Agitating – Rubber or heavy plastic working – Stirrer is through-pass screw conveyor
Patent
1976-09-08
1978-07-25
Jenkins, Robert W.
Agitating
Rubber or heavy plastic working
Stirrer is through-pass screw conveyor
366319, 366323, B29B 106
Patent
active
041033531
ABSTRACT:
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 a die end of the extruder which has a constant temperature and 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.
REFERENCES:
patent: 2838794 (1958-06-01), Munger
patent: 3115674 (1963-12-01), Schrenk
patent: 3115675 (1963-12-01), Tedder
patent: 3239883 (1966-03-01), Ferrari
patent: 3251911 (1966-05-01), Hansen
patent: 3287477 (1966-11-01), Vesilind
patent: 3391051 (1968-07-01), Ehrenfreund
patent: 3486193 (1969-12-01), Gwinn
patent: 3487503 (1970-01-01), Barr
patent: 3497582 (1970-02-01), Pettersson
patent: 3530534 (1970-09-01), Pomper
patent: 3676034 (1972-07-01), Wendricks
patent: 3762693 (1973-10-01), DeBoo
patent: 3822867 (1974-07-01), Evans
Jenkins Robert W.
Somers E. W.
Western Electric Company Inc.
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