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彩塗板色差和哪些因素有關

来源：宝钢彩塗卷 | 發布日期：2022-06-02

彩塗板現在的應用越來越廣泛的材料，憑著自身耐久性好，硬度耐性好等優點，深受使用者的喜愛。彩塗板色差的原因和哪些有關，接下來讓我們一起來了解一下吧：

一、塗料

由于塗料攪拌不均勻或不同桶塗料黏度差異大，塗料在料盤中從進料口一側向回流口方向延伸，出現色差帶。另外更換塗料顔色，特別是顔色反差較大的兩個顔色，會由于清洗不幹淨，造成色差。

二、基板

基板鋅花大小的不同也會影響色差，在晶界處會形成許多大小不一的小凹坑，對板面色差造成影響。對淺顔色而言色差尤爲明顯，選用無鋅花或小鋅花基板比較好。

三、化塗處理

化塗工藝不當，造成化塗膜過厚，烘幹後會使板溫不足。若是塗輥輥身有傷，烘幹後就會形成發黃斑塊，造成彩塗板色差，尤其淺色明顯。

四、膜厚

膜厚穩定性對彩塗板色差的影響較大。膜厚的調整方法主要有：塗料粘度、調整輥塗機粘料輥與塗敷輥之間的縫隙、改變塗敷輥和粘料輥的輥速、調整塗敷輥與帶鋼支撐輥之間的壓力等。

五、PMT

PMT表示塗料固化完好時，帶鋼所需達到的峰值溫度。PMT穩定性對彩塗板色差的影響較大。帶鋼規格變動會造成PMT變化、局部溫度偏高或偏低會影響PMT變化、基板厚度不均會造成PMT變化、季節變化爐內溫度變化也會造成PMT變化。

六、冷卻水

霧化冷卻，冷卻水沒有及時更換，當爐氣中有機溶劑的揮發物遇冷冷凝下來，隨著冷卻水被帶到板面上，經過擠幹輥擠壓後，在板面上造成色差。生産中，冷卻水應適當保持溢流，讓冷凝下來的揮發物及時溢流去除，才能避免造成板面色差。

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