The ability to add prefinished pieces to the mould alone is a large advantage. Metal threads, internal pipes and structures, and even different coloured plastics can all be added to the mould prior to the addition of plastic pellets. This shrinking allows for mild undercuts and negates the need for ejection mechanisms (in most pieces).
Traditionally, metal components are weakest at the corners - the exact areas where the parts endure the most stress. With injection moulding or blow moulding, it's difficult to achieve total consistency in wall thickness. Rotomoulding results in seamless parts with uniform wall thickness with more material in corners to absorb shock and stress where they are most likely to occur.COSTS and TIME
One of the great features of rotational moulding is the ability to convert large numbers of assembled components into a single functional plastic part. This not only eliminates assembly time and cost, but can also result in a more functional part with better ergonomics.
Typical designing, tooling and production can take as little as 3 months. Injection and blow moulding can take 6 months or more. Rotational moulding can get your product to market faster and more economically than any other process. Another advantage lies in the moulds themselves. Because there is no interior core to manufacture, tooling for rotational moulding parts is less expensive, they can be manufactured and put into production much more quickly than other moulding processes.