Ⅰ.Plywood

Plywood is a composite wood panel made by bonding three or more thin wood veneers with adhesive under heat and pressure. The key principle is cross-grain lamination – alternating the wood grain direction of adjacent layers to neutralize internal stress and enhance stability.

Structural Features  

Layered Structure: Odd number of layers (3/5/7+), high-grade veneer for surfaces, fast-growing wood for core.  

Grain Orientation: Adjacent veneers perpendicular to each other (orthogonal stacking).  

Symmetry: Matching veneer species, thickness, and moisture content on both sides of the core to prevent warping.  

Key Advantages  

✔ High Strength-to-Weight Ratio: Cross-lamination distributes load, outperforming solid wood.  

✔ Dimensional Stability: Resists warping/cracking, adaptable to humidity changes.  

✔ Material Efficiency: Compatible with lower-grade core wood, reducing raw material costs.  

✔ Eco-Friendly: 50% less timber consumption vs. solid wood.  

✔ Workability: Easy to cut, drill, and finish.  

Complete Production Process

1. Log Processing: Debarking → Steaming → Rotary/Plain Slicing (producing 0.3–4mm veneers).  

2. Veneer Drying: Kiln-drying to 8–12% moisture content (prevents glue failure/blistering).  

3. Gluing & Layup:  

   Core veneer coated with resin (UF/PF) on both sides.  

   Manual/semi-auto layup (cross-grain alignment).  

4. Pre-pressing: Cold pressing for initial bonding (prevents layer shifting).  

5. Hot Pressing:  

   Temp: 120–180℃ | Pressure: 1.5–3.0 MPa  

   Duration: ≈1 min per mm thickness (e.g., 18min for 18mm board).  

6. Trimming & Sanding:  

   Edge-cutting to standard sizes (e.g., 1220×2440mm).  

   Calibrated sanding (precision: ±0.1mm).  

7. Grading & Packaging: Sorting (A/AA/AAA) → Labeling → Bundling.  

Application Scenarios

Cost-Effective Plywood Line Equipment

1. Log Peeler & Rotary Lathe  

Function:  

  Debarking → Steaming → Rotary-cutting logs into continuous veneer strips (thickness: 0.3–4mm adjustable).  

Economy Configuration:  

  Hydraulic drive (non-servo motor), 30% power saving.  

  Standard alloy blades (tungsten carbide optional, 2x lifespan).  

Specs:  

  Log diameter: Φ150–800mm  

  Peeling speed: 15–30m/min  

  Power: 22–45kW  

2. Veneer Dryer  

Function:  

  Dries wet veneer to 8–12% moisture content (prevents delamination during hot pressing).  

Economy Configuration:  

  Mesh-belt type (non-roller), heat source: coal/biomass.  

  Zoned temperature control (80–120℃), 20% energy saving.  

Specs:  

  Capacity: 3–8m³/shift  

  Belt speed: 0.5–5m/min adjustable  

  Energy consumption: ≤120kWh/m³  

3. Glue Spreader  

Function:  

  Applies UF/PF resin evenly on both sides of core veneers.  

Economy Configuration:  

  Double-roller coating (non-curtain type), glue spread accuracy: ±10g/m².  

  Heated glue tank (prevents gelation at low temps).  

Specs:  

  Coating width: 1300–2500mm  

  Spread volume: 120–280g/m² (adjustable)  

  Power: 5.5kW  

4. Manual Layup Station  

Function:  

  Workers assemble glued veneers in cross-grain alignment.  

Economy Configuration:  

  Scale-positioning baffles → Improve alignment accuracy.  

  Vacuum suction cups assist handling (reduces labor intensity).  

Efficiency:  

  Manual layup: 3–5 mins/sheet (1220×2440mm).  

5. Pre-press  

Function:  

  Cold pressing (0.8–1.2MPa) for initial bonding, prevents layer shifting in hot press.  

Economy Configuration:  

  Frame structure (non-four-column), pressure uniformity ≥85%.  

  Auto timer for pressing (2–5 mins).  

Specs:  

  Platen size: 1300×2500mm  

  Max pressure: 200 tons  

6. Multi-opening Hot Press  

Function:  

  Cures adhesive under high heat/pressure (core equipment).  

Economy Configuration:  

  8–12 openings (SME standard, daylight: 120mm).  

  Steam/thermal oil heating (biomass boiler compatible).  

  PLC auto-control (±2℃/±0.1MPa).  

Specs:  

  Press size: 1300×2500mm  

  Max temperature: 180℃  

  Max pressure: 3000psi  

  Closing speed: ≥30mm/s  

7. Trimming Saw  

Function:  

  Cuts rough-edged panels to standard sizes (e.g., 1220×2440mm).  

Economy Configuration:  

  Crosscut + rip saw combo.  

  Pneumatic hold-down rollers (cutting accuracy ±0.5mm).  

Specs:  

  Blade diameter: Φ350mm (carbide teeth)  

  Feed speed: 10–30m/min  

8. Wide Belt Sander  

Function:  

  Calibrates thickness & surface sanding (Ra≤3.2μm).  

Economy Configuration:  

  3-sand head (coarse + fine + polish).  

  Pneumatic pressure pads (adapts to uneven surfaces).  

Specs:  

  Sanding width: 1350mm  

  Removal capacity: 0.1–1.5mm/pass  

  Accuracy: ±0.1mm  

Economy Solutions:  

  Semi-automated layup (labor-assisted cost reduction)  

  8–12 opening hot press (mid-small capacity)  

  Optional biomass heating (30% energy savings)  

The production line can be arranged in a U-shaped layout (reducing the transportation distance by 30%), and the hot press machine is placed in the center (shortening the path of the hot plate transportation).

Small/Medium Production Line Scale

Output: 30–150 sheets/day (1220×2440mm standard)  

Factory Requirements:  

  Area: 800–1500m² (incl. raw material storage)  

  Clear Height: ≥6m (for hot press operation)  

Request a Quote Today! OEM/ODM solutions available – Start your plywood business with competitive edge!  

Our contacts:

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Email: osbmdfmachinery@gmail.com