More than 5000 products such as cellulose, varnishes, alcohol, synthetic fibres, sugars, plastics, adhesives, oils, dyes, soaps, inks, fodder, medicines, disinfectants, explosives, boards, many of which are known since centuries ago, are prepared from wood. Specially new wood products with better quality and properties are recently seen in the field of board products and composite materials. The demand for wood material and the price are seen to be increasing by time.
Although wood material has many advantages with its unique properties compared with other materials, there are three deficiencies limiting its use:
a) Wood can be degraded by wood boring beetles, termites, wood destroying fungi and marine-borers because of its organic chemical structure.
b) Wood can absorp water molecules with its free hydroxyl groups and its absorbed water content depends on the relative humidity of the air. Accordingly, three dimentions of wood change differently depending on the moisture content of the medium.