柔性版印刷中瓦楞纸板的印刷均匀性——瓦楞纸板对网目调网点变形的影响.pdfVIP

58 PAPERS DIGEST CHINA PRINTING AND PACKAGING STUDY Vol.01 No.02 2009.04 动1次，喷嘴喷出小墨滴。当SI数据分别是“10”和 1） 被选中的喷嘴和墨滴大小是通过控制SI数据 “11”时，压电元件分别振动2次和3次，使喷嘴分别 实现的，滴墨大小为68 72μm。 ～ 喷出中等墨滴和大墨滴。 2） 当驱动信号的电位差超过24V时，墨滴是通过驱 其试验方法是用PC机生成输入信号，然后将输入 动信号实现的。因此，24V是成功生成小墨滴的临界值。 信号送到HC电路，驱动信号经过电压放大电路产生 3） 当驱动信号电位差通常是24V时，打印头喷 所需要的电位差；使用的基材是一个载玻片。本研究 嘴是稳定的，并能精确地喷射墨滴。 采用两种试验方法，一种是基于各种不同的SI数据， 4） 喷嘴喷射墨滴时，V （高压）和V （低压） h s 另一种是使用各种波形的驱动信号。由此，可得到各 的合适电位差是2 4V。 ～ 种不同的试验数据。研究结果表明： （张桂兰 编译） Print Uniformity of Corrugated Board in Flexo Printing: Effects of Corrugated Board and Halftone Dot Deformations Author Martin Holmvall, Tetsu Uesaka Fibre Science and communications Network, Mid Sweden University, SE-851 70, Sundsvall, Sweden Abstract Print non-uniformity is a major concern for flexo post-printers. Many of these non-uniformities are suspected to be caused by the corrugated board structure itself. Striping is the most obvious one, but also other print quality problems might be structure-related. This work focuses on how deformations of the board might lead to print non-uniformities, and if the deformation of halftone dots is the mechanism behind striping in halftone flexo post-printing.Finite element models were used to analyse the effects of deformations of corrugated boards and compressed halftone dots in the printing nip. Distortions of the board due to non-uniform hygro-thermal strains were sho