When you see the title, you may ask: What is the mainstream output method of CTP? The mainstream output machine is divided into the inner drum machine and the outer drum machine, so the platform is non-mainstream; the mainstream of the light imaging the plate is visible light such as red light, green light, blue-violet light, and 830nm, 1064nm infrared light. Visible light, others are non-mainstream methods. 1. Thermal non-mainstream There are more non-mainstream output methods in thermal sensitivity, including: A needs to be preheated before printing, B phase change without washing, C thermal sense without horizontal printing plate three methods, the mainstream method is thermal direct printing method, and Without preheating, direct printing is the way to pick up the banner of heat. Thermal non-mainstream output (A) Pre-heating is required The pre-heating method of thermal sensation is originally the mainstream of thermal CTP printing plates, but it must be heated after photosensitive and before entering the plate making, so that the thermal part has an effect on the photosensitive layer, catalyzing a chain reaction from the surface to the bottom surface, From top to bottom, the resin combination of the bridge of the complete print is completed. This method seems a bit outdated, from the mainstream to the non-mainstream format, but its biggest advantage is the negative type exposure, the natural way to form the printing pattern with the photosensitive part, so it is still used in the long version of commercial and newspaper rotation Lithography machine, it can only expose the pattern forming part, and the opening and tail of the plate do not need to be exposed, so the area is smaller and the speed is faster. In addition, the negative thermal plate can be produced by baking and re-exposure The printing pattern is hardened, and the printing capacity is high. After long-run printing, the 200,000-point printing plate can be added. After baking, it can increase the printing durability by 400,000 copies, which has a positive effect on a large number of publishing and newspaper industries. Although it is more troublesome, and the heating conditions will also affect the layout and the reproduction of the dots, but the 1200dpi newspaper requires that the dots slightly increase and the impact is not large, so the old way of heating and then rinsing after the thermal feeling, although not the mainstream thermal version However, because of the sensitivity of the negative film and the durability of printing, it will continue to be used for a long time in this regard. Thermal non-mainstream output mode (B) Phase change heat-free version Phase change impact-free thermal plate, published by Asahi Kasei of Japan, mainly relies on the thermal layer coated on the surface of the plate. It is usually hydrophilic, but after thermal exposure, the coating layer is oleophilic in the printed area. The ink is placed in the oleophilic printing part, which is a unique way in the hot-free thermal printing plate. Whether it can be commercialized in the future remains to be seen, but if it can be used, it will be the best plate for the on-board plate making water DI machine , Because there is no shedding and debris. Thermal non-mainstream output mode (C) Thermal levelless printing plate Most of the thermal levelless printing plates use the infrared heat energy of the laser to make the adhesive layer of the horizontal printing plates fall off and become the printed part that can stick to the ink. At present, the two are mainly Presstek in the United States and Toray in Japan. However, Presstek is still the majority of DI plate materials. Although the technology is quite mature, the cost of plate materials has not decreased, so it cannot be greatly expanded, and a non-mainstream CTP plate material in a special field has been formed. 2. Non-mainstream UV and general PS version The CTP method that uses ultraviolet light and the general PS version is the UVSetter of the German BasysPrint company. The main selling point is that the working environment is very open, just like the printing room, the second is that the plate material can find a higher sensitivity PS version. Third, The machine uses XY axis to move the exposure, without any rotating components, so it is easy to maintain. The biggest feature is the block mirror, which contains many small hiding mechanisms to form the core of resolution and control. It is still suitable for printing on the negative version, because it can be accurately exposed in the printed area, and the part without the printing moves quickly or does not pass to save the exposure time. This advanced concept uses traditional materials, which should save costs, but the price of the machine is very high, and there are not many people currently buying it, so it is still developing in the non-mainstream field. 3. Non-mainstream thermal ribbon imaging CTP for thermal ribbon imaging. This method is currently only used by Manroland DicoWeb. I believe that other manufacturers will also quote this reusable, photosensitive-free, thermal layer coating, and only use the material of thermal patterning belt In this way, consumables can be reduced a lot, which is also very beneficial to environmental protection, but it still needs to work hard to improve the amount of printing resistance. 4. Non-mainstream platform photosensitive The small size CTP mostly uses platform type photosensitive, but the XY axis moves differently from the block light source described in item 3, but the printing plate moves on the X axis, and the light source scans linearly from one side to the other on the Y axis , With the X-axis movement to form the photosensitive surface, some using rotary spectacles to move, and some using multi-light speed section exposure is different, fewer moving elements. 5. Non-mainstream inkjet imaging There are two ways to use inkjet CTP: one is to directly use oily ink to image on a blank printing plate, which is cheap and easy to save, and the printing capacity is 10,000 or 20,000 copies; the other is to spray on the positive PS plate The shading method is mainly film-free, but after printing the print, it still needs to be exposed and developed again. All printing conditions are like the traditional PS version. If you use 600dpi inkjet, you can still only do rough work. Switching to 1200X1200dpi or more is very useful. Ink dots up to 1800dpi are very fine and usable, which is a cheap CTP method with potential for future development.
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