Molding method

Details Molding method Molding method

1979-12-10

1982-01-26

Czaja, Donald E.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Including use of vacuum

264101, 264313, 264510, 425389, B29C 114

Patent

active

043128297

ABSTRACT:
A method of molding a plastic part comprising supporting first and second mold sections so as to define a mold cavity, placing a flexible sheet over the second mold section, and forming a vacuum chamber utilizing the flexible sheet with at least the second mold section being in the vacuum chamber. Air passages are provided between the flexible sheet and the second mold section. The air pressure within the vacuum chamber is reduced to less than ambient to create differential pressure across the flexible sheet to hold the second mold section in position. Plastic material is pumped into the mold cavity. After the plastic sets, the second mold section is removed.

REFERENCES:
patent: 3861977 (1975-01-01), Wiley
patent: 4132755 (1979-01-01), Johnson
patent: 4165358 (1979-08-01), Johnson

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