Process for the preparation of thermoplastic resin film

Details Process for the preparation of thermoplastic resin film Process for the preparation of thermoplastic resin film

1995-05-01

1996-11-19

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Direct application of electrical or wave energy to work

Reshaping, drawing or stretching

2642105, 2642358, 2642902, 264342RE, 264346, B29C 7104, B29C 5512

Patent

active

055759688

ABSTRACT:
A process for preparing a biaxially oriented thermoplastic resin film which comprises: extending a thermoplastic resin sheet in a longitudinal and a transverse directions to form a film thereof, and heat treating the film under a temperature gradient descending from both edges to the center of the film along the transverse direction within a zone defined by the following formula (1) by employing a heater which is located over the film with an angle .theta. of the following formula (3) from said both edges to the center of the film to produce a thermoplastic resin film having uniform physical end chemical properties in the transverse direction:

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patent: 4677188 (1987-06-01), Utsumi et al.
patent: 4684487 (1987-08-01), Gawrisch
patent: 5158637 (1992-10-01), Takashige et al.
patent: 5411695 (1995-05-01), Yamada et al.

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