Appeal No. 1997-3099
Application 08/191,886
1. A multilayer cheese packaging film having a thickness of less than 10 mils
and comprising a first outer layer;
a core layer having a thickness of from about 0.05 to less than 0.10 mils comprising
a blend of about 20-70 wt.% of nylon 6/66 copolymer and about 30-80 wt.% of an EVOH
copolymer having a melting point of about 158°C or lower;
a protective second outer layer; and
first and second adhesive layers;
wherein said core layer is between said first and second adhesive layers with (1)
said first adhesive layer being adhered to a first surface of said core layer, said first
adhesive layer being located between said first outer layer and said core layer, and (2)
said second adhesive layer being adhered to an opposing second surface of said core
layer, said second adhesive layer being located between said protective second outer
layer and said core layer; and wherein said film is heat shrinkable at 90°C.
65. A process for making a biaxially stretched, heat shrinkable multilayer film
having a thin core layer which controls oxygen and carbon dioxide permeability of said film
comprising:
coextruding in a tubular form, around a volume of air, melt plastified polymeric
resins having a first outer layer, a core layer comprising a blend of from 30-80 wt.% of an
EVOH copolymer having an ethylene content of about 38 mole % or higher and from 20-70
wt.% nylon 11 or nylon 6/66 copolymer, a second outer layer, first and second adhesive
layers wherein said core layer is between said first and second adhesive layers with (1)
said first adhesive layer being directly adhered to a first surface of said core layer, said
first adhesive layer being located between said first outer layer an said core layer, and (2)
said second adhesive layer being directly adhered to an opposing second surface of said
core layer, said second adhesive layer being located between said second outer layer and
said core layer to form a primary tube wherein said core layer and said first and second
adhesive layers each comprise less than 10% of the total thickness of the primary tube;
cooling and collapsing said primary tube;
reheating said primary tube to an orientation temperature below the predominant
melting point for each layer oriented, simultaneously biaxially stretching said primary tube
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