Typical Discharge Temperature of Briquetting Presses

The discharge temperature of a briquetting press depends on the machine type, raw material, and compression pressure, but generally ranges between 60°C and 120°C. This heat is generated by friction and mechanical force during compaction.

Key Factors Influencing Discharge Temperature

1. Machine Type & Pressure

   • Mechanical piston presses (high pressure: 800–1,200 bar) → 90–120°C due to intense friction.

   • Screw extruders (medium pressure: 400–800 bar) → 70–100°C from continuous shearing.

   • Hydraulic presses (lower friction) → 60–90°C, but varies with compression time.

2. Material Properties

   • Biomass (sawdust, straw): 80–110°C (lignin softens at ~70–90°C, aiding binding).

   • Metal chips/swarf: 100–120°C (higher friction from hard particles).

   • Coal/charcoal fines: 60–90°C (less friction, but may require pre-heating).

3. Moisture Content

   • Wet materials (＞15% moisture) may reach lower temps (60–80°C) due to evaporative cooling.

   • Optimal moisture (8–12%) allows efficient heat generation for natural binding.

4. Die Design & Speed

   • Smaller dies + faster cycles → Higher friction → Elevated temps (up to 120°C).

   • Pre-heated dies (for biomass) stabilize output at ~90°C.

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