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DT- Technical Principles > Timbers And Board > Flashcards

Timbers And Board Flashcards

(52 cards)

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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 - denser
deciduous (broad leafed)

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13
Q

Similar softwood characteristics:

A

Straight grain
Knotty
coniferous (needles - knots)

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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?

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A

Controlled and more expensive

22
Q

Process of kiln seasoning:

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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?

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A

Because they are seasoned to the same content level

24
Q

Uses of air seasoned products?

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A

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

25
what are the issues wood enhancement solves?
- environmental attack - high combustion - lack of stability (knots and grain) - strength decrease once wet
26
why are preservatives often copper based?
bc copper has good resistance to fungal attack
27
how are the enchantments inserted?
impregnated
28
how is high combustion tackled?
fire retardant additives
29
what are two examples of laminates?
veneers MF- melamide formaldehyde
30
what is an example of a resin?
urea formaldehyde
31
Ways wood is recycled:
- reclaimed - within raw state - chipped and turned into Chipboard - resized and fabricated
32
What is the process of making Chipboard known as?
Closed loop recycling
33
Main stages of closed loop recycling:
1) collected 2) cleaned 3) shred 4) glued and compressed into stock form 5) recycled after use
34
purpose of a finish:
- prevent decay and insect attack - prevent moisture absorption - enhance appearance
35
what must be done before a finish is applied?
sanded within grain direction with dust wiped off
36
Types of finishes?
Stains Wax Danish oil Teak oil Acrylic varnish Water based paints Colour wash Pressure treating Yacht varnish
37
Purpose of stains?
Colour and enhance grain - making inexpensive wood look expensive
38
Downside of stains?
Non protective
39
Purpose of Wax?
Increase surface hardness and toughness
40
Purpose of water based paints?
Protection and colour Increase... Toughness Hardness Moisture resistance Aesthetics
41
Purpose of colour wash?
Colour wood whilst keeping grain visible
42
Purpose of Danish and teak oil?
Enhance grain Provide protection
43
What is Danish and teak oil used on?
Outdoor timbers
44
What does protection include?
Resistance against... Fungal and insect attack Weathering Rot
45
Purpose of Acrylic varnish?
Tougher Harder Heatproof Waterproof
46
Process of pressure treating?
Placing wood within a pressure vessel, filled with copper sulphate preservatives
47
Purpose of pressure treating?
Protect wood for up to 50 years
48
Uses of pressure treating:
Decking Bridge construction
49
Uses of yacht varnish?
Yearly outdoor woods - doors - boat parts - window frames
50
Purpose of yacht varnish?
Toughness, hardness and protection
51
Pine uses?
Construction work - soft wood
52
Birch uses?
Panelling - hardwood

DT- Technical Principles (12 decks)

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