Shrinkable polyamide film and process for its production

Details Shrinkable polyamide film and process for its production Shrinkable polyamide film and process for its production

1982-03-24

1984-02-14

Herbert, Jr., Thomas J.

Stock material or miscellaneous articles

Composite

Of polyamide

428341, 428349, 4284744, 428523, B32B 2708, C09J 702

Patent

active

044317050

ABSTRACT:
A shrinkable polyamide film useful for wrapping hams, sausages, etc. The shrinkable film has a hydrothermal shrinking ratio of at least 30% in both MD and TD and a hydrothermal shrinkage stress of from 300 to 700 g/mm.sup.2. The film is produced by a process which comprises biaxially stretching a substantially amorphous film composed of a copolymer of 6,6-nylon/6-nylon in a weight ratio of from 5/95 to 25/75 at a temperature of not higher than 120.degree. C. and at a stretching ratio of at least 2.5 times in both MD and TD, and subjecting the stretched film to stress relaxation at a temperature of from the stretching temperature to 170.degree. C., followed by winding it up. Further, a shrinkable film having an oxygen gas permeability of not more than 20 cc/m.sup.2 .multidot.24 hrs. atm. as well as the above properties may be obtained by coating a polyvinylidene chloride resin prior to the stretching so that its solid content after the stretching becomes to be at least 0.5 g/m.sup.2.

REFERENCES:
patent: 3661677 (1972-05-01), Wang
patent: 3746565 (1973-07-01), Schneider et al.
patent: 3805848 (1974-04-01), Chrow
patent: 3826676 (1974-07-01), Heling
patent: 3908070 (1975-09-01), Marzolf

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