Waterborne Ceramic Ink Printing Failure Causes and Solutions (3)

8, the second day after the preparation of printing no graphic

In the optimal ink system, the surface area and content of the colorant and the ink-bearing material containing the electrolyte are moderate, the gravitational force and the repulsive force are balanced, and the superposed potential among the particles is the best and stable. In the application of water-based ceramic screen printing inks and gravure inks, the stable drying of inks is the focus of attention. Whether they are sol-liquid screen printing ceramic inks or suspension-type screen printing ceramic inks, they are currently unable to communicate with traditional oils. Base ceramic screen printing or gravure ink compared. Even though the ink of the imported KD2966 is used, although the ink exposure after ink preparation can be stabilized for a week or so, there is still a difficult problem of miscibility with water. Domestic ink due to moisture absorption and volatile loss, stratification, precipitation, pH value drop Qi Qi Peng thick thickening, hair color effect is poor, adjust the squeegee angle and pressure change in color, especially the increase in viscosity and condensation can lead to There is no ink on the print job for two days.

Usually deal with the method is: First, control the ink pII value, the second is to stop the printing ink to be covered to avoid evaporation loss weight thickening, the third is to add antioxidants or non-drying oil in the ink.

The stability of aqueous ceramic screen printing inks is mainly achieved by adjusting the pII value to control millions of loitering molecules in the ink system. Ammonia instability is greater than diethanolamine.

9, pinholes appear after printing

The appearance of pinholes after the printing of water-based ceramic screen printing ink is often caused by the foam of water-based ink, and also due to the blockage of the individual screen holes of the screen printing plate, and also due to the over-leveling of the printing ink film caused by the high viscosity.

The treatment method is: adding defoamer in proper amount; increasing pi{value or adding plasticizer; adding antioxidant or non-drying oil exceeding 200°C.

Note: If the defoamer is added in excess, the foam can not be eliminated. The scientific defoaming method is to add defoaming agent (the former destroys the surface foam, the latter burst the inner bubble) to synergize with the main defoamer to eliminate the foam.

10, after the screen printing pattern blurred

Care should be taken when screen printing ceramic semi-finished products: Indirect printing or direct printing according to need; can not use thermoplastic linking material (oil is the main dispersion medium of water-based ceramic screen printing ink; screen printing should not only choose the consistency "stand without sticking" The ink, but also with the printing with the printing plate; choose to surface smooth water content of less than 8% of the ceramic blank for screen printing.