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)

The sample notes and animation below, describe the extrusion blow moulding process.
   
 
 
     

Learn about Plastics

Multimedia Design and Technology Education uses animations and supporting technology notes to teach about plastics and plastics processes.

Animations describe plastics processes in probably the most clear way possible, making plastics processes easy to understand, learn and remember.

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