Opportunities and challenges facing the hottest CT

2022-09-23
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Opportunities and challenges facing CTCP

since the drupa printing exhibition in 1995, computer direct plate making (CZP) technology has developed rapidly, causing a heat wave all over the world. Among them, thermal CTP technology is the best because of its high printing resistance, high resolution, open room operation, no pollution, simple process and other advantages. The CTCP (computer t0 conventionalplate) technology unveiled on drupa in 2000 also attracted great attention. In a short period of 2-3 years, CTCP technology has occupied a place in the diverse printing industry and become an important member of the CTP family. But it can be seen that, like any new technology, CTCP technology has some technical defects in addition to its unique advantages. This paper will introduce the technical characteristics of CTCP system, CTCP plate materials, and analyze the opportunities and challenges faced by CTCP

technical characteristics of CTCP

just as its literal meaning, CTCP technology is to realize computer direct plate making on the traditional prefabricated photosensitive plate (PS plate). At present, CTCP plate making machine generally adopts two technical methods: one is digital screen imaging technology (DSI) based on numerical control micro mirror device (DMD), German base has no corrosive media; The in setter produced by sprint company is dbj/t01 (5) 0 (2) 002 "technical specification for construction of external wall external insulation flexible water-resistant putty", which is based on this technology; One is the technology of using numerical control light valve to control the output laser of optical fiber to realize exposure imaging. This technology is adopted by dicon$lj version machine of purup eskofot company in Denmark. From the current development situation, the CTCP plate making machine with DMD technology of German basysprint company has made remarkable achievements and occupied the vast majority of the market share of CTCP plate making machine

compared with other CTP technologies, the biggest advantage of CTEP technology is the realization of computer direct plate making on the ordinary PS version. From the economic point of view, due to the use of the traditional PS version, not only the price of the plate is low, there are many kinds of plates to choose from, but also the post-processing conditions such as development are the same as the traditional PS version, which is compatible with the existing working environment. When using some foreign thermosensitive CTP plates, special supporting polymers are also used to mainly determine the composite process developer of the material. Their price is often several times or dozens of times that of ordinary PS plate developer. Therefore, the use of CTCP system can save the funds of supporting plates, developer and other consumables that must be purchased due to the purchase of CTP plate making machine. Especially for manufacturers with a large number of versions, this alone can save a lot of money every year. In addition, the plate making process is simple and can be operated in the open room, which is also the outstanding advantage of CTCP technology

from the perspective of imaging effect, because the CTCP system uses square pixels, the same effect of circular pixels at higher DPI can be obtained when the device output is low DPI. Moreover, with the development of DMD technology, the resolution of CTCP plate making machine can be further improved, and the imaging quality will be higher. The German forgra association has tested the point reducibility of different types of CTP technology, and the results show that CTCP system and thermal CTP system have the best point reducibility. In addition, the light source of CTCP plate making machine is a high-pressure mercury lamp, which costs less than other types of CTP plate making machine light sources and is easier to replace

due to the platform step-by-step exposure method, there is a large choice of plate size (size and thickness), and several plates can be exposed at the same time. Another advantage of the planar method is that the locating pin can be flexibly replaced according to different positioning systems. The CTP plate making system generally adopts the inner drum or outer drum vacuum fixing mode. The specifications of the optional plates of the same plate making machine are limited, and the requirements for the cutting accuracy of plates are high

of course, CTCP plate making system also has its shortcomings that cannot be ignored. Although CTCP plate making system can realize computer direct plate making on ordinary PS plate, the speed of plate making is not satisfactory because the sensitivity of ordinary PS plate is generally low. In order to cooperate with the promotion of CTCP system, Agfa, Fuji, Kodak and other companies have launched a series of plates with high sensitivity, making the CTCP plate making speed close to the thermal CTP plate making speed. However, in order to make CTCP more competitive, the plate making speed needs to be further improved

in addition, DMD is the core component of the plate making machine. In order to improve the resolution, the micro lens has increased from 300000 and 800000 to 1.3 million now. It can be seen that DMD is a very precise component, which brings some difficulties to its daily maintenance. The failure of any micro lens will affect the imaging effect to a certain extent. Once the DMD has major problems, it needs to be replaced, which not only affects the normal operation of the machine, but also costs a lot of money

CTCP plate making materials

as we mentioned earlier, in order to make CTCP plate making technology quite competitive, we must improve CTCP plate making speed. At the drupa printing exhibition in 2000, using Agfa n61, Fuji FNS or Kodak winner plates, the UV setter 710 CTCP plate making machine of basysprint company can produce L6 120 mm x 820 mm plates per hour. From October to January in 2003, the plate making machine of German basysprint company was exhibited at the Shanghai International Printing Exhibition in China, and the on-site demonstration was carried out with yn-ii negative PS version and yp-s positive PS version of the second film factory of lucky group. On February 4, 2003, Werter image technology (Shanghai) Co., Ltd. of Germany held an information conference on "CT CP plate making machine came to China" in Beijing. At the meeting e, Germany's basysprint company introduced that at present, there are about 60 kinds of PS plates in the world that can be made on the UV set ter 710 CTCP plate making machine, of which about 10 kinds of plates in China can be made on this CTCP plate making machine, but the plate making speed is different. Among the domestic plates, the vp-s PS version of Fuji Xingguang and the yn-ii negative PS version and yp-s positive PS version of the second film factory of lucky group can produce about ll ~ L3 large folios per hour. When using Agfa N550 or Fuji uvn-e, UV setter-710 can produce 20 plates of 1020 mm x 710 mm per hour. It is said that several large plate manufacturers have recently developed PS plates with higher sensitivity. It can be seen that there is still a certain gap between the plate making speed of domestic plate and foreign high-sensitivity PS plate on CTCP plate making machine, which is also lower than that of thermal CTP. According to the technicians of the second film factory, they have developed negative and positive PS versions with higher sensitivity, with a sensitivity of about 50 ~ 70 MJ/. If these two plates are industrialized and commercialized, the speed of CTCP plate making will be increased to 20 plates per hour

in cooperation with Guangxi Yulin Jinlong PS printing materials Co., Ltd., we have developed a series of non diazo naphthoquinone high sensitivity positive p s versions. The imaging exposure of the new non diazo naphthoquinone positive PS version is generally about 50 MJ/cm2, and some even below 30 MJ/cm2. Compared with the traditional positive PS version, the sensitivity has been greatly improved, which can well meet the requirements of CTCP system for high sensitivity of plates. In addition to the sensitivity is much higher than the traditional PS version, the other properties of the plate are not lower than the traditional PS version

compared with the positive PS version with the same sensitivity, the negative PS version can save about 30% of the plate making time, so the negative PS version with higher sensitivity is more suitable for CTCP plate making. Based on this, we use the principle of chemical amplification to develop a new negative PS version. The imaging principle of this new negative PS version is: under UV irradiation, the acid source produces acid, and the generated acid will undergo a chemical amplification and amplification process in the subsequent pre drying process, so that the crosslinking agent and the resin will react to become an insoluble part, and the image will be developed. The sensitivity of the new negative PS version is high, generally about 50 MJ/cm2, and there is room for further improvement. In addition to the high sensitivity of the new negative PS version and the non diazo naphthoquinone positive PS version, there are also some other excellent properties: higher printing resistance, generally more than 150000 printing times, higher resolution than the positive PS version, and excellent UV resistant ink performance. In particular, it can be developed with ordinary positive PS version developer. This kind of new negative PS plate, used together with CTCP plate making machine, may be popularized and applied in newspaper printing

the advantages of the new negative PS plate, such as high sensitivity, high resolution and high printing resistance, are obvious, and the use of this negative PS plate must add a pre baking process, that is, the exposed plate must be pre baked at about 120 ℃ ~ 130 ℃ for about 1 minute before development, which has become a limiting factor in the use of this plate and process. However, due to the wide adaptability of this plate pre drying, we can make full use of the existing equipment. We have conducted pre baking experiments on exposed plates on a variety of pre baking equipment. The heating methods include radiation heating and hot air heating. The results show that no matter how the plate is heated in the baking equipment, as long as the plate can be baked at 120 ℃ ~ 130 ℃ for 1 minute, a very satisfactory crosslinking effect can be obtained. For manufacturers who already have pre dryer or plate baking machine, they can make full use of the existing equipment; For those manufacturers who do not have pre drying equipment, they only need to buy a cheaper plate baking machine. Therefore, these manufacturers do not have to worry about the problem of pre drying equipment when considering the use of the new negative PS version. Even if the manufacturer introduces a plate baking machine because of the adoption of the new negative PS version, this investment is insignificant compared with the greater economic benefits brought by the adoption of a new technology

when we develop new plates, in order to make them competitive in the market, we not only pay attention to improving the technical indicators of new plates, but also carefully consider the selection of raw materials to ensure that we can not only get satisfactory products, but also make products have competitive advantages in price. These new PS plates use ordinary PS plate base and are coated on the production line of producing ordinary PS plates. Products with good appearance and performance can be obtained, and the production process has not increased to cause some problems in the experimental process. Although it is a new product, the selling price can still remain at the same level as the traditional PS plate. Compared with the expensive thermal CTP plate, the new PS plate with high quality and low price can relieve the worries of manufacturers who want to introduce CTCP plate making machine. In terms of plate materials, the conditions for CTCP system to enter the Chinese market are much more mature than the conditions for thermal CTP system to enter the Chinese market at the beginning

opportunities and challenges faced by CTCP

as a new technology, CTCP developed rapidly in its initial stage. According to statistics, the installed capacity of CTCP plate making machines in the world was only 50 in 2000, and nearly 500 in 2003. It is reported that at present, there are only three CTCP plate making machines in China. Compared with the thermal plate making machine market, the CTCP plate making machine market is still a virgin land. In China, a large printing country with diverse market demand, CTCP plate making system is an option for those manufacturers who want to introduce CTP plate making system

the technical characteristics of CTCP and the progress of domestic research and development of plates introduced earlier have revealed the development opportunities of CTCP. In particular, the high sensitivity PS version that has been produced and will be put into production is ready for CTCP plate making machine to enter the Chinese market. However, facing the strong competition of other CTP plate making technologies, the development of CTCP in China is also full of challenges. For those manufacturers who want to introduce thermal CTP plate making system, the price of thermal plates has always been an important factor. Although the price of imported thermal plates will not drop in a short time, the negative thermal plates produced by the second glue factory have

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