When printing jobs, when the basic data such as conductivity, pH and alcohol content of the fountain solution are determined, it is necessary to comprehensively manage the fountain solution according to the actual state of the offset press.
(1) Test the fountain solution in the water tank multiple times with a pH test paper or pH meter every day. Check the pH sensor once a month to confirm whether there is any deviation and adjust accordingly.
(2) Temperature control of fountain solution. The temperature in the water tank should be 8 ° C to 10 ° C, and the temperature of the fountain solution in the water tank should be 12 ° C to 15 ° C.
(3) In daily printing, the pH value should be 4.8-5.3, and for special inks such as gold and silver ink, the pH value should be 6.0-7.0.
(4) If isopropyl alcohol (IPA) is used, the purity must be above 99.9%, and the amount added should not exceed 5%. The alcohol meter and proximity switch need to be regularly checked and maintained.
(5) A large amount of debris such as spray powder, paper powder, ink and cleaning fluid will be mixed in the fountain solution, which will easily change the water quality. Therefore, the existing fountain solution should be released every week to carry out the dampening system. Thoroughly clean and replace with new fluid.
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