Details:
Summary:
A formula is derived for calculating stripe width versus load for a rubber covered press roller. The results of nine new sets of measurements of stripe width versus load together with three earlier ones, and the derived formula, are used to determine the degree of correlation between Young's modulus and various measurements of durometer. The correlations are then compared with ones derived by others, from an analysis of durometer gauge indentation. Conclusions are reached regarding the most accurate method both for measuring durometer and for assessing Young's modulus of a rubber roller. Calculations of stress and strain in a typical rubber offset press roller at its conjunction with a rigid flat plate, using the finite element analysis (FEA) method, are also presented. The results obtained, of stripe width versus load, over a stripe width range of 0.13 to 0.46 inch for a 3 inch diameter roller, are shown to support the value of Young's modulus inferred from stripe versus load measurements. It is also shown that finite element analysis is a powerful tool for gaining insight into nip behavior.