Chapter 3- part 2

Question 1

What are thermoforming plastics?

Answer 1

• Generally more flexible

- Can be reformed many times when heated

Question 2

What are thermosetting plastics?

Answer 2

• They have cross-links
• They are more rigid
• Once they have have been set they cannot be reformed

Question 3

PETE

Answer 3

• Thermoforming plastic
• easily coloured+ smooth finish
• Used for bottles

Question 4

HDPE

Answer 4

• Thermoforming plastic
• Opaque + takes colour well
• Lightweight
• Used for bins + pipes

Question 5

PVC

Answer 5

• Thermoforming plastic
• High gloss finish
• Flexible
• Used for raincoats

Question 6

LDPE

Answer 6

• Thermoforming plastic
• Thin to medium thick
• High strength to weight ratio
• Used for plastic bags

Question 7

PP

Answer 7

• Thermoforming plastic
• Tough + chemically resistant
• used for stationary

Question 8

PS

Answer 8

• Thermoforming plastic
• Food safe
• Used for yogurt pots

Question 9

Acrylic

Answer 9

• Thermoforming plastic
• Huge colour range
• Tough but brittle when thin
• Used for car lights + trophies

Question 10

Epoxy resin

Answer 10

• Thermosetting plastic
• 2 liquids : a resin + a hardener
• Strong + expensive
• Used for bonding different materials together

Question 11

Melamine Formaldehyde

MF

Answer 11

• Thermosetting plastic
• Moulded into variety of shapes
• Hygienic + Lightweight
• Kitchenware

Question 12

Urea Formaldehyde

UF

Answer 12

• Thermosetting plastic
• Mainly white colour
• Heat resistant + electrical insulator
• Used for electrical fitting

Question 13

Polyester resin

PR

Answer 13

• Thermosetting plastic
• Similar to epoxy resin ( hardener + resin)
• Heat resistant
• Used for encapsulation of artefacts

Question 14

Phenol formaldehyde

PF

Answer 14

• Thermosetting plastic
• Electrical insulator
• Used for electrical components

Question 15

How is yarn created?

Answer 15

By spinning plant fibres together

Question 16

Cotton

Answer 16

• White,fluffy
• Taken from cotton plant
• Soft + Strong
• Used mostly for clothing

Question 17

Wool

Answer 17

• From sheep
• Warm + naturally crease resistant
• Jumpers + Coats

Question 18

Silk

Answer 18

• From the cocoon of a silk worm
• Has a natural shine (triangle structure)
• Very soft + gentle to skin
• Luxury clothing

Question 19

Polyester

Answer 19

• Can be made into different fabrics
• Tough, strong, hard
• Clothing , fleece garments

Question 20

What is a sustainable source are polymers derived from?

Answer 20

Vegetable starches

Question 21

Polyamide

Nylon

Answer 21

• Very versatile fibre
• Good strength
• Clothing + ropes

Question 22

Elastane

LYCRA

Answer 22

• Smooth to touch
• Added stretch
• Freedom of movement
• Sportwear

Question 23

Poly-cotton

Answer 23

• Made from polyester + Cotton
• Mote durable than cotton
• Used for bedding

Question 24

How is cloth woven?

Answer 24

2 strands woven at 90 degrees to each other

Question 25

What are warp threads?

Answer 25

They are a fixed loom that run the length of the fabric

Question 26

What are weft threads?

Answer 26

They run across the width of the fabric from selvedge to selvedge

Question 27

What is a plain weave?

Answer 27

• Weft yearn goes under and over the warp yarn
• Interlaces at 90 degrees to each other
• Cheaper to produce
• Cheesecloth

Question 28

What is felting?

Answer 28

Matting together fibres using a combination of heat, pressure, moisture and movement

Question 29

Bonded fabric

Answer 29

• Lack strength
• Can be cut in any direction
• Used ad disposable products

Question 30

Felted fabrics

Answer 30

• Wide range of fibres
• Has no elasticity
• Used for hats + insulation

Question 31

What is weft knitting?

Answer 31

• Interlocking loops across the width of a fabric

- Quite stretchy

Question 32

What is warp knitting?

Answer 32

• Loops interlocked vertically

- Tend to hold their shape

Question 33

Knitted fabric

Answer 33

• Loops of yarn interlocked
• Warm to wear
• Jumpers + cardigans etc