Agitating – Rubber or heavy plastic working – Stirrer is through-pass screw conveyor
Patent
1987-02-17
1988-02-09
Jenkins, Robert W.
Agitating
Rubber or heavy plastic working
Stirrer is through-pass screw conveyor
366319, 425207, B29B 106
Patent
active
047238470
ABSTRACT:
This invention relates to apparatus for continuously varying the pressure within a screw channel of a plasticating machine by way of a variable restriction in the screw channel. The apparatus includes a cylindrical barrel, a shaft rotatable within said barrel having a substantially circular cross-section and a longitudinal axis for rotation concentric with the barrel. The shaft is provided with a helical screw channel which is defined between successive turns of at least one helical flight integrally formed with the shaft. At least one radially movable first member is disposed at a right angle to said axis within the channel at a location along the axis and is located within the channel at a location along the axis at which the material being processed is substantially melted. A reciprocatively movable second member is disposed within a cylindrical bore through said shaft along the axis of rotation, the second member having a conical end portion which cooperates with an inner end of said first member such that said first member is movable in a radially inward or outward direction in response to the reciprocating movement of the second member. The inward or outward location of the first member provides a continuously variable restriction in the screw channel which increases or decreases pressure in an upstream direction within the channel.
REFERENCES:
patent: 3856278 (1974-12-01), Eisenmann
patent: 3924842 (1975-12-01), Klein
patent: 4213710 (1980-07-01), Hold
patent: 4387997 (1983-06-01), Klein
patent: 4444507 (1984-04-01), Dray
patent: 4491417 (1985-01-01), Hold
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