Slide 2:
Special seasoning methods
Various methods :
Various methods High temperature drying
Chemical seasoning
Solvent seasoning
High frequency drying
Vapour drying
Vacuum drying
Boiling in oil
High temperature drying :
High temperature drying Process consists-wood loaded in metallic chamber
Steam apply 100°c
Super heated steam drying
Time-1/4th to 1/5th of kiln seasoning
Species:
softwood species in canada & europe
Chemical seasoning :
Chemical seasoning Consists-apply of hygroscopic (or) antishrink chemicals
Green timber soaked in chemical water
To allow absorption up to 1/10th of total thickness of sawn timber
Chemical maintain moisture to reduce cracks
Chemicals:
common salt in US,urea,polyethylene glycol
Solvent seasoning :
Solvent seasoning Timber sacked vertically-vapour tight chamber
Heated water miscible organic compound
It circulated over the timber using pump
Solvent absorbs moisture & extractives
Extractives distilled to recover solvent
Solvent:
Acetone
High frequency drying :
High frequency drying Wood kept in high electric field
Creates high temperature above 100°c
This method used for drying small sized non-refractory wood
Slide 8:
Vapour drying
Drying-vapour produced by boiling water miscible organic solvent like xylene-temp up to 149°c
Vacuum drying
Green wood placed in chamber heated under vacuum
Boiling in oil
Rapid drying by submerging in hot oil
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