MODULE FORMING PART OF A STATIC MIXER ARRANGEMENT FOR A PLASTICALLY FLOWABLE MATERIAL TO BE MIXED HAVING A CRITICAL DWELL TIME

摘要

A module is claimed for location in a housing(12) of a static mixer(2) used to process flowable plastic material with a critical dwell time. The module(3) comprises a tubular collar(30) with internal mixing bars(y,31b,32a,32b) inclined toward the main axis (20) of the housing and crossing each other on a straight lie(40) perpendicular to the long axis. Material is guided by the inner wall of the collar(30) on which the base(35) of each mandrel-like mixing bar is attached. The free end(36) of each mixing bar faces the direction of material movement(5) leaving a chamber(6) between itself and the wall. A mixer incorporating the module is claimed in which the crossing lines of the mixing bars(31a,31b,32a,32b) of two adjacent modules(3) run transverse to each other, preferably at 90 degrees to each other. Plant for processing flowable rigid polyvinylchloride(PVC) or other dwell time critical materials comprises a screw extruder with a die and a static mixer(2) with the claimed module(3) between them. A use of one form of the mixer(2) for processing polymers with critical dwell times, especially rigid PVC or rubber.