Common offset ink failure causes and treatment methods (2)

Third, crystallization
Phenomenon, when overprinting on the dry ink, it is possible that the overprinted ink will not be overprinted, and even if it is barely printed, the pool can be easily wiped off.
Reason: This is due to the fact that the first printing ink contains too much desiccant, the ink dries too quickly, the interval between printings is too long, and the surface of the ink film is formed by a smooth dura mater, which makes it difficult to ink the next color ink.
Approach:
(1) A reasonable understanding of the interval between overprints is obtained by printing a color ink before the previously printed ink is completely dried.
(2) reduce the amount of desiccant in the ink, slow down the ink drying speed.
(3) If crystallization has occurred, remediate it by printing a resin binder or a 05-90 bright paste.
Fourth, dirty
Phenomenon: When the printed matter is printed on the front side, the front side of the printed matter is stacked and the back side of the printed matter is overlapped and called dirty.
the reason:
(1) The fixing and drying of the ink are slow.
(2) Ink is too large.
(3) The paper surface is relatively tight and smooth and has poor absorption. Ink cannot penetrate and stick quickly on the surface of the paper.
Approach:
(1) Change to fast fixing type ink.
(2) Use thin layer printing with high-density ink.
(3) Take the surface dusting method.
(4) Add 59 anti-adhesion agent or six grain flour to the ink.
5. Stacking ink
Phenomenon: refers to the accumulation of ink on the blanket, plate and ink roller, poor transfer of ink transfer, so that the printed ink is blurred.
the reason:
(1) The ink is too short and lacks fluidity.
(2) High pigment content, coarse particles, large specific gravity, insufficient grinding, insufficient wetting.
(3) The viscosity of the ink and the binder is low, and milkiness occurs with the fountain solution.
(4) The paper powder is peeled off and mixed in the ink to make the ink shorter.
Approach:
(1) Add a water-resistant resin binder that can make the ink longer.
(2) Change the pigment with high concentration and reduce the amount of pigment and solids to re-roll the ink.
(3) Minimize the amount of fountain solution.
(4) Add some 05-92 detackifying agent to reduce viscosity. Replace paper if invalid.

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