EP3661658A1 - Procédé de revêtement d'une bande de matériau - Google Patents

Procédé de revêtement d'une bande de matériau

Info

Publication number
EP3661658A1
EP3661658A1 EP18735546.6A EP18735546A EP3661658A1 EP 3661658 A1 EP3661658 A1 EP 3661658A1 EP 18735546 A EP18735546 A EP 18735546A EP 3661658 A1 EP3661658 A1 EP 3661658A1
Authority
EP
European Patent Office
Prior art keywords
enclosure
coating
air
material web
interior
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.)
Withdrawn
Application number
EP18735546.6A
Other languages
German (de)
English (en)
Inventor
Martin Schmid
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
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP3661658A1 publication Critical patent/EP3661658A1/fr
Withdrawn legal-status Critical Current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
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/0245—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work for applying liquid or other fluent material to a moving work of indefinite length, e.g. to a moving web
    • 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
    • B05C15/00—Enclosures for apparatus; Booths
    • 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
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/005—Curtain coaters
    • 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
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/007—Slide-hopper coaters, i.e. apparatus in which the liquid or other fluent material flows freely on an inclined surface before contacting the work
    • B05C5/008—Slide-hopper curtain coaters
    • 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
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/08—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation
    • B05C9/10—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation the auxiliary operation being performed before the application
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/30—Processes for applying liquids or other fluent materials performed by gravity only, i.e. flow coating
    • B05D1/305—Curtain coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0218—Pretreatment, e.g. heating the substrate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0254—After-treatment
    • 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
    • D21H23/46—Pouring or allowing the fluid to flow in a continuous stream on to the surface, the entire stream being carried away by the paper
    • D21H23/48—Curtain coaters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B16/00—Spray booths
    • B05B16/60—Ventilation arrangements specially adapted therefor

Definitions

  • the coating of material webs has been known for a long time.
  • the coating of paper or board webs by means of a curtain application has developed strongly in recent years.
  • a coating medium e.g. a coating color from a nozzle under the influence of gravity applied to the web.
  • the coating medium is applied in the form of a thin curtain on the material web.
  • the curtain is very susceptible to external disturbances, e.g. Is air currents, the coating unit is often provided with a housing.
  • the air in this enclosure is naturally very humid, since moisture is introduced into the interior of the enclosure both via the fibrous web and via the coating medium. This moisture can condense in cool places, and drop as drops of water, for example, on the web and damage them.
  • housings known which are operated air-conditioned which are operated air-conditioned.
  • the warm, moist air is sucked out of the enclosure, while cooled or dried air is blown into the enclosure.
  • the temperature in the enclosure can be kept substantially constant.
  • the object is completely achieved by a method for coating a material web in particular a fibrous web by means of a coating device, wherein the coating device has a coating unit for applying a coating medium on the web and a housing, and wherein the application unit is arranged in the interior of the housing and the housing a Having first opening to the inlet of the web and a second opening to the exit of the web.
  • an overpressure is generated which is greater than the ambient pressure outside the enclosure, so that air from the interior of the enclosure through the first and / or the second opening from the enclosure to the outside flows.
  • the moist and warm air from the enclosure is therefore not actively sucked, but passively escapes through the openings of the enclosure.
  • a housing of a coating device can not be hermetically sealed. Through the inlet and in particular the outlet of the web always arise openings through which the air can escape. However, other openings may be present through which the air can escape, such as maintenance opening, access doors or the like.
  • the escape of air through the inlet opening of the material web still has a very beneficial effect.
  • This outward air flow along or in the vicinity of the material web counteracts the towing air, which would otherwise be dragged with the incoming material web into the enclosure.
  • This drag air is usually humid and warm relative to the normal climate (23 ° C, 50% relative humidity). Thus, this heat and moisture usually get into the enclosure with the towing air. Due to the outflowing air in one embodiment of the method described here, however, this entraining air is kept wholly or partly outside the enclosure.
  • the coating device may be a curtain coater.
  • the coating medium falls in the form of a thin curtain under the influence of gravity on the moving material web.
  • It can be a one-tier or multi-tier order.
  • two, three or more coating devices are provided within the housing. These may be the same or different coating devices.
  • the overpressure is generated by blowing a stream of air into the enclosure.
  • air can also be sucked into the enclosure from the outside.
  • the air flow can optionally be conditioned before being injected into the housing by being cooled, heated or dried when it is needed for the application.
  • the air flow which is blown or sucked into the enclosure, more than 1000 m 3 / h, in particular more than 4000 m 3 / h, in particular between 8000m 3 / h and 13000 m 3 / h is.
  • the amount of air can also be changed during the operation of the coating apparatus. For example, the amount of air can be increased if the operating speed of the coating device is increased.
  • the air stream is blown or sucked into the housing at a temperature of less than 23 ° C., preferably less than 20 ° C., particularly preferably less than 15 ° C.
  • This relatively cool air is then typically heated within the enclosure by e.g. the material web, and leaves the housing usually with a higher
  • the incoming material web becomes a surface in common applications
  • the volume flow and / or the temperature and / or the moisture content of the injected air is measured. This measurement can in each case be carried out selectively, or else continuously during the operation of the coating apparatus.
  • the air pressure is measured at least at one point in the interior of the enclosure.
  • a measurement of the ambient pressure can also take place outside the housing.
  • the difference between the pressure outside and inside the enclosure can be used to regulate or control the supply of air to the interior of the enclosure.
  • the overpressure in the interior of the enclosure relative to the ambient pressure outside the enclosure is at least 8 Pa. Even higher pressures such as 10 Pa, 12 Pa, 15 Pa, 20 Pa or more may be advantageous.
  • the overpressure inside the enclosure is kept constant, or that it is variable.
  • the overpressure is changed as a function of process parameters, such as the speed of the material web.
  • the air supplied via the air flow escapes more than 50%, preferably more than 80%, particularly preferably completely passive, through one or more openings from the enclosure.
  • the coating device can be operated so that a fixed amount of air is supplied to the enclosure.
  • the overpressure occurring within the enclosure can then be adjusted, for example, by means of partial extraction of the air from the enclosure.
  • pressure measurements are provided inside and / or outside the enclosure.
  • the material web has undergone a drying process and / or a further coating process before it enters the coating device. In such a case, the temperature of the material web and the moisture carried by it are particularly large and the advantages of the method are particularly significant.
  • FIG. 1 shows a coating apparatus for carrying out an aspect of the method according to the invention.
  • FIG. 1 shows a coating device 1 in which an application unit 3, which is designed as a curtain application unit 3, is arranged in the interior 5a of a housing 4.
  • the material web 2 which may be, for example, a paper or board web 2 is passed through a first opening 6, usually a slot, into the interior 5a of the housing 4, where it is coated by means of the application unit 3 with a coating medium.
  • Typical coating media are pigmented coating colors, e.g. CaCO3 or ⁇ 2 may contain.
  • materials such as polyvinyl alcohol (PVA) have also found application.
  • PVA polyvinyl alcohol
  • the material web 2 leaves the enclosure 4 through a second opening 7. While only the coating with a curtain application unit 3 is shown here by way of example, the invention also includes embodiments in which other application units 3 are used. Likewise, several commissioned works 3 can be provided in the housing 4.
  • an air flow 10 is directed into the interior 5a of the enclosure 4 by means of a fan 8 or another suitable inlet 8. This results in the interior 5a of the enclosure 4, a pressure which is higher than outside 5b of the enclosure 4.
  • This air flow 10 may for example have a temperature of less than 23 ° C. This serves the Cooling of the interior 5a, as through the web 2 continuously heat is introduced into the interior 5a of the enclosure, which I would heat them without air conditioning.
  • condensation of the moisture present in this air could occur-for example, on cool components of the application device 3. If these condensed moisture drips onto the material web 2, for example, the coating or even the material web 2 can be damaged.

Landscapes

  • Application Of Or Painting With Fluid Materials (AREA)
  • Paper (AREA)
  • Coating Apparatus (AREA)

Abstract

La présente invention concerne un procédé pour recouvrir une bande de matériau (2), en particulier de matériau fibreux, au moyen d'un dispositif de revêtement, ledit dispositif de revêtement (1) présentant un agrégat de revêtement (3) pour déposer un agent de revêtement sur la bande de matériau ainsi qu'un compartiment (4) et l'agrégat de revêtement étant placé à l'intérieur du compartiment et le compartiment présentant une première ouverture pour l'admission de la bande de matériau et une seconde ouverture pour la sortie de la bande de matériau. L'invention est caractérisée en ce que, pendant le revêtement de l'intérieur du compartiment, une pression positive est générée, laquelle est supérieure à la pression ambiante régnant à l'extérieur du compartiment, de telle sorte que l'air provenant de l'intérieur du compartiment s'écoule par la première et/ou la seconde ouverture depuis le compartiment vers l'extérieur (5b).
EP18735546.6A 2017-08-02 2018-06-27 Procédé de revêtement d'une bande de matériau Withdrawn EP3661658A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017117460 2017-08-02
PCT/EP2018/067174 WO2019025084A1 (fr) 2017-08-02 2018-06-27 Procédé de revêtement d'une bande de matériau

Publications (1)

Publication Number Publication Date
EP3661658A1 true EP3661658A1 (fr) 2020-06-10

Family

ID=62791739

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18735546.6A Withdrawn EP3661658A1 (fr) 2017-08-02 2018-06-27 Procédé de revêtement d'une bande de matériau

Country Status (4)

Country Link
US (1) US20200164399A1 (fr)
EP (1) EP3661658A1 (fr)
CN (1) CN110997158A (fr)
WO (1) WO2019025084A1 (fr)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3508947A (en) * 1968-06-03 1970-04-28 Eastman Kodak Co Method for simultaneously applying a plurality of coated layers by forming a stable multilayer free-falling vertical curtain
JPH0622468Y2 (ja) * 1990-02-08 1994-06-15 新日本製鐵株式会社 カーテン塗装装置
US5114759A (en) * 1990-07-30 1992-05-19 Eastman Kodak Company Apparatus and method for curtain coating
US5206057A (en) * 1992-01-10 1993-04-27 Eastman Kodak Company Method and apparatus for adjusting the curtain impingement line in a curtain coating apparatus
FI115314B (fi) * 2001-03-13 2005-04-15 Metso Paper Inc Sovitelma paperin tai kartongin käsittelemiseksi
DE10358754B4 (de) * 2003-12-12 2011-07-14 M-Real Oyj Bahnfördervorrichtung
DE102009000809A1 (de) * 2009-02-12 2010-08-19 Voith Patent Gmbh Vorhang-Auftragswerk
DE102010031558A1 (de) 2010-07-20 2012-01-26 Voith Patent Gmbh Vorhangauftragswerk
DE102010041713A1 (de) * 2010-09-30 2012-04-05 Voith Patent Gmbh Vorrichtung zum direkten oder indirekten Auftrag von flüssigem bis pastösem Auftragsmedium und Verfahren zum Betreiben einer derartigen Vorrichtung

Also Published As

Publication number Publication date
CN110997158A (zh) 2020-04-10
WO2019025084A1 (fr) 2019-02-07
US20200164399A1 (en) 2020-05-28

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