EP2651632A1 - Revêtement de lame imprégné - Google Patents

Revêtement de lame imprégné

Info

Publication number
EP2651632A1
EP2651632A1 EP11787852.0A EP11787852A EP2651632A1 EP 2651632 A1 EP2651632 A1 EP 2651632A1 EP 11787852 A EP11787852 A EP 11787852A EP 2651632 A1 EP2651632 A1 EP 2651632A1
Authority
EP
European Patent Office
Prior art keywords
coating
blade
blade according
polymer
open
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP11787852.0A
Other languages
German (de)
English (en)
Other versions
EP2651632B1 (fr
Inventor
Jürgen ANGERLER
Alexander Etschmaier
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.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=45033969&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP2651632(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP2651632A1 publication Critical patent/EP2651632A1/fr
Application granted granted Critical
Publication of EP2651632B1 publication Critical patent/EP2651632B1/fr
Revoked legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G3/00—Doctors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
    • B31F1/12—Crêping
    • B31F1/14—Crêping by doctor blades arranged crosswise to the web
    • B31F1/145—Blade constructions
    • 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
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/08—Rearranging applied substances, e.g. metering, smoothing; Removing excess material
    • D21H25/10—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with blades
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/32—Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper

Definitions

  • the invention relates to blades for papermaking machines and, more particularly, to the formation of blades for use in creping or scraping a paper web.
  • Nonwoven web the so-called raw paper web
  • raw paper web are usually subjected to a separate treatment.
  • high-quality paper grades are deleted, hygiene papers are creped.
  • the creping process produces paper types with surface textures.
  • a blade usually referred to as a creping doctor
  • the creping doctor has a run-on surface arranged close to its working edge, on which the paper web is jammed upon impact and is thereby structured.
  • To smooth the paper web surface is painted on this usually pasty line layer of pigments, binders and excipients.
  • the coating of the paper web can be done in a separate operation, but is usually integrated into the papermaking process by incorporating a coating into the paper machine.
  • creping knives and doctor blades are usually provided with a coating which has a higher wear resistance or a lower wear rate than the base material of the blade.
  • Such coatings are mostly made of an abrasion resistant material using metal oxides or cemented carbides in which a metal carbide is embedded in a cobalt, nickel or iron matrix.
  • thermal spraying techniques are used, wherein the coating material is often applied in several strokes. Each of the strokes applies a thin layer of coating material to the base material of the blade or to the coating layer applied last thereon. The application of the coating in several thin layers ensures that the components of the coating material can not segregate during the construction of the coating. While maintaining the
  • Coating parameters can thus be generated due to the chemical and physical identity of the individual layers, a macroscopically homogeneous coating. Nevertheless, the wear behavior of these coatings allows for the prevailing during operation Conditions do not require a long service life, so that creping doctor and doctor blade to maintain the paper quality still need to be changed in very short intervals. Particles and contaminants on and within the paper webs also result in localized load peaks on the blades, and on the blade coatings on a regular basis. Damage, which reduces the quality of the paper produced.
  • the nonwoven web handling blade comprises a base body and a coating covering at least a portion of the surface of the body, the coating forming at least the portion of the blade surface intended to contact the nonwoven web, and wherein the Coating on the contact surface has an open-pore material whose pores are at least partially filled with a y yer.
  • a blade according to this embodiment has good sliding properties and a dirt-repellent effect on the contact surface provided for contact with a subject guided along it. These properties reduce the forces on the coating, thereby increasing the life of the coating and reducing the risk of damage to the coating during use of the blade.
  • the polymer comprises an epoxy resin, since this is the open-pore coating material. in the non-crosslinked or partially crosslinked state well wetted and thus can penetrate deep into the pores of the coating.
  • the polymer advantageously comprises a silicone-polyester resin, since this combines very good non-stick and thus sliding properties with excellent dirt-repellent effect.
  • fillers may be embedded in the polymer, the fillers of preferred embodiments thereof containing polyfluoroethylene (PFE) and in particular polytetrafluoroethylene (PTFE).
  • the fillers are in the form of particles, and in particular in the form of particles with average diameters in the range of 0.1 to 5 ⁇ ago.
  • the polymer can also directly from polyfluoroethylene. and in particular polytetrafluoroethylene or a polymer comprising such a substance.
  • polytetrafluoroethylene particles having sizes from the range are preferred. slurried from about 50 to 100 nm and introduced the resulting dispersion in the pores, for example by means of an immersion bath, by spraying or by applying with a brush or other coating device.
  • a polymer which is in the form of particles having a size distribution in which at least 65 percent of the particles have one or more sizes from the range of 50 to 100 nm.
  • the open-pore base material of the coating is in embodiments of an oxide ceramic or of a mixture of two or more oxide ceramics. Other embodiments include an open-pore coating base material comprising one or more oxide ceramics.
  • the oxide ceramics in preferred embodiments are selected from alumina, zirconia, magnesia, chromium (III) oxide, yttria, and titanates, which combine good mechanical resistance with high abrasion resistance and can be applied to the blade main body by modern high speed spray techniques such as HVOF .
  • the open cell material of the coating comprises a cemented carbide which also combines good mechanical resistance with high abrasion resistance and can be effectively and economically applied to the blade body with modern high speed injection molding techniques.
  • the porosity of the coating base material is preferably between 2 and 10 percent, these values representing the area proportions of the pores in a cross-section passing through the material.
  • the average pore diameter of the coating base material in embodiments has a value from the range of 5 to 15 ⁇ .
  • an adhesive layer is arranged between these in embodiments.
  • a blade as indicated above is designed as a creping doctor with a working edge and a shoulder surface or as a doctor blade.
  • Creping scraper in the area around the working edge shows
  • Figure 2 is a schematic cross section through a
  • FIG. 1 shows a cross section through the front region of a creping doctor 10 provided with a coating 12.
  • the creping doctor 10 has a main body 11, for example made of steel, on which a coating 12 is applied.
  • the coating 12 occupies at least the portion of the creping doctor 10 which comes into contact with the dry or Yankee cylinder and the nonwoven web of the paper web.
  • an intermediate layer 13 may be provided between the coating 12 and the Base 11 between the coating 12 and the Base 11 .
  • the working edge 14, with which the creping doctor rests against the dry or Yankee cylinder, adjoins the ramp surface 15, against which the paper web impinges. Bake surface 15 and working edge 14 are formed on the coating 12.
  • the coating 12 has two components, one of a coating base material formed
  • the density of the cavities is approximately constant in the illustrated embodiment.
  • the cavities are formed when the coating material is applied to the base body 11 or to the adhesion promoter layer 13 and are called pores.
  • the density of the pores 17 does not have to be approximately constant as shown, but may change from the surface of the coating in the direction of the main body, for example in order to promote rapid shrinkage of the creping doctor 10.
  • the coating matrix has an open-pore design, the term "open-pored" meaning that cavities located deeper in the matrix are connected to cavities located on the surface of the coating.
  • the coating base material is first applied to the base body 11 or, if an adhesion promoter is used, applied to the previously applied, for example, using a thermal spraying method applied to the base body 11 Haf mediator layer 13.
  • the selection of suitable materials for the formation of the primer layer depends both on the material used to form the body, as well as the coating base material used in each case. If the base body 11 on the surface to be coated, for example made of steel, then the material for the
  • a thermal spraying method is preferably used for applying the coating base material.
  • the spray coating is preferably carried out in several strokes, for example with 10 to 100 strokes. Each stroke generates a thin layer of the coating material, wherein the first layer is sprayed directly onto the surface of the main body 11 or the adhesive layer previously applied thereto, and further layers are sprayed onto the respectively previously applied layer.
  • the physical homogeneity or, conversely, the porosity of the individual layers can be adjusted via the parameters of the method used. For example, in the spray process referred to as HVOF (High Velocity Oxygen Fuel), the porosity may be due to the ratio of fuel to oxygen and to the rate of filming used
  • HVOF High Velocity Oxygen Fuel
  • Be adjusted powder material By changing the parameters from layer to layer, the porosity can be changed over the layer depth in the above-mentioned ranges.
  • Commercially available hard metal powders with about 8-10% cobalt and tungsten monocarbide as hard material are suitable as the coating base material.
  • ceramic coatings are preferably powder oxide ceramic materials such. For example, alumina, zirconia, magnesia, crom (III) oxide, yttria and titanates use.
  • the filling of pores in this document means the introduction of material into the pores, wherein the introduced material does not have to completely fill the respective pore volume, but can.
  • the introduced material can be applied to the pore walls, but it can also be arranged completely or partially detached from the pore walls in the pore volume.
  • 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 blade coating that the thermoset behaves elastically. In an analogous manner are thermoplastics whose glass transition temperature so far above the operating temperature of the
  • Blade coating is that when used with the polymer impregnated blade no disturbing softening of the polymer can occur.
  • Decomposition or glass transition temperature can be specified 20 ° C. Below operating temperature is the operating temperature.
  • 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 the epoxy resin in the non-wetted or partially crosslinked state exhibits good wetting of the coating base material, it can, for example, be supported by capillary action, penetrate deep into its open pores and fill them. The viscosity of the epoxy resin can be reduced by the addition of solvents, such as alcohols or ketones, to adjust the penetration depth of the polymer to the thickness of the coating.
  • the impregnation process, ie the introduction of the material into the pores of the blade coating can be carried out by means of an immersion bath, by spraying, or by means of brushing tools such. B. brushing or filling.
  • Adhesive layer 13 is applied to a surface region of a base body 11 formed of steel. On the free surface of the Haf mediator layer 13 is then applied by means of a plasma spraying, for example, the above-mentioned HVOF process, a ⁇ 303 ceramic.
  • a plasma spraying for example, the above-mentioned HVOF process, a ⁇ 303 ceramic.
  • Powder preferably has a particle size distribution in which the grain size, which is not exceeded by 90% of the hard grains, at least twice as large and preferably at least three times as large as the grain size, which is not exceeded by 10% of the hard grains, in particular a
  • the thickness of the applied Cr 2 0 3 layer is according to embodiments about 300 ⁇ , the porosity of the layer about 2 to 3%, wherein the average pore diameter in the range of about 5 to 15 ⁇ . Pore diameter here is to be understood as meaning the diameter of a circle whose surface area corresponds to the pore cross-section at the respective location.
  • the hardness of a Cr 2 O 3 coating layer produced in this way can be given as approximately 1150 HVO, 3 (Vickers hardness in HV). After application of the Cr 2 0 3 coating, a filling material is introduced into the pores 17 thereof.
  • the filler is composed of a mixed with isobutanol silicone polyester resin containing PTFE particles with average sizes of 0.1 to 5 ⁇ ⁇ .
  • the proportions of the silicone-polyester resin in the filler are between 40 and 70 wt .-%, of the isobutanol between 10 and 60 wt .-% and the de PTFE particles between 2 and 20% wt. -%.
  • a likewise preferred embodiment differs from the one described above in the choice of filling material.
  • the filling material of this embodiment consists of a mixture of epoxy resin and isobutanol, the. Contains PTFE particles with average diameters of 0.1 to 5 ⁇ .
  • the proportions of the epoxy resin on the filling material are again between 40 and 70% by weight, that of the isobutanol between 10 and 60% by weight and that of the PTFE particles between 2 and 20% by weight.
  • the depth to which the filling material penetrates into the coating matrix 16 is determined by the viscosity of the filling material and the temperature of the
  • Coating matrix influenced during the filling process.
  • the viscosity of the filling material is low, whereby the pores can be filled to great depths.
  • the maximum penetration depth of the filling material can be further increased provided that the temperature is sufficiently below the crosslinking temperature.
  • Penetration temperatures from the range of about 70 to about 90 ° C, and preferably about 80 ° C are suitable for the above Golfmaterialsysteme, which achieved at the above mean pore diameters of about 5 to 15 ⁇ penetration depths of about 800 to about 1000 / zm can be.
  • the filling material After the introduction of the filling material into the pores of the coating matrix 12, it is preferably thermally crosslinked, whereby the impregnation of the coating matrix 16 is completed. Finally, the free surface of the impregnated coating 12 is honed to create a smooth ramp surface and a smooth working edge. In such a regrinding usually about 50 ⁇ coating material are removed.
  • the described sequence of impregnation and fine grinding is not mandatory and can possibly also be reversed. be executed.
  • non-woven fabric and dry or Yankee cylinders with little friction can slide along the respective contact surfaces of the creping doctor. The increased lubricity of the contact surfaces reduces the abrasion of the coating.
  • the receives the same In addition, the receive
  • the schematic Dai-position of Figure 2 shows a cross section through the front portion of a doctor blade 22 provided with a doctor blade 20.
  • the doctor blade has a base body 21, which may be formed for example of steel, and a coating 22 and a forms in some embodiments between two arranged adhesion-promoting layer 23.
  • the coating 22 occupies at least the part of the doctor blade 20, which comes into contact with the non-woven fabric of the paper web or a sheeting applied thereto.
  • the doctor blade 20 has a chamfer, commonly referred to as wate.
  • the coating 22 covers the main body 21, as illustrated in the figure, also in the area of the wate.
  • the coating structure of the doctor blade corresponds to that of the creping doctor, i. H.
  • the coating consists of a porous coating matrix as described above, the pores of which are at least partially filled with a polymer as likewise mentioned above.
  • the contact surface of the coating to the paper web has improved lubricity and smear-resistant effect, thus reducing the likelihood of damage to the coating resulting in microlining manifesting on the coated paper in the form of linear irregularities being able to lead.
  • Blades according to the invention described have due to the better sliding properties of the
  • Coating surface has improved abrasion resistance than blades with not properly impregnated coatings.
  • the impregnation also reduces the likelihood of damage to the coating during. the operation and improved because of their schmu zab doden effect the quality of a machined with the blade paper web.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)

Abstract

L'invention concerne une lame pour le traitement de bandes de non-tissé, comprenant un corps de base (11, 21) et un revêtement (12, 22) recouvrant au moins une partie de la surface du corps de base, le revêtement formant au moins une partie de la surface de lame qui est destinée à entrer en contact avec la bande de non-tissé et le revêtement (12, 22) présentant sur la surface de contact un matériau (16) à pores ouverts dont les pores (17) sont remplis au moins en partie avec un polymère.
EP11787852.0A 2010-12-13 2011-11-22 Revêtement de lame imprégné Revoked EP2651632B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010062901A DE102010062901A1 (de) 2010-12-13 2010-12-13 Imprägnierte Klingenbeschichtung
PCT/EP2011/070659 WO2012079923A1 (fr) 2010-12-13 2011-11-22 Revêtement de lame imprégné

Publications (2)

Publication Number Publication Date
EP2651632A1 true EP2651632A1 (fr) 2013-10-23
EP2651632B1 EP2651632B1 (fr) 2015-02-25

Family

ID=45033969

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11787852.0A Revoked EP2651632B1 (fr) 2010-12-13 2011-11-22 Revêtement de lame imprégné

Country Status (5)

Country Link
US (1) US20130269897A1 (fr)
EP (1) EP2651632B1 (fr)
CN (1) CN103347688A (fr)
DE (1) DE102010062901A1 (fr)
WO (1) WO2012079923A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010062901A1 (de) * 2010-12-13 2012-06-14 Voith Patent Gmbh Imprägnierte Klingenbeschichtung
DE102014012738B4 (de) * 2014-08-27 2023-03-30 Rampf Formen Gmbh Form, Rüttelbare Unterlage und Ziehblech mit beschichteten Oberflächen, Verfahren zu deren Herstellung sowie Verwendung der Beschichtungen
CN106182906A (zh) * 2016-07-13 2016-12-07 北京华恩表面工程技术有限公司 一种起皱刀及其制备方法
CN106493437A (zh) * 2016-12-29 2017-03-15 泰州前进科技有限公司 一种刮刀
WO2018181034A1 (fr) * 2017-03-29 2018-10-04 京セラ株式会社 Outil revêtu et outil de coupe
DE102018214778A1 (de) * 2018-08-30 2020-03-05 Siemens Aktiengesellschaft Verfahren zur Fertigung von Leiterbahnen und Elektronikmodul
EP4137304A1 (fr) * 2021-08-16 2023-02-22 Voith Patent GmbH Lame et agencement de crêpage

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GB978988A (en) * 1962-12-14 1965-01-01 Lodding Engineering Corp Doctor blade
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GB2295400B (en) * 1994-11-01 1998-04-01 Plasma Coatings Ltd Blade and method of manufacture thereof
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FR2780318B1 (fr) * 1998-06-29 2000-09-08 Radiance Lame composite, pouvant trouver application dans differents domaines techniques ou industriels, notamment dans l'industrie papetiere et l'imprimerie
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US9132687B2 (en) * 2010-01-20 2015-09-15 Daetwyler Swisstec Ag Doctor blade
DE102010062901A1 (de) * 2010-12-13 2012-06-14 Voith Patent Gmbh Imprägnierte Klingenbeschichtung

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Title
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Also Published As

Publication number Publication date
CN103347688A (zh) 2013-10-09
WO2012079923A1 (fr) 2012-06-21
DE102010062901A1 (de) 2012-06-14
US20130269897A1 (en) 2013-10-17
EP2651632B1 (fr) 2015-02-25

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