122 溶融損傷に及ぼすダイ出口端形状の影響(S34-1 複雑流体の流れとその応用(1),S34 複雑流体の流れとその応用)  [in Japanese] 122 Influence of die exit geometry on the melt fracture  [in Japanese]

The relationship between melt fracture and near wall instability was investigated at the die exit of capillary extrudate flow. The polymer was liner Polydimethylsiloxane. The flow at the die exit was observed for a diverging die, a long-straight die, and a short-straight die. In spiral fracture, polymer peeling appeared for the diverging die exit and the short-straight die exit. The long-straight die did not indicate the polymer peeling at the exit, but the particle-path visualization due to the dispersed micro spheres revealed a flow instability at the long-straight die exit.