Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Patent
1978-05-30
1981-03-10
Thurlow, Jeffery R.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Shaping against forming surface
264537, 366 89, 425208, B29F 102
Patent
active
042553792
ABSTRACT:
An injection molding screw for use in processing heat sensitive polymeric materials and a process for plasticating such materials. The screw has an inlet end, a discharge end, means for mounting a backflow valve on the discharge end, and at least one section which applies high shear and high compression to the polymeric material and controls the material flow rate. A flighted screw section is disposed between the high shear and high compression section and the discharge end; that screw section includes means for decompressing the polymeric material and pumping it to the discharge end of the screw in the decompressed state at a rate at least equal to the pumping rate of the zone of high shear and high compression.
REFERENCES:
patent: 2990579 (1961-07-01), Hendry
patent: 3560605 (1971-02-01), Siggel et al.
patent: 3664795 (1972-05-01), Heinz et al.
patent: 3737151 (1973-06-01), Schaeffer
patent: 3868093 (1975-02-01), Sokolow
patent: 3954366 (1976-05-01), Fields
New Castle Industries, Inc.
Thurlow Jeffery R.
Yeager Robert D.
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