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浅议光油固化程度检测方法

2021-06-20欧阳福

绿色包装 2021年3期

欧阳福

摘要:光油固化程度不同,包装印刷品的表面硬度、耐摩擦划痕、摩擦系数、光泽、附着力等性能均有显著差异。以卷烟商标纸为例,高速卷烟自动包装机要求印刷品表面硬度、动/静摩擦系数必须控制稳定在一定范围。因此光油固化程度的控制与检测是控制印刷品质量一致性和稳定性的基础,但一直缺乏有效的檢测办法。本文从光油固化产物的角度出发,归纳评述了光油固化程度常用的几种检测方法及其特点,以期抛转引玉,为寻求更简便有效的光油固化程度检测方法提供参考。

关键词:UV固化光油;固化程度;双键转化率;动摩擦系数

中图分类号:TS8 文献标识码:A 文章编号:1400 (2021) 03-0040-03

Discussion on Testing Method of Curing Degree of Varnish

OU Yang-fu(Guangxi Zhenlong color printing packaging Co., Ltd, Fuchuan County, Guangxi 542700, China)

Abstract: The surface hardness, scratch resistance, friction coefficient, gloss and adhesion of the printed outer packing are significantly different with different curing degree of varnish. Taking cigarette brand paper as an example, its surface hardness and dynamic / static friction coefficient of printed must be controlled and stabilized within a certain range so as to meet the requirements of high speed automatic packaging machine. Therefore, the control and detection of curing degree of varnish is the basis of controlling the consistency and stability of printing quality, but there has been a lack of effective detection methods. In this paper, from the point of view of curing products of varnish, several common detection methods and their characteristics of curing degree of varnish were summarized and reviewed. It provides a reference for finding a more simple and effective method to detect the curing degree of varnish.

Key words: UV curable varnish; curing degree; double bond conversion; dynamic friction coefficient

包装印刷品表面上光是印后加工最重要的方式之一,即在印刷品表面涂布一层上光油,保护印刷图文、美化印刷品外观和提高印刷品的防潮性、耐磨性、光泽度和爽滑度等性能。由于阳离子光引发剂等各种原材料价格昂贵,目前印刷装潢用的光油绝大多数是自由基聚合的光油。光固化过程中,光油的主要成分预聚物和单体在光引发剂的作用下C=C双键打开,预聚物和单体进行化学反应,有三种可能的产物:一是预聚物之间或预聚物与单体反应继续链增长,预聚物分子量大幅度增加,二是单体与单体反应生成高分子量的聚合物,三是分子链与分子链之间形成C-C共价键实现交联。同一类光油,光引发剂的种类和用量不同,三种产物各自的分子量和相对含量又有所不同,导致固化产物具有不同的表面物理性质。……

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