B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
154/1, 154/84
B32B 27/02 (2006.01) B29C 55/02 (2006.01) B29D 7/00 (2006.01) B32B 27/32 (2006.01) B29C 71/00 (2006.01)
Patent
CA 1222935
Abstract of the Disclosure A method of preparing a high strength sheet material com- prising (a) forming a laminate comprising at least two layers of a thermoplastic polymer material, each layer having a fibrillar grain structure providing a predominant direction of splittability in each said layer, and wherein the layers are bonded to one another with the said predominant directions of splittability transverse to each other, (b) biaxially orienting the molecules of said layers by stretch- ing the layers in substantially uniaxial steps, the transverse stretch- ing being effected by applying pressure to the surface of the laminate along lines extending substantially in the longitudinal direction of the laminate to impart thereto a waved configuration, and (c) subjecting the biaxially oriented laminate to a heat treatment while allowing at least 7% shrinkage of the laminate to take place in at least its trans- verse direction.
424450
Fetherstonhaugh & Co.
Rasmussen Ole-Bendt
LandOfFree
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