Methods of moulding of plastics articles

Details Methods of moulding of plastics articles Methods of moulding of plastics articles

1983-10-31

1984-12-25

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

264 402, 26427211, 2643289, 26432812, 425146, 425149, B29C 600, B29F 100

Patent

active

044903154

ABSTRACT:
A method of moulding by low pressure moulding wherein a passage from the mould cavity is bridged by the molten material during filling and in which the moulding pressure is too low to cause the material to flow down the passage. After the mould is completely filled, the pressure increases to cause penetration of the molten material along the passage to a switch operating position to operate a switch to stop further flow of material into the mould.

REFERENCES:
patent: 2332674 (1943-10-01), Smith
patent: 2474885 (1949-07-01), Blomquist
patent: 3226463 (1965-12-01), Wallace
patent: 3559247 (1971-02-01), Larsson
patent: 3840312 (1974-10-01), Paulson et al.
patent: 4405083 (1983-09-01), Charlebois et al.

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