Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Including application of internal fluid pressure to hollow...
Patent
1988-04-27
1989-11-28
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...
264 28, 264237, 264348, B29C 3516, B29C 4906, B29C 4908, B29C 4918
Patent
active
048836311
ABSTRACT:
A method and apparatus for making a partially crystalline, biaxially oriented heat set hollow plastic container from a hollow parison having an open end and a closed end including engaging the open end of a plastic parison which is at a temperature within its molecular orientation temperature range, enclosing the hot parison in a hot mold, which is at heat setting temperature, expanding the plastic parison within the hot mold by internal pressurization to induce biaxial orientation of the plastic parison and to induce partial crystallization in the biaxially oriented container, exhausting the blow molding fluid while continuously introducing a cooling fluid such as liquid carbon dioxide into the biaxially oriented container and continuously removing the cooling fluid while the hot mold is closed for a period of time, opening the hot mold while continuing to introduce, circulate and remove coolant fluid for a predetermined period of time until the container is cooled sufficiently to prevent significant shrinkage and finally releasing the container.
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Kutach Karen D.
Owens-Illinois Plastic Products Inc.
Silbaugh Jan H.
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