Modified Wood

Wood, Modified

 

wood that has been processed by some chemical substance (synthetic resin, ammonia, and so on) to improve its mechanical properties and impart water resistance to it. In most cases the wood is impregnated under pressure; polymerization or polycondensation of the chemical substances introduced into the wood (mers, oligomers, and others) is brought about by heat treatment or by irradiation with X rays and alpha, beta, and gamma rays in the presence of catalysts. Modified wood has 75 percent greater resistance to static bending than natural wood; it absorbs 3-5 times less water and is less susceptible to abrasive wear by a factor of 1.5-2.0. Modified wood is used to manufacture sliding bearings in units of farm machinery, parts that operate in aggressive mediums, and casting patterns and master forms.

REFERENCES

Rogovin, Z. A. Khimicheskie prevrashcheniia i modifikatsiia tselliulozy. Moscow, 1967.
Modifikatsiia drevesiny (collection of articles). Riga, 1967.

A. KALNIŅŠ

References in periodicals archive ?
Boron was evaluated for its potential to provide supplemental insect and fungal resistance to the thermally modified wood, while glycerol was evaluated for its ability to accelerate the thermal modification process.
The specs of this modified wood equal the properties of tropical hardwood and therefore form an attractive alternative to hardwood and other construction materials with a negative environmental impact.
Physical and biological properties of modified wood before and after weathering.
On branches and stems, both galls and burls result in modified wood tissue due to excessive cell division and enlargement.
Another option is thermally modified wood treatments that make lumber less tempting for insects and fungi.
Which due to its specific requirements increased relative humidity in the room where it is used, inactivity planed surface of thermally modified wood, the internal structure of other species, and more numerous secondary factors that significantly affect the quality of glue bond.
The increased hydrophobic character of modified wood was revealed from high advancing contact angles of water.
2013) Modified wood surface properties by electron beam irradiation.
A[cedilla] Till the end of the project this new thermally modified wood will be available in all Europe market and will offer a high quality, ecological and convenient solution.

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