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YLTpacking: Operational Technology for Improved Overprinting Accuracy of Aluminium Foil bags

YLTpacking Packaging: Operational Technology to Improve the Precision of Aluminum Foil Overprinting 1. First of all, the style and size of the design and production of the printing plate should be combined with the overprinting accuracy requirements. According to the speed of the overprinting machine, the printing pressure, the number of overprinting and many other factors, the dot depth of the color mark of the printing plate should be determined. 2. Establish standard requirements for the installation and cleaning of printing plate rollers, and achieve standardized operation of plate loading and unloading. 3. Focus on monitoring the tension changes during machine operation, and make reasonable adjustments to avoid breaking and cracking of the substrate during the overprinting process. 4. In the process of overprinting, it should be done: the pressure angle of the scraper is correct, which can reduce the contamination and scratches of the printing layer and the color mark ink; the proper adjustment of the aluminum foil tension can avoid inaccurate color registration, dot loss and printing stripe defects; master the ink viscosity and Solvent affinity, it can solve the problems of sticking back, poor color label overprinting, weak gloss and so on. 5. To enhance the sense of responsibility of the operators, it is necessary to strengthen the training and enhance the quality awareness at ordinary times. In the process of overprinting, it is necessary to sample frequently and check frequently. When the overprinting error is found, it should be adjusted in time. Problems that are easy to appear in overprinting and their solutions 1. In terms of equipment, the problem of mechanical wear is prone to occur. The cone heads at both ends of the sleeve shaft are worn; the traction roller is unbalanced; the bearing is damaged. Solution: replace the cone head; adjust the traction roller to make it balanced. 2. For the printing plate roller, the rubber roller of the printing plate has uneven pressure on the left and right ends during overprinting; the printing plate roller shaft is loose. Solution: adjust the pressure of the printing plate rubber roller to balance the pressure at both ends; re-tighten the printing plate roller shaft. 3. Problems are prone to occur in terms of process technology: unbalanced tension control of unwinding and rewinding; tension imbalance caused by operation errors. Solution: In terms of technical management, process management points should be formulated to monitor the tension of winding and unwinding, and record them; operate reasonably according to the operation method. 4. Problems in plate-making color code: The layout color code exceeds the normal error range. Solution: Remake the plate to reach the standard error. 5. Problems with raw materials: the thickness of aluminum foil is uneven, which affects the tension and causes inaccurate overprinting. Solution: Change the aluminum foil; the ink viscosity is large, which affects the overprinting accuracy, and the ink viscosity should be readjusted. 6. Subjective reasons: The operator’s sense of responsibility is poor, resulting in poor overprinting accuracy. The operator’s sense of responsibility should be strengthened to find problems and solve them in time. For more information on flexible packaging overprinting, please visit

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