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AssigneeMan Roland Drickmaschinen AG
InventorsUlrich Jung, Thomas Walther
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A method and apparatus for treating the surface of substrates such as printed sheets, with improved surface quality. The apparatus includes a first roller (2, 7) rotatable in a first direction and forming a placement surface for traveling printed sheets, one or more second rollers (4, 5, 6) mounted parallel to the first roller (2, 7) for defining a roller nip with the first roller through which the sheets are directed and for exerting a predetermined radial pressing force against the sheets, the second rollers (4, 5, 6) being rotatable in a direction opposite to the direction of rotation of the first roller (2, 7) and at least some of the second rollers (4, 5, 6) having a heating device for heating the printed sheet in the area of the roller nip between the first and second rollers.
An apparatus for treating surfaces of printed sheets in a printing machine comprising a first roller 2, 7 rotatable in a first direction and having a placement surface for sheets during travel through said machine, a second roller 4, 6 mounted in axially parallel relation to said first roller 2, 7 for defining a roller nip with said first roller 2, 7 through which printed sheets are directed and for exerting a radial force on said sheets during passage through said nip, said second roller 4, 5, 6 being rotatable in a direction opposite to the direction of rotation of said first roller 2, 7, said second roller 4, 5, 6 having a diameter smaller than the diameter of said first roller 2, 7, and said second roller 4, 5, 6 having a heating device 11, 12, 15, 16 for heating the printed sheet in the area of said roller nip between said first roller 2, 7 and said second roller 4, 5, 6.
A method for surface treatment of sheet-like substrate such as printed sheets comprising the steps of passing the substrate through a printing process of a sheet-fed printing machine, conveying the substrate to a roller nip defined by a roller surface of a first roller and a roller surface of a second roller, pressing the substrate against the first roller surface by means of the second roller surface, and heating the roller surface of the second roller to a predetermined temperature of about 350K during said pressing step.
Dependencies are inferred from the claim text.