WO2003097890A2 - Method for surface treatment of a doctor blade element - Google Patents

Method for surface treatment of a doctor blade element Download PDF

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Publication number
WO2003097890A2
WO2003097890A2 PCT/EP2003/050161 EP0350161W WO03097890A2 WO 2003097890 A2 WO2003097890 A2 WO 2003097890A2 EP 0350161 W EP0350161 W EP 0350161W WO 03097890 A2 WO03097890 A2 WO 03097890A2
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WO
WIPO (PCT)
Prior art keywords
doctor
treatment
doctor element
application
steel
Prior art date
Application number
PCT/EP2003/050161
Other languages
German (de)
French (fr)
Other versions
WO2003097890A3 (en
Inventor
Ulrich Schoof
Stefan Reimann
Original Assignee
Voith Paper Patent Gmbh
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 Voith Paper Patent Gmbh filed Critical Voith Paper Patent Gmbh
Priority to EP03730210A priority Critical patent/EP1509632A2/en
Priority to AU2003240846A priority patent/AU2003240846A1/en
Publication of WO2003097890A2 publication Critical patent/WO2003097890A2/en
Publication of WO2003097890A3 publication Critical patent/WO2003097890A3/en
Priority to US10/992,348 priority patent/US20050100673A1/en

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05CAPPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B05C11/04Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with blades
    • B05C11/045Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with blades characterised by the blades themselves
    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C12/00Solid state diffusion of at least one non-metal element other than silicon and at least one metal element or silicon into metallic material surfaces
    • C23C12/02Diffusion in one step
    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/22Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
    • C23C14/48Ion implantation
    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/36Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases using ionised gases, e.g. ionitriding
    • C23C8/38Treatment of ferrous surfaces
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H25/00After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/08Rearranging applied substances, e.g. metering, smoothing; Removing excess material
    • D21H25/10Rearranging applied substances, e.g. metering, smoothing; Removing excess material with blades

Definitions

  • the invention relates to a method for surface treatment of a doctor element, which consists of a steel alloy, in particular austenitic steel.
  • Squeegee elements of this type are used in application and metering systems for devices for coating fibrous webs, in particular webs made of paper or cardboard.
  • the squeegee elements which are used in the form of squeegee bars, squeegee strips or as squeegee blades, serve to scrape off the liquid or pasty medium, in particular pigment coating ink, applied to the desired coating weight in excess on a transfer element or directly onto the material web, or only to make it more uniform.
  • doctor elements today have lengths of 10 m and more, in accordance with the increasingly widespread machines.
  • doctor blades, doctor blades or doctor blades either have a smooth surface (EP 0654643B1) or a grooved profiled surface (DE 3022955).
  • doctor elements are particularly subject to wear, particularly when coating abrasive pigment coating colors and due to the high running speed of the web, these elements are currently manufactured from a base body made of steel and provided with a hard material layer. It is known to produce this hard material layer from chrome (EP 0454643B1) or ceramic (DE 3937749A1).
  • a reaction of the hard material (chrome or ceramic) with ions applied in a plasma is intended to increase the hardness of the doctor rods, but above all to close cracks in the surface.
  • the invention is therefore based on the object of providing doctor elements which have a long service life and, moreover, can be produced economically and in an environmentally friendly manner.
  • the doctor elements After the treatment, the doctor elements have a surface hardness of 900 to 1800 HV, preferably 1000 to 1200 HV.
  • doctor element treated in this way lie in the improved technological properties and in its increased service life.
  • Figure 1 shows: A cylindrical doctor rod as a doctor element.
  • Figure 2 shows: A doctor bar as a doctor element.
  • the cylindrical doctor rod 1 shown in Figure 1 is made of austenitic steel. Its diameter depends on the type of application medium, the type of material to be coated (fine paper, special paper, raw cardboard, etc.) and the thickness of the application (coat weight in grams per square meter). The diameter is generally 8 mm to 80 mm. All diameters have proven suitable for treatment with the ion implantation method.
  • the lateral surface 1a is smooth or also provided with circumferential grooves which are introduced in the manner of a helix.
  • the grooves mentioned, which are also shown in the figure, are used for volumetric metering of the application medium.
  • the dosage corresponds to the free cross-section of the grooves.
  • the squeegee strip shown in FIG. 2 is made of austenitic steel and can have a surface as described in FIG. 1. In the example, this surface is smooth and designated 1 a '.
  • the doctor bar 2 has a sharp tear-off edge for an exact doctoring of the medium. The tear-off edge is designated 2a.
  • the squeegee strip 2 shown in FIG. 2 and set against the material web B can have a flat, convex or concave surface 1a. In the example, this is convex.
  • the squeegee strip 2 is arranged on a support body 3, which is only indicated, and is resiliently supported against the latter. This is supported with a pressure hose 4.
  • Both doctor elements 1 and 2 shown are treated or refined with an ion implantation method.
  • the gas plasma consists of nitrogen and carbon compounds and at least one noble gas such as argon or helium.
  • titanium serves as foreign ions, but also molybdenum, tungsten, vanadium, chromium and boron ions.
  • a selection of ion types that is matched to the respective substrate and the intended use is used.
  • the ions are injected to a depth of up to 0.15 mm, preferably 0.02 to 0.05 mm.
  • the treatment or refinement process is carried out at temperatures of preferably 50-650 ° C. and 70 ° and 400 ° C. and a residence time in the gas plasma phase of up to 60 hours.
  • the doctor elements treated in this way then have a surface hardness of 900 to 1800 HV, preferably 1000 to 1200 HV.
  • the surface of the doctor elements 1 and 2 is therefore very fine crystalline and can therefore apply the coating material more uniformly than previously to a paper or cardboard web.
  • the service life of the doctor elements is at least as good as doctor elements from the prior art, which additionally have a hard material layer on the steel body.
  • the doctor element 1 or 2 refined by the method according to the invention is preferably used in a coating device for direct or indirect application on one or both sides.
  • the application medium is either applied to the transfer element, for example an application roller, from which the paper web as the medium in a press nip is removed, or the medium is applied directly to the web. Subsequently, with the metering system, which contains the doctor element, the medium previously applied in excess is scraped to a desired level or the applied layer is only leveled out.
  • the application medium in particular pigment-containing medium, for painting or pigmenting the material web, in particular made of paper or cardboard, can take a long time (with LDTA, ie Long Dwell Time Applicator) or only a short time (with SDTA, ie Short Dwel.) have acted on the material web.
  • LDTA Long Dwell Time Applicator
  • SDTA ie Short Dwel.
  • Nozzle application process e.g. JetFlow, SpeedFlow etc.
  • the method according to the invention can be used both in the new production of the doctor elements and for the aftertreatment of the doctor elements.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Paper (AREA)
  • Rotary Presses (AREA)

Abstract

The invention relates to a method for surface treatment of a doctor blade element made of a steel alloy, especially austenitic steel, for coating devices. According to the invention, the doctor blade element is subjected to a gas-plasma assisted treatment wherein the gas plasma contains nitrogen and carbon compounds and at least one noble gas, preferably argon. During the treatment, foreign metal foreign ions, especially titanium and molybdenum, are implanted directly in the steel surface of the doctor blade element.

Description

Verfahren zur Oberflächenbehandlung eines Rakelelementes Process for the surface treatment of a doctor element
Die Erfindung betrifft ein Verfahren zur Oberflächenbehandlung eines Rakelelementes, welches aus einer Stahllegierung, insbesondere austenitischem Stahl besteht.The invention relates to a method for surface treatment of a doctor element, which consists of a steel alloy, in particular austenitic steel.
Derartige Rakelelemente werden in Auftrags- und Dosiersystemen von Vorrichtungen zur Beschichtung von Faserstoffbahnen, insbesondere Bahnen aus Papier oder Ka rto n e i n g esetzt.Squeegee elements of this type are used in application and metering systems for devices for coating fibrous webs, in particular webs made of paper or cardboard.
Diese Vorrichtungen sind Bestandteil von Online- oder Offline-Streichmaschinen zur Herstellung der Faserstoffbahn.These devices are part of online or offline coating machines for the production of the fibrous web.
Die Rakelelemente, welche in Form von Rakelstäben, Rakelleisten oder auch als Rakelklingen eingesetzt werden, dienen dazu das im Überschuss auf ein Übertragungselement oder direkt auf die Materialbahn aufgebrachte flüssige oder pastöse Medium, insbesondere Pigmentstreichfarbe auf das gewünschte Strichgewicht abzurakeln oder es nur zu Vergleichmäßigen.The squeegee elements, which are used in the form of squeegee bars, squeegee strips or as squeegee blades, serve to scrape off the liquid or pasty medium, in particular pigment coating ink, applied to the desired coating weight in excess on a transfer element or directly onto the material web, or only to make it more uniform.
Die Rakelelemente weisen heute entsprechend der immer breiter geforderten Maschinen Längen von 10 m und mehr auf.The doctor elements today have lengths of 10 m and more, in accordance with the increasingly widespread machines.
Die Rakelstäbe, Rakelleisten oder Rakelklingen besitzen entweder eine glatte Oberfläche (EP 0654643B1) oder eine gerillte profilierte Oberfläche (DE 3022955).The doctor blades, doctor blades or doctor blades either have a smooth surface (EP 0654643B1) or a grooved profiled surface (DE 3022955).
Da die Rakelelemente insbesondere beim Beschichten von abrasiv wirkenden Pigmentstreichfarben und durch die hohe Laufgeschwindigkeit der Bahn besonders stark auf Verschleiß beansprucht werden, werden gegenwärtig diese Elemente aus einem Grund körper aus Stahl gefertigt und mit einer Hartstoffschicht versehen. Es ist bekannt, diese Hartstoffschicht aus Chrom (EP 0454643B1) oder Keramik (DE 3937749A1) zu fertigen.Since the doctor elements are particularly subject to wear, particularly when coating abrasive pigment coating colors and due to the high running speed of the web, these elements are currently manufactured from a base body made of steel and provided with a hard material layer. It is known to produce this hard material layer from chrome (EP 0454643B1) or ceramic (DE 3937749A1).
Die Herstellung einer solchen Schicht ist sowohl teuer, als auch sehr zeitaufwendig.The production of such a layer is both expensive and very time-consuming.
Außerdem ist die Standzeit solcher Art „gefestigter Rakelelemente" immer noch zu gering. Deshalb wurde in der DE 19840951 A1 vorgeschlagen, Rakelstangen die eine genannte Hartstoffschicht aufweisen, einem lonen-lmplatationsverfahren zu unterziehen.In addition, the service life of such a type of “fixed doctor blade elements” is still too short. For this reason, DE 19840951 A1 proposed to subject doctor blade rods which have a hard material layer mentioned to an ion implantation process.
Durch eine Reaktion des Hartstoffes (des Chromes oder der Keramik) mit in einem Plasma applizierten Ionen, soll die Härte der Rakelstangen erhöht, vor allem aber Risse in der Oberfläche verschlossen werden.A reaction of the hard material (chrome or ceramic) with ions applied in a plasma is intended to increase the hardness of the doctor rods, but above all to close cracks in the surface.
Aber auch dieses Veredelungsverfahren ist kostenintensiv.But this finishing process is also cost-intensive.
Des weiteren können produktionstypische Fehler, wie Verchromungsfehler oder Ungleichmäßigkeiten - hauptsächlich bei Keramikbeschichtungen auftreten, wodurch die Rakelstange ihrem eigentlichen Ziel - nämlich die Schaffung einer gleichmäßigen Auftragsschicht über die gesamte Breite und Länge der Faserstoffbahn - nicht mehr gerecht werden kann.Furthermore, errors typical of production, such as chrome plating errors or irregularities, can occur mainly with ceramic coatings, as a result of which the doctor rod can no longer meet its actual aim - namely to create a uniform application layer over the entire width and length of the fibrous web.
Der Erfindung liegt daher die Aufgabe zugrunde, Rakelelemente bereit zu stellen, die eine hohe Standzeit aufweisen und darüber hinaus kostengünstig und umweltschonend herstellbar sind.The invention is therefore based on the object of providing doctor elements which have a long service life and, moreover, can be produced economically and in an environmentally friendly manner.
Die Aufgabe wird mit einem Verfahren gemäß der Merkmale des Anspruches 1 , einem Rakelelement gemäß dem Anspruch 9 sowie einer Vorrichtung gemäß Anspruch 11 gelöst.The object is achieved with a method according to the features of claim 1, a doctor element according to claim 9 and a device according to claim 11.
Völlig überraschend hat sich gezeigt, dass ein an sich bekanntes lonen- Implantationsverfahren im Plasma auch bei austenitischen Stellen anwendbar ist und zu einer Vergrößerung der Oberflächenhärte (gemessen nach Vikers) führt.Completely surprisingly, it has been shown that a known ion implantation method in plasma can also be used in austenitic areas leads to an increase in surface hardness (measured according to Vikers).
Die Rakelelemente zeigen nach der Behandlung eine Oberflächenhärte von 900 bis 1800 HV, vorzugsweise 1000 bis 1200 HV.After the treatment, the doctor elements have a surface hardness of 900 to 1800 HV, preferably 1000 to 1200 HV.
Das ist umso bedeutender, da man wegen der Versprödungsgefahr in Folge der Bildung von Chromkarbid und der interkristallinen -Korrosion chromhaltige austenitische Stähle für nicht oder nur schlecht härtbar hielt. Da eine Härtung immer mit einer Verschlechterung der Korrosionsfertigkeit einher ging. Diese Nachteile werden mit der vorliegenden vermieden.This is all the more important since, because of the risk of embrittlement as a result of the formation of chromium carbide and the intergranular corrosion, chromium-containing austenitic steels were thought to be non-hardenable or only poorly hardenable. Since hardening was always accompanied by a deterioration in the ability to corrosion. These disadvantages are avoided with the present.
Dadurch, dass man die Einlagerung der Fremdionen transkristallin, d.h. im Metallgitter, erfolgen lässt, können diese vorstehend genannten unerwünschten Effekte vermieden werden und ermöglichen erstmals das erfindungsgemäße Veredelungsverfahren.By making the incorporation of the foreign ions transcrystalline, i.e. in the metal grid, these undesirable effects mentioned above can be avoided and enable the refinement process according to the invention for the first time.
Die Hauptvorteile eines derartig behandelten Rakelelementes liegen in den verbesserten technologischen Eigenschaften sowie in dessen erhöhter Standzeit.The main advantages of a doctor element treated in this way lie in the improved technological properties and in its increased service life.
Weitere zweckmäßige Ausgestaltungsmöglichkeiten sind in den Unteransprüchen enthalten.Further expedient design options are contained in the subclaims.
Nachfolgend sollen Anwendungsbeispiele anhand der Zeichnung beschrieben werden.In the following, application examples will be described using the drawing.
Figur 1 zeigt: Einen zylindrischen Rakelstab als Rakelelement.Figure 1 shows: A cylindrical doctor rod as a doctor element.
Figur 2 zeigt: Eine Rakelleiste als Rakelelement.Figure 2 shows: A doctor bar as a doctor element.
Der in Figur 1 dargestellte zylindrische Rakelstab 1 besteht aus austenitischem Stahl. Sein Durchmesser ist abhängig von der Art des Auftragsmediums, von der Art des zu beschichtenden Materials (Feinpapier, Spezialpapier, Rohkarton usw.) und von der Auftragsdicke (Strichgewicht in Gramm pro Quadratmetern). Der Durchmesser beträgt im allgemeinen 8 mm bis 80 mm. Für eine Behandlung mit dem lonen- Implantationsverfahren haben sich alle Durchmesser als geeignet erwiesen.The cylindrical doctor rod 1 shown in Figure 1 is made of austenitic steel. Its diameter depends on the type of application medium, the type of material to be coated (fine paper, special paper, raw cardboard, etc.) and the thickness of the application (coat weight in grams per square meter). The diameter is generally 8 mm to 80 mm. All diameters have proven suitable for treatment with the ion implantation method.
Je nach Anwendungsfall ist die Mantelfläche 1a glatt ausgebildet oder auch mit Umfangsrillen, die schraubenlinienartig eingebracht sind, versehen. Die genannten Rillen, die in der Figur auch gezeigt sind, dienen der volumetrischen Dosierung des Auftragsmediums. Die Dosiermenge entspricht dabei dem freien Querschnitt der Rillen.Depending on the application, the lateral surface 1a is smooth or also provided with circumferential grooves which are introduced in the manner of a helix. The grooves mentioned, which are also shown in the figure, are used for volumetric metering of the application medium. The dosage corresponds to the free cross-section of the grooves.
Auch die in der Figur 2 dargestellte Rakelleiste besteht wie der Rakelstab 1 , aus austenitischem Stahl und kann eine, wie in Figur 1 beschriebene Oberfläche aufweisen. Im Beispiel ist diese Fläche glatt ausgebildet und mit 1 a' bezeichnet. Darüber hinaus weist die Rakelleiste 2 eine scharfe Abrisskante für ein genaues Abrakeln des Mediums auf. Die Abrisskante ist mit 2a bezeichnet.The squeegee strip shown in FIG. 2, like the squeegee rod 1, is made of austenitic steel and can have a surface as described in FIG. 1. In the example, this surface is smooth and designated 1 a '. In addition, the doctor bar 2 has a sharp tear-off edge for an exact doctoring of the medium. The tear-off edge is designated 2a.
Die in Figur 2 dargestellte und gegen die Materialbahn B angestellte Rakelleiste 2 kann eine ebene, konvexe oder konkav geformte Oberfläche 1a aufweisen. Im Bespiel ist diese konvex geformt. Die Rakelleiste 2 ist an einem nur angedeuteten Tragkörper 3 angeordnet und gegen diesen nachgiebig gestützt. Die Abstützung erfolgt hierbei mit einem Druckschlauch 4.The squeegee strip 2 shown in FIG. 2 and set against the material web B can have a flat, convex or concave surface 1a. In the example, this is convex. The squeegee strip 2 is arranged on a support body 3, which is only indicated, and is resiliently supported against the latter. This is supported with a pressure hose 4.
Beide gezeigten Rakelelemente 1 und 2 werden mit einem lonen- Implantationsverfahren behandelt bzw. veredelt.Both doctor elements 1 and 2 shown are treated or refined with an ion implantation method.
Das geschieht derart, dass ihr austenitischer Stahlkörper direkt mit energiereichen Ionen im Gasplasmazustand beschossen wird.This happens in such a way that its austenitic steel body is bombarded directly with high-energy ions in the gas plasma state.
Das Gasplasma besteht aus Stickstoff- und Kohlenstoffverbindungen sowie mindestens einem Edelgas wie Argon oder Helium.The gas plasma consists of nitrogen and carbon compounds and at least one noble gas such as argon or helium.
Als Fremdionen dienen vor allem Titan, aber auch Molybdän, Wolfram, Vanadium, Chrom und Bor-Ionen. Dabei wird eine auf das jeweilige Substrat und den Verwendundungszweck abgestimmte Auswahl an lonenarten verwendet. Der Einschuss der Ionen erfolgt bis in eine Tiefe von bis zu 0,15 mm, vorzugsweise 0,02 bis 0,05 mm.Above all, titanium serves as foreign ions, but also molybdenum, tungsten, vanadium, chromium and boron ions. A selection of ion types that is matched to the respective substrate and the intended use is used. The ions are injected to a depth of up to 0.15 mm, preferably 0.02 to 0.05 mm.
Das Behandlungs- bzw. Veredelungsverfahren erfolgt bei Temperaturen von bevorzugt 50 - 650°C und 70° und 400 °C und einer Verweildauer in der Gas- Plasmaphase von bis zu 60 Stunden.The treatment or refinement process is carried out at temperatures of preferably 50-650 ° C. and 70 ° and 400 ° C. and a residence time in the gas plasma phase of up to 60 hours.
Die so behandelten Rakelelemente weisen danach eine Oberflächenhärte von 900 bis 1800 HV vorzugsweise 1000 bis 1200 HV auf.The doctor elements treated in this way then have a surface hardness of 900 to 1800 HV, preferably 1000 to 1200 HV.
Die Oberfläche der Rakelelemente 1 und 2 ist dadurch sehr feinkristallin und kann dadurch das Beschichtungsmaterial gleichmäßiger als bisher auf eine Papier- oder Kartonbahn auftragen.The surface of the doctor elements 1 and 2 is therefore very fine crystalline and can therefore apply the coating material more uniformly than previously to a paper or cardboard web.
Die Standzeit der Rakelelemente ist mindestens so gut, wie Rakelelemente aus dem Stand der Technik, die zusätzlich eine Hartstoffschicht auf dem Stahlkörper aufweisen.The service life of the doctor elements is at least as good as doctor elements from the prior art, which additionally have a hard material layer on the steel body.
Bevorzugt wird das nach dem erfindungsgemäßen Verfahren veredelte Rakelelement 1 oder 2, wie bereits erwähnt, in einer Beschichtungsvorrichtung zum ein- oder beidseitigen direkten oder indirekten Auftragen eingesetzt. Das Auftragsmedium wird entweder auf im Übertragungselement, beispielsweise eine Auftragswalze aufgebracht von welcher die Papierbahn als Medium in einem Pressnip abnimmt oder das Medium wird direkt auf die Bahn aufgetragen. Im Anschluss daran wird mit dem Dosier System, welches das Rakelelement enthält, das zuvor im Überschuss aufgetragene Medium auf ein gewünschtes Maß abgerakelt oder die aufgetragene Schicht wird nur vergleichmäßigt. Das Auftragsmedium, insbesondere pigmenthaltiges Medium, zum Streichen oder Pigmentieren der Materialbahn, insbesondere aus Papier oder Karton, kann vor dem Rakeln längere Zeit (bei LDTA, d. h. Long Dwell Time Applicator) als auch nur kurze Zeit (bei SDTA, d.h. Short Dwel .) auf die Materialbahn eingewirkt haben. Dabei sind als Auftragsverfahren sogenannte Walzenauftragsverfahren als auch Düsenauftragsverfahren (z. B. JetFlow, SpeedFlow usw.) möglich.As already mentioned, the doctor element 1 or 2 refined by the method according to the invention is preferably used in a coating device for direct or indirect application on one or both sides. The application medium is either applied to the transfer element, for example an application roller, from which the paper web as the medium in a press nip is removed, or the medium is applied directly to the web. Subsequently, with the metering system, which contains the doctor element, the medium previously applied in excess is scraped to a desired level or the applied layer is only leveled out. The application medium, in particular pigment-containing medium, for painting or pigmenting the material web, in particular made of paper or cardboard, can take a long time (with LDTA, ie Long Dwell Time Applicator) or only a short time (with SDTA, ie Short Dwel.) have acted on the material web. There are so-called roller application methods as well as application methods Nozzle application process (e.g. JetFlow, SpeedFlow etc.) possible.
Derartige Auftragsvorrichtungen sind hinreichend bekannt, weshalb auf eine zeichnerische Darstellung hier verzichtet werden soll.Such application devices are well known, which is why a graphic representation should be omitted here.
Es soll noch erwähnt werden, dass das erfindungsgemäße Verfahren sowohl bei der Neuproduktion der Rakelelemente als auch zur Nachbehandlung der Rakelelemente angewendet werden kann. It should also be mentioned that the method according to the invention can be used both in the new production of the doctor elements and for the aftertreatment of the doctor elements.

Claims

Patentansprüche claims
1. Verfahren zur Oberflächenbehandlung eines, aus einer Stahllegierung, insbesondere austenitischem Stahl bestehenden Rakelelementes für Beschichtungseinrichtungen, dadurch gekennzeichnet, dass das Rakelelement einer Gasplasma gestützten Behandlung unterworfen wird, wobei das Gasplasma Stickstoff- und Kohlenstoffverbindungen sowie mindestens ein Edelgas, vorzugsweise Argon enthält und während der Behandlung Fremdmetall-Fremdionen, insbesondere Titan und Molybdän direkt in die Stahloberfläche des Rakelelementes implantiert werden.1. A method for the surface treatment of a doctor element made of a steel alloy, in particular austenitic steel for coating devices, characterized in that the doctor element is subjected to a gas plasma-assisted treatment, the gas plasma containing nitrogen and carbon compounds and at least one noble gas, preferably argon, and during the Treatment Foreign metal foreign ions, in particular titanium and molybdenum, can be implanted directly into the steel surface of the doctor element.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass weitere Fremdionen aus Wolfram, Vanadium, Chrom und Bor verwendet werden.2. The method according to claim 1, characterized in that further foreign ions of tungsten, vanadium, chromium and boron are used.
3. Verfahren nach Anspruch 1 bis 2, dadurch gekennzeichnet, dass die Fremdionen bis zu 0,15 mm, vorzugsweise 0,02 bis 0,05 mm tief in die Oberfläche des Rakelelementes eingebracht werden.3. The method according to claim 1 to 2, characterized in that the foreign ions are introduced up to 0.15 mm, preferably 0.02 to 0.05 mm deep in the surface of the doctor element.
4. Verfahren nach Anspruch 1 bis 3, dadurch gekennzeichnet, dass die Fremdionen transkristallin eingebracht werden.4. The method according to claim 1 to 3, characterized in that the foreign ions are introduced transcrystalline.
5. Verfahren nach Anspruch 1 bis 4, dadurch gekennzeichnet, dass die Dauer der Behandlung bis zu 60 Stunden beträgt. o5. The method according to claim 1 to 4, characterized in that the duration of the treatment is up to 60 hours. O
6. Verfahren nach Anspruch 1 bis 5, dadurch gekennzeichnet, dass die Behandlung bei Temperaturen von bis zu 650 °C durchgeführt wird.6. The method according to claim 1 to 5, characterized in that the treatment is carried out at temperatures of up to 650 ° C.
7. Verfahren nach Anspruch 1 bis 6, dadurch gekennzeichnet, dass zumindest der zur Rakelung vorgesehene Arbeits-Bereich des Rakelelementes behandelt wird.7. The method according to claim 1 to 6, characterized in that at least the working area of the doctor element provided for doctoring is treated.
8. Rakelelement für eine Beschichtungsvorrichtung, welches aus einer8. Doctor element for a coating device, which consists of a
Stahllegierung, insbesondere austenitischem Stahl besteht, gekennzeichnet durch eine gemäß der Ansprüche 1 bis 8 behandelte Oberfläche, welche eine Härte von 900 bis 1800 HV, vorzugsweise 1000 bis 1200 HV aufweist.Steel alloy, in particular austenitic steel, characterized by a surface treated according to claims 1 to 8, which has a hardness of 900 to 1800 HV, preferably 1000 to 1200 HV.
9. Rakellement nach Anspruch 8, dadurch gekennzeichnet, dass es eine gerillte oder eine glatte Oberfläche aufweist.9. doctor element according to claim 8, characterized in that it has a grooved or a smooth surface.
10. Rakelelement nach Anspruch 8 und 9, dadurch gekennzeichnet, dass es als rotierbarer zylindrischer Rakelstab mit einem Durchmesser von 8 bis 80 mm, insbesondere Durchmesser von 8 bis 50 mm ausgebildet ist.10. Doctor element according to claim 8 and 9, characterized in that it is designed as a rotatable cylindrical doctor rod with a diameter of 8 to 80 mm, in particular diameter of 8 to 50 mm.
11. Rakelelement nach Anspruch 8 und 9, dadurch gekennzeichnet, dass es als feststehende Rakelleiste ausgebildet ist, wobei die behandelte Rakelfläche eine scharfe Abrisskante aufweist.11. Squeegee element according to claim 8 and 9, characterized in that it is designed as a fixed squeegee bar, the treated squeegee surface having a sharp tear-off edge.
12. Vorrichtung zum direkten oder indirekten Auftragen eines flüssigen oder pastösen Mediums auf eine laufende Oberfläche, wobei die laufende Oberfläche bei direktem Auftrag die Oberfläche einer Materialbahn, insbesondere aus Papier oder Karton ist und bei indirektem Auftrag die Oberfläche eines Übertragungselementes, beispielsweise eine Auftragswalze ist, welche das Medium an die Materialbahn abgibt, umfassend ein Auftrags- und Dosiersystem, das gegen die laufende Oberfläche anstellbar ist, dadurch gekennzeichnet, dass das Dosiersystem ein Rakelelement gemäß einer oder mehrere der Ansprüche 8 bis 11 enthält. 12.Device for the direct or indirect application of a liquid or pasty medium to a running surface, the running surface being the surface of a material web, in particular made of paper or cardboard in the case of direct application, and the surface of a transfer element, for example an application roller in the case of indirect application. which the Dispenses medium to the material web, comprising an application and metering system that can be set against the running surface, characterized in that the metering system contains a doctor element according to one or more of claims 8 to 11.
PCT/EP2003/050161 2002-05-22 2003-05-14 Method for surface treatment of a doctor blade element WO2003097890A2 (en)

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EP03730210A EP1509632A2 (en) 2002-05-22 2003-05-14 Method for surface treatment of a doctor blade element
AU2003240846A AU2003240846A1 (en) 2002-05-22 2003-05-14 Method for surface treatment of a doctor blade element
US10/992,348 US20050100673A1 (en) 2002-05-22 2004-11-19 Method for the surface treatment of a doctor element

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DE2002122453 DE10222453A1 (en) 2002-05-22 2002-05-22 Process for the surface treatment of a doctor element
DE10222453.6 2002-05-22

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7431801B2 (en) 2005-01-27 2008-10-07 The Procter & Gamble Company Creping blade
US7691236B2 (en) 2006-07-26 2010-04-06 The Procter + Gamble Company Creping blade with a highly smooth bevel surface

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1002377B (en) * 1952-08-20 1957-02-14 Krauss Maffei Ag Trunnion-free bogie guide for transferring longitudinal and transverse forces for rail vehicles
US3915757A (en) * 1972-08-09 1975-10-28 Niels N Engel Ion plating method and product therefrom
WO1986007309A1 (en) * 1985-06-14 1986-12-18 Uddeholm Strip Steel Aktiebolag Wear resistant doctor blade
EP0748701A2 (en) * 1995-05-04 1996-12-18 KURT ZECHER GmbH Ion implanted inking roll
DE29719574U1 (en) * 1997-11-04 1998-03-26 PROTEC Gesellschaft für Werkstoff- und Oberflächentechnik mbH, 57234 Wilnsdorf Improved coating system (squeegee) especially for coating paper
FR2763603A1 (en) * 1997-05-22 1998-11-27 Laurent Kropf COMPOSITE BLADE FOR USE IN PARTICULAR IN THE PAPER INDUSTRY
US6159289A (en) * 1997-10-01 2000-12-12 Voith Sulzer Papiertechnik Patent Gmbh Doctoring device for an apparatus to apply a liquid or viscid medium onto a moving base surface

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1028935A (en) * 1973-12-14 1978-04-04 Niels N. Engel Superhard martensite and method of making same
JP2821903B2 (en) * 1989-06-02 1998-11-05 日本真空技術株式会社 Surface treatment of stainless steel by ion implantation
JPH04138604A (en) * 1990-09-29 1992-05-13 Toshiba Lighting & Technol Corp Lighting device
JP2887528B2 (en) * 1990-12-25 1999-04-26 新日本製鐵株式会社 How to improve the corrosion resistance of iron alloys
DE4402988A1 (en) * 1994-02-01 1995-08-03 W W Modersohn Praezisionswerkz Improving endurance of cutting, drilling and milling tools
JPH07233466A (en) * 1994-02-24 1995-09-05 Sumitomo Metal Mining Co Ltd Corrosion resistant metallic article and its production
DE19840950A1 (en) * 1998-09-08 2000-03-09 Jagenberg Papiertech Gmbh Knife for cutting running material webs

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1002377B (en) * 1952-08-20 1957-02-14 Krauss Maffei Ag Trunnion-free bogie guide for transferring longitudinal and transverse forces for rail vehicles
US3915757A (en) * 1972-08-09 1975-10-28 Niels N Engel Ion plating method and product therefrom
WO1986007309A1 (en) * 1985-06-14 1986-12-18 Uddeholm Strip Steel Aktiebolag Wear resistant doctor blade
EP0748701A2 (en) * 1995-05-04 1996-12-18 KURT ZECHER GmbH Ion implanted inking roll
FR2763603A1 (en) * 1997-05-22 1998-11-27 Laurent Kropf COMPOSITE BLADE FOR USE IN PARTICULAR IN THE PAPER INDUSTRY
US6159289A (en) * 1997-10-01 2000-12-12 Voith Sulzer Papiertechnik Patent Gmbh Doctoring device for an apparatus to apply a liquid or viscid medium onto a moving base surface
DE29719574U1 (en) * 1997-11-04 1998-03-26 PROTEC Gesellschaft für Werkstoff- und Oberflächentechnik mbH, 57234 Wilnsdorf Improved coating system (squeegee) especially for coating paper

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
FUJIMOTO S ET AL: "Improvement of localized corrosion resistance of austenitic stainless steel by N, Cr and Mo ion implantation" ION IMPLANTATION TECHNOLOGY PROCEEDINGS, 1998 INTERNATIONAL CONFERENCE ON KYOTO, JAPAN 22-26 JUNE 1998, PISCATAWAY, NJ, USA,IEEE, US, 22. Juni 1998 (1998-06-22), Seiten 1074-1077, XP010362069 ISBN: 0-7803-4538-X *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7431801B2 (en) 2005-01-27 2008-10-07 The Procter & Gamble Company Creping blade
US7691236B2 (en) 2006-07-26 2010-04-06 The Procter + Gamble Company Creping blade with a highly smooth bevel surface

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AU2003240846A8 (en) 2003-12-02
DE10222453A1 (en) 2003-12-04
AU2003240846A1 (en) 2003-12-02
WO2003097890A3 (en) 2004-08-26
EP1509632A2 (en) 2005-03-02

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