Injection mold

Details Injection mold Injection mold

1989-12-01

1991-02-05

Hoag, Willard E.

Plastic article or earthenware shaping or treating: apparatus

Means feeding fluent stock from plural sources to common...

425556, 425577, 425812, B29C 4516

Patent

active

049900773

ABSTRACT:
An injection mold which eliminates defects in the appearance of the molded product such as flow marks formed during the molding operation on those portions of the molded product adjacent molten resin injection gates. A fixed and a movable mold member are provided. An injection port for injecting molten resin into the mold cavity formed by the mold members is formed in the fixed mold member, while an opening communicating the mold cavity with the exterior is formed in the movable mold member at a position opposed to the injection port and spaced therefrom across the mold cavity. An insert member is inserted in the opening having a surface forming part of an inner surface of the mold cavity. The insert member has a size and shape such that gas in the mold cavity is discharged exteriorly from the mold via a fitting gap between said opening and the insert member.

REFERENCES:
patent: 2217661 (1940-10-01), Anderson
patent: 2227966 (1941-01-01), Emsley
patent: 4125246 (1978-11-01), Von Holdt
patent: 4374636 (1983-02-01), Holmes
patent: 4552328 (1985-11-01), Dutt et al.
Pye, R. G. W., Injection Mould Design, Iliffe Books, London (1971), pp. 101, 102, 180 and 181.
Randolph et al., Plastics Engineering Handbook, Reinhold, N.Y. (1966) pp. 400, 401 and 402.

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