Method of manufacturing disposable underpants by applying annular adhesive zones to the backsheet and top sheet for retaining elastic for leg holes

Abstract

Here is disclosed a method for manufacturing individual disposable underpants provided around a waist line and a pair of leg-holes with elastic members from two continuous webs and a plurality of continuous elastic members, characterized by that the webs are applied on predetermined locations with adhesive so that the elastic members can be reliably held on the webs although the elastic members must be forcibly curved when the elastic members are bonded between the webs with use of adhesive.

Description

BACKGROUND OF THE INVENTIONThe present invention generally relates to disposable underpants and, more particularly, to a method for manufacturing such diapers in the form of underpants and infant training shorts.Various approaches to such underpants or shorts have already been well known from, for example, Japanese Patent Application Disclosure Gazettes Nos. 1982-77304 and 1982-117602. These Gazettes disclose the methods for attachment of the elastic members to the waist-hole and the leg-holes of the underpants, particularly along the curves of the respective leg-holes so as to improve a fitness around the wearer's legs.In order to ensure that a continuous elastic member can be continuously attached to web at locations to be formed into the waist-hole and the leg-holes, respectively, during continuous manufacturing basic bodies of underpants from said web, it is generally required that such continuous elastic member must be kept stretched at a predetermined ratio when it is attached...

AI Technical Summary

Benefits of technology

According to the present invention, as has been described hereinabove, there are provided the annular adhesive zones defined by strips of adhesive having a width larger than that of the continuous elastic members intermittently along the length of said web and the continuous elastic members for the leg-holes are attached to the web along these annular adhesive zones. With a consequence, the continuous elastic members can be safely and reliably held on the continuous web without significant displacement or shift of the continuous elastic members from the associated annular adhesive zones even if the continuous web is of fib

Problems solved by technology

Such undesirable deviation or shift of the elastic member may occur also in the above-referred prior art because, according to such prior art, the elastic member carrying adhesive previously applied thereon must be attached to fibrous nonwoven fabric having its surface usually less smooth than that of plastic film and an

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