With the continuous development of society, the development of screen printing machines has also promoted the rapid development of the screen printing manufacturing industry. The screen printing machine is a device that leaks solder paste or patch glue onto the PCB pad through the screen. During the printing process, it often encounters a lot of dirt on the screen printing screen. Template life.

1. When the template is contaminated

When using a flat screen printer, stop the printer after printing a set of sheets, and then input a piece of blotting paper to make the screen contact with the blotting paper. Keep the screen at the printing position, and then use a non-abrasive soft cloth dipped in a screen cleaner to wipe off the dirt on the squeegee surface of the stencil. On the absorbent paper below, another piece of absorbent paper can be used to repeatedly clean the mesh if necessary. After cleaning, the template can be dried with a blower (called "cold air").

Second, when printing high screen line color images

The emulsifier film under the silk thread is only 5-6um thick, and the wire diameter of the mesh itself may be only 30um, which can't bear to rub hard. The key to avoid rough decontamination is to prevent the template from being contaminated. The main cause of stencil contamination is improper ink control, which causes dry ink to remain in the mesh. There should be no change in the state of ink adjustment. When using UV-curable inks, efforts should be made to prevent the screen from being irradiated by ultraviolet lamps and also from sunlight.

3. When there is dirt or dry ink on the printed part of the picture

The screen should be decontaminated, and the screen frame should be lifted after stopping the printing machine. At this time, some operators will vigorously wipe the underside of the template with a sand cloth dipped in solvent. Templates are often damaged. A truly knowledgeable operator seldom rubs the graphic printing surface of the stencil, because he knows that the clarity of the printed text requires all the edges of the graphic to maintain a clear emulsion layer graphic interface. Rubbing hard will damage the graphic interface of the emulsion layer, or even wipe off the emulsion layer, leaving only bare mesh.

Fourth, when cleaning the round pressure screen printing machine

Due to the design and structure of the screen printing machine, the dirt cannot be washed down on the absorbent paper like the ordinary screen printing machine. Fortunately, because the printing speed is relatively fast, the possibility of the ink drying in the mesh is not high. Sometimes it is necessary to remove the dirt under the template. In this case, the dirt should be gently wiped off with a soft cloth, and do not use excessive force. In the production process, the above cleaning and decontamination methods should be frequently used to extend the service life of the stencil and screen printing machine and reduce the scrap rate.