connected with a suction generating pump or the like during advancement from the transfer station 6 to the inlet a of an elongated straight path constituting a rolling channel 18 the axis of the drum shaped conveyor 7 is parallel to that of the conveyor 1 the minimal width of the nip of the conveyors 1 and 7 at the transfer station 6 is selected in such a way that a rib 12 which arrives at this station can expel the product 2 from the immediately adjacent flute 4 and the corresponding suction port s of the conveyor 7 then attracts or attract the product 2 to the rib 12 on its way with the conveyor 7 toward the inlet a of the rolling channel 18 the conveyor 7 is provided with additional suction ports one is shown at 5 which attract the nonadherent uncoated outer sides of the uniting bands 3 to the peripheral surface of the conveyor 7 in such a way that the uncoated non adhesive sides or surfaces of the uniting bands face away from the axis of the conveyor 7 an endless belt or band conveyor 13 also known as functional conveyor is trained over the drum shaped conveyor 7 and over a third drum shaped.