JPH04364845A - Disposable diaper - Google Patents

Abstract

PURPOSE:To achieve excellence in leakage preventability of discharge and property of following a wearing person as basic performance of absorbing product. CONSTITUTION:This disposable diaper is provided with the body which has a liquid permeable top sheet 2, a non liquid impermeable back sheet 3 and an absorbent 4 disposed between both the sheets. Both side rims 6a, 6b, 7a and 7b of a belly side part 6 positioned on the side of the belly of a wearing person and a back side part 7 positioned on the side of the back are joined securely together respectively to form a waist opening, a pair of leg openings and a shell surrounding part. In a pant type disposable diaper in which a gathering is formed at an opening surrounding part A of the waist opening, open surrounding parts C of the pair of leg openings and at least at a part in the circumferential direction of the shell surrounding part B separately, expansion stresses are different in the surrounding direction of the waist opening surrounding part A, the leg open surrounding parts C and the shell surrounding part B separately.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to disposable diapers for infants, adults, and incontinent persons, and more particularly to so-called pants-type diapers.

0002

[Prior Art] In general, pants-type diapers are
As disclosed in Japanese Patent Publication No. 207605, the main body includes a vertically elongated main body consisting of a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body interposed between these two sheets. is divided into a ventral part located on the ventral side of the wearer and a dorsal part located on the back side of the wearer. A pair of left and right side flaps formed on both sides along the longitudinal direction of the main body connect and fix the ventral side and dorsal side to each other to form a pair of left and right leg openings and one waist opening. .

[0003] This type of pants-type diaper has a pair of leg openings and a waist opening that are stretchable to fit the wearer's body shape, and usually allows the wearer to stand up. Because they can be worn in the same position, they are used for toilet training to encourage infants to "wean off diapers," or for incontinent or ambulatory adults.

[0004] Pants-type diapers, compared to so-called flat-type diapers, are characterized by the fact that they are easy for the wearer to put on and take off by themselves, just like regular underwear, and also easy for caregivers to put on. In order to prevent the person from leaking excrement and to make it easy to wear,
Pants-type disposable diapers are required to have excellent fit. Furthermore, it is required to have sufficient followability even for the active activities of the wearer.

[0005]

[Problems to be Solved by the Invention] However, in conventional pants-type diapers, when elastic members (elastic members) are uniformly arranged from the waist opening area to the leg opening area, the wearer's body The shape is not uniform and has a roughly drum-shaped concave shape between the crotch and waist, so it fits around the waist opening and leg openings, but it does not fit around the wearer's torso. has the disadvantage of not being able to fit properly.

[0006] If the diaper does not fit the wearer securely, there are problems such as leakage of excrement from the gap between the wearer and the diaper, lack of ability to follow the wearer's activities, and the diaper slipping down. On the other hand, if the stretching force of the elastic member from the area around the waist opening to the area around the leg openings were made uniformly strong in accordance with the areas where fitting is most difficult, the wearer would feel unnecessarily compressed. However, there is a problem in that the feeling of wearing is significantly inferior.

[0007] Accordingly, an object of the present invention is to provide a pants-type disposable diaper that is excellent in leak-proofing properties of absorbent articles for excrement and in its ability to follow the wearer.

[0008]

[Means for Solving the Problems] The present invention includes a main body having a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body disposed between these two sheets, Both side edges of the ventral part located on the ventral side and the dorsal part located on the dorsal side are joined and fixed to form a waist opening, a pair of leg openings, and a waist circumference, and the waist opening is In the pants-type disposable diaper, gathers are formed around the openings of each of the waist openings, the pair of leg openings, and at least a part of the circumferential direction of the waist opening. The above object has been achieved by providing a disposable diaper characterized by having different elastic stresses in the circumferential direction around the waist.

[0009]

[Function] According to the pants-type disposable diaper according to the present invention, the elastic stress is different in each part of the waist opening area, the pair of leg opening areas, and the torso area, and elastic stress is applied to each area. Therefore, it can fit individually to each body part according to the wearer's body shape, and can effectively prevent leakage and slipping down without putting pressure on the wearer.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred first embodiment of the present invention will now be described in detail with reference to FIGS. 1 to 3 of the accompanying drawings. As shown in FIGS. 1 and 2 in the unfolded state, the pants-type diaper 1 includes a liquid-permeable top sheet 2, a liquid-impermeable back sheet 3, and an absorbent body disposed between these two sheets. 4, and the main body 5 is divided into a ventral part 6 located on the ventral side of the wearer when worn, and a dorsal part 7 located on the back side of the wearer. The side edges 6a, 6b, 7a, 7b of the back side part 7 are joined and fixed to form the pants shape shown in FIG. 3, and a waist opening peripheral part A and a pair of leg opening peripheral parts C are formed. It has become so. Furthermore, a waist opening area B is formed between the waist opening area A and the pair of leg opening areas C. The waist opening surrounding area A and each leg opening surrounding area C include,
Expandable members 11a, 11 are placed at a certain distance from the absorbent body 4.
b, 12a, 12b are stretched, and waist gathers 13 and leg gathers 14a, 14b are formed. In addition, elastic members 17a, 17b are provided around the waist area B, similar to the waist opening area A and the leg opening area C.
are stretched to form waist circumference gathers, and one end of the elastic members 17a, 17b rests on the absorbent body, and the other end extends to both side edges 6a, 6b, 7a, 7b.

[0011] The top sheet 2 absorbs excrement into the absorbent body 4.
It is preferable to use a liquid-permeable sheet that has a feel similar to that of underwear; such liquid-permeable sheets include:
For example, woven fabrics, nonwoven fabrics, porous films, etc. are preferred. In addition, a method of applying a hydrophobic compound such as a silicone oil or paraffin wax to the peripheral edge of the top sheet 2, or a method of applying a hydrophilic compound such as an alkyl phosphate ester in advance and washing the peripheral edge with warm water can be used to make the top sheet 2 repellent. After water treatment,
It is possible to prevent leakage due to oozing of urine or the like in the peripheral portion.

The back sheet 3 is made of a liquid-impermeable and vapor-permeable sheet that is made by adding a filler to a thermoplastic resin and stretching it, and has a feel similar to that of underwear, such as film and non-woven fabric. or a composite material of a film and a woven fabric. Absorber 4
is preferably formed into an hourglass shape constricted approximately at the center, and the length L1 in the longitudinal direction is preferably 300 mm.
mm to 600 mm, approximately 400 mm in this example, and the width L2 of the constricted portion is preferably 80 mm to 110 mm.
In this embodiment, it is formed to be approximately 90 mm. The width L3 of the absorbent body 4 on the ventral side and the dorsal side is preferably 120 mm to 350 mm (approximately 160 mm in this embodiment), and the width L4 of the side flap extending from the absorbent body 4 is preferably 10 mm.
〜150mm In this example, approximately 100mm, both side edges L
5 is preferably 5 mm to 30 mm, and in this example, approximately 1
It is 0 mm.

[0013] The material of the absorbent body 4 is preferably a material mainly composed of defibrated pulp and a combination of a high-molecular water-absorbing polymer, and also a heat-treated mixture of thermoplastic resin, cellulose fiber, or a high-molecular water-absorbing polymer. is preferred. The water-absorbing polymer may be present in any of the upper layer, middle layer, and lower layer, and may be mixed with the pulp. The high-molecular water-absorbing polymer has the ability to absorb and retain liquid at least 20 times its own weight, and is preferably in the form of particles that have the property of gelling. Saponified products of (salt) graft copolymers, crosslinked products of sodium carboxymethylcellulose, acrylic acid (salt) polymers, and the like are preferred.

In the main body 5, a pair of waist flaps 15a, 15b are provided on both longitudinal edges of the absorbent body 4, and a pair of waist flaps 15a and 15b extend outward from these edges, and a pair of waist flaps 15a and 15b extend outward in the width direction from both side edges of the absorbent body 4. A pair of left and right side flaps 16, 16 are provided. Each waist flap 15a, 15b
Each has the above-mentioned elastic member 1 around the waist opening area A.
1a and 11b are stretched, and elastic members 12a and 12b of the leg opening peripheral portion C are stretched on the left and right pair of side flaps 16 and 16, respectively.

Furthermore, an elastic member 17a is provided in the waist area B located between the waist opening area A and the leg opening area C.
, 17b are stretched. Then, the side flaps 16a and 16b on the dorsal side and the ventral side are partially joined and fixed at both side edges, respectively, and as shown in FIG. B.

[0016] The waist flaps 15a, 15b and the side flaps 16, 16 are the top sheet 2, respectively.
The overlapping portion of the back sheet 3 and the back sheet 3 are integrally formed in the main body 5. Elastic members 11a, 11b, 12 stretched around the waist opening area A and the leg opening area C
a, 12b has an expansion/contraction rate of 200% or more, natural rubber,
It is continuously joined to the top sheet 2 and the back sheet 3 as a plurality of thread-like bodies or a band-like body made of synthetic rubber, foamed polyurethane, or the like.

Therefore, the elastic members 11a and 11b of the waist opening periphery A are arranged continuously along the periphery of the waist opening periphery A to form the waist gathers 13. On the other hand, the elastic member 12a around the leg opening,
12b will form leg gathers 14a, 14b when the leg opening peripheral portion C is formed. Also,
The elastic members 17a and 17b around the waist are also constructed in the same manner as the elastic members 11a, 11b, 12a, and 12b of the waist opening surrounding area A and the leg opening surrounding area C, respectively, and the gathers 17 are formed around the waist area B. The waist circumference B is designed to fit around the wearer's waist.

[0018] Elastic member 11a around the waist opening area A;
11b, and elastic members 12a, 12 around the leg opening C.
b, and the elastic members 17a and 17b around the waist have elastic stress [per width of 5 mm and length (length in the elastic direction) of 10 mm] when stretched by 20%, 50%, and 100%, respectively. (same below) is 10g to 120g, 20g to 150g, 3
It is preferable to use a material that exhibits a stress of 0 g to 300 g, and a material that exhibits a stretching stress of about 60 g, 140 g, and 220 g when the stretchable member of this example is stretched by 20%, 50%, and 100%, respectively.

Note that the waist opening circumference A, the torso circumference B, and the leg opening circumference C shown in FIGS. 2 and 3 correspond to the waist a, lumbar bone b, It is provided corresponding to the area near the base of the crotch (c). The circumference of the leg opening circumference C passes over the wearer's groin area and is therefore greatly influenced by the wearer's activities and posture. That is, the body shape of an infant generally has a cylindrical shape (approximately a drum shape) in which the hipbone part b is narrower than the waist part a and the crotch part c, and therefore the wearer's normal circumference is , waist opening circumference A > leg opening circumference C > torso circumference B; posture;
The maximum amount of change (ΔA, ΔB, ΔC) in waist opening circumference A, torso circumference B, and leg opening circumference C due to activity is △
A>ΔC>ΔB. At the same time, the stress applied to each of the above-mentioned parts of the disposable diaper has the following relationship: waist opening periphery A>leg opening periphery C>waist periphery B.

[0020] Depending on posture, activity, and wearing, the circumference of each part of the disposable diaper of the present invention may increase by up to 20%,
It changes by 50% and 100%, but at that time, as the elastic property, each elastic stress is 10g around the waist opening A.
~120g, preferably 10-120g, leg opening periphery C 20g-150g, preferably 20-150g
, waist circumference B is 30g to 300g, preferably 30g to
If it is 200g, the wearer will not feel pressure, and it will be easy to wear, and there will be no gaps around the waist opening (A) and leg opening (C), providing excellent slip-off and leakage prevention performance. able to demonstrate.

When the disposable diaper of this embodiment described above is worn, the joints 6a, 6 are separated from the unfolded state shown in FIG.
b, 7a, and 7b are overlapped and joined together to form a pants shape as shown in FIG. 3. In this pants-like state, the wearer's legs are passed through the waist opening area A and then through the leg opening area C and pulled up to be worn. When worn, the waist opening surrounding area A is located at the wearer's waist area a, the torso surrounding area B is located near the wearer's lumbar region b, the leg opening surrounding area C is located near the crotch c, and the waist opening surrounding area is located at the wearer's waist area b. Waist gathers 13, leg gathers 14a and 14b, and waist gathers 17 are formed in A, a pair of leg opening surrounding areas C, and a waist surrounding area B, respectively.

In this case, each gather 13, 14a, 14
Items b and 17 apply elastic stress to the corresponding circumference of the body to suit the fit depending on the characteristics when worn, so the wearer does not feel pressure. There is no. In addition, it has elastic properties that match the posture and activities of infants, so there is no gap around the waist opening (A) and leg opening (C), providing excellent slip-off and leakage prevention performance. .

[0023] Also, the circumference of the waist opening circumference A is:
Generally, it is known that the circumference of the torso circumference B varies by up to about 5 cm depending on the wearer's posture, but since the circumference of the torso circumference B passes from above the hipbone to the buttocks, it is not affected much by the wearer's posture. Furthermore, in the first embodiment described above, no elastic elastic member is interposed between the gathers 14a, 14b of the leg opening circumference C and the gathers 17 of the waist circumference B.
That is, no other elastic member is arranged between the elastic members 12a, 12b of the leg opening peripheral area C and the elastic members 17a, 17b of the waist area B.

[0024] The width of the area where such an elastic member does not exist is 10 to 100 mm, preferably 10 to 70 mm, and in this way, the gathers 14a of the leg opening periphery C,
Since there are no gathers between the gathers 14b and the gathers 17 of the waist circumference B, there is no possibility that the stretchable member hinders the wearer's legs from working, and furthermore, there is no gathering between the gathers 17 of the waist circumference B and the leg opening circumference. C gathers 14a, 14
b acts independently without being influenced by others, so the elastic properties of the gathers 17, 14a, and 14b are not damaged. Therefore, the disposable diaper of the first embodiment can provide excellent fit.

Next, a second preferred embodiment of the present invention will be described. The second embodiment is configured such that the elastic stress of the dorsal side and the ventral side of the waist opening periphery A are different from that of the first embodiment described above, and in other respects, The structure is substantially the same as that of the first embodiment. That is, although the elastic stress of the elastic member 17b on the back side and the elastic member on the ventral side in the waist opening periphery A is set to be different, the elastic stress on the elastic member 17b on the back side
The degree of difference in the elastic stress of the elastic member 17a on the ventral side is:
It varies depending on the type of diaper, for example, for infants and adults, and it also differs for thin and obese types, so it cannot be specified in general, but for infants, it is better to set the stress on the back side higher. It is easy to fit and handle. This is because changes in abdominal girth due to posture are mainly caused by expansion and contraction of the ventral region, and in order to follow this, it is necessary to increase stress in the ventral region. On the other hand, it is easier for a caregiver to put on and take off the bedclothes if the stress on the ventral side is higher. Specifically, the ventral part 10
It is desirable that the stress of the gathers on the ventral side is set to be higher by ~140g, preferably 10~90g, than on the backside.

[0026] Also, the elastic member 1 around the waist opening area A
The respective stresses 7a and 17b are applied to the elastic member 11b on the back side and the elastic member 1 on the ventral side in the waist opening periphery A.
The maximum stress at 20% elongation (per width 5 mm, length 10 mm) of 1a is 10 to 120 g, preferably 10 to 60 g, and the stress at 50% elongation (per width 5 mm, length 1
0 mm) maximum value of 20 to 150 g, preferably 20 to 100 g, and stress at 100% elongation (width 5
mm, per length 10mm) maximum value is 30~
200 g, preferably in the range of 30 to 150 g is used.

According to the pants-type disposable diaper according to the second embodiment, in the area around the waist opening,
The elastic stress is different on the ventral and dorsal sides, and the elastic stress is applied depending on each part, so it fits each part of the body according to the wearer's body shape or activity level, without putting pressure on the wearer. Leakage and slippage can be effectively prevented.

[0028] Furthermore, when the disposable diaper according to the second embodiment is used as an adult diaper, even when the wearer is bedridden, the elastic stress on the abdominal part is higher than that on the dorsal part, making it easy to put on and take off. It's easy to do. The present invention is not limited to the one embodiment described above, and can be modified in various ways without departing from the gist of the present invention.

For example, around the waist B, there is an elastic member 17a.
, 17b are not limited to being disposed in one part, but may be disposed over the entire periphery as shown in a developed view in FIG. Further, the elastic member may be disposed partially or intermittently in the waist opening periphery A and the leg opening periphery C.

[0030]

EFFECTS OF THE INVENTION The disposable diaper of the present invention has excellent excrement leak-proofing properties and ability to follow the wearer, which are the basic properties of an absorbent article. Furthermore, even when worn by a caregiver, the elastic properties of the side portions are not uniform, making it easy to operate when worn.

[Brief explanation of drawings]

FIG. 1 is a developed view of a disposable diaper according to an embodiment of the present invention.

FIG. 2 is an enlarged plan view of approximately half of the disposable diaper shown in FIG. 1;

FIG. 3 is a perspective view showing the disposable diaper shown in FIG. 1 in a worn state.

FIG. 4 is a developed view of a disposable diaper according to another embodiment of the present invention.

FIG. 5 is a diagram showing locations corresponding to the wearer of the disposable diaper.

[Explanation of symbols]

1. Pants-type diaper 2 Top sheet 3 Back sheet 4 Absorber 5 Main body 6 Ventral part 7. Dorsal part 6a, 6b, 7a, 7b both side edges A: Around the waist opening B. Waist circumference C　Leg opening periphery

Claims (7)

[Claims] Claim 1: A ventral part located on the ventral side of the wearer, comprising a main body having a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body disposed between these two sheets. A waist opening, a pair of leg openings, and a torso circumference are formed by joining and fixing both side edges of each of the dorsal side portions located on the back side, and forming a waist opening, a pair of leg openings, and a waist circumference, respectively. In the pants-type disposable diaper, gathers are formed around the opening of the diaper and at least part of the circumferential direction of the waist opening. Disposable diapers characterized by different elastic stresses. 2. The stress at the time of 50% elongation of each part in the waist opening periphery, the torso periphery, and the leg opening periphery is such that the waist opening periphery > the leg opening periphery > the waist periphery. 2. The disposable diaper according to claim 1, wherein the disposable diaper has the following relationship. 3. The maximum values of stress (per width 5 mm and length 10 mm) at 20% elongation of each part of the waist opening periphery, the torso periphery, and the leg opening periphery are 10 to 120 g and 50%, respectively. The maximum stress during elongation (per width 5 mm and length 10 mm) is 20 to 150 g, respectively.
The disposable diaper according to claim 1 or 2, wherein the maximum stress (per width 5 mm and length 10 mm) at 100% elongation is 30 to 200 g. 4. The maximum stress (per width 5 mm and length 10 mm) of each part of the waist opening periphery, the torso periphery, and the leg opening periphery at 20% elongation is 10 to 60 g and 50%, respectively. Stress during elongation (width 5 mm, length 1
(per 0mm) maximum values of 20 to 100g and 1
Stress at 00% elongation (per width 5mm, length 10mm)
The disposable diaper according to claim 1 or 2, wherein the maximum value of is 30 to 150 g. 5. Gathers are formed in each of the leg opening periphery and the torso periphery, and in a region between the leg opening periphery gather and the waist circumference gather, The disposable diaper according to any one of claims 1 to 5, characterized in that there is no elastic stretchable member. 6. The disposable diaper according to claim 1, wherein the region where the elastic stretchable member does not exist is formed along the waist circumference with a width of 10 to 100 mm. 7. The disposable diaper according to claim 1, wherein the stress at 50% elongation of the dorsal side and the ventral side around the waist opening is different.