Plastics

Question 1

Explain the process of injection moulding

Answer 1

The plastic pellets are heated as they are stored by the lead screw and injected into the mould at the end and it is cooled so that it holds the shape.

Question 2

Name 3 advantages of injection moulding

Answer 2

Can make detailed components for complex products
Ideas for mass manufacture or batch production
It is very quick quick to manufacture plastic components

Question 3

Name 3 disadvantages of injection moulding

Answer 3

Very expensive to make metal moulds because they are the best solution for mass manufactures
It takes quite a long time to take a metal mould
Can be marked by injection pins and spruce marks

Question 4

Name the 9 parts of an injection moulding machine set up

Answer 4

Guide pins 
Runners 
Gates 
Sprue brush 
Locating ring 
Mould cavity 
Injector pins 
The shot 
Sprue