A study of the entry-region length of circular extrusion dies

J. Z. Liang, X. L. Sun, Chak Yin Tang, G. J. Tang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

1 Citation (Scopus)


The flow properties of a visco-elastic fluid in the entry region of a circular die in the extrusion process have been investigated. Using the proposed approach, the time required for the fully developed flow of a visco-elastic fluid can be predicted. It has been found that the fluid flow will become fully developed when the residence time tRis seven tunes the relaxation time τ. On the basis of the results, an equation for calculating the entry-region length of circular dies has been derived, and the entry-region length of two rubber compounds in capillary extrusion has been determined, the results showing that the entry-region length is about 1 ∼ 2 times the die diameter.
Original languageEnglish
Pages (from-to)223-226
Number of pages4
JournalJournal of Materials Processing Technology
Issue number1-3
Publication statusPublished - 1 Jan 1998


  • Circular extrusion dies
  • Die diameter
  • Entry-region length
  • Visco-elastic fluid

ASJC Scopus subject areas

  • Ceramics and Composites
  • Computer Science Applications
  • Metals and Alloys
  • Industrial and Manufacturing Engineering


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