Polymer Processes 3.1.4

Question 1

What is Calendering(Polymer Process)?

Answer 1

Using heated rollers to squash and stretch polymer to make it thinner- used for continous production.
Uses thermoplastic pallets

Question 1

What is Injection Moulding(Polymer Process) ?

Answer 1

Makes complex 3D shapes
- Archimedes screw - hydraulic press - granules. Large-scale mass production
Used for electrical products

Question 2

What is Blow Moulding(Polymer Process) ?

Answer 2

Produces hollow components
Used for drink bottles - shampoo - detergents
Extruder, Parison
continuous Production

Question 3

What is Rotational Moulding(Polymer Process) ?

Answer 3

Hollow components with large wall thickness
Mould is continuously rotated through heating and cooling.
Large Scale batch or Mass production
Traffic cones, children’s play equipment.
Thermoplastic powder or granules

Question 4

What is extrusion(Polymer Process) ?

Answer 4

like injection moulding but poymers use is forced through a die
Continuous Production
Solid rods, tubing, curtain rack.

continous production

Question 5

What is Compression Moulding(polymer Process)?

Answer 5

Uses a pre-weighed slug of polymer
removed from mould while still warm
continuous Production
Electrical fittings, light switches plugs
Thermoset polymer

Question 6

What is Lay Up Lamination? (polymer Process)

Answer 6

Requires a former around a mould
A top gel coat is applied
Firbe based composite sheets
USES - kayaks

Question 7

Line Bending

Answer 7

Uses an electrically heated element that provides heat along a line.
slow process
one of production
acrylic boxes shelves
Thermoplastic sheet

Question 8

Thermoforming

Answer 8

Like vacuum forming but there is an additional mould which is pressed into the surface of the sheet