Press with a plurality of injection plungers

Details Press with a plurality of injection plungers Press with a plurality of injection plungers

1984-10-05

1986-12-30

Hoag, Willard E.

Plastic article or earthenware shaping or treating: apparatus

Control means responsive to or actuated by means sensing or...

Molding pressure control means responsive to pressure at...

425117, 425127, 425129R, 425573, 425588, B29C 300, B29F 106

Patent

active

046326537

ABSTRACT:
A press with a plurality of injection plungers, which can be used to enclose integrated circuits in plastics packages, is provided with additional compensating pistons. The lower ends of the compensating pistons and the upper ends of the injection plungers project into a filling pot in which the plastics material is molded. The injection plungers force the plastics material in the injection mold through channels into cavities provided in the mold. When a predetermined pressure P.sub.k is exceeded, the compensating pistons retreat, so that a pressure drop and, thus, pressure limitation occur. In this manner, scrap would be avoided even if too large a quantity of plastics material were placed in the filling pot.

REFERENCES:
patent: 2470402 (1949-05-01), Jobst
patent: 2582891 (1952-01-01), Strauss
patent: 3278992 (1966-10-01), Strauss
patent: 4008031 (1977-02-01), Weber
patent: 4091057 (1978-05-01), Weber
patent: 4347211 (1982-08-01), Bandoh
patent: 4372740 (1983-02-01), Kuramochi et al.
patent: 4386898 (1983-06-01), Sera
patent: 4511317 (1985-04-01), Bandoh

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