Wood Quality - Definitions

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Presentation transcript:

Wood Quality - Definitions A measure of the aptness of wood for a given use. A measure of the characteristics of wood that influence the properties of products made from it. A changeable attribute that is characterized by a dynamic balance among intrinsic properties, economic value and consumer satisfaction over a period of time. The resultant of physical and chemical characteristics possessed by a tree or part of a tree that enables it to meet the property requirements for different end products. In other words, the intrinsic quality of wood evaluated solely in terms of its suitability for various products or end uses.

Forestry Management Options Tree Growth Wood Properties influences determines determines influences Forestry Management Options Tree Growth Wood Properties Technical Performance Acceptance For End Use influences influences Size Cost of management and silviculture influences influences Price

* Foresters’ Growth Wood Technical Options Characteristics Properties Performance Cultivate a) Stem form 1. Density Strength Irrigate (i) size 2. Texture Drying behaviour Fertilize (ii) straightness Improve stock (iii) taper 3. Grain direction Stability in service Planting distance b) Branching 4. Knot size and number Sawing and machining Juvenile space Thin c) Ring structure 5. Fiber characteristics Mechanical fastening Prune (i) juvenile wood d) Spiral grain Uniformity Choose rotation age (ii) reaction wood Decay resistance Treatability

* Wood properties 1. Density 2. Texture 3. Grain direction 4. Knot size and number 5. Fiber characteristics (i) juvenile wood (ii) reaction wood Technical performance Strength Drying behaviour Stability in service Machining Mechanical fastening Uniformity Decay resistance Treatability

* Growth characteristics (a) Stem form (b) Branching (i) size (ii) straightness (iii) form (b) Branching (c) Ring structure (d) Spiral grain Wood properties 1. Density 2. Texture 3. Grain direction 4. Knot size and number 5. Fiber characteristics (i) juvenile wood (ii) reaction wood

Wood Quality wood density uniformity of growth rings % heartwood fibre length % reaction wood % juvenile wood knots grain straightness