B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/783
B29C 47/06 (2006.01) B32B 27/08 (2006.01) B65D 65/02 (2006.01)
Patent
CA 1285361
64536-589 ABSTRACT A multilayer film and method of producing a multi- layer film useful in the packaging of high acid food products at elevated temperatures comprising a core layer of ethylene vinyl alcohol copolymer, two intermediate layers each comprising a polyamide; outer blend layers of linear low density polyethylene and anti-blocking agent, and adhesive polymeric materials to adhere the outer blend layers to the respective intermediate polyamide layers. The method of making the multilayer film com- prising: (a) feeding an ethylene vinyl alcohol copolymer melt through a first extruder to an annular coextrusion die; (b) feeding a polyamide melt through a second extruder to the coextrusion die; (c) feeding a melt of an adhesive polymeric material through a third extruder to the coextrusion die; (d) feeding a blend of linear low density polyethylene and an anti-blocking agent, as a melt through fourth and fifth extruders to the coextrusion die; (e) extruding the seven-layer film from the coextrusion die; (f) cooling the coextruded film; (g) collapsing the cooled film; and (h) gathering the collapsed film on a take-up means.
530734
Cryovac Inc.
Smart & Biggar
LandOfFree
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