Extrusion blow moulding
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Extrusion Blow Moulding

The extrusion blow moulding process consists of the following sequence of operations:

  • plasticised polymer is extruded as a hollow pipe called a parison
  • the parison is cut to length and clamped in the blow mould
  • the blow mould is passed to the air pipe and the parison is given a blast of air
  • air inflates the hollow parison and forces it against the sides of the mould
  • after a short cooling period, the moulding is ejected. 

The extruder produces a continuous flow of hollow section parison, so two or more moulds will be used to keep up with the flow of polymer.

Typical plastics used for extrusion blow moulding include:

  • Polyethylene - Terephthalate (PET)
  • Polypropylene (PP)
  • Polyethylene (PE)
  • Polyvinyl Chloride (PVC)
Click here to view the PDF version of this resource. Extrusion blow moulding PDF Extrusion blow moulding PDF
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