B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/732
B29C 47/64 (2006.01)
Patent
CA 1059718
ADVANCING AND WORKING THERMOPLASTIC MATERIALS Abstract of the Disclosure A typical compression relief design extruder screw having a helical flight for advancing and working a thermoplastic material is modified to shorten the feed and compression sections and to include a plurality of force- producing components in at least the compression section of the screw such that at least some portion of the components in any one turn of the flight lie in one plane essentially normal to the axis of rotation of the screw and such that the walls of the flight are uninterrupted. This arrangement controls the location of the rupturing or fragmenting of what is referred to as the solid bed and controls the manner in which it is fragmented to provide an extrudate at the die and of the extruder which has a constant temperature which is uniform throughout each successive section of the thermo- plastic material at the die end. Further, corresponding portions of the successive sections of the thermoplastic material at the die end are caused to have substantially identical time temperature profiles which is particularly advantageous when extruding expandable insulation in minimiz- ing amplitude of variation in the coaxial capacitance and the diameter of the insulated conductor.
240443
Na
Western Electric Company Incorporated
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