WO2013161716A1

WO2013161716A1 - Absorbent article

Info

Publication number: WO2013161716A1
Application number: PCT/JP2013/061661
Authority: WO
Inventors: 貴也阿良山; 敬智向井
Original assignee: ユニ・チャーム株式会社
Priority date: 2012-04-23
Filing date: 2013-04-19
Publication date: 2013-10-31
Also published as: JP2013223689A; JP5919082B2

Abstract

A disposable diaper (1) has an absorbent body (40) disposed in, at least, an inseam region. A pair of side slits (46) designed to allow the absorbent body to curve convexly are formed in the inseam region. In a planar view, the intersection (P2) of the following lines is located rearwards of the side slits (46): a line (T1) tangent to a leg opening at the location of a halfway line (L1) that passes through the widthwise halfway point between a widthwise edge of a rear waist region and the widthwise center of a side curved section; and a side-curved-section line (L2) that passes through the widthwise center of the side slits and extends in the front-rear direction.

Description

Absorbent articles

The present invention relates to an absorbent article having a curved portion that can bend the absorber.

Absorbent articles have been devised in various ways to improve the wearer's wearing feeling and prevent excrement leakage. For example, Patent Document 1 discloses an absorptivity as a disposable diaper configured such that a groove portion along the front-rear direction is formed in an absorbent body that absorbs the excrement of the wearer, and the absorbent body can be bent toward the wearer. An article is disclosed.

This disposable diaper is configured such that the three grooves formed in the absorber bend when worn. The central groove part peripheral part is convex toward the wearer's excretion opening, and the middle groove part peripheral part located on the outer side in the width direction from the central groove part is convex to the opposite side of the central groove part, That is, it becomes concave with respect to the excretion opening.

That is, convex portions and concave portions are alternately formed adjacent to each other along the width direction in the absorber. The disposable diaper configured in this way is bent with the groove as a starting point when the absorbent body is worn, and therefore, the absorbent body contacting the wearer's crotch area is smaller than the disposable diaper in a state where the absorbent body is flat. Increases the absorption performance. (Patent Document 1, FIG. 2, FIG. 3, etc.)

Japanese Patent No. 4092319 (FIGS. 2 and 3 etc.)

However, the disposable diaper described above has the following problems.

The groove portion formed in the absorbent body is formed not only in the crotch region applied to the wearer's crotch but also in the rear waistline region and the front region located at the rear and front of the crotch region.

For example, the rear waistline region behind the crotch region is arranged so as to contact the wearer's buttocks. If a concave portion or a convex portion is formed in the rear waistline region, the absorber is not easily deformed into a curved shape in the front-rear direction, and the absorber may not be disposed along the roundness of the buttocks. Therefore, an absorber is not arrange | positioned along a body and there exists a possibility that fit property may fall.

Therefore, the present invention can improve the absorption performance by increasing the area of the absorbent body disposed in the crotch portion of the wearer, and can improve the fit by arranging the absorbent body along the wearer's body. An object is to provide an absorbent article.

The disposable diaper according to the present invention includes a front-rear direction (front-rear direction L) extending to the wearer's body front side and rear body side, a width direction (width direction W) orthogonal to the front-rear direction, and an inward direction toward the wearer. A crotch region (inseam region S3) applied to the crotch portion of the wearer, and a front side of the crotch region. An absorbent article comprising a front waistline region (front waistline region S1) disposed on the rear waistline region (rear waistline region S2) disposed behind the crotch region, and disposed at least in the crotch region The crotch region has an inclined portion (inclined portion 9C) that goes to the outer side in the width direction as it goes rearward in a region on the outer side in the width direction than the absorber. And having the leg rotation of the wearer A leg-hole opening (leg-hole opening 9) is formed along the crotch region, and the crotch region is configured to allow the absorber to bend outwardly in a pair. A side curved portion is formed along the front-rear direction, and passes through an intermediate point in the width direction between the widthwise end of the rear waistline region and the widthwise center of the side curved portion in plan view, and the front-rear direction A first intersection where the intermediate line along the direction intersects with the leg opening is located on the inclined part, and in a plan view, a tangent line of the leg opening at the first intersection, The gist is that a second intersection where a side curved line extending through the center in the width direction of the side curved portion and extending in the front-rear direction intersects is located behind the side curved portion.

It is a schematic perspective view of the disposable diaper which concerns on embodiment. It is an expansion | deployment top view of the disposable diaper which concerns on embodiment. FIG. 3 is a cross-sectional view in the width direction of the disposable diaper along the line X1-X′1 shown in FIG. 2. FIG. 3 is a longitudinal sectional view of the disposable diaper along the line X′2-X2 shown in FIG. 2. It is the elements on larger scale of the leg periphery opening part in the expansion | deployment top view shown in FIG. It is a back perspective view showing typically the wearing state of the disposable diaper concerning an embodiment. It is a top view of the absorber which concerns on embodiment. It is a disassembled perspective view of the absorber which concerns on embodiment. It is sectional drawing along the X1-X'1 line | wire which shows typically the wearing condition of the disposable diaper which concerns on embodiment. It is an expansion | deployment top view of the disposable diaper which concerns on the modification 1. FIG. It is an expansion | deployment top view of the disposable diaper which concerns on the modification 2. FIG. FIG. 12 is a front-rear direction cross-sectional view of the disposable diaper along the line X′3-X3 shown in FIG. 11.

Next, an embodiment of a disposable diaper as an absorbent article according to the embodiment will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic and ratios of dimensions and the like are different from actual ones. Therefore, specific dimensions and the like should be determined in consideration of the following description. Moreover, the part from which the relationship and ratio of a mutual dimension differ also in between drawings may be contained.

The disposable diaper according to the present embodiment is formed with a pair of side curved parts formed so that the absorbent body can be bent in an outward direction away from the wearer, and the legs around the region behind the side curved parts. It is configured to be pulled up by the opening and to suppress deformation due to the side bend.

(1) Whole schematic structure of disposable diaper FIG. 1: is a schematic perspective view of the disposable diaper 1 which comprises a disposable diaper in this embodiment. FIG. 2 is a developed plan view of the disposable diaper 1 according to the present embodiment. FIG. 3 is a cross-sectional view in the width direction of the disposable diaper 1 taken along line X1-X′1 shown in FIG. FIG. 4 is a cross-sectional view in the front-rear direction of the disposable diaper 1 taken along line X′2-X2 shown in FIG. The disposable diaper 1 is a pants-type disposable diaper.

The disposable diaper 1 includes a front-rear direction L extending to the wearer's body front side and a rear body side, a width direction W orthogonal to the front-rear direction L, an inward direction IN toward the wearer, and an outward direction toward the opposite side to the inner direction. And a thickness direction T having OUT.

As shown in FIG. 2, the disposable diaper 1 has a front waistline region S1 applied to the wearer's front waistline, a rear waistline region S2 applied to the wearer's back waist, and a wear in the front-rear direction L of the disposable diaper 1. A crotch region S3 that is applied to the person's crotch and is located between the front waistline region S1 and the rear waistline region S2. The crotch region S3 includes a central crotch region S32 that is narrowest when the leg is closed at the wearer's crotch region, a front crotch region S31 located between the central crotch region S32 and the front waistline region S1, and a central crotch A rear crotch region S33 located between the region S32 and the rear waistline region S2.

The front waistline edge 4 located on one outer side in the width direction of the disposable diaper 1 in the front waistline region S1 is joined to the rear waistline edge 6 located on the one outer side in the width direction of the rear waistline region S2, and the other width The disposable diaper 1 is formed in a pants shape by joining the front waistline edge portion 4 ′ located on the outer side in the direction and the rear waistline edge portion 6 ′ located on the other outside in the width direction. In the front waistline region and the back waistline region of the pant-type disposable diaper, a joint portion 11 is formed by joining the edges of each other, and the crotch region S3 is a region on the inner side in the front-rear direction than the joint portion 11. .

As shown in FIG. 1, the disposable diaper 1 is disposed in a pants-shaped state so as to surround a waist opening 8 disposed around the waist of the wearer, and to surround the wearer's legs. A pair of leg-hole openings 9 are formed. The configuration of the leg opening 9 will be described in detail later.

The disposable diaper 1 includes an absorbent body 1A including a top sheet 10, an absorber 40, an absorber back sheet 30, and the like, and an exterior body 1B including a front exterior top sheet 70F, a rear exterior top sheet 70R, an exterior back sheet 80, and the like. These are joined to each other by an adhesive, heat fusion, or the like.

The exterior body 1B includes a front exterior topsheet 70F, a rear exterior topsheet 70R, and an exterior backsheet 80, and constitutes an exterior portion of the disposable diaper 1. The front exterior topsheet 70F is disposed across the front waistline region S1 and the front crotch region S31. The rear exterior topsheet 70R is disposed across the rear waistline region S2 and the rear crotch region S33. The front exterior topsheet 70F and the rear exterior topsheet 70R are spaced apart in the front-rear direction, and are disposed between the exterior backsheet 80 and the absorbent main body 1A in the thickness direction.

The front exterior topsheet 70F and the rear exterior topsheet 70R can be formed of an air-through nonwoven fabric, a spunbond nonwoven fabric, an SMS nonwoven fabric, a waterproof film, or the like. The front exterior topsheet 70F and the rear exterior topsheet 70R according to this embodiment are formed of an SMS nonwoven fabric having a basis weight of 15 g / m ^{2 made} of polypropylene.

The exterior backsheet 80 is located on the outer side when worn, that is, on the side away from the wearer's skin. The exterior backsheet 80 is disposed from the front waistline region S1 to the rear waistline region S2. The front-rear direction end of the exterior backsheet 80 is folded back to the skin contact surface side, and is disposed so as to wrap around the front-end outer end in the front-rear direction of the front exterior topsheet 70F (or the rear exterior topsheet 70R).

The exterior backsheet 80 can be formed of an air-through nonwoven fabric, a spunbond nonwoven fabric, an SMS nonwoven fabric, a waterproof film, or the like. The exterior backsheet 80 according to this embodiment is formed of a spunbonded nonwoven fabric having a basis weight of 17 g / m ^{2 made} of polypropylene.

The absorbent main body 1A includes a top sheet 10, a second sheet 15, an absorber back sheet, and a leak-proof portion, and is disposed closer to the wearer than the exterior body 1B.

The top sheet 10 is a sheet that forms a skin contact surface that can be in direct contact with the skin of the wearer. The top sheet 10 is disposed closer to the skin contact surface than the absorber 40. The top sheet 10 is formed of a liquid-permeable sheet such as a hydrophilic nonwoven fabric or woven fabric, an apertured plastic film, or an apertured hydrophobic nonwoven fabric. The surface sheet 10 according to the present embodiment is formed of a hydrophilic point bond nonwoven fabric having a basis weight of 23 g / m ^{2 made} of polypropylene.

The second sheet 15 is joined to the non-skin contact surface side of the top sheet 10. The second sheet 15 is disposed between the top sheet 10 and the absorber 40. By providing the second sheet 15, the absorption speed of the body fluid can be increased and the return of the body fluid after absorption can be suppressed.

The topsheet 10 and the second sheet 15 according to the present embodiment are joined by an adhesive. For example, an air-through nonwoven fabric or an opening film is used for the second sheet 15. The second sheet 15 of this embodiment is formed of 30 g / m ² (hydrophilic) air-through nonwoven fabric.

The absorber 40 is bonded to the composite sheet and the absorber back sheet by a hot melt adhesive between the composite sheet in which the top sheet 10 and the second sheet 15 are bonded and the absorber back sheet 30. Hot melt adhesives are applied respectively to the composite sheet and the back sheet, for example, by a spiral coating method, respectively painted in basis weight ^{5g / m 2, 8g / m} 2.

The rear end portion 40R of the absorber 40 is disposed in the crotch region S3, and the front end portion of the absorber 40 is disposed in the front waist region S1 at 40F. Compared with a configuration in which both the front end portion and the rear end portion of the absorbent body are arranged in the front waistline region and the back waistline region, the length of the absorbent body in the front-rear direction is short. The weight of the pulp can be reduced while maintaining. By reducing the weight of the pulp while maintaining the basis weight of the pulp, the material cost can be reduced without impairing the absorption speed of the body fluid.

Note that the absorber is not limited to the configuration of the present embodiment as long as at least a part of the absorber is disposed in the crotch region. For example, the front end 40F of the absorber 40 may be disposed in the front waistline region, and the rear end 40R of the absorber 40 may be disposed in the rear waistline region, or the front end of the absorber 40 40F may be disposed in the crotch region, and the rear end 40R of the absorber 40 may be disposed in the rear waistline region, the front end 40F of the absorber 40 may be disposed in the crotch region, and The rear end portion 40R of the absorber 40 may be disposed in the crotch region.

The absorber 40 is formed of a mixed powder such as pulverized pulp or superabsorbent polymer. The absorbent body 40 is overlapped with the first absorbent layer 41 located on the non-skin contact surface side of the wearer and the second absorbent layer 42 located on the skin contact surface side of the wearer. (See FIG. 7).

The first absorption layer 41 is formed with a central slit that constitutes the central curved portion and a side slit that constitutes the side curved portion. The central slit is formed at the center in the width direction of the first absorbent layer, and the side slits are formed at both outer sides in the width direction than the central slit. The absorbent body 40 is configured to bend when the disposable diaper 1 is worn by a central slit, a side slit, or the like formed in the absorbent body 40. The structure of the absorber will be described in detail later.

The absorber back sheet 30 is provided on the non-skin contact surface side of the absorber 40. The absorber back sheet 30 is formed of a sheet such as a liquid-impermeable film (for example, polyethylene). The absorber back sheet 30 is disposed in the outer direction OUT with respect to the absorber, is liquid-impermeable, and functions as a liquid-impermeable sheet. The absorber back sheet 30 is disposed so as to extend outward in the front-rear direction from the absorber 40.

The rear end 30R of the absorber back sheet 30 is arranged behind the rear end 40R of the absorber 40 and in the crotch region. Further, the front end portion 30F of the absorber back sheet 30 is located in front of the front end portion 40F of the absorber 40 and is disposed in the front waistline region S1.

In addition, the absorber back surface sheet 30 should just be arrange | positioned at least on the non-skin contact surface side of the absorber 40, and the position of the front-back direction is not limited to the structure of this Embodiment. For example, the front end 30F of the absorber backsheet 30 may be disposed in the front waistline region, and the rear end 30R of the absorber backsheet 30 may be disposed in the back waistline, or the absorber back surface The front end 30F of the sheet 30 may be disposed in the crotch region, and the rear end 30R of the absorber back sheet 30 may be disposed in the rear waistline region, or the front end of the absorber back sheet 30 30F may be arrange | positioned in a crotch area | region, and the rear side edge part 30R of the absorber back surface sheet 30 may be arrange | positioned in a crotch area | region.

The leak-proof part has a leak-proof side sheet 32 and a leak-proof elastic material 33, and is arranged along the front-rear direction at the width direction end of the absorber 40. The leak-proof side sheet 32 is provided so as to integrally wrap the top sheet 10 and the absorber back sheet 30 at both side ends in the width direction W of the absorber 40. The leak-proof side sheet 32 is formed of a sheet such as a liquid-impermeable nonwoven fabric. One end in the width direction of the leak-proof side sheet 32 is joined to the non-skin surface side surface of the absorber back sheet 30, and the other end in the width direction of the leak-proof side sheet 32 is the absorber. The side sheet 40 is folded back from the side in the width direction to the surface sheet side and joined to the surface of the surface sheet 10 on the skin contact surface side.

The leak-proof side sheet 32 is joined to a top sheet or the like by a hot melt adhesive. In this embodiment, a plurality of hot-melt adhesives are applied with a basis weight of 0.1 g / m ² by bead coating. Moreover, a hydrophobic nonwoven fabric sheet can be used for the leak-proof side sheet 32. In this embodiment, an SMS nonwoven fabric of polypropylene having a basis weight of 15 g / m ² was used.

The leak-proof elastic material 33 is stuck between the absorber back sheet 30 and the leak-proof side sheet 32 in an expanded state. An example of the means for fixing the leakproof elastic material is a hot melt adhesive. In the present embodiment, spandex is used as the leak-proof elastic material 33 and coating is directly performed by the V slot method. More specifically, three leak-proof elastic members 33 are stretched and fixed at a thickness of 780 dtex and a stretching factor of 2.3 times.

A waist gather 3 is provided in the front waistline region S1 and the back waistline region S2. The waist gather 3 has an elongated waist elastic material 3 A such as a synthetic rubber disposed so as to expand and contract along the width direction W of the absorber 40. The waist gather 3 is continuous from one front waistline edge 4 located on the outer side in the width direction W of the absorbent article 1 in the front waistline region S1 to the other front waistline edge 4 ′, and the absorbent article in the rear waistline region S2. 1 from the rear waistline edge 6 located on the outer side in the width direction W to the other rear waistline edge 6 ′.

The waist elastic material 3A is fixed to the front exterior topsheet 70F or the rear exterior topsheet 70R and the exterior backsheet with an adhesive (for example, a hot-melt adhesive) in a stretched state. In this embodiment, the hot-melt adhesive is applied by the V slot method.

The waist elastic material 3A is composed of spandex. In the vicinity of the waist opening 8, the waist elastic material 3 A is stretched and fixed at a thickness of 940 dtex and a stretch ratio of 3.5 times, respectively, and the thickness of 780 dtex on the inner side in the front-rear direction than the elastic material, Eight stretches are fixed at the front and rear at an expansion ratio of 3.0. In addition, the thickness, the expansion magnification, and the number of the waist elastic material 3A are not limited to the above, and can be variously set.

As a manufacturing method of the absorbent article comprised in this way, the process of shape | molding the 1st absorption layer of an absorber, the process of shape | molding the 2nd absorption layer of an absorber, a 1st absorption layer, and 2nd, for example An absorbent article can be manufactured by a method including a step of combining the absorbent layer and a step of transporting the absorbent body or the like with a belt conveyor or the like and joining with a sheet material such as a surface sheet in the course of transport. The other steps can be manufactured according to known manufacturing methods.

In addition, when a central slit or a side slit is provided in both the first absorption layer and the second absorption layer, a positional shift may occur when the first absorption layer and the second absorption layer are overlapped. For example, if a displacement occurs in the width direction, the width of the pair of side slits arranged on the left and right becomes narrow, and regular deformation becomes impossible, or the left and right unbalanced absorber becomes an adverse effect on the absorbability and wearing feeling. There is a risk of causing However, by providing a central slit or a side slit in either one of the first absorption layer and the second absorption layer, it is possible to prevent a positional shift of the side slit or the like.

In addition, for each member constituting the disposable diaper 1 described above, for example, a material described in JP-A-2006-346439 may be used.

(2) Shape of leg-hole opening FIG. 5 is a partially enlarged view of the leg-hole opening in the developed plan view shown in FIG. The leg opening 9 has an inclined portion 9 C that goes to the outer side in the width direction as it goes rearward in the region on the outer side in the width direction than the absorber 40. The inclined portion 9C has a curved shape in plan view, and is configured by an edge portion of the exterior body 1B.

The exterior body 1B is disposed so as to be recessed inward in the width direction with respect to the absorbent main body 1A in a region overlapping the absorber in plan view. In the said area | region, the width direction outer side edge part of 1 A of absorptive main bodies forms the linear leg periphery opening part 9. As shown in FIG. That is, the leg-hole opening 9 is an inclined portion 9C that is an edge toward the inner side in the width direction from the outer end in the width direction of the exterior body 1B in the crotch region, and an outer edge in the width direction of the absorbent main body 1A. It is comprised by the parallel part 9S along the front-back direction.

FIG. 6 is a rear perspective view schematically showing a wearing state of the disposable diaper according to the embodiment. The leg opening 9 is in close contact with the wearer's leg. An absorber 40 is disposed between the leg opening 9 in the width direction. In a state in which the wearer wears the disposable diaper 1, the pair of leg openings 9 are arranged along the wearer's legs, and the absorbent body 40 therebetween is pulled outward in the width direction by the leg openings. The state facing the crotch of the wearer is maintained.

In particular, an intermediate point (for example, the first intersection P1) between the widthwise end of the rear waistline region and the center of the side slit in the widthwise direction is a portion where the wearer's body swells most around the leg on the buttock side, The absorber is pulled up along the line of the opening around the leg of the part. *

In a plan view in the extended state, an intermediate line CL passing through the intermediate point in the width direction between the width direction end 1W of the rear waistline region and the width direction center 46C of the side slit 46, and along the front-rear direction, and a leg opening The first intersection point P1 where 9 intersects is located on the inclined portion 9C. Furthermore, in a plan view in the extended state, the second line where the tangent line T1 of the leg opening 9 at the first intersection P1 and the side curved line L2 passing through the center 46C in the width direction of the side slit and extending in the front-rear direction intersect. The intersection point P 2 is configured to be located behind the side slit 46.

The stretched state is a state in which the waist gathers 3 and the leg gathers are stretched to a state where no wrinkles such as the absorbent main body 1A and the exterior body 1B constituting the disposable diaper are formed.

Since the second intersection where the tangent line T1 of the leg opening at the first intersection and the side curved line L2 intersect is arranged behind the side slit, the area behind the side slit 46 is the leg opening. Pulled up by part 9.

By being pulled up by the leg opening 9, the convex deformation due to the side slits is less likely to be transmitted to the rear than the second intersection P 2. Accordingly, the front side of the second intersection point P2 is deformed into a convex shape by the side slit 46, and the rear side of the second intersection point P2 is prevented from being transmitted rearward by the deformation by the side slit 46, and is kept flat. can do. Therefore, the area | region behind a 2nd intersection can be arrange | positioned along the roundness of a collar part, and fit property can be improved.

Further, in the plan view in the extended state, the exterior body 1B constituting the leg opening 9 and the leak-proof side sheet 32 of the absorbent main body 1A intersect at the third intersection P3. The leak-proof side sheet 32 functions as a sheet member disposed along the widthwise end of the absorber. The third intersection P3 has a front third intersection on the front leg opening 9 and a rear third intersection on the rear leg opening 9. In plan view in the extended state, the fourth intersection P4 where the tangent line T2 of the leg opening 9 at each third intersection and the side curved line L2 intersect is located on the outer side in the front-rear direction than the side slit 46. The fourth intersection P4 has a front fourth intersection on the front side curve line and a rear fourth intersection on the rear side curve line.

The third intersection P3 is an intersection between the exterior body 1B and the absorbent main body 1A in the leg opening 9 and the lifting force of the leg opening 9 directly acts on the absorbent main body having the absorber 40. . The fourth intersection P4 at which the tangent line T2 of the leg opening 9 at the third intersection P3 and the side curved line L2 intersect is disposed on the outer side in the front-rear direction than the side slit 46. The front and rear regions are pulled up by the leg opening.

Specifically, the front of the rear fourth intersection is deformed into a convex shape by the side slit, and the rear of the rear fourth intersection is suppressed by the side slit, and a flat state is easily maintained. Therefore, the area behind the rear fourth intersection can be arranged along the roundness of the buttocks, and the fit can be improved. Further, the rear side of the front fourth intersection is deformed into a convex shape by the side slit, and the front side of the front fourth intersection is suppressed by the side slit, and a flat state is easily maintained. Therefore, the area in front of the front fourth intersection can be arranged along the abdomen roundness, and the fit can be improved.

Further, by pulling up the region on the outer side in the front-rear direction with respect to the side slit 46 by the leg opening, the absorber 40 can be pulled up toward the wearer, and the absorber can be brought close to the crotch of the wearer. Even in the embodiment in which the leg gathers along the leg opening 9 are not provided as in the present embodiment, the absorber can be pulled up by the leg opening and the absorption performance can be improved while suppressing the material cost.

Further, the fourth intersection P4 where the tangent T1 of the leg opening 9 at the first intersection P1 and the absorbent main body 1A intersect is at least one of the rear end 46R and the front end 46F of the side slit 46. It is desirable to be provided so as to almost overlap. According to such a configuration, the deformation of the crotch region due to the side slit 46 is further difficult to be transmitted to the rear waistline region side or the front waistline region side.

Note that “substantially overlap” in the present embodiment is a state in which the distance between the fourth intersection P4 and the front end 46F or the rear end 46R of the side slit 46 is within 50 mm. In the present embodiment, the distance between the rear fourth intersection and the rear end 46R of the side slit is 9 mm.

The leg opening 9 may have a curved shape in plan view, a linear shape in plan view, or a combination of a curved shape and a linear shape. For example, the edge of the exterior body 1B may be linear, or the edge of the absorbent main body may be curved.

(3) Structure of Absorber FIG. 7 is a plan view of the absorber 40, and FIG. 8 is a perspective view of the absorber 40. As shown in FIGS. 7 and 8, the absorbent body 40 includes a first absorbent layer 41 and a second absorbent layer 42 that is disposed closer to the skin contact surface than the first absorbent layer 41. The 1st absorption layer 41 is located in a wearer's non-skin contact surface side, and the 2nd absorption layer 42 is located in a wearer's skin contact surface side.

The absorber 40 is disposed across the crotch region S3 and the front waistline region S1. The length of the first absorbent layer 41 in the front-rear direction is longer than the length of the second absorbent layer 42 in the front-rear direction. The first absorbent layer 41 is disposed across the crotch region S3 and the front waistline region S1, and the second absorbent layer 42 is disposed in the crotch region S3. The length in the width direction of the first absorption layer 41 is longer than the length in the width direction of the second absorption layer 42. The first absorption layer 41 projects outward in the width direction from the second absorption layer 42.

The 1st absorption layer 41 and the 2nd absorption layer 42 are comprised from cotton-like pulp and a polymer absorptive polymer (SAP). Absorber 40, for example, can be formed by mixing a pulp 100 ~ 500g / ^{m 2} and SAP0 ~ 500g / ^{m 2.} The first absorbent layer 41 and the second absorbent layer 42 according to this embodiment is formed by mixing a pulp 260 g / ^{m 2} and SAP160g / ^{m 2.}

In the first absorption layer 41, a central slit 45 and a pair of side slits 46 are formed. The central slit 45 has a vertically long shape extending along the front-rear direction L, and is formed across the central crotch region S32, the front crotch region S31, and the rear crotch region S33. By forming the central slit 45 in this way, the central portion in the width direction of the absorber can be easily bent convexly in the inward direction IN on the wearer side. Moreover, the diffusibility of the body fluid etc. to the front-back direction of an absorber can be improved, a body fluid etc. can be diffused in a wide range, and absorption performance can be improved.

The pair of side slits 46 are respectively formed on the outer side in the width direction than the central slit 45. The side slit 46 has a vertically long shape extending along the front-rear direction L, and is formed in the central crotch region S32. The side slits 46 are formed in the absorber 40 along the front-rear direction L such that the side slits 46 are convex in the outward direction OUT, that is, the absorber 40 is bent in a convex opposite to the central slit 45.

Next, the deformation mode of the absorber will be described. FIG. 9 is a cross-sectional view (based on the line X1-X′1 in FIG. 2) schematically showing a wearing state of the disposable diaper 1. As shown in FIG. 9, when the disposable diaper 1 is worn, the crotch region S3 of the absorbent body is applied to the wearer's crotch. A force is applied to the absorber from the outer side in the width direction toward the inner side in the width direction by the wearer's legs and the like. When force is applied to the absorber 40 from the outer side in the width direction toward the inner side in the width direction, the absorber 40 is deformed inward and outward with the central slit 45 and the side slits 46 as base points. The cross-sectional shape along the width direction W of the disposable diaper 1 is deformed into a wave shape, and the central crotch region S32 of the crotch region S3 of the absorber 40 is regularly folded. *

In this way, even when the absorbent body is folded, the absorbent body 40 in the crotch region S3 is appropriately folded even when the area of the absorbent body is increased in order to ensure the absorption performance, and the absorbent body 40 and the excretory opening Can be brought into close contact with each other. For example, as in the present embodiment, the rear end portion of the absorbent body is disposed in the crotch region, and even if the length of the absorbent body in the front-rear direction is relatively short, the absorption performance is improved, Leakage can be suppressed.

In the absorbent body 40, the top surface of the absorbent body 40, which is convex in the inward direction IN by the central slit 45, comes into contact with the crotch portion of the wearer. The portion where the convex portion by the central slit 45 is formed is constituted only by the second absorption layer 42 and is relatively thin. On the other hand, the first absorbent layer 41 and the second absorbent layer 42 are overlapped between the convex portion due to the central slit and the convex portion due to the side slit, and the thickness is relatively thick and the rigidity is high. The convex portion by the central slit is supported by the portion having high rigidity between the central slit and the side slit, and the stability of the convex shape toward the wearer can be improved.

Further, when the wearer closes both legs, the cross-sectional shape of the disposable diaper 1 is folded around the central slit and the side slit of the absorbent body, and is placed compactly below the crotch portion in close contact with each other. Therefore, the absorption performance can be ensured while suppressing the uncomfortable feeling near the crotch part.

At this time, the inwardly convex portion formed by the central slit 45 is positioned so as to contact the wearer's crotch portion. On the other hand, the outwardly convex portion formed by the side slit 46 is convex toward the non-skin contact surface side, and is in a position where it is difficult to contact the wearer's excretion opening.

Since the absorbent body is in close contact with the wearer's crotch, it is possible to prevent leakage of bodily fluids even when urine with a slow urine speed that is transmitted to the skin is discharged. Further, in the folded state, a dent extending in the front-rear direction is formed in the bent portion away from the skin of the absorber, so that the body fluid can be diffused outward in the front-rear direction, and side leakage is prevented. be able to. Furthermore, since the side curved portion forms a concave portion, excrement can easily enter the concave portion, and direct contact between the wearer's skin and excrement can be suppressed.

The convex part formed by the central curved part is thin and high in height. Therefore, the cross-sectional shape when the absorbent body 40 is deformed by wearing the disposable diaper 1 is a tapered shape that becomes narrower from the non-skin contact surface side toward the skin contact surface side. It becomes easy to be inserted into a narrow gap in the crotch part, and it becomes easy to make close contact with the excretion opening. Since the urination opening and the absorbent body are in close contact with each other, the excreted urine can be absorbed quickly. Furthermore, the absorbent body easily fits in the gap between the crotch portions of the wearer, and does not give a sense of discomfort. Moreover, in the part close | similar to the skin of a wearer's crotch part, since the thickness of an absorber is thin and it folds so that thickness may become thick in a part far from skin, it can be made to fit without discomfort.

Next, detailed configurations of the first absorption layer 41 and the second absorption layer 42 will be described. The first absorbent layer 41 has a length in the width direction that decreases from the front crotch region S31 toward the center crotch region S32, and a length in the width direction decreases from the back crotch region S33 toward the center crotch region S32. Yes. The first absorbent layer 41 is formed with a recessed portion 41N that is recessed inward in the width direction from the front crotch region S31 toward the center crotch region S32. The recessed portion 41N is located in front of the side slit 46 and functions as a deformation suppressing portion.

Since the recess 41N is formed in front of the side slit 46, it is possible to make it difficult to transmit the deformation caused by the side slit 46 to the front waistline region S1. Therefore, it is possible to suppress the absorber 40 from being deformed into a convex shape in front of the recessed portion 41N and arrange the absorber 40 along the wearer's skin.

The second absorbent layer 42 has a substantially hourglass shape. The second absorption layer is located in the center portion in the front-rear direction and has a narrow portion 42N having a predetermined width in the width direction W, and is located in front of the narrow portion 42N, and has a width that is longer than the narrow portion. It has a wide part 42FL and a rear wide part 42RL located on the rear side of the narrow part 42N and having a width wider than that of the narrow part. The side end of the narrow portion 42N, the side end of the front wide portion 42FL, and the side end of the rear wide portion 42RL are connected by a curve, and the second absorbent layer 42 has an hourglass planar shape.

The first absorption layer 41 and the second absorption layer 42 are integrated by being pressed along the thickness direction T. In addition, the 1st absorption layer 41 and the 2nd absorption layer 42 may be integrated by the adhesive agent, heat sealing | fusion, etc. In the absorbent body 40, the first absorbent layer 41 is located on the non-skin contact surface side, and the second absorbent layer 42 is located on the skin contact surface side. The first absorbent layer 41 may be located on the skin contact surface side, located on the contact surface side.

In the width direction, the outer end of the narrow portion 42N and the inner end of the side slit 46 coincide. According to such a configuration, a difference in rigidity of the absorber 40 is formed at the end portion in the width direction of the side slit 46, and the absorber can be bent stably with the side slit 46 as a base point.

Furthermore, as shown in FIG. 2, in the width direction, the end of the second sheet 15 is located inside the side slit. The region where the second sheet 15 is disposed and the region where the second sheet 15 is not disposed (region outside the width direction end of the second sheet 15) are different in rigidity. By providing a difference in rigidity depending on the presence or absence of the second sheet, it becomes easy to bend around the side curved portion formed by the side slit 46 as a base point.

Further, the end in the width direction of the rear wide portion 42RL extends from the inner side in the width direction toward the outer side in the width direction behind the side slit. The widthwise end of the rear wide portion functions as a deformation suppressing portion 42P.

The deformation suppressing part 42P is arranged behind the side slit. The deformation suppressing part 42P is arranged so as to extend from the inner side in the width direction toward the outer side in the width direction as it goes rearward from the narrow part 42N of the second absorption layer 42. Only the first absorption layer 41 is disposed in the region in front of the deformation suppressing portion 42P, but in the region in the rear of the deformation suppressing portion 42P, the first absorption layer 41 and the second absorption layer are overlapped, A difference in rigidity of the absorber occurs in the deformation suppressing portion. Therefore, it becomes difficult to transmit the deformation in front of the deformation suppressing portion 42P to the rear.

By providing the deformation suppressing portions in front and rear of the side slits, it is possible to prevent the absorber from being deformed in the crotch region and to transmit the deformation to the rear waistline region and the front waistline region. Further, even when the front waistline region S1 and the rear waistline region S2 of the absorber are deformed, the deformation is difficult to be transmitted to the crotch region, so that the absorber 40 is stably bent into a convex shape in the crotch region S3. be able to.

Particularly, by providing the deformation suppressing portion behind the side slit 46, it is possible to suppress the deformation due to the side slit from being transmitted rearward by the lifting force by the leg opening and the deformation suppressing portion.

The deformation suppressing portion only needs to be arranged in a region behind the side slit, but more preferably, it is arranged so as to overlap at least the second intersection point P2 on the side curved portion line. By configuring the deformation suppressing portion and the second intersection point P2 to overlap each other, it is possible to further prevent the side slit deformation from being further transmitted to the rear due to the synergistic effect of the lifting force by the leg opening 9 and the deformation suppressing portion.

Further, as shown in FIG. 5, the fifth intersection P5 between the tangent line T3 of the deformation suppressing portion 42P and the side curved portion line L2 is located behind the side slit 46, and the deformation of the side slit is changed to the fifth intersection P5. This makes it difficult to transmit to the rear, and makes it easier to maintain the area behind the fifth intersection P5 in a flat state.

Furthermore, it is desirable that the tangent line T3 of the deformation suppressing portion 42P and the tangent line T1 of the leg opening 9 at the first intersection P1 are substantially parallel. According to this structure, the synergistic effect of the raising function by the leg periphery opening part 9 and the function which suppresses the deformation | transformation by a deformation | transformation suppression part can be heightened.

Note that “substantially parallel” in the present embodiment is a state where the angle formed by the tangent of the deformation suppressing portion 42P and the tangent of the leg opening at the first intersection is within 10 degrees. In the present embodiment, the difference in angle between the tangent line of the deformation suppressing portion 42P and the tangent line of the leg opening at the first intersection is 2 degrees.

The center in the front-rear direction of the side slit that constitutes the side curved portion is disposed in front of the center in the front-rear direction of the absorber, and the deformation suppressing portion 42P is disposed in the crotch region. In this way, by arranging the side slit 46 and the deformation suppressing portion 42P, the rear waistline region can be disposed along the wearer's body while the crotch region is deformed and the rear waistline region is not deformed. it can.

The deformation suppressing portion is disposed across the rear of the side curved portion from the inner side in the width direction to the outer side in the width direction than the side slit. According to such a structure, the deformation | transformation by a side curved part can be suppressed in the back of a side curved part.

It should be noted that the deformation suppressing unit can employ various configurations. Specifically, the deformation suppressing portion is a constricted portion in which the side portion of the absorber is bound inward in the width direction, a slit formed in the absorber, a low weight area that is lower in weight than the surrounding weight in the absorber, It can be comprised by at least any one among the pressing part which squeezed the absorber in the thickness direction, the width expansion-contraction member which expands-contracts in the width direction, and the absorber.

(4) Modification Next, disposable diapers according to Modification 1 and Modification 2 will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same part as the disposable diaper 1 which concerns on embodiment mentioned above, and a different part is mainly demonstrated.

FIG. 10 is a plan view of the disposable diaper according to the first modification. As for the disposable diaper which concerns on the modification 1, the absorber 40 is comprised only by 1 layer. The absorber 40 has a substantially rectangular planar shape. A central slit 45 and side slits 46 are formed in the absorber. *

The tangent line T1 of the leg opening 9 and the side curved line L2 at the first intersection P1 where the intermediate line L1 and the leg opening 9 intersect each other at the second intersection P2. The second intersection point P 2 is located behind the side slit 46. Further, a rear pressing portion 43R as a deformation suppressing portion is formed behind the side slit 46. Furthermore, the front pressing part 43F as a deformation | transformation suppression part is formed also in front of the side slit. The front pressing part 43F and the rear pressing part 43R are formed by embossing. *

Further, the inclined portion 9C at the edge of the exterior body 1B and the parallel portion 9S of the absorbent main body 1A intersect at the third intersection point P3. The tangent line T2 of the inclined portion 9C at the third intersection P3 is arranged so as to overlap the front pressing portion and the rear pressing portion. Thus, since the front pressing part and the rear pressing part are provided, it can suppress effectively that the deformation | transformation by the side slit 46 is transmitted to the front-back direction outer side exceeding a front pressing part and a rear pressing part.

FIG. 11 is a plan view of a disposable diaper according to the second modification. 12 is a front-rear direction cross-sectional view of the disposable diaper along the line X'3-X3 shown in FIG. The exterior backsheet according to Modification 2 includes a front exterior backsheet 80F joined to the front exterior topsheet 70F, and a rear exterior backsheet 80R joined to the rear exterior topsheet 70R. By disposing the exterior backsheet so as to be separated in the front-rear direction, the area of the sheet material constituting the exterior backsheet can be reduced, and the cost can be reduced.

A non-woven fabric sheet 35 is provided on the non-skin contact side of the absorber back sheet 30. The front exterior topsheet 70F and the rear exterior topsheet 70R are provided on the non-skin contact side of the nonwoven fabric sheet 35. By providing the nonwoven fabric sheet 35, it is possible to prevent the absorbent back sheet 30 of the absorbent main body 1A from being exposed in a form in which the exterior top sheet and the exterior back sheet are separated in the front-rear direction.

The front exterior topsheet 70F and the front exterior backsheet 80F are joined to the nonwoven fabric sheet 35 constituting the absorbent main body 1A in the vicinity of the front end portion 40F of the absorbent body 40. The rear exterior topsheet 70R and the rear exterior backsheet 80R are joined to the nonwoven fabric sheet 35 in the vicinity of the rear end 40R of the absorber 40.

The absorber 40 has a first absorption layer 41 and a second absorption layer 42. In the front-rear direction, the first absorption layer 41 and the second absorption layer 42 have the same length, and in the width direction, the first absorption layer 41 extends outward in the width direction from the second absorption layer 42. . A central slit and a side slit are formed in the first absorption layer 41.

The intermediate line L1 and the leg opening 9 intersect at the first intersection P1. The tangent line T1 of the leg opening 9 at the first intersection P1 and the side curved line L2 intersect at the second intersection P2. The second intersection point P 2 is located behind the side slit 46.

A leg gather 5 is provided around the leg opening 9. At least a part of the leg gather 5 is disposed along the leg opening 9. The leg gathers 5 are formed by a front leg elastic member 5F disposed in the front waistline region S1, and a rear leg elastic member 5R disposed across the rear waist region S2 and the crotch region S3. .

The rear leg elastic member 5R is disposed from the rear waistline region S2 to the crotch region S3, and is disposed so as to go inward in the width direction from the rear waistline region S2 to the crotch region S3. The front leg-holes elastic member 5F is disposed along the width direction in the front waistline region S1. The front leg elastic member 5F and the rear leg elastic member 5R in the region on the outer side in the width direction from the absorber 40 and the front leg elastic member 5F and the rear leg elastic member 5R in the region overlapping with the absorber 40 are linked and absorbed. It functions to raise the body 40 toward the wearer.

The front leg elastic member 5F is disposed between the front exterior topsheet 70F and the exterior backsheet 80, and the rear leg elastic member 5R is disposed between the rear exterior topsheet 70R and the exterior backsheet 80. Yes. The waist elastic material 3A is bonded between the front exterior topsheet 70F or the rear exterior topsheet 70R and the front exterior backsheet 80F or the rear exterior backsheet 80R.

The leakproof elastic material 33 is arranged so as to be substantially continuous with the leg gathers in plan view. By arranging the leak-proof elastic material and leg gathers in this way, it can be tightened to surround the foot of the wearer, improving the fit of the leg and improving the effect of preventing the displacement and leakage of disposable diapers. can get.

(5) Other Embodiments As described above, the contents of the present invention have been disclosed through the embodiments of the present invention. However, it is understood that the description and drawings constituting a part of this disclosure limit the present invention. Should not. From this disclosure, various alternative embodiments, examples, and operational techniques will be apparent to those skilled in the art.

For example, in the above-described embodiment, the pants-type disposable diaper has been described. However, the present invention is not limited thereto, and may be applied to an open-type disposable diaper, an incontinence pad, a sanitary napkin, and the like. Good.

In an open-type disposable diaper, for example, a locking member such as a fastening tape is provided in the rear waistline region, and a target portion on which the locking member is caught is provided in the front waistline region.

In the shape of the leg opening, it is desirable that the fourth intersection where the tangent of the inclined portion and the side curve line intersect at the third intersection is located on the outer side in the front-rear direction than the side curve. However, in the absorbent article according to the present invention, the fourth intersection point where the tangent to the inclined portion and the side curved line at the third intersection point may be located on the inner side in the front-rear direction than the side curved portion.

Moreover, the absorbent article according to the present invention does not necessarily have to be provided with a deformation suppressing portion. Even if it is a case where a deformation | transformation suppression part is provided, it may be arrange | positioned and shifted | deviated from the 2nd intersection on a side curved part line, and does not need to be arrange | positioned ranging over the side slit in the width direction.

Moreover, although the absorbent article may be provided with the center music part and the side music part, it should just be provided with the side music part at least, and does not need to provide both the center music part and the side music part. The center in the front-rear direction of the side slit may coincide with the center in the front-rear direction of the absorber, or may be arranged behind the center in the front-rear direction of the absorber. The side curved portion may be connected to the deformation control unit and may be curved so as to go from the inner side in the front-rear direction toward the outer side in the front-rear direction.

Furthermore, although the center curved part and the side curved part of this Embodiment are comprised by the slit formed in the absorber, the structure of a central curved part and a side curved part is not restricted to a slit. The central curved portion and the side curved portion may be configured by an elastic material that expands and contracts in the front-rear direction, may be configured by a compressed portion that compresses the absorbent body in the thickness direction, and the weight of the surroundings in the absorbent body You may be comprised by the low weight area comprised lower than. Furthermore, a slit may be formed in the absorber, and an elastic material that expands and contracts in the front-rear direction so as to overlap the slit may be provided, and the central curved portion and the side curved portion may be configured by the slit and the elastic material.

In the present embodiment, the absorbent body 40 has a two-absorbent layer structure of a first absorbent layer 41 and a second absorbent layer 42. However, the absorbent body 40 of the wearing article according to the present invention is configured by only one absorbent layer. It may be composed of three or more layers.

Thus, it goes without saying that the present invention includes various embodiments that are not described herein. Accordingly, the technical scope of the present invention is defined only by the invention specifying matters according to the scope of claims reasonable from the above description.

Note that the entire content of Japanese Patent Application No. 2012-098252 (filed on April 23, 2012) is incorporated herein by reference.

It is possible to provide an absorbent article capable of improving the absorption performance by increasing the area of the absorbent body disposed in the crotch portion of the wearer and improving the fit by arranging the absorbent body along the wearer's body. .

1. Disposable diapers (absorbent articles)
3 ... Waist gather 3A ... Waist elastic material 4, 4 '... Front waistline edge 5 ... Leg gather 5F ... Front leg circumference elastic material 5R ... Rear leg circumference elastic material 6, 6' ... Rear waistline edge 8 ... Waist circumference opening DESCRIPTION OF SYMBOLS 9 ... Leg circumference opening part 10 ... Surface sheet 15 ... Second sheet 30 ... Absorber back surface sheet 30F ... Front side edge part 30R ... Rear side edge part 32 ... Leakage prevention side sheet 33 ... Leakage prevention elastic material 35 ... Nonwoven fabric sheet 40 ... Absorption Body 41 ... first absorbent layer 41N ... dent 42 ... second absorbent layer 42FL ... wide front part 42N ... narrow part 42RL ... wide rear part 45 ... center slit 46 ... side slit 70F ... front exterior topsheet 70R ... rear side Exterior top sheet 80 ... Exterior backsheet 80F ... Front exterior backsheet 80R ... Rear exterior backsheet S1 ... Front waistline area S2 ... Rear waistline area S3 ... Inseam Frequency S31 ... Previous crotch region S32 ... central crotch region S33 ... rear crotch region

Claims

A front-rear direction extending to the wearer's front side and back side, a width direction orthogonal to the front-rear direction, an inward direction toward the wearer, and an outward direction opposite to the inward direction ,
An absorbent article comprising a crotch region applied to the wearer's crotch region, a front waistline region disposed in front of the crotch region, and a rear waistline region disposed behind the crotch region,
Having an absorbent body disposed at least in the crotch region;
In the crotch region, there is a leg opening that is arranged along the circumference of the wearer's leg, and has an inclined portion that goes to the outer side in the width direction as it goes rearward in the outer region in the width direction than the absorber. Formed,
In the crotch region, a pair of side curved portions configured so that the absorber can bend in the outward direction is formed along the front-rear direction,
In plan view, an intermediate line passing through the intermediate point in the width direction between the widthwise end of the rear waistline region and the widthwise center of the side curved portion, and along the front-rear direction, the leg-hole opening, Is located on the inclined portion,
In plan view, the second intersection where the tangent of the leg opening at the first intersection and the side curve line passing through the center in the width direction of the side curve and extending in the front-rear direction intersects the side An absorptive article characterized by being located behind a curved part.
A sheet member disposed along at least the widthwise end of the absorbent body;
In plan view, the widthwise end of the sheet member and the inclined portion intersect at a third intersection point,
The fourth intersection point where the tangent of the inclined portion at the third intersection point and the side curve portion line intersect with each other in a plan view is located on the outer side in the front-rear direction than the side curve portion. 2. The absorbent article according to 1.
The deformation suppression part is formed in the front-back direction outer side rather than the said side curved part so that it can suppress that the deformation | transformation of the said absorber by the said side curved part is transmitted back. Absorbent articles.
The absorbent article according to claim 3, wherein the deformation suppressing portion is disposed so as to overlap at least the second intersection point on the side curved portion line.
The deformation suppressing portion is a constricted portion in which a side portion of the absorber is bound inward in the width direction, a slit formed in the absorber, and a low weight area that is lower in weight than the surrounding weight in the absorber. The absorption according to claim 3 or 4, comprising at least one of a compressed portion obtained by pressing the absorber in the thickness direction, a width elastic member that expands and contracts in the width direction, and a difference in rigidity of the absorber. Sex goods.
The deformation suppressing portion is disposed from the inner side in the width direction to the outer side in the width direction than the side curved portion than the side curved portion, and extends toward the outer side in the width direction toward the outer side in the front-rear direction. Item 6. The absorbent article according to any one of Items 3 to 5.
The center in the front-rear direction of the side curved portion is disposed in front of the center in the front-rear direction of the absorber,
The said deformation | transformation suppression part is arrange | positioned in the said crotch area | region, and it is formed so that the deformation | transformation of the said crotch area | region may be transmitted to the said back waistline area | region. Absorbent article.
At the center in the width direction of the crotch region is formed a central curved portion configured so that the absorber can bend in the inward direction,
The absorbent article according to any one of claims 1 to 7, wherein the side curved portion is provided on the outer side in the width direction than the central curved portion.