© Copyright Quest Industries Ltd Rotational moulding consists of introducing a known amount of plastic in powder, granular, or viscous liquid form into a hollow, shell-like mold. The process begins with specially developed and uniquely applied resins. They can include plastisols, polyethylene, polycarbonate, acetate butyrate, polyamide, elastomers, polyurethane, polypropylene, ethylene vinyl acetate and fluorocarbons. Some of the most advanced work is being done with cross-linked polyethylene and even nylon. The mold is rotated and/or rocked about two principal axes at relatively low speeds as it’s heated so the plastic enclosed in the mold adheres to, and forms, a monolithic layer against the mold surface. The mold rotation continues during the cooling phase; thus the plastic retains its desired shape as it solidifies. When the plastic is sufficiently rigid, the cooling and mold rotation is stopped to allow the removal of the plastic product from its mold. At this stage the cyclic process may be repeated. | | |