EP2393661A1 - Verfahren zur herstellung von rasterwalzen - Google Patents
Verfahren zur herstellung von rasterwalzenInfo
- Publication number
- EP2393661A1 EP2393661A1 EP10702994A EP10702994A EP2393661A1 EP 2393661 A1 EP2393661 A1 EP 2393661A1 EP 10702994 A EP10702994 A EP 10702994A EP 10702994 A EP10702994 A EP 10702994A EP 2393661 A1 EP2393661 A1 EP 2393661A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- laser
- engraving
- pulse
- roller
- anilox
- 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
- 238000007774 anilox coating Methods 0.000 title claims abstract description 33
- 238000004519 manufacturing process Methods 0.000 title claims description 13
- 239000000463 material Substances 0.000 claims abstract description 14
- 238000010002 mechanical finishing Methods 0.000 claims abstract 2
- 238000000034 method Methods 0.000 claims description 34
- 238000010147 laser engraving Methods 0.000 claims description 15
- 239000000919 ceramic Substances 0.000 claims description 11
- 238000007639 printing Methods 0.000 claims description 9
- 238000004140 cleaning Methods 0.000 claims description 7
- 238000000227 grinding Methods 0.000 claims description 5
- 239000000835 fiber Substances 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- 238000007750 plasma spraying Methods 0.000 claims description 2
- 230000005855 radiation Effects 0.000 claims 3
- 229940090961 chromium dioxide Drugs 0.000 claims 1
- IAQWMWUKBQPOIY-UHFFFAOYSA-N chromium(4+);oxygen(2-) Chemical group [O-2].[O-2].[Cr+4] IAQWMWUKBQPOIY-UHFFFAOYSA-N 0.000 claims 1
- AYTAKQFHWFYBMA-UHFFFAOYSA-N chromium(IV) oxide Inorganic materials O=[Cr]=O AYTAKQFHWFYBMA-UHFFFAOYSA-N 0.000 claims 1
- 229910010293 ceramic material Inorganic materials 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 238000007645 offset printing Methods 0.000 description 3
- 239000003973 paint Substances 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000002679 ablation Methods 0.000 description 2
- 229910003460 diamond Inorganic materials 0.000 description 2
- 239000010432 diamond Substances 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- 229910052769 Ytterbium Inorganic materials 0.000 description 1
- 238000005524 ceramic coating Methods 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 239000012459 cleaning agent Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007730 finishing process Methods 0.000 description 1
- 238000007646 gravure printing Methods 0.000 description 1
- 239000013072 incoming material Substances 0.000 description 1
- 230000005923 long-lasting effect Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C1/00—Forme preparation
- B41C1/02—Engraving; Heads therefor
- B41C1/04—Engraving; Heads therefor using heads controlled by an electric information signal
- B41C1/05—Heat-generating engraving heads, e.g. laser beam, electron beam
-
- 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
Definitions
- the invention relates to a process for the production of anilox rollers, in particular z.
- anilox rollers those that are used under the name "anilox rollers" in so-called short inking units of offset printing machines to take in conjunction with a doctor blade or a chambered doctor blade paint from a paint reservoir and to promote more rollers in the direction of the printing plate.
- anilox rolls are also used in coating plants to meter the amount of paint to be applied and, in addition to offset printing, are also used in other printing processes, such as flexographic printing or in the corresponding machines, for example
- the etching process has been structured by etching or mechanically engraved by a stylus penetrating into the soft copper skin on a steel roll body, and recently engraved with laser tools as described, for example, in the article "Universal Anilox Rolls for the Printing Press" the magazine “Flexo and Gravure Printing", Issue 2, 2004.
- the anilox rollers intended for use in anilox inking units are usually provided on the surface with a hard ceramic layer for the purpose of longer service life.
- problems occur. Often, after a relatively short lifetime, streaks appear in the print image due to the fact that ceramic particles detach from the anilox roller, jam against the cutting edge of the doctor blade and then generate grooves on the roller surface. The reason for this lies in the manufacturing process of laser engraving. Because there were previously used thermal YAG laser or CO 2 laser whose laser pulses partially evaporate material from the wells produced by them, but partly also drive out in the molten state, in which case the material on both sides of the generated depression as a "mountain" precipitates on the surface.
- Sand grinding passes with a finer diamond abrasive to the desired surface roughness (EP 0 396 114 B1). After each second grinding pass was Measure the roughness and scoop volume of the roller to ensure that the grinding process does not "overrun" the desired optimum, which is a complex process that is difficult to reproduce and takes a long time to complete.
- the recesses in the laser engraving are produced by a repetitively operated short-pulse laser, wherein in each case a plurality of laser pulses are used to work out the depression in the cross-sectional profile.
- Pulse repetition rates do not concentrate in the laser pulses.
- the lasers used according to the invention preferably fiber lasers or disk lasers, deliver laser pulses in the range between 20 picoseconds and 200 nanoseconds and average laser powers in the range between 10 watts to several 100 watts. It is important that the used short-pulse laser provides sufficient energy density to optimally use the built-in light energy for ablation of the material to be processed.
- the incoming material on the average power must be large enough to ablate, for example, in the case of anilox rolls having a ceramics surface with a pick-up volume of typically 3 cm 3 is at least 0.5 cm 3 ceramic material per hour. Because otherwise the processing time for the laser engraving of a roller would be unacceptably long or the simultaneous use of multiple lasers, the plant technical effort will be too large.
- a suitable for the processing of anilox rollers short pulse laser generates z.
- Anilox inking in anilox inking customary Well depths readily reach, wherein for working out the cross-sectional profile in each case a plurality of laser pulses be placed one behind the other, typically 5 to 100 laser pulses depending on the width and depth of the wells or Haschuren.
- Wells with relatively smooth clean flanks can be produced with this number of pulses and, incidentally, the cross-sectional flank shape of the wells or hafors can be influenced in such a way that, compared to the other methods mentioned at the beginning, one is responsible for the ink release / acceptance behavior of the wells good geometry yields.
- the anilox roller is then engraved in several passes, so that the cross-sectional shape is worked out in several superimposed layers by the laser pulses.
- the pulse repetition rate of the laser is several 100,000 kHz.
- an anilox roller for a 35/50 cm printing unit can be engraved within a few hours at speeds between 100 and 1,000 rpm.
- the laser engraving is followed by a finishing step and / or a cleaning step, for. B. in the same clamping of the roller as in the previous laser engraving itself, wherein the finishing step or cleaning step, however, can also be done manually, for example, by polishing or wiping the lasered rollers z. B. with a cleaning agent, either still in the set or after it was taken out of the clamping.
- cleaning the roll in an ultrasonic bath may be sufficient, and in some cases, such a finishing step may be completely eliminated.
- Example 1 a) Was provided with a bearing journal steel roller ST52 with a cylinder length L of 560 mm and a diameter D of 180 mm of the cylinder jacket. This turned into shape roll body was then provided in a plasma spraying on the cylinder jacket with a chromium oxide layer with a thickness of 0.275 mm.
- This system contains a repetitively operated ytterbium fiber laser with a pulse duration of 130 ns at a repetition rate of 500 kHz.
- the average power of the laser was 150 W, it delivered a pulse peak power of
- the hafs are said to extend over the cylinder surface at a line of 90 L / cm in a variety of steep spirals.
- the pulsing of the laser was very synchronized with the speed of the roller.
- the speed was set from 150 W to 750 rpm in consideration of the maximum pulse repetition frequency of 500 kHz and the average power of the laser, in order to achieve the required width and depth of the hurdles.
- 6 pulses resulted over the cross section of the Haschur, with which the cross-sectional shape was machined out of the material, before the pulses in the region of the web between the Haschuren each short interrupted, d. H. there 2 laser pulses were suppressed.
- the advance of the laser unit along the cylinder axis was 5 ⁇ m per revolution of the roll, i. H. at the set speed of 750 rpm, the engraving process over the cylinder length L of 560 millimeters took about 2.4 hours.
- the thus structured anilox roll was then subjected to a second finishing step.
- the engraved surface was in two overflows with a 4000 grain honing stone with a lower contact pressure of about 1 bar at a speed of 200 rev / min, at a feed rate of 600 mm / min. smoothed.
- roller thus treated could then be installed in the printing unit of a sheet-fed offset printing machine type SM52 and provide there as anilox anilox roll their service.
- the roller speed was reduced to 250 rpm, and the axial feed rate was increased to 7.5 ⁇ m / rev at otherwise identical settings for the laser.
- the roller speed was reduced to 250 rpm, and the axial feed rate was increased to 7.5 ⁇ m / rev at otherwise identical settings for the laser.
- the structured anilox roll was not honed again but polished manually for about 10 minutes.
- the thus obtained anilox roll had comparable good properties to those of Example 1.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Plasma & Fusion (AREA)
- Manufacturing & Machinery (AREA)
- Manufacture Or Reproduction Of Printing Formes (AREA)
- Printing Plates And Materials Therefor (AREA)
- Laser Beam Processing (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102009007281 | 2009-02-03 | ||
PCT/EP2010/000172 WO2010089020A1 (de) | 2009-02-03 | 2010-01-14 | Verfahren zur herstellung von rasterwalzen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2393661A1 true EP2393661A1 (de) | 2011-12-14 |
EP2393661B1 EP2393661B1 (de) | 2015-06-10 |
Family
ID=42235248
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10702994.4A Active EP2393661B1 (de) | 2009-02-03 | 2010-01-14 | Verfahren zur herstellung von rasterwalzen |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2393661B1 (de) |
CN (1) | CN102307730B (de) |
DE (1) | DE102010004632A1 (de) |
WO (1) | WO2010089020A1 (de) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103171276A (zh) * | 2011-12-23 | 2013-06-26 | 上海运城制版有限公司 | 光学薄膜印刷用陶瓷网纹辊 |
DE102014225559A1 (de) * | 2014-01-23 | 2015-07-23 | Heidelberger Druckmaschinen Ag | Rasterwalze |
DE102014110285A1 (de) * | 2014-07-22 | 2016-01-28 | Thyssenkrupp Ag | Einrichtung und Verfahren zum Strukturieren einer Walze durch Laserabtrag |
CN104626728A (zh) * | 2015-02-03 | 2015-05-20 | 龙游运城压纹制版有限公司 | 一种压纹辊的雕刻方法 |
CN105563291B (zh) * | 2015-12-16 | 2017-12-12 | 广东光泰激光科技有限公司 | 一种提高陶瓷网纹辊合格率的加工方法 |
PL415898A1 (pl) * | 2016-01-25 | 2017-07-31 | Zakład Poligraficzny Pol-Mak P.D. Makowiak Spółka Jawna | Kałamarz farbowy oraz sposób grawerowania kałamarza farbowego |
CN105882110A (zh) * | 2016-04-28 | 2016-08-24 | 广东光泰激光科技有限公司 | 一种小辊径网纹辊无色差螺旋纹雕刻方法 |
CN109109457B (zh) * | 2018-08-03 | 2022-05-24 | 常州龙润激光科技有限公司 | 一种网纹辊及其制造方法 |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3636251A (en) * | 1968-08-28 | 1972-01-18 | Quantronix Corp | Laser facsimile system for engraving printing plates |
US5093180A (en) | 1989-05-02 | 1992-03-03 | Union Carbide Coatings Service Technology Corporation | Liquid transfer articles and method for producing them |
US5047116A (en) * | 1989-05-31 | 1991-09-10 | Union Carbide Coatings Service Technology Corporation | Method for producing liquid transfer articles |
US5143578A (en) * | 1990-08-07 | 1992-09-01 | Union Carbide Coatings Service Technology Corporation | Method for engraving solid articles with laser beams |
CA2349912A1 (en) * | 2000-07-07 | 2002-01-07 | Heidelberger Druckmaschinen Aktiengesellschaft | Setting an image on a printing plate using ultrashort laser pulses |
CN1451537A (zh) * | 2003-04-28 | 2003-10-29 | 湖南百富瑞材料有限责任公司 | 一种陶瓷网纹辊的生产和修复方法 |
CN101184630A (zh) * | 2005-06-06 | 2008-05-21 | 株式会社新克 | 凹版制版辊及其制造方法 |
DE102007011708A1 (de) | 2007-03-08 | 2008-09-11 | Kurt Zecher Gmbh | Rasterwalze für Druckmaschinen sowie Herstellungsverfahren |
DE102007032903A1 (de) * | 2007-07-14 | 2009-01-15 | Schepers Gmbh + Co. Kg | Verfahren zum Betreiben einer Lasergravureinrichtung |
CN101224660B (zh) * | 2008-01-18 | 2010-09-15 | 深圳职业技术学院 | 网纹辊及其制造工艺 |
-
2010
- 2010-01-14 EP EP10702994.4A patent/EP2393661B1/de active Active
- 2010-01-14 WO PCT/EP2010/000172 patent/WO2010089020A1/de active Application Filing
- 2010-01-14 CN CN201080006543.4A patent/CN102307730B/zh active Active
- 2010-01-14 DE DE102010004632A patent/DE102010004632A1/de not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO2010089020A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN102307730A (zh) | 2012-01-04 |
CN102307730B (zh) | 2014-04-16 |
DE102010004632A1 (de) | 2010-08-05 |
WO2010089020A1 (de) | 2010-08-12 |
EP2393661B1 (de) | 2015-06-10 |
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