Most of the overprint errors are common defects in gravure printing. The phenomenon is that each color can't overlap completely in the multi-color overprint process, and there is a certain error.
The first aspect: personnel quality
Because of the objective existence of register error, it requires employees to have a strong working ability. Printing is a meticulous work, we must be attentive, careful and responsible. Self inspection, self inspection, multi observation and timely discovery of problems should be done.
The second aspect: equipment factor
The accuracy and performance of the whole equipment, the tension control of overprint, the coordination of heating and air supply system, imprint rubber roller, plate roller, plate shaft, guide roller and other systems determine the temperature, pressure, parallelism, elongation, coiling, etc., while the register system itself limits its accuracy.
Plate roller increase is not appropriate, easy to produce longitudinal register is not accurate, imprint roller rubber deformation, lack of elasticity. Keep the press roll in good condition.
The third aspect: operation technology
The tension setting of the substrate is unreasonable. If the tension is too small, the substrate is loose, and the color registration in both vertical and horizontal directions is not correct; if the tension is too large, the transverse shrinkage of the base material and the longitudinal color registration are unstable, the tension should be adjusted accordingly.
The temperature is not suitable, especially the temperature of the oven is too high and the temperature of the cooling roller is too high, which makes the film deform. For the film that is not smooth, the temperature of the preheating box should be appropriately increased.
The imbalance of the inlet and outlet air volume in the oven causes the film to vibrate in the oven. The inlet and exhaust air volume should be measured by anemometer and controlled.
Version roller installation is not appropriate, such as eccentric, before the installation of the version roll, the ink on the plug must be cleaned.
The above is sorted out by Dongguan Beite packaging material Co., Ltd. Dongguan Beite packaging materials Co., Ltd. produces composite bags, roll film, fruit bags, aluminum foil bags, suction mouth bags, self-supporting bags, zipper bags, anti-static bags, special-shaped bags, etc., which are suitable for the internal and external packaging of food, daily chemicals, electronics, toys, medicine, cosmetics, industrial products and other industries.