An investigation of flow mark surface defects in injection molding of polymer melts

A.M. Grillet, A.C.B. Bogaerds, M.J.H. Bulters, G.W.M. Peters, F.P.T. Baaijens

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Abstract

Flow instabilities during injection molding can result in surface defects on polymer parts. In filled polypropylene systems, the regular dull surface of finished parts is broken by periodic shiny bands perpendicular to the flow direction. Such bands are referred to as flow marks, tiger stripes or ice lines. One mechanism which has been proposed to explain the surface defects is a flow instability at the fountain flow during mold filling. Finite element simulations of a model injection molding flow is used to more closely examine this proposed mechanism. The most unstable eigenmode is a swirling flow near the free surface which is in qual. agreement with the exptl. obsd. flow instability
Original languageEnglish
Title of host publicationProceedings of the 13th international congress on rheology : Cambridge, United Kingdom, August 20-25, 2000
Place of PublicationGlasgow
PublisherBritish Society of Rheology
Pages3-222-3-224
ISBN (Print)0-9538904-2-2
Publication statusPublished - 2000
EventXIIIth International Congress on Rheology - Cambridge, United Kingdom
Duration: 20 Aug 200025 Aug 2000

Conference

ConferenceXIIIth International Congress on Rheology
Country/TerritoryUnited Kingdom
CityCambridge
Period20/08/0025/08/00

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