Method and mold for manufacture of a solid molded article,...

Details Method and mold for manufacture of a solid molded article,... Method and mold for manufacture of a solid molded article,...

2005-01-04

2005-01-04

Loney, Donald J. (Department: 1772)

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

To produce composite, plural part or multilayered article

C264S279000, C264S303000, C264S308000, C156S244250, C156S245000

Reexamination Certificate

active

06838031

ABSTRACT:
A method for molding a thick part without significant surface distortion is disclosed. A cavity mold having a first core mold portion with strakes is used to create a first molded form having ribs proportioned and spaced apart to prevent distortions on one surface of the part due to shrinkage. A second core mold portion replaces the first core mold portion for creation of a second molded form having complementary ribs which are similarly proportioned to prevent distortions in an opposite surface of the part. The first form acts as a mold for the second form, the complementary ribs fuse together and form a homogeneous mass between the opposite surfaces of the part.

REFERENCES:
patent: 5529742 (1996-06-01), Strapazzini
Robert A. Malloy, Copyright Hanser Publishing, 1994 λPlastic Part Design for Injection Molding@, pp. 222, 223.

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