moulding-additive-manufacture > Rotational Moulding

Rotational Moulding is a technique used to produce hollow components. Unlike a lot of Plastic Moulding processes, there is no pressure involved meaning it is relatively inexpensive in comparison. Due to the low capital cost, it is economical to perform short production runs however it is also suited for larger volumes too.

The process encompasses plastic material, usually in powder form being placed in a hollow mould, the mould is then closed. The sealed mould is rotated about 2 axes, whilst being simultaneously heated, consequently melting the powder inside. The rotational movement ensures the mould has an even coating of plastic. Once all the powder has melted the heat is turned off and the mould is left to cool, whilst still being rotated. After sufficient cooling time, the mould is opened and the part is removed.