Mixers
Butterfly Double Shaft Mixer
Butterfly Double Shaft Mixer: Butterfly agitator plus high-speed disperser for efficient shear mixing of high-viscosity pastes and sealants. Capacity: 100-12,000 L. Capacity range 100 - 12,000 L. Typical applications: Architectural Paints, Adhesives & Sealants, Industrial Coatings, Construction Chemicals, Cosmetics.
Butterfly agitator plus high-speed disperser for efficient shear mixing of high-viscosity pastes and sealants. Capacity: 100-12,000 L.
The POLYC Butterfly Double Shaft Mixer combines a low-speed butterfly agitator with wall-scraping blades and a high-speed disperser on the same drive. The two shafts run simultaneously: the butterfly blade sweeps material from the vessel wall toward the center while the high-speed disc generates shear at the dispersing zone. This dual action handles viscosities from 10,000 to 150,000 cP in a single vessel.
Key Facts
- Equipment Type
- Mixers
- Capacity / Batch Range
- 100 - 12,000 L
- Motor Power
- 11 - 90 kW
- Max Viscosity
- up to approximately 150,000 cP
- Typical Applications
- Architectural Paints, Adhesives & Sealants, Industrial Coatings, Construction Chemicals
Request a Quote
Response within 24 hours · Engineering consultation · Application review available
Where POLYC Butterfly Double Shaft Mixers Perform Best
Industry ApplicationsFrom architectural putty to vacuum-sensitive adhesives, the butterfly double shaft mixer is the efficient choice when a batch needs both bulk blending and high-shear dispersion in the same tank.
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Architectural Paints & Putty
For viscous coatings and putty up to 150,000 cP, the wall-scraping blade keeps material moving off the vessel wall and prevents build-up, giving uniform dispersion and bulk movement for architectural and wood coatings.
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Adhesives & Sealants
Sealant base preparation with improved heat transfer — continuous wall scraping moves material off the jacketed wall so heat is removed evenly. Ideal for silicone, MS polymer and adhesive compounding.
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Industrial & Wood Coatings
Medium-to-high viscosity coating dispersion and bulk movement. The high-speed disc wets and disperses pigments and fillers while the scraper carries the mass through the shear zone for consistent batches.
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Construction Chemicals
Putty, filler and coating compound mixing for construction chemicals. The dual action deagglomerates thick compounds that a single disperser cannot move effectively.
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Cosmetics & Pharmaceuticals
Cream, paste, gel and ointment base mixing with wall-scraping agitation. Mirror-polished vessel wall and Teflon scrapers keep sensitive formulations clean and residue-free.
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Food & Printing Inks
Sauce and paste processing with scraper-assisted temperature control, and viscous ink and paste mixing for printing inks and plastic plastisol coatings up to 150,000 cP.
POLYC Butterfly Double Shaft Mixer at a Glance
Series Overview200–5,000L
Working Capacity
11–90kW
Motor Power
150,000cP
Max Viscosity
20m/s
Disperser Tip Speed
Key Design Features
Engineering2 Shafts⚙️
Dual-Shaft Action
- Low-speed butterfly scraper + high-speed disperser
- Both shafts run simultaneously
- Bulk movement plus shear in one vessel
No Dead Zone🔄
Wall-Scraping Blades
- Teflon scrapers cling to the vessel wall
- Eliminates stagnant zones and build-up
- Mirror-polished inner wall, residue-free
Better Cooling❄️
Efficient Heat Transfer
- Material moved off wall continuously
- Improved jacket heat exchange
- Stable temperature for heat-sensitive batches
Up to 20 m/s🎯
High-Speed Dispersion
- Tip speed up to 20 m/s on dispersing shaft
- High shear for pigments, fillers, polymers
- Variable speed on both shafts
Independent🔌
Variable Speed Control
- Separate speed control on both shafts
- Fixed speed or frequency-inverter driven
- Tuned to material rheology
Multi-Tank📥
Hydraulic Lift
- Lifts cover and agitator assembly
- Easy vessel changeover and cleaning
- Single or multiple tanks supported
Applications by Industry
Selection| Industry | Viscosity | Typical Application |
|---|---|---|
| Architectural Paints | ≤ 150,000 cP | Viscous coating & putty |
| Adhesives & Sealants | Sealant base | Heat-transfer mixing |
| Industrial Coatings | Medium-high | Dispersion & bulk movement |
| Construction Chemicals | Putty / filler | Compound mixing |
| Cosmetics | Cream / paste | Wall-scraping agitation |
| Food | Sauce / paste | Scraper temp control |
| Pharmaceuticals | Gel / ointment | Base mixing |
| Printing Inks | Viscous ink | Paste mixing |
Choosing the Right Double Shaft Mixer
How to Choose1
What viscosity is your material?
10,000–150,000 cP → butterfly double shaft · < 10,000 cP → single high-speed disperser · > 150,000 cP → planetary or triple-shaft mixer
2
Dispersion or blending?
Both in one vessel → double shaft · dispersion only → high-speed disperser · emulsification / gels → triple-shaft mixer
3
What scale and tank setup?
200–5,000 L working capacity · hydraulic lift for multi-tank changeover · vacuum and jacketed heating available on request
Related Technical Guides
Guides
ComparisonDual Shaft Vs Triple Shaft Mixer: Sealant Selection
GuideHigh Viscosity Mixer Guide
Related EquipmentPlatform Triple Shaft Mixer (PSK Multi-Function Kettle)
Need help sizing a butterfly double shaft mixer for your process?
Request a QuotationApplication Scenarios: Automotive Putty, Plastisol and Vacuum Compounding
The scraper-plus-disperser layout suits highly filled, high-viscosity compounds. It is widely used as an automotive putty mixer for polyester body filler and as a butterfly mixer for offset ink where the ink paste must be kept moving while pigment is incorporated. Plastisol processors specify it as a plastisol ink butterfly double shaft mixer, a plastisol color ink mixer and a twin shaft mixer for plastisol color ink for high-viscosity PVC colour pastes, and as a high viscosity mixer for plastisol ink in low-throughput colour kitchens. With a vacuum-rated vessel the same frame becomes a vacuum butterfly mixer for deaerated sealant and plastisol batches.
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 150,000 cps |
|---|---|
| Typical materials | Paste, offset ink, wall and car putty, adhesives |
Description
How it works
The POLYC Butterfly Double Shaft Mixer is a heavy-duty dispersing and mixing system built for high-viscosity materials from 10,000 to 150,000 cP. A low-speed butterfly agitator with Teflon wall-scraping blades and a high-speed disperser run on the same drive, so bulk movement and high-shear dispersion take place in a single vessel.
The butterfly blade sweeps material from the vessel wall toward the centre while the high-speed disc generates shear at the dispersing zone. Teflon scrapers cling to the container wall and continuously remove material that would otherwise build up, and the inner wall is precisely lathed and mirror-polished so nothing is left behind. This keeps heat transfer efficient and eliminates stagnant zones in thick pastes, sealants, and coatings.
The machine sits on a large, stable bedplate for vibration-free, low-noise operation during big-batch production. A hydraulic lift and swing mechanism raises the cover and agitator assembly for fast changeover between single or multiple tanks, and several tank-clamping modes (belt, manual-rotation, and pneumatic) secure the vessel safely during operation. Variable speed is available through a frequency inverter or a fixed-speed drive, vacuum dispersing or mixing can be added on request, and ATEX compliance (II 2GD c IIB T3) is available for hazardous-area installations. Built with proven, rugged components, the mixer is designed for paint, ink, putty, adhesives, and polymer formulations that demand durable, long-service construction.
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.
DOUBLE SHAFT VS TRIPLE SHAFT
Which dual-shaft configuration fits?
| Dimension | Double Shaft Mixer | Triple Shaft Mixer |
|---|---|---|
| Agitator setup | Butterfly scraper + high-speed disperser (2 shafts) | Scraper + disperser + 2nd high-speed emulsifier (3 shafts) |
| Viscosity range | 10,000 - 150,000 cP | 10,000 - 300,000+ cP |
| Dispersion vs emulsification | Shear dispersion of pastes | Dispersing + high-shear emulsification |
| Typical materials | Sealants, adhesives, coatings, putty | Emulsions, gels, high-shear pastes |
| Complexity & cost | Lower | Higher |
| Vacuum option | Available on request | Commonly integrated |
Read the full comparison guide: Dual Shaft Vs Triple Shaft Mixer: Sealant Selection
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.
- ✓
Vacuum and jacket options consolidate multiple batch operations.
Technical Data
Technical Specifications
| Parameter | Value |
|---|---|
| Working capacity | 200 - 5,000 L |
| Motor power | 11 - 90 kW |
| Viscosity range | up to approximately 150,000 cP |
| Agitation | Butterfly scraper plus high-speed dispersing shaft |
| Tip speed | up to 20 m/s on the dispersing shaft |
| Contact material | Stainless steel 304 / 316L |
| Temperature control | Optional jacketed vessel |
PRODUCT INQUIRY
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Equipment Guidance
Frequently Asked Questions
What is a butterfly double shaft mixer?
A butterfly double shaft mixer combines a low-speed butterfly agitator with wall-scraping blades and a high-speed disperser. The two shafts run simultaneously, so the butterfly blade moves material from the vessel wall toward the center while the disperser generates shear. POLYC MACHINE butterfly double shaft mixers handle viscosities from 10,000 to 150,000 cP in a single vessel.
Butterfly double shaft mixer vs triple shaft mixer?
A double shaft mixer uses a scraper plus one high-speed disperser for blending and dispersion up to about 150,000 cP. A triple shaft mixer adds a second high-speed emulsifier for emulsions and gels up to 300,000+ cP. Choose double shaft for sealants, adhesives and coatings; choose triple shaft when emulsification is required.
What viscosity can a butterfly double shaft mixer handle?
POLYC MACHINE butterfly double shaft mixers handle from about 10,000 cP up to approximately 150,000 cP, extending beyond the range of a single high-speed disperser. For materials above 150,000 cP, a planetary or triple-shaft mixer is usually recommended.
How does the wall-scraping action work?
Teflon scrapers on the butterfly agitator cling to the vessel wall and continuously scrape material off the precisely lathed, mirror-polished inner surface. This eliminates stagnant zones and build-up and improves heat transfer from the jacketed wall.
What is the disperser tip speed?
The high-speed dispersing shaft reaches a tip speed of up to 20 m/s, generating the shear needed to disperse pigments, fillers, and polymers in viscous pastes and coatings.
Can the vessel be heated or cooled?
Yes. An optional jacketed vessel supports oil or water circulation heating and cooling, with variable-speed control on both shafts for stable temperature during mixing and dispersion.
What discharge and cleaning options are available?
A hydraulic lift raises the cover and agitator assembly for vessel changeover and cleaning, supporting single or multiple tanks. Vacuum dispersing or mixing is available on request.
How do I choose the right double shaft mixer?
Consider viscosity (10,000-150,000 cP suits a double shaft mixer), whether you need dispersion or just blending, working capacity (200-5,000 L), and whether vacuum or heating is required. Share your material data with POLYC MACHINE engineers for a sized recommendation.
Industry Applications
Applications
Architectural Paints
viscous coating and putty mixing to ≤150,000 cP with wall scraping
Adhesives & Sealants
sealant base preparation with improved heat transfer
Industrial Coatings
medium-high viscosity coating dispersion and bulk movement
Construction Chemicals
putty, filler and coating compound mixing
Cosmetics
cream and paste manufacturing with wall-scraping agitation
Food
sauce and paste processing with scraper-assisted temperature control
Printing Inks
viscous ink and paste mixing
Pharmaceuticals
gel and ointment base mixing
Wood Coatings
viscous primer and filler compound mixing
Plastic Coatings
plastisol and paste coating mixing to ≤150,000 cP
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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