Top five benefits of plastic injection moulding

Injection Moulding machine

Plastic injection moulding is now commonplace in a variety of industries where products are produced on a massive scale. There are many advantages over traditional plastic machining which are sometimes not obvious at first glance. We will now take a look at the top five benefits of plastic injection moulding compared to other manufacturing processes.

Injection Moulding process


When mass-producing components it is vital that they are the same so that they are as efficient and durable as possible. While each plastic injection mould will be different, it is believed that accuracy during the moulding process is to within 0.005 inches. If you think about it, if you are creating a particular component for a machine then it needs to fit correctly to work. The way in which plastic injection moulds are used to build these components ensures each one is identical.

Labour costs

The greatest cost in the early stages of creating a plastic injection moulding line is the mould itself. Depending upon the complexity these can cost many thousands of pounds, but once it is finished, there is a massive reduction in ongoing labour costs compared to traditional manufacturing methods. In a world where competition and pricing can make or break a business, the ability to create identical components with minimal human supervision should not be underestimated.


Once an injection mould has been created, then it can be used to produce an array of similar yet slightly different components. This may involve mixing different materials, for various levels of durability and strength, or utilising different coloured materials, for visual impact, to name but two options. This ability to quickly adapt to different environments and consumer demand is priceless in the world of business. As the underlying injection mould does not change there is any further additional expenditure required in this area.

Injection Moulding machine

Minimal wastage

When you consider various manual or part-manual processes to create plastic components, there can be significant wastage. Whether this is wastage from the actual component manufacturing process, or when applying the finishing touches, it can add up over time. The fact that plastic is injected at high speed into the injection mould ensures that there is minimal if any, wastage and there is limited additional “finishing work” to do. It is also worth noting that any material wastage can be recycled by simply adding the plastic back into the molten plastic reservoir. In a business world where environmentally friendly products and recycling play a growing part, this is a significant benefit of the plastic injection mould process.

Speed of processing

If we compare the rate of plastic injection moulding to other component manufacturing processes which include manual work, there is only one winner every time. The consensus seems to be that cycle times for plastic injection moulding vary between 15 to 30 seconds – in reality, this will depend upon the complexity of the mould itself. In essence, the process is identical whatever the basic design, the injection of liquid plastic at high speed into a mould. While there is obviously additional costs and time taken to create the automated process, in a world where competition is rife, and price points are vital, the plastic injection mould process plays a pivotal role. We can only imagine how the manufacturing industry accommodated an excessive demand for particular components when the process was more manual based.


The world of plastic injection moulding has developed significantly over the years, and in reality, you only need to look around you to see the results. Accuracy, the speed of manufacture and material costs all have an impact on the end price of any component. The ability to create identical components ensures maximum efficiency when in use. There is also the opportunity to add different mixes to the process for durability and strength as well as different colours for visual effect.

The cost of everyday items would be significantly higher today if it were not for the plastic injection moulding process.



Is engineering suffering from an identity crisis?

engineering identity crisis

If somebody asked you what you perceived to be a career in engineering, there are dozens of different aspects you could look at. Civil engineering, chemical engineering, electrical engineering, design engineering, the list goes on. Is it fair to suggest that engineering is suffering from an identity crisis of sorts?

Engineering means something different to everybody

The word “engineering” is connected with a whole array of different careers all of which come under the engineering umbrella but can be very different. It is, therefore, difficult to educate the wider public with a one ideal fit. This is where we need to look at school education and post-school education so that potential engineers of the future do not fall between the gaps. Many people leave school with a particular set of skills and aims which would be perfectly aligned with a career in engineering. How many of them make it into the world of engineering?

engineering identity crisis

Different skills in engineering

Design engineering is very different from mechanical engineering, and chemical engineering is very different from electrical engineering, and the list goes on. As a consequence, the particular skill sets required for various areas of engineering need to be publicised to a greater extent. Skill sets, potential career advancements as well as remuneration and employment opportunities are all areas which need to be promoted a lot more than they are today.

The old idea of an engineer slipping on a set of overalls, working with engines all day and getting covered in grease and grime is long gone. True, there are various areas of the engineering industry where manual labour can take centre stage, but there are many other alternatives including computer-aided design, etc. In a world where computer skills are central to the development of children going forward, why are more people, both male and female, not even considering a career in engineering?

Male and female divide

The idea that the engineering industry is a male-dominated workplace is still relatively strong in the minds of many people today but is this a fair reflection of the opportunities available? As we touched on above, the perception that manual labour is an integral part of the engineering sector today has actually been superseded by the development of computer-aided design, etc. So, while many potential female engineers are more than able to hold their own in the manual labour stakes, those looking for non-manual labour intensive careers have more opportunities than they perhaps think.

Potential female engineers of years gone by have on numerous occasions mentioned what many see as a “sexist” element of this perceived male-dominated industry. It is easy to forget sometimes that recent equality legislation has changed the whole working environment right across the board. Any inappropriate language should be reported and challenged as soon as possible, inequalities between the remuneration of female and male engineers are now few and further between and in theory there should be equal opportunities for both male and female engineers.

In practice, there is still much to do, but there is no doubt that the perceived “male dominated” era of years gone by has been diminished somewhat.

Male and female devide at work

Why is engineering not a first choice career for many?

We have only just touched on the massive variation in engineering opportunities across the UK and indeed across the world. Whether you are looking towards electrical engineering, mechanical engineering, chemical engineering or design engineering, naming but a few, the opportunities are immense. The fact is that engineering as a career needs to be promoted more in schools and further education with more apprenticeships made available and more funding required.

It would be wrong to suggest we have not seen significant changes in the way in which engineering is perceived as a career, but there is still a long way to go. Inequalities in the workplace are being addressed, different types of career are now more heavily promoted and the old stigma often attached to a career in engineering is gradually disappearing. Have you ever considered a career in engineering?