In order to ensure the stability of printing quality, the operator must carry out sampling inspection of the printed products, make judgments on the changes that occur, and adopt corresponding adjustment measures to avoid the occurrence of printed matter. The following are several types of faults that often occur during the printing process.
1. Blocking. Blockage of the dots will cause the amount of ink to transfer to decrease, and the color of the print will change. In the event of blockage, the plate should be cleaned with a solvent or a special cleaning agent, and appropriate measures should be taken for the cause of the blockage.
2. The plate is worn. The wear of the printing plate will make the dots smaller and lighter, thus affecting the amount of Offset Printing Ink carried by the dots. The result of plate wear is that the overall color fades. At this point, the production should be stopped and the old version should be re-plated. If the plate cylinder is collapsed using a transitional mesh wall, it cannot be deplated and must be reworked.
3. The pattern colors are inconsistent. When multiple patterns are arranged at the same time in the horizontal direction, the colors of the left and right sides of the printing plate may be inconsistent. Therefore, check the difference in printing effect between the left and right ends of the plate cylinder.
4. Printing environmental factors. If the room temperature of the printing shop changes greatly, the flow state of the Heatset Soy Based Printing Ink changes. The temperature and temperature of the general production workshop are controlled at a temperature of (23 ± 5) degrees Celsius and a humidity of 60% ± 5%. In addition, when using ink in winter, it is necessary to preheat in advance to increase the fluidity of the ink.
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