EP2512816A1 - Verfahren zur herstellung einer besonders beim flexodruck nützlichen messwalze und durch dieses verfahren erhaltene messwalze - Google Patents
Verfahren zur herstellung einer besonders beim flexodruck nützlichen messwalze und durch dieses verfahren erhaltene messwalzeInfo
- Publication number
- EP2512816A1 EP2512816A1 EP09796287A EP09796287A EP2512816A1 EP 2512816 A1 EP2512816 A1 EP 2512816A1 EP 09796287 A EP09796287 A EP 09796287A EP 09796287 A EP09796287 A EP 09796287A EP 2512816 A1 EP2512816 A1 EP 2512816A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hard material
- coating
- metering roll
- process according
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 8
- 239000011248 coating agent Substances 0.000 claims abstract description 40
- 238000000576 coating method Methods 0.000 claims abstract description 40
- 239000000463 material Substances 0.000 claims abstract description 39
- 238000002844 melting Methods 0.000 claims abstract description 10
- 230000008018 melting Effects 0.000 claims abstract description 10
- 230000002093 peripheral effect Effects 0.000 claims abstract description 8
- 239000002966 varnish Substances 0.000 claims abstract description 5
- 239000010410 layer Substances 0.000 claims description 25
- 239000002184 metal Substances 0.000 claims description 5
- 239000000919 ceramic Substances 0.000 claims description 4
- 239000002344 surface layer Substances 0.000 claims description 3
- 238000007774 anilox coating Methods 0.000 description 13
- 238000005516 engineering process Methods 0.000 description 5
- 238000000227 grinding Methods 0.000 description 5
- 238000005498 polishing Methods 0.000 description 4
- 229910003460 diamond Inorganic materials 0.000 description 3
- 239000010432 diamond Substances 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
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 present invention concerns also 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, obtained by this process.
- 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.
- a first step consisting in removing the old coating by mechanical methods, like grinding, blasting. This operation is complicated and time- consuming because the coating is made of a hard material not easy to remove.
- a second step consisting in applying a new coating on the turned or grinded and corundum-blasted surface of the anilox roll.
- 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 metering roll such as defined in the preamble is characterized in that said coating comprises a superficially and at least partially melted and solidified layer presenting a flat surface layer without any unevenness, said flat surface being engraved.
- said coating is a rough material deposited on said cylindrical core of a new metering roll.
- said coating is a superficial layer of a used metering roll, said layer being obtained by melting at least partially a previously engraved coating at a depth sufficient to remove the existing engraving.
- Figure 1 is a cut view showing partially the surface of an anilox roll to be refurbished according to the process of the present invention
- Figure 2 is a similar view as in figure 1 , showing a layer of the melted hard material according to one step of the process of the present invention
- Figure 3 is a similar view as in figures 1 and 2, showing a new layer of the hard material engraved according to a further step of the process of the present invention.
- 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 :
- This operation may be done with a focused laser beam.
- the hard material coating can be engraved again with a laser beam within the re-melted zone.
- 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 5, 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.
- Relating to the manufacture of new metering rolls according to the usual process the hard material structured surface is realized in at least three steps: a first step consisting in applying a rough layer of a hard material, a second step consisting in grinding and polishing the surface of the rough layer of hard material, i.e. by diamond bands, and
- 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. Jn any case, 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.
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 true EP2512816A1 (de) | 2012-10-24 |
EP2512816B1 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
Non-Patent Citations (1)
Title |
---|
See references of WO2011072403A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP2512816B1 (de) | 2015-03-25 |
WO2011072403A1 (en) | 2011-06-23 |
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