Method for producing injection molded and centrally apertured di

Details Method for producing injection molded and centrally apertured di Method for producing injection molded and centrally apertured di

1980-03-24

1983-05-10

Pavelko, Thomas P.

Plastic and nonmetallic article shaping or treating: processes

Forming sound grooves in records

264155, 264161, 425810, B29D 1700

Patent

active

RE0312355

ABSTRACT:
Heated material is injected into an annular cavity, defined by a pair of mold-halves, through a sprue passage, defined by a sprue bushing and an end portion of a punch. The annular cavity and the sprue passage form, respectively, the centrally apertured part and a sprue. After partial cooling of the heated material, the punch is locked in place while the annular cavity is displaced relative to the sprue passage so that the sprue is severed from the part along the peripheral surface of the punch end portion. The mold halves are separated to open the annular cavity while the sprue is resting on the punch end portion, and while the part is held by the punch end peripheral surface. After the mold halves are separated, a sprue ejector member and a part ejector member are actuated to eject, respectively, the sprue and the part from the punch end portion.

REFERENCES:
patent: 2330369 (1943-09-01), Marsh
patent: 2642621 (1953-06-01), Amo
patent: 3649728 (1972-03-01), Honsho
patent: 3937779 (1976-02-01), Simmons

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