Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With preform severing means movable relative to mold
Patent
1985-11-18
1987-12-29
Woo, Jay H.
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With preform severing means movable relative to mold
264107, 425554, 425556, 425577, 425810, 425DIG51, 425DIG58, B29C 4538, B29C 4544
Patent
active
047158069
ABSTRACT:
A sprue part is cut and removed from the injection mold part during the manufacture of information storage disks by an injection molding process. The highly sensitive molding of an information storage disk is protected from damage by the sprue and the deposition of dust particles during stripping by this process. The sprue is punched into a part serving as the die of the injection molding tool and subsequently removed, in particular by suction, through an orifice leading from inside the part, together with the dust particles generated in the punching process. Preferably, the sprue is punched out and removed with the injection molding tool closed. The injection molding tool must be opened only after the sprue and the dust have already been removed, thus ensuring that the molded product has an especially good quality.
REFERENCES:
patent: 2992455 (1961-07-01), Salzman
patent: 3649728 (1972-03-01), Honsho et al.
patent: 4185955 (1980-01-01), Holmes et al.
patent: 4260360 (1981-04-01), Holmes et al.
patent: 4466934 (1984-09-01), Cane et al.
Ehrler Ernst
Eichlseder Martin
Theiss Edmund
Hettbrink Timothy W.
Koch Robert J.
Krauss-Maffei A.G.
Woo Jay H.
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