Optimized color carton printing process technology (below)

Product Overprint Accuracy Control

When the roller teeth have foreign body or tooth surface wear; insufficient bite force or open teeth discomfort; positioning device wear, loose, so that the work is not normal; guide roller pressure is inconsistent or the conveyor belt elastic is not the same; the thickness of the lining discomfort or looseness of the situation Printing pressure is too heavy or the cardboard is not properly handled; paperboard is uneven or the edge of the paper is wavy; the fountain solution or ink coating volume is too large and will affect the overprint quality of the product. Therefore, in order to improve the overprint accuracy of the product, Pay attention to the serious inspection and control from the above several links, and take appropriate measures to handle the problems in time.

Reasonable control of printing pressure

Doing a good job of printing pressure control has a very important significance for improving the printing durability of printing plates, preventing the printing quality defects of pasting plates, dirty plates, and off-type printing, and ensuring the clarity of printing. Special lithographic and flexographic printing processes must use lighter pressures for printing, and the flatness of the pads should be better. Partial dents should be locally padded, and adjustments must not be made in a fully blind manner. When the pressure is adjusted, the ink should be gradually lightly weighted in the case of the normal amount of ink to be applied, so as to avoid the lack of ink to cause the print to be unclear and increase the pressure.

Selection of ink and control of deployment process technology

Color carton paper printing, to use good fineness, moderate dry ink printing, different types of ink should not be mixed to adjust the use, to prevent the PS plate film layer appears abnormal damage, to avoid dirty version, paste version, out of print Such as the production of print quality defects. For large-area spot color printing, the “deep ink thin printing” process should be used for printing, that is, the hue of the ink should be appropriately deepened so that the ink layer can be thinned during printing. This will not only meet the requirements of printing hue, but also be effective. Prevent the occurrence of printing defects such as dirty, paste, and blotting.

Put the good printing "three times" off

After the calibration work is completed, although the printing pressure and the ink coating amount have been adjusted normally, due to various variability factors in the printing process, such as changes in ambient temperature and humidity, ink thixotropic, and the quality of the base paper Unstable, unexpected equipment failures, etc., may affect the stability of the printing quality. Therefore, a skilled operator, a print operator with a certain level of production experience and a strong sense of responsibility, will always perform sampling inspection during the printing process. The ink in the ink fountain is frequently stirred to observe the water in the layout. This is an important control measure for improving the printing quality and production efficiency, and it is also a reliable guarantee for effectively preventing printing quality failures. By properly printing the "three services", the ink balance of printing can be well maintained, and the hidden dangers of printing quality can be discovered in time so that preventive and corrective measures can be taken in time to reduce the production of defective products and improve the pass rate of printing.

Remove paper powder printing process technology control

Due to the increasingly fierce market competition, the small profits in the carton industry are gradually emerging. It is an objective situation that it is difficult to use high-quality base paper for the packaging of general products. Some medium- and low-grade base papers are often prone to powdering due to poor surface strength. , Loss of hair and other quality defects, but also easily lead to paste version, dirty version and off the printing chain failure, seriously affecting the production efficiency and product quality. In order to reduce or avoid the occurrence of these problems, the use of multi-color printing press surplus color printing group, in the machine's first two color groups, the first paper to water, air imprinting, can better overcome and make up the quality of the original paper Poor defects effectively reduce or eliminate powder, lint, and ink quality problems.

Correct maintenance and adjustment of the machine

The machine is an important factor in determining the level of productivity and product quality, as well as the source of printing quality. Therefore, we should always pay attention to strengthening the maintenance of the machine, the key parts of the machine, such as the pair of paper-feeding teeth, pull gauge, front gauge, tooth The relevant parts of the row, drum shaft, etc., should be strictly in accordance with the specifications of the equipment to do a good job of smoothing and maintenance, to prevent the wear and looseness of the vital parts caused by overprinting failure. It should be noted that the machine is often inspected and problems and hidden dangers are discovered and measures are taken to deal with them in time. Through careful maintenance of the equipment, the accuracy of the machine is maintained in a good state. In addition, the correct adjustment of the machine is also to improve the quality of product printing, can not ignore the operating technology links. The practice of production process shows that the thickness of the lining of the drum must be controlled strictly according to the parameters of the equipment specification, and the cushions, blankets and printing plates should be tightly secured. The pressure of the teeth of the roller should not be too small; the volume of mouthwash should be kept reasonably small. The use of worn teeth, tooth pads should be replaced with new accessories in a timely manner; the printing speed of the entire batch of products must be consistent, the printing speed can not be too slow or too fast. In this way, the overprint accuracy of the product can be better guaranteed.

In summary, optimizing the production technology of colored cartons involves all aspects of the entire production process. Therefore, as long as we strengthen the strict control of production technology, scientifically and reasonably formulate a flexible and standardized production process, and pay attention to From the design of the former to the control of the production process; from the use of raw materials to the operation of the equipment; from the production process to the printing operation technology; from the production of semi-finished products to the inspection of finished products, systematic control is performed in an orderly manner, which can not only effectively reduce various printing defects The chance of happening, but also can increase the production efficiency and the quality of the product synchronously.