How to solve the problem of poor adhesion of screen printing ink

Poor adhesion of screen printing ink is a common problem, and solutions can be approached from multiple perspectives. The following are detailed solutions to this problem:

I. Cause Analysis

Poor adhesion of screen printing ink can be caused by a variety of reasons, including but not limited to:

Improper selection of ink and substrate, resulting in ineffective adhesion of the ink to the substrate.

The substrate surface is unclean, with oil stains, dust, or other deposits, which affect ink adhesion.

Insufficient drying time for the ink, resulting in incomplete curing of the ink, leads to poor adhesion.

Improper printing process parameters, such as excessive printing speed or insufficient printing pressure, can also lead to poor adhesion.

II. Solution

To address these issues, the following measures can be taken to address poor adhesion of screen printing ink:

Choosing the appropriate ink and substrate:

Select an ink that matches the substrate material and characteristics to ensure effective adhesion.

If necessary, pre-treat the substrate, such as sanding or cleaning, to increase its surface energy and enhance ink adhesion. Cleaning the substrate surface:
Use a cleaning agent to thoroughly clean the substrate surface to remove oil stains, dust, and other surface deposits.
Choose the appropriate cleaning agent to avoid damaging the substrate.
Adjusting the ink drying time:
Adjust the ink drying time based on the ink characteristics and substrate material to ensure complete curing.
For inks that dry too quickly, add a retarder; for inks that dry too slowly, add an accelerator.
Optimizing printing process parameters:
Adjust the printing speed to avoid uneven ink dispersion or poor printing results caused by excessive or slow printing.
Adjust the printing pressure to ensure adequate ink transfer to the substrate while avoiding damage caused by excessive pressure.
Pay attention to screen cleaning, extrusion, and mixing processes to ensure a clean screen and proper ink mixing.
Using additives:
Add appropriate additives, such as leveling agents and adhesion promoters, as needed to improve ink adhesion and printing quality.
Pay attention to the amount and method of use of additives to avoid negative effects caused by excessive or improper use. Check equipment and operations:
Regularly inspect printing equipment to ensure it is in good condition and avoid poor printing due to equipment problems.
Strengthen operator skills training to improve operational skills and ensure accurate adherence to printing process parameters.
Perform adhesion testing:
Perform adhesion testing during the production process to promptly identify and resolve poor adhesion issues.
Based on the test results, adjust process parameters or take other measures to ensure product quality meets requirements.
The combined application of these measures can effectively resolve poor screen printing ink adhesion issues and improve the quality and production efficiency of screen printing products.