Study on Elastic Deformation Properties of the Blanket in Offset Printing

Abstract

This paper analyzes elastic deformation properties of the blanket in offset printing due to a contact load of the impression(or plate)cylinder with the blanket cylinder, considering anisotropic properties and the laminated construction of the blanket. The two dimensional elastic theory is applied to solve the contact problem of the blanket and the numerical solution provides details of the contact pressure distribution, the deformation of the blanket, and the contact width of the blanket with the impression(or plate)cylinder. Influences of Young's moduli and thickness of each layer of the blanket on the contact pressure distribution and the deformation of the blanket, are examined by the theory. The experiments are carried out for measuring the contact pressure distribution and the deformation of the blanket and the calculated results are in fair agreement with those of experiment.