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DT > Chapter 2 Wood > Flashcards

Chapter 2 Wood Flashcards

1
Q

What should you consider when selecting woods in product design

A

Colour, grain, durability, outdoor use, ease of working, cost and commercial forms and sizes

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2
Q

What do you need to consider when it comes to colour

A

That it can change when exposed to light

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3
Q

What do you need to consider when it comes to grain

A

Grain pattern

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4
Q

What do you need to consider when it comes to durability

A

Hardwoods tend to be more resistant to scratching and have a longer life span

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5
Q

Forms and sizes of wood

A

•Sheet, rod, dowel, decorative mouldings
•rough sawn (used as originally cut without sanding or smoothing
•PAR- planned all round and sizes Available

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6
Q

Conditions in which hardwoods grow

A

From deciduous trees grown in warmer temperate regions

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7
Q

Conditions in which soft woods grow

A

From conifers grown in the cooler regions

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8
Q

Types of hardwood

A

Beach, oak, ash, mahogany,elm

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9
Q

Properties of a hard wood

A

Generally harder, darker in colour more decorative and expensive

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10
Q

Properties of beech

A

Hard, tough and strong, works and finishes well. Prone to warping, not durable outside, prone to attack from fungi. No taste or odour so used for kitchen utensils and child toys

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11
Q

Properties of oak

A

Very strong, heavy, durable, hard and though also finishes well. Contains and acid that corroded iron/ steel finishes. Used to make high class furniture and fittings

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12
Q

Properties of ash

A

Hard, dense, tough and very strong but elastic, high compressive and bending strength, great finishing qualities and machining qualities. Good resistance to shock and very stable hence why it’s used for bows and tool handles

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13
Q

Properties of mahogany

A

Straight grained reddish brown wood which is expensive and attractive. Prized for its beauty, durability and colour. Excellent workability and is tough, durable and resist wood rotting. Used for musical instruments and furniture

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14
Q

Properties of softwoods

A

Generally cheaper, lighter in colour and less expensive than hard woods

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15
Q

Types of soft woods

A

Pine, redwood, spruce

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16
Q

Advantages of manufactured boards

A

Availability, veneers can be applied, large stable sheets and uniform thickness and quality

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17
Q

Definition and properties of veneers

A

Applying a thin sheet of decorative wood onto a plain ground base. Used commonly on furniture. Makes materials more attractive.

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18
Q

Definition of ply wood

A

Formed using a odd number of thin layers with the grain of each running at right angles to its neighbour. Water proof glue is used to attach thin layers together

19
Q

Properties of plywood

A

High uniform strength, resistance to splitting, balance of stresses, no shrinking across the grain.

20
Q

What does MDF stand for

A

Medium density fibre board

21
Q

Definition of MDF

A

Is made from saw dust glued and compressed together under heat and pressure

22
Q

Properties of MDF

A

Cost effective, dense, thick, very heavy, smooth, unaffected by heat, good electrical insulator, paints well, produces to much dust, easy to work with

23
Q

Definition of a hard board

A

Made from soft wood which is formed into sheets under high pressure

24
Q

Properties of hardboard

A

Cheap sub for ply wood, absorbs moisture easily, not very rigid, susceptible to buckling

25
Q

Definition of chipboard

A

Made from chips of wood mixed with synthetic glue, the mixture is squeezed between rollers and then dried between metal plates under high pressure and heat

26
Q

Properties of chipboard

A

Similar strength properties in both directions, relatively weak, strength can be improved by using a veneer or melamine coating over the surface

27
Q

Definition of block board

A

Made of core of soft wood strips, up to 25mm wide. Strips are placed edge to edge and sandwhich Ed between veneers of hard wood which is glued together under high pressure.

28
Q

Properties of block board

A

Light weight, easily transported and less costly

29
Q

Finishes for wood

A

Stains, oils, polishes, paints, synthetic resins, laminates, veneers

30
Q

Definition of stains

A

Used for exterior timbers where protection is required as well as an attractive finsih

31
Q

Properties of stains

A

Leave an attractive finish, include a fungicide to prevent mould growth. Change the colour of the wood whilst leaving the natural grain visible. Don’t provide protection against moisture

32
Q

Definition of oils

A

Wood oils provide a waterproof finish and enhance the colour of the wood

33
Q

Properties of oils

A

Waterproof finish, enhance the colour of the wood, provides longer lasting protection

34
Q

Definition of polishes

A

Provides a high gloss finish

35
Q

Properties of polishes

A

High gloss finish and colour, protection not as durable as other finishes

36
Q

Definition of paints

A

Colours and protects the wood

37
Q

Properties of paints

A

Colours and paints the wood, covers knocks and bumps and other blemishes

38
Q

Definition of synthetic resins

A

A thick liquid capable of hardening.

39
Q

Properties of synthetic resins

A

Thick liquid that can harden, provides a very tough surface that is seamless and waterproof

40
Q

Definition of laminates

A

Laminates are commonly used on manufactured boards such as MDF and chip board. It involves the addition of a Formica layer around the surface.

41
Q

Properties of laminates

A

Aesthetic, addition fictional requirements such as water resistance, toughness and durability

42
Q

Definition veneers

A

veneers are thin slices of wood and sometimes bark, usually thinner than 3mm, typically glued onto core panels to produce flat panels such as doors, floors and furniture

43
Q

Properties of veneers

A

Adds to aesthetics and makes product more attractive

DT (15 decks)

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