インフレーション成形の粘弾性解析
Viscoelastic Analysis of Tubular Film Blowing
篠原正之・梶原稔尚・船津和守
Shinohara, Masayuki / Kajiwara, Toshihisa / Funatsu, Kazumori
In this research, we investigated the dependence of stress anisotropy and bubble shape on Weissenberg number and degree of non-linearity at a fixed bubble radius and thickness in tubular film blowing. The process was analysed by the Maxwell model and Larson model. Conclusions were as follows. @ As the Weissenberg number increases at a fixed blow-up ratio and draw down ratio, the stress ratio at the freezeline increases and a neck in the bubble vanishes for the Maxwell model. A Stress could be calculated to realistic draw down ratio by introducing non-linear constitutive equations into the film blowing analysis. B As the non-linear parameter increases at a fixed blow-up ratio and draw down ratio, stress anisotropy increases and the length of neck increases.
Key words: Tubular film blowing / Viscoelasticity / Larson model