Veneer Drying System for Improving The Quality of Plywood

• Customization: Available
• After-sales Service: 1 Year
• Warranty: 1 Year
• Model NO.: MINGHUNG
• Movement Way: Combined
• Heating Mode: Transmission
• Operation Pressure: Atmospheric Pressure
• Operational Method: Continuous
• Name: Veneer Dryer Machine
• Automatic: Automatic
• Certification: CE, ISO
• Size: 32*7.5*4.7m
• Transport Package: Plastic Film and Wooden Box
• Trademark: MINGHUNG
• Origin: China
• HS Code: 841939
• Production Capacity: 300sets/Year
• Package Size: 3200.00cm * 750.00cm * 470.00cm
• Package Gross Weight: 120.000kg

Product Description

Veneer drying system for improving the quality of plywood

The Mesh Belt Veneer Dryer, also known as a Multi-Deck Conveyor Dryer, is a precision drying system that utilizes multiple layers of stainless steel mesh belts as a conveying medium to dry veneer in a flat, through-air circulation manner within an enclosed chamber. It represents the mainstream direction for high-quality veneer drying, especially suited for applications with stringent requirements on flatness, drying uniformity, and final moisture content (MC) control.

Core Components

1.  Conveyance System:

       Multi-Layer Mesh Belts: Typically consists of 2 to 5 layers (customizable) of heat-resistant, high-strength woven stainless steel wire belts, serving as the "moving bed" that carries and transports the veneer.

       Drive Unit: Includes motor, reducer, sprockets, and chains, providing smooth, variable-speed drive to the belts.

       Tensioning & Tracking Mechanism: Ensures constant belt tension and automatically corrects lateral drift, preventing veneer from falling or getting damaged.

 

2.  Drying Chamber:

       Casing Structure: Constructed with modular insulated panels (stainless steel inner liner, rock wool insulation core) forming a sealed tunnel-like drying space with minimal heat loss.

       Access Doors & Viewing Windows: Facilitate maintenance and visual inspection of the drying process.

3.  Hot Air Circulation System (The Core):

       Heating Unit: Options include steam heat exchangers, thermal oil heat exchangers, gas-fired hot air generators, or electric heaters, depending on client facilities.

       Circulation Fans: Each drying tier or zone is equipped with independent high-temperature resistant, high-power centrifugal fans, crucial for generating forced airflow.

       Air Distribution System: This is the essence of the mesh belt dryer. It comprises precisely engineered upper and lower air plenums and nozzles (or grilles) that ensure hot air perpendicularly and uniformly penetrates through the veneer sheets from both top and bottom surfaces, enabling highly efficient heat and mass transfer.

4.  Ventilation & Moisture Exhaust System:

       Exhaust Fans & Dampers: Intelligently control the rate of humid air exhaust based on the drying stage to maintain drying potential.

       Fresh Air Intake: Introduces a controlled amount of fresh air to maintain the quality of the circulating hot air.

5.  Intelligent Control System:

       Control Core: PLC (Programmable Logic Controller) or Industrial PC.

       Human-Machine Interface (HMI): Color touchscreen for setting and monitoring all parameters.

       Sensors & Instruments: Online moisture detectors, multi-point temperature & humidity sensors, pressure sensors, etc.

       Actuators: Frequency inverters (for fan and belt speed), electric control valves (for steam/hot air flow), etc.

       Functionality: Enables zonal and staged precise control of temperature and humidity. Capable of storing hundreds of drying schedules (curves) optimized for different wood species and thicknesses.

Working Principle

Its operation follows the principle of "Flat Conveyance, Vertical Through-Air, Sectional Drying":

1.  Feeding: Wet veneer sheets are continuously and evenly laid flat onto the head of the topmost mesh belt by a feeder.

2.  Tiered Drying: The veneer moves slowly forward with the belt. On each tier or within each independent drying zone, the top and bottom circulation fans force heated air through the nozzle system to create a vertical, high-velocity, and uniform airflow that penetrates the veneer stack. This rapidly removes moisture from both surfaces of the veneer with high efficiency.

3.  Inter-Tier Transfer: Upon reaching the end of a tier, the veneer is smoothly and orderly transferred to the mesh belt of the next tier via a special "turnover device" or "drop-through mechanism." During this transfer, the veneer may be flipped or reoriented, which helps correct minor warping and ensures two-sided drying consistency.

4.  Sectional Control: The drying chamber is divided into several zones along its length (e.g., preheating zone, main drying zone, conditioning zone). Temperature, humidity, and air speed in each zone can be set and controlled independently. For instance, the inlet zone uses lower temperature and higher humidity to prevent checking, the main zone uses higher temperature and lower humidity for rapid dehydration, and a conditioning treatment may be applied near the outlet to balance internal stresses.

5.  Discharge: After drying on the final tier, the veneer, having reached the target MC, is discharged from the dryer's end for the next processing step.

 

right elevation

left elevation

front elevation

Technical Specifications

(Custom configurations available upon request.)

Parameter	Description & Typical Range
Number of Mesh Belts (Tiers)	Common: 3-5 tiers. More tiers increase capacity for a given dryer length or allow a shorter dryer for a given capacity.
Effective Belt Width	Common: 1300mm, 2500mm, 2800mm, etc., or customized to match client‘s lathe width.
Number of Drying Zones	Typically 3-6 or more independently controlled zones. More zones allow finer process control.
Heating Method	Steam (common, 0.4-1.3MPa), Thermal Oil (180-220°C), Gas, Electric, etc.
Maximum Design Temperature	Usually 120°C - 200°C, depending on heat source and drying schedule.
Veneer Thickness Range	Broad, typically 0.5mm - 6.0mm.
Capacity	Calculated based on water evaporation per hour or square meters of wet veneer input, determined by initial and target MC.

Advantages of MINGHUNG Dryer

1.  Superior Drying Quality:

       Best Flatness: Veneer remains flat throughout the process. Combined with gravity and uniform airflow, this minimizes warping, distortion, and checking – resulting in paper-flat dried veneer.

       Excellent Uniformity: Vertical through-air circulation ensures consistent drying rates across the veneer thickness and sheet area, leading to even final MC distribution.

       Low Damage Rate: The gentle conveying method (no tumbling or impact) is especially suitable for valuable thin veneers and face veneers prone to damage.

 

2.  Precise Controllability:

       High Process Flexibility: Allows precise setting and replication of optimal drying schedules (temperature, humidity, time curves) for different materials, enabling "gentle drying."

       Accurate Endpoint Control: Coupled with online MC detection, it allows for high-precision control of the drying endpoint.

 

3.  High Efficiency, Automation & Integration:

       Continuous Automated Production: Easily integrated with upstream/downstream equipment (e.g., lathes, clippers, splicers, stackers) to form a fully automatic veneer processing line, significantly reducing labor.

       Traceable Production Data: All drying parameters can be logged and stored, providing a data foundation for quality analysis and process optimization.

3D Drawings 

Typical Applications

   Drying precious wood face veneers for high-end furniture (walnut, oak, cherry, etc.).

   Drying film-faced veneers for concrete formwork, which demand extreme flatness.

   Drying thick veneers for LVL (Laminated Veneer Lumber) production, requiring low-stress drying.

   Plywood production lines for export-grade products with strict standards on final MC uniformity.

   High-quality, large-scale continuous drying of standard veneers.

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