Injection molding method

Details Injection molding method Injection molding method

1977-02-08

1978-12-05

Pavelko, Thomas P.

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

Flash or sprue removal type

264328, 264329, B29F 105

Patent

active

041286138

ABSTRACT:
An improved injection mold method includes interposing a gate between a mold chamber or cavity and a runner passageway. The cross sectional opening of the gate is non-circular in shape and may comprise a plurality of foliations. The non-circular shape of gate opening enables the provision of sufficient area to insure adequate filling and compacting of molding material in a mold chamber within a reasonable time interval and also avoids difficult problems such as drooling, stringing, and/or freeze-off or blocking of material-supply passageways.

REFERENCES:
patent: 2698464 (1955-01-01), Wilson
patent: 2773284 (1956-12-01), Kelly
patent: 2865050 (1958-12-01), Strauss
patent: 3013303 (1961-12-01), Amazon
patent: 3031722 (1962-05-01), Gits
patent: 3231938 (1966-02-01), Seymour
patent: 3358689 (1967-12-01), Higgins
patent: 3800027 (1974-03-01), Tsutsumi
patent: 3822856 (1974-07-01), Gellert
Injection Molding Theory And Practice, Rubin, Irvin, J. Wiley, N.Y., 1972. pp. 123 to 127.
Injection Molding, Modern Plastics Encyclopedia, Sep. 1965, pp. 725 & 726.

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