Classifications

• • C—CHEMISTRY; METALLURGY
  • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
  • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
  • C25D7/00—Electroplating characterised by the article coated
  • C25D7/04—Tubes; Rings; Hollow bodies
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41F—PRINTING MACHINES OR PRESSES
  • B41F13/00—Common details of rotary presses or machines
  • B41F13/08—Cylinders
  • B41F13/10—Forme cylinders
  • B41F13/11—Gravure cylinders
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
  • B41N1/00—Printing plates or foils; Materials therefor
  • B41N1/16—Curved printing plates, especially cylinders
  • B41N1/20—Curved printing plates, especially cylinders made of metal or similar inorganic compounds, e.g. plasma coated ceramics, carbides
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
  • B41N3/00—Preparing for use and conserving printing surfaces
  • B41N3/003—Preparing for use and conserving printing surfaces of intaglio formes, e.g. application of a wear-resistant coating, such as chrome, on the already-engraved plate or cylinder; Preparing for reuse, e.g. removing of the Ballard shell; Correction of the engraving
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B44—DECORATIVE ARTS
  • B44B—MACHINES, APPARATUS OR TOOLS FOR ARTISTIC WORK, e.g. FOR SCULPTURING, GUILLOCHING, CARVING, BRANDING, INLAYING
  • B44B5/00—Machines or apparatus for embossing decorations or marks, e.g. embossing coins
  • B44B5/02—Dies; Accessories
  • B44B5/026—Dies
• • C—CHEMISTRY; METALLURGY
  • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
  • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
  • C25D3/00—Electroplating: Baths therefor
  • C25D3/02—Electroplating: Baths therefor from solutions
  • C25D3/12—Electroplating: Baths therefor from solutions of nickel or cobalt
• • C—CHEMISTRY; METALLURGY
  • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
  • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
  • C25D3/00—Electroplating: Baths therefor
  • C25D3/02—Electroplating: Baths therefor from solutions
  • C25D3/30—Electroplating: Baths therefor from solutions of tin
• • C—CHEMISTRY; METALLURGY
  • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
  • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
  • C25D3/00—Electroplating: Baths therefor
  • C25D3/02—Electroplating: Baths therefor from solutions
  • C25D3/30—Electroplating: Baths therefor from solutions of tin
  • C25D3/32—Electroplating: Baths therefor from solutions of tin characterised by the organic bath constituents used
• • C—CHEMISTRY; METALLURGY
  • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
  • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
  • C25D3/00—Electroplating: Baths therefor
  • C25D3/02—Electroplating: Baths therefor from solutions
  • C25D3/56—Electroplating: Baths therefor from solutions of alloys
  • C25D3/60—Electroplating: Baths therefor from solutions of alloys containing more than 50% by weight of tin
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B44—DECORATIVE ARTS
  • B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
  • B44C1/00—Processes, not specifically provided for elsewhere, for producing decorative surface effects
  • B44C1/22—Removing surface-material, e.g. by engraving, by etching
  • B44C1/225—Removing surface-material, e.g. by engraving, by etching by engraving

Definitions

• the invention is based on a method for the production of a coated gravure or embossing cylinder, which comprises the three-dimensional structuring of a metal shell of a cylinder blank and then the galvanic coating of a three-dimensional structure produced during the structuring or the entire surface of the shell including the three-dimensional structure .
• a method for the production of a coated gravure or embossing cylinder which comprises the three-dimensional structuring of a metal shell of a cylinder blank and then the galvanic coating of a three-dimensional structure produced during the structuring or the entire surface of the shell including the three-dimensional structure .
• Such a method is from DE 10 2005 053 168 B4 known.
• the structuring can include, for example, the engraving of an uncoated or coated metal casing of the cylinder blank.
• the galvanic coating has the function of protecting the metal casing from corrosion and making it or its three-dimensional structure resistant to wear.
• Electrolytically deposited chromium layers which were applied using an electrolytic bath containing chromium trioxide in an aqueous solution, have therefore become particularly established.
• chromium trioxide is considered to be extremely hazardous to health and the environment and is subject to strict approval restrictions under Regulation (EC) No. 1907/2006 (REACH Regulation).
• the independent claim 12 relates to a corresponding gravure or embossing cylinder.
• Advantageous embodiments of the invention are the subject matter of the dependent claims.
• the method provides that the three-dimensional structure during the galvanic coating with a tin-nickel layer in an electrolytic bath comprising an aqueous solution of a nickel salt, a tin salt, a water-soluble ammonium salt and a water-soluble ammonium salt and sodium-3-oxo -1,2-benzisothiazole-2(3H)-propanesulfonate 1,1-dioxide is coated.
• the metal jacket can be a steel jacket made of low-alloy steel, for example.
• the metal jacket can already have at least one (galvanic) pre-coating before the galvanic coating.
• the pre-coating can in particular be a coating of a single chemical element or an alloyed coating which differs from the tin-nickel layer applied by the method according to the invention.
• the galvanic layer already present can be, for example, a nickel layer, a zinc layer, a tin layer, a bronze layer, a copper layer, a brass layer, or a combination of these.
• the nickel salt can be nickel chloride and/or the tin salt can be stannous chloride and/or the water-soluble ammonium salt can be ammonium hydrogen difluoride.
• the electrolytic bath may contain 0.1-100 g/l, preferably 20-60 g/l and more preferably 25-35 g/l sodium 3-oxo-1,2-benzisothiazole-2(3H)-propanesulfonate-1, have 1-dioxide.
• the nickel salt can contain 150-400 g/l, preferably 250-350 g/l and particularly preferably 310-330 g/l of nickel chloride.
• the tin salt has 10-100 g/l, preferably 40-70 g/l and particularly preferably 50-60 g/l tin(II) chloride.
• the ammonium salt may contain 1-150 g/l, preferably 40-70 g/l and more preferably 50-60 g/l of ammonium bifluoride.
• the electrolytic bath can have a pH value of 2-4 and preferably a pH value of 2.5 to 3 during the electrodeposition.
• the electrolytic bath can have a temperature of 60-75° C. and preferably a temperature of 72 to 75° C.
• a current density through the electrolytic bath can be 0.5-3 A/dm 2 and preferably 0.8-1.5 A/dm 2 in the galvanic deposition.
• Tin or nickel or a tin anode or a nickel anode can be used as the anode material in the galvanic deposition.
• the three-dimensional structuring of the shell may include engraving or embossing of the shell.
• a gravure or embossing cylinder which can have been produced according to the method described above.
• the gravure or embossing cylinder can have a three-dimensionally structured shell with a relief of elevations and depressions between adjacent elevations, the relief having an outer coating of a tin-nickel alloy.
• the outer coating can accordingly be a galvanically applied coating.
• the tin-nickel layer may have a composition of about 65% tin and about 35% nickel by weight.
• the tin-nickel layer can have a Vickers hardness of at least HV 750, determined according to DIN EN ISO 4516. In particular, the tin-nickel layer can have a Vickers hardness of more than HV 1000.
• the tin-nickel layer can have been applied galvanically to the structured casing of the gravure or embossing cylinder using the method described above.
• the mass ratio of tin to nickel in the coating can be as high as 2:1.
• Electroplated tin-nickel alloys have high corrosion resistance and hardness.
• the galvanic deposition of tin-nickel creates an intermetallic compound with an alloy that has a composition of approx. 65% by weight tin and around 35% by weight nickel.
• the hardness of conventionally produced tin-nickel alloy layers is between 600 and 700 HV. Electrodeposited tin-nickel layers show a dependency on the electrolyte base of the electroplating bath, with the addition of sodium 3-oxo-1,2-benzisothiazole-2(3H)-propanesulfonate-1,1-dioxide at comparable current densities to that formation of layer hardnesses of more than 750 HV, which can be attributed to grain refinement.
• ammonium hydrogen difluoride results in even more wear-resistant layers with a particularly low coefficient of friction and a particularly high adhesion of the coating to the three-dimensional structure.
• Tin-nickel layers show their high corrosion resistance due to the formation of a stable passive film consisting of nickel polystannate in the form of HO-Ni-O-Sn(OH)O. They are resistant to strong acids such as nitric acid, sulfuric acid and hydrochloric acid, and also to media containing chloride.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Electrochemistry (AREA)
• Materials Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Mechanical Engineering (AREA)
• Ceramic Engineering (AREA)
• Inorganic Chemistry (AREA)
• Electroplating Methods And Accessories (AREA)

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Publications (1)

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Citations (5)

• 2021
  • 2021-03-30 EP EP21166008.9A patent/EP4067537A1/fr not_active Withdrawn

Patent Citations (5)

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