What Is The Reason Why Printing Patterns Frequently Appear Offset And Ghosted?

The printing pattern of the screen printing machine appears offset and ghosted, which is usually caused by a combination of factors such as unstable substrate transportation, loose screen fixation, uneven scraper pressure, etc. It can be checked in the following order:

Troubleshooting key causes

The conveying of the substrate is unstable: Check whether the tension control of the feeding and receiving systems is normal. If the printing substrate (such as PET film, paper, etc.) slips or jumps during the printing process, the pattern position will shift and ghosting will occur.

The screen is loosely fixed: Check whether the screen is firmly installed. If the screen shakes or shifts during the printing process, it will directly cause ghosting of the pattern.

Uneven pressure on the scraper: Check the pressure adjustment device of the scraper to ensure that the pressure on the scraper is uniform and stable. Unstable pressure can lead to inconsistent ink transfer, build-up or drift.

Speed ​​mismatch: Confirm whether the printing speed matches the substrate conveying speed. The speed difference between the two will also cause pattern deviation.

solution

Adjust tension control: To solve the problem of substrate slipping, the tension needs to be readjusted to ensure smooth transportation of the substrate. If the tension control system is faulty, it needs to be repaired or replaced in time.

Tighten the screen device: Recheck and tighten the screen, and replace the screen"s fixing device if necessary to ensure that it does not move during printing.

Calibrate squeegee pressure: Check and calibrate the squeegee pressure regulator to ensure it maintains constant pressure throughout the printing process. If the scraper is worn or deformed, it is recommended to replace it directly.

Synchronized printing speed: Reset the printing speed to accurately match the conveying speed of the substrate, eliminating the speed difference between the two