What defines the process of Rotational Moulding?

The definition of Rotational Moulding is primarily characterized by the rotation of moulds during the heating process. This technique involves placing a predetermined amount of powdered plastic material into a mould, which is then heated and simultaneously rotated along two axes. As the mould rotates and heats up, the plastic powder melts and coats the inner surfaces of the mould, forming a hollow part once it cools and solidifies. This process allows for the production of complex shapes and large components that are often used in various applications, such as storage tanks, children's toys, and other durable products.

Focusing on this characteristic of rotating moulds is crucial, as it distinctly sets Rotational Moulding apart from other forming methods that do not rely on this dual action of heat and rotation to achieve the desired shape of the product. The other choices involve different manufacturing processes or methods that do not define Rotational Moulding specifically.