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Weldlines in injection molded polypropylene : effect of filler shape

Par Conseil national de recherches du Canada

DOITrouver le DOI : https://doi.org/10.1177/073168449000900209
AuteurRechercher : ; Rechercher : ; Rechercher : ; Rechercher : 1
Affiliation
  1. Conseil national de recherches du Canada
FormatTexte, Article
Conférence42nd Annual Conference of the Society of the Plastics Industry, 1987
Résumé
Weldlines represent potentially fatal sources of weakness in injection molded thermoplastic parts. This is particularly true for filled and reinforced composi tions where usual remedies consisting in a modification of processing conditions such as increase of melt temperature, injection speed, and pressure do not always work. This paper deals with weldline strength of injection molded polypropylene containing spherical and irregularly shaped fillers (glass spheres, calcium carbonate), or reinforcements such as glass flakes and fibers, talc, and mica. Two types of weldline will be considered: weldlines formed when two melt streams meet head-on and those formed as a result of flow around an insert. It will be shown that the loss of strength is greatest in compositions reinforced with flakes and fibers. This is due to flow induced filler orientation in the weldline zone. Approaches to reduce the loss of strength which make use of known flow behavior of suspensions of fibers and flakes will be illustrated.
Date de publication
Maison d’éditionSage
Dans
  • Journal of Reinforced Plastics and Composites 9, nº 2 : 194–208.
Langueanglais
Publications évaluées par des pairsOui
Numéro du CNRCCNRC 33045
NRC-IMI91AP-31000-1196-G
Numéro NPARC23004508
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Identificateur de l’enregistrementfc2c6a87-f770-4cf6-8e0e-f71d26345e65
Enregistrement créé2018-11-09
Enregistrement modifié2020-03-17
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