Plastic Injection Molding

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

How Does Plastic Injection Molding Work?

25 to 10,000+

Shipped in 15 days or less

Molds starting at $1,495

The thermoplastic injection molding process at Proto Labs is a standard process involving an aluminum mold with no heating or cooling lines running through it, which means cycle times are a bit longer. It allows our molders to monitor fill pressure, cosmetic concerns, and the basic quality of the parts.

Resin pellets are loaded into a barrel where they will eventually be melted, compressed, and injected into the mold’s runner system. 

Best for:
  • on-demand parts
  • low-volume production
  • bridge tooling
  • pilot runs
  • functional prototyping

 

Hot resin is shot into the mold cavity through the gates and the part is molded. Ejector pins facilitate removal of the part from the mold where it falls into a loading bin. When the run is complete, parts (or the initial sample run) are boxed and shipped shortly thereafter.

 

Thermoplastic Materials

We stock a range of thermoplastic and LSR materials for overmolding that are suitable for various part applications and industries.

Secondary Operations

Choose from several secondary operations on molded parts ranging from standardized finishes and basic assembly to heatstaking and ultrasonic welding.


Design Guidelines

Our basic guidelines for plastic injection molding include important design considerations to help improve part moldability, enhance cosmetic appearance, and reduce overall production time.

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Resources

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