A V blender consists of two cylindrical shells joined at 75–90° forming a V-profile, rotating about a horizontal axis. Each revolution splits the powder charge into both arms then recombines it at the junction, progressively randomising particle positions. Processing 1–5,000 L, an optional intensifier bar extends capability to moderately cohesive powders that resist standard tumble blending.
As the vessel rotates, the charge splits between both shell arms and recombines at the V-junction twice per revolution. This repeated split-and-recombine action randomises particle positions, achieving blend uniformity progressively across the cycle. The optional intensifier bar provides localised high-shear agglomerate dispersion during targeted blend phases without affecting the overall tumble blending mechanism.
Challenges
Arm-End Segregation
Dense or coarse particles migrate toward shell extremities and are not fully corrected by junction recombination, creating concentration gradients at blend endpoint.
Intensifier Bar Particle Attrition
High-speed bar operation generates shear sufficient to fracture fragile granules and coated pellets if activated throughout the full blending cycle.
Asymmetric Loading
Unequal component distribution between arms at charging increases the number of revolutions required to achieve blend uniformity.
Limited Sampling Access
Junction-only sampling may not represent arm-end composition during early blend phases, risking premature endpoint declaration.
Intensifier Scale-Up Complexity
Bar tip speed and power input do not scale predictably with vessel diameter, requiring independent validation at each production scale.
Solutions
- Arm-End Deflector Plates: Redirect arm-end particle accumulations back toward the junction during each descent, reducing segregation of dense or coarse components at shell extremities.
- VFD-Controlled Intensifier Bar Windows: Activating the intensifier bar only during defined blend phases limits fragile particle attrition while still achieving agglomerate dispersion where needed.
- Symmetric Split-Charging Protocol: Distributing each component equally between both arms at charging minimises initial composition asymmetry and reduces revolutions required to reach blend uniformity.
- Multi-Position NIR Sampling: Monitoring blend uniformity at the junction and both arm mid-points provides spatially resolved endpoint data, preventing premature or delayed endpoint declaration.
- Independent Scale-Up of Tumble Speed and Intensifier Bar: Matching vessel Froude number and bar tip speed independently at each scale ensures both blending mechanisms perform equivalently across laboratory and production vessel sizes.
Applications
- Pharmaceutical: Active-excipient blend for direct compression, lubricant blending, high-uniformity multi-component blends.
- Chemical: Catalyst powder blending, fine chemical premix, specialty additive homogenization.
- Food Processing: Powdered flavour systems, dry mix blending, nutritional premix preparation.
- Cosmetics: Talc blends, pigment incorporation into dry bases, mineral makeup powder homogenization.
Models & Capacities
| Standard V Blender — Models & Capacities (4 L Laboratory to 20,000 L Large Production) | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Model | Scale | Net Vol. [L] | Gross Vol. [L] | Batch Size [kg] | Shell Leg Length [mm] | Shell Leg Ø [mm] | Speed [RPM] | Motor [kW] | Mixing Time [min] | CV [%] | Overall L [mm] | Overall W [mm] | Overall H [mm] | ||||||||
| VB-004 | Lab | 2 | 4 | 0.5–1.5 | 200 | Ø100 | 6–25 | 0.09 | 5–15 | <5 | 480 | 320 | 520 | 28 | |||||||
| VB-010 | Lab | 5 | 10 | 1.5–4 | 280 | Ø140 | 6–25 | 0.12 | 5–15 | <5 | 660 | 430 | 700 | 52 | |||||||
| VB-025 | Lab | 12 | 25 | 4–10 | 380 | Ø190 | 6–20 | 0.18 | 5–15 | <5 | 880 | 580 | 950 | 95 | |||||||
| VB-050 | Lab/Pilot | 25 | 50 | 8–20 | 480 | Ø240 | 6–18 | 0.25 | 5–15 | <5 | 1,100 | 730 | 1,200 | 165 | |||||||
| VB-100 | Pilot | 50 | 100 | 15–40 | 600 | Ø300 | 5–18 | 0.37 | 5–15 | <5 | 1,380 | 920 | 1,500 | 290 | |||||||
| VB-200 | Pilot | 100 | 200 | 30–80 | 750 | Ø380 | 5–16 | 0.55 | 5–15 | <5 | 1,720 | 1,150 | 1,850 | 510 | |||||||
| VB-300 | Pilot | 150 | 300 | 45–120 | 870 | Ø440 | 5–15 | 0.75 | 8–20 | <5 | 2,000 | 1,340 | 2,150 | 780 | |||||||
| VB-500 | Production | 250 | 500 | 75–200 | 1,050 | Ø530 | 4–14 | 1.1 | 8–20 | <5 | 2,420 | 1,610 | 2,600 | 1,350 | |||||||
| VB-750 | Production | 375 | 750 | 115–300 | 1,200 | Ø600 | 4–14 | 1.5 | 8–20 | <5 | 2,760 | 1,840 | 2,960 | 1,950 | |||||||
| VB-1000 | Production | 500 | 1,000 | 150–400 | 1,320 | Ø660 | 4–12 | 2.2 | 8–20 | <5 | 3,040 | 2,020 | 3,260 | 2,700 | |||||||
| VB-1500 | Production | 750 | 1,500 | 225–600 | 1,540 | Ø770 | 4–12 | 3.0 | 8–20 | <5 | 3,540 | 2,360 | 3,780 | 4,000 | |||||||
| VB-2000 | Production | 1,000 | 2,000 | 300–800 | 1,720 | Ø860 | 4–12 | 4.0 | 10–25 | <5 | 3,960 | 2,640 | 4,220 | 5,500 | |||||||
| VB-3000 | Production | 1,500 | 3,000 | 450–1,200 | 2,000 | Ø1,000 | 3–10 | 5.5 | 10–25 | <5 | 4,600 | 3,070 | 4,900 | 8,200 | |||||||
| VB-5000 | Large Prod | 2,500 | 5,000 | 750–2,000 | 2,440 | Ø1,220 | 3–8 | 7.5 | 12–30 | <5 | 5,620 | 3,750 | 6,000 | 13,500 | |||||||
| VB-7500 | Large Prod | 3,750 | 7,500 | 1,125–3,000 | 2,840 | Ø1,420 | 3–8 | 11 | 12–30 | <5 | 6,560 | 4,380 | 6,980 | 20,500 | |||||||
| VB-10000 | Large Prod | 5,000 | 10,000 | 1,500–4,000 | 3,200 | Ø1,600 | 2–6 | 15 | 15–35 | <5 | 7,380 | 4,930 | 7,860 | 29,000 | |||||||
| VB-15000 | Large Prod | 7,500 | 15,000 | 2,250–6,000 | 3,800 | Ø1,900 | 2–5 | 22 | 15–35 | <5 | 8,760 | 5,840 | 9,320 | 45,000 | |||||||
| VB-20000 | Large Prod | 10,000 | 20,000 | 3,000–8,000 | 4,280 | Ø2,140 | 2–5 | 30 | 15–40 | <5 | 9,880 | 6,590 | 10,500 | 62,000 | |||||||