What is injection moulding?
Injection moulding is one of the most widely used manufacturing processes in the plastic industry due to its quick cycle of production, material and colour flexibility, low labour costs, design flexibility and low waste.
Injection moulding is the preferred process for manufacturing thermoplastic and thermosetting plastics parts of diverse industrial sectors such as packaging, electrical and electronics and automotive, etc.
This process converts solid plastic pellets to viscous masses by thermal conduction and pressure which are then injected into a mould where the melt acquires its final shape by cooling down. The process cycle can vary, typically from a few seconds to minutes, depending on the size of the moulds and materials used.
How does an injection moulding machine work?
The main components of an injection moulding machine include: the injection unit, the mould and the clamp unit.
– Injection unit: In this unit the polymer is gradually melted by simultaneous
application of external heating from the barrel and pressure.
– Mould: The mould comprises a cavity and a cooling system. Here, the
molten polymer is injected under pressure into the cavity and solidifies by
controlled cooling, acquiring its final form.
– Clamp unit: This unit is essential to maintain the pressure inside the mould
and keep the mould closed during the cycle of injection.