Method for producing doubly oriented polymers

Details Method for producing doubly oriented polymers Method for producing doubly oriented polymers

1990-10-01

1991-09-17

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Reshaping running or indefinite-length work

2642884, B29C 4322

Patent

active

050493477

ABSTRACT:
A process for the solid phase preparation of doubly oriented synthetic polymeric material from an orientable amorphous but crystallizable or a semicrystalline thermoplastic polymeric workpiece comprising: (a) presenting the conditioned workpiece, at the entry mode of an opposing pair of solid rollers that are spaced apart a distance substantially less than the thickness of the workpiece; and (b) deforming the workpiece by compressive passage through the paired rollers at a nominal deformation ratios of at least 2 to 1. The deformation drawing is carried out between the glass transition temperature and the melting point of the polymeric material, by applying a draw tension insufficient to cause tensile failure of the workpiece.

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patent: 4587163 (1986-05-01), Zachariades
patent: 4643865 (1987-02-01), Okada et al.
patent: 4789514 (1988-12-01), Lo

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