Poor wetting fluid may cause malfunction

Wetting fluid is not suitable

Too much or too much wetting fluid can easily cause damage to the graphic and textual basis. In particular, by emulsifying the ink, the wetting fluid will enter the ink layer, which will affect the ink properties more easily, and even block the drying speed of the imprinting. Chained printing problems, such as the back of a dirty product. Therefore, the amount of wetting fluid should be kept as low as possible during printing to maintain the balance of water and ink in the layout. The proper wetting fluid concentration should be adjusted according to the printing characteristics and conditions.

Printing plate surface becomes lighter

When the wetting fluid's acidity is too strong, it will cause corrosion on the plate surface and reduce the density of the layout image. To this end, the wetting solution should be diluted with water or ammonium nitrate, potassium nitrate and other neutral salts should be added to make the pH value control. Between 3.8 and 4.5.

Dirt on the blank area of ​​the layout

When the acidity of the plate wetting liquid is too weak, the hydrophilic film layer is destroyed and the dirty plate failure occurs, which can increase the acidity of the wetting liquid, ie, properly reduce the pH of the fountain solution.