Patent ID: 6998085

Claim:
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, which process comprises the steps of: providing a first mould section ( 1 ) defining a first mould surface ( 3 ) having a generally concave shape to form a mould cavity showing at least one undercut ( 18 , 19 ); closing said mould cavity by means of a second mould section ( 2 ) which has a second surface ( 4 ) situated opposite the first mould surface ( 3 ), the second surface ( 4 ) being provided with a removable non-stick covering of a flexible sheet material ( 12 , 17 ) to form, opposite the first mould surface ( 3 ), a second mould surface which extends into said undercut ( 18 , 19 ) and which defines, together with said first mould surface, the closed mould cavity; applying a polyurethane reaction mixture for producing said first part ( 6 ) into the mould cavity ( 5 ), the back side of the first part ( 6 ) being formed against said flexible sheet material ( 12 , 17 ); allowing the reaction mixture to cure to obtain said first part ( 6 ); and opening the mould and removing the first part from the mould and from the covering of the second mould section, characterised in that said covering is made of an elastically deformable sheet material ( 17 ) which is fixed to the second mould section and pre-shaped to conform at least generally to the shape of said second mould surface, the covering being maintained at least at the location of said undercut ( 18 , 19 ) on a distance from the surface ( 4 ) of the second mould section ( 2 ) so that it extends into said undercut when the polyurethane reaction mixture is allowed to cure in the mould cavity ( 5 ).