Pollution in the printing process
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The "contamination" of the rollers and prints during the printing process is often caused by holes and chamfers on the paper. A hole is a small hole that passes through a paper surface that is visible to the naked eye under the illumination of light. The big hole is called the hole. Paper with holes will have a problem with the quality of the missing pen when printing.
When there are large holes or holes in the paper, the ink on the printing plate or blanket cylinder is transferred from the hole to the impression cylinder, so that the impression cylinder continuously transfers the ink to the other side of the print while continuing to rotate, resulting in Damage to the prints.
When the ink is transferred to the impression cylinder, if the ink viscosity is high, the paper will be bonded at the same time on both sides and torn off. The torn piece of paper sticks to the rubber roller or the plate, and the printing failure caused by the above-mentioned shredded paper may also occur.
The folding angle means that one corner of the printing paper is folded back, and the folding angle also causes serious printing failure. The folding angle can be divided into two types: dead angle and live angle. When the paper with the chamfer is printed, one piece of the printed matter printed on the sheet of paper is not printed, and one piece is printed on the back side.
In addition, the ink is also transferred to the impression cylinder at the corner portion, causing the impression cylinder to continuously contaminate the back side of the print, resulting in a lot of waste. More seriously, if the paper is thick and hard, the folding angle may damage the blanket, forcing the machine to stop changing.