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The three most important factors in printing are those that printers must understand: choosing printers; using printers correctly; and implementing correct printer maintenance procedures.
The non-graphic part or the blank part is hydrophilic under the effect of a very small layer of colloid. The role played by the fountain solution is to continuously replenish the gel layer in the blank part of the plate when the printer is in normal operation. However, when the layout is overly watery, many printing plate failures occur. Excessive moisture in the ink can cause variations in the viscosity and fluidity of the ink, resulting in ink emulsification. Too much moisture in the paper will cause more paper powder to be produced and accumulate on the blanket, which will degrade the printing quality. It will also cause small changes in the paper size, making the overprinting of the multi-color printing machine in the actual operation. The rate dropped.
Therefore, a good fountain solution contains a chemical called wetting agent to reduce the amount of water on the plate, so that the water spreads on the plate into a thin film of water. The fountain solution also needs to contain strong preservatives to prevent the bacteria from swallowing to protect the plate's colloids, resulting in deterioration of the fountain solution. The buffer in the fountain solution helps to maintain a stable pH, allowing the colloid to adhere to the plate better under acidic conditions. In addition, because the fountain liquid is continuously agitated by the mechanical circulation pump and the filter, it is necessary to take measures to control the generation of foam in the wetting system.
Speedmaster multi-FS12 fountain solution has all of the above features. It contains effective preservatives that can be decomposed and defoamers that perform well. The synthetic colloid in FS12 was specially developed to protect the blank part of the printing plate. Powerful buffers automatically control the pH in large dilutions. Advanced wetting agents allow printers to reduce the water film on the plate while still maintaining a precise ink balance.
Speedmaster recommends using conductivity to control the amount of fountain solution. Too little usage will prevent the printer from experiencing all the advantages of high quality products. However, excessive use of the fountain solution may result in uneconomical use of the fountain solution.
To maintain the best quality efficiency and condition of the printer, it is necessary to have a daily maintenance program. The maintenance includes the maintenance of the printing machine parts; the ink roller blanket does not have any crystallization from the mirror; the surface does not have the resin in the ink; there is no colloidal salt substance in the fountain solution; there is no paper powder, paper hair and dusting.
Some inexpensive solvents, such as gasoline, kerosene, etc., although they can remove the ink, these solvents have a great deal of damage to the rubber surface. The operator will not find this damage immediately, but eventually the quality of the printing will deteriorate. In the short term, the blankets and rollers will need to be continuously replaced, and the cost will not be effectively controlled.
To remove all deposits, including paper powder, paper dust, dusting, colloids and salts, one of the most important cleaning agents is water. Because the solvent cannot remove the above deposits, these deposits form chemical crystallization after a long period of deposition.
Therefore, for effective cleaning, water and solvents must be mixed in the cleaning process. Speedmaster WH11 and WH12 are cleaning pens that are easy to mix with water slicks. They don't contain water, but they contain special chemicals. After adding water, they form emulsions. This is the ideal mixture to remove all the ink roller and blanket deposition at the same time. The cleaned surface is a matt, non-tacky, ideal transfer surface. Just like the new rubber, WH "and WH1" in the detergent composition is carefully selected, will not damage the rubber surface, will not shorten the life of the rubber as cheap solvent.
According to the printers who used the Speedmaster multi-washer and used the maintenance program correctly, they can increase the quality of the plant by at least 500. At the same time, it was found that when the color is changed, "40% of the paper can be reduced, which saves 70% of the time.
Speedmaster's WH or WH1 detergents are best when used in a mixture of “5% water. Water is the cheapest compound to use on the press, so adding water is more economical and safer.
Lithographic offset printing is a chemical process. It does not simply transfer ink from high-text areas. Instead, the non-graphical areas are not covered with ink with the help of fountain solution, even if printing exceeds 70,000 impressions per hour. The next is no exception. However, what sounds astonishing is that 75% of printing failures in printing are caused by chemical factors and only 25% are mechanical.