Method of producing a molded article using a mold assembly with

Details Method of producing a molded article using a mold assembly with Method of producing a molded article using a mold assembly with

1996-05-23

1998-04-21

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Composite or multiple layer

249115, 249134, 249135, 264 22, 2643281, 2643287, 2643289, 264335, 264337, 264338, 264572, 425190, 425437, 425444, 425468, 425546, 425555, 425556, 425577, 425DIG247, B29C 4537

Patent

active

057414467

ABSTRACT:
A method is disclosed for the production of a molded article, using a mold assembly including a mold having a cavity, for producing a molded article from a thermoplastic resin; an insert block formed of ceramic or glass having a thermal conductivity of 2.times.10.sup.-2 cal/cm.sec..degree.C. or less, the insert block being disposed inside the mold, constituting part of the cavity, and having a thickness of 0.5 mm to 10 mm; and a cover plate for covering a peripheral portion of the insert block. The cover plate is attached to the mold and constitutes part of the cavity, wherein a clearance between the insert block and the cover plate is 0.001 mm to 0.03 mm, an amount of overlapping of the insert block and the cover plate is at least 0.1 mm. The method includes filling a molten thermoplastic resin in the cavity, and then cooling the thermoplastic resin to solidness.

REFERENCES:
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patent: 4704079 (1987-11-01), Pluim, Jr.
patent: 4731013 (1988-03-01), Schrammel
patent: 4783041 (1988-11-01), Sakaida et al.
patent: 5151232 (1992-09-01), Thornthwaite et al.
patent: 5362226 (1994-11-01), Kataoka et al.
patent: 5620635 (1997-04-01), DeRozier et al.

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