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US 8,895,103 B2Granted
Shrinkable film and method for manufacturing same
AssigneeKolon Industries, Inc.
InventorsDong Jin Kim, Si Min Kim, Yun Jo Kim, Gi Sang Song
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Abstract
Provided are a film for food packaging, capable of having excellent adhesion with a metal deposition layer and thus retaining moisture barrier property while having superior flexibility, transparency, and biodegradability, and a method for manufacturing the same.
Claims4
A method for manufacturing a shrinkable film, the method comprising:
- a) preparing an unstretched film by melting and extruding 10-99 wt % of lactic acid and 1-90 wt % of aliphatic or aliphatic-aromatic polyester resin;
- b) coating a water-dispersed polyurethane coating composition on one surface of the unstretched film through an in-line coating process;
- c) uniaxially stretching the unstretched film coated with the water-dispersed polyurethane coating composition in the transverse direction (TD);
- d) heat-treating the uniaxially stretched film at 50-100° C.;
- and
- e) forming a metal deposition layer with a thickness of 200 Å-1000 Å on a polyurethane coating layer of the uniaxially stretched film.
3 more elements
Dependencies are inferred from the claim text.