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DT- Technical Principles > Timbers And Board > Flashcards

Timbers And Board Flashcards

1
Q

What is a veneer?

A

Thin slices of wood used as decorative coverings for manufactured boards
Less than 3mm

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2
Q

What are MF laminates?

A

Melamine formaldehyde
Thin sheets of polymer which is a decorative coverings
Hard tough and chemical resistant

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3
Q

Hardwood examples:

A

Oak
Ash
Mahogany
Teak
Birch
Beech

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4
Q

Softwood examples:

A

Pine aka redwood
Spruce
Douglas fir
Larch
Cedar

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5
Q

Manufactured board examples:

A

MDF
Chipboard
Aeroply
Particle board
Plywood- marine and flexible

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6
Q

Teak uses:

A

Benches
- hardwood

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7
Q

Cedar uses:

A

Sheds
- soft wood

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8
Q

What is pine also known as?

A

Redwood

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9
Q

Larch uses:

A

Fencing
- softwood

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10
Q

Douglas fir uses:

A

Veneers
- Softwood

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11
Q

Spruce uses:

A

Indoor furniture
- softwood

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12
Q

Similar hardwood characteristics:

A

Hard
Tough
Attractive grain

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13
Q

Similar softwood characteristics:

A

Straight grain
Knotty

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14
Q

Similar manufactured boards characteristics:

A

Cheaper

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15
Q

What’s planed square edge?

A

One edge is planed- smoothed

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16
Q

What’s planed all round?

A

PAR
sides and edges are planed- smoothed

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17
Q

Advantages of manufactured board?

A

Available in large ranges
Uniform strength

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18
Q

What is seasoning?

A

The removal of excess moisture

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19
Q

What is air seasoning?

A

The traditional, inexpensive version

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20
Q

Process of air seasoning?

A

Wood is stacked beneath a shelter, to protect from rain
- air circulation will remove excess moisture

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21
Q

What is kiln seasoning?

A

Controlled and more expensive

22
Q

Process of kiln seasoning:

A

Logs are placed in a kiln on trolleys
- temperature and humiditys controlled
The steamer the drier the drier the timber

23
Q

Why are kiln seasoned products used indoors?

A

Because they are seasoned to the same content level

24
Q

Uses of air seasoned products?

A

Outdoor furniture
Because its less prone to defects
- like wooden tables

25
Q

what are the issues wood enhancement solves?

A
  • environmental attack
  • high combustion
  • lack of stability (knots and grain)
  • strength decrease once wet
26
Q

why are preservatives often copper based?

A

bc copper has good resistance to fungal attack

27
Q

how are the enchantments inserted?

A

impregnated

28
Q

how is high combustion tackled?

A

fire retardant additives

29
Q

what are two examples of laminates?

A

veneers
MF- melamide formaldehyde

30
Q

what is an example of a resin?

A

urea formaldehyde

31
Q

Ways wood is recycled:

A
  • reclaimed
  • within raw state
  • chipped and turned into Chipboard
  • resized and fabricated
32
Q

What is the process of making Chipboard known as?

A

Closed loop recycling

33
Q

Main stages of closed loop recycling:

A

1) collected
2) cleaned
3) shred
4) glued and compressed into stock form
5) recycled after use

34
Q

purpose of a finish:

A
  • prevent decay and insect attack
  • prevent moisture absorption
  • enhance appearance
35
Q

what must be done before a finish is applied?

A

sanded within grain direction
with dust wiped off

36
Q

Types of finishes?

A

Stains
Wax
Danish oil
Teak oil
Acrylic varnish
Water based paints
Colour wash
Pressure treating
Yacht varnish

37
Q

Purpose of stains?

A

Colour and enhance grain
- making inexpensive wood look expensive

38
Q

Downside of stains?

A

Non protective

39
Q

Purpose of Wax?

A

Increase surface hardness and toughness

40
Q

Purpose of water based paints?

A

Protection and colour
Increase…
Toughness
Hardness
Moisture resistance
Aesthetics

41
Q

Purpose of colour wash?

A

Colour wood whilst keeping grain visible

42
Q

Purpose of Danish and teak oil?

A

Enhance grain
Provide protection

43
Q

What is Danish and teak oil used on?

A

Outdoor timbers

44
Q

What does protection include?

A

Resistance against…
Fungal and insect attack
Weathering
Rot

45
Q

Purpose of Acrylic varnish?

A

Tougher
Harder
Heatproof
Waterproof

46
Q

Process of pressure treating?

A

Placing wood within a pressure vessel, filled with copper sulphate preservatives

47
Q

Purpose of pressure treating?

A

Protect wood for up to 50 years

48
Q

Uses of pressure treating:

A

Decking
Bridge construction

49
Q

Uses of yacht varnish?

A

Yearly outdoor woods
- doors
- boat parts
- window frames

50
Q

Purpose of yacht varnish?

A

Toughness, hardness and protection

51
Q

Pine uses?

A

Construction work
- soft wood

52
Q

Birch uses?

A

Panelling
- hardwood

DT- Technical Principles (12 decks)

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