The correct transfer of dots during printing is one of the key elements for evaluating the quality of printing, but the original concept of controlling percentage and tone in traditional screen printing is no longer applicable. FM dot printing can only check whether the ideas are complete and not lost. The increase of outlets is inevitable.
We know that if the pressure is too large during printing, or the amount of grinding is too large, the idea will definitely increase. If according to the theoretical law of the area around the dot, the dot increase is calculated by the perimeter of all printed dots, then the FM dots are small and almost isolated, and the sum of the dots is much larger than the traditional dots, but all dots are normal The increase in the situation is uniform. At the same time, due to the high accuracy of the FM dot recording, the idea is thin, and the tone can be copied is almost unlimited. Therefore, the image is still soft and high definition, but it does not mean that the pressure or ink volume can be increased. Since the FM dots are isolated and unevenly distributed, the force of each dot in the unit area is not uniform, especially the highlights are few and rare, the dots in the unit area are the most stressed, the wear is serious, and the risk of dot loss is the greatest . Therefore, the use of hard liners is more suitable for printing FM dots.
In addition, because all the isolated ink spots on the printing are surrounded by the wetting liquid, it is easy to be wetted by the chemical liquid. Excessive water consumption or inappropriate pH value will also cause the dot loss. Therefore, the key to printing is to master the printing pressure and water-ink balance.
At the same time, the original printing quality control strips used in printing are not suitable for FM dot printing, and it is necessary to develop new tools for measuring and controlling printing quality.
In summary, in the entire printing process of FM dot printing, all aspects of the operation must be standardized, and environmental requirements are extremely high, especially in the plate-making stage. But in the printing operation, it is obviously much easier than traditional dot printing.
a. Not sensitive to accurate requirements for overprinting. Because the FM points on each color version are irregularly distributed, even if the distribution of dots of different colors in the same part is also different, a slight error can not reflect the major change of color, and it is easy to obtain gray balance, so it can save the cost of adjusting the overprint error A lot of time.
b. The key in printing is to pay attention to the fact that the FM dots cannot be lost. Even if the dots increase, they are even and consistent, and will not affect too much change in the tuning value. At the same time, there is no need to worry about the occurrence of white spots and moire.
c. Because the frequency modulation dots are fine, dark tone is not easy to produce paste, so the ink and ink balance is not very sensitive.
d. Since the FM dots are randomly distributed and isolated, it is not easy to cause paper fluffing during printing, and the phenomenon of increased scumming on the back is also greatly reduced, so the viscosity of the printing ink can be slightly larger.
According to the test, FM screen printing using a laser spot of 1200dpi as an inking point can not only improve the printing quality, but also reduce the labor level of the operator, which is a new technology worth promoting.
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