Process for producing a heat-shrinkable polypropylene film

Details Process for producing a heat-shrinkable polypropylene film Process for producing a heat-shrinkable polypropylene film

1985-08-07

1987-03-10

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Disparate treatment of article subsequent to working,...

Effecting temperature change

2642902, B29C 5514

Patent

active

046490094

ABSTRACT:
A process for producing a heat-shrinkable polypropylene film, which comprises stretching a film of a polypropylene resin firstly in one direction, then heat-treating it, and further stretching it in a direction perpendicular to the direction of the first stretching.

REFERENCES:
patent: 3223764 (1965-12-01), Kahn et al.
patent: 3265769 (1966-08-01), Schaffhausen
patent: 3551546 (1970-12-01), Gosper et al.
patent: 3773609 (1973-11-01), Haruta et al.
patent: 3808304 (1974-04-01), Schirmer
patent: 3900534 (1975-08-01), Schard
patent: 4335069 (1982-06-01), Levy
patent: 4343852 (1982-10-01), Isaka et al.

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