Method for rotational moulding of a workpiece comprising a thermoplastic foam layer

摘要

Disclosed is a process for rotomoulding a part comprising at least one first layer, made of a compact polymer, and a second layer made of a foam polymer and surrounded on one face by the first layer, including steps for placement of a first quantity of material to make up the first layer in a mould, rotation of the mould to form the first layer and heating of the first quantity of material to melt it, and then placement of a second quantity of material to make up the second layer in the mould and restarting rotation of the mould, wherein heating is interrupted before the second quantity of material reaches its foaming temperature, but the mould is kept rotating until the second quantity of material reaches the foaming temperature and as long as it remains at or above this temperature, thus forming the second layer.