Plastics

Question 1

The two main groups of plastic are..

Answer 1

Thermoforming polymers - can be remoulded again and again

Thermoset polymers -can be only moulded once due to cross links of polymer chains

Question 2

List the ways we can form plastic.

Answer 2

Vacuum forming
Injection moulding
Blow moulding - for hollow products only like plastic bottles
Line bending
Extrusion

Question 3

Advantages of blow moulding

Answer 3

Make hollow shapes
Rapid manufacture once set up

But
Expensive mounds
Difficult to produce shapes with complex angles

Question 4

To form any plastic what do you need to do to it first?

Answer 4

Heat it. Thermoforming plastics can be heated and shaped many times

Question 5

Advantages and disadvantages of forming plastics?

Answer 5

High production rates possible
But
Expensive to set up the mounds

Question 6

4 types of Thermoforming plastics

Answer 6

polythene
polystyrene
polypropylene
PVC - polyvinyl chloride

Question 7

4 types of thermosetting plastics

Answer 7

UF - urea formaldehyde
MF - melamine formaldehyde
PR - polyester resin
ER - epoxy resin

Question 8

Polymers are sold in 5 forms which are…

Answer 8

sheet
film
bar
rod
tube

Question 9

Properties of polymers are

Answer 9

weight
hardness
elasticity
conductivity/insulation
toughness
strength