Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Viscosity
Patent
1993-03-11
1994-09-20
Williams, Hezron E.
Measuring and testing
Liquid analysis or analysis of the suspension of solids in a...
Viscosity
G01N 1108
Patent
active
053478525
ABSTRACT:
On-line rheological measurements are made utilizing a rheometer of the type in which a first metering pump delivers diverted melt from a process main stream to a capillary passage and a second metering pump returns the diverted melt from the capillary passage to the process main stream and the viscosity of the diverted melt is measured by controlling the rate of flow of the melt through the capillary passage to maintain constant the pressure drop between spaced apart locations along the capillary passage and measuring the temperature of the melt in the capillary passage. The measurements may be made while controlling the speed of the second metering pump independent of the speed of the first metering pump to maintain the pressure at the exit of the capillary passage essentially constant. A parallel flow passage has an inlet placed between the first metering pump and the entrance to the capillary passage, in close juxtaposition with the entrance and an outlet placed between the exit from the capillary passage and the second metering pump, and a valve in the parallel flow passage is operated so that diverted melt selectively is passed through the parallel flow passage to attain a relatively quick response and relatively short residence time of the diverted melt in the rheometer.
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On-Line Rheometer for Polymer melts bypass-Rheograph side Stream-Rheograph, Gottfert Werkstuff-Prufmaschinen GmbH.
Rheometrics, Inc.
Roskos Joseph W.
Williams Hezron E.
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