EP3196042A2 - Farbkasten und verfahren zur gravur des farbkastens - Google Patents

Farbkasten und verfahren zur gravur des farbkastens Download PDF

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Publication number
EP3196042A2
EP3196042A2 EP17152982.9A EP17152982A EP3196042A2 EP 3196042 A2 EP3196042 A2 EP 3196042A2 EP 17152982 A EP17152982 A EP 17152982A EP 3196042 A2 EP3196042 A2 EP 3196042A2
Authority
EP
European Patent Office
Prior art keywords
ink duct
engraving
ink
walls
length
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.)
Withdrawn
Application number
EP17152982.9A
Other languages
English (en)
French (fr)
Other versions
EP3196042A3 (de
Inventor
Przemyslaw Kozlak
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zaklad Poligraficzny Pol-Mak PD Makowlak SpJ
Original Assignee
Zaklad Poligraficzny Pol-Mak PD Makowlak SpJ
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Zaklad Poligraficzny Pol-Mak PD Makowlak SpJ filed Critical Zaklad Poligraficzny Pol-Mak PD Makowlak SpJ
Publication of EP3196042A2 publication Critical patent/EP3196042A2/de
Publication of EP3196042A3 publication Critical patent/EP3196042A3/de
Withdrawn legal-status Critical Current

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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
    • B41N7/06—Shells for rollers of printing machines for inking rollers
    • 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
    • B41N2207/00—Location or type of the layers in shells for rollers of printing machines
    • B41N2207/02—Top layers

Definitions

  • This invention relates to a new shape for an ink duct and a method of engraving an ink duct.
  • Anilox rolls are widely used elements of printing machines. They are, among others, widely used in flexography, namely a type of relief printing process, in which a relief plate is used. Flexography is a rotary technology, which means that with each rotation of the printing cylinder a printed sheet is obtained.
  • a printing assembly in the flexographic printing machines is composed of a squeegee chamber, an anilox roll, a plate cylinder and an impression cylinder.
  • Flexographic printing utilizes low-viscosity inks. Ink is spread onto a printing plate only on image areas. The ink is transferred from ink ducts with help of an ink roll onto the anilox roll, and then onto the plate cylinder to which the printing plate is attached, and the image from the printing plate is transferred to the substrate pressed down by the impression cylinder.
  • Ink ducts are principally formed in the process of subjecting the working surface of the anilox roll to a laser beam, which results in obtaining the ink duct structure as a result of engraving.
  • the volume of ink transferred to the appropriate substrate depends among others on the ink ducts' structure, their volume, as well as their frequency of presence measured in lines per a unit of length.
  • the Polish patent application no. P-400602 discloses a method of manufacturing anilox rolls, wherein an anilox sleeve comprises an inner sleeve made of a compressible material and an outer sleeve. Ink ducts are engraved on the outer surface.
  • the method disclosed in that publication is characterised, among others, in that ink ducts are engraved with use of a NIR laser with a laser beam having a near-infrared wavelength range of 1070 nm.
  • a process of making anilox rolls that include ink ducts is also disclosed in the patent application no. US 2010/0015354 .
  • a pattern is formed with laser on the roller surface coated with a ceramic material, and the whole element is subject to polishing and cleaning of the outer surface.
  • Patent PL 172007 discloses a method and apparatus for engraving cylindrical moulds.
  • the method disclosed therein is characterised in that with the aid of a laser beam a coating of lacquer residing on the surface of a hollow cylindrical, rotating metal screen is removed at prescribed sample regions.
  • the removal of the coating of lacquer inside the sample regions is performed with a laser beam turned on continuously, the laser beam being turned off at the end of a respective sample region within a specified period of time.
  • Radiation retroreflected into the laser beam path at the metal screen is coupled out of the laser beam path in order not to delay switching off the laser beam.
  • the purpose of the invention thus became to develop a new structure of an ink duct, different from the generally used hexagonal structure (standard structure), in which all sides of the structure are equal and proportional.
  • An additional goal of the invention was to develop a method of obtaining the intended, novel ink duct structure.
  • the subject-matter of the invention is an ink duct engraved on the surface of an anilox roll.
  • the ink duct is composed of upper walls (a), side walls (b) and bottom walls (c) and is characterised in that the length of the side walls (b) of the ink duct is greater than the length of the upper walls (a) and the bottom walls (c).
  • the ink duct according to the invention is characterised in that the length of the side walls (b) of the ink duct is equal to or greater than 1.2 times the length of the upper walls (a) and the bottom walls (c), and most advantageously the ink duct is characterised in that the upper walls (a) of the ink duct are connected to the bottom walls (c) of the ink duct via channels.
  • the subject-matter of the invention is also a method of engraving an ink duct, which consists in that the ink duct is engraved by a beam of a NIR laser operating in a continuous mode within a system involving an external modulator.
  • This method is characterised in that a single laser beam is used, with shift of the laser head being between 8.3 ⁇ m and 31.3 ⁇ m.
  • the linear velocity around the perimeter of the anilox roll subject to engraving is between 58.0 cm/s and 87.0 cm/s, while pulse duration was between 6.7 ⁇ s and 20 ⁇ s.
  • the method was carried out with pulse amplitude between 110 W and 200 W, and wave frequency between 8.04 kHz and 26.8 kHz.
  • the angle of engraving was 60°.
  • Calibration parameters of the laser were adapted to 500 lines per centimeter and ink capacity of 2.6 cm 3 /m 2 .
  • the engraving was carried out on a surface of a ceramic material such as Cr 2 O 3 with thickness of 200 ⁇ m, hardness of 1250 Hv, porosity of 3,50% and roughness Ra of 0,10.
  • the shift of the laser head was set at 9.1 ⁇ m; and the linear velocity along the perimeter of the cylinder/anilox sleeve subject to engraving was 85.0 cm/s.
  • the laser beam's pulse duration was set to 6.7 ms with pulse amplitude of 200 W.
  • the generated wave frequency was 26,8 kHz.
  • the angle of the laser beam during the engraving was 60°.
  • Calibration parameters of the laser were adapted to 160 lines per centimeter and ink capacity of 7.5 cm 3 /m 2 .
  • the engraving was carried out on a surface of a ceramic material such as Cr 2 O 3 with thickness of 200 ⁇ m, hardness of 1250 Hv, porosity of 3.50% and roughness Ra of 0.16.
  • the shift of the laser head was set at 31.3 ⁇ m; and the linear velocity along the perimeter of the cylinder / anilox sleeve subject to engraving was 87.0 cm/s.
  • the laser beam's pulse duration was set to 20 ms with pulse amplitude of 110 W.
  • the generated wave frequency was 8.04 kHz.
  • the angle of the laser beam during the engraving was 60°.
  • Calibration parameters of the laser were adapted to 600 lines per centimeter and ink capacity of 3.0 cm 3 /m 2 .
  • the engraving was carried out on a surface of a ceramic material such as Cr 2 O 3 with thickness of 200 ⁇ m, hardness of 1250 Hv, porosity of 3.50% and roughness Ra of 0.09.
  • a ceramic material such as Cr 2 O 3 with thickness of 200 ⁇ m, hardness of 1250 Hv, porosity of 3.50% and roughness Ra of 0.09.
  • the shift of the laser head was set at 8.3 ⁇ m; and the linear velocity along the perimeter of the cylinder anilox sleeve subject to engraving was 58.0 cm/s.
  • the laser beam's pulse duration was set to 7.5 ms with pulse amplitude of 200 W.
  • the generated wave frequency was 20.09 kHz.
  • the angle of the laser beam during the engraving was 60°.
EP17152982.9A 2016-01-25 2017-01-25 Farbkasten und verfahren zur gravur des farbkastens Withdrawn EP3196042A3 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PL415898A PL415898A1 (pl) 2016-01-25 2016-01-25 Kałamarz farbowy oraz sposób grawerowania kałamarza farbowego

Publications (2)

Publication Number Publication Date
EP3196042A2 true EP3196042A2 (de) 2017-07-26
EP3196042A3 EP3196042A3 (de) 2017-08-02

Family

ID=58158757

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17152982.9A Withdrawn EP3196042A3 (de) 2016-01-25 2017-01-25 Farbkasten und verfahren zur gravur des farbkastens

Country Status (2)

Country Link
EP (1) EP3196042A3 (de)
PL (1) PL415898A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL232956B1 (pl) * 2017-08-23 2019-08-30 Rausz Rafal Grafix Centrum Poligrafii Struktura przestrzenna powierzchni poligraficznego cylindra aniloksowego do przenoszenia lakieru/farby przewodzącej na wałek lakierujący

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL172007B1 (pl) 1992-09-28 1997-07-31 Schablonentechnik Kufstein Ag Sposób i urzadzenie do grawerowania walcowych szablonów PL PL PL
US20100015354A1 (en) 2008-07-16 2010-01-21 Lee Tai-Cheung Method of making rollers with a fine pattern
PL400602A1 (pl) 2012-08-31 2014-03-03 Tewex-Repro Spólka Z Ograniczona Odpowiedzialnoscia Tuleja walca rastrowego i sposób wytwarzania tulei walców rastrowych

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4819558A (en) * 1985-04-18 1989-04-11 Pamarco Incorporated High efficiency fluid metering roll
DE9004666U1 (de) * 1990-04-25 1990-07-26 W. Haldenwanger Technische Keramik Gmbh & Co Kg, 1000 Berlin, De
US5143578A (en) * 1990-08-07 1992-09-01 Union Carbide Coatings Service Technology Corporation Method for engraving solid articles with laser beams
GB9311428D0 (en) * 1993-06-03 1993-07-21 Zed Instr Ltd Laser engraving apparatus
DK1101561T3 (da) * 1999-11-15 2006-05-01 Praxair Technology Inc Fremgangsmåde og anordning til gravering af en cylindrisk væskeoverføringsvalse med laserstråler
TWI471227B (zh) * 2007-12-21 2015-02-01 Apex Europ B V 以網紋滾輪印刷基板之方法、印刷方法用網紋滾輪及印刷裝置
WO2010089020A1 (de) * 2009-02-03 2010-08-12 Heidelberger Druckmaschinen Ag Verfahren zur herstellung von rasterwalzen
US9504164B2 (en) * 2012-05-04 2016-11-22 Eastman Kodak Company Manufacturing of high resolution conductive patterns using organometallic ink and banded anilox rolls

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL172007B1 (pl) 1992-09-28 1997-07-31 Schablonentechnik Kufstein Ag Sposób i urzadzenie do grawerowania walcowych szablonów PL PL PL
US20100015354A1 (en) 2008-07-16 2010-01-21 Lee Tai-Cheung Method of making rollers with a fine pattern
PL400602A1 (pl) 2012-08-31 2014-03-03 Tewex-Repro Spólka Z Ograniczona Odpowiedzialnoscia Tuleja walca rastrowego i sposób wytwarzania tulei walców rastrowych

Also Published As

Publication number Publication date
EP3196042A3 (de) 2017-08-02
PL415898A1 (pl) 2017-07-31

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