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Plexiglass products processing, there are some plexiglass products need to be plexiglass screen printing, but when the graphic printing parts of the dirt or has been dry silk screen ink solid, such as silk screen plexiglass signs, Sewage treatment, stop the press after the lifting of the network box, then some operators will be dipped in solvent with the abrasive cloth wipe the lower side of the stencil, the sound of the entire printing workshop can hear, often the template damage The
A really knowledgeable operator rarely goes hard to rub the stencil of the graphic surface because he knows that the clarity of the printed graphic requires all graphic edges to keep the clear layer of the emulsion layer. Forced friction will damage the emulsion layer graphic interface, or even wipe the emulsion layer, leaving only the bare mesh. In the printing of high-line number of color images, the wire below the emulsifier film is only 5-6μm thick, the mesh itself, the diameter of the thread may be only 30μm, can not withstand the force of friction. Therefore, the key to avoiding rough decontamination is to first prevent the stencil from being contaminated. The main reason for the contamination of the stencil is that the ink control is not correct, leaving the dry ink in the mesh. When using solvent-based inks or water-based inks, the reason is that the ink is thin or too thick. It should be in the amount of ink in accordance with the provisions of the amount of additives. In addition, in the printing production is often a small amount of some pre-adjusted with the ink, to maintain the state of ink does not change Hua. When using UV curing ink, you should try to avoid the screen by UV light irradiation, but also to avoid sunshine. Another ink control problems and improper printing speed control. Automatic or manual operation of the printer speed control will lead to improper supply of uneven, so that the lack of ink through the mesh quickly dry solid.
The last reason that causes the ink to dry is that the wipes are improperly arranged or have been worn, and when the subtle image is printed with a high number of lines, it is desirable to use a sharp wiper blade with a sharp angle of about 75 degrees. As the wiper blade in the normal use will be deformed or worn, the surrounding image clarity will decline, which indicates that the ink may not normally through the mesh, if the problem is not resolved in time, the ink will Dry in the mesh. To avoid this problem, turn the wiper head regularly to extend the service life of the wiping edge, or replace the new wiper blade before the graphic print quality has not fallen. In order to make the normal function of the mesh, should also pay attention to clean up the ink or plexiglass on the dirt.
The surface of the plexiglass will be stained due to the presence of contaminants in the air and the poor storage conditions. The above problems can be solved by improving the storage conditions and process control. In addition, the use of static electricity and plexiglass decontamination devices To prevent dust and dirt from the plexiglass surface transferred to the mesh. If the template is contaminated should be how to deal with it? In the use of platform screen printing presses, to print a set of sheets after India to stop printing machine, and then enter a blotter paper, so that the screen with the suction ink contact The Let the screen in the printing position, and then dip with a screen cleaning agent of non-friction soft cloth to wipe the mold scraping face dirt, do not force too much, so that dirt will fall through the mesh The following absorbent paper, if necessary, can be re-use a water-absorbing paper to clean the mesh. Some of the dirt on the top of the dirt may be large, can not cross the mesh, but with a soft cloth can be sticky. After cleaning, you can use the hair dryer (transferred to the "cold") dry template. In the cleaning round press screen printing machine, will encounter a different situation. Due to the design of the structure of the reasons, not like cleaning ordinary screen printing press as dirt on the absorbent paper. Fortunately, because the printing speed is relatively fast, the ink in the hole dry is unlikely. If this happens, first stop the printing press while printing a set of workpieces, and then dipped the screen cleaner or diluent onto the top of the template at the printed graphic area with a non-abrasive soft cloth. Do not leave too much cleaning agent at the top of the template. The purpose of this time is to use the solvent to wash the dirt inside the mesh. Sometimes you want to clear the dirt below the template. In this case, you should gently wipe the dirt with a soft cloth, do not force the side fierce. In the production process should often use the above cleaning decontamination way to extend the stencil life, reduce scrap rate.