Injection Stretch Blow Moulding

Injection stretch blow moulding is an advanced manufacturing process designed for producing high-quality, precision containers, enhancing the traditional injection blow molding by introducing a stretch rod during the blow moulding stage.

Process Advantages:


  • Enhanced Quality: Offers superior visual and dimensional container quality over extrusion blow moulding.

  • Versatile Container Shapes: Suitable for creating both narrow and wide-mouth containers with precision and no excess material or "flash."



Stages of Production:


1. Injection Phase:

  • Molten polymer is directed into a cavity where it takes the shape of the PREFORM.

  • A mandrel forms the inner diameter while the outer shape is crafted by the cavity.

  • The PREFORM is then rotated for the next production phase.


2. Stretching and Blowing:

  • The preform is brought to the optimal temperature for stretching.

  • A stretch rod elongates the preform, which is then blown into shape with precise air pressure.


3. Discharge Phase:

  • The cooled preform is ejected, typically by automated systems, for efficiency.

  • This sequence is performed seamlessly on a rotating carousel of moulds for continuous operation.



Common Materials Utilized:


  • LDPE (Low-Density Polyethylene)

  • LLDPE (Linear Low-Density Polyethylene)

  • PP (Polypropylene)

  • PET (Polyethylene Terephthalate)

  • PVC (Polyvinyl Chloride)

  • HDPE (High-Density Polyethylene)



Diverse Product Output:


  • Consumer Goods: Includes a variety of bottle types for carbonated drinks, cooking oils, health products, and more.

  • Specialised Containers: Agrochemical containers and personal care product packaging.


Injection stretch blow moulding is pivotal for industries demanding high-precision and high-quality plastic containers, offering significant improvements in product strength and clarity.

Injection Stretch Blow Moulding

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