Disposable diaper

Details Disposable diaper Disposable diaper

1995-11-22

1998-03-03

Weiss, John G.

Surgery

Means and methods for collecting body fluids or waste material

Absorbent pad for external or internal application and...

604386, 604389, A61F 1315

Patent

active

057229694

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

This invention relates to a disposable diaper. More particularly, it relates to a disposable diaper having no target tape on which a fastening tape is to be adhered during the use of the diaper and having a back sheet whose softness is enhanced, and being free from the problems that the fastening tape is detached or the back sheet is broken during the use.


BACKGROUND ART

Disposable diapers, which have heretofore been commercially available, are designed such that when the diaper is used, a fastening tape for securing the diaper to the user's body may directly be adhered to a back sheet. However, such disposable diapers have the problems that i) the back sheet is broken during the use of the diaper, ii) the fastening tape once adhered is often detached during the use of the diaper, and/or iii) the softness of the back sheet is low. Therefore, most of the disposable diapers, which are commercially available at present, are provided with a target tape on which the fastening tape is to be adhered. The primary object of the target tape is to prevent the back sheet from being broken when the fastening tape once adhered is detached from the back sheet.
In the diapers provided with the target tapes, the fastening tape is required to be adhered to the target tape. However, when the mother puts the diaper on the baby, she happens to adhere the fastening tape directly to the back sheet by mistake. This is likely to cause the back sheet to be broken. Further, limitation is imposed on the adjustment in the waist size of the diaper because adhesion of the fastening tape is limited only onto the target tape.
Therefore, recently, several types of disposable diapers having no target tape have been proposed.
In these disposable diapers, prevention of breakage of the back sheet is intended by reducing the peel strength of the fastening tape or increasing the mechanical strength of the back sheet. However, if the peel strength of the fastening tape is reduced, the problems will be raised that the fastening tape once adhered is detached while the wearer moves although the breakage of the back sheet can be prevented. If the mechanical strength of the back sheet is increased, the back sheet provides an unpleasant stiff feeling. Such problems restricts the user of the disposable diapers of this type to those who move rather calmly, such as adults and few-month-old babies.
Further, in order to solve the above problems, some technological thoughts have been proposed as to the disposable diapers having no target tape.
For example, Japanese Patent Application Laid-open 5-287244 discloses a tape system for use as a fastening tape for diapers, wherein the retention time, the shear strength and the peel strength of an adhesive agent layer of the type are specified. Japanese Patent Application Laid-opens 55-93802 and 56-9402 disclose disposable diapers having a reinforced back sheet and no target tape.
However, the above-mentioned Japanese Patent Application Laid-open 5-287244 indicates nothing about a back sheet. The tape system disclosed fails to exhibit its inherent performance sufficiently when used in combination with a conventional back sheet. Further, the diaper disclosed therein fails to enhance the softness and the comfortableness of the back sheet. Disposable diapers disclosed in the above-mentioned Japanese Patent Application Laid-opens 55-93802 and 56-9402 have a reinforced back sheet.
However, the diapers fail to exhibit their inherent performance so far as no limitation is imposed on the strength of the back sheet or the peel strength of the fastening tape because the reinforcement is effected by the adhesive agents such as hot melt.


DISCLOSURE OF THE INVENTION

Therefore, an object of the present invention is to provide a disposable diaper having no target tape, thereby preventing breakage of the back sheet or detachment of the fastening tape even when the diaper is subjected to the vigorous motion of the wearer, and enhancing flexibility of the back sheet and comfortableness during the use of the dia

REFERENCES:
patent: 4210144 (1980-07-01), Sarge, III et al.
patent: 4296750 (1981-10-01), Woon et al.
patent: 5260360 (1993-11-01), Mrozinski et al.
patent: 5352513 (1994-10-01), Mrozinski et al.
"Derwent Publications Ltd." Week 8948, Apr. 19, 1988, Database WPI & JP,A,01 266 150--Oct. 24, 1989.

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