How make mdf in factory?

1. Raw Material Preparation

• Factories typically use wood chips, sawdust, or waste from sawmills.
• Non-wood debris (dirt, stones, metal) is removed with cleaning systems.

2. Chipping and Defibrating

• Large wood pieces are reduced to small wood chips.
• Chips are softened with steam and then passed through a refiner to break them down into wood fibers.

3. Drying

• The fibers are dried in large flash dryers using hot air until they reach the correct moisture content (usually around 8–12%).

4. Resin and Wax Application

• Dried fibers are mixed with:
  • Urea-formaldehyde resin (the main binder).
  • Wax or paraffin (to improve water resistance).
• Sometimes fire retardants or other additives are added.

5. Mat Forming

• Fibers are laid on a conveyor belt into a thick, fluffy mat.
• The mat is pre-pressed to remove air and make the layer uniform.

6. Hot Pressing

• The mat passes into a multi-daylight hot press.
• High pressure (30–40 kg/cm²) and heat (160–180°C) cure the resin and compress the fibers into a dense board.
• This step determines the thickness and density of the MDF.

7. Cooling & Conditioning

• The hot boards are cooled gradually to stabilize them.
• Boards are stacked for several hours to equalize internal stresses.

8. Trimming & Sanding

• Edges are trimmed to standard sizes (e.g., 1220 × 2440 mm).
• Surfaces are sanded smooth for furniture, lamination, or painting.

9. Grading & Packaging

• Boards are graded for quality, thickness, and density.
• Bundled and packaged for shipping to furniture and construction industries.