Plastic and nonmetallic article shaping or treating: processes – Miscellaneous
Patent
1976-12-14
1978-08-15
Thurlow, Jeffery R.
Plastic and nonmetallic article shaping or treating: processes
Miscellaneous
366 79, 366 83, 366 87, 264 459, 264 461, 264 54, 264176R, B29B 106
Patent
active
041072600
ABSTRACT:
Methods are provided for processing expandable thermoplastic materials with a typical compression relief design extruder screw having a helical flight for advancing and working a thermoplastic material. The screw 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 a die end of the extruder which has a constant temperature and which is uniform throughout each successive section of the thermoplastic material. 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 minimizing amplitude of variation in the coaxial capacitance and the diameter of the insulated conductor.
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Somers E. W.
Thurlow Jeffery R.
Western Electric Company Inc.
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