Laser technology that is the most popular to promo

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Laser technology to promote the modernization process of printing Abstract: the seeay layers emphasis on expiring significant application of the laser modulation scanning D Inlroduction from both computer to plate and computer to print ereby making further understanding of computer to yword: light modulator, computer to print; Data processing

laser is a new discipline based on optics, atomic physics and electronic technology. Since the birth of the first laser in the world in the 1960s, laser and laser have still failed to reach an agreement on the specific matters of the implementation of the cooperation plan. Optical technology has developed into an important high-tech. Its theory and application have revolutionized many technical fields. The printing industry has entered the era of "light" and "electricity". This paper discusses the important position and application of laser technology in modern printing technology based on the influence of laser on the development of printing modernization

first, laser modulation

laser Zhujiang life insurance once said that it can be used as a tool to transmit information. The process of loading the information to be transmitted (digital images and words) into laser radiation is called laser modulation. Because laser plays the role of "carrying" information, it is called carrier wave

the commonly used modulators in printing mainly include electro-optic modulator and acoustooptic modulator. Acoustooptic modulators are in the majority in practical applications. Acoustooptic modulator is composed of acoustooptic medium, electroacoustic transducer, sound absorption device and driving power supply

the acoustooptic medium of acoustooptic modulator commonly used in printing equipment is lead molybdate (PbMoO4) crystal. The piezoelectric crystal of the electroacoustic transducer is lithium niobate (LiNbO3), which uses the anti piezoelectric effect to form an ultrasonic field due to the mechanical vibration generated under the action of an external electric field. It plays the role of converting the modulated electrical signal into an acoustic signal, and is driven by the modulated power supply. When the laser passes through the acoustooptic medium, due to the interaction between light and ultrasonic field, Bragg diffraction occurs, and the first-order diffraction light is output. When the amplitude of sound wave changes with the modulation signal, the intensity of diffracted light will change accordingly. The output light is periodically modulated light. Here, the modulator is also used as an electro-optical converter in the optical system, that is, it converts the graphic information electrical signal output by the computer into an optical signal

Second, the modulator in computer direct plate making (CTP) technology

in printing, the modulator has become an indispensable and important device for transmitting graphic information. In the early stage, it was used in laser engraving machines, electronic scanning color separators, laser phototypesetters, laser printers and other equipment. With the development of printing technology, the newly emerged computer direct plate making (CTP) technology, also known as film free plate making, is a high-tech developed rapidly in the 1990s. It records the digital graphic information processed by the computer directly on the printing plate through laser beam modulation scanning. Therefore, the plate making equipment is composed of a computer prepress processing system and a laser plate making machine. At present, dozens of models have been launched, and their principles are roughly the same. They all use computer-controlled laser beam modulation scanning plate imaging technology

Figure 2 shows the lasertie 100 fluv laser direct plate making system, which consists of an electronic computer, an argon ion (ar+) laser, an acousto-optic modulator, a polyhedral rotating mirror and F θ Composed of objective lens. The electronic computer transmits the processed digital graphic information to the electroacoustic transducer of the acoustooptic modulator. At this time, after the laser beam is modulated by the acousto-optic modulator, its first-order diffracted light shoots at the polyhedral rotating mirror, and then passes through F θ The objective lens is scanned and exposed on the printing plate, so as to directly make an offset printing plate. The printing plate has the advantages of good quality and fast speed

the commonly used lasers in ctplate computer direct plate making technology are argon ion lasers (488nm) and (514.5nm), Nd doped yttrium aluminum garnet lasers (1, 06 μ m) And He Ne laser (632.8 μ m) Most of them use air-cooled argon ion lasers. It can be seen that the computer direct plate making technology can omit the intermediate process between the original plates in traditional printing. It is suitable for light printing and newspaper printing of fast and small batch production. Further use in official printing has become its future development direction. It plays an important role in realizing the modernization of printing. Dbj01 ⑶ 8 ⑵ 002 "technical specification for construction of external wall external insulation polymer cement mortar adhesive" is used

Third, modulator in digital printing technology

digital printing is based on relatively perfect computer data processing technology, and organically combines laser modulation scanning imaging technology with high-tech photosensitive materials and new printing inks, so as to realize the digital integration of computer control in the whole printing process. It is a modern printing system with a new concept and process, which is completely different from the traditional printing concept and process

the digital printing process is shown in Figure 3, in which the laser modulation scanning imaging technology is mainly used in the machine-made version. During plate making, the color separation data signal (monochrome pixel digital signal) is input into the laser controller to emit synchronous monochrome laser beam, which is converted into plus data signal by rip. Carry out laser modulation scanning imaging on the printing plate cylinder of gb/t12160 (2) 002 "Regulations on extensometers for uniaxial experiments". The photosensitive materials on the cylinder form patterns that can adsorb ink or toner after sensitization, and then they can be printed. With the different photosensitive materials of printing plate, the principle of plate making can be roughly divided into two categories: one is laser electrostatic imaging. Such as indigo eprint1000 and omuius digital printing machines. The other is silicone rubber type of waterless offset printing plate. For example, quickmaster DIC of Heidelberg company, 74karat digital printing machine of KBA company and saiangel company, etc. Digital printing equipment has roughly the same laser modulation scanning imaging system. The laser of this system usually includes argon ion laser and semiconductor laser, while the acoustooptic modulator acoustooptic crystal is lead molybdate (pbmo04), and the piezoelectric crystal of electroacoustic transducer is lithium niobate (LiNb03). The modulator is still an important and indispensable core device for transmitting graphic information

IV. conclusion

digital printing is an important symbol of modern printing. Realize personalized on-demand printing. That is, the realization of dynamic or variable image printing will have a major impact on the traditional printing process. Another revolution in traditional printing. It involves a variety of high and new technologies, such as computer information processing technology, laser technology, material science and so on. They are an organic whole. Therefore, laser technology should also be one of the indispensable high and new technologies to promote modern printing

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