JP3934855B2 - Disposable diapers - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a disposable diaper that absorbs and holds excrement.
[0002]
[Prior art]
Japanese Patent Application Laid-Open No. 10-272156 discloses an hourglass-type liquid-absorbing panel in which strips that are spaced apart from each other and extend continuously in the vertical direction are formed. The groove is formed by compressing the panel in the thickness direction, and a first groove extending inside both side edges of the upper surface of the panel and a second groove extending inside each of the first grooves in parallel with the first groove. It consists of a groove. The panel in which the groove is formed is excellent in shape retention, and the waste absorption rate of the panel can be improved by quickly diffusing the waste in the longitudinal direction of the panel in the groove. When the panel is used in a disposable diaper, the front part and the rear part of the panel are located in the waist area of the diaper, and the central part between the front and rear parts is located in the crotch area of the diaper.
[0003]
[Problems to be solved by the invention]
In the panel disclosed in the publication, the lateral diffusion of excrement on the upper surface of the panel is blocked by the groove. Therefore, on the upper surface of the panel, the absorption region of excrement is substantially limited to the portion between the grooves. In particular, the absorption area of excrement is narrow at the center of the panel, which is smaller in the horizontal direction than the front and rear, and the excretion absorption capacity in the crotch area of the diaper is significantly reduced when the panel is used for diapers. Resulting in.
[0004]
An object of the present invention is to provide a disposable diaper in which the excrement absorbing ability in the crotch region of a diaper is not lowered while taking advantage of the convenience of an absorbent panel formed with strips extending in the vertical direction so as to be opposed to each other. There is to do.
[0005]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention presupposes that a liquid-absorbing panel is interposed between the liquid-permeable top sheet and the liquid-impervious back sheet, and the first and second in the vertical direction. A waist area, and a crotch area positioned between the waist areas, the panel having both side edges extending in the longitudinal direction and both end edges extending in the lateral direction; The strip formed by compressing is a disposable diaper that extends in the longitudinal direction while being opposed to each other on the inner sides of both side edges of the panel.
[0006]
Under such a premise, the present invention is characterized in that the groove is divided in a vertical direction at a central portion of the panel located in the crotch region, and both longitudinal ends of the groove are It exists in the vicinity of the both-ends edge of a panel. The groove portion serves as a bending guide, and the vicinity of both side edges in the central portion of the panel is bent in the lateral direction with the upper surface of the panel being inward. Further, a leak-proof cuff that extends continuously in the vertical direction is attached to both side edges of the diaper including the crotch region , and the cuff is opposed to the fixed side portion fixed to the top sheet and the fixed side portion. Then , a free side portion having an elastic stretchable member extending in the vertical direction, and a laterally inward direction so that the free side portion is positioned above the groove when the free side portion stands by contraction of the elastic stretchable member . And having both ends fixed to the top sheet in the first and second waistline regions.
[0007]
As an example of an embodiment of the present invention, the groove has both side surfaces facing each other and extending in the longitudinal direction, and a bottom surface extending between the both side surfaces in the longitudinal direction. A large number of raised portions that protrude from the bottom surface and cross between the two side surfaces are arranged at a predetermined distance in the vertical direction.
[0008]
As another example of the embodiment of the present invention, both side edges of the panel extend in an arc inwardly in the lateral direction in the crotch region.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The details of the disposable diaper according to the present invention will be described with reference to the accompanying drawings, taking a pants-type diaper as an example.
[0010]
1 and 2 are a partially broken perspective view of the disposable diaper 1 in a worn state, shown from the front waistline region 20 side, and a development plan view of the diaper 1 of FIG. 1 shown from the side of the topsheet 2, FIG. 3 is a cross-sectional view taken along line AA in FIG.
[0011]
The diaper 1 is interposed between the liquid-permeable top sheet 2, the liquid-impervious back sheet 3, the top sheet 2 and the back sheet 3, and the entire surface is covered with a water-permeable tissue paper (not shown). The joined liquid-absorbing panel 4 is a main component. The panel 4 is joined to the inner surfaces of the top sheet 2 and the back sheet 3 via tissue paper.
[0012]
The diaper 1 includes a crotch region 21 positioned between a front waistline region 20 (first waistline region), a rear waistline region 22 (second waistline region), and front and rear waistline regions 20, 22 in the vertical direction. And both end edges 1a extending in the longitudinal direction and forming an arc inwardly in the lateral direction in the crotch region 21, and both end edges 1b extending in the lateral direction. The diaper 1 has an hourglass shape in plan view. Leak- proof cuffs 5 that extend continuously in the vertical direction are attached to both side edges 1 a of the diaper 1 including the crotch region 21 .
[0013]
In the diaper 1, the side edges 1 a of the front and rear waist regions 20, 22 that overlap in the shape of a palm are connected by a large number of heat-sealing portions 6 that are intermittently arranged in the vertical direction, and the waist opens upward in FIG. 1. A peripheral opening 7 and a pair of leg peripheral openings 8 that open to the left and right in FIG. 1 are defined.
[0014]
The panel 4 includes a front portion 4A, a rear portion 4C, and a central portion 4B which is positioned between the front and rear portions 4A and 4C and whose lateral dimension is smaller than that of the front and rear portions 4A and 4C. In the crotch region 21, it has both side edges 4 a that arc inward in the lateral direction and both end edges 4 b that extend in the lateral direction. The planar shape of the panel 4 has an hourglass shape. In the panel 4, the front part 4 </ b> A and the rear part 4 </ b> C are located in the front and rear waist areas 20 and 22 of the diaper 1, and the center part 4 </ b> B is located in the crotch area 21 of the diaper 1.
[0015]
On the upper surface side in each of the front and rear regions of the panel 4, two strips 12 are formed that extend in the longitudinal direction in parallel with each other on the inner sides of the side edges 4 a of the panel 4. Each groove 12 is spaced apart by a given dimension L3 in the lateral direction, and extends in an arc so that the distance L3 from the front and rear parts 4A, 4C of the panel 4 gradually approaches the central part 4B. Each of the groove grooves 12 is divided in the center portion 4B of the panel 4 by a given dimension L1 in the longitudinal direction, and both longitudinal end portions 12a of the groove groove 12 are located inside the both end edges 4b of the panel 4. In the groove 12, the top sheet 2 enters the inside of the groove 12, and the inner surface thereof is fixed to the groove 12.
[0016]
As shown in FIG. 3, when the diaper 1 is worn, the groove 12 becomes a bending guide part, and the vicinity of both side edges 4a of the panel 4 in the center part 4B faces the upper surface of the panel 4 inward. And bent inward in the horizontal direction. In the diaper 1, the bent portion of the panel 4 serves as a barrier, and side leakage of excrement in the crotch region 21 of the diaper 1 can be prevented.
[0017]
In the central part 4B of the panel 4, since the groove 12 is divided in the vertical direction, the lateral diffusion of excrement in the central part 4B is not blocked by the groove 12. Therefore, in the central part 4B of the panel 4, the excrement spreads toward the side edges 4a of the panel 4 on the upper surface of the panel 4, and the excrement can be absorbed from substantially the entire area of the central part 4B. In the front and rear portions 4A and 4C of the panel 4, the longitudinal end portions 12a of the groove 12 are located inside the both end edges 4b of the panel 4, so that excrement diffused in the groove 12 is the both end edges 4b of the panel 4. Never leak out.
[0018]
The dimension L1 at which the groove in the central portion 4B is divided is preferably in the range of 20 to 50 mm. In the case where the dimension L1 is less than 20 mm, the excrement cannot be sufficiently diffused in the lateral direction in the central part 4B of the panel 4, and the excretion absorbing ability in the central part 4B of the panel 4 is reduced. In the case where the dimension L1 exceeds 50 mm, the form retaining property of the panel 4 is lowered, and when the diaper 1 is worn, the vicinity of both side edges 4a of the panel 4 in the central portion 4B is hardly bent.
[0019]
The minimum separation dimension L2 from the side edge 4a of the panel to the groove 12 is preferably in the range of 10 to 30 mm. It is preferable that the lateral minimum separation dimension L3 of each groove 12 is in the range of 40 to 70 mm. The longitudinal length L4 of the groove 12 is preferably in the range of 1/2 to 4/5 with respect to the length L5 between both end edges 4b of the panel 4.
[0020]
The cuff 5 includes a fixed side portion 5a fixed to the top sheet 2, a free side portion 5b extending in the vertical direction facing the fixed side portion 5a, and a front and rear torso in a state where the cuff 5 is lying inward in the lateral direction of the diaper 1. And both end portions 5c fixed to the surface sheet 2 in the surrounding areas 20, 22 . An elastic stretchable member 13 extending in the longitudinal direction is fixed to the free side portion 5b of the cuff 5 in a state of being covered with a part of the free side portion 5b. Cuff 5, with its free sides 5b contraction of the elastic stretchable members 13, have a standing propensity above the topsheet 2, when erected, that the free side 5 covering the groove 12 in its upper (See FIG. 3).
[0021]
A plurality of waist elastic elastic members 9 extending and contracting in the waist direction are attached to the edge of the waist opening 7 in a stretched state. The elastic elastic member 9 for the waistline has a portion located on both side edges 1a of the diaper 1 interposed between both side portions 3a of the back sheet 3 and an outer portion 5d of the cuff 5, and the back sheet 3 and the cuff 5 The remaining portion is interposed between the top sheet 2 and the back sheet 3 and is fixed to at least one inner surface of the sheets 2 and 3.
[0022]
At the edge of the leg opening 8, a plurality of leg elastic elastic members 10 that extend and contract in the leg direction are attached in an extended state. The leg elastic elastic member 10 is interposed between both side portions 3 a of the back sheet 3 and the outer portion 5 d of the cuff 5, and is fixed to the inner surface of at least one of the back sheet 3 and the cuff 5. .
[0023]
A plurality of auxiliary elastic stretchable members 11 extending and retracting in the waistline direction are attached below the waistline elastic stretchable member 9 in an expanded state. The auxiliary elastic stretchable member 11 is located in the front and rear waist regions 20 and 22 and extends so as to cross the panel 4 in the waist direction. The auxiliary elastic stretchable member 11 has a portion located on both side edges 1 a of the diaper 1 interposed between both side portions 3 a of the backsheet 3 and the outer portion 5 d of the cuff 5, and at least of the backsheet 3 and the cuff 5. It is fixed to one inner surface, the remaining part is interposed between the back sheet 3 and the panel 4, and is fixed to at least the inner surface of the back sheet 3 of the back sheet 3 and the panel 4.
[0024]
In FIG. 1, each of the elastic stretchable members 9, 10, 11, 13 contracts, and a large number of the front and rear waist regions 20, 22, the edge of the leg periphery opening 8, and the free side portion 5 b of the cuff 5. A gather is formed.
[0025]
4 and 5 are a cross-sectional view taken along line B-B in FIG. 2 and a cross-sectional view taken along the line C-C in FIG. 2. The groove 12 has both side surfaces 12b extending in the vertical direction so as to face each other, and a bottom surface 12c extending in the vertical direction between the both side surfaces 12b. In the groove 12, a large number of raised portions 12d that protrude from the bottom surface 12c and cross between the both side surfaces 12b are arranged at a predetermined distance in the vertical direction. In the groove 12, the vertical diffusion of the excrement in the groove 12 is suppressed by the raised portion 12 d, and it is possible to suppress the excrement from spreading rapidly from the groove 12 toward the both edges 4 b of the panel 4. .
[0026]
In the panel 4, the groove 12 can be formed by compressing the panel 4 with a molding die at a high pressure. In the panel 4, the shape of the groove 12 can be stabilized by slightly containing moisture at the compression site or by compressing the panel 4 with heating by adding a hot-melt adhesive to the panel 4. As a specific example of compressing the panel 4, the panel 4 is supplied between hot embossing rolls that rotate opposite to each other, and the panel 4 is compressed by heating in the thickness direction with the hot embossing roll.
[0027]
At both side edges 1 a of the diaper 1, both side parts 2 a of the top sheet 2 slightly extend laterally outward from both side edges 4 a of the panel 4, and both side parts 3 a of the back sheet 3 and the outer part 5 d of the cuff 5 are on the surface. The sheet 2 extends further outward in the lateral direction from both side portions 2a. Both side portions 2 a of the top sheet 2 are interposed between the both side portions 3 a of the back sheet 3 and the outer portion 5 d of the cuff 5, and are fixed to the inner surface of at least one of the back sheet 3 and the cuff 5. Both side portions 3a of the back sheet 3 and the outer portion 5d of the cuff 5 are fixed in a state where the back sheet 3 and the cuff 5 overlap each other. In the both-ends edge part 1b of the diaper 1, the part with which the surface sheet 2 and the back surface sheet 3 which are extended in the vertical direction outward from the both-ends edge 4b of the panel 4 mutually adhere is adhering.
[0028]
The panel 4 is a mixture of fluff pulp obtained by pulverizing wood pulp, superabsorbent polymer particles, and thermoplastic synthetic resin fibers, and the whole is compressed to a required thickness. As the superabsorbent polymer, a starch graft polymer, a modified cellulose, a cross-linked product of a water-soluble polymer, a self-crosslinked alkali metal acrylate, and the like can be used.
[0029]
In panel 4, the basis weight of the pulp in the range of 150 to 350 g / ^{m 2,} the basis weight of the polymer in the range of 100 to 400 g / ^{m 2,} the basis weight of the synthetic resin fibers is in the range of 20 to 60 g / ^{m 2} Is preferred. The panel has a bending resistance of 4 to 15 g · cm in a region indicated by an imaginary line X in FIG. Although the groove 12 formed in the panel 4 is a two-way thing, in order to improve a form retainability, the groove | channel exceeding 2 articles | strands can also be formed in the panel 4. FIG. Even when the number of the grooves exceeds two, each of the grooves is divided in the vertical direction at the central portion 4B of the panel 4, and both longitudinal ends of each of the grooves are located inside the both edges 4b of the panel 4. It is necessary to do.
[0030]
As the surface sheet 2, a liquid-permeable sheet such as a nonwoven fabric or an apertured plastic film, preferably a liquid-permeable and hydrophilic sheet can be used. For the back sheet 3, a hydrophobic nonwoven fabric, a liquid-impervious plastic film, or a laminate sheet of a hydrophobic nonwoven fabric and a plastic film, preferably a gas-permeable and liquid-impervious sheet can be used. Moreover, as the back sheet 3, a composite nonwoven fabric (SMS nonwoven fabric) in which both sheet surfaces of a melt-blown nonwoven fabric having high water resistance are sandwiched between sheet surfaces of a spunbond nonwoven fabric having high strength and high flexibility is used. You can also.
[0031]
As the nonwoven fabric, those produced by spun lace, needle punch, melt blown, thermal bond, spun pond, chemical bond and the like can be used. As the constituent fibers of the nonwoven fabric, polyolefin-based, polyester-based, polyamide-based fibers, chic-and-syn type or side-by-side type composite fibers made of polyethylene / polypropylene or polyester can be used.
[0032]
Each of the elastic stretchable members 9, 10, 11, 13 is an elastomer made of natural rubber or synthetic rubber, and any of a thread shape, a filament shape, a film shape, and a belt shape can be used.
[0033]
Adhesives such as hot-melt adhesives, adhesives, or heat seals are used to secure the sheets 2 and 3 and the cuff 5 together, the panel 4 and the elastic stretchable members 9, 10, 11 and 13. Thermal welding means such as sonic seals can be used.
[0034]
The present invention can be applied to an open-type diaper in addition to a pants-type diaper.
[0035]
【The invention's effect】
According to the disposable diaper according to the present invention, the groove extending continuously in the vertical direction while being spaced apart from each other on the inner sides of the front and rear regions of the liquid-absorbing panel is provided in the vertical direction in the central portion of the panel. Since the size is divided, the excrement is not blocked by the groove, and the upper surface of the panel can be diffused in the lateral direction at the center. In the panel, since excrement can be absorbed from the entire central portion, the excretion absorbing ability of the crotch region of the diaper where the central portion of the panel is located does not decrease. In particular, it is useful for a diaper using an hourglass-type panel whose central portion is narrower than the front and rear portions. In diapers, the shape retention of the panel can be improved by forming a groove in the panel. In addition, since the leak-proof cuff attached to both side edges of the diaper is located on both side edges of the diaper including the outside of the center part of the panel where the groove is divided, the excrement opens from the center part of the panel to the leg-hole opening. Suppresses rapid diffusion toward the edges at
[0036]
In the groove, many ridges that protrude from the bottom surface of the groove and cross between both sides are arranged in the vertical direction with a given distance from each other, so that the diffusion of excrement in the vertical direction in the groove is raised. It can suppress by a part, and can suppress that excrement spreads rapidly toward a both-ends edge of a panel from a groove.
[Brief description of the drawings]
FIG. 1 is a partially broken perspective view of a disposable diaper in a worn state, shown from the side of a front waist area.
FIG. 2 is a development plan view of the diaper of FIG. 1 shown from the top sheet side.
FIG. 3 is a cross-sectional view taken along line AA in FIG.
4 is a cross-sectional view taken along line BB in FIG.
FIG. 5 is a cross-sectional view taken along the line CC of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Disposable diaper 2 Liquid-permeable surface sheet 3 Liquid-impermeable back sheet 4 Liquid-absorbing panel 4B Central part 4a Both-side edge 4b Both-ends edge 12 Strip 12a Longitudinal both-ends 12b Both-sides 12c Bottom 12d Raised part 20 Around the front trunk Area 21 Inseam area 22 Rear waist area L1 Dimensions

Claims (3)

A liquid-absorbing panel is interposed between the liquid-permeable top sheet and the liquid-impervious back sheet, and the first and second waistline regions in the longitudinal direction and a crotch region located between these waistline regions The panel has both side edges extending in the longitudinal direction and both side edges extending in the lateral direction, and a groove formed by compressing the panel in the thickness direction is provided inside the side edges of the panel. In the disposable diaper extending in the longitudinal direction so as to be opposed to each other,
The groove is divided in a longitudinal direction at a center portion of the panel located in the crotch region, and both longitudinal ends of the groove are located in the vicinity of both edges of the panel, and the groove portion Becomes a bending guide, both side edge vicinity in the central part of the panel is bent in the lateral direction with the upper surface of the panel inside,
Leak-barrier cuffs continuously extending in the longitudinal direction is attached to the side edges of the front Symbol diaper including the crotch region, the cuff, the fixed side portions secured to the topsheet, and opposite to the fixed side portions And a free side portion having an elastic stretchable member extending in the vertical direction, and when the free side portion is raised by contraction of the elastic stretchable member, it is folded inward in the lateral direction so as to be positioned above the groove. The diaper having both ends fixed to the top sheet in the first and second waistline regions.   The groove has both side surfaces facing each other and extending in the vertical direction, and a bottom surface extending in the vertical direction between the both side surfaces. In the groove, the groove is raised from the bottom surface and The diaper according to claim 1, wherein a plurality of ridges crossing each other are arranged at a predetermined distance in the longitudinal direction.   The diaper according to claim 1 or 2, wherein both side edges of the panel extend in an arc in the lateral direction in the crotch region.

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