The viscosity of the ink is too high. When the ink has a large consistency and strong viscosity, a slight slip phenomenon occurs in the imprinting process during the imprinting process, which can easily cause ghosting failures. In particular, longitudinal gripping is more obvious when the gripper teeth are insufficient in strength. In this regard, as long as the proper ink transfer process is turned off, the ink is appropriately diluted, and the addition of the auxiliary agent reduces the viscosity of the ink, thereby effectively eliminating the image ghost.
The plate is not taut or "underfilled". At the time of loading, due to the lack of scientific operation knowledge, the fastening screws of the printing plate were not evenly tightened in order, so that the surface of the printing plate had uneven elasticity, localized traces of bowing, and the back pad of the printing plate was too soft. The use of multiple pads or pads to locally make the critical emptiness may easily lead to local ghosting.
In this regard, it is necessary to close the tightening amount of each screw gradually and successively by installing a good version of the operation technology and the pad plate process technology. The child tightened it. Make the plate can not fully and evenly close to the surface of the roller. On the other hand, the pad used for padding on the back of the plate should be harder and try to avoid local multiple pads or hollowing in order to eliminate ghosting.
Printing pressure is too high. When the pressure between the blanket cylinder and the impression cylinder is too large, the displacement of the blanket deformation will inevitably increase, so that the ink cannot be restored to the original state immediately after the ink transfer during the imprinting process, so that the impression is accepted from the plate cylinder again. At that time, a slight difference in position was generated and ghosting was formed. In this regard, as long as the roller pressure is properly reduced and the expansion and contraction coefficient of the blanket is reduced, the failure can be eliminated.
The blanket is loose or drumming. When the blanket is tightly stretched, the force is not uniform, so that the local position is not tight against the surface of the drum, and an emptiness or a drum failure occurs, and when the back of the blanket is adhered to a multilayer pad or a foreign body, it is easy to make Partial layout imprinting 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.
Improper clamping of plates or blankets. When the plate or blanket is not clamped, a slight loosening during the stamping process can easily cause ghosting failures. In this regard, as long as a careful inspection to take appropriate measures, you can eliminate the ghosting shadow failure. 6, the drum pressure is not working properly
When the parts related to the roller clutch pressure are not adjusted or the wear and tear occur each time the pressure is generated, a certain position difference is generated, resulting in ghost images that cause different positions. In this regard, as long as the recalibration and adjustment of the clutch pressure mechanism is correct, and the worn-out parts are repaired, the roller declutching and pressing work will be accurate, coordinated and unified, and such failures will be eliminated.
Paper pressure is insufficient. When the roller teeth are worn and deformed due to wear, the force exerted on the printed sheets is insufficient when press-stamping, so that the printed sheets slip out of the teeth during imprinting, and each slip amount is not the same. On one occasion, the ghosting of the fistula area occurred due to the incomplete overlap between the blurred blots retained on the blanket and the retransferred 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, you should remove the new accessories to ensure that the paper edge is not slipping and the ghosting faults can be eliminated.
Roller gear or bearing wear loose. When the printer is used for a long period of time, the maintenance and repair work is not carried out seriously, which will cause serious wear of the roller gear or bearing. Inevitably, vibration will occur during the imprinting process. Imprinted ghosting will follow. In this regard, after the worn parts should be repaired, the fault can be eliminated.
Roller lining discomfort. 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 linear velocity at each imprint, which causes the surface of the blanket to be squeezed and deformed, and the inner liner material is easily moved. Until the wrinkles, blotting ghosting faults follow. 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.
The plate is not taut or "underfilled". At the time of loading, due to the lack of scientific operation knowledge, the fastening screws of the printing plate were not evenly tightened in order, so that the surface of the printing plate had uneven elasticity, localized traces of bowing, and the back pad of the printing plate was too soft. The use of multiple pads or pads to locally make the critical emptiness may easily lead to local ghosting.
In this regard, it is necessary to close the tightening amount of each screw gradually and successively by installing a good version of the operation technology and the pad plate process technology. The child tightened it. Make the plate can not fully and evenly close to the surface of the roller. On the other hand, the pad used for padding on the back of the plate should be harder and try to avoid local multiple pads or hollowing in order to eliminate ghosting.
Printing pressure is too high. When the pressure between the blanket cylinder and the impression cylinder is too large, the displacement of the blanket deformation will inevitably increase, so that the ink cannot be restored to the original state immediately after the ink transfer during the imprinting process, so that the impression is accepted from the plate cylinder again. At that time, a slight difference in position was generated and ghosting was formed. In this regard, as long as the roller pressure is properly reduced and the expansion and contraction coefficient of the blanket is reduced, the failure can be eliminated.
The blanket is loose or drumming. When the blanket is tightly stretched, the force is not uniform, so that the local position is not tight against the surface of the drum, and an emptiness or a drum failure occurs, and when the back of the blanket is adhered to a multilayer pad or a foreign body, it is easy to make Partial layout imprinting 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.
Improper clamping of plates or blankets. When the plate or blanket is not clamped, a slight loosening during the stamping process can easily cause ghosting failures. In this regard, as long as a careful inspection to take appropriate measures, you can eliminate the ghosting shadow failure. 6, the drum pressure is not working properly
When the parts related to the roller clutch pressure are not adjusted or the wear and tear occur each time the pressure is generated, a certain position difference is generated, resulting in ghost images that cause different positions. In this regard, as long as the recalibration and adjustment of the clutch pressure mechanism is correct, and the worn-out parts are repaired, the roller declutching and pressing work will be accurate, coordinated and unified, and such failures will be eliminated.
Paper pressure is insufficient. When the roller teeth are worn and deformed due to wear, the force exerted on the printed sheets is insufficient when press-stamping, so that the printed sheets slip out of the teeth during imprinting, and each slip amount is not the same. On one occasion, the ghosting of the fistula area occurred due to the incomplete overlap between the blurred blots retained on the blanket and the retransferred 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, you should remove the new accessories to ensure that the paper edge is not slipping and the ghosting faults can be eliminated.
Roller gear or bearing wear loose. When the printer is used for a long period of time, the maintenance and repair work is not carried out seriously, which will cause serious wear of the roller gear or bearing. Inevitably, vibration will occur during the imprinting process. Imprinted ghosting will follow. In this regard, after the worn parts should be repaired, the fault can be eliminated.
Roller lining discomfort. 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 linear velocity at each imprint, which causes the surface of the blanket to be squeezed and deformed, and the inner liner material is easily moved. Until the wrinkles, blotting ghosting faults follow. 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.