Process for the production of a layer part, in particular a reaction injection moulding process for the production of a polyurethane skin layer

A process for the production of a moulded, layer shaped first part (6) comprising a micro-cellular or non-cellular elastomeric polyurethane skin layer having a front side and a back side and an average thickness of between 0.1 and 3 mm and preferably between 0.5 and 1.5 mm, which process comprises the steps of:

• providing at least first (1) and second co-operating mould sections (2) having opposing surfaces (3, 4) which co-operate to provide a mould cavity (5) for moulding said first part (6);
• applying a polyurethane reaction mixture for producing said first part (6) into the mould cavity (5) in particular by the reaction injection process, the back side of the first part (6) being formed on the side of the second mould section (2);
• and
• allowing the reaction mixture to cure to obtain said first part (6), characterised in that the surface (4) of the second mould section (2) is covered with a non-stick covering (12) which is either removable from the second mould section or which comprises a permanent non-stick coating layer applied onto the surface (4) of the second mould section (2), the removable covering comprising either a flexible, elastically deformable sheet material which is pre-shaped to conform at least generally to the shape of said mould cavity or a rigid material pre-shaped in accordance to the shape of the mould cavity, and in that said reaction mixture is applied in the mould cavity (5) between said covering (12) and the surface (3) of the first mould section (1).