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Plywood process flow chart

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by

Simon Trovalet

on 13 October 2015

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Transcript of Plywood process flow chart

Maritime pine plywood production flow

Log sorting and conditionning
-Separation of good quality logs (to make plywood faces) and low quality logs (cuved, short... to make shorter lengths)
Debarking
- Bark is removed to avoid hard objects during the peeling, and protect knifes
Steaming
- Not always, just for thick veneer or if the logs are frozen
- Time : depends on the diameter
Crosscutting
- Good quality logs : around 2.7m length
- Low quality logs : around 1.3m length
Gluing and lay-up
- 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
Peeling
- 3D scanning to place the chucks at the best place
- From 1 to 3 mm
- Rake angles : around 70°
Sharpness angles : around 20°
Drying and sorting
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)

Defects cutting and veneer clipping
- Stamping out defects (knot, bark...) with a standard size punch filled with a patch (jointed with adhesive tape)
- Veneer clipping
-oven that heats up o 145° and pressed at 12 kg/cm2
-1'30 for each millimeter of panel thickness

Panel sizing
Pannels are sizing to commercial size and 90° angles are made
Typical sizes : 2.0-2.05x1.0-1.25
Machining
Re-sized to commercial size or specific size
Overlaying
sometime done for special type of plywood : aesthetic panel, non-slip panels...
Sanding and grading
Panels are sanded to ensure panel calibration
Hot pressing
Trimming, Edge sealing
Edges can be protected by a treatment or overlayed like their faces
Sorting and Packaging
Packages sorted by type and quality and are protected to be sended
Inspired by Thebault factory
Simon Trovalet - ESB 81
Full transcript