The governing rheological property for extrusion drawing in film-casting process is proposed in this study. The experiment of film-casting process using the high-pressure process low-density polyethylene (LDPE) was performed. The non-isothermal viscoelastic simulation of the film casting experiment was also carried out to explain the experimental results. Film width reduction phenomenon in an air gap, so-called neck-in behavior, was investigated by using the simulation of the LDPE and the model fluids exhibiting specific viscoelasticity. The neck-in phenomenon was also examined using theoretical model based on force balance and deformation type of a film. As a result, the neck-in normalized by the air gap was in good correlation with the ratio of planar to uniaxial elongational viscosity rather than the strain hardening nature of uniaxial elongational viscosity.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics