印刷压力对柔性版与承印物间油墨状态影响研究

The Influence of Printing Pressure on the Ink State between Flexographic Plate and Substrate

在柔性版印刷工艺中,柔性版是重要部件,其表面形貌对印刷质量产生重要影响。运用接触力学基础理论,对柔性版合压过程,提出弹簧串联模型,解决承印物、柔性版和贴版胶带压缩变形问题。通过测量柔性版表面形貌,分析柔性版表面质量,并运用弹簧串联模型计算不同合压量下柔性版的粗糙度。通过实例计算发现,印刷压力小,柔性版和承印物变形小,油墨与承印物接触不充分,影响油墨向承印物转移;压力过大,柔性版表面粗糙度就会被挤压扁平,导致油墨存储与柔性版和承印物之间量变少,同样引起油墨转移率不足。进行不同压力下柔性版印刷实验,实验结果也验证了印刷压力对油墨转移的影响。因此,运用弹簧串联模型能够解决柔性版表面粗糙度变化问题,得到油墨在柔性版间存在状态,分析印刷压力对印刷质量的影响。

In flexographic printing technology,flexographic plates are important components.And their surface morphology has a significant impact on printing quality.Based on the basic theory of contact mechanics,a spring series model is proposed for the pressing process of flexoplate to solve the compression deformation of substrate,flexoplate and adhesive tape.By measuring the surface morphology of the flexible plate,analyzing the surface quality of the flexible plate,and using the spring series model,calculate the roughness of the flexible plate under different pressure levels.Through example calculations,it was found that the printing pressure is low,the deformation of the flexplate and substrate is small,and the contact between the ink and the substrate is insufficient,which affects the transfer of ink to the substrate.If the pressure is too high,the surface roughness of the flexplate will be compressed and flattened,resulting in less ink storage between the flexplate and the substrate,and also causing insufficient ink transfer rate.Experiments were conducted on flexographic printing under different pressures,and the experimental results also verified the effect of printing pressure on ink transfer.Therefore,using the spring series model can solve the problem of surface roughness changes in flexographic plates,obtain the presence of ink between flexographic plates,and analyze the impact of printing pressure on printing quality.