Automatic Multi-Layers Metal Dryer
This is the pulp making process animation video made for customers, watch and learn the pulp preparation process in papaer egg tray production, contact us if you have any questions or needs.
The pulp-molded paper trays are directly transferred from the pulp mold dies to a 6-layer metal dryer for continuous drying. This metal dryer has following advanced features:
- Integrated Pre-Drying Zone – Immediately receives wet trays with hot air circulation synchronized from the molding section.
- Multi-Layer Conveyance – Six-tiered stainless steel mesh belts ensuring 17–18 minutes total drying time.
- Thermal Efficiency Design – High-density mineral wool insulation minimizing heat loss.
- Advanced Airflow System – Uniquely engineered centrifugal fans with automatic dehumidification enabling forced convection, rapidly removing moisture.
❓Q1: What is the difference between single-layer and multi-layer?
A:
- Space efficiency: The 6-layer vertical structure reduces space by 60% (compared to a single-layer drying line), making it suitable for factory space constraints.
- Drying uniformity: Each layer is independently temperature-controlled (±2 °C ) to prevent heat deformation of the tray (especially edge warping).
- Energy consumption optimization: hot air circulates from top to bottom, waste heat is utilized layer by layer, and energy consumption is 35% lower than that of a single layer.
❓Q2: What factors can influence the total drying time?
A: Key parameters:
- Belt speed: 0.8–1.2 m/min (adjustable)
- Hot air temperature: 130–150 °C (depending on pulp thickness)
Time extension factors:
- Pallet thickness > 3mm → +2–3 minutes
- Initial moisture content > 65% → +1–2 minutes
❓Q3: How does the dehumidification system work?
A: 3-stage dehumidification:
- Condensation dehumidification: The inlet wet air is cooled to below the dew point to extract water;
- Rotary wheel adsorption: silica gel rotor deep dehumidification (dew point ≤ -20 ℃ );
- Regeneration cycle: A small amount of hot air (about 10%) heats the rotor to remove moisture.
Control accuracy: ±5% RH (measured moisture content fluctuation ≤0.8%).
