Pharmaceutical Cone Mill, Doebritz Industrial Milling, Stainless Steel 316L / FDA Compliant

Product Summary

Doebritz introduces its advanced Pharmaceutical Cone Mill, engineered for precise deagglomeration, lump breaking, and sizing of dry and wet pharmaceutical powders, granules, and crystalline materials. This gravity-fed or vacuum-assisted mill delivers output capacities from 50 kg/h to 4,500 kg/h while maintaining strict OEB 3 to OEB 5 containment levels. The unit features a Stainless Steel 316L contact part, Ra ≤0.4µm mirror polish, and is fully ATEX certified for dust explosion-proof environments (II 2 D c T120°C). Ideal for high-containment API processing and sterile milling lines.

Why Source Doebritz Pharmaceutical Cone Mill

• Containment & Compliance: FDA 21 CFR Part 11 ready, cGMP validated design with wash-in-place (WIP) nozzles for rapid changeover.
• Minimal Heat & Dust Generation: Low-RPM rotor (300 – 1500 RPM) and precision gap settings (0.5 – 5 mm) prevent product degradation and air leakage < 0.3 m3/h under differential pressure.
• Interchangeable Tooling: Round, square, or rasping impellers with screens from 0.5 mm to 10 mm (perforated, grated, wire mesh).
• Ultraclean Surface Finish: Electropolished internal welds and crevice-free construction for bacteria-free milling.
• Global OEM Supply: Direct supply with 4-week lead time for standard units, 8 weeks for full ATEX/SIL-2 customized versions.

Housing & Rotor Engineering

The Doebritz Cone Mill housing is precision cast from SS316L with CNC-machined mounting faces for zero-misalignment assembly. The cone-shaped stator features a unique spiral wedge-groove design that gradually reduces particle size as material advances from the inlet to the outlet. Rotor blades are fabricated from solid nitrided stainless steel (HV 950) and dynamically balanced to G 6.3. The double mechanical seal with nitrogen purge prevents any product leakage into the bearing housing. An optional air-purged labyrinth seal allows operation under vacuum up to -0.9 bar gauge. All elastomers are FDA-grade silicone or PTFE, with Viton available for solvent-handling applications.

Technical Specifications

Each Doebritz Pharmaceutical Cone Mill undergoes a 20-point factory acceptance test (FAT) including noise, vibration, surface roughness, and pressure decay tests. Below are the standard parameters for the DCM-400 model (others from DCM-150 to DCM-800 available).

Specification	Detail
Body Material	SS316L (1.4404) / Ra ≤0.4µm electropolished
Contact Parts	SS316L, FDA grade silicone / PTFE seals
Rotor Design	2-blade or 4-blade edge mill, nitrided HV 950
Screen Size Range	Perforated 0.5mm – 10mm, Grating 1.5mm – 8mm
Motor Power	2.2 kW to 7.5 kW, 230/400V, 50/60Hz, IP55
Rotor Speed	Variable 300 – 1500 RPM (via inverter)
Maximum Capacity	4,500 kg/h (dry granule) / 2,000 kg/h (wet mass)
Operating Temp.	-20°C to +150°C (optional cryogenic -50°C)
ATEX Marking	II 2 D c T120°C, optional II 2 G c T4

Heavy-Duty Application Scenarios

High-Containment API Milling (OEB 5)

Paired with a split butterfly valve and continuous liner system, the Doebritz Cone Mill enables ≤1 µg/m3 operator exposure for potent compounds. The sealed cone design eliminates dust escape during tablet compression feed preparation.

Sterile Wet Granulation Milling

Integrated into fluid bed dryer lines, the mill eliminates lumps from wet mass without excessive fines. WIP nozzles and a fully drainable chamber allow sterilization with SIP (Steam-in-Place) at 140°C.

Continuous Dry Powder Deagglomeration

Before pneumatic conveying into a bin blender or tablet press, the Doebritz cone mill breaks agglomerates of lactose, MCC, and starch at rates up to 6,000 kg/h, ensuring uniform bulk density.

Frequently Asked Questions

Do you offer custom inlet/outlet flanges and support for non-standard hoppers?

Yes, Doebritz provides full custom flange machining (DIN, SMS, Tri-Clamp, or customer drawings) with no MOQ. The housing can be offset to match existing lines. Lead time for non-standard flanges adds only 5 working days.

What ATEX certifications are available, and do you provide the declaration?

All Doebritz Cone Mills are certified ATEX II 2 D c T120°C (dust) and optional II 2 G c T4 (gas). We supply the EC-type examination certificate (Notified Body) and an installation guide for safe use in Zone 1/21 environments.

Can the mill run at cryogenic temperatures for soft or gummy materials?

Absolutely. Our cryogenic version features liquid nitrogen injection ports on the infeed housing, double PTFE purge seals, and a special rotor with extended clearance to prevent freezing. Operating temperature down to -50°C is achievable.

What is the spare parts availability and typical lead time for emergency orders?

We stock complete rotor assemblies, screens, and seal kits for all models at our EU and US warehouses. Emergency spare parts are shipped within 24 hours (DHL/FedEx Priority). We also offer a 24/48-hour rotor exchange service for critical lines.

How do you validate cleaning for highly potent GMP batches?

Every mill ships with a validation protocol including a certificate of surface roughness (Ra values), visual inspection for weld polish, and a residual swab test sample (for ATP or product-specific analysis). We support Nuclepore filter rinsing method for containment validation.