家电用彩涂板在生产卷曲后表面常常会产生压斑缺陷。为了控制压斑缺陷的发生, 在对压斑缺陷影响因素进行研究的基础上, 通过压斑微观形貌以及漆膜涂层玻璃化温度(Tg)的分析测试, 探讨了压斑缺陷的形成机理。结果表明, 压斑缺陷的产生及其形貌特征与彩涂板上/下表面光泽度的差异等相关, 光泽度差值绝对值越大、环境温度越高, 越易产生压斑缺陷; 漆膜涂层的Tg对压斑缺陷形成具有显著性的影响。

Defects of press scar often occur after the appliance prepainted steel sheets are coiled. In order to prevent the defects from occurring, the influencing factors and the surface appearance of the press scar on the appliance prepainted steel sheet were studied and the glass transition temperature (Tg) of the prepainted coating was measured, and the formation mechanism of the press scar was discussed. The results show that the occurring and the properties of appearance of the defect were related to the difference in the gloss of the prepainted coating surface between the up and down sides. The press scar would become more severe as the difference in the surface gloss on the up and down sides and the environmental temperature was higher. In addition, the effect of Tg of the prepainted coating was also noticeable.