B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/764
B29C 29/00 (1980.01)
Patent
CA 1163076
MULTILAYER FILM MANUFACTURE UTILIZING SCRAP RESIN ABSTRACT OF THE DISCLOSURE A novel system for producing film by extruding and/or casting at least two layers of resin, such as polyacrylonitrile homopolymer or interpolymers. The system provides for co-extruding a continuous multi layer film with contiguous or tandem dies from a first supply of homogeneous resin solution and a second supply of non-homogeneous redissolved resin scrap. The film may be cast onto a smooth cooled drum surface to form substantially continuous adjacent layers from two or more resin supplies. By stripping the film from the drum as a continuous film strip and stretching the film an oriented structure is provided. Scrap resin, such as selvage trimmed from the stretched film or mill scrap, is comminuted and redissolved in solvent for recycle to the second supply of the extrusion step. The homogeneous layer prevents film disruption by inhomogeneities present in the contiguous layer containing redissolved scrap, which might cause localized stresses in the film and discontinuities during stretching.
418271
Gowling Lafleur Henderson Llp
Mobil Oil Corporation
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