混炼胶短口型挤出胀大行为的研究

EXTRUSION SWELL BEHAVIOR OF RUBBER COMPOUNDSIN SHORT DIES

当口型的长径比趋于零时,熔体入口收敛流动所引起的拉伸形变的弹性回复,是导致混炼胶短口型挤出胀大的主要原因。本研究提出了短口型挤出胀大的数学模型:B=(1+2 KS_R+2K^2S_R^2/8)0.25。式中K=0.5{4/8e(n+1)+[3(1-n)K_o)^(-1)},S_R=[2(B^6-1)]^(0.6)。用实验数据验证表明,计算值与实测值相当吻合。

It would be the main reason resulting in extrusion swell of rubber compounds in short dies that the melt elastic recovery of tensile deformation was produced in the converging flow at die entry when the die length/diameter ratio tended to zero. A mathematical model of extrudate swell in short dies was presented asiB= ( 1 + 2 KSR+ 2K2SR2/3 ) 0.26where, K= 0.5 { 4/ 3 e(n+ 1 ) + C 3 ( 1 -n )Ke ] -1 } , SR = [ 2(Be-l) ] 0.5. The model was verified through the experimental data and there was much correspondence between the calculations and values measured.