Rotation moulding machine allowing good control of wall thickness

摘要

Rotation moulding of thermoplastic takes place within a heated mould (8) subjected to rotation about an axis and alternating tilting about a perpendicular axis user diffused heating of constant intensity acting on at least all of the bottom of the mould. At least one or more heating stations (10) produce jets of high temp. gas (11) projected at predetermined points on the outer surface of the mould during predetermined angular displacements.