Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Including application of internal fluid pressure to hollow...
Patent
1997-07-24
2000-07-18
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...
264540, B29C 4904
Patent
active
060903392
ABSTRACT:
A process for blow molding a hollow plastic product comprises introducing a hollow elongated parison of thermoplastic material between a pair of opened sections of a blow mold, and then closing the mold. The mold sections are closed along a linear direction of travel and, when closed, form a mold cavity including a narrow section extending in the direction of travel. The narrow section has a width less than about twice a wall thickness of the parison. As the mold sections close, they sever and enclose a segment of the parison within the mold cavity and shear a double-wall section of the parison into the narrow section to form a reinforcing flange on the product. Upon closing of the mold, a predetermined pressure is provided to an interior of the parison to expand the parison against internal surfaces of the mold cavity to form the remainder of the product. A mold for use in blow molding a hollow plastic product and a one-piece hollow plastic product made by the blow molding process are also disclosed.
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Quotation dated Jun. 26, 1996 labeled "Document A" (including related plastics tooling cost estimate).
Confirmation dated Jul. 12, 1996 labeled "Document B".
Meeting notes dated Apr. 26, 1996 labeled "Document C".
Project notes dated Jul. 10, 1996 labeled "Document D".
Meeting notes dated May 14, 1996 labeled "Document E".
Preliminary sketches dated May 3, 1996, labeled "Document F".
Timm Catherine
Western Industries Inc.
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