PROCESS FOR MANUFACTURING A FIBROUS PLY COMPRISING AN ELEMENT OF A GIVEN THICKNESS, FORMING FABRIC FOR PRODUCING THE FIBROUS PLY, METHOD FOR PRODUCING SAID FABRIC AND SECURITY SHEET INCLUDING A FIBROUS PLY
The invention relates to a wet process for manufacturing a fibrous ply on a forming fabric of a paper machine, comprising a stack of fabrics, said stack of fabrics comprising a surface fabric and at least one under-fabric, these being superposed, said fibrous ply comprising at least one element of given thickness, characterized in that it includes the following step: formation of said ply by the dewatering of an aqueous fibre-based suspension on said forming fabric, the stack of fabrics of which includes a reduced dewatering region compared with the first under-fabric, in at least one under-fabric and/or beneath the surface fabric, said reduced dewatering region being in correspondence with the position that said element will have.