The hottest reticle ink transfer roller strip test

2022-10-02
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In short, the purpose of inking roller strip test is to find the thinnest ink layer so that our printing can meet the predetermined color density. Using thin ink printing has several advantages: 1. It can reduce dot expansion and improve the range of color matching; 2. Fast dry ink, reduce ink sticking, and speed up printing; 3. Less ink; 4. The printing line is clear -- especially in the processing of thin lines, anti white words and footmarks. 5. Reducing VOC consumption is conducive to environmental protection. 6. The printing preparation time is short and the image processing speed is fast. Before the ink roller strip test, we should first clarify the test purpose, the requirements to be achieved, and reasonably arrange various test elements, so as to obtain satisfactory results. A typical test picture should include: * Yin/Yang text* Continuous vignetting color* Yin/Yang lines * long lines are matched with white leakage on the ground to measure ghosts* Fuzzy shadow point* Several gray gradient transformation lines. Mark the line and include all changes of gradient from thick to light* A large block with 30% screen to observe the continuity and strip condition of printing. Of course, the main result of ink roller strip test is to find the predetermined color density (slightly larger than the actual). Some special designs in the test image are just to better understand the printing situation and its causes. They may have nothing to do with the ink transfer roller. During the experiment, pay attention to be consistent with the usual production, do not carry out special environmental treatment, and do not adjust the ink. Only select the best, worst and medium printing materials. Monitor each experimental sample and record relevant data. Others can be operated according to the common sense of printing test. The evaluation of test results is as mentioned above, and color density is the main purpose of the test. When measuring the overall color printing, adjust the color density of each color ink to the maximum value, make it pass through all ink roller test strips, and then determine the printing color density that should be required to achieve gray balance according to the color splitter or FIA's f.i.r.s.t manual, and then add at least 0.07 points according to its value to find the corresponding ink roller strip, which is the required ink roller parameters. For example, if the magenta value in printing is 1.25, you should find the strip with the minimum value of 1.32, rather than the strip with the value of exactly 1.25, because some weak colors require higher ink flux during printing. A set of standards should be established as far as possible to express the corresponding relationship between the ink roller eye, ink flux and various colors. In fact, whether a printing color is weak or strong is stable in strip test. Data error no matter what others say, the field color density value sometimes makes errors. Ink may have pinholes or accumulation, and the printing material will also transmit some light, which can only reflect 85% of the screen tone rather than the field value, all of which will affect the reading value. In this case, we can read the value of the point based on the TPE capacity of Voronezh factory, which will be very helpful. Similarly, we can also put aside the gray level and check the large-area printing area that can be inked continuously, which can also provide us with a useful reference. The density value of the ink roller measuring belt should be the highest value, not the average. Line color printing for line color printing, as long as the most special color is detected, the method is the same as the whole printing. However, it should be noted that its color will shift due to the thickness of the ink film. This can be solved by referring to the relevant color standard data. If combined printing and field printing must be printed at the same time, then it is necessary to see which screen is the cleanest and the most colorful. The choice of ink roller plate should be lower than the whole printing standard and higher than the line printing standard, which is a compromise between them. In line color printing, the ink flux of the roller is high. If the screen plate is a little rough, the image can be clearer. The problem of ink drying speed in the ink roller strip test, another biggest problem is the solidification speed of ink. Almost every company can produce dense, slow solidification ink. But sometimes the ink supplier does not know what kind of ink is needed for thin ink film printing, so errors often occur. Thin film printing requires dense but slow drying inks. If the drying speed is too fast, it will cause edge drying and dot fragmentation, which will affect the printing effect, so the ink that dries slowly is better. Although adding slow additives to the ink can enhance the ink transfer effect and meet the requirements of thin ink film printing, it will affect other characteristics, and the ink spots of post printing products are also easy to fall off, which is inconvenient for production. Therefore, a simple test should be done one or two weeks before the formal experiment, so that the manufacturer has time to prepare the corresponding ink for the formal experiment. In addition to determining the color density and ink solidification speed, the other function of testing pictures is to further determine the printing performance. Generally speaking, the lower the ink flux of the ink roller, the thinner the line of the ink roller. There are several different gray gradient lines on the test image, which are the contrast lines of different screens. When the ink flux of the ink roller decreases, some gray lines will be bridged or dirty. Generally, the 150 wire screen can match the 900cpi (350 wire) low ink flux ink roller, but when the ink roller line becomes larger or the ink flux increases, this screen will also appear bridging and dirty. When printing, we must make the highlight area and middle tone area of silk printing the clearest, so as to achieve a good printing effect. The highlight and middle tone areas are clear, and the plate line plays a very important role. Generally, the lower the ink volume, the clearer the line. The ink roller of the highest line can match the thinnest printing plate line, but the color density will become insufficient. Therefore, after determining the color density, we should determine the problem of printing plate line again. The problem of fuzzy highlight area is mainly caused by the invasion of points. If the halftone dot is smaller than the eye aperture of the ink roller, the dot will invade the eye of the ink roller and absorb too many ink particles, causing the dirty highlight area, so it should be replaced. Intermediate tinting if the ink film is too thick, the dots will be bridged, and the intermediate tinting will be unclear. At this time, according to the vignette or gradient screen, select the screen that can make the middle color palette the clearest. Point expansion can find the relevant number of lines according to the results of the ink roller test plate, and solve the problem that point expansion can be seen from the outlet of oil spill. Generally, the film printing machine is 120 lines/inch, and the corrugated paper printing machine is 85 lines/inch. You can also read the value of the key tone area or use a densimeter to understand the general trend of point expansion, and draw the change line through drawing for comparison. Contrast contrast is an indicator of the difference between 100% screen tone and the field. This standard has little significance in ink roller testing. Dot blur when using an ink roller with less ink capacity, the negative impact of dot blur can be reduced and dot expansion will not be caused. 30% screen block by observing the printing block, you can understand the vibration and strip condition of the vignette image that cannot be violently impacted by the inclined block on the swing arm. If there is strip phenomenon in the vignette image, you can conclude that there is a problem with the printing machine, which has nothing to do with the ink roller. However, using a small flow ink roller can also reduce the strip phenomenon. Dirty and full text: when the ink film becomes thinner, the text and lines can also become thinner. At this time, we should carefully select the printing plate to ensure the clear reproduction of words and thin lines. Pinhole version pinholes prevent ink from coloring. It depends on the specific situation whether it is to increase the printing pressure, change the ink composition or simply ignore it. Image fidelity and color range using densimeter to measure the point color range, it can be found that thin ink film printing has the characteristics of reducing the low point and expanding, improving the contrast and increasing the color range. As for the unexpected problem, the ink roller with thick line has more ink flow, and the ink roller with thin line has less ink flow. Therefore, we choose the futures: the ink roller with strong afternoon oscillation of coke 1701 contract. But sometimes there are unexpected results. But facts are facts after all, and such things are also helpful to us. Ghosting refers to the phenomenon that the pattern of the previous printing is continuously retained in the later printing process. Generally, its influence will increase with the decrease of ink roller flow. The circumstances of neglect depend on the situation. Other dust, paper fiber, LDPE and paper wool will affect thin ink film printing. Sometimes it is very serious, which will destroy the whole image. Such problems should also be paid attention to. Looking at the full text, we should be able to draw the following conclusions: * Don't choose the ink roller plate that just meets the color density requirements* The printing plate wire and the ink roller hole should be coordinated to find a balance point, which can make the printing tone the clearest* The scheme of combined printing is a compromise between color density, printing number and printing clarity* The ink roller strip test is to find the appropriate parameters to minimize the ink flow when the ink roller meets the requirements of color density* If the ink dries quickly or the color does not meet the requirements, contact the ink supplier in advance. In short, the ink roller strip test can eliminate the influence of human speculation, and provide an objective basis for us to choose the appropriate ink roller

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