Rotational Moulding

Rotational moulding is a process that uses bi-axial rotation of a hollow mould, which is heated in an oven and filled with a plastic pellet (called a shot or charge). The molten plastic uniformly coats the inside of the mould cavity and is then cooled, before being removed.

Polyethylene is the most commonly used plastic, although other options can include polypropylene, polyvinyl chloride, nylon and polycarbonate.

Parts that can be manufactured by rotational moulding range from water tanks to decorative plastic ornaments.

Advantages for rotational moulding include lower tooling costs than many moulding processes, minimal material wastage, uniform and stress-free components, as well as good component strength and lower volume productivity due to economies of scale. Inserts can also be employed, such as metal threads or tubes before the addition of plastic pellets that form part of the finished product.

 

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