FM screening trend
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On the AM screen print, the printed image is turbid compared to the actual original. This is not the turbidity of the ink itself, but the turbidity felt by the moment when the white paper around the ink image is reflected in the human eye. It can be seen from Fig. 6 that when the dot gain occurs, the aspect of the FM screen is larger than that of the AM screen, so the naked eye is difficult to feel the white paper, thereby reducing the turbidity of the color. . According to this phenomenon, the color of the ink image looks bright).
Furthermore, in the case of Staccato, the arrangement of the dots of each color is reduced, and the overlap is reduced, thereby reducing the turbidity caused by the overlapping of the reflected light and the ink from the white of the paper, and at the same time thinning the ink film to improve the middletone. Color saturation plays a role.
FM screening and the reduction effect of ink consumption
It does not have the AM screening, and one of the biggest features of the FM screening has the effect of reducing the amount of ink consumed. As mentioned above, the AM screening is different in the size of the dots. The ink is viscous, and the thickness of the ink film (the amount of ink) is different on the large dots and small dots. Therefore, the amount of ink is not uniform, and the amount of ink supply (pushing the ink button) has to be adjusted during the printing process. On the other hand, FM screening is a fine point, the amount of ink is limited, the ink film is thin and uniform, and a minimum amount of ink can be supplied for printing, thereby saving ink consumption.
According to the printing test of the official printing press of Creo, a report of 18-34% ink saving has been known. Considering the increase in dot size, the FM screen and the AM screen are used to obtain the same reproduction. Compared with the image area (inking area) on the compensated plate, there is a 10% area difference. In fact, measuring the ink consumption on the printing company's web offset press also yields an average savings of 15-17%.
In any case, the printing aspect shows a non-negligible effect from the viewpoint of saving ink consumption. However, this is from the perspective of a gradation of images such as photography and uniform density. If it is text or only low-surface printing, then FM screening and AM screening are exactly the same. Furthermore, even if there is a tone image, the effect of the reduction will be different due to the depth of the tone.
Conclusion
In the current printing industry, where large technological innovations are not expected, as a strategy for differentiated printing products, it is true that with the popularization of CTP, it is true that the effect of FM screening is re-evaluated. However, it is still in its infancy, and there are still many issues to be solved.
The current prepress engineering and printing workflows are mainly based on the AM screening process. Among them, just changing the screening to FM screening will bring many problems to be solved in color reproduction and other aspects. When solving these problems and making FM screening a perfect workflow, it is not only to improve the software for FM screening, but more importantly to improve ink, paper, plate, dampening solution, blanket, printing. In all aspects, such as the machine, in the face of these issues that need to be resolved, it is the best policy to look forward to adopting a coordination system among the relevant manufacturers.