Glass screen printing inks sometimes have bubbles on the ink after printing. The main reasons for the generation of bubbles are as follows:
1. The substrate is poorly processed before printing. 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 glass screen printing ink forms a flat printed ink film. If the glass screen printing ink bubbles are not eliminated, the ink film will form an annular uneven film surface. Generally, the bubbles in the glass screen printing ink can be defoamed by the action of the screen when passing through the screen;
2. Bubbles are generated if the printing speed is too fast or the printing speed is not uniform. The printing speed should be appropriately reduced to maintain the uniformity of the printing speed;
3. Electrostatic failure The electrostatic current is generally small, but the potential difference is very large, and one can attract, repel, conduct, discharge, etc.
4. The adverse effect on screen printing, the screen at the time of printing, the rubber portion and the screen are charged by the pressure scraping of the blade rubber. If 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;
5. Methods to prevent static electricity, to prevent static electricity generation: adjust the ambient temperature, increase the air humidity, the appropriate temperature is generally about 20 ° C, relative humidity of about 60%; can make static electricity in the wet air; reduce the network distance , reduce the printing speed.
Glossy characteristics:
1. Printed on the instant baking to show flat ink;
2. Printed for 3 hours and then baked as a bright ink;
3. Add a little more diluent and bake it as a bright ink.
dry:
1. After adding 8:1 hardener, dry naturally, dry for 40-60 minutes; dry for 12-24 hours;
2. After adding 8:1 to 10:1 hardener, it can be baked at a low temperature of 80-120 degrees in 30 minutes, and if it is baked at 120-150 degrees for 10-30 minutes, its solvent resistance and paying power are better.
Printing method: silk screen, pad printing.
Resistance:
1. After the ink is completely dried, the ink film exhibits a good paying force, alcohol resistance and abrasion resistance.
2. Because it can be baked and low-temperature baking, it is suitable for printing on materials such as reinforced acrylic, mobile phone lens, plastic plating surface, and plastic UV fuel injection surface.
3. For special materials, there are high requirements for alcohol resistance, sweat resistance, wear resistance and other products, such as machine metal knobs, anodized aluminum digital camera shells, glass cosmetic bottles, metal eye legs, etc., baking with 120-150 degrees 10- The effect is better after 30 minutes.
Scope of application: metal, electroplated surface, ceramic, painted surface, reinforced acrylic, hardened acrylic, UV spray surface, flame treated PP, PE, etc.; good adhesion to hard materials.
Zhongshan Zhongyi Ink Coating Co., Ltd. is located in Port Town, Zhongshan City, Guangdong Province. It is one of the top ten brand manufacturers and suppliers of environmentally friendly silk screen printing ink industry in China. It is a national investment agent and joins cooperation. It specializes in producing and supplying uv printing ink and pvc screen printing ink. Pet water-based offset printing glass ink, printing materials, color crystal four-color printing ink, ink additives, printing equipment, plate making materials.
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