Screen Printing Faults and Countermeasures - Ink Film Edge Defects

Third, the ink film edge defects

In screen-printing products, the problem that often arises is the appearance of jagged burrs (including incomplete or broken lines) at the edges of the printed ink film. There are many reasons for glitches, but the main reason is the quality of screen printing.

Sensitive adhesive resolution is not high, resulting in fine lines appear broken or incomplete.

If the exposure time is not enough or the exposure time is too long, the development will be insufficient, and the edge of the screen printing graphic will not be neat and appear serrated. For a good screen printing plate, the edges of the graphic should be smooth and neat.

The surface of the screen printing plate is not smooth. When printing is performed, there is still a gap between the screen printing plate and the substrate. Due to the ink penetrating into the space, the burrs on the edges of the printing ink are reproduced.

During the printing process, due to swelling of the printing film after contact with the solvent, and the degree of swelling in the latitude and longitude is different, the surface of the printing film is uneven. During the printing, a gap appears between the screen printing plate and the surface of the printing material, and the ink floats through the ink. There will be glitches on the film.

To prevent the occurrence of saw-tooth burrs, consider the following solutions:

Select high screen mesh plate making;

Choose high-sensitivity photosensitive materials for plate making;

Make a certain thickness of screen printing plate to reduce the expansion deformation;

Stretch the stretch net as much as possible, the best angle is 22.5. ;

Fine line printing, plate making as much as possible using indirect plate making, because indirect plate making may be less glitch;

In the process of plate making and printing, try to control the temperature expansion factor and use a photosensitive material with a small expansion coefficient;

Improve the quality of plate making, ensure that the surface of the screen plate is smooth, and the edges of the screen lines must be neat;

Spray the screen plate with a water jet gun to improve the development effect;

The distance between the screen plate and the substrate, the scraper angle, and the printing pressure should be appropriate.