JPH0678952A - Disposal diaper and its manufacture - Google Patents

Abstract

PURPOSE:To simplify manufacturing process and reduce manufacturing cost by conducting, in a diaper having a pocket structure, the process for forming a pocket opening part by boring and the process for trimming a notched part for passing leg parts in the same process. CONSTITUTION:A hydrophobic surface sheet 8 is laminated on both sides of the outer surface of a liquid permeable surface sheet 1, and three sheets including a reverse sheet 2 are mutually bonded and fixed in both cross-directional end parts of a diaper. The three surface and reverse sheets 1, 2 are trimmed and cut together to form a notch part 7 for passing leg parts on cross directional both sides of a moisture absorptive core. Then, both side ends of the upper surface sheet 1 of the two-layer surface sheets are butted to each other in the cross directional center of the diaper and turned up to partly lap, and the notch part 7 is arranged in the center of the surface sheet 1 to form a pocket opening part 9. At the time of turning, a stretchable elastic body 11 is bonded in the stretchable state on the inside of the turned part followed by turning.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disposable diaper having a leakage resistance portion and a method for manufacturing the same.

[0002]

2. Description of the Related Art There have been various proposals for a structure for preventing leakage of urine and loose stools in disposable diapers, for example, Japanese Patent Publication No. 52-40267 and Japanese Patent Laid-Open No. 5267/1987.
No. 8-65002, JP-A-62-250201, JP-A-63-112703 and the like.

Japanese Examined Patent Publication No. 52-40267 discloses a top sheet and a back sheet in which elastic tapes made of natural rubber are stretched at the side flaps of the diaper at a position close to and parallel to the outside of both ends of the absorbent body. It is placed in between, and when used, the gathers are started up with the side flaps and elastic tape (generally called "leg gather") to form an effective seal around the infant's leg. Prevents crotch. JP-A-58-65002 describes
At the ends of the side flaps of the diaper, elastic members are raised in an expanded state to form elastically contractible weirs (generally referred to as “three-dimensional gathers”). We propose a technology to prevent it. Japanese Unexamined Patent Publication No. 62-250201 discloses a gasket cuff formed of an elastic member on a side flap portion of a diaper,
We have proposed a technology to prevent crotch with "double cuffs" with a barrier cuff three-dimensionally formed of an elastic member on the side of the gasket cuff near the absorber. JP 63-
No. 112703 is the first side flap part of the diaper.
It is divided into a flap and a second flap located on the upper surface,
A technique has been proposed in which an elastic member is arranged at the free end of the second flap portion to form a three-dimensional gather to prevent crotch leakage. Further, Japanese Patent Laid-Open No. 63-112703 proposes a technique for further improving the leakage prevention effect by making both or one of the first flap and the second flap waterproof.

However, the technology for preventing crotch with "three-dimensional gathers" and "double cuffs" is basically based on the fact that it is actually used.
9632, Jikkou 33-16215, Jikō 41-
It is a well-known technique disclosed in many publications relating to "diaper cover" such as No. 18031 and Japanese Utility Model Publication No. 41-18359, and these are merely applied to "disposable diapers". It is also widely known that various three-dimensional structures called "leg gathers", "three-dimensional gathers", "double cuffs", etc. are effective in preventing diaper leaks, and disposable diapers currently on the market. In most cases, one or more of the above-mentioned prior arts are applied. Among them, the “three-dimensional gather” is currently the best method to prevent crotch leak because it blocks the large amount of instantly excreted urine and loose stools until it is absorbed by the absorbent body of the diaper. ing. However, the above-mentioned three-dimensional structure shows a three-dimensional shape in which gathers are raised on both sides of the absorbent body in the product form before being worn on a human,
At the time of wearing, the three-dimensional structure tends to be flattened by being crushed, and it is difficult to completely prevent lateral leakage of urine and loose stool in the leg direction only by "three-dimensional gather" and "double cuffs".

In the conventional diaper described above, the urine absorbed in the absorbent body may return (wet back) to the topsheet and exude from the edge of the topsheet in the waist direction.
Further, since the hydrophilic surface sheet is slippery and in contact with the skin, the user feels damp and uncomfortable.

As a measure for reducing the reversion of urine and the discomfort during use, it has been proposed to dispose hydrophobic surface materials on both sides in the width direction of the diaper. Further, recently, there is a tendency to use a large amount of superabsorbent polymer for the purpose of thinning the absorber and improving the ability to absorb excrement. However, generally speaking, if the area of the absorbent body is small, even if a large amount of the superabsorbent polymer is used, the absorption capacity of excrement cannot be improved as expected. One of the reasons is that when the basis weight per unit area of the absorbent polymer between the pulp layers constituting the absorbent is increased, the gelled absorbent polymer is absorbed after excrement absorption at the second and third times. This is because a barrier layer that prevents the absorption of excrement is formed and the absorption rate of excrement is significantly inhibited. Further, if the absorbent body is flat, excrement easily flows laterally on the surface of the absorbent body, and side leakage cannot be prevented when the excretion amount is large.

In view of these problems of the conventional diapers, the present inventors have previously proposed that a hygroscopic core and both sides of the core are provided between the liquid-permeable top sheet and the liquid-impermeable back sheet. In the disposable diaper in which the stretchable elastic body is arranged in the stretched state, the hydrophobic surface sheet is arranged over the entire width of the outer surface of the liquid permeable surface sheet, and the outer side of the liquid permeable surface sheet and the hydrophobic A space (pocket) for accommodating urine or loose feces is formed between the both sheets by partially adhering and fixing the inside of the topsheet, and the excrement is dropped in the center of the hydrophobic topsheet. By providing a pocket opening for the urine, it is possible to prevent urine from returning to the topsheet (wetback), and to further prevent the urine from seeping out from the edge of the topsheet in the waist direction. The wet feeling of the user when in contact with the skin, has proposed a discomfort was further reduced invention (diaper having a pocket structure) (Japanese Patent Application No. 2-272341
issue).

[0008]

In the above prior invention, the pocket opening portion and the notch portion through which the leg portion of the infant when fitted is to be formed by cutting the sheet with separate punching cutters. Also in the manufacturing process, it is necessary to pre-drill the pocket opening before laminating the hydrophobic surface sheet on the liquid-permeable surface sheet.
After the surface sheets are stacked, they have to be performed in a separate process from the boring, which is a problem in that the manufacturing process becomes complicated.

[0009]

The present invention is an improvement of the method for forming a pocket in the above-mentioned prior invention. Particularly, in forming a pocket opening for dropping excrement, the central portion of the hydrophobic surface sheet is After completely changing the idea from the method of the prior invention of boring, after laminating the surface sheets on both sides in the width direction of the hygroscopic core so as to have at least two layers, and trimming the notches through which the legs pass, 2 above
Of the top sheet of the layer, both side edges of the top surface sheet are abutted at the center of the diaper in the width direction or folded back so as to partially wrap the top sheet so that the pocket opening for dropping the excrement is formed in the center of the top sheet. The part can be formed without boring.

That is, the diaper of the present invention is a disposable in which a hygroscopic core and stretch elastic bodies are arranged in an extended state on both sides of the core between a liquid-permeable top sheet and a liquid-impermeable back sheet. In the diaper, a hydrophobic surface sheet is laminated on both sides of the outer surface of the liquid-permeable surface sheet,
A notch for fixing the inner end in the longitudinal direction of the hydrophobic surface sheet to the lower surface sheet via an adhesive and passing leg portions on both sides in the width direction of the hygroscopic core in these surface sheet and back sheet. Of the two-layered surface sheet, both ends of the upper surface sheet are abutted at the center in the width direction of the diaper or folded back so as to partially wrap the diaper in the longitudinal direction. Part is fixed to the lower surface sheet via an adhesive, a pocket opening for dropping the excrement is formed in the central region of the diaper, and an elastic elastic body is also stretched inside the folding part. The gist is a disposable diaper that is characterized by being adhered and fixed.

Further, according to the present invention, a hygroscopic core and stretchable elastic bodies are disposed in an extended state between the liquid-permeable top sheet and the liquid-impermeable back sheet on both sides of the core. In the method for producing a diaper, a) a step of laminating the topsheets on both sides in the width direction of the hygroscopic core so as to form at least two layers, and b) the width of the hygroscopic core in the at least two-layer topsheet and backsheet. A step of trimming the notches through which the legs are passed on both sides in the direction, and c) abutting both ends of the upper surface sheet of the above surface sheets at the widthwise center of the diaper, or folding back so as to partially wrap A step of arranging a trimming cutout in the center of the surface sheet to form a pocket opening for dropping excrement without boring, d) the table When wrapping sheet, and presents a method for producing a disposable diaper according to subject matter in that it comprises the step of adhering to fix the stretchable elastic member to the inside of the folded portion in a stretched state.

[0012]

According to the present invention, there is provided a leakage resistance portion comprising both side portions (groin portion) in the width direction of the disposable diaper and both end portions in the longitudinal direction (front portion and back portion) of the hydrophobic diaper sheet and gathers standing upright in three dimensions. It is formed. According to the production method of the present invention,
The pocket opening and the notch through which the leg is passed can be formed by trimming and cutting at the same time with a punching cutter.

[0013]

Embodiments of the present invention will now be described with reference to the drawings. 1 is a plan view showing an embodiment of the diaper of the present invention, and FIG. 2 is a sectional view taken along the line AA of FIG. 1 and 2, reference numeral 1 is a liquid-permeable top sheet, and 2 is a liquid-impermeable back sheet. The front surface sheet 1 and the rear surface sheet 2 are formed to have dimensions substantially over the entire length and width of the diaper.
Are superposed on the back sheet 2 and are adhesively fixed so that they are aligned at their peripheral edges. The surface sheet 1 and the back sheet 2 are provided with a front part 5 which is located on the ventral side of the wearer when used and a back part 6 which is located on the back side of the wearer. A notch 7 is formed between the legs of the wearer. Also, in the center of the inside of both these sheets, along the longitudinal direction of the diaper,
A hygroscopic core 3 is arranged, and elastic elastic bodies 4 for forming gathers are arranged on both sides of the core in a stretched state along the longitudinal direction of the diaper. In the case of this embodiment, the hygroscopic core 3 is formed in an hourglass shape in plan view, but may be rectangular. Further, a plurality of elastic elastic bodies 4 for gathering are provided in parallel.

Hydrophobic surface sheets 8, 8 are laminated on both sides of the outer surface of the surface sheet 1. This hydrophobic surface sheet has its longitudinal inner end 8a fixed to the lower surface sheet 1 with an adhesive. As will be described later, the hydrophobic surface sheet 8 is folded back so that both side edges of the sheet are abutted or partially wrapped at the widthwise center of the diaper. Then, both ends in the longitudinal direction of the folded sheet are fixed to the lower surface sheet of the diaper with an adhesive at the back or front of the diaper, so that a pocket opening 9 for dropping excrement is provided in the central region of the diaper. Form. Incidentally, reference numeral 10 indicates a folding position. Further, the elastic elastic body 11 is adhered to the inside of the folded-back portion in a stretched state and folded back.

Referring to FIGS. 3A to 3C, the manufacturing process of the diaper of the present invention is briefly shown. In FIG. 3A, the hydrophobic surface sheets 8 are laminated on both sides of the outer surface of the liquid permeable surface sheet 1, and the back surface sheet 2
It is shown that the three sheets including the are bonded and fixed so as to be aligned at both widthwise ends of the diaper. In this state, as shown in FIG. 3B, in order to form the notch 7 through which the leg portion is passed on both sides in the width direction of the hygroscopic core, the three sheets of the two-layer top sheet and back sheet are put together. Trim and cut. Next, as shown in FIG. 3C, both side edges of the upper surface sheet of the two-layer surface sheet are abutted at the center of the diaper in the width direction or folded back so as to partially wrap the surface sheet, A trimming cut-out portion 7 is arranged in the center of the box, and a pocket opening 9 for dropping excrement is formed without boring. At the time of folding back, as described above, the elastic elastic body 11 is adhered to the inside of the folding portion in a stretched state and folded back.

The stretchable elastic body 11 thus bonded elastically contracts when the diaper is worn on an infant, and imparts a tensile force to the upper hydrophobic surface sheet 8, and as a result, the above-mentioned hydrophobic property is provided. Standing gather 12 on top sheet 8
Is formed. The height b of the standing gathers 12 is
When it is necessary to increase the height b of the upright gathers 12 in correspondence with the dimension from the bonding position of the inner end 8a in the longitudinal direction of the hydrophobic surface sheet to the folding position 10, the width of the hydrophobic surface sheet is changed. The width is widened so that the inner end 8a is bonded more inside (closer to the central portion).

4 (a) to 4 (c) show the manufacturing process of another embodiment of the diaper of the present invention. In this embodiment, the hydrophobic topsheets 8 and 8 are arranged so as to protrude outside the both side ends in the width direction of the liquid-permeable topsheet 1. Further, the folding position 10 of the hydrophobic topsheet is set to a position closer to the cutout portion 7 than in the above embodiment, and both side edges of the topsheet are folded back so as to partially wrap in the widthwise center of the diaper, A trimming cutout 7 is arranged in the center of the surface sheet to form a pocket opening 9 for dropping excrement. At the time of this folding back, as described above, the stretchable elastic body 11 is adhered to the inside of the folding back portion in the stretched state and folded back, as in the above-described embodiment. In addition, the diaper of the present embodiment configured in this way, as the height of the standing gather increases,
The exposed area of the liquid-permeable topsheet 1 is increased.

FIG. 5 shows another embodiment of the diaper of the present invention and corresponds to (a) of FIGS. 3 and 4. That is, in this example, when the hydrophobic surface sheets are attached to both sides of the outer surface of the liquid-permeable surface sheet 21, the hydrophobic surface sheets are configured in two layers (indicated by reference numerals 22 and 23). . The width of the liquid-permeable topsheet 1 is formed so that the hygroscopic core 3 can be covered and held inside. Although not shown in the drawings, of the two layers of the hydrophobic surface sheets 22 and 23, both side edges of the upper surface sheet 23 are abutted at the widthwise center of the diaper, or folded back so as to partially wrap the diaper and the above-mentioned embodiment or The adhesive fixing is performed as in the other embodiments. When turning back,
Adhesion of the stretchable elastic body 11 to the inside of the folded-back portion in the stretched state and folding back are the same as in the above-described embodiment. In addition, it is needless to say that the present invention can make various changes and modifications to the above-described embodiment, such as the use width of the hydrophobic sheet, the sticking position, and the folding position.

[0019]

As described above, according to the present invention, the hydrophobic surface sheet is laminated on both sides of the outer surface of the liquid-permeable surface sheet, and the inner end in the longitudinal direction of the hydrophobic surface sheet is located on the lower side. Of the top sheet of the two-layer top sheet of the above two-layer top sheet is formed by notching the top sheet and the back sheet by the leg portions on both sides in the width direction of the hygroscopic core in the top sheet and the back sheet. Both side edges of the topsheet are folded back so as to butt or partially wrap in the widthwise center of the diaper, and both longitudinal ends of the topsheet are fixed to the lower topsheet on the back or front of the diaper with an adhesive. Since a pocket opening for dropping the excrement is formed in the central region of the diaper and an elastic elastic body is adhered and fixed to the inside of the folded portion in a stretched state, both widthwise directions of the disposable diaper are Parts and (crotch portion), the leakage resistance portion comprising a gather sterically standing and hydrophobic surface sheet is formed in both longitudinal end portions (front portion and the back). As a result, due to the synergistic effect of the pocket opening in the central region of the diaper, the hydrophobic sheet on the outer periphery of the pocket, and the gathers standing upright in three dimensions, urine and loose stools dropped in the packet return to the surface sheet (wet back). It is also possible to prevent the liquid from squeezing out from the edge of the top sheet in the waist direction, and to reduce the user's feeling of dampness and discomfort when the liquid-permeable top sheet comes into contact with the skin.

Further, according to the manufacturing method of the present invention, since the pocket opening and the notch through which the leg is passed can be formed by trimming and cutting at the same time with the punching cutter, the manufacturing process is simplified and the conventional method is used. Since the diaper manufacturing equipment can be used as it is, there is an advantage that it can be manufactured at low cost.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a diaper of the present invention.

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

FIG. 3 is an explanatory view schematically showing the manufacturing process of the diaper.

FIG. 4 is an explanatory view showing a manufacturing process of another embodiment of the diaper of the present invention.

5 shows another embodiment of the diaper of the present invention, and FIG.
This corresponds to (a) in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid permeable top sheet 2 Liquid impermeable back sheet 3 Absorbent core 4 Expansion elastic body 5 Front part 6 Back surface 7 Cutout part 8 Hydrophobic surface sheet 8a Inner end 9 Pocket opening 10 Folding position 11 Expansion elastic body 12 Standing gather 22 Hydrophobic surface sheet 23 Hydrophobic surface sheet

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[Procedure amendment]

[Submission date] October 23, 1992

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Fig. 2]

[Figure 5]

[Figure 1]

[Figure 3]

[Figure 4]

Claims (3)

[Claims] 1. A disposable diaper in which a hygroscopic core and stretchable elastic bodies are arranged in an extended state on both sides of the core between a liquid-permeable top sheet and a liquid-impermeable back sheet, wherein: A hydrophobic surface sheet is laminated on both sides of the outer surface of the liquid-permeable surface sheet, and the inner end in the longitudinal direction of the hydrophobic surface sheet is fixed to the lower surface sheet via an adhesive, and these surfaces Form notches on both sides of the hygroscopic core of the sheet and the back sheet to pass through the legs, and butt or partially wrap both side edges of the top sheet of the top sheets at the widthwise center of the diaper. Both ends in the longitudinal direction of the folded back sheet are fixed to the lower surface sheet of the diaper with an adhesive at the back or front of the diaper, and a port for dropping the excrement is placed in the central region of the diaper. Disposable diaper, characterized in that Tsu preparative opening is formed, also to bond to secure the stretch elastic member inside the folded portion in a stretched state. 2. The disposable diaper according to claim 1, wherein the hydrophobic topsheet is composed of two layers. 3. A method of manufacturing a disposable diaper in which a hygroscopic core and stretchable elastic bodies on both sides of the core are stretched between a liquid-permeable top sheet and a liquid-impermeable back sheet. A) a step of laminating top sheets on both sides in the width direction of the hygroscopic core so as to form at least two layers, and b) on both sides in the width direction of the hygroscopic core in the at least two-layer top sheet and back sheet. A step of trimming a notch through which the legs pass, and c) abutting both side edges of the upper surface sheet of the above surface sheets at the widthwise center of the diaper, or by folding back so as to partially wrap the surface sheet, A step of arranging a trimming cutout in the center of the sheet to form a pocket opening for dropping excrement without hole punching; and d) folding at the time of folding back. Preparation of a disposable diaper, characterized in that it comprises a by unit steps the inner stretch elastic member adhered and fixed in an extended state of.