Uniaxial polyolefin/filler films for controlled atmosphere...

Details Uniaxial polyolefin/filler films for controlled atmosphere... Uniaxial polyolefin/filler films for controlled atmosphere...

B - Operations, Transporting

29

D

18/1032

B29D 7/01 (2006.01) B29B 9/06 (2006.01) B29C 55/00 (2006.01) B65D 81/20 (2006.01) C08J 5/18 (2006.01)

Patent

CA 1311101

ANTOON CASE No. 2 UNIAXIALlY ORIENTED FILLED FILMS FOR CONTROLLED ATMOSPHERE PACKAGING Abstract of the Disclosure A uniaxially oriented, polyolefin film is prepared by melt blending a mixture of a polyolefin, an inert filler, and a processing aid such as calcium stearate, maintaining the moisture level in the melt blend below 700 ppm, casting a film, and uniaxially stretching the film at least about 2 times its original casting dimension in one direction until the film has a sufficient number of elongated, microporous voids in order to create a CO2 and 02 permeance in the range of 5,000 to 10,000,000 cc/1002-atm-day, the a film being used as a panel in a side of a controlled atmosphere packaging container that is otherwise substantially gas impermeable.

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