What Is the Pin Mill 630C?
The Pin Mill 630C is a dual-drive high-speed impact mill from Epic Powder Machinery, designed with input from German engineers. The “630” refers to the 630 mm grinding disc diameter, and the “C” indicates the dual-drive configuration, where both the upper and lower discs rotate in opposite directions.
In a standard single-drive pin mill, one disc rotates while the other stays fixed. The 630C drives both discs, so the relative speed between the pin arrays is the sum of both disc speeds. This gives higher impact energy and shearing force, which helps when grinding hard materials or when you need a tight particle size distribution.
How the Pin Mill 630C Works
Material enters the grinding chamber through a feeder. Inside, two counter-rotating discs, each fitted with rows of pins, create the grinding zone. As particles pass through the intermeshing pins, they are broken down by three forces:
Impact from pins rotating at linear speeds up to 240 m/s
Shearing between the opposing pin arrays
Friction and collision between particles and pin surfaces
Because the mill has no screen, material flows freely through the grinding zone. There is no screen to clog, which is useful for sticky, oily, or fibrous materials. Ground particles exit through a discharge outlet. An optional air classifier can be added to separate oversize particles and return them to the grinding zone for a narrower size distribution.
Key Features
Dual-Drive Configuation
Both discs are powered independently and can run at different speeds. Counter-rotation means the relative tip speed is the sum of both disc speeds, giving more energy input than a single-drive mill at the same motor rating.
Screenless Operation
No screen or sieve inside the grinding chamber. This removes screen blinding as a maintenance issue and allows continuous processing of sticky, oily, or fibrous materials.
Linear Speed up to 240 m/s
Pin tip speeds reach 240 m/s, producing fine and ultrafine particle sizes in a single pass. The high speed also means short residence time in the grinding zone, which limits temperature rise.
Low Heat Generation
Screenless design, short residence time, and optional cooling keep the grinding chamber temperature low. The 630C works well with heat-sensitive materials like pharmaceuticals, food ingredients, and certain polymers.
Material Options
The 630C can be built with different materials depending on the application:
316L stainless steel for pharmaceutical, food, and corrosion-sensitive uses
Tungsten alloy steel for abrasive materials where wear resistance matters
Alumina ceramic for contamination-sensitive grinding
Zirconia ceramic for high-wear and high-purity applications
Safety and Process Options
Explosion-proof design rated up to pressure shock resistance PSR11 for combustible dust environments
Nitrogen circulation to prevent oxidation, explosion, and moisture intake when processing reactive powders
Low-temperature and cryogenic grinding for materials that grind better when brittle
Pharma-grade design with high-cleanliness construction for pharmaceutical powders
Optional Air Classifier
For applications that need precise fineness control, the 630C can be equipped with an integrated air classifier. It separates oversize particles and returns them to the grinding zone, producing a narrower particle size distribution.
Applications
Battery Materials
De-agglomeration of cathode and anode powders, including LFP, NCM, graphite, silicon-carbon composites, and porous carbon. The dual-drive action breaks up pseudo-agglomerated particles without damaging the crystal structure.
Food and Pharma
Grinding and dispersion of food ingredients (starches, proteins, spices, plant powders) and pharmaceutical powders. The pharma-grade 316L stainless steel construction meets high cleanliness standards.
Chemicals and Coatings
Processing of powder coatings, pigments, dyes, and specialty chemicals. The explosion-proof design handles flammable or combustible formulations.
Minerals and Ceramics
Fine grinding and particle shaping of mineral powders, ceramic raw materials, and advanced ceramic powders. Ceramic-lined options prevent contamination in high-purity applications.
Polymer and Surface Modification
Surface coating modification of ultrafine powders with polymers or waxes. The high-speed pin action handles coating and blending in a continuous process.
Pin Mill 630C vs Single-Drive Pin Mill
| Parameter | Single-Drive Pin Mill | 630C Dual-Drive Pin Mill |
| Disc configuration | One rotary disc + one stationary disc | Two counter-rotating rotary discs |
| Relative tip speed | Up to ~120 m/s (single disc) | Up to 240 m/s (combined) |
| Energy input | Moderate | High |
| Best for | General grinding, medium fineness | Hard-to-grind materials, ultrafine dispersion, de-agglomeration |
| Particle size range | Medium to fine | Fine to ultrafine |
| Heat generation | Low | Low (short residence time offsets higher energy) |
The 630C is not a replacement for the single-drive version. It is a complement. For materials that need more grinding force or where agglomerates are hard to break, the dual-drive configuration provides the extra energy. For simpler grinding tasks, the single-drive pin mill is more cost-effective.
When to Choose the Pin Mill 630C
The 630C is a good fit when your application involves:
Powders with strong pseudo-agglomeration that single-drive mills cannot fully disperse
Materials that need particle size distribution adjustment or particle shaping
Continuous high-speed mixing and surface coating modification of ultrafine powders
Materials with high humidity, high oil content, high viscosity, or heat sensitivity
Cryogenic or low-temperature grinding
Explosive or oxidizing materials that require nitrogen circulation or PSR11-rated construction
Epic Powder
Epic Powder, 20+ years of experience in the ultrafine powder industry. Actively promote the future development of ultra-fine powder, focusing on grinding, classifying and modification process of ultra-fine powder. Contact us for a free consultation and customized solutions! Our expert team is dedicated to providing high-quality products and services to maximize the value of your powder processing. Contact us today for a free consultation and customized solutions!
Contact Us
Send us a sample and we will run a free grinding test in our lab for your material.
Website: www.epicmilling.com
Email: [email protected]
WhatsApp: +86 157 6227 2120
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— Jason Wang, Engineer