Spotted mottle
The ink printed on the substrate has dark and light tone spots.
Chalking
The ink is printed on the substrate, even though it can be wiped off after drying.
Pile of ink
The phenomenon that ink accumulates on the printing plates, ink rollers, and blankets during the printing process, making printing impossible.
Set-off
The phenomenon that the ink is fixed too slowly so that the pollution is pressed on the back of the printed product.
Crystallization
The ink is printed on the substrate because it is excessively dry, and the surface conjunctiva is too smooth, so that the post-printed ink cannot be printed completely or cannot be printed at all.
Deinking stripping
In the offset printing process, due to the imbalance of the water and ink, so that some ink is replaced by water on the ink roller and the ink does not stick to the phenomenon.
Not under ink inkretreatingfromfountainroller
In the printing process, because the ink cannot be smoothly transferred on the ink roller, the amount of ink is inconsistent or the ink is not completely discharged, so that the color tone of the printed product is inconsistent and increasingly shallow.
Floating dirty tinting
Also known as ink water, refers to the combination of the lithographic ink composition and the fountain solution, which makes the non-graphic dyeing areas of the printing plate and printed matter have a slight light color.
Greasy
The ink repellency of the non-graphic area of ​​the printing plate is not good, so that the lines and dots of the printed product are spread out and expanded, and the graphic is not clear and incomplete.
Dirty scumming
There are many ink stains in the non-graphic area of ​​the printed product.
Pasting plate
Ink that is too thick or too sticky concentrates paper particles, ink skin and other particulate impurities on the dots of the printing plate on the printing press, making the printed product blurred.
Strike-through
The ink on the printed matter penetrates from the paper surface to the back of the paper and there are often oil marks on the edges of the print.
Bleedingwhenoverprinting
The printing uses non-solvent-resistant ink. When the solvent-type varnish is used, there is a bleeding phenomenon around the print, and the dots are blurred.
Sticky page blocking
The printing uses slow drying ink, so that the printed matter is pasted into blocks.
Pinholing
The ink can not properly wet the surface of the substrate and the phenomenon of bead-like small holes appears.
Fine dots disappear imagedetaildisappearing
Due to the insufficient oiliness of the lithographic ink or the acidity of the dampening water is too large, the amount of water supply is too large, so that the fine dots in the printed matter disappear.
Poor filling
Because the engraved gravure ink is too thick, too sticky or too thin, the thin lines of the printed product are not continuous, and there is a phenomenon of disconnection.
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