The digital micromirror chip technology (DMMC) uses an array of digital reflective micromirror systems and conventional UV light sources (eg, high-pressure mercury lamps). The micromirror system integrates hundreds of thousands of tiny mirrors, each of which The reflection state can be controlled independently by the computer, so that the light beam reflected from it can be modulated on the On/Off state to complete the digital exposure control. The surface array micromirror system can only cover a very limited area of ​​the printing plate, so the XY-direction movement must be done to cover the entire plate surface. This scanning structure is very similar to a conventional shuttle dryer, requiring a very high control accuracy of the moving mechanism, especially in the case of high resolution requirements.
From the point of view of plate material development, the appearance of UV scanning technology, especially the scanning technology using conventional UV light sources, has greatly eased the difficulties of direct plate material development and research. Most photochemical material systems, such as photopolymerization, photocrosslinking, photoaffinity changes, and even the traditional PS plate material systems, are very sensitive to light in this wavelength range. As long as the final beam of light reaching the plate layout has sufficient intensity (requiring that the loss of light energy during transmission and modulation of the scanning optics is minimized), it is possible to achieve acceptable scanning imaging speeds. Therefore, the concept of direct plate making of a traditional plate material (for example, PS plate) has been proposed, which is called CTcP (Computer To conventional Plate). From the perspective of long-term goals, UV-LD lasers and traditional UV light source scanning technology will directly affect the direction of future plate-making technology. Prior to this, the infrared laser thermal imaging system voice was very high, and it was considered as the direction for direct plate making in the future. The development of corresponding equipment and plates became the focus of the development of direct plate making technology.
The most significant advantages of infrared laser thermography are mainly manifested in (1) bright room operation performance, (2) apparent imaging energy threshold (ie, no energy accumulation effect in the imaging process), and (3) mature technology of high-power solid infrared laser light source (IR-LD and YAG), but the fatal weakness is the very low sensitivity (sensitivity). Thermal imaging material systems mostly rely on changes in the state of matter to achieve imaging records, such as thermal melting, thermal induced vaporization, thermal induced phase change, thermochemical reaction, etc., requiring that the temperature must be above the temperature of the corresponding state of change. Therefore, the physical stimulus (laser or heating head) must have enough intensity (power) to make all the energy absorbed by the plate contribute to the increase of temperature (approximately adiabatic conditions), so as to achieve sufficient change in state The temperature, otherwise, the absorbed energy will disappear in the heat exchange with the environment, and the temperature of the plate cannot reach a temperature sufficient to change the state of matter. This is why thermal imaging systems generally have no energy-cumulative effects (→ can achieve bright-room operation) and have significant imaging power thresholds (→clear image edges, high contrast).
On the other hand, change of state requires relatively high energy, and it is generally difficult to introduce a chain reaction mechanism (ie, the so-called amplification mechanism), and therefore the sensitivity (sensitivity) is relatively low, and the minimum imaging exposure is generally several hundred MJ/ Above CM2, much higher than other imaging material systems, such as photocrosslinking/photo-modification (tens of MJ/CM2), photopolymerization (tens of μJ/cm2), silver salt, and electrophotographic system (number μJ/CM2 )and many more. In order to make up for the shortcomings of the low sensitivity of the thermal imaging system, high power lasers with W/CM2 level or higher are generally required to achieve the plate making speed required for practical applications. This is not a very favorable choice. Judging from the trend of development, in the field of off-line direct plate making, the infrared thermal imaging system and the ultraviolet photosensitive imaging system will certainly become the focus of competition in the future.
Due to this diversity of direct plate-making scanning light sources, the platesetters are currently diversified. This is mainly reflected in (1) the introduction of serialized platesetters for different imaging systems by the same manufacturer and (2) the use of different laser sources in the same platesetter. (To be continued)
From the point of view of plate material development, the appearance of UV scanning technology, especially the scanning technology using conventional UV light sources, has greatly eased the difficulties of direct plate material development and research. Most photochemical material systems, such as photopolymerization, photocrosslinking, photoaffinity changes, and even the traditional PS plate material systems, are very sensitive to light in this wavelength range. As long as the final beam of light reaching the plate layout has sufficient intensity (requiring that the loss of light energy during transmission and modulation of the scanning optics is minimized), it is possible to achieve acceptable scanning imaging speeds. Therefore, the concept of direct plate making of a traditional plate material (for example, PS plate) has been proposed, which is called CTcP (Computer To conventional Plate). From the perspective of long-term goals, UV-LD lasers and traditional UV light source scanning technology will directly affect the direction of future plate-making technology. Prior to this, the infrared laser thermal imaging system voice was very high, and it was considered as the direction for direct plate making in the future. The development of corresponding equipment and plates became the focus of the development of direct plate making technology.
The most significant advantages of infrared laser thermography are mainly manifested in (1) bright room operation performance, (2) apparent imaging energy threshold (ie, no energy accumulation effect in the imaging process), and (3) mature technology of high-power solid infrared laser light source (IR-LD and YAG), but the fatal weakness is the very low sensitivity (sensitivity). Thermal imaging material systems mostly rely on changes in the state of matter to achieve imaging records, such as thermal melting, thermal induced vaporization, thermal induced phase change, thermochemical reaction, etc., requiring that the temperature must be above the temperature of the corresponding state of change. Therefore, the physical stimulus (laser or heating head) must have enough intensity (power) to make all the energy absorbed by the plate contribute to the increase of temperature (approximately adiabatic conditions), so as to achieve sufficient change in state The temperature, otherwise, the absorbed energy will disappear in the heat exchange with the environment, and the temperature of the plate cannot reach a temperature sufficient to change the state of matter. This is why thermal imaging systems generally have no energy-cumulative effects (→ can achieve bright-room operation) and have significant imaging power thresholds (→clear image edges, high contrast).
On the other hand, change of state requires relatively high energy, and it is generally difficult to introduce a chain reaction mechanism (ie, the so-called amplification mechanism), and therefore the sensitivity (sensitivity) is relatively low, and the minimum imaging exposure is generally several hundred MJ/ Above CM2, much higher than other imaging material systems, such as photocrosslinking/photo-modification (tens of MJ/CM2), photopolymerization (tens of μJ/cm2), silver salt, and electrophotographic system (number μJ/CM2 )and many more. In order to make up for the shortcomings of the low sensitivity of the thermal imaging system, high power lasers with W/CM2 level or higher are generally required to achieve the plate making speed required for practical applications. This is not a very favorable choice. Judging from the trend of development, in the field of off-line direct plate making, the infrared thermal imaging system and the ultraviolet photosensitive imaging system will certainly become the focus of competition in the future.
Due to this diversity of direct plate-making scanning light sources, the platesetters are currently diversified. This is mainly reflected in (1) the introduction of serialized platesetters for different imaging systems by the same manufacturer and (2) the use of different laser sources in the same platesetter. (To be continued)
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