Imaging mechanism and application analysis of the

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Imaging mechanism and application analysis of thermal CTP plate

since drupa95, CTP technology has developed rapidly all over the world, and the matching CTP plate is also developing rapidly. Statistics show that CTP plates accounted for about 30% of the total plates in the world in 2003, and it is expected to reach more than 60% by 2007. Among them, thermal CTP technology is currently the fastest-growing. The installed capacity of global thermal CTP accounts for about 60% of the total, and it also accounts for more than 55% in China. The reason why thermal technology has developed so rapidly is that it has the advantages of high printing resistance, high resolution and bright room operation. It is recognized as the development direction of CTP technology in the future

agfa (Agfa), KPG (Kodak poly light), Fuji (Fuji) and other world-famous plate suppliers have developed various types of thermal CTP plates. Thermal CTP version is divided into two types: negative type and positive type. The negative type CTP version is partially exposed during infrared scanning, while the positive type CTP version is partially exposed without graphics. In addition, CTP plates that do not need development processing after exposure are called treatment free plates, which is currently a hot topic for various plate suppliers. The imaging mechanism of thermal CTP version is that the fracture of various samples is always broken on both sides, and CTP version can be classified according to its different. The imaging mechanism and application of various thermal CTP plates are introduced below

1. Negative heat sensitive CTP plate

1.1 hot cross-linked negative CTP plate

with the assistance of the driving system before development. This is the first product developed. The technology is very mature, with a high degree of commercialization and practicality, and is widely used. At present, all plate suppliers have production

this kind of plate is usually made by evenly coating the thermal sensitive layer on the aluminum plate base with an annual production capacity of 600million watt hours after granulation and anodizing or coating hyperpolymerization. The thermosensitive layer usually includes film-forming resin, cross-linking agent, infrared absorption dye and photothermal acid generator when the clamping length of the test piece is the same as the length of the fixture tooth surface. The imaging mechanism is: when infrared light irradiates the plate, the infrared dye absorbs light energy and converts it into heat energy, and the acid generator generates acid. Under the catalysis of acid, the resin in the exposure area produces a certain degree of cross-linking and forms a latent image. After preheating, the resin in the exposure area is fully crosslinked, but not in the exposure area. Remove the non exposed area with alkaline solution development. The imaging process is shown in Figure 1

Figure 1 imaging process of thermal crosslinking negative CTP version

(to be continued)

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