Monitoring and maintenance of UV curing system
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It is well known that UV inks have high abrasion and scratch resistance properties after curing, and the properties mentioned herein mainly depend on the curing treatment of the ink by the UV curing system. Through the analysis and research of UV curing system, this paper will explain some real-time monitoring and equipment maintenance and maintenance methods in the curing process, which will have a lot of guiding value for the curing system to complete the curing process more accurately and efficiently.
1. Real-time monitoring of the curing system
Real-time monitoring of the UV curing system is the tracking and uninterrupted measurement of the UV curing system. The curing effect depends mainly on the energy output from the curing equipment, and the best way to test the output energy of the curing equipment is to use a radiation detector to measure it. A radiograph is a portable device designed to measure the intensity of light in a spectrum. The results of the measurement are displayed in digital form in the window of the device. The unit of the number is microjoule (Joule is a measure of energy, which is expressed The energy acting on a unit area per unit time, 1 jog = 1000 microjoules).
There are many types of radio detectors available for the operator of the probe. The basic principle of a radiation detector is to pass its rays through a dry layer, which in turn displays the data detected by the detection sensor on the detector. More advanced radio detectors can detect more data information such as light intensity, power density and temperature of the light source. In addition, the detection operator can also connect the radiation detector to a printer or microcomputer so that a map of the information between the probes can be depicted.
These more advanced detectors can plot the effect of the curing effect over time under the UV light source at this temperature. With this pattern, it is possible to detect the position of the light source and the presence of distortion of the light tube, and also to test the light emitted by the light source. Whether it is parallel light and analysis of whether the heat transmitted by the scattered light is uniform during irradiation. Although there are many different types of ray detectors, they all follow the same rules, so they are used in the same way as the operating procedures. The operations mainly include the following:
① For the configuration and installation of the basic components of the curing system, first clean the reflector of the UV curing device and install a new lamp for the device. This is the basis for ensuring the entire cure test operation (Note: Preheat the UV lamp for at least 15 minutes before testing).
② Standardize the UV curing system, mainly including determining the number of UV lamps, determining the output power of the UV lamps and setting the conveyor speed of the conveyor belt. Although the initialization settings for these parameters are completed, the actual production is completed. Always check during the process to determine if they meet the production requirements.
③ Test and record the test content and results. Record the contents of the test, mainly including the abnormal phenomena of the machine during the test, equipment deviation, etc., when recording, also record the date of the test, the location of the test and other objective conditions during the test.
④ When measuring with a radiograph that only provides digital information, the test should be performed in two parts, namely, testing when all the light sources are working and separately testing each light source. When the effective curing width of the UV system is narrowed, this method can be used to accurately pick out the problematic UV light source from a complex system.
⑤ Periodically test the UV curing system during production. The production of the device at this time can be judged by testing the effective curing width of the complex system. For the convenience of comparison, the time and position of the test should be recorded during the test.
2. Maintenance of the curing system
Maintenance means regular inspection of the UV curing system, cleaning of the UV curing equipment, repair and replacement of parts in the production that are not able to meet production requirements due to wear.
Regular maintenance work should include the following aspects:
① Detect and clean the surface of the reflector.
② Check and clean the lamp.
③ Grab the lamp on the clamp seat by hand and gently swing it a few times to check whether the lamp is in a free state. This can ensure enough clearance to meet the deformation caused by the thermal expansion of the lamp and avoid the tube bursting. The phenomenon occurs.
④ Under the premise of ensuring the above lamp gap, ensure that the connection between the various components of the equipment is tight.
⑤ If the UV curing system uses an air-cooling system, ensure that the fan is in normal working condition, and all ventilation pipes must be cleaned without any obstacles. If the UV curing system uses a water cooling system, the water level in the water tank must be ensured and the refrigeration equipment should be in normal working condition.
⑥ Make sure that all safety measures are in place to ensure that the linkages such as the conveyor belt are working properly.
The surface of the reflector should be cleaned frequently and kept clean. Although the solvent in the UV ink is less, it is a non-volatile ink, but there is still a loss of chemical composition in the UV ink during the curing process. These volatilized chemicals are on the surface of the reflector. It has corrosive effect and also has corrosive effect on the lamp. If white faint dots are found when cleaning the reflector or tube, their surface has been corroded. These corrosions can cause the reflection of the reflector to decrease, and also affect the amount of light emitted by the tube. In addition, the surface of the reflector is thin, and it will be seriously worn after working for a long time, so it should be replaced regularly.
In the process of cleaning the lamp tube, it is necessary to carefully check whether there are any bubbles on the glass surface of the lamp tube and whether there are cracks on the electrodes at both ends, and then it can be used to judge whether the lamp tube is intact. In the process of checking the lamp tube, also gently turn the lamp tube to ensure sufficient clearance for thermal expansion to avoid the expansion and rupture of the lamp tube and excessive deformation. If the tube bends to a certain extent, the center of the tube The relative position of the line to the center of the arc of the reflector changes, which changes the focus of the curing source and affects the flatness of the UV curing effect.
Since each component has heat generated during the production process, thermal expansion and contraction occur, so it is particularly important to ensure the safety of the circuit connection socket and other parts. In the curing process, insufficient cooling will also cause the temperature of the reflector, the electrical components inside the light box, the shutter and the lamp to be too high. Therefore, it is necessary to ensure that the cooling system works normally during the curing process.
In order to ensure safe production, all safety facilities should be perfected. The production of lack of safety measures will put the life of the workers at risk. Therefore, the safety facilities of the curing system should be inspected regularly.
3. Summary
Even though it is widely believed in the printing industry that the printing industry has entered the stage of meager profit, it is not difficult to imagine the huge profits brought by standardized production operation and production management. The discussion in this paper is part of the standardized production management of printing enterprises. At the same time, it can also provide guidance for enterprises to save resources and create profits.