PLASTICIZING SECTIONS OF COLD FEED RUBBER EXTRUDERS

摘要

An extruder with a screw rotatably mounted and driven to coact with a barrel. The extruder comprising an inlet, a compression section, a plasticizing section and an exit-section, the plasticizing section embodying a Transfermix geometry and having the generic feature that following the compression-section, a helical groove in the screw varies in cross-section from full area to zero area and in a substantially corresponding length of the barrel the cross-section of an opposite-handed helical groove varies from zero area to full area, whereby in operation the flowing material is transferred from the screw to the barrel while being mixed and plasticized. The screw outside of the extending substantially to the bottom of the helical groove, and the said barrel at the position of the cut having joined with it so as to be immobile relative to it a set of flow interrupters, substantially equally spaced around its circumference, and extending substantially to the bottom of the helical groove the flow interrupters loosely fitting into the cuts in the screw.