Parts can be machined or assembled with other components, giving assemblies containing plastic and metal parts.
Process of plastic injection moulding
Step 1: A suitable thermoplastic is chosen.
Step 2: The plastic is placed inside a heated chamber.
Step 3: Using high pressure, the plastic is softened and forced into a mould.
Step 4: The plastic is hardened within the mould.
Step 5: Once solidified, the plastic moulding is removed.
More information about plastic parts and injection moulding
Over the last 25 years, plastics have become more and more a major material for products
in both engineering and the domestic household.
PLASTICS = POLYMERS
Thermoplastics (melts when heated)
Thermosets (hardens when heated)
Main methods of manufacture
a) Plastic Extrusion – Used for long lengths that have an equal cross section
Examples – Pipes or Window Frame sections
b) Plastic Injection Moulding – More complex shapes
Examples - Toys , Mobile or Telephone parts