Process for deep drawing composite thermoplastic foil with a PVD

Details Process for deep drawing composite thermoplastic foil with a PVD Process for deep drawing composite thermoplastic foil with a PVD

1987-11-04

1989-10-31

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Producing multilayer work or article

264553, 264292, 264322, 425388, B29C 5110, B29C 5114

Patent

active

048775711

ABSTRACT:
A cuppable composite thermoplastic foil with a PVDC layer is subjected to a cupping process at a definite temperature and the container is formed by the cupping process, especially a vacuum cupping process. To provide a stronger and more stable container for food packaging the composite foil is heated to a temperature above the crystallization temperature of PVDC and because of that the crystal structure of the PVDC is broken up. The crystallization degree of the composite foil is reduced at least 50%, after which the composite foil is quenched at a temperature of less than 75.degree. C., advantageously below 50.degree. C. The cupping process is performed immediately after the quenching.

REFERENCES:
patent: 4076570 (1978-02-01), Medley et al.
patent: 4404162 (1983-09-01), Miki et al.
patent: 4579784 (1986-04-01), Lemstra et al.
patent: 4714580 (1987-12-01), Maruhashi et al.
Plastics Engineering Handbook of the Society of the Plastics Industry, Inc., 4th Edition, 1976, pp. 46 and 47.

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