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片材机组的生产工艺流程【图】

   片材机组的生产工艺流程见图l。将配好的LDPE等原料经混合后加入挤出机料斗,经螺杆输送、剪切以及加热而熔融,由计量泵在机筒中部依次加入单甘酯和发泡剂,最后熔料经环形口模挤出。为了获得光滑柔软的片材表面,必须把出口模前的料温降到95℃左右,以提高熔料强度,避免发泡气体冲破坯料表层。刚出口模的坯料为筒状,经剖分后收卷即可。

片材机

                           片材机生产工艺流程图


    片材机成型工艺的主要技术难点如下:
    1、口模处需保持足够的压力,以避免熔料在出口摸前的仟何发泡;
    2、产品的幅宽、挤出量、熔料压力、环形口模直径和冷却定型鼓直径之间均存在着紧密的相互关系,使改造难度增大。

片材机生产的片材提高塑料成型


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