【摘要】 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．更多还原

【Abstract】 A dynamic analytic melting model in a vibration extruder is presented by introducing vibration field into the melting and extruding process of polymer material. The introduction of vibration field improves the melting and plastication capacity of extruder, and the melting section length decreases as the amplitude and the frequency increase. In the present model, as melting proceeds, the thickness of the melt gradually grows at the expense of the solid bed until eventually the melted material fills the entire cross-section of the screw channel; under the steady condition, the melting section length is unvaried, and the speed that the polymer pellet enters the barrel is equally to the melting rate, as well as the output. When the intensity of vibration arrives at an extremum, increasing the vibration parameters can not lead to a significant change of the melting section length. The processing parameters in the vibration extruders can be predicted by this model, and the optimum condition was obtained.更多还原