Methods of and apparatus for producing biaxially oriented polyme

Details Methods of and apparatus for producing biaxially oriented polyme Methods of and apparatus for producing biaxially oriented polyme

1988-11-08

1990-09-11

Schroeder, Werner H.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Reshaping running or indefinite-length work

428220, 264175, 26417716, 26417717, 2642902, 264323, 425363, 425364R, 425384, 425394, 425407, 425411, B29C 4222, B29C 5516, B29C 4316, B29C 4348

Patent

active

049561405

ABSTRACT:
In accordance with the instant invention, biaxially oriented polymer sheet is produced by continuously forging polymer feedstock between a pair of converging belts in an isochoric deformation region to form the sheet from the feedstock. The resulting sheet is immediately annealed after being formed and subsequently cooled after being annealed by passage through an isobaric region defined by a pair of opposed parallel belts backed by a pair of opposed parallel platens which interface with the belts via an oil seal so as to transfer heat from the sheet through the belts to the cooled platens. The resulting sheet has substantially uniform strain distribution over the width and length thereof as well as through the thickness thereof while maintaining its flatness after emerging from the apparatus.

REFERENCES:
patent: 3147164 (1964-09-01), Adams
patent: 3795470 (1974-03-01), De Mets
patent: 3904336 (1975-09-01), Axer et al.
patent: 4216179 (1980-08-01), Lamberts et al.
patent: 4792426 (1988-12-01), Greatorex et al.

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