EP0262137B1 - Racle resistante a l'usure - Google Patents

Racle resistante a l'usure Download PDF

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Publication number
EP0262137B1
EP0262137B1 EP86903685A EP86903685A EP0262137B1 EP 0262137 B1 EP0262137 B1 EP 0262137B1 EP 86903685 A EP86903685 A EP 86903685A EP 86903685 A EP86903685 A EP 86903685A EP 0262137 B1 EP0262137 B1 EP 0262137B1
Authority
EP
European Patent Office
Prior art keywords
coating
molybdenum
fact
doctor blade
article
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
EP86903685A
Other languages
German (de)
English (en)
Other versions
EP0262137A1 (fr
Inventor
Martti Hakulinen
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.)
Voestalpine Precision Strip AB
Original Assignee
Voestalpine Precision Strip AB
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 Voestalpine Precision Strip AB filed Critical Voestalpine Precision Strip AB
Priority to AT86903685T priority Critical patent/ATE52731T1/de
Publication of EP0262137A1 publication Critical patent/EP0262137A1/fr
Application granted granted Critical
Publication of EP0262137B1 publication Critical patent/EP0262137B1/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
    • 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 cold rolled, heat-treated and hardened steel strip articles. More precisely the invention aims to improve the wear resistance and friction properties of such cold rolled steel strip articles which are exposed to abrasion.
  • the invention concerns coated scraper or doctor blades, for example for smoothing out a coating material on a continuous paper web or the scraping clean of rollers for creping, removal or scraping clean of surplus paint on rotogravure rollers, anilox rollers and similar machine parts.
  • the wearing out time for cold rolled steel strip coating scrapers is normally about 4 hours if the scraper is not coated with some wear or friction reducing coating. When the scraper is worn, the coating becomes faulty, and therefore the paper line must be stopped for replacement. For self-evident reasons it is desirable to increase the life of the scrapers, not in the first place in order to reduce the cost of the scrapers but in order to reduce the down times of the paper machine.
  • the object of the invention is to offer an improved solution to the above problems.
  • One aim is thus to improve the wear resistance and friction properties of a scraper or doctor blade in the shape of a chamfered, coated steel strip for smoothing out a coating material on a continuous paper web or for scraping rollers clean, i.e. a product which in its employment is exposed to wear which can put at risk the function of the product and/or reduce its active life. It is also an aim to reduce the energy requirement with the use of the product.
  • the coating consists of molybdenum or a molybdenum alloy consisting mainly of molybdenum and covering at least a part of the scraper or doctor blade's surface.
  • the layer thickness of the coating can vary but generally amounts to between 0.02 and 0.5 mm, which can correspond to between 10 and 100% of the thickness of the steel strip.
  • the coating is limited essentially only to that part of the blade or corresponding element which is exposed to wear during work, preferably the face area or face areas and/or the area up to the leading edge of the face area or face areas, in a way which in itself is conventional.
  • a doctor blade in general is marked with the numeral 7.
  • the blade's dimensions are considerably increased in the drawing. It consists of a thin cold rolled strip 8 with a face area 9.
  • the face area 9 is coated with a wearing layer 10.
  • the wearing layer also covers with a part 11 the area up to the leading edge 12 of the face area 9.
  • the material in the doctor blades 8 consisted of a carbon steel (quality UHB 6 20C) with hardness about 530 HV.
  • the scraper blades had the following dimensions: thickness 0.38 mm, width 45 mm, length 225 mm.
  • the scraper blades 8 were clad with the wearing layers 10 and 11 of varying composition. After coating, the coating surfaces were ground to the thicknesses which can be seen in Table 1.
  • the table also contains information about the composition of the coating layer and the wearing down expressed as weight loss after 30 min.
  • the improved wear resistance can be utilised to prolong the effective life of paper machine scrapers, so that the interval between scraper replacements can be very considerably extended.
  • the lower friction results in a reduced output requirement significantly so as to decrease the investment and operating costs.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Coating Apparatus (AREA)
  • Road Paving Machines (AREA)
  • Printing Plates And Materials Therefor (AREA)

Abstract

Racle ou grattoir (7) ayant la forme d'une bande d'acier enduite biseautée (8) destinée à lisser un matériau d'enduction sur une bande de papier continue ou à nettoyer par raclage des cylindres. Selon la présente invention, au moins une partie (9) de sa surface comprend une enduction couvrante (10, 11) de molybdène ou d'alliages de molybdène consistant essentiellement en molybdène.

Claims (6)

1. Racleur ou lame de raclage (7) sous la forme d'une bande d'acier revêtue, chanfreinée (8) pour lisser un matériau de revêtement sur une bande de papier continue ou pour nettoyer des rouleaux par raclage, caractérisé par le fait qu'au moins une partie (9) de sa surface possède un revêtement (10, 11) de molybdène ou d'un alliage de molybdène consistant principalement en molybdène.
2. Objet selon la revendication 1, caractérisé par le fait que le revêtement possède une épaisseur de 0,02-0,5 mm.
3. Objet selon la revendication 2, caractérisé par le fait que le revêtement possède une épaisseur comprise entre 10 et 100% de l'épaisseur du racleur ou de la lame de raclage.
4. Objet selon l'une quelconque des revendications 1 à 3, caractérisé par le fait que ledit revêtement de molybdène ou d'alliage de molybdène est appliqué directement à l'acier sans couche de liaison.
5. Objet selon l'une quelconque des revendications 1 à 4, caractérisé par le fait que le revêtement est essentiellement limité à cette partie (9) de la lame (8) qui est exposée durant le travail à une usure, de préférence là où les facettes et/ou la surface jusqu'au bord antérieur de la ou des facettes (12).
6. Objet selon l'une quelconque des revendications 1 à 5, caractérisé par le fait que son épaisseur est de 0,05-3,5 mm.
EP86903685A 1985-06-14 1986-06-06 Racle resistante a l'usure Expired - Lifetime EP0262137B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86903685T ATE52731T1 (de) 1985-06-14 1986-06-06 Verschleissfester rakel.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8502954A SE447362B (sv) 1985-06-14 1985-06-14 Schaberklinga
SE8502954 1985-06-14

Publications (2)

Publication Number Publication Date
EP0262137A1 EP0262137A1 (fr) 1988-04-06
EP0262137B1 true EP0262137B1 (fr) 1990-05-16

Family

ID=20360573

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86903685A Expired - Lifetime EP0262137B1 (fr) 1985-06-14 1986-06-06 Racle resistante a l'usure

Country Status (9)

Country Link
EP (1) EP0262137B1 (fr)
JP (1) JPS62503085A (fr)
KR (1) KR870700515A (fr)
AU (1) AU5966386A (fr)
BR (1) BR8607112A (fr)
DE (1) DE3671193D1 (fr)
FI (1) FI875167A0 (fr)
SE (1) SE447362B (fr)
WO (1) WO1986007309A1 (fr)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE59502332D1 (de) * 1995-02-27 1998-07-02 Rolf Meyer Rakel für Tiefdruck-Rotationsmaschinen sowie Verfahren und Vorrichtung zu deren Herstellung
DE19509741A1 (de) * 1995-03-17 1996-09-19 Roland Man Druckmasch Druckmaschinenwalze, insbesondere Farbwalze
FR2733720B1 (fr) * 1995-05-05 1997-07-25 Heidelberg Harris Sa Lame de machine rotative a imprimer offset
FR2740386B1 (fr) * 1995-10-26 1998-01-16 Heidelberg Harris Sa Lame d'encrier subdivisee en zones pour une machine rotative a imprimer
SE506563C2 (sv) 1996-05-02 1998-01-12 Btg Eclepens Sa Kräppningsblad
US5753076A (en) * 1997-02-03 1998-05-19 Kimberly-Clark Worldwide, Inc. Method for creping tissue
EP0911157B1 (fr) * 1997-10-24 2002-02-27 MDC Max Dätwyler Bleienbach AG Racle pour l'enlèvement de l'encre superflue de la surface d'une plaque
FI111343B (fi) 1998-06-09 2003-07-15 Metso Paper Inc Kaavinterä ja terän pidin
SE0000215L (sv) * 2000-01-25 2001-07-26 Btg Eclepens Sa Rakelknive
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
US6546861B2 (en) 2001-07-30 2003-04-15 Goss Graphic Systems, Inc. Printing press scraping blade
KR20030033562A (ko) * 2001-10-24 2003-05-01 김창준 닥터블레이드
DE10222453A1 (de) * 2002-05-22 2003-12-04 Voith Paper Patent Gmbh Verfahren zur Oberflächenbehandlung eines Rakelelementes

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ZA703701B (en) * 1969-06-16 1971-01-27 Norton Co Doctor blade
US3688336A (en) * 1970-07-16 1972-09-05 Lodding Engineering Corp Extended-life doctoring apparatus
US3703019A (en) * 1970-10-15 1972-11-21 Norton Co Surface conforming wear resistant doctor blade for rolls
SU850750A1 (ru) * 1979-07-24 1981-07-30 Ленинградский Технологическийинститут Целлюлозно-Бумажнойпромышленности Электролит дл осаждени МОлибдЕНОВыХ пОКРыТий
DE3110842A1 (de) * 1981-03-20 1982-09-30 Basf Ag, 6700 Ludwigshafen Rakel fuer den tiefdruck mit kunststoff-druckschichten
SE437683B (sv) * 1982-10-13 1985-03-11 Inventing Ab Schaber eller rakel - anliggande mot valsen - vid exv tryck-, ferg-, eller kreppning
SE437681B (sv) * 1982-10-13 1985-03-11 Inventing Ab Schaber eller rakel for kontrollerbar paforing och utjemning av bestrykningsmedel pa en lopande pappersbana

Also Published As

Publication number Publication date
FI875167A (fi) 1987-11-23
WO1986007309A1 (fr) 1986-12-18
DE3671193D1 (de) 1990-06-21
BR8607112A (pt) 1988-02-23
SE447362B (sv) 1986-11-10
EP0262137A1 (fr) 1988-04-06
KR870700515A (ko) 1987-12-29
AU5966386A (en) 1987-01-07
FI875167A0 (fi) 1987-11-23
SE8502954D0 (sv) 1985-06-14
JPS62503085A (ja) 1987-12-10

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