General printing problems and solutions
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Good quality
Dots, lines, solid on the ground; background, blank part of the line is clean; overprinting is accurate, no over the bottom
Gray pattern
Insufficient or unsuitable ink; too much water, the pressure between the plate and the plate is not correct, the pressure between the plate and the rubber or rubber and the pressure roller is insufficient
Stain
Too many dots, insufficient water, unclean water rollers, and the water roller is too tightly tied at both ends, and may also oxidize.
The pattern is gray and the background is stained.
The ink dot or the rubber is shiny, and the pressure of the water roller or the ink roller is too large. The gloss generally occludes the varnish or the water is not clean during the cleaning process.
Paper curl
There is too much water and the paper itself curls.
The paper is not clipped
Front gauge or paper table runner adjustment error
There is a pinch on the edge of the mouth
The front gauge is too high and the transfer table is not adjusted. This usually occurs when the cover is printed. Due to the different thickness of the paper, the front gauge should be lowered.
Wrinkle
Too much water, the paper is damp, the paper table is not adjusted, and the pressure between the rubber and the impression cylinder is too high.
Off-page (because there is a film on the surface of the plate)
The pressure of the plate water roller or the ink roller is too large; or the two ends are strongly rolled, and the pressure between the plate and the blanket cylinder is too large.
Imprinting is not allowed
The front side gauge, the swinging teeth are not adjusted well; the edges of the paper are not at right angles, and the blanket is loose.
Ink roller printing
The pressure of the plate roller is too large, the pressure between the plate and the rubber or the rubber and the impression cylinder is too large, the rubber cloth is loose, and the ink is not suitable.
No pattern
Insufficient pressure, too much water; ink roller and blanket are shiny.
The pattern is too dark
Too much ink, too much pressure, the ink is stored on the plate and the blanket.
Double shadow, blur
The version is loose with the blanket, too much water and ink; the pressure between the plate, the eraser and the impression cylinder is not accurate, and the clamp of the conveyance roller is out of alignment.
Unevenness of cleanliness
The ink is unevenly distributed; the parallel pressure between the water roller and the ink roller is uneven; the parallel pressure between the rubber and the impression cylinder is uneven; the ink roller is shiny, the paper is poor; the impression cylinder has dry ink; in this case, the water roller is re-cleaned. Roller.
Weak network
The rubber has a concave hole, the layout is eroded, the pressure between the plate, the eraser and the impression cylinder is insufficient, and the ink viscosity is too strong to stick the paper. Use syrup: thinner, Blanker restorer rubber recovery agent