Plastic material is far cheaper than other kinds of materials. It’s an effective and versatile material used to make plastic stuff. It’s the best-selling material and uses the most worldwide.

When it comes to plastic manufacturing, injection molding is the top-notch choice for the manufacturer. There are different types of injection molding processes are available, and it selects based on the product’s specification.

How does Plastic Injection Molding Actual Works?

Plastic Injection Molding is a popular part of injection molding. It’s the easiest and most cost-effective process. It’s the process of melting the raw plastic material and then injecting it into a shaped mold to produce complex plastic parts.

Most of the plastic industry provides plastic injection molding services to customize plastic parts according to the client’s request or market demands.

Here are the significant and considerable 4 steps in the plastic injection molding process:


Making the injection molding design requires angled surfaces. Angled surface is the most considerable figure that applies to designing and building injection mold. It helps the injection-molded solid parts easy to come out from a mold without damage. 

Designing the tool (mold) is an important step needed to consider first before starting the injection molding process. In plastic injection molding, there is flexibility in selecting the designs, colours, and other features

Try to measure and design from a one to two degrees surface on a mold containing five inches of wall thickness. It needs to keep the uniform wall thickness on mold design’s corners and ribs.


The mold maker designs and builds a tool (mold) according to plastic molding needs. A mold creates with the help of advanced technology, the latest machine, the right material, and equipment. Tooling materials select based on steel’s grade and hardness.

Designing the tools determines the quality of injection molded part’s manufacturing and production. It’s design with manufacturability to meet all product’s specifications. 

Injection molding tooling process is a scientific method. It takes into production to test and performance.    

Making sure, a quality mold ensures quality plastic production. It’s necessary to design a high-quality mold with good uniform thickness


When it comes to making an injection mold, stainless steel material is the common and top choice material to make the mold. Here are the following types of steel used to make an injection mold:

  • Hardened Steel
  • Pre-hardened Steel 

When it comes to selecting a material for injection molding, it depends on the product’s needs and requirements. In this method, a plastic is the most usable material compared to other materials. Here are the following 10 most usable plastics:

  • Thermoplastic Polyurethane (TPU)
  • Thermoplastic Elastomer (TPE)
  • Polypropylene (PP)
  • Polycarbonate (PC)
  • Polyethylene (PE)
  • Polystyrene (PS)
  • Acrylic (PMMA)
  • Nylon Polyamide (PA)
  • Polyoxymethylene (POM)
  • Acrylonitrile Butadiene Styrene (ABS)


  • Melts and heats the raw plastic pellets into a heated barrel of the machine.
  • Injects the melted plastic liquid into a design shape by hydraulic pressure.
  • Cools and solidifies the melted liquid at cooling system.
  • Ejects a mold from an injection molding machine
  • Remove the parts from a mold.
  • Process repeats.


Sara works as a content editor at Every Magz. She writes for various industries and writes about entertainment, business and technology. She have five years of experience as content writer at Fugen Services, where she writes about online business and marketing.

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