The production line operates on the principle of counter-flow hot air circulation drying. A feeding system at one end continuously and uniformly feeds the plywood to be dried into the drying tunnel. The boards move slowly through the tunnel via a conveying system (e.g., rollers, mesh belts, or carts). Simultaneously, high-temperature hot air generated by a heating system (hot air stove, steam heat exchanger, thermal oil boiler, etc.) is blown into the tunnel in the opposite direction to the movement of the boards.

This "counter-flow" design ensures the hottest air meets the driest boards about to exit, fully utilizing the thermal energy of the air. Conversely, more humid, cooler air contacts the wet boards just entering, facilitating moisture evaporation. The humid air is partially expelled by the dehumidification system, while most is recirculated and reused, significantly reducing energy consumption. The entire process—temperature, humidity, air velocity, and board speed—is precisely controlled by a central intelligent control system.

A complete production line mainly consists of the following systems:

1.  Feeding System: Includes automatic loaders, lift tables, and feed conveyors to ensure boards enter the drying tunnel continuously and smoothly.

2.  Drying Chamber Main Body (Tunnel): A sealed channel constructed with high-quality insulation panels (e.g., rock wool, polyurethane) to minimize heat loss and ensure a stable internal thermal environment.

3.  Heating System: The core energy source of the equipment. Options based on client conditions:

      Hot Air Stove: Uses wood waste (bark, sawdust) as fuel, economical and environmentally friendly, most widely used.

      Steam Heat Exchanger: Suitable for factories with boiler steam, provides stable temperature.

      Thermal Oil Boiler: High thermal capacity, allows for precise temperature control.

      Electric or Gas Heating: Clean, but higher operating costs.

4.  Hot Air Circulation System: Comprises high-power centrifugal fans, ducts, and nozzles. It distributes hot air evenly and at high velocity onto the board surfaces, breaking the boundary layer and accelerating moisture evaporation.

5.  Conveying System: Roller tracks or mesh belts running through the entire tunnel, driven by variable frequency motors. The speed is adjustable to control drying time.

6.  Dehumidification (Moisture Exhaust) System: Controlled automatically by exhaust fans and dampers. It expels moist air based on data from internal humidity sensors to maintain drying potential.

7.  Discharge System: Receives the dried boards and automatically stacks or conveys them to the next process.

8.  Intelligent Control System: The brain of the production line. Uses PLC + touch screen control, allowing pre-setting and storage of various drying curves. It monitors parameters like temperature, humidity, and speed in real-time, enabling fully automated operation with automatic fault alarms.

We are Shandong MINGHUNG Wood Based Panel Machinery Co.,Ltd China factory and manufacturer of full sets of Plywood machinery and Veneer machinery. With many years production experience, advanced production technology,experienced workers and professional engineers, we can offer you the suitable, good and strong machinery for you.

Machines include:Veneer production line(Log debaker,Veneer peeling machine, Log loader,Automatic stacker)，Blade sharpener,Veneer patching machine,Veneer dryer machine(Veneer roller dryer, Veneer mesh dryer, Veneer press dryer), Veneer gluing machine,Plywood lay-up machine, Veneer jointing machine, Plywood cold press, Hot press machine,Plywood edge trimming cutting machine, Sanding and calibrating machine, Plywood overturn machine, Lift table, and so on.