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Using alcohol substitutes, alcohol-free printing ink easier to achieve balance, not alcohol diluted with a specific thickness of the ink film to complete the printing, networks can be less precise, and Emulsion higher quality print ... ... HC printing network A large printing company in Shenzhen, conduct research and saw no alcohol in the implementation of the enterprise printing, has achieved very good results. Use alcohol-free printing can not only reduce printing costs, more environmental protection, can reduce alcohol volatile series of environmental problems caused, so this compilation of the alcohol-free printing of the article, to enable us to better understanding and application of non- alcohol printing. Using alcohol substitutes, alcohol-free printing ink easier to achieve balance, not alcohol diluted with a specific thickness of the ink film to complete the printing, networks can be less precise, and Emulsion higher quality print. 1. Alcohol substitutes Alcohol substitutes different in several key performance IPA (isopropyl alcohol), including its viscosity, surface tension, pH, Fountain Solution Conductivity. No alcohol products can not be freely used on different presses, which print operators need to close the exchange, to seek the best suppliers Fountain Solution Formula. In fact, there are several alternatives to alcohol can be used. They are from the from the glycol and glycol ethers to extract the chemical family of one or more of chemical composition, but also adding some other additives like IPA. , And try to completely replace all of these formulations fountain solution in the IPA, also provide some unique properties. More importantly, our use of alcohol substitutes concentrations were far lower than the IPA concentration in the same printing conditions, substitute a small amount of alcohol can achieve IPA fountain solution containing 10 to 20 times the effect. 2. Fountain solution viscosity The IPA to the fountain solution will significantly increase its viscosity, but many alcohol substitutes, little or not impact on viscosity. Because the viscosity reduction of alcohol substitutes, less fountain solution or by extrusion in continuous contact measurement fountain roller measured by measuring the roll, so we must increase the fountain roller speed, led many to conclude that the printing operator error in use of alcohol fountain solution alternatives must be used when printing more water. In fact, to some extent increase the viscosity of the solution is to make the fountain solution cooling. 3. Surface Tension Rapid formation of thin wetting water film plates and the ability to Offset printing Fountain solution on the two key demands, mainly by the surface tension of fountain solution decision. People generally believe that the low surface tension of fountain solution can be well used in high-speed printing, but in Europe there are reports to the contrary. It is understood that the current alternatives to alcohol can achieve printing operators are accustomed to IPA The low surface tension. Surface tension of pure water 72 × 10 -3 N / m, in the fountain solution, the alcohol concentration of 10% to 25%, reduce surface tension to a level (35 ~ 45) × 10 -3 N / m, can make fountain solution quickly to form a continuous film covering the entire plate. Alcohol fountain solution without the use of surfactants and solvents to reduce the surface tension. Surfactants or surface active additives are organic chemicals, because of its polar molecular structure, they tend to concentrate at the interface. Under normal circumstances, they fountain solution and ink and air to air between the interface. In the high-speed printing, these interfaces change rapidly, so the surface active agent to be dispersed quickly to re-add the new interface. Fountain solution in a large number of surfactants in the printing process is very important, but adding too many will increase ink emulsification. 4. Print brightness and gloss Alcohol is an active invasion of ink thinner, which allows ink to lose luster, and affect the color, the color is acceptable to require a thicker coating on the impression cylinder of the ink film. When used in proper concentration, alcohol substitutes no dilution of the ink, the color was acceptable only a small amount of ink and water, this network will be more precise, dot gain trend is also decreased. 5. Conductivity and pH values In printing, electrical conductivity and pH value of maintaining consistency, stability is very important. Before the printing, fountain solution should measure electrical conductivity. Any impurities may lead to abnormal electrical conductivity, and you should re-test the water conductivity. In the printing process, ink and paper may be contaminated fountain solution, the conductivity increase is normal. Can be measured simultaneously measuring electrical conductivity of pH. Acid fountain solution of pH value should normally be between 4.0 and 5.0. For high quality printing, it is important to maintain the fountain solution used in the best of the pH value. All acidic fountain solution has a buffer to some extent, if the concentration increases, conductivity will continue to increase straight-line speed, while the pH values begin to decline, and then leveling off. Therefore, the conductivity of the decision more than the pH value of the concentration of fountain solution. If the pH value high (above 5.5), may play a dirty plate, in order to maintain a clean plate, an additional amount of water, which may cause serious ink emulsification. If the pH value is too low (below 3.5), plates may blur, ink emulsification occurs, roller stripping, ink drying time extended. I am an expert from vacuum-steam-cleaner.com, while we provides the quality product, such as Plastic Molds Casting , Best Steam Vacuum Cleaners Manufacturer, Vacuum Steam Cleaners,and more.
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