Analysis of Several Non-mainstream Output Methods of CTP
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Seeing the title may ask: What is the mainstream output of CTP? The mainstream output machine has the inner roller machine and the outer roller machine, so the platform is non-mainstream; let the plate imaged light, the mainstream has red light, green light, blue-violet light and other visible light, and 830nm, 1064nm infrared, etc. Visible light, others are non-mainstream.
1, thermal non-mainstream
There are many non-mainstream output methods in terms of heat sensitivity, including: A must preheat the plate, B phase change is free of flushing, C thermal sense has no horizontal printing plate, and the mainstream mode is thermal direct printing mode. Free pre-heating direct printing is the way to pick up the hot flag.
Thermal non-mainstream output mode (A)
Must be preheated
The thermal sensation must be preheated. It is originally the mainstream of thermal CTP printing plates. However, since it must be heated before entering the stencil, the sensible part acts on the photosensitive layer, and the surface is catalyzed to form a chain reaction. The complete imprinted bridge resin bond is completed from top to bottom.
This approach seems a bit outdated, from the mainstream to the non-mainstream layout, but its biggest advantage is the negative film exposure, the natural way of forming the impression after the photosensitive part, so it is still used in the long version of the commercial and printing rotation The flat printing machine can only make the exposure of the print forming part, and the mouth and the end of the print are areas that do not need to be exposed, so the area is small and the speed is fast. In addition, the negative type thermal proof plate can be baked and re-exposed. The printing pattern is hardened, and the printing capacity is reduced. In the long-distance printing, 200,000-minute printing plates can increase the printing resistance by 400,000 copies, which has a positive effect on a large number of publishing and newspapers. Although it is cumbersome, and the heating conditions will affect the tone And the dot reproduction, but the 1200dpi newspaper requires that the outlets have a slight increase and the impact is not large, so the old way of heating and re-rinsing after the heat, although not the mainstream thermal version, but because of the negative film sensitivity and printing reasons, here The aspect will continue to be extended for a long time.
Thermal non-mainstream output mode (B)
Phase change free of charge
Phase change free of charge thermal proof, published by Asahi Kasei of Japan, mainly relies on the thermal layer coated on the plate, which is usually hydrophilic, but after the thermal exposure, the coating layer is lipophilic in the printed part. The ink is placed in the lipophilic printing section, which is unique in the heat-free 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 water DI machine on the machine. Because there is no shedding and debris.
Thermal non-mainstream output mode (C)
Thermal no horizontal plate
The thermal sense has no horizontal printing plate, and most of them use the infrared heat energy of the laser to make the glue layer of the horizontal printing plate fall off and become the printing part which can adhere to the ink. At present, the two are mainly Presstek and Toray of Japan. However, the use of plates for DI is still more than Presstek. Although the technical aspects are quite mature, the cost of plate materials has not decreased, so it cannot be greatly expanded, and a non-mainstream CTP plate is formed in a special field.
2, non-mainstream UV and general PS version
Using UV light and the general PS version of the CTP method, there is UV from Basys Print, Germany. Setter, the main selling point is that the working environment is very open, just like the printing room, the second is to find the higher sensitivity PS version. Third, the machine is moved by XY axis, without any rotating components, better maintenance . The biggest feature is a block mirror with many small opening mechanisms to form the center of resolution and control. It is still suitable for the negative version of the print, because it can be accurately exposed in the printed area, no print part moves quickly or does not pass, to save exposure time. This advanced concept uses traditional materials, which should save costs, but the price of the machine is high, and there are not many people 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. It is believed that other manufacturers will also refer to this reusable, non-sensitized, thermal layer coating, which only uses materials for thermal printing. This consumables can be reduced a lot, and it is also very beneficial to the environment, but it is still necessary to work hard to improve the printing capacity.
4, non-mainstream platform-type sensitization
Small-size CTP, mostly using platform-type sensitization, but different from the XY axis of the block light source in the third item, but the plate moves with the X-axis, and the light source is linearly scanned from one side to the other with the Y-axis. The X-axis moves to form the photosensitive surface, and some adopt the rotary Mirror to move, and some adopt different light-speed segment exposures, and there are fewer moving components.
5, non-mainstream inkjet imaging
There are two kinds of inkjet CTP methods: one is to directly image the blank printing plate with oily ink, which is cheap and easy, and the printing capacity is one or two thousand copies; the other is sprayed on the positive PS plate. The shading method is mainly film-free, but the printing pattern still needs to be exposed and developed again. All printing conditions are like the traditional PS version. For example, if the ink is 600dpi, it can only be used for rough work. If it is used above 1200X1200dpi, it is very useful. If the ink dot of 1800dpi is very fine, it is a cheap CTP method with potential for development in the future.