Improvement of Alcohol Wetting System for Multi-color Offset Press

In the past two years, the heat exchange structure of the BALDWIN vertical alcohol dampening system, which was introduced by our factory in Heidelberg, Germany, in 1992, is relatively advanced, with small size and excellent heat exchange effect. However, in actual use, the compressor starts frequently, is damaged many times, or works poorly so that the fountain solution does not cool enough, which seriously affects the printing quality. Such as a large number of dirty spots, white spots, full version is particularly evident. The frequent shutdown of the layout and related parts, or even the replacement of the whole system of fountain solution, is time-consuming and inefficient, and seriously affects the efficiency. This is mainly the process of printing powder, ink, paper powder and other impurities fall into the water tank groove, infiltration into the water circulation, resulting in circulation of various debris, especially the tank pump outlet, cooling evaporator loop is blocked serious. The equipment can not be cleaned at any time, but can be cleaned regularly.

I personally cleaned the various debris and carefully observed the working conditions of the circulatory system. I found that the filter in the water tank was actually a metal recessed pad of a cotton filter pad. It was only 0.42m×0.4m×0.05m=0.0084m3. Can not meet about 0.3m3 of water circulation filtration. The newly replaced filter was blocked by a large amount of impurities in a few minutes and lost the effect of passing water. The water mixed with floating impurities spilled into the water tank around, the unfiltered dampening fluid began a new cycle, and soon blocked the pump outlet and evaporation loop opening. Cleaning is very difficult at this time. Hand digging, hooking, rinsing, and time-consuming work affect production. In view of this situation, I have designed and added a filtration device between the color bucket and the total filter, and all of them are stainless steel. Since the installation in early 1994, it has been used with good results, and the dampening fluid has been replaced very little.