Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Positioning of a mold part to form a cavity or controlling...
Patent
1988-12-02
1991-04-16
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Positioning of a mold part to form a cavity or controlling...
2643281, 425149, 425150, 425167, 425590, B29C 4580
Patent
active
050080520
ABSTRACT:
A mold clamping pressure control method for injection compression molding through adjustment of the oil pressure in the mold clamping cylinder by the mold clamping cylinder control valve, wherein a resin temperature in the mold is detected by a resin temperature sensor, and detected values thereof are converted by a converter into electric signals, which are in turn compared with a series of the preset pressure changeover temperature setting values to output pressure changeover signals whenever the detected values correspond to the preset values. The pressure changeover signal selects any of a series of the preset pressure setting values to output the valve opening-shutting directing signals converted into a certain valve opening-shutting amount, thereby to control the opening-shutting amounts of the mold clamping pressure control valve.
REFERENCES:
patent: 4364878 (1982-12-01), Laliberte et al.
Heitbrink Jill L.
Toshiba Machine Co. Ltd.
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