PSA | Common defects analysis and solutions of coating process!

  • PSA
  • 2018/12/03

 

刀丝和拉丝


原因


  • 刀丝主要是由涂布料液和薄膜中的垃圾,或刮刀刀口缺口造成。 

  • 拉丝主要由导辊运转不灵活,使导辊表面线速度和薄膜速度不一致,引起薄膜表面擦伤。辊筒表面或薄膜表面的尘埃垃圾也会在运转过程中引起薄膜表面擦伤。 


措施


  • 加强涂布料液的过滤,使用清洁的薄膜,保证作业场所的清洁,防止尘埃垃圾堵在刮刀口,保证刮刀刀口圆滑平整,不卷口。 

  • 做好涂布机以及其他相关机器的清洁保养工作,保证所有导辊运转灵活。涂布面上已有拉丝的回用薄膜不能使用。 


白雾和色差


原因


  • 白雾主要由作业环境气候条件的变化引起,当空气湿度上升,空气中的水汽容易冷凝在涂布层表面而引起白雾。涂布料液受潮含有水分也容易引起白雾。 

  • 条状色差主要由刮刀安装不平伏引起,局部色相不均匀主要由涂布橡胶压辊老化变形(或修磨后直径不精准),压力不均匀造成,或网线辊磨损不均匀引起。 


措施


  • 注意气候变化。当潮湿天气时,开启除湿器降低空气湿度,适当提高涂布料液温度,适当调整涂布料液的溶剂比例,不随意敞开涂布料液槽,防止溶剂挥发料液降温引起水分进入料液中。适当降低涂布车速。 

  • 在生产金色产品时,安装刮刀要特别仔细,刮刀要平整、平行、不可有起伏,注意涂布橡胶压辊和网辊的使用寿命。 


涂布发花


原因


  • 刚褪镀的网线辊表面粗糙不平滑。

  • 涂布料液循环不佳有死角。

  • 橡胶压辊老化表面硬度不均匀。 

  • 涂布料液粘度太低或太高,粘度太低容易流挂,粘度太高流平性不佳。 


措施


  • 对新褪镀的网线辊,要仔细打磨直至平滑,以使刮刀能将料液刮均匀。 

  • 改善涂布料液的循环,消灭死角,使涂布料液的浓度均匀。 

  • 注意涂布橡胶压辊的使用寿命,及时修磨橡胶辊的表面,使橡胶辊的表面的硬度适中。 

  • 涂布料液的溶剂滴加要均匀,不能时多时少。


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