EP2729615A2 - Schmutzabweisender putzschaber - Google Patents
Schmutzabweisender putzschaberInfo
- Publication number
- EP2729615A2 EP2729615A2 EP12731003.5A EP12731003A EP2729615A2 EP 2729615 A2 EP2729615 A2 EP 2729615A2 EP 12731003 A EP12731003 A EP 12731003A EP 2729615 A2 EP2729615 A2 EP 2729615A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- coating layer
- cleaning scraper
- coating
- polymer
- cleaning
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G3/00—Doctors
- D21G3/005—Doctor knifes
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G3/00—Doctors
Definitions
- the invention relates to doctor blade scrapers for papermaking machines and, more particularly, to the formation of scrapers for cleaning roll surfaces in papermaking.
- Cleaning scrapers are used on paper machines to clean the surfaces of rolls.
- the cleaning of a roll surface is carried out by detaching the contaminants by means of one or more plaster doctor blades pressing against the surface of the respective cover of the roll.
- the impurities usually formed by paper remnants, paper fibers and particles lead to local load peaks on the blades, so that scrapers are usually made of steel or under corrosive conditions made of stainless steel to achieve a longer service life or runtime and provided for contact with the roller Area have a hard metal coating.
- a commercially available hard metal powder with z. B. 8-10% cobalt and tungsten monocarbide are used as hard material.
- the coating is preferably carried out using thermal spray techniques, the
- Coating material is often applied in several strokes to one, based on their composition and physical properties, as homogeneous as possible
- the coating surface has a certain adhesion to the detached from the roll cover impurities, whereby the dirt particles are dissipated with progressively lower efficiency of cleaning scraper and the cleaning effect of the cleaning scraper is affected over time.
- such a cleaning scraper for cleaning roll surfaces in paper machines has a base body and a coating covering at least part of the surface of the base body.
- the coating comprises a first metallic coating layer and a second coating layer arranged on the first coating layer, wherein the second coating layer is formed by a polymer.
- a cleaning scraper according to this embodiment presses against the respective roll surface with the second coating layer formed by a polymer. Since the adhesion of impurities to the polymer is lower than that on the metallic coating layer, improved removal of the impurities removed from the roll surface and thus an improved removal of the impurities is achieved
- the terms used in this specification and the claims for listing features include “comprise,” “comprise,” “include,” “contain,” and “with,” as well as their grammatical modifications, generally non-exhaustive of Characteristics, such. Components, procedures, facilities, areas, sizes, and the like, and in no way excludes the presence of other or additional features or groupings of other or additional features.
- the polymer comprises an epoxy resin, since this wets the metallic first coating material in the non-crosslinked or partially crosslinked state well and thus adheres well to this.
- the polymer advantageously comprises a silicone-polyester resin, as it combines an excellent stain-resistant effect with very good non-stick and sliding properties.
- fillers may be embedded in the polymer, the fillers in preferred embodiments thereof including polyfluoroethylene (PFE) and in particular
- the fillers are present in the form of particles and in particular in the form of particles with average diameters in the range of 0.1 to 5 ⁇ m.
- the polymer may also be formed directly from polyfluoroethylene and in particular polytetrafluoroethylene or from a polymer comprising such a substance.
- the material of the first coating layer in embodiments comprises a cemented carbide which combines good mechanical resistance with high abrasion resistance and can be effectively and economically applied to the body of the cleaning tool by modern thermal spraying methods.
- the cemented carbide preferably has 8 to 10% cobalt in embodiments and contains tungsten monocarbide as hard material.
- Other embodiments have a first coating layer whose material comprises an oxide ceramic.
- the oxide ceramics or oxide ceramics of the first coating layer are preferably under alumina, zirconium oxide,
- Magnesium oxide, chromium (III) oxide, yttria and titanates Magnesium oxide, chromium (III) oxide, yttria and titanates.
- the first coating layer at the boundary to the second coating layer preferably has a surface roughness in the range of 5 to 8 ⁇ m and in particular in the range of 6 to 7 ⁇ m.
- an adhesive layer is disposed on the surface region of the base body, which adjoins the first coating layer, which improves the adhesion of the first coating layer to the base body.
- the layer thickness of the first coating layer preferably has a value in the range of about 50 to 100 ⁇ m
- the second coating layer preferably has a value in the range of about 20 to 80 ⁇ m.
- FIG. 1 shows a schematic cross section through a cleaning scraper in the region around the latter.
- the schematic representation of Figure 1 shows a cross section through the provided for application to a roll surface front portion of a provided with a coating Putschabers 10.
- the cleaning blade 10 has a base body 11, which may be formed of steel, for example, preferably made of stainless steel, and a coating composed of a first coating layer 12 and a second coating layer 13 disposed thereon.
- the base body 11 At the interface to the first coating layer 12, the base body 11, as illustrated in the figure, have an adhesion-promoting layer 14.
- the coating occupies at least the part of the cleaning scraper 10 which comes into contact with the roll surface of the paper machine.
- the scraper 10 also has a chamfer in the front surface provided for contact with a roller surface, which is generally referred to as a wate.
- the coating covers the main body 11 as shown in the figure in the area of the wate.
- the coating has two coating layers 12 and 13, the first coating layer 12 arranged on the main body preferably being formed by a metallic material, which expediently consists of a hard metal or such includes.
- Coating layer 13 is a polymer.
- a thermal spraying process is used to produce the first coating layer 12.
- the spray coating is preferably carried out in several strokes, for example with 10 to 100 strokes. Each stroke produces a thin partial layer of the coating material, the first partial layer being sprayed directly onto the surface of the main body 11 or the adhesion promoter layer 14 previously applied thereto, and further partial layers are sprayed onto the respectively previously applied partial layer.
- the physical homogeneity of the first coating layer 12 can be adjusted via the parameters of the method used.
- HVOF High Velocity Oxygen Fuel
- the formation of pores in the partial layers can be avoided by choosing a suitable ratio of fuel to oxygen and a suitable delivery rate of the powder material used for layer formation.
- the cemented carbide powder is preferably applied so as to obtain a surface roughness of the first coating layer 12 in the range of about 5 to 8 ⁇ m and in particular in the range of 6 to 7 ⁇ m.
- the coating is preferably applied only to a part of the base body and covered in preferred embodiments in an approximately 20 mm wide area, which adjoins the front edge of the cleaning scraper and covers the Wate.
- ceramic materials such as.
- These can also be applied to the base body of the cleaning doctor blade 10 by means of thermal spraying methods.
- the adhesion of ceramic coatings to the base body 11 in the case of steel substrates is usually ensured by the use of a bonding agent layer whose material can be selected, for example, from aluminum, nickel, chromium or alloys such as AINi or NiCr.
- a polymer is applied as a second coating layer 13 on the surface thereof.
- the polymer fills in the depressions given by the surface roughness of the first coating layer 12, as a result of which, in addition to a material bond, a positive connection of the two coating layers also results.
- Suitable polymers are thermosets and thermoplastics, which can be prepared on the basis of one-component and two-component systems. Particularly suitable are thermosets whose decomposition temperature is so far above the operating temperature of the second coating layer 13 that the thermoset behaves elastically. In an analogous manner, thermoplastics whose glass transition temperature is so far above the operating temperature of the second coating layer 13, that when using the coated with the polymer cleaning scraper 10 no disturbing softening of the polymer may occur. As a rough guideline for the minimum difference between operating temperature and decomposition or glass transition temperature 20 ° C can be specified. Under use temperature is the Operating temperature of the second coating layer 13 during the intended use of the cleaning scraper blade 10 to understand.
- Particularly suitable polymers are epoxy resins and epoxy resins with filler particles embedded therein, for example of a polyfluoroethylene (PFE) and in particular of polytetrafluoroethylene (PTFE). Since epoxy resin shows a good wetting of the first coating layer 12 in the non-crosslinked or partially crosslinked state, it has good adhesion to it.
- PFE polyfluoroethylene
- PTFE polytetrafluoroethylene
- the viscosity of the epoxy resin can be reduced by adding solvents such as alcohols or ketones, for example to allow the polymer to be sprayed on.
- solvents such as alcohols or ketones
- application of the polymer by means of brushing tools, e.g. As brushing or filling preferably.
- brushing tools e.g. As brushing or filling preferably.
- the coating of the surface of the first coating layer can also be done by immersion in a still liquid polymer.
- the polymer starting material used is a mixture of epoxy resin and isobutanol containing PTFE particles with mean diameters of 0.1 to 5 ⁇ m.
- the proportions of the epoxy resin in the polymer starting material are between 40 and 70 wt .-%, that of isobutanol between 10 and 60 wt .-% and that of the PTFE particles between 2 and 20% wt .-%.
- the polymer / solvent mixture is preferably sprayed onto the first coating layer.
- Another preferred embodiment differs from the one described above in the choice of starting polymer material using an isobutanol mixed silicone-polyester resin containing PTFE. Contains particles with average sizes of 0.1 to 5 ym. The proportions of the silicone-polyester resin on
- Polymer starting material are again between 40 and 70 wt .-%, that of isobutanol between 10 and 60 wt .-% and that of the PTFE particles between 2 and 20% wt .-%.
- the polymer / solvent mixture is preferably sprayed onto the first coating layer.
- the polymer base material After the application of the polymer base material to the first coating layer 12, it is preferably thermally crosslinked, whereby the formation of the polymeric second coating layer 13 is completed.
- silicones may also be used to form the second coating layer 13.
- Low viscosity polymer starting materials are preferably used to form relatively thin second coating layers, for example, for thicknesses from 20 to about 50 ⁇ m, higher viscosity polymer starting materials for correspondingly thicker second
- Coating layers of, for example, up to 80 ym.
- the adhesion of contaminants on the scraper is reduced, so that they can be more easily removed from the scraper blade 10 and do not accumulate there.
- the cleaning effect of the cleaning scraper 10 is significantly improved over conventional designs.
- the polymeric surface also reduces the friction to the roll surface, the improved cleaning effect is maintained over a longer period of time. Due to the different optical properties of the first and second coating layer can also damage the Coating or marked by wear of the second coating layer term of the cleaning scraper easier and faster than conventional scrapers.
Landscapes
- Paper (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102011078745A DE102011078745A1 (de) | 2011-07-06 | 2011-07-06 | Schmutzabweisender putzschaber |
| PCT/EP2012/062993 WO2013004729A2 (de) | 2011-07-06 | 2012-07-04 | Schmutzabweisender putzschaber |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP2729615A2 true EP2729615A2 (de) | 2014-05-14 |
| EP2729615B1 EP2729615B1 (de) | 2015-05-20 |
| EP2729615B2 EP2729615B2 (de) | 2018-07-04 |
Family
ID=46420231
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP12731003.5A Active EP2729615B2 (de) | 2011-07-06 | 2012-07-04 | Schmutzabweisender putzschaber |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20140137361A1 (de) |
| EP (1) | EP2729615B2 (de) |
| CN (1) | CN103649412A (de) |
| DE (1) | DE102011078745A1 (de) |
| WO (1) | WO2013004729A2 (de) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102014205614A1 (de) | 2014-03-26 | 2015-05-21 | Voith Patent Gmbh | Streichmesser |
| EP3225736A1 (de) * | 2016-03-31 | 2017-10-04 | BTG Eclépens S.A. | Maskierte streichklinge |
| CN105835921B (zh) * | 2016-05-25 | 2017-12-12 | 温岭市创嘉信息科技有限公司 | 一种防污食品运输车 |
| CN110170436A (zh) * | 2019-06-17 | 2019-08-27 | 晋江市兰欣新材料科技有限公司 | 一种用于石辊辊面的耐磨涂层及其制备方法 |
Family Cites Families (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU485283B2 (en) * | 1971-05-18 | 1974-10-03 | Warner-Lambert Company | Method of making a razorblade |
| SE437681B (sv) † | 1982-10-13 | 1985-03-11 | Inventing Ab | Schaber eller rakel for kontrollerbar paforing och utjemning av bestrykningsmedel pa en lopande pappersbana |
| SE437683B (sv) † | 1982-10-13 | 1985-03-11 | Inventing Ab | Schaber eller rakel - anliggande mot valsen - vid exv tryck-, ferg-, eller kreppning |
| JPH0887196A (ja) * | 1994-09-19 | 1996-04-02 | Canon Inc | 定着装置 |
| DE69636376T2 (de) * | 1995-05-31 | 2007-07-26 | Canon K.K. | Elastische Schneide um Entwicklerzufuhr zu Steuern, und diese benutzendes Entwicklungsgerät |
| JP3443519B2 (ja) * | 1996-09-30 | 2003-09-02 | 京セラ株式会社 | ブレード |
| FI111343B (fi) * | 1998-06-09 | 2003-07-15 | Metso Paper Inc | Kaavinterä ja terän pidin |
| FI112877B (fi) * | 1998-09-10 | 2004-01-30 | Metso Paper Inc | Kaavarinterä |
| FI105351B (fi) | 1999-02-15 | 2000-07-31 | Valmet Corp | Menetelmä kuluvan pinnan tiivistämiseksi |
| US6867155B2 (en) * | 1999-10-15 | 2005-03-15 | Kadant Web Systems, Inc. | Non-abrasive composite doctor blade |
| US6684513B1 (en) * | 2000-02-29 | 2004-02-03 | The Gillette Company | Razor blade technology |
| US6643890B2 (en) * | 2000-12-01 | 2003-11-11 | S. D. Warren Services Company | Composite doctor blades |
| 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 |
| US6565712B2 (en) * | 2001-05-17 | 2003-05-20 | Lingol Corporation | Composite |
| FI5084U1 (fi) † | 2001-06-15 | 2001-09-28 | Metso Paper Inc | Järjestely paperi- tai kartonkikoneen hihnan tai pehmeän telapinnoitteen kaapimiseksi |
| US7152526B2 (en) * | 2002-01-29 | 2006-12-26 | Nihon New Chrome Co., Ltd. | Surface treated doctor blade |
| SE524103C2 (sv) † | 2002-07-15 | 2004-06-29 | Btg Eclepens Sa | Bestrykningsblad och förfarande för framställning av detta |
| SE0403178D0 (sv) † | 2004-12-28 | 2004-12-28 | Btg Eclepens Sa | Method of manufacturing a coating or doctoring blade |
| WO2008025172A1 (en) * | 2006-08-29 | 2008-03-06 | Daetwyler Swiss Tec Ag | Doctor blade |
| DE102008000830A1 (de) † | 2008-03-26 | 2009-10-01 | Voith Patent Gmbh | Verfahren zum Beschichten einer Klinge, mittels dem Verfahren beschichtete Klinge sowie Vorrichtung zum Beschichten |
| FI120458B (fi) * | 2008-06-27 | 2009-10-30 | Metso Paper Inc | Rainanmuodostuskoneen terä |
| DE102009029698A1 (de) * | 2009-09-23 | 2011-03-24 | Voith Patent Gmbh | Klingenbeschichtung |
-
2011
- 2011-07-06 DE DE102011078745A patent/DE102011078745A1/de not_active Withdrawn
-
2012
- 2012-07-04 US US14/130,803 patent/US20140137361A1/en not_active Abandoned
- 2012-07-04 WO PCT/EP2012/062993 patent/WO2013004729A2/de not_active Ceased
- 2012-07-04 CN CN201280033600.7A patent/CN103649412A/zh active Pending
- 2012-07-04 EP EP12731003.5A patent/EP2729615B2/de active Active
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2013004729A2 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2013004729A2 (de) | 2013-01-10 |
| WO2013004729A3 (de) | 2013-06-20 |
| DE102011078745A1 (de) | 2013-01-10 |
| EP2729615B1 (de) | 2015-05-20 |
| US20140137361A1 (en) | 2014-05-22 |
| CN103649412A (zh) | 2014-03-19 |
| EP2729615B2 (de) | 2018-07-04 |
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