At the heart of any injection moulding process is the injection moulding machine itself. Without a reliable solution you can forget about delivering a quality product. So what exactly goes into an injection moulding machine? Let’s take a look.

An injection moulding machine, also known as a press consists of a material hopper, an injection ram or screw and a heating unit. During the process material granules for the part you want to create are fed via the material hopper into a heated barrel or injection screw.

The injection screw is rotated to melt the plastic accumulated from the hopper and to accumulate molten plastic in front of the screw. Once there’s enough plastic in front of the screw the injection process starts and the plastic is forced into the mould.

Presses are rated by tonnage, which refers to the amount of clamping force that the machine can exert. The force is what keeps the mould closed during the injection moulding process. This is an important aspect because choosing the right size press is important for producing a good quality part.

The total clamp force needed is determined by a number of factors including the size of the part you are moulding, the material you’re using and the projected area of the part. Tonnage typically ranges from 5 tons to 6 000 tons.

If you really wanted to you could break the injection moulding press down even further but for the purpose of this blog article, and the possible injection moulding newbies reading we’ve decided to keep things quite basic.

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