EP0728579B1 - Râcle pour machine d'impression en creux, procédé et dispositif pour sa fabrication - Google Patents

Râcle pour machine d'impression en creux, procédé et dispositif pour sa fabrication Download PDF

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Publication number
EP0728579B1
EP0728579B1 EP95102802A EP95102802A EP0728579B1 EP 0728579 B1 EP0728579 B1 EP 0728579B1 EP 95102802 A EP95102802 A EP 95102802A EP 95102802 A EP95102802 A EP 95102802A EP 0728579 B1 EP0728579 B1 EP 0728579B1
Authority
EP
European Patent Office
Prior art keywords
doctor blade
cathodes
gap
treated
approximately
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.)
Expired - Lifetime
Application number
EP95102802A
Other languages
German (de)
English (en)
Other versions
EP0728579A1 (fr
Inventor
Rolf Meyer
Karl Prof. Dipl.-Ing. Schekulin
Klaus Kohberger
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.)
Individual
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Individual
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 Individual filed Critical Individual
Priority to DK95102802T priority Critical patent/DK0728579T3/da
Priority to DE59502332T priority patent/DE59502332D1/de
Priority to EP95102802A priority patent/EP0728579B1/fr
Priority to AT95102802T priority patent/ATE166613T1/de
Publication of EP0728579A1 publication Critical patent/EP0728579A1/fr
Application granted granted Critical
Publication of EP0728579B1 publication Critical patent/EP0728579B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F9/00—Rotary intaglio printing presses
    • B41F9/06—Details
    • B41F9/08—Wiping mechanisms
    • B41F9/10—Doctors, scrapers, or like devices
    • B41F9/1072—Blade construction

Definitions

  • the invention relates to a doctor blade for cooperation with the Surface of a gravure cylinder and a method and a device for producing such a doctor blade.
  • rotogravure machines are in the surface of the Form cylinder wells etched or engraved with the color to be transferred to the paper web contain.
  • the excess ink is removed from the roller surface removed by means of a squeegee.
  • This is a thin steel sheet with resilient properties.
  • the Squeegee is made of high-strength, wear-resistant material manufactured so that the highest possible number of copies with each a squeegee can be printed.
  • the engraved or etched The surface layer of the gravure cylinder usually exists Made of copper and is to achieve higher wear resistance chrome-plated. Let with such known doctor blade arrangements only in exceptional cases more (cylinder revolutions) reach as a million because if you exceed this Number both the wear of the doctor blade and the cylinder surface do not allow adequate print quality.
  • the invention has for its object the doctor blade wear and / or reduce cylinder wear to higher To reach circulation numbers or one for a given circulation number to enable higher print quality.
  • the invention solves this problem by the features of Claim 1.
  • a method for producing an inventive Doctor blade is specified in claim 6, a device for Implementation of this method in claim 13.
  • the electrochemical The removal process as such is state of the art is known and is described, for example, in Maschinenre 95 (1989, No. 36, pages 94 to 97).
  • the invention is based on the knowledge that the electrochemical Removal process (also electro chemical machining or Called ECM process) not only deburred the squeegee, but Surprisingly, a tribological change in the doctor surface causes such that in the operation of the invention Squeegee the above-described constant formation of ridges and nicks is avoided and the lifespan so significantly increased.
  • electrochemical Removal process also electro chemical machining or Called ECM process
  • a squeegee according to the invention has a completely different surface structure. It is about a uniform crater structure with many very small craters or bags that have approximately the shape of spherical caps. These craters or pockets usually form along the grain boundaries of the doctor blade material. This changed Surface structure creates a completely new tribological Mating between gravure roll and doctor blade, in particular the wing is increased.
  • the contact pressure of the invention Squeegees can be compared to conventional squeegees Be reduced by half.
  • the doctor blade according to the invention is advantageously made of steel manufactured. Their training as Thin section squeegee. A thin-section squeegee points at its tip a plane-parallel or approximately plane-parallel lamella, which lies against the rotogravure roller. Such a doctor blade does not have to be resharpened, but is used until the Slat is worn off. With such a thin section squeegee it is of course of particular advantage if the ridges and Pitting of the prior art is avoided.
  • At least the lamella surface is advantageously the Thin-section doctor blade subjected to an electrochemical removal process been.
  • about 3 to 40% is preferred about 5 to 20%, more preferably about 10% of the Doctor blade surface subjected to an electrochemical removal process been. It is not necessary those surface areas to treat the doctor blade electrochemically in the Support squeegees are clamped and with the cylinder surface cannot come into contact.
  • the invention further relates to a method for electrochemical Removing material from the surface of a squeegee.
  • the doctor blade to be treated is an anode in a gap arranged between at least two cathodes.
  • an electrolyte for example an aqueous sodium chloride or Sodium nitrate solution.
  • cathodes are only in arranged in the gap area in which the to be treated Part of the doctor surface is located.
  • the method is advantageously a Continuous process in which the doctor blade to be treated as Doctor tape preferably passes continuously through the gap.
  • gap includes everyone in the context of this application appropriate space between the cathodes that carry out of electrochemical removal allowed.
  • anodic surface treatment limited only a part of the doctor surface by which Reduce power consumption and thus heat development.
  • the removal process is limited to a part of the doctor blade width and thus reduces the electrochemical active area, while still the entire doctor blade width for anode contact and is therefore available for the power supply.
  • the concentration of the available electricity to a smaller one Effective area increases the current density in this effective area and hence the electrochemical removal rate.
  • the surface area to be treated is advantageously a laminar flow of electrolyte flows around the doctor blade. On this way, an undesired passivation of the to be treated Squeegee surface avoided or reduced.
  • the doctor surface subjected to the electrochemical removal process according to the invention is advantageously a Roll electrode used. But it can also be a used plate electrode resilient on the squeegee will.
  • the voltage present between the anode and cathodes is advantageously 2 to 20 V, preferably about 4 to 10 V.
  • the current strength used is advantageously 50 to 600 A, preferably about 100 to 200 A.
  • the inventive device for performing the inventive Method has a gap in which the Doctor blade arranged as an anode between at least two cathodes is.
  • the cathodes are only arranged in the gap area in which the part of the doctor surface to be treated is located located. This arrangement is advantageously chosen so that about 3 to 40%, preferably about 5 to 20%, further preferably about 10% of the doctor surface electrochemically be treated.
  • the doctor blade is used for anode contacting advantageously used a roller electrode.
  • Fig. 1 is a thin-section doctor blade according to the invention Squeegee 1 shown. It lies with the top of one Lamella 2 on a gravure cylinder 3. It is from one Support squeegee 4, which in turn is held in a squeegee holder 5 is clamped.
  • the doctor blade 1 is usually between 0.15 and 0.4 mm thick, the thickness of the lamella 2 is approximately 0.05 to 0.1 mm.
  • the width of the lamella 2 is usually between 0.6 and 1.8 mm. Only when the slat is torn off in this width squeegee 1 must be replaced.
  • the Overall width of the doctor blade 1 is generally between about 10 and 60 mm.
  • Fig. 2 shows schematically the device for electrochemical Squeegee treatment.
  • An endless squeegee belt 1 runs through one arranged between the plate cathodes 6 and 7 Processing gap 8 in which there is electrolyte.
  • One with anode roller 9 connected to the positive pole of a direct current source contacts the doctor blade 1.
  • the roller is drivable and transports the doctor blade 1 through the processing gap 8.
  • There may be additional, not shown in the drawing Transport devices for the doctor blade 1 are available.
  • the Plate cathodes 6, 7 are with the negative pole of this current source connected. Spacers 10, which are preferably made of ceramic Material exist, prevent the doctor blade 1, the plate cathodes 6, 7 touched and a short circuit occurs.
  • the doctor blade Before entering the electrochemical processing station the doctor blade is usually mechanically pre-ground and degreased.
  • the resulting iron hydroxide is filtered out of the electrolyte, the resulting hydrogen is sucked off and with Air so diluted that no deflagration can occur.
  • the electrochemical removal process is similar to that of pre-grinding resulting chastity and changes the stroke geometry of the treated surface part in that described above dome-like crater structure.
  • 3 to 5 is the electrochemical processing station presented in detail.
  • the plate electrodes or -cathodes 6, 7 limit the area passed by the doctor blade 1 Machining gap up and down. 3 and 4 is can be seen that the plate electrodes 6, 7 over a large Part of the width of the machining gap with an insulating layer 11 are provided.
  • the doctor blade strip connected as an anode 1 are therefore only in the area passing through the lamella 2 of the machining gap cathodes 6, 7 opposite. It takes place therefore only in the area of this slat 2 and in one immediately adjacent surface area of the doctor blade 1 an electrochemical Material removal instead.
  • the plate electrodes 6, 7 have electrolyte chambers 12, which are fed with inlets 13 with electrolyte solution.
  • An aqueous sodium chloride or sodium nitrate solution is preferred used.
  • the electrolyte solution flows through openings 14 from the electrolyte chambers 12 into the machining gap. It this creates a laminar flow of electrolyte between the Doctor blade 1 and the plate electrodes 6, 7.
  • the electrolyte solution emerges from the side of the machining gap, through Collected facilities, not shown, filtered, and returned to the electrolyte chambers 12 in the circuit.

Claims (15)

  1. Racle caractérisée en ce qu'au moins une partie de sa surface a subi un processus de décapage électro-chimique.
  2. Racle selon la revendication 1, caractérisée en ce qu'elle est fabriquée en acier.
  3. Racle selon la revendication 1 ou 2, caractérisée en ce qu'elle est constituée comme une racle à lame mince 1.
  4. Racle selon la revendication 3, caractérisée en ce qu'au moins la surface des lamelles de la racle 1 à lame mince a subi un processus de décapage électro-chimique.
  5. Racle selon l'une quelconque des revendications 1 à 4, caractérisée en ce que entre 3 % et 40 % environ, de préférence entre 5 % et 20 % environ, de façon encore plus préférable 10 % environ de la surface de la racle ont subi un processus de décapage électrochimique.
  6. Procédé de décapage électrochimique par enlèvement de matière à la surface d'une racle (1), dans lequel la racle (1) est disposée comme une anode dans un espace ou écartement (8) entre au moins deux cathodes (6, 7), caractérisé en ce que seulement une partie de la surface de la racle est traitée électrochimiquement et en ce que les cathodes (6, 7) ne sont disposées que dans la zone de l'écartement où se trouve la partie à traiter de la surface de la racle.
  7. Procédé selon la revendication 6, caractérisé en ce qu'il s'agit d'un procédé continu dans lequel la bande (1) de la racle à traiter traverse l'écartement (8).
  8. Procédé selon la revendication 6 ou 7, caractérisé en ce que la zone de la surface à traiter de la racle (1) baigne dans un flux électrolytique laminaire.
  9. Procédé selon l'une quelconque des revendications 6 à 8, caractérisé en ce que entre 3 % et 40 % environ, de préférence entre 5 % et 20 % environ, de façon plus préférable 10 % environ de la surface de la racle ont subi un processus de décapage électrochimique.
  10. Procédé selon l'une quelconque des revendications 6 à 9, caractérisé en ce que l'on utilise une électrode de cylindre (9) pour établir le contact avec une racle (1).
  11. Procédé selon l'une quelconque des revendications 6 à 10, caractérisé en ce que la tension existant entre l'anode et les cathodes (6, 7) est comprise entre 2 V et 20 V environ, de préférence entre 4 V et 10 V environ.
  12. Procédé selon l'une quelconque des revendications 6 à 11, caractérisé en ce que l'intensité du courant est comprise entre 50 A et 600 A environ, de préférence entre 100 A et 200 A environ.
  13. Dispositif pour le décapage électrochimique par enlèvement de matière à la surface d'une racle (1), comprenant un espace ou écartement (8) dans lequel la racle (1) est disposée comme une anode entre au moins 2 cathodes (6, 7), caractérisé en ce que les cathodes (6, 7) ne sont disposées que dans la zone de l'écartement (8) où se trouve la partie à traiter de la surface de la racle.
  14. Dispositif selon la revendication 13, caractérisé en ce que les cathodes (6, 7) sont disposées de façon telle que 3 % à 40 % environ, de préférence 5 % à 20 % environ, de façon plus préférable 10 % environ de la surface de la racle ont été traités électrochimiquement.
  15. Dispositif selon la revendication 13 ou 14, caractérisé en ce qu'il comprend au moins une électrode (9) de cylindre pour établir le contact avec la racle (1).
EP95102802A 1995-02-27 1995-02-27 Râcle pour machine d'impression en creux, procédé et dispositif pour sa fabrication Expired - Lifetime EP0728579B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DK95102802T DK0728579T3 (da) 1995-02-27 1995-02-27 Rakel til dybtryk-rotationsmaskiner samt fremgangsmåde og anordning til dens fremstilling
DE59502332T DE59502332D1 (de) 1995-02-27 1995-02-27 Rakel für Tiefdruck-Rotationsmaschinen sowie Verfahren und Vorrichtung zu deren Herstellung
EP95102802A EP0728579B1 (fr) 1995-02-27 1995-02-27 Râcle pour machine d'impression en creux, procédé et dispositif pour sa fabrication
AT95102802T ATE166613T1 (de) 1995-02-27 1995-02-27 Rakel für tiefdruck-rotationsmaschinen sowie verfahren und vorrichtung zu deren herstellung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP95102802A EP0728579B1 (fr) 1995-02-27 1995-02-27 Râcle pour machine d'impression en creux, procédé et dispositif pour sa fabrication

Publications (2)

Publication Number Publication Date
EP0728579A1 EP0728579A1 (fr) 1996-08-28
EP0728579B1 true EP0728579B1 (fr) 1998-05-27

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP95102802A Expired - Lifetime EP0728579B1 (fr) 1995-02-27 1995-02-27 Râcle pour machine d'impression en creux, procédé et dispositif pour sa fabrication

Country Status (4)

Country Link
EP (1) EP0728579B1 (fr)
AT (1) ATE166613T1 (fr)
DE (1) DE59502332D1 (fr)
DK (1) DK0728579T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1349986B1 (fr) 2000-12-07 2006-06-07 Swedev Aktiebolag Racle ou racle de coucheuse et procede de fabrication associe

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE220992T1 (de) * 1997-10-08 2002-08-15 Rolf Meyer Druckrakel und verfahren zur herstellung derselben
US6155167A (en) * 1999-01-21 2000-12-05 Meyer; Rolf Printing doctor with a coating of hard material and method for producing same
EP1092535A1 (fr) * 1999-10-13 2001-04-18 Think Laboratory Co., Ltd. Racle
CN106892487A (zh) * 2017-03-17 2017-06-27 上海复禹环境科技有限公司 立式圆柱型横向导流式自动刮垢电化学水处理系统

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE437683B (sv) * 1982-10-13 1985-03-11 Inventing Ab Schaber eller rakel - anliggande mot valsen - vid exv tryck-, ferg-, eller kreppning
SE447362B (sv) * 1985-06-14 1986-11-10 Kanthal Dev Ab Schaberklinga

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1349986B1 (fr) 2000-12-07 2006-06-07 Swedev Aktiebolag Racle ou racle de coucheuse et procede de fabrication associe
EP1349986B2 (fr) † 2000-12-07 2016-10-19 Swedev Aktiebolag Racle ou racle de coucheuse et procede de fabrication associe

Also Published As

Publication number Publication date
ATE166613T1 (de) 1998-06-15
EP0728579A1 (fr) 1996-08-28
DE59502332D1 (de) 1998-07-02
DK0728579T3 (da) 1999-03-22

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