Compression molding apparatus having vacuum chamber

Details Compression molding apparatus having vacuum chamber Compression molding apparatus having vacuum chamber

1983-04-25

1984-12-18

Hoag, Willard E.

Plastic article or earthenware shaping or treating: apparatus

Means to create a vacuum or apply fluid pressure within a...

156382, 425DIG60, B29G 202, B29G 100

Patent

active

044888627

ABSTRACT:
Apparatus is disclosed for compression molding a part from a charge having a curable resin therein. Provision is made for defining a vacuum chamber surrounding the mold cavity when the upper and lower dies are brought to a partially closed position. The vacuum chamber includes a vertically movable ring surrounding the upper die which is urged into sealing engagement with a surface surrounding the lower die. The space between the ring and the upper die is sealed with a flexible diaphragm having an inner edge rigidly attached to the upper die and an outer periphery rigidly attached to the ring member thereby permitting relative vertical movement between the ring and die. The mold cavity is rapidly evacuated and then the upper die is brought into a fully closed position while the resin cures.

REFERENCES:
patent: 2452382 (1948-10-01), Long
patent: 3504070 (1970-03-01), Zaharski
patent: 3871060 (1975-03-01), Ladney
patent: 3959434 (1976-05-01), Squier
patent: 4092393 (1978-05-01), Marocco
patent: 4267142 (1981-05-01), Lankheet
patent: 4374080 (1983-02-01), Schroeder
patent: 4416841 (1983-11-01), Corea et al.

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