Photographic platemaking
Photographic direct platemaking technology originated in the 1960s and was first proposed by Kodak and applied for a patent. Later, there was 3M (1969), Mitsubishi Paper (1973) and AGFA (1973).
In the 1980s, China's China Institute of Printing Science and Technology and the Institute of Photographic Research of the Chinese Academy of Sciences already had photographic plate-making materials, but they were not widely used, and their technical feature was to get rid of negatives and plate-making. In the early 1990s, the computer introduced direct plate-making technology to form a CTP computer direct plate-making system. Its resolution was usually (1200-5000) dpi. All plate-making equipment used a computer-controlled laser to scan and image, and then developed through development, fixing and other processes. Into a printing plate.
The imaging quality of 1% -99% of dots with an accuracy of more than 200 lines is significantly better than that of traditional printing. China has introduced several such advanced equipment. Currently in the learning stage, because the supporting materials for products are being developed, the supply cannot be guaranteed.
CTPâ…¡ computer-to-machine direct plate-making technology
This technology was first introduced by Heidelberg at the International Printing Exhibition in the early 1990s. Since its launch, it has installed more than 1,000 units, of which more than ten have been introduced in China, mainly printing 200-5,000 copies of color short-page works. This technology is a digital printing process that combines plate making and printing. Special equipment and anhydrous offset plates must be used. All raw materials need to be imported.
CTPâ…¢ computer direct printing
For the first time in 1993, Agfa, IBM, Xerox and other companies successively produced their respective digital printing machines. The current installed capacity has reached more than 2,000, including 20 in China, with a resolution of 600-800dpi. Due to its low resolution and small format, the printing speed is slow, which is not very good in China. The printing principle is to use a special photoconductor film installed on the printing cylinder in advance, and the laser beam controlled by the computer is output to the surface of the printing cylinder Forming latent images and printing with toner or electronic ink is still in the initial stage of development.
CTPâ…£ digital proofing
At present, developed countries have increasingly adopted digital proofing technology. In the past two years, digital proofing CTPⅣ has been ranked second in the US major international printing technology statistics. China ’s CTPIV is still in the observation stage before it is rarely used in production.
The digital proofing system is developed on the basis of color printing technology. As long as various printing methods have the color management and pre-calibration functions required for printing, sufficient resolution and output format can form a digital proofing system. The physical parameters of the paper used for digital proofing in foreign countries are also gradually approaching that of ordinary paper, and some can already use newsprint.
Because the digital proofing system has simple proofing process, fast speed, consistent output results for many times, and meets the requirements of proofreading and reliability, the digital proofing system will soon be practically applied in China's printing industry, especially newspaper printing. Hebei Daily has already done many practical applications and has shown many advantages. Proofing with newsprint is just one step away. The difference is the specific work such as the removal of color management, the perfection of the pre-calibration function and the summary of the data.
CTPâ…¤ computer inkjet printing
Also known as pressure printing, the process is that the computer controls the inkjet head to spray very small ink droplets directly onto the paper to form graphics. The actual printing in the printing industry was more successful in the late 1990s by Israel's sclterx6240 digital printing press. CTP â…¤ is completely different from the current conventional printing process. The fundamental difference with CTP â…¢ is that CTP â…¢ is printed with plates; CTP â…¤ is printed without plates.
In this field, there are many latest technologies and cutting-edge technologies that have attracted our attention. At the beginning of 1999, Stone made a bold proposal to combine platemaking with traditional offset printing to give play to their respective advantages and form a new printing process. This process breaks the traditional pre-press-printing-post-press rule. Form a computerized plate, and print out the inkjet printing sample first. After satisfaction, the inkjet printing master plate realizes CTPâ…£ plateless inkjet printing or printing plate CTPâ… using the traditional offset printing process for mass printing.
The cyclic process route of printing after plate making and then printing. This cyclic process flow is a spiral-shaped new epoch-making printing mode. It makes the traditional offset printing technology on the top contemporary technology of CTP Ⅴ, ​​and theoretically solves the problem that CTP new technology is not easy to promote in China due to cost and other issues. The bold practice of Hebei Daily, with the support of Huaguang, Founder and other units, solved the problems of computer interface and so on. It achieved gratifying results in November 1999, successfully printed the newspapers that met the standards, and developed a plan that was suitable for China ’s national conditions, saving money and producing Effective and feasible CTP system.
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