Fourth, ghosts
Ghosting is characterized by the fact that at the time of printing each unit product of repeated perimeters, there is a partial paleness of the ink in a fixed position, which is a part of the product pattern itself. Ghosts are not caused by color registration, and only a single color product will produce this situation when ghosts appear. Ghosts often happen in the field version. Because it is difficult to explain why it formed, the foreign counterparts call it Ghosting, which means ghosts. Domestic counterparts call them ghosts. The reason for the ghosting is actually the trace left by the printing plate on the anilox roller.
The solution to ghosting is:
1. The repeat perimeter of the plate is ≥ the circumference of the anilox roller. Obviously, when the diameter of the anilox roller is relatively small, that is, the anilox roller rotates faster and the frequency of ink refilling is higher, ghosting will not occur. Therefore, depending on the peripheral length of the flexographic printing machine anilox roller, the product perimeter must be selected. This must be taken into consideration when finalizing the design.
2. The color blocks on the imposition product pattern should be placed in the neutral position of the repeated pattern according to the position where the difference between the circumference of the anilox roller and the circumference of the platen roller does not overlap with the original color block. Since most of our products use imposition printing, it is truly possible to achieve a product that has a repeat circumference of ≥ anilox roller circumference after all. Therefore, in the case where a large number of product units repeat the circumference less than the circumference of the anilox roller, we must check the difference between the circumference of the anilox roller and the circumference of the printing roller to check whether there is a large color pattern at this position. If there is exactly one gap, this product will not have ghosts. If there is a large color pattern here, the probability of ghosting is very high.
3. Use a slow drying agent. In the real encounter with this design can not be avoided, the use of slow drying agent will be a very practical approach. The main purpose of adding a slow drying agent is to increase the leveling of the ink on the anilox roller and to make the ink dry as slowly as possible on the anilox roller. Machines using UV inks have less chance of ghosting because UV inks do not dry out without a UV curing device. Both ink and alcohol-soluble inks can be added with a slow-drying agent, which is more effective in dealing with ghosting effects.
4. The appearance of ghosts is often in the field version. When printing with the field version, many of our operators like to increase the pressure. Therefore, another way to solve the ghosts is to reduce the pressure on the ink. Sometimes we find ghosts under slow speed conditions, and we gradually eliminate ghosts by increasing the speed of printing. This is actually the reason for the pressure relief.
Ghosting is characterized by the fact that at the time of printing each unit product of repeated perimeters, there is a partial paleness of the ink in a fixed position, which is a part of the product pattern itself. Ghosts are not caused by color registration, and only a single color product will produce this situation when ghosts appear. Ghosts often happen in the field version. Because it is difficult to explain why it formed, the foreign counterparts call it Ghosting, which means ghosts. Domestic counterparts call them ghosts. The reason for the ghosting is actually the trace left by the printing plate on the anilox roller.
The solution to ghosting is:
1. The repeat perimeter of the plate is ≥ the circumference of the anilox roller. Obviously, when the diameter of the anilox roller is relatively small, that is, the anilox roller rotates faster and the frequency of ink refilling is higher, ghosting will not occur. Therefore, depending on the peripheral length of the flexographic printing machine anilox roller, the product perimeter must be selected. This must be taken into consideration when finalizing the design.
2. The color blocks on the imposition product pattern should be placed in the neutral position of the repeated pattern according to the position where the difference between the circumference of the anilox roller and the circumference of the platen roller does not overlap with the original color block. Since most of our products use imposition printing, it is truly possible to achieve a product that has a repeat circumference of ≥ anilox roller circumference after all. Therefore, in the case where a large number of product units repeat the circumference less than the circumference of the anilox roller, we must check the difference between the circumference of the anilox roller and the circumference of the printing roller to check whether there is a large color pattern at this position. If there is exactly one gap, this product will not have ghosts. If there is a large color pattern here, the probability of ghosting is very high.
3. Use a slow drying agent. In the real encounter with this design can not be avoided, the use of slow drying agent will be a very practical approach. The main purpose of adding a slow drying agent is to increase the leveling of the ink on the anilox roller and to make the ink dry as slowly as possible on the anilox roller. Machines using UV inks have less chance of ghosting because UV inks do not dry out without a UV curing device. Both ink and alcohol-soluble inks can be added with a slow-drying agent, which is more effective in dealing with ghosting effects.
4. The appearance of ghosts is often in the field version. When printing with the field version, many of our operators like to increase the pressure. Therefore, another way to solve the ghosts is to reduce the pressure on the ink. Sometimes we find ghosts under slow speed conditions, and we gradually eliminate ghosts by increasing the speed of printing. This is actually the reason for the pressure relief.
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