Container comprising uniaxial polyolefin/filler films for contro

Details Container comprising uniaxial polyolefin/filler films for contro Container comprising uniaxial polyolefin/filler films for contro

1989-05-22

1990-05-08

Weinstein, Steven

Food or edible material: processes, compositions, and products

Packaged or wrapped product

Packaging structure cooperating with food generated gas

426106, 426415, 426419, 47 84, A23B 7148, B65D 8550, B65D 8120

Patent

active

049237039

ABSTRACT:
A container comprising an uniaxially oriented, polyolefin film, which film is prepared by melt blending a mixture of a polyolefin, an inert filler, a processing aid such as calcium stearate, and optionally a stabilizer, 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 dimensions in one direction until the film has a sufficient number of elongated, narrow shaped, microporous voids in order to create a CO.sub.2 and O.sub.2 permeance in the range of 5,000 to 10,000,000 cc/100.sup.2 - atm - day. Such a film is used in a controlled atmosphere packaging container as a panel in a window for a controlled flow or flux of CO.sub.2 and O.sub.2 through its wall in an otherwise gas impermeable container.

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