EP2512816B1 - Verfahren zur herstellung einer besonders beim flexodruck nützlichen dosierwalze - Google Patents
Verfahren zur herstellung einer besonders beim flexodruck nützlichen dosierwalze Download PDFInfo
- Publication number
- EP2512816B1 EP2512816B1 EP09796287.2A EP09796287A EP2512816B1 EP 2512816 B1 EP2512816 B1 EP 2512816B1 EP 09796287 A EP09796287 A EP 09796287A EP 2512816 B1 EP2512816 B1 EP 2512816B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hard material
- process according
- coating
- metering roll
- layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Not-in-force
Links
Images
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
- B41N7/00—Shells for rollers of printing machines
- B41N7/005—Coating of the composition; Moulding; Reclaiming; Finishing; Trimming
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F31/00—Inking arrangements or devices
- B41F31/26—Construction of inking rollers
-
- 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
- B41N7/00—Shells for rollers of printing machines
- B41N7/06—Shells for rollers of printing machines for inking rollers
-
- 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
- B41N2207/00—Location or type of the layers in shells for rollers of printing machines
- B41N2207/02—Top layers
Definitions
- the present invention concerns a process for manufacturing a metering roll especially usable in flexographic printing presses, in varnish stations for offset presses and/or in short ink train dry offset presses for example, comprising a central cylindrical core and at least one layer of a hard material peripheral coating.
- the metering rolls so-called “anilox rolls” are widely used to bring a metered quantity of ink to the plate roll with which it is in contact.
- the surface layer of the peripheral coating is usually ceramic or metal or a metallic component or alloy, as a metal oxide or carbonate for example. This layer is engraved, mainly by use of a laser beam.
- the process of the invention offers a new technology permitting to refurbish the anilox rolls much more easily, more quickly and at lower costs.
- This invention is preferably based on an idea of improving the usual process for manufacturing a metering roll, so-called "anilox roll”. It is also based on the aim to reduce the number of steps and simplify the operations and consequently decrease the cost to refurbish used metering rolls.
- the process of the present invention such as defined in the preamble is characterized in that it comprises at least a first step of melting superficially at least partially the hard material coating, a second step of solidifying said melted hard material, and a third step of engraving the said solidified layer of hard material.
- the first step consists in melting a superficial layer of a rough coating of hard material located on the cylindrical core of a new metering roll to provide a flat smooth surface without any unevenness ready to be engraved.
- the first step consists in melting at least partially the hard material coating of a used metering roll at a depth sufficient to remove any unevenness of the surface to provide a flat smooth surface without any unevenness ready to be engraved.
- the first step may be performed preferably by a laser beam. According to an alternative solution, the first step may be performed by a plasma torch.
- Said hard material coating obtained during the second step comprises preferably at least a ceramic, at least a metal or at least a metallic component.
- the third step is preferably performed with at least one laser beam, or a similar technology.
- the process of the invention may be used as well for manufacturing new metering rolls as for refurbishing used metering or so-called anilox rolls.
- the process permits to modify the properties of the peripheral coating, especially the surface tension, the porosity, the hardness.
- the process permits to reduce the costs of a life extension of the used metering rolls. Further it is also possible to modify the properties of the coating like for new rolls.
- the steps for refurbishing used anilox rolls are the following :
- Figure 1 shows partially the surface of a so-called anilox roll 10 to be refurbished according to the process of the invention. It comprises a central cylindrical core 11 and at least one layer 12 of a hard material peripheral coating. In the drawing only one layer is shown, but the coating could be formed of a plurality of different layers having each another composition and/or properties.
- the outer part 13 of the layer 12 is engraved, preferably by use of a laser beam (not shown).
- Figure 2 shows the anilox roll 10 with a part 14 of the coating of hard material 12, including the engraved outer part 13, melted by a laser beam 15, on a thickness that is deeper than the depth of the existing textured layer 13.
- Figure 3 shows the anilox roll 10 having a melted and solidified layer 16 of a hard material recovering the coating 12 and being provided with a new engraving 17 made by at least one laser beam.
- This process according to the invention permits to withdraw the steps (a) to (c) of the prior art technology commonly used for refurbishing anilox rolls.
- the grinding and polishing as a second step should be replaced by laser melting and smoothening of the hard material that solidifies and forms a smooth and flat surface.
- the steps of grinding and polishing with diamond bands or similar will be saved.
- the physical properties, i.e. the mechanical resistance or other specifications may be adapted to special applications of the metering rolls by choosing the appropriate hard material and laser parameter settings.
- the densified and smoothened hard material coating can be engraved with a laser beam.
Landscapes
- Printing Plates And Materials Therefor (AREA)
- Manufacture Or Reproduction Of Printing Formes (AREA)
- Inking, Control Or Cleaning Of Printing Machines (AREA)
Claims (9)
- Verfahren zum Herstellen einer Dosierwalze, die insbesondere zum Beispiel bei Flexodruckmaschinen, in Lackierstationen für Offsetdruckmaschinen und/oder in Kurzfarbwerk-Trockenoffsetdruckmaschinen verwendbar ist, mit einem zentralen zylindrischen Kern (11) und wenigstens einer Schicht (12) aus einer Umfangsbeschichtung aus einem harten Material,
dadurch gekennzeichnet, dass
es wenigstens einen ersten Schritt des zumindest teilweisen oberflächlichen Schmelzens der Beschichtung aus hartem Material und einen zweiten Schritt des Erstarrens des geschmolzenen harten Materials und einen dritten Schritt des Einschneidens bzw. Gravierens der erstarrten Schicht des harten Materials aufweist. - Verfahren nach Anspruch 1,
dadurch gekennzeichnet, dass
der erste Schritt aus dem Schmelzen einer oberflächlichen Schicht einer rohen Beschichtung aus einem harten Material auf dem zentralen, zylindrischen Kern einer neuen Dosierwalze besteht, um eine flache, glatte Fläche ohne jegliche Unebenheit zu bilden, die bereit ist, graviert zu werden. - Verfahren nach Anspruch 1,
dadurch gekennzeichnet, dass
der erste Schritt aus dem zumindest teilweisen Schmelzen der Beschichtung aus einem harten Material einer gebrauchten Dosierwalze in einer Tiefe besteht, die ausreichend ist, um jegliche Unebenheit der Oberfläche zu entfernen, um einen flache, glatte Fläche ohne jegliche Unebenheit zu bilden, die bereit ist, graviert zu werden. - Verfahren nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet, dass
der erste Schritt mittels wenigstens eines Laserstrahls durchgeführt wird. - Verfahren nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet, dass
der erste Schritt mittels wenigstens eines Plasmabrenners durchgeführt wird. - Verfahren nach Anspruch 1,
dadurch gekennzeichnet, dass
die während des zweiten Schritts erlangte Beschichtung aus dem harten Material zumindest eine Keramik aufweist. - Verfahren nach Anspruch 1,
dadurch gekennzeichnet, dass
die während des zweiten Schritts erlangte Beschichtung aus dem harten Material zumindest ein Metall aufweist. - Verfahren nach Anspruch 1,
dadurch gekennzeichnet, dass
die während des zweiten Schritts erlangte Beschichtung aus dem harten Material zumindest eine metallische Komponente aufweist. - Verfahren nach Anspruch 1,
dadurch gekennzeichnet, dass
das Gravieren während des dritten Schritts mit wenigstens einem Laserstrahl durchgeführt wird.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/CH2009/000402 WO2011072403A1 (en) | 2009-12-18 | 2009-12-18 | Process for manufacturing a metering roll especially usable for flexographic printing and metering roll obtained by this process |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2512816A1 EP2512816A1 (de) | 2012-10-24 |
EP2512816B1 true EP2512816B1 (de) | 2015-03-25 |
Family
ID=42732504
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09796287.2A Not-in-force EP2512816B1 (de) | 2009-12-18 | 2009-12-18 | Verfahren zur herstellung einer besonders beim flexodruck nützlichen dosierwalze |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP2512816B1 (de) |
WO (1) | WO2011072403A1 (de) |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5370052A (en) * | 1993-03-15 | 1994-12-06 | Man Roland Druckmaschinen Ag | Method of controlling the quantity of printing ink and reconditioning used anilox rollers |
GB2423053B (en) | 2005-02-10 | 2007-06-20 | Bernard John Boyle | Visible green laser engraved liquid metering rollers |
DE102007011708A1 (de) * | 2007-03-08 | 2008-09-11 | Kurt Zecher Gmbh | Rasterwalze für Druckmaschinen sowie Herstellungsverfahren |
-
2009
- 2009-12-18 EP EP09796287.2A patent/EP2512816B1/de not_active Not-in-force
- 2009-12-18 WO PCT/CH2009/000402 patent/WO2011072403A1/en active Application Filing
Also Published As
Publication number | Publication date |
---|---|
WO2011072403A1 (en) | 2011-06-23 |
EP2512816A1 (de) | 2012-10-24 |
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