The commonly used process of plastic spraying bridge is electrostatic powder spraying. The plastic powder is electrified by using electrostatic generator, then adsorbed on the surface of iron plate, and then melted and adhered to the metal surface by baking at 180 ~ 220 ℃. Generally speaking, plastic spraying products are mostly used on the box used indoors, and its paint film has a kind of flat or matte effect. Spray powder common polyester powder and acrylic powder and so on. Xiaobian will share with you the electrostatic plastic spraying process flow of plastic spraying bridge.
Objective: to remove the dirt such as oil, dust and rust on the workpiece surface, and form a "phosphating layer" on the workpiece surface that can increase the adhesion of spraying coating;
Process steps: degreasing, derusting, phosphating and passivation;
After pretreatment, the workpiece can remove oil, rust and dust, and also make the original silver white shiny surface have the ability of rust prevention and increasing the adhesion of the plastic spraying layer because of a layer of gray phosphating film which is uniform, not rough and not easy to rust.
2. Electrostatic spraying
Objective: evenly spray powder coating on the surface of workpieces. Special workpieces prone to electrostatic shielding should be sprayed by high-performance electrostatic spraying machine;
According to the principle of electrostatic adsorption, a layer of powder coating can be sprayed evenly on the surface of the workpiece; Then the recovery system can recover the dropped powder, which can be reused after screening.
3. High temperature curing
Objective: after the powder coating on the surface of the workpiece is heated to a certain temperature and kept warm for a corresponding time to melt, level and solidify it, so as to obtain the desired surface effect of the workpiece.
Process steps: push the sprayed workpiece into the curing furnace, heat it to the predetermined temperature (generally 185 degrees), and keep it warm for corresponding time (15 minutes); Open the furnace and take it out for cooling to obtain the finished product.
Tip: heating and control system (including electric heating, oil, gas, coal and other heating methods) + insulation box = curing furnace.
4. Decoration treatment:
Objective: the workpiece after electrostatic spraying has a special effect on the appearance, such as various wood grain, pattern, brightening, etc.
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