JPH06204A - Disposable diaper and its manufacture - Google Patents

Abstract

PURPOSE:To provide a disposable diaper presenting fine appearance even after being interiorly packed and establish a method for manufacturing such a diaper with which the processing easiness for the interior pack is enhanced. CONSTITUTION:A disposal diaper comprises a front surface sheet 2 with liquid transmissivity, a rear sheet 3 with no liquid transmissivity, and an absorbent interposed between them. In the central part in longitudinal direction of a disper spread 1b in which a recess for leg opening 12 is formed on each side about the central part, the belly side part 22 and the back side part 20 are overlapped and folded so that the edge 17a of the part 22 is positioned identical to the edge 18a of the part 20, and the end side edge 17b and end side edge 18b are folded outward and overlapped in the middle between the first folding 15 and the mentioned edge 17a and in the middle between the folding and the edge 18a, and the end side edge 17b and the end side edge 18b of the back side part 20 are sealed together.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disposable diaper, particularly a disposable diaper used for infants, adults or incontinent persons, and more specifically, a pants-type diaper having a waist opening and a pair of leg openings. The present invention relates to a disposable diaper and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, various proposals regarding disposable diapers have been made. So far, disposable diapers have been so-called flat type diapers, which use tape fasteners to apply the diaper to the wearer, but in recent years, they have been formed into a brief type in advance, so-called "pants-type disposable diapers". Various techniques have been proposed.

A pants-type disposable diaper of this kind is formed with a pair of elastic leg openings and waist openings, and by wearing the pants,
It is designed to fit the wearer's body shape. Such a pants-type disposable diaper is characterized in that it can be worn in an upright position and can be raised and lowered by the wearer himself.In addition to the conventional function of a disposable diaper, the infant's "diaper separation" can be improved. It is said to be useful for toilet training to promote, or for incontinence, etc. or for walkable adults.

Several proposals have been made for the continuous production method of such pants-type disposable diapers, but they are basically disclosed in Japanese Patent Laid-Open Nos. 57-77304 and 1-292102. As described above, a "cross flow" method in which the longitudinal direction of the absorbent body is perpendicular to the flow direction of the web, and the longitudinal direction of the absorbent body seen in Japanese Patent Laid-Open No. 2-4364, etc. It is represented by the "vertical flow" method. In the production of these pants-type disposable diapers, the end side edge portions of the abdominal portion and the back side portion of the web are sealed and made into a product, and the product is accumulated and then packed as an interior pack.

[0005]

However, in the above-mentioned conventional method for manufacturing a disposable diaper, the folded disposable diaper is not always compact when the products are accumulated through the steps and packed in the inner pack. Since the shape of the inner pack was not so good, it was difficult to handle the product during the inner pack, so that the workability of the inner pack was lowered and the appearance of the inner pack was impaired. Further, as in the conventional case, if the disposable diaper is simply folded into four folds or the like, it is difficult to fold the diaper when wearing the diaper, and such a fold crease causes a bad wearing feeling.

Therefore, an object of the present invention is to provide a disposable diaper which improves the workability of an inner pack and has a good appearance and a comfortable fit even after the inner pack and a method for manufacturing the same.

[0007]

According to the present invention, a waist opening and a pair of leg openings are formed and are folded so as to have a W-shape by one first fold and two second folds as a whole. A pants-type disposable diaper, wherein the first fold is formed in the center of the crotch between the pair of leg openings by folding so that the abdominal side and the back side overlap. The second fold connects the edge of the ventral side and the edge of the dorsal side so that the edge of the ventral side overlaps with the edge of the dorsal side. By folding toward the outside, they are respectively formed in the intermediate portion between the first fold and the edge portion of the ventral side portion and the intermediate portion between the first fold and the edge portion of the back side portion. By providing a disposable diaper characterized by It is those that have achieved the above objects.

Furthermore, the present invention is a method for manufacturing the disposable diaper according to claim 1, wherein (a) a liquid-permeable top sheet, a liquid-impermeable back sheet, and a space between these sheets. A diaper deploying body forming step of forming a diaper deploying body in which concave portions for leg openings are formed on both sides of a central portion in the longitudinal direction, and (b) the longitudinal direction of the diaper deploying body. A first folding step in which the ventral side portion and the dorsal side portion are overlapped and folded so that the ventral side edge portion and the dorsal side edge portion coincide with each other in the central portion of ) The first formed by the first folding step
At the intermediate portion between the fold and the end edge portion of the ventral side portion and at the intermediate portion between the first fold and the end edge portion of the back side portion, the end side edge portion of the ventral side portion and the end of the back side portion, respectively. A second folding step in which side edges are respectively folded outward and overlapped, and (d) an end that seals the overlapped end side edge portion of the belly side portion and the end side edge portion of the back side portion A method of manufacturing a disposable diaper, which comprises a sealing step, and achieves the above object.

[0009]

According to the disposable diaper of the present invention, when the disposable diaper is folded, the waistline portion between the waist opening and the leg opening forms a bag shape. Parts are stored. Therefore, the product itself of the disposable diaper is folded into a bag shape to have a compact shape, and the folded shape is difficult to collapse, so that it is easy to operate even when directly packing the interior, and the productivity is improved and The appearance is also good.

Further, according to the method for manufacturing a disposable diaper of claim 2, since the diaper is end-sealed after being folded in the second folding step, it is compared with the case where the end-sealing is performed after the first folding. As a result, the contraction stress of the elastic member at each portion such as the waist opening and the leg opening is relieved, so that the workability of the end seal is improved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings. 1 is a perspective view showing a use state of a disposable diaper according to an embodiment of the present invention, FIG. 2 is a perspective view showing a state in which a disposable diaper according to an embodiment of the present invention is folded, and FIG. 3 is a perspective view of the present invention. FIG. 3 is a perspective view showing a manufacturing state of the disposable diaper according to the embodiment of FIG.

The disposable diaper 1a according to the embodiment of the present invention is shown in the state of use as shown in FIG.
As shown in FIG. 1, one waist opening 11 and a pair of leg openings 12, 12 are formed, and a liquid-permeable topsheet 2 and a liquid-impermeable backsheet 3 arranged on the skin side. , And the absorber 4 arranged between these sheets. Adjacent to the waist opening 11 and the pair of leg openings 12 and 12, elastic members 13, 14 and 14 are arranged in an expandable and contractible state, respectively, whereby the waist opening 11 and the pair of leg openings 12 are arranged. 1
Each of 2 and 2 is made elastic.

The disposable diaper 1 in a used state
The seal margins 8, 8 for joining the dorsal side portion 20 and the abdominal side portion 22 to a are provided on both sides of the disposable diaper 1a.
It is provided so as to project inside the waist opening 11.

2 and 3, the disposable diaper 1 according to the embodiment of the present invention in the folded state will be described. The disposable diaper 1 in the folded state has one first fold 15 and two second folds as a whole.
The folding lines 16 and 16 are folded so as to have a W-shape.

The first fold line 15 is formed by the diaper deploying body 1b.
The ventral side portion 22 and the back side portion 20 are folded so as to be overlapped with each other, so that the crotch central portion 21 between the pair of leg openings 12 is formed.

The second fold 16 has an end edge 17a of the abdomen 22 so that the end edge 17b of the abdomen 22 and the end edge 18b of the back 20 overlap each other. And the end edge portion 18a of the back side portion 22 are respectively folded outward, so that an intermediate portion between the first fold line 15 and the end edge portion 17a of the abdominal side portion 22 and the first fold line 15 and the above It is formed in each of the intermediate portions of the back side portion 22 and the edge portion 18a. Further, in this embodiment, in the folded state shown in FIG. 2, the topsheet 2 is on the outer side and the seal margin 8 is also on the outer side.

Next, an embodiment of the method for manufacturing the above-mentioned disposable diaper 1 will be described with reference to FIG. A method for manufacturing a disposable diaper according to an embodiment of the present invention includes a diaper development body forming step (a) for forming a diaper development body 1b, a first folding step (b), a second folding step (c), and an end sealing step. And (d). Each step will be described below.

(A) Diaper deploying body forming step In the diaper deploying body forming step, as shown in FIG. 3 (a), the diaper deploying body is manufactured by substantially the same process as the conventional one. The body 1b is composed of a liquid-permeable top sheet 2, a liquid-impermeable back sheet 3, and an absorbent body 4 arranged between these sheets, and has legs on both sides of the central portion in the longitudinal direction. A recess for the openings 12, 12 is formed.

(B) First Folding Step In the first folding step, as shown in FIG. 3 (b), individual diaper deploying bodies 1b (or a continuous product web).
With the surface sheet 2 on the upper side, the first fold 15 in the center of the crotch part 21 is aligned with the end edge portion 18a of the back side portion 20 and the end edge portion 17a of the belly side portion 22 so that the belly side is aligned. The part 22 and the back part 20 are overlapped and folded.

(C) Second Folding Step In the second folding step, as shown in FIGS. 3 (c) and 3 (d), the first fold line 15 formed by the first folding step and the ventral side portion are formed. At the intermediate portion with the end edge portion 17a and the intermediate portion between the first fold line 15 and the end edge portion 18a at the back side portion, respectively, with reference to the second fold lines 16, 16, the end side edge portion at the ventral side portion is formed. 17b and the end side edge portion 18b of the back side portion are folded outward so as to coincide with each other, and are overlapped. In this state, the lengthwise cross section of the folded portion forms a W shape. In this state, the topsheet 2 forms the outer surface.

In the first folding step and the second folding step described above, even if the diaper deploying body 1b is already individually cut as shown in the drawing, it is not individually cut continuously. There is no problem even if it is in the opened state. In the case where the continuous diaper development body 1b is folded, the diaper development body 1b must be a so-called "cross flow" method.

(D) End sealing step After the second folding step, as shown in FIG. 3 (d),
End side edge 17b of the ventral side and end side edge 18b of the back side
Since and form the sealing margin 8, the portion of the sealing margin 8 is sealed. Thereby, as shown in FIG. 2, the disposable diaper in which the topsheet 2 is located on the outer surface and is folded is obtained.

As the sealing means of the end seal, known methods such as heat fusion, ultrasonic wave, pressure bonding, adhesive, and sewing are used. The sealing margins 8 and 8 are located inside the disposable diaper in the use state of the disposable diaper 1 shown in FIG. By thus extending the sealing margins 8 and 8 inwardly, the appearance of the disposable diaper 1 is not impaired, and when the sealing portion is torn and removed from the wearer, it is easy to follow the sealing margins 8 and 8. Can be torn. That is, in general, in a pants-type disposable diaper, the strength of the sealing margin may be extremely low, and in such a case, the sealing margins 8 and 8 extend outward, as shown in FIG. In addition, the re-separation that tears the seal margin progresses from the seal margin 8 to a portion where the strength is reduced, and then it disengages from the seal margin 8 and progresses to the ventral side 22 or the back side 20 and cannot be easily peeled off. There was a problem.

After the end seal is completed, the folded disposable diapers are collected and packaged. Since the folded state is compact and its shape is maintained, the packaging is easy and after packaging. The appearance is also good.

Next, the material and the like of each component of the disposable diaper according to this embodiment will be described. Elastic members 13, 1
The material of Nos. 4 and 14 is not particularly limited as long as it has elastic elasticity such as thread rubber, flat rubber, ribbon-shaped elastic body, and water-absorption shrinkage fiber.

The absorber 4 is preferably formed in the shape of an hourglass in which the crotch portion is constricted, which makes it easy to apply it to the crotch and is excellent in wearing. As the absorbent body 4, the main material is defibrated pulp,
A polymer water absorbent is preferably used in combination, and a mixture of cellulose fibers, a thermoplastic resin and a polymer water absorbent which is heat treated is preferable. The polymer water absorber may be located in any of the upper layer, the middle layer and the lower layer, and may be mixed with the pulp. The polymer water absorber has a property of absorbing and holding 20 times or more of its own weight of liquid,
Those having a property of gelling are preferable, and as such a polymer water-absorbing material, a starch-acrylic acid (salt) graft copolymer, a saponified product of starch-acrylonitrile copolymer, a crosslinked product of sodium carboxymethyl cellulose, and acrylic Acid (salt) polymers and the like are preferable.

As the surface sheet 2, the excrement absorbent body 4 is used.
It is preferable that the liquid permeable sheet that is permeated to have a feel close to that of underwear, and as such a liquid permeable sheet,
In addition to woven fabrics and non-woven fabrics, porous films and the like which have recently begun to come into the limelight are preferred. In addition, water repellency can be obtained by applying a hydrophobic compound such as a silicone oil or paraffin wax to the peripheral edge of the surface sheet 2, or by applying a hydrophilic compound such as an alkyl phosphate and cleaning the peripheral edge with warm water. It is preferable to apply a treatment to prevent bleeding of urine and the like in the peripheral portion.

The back sheet 3 is made by adding a filler to a thermoplastic resin and stretched, and has a vapor-permeable, liquid-impermeable sheet having vapor permeability, or a sheet having a feeling close to that of underwear, for example, a composite of a film and a nonwoven fabric. Material or the like is used.

Next, the use of the disposable diaper of this embodiment will be described. During use, that is, when the disposable diaper is worn, the leg openings 14 and 14 are located on the arrow F side. Therefore, from the direction of the arrow F, the wearer's toes can be directly put on the folded disposable diaper and the edge portion 17a can be used. , 18
Pull up a. At the time of pulling up, the outer surface sheet is folded back inward, and the sealing margins 8, 8 are positioned inward. Thus, when worn, the toes are first placed in the leg openings 14, 14 when worn.
Since it can be easily worn by simply putting it in and pulling it up by holding the waist opening 11, it can be easily worn by an infant or the like who has a lot of movement.

The present invention is not limited to the above-mentioned embodiments, but can be variously modified without departing from the gist of the present invention. For example, the sealing margin is not limited to extend inward, and may extend outward.

[0031]

According to the disposable diaper and the method for producing the same of the present invention, the workability of the inner pack can be improved, and the appearance after the inner pack is good and the wearing feeling is good. Also,
According to the disposable diaper and the method for manufacturing the same of the present invention, the interior pack becomes compact.

[Brief description of drawings]

FIG. 1 is a perspective view showing a usage state of a disposable diaper according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a state in which a disposable diaper according to an embodiment of the present invention is folded.

FIG. 3 is a perspective view showing a manufacturing process of a disposable diaper according to an embodiment of the present invention.

FIG. 4 is a perspective view showing a broken state when a seal margin extends outward.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disposable diaper 2 Top sheet 3 Back sheet 4 Absorber 8 Sealing margin 11 Waist opening 12 Leg opening 15 First fold 16 Second fold 20 Dorsal 21 Crotch 22 Ventral

Claims (3)

[Claims] 1. A waist opening and a pair of leg openings are formed, and one first fold and two second folds are formed as a whole.
A pants-type disposable diaper folded so as to have a W-shape by folds, wherein the first fold is folded so that the abdominal side and the dorsal side overlap with each other, thereby forming the pair of leg openings. The second fold is formed in the center part of the crotch between the edges of the abdomen so that the edge of the abdomen and the edge of the dorsal are overlapped. Section and the end edge portion of the back side portion are respectively folded outward, so that an intermediate portion between the first fold and the end edge portion of the abdominal side portion and the end of the first fold and the back side portion A disposable diaper characterized in that it is formed in each of the middle part with the edge part. 2. The method of manufacturing the disposable diaper according to claim 1, comprising: (a) a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body arranged between these sheets. With and
A diaper deploying body forming step of forming a diaper deploying body in which concave portions for leg openings are formed on both sides of a central portion in the longitudinal direction, and (b) in the central portion in the longitudinal direction of the diaper deploying body,
A first folding step of stacking and folding the abdominal side and the dorsal side so that the edge of the abdominal side and the edge of the dorsal side coincide with each other; (c) the first folding At the intermediate portion between the first fold formed by the process and the edge portion of the ventral side portion and the intermediate portion between the first fold and the edge portion of the back side portion, the edge side edge of the ventral side portion Second folding step of folding and overlapping the outer side portion and the end side edge portion of the back side portion, respectively, and (d) overlapping the end side edge portion of the abdominal side portion and the end side of the back side portion An end-sealing step of sealing an edge portion, and a method for manufacturing a disposable diaper, comprising: 3. The method for producing a disposable diaper according to claim 2, wherein in the first folding step, the abdominal side surface sheet and the dorsal side surface sheet are combined with each other.