Plastic blow moulding, also known as blow forming, is a manufacturing process by which hollow plastic parts are formed. It is a process used to produce hollow objects from thermoplastic. In general, there are three main types of blow moulding: extrusion blow moulding, injection blow moulding, and stretch blow moulding. Extrusion blow moulding is the most widely used of many plastic blow moulding methods. In extrusion blow moulding (EBM), plastic is melted and extruded into a hollow tube (a parison). Blow moulding is the forming of a hollow object by “blowing” a thermoplastic molten tube called a parison in the shape of a mould cavity. This parison is then captured by closing it into a cooled metal mould. Air is then blown into the parison, inflating it into the shape of the hollow bottle, container or part. After the plastic has cooled sufficiently, the mould is opened and the part is ejected.