Rotational moulding is a unique plastic moulding process used primarily to create seamless, stress-free, hollow one-piece items. Also called rotomoulding, it is a high temperature, low pressure manufacturing method that combines heat and bi-axial rotation. Typical moulded parts can include parts such as containers, canoes, tanks, children’s toys, medical and industrial equipment, and automobile parts.
Proponents of the rotational moulding process point to its low production cost and unlimited design possibilities. Offering designers the opportunity to manufacture stress-free parts with uniform wall thickness and complex shapes, rotational moulding is a competitive alternative to blow moulding, thermoforming and plastic injection moulding. It produces little waste since the required weight of plastic to produce the part is placed inside the mould. Yet some critics point to its longer cycle times, where only one or two cycles per hour occur, and prefer faster manufacturing processes.
