Food Grade SS304 Vertical Ribbon Mixer, Doebritz Industrial Blender, 10-5000L Capacity / CIP Hygienic Design

Product Summary

Doebritz presents the Food Grade SS304 Vertical Ribbon Mixer – a high-precision blending solution for dry powders, granules, and flaky materials. Engineered with CNC-machined SS304 ribbons and a double-ribbon helical profile, it achieves 99.5% mixing uniformity within 3–8 minutes. Capacities range from 10L to 5,000L, with optional ATEX 22 internal explosion-proof configuration and CIP spray nozzle package. The vertical taper body ensures gravity-assisted discharge with minimal residual (<0.1%). Built for 24/7 sanitary production lines, this mixer meets FDA 21 CFR and EC 1935/2004 standards.

Why Source Doebritz Vertical Ribbon Mixers

• Ultra-low cross-contamination risk: Full stainless steel contact parts, mirror-polished inside (Ra ≤ 0.4µm), no dead corners. Sanitary clamp connections for quick disassembly.
• Longer seal & bearing life: Outboard bearings with triple-lip air purge seals prevent dust ingress – MTBF > 25,000 hours in flour & spice plants.
• OEM-friendly modifications: Custom inlet/outlet flanges (DIN/ANSI/JIS), added lump breakers, liquid injection bars, or heating/cooling jackets. Lead time 25–35 working days for non-standard units.
• ATEX certified explosion-proof option: Zone 22 internal anti-spark ribbon coating, earthing bridges, and IE3 motor with PTC thermistors. Full documentation pack for EU/NA compliance.
• Global OEM supply capability: Doebritz delivers to +45 countries with CE, UKCA, EAC, and CRN certification. Container-ready packing + optional wooden export cases.

Housing & Rotor Engineering

The mixer housing is fabricated from single-piece SS304 with 3mm nominal thickness, seam-welded by robotic orbital TIG for full penetration without carbide precipitation. The vertical conical design incorporates a reinforced bridge breaker above the discharge valve to prevent arching in cohesive powders. The ribbon assembly consists of an inner right-hand spiral (transport) and outer left-hand spiral (return), made from CNC-bent solid SS304 bar. Clearance between ribbon and wall is 3–5mm adjustable to handle fine sugar (150μm) up to coarse grains (5mm). Shaft ends are fitted with SKF food-grade grease-lubricated bearings, isolated by air-purged double lip seals – tested to < 0.5mbar pressure loss at 0.6bar differential. Top cover includes 150mm sight glass with LED light and 300mm manhole for CIP verification.

Technical Specifications

All Doebritz Vertical Ribbon Mixers are hydraulically and thermally rated for continuous industrial service. Standard testing includes 30-minute dry-run vibration check (< ISO 2.5) and 24-hour water-jacket performance test for heating/cooling variants.

Specification	Detail
Body Material	SS304 (AISI 304), 2B finish inside + 2D outside
Rotor Design	Inner + outer continuous ribbon, SS304, adjustable wall clearance 3mm-5mm
Capacity Range	10 / 30 / 100 / 250 / 500 / 1000 / 2000 / 3000 / 5000 L
Mixing Uniformity (CV)	≤ 5% after 4-8 minutes (tested with 1% salt in flour)
Max Differential Pressure	0.6 bar(g) standard; 1.0 bar(g) with air purge option
Temperature Range	-10°C to +80°C (NBR seals); -10°C to +200°C (Viton seals)
Surface Finish (contact)	Ra ≤ 0.4µm (mechanically polished), sanitary welds
Drive Motor	IE3, 380-415V / 50Hz, IP55, F-class insulation; optional IE4/ATEX
Discharge Valve	Doebritz DN150-300 manual or pneumatic butterfly valve (SS304)
Certifications	CE, FDA 21 CFR, EC 1935/2004, ATEX II 2D on request

Heavy-Duty Application Scenarios

Pneumatic Conveying Systems

Integrated directly below a day bin or loss-in-weight feeder, the Doebritz SS304 Vertical Ribbon Mixer provides homogeneous blending before pneumatic transfer to packing or silos. The bottom outlet can be equipped with a Doebritz butterfly valve or rotary airlock to maintain pressure seal up to 1.0 bar(g), preventing blowback into the mixer.

Silo Discharging & Pre-blending

Ideal for multi-ingredient batching lines (e.g., bakery premixes, protein powders). Installed on load cells, the mixer acts as both batch accumulator and blender, reducing system height. The steep 60° cone angle ensures mass flow discharge without bridging.

Dust Filter Collectors Return Blending

For plants recovering dust from baghouse filters, the vertical orientation allows direct flange connection to a rotary valve under the filter hopper. Reclaimed fines are re-mixed with virgin material in the same vessel, ensuring consistent particle size distribution.

Frequently Asked Questions

Q1: What is the minimum batch size for your SS304 Vertical Ribbon Mixer?

A: Doebritz mixers operate efficiently from 30% to 100% of nominal volume. For a 500L model, min batch is 150L. For smaller R&D batches, we offer a dedicated 10L and 30L lab series with identical geometry for scale-up.

Q2: Can you customize inlet/outlet flanges for an existing pneumatic line?

Yes. Doebritz supports DIN, ANSI 150#, JIS 10K, or customer-specific drilling patterns. Include your flange drawing with PO, and we deliver pre-welded stub ends ready for clamp or bolt-up. Non-standard flanges add 5–7 days to lead time.

Q3: Do you provide ATEX Zone 22 certification for explosive dusts (e.g., sugar, flour)?

Absolutely. Our ATEX-certified option includes conductive PTFE ribbon coating, earthing continuity across all components, IP66 junction box, and a nameplate with CE 0081 marking. We supply a full EX technical file for EU notified body submission.

Q4: What high-temperature configurations are available?

Standard seals are NBR for -10°C to +80°C. For hot mixing (>120°C fat coating or dried fruits), specify Viton seals (+200°C) and high-temp grease. For cooling applications (<0°C), add a jacket with ethylene glycol connection and low-carbon 304L to avoid embrittlement.

Q5: What is your typical lead time, and how is the mixer shipped?

Standard units (100–2000L) ship in 15–20 working days after deposit approval. Larger mixers (3000–5000L) require 25–30 days. All units are wrapped in anti-moisture VCI film and bolted to a fumigated plywood skid – FOB Shanghai or CIF any major port via LCL/40′HC container. We provide 3D lifting drawing before dispatch.