· Inking device temperature Most of the drive power of a printing press is used to drive inking units. In the inking device, when the ink is separated, the mechanical energy becomes heat when the elastic rubber roller is pressed and the ink roller is reciprocated. Therefore, people try to make the tandem roller and the ink fountain roller constant temperature with circulating water, and try to discharge this heat from the place of origin. This circulating water is in the central water tank and is also partially adjusted to the required temperature in the lower unit attached to the printing unit. It is preferable to use a full thermostat (cooling and heating) so that the inking unit can reach the standard operating temperature before starting the printing. Up to now, three schemes have been implemented for adjusting the temperature of the inking device, which are compared in this article. These three schemes are distinguished by measuring the temperature as a conditioning variable at different locations: 1) The adjustment amount is the surface temperature of each inking device. 2) The adjustment amount is the temperature of the water used for the constant temperature of the ink roller injected into each inking device. 3) The adjustment volume is the temperature of the water in the central tank of the thermostat. ·oil cooling Although the thermal power generated on the drive mechanism and bearings of the offset press is relatively small, it is unlikely to be discharged, which will cause the side parts to heat up. A high temperature of about 60-C can be felt in areas where there is no shield-protected drive-side component, which has a negative effect on the temperature uniformity of the entire machine face width. The role of oil cooling is to keep the side part temperature no higher than the hand temperature. · Fountain solution cooling So-called water film or alcohol wetting devices are usually supplied with a cooling dampening solution, the temperature of which is approximately 10°C. On the whole, fountain solution cooling does not have a significant effect on the heat dissipation of the offset press. However, maintaining the low temperature of the fountain solution helps to reduce the evaporation of alcohol in the mixing tank and the water transfer device, and can increase the viscosity of the fountain solution. · Plate cylinder thermostat Waterless offset printing lacks the cooling effect of fountain solution. For waterless offset presses that do not have a constant inking device, it is best to cool the plate cylinder by blowing air. Offset printing with water requires only a constant temperature of the inking unit. The plate temperature is not included in the experiments described in this article. Infrared (old) temperature sensor All surfaces of the heating body emit infrared rays, which can be measured with a sensitive radiation detector and displayed as a temperature. For absolute measurements, calibration or exact understanding of the surface's launch capability is required. Infrared temperature sensors are used in this article to measure the temperature of the inking device, surface measuring device, and blanket to provide a constant amount of adjustment (Regulation Method 1). ·Fluctuations in printing The increase in density and gradation in the field can be determined by means of three sheets of adjustment with the help of printed sheets, which were extracted from more than 175,000 sheets in large-volume printing. Plates are almost the same. It is mainly to determine the standard deviation of statistics and the range of difference between the maximum and minimum values.