I may re-recognize the alcohol-free fountain solution

Alcohol-free dampening solution does have advantages in actual use, and it is worth promoting. However, in the specific use process, it is necessary to understand the corresponding use methods and precautions, otherwise it will not only play an advantage, but may even bring trouble. Here are a few things that printing business executives and operators must be aware of before using alcohol-free fountain solutions.

The attitude of the leadership is very important

The green printing road will go sooner or later, and the standard of green printing will only get higher and higher, and it will not be as good as it is now. This can accumulate experience and go ahead. This must be recognized by the printing industry leadership.

In addition, in the process of promoting the use of alcohol-free fountain solution, the attitude of the leadership is also very important, because when the alcohol-free fountain solution is first used, the operator is not suitable for the process conversion, more or less will encounter When it comes to the problem, there will always be some complaints. If the leadership retreats, then it will end in failure. Therefore, it is necessary to reiterate: the entire process of alcohol removal, the active participation of the printing captain and the operators is very important, and sometimes even the key to success or failure. The printing enterprise leadership should let everyone fully understand the meaning of process conversion and mobilize everyone to use alcohol-free. The enthusiasm of dampening solution.

Alcohol-free fountain solution has certain requirements for offset printing machine

In the process of transferring the alcohol-free fountain solution in the water system of the offset printing machine, there are certain requirements for the stability of the waterway and the surface condition of the rubber roller. This is because the viscosity of the alcohol-free fountain solution has no high viscosity of the alcohol fountain solution. Therefore, the water film transmitted on the rubber roller is relatively thin. When the pressure between the rubber rollers is uneven, the surface of the rubber roller is broken, or the concentricity of the rubber roller is insufficient, the transmission of the alcohol-free fountain solution may be insufficient or partially insufficient. Therefore, it is not suitable for alcohol-free fountain solutions for offset presses that have been used for many years and lack maintenance.

Adjust and clean the offset press before using alcohol-free fountain solution

For offset presses that can use alcohol-free fountain solutions, the following issues must be observed before use.

(1) Check and adjust the offset press. The first step is to check the hardware of the offset press. The focus should be on the water system of the offset press to ensure that it does not rise and fall down, and that the pressure between the rollers is unstable under short-term continuous pressure. And pay attention to the hardness of the rubber. Generally, the softer the rubber, the better the water performance. The ideal rubber hardness of the water system is 25-28HS.

Secondly, the water system of the offset press is re-adjusted so that the water supply of the water roller is appropriate, that is, the ink on the surface of each set of plates is re-adjusted to equilibrium.

Finally, according to the printing sample, the relevant parameters of the printing machine are set. Generally, the "pre-wet" parameters of the offset printing machine are adjusted to ensure that the alcohol-free dampening solution can still be printed without being dirty. Small printing loss.

(2) Clean the wetting circulation system. The cleaning described here is not as simple as cleaning the wetting cycle with clean water. Under normal circumstances, it is only necessary to carry out simple cleaning before using alcohol dampening solution. However, before using alcohol-free dampening solution, it is necessary to use a special cleaning agent to completely remove the ink and calcium in the circulating pipe. Alcohol dampening solution contains more surfactants, which has stronger cleaning ability than alcohol dampening solution. If the circulating pipe is not cleaned thoroughly, the alcohol-free dampening solution will clean a lot of pipe impurities during the printing process. The quality of the alcohol-free dampening solution is deteriorated, and printing failure occurs.

Possible problems with alcohol-free fountain solutions

(1) The total feeling needs to use a large amount of water supply to achieve ink and water balance. Many operators have found that the use of alcohol-free fountain solutions requires a significant increase in water supply to achieve ink-and-wash balance. This is actually a matter of operation. There are two ways for a modern offset press to adjust the water supply to the plate. One is to adjust the speed of the water roller, and the other is to adjust the pressure between the water roller and the printing plate. Since the alcohol dampening solution has a higher viscosity than the alcohol-free dampening solution, the amount of water delivered to the printing plate by the alcohol dampening solution system is transferred to the printing plate at the same time and the water roller speed. The amount of water is large, and after the use of the alcohol-free fountain solution, in order to prevent the printing plate from being dry, some printing operators can realize the speed of the water fountain roller, so that the feeling is that the water supply is increased.

(2) When the first use is used, it is easy to cause excessive emulsification of the ink, dirty surface of the plate, and dry plate. Once the above situation occurs, two tasks must be done: one is to cut off the connection between the water delivery system and the inking system in time to prevent water and ink from emulsification on the surface of the printing plate; the second is to re-adjust the amount of water and the amount of ink. Regain the ink balance.

(3) The amount of dampening solution added is determined by measuring the pH of the dampening solution, and the results are often inaccurate. The stock solution of the alcohol-free dampening solution is a highly concentrated substance, and is generally used in a dilution ratio of 1:50. During the specific use, some of the stock solution may be lost in the water tank, and the concentration of the alcohol-free fountain solution may be slightly changed. In this case, a little stock solution needs to be added. At this time, if the pH of the dampening solution is adjusted, the purpose is difficult to achieve, because the stock solution of the alcohol-free dampening solution itself is also a buffer. Experiments have shown that when the concentration of the alcohol-free dampening solution is diluted between 2% and 5%, the pH value does not change significantly, so the correct method is to determine the amount of dampening solution added by measuring the conductivity of the dampening solution.

Considering the difficulty and complexity of using alcohol-free fountain solution, many printing companies will gradually realize “alcohol-free” by using “alcohol reduction”. This is a good idea and in fact it has been very good. effect. In short, whether it is a printing enterprise manager or a printing machine operator, only by fully grasping the characteristics and usage methods of the alcohol-free dampening solution can the role of this new thing be truly realized, and the goal of green printing can be realized at an early date.

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