EP2328754B1 - Rakel - Google Patents
Rakel Download PDFInfo
- Publication number
- EP2328754B1 EP2328754B1 EP09817159A EP09817159A EP2328754B1 EP 2328754 B1 EP2328754 B1 EP 2328754B1 EP 09817159 A EP09817159 A EP 09817159A EP 09817159 A EP09817159 A EP 09817159A EP 2328754 B1 EP2328754 B1 EP 2328754B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coating
- nickel
- doctor blade
- working edge
- main body
- 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.)
- Active
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- 238000000576 coating method Methods 0.000 claims abstract description 148
- 239000011248 coating agent Substances 0.000 claims abstract description 141
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 90
- OFNHPGDEEMZPFG-UHFFFAOYSA-N phosphanylidynenickel Chemical compound [P].[Ni] OFNHPGDEEMZPFG-UHFFFAOYSA-N 0.000 claims abstract description 46
- 229910001096 P alloy Inorganic materials 0.000 claims abstract description 45
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 45
- 239000000463 material Substances 0.000 claims abstract description 36
- 239000002245 particle Substances 0.000 claims abstract description 33
- 230000008021 deposition Effects 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims description 24
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 15
- 229910052698 phosphorus Inorganic materials 0.000 claims description 15
- 239000011574 phosphorus Substances 0.000 claims description 15
- CVHZOJJKTDOEJC-UHFFFAOYSA-N saccharin Chemical compound C1=CC=C2C(=O)NS(=O)(=O)C2=C1 CVHZOJJKTDOEJC-UHFFFAOYSA-N 0.000 claims description 12
- 229940081974 saccharin Drugs 0.000 claims description 9
- 235000019204 saccharin Nutrition 0.000 claims description 9
- 239000000901 saccharin and its Na,K and Ca salt Substances 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 8
- 239000010432 diamond Substances 0.000 claims description 3
- 229910003460 diamond Inorganic materials 0.000 claims description 3
- 238000009713 electroplating Methods 0.000 claims 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims 1
- 229910052799 carbon Inorganic materials 0.000 claims 1
- 229910052593 corundum Inorganic materials 0.000 claims 1
- 229910001845 yogo sapphire Inorganic materials 0.000 claims 1
- 239000003792 electrolyte Substances 0.000 description 13
- 239000000976 ink Substances 0.000 description 9
- 235000019589 hardness Nutrition 0.000 description 8
- 229910045601 alloy Inorganic materials 0.000 description 5
- 239000000956 alloy Substances 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 5
- 239000012535 impurity Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 230000007704 transition Effects 0.000 description 5
- 241000446313 Lamella Species 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000002378 acidificating effect Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- INZDTEICWPZYJM-UHFFFAOYSA-N 1-(chloromethyl)-4-[4-(chloromethyl)phenyl]benzene Chemical compound C1=CC(CCl)=CC=C1C1=CC=C(CCl)C=C1 INZDTEICWPZYJM-UHFFFAOYSA-N 0.000 description 2
- 229910052580 B4C Inorganic materials 0.000 description 2
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 229910021586 Nickel(II) chloride Inorganic materials 0.000 description 2
- 229910026551 ZrC Inorganic materials 0.000 description 2
- OTCHGXYCWNXDOA-UHFFFAOYSA-N [C].[Zr] Chemical compound [C].[Zr] OTCHGXYCWNXDOA-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000007772 electroless plating Methods 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 150000002484 inorganic compounds Chemical class 0.000 description 2
- 229910010272 inorganic material Inorganic materials 0.000 description 2
- NFFIWVVINABMKP-UHFFFAOYSA-N methylidynetantalum Chemical compound [Ta]#C NFFIWVVINABMKP-UHFFFAOYSA-N 0.000 description 2
- QMMRZOWCJAIUJA-UHFFFAOYSA-L nickel dichloride Chemical compound Cl[Ni]Cl QMMRZOWCJAIUJA-UHFFFAOYSA-L 0.000 description 2
- LGQLOGILCSXPEA-UHFFFAOYSA-L nickel sulfate Chemical compound [Ni+2].[O-]S([O-])(=O)=O LGQLOGILCSXPEA-UHFFFAOYSA-L 0.000 description 2
- 229910000363 nickel(II) sulfate Inorganic materials 0.000 description 2
- 229910052755 nonmetal Inorganic materials 0.000 description 2
- 150000002894 organic compounds Chemical class 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 238000007790 scraping Methods 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 229910003468 tantalcarbide Inorganic materials 0.000 description 2
- MTPVUVINMAGMJL-UHFFFAOYSA-N trimethyl(1,1,2,2,2-pentafluoroethyl)silane Chemical compound C[Si](C)(C)C(F)(F)C(F)(F)F MTPVUVINMAGMJL-UHFFFAOYSA-N 0.000 description 2
- KWSLGOVYXMQPPX-UHFFFAOYSA-N 5-[3-(trifluoromethyl)phenyl]-2h-tetrazole Chemical compound FC(F)(F)C1=CC=CC(C2=NNN=N2)=C1 KWSLGOVYXMQPPX-UHFFFAOYSA-N 0.000 description 1
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- QYEXBYZXHDUPRC-UHFFFAOYSA-N B#[Ti]#B Chemical compound B#[Ti]#B QYEXBYZXHDUPRC-UHFFFAOYSA-N 0.000 description 1
- 229910052582 BN Inorganic materials 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- VEQPNABPJHWNSG-UHFFFAOYSA-N Nickel(2+) Chemical compound [Ni+2] VEQPNABPJHWNSG-UHFFFAOYSA-N 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 229910033181 TiB2 Inorganic materials 0.000 description 1
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 1
- MCMNRKCIXSYSNV-UHFFFAOYSA-N ZrO2 Inorganic materials O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005137 deposition process Methods 0.000 description 1
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000010327 methods by industry Methods 0.000 description 1
- 150000002815 nickel Chemical class 0.000 description 1
- 229910001453 nickel ion Inorganic materials 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 229910001379 sodium hypophosphite Inorganic materials 0.000 description 1
- 238000003746 solid phase reaction Methods 0.000 description 1
- 238000010671 solid-state reaction Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- ZVWKZXLXHLZXLS-UHFFFAOYSA-N zirconium nitride Chemical compound [Zr]#N ZVWKZXLXHLZXLS-UHFFFAOYSA-N 0.000 description 1
Images
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
-
- 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
Definitions
- the invention relates to a squeegee, in particular for doctoring ink from a surface of a printing form, comprising a flat and elongated base body having a working edge region formed in a longitudinal direction, the working edge region having a first coating based on a nickel-phosphorus electroless alloy is coated and wherein in the first coating hard material particles are dispersed. Furthermore, the invention relates to a method for producing a doctor blade.
- 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.
- Squeegees are usually based on a steel body with a specially shaped working edge.
- 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.
- WO 2003/064157 (Nihon New Chrome Co. Ltd.) are z. B. squeegee for printing described, which have a first layer of chemically nickel with 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. The lifetime is still not completely satisfactory. In addition, it has been shown that uncontrolled banding can occur when using such doctor blades, especially in the running-in phase, which is likewise undesirable.
- the object of the invention is therefore to provide a the technical field mentioned above squeegee, which has an improved wear resistance and during the entire life of a precise scraping, in particular of printing ink allows.
- the first coating is coated with a second coating based on electrodeposited nickel.
- electroless deposited nickel-phosphorus alloy which forms the basis for the first coating
- Such alloys are deposited without current or without external current and are also referred to as chemical nickel.
- electroless nickel-phosphorous alloy based means that the electroless nickel-phosphorus alloy is the main constituent of the first coating.
- other types of atoms and / or chemical compounds which have a smaller proportion than the electrolessly deposited nickel-phosphorus alloy may well be present in the first coating.
- the proportion of electrolessly deposited nickel-phosphorus alloy in the first coating is preferably at least 50% by weight, particularly preferably at least 75% by weight and very particularly preferably at least 95% by weight.
- the first coating is unavoidable Impurities exclusively from a currentless deposited nickel-phosphorus alloy with dispersed therein hard material particles.
- hard material particles include, in particular, metal carbides, metal nitrides, ceramics and intermetallic phases, which preferably have a hardness of at least 1000 HV.
- metal carbides metal nitrides, ceramics and intermetallic phases, which preferably have a hardness of at least 1000 HV.
- These include, for example, diamond (C), 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), corundum (Al 2 O 3 ), tungsten carbide (WC), vanadium carbide (VC), tantalum carbide (TaC), zirconium dioxide (ZrO 2 ) and / or silicon nitride (Si 3 N 4 ).
- the expression "based on electrodeposited nickel” means that the electrodeposited nickel, which is deposited by means of electricity from an electrolyte bath, forms the main component of the second coating.
- other types of atom and / or chemical compounds may still be present in the second coating, which have a smaller proportion than the electrodeposited nickel.
- a nickel alloy with other types of atoms and / or chemical compounds may also be present.
- the proportion of the electrodeposited nickel in the second coating is preferably at least 50% by weight, particularly preferably at least 75% by weight and very particularly preferably at least 95% by weight.
- the second coating is in particular substantially free of phosphorus.
- phosphorus can be present as an unavoidable impurity in the smallest amounts, in particular in a proportion of less than 0.1% by weight, also in the second coating.
- the second coating, except for unavoidable impurities, consists exclusively of electrodeposited nickel.
- the second coating comprises a galvanically deposited nickel-phosphorus alloy.
- a galvanically deposited nickel-phosphorus alloy is understood in this context, a mixture of nickel and phosphorus, wherein the phosphorus content especially at 12-15 wt .-% and the remaining portion is preferably made of pure nickel.
- the phosphorus content of the galvanically deposited nickel-phosphorus alloy can in principle also be less than 12% by weight or more than 15% by weight, which however has a partially disadvantageous effect in the context according to the invention.
- the deposition of the electrodeposited nickel-phosphorus alloy is carried out with the aid of electricity from an electrolyte bath.
- the electroformed nickel-phosphorus alloy of the second coating differs in particular with respect to the microstructure and elasticity of the electroless deposited nickel-phosphorus alloy of the first coating.
- nickel-phosphorous alloy based means that the electrodeposited nickel-phosphorus alloy is the main constituent of the second coating.
- the second coating in addition to the galvanically deposited nickel-phosphorus alloy, there may well be other types of atoms and / or chemical compounds which have a smaller proportion than the galvanically deposited nickel-phosphorus alloy.
- the proportion of the electrodeposited nickel-phosphorus alloy in the second coating is preferably at least 50% by weight, particularly preferably at least 75% by weight and very particularly preferably at least 95% by weight. Particularly suitable is the second coating except for unavoidable impurities exclusively from a galvanically deposited nickel-phosphorus alloy.
- doctor blades are used for comparison purposes with a comparable overall layer thickness as the doctor blade according to the invention either only with the first coating (electroless nickel-phosphorus alloy with dispersed hard material particles) or only with the second coating (coating based on electrodeposited nickel) provided, resulting in significantly lower wear resistance and service life than in the inventive doctor blades.
- the working edges are optimally stabilized by the combination of the first coating of electrolessly deposited nickel-phosphorus alloy with dispersed hard material particles and the second coating based on electrodeposited nickel.
- This results in a sharply defined contact zone between the doctor blade and the printing cylinder or the pressure roller, which in turn allows extremely accurate ink stripping.
- the contact zone remains largely stable over the entire printing process.
- doctoring devices according to the invention do not form any stripes during the running-in phase in the printing process or otherwise cause effects which impair the printing process.
- the doctor according to the invention therefore makes it possible to achieve a substantially constant printing quality during the entire printing process.
- the composition of the second coating based on electrodeposited nickel depends essentially on the intended application of the doctor blade. This plays z. B. the material and the surface condition of the printing cylinder or the pressure roller an essential role.
- a second coating comprising an electrodeposited nickel-phosphorous alloy is generally somewhat harder and more corrosion resistant than a nickel-based nickel-based coating which is substantially free of phosphorus.
- At least one jacket region of the main body which is present with respect to the longitudinal direction is completely and completely covered with the second coating.
- 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 the second coating.
- the side surfaces of the main body that are perpendicular to the longitudinal direction may be uncoated.
- the second coating the body completely and Covered on all sides, so also the present perpendicular to the longitudinal direction side surfaces of the body are covered with the second coating. In this case, the second coating surrounding the body so all around.
- the essential regions of the main body which do not belong to the working edge and are not covered with the first coating are also provided with the second coating.
- This is particularly advantageous in order to protect the main body from the water-based or slightly acidic printing inks and / or other fluids coming into contact with the doctor blade.
- base bodies made of steel so optimal rust protection for the doctor blade is created.
- the constancy of the print quality during the printing process is further improved, since the printing cylinder or printing roller in contact with the doctor blade during the printing process is not contaminated by rust particles, for example.
- the basic body is best protected against rust formation by a second coating applied in the jacket area during storage and / or transport.
- the quality of the doctor blade further improves.
- hard material particles of SiC and / or Al 2 O 3 and / or diamond and / or BN are present.
- the hard material particles preferably have particle sizes of less than 1 .mu.m, in particular from 0.3 to 0.5 .mu.m.
- a volume fraction of the hard material particles in the first Coating is especially at 5-20%. Squeegees with such hard particles are characterized in particular by an extremely good wear resistance and long life.
- a phosphorus content of the first coating is 7-12% by weight.
- Such coatings have proven to be optimal in combination with the second coating based on electrodeposited nickel or the second coating based on the electrodeposited nickel-phosphorus alloy, since both a high wear resistance and the best possible and constant stability during the entire life of the squeegee is obtained.
- the phosphorus content of the first coating can also be less than 7% by weight or greater than 12% by weight.
- the aforementioned advantageous properties of the doctor are thereby impaired.
- the first coating has a hardness of 750-1400 HV.
- the wear resistance of the doctor is increased.
- lower hardnesses than 750 HV are also possible, the wear resistance of the doctor blade decreases. If the hardness is higher than 1400 HV, the printing cylinder or roller may be damaged, reducing the print quality.
- a thickness of the first coating preferably measures 5 to 30 ⁇ m, in particular 7 to 20 ⁇ m.
- Such thicknesses of the first coating provide optimum wear resistance for the inventive doctor blade. Thicknesses of 7-20 ⁇ m have proven to be particularly suitable. Thicknesses of less than 5 microns are possible, but the wear resistance decreases rapidly. Greater thicknesses than 30 microns are also feasible. These are one hand but not economically and in part have a negative impact on the quality of the working edge.
- a thickness of the second coating preferably measures 1-8 ⁇ m, in particular 1.5-5 ⁇ m.
- Such thicknesses of the second coating, in particular in combination with a first coating having a thickness of 5 to 30 ⁇ m, or preferably 7 to 20 ⁇ m, provide optimum wear resistance and stability of the working edge of the doctor blade according to the invention.
- the second coating may also have a thickness less than 1 ⁇ m or a thickness greater than 8 ⁇ m.
- the quality of the working edge decreases.
- the thickness of the second coating in the region of the working edge is advantageously approximately twice as thick as in the region of the center of the doctor blade surface or in a region behind the working edge.
- the second coating preferably comprises a base layer of pure nickel adjoining the first coating and a cover layer arranged above it, a thickness of the base layer measuring 0.2-0.8 ⁇ m, in particular 0.4-0.6 ⁇ m, and wherein the cover layer comprises saccharin and / or a saccharin salt contains.
- the base layer of pure nickel is, except for unavoidable impurities, preferably exclusively of nickel.
- such a second coating has high adhesion to the first coating and possibly also to the main body.
- the second coating due to the top layer with saccharin and / or a saccharin salt on a very flat surface with a low surface roughness, which favors the formation of a sharply defined contact zone between doctor blade and impression cylinder or pressure rollers.
- the second coating it is possible with the second coating to dispense with the formation of a base layer and a cover layer and to provide only a single and substantially homogeneous layer.
- a first coating based on a nickel-phosphorus alloy with hard material particles dispersed therein can be deposited without current on a working edge region of the doctor blade formed in a longitudinal direction of a flat and elongate base body.
- a second coating based on nickel is deposited by means of a galvanic process at least on the first coating.
- 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 hard particles dispersed therein 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.
- a first coating can be formed by the electroless deposition, which is compatible in the best possible way in particular with the second coating based on galvanic nickel to be applied in the second step.
- the working edge or optionally the entire body of the doctor blade is immersed in a suitable electrolyte bath with hard material particles suspended therein and coated in a manner known per se.
- the hard particles suspended in the electrolyte bath are incorporated into the nickel-phosphorus alloy during the coating or deposition process and are present essentially randomly distributed in the formed nickel-phosphorus alloy.
- plastics can also be used as the base body for the doctor blade and provided in a simple manner with the first coating of the nickel-phosphorus alloy.
- the galvanic process carried out in the second step can be carried out in a manner known per se.
- the areas of the doctor blade to be coated that is to say at least the working edge provided with the first coating, are immersed, for example, in a suitable galvanic electrolyte bath.
- the areas to be coated act as a cathode, while for example a soluble consumable electrode with nickel serves as the anode. It is, depending on the material to be deposited, but in principle also possible to use insoluble anodes.
- an electric current flows through the galvanic electrolyte bath, whereby elemental nickel or, for example, a nickel-phosphorus alloy is deposited on the areas of the doctor blade to be coated and forms the second coating.
- the second coatings produced by the galvanic process are pure and of high quality.
- additives can be added to the electrolyte bath to further improve the quality of the second coating, which additives may also be incorporated into the second coating.
- the galvanic deposition of a nickel-phosphorus alloy also has process engineering advantages over electroless plating.
- the phosphorus content is very easy to control and the deposits can be carried out at high deposition rates.
- the galvanic deposition of a nickel-phosphorus alloy over the galvanic deposition of nickel has the advantage that even insoluble anodes can be used.
- nickel is deposited on all sides or, for example, a nickel-phosphorus alloy, on all sides, at least on a jacket region of the base body that is in the longitudinal direction, in particular on the entire base body.
- the main body can z. B. be completely immersed in the electrolyte bath. This is not possible with the sole coating of the working surface provided with the first coating, since Under certain circumstances, the main body then has to be aligned in a complex manner with respect to the liquid surface of the electrolyte bath.
- a heat treatment is carried out to cure the first coating.
- the heat treatment induces solid state reactions in the nickel-phosphorus alloys which increase the hardness of the nickel-phosphorus alloys. Since the heat treatment takes place only after the deposition or the application of the second coating, in particular an oxide formation on the surface of the first coating is prevented. On the one hand, this entails a high adhesion between the first coating and the second coating, and on the other hand the uniformity of the doctor in the area of the working edge is improved overall.
- the coated base body is heated to a temperature of 100-500 ° C, particularly preferably to a temperature of 170-300 ° C.
- these temperatures are held for a holding time of 0.5 to 15 hours, preferably 0.5 to 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. In this case, however, very long and mostly uneconomical holding times are required. Higher temperatures than 500 ° C, depending on the material of the body, in principle also feasible, but the curing process of the nickel-phosphorus alloy is more difficult to control.
- a base layer of nickel at a pH of less than 1.5, in particular at a pH of less than 1, and then it is preferred to deposit a covering layer of nickel using saccharin at a pH of 2-5, in particular at a pH of 3.4-3.9.
- the surface of the working edge to be coated or the surface of the base body is chemically activated and the base layer forms an extremely stable adhesive bond with the working edge or the base body.
- the base layer forms an optimal base for the covering layer to be deposited over it. Maintaining a pH of 2-5 and the use of saccharin provide an optimal topcoat with a smooth and even surface.
- the base layer and the outer layer can also be deposited under other conditions.
- a slat blade 1 according to the invention is shown in cross-section.
- the lamella blade 1 includes a base body 11 made of steel, which on the in Fig. 1 left Side has a rear portion 12 having a substantially rectangular cross-section.
- a squeegee thickness, measured in from the top side 12.1 to the bottom side 12.2 of the rear area, is about 0.2 mm.
- a length of the base body 11 or the lamella blade 1 measured perpendicular to the plane of the sheet is, for example, 1000 mm.
- FIG. 1 On the in Fig. 1 right side of the base body 11 is tapered to form a working edge 13 of the top 12.1 of the rear portion 12 ago stepwise.
- An upper side 13.1 of the working edge 13 lies on a plane below the plane of the upper side 12 of the rear region 12, but is essentially parallel or plane-parallel to the upper side 12. 1 of the rear region 12.
- Between the rear portion 12 and the working edge 13 is a concave shaped transition region 12.5 before.
- the bottom 12.2 of the rear portion 12 and the bottom 13.2 of the working edge 13 lie in a common plane, which is plane-parallel to the top 12.1 of the rear portion 12 and plane parallel to the top 13.1 of the working edge 13 is formed.
- a width of the main body 11, measured from the left end of the rear area to the end face 14 of the working edge 13 measures, for example, 40 mm.
- a thickness of the working area 13, measured from the upper side 13.1 to the lower side 13.2 of the working area, is for example 0.060-0.150 mm, which corresponds to approximately half the thickness of the squeegee in the rear area 12.
- a width of the working area 13, measured at the top 13.1 of the working area 13 from the end face 14 to the transition area 12.5, is for example 0.8-5 mm.
- a free end face 14 of the right-hand free end of the working edge 13 extends from the top 13.1 of the working edge obliquely to the bottom left to the bottom 13.2 of the working edge 13 out.
- the end face 14 has an angle of approximately 45 ° or 135 ° with respect to the upper side 13.1 of the working edge 13 or with respect to the lower side 13.2 of the working edge 13.
- An upper transition region between the upper side 13.1 and the end face 14 of the working edge 13 is rounded.
- a lower transition region between the end face 14 and the bottom 13.2 of the working edge 13 is rounded.
- the working edge 13 of the lamella blade 1 is further surrounded by a first coating 20.
- the first coating 20 covers the upper side 13.1 of the Working edge 13, the transition region 12.5 and a subsequent to this subsection of the top 12.1 of the rear portion 12 of the body completely.
- the first coating 20 covers the end face 14, the underside 13.2 of the working edge 13 and a subregion of the underside 12.2 of the rear region 12 of the base body 11 adjoining the underside of the working edge 13.
- the first coating 20 is z. B. from a nickel-phosphorus alloy with a phosphorus content of 9 wt .-%.
- hard material particles 20.1 are dispersed from silicon carbide (SiC).
- the volume fraction of the hard material particles 20.1 is for example 16% and an average particle size of the hard material particles 20.1 is about 0.4 ⁇ m.
- the layer thickness of the first coating 20 measures in the region of the working edge 13 z. B. 15 microns, while the hardness z. B. 1200 HV. In the area of the upper side 12. 1 and the lower side 12. 2 of the rear area 12, the layer thickness of the first coating 20 decreases continuously, so that the first coating 20 ends in a wedge shape in a direction away from the working edge 13.
- the first coating 20 and the remaining regions of the main body 11, which are not covered by the first coating 20, are completely surrounded by a second coating 21.
- the top 12.1 and the bottom 12.2 of the rear portion 12 and the rear end face of the main body 11 with the second coating 21 are covered.
- the lateral region of the main body 11 with respect to the longitudinal direction of the main body 11 or of the doctor blade 1 perpendicular to the plane of the page is thus completely and completely surrounded by at least one of the two coatings 20, 21.
- the plane parallel to the leaf level and in Fig. 1 invisible front and rear side surfaces of the base body 11 may also be covered with the second coating 21.
- the second coating 21 consists of a base layer 21.1, which consists of electrodeposited pure nickel and has a layer thickness of about 0.5 microns. Over the base layer 21.1 a cover layer 21.2 is arranged.
- the cover layer 21.2 also consists of an electrodeposited pure nickel, but which is additionally mixed with saccharin.
- Fig. 2 is a method 100 for producing a lamellar blade, as z.
- Fig. 1 is shown, shown schematically.
- the working edge 13 of the base body 11 to be coated with the nickel-phosphorus alloy or the first coating 20 is immersed, for example, in a suitable and known aqueous electrolyte bath with hard material particles 20.1 suspended therein, wherein nickel ions consist of a nickel salt , z.
- nickel sulfate by a reducing agent, for.
- a second step 102 z For example, first a first galvanic electrolyte bath on an aqueous basis with nickel chloride and hydrochloric acid at a pH of about 1 presented. Subsequently, the base body 11 with the first coating 20 already applied in the first step is completely immersed in the electrolyte bath in a manner known per se with externally supplied electrical current, a base layer 21.1 of the second coating 21 is deposited. Subsequently, in a second galvanic electrolyte bath on an aqueous basis with nickel, nickel sulfate, nickel chloride, boric acid and saccharin, a covering layer 21.1 is deposited in a manner known per se at a pH of 3.7.
- a third step 103 the base body 11 provided with the first coating 20 and the second coating 21 is subjected to a heat treatment during, for example, two hours and at a temperature of 300 ° C. Finally, the finished lamellae 1 is cooled and ready for use.
- Fig. 1 lamella blade 1 shown a very high wear resistance and stability over the entire life.
- an identical body was as in the lamellae 1 off Fig. 1 provided in a first comparative experiment only with a first coating 20 and dispensed with the attachment of a second coating.
- an identical base body as in the lamellae blade 1 was made Fig. 1 only with a second coating 21 provided with a comparable with the first coating from the first test layer thickness, but was dispensed with the attachment of a first coating.
- Both lamellar blades produced for the test tests showed 1 compared to the lamellar blade Fig. 1 lower wear resistance or life on.
- the main body 11 in Fig. 1 also from another material, such. As stainless steel or carbon steel, be made. In this case, it may be advantageous for economic reasons to attach the second coating 21 only in the region of the working edge 13 in order to reduce the material consumption in the coating.
- the base body 11 but also made of a non-metallic material such. As plastics exist. This may be advantageous in particular for applications in flexographic printing.
- the base body 11 from Fig. 1 may have a wedge-shaped working edge or a non-tapered cross-section with a rounded working edge.
- the free end face 14 of the right-hand free end of the working edge 13 may for example also be formed completely rounded.
- inventive doctor blade Fig. 1 also be different dimensions.
- the thickness of the working area 13, measured from the Top 13.1 to the bottom 13.2 of the work area varying in a range of 0.040 - 0.200 mm.
- the first coating 20 of Fig. 1 other alloying components and / or additional substances, such.
- metal atoms non-metal atoms, inorganic compounds and / or organic compounds.
- hard material particles of silicon carbide SiC
- other hard material particles may also be present.
- a galvanically deposited nickel-phosphorus alloy instead of electrodeposited pure nickel for the second coating 21, wherein a phosphorus content is preferably 12-15%.
- a phosphorus content is preferably 12-15%.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Printing Plates And Materials Therefor (AREA)
- Rotary Presses (AREA)
- Electroplating Methods And Accessories (AREA)
- Chemically Coating (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL09817159T PL2328754T3 (pl) | 2008-09-30 | 2009-08-27 | Rakiel |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH01546/08A CH699600A1 (de) | 2008-09-30 | 2008-09-30 | Rakel. |
PCT/CH2009/000289 WO2010037240A1 (de) | 2008-09-30 | 2009-08-27 | Rakel |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2328754A1 EP2328754A1 (de) | 2011-06-08 |
EP2328754B1 true EP2328754B1 (de) | 2012-07-04 |
Family
ID=40316997
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP09817159A Active EP2328754B1 (de) | 2008-09-30 | 2009-08-27 | Rakel |
Country Status (11)
Country | Link |
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US (1) | US9044927B2 (es) |
EP (1) | EP2328754B1 (es) |
JP (1) | JP5444356B2 (es) |
CN (1) | CN102256794B (es) |
BR (1) | BRPI0920819B1 (es) |
CH (1) | CH699600A1 (es) |
DK (1) | DK2328754T3 (es) |
ES (1) | ES2390260T3 (es) |
MX (1) | MX343224B (es) |
PL (1) | PL2328754T3 (es) |
WO (1) | WO2010037240A1 (es) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DK2525984T3 (en) * | 2010-01-20 | 2016-06-27 | Daetwyler Swisstec Ag | Rakel |
KR20210087049A (ko) * | 2018-11-29 | 2021-07-09 | 교세라 가부시키가이샤 | 피복 공구 및 그것을 구비한 절삭 공구 |
GB2582635B (en) * | 2019-03-28 | 2021-12-29 | Archipelago Tech Group Ltd | Device, method, and assembly for loading nozzles with fluid |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3401097A (en) * | 1964-12-08 | 1968-09-10 | Metalux Corp | Electrodeposition of nickel |
US3506548A (en) * | 1966-09-23 | 1970-04-14 | Allied Res Prod Inc | Electrodeposition of nickel |
US3940319A (en) * | 1974-06-24 | 1976-02-24 | Nasglo International Corporation | Electrodeposition of bright tin-nickel alloy |
GB1524748A (en) * | 1976-05-28 | 1978-09-13 | Inco Europ Ltd | Production of hard heat-resistant nickel-base electrodeposits |
DE3110842A1 (de) * | 1981-03-20 | 1982-09-30 | Basf Ag, 6700 Ludwigshafen | Rakel fuer den tiefdruck mit kunststoff-druckschichten |
JP2952333B2 (ja) | 1990-07-03 | 1999-09-27 | 大日本印刷株式会社 | ドクター刃の製造方法 |
US5947021A (en) * | 1997-11-04 | 1999-09-07 | Photo Stencil, Inc. | Metal squeegee blade with a titanium nitride coating |
JP3279303B2 (ja) * | 2000-02-09 | 2002-04-30 | 株式会社野村鍍金 | クロムめっきされた樹脂ローラー及びその製造方法 |
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 |
JP4282936B2 (ja) * | 2002-02-04 | 2009-06-24 | 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 |
EP1868813A2 (en) | 2005-04-15 | 2007-12-26 | Nihon New Chrome Co. Ltd. | Surface-treated doctor blade |
EP1745862A1 (en) * | 2005-07-21 | 2007-01-24 | C.B.G. Acciai S.r.l. | Doctor blade coated with a polymeric material, designed to operate in combination with a printing cylinder |
CN101235500B (zh) | 2007-02-02 | 2010-08-25 | 比亚迪股份有限公司 | 一种带镀层的壳体的制备方法 |
-
2008
- 2008-09-30 CH CH01546/08A patent/CH699600A1/de not_active Application Discontinuation
-
2009
- 2009-08-27 CN CN200980148792.4A patent/CN102256794B/zh active Active
- 2009-08-27 DK DK09817159.8T patent/DK2328754T3/da active
- 2009-08-27 EP EP09817159A patent/EP2328754B1/de active Active
- 2009-08-27 JP JP2011528155A patent/JP5444356B2/ja active Active
- 2009-08-27 MX MX2011003423A patent/MX343224B/es active IP Right Grant
- 2009-08-27 BR BRPI0920819-4A patent/BRPI0920819B1/pt active IP Right Grant
- 2009-08-27 PL PL09817159T patent/PL2328754T3/pl unknown
- 2009-08-27 WO PCT/CH2009/000289 patent/WO2010037240A1/de active Application Filing
- 2009-08-27 ES ES09817159T patent/ES2390260T3/es active Active
- 2009-08-27 US US13/121,432 patent/US9044927B2/en active Active
Also Published As
Publication number | Publication date |
---|---|
DK2328754T3 (da) | 2012-10-15 |
PL2328754T3 (pl) | 2012-11-30 |
CN102256794B (zh) | 2014-07-09 |
ES2390260T3 (es) | 2012-11-08 |
JP2012504055A (ja) | 2012-02-16 |
MX2011003423A (es) | 2011-08-03 |
CH699600A1 (de) | 2010-03-31 |
BRPI0920819B1 (pt) | 2020-01-07 |
BRPI0920819A2 (pt) | 2015-12-22 |
US9044927B2 (en) | 2015-06-02 |
CN102256794A (zh) | 2011-11-23 |
US20110219971A1 (en) | 2011-09-15 |
WO2010037240A1 (de) | 2010-04-08 |
MX343224B (es) | 2016-10-28 |
JP5444356B2 (ja) | 2014-03-19 |
EP2328754A1 (de) | 2011-06-08 |
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