Pressure build‐up during the packing stage of injection molding

Tai‐Shung ‐S Chung*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

27 Scopus citations


A thorough study of an isothermal fluid motion within the mold cavity during the packing stage is presented. The fluid is considered Newtonian, and its compressible behavior is assumed to obey the Spencer‐Gilmore equation of state. Mathematical results indicate that the pressure built up during the packing stage is strongly dependent on the melt viscosity and the boundary of the cavity. The effects of pressure gradient and distribution, during this stage, on the shrinkage of the final products are also discussed.

Original languageEnglish (US)
Pages (from-to)772-777
Number of pages6
JournalPolymer Engineering & Science
Issue number12
StatePublished - Aug 1985
Externally publishedYes

ASJC Scopus subject areas

  • General Chemistry
  • Polymers and Plastics
  • Materials Chemistry


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