The printing plate is not resistant to printing and swell, which makes the imprint blurred and rough (1) Insufficient exposure and insufficient hardening during the plate-making of the photosensitive resin plate. Therefore, shortly after printing, it will swell and blur under pressure and ink infiltration, which can only be solved by re-making the plate. (2) The ink contains a lot of benzene solvents, which causes the plate to swell, which can only be solved by changing to a good ink. (3) The mixed solvent added in the printing process contains a certain amount of benzene. Although the amount is small, the plate will swell when the time is long, so care should be taken. Blotting and poor gloss (1) The volatile drying properties of the ink are unbalanced, especially when too much ethanol is added during the printing process, too fast and unbalanced volatilization will make the synthetic resin conjunctiva not smooth, and the gloss will be poor in the light and white in the heavy. If isopropanol and n-propanol are added, the situation may improve. The ink factory has a matching supply of quick-drying and slow-drying thinners, which contain synthetic resins and solvents with appropriate proportions. It can accelerate the dry thinner in winter, and slow down the thinner in summer, so that the disadvantages of poor gloss and whitening will not occur. (2) If water-containing ethanol is added to the ink, even if the amount is not large, it will leave moisture when the ethanol evaporates, resulting in poor resin conjunctiva, resulting in loss of gloss and whitening, and should be avoided. Isopropanol also sometimes contains more water, which should also be noted. (3) Flexo printing inks are mainly based on alcoholic solvents, which are easy to absorb moisture. The humidity in the workshop is too high, and it is easy to make the printed ink film lose gloss and whitening. Should reduce the humidity of the workshop to solve. Blotting is easy to erase When printing for a long time, too much solvent is added to the ink, so that the content of the synthetic resin is relatively reduced to a certain degree, and the conjunctiva of the ink layer is poor, resulting in pulverization. Add some synthetic resin when adding solvent, or use ink The fast-drying or slow-drying diluent supplied by the factory can avoid powdering. Prints found pinholes (1) The wettability between the ink and the surface of the substrate is too poor, so that the printed ink layer partially shrinks to generate pinholes. Glycol ether and other substances can be added to the ink to increase wetting and leveling, and to improve the pinhole phenomenon. (2) The surface of the plastic film is stained with paraffin, lubricant and other substances, so that the printed ink cannot be wetted, and the printed ink layer has pinholes. Need to clean the surface or do oxidation, corona, flame treatment to improve the pinhole phenomenon. Print pattern is not clear (1) The print pattern is not clear, the dots are connected or the edges are fluffed. In most cases, the ink dries too fast and there is already a drying phenomenon on the plate; or the ink viscosity is too large and the ink absorption on the plate is too much, which makes the dot pattern dots Connected or fluffed at the edges. Slow-drying thinner should be added to reduce dryness and viscosity. (2) In most cases, the thickening of the ink layer on the edge of the printed pattern is that the ink dries too quickly. When the printer runs for a long time, the viscosity increases, and the thickening of the ink layer on the edge of the printed pattern can be solved by adding a slow drying thinner. Prints stick to each other (1) The workshop temperature is high, the humidity is high, and the printing speed is fast. The ink is not dry and cold after rewinding after printing, so that it adheres to the back of the printing. Care should be taken to improve the above printing conditions. (2) Blocking occurs at a period after the packaging of the printed parts is bundled and stacked. One of the reasons is that slow drying and more residual solvents are added during the printing process, such as butanol. Should try not to add or less. Another reason is that the ink is mixed with substances that have oxidizing properties, which causes the ink to be oxidized and sticky during a long storage period. The mixing of such substances should be absolutely avoided. (3) The storage conditions of the prints are not good. For example, if the temperature of the warehouse is too high, the humidity is too high, and the pressure of stacking the prints is too high, it will cause adhesion. The above storage conditions should be improved. Cup Sealing Film,Film For Plastic Cup,Roll Form For Cup Sealing,Foil Sealing Film Guangdong Danqing Printing Co., Ltd. , https://www.spoutpouchfactory.com