Process for producing hollow elastic bodies, in particular balls and similar objects, and the balls so produced

Abstract From the Canadian patent

A process for making hollow elastic bodies particularly balls and similar objects consists in, introducing a suitable doss of vinyl plastisol into a mould, formed of two joined shells, and in subjecting the mould to a first biaxial rotational moulding stage inside a heated chamber heated to a temperature able to effect the gelling of the vinyl plastisol introduced therein, distributed over the inner surface or the mould, in order to form an outer layer of a hollow body. Afterwords a first cooling stage for the mould is activated and a suitable dose or a further vinyl plastisol is introduced into the mould that is then subjected to a second biaxial rotational moulding stage in order to form …