Dual Shaft Disperser & Mixer: Specifications & Price Guide 2026 | POLYC
Dual Shaft Disperser & Mixer: Specifications & Price Guide 2026
Industrial coaxial and parallel dual-shaft disperser mixers (100L to 3,000L+) for medium-to-high viscosity pastes (5,000 to 100,000 cPs) — low-speed PTFE wall-scraping anchor, high-shear Cowles disc, vacuum deaeration, and direct factory pricing.
In chemical formulation, fluid viscosities between 5,000 cPs and 100,000 cPs present a demanding processing bottleneck: "How do manufacturers disperse heavy body fillers, automotive sealants, plastisols, thick wall coatings, and structural adhesive pastes without shaft cavitation, unmixed wall buildup, localized overheating, or investing in an excessively costly planetary mixer?" A standard single-shaft high-speed disperser only shears fluid in its immediate radius, creating a stationary perimeter ring of stagnant material. Conversely, a heavy double planetary mixer delivers massive planetary torque but lacks the high peripheral tip speeds ($20\text{--}25\,\text{m/s}$) required to break fine pigment agglomerates rapidly.
The POLYC Dual Shaft Disperser & Mixer (SDM Series) bridges this viscosity gap. By integrating an independently driven outer low-speed anchor agitator ($15\text{--}45\,\text{rpm}$) equipped with hinged PTFE scrapers and an inner high-speed Cowles dispersing disc ($500\text{--}1,500\,\text{rpm}$), the machine forces continuous mass turnover. The outer frame sweeps the vessel walls to prevent thermal scorching and push viscous paste inward, while the high-speed blade disintegrates agglomerates and dissolves polymers under deep vacuum ($-0.098\,\text{MPa}$). This guide details four core capacity classes — Pilot & Small Batch Units (100L–300L), Commercial Production Mixers (500L–1,000L), Heavy Industrial Workhorses (1,500L–2,000L), and Automated High-Tonnage Systems (3,000L+) — to assist process engineers in selecting the optimal drive configuration, vacuum cover, and contact metallurgy before procurement.
POLYC dual shaft mixers operate across automotive putty, polyurethane sealant, texture plaster, and battery slurry pre-mixing plants throughout North America, Europe, Latin America, and Southeast Asia.
POLYC Dual Shaft Mixer: Independent Twin Motors, Heavy-Duty Hydraulic Lifting Ram, Hermetic Vacuum Cover, and Wall-Scraping Anchor Assembly.
Dual Shaft Disperser Model Specifications & Working Capacities
| Model Series & Class | Total Tank Volume | Working Load (40–70%) | Dual Motor Power (High + Low) | Scraper & Vacuum Seal | Relative Investment Tier |
|---|---|---|---|---|---|
| 1. Pilot & Small Batch (SDM-100 / SDM-300) | 100L – 300L | 40L – 200L (50 – 300 kg/batch) |
High: 5.5 – 11 kW (0–1,500 rpm) Low: 2.2 – 4.0 kW (0–45 rpm) |
Spring-loaded virgin PTFE scrapers; Cartridge mechanical seal with ≤ -0.098 MPa vacuum rating | Pilot & Batch Tier |
| 2. Commercial Production (SDM-500 / SDM-1000) | 500L – 1,000L | 200L – 700L (300 – 1,100 kg/batch) |
High: 18.5 – 37 kW (0–1,200 rpm) Low: 5.5 – 11 kW (0–35 rpm) |
Reinforced anchor with dual-side + bottom scrapers; Hydraulic lid raising with pneumatic locking | Core Commercial Tier |
| 3. Heavy Industrial (SDM-1500 / SDM-2000) | 1,500L – 2,000L | 600L – 1,400L (900 – 2,200 kg/batch) |
High: 45 – 75 kW (0–1,000 rpm) Low: 15 – 22 kW (0–30 rpm) |
Multi-tier dispersing discs (dual Cowles) + heavy helical-bevel gearbox; Dimple cooling jacket | Heavy Industrial Tier |
| 4. High-Tonnage Automated Skid (SDM-3000+) | 3,000L+ | 1,200L – 2,200L+ (1,800 – 3,500+ kg) |
High: 90 – 132 kW (0–900 rpm) Low: 30 – 45 kW (0–25 rpm) |
Stationary platform mount with bottom discharge valve; Integrated vacuum pump skid + SCADA console | Turnkey High-Tonnage Tier |
*Note: Batch weight capacity is determined by formulation specific gravity ($1.0\text{--}1.8\,\text{g/cm}^3$). All SDM series mixers feature independent VFD frequency controllers for both high-speed and low-speed shafts. Available in SUS304, acid-resistant SUS316L, or wear-resistant tungsten carbide coatings.
How to Select Your Dual Shaft Disperser Configuration
Select the ideal agitator combination, drive layout, and vacuum envelope based on product rheology, paste thixotropy, and degassing requirements:
Scenario A: Automotive Polyester Putty & Body Fillers (20,000–80,000 cPs)
Process Profile: Wetting massive volumes of talc, calcium carbonate, and hollow glass microspheres into unsaturated polyester resin.
Optimal Configuration: SDM-1000 Vacuum Mixer with an outer framed anchor and dual high-speed Cowles discs. The anchor folds buoyant hollow microspheres into the central vortex without crushing them, while the high-speed blade disperses dense mineral powders under $-0.098\,\text{MPa}$ vacuum to eliminate entrapped air voids that cause pinholing during paint sanding.
Scenario B: Polyurethane, Silicone & Acrylic Mastic Sealants (30,000–100,000 cPs)
Process Profile: Highly thixotropic pastes requiring intense vacuum degassing, moisture-free blanketing, and thermal cooling.
Optimal Configuration: Coaxial Dual Shaft Mixer with Dimple Cooling Jacket and Nitrogen ($N_2$) inerting ports. Self-adjusting hinged PTFE scrapers clean vessel sidewalls constantly, ensuring rapid heat transfer from exothermic reactions. Combined with downstream hydraulic discharge press rams for viscous cartridge filling.
Scenario C: Architectural Textured Plasters, Skim Coats & Stucco (10,000–40,000 cPs)
Process Profile: High solid content formulations blending emulsion polymers with graded aggregate sands and cellulose thickeners.
Optimal Configuration: Atmospheric Dual Shaft Disperser with hydraulic lift. Low-speed helical ribbon or paddle anchor prevents abrasive quartz sand from settling at the tank floor, while the high-speed disperser dissolves associative thickeners without blade cavitation.
Scenario D: Battery Electrode Pastes & Conductive Inks (5,000–25,000 cPs)
Process Profile: Dispersing carbon black and conductive additives into binder solutions with zero metallic contamination.
Optimal Configuration: SUS316L sanitary construction mirror-polished to $Ra \le 0.4\,\mu\text{m}$, paired with tungsten carbide coated dispersing discs. High vacuum (-0.098 MPa) extracts microscopic air bubbles from carbon nanoparticles, preparing uniform paste for downstream wet bead milling.
Associated High-Viscosity Mixing & Downstream Milling Machinery
Dual Shaft Disperser
Low-speed anchor scraper plus high-speed Cowles disc for 5,000–100,000 cPs.
Jacketed Mixing Tank
Movable stainless tank with thermal cooling jacket and bottom flush valve.
Horizontal Bead Mill
Continuous sub-micron wet milling for high-solids pastes pre-dispersed on SDM.
Turnkey Process Skid
Pre-assembled mezzanine skid with automated dosing and centralized PLC.
Engineering Architecture: Dual Kinematics, Vacuum Degassing & Thermal Transfer
1. Complementary Dual Kinematics: Low-Speed Scraper + High-Speed Cowles Shear
At viscosities above 10,000 cPs, fluids exhibit non-Newtonian pseudoplastic or thixotropic behavior. Single disperser blades create a narrow localized shear cavity ("doughnut hole"), while outer fluid layers remain static.
The POLYC SDM combines two independent kinematic streams: The outer anchor agitator ($15\text{--}45\,\text{rpm}$) rotates along the inner wall profile, using spring-loaded virgin PTFE scraper blades to strip boundary layers continuously. It lifts bottom sediments and folds viscous mass toward the center. Simultaneously, the inner high-speed shaft ($500\text{--}1,500\,\text{rpm}$) spins a precision sawtooth Cowles blade at peripheral velocities of 20 to 25 m/s. This dual action eliminates stagnation zones, ensuring 100% of the batch passes through the high-shear dispersion zone every few minutes.
2. Deep Vacuum Degassing ($-0.098\,\text{MPa}$) & Bubble Extraction
Adding dry powders into viscous binders naturally entraps microscopic air bubbles. In sealants, putties, and electronic pastes, micro-voids cause structural joint failure, uneven extrusion, and paint sanding pinholes.
POLYC SDM mixers feature a reinforced domed vacuum cover sealed with a high-resilience silicone O-ring, rated for continuous vacuum operation down to $-0.098\,\text{MPa}$ (28" Hg). The drive shafts pass through heavy-duty balanced cartridge mechanical seals lubricated by pressurized barrier fluid. As the anchor blades spread the viscous paste across the wall surface in a thin film under vacuum, entrapped air pockets expand and burst instantly, delivering high-density, bubble-free finished products.
3. Coaxial Concentric Drives vs. Parallel Off-Center Shaft Arrangements
POLYC engineers both primary architectural configurations tailored to client application requirements:
• Coaxial Concentric Shaft: The high-speed shaft passes directly through the hollow center of the low-speed anchor shaft. This provides a compact, symmetrical footprint ideal for standardized cylindrical tanks, balanced dynamic rotation, and cleanroom installations.
• Parallel Dual Shaft (Off-Center): The high-speed disperser shaft and the low-speed anchor shaft are mounted parallel to each other at calculated offset center distances. This layout generates an asymmetric fluid flow that breaks symmetrical vortexing, accelerating powder wet-in for dense mineral fillers like calcium carbonate and talc.
4. Heat Transfer Dynamics & Dimple Cooling Jackets
High-shear mechanical dispersing of viscous paste converts electrical motor energy into intense frictional heat. If unmanaged, temperatures exceed formulation limits ($> 70^\circ\text{C}$), causing premature curing of polyurethanes, thermal degradation of acrylic polymers, or solvent flash-off.
POLYC movable mixing tanks incorporate full-height dimple cooling jackets or spiral-baffled annular shells tested to 0.6 MPa. The low-speed anchor scrapers continuously peel the insulating boundary layer from the tank walls, replacing it with hot core material. This constant fluid renewal increases the overall heat transfer coefficient ($U$-value) by up to 300% compared to static tanks, keeping sensitive pastes within safe operating temperature windows.
What Factors Drive the Price of a Dual Shaft Disperser & Mixer?
When evaluating commercial equipment proposals for dual shaft dispersers, total capital figures reflect four primary engineering specifications:
1. Drivetrain Architecture & Combined Motor Kilowatts
Unlike single-motor machines, a dual shaft mixer requires two independent premium motors, two variable frequency inverters (VFD), and a heavy-duty reduction gearbox for the anchor. Total installed power ranges from 7.7 kW on a 100L pilot unit to over 150 kW on a 3,000L production machine, directly driving drivetrain costs.
2. Vacuum System & Mechanical Seal Complexity
Atmospheric open-tank configurations represent the baseline cost. Adding a reinforced vacuum lid, hydraulic lid lifting cylinders, rotary vacuum joints, double-face cartridge mechanical seals with barrier fluid reservoirs, and a rotary vane/roots vacuum pump skid increases capital outlay.
3. Contact Metallurgy & Sanitary Surface Polishing
Standard industrial SUS304 with mill finish suits putties and textured coatings. Processing corrosive adhesives, water-based silicones, or electronic pastes demands acid-grade SUS316L with sanitary electro-chemical mirror polishing ($Ra \le 0.4\,\mu\text{m}$) and tungsten carbide wear protection.
4. ATEX Explosion-Proofing & Hydraulic Discharge Presses
Handling flammable solvent-based mastics demands ATEX Zone 1 / Class I Div 1 flameproof dual motors, explosion-proof operator consoles, and intrinsic safety barriers. In addition, pairing the mixer with a companion Hydraulic Discharge Ram (Extrusion Press) adds standalone mechanical press equipment.
Why Choose POLYC for Dual Shaft Disperser Mixers?
CNC boring of dual-shaft transmission heads, hydraulic ram alignment, and full-load paste testing at POLYC's 9,000 m² Wuxi manufacturing plant.
🏭 Real Direct Factory Manufacturing & Custom Engineering
Shanghai Polyc Technology Co., Ltd. fabricates all SDM series dual shaft dispersers, hydraulic columns, and jacketed vacuum tanks inside our wholly-owned 9,000 m² production workshop in Wuxi, Jiangsu Province. Sourcing directly eliminates intermediary markups, connects your chemical engineers directly with machine designers, and ensures strict ISO9001 and CE compliance.
🤝 3-Year Global Warranty & Priority Spare Parts
All genuine POLYC dual shaft mixers include our standard 3-Year Global Warranty covering structural frames, hydraulic lift cylinders, primary drive shafts, gearboxes, and main electric motors. We stock replacement PTFE scraper blades, Cowles discs, mechanical seals, and hydraulic valves for priority air-express dispatch within 3 to 5 business days.
🧪 Free High-Viscosity Laboratory Trial & Rheology Profiling
Unsure whether your formulation requires a dual shaft disperser or a double planetary mixer? Send a 10L to 20L formulation sample to our Wuxi pilot testing laboratory. Our process engineers will run trials on our pilot SDM mixers, delivering full viscosity torque curves, temperature rise charts, and deaeration metrics before equipment sizing is finalized.
Ready to Specify Your Dual Shaft Disperser & Mixer?
Share your fluid properties (target viscosity in cPs, thixotropy, solid filler content), batch volume requirements, and plant electrical standards with our Wuxi engineering desk — we will deliver an optimized proposal and direct factory quote within 24 hours.
Frequently Asked Questions
What viscosity range is best suited for a Dual Shaft Disperser Mixer?
Why is an anchor scraper necessary alongside a high-speed disperser blade?
What is the difference between a Coaxial Mixer and a Parallel Dual Shaft Mixer?
How does deep vacuum (-0.098 MPa) benefit viscous paste production?
How is high-viscosity paste discharged from the mixing vessel?
What engineering factors determine the quotation of a dual shaft disperser?
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