EP0911157B1 - Racle pour l'enlèvement de l'encre superflue de la surface d'une plaque - Google Patents

Racle pour l'enlèvement de l'encre superflue de la surface d'une plaque Download PDF

Info

Publication number
EP0911157B1
EP0911157B1 EP97118522A EP97118522A EP0911157B1 EP 0911157 B1 EP0911157 B1 EP 0911157B1 EP 97118522 A EP97118522 A EP 97118522A EP 97118522 A EP97118522 A EP 97118522A EP 0911157 B1 EP0911157 B1 EP 0911157B1
Authority
EP
European Patent Office
Prior art keywords
doctor blade
wear
coating
printing form
particles
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
EP97118522A
Other languages
German (de)
English (en)
Other versions
EP0911157A1 (fr
Inventor
Max Dätwyler
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.)
Daetwyler Swisstec AG
Daetwyler Global Tec Holding AG
Original Assignee
MDC Max Daetwyler AG Bleienbach
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
Priority to EP97118522A priority Critical patent/EP0911157B1/fr
Application filed by MDC Max Daetwyler AG Bleienbach filed Critical MDC Max Daetwyler AG Bleienbach
Priority to ES97118522T priority patent/ES2171808T3/es
Priority to DE59706505T priority patent/DE59706505D1/de
Priority to PCT/CH1998/000447 priority patent/WO1999021716A1/fr
Priority to JP11522879A priority patent/JP2000516171A/ja
Priority to BR9806272-7A priority patent/BR9806272A/pt
Priority to US09/331,751 priority patent/US6305282B1/en
Publication of EP0911157A1 publication Critical patent/EP0911157A1/fr
Application granted granted Critical
Publication of EP0911157B1 publication Critical patent/EP0911157B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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 scraping off superfluous printing ink from the surface of a printing form according to the preamble of claim 1.
  • a doctor blade which is used for example in the gravure printing process is known from US-A-4,184,429.
  • the squeegee consists of a rear squeegee part, which is installed in a holder, and a front lamella, which rests with a certain pressure on the surface of the printing form.
  • the lamella is much thinner than the rear squeegee part (its thickness is approximately half the thickness of the rear squeegee part).
  • the advantage of this squeegee is that when the front contact zone interacting with the surface of the printing form is worn, this contact zone remains as unchanged and unaffected as possible in its size or geometry required for the required print quality until the entire width of the lamella is used up or worn.
  • the constant geometry in the contact area and thus the constant doctor blade pressure make manual readjustment of the contact pressure superfluous and enable constant print quality.
  • doctor blades which are formed from a thin sheet metal clamped between two support plates and having a constant thickness over the entire doctor blade width, as are known, for example, from US Pat. No. 2,313,830. 5 of this document discloses a doctor blade consisting of two steel lamellae and having an intermediate lubricant layer, which is coated in the front area with a wear-resistant material.
  • FIGS. 3 and 4 of US-A-2,313,830 A generic doctor blade, which is provided on one side with a coating containing lubricant particles, is disclosed in FIGS. 3 and 4 of US-A-2,313,830.
  • the present invention has for its object to provide a doctor blade, in which both the wear on the surface of the printing form and the doctor blade wear are significantly reduced.
  • the front portion of the doctor blade interacting with the surface of the printing form is provided with a coating over the entire doctor blade length on at least one side, which in addition to lubricant particles also has particles of a wear-resistant material, results in a particularly effective reduction in doctor blade wear and an increase in The squeegee has reached the end of its service life and at the same time protects the printing form surface from wear. It is advantageous here that the coating according to the invention can be applied subsequently to the doctor blade produced as before, which is simple and inexpensive to manufacture.
  • a doctor blade 1 consists of a rear doctor blade part 2 and a front section in the form of a front lamella 3 which is integral with the latter and which is thinner than the rear squeegee part 2.
  • the thickness D1 of the rear squeegee part 2 is approx. 150 ⁇ , that of the lamella 3 (D2) approx. 50 ⁇ .
  • the upper side of the lamella 3 is designated in Fig. 1 with 3a, the lower with 3b.
  • the doctor blade width B1 can be, for example, 8-80 mm, as required, the lamella width B2 being approximately 1 mm.
  • the squeegee can have different squeegee lengths - measured in a plane perpendicular to the plane of the drawing.
  • the squeegee 1 is installed with its rear squeegee part 2 in a holder not shown in the drawing, optionally together with a support squeegee.
  • the lamella 3 is pressed under a certain pressure onto the surface of a printing form 10, for example a gravure cylinder, indicated schematically by dashed lines in the drawing, in order to scrape off the excess printing ink from the printing form.
  • the direction of rotation of the printing form 10 is indicated by an arrow D.
  • the front contact zone of the lamella 3 coming into contact with the printing form is designated by 4 in FIG. 1.
  • the exact geometry of the doctor blade, its positioning relative to the printing form and its advantages are known, for example, from US Pat. No. 4,184,429 and are therefore not described in more detail here.
  • the lamella 3 and also the area of the rear doctor blade part 2 adjoining the lamella 3 are covered over the entire doctor blade length with a Provide coating 5, which consists of lubricant or has at least lubricant particles.
  • the lubricant present in the contact area considerably reduces the friction between the doctor blade 1 and the surface of the printing form 10 and reduces the wear on the printing form surface.
  • the coating 5 can advantageously comprise a carrier material 7 in which both lubricant particles 8 and particles 9 of a wear-resistant material are embedded (the particles 8 and 9 are indicated schematically in FIG. 2). While the last-mentioned particles 9 reduce the wear of the doctor blade 1 or the lamella 3 and increase their service life, the lubricant particles 8 ensure that the wear on the printing forme surface - despite the presence of the doctor blade wear reducing the risk of damage to the printing forme surface increasing particles 9 - is significantly reduced.
  • the coating 5 has a thickness of a few ⁇ m, the lubricant particles 8 and the particles 9 of a wear-resistant material are smaller than 1 ⁇ m.
  • the coating 5 can be applied to the already finished doctor blade in various ways, e.g. chemical, galvanic, by spraying or gluing.
  • both sides 3a, 3b of the front section or the lamella 3 are coated.
  • only one of these sides 3a, 3b, preferably the side 3b facing the direction of rotation D of the printing form 10, could also be coated according to the invention.
  • one of the sides 3a, 3b with the coating consisting of lubricant or containing lubricant particles and the other side with a coating comprising the particles of a wear-resistant material.
  • the coating according to the invention could also be used in doctor blades which are known, for example, from US Pat. No. 5,638,751.
  • an intermediate part (reference number 16), which is thicker than the front section and thinner than, is arranged between the front section (reference number 18 according to US Pat. No. 5,638,751) which cooperates with the surface of the printing form and the rear squeegee part (reference number 14) is the rear squeegee part.
  • the front section could be coated in the manner described above.
  • the rear doctor blade part and the front section are formed in one piece
  • the rear part of the doctor blade coated according to the invention can be made of consist of two or more superimposed and interconnected parts or layers.
  • doctor blades which are formed from a thin sheet metal clamped between two support plates and have a constant thickness over the entire doctor blade width, can be equipped with the coating according to the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Coating Apparatus (AREA)
  • Rotary Presses (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Laminated Bodies (AREA)

Claims (8)

  1. Racle pour racler de l'encre d'impression excédentaire de la surface d'une forme d'impression (10), quelle section avant (3), concourant avec la surface de la forme (10), est munie sur toute la longueur de la racle, au moins sur un côté (3a, 3b), d'un revêtement (5) composé de lubrifiant ou contentant des particules lubrifiantes (8), caractérisée en ce que, pour abaisser l'usure de la racle, le revêtement (5) présente supplémentaire des particules (9) d'un matériau résistant à l'usure.
  2. Racle suivant la revendication 1, caractérisée en ce que le revêtement (5) comporte un support (7), dans lequel sont enrobées des particules lubrifiantes (8) et des particules (9) d'un matériau résistant à l'usure.
  3. Racle suivant l'une des revendications 1 et 2, caractérisée en ce que la section avant (3) est plus mince qu'une partie de racle arrière (2), prévue pour le montage dans une fixation.
  4. Racle suivant la revendications 3, caractérisée en ce que la partie de racle arrière (2) et une lamelle (3), formant la section avant, sont réalisées d'une seule pièce.
  5. Racle suivant la revendication 4, caractérisée en ce qu'une partie intermédiaire, qui est plus épaisse que la lamelle (3) et plus mince que la partie de racle arrière (2), est disposée entre la lamelle (3) et la partie de racle arrière (2).
  6. Racle suivant la revendication 3, caractérisée en ce que la partie de racle arrière (2) se compose de deux ou de plusieurs parties superposées et assemblées entre elles.
  7. Racle suivant l'une des revendications 4 et 5, caractérisée en ce que le revêtement (5) s'étend en dehors de la lamelle dans la zone limitrophe à cette dernière de la racle.
  8. Racle suivant l'une des revendications 1 à 7 caractérisée en ce que le revêtement (5) n'est appliqué que sur un côté (3b) de la section avant (3), qui est tourné vers le sens de rotation (D) de la forme d'impression (10).
EP97118522A 1997-10-24 1997-10-24 Racle pour l'enlèvement de l'encre superflue de la surface d'une plaque Expired - Lifetime EP0911157B1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
ES97118522T ES2171808T3 (es) 1997-10-24 1997-10-24 Rascador para eliminar el exceso de tinta de imprenta de la superficie de una placa de imprenta.
DE59706505T DE59706505D1 (de) 1997-10-24 1997-10-24 Rakel zum Abrakeln überflüssiger Druckfarbe von der Oberfläche einer Druckform
EP97118522A EP0911157B1 (fr) 1997-10-24 1997-10-24 Racle pour l'enlèvement de l'encre superflue de la surface d'une plaque
JP11522879A JP2000516171A (ja) 1997-10-24 1998-10-21 刷版の表面から余剰の印刷インクを掻き取るためのドクターブレード
PCT/CH1998/000447 WO1999021716A1 (fr) 1997-10-24 1998-10-21 Raclette destinee a enlever l'excedent d'une couleur d'imprimerie de la surface d'un imprime
BR9806272-7A BR9806272A (pt) 1997-10-24 1998-10-21 Raspadpr para raspagem de tinta de impressão excedente da superfìcie de uma matriz para impressão
US09/331,751 US6305282B1 (en) 1997-10-24 1998-10-21 Doctor blade for wiping away excess printing ink from the surface of a printing form

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP97118522A EP0911157B1 (fr) 1997-10-24 1997-10-24 Racle pour l'enlèvement de l'encre superflue de la surface d'une plaque

Publications (2)

Publication Number Publication Date
EP0911157A1 EP0911157A1 (fr) 1999-04-28
EP0911157B1 true EP0911157B1 (fr) 2002-02-27

Family

ID=8227519

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97118522A Expired - Lifetime EP0911157B1 (fr) 1997-10-24 1997-10-24 Racle pour l'enlèvement de l'encre superflue de la surface d'une plaque

Country Status (7)

Country Link
US (1) US6305282B1 (fr)
EP (1) EP0911157B1 (fr)
JP (1) JP2000516171A (fr)
BR (1) BR9806272A (fr)
DE (1) DE59706505D1 (fr)
ES (1) ES2171808T3 (fr)
WO (1) WO1999021716A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101195293B (zh) * 2006-12-04 2011-04-20 C.B.G.阿恰伊有限公司 具有弧形轮廓薄片的预搪磨刮刀和制造所述刮刀的方法
EP3178654A1 (fr) 2015-12-10 2017-06-14 Daetwyler Swisstec Ag Racleur
WO2022008232A1 (fr) 2020-07-10 2022-01-13 Daetwyler Swisstec Ag Racle traitée au laser

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10028476A1 (de) * 2000-06-08 2001-12-13 Roland Man Druckmasch Rakelvorrichtung
EP1197584A1 (fr) * 2000-10-10 2002-04-17 BTG Eclépens S.A. Lame de couchage et procédé de fabrication d'une lame de couchage
US20020098376A1 (en) * 2000-10-20 2002-07-25 Morris Harry C. Friction guard blade and a method of production thereof
SE519466C2 (sv) * 2000-12-07 2003-03-04 Swedev Ab Schaber - eller rakelblad med beläggning av nickel innefattandes nötningsbeständiga partiklar och metod vid dess framställning
SE0100505L (sv) * 2001-02-16 2002-07-23 Btg Eclepens Sa Självjusterande blad
US20060213342A1 (en) * 2005-03-22 2006-09-28 Fisher-Barton Llc Wear resistant cutting blade
BRPI0621982A2 (pt) * 2006-08-29 2011-12-20 Daetwyler Swisstec Ag lámina de raspar
US9132687B2 (en) * 2010-01-20 2015-09-15 Daetwyler Swisstec Ag Doctor blade
US8971761B2 (en) * 2011-07-11 2015-03-03 Canon Kabushiki Kaisha Image forming apparatus
WO2013019158A1 (fr) * 2011-08-04 2013-02-07 Allan Lunnerfjord Racle
WO2016042677A1 (fr) * 2014-09-19 2016-03-24 千葉機械工業株式会社 Dispositif à lame, et imprimante et appareil de revêtement comprenant ledit dispositif à lame
EP3308961A1 (fr) 2016-10-13 2018-04-18 Daetwyler Swisstec Ag Lames avec revêtement appliqué par projection thermique
JP7281342B2 (ja) * 2019-05-30 2023-05-25 理想科学工業株式会社 ワイパ機構
CN113415066B (zh) * 2021-06-04 2021-12-17 温州市南方立邦印刷实业有限公司 一种绿色环保印刷装置及印刷工艺

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US2359770A (en) * 1942-05-27 1944-10-10 Crowell Collier Publishing Com Apparatus for removing excess fluid from the printing cylinders of printing presses
US2313830A (en) * 1942-06-02 1943-03-16 Crowell Collier Publishing Com Doctor blade
US4184429A (en) 1972-02-09 1980-01-22 Max Datwyler & Co. Constant bevel doctor blade and method and apparatus using same
DE2817964C2 (de) * 1978-04-24 1980-08-07 Daetwyler & Co M Verfahren und Einrichtung zur Herabsetzung des Rakelverschleisses und der Abnützung der Oberfläche der Tiefdruckform
US4162652A (en) * 1978-05-25 1979-07-31 Roland Offsetmaschinenfabrik Faber & Schleicher Ag Device for cleaning cylinder bearers on printing presses
DE3338323A1 (de) * 1982-11-23 1984-05-24 Jagenberg AG, 4000 Düsseldorf Vorrichtung zum beschichten laufender materialbahnen
SE447362B (sv) * 1985-06-14 1986-11-10 Kanthal Dev Ab Schaberklinga
FR2678481B1 (fr) 1991-07-05 1994-09-02 Serge Barbieux Produit repulsif a l'egard des animaux, son procede de fabrication et son utilisation.
US5143745A (en) * 1991-08-16 1992-09-01 Maganas Thomas C Intermittent film deposition method and system
US5681387A (en) * 1993-04-30 1997-10-28 Jabil Circuit Company Segmented squeegee blade
NL9300810A (nl) * 1993-05-12 1994-12-01 Johannes Joseph Gerardus Linss Systeem voor het verdelen van een medium over een van putjes voorzien oppervlak.
DE4330545C2 (de) * 1993-09-09 1996-02-01 Voith Gmbh J M Rakelvorrichtung
US5638751A (en) 1994-10-26 1997-06-17 Max Daetwyler Corporation Integrated doctor blade and back-up blade
DE19652882A1 (de) * 1996-12-18 1998-06-25 Voith Sulzer Papiermasch Gmbh Auftragwerk zum direkten oder indirekten Auftragen eines flüssigen oder pastösen Auftragmediums auf eine laufende Materialbahn, insbesondere aus Papier oder Karton
SE511082C2 (sv) * 1996-12-20 1999-08-02 Btg Eclepens Sa Beläggningsblad
US5782976A (en) * 1997-06-27 1998-07-21 Westvaco Corporation Continuous coater blade

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101195293B (zh) * 2006-12-04 2011-04-20 C.B.G.阿恰伊有限公司 具有弧形轮廓薄片的预搪磨刮刀和制造所述刮刀的方法
EP3178654A1 (fr) 2015-12-10 2017-06-14 Daetwyler Swisstec Ag Racleur
WO2022008232A1 (fr) 2020-07-10 2022-01-13 Daetwyler Swisstec Ag Racle traitée au laser

Also Published As

Publication number Publication date
JP2000516171A (ja) 2000-12-05
WO1999021716A1 (fr) 1999-05-06
US6305282B1 (en) 2001-10-23
EP0911157A1 (fr) 1999-04-28
ES2171808T3 (es) 2002-09-16
BR9806272A (pt) 2000-04-04
DE59706505D1 (de) 2002-04-04

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