Device failure caused by film reversal The author had encountered such a failure in the production process, gravure printing machine in the printing of a seven-color product, in the printed film after the occasional slight anti-sticking phenomenon. This product is a regular product of the factory and no such phenomenon occurred before. When technicians arrived at the scene, inks, materials, and production processes were repeatedly compared and tested. However, the printed products did not have any problems, and problems occurred when the batch was produced. Therefore, the technician thinks that the printing system's drying system has failed, and this problem has been thrown into the hands of equipment maintenance personnel. After the maintenance personnel arrived at the scene, they checked and tested the printer's oven and its guide rods, heat exchangers and traps, heating control systems and instruments, and electric valves, exhaust fans, and air flow components. The results showed good results. The parameters are in the normal range. The whole system does not see any problems, but anti-sticking still occurs.
Finally, a careful analysis of the anti-sticking property of the film on the rewinder revealed that about 500 meters of products in the print products of about 6000 meters have anti-adhesion, and from the slightly unobservable anti-sticking property to the visible anti-adhesion, The gradual disappearance is a process of gradual development and disappearance. The biggest possibility of this situation is the occasional failure of the temperature control system. Thermocouples and electrovalve control devices have a higher probability of problems. Therefore, thermocouples have been replaced. However, this phenomenon is still happening occasionally. After the controller, after a period of observation, no re-sticking occurred and the problem was solved.
Case Solvent Volatilization White Point Phenomenon The second failure case was when the author used a special gravure printing machine for the production of heat transfer film, where irregular white spots were found on the coating layer. Frequent problems. The operator adjusted the humidity of the printing roller and the drying hot air according to the general processing method, but the white point phenomenon could not be solved. When the technician arrives at the site, the problem may be the amount of coating and the moisture content of the hot air to be dried. Adjusting the coating amount by replacing the plate roller and changing the moisture content of the hot air are repeated several times. The situation has changed, but it cannot fundamentally solve the problem.
Under such circumstances, the technicians judge that there is a problem with the drying system of the equipment and require the equipment department to solve it. After the equipment maintenance personnel arrived at the site, the oven, heat exchanger, steam valve, temperature control system instrument and electric valve, humidifier, fan and air volume were carefully checked, and the equipment parts were in good condition. Normally, the air volume, humidity, and temperature are all within the scope of the control requirements, and the problem of equipment can be basically eliminated.
Finally, through the analysis of the samples, it was found that these white spots occur in all parts of the product, and the problems are universal. Therefore, the problems of materials and coating solutions should be considered. After replacing the materials of different manufacturers, the problem remains. Therefore, the coating liquid supplier was asked to test it. As a result, it was found that the volatilization rate of the solvent in the batch of the coating liquid was significantly higher than that of the original coating liquid, and the production liquid was replaced immediately after the replacement of the coating liquid, and no white spots occurred again.
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