JPS5966503A - Disposable diaper - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a disposable diaper for treating excrement.

Conventionally, various types of disposable diapers that do not require a diaper cover have been proposed and put into practical use.

Generally, these known diapers include a water-permeable top sheet,
An elastic member attached in the length direction of the side flap formed by the water-impermeable backsheet, the absorbent core interposed between the two sheets, and the two sheets extending outward from both axial edges of the core. The waist part of the rear region is provided with a tape fastener for fastening the waist parts of the front and rear regions when worn. Generally, such diapers have a narrow inseam area, but in manufacturing the diaper, a top sheet and a back sheet having a width equal to the entire width of the waist are used, and the inseam area is narrow. A portion of the side flap was cut away to create a curved cut shape. However, cutting off part of the top sheet and back sheet in order to narrow the inseam area not only results in a large loss of material, but also causes the side flaps to have a curved shape. In order to achieve this, the precision of the cutter is required, and even a small amount of wear reduces the sharpness of the cutter, making it necessary to replace it within a short period of time. Therefore, manufactured diapers have to be expensive, which is one of the reasons why diapers cannot be popularized, even though they have the advantage of being extremely easy to use and hygienic.

An object of the present invention is to provide a disposable diaper that can eliminate the above-mentioned drawbacks and also improve its suitability to the body when worn, especially its suitability to the crotch.

To achieve the above object, the gist of the present invention is to provide at least a water-permeable top sheet, a water-impermeable back sheet, an absorbent core interposed between the two sheets,
A rectangular disposable diaper comprising elastic members attached near both ends in the width direction of the core so as to be elastic in the length direction thereof, extending outward from both ends in the width direction of one waist portion of the diaper. Tightening strips are attached to the vicinity of both ends of the diaper, and both sides of the crotch area of the diaper are folded over the core so that the folded portions are more secure than other portions that are not folded over. The first core member has a narrow width, and the second core member has a rectangular shape and is superimposed on the upper surface of the first core member.

Further, the present invention will be explained based on the illustrated embodiments,
It is as follows.

The diaper 1 has a front region 2, a rear region 3, and an inseam region 4.
The fasteners provided at both ends of the waist part 5 of the rear region 3 are assembled and worn by adhering the strips 7 to the vicinity of both ends of the waist part 6 of the front region 2. There is.

Furthermore, the diaper 1 includes a water-permeable top sheet 8, an impermeable back sheet 9, an absorbent core 10 interposed between the two sheets, and both sheet portions extending from both widthwise edges of the core. It consists of a formed side flap part 11 and an expandable member 12 attached to both side flap parts so as to be expandable and contractible in the length direction.

The absorbent core 10 includes a first core member 13 and a second core member 14. The first core member 13 is mainly made of a flap valve, and both sides 15 of the crotch area 4 are folded inward so that the front part of the crotch area 4 is narrowest and gradually widens towards the rear part. At the same time, the front portions of both side portions 15, 15 are stacked one on top of the other. A V-shaped gap 16 is formed between the opposing inner ends of the folded side parts 15, 15, which gradually widens from the front part of the crotch area 4 to the rear part thereof. The second core member 14 is mainly made of a flap valve, and is a vertical rectangle wider than the folded crotch area 4 and approximately the same width as the non-folded waist portions 5 and 6 of the first core member 13. The first core member 14 is formed on the upper surface of the first core member 14 .

Although not shown, at least the upper and lower surfaces of the first core member 13 and the second core member 14 are covered with tissue paper, as in conventionally known diapers of this type, or with No. 57-77302
No. 57-77303, and No. 57-82502, the hydrophobic net-like sheet disclosed in each application is covered as necessary.

The water-permeable top sheet 8 and the water-impermeable back sheet 9 are:
They have a rectangular shape and are generally made from non-woven fabric or plastic film, respectively. The absorbent core 10 is fixed between these sheets 8 and 9 with an adhesive, and each portion of the sheets 8 and 9 extending from the outer peripheral edge of the core is joined together with an adhesive. There is.

One end of a tightening strip 7 is attached to a side end of the waist portion 5 of the rear region 3. The strip 7 consists of a sheet portion 17 and an adhesive tape portion 18. The sheet portion 17 is made of a substantially non-stretchable material, such as one or more sheets of plastic film, non-woven fabric,
Made from woven fabrics, paper, etc. alone or in combination, and elastic materials such as woven fabrics, polyurethane foams, and polyethylene that have elasticity woven into them by weaving rubber threads or a woven structure of fibers. It may be made from a stretchable foam sheet such as foam, but the latter is preferred.

One end of the sheet portion 17 is connected to the back sheet 9.
is glued to. This bonding may be done using any adhesive, welding agent, etc., but depending on the material of the sheet portion 17, it is preferable to use ultrasonic welding. The adhesive tape portion 18 is made of the same material that is conventionally used in disposable diapers, and one end thereof is adhered to the lower surface of the sheet portion 17.

The adhesive can be protected when the adhesive tape portion 18 is not in use by applying a release agent directly to the top surface of the sheet-like portion 17 or by attaching the release tape to the inside of the adhesive tape portion 18. The adhesive tape part 18 is extended and a release tape is temporarily attached to the adhesive surface of the adhesive tape part 18.

The expandable member 12 has a cross-sectional diameter of 0.03 mm as shown in the illustrated example.
Made from multiple pieces of rubber material with a diameter of 2 to 0.6 mm2,
They are attached in the longitudinal direction within the side flap portions with an adhesive in a state in which they are stretched in the longitudinal direction at appropriate intervals or in contact with each other. The shape, arrangement, and attachment method of the telescopic member 12 are disclosed in detail in Japanese Patent Application No. 1983-61946 filed by the present applicant, and should be incorporated into the description of the present invention as necessary. Such an elastic member 12 has advantages such as not causing pressure marks or pain around the wearer's legs, and is preferable as an elastic member for this type of diaper. This does not exclude or prohibit the use of a single relatively wide tape-shaped foam sheet or a relatively narrow rubber tape that has conventionally been generally used in diapers of this type.

In the present invention having the above and configuration, the top sheet and 8
, the pack sheet 9 has a narrow inseam area by cutting off both sides of the inseam area like a conventional diaper, and protruding ears for fastening the waist area with an adhesive tape. Unlike things,
Since it is sufficient to simply cut the diaper into a rectangular shape and replace it with the ears by attaching the tightening strip 7, the high cost of conventional diapers can be suppressed and the diaper can be supplied at a low price. can.

Further, in the front part of the crotch area 4, which is most easily deformed by the wearer's crotch when wearing the diaper and is the first to receive urine, the first core member 13 in that part is formed to be the narrowest and thickest. Therefore, it fits perfectly to the wearer's body, has less deformation, and has good absorbency. In addition, in the rear part of the crotch area 4 where the employee's buttocks touch,
Since the first core member 13 at that part is formed to be the widest and to have a smaller level difference when overlapped with the second core member 15 than the front part, when the wearer is sleeping on his back. There is no foreign body sensation.

Therefore, according to the present invention, the intended purpose can be fully achieved and it is extremely useful for practical use.

[Brief explanation of the drawing]

FIG. 1 is a developed plan view of the diaper of the present invention with a portion cut away as seen from the top sheet side, and FIG. 2 is a developed plan view shown in FIGS.
3 is a sectional view taken along line III-III in FIG. 1. 1... Diaper 4... Inseam area 5, 6.
...Waist part 7...Tightening strip 8...Top sheet 9...Back sheet 10...Core 13...First core member 14...Second core member 15...Folding Overlapping both sides 17... Sheet-like part 18... Adhesive tape partial procedural amendment (method) Patent Office Commissioner Seki 14 Wa Daiden 1, Indication of the case 1982 Patent Application No. 173703υ 2, Title of the invention Disposable mortuary 3. Relationship with the intelligence of the person making the amendment Applicant's address Name (first name) Unicharm Co., Ltd. 4, Agent 8, Contents of amendment In the "Explanation" section, "The second is the first
``Figure ■-■ line sectional view,'' [Figure 2 is Figure 1 n
-m5 sectional view,” amended to 013

Claims (7)

[Claims] (1) At least a water-permeable top sheet, a water-impermeable back sheet, and an absorbent core interposed between the two sheets,
In a rectangular disposable diaper comprising stretchable members attached near both widthwise ends of the core so as to be stretchable in the length direction thereof, extending outward from both widthwise ends of one waist portion of the diaper. Tightening strips are attached near both ends of the diaper, and the core is folded over on both sides in the crotch area of the diaper, so that the folded portion is larger than other portions that are not folded over. The diaper characterized in that it consists of a narrow first core member and a rectangular second core member superimposed on the upper surface of the first core member. (2) The tightening strip consists of a sheet part attached to the back sheet near both widthwise ends of one waist part of the diaper, and an adhesive tape part attached to the side edges of the sheet part. A disposable diaper according to claim 1. (3) The disposable diaper according to claim 2, wherein the sheet portion of the tightening band is made of an elastic material. (4) For tightening, one end of the sheet portion of the strip is glued to the back sheet, and the adhesive tape portion of the strip is
3. The disposable diaper according to claim 2, wherein one end of the diaper is adhered to a side edge of the sheet portion. (5) The first core member has both sides of the crotch area folded inward so that the front part of the crotch area is narrowest and the width gradually becomes wider toward the rear part thereof, and the second core member 2. The disposable diaper according to claim 1, wherein the diaper has a width wider than the narrowest folded portion of the first core member and is overlapped with the first core member. (6) The disposable diaper according to claim 5, wherein the first core member has front portions of both sides of the crotch area stacked one on top of the other. (7) The cross-sectional area of each elastic member is 0.03 mm2 to 0.
．． The disposable diaper according to claim 1, which is made of a plurality of rubber materials having a diameter of 6 mm2.