Flat sheet process for production of polyolefin shrink film

Details Flat sheet process for production of polyolefin shrink film Flat sheet process for production of polyolefin shrink film

1981-06-25

1982-06-15

Lowe, James 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

B29C 1702

Patent

active

043350690

ABSTRACT:
A balanced, biaxially oriented polyolefin shrink film is produced using a tenter process by heating the film, stretching the film 7 to 10 times in the transverse direction, cooling the film and then heating and stretching the film 1.5 to 4 times in the longitudinal direction such that the ratio of the transverse stretch to the longitudinal stretch is greater than 2.0.

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patent: 3676539 (1972-07-01), Fisher
patent: 3891737 (1975-06-01), Marsh et al.
patent: 4277594 (1981-07-01), Matthews et al.

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