source:Other information release time:2023-09-08 Hits: Popular:PCB Assembly company
1. Blocking holes
The reasons for this type of situation are: the printing material dries too quickly, the screen dries up and blocks holes, the printing speed is too fast, and the scraper strength is too high. The solution is to use organic solvent with slow volatile matter to prepare the printing material, and gently clean the screen with a soft cloth dipped in organic solvent.Solar Energy System
2. PCB screen ink leakage
The reasons for such failures include: floating dust and dirt on the surface of the PCB board or in the printing material, causing damage to the screen during screen printing; In addition, during printing and plate making, insufficient exposure of the screen mask adhesive results in incomplete drying and ink leakage of the screen mask. The solution is to apply adhesive tape or tape to the small circular hole of the screen, or repair it with screen making adhesive.
3. Damage and reduced precision of the screen version
Even high-quality screen plates, after long-term application, will gradually reduce or damage their precision due to damage caused by board scraping and printing pressure hazards. The service life of immediate legal screen printing is longer than that of indirect legal screen printing, and in general, immediate legal screen printing is used for mass production.
4. Faults caused by excessive imprinting
If the pressure of the scraper is too high, it will not only cause a large amount of printing material to pass through, causing the scraper to bend and deform, but also result in a small amount of printing material passing through, making it difficult to print clear images on the screen. It will also continue to cause damage to the scraper, drop of the screen mask, elongation of the metal wire mesh, and image deformation.
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