6. Ghosting due to abnormal working of the drum pressurization When the parts related to the roller clutch pressure are not adjusted or due to wear, a certain difference in position occurs at each pressurization, resulting in ghost images with different positions. In this regard, as long as the recalibration and adjustment of the clutch-compression mechanism and the repair of the worn-out parts are performed, the drum-disengagement-pressing work will be accurate, coordinated and uniform, and such failures will be eliminated.
7. Grasp the ghost caused by insufficient paper pressure.
When the roller teeth are worn and deformed due to wear, the force exerted on the printed sheets during the imprinting is insufficient, so that the printed sheets slide out of the teeth in the imprint during the imprinting, and the amount of each slip is not the same. At one time, the ghosting of the fistula area occurred due to the fact that there was no accurate overlap between the blurred blots retained on the blanket and the retransferred ink. In this regard, it is necessary to check the teething of the drum. If unevenness or insufficiency occurs due to deformation, the moment should be adjusted again. If the crepe lines are worn and the edges are not tight, remove the new accessories to ensure that the paper edges do not slip and the ghosting faults can be eliminated.
8. Ghost caused by loosening of roller gear or bearing When the printer has been used for a long time, the maintenance and repair work has been seriously implemented for a long time, resulting in serious wear of the roller gear or bearing, inevitable vibration in the imprinting process, imprinting ghost It will follow. In this regard, after the worn parts should be repaired, the fault can be eliminated.
9. Difficulties caused by the lining discomfort of the roller When the lining diameters of the plate cylinder and the blanket cylinder are too large, the speed difference and friction occur due to the inconsistent line speed at each imprint, which causes the surface of the blanket to be misaligned. Deformation, and easy to move the liner material until wrinkles, blotting ghosting failure also followed. In this regard, the center distance of the drum should be re-measured, and the thickness of the lining should be controlled according to the specifications of the equipment, and the roller line speed should be kept consistent to avoid the occurrence of ghosting and ghosting.
Second, the analysis of horizontal ghosting analysis and elimination methods 1. Bad ghosting caused by poor quality When the paper surface is uneven, starting from the edge of the negative situation, the embossing process of paper elasticity, the paper from the bow Scratches on the surface of the blanket cause ghosting problems. In this regard, it is appropriate to knock the paper on the surface as appropriate, or to knead and knead the uneven paper surface to promote flattening of the paper surface, in order to achieve the effect of eliminating partial paper surface print ghosts.
2. Ghosting caused by poor lining When the lining material inside the lining pad is too large or underfilled, as well as local hollowing out, it may easily cause the occurrence of partial horizontal ghosting. In this regard, the rubber lining should be re-arranged and wrapped. After eliminating the bad conditions, the failure can be eliminated.
3. Ghosting caused by axial cylindricity movement When the roller's thrust bearing wears out, or if the thrust bearing screw is loosened, it will be easy for the roller to slip during the embossing process, leading to imprinted lateral ghosting. In this regard, the degree of wear of thrust bearings should be checked and appropriate measures taken to repair them. If the roller thrust bearing is loose, the nut should be tightened and the screw tightly tightened to prevent loosening. This can be eliminated.
4. Heavy backlash, ghosting caused by loose meshing When the gear wear is severe, it will inevitably produce shaking phenomenon in the imprinting process, so that the previous and next times of the imprinting can not be accurately superimposed, thus resulting in horizontal ghosting. There are even cases where longitudinal ghosting occurs at the same time. In this regard, appropriate repair and adjustment measures should be taken to reduce the backlash of the teeth and reduce the center distance so that the gears can maintain a good meshing state and eliminate ghosting failures.
In short, there are many reasons that cause the ghosting ghosting problem. As long as we are good at observing and analyzing the fault phenomenon in production practice, we can deal with such faults quickly and well to ensure the quality of product printing.
Imprint ghosting several faults (below)
January 26 18:12:31, 2019
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