The purpose of seasoning of timber is to remove
the excess moisture content in the wood to make
it suitable to be used for various purposes.
Excess moisture content of the wood can result
in uneven shrinkage, warping, twisting etc.
Advantages of Seasoning:
Wood becomes hard and durable.
The density of wood gets reduced and hence the
workability of wood is improved.
Defects like warping, twisting, splitting and
shrinkage do not occur.
Wood can be easily polished and painted.
Its resistance to fire, shock and stresses is
Methods of Seasoning:
Natural or Air Seasoning-
A platform is constructed on the ground and a shed is made on this
platform. The balks of timber are arranged in the shed in such a manner
that free circulation of air takes place through them. The balks are not
directly exposed to sunlight. To accelerate the rate of drying, the
balks are periodically turned upside down. Harder wood takes more time
to get dried as compared to softer wood. The time taken for seasoning
can be from 1 to 5 years depending upon the type of wood.
Water Seasoning- To remove the sap of the wood,
the timber balks are immersed in flowing water for 2 to 3 weeks. The
water takes the sap of the wood with it. The timber is taken out of
water and its air seasoning is done by keeping it on a tapered platform.
Artificial or Kiln Seasoning-
It is the quickest process to dry the wood. The timber balks are
arranged on big trolleys to drive them to oven or kiln. The timber balks
in kiln are kept under controlled conditions of temperature and
humidity. The wood obtained by this method is of inferior quality as
compared to natural seasoning. The capital required is also more as
compared to other methods.
Other methods like Electrical and Chemical Seasoning are also used for
seasoning of timber.