For milling pigments (assuming “pigmint” is a typo) with very high viscosity, you need specialized equipment that can handle thick, paste-like materials while ensuring proper dispersion and particle size reduction. Here are the best types of mills for such applications:
1. Three-Roll Mill (3-Roll Mill)
– Best for: Extremely high-viscosity pastes (e.g., inks, paints, cosmetics).
– How it works: Uses three horizontally positioned rollers rotating at different speeds to shear and disperse pigments.
– Advantages:
– Excellent for viscous materials (up to millions of centipoise).
– Precise particle size control.
– No solvent evaporation issues (closed systems available).
– Limitations: Batch processing, slower than some alternatives.
2. Planetary Disperser (Planetary Mixer)
– Best for: High-viscosity pigment pastes requiring intense mixing.
– How it works: Uses a rotating blade in a planetary motion to shear and disperse pigments.
– Advantages:
– Handles thick pastes well.
– Good for premixing before finer milling.
– Limitations: May not achieve ultra-fine particle sizes alone.
.jpg)
3. Basket Mill (Immersion Mill)
– Best for: High-viscosity pigment dispersions in liquid media.
– How it works: A rotating basket filled with grinding media agitates the paste, breaking down particles.
– Advantages:
– Continuous or batch processing.
– Handles viscosities up to ~50,000 cP effectively.
– Limitations: Not ideal for ultra-high viscosities (>100,000 cP).
4. High-Speed Disk Disperser (HSD) + Bead Mill Combo
– Best for: Two-step processing—pre-dispersion followed by fine grinding.
– How it works:
1. HSD breaks down agglomerates initially.
2. Bead mill further refines particles (e.g., horizontal bead mill for high viscosity).
– Advantages:
– Efficient for large-scale production.
– Can handle viscosities up to ~20,000–50,000 cP with proper bead selection.
.jpg)
5. Kneader/Extruder Mixer
– Best for: Ultra-high-viscosity past