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Injection Moulding Explained

Injection Moulding is a fast process which can produce large volumes of identical items and is a primary process for producing plastic parts, from high precision engineering through to disposable consumer goods.

The injection moulding process is one of the most widely used and counts for a significant proportion of all plastic products. When moulding plastic into bespoke shapes you should note that there are a variety of processes which each have their own benefits. CJ Tool and Mouldings provide the specific knowledge and skill used to execute the requirements.

The injection Moulding Process

The injection moulding process is a repetitive cycle which provide identical parts suited to a customer’s purpose. This is when plastic materials are placed into an injection moulding machine (most commonly thermosetting and thermoplastic polymers) and then melted and injected under pressure through a runner system into the cavity. This pressure ensures that the plastic doesn’t collapse. To then gain defined shape for the moulded part a moulding tool is used. Once the material has cooled down and solidified, it’s finally ejected from the mould as a finished part. 

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The Machine

The injection moulding machine consists of a material hopper, a plunger and a heating barrel. The machine exerts pressure and secures the mould in place during the injection process. The type of machine used will be determined by the type of part being moulded and the material being used. As an example, large parts and stiff materials will require a machine that can exert a high clamping force and powerful injection pressure.

The Advantages

 There are numerous advantages to injection moulding, firstly the process is flexible due to the options of material choice and colour. When it comes to designing we have built a specialist section on our website providing you with our expertise and knowledge, this is known as Design Guidelines. As well as this a typical cycle can be as short as 15 seconds proving that the process is quick and can produce large volumes of parts every hour. This also means that the labour costs are low as parts can be made ready with little or no assembly.

Another advantage to using injection moulding is it produces little waste, as often plastic waste can be recycled. 

To read our blog about the advantages, follow the link. 


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Our team will be more than happy to help, advise and quote for your requirements.

Looking for more information? Check out our blog, News & Views for useful articles, tips and tricks on plastic injection moulding.