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What is injection blow molding?

Many people are aware that there are different molding systems, but few clearly understand the unique properties of each type.  The process of injection blow molding (IBM) is used for the production of hollow glass and plastic objects in large quantities. In the IBM process, the polymer is injection molded onto a core pin; then the core pin is rotated to a blow molding station to be inflated and cooled. This is the least-used of the three blow molding processes, and is typically used to make small medical and single serve bottles. The process is divided into three steps: injection, blowing and ejection.

As with any manufacturing system there are pros and cons, here are a few for injection blow molding.

Pros of Injection Blow Molding

  • Faster production speed than extrusion blow molding
  • Higher precision than extrusion blow molding, but still not exactly a precision process
  • Net cost may be lower in high volume production


  • Higher setup costs due to two different molds.
  • May take longer to setup to produce the first product.
  • Less flexible in adjusting for different product gram weights.
  • Limited to hollow parts.
  • Limited to smaller containers.
  • Limited to simple shapes with no handles.