PSA | Solution to common problems during scraper coating

  • PSA
  • 2018/12/20

        刮刀涂布作为主要的涂布方式之一,与气刀涂布相比,固含量高、干燥效率高,车速高,产品质量好,涂层表面不受原纸粗糙影响,平滑度高。今天分享的是刮刀涂布过程中的7大解决方案。




1.涂布量不均匀




原因:原纸匀度差,横幅不均匀;涂布头上料槽液位太低(锟式),造成刮刀局部楔形区涂料压力过大;上料锟和背锟间隙调整不当或刮刀磨损等。


措施:改善原纸匀度;提高涂布头上料槽液位,适当降低涂料粘度,清洁涂料喷嘴;观察刮刀磨损情况,及时更换新刮刀等。




2.刮刀条痕




原因:颜料有过大粒径颗粒或干涂料颗粒(推荐仪器:刮板细度计),从原纸表面掉下纤维等,使刮刀刀刃残留杂物;涂料固含量过高,在刮刀下形成不移动的涂料团,涂料颗粒形成条痕;涂料保水性差,涂料过量脱水;刮刀质量不好等。


措施:检查颜料粒度分布;提高原纸表面强度,减少纤维掉入涂料中;及时清洁刮刀;降低涂料固含量,提高涂料保水性。另外,在出现条痕时,可局部按压条痕处刮刀,使刮刀下颗粒随纸张运行排除。




3.涂层桔皮斑




原因:原纸匀度差,造成涂层吸收不均匀;刮刀角度过下或不合适;涂料固含量太高或涂料流动性和保水性差;干燥速度过高。


措施:改善原纸匀度;调整刮刀角度,通常大于20度;更换合适的硬刮刀;降低涂料固含量,降低涂料粘度(相关仪器:粘度杯),或提高涂布量。




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