METHOD FOR PRODUCING AN ELEMENT WITH MATERIAL THAT HAS BEEN MADE POROUS

The invention relates to a method for producing an element (5), whereby sections of porous material are produced on a support (2, 6) by making them porous. Said sections have a varying porosity curve and /or varying degrees of porosity. The inventive method is characterized by the following steps: a) a first layer (3) of porous material is produced from a substrate (2) which is located on or forms said support by making a large area thereof porous; b) at least one partial area including up to at least that part of the substrate (2) which had not been made porous is selectively removed from the first layer (3); a second layer (4) of porous material is produced from the substrate by making it porous or a) a first layer (9) of porous material is produced from a substrate which is located on or forms a support; b) a porous base layer (10) is produced from a substrate (6) which has been made porous, whereby said base layer has a larger surface than the first layer (9).