During the processing of plexiglass, some plexiglass products require plexiglass screen printing, but when there is dirt or dried screen printing ink solids on the graphic printing part, such as screen printing plexiglass signs, the screen should be decontaminated To deal with it, stop the printing press and lift the screen frame. At this time, some operators will use emery cloth dipped in solvent to vigorously wipe the underside of the stencil. The loud sound can be heard throughout the printing workshop, and the stencil is often damaged. The last cause of ink drying is that the squeegee is improperly adjusted or worn. When printing fine-grained images with a high screen count, a squeegee with a sharp squeegee edge is required, and the horizontal line angle is about 75 degrees. Because the squeegee will be deformed or worn during normal use, the image clarity around the periphery will decrease, which indicates that the ink may not pass through the mesh normally. If this problem is not solved in time, the ink will Dry and solid in the mesh. In order to avoid the above-mentioned problems, the squeegee should be turned over regularly to extend the service life of its squeegee, or it should be replaced with a new squeegee before the quality of graphic printing has not deteriorated. In order to make the mesh work normally, you should also pay attention to cleaning up the dirt in the ink or on the plexiglass.
Due to electrostatic adsorption of pollutants in the air and poor storage conditions, the surface of plexiglass will be stained with dirt during processing. The above problems can be solved by improving storage conditions and process control. The electrostatic device and plexiglass decontamination device can also prevent the transfer of dust and dirt from the surface of the plexiglass into the mesh. What should I do if the stencil is contaminated? When using a flat screen printer, stop the printer after printing a set of sheets, and then input a piece of blotting paper so that the screen is in contact with the blotting paper . Keep the screen in the printing position, and then use a non-abrasive soft cloth dipped in screen cleaner to wipe off the dirt on the scraping surface of the stencil. Do not use too much force, so that the dirt will fall through the mesh On the absorbent paper below, if necessary, use another absorbent paper to repeatedly clean the mesh. Some of the dirt particles that fall on the top may be too large to pass through the mesh, but they can be stuck with a soft cloth. After cleaning, you can use a hair dryer (set to 'cold air') to dry the template. When cleaning the circular press screen printing machine, you will encounter different situations. Due to the design structure, the dirt cannot be washed off the absorbent paper like the ordinary screen printing machine. Fortunately, because the printing speed is relatively fast, the possibility of ink drying in the mesh is unlikely. If this happens, first stop the printer when printing a set of jobs, and then use a non-abrasive soft cloth to dip the screen cleaner or thinner on the top of the template for the printed image and text. Pay attention Do not leave too much cleaning agent on the top of the template. The purpose at this time is to scrub the dirt in the mesh with a solvent. Sometimes it is necessary to remove the dirt under the template. In this case, you should wipe off the dirt gently with a soft cloth, don't force it. The above cleaning and decontamination methods should be frequently used in the processing of plexiglass to extend the service life of the template and reduce the rejection rate.