PSA | Three factors that cause different theoretical and actual values of bar coating

  • PSA
  • 2019/01/30

线棒一般都是按湿膜来选型的,而用户往往需要的是对应的干膜。线棒涂布时,涂布干膜往往用户最犯难的一个问题。

 

 

 

干膜中的固体份错误

 

 

 

 

那么,干膜与什么相关呢?干膜是有湿膜转化而来的,大多数情况下,干膜=湿膜*固体份%。一般情况下,用户制备干膜涂层的目的是为了测量涂层的物理性能或机械性能。因此,线棒涂布理论实际值不一样很可能是给出的固体份错误导致选择错误的湿膜厚度线棒涂布器。

 

 

国内外线棒涂布器的差距 

 

 

 

 

 

制备膜层所使用的线棒涂布器,精度高的线棒涂布器,标注10um就是10um,而不是20甚至30微米。看似简单原理的涂布棒,有些厂家可以做到刻度标注达0.1um,而有些厂家则不行,特别在超薄涂布时,国内的线棒涂布器厂家跟进口还是有不小的差距,这也是导致涂布理论跟实际不一样的原因之一。

 

 

 

制备涂布的平台

 

 

 

制备涂布的平台,在南北潮我们叫压印床,这种压印床由硬质聚酯板、泡沫层以及橡胶软垫制成,在保持稳定性的同时还减少了人手压力受力不均带来的问题。假如,你用的涂布平台是你直接裁剪的一块长方形的木板,把遮盖力纸放板上便开始刮样,即使你的涂布棒买的是进口的高档货,制得的涂层也未必会满意。这就好比你买了一辆奔驰,却在坑坑洼洼的马路上行驶,奔驰的体验目的能打得到吗?

 

 

手工操作导致误差

除此之外,线棒涂布器毕竟是手工操作,如果制备一个不到10um的涂层,速度不均、左右压力不均、油墨量散布不均等问题一下子就能带来所谓的理论跟实际不一。

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