The game between photosensitive resin version and

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The game between CTP's photosensitive resin version and thermal Version (Part 1)

at the drupa exhibition in 1995, the computer direct plate making technology has completely changed the prepress system. Compared with the traditional plate making process, CTP has eliminated the negative processing, manual plate making and plate assembling, thus greatly saving the time required for the prepress process and reducing pollution to a great extent. For general manufacturers, if the cost of purchasing a CTP equipment is doubled, the benefits brought by the above advantages of CTP will be doubled

the high precision of offset plate making has always been the development direction of prepress technology. Until now, several technological branches have emerged. At the 2008 drupa exhibition, these new branch technologies will meet the audience. In the 4-kai and 8-kai format markets, the thermal printing process is mainly used, and the UV laser technology is mainly used in the imprinting unit. Both processes are plate free printing, and suppliers are looking for solutions that can support inkjet printing of image signal plates

which process is the best? Each process 2. Precision measurement and control system with advanced microcomputer program control, multi-channel signal measurement and full digital closed-loop control. The speed control system of the friction and wear experimental machine is divided into two cases: constant speed and stepless adjustment. It is composed of microcomputer, measurement and control and test program software, multi-functional measurement and control board, driver, simulation and digital sensor. It has its own characteristics, advantages and disadvantages. The printing plate size, operation cycle and plate making cycle are the key criteria for evaluation. This is because the investment required for CTP investment is quite huge. However, due to the many advantages of CTP technology, the total investment of equipment will be recovered in a period of time

UV laser technology has enabled plate making to go out of the darkroom and enter the bright era. The standard for passing the tensile machine test is: gb/t 228 ⑵ 002 in the 1990s, the introduction program came out, so that the size of the film can be produced according to the plate specifications. Taking this opportunity, we call it computer direct film, and the 70100cm phototypesetting equipment came out. The equipment belongs to the inner drum structure, because this structure has more advantages than the winch type steel zigzag testing machine in terms of the installation natural environment and operation method in terms of the effect and cost of 4-color separation. On this basis, direct plate making was possible, so many suppliers at that time chose the inner drum phototypesetting equipment

however, the UV digital photosensitive plate in the equipment with inner drum structure cannot be exposed without sufficient light. Therefore, the supplier first studies how to improve the photosensitivity of the photosensitive plate. The first generation of photosensitive plates contained negative halides, which required at least 0.010mj/cm2 of light energy to meet the exposure requirements. Plates of this level allowed lower energy to complete the exposure. The photosensitive resin plate is also one of the first generation photosensitive plates. Its sensitivity is only 1/10 of that of the silver salt plate, that is, it requires 0.10mj/cm2 of energy. The blurred image source only takes up 10% of the total energy, while the other 90% of the energy comes from the preheating process. Similarly, preheating is also very necessary in the process of plate making

different exposure light can be selected according to different versions, such as argon ion light, neodymium ion light, helium ion light or neon light. All the above light sources are within the visible spectrum range, so the plate processing process must be illuminated by red light or in a completely dark environment. Therefore, the manufacturer must establish a complete spectrum system according to the needs of plate making, which will be a huge investment. The whole operation process must be carried out in a dark room without light

several years later, until drupa in 2000, thermal technology replaced the first generation of photosensitive plates. In drupa 2000, Agfa proposed a new solution to the problem of the sensitivity of the silver salt plate of the inner drum phototypesetting system: the exposure can be completed by 405 nm UV light. Compared with the previous exposure plate, this process allows the processing process to be carried out under the yellow light of a certain color gamut. A 05 MW ultraviolet laser transmitter is used as the light source. This is very economical and practical, and the technology is applied to the civil field, and the market potential of CD is huge. This makes many people give up the idea of manufacturing inner drum equipment and continue to operate their original industries. In 2002, Fujifilm developed an epoch-making photosensitive resin version with a 30MW ultraviolet light source, which many market observers predicted would completely replace the thermal technology. So far, this language has not been fully realized, because the principle of the photosensitive resin plate is basically the same, requiring high sensitivity. Theoretically, this is the same as the first generation photosensitive plate, and the connecting material in the plate structure needs unstable chemicals, which is still very immature. In addition, the preheating unit is also essential. In other words, the inner drum type equipment is relatively simple compared with the outer drum type equipment, so the UV plate making machine is more competitive in the folio and quarto format versions. In the 4-open and 8-open format versions, the main competitor of UV plate making equipment is the thermal plate making machine

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