1.Ghosting caused by too much ink viscosity When the ink is thick and sticky, the printed sheet will have a slight slip during imprinting, which can easily cause ghosting, especially when the gripping force is insufficient. The shadow is more pronounced. In this regard, as long as the proper ink transfer process is turned off, the ink is properly diluted, and the auxiliary agent is used to reduce the viscosity of the ink, which can eliminate the double-image ghosting failure.
2. When the printing plate is not tight or the "bottom pad" is caused by ghosting, due to the lack of scientific operation knowledge, the fastening screws of the plate are not evenly tightened in order, resulting in uneven elasticity of the surface of the printing plate. There are traces of bowing, and the back pad of the printing plate is too soft, or the use of multiple pads or pads to make it critical void, can easily lead to local ghosting. In this regard, it is necessary to close the screwing amount of each screw gradually and successively. Tighten the plate so that the plate cannot fully and evenly cling to the surface of the roller. On the other hand, the padding used for padding on the back of the plate should be harder and try to avoid partial padding or air control to achieve the effect of eliminating ghosting failures.
3. Ghosting caused by excessive printing pressure When the pressure of the blanket cylinder and the embossing cylinder is too large, the deformation displacement of the blanket will increase correspondingly. As a result, the ink transfer during the imprinting process cannot be restored to the original state in time, and thus a slight difference in position is generated when receiving the imprint from the plate cylinder, and a ghost image is formed. In this regard, as long as the drum pressure is properly reduced and the expansion and contraction coefficient of the blanket is reduced, the fault can be removed.
4. The rubber is not loose or the ghost caused by the drum. When the blanket is tight, the force is not uniform, so that the local position is not close to the surface of the drum, and there is an empty or kicking drum, and the back of the blanket is partially When layer mats or foreign materials are attached, it is easy to make local layout impressions ghost. In this regard, the rubber blanket should be released for inspection, and the bad impressions should be re-tightened to eliminate the impression of ghosting.
5. Ghosting caused by inappropriate plate or blanket clamping When the plate or blanket is not clamped, a slight loosening during the stamping process can easily cause ghosting problems. In this regard, as long as a careful inspection to take appropriate measures, you can eliminate the ghosting shadow failure.
6.Ghosting caused by abnormal working of the drum pressurization. When the parts related to the drum clutch pressure are adjusted or the sound wear occurs, a certain position difference occurs at each pressurization, resulting in insufficient imprinted positions and repair of worn parts. To make the work of roller separation and compression work accurately, coordinate and unite, this fault can be eliminated.
7. Ghosting caused by insufficient paper pressure due to insufficient paper pressure. When the roller teeth are worn or deformed, the force exerted on the print sheet is insufficient when the paper is imprinted, so that the printed sheet slips out of the teeth in the imprint. Each time the amount of slip is not the same, when this is printed once, there is ghosting in the fistula area due to the inaccurate overlap of the embossed patches on the blanket with the reprinted ink. In this regard, check the drum teeth, such as uneven deformation caused by lack of force, should be re-adjusted. If the crepe lines are worn and the edges are not tight, new Accessories should be removed to ensure that the paper teeth do not slip and the ghosts can be removed.
8. Ghost caused by looseness of roller gear or bearing wear When the printing press is used for a long time, the maintenance and repair work is not carried out seriously, which will lead to serious abrasion of the roller gear or bearing, which will inevitably cause vibration in the imprinting process. The shadow will follow. In this regard, the wear should not be repaired, the fault can be cleared.
9. Difficulties caused by roller lining discomfort When the lining diameters of the plate cylinder and the squeegee 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 displaced. Deformation, and easy to move the plastic lining until the crease, imprinting reprint also comes with the fault. 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 speed should be kept consistent to avoid the occurrence of double-impression ghosting.
2. When the printing plate is not tight or the "bottom pad" is caused by ghosting, due to the lack of scientific operation knowledge, the fastening screws of the plate are not evenly tightened in order, resulting in uneven elasticity of the surface of the printing plate. There are traces of bowing, and the back pad of the printing plate is too soft, or the use of multiple pads or pads to make it critical void, can easily lead to local ghosting. In this regard, it is necessary to close the screwing amount of each screw gradually and successively. Tighten the plate so that the plate cannot fully and evenly cling to the surface of the roller. On the other hand, the padding used for padding on the back of the plate should be harder and try to avoid partial padding or air control to achieve the effect of eliminating ghosting failures.
3. Ghosting caused by excessive printing pressure When the pressure of the blanket cylinder and the embossing cylinder is too large, the deformation displacement of the blanket will increase correspondingly. As a result, the ink transfer during the imprinting process cannot be restored to the original state in time, and thus a slight difference in position is generated when receiving the imprint from the plate cylinder, and a ghost image is formed. In this regard, as long as the drum pressure is properly reduced and the expansion and contraction coefficient of the blanket is reduced, the fault can be removed.
4. The rubber is not loose or the ghost caused by the drum. When the blanket is tight, the force is not uniform, so that the local position is not close to the surface of the drum, and there is an empty or kicking drum, and the back of the blanket is partially When layer mats or foreign materials are attached, it is easy to make local layout impressions ghost. In this regard, the rubber blanket should be released for inspection, and the bad impressions should be re-tightened to eliminate the impression of ghosting.
5. Ghosting caused by inappropriate plate or blanket clamping When the plate or blanket is not clamped, a slight loosening during the stamping process can easily cause ghosting problems. In this regard, as long as a careful inspection to take appropriate measures, you can eliminate the ghosting shadow failure.
6.Ghosting caused by abnormal working of the drum pressurization. When the parts related to the drum clutch pressure are adjusted or the sound wear occurs, a certain position difference occurs at each pressurization, resulting in insufficient imprinted positions and repair of worn parts. To make the work of roller separation and compression work accurately, coordinate and unite, this fault can be eliminated.
7. Ghosting caused by insufficient paper pressure due to insufficient paper pressure. When the roller teeth are worn or deformed, the force exerted on the print sheet is insufficient when the paper is imprinted, so that the printed sheet slips out of the teeth in the imprint. Each time the amount of slip is not the same, when this is printed once, there is ghosting in the fistula area due to the inaccurate overlap of the embossed patches on the blanket with the reprinted ink. In this regard, check the drum teeth, such as uneven deformation caused by lack of force, should be re-adjusted. If the crepe lines are worn and the edges are not tight, new Accessories should be removed to ensure that the paper teeth do not slip and the ghosts can be removed.
8. Ghost caused by looseness of roller gear or bearing wear When the printing press is used for a long time, the maintenance and repair work is not carried out seriously, which will lead to serious abrasion of the roller gear or bearing, which will inevitably cause vibration in the imprinting process. The shadow will follow. In this regard, the wear should not be repaired, the fault can be cleared.
9. Difficulties caused by roller lining discomfort When the lining diameters of the plate cylinder and the squeegee 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 displaced. Deformation, and easy to move the plastic lining until the crease, imprinting reprint also comes with the fault. 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 speed should be kept consistent to avoid the occurrence of double-impression ghosting.
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