 of the leg elastic members are preferably made from stretchable materials such as natural rubber, polyurethane resin, foamed urethane resin, and hot-melt stretchable material, formed into thread-like (thread-like rubber) or strip-like (flat rubber) shapes. Various nonwoven fabrics and perforated films can be used as the surface sheet 12, and resin films or laminates of resin films and nonwoven fabrics can be used as the leak-proof sheet 13.

[0061] The absorbent core 40 of the absorbent body 4 is formed from core-forming materials such as hydrophilic fibers including pulp and cellulose, and water-absorbent polymers. The absorbent core 40 is composed of, for example, a stack of hydrophilic fibers, a mixed stack of hydrophilic fibers and water-absorbent polymers, a deposit of water-absorbent polymers, or a laminated structure in which water-absorbent polymers are supported between two absorbent sheets. For the core wrap sheet, for example, thin paper made of hydrophilic fibers or nonwoven fabric with liquid permeability can be used.

[0062] Although the present invention has been described above based on its preferred embodiments, the present invention is not limited in any way to the above embodiments and can be modified as appropriate without departing from the spirit of the invention. For example, in the above-described embodiment, the diaper 1 had the leg elastic member 37 only on the front panel F, but it may also have the leg elastic member 37 on both the front panel F and the back panel R. The outer casing 3 preferably has a first high-strength portion 16, a first low-strength portion 15, and a second high-strength portion 17 in this order on the dorsal portion B, similar to the ventral portion A, extending inward in the longitudinal direction X (crotch area C) from the longitudinal end WE of the diaper 1, and more preferably has a first high-strength portion 16, a first low-strength portion 15, a second high-strength portion 17, and a second low-strength portion 18 in this order. [Explanation of Symbols]

[0063] 1. Pant-type disposable diapers (diapers) 3. Exterior 4 Absorbent 5 Absorbent body 6 Leak proof cuff 10 Exterior 12 Surface sheet 13 Leak-proof sheet 15 1st low strength section 16 1st high strength section 17 2nd high strength section 18 2nd low strength section 31 Outer layer sheet 32 Elastic members 33 Inner layer sheet 34 End fixing sheet 60 Sheet for forming leak-proof cuff A. Ventral part B Dorsal part C Inseam D Waist area F Front R Back

Claims

1. A pant-type absorbent article comprising an abdominal portion positioned on the wearer's abdominal side, a dorsal portion positioned on the wearer's back, and a crotch portion located between the abdominal and dorsal portions, having an absorbent core having a longitudinal direction extending from the abdominal portion through the crotch portion to the dorsal portion and a transverse direction perpendicular to the longitudinal direction, and an outer casing constructed by laminating multiple sheet materials and fixing the absorbent core, having a waist opening and a pair of leg openings, In the ventral and dorsal portions, when the region located outside the longitudinal end of the absorbent is defined as the waist region, the outer casing has, at least in the waist region of the ventral portion, a first low-strength portion and first and second high-strength portions located on both sides of the first low-strength portion in the longitudinal direction, each having a longitudinal tensile strength higher than that of the first low-strength portion. The first high-strength portion includes the longitudinal end of the outer body forming the waist opening, and the second high-strength portion is located further inward in the longitudinal direction than the first low-strength portion, in a pant-type absorbent article.

2. The pant-type absorbent article according to claim 1, wherein the basis weight of the first high-strength portion and the second high-strength portion is higher than the basis weight of the first low-strength portion.

3. The pant-type absorbent article according to claim 1, wherein the number of layers of the sheet material constituting the first high-strength portion and the second high-strength portion is greater than the number of layers of the sheet material constituting the first low-strength portion.

4. The pant-type absorbent article according to claim 1, wherein the outer casing includes a stretchable sheet having transverse elasticity in at least the waist region on the ventral side.

5. The exterior body has a second low-strength portion in the waist region, which is positioned inward in the vertical direction from the second high-strength portion and adjacent to the second high-strength portion, and whose tensile strength is lower than that of the first and second high-strength portions. The pant-type absorbent article according to claim 1, wherein the number of laminated sheets of the sheet material constituting the second low-strength portion is less than the number of laminated sheets of the sheet material constituting the first high-strength portion and the second high-strength portion, or the basis weight of the second low-strength portion is lower than the basis weight of the first high-strength portion and the second high-strength portion.

6. The pant-type absorbent article according to claim 1, wherein the extrinsic stress in the lateral direction of the first high-strength portion is greater than the extrinsic stress in the lateral direction of the first low-strength portion.

7. The aforementioned pant-type absorbent article is divided into a front panel that is positioned on the wearer's abdominal side and a back panel that is positioned on the wearer's back, with the center in the vertical direction as the boundary. The pants-type absorbent article according to claim 1, wherein the leg elastic members for forming leg gathers are provided only on the front of the garment.

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