Trying to decide which plastic manufacturing process is best suited for your enclosure project? Here is a quick overview of some of the key factors that may affect your decision whether to use plastic injection moulding vs. custom plastic machining.
But first what’s the difference between plastic injection moulding & custom enclosure manufacturing?
The plastic injection moulding process heats solid plastic pellets until they melt, then injects it into a mould. When the plastic cools the mould is removed leaving a shaped enclosure.
The custom plastic machining process uses a sheet of plastic which is machined into the enclosure shape using specialist machinery.
So how do you choose between these plastic manufacturing processes? Here are some pointers:
Quantity is a key factor when deciding between custom enclosure manufacturing vs plastic injection moulding
The quantity required is the key driver in this decision mainly because it dictates the price per unit. Custom enclosure manufacturing is generally cheaper than injection moulding for smaller production runs. This is because the process does not need to use moulds or tools which means that there are no expensive moulds to produce, or dies to cut. Usually custom enclosure manufacturing becomes less cost effective when the order quantity exceeds 10,000.
This makes custom enclosures more cost-effective for prototype development and affordable for start-ups to test their market.
Enclosure design longevity
If you are likely to need to change the design of your custom plastic case in the near future then it is not usually financially viable to invest in an expensive mould.
Instead it is best to machine your parts as you will not only avoid spending thousands on a mould you can no longer use. You also benefit from the ability to change the design easily at any point. Plastic machining is known for being the more flexible manufacturing process. For example, after an initial order you could decide to amend or add a component to your box when you re-order. This is easily done quickly with no fuss or expensive moulds needed.
Use of advanced specialty plastics
Your selection of plastic materials is generally more limited with injection moulding. Rubbers and other flexible materials are ideal for moulding; however, many harder, high-performance specialty plastics are better suited to be machined.
Also, worth noting that with machining you can have different material options within the same production run.
So to conclude, consider custom plastic machining if you require fast turnaround times, cost efficiency for low quantities and flexibility of design.
Call us on 01280 845530 for your next enclosure prototype project, or medium production run and you will enjoy easier, faster, cost- effective custom plastic manufacturing that has no minimum order quantities.