Flat glass printing suitability and ink printing suitability control
[China Glass Net] The screen printing process of glass is based on the principle of screen printing, printing ink onto the surface of the glass, and then using the curing measures of the ink, the printed pattern is firm and durable. The process flow is as follows: stretching net → sizing → drying → printing → development → drying ↓ flat glass → cutting → edging → cleaning and drying → printing ↓ sintering 1 . The glass suitable for printing cuts the glass according to the user's requirements. It can be a regular shape or an irregular shape, then it can be edge-grinded, then cleaned and dried for use. Special care should be taken here that there should be no water marks on the glass surface. 2. Screen Selection The screen printing plate for glass printing is the same as the general screen printing plate. The glass screen printing plate is made of synthetic fiber mesh, stainless steel wire mesh and natural fiber mesh. When printing general color materials, the above-mentioned screens can be used, generally using inexpensive synthetic fiber mesh; when used as gold and silver decoration, stainless steel wire mesh cannot be selected. The specifications of the wire mesh are generally 270 to 300 mesh. 3. The selection of the frame is relatively regular, and the frame that is not deformed is an aluminum alloy frame. Its size should be larger than the pattern. The specific size should be that the outer edge of the pattern should be between 70 and 100 mm. In addition to selecting the frame, its strength is very important, the key is that the rigidity in the horizontal direction is sufficient. 4. The mesh and the mesh frame are selected in the stretch net, and the two are combined. This is the stretch net. There are many ways to stretch the net. It can be manually, maneuvered or pneumatic. At present, the more advanced, high-quality screen is a pneumatic stretcher. The requirement of the stretch net is that the tension is uniform, the web warp and weft are kept vertical, and the adhesive mesh is firm and cannot be slack.
Bubble glass sometimes has bubbles on the ink after printing. The main reasons for the bubble are as follows: 1. The substrate is poorly printed before printing. The surface of the substrate is attached with dust and oil stains; 2 bubbles in the ink. In order to adjust the ink, when adding solvent and additives for stirring, some bubbles will be mixed in the ink. If left unattended, the ink with low viscosity will naturally defoam, and some inks with high viscosity will not be naturally defoamed. Some of these bubbles are naturally removed during printing due to the transfer of ink, and some are becoming larger and larger. In order to remove these bubbles, an antifoaming agent is used, and the amount of the antifoaming agent in the ink is generally about 0.1 to 1%, and if it exceeds a predetermined amount, it will foam. Even if the ink is transferred after the transfer, as long as the wettability of the substrate and the fluidity of the ink are good, the bubbles on the surface of the printed ink film are gradually eliminated, and the ink forms a flat printed ink film. If the ink bubbles are not eliminated, the ink film forms an annular uneven film surface. Generally, the bubbles in the ink can be defoamed by the action of the screen when passing through the screen; 3 the printing speed is too fast or the printing speed is uneven, and bubbles are generated. The printing speed should be appropriately reduced to maintain the uniformity of the printing speed. 6. Electrostatic failure Electrostatic current is generally small, but the potential difference is very large, and there may be phenomena such as attraction, repulsion, conduction, and discharge. 1 adverse effects on screen printing. The screen at the time of printing heats the rubber portion and the screen due to the pressure scraping of the blade rubber. When the screen itself is charged, it will affect the normal inking and cause the jamming failure; it will be sucked by the screen at the moment of the output of the substrate; 2 The method of preventing static electricity. The methods for preventing static electricity generation include: adjusting the ambient temperature and increasing the humidity of the air. The appropriate temperature is generally about 20 ° C, and the relative humidity is about 60%; the static electricity can be transmitted in the wet air; the mesh distance is reduced, and the printing speed is reduced.
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