JP2001061888A - Disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a pocket without attaching an end sheet. SOLUTION: A first area 23 extending crosswise while being spaced apart longitudinally outwardly from the end edge 4b of a core 4 by the required dimension and a second area 24 extending crosswise between the end edge 4b of the core 4 and the first area 23 are defined in the rear girth area 22 of a diaper, the rigidity of the second area 24 being lower than that of the first area 23 and that of a third area in which the core 4 intervenes. The longitudinal end 6c of a cuff 6 is secured on the first area 23 and the first area 23 is drawn in the direction of the third area 25 by the contraction of the cuff 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disposable diaper for absorbing and retaining human excrement.

2. Description of the Related Art Japanese Unexamined Patent Publication No. Hei 10-328234 discloses a pair of leak-proof cuffs having a liquid-absorbent core interposed between a top sheet and a back sheet and opposed to each other and extending in the longitudinal direction. A disposable diaper having a pair of end cuffs located in a region and extending in a width direction between leak-proof cuffs is disclosed. The end cuff has a fixed end fixed to the top sheet along both ends of the front and rear waist region, a free end facing inwardly of the diaper, and both side edges fixed to the leak-proof cuff. And an elastic member is attached to the free end in an extended state. In this diaper, the top sheet and the end cuff form a pocket that opens inward in the longitudinal direction of the diaper, thereby preventing leakage of excrement from the front and rear ends of the diaper.

SUMMARY OF THE INVENTION Japanese Patent Laid-Open No. Hei 10-3282
In the diaper disclosed in Japanese Patent Publication No. 34, an end cuff must be attached to the waist region in order to form pockets that open inward in the front and rear waist regions. When the diaper is worn, the front and rear waist regions of the diaper are pressed by the abdomen and the back of the wearer, so that the top sheet and the end cuff may be in close contact with each other and the pocket may be closed. An object of the present invention is to provide a disposable diaper in which a pocket can be formed without attaching an end sheet to the front and rear waist regions, and the pocket is difficult to close when worn.

In order to solve the above-mentioned problems, the present invention provides a liquid-permeable topsheet, a liquid-impermeable backsheet, and a liquid-absorbing core interposed between the sheets. A laminated panel is configured, wherein the panel is located in a front waist region, a rear waist region, a crotch region located between the front and rear waist regions, and a longitudinal direction located outside both side edges of the core. A disposable diaper comprising a pair of side flaps extending and a pair of leak-proof cuffs extending in the longitudinal direction near both side edges of the core and having an upward tendency toward the panel by elastic elasticity is improved. It is in. A feature of the present invention according to the improvement is that at least one of the front and rear waist regions includes a first region extending in the width direction at a predetermined distance from the edge of the core outward in the longitudinal direction, A second region extending in the width direction is defined between the edge of the core and the first region, and the rigidity of the second region is defined by a third region in which the first region and the core are interposed. , So that the first region can be pulled in the direction of the third region by contraction of the cuff,
A longitudinal end located in the front and rear waist region of the cuff is fixed to at least the first region of the first region and the second region. As an example of an embodiment of the present invention, the stiffness of the first to third regions is in a relationship of the first and third regions> the second region, and the stiffness value measured by the Gurley method is The range is 0.05 to 0.5 mg in three regions, and 0.1 to 0.5 mg in the first region.
In the range of 1 to 2.0 mg, 0.01 to 0.
93.3% of the section of the cuff cut from the diaper in the range of 2 mg to the total longitudinal length of the section.
Tensile force required to elongate to 20 to 300 gf
In the range. As another example of the embodiment of the present invention, the length of the first region in the longitudinal direction is 10 to 70 m.
m, the dimension of the second region in the longitudinal direction is 5 to 7
It is in the range of 0 mm. As another example of an embodiment of the present invention, a longitudinal end portion of the cuff is fixed to the inside of the panel in a state of being laid down. As another example of the embodiment of the present invention, the first region is formed of an elastically stretchable sheet-like polyurethane foam, a synthetic rubber foam, a polystyrene foam, or an elastically stretchable urethane film. Either of them is fixedly extended between the top sheet and the back sheet.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the disposable diaper according to the present invention will be described below with reference to the accompanying drawings. 1 and 2 are a partially cutaway perspective view of a diaper and FIG.
3 is a sectional view taken along line AA of FIG. The diaper is interposed between the liquid-permeable top sheet 2, the liquid-impermeable back sheet 3, and the top sheet 2 and the back sheet 3, and is bonded to at least one of the inner surfaces of the sheets 2 and 3. And a laminated panel 1 having a conductive core 4. Panel 1
The front waist region 20 and the rear waist region 22 in the longitudinal direction,
Inseam area 2 located between these front and rear waist areas 20 and 22
And 1. The panel 1 includes a pair of side flaps 5 located outside the side edges 4 a of the core 4 and extending in the longitudinal direction of the panel 1, and a pair of side flaps 5 extending in the longitudinal direction of the panel 1.
And a pair of leak-preventing cuffs 6 having a propensity to stand upward. In the rear waist region 22 of the panel 1, the edge 4b of the core 4 is provided.
And a first area 23 extending in the width direction of the panel 1 at a predetermined distance outward in the longitudinal direction, and is located between the edge 4b of the core 4 and the first area 23 and extending in the width direction of the panel 1. Second
A region 24 is formed. In the panel 1, the second region is located between the first region 23 and the third region where the core 4 is interposed.
The region 24 forms a pocket P1 opening inward in the longitudinal direction of the panel 1, and the second region 24 and the cuff 6 form a pocket P2 opening inward in the width direction of the panel 1. In the rear waist region 22 of the panel 1, a pair of tape fasteners 10 whose base ends are attached to the panel 1 extend inward in the width direction of the panel 1. A rectangular target tape 11 serving as a fixing area of the tape fastener 10 is attached to an outer surface of the back sheet 3 in a front waist region 20 of the panel 1. The side flaps 5 extend in an inward direction in the width direction of the panel 1 in the crotch region 21. In the side flap 5, the leg-surrounding elastic member 7 is interposed between the top sheet 2 and the back sheet 3, and is fixed to at least one of the inner surfaces of the sheets 2 and 3 in an extended state. The cuff 6 is fixed to the outer surface of the top sheet 2 and extends in the longitudinal direction of the panel 1 in a fixed side edge 6a, a free side edge 6b facing the fixed side edge 6a and extending in the longitudinal direction,
It has both longitudinal end portions 6c located in the front and rear waist regions 20 and 22 of the panel 1. The elastic member 8 is attached to the cuff 6 while being stretched while being covered with the free side edge 6b. In the rear waist region 22, the longitudinal end 6 c of the cuff 6
Are fixed to the first region 23 and to the edge of the rear waist region 22 extending from the first region 23 to the outside in the longitudinal direction of the panel 1 in a state of being laid down inside the panel 1. In the front waist region 20, the longitudinal end 6 c of the cuff 6 is fixed to the edge of the front waist region 20 in a state where the cuff 6 is folded down inside the panel 1 (see FIG. 3). The cuff 6 has a dimension between the longitudinal ends 6c when the cuff 6 is extended in the longitudinal direction against the contraction force of the elastic member 8 in the range of 450 to 530 mm, and the fixed side edge 6a and the free side edge. The size between the portion 6b and the portion 6b is 20 to 50.
mm. The first region 23 is formed by a portion of the top sheet 2, a portion of the back sheet 3, and the elastic member 9 interposed between the portions of the sheets 2 and 3. The elastic member 9 is extendable and contractible in the width direction of the panel 1 and is fixed to the inner surfaces of the sheets 2 and 3 in an extended state. The second region 24 is formed by a portion of the top sheet 2 and a portion of the back sheet 3, and the inner surfaces of the portions of the sheets 2 and 3 are fixed to each other. Since the elastic member 9 and the core 4 are not interposed in the second region 24, the rigidity of the second region 24 is less than the first region 23 and the third region 2.
5 is lower than the rigidity. In the rear waist region 22, the free end 6 b of the cuff 6 is moved to the panel 1 by the contraction of the elastic member 8.
Contracts inward in the longitudinal direction of the first region 23 so that the first region 23 becomes the third region 25.
And the first region 23 is moved to the third direction.
A step is formed between the first area 23 and the third area 25 by being lifted above the panel 1 than the area 25.
In the second region 24, the site 2 located on the side of the first region 23
4a rises above the panel 1 so as to cover the upper surface of the panel 1 to form a barrier, and the portion 24a and the third
A portion 24b located on the side of the region 25 forms a pocket P1 that opens inward in the longitudinal direction of the panel 1. Since the pocket P1 is recessed below the panel 1, even if the wearer's buttocks press the pocket P1 from above to below the panel 1, the pocket P1 will not be closed. In FIG. 1, the panel 1 is bent in the longitudinal direction with its inner surface inside, and the elastic members 7, 8, 9 are released from the extended state, and gathers are formed in the rear waist region 22, the side flaps 5, and the cuff 6. Is formed. FIG. 3 is a plan view of the diaper in FIG. Each stiffness value measured by the Gurley method is 0.05 to 0.5 in the third region 25.
mg, the first region 23 is preferably in the range of 0.1 to 2.0 mg, and the second region 24 is preferably in the range of 0.01 to 0.2 mg. In these regions 23, 24, and 25, the stiffness of the first region 23 and the third region 25 only needs to be higher than that of the second region 24, and the upper and lower limits of the rigidity value may be appropriately selected. it can. The rigidity of the first region 23 is less than 0.1 mg, and the rigidity of the third region 25 is 0.0
When the amount is less than 5 mg, when the free side edge 6b of the cuff 6 contracts inward in the longitudinal direction of the panel 1, the first region 23 and the third region 25 only shrink in the longitudinal direction of the panel 1, 1
A step may not be formed between the region 23 and the third region 25, and the pocket P1 may not be formed in the second region 24. Second
If the rigidity of the region 24 is less than 0.01 mg, a large number of wrinkles are formed on the second region 24, so that the shape of the pocket P1 may not be able to be maintained. First area 23
If the stiffness value of the third region 25 exceeds 0.5 mg and the stiffness value of the third region 25 exceeds 0.5 mg, the regions 23 and 25 give the wearer a hard feel, and the wearing feeling of the panel 1 is impaired. When the rigidity of the second region 24 exceeds 0.2 mg, the second region 24 remains in a stretched state even if the free side edge portion 6b of the cuff 6 contracts inward in the longitudinal direction of the panel 1, and the first region 23 is moved to the second region 24. Cannot be pulled in the direction of the third region 25,
Pocket P1 may not be formed. Elastic member 8
Is separated from the panel 1 and the tensile force required to extend the section of the cuff 6 to 93.3% with respect to the total length in the longitudinal direction of the section is in the range of 20 to 300 gf, preferably in the range of 30 to 50 gf. It is. Section pulling force is 2
If it is less than 0 gf, depending on the rigidity of the second region 24,
Even if the cuff 6 contracts inward in the longitudinal direction of the panel 1, the first region 23 may not be able to be pulled in the direction of the third region 25. If the tensile force of the section exceeds 300 gf, depending on the rigidity of the first and second regions 23 and 24, the panel 1 is bent at the second region 24 and the first region 23 falls down to the third region 25. When the panel 1 is worn, the first region 23 must be folded back. The term "tensile force" used herein refers to the force with which a tester pulls a section when the section is elongated to 93.3% in the longitudinal direction with respect to the entire length of the section using a tensile tester, in other words, the contraction of the section. Power. The measurement of the tensile force was performed by the following method. The cuff 6 is cut off from the top sheet 2 at its fixed side edge 6a and both ends 6c in the longitudinal direction, and the total length when extended in the longitudinal direction is in the range of 450 to 530 mm, and the dimension in the width direction is in the range of 20 to 50 mm. A section of a certain cuff 6 was used as a sample. Both ends in the longitudinal direction of the section contracted by the contraction of the elastic member 8 are sandwiched between chucks of a testing machine with a dimension of about 10 mm, and the section is elongated at a speed of 100 mm / min to 93.3% of the entire length thereof. Then, the extended state was released. Again, the section was extended to 93.3% of its total length, and the force applied to the tester at that time was measured. Extending a section to 93.3% means that the total length of the section is 450
In the case of mm, approximately 400 m, which is a value obtained by multiplying 420 mm obtained by subtracting approximately 20 mm between the chucks by 0.933 and 0.933 mm.
m to extend the section. The length L1 in the longitudinal direction of the first region 23 is in the range of 10 to 70 mm, preferably in the range of 20 to 50 mm. The length L2 of the second region 24 in the longitudinal direction is in the range of 5 mm to 70 mm, preferably in the range of 15 mm to 30 mm. If the dimension L1 of the first region 23 is less than 10 mm, the area of the first region 23 that comes into contact with the wearer's skin when the panel 1 is worn becomes smaller, so that the area between the wearer's skin and the first region 23 is reduced. Excretion may leak. The dimension L2 of the second region 24 is 5
If it is less than mm, even if a step is formed between the first region 24 and the third region 25, the second region 24 will only serve as a barrier rising up above the panel 1, and the pocket P1 cannot be formed. . The dimension L1 of the first region 23 is 70 mm
Is exceeded, the third region 25 cannot be reduced in size in order to maintain the excrement absorbing function of the panel 1, which naturally has a limit in the lengthwise direction.
Must be reduced, and the dimension L2 of the second region 24 may be smaller than 5 mm. Conversely, if the dimension L2 of the second area 24 exceeds 70 mm, the dimension L1 of the first area 23 must be reduced, and the dimension L1 of the first area 23 may be less than 10 mm. First
If the dimensions L1 and L2 of the region 23 and the second region 24 each exceed 70 mm, the ratio of the first and second regions 23 and 24 to the entire panel 1 becomes extremely large, and the third region 25 becomes too small. In addition, the excrement absorbing function of the panel 1 is significantly reduced. FIG.
FIG. 4 is a cross-sectional view taken along line B. The top sheet 2 ends near the outside of the side edge of the elastic member 9, and the back sheet 3 and the cuff 6 extend further outward in the width direction from the side edge of the top sheet 2. The longitudinal end 6c of the cuff 6 is
The upper surface is fixed to the outer surface of the top sheet 2, and the inner surfaces of the back sheet 3 and the cuff 6 are fixed to each other in the side flap 5. The top sheet 2 is made of a hydrophobic nonwoven fabric treated with a hydrophilic agent or a hydrophilic nonwoven fabric formed of fibers into which the hydrophilic agent has been kneaded. Fine openings may be provided in these nonwoven fabrics. As the back sheet 3 and the cuff 6, a synthetic resin film or a laminate sheet of a synthetic resin film and a hydrophobic nonwoven fabric is used. In addition to the sheets, the cuff 6 has a tensile force of 20 to
A band-like elastic stretch sheet in the range of 300 gf can be used. When an elastic elastic sheet is used, the cuff 6 can be attached to the panel 1 while being extended in the longitudinal direction, and the attachment of the elastic member 8 to the free side edge 6b of the cuff 6 can be omitted. The core 4 is a mixture of fluff pulp and superabsorbent polymer particles, is compressed to a required thickness, and is entirely covered with a liquid-permeable sheet such as tissue paper. Elastic member 9 attached to first region 23
As the sheet, any of elastically stretchable sheet-like polyurethane foam, synthetic rubber foam, polystyrene foam, or elastically stretchable urethane film can be used. In addition to attaching the elastic members 9 to the first region 23, a hot-melt adhesive or the like may be applied between the top sheet 2 and the back sheet 3 in a strip shape as a means for increasing rigidity. In addition, a plurality of thread-like elastic members are interposed between the top sheet 2 and the back sheet 3, and the thread-like elastic members are fixed to at least one of the sheets 2 and 3 so as to have a belt-like shape. Can be interposed between the top sheet 2 and the back sheet 3, and the plastic sheet can be fixed to at least one of the sheets 2 and 3. Bonding of the core 4, elastic members 7,
For fixing and attaching 8, 9 and fixing of the sheets 2, 3 and the cuff 6, in addition to an adhesive or a pressure-sensitive adhesive such as a hot-melt adhesive, a technique of heat welding can be used. Each end 6 c of the cuff 6 may be fixed on the first region 23 in a state where the end 6 c is laid down on the outside of the panel 1, and is located outside the edge 4 b of the core 4 in the longitudinal direction and the first region 23. It may be fixed on the second region 24 provided that it is fixed on the top. In FIG. 3, the first region 23 extends outward in the width direction of the panel 1 beyond the fixed side edge 6a of the cuff 6,
What is necessary is that it is formed at least between the fixed side edges 6a of the cuff 6. The present invention applies the first and the second to the front waist region 20 in addition to or together with the rear waist region 22.
2 regions 23 and 24 are formed, and the front and rear waist regions 20 and 22 are formed.
In addition, a pocket P1 opening toward the inside in the longitudinal direction of the panel 1 and a pocket P2 opening toward the inside in the width direction of the panel 1 may be formed.

According to the disposable diaper according to the present invention,
The first region formed in one of the front and rear waist regions,
Due to the contraction of the cuff, the core is drawn toward the third region where the core is interposed, and a step is formed between the first region and the third region, and the second region located between the first region and the third region is formed.
The region forms a pocket that opens inward in the longitudinal direction of the diaper and a pocket that opens inward in the width direction of the diaper. Therefore, it is not necessary to attach the end sheets to the front and rear waist regions as in the prior art diaper to form the pocket. Since the pocket that opens inward in the longitudinal direction of the diaper is recessed below the diaper, the pocket does not close even when the wearer's buttocks press the pocket from above to below. A step is formed between the first region and the third region, and the first region located above the diaper with respect to the third region is in close contact with the wearer's skin. Can be prevented from occurring, and leakage of excrement can be prevented from leaking.

[Brief description of the drawings]

FIG. 1 is a partially broken perspective view of a disposable diaper.

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is a plan view of the diaper in FIG.

FIG. 4 is a sectional view taken along line BB of FIG. 3;

[Explanation of symbols]

 Reference Signs List 1 laminated panel 2 liquid-permeable top sheet 3 liquid-impermeable back sheet 4 liquid-absorbent core 4a side edge 4b end edge 5 side flap 6 leak-proof cuff 6c longitudinal both ends 8 elastic member 9 elastic member 20 front waist area 21 Inseam area 22 Rear waist area 23 First area 24 Second area 25 Third area L1 dimension L2 dimension P1 pocket P2 pocket

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Rumiko Shiraishi 1531-7 Wadahama Takasuka, Toyohama-cho, Mitoyo-gun, Kagawa Prefecture F-term in Unicharm Corporation Technical Center 3B029 BD12 BD13 BD14 BF07 4C098 AA09 CC02 CC10 CC14

Claims (5)

[Claims] 1. A laminated panel comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and a liquid-absorbent core interposed between the sheets, wherein the panel is composed of a front waist region, a rear waist region, and a rear waist region. A waist region, a crotch region located between the front and rear waist regions, a pair of side flaps located outside both side edges of the core and extending in the longitudinal direction, and the longitudinal direction near both side edges of the core. In a disposable diaper comprising a pair of leak-proof cuffs extending upward and having a propensity to stand up above the panel due to elastic elasticity, at least one of the front and rear waist regions includes an edge from the core. A first region extending in the width direction at a predetermined distance outward in the longitudinal direction and a second region extending in the width direction between an edge of the core and the first region are defined; The rigidity of the two regions is the first region and the rigidity. A lower portion of the cuff is located in the front and rear waist region so that the first region can be drawn toward the third region by contraction of the cuff. The diaper, wherein a direction end is fixed on at least the first region of the first region and the second region. 2. The rigidity of the first to third regions is equal to the first,
3 region> the second region, and the rigidity value measured by the Gurley method is 0.05 to
0.5 mg range, 0.1-2.0 mg in the first region
, In the range of 0.01 to 0.2 mg in the second region, the tension required to extend the cuff section cut from the diaper to 93.3% of the total longitudinal length of the section. The diaper according to claim 1, wherein the force is in the range of 20 to 300 gf. 3. The size of the first region in the longitudinal direction is 1
The range of 0-70 mm, and the said dimension of the said longitudinal direction of the said 2nd area are the range of 5-70 mm.
The diaper described. 4. The diaper according to claim 1, wherein a longitudinal end of the cuff is fixed to the inside of the panel in a state of being laid down. 5. The top sheet according to claim 1, wherein the first region is made of an elastically stretchable sheet, such as a polyurethane foam, a synthetic rubber foam, a polystyrene foam, or an elastically stretchable urethane film. The diaper according to any one of claims 1 to 4, wherein the diaper is fixed in an extended state between the diaper and the back sheet.