JP2020069168A - Absorbent article - Google Patents

Abstract

To suppress the generation of contamination due to excrement held on a skin side surface of an absorbent article when the absorbent article is removed.SOLUTION: An absorbent article 1 comprises an abdominal part 11, a back side part 13, and an absorbent body 10, and includes connection parts 14a and 14b in which end parts 11e and 13e in the lateral direction of the abdominal part and the back side part are overlapped in the thickness direction along the longitudinal direction and connected to each other. The connection part includes a plurality of fusion parts 30. The absorbent body includes an absorber 4, and a pair of leakage-preventing walls 6a and 6b arranged in both end parts in the lateral direction at the skin side, and continuously extending in the longitudinal direction. Each of the pair of leakage-preventing walls includes elastic members 8d and 8e arranged in the longitudinal direction. An effective length as a length allowing the elastic member to be functioned as an elastic body is longer than a length in the longitudinal direction of the absorber.SELECTED DRAWING: Figure 2

Description

  The present invention relates to absorbent articles.

  A ventral side portion and a back side portion are provided, and at least one end portion in the lateral direction of the ventral side portion and the back side portion is joined to each other in a state of overlapping in the thickness direction along the longitudinal direction. However, there is known an absorbent article (example: a pants-type disposable diaper) including a plurality of fusion bonded portions in which the joint portions are spaced apart from each other in the vertical 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 region and a densely welded region in the vertical direction, and the area of each welded part (fused part) of the densely welded region is the same as that of the loosely welded region. It is formed to be larger than the area of each welded portion (fused portion).

JP, 2013-146419, A

  When the absorbent article as disclosed in Patent Document 1 is used and removed from the wearer, a method of peeling the abdominal side sheet member and the dorsal side sheet member from each other is usually used at the joint portion. The method, specifically, the sheet member of the ventral side portion and the sheet member of the back side joined by a plurality of fusion bonding portions, by breaking the sheet member of each fusion bonding portion or its peripheral portion. , A method of continuously peeling each other in the longitudinal direction.

  Here, the absorbent article can hold a large amount of solid or semi-solid excrement such as stool (including loose stool) (hereinafter, also simply referred to as “excretion”), but the absorbent article has the same structure. It is difficult to absorb enough. Therefore, when excrement is held on the skin-side surface of the absorbent article, the absorbent article is usually replaced with the wearer standing. That is, when the wearer is standing, the abdominal sheet member and the dorsal sheet member joined by the plurality of fusion-bonding portions are continuously peeled from each other in the longitudinal direction at the joining portion.

  However, among the plurality of fused portions, if there is a fused portion that is not completely fused, a crack generated in the fused portion during the peeling of the joint portion, the ventral side or the dorsal side In some cases, it may progress to a sheet member in a portion other than the joint portion, such as a sheet member in the central portion. Then, it becomes difficult to continuously peel off the sheet member on the ventral side of the joint and the sheet member on the back side from each other in the longitudinal direction, and on the skin side of the absorbent article from the cracks developed in the sheet member in the central portion. It is possible that the surface may be exposed. Then, 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 fusion-bonded portion of the side seal portion (joint portion) is changed depending on the position of the fusion-bonded portion, but the above-described fusion-bonded portion is not completely formed. it's possible. Therefore, the above problem may occur similarly.

  Even when the joint is peeled off without cracking, when the amount of excrement discharged to the absorbent article is large, the excrement is exposed on the skin-side surface of the absorbent article. It is easy to become. Therefore, during or after peeling, the absorbent article may tilt with respect to the horizontal plane (example: floor surface), and excrement may move and contact the wearer's legs or fall onto the floor. is there.

  Therefore, it is an object of the present invention, in an absorbent article having a joint portion, when removing the absorbent article, it is possible to suppress the occurrence of contamination by the excrement retained on the skin-side surface of the absorbent article. To provide.

  The absorbent article of the present invention has (1) a vertical direction, a horizontal direction, and a thickness direction that are orthogonal to each other, an abdominal portion including a ventral sheet member, a back side portion including a back sheet member, and one end An absorptive main body that is connected to the abdominal side portion and the other end portion to the back side portion, respectively, and includes a top sheet, an absorber, and a back sheet in this order in the thickness direction, Absorbent article including a joint portion joined to each other in a state in which both lateral ends of the portion and the back side portion are overlapped in the thickness direction along the longitudinal direction, the joint portion is Includes a plurality of fusion-bonding portions arranged while being separated from each other along the longitudinal direction, each of the plurality of fusion-bonding portions, wherein the abdominal sheet member and the back-side sheet member are mutually in the thickness direction. A fused core portion and a cylindrical shape extending in the thickness direction from the periphery of the core portion. A peripheral wall portion in which the abdominal sheet member and the back sheet member are fused to each other in the thickness direction, and the absorbent main body faces each other at both lateral ends on the skin side. And includes a pair of leakproof walls continuously extending along the vertical direction, each of the pair of leakproof walls including an elastic member arranged along the vertical direction, The absorbent article, wherein the effective length of the member that functions as an elastic body is longer than the length of the absorbent body in the longitudinal direction.

In this absorbent article, the fusion-bonded portion of the joint portion includes the core portion and the peripheral wall portion. Due to the presence of the peripheral wall portion, the tensile strength of the fused portion can be increased, and the fused portion can be stabilized. As a result, it is possible to prevent the crack from propagating to the sheet member in the central portion at the time of peeling.
Further, each of the pair of leak preventive walls of the absorbent main body includes an elastic member having an effective length longer than the length of the absorber. By contracting the elastic member, each leak preventive wall can be erected to a very high level, and the abdominal part and the dorsal part are deformed to erected the parts located on both outer sides in the longitudinal direction of the absorber. Can be made That is, in addition to the walls on both sides in the horizontal direction (leak-prevention wall), the walls on both sides in the vertical direction (the abdominal side and the back side) are also erected high to stably store a large amount of excrement, A region that can be held, that is, a large-capacity storage region can be formed.
Thereby, even if a crack develops in the central portion in the middle of peeling off the joint portion, it is possible to prevent the excrement in the accommodation area from leaking 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 inclined with respect to the horizontal surface (example: floor surface), the excrement leaks from the storage area and contacts the wearer's legs, etc. Can be suppressed.
In addition to that, after peeling off the joint portion, by pulling the portion between the pair of leak preventive walls at both longitudinal edges of the ventral side portion and the dorsal side portion to both outer sides in the vertical direction L, Each of the pair of high-rise leak preventive walls can be brought laterally closer to each other to reduce their relative distance from each other. That is, at least a part of the accommodation area can be covered with the pair of leak preventive walls from the skin surface side so that the pair of leak preventive walls are in contact with or overlap with each other. Thereby, even after the joint portion is peeled off, it is possible to prevent the excrement in the storage area from coming into contact with the wearer's leg or the like or falling onto the floor.
Thus, in the absorbent article having the joint portion, when the absorbent article is removed, it is possible to suppress the contamination caused by the excrement held on the skin-side surface of the absorbent article.

The absorbent article according to the present invention is (2) the absorbent article according to (1) above, wherein the effective length is 80% or more of the length of the absorbent main body in the longitudinal direction. May be.
In this absorbent article, the effective length of the elastic member is 80% or more of the length of the absorbent main body. Therefore, the pair of leak-proof walls, that is, the walls on both sides in the lateral direction, are raised up higher, and the portions located on both outer sides of the absorbers on the ventral side and the back side, that is, the walls on both sides in the vertical direction are raised up higher. Can be made Therefore, a larger amount of excrement can be accommodated, and the capacity of the accommodating region can be increased. Thereby, it is possible to further suppress the excrement from leaking from the accommodation area during the peeling of the joint portion or even after the peeling.

In the absorbent article of the present invention, (3) each of the pair of leak-proof walls is fixed to the absorbent main body, and is fixed to the absorbent main body, which is one end edge in the lateral direction. And a free end that is the other edge in the lateral direction, and a length from the free end in each of the pair of leak-proof walls to the fixed end in the lateral direction is 50 mm. The absorbent article according to (1) or (2) above, which is 100 mm or less, may be used.
In this absorbent article, the length (lower limit) from the free end to the fixed end of the leak preventive wall is 50 mm or more. Therefore, it is possible to secure a necessary height as the rising height of each leak preventive wall, and a width required to cover the accommodation area from the skin surface side in each of the pair of leak preventive walls even after the joint is peeled off. Can be secured. This makes it possible to further suppress excrement from leaking from the storage area even after the joint is peeled off. On the other hand, the length (upper limit) from the free end to the fixed end of the leak preventive wall is 100 mm or less from the viewpoint of preventing the wearer from feeling uncomfortable because the leak preventive wall is too large.

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

The absorbent article of the present invention is (5) positioned between the skin-side surface of the base and the non-skin-side surface of the wall, and the lateral inner edge of the base and the wall. From the connecting end where the inner edge of the horizontal direction is connected, has a predetermined width shorter than the wall portion and the base portion in the horizontal direction and a predetermined length in the vertical direction, the base portion and the wall portion. The absorbent article according to (4) above, which includes a coupling part that partially couples and, may be used.
In the absorbent article, the joint part partially joins the base part and the wall part at a position outside the connecting end connecting the base part and the wall part in the lateral direction. Thereby, in each of the pair of leak preventive walls, a shape which is recessed when viewed from the outside in the lateral direction and therefore protruded when viewed from the inside can be formed. Even if the absorbent article tilts with respect to a horizontal plane (example: floor surface) due to the protrusion protruding from the inside, the protrusion becomes a kind of weir in the leak preventive wall, and the inclined leak preventive wall is directed outward. Leakage of excrement can be suppressed. Therefore, for example, even when the absorbent article is removed from a reclining wearer, it is possible to further suppress excrement in the storage area from coming into contact with the wearer's legs or the like or falling onto the floor.

In the absorbent article of the present invention, (6) the absorber has a central region located at the center in the vertical direction, and a front region and a rear region located at the front and the rear in the vertical direction of the central region. 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 width of the front region and the rear region. May be.
In the absorbent article, the lateral width of the central region of the absorbent body is narrower than the lateral width of the front region and the rear region, and thus the rigidity of the central region is low. Therefore, when the absorbent article is detached, the absorbent article bends due to the weight of the excrement and the central region droops largely, so that the leak preventive wall in the central region can be erected from the edge of the narrow absorbent body. That is, the height of the leak preventive wall in the central region can be substantially increased, and the capacity of the accommodation region can be increased. Thereby, it is possible to further suppress the 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.

(7) The absorbent article according to the present invention has (7) the absorbent article having a waist opening and a leg opening, and the ventral side portion and the back side portion are central regions in the longitudinal direction. Is divided into 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 side of the leg opening. The peel strength of each of the plurality of fusion-bonding portions of at least one of the waist-side end region and the leg-side end region in a portion is higher than the peeling strength of each of the plurality of fusion-bonding portions in the central region, The absorbent article according to any one of (1) to (6) above may be used.
In the absorbent article, the peel strength of each of the plurality of fused portions in at least one of the waist-side end region and the leg-side end region is relatively high. Thereby, for example, when the peel strength of the fusion-bonded portion of the leg side end region is relatively high, when peeling the joint from the side of the waist opening, from the waist side end region to the central region, The abdominal sheet member and the dorsal sheet member can be separated at a stretch at or near the fusion-bonded portion. At the same time, when the separation is moved from the central region to the leg-side end region, the peel strength of the fusion-bonded portion is increased, so that the separation between the abdominal sheet member and the back sheet member can be naturally stopped once. That is, a space can be provided before separating the abdominal sheet member and the back sheet member in the leg side end region. Thereby, it is possible to suppress a situation in which the skin-side surface of the absorbent article is tilted and exposed vigorously by peeling off the entire joint portion at once, and excrement leaks from the leak prevention wall. After that, the abdominal sheet member and the dorsal sheet member in the leg side end region are separated, by changing the position for gripping each sheet, or by slowing the speed of separation, by carefully performing, Even if the skin-side surface of the absorbent article is exposed, it is possible to prevent the excrement from leaking from the leak prevention wall. When the peel strength of the fusion-bonded portion in the waist-side end region is relatively large, the same is true when peeling the joint portion from the leg opening side.
As a method of increasing the peel strength, for example, a method of increasing the basis weight of at least one of the abdominal sheet member and the back sheet member to increase the thickness of the fused portion, or the core of each of the fused portions. Examples include a method of increasing the length of the circumference of the shape of the part (the convex portion 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 abdominal 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, which is larger than the stress in the lateral direction in the central region, may be used.
In the absorbent article, in at least one of the ventral side sheet member and the back side 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. Is becoming Thereby, for example, when the stress in the leg side end region is relatively large, when peeling the joint from the waist opening side, from the waist side end region to the central region, the abdominal side sheet member and the spine are removed. After separating the side sheet member at once, when the separation is temporarily stopped before entering the leg side end region, even if the joint part is partially peeled off, it is absorbed by the stress of the leg side end region. The state in which the wearer wears the sex article can be maintained. Accordingly, when the separation is temporarily stopped, it is possible to prevent a situation in which the partially separated absorbent article slides down from the waist of the wearer and the excrement leaks from the leak prevention wall. The same applies when peeling the joint from the side of the leg opening when the stress in the waist end region is relatively large.
As a method of increasing the stress, for example, a method of arranging a large number of elastic members extending in the lateral direction on the ventral side portion and the back side portion, or a method of adjusting the thickness or magnification of the elastic member can be mentioned. These methods can stably increase the stress.

The method of using the absorbent article of the present invention is (9) the method of using the absorbent article according to the above (7) or (8), wherein when the absorbent article is removed from a wearer, the absorbent article is used in the lateral direction. In each of the joints on the right side and the left side, separately from the start region which is one of the waist side end region and the leg side end region toward the end region which is the other, the joint part In the abdominal side sheet member and the back side sheet member, a step of continuously peeling them away from each other in the longitudinal direction and temporarily stopping when the end region is reached, and in each of the abdominal side portion and the back side portion The lateral center portions of the waist-side end regions are pulled apart from each other, and in the end region, the abdominal sheet member and the dorsal sheet member of the right and left joints in the lateral direction are pulled. And bets member, at the same time, and a step of peeling another until continuously Finally the vertical direction, the use of absorbent articles.
In the absorbent article, first, the abdominal sheet member and the dorsal sheet member are separated from each other from the start region to the end region at each of the right and left joints. Then, when the peeling reaches the end region, the peeling is temporarily stopped while leaving a part or the whole of the end region. Then, at the right and left joints, at the same time, the lateral center portions of the waist end regions are pulled so as to be separated from each other, and the abdominal sheet member and the dorsal sheet member are continuously longitudinally arranged. Peel each other until the end.
In this way, the left and right joints are breached separately, leaving a part first, and then the front and rear waist end regions are grasped and pulled at a stretch to remove the remaining left and right joints. Break at the same time. Thereby, the leakproof wall can be easily removed from the wearer's body without tilting or shifting.
At this time, as a method of peeling off the joint portion, for example, a method of first peeling off all the joint portions on the right side at once and then peeling off all the joint portions on the left side at once can be considered. However, in that case, when the right joint is peeled off, the absorbent article tilts to the right, the excrement is biased to the right, and the excrement may leak from the leak-proof wall on the right.
However, in the present method of use, for example, the left side joint part is first ruptured while leaving a part, and then the left side joint part is ruptured while leaving a part. Therefore, at this stage, the absorbent article does not lean to either the right side or the left side. Then, after that, the remaining left and right joints are simultaneously broken. Therefore, the absorbent article can be peeled off at a stretch without tilting.
As a result, it is possible to prevent the situation in which the absorbent article is tilted, the excrement is biased, and the excrement leaks from the leak prevention wall.

  ADVANTAGE OF THE INVENTION According to this invention, in the absorbent article which has a junction part, when removing an absorbent article, it becomes possible to suppress that contamination by the excrement hold | maintained at the skin side surface of an absorbent article occurs.

It is a perspective view showing the example of composition of the disposable diaper concerning an embodiment. It is a top view showing the deployment state of the example of composition of a disposable diaper. FIG. 3 is a sectional view taken along line III-III in FIG. 2. FIG. 4 is a sectional view taken along line IV-IV in FIG. 2. It is the schematic diagram which looked at the ventral side part and back side part of armor from the side of the edge part in a horizontal direction. It is a top view which shows the structural example of an absorptive main body. It is a top view which shows the structural example of the junction part in a disposable diaper. It is a schematic diagram explaining the formation method of a fusion bonding part. It is the top view and sectional perspective view which show the structural example of a fusion bonding part. It is a top view explaining the structural example of the some fusion bonding part in a joining part. It is a schematic diagram explaining the mode of peeling in a fusion bonding part. It is a schematic diagram explaining the state of the absorbent article after peeling. It is a schematic diagram explaining the state of the absorbent article after peeling. It is a schematic diagram explaining the peeling method of the junction part of an absorbent article. It is a top view explaining other examples of composition of a plurality of fusion bonding parts in a joined part. It is a top view which shows the other structural example of a fusion bonding part.

  Hereinafter, the absorbent article according to the embodiment of the present invention will be described by taking a pants-type disposable diaper (hereinafter, also simply referred to as “disposable diaper”) as an example. However, the present invention is not limited to the example, and can be applied to various absorbent articles without departing from the subject matter of the present invention. Examples of the absorbent article include so-called three-piece type and two-piece type disposable diapers.

  1 to 4 are views showing a disposable diaper 1 according to the present embodiment. 1 is a perspective view showing a configuration example of a disposable diaper 1, FIG. 2 is a plan view showing a state in which the disposable diaper 1 is unfolded, and FIG. 3 is a sectional view taken along line III-III in FIG. 4 is a sectional view taken along the line IV-IV in FIG. 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 line CL that extends through the center of the horizontal direction W and extends in the vertical direction L. The center axis CW extends in the lateral direction W through the center of the direction L. Here, the direction and the side toward the central axis CL are respectively inward and inward in the lateral direction W, and the direction and the side away are outward and outward in the lateral direction W, respectively. On the other hand, the direction and the side toward the central axis CW are defined as the inward direction and the inner side in the vertical direction L, and the direction and the side away from each other are the outward direction and the outer side in the vertical direction L, respectively. In addition, viewing the disposable diaper 1 placed on a plane in the thickness direction T from the vertically upper side of the plane is called "plan view", and the shape grasped in plan view is called "plan shape", which is the vertical direction. An arbitrary direction in the plane including L and the lateral direction W is referred to as "in-plane direction". “Skin side” and “non-skin side” mean the side relatively close to the wearer's skin surface and the side far away in the thickness direction T of the disposable diaper 1 when the disposable diaper 1 is worn. It should be noted 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 an abdominal part 11, a dorsal part 13, and an intermediate part 12 between the abdominal part 11 and the dorsal part 13. The abdominal part 11 is a part of the disposable diaper 1 that faces the abdomen of the wearer. The intermediate portion 12 is a portion of the disposable diaper 1 that faces the wearer's crotch portion. The back portion 13 is a portion of the disposable diaper 1 that faces the wearer's hip or back. The abdomen 11 and the back 13 are joined to each other by a pair of joints 14a and 14b located at both ends of the abdomen 11 and the back 13 in the lateral direction W. The joining portion 14a is in a state in which one end 11a in the lateral direction W of the ventral side portion 11 and one end 13a in the lateral direction W of the back side portion 13 overlap each other in the thickness direction T along the longitudinal direction L. Are joined to each other and formed. Similarly, in the joint portion 14b, the other end 11b of the ventral side portion 11 in the lateral direction W and the other end portion 13b of the back side portion 13 in the lateral direction W are arranged 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 wearer's waist passes is formed by the outer end 11e of the abdominal part 11 in the vertical direction L and the outer end 13e of the dorsal part 13 in the vertical direction L. Defined. Further, in the disposable diaper 1, the pair of leg openings LO, LO through which the legs of the wearer pass are defined by the side portions 12a, 12b on both sides of the intermediate portion 12 in the lateral direction W. The vertical direction, the horizontal direction, and the thickness direction of each joint 14a, 14b in the state shown in FIG. 1 are the same as the vertical direction L, the horizontal direction W, and the thickness direction T in the state shown in FIG. ..

  In the present embodiment, in the state shown in FIG. 2, the abdominal part 11 and the dorsal part 13 each have a rectangular shape that substantially extends in the lateral direction W, and are located apart from each other in the longitudinal direction L. The intermediate portion 12 is located between the ventral side portion 11 and the back side portion 13, and both side edges in the lateral direction W are recessed inward in the lateral direction W. The ventral side portion 11, the intermediate portion 12, and the back side portion 13 are integrally formed with each other. In another embodiment (not shown), the ventral portion 11, the intermediate portion 12 and the dorsal portion 13 are formed separately from each other.

  In the present embodiment, the disposable diaper 1 includes a plurality of elastic members 8a and 8b for waist gathers on the abdominal portion 11 and the back portion 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 vertical direction L of the abdominal portion 11, and are arranged at intervals in the vertical direction L. Has been done. Similarly, the plurality of elastic members 8b extend from one end 13a in the lateral direction W to the other end 13b along the end 13e in the longitudinal direction L of the back side portion 13 and are spaced from each other in the longitudinal direction L. It is placed vacant. The plurality of elastic members 8a and 8b expands and contracts the waist opening portion WO and is exemplified by a rubber thread.

  In the present embodiment, the disposable diaper 1 includes a plurality of elastic members 8c and 8c 'for leg gathers from the intermediate portion 12 to the back side portion 13 and the abdominal side portion 11. The plurality of elastic members 8c, 8c ′ extend along the lateral direction W at the center of the longitudinal direction L in the intermediate portion 12, reach both ends in the lateral direction W of the intermediate portion 12, and then along the longitudinal direction L. Then, they are continuously arranged at intervals so as to extend to the end portions 13a and 13b of the back side portion 13 and the end portions 11a and 11b of the abdominal side portion 11, respectively. The plurality of elastic members 8c and 8c 'expand and contract the pair of leg openings LO and LO, respectively, and are exemplified by a rubber thread.

  In this embodiment, the abdominal part 11, the intermediate part 12, and the back part 13 of the disposable diaper 1 are formed from a liquid-impermeable cover sheet (sheet member) 5. FIG. 5 is a schematic view of the ventral side portion 11 and the back side portion 13 as viewed from the end portion side in the lateral direction W. However, each cover sheet 5 is shown separately for the sake of clarity, and the 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 stacked in the thickness direction T and are joined to each other with an adhesive or the like. Both ends in the vertical direction L of the cover sheet 5b are folded back to the skin side so as to cover both ends in the vertical direction L of the cover sheet 5a. In that case, the cover sheet 5b at the folded position in the abdominal part 11 and the back part 13 constitutes the end part 11e of the abdominal part 11 and the end part 13e of the back part 13, respectively. The area A is an area where the cover sheet has three layers, and the area B is an area where the cover sheet has two layers. Therefore, the end part 11e of the abdominal part 11 and the end part 13e of the back part 13 have a three-layer structure in which three cover sheets 5b, 5a, and 5b are laminated. The length of each three-layer structure in the vertical direction L is, for example, 10 mm to 100 mm. In the present embodiment, the plurality of elastic members 8a, 8b, 8c, 8c 'are located between the cover sheets 5a and 5b. In this case, the plurality of elastic members 8a and 8b extend in the transverse direction W between the cover sheets 5a and 5b of the abdominal part 11 and the back part 13 from one side to the other side of the joint 14a and the joint 14b, respectively. It is provided so as to be lined up at intervals in the direction L, and is arranged so as to be in a predetermined expanded state in the expanded state of 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 of these, an SB nonwoven fabric, and an SMS nonwoven fabric. Examples of the material of the cover sheet 5 include polyolefin-based materials such as polypropylene and polyethylene. The basis weight of the cover sheet 5 is, for example, 5 to 100 g / m ² , and 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, the number of cover sheets 5 is one or two or more (not shown). In yet another embodiment, the cover sheet 5b is not folded back.

In the present embodiment, the disposable diaper 1 includes the absorbent main body 10 joined to the surface of the cover sheet 5 on the skin side. FIG. 6 is a plan view showing a configuration example of the absorbent main body 10. The absorbent main body 10 has a substantially rectangular shape, is located between the liquid-permeable topsheet 2, the liquid-impermeable backsheet 3, and the topsheet 2 and the backsheet 3, and absorbs the liquid. -The absorber 4 to hold | maintain is included. Examples of the surface sheet 2 include a liquid-permeable nonwoven fabric or woven fabric, a synthetic resin film having liquid-permeable holes formed therein, and a composite sheet of these. Examples of the back sheet 3 include liquid impermeable nonwoven fabrics, synthetic resin films, composite sheets of these, and SMS nonwoven fabrics. In the present embodiment, the absorber 4 includes an absorber core that absorbs and holds liquid, and a core wrap that encloses the absorber core. Examples of the absorber 4 include pulp fiber, synthetic fiber, absorbent polymer, and the like. The absorber 4 and the topsheet 2 and the backsheet 3 are joined with an adhesive, respectively, and the topsheet 2 and the backsheet 3 are joined with an adhesive at their peripheral portions. The adhesive may be a known material for disposable diapers, for example, a hot melt adhesive. The shape of the absorbent main body 10 is not limited to the above example as long as it is a shape that is long in the vertical direction L, and may be, for example, a rectangle with rounded corners, a rectangle with a convex curve outward on the short side, or an hourglass shape. The lower limit of the length D _K (the length between the edge 10e1 and the edge 10e2) of the absorbent main body 10 in the vertical direction L 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 the excrement in the absorbent main body 10 can be increased. Due to the structure of the product, the upper limit of the length D _K of the absorbent main body 10 in the vertical direction L is 100% of the length of the cover sheet 5. The lengths L of the cover sheet 5 and the absorbent main body 10 in the vertical direction shall be measured at the positions where the lengths D _{K of the} cover sheet 5 and the absorbent main body 10 in the vertical direction L are maximum, respectively.

The absorbent main body 10 includes a pair of leak preventive walls 6a and 6b. The pair of leak preventive walls 6a and 6b are arranged at both ends of the absorbent main body 10 in the lateral direction W on the skin side so as to face each other, and continuously extend along the longitudinal direction L. In the present embodiment, each of the pair of leak preventive walls 6a and 6b is formed of a hydrophobic sheet, for example, a hydrophobic non-woven fabric, but the present invention is not limited to this example, and may be formed of a hydrophilic sheet, for example, a hydrophilic non-woven fabric. Good. The lower limit of the length D _L in the vertical direction L of each of the pair of leak-proof walls 6a and 6b is, for example, 85% of the length D _{K in} the vertical direction L of the absorbent main body 10, and 90%. Is preferred, and 95% is more preferred. As a result, the region capable of accommodating excrement between the pair of leak preventive walls 6a and 6b can be expanded in the vertical direction L, and the accommodating capacity of excrement can be increased. The upper limit of the length D _L in the vertical direction L of each leak preventive wall is 100% due to the structure of the product. The length D _L of each of the pair of leakproof walls 6a and 6b in the vertical direction L is measured at a position where each of the pair of leakproof walls 6a and 6b includes elastic members 8d and 8e (described later).

  In the present embodiment, as shown in FIGS. 3 and 4, each of the pair of leak preventive walls 6a and 6b is fixed to the absorbent main body 10 and is a fixed end SE that is one end in the lateral direction W. , 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 leak prevention walls 6a and 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 in each leak preventing wall is substantially the height of each leak preventing wall. Here, the lower limit of the height of each leak preventive wall (the length from the fixed end SE to the free end FE measured along the surface of the sheet forming each leak preventive wall) is 50 mm and 60 mm. Is preferred, and a length of 70 mm is more preferred. Since the height of the pair of leak-proof walls 6a, 6b when standing up can be increased, the region capable of accommodating the excrement between the pair of leak-proof walls 6a, 6b can be expanded in the thickness direction T, and the excrement The storage capacity can be increased. The upper limit of the height of each leak preventive wall is 100 mm from the viewpoint of suppressing the discomfort that the wearer feels when wearing. The horizontal length W of each leak preventive wall is measured at a position where the length (width) of the absorbent body 4 in the horizontal direction W is maximum. Further, in the present embodiment, the fixed end SE is located at the both end edges of the absorbent body 4 in the lateral direction W or in the vicinity thereof (within the range of the area inside from the edge by the maximum thickness of the absorbent body 4). .. As a result, the length in the lateral direction W of the portion from the fixed end SE to the free end FE in each leak preventive wall can be effectively used for a long time, and thus the height of each leak preventive wall can be increased. In another embodiment, the fixed end SE is located above the skin-side surface of the absorber 4.

  In the present embodiment, the leak preventive wall 6a includes a base portion 63a and a wall portion 64a. The base 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 its inner edge connected to the inner edge of the base 63a, has its outer edge movable, and stands up when worn. Hereinafter, the common inner edge of the base portion 63a and the wall portion 64a is also referred to as a connecting end CE. The outer edge of the wall portion 64a is a free end FE. Then, in the present embodiment, a portion of the base portion 63a from the outer edge 6aE to the fixed end SE on the inner side of the edge 6aE is joined to the topsheet 2. Then, of the base portion 63a, the portion from the fixed end SE to the connecting end CE is not joined to the topsheet 2, and can be erected upward from the surface of the topsheet 2 with the fixed end SE as a base point in the thickness direction T. Has been formed. The wall portion 64a is formed such that the free end FE can stand upright in the thickness direction T with the connecting end CE as a base point. That is, the leak-proof wall 6a is formed so that the base portion 63a and the wall portion 64a can stand upright in the thickness direction T with the fixed end SE as a base point as a whole. Similarly, the leak preventive wall 6b includes a base portion 63b, a wall portion 64b, and an edge 6bE. The base 63b and the wall 64b (and the edge 6bE) are the same as the base 63a and the wall 64a (and the edge 6aE) except that they are line-symmetric with respect to the central axis CL. The leak-proof wall 6b is formed such that the base portion 63b and the wall portion 64b can be erected upward in the thickness direction T with the fixed end SE as a base point as a whole.

In the present embodiment, the leak preventive wall 6a includes a joint portion 61a located between the skin-side surface of the base 63a and the non-skin-side surface of the wall 64a. The connecting portion 61a has a predetermined width in the lateral 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 portion 63a and the inner edge of the wall portion 64a in the lateral direction W). Moreover, it has a predetermined length in the vertical direction L and partially connects the base portion 63a and the wall portion 64a. That is, the wall portion 64a is formed such that the connecting end CE is used as a base point and the wall portion 64a is easily opened outward from the base portion 63a, and thus the one surface 6aS of the wall portion 64a is easily oriented toward 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 coupling portion 61a in the vertical direction L is, for example, 10% to 90% of the length D _L of the leakproof wall in the vertical direction L, and preferably 20% to 80%. % To 70% is more preferred. When it is 10% or less, the surface 6aS of the wall portion 64a is difficult to face to the skin side, and when it is 90% or more, the leakproof wall 6a cannot be sufficiently erected. Similarly, the leak preventive wall 6b includes a coupling 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 connecting portion 61b is the same as the connecting portion 61a except that it is line-symmetric with respect to the central axis line CL. That is, the wall portion 64b is formed such that the connecting end CE serves as a base point and is easily opened outward from the base portion 63b, so that one surface 6bS of the wall portion 64b is easily oriented toward the skin side.

In the present embodiment, the leak preventive wall 6a includes an elastic member 8d arranged along the vertical direction L. The elastic member 8d expands and contracts the leak preventive wall 6a in the vertical direction L. In the present embodiment, as the elastic member 8d, a plurality of elastic members extend in the vertical direction L in the portion of the wall portion 64a near the free end FE and the portion of the base portion 63a near the connecting end CE and extend in the horizontal direction W. They are arranged side by side with an interval. For example, three elastic members are arranged in a portion of the wall portion 64a near the free end FE, and two elastic members are arranged in a portion of the base portion 63a near the connecting end CE. Similarly, the leakproof wall 6b includes an elastic member 8e arranged along the vertical direction L. The elastic member 8e is the same as the elastic member 8d except that it is line-symmetric with respect to the central axis CL.
As the elastic members 8d and 8e, for example, rubber thread is used, and they are arranged so as to be in a predetermined expanded state in the expanded state of FIG. By contracting the elastic members 8d and 8e in the vertical direction L, the pair of leakproof walls 6a and 6b can be contracted in the vertical direction, whereby the pair of leakproof walls 6a and 6b can be erected, and the pair of leakproof walls 6a. , 6b is formed with a storage area capable of storing excrement.

The effective length D _E as the length at which each of the elastic members 8d and 8e functions as an elastic body is longer than the length D _A of the absorbent body 4 in the vertical direction L. That is, D _A <D _E. However, the effective length D _E is a portion of the length of the elastic member excluding the length of the portion having no elasticity (eg, mainly both end portions) in a state where the elastic member is arranged in the disposable diaper 1. Is the length of. The non-elastic part is substantially elastic when the part itself does not have elasticity or when the elastic member is arranged in the disposable diaper 1 but the part itself has elasticity but is fixed by an adhesive or the like. Including the case where elasticity cannot be exerted. It should be noted that the portion having no elasticity means that the Young's modulus (stress / strain) of a portion of the elastic member, which straddles the central axis CW and has a length of 1/3 of the elastic member in a range line-symmetrical to the central axis CW. With reference to, a portion having Young's modulus of 3 times or more of the reference is meant. The Young's modulus can be measured by a method according to JIS K 6327 (or JIS K 6251). In the present embodiment, D _A <D _E in at least one of the plurality of elastic members as each of the elastic members 8d and 8e. The lower limit of the effective length D _E is preferably 105% of the length D _A of the absorbent body 4, more preferably 110%, and most preferably 120%. The upper limit of the effective length D _E is 130% of the length D _A of the absorbent body 4 in terms of the structure of the product. Thereby, the accommodating region for accommodating the excrement between the pair of leak preventive walls 6a, 6b can be deepened in the substantially thickness direction T, and the capacity of the excretable substance can be increased. The length D _A 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 the present embodiment, the lower limit of the effective length D _E of each of the elastic members 8d and 8e is, for example, 80% of the length D _K of the absorbent main body 10 in the longitudinal direction L, and the length of 85%. Is preferred, and a length of 90% is more preferred. It is possible to increase the volume of the storage area that can store the excrement between the pair of leak preventive walls 6a and 6b as described above. The upper limit of the effective length D _E is 100% due to manufacturing restrictions. The lower limit of the length D _M of the elastic members 8d and 8e in the vertical direction L is, for example, 85% of the length D _L of the absorbent main body 10 in the vertical direction L, and 90% of the length. Is preferable, and 95% is more preferable. This is because the effective length D _E of each of the elastic members 8d and 8e falls within the above-described predetermined range. Due to the structure of the product, the upper limit of the length D _M of each of the elastic members 8d and 8e is 100% of the length D _L of the absorbent main body 10.

In the present embodiment, the absorber 4 includes a central region K ₂ located at the center of the vertical direction L, a front region K ₁ and a rear region K ₃ located at the front and rear of the central region K _{2 in} the vertical direction L, respectively. Have. Here, the front region K ₁ corresponds to the front portions of the ventral side portion 11 and the intermediate portion 12, and the rear region K ₃ corresponds to the rear portions of the back side portion 13 and the intermediate portion 12. The width of the central region K _{2 in} the lateral direction W is narrower than the width of the front region K ₁ and the rear region K _{3 in} the lateral direction W. Thus, when the pair of leakage preventing walls 6a, 6b are erected, the central region K _2, a pair of leakage preventing walls 6a, 6b instead of rising from the fixed end SE, SE, from both edges of the absorbent body 4 You can stand up. That is, in addition to the pair of leak-proof walls 6a and 6b, the laminated portions GZ and GZ (FIG. 4) of the topsheet 2 and the backsheet 3 between both end edges of the absorber 4 and the fixed ends SE, SE also stand up. It will be different. As a result, it is possible to substantially increase the height of each leak preventive wall in the central region K2 where more excrement is excreted.

  Next, the structure of the joint portions 14a and 14b will be described. However, the joint portion 14a and the joint portion 14b have substantially the same configuration except for the difference between the left and right in the lateral direction W. Therefore, hereinafter, the configuration of the joint portion 14a will be mainly described, and the description of the configuration of the joint portion 14b will be omitted.

  FIG. 7: is a top view which shows typically the structural example of the junction part 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 the present embodiment, in the joint portion 14a, the outer edge 11ae in the vertical direction L of the end portion 11a in the ventral side portion 11 and the outer edge 13ae in the vertical direction L of the end portion 13a in the back side portion 13 are formed. It almost overlaps. The length L and the width W of the joint portion 14a are, for example, 50 to 250 mm and 3 to 20 mm, respectively. In another embodiment, the edge 11ae and the edge 13ae are displaced from each other in the vertical direction L by a predetermined length (example: 0.5 to 10 mm) (not shown).

  The joining portion 14a includes a plurality of fusion-bonding portions 30 arranged along the vertical direction L while being separated from each other. In this case, the end portion 11a and the end portion 13a are joined by at least a plurality of fusion bonding portions 30. The portion of the joint portion 14a where the fused portion 30 is not formed is not joined. In another embodiment, all or part of a portion of the joining portion 14a where the fusion-bonding portion 30 is not formed is joined with an adhesive (eg, hot-melt adhesive) (not shown).

  In the present embodiment, in the joint portion 14a, the plurality of fusion bonding portions 30 are arranged side by side along the longitudinal direction L with a space therebetween, thereby forming the fusion bonding portion row 30L. The fused portion row 30L is one row, and the distance between the fused portions 30 in the vertical direction L is constant. In another embodiment, all or a part of the fusion-bonding portion row 30L is a plurality of rows, and in the portion of the plurality of rows, the plurality of rows are arranged side by side in the lateral direction W (not shown). In still another embodiment, the spacing in the vertical direction L between the fused portions 30 in all or part of the fused portion row 30L differs depending on the position (not shown).

  In the present embodiment, the joint portion 14a includes, in the vertical 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 both regions. The waist-side end region 21 and the leg-side end region 23 are regions in the longitudinal direction L in the range of 1/8 to 1/3 of the joint portion 14a from the end edges of the waist opening WO and the leg opening LO, respectively. Yes, the central area 22 is the remaining area. The waist side end region 21 and the leg side end region 23 have the same length in the vertical direction L. In each region, the fused portions 30 are arranged with the same number of rows and the same intervals (with manufacturing error). In another embodiment, the waist-side end region 21 and the leg-side end region 23 have different lengths in the vertical direction L (not shown). In yet another embodiment, at least one of the size, spacing, and number of rows of fused portions 30 differs from other areas in at least one area (not shown).

  In the present embodiment, the plurality of elastic members 8a are provided between the cover sheets 5a and 5b of the abdominal side portion 11 so as to extend in the lateral direction W to the joint portions 14a and 14b and to be arranged in the longitudinal direction L with intervals. .. Similarly, the plurality of elastic members 8b are provided between the cover sheets 5a and 5b of the back side portion 13 so as to extend in the lateral direction W to the joint portions 14a and 14b and to be arranged in the longitudinal direction L at intervals. The plurality of elastic members 8a and 8b (and preferably also the elastic members 8c and 8c ') are arranged so as not to overlap the plurality of fusion bonding portions 30 in the thickness direction T at least at the joint portion 14a.

  In the present embodiment, at least one of the cover sheet 5 (abdominal sheet member) of the abdominal portion 11 and the cover sheet 5 (dorsal sheet member) of the back portion 13 has the elastic member 8a in the waist end region 21. The elastic force of 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 and 8b in the waist end region 21 is set to be larger than the number of elastic members 8a and 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. This allows the disposable diaper 1 to be temporarily held only by the fusion-bonded portion 30 of the waist-side end region 21 when the joint portion is peeled off from the leg-side end region 23. As a method of increasing the stress, not only a method of increasing the number of elastic members but also a method of adjusting the thickness or magnification of the elastic members can be mentioned. In another embodiment, the elastic force of the elastic members 8 a and 8 b of the leg side end regions 23 of at least one of the cover sheet 5 of the abdominal part 11 and the cover sheet 5 of the back part 13 is equal to that 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. This allows the disposable diaper 1 to be temporarily held only by the fusion-bonding portion 30 of the leg-side end region 23 when the joint portion is peeled off from the waist-side end region 21.

  In the present embodiment, the waist side end region 21 corresponds to the region A (FIG. 5) of the cover sheet 5 having three layers, the leg side end region 23 and the central region 22 have the cover sheet 5 of two layers. 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 fusion bonding portions 30 in the waist-side end region 21 of the joint portions 14a and 14b can be made higher than the peel strength of each of the plurality of fusion bonding portions 30 in the central region 22. Thereby, when peeling the joining portion from the side of the leg opening LO, when the peeling reaches the waist side end region 21, the peeling can be naturally and temporarily stopped. As a method of increasing the peel strength, not only a method of increasing the basis weight of the cover sheet 5 but also a method of increasing the number of fused portions, increasing the area, or increasing the circumferential length can be mentioned. Further, in another embodiment, the peel strength of each of the plurality of fusion bonding portions 30 in the leg side end regions 23 of the joint portions 14 a and 14 b is higher than the peel strength of each of the plurality of fusion bonding portions 30 in the central region 22. high.

  8 to 10 are diagrams schematically illustrating a configuration example of the fusion bonding section 30. FIG. 8 shows a method for forming the fusion-bonding portion 30, and FIG. 9 shows a configuration example of the fusion-bonding portion 30. In both cases, the cover sheet 5 has two layers of the leg-side end region 23 or the central region 22 (region B). Show. FIG. 10 shows a configuration example of the plurality of fusion bonding portions 30 of the joining portion 14a, FIG. 10 (a) shows the plurality of fusion bonding portions 30 viewed from the back side portion 13 side in the thickness direction T, and FIG. b) shows the shape and arrangement of the convex portion 41 of the anvil (or ultrasonic horn) that forms the fusion-bonded portion 30 by the ultrasonic sealing method.

  In the present embodiment, as shown in FIG. 8, a laminated body S of cover sheets 5a, 5b of both end portions 11a, 11b of the abdominal portion 11 and cover sheets 5a, 5b of both end portions 13a, 13b of the back portion 13 is formed. Are sandwiched between the ultrasonic horn 43 of the bond forming device and the convex portion 41 of the anvil. The cover sheet 5b, 5a, 5a, 5b is fused to each other by supplying predetermined ultrasonic energy to the sandwiched portion for a predetermined period, and has the core portion MC and the peripheral wall portion SW. The fused portion 30 is formed. The shape and the like of the core portion MC and the peripheral wall portion SW can be controlled by the amount of energy supplied from the bonding portion forming device, the timing and period of supply, and the like. Examples of such a bond forming device include the devices described in JP2004-298413A and JP2006-192902A. For example, by setting the transport speed lower than usual, making the energy higher than usual, or making the size of the convex portion 41 smaller than usual, the area where the fused portion of the cover sheet is to be formed is formed. By increasing the energy density per unit area to be supplied and using the energy efficiently, it is possible to control so that not only the tip of the convex portion 41 but also the periphery of the convex portion 41 can be provided with energy. .. Thereby, not only the core portion MC formed at the tip of the convex portion 41, but also the peripheral wall portion SW can be formed around the convex portion 41. 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. 9, the core portion MC of the fusion-bonded portion 30 has a plurality of cover sheets 5a and 5b of the abdominal side portion 11 and a plurality of cover sheets 5a and 5b of the back side portion 13 which are thick. It has a configuration in which they are fused together in the depth direction T. The core portion MC is formed by melting the plurality of cover sheets 5b, 5a, 5a, 5a, 5b in the thickness direction T while being melted by the energy of the ultrasonic horn, and then solidifying. Therefore, the thickness direction Very strong bond 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 (example: 200 to 5000 μm) in the thickness direction T in which the cover sheets 5b, 5a, 5a, 5b of the ventral side portion 11 and the back side portion 13 are simply laminated. If dT is less than 20 μm, the fusion between the cover sheets is not stable and holes are easily opened during fusion, and if it exceeds 500 μm, the fused portion is hard and the wearer feels uncomfortable.

  In the present embodiment, in the fusion-bonded portion 30, the position of the core portion MC in the thickness direction T deviates from the boundary between the ventral side portion 11 and the dorsal side portion 13 to the ventral side portion 11 or the dorsal side portion 13 side. 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. When the core portion MC is not flat, it is located at the center of the core portion MC in the thickness direction T at the connecting portion between the core portion MC and the peripheral wall portion SW in the vertical direction L. For example, in the example of FIG. 9B, the position of the core portion MC in the thickness direction T shifts to the side of the abdominal side 11, and is a position between the cover sheet 5a and the cover sheet 5b of the abdominal side 11. is there. The deviation in the thickness direction T from the boundary between the abdominal part 11 and the back part 13 is, for example, 10 to 500 μm. In another embodiment, the position of the end surface of the core portion MC in the thickness direction T coincides with the position of the end surface of the cover sheet 5 on the abdominal side portion 11 or the back side portion 13 in the thickness direction T.

  In the present embodiment, the peripheral wall portion SW of the fusion-bonded portion 30 surrounds the core portion MC and extends in a tubular shape in the thickness direction T from the peripheral edge of the core portion MC, so that the plurality of cover sheets 5a of the ventral side portion 11 are formed. 5b and the plurality of cover sheets 5a, 5b of the back side portion 13 are fused to each other in the thickness direction T. The peripheral wall portion SW has a plurality of cover sheets 5b, 5a, 5a, 5b dragged by the compression of the core portion MC and is slightly compressed in the thickness direction T, while the energy of the ultrasonic horn or the core portion MC is melted. It is formed by being solidified after being melted by heat. 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 size DT of the peripheral wall part SW is smaller than the size (example: 200 to 5000 μm) in the thickness direction T in which the cover sheets 5b, 5a, 5a, 5b of the abdominal part 11 and the back part 13 are simply laminated. However, since the peripheral wall portion SW is not pressed by the ultrasonic horn 43 or the convex portion 41 of the anvil, the size DT of the peripheral wall portion SW is larger than the size dT (example: 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 part SW is weak, and the cover sheet is easy to tear in an unexpected direction at the time of removal. If the size of DT exceeds 1000 μm, the peripheral wall part SW becomes hard and the wearer feels uncomfortable. Easy to remember

  The peripheral wall SW has a cylindrical shape, but it does not need to intersect the surface of the core MC perpendicularly, and may be inclined to some extent (example: ± 30 ° with respect to the vertical). The term “cylindrical (or tubular)” refers to a tubular shape that is elongated and hollow. The tubular 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 is a circle, an ellipse, a polygon, or the like. It may have various shapes such as a combination, 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 the present embodiment, the planar shape of the peripheral wall portion SW has a shape of a ring that surrounds the core portion MC with a substantially uniform width DP. For example, a circular ring, an elliptical ring, a rectangular ring, a rounded rectangular ring, or a polygonal shape. Examples include rings. In this embodiment, it is an elliptical ring. Further, in the peripheral wall portion SW, the width DP of the ring hardly changes depending on the position, and it does not almost suddenly become thinner or thicker, and has a substantially uniform shape. That is, the width DP (or wall thickness) of the peripheral wall portion SW in the in-plane direction is substantially uniform. However, “generally uniform” means that there is no portion of the peripheral wall SW where the width DP has a small value of ½ or less of the average value, or where the width DP has a large value of twice or more the average value. .. When the width DP is not constant in the thickness direction T, the width at the boundary between the abdominal part 11 and the back part 13 is set. 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 is easily broken, and the joint portion 14a may be unintentionally peeled off during mounting. When DP exceeds 400 μm, the peripheral wall portion SW is too thick, and there is a possibility that a discomfort such as hardness may occur during mounting.

  In the present embodiment, in the fusion-bonded portion 30, the area Sa of the peripheral wall portion SW when viewed from the thickness direction T (in plan view) is in the range of 5 to 60% when the area Sb of the core portion MC is 100%. Within. The area Sa of the peripheral wall portion SW is preferably 5 to 55% of the area Sb of the core portion MC, and more preferably 5 to 50%. When the area Sa of the peripheral wall portion SW is less than 5%, the strength of the peripheral wall portion SW is reduced and the peripheral wall portion SW itself may be broken when the disposable diaper is removed. If the area Sa of the peripheral wall portion SW exceeds 60%, the peripheral wall portion SW may be too large and the wearer may feel a sense of incongruity.

  In the present embodiment, as shown in FIG. 10, in the fusion-bonding portion row 30L, the plurality of fusion-bonding portions 30 in the waist-side end region 21, the central region 22, and the leg-side end region 23 all have the same planar shape. Have When each fusion-bonding part 30 is formed by the ultrasonic sealing method, the planar shape of the convex part 41 of the anvil for each fusion-bonding part 30 is substantially the same as the planar shape of the core part MC. However, in the present 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, and a polygon. Correspondingly, in the present embodiment, the planar shape of the core portion MC is an ellipse, but is not limited to this example, and examples thereof include a circle, a rectangle, a rounded rectangle, and a polygon. The ellipse of the convex portion 41 (and the core portion MC) is the dimension d21 (minor axis) in the vertical direction <dimension d22 (major axis) in the lateral direction W, and the size thereof is, for example, 0.5 mm to 5 mm. Can be mentioned. The distance d23 (major axis distance) between the adjacent convex portions 41 in the vertical direction L is, for example, 1 mm to 30 mm. If each dimension is less than 0.5 mm, the fused portion 30 is too small and the joint portion 14a may be unintentionally peeled off at the time of wearing. If it is more than 5 mm, the fused portion 30 is too large and the wearer is May feel a sense of incongruity such as hardness.

  By the way, when the above-mentioned disposable diaper 1 is removed from the wearer after use, the disposable diaper 1 is not removed by keeping its original shape so as to remove the underwear, but the abdominal part 11 and the dorsal side at each of the joints 14a, 14b. It is usual to remove the disposable diaper 1 by peeling off the part 13 and the part 13. That is, the cover sheet 5 of the abdominal part 11 and the cover sheet 5 of the back part 13 are continuously peeled from each other in the longitudinal direction L to remove the disposable diaper 1. In that case, in order to facilitate continuous peeling, it is necessary that the individual fusion-bonded portions 30 be formed substantially uniformly, or that the plurality of fusion-bonded portions be formed substantially uniformly as a whole. is important.

  Operational effects of the disposable diaper 1 having the above configuration will be described with reference to FIGS. 9 and 11 to 13. FIG. 11 is a schematic diagram for explaining the peeling state in the fusion-bonding part 30. 12 and 13 are schematic diagrams illustrating the appearance of the disposable diaper 1 after being peeled off.

First, as shown in FIG. 9, in the disposable diaper 1 of this embodiment, each fusion bonding part 30 of the bonding parts 14a (, 14b) has a core part MC and a peripheral wall part SW. In the peripheral wall portion SW, the cover sheet 5 (abdominal sheet member) of the abdominal portion 11 and the cover sheet 5 (dorsal sheet member) of the back portion 13 are melted and solidified while being integrated in the thickness direction. , Cylindrical and wall-shaped. Therefore, normally, the peripheral wall portion SW is stronger and less likely to be broken than the cover sheet 5 of the ventral side portion 11 or the back side portion 13 around the peripheral wall portion SW. Therefore, when the joining portion 14a (, 14b) is peeled off, the peripheral wall portion SW itself is less likely to break, and the cover sheet 5 of the abdominal side portion 11 or the back side portion 13 around the peripheral wall portion SW is the boundary portion PB with the peripheral wall portion SW or its periphery. The peripheral portion of the boundary portion PB (hereinafter, simply referred to as “boundary portion PB”) is easily broken. Therefore, as shown in FIGS. 9 (b) and 11 (a), when the joining portions 14a (, 14b) are peeled off, first, in the portion other than the fusion bonding portion 30, the cover sheet 5 of the abdominal side portion 11 is removed. It can be easily peeled off at the boundary QB between the back side portion 13 and the cover sheet 5. Then, the fusion-bonding part 30 and its periphery can be easily peeled off at the boundary portion PB with (the peripheral wall part SW of) the fusion-bonding part 30 in the cover sheet 5 of the abdominal part 11 or the back-side part 13. As a result, as shown in FIG. 11A, for example, the fused portion 30 remains on the cover sheet 5 of the abdominal portion 11, and the fused portion 30 is removed on the cover sheet 5 of the back portion 13. The ventral side portion 11 and the back side portion 13 of the joint portion 14a (, 14b) can be easily and continuously peeled from each other in the longitudinal direction L so that the hole is formed.
In addition, in this embodiment, such a peeling mode is also called peeling of the fusion bonding part 30, and the peeling strength related to the peeling is called peeling strength of the fusion bonding part 30.

  However, when the fusion bonding of the fusion bonding portion 30 is incomplete, for example, when the width DP of the circumferential wall portion SW of the fusion bonding portion 30 is partially small, the circumferential wall portion SW becomes partially weak. Therefore, in the vicinity of the fused portion 30, the peripheral wall portion SW or the core portion MC is broken not at the boundary portion PB between the cover sheet 5 of the abdominal portion 11 or the back portion 13 and the peripheral wall portion SW of the fused portion 30. And cracks easily occur. Then, for example, as shown in FIG. 11B, a crack KB generated in the peripheral wall portion SW of the fusion-bonded portion 30 during the peeling of the joint portion 14a (, 14b) may be a ventral side portion 11 or a back side portion. There is a possibility that the cover sheet 5 of the portion other than the joint portions 14a (, 14b) in 13 may spread to the cover sheet 5 of the middle portion 12 or the central portion of the abdominal portion 11 or the back portion 13, for example. In that case, it becomes difficult to peel off the abdominal part 11 part and the dorsal part 13 part of the joint part 14a (, 14b) continuously in the longitudinal direction L to the end, and it is necessary to repeat the peeling process many times. there is a possibility. Alternatively, the leak-proof wall 6a is inclined toward the crack that has propagated to the cover sheet 5 in the central portion of the abdominal portion 11 or the back portion 13 or the intermediate portion 12, and is surrounded by the pair of leak-proof walls 6a and 6b. Moreover, there is a possibility that the excrement leaks to the outside through the crack from the area containing the excrement.

Therefore, the disposable diaper 1 of the present embodiment further has the following configuration. First, each of the pair of leak preventive walls 6a and 6b of the absorbent main body 10 includes elastic members 8d and 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, the elastic members 8d and 8e contract in the vertical direction L, so that each of the pair of leakproof walls 6a and 6b can be erected extremely high. That is, the substantial height of each leak preventive wall can be made very high. Along with that, the portions WA ₁ and WA ₂ located on the front side and the rear side of the absorbent body 4 on the front side and the rear side of the abdominal portion 11 and the back portion 13 can be deformed to a standing shape. That is, not only the walls on both sides in the lateral direction W (leak-proof walls 6a, 6b) but also the walls on both sides in the vertical direction L (portions WA ₁ and WA _{2 of the} ventral side portion 11 and the back side portion 13) stand up high. As a result, a region in which a large amount of excrement can be stably stored and held, that is, a large-capacity storage region V can be formed.
As a result, even if a crack develops in the central portion or the intermediate portion 12 of the abdominal portion 11 or the back portion 13 during the peeling of the joint portions 14a and 14b, the exposed region of the disposable diaper 1 on the skin side is not covered with the accommodating region. It is possible to suppress the excretion of V from leaking to the outside. In addition to that, even when the amount of excrement retained in the storage area V is large and the disposable diaper 1 is inclined with respect to a horizontal plane (example: floor surface), the excrement leaks from the storage area V and the legs of the wearer. It is possible to suppress contact with the like.
In addition to that, as shown in FIG. 13, after peeling off the joint portions 14a and 14b, the pair of leak-proof walls 6a and 6a at the end portions 11e and 13e in the longitudinal direction L of the abdominal portion 11 and the back portion 13 are formed. By pulling the portions Z1 and Z2 between both sides in the vertical direction L, it is possible to bring the pair of leakproof walls 6a and 6b closer to each other in the horizontal direction W and to reduce their relative distances. That is, at least a part of the accommodation area V can be covered from the skin surface side with the pair of leak-proof walls 6a, 6b such that the pair of leak-proof walls 6a, 6b are in contact with or overlap with each other. Thereby, it is possible to prevent the excrement in the accommodation area from coming into contact with the legs of the wearer or falling onto the floor after the joint portions 14a and 14b are peeled off.
As described above, in the disposable diaper 1 having the joint portions 14a and 14b, it is possible to suppress the occurrence of contamination by the excrement held on the skin-side surface of the disposable diaper 1 when the disposable diaper 1 is removed.

<T-type peeling test of fused portion>
The peel strength of the fused portion can be measured as follows.
(1) A portion including a part of a joint portion (including a ventral side cover sheet (abdominal sheet member) and a dorsal side cover sheet (dorsal sheet member)) in the disposable diaper, the longitudinal direction L25 mm × width The sample is cut out in a size of W50 mm in the direction.
(2) Using a testing machine for peeling test, the ends of the cut-out sample on the same side in the lateral direction W (the central side of the disposable diaper before being cut out) in the ventral side cover sheet and the back side cover sheet The parts are respectively held by two chucks (jigs) provided in the testing machine. However, the distance (initial value) between the chucks when gripping is set to 30 mm in advance.
(3) With a tester, pull the two chucks at a constant speed (example: 100 mm / min) so that the distance between the two chucks is widened, and the cover sheet on the ventral side of the joint and the cover on the back side. The distance between the two chucks and the load F applied to the two chucks are measured while peeling the sheet in the 180 ° direction.
(4) The peel strength of the bonded portion is measured 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 for the joining by the n fusion-bonded portions 30 (example: n = 6) included in the portion of the joining portion in the vertical direction L25 mm is measured. The peel strengths of the samples can be compared with each other, for example, by n (where n is a natural number) fused portions 30. Alternatively, the peel strength may be divided by the number n and converted into the peel strength of one fused portion 30 to compare the peel strength between the samples.

As a preferable mode in this embodiment, in the disposable diaper 1, the effective length D _E of the elastic members 8d and 8e is 80% or more of the length D _K of the absorbent main body 10 in the longitudinal direction L. Therefore, the pair of leakproof walls 6a and 6b, that is, the walls on both sides in the lateral direction W in the accommodation area V can be raised up higher. Furthermore, the portions WA1 and WA2 located on both outer sides in the vertical direction L of the absorbent body 4 in the abdominal side portion 11 and the back side portion 13, that is, the walls on both sides in the vertical direction L can be raised 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 increased. Thereby, it is possible to further suppress the excrement from leaking from the storage area V during or after the peeling of the joint portion 14a (, 14b).

  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 is 50 mm or more in each of the pair of leakproof walls 6a and 6b. Therefore, it is possible to secure the required height as the height of each of the pair of leak preventive walls 6a and 6b. Further, after peeling off the joint portion 14a (, 14b), a necessary width can be secured as a width for covering the upper side of the accommodation area V from the skin surface side by each of the pair of leakproof walls 6a, 6b. Thereby, even after the joint portion 14a (, 14b) is peeled off, by covering the upper part of the storage area V with each of the pair of leak prevention walls 6a, 6b (FIG. 13), excrement leaks from the storage area V. Can be further suppressed. 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 from the viewpoint of preventing the wearer from feeling uncomfortable due to the pair of leakproof walls 6a and 6b being too large.

  As a preferable aspect of the present embodiment, in the disposable diaper 1, the wall portions 64a and 64b of the pair of leakproof walls 6a and 6b stand up together with the inner portions of the base portions 63a and 63b in the lateral direction W when worn. The walls 64a and 64b contact the wearer's skin on the surface (skin side) opposite to the surface (non-skin side) facing the bases 63a and 63b. Further, one of the wall portions 64a and 64b can fall inward in the lateral direction W and come into contact with or overlap the other opposing wall portions 64b and 64a in the lateral direction W when removed. That is, at the time of removal, the accommodation area V can be covered from the skin surface side with the pair of wall portions 64a and 64b. Accordingly, even when the joint portions 14a and 14b are detached after being peeled off, it is possible to further suppress the excrement in the storage area V from coming into contact with the legs of the wearer or falling onto the floor.

  As a preferable mode in the present embodiment, in the disposable diaper 1, the coupling portion 61a (, 61b) is located outside the connecting end CE in the lateral direction W, and the base portion 63a (, 63b) and the wall portion 64a (, 64b) are provided. Are partially combined. Thereby, in each of the pair of leak prevention walls 6a and 6b, in the vicinity of the connecting end CE, a convex portion 65a (, 65b) that is recessed when viewed from the outside in the lateral direction W and thus protruded when viewed from the inside can be formed. .. Even if the disposable diaper 1 is tilted with respect to a horizontal plane (example: floor surface), the convex portions 65a (, 65b) have a pair of leakproof walls 6a, 6b due to the convex portions 65a (, 65b) protruding from the inside. It becomes a kind of weir inside, and it is possible to suppress the leakage of excrement from the inclined leak preventive wall 6a (, 6b) to the outside. Therefore, for example, even when the disposable diaper 1 is removed from a reclining wearer, it is possible to further suppress excrement in the storage area V from coming into contact with the wearer's legs or the like 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 fusion bonding portions 30 in at least one of the waist side end region 21 and the leg side end region 23 is relatively high (in the central region 22). It is higher than the peel strength of each of the plurality of fusion bonded portions 30). Specifically, for example, the peel strength of the fusion-bonded part 30 is increased by increasing the basis weight of the cover sheet in the region where the peel strength is desired to be relatively increased. Thus, for example, when the peel strength of the fusion-bonded portion 30 of the leg-side end region 23 is relatively high, when the joining portion 14a (, 14b) is peeled off from the waist opening WO side, the waist-side end portion is removed. From the region 21 to the central region 22, the cover sheet 5 (abdominal sheet member) of the abdominal part 11 and the cover sheet 5 (dorsal sheet member) of the dorsal part 13 are separated at each fusion portion 30 or its periphery at once. it can. At the same time, when the separation is transferred from the central region 22 to the leg-side end region 23, the peel strength of the fusion-bonded portion 30 increases, so that the cover sheet 5 of the abdominal part 11 and the cover sheet 5 of the back part 13 are separated. Separation can be stopped naturally. That is, a space can be provided before the cover sheet 5 of the abdominal part 11 and the cover sheet 5 of the back part 13 in the leg-side end region 23 are separated. Thereby, by peeling off the entire joint portion 14a (, 14b) all at once, the skin side surface of the disposable diaper 1 is inclined and exposed vigorously, and excrement leaks from the leak preventive wall 6a (, 6b). It is possible to suppress the situation. After that, in the separation of the cover sheet 5 of the abdominal part 11 and the cover sheet 5 of the back part 13 in the leg-side end region 23, the position for gripping each cover sheet 5 is changed or the separation speed is slowed. By doing so carefully, even if the skin-side surface of the disposable diaper 1 is exposed, it is possible to prevent the excrement from leaking from the leak-proof wall 6a (6b). The same applies when the peeling strength of the fusion-bonded portion of the waist-side end region 21 is relatively large and the joining portion 14a (, 14b) is peeled from the leg opening LO side.

  As a preferable aspect of the present embodiment, in the disposable diaper 1, at least one of the cover sheet 5 of the abdominal part 11 and the cover sheet 5 of the back part 13 has at least the waist end region 21 and the leg end region 23. 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, and increasing the expansion ratio. Thus, for example, when the stress in the leg-side end region 23 is relatively large, the following action can be performed when the joining portion 14a (, 14b) is peeled off from the waist opening WO side. That is, after separating the cover sheet 5 of the abdominal side portion 11 and the cover sheet 5 of the back side portion 13 from the waist side end region 21 to the central region 22 at a stretch, they are separated before entering the leg side end region 23. Even when the joint portions 14a (, 14b) are partially peeled off when the suspension is once stopped, the state in which the disposable diaper 1 is worn by the wearer can be maintained due to the stress in the leg side end regions 23. Therefore, when the separation is temporarily stopped, it is possible to prevent the disposable diaper 1 that has been separated halfway from sliding down from the waist of the wearer and leaking excrement from the leak preventive wall 6a (6b). When the stress in the waist-side end region 21 is relatively large, the same is true when the joining portions 14a (, 14b) are peeled off from the leg opening LO side.

  Next, a method of using the disposable diaper 1 according to this embodiment will be described. FIG. 14: is a schematic diagram explaining an example of the peeling method of the junction parts 14a and 14b of the disposable diaper 1. As shown in FIG. When removing the disposable diaper 1 from the wearer, it is removed by the following method. For example, first, in the first step, as shown in FIG. 14A, in the right side joint portion 14a in the lateral direction W, the waist side end region 21 of the start region to the leg side end region 23 of the end region. The cover sheet 5 on the ventral side portion 11 and the cover sheet 5 on the back side portion 13 of the joint portion 14a are continuously peeled away from each other in the vertical direction L toward the front side. Then, when the end area is reached, the end area is not peeled off and is temporarily stopped. Next, in the second step, as shown in FIG. 14B, in the left joint portion 14b in the lateral direction W, the waist side end region 21 of the start region is moved to the leg side end region 23 of the end region. Then, the cover sheet 5 on the ventral side portion 11 and the cover sheet 5 on the back side portion 13 of the joint portion 14b are continuously peeled from each other in the vertical direction L. Then, when the end area is reached, the end area is not peeled off and is temporarily stopped. The leg-side end region 23 may be used as the start region and the waist-side end region 21 may be used as the end region, or the left joint portion 14b may be peeled off first and the right joint portion 14a may be peeled later. ..

  Next, in a third step, a central portion in the lateral direction W of the waist-side end region 21 in each of the ventral side portion 11 and the dorsal side portion 13 (ends in the longitudinal direction L of the ventral side portion 11 and the dorsal side portion 13). The portions Z1 and Z2 between the pair of leak preventive walls 6a and 6a in the portions 11e and 13e are pulled so as to be separated from each other. Thereby, in the end region, the cover sheet 5 of the ventral side portion 11 and the cover sheet 5 of the back side portion 13 at the right and left joints 14a and 14b in the horizontal direction W are simultaneously and continuously provided in the vertical direction L. They are pulled apart from each other all at once until the end. That is, as shown in FIG. 14 (c), the cover sheet 5 of the abdominal part 11 and the cover sheet 5 of the back part 13 of the joints 14 a and 14 b of the disposable diaper 1 are separated from each other, and the disposable diaper 1 is worn. The person can undress.

In this method of using the disposable diaper 1, first, the left and right joints 14a and 14b are ruptured separately leaving a part thereof, and then the front and rear waist side end regions 21 are grasped and pulled at a stretch. The remaining left and right joints 14a, 14b are broken at the same time. As a result, the leakproof wall 6a (, 6b) can be easily removed from the wearer's body without tilting or shifting.
At this time, as a method of peeling off the joint portions 14a and 14b, for example, a method of first peeling off the right joint portion 14a all at once and then peeling off all the left joint portion 14b at once can be considered. However, in that case, the disposable diaper 1 tilts to the right when the right joint 14a is peeled off, and the excrement is biased to the right, and the excrement may leak from the leak-proof wall 6a on the right. is there.
However, in this method of use, for example, the right side joint portion is first ruptured leaving a part thereof, and then the left side joint portion 14b is ruptured leaving a part thereof. Therefore, at this stage, the disposable diaper 1 does not lean to the right side or the left side. Then, after that, the remaining portions of the left and right joints 14a and 14b are simultaneously broken. Therefore, the disposable diaper 1 can be peeled off at a stretch without tilting.
As a result, it is possible to prevent the situation in which the disposable diaper 1 is tilted, the excrement is biased, and the excrement leaks from the leak preventive wall 6a (, 6b).

  At this time, as described above, the peel strength of each of the plurality of fusion bonding portions 30 in at least one of the waist-side end region 21 and the leg-side end region 23 is relatively increased, so that the first in the above-described method of use. In the second step, the peeling off in the end region can be more easily stopped once. Further, as described above, in at least one of the cover sheet 5 of the abdominal part 11 and the cover sheet 5 of the back part 13, the lateral direction W in at least one of the waist side end region 21 and the leg side end region 23 is increased. By relatively increasing the stress, it is possible to more easily temporarily stop the peeling in the end region in the first and second steps of the above-described method of use.

  As another embodiment, in the fusion-bonding portion row 30L, the shapes of the fusion-bonding portions 30 in the central region 22 and the leg-side end regions 23 are the same as the shapes of the fusion-bonding portions 30 in the waist-side end region 21. May differ from.

  FIG. 15 is a plan view illustrating another configuration example of the plurality of fusion bonding parts 30 in the bonding part 14a. FIG. 15A shows the fusion-bonded portions 30a to 30c (fusion-bonded portion row 30L) viewed from the back side portion 13 side in the thickness direction T, and FIGS. The shape and arrangement of the convex portions 41a to 41c of the anvil that form the portions 30a to 30c by the ultrasonic sealing method are shown. In the present embodiment, the fusion-bonded portions 30a, 30b, and 30c of the waist-side end region 21, the central region 22, and the leg-side end region 23 have mutually different planar shapes. Therefore, when the fusion-bonded portions 30a, 30b and 30c are formed by the ultrasonic sealing method, the convex portions 41a, 41b and 41c of the anvils for the fusion-bonded portions 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 (a 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 the centers of circles) between the fusion-bonded portions 30a adjacent to each other in the vertical direction L is 1 mm to 30 mm. The planar shape of the convex portion 41c of the anvil for forming the fusion-bonded portion 30c of the leg-side end region 23 is a semicircular shape having a chord in the lateral direction W, and the two in the lateral direction W are close to each other. Lined up. Therefore, as compared with the convex portions 41a and 41b provided one by one in the lateral direction W, the fusion portion 30c formed by the two convex portions 41a in the lateral direction W has a circumference of two fusion portions. Therefore, it becomes relatively long. In other words, the peel strength of the fusion-bonded portion 30 of the leg-side end region 23 is relatively higher than that of the fusion-bonded portions 30b and 30a of the central region 22 and the waist-side end region 21. Examples of 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 arranged in the horizontal direction W include 0.5 mm to 5 mm. The distance d33 (distance between centers of circles) between the fused portions 30c adjacent to each other in the vertical direction L is 1 mm to 30 mm.

  FIG. 16 is a plan view showing an example of the configuration of the fusion bonding portion 30 in the joining portion 14a. 16A shows the fused portion 30a, and FIG. 16B shows the fused portion 30c. The fusing part 30b is the same as the fusing part 30 of FIG. Each of the fusion bonding 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 fusion bonding part 30 of FIG. 8 except that the shapes in plan view are different. However, since the fusion-bonded portions 30c have two fusion-bonded portions, the peripheral length of the two fusion-bonded portions is relatively long and the peel strength is relatively high. Further, as described above, it is not necessary that all the fusion-bonded portions of the joining portion 14a have the above-described fusion-bonded portions 30 and the fusion-bonded portions 30a to 30c. For example, in the vertical direction L of the joint portion 14a, a portion within a range of at least 30% from the end edges 11ae and 13ae which are portions on the side of the end portions 11e and 13e on the side of the waist opening WO that starts peeling (begins to tear). May have the above configuration. Similarly, in the longitudinal direction L of the joint portion 14a, at least 30% from the end edges 11ae 'and 13e' on the side of the end portions 11e 'and 13e' on the side of the leg opening LO that starts peeling (begins to tear). The portion 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 fusion bonding portions 30 in the leg side end region 23 of the joint portion 14a (, 14b) is the same as that of each of the plurality of fusion bonding portions 30 in the central region 22. Higher than strength. Therefore, in the method for using the disposable diaper 1 described above, when the peeling is started from the waist side end region 21, in the first and second steps, it is possible to easily stop the peeling in the end region. it can. Note that, for example, the number of the fusing parts of the fusing part 30a is two, and the number of the fusing parts of the fusing parts 30b and 30c is one each, and the peripheral length of the fusing part 30a is relatively long, and peeling is performed. When the strength is relatively high, in the method of 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 peeling is performed in the end region. Stopping can be done more easily.

  The disposable diaper of the present invention is not limited to the above-mentioned respective embodiments, and can be appropriately combined and changed without departing from the purpose and the spirit of the present invention. That is, the various techniques described in each embodiment can be applied to other embodiments as long as they do not conflict with each other.

1 Disposable diapers (absorbent articles)
4 Absorbers 6a, 6b Leakage barriers 8d, 8e Elastic member 10 Absorbent body 11 Abdominal part 13 Dorsal part 11e, 13e Ends 14a, 14b Joint part 30 Fusion part

Claims (9)

The vertical direction, the horizontal direction, and the thickness direction that are orthogonal to each other are provided. An abdominal side portion including an abdominal sheet member, a back side portion including a back side sheet member, one end to the abdominal side portion, and the other end portion. An absorbent main body that is respectively connected to the back side portion and includes a top sheet, an absorber, and a back sheet in this order in the thickness direction, and in the lateral direction in the ventral side portion and the back side portion. An absorbent article including a joint portion in which both end portions are joined to each other in a state of overlapping in the thickness direction along the longitudinal direction,
The joint portion includes a plurality of fusion-bonded portions arranged while being separated from each other along the vertical direction,
Each of the plurality of fused portions,
A core portion in which the abdominal sheet member and the back sheet member are fused to each other in the thickness direction,
A peripheral wall portion in which the ventral side sheet member and the back side sheet member are fused to each other in the thickness direction so as to extend in a tubular shape in the thickness direction from the peripheral edge of the core portion,
Including,
The absorptive main body is arranged so as to face each other at both ends in the lateral direction on the skin side, and includes a pair of leak preventive walls continuously extending along the longitudinal direction,
Each of the pair of leakproof walls includes an elastic member arranged along the vertical direction,
The effective length as the length in which the elastic member functions as an elastic body is longer than the length in the longitudinal direction of the absorber,
Absorbent article. The effective length is 80% or more of the longitudinal length of the absorbent body,
The absorbent article according to claim 1. Each of the pair of leakproof walls,
A fixed end fixed to the absorbent main body, which is one of the lateral edges.
A free end that is not fixed to the absorbent body and is the other edge in the lateral direction,
Have
In the lateral direction, the length from the free end of each of the pair of leakproof walls to the fixed end is 50 mm or more and 100 mm or less.
The absorbent article according to claim 1 or 2. Each of the pair of leakproof walls,
In the lateral direction, at least an outer edge of the base fixed to the absorbent body,
In the lateral direction, the inner edge is connected to the inner edge of the base portion, the outer edge is made movable, and a wall portion that 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 portion and the non-skin-side surface of the wall portion, the lateral inner edge of the base portion and the lateral inner edge of the wall portion are A connecting portion that has 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 connection end and that partially connects the base portion and the wall portion is provided. ,
The absorbent article according to claim 4. The absorber has a central region located at the center in the vertical direction, and a front region and a rear region located at the front and rear in the vertical direction of the central region,
The lateral width of the central region is narrower than the lateral width 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 a leg opening,
The ventral side portion and the back side portion are, in the longitudinal direction, a central region which is a central region, a waist side end region which is an end region on the side of the waist opening, and the leg opening. It is divided into the leg side end area which is the area of the side end,
The peel strength of each of the plurality of fusion-bonding portions of at least one of the waist-side end region and the leg-side end region in the joint portion is higher than the peeling strength of each of the plurality of fusion-bonding regions in the central region. high,
The absorbent article according to any one of claims 1 to 6. In at least one of the abdominal 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 more than the lateral stress in the central region. Is also big
The absorbent article according to claim 7. A method of using the absorbent article according to claim 7 or 8,
When the absorbent article is removed from the wearer, a start region that is either one of the waist side end region and the leg side end region is separately provided on each of the right and left joints in the lateral direction. From the other toward the end region, the belly-side sheet member and the back-side sheet member of the joint portion are continuously peeled off from each other in the longitudinal direction, and once stopped when the end region is reached. Steps,
In the end region, the joint portions on the right side and the left side in the lateral direction are pulled by pulling apart the central portions in the lateral direction of the waist side end regions in each of the ventral side portion and the back side portion. The step of peeling the ventral side sheet member and the back side sheet member from each other at the same time in the longitudinal direction continuously to the end,
With
How to use absorbent articles.

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