Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Including application of internal fluid pressure to hollow...
Patent
1996-08-08
1999-05-04
Timm, Catherine
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Including application of internal fluid pressure to hollow...
264506, B29C 4900
Patent
active
059002050
ABSTRACT:
A blow molded product which is generally tubular having first and second open ends and, a bellows section intermediate said first and second ends so that said product is flexible, has a skirt adjacent one of said first and second ends. The bellows section is formed in a blow molding operation and the skirt section is formed by compression molding. A preferred embodiment of the product has a rib extending internally of the wall of the blow molded section to strengthen the transition region between the bellows section and the compression compresses the steps of confining a parison in a mold and then introducing a core into the parison in the mold. The core moves thermoplastic material axially and possibly also radially and circumferentially. This process enables molding of a product with an external surface which may be substantially cylindrical with an internal surface which has lobes, ribs or other internal projections.
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Sadr Changize
White Jamie
Salflex Polymers Ltd.
Timm Catherine
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