Parameter Study of Offset Press Cylinder Based on Sliding Friction

Abstract

In the contact area of offset, a relative slide occurs between the surface of plate cylinder and blanket cylinder, which changes the print image and influences the printing quality. The relative slide in the cylinders’ rolling process is investigated, and the determination rule of cylinders’ geometric parameters of offset press is proposed. The results show that the relative slide is minimization under the condition that the compression of elastic cylinder radius is 0.2 times bigger than that of rigid cylinder radius, and the deformation of print image and dot gain both are minimization. The results provide theoretical direction for accurate determination of cylinder radius of offset press.

Rigid-Flexible Coupled Modeling and Simulation Analysis of Printing Cylinder Based on ANSYS

“…The blanket was caused deformation in extruding, which caused a sliding on cylinder's surface, and the change on the size of the printing graphic, which all have impact on printing quality. The contact printing between the two cylinders was analyzed by using finite element method, and the change regularity of printing pressure in imprinting area was obtained [1]; the relative slide state of contact area was studied in the process of rolling, the defining principles of offset cylinder structure parameters has been got [2]; the design and researched dynamic characteristics of the blanket cylinder were improved, a aseismic plan was brought out [3]; the strain on plate cylinder that equipped with a blanket and cylinder packing was analyzed, and the maximum elongation of printing graphic which transferred from plate cylinder to blanket cylinder was achieved [4]. Above literatures are limited to analyze the contact of one cylinder or between two cylinders, actually, for the presence of cylinder gap and the complexity of three-cylinder arrangement, it led to distribution inconsistent of the cylinder strain in circumferential direction.…”