• Injection Blow Moulding

    Overview

    Injection blow moulding is used for the Production of hollow objects in large quantities. The main applications are bottles, jars and    other containers. The Injection blow moulding process produces bottles of superior visual and dimensional quality compared to    extrusion blow moulding. The process is ideal for both narrow and wide-mouthed containers and produces them fully finished with no flash.

     

    Typical Materials Used 
     
    Polyethylene (Low Density) LDPE, LLDPE
    Polypropylene PP
    Polyethylene - Terephthalate PET
    Polyvinyl chloride PVC
    Polyethylene (High Density) HDPE

     

    The Process
    The process is divided in to three areas:
    Injection

    The injection blow moulding machine is based on an extruder barrel and screw assembly which melts the polymer. The molten polymer is fed into a manifold where it is injected through nozzles into a hollow, heated preform mould. The preform mould forms the external shape and is clamped around a mandrel (the core rod) which forms the internal shape of the preform. The preform consists of a fully formed bottle/jar neck with a thick tube of polymer attached, which will form the body.
     

    Blowing

    The preform mould opens and the core rod is rotated and clamped into the hollow, chilled blow mould. The core rod opens and allows compressed air into the preform, which inflates it to the finished article shape.
      

    Ejection

    After a cooling period the blow mould opens and the core rod is rotated to the ejection position. The finished article is stripped off the core rod and leak-tested prior to packing. The preform and blow mould can have many cavities, typically three to sixteen depending on the article size and the required output. There are three sets of core rods, which allow concurrent preform injection, blow moulding and ejection.