What about printing ink too fast on screen board in silk screen?
The following measures are often used to prevent ink bubbles from forming. Use hydrophobic solvents as much as possible. When the ink itself produces bubbles, it can add some anti foaming agent into the ink. If the ink flow is poor, when the screen plate lifting, the ink flow is relatively small, can not fill the screen traces, you can not get smooth surface of the grinding layer.
Determine the amount of clearance between screen printing and substrateThe main reason is that..:Size of screen printing plate size. Tension size of tension net. Central sag of screen printing plate. The shape of the substrate. The nature of the material of the substrate. The substrate surface morphology. The viscosity of the ink.The gap between the screen plate and the substrate is different because of the different printing conditions. Generally lower ink absorption capacity of ceramic, glass, metal surface, hard plastic and other substrate hard surface of the object, the printing gap value requirements are relatively high. And the ink absorption capacity of larger cloth, paper and soft plastic and other substrate surface soft objects, the printing gap requirements are not so strict. Usually printed matter of higher precision requires a gap value of 1-3 millimeters when printing. For ordinary prints, the clearance is 2-6 millimeters. The time difference value of the surface printing is smaller, while the print time gap value is larger.
In order to prevent screen marks after printing, the following methods can be adopted.Use a more liquid ink for printing. May consider to use the drying slow ink printing, increases the ink flow time, causes the ink to be gradually solidified. When making a plate, use a single wire mesh with smaller wire diameter as far as possible.
