Wood and Wood Derivatives (Wood Fiberboard Manufacture, Particleboard Manufacturing and Processing)

Description:

Wood  has been used for hundreds of thousands ofyears for both fuel and as a construction material. Wood is an organicmaterial, a natural composite of cellulose fibers (which are strong in tension)embedded in a matrix of lignin which resists compression. In the strict sensewood is produced as secondary xylem in the stems of trees (and other woodyplants). Wood is used for millennia for many purposes, primarily as a fuel oras a construction material for making houses, tools, weapons, furniture,packaging, artworks, and paper. Wood is composed of cells, and the cell wallsare composed of micro fibrils of cellulose and hemicellulose impregnated withlignin. The derivation of chemicals from wood is carried out wherever technicalutility and economic conditions have combined to make it feasible. In a livingtree it performs a support function, enabling woody plants to grow large or tostand up for themselves. It also mediates the transfer of water and nutrientsto the leaves and other growing tissues. Wood may also refer to other plantmaterials with comparable properties, and to material engineered from wood, orwood chips or fiber. Wood and man have coexisted on this planet from thebeginning and wood, as a renewable resource, has provided man with tools,weapons and shelter. Wood, when dry, has unique physical properties in that itstensile strength, bending strength, compression strength, impact resistance andhardness per unit weight are the highest of all construction materials.

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