Trunks-type absorbent products

Abstract

To be able to prevent or suppress deterioration of feeling of wear in a leg cylinder part, in a worn condition in a trunks-type absorbent article.SOLUTION: A diaper 100 includes: cylindrically extended leg cylinder parts 182, 181 in the openings P2, P3 around the legs, with an absorber 150 arranged in a superimposed manner on a crotch part 120. The diaper is provided with a rubber thread 190 which extends from the outer part 181b of each one leg cylinder part 181 in a dorsal part 130 and a ventral part 110 to the inner part 181a, shifting to the crotch ;part 120 where the absorber 150 is superimposed, traversing the crotch part 120 in the width direction W, shifting to the inner part 182a of each of the other leg cylinder part 182 in the dorsal part 130 and the ventral part 110, and extending to the outer part 182b to be arranged in plurality with a prescribed space apart. The rubber thread 190 has a space s2 which is in a position with the largest in an oblique angle θ for the width direction W and which is larger than a space s3 in a part arranged by traversing the space s1 and the crotch part 120 in the outer part 181b in the width direction W.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a trunk-type absorbent article.

Background Art

[0002] A pant-type disposable diaper has a ventral part that mainly covers the lower abdomen on the ventral side, which is the front of the wearer (user), a crotch part that mainly covers the groin of the wearer, and a dorsal part that mainly covers the buttocks of the wearer, which are formed continuously in the length direction. Then, the side part in the width direction of the ventral part and the side part in the width direction of the dorsal part are joined, and the ventral part and the dorsal part are connected in the circumferential direction around the wearer's torso, forming a torso opening on the end side in the length direction, and forming two leg openings on both sides of the crotch part.

[0003] Also, a pant-type disposable diaper has a ventral part, a crotch part, and a dorsal part that are continuous, and the ventral part and the dorsal part are joined, and has an outer cover sheet formed in a pant shape as described above, and an absorber arranged on the inner surface side of the outer cover sheet, that is, on the side (skin surface side) that contacts the skin of the wearer, extending across the ventral part, the crotch part, and the dorsal part.

[0004] Here, as a form of a pant-type disposable diaper, a trunk-type diaper in which the length of the leg circumference is formed longer than normal is known. Such a trunk type may also be referred to as a one-piece pant type or a boxer pant type.

[0005] A trunk-type diaper has a leg cylinder part that extends in a cylindrical shape in the extending direction of the leg at the leg circumference, that is, at a portion corresponding to the root of the leg, and closely adheres to the root of the leg on the surface. This leg cylinder part is formed in a cylindrical shape by connecting the side parts of the ventral part and the dorsal part in the circumferential direction.

[0006] Trunks-type diapers have multiple elastic members, such as elastic threads, arranged at approximately equal intervals around the leg section to improve the fit against the wearer's legs. These elastic members are positioned in the unfolded state before the ventral and dorsal sections are joined together. Therefore, they are positioned separately on the ventral and dorsal sections of the leg section, and when the ventral and dorsal sections are joined together to form a tubular shape, the elastic members extend around approximately the entire circumference of the leg section.

[0007] Specifically, the elastic member extends from the left side of the leg tube for the left leg on the ventral side, along the circumferential direction of the leg tube to the inner thigh portion, traversing the crotch area where the absorber is located in the width direction, and extending from the inner thigh of the leg tube for the right leg on the ventral side, along the circumferential direction of the leg tube to the right side.

[0008] Similarly, on the back side of the wearer, the elastic member extends from the left side of the leg tube for the left leg on the back side, along the circumferential direction of the leg tube to the inner thigh, traversing the crotch area where the absorber is located in the width direction, and extending from the inner thigh of the leg tube for the right leg on the back side, along the circumferential direction of the leg tube to the right side (see, for example, Patent Documents 1, 2, and 3). [Prior art documents] [Patent Documents]

[0009] [Patent Document 1] Patent No. 6164084 [Patent Document 2] Japanese Patent Publication No. 2006-043125 [Patent Document 3] Patent No. 6359072 [Overview of the project] [Problems that the invention aims to solve]

[0010] As described above, the elastic members are fixed to the outer sheet in a significantly meandering manner in the inner thigh area where they transition from the left and right leg sections to the crotch area, resulting in a large inclination angle of the elastic threads relative to the width direction. In the section where the elastic threads are inclined relative to the width direction, the elastic force of the threads exerts an elastic force on the diaper toward the ends in the length direction. Therefore, in the inner thigh area when the diaper is worn, the spacing between the multiple elastic members, which are arranged at equal intervals, tends to be narrower compared to the outer part on the side seal side.

[0011] Furthermore, in the inner thigh area where the gap is narrower, the area of ​​the leg shaft where the elastic material acts becomes smaller compared to the outer area, resulting in increased compression from the elastic material and a decrease in wearing comfort.

[0012] This invention has been made in view of the above circumstances, and aims to provide a trunk-type absorbent article that can prevent or suppress a decrease in the comfort of the leg portion while being worn. [Means for solving the problem]

[0013] The present invention relates to a trunk-type absorbent article in which an abdominal portion, a crotch portion, and a dorsal portion are connected in the longitudinal direction, and a lateral portion in the width direction perpendicular to the longitudinal direction of the abdominal portion is connected to a lateral portion in the width direction of the dorsal portion, and a leg tube portion extending in a cylindrical shape in the direction of the extension of the leg is located at the leg opening, and an absorbent material is arranged on the inner surface of the crotch portion, wherein an inner portion extends from the outer portion of one of the leg tube portions of the dorsal portion and the abdominal portion along the circumferential direction of the one leg tube portion to the inner portion, and from the inner portion to the crotch portion in which the absorbent material is arranged on top of the absorbent material This is a trunk-type absorbent article having multiple elastic threads arranged at predetermined intervals, which transition, traverse the crotch area in the width direction, transition to the inner portion of the other leg tube of the dorsal and ventral sides, and extend from the inner portion along the circumferential direction of the other leg tube to the outer portion of the other leg tube, wherein the spacing of the elastic threads at the position where the angle of meandering inclination with respect to the width direction is greatest is set to be larger than the spacing in the outer portion and the spacing in the portion arranged traversing the crotch area in the width direction. [Effects of the Invention]

[0014] The trunk-type absorbent article according to the present invention can prevent or suppress a decrease in the comfort of the leg portion while being worn. [Brief explanation of the drawing]

[0015] [Figure 1] This is a perspective view showing a boxer shorts-style disposable diaper as it would appear when worn by a person. [Figure 2] This is a plan view showing the trunk-style disposable diaper shown in Figure 1 with both sides separated and opened to the front and back. [Figure 3] This is an enlarged view (part 1) showing the detailed arrangement of the elastic threads in the leg tube section for the right leg in Figure 2. [Figure 4] This is a magnified view (part 2) showing the detailed arrangement of the elastic threads in the leg tube section for the right leg in Figure 2. [Modes for carrying out the invention]

[0016] Embodiments of the trunk-type absorbent article according to the present invention will be described below with reference to the drawings.

[0017] [composition] <Overall Structure> Figure 1 is a perspective view showing a trunk-type disposable diaper 100 as it is assumed to be worn by a wearer 300, Figure 2 is a plan view showing the trunk-type disposable diaper 100 of Figure 1 with both sides separated and opened front and back, Figure 3 is an enlarged view (part 1) showing the details of the arrangement of the elastic thread 190 of the leg tube portion 181 for the right leg in Figure 2, and Figure 4 is an enlarged view (part 2) showing the details of the arrangement of the elastic thread 190 of the leg tube portion 181 for the right leg in Figure 2. The illustrated trunk-type disposable diaper 100 is one embodiment of the trunk-type absorbent article according to the present invention.

[0018] As shown in FIG. 1, the trunk-type disposable diaper 100 is formed such that the ventral part 110, the crotch part 120, and the dorsal part 130 are connected in the length direction L. The ventral part 110 corresponds to a part that mainly covers the lower abdomen on the front side of the wearer (user) 300 of the trunk-type disposable diaper 100. The crotch part 120 corresponds to a part that mainly covers the groin of the wearer 300. The dorsal part 130 corresponds to a part that mainly covers the buttocks of the wearer 300. In the plan view shown in FIG. 2, the direction orthogonal to the longitudinal direction (front-back direction) L is the width direction W. The width direction W corresponds to the circumferential direction of the wearer 300's torso when the diaper 100 is worn on the wearer 300.

[0019] Here, as shown in FIG. 1, the trunk-type disposable diaper 100 is formed such that the lengths of the left and right leg openings P2 and P3 are longer than those of a general pants-type diaper. The part of the length of the leg opening formed longer than that of the pants-type disposable diaper extends in a cylindrical shape in the extending direction of each leg of the wearer 300, and forms a leg cylinder part 181 that closely adheres to the root part of the right leg in a planar manner and a leg cylinder part 182 that closely adheres to the root part of the left leg in a planar manner.

[0020] The trunk-type disposable diaper 100 (hereinafter simply referred to as the diaper 100) is joined such that one side part 111 of the ventral part 110 in the width direction W and one side part 131 of the dorsal part 130 in the width direction W are joined, and the other side part 112 of the ventral part 110 in the width direction W and the other side part 132 of the dorsal part 130 in the width direction W are joined. As a result, as shown in FIG. 1, the diaper 100 has the ventral part 110 and the dorsal part 130 connected in the circumferential direction of the wearer 300's torso, forming a torso opening P1 at the end side in the length direction L of FIG. 2, and forming leg openings P2 and P3 on both sides of the crotch part 120.

[0021] Furthermore, the outer sheet 140 of the diaper 100 is positioned on the outer side (non-skin side) that is furthest from the wearer's skin in the thickness direction (directions perpendicular to the length direction L and the width direction W). The absorbent core 150 is positioned on the inner side (skin side) of the diaper 100 that is in contact with the wearer's skin in the thickness direction, superimposed on the outer sheet 140. In addition, a waist nonwoven fabric 170 is positioned on the waist on the skin side in the thickness direction, covering the entire width direction W of the ventral portion 110 and the dorsal portion 130. The waist nonwoven fabric 170 covers both ends of the absorbent core 150 in the length direction L from the skin side.

[0022] The absorbent body 150 is formed by sandwiching an absorbent material, which is made by entangling superabsorbent polymers (SAP) with pulp fibers, between a liquid-permeable sheet on the skin-facing surface and a liquid-impermeable sheet on the back surface that does not face the skin. As shown in Figure 2, the absorbent body 150 is arranged in the longitudinal direction L to cover approximately half the total length of the ventral portion 110, the total length of the crotch portion 120, and approximately half the total length of the dorsal portion 130.

[0023] As shown in Figure 2, the leg tube portion 181 for the right leg is formed along the leg opening P3, extending from the ventral portion 110 to the crotch portion 120 and the dorsal portion 130. The leg tube portion 182 for the left leg is also formed along the leg opening P2, extending from the ventral portion 110 to the crotch portion 120 and the dorsal portion 130.

[0024] The leg tube portion 181 for the right leg is formed into a cylindrical shape by joining the lateral portion 111 of the ventral portion 110 and the lateral portion 131 of the dorsal portion 130, connecting in the circumferential direction of the leg opening P3. At this time, the outer portion 181b of the leg tube portion 181, which is the end in the width direction W and corresponds to the lateral portions 111 and 131, is in close contact with the outside of the base of the right leg, and the inner portion 181a of the leg tube portion 181, which is closer to the center in the width direction W, is in close contact with the inside (inner thigh) of the base of the right leg.

[0025] The leg tube portion 182 for the left leg, like the leg tube portion 181 for the right leg, is formed into a cylindrical shape by joining the side portion 111 of the ventral portion 110 and the side portion 131 of the dorsal portion 130, connecting in the circumferential direction of the leg opening P2. At this time, the outer portion 182b of the leg tube portion 182, which is the end in the width direction W and corresponds to the side portions 112 and 132, is in close contact with the outside of the base of the left leg, and the inner portion 182a of the leg tube portion 182, which is closer to the center in the width direction W, is in close contact with the inside (inner thigh) of the base of the left leg.

[0026] <Placement of elastic thread> Furthermore, in order to improve the fit of the diaper 100 to each leg of the wearer 300, stretched elastic threads 190 are arranged so as to extend in the circumferential direction of the leg tubes 181 and 182. Multiple elastic threads 190 (for example, five in this embodiment) are distributed in the direction of the length of each leg tube 181 and 182, that is, at different distances from the edges of the leg openings P2 and P3. These elastic threads 190 are arranged separately on the ventral portion 110 and the dorsal portion 130 of the leg tubes 181 and 182 in the unfolded state before the ventral portion 110 and the dorsal portion 130 are joined together as shown in Figure 2.

[0027] Specifically, as shown in Figure 2, the elastic thread 190 corresponds to the front side of the wearer 300, extending from the outer portion 182b of the leg tube portion 182 for the left leg in the abdominal portion 110, along the circumferential direction of the leg tube portion 182 to the inner portion (the inner thigh portion of the left leg) 182a, then meandering from the inner portion 182a to the crotch portion 120 where the absorbent material 150 is placed in overlapping positions, traversing the crotch portion 120 in the width direction W, and then meandering from the crotch portion 120 where the absorbent material 150 is placed in overlapping positions to the inner portion (the inner thigh portion of the right leg) 181a of the leg tube portion 181 for the right leg in the abdominal portion 110, and finally extending from the inner portion 181a along the circumferential direction of the leg tube portion 181 to the outer portion 181b.

[0028] Similarly, on the back side of the wearer 300, the elastic thread 190 extends from the outer portion 182b of the left leg portion 182 on the back side 130 to the inner portion (the inner thigh portion of the left leg) 182a along the circumferential direction of the leg portion 182, then meanders from the inner portion 182a to the crotch portion 120 where the absorbent material 150 is arranged in overlapping positions, traverses the crotch portion 120 where the absorbent material 150 is arranged in overlapping positions in the width direction W, then meanders from the crotch portion 120 where the absorbent material 150 is arranged to the inner portion (the inner thigh portion of the right leg) 181a of the right leg portion 181 on the back side 130, and extends from the inner portion 181a to the outer portion 181b along the circumferential direction of the leg portion 181.

[0029] The arrangement of the elastic thread 190 described above is achieved in the manufacturing process of the diaper 100 by, for example, swinging a straight elastic thread 190 to stretch it within its elastic range and deform it into a meandering (curved) shape, and then fixing the elastic thread 190 to the outer sheet 140 in this deformed state.

[0030] Then, with the ventral portion 110 and the dorsal portion 130 joined together, and the leg tube portions 181 and 182 each formed into the cylindrical shape shown in Figure 1, the elastic threads 190 of the ventral portion 110 and the elastic threads 190 of the dorsal portion 130 extend almost the entire circumference of the leg tube portions 181 and 182, thereby improving the fit of each leg tube portion 181 and 182 to each leg of the wearer 300.

[0031] Furthermore, the elastic thread 190 extending across the left and right leg sections 181 and 182 is positioned across the crotch section 120 in the width direction W. Therefore, when the wearer 300 is standing and wearing the garment, the elastic thread 190 in the crotch section 120 supports the absorbent material 150 positioned in the crotch section 120 from below. Thus, the elastic thread 190 can also prevent or suppress the absorbent material 150, which has become heavy after absorbing urine and other excrement, from sagging downwards. In the crotch section 120 where the absorbent material 150 is stacked, both the elastic thread 190 extending from the back section 130 and the elastic thread 190 extending from the front section 110 are positioned.

[0032] In the diaper 100, multiple elastic threads 190 are positioned at different axial positions on the leg sections 181 and 182 of the leg tubes 181 and 182, respectively, both on the front and rear sides of the wearer 300. Specifically, in the example shown in Figures 1 and 2, the elastic threads 190 are positioned at five different distances from the edges of the leg openings P2 and P3 of the leg tubes 181 and 182, with five elastic threads 190 positioned on both the left and right leg tubes 181 and 182.

[0033] Figure 3 is a schematic diagram showing the arrangement of the elastic thread 190 mainly in the leg tube portion 181 of the dorsal portion 130, corresponding to the leg opening P3 for the right leg in Figure 2. The arrangement of the elastic thread 190 in the leg tube portion 181 of the ventral portion 110 corresponding to the leg opening P3 for the right leg, the arrangement of the elastic thread 190 in the leg tube portion 182 of the dorsal portion 130 corresponding to the leg opening P2 for the left leg, and the arrangement of the elastic thread 190 in the leg tube portion 182 of the ventral portion 110 corresponding to the leg opening P2 for the left leg are the same as the arrangement of the elastic thread 190 in the leg tube portion 181 of the ventral portion 110 corresponding to the leg opening P3 for the right leg, which are not shown in the diagram.

[0034] As shown in Figure 3, the five elastic threads 190 arranged on the leg tube portion 181 of the dorsal portion 130 are arranged at approximately equal intervals s1 in the outer portion 181b in the width direction W of the leg tube portion 181, and in the section from the outer portion 181b to the inner portion 181a in the width direction W, the spacing between the threads follows the circumferential direction of the leg tube portion 181, and gradually widens as it approaches the inner portion 181a.

[0035] Then, the elastic thread 190 has the largest angle θ of meandering inclination with respect to the reference line M parallel to the width direction W at the point where it transitions from the inner portion 181a to the crotch portion 120 where the absorbent material 150 is placed on top of it. The spacing s2 between the elastic threads 190 at the position where the angle θ of inclination with respect to the reference line M is largest is set to be larger than the spacing s1 in the outer portion 181b (s1 <s2)。

[0036] Furthermore, as the elastic thread 190 transitions from the inner portion 181a to the portion of the crotch 120 where the absorbent material 150 overlaps, the angle θ of the inclination of the elastic thread 190 with respect to the reference line M gradually decreases as it approaches the center of the width direction W, and near the center of the width direction W that crosses the crotch 120, it is set to be approximately parallel to the reference line M (angle θ ≈ 0). The spacing s2 between the elastic threads 190 at the position where the angle θ of the inclination of the elastic thread 190 with respect to the reference line M is largest is set to be larger than the spacing s3 of the elastic threads 190 in the portion that is approximately parallel to the reference line M and is arranged across the crotch 120 in the width direction W (s3 <s2)。

[0037] The intervals s1, s2, and s3 mentioned above are dimensions along the direction perpendicular to the direction in which the elastic thread 190 is stretched.

[0038] The arrangement of the elastic threads 190 described above is achieved, for example, by oscillating a straight elastic thread 190 to deform it into a meandering or curved shape, and then fixing it to the exterior sheet 140 in this deformed state.

[0039] [Effect] In the diaper 100 configured as described above, the elastic thread 190 is positioned so that in the inner portion 181a of the leg portion 181, it moves from the circumferential direction of the leg portion 181 to the crotch portion 120 other than the leg portion 181, that is, to the portion where the absorbent material 150 is overlapped. Therefore, in the inner portion 181a, the elastic force of the elastic thread 190 acts in the length direction of the leg portion 181.

[0040] Furthermore, the portion of the crotch area 120 where the absorbent material 150 is overlapped has higher rigidity than the leg tube portion 181. Therefore, the inner portion 181a of the leg tube portion 181 is pulled towards the absorbent material 150, and the area in which the inner portion 181a is in close contact with the inner thigh of the wearer 300 tends to become smaller.

[0041] Here, in the diaper to which the present invention is not applied, since the interval s2 between the thread rubbers 190 near the boundary that moves from the inner portion 181a to the overlapping crotch portion 120 of the absorber 150 is set to be the same as the interval s1 in the outer portion 181b (s1 = s2), the inner portion 181a of the leg cylinder portion 181 is likely to have a narrower interval between the thread rubbers 190 than the outer portion 181b. Therefore, the area of the surface of the leg cylinder portion 181 where the elastic forces of the five thread rubbers 190 act and that contacts the skin of the wearer 300 becomes narrower, and the surface pressure per unit area acting on that surface increases, leading to a decrease in the wearing comfort in the inner portion 181a.

[0042] However, in the diaper 100 of the present embodiment, as shown in FIG. 3, the interval s2 between the thread rubbers 190 at the portion with the maximum inclination angle that has moved from the inner portion 181a to the overlapping crotch portion 120 of the absorber 150 is larger than the interval s1 in the outer portion 181b (s1 < s2), and is larger than the interval s3 at the portion arranged across the crotch portion 120 in the width direction W (s3 < s2), and the thread rubbers 190 are arranged.

[0043] For this reason, even when the area of the inner portion 181a that adheres to the inner thigh of the wearer 300 becomes narrower, the area where the elastic forces of the five thread rubbers 190 in the inner portion 181a act in the state where the area has become narrower can be suppressed to be equivalent to the area where the elastic forces of the five thread rubbers 190 act in the outer portion 181b.

[0044] Therefore, the diaper 100 can prevent or suppress the surface pressure by the thread rubbers 190 in the inner portion 181a of the leg cylinder portion 181 from becoming higher than the surface pressure by the thread rubbers 190 in the outer portion 181b, and can prevent or suppress a decrease in the wearing comfort in the inner portion 181a of the leg cylinder portion 181 when the diaper is worn.

[0045] Note that, when the wearer 300 is wearing the diaper 100, the spacing of the thread rubber 190 does not become narrower for the outer portion 181b of the leg cuff portion 181 as it does for the inner portion 181a. Therefore, for the outer portion 181b, it is not necessary to widen the spacing s1 of the thread rubber 190, and rather, it is preferable not to widen it. The reason is as follows.

[0046] The thread rubber 190 is fixed to the outer covering sheet 140 by an adhesive member such as hot melt. The adhesive member hardens after the thread rubber 190 is fixed. For this reason, for the outer portion 181b, if the spacing s1 of the thread rubber 190 is widened, the distribution range of the thread rubber 190 becomes wider, and the hardened range of the adhesive member also becomes wider, leading to a deterioration in the texture of the outer portion 181b. Therefore, for the outer portion 181b, it is preferable to make the spacing s1 of the thread rubber 190 the smallest within the entire region where the thread rubber 190 is arranged. Thereby, the diaper 100 can prevent the texture from deteriorating in the outer portion 181b.

[0047] Also, the diaper 100 is set in a state substantially parallel to the reference line M (angle θ≈0) at the portion where the thread rubber 190 crosses the crotch portion 120 in the width direction W. The spacing s3 between the thread rubbers 190 in this substantially parallel state is preferably set to be larger than the spacing s1 in the outer portion 181b and smaller than the spacing s2 at the position where the inclination angle θ is maximum (s1 < s3 < s2).

[0048] By thus setting the spacing s3 of the thread rubber 190 at the portion crossing the crotch portion 120 in the width direction W to be larger than the spacing s1 in the outer portion 181b, the diaper 100 can secure a region along the length direction L where the thread rubber 190 is arranged in the crotch portion 120 to be wider than the region in the outer portion 181b. Thereby, the diaper 100 can support the absorber 150 stacked on the crotch portion 120 in a wide region of the crotch portion 120 from below, and can suppress the sagging (flapping) of the absorber 150.

[0049] In the above-described condition (s1 < s3), as shown in FIG. 4, the diaper 100 is at the position of the outer portion 181b in the longitudinal direction L of the thread rubber 191 disposed closest to the edge of the leg opening P3 with respect to the position in the overlapped ply portion 120 of the absorber 150, and the offset amount L2 is larger than the offset amount L1 at the position of the outer portion 181b in the longitudinal direction L of the thread rubber 195 disposed farthest from the edge of the leg opening P3 with respect to the position in the overlapped ply portion 120 of the absorber 150.

[0050] Therefore, the thread rubber 191 disposed closest to the edge of the leg opening P3 is disposed on a longer path than the thread rubber 195 disposed farthest from the edge of the leg opening P3. For this reason, when the thread rubber 190 having a constant length in the natural state before being stretched is applied to the thread rubber 191 and the thread rubber 195 respectively, the thread rubber 195 is fixed to the outer package sheet 140 in a more stretched state than the thread rubber 191. As a result, the leg cylinder portion 181 has a stronger tightening force on the side closer to the edge of the leg opening P3 than on the side farther from the edge of the leg opening P3.

[0051] Such a difference in the tightening force of the thread rubbers 191 and 195 according to the distance from the edge of the leg opening P3 also occurs similarly for the other three thread rubbers 190 other than the thread rubbers 191 and 195 having different distances from the edge of the leg opening P3. Therefore, as the diaper 100 approaches the edge of the leg opening P3, the tightening force of the thread rubber 190 becomes stronger. As a result, the interval between the thread rubbers 190 tends to become narrower.

[0052] Therefore, it is preferable that the diaper 100 weakens the elastic force of the thread rubber 190 as it approaches the edge of the leg opening P3. As a specific configuration for weakening the elastic force of the thread rubber 190, for example, the fineness (thickness) of the thread rubber 190 may be made thinner, the length of the thread rubber 190 in the natural length may be made longer, or the elastic modulus of the thread rubber 190 may be made smaller.

[0053] Thus, according to the diaper 100 in which the elastic force of the thread rubber 190 is made weaker as it approaches the edge of the leg opening P3, the tightening force of the thread rubber 190 can be made uniform regardless of the distance from the edge of the leg opening P3 in the leg cylinder part 181.

[0054] In the diaper 100 of the above-described embodiment, the interval s3 in the portion where the thread rubber 190 crosses the crotch part 120 overlaid with the absorber 150 in the width direction W was set larger than the interval s1 in the outer part 181b (s1 < s3), but the interval s1 in the outer part 181b and the interval s3 in the portion where the crotch part 120 overlaid with the absorber 150 crosses the width direction W may be set the same (s1 = s3).

[0055] In this case, the diaper 100 can equalize the tightening force of the thread rubber 190 regardless of the distance from the edge of the leg opening P3, and there is no need to set a difference in the elastic force of the thread rubber 190.

Explanation of Reference Numerals

[0056] 100 Trunk-type disposable diaper (trunk-type absorbent article) 120 Crotch part 150 Absorber 181 Leg cylinder part 181a Inner part 181b Outer part 190 Thread rubber 300 Wearer M Reference line P2, P2 Leg opening W Width direction s1, s2 Interval θ Angle

Claims

1. A trunk-type absorbent article having an ventral portion, a crotch portion, and a dorsal portion connected in the longitudinal direction, with the lateral portion of the ventral portion perpendicular to the longitudinal direction in the width direction connected to the lateral portion of the dorsal portion in the width direction, having a leg tube portion extending in a cylindrical shape in the direction of leg extension at the leg opening, and an absorbent material arranged in layers on the inner surface of the crotch portion, The elastic threads are arranged at predetermined intervals, extending from the outer portion of one of the leg tube sections of the dorsal and ventral sides to the inner portion along the circumferential direction of the one leg tube section, transitioning from the inner portion to the crotch section where the absorbent material is superimposed, traversing the crotch section in the width direction, transitioning to the inner portion of the other leg tube section of the dorsal and ventral sides, and extending from the inner portion to the outer portion of the other leg tube section along the circumferential direction of the other leg tube section. The spacing of the elastic thread at the position where the angle of the meandering inclination with respect to the width direction is greatest is set to be larger than the spacing in the outer portion and the spacing in the portion that is arranged across the crotch in the width direction. The position where the angle of inclination of the elastic thread is greatest is the portion where it transitions from the inner portion of one leg tube to the crotch portion where the absorbent material is superimposed, and the portion where it transitions from the crotch portion where the absorbent material is superimposed to the inner portion of the other leg tube. A trunk-type absorbent article wherein the spacing of the elastic threads in the portion that crosses the crotch area where the absorbent material is overlapped in the width direction is set to be larger than the spacing in the outer portion.

2. The trunk-type absorbent article according to claim 1, wherein the spacing of the elastic threads in the outer portion is set to the minimum in the entire area where the elastic threads are arranged.

3. The trunk-type absorbent article according to claim 1 or 2, wherein the elastic force of the multiple elastic threads is set to decrease as they approach the edge of the leg opening.

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