Plastic article or earthenware shaping or treating: apparatus – With separate and distinct upstream agitating or kneading means
Patent
1991-04-24
1993-04-06
Simmons, David A.
Plastic article or earthenware shaping or treating: apparatus
With separate and distinct upstream agitating or kneading means
4253781, B29C 4700
Patent
active
052002055
ABSTRACT:
Extruder barrel temperature control apparatus in the form of a plurality of axially spaced tubular shells positioned in end-to-end relationship on the outer surface of a tubular extruder barrel. Each of the shells includes individual resistance heater elements embedded in the shell wall for providing heat to maintain a desired shell temperature. Each shell includes two groups of outwardly extending cooling fins, each group axially spaced from the other, and each group of fins has an associated air blower positioned below the fins and supported by an outer casing surrounding the extruder barrel. The outer casing includes an internal shroud to confine the cooling air flow so it is directed over and along the cooling fins. The heating elements and the blower motors are connected with a suitable control system for providing and maintaining a desired temperature level at the barrel inner surface. Six such shells defining six respective heating and cooling zones are disclosed. A thermocouple is embedded in the walls of the respective shells for monitoring the shell wall temperature and to permit control adjustments to be made, as necessary to maintain a desired temperature level.
REFERENCES:
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patent: 3743252 (1973-07-01), Schott, Jr.
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patent: 4319871 (1982-03-01), McAlister
patent: 4721589 (1988-01-01), Harris
patent: 4758146 (1988-07-01), Piazzola
Griff, Alan L. Plastics Extrusion Technology, Reinhold Publishing Corporation, New York, N.Y.: 1962, pp. 11-14 & 192-193.
Surface Christopher P.
Wissmann Siegfried R.
Cincinnati Milacron Inc.
Matney, Jr. William J.
Simmons David A.
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