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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 equipment to find out the exposure curve suitable for the flush-free CTP plate, and complete the use of the parameters for the rinse-free CTP plate. Settings.
There are some differences in the operation methods of flush-free CTP plates and common CTP plates. After flushing the CTP plate, the plate must be fully wetted with the dampening solution (the idler roll idles for about 10 laps). After the pressure is applied, the adhesive layer of the non-inked area is taken away and the “development” is completed.
It is this simple process that subverts the traditional process of plate-making and eliminates the various wastes generated in the traditional plate-making process, such as developer, plate-printing water and various pollution gases generated during the plate-making process due to chemical reactions. In order to achieve the purpose of environmental protection.
There is a difference between the flush-free CTP plate and the ordinary CTP plate. Therefore, the precautions during use are also different. According to our company's experience, we should pay special attention to the following aspects.
1. Exposure time
Try not to expel the CTP plate for a long time in sunlight. If exposure is unavoidable, the exposure time in daylight should not exceed 1 hour for plates that have been finished. Therefore, it is best to adopt the real-time production method when making plates, that is, arrange the flush-free printing of the CTP plates about half an hour before the on-line machine.
After a period of use, our company has summarized some methods for storing the rinse-free CTP plates. One is to make a special wooden box for the flush-free CTP plate, and paint the inside of the wooden box with non-reflective paint, and cover the cover to avoid light. The second is to carry out a simple transformation of the carton originally storing the CTP plates: a double layer of black paper that is opaque to the opening of the carton (there is in the original carton). Both methods can save the rinse-free CTP plates for 2 to 3 days after they have failed to be shipped on time.
In the process of flushing the CTP plates and the upper machine-mounted plates without washing them, try to avoid the use of hand-grip, because it is easy to make fingerprints imprinted on the plate surface, so it is best to wear gloves when handling.
4. Change version
When printing a long-lived version, if the dots are missing during the development process or the stencil needs to be changed, there is a significant shortage of the rinsing-free CTP plates. Because it is developed by the fountain solution and the ink roller of the printing press, changing the plate at this time is likely to cause a large area of the non-inking area to be dirty (the ink on the water roller), which is difficult to handle and causes some losses. inconvenient. So pay special attention.
5. Operating habits
Ordinary CTP plates can be directly plated after being developed, processed, and spliced. However, the flush-free CTP plate needs to be dampened by the water roller, that is, first by the upper water roller, and dampened for 2 to 3 minutes (the dampening time will affect the removal rate of the excess glue layer, and the best data must be found through the machine). Then, the ink roller is used to transfer the emulsified adhesive layer onto the offset paper to complete the development. This mode of operation has changed the original operating habits of printing operators. This transitional stage often encounters certain difficulties. However, we can enhance awareness of environmental protection and long-term survival and development of enterprises through daily publicity and training. Employees in the printing process conscientiously abide by the relevant requirements of green printing, through the simplification, improvement and improvement of operating procedures, reduce the difficulty of new processes, new operating techniques, and shorten the actual production in the run-in period.
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