Screen printing machine Screening technology improves the quality of printing (I)

Digital innovation", although the pre-press area has undergone great changes. But unfortunately, the quality of the print has not changed much. Although we produce a variety of manuals, posters, and magazines, such as the colors and methods of printing are very vivid, but the use of but still. Analog era" of 1751pi AM (AM). The quality of the prints only remains at the level of skills such as accurate overprinting and good color recovery. And can not fundamentally reach the close observation of the photo-level role in the request. The reason for this is that in the pre-press plate-making link, not through the leading, reasonable, and operable screening methods, the manufacture or scanning of high-resolution graphic information flawlessly on the PS plate or CTP plate, into the print formation.

Looking back on the development process of screening skills, each innovation of the screening method has brought momentum to the progress of print quality, but, to a certain extent, also restricts the continuous progress of print quality. Therefore, in the existing products and technical conditions, we urgently need to use new screening skills to replace the original traditional screening method, in order to improve the quality of all the prints.

The disadvantages of the traditional screening method

1, the traditional "amplitude screening" its own limitations, to the confusion of the printing industry. The traditional "width-adjustment plus network method" is through the change of the size of the dot to reflect the picture of the level and color changes. Today, the majority of screen printing machine technology is used by this method of screening. Its advantage is that the distance and point of view of the dot are fixed, and it can reflect the gradation of the picture in a stable way.

However, the screen-adjusting method has a drawback that cannot be ignored. Because the halftone network has a fixed distance and point of view if each color version with a strict registration, or the network line point of view and the picture of the scene pattern conflict. It is very simple to cause the presentation of the turtle pattern. In the use of this method of screening, the jagged lines and cracking, or perhaps in the sudden change of color area to show the jump in tone, etc., are very typical of the problem. What is even more annoying is that such problems cannot be predicted before printing on a screen printing machine. In the process of moving to a fully digital workflow in the prepress area (which includes the introduction of CTP skills and the rationalization of the digital proofing process), these problems play the role of roadblocks.

If you try to use a higher number of widths and screens to achieve higher print quality, you will encounter other problems: for printing skills, the need for more stringent print quality management. This is a difficult task. Because of this, only a very few printers today are brave enough to test printing above 3001pi.

Although powerful graphics processing software allows us to easily get high-precision digital information because the general can only be 175 LPI amplitude screening, the printing industry can only "print a more precise graphics" thing can not do anything.

2. FM screening skills because of the bundle of skills, but also can only be ignored.

We once put our hopes on the FM network (FM) skills, expecting it to replace the AM network. FM screening produces very small dots on the color separation plate. These small dots are sparse and dense enough to reflect the changes in the layers of the picture. This skill can not only prevent the turtle pattern and broken line problems, ink coverage can reach 250, but also beneficial to improve the resolution of the print. But the work is not as perfect as everyone expected. FM Screening also has some serious defects. It is extremely demanding on the printing skills. To satisfy these requirements, the cost of print production will be greatly improved. In addition, in the printing process, the center tone and dark tone some of the level of an embodiment is not easy to grasp, the quality of volatility is very great, and highlights and dark tone some of the grain scenes is very serious. So... Although FM screening is better than AM screening in some aspects, because of these more serious defects, and therefore has not been able to be really widely used.