Dewatering Press Optimization in Molded Pulp: Cutting Moisture Before Drying to Save Energy

The dewatering press removes water mechanically before the dryer, and mechanical removal costs a fraction of thermal drying. Optimizing press pressure, dwell time, and felt condition maximizes water removed — often cutting dryer load by 20–30% and shortening cycle time, since mechanical dewatering is far cheaper per liter than evaporative drying.

The Scenario: Remove water before you evaporate it

Dewatering faces three challenges:

Pain Points

• Water left in the preform forces the dryer to evaporate it, at high energy cost;
• Worn or clogged felts reduce press efficiency, leaving more water in the sheet;
• Insufficient pressure or dwell time under-dewaters, slowing the whole line.

The Solution: Three press-optimization solutions

Three practices maximize dewatering:

1. Optimized pressure and dwell Higher, correctly-timed pressure squeezes more water out before drying.

2. Felt condition monitoring Clean, well-maintained felts keep the press at peak water-removal efficiency.

3. Mechanical-first dewatering Maximizing mechanical removal cuts dryer load by 20–30%, saving energy per part.

The Result: Less water, less energy

With an optimized press, the dryer does less work and cycles run faster. Mechanical dewatering costs far less per liter than evaporation, so this single lever cuts cost across the line.