Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Shaping by extrusion
Patent
1983-08-18
1985-08-27
Czaja, Donald
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Shaping by extrusion
2642101, 2642356, D01D 512
Patent
active
045377383
ABSTRACT:
3-Hydroxybutyrate polymers are formed into oriented shaped articles by drawing a partially crystallized preform to increase at least one dimension by at least 200%, and then increasing the degree of crystallization while maintaining the drawn preform in the drawn condition.
REFERENCES:
patent: 4360488 (1982-11-01), Barham et al.
patent: 4427614 (1984-01-01), Barham et al.
Czaja Donald
Fertig Mary Lynn
Imperial Chemical Industries plc
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