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Plywood process flow chart
443
Maritime pine plywood production flow
Inspired by Thebault factory
Peeling
Crosscutting
Log sorting and conditionning
Steaming
Debarking
- Good quality logs : around 2.7m length
- Low quality logs : around 1.3m length
- 3D scanning to place the chucks at the best place
- From 1 to 3 mm
- Rake angles : around 70°
Sharpness angles : around 20°
- Bark is removed to avoid hard objects during the peeling, and protect knifes
- Not always, just for thick veneer or if the logs are frozen
- Time : depends on the diameter
-Separation of good quality logs (to make plywood faces) and low quality logs (cuved, short... to make shorter lengths)
Drying and sorting
Panel sizing
Hot pressing
Gluing and lay-up
Defects cutting and veneer clipping
Pannels are sizing to commercial size and 90° angles are made
Typical sizes : 2.0-2.05x1.0-1.25
Belt dryers
moisture content reduced to 6 to 12%
Beginning : 100-150 ° Then : cooler
High air speed : 1000-1500m/min
After : grading according their quality (face or interior quality)
- Applying adhesives with a curtain coating
Grammage : 140 to 240 g/m2 per face
- Veneer are placed into perpendicular direction and odd number with an automatic machine
-oven that heats up o 145° and pressed at 12 kg/cm2
-1'30 for each millimeter of panel thickness
- Stamping out defects (knot, bark...) with a standard size punch filled with a patch (jointed with adhesive tape)
- Veneer clipping
Overlaying
Machining
Trimming, Edge sealing
Re-sized to commercial size or specific size
Edges can be protected by a treatment or overlayed like their faces
sometime done for special type of plywood : aesthetic panel, non-slip panels...
Sanding and grading
Sorting and Packaging
Panels are sanded to ensure panel calibration
Packages sorted by type and quality and are protected to be sended
Simon Trovalet - ESB 81