Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Patent
1990-04-03
1991-03-26
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Shaping against forming surface
26432817, 425208, 425586, 425587, B29C 4552
Patent
active
050027174
ABSTRACT:
A method controlling the injection of a molten resin through an in-line screw type injection molding machine. The molding machine is equipped with a check ring for permitting the injection of the molten resin by an advancement of the screw and also for preventing the molten resin from flowing backward. According to the method, the screw is rotated in the normal direction to knead and plasticize a resin material and further to feed the resultant molten resin to the free end portion of the screw. The screw then retracts to meter and store a predetermined quantity of the molten resin adjacent to the free end portion of the screw. The screw is next rotated in the reverse direction to pressure of the molten resin on the rear side of the check ring lower than that of the molten resin thus metered and stored on the front side of the check ring. The screw retracts to reduce the pressure of the resin on the front side of the check ring, thereby performing a decompression stroke. The screw finally advances to inject the molten resin into a mold.
REFERENCES:
patent: 4767306 (1988-08-01), Kawaguchi et al.
patent: 4879077 (1989-11-01), Shimizu et al.
patent: 4966539 (1990-10-01), Pena
Heitbrink Jill L.
Toyo Machinery & Metal Co., Ltd.
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