Method and apparatus for venting entrapped air in mold cavities

Details Method and apparatus for venting entrapped air in mold cavities Method and apparatus for venting entrapped air in mold cavities

1977-02-17

1978-05-23

Husar, Francis S.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

249 79, 425546, 425552, 425812, B29F 100

Patent

active

040910695

ABSTRACT:
Air that becomes entrapped in a closed mold cavity during the injection of liquid plastic material into the cavity is vented into the flowing liquid coolant of the mold to be exhausted therewith while leakage of coolant into the mold cavity during nonventing is prevented by maintaining the coolant at less than atmospheric pressure.

REFERENCES:
patent: 3078508 (1963-02-01), Martin, Jr.
patent: 3125780 (1964-03-01), Harrison et al.
patent: 3169272 (1965-02-01), Maxson
patent: 3497173 (1970-02-01), Valyi
patent: 3804566 (1974-04-01), Kimura et al.

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