21st May, 2018
Posted by Megan Carr in
The Process of Plastic Injection Moulding
With the ability to produce a great amount of identical components, injection moulding is one of the most popular methods to manufacture plastic products.
Plastic is everywhere, whether it be the interior of our car, kitchen utensils or medical devices. Here we discuss the process of plastic injection moulding and the stages it entails before polymer material becomes a plastic product.
The process begins with an injection mould tool, which depending on the volumes of the plastic components will typically be made from aluminium or P20 steel, although there are other alternatives available such as Toolox 44 and fully hardened H13 steel.
Once cut and ready, the injection mould tool is fitted into an injection mould press and the polymer is melted down with the use of a heated barrel which is fitted it the press.
With a reciprocating screw the melted polymer is fed through to the mould via a channel system of gates and runners as it takes the desired shape of the component.
The injection moulding process includes five main stages, all of which are listed and explained below.
• Mould Opening & Ejection
Refers to the pressure which is produced from the machine to the mould during the injection and cooling process.
Once melted down the polymer is fed through the gates and into the mould where it forms its desired shape.
During the injection process there is a pause in the process which enables the plastic to fill each of the mould cavities to ensure proper shape.
Whilst still in the mould the now plastic product is given time to cool in the mould.
Mould Opening and Ejection
Following the above process the mould tool opens to release the complete product before it is quality checked and put through any required post mould operations.
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