硬质PVC低发泡管材的成型

The Extrusion Moulding of Low Expanded Foam Pipe of Rigid PVC Rigid PVC

本介绍了挤出法生产硬质PVC低发泡管材的成型工艺、设备、及产品性能,并对发泡机理、影响发泡成型的主要因素和原材料的品种规格,成型工艺条件(温度和压力),成型模头及冷却定型装置的设计和选用等,进行了讨论,在料筒温度为40～190℃,模头温度为145～185℃,压力9.81～39.2MPa,转速10～20n/min的工艺条件下,通过挤出、冷却、定型等工序,生产出密度为0.7～0.89g/cm^3,拉伸强度为14.72MPa,泡孔均匀,表面光洁平整的PVC低发泡管材。

The technology and equipment for the extrusion moulding of low expanded foam pipe of rigid PVC, and the properties of the product 5yore introduced. Discussions on the foaming mechanism, factors influencing the foaming moulding, the grade and specifications of the raw material, the technological condition (temperature and pressure), the designing and choosing of the moulding die and cooling sizing system were also made. Low expanded foam pipe of RPVC with homogeneous gas bubbles and smooth surface were produced and the technological conditions for the production were given.