JP7340917B2 - absorbent articles - Google Patents

Description

The present invention relates to absorbent articles.

It has a ventral part and a dorsal part, and has a joint part in which at least one end in the lateral direction of the ventral part and the dorsal part are joined to each other in a state where they overlap in the thickness direction along the longitudinal direction. However, absorbent articles (eg, pants-type disposable diapers) are known in which the joint portion includes a plurality of fused portions spaced apart from each other in the longitudinal direction. For example, Patent Document 1 discloses a pants-type disposable diaper. In this disposable diaper, the side seal part (joint part) has a loosely welded area and a tightly welded area in the longitudinal direction, and the area of each welded part (fused part) in the tightly welded area is the same as that of the loosely welded area. The area is formed to be larger than the area of each welded part (fused part).

Japanese Patent Application Publication No. 2013-146419

When an absorbent article like Patent Document 1 is removed from a wearer after being used, a method is usually used in which the sheet member on the ventral side and the sheet member on the back side are peeled off from each other at the joint. Specifically, the method is to separate the sheet member on the ventral side and the sheet member on the dorsal side, which are joined at a plurality of welded parts, by breaking the sheet member at each welded part or the surrounding part. , a method in which they are continuously peeled off from each other in the longitudinal direction.

Here, absorbent articles can retain solid or semi-solid excreta such as feces (including soft feces) (hereinafter also simply referred to as "excrement"); It is difficult to absorb adequately. Therefore, when excrement is retained on the skin-side surface of the absorbent article, the absorbent article is usually replaced while the wearer is in a standing position. That is, while the wearer is in a standing position, the ventral side sheet member and the dorsal side sheet member, which are joined by a plurality of fused portions, are continuously peeled off from each other in the longitudinal direction at the joint portion.

However, if there is a welded part that is not completely fused among the multiple welded parts, cracks that occur in the welded part, etc. during the peeling off of the joints can cause damage to the ventral and dorsal parts. In some cases, it may spread to parts of the sheet member other than the joints, for example, the central part of the sheet member. In this case, it becomes difficult to continuously peel off the sheet member on the ventral side and the sheet member on the back side of the joint in the longitudinal direction, and the skin side of the absorbent article is removed from the crack that has developed in the sheet member in the central part. There is also the possibility that the surface may be exposed. In this case, there is a risk that excrement may leak to the outside from the exposed skin-side surface of the absorbent article. In the absorbent article of Patent Document 1, the pattern of the fused portion of the side seal portion (joint portion) is changed depending on the position of the fused portion, but the fused portion as described above is not completely fused. There is a possibility. Therefore, the same problems as described above may occur.

In addition, even if the joint is peeled off without cracking, if the amount of excrement discharged into the absorbent article is large, the excrement may be exposed on the skin side of the absorbent article. easy to become Therefore, during or after peeling off, the absorbent article may tilt with respect to a horizontal surface (for example, the floor), and there is a risk that excrement may move and come into contact with the wearer's legs or fall onto the floor. be.

Therefore, an object of the present invention is to provide an absorbent article having a joint, which is capable of suppressing contamination caused by excrement retained on the skin side surface of the absorbent article when the absorbent article is removed. Our goal is to provide the following.

The absorbent article of the present invention has (1) a longitudinal direction, a transverse direction, and a thickness direction that are perpendicular to each other, and has a ventral side portion including a ventral sheet member, a dorsal side portion including a dorsal sheet member, and one end. is connected to the ventral side part, and the other end is connected to the dorsal side part, and includes a top sheet, an absorbent body, and a back sheet in this order in the thickness direction, An absorbent article including a joint portion in which both end portions in the lateral direction of the back side portion and the back side portion are joined to each other in a state where they overlap in the thickness direction along the longitudinal direction, the joint portion comprising: It includes a plurality of fused parts spaced apart from each other along the longitudinal direction, and each of the plurality of fused parts is arranged such that the ventral sheet member and the dorsal sheet member are mutually arranged in the thickness direction. a peripheral wall in which the ventral sheet member and the dorsal sheet member are fused to each other in the thickness direction so as to extend cylindrically from the periphery of the core portion in the thickness direction; The absorbent main body includes a pair of leakage prevention walls that are arranged at both ends of the skin side in the lateral direction so as to face each other and extend continuously along the longitudinal direction, Each of the pair of leakage prevention walls includes an elastic member arranged along the longitudinal direction, and the effective length of the elastic member functioning as an elastic body is longer than the length of the absorbent body in the longitudinal direction. Also long, absorbent articles.

In this absorbent article, the fused portion of the joint portion includes a core portion and a peripheral wall portion. The presence of the peripheral wall portion can increase the tensile strength of the fused portion and stabilize the fusion of the fused portion. Thereby, it is possible to suppress the propagation of cracks to the sheet member in the central portion when the sheet member is peeled off.
Further, each of the pair of leakage walls of the absorbent body includes an elastic member having an effective length longer than the length of the absorbent body. By contracting the elastic member, each leakage prevention wall can be made to stand up very high, and the portions located on both longitudinally outer sides of the absorbent body in the ventral and dorsal sides are deformed into a shape that stands up. can be done. In other words, in addition to the walls on both sides of the horizontal direction (leakage prevention walls), the walls on both sides of the vertical direction (ventral and dorsal portions) are also made to stand up high to stably store a large amount of excrement. A large capacity storage area can be formed.
Thereby, even if a crack develops in the central portion during the process of peeling off the joint, it is possible to suppress the leakage of excrement in the accommodation area to the outside from the exposed skin-side surface of the absorbent article. Furthermore, even if the amount of excrement retained in the storage area is large and the absorbent article is tilted with respect to a horizontal plane (for example, the floor), excrement may leak from the storage area and come into contact with the wearer's legs, etc. can be restrained from doing so.
In addition, after tearing off the joint part, by pulling the part between the pair of leakage prevention walls at both longitudinal edges of the ventral part and the dorsal part outward in the longitudinal direction L, The pair of leakage walls that stand up high can be moved closer to each other in the lateral direction to narrow the relative distance between them. That is, the pair of leak-proof walls can be brought into contact with each other or overlapped with each other, so that at least a portion of the accommodation area can be covered by the pair of leak-proof walls from the skin surface side. Thereby, even after the joint is peeled off, excrement in the storage area can be prevented from coming into contact with the wearer's legs or falling onto the floor.
In such an absorbent article having a joint, it is possible to suppress contamination caused by excrement retained on the skin-side surface of the absorbent article when the absorbent article is removed.

The absorbent article of the present invention is (2) the absorbent article according to (1) above, wherein the effective length is 80% or more of the longitudinal length of the absorbent main body. It's okay.
In this absorbent article, the effective length of the elastic member is 80% or more of the length of the absorbent body. Therefore, the pair of leakage prevention walls, that is, the walls on both sides in the horizontal direction, are made to stand up higher, and the portions located on both sides of the absorbent body in the ventral and dorsal parts, that is, the walls on both sides in the longitudinal direction, are made to stand up higher. can be done. Therefore, a larger amount of excrement can be stored, and the capacity of the storage area can be increased. Thereby, leakage of excrement from the storage area can be further suppressed even during or after the joint is peeled off.

In the absorbent article of the present invention, (3) each of the pair of leakage prevention walls has a fixed end fixed to the absorbent main body, which is one edge in the horizontal direction, and a fixed end fixed to the absorbent main body. and a free end that is the other edge in the lateral direction, and the length from the free end to the fixed end of each of the pair of leakage prevention walls in the lateral direction is 50 mm. The absorbent article described in (1) or (2) above may have a length of 100 mm or less.
In this absorbent article, the length (lower limit) from the free end to the fixed end of the leakage barrier is 50 mm or more. Therefore, it is possible to secure the required height for the standing height of each leakage prevention wall, and also to ensure the necessary width for each of the pair of leakage prevention walls to cover the accommodation area from the skin side even after the joint is peeled off. can be secured. Thereby, leakage of excrement from the storage area can be further suppressed even after the joint is peeled off. On the other hand, the length (the upper limit) from the free end to the fixed end of the leak-proof wall is 100 mm or less from the viewpoint of preventing the wearer from feeling uncomfortable due to the leak-proof wall being too large.

In the absorbent article of the present invention, (4) each of the pair of leakage prevention walls has a base part fixed to the absorbent body at least at an outer edge in the lateral direction, and a base part fixed to the absorbent body at least at an outer edge in the lateral direction; A wall portion having an edge connected to an inner edge of the base, an outer edge being movable, and standing up when worn, as described in any one of (1) to (3) above. absorbent articles.
In this absorbent article, when worn, each wall part of the pair of leak-proof walls stands up together with the inner part of the base, and the surface opposite to the base (non-skin side surface) ( The skin-side surface) contacts the wearer's skin. Also, upon removal, the wall portion can laterally collapse inward and laterally contact or overlap with the other opposing wall portion. That is, at the time of removal, the storage area can be covered by the pair of walls from the skin side. This makes it possible to further prevent excrement in the accommodation area from coming into contact with the wearer's legs or falling onto the floor even when the wearer is removed after the joint is peeled off.

In the absorbent article of the present invention, (5) the absorbent article is located between the skin-side surface of the base and the non-skin-side surface of the wall, and the inner edge of the base in the lateral direction and the wall. has a predetermined width in the transverse direction shorter than the wall portion and the base portion and a predetermined length in the vertical direction from the connecting end where the inner edge in the horizontal direction is connected to the inner end edge in the horizontal direction, and the base portion and the wall portion The absorbent article described in (4) above may be provided with a connecting portion that partially connects the absorbent article.
In this absorbent article, the connecting portion partially connects the base and the wall at a position laterally outside the connecting end that connects the base and the wall. As a result, each of the pair of leakage walls can be formed to have a concave shape when viewed from the outside in the lateral direction, and therefore a protruding shape when viewed from the inside. Due to the convex part that protrudes when viewed from the inside, even if the absorbent article is tilted with respect to a horizontal plane (example: floor surface), the convex part acts as a kind of dam within the leak-proof wall, and the convex part acts as a kind of dam inside the leak-proof wall, allowing the absorbent article to move outward from the tilted leak-proof wall. It is possible to suppress leakage of excrement. Therefore, even when the absorbent article is removed from a wearer who is lying down, it is possible to further prevent excrement in the storage area from coming into contact with the wearer's legs or falling onto the floor.

In the absorbent article of the present invention, (6) the absorbent core includes a central region located at the center in the vertical direction, and a front region and a rear region located in front and rear of the central region in the vertical direction. The absorbent article according to any one of (1) to (5) above, wherein the lateral width of the central region is narrower than the lateral widths of the front region and the rear region. , may be.
In this absorbent article, the lateral width of the central region of the absorbent core is narrower than the lateral widths of the front and rear regions, and therefore the central region has low rigidity. Therefore, when the absorbent article is removed, the absorbent article is bent by the weight of excrement and the central region hangs down significantly, so that the leakage prevention wall in the central region can be made to stand up from the edge of the narrow absorbent body. That is, the height of the leakage prevention wall in the central region can be substantially increased, and the capacity of the storage region can be increased. Thereby, it is possible to further prevent excrement in the storage area from leaking from the leak-proof wall and coming into contact with the wearer's legs or falling onto the floor immediately after the absorbent article is removed.

In the absorbent article of the present invention, (7) the absorbent article has a waist opening and a leg opening, and the ventral side part and the dorsal side part have a central area in the longitudinal direction. a central region, a waist-side end region that is an end region on the side of the waist opening, and a leg-side end region that is an end region on the leg opening side; The peel strength of each of the plurality of fused parts in at least one of the waist side end region and the leg side end region in the central region is higher than the peel strength of each of the plurality of fused parts in the central region. The absorbent article described in any one of (1) to (6) above may be used.
In the present absorbent article, the peel strength of each of the plurality of fused parts in at least one of the waist end region and the leg end region is relatively high. As a result, for example, if the peel strength of the fused portion in the leg side end region is relatively high, when peeling off the joint from the waist opening side, each The ventral sheet member and the dorsal sheet member can be separated at once at or around the fused portion. At the same time, when the separation is transferred from the central region to the leg side end regions, the peel strength of the fused portion increases, so that the separation between the ventral sheet member and the dorsal sheet member can be temporarily stopped naturally. That is, a pause can be provided before the ventral sheet member and the dorsal sheet member are separated in the leg end region. Thereby, by peeling off the entire joint part at once, it is possible to prevent the skin-side surface of the absorbent article from being tilted and exposed vigorously, thereby preventing excrement from leaking from the leak-proof wall. After that, the ventral sheet member and the dorsal sheet member are carefully separated in the leg side end region by changing the gripping position of each sheet and slowing down the separation speed. Even if the skin-side surface of the absorbent article is exposed, it is possible to prevent excrement from leaking from the leakage barrier. If the peel strength of the fused portion in the waist end region is relatively high, the same applies when peeling off the joint from the leg opening side.
Examples of methods for increasing the peel strength include increasing the basis weight of at least one of the ventral sheet member and the dorsal sheet member to make the fused portion thicker and larger, or increasing the thickness of the core of each of the plurality of fused portions. Examples include a method of increasing the circumference of the shape of the part (the convex part of the ultrasonic horn). These methods can stably increase the peel strength of the fused portion.

In the absorbent article of the present invention, (8) in at least one of the ventral sheet member and the back sheet member, the lateral stress in at least one of the waist side end region and the leg side end region is , the absorbent article according to (7) above may be larger than the stress in the lateral direction in the central region.
In this absorbent article, in at least one of the ventral sheet member and the back sheet member, the lateral stress in at least one of the waist side end region and the leg side end region is larger than the lateral stress in the central region. It has become. Therefore, for example, if the stress in the leg end region is relatively large, when the joint is peeled off from the waist opening side, the ventral sheet member and back After the side sheet members are separated at once, when the separation is temporarily stopped before entering the leg side end area, even if the joint is partially torn off, the stress in the leg side end area will absorb the stress. The sex article can be kept attached to the wearer. Thereby, when the separation is temporarily stopped, it is possible to prevent the partially separated absorbent article from slipping off the waist of the wearer and leaking excrement from the leakage wall. If the stress in the waist end region is relatively large, the same applies when the joint is peeled off from the leg opening side.
Examples of methods for increasing the stress include arranging many elastic members extending in the lateral direction on the ventral and dorsal sides, or adjusting the thickness and magnification of the elastic members. These methods can stably increase stress.

The method of using the absorbent article of the present invention is (9) the method of using the absorbent article according to (7) or (8) above, in which when the absorbent article is removed from the wearer, the absorbent article is In each of the right and left side joints, separately, from the start region of one of the waist end region and the leg end region to the end region of the other, the a step of continuously peeling off the ventral sheet member and the dorsal sheet member from each other in the longitudinal direction and once stopping when the end region is reached; The center portions of the waist end region in the lateral direction are pulled apart from each other, and the ventral sheet member and the dorsal sheet member of the right and left joints in the lateral direction are pulled apart from each other in the end region. A method of using an absorbent article, comprising the step of simultaneously peeling off each other continuously in the longitudinal direction to the end.
In the present absorbent article, first, the ventral sheet member and the dorsal sheet member are peeled off from each other separately from the start region toward the end region at each of the right and left joint portions. Then, when the peeling reaches the end area, the peeling is temporarily stopped, leaving part or all of the end area. Then, at the joints on the right and left sides, the horizontal center portions of the waist end regions are simultaneously pulled apart from each other to continuously connect the ventral sheet member and the dorsal sheet member in the longitudinal direction. Peel each other until the end.
In this way, first tear the left and right joints separately, leaving only a portion, then grasp the front and back waist end areas and pull them all at once to remove the remaining left and right joints. break at the same time. Thereby, the leak-proof wall can be easily removed from the wearer's body without tilting or shifting.
At this time, a possible method for peeling off the joints is, for example, first peeling off all the joints on the right side at once, and then peeling off all the joints on the left side at once. However, in that case, when the right side joint is peeled off, the absorbent article tilts to the right side, and the excrement is biased to the right side, which may cause the excrement to leak from the right side leakage wall.
However, in this method of use, for example, first the right joint is broken leaving a portion, and then the left joint is broken leaving a portion. Therefore, at this stage, the absorbent article does not tilt to either the right or left side. Then, the remaining left and right joints are simultaneously broken. Therefore, the absorbent article can be peeled off at once without tilting it.
As a result, it is possible to prevent the absorbent article from tilting, causing the excrement to be unevenly distributed, and thereby preventing the excrement from leaking from the leakage barrier.

According to the present invention, in an absorbent article having a joint, when the absorbent article is removed, it is possible to suppress contamination caused by excrement held on the skin-side surface of the absorbent article.

It is a perspective view showing an example of composition of a disposable diaper concerning an embodiment. FIG. 2 is a plan view showing an expanded state of a configuration example of a disposable diaper. 3 is a sectional view taken along line III-III in FIG. 2. FIG. 3 is a sectional view taken along the line IV-IV in FIG. 2. FIG. FIG. 3 is a schematic view of the ventral side and dorsal side of the armor as viewed from the side of the lateral end. It is a top view showing an example of composition of an absorbent main body. It is a top view which shows the example of a structure of the joint part in a disposable diaper. FIG. 3 is a schematic diagram illustrating a method of forming a fused portion. FIG. 2 is a plan view and a cross-sectional perspective view showing a configuration example of a fused portion. FIG. 3 is a plan view illustrating a configuration example of a plurality of fused parts in a joint part. FIG. 3 is a schematic diagram illustrating how a fused portion is peeled off. It is a schematic diagram explaining the state of an absorbent article after peeling off. It is a schematic diagram explaining the state of an absorbent article after peeling off. It is a schematic diagram explaining the peeling method of the joint part of an absorbent article. FIG. 7 is a plan view illustrating another configuration example of a plurality of fused parts in a joint part. FIG. 7 is a plan view showing another example of the structure of the fused portion.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Absorbent articles according to embodiments of the present invention will be described below using a pants-type disposable diaper (hereinafter also simply referred to as a "disposable diaper") as an example. However, the present invention is not limited to this example, and can be applied to various absorbent articles without departing from the subject matter of the present invention. Examples of absorbent articles include so-called three-piece type and two-piece type disposable diapers.

1 to 4 are diagrams showing a disposable diaper 1 according to this embodiment. 1 is a perspective view showing a configuration example of the disposable diaper 1, FIG. 2 is a plan view showing the disposable diaper 1 in an expanded state, and FIG. 3 is a sectional view taken along line III-III in FIG. , FIG. 4 is a sectional view taken along the line IV-IV in FIG. 2. In the state shown in FIG. 2, the disposable diaper 1 has a vertical direction L, a horizontal direction W, and a thickness direction T that are orthogonal to each other, and a central axis CL that passes through the center of the horizontal direction W and extends in the vertical direction L, and It has a central axis CW passing through the center of the direction L and extending in the lateral direction W. Here, the direction and side toward the central axis CL are defined as inward and inward in the lateral direction W, respectively, and the direction and side away from the center axis CL are defined as outward and outward in the lateral direction W, respectively. On the other hand, the direction and side toward the central axis CW are respectively defined as inward and inward in the vertical direction L, and the direction and side away from the central axis CW are defined as outward and outward in the vertical direction L, respectively. Also, viewing the disposable diaper 1 placed on a flat surface in the thickness direction T from the vertically upper side of the flat surface is referred to as a "planar view", and the shape grasped in a planar view is referred to as a "planar shape"; Any direction within a plane including L and the lateral direction W is referred to as an "in-plane direction." "Skin side" and "non-skin side" refer to the side relatively close to the wearer's skin surface and the side far away from the wearer's skin surface in the thickness direction T of the disposable diaper 1 when the disposable diaper 1 is worn. Note that the above-mentioned definitions are also used for each material of the disposable diaper 1 and the disposable diaper 1 in the state shown in FIG.

The disposable diaper 1 includes a ventral part 11, a dorsal part 13, and an intermediate part 12 between the ventral part 11 and the dorsal part 13. The abdominal part 11 is the part of the disposable diaper 1 that faces the wearer's abdomen. The intermediate portion 12 is a portion of the disposable diaper 1 that faces the wearer's crotch area. The back side portion 13 is a portion of the disposable diaper 1 that faces the buttocks or back of the wearer. The ventral side part 11 and the dorsal side part 13 are joined to each other at a pair of joint parts 14a and 14b located at both ends of the ventral side part 11 and the dorsal side part 13 in the lateral direction W. The joint part 14a is in a state where one end 11a of the ventral part 11 in the lateral direction W and one end 13a of the dorsal part 13 in the lateral direction W overlap in the thickness direction T along the longitudinal direction L. are formed by being joined to each other. Similarly, in the joint portion 14b, the other end 11b of the ventral part 11 in the lateral direction W and the other end 13b of the dorsal part 13 in the lateral direction W extend in the thickness direction T along the longitudinal direction L. They are formed by being joined to each other in an overlapping state. In this case, in the disposable diaper 1, the waist opening WO through which the waist of the wearer passes is formed by the outer end 11e of the abdominal part 11 in the longitudinal direction L and the outer end 13e of the back part 13 in the longitudinal direction L. defined. Further, in the disposable diaper 1, the side portions 12a and 12b on both sides in the lateral direction W in the intermediate portion 12 define a pair of leg openings LO and LO through which the wearer's legs pass. Note that the vertical direction, horizontal direction, and thickness direction of each joint portion 14a, 14b in the state shown in FIG. 1 are the same as the vertical direction L, horizontal direction W, and thickness direction T in the state shown in FIG. .

In this embodiment, in the state shown in FIG. 2, the ventral side part 11 and the dorsal side part 13 each have a rectangular shape that generally extends in the horizontal direction W, and are located apart from each other in the vertical direction L. The intermediate part 12 is located between the ventral part 11 and the dorsal part 13, and both side edges in the lateral direction W are depressed inward in the lateral direction W. The ventral part 11, the middle part 12, and the dorsal part 13 are integrally formed with each other. In another embodiment (not shown), ventral section 11, intermediate section 12 and dorsal section 13 are formed separately from each other.

In this embodiment, the disposable diaper 1 includes a plurality of elastic members 8a and 8b for waist gathers on the abdominal part 11 and the back part 13, respectively. The plurality of elastic members 8a extend from one end 11a in the horizontal direction W to the other end 11b along the end 11e in the longitudinal direction L of the abdominal part 11, and are arranged at intervals in the longitudinal direction L. has been done. Similarly, the plurality of elastic members 8b extend from one end 13a in the horizontal direction W to the other end 13b along the end 13e in the longitudinal direction L of the back side part 13, and are spaced apart from each other in the longitudinal direction L. It is placed empty. The plurality of elastic members 8a and 8b expand and contract the waist opening WO, and are exemplified by rubber threads.

In this embodiment, the disposable diaper 1 includes a plurality of elastic members 8c, 8c' for leg gathers from the middle part 12 to the back part 13 and the ventral part 11. The plurality of elastic members 8c, 8c' extend along the horizontal direction W at the center of the longitudinal direction L in the intermediate section 12, reach both ends of the intermediate section 12 in the horizontal direction W, and then extend along the longitudinal direction L. They are continuously arranged at intervals from each other so as to extend to the ends 13a, 13b of the dorsal part 13 and the ends 11a, 11b of the ventral part 11, respectively. The plurality of elastic members 8c and 8c' extend and contract the pair of leg openings LO and LO, respectively, and are exemplified by rubber threads.

In this embodiment, the ventral side part 11, middle part 12, and back side part 13 of the disposable diaper 1 are formed from a liquid-impermeable cover sheet (sheet member) 5. FIG. 5 is a schematic diagram of the ventral part 11 and the dorsal part 13 viewed from the end side in the lateral direction W. However, for ease of understanding, each cover sheet 5 is shown separately, and description of the elastic member is omitted. The cover sheet 5 includes a cover sheet 5a located on the skin side and a cover sheet 5b located on the non-skin side, which are laminated on each other in the thickness direction T and bonded to each other with an adhesive or the like. Both ends of the cover sheet 5b in the longitudinal direction L are folded back toward the skin so as to cover both ends of the cover sheet 5a in the longitudinal direction L. In that case, the cover sheet 5b at the folded position in the ventral part 11 and the dorsal part 13 constitutes an end 11e of the ventral part 11 and an end 13e of the dorsal part 13, respectively. Region A is a region with three layers of cover sheets, and region B is a region with two layers of cover sheets. Therefore, the end 11e of the ventral part 11 and the end 13e of the dorsal part 13 have a three-layer structure in which three cover sheets 5b, 5a, and 5b are laminated. The length in the vertical direction L of each three-layer structure is, for example, 10 mm to 100 mm. In this embodiment, the plurality of elastic members 8a, 8b, 8c, 8c' are located between the cover sheet 5a and the cover sheet 5b. In this case, the plurality of elastic members 8a, 8b extend between the cover sheets 5a, 5b of the ventral side part 11 and the dorsal side part 13, respectively, in the lateral direction W from one of the joint parts 14a and the joint part 14b to the other, and extend vertically. They are arranged so as to be spaced apart from each other in the direction L, and are arranged so as to be in a predetermined extended state in the unfolded state shown in FIG.

Examples of the cover sheet 5 include any liquid-impermeable sheet such as a liquid-impermeable nonwoven fabric, a synthetic resin film, a composite sheet thereof, an SB nonwoven fabric, and an SMS nonwoven fabric. Examples of the material for the cover sheet 5 include polyolefin materials such as polypropylene and polyethylene. The basis weight of the cover sheet 5 is, for example, 5 to 100 g/m ² , preferably 10 to 50 g/m ² . The dimension (thickness) of the cover sheet 5 in the thickness direction T is, for example, 0.1 to 5 mm, preferably 0.1 to 2 mm. In another embodiment, there is one cover sheet 5, or two or more cover sheets 5 (not shown). In yet another embodiment, the cover sheet 5b is not folded back.

In this embodiment, the disposable diaper 1 includes an absorbent main body 10 joined to the skin-side surface of the cover sheet 5. FIG. 6 is a plan view showing an example of the structure of the absorbent main body 10. The absorbent main body 10 has a substantially rectangular shape, is located between a liquid-permeable top sheet 2, a liquid-impermeable back sheet 3, and the top sheet 2 and the back sheet 3, and absorbs liquid.・Includes an absorbent body 4 for holding. Examples of the surface sheet 2 include liquid-permeable nonwoven fabrics and woven fabrics, synthetic resin films with liquid-permeable holes, composite sheets thereof, and the like. Examples of the back sheet 3 include liquid-impermeable nonwoven fabrics, synthetic resin films, composite sheets thereof, SMS nonwoven fabrics, and the like. In this embodiment, the absorbent body 4 includes an absorbent core that absorbs and retains liquid and a core wrap that encloses the absorbent core. Examples of the absorbent body 4 include pulp fibers, synthetic fibers, absorbent polymers, and the like. The absorbent body 4, the top sheet 2, and the back sheet 3 are each bonded with an adhesive, and the top sheet 2 and the back sheet 3 are bonded at their peripheral portions with an adhesive. The adhesive may be a material known for disposable diapers, such as a hot melt adhesive. The shape of the absorbent main body 10 is not limited to the above example as long as it is long in the vertical direction L, and examples include a rectangle with rounded corners, a rectangle with outwardly convex short sides, and an hourglass shape. The lower limit of the length D _K of the absorbent main body 10 in the longitudinal direction L (the length between the edge 10e1 and the edge 10e2) is, for example, 85% of the length of the cover sheet 5, A length of 90% is preferred, and a length of 95% is more preferred. Thereby, the storage capacity of excrement in the absorbent main body 10 can be increased. Due to the structure of the product, the upper limit of the length _DK of the absorbent body 10 in the longitudinal direction L is 100% of the length of the cover sheet 5. Note that the lengths of the cover sheet 5 and the absorbent main body 10 in the vertical direction L are measured at the positions where the length _DK of the cover sheet 5 and the absorbent main body 10, respectively, in the longitudinal direction L is maximum.

The absorbent main body 10 includes a pair of leak-proof walls 6a and 6b. The pair of leakage prevention walls 6a and 6b are arranged at both ends of the skin-side lateral direction W of the absorbent main body 10 so as to face each other, and extend continuously along the vertical direction L. In this embodiment, each of the pair of leakage prevention walls 6a, 6b is formed of a hydrophobic sheet, for example, a hydrophobic nonwoven fabric, but is not limited to this example. Good too. The lower limit of the length _DL in the vertical direction of each of the pair of leakage walls 6a, 6b includes, for example, 85% of the length _DK in the vertical direction of the absorbent main body 10, and 90% A length of 95% is preferred, and a length of 95% is more preferred. As a result, the area between the pair of leakage walls 6a and 6b that can accommodate excrement can be expanded in the vertical direction L, and the capacity for accommodating excreta can be increased. The upper limit of the length D _L of each leakage barrier in the vertical direction L is 100% of the length due to the structure of the product. The length D _L of each of the pair of leakage prevention walls 6a, 6b in the vertical direction L is measured at a position where each of the pair of leakage prevention walls 6a, 6b includes elastic members 8d, 8e (described later).

In this embodiment, as shown in FIGS. 3 and 4, each of the pair of leakage prevention walls 6a, 6b has a fixed end SE that is one edge in the lateral direction W fixed to the absorbent main body 10. , and has a free end FE that is not fixed to the absorbent main body 10 and is the other edge in the lateral direction W. Each of the pair of leakage prevention walls 6a, 6b is formed such that a portion from the fixed end SE to the free end FE can stand upright in the thickness direction T, with the fixed end SE as a base point. That is, it can be said that the length in the lateral direction W of the portion from the fixed end SE to the free end FE of each leak-proof wall is substantially the height of each leak-proof wall. Here, the lower limit of the height of each leakage wall (the length from the fixed end SE to the free end FE measured along the surface of the sheet constituting each leakage wall) is 50 mm, and 60 mm. A length of 70 mm is preferred, and a length of 70 mm is more preferred. Since the height of the pair of leakage prevention walls 6a, 6b when standing up can be increased, the area where excrement can be accommodated between the pair of leakage prevention walls 6a, 6b can be expanded in the thickness direction T, and the excrement can be Capacity can be increased. The upper limit of the height of each leakage barrier is 100 mm from the viewpoint of suppressing the discomfort felt by the wearer when wearing the product. Note that the length of each leakage prevention wall in the lateral direction W is measured at the position where the length (width) of the absorber 4 in the lateral direction W is maximum. Further, in the present embodiment, the fixed end SE is located at or near both edges of the absorbent body 4 in the lateral direction W (within a region inside by the maximum thickness of the absorbent body 4 from the edge). . Thereby, the length of the portion in the lateral direction W from the fixed end SE to the free end FE in each leakage prevention wall can be effectively utilized for a long time, and therefore the height of each leakage prevention wall can be made higher. In another embodiment, the fixed end SE is located above the skin-side surface of the absorbent body 4.

In this embodiment, the leakage prevention wall 6a includes a base portion 63a and a wall portion 64a. The base portion 63a has at least the outer edge 6aE fixed to the absorbent main body 10 in the lateral direction W. In the lateral direction W, the wall portion 64a has an inner edge connected to an inner edge of the base portion 63a, an outer edge that is movable, and stands up when worn. Hereinafter, the common inner edge of the base 63a and the wall 64a will also be referred to as the connecting end CE. The outer edge of the wall portion 64a is a free end FE. In this embodiment, a portion of the base 63a from the outer edge 6aE to the fixed end SE inner than the edge 6aE is joined to the top sheet 2. The portion of the base 63a from the fixed end SE to the connecting end CE is not joined to the topsheet 2, and can stand up from the surface of the topsheet 2 upward in the thickness direction T with the fixed end SE as a base point. It is formed. The wall portion 64a is formed such that the free end FE can rise upward in the thickness direction T from the connecting end CE. That is, the leakage prevention wall 6a as a whole is formed so that the base portion 63a and the wall portion 64a can rise upward in the thickness direction T from the fixed end SE. Similarly, the leakage prevention wall 6b includes a base portion 63b, a wall portion 64b (edge 6bE). The base 63b and wall 64b (edge 6bE) are also the same as the base 63a and wall 64a (edge 6aE), except that they are line symmetrical with respect to the central axis CL. The leak-proof wall 6b as a whole is formed such that the base portion 63b and the wall portion 64b can rise upward in the thickness direction T from the fixed end SE as a base point.

In this embodiment, the leakage prevention wall 6a includes a joint portion 61a located between the skin-side surface of the base portion 63a and the non-skin-side surface of the wall portion 64a. The connecting portion 61a has a predetermined width in the horizontal direction W shorter than the wall portion 64a and the base portion 63a from the connecting end CE (the connecting portion between the inner edge of the base 63a and the inner edge of the wall portion 64a in the horizontal direction W). It has a predetermined length in the vertical direction L, and partially connects the base 63a and the wall 64a. That is, the wall portion 64a is formed so that it can easily open outward from the base portion 63a with the connecting end CE as a base point, so that one surface 6aS of the wall portion 64a can easily face the skin side. The coupling portions 61a are arranged along the longitudinal direction L on both sides of the central axis CW. The length of the joint 61a in the vertical direction L is, for example, 10% to 90% of the length D _L of the leakage prevention wall in the vertical direction, preferably 20% to 80%, and 30% to 90%, preferably 20% to 80%. More preferably, the length is between % and 70%. If it is less than 10%, it is difficult for the surface 6aS of the wall portion 64a to face the skin, and if it is more than 90%, the leakage prevention wall 6a cannot stand up sufficiently. Similarly, the leakage prevention wall 6b includes a joint portion 61b located between the non-skin side surface of the base portion 63b and the skin side surface of the wall portion 64b. The joint portion 61b is the same as the joint portion 61a except that it is line symmetrical with respect to the central axis CL. That is, the wall portion 64b is formed so that it can easily open outward from the base portion 63b with the connecting end CE as a base point, so that one surface 6bS of the wall portion 64b can easily face the skin side.

In this embodiment, the leakage prevention wall 6a includes elastic members 8d arranged along the longitudinal direction L. The elastic member 8d expands and contracts the leakage prevention wall 6a in the vertical direction L. In this embodiment, as the elastic members 8d, a plurality of elastic members extend in the vertical direction L and in the horizontal direction W at a portion of the wall portion 64a near the free end FE and a portion of the base portion 63a near the connecting end CE. They are placed side by side with space between them. For example, three elastic members are arranged in a portion of the wall portion 64a closer to the free end FE, and two elastic members are arranged in a portion closer to the connecting end CE of the base portion 63a. Similarly, the leakage prevention wall 6b includes an elastic member 8e arranged along the longitudinal direction L. The elastic member 8e is the same as the elastic member 8d except that it is line symmetrical with respect to the central axis CL.
The elastic members 8d and 8e are, for example, rubber threads, and are arranged so as to be in a predetermined elongated state in the unfolded state shown in FIG. By contracting the elastic members 8d and 8e in the vertical direction L, the pair of leakage prevention walls 6a and 6b can be contracted in the vertical direction, thereby allowing the pair of leakage prevention walls 6a and 6b to stand up, and the pair of leakage prevention walls 6a , 6b is formed with a storage area capable of storing excrement.

The effective length D _E of each of the elastic members 8 d and 8 e serving as an elastic body is longer than the length _DA of the absorbent body 4 in the longitudinal direction L. That is, D _A < D _E. However, the effective length _DE is the length of the elastic member excluding the length of the non-elastic part (example: mainly both ends) when the elastic member is placed in the disposable diaper 1. is the length of A non-elastic part may be a case where the part itself does not have elasticity, or a state in which the elastic member is placed in the disposable diaper 1, and the part itself has elasticity but is fixed with adhesive etc. This includes cases in which elasticity cannot be exerted. Note that the non-elastic portion refers to the Young's modulus (stress/strain) of a portion of the elastic member that is 1/3 of the length of the elastic member in a range that straddles the central axis CW and is symmetrical to the central axis CW. is defined as a portion having a Young's modulus that is three times or more that of the reference. Note that Young's modulus can be measured by a method based on JIS K 6327 (or JIS K 6251). In this embodiment, D _A < D _E in at least one of the plurality of elastic members as each of the elastic members 8 d and 8 e. The lower limit of the effective length _DE is preferably 105%, more preferably 110%, and even more preferably 120% of the length _DA of the absorber 4. Note that, due to the structure of the product, the upper limit of the effective length _DE is 130% of the length _DA of the absorber 4. Thereby, the storage area that can accommodate excrement between the pair of leakage prevention walls 6a and 6b can be deepened substantially in the thickness direction T, and the capacity of excrement that can be accommodated can be increased. Note that the length _DA of the absorbent body 4 in the vertical direction L is measured at the position where the length of the absorbent body 4 in the vertical direction L is maximum.

In this embodiment, the lower limit of the effective length _DE of each of the elastic members 8d and 8e is, for example, 80% of the length _DK of the absorbent main body 10 in the longitudinal direction, and 85% of the length is preferred, and a length of 90% is more preferred. The volume of the storage area that can accommodate excrement between the pair of leakage walls 6a and 6b as described above can be increased. The upper limit of the effective length _DE is 100% due to manufacturing constraints. The lower limit of the length D _M of each of the elastic members 8d and 8e in the longitudinal direction L is, for example, 85% of the length D L of the absorbent main body 10 in the longitudinal direction, and 90% of the length D _L of the absorbent main body 10. preferably 95%, more preferably 95%. This is to keep the effective length _DE of each of the elastic members 8d and 8e within the above-mentioned predetermined range. Note that, due to the structure of the product, the upper limit of the length _DM of each of the elastic members 8d and 8e is 100% of the length _DL of the absorbent main body 10.

In this embodiment, the absorbent core 4 includes a central region K ₂ located at the center in the longitudinal direction L, a front region K ₁ and a rear region K ₃ located in front and behind the central region K ₂ in the longitudinal direction L, has. Here, the anterior region K ₁ corresponds to the anterior part of the ventral part 11 and the intermediate part 12 , and the posterior region K ₃ corresponds to the posterior part of the dorsal part 13 and the intermediate part 12 . The width of the central region _K2 in the lateral direction W is narrower than the width of the front region _K1 and the rear region _K3 in the lateral direction W. Therefore, when the pair of leakage prevention walls 6a, 6b stands up, in the central region _K2 , the pair of leakage prevention walls 6a, 6b do not stand up from the fixed ends SE, SE, but from both end edges of the absorbent body 4. Able to stand up. That is, in addition to the pair of leakage prevention walls 6a and 6b, the laminated portions GZ and GZ (FIG. 4) of the top sheet 2 and back sheet 3 between both ends of the absorbent body 4 and the fixed ends SE and SE (FIG. 4) also stand up. Different. As a result, the height of each leakage prevention wall in the central region K2, where more excreta is excreted, can be substantially increased.

Next, the configuration of the joint portions 14a and 14b will be explained. However, the joint portion 14a and the joint portion 14b have substantially the same configuration except for the left and right differences in the lateral direction W. Therefore, below, the configuration of the joint portion 14a will be mainly explained, and the description of the configuration of the joint portion 14b will be omitted.

FIG. 7 is a plan view schematically showing a configuration example of the joint portion 14a in the disposable diaper 1. As shown in FIG. FIG. 7 is a view of the joint portion 14a viewed from the back side portion 13 side. In this embodiment, in the joint portion 14a, the outer edge 11ae in the longitudinal direction L of the end portion 11a in the ventral side portion 11 and the outer edge 13ae in the longitudinal direction L of the end portion 13a in the dorsal side portion 13. Almost overlap. The dimensions of the joint portion 14a in the vertical direction L and the horizontal direction W are, for example, 50 to 250 mm and 3 to 20 mm, respectively. In another embodiment, the edge 11ae and the edge 13ae are shifted by a predetermined length (eg, 0.5 to 10 mm) in the longitudinal direction L (not shown).

The joint portion 14a includes a plurality of welded portions 30 that are spaced apart from each other along the longitudinal direction L. In this case, the end portion 11a and the end portion 13a are joined by at least a plurality of fused portions 30. A portion of the joint portion 14a where the fused portion 30 is not formed is not joined. In another embodiment, all or part of the portion of the joint 14a where the fused portion 30 is not formed is joined with an adhesive (eg, hot melt adhesive) (not shown).

In this embodiment, in the joint portion 14a, the plurality of fused portions 30 are arranged side by side at intervals along the longitudinal direction L, thereby forming a fused portion row 30L. The fused part row 30L is one row, and the interval between the fused parts 30 in the vertical direction L is constant. In another embodiment, all or part of the fused portion rows 30L are multiple rows, and in the multiple row portion, the multiple rows are arranged side by side with intervals in the lateral direction W (not shown). In yet another embodiment, the interval in the vertical direction L between the fused parts 30 in all or part of the fused part row 30L varies depending on the position (not shown).

In this embodiment, the joint portion 14a has, in the longitudinal direction L, a waist side end region 21 including an end on the waist opening WO side, and a leg side end region 23 including an end on the leg opening LO side. , and a central region 22 between the two regions. The waist side end region 21 and the leg side end region 23 are regions ranging from 1/8 to 1/3 of the joint portion 14a from the edges of the waist opening WO and leg opening LO, respectively, in the longitudinal direction L. The central region 22 is the remaining region. The waist end region 21 and the leg end region 23 have the same length in the longitudinal direction L. In each region, the fused parts 30 are arranged in the same number of rows and at the same intervals (subject to manufacturing errors). In another embodiment, the waist end region 21 and the leg end region 23 have different lengths in the longitudinal direction L (not shown). In yet another embodiment, at least one of the size, spacing, and number of rows of the welds 30 is different in at least one region than in another region (not shown).

In this embodiment, the plurality of elastic members 8a are provided between the cover sheets 5a and 5b of the abdominal part 11 so as to extend in the horizontal direction W to the joint parts 14a and 14b, and to be lined up at intervals in the vertical direction L. . Similarly, the plurality of elastic members 8b are provided between the cover sheets 5a, 5b of the back side portion 13 so as to extend in the horizontal direction W to the joint portions 14a, 14b, and to be lined up at intervals in the vertical direction L. The plurality of elastic members 8a and 8b (preferably also the elastic members 8c and 8c') are arranged so as not to overlap the plurality of fused parts 30 in the thickness direction T at least in the joint part 14a.

In this embodiment, in at least one of the cover sheet 5 (ventral sheet member) of the ventral side portion 11 and the cover sheet 5 (dorsal side sheet member) of the dorsal side portion 13, the elastic member 8a of the waist side end region 21, The elastic force of the elastic member 8b is stronger than the elastic force of the elastic members 8a and 8b of the central region 22. Here, the number of elastic members 8a, 8b in the waist side end region 21 is made larger than the number of elastic members 8a, 8b in the central region 22. Therefore, the stress in the lateral direction W in the waist side end region 21 can be made larger than the stress in the lateral direction W in the central region 22. Thereby, when the joint portion is peeled off from the leg side end region 23, the disposable diaper 1 can be temporarily held only by the fused portion 30 of the waist side end region 21. Note that methods for increasing the stress include not only a method of increasing the number of elastic members, but also a method of adjusting the thickness and magnification of the elastic members, for example. In another embodiment, the elastic force of the elastic members 8a, 8b of the leg side end regions 23 in at least one of the cover sheet 5 of the ventral part 11 and the cover sheet 5 of the dorsal part 13 is the same as that of the elastic members of the central region 22. It is stronger than the elastic force of 8a and 8b. Therefore, the stress in the lateral direction W in the leg side end region 23 can be made larger than the stress in the lateral direction W in the central region 22. Thereby, when the joint portion is peeled off from the waist side end region 21, the disposable diaper 1 can be temporarily held only by the fused portion 30 of the leg side end region 23.

In this embodiment, the waist side end region 21 corresponds to the region A (FIG. 5) where the cover sheet 5 has three layers, and the leg side end region 23 and the central region 22 correspond to the region where the cover sheet 5 has two layers. Corresponds to B (FIG. 5). Therefore, the basis weight of the cover sheet 5 in the waist side end region 21 is higher than the basis weight of the cover sheet 5 in the leg side end region 23 and the center region 22. Therefore, the peel strength of each of the plurality of fused parts 30 in the waist side end region 21 at the joint parts 14a and 14b can be made higher than the peel strength of each of the plurality of fused parts 30 in the central region 22. Thereby, when the joint portion is peeled off from the leg opening LO side, when the peeling reaches the waist side end region 21, the peeling can be naturally and temporarily stopped. Note that methods for increasing the peel strength include not only increasing the basis weight of the cover sheet 5, but also increasing the number of fused parts, increasing the area, and increasing the circumference, for example. In another embodiment, the peel strength of each of the plurality of fused parts 30 of the leg side end regions 23 in the joint parts 14a and 14b is higher than the peel strength of each of the plurality of fused parts 30 in the central region 22. expensive.

8 to 10 are diagrams schematically illustrating configuration examples of the fusion part 30. FIG. 8 shows a method of forming the fused portion 30, and FIG. 9 shows an example of the structure of the fused portion 30. show. FIG. 10 shows an example of the structure of the plurality of fused parts 30 of the joint part 14a, and FIG. b) shows the shape and arrangement of the convex portion 41 of the anvil (or ultrasonic horn) that forms the fused portion 30 by the ultrasonic sealing method.

In this embodiment, as shown in FIG. 8, a laminate S of cover sheets 5a, 5b at both ends 11a, 11b of the ventral side part 11 and cover sheets 5a, 5b at both ends 13a, 13b of the dorsal side part 13 is used. are respectively held between the ultrasonic horn 43 of the bond forming device and the convex portion 41 of the anvil. Then, by supplying a predetermined ultrasonic energy to the sandwiched portions for a predetermined period, the cover sheets 5b, 5a, 5a, and 5b are fused to each other to form a core portion MC and a peripheral wall portion SW. A fused portion 30 is formed. The shape of the core part MC and the peripheral wall part SW can be controlled by adjusting the magnitude of the energy supplied from the joint forming device, the timing and period of supply, and so on. Examples of such a bond forming apparatus include those described in JP-A No. 2004-298413 and JP-A No. 2006-192902. For example, by setting the conveyance speed lower than usual, by increasing the energy higher than usual, or by making the size of the convex part 41 smaller than usual, the area where the fused part of the cover sheet is to be formed can be set. By increasing the supplied energy density per unit area and using energy efficiently, it is possible to control so that sufficient energy is applied not only to the tip of the protrusion 41 but also to the periphery of the protrusion 41. . Thereby, not only the core portion MC, which is normally formed at the tip of the convex portion 41, but also the peripheral wall portion SW can be formed around the convex portion 41. Note that the convex portion may be formed on the ultrasonic horn, and the anvil may be formed flat.

In the present embodiment, as shown in FIG. They have a structure in which they are fused together in the transverse direction T. The core portion MC is formed by the plurality of cover sheets 5b, 5a, 5a, 5b being compressed in the thickness direction T, melted by the energy of the ultrasonic horn, and then solidified. It is extremely strongly joined at T. The dimension (thickness) dT of the core portion MC in the thickness direction T is, for example, 20 to 500 μm. The dimension dT is significantly smaller than the dimension in the thickness direction T (example: 200 to 5000 μm) obtained by simply laminating the cover sheets 5b, 5a, 5a, and 5b of the ventral part 11 and the dorsal part 13. If dT is less than 20 μm, the fusion between the cover sheets will not be stable and holes will easily form during fusion, and if it exceeds 500 μm, the fused portion will be hard and the wearer will feel uncomfortable.

In the present embodiment, in the fused part 30, the position of the core part MC in the thickness direction T is shifted from the boundary between the ventral part 11 and the dorsal part 13 toward the ventral part 11 or the dorsal part 13. There is. The position of the core portion MC in the thickness direction T is the center position of the core portion MC in the thickness direction T. If the core portion MC is not flat, the center position in the thickness direction T of the core portion MC is at the joint portion between the core portion MC and the peripheral wall portion SW in the longitudinal direction L. For example, in the example of FIG. 9(b), the position of the core part MC in the thickness direction T is shifted toward the ventral part 11, and is located between the cover sheet 5a and the cover sheet 5b of the ventral part 11. be. The deviation in the thickness direction T from the boundary between the ventral part 11 and the dorsal part 13 is, for example, 10 to 500 μm. In another embodiment, the position of the end surface of the core part MC in the thickness direction T matches the position of the end surface of the cover sheet 5 of the ventral part 11 or the back part 13 in the thickness direction T.

In the present embodiment, the peripheral wall part SW of the fused part 30 surrounds the core part MC and extends cylindrically from the periphery of the core part MC in the thickness direction T. , 5b and a plurality of cover sheets 5a, 5b of the back side portion 13 are fused together in the thickness direction T. The peripheral wall portion SW is slightly compressed in the thickness direction T by the plurality of cover sheets 5b, 5a, 5a, and 5b being dragged by the compression of the core portion MC, and is heated by the energy of the ultrasonic horn or when the core portion MC is fused. It is formed by being melted by heat and then solidifying. Therefore, the peripheral wall portion SW is relatively strongly joined in the thickness direction T. The dimension (thickness) DT of the peripheral wall portion SW in the thickness direction T is, for example, 100 to 1000 μm. The dimension DT of the peripheral wall part SW is smaller than the dimension in the thickness direction T of simply laminating the cover sheets 5b, 5a, 5a, 5b of the ventral part 11 and the dorsal part 13 (example: 200 to 5000 μm). However, since the peripheral wall portion SW is not pressurized by the ultrasonic horn 43 or the convex portion 41 of the anvil, the dimension DT of the peripheral wall portion SW is larger than the dimension dT (illustration: 20 to 500 μm) of the core portion MC. If the size of DT is less than 100 μm, the breaking strength of the peripheral wall SW is weak, and the cover sheet is likely to tear in an unexpected direction when removed. If the size of DT is more than 1000 μm, the peripheral wall SW becomes hard and the wearer feels uncomfortable. It becomes easier to remember.

Although the peripheral wall portion SW has a cylindrical shape, it does not need to intersect perpendicularly to the surface of the core portion MC, and may be inclined to some extent (example: ±30° with respect to the vertical). Cylindrical (or cylindrical) refers to something that is elongated and hollow, and is tubular. The cylindrical shape may be curved or meandering as long as it extends along the thickness direction T, and the shape of the cross section perpendicular to the thickness direction T may be a circle, an ellipse, a polygon, or any other shape. They may have various shapes such as combinations, and the shape and area of the cross section perpendicular to the thickness direction T may not be constant in the thickness direction T.

In this embodiment, the planar shape of the peripheral wall portion SW has the shape of a ring surrounding the core portion MC with a generally uniform width DP, such as a circular ring, an elliptical ring, a rectangular ring, a rounded rectangular ring, a polygonal ring, etc. Examples include rings. In this embodiment, it is an elliptical ring. In the peripheral wall portion SW, there is little change in the width DP depending on the position of the ring, there is almost no sudden thinning or thickening in parts, and the shape is generally uniform. That is, the width DP (or wall thickness) of the peripheral wall portion SW in the in-plane direction is approximately uniform. However, "generally uniform" means that there is no part of the peripheral wall SW where the width DP is a small value of 1/2 or less of the average value, or a part where the width DP is a large value of more than twice the average value. . In addition, when the width DP is not constant in the thickness direction T, it is set as the width at the boundary between the ventral part 11 and the dorsal part 13. The width DP is, for example, 50 to 400 μm. When the width DP is less than 50 μm, the peripheral wall portion SW is too thin and easily breaks, and there is a risk that the joint portion 14a may be unintentionally peeled off during installation. When DP exceeds 400 μm, the peripheral wall portion SW is too thick, and there is a possibility that an uncomfortable feeling such as hardness may occur when the device is attached.

In the present embodiment, in the fused portion 30, when viewed from the thickness direction T (plan view), the area Sa of the peripheral wall portion SW is in the range of 5 to 60%, assuming that the area Sb of the core portion MC is 100%. It is within. The area Sa of the peripheral wall portion SW is preferably in the range of 5 to 55%, more preferably in the range of 5 to 50%, of the area Sb of the core portion MC. When the area Sa of the peripheral wall SW is less than 5%, the strength of the peripheral wall SW decreases, and there is a risk that the peripheral wall SW itself may break when the disposable diaper is removed. If the area Sa of the peripheral wall part SW exceeds 60%, the peripheral wall part SW will be too large and the wearer may feel uncomfortable, such as feeling stiff.

In this embodiment, as shown in FIG. 10, in the fused part row 30L, the plurality of fused parts 30 in the waist end region 21, the central region 22, and the leg end region 23 all have the same planar shape. have. Further, when each fused portion 30 is formed by the ultrasonic sealing method, the planar shape of the anvil convex portion 41 for each fused portion 30 is approximately the same as the planar shape of the core portion MC. However, in this embodiment, the planar shape of the convex portion 41 is an ellipse, but is not limited to this example, and examples thereof include a circle, a rectangle, a rounded rectangle, a polygon, and the like. Correspondingly, in this embodiment, the planar shape of the core portion MC is an ellipse, but is not limited to this example, and examples include a circle, a rectangle, a rounded rectangle, a polygon, and the like. The ellipse of the convex portion 41 (and core portion MC) has a dimension d21 (minor axis) in the vertical direction L<dimension d22 (long axis) in the horizontal direction W, and their size is, for example, 0.5 mm to 5 mm. Can be mentioned. The distance d23 (long span distance) between adjacent convex portions 41 in the longitudinal direction L is, for example, 1 mm to 30 mm. If each dimension is less than 0.5 mm, the welded part 30 is too small, and the joint part 14a may unintentionally peel off when worn. If it exceeds 5 mm, the welded part 30 is too large, and the wearer may There is a risk that you may feel uncomfortable, such as feeling hard.

By the way, when the above-mentioned disposable diaper 1 is removed from the wearer after use, the disposable diaper 1 is not removed while maintaining its original shape like taking off underwear, but the ventral part 11 and the dorsal part are removed at each of the joints 14a and 14b. Usually, the disposable diaper 1 is taken off by peeling off the parts 13 from each other. That is, the cover sheet 5 of the abdominal part 11 and the cover sheet 5 of the back part 13 are continuously peeled off from each other in the longitudinal direction L, and the disposable diaper 1 is taken off. In that case, in order to facilitate continuous peeling, it is necessary that each fused portion 30 be formed substantially homogeneously, or that the plurality of fused portions be formed substantially uniformly as a whole. is important.

The effects of the disposable diaper 1 having the above configuration will be explained with reference to FIGS. 9 and 11 to 13. FIG. 11 is a schematic diagram for explaining how the fused portion 30 is peeled off. 12 and 13 are schematic diagrams illustrating the state of the disposable diaper 1 after being peeled off.

First, as shown in FIG. 9, in the disposable diaper 1 of this embodiment, each fused portion 30 of the joint portion 14a (14b) has a core portion MC and a peripheral wall portion SW. In the peripheral wall part SW, the cover sheet 5 (ventral side sheet member) of the ventral side part 11 and the cover sheet 5 (dorsal side sheet member) of the dorsal side part 13 are melted, integrated in the thickness direction, and solidified. , formed into a cylindrical and wall-like shape. Therefore, the peripheral wall part SW is usually stronger and less likely to break than the cover sheet 5 of the ventral side part 11 or the dorsal side part 13 around it. Therefore, when the joint part 14a (, 14b) is peeled off, the peripheral wall part SW itself is difficult to break, and the cover sheet 5 of the ventral side part 11 or the dorsal part 13 around it is removed from the boundary part PB with the peripheral wall part SW or its surroundings. It is easy to break at the peripheral portion of the boundary portion PB (hereinafter simply referred to as “boundary portion PB”). Therefore, as shown in FIG. 9B and FIG. It can be easily peeled off at the boundary QB between the back side portion 13 and the cover sheet 5. Next, the fused portion 30 and its surroundings can be easily peeled off at the boundary portion PB of the cover sheet 5 of the ventral side portion 11 or the back side portion 13 with the fused portion 30 (the peripheral wall SW thereof). As a result, as shown in FIG. 11(a), for example, the fused part 30 remained on the cover sheet 5 of the ventral part 11, and the fused part 30 was removed from the cover sheet 5 of the dorsal part 13. The ventral side part 11 and the dorsal side part 13 of the joint part 14a (, 14b) can be easily and continuously peeled off from each other in the longitudinal direction L so that a hole is formed.
In the present embodiment, this form of peeling is also referred to as peeling of the fused portion 30, and the peel strength related to this peeling is referred to as the peel strength of the fused portion 30.

However, if the fusion of the fused portion 30 is incomplete, for example, if the width DP of the peripheral wall SW of the fused portion 30 is partially small, the peripheral wall SW becomes partially weak. Therefore, in the vicinity of the fused part 30, the rupture occurs not in the boundary part PB between the cover sheet 5 of the ventral part 11 and the dorsal part 13 and the peripheral wall part SW of the fused part 30, but in the peripheral wall part SW and the core part MC. and cracks are likely to occur. In this case, for example, as shown in FIG. 11(b), a crack KB that occurs in the peripheral wall SW of the fused part 30 during the peeling off of the joint part 14a (, 14b) may be caused in the ventral part 11 or the dorsal part. There is a possibility that it will spread to parts of the cover sheet 5 other than the joint parts 14a (, 14b) in the parts 13, for example, the central part of the ventral part 11 and the dorsal part 13, and the cover sheet 5 in the intermediate part 12. In that case, it becomes difficult to continuously peel off the ventral side part 11 part and the dorsal side part 13 part of the joint part 14a (, 14b) in the longitudinal direction L to the end, and it becomes necessary to repeat the peeling process many times. there is a possibility. Alternatively, the leakage prevention wall 6a may be tilted toward the crack that has developed to the central portion of the ventral side portion 11 or the dorsal side portion 13 or the cover sheet 5 in the intermediate portion 12, and the leakage prevention wall 6a may be surrounded by the pair of leakage prevention walls 6a, 6b. In addition, there is a possibility that the excrement may leak to the outside through the cracks from the area where the excrement is stored.

Therefore, the disposable diaper 1 of this embodiment further has the following configuration. First, each of the pair of leakage walls 6a, 6b of the absorbent main body 10 includes elastic members 8d, 8e having an effective length DE longer than the length DA of the absorbent body 4 in the longitudinal direction L. As a result, as shown in FIG. 12, by contraction of the elastic members 8d and 8e in the vertical direction L, each of the pair of leakage prevention walls 6a and 6b can be made to stand up very high. That is, the substantial height of each leakage prevention wall can be made very high. At the same time, the portions WA ₁ and WA ₂ located on the front and rear outer sides in the longitudinal direction L of the absorbent body 4 in the ventral side portion 11 and the back side portion 13 can be deformed into an upright shape. That is, not only the walls on both sides in the lateral direction W (leakage prevention walls 6a, 6b), but also the walls on both sides in the longitudinal direction L (parts WA ₁ and WA ₂ of the ventral part 11 and the dorsal part 13) are erected higher. As a result, a region capable of stably containing and holding a large amount of excrement, that is, a large-capacity storage region V can be formed.
As a result, even if a crack develops in the central part or intermediate part 12 of the ventral part 11 or the dorsal part 13 while peeling off the joints 14a and 14b, the storage area can be removed from the exposed skin side of the disposable diaper 1. It is possible to prevent V's excrement from leaking to the outside. In addition, even if the amount of excrement held in the storage area V is large and the disposable diaper 1 is tilted with respect to a horizontal surface (example: floor), the excrement may leak from the storage area V and the wearer's leg It is possible to prevent people from coming into contact with such things.
In addition, as shown in FIG. 13, after peeling off the joint parts 14a and 14b, a pair of leakage prevention walls 6a and 6a at ends 11e and 13e in the longitudinal direction L of the ventral part 11 and the dorsal part 13 are removed. By pulling the portions Z1 and Z2 between them to both outer sides in the longitudinal direction L, each of the pair of leakage prevention walls 6a and 6b can be brought closer to each other in the lateral direction W, and their relative distances can be shortened. That is, the pair of leak-proof walls 6a, 6b can be brought into contact with each other or overlapped with each other, so that at least a portion of the accommodation area V can be covered from the skin surface side by the pair of leak-proof walls 6a, 6b. Thereby, it is possible to prevent excrement in the storage area from coming into contact with the wearer's legs or falling onto the floor after the joints 14a and 14b are peeled off.
In the disposable diaper 1 having the joints 14a and 14b as described above, it is possible to suppress contamination caused by excrement held on the skin-side surface of the disposable diaper 1 when the disposable diaper 1 is removed.

<T-peel test of fused part>
The peel strength of the fused portion can be measured as follows.
(1) The area including a part of the joint part (including the ventral side cover sheet (ventral side sheet member) and the dorsal side cover sheet (dorsal side sheet member)) of the disposable diaper is It is cut out to a size of 50 mm in the direction W and used as a sample.
(2) Using a tester for a peel test, the ends of the ventral side cover sheet and the dorsal side cover sheet of the sample cut out on the same side in the lateral direction W (the center side of the disposable diaper before being cut out) The parts are gripped by two chucks (jigs) provided in the testing machine. However, the distance between the chucks when gripping (initial value) is set in advance to 30 mm.
(3) Using a test machine, pull the two chucks at a constant speed (example: 100 mm/min) so that the distance between the two chucks increases, and then pull the cover sheet on the ventral side of the joint and the cover on the dorsal side of the joint. While peeling the sheet in a 180° direction, the distance between the two chucks and the load F applied to the two chucks are measured.
(4) Measure the peel strength of the joint based on the relationship between the load F applied between the two chucks and the distance Dm between the two chucks. The maximum value of the measured load F is defined as the peel strength (N/25 mm). As a result, the peel strength with respect to the bonding by n fused portions 30 (example: n=6) included in a portion of the bonded portion having a length of 25 mm in the longitudinal direction L is measured. The peel strength between samples can be compared, for example, between n fused portions 30 (n is a natural number). Alternatively, the peel strength may be divided by the number n, approximately converted to the peel strength of one fused portion 30, and the peel strength may be compared between samples.

As a preferred aspect of this embodiment, in the disposable diaper 1, the effective length _DE of the elastic members 8d and 8e in the longitudinal direction L is 80% or more of the length _DK of the absorbent body 10. Therefore, the pair of leakage prevention walls 6a, 6b, that is, the walls on both sides in the lateral direction W in the accommodation area V, can be made to stand higher. Furthermore, the portions WA1 and WA2 located on both outer sides in the longitudinal direction L of the absorbent body 4 in the abdominal part 11 and the back part 13, that is, the walls on both sides in the longitudinal direction L can be made to stand up higher. Therefore, a large amount of excrement can be stored in the storage area V, that is, the capacity of the storage area V can be made larger. Thereby, leakage of excrement from the storage area V can be further suppressed during or after the joint portions 14a (, 14b) are peeled off.

As a preferable aspect of this embodiment, in the disposable diaper 1, the lower limit of the length from the free end FE to the fixed end SE in each of the pair of leakage walls 6a, 6b is 50 mm or more. Therefore, the required height for each of the pair of leakage prevention walls 6a, 6b can be secured. Furthermore, after peeling off the joint portions 14a (, 14b), each of the pair of leakage prevention walls 6a, 6b can ensure a necessary width to cover the upper part of the storage area V from the skin side. As a result, even after the joints 14a (, 14b) are peeled off, excrement leaks from the storage area V by covering the upper part of the storage area V with each of the pair of leakage prevention walls 6a and 6b (FIG. 13). You can control what you do. On the other hand, the upper limit of the length from the free end FE to the fixed end SE is 100 mm or less in order to prevent the wearer from feeling uncomfortable due to the pair of leakage walls 6a, 6b being too large.

As a preferred aspect of this embodiment, in the disposable diaper 1, the wall portions 64a, 64b of the pair of leakage prevention walls 6a, 6b stand up together with the inner portions of the base portions 63a, 63b in the lateral direction W, respectively, when worn. The walls 64a, 64b abut against the wearer's skin on the surface (skin side surface) opposite to the surface (non-skin side surface) facing the bases 63a, 63b. Further, when removed, one of the wall portions 64a, 64b can fall inward in the lateral direction W and come into contact with or overlap the other wall portions 64b, 64a facing each other in the lateral direction W. That is, at the time of removal, the storage area V can be covered from the skin side by the pair of walls 64a, 64b. Thereby, even when removing the joints 14a and 14b after peeling them off, it is possible to further prevent excrement in the accommodation area V from coming into contact with the wearer's legs or falling onto the floor.

As a preferable aspect of this embodiment, in the disposable diaper 1, the joint portion 61a (, 61b) connects the base portion 63a (, 63b) and the wall portion 64a (, 64b) at a position outside the connecting end CE in the lateral direction W. are partially combined. Thereby, in each of the pair of leakage prevention walls 6a, 6b, a convex portion 65a (, 65b) that is depressed when viewed from the outside in the lateral direction W, and therefore protrudes when viewed from the inside can be formed in the vicinity of the connecting end CE. . Due to the convex portions 65a (, 65b) that protrude when viewed from the inside, even if the disposable diaper 1 is tilted with respect to a horizontal surface (example: floor surface), the convex portions 65a (, 65b) are connected to the leakage prevention walls 6a, 6b. This serves as a kind of dam inside, and can prevent excrement from leaking to the outside from the inclined leakage walls 6a (6b). Therefore, even when the disposable diaper 1 is removed from a wearer who is lying down, for example, it is possible to further prevent excrement in the accommodation area V from coming into contact with the wearer's legs or falling onto the floor.

As a preferable aspect of the present embodiment, in the disposable diaper 1, the peel strength of each of the plurality of fused parts 30 in at least one of the waist side end region 21 and the leg side end region 23 is relatively high ( higher than the peel strength of each of the plurality of fused parts 30). Specifically, for example, the peel strength of the fused portion 30 is increased by increasing the basis weight of the cover sheet in areas where the peel strength is desired to be relatively increased. Therefore, for example, if the peel strength of the fused portion 30 of the leg side end region 23 is relatively high, when peeling off the joint portion 14a (, 14b) from the waist opening WO side, the waist side end region 23 From the region 21 to the central region 22, the cover sheet 5 of the ventral part 11 (ventral sheet member) and the cover sheet 5 of the dorsal part 13 (dorsal sheet member) are separated at once at or around each fused part 30. can. At the same time, when the separation is transferred from the central region 22 to the leg side end regions 23, the peel strength of the fused portion 30 increases, so that the cover sheet 5 of the ventral side portion 11 and the cover sheet 5 of the dorsal side portion 13 are separated. Separation can be stopped naturally. That is, a pause can be provided before the cover sheet 5 of the ventral side part 11 and the cover sheet 5 of the back side part 13 are separated in the leg side end region 23. As a result, by peeling off the entire joint 14a (, 14b) at once, the skin-side surface of the disposable diaper 1 is tilted and exposed vigorously, and excrement leaks from the leakage prevention wall 6a (, 6b). This situation can be suppressed. After that, the cover sheet 5 of the ventral side part 11 and the cover sheet 5 of the dorsal side part 13 are separated in the leg side end region 23 by changing the position where each cover sheet 5 is gripped or by slowing down the separation speed. By doing this carefully, even if the skin-side surface of the disposable diaper 1 is exposed, it is possible to prevent excrement from leaking from the leakage walls 6a (, 6b). The same applies when peeling off the bonded portion 14a (, 14b) from the leg opening LO side when the peeling strength of the fused portion in the waist side end region 21 is relatively high.

As a preferable aspect of this embodiment, in the disposable diaper 1, in at least one of the cover sheet 5 of the abdominal part 11 and the cover sheet 5 of the back part 13, at least the waist end region 21 and the leg end region 23 are The stress in the lateral direction W on one side is relatively large (larger than the stress in the lateral direction W in the central region 22). Specifically, for example, in a region where stress is desired to be increased, the stress is increased by increasing the number of elastic members extending in the lateral direction W, increasing the thickness, or increasing the elongation magnification. Thereby, for example, when the stress in the leg side end region 23 is relatively large, the following action can be taken when peeling off the joint portion 14a (, 14b) from the waist opening WO side. That is, after separating the cover sheet 5 of the ventral side part 11 and the cover sheet 5 of the back side part 13 from the waist side end area 21 to the center area 22 at once, the separation is performed before entering the leg side end area 23. Even if the joints 14a (, 14b) are partially peeled off when the diaper is stopped, the stress in the leg side end regions 23 allows the disposable diaper 1 to remain attached to the wearer. Thereby, when the separation is temporarily stopped, it is possible to prevent the partially separated disposable diaper 1 from slipping down from the wearer's waist and causing excrement to leak from the leakage walls 6a (, 6b). When the stress in the waist side end region 21 is relatively large, the same applies when peeling off the joint portion 14a (, 14b) from the leg opening LO side.

Next, a method of using the disposable diaper 1 according to this embodiment will be explained. FIG. 14 is a schematic diagram illustrating an example of a method for peeling off the joints 14a and 14b of the disposable diaper 1. When removing the disposable diaper 1 from the wearer, the removal is performed in the following manner. For example, in the first step, as shown in FIG. The cover sheet 5 on the ventral side part 11 and the cover sheet 5 on the dorsal side part 13 of the joint part 14a are continuously peeled off from each other in the longitudinal direction L. Then, when the end region is reached, peeling is not performed in the end region, and the film is temporarily stopped. Next, in the second step, as shown in FIG. 14(b), at the left joint portion 14b in the lateral direction W, from the waist side end region 21 of the start region to the leg side end region 23 of the end region. Then, the cover sheet 5 of the ventral side part 11 and the cover sheet 5 of the dorsal side part 13 of the joint part 14b are continuously peeled off from each other in the longitudinal direction L. Then, when the end region is reached, peeling is not performed in the end region, and the film is temporarily stopped. Note that the leg side end area 23 may be the starting area and the waist side end area 21 may be the ending area, or the left side joint 14b may be peeled off first and the right side joint 14a may be peeled off later. .

Next, in the third step, the central part in the horizontal direction W of the waist end region 21 in each of the ventral part 11 and the dorsal part 13 (the end in the longitudinal direction L of the ventral part 11 and the dorsal part 13 The portions Z1 and Z2) between the pair of leakage walls 6a and 6a in portions 11e and 13e are pulled apart from each other. Thereby, in the end area, the cover sheet 5 of the ventral part 11 and the cover sheet 5 of the dorsal part 13 at the right and left joints 14a and 14b in the lateral direction W are simultaneously and continuously in the longitudinal direction L. They are torn apart from each other all at once until the end. That is, as shown in FIG. 14(c), the cover sheet 5 of the ventral part 11 and the cover sheet 5 of the back part 13 at the joints 14a and 14b of the disposable diaper 1 are peeled off from each other, and the disposable diaper 1 is worn. It becomes possible for people to take off their clothes.

In the method of using this disposable diaper 1, first tear the joints 14a and 14b on the left and right sides separately, leaving a part open, and then grasp the waist end areas 21 on the front and rear sides and pull them all at once. The remaining left and right joints 14a and 14b are broken at the same time. Thereby, the leak-proof walls 6a (, 6b) can be easily removed from the wearer's body without tilting or shifting.
At this time, a possible method for peeling off the joints 14a and 14b is, for example, first peeling off all the joints 14a on the right side at once, and then peeling off all the joints 14b on the left side at once. However, in that case, when the right side joint 14a is peeled off, the disposable diaper 1 will tilt to the right, and the excrement will be biased to the right side, which may cause the excrement to leak from the right side leakage wall 6a. be.
However, in this method of use, for example, first the right joint is broken leaving a portion, and then the left joint 14b is broken leaving a portion. Therefore, at this stage, the disposable diaper 1 does not tilt to either the right or left side. Then, the remaining portions of the left and right joints 14a and 14b are simultaneously broken. Therefore, the disposable diaper 1 can be torn off at once without tilting.
As a result, it is possible to prevent the disposable diaper 1 from tilting, causing the excrement to become uneven, and thereby preventing the excrement from leaking from the leakage walls 6a (, 6b).

At this time, as described above, by relatively increasing the peel strength of each of the plurality of fused parts 30 in at least one of the waist side end region 21 and the leg side end region 23, the first , In the second step, it is possible to more easily temporarily stop the peeling off in the end area. Further, as described above, in at least one of the cover sheet 5 of the ventral part 11 and the cover sheet 5 of the dorsal part 13, the lateral direction W in at least one of the waist end region 21 and the leg end region 23 is By making the stress relatively high, it is possible to more easily temporarily stop the peeling off in the end region in the first and second steps in the above usage method.

Further, in another embodiment, in the fused portion row 30L, the shape of the plurality of fused portions 30 in the central region 22 and the leg side end region 23 is different from the shape of the plurality of fused portions 30 in the waist side end region 21. It may be different.

FIG. 15 is a plan view illustrating another configuration example of the plurality of fused parts 30 in the joint part 14a. FIG. 15(a) shows the fused parts 30a to 30c (fused part row 30L) viewed from the back side part 13 side in the thickness direction T, and FIG. 15(b) to (d) show the fused parts 30a to 30c (fused part row 30L). The shape and arrangement of convex portions 41a to 41c of an anvil in which portions 30a to 30c are formed by an ultrasonic sealing method are shown. In this embodiment, the fused portions 30a, 30b, and 30c of the waist end region 21, the central region 22, and the leg end region 23 have mutually different planar shapes. Therefore, when the fused parts 30a, 30b, and 30c are formed by the ultrasonic sealing method, the convex parts 41a, 41b, and 41c of the anvils for the fused parts 30a, 30b, and 30c are different from each other. The planar shape of the convex portion 41a of the anvil for forming the fused portion 30a of the central region 22 is a circle (perfect circle), and the dimension d11 in the vertical direction L=the dimension d12 in the horizontal direction W. Examples of d11 and d12 include 0.5 mm to 5 mm. The distance d13 (distance between centers of circles) between adjacent fused parts 30a in the longitudinal direction L is 1 mm to 30 mm. The planar shape of the convex part 41c of the anvil for forming the fused part 30c of the leg side end region 23 is a semicircular shape having a chord in the lateral direction W, and two protrusions are arranged close to each other in the lateral direction W. They are lined up. Therefore, compared to the protrusions 41a and 41b, each having one protrusion in the horizontal direction W, the fused part 30c, which is formed by two protrusions 41a in the transverse direction W, has a circumferential length equal to two welded parts. Therefore, it becomes relatively long. In other words, the peel strength of the fused portion 30 of the leg side end region 23 is relatively higher than that of the fused portions 30b and 30a of the central region 22 and the waist end region 21. The dimension d31 in the vertical direction L, the dimension d32 in the horizontal direction W, and the dimension d34 between both ends of the tip portions lined up in the horizontal direction W are, for example, 0.5 mm to 5 mm. The distance d33 (distance between centers of circles) between adjacent fused parts 30c in the longitudinal direction L is 1 mm to 30 mm.

FIG. 16 is a plan view showing an example of the configuration of the fused portion 30 in the joint portion 14a. FIG. 16(a) shows the fused portion 30a, and FIG. 16(b) shows the fused portion 30c. The fused portion 30b is the same as the fused portion 30 in FIG. Each of the fused parts 30a and 30c includes a core part MC and a peripheral wall part SW. The core part MC and the peripheral wall part SW are the same as the core part MC and the peripheral wall part SW of the fused part 30 in FIG. 8, except that the shape in plan view is different. However, since each fused portion 30c has two fused portions, the combined circumferential length of the two fused portions is relatively long, and the peel strength is relatively high. Further, as described above, it is not necessary that all the fused parts of the joint part 14a have the configuration of the fused part 30 and the fused parts 30a to 30c described above. For example, in the longitudinal direction L of the joint portion 14a, a portion within a range of at least 30% from the end edges 11ae, 13ae, which are the portions on the side of the waist opening WO side where tearing off (starts tearing) WO side ends 11e, 13e may have the above configuration. Similarly, in the longitudinal direction L of the joint 14a, at least 30% is from the end edge 11ae'13ae' which is the part on the side of the leg opening LO side where the peeling starts (the tearing starts). The part within the range may have the above configuration. In those cases, peeling can be easily initiated.

In a preferred aspect of the present embodiment, the peel strength of each of the plurality of fused parts 30 of the leg side end region 23 in the joint part 14a (, 14b) is equal to the peel strength of each of the plurality of fused parts 30 in the central region 22. higher than strength. Therefore, in the method for using the disposable diaper 1, when peeling is started from the waist end region 21, it is easier to temporarily stop the peeling at the end region in the first and second steps. can. Note that, for example, the fused portion 30a has two fused portions, the fused portions 30b and 30c each have one fused portion, and the circumferential length of the fused portion 30a is relatively long, making it difficult to peel. If the strength is relatively high, in the method for using the disposable diaper 1 described above, when peeling is started from the leg side end region 23, in the first and second steps, once the peeling is performed at the end region. Stopping can be done more easily.

The disposable diaper of the present invention is not limited to the embodiments described above, and combinations and changes can be made as appropriate without departing from the purpose and gist of the present invention. In other words, various techniques described in each embodiment can be applied to other embodiments as long as there is no conflict with each other.

1 Disposable diapers (absorbent articles)
4 Absorbent body 6a, 6b Leakage prevention wall 8d, 8e Elastic member 10 Absorbent main body 11 Ventral part 13 Dorsal part 11e, 13e End part 14a, 14b Joint part 30 Fusion part

Claims (9)

It has a longitudinal direction, a lateral direction, and a thickness direction that are perpendicular to each other, and has a ventral part including a ventral sheet member, a dorsal part including a dorsal sheet member, one end of which is connected to the ventral part, and the other end of which is connected to the ventral part. an absorbent main body that is connected to the dorsal side part and includes a top sheet, an absorbent body, and a back sheet in this order in the thickness direction, and An absorbent article including a joint portion in which both end portions are joined to each other in a state where they overlap in the thickness direction along the longitudinal direction,
The joint portion includes a plurality of fused portions spaced apart from each other along the longitudinal direction,
Each of the plurality of fused parts is
The ventral side sheet member and the dorsal side sheet member are fused to each other in the thickness direction, and the ventral side sheet member and the dorsal side sheet member are fused to each other in the thickness direction, and the ventral side sheet member and the dorsal side sheet member are fused to each other in the thickness direction. a core portion that is shifted toward the side portion and is located closer to the boundary than the end surface in the thickness direction of the ventral sheet or the dorsal sheet;
a peripheral wall portion in which the ventral sheet member and the dorsal sheet member are fused to each other in the thickness direction so as to extend cylindrically from the periphery of the core portion in the thickness direction;
including;
The absorbent main body includes a pair of leakage prevention walls that are arranged to face each other at both end portions in the lateral direction on the skin side and continuously extend along the longitudinal direction,
Each of the pair of leakage prevention walls is sheet-shaped and includes an elastic member disposed along the longitudinal direction,
The effective length of the elastic member functioning as an elastic body is longer than the length of the absorber in the longitudinal direction.
Absorbent articles. The effective length is 80% or more of the longitudinal length of the absorbent main body,
The absorbent article according to claim 1. Each of the pair of leakage walls is
a fixed end that is one edge in the lateral direction, which is fixed to the absorbent main body;
a free end that is not fixed to the absorbent main body and is the other edge in the lateral direction;
has
In the lateral direction, the length from the free end to the fixed end of each of the pair of leakage walls is 50 mm or more and 100 mm or less,
The absorbent article according to claim 1 or 2. Each of the pair of leakage walls is
a base portion having at least an outer edge fixed to the absorbent body in the lateral direction;
a wall portion whose inner edge is connected to the inner edge of the base in the lateral direction, whose outer edge is movable, and stands up when worn;
including,
The absorbent article according to any one of claims 1 to 3. located between the skin-side surface of the base and the non-skin-side surface of the wall, the inner edge of the base in the lateral direction and the inner edge of the wall in the lateral direction A connecting portion having a predetermined width shorter than the wall portion and the base portion in the horizontal direction and a predetermined length in the vertical direction from the connected connecting end, and partially connecting the base portion and the wall portion. ,
The absorbent article according to claim 4. The absorbent body has a central region located at the center in the vertical direction, and a front region and a rear region located in front and rear of the central region in the vertical direction,
the lateral width of the central region is narrower than the lateral widths of the front region and the rear region;
The absorbent article according to any one of claims 1 to 5. The absorbent article has a waist opening and leg openings,
The ventral side portion and the dorsal side portion include, in the longitudinal direction, a central region that is a central region, a waist side end region that is an end region on the side of the waist opening, and a waist side end region that is an end region on the side of the waist opening. It is divided into a leg side end region which is a side end region,
The peel strength of each of the plurality of fused parts in at least one of the waist side end region and the leg side end region in the joint part is greater than the peel strength of each of the plurality of fused parts in the central region. expensive,
The absorbent article according to any one of claims 1 to 6. In at least one of the ventral sheet member and the dorsal sheet member, the lateral stress in at least one of the waist end region and the leg end region is greater than the lateral stress in the central region. Also big,
The absorbent article according to claim 7. A method of using the absorbent article according to claim 7 or 8, comprising:
When the absorbent article is removed from the wearer, a starting region that is either one of the waist end region and the leg end region is separately provided at each of the right and left joints in the lateral direction. The ventral sheet member and the dorsal sheet member of the joint portion are continuously peeled off from each other in the longitudinal direction toward the other end region, and once the end region is reached, the method is stopped. step and
Stretching the lateral center portions of the waist end regions in each of the ventral and dorsal portions apart from each other, and forming the right and left joints in the lateral direction in the end region. simultaneously and continuously peeling off the ventral sheet member and the dorsal sheet member from each other in the longitudinal direction to the end;
Equipped with
How to use absorbent articles.

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