Imbalanced Printing Pressure

The amount of silicone rubber in the pad printing machine must not be insufficient; different silicone rubber materials have varying pressure requirements. The aging and hardening of silicone rubber can also lead to uneven printing pressure, causing the ink to not transfer completely onto the material. Inspection and replacement of the silicone rubber are necessary during use; in addition, the surface of the pad printing machine should be kept flat to ensure even ink distribution.

Printing speed too fast

High printing speeds can lead to insufficient time for the ink to adhere to the material, resulting in difficulty in scraping it clean. Therefore, when using a pad printing machine, adjust the printing speed to an appropriate level to ensure that the ink can fully adhere to the surface of the material.

Incomplete printing plate cleaning

If there is any residual ink or debris on the printing plate surface, it will weaken the ink adhesion, leading to difficulty in cleaning. Therefore, it is necessary to clean the printing plate thoroughly before use, and use specialized cleaning solution to enhance the cleaning effect.

Four: Weak adhesion of ink

The viscosity and stickiness of the inking oil can affect the ink's adhesion. If the ink's adhesion is weak, issues like smudges that won't clean off may occur. Therefore, it's necessary to test the ink before use to ensure its quality meets the requirements.

In addition to the aforementioned situations, other factors can also affect the inability to cleanly remove ink, such as environmental humidity and temperature. If you encounter issues with ink not being fully removed, consider slowing down the printing speed or increasing the printing pressure. Furthermore, you might consider switching to different colored inks or replacing the printing plate as methods to resolve the problem.

It's a common issue that the ink on offset printing oil can't be wiped clean, but the specific reasons may vary, and require a detailed analysis. By conducting timely inspections and maintenance, and implementing appropriate adjustments based on the specific situation, this problem can be effectively resolved.