Thermal regulator for a printing form laid about a printing form cylinder for anaqueous offset printing

In an anaqueous offset printing system having a printing form on a form cylinder journalled for rotation on an offset printing press, a printing form thermal regulator system, comprising:

• a blast box mounted on the printing press and located directly proximate the form cylinder, said blast box having one or more blast opening means for directing an air flow onto the printing form, said blast box being of compact construction and said opening means extending over substantially the entire width of the form cylinder, said blast box having at least one fan means within the box for forcing air out through said opening means, an air cooler means within the box located in between the fan means and the blast opening means for tempering the air generated by the fan means, means outside said box for supplying fluid coolant to the cooler means, and temperature regulator means for regulating cooling by the tempered air.