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 language | English |
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| Title of host publication | Proceedings of the 13th international congress on rheology : Cambridge, United Kingdom, August 20-25, 2000 |
| Place of Publication | Glasgow |
| Publisher | British Society of Rheology |
| Pages | 3-222-3-224 |
| ISBN (Print) | 0-9538904-2-2 |
| Publication status | Published - 2000 |
| Event | XIIIth International Congress on Rheology - Cambridge, United Kingdom Duration: 20 Aug 2000 → 25 Aug 2000 |
Conference
| Conference | XIIIth International Congress on Rheology |
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| Country/Territory | United Kingdom |
| City | Cambridge |
| Period | 20/08/00 → 25/08/00 |