After the imprint is transferred from the printing plate to the paper through the blanket, it is generally required to be dried in about 10 hours to facilitate the post-color printing or finished product inspection and delivery. Once the imprint is slow to dry, this not only makes the next color impossible to overprint, but also It is easy to make the back of the printed matter sticky and dirty. There are three factors in the drying of blots, such as oxidized conjunctiva, paper absorption, and water evaporation. We must correctly grasp the operation and prevent it in advance. Common causes of slow drying (1) The PH value of the paper is below 6. (2) The PH value of the water bucket is below 3. (3) The water on the plate is large, and the ink is large, which causes serious emulsification of the ink. (4) The workshop temperature is low. The relative humidity is higher than 75%. (5) The absorption of paper is poor. (6) There are too many auxiliary materials such as ink-adjusting oil and debonding agent mixed into the ink. (7) Too little dry oil. Approach (1) In order to prevent the slow drying of the printed matter, the height of the stacked prints should be reduced, the paper stack should be shaken, and the semi-finished product ventilation can allow air to penetrate into the stacked paper and shorten the time of oxidation and conjunctiva. (2) If the printing is urgently needed, the original graphic printing plate is used for dry oil overprinting, the formula is 70% of Wei Li oil and 30% of dry oil. (3) In order to prevent the factors of unfavorable drying, add an appropriate amount of dry oil. The amount of dry oil is: winter is more than summer, the latter color is more than the previous color, and the diluted ink is added more than the undiluted ink. Overprinting phenomenon Excessive dry oil is added to the ink or the stacking time of the semi-finished products is too long, resulting in too fast drying and causing the glass surface of the imprinted surface to become too smooth. The imprinted surface is too smooth and loses its ability to adsorb. The next color cannot be printed. This kind of failure is common in the full version of the field, especially the yellow version (ink) or line pattern printing. Approach (1) For prevention, add appropriate amount of auxiliary materials such as Viley oil, Kangbang, magnesium carbonate powder to the yellow ink that is easy to vitrify in advance to make the surface conjunctiva rough or prolong the drying time. (2) If the vitrification phenomenon has occurred and the next color cannot be printed, if the number of products is small, use a soft cloth dipped in magnesium carbonate powder to gently wipe the surface ink film of each sheet, and then apply the next color, if Large quantity, it can be printed by coloring while caustic soda. If you are searching for an Adjustable Sit Stand Stool, then this would be an excellent choice. You can experience the extraordinary performance while using this device.
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Slow drying of blots