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Injection Moulding – the process, how it works & the machines
Injection moulding is the manufacturing process for making plastic parts and products from thermosetting and thermoplastic materials. Injection moulding is used to make a wide range of plastic products, from enclosures to model construction kits, chairs and toys.
Products produced:
Injection mouldings count for a large proportion of all plastics products that are used everyday. Due to the flexibility in shape and size the boundries have ben extended in terms of what can be produced.
Some commmon plastic products are as follows:
- Power-tool housing
- Telephone handsets
- Television Cabinets
- Electrical Switches
- DVD cases
- Car bumpers
- Dash boards
- Battery Casings
- Syringes
- Disposable razors
- Washing-up bowls
- Wheelie bins Crates/Recycling boxes
- Bottle Lids/closures
Key points and basics:
- Manufacturing process to make plastic parts
- Using Thermosetting & Thermoplastic materials
- Load the plastic as granuals, which is heated and injected into mould
The process:
- Plastic pellets are loaded into a hopper
- These are then forced past heaters which causes to melt
- This is then moved and forced using a nossle into the mould
- The mould is then seperated and the part is removed
The process is very fast and complicated shapes can be made from both thermoplastic and thermosetting polymers.
Injection moulding involves heating the polymer until it is liquid and then using pressure to force it into a mould. Injection-moulded parts can often be identified by their sprue point, a slight protrusion where the plastic was injected into the mould. They may also have a split line visible if the sides of the mould did not fit together perfectly.