The reason and countermeasures of the offset ink rotation fault (1)

· Flying ink:

Phenomenon: The ink scattered in the mist between the ink rollers to pollute the surroundings.

the reason:
<1> The ink is too thin and its viscosity is not suitable.
<2> The ink supplied to the ink roller is too thick or the oil film of the ink roller is not uniform.
<3> Static electricity occurs.

Countermeasures:
<1>Adding a wax additive to make the ink shorter and sticky.
<2> Reduce the ink supply and adjust the ink roller pressure to make the film uniform.
<3> Humidification.

·Air drying:

Symptoms: The ink dries on the fountain or roller.

the reason:
<1> The room temperature is too high and the printer's temperature is too high.
<2> The solvent in the ink is too volatile or there is less drying inhibitor in the ink, and the ink is not suitable.

Countermeasures:
<1> Decrease the room temperature and reduce the circulating water temperature of the printing roller.
<2> Replace with new ink.

·Ink roller deinking:

phenomenon:
Insufficient ink transfer, print density reduction, metal transfer roller on the printer exposed white.

the reason:
<1> The ink has poor water resistance.
<2> The printing water supply is too large and the ink and ink balance is out of balance.

Countermeasures:
<1> Add anti-water additives to the ink.
<2> Reduce the water supply and adjust the ink balance.

·Ink deinking:

phenomenon:
The ink is separated from the ink in the ink fountain, the ink transfer amount is insufficient, and the print density is reduced.

the reason:
<1> The ink does not have good fluidity.
Countermeasures:
<1> The ink in the fountain is often stirred to maintain its proper fluidity.
<2> Replace the ink with good fluidity.

· Pulling paper

phenomenon:
The print has white spots or a printing roller to tear the paper off.

the reason:
<1> The ink viscosity is too high.
A. The ink itself has high viscosity.
B. The temperature of the printer is too high to make the ink solvent volatilize and the viscosity of the ink is increased.
C, printing room temperature is too low, low ink temperature makes the ink sticky.
<2> The printing roller has too much pressure on the paper.
<3> The paper strength is not good.

Countermeasures:
<1> Reduce the viscosity of the ink.
A. Add a suitable amount of high-boiling solvent.
B. Reduce the temperature of the printing solution and the ink roller circulating water to cool the printer.
C. Raise the room temperature or preheat the ink at standard room temperature.
<2> Adjust the printing roller pressure.
<3> Replace the stronger paper.

(to be continued)