Temperature control of the hottest offset press an

2022-10-19
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Temperature control of offset press and its influence on printing quality

temperature control of offset press and its influence on printing quality

temperature of inking device

most of the transmission power of a printer is used to drive the inking device. On the ink conveying device, when the ink is separated, the mechanical energy becomes heat when the elastic rubber roller is rolled and the ink string roller moves back and forth. Therefore, people try to use circulating water to keep the inking roller and ink bucket roller constant temperature, and try to discharge this heat from the source. This circulating water is in the central water tank, and part of it is also adjusted to the required temperature in the lower unit attached to the printing unit. It is better to adopt full constant temperature (cooling and heating) so that the ink conveying device can reach the standard working temperature before starting printing

so far, there are three schemes for adjusting the temperature of the ink conveying device, which are compared in this paper. These three ways maintain their advantages, which are different because the temperature as the adjustment amount is measured in different places:

1) the adjustment amount is the surface temperature of each ink conveying device

2) the regulating amount is the water temperature for the constant temperature of the ink roller injected into each ink conveying device

3) the regulating quantity is the water temperature in the central water tank of the thermostatic equipment

oil cooling

although the thermal power generated on the transmission mechanism and bearing on the transmission side of the offset press is relatively small, it is unlikely to be discharged, so it will cause the side parts to heat up. A high temperature of about 60~c can be felt where high-quality products have no transmission side components protected by shields, which has an adverse impact on the temperature uniformity of the whole machine surface. The function of oil cooling is to ensure that the temperature of the side parts is not higher than the hand temperature

fountain solution cooling

the so-called water film or alcohol wetting device, as a glass fiber supplier, usually uses the cooled fountain solution to supply water, and its temperature is about 10 ℃. On the whole, the cooling of fountain solution has little effect on the heat dissipation of offset press. However, keeping the low temperature of the fountain solution is conducive to reducing the evaporation of alcohol in the mixing tank and the water conveyance device, and can improve the viscosity of the fountain solution

constant temperature of plate cylinder

waterless offset printing lacks the cooling effect of fountain solution. For the waterless offset press without constant temperature of ink conveying device, it is best to cool the plate cylinder by blowing air. The offset printing with water only needs the constant temperature of the inking device. The constant temperature of the printing plate cylinder is not included in the experiment introduced in this paper

infrared (old) temperature sensor

all heating body surfaces will emit infrared rays, which can be measured by a sensitive radiation detector and used as a temperature display. For absolute measurement, it is necessary to calibrate or accurately understand the emission capacity of the relevant surface. In this paper, the infrared temperature sensor is used to measure the temperature on the inking device, surface measuring machine and blanket, so as to provide the adjustment amount for constant temperature (adjustment method 1)

fluctuations in printing

three adjustment methods can be used to judge the increase of field density and step value with the help of printing sheets, which are extracted from more than 175000 sheets in mass printing. The printing plates are almost the same. Mainly in the global economic downturn, it is to determine the standard deviation of statistics and the range of differences between the maximum and minimum values

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