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US 5,861,074 AGranted
Method of making an elastic laminated sheet of an incrementally stretched nonwoven fibrous web and elastomeric film
AssigneeClopay Plastic Products Company, Inc.
InventorPai-Chuan Wu
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Abstract
An elastic laminated sheet of an incrementally stretched nonwoven fibrous web and elastomeric film and method of making are disclosed. The elastic laminates are especially useful in diapers, surgical gowns, sheets, dressings, hygienic products and the like.
Claims13
A method of making an elastic laminated sheet of a nonwoven fibrous web and an elastomeric film comprising
- introducing a nonwoven fibrous web and an elastomeric film into a bonding station,
- controlling the compressive force between said web and film at the bonding station to bond a surface of the web to said film to form a laminated sheet, said laminated film being elastic and having an original shape, said web being totally bonded to said laminated elastic film,
- applying an incremental stretching force to said laminated sheet along lines substantially uniformly and completely across the laminated sheet and throughout its depth to stretch the web and said film,
- removing said stretching force from the laminated sheet whereby said elastic film substantially recovers its shape and fibers of said web are thereby caused to extend outwardly from said bonded web surface to give loft to said laminated sheet, said laminated sheet being stretchable and recoverable without delamination of the web from the film, said laminated sheet having a permanent set after being stretched at 50% of its original shape of no more than about 10%.
1 more element
A method of making an elastic laminated sheet of a nonwoven fibrous web and an elastomeric film comprising
- introducing a nonwoven fibrous web and an elastomeric film into a nip of rollers,
- controlling the compressive force between said fibrous web and film at the nip to bond the surface of the web to said film to form a laminated sheet, said film being elastic and having an original shape, said web being totally bonded to said laminated elastic film,
- applying an incremental stretching force to said laminated sheet along lines substantially uniformly and completely across the laminated sheet and throughout its depth to stretch the web and the film,
- removing said stretching force from the laminated sheet whereby said elastic film substantially recovers its shape and fibers of said web are thereby caused to extend outwardly from said bonded web surface to give loft to said laminated sheet, said laminated sheet being stretchable and recoverable without delamination of the web from the film, said laminated sheet having a permanent set after being stretched at 50% of its original shape of no more than about 10%.
1 more element
Dependencies are inferred from the claim text.