WO2011072403A1 - Process for manufacturing a metering roll especially usable for flexographic printing and metering roll obtained by this process - Google Patents
Process for manufacturing a metering roll especially usable for flexographic printing and metering roll obtained by this process Download PDFInfo
- Publication number
- WO2011072403A1 WO2011072403A1 PCT/CH2009/000402 CH2009000402W WO2011072403A1 WO 2011072403 A1 WO2011072403 A1 WO 2011072403A1 CH 2009000402 W CH2009000402 W CH 2009000402W WO 2011072403 A1 WO2011072403 A1 WO 2011072403A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- hard material
- coating
- metering roll
- process according
- layer
- Prior art date
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.
Landscapes
- Printing Plates And Materials Therefor (AREA)
- Manufacture Or Reproduction Of Printing Formes (AREA)
- Inking, Control Or Cleaning Of Printing Machines (AREA)
Abstract
The 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 (11) and at least one layer (12) of a hard material peripheral coating that is engraved by use of a laser beam. This process comprises at least a first step of melting superficially at least partially the hard material coating, a second step when the melted hard material solidifies and forms a flat surface free of engraving and a third step of engraving again the hard material coating with a laser beam within the re-melted zone.
Description
PROCESS FOR MANUFACTURING A METERING ROLL ESPECIALLY USABLE FOR FLEXOGRAPHIC PRINTING AND METERING ROLL OBTAINED BY THIS PROCESS Technical Field
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.
Background Art
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. For a new use of an existing used anilox roll, it has to be refurbished and the prior art technology to refurbish such an anilox roll consists in the following steps:
(a) 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.
(b) A second step consisting in applying a new coating on the turned or grinded and corundum-blasted surface of the anilox roll.
(c) A third step of grinding and polishing the new coating with diamond bands or similar to obtain a perfectly cylindrical and smooth surface.
(d) A fourth step of engraving the new coating with a laser or suitable mechanical tools.
This technology is very cost-effective. Disclosure of Invention
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.
Therefore, 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. According to a preferred realization 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. According to another realization 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.
According to a first application, said coating is a rough material deposited on said cylindrical core of a new metering roll.
According to a second application, 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. Brief Description of Drawings
The invention will now be described, by way of an example, with reference to the accompanying drawings, in which :
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, and
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.
Mode for Carrying Out the 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. For the first application, the process permits to modify the properties of the peripheral coating, especially the surface tension, the porosity, the hardness. For the second application 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.
According to the process of the invention, the steps for refurbishing used anilox rolls are the following :
(1) The existing hard material surface coating in ceramic, hard metal or hard metal components is melted to a depth sufficient to remove the engraving.
This operation may be done with a focused laser beam.
(2) The melted hard material solidifies and forms a flat surface free of engraving.
(3) 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
- a third step of engraving the polished surface with a laser beam.
According to the process of the invention, 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. Finally the densified and smoothened hard material coating can be engraved with a laser beam.
Claims
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 (1 1) and at least one layer (12) of a hard material peripheral coating, 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 the melted hard material, and a third step of engraving the solidified layer of said hard material.
A process according to claim 1 , characterized in that the first step consists in melting a superficial layer of a rough coating of hard material on the central cylindrical core of a new metering roll to realize a flat smooth surface without any unevenness ready to be engraved.
A process according to claim 1 , characterized in that 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 realize a flat smooth surface without any unevenness ready to be engraved.
A process according to any of the claim 1 to 3, characterized in that the first step is performed by at least one laser beam.
A process according to any of the claims 1 to 3, characterized in that the first step is performed by at least one plasma torch.
A process according to claim 1 , characterized in that said hard material coating obtained during the second step comprises at least a ceramic.
A process according to claim 1 , characterized in that said hard material coating obtained during the second step comprises at least a metal.
8. A process according to claim 1 , characterized in that said hard material coating obtained during the second step comprises at least a metallic component.
9. A process according to claim 1 , characterized in that the engraving during the third step is performed with at least one laser beam.
10. A metering roll (10) especially usable in flexographic printing presses, in varnish stations for offset presses and/or in short ink train dry offset presses for example, obtained by the process according to the preceding claims, said metering roll comprising a central cylindrical core (11) and at least one layer (12) of a hard material peripheral coating, characterized in that said coating comprises a superficially and at least partially melted and solidified layer (16) presenting a flat surface layer without any unevenness, said flat surface being engraved with at least one laser beam.
11. A metering roll according to the claim 10, characterized in that said coating is a rough material deposited on said cylindrical core of a new metering roll.
12. A metering roll according to the claim 11 , characterized in that 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.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP09796287.2A EP2512816B1 (en) | 2009-12-18 | 2009-12-18 | Process for manufacturing a metering roll especially usable for flexographic printing |
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 |
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 (1)
Publication Number | Publication Date |
---|---|
WO2011072403A1 true WO2011072403A1 (en) | 2011-06-23 |
Family
ID=42732504
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
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 |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP2512816B1 (en) |
WO (1) | WO2011072403A1 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0615861A1 (en) * | 1993-03-15 | 1994-09-21 | MAN Roland Druckmaschinen AG | Method of controlling the quantity of ink transferred from an anilox roller and for reconditioning worn out anilox rollers and construction of a renewable anilox roller |
GB2423053A (en) | 2005-02-10 | 2006-08-16 | Bernard John Boyle | Laser engraved liquid metering roller |
EP1967381A2 (en) * | 2007-03-08 | 2008-09-10 | Kurt Zecher GmbH | Engraved roller for printing machines and method for producing same |
-
2009
- 2009-12-18 EP EP09796287.2A patent/EP2512816B1/en not_active Not-in-force
- 2009-12-18 WO PCT/CH2009/000402 patent/WO2011072403A1/en active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0615861A1 (en) * | 1993-03-15 | 1994-09-21 | MAN Roland Druckmaschinen AG | Method of controlling the quantity of ink transferred from an anilox roller and for reconditioning worn out anilox rollers and construction of a renewable anilox roller |
GB2423053A (en) | 2005-02-10 | 2006-08-16 | Bernard John Boyle | Laser engraved liquid metering roller |
EP1967381A2 (en) * | 2007-03-08 | 2008-09-10 | Kurt Zecher GmbH | Engraved roller for printing machines and method for producing same |
Also Published As
Publication number | Publication date |
---|---|
EP2512816B1 (en) | 2015-03-25 |
EP2512816A1 (en) | 2012-10-24 |
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