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We usually use various types of trash cans, and spray painted trash cans are a very common production process. Compared to traditional spray painted trash cans, spray painted trash cans have excellent characteristics.

Spray molding principle

Spray powder coating onto the surface of the work piece using electrostatic powder spraying equipment (electrostatic spray molding machine). Under the action of static electricity, the powder will uniformly adsorb onto the surface of the work piece, forming a powdery coating; The powdery coating undergoes high-temperature baking, leveling and curing, and becomes the final coating with different effects (different types of powder coatings); The spraying effect is superior to the spraying process in terms of mechanical strength, adhesion, corrosion resistance, aging resistance, etc.

Spray molding process flow

1. Pre processing:

Purpose: To remove oil, dust, and rust from the surface of the work piece, and generate a "phosphating layer" on the surface of the work piece that is corrosion-resistant and can increase the adhesion of the spray coating.

Main process steps: oil removal, rust removal, phosphating, and passivation. After pre-treatment, the workpiece not only has no oil, rust, or dust on the surface, but also generates a uniform and rough gray phosphating film on the original silver white glossy surface that is not easy to rust, which can prevent rust and increase the adhesion of the spray coating.

2. Electrostatic spraying:

Purpose: To evenly spray powder coating onto the surface of the work piece. Special work pieces (including areas prone to electrostatic shielding) should be sprayed using high-performance electrostatic spray molding machines.

Process steps: Using the principle of electrostatic adsorption, a layer of powder coating is evenly sprayed on the surface of the work piece. The fallen powder is recovered through a recycling system and can be reused after sieving.

3. High temperature curing:

Purpose: To heat the powder coating on the surface of the work piece to the specified temperature and keep it warm for the corresponding time, so as to melt, level, and cure it, thereby obtaining the desired surface effect of the work piece.

Process steps: Push the sprayed work piece into the curing furnace, heat it to the predetermined temperature (usually 185 degrees), and keep it warm for the corresponding time (15 minutes); Open the furnace and take it out for cooling to obtain the finished product.

4. Decoration treatment:

Purpose: To achieve a special appearance effect of the work piece after electrostatic spraying, such as various wood patterns, patterns, and gloss enhancement.

Process steps: Masking; Transfer printing and other processing techniques

Advantages of spray molding

1. Compared with traditional spray painting technology, electrostatic spraying technology has significant advantages, such as no need for diluents, no pollution to the environment during construction, and no toxicity to human health;

2. The coating has excellent appearance quality, strong adhesion and mechanical strength;

3. Short curing time during spraying construction;

4. The corrosion resistance and wear resistance of the coating are much higher; No primer required;