Process for manufacture of a blow molded plastic extruded product
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United States of America Patent
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Jul 18, 2000
Grant Date -
N/A
app pub date -
Jul 24, 1997
filing date -
Jul 24, 1997
priority date (Note) -
Expired
status (Latency Note)
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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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