The so-called "silk-ink crystallization" refers to the two color screen printing ink printing interval control is improper, the first printing screen printing ink has been dry solid before overprinting one color screen printing ink. Due to the dry solid ink layer viscosity and the performance of the screen printing ink wet are very low, so the next color screen printing ink is difficult to adhere to the above. Generally, this phenomenon occurs in the monochrome offset printing machine screen printing ink overprinting, in order not to occur screen ink crystallization failure, usually make the first printing screen printing ink layer must have the following conditions:

(1) maintain a certain wettability, can be printed after the screen printing ink wet and attached.

(2) maintain a certain viscosity, and the adhesion of the screen printing ink is greater than the cohesion of the screen printing ink.

(3) control the amount of desiccant (dry oil). If there is a printing process failure of "ink crystallization of silk printing oil", the printing ink surface can be rubbed with fine gauze, so that the surface of the ink film is rough, and the capillary adsorption force can be increased to improve the ink overprinting effect. For printing a large size, large batch of "silk screen ink ink crystallization" printing, the first overprint on the surface of the silk screen ink with high viscosity of the ink, the use of its strong adsorption, attached to the dry solid ink layer, and then it as a medium, so that the silk screen printing ink is well attached. For example, a factory with monochrome offset printing press printed one hundred thousand flowers calendar, its pattern is a red peony, paper 128g/㎡ double copper, silk screen printing ink for dry light. When yellow, magenta after printing, overprint sky blue, midway found many places sky blue ink is difficult to adhere to. Kunshan PCB screen printing ink

[Case Study] : This is a typical "silk screen ink crystallization" phenomenon, the reason for this phenomenon, one is the use of poor ink absorption of paper, two is the use of fast drying light silk screen printing ink, three is put too much white paper. Therefore, in view of this situation, special attention to monochrome offset printing press white paper quantity to appropriate control, in addition to the appropriate transformation of color sequence. Processing method: because of the large print so had to cover the oil, and then printing. Be sure to plan your next printing.