Polypropylene heat shrinkable film

Details Polypropylene heat shrinkable film Polypropylene heat shrinkable film

1996-09-13

1997-12-30

Thibodeau, Paul J.

Stock material or miscellaneous articles

Hollow or container type article

Shrinkable or shrunk

428 351, 428910, 525240, 525243, B65B 5300, C08L 2314

Patent

active

057027846

ABSTRACT:
The heat shrinkable film includes at least one of an ethylene-propylene random copolymer and an ethylene-propylene-butene random copolymer and a propylene-butene copolymer of low crystallinity, which is biaxially stretched simultaneously by a ratio of 2.0-3.5 times for each of the machine direction and the transverse direction by a wet heating method. The film preferably has a tensile elongation at breaking of more than 200%, and a heat shrinking ratio of more than 8% for each of the machine direction and the transverse direction when it is immersed in glycerine at 80.degree. C. for 30 sec. Since the file is excellent in tensile elongation and has satisfactory heat shrinkability at low temperature, it is suitable as a film for use in an automatic L-bar sealer in which a tensile elongation at breaking is an important factor.

REFERENCES:
patent: 4894421 (1990-01-01), Kioka et al.
patent: 5219002 (1993-06-01), Stenger et al.
patent: 5266641 (1993-11-01), Asanuma et al.
"Films", The Encyclopedia of Polymer Science and Engineering, vol. 7, pp. 80-87 1985.

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