EP2331329A1 - Racle revêtue de diamant - Google Patents

Racle revêtue de diamant

Info

Publication number
EP2331329A1
EP2331329A1 EP09818733A EP09818733A EP2331329A1 EP 2331329 A1 EP2331329 A1 EP 2331329A1 EP 09818733 A EP09818733 A EP 09818733A EP 09818733 A EP09818733 A EP 09818733A EP 2331329 A1 EP2331329 A1 EP 2331329A1
Authority
EP
European Patent Office
Prior art keywords
coating
nickel
doctor blade
squeegee
working edge
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.)
Granted
Application number
EP09818733A
Other languages
German (de)
English (en)
Other versions
EP2331329B1 (fr
Inventor
Hans Jörg BRUDERMANN
Sibylle Stiltz
Andreas HÜGLI
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
Original Assignee
Daetwyler Swisstec AG
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 Daetwyler Swisstec AG filed Critical Daetwyler Swisstec AG
Priority to PL09818733T priority Critical patent/PL2331329T3/pl
Publication of EP2331329A1 publication Critical patent/EP2331329A1/fr
Application granted granted Critical
Publication of EP2331329B1 publication Critical patent/EP2331329B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • C—CHEMISTRY; METALLURGY
    • C23—COATING 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
    • C23C—COATING 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
    • C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
    • C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
    • C23C18/1601—Process or apparatus
    • C—CHEMISTRY; METALLURGY
    • C23—COATING 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
    • C23C—COATING 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
    • C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
    • C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
    • C23C18/1601—Process or apparatus
    • C23C18/1633—Process of electroless plating
    • C23C18/1646—Characteristics of the product obtained
    • C23C18/165—Multilayered product
    • C23C18/1651—Two or more layers only obtained by electroless plating
    • C—CHEMISTRY; METALLURGY
    • C23—COATING 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
    • C23C—COATING 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
    • C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
    • C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
    • C23C18/1601—Process or apparatus
    • C23C18/1633—Process of electroless plating
    • C23C18/1655—Process features
    • C23C18/1662—Use of incorporated material in the solution or dispersion, e.g. particles, whiskers, wires
    • C—CHEMISTRY; METALLURGY
    • C23—COATING 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
    • C23C—COATING 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
    • C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
    • C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
    • C23C18/1601—Process or apparatus
    • C23C18/1633—Process of electroless plating
    • C23C18/1689—After-treatment
    • C23C18/1692—Heat-treatment
    • C—CHEMISTRY; METALLURGY
    • C23—COATING 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
    • C23C—COATING 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
    • C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
    • C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
    • C23C18/31—Coating with metals
    • C23C18/32—Coating with nickel, cobalt or mixtures thereof with phosphorus or boron
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G3/00—Doctors
    • D21G3/005—Doctor knifes

Definitions

  • the invention relates to a doctor blade, in particular for doctoring off printing ink from a surface of a printing form and / or for use as a paper doctor blade, comprising a flat and elongate base body with a working edge region formed in a longitudinal direction, wherein at least the working edge region having a first coating on the base a nickel-phosphorus alloy is coated. Furthermore, the invention relates to a method for the production and the use of a doctor blade. State of the art
  • scrapers are used, in particular, for scraping off excess printing ink from the surfaces of printing cylinders or printing rollers.
  • the quality of the squeegee has a decisive influence on the print result. Unevenness or irregularities of the standing with the impression cylinder working edges of the doctor blade lead z. B. to incomplete stripping of the ink from the webs of the printing cylinder. This can lead to an uncontrolled release of ink on the print carrier.
  • the working edge portions of the doctor blade are pressed against the surfaces of the printing cylinders or printing rollers during stripping and are moved relative thereto.
  • the working edges especially in rotary printing machines, exposed to high mechanical loads, which bring a corresponding wear. Squeegees are therefore basically consumables, which must be replaced periodically.
  • Squeegees are usually based on a steel body with a specially shaped working edge or working edge area.
  • the working edges of the doctor blade can also be provided with coatings or coatings of metals and / or plastics.
  • Metallic coatings often contain nickel or chromium, which may be mixed or alloyed with other atoms and / or compounds. The material properties of the coatings in particular have a significant influence on the mechanical and tribological properties of the doctor blade
  • squeegee for printing described which have a first layer of chemical nickel having dispersed therein hard material particles and a second layer with a low surface energy.
  • the second layer preferably consists of a coating of chemically nickel with fluorine-based resin particles or of a purely organic resin.
  • Such coated doctor blades have an improved wear resistance compared to uncoated doctor blades. However, the lifetime is still not completely satisfactory. In addition, it has been shown that it can come with the use of such squeegee, especially in the run-in phase to uncontrolled banding, which is also undesirable.
  • the object of the invention is to provide a squeegee associated with the technical field mentioned above, which has an improved wear resistance and during the entire life of a precise scraping, in particular of ink allows.
  • monocrystalline and / or polycrystalline diamond particles are dispersed in the first coating, with a particle size of the diamond particles measuring at least 5 nm and less than 50 nm.
  • nickel-phosphorus alloy which forms the basis for the first coating
  • a nickel-phosphorus alloy which forms the basis for the first coating
  • Such alloys can in particular be deposited without current and are then also referred to as chemically nickel.
  • the expression "based on a nickel-phosphorus alloy” means that the nickel-phosphorus alloy forms the main constituent of the first coating.
  • the nickel-phosphorus alloy in addition to the nickel-phosphorus alloy, there may well be other types of atoms and / or chemical compounds which have a smaller proportion than the nickel-phosphorus alloy.
  • the nickel-phosphorus alloy and any other types of atoms and / or chemical compounds present form a matrix for the monocrystalline and / or polycrystalline diamond particles.
  • the proportion of the nickel-phosphorus alloy in the matrix is preferably at least 50% by weight, particularly preferably at least 75% by weight and very particularly preferably at least 95% by weight.
  • Particularly advantageous is the matrix of the first coating except for unavoidable impurities exclusively of a nickel-phosphorus alloy.
  • the first coating is correspondingly, except for unavoidable impurities, exclusively of a nickel-phosphorus alloy having dispersed therein monocrystalline and / or polycrystalline diamond particles.
  • the monocrystalline and / or polycrystalline diamond particles are dispersed in the first coating. This means, in particular, that the diamond particles are present substantially uniformly distributed in the first coating.
  • the particle size is understood to mean, in particular, a maximum dimension and / or external dimension of the monocrystalline and / or polycrystalline diamond particles.
  • the diamond particles generally also have a certain distribution or a scattering width. Therefore, diamond particles with different particle sizes are especially present at the same time in the first coating.
  • the monocrystalline and / or polycrystalline diamond particles dispersed in the first coating based on a nickel-phosphorus alloy with the particle sizes of at least 5 nm and less than 50 nm according to the invention substantially improve the wear resistance of the working edges or working edge areas of the doctor blade , This brings in particular a long life of the inventive doctor blade with it.
  • the working edges are optimally stabilized by the first coating based on a nickel-phosphorus alloy with the diamond particles dispersed therein.
  • This results in a sharply defined contact zone between the doctor blade and the printing cylinder or the pressure roller, which in turn allows a very precise scraping or doctoring off of ink.
  • the contact zone remains over the entire life of the doctor blade or over the entire printing process largely stable.
  • the doctor blade according to the invention has extremely favorable sliding properties on the printing cylinders or printing rollers commonly used. As a result, when the doctor blade according to the invention is used for deburring, wear on the printing cylinders or printing rollers is also reduced.
  • monocrystalline and / or polycrystalline diamond particles with a particle size of at least 5 nm and less than 50 nm have proven to be the best possible choice.
  • Diamond with a mono- and / or polycrystalline structure has proven to be an optimal material for the particles according to the invention, in particular because of its high hardness and its chemical inertness with respect to a multiplicity of potential reaction partners.
  • diamond with mono- and / or polycrystalline structure is not to be confused with other forms of carbon, such as.
  • the proportion of the particle surface in relation to the particle volume is very large in comparison with particle sizes in the micrometer range. Accordingly, the particle surface, which also contacts and interacts with the surrounding nickel-phosphorus alloy, has a not insignificant influence on the properties of the diamond particles, which apparently has a positive effect on the properties of the doctor blade according to the invention.
  • a phosphorus content of the nickel-phosphorus alloy is preferably 7-12% by weight. Coatings of this kind have proven particularly suitable in combination with the monocrystalline and / or polycrystalline diamond particles according to the invention, since in particular a higher wear resistance is obtained during the entire service life of the doctor blade. A phosphorus content of 7 - 12% by weight also improves the corrosion resistance, the tarnish resistance and the inertness of the nickel-phosphorus alloy. A phosphorus content of 7 to 12% by weight also has a positive effect on the sliding properties of the doctor blade as well as the stability of the working edge, which makes it possible to paint or scrub off printing ink very precisely. Furthermore, at a phosphorus content of 7 - 12 wt% on the commonly used primers for doctor blade, such. As steel, given a good adhesion.
  • a layer thickness of the first coating is advantageously 1-10 ⁇ m. Such thicknesses of the first coating provide optimum protection of the working edge of the doctor blade. In addition, such sized first coatings have a high intrinsic stability, which effectively reduces the partial or total delamination of the first coating, for example during the doctoring of printing ink from a printing cylinder.
  • a volume density of the monocrystalline and / or polycrystalline diamond particles in the first coating is 5-20%, particularly preferably 15-20%. Squeegees with such volume densities show a very good wear resistance and a long service life. At the same time, there is also an optimally sharply defined contact zone between the doctor blade and the pressure cylinder or pressure roller, wherein the contact zone remains substantially constant or stable over the entire service life of the doctor blade.
  • hard material particles are contained in the first coating.
  • hard material particles in this context, in particular metal carbides, metal nitrides, ceramics and intermetallic phases, which preferably have a hardness of at least 1000 HV, understood. These include, for example, cubic boron nitride (BN), boron carbide (BC),
  • Chromium oxide (Cr 2 O 3 ), titanium diboride (TiB 2 ), zirconium nitride (ZrN), zirconium carbide (ZrC), titanium carbide (TiC), silicon carbide (SiC), titanium nitride (TiN), aluminum oxide or corundum (Al 2 O 3 )
  • Tungsten carbide WC
  • vanadium carbide VC
  • tantalum carbide TaC
  • zirconium dioxide ZrO 2
  • Si 3 N 4 silicon nitride
  • the additional hard material particles comprise aluminum oxide particles or particles of corundum (Al 2 O 3 ) having a particle size of 0.3-0.5 ⁇ m.
  • Such hard particles are characterized in particular by their hardness, mechanical strength, chemical resistance and good sliding properties.
  • the stability of the first coating or the nickel-phosphorus alloy in combination with the monocrystalline and / or polycrystalline diamond particles is further increased, which improves the quality of the working edge and a over the entire life of the doctor blade allows particularly uniform and accurate doctoring.
  • hard material particles as particles of aluminum oxide and / or particle sizes of less than 0.3 ⁇ m and / or provide more than 0.5 microns. Under certain circumstances, however, this is at the expense of the wear resistance and / or stability of the doctor blade. Whether and which type of additional hard material particles of the first coating is added, may also depend on the intended use of the doctor and is z. B. determined by the material and the surface finish of the printing cylinder and / or pressure rollers.
  • a second coating based on a further nickel-phosphorus alloy is arranged on the first coating.
  • a second coating based on a further nickel-phosphorus alloy can serve in particular as a protective layer for the first coating, whereby the wear resistance and stability of the working edge of the doctor blade can be further increased.
  • a second coating can serve as a stable matrix for further additives which positively influence doctoring off with the doctor according to the invention.
  • a phosphorus content of the further nickel-phosphorus alloy of the second coating is smaller than a phosphorus content of the nickel-phosphorus alloy of the first coating.
  • the combination of coatings with different proportions of phosphorus in particular a higher wear protection of the working edge is achieved while maintaining a further stabilization of the working edge.
  • a phosphorus content of the further nickel-phosphorus alloy of the second coating of 6-9% by weight has proven to be particularly suitable.
  • the phosphorus content of the further nickel-phosphorus alloy of the second coating can also be less than 6% or more than 9%. It is also possible in principle to provide a comparable phosphorus content in the first coating and the second coating or to form a higher phosphorus content in the second coating than in the first coating. However, this can be at the expense of the quality of the working edge of the doctor blade.
  • a layer thickness of the second coating measures in particular 0.5-3 ⁇ m. Such layer thicknesses guarantee, in particular, a high intrinsic stability of the second coating and at the same time a good protective effect for the first coating, which benefits the stability of the working edge as a whole. However, it is also within the scope of the invention to realize a second coating with a layer thickness of less than 0.5 .mu.m or more than 3 .mu.m. However, under certain circumstances this reduces the stability and wear resistance of the working edge of the doctor blade.
  • the second coating contains polymer particles.
  • the polymer particles advantageously contain polytetrafluoroethylene (PTFE) and in particular have a particle size of 0.5-1 ⁇ m.
  • PTFE polytetrafluoroethylene
  • polymer particles in the second coating can produce a lubricating effect, which in turn increases the sliding properties of the working edge of the doctor blade
  • Polymer particles which consist entirely of polytetrafluoroethylene have proven to be particularly advantageous, especially at a particle size of 0.5-1 ⁇ m.
  • such polymer particles contribute to a high-quality working edge, which allows a very precise and gentle for a printing cylinder and / or a pressure roller buffing.
  • polymer particles containing polytetrafluoroethylene may also contain additional polymeric materials. It is likewise possible to use polymer particles without polytetrafluoroethylene or to provide particle sizes of less than 0.5 or more than 1 ⁇ m. It is also possible to completely dispense with polymer particles in the second coating. However, the advantages mentioned above are at least partially eliminated.
  • a first coating based on a nickel-phosphorus alloy can be deposited on a working edge region of the doctor blade which is formed in a longitudinal direction of a flat and elongated base body.
  • monocrystalline and / or polycrystalline diamond particles having a particle size of at least 5 nm and less than 50 nm are dispersed in the first coating.
  • the deposition of the first coating is carried out by an electroless deposition or coating process.
  • no electric current is used in this case, as a result of which such deposition processes clearly differ from the electrodeposition techniques.
  • the working edge or optionally the entire body of the doctor blade is immersed in a suitable electrolyte bath with monocrystalline and / or polycrystalline diamond particles suspended therein and coated in a manner known per se.
  • the monocrystalline and / or polycrystalline diamond particles suspended in the electrolyte bath are incorporated into the nickel-phosphorus alloy during the coating or deposition process and are thus dispersed in the deposited nickel-phosphorus alloy essentially randomly distributed. Due to the relatively small particle size of at least 5 nm and less than 50 nm and the associated relatively large ratio of surface area to volume, the diamond particles are distributed evenly despite their considerable density in the entire electrolyte solution.
  • a high-quality first coating can be produced, which in particular has a high contour accuracy with respect to the working edge of the doctor blade or with respect to the main body of the doctor blade and a very uniform layer thickness distribution.
  • an extremely uniform nickel-phosphorus alloy with particularly uniformly distributed monocrystalline and / or polycrystalline diamond particles is formed by the electroless deposition, which optimally follows the contour of the working edge of the doctor blade or the base body, which decisively contributes to the quality of the doctor blade.
  • plastics can also be used as the basic body for the doctor blade and in a simpler manner Be provided manner with the first coating of the nickel-phosphorus alloy.
  • a second coating based on a further nickel-phosphorus alloy is applied to the first coating, it can be deposited both by an electroless plating process and by a galvanic plating process.
  • the electroless deposition has proven to be particularly suitable.
  • the first coating for curing a heat treatment in particular at a temperature of 100 - 500 0 C, in particular 170 - 300 0 C subjected.
  • the second coating is advantageously also subjected to this heat treatment.
  • the heat treatment induces solid state reactions in the nickel-phosphorus alloys which increase the hardness of the nickel-phosphorous alloys in the first coating, and optionally also in the second coating.
  • the temperatures of 100-500 ° C., especially 170-300 ° C., are preferably maintained during a holding time of 0.5-15 hours, more preferably 0.5-8 hours. Such temperatures and hold times have been found to be optimal to achieve sufficient hardness of the nickel-phosphorus alloys.
  • Temperatures of less than 100 ° C are also possible here. In this case, however, very long and mostly uneconomical holding times are required. Higher temperatures than 500 0 C are, depending on the material of the base body, in principle, also possible, as well, however, the hardening process of the nickel-phosphorus alloy is more difficult to control. In principle, however, can be completely dispensed with a heat treatment. However, this is at the expense of the wear resistance and life of the doctor blade.
  • the heat treatment advantageously takes place only after the deposition or application of the second coating on the first coating.
  • oxide formation on the surface of the first coating, which is covered by the second coating is prevented.
  • this results in better adhesion between the first coating and the second coating, and on the other hand, the overall uniformity of the doctor blade in the region of the working edge is improved.
  • a second coating is provided, it is deposited on all sides, in particular on a jacket region of the base body present with respect to the longitudinal direction, preferably on the entire base body.
  • the jacket region of the main body which is present with respect to the longitudinal direction, or preferably the entire main body, is covered on all sides with the second coating.
  • the main body can z. B. be completely immersed in the electrolyte bath. This is not possible with the sole coating of the working edge provided with the first coating, since the basic body may then have to be aligned in a complicated manner with respect to the liquid surface of the electrolyte bath.
  • FIG. 1 shows a cross section through a first inventive blade squeegee with a coating in the region of the working edge.
  • FIG. 2 shows a cross section through a second lamella blade according to the invention with a double coating in the region of the working edge
  • Fig. 3 is a schematic representation of a method for producing a
  • a first inventive fin blade 100 is shown in cross section.
  • the lamellae 10O includes a base body 1 1 1 made of steel, which on the left in Fig. 1 side has a rear portion 1 12 having a substantially rectangular cross-section.
  • a doctor blade thickness, measured from the top 1 12.1 to the bottom 1 12.2 of the rear area, is about 0.2 mm.
  • a perpendicular to the leaf level measured length of the base body 1 1 1 and the lamellae blade 100 is for example 1000 mm.
  • FIG. 1 On the right in Fig. 1 side of the main body 1 1 1 1 to form a working edge portion 1 13 and a working edge of the upper side 1 12.1 of the rear portion 1 12 ago tapers step-like.
  • An upper side 1 13.1 of the working edge 1 13 lies on a plane below the plane of the upper side 1 12.1 of the rear portion 1 12, but is substantially parallel or plane-parallel to the upper side 1 12.1 of the rear portion 1 12 formed.
  • Between the rear portion 1 12 and the working edge 1 13 is a concave shaped transition region 1 12.5 before.
  • the bottom 1 12.2 of the rear portion 1 12 and the bottom 1 13.2 of the working edge 1 13 lie in a common plane, which is plane-parallel to the top 1 12.1 of the rear portion 1 12 and plane parallel to the top 1 13.1 of the working edge 1 13 is formed.
  • a width of the base body 1 1 1, measured from the free end of the rear portion to the end face 1 14 of the working edge 1 13 measures, for example, 40 mm.
  • a thickness of the working edge 1 13, measured from the top 1 13.1 to the bottom 1 13.2 of the working edge is For example, 0.060 - 0.150 mm, which corresponds to about half the thickness of the squeegee in the rear area 1 12.
  • a free end face 1 14 of the right-hand free end of the working edge 1 13 extends from the top 1 13.1 of the working edge 1 13 obliquely to the bottom left to bottom 1 13.2 of the working edge 1 13 out.
  • the end face 1 14 has an angle of approximately 45 ° or 135 ° with respect to the upper side 1 13.1 of the working edge 1 13 or with respect to the lower side 1 13.2 of the working edge 1 13.
  • An upper transition region between the top 1 13.1 and the end face 1 14 of the working edge 1 13 is rounded.
  • a lower transition region between the end face 1 14 and the bottom 1 13.2 of the working edge 1 13 rounded.
  • the working edge 1 13 of the lamella blade 100 is further surrounded by a first coating 120.
  • the first coating 120 completely covers the top side 13.1 of the working edge 13, the concave transition area 12.5 and a subregion of the top side 12.1 of the rear area 12 of the base body 11 1 adjoining this.
  • the first coating 120 covers the end face 1 14, the underside 1 13.2 of the working edge 1 13 and a portion of the underside 1 12.2 of the rear area 1 12 of the base body 1 1 1 1 adjoining the underside 1 13.2 of the working edge 1 13.
  • the first coating 120 is z. B. essentially from a currentless deposited nickel-phosphorus alloy with a phosphorus content of z. B. 10 wt .-%. Therein polycrystalline diamond particles 120.1 having a particle size of, for example, 15-40 nm are dispersed. The volume fraction of the polycrystalline diamond particles 120.1 is z. 18%.
  • the layer thickness of the first coating 120 measures in the region of the working edge 1 13 z. B. 5 microns. In the area of the upper side 12.1 and the lower side 12.2 of the rear area 112, the layer thickness of the first coating 120 decreases continuously, so that the first coating 120 runs off in a wedge shape in a direction away from the working edge 13.
  • FIG. 2 shows another lamella blade 200 according to the invention in cross-section.
  • the lamellae blade 200 includes a base body 21 1 made of steel, which is formed substantially identical to the base body 1 1 1 of the first blade squeegee 100 of FIG. 1.
  • the working edge 213 of the second fin blade 200 is surrounded by a first coating 220.
  • the first coating 220 completely covers the upper side 213.1 of the working edge 213, the transition region 212.5 and a subregion of the upper side 212.1 of the rear region 212 of the base body adjoining this.
  • the first coating 220 covers the front side 214, the underside 213.2 of the working edge 213 and a subregion of the lower side 212.2 of the rear region 212 of the main body 21 1 which adjoins the underside 213.2 of the working edge 213.
  • the first coating 220 of the second Lammellenrakel 200 consists z. B. essentially from a currentless deposited nickel-phosphorus alloy with a phosphorus content of z. B. 12 wt .-%.
  • polycrystalline diamond particles 220.1 symbolized by circles in FIG. 2
  • hard-material particles 220.2 of aluminum oxide Al 2 O 3
  • the diamond particles 220.1 have a particle size of, for example, 15-40 nm, while the hard material particles 220.2 or the particles of aluminum oxide have a particle size of 0.4 ⁇ m.
  • the volume fraction of polycrystalline diamond particles 220.1 is z. For example 15%.
  • the layer thickness of the first coating 220 measures in the region of the working edge 213 z. B. 5 microns. In the region of the upper side 212.1 and the lower side 212.2 of the rear region 212, the layer thickness of the first coating 220 continuously decreases, so that the first coating 220 terminates in a wedge shape in a direction away from the working edge 213.
  • the first coating 220 and the remaining regions of the main body 21 1, which are not covered by the first coating 220, are completely surrounded by a second coating 221.
  • the top 212.1 and the bottom 212.2 of the rear portion 212 and the rear end face of the main body 21 1 are covered with the second coating 221.
  • the jacket region of the main body 21 1 with respect to the plane perpendicular to the plane longitudinal direction of the main body 21 1 and the second fin blade 200 is thus completely and completely surrounded by at least one of the two coatings 220, 221.
  • the plane-parallel to the sheet plane and not visible in Fig. 2 front and rear side surfaces of the main body 21 1 may also be covered with the second coating 221.
  • the second coating 221 consists of a further electroless nickel-phosphorus alloy with a phosphorus content of about 7%.
  • the phosphorus content of the first coating 210 is thus greater than the phosphorus content of the second coating 220.
  • the layer thickness of the second coating 221 is, for example, 1.8 ⁇ m.
  • polymer particles 221.1 are dispersed in the second coating 221.
  • the polymer particles 221.1 consist z.
  • Fig. 3 is a method 300 for producing a doctor blade, as z. B. in Figs. 1 and 2 are shown schematically.
  • a first step 301 the working edges 1, 13, 213 of the main body 1 1 1, 21 1 to be coated are transformed into a suitable and known aqueous electrolyte bath with polycrystalline and / or monocrystalline diamond particles 120.1, 220.1 having a particle size of, for example, 10 - 40 nm immersed.
  • additional hard particles 220 are to be installed in the coating, the additional hard particles 220 are also suspended in the electrolyte.
  • the subsequent deposition process among other nickel ions from a nickel salt, z.
  • nickel sulfate by a reducing agent, for.
  • sodium hypophosphite reduced in aqueous environment to elemental nickel and deposited on the working edges 1 13, 213 to form a nickel-phosphorus alloy and embedding the polycrystalline and / or monocrystalline diamond particles 120.1, 220.1 and, if present, the additional hard particles 220.2 .
  • This is done without the application of an electrical voltage or completely de-energized under moderately acidic conditions (pH 4 - 6.5) and at elevated temperatures, for example 70 - 95 0 C.
  • the phosphorus content in the first coatings 120, 220 can in a conventional manner by the concentrations and mixing ratios of the educts in the electrolyte bath are controlled.
  • a second coating 220 is additionally provided, in a second step 302 the base body 21 1 with the first coating 210 is introduced into a further known aqueous electrolyte bath with polymer particles 220 , B. of polytetrafluoroethylene with a particle size of 0.6 - 0.8 microns, immersed.
  • the subsequent deposition process proceeds in the same way as described in the first step 301 for the first coatings 120, 220.
  • the second step 302 is omitted and, if desired, the third step 303 is performed directly.
  • the coated base body 1 1 1, 21 1 are supplied during a heat treatment, for example, two hours and at a temperature of 300 0 C.
  • the first coatings 120, 220 and, if present, the second coating 221 cure.
  • the finished lamellae 100, 200 are cooled and ready for use.
  • the first lamella blade 100 depicted in FIG. 1 has a very high level of wear resistance and stability over the entire service life.
  • the introduction of diamond particles 120. 1 into the first coating 120 was dispensed with in a first comparative test. It has been found that such doctor blades without diamond particles have a lower wear resistance and a correspondingly shorter service life than the inventive blade doctor blade 100 from FIG. 1.
  • the second lamellae blade 200 from FIG. 2 has proved to be even more stable and wear-resistant in further test tests in comparison with the first lamella blade 100.
  • the above-described embodiments as well as the production methods are to be understood as illustrative examples only, which may be modified as desired within the scope of the invention.
  • the main body 1 1 in Fig. 1 also made of a different material, such. As stainless steel or carbon steel, be made. In this case it can be economical
  • the second coating 21 only in the region of the working edge
  • the main body 1 1 but also from a non-metallic material such. As plastics exist. This may be advantageous in particular for applications in flexographic printing.
  • the basic body can have a wedge-shaped working edge or a non-tapered cross-section with a rounded working edge.
  • the free end faces 1 14, 214 of the right-hand free ends of the working edges 1 13, 213 may for example also be formed completely rounded.
  • inventive doctor blades 100, 200 from FIGS. 1 and 2 can also be dimensioned differently.
  • the thicknesses of the working areas 1 13, 213, measured from the upper sides 1 13.1, 213.1 to the lower sides 1 13.2, 213.2 of the work areas 1 13, 213, in a range of 0.040 - 0.200 mm vary.
  • all coatings 120, 220, 221 of the two blade squeegee 100, 200 more alloy components and / or additional substances such.
  • metal atoms non-metal atoms, inorganic compounds and / or organic compounds.
  • the second coating 221 in the second sipe blade 200 it is also within the scope of the invention to omit the second coating 221 in the second sipe blade 200, so that only the first coating 210 with diamond particles 220.1 and hard material particles 220.2 dispersed therein is present on the base body 21 1.
  • the mantle regions of the base bodies 1 1 1, 21 1 it is also possible for the mantle regions of the base bodies 1 1 1, 21 1 to be completely and all around with respect to the longitudinal direction of the base bodies 1 1 1, 21 1 perpendicular to the plane of the sheet Surround the first coatings 120, 220.
  • doctor blades which brings a high wear resistance and stability of the doctor blade.
  • a more exact inking, in particular of printing ink on printing cylinders or printing rollers becomes possible, in particular during the entire service life.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Rotary Presses (AREA)
  • Chemically Coating (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Powder Metallurgy (AREA)

Abstract

L'invention concerne une racle (100, 200), en particulier pour racler l'encre d'une surface d'une forme d'impression et/ou à utiliser comme docteur pour papier, qui comprend un corps de base (111, 211) plat et allongé avec une zone de bord de travail (113, 213) réalisée dans une direction longitudinale, cette zone de bord de travail (113, 213) au moins étant revêtue d'un premier revêtement (120, 220) à base d'un alliage de nickel-phosphore. La racle (100, 200) est caractérisée en ce que des particules de diamant (120.1, 220.1) monocristallines et/ou polycristallines sont dispersées dans le premier revêtement (120, 220), les particules de diamant (120.1, 220.1) mesurant au moins 5 nm et moins de 50 nm.
EP09818733.9A 2008-10-07 2009-09-10 Racle revêtue de diamant Not-in-force EP2331329B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL09818733T PL2331329T3 (pl) 2008-10-07 2009-09-10 Rakiel z powłoką diamentową

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH01592/08A CH699702A1 (de) 2008-10-07 2008-10-07 Diamantbeschichtete Rakel.
PCT/CH2009/000303 WO2010040236A1 (fr) 2008-10-07 2009-09-10 Racle revêtue de diamant

Publications (2)

Publication Number Publication Date
EP2331329A1 true EP2331329A1 (fr) 2011-06-15
EP2331329B1 EP2331329B1 (fr) 2015-10-07

Family

ID=40329063

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09818733.9A Not-in-force EP2331329B1 (fr) 2008-10-07 2009-09-10 Racle revêtue de diamant

Country Status (11)

Country Link
US (1) US20110226144A1 (fr)
EP (1) EP2331329B1 (fr)
JP (1) JP5373917B2 (fr)
CN (1) CN102256795B (fr)
BR (1) BRPI0920669A2 (fr)
CH (1) CH699702A1 (fr)
DK (1) DK2331329T3 (fr)
ES (1) ES2554557T3 (fr)
MX (1) MX2011003523A (fr)
PL (1) PL2331329T3 (fr)
WO (1) WO2010040236A1 (fr)

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ES2572759T3 (es) 2010-01-20 2016-06-02 Daetwyler Swisstec Ag Racleta
JP5614538B2 (ja) * 2010-09-30 2014-10-29 アイテック株式会社 複合めっき被膜の形成方法
DE102010062901A1 (de) * 2010-12-13 2012-06-14 Voith Patent Gmbh Imprägnierte Klingenbeschichtung
CN102199764A (zh) * 2011-05-11 2011-09-28 芜湖海成科技有限公司 一种金刚石复合镀镀层
EP2823100A4 (fr) * 2012-03-08 2016-03-23 Swedev Aktiebolag Racle à revêtement multicouche réalisée par électrodéposition sous impulsions de courant
EP3178654A1 (fr) * 2015-12-10 2017-06-14 Daetwyler Swisstec Ag Racleur
TWI574846B (zh) * 2016-02-18 2017-03-21 財團法人工業技術研究院 凹版印刷裝置
EP3308961A1 (fr) * 2016-10-13 2018-04-18 Daetwyler Swisstec Ag Lames avec revêtement appliqué par projection thermique
GB2560969A (en) * 2017-03-30 2018-10-03 Ajt Eng Ltd Electroless plating
KR102018879B1 (ko) * 2018-01-24 2019-09-05 국방과학연구소 내마모성 이중 코팅 구조체
DK4004256T3 (da) 2019-07-26 2024-02-26 Eni Spa Nikkel-phosphorkomposit med flere lag
CN112038558B (zh) * 2020-07-23 2022-11-18 惠州锂威新能源科技有限公司 一种极片涂层刮除系统及极片涂层刮除方法

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JPH04116198A (ja) * 1990-08-31 1992-04-16 Tokyo Daiyamondo Kogu Seisakusho:Kk ダイヤモンド共析メッキ被膜およびそのメッキ法
EP1197584A1 (fr) * 2000-10-10 2002-04-17 BTG Eclépens S.A. Lame de couchage et procédé de fabrication d'une lame de couchage
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
JP4325901B2 (ja) * 2002-01-29 2009-09-02 日本ニュークローム株式会社 表面処理ドクターブレード
US7152526B2 (en) * 2002-01-29 2006-12-26 Nihon New Chrome Co., Ltd. Surface treated doctor blade
JP3913118B2 (ja) * 2002-06-13 2007-05-09 忠正 藤村 超微粒ダイヤモンド粒子を分散した金属薄膜層、該薄膜層を有する金属材料、及びそれらの製造方法
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Also Published As

Publication number Publication date
PL2331329T3 (pl) 2016-01-29
CN102256795A (zh) 2011-11-23
ES2554557T3 (es) 2015-12-21
US20110226144A1 (en) 2011-09-22
CN102256795B (zh) 2015-03-11
DK2331329T3 (en) 2016-01-04
CH699702A1 (de) 2010-04-15
EP2331329B1 (fr) 2015-10-07
MX2011003523A (es) 2011-05-02
JP5373917B2 (ja) 2013-12-18
JP2012505087A (ja) 2012-03-01
WO2010040236A1 (fr) 2010-04-15
BRPI0920669A2 (pt) 2015-12-29

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