目的 研究影响奶粉罐耐光性的相关因素,为解决当前市场上奶粉罐存在的褪变色问题提供参考。方法 采用滤光氙弧灯加速老化试验模拟实际光照环境,验证油墨与颜料粉耐光等级是否一致,并重点分析上光工艺、网点覆盖率、冲淡剂添加比例,以及网点和冲淡剂的组合使用对奶粉罐耐光性能的影响。结果 所测试的油墨耐光等级与对应颜料粉的耐光等级基本保持一致;上光油可对油墨层起到一定的保护作用,有效提升了耐光性能;网点与冲淡剂对油墨印刷品的耐光性有显著影响,尤其印刷工艺中需选用低耐光等级油墨时,需谨慎评估低网点或高冲淡剂比例及两者组合的使用。结论 为确保奶粉罐具备良好的耐光性与颜色稳定性,建议在实际应用中优先选用高耐光等级的油墨,同时严格控制网点覆盖率及冲淡剂的添加比例。
Abstract
The work aims to analyze the factors affecting the light fastness of milk powder cans and to provide a reference for fading and discoloration issues of milk powder cans in the market. The accelerated xenon arc aging test was adopted to simulate natural light exposure, in order to verify the consistency between the light fastness grades of printing inks and their corresponding pigments. Then, particular attention was given to the effects of varnishing, dot coverage, diluent addition ratios, and the combined use of dots with diluent on light fastness performance. The light fastness grade of the tested inks was generally consistent with those of the pigments. The application of an overprint varnish provided a protective effect and effectively improved its light fastness. Both dot coverage and diluent ratios significantly impacted ink light fastness. In particular, when low light fastness inks were employed, the use of low dot coverage, high diluent levels, or their combination should be carefully evaluated. Overall, to ensure superior light fastness and color stability in milk powder cans, it is recommended to prioritize high-grade lightfast inks while exercising strict control over dot coverage and diluent concentration.
关键词
奶粉罐 /
油墨 /
耐光性 /
印刷网点 /
冲淡剂
Key words
milk powder can /
ink /
light fastness /
printing dot /
diluent
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