Graphic Design and Separation Techniques for Screen Printing

To tell the truth, I don't really like to know only how to manipulate the computer without knowing the printing process. How to blame the designer for designing, they do not even consider whether the post-printing process can be realized. I think that as a designer, he The artistic literacy and technical literacy (scientific thinking) are equally important. The art of print art should have a scope, that is, creation should also be carried out within the scope of the process that can be achieved by the craft. Here, let's get to the point where everyone says silk. Network printing is universal printing. The author wants to talk about today is the boundary issue of this universal printing. Some things are not absolutely impossible. There is a problem of avoiding weaknesses. That is, to do screen printing is to understand the screen printing. Strengths and weaknesses, to carry forward strengths, and try their best to avoid the design patterns that are difficult to achieve or prone to problems in the process. This article mainly discusses what graphics graphics design is conducive to screen printing and some specific solutions, personal views, hope Resonate with readers.

Screen printing has strengths and weaknesses. Taking CD printing as an example, screen printing spot color is the most beautiful, the ink surface is smooth, and the gloss is very good. However, the effect of printing on color images cannot be compared with that of offset CD printing machines. Screen printing is also challenging in terms of print color uniformity. This is because screen printing is determined by the nature of the stencil printing method.


First of all, talk about the attention of spot color graphic design. First of all, due to screen resolution, screen printing is difficult to print the small words below the clear No. 6 character. When printing text, the same number of positive characters is better than hollow printed. It is better to print some. And in the printing we need to use vector graphics for color separation, in the screen printing of the text design, we should try to use the font of the line body and strokes thicker, such as the black body, like the book Song, Song Song Songs such as Siao Biao and Song are more beautiful. However, when using these fonts in screen printing, you will encounter the problem of incomplete lines and lines. I am talking about precision printing here. If it is a large-scale advertising painting screen printing, then There are not so many taboos. Large prints such as cloth printing are not part of the discussion.


The accuracy of screen printing is an important parameter to test the pros and cons of screen printing equipment. However, precise registration is far from being well grasped. Printing materials with large format and high printing requirements are challenging. Asked us to take into account the process in the production of design drafts, here to talk about the hiding power of screen printing inks, the general situation is this, light-colored inks such as the yellow is generally not very good hiding power, and black, dark blue and white We can achieve high hiding power. When we print in two colors, such as printing white on red and white on black, we can use imprinting because the hiding power of white ink can be made high enough. But we meet When printing a red and yellow pattern on a blue background at the end of the black, it is not possible to use imprinting. Since the hiding power of the ink is insufficient, we cannot obtain relatively bright yellow and red colors. At this time, we must adopt the method of overprinting but overprinting. It is necessary to do trapping, generally this operation, the bold color pattern edges, this can only be achieved by vector graphics, and then, in the black or blue version of the light-colored pattern of the edge is not bold figure , In the appropriate position plus crosshairs, color removal, after the color version is filled with 100% black, and then sent to the photogenic center to out of the film. Multicolor overprint and so on, this will help the smooth progress of the printing process. Need to emphasize Yes, multicolor printing must deal with the trapping relationship between the color version.

Spot color printing is something that screen printing is good at. Essentially, screen printing for tweed printing is inherently a bit reluctant. Although the screen printing work done by the author is for printing 100 lines/inch or more, I Always think so. Doing tone silk screen, especially the fine order withered printing, that taboo point is really a lot, this involves all aspects of screen printing, I would like to talk about it in detail, and with some patterns and images to allow readers More intuitive.


Because of the cutting of screens and the influence of moiré, we really have a hard time copying a color image perfectly. This requires us to consider avoiding the things that are easy to go wrong when we are designing drafts. In other print articles concerning the precise gradation, the author also talks about this problem, such as a large-area gradation, dropping a dot during the platemaking process, or a tiny hair on the printing surface during the printing process. The results will affect the quality of the product and people will feel uncomfortable. Even if you do not encounter the above problem, then how do you solve the problem of dot gain? Perhaps it can be said that the best automaton can not solve the delicate stage now. With the problem of uniform color with large areas and gradients, then the method we adopt is best avoided as much as possible. In addition, large area, simple neutral grey and large area gradient colors are a property, but it is technically It is more difficult to deal with transitional colors, so designers should pay more attention to the drafts. The so-called neutral gray, for example, like the electronic documents of Chinese ink paintings are mostly of this type. The gray color of the yellow print is very easy to cause color shift, and eventually the gray color is not the same. This kind of gray is not only a headache for screen printers, but the offset printing master is also afraid of encountering such a list. Figure 1. The requirements for the printing of this graphic on the environment are very strict, and the problem is that only a few companies' environment reaches the level of clean space in the electronics industry.

Screen printing tone images, use as little as possible light, for example, such as 3% yellow, 4% of the green, 5% of the product overprint the background, this background is really difficult to see. If you are taller, you will see a nest of small outlets. Screen printing is still afraid of flat screens. That is to say, it is not difficult to understand the same color tone that is overprinted with two or more color dots on a large area. I am talking about the order of the high number of lines, large-format advertising printing is not within the scope of my discussion. So, if you encounter a large area of ​​flat screen, if you really can not meet the customers, then send a spot color to print, this is also a Solution it.

If we print four colors, there are some texts in the script that need color printing, such as the font of the sixth character, which is very difficult to overprint. Then I suggest to put these words out and send out a spot color imprint. More than one color, but do not save overprinting is not ideal trouble. As shown in Figure 2 on the white font of small words. If it is the production of special effects word, then it will only follow the four-color away.


Making screen-printing artwork can now be grasped in the most general context. The thickness of silk-screen printing ink is very bright and the color of offset printing is relatively flat, especially when printing on plastics and other materials. Screen printing is suitable for printing colorful and color grades are not very flat prints, bogey simple color grade transitional smooth prints, of course, can not be generalized. This with the printing of the screen printing parameters to effectively grasp has a lot to do.

The application of screen printing is very extensive. Indeed, the requirements of each industry are not the same. The screen printing of the electronics industry generally pays attention to the uniformity of the ink layer and the clarity of the lines. There is generally no dot printing here. Here are just some graphics. The general attention of image design, of course, there are some image resolution, image and vector graphics and text formatting, and text printing, common sense of imprint, I need not say, I hope more designers and computers The drafting staff can read this article, hoping to have more good silk screen printing patterns, so that the screen printing staff's head to do less technical challenges.


Source: Disc Silk Screening Forum

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