© Copyright Quest Industries Ltd The majority of moulds for rotational moulding are currently made from metal, usually sheet steel, aluminium or coast aluminium. The moulds are quite thin, shell like structures which are designed to allow the heat source to quickly transfer heat through the metal into the powder. Large, simple moulds are generally made from fabricated metals. For highly detailed parts, where a high quality finish is necessary, either cast metals or nickel electroformed moulds are used. Most moulds are manufactured in two pieces; however for complex designs three and four piece molds can be used. The area where pieces of the mould connect to each other is known as the parting line and can include a complex curvature. The parting line is vital because the mould sections must remain tightly clamped together during the heating and cooling of the part. Careful handling of the mould is necessary to ensure the parting line is not damaged. | | |