CTP computer direct plate making method
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The direct plate making of the CTP computer not only saves the film output engineering, but also reduces the troubles of the film material and its development and fixing solution recycling process. On the other hand, the equipment price of CTP's plate output machine is very high, from seven to eight million to more than ten million yuan, not all output centers and printing plants can afford to avoid, and CTP printing The price of the version is often twice or more than the traditional PS version, which is higher than the sum of the two materials of the negative film plus the PS version. This burden may be in some efficient newspapers or high-profit printing industry, and may not care, but In some of the meager printing industry, they are hoping for the traditional PS version, using CTP with ultraviolet and particle convex mirrors, which can make a way for the future.
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The simplest CTP is to use the traditional PS version, and the platform type inkjet printer, the method is to put the unexposed positive PS plate into the printer table, and then spray the page file on the PS plate with an inkjet printer (oily ink is easier to attach) The water-based ink is easy to wash off. After drying, it is placed under ultraviolet light to make a proper exposure. Because the inkjet ink is directly attached to the surface of the printing plate, there is no need to have a negative film and a PS plate vacuum procedure, and there is no bad adhesion. And then the completion of the redemption. This kind of equipment is not expensive, the consumables are completely the same as the current CTP plate making. The only thing that can't be compared with the advanced CTP is that the inkjet list machine has only about 600dpi resolution, only suitable for text, lines and 80 lines of network cable printing, and then fine. Some texts and outlets are for future development.
The CTP of the large-size offset version is a CTP-sensitive material that uses the original CTF print output machine and converts the negative film to a polyester substrate. Since the plate for the plate is thicker than the CTP film, the laser focus must also be changed. However, the most important difference is the development method. The original CTF is a traditional development method of oxidation, but the silver salt development of CTP is contagious development, that is, two-stage development, and the photosensitive portion is first developed into a black water-absorbing non-printing portion, and then twice. The unexposed silver salt is spread into the printed surface. In this way, the equipment can be used for both negative film and printing plate. The price of the plate is low, but the plate is stretched for a long time, and there is a difficulty in overprinting. Times.
Small-size non-aluminum CTP plates, including the above-mentioned polyester silver plate or paper-based plate, some of which are only required to be image-baked by resin toner, or printed with a charged plate to obtain a plate. The long-term automatic supply of the packaged plate is one of the characteristics of the small size CTP, which can greatly reduce the production cost.
Like the Riso printer, using wax paper perforation technology to reach digital control imaging, it is naturally a very low cost, fast working CTP, but in small size, color and black and white work.