The measures taken after the packaging printing ink is crusted. Everyone knows that when the ink in the ink fountain is formed into a layer of film due to the drying of the surface during the printing process, either a stirring device is placed or the ink is simply poured off. Otherwise, the film will be It will adhere to the roller, and as a result, the layout will be uneven, resulting in contamination of the printed matter. The reason for this is that the ink world 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 evaporation, or evaporation, or oxidative drying of the ink system, but the printing industry believes that the ink drum or ink fountain structure is not good, resulting in a non-flowing retention portion from the dryer. The leaked air dries the surface of the ink or the ink blown into 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. Drying on the printing plate early, it overcomes the skin formed by the filming of the printing and printing ink, and eliminates the streaking failure of the graphic.