将振动场引入聚合物塑化挤出的全过程,建立了振动挤出机的聚合物动态解析熔融模型.振动场的引入使挤出机的熔融塑化能力得到了很大的提高,熔融段的长度随着振动频率和振幅的增大而减少.在该模型中,随着熔融过程的进行,熔体的厚度缓慢增加,而固体床缓慢减少,直到聚合物熔体填满整个螺槽横截面;在稳定情况下,熔融段的长度不变,聚合物颗粒进入料筒的速度与挤出机的熔融速度以及产量相等.但是,当熔融段的长度达到某一稳定值后,再增大振幅或频率,熔融段的长度不再发生明显的变化.用该模型能很好地预测振动挤出机的成型参数,得到优化条件.将计算值与实验值比较验证了各振动参数(振幅和频率)对振动挤出机塑化熔融能力的影响.
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