PS version common faults and treatment methods
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Upper dirt
1) Insufficient development
2) Inappropriate gluing
3) The water roll is too dirty
4) The ink is too soft (lean) / multi-fat.
5) Oxidation: When water or ink is applied, ink spots appear on the surface of the plate. The version is "too dry." The version absorbs ink from the water roller
6) Dirty in printing: insufficient glue in dampening solution
7) Dirty bars around the drum: Check the dampening system / ink roller
Image is poorly inked, graphics are not inked
1) The picture is partially glued too sticky
2) Excessive use of the surface cleaner
3) Dampening solution
4) The ink lacks moisture resistance and should be replaced with ink
5) Plate and rubber roller pressure is too large
6) Excessive concentrations of fountain solution or alcohol are used
Paste
1) Ink emulsification
2) Incompatible ink and dampening solution
3) There is detergent or detergent on the dampening roller
4) Improper setting of water roller
5) Dampening solution reacts with paper
Version wear, graphics prematurely destroyed
1) Excessive exposure
2) The roller liner is too much, the ink roller setting is too large
3) Edition cleaner, solvent or blanket cleaner is not compatible
4) The roller or blanket is too hard
5) Corrosive ink
Printed version cracking
1) Loose plate on the drum
2) The version is folded or improperly installed
3) The wrong direction of the sand direction
4) Edition pad sliding
Dot increase
1) Underexposed or underdeveloped
2) The film is not in good contact with the plate.
3) The ink supply is too large
4) The version or blanket pad is too thick
5) Ink roller setting is too hard
6) The fountain solution is too weak
Dot loss
1) Overexposure or overexposure
2) The film is not in good contact with the plate.