ABSTRACT
Rotational molding, which is commonly referred to as rotomolding, is a plastic conversion process for molding large, hollow stress-free parts. This process, unlike other plastic conversion processes, does not use external pressure to mold parts, only heat. Resin, in the form of a fine powder or a liquid, is placed inside a mold base. The cover is then placed over the base and secured into position. The mold is transferred to the oven where it is rotated about two perpendicular axes at independent speeds of less than 20 RPM.1 As heat is applied, the material becomes tacky and joins together in a process called fusion. The rotation of the mold allows the sides to be evenly coated as the material is heated until fusion occurs.
