机制纸与手抄纸及其印品老化过程研究

探索纸张本身颜色和印刷品颜色随环境条件变化而变化的规律,对于纸张的使用和保存甚至文物的保存都有一定的意义。实验中选取三种纸张和三原色油墨,通过IGT印刷适性仪进行打样,分别将样条置入氙弧灯老化仪中在一定条件下进行老化后,使用分光光度计对老化前后样条的L＊、a＊、b＊值进行测量,计算得出色差ΔE,并绘出老化时间与色差关系曲线。同时,观察光谱反射率曲线变化,再利用拉曼光谱仪测量其谱图变化。研究结果表明,纸张本身和印品样条在老化前后产生色差,纸张本身的光谱反射率也产生一定变化,而印刷品光谱反射率曲线无明显变化,且纸张分子结构未发生变化,但拉曼强度增强。

Study on Aging for Mechanical Paper/Handmade Paper and Their Prints

The responses of the original color of paper and that of print towards changing environment were studied in this paper, which was important for the use and the preservation of papers.In this experiment,three papers and three primary color inks have been specified and aging were completed by xenon lamp after the paper samples being printed by IGT printability tester,respectively.L~＊,a~＊,b~＊ values of the aging samples were measured by using the spectrophotometer and the color differences were calculated according the color difference formula and L~＊,a~＊,b~＊ values.The relations curves between color differences and aging times were plotted.Meanwhile,the change of the spectral reflectance curve was observed and measured by using Raman spectrometer.The results show that both the paper color and print color changed after aging.The spectral reflectance of the original paper changed to some extent,while the print reflectance curve had no obvious change,moreover, the molecular structure has not been changed,but the Raman scattering enhanced.