Conical Twin Screw Mixer (Nauta Mixer): Specifications & Price Guide 2026 | POLYC
Conical Twin Screw Mixer (Nauta Mixer): Specifications & Price Guide 2026
Industrial vertical conical twin-screw blenders (100L to 15,000L+) for gentle, low-shear powder homogenization — cantilever screw design, zero bottom bearing contamination, minimal electrical power draw, and direct factory pricing.
In large-scale bulk solids blending, plant layout constraints and thermal sensitivity create a major operational barrier: "How do process engineers homogenize large batches (1,000L to 15,000L+) of heat-sensitive, fragile, or abrasive powders without occupying excessive factory floor space, generating high frictional motor heat, or risking grease contamination from submerged bottom bearings?" While horizontal Ribbon Blenders demand wide horizontal footprints and high motor kilowatts to move an entire bed simultaneously, the Conical Twin Screw Mixer (DSH Series / Nauta Mixer) utilizes the vertical plane to achieve gentle, high-efficiency blending.
Operating on a dual-motion principle, the Nauta mixer combines the axial rotation of two asymmetrical screws with the revolving orbital sweep of a rotating cantilever arm. The screws lift materials continuously from the narrow bottom apex to the surface, where they cascade back into the center under gravity. Operating with over 99% homogeneity ($CV \le 1.5\%$) at a fraction of horizontal blender power, POLYC conical mixers feature a specialized cantilever hanging screw design with zero bottom bearings, eliminating powder packing and mechanical seal leaks. This guide covers four primary capacity classes — Pilot & Small Batch Units (100L–500L), Commercial Production Mixers (1,000L–3,000L), Heavy High-Capacity Systems (4,000L–8,000L), and Continuous High-Tonnage Bulk Plants (10,000L–15,000L+) — to assist production directors in sizing screw configurations, liquid injection manifolds, and automated loading systems alongside our Pneumatic Vacuum Feeders.
POLYC has engineered over 600 conical twin screw mixers worldwide for synthetic dye synthesis, instant beverage premixes, agrochemical wettable powders (WP), and technical battery ceramics.
POLYC Conical Twin Screw Mixer: Inverted Vertical Cone, Cantilever Planetary Drive Head, Top Access Manway, and Sanitary Spherical Bottom Discharge Valve.
Conical Twin Screw Mixer Specifications & Working Capacities
| Model Series & Class | Total Vessel Volume | Working Load (30–70%) | Screw & Orbital Drive Power | Cantilever & Bottom Design | Relative Investment Tier |
|---|---|---|---|---|---|
| 1. Pilot & Small Batch (DSH-100 / DSH-500) | 100L – 500L | 30L – 350L (20 – 250 kg/batch) |
1.5 kW – 3.0 kW; Screw: 60–80 rpm; Orbital arm: 2.0 rpm; Low energy footprint | Full cantilever design; Zero bottom bearing; Manual sanitary spherical flush valve | Entry Commercial Tier |
| 2. Commercial Production (DSH-1000 / DSH-3000) | 1,000L – 3,000L | 300L – 2,100L (200 – 1,500 kg/batch) |
4.0 kW – 7.5 kW; Cycloidal pinwheel + planetary bevel gearbox; VFD variable speed | Asymmetrical dual screws (long + short); Pneumatic plum-blossom or spherical valve | Core Production Tier |
| 3. Heavy High-Capacity (DSH-4000 / DSH-8000) | 4,000L – 8,000L | 1,200L – 5,600L (800 – 4,000 kg/batch) |
11.0 kW – 18.5 kW; High-torque helical-bevel planetary head; Optional internal liquid spray | Reinforced cantilever hanging screws with anti-sway apex guide; Dimple thermal jacket | Large Batch Tier |
| 4. Industrial Bulk Tonnage (DSH-10000 / DSH-15000+) | 10,000L – 15,000L+ | 3,000L – 10,500L+ (2,500 – 8,000+ kg) |
22.0 kW – 37.0 kW; Heavy dual-motor drive (independent screw and revolution motors) | Heavy structural mezzanine mount; Bottom slide gate with automated batching load cells | High-Tonnage Plant Tier |
*Note: Nauta mixers support flexible working fill levels ranging from 30% to 70% of total vessel volume without losing mixing efficiency. Batch capacity depends on powder bulk density ($0.3\text{--}1.8\,\text{g/cm}^3$). All contact parts are available in SUS304 or mirror-polished SUS316L ($Ra \le 0.4\,\mu\text{m}$) with full cGMP qualification packages.
How to Select Your Conical Twin Screw Mixer Configuration
Determine your conical twin screw specification based on thermal sensitivity, batch density variance, floor space availability, and sanitization requirements:
Scenario A: Synthetic Dyes, Pigments & Color Toning
Process Profile: Blending micro-dosed pigment shading additives into large master batches without friction streaks or localized overheating.
Optimal Configuration: Standard DSH Conical Twin Screw Mixer with asymmetrical flight pitches. Gentle vertical lifting prevents thermal melting of sensitive organic pigments, ensuring rapid distribution of trace colorants across large volumes with zero shear friction.
Scenario B: Instant Beverages, Milk Powders & Flavored Spices
Process Profile: Uniformly blending spray-dried dairy powders, crystal sugars, and aroma oils without particle attrition.
Optimal Configuration: Full sanitary SUS316L mirror-polished construction ($Ra \le 0.4\,\mu\text{m}$) fitted with an internal liquid spray atomization lance through the central orbital hub. Low-speed screw lifting prevents hollow fat agglomerate fracture, while spray nozzles distribute liquid flavor oils evenly without creating wet lumps.
Scenario C: Pharmaceutical Excipients, Antibiotics & OSD Granules
Process Profile: Strict cleanroom validation requiring zero batch-to-batch cross-contamination and zero risk of lubricant leaks.
Optimal Configuration: Cantilever Twin Screw Mixer with Zero Bottom Bearing. The screws suspend freely from the top planetary drive, eliminating submerged seals. A precision sanitary spherical valve at the cone apex delivers 100% complete gravitational discharge with CIP spray balls for rapid validation washdown.
Scenario D: Agrochemical Wettable Powders (WP) & Technical Minerals
Process Profile: Blending abrasive kaolin or silica carriers with crystalline active pesticides and surfactants in large batches (5,000L+).
Optimal Configuration: Heavy-gauge SUS304 vessel with tungsten carbide or hard-chrome coated screw flights. High vertical capacity occupies minimal floor area, while low rotational speeds ($60\,\text{rpm}$) prevent abrasive vessel wall scouring, extending operational lifespan.
Associated Dry Powder Mixing & Bulk Handling Ecosystem
Conical Screw Mixer
Cantilever vertical screws for gentle large-batch powder homogenization.
Pharma APIs & Excipients
Zero bottom bearing design guarantees sanitary cGMP batch integrity.
Seasonings & Drinks
Low-energy lifting preserves fragile instant crystals and aroma compounds.
Polymer Masterbatches
Large-tonnage vertical mixing for resin pellets, flame retardants, and dyes.
Engineering Architecture: Planetary Kinematics, Cantilever Design & Discharge
1. Three-Dimensional Planetary Kinematics & Gentle Convective Flow
The Nauta mixing mechanism operates via three simultaneous, complementary physical motions inside an inverted conical vessel:
• Screw Axial Rotation: The two asymmetrical mixing screws rotate on their own longitudinal axes at $60\text{--}80\,\text{rpm}$, conveying powder upward from the narrow bottom apex to the upper surface.
• Orbital Arm Revolution: A revolving horizontal arm orbits the central axis of the vessel at $1.5\text{--}3\,\text{rpm}$, sweeping the rotating screws along the full circumference of the conical inner wall.
• Gravitational Central Cascade: Material carried to the upper surface continuously spills over and cascades downward through the core of the cone by gravity, inter-tumbling with newly lifted material.
This three-dimensional flow cycle ensures complete batch homogenization within 10 to 15 minutes with zero high-speed mechanical impact.
2. Cantilever Hanging Screw Architecture: Zero Bottom Bearing Contamination
In traditional vertical mixers, bottom guide bearings submerged in the product bed inevitably suffer from powder ingress, bearing seizure, and grease leakage into the batch.
POLYC utilizes an advanced Cantilever Hanging Screw Design. Both mixing screws are rigidly supported from the heavy-duty top planetary gearbox, suspending freely into the cone without any bottom bearing or shaft penetration at the discharge apex. This structural innovation eliminates mechanical friction wear, eliminates cross-batch contamination risks, and allows the mixer to handle abrasive or corrosive powders with zero seal maintenance.
3. Ultra-Low Power Consumption: 50% to 70% Energy Reduction
In horizontal ribbon or paddle mixers, the drive motor must overcome the static shear resistance of the entire powder mass simultaneously, requiring massive motors ($30\text{--}55\,\text{kW}$ for a 3,000L batch).
In a conical twin screw mixer, the screws only lift a localized stream representing approximately 10% to 15% of the total batch volume at any single instant. For example, a 3,000L POLYC Nauta mixer requires only a 7.5 kW motor — consuming less than one-third the electricity of an equivalent horizontal blender. This minimal energy input prevents frictional heat generation, keeping processing temperatures virtually ambient for thermal-sensitive waxes, resins, and active pharmaceutical ingredients.
4. Steep $60^\circ$ Cone Geometry & Sanitary Spherical Discharge
Discharging sticky or fine powders cleanly from horizontal troughs requires manual scraping, air lances, or high heel waste.
The Nauta mixer features a continuous $60^\circ$ conical wall slope that exceeds the angle of repose for dry powders. At the bottom apex, POLYC integrates a sanitary pneumatic spherical valve or flush-fitting plum-blossom disc valve. When opened, gravity forces material downward into downstream packaging hoppers with near-zero residue ($< 0.2\%$). Internal mirror polishing ($Ra \le 0.4\,\mu\text{m}$) allows quick visual inspection and simple clean-in-place (CIP) spray-ball sanitization.
What Factors Drive the Price of a Conical Twin Screw Mixer?
When evaluating commercial equipment proposals for industrial Nauta mixers, total capital investment reflects four primary engineering specifications:
1. Vessel Capacity & Planetary Gearbox Torque
Pricing scales directly with cone volume — from compact 100L/500L pilot units up to 10,000L to 15,000L+ high-tonnage industrial systems. Larger models require massive forged planetary transmission heads, high-torque cycloidal reducers, and heavy structural mounting skirts engineered to withstand dynamic cantilever bending moments.
2. Cantilever Structure vs. Bottom Guide Bushings
Basic industrial mixers occasionally incorporate bottom pin bushings to reduce top transmission sizing. Upgrading to a 100% Full Cantilever Free-Hanging Design requires precision-machined heavy-duty top thrust bearing blocks and thicker hollow screw core shafts, increasing initial engineering investment while eliminating maintenance downtime.
3. Contact Metallurgy & Sanitary Surface Polishing ($Ra$)
Standard industrial SUS304 represents the baseline for chemical fertilizers and plastic resins. Upgrading to pharmaceutical-grade SUS316L with sanitary electro-chemical mirror polishing ($Ra \le 0.2\,\mu\text{m}$) on both screws and conical inner walls adds to specialized cleanroom fabrication costs.
4. Thermal Jacket, Liquid Spray & ATEX Protection
Customizations — including dimple cooling/heating jackets for drying, internal pressurized liquid atomization spray manifolds through the orbital shaft, ATEX Zone 21/22 flameproof motor packages, and automated loss-in-weight load cells — dictate total turnkey project investment.
Why Choose POLYC for Conical Twin Screw Mixers?
CNC cone plate rolling, cantilever screw dynamic balancing, and full-load orbital tests at POLYC's 9,000 m² Wuxi manufacturing plant.
🏭 Real Direct Factory Manufacturing & Turnkey Powder Engineering
Shanghai Polyc Technology Co., Ltd. builds all DSH-series conical twin screw mixers, structural access platforms, and pneumatic discharge assemblies inside our wholly-owned 9,000 m² production workshop in Wuxi, Jiangsu Province. Sourcing directly eliminates intermediary agent markups, connects your chemical engineers directly with machine designers, and ensures strict ISO9001 and CE compliance.
🤝 3-Year Global Warranty & Priority Air-Express Parts
All genuine POLYC Nauta mixers include our standard 3-Year Global Warranty covering the conical vessel, cantilever orbital arm, planetary transmission gearbox, and electric drive motors. We stock replacement sanitary spherical valve seals, planetary gears, and drive chains for priority international air-express dispatch within 3 to 5 business days.
🧪 Free Material Blending Trials & Blend Uniformity ($CV$) Analysis
Unsure of the optimal screw rotational speed, cycle time, or whether liquid spray injection is required for your dry powder formulation? Send a 20L to 50L bulk sample to our Wuxi pilot testing laboratory. Our chemical engineers will run trials on our pilot DSH mixers, providing complete blend uniformity ($CV$) and particle size distribution (PSD) reports before finalizing equipment sizing.
Ready to Specify Your Conical Twin Screw Mixer?
Share your bulk solids properties (bulk density, particle size, flowability, moisture content), target batch volume (liters or kg), and factory ceiling height with our Wuxi engineering desk — we will deliver an optimized 3D layout, P&ID, and direct factory quote within 24 hours.
Frequently Asked Questions
How does a Conical Twin Screw Mixer (Nauta Mixer) achieve gentle, low-shear mixing?
Why is the Cantilever (zero bottom bearing) design so critical?
How does a Conical Screw Mixer compare to a Horizontal Ribbon Blender?
What is the acceptable working fill range of a Nauta mixer?
Can liquid ingredients be added during the dry mixing cycle?
What engineering factors determine the quotation of a Conical Twin Screw Mixer?
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