Technical guidance GRAPHIC CHEMICALS

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Technical guidanceCaution! The remaining Cleaner may neutralize fresh developer.P-60G REMOVER GEL is a gel used for the same purpose as the liquid P-60. Its advantage is reducedconsumption, since it is applied only on the rollers and walls of the developing machine. Gel is left for certain timeto work, and then washed off thoroughly with water.OTHER CHEMICALSP-72 ANTITON-P – For neutralization of developer remains from the plate and to prevent toningP-77/1 ANTI FOAMING AGENT – developer adding agent to avoid foaming duringmachine developingP-72 ANTITON-P is used to neutralize the remaining alkaline developer after the developing is done. It also actspreventively towards the occurrence of toning during printing.Instruction for use: Pour P-72 over the plate, let it work for half or one minute and rinse the plate well with water.Too long action may cause plate blinding.P-77/1 ANTI FOAMING AGENT is added to the developer in automatic plate processor. It reduces foam formingof partly used developer during pumping. Add P-77/1 to the developer several times in small doses. The dosagedepends on the amount of used-up developer.P-77/1 ANTI FOAMING AGENT also serves as a universal additive to prevent foaming of fountain solution andcleaning solution foaming.The perfect effect is achieved by adding small quantities of P-77/1 (up to 0.1%).GRAPHIC CHEMICALSOFFSET PRESSCHEMICALS FOR FOUNTAIN SOLUTIONSThe structure of fountain solution effects on quality of print. These chemicals reduce surface tension and allowprinting with reduced water quantity. Chemicals used for preparation of fountain solution contain agents whichmaintain stable pH value.P-43 Prepared Isopropyl Alcohol – prepared isopropyl alcohol 99,9%P-41 SUPER BUFFER – classic bufferP-50 UNI BUFFER – buffer for printing without alcoholP-51 UNI PLUS BUFFER – concentrate bufferP-55 EKO BUFFER – buffer for printing with reduced quantity of alcoholP-55R EKO BUFFER-R – buffer for web offset printing with less alcoholP-56 ALCOHOL BUFFER – buffer for using alcohol fountain solutionChemicals contain ingredients which prevent algae and fungi growing in the fountain solution and dampeningsystems and do not cause corrosion.P-43 Prepared Isopropyl Alcohol is used in presses with alcohol dampening. Around 20% of P-43 can beadded, depending on the printing conditions.P-41 SUPER BUFFER is used for all types of offset plates. It is based on isopropyl alcohol and has to be dilutedwith water (1 l of P-41 per 10 l of water). The pH value of fountain solution is between 5 and 5.5. Applying such4/6
Technical guidancesolution provides a constant balance between water and ink in a wide range, proper harmony and better imprintcontrast.Adding P-50 UNI BUFFER depends upon the desired pH and initial hardness of water. Depending on the systemof dampening, our recommendation is to add from 1 to 3%, thus reaching the dampening water pH from 4.7 to5.5. Start with lower additive, and gradually increase till you reach optimum print quality.If requirement and printing conditions entail adding isopropyl alcohol (IPA), its concentration must be predeterminedwith a test. Initial quantity must be not less than 3% of P-43 Prepared isopropyl alcohol.Buffer ingredients prevent formation of algae, corrosion of printing machine components and buildup of lime.P-51 UNI PLUS BUFFER Concentrate for sheet fed and web offset printing. Add P-51 into water 2 – 3% and upto 10% of isopropyl alcohol. It is used for conventional and UV inks. P-51 prevents formation of calcium depositsand algae in dampening system as well as corrosion of dampening system.P-55 EKO BUFFER is buffer for printing with reduced quantity of alcohol. It is buffer for sheet fed and web offsetprinting. P-55 stabilizes pH value of damping solution, buffer ingredients prevent formation of algae, preventcorrosion of printing machine components and buildup of lime.Our recommendation is to add from 2 to 4 % of P-55. The quantity depends on the quality of water. Therecommendable dosage of P-43 Prepared Isopropyl Alcohol is from 8 to 10 %.The influence of water hardnes on the pH value offountain solution5,6pH value of fountain solution5,55,45,35,25,154,9P-55 2% by volumeP-55 3% by volumeP-55 4%by volume4,87 14 21water hardness °dHTable: pH Value and electrical conductivity of the solution depending on the water qualityTap waterConductivity 744µS/cmHardness 21 o dHTap waterConductivity 449µS/cmHardness 14 o dHP-43IPA 44Conc. P-55 66without 10% without 10%pH Conductivity pH Conductivity pH Conductivity pH Conductivity2% 5,48 1063 5,62 755 5,22 992 5,33 7093% 5,26 1474 5,37 1056 5,06 1391 5,16 10034% 5,14 1831 5,25 1311 5,00 1737 5,08 12685/6
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Technical guidance GRAPHIC CHEMICALS

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