Product Introduction
Veneer Dryer: Key Equipment in Veneer and Plywood Production
Veneer dryers are essential machinery in the production of veneer and plywood. The drying quality of veneer directly impacts the final product quality of overlay veneer and plywood. The design of continuous veneer dryers operates on the following core principles:
- Rapid Drying Technology
- Ensures flat, uniformly moisture-content veneer sheets post-drying
- Significantly improves both drying quality and efficiency
- Features direct heat transfer via high-temperature rollers contacting wet veneer
- Achieves high thermal efficiency (>85%) with minimal heat loss (<15%)
- Reduces energy consumption by 30-40% compared to conventional systems
- Drying Section Functionality
- Primary purpose: Heat veneer and evaporate moisture through recirculated hot air
- Moisture removal mechanism: Convective heat transfer from hot air (140-180°C) to veneer surface
- Production capacity correlation:
- Longer drying sections + higher conveyor speeds → Increased throughput
- Optimal for veneer thickness: 0.5-1.0mm+ (superior flatness vs. mesh-belt dryers)
- Heat Source Options
- Primary method: Steam heating (saturated steam at 1.0-1.6 MPa)
- Alternative methods:
- Direct combustion of coal gas, fuel oil, or wood residues
- Heat exchanger systems converting combustion heat to hot air
- Hot Air Circulation Systems
- Cross-flow ventilation: Air flows perpendicular to veneer travel direction
- Counter-flow ventilation: Air moves parallel but opposite to veneer movement
- Performance impact:
- Counter-flow systems improve drying uniformity by 25-30%
- Cross-flow systems offer simpler maintenance but lower efficiency
Advanced Drying Technology
Widely adopted domestically and internationally: High-temperature, high-velocity air jets (velocity: 30-50 m/s) are directed perpendicularly to both veneer surfaces, achieving:
- Breakthrough of the boundary layer on veneer surface
- 3-5× faster drying rates compared to traditional methods
- Enables continuous drying processes essential for industrial-scale production