Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Patent
1996-05-10
1998-09-08
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Shaping against forming surface
264312, 26432811, 26432812, B29C 4526
Patent
active
058041257
ABSTRACT:
Flow lines are eliminated from workpieces injection-molded from liquid crystal polymers, fiber-filled or mineral-filled thermoplastics by selecting a liquified polymer having a linear coefficient of thermal expansion less than (2-6).times.10.sup.-6 /.degree.K, providing a flow path in a mold for the polymer in two directions around a core in the mold, and subjecting the polymer to a shearing energy only simultaneously with mold filling over at least part of the flow path, whereby molecules of the polymer are disoriented and fail to produce a rigid alignment.
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Heitbrink Jill L.
Huber & Suhner AG
Maioli Jay H.
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