Process of making stretchable, heat shrinkable polyethylene film

Details Process of making stretchable, heat shrinkable polyethylene film Process of making stretchable, heat shrinkable polyethylene film

1989-08-15

1992-07-21

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Production of continuous or running length

2642095, 2642902, B29C 5526, B29C 5528

Patent

active

051320746

ABSTRACT:
A stretchable, heat shrinkable ethylene-.alpha.-olefin copolymer film which has excellent stretchability as well as shrinkability at a low temperature and is useful as a good packaging material is prepared by melt extruding a composition including at least one ethylene-.alpha.-olefin copolymer as a main component to give a non-stretched film and biaxially stretching the film in a temperature region where an orientation can be induced and at an area stretching ratio of not less than 8 under conditions such that a tensile strength is from 30 to 170 kg/cm.sup.2. The film has an index of refraction N of 1.500 to 1.522, a degree of orientation Wk according to X-ray diffraction method of 0.78 to 0.93 and an area shrinkage of not less than 15% at 90.degree. C.

REFERENCES:
patent: 4354997 (1982-10-01), Mizutani et al.

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