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Squeeze Flow Rheology of Glass Mat Thermoplastic (GMT) in Large Tools and at High Closing Velocities

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Published/Copyright: June 5, 2013
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International Polymer Processing
From the journal International Polymer Processing Volume 17 Issue 2

Abstract

Rheological measurements on materials with fibre-like inhomogeneities will be significantly affected by sample size when the in-plane dimensions of the sample are comparable with the length of the fibres. In this paper, a 310 t hydraulic press has been modified for squeeze flow rheology studies so that large tools that will minimize the influence of sample size can be used in combination with high closing velocities. Isothermal squeeze flow rheology experiments of GMT have been performed for closing velocities up to 30 mm/s corresponding to maximum closing forces of 1000 kN. Successful power law fits of closing velocity versus closing force have been performed for the velocity interval. Four different analytical models have been fitted to the experimental data and the accuracy in these has been investigated. The force prediction of the biaxial extension model is acceptable for the major part of mould closure, but better fits during the last part of mould closure were obtained using an additive model incorporating both shear and extensions flow.

* Mail address: C. F. Vahlund, SICOMP AB, Box 271, SE-941126 Piteå, Schweden
Received: 2001-2-19
Accepted: 2002-2-13
Published Online: 2013-06-05
Published in Print: 2002-05-01

© 2002, Carl Hanser Verlag, Munich

Articles in the same Issue

  1. Editorial
  2. Thirteenth of a Series: The First and Best Industrial Polymer Rheologist — Melvin Mooney (1893–1968)
  3. Single Extrusion
  4. A New Method for Simulating the Conveying of Solid Pellets
  5. A 3D Numerical Study of Fluid Flow and Heat Transfer in a Single Screw Extruder
  6. Pressure/Throughput Behavior of a Single-screw Plasticising Unit in Consideration of Wall Slippage
  7. Computational Study of the Velocity Field in the Conveying Element of a Ko-kneader with CFD Method
  8. Reactive Extrusion
  9. Modification of Polyolefin with Maleic Anhydride/Styrene and Methyl Methacrylate/Styrene
  10. Fibers and Films
  11. Direct Measurement of Fiber Temperature in the Continuous Drawing Process of PET Fiber Heated by CO2 Laser Radiation
  12. Injection Molding
  13. Evaluation of a Model Describing the Advancing Flow Front in Injection Moulding
  14. Process Design for Reducing the Warpage in Thin-walled Injection Molding
  15. Composites
  16. Preferable Filament Diameter Ratios of Hybrid Yarn Components for Optimized Longfiber Reinforced Thermoplastics
  17. Squeeze Flow Rheology of Glass Mat Thermoplastic (GMT) in Large Tools and at High Closing Velocities
  18. Analysis of Heat Flu from Molten Polymers to Molds in Injection Molding Processes
https://doi.org/10.3139/217.1683

Articles in the same Issue

  1. Editorial
  2. Thirteenth of a Series: The First and Best Industrial Polymer Rheologist — Melvin Mooney (1893–1968)
  3. Single Extrusion
  4. A New Method for Simulating the Conveying of Solid Pellets
  5. A 3D Numerical Study of Fluid Flow and Heat Transfer in a Single Screw Extruder
  6. Pressure/Throughput Behavior of a Single-screw Plasticising Unit in Consideration of Wall Slippage
  7. Computational Study of the Velocity Field in the Conveying Element of a Ko-kneader with CFD Method
  8. Reactive Extrusion
  9. Modification of Polyolefin with Maleic Anhydride/Styrene and Methyl Methacrylate/Styrene
  10. Fibers and Films
  11. Direct Measurement of Fiber Temperature in the Continuous Drawing Process of PET Fiber Heated by CO2 Laser Radiation
  12. Injection Molding
  13. Evaluation of a Model Describing the Advancing Flow Front in Injection Moulding
  14. Process Design for Reducing the Warpage in Thin-walled Injection Molding
  15. Composites
  16. Preferable Filament Diameter Ratios of Hybrid Yarn Components for Optimized Longfiber Reinforced Thermoplastics
  17. Squeeze Flow Rheology of Glass Mat Thermoplastic (GMT) in Large Tools and at High Closing Velocities
  18. Analysis of Heat Flu from Molten Polymers to Molds in Injection Molding Processes
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