Відео

rougness .4 Rz for film; .6 Rz for paper. regards

Also solvent you took 35% of total solid ink...how?

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How to calculate solvent consumption?

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Composition of a Fountain solution Fountain solution composition varies for a number of reasons. Most dampening solutions, however, are acidic, with a pH of 4.0-5.5 being typical. The dampening system itself also influences the composition of the dampening solution. For example, some dampening systems require a specific percentage of alcohol (or alcohol substitute) due to the method of applying the solution to the printing plate. Sometimes, in a conventional dampening system, the use of such an additive improves print quality although its presence in the dampening solution may not be essential. In general, a dampening solution will consist of the following ingredients: Water, with minimal impurities. Acids or bases, depending to a large extent on the ink being used. Acids used include phosphoric acid, citric acid, and lactic acid. Gum, either natural (gum arabic) or synthetic, to desensitize non-image areas-that is, to make them prefer water to ink. Corrosion inhibitors, to prevent the dampening solution from reacting with the plate. Magnesium nitrate is sometimes used; it also acts as a scratch desensitizer and buffer (a substance capable of neutralizing acids and bases in solutions and thereby maintaining the acidity or alkalinity level of the solution). Wetting agents, such as isopropanol or an alcohol substitute, which decrease the surface tension of water and water-based solutions. Drying stimulator, a substance-such as cobalt chloride-that complements the drier in the ink. Drying stimulator is an additive that is used only if ink is not drying fast enough. Typical concentrations are 1-2 oz. of stimulator per gallon (8-16 ml per litre) of dampening solution. Fungicide, to prevent the formation of mildew and the growth of fungus and bacteria in the dampening system. Antifoaming agent, to prevent the build-up of foam. Foam can interfere with the even distribution of dampening solution on the dampening rollers.

@@rj20021968 sir I have a one question

Sir... What is standard density of c,m,y,k

@@uniquevideocreator9712 Standard ink densities? On Coated C- 1.50 M- 1.49 Y- 1.30 K- 1.85 Uncoated C- 1.30 M- 1.40 Y- 1.10 K- 1.50

@@rj20021968 Thanku so much sir

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