JPH1052458A - Pants type diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an under wear type disposable diaper in which both ends are not peeled off for wearing and during use and after using, they can easily be peeled off. SOLUTION: Both ends are connected at a connection area 6 of a specified width which is arranged along the both ends of the diaper, at least some of multiple connection blocks arranged on the connection area 6 at specified intervals are isosceles triangles whose sides are longer than the base, the bases of the isosceles triangles are arranged along the edge of the connection area 6, and the vertical angles of the isosceles triangles are arranged in the opposite directions alternately along the connection area 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pants-type disposable diaper which is formed in a pants-type in advance. More specifically, the present invention relates to a pants-type disposable diaper in which both side edges do not peel off during and during wearing, but are easily peeled off after use.

[0002]

2. Description of the Related Art A pants-type which is formed in advance in a pants-type by joining both side edges extending from the abdominal part and the back-side, and which can be detached after use by peeling off the joint. In the disposable diaper, the both side edges are formed by a sheet formed of a thermoplastic material, and the side edges extending from the abdominal side and the side edges extending from the back side at the waist side. For forming a joining portion by heat-sealing the heat-sealing is disclosed in Japanese Utility Model Laid-Open No. 4-44020 and Japanese Utility Model Laid-Open No. 7-3481.
No. 4 and Japanese Patent Application Laid-Open No. 7-227407 disclose a technique of intermittently arranging joining blocks having a specific shape on both side edges to form a joining region.

[0003]

What is important in the means for intermittently arranging the joining blocks disclosed in these publications is to maintain the joining state and to make it easy to peel off after use. This is to dispose the joining blocks so as to have an appropriate adhesive strength, and the shape and arrangement interval of the joining blocks greatly affect the adhesive strength.

[0004] That is, regarding the shape of the joining block, the sum of the width direction edge lengths in the direction along the width direction of the diaper and the sum of the length direction edge lengths in the direction perpendicular to the width direction of the diaper. Since it contributes to the above adhesive strength, the diaper in the length direction orthogonal to the width direction of the diaper at the end of the joint area at the waist opening side or at the end of the leg circumference opening side when worn. The spreading force tends to work mainly.In this case, the above-mentioned lengthwise edge length is increased by increasing the lengthwise edge length of each joint portion or reducing the arrangement interval of the joining blocks. It is necessary to make the total of the edge lengths in the length direction as large as possible to prevent peeling of the joint at the end of the joint area and breakage of the sheet forming the side edge near the joint at the time of wearing.

[0005] Further, in the case of a pants-type diaper during wear, the side edges are brought into close contact with the waist circumference side of the wearer, and the diaper is fixed to the body. In order to separate the individual joints in the direction along the width direction, or to apply a force in the direction of breaking near the joint of the sheet forming the side edge, in this case, the above-mentioned longitudinal edge length It is necessary to increase the total longitudinal edge length as much as possible by increasing the lengthwise edge length of each joining block or decreasing the arrangement interval of the joining blocks. However, during the wearing, the force does not necessarily act only in the direction along the width of the diaper due to the change in the exercise or posture of the wearer, and the force may act at various angles up and down.

Furthermore, in order to remove the used diaper, the joint regions on the both side edges are peeled off, and in order to form the diaper on a flat surface, individual joints in the joint region are peeled off. Alternatively, it is necessary to break the sheet forming the side edge portion as close as possible to the bonding area in the vicinity of the bonding portion, and in each case, it is required that the sheet be peeled or broken relatively easily. In order to prevent the adhesive strength from becoming too high, or if a force is applied to the bonding area in an attempt to peel or break, the distance between the fusion parts where the strength is relatively low with respect to the fusion parts, In other words, it is necessary to provide a so-called perforated break line by reducing the arrangement interval of the individual joining blocks, but in any case, it does not peel or break when worn or worn, and does not easily peel after use. It is required to be broken.

In the case of a joint area having joint blocks having the shape described in Japanese Utility Model Application Laid-Open No. 44920/1992, each joint block has a rectangular shape. It is possible to set the total length of the width direction edge along the width direction of the diaper and the interval of the coupling portion in the length direction of the diaper appropriately by setting the width of the edge in the width direction. In the longitudinal direction, the adhesive strength in the longitudinal direction may be difficult to obtain particularly at the edge of the joining region.
In addition, since the joining blocks having a rectangular shape are intermittently arranged, and the edges in the width direction are arranged in parallel along the width direction of the diaper, the angle and the width direction are changed due to a change in the movement or posture of the wearer. When a force is applied in a direction having a force, it may be difficult to obtain an adhesive strength that does not peel off during wearing.

In the case of a joint region having a joint block having a shape as described in Japanese Utility Model Application Laid-Open No. 7-34814, a joint having a V-shaped or C-shaped shape has a valley or a pinch. Since the direction of the part is always the same direction, the arrangement interval of the joining block is relatively large,
In some cases, it was difficult to obtain the total length of the edge in the width direction, or it was further difficult to obtain the total length of the edge in the length direction, and it was difficult to obtain the adhesive strength.

Further, in the case of a joint area having a joint block having a shape as described in JP-A-7-227407, the total of the longitudinal edge lengths is large at the edge of the joint area. However, the total length in the longitudinal direction does not increase while excluding the edges, and it is difficult to obtain strength in the length direction, and the joining blocks having a rectangular shape are intermittently arranged. Since the edges in the width direction are arranged in parallel along the width direction of the diaper, if a force acts in a direction that has an angle with the width direction due to the movement or posture of the wearer, it does not peel off during wearing In some cases, it was difficult to obtain a sufficient adhesive strength.

[0010] An object of the present invention is to provide a pants-type disposable diaper in which both side edges of the pants-type disposable diaper do not peel off during and during wearing, but are easily peelable after use. Is to do.

[0011]

SUMMARY OF THE INVENTION The present invention comprises a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber disposed between these two sheets. Both side edges extending in the lateral direction are provided, and both side edges are joined in a joining region having a predetermined width provided along an end of the both side edges, so that the waist opening and the legs are around. A pants-type disposable diaper in which an opening is formed and an elastic member is arranged along the opening, wherein the joining region has a plurality of joints arranged at predetermined intervals along a longitudinal direction of the joining region. The shape of at least a part of each joining block has a horizontally long isosceles triangle shape, and the base of the isosceles triangle is arranged along the edge of the joining region, and the apex angle of the isosceles triangle Are arranged alternately. Related to the pants-type disposable diaper, characterized in that. The present invention also relates to a pants-type disposable diaper, wherein the shape of each of the joining blocks is a horizontally long isosceles triangle. The present invention also relates to a pants-type disposable diaper, wherein at least one or more horizontally long isosceles triangular joint blocks are arranged at both longitudinal ends of the joint region. Furthermore, the present invention relates to a pants-type disposable diaper, wherein at least a part of the joining block is spot-shaped.

[0012]

According to the pants-type disposable diaper of the present invention, at least a portion of each of the joining blocks has a laterally long isosceles triangle, and the base has an edge at the joining region. Along, the orientation of the apex angle is alternately arranged along the joining region, and the distance between the base and the apex angle is smaller than the width of the joining region. For this reason, the length of the edge along the width direction of the diaper in the width direction of each of the horizontally long isosceles-shaped individual joining blocks in the joining region is set to an appropriate length with the side sandwiching the apex angle of the triangle, or the vertical length of the joining region. The total length of the edge along the width direction of the diaper per unit length along the direction is such that the joint does not peel off during and during wearing of the pants-type diaper by shortening the arrangement interval of the joining block Can be obtained.

Similarly, the length of the edge along the length direction of the diaper of each of the horizontally long isosceles triangular joint blocks in the joint region is set such that the base of the triangle has an appropriate length, or The total length of the edge along the length direction of the diaper per unit length along the longitudinal direction is shortened by shortening the arrangement interval of the joint block, so that the waist around the waist of the joint area when the pants-type diaper is worn The joint at the end of the diaper, or at the end near the opening around the leg, is so strong that it does not peel off, and the joints at the joints on both sides of the diaper are removed to remove the diaper after use. It is possible to easily peel along the length direction, or to easily break along the length direction of the joining region between the joining portions near the joining portion.

[0014] Further, the base of the horizontally long isosceles triangle disposed at least in part is along the side edge of the joining region,
Also, since the apical angles are arranged alternately in the length direction of the joining area, the intervals between the individual joining blocks are more than necessary compared to the case where the apical angles are all arranged in the same direction. It is possible to increase the sum of the lengths of the edges along the width direction of the diaper without reducing the width of the diaper, and to increase the bonding strength of the bonding region. On the other hand, if the apex angles are all in the same direction, shortening the interval between the individual joining blocks will make the interval between the joining portions too short, and the sheet will break near or at the joining area during or during wearing. Is not preferred.

If the distance between the base and the apex angle is smaller than the width of the joint area, the base and the apex angle of adjacent horizontally long isosceles triangles are arranged in a staggered manner, so that the distance between the joint blocks is relatively small. Even if it is shortened, the force acting along the length direction of the joining region is dispersed, and it is more preferable that the sheet does not break near the joining region during or during wearing. Furthermore, the edges along the width direction of the diaper of the horizontally long isosceles triangular joint block are two sides arranged with the vertex angle of the isosceles triangle therebetween, but this edge is in the length direction of the diaper. Are arranged along the width direction of the joint block even if force is applied to the joint area in various directions due to changes in the movement or posture of the wearer. The forces acting on the edges are dispersed so that the joint does not peel off while wearing the diaper.

The joints in the joint region are formed by heat fusion, and a fiber sheet made of a thermoplastic material or the like is fused at the joint, but the fibers forming the sheet are joined at the joint. Are mutually fused and solidified to form a film. Although the texture of the solidified joint is hard, it is necessary to soften the texture of the joint area as much as possible in order not to cause discomfort to the wearer. It is effective to widen the interval between adjacent joining blocks, and a relatively soft texture can be obtained by making the shape of the joining blocks spot-like. However, if the shape of the joining block is spotted, the edge length along the width direction of each joining block in the joining region or the width direction of the diaper per unit length along the longitudinal direction of the joining region. The sum of the lengths of the edges along the line becomes relatively small, and it is difficult to obtain a bonding strength to the extent that the bonding portion does not peel off during and during wearing of the pants-type diaper. Therefore, the opening around the waist where the force for peeling off the joint area during or during wearing or the force for breaking the sheet in the vicinity of the joint area is more likely to work, and the horizontally long isosceles in the joint area only near the openings around both legs It is also possible to dispose a triangular joint block, and to arrange a spot-like joint block having a soft texture in the joint area in a portion where a force for separating or breaking does not act much.

At this time, the length of the joining area (A) where the isosceles triangular joining blocks near the opening around the waist along the joining area is a, and the joining area where the spot-like joining blocks are arranged When the length of (B) is b, and the length of a joining region (C) where an isosceles triangular joining block near the opening around the leg is arranged is c, the joining is performed such that a, c ≦ b. When the block is arranged, the joint areas (A) and (C) in the vicinity of the opening around the waist and the opening around the leg do not peel at the time of or during wearing, and easily peel after the wearing. The texture is good in the bonding area (C), and the bonding area (A) or (C) after the wearing can be peeled very easily following the peeling. As described above, according to the present invention, the bonding area provided on both side edges and the vicinity of the bonding area do not peel or break during and during wearing, and can be easily peeled or broken after use. It is possible to obtain a joined pants-type disposable diaper.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a perspective view showing a state of wearing a pants-type disposable diaper according to an embodiment of the present invention when viewed from the front body side. The pants-type disposable diaper 1 of the present invention shown in FIG. 1 has a leg opening 2 and a waist opening 3, and a front body 4 extending between the left and right leg openings. The back body 5 is adhesively closed at the joint area 6.

In the bonding and closing of the joining area 6, the front body 4 and the back body 5 are overlapped, and both sides are projected outward, and are joined along the outermost sides of both sides by pressure melting and ultrasonic melting. FIG. 2 is a perspective view showing a stretched state in which the joining area 6 of the pants-type disposable diaper 1 of the present invention shown in FIG. 1 is opened and expanded, and a liquid-permeable top sheet 7 and a liquid-impermeable back sheet 8. The two side portions joined by the joining region 6 when mounted in the state of FIG. 1 are shown as side flaps 10 by being opened and deployed, respectively. In the vicinity of the left and right leg opening 2, leg elastic members 11 and 12 provided on both sides in the longitudinal direction of the absorber 9 are provided, and near the waist opening, the waist opening is provided. Elastic elastic member 1
3 and 14 are provided to give elasticity to each opening. 3 and 4 are enlarged views of both side edges showing details of the joining area 6 of the pants-type disposable diaper 1 of the present invention shown in FIG.

In the joining area 6, the joining blocks 15 are arranged at predetermined intervals along the outermost sides 16 on both side edges shown in FIG. 2 of the pants-type disposable diaper 1 shown in FIG. Has a horizontally long isosceles triangular shape, and each corner of the triangle may be chamfered as shown in FIG. The shapes of the respective joining blocks 15 may be all the same, and isosceles triangles having different shapes may be arranged regularly or irregularly. At this time,
The width of the joining region 6 is preferably 5 to 10 mm, and when the width is smaller than 5 mm, the individual joining blocks 1
Since the total of the width-direction edge lengths of the diapers 5 is relatively small, it is difficult to obtain such strength that the individual joining blocks 15 do not peel off when the diaper is worn or during wearing,
When the width exceeds 10 mm, since the total of the width direction edge lengths of the individual diapers of the individual joining blocks 15 becomes relatively large, excessive strength is required to peel off the joining blocks 15 when removing the diaper. Not preferred.

The length of the base of the horizontally long isosceles triangle is preferably 1 to 3 mm. If the length is smaller than 1 mm, the shape of each joint block 15 resembles a rectangular shape. If the length exceeds 3 mm, the area of each isosceles triangle becomes relatively large,
Since the total of the width-direction edge lengths of the individual joining blocks 15 in the width direction of the diaper is relatively small, it is difficult to obtain such strength that the individual joining blocks 15 do not peel off when the diaper is worn or during wearing. . Also, the distance between the vertices of the apex angles in the same direction is preferably 0.5 to 3 mm longer than the length of the base of the triangle, and the difference between the distance and the length of the base of the triangle is 0.5 mm or more. When the distance is small, the interval between the individual joining blocks 15 is too small, and the interval between the joining blocks 15 is too short, so that the joining strength is relatively low in the joining area. If the difference exceeds 3 mm, the interval between the joining blocks 15 becomes too long, so that the joining strength in the joining region becomes relatively low, which is not preferable.

The distance between the apex angle and the base of the horizontally long isosceles triangle is preferably shorter by 1 to 3 mm than the width of the joining region. If the difference is smaller than 1 mm, it is not preferable because one of the bottom sides of the adjacent joining blocks 13 and the apex angle of the other are too close to each other. If the difference is larger than 3 mm, the sum of the width direction edge lengths of the individual joining blocks 15 is relatively small. This is not preferable because it is difficult to obtain such a strength that the individual joining blocks 15 do not peel off when the diaper is worn or while the diaper is worn.

The ratio of the total area of the bonding blocks 15 arranged in the bonding region 6 per unit length to the area of the bonding region 6 is 15 to 60%, preferably 20 to 50%. More preferably, it is 30 to 45%, and if the ratio is less than 15%, it is difficult to obtain strength enough to prevent the individual joining blocks 15 from peeling off during or during wearing, and if the ratio exceeds 60%, the individual joining blocks 15 become individual. It is not preferable because an excessive strength is required to peel off No. 15.

FIG. 5 is a perspective view showing a state of wearing a pants-type diaper in another embodiment of the present invention when viewed from the side of the front body. The joining region 6 is a joining region (A) 17,
It is divided into a joining region (B) 18 and a joining region (C) 19, and the length along the joining region of (A) to (C) is a = c <
b.

FIG. 6 shows an example of the joining blocks arranged in the joining area (B) 18. Each joining block has a circular shape, but may be a square or an equilateral triangle. At this time, the size of each joint block is 2 at the maximum width.
mm or less, and if the width exceeds 2 mm, the cured bonding block deteriorates the feeling of the bonding region (B) 18, which is not preferable. Further, the distance between the individual joining blocks is preferably 0.5 to 1.5 mm. If the width is smaller than 0.5 mm, the interval between the individual joining blocks becomes too small, and the texture of the joining blocks is deteriorated. Unfavorable due to tendency, distance is 1.5
If it exceeds mm, the interval between the joining blocks becomes too long, so that it becomes difficult to obtain the joining strength of the joining region, which is not preferable.

Further, the bonding region (B) 1 per unit length
The ratio of the total area of the bonding blocks arranged in 8 to the area of the bonding region (B) 18 is 10 to 50%, preferably 15 to 40%, more preferably 25.
If the ratio is less than 10%, it is difficult to obtain strength enough to prevent the individual joining blocks 15 from peeling off during or during wearing, and if the ratio exceeds 50%, the texture of the joining region (B) 18 Is not preferred because it becomes hard.

At this time, in another embodiment of the present invention shown in FIG. 5, the joining region (A) 17 and the joining region (C) 19
The shape of the joint block arranged in the embodiment may be any shape as shown in FIGS. 1 to 4 of the embodiment of the present invention.

As the liquid-permeable surface sheet used in the pants-type disposable diaper of the present invention, a liquid-permeable nonwoven fabric made of fibers such as polyethylene, polypropylene, polyester, or other synthetic resin as a raw material is used. Can be Further, as the back sheet, a liquid-impermeable polyethylene sheet, preferably a polyethylene sheet having micropores, and a moisture-permeable liquid-impermeable sheet such as a sheet obtained by adding a filler to a thermoplastic resin and using a stretchable sheet are used. When moisture permeability is imparted, there is no fear of stuffiness, and it is more comfortable.

The elastic elastic members arranged in the waist opening and the leg opening are the same as those used in ordinary disposable diapers such as urethane thread, thread rubber, urethane film and urethane foam. These stretchable elastic members can be used in a stretched state, respectively, and are arranged in the leg opening, the waist opening, and the predetermined region of the back body, and are adhered and fixed by a hot melt adhesive. It is preferable that the absorbent be mainly composed of fluff pulp and be used in combination with a high-absorbency polymer. In addition, a single absorbent paper or a mixture or a laminate of heat-fused fibers is used. Further, it is preferable to adopt a laminated structure in which the whole is wrapped in a tissue. The shape of the absorber may be an hourglass type or a rectangular type, but a better fit is obtained with the hourglass type.

[0030]

According to the pants-type disposable diaper according to the present invention, the joining area provided along the edges of both side edges has an isosceles triangular shape having a horizontally long shape, and the base is located at the edge of the joining area. Along, the directions of the apical angles are alternately arranged along the joining area, and the distance between the base and the apex angle is smaller than the width of the joining area. The width direction edge length is such that the sides sandwiching the apex of the triangle are of an appropriate length, or by shortening the arrangement interval of the joining block, so that the joint does not peel off when wearing and during wearing pants-type diapers It is possible to obtain a joint strength. Similarly, the total of the lengthwise edge lengths of the diapers of the individual joint blocks in the joint area is determined by making the base of the triangle an appropriate length or by shortening the arrangement interval of the joint blocks, At the time of wearing, while obtaining the strength such that the joint at the waist opening side end of the joint area, or the joint at the leg periphery opening side end does not peel off,
In order to remove the diaper after use, the joints at the joint areas on both sides of the diaper can be easily peeled off in order along the length direction of the joint area, and the gap between the fusion joints near the joints is moderate It is possible to easily break the joints in order along the length direction of the joint region.

Further, since the bases of the triangles are along the side edges of the joining region and the apical angles are alternately arranged in the length direction of the joining region, the apical angles are all in the same direction. Compared to the case where the diaper is placed in a different position, the total length of the diaper in the width direction can be increased without reducing the distance between the individual joining blocks more than necessary, and the joining strength of the joining area can be increased Becomes In addition, since the distance between the base and the apex angle is smaller than the width of the bonding area, the base and the apex angle of the triangles of adjacent bonding blocks are arranged in a staggered manner, so that the distance between the bonding blocks is relatively small. Even if it is shortened, the force acting along the length of the joint area is dispersed,
The sheet does not break near the joint area during or during wearing. Furthermore, the width direction edges of the diaper of the joint block facing in the direction along the width direction of the diaper are two sides arranged with the apex angle of an isosceles triangle therebetween. It is arranged in every other direction along the length direction, so even if force is applied to the joint area in various directions due to changes in the movement or posture of the wearer, the width direction edge The forces acting on the edges are dispersed and the joints do not separate.

Further, according to the pants-type disposable diaper of the present invention, the opening around the waist where the force for peeling off the joint area during or during wearing or the force for breaking the sheet in the vicinity of the joint area works easily, A horizontally long isosceles triangular joint block is placed in the joint area only near the opening around both legs, and the part where the force to peel or break does not work much has a soft spot-like texture of the joint area. It is also possible to arrange joining blocks.

[0033]

[Brief description of the drawings]

FIG. 1 is a perspective view of a pants-type disposable diaper according to the present invention as viewed from the front body side.

FIG. 2 is a perspective view showing a state in which a joint area of the pants-type disposable diaper of FIG. 1 is opened and deployed.

FIG. 3 is an enlarged view of both side edges showing an example of details of a joining region of the pants-type disposable diaper of FIG. 1;

FIG. 4 is an enlarged view of both side edges showing another example of the details of the joining region of the pants-type disposable diaper of FIG. 1;

FIG. 5 is a perspective view of another embodiment of the pants-type disposable diaper according to the present invention as viewed from the side of the front body.

FIG. 6 is an enlarged view of both side edges showing an example of details of a joining region (B) of the pants-type disposable diaper of FIG. 5;

[Explanation of symbols]

 1: pants-type disposable diaper 2: leg opening 3: waist opening 4: front body 5: back body 6: joining area 7: top sheet 8: back sheet 9: absorber 10: side flap 11; 12: leg elastic members 13, 14: waist elastic members 15: joint block 16: outermost part 17: joint region (A) 18: joint region (B) 19: joint region (C)

Claims (4)

[Claims] 1. A liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber disposed between these two sheets, and both sides extending laterally from the abdominal part and the dorsal part. An edge portion is provided, and the both edge portions are joined in a joining region having a predetermined width provided along an end portion of the both edge portions to form an opening around the waist and an opening around both legs; A pants-type disposable diaper in which a stretchable elastic member is arranged along a portion, wherein the joining region is constituted by a large number of joining blocks arranged at predetermined intervals along a longitudinal direction of the joining region, The shape of at least a part of the joining block has a horizontally long isosceles triangle shape, and the base of the isosceles triangle is arranged along the edge of the joining region, and the directions of the apex angles of the isosceles triangle are alternately arranged. Bread that is characterized by Type Tsukai stearyl diapers. 2. The pants-type disposable diaper according to claim 1, wherein the joining blocks are all in the shape of a horizontally long isosceles triangle. 3. The pants-type disposable diaper according to claim 1, wherein at least one or more horizontally long isosceles triangular joint blocks are arranged at both longitudinal ends of the joint region. 4. The pants-type disposable diaper according to claim 1, wherein at least a part of the joining block is spot-shaped.