APPLICATION OF THE MECHANICS OF FLUID-FILLED POROELASTIC SOLIDS TO MIMEOGRAPH TECHNOLOGY

在进行数学和数值分析之前，我们测量了丝网、印刷母版和油墨的各种机械部件的尺寸和材料特性，观察了印刷的原位状态，并建立了油墨通过丝网和母版的流动模型。基于这些结果和流体饱和多孔弹性固体的力学，我们分析了油墨通过由流体填充的多孔弹性单层建模的丝网和印刷母版的流动。假定层被压辊从下方按压，并且从上方经受在印刷滚筒和墨辊之间引起的流体动力润滑压力。层的变形和伴随的油墨流动被证明是由这里新定义的唯一四个无量纲参数。数值结果表明，在各种可能的油墨转移机理中，压辊对油墨的挤压作用起着重要的作用，特别是在压辊对油墨的挤压时间小于油墨层的特征时间的情况下。

Before mathematical and numerical analysis, we measured various machine parts' dimensions and material properties of screens, printing master and ink, observed in-citu states of printing, and made a model of ink flow through the screens and master. Based on these results and the mechanics of fluid-saturated porous elastic solids, we analyzed the ink flow through the screens and a printing master which are modeled by a fluid-filled poroelastic single layr. The layr is assumed to be pressed by a press roller from below and to be subjected from above to the hydrodynamic lubrication pressure induced between a printing drum and an ink roller. The deformation of the layr and the accompanying ink flow were shown to be governed by the only four nondimensional parameters newly defined here. The numerical results showed some important results ; e.g.squeezing-out of the ink from the layr by the layr compaction by the press roller plays an important role among various possible ink transfer mechanisms, especially for the case where the compression duration is small in comparison with the charcteristic time of the layr.