Plastic article or earthenware shaping or treating: apparatus – Control means responsive to or actuated by means sensing or... – Temperature control
Reexamination Certificate
2006-03-28
2006-03-28
Del Sole, Joseph S. (Department: 1722)
Plastic article or earthenware shaping or treating: apparatus
Control means responsive to or actuated by means sensing or...
Temperature control
C425S145000, C425S149000, C425S377000, C425S378100, C264S040100, C264S040400, C264S040600, C264S040700
Reexamination Certificate
active
07018191
ABSTRACT:
An extrusion control system that controls the cross section and viscosity during extrusion of even hard to control plastics like polyurethane. Cross section, A, is determined by measuring volumetric rate of deliver of melt through a gear pump V/t and the speed of the extrudate at a puller N/t. The cross-section area, A=(V/t)/(N/t), is controlled by controlling the puller speed. Pressure drop across the die, P, and the volume of melt delivered by the gear pump are measured and a term indicative of the viscosity of the melt is determined based on Vs=(KP)/V, Vs being the viscosity and K being a constant dependent on the size and shape of the die orifice. Viscosity variations are compensated by varying heat applied to the melt.
REFERENCES:
patent: 4209476 (1980-06-01), Harris
patent: 4272466 (1981-06-01), Harris
patent: 4290986 (1981-09-01), Koschmann
patent: 4448736 (1984-05-01), Emery et al.
patent: 4721589 (1988-01-01), Harris
patent: 4734922 (1988-03-01), Harris
patent: 4954719 (1990-09-01), Harris
patent: 5695789 (1997-12-01), Harris
patent: 5718852 (1998-02-01), Campbell et al.
patent: 5725814 (1998-03-01), Harris
patent: 6652785 (2003-11-01), Harris
patent: 6719935 (2004-04-01), Tunc
Harrel Incorporated,“Viscosity Control in Extrusion . . . The Viscontrol Process”, TDS-298.
Harrel Incorporated, The VT-60.0 Viscotruder, TDS-297.
Harrel Incorporated, “The Care and Feeding of Polyurethane Extrusion Lines”.
Del Sole Joseph S.
Gallagher & Kennedy P.A.
Harrel Incorporated
MacBlain Thomas D.
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