A ribbon blender is a horizontal, trough-shaped batch reactor with dual counter-rotating helical ribbon impellers; an outer ribbon conveying material toward the centre and an inner ribbon in the opposing direction. This counter-directional axial circulation homogenizes dry powders, granules, and semi-moist cohesive solids across batch capacities of 50–50,000 L, operating in the transitional-to-turbulent regime with narrow RTD and RSD values below 5%.
Challenges
Axial Segregation
Density and size differentials drive particle separation toward trough ends.
Wall Dead Zones
3–6 mm ribbon-to-wall clearance creates stagnant wall layers reducing circulation.
Fragile Particle Attrition
Continuous ribbon action fractures coated granules and crystalline particles.
Liquid Addition Non-Uniformity
Point-source addition creates localized over-wet lumping zones.
Electrostatic Buildup
High-speed motion through dry powders generates charge accumulation and discharge hazards.
Solutions
- Variable-Pitch Ribbon Geometry: Equalizes axial transport velocity, suppressing segregation-driven gradients.
- Adjustable Tip Clearance (<3 mm): Eliminates stagnant wall-layer dead volume, improving circulation efficiency.
- VFD Speed Profiling: Enables gentle start for fragile granules; higher speed for dispersion phases.
- Multi-Point Spray Bar: Distributes liquid uniformly across the full powder bed width.
- Full Earthing + CIP System: Prevents static accumulation; Ra <0.4 µm surfaces enable rapid validated cleaning.
Applications
- Pharmaceutical: Tablet/capsule dry blend, lubricant incorporation, granule homogenization under GMP.
- Food & Beverage: Spice blends, powdered beverages, dry soup bases, flour conditioning.
- Chemical: Fertilizer, pesticide dust, specialty chemical powder homogenization.
- Cosmetics: Talc blends, dry foundation premixes, pigment incorporation.
- Plastics & Compounding: Polymer blend preparation, masterbatch premixing, additive incorporation pre-extrusion.
Models & Capacities
| Model | Scale | Net Vol. [L] | Gross Vol. [L] | Batch Size [kg] | Jacket Area [m²] | Trough L [mm] | Trough Ø [mm] | Overall L [mm] | Overall W [mm] | Overall H [mm] | Weight [kg] |
|---|---|---|---|---|---|---|---|---|---|---|---|
| RB-010 | Lab | 10 | 14 | 4–8 | — | 550 | Ø200 | 950 | 400 | 900 | 55 |
| RB-025 | Lab | 25 | 35 | 10–18 | 0.18 | 850 | Ø280 | 1,250 | 520 | 1,050 | 110 |
| RB-050 | Lab/Pilot | 50 | 70 | 20–35 | 0.28 | 1,050 | Ø360 | 1,550 | 650 | 1,150 | 190 |
| RB-100 | Pilot | 100 | 140 | 40–70 | 0.45 | 1,300 | Ø450 | 1,900 | 780 | 1,350 | 320 |
| RB-200 | Pilot | 200 | 280 | 80–140 | 0.75 | 1,650 | Ø560 | 2,300 | 950 | 1,550 | 550 |
| RB-300 | Pilot | 300 | 420 | 120–210 | 1.00 | 1,900 | Ø650 | 2,650 | 1,050 | 1,750 | 820 |
| RB-500 | Production | 500 | 700 | 200–350 | 1.45 | 2,400 | Ø800 | 3,250 | 1,250 | 2,000 | 1,400 |
| RB-750 | Production | 750 | 1,050 | 300–525 | 1.95 | 2,900 | Ø950 | 3,850 | 1,450 | 2,250 | 2,000 |
| RB-1000 | Production | 1,000 | 1,400 | 400–700 | 2.40 | 3,300 | Ø1,050 | 4,350 | 1,600 | 2,450 | 2,800 |
| RB-1500 | Production | 1,500 | 2,100 | 600–1,050 | 3.20 | 3,900 | Ø1,200 | 5,050 | 1,850 | 2,700 | 4,200 |
| RB-2000 | Production | 2,000 | 2,800 | 800–1,400 | 4.00 | 4,500 | Ø1,350 | 5,800 | 2,050 | 2,950 | 5,800 |
| RB-3000 | Production | 3,000 | 4,200 | 1,200–2,100 | 5.50 | 5,400 | Ø1,550 | 6,900 | 2,350 | 3,300 | 8,500 |
| RB-5000 | Large Prod | 5,000 | 7,000 | 2,000–3,500 | 8.00 | 7,000 | Ø1,900 | 8,800 | 2,850 | 3,850 | 14,000 |
| RB-7500 | Large Prod | 7,500 | 10,500 | 3,000–5,250 | 11.0 | 8,500 | Ø2,250 | 10,600 | 3,350 | 4,400 | 21,000 |
| RB-10000 | Large Prod | 10,000 | 14,000 | 4,000–7,000 | 14.0 | 10,000 | Ø2,600 | 12,500 | 3,850 | 5,000 | 30,000 |
| RB-15000 | Large Prod | 15,000 | 21,000 | 6,000–10,500 | 19.0 | 12,000 | Ø3,100 | 15,000 | 4,500 | 5,800 | 45,000 |
| RB-20000 | Large Prod | 20,000 | 28,000 | 8,000–14,000 | 24.0 | 14,000 | Ø3,500 | 17,500 | 5,100 | 6,500 | 62,000 |
| RB-30000 | Large Prod | 30,000 | 42,000 | 12,000–21,000 | 32.0 | 17,000 | Ø4,200 | 21,000 | 6,100 | 7,500 | 95,000 |