Fine Chemical SS316L Vertical Paddle Mixer, Doebritz Industrial Mixer, 304 Stainless Steel / Sanitary Design

Product Summary

Doebritz presents the Fine Chemical SS316L Vertical Paddle Mixer – a heavy-duty industrial blender engineered for ultra-pure powder, granular, and flake materials. With a working capacity ranging from 0.5 to 20 m³ per batch, this unit achieves ≤0.01% residual discharge rate thanks to its precision-machined paddle-to-housing clearance (≤0.5mm). Built to withstand explosion-proof zones, the entire drive train is ATEX 22 II 2 D certified, and all contact parts are electro-polished SS316L (Ra ≤0.4µm). Ideal for APIs, lithium battery precursors, and pigment homogenization.

Why Source Doebritz Fine Chemical SS316L Vertical Paddle Mixer

• Superior Alloy & Finish: Full SS316L construction with pickling and electro-polishing, eliminating cross-contamination risks in batch-changeover.
• Zero-Leakage Shaft Sealing: Doebritz‘s exclusive double mechanical seal + gas barrier system guarantees <10 ppm air leakage, even under -0.95 bar vacuum drying.
• Global OEM Supply Chain: All flanges are CNC-drilled to EN 1092-1 or ASME B16.5 standards, ready for direct integration into your existing pneumatic conveying or gravimetric feeding system.
• 10-Year Structural Warranty: Finite element analysis (FEA) validated housing and oversized outboard bearings ensure continuous duty at 80% fill level, no shaft deflection.

Housing & Rotor Engineering

The mono-welded trough features a `U`-shape profile with dished ends, pressure-rated for 3 bar(g) and full vacuum. The paddle shaft is stress-relieved 316L stainless steel with adjustable, bolted paddle blades. Doebritz‘s patented helical overlapping paddle arrangement creates a dual mixing action: radial convection plus axial pushing, achieving a CV (coefficient of variation) ≤5% in 3 minutes. All shaft penetrations use a proprietary air-purged labyrinth seal, preventing dust escape into the gearbox.

Drive & Safety Integration

A heavy-duty helical gear motor (Siemens/SEW/NORD) is mounted with a torque-limiting coupling. All mixers undergo a 2-hour full-load heat-run test. For ATEX environments, we install a PT100 bearing temperature sensor + vibration monitor with 4-20mA output to your DCS.

Technical Specifications

All Doebritz vertical paddle mixers are manufactured under ISO 9001:2025 and follow strict GMP hygiene guidelines for fine chemical and pharmaceutical applications. Below are standard parameters; ask our engineers about ‘Doebritz Customized‘ options for non-stick coatings (PTFE, Halar) and explosion-proof inerting ports.

Specification	Detail
Body Material	SS316L (AISI 316L), electro-polished Ra ≤ 0.4µm
Rotor Design	Helical overlapping paddle, adjustable, bolted type (no welded-on blades)
Working Capacity	0.5 / 1.0 / 2.0 / 5.0 / 10.0 / 20.0 m³ (customizable)
Clearance (Paddle to Housing)	≤ 0.5 mm (0.02 inches), CNC machined & validated
Shaft Seal Type	Double mechanical seal with gas barrier + labyrinth purged seal
Max. Operating Temp.	-20°C to +180°C (with optional cooling/heating jacket extension)
Pressure Rating	-1 bar (full vacuum) to +3 bar(g)
ATEX Rating	II 2 D c T4 (zone 22), optional IECEx / KCs upon request
Surface Finish	Bead blasted & electro-polished, free of pits/cracks

Heavy-Duty Application Scenarios

Pharmaceutical API Blending

Gentle mixing of low-dose APIs with excipients, where metal-to-metal contact is prohibited. The SS316L finish meets FDA 21 CFR 177 and EC 1935/2004.

Lithium Battery Cathode Material

Dry homogenization of LFP, NMC, and conductive carbon black with precise temperature control via optional jacketed housing (hot water or electric trace heating).

Pigment & Toner Masterbatch

De-agglomeration of fine chemical powders with risk of dust explosion. The SS316L body can be grounded and fitted with a rupture disk, satisfying ATEX directive 2014/34/EU.

Frequently Asked Questions

What is the typical lead time for a Doebritz SS316L vertical paddle mixer?

Standard models (2-5 m³) are 8-10 weeks FOB Shanghai/Rotterdam. Custom sizes with special coatings or ATEX modifications require 12-14 weeks, including factory acceptance test witnessed by client.

Can Doebritz provide third-party material certification for SS316L?

Yes. Every casting and forged shaft includes an EN 10204 3.1 mill certificate. Upon request, our quality partner (TÜV or Bureau Veritas) can issue a 3.2 certification with full PMI and ferrite test.

Is the mixer suitable for vacuum drying after liquid addition?

Absolutely. Our standard housing withstands full vacuum (-1 bar). For vacuum drying, we add a stuffing box with PTFE chevron rings and a heated jacket to prevent condensation on the shaft.

Do you offer a clean-in-place (CIP) nozzle design?

We offer optional CIP spray bars mounted on a removable header. The paddle design ensures all surfaces (including shaft backside) are wetted. CIP verification is possible with an inserted conductivity probe and spray coverage test.

Can Doebritz integrate an explosion-proof design for Japan/Korea standards?

Yes. While base unit is ATEX certified, we can provide IECEx or KCs certification. We add a flameproof housing for the motor, anti-static bearing seals, and a grounding chain inside the discharge spout.