7072755
Descrição
FlashCards por Alex Naylor, atualizado more than 1 year ago
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Criado por Alex Naylor
quase 8 anos atrás
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| Questão | Responda |
| Wood | A natural composite used as a structural and decorative material. |
| Hardwood | Timbers that are deciduous and slow growing. |
| What hardwoods are there? | Oak, ash, beech, sycamore, willow, walnut, yew, teak, cedar, mahogany. |
| Softwood | Timbers that are evergreen and quick growing. |
| What softwoods are there? | Scots pine, larch, spruce, Douglas fir. |
| Deciduous | A general term used to describe treess that lose their leaves in autumn. |
| Evergreen | A general term used to describe trees that do not lose their leaves in autumn. |
| Grain | The visual effect of the flow of tracheids. A wood is stronger when tension is placed across the grain rather than along it and it can support a greater load. |
| Tracheids | The cells of woods. |
| Lignin | The natural resins that hold the cells together in timbers. |
| What is the structure of woods? | - All woods are fibrous with the fibres (or grain) growing along the length of the trunk or branch. - These fibres consist of cells (tracheids) of, mainly, cellulose supported by lignin resin. |
| Knots | Natural defects found in timber - the start of branches from the trunk. |
| Conversion | Sawing up logs to provide useable wood forms. |
| Slab Sawn | A form of conversion that can prevent warping and can be used to enhance the grain. |
| Which one is slab sawn and which one is quarter sawn? | |
| Splits | Separation of timber fibres along the grain due to rate of drying, tension or from natural events such as lightning strikes. |
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