Screen printing fault analysis

1. Blocks caused by bad printing plates are blocked, so plates should be replaced.

2. If dust is mixed on the substrate or in the ink, the dust will scratch the plate under the pressure of the squeegee during printing; the solvent in the ink will also make the plate produce pinholes, which will cause the plate to leak. The reason for ink.

3, poor ink deployment, or the normal deployment of the ink mixed with hard particles, printing due to the role of solvent expansion, softening, the ink should be blocked through the mesh, played a role in the film, so that the ink can not pass, cause Ink is uneven.

4, According to the method of plate making, the life of the printing plate has a long or short life. Generally speaking, the direct method photosensitive plate has a longer service life than the indirect method photosensitive plate.

5. If the press pressure exceeds the required pressure, the amount of ink that is pressed out will not increase. On the contrary, due to excessive pressure, the tip of the squeegee will be so curved that the squeegee will not be fully squeegeeed.

6, the screen printing ink layer is very thick, so when the drying is often a failure. Printed materials should be dried by proper methods. Whether it is manual prints or mechanical prints, different drying methods should be adopted according to different printing conditions.