Injection molding device with back pressure control of screw mov

Details Injection molding device with back pressure control of screw mov Injection molding device with back pressure control of screw mov

1973-05-22

1976-01-06

Reeves, Robert B.

Dispensing

With discharge assistant

Motor operated

222413, 425146, 425247, B29F 106

Patent

active

039306003

ABSTRACT:
A method of and apparatus for injection molding of materials such, for example, as thermoplastic resinous material, utilizing a rotatable and reciprocal screw extruder for plasticizing and injecting the material into a mold cavity, and wherein an injection piston in a cylinder is operatively connected to the plasticizing screw to push the screw forward to effect injection into a mold of plasticized material in front of the screw. A supply of fluid pressure is positively applied to the injection piston to provide a back pressure to act against the reaction caused by the rotation of the plasticizing screw, and this back pressure may be regulated to correspond with the rearward displacement, of the screw.

REFERENCES:
patent: 2950501 (1960-08-01), Horkenrider
patent: 3140332 (1964-07-01), Brown
patent: 3492700 (1970-03-01), Kornmayer
patent: 3538549 (1970-11-01), Hehl
patent: 3695800 (1972-10-01), Hutchinson
patent: 3721512 (1973-03-01), Ma

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