B - Operations – Transporting – 29 – F
Patent
B - Operations, Transporting
29
F
18/734
B29F 3/06 (1980.01) B29B 1/06 (1980.01)
Patent
CA 1041718
IMPROVED METHOD AND APPARATUS FOR EXTRUDING MELTED PLASTIC MIXTURES ABSTRACT OF THE DISCLOSURE An improved method and apparatus for extruding plastic materials provides for processing a mixture of plastic particles, additives, dyes, and the like by means of an extruder screw to form a melted mass which is moved in a helically-directed stream in a confined space. At a predetermined point, flow-diverting means in said confined space abruptly changes the flow pattern. Portions of the helically-directed melted mixture advanced by the extruder screw and coming into contact with the flow-diverting means, undergo a contin- uous shearing action and sheared-away portions of the melted material are constantly turned over upon themselves and forced through restricted passage ways of short axial length in a highly turbulent flow pattern. After leaving the restricted passageways, the melted material again moves in a helical path flow. Turbulency thus induced at one or more points in the flow line brings together melted and unmelted particles more effectively and rapidly, and there is further accomplished an improved mixing together of the melted mixture and the additives and other components.
205526
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