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In offset printing , the water bar refers to an obvious shallow strip mark on the printing plate surface and the printing plate when printing flat or solid printing, commonly known as "white bar" or "white bar". The water bar is generally caused by the water delivery part. The solution to the production of water bars in offset printing is:
(1) The pressure between the upper water roller and the main ink is too large, and the pressure between them should be readjusted to make it appropriate to relieve some pressure;
(2) ink emulsification, water roller surface area too much ink;
(3) If the layout moisture is too large, the water supply should be reduced, the blanket should be cleaned, and the ink roller should be cleaned in severe cases;
(4) The dampening water is too acidic, and the acidity of the dampening water should be lowered.
The production of water bars in offset printing will affect the quality of the products, there is no way to deliver to customers, and it is necessary to solve them in time.
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