Fountain solution processing including hardness change

摘要

The arrangement has a fountain solution circuit (2) with a fountain solution supply and return lines (21, 22). Fountain solution is supplied to a damping system by the supply line, and the excessive solution is discharged from the system by the return line, and is re-circulated partially into the supply line. A fountain solution hardness changing device is provided on the circuit such that hardness of the fountain solution circulated at the circuit is changed by the changing device. The changing device comprises fountain solution softening device (3) and a fountain solution hardening device.