Methods and solutions for improvement of offset printing

Details Methods and solutions for improvement of offset printing Methods and solutions for improvement of offset printing

1975-03-17

1977-03-22

Morris, Theodore

Printing

Planographic

Processes of lithographic printing

106 2, B41N 308, B41M 102

Patent

active

040130088

ABSTRACT:
Disclosed are the uses of polyphosphate solutions as fountain solutions in the dampener roll systems of offset presses and as rub-up solutions for preparing offset plates for storage without corrosion. In the fountain solution application of the invention, the polyphosphate concentration may run from about 0.6 g/l to about 42 g/l; in the plate storage application of the invention it may run from about 6 g/l to about 66 g/l. Particular polyphosphates which are useful in the invention include sodium tripolyphosphate, sodium hexametaphosphate and aminomethylenephosphonate.

REFERENCES:
patent: 2441653 (1948-05-01), VanDussen, Jr.
patent: 3354824 (1967-11-01), Griffith et al.
patent: 3394653 (1968-07-01), Riesberg
patent: 3696746 (1972-10-01), Harper
patent: 3764353 (1973-10-01), Shimizu et al.
patent: 3775135 (1973-11-01), Harper

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