Rotomoulding

Rotational moulding, also known as Rotamoulding or Rotomoulding, is a process favoured for creating hollow plastic products like kayaks and fuel containers. Unlike other methods, the heating, melting, shaping, and cooling stages occur entirely within the mould without the use of external pressure.

Rotational Moulding Steps:


  • Material Addition: Plastic powder is placed into a mould, which is often made from cast aluminium or sheet steel.

  • Rotation and Heating: The mould rotates slowly on multiple axes and is heated, causing the polymer to melt and coat the mould’s interior.

  • Cooling: After the melting phase, the mould moves to a cooling station where it is cooled with air or water mist.

  • Part Solidification and Removal: As the mould and the part within it cool, the plastic solidifies, and the final product is then removed.


While rotational moulding might appear simple, it is a sophisticated process. The lack of external pressure means that the polymer isn't manipulated in the same manner as it is in high-pressure processes like injection moulding.



Variables in Production:


  • Production Variables: The process can be influenced by external factors such as ambient temperature and humidity, mould type, and the quality and particle size of the polymer powder.

  • Advantages:

    • Allows for economical production of large, hollow items.

    • Offers minimum design constraints.

    • Produces stress-free parts.

    • Typically incurs lower mould costs compared to injection moulding.


Rotational moulding stands out for its ability to efficiently manufacture large, durable, hollow items with diverse applications.

Rotomoulding

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