Powder Surface Coating Machine
The Powder Surface Coating Machine applies coupling agents and surface modifiers to ground mineral powders, transforming hydrophilic mineral surfaces into hydrophobic or organophilic surfaces. This surface modification is essential for producing coated calcium carbonate (for plastic, rubber, and paint applications), functional fillers, and specialty powders where the mineral must be compatible with organic polymer matrices. The coating machine uses high-speed shear mixing to ensure uniform coating agent distribution on every particle surface, dramatically improving powder dispersion, compatibility, and performance in downstream applications.
Working Principle
Ground powder and liquid or solid coating agent (stearic acid, titanate, silane coupling agents) are fed into a high-speed mixing chamber. The chamber's rotor creates intense shear and turbulence, dispersing the coating agent uniformly across all particle surfaces. Heat generated by friction melts solid coating agents or activates chemical reaction between coupling agent and particle surface. The modified powder exits the chamber with altered surface properties.
The grinding process is precisely controlled by the integrated classification system, which separates qualified fine powder from coarse particles. Coarse particles fall back to the grinding chamber for regrinding, while fine powder is conveyed by airflow to the cyclone collector and then to the finished product silo. This closed-circuit design ensures consistent product quality and high grinding efficiency.
Key Features & Advantages
Uniform Coating
High-speed shear mixing ensures every particle receives uniform coating agent coverage for consistent modification.
Versatile Coating Agents
Compatible with stearic acid, titanate, silane, and other coupling agents for different surface modification requirements.
Improved Dispersion
Coated powders disperse more easily in polymer matrices, improving downstream processing efficiency and product quality.
Integrated Heating
Friction-generated heat or external heating melts solid coupling agents, eliminating pre-melting equipment.
Applications & Industry Use
This equipment is widely used across multiple industries for various powder processing applications:
- Coated calcium carbonate for plastic
- Functional filler production
- Rubber reinforcement filler
- Paint and coating powder
- Composite material filler
Processable Materials
The versatile design of this equipment allows it to process a wide range of non-metallic minerals and industrial materials. Below are some of the most commonly processed materials. For detailed grinding solutions for each material, please visit our materials page.
Technical Specifications
The following table provides detailed technical parameters for each model in this product series. These specifications are based on standard configurations and may vary depending on material properties and specific application requirements. Contact our engineering team for customized configurations.
| Model | PSC-S | PSC-M | PSC-L |
|---|---|---|---|
| Capacity (t/h) | 0.5-2 | 2-8 | 5-20 |
| Rotor Speed (rpm) | 1000-3000 | 1000-3000 | 1000-3000 |
| Power (kW) | 7.5-15 | 15-37 | 37-75 |
Performance & Efficiency
The Powder Surface Coating Machine is designed for maximum grinding efficiency and energy savings. The optimized grinding chamber geometry, combined with high-precision classification, ensures that energy is used effectively for particle size reduction rather than wasted on over-grinding or heat generation. Compared to conventional milling systems, our equipment typically achieves 20-30% lower power consumption per ton of finished powder.
Key performance metrics include stable fineness control with deviation less than 5%, low noise levels below 75 dB at 1 meter distance, and dust emissions below 20 mg/m3 when equipped with our pulse bag filter system. These performance characteristics make our equipment suitable for even the most demanding industrial environments and stringent environmental regulations.
Installation & Commissioning
Proper installation is critical for optimal equipment performance and longevity. Our experienced engineers provide on-site installation and commissioning services, including equipment positioning, alignment, electrical connection, piping installation, and system integration. The typical installation timeline ranges from 15 to 45 days depending on equipment model and production line complexity.
During commissioning, we conduct comprehensive performance tests including no-load test, load test, and production trial runs. We verify all performance parameters meet design specifications, calibrate control systems, train your operators on proper operation and maintenance procedures, and deliver a complete commissioning report with all test data.
Frequently Asked Questions
Stearic acid is most common for calcium carbonate in plastic applications. Titanate coupling agents improve adhesion to polymers. Silane coupling agents are used for rubber and advanced composites. The choice depends on the target polymer matrix.
Typically 1-3% by weight of the powder. Stearic acid is usually 1-2%. Titanate and silane agents may be 0.5-1%. Excess coating agent causes agglomeration; insufficient coating leaves unmodified particles.
Yes. Our larger models are designed for continuous operation, integrated directly into the grinding line after the mill and before packaging. Smaller models are batch-type for smaller production volumes.