AU5966386A - Wear resistant doctor blade - Google Patents
Wear resistant doctor bladeInfo
- Publication number
- AU5966386A AU5966386A AU59663/86A AU5966386A AU5966386A AU 5966386 A AU5966386 A AU 5966386A AU 59663/86 A AU59663/86 A AU 59663/86A AU 5966386 A AU5966386 A AU 5966386A AU 5966386 A AU5966386 A AU 5966386A
- Authority
- AU
- Australia
- Prior art keywords
- coating
- fact
- doctor blade
- article
- per
- 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.)
- Abandoned
Links
- 238000000576 coating method Methods 0.000 claims description 22
- 239000011248 coating agent Substances 0.000 claims description 20
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 6
- 229910052750 molybdenum Inorganic materials 0.000 claims description 6
- 239000011733 molybdenum Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 238000007790 scraping Methods 0.000 claims description 4
- 229910001182 Mo alloy Inorganic materials 0.000 claims description 3
- 238000009499 grossing Methods 0.000 claims description 3
- 229910000943 NiAl Inorganic materials 0.000 description 4
- NPXOKRUENSOPAO-UHFFFAOYSA-N Raney nickel Chemical compound [Al].[Ni] NPXOKRUENSOPAO-UHFFFAOYSA-N 0.000 description 4
- 238000010285 flame spraying Methods 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- 239000010960 cold rolled steel Substances 0.000 description 3
- 238000005524 ceramic coating Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000004580 weight loss Effects 0.000 description 2
- 229910018516 Al—O Inorganic materials 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910000760 Hardened steel Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000007750 plasma spraying Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F9/00—Rotary intaglio printing presses
- B41F9/06—Details
- B41F9/08—Wiping mechanisms
- B41F9/10—Doctors, scrapers, or like devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F9/00—Rotary intaglio printing presses
- B41F9/06—Details
- B41F9/08—Wiping mechanisms
- B41F9/10—Doctors, scrapers, or like devices
- B41F9/1072—Blade construction
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
- Coating Apparatus (AREA)
- Road Paving Machines (AREA)
- Printing Plates And Materials Therefor (AREA)
Description
WEAR RESISTANT DOCTOR BLADE
TECHNICAL FIELD The invention relates to cold rolled, heat-treated and hardened steel strip articles. More precisely the invention aims to improve the wear resistance and friction properties of such cold rolled steel strip articles which are exposed to abraison. In the first place the invention concerns coated scraper or doctor blades, for example for smoothing out a coating material on a continuous paper web or the scraping clean of rollers for creping, removal or scraping clean of surplus paint on photogravure rollers, anilax rollers and similar machine parts.
BACKGROUND OF THE INVENTION
The wearing out time for cold rolled steel strip coating scrapers is normally about. hours if the scraper is not coated with some wear or friction reducing coating. When the scraper is worn, the coating becomes faulty, and therefore the paper line must be stopped for replacement. For self-evident reasons it is desirable to increase the life of the scrapers, not in the first place in order to reduce the cost of the scrapers but in order to reduce the down times of the paper machine.
With printing press doctor blades too similar problems appear. When the doctor blade is worn, unevermesses build up at the edge, which can leave traces on the print roller with which the doctor blade is engaged. It is sufficient for these traces to have a depth of about 1 μm for coloured edges and other defects to arise on the web that is being printed by means of the roller.
It is well known that these problems can be reduced by coating the active parts of the blade, i.e. the parts that are in contact with the paper web or printing press roller along with the most closely adjacent parts of the blade with a coat of a material which has higher wear resistance than the cold rolled steel strip. For example in this
connection reference can be made to GB-A-978988 and GB-A-1 289609, which describe how printing press doctor blades can be made more wear resistant through coating with ceramic coatings.
DISCLOSURE OF THE INVENTION
The object of the invention is to offer an improved solution to the above problems. One aim is thus to improve the wear resistance and friction properties of a scraper or doctor blade in the shape of a chamfered, coated steel strip for smoothing out a coating material on a continuous paper web or for scraping rollers clean, i.e. a product which in its employment is exposed to wear which can put at risk the function of the product and/or reduce its active life. It is also an aim to reduce the energy requirement with the use of the product.
It is also an aim to offer a coating which can preferably be applied directly to the steel strip, i.e. without an intermediate coating such as is required in for example the application of ceramic coatings to steel strip.
These and other aims can be achieved through the fact that the coating consists of molybdenum or a molybdenum alloy consisting mainly of molybdenum and covering at least a part of the scraper or doctor blade's surface.
The layer thickness of the coating can vary but generally amounts to between 0.02 and 0.5 mm, which can correspond to between 10 and 100% of the thickness of the steel strip. In a normal case the coating is limited essentially only to that part of the blade or corresponding element which is exposed to wear during work, preferably the face area or face areas and/or the area up to the leading edge of the face area or face areas, in a way which in itself is conventional.
Further characteristics and aspects of the invention become clear from the patent claims below and from the following description of a preferred embodiment and from wear tests carried out.
BRIEF DESCRIPTION OF THE DRAWINGS
In the following description reference will be made to the enclosed drawings, of which
Fig. 1 shows a cross section of a printing press doctor blade which has been coated with a wearing course, and
Fig. 2 shows in diagrammic form the wear as a function of the time for different coatings.
DESCRIPTION OF PREFERRED EMBODIMENT AND TESTS CARRIED OUT
With reference first to Fig. 1 a doctor blade in general is marked with the numeral 7. The blade's dimensions are considerably increased in the drawing. It consists of a thin cold rolled strip 8 with a face area 9. The face -_rea 9 is coated with a wearing layer 10. The wearing layer also covers with a part 11 the area up to the leading edge 12 of the face area 9.
In the tests carried out the material in the doctor blades 8 consisted of a carbon steel (quality UH_r^20C) with hardness about 530 HV. The scraper blades had the following dimensions: thickness 0.38 mm, width 45 mm, length 225 mm. The scraper blades 8 were clad with the wearing layers 10 and 11 of varying composition. After coating, the coating surfaces were ground to the thicknesses which can be seen in Table 1. The table also contains information about the composition of the coating layer and the wearing down expressed as weight loss a ter 30 rain.
In the test the doctor blades were worn down against a rotating steel cylinder which had hardness 33 HRC for a total of 30 min. The weight loss of the blades was determined every fifth minute. The applied pressure against the cylinder was 1.8 bar. The cylinder speed went up to 1400 rpm.
The result can be seen from the two last columns in Table 1 and from the diagrams in Figure 2. Far the best result was obtained with the molybdenum coated doctor blade according to the invention. Expressed in relative wear resistance this was nearly 10 times better than the next best.
TABLE 1
Sample Coating Method Thickness(mm) Wear(mg) Rela-
No. Side Face after tive graph area 30 min wear resis¬ tance
1. NiAl+ZrO /MgO Flame spraying 0.080 0.068 0.090 0.07 of powder
2. NiAl+Cr 0_ Flame spraying 0.068 0.045 0.093 0.07
23 of rod
3. NiAl+Al-O./TiO Flame spraying 0.113 0.045 0.056 0.11 of powder
4. NiAl+Cr 0_ Plasma spraying 0.090 0.045 0.046 0.13
5. Mo Flame spraying 0.068 0.068 0.006 1.0 of wire
6. None - 0.090 0.07
It can be seen that the improved wear resistance can be utilised to prolong the effective life of paper machine scrapers, so that the interval between scraper replacements can be very considerably extended. In addition the lower friction results in a reduced output requirement significantly so as to decrease the investment and operating costs.
Claims (6)
1. Scraper or doctor blade (7) in the shape of a chamfered, coated steel strip (8) for smoothing out a coating material on a continuous paper web or for scraping rollers clean, c h a r a c t e r i s e d by the fact that at least a part (9) of its surface has a covering coating (10,11) of molybdenum or a molybdenum alloy consisting mainly of molybdenum.
2. Article as per claim 1, c h a r a c t e r i z e d by the fact that the coating has a thickness of 0.02-0.05 mm.
3. Article as per claim 2, c h a r a c t e r i z e d by the fact that the coating has a thickness of between 10 and 100% of the thickness of the scraper or doctor blade.
4. Article as per any of the claims 1-3, c h a r a c t e r i s e d by the fact that the said coating of molybdenum or molybdenum alloy is applied directly to the steel without a binding layer.
5. Article as per any of the claims 1-4, c h a r a c t e r i s e d by the fact that the coating essentially is limited to that part (9) of the blade (8) which is exposed in work to wear, preferably the face area or face areas and/or the area up to the leading edge of the face area or face areas (12).
6. Article as per any of the claims 1-5, c h a r a c t e r i s e d by the fact that its thickness is 0.05-3.5 raa.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8502954 | 1985-06-14 | ||
SE8502954A SE447362B (en) | 1985-06-14 | 1985-06-14 | doctor blade |
Publications (1)
Publication Number | Publication Date |
---|---|
AU5966386A true AU5966386A (en) | 1987-01-07 |
Family
ID=20360573
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AU59663/86A Abandoned AU5966386A (en) | 1985-06-14 | 1986-06-06 | Wear resistant doctor blade |
Country Status (9)
Country | Link |
---|---|
EP (1) | EP0262137B1 (en) |
JP (1) | JPS62503085A (en) |
KR (1) | KR870700515A (en) |
AU (1) | AU5966386A (en) |
BR (1) | BR8607112A (en) |
DE (1) | DE3671193D1 (en) |
FI (1) | FI875167A (en) |
SE (1) | SE447362B (en) |
WO (1) | WO1986007309A1 (en) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DK0728579T3 (en) * | 1995-02-27 | 1999-03-22 | Rolf Meyer | Rack for gravure rotary machines and method and apparatus for its manufacture |
DE19509741A1 (en) * | 1995-03-17 | 1996-09-19 | Roland Man Druckmasch | Printing machine roller, in particular ink roller |
FR2733720B1 (en) * | 1995-05-05 | 1997-07-25 | Heidelberg Harris Sa | ROTARY BLADE OF OFFSET PRINTING MACHINE |
FR2740386B1 (en) * | 1995-10-26 | 1998-01-16 | Heidelberg Harris Sa | INK BLADE SUBDIVIDED INTO ZONES FOR A ROTARY PRINTING MACHINE |
SE506563C2 (en) * | 1996-05-02 | 1998-01-12 | Btg Eclepens Sa | crepe |
US5753076A (en) * | 1997-02-03 | 1998-05-19 | Kimberly-Clark Worldwide, Inc. | Method for creping tissue |
ES2171808T3 (en) | 1997-10-24 | 2002-09-16 | Daetwyler Ag | SCRAPER TO ELIMINATE THE EXCESS OF PRINTING INK FROM THE SURFACE OF A PRINT PLATE. |
FI111343B (en) | 1998-06-09 | 2003-07-15 | Metso Paper Inc | Scraper blade and blade holder |
SE0000215L (en) | 2000-01-25 | 2001-07-26 | Btg Eclepens Sa | Rakelknive |
SE519466C2 (en) | 2000-12-07 | 2003-03-04 | Swedev Ab | Schaber or razor blade with nickel coating including abrasion-resistant particles and method of manufacture |
US6546861B2 (en) | 2001-07-30 | 2003-04-15 | Goss Graphic Systems, Inc. | Printing press scraping blade |
KR20030033562A (en) * | 2001-10-24 | 2003-05-01 | 김창준 | Doctor blade |
DE10222453A1 (en) * | 2002-05-22 | 2003-12-04 | Voith Paper Patent Gmbh | Process for the surface treatment of a doctor element |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ZA703701B (en) * | 1969-06-16 | 1971-01-27 | Norton Co | Doctor blade |
US3688336A (en) * | 1970-07-16 | 1972-09-05 | Lodding Engineering Corp | Extended-life doctoring apparatus |
US3703019A (en) * | 1970-10-15 | 1972-11-21 | Norton Co | Surface conforming wear resistant doctor blade for rolls |
SU850750A1 (en) * | 1979-07-24 | 1981-07-30 | Ленинградский Технологическийинститут Целлюлозно-Бумажнойпромышленности | Electrolyte for precipitating molybdenum platings |
DE3110842A1 (en) * | 1981-03-20 | 1982-09-30 | Basf Ag, 6700 Ludwigshafen | Squeegee for gravure printing with plastic printing layers |
SE437683B (en) * | 1982-10-13 | 1985-03-11 | Inventing Ab | CREATE OR SHELL - MATERIAL AGAINST THE ROLL - BY EXV |
SE437681B (en) * | 1982-10-13 | 1985-03-11 | Inventing Ab | CREATIVE OR RABLE FOR CONTROLLABLE PAIRING AND EXTRAORDINATION OF APPLIANCES ON A CURRENT PAPER COAT |
-
1985
- 1985-06-14 SE SE8502954A patent/SE447362B/en not_active IP Right Cessation
-
1986
- 1986-06-06 BR BR8607112A patent/BR8607112A/en unknown
- 1986-06-06 DE DE8686903685T patent/DE3671193D1/en not_active Expired - Fee Related
- 1986-06-06 AU AU59663/86A patent/AU5966386A/en not_active Abandoned
- 1986-06-06 JP JP61503333A patent/JPS62503085A/en active Pending
- 1986-06-06 EP EP86903685A patent/EP0262137B1/en not_active Expired - Lifetime
- 1986-06-06 WO PCT/SE1986/000265 patent/WO1986007309A1/en active IP Right Grant
-
1987
- 1987-01-30 KR KR870700080A patent/KR870700515A/en not_active Application Discontinuation
- 1987-11-23 FI FI875167A patent/FI875167A/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
SE8502954D0 (en) | 1985-06-14 |
KR870700515A (en) | 1987-12-29 |
EP0262137B1 (en) | 1990-05-16 |
DE3671193D1 (en) | 1990-06-21 |
EP0262137A1 (en) | 1988-04-06 |
SE447362B (en) | 1986-11-10 |
FI875167A0 (en) | 1987-11-23 |
BR8607112A (en) | 1988-02-23 |
FI875167A (en) | 1987-11-23 |
JPS62503085A (en) | 1987-12-10 |
WO1986007309A1 (en) | 1986-12-18 |
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