EP3308961A1 - Lames avec revêtement appliqué par projection thermique - Google Patents

Lames avec revêtement appliqué par projection thermique Download PDF

Info

Publication number
EP3308961A1
EP3308961A1 EP16193762.8A EP16193762A EP3308961A1 EP 3308961 A1 EP3308961 A1 EP 3308961A1 EP 16193762 A EP16193762 A EP 16193762A EP 3308961 A1 EP3308961 A1 EP 3308961A1
Authority
EP
European Patent Office
Prior art keywords
ceramic
blade
suspension
coating
based coating
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.)
Pending
Application number
EP16193762.8A
Other languages
German (de)
English (en)
Inventor
Hans Jörg BRUDERMANN
Michael Reinert
Sibylle Stiltz
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 EP16193762.8A priority Critical patent/EP3308961A1/fr
Publication of EP3308961A1 publication Critical patent/EP3308961A1/fr
Pending legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/20—Ink-removing or collecting 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N10/00—Blankets or like coverings; Coverings for wipers for intaglio printing
    • B41N10/005—Coverings for wipers
    • 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 blade, in particular for printing and / or papermaking applications, comprising a flat and elongated base body having a working edge portion formed in a longitudinal direction, the working edge portion being coated with at least one ceramic-based coating. Furthermore, the invention relates to a method for producing corresponding blades, blades obtainable by the manufacturing method and various uses of the blades according to the invention.
  • blades are used, in particular in the form of a doctor blade, to remove excess printing ink from the surfaces of printing cylinders or printing rollers.
  • Such blades are usually based on a steel body with a specially shaped working edge.
  • the quality of the blades or doctor blade has a decisive influence on the printing 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 edges of the doctor blade are pressed against the surfaces of the printing cylinders or printing rollers during the ink removal and are moved relative thereto.
  • the working edges especially in rotary printing machines, exposed to high mechanical loads, which bring a corresponding wear.
  • Such blades are therefore basically consumables, which must be replaced periodically. Therefore, to improve the quality and life of the blades, the working edges of the blades are usually provided with coatings or coatings. Often, coatings based on metals, alloys, hard materials or plastics are used. The material properties of the coatings in particular have a significant influence on the mechanical and tribological properties of the blades.
  • the doctor blade From the DE 601 07 902 T2 (BTG Ecleplens SA) is known, for example, a doctor blade which is suitable for flexographic printing.
  • the doctor blade has a ceramic coating on the working edge which is preferably based on Al 2 O 3 and comprises ZrO 2 and optionally TiO 2 .
  • the hardness of the ceramic coating corresponds to 0.55 - 0.8 times the hardness of a ceramic sleeve of an inking roller which with the doctor blade is used.
  • the ceramic is applied by atmospheric plasma spraying (APS).
  • Blades are also used in papermaking, for example in the form of doctor blades, doctor blades, creping scrapers or perforation blades.
  • paints are paints consisting of pigments, binders and additives, e.g. applied or painted on the paper surface to improve the feel or printability.
  • the scraping of the excess coating material is effected by doctor blade, which is pressed elastically against the running through the coater paper web. By applying the pressure of the doctor blade while the order quantity of the coating materials can be controlled. In this process, the blades or blades are exposed to high loads.
  • the WO 2007/003332 A1 (BTG Ecléplens SA) a blade or a doctor blade for applying coating color to a paper web.
  • the blade has a multi-layered construction with a metallic substrate which is coated with an intermediate layer and a wear-resistant topcoat.
  • the intermediate layer has a lower thermal conductivity than the cover layer and may consist, for example, of oxides, oxide mixtures, ceramics, ceramics with metals, ceramics with polymer material, polymer material with ceramic filler, a polymer material, zirconium oxide or titanium oxide.
  • the cover layer may, for example, metal, Carbide or cermet-based.
  • the intermediate layer is applied in particular by plasma spraying or high-speed spraying (HVOF), while for the covering layer the high-speed spraying is described as advantageous.
  • HVOF high-speed spraying
  • This special layer structure is intended in particular to solve the problem of deformation of the doctor blade by heat input.
  • the object of the invention is therefore to provide the above-mentioned technical field associated blades and manufacturing processes, which overcome the above-mentioned disadvantages as possible.
  • the blades should be used as far as possible for applications in the field of printing technology as well as in papermaking.
  • the blades should in particular enable accurate painting, in particular of printing ink and / or coating color, throughout the entire service life.
  • the blades should also be advantageous with respect to thermal shock resistance and wear resistance and be as efficient and inexpensive to produce.
  • the invention relates to a blade, in particular for printing and / or papermaking applications, comprising a flat and elongated base body having a working edge portion formed in a longitudinal direction, the working edge portion being coated with at least one ceramic-based coating , This is a ceramic-based coating applied by a thermal suspension spray process.
  • a blade in particular for a tool that is designed for applications in printing and / or in papermaking.
  • a blade is a device for applying a fluid to a printing plate and / or a paper substrate, a device for stripping a fluid from a printing plate and / or a paper substrate, a device for folding and / or folding Paper, and / or a device for perforating a paper.
  • the blade is a squeegee, a doctor blade, a doctor blade, a creping doctor and / or a perforation blade.
  • the blade is a squeegee, especially for printing applications, or the blade is a doctor blade, especially for papermaking.
  • thermal spray process is well known to those skilled in the art. These are surface coating methods, in particular according to standard ISO 14917: 1999-08, in which filler materials, the so-called spray additives, inside or outside of a sprayer off, on or melted and spin coated on a surface to be coated (see also DIN EN 657). The surfaces to be coated are usually not melted.
  • the spray additives are typically in solid form, e.g. as powder or wires.
  • Known thermal spraying methods are, for example, plasma spraying or flame spraying, in particular high-speed flame spraying (HVOF).
  • HVOF high-speed flame spraying
  • Corresponding apparatuses are known to the person skilled in the art and are commercially available.
  • thermal suspension spraying or “thermal suspension spraying process” is understood to mean a thermal spraying process in which a suspension is used as spraying additive.
  • a suspension is a heterogeneous mixture of a liquid and finely divided solids.
  • the filler materials or the coating material are supplied to the sprayers in the form of suspensions.
  • the thermal suspension spraying process can be carried out, for example, on adapted equipment for flame spraying.
  • an apparatus for Flame spraying can be supplemented with a suspension conveyor.
  • Corresponding devices are known per se to the person skilled in the art and are available, for example, from Northwest Mettech Corp. commercially available. A suitable device is also in the patent application WO 2006/116844 A (National Research Council of Canada).
  • ceramic-based coating means that at least one ceramic forms the major constituent of the coating. This particular based on the weight. In this case, in the ceramic-based coating in addition to at least one ceramic quite different types of atoms and / or chemical compounds are present, which have a smaller proportion, in particular a lower weight fraction, as the ceramic.
  • the proportion of the at least one ceramic in the ceramic-based coating is preferably at least 50% by weight, particularly preferably at least 70% by weight and very particularly preferably at least 80% by weight or at least 90% by weight.
  • the ceramic-based coating is up to unavoidable impurities exclusively from the at least one ceramic.
  • the blades according to the invention have high wear resistance or wear resistance and, correspondingly, a long service life, both in applications in printing technology and in use in papermaking.
  • the blades according to the invention also show high thermal shock resistance, which is advantageous especially in papermaking or when used as a doctor blade.
  • the tendency to deform the blades upon application and the subsequent addition of the coating color can be greatly reduced, especially over conventional blades.
  • the blades are thus relatively insensitive to dry friction and the associated heat input.
  • the working edges of the inventive blades are optimally stabilized.
  • this results in a sharply defined contact zone between the blade, which in this case is in particular a doctor blade, and the impression cylinder or the Pressure roller, which in turn allows extremely accurate ink removal.
  • the contact zone remains largely stable over the entire printing process.
  • the blades or squeegees according to the invention form significantly less stripes during the break-in phase in the printing process or otherwise cause effects impairing the printing process.
  • the blades according to the invention therefore make it possible to achieve a substantially constant printing quality during the entire printing process.
  • the blades according to the invention have extremely favorable sliding properties on the printing cylinders or printing rollers commonly used. As a result, wear of the printing cylinders or printing rollers is reduced when using the inventive blades for doctoring.
  • inventive blades have proven to be a particularly advantageous working doctor blade for chamber doctor blade systems for flexographic printing. This in particular in combination with a plastic squeegee or a plastic composite material, which takes into account the reduced lubricating film on this side of the doctor chamber.
  • the inventive blades which are in this case in particular doctor blade, have proven to be advantageous.
  • a high stability of the working edge can be achieved despite abrasive wear. This greatly reduces the likelihood that grains will erupt from the surface of the blade tip, which in turn reduces the formation of streaks on the paper web.
  • the advantages of the blades according to the invention can also be achieved with a single coating. It is therefore possible to dispense with complicated multiple coatings. Accordingly, the inventive doctor blades can also be produced efficiently and inexpensively.
  • the ceramic-based coating is applied by a thermal suspension spraying process.
  • a conventional thermal spraying method such as plasma spraying or high-speed flame spraying (HVOF) powder-based
  • the advantages of the invention do not appear to the same extent or not at all.
  • the coatings produced by the thermal spray-injection process differ from differently prepared coatings. Investigations have also shown that coatings applied by conventional high velocity flame spraying have a laminar texture and a relatively high density of microstructural defects, e.g. Pores have cracks and unfused particles. By contrast, the coatings produced using the thermal suspension spray method according to the invention show a different microstructure with significantly fewer defects (fewer and smaller pores and cracks) and thus have lower porosity.
  • particles can be used, which arise in the conventional thermal spraying in overspray as waste.
  • the overspray is a particle that has not reached the workpiece to be coated in a spraying process. These particles are usually too small to be recycled.
  • waste products can be harnessed by the suspension spray technology. This leads in addition to the advantages mentioned above to a high efficiency of the process, as well as to a good ecological balance.
  • the ceramic-based coating comprises an oxide ceramic and / or a non-oxide ceramic.
  • the main component of the ceramic-based coating consists of an oxide ceramic and / or a non-oxide ceramic.
  • Particularly preferred is an oxide ceramic.
  • the ceramic-based coating to at least 50 wt .-%, more preferably at least 70 wt .-% and most preferably at least 80 wt .-% or at least 90 wt .-% of the Oxide ceramic and / or the non-oxide ceramic.
  • the ceramic-based coating consists of unavoidable impurities from the oxide ceramic and / or the non-oxide ceramic. Particularly preferred is an oxide ceramic.
  • the oxide ceramic if present, is in particular selected from the group consisting of Al 2 O 3 , Cr 2 O 3 , Fe 2 O 3 , TiO 2 , ZrO 2 , SiO 2 , CeO 2 , and / or MgO. Particularly preferably, the oxide ceramic is selected from the group consisting of Al 2 O 3 and Cr 2 O 3 , with Cr 2 O 3 being particularly preferred.
  • the non-oxide ceramic advantageously comprises a carbide, nitride, boride and / or a silicide.
  • the non-oxide ceramic consists of one or more of these representatives.
  • the non-oxide ceramic is selected from the group consisting of WSi 2 , SiC, TiC, WC, VC, ZrC, TaC, Cr 3 C 2 , B 4 C, BN, ZrB 2 , TiN, Si 3 N 4 , ZrB 2 and / or TiB 2 .
  • Particularly suitable are SiC and / or BN.
  • the ceramic-based coating comprises or consists of an oxide ceramic.
  • oxide ceramics are in particular one or more of the abovementioned representatives of oxide ceramics, the oxide ceramics in particular selected from the group consisting of Al 2 O 3 and Cr 2 O 3 . Cr 2 O 3 is particularly advantageous.
  • a hardness of the ceramic-based coating is advantageously 1,200-2,200 HV 0.1, in particular 1,400-2,000 HV 0.1, preferably 1,600-1,900 HV 0.1, in particular 1,700-1 800 HV 0.1.
  • the wear resistance of the blade is increased.
  • measurements are made in accordance with the standard DIN EN ISO 6507-1: 2005 bis - 4: 2005.
  • a thickness of the ceramic-based coating generally measures advantageously 5 to 300 ⁇ m, in particular 10 to 200 ⁇ m, preferably 15 to 150 ⁇ m, in particular 20 to 100 ⁇ m.
  • the thickness of the ceramic-based coating is advantageously 5-100 ⁇ m, in particular 10-75 ⁇ m, preferably 15-50 ⁇ m, in particular 20-30 ⁇ m.
  • the thickness of the ceramic-based coating is advantageously in the range of 20-300 ⁇ m, in particular 30-200 ⁇ m, preferably 50-150 ⁇ m, in particular 75-125 ⁇ m or at approximately 100 ⁇ m.
  • Such thicknesses of the ceramic-based coating provide optimum protection of the working edge of the blade.
  • such sized coatings have a high intrinsic stability, which effectively reduces the partial or total delamination of the coating, for example during the doctoring of printing ink from a printing cylinder or when applying coating color to paper. It has also been found that the layer thicknesses mentioned are particularly advantageous with respect to thermal shock resistance.
  • a porosity of the ceramic-based coating is less than 5%, in particular less than 2.5%, preferably less than 1% or less than 0.5%.
  • the porosity is measured in particular according to the technical rule DVS 2318: 2011-07 ("Selected technological properties and characteristics of thermally sprayed layers") of the German Association for Welding and Related Processes e.V. It has been found that in such porosities, the wear resistance and thermal shock resistance of the blades can be greatly improved. In addition, when such blades are used for color doctoring in a printing process or for spreading paint on papermaking, it is possible to obtain extremely consistent results throughout the life of the blades.
  • the average roughness Ra of the ceramic-based coating, without post-processing of the coating measured according to DIN EN ISO 4287: 2010, in the range of 0.1-10 ⁇ m, in particular 0.5-5 ⁇ m, preferably 1-3 ⁇ m, in particular 1.1-2 ⁇ m or 1.3-1.9 ⁇ m. Due to the suspension spraying method used according to the invention, such values for the mean roughness Ra can be achieved without problems. Thus, the blades have clearly defined working edges. Since relatively low roughness values are already achieved, the cost of any reworking of the working edge is reduced considerably. In principle, however, ceramic-based coatings with other roughnesses can also be realized.
  • the ceramic-based coating contains at least one additional component, in particular for improving the wear behavior of the blade.
  • the working edge of the blade can be optimally adapted to specific requirements.
  • the additive component comprises e.g. at least one metal, hard particles and / or lubricating particles.
  • a suitable metal is eg molybdenum.
  • Advantageous hard material particles are in particular selected from the group consisting of BN, TiN, SiC, B 4 C, VC, TiC, and / or TaC.
  • Particularly preferred lubricating particles are h-BN, MoS 2 and / or graphite.
  • the main body of the blade comprises or is advantageously made of steel and / or plastic, with steel being particularly preferred. Steel has proved to be a particularly robust and suitable material for the blades according to the invention in mechanical terms.
  • the base body In addition to or instead of steel, however, other metals or metal alloys may also be used as the base body, for example.
  • plastic base bodies have proved to be more advantageous than steel base bodies because of their different mechanical and chemical properties. So, some of those in question As compared to typical water-based and slightly acidic printing inks, these resins have sufficient chemical stability or inertness, with which the basic body does not need to be specially protected, as in the case of a base body made of steel.
  • plastic material z. B polymer materials in question. These may be, inter alia, thermoplastic, thermosetting and / or elastomeric polymer materials. Suitable plastics are z. As polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyvinyl alcohol, polyethylene terephthalate, polyamide, polyacetal, polycarbonate, polyarylate, polyetheretherketone, polyimide, polyester, polytetrafluoroethylene and / or polyurethane. Composite structures with fibers to reinforce the polymer matrix are also possible.
  • basic body which z. B. consist of both metal, especially steel, as well as plastic. Also basic body with other materials, eg. As ceramics and / or composite materials, may be suitable for specific applications, where appropriate.
  • At least one jacket region of the base body which is present with respect to the longitudinal direction is completely and completely covered with a ceramic-based coating and / or a further coating.
  • a ceramic-based coating and / or a further coating As a result, at least the working edge, the upper side, the lower side and the rear edge of the main body opposite the working edge are covered with at least one coating.
  • the side surfaces of the main body that are perpendicular to the longitudinal direction may be uncoated.
  • the ceramic-based coating and / or a further coating to cover the main body completely and on all sides. In this case, therefore, the side surfaces of the main body which are perpendicular to the longitudinal direction are also covered with one of the coatings.
  • the ceramic-based coating is arranged directly on the main body of the blade, wherein the base body advantageously consists of steel and / or plastic.
  • the ceramic-based coating it is also within the scope of the invention, between the main body of the blade and the ceramic-based coating one or more intermediate layers to arrange. It is likewise possible to apply one or more additional cover layers to the ceramic-based coating.
  • the main body of the blade which is advantageously made of steel and / or plastic, coated only with the ceramic-based coating.
  • the blade has no further coatings.
  • Such coating can be produced particularly time-saving and economical. Nevertheless, very good properties can be achieved.
  • At least one cover layer is arranged on the ceramic-based coating.
  • the cover layer comprises in particular a non-ceramic coating, an organic coating and / or a coating comprising a polymer.
  • a cover layer can have the advantage that the ceramic-based coating is additionally protected against abrasive wear and unwanted rheological effects are reduced. Additionally, the cover layer may reduce the tendency of fluids or paint to adhere, for example, by a lower surface tension compared to the ceramic-based coating. This results in particularly advantageous blades, which is particularly evident in the case of doctor blades, doctor blades, creping doctor blades and scraper blades.
  • exactly one cover layer is arranged on the ceramic-based coating.
  • the main body of the blade which advantageously consists of steel and / or plastic, is only coated with the ceramic-based coating and precisely one covering layer.
  • the blade has no further coatings.
  • the coating comprising a polymer preferably comprises more than 50% by weight (weight percent) of polymers, in particular more than 75% by weight of polymers, particularly preferably more than 90% by weight of polymers. Further, the polymer content is preferably less than 99% by weight, more preferably less than 95% by weight. Polymers are thus preferably the main constituent of the coating. The aforementioned proportions of the polymers in the coating are based on the coating of the ready-to-use blades.
  • the polymer comprises or consists in the present case in particular of an organic polymer.
  • the polymer may be a homopolymer or a copolymer.
  • Homopolymers consist essentially of a single type of monomer, while copolymers consist of two, three or more chemically different types of monomers. It is also possible that the polymer is in the form of a so-called polymer blend or as a mixture of several different homopolymers and / or copolymers.
  • the polymer is a thermoset, thermoplastic and / or an elastomer.
  • Preferred are e.g. Thermosets.
  • Thermosets have a three-dimensional cross-linking after hardening and usually can not be deformed after they have hardened.
  • suitable polymers include polyurethane resins, epoxy resins, phenolic resins such as phenol-formaldehyde resins (novolaks and resoles), melamine-formaldehyde resins, and saturated and unsaturated polyester resins or mixtures thereof.
  • the polymers may further comprise rubber, polyurethanes, polyureas, thermoplastics or mixtures thereof.
  • the thermoplastics may include, for example, acrylonitrile butadiene styrene, polyamide, polycarbonate, polyethylene, polypropylene, polystyrene, polyvinyl chloride, or mixtures thereof.
  • the skilled worker is also aware of other possible polymers which may be provided in pure form or as mixtures for the production of the coating.
  • the polymer mixtures may in particular comprise two or more different polymers.
  • an additive may be present in the at least one cover layer, in particular for improving the wear behavior of the blade.
  • the working edge of the blade can be optimally adapted to specific requirements.
  • the additive comprises, for example, at least one metal, hard material particles and / or lubricating particles.
  • a suitable metal is, for example, Mo.
  • Advantageous hard material particles are in particular selected from the group consisting of BN, TiN, SiC, B 4 C, VC, TiC, and / or TaC.
  • Particularly preferred lubricating particles are h-BN, MoS 2 and / or graphite.
  • a layer thickness of the cover layer is preferably 1 to 30 ⁇ m. This in particular, if it is an organic coating and / or a coating comprising a polymer. More preferably, the layer thickness of the cover layer is 5-20 ⁇ m, more preferably 5-10 ⁇ m. Such layer thicknesses provide optimum protection of the working edge of the doctor blade. In addition, such measured layer thicknesses have a high intrinsic stability, which effectively reduces the partial or complete delamination of the first coating, for example during the doctoring of printing ink from a printing cylinder.
  • cover layers with thicknesses of less than 1 ⁇ m are possible, the wear resistance of the working edge or the doctor blade decreases rapidly. Greater thicknesses than 30 microns are also feasible. However, these are generally less economical and may also negatively affect the quality of the working edge. However, for special application areas of the doctor blade, cover layers with thicknesses of less than 1 ⁇ m or more than 30 ⁇ m can be quite advantageous.
  • Another aspect of the present invention relates to a method of making a blade, particularly a blade as described above, wherein a working edge portion of the blade formed on an elongated base in a longitudinal direction is provided with at least one ceramic-based coating.
  • the ceramic-based coating is applied by a thermal suspension spray process.
  • a suspension containing dispersed ceramic particles is used therein.
  • the ceramic particles preferably within and / or outside of a spraying device, are ablated, fused and / or melted and accelerated in the form of a particle stream onto the working edge regions of the squeegee.
  • the ceramic particles in particular have an average particle size in the range of 5 nm-20 ⁇ m, in particular 10 nm-10 ⁇ m, preferably 15 nm-5 ⁇ m, especially 100 nm-1 ⁇ m.
  • the particle size, their distribution or the average particle size of the ceramic particles are determined in particular by laser diffraction, preferably in accordance with standard ISO 13320: 2009.
  • the mean particle size here corresponds in particular to the D50 value (50% of the particles are smaller than the specified value, 50% correspondingly larger).
  • the suspension advantageously has a solids content of from 0.1 to 75% by weight, preferably from 0.5 to 50% by weight, in particular from 1 to 30% by weight, based on the total weight of the suspension.
  • the solvent used for the suspension is advantageously water, alcohol, glycol and / or mixtures thereof.
  • alcohol is e.g. Methanol, ethanol, propanol and / or isopropanol usable, in particular ethanol.
  • Suitable glycols are, for example, ethylene glycol and / or propylene glycol. Ethylene glycol is particularly preferred.
  • the suspension comprises in particular at least one wetting agent and / or at least one stabilizer. These are in particular selected from the group of anionic surfactants and / or cationic surfactants. This makes it possible to increase the stability or homogeneity of the suspension as the tendency of phase separation between ceramic particles and solvents is reduced. Sedimentation and / or agglomeration of the ceramic particles is thus best possible reduced. In addition, the stability of the suspension can be improved over time. Overall, the layer quality of the at least one ceramic-based coating can thus be improved.
  • the suspension is advantageously mixed at least temporarily, preferably continuously, during the thermal suspension spraying process. This is done in particular by a mechanical mixer, preferably by a stirrer. Mixing of the suspension may be in lieu of or in addition to the use of wetting agents and / or stabilizers and causes an improvement in the stability or homogeneity of the suspension. Particularly preferably, the mixing takes place in combination with the use of at least one wetting agent and / or at least one stabilizer. As a result, the stability and / or homogeneity of the suspension can be increased disproportionately.
  • a delivery rate of the suspension during the thermal suspension spraying process is preferably in the range of 1 to 500 ml / min, in particular 5 to 120 ml / min, preferably 20 to 100 ml / min. As a result, optimum deposition rates are achieved in the region of the working edge of the blade. In principle, however, other delivery rates are possible.
  • the ceramic particles are accelerated to a speed of 350-700 m / s during the thermal spray-injection process. This has been found in the present context as the optimum speed, which lead to an optimum coating for blades for most of the interesting ceramic materials. Other speeds may also be suitable, especially in connection with special ceramic materials.
  • the ceramic particles are advantageously heated during the suspension spraying process to a temperature of 250-3,500 ° C., in particular 1,000-3,200 ° C., preferably 2,000-3,000 ° C. Most interesting ceramic materials are so molten at these temperatures that particularly dense and low-defect coatings are obtained, which in turn comes to the layer quality.
  • a mixture of fuel, in particular kerosene, is advantageously burned together with oxygen.
  • a plasma is generated during the suspension spraying, in particular in an arc.
  • the plasma has temperatures of 5,000 - 30,000 Kelvin.
  • an inert gas and / or a noble gas is used as gas for generating the plasma.
  • an additional gas in particular an inert gas and / or compressed air, is injected, preferably for increasing the kinetic energy of the particle stream and / or for shaping the particle stream.
  • the spray device has a nozzle, in particular an expansion nozzle, wherein preferably the additional gas is injected in a region of a nozzle outlet opening of the nozzle.
  • an apparatus for plasma spraying and / or an apparatus for flame spraying are used for the suspension spraying, wherein the suspension is injected into a flame and / or a plasma of the apparatus.
  • Such apparatus are commercially available.
  • an apparatus for high-velocity flame spraying (HVOF) and / or an apparatus for atmospheric plasma spraying in particular with an upstream suspension conveyor and / or a suspension injector, is used for the suspension spraying, wherein the suspension is injected into a flame and / or the plasma of the apparatus.
  • HVOF high-velocity flame spraying
  • an apparatus for atmospheric plasma spraying in particular with an upstream suspension conveyor and / or a suspension injector, is used for the suspension spraying, wherein the suspension is injected into a flame and / or the plasma of the apparatus.
  • the suspension is injected into a combustion chamber of the apparatus, in particular an apparatus for high-speed flame spraying (HVOF) or for atmospheric plasma spraying.
  • HVOF high-speed flame spraying
  • the suspension is injected in a substantially axial direction with respect to a direction of a nozzle outlet opening of the apparatus, in particular an apparatus for high-speed flame spraying (HVOF) or for atmospheric plasma spraying.
  • the direction of the nozzle exit opening particularly denotes the direction of the normal vector of the area formed by the nozzle exit opening. This direction corresponds in particular to a direction of movement of the particle flow when leaving the nozzle opening.
  • substantially in the axial direction is meant that the direction of the injection to the direction of the nozzle outlet opening forms an angle of 0-30 °, in particular 0-15 °, especially 0-5 ° or 0-1 °.
  • the suspension is injected in a substantially radial direction with respect to a nozzle outlet opening of the apparatus, in particular a device for high-speed flame spraying (HVOF) or for atmospheric plasma spraying.
  • HVOF high-speed flame spraying
  • substantially in the radial direction is meant that the direction of the injection to the direction of the nozzle outlet opening forms an angle of 60-90 °, in particular 75-90 °, especially 85-90 ° or 89-90 °.
  • the suspension is advantageously injected into the flame and / or the plasma at a pressure of 0-6 bar, in particular 1-5 bar.
  • steps a) to c) are carried out in particular in the order given.
  • a chamfer or a chamfered surface is also ground in the uncoated working edge region.
  • a further coating can be applied before and / or after step a).
  • a lamella is in particular a working edge area which is narrower in terms of thickness.
  • a lamella thickness including coating is for example 60-150 .mu.m, in particular 70-120 .mu.m, preferably 70-90 .mu.m.
  • the layer thickness of the ceramic-based coating is in particular ⁇ 40 microns and / or> 5 microns, in particular 20 - 30 microns.
  • the method allows, for example, for the first time high-quality lamella blade, in particular with a structure such as those in the EP 0 911 157 A1 (MDC Max Daetwyler Bleienbach AG) to produce by a thermal suspension spraying process.
  • a structure such as those in the EP 0 911 157 A1 (MDC Max Daetwyler Bleienbach AG)
  • Other processes in which the grinding of the blade or the production of the lamella occurs before the coating have the disadvantage that, due to the high thermal and kinetic energies during the application of the coatings, deformations of the relatively thin lamella can occur in the working edge region Quality of the squeegee deteriorates.
  • the invention relates to a blade, which is obtainable by a method as described above.
  • an apparatus set comprising a blade according to the invention and at least one further blade, which is located in structurally different.
  • it is a set of equipment for a chambered doctor blade system, especially for flexographic printing.
  • the at least one further blade consists in particular of a plastic material or a plastic composite material.
  • the further blade comprises or consists of a polymer material.
  • a polymer material may be, inter alia, thermoplastic, thermosetting and / or elastomeric polymer materials.
  • Suitable polymer materials or plastics are, for. As polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyvinyl alcohol, polyethylene terephthalate, polyamide, polyacetal, polycarbonate, polyarylate, polyetheretherketone, polyimide, polyester, polytetrafluoroethylene and / or polyurethane.
  • Composite structures with fibers to reinforce the polymer matrix are also possible.
  • the set of equipment is in particular part of a chambered doctor blade system, in particular for flexographic printing.
  • a chambered doctor blade system comprises a chamber, which is pressed with an opening against a printing plate and contains the paint to be applied to the printing form. The excess ink picked up by the printing form during a relative movement between the printing form and the chamber (for example, by rotation of a printing cylinder relative to a fixed chamber) is thereby scraped off by the so-called working doctor.
  • the so-called closing squeegee On the other side of the chamber is the so-called closing squeegee, which produces a seal between the printing plate and chamber.
  • the blades according to the invention are used in particular as a work doctor blade.
  • the other blade acts in particular as a squeegee.
  • the further doctor blade comprises or is at least in the working edge region a coating of an organic material, in particular a plastic or a plastic composite material.
  • a doctor blade 100 according to the invention for applications in flexographic printing is shown in cross-section.
  • the doctor blade 100 includes a base body 110 made of steel, which has a substantially rectangular cross-section throughout.
  • a rear portion 120 of the doctor blade which is provided as a mounting portion to hold the doctor blade, for example, in a corresponding receiving device of a printing press.
  • a doctor blade thickness, measured from the upper side 121 to the lower side 122 of the rear region 120, is for example 0.2 mm.
  • the in Fig. 1a The region of the main body 110 which is shown on the right-hand side and faces away from the rear region 120 is referred to as the working edge region 130.
  • the working edge region extends up to an end face 140 of the main body 110 facing away from the rear region 120.
  • a width of the main body 110, measured from the end of the rear region to the front side 140 of the working edge region 130 measures, for example, 40 mm.
  • the working edge region 130 of the doctor blade 100 is furthermore coated in the region of the upper side 121 of the base body with a coating 150 which is cuboid in cross section.
  • the cuboid coating 150 forms the actual working edge of the doctor blade 100 during operation.
  • the coating 150 is a ceramic based coating applied by suspension high speed flame spraying (a thermal suspension spray method). The procedure is described in more detail later in Chapter 3.
  • the coating consists z. B. completely from Cr 2 O 3 and has a porosity of 0.5%.
  • the layer thickness of the coating 150 measures in the region of the working edge 130 z. B. 200 microns, while the hardness z. B. 1'800 HV 0.1 (measured according to standard DIN EN ISO 6507-1: 2005).
  • the mean roughness Ra of the coating 150 measured according to DIN EN ISO 4287: 2010, is for example 2.5 ⁇ m.
  • the squeegee 100b shown is essentially the same as the squeegee 100 except for the coating Fig. 1a ,
  • the elements 110b, 120b, 121b, 122b, 130b, 140b, 150b of the doctor blade 100b correspond to the respective ones in FIG Fig. 1a
  • the doctor 100b has Cr 2 O 3 (this is substantially the same design as the coating 150) Fig. 1 ) on all sides or on all sides, ie on the free sides of the ceramic-based coating 150b, the free rear region 120b of the main body and the free working edge region 130b of the main body 110b, via a cover layer 151b.
  • the cover layer 151b is a polymer-based coating based on a thermosetting polymer such as an epoxy resin.
  • a thickness of the cover layer 151b is, for example, 5 ⁇ m.
  • the cover layer 151b additionally protects the coating 150b and the free base 130b from abrasive wear and reduces unwanted rheological effects.
  • Fig. 2 shows a paper doctor blade 200 in cross section.
  • the blade 200 has a main body 210 made of steel, with a substantially cuboid cross-section.
  • On the in Fig. 2 left side is a rear portion 220, which is provided for example as a mounting area.
  • a thickness of the blade 200, measured from the upper side 221 to the lower side 222 of the main body, is for example 0.3 mm.
  • a working edge region 230 is formed which extends up to a front side 240 of the main body 110 facing away from the rear region 220.
  • the base body has a chamfer 241 running obliquely to the upper side 221 or the front side 240.
  • the chamfer 241 as well as the area at the upper side 221 of the working edge area 230 of the paper coating blade 200 is further provided with a coating 250.
  • the front side 240 and the bottom working edge 230 are not coated and are exposed.
  • the coating is a ceramic based coating applied by suspension high velocity flame spraying. This procedure is described in more detail later in Chapter 4.
  • the coating 250 is z. B. completely from Cr 2 O 3 and has a porosity of 0.5%.
  • the layer thickness of the coating 250 measures in the region of the working edge 230 z. B. 100 microns, while the hardness z. B. 1'700 HV 0.1 (measured according to standard DIN EN ISO 6507-1: 2005).
  • the average roughness Ra of the coating 250, measured in accordance with DIN EN ISO 4287: 2010, is, for example, 1.3 ⁇ m without post-processing of the coating.
  • Fig. 3 schematically shows a cross section through a first sprayer 300 for suspension spraying.
  • the sprayer 300 essentially corresponds to a device for high-speed flame spraying (HVOF).
  • the spray device 300 has a hollow cylindrical combustion chamber 310, which opens into a nozzle 320 in the direction of its longitudinal axis.
  • the combustor 310 has at one end opposite the nozzle 320 via a first tubular inlet 311 and a second tubular inlet 313.
  • the first inlet 311 serves, for example, to supply a fuel 312, such as kerosene.
  • reactive gas such as oxygen, may be directed into the combustion chamber 310 via the second inlet 313.
  • the inner cavity of the nozzle 320 is configured conical, wherein an inner diameter of the cavity, starting from the end, which faces the combustion chamber 310, continuously tapers in the direction of the nozzle outlet opening 321.
  • a longitudinal axis of the conical cavity of the nozzle 320 extends in the continuation of the longitudinal axis of the hollow cylindrical combustion chamber 310.
  • two tubular inlet ports 322.a, 322.b. open from the opposite direction.
  • the longitudinal axes of the tubular inlet ports 322.a, 322.b lie on a straight line and extend approximately perpendicular to the longitudinal axis of the conical cavity of the nozzle 320.
  • a fuel / oxygen mixture is passed under pressure into the combustion chamber 310 and ignited, so that in the direction of the nozzle 320 extending Flame 315 is generated.
  • the resulting combustion gases are accelerated in the direction of the nozzle 320 and exit at the nozzle opening 321 from the sprayer 300.
  • a suspension 323 containing ceramic particles dispersed therein can be injected into the flame 315 extending through the nozzle 320.
  • the suspension is thus injected in the direction of the nozzle outlet opening 321 in the radial direction.
  • the ceramic particles in the flame 315 are ab-, on or melted and accelerated out of the nozzle together with the combustion gases in the form of a particle beam.
  • Fig. 4 schematically shows a cross section through a second sprayer 400 for suspension spraying. This too is essentially based on a device for high-speed flame spraying (HVOF).
  • the second spray unit 400 includes a hollow cylindrical mixing chamber 410.a, which opens in the direction of its longitudinal axis into a slightly smaller with respect to the inner diameter hollow cylindrical combustion chamber 410.b.
  • the longitudinal axes of the mixing chamber 410.a and the combustion chamber 410.b run along a common straight line.
  • the combustion chamber 410.b opens at the end, which faces away from the mixing chamber, into a nozzle 420.
  • the mixing chamber 410.a has at one end, which is opposite to the combustion chamber 420.b, via a first tubular inlet 411, a second tubular inlet 413 and via an inlet pipe 422.
  • the first inlet 411 serves for example for the supply of a fuel 412, such as kerosene.
  • a fuel 412 such as kerosene.
  • reactive gas such as oxygen
  • a suspension 423 containing dispersed ceramic particles can be injected into the mixing chamber 410.a.
  • the suspension is injected in the direction of the nozzle outlet opening 421 in the axial direction.
  • the mixing chamber 410.a serves to premix the substances supplied via the two inlets 411, 413 and the inlet connection 422 and then to supply them to the ignition of the combustion chamber 410.b.
  • the inner cavity of the nozzle 420 is largely hollow cylindrical and tapers conically in the region of the nozzle outlet opening 421.
  • a longitudinal axis of the inner cavity of the nozzle 420 extends in the continuation of the longitudinal axis of the hollow cylindrical mixing chamber 410.a and the longitudinal axis of the hollow cylindrical combustion chamber 410.b.
  • a fuel / oxygen mixture together with the suspension 423 containing pre-mixed therein dispersed ceramic particles passed under pressure into the combustion chamber 410.b and ignited. This results in a flame 415 extending in the direction of the nozzle 420, in which the ceramic particles are deposited off, on or melted, and are ejected out of the nozzle 420 through the nozzle 420 and in the form of a particle jet.
  • Fig. 5 is shown schematically a cross section through a third sprayer 500 for suspension spraying.
  • the third sprayer 500 has a mixing chamber 510.a and a combustion chamber 510.b having a first tubular inlet 511 and a second tubular inlet 513 substantially similar to that in FIG Fig. 4 shown second sprayer 400 are formed.
  • the two inlets 511, 513 are used accordingly, for example, to supply a fuel and a reactive gas in the mixing chamber 510.a, where the two components can be premixed.
  • the third spraying device 500 comprises an inlet stub 522 which, however, has a longer design than the second spraying device 400, so that it protrudes into the combustion chamber 510.b.
  • a suspension 523 with ceramic particles dispersed therein is injected directly into the combustion chamber 510.b or a flame 515 burning therein. Accordingly, as with the sprayers 300, 400 described above, the ceramic particles are accelerated through the nozzle 520 in the form of a particle stream and ejected therefrom.
  • the inner cavity of the nozzle 520 of the third sprayer 500 which adjoins the combustion chamber 510.b, tapers in a first section in the direction of Nozzle outlet opening 521 steadily and subsequently expands steadily in a second section.
  • two tubular gas inlets 530.a, 530b in an oblique direction or at an angle of about 80 ° to the direction of the nozzle exit opening 521 in the inner cavity of the nozzle 520.
  • About the two gas inlets 530th a, 530.b can eg an inert gas and / or compressed air 531 are directed into the internal cavity of the nozzle 520.
  • a particle jet of combustion gases and ceramic particles moving through the nozzle 520 can additionally be influenced, for example, it can be shaped and / or further accelerated with respect to the spatial extent.
  • all sprayers 300, 400, 500 also have a cooling system consisting of several arranged in the side walls of cooling water pipes and an igniter for igniting fuels and / or reactive gases.
  • Fig. 6 shows the third sprayer 500 in combination with a suspension conveyor 600.
  • a suspension 611 with ceramic particles dispersed therein.
  • the suspension consists for example of Cr 2 O 3 particles, a wetting agent and ethanol.
  • An average particle size of the Cr 2 O 3 particles is, for example, 1 ⁇ m.
  • the wetting agent is, for example, a polyacrylate.
  • the proportion of Cr 2 O 3 particles is 25 wt .-%, while the proportion of the dispersant is 1 wt .-%, each based on the total weight of the suspension 611.
  • the first container 610 has a first pressure-generating device 614, For example, a compressed air connection, with which the suspension under pressure, a pressure of 0 - 6 bar can be set.
  • the first container 611 includes a mechanical mixer in the form of a stirrer 612 immersed in the suspension.
  • the container 610 communicates via a piping system 615 comprising three three-way valves 640, 650, 670 and a flow meter 660 with the inlet port 522 of the sprayer 500. As soon as sufficient pressure is applied to the suspension 611 via the pressure-generating device 614, this is replaced by the Piping system 615 promoted in the sprayer 500 where in the operation of the sprayer 500, as related to Fig. 5 described, is injected directly into the flame 515.
  • a second container 620 which is also connected to the piping system 615.
  • a rinsing liquid e.g. Ethanol and water. If the three-way valves 640, 650, 670 set accordingly, the piping system 615, the sprayer 500 and / or the first container 610 can be cleaned with the rinsing liquid.
  • the second container 620 has a second pressure-generating device 622, which is formed substantially the same as the first pressure-generating device 614.
  • the rinsing liquid under a pressure of 0 - 6 bar set and thus through the piping system 615, the sprayer 500th and / or into the first container 610.
  • a third container 630 which also communicates with the piping system 615 and serves, for example, for collecting residual rinsing liquid.
  • the apparatus shown is, for example, proceeded as follows:
  • the above-described suspension 611 with Cr 2 O 3 particles is conveyed into the sprayer 500 at a delivery rate of 20-100 ml / min. This is done by applying a pressure of 1-5 bar with the first pressure-generating device 614.
  • Kerosene (about 25 l / h) or oxygen (about 50 m 3 / h) is also added via the inlets 511, 513.
  • the sprayer is operated in such a way that a flame temperature of 2'500 ° C results and the present in the suspension 611 ceramic particles are accelerated to a speed of about 500 m / s.
  • Nitrogen is supplied as inert gas via the two tubular gas inlets 530.a, 530b.
  • the main body points in Fig. 7a on the right side on a free end face 740.
  • an upper chamfer 741 is then ground in a manner known per se so that a section of the free end face 740 remains (FIG. Fig. 7b ).
  • the chamfer 741 has an angle of 10 to 60 °, for example approximately 30 °, relative to the coplanar underside 721 or upper side 722 of the main body 700.
  • a coating 750 made of a ceramic-based material is applied by a suspension spraying method, for example as described in Section 4.1.
  • the coating 750 thus covers the chamfer 741 and a portion of the upper side 721 of the base body 700 adjoining the upper chamfer.
  • the remaining free end face 740 of the doctor blade in the working edge region 730, the underside 722 of the doctor blade or the base body 700 and a working edge 730 facing away In contrast, the area of the doctor blade is not coated. This is in Fig. 7c shown.
  • this is post-processed, eg by grinding and polishing.
  • an end of the coating 750 facing away from the working edge 730 is chamfered on the upper side 721 of the base body 700, so that a termination 751 formed as a chamfer is formed.
  • the reworked doctor blade is in Fig. 7d shown.
  • the bottom 722 of the base body 700 in the working edge region 730 becomes to a depth of approximately 50% of the original thickness ground away, so that in the working edge region 730 a lamella 760 is formed, which is opposite the rear region or the working edge region 730 opposite end of the doctor tapers.
  • This is in Fig. 7e shown.
  • Part of the coating 750 is also ground away, so that the base body 700 and seamlessly into the coating 750 passes.
  • the actual working edge of the lamella blade thus produced during operation is formed by the coating 750.
  • the squeegee 100, 100b allow a very accurate ink removal in gravure and flexo printing. This over the entire life of the squeegee.
  • the blade 200 has proven to be extremely advantageous as a doctor blade in papermaking.
  • the blade 200 has a high thermal shock resistance, since no significant deformations of the doctor blade could be observed during use. Furthermore, when scraping coating color with the blade 200, undesirable streaking on the paper web can be largely avoided.
  • a chamber doctor blade system 800 pressed on the left side of a rotatable printing cylinder D is shown.
  • the chamber doctor blade system 800 is exemplified by an in Fig. 8 not shown pneumatic pressed against the pressure cylinder D and comprises a cross-sectionally U-shaped chamber 810, which is aligned with its opening to the printing cylinder D out.
  • a closing squeegee 840 made of plastic is attached, which points at an angle of about 30 ° to the leg 811 in the direction of the center of the printing cylinder D.
  • leg 812 of the U-shaped chamber 810 is a working doctor blade 830 attached.
  • the working doctor blade 830 protrudes at an angle of approximately 30 ° to the second leg 812 in the direction of the center of the printing cylinder D.
  • the working doctor blade 830 is a blade or doctor blade according to the invention, for example with a coating as shown in FIG FIG. 1 is described.
  • the two doctor blades 830, 840 rest against the printing cylinder D and seal the inner region 820 between the two legs 811, 812, which is filled with printing ink 821.
  • the ink 821 is received on the surface of the printing cylinder D. Excess paint is stripped off by the working doctor blade 830.
  • the main body 100, 100b, 200 of the blades from the Fig. 1a, 1b and 2 also from another material, such.
  • a carbon steel or a non-metallic material in particular a plastic or composite material, such as glass fiber reinforced plastic (GRP) and / or carbon fiber reinforced plastic (CFRP), be made.
  • GRP glass fiber reinforced plastic
  • CFRP carbon fiber reinforced plastic
  • each base body may have a wedge-shaped working edge or a tapered cross-section with a rounded working edge.
  • the free end faces 140, 140b of the working edges 130, 130b of the doctor blade Fig. 1a and 1b For example, it can also be completely rounded.
  • the inventive blades from the Fig. 1a, 1b and 2 also be different dimensions. So you can look at the squeegee Fig. 1a and 1b
  • the thicknesses of the working areas 130, 130b measured from the top to the bottom be larger or smaller.
  • these thicknesses can vary in a range of 0.040 - 0.200 mm.
  • the coatings of the blades from the Fig. 1a, 1b and 2 at least one additional component or additives in the form of metals, hard particles and / or Contain lubricating particles.
  • Particularly preferred lubricating particles are h-BN and / or polytetrafluoroethylene.
  • the ceramic-based coatings from the squeegee Fig. 1a, 1b and 2 made of other ceramic materials.
  • the coatings of the squeegee 100 may be made Fig. 1a and that of the blade 200 Fig. 2 be prepared from Al 2 O 3 .
  • a mixture of Al 2 O 3 and Cr 2 O 3 can be used.
  • All of the in the Fig. 1a, 1b and 2 shown blades can be coated for example with other coatings.
  • the further coatings may be present in working edge areas and / or in rear areas and z. B. further improve the wear resistance of the working edges and / or protect the rear areas from influences by aggressive chemicals.
  • the blades from the Fig. 1a, 1b and 2 to provide an additional layer, eg an adhesion-promoting layer, between the ceramic coatings and the base body.
  • spraying equipment can also be used for plasma spraying devices.
  • a cathode / anode pair may be provided, with which an arc for plasma generation can be generated when using a DC power source.
  • plasma gas for example, a noble gas can be used.
  • a suspension 323 can then be injected directly into the plasma via the tubular inlet connection 322.a, 322.b. It is understood that in this case it is not necessary to feed and ignite fuel / oxygen mixture.
  • novel blades have been created, which are particularly advantageous for printing and paper making.
  • the blades are characterized by an extremely high wear resistance and allow a uniform and streak-free stripping of printing and coating color throughout the service life.
  • the blades according to the invention can be produced efficiently and inexpensively in a wide variety of embodiments.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Coating By Spraying Or Casting (AREA)
EP16193762.8A 2016-10-13 2016-10-13 Lames avec revêtement appliqué par projection thermique Pending EP3308961A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP16193762.8A EP3308961A1 (fr) 2016-10-13 2016-10-13 Lames avec revêtement appliqué par projection thermique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16193762.8A EP3308961A1 (fr) 2016-10-13 2016-10-13 Lames avec revêtement appliqué par projection thermique

Publications (1)

Publication Number Publication Date
EP3308961A1 true EP3308961A1 (fr) 2018-04-18

Family

ID=57133084

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16193762.8A Pending EP3308961A1 (fr) 2016-10-13 2016-10-13 Lames avec revêtement appliqué par projection thermique

Country Status (1)

Country Link
EP (1) EP3308961A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019104407A1 (de) * 2019-02-21 2020-08-27 EPIC Consulting GmbH Verfahren zur Herstellung eines beschichteten Kunststoffbauteils

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2128551A (en) * 1982-10-13 1984-05-02 Inventing Ab Scraper with wear-resistant coating
FR2733720A1 (fr) * 1995-05-05 1996-11-08 Heidelberg Harris Sa Lame de machine rotative a imprimer offset
EP0911157A1 (fr) 1997-10-24 1999-04-28 MDC Max Dätwyler Bleienbach AG Racle pour l'enlèvement de l'encre superflue de la surface d'une plaque
DE60107902T2 (de) 2000-01-25 2005-05-19 BTG Eclépens S.A. Rakelblatt
WO2006116844A1 (fr) 2005-05-02 2006-11-09 National Research Council Of Canada Procede et appareil destines a la suspension de particules fines dans un liquide, destines a un systeme d'aerosol thermique, et revetements formes au moyen de ces procede et appareil
WO2007003332A1 (fr) 2005-07-01 2007-01-11 BTG Eclépens S.A. Lame enduite améliorée
DE102008001721A1 (de) * 2008-05-13 2009-11-19 Voith Patent Gmbh Verfahren zum Beschichten einer Klinge
WO2010040236A1 (fr) * 2008-10-07 2010-04-15 Daetwyler Swisstec Ag Racle revêtue de diamant

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2128551A (en) * 1982-10-13 1984-05-02 Inventing Ab Scraper with wear-resistant coating
FR2733720A1 (fr) * 1995-05-05 1996-11-08 Heidelberg Harris Sa Lame de machine rotative a imprimer offset
EP0911157A1 (fr) 1997-10-24 1999-04-28 MDC Max Dätwyler Bleienbach AG Racle pour l'enlèvement de l'encre superflue de la surface d'une plaque
DE60107902T2 (de) 2000-01-25 2005-05-19 BTG Eclépens S.A. Rakelblatt
WO2006116844A1 (fr) 2005-05-02 2006-11-09 National Research Council Of Canada Procede et appareil destines a la suspension de particules fines dans un liquide, destines a un systeme d'aerosol thermique, et revetements formes au moyen de ces procede et appareil
WO2007003332A1 (fr) 2005-07-01 2007-01-11 BTG Eclépens S.A. Lame enduite améliorée
DE102008001721A1 (de) * 2008-05-13 2009-11-19 Voith Patent Gmbh Verfahren zum Beschichten einer Klinge
WO2010040236A1 (fr) * 2008-10-07 2010-04-15 Daetwyler Swisstec Ag Racle revêtue de diamant

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019104407A1 (de) * 2019-02-21 2020-08-27 EPIC Consulting GmbH Verfahren zur Herstellung eines beschichteten Kunststoffbauteils

Similar Documents

Publication Publication Date Title
EP2525984B1 (fr) Racloir
EP2331329B1 (fr) Racle revêtue de diamant
EP2491159B1 (fr) Utilisation d'une poudre à pulvériser pour appliquer un revêtement de cermet à des lames de racles
WO2012156152A1 (fr) Enduction par rouleau résistante à la corrosion
EP2943541B1 (fr) Laque avec microstructure
EP1117488A1 (fr) Dispositif et procede permettant d'appliquer un agent fluide sur une surface mobile
EP3184177B1 (fr) Volet d'aération et système de buse pour un pistolet pulvérisateur et pistolet pulvérisateur
EP0532134B1 (fr) Procédé et appareil pour revêter un substrat avec un polymère résistant à la chaleur
DE102005038453B4 (de) Verfahren und Vorrichtung zum thermischen Spritzen von Suspensionen
EP3308961A1 (fr) Lames avec revêtement appliqué par projection thermique
DE102009052946A1 (de) Verfahren und Vorrichtung zur Bauteilbeschichtung
DE19653911A1 (de) Druckmaschinenwalze mit einer farbfreundlichen Beschichtung der Ballenfläche des Walzenkerns, insbesondere Farbwalze
DE102005062204A1 (de) Verschleißschutzbeschichtung
EP2328754B1 (fr) Racle
EP3386753A1 (fr) Racle
DE69432931T9 (de) Korrektur und markierungsmaterial
DE102008007679B4 (de) Druckwerk für eine Verarbeitungsmaschine
EP1115950A1 (fr) Racle en forme de tige destinee a un dispositif de recouvrement
DE202017105119U1 (de) Abstreifer für flexible Materialbahnen von einer Walze
DE3302317A1 (de) Farbdosierelement, insbesondere farbmesser oder farbschieber, fuer das farbwerk einer rotationsdruckmaschine
EP2622135A1 (fr) Dispositif d'application directe ou indirecte d'une substance à appliquer liquide ou pâteuse et procédé de fonctionnement d'un tel dispositif
DE102018009153A1 (de) Beschichtungsvorrichtung und beschichtungsverfahren
DE102014204007B4 (de) Farbwerk einer Rotationsdruckmaschine
EP3904593A1 (fr) Racleur à découpe pour feuilles de matières flexibles à partir d'un rouleau
DE3717882A1 (de) Verfahren zum strukturfreien auftrag von dispersionen auf flexiblen traegermaterialien

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN PUBLISHED

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20181008

RBV Designated contracting states (corrected)

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: EXAMINATION IS IN PROGRESS

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: EXAMINATION IS IN PROGRESS

17Q First examination report despatched

Effective date: 20201013

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: EXAMINATION IS IN PROGRESS