Mixers
Concentric Double Shaft Mixer
Concentric Double Shaft Mixer: Scraper agitator with concentric high-speed disperser; frame, half-frame and multi-disc options. Capacity: 100-12,000 L. Capacity range 100 - 12,000 L. Typical applications: Industrial Coatings, Adhesives & Sealants, Architectural Paints, Printing Inks, Construction Chemicals.
Scraper agitator with concentric high-speed disperser; frame, half-frame and multi-disc options. Capacity: 100-12,000 L.
The POLYC Concentric Double-Shaft Mixer combines a wall-scraping anchor and a high-speed dispersing disc on a single concentric shaft, so one machine both conveys high-viscosity batches and disperses them in the same vessel. With working capacities from 300 to 6,000 L and dispersing tip speeds up to 22 m/s, it is engineered for high-solid, high-viscosity coatings, inks, adhesives and sealants where wall fouling and temperature rise are the real enemies of quality.
Key Facts
- Equipment Type
- Mixers
- Capacity / Batch Range
- 100 - 12,000 L
- Motor Power
- 15 - 110 kW
- Max Viscosity
- up to approximately 200,000 cP
- Typical Applications
- Industrial Coatings, Adhesives & Sealants, Architectural Paints, Printing Inks
Request a Quote
Response within 24 hours · Engineering consultation · Application review available
Where the POLYC Concentric Double-Shaft Mixer Performs Best
Industry ApplicationsA single-axis dual-action mixer built for materials that are too thick or too solid-loaded for a conventional disperser. Its wall-scraping anchor keeps the batch moving while the high-speed disc does the shearing — ideal for coatings, inks, adhesives and sealants.
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Industrial Coatings
As a concentric double-shaft mixer for industrial coatings, it handles solvent and water-based formulations, anticorrosive paints and heavy-duty protectives. The wall-scraping anchor keeps high-solid batches homogeneous while the jacketed vessel controls exotherm over long runs.
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Adhesives & Sealants
For high-viscosity adhesive and sealant mixing, the dual action moves 100,000+ cP pastes by bulk convection and disperses them at the same time. An optional vacuum system removes trapped air from epoxies, polyurethanes and silicone sealants.
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Printing Inks
Widely used for ink dispersion, including offset, gravure, flexographic and screen inks. The high-speed dispersing shaft reaches up to 22 m/s tip speed for fine pigment breakdown, while the anchor prevents settlement during filling and transfer.
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Architectural Paints
For emulsion and latex paint production, one drive serves multiple tanks via its hydraulic lift and swing. Fast colour changeover and mirror-polished contact parts make it practical for tinting and medium-scale batch production.
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Pigment Pastes & Concentrates
For pigment paste dispersion, the Teflon scrapers continuously clear the wall film so TiO2, iron oxides and phthalocyanines disperse uniformly with no dead zones and no local overheating.
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Pharmaceuticals & Cosmetics
Suited to ointment, cream and paste APIs in stainless steel 316L. Vacuum deaeration and jacketed heating or cooling deliver defect-free, temperature-sensitive high-viscosity products.
POLYC Concentric Double-Shaft Mixer at a Glance
Series Overview300–6,000L
Working Capacity
15–110kW
Motor Power
≤200,000cP
Viscosity Range
22m/s
Tip Speed
Key Design Features
EngineeringOne Axis · Two Actions⚙️
Concentric Anchor + Disperser
- Single concentric shaft carries both the wall-scraping anchor and the high-speed dispersing disc
- One drive, two independent motions
- Smaller footprint than a separate mixer plus disperser
Bulk + Shear🔀
Convection & Dispersion
- Anchor provides slow bulk turnover of the whole batch
- Dispersing disc adds high-shear at tip speeds up to 22 m/s
- No stratification in high-solid batches
Wall-Scraping🪓
Anchor for Viscous & Thixotropic
- Teflon scrapers cling to the vessel wall
- Continuously clears wall film — no dead zones
- Ideal for thixotropic and sticky masses
Rugged Drive🔧
Compact Integrated Drive
- Low-vibration, low-noise operation
- Engineered for big-batch duty
- Fixed speed or inverter variable speed
Vacuum + Jacketed❄️
Vacuum & Jacketed Vessel
- Vacuum deaeration available on request
- Jacketed wall for heating or cooling
- Stable temperature on exothermic batches
Multi-Tank⬆️
Hydraulic Lift & Swing
- Lift / swing serves one or several tanks
- Mirror-polished SS304 / 316L contact parts
- Easy disassembly and cleaning
Applications by Industry
Selection| Industry | Typical Products | Why Concentric Fits |
|---|---|---|
| Industrial Coatings | Solvent / water-based paints, anticorrosive, marine | Wall-scraping anchor keeps high-solid batches uniform; jacket controls exotherm |
| Adhesives & Sealants | Epoxy, PU, silicone, structural adhesives | Dual action handles 100,000+ cP pastes; vacuum option deaerates |
| Printing Inks | Offset, gravure, flexo, screen inks | 22 m/s tip speed for fineness; anchor prevents pigment settlement |
| Architectural Paints | Emulsion / latex, textures, putties | One drive serves multiple tanks; fast colour changeover |
| Pigment Pastes | TiO2, iron oxide, phthalo concentrates | Scraper clears wall film for uniform dispersion, no dead zones |
| Pharmaceuticals | Ointment, cream, paste APIs | SS316L mirror-polished; vacuum deaeration for defect-free product |
| Construction Chemicals | Tile adhesives, grouts, waterproofing | Rugged, low-vibration construction for big-batch duty |
| Cosmetics | Creams, lotions, colour cosmetics | Gentle bulk mixing plus on-demand shear; jacketed temperature control |
| Wood Coatings | Stains, lacquers, UV-curable | Consistent viscosity; hydraulic swing serves several finishing tanks |
| Marine Coatings | Antifouling, heavy-duty protectives | High-solid, thixotropic masses processed without agglomerates |
Choosing the Right Concentric Double-Shaft Mixer
How to Choose1
What viscosity and solids are you running?
Up to ~200,000 cP with high solid load or thixotropy → Concentric double-shaft. For > 1,000,000 cP kneading pastes → Planetary mixer. For pourable low-viscosity liquids → a single High-Speed Disperser is enough.
2
How many tanks and what batch size?
Vessels from 300 to 6,000 L. The hydraulic lift and swing mechanism let one drive serve a single tank or several — ideal when you colour-change or run many formulations.
3
Which process options do you need?
Vacuum deaeration, jacketed heating / cooling and hydraulic lift are all available options. Confirm them before final sizing so the vessel and drive are specified correctly.
Related Technical Guides
Guides
SelectionTypes of Paint Mixing Machines: Which Mixer Fits Your Coating?
ComparisonDual Shaft vs Triple Shaft Mixer for Sealants
GuideHigh Viscosity Mixer Selection Guide
ApplicationAdhesive & Sealant Mixing to Filling: High-Viscosity Solutions
Need help sizing a concentric double-shaft mixer for your process?
Request a QuotationApplication Scenarios: Slurry Paste, Pigment Paste and Composite Materials
The concentric layout is chosen when a scraper frame and a high-speed disperser must work in the same vessel. It is ordered as a slurry paste double shaft mixer and a pigment paste double shaft mixer for high-solids pastes, as a composite material double shaft mixer for filled and reinforced compounds, and as a vacuum double shaft mixer where the batch has to be deaerated before discharge. Plants describing the same machine simply as a concentric double shaft mixer use it for thixotropic coatings, pastes and resins from 100 to 12,000 L.
Typical Viscosity Range
This machine is engineered for the following viscosity band. The exact model and blade configuration are selected after reviewing your material and process.
| Typical viscosity | Up to 100,000 cps |
|---|---|
| Typical materials | High-viscosity, high-solid-content materials with wall-scraping agitation |
Description
How it works
The POLYC Concentric Double-Shaft Mixer is a heavy-duty dispersing and mixing system built around a single concentric shaft that carries both a wall-scraping anchor and a high-speed dispersing disc. The anchor slowly turns the entire batch to provide bulk convection, while the dispersing disc generates intense high-shear flow at tip speeds up to 22 m/s. This dual action lets one machine both move high-viscosity masses and break down agglomerates in the same vessel.
During operation the Teflon scrapers on the anchor continuously cling to the precisely machined, mirror-polished vessel wall and strip away the boundary-layer film that forms on high-solid and thixotropic materials. By eliminating wall dead zones, the mixer keeps temperature and viscosity uniform across the batch and prevents local overheating during long, exothermic runs.
The vessel is available with a jacket for heating or cooling and can be run under vacuum to remove entrapped air from pastes and adhesives. A hydraulic lift and swing mechanism lets a single drive serve one or several tanks, while contact parts in stainless steel 304 or 316L are easy to disassemble and clean. The result is a rugged, low-vibration, low-noise platform suited to big-batch production of coatings, inks, adhesives, sealants and similar high-viscosity products.
INDUSTRIES THIS MACHINE SERVES
Industries we serve
Adhesives & Sealants
High-viscosity mixing for adhesives, sealants, and polymer compounds.
Learn more →Battery Materials
High-viscosity cathode/anode slurry mixing for lithium battery production.
Learn more →Food & Chemical
Powder and paste mixing for food, pharmaceutical, and chemical applications.
Learn more →TYPICAL PERFORMANCE REFERENCE
| Material Type | Viscosity Range | Recommended Machine Type | Batch Size |
|---|---|---|---|
| Low-viscosity liquid | < 10,000 cP | Double shaft / high-speed | 100-2,000 L |
| Medium-viscosity paste | 10,000-100,000 cP | Planetary mixer | 50-1,000 L |
| High-viscosity compound | > 100,000 cP | Planetary / kneader | 50-500 L |
Typical reference values only. Actual results depend on formulation, bead material, and process conditions. Material testing is recommended before final selection.
Looking for a complete adhesive or sealant production line?
View Turnkey Adhesive Line →CONCENTRIC VS PLANETARY VS BUTTERFLY
Which mixer fits your high-viscosity material?
| Dimension | Concentric Double-Shaft | Planetary Mixer | Butterfly Double-Shaft |
|---|---|---|---|
| Shaft arrangement | Single concentric shaft: anchor + disc | 2-3 offset orbiting arms | Dual parallel shafts: anchor + disc |
| Viscosity range | up to ~200,000 cP | up to ~1,500,000 cP | up to ~150,000 cP |
| Wall scraping | Continuous on central shaft | Via orbiting paddles | Continuous on both shafts |
| Best for | High-solid coatings, inks, adhesives | Kneading pastes, sealants, slurry | Paste, offset ink, putty |
| Footprint | Compact single drive | Larger bowl + arms | Compact dual drive |
| Vacuum / jacket | Available | Commonly available | Available |
Read the full comparison guide: Types of Paint Mixing Machines: Which Mixer Fits Your Coating?
Process Engineering
Working Principle
- 1
The high-speed shaft disperses solids and breaks agglomerates while the low-speed agitator turns over the bulk product.
- 2
A wall scraper continuously returns material from the vessel wall and heat-transfer surface to the mixing zone.
- 3
The combined flow handles higher viscosity more uniformly than a single high-speed shaft alone.
Equipment Benefits
Equipment Advantages
- ✓
Combines high-shear dispersion with strong bulk turnover.
- ✓
Wall scraping reduces stagnant material and improves heat transfer.
- ✓
Handles higher viscosity and solids loading than a single-shaft disperser.
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Vacuum and jacket options consolidate multiple batch operations.
Technical Data
Technical Specifications
| Parameter | Value |
|---|---|
| Working capacity | 300 - 6,000 L |
| Motor power | 15 - 110 kW |
| Viscosity range | up to approximately 200,000 cP |
| Agitation | Concentric anchor plus high-speed dispersing shaft |
| Tip speed | up to 22 m/s on the dispersing shaft |
| Contact material | Stainless steel 304 / 316L |
| Options | Vacuum, jacketed vessel, hydraulic lift |
PRODUCT INQUIRY
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Equipment Guidance
Frequently Asked Questions
What is a concentric double-shaft mixer and how does it differ from a planetary mixer?
A concentric double-shaft mixer carries a wall-scraping anchor and a high-speed dispersing disc on a single central shaft. A planetary mixer uses two or three offset arms that revolve around the bowl. The concentric design suits high-solid, high-viscosity batches up to about 200,000 cP with continuous wall scraping, while a planetary mixer reaches higher viscosities (above 1,000,000 cP) at the cost of a larger footprint.
What viscosity range can the concentric double-shaft mixer handle?
It is engineered for materials from low viscosity up to approximately 200,000 cP, including thixotropic and high-solid pastes. For kneading-grade masses above roughly 1,000,000 cP, a planetary mixer is the better choice.
How does the wall-scraping anchor improve mixing quality?
The anchor is fitted with Teflon scrapers that cling to the mirror-polished vessel wall and continuously strip the boundary-layer film that forms on thick materials. This eliminates dead zones, keeps temperature and viscosity uniform, and prevents local overheating during long, exothermic batches.
What is the dispersing disc tip speed and why does it matter?
The high-speed dispersing shaft runs at tip speeds up to 22 m/s. Higher tip speed produces stronger high-shear flow, which breaks down agglomerates and wets pigments faster - essential for fine inks, coatings and pigment pastes.
Can the vessel be jacketed and run under vacuum?
Yes. The vessel is available with a jacket for heating or cooling and can be operated under vacuum to remove entrapped air from pastes and adhesives. Both options are specified at the order stage.
What working capacities and motor powers are available?
Working capacity ranges from 300 to 6,000 L with motor power from 15 to 110 kW. The hydraulic lift and swing mechanism lets one drive serve a single tank or several tanks.
What materials are the contact parts made from?
All product-contact parts are stainless steel 304 or 316L, mirror-polished for easy cleaning and to support hygienic or corrosion-sensitive applications such as pharmaceuticals and cosmetics.
How long does colour changeover or cleaning take?
The anchor and dispersing assembly are easy to disassemble and clean, and the mirror-polished surfaces minimise residue. With the hydraulic lift, the head swings away from the tank for fast access, making changeover comparable to other double-shaft mixers in its class.
Industry Applications
Applications
Industrial Coatings
viscous coating dispersion with anchor and disperser on one axis to ≤200,000 cP
Adhesives & Sealants
viscous adhesive and sealant manufacturing
Architectural Paints
thixotropic coating and paste mixing with simple sealing
Printing Inks
viscous ink and varnish blending
Construction Chemicals
coating compound and paste mixing
Cosmetics
viscous cream and paste blending
Pigment Pastes
pigment paste incorporation and letdown at high viscosity
Pharmaceuticals
viscous gel and paste mixing
Wood Coatings
viscous coating and filler mixing
Marine Coatings
high-build coating mixing with wall contact
WHY POLYC MACHINE
Built on 25 Years of Engineering Excellence
Every machine is designed by our in-house R&D team, built in our own factory, and supported by the same team that has delivered over 8,000 systems worldwide.
ISO 9001 & CE Certified
Manufactured under an ISO 9001 quality management system. All machines comply with CE directives, with EC Declaration of Conformity for every order.
25 Years Experience
Since 2001, POLYC has engineered wet grinding, dispersing and mixing systems for global manufacturers.
3-Year Warranty
Every machine carries a 3-year warranty with ongoing spare-parts supply and technical support after delivery.
30-Day Delivery
Standard models ship within 30 days of order confirmation. Custom-engineered lines are scheduled against your project timeline.
Free Installation Guidance
Free installation guidance and operator training are included with every machine, covering commissioning and safe start-up.
Custom Engineering
From lab-scale 0.5L to 12,000L production systems. Material testing, configuration and process design included.
24-Hour Response
Engineering consultation within 24 hours. Application review, technical specs and quotation delivered fast.
Global Shipping
Export-ready packaging with full documentation. DDP/FOB/CIF terms available for 80+ countries.
Lifetime Technical Support
Genuine spare parts, remote diagnostics and lifetime technical support for every machine we build.
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