JP2020081461A - Underpants type disposable diaper - Google Patents

Abstract

To suppress the size of a projection projecting to one side in a thickness direction, and irregularity of cushioning property in a belt part of an underpants type disposable diaper.SOLUTION: In an underpants type disposable diaper (1), belt parts (21, 22) have laminate parts (30) in which first non-elastic sheets (213, 223), elastic nonwoven fabrics (215, 225), an elastic film (31) and second non-elastic sheets (214, 224) are laminated from one side in a thickness direction. The elastic nonwoven fabrics (215, 225), and the elastic film (31) extend in left and right directions, and the elastic nonwoven fabrics (215, 225) include elastic fibers and non-elastic fibers. The laminate part (30) has at intervals in the left and right directions, a plurality of connection parts (40) connected to the first non-elastic sheets (213, 223) in a state that the elastic nonwoven fabrics (215, 225) extend in the left and right directions.SELECTED DRAWING: Figure 3

Description

The present invention relates to a pants-type disposable diaper.

In Patent Document 1, a stretchable nonwoven fabric is arranged between a skin side sheet and a non-skin side sheet in a front body portion and a back body portion (belt portion), and these sheets are joined by a plurality of joint portions scattered. Disposable disposable diapers are disclosed. In such a disposable diaper, when the stretchable nonwoven fabric contracts in the lateral direction, the skin-side sheet protrudes toward the skin side between the welding portions adjacent in the lateral direction, and the non-skin side sheet faces toward the non-skin side. A fold (projection) is formed by protruding. On the other hand, the fibers forming the stretchable nonwoven fabric spread in the thickness direction to form a cushion that supports the folds. Therefore, it is possible to prevent the folds from being easily recessed.

JP, 2018-000478, A

However, in the diaper of Patent Document 1, the fibers constituting the stretchable nonwoven fabric are unevenly spread to one side of the skin side or the non-skin side, or spread to the skin side and the non-skin side to the same extent, and the convex portion causes There was variation in how it spread. In this way, if the sizes and cushioning properties of the convex portions are varied, the contact of the wearer with the skin becomes uneven, and the comfort of the diaper is reduced.

The present invention has been made in view of the above problems, and suppresses the variation in the size and the cushioning property of the convex portion protruding to one side in the thickness direction of the belt portion of the pants-type disposable diaper. With the goal.

The main invention for achieving the above object is a pants-type disposable diaper having a vertical direction, a horizontal direction, and a front-back direction that intersect with each other, and a belt portion, and an absorbent main body, wherein the belt portion is A first non-stretchable sheet, a stretchable nonwoven fabric, a stretchable film, and a second non-stretchable sheet are laminated from one side in the thickness direction thereof, and the stretchable nonwoven fabric, And, the stretchable film stretches in the left-right direction, the stretchable nonwoven fabric includes a stretchable fiber and a non-stretchable fiber, the laminated portion, the stretchable nonwoven fabric stretches in the left-right direction. The pants-type disposable diaper is characterized in that it has a plurality of joint portions joined to the first non-stretchable sheet in the state of being provided at intervals in the left-right direction.
Other features of the present invention will become apparent from the description of this specification and the accompanying drawings.

According to the present invention, it is possible to suppress variations in the size and cushioning property of the convex portion protruding to one side in the thickness direction of the belt portion of the pants-type disposable diaper.

1 is a schematic perspective view of a pants-type disposable diaper 1. FIG. It is a schematic plan view of the diaper 1 of a development and extension state. FIG. 3 is a schematic sectional view taken along the line I-I of FIG. 2. FIG. 4A is a schematic cross-sectional view of the laminated portion 30, and FIG. 4B is a schematic cross-sectional view of the non-arranged portion 50. It is explanatory drawing of the junction parts 40 and 41. 6A to 6C are schematic cross-sectional views of the laminated portion 30 of the modified example. 7A to 7C are conceptual diagrams showing a state in which the diaper 1 is worn.

At least the following matters will be made clear by the present specification and the description of the accompanying drawings.
That is, a pants-type disposable diaper having a vertical direction, a horizontal direction, and a front-back direction that intersect with each other, and including a belt portion and an absorbent main body, wherein the belt portion is provided from one side in the thickness direction thereof. A first non-stretchable sheet, a stretchable nonwoven fabric, a stretchable film, and a second non-stretchable sheet are laminated, and the stretchable nonwoven fabric and the stretchable film are Stretching in the left-right direction, the stretchable nonwoven fabric includes stretchable fibers and non-stretchable fibers, and the laminated portion is the first non-stretchable fabric in a state where the stretchable nonwoven fabric is stretched in the left-right direction. A pants-type disposable diaper having a plurality of joints joined to a flexible sheet at intervals in the left-right direction.

According to such a pants-type disposable diaper, when the stretchable nonwoven fabric shrinks and spreads in the thickness direction, the stretchable film can regulate the spread to the second non-stretchable sheet side. Therefore, the same amount of stretchable nonwoven fabric can be filled in the convex portion of the first non-stretchable sheet. Therefore, it is possible to suppress the variation in the size and cushioning property of the convex portion projecting to one side in the thickness direction, and the comfort of wearing the belt portion is improved.

In the pants-type disposable diaper, the laminated portion includes the stretchable nonwoven fabric and the second joint portion joined to each other in a state where the stretchable film is stretched in the left-right direction. It is a pants-type disposable diaper characterized by having a plurality in the direction.

According to such a pants-type disposable diaper, the stretchable nonwoven fabric is likely to spread in the thickness direction between the second joint portions that are adjacent to each other in the left-right direction, so that the size of the convex portion and the cushioning property can be improved. it can.

In the pants-type disposable diaper, the laminated portion includes a third joint portion joined to the second non-stretchable sheet in a state where the stretchable film extends in the left-right direction, It is a pants-type disposable diaper characterized by having a plurality in the direction.

According to such a pants-type disposable diaper, the second non-stretchable sheet leans between the third joints that are adjacent to each other in the left-right direction, and thus the user can be given an impression of a visually soft belt portion. ..

The pants-type disposable diaper is characterized in that the joint portion, the second joint portion, and the third joint portion are aligned at the respective positions in the left-right direction.

According to such a pants-type disposable diaper, the stretchable nonwoven fabric easily spreads in the thickness direction between the joint portions that are adjacent to each other in the left-right direction, so that the size of the convex portion and the cushioning property can be increased.

In this pants-type disposable diaper, the joint portion, the second joint portion, and the third joint portion are joined by welding, and the first non-stretchable sheet and the stretchable nonwoven fabric At least one of the stretchable film and the second non-stretchable sheet is a pants-type disposable diaper characterized by containing a polypropylene resin.

According to such a pants-type disposable diaper, the positions of the joints can be easily aligned. Further, the welding strength at the joint portion can be increased, and the convex portion projecting to one side in the thickness direction can be easily maintained.

The pants-type disposable diaper is characterized in that, in the laminated portion, a plurality of the joint portions are arranged at intervals in the vertical direction, and are arranged.

According to such a pants-type disposable diaper, the belt portion is likely to be deformed in the vertical direction, and the belt portion is easily fitted along the bulge of the lower abdomen or buttocks of the wearer, and the comfort of wearing the belt portion is improved.

The pants-type disposable diaper is characterized in that the joints adjacent to each other in the left-right direction have a constant gap, and the joints adjacent to each other in the up-down direction have a constant gap. is there.

According to such a pants-type disposable diaper, it is possible to more uniformize the size and cushioning property of the convex portion protruding to one side in the thickness direction.

The pants-type disposable diaper is characterized in that the one side in the thickness direction is the wearer's skin side.

According to such a pants-type disposable diaper, the convex portion having a uniform size and cushioning property comes into contact with the wearer's skin, so that it is easy to feel the comfort of the belt portion.

The pants-type disposable diaper is characterized in that the one side in the thickness direction is the non-skin side of the wearer.

According to such a pants-type disposable diaper, since the convex portion having a uniform size and cushioning property comes into contact with the wearer's clothes, it is possible to suppress the variation in rubbing between the clothes and the belt portion, and to make the wearer feel uncomfortable. Can be reduced.

In such a pants-type disposable diaper, the belt portion has a non-arrangement portion in which the elastic film is not arranged, and the non-arrangement portion is a state in which the elastic nonwoven fabric extends in the left-right direction. The pants-type disposable diaper is characterized in that it has a plurality of fourth joint portions joined to the first non-stretchable sheet and the second non-stretchable sheet at intervals in the left-right direction. ..

According to such a pants-type disposable diaper, in the non-arranged portion, the moist air in the belt portion can be discharged to the outside in the thickness direction, and stuffiness in the belt portion can be reduced. Further, in the non-arranged portion, since the convex portion having the cushioning property filled with the elastic nonwoven fabric is formed, the comfort of wearing the belt portion is improved.

In such a pants-type disposable diaper, the belt portion includes a front belt portion arranged on the wearer's abdominal side, a rear belt portion arranged on the wearer's back side, and the left and right sides of the front belt portion. A pair of locking portions in which both side portions in the vertical direction and both side portions in the left-right direction of the rear belt portion are locked, and at a portion of the belt portion that overlaps the locking portion in the vertical direction. The area of the laminated portion is smaller than the area of the non-arranged portion, which is a pants-type disposable diaper.

According to such a pants-type disposable diaper, in the non-arranged portion, the moist air in the belt portion can be discharged to the outside in the thickness direction, and stuffiness in the belt portion can be reduced.

In the pants-type disposable diaper, the belt portion includes a front belt portion arranged on the abdominal side of the wearer and a rear belt portion arranged on the back side of the wearer, and the laminated portion is The pants-type disposable diaper is characterized in that a plurality of circumferential laminated portions circumferentially provided over the front belt portion and the rear belt portion are provided at intervals in the vertical direction.

According to such a pants-type disposable diaper, since the laminated portion of the belt portion partially adheres to the waistline of the wearer, it is possible to suppress slipping of the diaper and suppress giving excessive pressure. .. In addition, the moist air in the belt portion can be discharged to the outside in the thickness direction between the circumferential laminated portions, and stuffiness in the belt portion can be reduced.

In this pants-type disposable diaper, the elastic nonwoven fabric and the elastic film are not arranged at the upper end of the belt portion along the waistline opening, and a plurality of thread-like elastic members are spaced in the vertical direction. It is a pants-type disposable diaper characterized by being laid open.

According to such a pants-type disposable diaper, the upper end portion of the belt portion can be locally brought into close contact with the wearer, and slippage of the diaper can be suppressed.

=== Embodiment ===
Hereinafter, as the pants-type disposable diaper, an embodiment will be described by taking a pants-type disposable diaper for adults as an example. However, the present invention is not limited to this, and the pants-type disposable diaper according to the present invention can also be applied as, for example, a disposable diaper for children (for infants) or a sanitary shorts.

<<Basic configuration of diaper 1>>
FIG. 1 is a schematic perspective view of a pants-type disposable diaper 1 (hereinafter, also referred to as diaper 1). FIG. 2 is a schematic plan view of the diaper 1 in a developed and expanded state. The stretched state of the diaper 1 is a state in which the diaper 1 is stretched without wrinkles, and the dimensions of each member (for example, the sheet that configures the exterior body 20) included in the diaper 1 match the dimensions of the single member. Or, it is in a stretched state until it becomes a length close to it. FIG. 3 is a schematic cross-sectional view taken along line I-I (center in the left-right direction) of FIG. 2.

The diaper 1 has an up-down direction, a left-right direction, and a front-back direction that intersect with each other, and also has a thickness direction in which the respective members are stacked, as shown in FIG. In the vertical direction, the side that is the body side of the wearer is the upper side, and the side that is the crotch of the wearer is the lower side. In the front-back direction, the side that is the ventral side of the wearer is the front side, and the side that is the back side of the wearer is the rear side. In the thickness direction, the side in contact with the wearer is the skin side, and the opposite side is the non-skin side.

The diaper 1 has an absorbent main body 10 and an exterior body 20 located on the non-skin side of the absorbent main body 10. The exterior body 20 includes a front belt portion 21 (belt portion) arranged on the wearer's ventral side, a rear belt portion 22 (belt portion) arranged on the wearer's back side, and a crotch portion 23 connecting them. And have.

In the diaper 1 of the present embodiment, the exterior body 20 is composed of three members (the front belt portion 21, the rear belt portion 22, and the crotch portion 23), but the present invention is not limited to this. For example, the front belt portion 21, the rear belt portion 22, and the crotch portion 23 may be formed as one continuous member. Alternatively, the crotch portion 23 may not be provided.

In the unfolded diaper 1 shown in FIG. 2, the front belt portion 21 is located on one end side in the longitudinal direction of the absorbent main body 10, and the rear belt portion 22 is located on the other end side in the longitudinal direction of the absorbent main body 10. positioned. In the unfolded diaper 1, the absorbent main body 10 is folded in two at substantially the center in the longitudinal direction, and the left and right side portions of the front belt portion 21 and the left and right side portions of the rear belt portion 22 are joined together by welding or the like. By being stopped and the pair of locking portions 24 are formed, the pants type shown in FIG. 1 is obtained. That is, the longitudinal direction of the absorbent main body 10 is along the up-down direction of the diaper 1, and the front belt portion 21 and the rear belt portion 22 are annularly connected to each other, and the waistline opening 1a is formed at the upper end thereof. A pair of leg openings 1b are formed in the.

As shown in FIG. 3, the absorbent main body 10 includes an absorbent core 11, a liquid-permeable topsheet 12 located on the skin side of the absorbent core 11, and a back located on the non-skin side of the absorbent core 11. And the seat 13. The back sheet 13 of the present embodiment has a two-layer structure of a liquid impermeable sheet 13a and a liquid permeable sheet 13b arranged on the non-skin side thereof.

The absorbent core 11 is a member that absorbs and retains excreted liquid such as urine, and is formed of liquid absorbent fiber such as pulp fiber mixed with super absorbent polymer (SAP), for example. Although not shown, the absorbent core 11 may have its outer peripheral surface covered with a liquid-permeable sheet such as tissue paper or nonwoven fabric.

As shown in FIG. 2, the front belt portion 21 and the rear belt portion 22 are located below the waist regions 211 and 221 and below the waist regions 211 and 221 which are regions that overlap the locking portion 24 in the vertical direction. Side crotch regions 212 and 222.

The crotch region 212, 222 has a substantially trapezoidal shape, and the width (width in the left-right direction) becomes narrower toward the lower side. In addition, the crotch region 222 of the rear belt portion 22 is larger than that of the front belt portion 21, so that the buttocks of the wearer can be covered.

As shown in FIG. 3, the front belt portion 21, the rear belt portion 22, and the crotch portion 23 are located between the skin side sheets 213, 223, and 231 and the non-skin side sheets 214, 224, 232, and between them. The elastic nonwoven fabrics 215, 225 and 233 are provided.

<<Regarding the laminated portion 30 of the belt portion>>
FIG. 4A is a schematic sectional view of the laminated portion 30, and FIG. 4B is a schematic sectional view of the non-arranged portion 50. FIG. 5 is an explanatory diagram of the joint portions 40 to 43. 6A to 6C are schematic cross-sectional views of the laminated portion 30 of the modified example.

As shown in FIG. 3 and FIG. 4A, the front belt portion 21 and the rear belt portion 22 (hereinafter, also referred to as “belt portion”) are connected to the skin side sheets 213 and 223 from the skin side in the thickness direction. The stretchable nonwoven fabrics 215 and 225, the stretchable film 31, and the non-skin side sheets 214 and 224 have a “laminated portion 30”. However, the laminated portion 30 is not limited to a four-layer structure, and may have a structure of five layers or more such that another sheet is laminated or a part of the four-layer sheet is folded back.

The elastic nonwoven fabrics 215 and 225 and the elastic film 31 are sheets that expand and contract at least in the left-right direction of the diaper 1. On the other hand, the skin side sheets 213 and 223 and the non-skin side sheets 214 and 224 are non-stretchable sheets that do not substantially stretch. Further, the stretchable nonwoven fabrics 215 and 225 are nonwoven fabrics containing stretchable fibers and non-stretchable fibers (that is, stretchable fibers having lower shrinkage than the stretchable fibers).

Examples of the skin side sheets 213 and 223 and the non-skin side sheets 214 and 224 include flexible sheets formed of spunbonded nonwoven fabric, SMS nonwoven fabric, or the like.

As the elastic nonwoven fabrics 215 and 225, elastic fibers of polyurethane-based elastomer which is a kind of thermoplastic elastomer having elasticity, and polypropylene (PP) which is a polyolefin resin which is a kind of thermoplastic resin having non-elasticity are used. A non-woven fabric in which the stretchable fiber is subjected to an appropriate stretching treatment such as gear stretching can be exemplified. The stretching treatment may be performed in mutually orthogonal directions (horizontal direction and vertical direction of the diaper 1) or may be performed only in a predetermined direction (horizontal direction of the diaper 1). Good. When the stretching treatment is performed only in the predetermined direction, stretchability in the predetermined direction is expressed, but since the orientation of all fibers is not always along the predetermined direction, the stretchability is also in the direction orthogonal to the predetermined direction. Elasticity is expressed.

As the stretchable film 31, a stretchable elastic member can be exemplified, which is obtained by melting an elastomer resin such as urethane or styrene to form a sheet having a uniform thickness. Further, for example, a stretchable film in which a polyolefin layer is integrated on the front surface and the back surface of the elastomer layer may be used. When this stretchable film is used, since the polyolefin layer does not have stretchability, stretchability can be exhibited by stretching the film in advance. The presence of the polyolefin layer on the surface has the advantage of facilitating welding with the polyolefin fiber nonwoven fabric.

Then, as shown in FIGS. 4A and 5, the laminated portion 30 has four layers constituting the laminated portion 30 in a state where the stretchable nonwoven fabrics 215 and 225 and the stretchable film 31 extend in the left-right direction of the diaper 1. A plurality of "joined portions 40" to which the sheets are joined are provided at intervals in the left-right direction.

Therefore, in a state where the diaper 1 is contracted in the left-right direction, for example, in a state where the belt portions 20 and 30 are fitted around the waist of the wearer after the waist openings of the belt portions 20 and 30 are widened and worn, the laminated portion 30 Becomes as shown in FIG. 4A. That is, the non-stretchable skin-side sheets 213 and 223 and the non-skin-side sheets 214 and 224 are curled up between the adjoining joint portions 40 in the left-right direction to form convex portions protruding outward in the thickness direction. .. On the other hand, in the stretchable nonwoven fabrics 215 and 225, the stretchable fiber contracts while entangling (collecting) the non-stretchable fiber, and thus expands (swells) in the thickness direction.

At this time, if the stretchable film 31 is not arranged between the skin-side sheets 213 and 223 and the non-skin-side sheets 214 and 224, it becomes as shown in FIG. 4B. That is, the fibers forming the stretchable nonwoven fabrics 215, 225 are concentrated on the skin side or the non-skin side, or are concentrated on both the skin side and the non-skin side to the same degree. Then, the protrusions cause variations in the one-sided spread in the thickness direction, resulting in uneven contact with the wearer's skin.

On the other hand, in the laminated portion 30, the stretchable film 31 is arranged between the skin side sheets 213 and 223 and the non-skin side sheets 214 and 224. The elastic film 31 shrinks flat. Therefore, the stretchable film 31 restricts the expansion of the stretchable nonwoven fabrics 215 and 22 to the other side in the thickness direction (here, the non-skin side), and stretches to one side in the thickness direction (here, the skin side). Of the elastic nonwoven fabrics 215 and 225 are contracted and gathered. That is, the spaces in the convex portions of the skin-side sheets 213 and 223 are filled with the same amount of fibers that form the stretchable nonwoven fabrics 215 and 225. As a result, as shown in FIG. 4A, the size (bulk) of the protrusion protruding to the skin side in the thickness direction can be made uniform. Further, since the convex portion protruding to the skin side is supported by the same amount of fibers, it is hard to be crushed and the cushioning property (shape recovery property) of the convex portion is made uniform. Therefore, the contact of the laminated portion 30 with the wearer can be improved.

In particular, when the stretchable nonwoven fabrics 215 and 225 are arranged closer to the wearer's skin side (one side in the thickness direction) than the stretchable film 31, the skin side sheets 213 and 223 (first non-stretchable sheet) are used. The protrusion having a uniform size and cushioning property directly contacts the wearer's skin. Therefore, it is easy for the wearer to feel the good skin contact of the laminated portion 30. Further, since the concave portion between the convex portions protruding to the skin side serves as an air passage, the vertical air permeability of the belt portions 21 and 22 is improved, and stuffiness inside the belt portions 21 and 22 can be reduced.

However, not limited to the above, the elastic nonwoven fabrics 215 and 225 may be arranged on the non-skin side (one side in the thickness direction) of the wearer than the elastic film 31 (not shown). In this case, the non-skin side sheets 214, 224 (first non-stretchable sheet) form a convex portion on the non-skin side, but the size and the cushioning property of the convex portion are made uniform, so that the laminated portion is formed. It is possible to improve the skin contact with the wearer of 30. Specifically, since the friction (ground contact area) between the protrusion protruding to the non-skin side and the wearer's clothes is made uniform, it is possible to reduce the discomfort during wearing. Further, in this case, the convex portion having a uniform height is easily visible to the user. Therefore, it is possible to visually give the user the impression of being a soft diaper 1.

The elastic film 31 preferably has higher rigidity in the thickness direction than the elastic nonwoven fabrics 215 and 225. By doing so, the stretchable film 31 is less likely to be deformed in the thickness direction, and the expansion of the stretchable nonwoven fabrics 215 and 225 to the other side (non-skin side) in the thickness direction can be further regulated. Therefore, the space in the convex portions of the skin-side sheets 213, 223 can be filled with the same amount of fibers forming the stretchable nonwoven fabrics 215, 225, and the size of the convex portions and the cushioning property can be made more uniform. ..

Comparison of the rigidity of the elastic film 31 and the elastic nonwoven fabrics 215 and 225 can be confirmed by a known method. For example, the elastic film 31 and the elastic nonwoven fabrics 215 and 225 are cut out from the diaper to be measured and used as samples. Then, for each sample, the thickness of the sample in a natural state (non-loaded state) and the thickness of the sample under a constant load are measured, and the difference between them is calculated. It can be seen that the sample having a smaller difference in thickness has a smaller amount of deformation and higher rigidity.

Further, in the laminated portion 30, at least the stretchable nonwoven fabrics 215 and 225 and the non-stretchable sheets (here, the skin side sheets 213 and 223) adjacent to the stretchable nonwoven fabrics 215 and 225 of the four-layer sheet are included in the diaper 1. It suffices if they are joined at intervals in the left-right direction.

For example, as shown in FIG. 6A, the joint portions 42 for joining the stretchable nonwoven fabrics 215, 225 and the stretchable film 31 are continuous in the left-right direction, and the stretchable film 31 and the non-skin side sheets 214, 224 are joined together. The joint portion 43 may also be continuous in the left-right direction. In this case as well, the fibers forming the stretchable nonwoven fabrics 215 and 225 spread to the skin side of the stretchable film 31, so that the size of the protrusion protruding to the skin side and the cushioning property can be made uniform.

However, as shown in FIG. 6B, in the laminated portion 30, the stretchable nonwoven fabrics 215 and 225 and the stretchable film 31 are joined to each other in the state of being stretched in the left-right direction (second joining portion). It is preferable that a plurality of are arranged at intervals in the left-right direction. By doing so, the fibers forming the stretchable nonwoven fabrics 215 and 225 are easily spread in the thickness direction between the joint portions 42 that are adjacent to each other in the left-right direction. Therefore, the size and cushioning property of the convex portion protruding to the skin side can be increased. Further, since the area of the joint portion 42 having high rigidity is reduced, the laminated portion 30 can be softened, and the wearer's skin contact can be improved.

In addition, as shown in FIG. 4A, in the laminated portion 30, the non-stretchable sheet (non-skin side sheets 214, 224 (second It is preferable that a plurality of joint portions 43 (third joint portions) for joining the two non-stretchable sheets) are arranged at intervals in the left-right direction. By doing so, the non-skin side sheets 214, 224 lean between the adjacent joint portions 43 in the left-right direction, so that the user can be visually given the impression of being a soft diaper 1. Alternatively, it can be said that the stretchable film 31 can be prevented from interlocking with the non-skin side sheets 214 and 224, and the stretchable film 31 can be easily contracted in a flat shape. Therefore, the stretchable nonwoven fabrics 215 and 225 are more likely to spread to the skin side than the stretchable film 31, and the size of the protrusion protruding to the skin side and the cushioning property can be made uniform. Further, since the area of the joint portion 43 having high rigidity is reduced, the laminated portion 30 can be softened, and the wearer's skin contact can be improved.

That is, it is preferable that the four layers of sheets forming the laminated portion 30 are intermittently joined to the sheets adjacent to each other in the thickness direction in the left-right direction.

In that case, for example, as shown in FIG. 6C, a joint portion 40 that joins the skin-side sheets 213 and 223 and the elastic nonwoven fabrics 215 and 225, and a joint portion 42 that joins the elastic nonwoven fabrics 215 and 225 and the elastic film 31. The position of the (second joint portion) in the left-right direction may be displaced. Also in this case, since the stretchable nonwoven fabrics 215 and 225 spread to the skin side of the stretchable film 31, the size of the protrusion protruding to the skin side and the cushioning property can be made uniform.

However, as shown in FIG. 4A, a joint portion 40 that joins the skin-side sheets 213 and 223 and the stretchable nonwoven fabrics 215 and 225, and a joint portion 42 that joins the stretchable nonwoven fabrics 215 and 225 and the stretchable film 31 (second It is preferable that the left and right positions of the joint portion) and the joint portion 43 (third joint portion) for joining the stretchable film 31 and the non-skin side sheets 214, 224 are aligned.

By doing so, the stretchable nonwoven fabrics 215, 225 are likely to spread in the thickness direction, so that the size and the cushioning property of the protrusion protruding to the skin side can be increased. Further, since the joined portions 40, 42, 43 formed by welding are formed into a film, the air permeability in the thickness direction is lower than that of the unjoined portion. Therefore, since the positions of the joints 40, 42, 43 are aligned, the flow of air in the thickness direction at the non-joint portions becomes smooth. Therefore, the moist air in the belt portions 21 and 22 can be efficiently discharged to the non-skin side in the thickness direction. More preferably, the positions of the joint portions 40, 42, 43 in the vertical direction are also aligned, and in that case, the moist air can be discharged to the non-skin side more efficiently.

Examples of the joining method for the joining portions 40, 42, 43 of the laminated portion 30 include joining by an adhesive and joining by welding such as heat welding or ultrasonic welding. When aligning the positions of the bonding portions 40, 42, 43 of each layer, it is preferable to bond them by welding. By doing so, the four-layered sheets forming the laminated portion 30 can be joined simultaneously and with the same welding pattern. Therefore, the positions of the joints 40, 42, 43 of the respective layers can be easily and surely aligned.

Moreover, when joining the joining portions 40, 42, and 43 by welding, it is preferable that at least one of the four-layer sheets forming the laminating portion 30 contains a polypropylene (PP) resin. By doing so, the welding strength at the joints 40, 42, 43 can be increased, and peeling of the joints 40, 42, 43 can be suppressed. Therefore, it becomes easy to maintain the convex portion projecting to one side (skin side) in the thickness direction.

Further, the joint portions 40, 42, 43 have higher rigidity than the unjoined portions. Therefore, when the joining portion 40 extends long in the left-right direction of the diaper 1, the laminated portion 30 becomes difficult to deform in the left-right direction. Therefore, it is preferable that the four layers of sheets forming the laminated portion 30 are intermittently joined in the left-right direction. By doing so, the laminated portion 30 is easily deformed in the left-right direction, and the belt portions 21 and 22 are easily fitted along the waistline of the wearer.

Similarly, it is preferable that a plurality of the joint portions 40, 42, 43 be arranged at intervals in the vertical direction of the diaper 1. By doing so, the laminated portion 30 is easily deformed in the vertical direction, and the belt portions 21 and 22 are easily fitted along the bulge of the lower abdomen or buttocks of the wearer. In addition, since the joint portions 40, 42, 43 having high rigidity are intermittently arranged in the vertical direction, the laminated portion 30 can be softened, and the wearer's skin contact can be improved.

Further, as shown in FIG. 5, the gap W1 between the joints 40, 42, 43 adjacent to each other in the left-right direction of the diaper 1 is constant, and the gap W2 between the joints 40, 42, 43 adjacent in the up-down direction of the diaper 1 is constant. Is preferably constant. By doing so, it is possible to fill the space in the convex portion projecting to one side (skin side) in the thickness direction with the same amount of fibers constituting the stretchable nonwoven fabrics 215 and 225, and to increase the size of the convex portion and the cushion. The property can be made more uniform. In addition, at least a part of the plurality of joint portions 40, 42, 43 included in the laminated portion 30 may have a constant spacing, and preferably, the spacing of all the joint portions 40, 42, 43 may be constant.

Further, as shown in FIG. 3, the belt portions 21 and 22 may include the laminated portion 30 and the “non-arranged portion 50” in which the stretchable film 31 is not arranged. In the non-arrangement part 50, the stretchable nonwoven fabrics 215, 225 are arranged between the skin side sheets 213, 223 and the non-skin side sheets 214, 224.

The stretchable film 31 has poor air permeability in the thickness direction as compared with the stretchable nonwoven fabrics 215 and 225. Therefore, by partially disposing the stretchable film 31 (the laminated portion 30) on the belt portions 21 and 22, the moist air in the belt portions 21 and 22 is moved from the non-arrangement portion 50 to the non-skin side in the thickness direction. It can be discharged, and stuffiness in the belt portions 21 and 22 can be suppressed.

The non-arranged portion 50 is also joined to the skin-side sheets 213 and 223 and the non-skin-side sheets 214 and 224 with the stretchable nonwoven fabrics 215 and 225 extending in the left-right direction. It is preferable that a plurality of (joint portions) of (1) are provided at intervals in the lateral direction.

By doing so, as shown in FIG. 4B, even in the non-arrangement portion 50, the skin-side sheets 213 and 223 and the non-skin-side sheets 214 and 224 swell and protrude between the joint portions 41 that are adjacent in the left-right direction. Portions are formed, and the stretchable nonwoven fabrics 215 and 225 spread in the thickness direction. Therefore, the cushioning property of the convex portion formed on the non-arranged portion 50 is enhanced.

However, in the non-arranged portion 50, the size of the convex portion protruding to one side in the thickness direction varies as compared with the laminated portion 30. However, since the stretchable film 31 is not arranged in the non-arrangement portion 50, the non-arrangement portion 50 has a lower pressure (tightening pressure) when wearing the diaper than the laminated portion 30. That is, the force of extending the non-arranged portion 50 having the unit width (per unit length in the vertical direction) in the left-right direction by a unit length is smaller than the force of extending the laminated portion 30 having the unit width in the left-right direction by the unit length, The non-arranged portion 50 has a weaker degree of adhesion to the wearer than the laminated portion 30. Therefore, even if the size and the cushioning property of the convex portion vary in the non-arranged portion 50, it is difficult for the wearer to feel the variation, and it is possible to suppress deterioration in the comfort of wearing the diaper 1. Conversely speaking, since the laminated portion 30 has a strong adhesion to the wearer, the size of the convex portion and the cushioning property can be made uniform to improve the wearing comfort of the diaper 1.

Similarly to the laminated portion 30, in the non-arranged portion 50, the joint portion that joins the skin side sheets 213 and 223 and the stretchable nonwoven fabrics 215 and 225, the stretchable nonwoven fabrics 215 and 225, and the non-skin side sheets 214 and 224. It is preferable that the respective positions of the joints for joining are aligned. By doing so, the non-arranged portion 50 becomes softer and the air permeability in the thickness direction is improved as compared with the film-formed joint portion 41.

In addition, in the region of the belt portions 21 and 22 (girth regions 211 and 221) that vertically overlap with the pair of locking portions 24 that lock the front belt portion 21 and the rear belt portion 22, the area of the laminated portion 30 is It is preferable that the area is smaller than the area of the non-arranged portion 50.

By doing so, since the laminated portion 30 of the belt portions 21 and 22 partially adheres to the waistline of the wearer, it is possible to suppress the displacement of the diaper 1 and give the wearer an excessive feeling of pressure. It can be prevented. In addition, since the area of the non-arranged portion 50 is large, it is possible to further suppress stuffiness in the belt portions 21 and 22. The area comparison between the laminated portion 30 and the non-arranged portion 50 may be performed by a known method. For example, the comparison can be performed by a visual method or a method using area calculation software.

7A to 7C are conceptual diagrams showing a state in which the diaper 1 is worn. 7A is a front view, FIG. 7B is a rear view, and FIG. 7C is a side view. In the figure, the first laminated portion group 32A and the second laminated portion group 32B are indicated by alternate long and short dash lines.

It is preferable that the laminated portion 30 is continuously provided in the circumferential direction across the front belt portion 21 and the rear belt portion 22. By doing so, the front belt portion 21 and the rear belt portion 22 are in close contact with each other around the waist of the wearer, and thus the displacement of the diaper 1 can be suppressed.

Further, as shown in FIG. 2, the laminated portion 30 has a plurality of circumferential laminated portions 30a and 30b provided circumferentially on the front belt portion 21 and the rear belt portion 22 at intervals in the vertical direction. Preferably. That is, it is preferable that the circumferential laminated portions 30a and 30b and the non-arranged portions 50 are alternately arranged in the vertical direction. By doing so, the moist air in the belt portions 21 and 22 can be discharged to the non-skin side in the thickness direction by the non-arrangement portion 50 between the circumferential laminated portions 30a and 30b, and the inside of the belt portions 21 and 22 can be discharged. The stuffiness of the can be suppressed.

Specifically, the laminated portion 30 has a first laminated portion group 32A and a second laminated portion group 32B, and in each of the laminated portion groups 32A and 32B, three circumferential laminated portions 30a and 30b (that is, three laminated portions 30a and 30b). Stretchable films 31) are arranged vertically spaced apart. Further, in each of the stacking unit groups 32A and 32, the three stacking units 30a and 30b on the front side and the corresponding three stacking units 30a and 30b on the rear side have the same vertical position in the locking unit 24. It is arranged so that. The front stretchable film 31 and the rear stretchable film 31 in the locking portion 24 are not limited to be completely aligned with each other, and may be partially displaced in the vertical direction.

Further, the first stacked unit group 32A is separated from the second stacked unit group 32B in the locking part 24 and is arranged above the second stacked unit group 32B. And the 1st laminated part group 32A is arrange|positioned so that at least an upper end may become an upper side of a wearer's upper anterior iliac spine, and the 2nd laminated part group 32B may have a lower end lower than an upper anterior iliac spine. It is preferable that they are arranged on the side. In the present embodiment, the lower end of the first stacked unit group 32A is arranged so as to pass over the superior anterior iliac spine. The superior anterior iliac spine is a protruding portion of the iliac bone, which is the largest bone in the pelvis, and is a protrusion that touches a finger when a hand is placed on the lower back. This allows the upper anterior iliac spine of the wearer to be sandwiched between the first laminated portion group 32A and the second laminated portion group 32B when the diaper 1 is worn. Therefore, the displacement of the diaper 1 when worn can be suppressed.

The first stacked unit group 32A is curved so as to be convex downward on the ventral side, and is arranged substantially horizontally below the upper end of the rear belt portion 22 on the back side. On the other hand, the second stacked unit group 32B is arranged substantially horizontally on the ventral side and is curved so as to be convex upward on the back side. Therefore, as shown in FIGS. 7A to 7C, in the center C of the diaper 1 in the left-right direction, the lower end of the first stacked unit group 32A on the back side is higher than the lower end of the first stacked unit group 32A on the belly side. It is located in. Similarly, at the center C of the diaper 1 in the left-right direction, the lower end of the second stacked unit group 32B on the back side is arranged above the lower end of the second stacked unit group 32B on the belly side. As a result, the lower abdomen can be tightened diagonally upward, and the abdominal pressure can be increased. Therefore, the muscles around the pelvis (abdominal muscles, etc.) can be assisted to stabilize the pelvis.

In addition, as shown in FIGS. 2 and 3, the elastic nonwoven fabrics 215 and 225 and the elastic film 31 are not arranged at the upper end portions 216 and 226 of the belt portion along the waist opening 1a of the diaper 1, It is preferable that the thread-like elastic members 26 (for example, thread rubber or the like) are arranged at intervals in the vertical direction. In the diaper 1 of the present embodiment, the plurality of thread-like elastic members 26 are arranged between the non-skin side sheets 214 and 224 that are folded back to the skin side in the thickness direction.

By doing so, the stretchable film 31 is not arranged at the upper end portions 216 and 226 of the belt portion, and the number of laminated sheets is smaller than that of the laminated portion 30 and the non-arranged portion 50. Has good breathability. Therefore, the moist air in the belt portions 21 and 22 can be discharged from the upper end portions 216 and 226 of the belt portions, and the stuffiness inside the belt portions 21 and 22 can be suppressed. Further, since the upper ends 216 and 226 of the belt part are locally fitted by the thread-like elastic member 26, the diaper 1 can be prevented from slipping off. Conversely speaking, the laminated portion 30 and the non-arranged portion 50 can be fit to the wearer in terms of the surface by the sheet-like stretchable nonwoven fabrics 215 and 225 and the stretchable film 31. Therefore, the fitted state of the diaper 1 to the wearer is maintained without hindering the movement of the wearer.

However, the present invention is not limited to the above, and for example, the belt portions 21 and 22 do not have the non-arranged portion 50, and are laminated on the entire area of the belt portions 21 and 22 or the entire area below the upper end portions 216 and 226 of the belt portions. The part 30 (stretchable film 31) may be arranged. Further, the laminated portion 30 may be arranged only on one of the front belt portion 21 and the rear belt portion 22.

Although the embodiments of the present invention have been described above, the above embodiments are for the purpose of facilitating the understanding of the present invention and are not for limiting and interpreting the present invention. Further, it is needless to say that the present invention can be modified or improved without departing from the spirit of the present invention and that the present invention includes equivalents thereof.

1 diaper (pants-type disposable diaper),
10 absorbent body, 11 absorbent core,
12 top sheets, 13 back sheets,
20 exterior body,
21 Front belt part (belt part),
22 Rear belt part (belt part),
213, 223 skin side sheet (first non-stretchable sheet, second non-stretchable sheet),
214, 224 non-skin side sheet (first non-stretchable sheet, second non-stretchable sheet)
215,225 stretchable non-woven fabric,
23 inseam, 24 locking part,
30 laminated portion, 30a, 30b circumferential laminated portion,
31 stretchable film,
32A first laminated portion group, 32B second laminated portion group,
40 joints, 41 joints,
42 joints (second joint), 43 joints (third joint),
50 Non-placed part,

Claims (13)

It has a vertical direction intersecting with each other, a horizontal direction and a front-back direction,
A pants-type disposable diaper including a belt portion and an absorbent main body,
The belt portion has a laminated portion in which a first non-stretchable sheet, a stretchable nonwoven fabric, a stretchable film, and a second non-stretchable sheet are stacked from one side in the thickness direction thereof,
The stretchable nonwoven fabric, and the stretchable film stretches in the left-right direction,
The stretchable nonwoven fabric includes stretchable fibers and non-stretchable fibers,
The laminated portion has a plurality of joint portions, which are joined to the first non-stretchable sheet in a state where the stretchable nonwoven fabric is stretched in the left-right direction, at intervals in the left-right direction. Pants type disposable diaper. The pants-type disposable diaper according to claim 1,
The laminated portion has a plurality of the elastic nonwoven fabric and a plurality of second joints, which are joined to each other in a state where the elastic film extends in the left-right direction, at intervals in the left-right direction. Pants type disposable diaper characterized by. The pants-type disposable diaper according to claim 2,
The laminated portion has a plurality of third joint portions, which are joined to the second non-stretchable sheet in a state where the stretchable film extends in the left-right direction, at intervals in the left-right direction. Pants type disposable diaper characterized by. The pants-type disposable diaper according to claim 3,
A pants-type disposable diaper characterized in that the joint portion, the second joint portion, and the third joint portion are aligned at respective positions in the left-right direction. The pants-type disposable diaper according to claim 4,
The joint portion, the second joint portion, and the third joint portion are joined by welding,
At least one of the first non-stretchable sheet, the stretchable nonwoven fabric, the stretchable film, and the second non-stretchable sheet contains a polypropylene resin, and is a pants-type disposable. Diapers. The pants-type disposable diaper according to any one of claims 1 to 5,
In the laminated portion, a plurality of the joint portions are arranged at intervals in the vertical direction, and the pants-type disposable diaper is characterized in that. The pants-type disposable diaper according to claim 6,
The interval between the joint portions adjacent in the left-right direction is constant,
A pants-type disposable diaper, characterized in that the intervals between the vertically adjacent joints are constant. The pants-type disposable diaper according to any one of claims 1 to 7,
The pants-type disposable diaper, wherein the one side in the thickness direction is the wearer's skin side. The pants-type disposable diaper according to any one of claims 1 to 7,
The pants-type disposable diaper, wherein the one side in the thickness direction is a non-skin side of the wearer. The pants-type disposable diaper according to any one of claims 1 to 9,
The belt portion has a non-arranged portion in which the elastic film is not arranged,
The non-arranged portion includes a fourth joint portion joined to the first non-stretchable sheet and the second non-stretchable sheet in a state where the stretchable nonwoven fabric extends in the left-right direction, A pants-type disposable diaper, which is characterized by having a plurality of left and right spaces. The pants-type disposable diaper according to claim 10,
The belt portion includes a front belt portion arranged on the wearer's ventral side, a rear belt portion arranged on the wearer's back side, both side portions of the front belt portion in the left-right direction, and the rear belt. A pair of locking portions that are locked to both left and right side portions of the portion,
The pants-type disposable diaper, wherein the area of the laminated portion is smaller than the area of the non-arranged portion in the portion of the belt portion that overlaps the locking portion in the vertical direction. The pants-type disposable diaper according to claim 10 or 11,
The belt portion includes a front belt portion arranged on the wearer's ventral side and a rear belt portion arranged on the wearer's back side,
The laminated portion has a plurality of circumferential laminated portions circumferentially provided over the front belt portion and the rear belt portion, and is provided with a plurality of circumferentially-spaced laminated portions at intervals in the vertical direction. .. The pants-type disposable diaper according to any one of claims 1 to 12,
At the upper end of the belt portion along the waistline opening, the elastic nonwoven fabric and the elastic film are not arranged, a plurality of thread-like elastic members are arranged at intervals in the vertical direction. Pants type disposable diaper.

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