Plasticating apparatus and screw therefor

Details Plasticating apparatus and screw therefor Plasticating apparatus and screw therefor

1998-04-17

1999-10-12

Pyon, Harold

Plastic article or earthenware shaping or treating: apparatus

With separate and distinct upstream agitating or kneading means

Serially arranged chambers each housing a kneading or mixing...

26421123, 366 81, 366 89, 366322, 366323, 425208, B29C 4760, B29C 4764

Patent

active

059651733

ABSTRACT:
Plasticating apparatus includes a barrel having an inlet for the introduction of resinous material and an outlet for the discharge of plasticated molten extrudate, along with a screw rotatably mounted within the barrel and in communication with the inlet and outlet for receiving resinous material, plasticating the resinous material, and discharging plasticated molten extrudate. The screw includes a helical flight with an outside diameter sized rotatably engaging an inside surface of the barrel and further, a helical valley disposed between flight lands of the helical flight within a transition section includes two root diameters, namely a rear root diameter and a forward root diameter, with the rear root diameter being larger than the forward root diameter proximate the inlet. In addition, a metering section is provided with special infeed and outfeed passages.

REFERENCES:
patent: 3788614 (1974-01-01), Gregory
patent: 4007922 (1977-02-01), Tamura
patent: 4015832 (1977-04-01), Kruder
patent: 4173417 (1979-11-01), Kruder
patent: 4277182 (1981-07-01), Kruder
patent: 4310484 (1982-01-01), Blakeslee, III
patent: 4896969 (1990-01-01), Dray
patent: 5599097 (1997-02-01), Christie

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