General knowledge of coating: introduction to special coating methods of plastics

Core tip: in view of the particularity of plastic and its products, in addition to the general brush coating, roll coating, spray coating, dip coating, air spraying and high-pressure airless spraying, the plastic industry also adopts the following special coating methods ① Barrel coating method Put the simple plastic toys, daily necessities and coating into the circular, hexagonal, octagonal and other rotating barrels, rotate them together for a certain time (generally speaking, several minutes to dozens of minutes), make the plastic surface fully soaked, pull out, drain and bake with the wire mesh The viscosity of the coating should be slightly smaller, controlled at - 4 cups for 16-20s, and the viscosity should be adjusted according to the diameter of the drum Paint knowledge | precautions for wall paint color selection Recommended introduction: when painting the wall, the owner sometimes has difficulty in choosing what color of the wall paint to paint In fact, there is no ugly color in the wall paint, only the disharmonious color matching The use of wall color contains the knowledge of health Too strong color will stimulate people's perception, make people have a sense of fidgety, affect people's mental health Grasp the basic principles of wall color and paint a colorful space 1、 Wall paint color selection notice 1 Light color is generally used for the top surface Light colors make people feel light, dark colors make people feel heavy Usually, the treatment of rooms is from top to bottom, from shallow to deep For example, the ceiling and walls of rooms are white and Paint Home News: in view of the particularity of plastics and their products, in addition to the general industrial brush coating, roll coating, spray coating, dip coating, air spraying, high-pressure airless spraying, the plastic industry also uses the following special coating methods ① Barrel coating method Put the simple plastic toys, daily necessities and coating into the circular, hexagonal, octagonal and other rotating barrels, rotate them together for a certain time (generally speaking, several minutes to dozens of minutes), make the plastic surface fully soaked, pull out, drain and bake with the wire mesh The viscosity of the coating should be slightly small, controlled at - 4 cups for 16-20s According to the diameter of the drum, the rotating speed is generally 20-40r / min if the rotating speed is too fast, the products will be thrown to the wall of the drum without self rotation If the rotating speed is too slow, the products are difficult to roll and the coating film is uneven ② Screen printing Generally used for trademark printing, high-speed roller printing is often used for plastic film ③ Electrostatic spraying With the grounded coating as anode, the coating nozzle as cathode and negative voltage applied, the atomized coating droplets fly with negative charge to the plastic products with positive charge for coating Because plastic is easy to produce static electricity, it is necessary to remove static electricity before normal coating Generally, corona discharge type static eliminator is used to neutralize the opposite charge of plastic surface and generate uneven charge due to friction and other reasons Secondly, the surface resistance of the plastic can be reduced to less than 108 Ω The resistance of the coating should also be controlled within 107 Ω Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,