| 摘要 |
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.
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