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Injection Stretch Blow can be broken down into 1-step and 2-step. Injection stretch uses a preform, either made in the machine itself for one-step or created in a separate injection molding machine for 2-step, that is then reheated.  As the parison is reheated it is stretched by a rod.  This stretching aligns the molecules bi-axially.  This bi-axial orientation provides an increase in strength of the product while using minimal raw material. The neck and screw top remain in the shape of original injection.  Injection stretch machines are used almost exclusively for PET and are ideal for producing bottles used in carbonated soda bottles.

Typical Injection Stretch Blow Manufacturers: Husky, Nissei, Krupp, Sidel, Side, Cincinnati
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