Exclusion solution for uneven thickness of ink layer

1. It may be that the knife is soft, or the knife is old, or the squeegee blade is sharp or curved, so the pressure is uneven during printing on the screen printing mesh, which may cause unevenness of the ink color. In this case, the squeegee needs to be replaced or the blade will be scraped. The ink knife is polished after printing.

 

2. Is the ink diluted evenly?

 

In the case of ink, the ink is poorly formulated, or the ink that is normally blended is mixed with the ink. When printing, the ink expands and softens due to the action of the solvent, and the mesh that should be permeable to the ink is blocked, and the function of the plate is made to make the ink Unable to pass. In order to prevent this kind of malfunction, the formulated ink (especially the old ink) should be filtered once and used before use.

 

3. Is the stencil dry?

 

4. When reusing a used plate, the old ink attached to the frame must be completely removed. When the plate is kept after printing, it should be fully washed (including the scraper). In addition, if the back of the substrate or the printing table is dusty, the thickness of the ink layer may be uneven.

 

5. Is the mesh number correct? Generally, the lower the mesh number, the finer the wire diameter, the larger the opening ratio, the larger the ink volume.

 

6. The network spacing around the screen is inconsistent, that is, not at the same level. Therefore, the grid distance around the screen must be adjusted before printing.

 

7. Is the spacing between the workbench and the printing plate reasonable?

 

The gap between the screen plate and the substrate varies depending on the printing conditions. Generally, objects with a hard surface such as ceramics, glass, metal surface, and hard plastic with low ink absorption force have relatively high requirements on printing gap values. For fabrics with softer ink absorption, such as cloth, paper, and soft plastics, the surface of the substrate is less stringent. Generally, prints with higher precision requirements require a gap value of between 1-3 mm when printed. For ordinary prints, the gap can be 2-6 mm. When the surface is printed, the gap value is smaller, and the plane printing time gap value is larger.