of fibers the fleece is produced by exclusively mechanical processes as a flexible random fiber fleece which permits during the treatment of the object at a particular treatment pressure immersion and at least partial envelopment of the object within the fleece the fleece has a mechanical strength of 150 500 n 50 mm preferably at least 300 n 50 mm and a mean elongation at rupture of 50 150 preferably 80 100 according to din 53 857 2 application_number US 80922797 A description according to fig1 a production line 10 for a fleece 11 according to the invention produced free of bonding means through liquid jets includes an opener with mixing chamber 20 for fiber balls for the production of a loose homogeneous bulk material a weighing dosing device 30 a carding machine 40 a spreading machine 50 a jet installation 60 for the mechanical bonding of the fibers to form a random fiber fleece 11 a drying oven 70 and a winder 80 in the case of a production line operating according to the needling process a needle machine is used instead of the jet installation 60 the fiber bales are opened in the opener 20 these are preferably cross cut.