Key Factors for High-quality Machine-made Charcoal: Practical Control of Raw Material Moisture & Briquetting Temperature

All charcoal processors know that the combustion performance, appearance, cracking and breakage rate of finished charcoal do not solely depend on the briquette extruder itself.

Raw material moisture content and briquetting forming temperature are the two core factors determining briquette forming rate and finished charcoal quality. Most factories producing substandard charcoal fail to control these two critical details.

Based on on-site workshop experience, this guide clarifies practical standards for raw material moisture, drying temperature, forming temperature and screw propeller maintenance rules. Following these operations greatly improves briquette quality.

To produce dense, smooth briquettes free from cracks and bursting, raw material moisture must be strictly controlled.

Industry practical standard: Moisture content below 10%, optimal range 6%–10%.

Spread high-moisture outdoor-stored materials for 1–2 days of sun airing to evaporate surface water. This shortens drying time and cuts fuel & power consumption.

After airing, feed size-qualified materials into the hot air dryer to precisely reduce moisture below 10% before briquetting.

General dryer operating temperature: 140℃–300℃, suitable for most sawdust, bamboo dust, straw and other biomass feedstock.

Heating rings are installed outside the extruder barrel to assist softening and forming.

The universal stable barrel temperature for normal production is around 350℃. This temperature rapidly softens wood fibers for tight adhesion, producing dense and smooth green briquettes.

Do not rigidly fix the temperature value. Fine-tune it according to raw material type and humidity on site.

The target standard is crack-free, non-whitened and uniformly formed green sticks; test run to find the optimal temperature range matching your materials.

Two easily confused temperature concepts for new operators:

The screw propeller (screw shaft) is the core vulnerable part of the briquette extruder, normally made of No.45 steel.

Its abrasion degree and dimensional accuracy directly affect discharging speed, forming stability and continuous production. Delayed repair after abrasion leads to slow output, poor forming and frequent blockages, disrupting production schedules.

Strict standardized surfacing welding rules for maintenance:

Machinery is only the foundation for premium machine-made charcoal. Three indispensable core links are moisture control, precise temperature adjustment and standardized vulnerable part maintenance.

Stabilize moisture below 10%, match proper forming temperature, and conduct timely propeller maintenance to drastically reduce defective, cracked briquettes.

Finished charcoal features neat appearance, high density and long burning time, bringing better market prices and stable sales channels.