Low temperature heat shrinkable film and process for producing t

Details Low temperature heat shrinkable film and process for producing t Low temperature heat shrinkable film and process for producing t

1992-01-06

1994-03-15

Buffalow, Edith

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Reshaping running or indefinite-length work

428500, B29C 4900

Patent

active

052943984

ABSTRACT:
The present invention provides a low temperature heat shrinkable film comprising a linear low density polyethylene resin having a short branched chain and a density of 0.935 g/cm.sup.3, and whose film properties are such that the haze value is 5% or less, the heat shrinkages at 90.degree. C. in the M and T directions are 30% or more and 5% or less, respectively , and the shrinkage stress at 90.degree. C. in the M direction is 300 g/mm.sup.2 or more. This transparent film having an excellent low temperature heat shrinkability can be produced by drawing a film of the above-mentioned polyethylene resin between two rolls having a diameter of 200 mm or less at an air gap of 10 mm or less at a draw ratio of 3.0 to 6.0. Further, an inflation film having a multilayer structure can be obtained by press bonding or press bonding and drawing a plurality of films comprising the above-mentioned polyethylene resin. This laminate film has an excellent transparency and strength, and has a uniform film thickness.

REFERENCES:
patent: 4243619 (1981-01-01), Fraser et al.
patent: 4258166 (1981-03-01), Canterino et al.
patent: 4661401 (1987-04-01), Akao
patent: 4668752 (1987-05-01), Tominari et al.
patent: 4913977 (1990-04-01), Taka et al.

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