Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting
Patent
1995-05-26
1996-09-17
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
26421123, 264349, 366 762, B29B 762
Patent
active
055565816
ABSTRACT:
A method of injection molding whereby a polyethylene terephthalate (PET) without being predried or with having an irregular-shape is fed by a feed screw from a material feeder to an injection cylinder and plasticated by an injection screw. The rotational torque of the injection screw is detected in correspondence with the revolution speed of the feed screw during material feed, and a flection point of the rotational torque is determined. The feed screw is operated at a revolution speed within a range around the flection point of the rotational torque to provide a stable feed rate of the PET and to avoid difficulty in rotating the injection screw.
REFERENCES:
patent: 4247519 (1981-01-01), Sano
patent: 4286882 (1981-09-01), Schiesser
patent: 4578455 (1986-03-01), Pipper et al.
patent: 4670203 (1987-06-01), Chang
patent: 4818113 (1989-04-01), Patel
patent: 5261743 (1993-11-01), Moller
patent: 5385462 (1995-01-01), Kodama et al.
Anzai Kazuo
Aoki Hidemi
Takeuchi Yasuhiko
Heitbrink Jill L.
Nissei Plastic Industrial Co. Ltd.
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