Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With coupling between charger and mold
Patent
1990-02-22
1991-04-09
Housel, James C.
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With coupling between charger and mold
249107, 249141, 249142, 425123, 4251291, 425577, 425812, B29C 4527
Patent
active
050060597
ABSTRACT:
A mold for injection molding including a cylindrical outer mold and a columnar inner mold. The inner mold is provided, on its external circumferential surface, with a large number of tooth-shaped grooves extending in the axial direction thereof, and it is placed inside the outer mold to define an annular cavity between the external circumferential surface of the inner mold and the internal circumferential surface of the outer mold. The outer mold is provided with a plurality of runners extending axially near the internal circumferential surface. The runners are arranged at regular annular intervals along the circumference of the outer mold. Furthermore, slit-shaped gates are formed along the full length of the runners, the gates opening into the internal circumferential surface of the outer mold, in such a way that the inflow of molten molding material flowing from each runner into the cavity is gradually reduced along the runner from the upstream side towards the downstream end.
REFERENCES:
patent: 1928325 (1933-09-01), Apple
patent: 3425883 (1969-02-01), Smith
patent: 3441641 (1969-04-01), Roberts
patent: 4174367 (1979-11-01), Breher
Hakoda Keizo
Samejima Hisashi
Bando Kagaku Kabushiki Kaisha
Housel James C.
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