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首页> 外文期刊>Journal of Applied Polymer Science >Melting process and mechanism for vibration induced single-screw extruder
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Melting process and mechanism for vibration induced single-screw extruder

机译：振动诱导单螺杆挤出机的熔融工艺及机理

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摘要

The effect of a vibration force field on the melting process of an extruder is studied. It is shown that the mechanism for melting differs from conventional theory. Experimental studies of melting of low-density polyethylene (LDPE) pellets in a vibration-induced single-screw (VISS) extruder show that melting is initiated on the inside of the barrel and the surface of screw. Models were developed that explain the melting mechanism in those regions. The melting at the surface of the screw is mainly initiated by frictional work on the pellets by the vibration and rotation of the screw. The melting action at the barrel is induced by a barrel temperature higher than the melting point and propagated by viscous dissipation heating of the melt film produced. The theory is supplemented by a calculation sample, which shows good agreement with experimental data obtained on a transparent barrel VISS (T-VISS) extruder and a half-open barrel VISS (H-VISS) extruder with LDPE. The results of the experiment and calculation sample indicate that the introduction of vibration-induced field can improve the melting capacity of extruder to a great extent. The present model enables the prediction of processing parameters for VISS extruders, from which the optimum operating conditions can be obtained. (c) 2007 Wiley Periodicals, Inc.
机译：研究了振动力场对挤出机熔融过程的影响。结果表明，熔化机理与常规理论不同。在振动诱导单螺杆（VISS）挤出机中熔化低密度聚乙烯（LDPE）粒料的实验研究表明，熔化是在机筒内部和螺杆表面开始的。建立了解释这些区域熔化机制的模型。螺杆表面上的熔化主要是由螺杆的振动和旋转引起的粒料上的摩擦功引起的。在机筒处的熔融作用是由高于熔点的机筒温度引起的，并通过所产生的熔融膜的粘性耗散加热而传播。通过计算样本对理论进行了补充，该计算样本与在透明桶式VISS（T-VISS）挤出机和带LDPE的半开放式桶式VISS（H-VISS）挤出机上获得的实验数据非常吻合。实验和计算样本的结果表明，引入振动场可以在很大程度上提高挤出机的熔融能力。本模型能够预测VISS挤出机的加工参数，从中可以获得最佳操作条件。 （c）2007年Wiley Periodicals，Inc.

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