Chapter 3- part 2 Flashcards
(33 cards)
1
Q
What are thermoforming plastics?
A
- Generally more flexible
- Can be reformed many times when heated
2
Q
What are thermosetting plastics?
A
- They have cross-links
- They are more rigid
- Once they have have been set they cannot be reformed
3
Q
PETE
A
- Thermoforming plastic
- easily coloured+ smooth finish
- Used for bottles
4
Q
HDPE
A
- Thermoforming plastic
- Opaque + takes colour well
- Lightweight
- Used for bins + pipes
5
Q
PVC
A
- Thermoforming plastic
- High gloss finish
- Flexible
- Used for raincoats
6
Q
LDPE
A
- Thermoforming plastic
- Thin to medium thick
- High strength to weight ratio
- Used for plastic bags
7
Q
PP
A
- Thermoforming plastic
- Tough + chemically resistant
- used for stationary
8
Q
PS
A
- Thermoforming plastic
- Food safe
- Used for yogurt pots
9
Q
Acrylic
A
- Thermoforming plastic
- Huge colour range
- Tough but brittle when thin
- Used for car lights + trophies
10
Q
Epoxy resin
A
- Thermosetting plastic
- 2 liquids : a resin + a hardener
- Strong + expensive
- Used for bonding different materials together
11
Q
Melamine Formaldehyde
MF
A
- Thermosetting plastic
- Moulded into variety of shapes
- Hygienic + Lightweight
- Kitchenware
12
Q
Urea Formaldehyde
UF
A
- Thermosetting plastic
- Mainly white colour
- Heat resistant + electrical insulator
- Used for electrical fitting
13
Q
Polyester resin
PR
A
- Thermosetting plastic
- Similar to epoxy resin ( hardener + resin)
- Heat resistant
- Used for encapsulation of artefacts
14
Q
Phenol formaldehyde
PF
A
- Thermosetting plastic
- Electrical insulator
- Used for electrical components
15
Q
How is yarn created?
A
By spinning plant fibres together
16
Q
Cotton
A
- White,fluffy
- Taken from cotton plant
- Soft + Strong
- Used mostly for clothing
17
Q
Wool
A
- From sheep
- Warm + naturally crease resistant
- Jumpers + Coats
18
Q
Silk
A
- From the cocoon of a silk worm
- Has a natural shine (triangle structure)
- Very soft + gentle to skin
- Luxury clothing
19
Q
Polyester
A
- Can be made into different fabrics
- Tough, strong, hard
- Clothing , fleece garments
20
Q
What is a sustainable source are polymers derived from?
A
Vegetable starches
21
Q
Polyamide
Nylon
A
- Very versatile fibre
- Good strength
- Clothing + ropes
22
Q
Elastane
LYCRA
A
- Smooth to touch
- Added stretch
- Freedom of movement
- Sportwear
23
Q
Poly-cotton
A
- Made from polyester + Cotton
- Mote durable than cotton
- Used for bedding
24
Q
How is cloth woven?
A
2 strands woven at 90 degrees to each other
25
What are warp threads?
They are a fixed loom that run the length of the fabric
26
What are weft threads?
They run across the width of the fabric from selvedge to selvedge
27
What is a plain weave?
- Weft yearn goes under and over the warp yarn
- Interlaces at 90 degrees to each other
- Cheaper to produce
- Cheesecloth
28
What is felting?
Matting together fibres using a combination of heat, pressure, moisture and movement
29
Bonded fabric
- Lack strength
- Can be cut in any direction
- Used ad disposable products
30
Felted fabrics
- Wide range of fibres
- Has no elasticity
- Used for hats + insulation
31
What is weft knitting?
- Interlocking loops across the width of a fabric
| - Quite stretchy
32
What is warp knitting?
- Loops interlocked vertically
| - Tend to hold their shape
33
Knitted fabric
- Loops of yarn interlocked
- Warm to wear
- Jumpers + cardigans etc
