Effect of processing on fiber orientation in simple injection moldings

R. S. Bay, C. L. Tucker, R. B. Davis

Research output: Contribution to journalConference articlepeer-review


These experiments deal with relatively simple mold geometries, a rectangular strip and a center gated disk, because they are the easiest cases to simulate. Working with simple geometry parts allows more time and effort to be spent in choosing constitutive equations and boundary conditions, which in turn will allow more accurate quantitative results. Once it becomes possible to accurately predict fiber orientation in simple parts, the appropriate constitutive equations and boundary conditions can be used by simulations capable of handling more complex geometries. The results have several implications for simulations. The most important is that the flow field must be known in three dimensions since the orientation field varies across the thickness of the part. The transversely-oriented core in the disks is created by in-plane stretching as the polymer flows radially away from the gate. The flow-aligned shell layer is formed by shearing across the part thickness, while the skin layer probably contains material that passed through the fountain region at the flow front and froze rapidly on the mold wall.

Original languageEnglish (US)
Pages (from-to)539-542
Number of pages4
JournalAnnual Technical Conference - Society of Plastics Engineers
StatePublished - 1989
EventANTEC 89 - 47th Annual Technical Conference of SPE - New York, NY, USA
Duration: May 1 1989May 4 1989

ASJC Scopus subject areas

  • Engineering(all)


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