moment to safeguard that the pulp object leaves with the desired mould half when separating the pulp moulds 100 200 a negative pressure can occur in the forming space 300 this negative pressure is far smaller than the pressing pressure the conical endings of the plurality drainage channels 150 250 together with the small openings u00f8 3 as well as the difference between the pore sizes 132 d 232 d in the moulding surface 130 230 the pore sizes 122 d 222 d of the support layer 120 220 and the pore sizes 112 d 212 d of the base structure 110 210 functions as a flow resistance and restrain backflow to the forming space 300 thereby restraining backflow to the fibrous content the invention is not limited by what is described above but may be varied within the scope of the appended claims of course the configurations of the female 200 and male 100 moulds can differ from each other the sintered particles 131 231 in the moulding surface 130 230 may differ in sizes i e 131 d and 231 d may have different values likewise the sintered particles 121 221 in the support layer 120 220 may differ in sizes i e 121 d and 221 d may have different values similarly the sintered particles 111 211 in the base structure 110 210 may differ in sizes i e 111 d and 211 d may have different values the thickness 133 233 of the moulding layer 130 230 preferably lies within 0 01 mm 1 mm and it is evident for the skilled person that the thickness 133 and the thickness 233 may differ from each other the thicknesses of the support layer 123 223 may also differ from.