I. Diversified development of the CTP Plate Prepress digital platemaking process has two major engineering reform steps: (1) no film, and (2) no plate. Filmless platemaking process is CTP, including COMPUTER TO PLATE, COMPUTER TO PRESS. The latter can be called on-machine platemaking. It is a combination of a printing machine and a platemaking machine. It can receive page files and complete plate production, but also can do Accurate positioning and overprinting are accurate. Since 1990, the GTO-DI direct imaging printer in Heidelberg started with tungsten steel discharge technology. Most of the plates use waterless offset printing technology with silicone layer for ink repellent. Recently, they have changed to use water-based offset printing, such as SM DI-74 in Heidelberg. , Dainippon Screen TURE PRESS, the latter uses Mitsubishi Polyester base silver salt photosensitive technology, must be on-board development. On-machine platemaking overcomes overprinting difficulties caused by plate expansion. However, these systems are all fixed by the machine manufacturer's plate, light (heat) light source, the user has no additional choice, the possibility of change. The flexographic CTP also uses almost infrared lasers, burns into a rugged version or burns the black mask, and then uses a photographic method to form the printing plate. The gravure CTP is concentrated in the mechanical engraving method, and only THINK Corporation in Japan uses laser photore-development, ie, chemical etching. The screen printing CGP is focused on the platform type spray black wax spot to block the light, forming a non-offset version of the plate. The above-mentioned development direction of these technologies is the same as the on-demand printing of variable graphic texts without printing plates. This is not the scope of this article.
Off-grid CTP plates for off-line platemaking currently consist of four main categories: (1) silver salt plates; (2) high-sensitivity photosensitive resin plates; (3) heat-sensitive plates; and (4) non-horizontally-printed plates. There is a composite plate in which a photosensitive material is coated with a silver salt photosensitive material, which must be rephotosensitized after the silver salt layer has been developed. This is the mainstream of the early CTP plates. It is rarely used now and is not discussed here.
The silver salt version is developed from the direct photosensitive silver salt version of the camera. It can accept light sources including argon ion laser, frequency-doubled xenon laser, helium neon laser and laser diode. It has a wide range of receiving power and energy. Low illumination is enough. The disadvantage is that the darkroom or black box operation must be used, and the effluent that is developed, fixed, washed after rinsing must be treated strictly in accordance with regulations. When used in the field, the printing plate has poor ink receptivity, and the printed product has a low visual contrast and is an older process, which has already been eliminated.
The high-sensitivity photosensitive resin plate, also using the traditional PS plate, is similar to the photosensitive resin sensitization technology, and uses an argon ion laser blue light or a frequency-doubling holmium laser green light, and is sensitized at a specific wavelength. Must also operate in the darkroom, rush version of the skills are more exquisite, must be as soon as possible after the photosensitive version. And to use about 120 degrees heat radiation source preheat for about 30 seconds, so that the film surface of the photosensitive part of the acid reaction, and through the bottom layer to normal plate, so sensitive to the plate and the heating, affect the network and The reproduction of the text has certain problems in stability. After the printing plate is finished, the blue plate lines are well contrasted, and the ink receptivity is the same as that of the general PS plate. It can also be used for high-temperature baking plates to increase the resistance to printing force. However, in the reproduction of fine mesh and FM network points, this version is inferior in several types of media, and usually only reaches 200 lines with 2%-98% of dot reproduction. It will, like the silver salt plate, gradually enter history.
The thermal plate is the most promising plate in the CTP plate. The reason is that it can be operated in the bright room, and it can complete extremely fine dot reduction and can reproduce 1%-99% of the 800 lines. Among them, it is divided into preheating type, preheating type, and heat treatment type. The preheated plate has instability, its performance changes due to preheating conditions, its heat-sensing temperature is about 56 degrees Celsius, and the plate material is transported by a container truck. The temperature rise in the container reaches 60-7 degrees Celsius. It is a common thing. Although its light source requirements are low and the number of heat joules is easy to reach, it is the type of media that will soon be eliminated. There is a period of time that does not require preheating of the plate type and the thermal plate type CTP plate that does not require extruding. Because the optimal heat source of the light source that is not required for thermal plate processing is hundreds of times higher than that of the preheated plate material, sufficient vaporization or sublimation of the heat sensitive film is possible. Therefore, the price of the light source amounts to tens of thousands each. The US dollar has a life expectancy of only six months to a year or so. For some time-sensitive media, bright room operations are required. Once the sensation is completed, it can be printed on the machine. This is the best mode of operation.
CTP plate without horizontal printing plate, introduced by Japan TORAY company, is basically a type of infrared thermal plate, and does not require any plate-making process, that is, it can be extremely fine pattern, and is similar to most CTP plates. The only difference is the large size, the use of aluminum base printing ink, operating conditions, follow the non-horizontal printing, compared with the traditional offset printing process with a wet system is completely different, in terms of quality stability and dot reproducibility, Better than traditional flat printing, especially suitable for high-precision outlets and FM outlets.
Based on the performance of the above media, different types of media correspond to different light sources, operating environment, processing conditions, process length, printing quality and cost conditions. If the thermal plates cost $3 more per piece than other CTP plates and 25,000 plates per year are used, the light source consumes $30,000 more per year. This system adds only the above two items to increase the total cost per year. Up to 105,000 U.S. dollars, and after all, this year, the ideal system will be repulsive. In business and business, we cannot ignore the results of investment benefits and rashly use more "ideal" systems.
Second, the type of plate output machine (direct plate machine) and the advantages and disadvantages Plate output PLATESETTER is basically similar to the principle of the film output machine IMAGE SETTER, there are four types of inner drum type, outer drum type, winch type, platform type. Because the thickness and weight of the plate are thicker and heavier than the film, the forces are not similar when moving. The inner drum type is originally considered the most ideal type, because this type of photosensitive plate is fixed, relying on high-speed rotation of the laser mirror, the point light source is distributed into a linear photosensitive area, and then through the light source and the reflection system to complete the whole movement. Format sensitive action. Therefore, the most critical technology of sensitization focuses on the high-speed and high-precision rotation of the mirror, otherwise it is easy to sense the light beam path is longer and there is a deviation. However, only a single beam can be used for the inner drum type, and the intensity of the light source must be very strong. In particular, when the thermal plate requires high Joules, the equipment price is higher. In addition, it is not yet obvious, but it will be used later. When vaporizing and sublimating the CTP plates without development, the inner drum type exhaust and dust removal ability is a big problem. The purchaser wants to change the visible light laser to the thermal laser, and it is the third generation of the CTP plate free of development. When it comes to improving and improving, I am afraid that it is powerless. (To be continued)
Off-grid CTP plates for off-line platemaking currently consist of four main categories: (1) silver salt plates; (2) high-sensitivity photosensitive resin plates; (3) heat-sensitive plates; and (4) non-horizontally-printed plates. There is a composite plate in which a photosensitive material is coated with a silver salt photosensitive material, which must be rephotosensitized after the silver salt layer has been developed. This is the mainstream of the early CTP plates. It is rarely used now and is not discussed here.
The silver salt version is developed from the direct photosensitive silver salt version of the camera. It can accept light sources including argon ion laser, frequency-doubled xenon laser, helium neon laser and laser diode. It has a wide range of receiving power and energy. Low illumination is enough. The disadvantage is that the darkroom or black box operation must be used, and the effluent that is developed, fixed, washed after rinsing must be treated strictly in accordance with regulations. When used in the field, the printing plate has poor ink receptivity, and the printed product has a low visual contrast and is an older process, which has already been eliminated.
The high-sensitivity photosensitive resin plate, also using the traditional PS plate, is similar to the photosensitive resin sensitization technology, and uses an argon ion laser blue light or a frequency-doubling holmium laser green light, and is sensitized at a specific wavelength. Must also operate in the darkroom, rush version of the skills are more exquisite, must be as soon as possible after the photosensitive version. And to use about 120 degrees heat radiation source preheat for about 30 seconds, so that the film surface of the photosensitive part of the acid reaction, and through the bottom layer to normal plate, so sensitive to the plate and the heating, affect the network and The reproduction of the text has certain problems in stability. After the printing plate is finished, the blue plate lines are well contrasted, and the ink receptivity is the same as that of the general PS plate. It can also be used for high-temperature baking plates to increase the resistance to printing force. However, in the reproduction of fine mesh and FM network points, this version is inferior in several types of media, and usually only reaches 200 lines with 2%-98% of dot reproduction. It will, like the silver salt plate, gradually enter history.
The thermal plate is the most promising plate in the CTP plate. The reason is that it can be operated in the bright room, and it can complete extremely fine dot reduction and can reproduce 1%-99% of the 800 lines. Among them, it is divided into preheating type, preheating type, and heat treatment type. The preheated plate has instability, its performance changes due to preheating conditions, its heat-sensing temperature is about 56 degrees Celsius, and the plate material is transported by a container truck. The temperature rise in the container reaches 60-7 degrees Celsius. It is a common thing. Although its light source requirements are low and the number of heat joules is easy to reach, it is the type of media that will soon be eliminated. There is a period of time that does not require preheating of the plate type and the thermal plate type CTP plate that does not require extruding. Because the optimal heat source of the light source that is not required for thermal plate processing is hundreds of times higher than that of the preheated plate material, sufficient vaporization or sublimation of the heat sensitive film is possible. Therefore, the price of the light source amounts to tens of thousands each. The US dollar has a life expectancy of only six months to a year or so. For some time-sensitive media, bright room operations are required. Once the sensation is completed, it can be printed on the machine. This is the best mode of operation.
CTP plate without horizontal printing plate, introduced by Japan TORAY company, is basically a type of infrared thermal plate, and does not require any plate-making process, that is, it can be extremely fine pattern, and is similar to most CTP plates. The only difference is the large size, the use of aluminum base printing ink, operating conditions, follow the non-horizontal printing, compared with the traditional offset printing process with a wet system is completely different, in terms of quality stability and dot reproducibility, Better than traditional flat printing, especially suitable for high-precision outlets and FM outlets.
Based on the performance of the above media, different types of media correspond to different light sources, operating environment, processing conditions, process length, printing quality and cost conditions. If the thermal plates cost $3 more per piece than other CTP plates and 25,000 plates per year are used, the light source consumes $30,000 more per year. This system adds only the above two items to increase the total cost per year. Up to 105,000 U.S. dollars, and after all, this year, the ideal system will be repulsive. In business and business, we cannot ignore the results of investment benefits and rashly use more "ideal" systems.
Second, the type of plate output machine (direct plate machine) and the advantages and disadvantages Plate output PLATESETTER is basically similar to the principle of the film output machine IMAGE SETTER, there are four types of inner drum type, outer drum type, winch type, platform type. Because the thickness and weight of the plate are thicker and heavier than the film, the forces are not similar when moving. The inner drum type is originally considered the most ideal type, because this type of photosensitive plate is fixed, relying on high-speed rotation of the laser mirror, the point light source is distributed into a linear photosensitive area, and then through the light source and the reflection system to complete the whole movement. Format sensitive action. Therefore, the most critical technology of sensitization focuses on the high-speed and high-precision rotation of the mirror, otherwise it is easy to sense the light beam path is longer and there is a deviation. However, only a single beam can be used for the inner drum type, and the intensity of the light source must be very strong. In particular, when the thermal plate requires high Joules, the equipment price is higher. In addition, it is not yet obvious, but it will be used later. When vaporizing and sublimating the CTP plates without development, the inner drum type exhaust and dust removal ability is a big problem. The purchaser wants to change the visible light laser to the thermal laser, and it is the third generation of the CTP plate free of development. When it comes to improving and improving, I am afraid that it is powerless. (To be continued)
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