B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/523
B29C 49/04 (2006.01) B29C 47/06 (2006.01) B29C 47/20 (2006.01) B29C 69/00 (2006.01) B29C 71/02 (2006.01) B32B 27/08 (2006.01) B32B 37/28 (2006.01) B32B 38/00 (2006.01) B29C 35/08 (2006.01) B29C 59/04 (2006.01) B29C 59/10 (2006.01) B29C 59/16 (2006.01) B29C 61/02 (2006.01)
Patent
CA 1225210
ABSTRACT A method and apparatus for manufacturing a film suitable for use in lamination under heat and pressure. A plurality of resins is co-extruded into concentric annuli, the inner annulus being a polyester type resin, and at least one of the outer annuli consisting of a polyolefin based resin. The co-extrusion is carried out as the extruding die is rotated about its axis. After quenching to form a multi-layer seamless tube, the tube is collapsed and heated to a temperature suit- able for biaxial orientation. An air bubble is intro- duced into the heated tube to expand the diameter there- of and simultaneously orient the tube biaxially by molecular orientation. The biaxially oriented tube is cooled sufficiently to retain its molecular orientation, and is then collapsed. The tube is then heated to a shrinking temperature while under controlled restrain to achieve a predetermined dimen- sion in amount of shrinkage in the film. Finally, the edges of the shrunk tube are slit to form a pair of flat films. Additional improvements are achieved by including irradiation of the films by ultraviolet light, and by treating one of the film surfaces with a corona discharge.
465006
General Binding Corporation
Smart & Biggar
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