| 摘要 |
PROBLEM TO BE SOLVED: To eliminate the replacement of a filter required by clogging by suspended solids in dampening water and to prevent the accumulation of ink in the dampening water. SOLUTION: In an apparatus for cleaning dampening water, the dampening water which is returned from a relay tank 9 into which the dampening water is introduced from a dampening water boat 1 to the boat 1 through a dampening water cooling/circulating tank 8 is cleaned. Part of the dampening water flowing from the tank 9 to the tank 8 is divided by a branch pipe. A process tank 10 in which the dampening water divided by the branch pipe 15 is allowed to stand, a concentration tank 11 which receives liquid of an upper layer from the tank 10, separates suspending ink, and returns the residual liquid to the tank 10, and a filter device 7 which filters the liquid in the tank 10 and introduces the liquid into the tank 8 are provided. The filter device 7 uses a cross-flow type ceramic ultrafiltration membrane.
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