Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1997-09-29
1999-11-16
Aftergut, Jeff H.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156229, 156494, 26 52, B32B 3108, B29C 5316, D06C 302
Patent
active
059850701
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method and a device for stretching a web of material in the manufacture of a liquid-absorbent article. The article comprises an absorption body and a cover enclosing the same and is made by said web of material which is fed in its longitudinal direction and to which elongated elastic elements are fastened. These extend at an angle to the longitudinal direction of the web and thereby exert forces on the web. The forces are directed transversely to the longitudinal direction of the web. The web of material is kept stretched in its longitudinal direction as well as in its transverse direction by mechanical restraint of the web of material adjacent to its longitudinal edge portions. The restraint is achieved by pressing restraining members against the web of material until the web is penetrated. After the penetration, the restraining members are held in positions where they occupy holes in the web and provide support surfaces directed substantially transversely to the plane of the web. The surfaces engage portions of the web at the respective holes formed during the penetration. The stretching of the web of material is maintained during the fastening of said elastic elements.
BACKGROUND ART
From EP-A1-0 510 715 it is known as prior art to manufacture liquid-absorbent articles consisting of an absorption body and a cover, where the cover is manufactured from continuously fed webs of material. The article is formed as a diaper, an incontinence-protection, training pants or the like, in which elastics around the legs are achieved by placing and fastening elongated elastic members on one of the webs of material, wherein said elastic members have been given a continuously sinusoidal extension over the longitudinal direction of the web of material. By the extension of the elastic members and their fastening to the web of the material, said web is affected by forces pointing in different directions, i. a. transversely to the longitudinal direction of the web of material. The forces exerted on the web of material in its longitudinal direction by the elastic members are counteracted by stretching the web of material by means of feeder-rollers during the manufacture of the article. In order to counteract the forces exerted on the web of material transversely to its longitudinal direction it is known to apply a vacuum against the web of material. This however presupposes that the web of material is air-tight or only permeable to a limited degree. Thus, this method is not applicable for stretching a web of liquid-permeable material which is used as one side of the article.
U.S. Pat. No. 2,434,111 discloses a method and an apparatus of manufacturing elastic fabrics using pins as restraint means carried by chains forming part of a transportation device. As the fabric connects with the pins directly at a roll, the restraining effect in the longitudinal direction will not be fully performed with the risk that the elastic fabric will not be restrained to a smooth surface at the moment when elastic elements are fastened.
SUMMARY OF THE INVENTION
The object of the present invention is to eliminate the aforementioned inconveniences in the manufacture of absorbent articles of the aforementioned type so that the web of material is kept well stretched in every direction.
Said object is achieved by a method and a device according to the present invention restraining members extend in a continuous loop and substantially linearly over an engagement-portion of the loop. The web of material is fed over a portion linearly toward said engagement-portion at an acute, small angle to the web of material.
By the method and device according to the invention, the contracting action of the elastic members is counteracted transversely to as well as along the longitudinal direction of the web of material.
DESCRIPTION OF THE DRAWINGS
The invention will be described in greater detail below by means of an embodiment and with reference to the accompanying drawings, in which
FIG. 1 diagrammati
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Aftergut Jeff H.
Mitchell Shawn A.
Scahygiene Product AB
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