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.

1、前处理：

1. Pretreatment:

目的：去除工件表面上的油污、灰尘、锈迹之类的污垢，而且可以在工件表面形成一种能够增加喷涂涂层附着力的“磷化层”；

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;

工艺步骤：除油、除锈、磷化、钝化；

Process steps: degreasing, derusting, phosphating and passivation;

工件经过前处理后可以除去油、锈和尘，也可以使原来银白色有光泽的表面因为有了一层均匀不粗糙不易生锈的灰色磷化膜而具有防锈和增加喷塑层的附着力的能力。

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、静电喷涂

2. Electrostatic spraying

目的：均匀的喷涂粉末涂料于工件的表面，易产生静电屏蔽的特殊工件宜采用高性能的静电喷塑机来完成喷涂；

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;

工艺步骤：

Process steps:

根据静电吸附原理，可以均匀喷一层粉末涂料于工件的表面；然后回收系统可以回收掉落下的粉末，待将这些粉末过筛后可以再次使用。

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、高温固化

3. High temperature curing

目的：待工件表面的粉末涂料加热到一定温度后，并保温相应的时间，使之熔化、流平、固化，从而得到我们想要的工件表面效果。

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.

工艺步骤： 将喷涂好的工件推入固化炉，加热到预定的温度（一般185度），并保温相应的时间（15分钟）；开炉取出冷却即得到成品。

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.

提示：加热及控制系统（包括电加热、燃油、燃气、燃煤等各种加热方式）+保温箱体=固化炉。

Tip: heating and control system (including electric heating, oil, gas, coal and other heating methods) + insulation box = curing furnace.

4、装饰处理：

4. Decoration treatment:

目的：静电喷涂后的工件在外观上有一种特殊效果，如：各种木纹、花纹、增光等。

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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