Faster cycling sprue for centerhole - tearout optical disk injec

Details Faster cycling sprue for centerhole - tearout optical disk injec Faster cycling sprue for centerhole - tearout optical disk injec

1993-07-20

1994-08-23

Nugyen, Khanh

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

With means to heat or cool

425556, 425577, 425436R, 425444, 425810, 264107, B29C 4540

Patent

active

053403037

ABSTRACT:
Faster injection molding cycles in an optical disk mold which forms the centerhole by tearing out the sprue can be obtained by increasing the "hot strength" of the sprue by addition of a plurality of rigidifying ribs onto only the B side of the sprue. This plurality of molded-in ribs is formed within a mating plurality of female cavities cut into the axially displaceable ejector sleeve, within which is guided an axially displaceable ejector pin, all within the displaceable half of the moldset. These ribs are circumferentially spaced and extending between the B side displaceable half surface of the sprue flange (substantially located within the plane of the molded disk) and extending substantially downstream to the juncture with the ejector pin surface of the mold. Increased resistance to plastic deformation by the ejector pin prevents the ejector pin from tearing through the still-hot plastic while stripping the sprue off undercuts, yet avoids certain geometries of the ribs which also cause flow disturbances and unacceptable molded-in stresses during melt injection of the optical disk.

REFERENCES:
patent: 2306316 (1939-04-01), Marsh
patent: 4069003 (1978-01-01), Cecchi
patent: 4466934 (1984-08-01), Cane et al.
patent: 4738613 (1988-04-01), Eichlseder
patent: 4880587 (1989-11-01), Eichlseder
patent: 5018962 (1991-05-01), Kitamura et al.
patent: 5068065 (1991-11-01), Maus
patent: 5098281 (1992-03-01), Kitamura

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