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Spraying
What’s Spraying?
Spray coating is a technique that uses high-pressure spraying to create a uniform coating on a product’s surface. It’s suitable for plastics and metals, enhancing both aesthetics and protective properties. The principle of the spray coating process is to evenly coat the product surface with paint using a high-pressure jet, creating the desired coating.
The different types of coatings and process parameters directly impact the final result. During the spraying process, careful control of the distance, angle, and speed of the spray gun is crucial to ensure uniformity and consistency. Selecting the appropriate coating and process parameters is also crucial, as they directly determine the final appearance and quality of the product.
Spraying Finish Products
Types of Spraying
Spray Type |
Process Principle |
Material Form |
Key Characteristics |
| Paint Spraying | Atomizes liquid paint through a spray gun onto surfaces | Liquid paint (solvent/water-based) | Adjustable colors, requires drying/curing, potential VOC emissions |
| Powder Coating | Electrostatic adsorption of dry powder followed by high-temperature curing | Dry powder (epoxy/polyester) | Solvent-free, eco-friendly, high utilization (>95%), thick coating (50-150μm) |
| Thermal Spraying | Melts metal/ceramic materials (flame/plasma/arc) and sprays at high velocity | Metal/ceramic powder/wire | Ultra-thick coatings (0.1-10mm), extreme wear/corrosion resistance |
| Thermoplastic Spraying | Heats and sprays molten plastics (e.g., polyethylene, polyurethane) that cool to solidify | Thermoplastic pellets | Chemical resistance, flexibility, suitable for irregular surfaces |
| Ultrasonic Spraying | Uses ultrasonic vibration to atomize liquids into micron-sized particles for even coating | Nano-coatings/functional liquids | Ultra-thin coatings (nanoscale), precise control, clog-free nozzles |
FAQ Of Spraying
Visit our FAQ center for more questions.
What are the main applications for injection mold spraying?
- Demolding spraying: Helps plastic parts release smoothly from the mold, reducing the risk of sticking.
- Rust/corrosion protection: Protects mold steel from moisture and chemical corrosion.
- Texturing spraying (etching): Creates special effects such as leather grain and matte finishes on the mold surface.
- Repair spraying: Repairs worn or scratched mold surfaces (e.g., laser cladding, thermal spraying).
How to avoid surface defects when spraying the release agent?
- Control the spray volume (apply a thin, even layer).
- Use a release agent that evaporates quickly and leaves little residue (such as a water-based or silicone-based agent).
- Adjust the spray distance (usually 20-30 cm) and air pressure (avoid excessive pressure that can cause splashing).
What are some common spraying equipment?
- Manual spray guns: Suitable for small-batch or localized spraying (e.g., mold release agents).
- Automatic spray robots: Suitable for high-precision, high-volume production (e.g., automotive mold coating).
- Electrostatic spray equipment: Improves paint adhesion and reduces waste.
- Ultrasonic atomization spraying: Uniformly applies fine particles (suitable for high-precision mold release agents).