Acoustic Emission from Short Glass Fibre Reinforced Injection Moulded Parts with Weld Line

  • Bodo Brühl


When a thermoplastic polymer melt flow is partioned during the injection moulding process, a weld line is produced where the separated melt streams rejoin. This weld line may result in an area of weakness in injection moulded parts, specially in the case of fibre reinforced materials. The weld line is characterized by a change in the fibre orientation: the fibres are to a large extent oriented perpendicularly to the mould filling direction which coincides with the direction of load. An increase in strength intended to result from the addition of fibres may therefore not be fully achieved.


Acoustic Emission Acoustic Emission Signal Weld Line Acoustic Emission Event Acoustic Emission Energy 
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Copyright information

© Springer Science+Business Media New York 1991

Authors and Affiliations

  • Bodo Brühl
    • 1
  1. 1.Institute for Polymer Testing and Polymer ScienceUniversity of StuttgartGermany

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