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WO2018172327A1 - Amélioration apportée à une lame de couchage pour appliquer une matière sur une surface - Google Patents

Amélioration apportée à une lame de couchage pour appliquer une matière sur une surface Download PDF

Info

Publication number
WO2018172327A1
WO2018172327A1 PCT/EP2018/056967 EP2018056967W WO2018172327A1 WO 2018172327 A1 WO2018172327 A1 WO 2018172327A1 EP 2018056967 W EP2018056967 W EP 2018056967W WO 2018172327 A1 WO2018172327 A1 WO 2018172327A1
Authority
WO
WIPO (PCT)
Prior art keywords
blade
support
creping doctor
coating
support blade
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.)
Ceased
Application number
PCT/EP2018/056967
Other languages
German (de)
English (en)
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.)
Horst Sprenger GmbH
Original Assignee
Horst Sprenger 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
Application filed by Horst Sprenger GmbH filed Critical Horst Sprenger GmbH
Publication of WO2018172327A1 publication Critical patent/WO2018172327A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B05C11/04—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with blades
    • B05C11/044—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with blades characterised by means for holding the blades
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G3/00—Doctors
    • D21G3/04—Doctors for drying cylinders
    • 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
    • D21H23/34—Knife or blade type coaters
    • 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

Definitions

  • the invention relates to a device for applying liquid or pasty material on sheet material by means of a coating blade, wherein the coating blade is supported by a support blade, or it relates to a device for scraping a web, in particular a paper web, from a drying cylinder by means of a creping doctor, wherein the creping doctor is supported by means of a support blade according to the features of the respective preamble of the independent claim 1 or 2.
  • liquid or pasty material such as a paint
  • a flat material in particular in web form, for example a paper web
  • the web-shaped material is transported by a cylindrical roller past the tip of the coating blade and at the same time the liquid or pasty material is applied, which is distributed over a large area during the movement of the sheet material by means of the coating blade on the web to ensure a uniform order.
  • the coating blade is at a defined distance from the surface of the web-like material. Due to the width of the sheet material and according to the width of the coating blade, it is necessary to stabilize them during operation.
  • a support blade is already known, which, as well as the coating blade, is clamped in a corresponding holding device, wherein the support blade with its tip supports the coating blade at least over a partial width.
  • the linear support means of the support blade forms a kind of fulcrum around which the coating blade, if only minimal, can be moved.
  • the coating blade is clamped in its one end region in the holding device, with the region facing away from it approaching the surface of the sheet-like material and the support being provided therebetween by means of the supporting blade. This implies that when the end of the coating blade facing away from the holding device acts on a force when applying the liquid or pasty material, the coating blade can move around the fulcrum (supporting surface of the supporting blade). As a result, a defined application of the liquid or pasty material to the web-like material is no longer optimal.
  • devices for scraping a web, in particular a paper web, from a drying cylinder by means of a creping doctor are used, the creping doctor being supported by means of a support blade.
  • the drying cylinders for example so-called Yankee cylinders
  • the operating conditions are demanding.
  • the high temperatures lead to thermal expansion of the cylinder and a high load in the bearing inner rings.
  • the vapor pressures and fluctuating temperatures of the drying cylinder is not exactly cylindrical in operation over its axial length, but it expands in the center region stronger than in the edge region (so-called camber).
  • the creping doctor does not rest with the required accuracy on the surface of the drying cylinder over its entire length in order to scrap the material uniformly there.
  • the invention is therefore based on the object to avoid the disadvantages described in a coating blade or a creping doctor. This object is achieved by the two independent claims.
  • the invention provides that the support blade no longer rests with its rectilinear end portion of the coating blade, but that a large-scale system is provided.
  • Such a large-scale plant can be realized in various ways.
  • the large-scale system is realized by the support blade itself.
  • a bend in the end region of the support blade that is, facing away from the holding device of the support blade
  • the enlargement of the support surface of the support blade is formed by a pluggable on the support blade reinforcement.
  • This may, for example, be a type of shoe which is slipped onto the end region of the support blade facing the coating blade.
  • the attachable reinforcement consists of plastic.
  • the shoe may be made of a hard plastic material, which is manufactured and then attached to the support blade for ease of assembly. It can also be thought of spraying this reinforcement on the end region of Stützkiinge of a plastic material.
  • a reinforcement made of polyurethane which in addition to the stability required to form the desired large-area support also has a certain elasticity to follow the bending length of the coating blade.
  • the formation of the reinforcement as a kind of shoe has the advantage that they not only secure on or on the support blade for the purpose of large-scale support of the appropriate means that ensure a plugging Coating blade can be attached, but that they can also easily be exchanged or retrofitted.
  • the invention also generally relates to a creping doctor for scraping a paper web, in particular a tissue web, from a drying cylinder which has a blade-shaped basic body made of metal with a working edge which can be applied to the drying cylinder, wherein, for example, the working edge is covered by an additional layer of hard material.
  • a creping doctor for scraping a paper web, in particular a tissue web
  • the structure of such a creping doctor and its function are explained in detail in DE 10 2006 001 336 A1.
  • Creping scrapers are used to scrape a paper web from a drying cylinder. When the paper web is scraped off, it is detached from the drying cylinder and at the same time partially stopped so that a porous product (tissue) is formed. This process is called creping.
  • the invention provides that the support blade no longer rests with its rectilinear end portion of the creping doctor, but that a large-scale system is provided.
  • a separately formed reinforcement is provided, which is applied to the end portion of the support blade to allow a large-area support of the creping doctor.
  • This may be, for example, a kind of shoe which is attached to the end region of the support blade facing the creping doctor. It may also be thought of spraying this reinforcement onto the end region of the support blade made of a plastic material.
  • a reinforcement made of polyurethane which in addition to the stability required to form the desired large-area support also has a certain elasticity to follow the bending length of the creping doctor.
  • the formation of the reinforcement as a kind of shoe has the advantage that they can be secured by appropriate middle !, Which ensure fitting, not only safe on or on the support blade for the purpose of large-scale support of the creping doctor, but that they also readily exchanged or retrofitted can be.
  • the enlargement of the support surface of the support blade is formed by a arranged on the support blade hollow chamber element with a cavity, wherein the cavity is filled with an incompressible medium.
  • This hollow chamber element on the support blade Can be used in conjunction with the coating blade or in conjunction with the creping doctor. Although reference will be made only to the creping blade in the following description regarding the hollow chamber member and its various embodiments, it may be used in conjunction with the coating blade.
  • the hollow chamber element according to the invention extends over a larger portion of the drying cylinder, preferably over the entire width of the drying cylinder. Due to the incompressible medium within the hollow chamber element, the bending vibrations of the creping doctor (or the coating blade) are damped across the width, thereby effectively avoiding the disadvantageous chatter marks. It is advantageously achieved the goal that prevail at the top of the creping doctor, which is facing in the direction of the drying cylinder, as much as possible line forces. In addition, this can follow the tip of the creping doctor over its entire width of the deformation (camber) of the drying cylinder, so that this tip of the creping doctor can adapt over its entire width to the surface of the drying cylinder.
  • the entire element prevents like the shoe-like support vibrations by the bending vibration (s) of the creping doctor (alternatively the coating blade) and possibly also the support blade are prevented.
  • the liquid filling leads to an automatic correction or to a homogenization of the line force arising at the tip of the creping doctor blade facing the drying cylinder.
  • the pressure of the incompressible medium in the cavity can be regulated. This allows the tip of the creping doctor to be optimally adapted to the surface of the drying cylinder during operation. In particular, this temperature fluctuations, tolerances and wear due to the operation can be compensated. There is no subsequent adjustment of the position of the creping doctor with respect to the Trocknungszyünder required.
  • the incompressible medium is a liquid. As a result, the function of the hollow chamber element can be realized in a simple and uncomplicated manner, wherein a liquid is particularly suitable for tracking and compensating for the deformation of the drying cylinder by acting on the creping doctor.
  • the hollow chamber element is a hose.
  • the device with which the creping doctor (or the doctor blade) is supported in conjunction with the support blade in order to damp its bending vibrations and to realize forces that are as equal as possible to the tip thereof, and the deformation of the drying cylinder in particular can be realized in a simple manner counteract temperature fluctuations and thereby avoid the formation of chatter marks.
  • such a tube can be particularly easily arranged on the support blade and arranged parallel to the creping doctor over its axial extent.
  • such a tube is very easy to fill with the incompressible medium and then close.
  • the optional control of the pressure of the incompressible medium, in particular the liquid within the tube can be easily realized.
  • FIGS. 1 and 2 Further embodiments, which relate to the enlargement of the support surface, starting from the support blade in the direction of the coating blade or the creping doctor, are shown in FIGS. 1 and 2 and described below.
  • 1 shows a doctor blade of a device not shown in detail for applying pasty or liquid material to a web-like material which is moved by means of a cylindrical transport element.
  • the coating blade 1 is clamped in a holding device between two jaws 2, 3.
  • a support blade 4 is provided, which in turn is also in a holding device, for example, two jaws 5, 6, clamped.
  • a reinforcement 7 is provided, which is formed in this embodiment as a kind of attachable shoe on the support blade 4. This reinforcement 7 aims that the basically narrow contact surface of the actual support blade 4 is significantly increased at the coating blade 1.
  • the illustrated reinforcement 7 in the form of a shoe and the end portion of the support blade 4 can be angled with or without reinforcement 7 in order to realize a larger contact surface of the support blade 4 on the coating blade 1.
  • the device shown in Figure 1 thus also relates to a device for scraping a web, in particular a paper web, from a drying cylinder by means of a creping doctor similar to the apparatus shown for applying liquid or pasty material on sheet material by means of a coating blade, as in both devices the bearing surface of the support blade (once on the coating blade and once on the creping doctor) is formed enlarged.
  • the invention is thus independent of the application or design of the coating blade or the creping doctor.
  • FIG. 2 shows in detail the exemplary embodiment of a device for scraping off a web, in particular a paper web, from a drying cylinder by means of a creping doctor.
  • the apparatus of Figure 2 also has two facing jaws 2, 3, in which in this case not the coating blade, but a creping doctor 12 is clamped. This creping doctor 12 scrapes material from an indicated drying cylinder 13. This process does not require a detailed representation, because it is known in principle.
  • the creping doctor 12 is in this case indirectly, that is, without direct contact, a support blade 4 faces, which is clamped in two jaws 5, 6.
  • a support device 8 is arranged on the end of the support blade 4 facing away from the jaws 5, 6.
  • the support device 8 consists of a Haiter 9, which is fixed on the one hand fixed to the end of Stützkiinge 4.
  • the holder 9 carries a hollow chamber element, which in this embodiment as a hose 10 is designed with a cavity 11.
  • the omega-shaped cross-section of the tube 10 since it simply clamped by its protruding legs in the holder 9, the corresponding grooves and thereby can be fixed to the holder 9.
  • the cross section shown in FIG. 2 results in an enlarged bearing surface of the hose 10 on the creping doctor 12 in order to achieve the advantages already described.
  • a single tube 10 is shown, it is optionally conceivable, even more than a hollow chamber element, that is, for example, more than one hose 10, set parallel to each other on the holder 9.
  • the cavity 11 of the tube 10 is filled with an incompressible medium, in particular a liquid (not shown).
  • magnification of the support surface of the support blade 4 extends (in a direct system, as shown in Figure 1, or an indirect investment on the support device 8, as shown in Figure 2) over the entire width of the coating blade 1 and the creping doctor 12th the
  • enlargement of the support surface may also extend only over at least one partial region or several partial regions of the entire width of the coating blade 1 or of the creping doctor 12 or over the entire width.

Landscapes

  • Coating Apparatus (AREA)
  • Paper (AREA)

Abstract

L'invention concerne un dispositif permettant d'appliquer une matière liquide ou pâteuse sur un matériau sous forme de bande au moyen d'une lame de couchage (1), ladite lame de couchage (1) étant soutenue au moyen d'une lame d'appui (4). Ledit dispositif se caractérise en ce que la surface de support de la lame d'appui (4) est conçue de manière augmentée sur la lame de couchage (1).
PCT/EP2018/056967 2017-03-20 2018-03-20 Amélioration apportée à une lame de couchage pour appliquer une matière sur une surface Ceased WO2018172327A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102017105882 2017-03-20
DE102017105882.6 2017-03-20
DE102017116616.5 2017-07-24
DE102017116616 2017-07-24

Publications (1)

Publication Number Publication Date
WO2018172327A1 true WO2018172327A1 (fr) 2018-09-27

Family

ID=61768282

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2018/056967 Ceased WO2018172327A1 (fr) 2017-03-20 2018-03-20 Amélioration apportée à une lame de couchage pour appliquer une matière sur une surface

Country Status (2)

Country Link
DE (1) DE102018106428A1 (fr)
WO (1) WO2018172327A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4859507A (en) * 1987-12-02 1989-08-22 Consolidated Papers, Inc. High speed paper coaters
US5624495A (en) * 1994-01-21 1997-04-29 Voith Sulzer Papiermaschinen Gmbh Coating system including flexible blade for coating web material
DE102006001336A1 (de) 2006-01-09 2007-07-12 Martin Bauer Kreppschaber, Verfahren zur Herstellung eines Kreppschabers und Verwendung eines Kreppschabers
EP2514869A1 (fr) * 2011-04-13 2012-10-24 Metso Paper Inc. Porte-racle

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4859507A (en) * 1987-12-02 1989-08-22 Consolidated Papers, Inc. High speed paper coaters
US5624495A (en) * 1994-01-21 1997-04-29 Voith Sulzer Papiermaschinen Gmbh Coating system including flexible blade for coating web material
DE102006001336A1 (de) 2006-01-09 2007-07-12 Martin Bauer Kreppschaber, Verfahren zur Herstellung eines Kreppschabers und Verwendung eines Kreppschabers
EP2514869A1 (fr) * 2011-04-13 2012-10-24 Metso Paper Inc. Porte-racle

Also Published As

Publication number Publication date
DE102018106428A1 (de) 2018-09-20

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