Everything you need to know about Injection Molding Process

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Injection molding is used to manufacture plastic parts that are used in home appliances, electronics, automobiles, toys, mobile phones etc. If you look around, you can find many products manufactured from plastic parts. All of these parts are manufactured using injection molding. In this article we will discuss what is injection molding, it’s manufacturing process.

What is Injection Molding

Injection molding is a manufacturing process for producing plastic parts in large quantities. It is used to manufacture a variety of thermoplastic parts such as ABS, PC, PE, PS etc.

Injection Molding Working Principle

Injection molding involves first heating thermoplastic material till it comes into molten state. After that molten plastic is forced to injected mold closed cavity where it solidifies and takes the shape of finished part.

Injection Molding Process
Injection molding process requires injection molding machine, plastic material and a mold. To manufacture plastic part molten thermoplastic material is melted in the injection molding machine and injected into the injection mold. In mold it cools and solidifies into finished plastic part.

Thermoplastic granules are pre-heated and fed to injection molding machine barrel. Where they are heated up to its melting point. 

Heated Molten plastic fills the injection molding machine barrel.

Injection molding feed screw feeds the molten plastic to the injection mold and apply holding pressure till required time.

Plastic part is allowed to cool and solidify. After that mold core and cavity are separated and part is ejected using ejector pins.

Part Design Guidelines for Injection Molding

Plastic parts has to be designed as per plastic part design guidelines to ensure defect free and cost effective parts. Part design is also affected by thermoplastic material, part finish, injection mold material and cost constraints. We suggest you to read this article for more details on plastic part design guidelines.

Advantages and Limitations of Injection molding Process

Injection molding parts offers following advantages compared to other plastic manufacturing process.

  • High Efficiency.
  • Complex Part Design.
  • Design Flexibility
  • Ability to use different materials to manufacture same parts.
  • Reduced Waste
  • Good Dimensional consistency and control.
  • Ability to insert molding. 

Along with so many advantages it also has following limitations.

  • High initial Tooling Cost.
  • Part Design Restrictions
  • Not Economical for low volumes.

Read this article for more details on advantages and limitations of injection molding.

Injection Molding Cost
Injection molding utilizes Injection mold to manufacture plastic parts. Mold manufacturing cost and lead time is very high. Therefore injection molding process is not recommended for low production volumes. Read this article to know the factors affecting injection mold price.

To sum up, Injection molding is a manufacturing process for producing plastic parts in large quantities. Injection molding required molding machine, thermoplastic raw material and injection mold to manufacture plastic parts. 

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