EP1428582B1 - Méthode et appareil pour revêtement au rideau - Google Patents

Méthode et appareil pour revêtement au rideau Download PDF

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Publication number
EP1428582B1
EP1428582B1 EP02027834A EP02027834A EP1428582B1 EP 1428582 B1 EP1428582 B1 EP 1428582B1 EP 02027834 A EP02027834 A EP 02027834A EP 02027834 A EP02027834 A EP 02027834A EP 1428582 B1 EP1428582 B1 EP 1428582B1
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EP
European Patent Office
Prior art keywords
air
web
curtain
coating
supply
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.)
Expired - Lifetime
Application number
EP02027834A
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German (de)
English (en)
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EP1428582A1 (fr
Inventor
Heikki Vatanen
Tapio Pitkäniemi
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.)
Valmet Technologies Oy
Original Assignee
Metso Paper Oy
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Publication date
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Priority to EP02027834A priority Critical patent/EP1428582B1/fr
Priority to DE60209434T priority patent/DE60209434T2/de
Priority to AT02027834T priority patent/ATE318656T1/de
Publication of EP1428582A1 publication Critical patent/EP1428582A1/fr
Application granted granted Critical
Publication of EP1428582B1 publication Critical patent/EP1428582B1/fr
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Classifications

    • 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
    • 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
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00—Photosensitive materials
    • G03C1/74—Applying photosensitive compositions to the base; Drying processes therefor
    • 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
    • B05C9/06—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 two different liquids or other fluent materials, or the same liquid or other fluent material twice, to the same side of the work
    • 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
    • D21H23/30—Pretreatment of the paper
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00—Photosensitive materials
    • G03C1/74—Applying photosensitive compositions to the base; Drying processes therefor
    • G03C2001/7433—Curtain coating

Definitions

  • the present invention relates to a method and apparatus for coating of a paper or board web wherein a web substrate is moved below a hopper means providing a single or multiplayer liquid coating in the form of a freefalling curtain impinging the substrate at a dynamic wetting line and an air shield located upstream of the dynamic wetting line with respect to the moving direction of the web wherein the dynamic wetting line of the coating curtain on the web is oriented generally perpendicular to the moving direction of the web, providing substantially the same air pressure over an essential part of the coating curtain on its front and back side with respect to the moving direction of the web, providing a first supply air flow upstream to the wetting line wherein the supply air flows over a substantial length along the freefalling curtain, and evacuating air from a location further upstream at a supply air flow outlet so that the air near the dynamic wetting line is moved against the moving direction of the web and the boundary air layer entrained to the web.
  • curtain coating methods and apparatus are widely known and used.
  • a continuous web or sheets are continuously moved below a coating hopper.
  • One or more liquid compositions are provided from a hopper arrangement in the form of a liquid curtain.
  • liquid compositions are used of relatively low viscosity, generally less than about 150 cP (centipoise), most in the range from about 5 to about 100 cP.
  • one of the most often addressed problems for coating at speeds higher than approximately 150 m/min is the displacement or deformation of the curtain by the air, which is carried along the uncoated substrate due to friction. That air is carried along with the moving substrate to the coating point, which designates the location where the coating liquid first contacts the substrate. In the curtain coating process this location has the form of a line across the substrate and is referred to as the dynamic wetting line. The area near the substrate where the air is in motion due to friction is called the boundary layer.
  • Another effect is that the curtain is blown up in the direction of the motion of the substrate like a balloon. This results not only in deformation of the wetting line but also results in an irregular coating behavior of the curtain transversely to the coating direction and the momentum of the air or the pressure difference over the curtain may temporarily slit the curtain, thus inducing streaks in the coating.
  • EP 0 489 978 B1 further describes additional arrangements to increase the air resistance by further means like protruding parts, strips or even one or more laminae connected to the air shield and directed towards the web.
  • the laminae are taught to extend over the total width of the air shield or a group of smaller randomly placed laminae.
  • the aim, which should be reached by such an arrangement, is described to obtain a reduced pressure with a low flow rate of evacuated air. Higher flow rates are reported not to be desirable since they can cause non-uniformities inside the air shield. Such non-uniformities are reported to cause band-like disturbances in the coated material.
  • EP 0 489 978 B1 the disclosure of which is hereby incorporated by reference, further reports that the pressure difference between the ambient air and the inside of the air shield has to be high enough to evacuate the boundary layer of air adhering to the web, but needs to be limited to avoid an air flow in a direction from the coating curtain towards the air shield, that is against the moving direction of the web. It is reported that an air flow from the coating curtain towards the air shield may cause the entire liquid curtain or at least a part of it to become sucked up into the air shield, therefore destroying the coating procedure, which is to be avoided under any circumstances.
  • the outlet end of the air shield at a distance between 5 and 30 mm upstream of the wetting line, because smaller distances involve the risk for a swinging curtain to touch and to soil the air shield, thereby interrupting the coating process, whereas larger distances strongly reduce the effect of the air removal and allow rebuilding of a new boundary layer of entrained air.
  • US 5,976,630 to Korokeyi et al. proposes use two different intake slots in combination with an air shield which slots are connected to one common or two separate vacuum pumps, wherein one air intake slot is dedicated to removing the entrained boundary air layer of the moving substrate and one is dedicated to the removal of the entrained boundary air layer of the free-falling curtain. Further it is proposed to provide fresh, filtered, optionally heated, laminar, low velocity air flow having a speed of about 10 to about 20 ft/min (about 5 to about 10 cm/s) which is supplied to the enclosure surrounding the free-falling curtain through an upper perforated wall thereof.
  • the free-falling curtain is to be supplied with fresh air as spent air as withdrawn from the enclosure surrounding the apparatus through exhaust ports in the enclosure.
  • the exhaust ports are described essentially to remove the supplied air to minimize pressure differential across the free-falling curtain.
  • US 5,976,630 is intended to reduce or avoid circulation or vortex pattern of air currents along the curtain, which is named to cause disturbances in the curtain, which in turn can lead to streaks in the coated product.
  • US 6,416,690 to Kustermann describes an arrangement for curtain coating for instance of a paper web which should prevent forming of air bubbles by parts of a boundary air layer entrapped between the substrate and the coating applied in an amount making the coated product economically unusable at coating conditions where the web has a width up to 4 m and coating speeds at up to 1,000 m/min.
  • a dynamic air pressure sensor in close proximity to the wetting line where a coating medium contacts the material web surface, and where an increased dynamic pressure relative to the normal air pressure should be observable caused by the boundary air layer entrained to the substrate web.
  • the dynamic pressure signal is compared to a predetermined dynamic pressure value and a suction device to remove air entrained to the substrate web and/or the coating curtain is controlled to maintain a predetermined dynamic pressure value near the wetting line on the substrate.
  • WO 01/16427 A1 assigned to Valmet Corp. proposes a curtain coater with a conventional doctor arrangement upstream in the travel direction of a web substrate in front of an impingement point of the coating mix curtain on the surface of the web. According to the teaching of this document, besides provision of an usual evacuating means within the doctoring means, it is proposed to increase the momentum of the coating mix curtain by making the height of the falling curtain larger and thereby increasing falling velocity so that the coated liquid becomes more energetic to penetrate through the boundary air layer traveling on the web surface.
  • a gas-injection nozzle downstream from the curtain supplying a significant stream of gas, including air or steam, towards the coating curtain near the wetting line so that the combined momentum of the coating mix curtain and the gas jet becomes sufficiently energetic to force the coating mix to penetrate through the boundary air layer traveling on the web surface and thus, the curtain can unobstructedly adhere to the surface of the web.
  • An apparatus for curtain coating of a paper web includes a hopper means for providing a free-falling curtain of coating liquid, an air shield providing a small gap between the web and the air shield, a first air supply opening extending generally over the width of the web providing a first air flow in the region of the dynamic wetting line where the liquid coating curtain impinges on the web and a suction or vacuum providing means connected to the air shield arranged to remove air and a doctoring means for removal of a boundary layer wherein the arrangement comprises a second air supply flow with an air supply outlet in proximity to the wetting line and wherein for the first and for the second air flow a first air suction means and for a boundary air layer entrained to the web a second air suction means is provided.
  • a first guide member directs the second air flow to the wetting line and a second guide member is located between the second air supply and a vacuum channel of the first suction means.
  • the second guide member has edge providing a slot between the supply air outlet of the second air supply, the first suction means and the moved web.
  • the second guide member is displaceable to change the distance between the edge and the web.
  • the distance between the slot provided by the guiding means and the web can be made greater and therefore the air flow speed in this area can be reduced, which means the wetting line is more stable and vortices can be avoided.
  • the first and second guide member at least partly in the region of the wetting line are plates extending in cross direction over the width of the web to be coated.
  • doctoring means an arrangement can be used as described in the WO 01/16427 A1.
  • Such a doctoring means is complemented with a suction channel extending over the cross-machine width of the web and having its suction channel upstream of the direction of the web movement near the region of the wetting line.
  • the second guide member is displaceable to change the distance of the edge to the web.
  • a web support blow means is provided between the first air suction means and the second air suction means.
  • a further advantage of a web support blow means is, that this support blow disables the rubbing of the web and the air shield.
  • the web support blow means is therefore a non-contact blow with a blow channel extending over the cross-machine width of the web.
  • a guiding shield plate for direction the first supply air along the free-falling curtain is provided.
  • the distance between the nozzle provided by the edge of the second guide means and the web is about 5 mm.
  • the support blow air can be sucked by the boundary air vacuum.
  • the air amount coming with the curtain from the ambient air as first air supply can be at about 0,03 kg/s/m.
  • the supply air amount depends on the web speed. Both supply air namely air coming with the curtain and by the second air supply is evacuated by a common first air suction means.
  • the second air supply it is possible to provide a specific profile of the air flow in cross-machine direction, which means the air flow can be influenced to get a stable curtain at the wetting line by using a lot of adjustable air supply nozzles which extend in cross-machine direction and which can be operated separately.
  • FIG. 1 shows the main parts of a curtain coater as known from the prior art and generally involved with an improved method and apparatus according to this invention.
  • a conventional curtain coater has means, preferably in form of a backing roller 1, for forwarding separate sheets or a continuous web 2 as a substrate to be coated.
  • the web 2 which may comprise a paper is forwarded along the backing roller 1 through the curtain coater.
  • a hopper means 3 located generally above the backing roller 1.
  • Various forms of hopper means 3 are known, generally providing a curtain 4 of a coating liquid 5 free falling over a distance h forwarded over a lid 6 or any other suitable means.
  • the coating curtain 4 is moved towards the web 2 on the backing roller 1 by gravity force and impinging on the web 2 along a wetting line 7 generally perpendicular to the moving direction of the web 2.
  • the wetting line 7 is generally below the lid 6 but moving relatively to the web 2 when in motion and therefore called the dynamic wetting line 7.
  • the area of the curtain coater orientated in a direction where the substrate web 2 is uncoated before reaching the dynamic wetting line 7 is called “upstream”, whilst the area where the web 2 is located after being coated at the dynamic wetting line 7 is called downstream.
  • the hopper means 3 provides a multi-layer coating film provided from several sources 8 (see dotted lines) of coating liquid 5.
  • FIG. 2 schematically shows an arrangement of an air shield means 9 near the dynamic wetting line 7 of a curtain coater as prior art known from US 5,624,715.
  • a small gap 10 is provided between the air shield 9 and the web 2 on the backing roller 1.
  • an air inlet 12 connecting the wetting line 7 with a vacuum pump 13 for extracting air.
  • an air flow is provided by an air supply means 14 through channel 13 into a chamber 16 formed on the upstream side of the curtain 4 approximately from the web 2 at the bottom to lid 6 of the hopper means 3 at the top.
  • the supply air flow depicted by arrows 17 is dedicated to reduce disturbances of the coating curtain 4 by providing an air flow traveling along the falling direction of the curtain 4 to prevent forming of vortex or circular flow patterns within the chamber 16.
  • the air flow 17 is also sucked off by the vacuum pump 13 through opening 12 and vacuum channel 19.
  • the curtain coating apparatus according to the invention is shown in a cross sectional view in figure 3. Parts being the same or similar to those described above are depicted by the same reference number for the ease of understanding. However due to the invention a backing roller 1 is not absolutely necessary.
  • a supply air outlet 20 for providing an air stream towards the downstream edge 11 of the air-shield.
  • the upstream side of the coating curtain 4 is partly shielded by a first guide member 21a to ensure that the second air supply flow 22 from a supply air source 23 does not hit or disturb the free-falling curtain 4 along most of its height.
  • the vacuum pump 13 as first air suction is connected with the air outlet 20 arranged directly upstream of the edge 11 for evacuating air from the wetting line 7.
  • the vacuum pump 13 is capable of removing not only the amount of air entrained with the free-falling curtain 4 from the chamber 16, but also the second air supply flow 22 provided through the air supply opening 20 of the air shield 9 by sucking this air in the air inlet 12.
  • a second guide member 21b is located between the second air supply flow 22 and the vacuum channel 19 as first suction means.
  • the second guide member 21b at the edge 11 at its end facing the web 2 provides a slot between the supply air outlet 20 at the second air supply 22, the first suction means with the air inlet 12 and vacuum channel 19 and the moved web 2. Therefore the second air supply flow 22 and the vacuum channel 19 of the first suction means are in close proximity avoiding a longer gap or distance in the direction opposite to the moving web for sucking the air from the area of the wetting line.
  • the near location to each other namely the second air supply and the vacuum channel and the first and second guide members 21a and 21b, which can be plates extending in cross direction over the width of the web 2, results not only in a better manufacturing and construction of the air shield 9, but also in a better air flow. Especially it is not necessary to use a very high air flow speed for removing the air from the wetting line 7.
  • the slot which is provided between the edge 11 of the second guide member 21b and the web 2, can have a distance of about 1 to 10 mm, preferably 3 to 5 mm, to the web 2.
  • the second air supply flow 22 and the first air suction means with the vacuum channel 19 are located side-by-side only separated by the second guide member 21b.
  • the distance of the nozzle is displaceable by shifting the guide member 21 away from the web 2 for controlling the amount and speed of air flowing through the nozzle.
  • the air chamber 16 is provided upstream of the coating curtain 4 and located between the curtain 4, a guiding shield plate 24 of the air shield 9 and the hopper means 3.
  • the chamber 16 has an opening 25 between the hopper means 3 and the shield plate 24 allowing free flow of air between the chamber 16 and the ambient air space.
  • it is desirable to maintain ambient air pressure within the chamber 16 being the same air pressure on the downstream side of the coating curtain 4, thus, preventing the curtain 4 from being blown up or pulled back.
  • an air flow sensor 26 is arranged for detecting any air flow from ambient air space to the chamber 16 or vice versa.
  • a signal corresponding to an air flow detected is provided from the sensor 26 to a control means (not shown), controlling also the air supply means and thus the second supply air flow 22 towards the dynamic wetting line 7.
  • the sensor 26 and - if necessary - any additional sensor in the air shield 9 can control the air flow within the chamber 16 to ambient air pressure without forming of remarkable air flow on the upstream side of the curtain 4, thus, avoiding any disturbances of the coating curtain 4.
  • first air supply air flow
  • the structure of the air shield 9 and the second supply air system is designed to obtain a air flow speed from the wetting line 7 against the moving direction of the web 2 towards the suction opening 20 of the air shield 9.
  • side plates are provided on both sides of the curtain coater to cover chamber 16, air-shield 9, and at least part of the hopper means 3 in a direction perpendicular to the moving direction of the web 2, to enable proper operation as described above.
  • the hopper means 3 and the air shield 9 are manufactured in two parts with the guiding shield plate 24 in between which provides an opening 25 for the first supply air flow.
  • the shield plate 24 also provides a back wall for the chamber 16.
  • the guiding shield plate 24 is displaceable the amount of air flowing through the opening 25 can be controlled.
  • a doctoring means 27 is used which is located upstream of the vacuum channel 19 in the air shield 9.
  • a doctoring means 27 can be used as described in the WO 01/16427 A1.
  • the doctoring means 27 has a curved contour and extends over the cross-machine width of the web 2 so as to scatter boundary air layer traveling on the surface of the moving web 2 and which has not been deflected on the air shield 9, but flows in the direction of the arrow 28 along the web 2.
  • the doctoring means is complemented with a suction channel 29 extending over the cross-machine width of the web 2 and having a connection with an inlet air opening 30 located at the rear part of the doctoring means and leading to a vacuum pump (not shown).
  • a boundary air layer the thickness of which is determined, among other factors, by the speed of the web 2 and the radius of curvature on the curved contour of the doctoring means 27.
  • the thickness of the air layer remaining between the web 2 and the curved contour of the doctoring means 27 is the range of 0 - 500 p.
  • the web support blow means 31 is a non-contact blow means with a blow channel 32 extending over the cross-machine with of the web 2.
  • a tube or a profile which is in contact with the web also can be used.
  • the blow channel 32 of the web support blow means 31 is directed in an angle against the direction of the moving of the web 2, which means air is blown in direction opposite to the moving web holding the web at a distance from the web support blow means 31. Additionally by this non-contact support blow rubbing of the web 2 at the air shield 9 is avoided.
  • the web support blow means 31 As discussed for the second air supply flow 22 it is also possible to provide the web support blow means 31 with a specific profile of the air flow in cross-machine direction.
  • the air amount coming with the curtain 4 from the ambient air is substantially constant and about 0,03 kg/s/m.
  • the supply air amount depends on the web speed. Both supply air from the supply air flow 22 and air coming with the curtain 4 is evacuated by the first supply air suction with the vacuum channel 19.
  • the doctoring means By using the doctoring means it is possible to reduce the thickness of the boundary layer entering the air shield 9. Due to the fact that there is only a small distance between the air outlet 20 for the second air supply flow 22 it is not absolutely necessary to have a very high air speed against the moving direction of the web 2. Additionally it is possible to create a strong underpressure - if necessary - for a quick removing of air from the wetting line 7. However it is preferred to have no great air movement to avoid turbulence creating vortices.
  • Figure 4 shows a simplified apparatus which does not form part of the present invention according to figure 3. Therefore for identical parts the same reference numbers have been used.
  • the main difference to the apparatus according to figure 3 is that there is only one suction means namely the suction channel 29 for removing the supply air from the wetting line 7 and from the boundary air supply 28 penetrating through the gap 10. As can be seen compared with the apparatus according to figure 3 there is a distance with a gap 33 between the second air supply flow 22 and the suction channel 29 necessary.
  • Possible board grades are: FBB (Folding boxboard), WLC (White lined chipboard), SBS (Solid bleached board), SUS (Solid unbleached board), LPB (Liquid packaging board).
  • the method and apparatus according to the invention provides excellent operating behavior without the necessity of complicated and sophisticated control means and is therefore much easier to use and not only assumed to be more reliable compared to the prior art but in any way much more cost effective.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Coating Apparatus (AREA)
  • Paper (AREA)

Claims (16)

  1. Procédé de couchage par voile d'une feuille continue de papier ou de carton (2) dans lequel un support de feuille est déplacé en dessous d'une trémie (3) fournissant un revêtement liquide simple ou multicouche sous la forme d'un voile à écoulement libre (4) touchant le support selon une ligne de mouillage dynamique (7) et un déflecteur d'air (9) étant disposé en amont de la ligne de mouillage dynamique (7) par rapport au sens de déplacement de la feuille (2), la ligne de mouillage dynamique (7) du voile de couchage (4) sur la feuille (2) étant orientée généralement perpendiculaire au sens de déplacement de la feuille (2), en fournissant sensiblement la même pression d'air sur une partie essentielle du voile de couchage (4) sur ses faces avant et arrière par rapport au sens de déplacement de la feuille (2), en fournissant un premier flux d'air (17) en amont de la ligne de mouillage (7) dans lequel l'air circule sur une longueur substantielle le long du rideau à écoulement libre, et en évacuant l'air à partir d'un endroit plus en amont par une sortie d'air (20) pour que l'air proche de la ligne de mouillage dynamique (7) se déplace contre le sens de déplacement de la feuille (2) et une couche d'air limite (28) entraîné par la feuille (2), caractérisé en ce que un second flux d'air (22) est amené à proximité de la ligne de mouillage (7), et en ce que le premier (17) et le second (22) flux d'air sont évacués par un premier système d'aspiration d'air (19, 13) et l'air limite (28) est évacué par un second système d'aspiration d'air (29, 30).
  2. Appareil de couchage par voile d'une feuille continue de papier ou de carton (2) comportant une trémie (3) pour fournir un voile à écoulement libre (4) de liquide de revêtement, un déflecteur d'air (9) ménageant un petit espace (10) entre la feuille (2) et le déflecteur d'air (9), une première ouverture d'amenée d'air (25) s'étendant généralement sur la largeur de la feuille (2) et fournissant un premier flux d'air (17) dans la zone de la ligne de mouillage dynamique (7) où le rideau de couchage liquide (4) touche la feuille (2), des moyens d'aspiration ou de vide (19, 13) reliés au déflecteur d'air (9) ménagés pour enlever l'air et des moyens (27) pour l'enlèvement d'une couche d'air limite (28), caractérisé en ce que l'ensemble comprend un second flux d'air (22) avec une sortie d'air (20) à proximité de la ligne de mouillage (7), et en ce qu'il comporte un premier système d'aspiration d'air (19, 13) pour le premier et le second flux d'air (17, 22) et des seconds moyens d'aspiration de l'air (27, 2,9 30) pour la couche d'air limite (28).
  3. Appareil selon la revendication 2,
    caractérisé en ce que un premier élément de guidage (21a) dirige le second flux d'air (22) vers la ligne de mouillage (7) et un second élément de guidage (21b) est disposé entre le second flux d'air (22) et un canal à vide (19) des premiers moyens d'aspiration.
  4. Appareil selon la revendication 3,
    caractérisé en ce que le second élément de guidage (21b) avec un bord (11) définit une buse entre la sortie d'air (20) du second flux d'air (22), les premiers moyens d'aspiration et la feuille déplacée (2).
  5. Appareil selon la revendication 3 ou 4,
    caractérisé en ce que, au moins partiellement dans la zone de la ligne de mouillage (7), les premier et second éléments de guidage (21a, 21b) sont des plaques s'étendant en direction transversale sur la largeur de la feuille (2) devant être revêtue.
  6. Appareil selon la revendication 4,
    caractérisé en ce que le bord (11) formant la fente est à une distance d'environ 1 à 10 mm, de préférence 3 à 5 mm, de la feuille (2).
  7. Appareil selon la revendication 4,
    caractérisé en ce que le second élément de guidage (21b) est mobile pour modifier la distance du bord (11) à la feuille (2).
  8. Appareil selon la revendication 2,
    caractérisé en ce que, comme les seconds moyens d'aspiration, des moyens (27) sont disposés en aval des premiers moyens d'aspiration d'air (19, 13).
  9. Appareil selon la revendication 8,
    caractérisé en ce que les moyens sont complétés par un canal d'aspiration (29) s'étendant à travers la largeur transversale machine de la feuille.
  10. Appareil selon la revendication 2,
    caractérisé en ce que, entre les premiers moyens d'aspiration de l'air (19, 13) et les seconds moyens d'aspiration de l'air (27, 29, 30), sont disposés des moyens de soufflage support de feuille (31).
  11. Appareil selon la revendication 10,
    caractérisé en ce que les moyens de soufflage support de feuille (31) sont une soufflure sans contact avec un canal de soufflage (32) s'étendant à travers la largeur transversale machine de la feuille (2).
  12. Appareil selon la revendication 11,
    caractérisé en ce que le canal de soufflage (32) des moyens de soufflage support de feuille (31) est dirigé en faisant en angle contre le sens de déplacement de la feuille (2).
  13. Appareil selon les revendications 9 et 12,
    caractérisé en ce que une connexion d'air est ménagée entre le canal de soufflage (32) et le canal d'aspiration (29).
  14. Appareil selon la revendication 2,
    caractérisé en ce que la trémie (3) et le déflecteur d'air (9) sont des parties distinctes et en ce qu'une ouverture (25) entre la trémie (3) et le déflecteur (9) est ménagée pour le premier flux d'air (17).
  15. Appareil selon la revendication 14,
    caractérisé en ce que une plaque déflectrice de guidage (24) est ménagée pour diriger le premier flux d'air (17) le long du voile à écoulements libre.
  16. Appareil selon les revendications 14 et 15,
    caractérisé en ce que la plaque déflectrice de guidage (24) est mobile pour modifier la largeur de l'ouverture (25) pour le premier flux d'air (17) .
EP02027834A 2002-12-12 2002-12-12 Méthode et appareil pour revêtement au rideau Expired - Lifetime EP1428582B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP02027834A EP1428582B1 (fr) 2002-12-12 2002-12-12 Méthode et appareil pour revêtement au rideau
DE60209434T DE60209434T2 (de) 2002-12-12 2002-12-12 Verfahren und Vorrichtung zum Vorhang- Beschichten
AT02027834T ATE318656T1 (de) 2002-12-12 2002-12-12 Verfahren und vorrichtung zum vorhang- beschichten

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP02027834A EP1428582B1 (fr) 2002-12-12 2002-12-12 Méthode et appareil pour revêtement au rideau

Publications (2)

Publication Number Publication Date
EP1428582A1 EP1428582A1 (fr) 2004-06-16
EP1428582B1 true EP1428582B1 (fr) 2006-03-01

Family

ID=32319588

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02027834A Expired - Lifetime EP1428582B1 (fr) 2002-12-12 2002-12-12 Méthode et appareil pour revêtement au rideau

Country Status (3)

Country Link
EP (1) EP1428582B1 (fr)
AT (1) ATE318656T1 (fr)
DE (1) DE60209434T2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009046095A1 (de) 2009-10-28 2011-05-05 Metso Paper, Inc. Arrangement und Verfahren zur Kontrolle von den in der Florstreichvorrichtung mit der Bahn geführten Luftströmungen

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004056271A1 (de) * 2004-11-22 2006-05-24 Basf Ag Anordnung und Verfahren zur Vorhangbeschichtung bewegter Substrate
DE102006036450A1 (de) * 2006-08-04 2008-02-07 Voith Patent Gmbh Auftragsvorrichtung
DE102017101373B4 (de) 2017-01-25 2022-02-03 Voith Patent Gmbh Vorhang-Auftragswerk und Verfahren zum Auftragen eines Auftragsmediums
DE102017124280A1 (de) * 2017-10-18 2019-04-18 Voith Patent Gmbh Vorhang-Auftragswerk und Verfahren zum Auftragen eines Auftragsmediums

Family Cites Families (7)

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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
DE69026097T2 (de) 1990-12-12 1996-10-02 Agfa Gevaert Nv Vorhangbeschichter
DE59409768D1 (de) 1994-09-27 2001-07-05 Ilford Imaging Ch Gmbh Verfahren und Vorrichtung zur Vorhangbeschichtung eines bewegten Trägers
US5976630A (en) 1997-09-29 1999-11-02 Eastman Kodak Company Method and apparatus for curtain coating
EP0906789B1 (fr) 1997-10-03 2001-09-19 TSE Troller Schweizer Engineering AG Procédé et appareil pour le revêtement par rideau d'un support en movement
FI115295B (fi) 1999-09-01 2005-04-15 Metso Paper Inc Verhopäällystin ja verhopäällystysmenetelmä
US6416690B1 (en) 2000-02-16 2002-07-09 Zms, Llc Precision composite lens

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009046095A1 (de) 2009-10-28 2011-05-05 Metso Paper, Inc. Arrangement und Verfahren zur Kontrolle von den in der Florstreichvorrichtung mit der Bahn geführten Luftströmungen
DE102009046095B4 (de) * 2009-10-28 2016-07-28 Valmet Technologies, Inc. Anordnung zur Kontrolle von den in der Florstreichvorrichtung mit der Bahn geführten Luftströmungen

Also Published As

Publication number Publication date
EP1428582A1 (fr) 2004-06-16
DE60209434T2 (de) 2006-10-19
DE60209434D1 (de) 2006-04-27
ATE318656T1 (de) 2006-03-15

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