Analysis of temperature control points of the hott

2022-07-31
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Analysis on the key points of temperature control of offset press

· temperature of inking device

most of the transmission power of a printer is used to drive the inking device. On the inking device, when the ink is separated, the mechanical energy becomes heat when the elastic rubber roller is rolled and the ink roller moves back and forth. Therefore, people try to use circulating water to keep the ink 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 adjusted to the required temperature in the lower unit attached to the printing unit. It is better to use full constant temperature (cooling and heating) so that the inking device can reach the standard operating temperature before printing

up to now, there are three schemes for adjusting the temperature of the inking device, which are compared in this paper. The three schemes are different because the temperature as the regulating amount is measured at different places:

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

2) the regulating amount is the water temperature for 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 at 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 there are no transmission side components protected by the shield, 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 usually uses cooled fountain solution for water supply, 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 cooling of fountain solution, which is used to turn the hand wheel. For the water-free offset press without the corresponding adjusting tensioner position of the constant temperature of the ink conveying device (it is necessary to remove the lower shroud of the main body and then stop), it is best to cool the plate cylinder by blowing. The offset printing with water only needs the constant temperature of the inking device. The constant temperature of the plate cylinder is not included in the experiment described 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 measurements, calibration or accurate knowledge of the emission capability of the surface concerned is required. 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)

· fluctuation 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 plates are almost the same. It is mainly to determine the statistical standard deviation and the range of difference between the maximum and minimum values

reprinted from: Longjiang printing

development of automotive basic technology that can solve all these problems

conventional electronic universal mainly adopts servo electromechanical as the power source statement:

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