Control these factors, ink stability is not a thing!
Time:2022-12-26
Views:1574
Temperature
Keeping the temperature and humidity constant is very important to ensure the stability of ink color.
In summer printing, due to the high ambient temperature, it is easier for the roller of the printing press to transfer ink. Moreover, with the increase of printing time, the fluidity of ink will be enhanced. Under the condition of the same amount of ink, the ink color of the printing product will be deepened. Make the printing and signature color uniform.
In winter, because the overall ambient temperature is low, when the machine is started in the morning, the temperature of each part is low. The printing operator must do the following two points to start printing.
First, improve the temperature and humidity of the workshop to reach the standard (temperature is 20 ~ 24℃, humidity is 60% ~ 70%).
Second, heating ink or add additives in ink or ink oil, to increase the fluidity of ink, and then turn on. This is because even if the ambient temperature and humidity are just up to the standard, the temperature of each roll of the printing press is still at a low level, which will also lead to the weakening of ink transfer performance, so that the printing press cannot ink well, printing speed is very slow, and the stability of ink color is difficult to control. Need to increase the amount of ink to the usual printing of the same live parts of twice, in order to barely let printing ink look saturated; Or the whole page goes gray; Or when printing thinner paper, the paper is easy to stick to the blanket, causing the blanket to be crushed.
Moistening solution concentration
Today, many printing presses have adopted automatic moistening system, which eliminates the need for operators to adjust the concentration of moistening fluid, here, only the need to manually add moistening fluid press described."
This printer requires the operator to deploy a good version of the liquid before the boot, this is because the printing process to add water and alcohol in the water tank and the original version of the liquid in the water temperature and concentration are different, easy to cause printing with dirty, and if you want to eliminate dirty floating need to increase the water, the ink will become shallow because of the increase of water, which has little impact on the general live parts, But for high-speed operation and high quality live parts are affected, prone to failure.
This printer requires the operator to deploy a good version of the liquid before the boot, this is because the printing process to add water and alcohol in the water tank and the original version of the liquid in the water temperature and concentration are different, easy to cause printing with dirty, and if you want to eliminate dirty floating need to increase the water, the ink will become shallow because of the increase of water, which has little impact on the general live parts, But for high-speed operation and high quality live parts are affected, prone to failure.
In addition, the concentration of the liquid must meet the printing requirements, this can be measured by pH test paper or concentration meter. If the concentration is too large, the ink color in any case can not meet the requirements, and ink will soon emulsify; If the concentration is too small, the floating dirt of the living parts will be eliminated when the water is added to a large amount, but once the printing is accelerated, the floating dirt will easily appear in the mouth position, and the ink will become lighter when the water is increased, forming a vicious circle, making the stability of the ink cannot be controlled at all. When printing after running empty or stopping, the ink color will change greatly, and it is easy to cause sticky dirt.
Therefore, the operator should measure the concentration of the liquid every 2 hours, and add trace alcohol according to the need, because the alcohol is volatile in the printing process, and the printing plate and rubber blanket will cause the alcohol volatilization in the process of pressing and rotating. For a long time, do not add alcohol, do not measure the concentration of the version of the liquid, six or seven hours after the version of the liquid concentration will be very low, resulting in dirty version, emulsification and other failures, resulting in ink stability can not be controlled. This is easy to overlook.
Printing speed
This point is throughout the stability of ink color, because the color can only remain stable if the paper is kept stable. If the paper is not smooth, improper adjustment, empty and stuffy car, it will not only cause ink instability, but also waste a lot of paper, in the encounter of electrostatic large offset paper (generally 100g/m2 paper), prone to non-regulatory empty and paper not smooth phenomenon, Then we should think of ways to increase the air humidity, in Feida walk paper above the placement of metal rod to eliminate static electricity to eliminate paper static electricity.
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Anna Zhang