A pollution-preventing lithographic ink system works conventionally at a pH less than 7, but becomes its own emulsifying agent at high pH. Accordingly, it can be washed off lithographic printing presses with aqueous base. The emulsification kinetics of the ink have been experimentally studied as mass transfer coefficients under the conditions of low shear. Correlations for this mass transfer suggest that washing is controlled by diffusion of components within the ink. The results point toward a strategy for achieving other pollution-preventing technologies.
Bibliographical noteFunding Information:
The authors benefited from conversations with T. J. Pen-naz and J. H. Burban. This work was supported by the Deluxe Corporation, by the Environmental Protection Agency through the National Center for Clean Industrial and Treatment Technologies (grant R819688), and by the National Science Foundation (grant CTS 96-27361). The paper does not necessarily reflect the views of these organizations. A.N.B. had a partial fellowship from the Indian Institute of Technology (Delhi).
- Mass transfer