Patent
In-line rheometer device and method
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TLDR
In this article, a system and method for measuring viscosity, melt flow index (MFI), and melt volume rate (MVR) of a polymer melt in real-time during an extrusion process to provide quick and accurate feedback for process control.Abstract:
A system and method for measuring viscosity, melt flow index (MFI), and melt volume rate (MVR) of a polymer melt in real-time during an extrusion process to provide quick and accurate feedback for process control. The system includes a polymer processing rate sensor ( 36 ), a polymer melt temperature sensor ( 30 ), an extruder pressure sensor ( 32 ), and a die head temperature sensor ( 34 ) for taking in-line measurements during the extrusion process. The in-line measurements are made on the main process stream of the polymer melt, with the determination of viscosity, MFI, and MVR based on these measured values and those obtained during a calibration run with polymers having known properties. The invention can be used in any polymer compounding and extrusion process utilizing die opening with any constant geometry for monitoring quality and providing feedback for process control.read more
Citations
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References
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Patent
Viscosity-modified lactide polymer composition and process for manufacture thereof
Patrick Richard Gruber,Jeffrey John Kolstad,David R. Witzke,Hartmann Mark Henry,Andrea Lee Brosch +4 more
TL;DR: In this paper, a polylactide polymer with improved extensional viscosity and methods of making the same are disclosed, which is prepared by providing in the composition poly-lactides polymer molecules which have been modified, relative to linear non-substituted poly lactide, to provide increased molecular interaction among poly-layer backbone chains in the composite.
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On-line rheological measurements
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TL;DR: In this paper, a novel method and apparatus for measuring elongational viscosity were disclosed, in which in a hyperbolic or semi-hyperbolic die geometry with lubricated flow, the length of a fluid can be obtained from pressure drop--flow rate data.
Patent
On-line rheometer device
George Frederick Fischer,Galina D. Georgieva,Joseph Maria Henri Janssen,Yegang Lin,Safwat E. Tadros,Mahari Tjahjadi +5 more
TL;DR: In this article, a system for providing process control information, such as viscosity, concerning a polymer melt, comprises a means containing a polymer melted under pressure; means for diverting a stream of the polymer melt directly from said containing means to and through an orifice of predetermined geometrical shape wherein the flow of said diverted portion to andthrough said orifice is unobstructed and directly dependent on the pressure of said main polymer melt wherein the cross sectional area is sized to permit the flow through the orifice, therethrough absence additional independent means acting on said diverted melt