Injection Moulding

Injection moulding allows large quantities of plastic products to be made quickly. It is one of the most important industrial processes in the mass production of plastic goods. Initial tooling costs are very high therefore it is necessary to sell large numbers of the products being manufactured to recover costs.
Thermoplastic granules are heated and forced into mould under pressure. When cool, the mould is opened and the component, which is the exact shape of the mould cavity, is extracted.

Common products include computer game controllers, golf tees, chair seats, plastic bins and lids and clothes pegs. 

Check out this videos that explain the injection moulding process particularly well...

See if you can answer the following questions...
- What other products can you think of are injection moulded?
- Can you explain why injection moulding is economical over large production batches?
- What features show that products are injection moulded?