Drying Energy Optimization in Molded Pulp: Cutting the Biggest Cost on the Line

Drying typically accounts for 60–70% of molded pulp energy use, so it is the single biggest cost lever on the line. Optimizing mechanical dewatering before the dryer, recovering exhaust heat, and tuning dryer temperature and air flow can cut drying energy by 20–30%. Because water is easier to press out than to evaporate, better dewatering pays back fastest.

The Scenario: The biggest energy cost

Drying energy faces three challenges:

Pain Points

• Drying consumes 60–70% of line energy, dominating production cost;
• Evaporating water costs far more than pressing it out, so under-dewatering wastes energy;
• Exhaust heat and airflow are often untuned, leaking savings.

The Solution: Three drying-optimization solutions

Drying energy is cut three ways:

1. Mechanical dewatering first Pressing more water out before the dryer cuts the evaporation load, the fastest payback.

2. Dryer temperature and air-flow tuning Optimized temperature and airflow dry faster with less energy per unit.

3. Exhaust heat recovery Recovering dryer exhaust heat preheats incoming air or water, trimming energy 20–30%.

The Result: Lower energy per part

With these optimizations, drying energy falls 20–30%, directly lowering cost per part and improving margin.