Maintenance of the Technotrans dampening system in Heidelberg
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Lithography is achieved by the principle that ink and ink are incompatible with each other. This principle is very important to imagine the role of dampening solution in the printing process. In the alcohol dampening solution, the dampening solution is composed of alcohol additive and water. The dampening system of Heidelberg printing machine can automatically mix alcohol, additives and water into a dampening solution which can meet the requirements of full printing.
The operating principle of the Heidelberg press dampening system is composed of an alcohol extractor, an additive suction device, an upper water pump, a water tank and a refrigeration system, and an intermediate return water tank. When an external water source enters the Technotrans dampening system, the additive suction device is first injected. The higher flow rate of water flows through the additive hopper so that the internal pressure is lower than the outside air pressure, and the additive is drawn into the tank due to the difference in air pressure.
The principle of alcohol absorption by alcohol picker is basically the same as that of sucking additive. The difference is that the float ball in the alcohol meter measures whether the alcohol content in the dampening solution has reached the set ratio from time to time. If the control device does not reach the control device, the valve is opened and inhaled. Alcohol, this is turned off, the upper pump sends the dampening solution to the heat exchanger in the refrigeration system, and the heat exchanger cools the dampening solution through the upper pipe into the machine dampening solution tank, and the dampening unit is supplied with water. Use the back water system to keep the dampening solution in the water tank at a certain water level for printing. This is how the dampening system works.
During the use of the Heidelberg dampening unit, it is often the case that the additive sucker sometimes does not absorb the additive. According to the analysis, there may be several reasons as follows.
1. The water pressure of the external water source is too low. According to its working principle, the water entering the additive suction device needs to have a certain flow rate, so that negative pressure can be generated to suck the additive into the water tank.
2. The solenoid valve of the water supply is damaged and the float switch is out of order. If the water supply solenoid valve is damaged, the float switch is damaged, the float switch cannot open the solenoid valve, the external water source cannot enter the additive suction device, and the failure of the float switch may cause the solenoid valve to fail to work normally.
3. The problem of possession of additives. This is a major reason. Since the inside of the additive sorbent is composed of smaller pores, if the selected additive is prone to precipitation, these precipitated additives tend to clog the pores inside the sipper, causing the additive to malfunction. When using additives, use liquid additives that are less prone to precipitation and crystallization, and powder additives should not be used.
How to maintain the Heidelberg dampening unit during use! Due to the printing machine's dusting device and printing paper, a large amount of dust is generated. These dusts are easy to get into the dampening unit. Most of the problems related to the dampening unit encountered in production are improper maintenance and improper cleaning. Therefore, special attention should be paid to the following issues in production work:
1. All filters and strainers should be cleaned in time.
2. Cleaning of the cooling system. If the condenser is not cleaned up in time, the heat of Freon (also known as snow) cannot be dissipated, resulting in the cooling system not working properly.
3. The cleaning of the water tank, the sediment caused by the dampening solution should be cleaned in time. If it is not cleaned, the water return pipe and the heat exchanger will be blocked, resulting in the system not working properly.