Method and apparatus for vacuum transfer molding

Details Method and apparatus for vacuum transfer molding Method and apparatus for vacuum transfer molding

1997-08-13

1998-09-22

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

Vacuum treatment of work

To degas or prevent gas entrapment

2643284, 26432816, 425544, 425546, 425584, 425589, B29C 4502

Patent

active

058110410

ABSTRACT:
Method and apparatus for manufacturing void free products using vacuum transfer molding. The method comprises evacuating gas from a preheated resin mixture in an injection accumulator assembly before injection into a mold. The apparatus includes a fixed upper platen assembly supporting an injection accumulator assembly having appended thereto a gas exhausting means and a feed material holding canister on its upper surface and an upper match mold portion on its lower surface. The movable lower platen assembly supports a lower match mold portion on its upper surface and is supported by a plurality of hydraulic cylinders of a bottom plate assembly. The platen assemblies include a sandwich of a press plate, an insulating fiber board and an internally heated platen.

REFERENCES:
patent: 2475378 (1949-07-01), De Ghetto
patent: 5435953 (1995-07-01), Osada et al.
patent: 5460502 (1995-10-01), Majercak
patent: 5501587 (1996-03-01), Kwak
patent: 5626887 (1997-05-01), Chou et al.

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