Stabilization of film casting by an encapsulation extrusion method

Joo Sung Lee, Hyun Wook Jung, Jae Chun Hyun

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

A film casting simulation has been used to demonstrate why the encapsulation extrusion coating process is so effective industrially in enhancing the stability of the extrusion coating of low-melt-strength polymers. In the present study, it is particularly intended to explain theoretically why and how the co-extrusion of high-melt -strength polymers like low-density polyethylene (LDPE)-attached at the periphery using encapsulation dies-dramatically improves the film coating process of low-melt-strength polymers like high-density polyethylene (HDPE). The undesirable neck-in and draw resonance phenomena frequently occurring in the extrusion coating of HDPE are shown in this study to be due to the fact that lower axial tension in the HDPE film rendered by its low melt strength leads to process instabilities. High melt strength LDPE will then increase the film tension when externally-attached, and as a result improves the stability of HDPE extrusion coating.

Original languageEnglish
Pages (from-to)109-115
Number of pages7
JournalJournal of Non-Newtonian Fluid Mechanics
Volume117
Issue number2-3
DOIs
Publication statusPublished - 2004 Feb 20

Keywords

  • Draw resonance
  • Encapsulation dies
  • Extrusion film coating
  • Film casting
  • Film thickness
  • Film width
  • High-density polyethylene (HDPE)
  • Low-density polyethylene (LDPE)
  • Neck-in
  • Stability

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering
  • Applied Mathematics

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