The mesh size of a grinding machine refers to the fineness of the ground material, determined by the sieve or screen used to separate particles. Mesh size indicates the number of openings per linear inch in a sieve—higher mesh numbers mean finer particles.
Common Mesh Sizes for Grinding Machines
Grinding machines can produce powders ranging from coarse to ultra-fine, depending on the application:
| Mesh Size | Particle Size (Microns, μm) | Typical Applications |
|————–|——————————-|————————-|
| 10 – 20 mesh | 2000 – 841 μm | Coarse grinding (e.g., grains, spices) |
| 30 – 50 mesh | 595 – 297 μm | Medium grinding (e.g., coffee, herbs) |
| 60 – 100 mesh | 250 – 149 μm | Fine powder (e.g., flour, minerals) |
| 120 – 200 mesh | 125 – 74 μm | Very fine powder (e.g., pharmaceuticals) |
| 230 – 400 mesh | <63 μm | Ultra-fine powder (e.g., cosmetics, pigments) |
Factors Affecting Mesh Size in Grinding Machines
1. Screen/Sieve Selection
– Machines often use interchangeable screens with different hole sizes.
2. Grinding Mechanism
– Hammer mills, ball mills, and pin mills produce different particle distributions.
3. Material Properties
– Hardness, moisture content, and brittleness affect grindability.
4. Machine Speed & Feed Rate
– Higher speeds may produce finer particles but risk overheating.
Types of Grinders Based on Fineness
- Coarse Grinders (10–50 mesh) → Hammer mills, crushers
- Medium-Fine Grinders (60–200 mesh) → Impact mills, burr mills
- Ultra-Fine Grinders (>200 mesh) → Jet mills, ball mills
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