JPH04354948A - Disposable pants and its manufacture - Google Patents

Abstract

PURPOSE:To keep a discharge liquor from being retained at the opening of a waist while preventing leakage of the excrement at the opening of the waist. CONSTITUTION:A disposable pants are provided with a liquid permeating top sheet 2, a non-liquid permeating rear sheet 3 and a body 5 having an absorbent 4 arranged between both the sheets. The body 5 is divided into a belly side part 5A positioned on the side of the belly of a wearing person in wearing and a rear side part 5B position on the side of his back. In this disposable type pants which have respective both side rims of the belly side part and the rear side part joined securely to waist opening 13 and a pair of leg openings 14A and 14B, waist elastic members 8A and 8B are arranged adjacent to the waist opening 13 over the entire circumference of the opening 13 while elastic expandable cubic cuffs 20A and 20B are extended toward the crotch part from below the waist opening inside the waist opening.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to disposable pants used for infants, adults, or incontinent persons, and a method for manufacturing the same.

0002

2. Description of the Related Art In conventional disposable diapers, as disclosed in Japanese Patent Application Laid-Open No. 57-77304, the ventral and dorsal regions of a pair of left and right side flaps are joined and fixed to each other. 2. Description of the Related Art Disposable pants in the form of so-called pants have been proposed, each having a leg opening and a waist opening. The pants-type disposable pants (hereinafter referred to as "disposable pants") are configured such that the leg openings and the waist openings are each elastically formed to fit the wearer's body shape. Such disposable pants are usually made by the wearer himself.
It can be worn in a standing position and is used for toilet training to encourage infants to wean themselves from diapers.
It is also said to be useful for people who are incontinent or who are able to walk.

On the other hand, several proposals have been made regarding methods of manufacturing disposable pants. These are basically JP-A-57-77304 and JP-A-1-28210.
With respect to the longitudinal direction of the absorber as seen in Publication No. 2,
This is typified by the so-called "cross-flow" manufacturing method in which the flow direction of the web is vertical. Generally, the gathers in disposable pants are to allow the pants to follow the wearer's movements, and the gathers should be soft and fit to prevent leakage of excreta and to avoid injuring the wearer. Various methods have been proposed to prevent injury to the wearer, such as using a low modulus elastic member, providing multiple elastic members with a wide width, and placing cushioning material between the gathers and the skin. .

0004

[Problems to be Solved by the Invention] However, in the waist gathers of disposable pants, the elastic member stretched between the top sheet and the back sheet contracts, and the top sheet and the back sheet fold together. Although the waist gathers are arranged around the entire circumference of the waist opening, in rare cases, excrement may leak out of the pants through gaps in the folds of the top sheet. On the other hand, even if the excretory fluid does not leak out, if it is retained in the gaps between the folds of the top sheet, it may cause eczema or rash on the wearer.

[0005] In order to prevent such leakage of excrement, increasing the elongation rate of the gathers may cause injury to the wearer, and it is necessary to make the sheet thinner so as to reduce the gap between the folds. This has the disadvantage that it feels uncomfortable to the touch. Accordingly, an object of the present invention is to provide disposable pants that prevent leakage of excrement from the waist opening and do not retain excrement fluid in the waist opening, and a method for manufacturing the same.

[0006]

[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. When worn, it 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. In the pants-type disposable pants formed with an opening and a pair of leg openings, a waist elastic member is disposed adjacent to the waist opening over the entire circumference of the opening, and inside the waist opening. The above object has been achieved by providing disposable pants characterized in that elastic three-dimensional cuffs extend from below the waist elastic member toward the crotch area.

[0007] The present invention also provides a method for manufacturing disposable pants having elastic three-dimensional cuffs on the inner periphery of the waist opening, in which the longitudinal direction of the absorbent body is An absorber arrangement step of arranging the absorber perpendicular to the flow direction of the backsheet, and a waist elastic member arrangement step of arranging the waist elastic members symmetrically and continuously on both side edges along the flow direction of the backsheet. a superimposing step of overlapping the top sheet on the back sheet so as to cover the absorbent body; and a cuff forming step of forming a product web by continuously joining three-dimensional cuffs adjacent to the waist elastic member. and a cutting step of folding the web in two along the center line in the machine direction, sealing the web between the absorbent bodies, and cutting the web. , the above objectives have been achieved.

[0008]

[Operation] The three-dimensional cuffs are elastically contractible and are laid down toward the leg openings of the disposable pants. The three-dimensional cuffs are made of elastic around the inside of the waist opening, and fit effectively against the wearer's skin. Three-dimensional cuffs form a pocket between the body and the inside of the waist opening, and store excrement that floats inside the disposable pants without being absorbed by the absorbent body, while absorbing the part that can be absorbed by the absorbent body. By damming the unabsorbable portion, it is prevented from reaching the waist opening.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described in detail with reference to FIGS. 1 to 4 of the accompanying drawings. As shown in FIGS. 1 and 2, disposable pants 1 according to an embodiment of the present invention include 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 5A located on the ventral side of the wearer when worn, and a dorsal part 5B located on the dorsal side, and the ventral part 5A And in pants-type disposable pants in which both side edges of the back side portion 5B are joined and fixed to form a waist opening 13 and a pair of leg openings 14A, 14B, the waist opening 13 is adjacent to the waist opening 13. Elastic members 8A, 8
B are arranged around the entire circumference of the opening, and inside the waist opening 13, adjacent to the waist elastic members 8A and 8B, elastically stretchable three-dimensional cuffs 20A from below the waist elastic members, 20B extends toward the crotch area.

[0010] On both sides of the main body 5 in the width direction, leg portions 5C concave in an arc shape are formed. The main body 5 is divided into a ventral part 5A located on the ventral side of the wearer and a dorsal part 5B located on the dorsal side when worn.
B is formed approximately symmetrically with respect to a vertical center line 6 located approximately at the center of the main body 5. A pair of waist flaps 7A, 7 are provided on both longitudinal edges of the absorbent body 4 in the ventral side portion 5A and the dorsal side portion 5B of the main body 5, and extend outward therefrom.
B, and waist elastic members 8A and 8B that form gathers on each of the waist flaps 7A and 7B are arranged. A pair of left and right side flaps 9A, 9 on the ventral and dorsal sides extend outward in the width direction from both side edges of the absorbent body 4.
At B, side elastic members 10A and 10B are arranged to form gathers on each side flap 9A and 9B. In addition, the side flaps 9A and 9B of the leg portion are provided with leg elastic members 11A and 11B that form gathers in the leg openings 14A and 14B (see FIG. 2), and the side flaps 9A and 9B on the dorsal side and the ventral side are Both side edges 12B and 12A
The waist opening 13 and the pair of left and right leg openings 14 are partially joined and fixed, respectively.
A and 14B are formed.

The waist flaps 7A, 7B and the side flaps 9A, 9B are basically overlapping portions of the top sheet 2 and back sheet 3, respectively, and are integrally formed with the main body 5. Leg elastic members 11A and 11B arranged in a curved manner are stretched over the leg portion 5C, and are formed in an arc shape along the horseshoe shape of the leg portion 5C. In the part overlapped with the absorber 4,
It is desirable that both leg elastic members 11A and 11B are non-stretchable.

On the other hand, the waist elastic members 8A and 8B disposed on the waist flaps 7A and 7B are formed as a plurality of thread-like bodies disposed substantially parallel to each other along the edges of the waist flaps 7A and 7B, respectively, and attached to the top sheet 2. and the back sheet 3. Elastically contractible three-dimensional cuffs 20A, 20B are arranged adjacent to the waist elastic members 8A, 8B. When the waist opening 13 is thus formed, the waist elastic members 8A, 8B and the elastically contractible three-dimensional cuffs 20A, 20B are
are arranged continuously along the periphery of the waist opening 13.

As shown in detail in FIG. 3, the three-dimensional cuffs 20A and 20B have a fixed part 21 and a free part 22, and are generally composed of a sheet member 24 and a cuff elastic member 23, with the fixed part 21 being a top sheet. 2 or the back sheet 3, and the free portion 22 has a cuff elastic member 23 interposed at its end, thereby imparting elastic contractibility to the three-dimensional cuffs 20A, 20B. The sheet member 24 may be the top sheet 2 or the back sheet 3, and in this embodiment, a part of the back sheet 3 is used. Further, the sheet members 24 of the three-dimensional cuffs 20A, 20B may themselves have elastic contractibility. In this case, the cuff elastic member 23 can be omitted.

As shown in FIG. 3, the above-mentioned fixed portion 21 is a sheet member 24 constituting the three-dimensional cuffs 20A, 20B.
are bonded and fixed near the edge of the waist opening 13. The fixed part 21 is three-dimensional cufflinks 20A and 20B.
It has a fixed edge 25 that forms a boundary point with the free portion 22 at the bottom. Further, in diapers for elderly children or adults, since the length of the absorbent body in the longitudinal direction is large, a fixed edge 25 may be provided on the absorbent body. This fixed edge 25 is formed between the waist elastic members 8A, 8B and the absorbent body 4, and the fixed portion 21 is formed from the open end of the waist opening 13 to the fixed end. In addition, methods for joining and fixing the fixed part 21 include ultrasonic sealing, heat sealing,
Adhesives and other materials known in the industry can be used. In this embodiment, since the fixed portion 21 is formed on the upper surface of the waist gathers, the waist elastic members 8A, 8B
It is preferable to bond and fix the material so as not to impede its elastic properties.

A cuff elastic member 23 is interposed at the free end of the free portion 22 to provide elastic contractibility of the free portion 22. Free portion 22 is disposable pants 1
In the unfolded state, it extends from the fixed part 21 toward the leg openings 14A, 14B (crotch area) so as to be laid down on the main body 5. By doing so,
The free portion 22 is prevented from inverting when and during wearing of the disposable pants 1, and an inward pocket portion 26 is formed between the free portion 22 and the main body 5. This pocket part 2
6 temporarily accommodates and retains excrement that tends to run out without being absorbed by the absorbent body. The cuff elastic member 23 arranged at the free end fits the wearer flexibly. Also,
Preferably, the free portion 22 is provided with anti-inversion means. The inversion prevention means is, for example, by adhering the mating surfaces of the three-dimensional cuffs 20A, 20B and the main body 5 to the inside of the top sheet 2 using a hot melt adhesive or the like, so that the free portion 22 is turned outward. There are ways to prevent this.

The width of the fixed portion 21 (the dimension in its inward extending direction) is preferably 5 to 80 mm, and the fixed edge 25 is located between the waist elastic member 8B and the edge of the absorbent body 4. It is placed at a position 0 to 70 mm inside from. Further, the width of the free portion 22 is preferably 10 to 50 mm. The cuff elastic member 23 is preferably made of rubber thread, but may also be made of any material known in the industry, such as flat rubber, film-type rubber, stretchable non-woven fabric, or polyurethane foam. However, the arrangement of the ventral and dorsal elastic members is generally symmetrical. It is preferable that the stress at 150% elongation is 30 to 100 g. This is because if it is less than 30g, the elasticity will not be sufficient and the free part will not fit the wearer.
This is because if it exceeds 0g, the elasticity will be too strong and may hurt the wearer.

[0017] If stretchable non-woven fabric is used, the waist elastic members 8A, 8B can be omitted by constructing the free and fixed parts of the three-dimensional cuffs 20A, 20B with stretchable non-woven fabric. . Three-dimensional cufflinks 20A
, 20B is preferably a water-repellent, breathable sheet that is thin and has a good texture, preferably a non-woven fabric. From a manufacturing point of view, it is preferable to form the sheet member 24 using a part of the top sheet 2 or the back sheet 3, and in this embodiment, a part of the back sheet 3 is used.

The top sheet 2 is preferably a liquid-permeable sheet that allows excrement to pass through to the absorbent body 4 and has a feel similar to that of underwear. Such liquid-permeable sheets include, for example, woven fabric, There are nonwoven fabrics, porous films, etc. In addition, a silicone oil agent is applied to the peripheral edge of the top sheet 2.
Water repellent treatment is applied by applying a hydrophobic compound such as paraffin wax, or by applying a hydrophilic compound such as an alkyl phosphate ester in advance and washing the periphery with warm water. Leakage can be prevented.

The back sheet 3 may be made of a liquid-impermeable sheet that is made of a thermoplastic resin such as polyolefin with a filler added and stretched and that is permeable to vapor, or a sheet that has a feel similar to that of underwear, such as a film. A composite material with a non-woven fabric or a composite material with a film and a woven fabric is used. The absorbent material 4 is preferably made of defibrated pulp as a main material and also contains a high-molecular water-absorbing polymer, and is also made of thermoplastic resin,
Preferably, a mixture of cellulose fibers and high-molecular water-absorbing polymers is heat-treated, and what is generally referred to as a polymer sheet. The high-molecular water-absorbing polymer has a retention ability capable of absorbing and retaining liquid at least 20 times its own weight, and is preferably in the form of particles that have the property of gelling. Examples of such high-molecular water-absorbing polymer include starch. - Acrylic acid (salt) graft polymers, saponified starch-acrylonitrile copolymers, crosslinked sodium carboxymethyl cellulose, acrylic acid (salt) polymers, etc. are preferred.

[0020] Also, elastic members 8A, 8B, 10A, 10
As B, 11A, and 11B, any material known in the industry can be used, such as thread rubber, flat rubber, film-type rubber, stretchable nonwoven fabric, or foamed polyurethane, and even if it is one or more. good. In addition, the stress at 150% elongation of each elastic member is 30 to 10
It is preferable that the weight is 0 g, and it is more preferable to use a plurality of low-stress elastic members so as not to leave marks on the abdomen.

Next, a preferred embodiment for manufacturing disposable pants of the present invention will be described with reference to FIG. In the following forming steps, the forming steps of the side elastic members 10A, 10B and the leg elastic members 11A, 11B will be omitted in order to clarify the essence of the present invention. The web of the backsheet 3 is unwound by the unwinding device, while the absorbent web is cut into individual absorbent bodies 4 by the cutter 50 and disposed intermittently on the backsheet web 3. The long side of the absorber 4 is
The absorbent body is arranged perpendicularly to the flow direction of the web (absorbent body arrangement step).

Furthermore, the top sheet 2 having a width that can substantially cover the absorbent body 4 is fed out from above,
The back sheet 3 and the absorbent body 4 are superimposed on each other by the roll 51 to form a product web (superposition step). Next, the process moves to the formation process of three-dimensional cuffs 20A and 20B. In this embodiment, the three-dimensional cuffs 20A and 20B are formed by a part of the backsheet 3. That is, cuff elastic members 2 are attached to both end edges parallel to the flow direction of the main web.
3 is stretched, and both end edges of the back sheet 3 are folded in so as to wrap around the cuff elastic members 23 (cuff forming process).

In this embodiment, the cuff elastic member 23 is continuously stretched around the edge of the backsheet 3 to form the three-dimensional cuff 20.
A, 20B is formed, but without being limited to the above,
Three-dimensional cuffs 20A, 20 in which cuff elastic members 23 are arranged
A method may also be used in which a sheet piece in which B is formed separately is continuously joined and fixed to the back sheet 3. Next, in the waist gather formation step, waist elastic members 8A and 8B are arranged on both side edges in parallel to the web flow direction (waist elastic member arrangement step), and both side edges of the backsheet 3 are folded in again. . The cuff elastic members 23 and the waist elastic members 8A and 8B are thus arranged so as to be wrapped around the backsheet 3.

When all the materials have been assembled, leg openings 14 are punched out in a punching section 52. The punching in the process section 52 is performed using a rotary die cutter or the like. Then, in the folding process section 53, the main web is folded in half along the center line 51 in the flow direction, the web is side-sealed in the side-seal process section 54, and then cut into individual disposable pants (cut) in the cutting process section 55. process), and finally accumulate.

In this manner, disposable pants 1 according to an embodiment of the present invention are manufactured, and continuous three-dimensional cuffs 20A and 20B are formed on the disposable pants 1. According to this manufacturing method, it is possible to reduce the number of fabrics and processes for the three-dimensional cuffs 20A and 20B, which helps save space in the processing machine. Furthermore, according to the manufacturing method according to this embodiment, by utilizing the folding of the back web (top sheet or back sheet), it is possible to improve the placement accuracy of the three-dimensional cuffs and save space in the processing machine equipment.

It goes without saying that the embodiments of the disposable pants related to the present invention and the method of the present invention can be modified as desired without departing from the spirit of the present invention. For example, a tear guide means may be arranged adjacent to the side seal portion of the disposable pants 1 so that the wearer can easily tear the pants off. This tear guide means can be a cut guide line, a seal part, or something that can be easily torn, but it needs to have enough strength to prevent it from tearing or tearing while being worn. .

Further, in manufacturing the disposable pants according to the present invention, the three-dimensional cuffs may be formed separately from the web and joined to the web after the waist elastic member is arranged on the web. Note that the three-dimensional cuffs do not need to use cuff elastic members as long as the sheet member 24 itself has elasticity.

[0028]

[Effects of the Invention] According to the disposable pants of the present invention, leakage of excrement from the waist opening is prevented, and excrement fluid is not retained in the waist opening. According to the method for manufacturing disposable pants of the present invention, the above-mentioned disposable pants can be suitably manufactured.

Furthermore, according to the disposable pants of the present invention,
It is possible to eliminate leakage from the waist due to the formation of gaps due to gathering, and it is also possible to provide an inexpensive product with excellent flap texture. Furthermore, the three-dimensional cuffs can prevent excrement.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an unfolded state of disposable pants according to an embodiment of the present invention.

FIG. 2 is a perspective view showing the disposable pants shown in FIG. 1 in a natural state.

FIG. 3 is a cross-sectional view taken along line XX shown in FIG. 2;

FIG. 4 is a manufacturing process diagram of the disposable pants shown in FIG. 1.

[Explanation of symbols]

1 Disposable pants 2 Top sheet 3 Back sheet 4 Absorber 8A, 8B, waist elastic member 20A, 20B 3D cufflinks 23 Cuff elastic member

Claims (7)

[Claims] Claim 1: A main body comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body disposed between these two sheets, and the main body is attached to the wearer's ventral side when worn. A waist opening and a pair of leg openings are formed by joining and fixing the respective side edges of the ventral side part and the dorsal side part. In the pants-shaped disposable pants that formed the
A waist elastic member is disposed adjacent to the waist opening over the entire circumference of the opening, and inside the waist opening, elastic stretchable three-dimensional cuffs extend from below the waist elastic member toward the crotch area. Disposable pants characterized by extending. 2. The disposable pants according to claim 1, wherein the three-dimensional cuffs are provided with elastic stretchability by being stretched with an elastic member in the width direction. 3. The disposable pants according to claim 1, wherein the waist elastic member includes a plurality of linear elastic members. 4. The three-dimensional cuffs are formed by stretching an elastic member over a part of the backsheet and positioning the elastic member below the waist elastic member inside the waist opening. The disposable pants according to claim 2 or 3, characterized by: 5. The three-dimensional cuffs are formed by stretching an elastic member over a part of the top sheet and positioning the elastic member below the waist elastic member inside the waist opening. The disposable pants according to claim 2 or 3, characterized by: 6. Claims 1 to 5, wherein the three-dimensional cuffs are formed continuously over the entire circumference.
Disposable pants as described. 7. A method for manufacturing disposable pants having elastic three-dimensional cuffs on the inner periphery of the waist opening, the method comprising an absorber arrangement step of arranging the absorber so as to be perpendicular to the direction; a waist elastic member arrangement step of arranging the waist elastic members symmetrically and continuously on both side edges along the flow direction of the backsheet; a cuff forming step of forming a product web by continuously joining three-dimensional cuffs adjacent to the waist elastic member; A method for producing disposable pants, comprising the steps of: folding the web in half along the center line in the machine direction, sealing the web between the absorbent bodies, and cutting the web.