What a high-speed disperser does
A high-speed disperser breaks agglomerates in low-to-medium viscosity slurries with a high-tip-speed saw-tooth disc. It de-agglomerates pigment and filler batches before fine milling, and is the workhorse of paint, ink, and coating premixing. Its output is a well-wetted, de-agglomerated premix - not the final sub-micron grind, which a bead mill delivers afterward.
Single shaft disperser
A single shaft disperser uses one saw-tooth impeller on one shaft. It is simple, economical, and ideal for one-tank batch premixing of pigments and fillers up to roughly 50,000 mPa·s. Changeover is fast and the footprint is small. For selection details see how to choose a high speed disperser and the high speed disperser specifications guide.
Dual shaft disperser
A dual shaft disperser adds a slow low-speed anchor or sweep blade under the high-speed disc. The anchor moves the whole batch past the disc, scrapes the wall, and handles higher viscosity and heat-sensitive pastes. It also lets you disperse and knead in one vessel, cutting transfer steps. Compare impeller choice in high-speed disperser impeller selection.
Key differences: single vs dual shaft
| Factor | Single shaft | Dual shaft |
|---|---|---|
| Viscosity range | Low to medium | Medium to high |
| Wall scraping | No | Yes (anchor) |
| Heat-sensitive paste | Limited | Better (uniform mixing) |
| Cost | Lower | Higher |
| Best for | Paint, ink premix, batches | Sealant, high-visc paste, one-pot |
Which should you choose?
Choose single shaft for straightforward premixing of paint, ink, and coating bases where viscosity stays moderate and changeover speed matters. Choose dual shaft when the paste is thick, heat-sensitive, or you want disperse-and-knead in one tank - common in sealants and high-solid systems. If throughput or fineness later needs milling, pair it with a bead mill as covered in disperser vs bead mill, and watch common disperser problems.