First, the difference in tracking fastness
Causes and solutions:
1. The surface tension of PE or PP film is lower than (3.6-3.8×10-2N/m). The surface tension measuring liquid checks the surface tension of the film, and if it does not meet the requirements, it should be reprocessed.
2. The ink is diluted too dilutely, the binder is destroyed or the diluent is used incorrectly. When diluting the ink, the viscosity is preferably controlled at 25-35 seconds (coating 4# cup). In addition, the choice of thinner should be careful, do not use it wrong, so as not to affect the quality of the ink.
3. The adhesion of the ink itself to the film is poor. The ink type should be replaced or the ink manufacturer should contact.
Second, the footprint is lost
Phenomenon: During the printing process, small characters and thin lines are lost at the beginning, and no pattern can be printed in serious cases.
Causes and solutions:
1. The ink viscosity is too high and does not match the printing speed. Adjust the ink viscosity to a suitable value.
2. The ink drying speed is too fast, and the printing speed is too slow. Add slow-drying diluent (or n-butanol slow-drying solvent) to the ink, but strictly control the amount of addition, such as adhesions such as excessive adhesion.
3. The plate mesh is too shallow and needs to be re-plated.
4. The blade angle and position are not appropriate. The normal blade angle is generally between 30-60°, which not only keeps the blade edge from being damaged, but also prints the ink layer better. The position of the scraper should be determined by the drying condition of the ink. If the ink is dried too fast, the scraper can be moved forward appropriately.
Shorten the distance between the blade and the embossed point.
5. Adjust the hot air position by giving the hot air position improperly.
Third, overflow ink
Phenomenon: The surface of the printed surface has spots, patterns, or ink that overflows from the line.
Causes and solutions:
1. The viscosity of the ink is low after dilution. Add some of the original ink, adjust the viscosity for 25-35 seconds (current task 4# cup); or empty the machine for a period of time, so that the solvent is evaporated a part, the viscosity of the ink is increased to the appropriate value.
2. The printing speed is too slow, or the ink drying speed is slow, the printing speed is increased, or the drying thinner is accelerated to the ink.
3. The printing plate is too deep or worn, and needs to be re-plated.
4. The blade hardness, pressure and angle are not appropriate. Adjust the blade pressure and angle, and polish the blade edge to reduce the hardness.
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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