Woods

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What is the general structure of woods?
Fibrous composite made up of plant cells and natural resins
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What are the properties of wood
Good compressive strength; better tensile strength along the grain (composite structure); Thermal and electrical insulator
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What is blockboard and what are the main uses?
This is built up with a core of softwood strips bonded together with adhesive and covered with a sheet of plywood on either side. Used as a building material and for furniture manufacture including fitted kitchens / bedrooms.
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What is chipboard and what are the main uses?
This is made up of small chips of wood bonded together with resin and formed into sheets by compression. It is not as strong as plywood and block board but it is not expensive. Chipboard is often covered with a plastic laminate or wood veneer
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What is hardboard and what are the main uses?
This is made from wood fibres that have been pulped. The pulp is put under pressure until the fibres bond to produce a tough board that is smooth on one side and rough on the other. It is not as strong as the other boards
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What is MDF and what are the main uses?
A quality board, relatively cheap. This board is composed of fine wood dust and resin pressed into a board. This material can be worked, shaped and machined easily. Paint can be applied to it without the need for an undercoat or primer.
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What is plywood and what are the main uses?
This is made from veneers (plies) of timber with each grain layer being at right angles to each other and bonded together by resin and pressure.
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What is sterling board and what are the main uses?
is made from softwood strands compressed and glued together with exterior grade, water-resistant resins. It is easily recognisable because of the irregular pattern of flattened, softwood strands that make up the surface.
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What is hardwood?
Timbers that are deciduous and slow growing and are hard and more difficult to shape this is not the case
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What is softwood?
Timbers that are evergreen and quick growing and are soft and easy to cut and shape
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What is Pine?
Is a relatively cheap softwood wood used in the building trade and for furniture. It is pale in colour, quite easy to cut and shape, and machines relatively well.
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What is Mahogany?
Is quite expensive and is used for good quality furniture and hardwood windows. It is light brown in colour and more difficult to use compared to pine.
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What is Oak?
This is an expensive material and is used in for making quality, expensive furniture. Steel fittings such as hinges will stain oak so it is important to use brass ones.
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What is Teak?
A hardwood that contains oils which means it is resistant to decay. This is often used to make garden furniture or for wood block flooring.
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What is meant by deciduous?
a general term used to describe trees that lose their leaves in autumn
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What is meant by evergreen?
A general term used to describe trees that do not lose their leaves in autumn
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What is meant by grain?
The visual effect of the flow of the tracheids
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What are Tracheids?
The cells of wood
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What is meant by Lignin?
The natural resins that hold the cells together in timbers
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What is meant by Knots?
Natural defects found in timber -the start of branches from the trunk
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What is conversion?
Sawing up logs to provide useable wood forms
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What is meant by slab sawn?
A form of conversion where the trunk of the tree is cut into slabs -more prone to warping
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What is meant by quarter sawn?
A form of conversion that can prevent warping and can be used to enhance the grain
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What is meant by splits?
Separation of timber fibers along the grain due to rate of drying
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What is shrinkage?
All timbers shrink due to moisture lost in seasoning
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What is moisture content?
the amount of "water" in the timber. Usually shown as percentage of volume
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What is twisting?
A form of warping that is due to a combination of a method of conversion (sawing the trunk of a tree) and uneven seasoning
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What is rot?
The breaking down of the lignin resins in woods that can hold the traicheds (cells) together
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What is deathwatch beetle?
Insect responsible for the destruction of mainly hardwoods, eюпю oak-frame buildings;churches and barns can also be affected
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What is meant by decay?
The deterioration of woods
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What is kiln drying?
A form of seasoning that uses steam in a controlled way to reduce the content of moisture in timber
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What is a venner?
A thin section of timber (usually hardwood) that is glued to a cheaper base material, e.g. chipboard or block board
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Other cards in this set

Card 2

Front

What are the properties of wood

Back

Good compressive strength; better tensile strength along the grain (composite structure); Thermal and electrical insulator

Card 3

Front

What is blockboard and what are the main uses?

Back

Preview of the front of card 3

Card 4

Front

What is chipboard and what are the main uses?

Back

Preview of the front of card 4

Card 5

Front

What is hardboard and what are the main uses?

Back

Preview of the front of card 5
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