Due to the many advantages of alcohol-free fountain solution, many printing companies are now using or trying to use alcohol-free printing. The pros and cons are like two sides of the twin flower, and there are naturally some problems that need to be solved. What problems usually occur with the use of alcohol-free fountain solution, and how to solve these problems are all we will talk about below.
Metering roller absorbs ink
Alcohol-free fountain solution can make the metering roller sensitive to ink. The ink first adheres to the chrome ravioli and then passes to the metering roller.
Solution: Contact the printer manufacturer or use a specially formulated mixture to corrode the roller.
Ridge watermark
Using alcohol-free fountain solution, if the hardness of the metering roller is (25-30) Shore, ridged watermarks may appear, which affects the printing quality.
The solution: use softer measuring ravioli. It has also been suggested that metering rollers with long fiber surfaces are more hydrophilic. It is very important to maintain the correct concentration to determine the correct fountain solution concentration, especially during the initial preparation, so the use of unfermented fountain solution needs to be replaced at least once a week. To make the fountain solution too cool Cooling is very important when increasing the printer speed, but the operator sometimes makes the fountain solution too cool. This will increase the viscosity of the ink and cause problems such as paper roughening and ink stacking. The right temperature is also important.
Organic growth
If organic matter grows in the fountain solution circulation system, then the circulation system should be cleaned at least once a week, including the drain bucket. It can be rinsed with ordinary water; the mold eliminator is also used to prevent the growth of organic matter; it can also be used to rinse the circulation system with an aqueous solution containing (1-5%) bleach at the end of the working week, but before refilling the fountain solution , To ensure that the circulation system has been cleaned, and no detergent will remain.
Ink roller deinking
Using different alcohol-free fountain solution without thoroughly cleaning the circulation system may cause ink roller deinking.
Solution: You can apply the copper plating method to the old printing press equipped with steel ink rollers.
Blistering
When the fountain solution foams, the accumulated foam will move to the edge of the metering roller and splash onto the paper; the foam will also hinder the flow of water to the rotating bucket roller.
Solution: When using alcohol-free fountain solution, a small amount of defoamer can be used, but it should be noted that the use of catalytic accelerator dryers should avoid the use of silicone resin defoamers.
Paste version
If the amount of alcohol substitute is too small, the dampening is sufficient, and sometimes the fine parts of the CTP version or the PS version will paste. But some other problems can also lead to the phenomenon of pasting.
Sedimentation on the metering roller
Sometimes, alkali formation occurs on the metering roller. The solution to this problem is to move the metering roller away from the chrome roller, clean it with a suitable cleaning fluid and reduce its sensation. Paper fluff caused by thin ink layer.
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