Method and apparatus for testing mold vent orifices

Details Method and apparatus for testing mold vent orifices Method and apparatus for testing mold vent orifices

1974-12-06

1976-03-30

Queisser, Richard C.

Measuring and testing

With fluid pressure

Dimension, shape, or size

73 375, G01M 300

Patent

active

039465950

ABSTRACT:
In the injection molding of elongated thin walled articles, air within the mold escapes from the mold cavity through vent orifices in the cavity and in an elongated core positioned within the cavity. To determine whether critical mold venting is within desired tolerances, a relatively high pressure gas is applied to the vent orifice and pressure is allowed to decay by escape through the orifice. Time required for a predetermined magnitude of pressure drop is measured and employed as an indication of vent orifice acceptability.

REFERENCES:
patent: 2266566 (1941-12-01), Poole
patent: 2853874 (1958-09-01), Mennesson
patent: 2939314 (1960-06-01), Prince
patent: 3433055 (1969-03-01), Booy et al.
patent: 3508432 (1970-04-01), Marshall, Jr. et al.
patent: 3800586 (1974-04-01), Delatorre et al.

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