Sanitary Cone Mill, Doebritz Industrial Mills, FDA Compliant / CIP Optional

Product Summary

The Doebritz Sanitary Cone Mill sets a new standard for gentle deagglomeration and precise particle size reduction in hygienic applications. Engineered specifically for pharmaceutical, food, dairy, and cosmetic industries, this mill achieves throughput rates from 5 kg/h up to 2,000 kg/h depending on mesh and product density. The unit meets strict FDA and cGMP guidelines, featuring a crevice-free 316L stainless steel contact surface, Ra ≤ 0.4µm mirror polish. For potentially explosive environments (NFPA/ATEX Zone 0 or 1), an ATEX certified explosion-proof motor with static grounding kit is available. Ideal for dry or wet milling of paracetamol, lactose, infant formula, spices, coffee, and frozen blocks.

Why Source Doebritz Sanitary Cone Mills

• Localized OEM Stock & 48h Rapid Dispatch: Doebritz maintains ISO Class 7 clean assembly rooms in Houston & Rotterdam. Standard models in SS316L are ready for shipment within 48 hours for urgent line integration.
• Superior Yield & Temperature Control: Unique cantilevered rotor and tight clearance (0.3mm to 2.5mm) produce uniform granules with < 3℃ temperature rise, preserving heat-sensitive APIs and flavors.
• Tool-Free Sieve Change & Wash-in-Place: Integrated CIP spray nozzles and quick-lock sieve clamp reduce downtime to under 5 minutes per batch changeover, validated by 3.2 bar water pressure.
• 24/7 Technical Support & Validation Docs: All Doebritz mills ship with full IQ/OQ protocol, material certs 3.1, and remote PLC diagnostics via Modbus TCP/IP.

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Housing & Rotor Engineering

Unlike cast cone mills, the Doebritz housing is fabricated from single-piece deep-drawn 316L stainless steel (no welds or crevices). The geometry features a dual-cone hopper section to prevent bridging of sticky APIs, transitioning into a precision dual-impeller rotor. Rotor blades are CNC-machined from solid 2205 duplex stainless steel with a gentle wedge profile that pushes product radially outward. Combined with a fixed mill screen (round, square or rasping hole patterns), the design creates an optimal low-turbulence vestibule for friable materials. Outboard bearing housing isolates grease and particulates, while a double-acting silicon carbide seal maintains 0.1% dust leakage.

Technical Specifications

All Doebritz Sanitary Cone Mills are engineered for validated performance. Refer to the table below for standard dimensions. High-capacity custom designs up to 10,000 kg/h are available upon request (lead time +15 days).

Specification	Detail
Model	Doebritz SCM-300, SCM-600, SCM-900
Contact Material	AISI 316L Stainless Steel (EN 1.4404), Ra < 0.4µm
Rotor Design	2-blade or 4-blade wedge impeller, CNC Duplex SS
Screen Perforations	0.5mm, 0.8mm, 1.0mm, 1.5mm, 2.0mm, 3.0mm (round/hole/rasp)
Motor Power	0.75 kW to 7.5 kW, 230/400V or 480V 60Hz
Speed Range	500 – 3000 RPM (VFD controlled)
Seal Type	Silicone carbide double mechanical / PTFE lip / Split-lip extraction
Operating Pressure	-1 barg to +3 barg (vacuum to pressure shock resistant)
Operating Temperature	-30°C to +150°C (with jacket option)
Certifications	FDA, cGMP, EHEDG, ATEX II 2 D c T4 / II 2 G Ex h IIB T4

Heavy-Duty Application Scenarios

Pharmaceutical API Milling & Tablet Pre-compression

Doebritz mills gently break down agglomerated API crystals without altering polymorphic form. The closed system connects directly to a glovebox isolator for potent compound handling up to OEB 5 (≤ 1 µg/m³ containment). A low-RPM rotor (< 1500 RPM) plus 0.5mm screen yields narrow particle size distribution (D90 = 150µm) required for direct compression tableting.

Food Powder Re-granulation & Baby Formula Deagglomeration

For infant formula production lines (e.g., after spray drying), the Doebritz cone mill removes hard lumps and ensures free-flowing powder without crushing the porous particles. Fully CIP-able design meets EHEDG guidelines. Option of a nitrogen purge for fatty products (e.g., whole milk powder) eliminates combustion risk.

Semi-solid & Frozen Product Milling

With a jacketed housing for coolant (glycol or chilled water), the Doebritz sanitary cone mill processes frozen blocks of fruit puree, meat slurries, or suppository mass directly from freezer (-20°C). Special hardened rotors shred and mill frozen payload into pumpable paste for subsequent mixing or extrusion.

Frequently Asked Questions

Q1: Can Doebritz customize the inlet/outlet sanitary ferrule size and angle for my existing powder transfer system?

A: Yes. Our 15 years of OEM integration experience allow full custom ferrules (DIN 32676, Tri-clamp, RJT, IDF) from 2 inch to 8 inch. We also provide custom hopper angles (45°, 60°, 70°) to match your upstream gravimetric feeder. CAD drawing and 3D scan integration service available.

Q2: What is the lead time for a Doebritz Sanitary Cone Mill with ATEX Zone 1 certification and 3A sanitary compliance?

A: Standard mill non-certified: 2 weeks. For ATEX II 2 GD (gas/dust) with full documentation pack: 8 workdays for assembly + 5 days for certified verification, total 3-4 weeks. 3A certification adds 2 weeks for inspection. Urgent express (25% surcharge) cuts total to 10 days.

Q3: How do you guarantee NO metal-to-metal contact between rotor and screen during high-speed operation?

A: Doebritz employs a proprietary eccentric bearing housing adjustment system. Before final assembly, we set precise axial and radial gap (0.2mm nominal) using laser micrometers. A soft-start VFD prevents torque shock. For safety, we offer optional sieve sense (proximity switch) that halts motor if screen deflects > 0.1mm.

Q4: Does the Doebritz mill support NIST-traceable temperature mapping validation for heat-sensitive product compliance?

A: Absolutely. Our machine housing includes pre-drilled thermowell ports (0.25 NPT) for inserting RTD sensors. During FAT, Doebritz performs a 6-point temperature mapping validation using continuous data logging across defined RPM and feed rates. A final signed validation package (including temperature rise < 3°C) is delivered with each unit.

Q5: What sealing technologies are available for preventing leakage of sub-micron dust when milling potent APIs?

A: Standard configuration uses PTFE lip seal. For high containment (OEB 4 / 5), Doebritz offers a split-lip cartridge seal with active dust extraction (vacuum 100 mbar) or a double mechanical seal with barrier fluid pressure monitoring. All seals are FDA compliant and changeable from the drive side without complete disassembly.