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Jetting and fibre degradation in injection moulding of glass-fibre reinforced polyamides

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Abstract

Injection-moulded glass fibre-reinforced polyamides with up to 50% by weight fibre content were examined for processing behaviour such as jetting and fibre degradation. Jetting was found to be a function of the ratio of the gate depth to mould-cavity depth, fibre length, fibre content and injection ram speed. Contrary to expectation, jetting occurred less frequently as the injection ram speed was increased. Major fibre degradation was experienced during the transport of the melt from the injection machine to the mould cavity. Further fibre degradation due to increases in injection back-pressure was comparatively small. Tensile strength was shown to be sensitive to variations in the fibre length distribution, whereas the elastic modulus remained unaffected.

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References

  1. K. Oda, J. L. White andE. S. Clark,Polym. Engng Sci. 16 (1976) 582.

    Google Scholar 

  2. J. A. Brydson, “Flow Properties of Polymer Melts” (ILIFFE Books, London, 1970).

    Google Scholar 

  3. Y. Chan, J. L. White andY. Oyanagi,J. Rheol. 22 (1978) 507.

    Google Scholar 

  4. R. J. Crowson andM. J. Folkes,Polym. Engng Sci. 20 (1980) 934.

    Google Scholar 

  5. W. H. Bowyer andM. G. Bader,J. Mater. Sci. 7 (1972) 1315.

    Google Scholar 

  6. J. Lunt, PhD thesis, University of Liverpool (1980).

  7. M. Akay andD. Barkley,J. Mater. Sci. 26 (1991) 2731.

    Google Scholar 

  8. Idem, Compos. Struct. 3 (1985) 269.

    Google Scholar 

  9. A. H. Cottrell, “The Mechanical Properties of Matter” (Wiley, New York, 1964).

    Google Scholar 

  10. R. S. Bailey, M. Davies andD. R. Moore, in “Composites Evaluation”, edited by J. Herriot (Butterworths, Guildford, 1987) pp. 87–95.

    Google Scholar 

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Authors and Affiliations

  1. Department of Mechanical and Industrial Engineering, University of Ulster at Jordanstown, BT37 OQB, Newtownabbey, County Antrim, UK

    M. Akay & D. Barkley

Authors
  1. M. Akay
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  2. D. Barkley
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Akay, M., Barkley, D. Jetting and fibre degradation in injection moulding of glass-fibre reinforced polyamides. J Mater Sci 27, 5831–5836 (1992). https://doi.org/10.1007/BF01119746

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  • DOI: https://doi.org/10.1007/BF01119746

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