Many people know the measures taken after packaging the printing ink crust. When the ink in the ink fountain is formed by the surface layer during the printing process, a stirring device is placed or the ink is simply poured off. Otherwise, the film is removed. It will adhere to the roller, and as a result, the layout will be uneven, resulting in contamination of the printed matter.
Investigating the reasons, the ink industry tends to:
(1) The ink is dried too fast;
(2) poor ink flowability;
(3) The precipitation of the ink has dried. However, it is not known that this phenomenon is caused by the volatilization or evaporation of the ink system or the gradient of oxidative drying. However, the printing industry believes that the ink drum or ink fountain structure of the ink is not good, and a non-flowing residual portion is generated, which leaks from the dryer. The air dries the surface of the ink or the hot air blows into the ink in the ink fountain.
Although there are different opinions, but around the emergence of this phenomenon, the printing operators generally adopt the following treatment methods:
(1) It is not possible to use ink that is too fast to dry;
(2) adding a medium dry solvent;
(3) Replacing the deteriorated ink (ie, from poor fluidity to excellent fluidity);
(4) Stirring in the ink fountain;
(5) providing a closed top cover on the ink fountain;
(6) Adjust the angle of the hot air blow. Generally, people who have common knowledge in printing experience, when the dry speed is too fast, or the ink concentration is too light, or the flow is poor, or the ink thixotropy is large, or the ink is static, the method of adjusting the speed of the printing machine is adopted, and the ink is prevented. Early drying on the printing plate overcomes the skin formed by the filming of the printing and printing ink, eliminating the streaking of the graphic.
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