This article sorts out the printing plate causes and treatment methods of common quality problems for your reference.
1. Concave layout
the reason:
1. Excessive patching after drilling and repairing of plate cylinder;
2. Bruise during use.
Approach:
Copper can be repaired and polished by hand if the area is small, and it must be ground if the area is large)
Second, trachoma, crack
the reason:
1. Defects of the steel plate itself:
2. Welding joints and plug welds
Approach:
Rework
Three, layout pattern
phenomenon:
The horizontal, vertical and diagonal grains, wood grains, and wavy grains carved by electric carving, and the frequency of engraving are 8100, 3200, and 1700.
Approach:
Abrasive vibration pattern
4. Overprinting is not allowed
the reason:
1. The mechanical precision of the plate cylinder is not enough, and the ellipse, slightness, dynamic and static balance do not meet the standard, deformation, etc .;
2. The increment of the printing plate cylinder does not meet the requirements.
V. Color difference
the reason:
1. Electric engraving injection, dragging (electric engraving needle scratches the layout, similar pattern but no dots) causes the net value to change
2. Uneven grinding of copper layer
Approach:
Remastered printing plate.
Sixth, chrome layer hair
the reason:
1. Poor conductivity of the chromium layer leads to changes in the net value;
2. Problems in operation, process and plating solution lead to uneven brightness of the chromium layer.
Approach:
Deplating
Seven, scraping ink, knife wire
the reason:
1. The outlet is too deep, the electric carving needle scratches the copper layer;
2. The copper layer is rough;
3. The roughness of the chrome layer is too high or too low.
8. Corrosion
the reason:
1. Improper use and maintenance of printing plate cylinder;
2. Sun and rain;
3. The solution contains chloride ions;
4. Cleaning is not clean during chrome plating;
5. Impurities in the plating solution;
6. Residual chromic anhydride.
Approach:
Stripping or remaking
Nine, water lines
the reason:
The layout is not wiped clean, causing the dark tone in the pattern to be unrealistic and arranged like small drops of water.
Approach:
Edition
10. Copper point (feeding path)
phenomenon:
Lateral needle-shaped, linear, and pit-shaped with bright spots on the tail.
the reason:
1. The plating solution is contaminated by dust and organic matter;
2. Defects in the steel body.
Approach:
Retreat.
11. Watermark
the reason:
Dirty water that was not wiped away by chrome polishing.
Approach:
Wipe clean.
12. Grinding channel (uneven)
the reason:
1. The grinding wheel inclination angle setting is unreasonable during the copper layer grinding process, and the cutting parameters do not match;
2. Wash the plate and check the copper layer after stripping. The grindstone is too deep.
Approach:
Remake.
Thirteen, dirty
phenomenon:
Irregular tail trails, easy to appear in the full version of small mosquitoes.
the reason:
The layout is not cleaned.
Approach:
Wipe version.
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