Ghosting refers to the appearance of silhouettes or ghosting around printed graphics, which can be divided into axial ghosting and circumferential ghosting according to different directions. The axial ghost is at a small angle to the drum axis, and the circumferential ghost is perpendicular to the drum axis. The causes of several ghost failures are described below.
1. The blanket is not stretched tightly, causing full version or partial circumferential ghosting, which is divided into two cases.
(1) The blanket is not stretched as a whole, so that the blanket cannot be reset in time after being pressed, causing overall ghosting.
(2) The blanket is cut or skewed, causing partial tension and causing partial ghosting. At this time, the problem can be solved by tightening the blanket or reinstalling the blanket.
2. The pressure of the roller is too large, causing an overall circumferential ghost image. The cylinder pressure should be adjusted according to the thickness of the printing paper.
3. The overprint paper does not dry, causing ghosting of the top ten sheets of paper. The direction of this ghosting is not fixed and will become lighter and weaker.
4. Uneven paper and uneven moisture content cause local ghosting, and the position is not fixed, sometimes no, sometimes light and heavy.
5. The printing plate is not tightened or cracked at both ends of the mouth, resulting in full-page or partial circumferential ghosting.
6. Two-color machine impression roller gripping tooth pad is lower than the surface of the roller, the impression roller gripping the paper gripping the paper, the paper can not be close to the roller after the gripping mouth of the impression roller. After imprinting with the first-color blanket, most of the arch disappears. When the second-color blanket is imprinted, there is still a small amount of arch. Due to the slight difference in arch, sometimes it cannot be the same as that on the first-color blanket The dot prints completely overlap, causing ghosting.
7. The pressure force of the gripping roller gripper is too small and uneven, the gripper and the tooth pad are seriously worn, too smooth, or the amount of ink is more than one color, and the viscosity is large, so that the paper moves in the gripper. Due to the different amounts of movement, the dots of the two-color blankets cannot overlap, and ghost images appear.
8. The gears and bearings of the drum are worn, and the gap becomes larger. When the machine is suddenly loaded, the drum is ghosted due to vibration. In addition, if the roller bearing is loose, the thrust bearing is not locked, etc. will also cause ghosting.
There are many reasons for ghosting. If you encounter ghosting problems, you should first analyze the type of ghosting, find the cause according to its type, and eliminate the fault.
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