Laminated fibrous web comprising differentially bonded layers, a

Details Laminated fibrous web comprising differentially bonded layers, a Laminated fibrous web comprising differentially bonded layers, a

1985-10-07

1988-08-02

Bell, James J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

156209, 156219, 156220, 156290, 156553, 428172, 428218, 428284, 428287, 428296, 428297, 428298, 428913, B32B 2714

Patent

active

047613220

ABSTRACT:
A laminated fibrous web comprising: a first fibrous layer; and a second fibrous layer bonded to and of lower density than the first fibrous layer; wherein fibers in the second fibrous layer are less bonded to one another, than fibers in the first fibrous layer are bonded to one another; and wherein the first and second fibrous layers are less bonded to each other than fibers in the first fibrous layer are bonded to one another. Also disclosed are a method and apparatus for making such laminated fibrous webs, by the steps of forming a first fibrous layer of a first relatively higher density; bonding fibers of the first fibrous layer to one another at a first relatively higher extent of bonding; forming a second fibrous layer at a second relatively lower density; bonding fibers in the second fibrous layer to one another at a second relatively lower extent of bonding; and bonding the first and second fibrous layers to each other at a third relatively lower extent of bonding of fibers to one another in the first fibrous layer. Apparatus is also described for carrying out such method by sequential thermal pattern-bonding of the respective web layers.

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