Brush plating thermal spraying technology
Case: Due to the long-term use of quarto paper for printing, this machine has caused the maximum corrosion and collapse of ink and ink outside the quartet to be about 0.15mm. Overprinting is not allowed!
Because the circumferential speed of the rubber cylinder and the impression cylinder is the same when rolling, the method of reducing the printing pressure for full-page solid proofing is used one by one to determine the corrosion depth outside the four quarters by brushing and repairing. The following is a relatively complete process.
1. Pretreatment. First, use a saw blade to shovel away the long-term sludge deposited on the drum, then use a cleaning agent and acetone to initially remove the surface ink, and then use the electrochemical electric net treatment method for further treatment. Considering that the material of the roller is cast iron, and due to the long-term use, there are ink and other dirt in the molecular gaps on the surface of the cast iron, so the activation liquid No. 2 and No. 3 are used to activate twice for the next step of plating.
2. Brushing the entire cylinder for the manual disc printing machine. The overall brush plating is to make the plating layer on the drum as a whole, and reduce the connection of the plating layer, thereby reducing the problems that may be caused by the combination between the two plating layers. Plated until the full-page solid proof has no pits.
3. Repair to geometric accuracy range. First use profiled tiles, red powder to find the high point of the plated roller, then use oil stone and water sandpaper to grind off the higher part, and repeat until the four rollers are "smooth and synchronous" beating with a magnetic meter Within 0.05mm, the large surface is slightly beating within 0.02mm, use the full version to proof the four-color sample, and the ink color is uniform. Because the four-fold part is overprinted with the grid version, so there is no difference between the overprint and the four-fold after the repair. (This example excludes other causes that cause inaccurate overprinting of printing presses, other reasons are not discussed in this article)
This process accuracy is much higher than the above method. At present, this technology still needs to be done by a professional maintenance department. The cost is relatively high, but it is still more advocated for the process requirements of the printing press.
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