Types of Blades in a Ribbon Blender
1. Inner Ribbon Blades
- Located closer to the blender shaft.
- Push material from the center → outward.
- Creates axial movement.
2. Outer Ribbon Blades
- Positioned near the blender’s vessel wall.
- Push material from the outside → inward.
- Complements inner ribbons to ensure uniform mixing.
3. Continuous Ribbon Blades
- Long, spiral ribbons without gaps.
- Provide smooth material movement.
- Suitable for free-flowing powders and granules.
4. Interrupted Ribbon Blades
- Ribbons are segmented with breaks.
- Prevents dead spots and improves mixing of sticky or cohesive materials.
- Better for viscous powders and bulk density variations.
5. Double Helical Ribbons
- Consist of inner + outer ribbons running in opposite directions.
- Inner ribbon → moves material outward.
- Outer ribbon → moves material inward.
- Ensures fast, uniform mixing of powders, granules, and bulk solids.
✅ Summary:
A Ribbon Blender usually employs a double helical ribbon design (inner + outer blades) to achieve efficient convective mixing. For specialized applications, continuous or interrupted ribbons may be used.
