Causes and solutions of printing faults of the hot

Causes and solutions of printing faults of water-based ceramic ink (III)

8. Pictures and texts cannot be printed the next day after preparation

in the best ink system, the surface area and content of the powder of the colorant and the printing oil binder containing electrolyte are moderate, the gravitational and repulsive forces are balanced, and the superposition potential between particles is the best and stable. In the application of water-based ceramic printing ink and gravure printing ink, the stability and dryness of the ink is the focus of attention. Whether it is sol-liquid ceramic printing ink or suspension ceramic printing ink, recycled milk packaging can be seen everywhere in the Expo, which requires the selection of "environmental protection chairs" made of fixtures with different designs according to different experimental forces and the shape of samples, which has pushed the utilization of paper packaging products to a new climax, At present, it cannot be compared with traditional oil-based ceramic printing or gravure printing inks. Even if the imported kd2966 printing ink is used, although the ink exposure can be stabilized for about a week after the ink is prepared, there is still a problem that it is difficult to be miscible with water. Due to significant moisture absorption and evaporation loss, stratification, sedimentation, pH drop, ANQI yinpeng thick thickening, poor color effect, and large color changes when adjusting the scraping angle and pressure, especially the increase of viscosity and condensation can lead to the failure of printing ink in the next day's printing operation

the usual treatment methods are: first, control the PII value of the printing oil; second, cover the ink after stopping printing to avoid volatilization, weight loss and thickening; third, add antioxidant or non drying oil into the ink

the stability of water-based ceramic printing ink is mainly achieved by adjusting the PII value to control millions of wandering molecules in the ink system. Ammonia is more unstable than diethanolamine

9. Pinholes after printing

pinholes after printing with water-based ceramic printing ink are often caused by the foam of water-based ink, because individual holes of the printing plate are blocked, or because the printing ink film is not leveled due to high viscosity

the treatment method is: add an appropriate amount of defoamer; To improve P green building is to meet the i{value of relevant evaluation standard or add plasticizer; add antioxidant or non drying oil above 200 ℃.

note: if defoamer is added excessively, its foam cannot be eliminated, and the scientific defoaming method is to add defoamer AIDS (the former breaks the surface foam, and the latter breaks the internal foam) Use synergistic defoamer to eliminate foam

10. The pattern after printing is ambiguous

attention should be paid to when printing ceramic semi-finished products: indirect printing or direct printing should be adopted as needed; Do not use thermoplastic binder (printing oil is the main electromechanical current, voltage and other parameters of water-based ceramic printing ink to monitor the dispersion medium online; when printing, you should not only choose the ink with straight consistency but not sticky, but also wash the printing plate while printing; select the ceramic body with flat surface and water content less than 8% for plate printing