PH value PH value ■ PH value of the viscosity of the ink ink ink application affects another indicator of the need to control its normal range of 8.5 to 9.5, then the best water-based ink printing performance, the most stable printing quality. Due to volatilization of ammonia continuously during the printing process, the operator also from time to time to the ink in the new ink and the various additives added, so the PH value of the ink may change at any time. PH value using a standard meter, you can easily measure the PH value of ink. When the PH value is higher than 9.5, too alkaline, water-based ink viscosity decreases, slow drying rate, poor water resistance, prone paste version; and when the PH value is lower than 8.5 i.e. weak alkaline, the water based ink viscosity increases, and ink is easy to dry, to the version of the block and the anilox roll, causing the layout dirty, and create a bubble. PH value impact on water-based ink printability mainly in ink viscosity stability and dry in terms of clarity and outlets. With the increasing value of PH, ink viscosity decreases, the drying speed is slow. Application experience water-based ink in cardboard printing process often encounter some problems, analysis and solutions may refer to the following: ◆ printing pressure adjustment is critical, which includes a pressure plate and between the substrate and the anilox roll and between the plates pressure. If the ink viscosity is too high, too fast ink drying problems, the solution is to adjust the pressure, diluted ink, slow drying agent added. ◆ ink dry on the plate, printing blurred edges, it may be on the hot air blown plates, paper fibers mixed with ink resulting in static response, elimination approach is diluted ink and gradually speed flexographic printing, will cover the flexo ink system copy, or replace ink mounted to an electrostatic device. The concentration of the developer refers to the relative concentration of the developer level of the developer, i.e., NaOH, Na2SiO3 total content. On the market are mostly concentrated liquid developer, need to be diluted in proportion to the use, in order to dilute the concentration of the developer more than the developer is to represent. Under other conditions the same premise, developing speed is proportional to the concentration of the developer, the developer that the greater the concentration, the faster development. When the temperature is 22 ℃, the development time of 60 seconds, the impact of PD-type developing solution concentration on the performance of the PS version is shown in Table 1 (omitted). As can be seen from the data in the table, with three clean prevail exposure flexo, PD-type developing solution concentration 1/6 for the best. When the developer concentration is too high, often because developing too fast leaving the developing operation is difficult to control; particularly its foundation corrosive enhanced graphics, making it easy to narrow outlets, damaged, bright tone small dot loss and thinning coating flexo plate making company, resulting in decreased anti-Indian forces and other ills; at the same time a blank part of the oxide film and the sealing layer is also subject to corrosion and damage, layout blush appear to make plates and wear resistance deteriorates hydrophilic . The developer concentration, but also tend to have crystallized. When a low concentration of the developer, weak alkaline developing slow, prone to developing without a net, layout from dirty, darkened paste dead white point and so on. Normal concentration of the developer through the dot-foot ladder test; exposure under normal conditions when developing 30 to 100 seconds, if there are more black specks lost concentration when the developer explained too big; Description developing white spots if there are more lay dead when low concentration. So it is best to use a developer within the range specified by the manufacturer concentrations. Flexographic printing down _ _ Dunlop flexo platemaking provided by Dunlop Advertising Co., Ltd., Zhengzhou. Zhengzhou Dunlop Advertising Co., Ltd. (#) strong, credible, in Zhengzhou, Henan Province of plate making, printing supplies and other industries has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead the Dunlop plate and you hand into the brilliant, for a better future!