Balanced pressure compression molding method

Details Balanced pressure compression molding method Balanced pressure compression molding method

1991-08-30

1993-07-06

Woo, Jay H.

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

264257, 156 622, 425444, B29C 4314

Patent

active

052251357

ABSTRACT:
A balanced pressure compression molding method in which a first charge of a plastic material that will at least constitute the reinforcing means, i.e., the ribs and/or bosses, is first placed in the mold and compressed, the mold is then opened and a second charge of the plastic material is placed in the mold to constitute the flat or panel portion of the panel part after compression. A force is applied to the ejector means of the molding apparatus such that a pressure between 500 to 1500 psi is generated inside the rib sections. This force is removed before the end of the molding cycle. A plastic part having a perfect appearance surface without sink mark defects can be produced.

REFERENCES:
patent: 4009978 (1977-03-01), Hanning
patent: 4353857 (1982-10-01), Ray et al.
patent: 4636422 (1987-01-01), Harris et al.
patent: 4867670 (1989-09-01), Munk
patent: 4929170 (1990-05-01), Boskovic
patent: 4937032 (1990-06-01), Krone et al.
patent: 5089206 (1992-02-01), Kia

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