Offset roller surface repair solution
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Brush plating thermal spraying technology
Case: Due to the long-term use of four-open paper printing, the machine has a maximum corrosion of 0.15mm due to the corrosion of the ink, and the overprint is not allowed!
Because the circumferential speed of the blanket cylinder and the impression cylinder are the same, the method of reducing the printing pressure to the whole plate is used successively, and the corrosion depth of the four openings is determined based on the four-in-one ink color sample, and the plating is performed and repaired. Below is a more complete process.
1. Pretreatment. First use the saw blade to remove the long-term deposited sludge on the drum, then use the cleaning agent, acetone to initially remove the surface ink, and then further treatment by electrochemical net treatment. Considering that the drum material is cast iron, and due to long-term use, there is dirt such as ink in the molecular gap of the cast iron surface, so the activation solution of No. 2 and No. 3 activation liquid is used twice for the next plating.
2. The whole plate is coated with a roller for the manual disc printing machine. The overall brush plating is to make the coating on the drum as a whole, which reduces the connection of the coating, thereby reducing the problems that may be caused by the combination between the two coatings. Plated to the full version of the field proofing without pits.
3. Repair to the geometric accuracy range. First use the contour tile, red dan powder to find the high point of the roller plating, and then use the oil stone, water sandpaper to grind off the high part, repeat, until the four rollers "circle smooth and synchronous" beating with the magnetic force meter Within 0.05mm, the large surface is slightly beaten within 0.02mm, and the four-color sample is proofed in the full version, and the ink color is even. Because the four-part part is still printed with the grid version, there is no difference between the overprint and the four-opening after the repair. (This example excludes other reasons that cause the press to be overprinted. Other reasons are not discussed in this article)
This kind of process precision is much higher than the above. At present, this technology still needs a professional maintenance department to do it, and the cost is relatively high, but it is more recommended for the printing machine process requirements.