CTP Computer Direct Plate Making by Poor People

The CTP computer directly plate-making not only saves the negative film output project, but also reduces the troubles of the film material and its development and fixer recycling. But on the other hand, the equipment cost of CTP's plate output machines is very high, ranging from 7 to 8 million to 10 million. Not all output centers and printing companies can afford it, and CTP India The price of the edition is often twice the traditional PS version or more, which is a little higher than the sum of the two materials of the film plus the PS version. This kind of burden may not be worth caring about in some highly efficient newspaper or profitable printing industry. In some printing industries with low profits, they are looking forward to the traditional PS version. CTPs that use ultraviolet and particle convex mirrors can make a path for the future.

The simplest CTP is to use the traditional PS version and platform inkjet printer. The approach is to put the unexposed positive PS plate into the printer stage, and then use the inkjet printer to spray the page file on the PS plate (oily ink is more easily attached Water-based ink is easy to wash away), etc. After drying, it is put into ultraviolet light to make moderate exposure, because the imprinting ink jet is directly attached to the surface of the printing plate, and there is no need for vacuum processing of the negative film and PS plate, and it will not produce bad adhesion. , and then completed by rushing version. This equipment is not expensive, the material is completely the same with the current CTP plate making, the only can not be compared with the advanced CTP is, inkjet list machine only about 600dpi resolving power, only suitable text, lines and 80 lines around the network line prints, and then fine Some texts and outlets need to be developed in the future.

The CTP of the large-size rubber plate is a CTP sensor using the original CTF print-printer and changing the film to a polyester substrate. Since the plate material for printing plates is thicker than the CTP film, the laser focus must also be changed. However, the main difference is the difference in the way of development. The original CTF was traditionally developed by oxidation. However, the silver salt of CTP is developed by means of infection, that is, two-stage development. The photosensitive portion is first developed as a black water-absorbing non-printed portion, and then two times. The non-photosensitive silver salt infection surface emerged as imprint, in this way the equipment can be used for film and printing plate, and the price of the plate is low, but the printing plate is difficult to overprint due to long time rolling and stretching, and the printing quality is slight. Times.

Small-size non-aluminum CTP plates, including the above-mentioned polyester silver plates or paper-based plate materials, are used only for laser toners for imaging and baking of resin toners, and also for obtaining printing plates using a charged plate material. The long-term automatic version of the package plate is one of the features of the small-size CTP, which can significantly reduce the production cost.

Like the Riso Express printer, using wax paper perforation technology to reach digital control imaging, it is naturally a very low-cost, fast-working CTP, but in the small size, color and black and white work areas.