Cleaning of mesh rollers
The ink volume transferred to the printing version when the mesh roller rotates is actually a variable, which is affected by multiple factors. Under normal circumstances, the amount of ink filled in the ink acupoint can be transferred to the printing version of about 70-80%. Even though the stability and dispersal uniformity of the ink itself meet the quality requirements, and the manufacturing accuracy of the mesh roller is also very high, the amount of ink transferred to the printing version is very limited. When the stability of the quality of the print is severely damaged, the root cause is not the performance of the ink itself, nor the accuracy of the mesh roller, but because the mesh roller is blocked by the ink that the ink is solidly in the ink during the work process. Cause. The dry ink at the bottom of the ink hole, especially the water -based ink, is difficult to dissolve in the new ink after drying, unless the dissolution time is long. The blocking failure will reduce the effective ink volume of the ink acupoint.
There are three basic reasons for their obstruction: A. When the seal is replaced, the mesh roller is not cleaned thoroughly; B. It is stopped for a long time without cleaning the mesh roller; C. The drying performance of the ink is too fast. "If you want to be good, you must first benefit your instrument." Therefore, to keep the ink volume accurately transmitting, it is necessary to reasonably clean the mesh roller.
There are the following 5 cleaning methods:
Chemical solvent brush method
Spray the chemical solvents on the surface of the mesh roller. According to the mesh roller material, the appropriate fine brush (ceramic mesh roller brushes with a stainless steel brush for the metal mesh roller). This method is only suitable for cleaning the mesh roller of the thick network cable. The advantages are low cost, convenient cleaning, and no pollution environment; the disadvantage is that it cannot go deep into the ink hole, so the cleaning is not thorough. It is difficult to clean the dirt and accumulation of ink at the bottom of the ink hole. Therefore, ink accumulation cannot be restored.
Chemical solvent soaking method
All or partially invading the mesh roller into the high pH deserve to be strongly corrosive cleaning agent groove, let the solvents dissolve the ink that softes and softes, and finally use water to remove the corrosive cleaning solution and the ink that is sufficiently corrosive and softened. Although this method, although this method is It is more effective, but for a long time, the corrosive solvent will penetrate the protective layer, corrosive steel, and it is not conducive to environmental protection.
Ultrasonic cleaning method
Place mesh rollers in a slot with a chemical cleaner solution with a chemical cleaning solution. The internal frequency conversion device is sent to a high -frequency sound wave. With the combined effect of the introverted explosion generated by the bubble -oriented explosion surface, one place from the ink acupoint and flow away with the cleaning liquid. The cleaning time depends on the obstruction of the size of the roller, which is generally required to be 0.5-24h. During this time, the mesh roller is under high -frequency ultrasonic vibration for a long time, which will destroy the ceramic layer. For the ink layer of the mesh roller, the ink acupoint will cause certain damage. In addition, this method covers a large area, high investment costs, and complicated craftsmanship. Although there is a certain cleaning effect, whether this method is perfect, it still needs to be inspected.
Low -pressure spray washing
Use sodium carbonate, baking soda, as clean powder, and spray mesh rollers under low -pressure under low pressure. It can completely clean the dry ink, resin, coating, etc., which can be completely cleaned in the ink acupoint. It is possible that the ceramic soil layer is separated from the mesh roller, and the general pressure must not exceed 0.1MPa. Because sodium carbonate and sodium bicarbonate are a softened cleaning medium, which is easy to dissolve, non -toxic and harmless, meets today's global environmental protection requirements. Practice has proved that the cleaning effect of this method can restore the ink acupoint accumulation, and can be cleaned directly on the spot, including ink, oil, and ink. Although this method has only developed in recent years, it has great potential and
Worthy of promotion.
Plastic fine beads spray cleaning method
The principle is similar to the low -voltage spray washing method, but the plastic beads are used for cleaning powder. This cleaning method can increase the cleaning speed of the mesh roller by 30%, and while improving the quality of the print, it can also extend the service life of the mesh roller. This method has less consumption of plastic fine beads, and the cleaning process does not have any harmful substances and the precipitation of chemicals, which is conducive to environmental protection, efficient and safe.
