Classifications

• • 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
  • B41N1/04—Printing plates or foils; Materials therefor metallic
  • B41N1/08—Printing plates or foils; Materials therefor metallic for lithographic printing
  • B41N1/10—Printing plates or foils; Materials therefor metallic for lithographic printing multiple
• • 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
  • B41N1/04—Printing plates or foils; Materials therefor metallic
  • B41N1/06—Printing plates or foils; Materials therefor metallic for relief printing or intaglio printing
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S29/00—Metal working
  • Y10S29/039—Spraying with other step

Definitions

• m. invention rum to a method duction of metallic printing plates or cylinders comprising a plurality of layers, for book print-
• metallic printing plates or cylinders comprising a plurality of layers
• book print- There are already known printing plates or blocks comprising severalmetallic layers, example, for book printing, e. g., zinc blocks or m copper plates or cylinders for intaglio printing.
• the cast or etched printing plates are first brought toso-called galvanoplastic 2 installations, in order that the prinflnl plates or cylinders may there be nickel-plated, chrom iumplated or coated with zinc. absorbing and expensive. operation for printing works.
• etched printing plates or cylinders which are subsequently provided with a metallic coating suffer from the drawback that with fine mesh autotypes the dots contract in consesubsequently applied metallic deposits and aii'ect unfavourably the truth to tone so of the picture.
• the metallic l yers produced by'metal sprayon nickel or copper plates serve only to provide on such plates a porous grain adapted for retainingmoisture. but not for etching high or m deep a picture applied to the layer formed by metal atomisation.
• the picture to be printed is transferred to the metallic layer which carries the picture, and the non-printing areas are deepened, etched, engraved or shaved.
• the up per metallic layer or layers may be etched through, engraved or shaved at the non-printing areas.
• the underlying base for example, one of zinc, can be readily made ink-repellant in manner known per se with 'a thin etch and water or aqueous solution.
• a further very good example of such easily bendable relief printing plate with a picture carrier of great resistance to wear and'correctness of tone value consists in a base plate of aluminium which is provided with one or more thin coating layers of copper or copper alloy.
• the picture is transferredin manner known per se to the upper cuprous carrier which is then etched away at the non-printing areas with dilute nitric acid, so that at these areas the aluminium or aluminium alloy or a thin metallic intermediate layer thereabove is caused wholly oralmost wholly to appear. With suitable previous treatment these areas do not take up ink, but only the metallic layer of durable, copper-containing picture-carrier in relief is inked.
• dilute nitric acid attacks only the copper alloy, but notoriously does not attack aluminium, it is impossible: to efiect. too. deep etching of the vacant points.
• the printing plates thus comprise bases of the easily flexed metals, zinc or aluminium, and the upper metallic coating or picture-carryinglayer consists of hard wear-resistant metal, for example, copper or copper alloy.
• the upper metallic coating or picture-carryinglayer consists of hard wear-resistant metal, for example, copper or copper alloy.
• Printing plates produced by the method just described present also the advantage that now also the offset printercan print with durable metallic original etchings .of the correct tone value, which previously only the book printer was able to do.
• a similar good example is realised if there is applied-to a light metal base, for example an aluminium plate by fusion a thin iron layer which is deeply etched at the points free from the picture. Also in this case there is obtained a very durable relief picture carrier.- This example can be used both for book-printing as also for onset relief printing.
• the picture is then transferred in manner known per which is deeply etched at the points free from the picture or is etched through down to the zinc or cadmium layer or down to the light metal base.
• the intermediate layer of zinc or cadmium ensures perfect adhesion of the brass layer to the light metal base.
• the said intermediate layers ensure uniform smooth continuous closeness of the 'brass layer. For fine mesh autotypes for ofiset printing this is a great advantage.
• metal oxide layers may be electrolytically formed on a suitable light metal base such as aluminium or alloys thereof, and then the picture maybe applied to such metal oxide layers and made ready for printing in the manner already described.
• Printing plates according to the invention may be provided not only on the front side but also on the rear side with the aforesaid metal covering layers, whereby an economic advantage is realised by saving of material, because both sides of such printing plates can be used.
• drawin large area are -d1rect printing and 80 printing.
• the said metallic covering layers may not only be produced electrolytically or chemically but also by a metal spraying process or by hot rolling 'of copper on aluminium or by other methods.
• the electrolytic ap ca on of the metal layers with the n orm thickness presents certain dimculties with large iormes, in respect that the layer deposited onthe printing plate is finer in the middle than at the 4 which render it possible to obtain a uniform layer.
• printing plates according to theinvention may be used both for cadmium. and alloysalso ior indirect or oilset 3
• the method of producing metallic printin plates or cylinders for relief printing which 3 upon a pliant ground plate of light metal selected from the group con- 5 sisting of aluminium, magnesium and alloys thereof, at least one intermediate layer of a met al selected from the group consisting of zinc, thereof, superimposing on said intermediate layer or layers at least one layer oi heavy wear-resistant metal characterized is grained by electro-chemical treatment prior the superimposition of the intermediate layer.

Landscapes

• Printing Plates And Materials Therefor (AREA)
• Photosensitive Polymer And Photoresist Processing (AREA)
• Manufacture Or Reproduction Of Printing Formes (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=9774536

Family Applications (1)

Country Status (5)

Cited By (9)

Families Citing this family (2)

• 1935
  • 1935-05-30 DE DEH143836D patent/DE728837C/de not_active Expired
• 1936
  • 1936-02-12 GB GB4299/36A patent/GB470402A/en not_active Expired
  • 1936-05-27 US US82645A patent/US2181111A/en not_active Expired - Lifetime
  • 1936-05-29 BE BE415792D patent/BE415792A/xx unknown
  • 1936-05-29 GB GB15161/36A patent/GB475588A/en not_active Expired
  • 1936-05-29 FR FR825645D patent/FR825645A/fr not_active Expired

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