Plastic Injection Moulding

Our plastic injection moulding process produces custom - rapid prototypes and end-use production parts in 15 days or less. We use aluminium moulds that offer cost-efficient tooling and accelerated manufacturing cycles, and stock more than 100 different thermoplastic resins.

Plastic Injection Moulding Design Guidelines will help you understand capabilities and limitations.

​We have two injection moulding service optionsprototyping and on-demand manufacturing—with each offering their own benefits depending on your project needs. If part quantities are higher, an affordable piece-part price is important and quick-turn production throughout the product life cycle is critical. For this our on-demand manufacturing option is ideal.


Why Choose Plastic Injection Moulding For Your Project?

Protolabs utilise a rapid injection moulding a technology-driven process that leverages manufacturing automation. CAD models are sent directly to the production floor where mould milling begins, but in most cases, moulds are fabricated from aluminium, not steel. This allows for faster and most cost-effective tooling when compared to traditional steel moulds. We offer a number of additional secondary services to support your project.

 

What is Injection Moulding?

Plastic injection moulding is the process of melting plastic pellets (thermosetting/ thermoplastic polymers) that once malleable enough, are injected at pressure into a mould cavity, which fills and solidifies to produce the final product.

 

How Does Plastic Injection Moulding Work?

The thermoplastic injection moulding process at Protolabs is a standard process involving an aluminium mould. Aluminium transfers heat much more efficiently than steel, so does not require cooling channels - which means the time we save on cooling can be applied to monitoring fill pressure, cosmetic concerns and producing a quality part. 

Resin pellets are loaded into a barrel where they will eventually be melted, compressed, and injected into the mould’s runner system. Hot resin is shot into the mould cavity through the gates and the part is moulded. Ejector pins facilitate removal of the part from the mould where it falls into a loading bin. When the run is complete, parts (or the initial sample run) are boxed and shipped shortly thereafter. Request your Free Design Cube which shows surface finishes and thick and thin finishes.

Protolabs Supplied Inserts 

We can supply threaded brass part inserts when specified for IM production. For our customers, it means that there is no need for additional purchasing, liaising with suppliers and arranging for the requisite number of inserts to be delivered. It eliminates the risk of delay from other suppliers. Moreover, if additional inserts are required in the event of quality failure or scrappage, that too will be taken care of by us.

Ultimately, our aim is to offer a simple and efficient supplied insert service to complete your IM order. Supplying from our own comprehensive, in-house stock means that you can focus on your project.


IM icon Logo
  • 25 to 10,000+
  • Shipped in 15 working days or less
Common Applications
  • low-volume production
  • bridge tooling
  • pilot runs
  • functional prototyping

 

 

Watch: Injection Moulding

Rapid injection moulding works best for on-demand production, bridge tooling, pilot runs, and functional prototyping. Our affordable aluminium moulds and quick turnaround times help reduce design risks and limit overall production costs.

 

Three Types of Moulding 

Manufacturing has experienced radical change over the years, but one of the few constants has been the prevalence of injection moulding as the most common process within the sector. But what makes injection moulding so compelling to design engineers around the world?

Design Guidelines: Plastic Injection Moulding   


How can I reduce mould costs?

1. Eliminate undercuts
2. Get rid of unnecessary features
3. Use a core cavity approach
4. Reduce cosmetic finishes and appearances
5. Design self-mating parts
6. Modify and reuse moulds
7. Pay attention to DFM analysis
8. Use a multi-cavity or family mould
9. Consider part size

 

Learn More about Reducing Mould Costs

What can Injection Moulding be used for?

Injection Moulding is used to make a variety of widely used products. If you look around your desk/ home you will find a multitude of injection moulded products, from bottle tops, remote control casing, console covers, syringes and most plastic made products.

To see an example of an injection moulded part worked on by Protolabs, please view our Hager case study here.

To show off some of the features our injection moulding service can offer, please click to register for your free design cube

 

 

Injection Moulding Quote: ProtoQuote with Design Analysis 

Product designers and engineers can upload a 3D CAD model online at any time to receive an interactive ProtoQuote® with free design for manufacturability (DFM) analysis and real-time pricing information within hours. The DFM analysis helps eliminate potential problems like sink, challenging undercuts or walls that are too thin or thick. Once a part design is ready and a quote approved, production begins almost immediately. Upload a part today for a ProtoQuote with design analysis.

Left shows a through hole. Right, is a pass-through core.

Moulding Tips 

Needing to solve difficult tooling and design issues? Shut-offs are a design element that help engineers solve this. Read more about incorporating shut-offs into your mould design.


Further Information

For more information on injection moulding, please check out our White Papers and comprehensive library of design tips

Need support in choosing materials for your project? See our whitepaper on thermoplastics Materials Matter

For tips and advice on designing for injection moulding. See our whitepapers Designing for Mouldability: Fundamental Elements and Design for Mouldability: Complex Features

and for further support with cosmetic appearance of moulded parts. See our whitepaper on Cosmetics

We also have design compilations for injection moulding and the initial design process.


Resources

Press operator examines liquid silicone rubber part

Free mouldability analysis within hours

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