Method of extruding material through a twin-screw extruder havin

Details Method of extruding material through a twin-screw extruder havin Method of extruding material through a twin-screw extruder havin

1989-07-20

1990-06-19

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

26421121, 26421123, B29C 4700, B29C 4740

Patent

active

049351834

ABSTRACT:
A greatly improved twin screw extruder and method are disclosed which significantly reduce extruder wear through provision of separate, complemental, interfitted frustoconical screw and barrel sections adjacent the outlet end of the extruder barrel which create an even, bearing-type support for the rotating screws as material passes through the apparatus. In preferred forms, the screws are intermeshed along the majority of the extruder barrel, but diverge at the region of the final frustoconical screw sections and are received within respective complemental barrel sections; in this fashion the material being processed is split into juxtaposed, non-communicating streams, and thereby evenly flows around and supports the adjacent screw section to lessen the tendency of the screws to separate themselves and come into wearing contact with the surrounding barrel walls. The extruder can be used to process a wide variety of plant-derived materials, but is particularly useful for viscous substances (e.g., soy concentrates and isolates) which can be difficult to handle with mono-screw extruders.

REFERENCES:
patent: 3525124 (1970-08-01), Ocker

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