What is plastic injection molding and how much does it cost?

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Plastic injection molding utilizes plastic resins to fashion products for various applications, including storage containers, airplane components, automotive parts, hair combs, musical and instrument parts. Several factors influence the cost of plastic injection molding, including the core mold metal number of cavities, mold base, cavity/core machining, and the complexity of the part.

What plastic is used in injection molding?

Due to its ability to mass-produce the same part or product, plastic injection molding is a commonly used manufacturing process. It can utilize a range of plastic compounds, including polystyrene, polycarbonate, polypropylene, polyethylene, polyvinyl chloride, Teflon®, and acrylic.

Can polypropylene be injection molded?

Polypropylene is a synthetic resin utilized in the injection molding process for various applications. It is one of the lowest-density plastics available and can be safely used to store food due to the fact that it does not bleed chemicals out into food products. Additional characteristics include its excellent impact strength, moisture resistance, and chemical resistance. Polypropylene is used in a number of applications, including automotive products, household goods, RV products, and marine products

Advantages and Disadvantages of Injection Molding

Advantages of injection molding include:

  • Design flexibility
  • Fast production
  • Multiple materials can be used simultaneously
  • Low costs of labor
  • Production of very small parts
  • High-output production
  • Ability to include inserts
  • Good product consistency
  • Minimal post-production scrap left over
  • Good dimensional control
  • Good color control
  • Reduced finishing requirements

Disadvantages of injection molding include:

  • Smaller sized runs of parts can be expensive
  • Restrictions on part design
  • Initial machinery in tooling cost