Process of making polypropylene heat shrinkable film

Details Process of making polypropylene heat shrinkable film Process of making polypropylene heat shrinkable film

1997-09-03

1998-08-04

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Reshaping running or indefinite-length work

53450, 53476, 53477, B29C 5516, B65B 5110

Patent

active

057888981

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 film 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: 4343852 (1982-08-01), Isaka et al.
patent: 4894421 (1990-01-01), Kioka et al.
patent: 5219002 (1993-06-01), Stenger et al.
patent: 5266641 (1993-11-01), Asanuma et al.

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