the processed fiber fleece web 8 from below so that it does not sag by its own weight and be thereby possibly stretched in an undesired manner as an alternative smooth support plates of a small surface friction can be taken into consideration over which the fiber fleece web can easily slip since the web 8 is needled from both sides and the invention therefore uses double needle looms in which in a needling zone two needle units needling against one another oppose and whose needles alternatingly stitch into the fiber fleece web the stitching supports on both sides of the fiber fleece web against which the latter is pressed by the needle movement are lamella grates with longitudinally extending lots or slotted plates whose slots enable the horizontal movement of the needles for the transport of the fiber fleece web 8 in the state stitched into same details are not shown but reference may be made in this respect to the documents mentioned above again by example the use of lamella grates is known per se in the needling technology particularly when forming pole loops on needle felts that are for instance used as flooring the needles may be arranged on the needle boards in packages wherein packages are offset seen in the longitudinal direction transversely with respect to one another by less than one needle pitch to increase the stitching density on the fiber fleece web the slots in a slot.