What is Injection Moulding?

At Sinclair & Rush, we utilise a number of innovative manufacturing methods to create our wide range of products. One of the most common techniques we use in our manufacturing process is injection moulding. Because we are producing a very large number of identical items on a daily basis, we find that injection moulding to be a cost-effective method option.

Injection moulding is used to manufacture all sorts of items, including products as small as combs and bottle lids and much larger items such as storage containers. The possibilities really are endless. But how does injection moulding actually work?

The whole process must start with a mould. This mould will be responsible for forming liquid plastic into the desired shape. Moulds themselves can be made in a number of ways and the importance of a quality and exact mould cannot be stressed enough.

Once the mould is in place, the process can really begin. We start by feeding plastic component granules into a heated barrel. Inside the barrel, the granules are heated until they melt into a smooth liquid that can be transformed into just about any shape and size required for a product. Next, the liquid plastic is fed through the nozzle and injected (hence the name) through an injection moulding machine into the mould. The mould fills with the liquid plastic and as it cools, takes on the desired shape, solidifying as it cools rapidly. Once the cooling is complete, the mould will open and emit the product before repeating the process over and over again.

Not only is this process highly cost-effective, but we are now able to make the injection moulding process more sustainable with our Pelletizer line. This technology enables us to convert re-ground waste material (PETG) and convert it back into usable pellets that can be used again in the injection moulding process.

To find out more about this exciting new line, or to find out more about what products we can manufacture through our injection moulding process, please contact us.


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