invention before and after a processing operation for the purpose of the explanation a welding with heated welding beams 11 has been selected as a processing the basics however also apply analogously to other processing types according to the movement of the stream of conveyed objects 3 as well as the welding beam 11 from the left to the right first the leading hold down means 12 a comes into contact with the upper region of the packaging means 2 a in the stage according to fig3 the leading hold down means 12 a has already pressed the upper region of the packaging means 2 a against the lower region of the packaging means 2 b and begins to spring in in the direction of the arrow thus in the radial direction with respect to the welding rotor 10 the trailing hold down means 12 b is already in contact with the upper region of the packaging means 2 a in the stage according to fig4 the trailing hold down means 12 b has also pressed the upper region of the packaging means 2 a downwards the hold down means fix and stabilize the packaging means 2 a 2 b for example a plastic film in the stage according to fig5 the two hold down means 12 a 12 b are sprung in essentially in the perpendicular direction to the.