"Screen sticking" (or "mesh clogging/adhesion") refers to a phenomenon in screen printing where ink adheres to the screen mesh rather than transferring cleanly, resulting in poor print quality. This typically occurs when ink fails to fully pass through the mesh openings onto the substrate, leaving residue within the mesh or on the screen surface.
There are several causes for screen sticking, including:
Improper ink selection: Ink that is too viscous or has poor drying characteristics is prone to sticking to the screen. Therefore, selecting an ink that matches the printing material and specific requirements is crucial.
Screen production issues: Inappropriate mesh size, shape, or depth-or defects during the screen-making process-can easily lead to ink adhesion.
Improper printing operations: Insufficient printing pressure or excessive printing speed can prevent ink from fully transferring to the substrate, causing it to remain on the screen. Additionally, failing to thoroughly clean and dry the screen before printing can contribute to ink sticking.
To address the issue of screen sticking, the following measures can be taken:
Select appropriate ink: Choose an ink with suitable viscosity and drying properties based on the printing material and requirements.
Produce high-quality screens: Ensure the mesh size, shape, and depth are appropriate and that the screen is free of defects during production.
Ensure correct printing operations: Maintain appropriate printing pressure and speed to ensure complete ink transfer to the substrate. Furthermore, thoroughly clean and dry the screen before printing to prevent ink adhesion.
