RIM机混合器混合物料的平均条纹厚度

MEAN STRIATION THICKNESS OF MIXTURES IN MIXER OF RIM MACHINE

混合物料的平均条纹厚度可作为衡量反应注射成型机碰撞式混合器混合效果的定量指标,导出了混合物料离开混合室及其后继流道的平均条纹厚度关联式,δ_0=10^(-5)a(1.361b^4-36.75b^3+501.6b^2-3825.0b+29730.0),δ=integral from a=0 to aδh（δ）dδ。当2000≤b≤20000时,前者的相对误差小于0.32％。为了获得较小的δ_0和δ值,混合室进料喷嘴直径应小,并适当增大进料组分压力;适当减小后继流道的直径和增大其长度,或在后继流道中设置静态混合器和在其后连接后继混合器。

The mean striation thickness of mixture was taken as a measure of the mixing effect in the impingement mixer of a reaction injection molding ( RIM) machine. The correlations for the mean striation thicknesses of the mixtures leaving the mixing chamber and the post-runner were obtained as: where the relative error of the former was less than 0.32%when 2000≤b≤20000. In order to decrease and , a number of approaches were employed such as reducing the diameter of the feeding nozzle , enhancing the feeding pressure, increasing the L /D ratio of the post - runner, and placing a static mixer inside the post -runner or attaching a post -mixer to it .