Reasons for deviation in printing accuracy
1. When making multi-color overprint (halftone printing) screens, the screens are dried at different temperatures, thereby causing errors in printing accuracy .
2. The screen has low tension or overprint (halftone) screen tension.
3. Drying with hair dryer, screen drying uneven.
4. The use of too old, unsturdy, and distorted mesh-plate making results in deviations in the printed image due to poor stability of the frame (these problems can be detected with negatives)
5. When multi-color printing, the net distance is not used.
6. Squeegee deformation.
7. Due to some factors, the size of the substrate has changed
Causes of moiré
1. Mismatching of halftone printing screens and screen meshes (the number of screens should be 2.5, 3.75 or 6.25 times the screen).
2. There is an error in the angle between the halftone printing screen and the screen line.
3. The RZ value is too high (should be less than 8).
4. The template is too thick or too thin.
5. Compared with the wire diameter, too small dots will be lost (the dot range should be 5-95%).
Cause of color change
1. The consistency of the ink changes (different viscosities) due to evaporation of the solvent.
2. Change the squeegee angle during printing.
3. Change the scratch hardness in the printing process.
4. Change speed during printing.
5. Scratched edge damage.
Causes of premature stencil damage
1. Insufficient rubber grease.
2. Insufficient drying before exposure.
3. Insufficient exposure time.
4. The net distance is too high.
5. The ink blade is too dry and the pressure is too great.
6. Use the wrong cleaning solvent for cleaning (including a small amount of water).
1. When making multi-color overprint (halftone printing) screens, the screens are dried at different temperatures, thereby causing errors in printing accuracy .
2. The screen has low tension or overprint (halftone) screen tension.
3. Drying with hair dryer, screen drying uneven.
4. The use of too old, unsturdy, and distorted mesh-plate making results in deviations in the printed image due to poor stability of the frame (these problems can be detected with negatives)
5. When multi-color printing, the net distance is not used.
6. Squeegee deformation.
7. Due to some factors, the size of the substrate has changed
Causes of moiré
1. Mismatching of halftone printing screens and screen meshes (the number of screens should be 2.5, 3.75 or 6.25 times the screen).
2. There is an error in the angle between the halftone printing screen and the screen line.
3. The RZ value is too high (should be less than 8).
4. The template is too thick or too thin.
5. Compared with the wire diameter, too small dots will be lost (the dot range should be 5-95%).
Cause of color change
1. The consistency of the ink changes (different viscosities) due to evaporation of the solvent.
2. Change the squeegee angle during printing.
3. Change the scratch hardness in the printing process.
4. Change speed during printing.
5. Scratched edge damage.
Causes of premature stencil damage
1. Insufficient rubber grease.
2. Insufficient drying before exposure.
3. Insufficient exposure time.
4. The net distance is too high.
5. The ink blade is too dry and the pressure is too great.
6. Use the wrong cleaning solvent for cleaning (including a small amount of water).
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