Plastic article or earthenware shaping or treating: apparatus – Female mold and means to shape parison directly by internal... – Including means to prepare parison
Patent
1976-07-20
1977-12-27
Lazarus, Richard B.
Plastic article or earthenware shaping or treating: apparatus
Female mold and means to shape parison directly by internal...
Including means to prepare parison
425533, 425534, B29D 2303
Patent
active
040652467
ABSTRACT:
In an injection blow molding process for making plastic receptacles, an injection station is provided for injection molding a parison of selected configuration. An expansion and blowing station follows for initially expanding the parison to a predetermined length, and thereafter the parison is blow molded into a predetermined lateral and final configuration to thereby biaxially orient the molecular structure of the parison. An ejection station is provided for removing the finished product from the apparatus. The parison is transferred along a first path away from the injection station, along a second path which is normal to the first path and then along a third path parallel to the first path to the expansion and blowing station. At the same time, a finished product is transferred from the blowing station to the ejection station along a corresponding path. The blow molding station is adjustable or interchangeable so that different size containers can be molded without changing the size of the injection cavity. The apparatus may also be designed with a core pin arrangement to insert a liner within an outer plastic parison shell prior to the blow molding process at which time the liner and parison shell will weld together to form a finished container. Close temperature control is provided with the parison being maintained with a desired temperature range to retain the biaxial orientation. Finally, the apparatus is designed to facilitate removal of the finished product to further work stations for subsequent work thereon.
REFERENCES:
patent: 3944643 (1976-03-01), Sato et al.
patent: 3966378 (1976-06-01), Valyi
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