JP2020103719A - Underpants type disposable diaper - Google Patents

Abstract

To provide an underpants type disposable diaper having good feeling of wear while supporting the movement of a wearer.SOLUTION: An underpants type disposable diaper (1) is such that: a rear side belt part (22) has a low pressure area (31) and a high pressure area (41) extending/contracting in the left and right direction; force for extending for a unit length the high pressure area (41) of a unit width in the vertical direction in the left and right direction is larger than force for extending for a unit length the low pressure area (31) of a unit width in the left and right direction; the high pressure area (41) is continuously arranged in the left and right direction between a pair of engaging parts (24); a length in the vertical direction of the high pressure area (41) is longer in both end parts in the left and right direction of the high pressure area (41), compared to the central part; a bottom edge of the high pressure area (41) is positioned downward; and the low pressure area (31) is arranged adjacently to the lower side of the high pressure area (41) in the central part in the left and right direction of the rear side belt part (22).SELECTED DRAWING: Figure 5

Description

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

Patent Literature 1 discloses a pants-type disposable diaper in which both side edges of a ventral side portion and both side edges of a back side portion are joined to each other. The back side of the diaper of Patent Document 1 includes a first body elastic member and a second body elastic member. The first body elastic member and the second body elastic member are arranged such that the intersecting portions thereof contact the greater trochanter of the wearer. By doing so, even if the diaper does not include the leg elastic members, the diaper is prevented from slipping off and leakage can be prevented.

Patent No. 5107760

However, the first body elastic member of the diaper of Patent Document 1 extends from the edge of the leg opening toward the edge of the waist opening. That is, one end of the first body elastic member is located in the leg opening and contracts so as to widen the leg opening. Therefore, it is difficult for the first body elastic member to obtain a tightening force that supports the wearer's movement (muscular strength).
The second body elastic member extends from the side edge of the back side toward the center of the back side near the crotch portion. That is, the second trunk elastic member is located at a portion that abuts the gluteus maximus muscle, which greatly expands and contracts in muscles and skin due to the movement of the wearer. Therefore, the wearer's motion easily causes friction between the wearer and the diaper, and the comfort of the diaper is deteriorated.

The present invention has been made in view of the above problems, and an object thereof is to provide a pants-type disposable diaper that is comfortable to wear while supporting the motion of the wearer.

A main invention for achieving the above-mentioned object is to have a vertical direction, a horizontal direction, and a front-back direction that intersect with each other, and both side portions of the front belt portion in the left-right direction, and both side portions of the rear belt portion in the left-right direction. Is a pants-type disposable diaper locked at a pair of locking portions, the rear belt portion has a low pressure region and a high pressure region, the low pressure region, and the high pressure region. The pressure region has elasticity in the left-right direction, and the force for extending the high-pressure region of the unit width in the vertical direction by the unit length in the left-right direction is equal to the low-pressure region of the unit width. A force larger than the force for extending the unit length in the left-right direction, the high-pressure region is continuously arranged in the left-right direction between the pair of locking portions, and the high-pressure region is The both end portions in the left-right direction of the high pressure region are longer in the vertical direction than the central portion, and the lower end of the high pressure region is located below the rear belt portion. The pants-type disposable diaper is characterized in that the low-pressure region is disposed below the high-pressure region and adjacent to the central region in the left-right direction.
Other features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

According to the present invention, it is possible to provide a pants-type disposable diaper that is comfortable to wear while supporting the motion of the wearer.

It is a schematic perspective view of a pants-type disposable diaper 1. 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 line I-I of FIG. 2. FIG. 4A is a diagram showing an example of the joint portion 50, and FIG. 4B is a schematic sectional view of the front belt portion 21 and the rear belt portion 22. It is a schematic plan view of the rear belt part 22. It is a schematic plan view of the front belt part 21. 7A and 7B are explanatory views of the gluteus medius muscle 60.

At least the following matters will be made clear by the present specification and the description of the accompanying drawings.
It has a vertical direction, a left-right direction, and a front-back direction that intersect with each other. The left and right side portions of the front belt portion and the left and right side portions of the rear belt portion are locked by a pair of locking portions. In the pants-type disposable diaper, the rear belt part has a low pressure region and a high pressure region, and the low pressure region and the high pressure region are stretchable in the left-right direction. The force for extending the high pressure region having a unit width in the vertical direction by a unit length in the horizontal direction extends the low pressure region having a unit width in the horizontal direction by the unit length. The force is larger than the force for maintaining the high pressure region continuously in the left-right direction across the pair of locking portions, and the left and right ends of the high pressure region are centrally located. The length of the high pressure region in the up-down direction is longer than that of the high pressure region, and the lower end of the high pressure region is located below the high pressure region, and the high pressure is applied to the central portion of the rear belt portion in the left-right direction. The underpants type disposable diaper is characterized in that the low-pressure region is arranged below and adjacent to the region.

According to such a pants-type disposable diaper, since the high pressure region is connected to the front belt portion, it is possible to suppress the tightening pressure in the high pressure region from being reduced. Further, the high pressure region is arranged to match the wearer's gluteus medius, and the high pressure region can tighten the gluteus medius muscles to support the wearer's motion (walking). On the other hand, the low pressure region is arranged in accordance with the gluteus maximus of the wearer, and it is possible to prevent excessive tightening of the gluteus maximus that is highly elastic, and to improve the comfort of wearing the diaper.

Such a pants-type disposable diaper, wherein the lower end of the high-pressure area is inclined downward from the center portion in the left-right direction of the high-pressure area toward both ends. is there.

According to such a pants-type disposable diaper, the high-pressure region has a shape close to the gluteus medius of the wearer, and can further support the wearer's movement (walking).

Such a pants-type disposable diaper, having an absorbent core, the high pressure region is arranged in the front-back direction so as not to overlap the rear side portion of the absorbent core, and the low pressure region is A pants-type disposable diaper, which is disposed at least between a lower end of the high pressure region and an upper end of a rear side portion of the absorbent core.

According to such a pants-type disposable diaper, it is possible to prevent the absorbent core from shrinking due to the high pressure region, and to improve the wearing comfort of the diaper.

In this pants-type disposable diaper, the front belt portion has a front stretchable member that stretches in the left-right direction, and the front stretchable member extends in the left-right direction across the pair of locking portions. The pants-type disposable diaper is characterized in that the high-pressure regions are continuously arranged and are connected to the front stretchable member at the engaging portion.

According to such a pants-type disposable diaper, the high pressure region and the front stretchable member have a circumferential shape and fit around the waist of the wearer, so that the displacement of the diaper can be suppressed. Further, the tightening pressure in the high pressure region is increased, and the wearer's motion (walking) can be further supported.

In this pants-type disposable diaper, the front belt portion has a front low pressure region having elasticity in the left-right direction and a front high pressure region having the front elastic member, and is a unit in the vertical direction. The force for extending the front high pressure region of width in the left-right direction by a unit length is larger than the force of extending the front low pressure region of the unit width in the left-right direction by the unit length. The high pressure region is a pants-type disposable diaper characterized in that the high pressure region is connected to the front high pressure region at the locking portion.

According to such a pants-type disposable diaper, the high pressure region and the front stretchable member have a circumferential shape and fit around the waist of the wearer, so that the displacement of the diaper can be suppressed. Further, the tightening pressure in the high pressure region is increased, and the wearer's motion (walking) can be further supported.

In such a pants-type disposable diaper, the front high-pressure region has a plurality of the front elastic members at intervals in the up-down direction, and the high-pressure region expands and contracts in the left-right direction. A plurality of members are provided at intervals in the vertical direction, and in the locking portion, the uppermost front elastic member and the uppermost rear elastic member are connected, and the lowest member. The pants-type disposable diaper, wherein the front elastic member on the side and the rear elastic member on the lowermost side are connected to each other.

According to such a pants-type disposable diaper, the high pressure region and the front stretchable member have a circumferential shape and fit around the waist of the wearer, so that the displacement of the diaper can be suppressed. Further, the tightening pressure in the high pressure region is increased, and the wearer's motion (walking) can be further supported.

In such a pants-type disposable diaper, the left and right ends of the front high-pressure region are longer in the up-down direction of the front high-pressure region than the central part, and the front high-pressure region is longer. The pants-type disposable diaper is characterized in that the upper end of the pressure region is located above.

According to such a pants-type disposable diaper, the gluteus medius of the side of the wearer can be tightened by the front high-pressure region, and the motion (walking) of the wearer can be further supported. In addition, it is possible to prevent the front side high pressure region from tightening the abdomen of the wearer and improve the wearing comfort of the diaper.

Such a pants-type disposable diaper, characterized in that the front low-pressure region is arranged adjacent to above the front high-pressure region in the center portion of the front belt portion in the left-right direction. It is a disposable diaper.

According to such a pants-type disposable diaper, the front low-pressure region fits properly to the wearer's abdomen, and displacement of the diaper can be suppressed.

This pants-type disposable diaper has an absorbent core, and the front high-pressure region is arranged in the front-rear direction so as not to overlap the front side portion of the absorbent core. This is a disposable diaper.

According to such a pants-type disposable diaper, it is possible to prevent the absorbent core from contracting due to the front high pressure region, and it is possible to improve the wearing comfort of the diaper.

In the pants-type disposable diaper, the high pressure region has a plurality of rear stretchable members that stretch in the left-right direction at intervals in the up-down direction, and both ends of the high-pressure region in the left-right direction. The pants-type disposable diaper is characterized in that the space between the rear stretchable members adjacent to each other in the up-down direction is wider in the part than in the central part.

According to such a pants-type disposable diaper, the length in the vertical direction of the high pressure region is longer at the left and right ends of the high pressure region than in the central portion. Therefore, the high pressure region is arranged to match the gluteus medius of the wearer, and can support the wearer's movement (walking).

In this pants-type disposable diaper, the high pressure region has a rear stretchable member that stretches in the left-right direction, and the rear stretchable member is a sheet-shaped member. This is a disposable diaper.

According to such a pants-type disposable diaper, the high-pressure region fits a wide range of the gluteus medius muscle of the wearer, and thus the wearer's motion (walking) can be further supported. In addition, since the high pressure region fits the wearer in terms of surface, local tightening can be prevented and the diaper can be comfortably worn.

In such a pants-type disposable diaper, in the high pressure region, a stretchable nonwoven fabric and a stretchable film are arranged between a skin side sheet and a non-skin side sheet, and in the low pressure region, the skin side sheet The stretchable nonwoven fabric is disposed between the non-skin side sheet and the non-skin side sheet.

According to such a pants-type disposable diaper, the high-pressure region and the low-pressure region fit the wearer in terms of surface, so that local tightening can be prevented and the diaper can be comfortably worn.

Such a pants-type disposable diaper is characterized in that an elastic member is arranged along a pair of leg openings, and is a pants-type disposable diaper.

According to such a pants-type disposable diaper, it is possible to prevent the elastic member having the opening around the leg from adhering to the wearer's leg and preventing the diaper from being pulled up too much. Therefore, the diaper is properly worn so that the high pressure region is located in the gluteus medius of the wearer.

=== 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 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 the expanded and expanded state. FIG. 3 is a schematic cross-sectional view taken along line I-I (center in the left-right direction) of FIG. FIG. 4A is a diagram showing an example of the joint portion 50 of the front belt portion 21 and the rear belt portion 22, and FIG. 4B is a schematic sectional view of the front belt portion 21 and the rear belt portion 22.

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 each member is 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 outer casing 20 has a front belt portion 21 arranged on the ventral side of the wearer, a rear belt portion 22 arranged on the back side of the wearer, and a crotch portion 23 connecting them.

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 be omitted.

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 paired with each other. By being locked at the stopper 24, 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. In addition, as a method of locking by the locking portion 24, welding or joining with an adhesive can be exemplified.

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 a seat 13. The back sheet 13 of the present embodiment has a two-layer structure of a liquid impermeable sheet 13a and a hydrophobic liquid permeable sheet (for example, hydrophobic nonwoven fabric) 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). 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 the waist regions 211 and 221 which are regions overlapping with the locking portion 24 in the vertical direction. It has crotch regions 212 and 222.

The crotch region 212, 222 has a substantially trapezoidal shape, and the lateral width (length 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, and it is possible to cover the buttocks of the wearer.

As shown in FIG. 3, the front side belt portion 21 and the rear side belt portion 22 respectively have skin side sheets 213 and 223, non-skin side sheets 214 and 224, and stretchable nonwoven fabrics 215 and 225 located between them. have. Examples of the skin-side sheets 213 and 223 and the non-skin-side sheets 214 and 224 include flexible sheets formed of spunbond nonwoven fabric, SMS nonwoven fabric, or the like. 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.

The stretchable nonwoven fabrics 215 and 225 are sheets that stretch at least in the left-right direction of the diaper 1. The stretchable nonwoven fabrics 215 and 225 are stretched fibers and non-stretchable fibers (that is, stretchable fibers having lower shrinkage than the stretchable fibers).

The stretchable nonwoven fabrics 215 and 225 include stretchable fibers of polyurethane-based elastomer, which is a type of thermoplastic elastomer having elasticity, and non-stretchable fibers of polypropylene (PP), a polyolefin-based resin that is a type of thermoplastic resin having inelasticity. An example is a nonwoven fabric in which the functional fiber has been subjected to an appropriate stretching treatment such as gear stretching. 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, the stretchability in the predetermined direction is expressed, but since the orientations of all the fibers are not always along the predetermined direction, even in the direction orthogonal to the predetermined direction. Elasticity is expressed.

The skin-side sheets 213 and 223, the non-skin-side sheets 214 and 224, and the stretchable nonwoven fabrics 215 and 225 are joined by the joining portion 50 in a state where the stretchable nonwoven fabrics 215 and 225 extend in the left-right direction. ing. As shown in FIG. 4A, the joint portions 50 may be scattered in the left-right direction and the vertical direction of the diaper 1. By doing so, when the diaper 1 contracts, the skin-side sheets 213 and 223 and the non-skin-side sheets 214 and 224 are rolled up between the joint portions 50 to form convex portions protruding outward in the thickness direction. .. On the other hand, the elastic nonwoven fabrics 215 and 225 expand in the thickness direction because the elastic fibers shrink while entangling (collecting) the non-elastic fibers. Therefore, the convex portions are supported by the fibers of the stretchable nonwoven fabrics 215 and 225 and are less likely to be crushed, and the cushioning property of the convex portions is improved. Therefore, it is possible to improve the contact of the front belt portion 21 and the rear belt portion 22 with the wearer's skin. In addition, it is possible to give the user the impression that the diaper 1 is visually soft.

The crotch portion 23 is also configured such that the stretchable nonwoven fabric 233 is arranged between the skin side sheet 231 and the non-skin side sheet 232, similarly to the front side belt portion 21 and the rear side belt portion 22. However, the configuration of the crotch portion 23 is not particularly limited, and for example, a configuration in which the elastic nonwoven fabric 233 is disposed between the absorbent main body 10 and the non-skin side sheet 232 without the skin side sheet 231 is provided. Good.

<<Regarding Low Pressure Region 30 and High Pressure Region 40>>
FIG. 5 is a schematic plan view of the rear belt portion 22. FIG. 6 is a schematic plan view of the front belt portion 21. 7A and 7B are explanatory views of the gluteus medius muscle 60.

The front belt portion 21 and the rear belt portion 22 respectively have a low pressure region 30 and a high pressure region 40 in the waistline regions 211 and 221 (see FIG. 2) that overlap the locking portion 24 in the vertical direction.

The low pressure region 30 is a region where the stretchable nonwoven fabrics 215 and 225 are arranged between the skin side sheets 213 and 223 and the non-skin side sheets 214 and 224. The high pressure region 40 is a region in which the elastic nonwoven fabrics 215 and 225 and the elastic film 43 are arranged between the skin side sheets 213 and 223 and the non-skin side sheets 214 and 224. The stretchable film 43 is a sheet that stretches at least in the left-right direction of the diaper 1. Therefore, the low pressure region 30 and the high pressure region 40 have elasticity in the left-right direction.

As the stretchable film 43, an elastic member having stretchability which is obtained by melting an elastomer resin such as urethane or styrene to form a sheet having a uniform thickness can be exemplified. 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.

The high-pressure region 40 has a higher tightening pressure when wearing the diaper than the low-pressure region 30, because the stretchable film 43 is arranged. Specifically, the force for extending the high-pressure region 40 having the unit width in the vertical direction by the unit length in the left-right direction is the force for extending the low-pressure region 30 having the unit width in the vertical direction by the unit length in the left-right direction. Greater than power. That is, the contracting force acting in the left-right direction in the high-pressure region 40 of the unit width is larger than the contracting force acting in the left-right direction in the low-pressure region 30 of the unit width, and the high-pressure region 40 strongly adheres to the wearer.

However, the stretchable film 43 is not limited to being arranged in the entire high pressure region 40. For example, as shown in FIGS. 5 and 6, a plurality of stretchable films 43A to 43F and 43a to 43f extending in the left-right direction may be arranged at intervals in the up-down direction. In this case, of the plurality of stretchable members (stretchable film 43 in this case) forming the high pressure region 40, the uppermost stretchable member (43A, 43a) and the lowermost stretchable member are stretchable. The high pressure region 40 includes the lower end of the elastic member (43F, 43f) and a region surrounded by the pair of locking portions 24 (region surrounded by abcd shown in FIG. 5, region surrounded by efgh shown in FIG. 6). And

Further, the waist rubber thread 26 is arranged on the upper end portions of the front belt portion 21 and the rear belt portion 22 of this embodiment, and the elastic nonwoven fabrics 215, 225 and the elastic film 43 are not arranged. Further, the elastic nonwoven fabrics 215 and 225 are arranged in the entire area below the waist rubber thread 26. However, the present invention is not limited to the above, and the stretchable nonwoven fabrics 215 and 225 may be arranged at the upper end portions of the front belt portion 21 and the rear belt portion 22 so as to overlap the waist thread rubber 26.

Then, in the waistline region 221 of the rear belt portion 22, a region below the high pressure region 40 is set as the low pressure region 30. On the other hand, in the waistline region 211 of the front belt portion 21, a region above the high pressure region 40 and below the waist thread rubber 26 is a low pressure region 30. When the rear belt portion 22 has the leg rubber thread 27, the portion where the leg rubber thread 27 is arranged is excluded from the low pressure region 30. However, in FIGS. 2 and 5, for the sake of clarity, the portion where the leg rubber 27 is arranged is also surrounded by a thick line as the low pressure region 30.

Further, a force for extending the high-pressure region 40 having a unit width in the vertical direction by a unit length in the left-right direction and a force for extending the low-pressure region 30 having a unit width in the vertical direction by a unit length in the left-right direction. The comparison may be performed by a known method. For example, all of the high pressure region 40 and the low pressure region 30 are cut out from the rear belt portion 22 or the front belt portion 21 as samples. Then, the average value of the vertical length of each sample is calculated. Moreover, both ends of the sample corresponding to the left-right direction of the diaper 1 are sandwiched by the chuck of the tensile tester. The load obtained in a state where the chucks are separated by a unit length and the sample is extended is measured. Then, it is advisable to compare the values obtained by dividing the load of each sample by the average value of the vertical length of each sample. When the low-pressure area 30 of the rear belt portion 22 is cut out in a range including a portion where the leg-surrounding rubber thread 27 is arranged (thick line range in FIG. 5), the leg-surrounding rubber thread 27 is stretchable. The load is measured in a state where is not expressed.

In the following description, the low pressure region 30 and the high pressure region 40 of the rear belt portion 22 are referred to as “rear low pressure region 31” and “rear high pressure region 41”, and the low pressure region 30 of the front belt portion 21. The high pressure region 40 is referred to as the "front low pressure region 32" and the "front high pressure region 42".

As shown in FIGS. 2 and 5, the rear high pressure region 41 is continuously arranged in the left-right direction between the pair of locking portions 24. If the end of the rear high pressure region 41 is located at the edge of the leg opening 1b, the rear high pressure region 41 contracts so as to widen the leg opening 1b, and the tightening pressure of the rear high pressure region 41 is reduced. (Adhesion) is reduced. On the other hand, in the present embodiment, the rear high pressure region 41 is connected to the front belt portion 21 via the locking portion 24. Therefore, it is possible to suppress the tightening pressure in the rear high pressure region 41 from being reduced.

Further, the left and right ends 411 of the rear high pressure region 41 have a longer vertical length (L1>L2) than the central portion 412 (L1>L2), and the rear high pressure region 41 has the same length. The lower end 41a of the pressure region 41 is located below.

That is, as shown in FIG. 7A, the rear high-pressure region 41 is arranged according to the shape of the gluteus medius muscle 60 of the wearer (human body). Therefore, when the diaper 1 is worn, the rear high-pressure region 41 can tighten the wearer's gluteus medius muscle 60, and can assist the movement of the gluteus medius muscle 60. As a result, the pelvis during movements such as walking is stable, and the movements (walking) of the wearer can be supported.

The positional relationship between the vertical lengths (L1, L2) and the lower end (41a) may be established at least at the left and right ends and the center of the rear high pressure region 41. It is preferable that the rear high pressure region 41 is formed at both end portions 411 having a length of 1/3 of the entire length from both end portions in the left-right direction and a central portion 412 therebetween.

Further, when comparing the length and position of the rear high pressure region 41, the rear high belt region 22 may be stretched without wrinkles. Specifically, the rear belt portion 22 is stretched until the dimension of the member (for example, the skin side sheet 223 or the like) forming the rear belt portion 22 becomes equal to or close to the dimension of the single member. It is in a state. The same applies to comparison of other lengths and positions described later.

Further, a rear low-pressure region 31 is arranged below the rear high-pressure region 41 and adjacent to the rear-side belt portion 22 at the center in the left-right direction. Specifically, it suffices that the rear low-pressure region 31 is located at least in the center of the rear belt portion 22 in the left-right direction, and it is preferable that the rear belt portion 22 is ⅓ of the entire length from both ends in the left-right direction. It is preferable that the rear low-pressure region 31 is located at the center portion between the two ends.

As shown in FIG. 7A, only the gluteus maximus muscle 61, which does not overlap with the gluteus maximus muscle 60, is located in the center of the gluteus of the wearer (human body). The central part of the buttocks, where only the gluteus maximus muscle 61 is located, greatly expands and contracts during movements such as sitting and walking. Therefore, if the rear high pressure region 41 is located at the center of the buttocks, friction easily occurs between the wearer and the diaper 1, and the comfort of wearing the diaper 1 is reduced. On the other hand, in the present embodiment, the rear low-pressure region 31 is arranged so as to match the center of the buttocks. Therefore, it is possible to reduce the friction generated between the wearer and the diaper 1 without excessively tightening the central portion of the buttocks where the muscles and the skin expand and contract greatly, and to improve the comfort of wearing the diaper 1.

Further, since the rear low-pressure region 31 has elasticity, it can be appropriately fitted to the center of the buttocks, and the displacement of the diaper 1 can be suppressed. As a result, the rear high pressure region 41 is kept fitted to the gluteus medius muscle, and the wearer's motion support (walking support) is maintained.

Further, it is preferable that the lower end 41a of the rear high pressure region 41 is inclined downward from the center portion 412 in the left-right direction of the rear high pressure region 41 toward both end portions 411. That is, it is preferable that the length of the rear high-pressure area 41 in the vertical direction gradually increases from the center portion 412 in the left-right direction of the rear high-pressure area 41 toward both ends 411.

By doing so, the rear high-pressure region 41 has a shape closer to the gluteus medius muscles 60 (FIG. 7A) of the wearer. Therefore, the support force of the gluteus medius muscle 60 by the rear high pressure region 41, that is, the motion support force (walking support force) of the wearer is increased. In addition, although the lower end 41a of the rear high pressure region 41 illustrated in FIG. 5 is inclined in a smooth curved shape, it is not limited to this and may be inclined in a linear shape or a stepped shape, for example.

Further, the rear high pressure region 41 is preferably arranged in the front-rear direction (in the thickness direction of the rear belt portion 22) so as not to overlap the rear side portion of the absorbent core 11. By doing so, it is possible to prevent the absorbent core 11 from contracting in the left-right direction due to the rear high pressure region 41 having a strong contracting force, and the absorbent core 11 having a large thickness to have an uneven shape. That is, since the flatness of the absorbent core 11 is maintained and the user does not feel uncomfortable when wearing the absorbent core 11, it is possible to improve the wearing comfort of the diaper 1. The rear side portion of the absorbent core 11 is a portion on the rear side (back side) of the center of the absorbent core 11 in the longitudinal direction. Further, the present invention is not limited to the above, and the rear high pressure region 41 and the absorbent core 11 may overlap.

Further, the rear low pressure region 31 is preferably arranged at least between the lower end 41a of the rear high pressure region 41 and the upper end 11a of the rear side portion of the absorbent core 11. By doing so, the rear low-pressure region 31 can be appropriately fitted to a wider range of the gluteus maximus of the wearer. Therefore, the displacement of the diaper 1 can be suppressed.

Further, it is preferable that the rear low-pressure region 31 extends in the left-right direction not only in the center portion of the rear belt portion 22 in the left-right direction but also in at least a part of both end portions. Specifically, it is assumed that the length from the both ends in the left-right direction of the rear belt portion 22 is 1/3 of the entire length, and the rear low pressure region 31 is arranged at least at a part of both end portions thereof. Good. More preferably, the rear low-pressure region 31 may be disposed between the pair of locking portions 24. By doing so, the rear low-pressure region 31 can be appropriately fitted to a wider range of the gluteus maximus of the wearer.

Further, as shown in FIG. 6, the stretchable film 43 (front stretchable member) included in the front high pressure region 42 may be continuously arranged in the left-right direction between the pair of locking portions 24. .. Then, in the locking portion 24, the rear high pressure region 41 may be connected to the front high pressure region 42. That is, in the locking portion 24, the positions of the rear side high pressure region 41 and the front side high pressure region 42 in the vertical direction may be partially or entirely aligned.

By doing so, the rear high pressure region 41 and the front high pressure region 42 form an annular expansion/contraction region. Therefore, the diaper 1 fits around the wearer's waist, and the displacement of the diaper 1 can be suppressed. Further, since the tightening pressure of the rear high pressure region 41 increases, the support force of the middle gluteus medius 60 by the rear high pressure region 41 increases.

In the rear high pressure region 41 and the front high pressure region 42 of the present embodiment, the elastic films 43A to 43F (rear elastic members) and 43a to 43f (front elastic members) are spaced vertically. Multiple are arranged. In this case, in the locking portion 24, the uppermost stretchable films 43A and 43a are preferably connected to each other, and the lowermost stretchable films 43F and 43f are preferably connected to each other. By doing so, the above effect can be obtained. Preferably, the second stretch films 43B and 43b from the top, the third stretch films 43C and 43c from the top, the fourth stretch films 43D and 43d from the top, and the fifth stretch film from the top 43E and 43e are preferably connected to each other at the locking portion 24.

However, the present invention is not limited to the above, and the rear high pressure region 41 and the front high pressure region 42 (front stretchable member) may be arranged in the engaging portion 24 so as to be displaced in the vertical direction. Further, the front belt portion 21 may not have the high pressure region 40, or may not have the elastic member. For example, the elastic film 43 may not be arranged on the front belt portion 21, and only the elastic nonwoven fabric 215 may be arranged. Further, instead of the stretchable film 43 and the stretchable nonwoven fabric 215, a thread-like elastic member such as thread rubber may be arranged. Also in these cases, the stretchable nonwoven fabric 215 and the thread-like elastic member are preferably continuous in the left-right direction between the pair of locking portions 24 and are connected to the rear high pressure region 41 at the locking portions 24. .. By doing so, the above effect can be obtained.

Further, as shown in FIG. 7B, the gluteus medius muscle 60 is located from the back side to the side portion of the human body. Therefore, as shown in FIG. 6, the left and right ends 421 of the front high-pressure region 42 are longer in the up-down direction of the front high-pressure region 42 than the central portion 422 (L3>L4). In addition, the upper end 42a of the front high pressure region 42 may be located above.

In this way, when the left and right ends 421 of the front high-pressure region 42 are located relatively above and the vertical length (L3) is long, the front high-pressure region 42 is located inside the wearer's side. Can be attached to the gluteus. Therefore, the rear high pressure region 41 and the front high pressure region 42 can tighten a wider range of the gluteus medius of the wearer. Therefore, the wearer's motion support (walking support) is enhanced.

On the other hand, the center portion 422 in the left-right direction of the front high-pressure region 42 is located relatively below and below the bulge of the wearer's abdomen. Therefore, it is possible to improve the comfort of wearing the diaper 1 without excessively tightening the abdomen of the wearer in the front high pressure region 42.

The positional relationship between the vertical lengths (L3, L4) and the upper end (42a) may be established at least at the left and right ends and the center of the front high pressure region 42. Preferably, both ends 421 having a length of 1/3 of the entire length from both ends in the left-right direction of the front side high pressure region 41 and a central part 422 therebetween are preferably established. However, the shape of the front high pressure region 42 is not limited to the above.

Further, in the center portion of the front belt portion 21 in the left-right direction, the front low pressure region 32 may be arranged adjacent to above the front high pressure region 42. Specifically, at least the front low-pressure region 32 needs to be located at the center of the front belt portion 21 in the left-right direction, and is preferably 1/3 of the entire length from both ends of the front belt portion 21 in the left-right direction. It is preferable that the front low-pressure region 32 is located at the center between the two ends. By doing so, the front low-pressure region 32 can be appropriately fitted to the abdomen of the wearer, and the displacement of the diaper 1 can be suppressed.

Further, the front high pressure region 42 is preferably arranged in the front-rear direction so as not to overlap the front portion of the absorbent core 11. By doing so, it is possible to prevent the front side high pressure region 42 from contracting the absorbent core 11 in the left-right direction. Therefore, the flatness of the absorbent core 11 is maintained, and it is difficult for the user to feel uncomfortable when wearing the absorbent core 11, and the comfort of wearing the diaper 1 can be improved. In addition, the front side portion of the absorbent core 11 is a portion on the front side (abdominal side) of the longitudinal center of the absorbent core 11. Further, the present invention is not limited to the above, and the front high pressure region 42 and the absorbent core 11 may overlap.

Moreover, it is preferable that the stretchable films 43A to 43F and 43a to 43f respectively provided in the rear high pressure region 41 and the front high pressure region 42 are arranged in a plurality at intervals in the vertical direction. In the region between the stretchable films 43 adjacent to each other in the vertical direction, the number of laminated sheets is smaller than that in the region in which the stretchable film 43 is arranged, so that the air permeability in the thickness direction is good. Therefore, the moist air in the diaper 1 can be discharged from the region between the stretchable films 43 to the non-skin side in the thickness direction, and the stuffiness in the diaper 1 can be suppressed. Therefore, it is possible to improve the wearing comfort of the diaper 1.

In particular, when the stretchable film 43 is arranged in the high pressure region 40, the air permeability in the thickness direction is lower than when the stretchable nonwoven fabric or the thread-like elastic member is arranged. Therefore, it is preferable to arrange the stretchable films 43 at intervals in the vertical direction. However, the present invention is not limited to the above, and the stretchable film 43 may be arranged in the entire high pressure region 40.

Further, in each of the rear high pressure region 41 and the front high pressure region 42, the left and right end portions 411, 421 are more vertically adjacent to the elastic films 43A to 43F than the central portions 412, 422. It is advisable to widen the interval (length in the vertical direction) of 43a to 43f. By doing so, in each of the rear side high pressure region 41 and the front side high pressure region 42, the left and right end portions 411, 421 are longer in the vertical direction than the central portions 412, 422 ( L1>L2, L3>L4). Therefore, the rear high pressure region 41 and the front high pressure region 42 can fit the gluteus medius muscle.

Further, it is preferable that the stretchable member (here, the stretchable film 43) arranged in the rear high pressure region 41 and the front high pressure region 42 is a sheet-shaped stretchable member.

By doing so, the rear high-pressure region 41 and the front high-pressure region 42 fit in the wearer's gluteus dorsi in a plane, and thus a wider range of the wearer's gluteus medius can be tightened. Therefore, the wearer's motion support (walking support) is enhanced. Further, when it is attempted to obtain the same tightening pressure as that of the sheet-like elastic member by the thread-like elastic member, it is necessary to increase the extension ratio of the thread-like elastic member. Then, the thread-like elastic member locally adheres to the wearer, and the comfort of wearing the diaper 1 is reduced.

Similarly, the stretchable members (here, the stretchable nonwoven fabrics 215 and 225) arranged in the rear low pressure region 31 and the front low pressure region 32 are also preferably sheet-shaped stretchable members. By doing so, the rear low-pressure region 31 and the front low-pressure region 32 fit in the surface of the wearer's abdomen and gluteus maximus, so that the abdomen and gluteus maximus are not locally tightened, and the diaper 1 You can improve your comfort. A stretchable nonwoven fabric may be arranged instead of the stretchable film 43, and the stretchable nonwoven fabric may be laminated in two layers in the high pressure region 40.

However, it is not limited to the above. For example, the thread-like elastic members are arranged at intervals in the vertical direction over a wide range of the front side belt portion 21 and the rear side belt portion 22 to form the low pressure region 30 and the high pressure region 40 is formed in a portion. Alternatively, another stretchable member (stretchable film, stretchable non-woven fabric, thread-like elastic member, etc.) may be arranged so as to be superposed on the thread-like elastic member. On the contrary, the sheet-shaped stretchable members (stretchable film, stretchable nonwoven fabric) are arranged over a wide range of the front belt portion 21 and the rear belt portion 22 to form the low pressure region 30, and the high pressure region 40. A thread-like elastic member may be arranged on the sheet-shaped stretchable member in a region where the thread-like elastic member is formed. In addition, the stretchable film is arranged over a wide range of the front belt portion 21 and the rear belt portion 22 to form the low pressure region 30, and the high pressure region 40 is formed on the stretchable film. A sheet-like stretchable member (stretchable film, stretchable nonwoven fabric) may be arranged. Further, the configurations of the low pressure region 30 and the high pressure region 40 may be the same, and the expansion ratio of the elastic member in the high pressure region 40 may be higher than the expansion ratio of the elastic member in the low pressure region 30.

Moreover, it is preferable that the leg rubber thread 27 (elastic member) is arranged along the pair of leg openings 1b of the diaper 1. By doing so, the thread rubber 27 for leg circumference comes into close contact with the wearer's leg circumference (the contour portion of the buttocks), so that it is possible to prevent the diaper 1 from being pulled up too much during wearing or during wearing. Therefore, the rear high pressure region 41 is maintained in a state of being fitted to the gluteus medius muscle, and the motion support (walking support) of the wearer is maintained. Instead of the rubber thread, a sheet-shaped elastic member may be arranged along the leg opening 1b. Further, not limited to the above, the elastic member may not be arranged along the leg opening 1b.

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 not for limiting the interpretation of the present invention. Further, it is needless to say that the present invention can be modified or improved without departing from the gist thereof and that the present invention includes equivalents thereof.

1 diaper (pants-type disposable diaper),
10 absorbent body, 11 absorbent core, 12 topsheet, 13 backsheet,
20 exterior body, 21 front belt part, 22 rear belt part,
213, 223 skin side sheet, 214, 224 non-skin side sheet,
215, 225 Stretchable nonwoven fabric (front stretchable member),
23 crotch part, 24 locking part,
26 waist elastics, 27 leg elastics,
30 low pressure region, 31 rear low pressure region (low pressure region),
32 front low pressure area,
40 high pressure area, 41 rear high pressure area (high pressure area),
42 front high pressure area,
43 stretchable film (rear stretchable member, front stretchable member),
50 joints, 60 gluteus medius, 61 gluteus maximus,

Claims (13)

It has a vertical direction that intersects with each other, a horizontal direction, and a front-back direction,
The pants-type disposable diaper in which the left and right side portions of the front belt portion and the left and right side portions of the rear belt portion are locked by a pair of locking portions,
The rear belt portion has a low pressure region and a high pressure region,
The low pressure region and the high pressure region have elasticity in the left-right direction,
The force for extending the high-pressure region of the unit width in the vertical direction by the unit length in the left-right direction is the force for extending the low-pressure region of the unit width in the left-right direction by the unit length. Greater than
The high pressure region is arranged continuously in the left-right direction across the pair of locking portions,
The left and right ends of the high pressure region are longer than the central part in the vertical direction of the high pressure region, and the lower end of the high pressure region is located below,
The underpants type disposable diaper characterized in that the low pressure region is arranged below and under the high pressure region at the center of the rear belt portion in the left-right direction. The pants-type disposable diaper according to claim 1,
A pants-type disposable diaper characterized in that the lower end of the high pressure region is inclined downward from the center of the high pressure region in the left-right direction toward both ends. The pants-type disposable diaper according to claim 1 or 2,
Has an absorbent core,
The high pressure region, in the front-rear direction, is arranged without overlapping the rear side of the absorbent core,
The underpants type disposable diaper characterized in that the low pressure region is arranged at least between a lower end of the high pressure region and an upper end of a rear side portion of the absorbent core. The pants-type disposable diaper according to any one of claims 1 to 3,
The front belt portion has a front elastic member that expands and contracts in the left-right direction,
The front stretchable member is continuously arranged in the left-right direction across the pair of locking portions,
The high-pressure region is connected to the front stretchable member at the engaging portion, and the pants-type disposable diaper is characterized in that. The pants-type disposable diaper according to claim 4,
The front belt portion has a front low pressure region having elasticity in the left-right direction, and a front high pressure region having the front elastic member,
The force for extending the front high pressure region of the unit width in the vertical direction by the unit length in the left and right direction is for extending the front low pressure region of the unit width by the unit length in the left and right direction. Greater than the power of
The high-pressure area is connected to the front high-pressure area at the locking portion, and the pants-type disposable diaper is characterized in that: The pants-type disposable diaper according to claim 5,
The front side high pressure region has a plurality of the front side stretchable members at intervals in the vertical direction,
The high-pressure region has a plurality of rear stretchable members that stretch in the left-right direction with a space in the up-down direction,
In the locking portion, the uppermost front stretchable member and the uppermost rear stretchable member are connected, and the lowermost front stretchable member and the lowermost rear side are connected. A pants-type disposable diaper characterized by being connected to a stretchable member. The pants-type disposable diaper according to claim 5 or 6,
The left and right ends of the front high pressure region are longer in the vertical direction of the front high pressure region than the central part, and the upper end of the front high pressure region is located above. The pants-type disposable diaper that is characterized by The pants-type disposable diaper according to claim 7,
The pants-type disposable diaper characterized in that the front low-pressure region is arranged adjacent to above the front high-pressure region at the center of the front belt portion in the left-right direction. The pants-type disposable diaper according to any one of claims 5 to 8,
Has an absorbent core,
The pants-type disposable diaper characterized in that the front high-pressure region is arranged in the front-rear direction so as not to overlap the front side of the absorbent core. The pants-type disposable diaper according to any one of claims 1 to 9,
The high-pressure region has a plurality of rear stretchable members that stretch in the left-right direction with a space in the up-down direction,
The pants-type disposable diaper characterized in that, in the left and right ends of the high pressure region, the distance between the rear stretchable members that are adjacent to each other in the up and down direction is wider than that in the center. The pants-type disposable diaper according to any one of claims 1 to 10,
The high pressure region has a rear stretchable member that stretches in the left-right direction,
The pants-type disposable diaper, wherein the rear stretchable member is a sheet-shaped member. The pants-type disposable diaper according to claim 11,
In the high pressure region, a stretchable nonwoven fabric and a stretchable film are arranged between the skin side sheet and the non-skin side sheet,
In the low pressure region, the stretchable nonwoven fabric is arranged between the skin-side sheet and the non-skin-side sheet, and the pants-type disposable diaper is characterized. The pants-type disposable diaper according to any one of claims 1 to 12,
A pants-type disposable diaper, wherein elastic members are arranged along a pair of leg openings.

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