The stirring blade (impeller) is one of the most important factors determining mixing efficiency. Selecting the wrong blade leads to insufficient mixing, excessive heat generation, or mechanical damage to sensitive samples.
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Major Types of Stirring Blades
Paddle (Flat Blade)
The most common general-purpose blade. Produces radial flow and is effective for low-to-medium viscosity liquids. Simple construction makes it easy to clean.
Propeller (Marine-Type)
Produces strong axial flow with good liquid circulation from top to bottom. Effective for low-viscosity liquids and large-volume mixing. Widely used in the Three-One Motor lineup.
Anchor
Shaped like an anchor to closely follow the vessel wall. Particularly effective for high-viscosity fluids and materials that tend to stick to vessel walls. Often used in combination with a scraper.
Turbine (Rushton)
Multi-blade disc turbine generating high shear radial flow. Used for gas dispersion, emulsification, and liquid-liquid mixing in chemical and pharmaceutical applications.
Ribbon (Helical)
A helical ribbon winding around a central shaft. Ideal for very high viscosity materials (pastes, gels, slurries) that standard propellers cannot effectively mix.
Blade Selection by Viscosity
| Viscosity range | Recommended blade type |
|---|---|
| Low (water-like, <100 mPa·s) | Propeller, turbine |
| Medium (100–10,000 mPa·s) | Paddle, propeller |
| High (10,000–100,000 mPa·s) | Anchor, paddle |
| Very high (>100,000 mPa·s) | Ribbon, anchor |
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