为了保护标签的 印刷 图纹和提升标签的品质, 目前很多不干胶标签印刷后都选择了覆膜、上光和烫金等表面整饰处理。
In order to protect the printing pattern of the label and improve the quality of the label, many self-adhesive labels have chosen the surface finishing treatment such as laminating, glazing and bronzing after printing.
Notes on UV glazing process of Jinan label printing
一、标签印刷的 UV 上光
1、 UV glazing for label printing
上光工艺主要应用于镜面铜版纸、 铜版纸类标签的表面涂布, 目的是增加其表面的光泽 度,并达到防污、防潮湿、保护图纹的作用。根据加工方式,不干胶标签材料的上光分为单 张纸上光和卷筒纸上光,其中卷筒纸上光是不干胶标签印刷工艺中较普遍采用的方法。
Glazing process is mainly applied to the surface coating of mirror coated paper and coated paper labels, with the purpose of increasing the surface gloss, and achieving the function of antifouling, anti moisture and protecting the pattern. According to the processing method, the self-adhesive label material glazing can be divided into sheet paper glazing and web paper glazing, in which web glazing is a common method in the self-adhesive label printing process.
卷筒纸标签的上光是在轮转型标签机上进行的。 目前普遍采用 UV 上光工艺, 即:在 印刷 后的图纹表面均匀地涂布一层 UV 上光油。 对于水基墨柔印标签, 上光是必不可少的 一道工序。
Web label glazing is carried out on the wheel transformation label machine. At present, UV glazing process is widely used, that is, a layer of UV glazing oil is evenly coated on the surface of the printed pattern. For water-based ink flexo label, glazing is an essential process.
二、进行 UV 上光工艺应注意以下有关事项:
2、 UV glazing process should pay attention to the following matters:
1. Quality verification of glazing oil
UV 上光油品种多,都有一定的储存周期,并且对环境有一定的要求,所以,使川用前 应检查一下上光油的颜色及其定量涂布后的干燥情况, 以及添加剂的匹配情况, 还要注意观 察与所用的印刷油墨是否有反应。一般要求先进行上光试验,而后再投入正常生产。
There are many kinds of UV varnish, which have a certain storage cycle, and have certain requirements for the environment. Therefore, before using in Sichuan, we should check the color of the varnish and the drying condition after quantitative coating, as well as the matching of additives. We should also pay attention to whether there is any reaction with the printing ink. Generally, it is required to conduct glazing test first, and then put into normal production.
Jinan label printing
2. Thickness of varnish
UV 上光油的流平特性不如溶剂型上光油,若涂布量太大就会使上光后的表面出现条 纹, 影响光反射效果。 涂布量过大还会使上光油干燥不彻底, 仅表层干燥, 造成复卷后粘连。
The leveling characteristics of UV glazing oil is not as good as solvent varnish, if the coating amount is too large, it will make the surface after glazing stripes, affecting the light reflection effect. Too much coating will make glazing oil drying is not complete, only surface drying, resulting in rewinding adhesion.
3. Viscosity and surface tension of varnish
上光油的粘度对其流平特性、干燥速度、 表面光泽都有影响。 要根据不同的纸张, 调整 适合的粘度。 在调控粘度的同时, 还要注意上光油表面张力的变化情况。 要使上光油的表面 张力小于 印刷 品油墨层的表面张力,这样,上光油才能完全润湿上光表面,避免出现针眼、 条痕等质量问题。
The viscosity of varnish has an effect on its leveling characteristics, drying speed and surface gloss. According to the different paper, adjust the appropriate viscosity. In the control of viscosity at the same time, but also pay attention to the change of surface tension. To make the surface tension of varnish is less than the surface tension of printing ink layer, in this way, varnish can completely wet the surface of polishing, avoid the appearance of pinholes, streaks and other quality problems.
4. Speed, coating weight, pressure, drying temperature
上光涂布速度、 涂布量、 压力和烘干温度四者是互相制约的, 需根据不同的纸张表面对 上光油的润湿、吸收情况,合理调整它们之间的关系。
Coating speed, coating weight, pressure and drying temperature are mutually restricted, and the relationship between them should be adjusted according to the wetting and absorption of different paper surface.
5、定期检查 UV 烘干装置
5. Check the UV drying device regularly
UV 烘干装置中的紫外线灯管随着使用时间的延长,有效功率在逐渐降低,一般 UV 灯 管的有效时间是 1000小时。 生产中应定期检测其有效功率, 当使用时间接近 1000小时应及 时更换。
The effective power of UV lamp in UV drying device decreases gradually with the extension of service time, and the effective time of general UV lamp is 1000 hours. Its effective power should be tested regularly in production, and it should be replaced in time when the service time is close to 1000 hours.
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