Method of metering molding compound and a metering system for ca

Details Method of metering molding compound and a metering system for ca Method of metering molding compound and a metering system for ca

1992-09-04

1993-08-24

Shaver, Kevin P.

Dispensing

Processes of dispensing

222 55, 222 63, 222262, 222334, 264 403, 425145, B29F 102

Patent

active

052381471

ABSTRACT:
A molding compound metering system meters a molding compound in supplying the molding compound from a molding compound stocker into the injection chamber of an injection barrel by detecting the backward stroke of the injection plunger of an injection cylinder, axially slidably fitted in the injection chamber and detecting the pressure of the molding compound in the injection chamber of the injection barrel. When the injection plunger is moved backward by the pressure of the molding compound supplied into the injection chamber, the discharge of the working fluid from the back working chamber of the injection cylinder is regulated to apply back pressure to the injection plunger by an adjustable-pressure relief valve, and a regulated pressure is applied to the front working chamber of the injection cylinder. Thus, the adjustable-pressure relief valve is able to regulate the back pressure in a relatively high pressure range and, consequently, the back pressure can be accurately regulated to enhance the reliability of the metering operation.

REFERENCES:
patent: 3797808 (1974-03-01), Ma et al.
patent: 3889849 (1975-06-01), Chandler, Jr.
patent: 4019845 (1977-04-01), Birkhofer et al.
patent: 4545504 (1985-10-01), Fabel et al.
patent: 4579515 (1986-04-01), Kawaguchi et al.

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