Paper Moisture Balance in Lithography.

Some of the requirements for lithographing sheets in controlled atmospheric conditions are considered. A proposed type of chart for decisions on paper conditioning is described. Current conditions and practices in a number of plants have been reported in questionnaire form. A summary of this data is given on: type of air conditioning, temperature and R. H. standards, paper conditioning matters such as percent conditioned, atmospheric balance, rough volume of color register work, use of the paper hygroscope. This work is intended to supplement published material with current operating conditions and problems, with a view toward avenues of improvement.