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近年来,高防护性能的三防(水、油、可塑剂)热敏纸已广泛应用于标签,同时也应用在保存性能要求较高的彩票领域。一般三防热敏纸包含三个涂层:底涂层(或称预涂层、隔热层)、面涂层(或称热敏层、显色层)、保护层(或称顶涂层)。其中由底涂层提供隔热性能,面涂层提供发色性能,保护层提供耐水、耐油、耐溶剂、耐可塑剂、耐湿摩擦等保护性功能。相较一般的仅有底涂层和面涂层的热敏纸,三防纸涂布的工序至少需在原纸上涂布三次以上,不仅工序增
In recent years, three protective (water, oil, plasticizer) thermal paper with high protection performance has been widely used in the label, but also in the field of lottery which requires high preservation performance. General three thermal paper contains three coatings: primer (or pre-coating, insulation), topcoat (or thermal layer, color layer), protective layer (or top coat ). Among them, the primer coating provides thermal insulation performance, the top coat provides the chromogenic performance, and the protective layer provides the protective functions of water resistance, oil resistance, solvent resistance, plasticizer resistance, wet friction and the like. Compared with the general thermal primer with only primer and topcoat, the process of three-coat coating needs to be coated at least three times on the base paper,