In thepuzzle books printing wholesale, often appear out of the situation, the so-called out of the version refers to the printing plate on the graphic fat decline, so that the layout of the ink is weakened, the dot area becomes smaller or even lost; Paste version refers to the expansion and deformation of the layout dot area, the ink is glued to the blank area to thicken the impression, the ink is adhered to the blank part, and the printed image is blurred. So what is the reason for the missing plate in printing?

First, the pH of the moistening solution is too strong

If the acidity of the moistening solution is too strong, it will corrode the plate sand, destroy the hydrophilic layer of the plate, and it is easy to wear off the printed images in the press printing process, and the PH value of the moistening solution is just about 5.

Second, the ink viscosity is too large

If the viscosity of the ink is too large during the offset printing process, in addition to making the ink transfer difficult, it will also destroy the conditions of the middle fracture of the ink layer, so that the remaining ink layer of the layout is insufficient, and the result is that the printing plate graphic part is exposed and worn, resulting in the loss of the plate.

Three, the ink roller aging

After the ink roller aging, the hydrophilicity is enhanced, and the performance of the ink is weakened, the performance of the ink transfer is poor, in the process of mechanical rolling, the formation of "oil in water" type of ink emulsification, and finally lead to the printing plate greasy and the puzzle books printing wholesale graphic part of Wuhan.

Fourth, equipment aging

When the equipment is used and aged, some key components are poorly lubricated, resulting in wear and loosening, such as drum shaft head, bearing bush, gear components, eccentric sleeve, etc. Then, the cylinder in the process of pressing, it is easy to produce a trace of vibration or sliding phenomenon, which intensifies the friction and wear of the printing plate, resulting in the extrusion deformation in the process of imprinting transfer indirectly caused by the phenomenon of plate, paste plate.

Five, the rubber cloth is not smooth

When the padding of the rubber blanket is uneven or the bag is not tight, the surface of the bulge phenomenon occurs, and abnormal friction occurs during stamping and damages the plate film layer, resulting in the phenomenon of plate dropping and paste.

Six, the layout water size control is improper

If the layout moisture is too large, will make the layout and ink roller with a thick water film, and then affect the normal uniform transfer of ink and coating, so it is easy to cause the phenomenon of plate; And the layout moisture is too large will also make the printing ink color is light, if blindly increase the amount of ink to increase the ink concentration, it will cause excessive emulsification due to large water and ink. If the layout moisture is small, it can not compete with the ink, so that the layout ink layer spread, will also cause the paste phenomenon.

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