Disposable vent lines with reusable monitors for fabricating mol

Details Disposable vent lines with reusable monitors for fabricating mol Disposable vent lines with reusable monitors for fabricating mol

1992-07-20

1993-08-24

Heitbrink, Jill L.

Plastic article or earthenware shaping or treating: apparatus

Control means responsive to or actuated by means sensing or...

Feed control of material en route to shaping area

425169, 425546, 425190, 264 402, B29C 4534

Patent

active

052383814

ABSTRACT:
A molded workpiece is formed using a mold having an inner cavity, an injection port which communicates with the inner cavity for permitting molding material to be injected into the inner cavity, and at least one disposable vent line. The vent line has sidewalls which are substantially transparent to light and provides for venting gases from the inner cavity as molding material is injected into the cavity. A material injector is coupled to the injection port for injecting molding material into the inner cavity through the injection port. A removably sensor receives the disposable vent line for detecting when molding material has substantially filled the vent line and for generating a first signal indicating that the vent line is substantially filled. The sensor includes an infrared light emitting diode positioned adjacent to the vent line for radiating light toward the vent line, and a phototransistor for detecting light radiated through the transparent sidewalls of the vent line and for generating the first signal when no light is detected.

REFERENCES:
patent: 4626189 (1986-12-01), Hammer et al.
patent: 4631529 (1986-12-01), Zeitz
patent: 4649711 (1987-03-01), Sibley et al.
patent: 4782886 (1988-11-01), Uchida et al.
patent: 4874566 (1989-10-01), Heuschkel

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