Method of making partially crystalline biazially oriented heat s

Details Method of making partially crystalline biazially oriented heat s Method of making partially crystalline biazially oriented heat s

1988-03-24

1989-08-01

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Including application of internal fluid pressure to hollow...

264535, 425530, 425538, B29C 4918, B29C 4932, B29C 4964

Patent

active

048531715

ABSTRACT:
A method for making a partially crystalline, biaxially oriented heat set hollow plastic container from a hollow poly(ethylene) terephthalate parison having an open end and a closed end comprising engaging the open end of a plastic parison which is at a temperature within its molecular orientation temperature range, enclosing a hot mold about the hot parison, the mold being at heat setting temperature, expanding the plastic parison within the hot mold by internal pressurization to induce biaxial orientation of the plastic parison and force the plastic parison into intimate contact and conformance with the hot mold and to maintain contact by such internal pressurization between the mold and the biaxially oriented container for a time sufficient to induce partial crystallization in the biaxially oriented container, maintaining a lower internal pressurization of the container to prevent significant shrinkage, opening the hot mold while maintaining engagement of the open end of the blown hollow container, enclosing the blown hollow container in a cold mold having substantially the same volume as the hot mold, or smaller, increasing the pressurization to force the container into intimate contact with the cold mold to cool the container while maintaining internal pressurization and then exhausting the pressure and opening the cold mold. The method results in a thermally stable container.

REFERENCES:
patent: 4066726 (1978-01-01), Mehnert
patent: 4122141 (1978-10-01), Krall et al.
patent: 4385089 (1983-05-01), Bonnebat et al.

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