With green The printing concept has gradually penetrated into the hearts of the people. Choosing green materials and adopting clean production methods has become the main measure for printing enterprises to implement green printing. Our company has long recognized the importance of green printing. Combining with the actual situation of the company, we started from the three aspects of prepress, India and India, and launched a green strategy. Introducing the flush-free CTP plate is our prepress green strategy. An important part of it.
Precautions for using no-rinse CTP media
The flush-free CTP plate adopts the negative pattern exposure mode. Before the official use, the laser energy must be adjusted and tested on the original CTP device to find the exposure curve suitable for the flush-free CTP plate, and the parameters for the no-rinse CTP plate are completed. Settings.
There is a difference between the operation mode of the flush-free CTP plate and the ordinary CTP plate. After the flush-free CTP plate is finished, it needs to be fully wetted by the dampening solution (about 10 turns of the water roller). After the pressure is pressed, the adhesive tape in the non-inking zone is taken away by the plate paper, and the "development" is finally completed.
It is this simple process that subverts the traditional process of printing, eliminating the various wastes generated by the traditional plate making process, such as developer, stenciling water and various polluting gases generated by chemical reactions during the plate making process. Thereby achieving the purpose of environmental protection.
There is a difference between the flush-free CTP plate and the ordinary CTP plate, so the precautions in the use process are different. According to our company's experience, we must pay special attention to the following aspects.
1. Exposure time
Try not to expose the CTP plate for free for long periods of time in daylight. If the exposure is unavoidable, the exposure time in daylight can not exceed 1 hour for plates that have been finished. Therefore, it is best to use the instant production method when making plates, that is, arrange the flush-free CTP plates for about half an hour before the machine.
2. Storage
After using it for a while, our company summarized some storage methods for the flush-free CTP plates. One is to make a special wooden box for flushing CTP plates, apply non-reflective paint inside the wooden box, and cover the built-in cover to protect from light. The second is to simply modify the carton that originally stored the CTP plate: add opaque double-layer black paper (in the original carton) at the opening of the carton. Both methods can save the flush-free CTP plates that have not been put on the machine in time for 2 to 3 days.
3. Loading version
In the process of flush-free CTP plate printing and machine-mounted version, try to avoid grabbing by hand, because it is easy to make the fingerprint on the surface of the printing plate, so it is best to wear gloves when handling.
4. Change edition
When the long version is printed, there is a significant shortage of the flush-free CTP plate if the dot loss or the paste is required to be changed during the development process. Because it is developed by the fountain solution and the ink roller of the printing machine, the plate changing is likely to cause a large area of ​​the non-inking area to be dirty (the ink roller contains ink), which is difficult to handle and causes some loss and inconvenient. So pay special attention.
5. Operating habits
Ordinary CTP plates can be directly loaded after development, stenciling and gluing. However, the flush-free CTP plate needs to be dampened with water roller, that is, the water roller is used first, and the plate is dampened for 2 to 3 minutes (the dampening time will affect the removal rate of the excess glue layer, and the best data should be explored through the machine) Then, the emulsified adhesive layer is transferred onto the overprint paper by the inking roller to complete the development. This mode of operation changes the original operating habits of the printing operators. This transitional stage often encounters certain difficulties, but we can enhance employees' awareness of environmental protection and their long-term survival and development through daily publicity and training. Employees consciously abide by the relevant requirements of green printing during the printing process, reduce the operational difficulty of new processes and new operating technologies, and shorten the running-in period in actual production by simplifying, improving and perfecting the operating procedures.
Correct understanding of the shortage of flush-free CTP plates
For the time being, after the no-flush CTP plate is made into a flush-free CTP plate, there are still some shortcomings compared with the ordinary CTP plate, as shown in the following table. But in the long run, it is the future development trend and direction. Moreover, the shortcomings of its existence can be improved through some measures. Here, the author talks about his own ideas in the following aspects.
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