In recent years, with the continuous advancement of national green printing and the continuous innovation of printing raw materials and other processes, chemical-free CTP plates have gradually come into people's attention and began to be adopted by some printing companies that value green production. Here, I will introduce the use of chemical-free CTP plates in our factory. Selection of CTP plate without chemical treatment The chemical-free CTP plate refers to the CTP plate that can be printed directly on the machine without chemical development after the exposure is completed. The development mechanism of the chemical-free plate materials varies, some of them use the fountain solution to rinse the printing plate to complete the development, and some are to decompose the photosensitive part on the printing plate by exposure, and help by brushing and glue soaking. Plate development. The biggest challenge faced by printing companies in using chemical-free CTP plates is the problem of plate suitability. Because the chemicals used by printing companies (such as plate cleaners, fountain solutions, car wash water, alcohol, etc.) have many brands and different ingredients, the maintenance and working conditions of printing units vary greatly, and the types of inks and paper are different. Maintaining consistent plate performance in such a complex environment is an important indicator of the quality of the plate. Therefore, the author believes that before choosing the chemical-free CTP plate, it is necessary to understand and trial in small batches. During the trial process, in addition to the indicators such as the dot restoration on the conventional CTP printing plate and the durability, it is also necessary to focus on the dot conditions on the printing plate after printing. Because in actual production, we often find that CTP printing plates will have a certain percentage of dot loss from pre-press to printing process. Although the loss of this part is not large, it is still very important for the bright tone area of ​​the picture. If the control is not good, it will often cause the highlight part to be screened, affecting the printing quality. However, the loss of outlets between different brand plates is different, and it is necessary to focus on the trial and make a horizontal comparison. In addition, when selecting chemical-free CTP plate materials, the company's version checking requirements should be evaluated. Because the mainstream chemical-free CTP plates currently on the market, some of the plates are still blue when they are on the machine. The non-graphics materials need to be on the machine and are taken away by the dampening solution during the printing process, so they are on the machine. The readability of the former printing plate is poor, and if there are problems, it will be discovered after the computer is installed; and some chemical-free printing plates have better version checking, which is consistent with the ordinary CTP version. Therefore, when choosing, we must evaluate the requirements of the enterprise on the plate reviewability and make a reasonable choice. At present, our company is using Agfa N94-VCF chemical-free plate, in a complex printing environment, it has high chemical resistance and mechanical resistance, in our company KBA, Gauss, Manroland Waiting for the report to be in good use. Moreover, even if it is printed on low-quality paper, it can achieve high printing accuracy, and the durability can fully meet the needs of our factory, and has good plate-checking ability. Like ordinary CTP version, it can perform the layout content before the machine. Necessary inspection. Precautions for the use of chemical-free CTP plates At present, most printing companies that use chemical-free CTP plates have the experience of using ordinary CTP plates. Therefore, the author combines the difference between the use of ordinary CTP plates and chemical-free CTP plates to explain the precautions for the use of chemical-free CTP plates. First of all, compared with the use process of ordinary CTP plate materials, the chemical-free CTP plate material is much simpler in the rinsing link, eliminating the three steps of pre-washing, washing and applying protective glue. Due to the reduction of processes, it has more advantages in stability and reliability, but we also need to pay attention to some problems that may exist, such as: due to the chemical treatment-free CTP plate minus the pre-washing and washing In the process of operation, it is inevitable that a certain amount of chemical liquid will be brought to the rubber roller and the reversing device during the publishing process. Although the chemical liquid is neutral, it will not produce crystalline substances, and it can be easily wiped off with water However, if it is not cleaned regularly, these residual liquids will also become sticky and thick. If it sticks to the surface of the printing plate, it will easily damage the surface of the printing plate. Therefore, we should pay attention to cleaning in peacetime. Second, under normal circumstances, the sensitivity of chemical-free CTP plates will be weaker than that of ordinary CTP plates. Therefore, during use, the exposure capability of the CTP plate-making machine should be increased accordingly. For example, while increasing the exposure parameters, It is necessary to pay more attention to the change of laser energy in daily test data. If the CTP plate-making machine has been used for many years, it is easy to produce laser energy attenuation, and the CTP lasers currently used have a certain service life. When you are close to the service life, reach a certain working time, or reach a certain publication volume, you must pay special attention . At this time, there are two main points of concern. The first is to pay attention to the measurement and control strips that are added to each plate at the time of publication to reflect the quality of the plate, and the second is to monitor the relevant test data results after each maintenance cycle. If the laser is attenuated, it will generally be manifested in the following aspects: the number of levels on the publishing measurement and control strip changes, the printing plate durability is reduced, and small dots are easy to lose. Revenue from the use of chemical-free CTP plates Good stability and good for equipment maintenance is a major feature of chemical-free CTP plate. Photosensitive CTP equipment is generally aimed at newspaper users. Such users have high requirements for plate-making speed. However, during the high-speed operation of the equipment, unstable quality often occurs. After our company uses the N94-VCF chemical-free CTP plate, the stability of the printing plate has increased due to the reduction of pre-washing and washing steps. More importantly, for our front-line operators, the deepest experience is that after using chemical-free CTP plates, equipment maintenance becomes extremely simple. It turns out that the developer is strongly alkaline when using ordinary CTP plates. A large amount of crystalline material will be produced during the plate-making process. It will solidify on the rubber roller and the tube wall after a long time, block the filter element and the pipeline, and it is very troublesome to clean. The original clean rubber roller has also been roughened, making it easier to crystallize, and some rubber rollers will become hard, etc., and need to be replaced after a certain period of use. But now that the developing glue is neutral, there is basically no crystallization. Every maintenance, basically wipe it with clean water and gauze, and the operation intensity of employees is greatly reduced. The author believes that the longer the chemical-free CTP plate is used, the more profound its benefits will be. As a practitioner in the printing industry, whether it is a basic manager of the pre-press workshop or a long-term employee in the production line, they believe that the use of chemical-free CTP plates can not only achieve green and environmentally friendly production, but also contribute to the sustainable development of the industry. , Can also contribute to the realization of open source and throttling for enterprises.
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