Rotational Moulding
Rotational moulding is a process in which hollow plastic goods are formed using high temperature and low pressure. Rotational moulding is a versatile process that can be used to make a vast number of shapes at a low cost. Chemicals can also be added to make the plastic resistant to corrosion, static, or flame.
From start to finish, the rotational moulding process takes anywhere from 15 to 90 minutes and includes four different stages. Stage one is the charging phase, which involves loading and sealing the plastic resin into metal molds. During stage two, the mold is heated on revolving axes and spindles. Stage three is the cooling stage; cooling is usually performed with aid of a fan. In the last stage, stage four, the mold is opened and the plastic part is removed.
Rotational moulding results in one-part pieces that require no assembly. Rotational moulding is used to manufacture various goods, including bottles, kayaks, hot tubs, and helmets.