About Rotomoulding

Rotomoulding offers relatively low tooling costs, economical short runs and ability to cope with large moulds. It is ideally suited to new product development and prototype work can be carried out without vast expense. The process of rotomoulding is essentially very simple and can be broken down into four key stages.

Explanation of the Rotomoulding Process

Loading 

The metal mould is filled with a predetermined quantity of polymer powder, closed, clamped and then passed into an oven chamber.

Heating 

The mould is heated externally to a high temperature and rotated around both vertical and horizontal axis. As the powder inside heats up, it begins to melt and adhere to the inner surface of the mould. This continues until an even layer of molten plastic is formed over the surface of the mould.

Cooling

In the cooling chamber air is directed at the mould and in some cases water jets are used. When the plastic inside the mould has become solid, the mould can be removed from the chamber.

Unloading 

The plastic component is then removed from the mould and allowed to finish the cooling process unrestricted by the mould.

Cycle time can vary from 20 minutes to one hour. The plastic is formed without pressure and as a result has no moulded in stresses.

Why choose Rotational Moulding?

An ever-increasing awareness of the rotational moulding process has led designers to choose this process for some quite complex parts. Relative to blow moulding, rotational moulding permits much more complex, asymmetrical shapes. Wall thickness distribution is more uniform with rotomoulding and part size can go well beyond anything which is possible with blow moulding. Relative to injection moulding, rotational moulding has major advantages of low mould cost and the ability to produce complex hollow articles.

Advantages of rotational moulding

  • Tooling costs are relatively low when compared to other processes. This is mainly due to the fact that rotational moulding is a low pressure process meaning high strength moulds are not needed.
  • Moulds which differ greatly in shape and size can be can be run simultaneously on the same equipment.
  • Wall thickness uniformity is good when compared to blow moulding or thermoforming.
  • Finished parts can be virtually stress free if designed carefully.
  • The process is extremely versatile. Parts can be manufactured with inserts moulded in and surface textures and effects reproduced with relative ease.
  • Using automated oil heated Leonardo machines, Rototek can now deliver large production runs economically having virtually eliminated the labour content.

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Client Testimonials

If we have an urgent requirement, Rototek will do all that they can to help us achieve it.

- Norman Buckett- Flambeau Europlast Ltd-

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