1. The viscosity of the ink is too large
When the ink consistency is high and the viscosity is strong, the printing sheet will produce a small amount of slipping during the imprinting process, which can easily cause ghosting failures. Especially when the gripping force of the gripper is insufficient, the longitudinal ghosting is more obvious. In this regard, as long as the ink adjustment process is closed, the ink is appropriately diluted, and a little auxiliary agent is added to reduce the viscosity of the ink, which can better eliminate the ghosting of the imprint.
2. The printing plate is not tight or the "bottom pad" is not real
When installing the plate, due to lack of scientific operation knowledge, the plate tightening screws were not evenly tightened in sequence, so that the surface of the plate wrapper cylinder was uneven, there was a small amount of arching in the local area, and the back of the plate was too soft Or using more pads or less pads locally to make their critical emptiness easily cause local ghosting. In this regard, you should pass the technical operation of the plate-setting operation and the technology of the pad-making process, that is, when the printing plate package is tightened, the screw-in amount of each screw should be gradually tightened evenly in sequence, and you should never take a screw first. The child is tightened. So that the printing plate can not fully and evenly adhere to the surface of the drum. On the other hand, the padding material used for padding on the back of the printing plate should be harder and avoid local padding or hollowing out as much as possible to achieve the effect of eliminating ghosting failures.
3. Excessive printing pressure
When the pressure between the rubber cylinder and the impression cylinder is too large, the displacement of the rubber cloth will inevitably increase, so the ink can not be restored to the original state in time immediately after the ink transfer during the imprinting process, so that the imprint is accepted from the plate cylinder At that time, a slight amount of disparity was generated, forming a ghost image. In this regard, as long as the pressure on the roller is appropriately reduced and the expansion and contraction coefficient of the blanket is reduced, the failure can be eliminated.
4. The blanket is loose or drumming
When the blanket is tightened, the force is uneven, so that the local position is not close to the surface of the roller, and there is a problem of emptiness or bulging, and when the multilayer backing or foreign objects on the back of the blanket are adhered, it is easy to make Partial layout imprint ghosting. In this regard, the rubber blanket should be loosened for inspection, and the rubber blanket should be tightened again after the bad phenomenon is cleared to eliminate the ghosting failure of the imprint.
5. Improper clamping of printing plate or blanket
When the printing plate or blanket is not installed and clamped, a slight amount of looseness during the imprinting process is also likely to cause ghosting failures. In this regard, as long as you carefully check and take appropriate measures, you can eliminate the ghosting fault. 6. The roller pressure does not work normally
When the components related to the roller clutch pressure are not adjusted or are worn out? There is a certain position difference every time the pressure is pressed, which causes the imprinting position to be different, which causes ghosting. In this regard, as long as the clutch pressure mechanism is recalibrated and adjusted, and the worn parts are repaired, the roller clutch pressure work is accurate, coordinated, and unified, and such failures can be eliminated.
7. Insufficient pressure for gripping paper and teeth
When the roller teeth are worn and deformed due to use, the gripping force on the printed sheet is insufficient when gripping the paper, so that the printed sheet slips out of the teeth during the stamping, and the amount of each slip is not the same. At one time, due to the indistinct overlap of the blurred print remaining on the blanket and the ink transferred again, a ghost image of the mouth area was generated. In this regard, the roller teeth should be checked, and if the gripping force is uneven or insufficient due to deformation, it should be adjusted again. If the surface of the gripper is worn and the edge of the paper is not tight, you should remove it and replace it with new accessories to ensure that the bite does not slip on the edge of the paper, and the ghosting problem at the gripper can be eliminated.
8. Loose gear or bearing wear and loose
When the printer is used for a long time, the maintenance and repair work is not implemented carefully, which will lead to serious wear of the roller gear or bearing. It will inevitably produce vibration during the imprinting process, and the ghost image will follow. In this regard, after repairing the worn parts, the fault can be eliminated.
9. Discomfort of roller lining
When the cladding diameter of the plate cylinder and the rubber cylinder is too large, the line speed is inconsistent every time imprinting, resulting in speed difference and friction, so that the surface of the blanket is deformed by squeezing and moving, and the inner liner is easily moved Until the wrinkle, the fault of imprint ghosting also followed. In this regard, the center distance of the drum should be re-measured, the thickness of the lining should be controlled according to the requirements of the equipment specifications, and the linear speed of the drum should be kept consistent to avoid the occurrence of ghosting faults.
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