パリソン形成過程の予測
Calculation of Parison Formation Behavior from Laboratory Measurement
篠原正之・梶原稔尚・船津和守
Shinohara, Masayuki /Kajiwara, Toshihisa / Funatsu, Kazumori
In the extrusion blow molding process, it is desirable to predict the thickness distribution of finished product from the laboratory measurements of polymer properties. The thickness distribution of finished product depends on the parison formation and the parison formation process depends on the rheological properties of the polymer melt. The parison formation process was assumed as competition of uniaxial elongational flow and strain-recovery. A simple model was presented to calculate the parison formation process. The Giesekus model was selected as constitutive equation. The calculated dependences of parison length and thickness distribution on time were compared with experimental results of high molecular weight high density polyethylene with different relaxation spectra. Good agreement was obtained between theoretical and experimental data.
Key words: Blow molding / Parison formation / Giesekus model / Elastic recovery / Relaxation spectra