A Study of Lithographic Performance Mechanical Vs. Thermodynamic Considerations

Experimental evidence has been presented which confirms the desirability of low interfacial tensions between litho inks and fountain solution. This was proposed in an earlier work as deriving from theoretical consideration. The roles of press dampening system, paper surface properties, and litho plate surfaces in altering the theoretically desirable surface energy relationships between the various components of the printing system have been analyzed, in respect to obtaining the most tolerant litho performance on press. A parameter has been identified which can be used to evaluate fountain solution efficiency. This parameter is linearly related to optimum fountain solution feed.