JPS6315285Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement in a disposable diaper that does not require a diaper cover.

Generally, the basic structure of this type of diaper is a water-permeable top sheet made of nonwoven fabric, a water-impermeable back sheet made of synthetic resin film, and pulverized pulp interposed between the front and back sheets. It is made up of an absorbent material. In such a diaper, one end of a pressure-sensitive adhesive tape is attached to the back waist, and when the diaper is worn, the free ends of the pressure-sensitive adhesive tape are adhered to the back sheet at both ends of the front waist. As a result, both waists are joined together for assembly. However, as mentioned above, the material of the back sheet to which the free end of the pressure-sensitive adhesive tape is to be bonded is a synthetic resin film, which is generally extremely thin from the viewpoints of flexibility and economy. The adhesive on the free end of the pressure-sensitive adhesive tape is relatively strong so that the free end does not peel off when worn and the tightness around the waist does not loosen. . Therefore, in order to check whether the infant has urinated inside the diaper, or to retighten the diaper if it has become loose, the free end of the pressure-sensitive adhesive tape adhered to the back sheet of the diaper can be attached to the back sheet of the diaper. When it is peeled off from the sheet, the back sheet at the adhesion site is damaged, making it impossible to re-adhere the free end.

Conventionally, in order to eliminate this drawback, the outer surface of a reinforcing tape that has an adhesive surface on the inner surface is adhered to the adhesive surface of the free end of a pressure-sensitive adhesive tape, and when the pressure-sensitive adhesive tape is used for the first time, the reinforcing tape is removed. A device is known in which the process is carried out via the . However,
In the diaper of this known device, not only is the cost high, but the size of the reinforcing tape to be adhered to the free end of the pressure-sensitive adhesive tape is restricted, and furthermore, when the pressure-sensitive adhesive tape is used for the first time, The subsequent adhesion position for the back sheet will be specified. Therefore, unless the pressure-sensitive adhesive tape is used with great care for the first time, the reinforcing tape may be glued to the back sheet of the diaper in the wrong position, and if the reinforcing tape is installed incorrectly, It becomes ineffective. Also, if the back sheet of the diaper is stretched due to the first use of the pressure-sensitive adhesive tape, it is necessary to glue the free end of the pressure-sensitive adhesive tape to the position of the reinforcing tape that has already been glued. The desired position does not match, and the effect of providing the reinforcing tape is lost or reduced by half. Furthermore, when such a reinforcing tape is used, the appearance of the diaper when worn becomes poor.

On the other hand, by directly bonding the inner surface of the back sheet of the diaper and the upper surface of the absorbent body with adhesive at the part where the free end of the pressure-sensitive adhesive tape is to be bonded, and reinforcing that part, the free end can be re-attached. Ideas have been proposed to make bonding possible. However, in this known device, a material with relatively high tensile strength must be used for the upper surface of the absorber, resulting in high costs. By the way, pulverized pulp is generally used as the material for the absorbent material of diapers, and in some cases tissue paper is applied to the top surface of the pulp. It does not in any way reinforce the back sheet at the joint site.

On the other hand, in this type of diaper, when the diaper is worn and standing upright, the urine absorbed by the diaper does not leak out from the longitudinal ends of the diaper;
When lying down, that is, lying on one's back or head down, there was a problem in that the fluid leaked from the longitudinal ends, staining underwear and bedding. Such disadvantages are seen when relatively large amounts of urine are absorbed and this is diffused.

The purpose of the present invention is to provide a disposable diaper that can eliminate the above-mentioned drawbacks, and the gist of the present invention to achieve that purpose is to use a water-permeable top sheet and a water-impermeable back sheet. A diaper is constructed by interposing an absorbent body between the sheet and the diaper.
One end of the pressure-sensitive adhesive tape is attached to the back sheet at both ends of the back waist of the diaper, and the free end of the pressure-sensitive adhesive tape is attached to the back sheet of both ends of the front waist of the diaper. In the disposable diaper, the front waist and the back waist are each provided with a strip-shaped reinforcing waterproof sheet piece, and the reinforcing waterproof sheet piece is attached to the waist. The absorbent body is folded in the width direction to sandwich the longitudinal ends of the absorbent body, and one side edge of the folded line is placed between the top sheet and the absorbent body, and the other side edge is placed between the top sheet and the absorbent body. The bent end portions are interposed between the backsheet and the absorbent body, and the bent ends are interposed between the topsheet and the backsheet, and the front The diaper is characterized in that it is integrally joined to the back sheet.

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

As shown in FIGS. 1 and 2, the diaper 1 basically consists of a water-permeable top sheet 2 made of nonwoven fabric and an impermeable back sheet 3 made of ultra-thin synthetic resin film. , an absorbent body 4 whose main material is pulverized pulp and interposed between the front and back sheets, and has a front waist circumference 5 and a back waist circumference 6, and both sides of the dorsal waist circumference 6. One end 7a of the pressure-sensitive adhesive tape 7 is attached to the back sheet 3 at the end, and the adhesive surface, which is the inner surface of the free end 7b, is adhered to the top sheet 2 of the front waist 5, so that both waist circumferences 5, Diaper 1 is assembled by combining 6. Note that the outer peripheries of the topsheet 2 and backsheet 3 where they meet are bonded to each other using a hot melt adhesive (not shown) or the like, and these are placed between the topsheet 2 and backsheet 3 at both ends of the diaper 1. An elastic member 8 that expands and contracts in the vertical direction is attached.

As shown in FIGS. 1 to 3, a strip-shaped reinforcing waterproof sheet piece 8 is provided inside the front waist 5 and the back waist 6. The reinforcing waterproof sheet piece 9 is made of synthetic resin film, is bent in the width direction, and is positioned to sandwich the longitudinal ends of the absorbent body 4 and is joined to the top sheet 2 and the back sheet 3. It has been done. That is, the reinforced waterproof sheet piece 9
, one side edge 9a bordering on the folding line is between the topsheet 2 and the absorbent core 4, the other side edge 9b is between the backsheet 3 and the absorbent core 4, and the folded end The portions 9c are interposed between the topsheet 2 and the backsheet 3, and are integrally joined to the topsheet 2 and the backsheet 3 at the surfaces that contact the topsheet 2 and the backsheet 3, respectively. This bonding is made with a hot melt adhesive (not shown). In addition, it is preferable that the bonding with the back sheet 3 be performed by an adhesive applied in a planar shape or in a continuous line to the surface of the reinforced waterproof sheet piece 9 that comes into contact with the back sheet 3.

According to the diaper of the present invention constructed as described above, the pressure-sensitive adhesive tape is attached to the back waist 6 to which one end 7a is attached, and to the front waist 5 to which the free end 7b is to be bonded and peeled. This part of the backsheet 3 is reinforced by the one side end 9a of the reinforcing waterproof sheet piece 9, and the reinforcing waterproof sheet prevents urine absorbed into the absorbent body 4 from seeping out from the top sheet 2 around the front waist 5. This is prevented by the other end 9b of the piece 9. In particular, the reinforced waterproof sheet piece 9 is bent in the width direction, and the bent end 9c is interposed and joined between the top sheet 2 and the back sheet 3, so that the bent end becomes a bag shape. Urine leakage from the longitudinal ends of the diaper 1 is completely prevented.

Therefore, the diaper of the present invention can overcome the drawbacks of the conventional diapers mentioned above, and is extremely useful in practical use.

[Brief explanation of the drawing]

The drawings show an embodiment of the diaper of the present invention.
Figure 1 is a partially cutaway developed plan view, Figure 2 is Figure 1
3 is a sectional view taken along line Y--Y in FIG. 1, and FIG. 4 is a perspective view. DESCRIPTION OF SYMBOLS 1... Diaper, 2... Top sheet, 3... Back sheet, 4... Absorber, 7... Pressure sensitive adhesive tape, 9... Reinforced waterproof sheet piece, 9a... One side end, 9b... Other end, 9c...bent end.

Claims (1)

[Claims for Utility Model Registration] A diaper is constructed by interposing an absorbent body between a water-permeable top sheet and a water-impermeable back sheet, and the back sheet is attached to the back sheet at both ends of the back waist of the diaper. One end of the pressure-sensitive adhesive tape is attached, and the free ends of the pressure-sensitive adhesive tape are adhered to the back sheet at both ends of the front waist of the diaper, thereby joining the two waists. In the disposable diaper, the front waist and the back waist are provided with band-shaped reinforcing waterproof sheet pieces, and the reinforcing waterproof sheet pieces include:
It is folded in the width direction to sandwich the longitudinal ends of the absorbent body, and one side edge bordering the folding line is placed between the top sheet and the absorbent body, and the other side edge is placed between the top sheet and the absorbent body. between the back sheet and the absorbent body, and the bent end thereof is interposed between the top sheet and the back sheet, and the surface in contact with the top sheet and the back sheet is The diaper is characterized in that it is integrally joined with front and back sheets.