The effect of viscoelasticity on the extrusion drawing in film-casting process |
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Authors: | Seiji Shiromoto Yasushi Masutani Masaaki Tsutsubuchi Yoshiaki Togawa Toshihisa Kajiwara |
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Institution: | (1) Sumitomo Chemical Co., Ltd., 2-1 Kitasode, Sodegaura, Chiba 299-0295, Japan;(2) Department of Chemical Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan |
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Abstract: | 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. |
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Keywords: | |
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