PVC粉料在双螺杆挤出机上的加工特性

研究了PVC树脂在双螺杆上的挤出塑性特性,找出了输送量与混合时间、温度、摩擦力之间的函数关系。并发现聚合物的质量密度分布是沿着C型室内的压力按指数上升。粒子的固体输送特性,在啮合段形成的返向漏流速率是依靠螺杆的设计参数和质量密度。但是,升温的原因,80％是由于在C型室内的摩擦和阻尼热形成的。

Processability of PVC Powder in Twin Screw Extruder

Extrusion plastification behavior of poly(vinyl chloride)(PVC) in counter rotationg twin screw extruders was investigated. Functional relationship between conveying capacity and mixing time, temperature and friction was presented.It is found that the bulk density distribution is formed along the C shaped chamber and exponential pressure rise is generated.Solid particulate conveying characteristic is given by backwards leakage flow rate through intermeshing region and formulated as a conveying efficiency depending upon screw design parameters and bulk density distribution. Also, it has been clarified that over 80% of temperature rise is due to the frictional and viscous heat generation inside chambers.