Printability of FM outlets
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The correct transfer of dots at the time of printing is one of the key elements for evaluating print quality. However, the concept of controlling percentage and tone in traditional screen printing is no longer applicable. FM dot printing can only check whether the idea is complete without loss. The increase in outlets is inevitable.
We know that if the pressure is too large in the printing, or if the amount of grinding is too large, the idea will definitely increase. According to the theoretical rule of the surrounding area of the dot, the dot gain is calculated by the circumference of all printed dots. The FM dot is small and almost isolated. The sum of the dots is much larger than the traditional dot, but all the dots are normal. The situation increase value is uniform. At the same time, due to the high precision of the FM dot recording, the fine points and the repeatable tone are almost unlimited. Therefore, the image is still soft in level and high in definition, but it is not said that the pressure or the amount of ink can be increased by this. Because the FM network is isolated, and the distribution is uneven, the force of each part of the unit area is not uniform, especially the highlights are few and thin, the point on the unit area is the most stressed, the wear is serious, and the risk of the loss is the largest. . Therefore, the use of rigid pads is more suitable for FM dot printing.
In addition, since all the surrounding ink dots on the printing are surrounded by the dampening liquid, it is easily wetted by the chemical liquid, and the water consumption is too large or the pH value is inappropriate, which may cause the dot to be lost. Therefore, the key to printing is to master the printing pressure and ink balance.
At the same time, the printing quality control strip used in the original printing is not suitable for FM dot printing, and it is necessary to develop a new tool for measuring and controlling the printing quality.
In summary, FM dot printing is performed throughout the printing process, and all aspects of operations must be standardized, and environmental conditions are extremely high, especially in the plate making stage. However, in the printing operation, it is obviously much easier than the traditional dot printing.
a, not sensitive to the exact requirements of overprinting. Because the frequency modulation points on each color plate are irregularly distributed, even if the distribution of dots of different colors in the same part is different, a slight error can not reflect the significant change of color, and it is easy to obtain gray balance, so it can save the cost of adjusting the overprinting error. A lot of time.
b. The key in printing is to pay attention to the fact that the FM network can't be lost. Even if the network point is increased, it is uniform and will not affect the too much change of the value adjustment. At the same time, you don't have to worry about white spots and moiré.
c. Because the FM network is fine, the dark tone is not easy to produce a paste, so the ink balance is not too sensitive.
d. Since the frequency modulation dots are randomly distributed and isolated, it is not easy to cause the paper to be pulled during printing, and the back surface increase phenomenon is also greatly reduced, so the printing ink viscosity can be slightly larger.
According to the test, the frequency modulation network printing using a laser spot of 1200 dpi as an ink point can not only improve the printing quality, but also reduce the labor level of the operator, and is a new technology worthy of promotion.