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
1989-01-25
1990-04-17
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...
26432811, 425149, 425150, 425590, B29C 4580
Patent
active
049178407
ABSTRACT:
A method and apparatus controlling an injection molding machine having a compression process. The velocity is controlled using a closed loop single or multi-step programmed velocity control method or a closed loop multi-step programmed slope velocity control method. Pressure may be controlled using a multi-step programmed pressure control method in which a pressure signal is detected from a detector set in the mold die or set in the clamping cylinder. The method of the present invention improves the accuracy and density of articles molded.
REFERENCES:
patent: 3857658 (1974-12-01), Muzsnay
patent: 4592713 (1986-06-01), Gutjahr
patent: 4594065 (1986-06-01), Langlois et al.
patent: 4599063 (1986-07-01), Gutjahr
Harada Susumu
Tanaka Hideo
Heitbrink Jill L.
Toshiba Machine Company, Ltd.
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