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An In-line Melt Rheometer for Molten Plastics

Part 2: Dynamic Response Characteristics
  • B. I. Nelson , T. O. Broadhead , W. I. Patterson and J. M. Dealy
Published/Copyright: May 27, 2013
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International Polymer Processing
From the journal International Polymer Processing Volume 9 Issue 3

Abstract

An in-line rheometer designed for use as a sensor for closed-loop control of melt processing operations has been previously described. This instrument can measure the true viscosity of a melt stream over a range of shear rates. In order to evaluate its performance in processing applications the rheometer was mounted on a twin-screw extruder. A chemical degradation process was used to introduce changes in the molecular weight distribution, and thus the viscosity of a polypropylene resin, and these changes were monitored using the rheometer. For rapid replacement of melt in the zone of controlled shear in the rheometer, flow simulations indicated that it would be advantageous to operate the rheometer in a cyclic mode. A stochastic process identification technique based on a pseudorandom binary signal was used to determine the parameters of a first-order plus deadtime model of the process. In order to estimate the portion of the system response due to rheometer dynamics, residence time distributions were measured both with and without the rheometer present. It was found that the rheometer has a dead time of about 6's and a first order time constant of less than 15 s. The response of the new instrument is thus significantly faster than than that of melt process rheometers now commercially available.

*** Mail address: Prof. J. M. Dealy, Department of Chemical Engineering, McGill University, 3480 University St., Montreal, QC, Canada H3A 2A7.
Received: 1993-9-27
Accepted: 1994-2-1
Published Online: 2013-05-27
Published in Print: 1994-09-01

© 1994, Carl Hanser Verlag, Munich

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Tenth in a Series: Fried. Krupp: Pioneer Integrated Steel and Processing Machinery Manufacturer. Part 1. Essen, Magdeburg and Harburg (1812–1960)
  5. Internal Mixers
  6. Finite Element Modelling of Non-isothermal Viscometric Flows in Rubber Mixing
  7. Screw Extrusion and Mixing
  8. The Optimisation of Masterbatch Formulations for Use in Single Screw Machines
  9. Morphological Changes of a Polymer Blend into a Twin-Screw Extruder
  10. An In-line Melt Rheometer for Molten Plastics
  11. Selecting Continuous Compounding Equipment Based on Process Considerations
  12. Reactive Processing
  13. Peroxide Induced and Thermal Degradation of Polypropylene
  14. Reactive Blending of Polyamide 6 and Polycarbonate
  15. Modification of Polypropylene by Maleic Anhydride
  16. Fibers and Films
  17. Melt Strength Behaviour of Polypropylenes
  18. Molding
  19. Multilayer Injection Moulding
  20. Miscibility and Mechanical Properties of Poly(ether imide)/Liquid Crystalline Poly(ester imide) Blends
  21. The Effects of Recycling and Degradation on Parison Extrusion
  22. Modeling and Simulation of High Reynolds' Number Flows During Reaction Injection Mold Filling
https://doi.org/10.3139/217.940219

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Tenth in a Series: Fried. Krupp: Pioneer Integrated Steel and Processing Machinery Manufacturer. Part 1. Essen, Magdeburg and Harburg (1812–1960)
  5. Internal Mixers
  6. Finite Element Modelling of Non-isothermal Viscometric Flows in Rubber Mixing
  7. Screw Extrusion and Mixing
  8. The Optimisation of Masterbatch Formulations for Use in Single Screw Machines
  9. Morphological Changes of a Polymer Blend into a Twin-Screw Extruder
  10. An In-line Melt Rheometer for Molten Plastics
  11. Selecting Continuous Compounding Equipment Based on Process Considerations
  12. Reactive Processing
  13. Peroxide Induced and Thermal Degradation of Polypropylene
  14. Reactive Blending of Polyamide 6 and Polycarbonate
  15. Modification of Polypropylene by Maleic Anhydride
  16. Fibers and Films
  17. Melt Strength Behaviour of Polypropylenes
  18. Molding
  19. Multilayer Injection Moulding
  20. Miscibility and Mechanical Properties of Poly(ether imide)/Liquid Crystalline Poly(ester imide) Blends
  21. The Effects of Recycling and Degradation on Parison Extrusion
  22. Modeling and Simulation of High Reynolds' Number Flows During Reaction Injection Mold Filling
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