Plywood Mesh Belt Dryer with one-Stop Service for Installation & Training
Plywood mesh belt dryer, also known as the mesh belt veneer dryer, is one of the core equipment used for drying veneer in plywood production. Together with the veneer lathe and the hot press, it is known as one of the “three major machines” in plywood production.
In the plywood manufacturing process, freshly peeled veneer typically has a moisture content as high as 50% to 80% and cannot be directly used for plywood production. If high-moisture-content veneer is directly glued and hot-pressed, bubbling may occur, the plywood may easily become degummed and deformed, and cracks may appear on the surface.Therefore, freshly peeled veneer must undergo a drying process to reduce its moisture content to 8%–14%, meeting the subsequent process requirements for plywood production.
The mesh belt dryer is a continuous drying equipment that reduces the moisture content of veneer in an economical manner with minimal material loss.It uses two (or multiple) layers of metal mesh belts to hold and transport the veneer, and rapidly evaporates the moisture in the veneer through high-speed jetting hot air, achieving continuous veneer drying.
The plywood mesh belt dryer adopts a scientific drying principle, combining convective drying and heat conduction. Its core working process is as follows:
Stage 1: Preheating. The veneer, held between the upper pressing rollers and the lower mesh belt, first passes through the preheating zone, where the temperature of the veneer gradually increases in preparation for subsequent rapid drying.
Stage 2: Drying. Hot air generated by a hot air furnace, steam, or thermal oil heat exchanger is injected into the upper and lower air boxes inside the dryer. The hot air is jetted at high speed by circulating fans, perpendicularly onto the upper and lower surfaces of the moving veneer.The pressure of the jetted air is sufficient to break through the saturated water vapor layer formed on the surface of the veneer, allowing heat to enter the interior of the veneer smoothly while rapidly expelling moisture.This principle fundamentally overcomes the problem of heat transfer being hindered by the water vapor layer in traditional drying methods, greatly accelerating the drying speed.
Stage 3: Cooling. After drying, the veneer is at a high temperature. It enters the cooling zone, where a cooling fan draws in outdoor cold air that passes transversely through the cooling chamber, rapidly cooling the dried veneer to prevent warping and deformation caused by thermal stress.The cooled veneer is flat, has uniform moisture content, and exhibits significantly improved drying quality and efficiency.
It is worth noting that the hot air circulation mode significantly affects the drying performance. Mesh belt dryers typically use a transverse circulation vertical jetting method, where hot air is jetted at high speed perpendicular to the veneer surface. Compared with traditional longitudinal circulation methods, this design provides faster drying speeds and more uniform heating of the veneer.
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1. Transmission System. Mainly operates in the transmission chamber. The veneer enters the machine here, and through relative rotation, it is simultaneously pressed and moved forward, ensuring that the dried veneer is smooth and flat.The transmission system typically uses a variable-speed device to control the mesh belt speed, allowing flexible adjustment of the feeding speed according to veneer thickness and moisture content to achieve ideal drying results.
2. Mesh Belt System. The mesh belt is usually made of 304 stainless steel to prevent rust contamination of the veneer. The number of mesh belt layers can be configured from 1 to 4 according to production needs, with 2 or 3 layers being common. The special flattened-wire structure and precision manufacturing process of the mesh belt ensure the flatness of the dried veneer.To prevent belt misalignment, high-performance dryers are also equipped with automatic mesh belt guiding devices.
3. Heating System. Mainly includes radiators and a hot air circulation system. Heat sources can include hot air furnaces, thermal oil, steam, or far-infrared heating.The radiators have large heat dissipation areas and high thermal efficiency. The radiators are arranged in stages according to the temperature, humidity, and moisture content of the veneer, thereby saving energy.
4. Circulating Air System. Driven by circulating fans, hot air is jetted at high speed from the air boxes, acting perpendicularly on the veneer surface. The reasonable arrangement of circulating air ensures uniform heating of the veneer, effectively preventing deformation and cracking.
5. Control System. Adopts centralized electrical control with variable-speed adjustment function, allowing flexible speed regulation according to the veneer drying condition. Advanced equipment is also equipped with online temperature/humidity monitoring and automatic adjustment systems, achieving precise control of the drying process.
6. Cooling System. Composed of cooling fans and cooling chambers, used to rapidly cool the high-temperature veneer after drying to 30–40°C, preventing thermal deformation in subsequent processes.
The main technical parameters of plywood mesh belt dryers vary by model and specification. Typical parameter ranges are as follows:
Parameter | Typical Range |
Working Width | 1300–4200 mm |
Number of Mesh Belt Layers | 1–4 (commonly 2–3) |
Mesh Belt Speed | 1–30 m/min (stepless adjustable) |
Drying Thickness Range | 0.2–4 mm |
Drying Temperature | 140–180 °C |
Heating Medium | Steam, thermal oil, hot air |
Steam Pressure | 0.4–1.0 MPa |
Initial Moisture Content | 50%–80% |
Final Moisture Content | 8%–12% |
Drying Capacity | 0.5–4 m³/h |
Total Installed Power | 13–107 kW |
The mesh belt veneer dryer is mainly used for drying various sliced veneers or rotary-cut veneers. It is typically connected with veneer slicers, veneer lathes, and other equipment to form a complete production line for sliced veneer or rotary-cut veneer processing.It is suitable for use by large-scale producers of sliced veneer, plywood processing, and other manufacturing enterprises.
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veneer peeling machine
We are Shandong MINGHUNG Wood Based Panel Machinery Co.,Ltd China factory and manufacturer of full sets of Plywood machinery and Veneer machinery.
The machinery we produce includes peeling machines, chipping machines, rotary cutting machines, drying machines, gluing mixers, laying machines, pre-pressing machines, hot pressing machines, cooling machines, longitudinal and transverse sawing machines, sanding machines, as well as auxiliary machinery such as automatic feeding and discharging systems and lifting platforms.
1. Customer provides panel specifications and capacity requirements.
2. We provide a solution and quotation.
3. Contract signed, production arranged.
4. After shipment, engineers are dispatched for on-site installation and commissioning.
5. On-site training until the customer can operate independently.
6. Long-term technical support and spare parts service.
