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What are the different blow mold options?

There are three common blow mold manufacturing processes.  Extrusion blow molds, injection blow molds, and stretch blow molds are the three most common and well known manufacturing options.

Extrusion blow molding is perhaps the simplest type of blow molding.  The process occurs by inserting plastic material from an extruder, and then water cooled in the mold.   Once the molds are closed, air is injected through the top or the neck of the container.  As the air is injected, the hot plastic expands and comes in contact with the mold walls.  When the hot plastic material is blown up and touches the walls of the mold the material “freezes” and the container now maintains its rigid shape.

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.

Stretch blow molding, this process requires the raw material to be formed in a pre-form using injection molding and later on stretch blow molding process can be applied.