Flat die granulators are widely used in pellet production for organic fertilizers, compound fertilizers, feed, biomass pellets, and more. However, not all materials are suitable for direct pelletizing. The physical and chemical properties of the material directly affect pellet quality and flat die granulators stability.

1.Suitable Moisture Content
Too dry (<10%): Material struggles to bind, producing excess powder. Too wet (>30%): Material becomes sticky, clogs the die, and affects output.
2.Proper Particle Size
Material must be pre-crushed to ensure uniform size (usually ≤3mm). Oversized particles shorten die life and reduce pellet yield. Powdery materials may need binders (like humic acid) to improve forming.

3.Adequate Stickiness and Plasticity
Organic materials (like manure or straw) often require binders (like bentonite) for better shaping. Compound fertilizer ingredients must be evenly mixed to ensure stability—preventing loose or brittle pellets.
4.Low Corrosiveness and Abrasiveness
Strongly acidic or alkaline materials can corrode the die. Use stainless or alloy steel dies for durability. Materials with sand or metal impurities should be sieved to avoid accelerating die wear.
5.Stable Chemical Composition
Materials must be mixed uniformly to prevent uneven pellet strength from localized variations. Heat-sensitive materials (like some biomass) need controlled temperatures to avoid degradation.

In short, moisture, particle size, and stickiness are critical for flat die granulators. Optimizing these factors boosts efficiency and pellet quality.