Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting
Patent
1992-05-12
1993-03-16
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
2643281, 425145, 425149, B29C 4577
Patent
active
051941953
ABSTRACT:
A method of controlling an injection molding machine by use of nozzle resin pressures in which resin is directly controlled to thereby enable highly accurate control, and a conventional mold can be utilized as it is.
After metering a dose of resin, a resin pressure at the upstream side of a nozzle switching valve is detected while the nozzle switching valve is kept closed, and a pre-load is applied on the resin by controlling an injection cylinder. Subsequently, the nozzle switching valve is opened, and injection of the resin is performed, then applying a dwell pressure on the resin in the mold. During the injection and dwell pressure application steps, a resin pressure at the downstream side of the nozzle switching valve is detected, and the injection cylinder and the nozzle switching valve are controlled. In these steps, the resin to be filled is directly controlled, and therefore, the control can be carried out highly accurately. After the dwell pressure application step, the nozzle switching valve is closed. Then, the resin pressure at the upstream side of the nozzle switching valve is detected, and a back pressure is applied on the resin at the front end of a screw feeder by controlling the injection cylinder.
REFERENCES:
patent: 4952364 (1990-08-01), Matsuda et al.
Heitbrink Jill L.
Sumitomo Heavy Industrie's, Ltd.
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