Secador de rolo para contraplacado e secador de malha 2 em 1 (secador de contraplacado e folheado de face numa única máquina)

Plywood Roller dryer and Mesh Dryer 2 in 1(Plywood Core Veneer and Face Veneer Dryer)

• Largura de trabalho: 3 m

• Working decks: 4 (3+1) decks

• Heating Chamber Length: 22 sections × 2 m = 44 m

• Radiadores: 22 units

• Infeed Section (Head): 10 m (including lifting upper veneer rack, conveyor belt)

• Outfeed Section (Tail): 8 m (including lifting lower veneer rack, conveyor belt)

• Cooling Chamber Length: 4000 mm

• Driving Power: 7.5 kW × 3 = 22.5 kW; 7.5 kW × 1 = 7.5 kW

• Hot Air Fans: 15 kW × 22 = 330 kW

• Cooling Fans: 4 kW × 2 = 8 kW

• Exhaust Pipes: Intermittent type, 6 pcs, Ø300 mm

• Velocidade de alimentação: 1 – 30 m/min

• Meio de aquecimento: Thermal oil or steam

• Temperatura de secagem: 150 ℃

• Heat Consumption: 3,600,000 cal/h

• Roller Pitch: 183 mm

• Roller Diameter: Ø102 mm × 3 mm, material: carbon steel

• Roller Quantity:

  • Ø102 rollers: 1023 pcs

  • Infeed & outfeed rollers: 83 pcs

  • Ø76 rollers: 291 pcs

  • Ø89 rollers: 4 pcs

  • Ø219 rollers: 4 pcs

• Correia transportadora: Teflon

• Mesh Size: 5 × 5 mm

• Air Ducts: 1344 pcs

• Blowing Pipe Size: 3100 × 150 × 100 × 1.2 mm

• Estrutura principal: 3.75 mm laser-cut bending, bolted connection, material: carbon steel

• Dimensões da máquina: 66.45 m × 4.7 m × 4.0 m

• Insulation Door: Size as per main frame, thickness: 100 mm

• Multi-layer Feeder: 1 set

• Pit-free Lifting Platform: 4 sets

• Ground Roller Line: 3 m × 1.3 m, 2 sets

What Are the Plywood Face Veneer Drying Quality? 

• Thickness Range: 0.2–2.0 mm

Key Requirements:

1. No Cracks or Warping

   • Veneer is usually only 0.2–0.6 mm, much thinner than core boards, with fragile fiber structure.

   • Excessive temperature, strong airflow, or uneven heating can cause deformation or cracking.

   • Gentle heating and controlled temperature rise are required to prevent rapid moisture loss and breakage.

2. Conveying Method

   • Thin veneer has low strength; roller conveyors may cause folding, warping, or tearing.

   • Mesh-belt conveyors provide continuous support to keep veneer flat.

   • Teflon or metal mesh (aperture around 5×5 mm) allows hot air to penetrate from both sides for fast and uniform drying.

   • The tensioning system slightly stretches the veneer, minimizing ripples and edge curling.

3. Uniform Moisture Content

   • Moisture content should be controlled at 12 ±1%.

   • If too high (>12%): vaporization during hot pressing causes bubbles, delamination, or deformation.

   • If too low (<6%): veneer becomes brittle and prone to cracking.

4. Color Preservation

   • Excessive temperature may cause wood discoloration.

   • Veneer should retain its natural color after drying, with uniform tone and no scorching, darkening, or spotting.

5. Fast and Uniform Drying

   • Thin veneer, if dried too slowly, may darken, discolor, or mildew due to prolonged humidity.

   • Fast and uniform drying preserves veneer’s natural appearance, improves efficiency, and reduces mold risk.

   • Recommended feeding speed: 15–30 m/min.

What Are the Core Veneer Drying Quality?

• Thickness Range: 1.0–6.0 mm

Key Requirements:

1. Uniform Moisture Content (Internal and Surface)

   • Thick boards tend to have “dry outside, wet inside.” Strong hot-air circulation is required to remove internal moisture.

   • During hot pressing, if the core veneer’s interior is still wet while the surface is dry, adhesive cannot penetrate evenly, causing voids, bubbles, or delamination.

2. No Cracks or Warping

   • Thick veneers are prone to stress differences under high temperature.

   • Moisture reduction must be gradual to prevent internal stress from deforming the board.

   • If the surface dries faster than the interior, uneven shrinkage creates internal stress, levando a warping, waves, or twisting, which affects panel flatness and veneering quality.

3. Stable Final Moisture Content

   • The target moisture content should be 12 ±1%, and uniform throughout the board to ensure proper hot pressing and adhesive bonding.

4. Load-Bearing Support and Flatness

   • Core veneers are relatively heavy; rollers provide stable support during drying to prevent sagging or deformation.

   • The rollers can support heavy veneers, keeping them flat. Thick veneers have stronger fiber structures than face veneer, and light roller pressure ensures good surface flatness.

5. Longer Drying Time

   • Conveying speed is slow (1–10 m/min) because thick veneers retain moisture internally.

   • Longer residence in the drying chamber allows heat to gradually penetrate, ensuring uniform internal and surface moisture content.

   • Slow conveying ensures thorough contact with hot air, promoting even drying throughout the board.

How Our Dryer Make Face Veneer & Core Veneer Drying in One Dryer Machine?

1. Multi-layer Design

• Upper layers or specific sections are mainly for thin face veneer drying (fast, high airflow, low tension).
• Lower layers or sections are mainly for core veneer drying (high temperature, deeper heat penetration, adjustable speed).
• Each layer can independently control speed, temperature, and airflow, enabling dual-purpose drying in a single machine.

2. Independent Heating Zones

• The dryer is divided into multiple heating zones (e.g., preheating, strong drying, cooling), each independently adjustable:
  • Face Veneer zones → relatively lower temperature (to prevent scorching or deformation), high-speed hot air for rapid surface moisture removal.
  • Core Veneer zones → higher temperature (to ensure internal moisture removal), larger airflow with deeper penetration.
• This ensures thin boards dry safely while thick boards dry thoroughly.

3. Variable Feeding Speed

• Equipado com PLC smart control, operators can input drying parameters on a touchscreen, adjusting each zone’s target temperature, fan speed/airflow, and exhaust timing. The system monitors and automatically adjusts in real time.
  • Face Veneer → high-speed feed for rapid drying.
  • Core Veneer → slow feed for extended heating time.

4. Teflon Mesh Belt & Roller Support

• Veneer runs on a  mesh belt to prevent damage and wrinkling.
• Core boards run on rollers, which can support heavy boards and ensure flatness during drying.

Why Independent Temperature Zone Control is So Important in a Face Veneer & Core Veneer Dryer?

The most important feature in a two-in-one dryer is independent temperature zone control. The long heating chamber is divided into multiple zones, each independently adjusting temperature, airflow, and moisture exhaust, allowing both veneer and core board to receive the most suitable drying conditions within the same machine.

1. Sectional Heating Design

• The heating chamber is divided into multiple heating sections, not heated as a single unit.
• Each section has its own heater / hot-air duct / fan, equipped with temperature control valves.
• Operators can set different temperatures in each section based on veneer thickness and moisture content.

2. Independent Heating Source Regulation

• When using thermal oil or steam as the heating medium, each zone has separate inlet pipes with valves.
• By adjusting valve openings, the heat supply to each zone can be precisely controlled.
• Different zones can even have different heat-exchange areas, allowing for customized drying curves for veneer and core boards.

3. Multiple Fans for Each Zone

• Each zone is equipped with its own hot-air circulation fan.
• Airflow and pressure can be independently adjusted for different board thicknesses.
• For different drying requirements of veneer vs core board, multi-fan zoning enables precise control, combined with independent temperature and moisture exhaust:
  • Face Veneer zone → high-speed, lower-temperature airflow for rapid surface drying.
  • Core Veneer zone → large airflow, high penetration, higher temperature to ensure internal moisture removal.

4. Zoned Moisture Exhaust System

• Each temperature zone has an independent moisture exhaust port, preventing humidity from spreading throughout the entire dryer.
• Moisture generated in each zone is timely removed, preventing accumulation inside the chamber.
• Timely exhaust → hot air maintains effectiveness → improves thermal efficiency, shortens drying time, and reduces energy consumption.

Why Choose the Face Veneer & Core Veneer Dryer 2 in 1 Machine?

1. Reduced Investment Cost

• Traditionally, two separate dryers are required: one for face veneer and one for core veneers. Both machines are relatively expensive.

• A two-in-one dryer integrates both drying functions into a single machine, saving the cost of purchasing an additional dryer and reducing associated infrastructure expenses.

2. Space Saving

• A single machine completes both drying processes, simplifying production line layout and improving factory space utilization.

3. Lower Energy Consumption & Higher Efficiency

• Shared heating system (thermal oil or steam) is more energy-efficient than running two separate machines.

• Veneer and core board drying can flexibly switch according to production needs, improving machine utilization.

4. Reduced Maintenance and Spare Parts Cost

• One machine means fewer components, more centralized maintenance, and reduced spare parts inventory.

• Training and labor requirements are also minimized, lowering overall maintenance costs.