Method of making partially crystalline biaxially oriented hollow

Details Method of making partially crystalline biaxially oriented hollow Method of making partially crystalline biaxially oriented hollow

1987-03-04

1989-06-13

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...

264528, 264530, 264537, 264542, 425530, 425534, 425538, B29C 4918, B29C 4930, B29C 4932

Patent

active

048391271

ABSTRACT:
A method for making a partially crystalline, biaxially oriented heat set hollow plastic container from a hollow 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, positioning a mold base in axial alignment with said engaged hot parison, enclosing a hot mold about the mold base, the mold being at heat setting temperature, expanding the plastic parison within the hot mold and mold base 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, lowering the internal pressure in the container, opening the hot mold while maintaining engagement of the open end and engagement of the mold base with the blown hollow container, maintaining a lower internal pressurization of the container to prevent significant shrinkage, and cooling the container while maintaining engagement of the open end and engagement of the mold base with the container and maintaining pressure in the container at least sufficient to prevent shrinkage.

REFERENCES:
patent: 4066726 (1978-01-01), Mehnert
patent: 4224263 (1980-09-01), Kontz
patent: 4385089 (1983-05-01), Bonnebat et al.

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