CLEAR ORIENTED POLYESTER MATERIAL

摘要

A process for the preparation of clear, oriented polyester material, comprises providing an orientable thermoplastic workpiece of the polyester material, heated to a temperature from 55 DEG C to 110 DEG C, at the entry side of a reducing die; and deforming the workpiece by passage through the die in the solid phase at a nominal deformation ratio of at least 2:1, by means of hydrostatic pressure applied upstream of the die and/or by drawing the workpiece from downstream of the die.