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On the first working day after the Spring Festival holiday, the outdoor cold weather is steep. After turning on the air conditioner, the room temperature of the printing shop gradually increased from 10 ° C to 16 ° C. We started the printing job, but we found that something was wrong shortly after the 7-day color press was run: although the ink layer on the ink roller was thick, the ink on the plate was always insufficient. At first, we suspected that the ink emulsification caused the problem, but the ink on the four units of the printing press was not normal, and that many of the printing machines had such symptoms at the same time. The inks used were all newly opened inks. Therefore, the doubt of ink emulsification is ruled out. Later, we suspected that there was a problem with the printing plate, so we re-created a set, but the problem was still the same.
Later, after the room temperature rose back to above 18 °C, after nearly one day of constant temperature and warmth, the temperature of the printing body gradually rose. At this time, the temperature of the printing plate attached to the metal drum of the machine also rose to the required temperature, and soon the plate was printed. The oleophilic performance was restored, and a large amount of ink attached to the ink roller was transferred to the printing plate, and the problem naturally disappeared.
Careful analysis of the cause of the failure, the temperature during the Spring Festival holiday is low, the printing machine is stopped for a long time and the heating of the workshop is stopped, so that the temperature of the printing body gradually decreases with the temperature of the workshop, which is close to the room temperature of 10 °C. After work, the room temperature slowly rises. When the indoor temperature of the workshop just rises to 16 °C or higher, the metal body of the equipment is still heating at a very slow speed. To raise the temperature of the metal body of more than ten tons to the workshop. The room temperature is close, and it is difficult to complete without a day. The printing plate below 16 ° C has a low affinity for the ink. Although the ink supply is large, most of the ink is repelled by the printing plate and adheres to the ink roller. The ink on the printing plate is less, resulting in a marked shortage of ink color. .
After experiencing this failure, we realized the importance of maintaining the stability of the workshop environment and made specific arrangements for maintaining the temperature and humidity of the workshop during the long vacation. For example, the winter holiday will warm the workshop every two days, and the heating must be warmed up one day before going to work to keep the working temperature of the equipment body, so that it can start working smoothly when going to work. The ink to be used is also taken out of the low temperature warehouse a few days in advance and placed in a constant temperature workshop. Otherwise, the ink is cold at the machine, and due to its high viscosity, it will affect its normal transmission. Even if it is urgently needed, the low-temperature ink should be boiled with boiling water. After the temperature of the ink rises and the viscosity is lowered, it can be used on the machine. Due to the high air humidity during the spring and summer seasons, the air conditioner and the dehumidifier should be kept on during the holiday, so as to avoid electrical failure or shorten the life of the electrical components. We have been doing this during the long vacation for many years, greatly reducing the printing failure rate. (Editor: Liu Yidong)
The above content is selected from the second issue of “ Printing Technology·Digital Printing Art †of Keyin Media . For more content, please pay attention to the channel. The latest journal content clicks into the electronic journal channel of Keyin Printing Technology .
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