Viscoelastic simulation of film casting process for a polymer melt

Naoki Satoh, Hideki Tomiyama, Toshihisa Kajiwara

Research output: Contribution to journalArticle

61 Citations (Scopus)

Abstract

Numerical simulations of the film casting process were performed using a finite element method for Newtonian and viscoelastic fluids. We simplified the governing equations by the assumption that the stress and velocity gradients in the thickness direction were negligible, and obtained the film thickness and mean value of stress and velocity components in the thickness direction as variables. Viscoelasticity was described by the Larson model with multiple relaxation times. Non-isothermal conditions were considered by applying the time-temperature superposition law. The simulation results for the several kinds of commercial low-density polyethylenes were compared to the experimental data for a laboratory-scale process at 190°C and a commercial-scale process at 310°C. The film width and film thickness distribution at chill roll, and the change of film width were in good agreement for the laboratory-scale process, but the agreement for the commercial-scale process was not as good. In the simulation of the commercial-scale process at high temperature, the value predicted by the use of the viscoelasticity for the original pellet showed poor agreement owing to the change of viscoelasticity in the process. The agreement was improved by the use of the viscoelasticity for the processed resin, which was changed from the original one. Next, viscoelastic effects on neck-in and edge bead phenomena were investigated. The neck-in and edge bead phenomena were considered to be affected by both the uniaxial elongational viscosity and planar elongational viscosity.

Original languageEnglish
Pages (from-to)1564-1579
Number of pages16
JournalPolymer Engineering and Science
Volume41
Issue number9
DOIs
Publication statusPublished - Sep 1 2001
Externally publishedYes

Fingerprint

Polymer melts
Viscoelasticity
Casting
Film thickness
Viscosity
Low density polyethylenes
Polyethylene
Relaxation time
Resins
Finite element method
Temperature
Fluids
Computer simulation
Direction compound

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Polymers and Plastics
  • Materials Chemistry

Cite this

Viscoelastic simulation of film casting process for a polymer melt. / Satoh, Naoki; Tomiyama, Hideki; Kajiwara, Toshihisa.

In: Polymer Engineering and Science, Vol. 41, No. 9, 01.09.2001, p. 1564-1579.

Research output: Contribution to journalArticle

Satoh, Naoki ; Tomiyama, Hideki ; Kajiwara, Toshihisa. / Viscoelastic simulation of film casting process for a polymer melt. In: Polymer Engineering and Science. 2001 ; Vol. 41, No. 9. pp. 1564-1579.
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