Plexiglass product processing silk screen decontamination treatment method

When processing plexiglass products (display racks, display boxes), some plexiglass products require plexiglass screen printing, but when there are dirt on the printed parts of the text or solid screen printing ink solids, such as silk screen plexiglass signs , You should decontaminate the silk screen, stop the printing machine and lift the screen frame, then some operators will use the abrasive cloth dipped in the solvent to wipe the underside of the stencil vigorously. Hearing, often the template is damaged.

A truly knowledgeable operator rarely rubs the graphic printing surface of the template hard, because he knows that the clarity of the printed graphic requires all graphic edges to maintain a clear emulsion layer graphic interface. Rubbing hard will damage the graphic interface of the emulsion layer, or even wipe off the emulsion layer, leaving only bare mesh. When printing color images with high screen counts, the emulsifier film under the wire is only 5-6 μm thick, and the wire diameter of the mesh itself may be only 30 μm, which can't stand strong rubbing. Therefore, the key to avoid rough decontamination is to prevent the template from being contaminated. The main cause of stencil contamination is incorrect ink control, which causes dry ink to remain in the mesh. When using solvent-based inks or water-based inks, the reason is that the ink is thin or too thick. Additives should be blended according to the prescribed amount when adjusting ink. In addition, some pre-adjusted inks are often added in a small amount in printing production to keep the state of the ink from changing. When using UV-curable inks, you should try to prevent the screen from being exposed to ultraviolet light, and to avoid sunlight. Another ink control problem is related to improper printing speed control. Improper adjustment of the speed of automatic or manual operation of the printing press will result in uneven supply, which will quickly dry the mesh that receives insufficient ink.

The last reason that causes the ink to dry is that the squeegee is improperly adjusted or has been worn. When printing fine-grained images with a high screen count, it is required to use a squeegee with a sharp edge of the ink, and the horizontal line angle is about 75 degrees. As the squeegee will be deformed or worn during normal use, the sharpness of the surrounding image will decrease, indicating that the ink may not pass through the mesh normally. If this problem cannot be 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 edge, or a new squeegee should be replaced before the quality of graphic printing has not deteriorated. In order to make the mesh function normally, you should also pay attention to clean up the dirt in the ink or on the organic glass.

Due to static electricity adsorption of pollutants in the air and poor storage conditions, the surface of the organic glass will be contaminated with dirt. The above problems can be solved by improving the storage conditions and process control. In addition, the use of static removers and organic glass decontamination devices can also be used Prevent the transfer of dust and dirt from the surface of the organic glass into the mesh. What should I do if the template 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 to make the screen contact the blotting paper . Keep the screen at the printing position, and then use a non-abrasive soft cloth dipped in a screen cleaner to wipe off the dirt on the squeegee surface of the stencil. Do not apply excessive force, as the dirt will fall through On the absorbent paper below, another piece of absorbent paper can be used to repeatedly clean the mesh if necessary. Some dirt particles that fall on the top may be too large to pass through the mesh, but they can be glued together with a soft cloth. After cleaning, the template can be dried with a blower (adjusted to "cold air"). When cleaning a round-press screen printer, you will encounter different situations. Due to design and structural reasons, dirt cannot be washed down on absorbent paper like ordinary screen printers. Fortunately, because the printing speed is relatively fast, the possibility of the ink drying in the mesh is not high. If this happens, first stop the printing machine after printing a set of jobs, then use a non-abrasive soft cloth to dip the screen cleaner or thinner on the top of the template for printing graphics and text. Do not leave too much cleaning agent on the top of the template. The purpose at this time is to wash the dirt in the mesh with a solvent. Sometimes it is necessary to remove the dirt under the template. In this case, you should gently wipe off the dirt with a soft cloth, and do not use force. In the production process, the above cleaning and decontamination methods should be frequently used to extend the service life of the template and reduce the scrap rate.