滚筒跳动对柔性版印刷质量的影响  

Effect of Cylinder Runout on the Quality of Flexography

作　　者：徐嘉妮 袁英才[1,2,3] 李艳[1,2,3] 乔俊伟 范振宇 王轩 顾天祺 XU Jia-ni;YUAN Ying-cai;LI Yan;QIAO Jun-wei;FAN Zhen-yu;WANG Xuan;GU Tian-qi(Beijing Key Laboratory of Digitization Printing Equipment,Beijing Institute of Graphic Communication,Beijing 1,2,302600,China;Engineering Research Center of Printing Equipment of Beijing Universities,Beijing Institute of Graphic Communication,Beijing 1,2,302600,China;Beijing Engineering Research Center of Printed Electronics,Beijing Institute of Graphic Communication,Beijing 1,2,302600,China;Shanghai Publishing and Printing College,Shanghai 200093,China;Science and Technology on Space Physics Laboratory,Beijing 1,2,300076,China)

机构地区：[1]北京印刷学院数字化印刷装备北京市重点实验室,北京102600 [2]北京印刷学院印刷装备北京市高等学校工程研究中心,北京102600 [3]北京印刷学院北京市印刷电子工程技术研发中心,北京102600 [4]上海出版印刷高等专科学校,上海200093 [5]空间物理重点实验室,北京100076

出　　处：《包装工程》2022年第9期264-269,共6页Packaging Engineering

基　　金：国家新闻出版署“智能与柔版印刷”重点实验室招标课题(ZBKT202103,ZBKT202006);国家新闻出版署2019年度优秀重点实验室资助项目(Z6E–0404–20–01–01y);2021年国家级大学生创新创业计划项目。

摘　　要：目的研究压印滚筒径向跳动对印刷压强与网点变形的影响,为降低柔性版印刷中网点扩大率、提高印品质量提供参考依据。方法论文以柔性版印刷为例,运用接触力学基础理论分析压印滚筒与印版滚筒间接触状态,构建柔性版最大印刷压强分析模型。运用有限元分析方法,得出印刷压强与柔性版网点压缩变形关系,从而构建出压印滚筒跳动引起柔性版网点扩大率分析模型。通过实测得到柔性版印刷机压印滚筒径向跳动波形。结果最大印刷压强的增加会增大网点顶端接触面积,使网点扩大率增大;压印滚筒的径向跳动改变了印刷过程中的实际合压量,造成印刷过程中最大印刷压强的波动,因而在柔性版印刷过程中需要严格控制合压量;在合压量为0.1 mm时,径向跳动量为−0.05399~0.05448 mm。对于加网线数为69线/厘米、50%网点的印版,网点扩大率在3.639%~9.526%波动。结论压印滚筒径向跳动改变了滚筒间的实际合压量,引起印刷压强的变化,使网点产生不同的变形,从而严重影响印刷质量。This paper aims to study the influence of the radial runout of the embossing cylinder on the printing pres-sure and dot deformation,so as to provide a reference basis for reducing the dot gain rate and improving the print quality in flexographic printing.This paper built an analysis model of maximum printing pressure in flexographic through using the basic theory of contact mechanics to analyze the contact state between the impression cylinder and the plate cylinder,taking flexographic as an example.An analysis model for the dot gain rate because of the impression cylinder run-out in flexographic plate was built by using the Finite Element Method to analyze the relationship between the printing pressure and the dot deformation on flexographic plate,building.Combining with actual measurement of the impression cylinder radial run-out waveform and the analysis model of pressure and dot gain rate in flexographic,it can be conclude that:The amount of compression need to be accurately controlled as the increase of the maximum printing pressure will increase the top dot area and the dot gain rate;The radial run-out of the impression cylinder will change the actual amount of com-pression,which makes the maximum printing pressure fluctuate during printing in flexographic;When the pressing amount is 0.1mm,the radial runout is−0.05399~0.05448mm,the number of lines is 69 lines/cm,the printing plate with 50%dots,and the dot gain rate fluctuates between 3.639%~9.526%The radial runout of the embossing cylinder changes the actual pressure between the cylinders,causes the change of the printing pressure,and causes different deformation of the dot,which seriously affects the printing quality.

关 键 词：柔性版印刷 合压量 滚筒跳动 网点扩大 

分 类 号：TS873[轻工技术与工程]