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Injection Molding of Reinforced Thermosets

Fiber Orientation Observations and Flow calculation
  • R. Blanc , S. Philipon , M. Vincent , J. F. Agassant , H. Alglave , R. Müller und D. Froelich
Veröffentlicht/Copyright: 28. Februar 2022
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International Polymer Processing
Aus der Zeitschrift International Polymer Processing Band 2 Heft 1

Abstract

The orientation of glass fibers (initial length 20 mm) and the mold filling of reinforced unsaturated polyester compounds have been studied. Observations of the fiber orientation have been made in three molds where shear and elongational flows occur in variable ways. A part of the fibers are split and broken into filaments. Reinforcement can be more or less buckled. A thin skin layer without fibers is observed. The great thickness of a core region with an orientation perpendicular to the flow direction shows the importance of negative elongational flows. Efficiency of positive elongational flows to suppress buckling and to give a well flow aligned orientation is also observed. On the contrary the efficiency of shear flows is limited compared to elongational flows. The incidence of injection conditions on the pressure inside a rectangular plaque has been studied both experimentally and theoretically. Experimental difficulties due to the material heterogeneity leads to measure viscosity data of the uncured material on a special capillary rheometer and rheological kinetic data on a simplified compound. Numerical results are in good agreement with experimental measurements. For instance the effect of crosslinking which leads to a pressure rise at low flow rate or high mold temperature is well predicted.

* Mail address: Dr. J. F. Agassant, Ecole Nationale Supérieure des Mines de Paris, CEMEF, rue Claude Daunesse, Sophia-Antipolis, 06560 Valbonne, France

Aknowledgments

This study was supported by the French Ministere de II'ndustrie, by PSA Etudes et Recherches (France). Materials were supplied by CdF-Chimie Résines (France).

Notations

x, r

flow direction

y

thickness direction

P

pressure

Q

flow-rate

Tm

mold temperature

Tinj

BMC temperature in the nozzle of the injection machine

η

viscosity

f

initial viscosity

g

rheological kinetic term

gT

isothermal rheological kinetic

h

half thickness of the mold

hi

half thickness at the entrance of the mold

1

flow front position

γ ˙

shear rate

α

degree of cure

T

temperature

t

time

dt

time increment

u

flow direction velocity field component

v

transverse velocity field component

ρc

specific heat of BMC

kP

thermal conductivity of BMC

Km

thermal conductivity of the mold steel

References

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Published Online: 2022-02-28
Published in Print: 2022-02-28

© 1987 Walter de Gruyter GmbH, Berlin/Boston, Germany

Artikel in diesem Heft

  1. Contents
  2. Present and Future Trends in Polymer Blends Technology**
  3. A Dispersive Mixing Testing Apparatus
  4. Injection Molding of Reinforced Thermosets
  5. Rheological Characterization of Sulfuric Acid Solutions of Poly(p-phenyleneterephthalamide)
  6. Fiber Spinning with Molecular Models
  7. Gel-Permeation Chromatography as a Tool for the Real-Time-Estimation of the Chain length Distribution in a Polymerization Reactor
  8. Second Moment Specification of Complex States of Polymer Chain Orientation in Fabricated Plastic Parts
  9. Thermal and Crystallization Behaviour of Polyphenylene Sulfide in Engineering Polymer Blends with HDPE
  10. Contents
  11. Review Paper
  12. Present and Future Trends in Polymer Blends Technology
  13. Original Contributions
  14. A Dispersive Mixing Testing Apparatus
  15. Injection Molding of Reinforced Thermosets
  16. Rheological Characterization of Sulfuric Acid Solutions of Poly(p-phenyleneterephthalamide)
  17. Fiber Spinning with Molecular Models
  18. Gel-Permeation Chromatography as a Tool for the Real-Time-Estimation of the Chain length Distribution in a Polymerization Reactor
  19. Second Moment Specification of Complex States of Polymer Chain Orientation in Fabricated Plastic Parts
  20. Thermal and Crystallization Behaviour of Polyphenylene Sulfide in Engineering Polymer Blends with HDPE
https://doi.org/10.1515/ipp-1987-0014

Artikel in diesem Heft

  1. Contents
  2. Present and Future Trends in Polymer Blends Technology**
  3. A Dispersive Mixing Testing Apparatus
  4. Injection Molding of Reinforced Thermosets
  5. Rheological Characterization of Sulfuric Acid Solutions of Poly(p-phenyleneterephthalamide)
  6. Fiber Spinning with Molecular Models
  7. Gel-Permeation Chromatography as a Tool for the Real-Time-Estimation of the Chain length Distribution in a Polymerization Reactor
  8. Second Moment Specification of Complex States of Polymer Chain Orientation in Fabricated Plastic Parts
  9. Thermal and Crystallization Behaviour of Polyphenylene Sulfide in Engineering Polymer Blends with HDPE
  10. Contents
  11. Review Paper
  12. Present and Future Trends in Polymer Blends Technology
  13. Original Contributions
  14. A Dispersive Mixing Testing Apparatus
  15. Injection Molding of Reinforced Thermosets
  16. Rheological Characterization of Sulfuric Acid Solutions of Poly(p-phenyleneterephthalamide)
  17. Fiber Spinning with Molecular Models
  18. Gel-Permeation Chromatography as a Tool for the Real-Time-Estimation of the Chain length Distribution in a Polymerization Reactor
  19. Second Moment Specification of Complex States of Polymer Chain Orientation in Fabricated Plastic Parts
  20. Thermal and Crystallization Behaviour of Polyphenylene Sulfide in Engineering Polymer Blends with HDPE
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