The invention relates to radiation-curable compounds, processes for the preparation thereof, the use thereof and coating materials comprising them and having high scratch resistance. The downstream conveying device includes a suction device for administering suction air to the sheet quires at stationary suction openings. With the aid of a pick up and lay down head on an application means a vacuum is applied on a part, preferably the middle, of the uppermost object in a stack of thin objects being in a recess of a package. Embodiments further include structuring the retaining ring such that the distance between the outer surface to the perimeter of the substrate retained by the inner surface of the retaining ring varies. The micron conductive fibers may be metal fiber or metal plated fiber.