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Blow Molding vs. Injection Molding

Blow Molding vs. Injection Molding
December 11, 2019 sdcpm
Plastic blow molded bottles

Blow Molding vs. Injection Molding

Blow molding and injection molding are plastic manufacturing methods commonly employed by industry professionals to produce products ranging from plastic containers to mechanical components. Both processes offer unique advantages that make them suitable for different uses cases. If you’re comparing injection vs. blow molding, the following blog post outlines the differences. Our overview of the benefits and final products will help customers determine which process is right for their next project.

Typical Products Produced by Blow Molding and Injection Molding

One of the primary differences between blow molding and injection molding processes is the type of product produced. While blow molding is suitable for manufacturing hollow plastic parts, injection molding is most often used in the creation of solid plastic objects.

Typical blow molded parts and products include:

Parts commonly created through injection molding include:

  • Automotive components
  • Mechanical parts
  • Plastic toys
  • Tool housings and handles
  • Toothbrushes and combs

Differences Between Blow Molding and Injection Molding

The blow molding process employs a two-piece mold into which a tube of hot plastic is placed. The introduction of air into the plastic tube forces the material to expand and conform to the shape of the mold. Once cooled and hardened, the plastic retains the desired part shape.

In contrast to blow molding, injection molding does not employ air to form the final product. Instead, the process injects melted plastic into the injection chamber and mold under high pressure. As the plastic cools, it takes the shape of the mold, which then forms the intended part.

Advantages of Blow Molding

Blow molding offers several advantages for specific manufacturing applications. For example:

  • It is highly suitable for the production of hollow parts, such as bottles or containers.
  • It is a versatile method that accommodates a wide range of part designs as the molds employed come in two parts, each of which can feature a different wall shape.
  • It can utilize a variety of plastic types depending on the part specifications.

Advantages of Plastic Injection Molding

Advantages of injection molding include:

  • It is ideal for the production of solid parts and products.
  • It can be used for a wide range of plastics, depending on product needs, and is useful for the manufacture of plastic parts that require additives for strength and durability.
  • The employment of highly detailed molds makes it suitable for use in the production of precision parts for engineering and manufacturing.

Molding Services from Valencia Plastics

At Valencia Plastics, we offer high-quality plastic injection molding and blow molding services. Our start-to-finish manufacturing capabilities allow us to assist customers at every stage of production, from initial planning and design to part finishing and assembly. Our highly experienced and knowledgeable team members are available for consultations throughout the project.

For more information on plastic manufacturing methods, see our related blogs:

To learn more about our services, contact us or request a quote today.


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