Sprue gate for injection molding of plastic articles

Details Sprue gate for injection molding of plastic articles Sprue gate for injection molding of plastic articles

1980-07-29

1981-11-10

Flint, Jr., J. Howard

Static molds

Including static filling means in contact with mold cavity

Means includes single material inlet communicating with...

425573, B29F 100

Patent

active

042993725

ABSTRACT:
The invention contemplates a sprue-gate configuration embodied in one of the cavity-defining parts of a multiple-part mold for injection molding of plastic articles. At the gate region of sprue discharge into the cavity, the sprue converges into communication with a cluster of restricted-gate orifices which are in closely spaced, angularly distributed relation about the generally central axis of the sprue. The combined area of the restricted-gate orifices may be less than the area of a conventional single-orifice gate serving a cavity of the same size.

REFERENCES:
patent: 2431349 (1947-11-01), Stacy
patent: 2799435 (1957-07-01), Abplanalp
patent: 2878517 (1959-03-01), Cramer
patent: 2890615 (1959-06-01), Lefebvre
patent: 3568973 (1971-03-01), Rau et al.
patent: 3764248 (1973-10-01), Hall

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