Extrusion blow molding is ideally applied for producing hollow objects in bulk. Most common application include bottles and similar containers. Other applications include engineering components like car ventilation systems to even toys for children. A typical extrusion blow molding process works like this. A blow moulding machine is based essentially on a standard extruder barrel along with a screw assembly. They actually plasticise the polymer. The molten polymer is made to take a way via a right angle and a die. Taking this way they emerge as a hollow (generally circular) pipe section known as parison.

As the parison reaches a sufficient length subsequently a hollow mould is closed round it. The mould is able to mate very closely at its bottom edge. As a result a seal is formed. The parison is then cut at the top using a knife. This is done before the mould is being moved sideways to another position. In that position air is then blown into the parison for inflating it in the mould's shape.

After the cooling period is over the mould is then opened consequently and the final article is ejected out. For speeding up the production, numerous identical moulds are fed in a cycle by the same extruder unit.


Material used in The Extrusion Blow Molding Process

• Polyethylene(PE)
• Polypropylene(PP)
• Polyethylene – Terephthalate(PET)
• Polyvinyl chloride(PVC)

Products made of Extrusion Blow moulding Using Extrusion Blow moulding following products can be made: Bottles and containers Automotive fuel tanks Venting ducts Watering cans Boat fenders etc