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In addition, because of its short wavelength, there is an advantage that the exposure site is small, and it is expected that it has high productivity, low cost, and can be used in bright rooms. Only a part of the output energy reaches 30mW, but most of them are 5mW or lower, and they can only be used for silver salt diffusion type plate applications. Some people hope that it can expose the diazo PS plate, but it needs tens of watts of output, but no high-output ultraviolet laser has been developed yet. W light as a light source, using the original diazo PS version exposure, the original developer can also be universal. However, lasers with a single wavelength have superior stability and light quantity stability and are easy to control. Although the UV lamp as a light source device has made a lot of improvements, there is still the problem of low resolution and slow exposure.
Under the existing conditions, the market share of thermal plate is still increasing, the world is about 40%, in Japan is 60% -75%, is in the direction of the development of the plateless, D. The turning of the printing press is also in progress.
In summary, although the methods for forming images on CTP output machines have their own advantages and disadvantages, the benefits of introducing CTP output machines at present are more important than quality and price. If we want to replace 100% with CTP, we must maintain the existing quality, but also need to speed up, automation does not lag behind the original process and a cheaper output machine, while the supply of the plate must be open.
The trend of media
The CTP plate is broadly classified into silver salt diffusion, photosensitive resin, and thermal type. Plate and output light source are closely related.
The silver salt diffusion type is a positive type plate material, because of its high sensitivity (about 100μJ/cm2), even low-power laser (about 10mW) can also be entered, the productivity is also high, the photosensitive wavelength is wide, so long ago for For the use of CTP. Although the resistance force is improved, it is slightly different from the photosensitive resin type or the heat-sensitive type in which the anti-printing force has been improved by the baking treatment. Due to the complexity of the development process, there are many types and amounts of silver salt waste liquid, as well as the maintenance of the developing machine, and the pressure of the photosensitive resin and the heat-sensitive type.
The photosensitive resin type is a negative type plate material and has a slightly lower sensitivity than silver salt (about 200 μJ/cm 2 ). Because the surface of the anti-oxidation coating is used to cause laser scattering, the resolution is not as good as that of the silver salt plate and the thermal plate. Although these problems remain to be solved, they have more room for general use and superiority in terms of stability and high speed. In addition, the above-mentioned high-sensitivity version produced by the corresponding UV laser has been welcomed.
The thermal plate has undergone the transition from the first-generation negative-graphic type, the second-generation positive-type graphic, and the third-generation free-plate type. The sensitivity of the printing plate is the lowest compared to silver salt and photosensitive resin (100 to 200μJ/cm2), although the productivity is low, it can work in the bright room and the resolution is high.
The first-generation negative-graph type needs to be warmed up before development. In addition to the high equipment load, it is also necessary to manage the time-dependent changes of the laser, the plate, the developer, and the like. The second-generation positive image type does not need to be warmed up, but when the exposure part is used as part of the image, especially when the exposure is different from that of the printer, it must be noted that the printing direction Left and right shall not be affected by this image part. The third generation of the imprint-free version eliminates the development process and not only frees up the cost of the equipment and the conditions for the storage and management of developer, but also has great promise from the environmental perspective.
Recently, no-heat-preventive negative-tone patterns (50mj/cm2) and corresponding old LD-sensitive negative patterns (50-100mJ/cm2) have also been developed, increasing the options available.
summary
The number of alternatives for products such as workflows, output machines, plates, etc. has increased, and the most suitable environment for each part has been prepared. Only if we want to rely on the CTP to achieve the original expectations of reducing costs, shortening delivery time, and improving quality, we must plan the entire process from prepress to printing to make it the most appropriate job. To this end, printing companies, customers, and manufacturers should build open and balanced environments and seek standardization. (Finish)
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Reassess CTP (4)
Photosensitive type has recently attracted the attention of a CTP output device using an ultraviolet LD. After the semiconductor laser was developed in Japan, it was used as an optical head for reading DVDs, and it has been converted to civilian use. It is inexpensive and the wavelength of the laser light is just in the visible light region. It is necessary to operate under safe light, but this photosensitive plate has been made available in the bright room.