EP3464724B1 - Unité d'enduction à rideau - Google Patents

Unité d'enduction à rideau Download PDF

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Publication number
EP3464724B1
EP3464724B1 EP17722789.9A EP17722789A EP3464724B1 EP 3464724 B1 EP3464724 B1 EP 3464724B1 EP 17722789 A EP17722789 A EP 17722789A EP 3464724 B1 EP3464724 B1 EP 3464724B1
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EP
European Patent Office
Prior art keywords
medium
application head
tear
application
edge
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.)
Active
Application number
EP17722789.9A
Other languages
German (de)
English (en)
Other versions
EP3464724A1 (fr
Inventor
Tadashi Sasa
Toshihiro Katano
Akio Hirano
Hiroyuki Kohno
Christoph Henninger
Uwe Fröhlich
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
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Publication date
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Publication of EP3464724A1 publication Critical patent/EP3464724A1/fr
Application granted granted Critical
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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
    • B05C5/005—Curtain 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
    • 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
    • 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
    • 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
    • B05D2252/00—Sheets
    • B05D2252/02—Sheets of indefinite length
    • 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
    • B05D3/04—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 exposure to gases
    • B05D3/0406—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 exposure to gases the gas being air
    • B05D3/042—Directing or stopping the fluid to be coated with air

Definitions

  • the invention relates to an application head for a curtain application unit for coating a running fibrous web, a curtain application unit for coating a running fibrous web and a method for coating a running fibrous web by means of a curtain application unit.
  • Curtain coating systems for coating a moving material web with at least one liquid and/or pasty application medium generally have an application head which comprises at least one tear-off edge extending substantially across the width of the application head, at which the application medium leaves the application head in the form of a freely falling curtain.
  • curtain coating systems are often used in paper or B&P production to achieve a particularly high coating quality with minimal use of expensive coating color. Curtain coating systems are therefore often used to produce the top layer, the so-called cover layer. Since the cover layer of the paper or B&P web is the layer that determines the external appearance of the paper or cardboard, particularly high quality requirements are placed on the cover layer.
  • curtain coating units have the disadvantage that they are particularly sensitive to environmental influences. For example, air currents, fluctuations in temperature and/or humidity have a particularly negative effect on stable operation of curtain coating units. Since coating units are generally often located close to drying devices, such as cylinder drying devices and/or infrared drying devices, such coating units are often operated in an environment with high ambient temperature combined with high humidity. In order to protect the coating color from In order to degas curtain coating systems, i.e. to ensure that the coating color can emerge from the application head of the curtain coating system without air bubbles, vacuum degassing devices are also used, which must be operated at a low temperature to prevent the coating color from boiling.
  • curtain coating systems are usually operated in an enclosure that surrounds them and is air-conditioned.
  • the object is achieved by an application head according to claim 1, by a curtain application device according to claim 11 and by a method according to claim 14. Because at least one flushing device is provided according to the invention, by means of which at least one of the at least one tear-off edge can be or is exposed to a flowing gaseous flushing medium, it is achieved that little or no ambient air can collect in the area of the tear-off edge, which can condense on the tear-off edge. For this reason, air conditioning can be completely dispensed with or only very simple air conditioning can be used.
  • the application head comprises at least one transverse distribution chamber and a nozzle gap connected thereto with an outlet opening such that the liquid coming from the transverse distribution chamber via the nozzle gap to the outlet opening
  • Application medium leaves the application head at the outlet opening, wherein the at least one tear-off edge is formed by at least a part of the outlet opening.
  • the outlet opening can provide a first and a second tear-off edge, wherein when the application head is used as intended, the first tear-off edge is arranged at the front and the second tear-off edge is arranged at the rear when viewed in the direction of travel of the material web.
  • a preferred development of the invention provides a first and/or a second rinsing device which is or are arranged in such a way that when the application head is used as intended, viewed in the running direction of the material web, the first rinsing device applies the rinsing medium to the first tear-off edge from the front and the second rinsing device applies the rinsing medium to the second tear-off edge from the rear.
  • the application head comprises at least one transverse distribution chamber and a nozzle gap connected to it with an outlet opening as well as an adjoining sliding surface to which the tear-off edge in turn adjoins such that, viewed in the flow direction of the application medium, the application medium coming from the transverse distribution chamber via the nozzle gap and the outlet opening flows after the outlet opening over the sliding surface to the tear-off edge and leaves the application head at the tear-off edge.
  • the at least one flushing device can be arranged outside the nozzle gap.
  • the at least one flushing device is designed and arranged such that the flow of the gaseous flushing medium is directed in the direction of the freely falling curtain.
  • the application head comprises a housing block, in particular made of a metallic material, in which the transverse distribution chamber and the nozzle gap are arranged, wherein the housing block is at least partially surrounded by a
  • the outer cladding can, for example, be provided or comprise at least in sections by at least one flat and/or curved sheet metal or by at least one flat and/or curved plastic plate such as a Plexiglas plate.
  • the outer cladding is thermally decoupled from the housing block at least in sections by the thermally insulating layer.
  • the thermally insulating layer is arranged at least in sections between the outer cladding and the housing block.
  • the outer cladding can also be formed, at least in sections, by a thermally insulating layer.
  • the outer cladding is arranged and designed, at least in the region of the tear-off edge, in such a way that the free fall of the curtain is not impaired.
  • the housing block comprises a first and a second housing block part and the transverse distribution chamber and the nozzle gap are formed by a cavity formed between the two housing block parts.
  • the two housing block parts are connected to one another by connecting means, in particular screws.
  • first housing block part comprises a first nozzle lip providing the first tear-off edge and the second housing block part comprises a second nozzle lip providing the second tear-off edge, which are relatively are adjustable relative to one another in such a way that the width of the nozzle gap in the area of the outlet opening can be individually adjusted in the transverse direction of the application head, and thus in the transverse direction of the fibrous web.
  • This design makes it particularly easy to construct the application head according to the invention with an adjustable nozzle gap.
  • thermally insulating layer can be constructed.
  • the thermally insulating layer comprises a foam material and/or a honeycomb structure and/or glass wool and/or mineral wool or is formed by one or more of the foregoing.
  • the thermally insulating layer is formed by a gaseous insulation medium which is arranged or guided in a gap between the housing block and the outer cladding, wherein the gap in the area of the tear-off edge is in the range 0.5 mm - 50 mm, preferably 2-10 mm.
  • the gaseous insulation medium is provided at least partially, preferably completely, by the flowing gaseous flushing medium.
  • insulation of the housing block and flushing of at least one tear-off edge can be provided in a particularly simple manner.
  • the gaseous insulation medium and/or the gaseous flushing medium is in particular air.
  • the application head has a top side and a bottom side and the outlet opening is arranged on the bottom side.
  • the flushing medium which at least partially provides the insulation medium, flows in a flow direction directed from the top side to the bottom side, in particular from the top side to the bottom side, to the region of the tear-off edge.
  • a curtain coating device for coating a running material web with at least a liquid and/or pasty medium which is equipped with at least one application head according to the invention.
  • the curtain applicator preferably has means for adjusting the temperature of the flushing medium and/or the application medium so that the temperature of the flushing medium is between the ambient temperature and the temperature of the application medium.
  • the means are designed in particular to adjust the temperature of the flushing medium in the range of 0.4 to 1.5 times, preferably 0.6 to 1.5 times, the ambient temperature.
  • the means for adjusting or coordinating the temperature of the flushing medium and/or the temperature of the application medium can in particular comprise heating and/or cooling devices and temperature measuring devices by means of which the temperature of the flushing medium and the application medium can be measured and each set to a target value.
  • the means preferably also comprise a control and/or regulating device with which the heating and/or cooling devices are automatically regulated and/or controlled on the basis of the measured temperatures of the flushing medium and the application medium as well as the target temperatures for the flushing medium and the application medium.
  • the curtain applicator comprises means for dehumidifying the rinsing medium.
  • the invention makes it possible in particular for the curtain application unit to have no housing.
  • the curtain coating unit has an enclosure, although the enclosure is not air-conditioned.
  • the housing is designed in particular in such a way that it surrounds at least the application head and the area where the curtain of application medium meets the fibrous web.
  • a method for coating a moving material web with at least one liquid and/or pasty application medium by means of a curtain application unit comprises at least one application head according to the invention, namely which comprises at least one tear-off edge extending substantially across its width, at which the application medium leaves the application head in the form of a freely falling curtain and subsequently enters the material web, wherein the region of at least one of the at least one tear-off edge is exposed to a flowing gaseous flushing medium.
  • a preferred embodiment of the method provides that the temperature of the flushing medium is kept between the temperature of the environment and the temperature of the application medium.
  • the temperature of the flushing medium is in the range from 15°C to 55°C, that of the application medium in the range from 18°C to 40°C and the temperature of the environment is less than 65°C.
  • the temperature of the flushing medium preferably deviates from the temperature of the application medium by a maximum of 7°C, particularly preferably by a maximum of 5°C.
  • the temperature of the flushing medium is lower than the temperature of the application medium by a maximum of 7°C, particularly preferably by a maximum of 5°C.
  • the Figure 1 shows - in a cross-sectional view in a plane parallel to the web running direction MD and perpendicular to the web cross direction CD (CD extends perpendicular to the plane of the drawing of the Figures 1-7 ) - a first embodiment of an application head 1 according to the invention for producing a single-layer, freely falling curtain 2 of a liquid and/or pasty application medium for coating a moving material web.
  • the application head 1 has a transverse distribution chamber 3 and a nozzle gap 4 connected thereto with an outlet opening 5 such that the application medium coming from the transverse distribution chamber 3 via the nozzle gap 4 to the outlet opening 5 leaves the application head at the outlet opening 5.
  • the outlet opening 5 provides a front tear-off edge 6 viewed in the web running direction MD and a rear tear-off edge 7 viewed in the web running direction MD.
  • the application head 1 comprises a first flushing device and a second flushing device 9 which are designed and arranged such that when the application head is used as intended, viewed in the direction of travel of the material web, the first flushing device 8 applies a flowing flushing medium 13 (dash-dotted line with arrow) to the first tear-off edge 6 from the front and the second flushing device 9 applies a flowing flushing medium 14 (dash-dotted line with arrow) to the second tear-off edge 7 from the rear.
  • the two flushing devices 8, 9 are arranged outside the nozzle gap 4. In the present case, each of the two flushing devices provides a flushing medium in the form of air.
  • the application head 1 comprises a housing block made of a metallic material in which the transverse distribution chamber 3 and the nozzle gap 4 are arranged.
  • the housing block comprises a first housing block part 10 (in the present embodiment, front housing block part 10) and a second housing block part 11 (in the present embodiment, rear housing block part 11), wherein the transverse distribution chamber 3 and the nozzle gap 4 are formed by a cavity formed between the two housing block parts 10, 11.
  • the first housing block part 10 comprises a first nozzle lip 10.1, which provides the first tear-off edge 6 in the region of the outlet opening 5 of the nozzle gap 4.
  • the second housing block part 11 comprises a second nozzle lip 11.1, which provides the second tear-off edge 7 in the region of the outlet opening 5 of the nozzle gap 4.
  • the two nozzle lips 10.1 and 11.1 are adjustable relative to one another in such a way that the width of the nozzle gap 4 in the region of the outlet opening 5 can be individually adjusted in the transverse direction of the application head.
  • the housing block is surrounded in sections by an outer panel 12.1, 12.2, which comes into contact with the environment.
  • the outer panel 12.1, 12.2 has a front part of the outer panel 12.1 in the direction of web travel MD in the form of a bent sheet and a rear part of the outer panel 12.2 in the form of a bent sheet in the direction of web travel MD.
  • the outer panel 12.1, 12.2 is arranged and designed in the area of the tear-off edges 6, 7 in such a way that the free fall of the curtain 2 is not impaired by it.
  • the outer cladding 12 is thermally decoupled from the housing block 10, 11 at least in sections by a thermally insulating layer.
  • the thermally insulating layer between the front part of the outer cladding 12.1 and the front housing block part 10 is formed by a gaseous insulating medium, which is guided in a gap between the front housing block part 10 and the front part of the outer cladding 12.1 and is flushed by the flowing gaseous flushing medium 13 from the first Flushing device 8 is provided.
  • the Figure 1 upper part of the gap between the rear housing block part 11 and the rear part of the outer panel 12.2 is formed by a foam material.
  • the flushing medium flows in a flow direction from the top to the bottom to the two separation edges 6, 7.
  • the Figure 1b shows a variant of the Figure 1 shown application head.
  • Both flushing devices 8, 9 are mounted in the lower area of the nozzle head.
  • Both the upper part of the gap between the rear housing block part 11 and the rear part of the outer panel, 12.2, and the upper part of the gap between the front housing block part 10 and the front part of the outer panel, 12.1 are completely or at least partially filled with a foam material.
  • the Figure 2 shows a second embodiment of an application head 1 according to the invention for producing a single-layer free-falling curtain 2.
  • the order head of the Figure 2 differs from that in the Figure 1 shown application head is essentially due to the fact that the application head Figure 2 both flushing devices 8, 9 are arranged in the lower part of the application head 1, ie at the level of the nozzle lips 10.1 and 11.1 and the outer cladding 12.1 and 12.2 in front of and behind the curtain in the direction of the freely falling curtain 2 for up to 100 Millimeters over the two tear-off edges 6, 7 at the outlet opening 5, whereby the freely falling curtain 2 is shielded from disruptive environmental influences such as air currents.
  • the front part of the outer panel 12.1 comprises a deflection plate 12.1.1.
  • the rear part of the outer panel 12.2 comprises a deflection plate 12.2.2, whereby the flowing flushing medium 14 provided by the second flushing device 9 is directed to the second tear-off edge 7.
  • thermally insulating layer between the front part of the outer cladding 12.1 and the housing block 10, 11 as well as the rear part of the outer cladding 12.2 and the housing block 10, 11 is provided by air which is not provided by the flushing medium 13, 14.
  • air which is not provided by the flushing medium 13, 14.
  • another thermally insulating layer such as foam, mineral wool, etc. is used.
  • the Figure 3 shows a third embodiment of an application head 1 according to the invention for producing a single-layer free-falling curtain 2.
  • the order head 1 of the Figure 3 differs from that in the Figure 1 shown application head essentially in that the thermally insulating layer between the rear part of the outer cladding 12.2 and the rear housing block part 11 is also formed by the gaseous insulation medium which is guided in the gap between the rear housing block part 11 and the rear part of the outer cladding 12.2 and is provided by the flowing gaseous flushing medium 14 from the second flushing device 9.
  • the Figure 4 shows a fourth embodiment of an application head 1 according to the invention for producing a single-layer free-falling curtain 2.
  • the order head 1 of the Figure 4 differs from that in the Figure 3 shown application head essentially in that no outer covering 12.1 and 12.2 is provided.
  • the housing block 10, 11 is only surrounded by the thermally insulating layer, which is connected to the environment comes into contact, wherein the thermally insulating layer surrounding the front housing block part 10 is provided by the flowing gaseous flushing medium 13 from the first flushing device 8 and the thermally insulating layer surrounding the rear housing block part 11 is provided by the flowing gaseous flushing medium 14 from the second flushing device 9.
  • the Figure 5 shows a fifth embodiment of an application head 1 according to the invention for producing a single-layer free-falling curtain 2.
  • the order head 1 of the Figure 5 has a transverse distribution chamber 3 and a nozzle gap 4 connected to it with an outlet opening 5 as well as an adjoining sliding surface 17 to which a tear-off edge 16 is connected in such a way that, viewed in the flow direction of the application medium, the application medium coming from the transverse distribution chamber 3 via the nozzle gap 4 and the outlet opening 5 flows after the outlet opening 5 via the sliding surface 17 to the tear-off edge 16 and leaves the application head 1 at the tear-off edge 16.
  • the sliding surface 17 is provided by a sliding surface block 15 arranged on the front housing block part 10.
  • Two flushing devices 8, 9 are provided on the separation edge 16, by means of which the separation edge 16 can be exposed to the flowing gaseous flushing medium 13, 14.
  • the Figure 6 shows an embodiment of an application head 1 according to the invention for producing a multi-layered free-falling curtain 2'.
  • the order head 1 of the Figure 6 differs from that in the Figure 3 shown application head essentially in that the housing block has a housing block middle part 18 in addition to a front and rear housing block part 10', 11', as well as two transverse distribution chambers 3.1 and 3.2, each with an associated nozzle gap 4.1, 4.2, which meet at the outlet opening 5 to produce a two-layer free-falling curtain 2'.
  • the loading of the two tear-off edges 6, 7 as well as the thermal insulation of the housing block 10', 11', 18 is analogous to the embodiment of the Figure 3 solved, namely loading the first Tear-off edge 6 with the flushing medium 13 provided by the first flushing device 8 and exposure of the second tear-off edge 7 with the flushing medium 14 provided by the second flushing device 9, wherein the two flushing media 13, 14 are each guided from the upper part of the housing block 10', 11', 18 in the gap between the outer cladding 12.1 and 12.2 in a flow direction directed from the top to the bottom.
  • the Figure 7 shows an embodiment of a curtain coating unit 100 according to the invention for coating a running paper web with a liquid and/or pasty application medium in the form of a freely falling curtain 2.
  • an application head as in the Figure 3 shown. It should be noted in this context that instead of the application head, the Figure 3 any other application head according to the invention could also be used.
  • the curtain coating unit 100 has rollers 102, 103 over which the paper web 101 is guided essentially horizontally during the coating.
  • the application head 1 and the point at which the freely falling curtain 2 meets the paper web 101 are shielded from environmental influences by a housing 104, whereby the housing is not air-conditioned.
  • the curtain discharge device 100 has means for adjusting the temperature of the flushing medium 13, 14 and the application medium 2 such that the temperature of the flushing medium 13, 14 lies between the temperature of the environment and the temperature of the application medium 2.
  • the means comprise a temperature sensor 105 for measuring the temperature of the flushing medium 13, 14 and a temperature sensor 106 for measuring the temperature of the application medium 2 in the area of the transverse distribution chamber 3.
  • the means comprise a heating and/or cooling device 107 for increasing and/or reducing the temperature of the flushing medium 13, 14 and a heating and/or cooling device 108 for increasing and/or reducing the temperature of the application medium 2.
  • the means comprise a control and/or regulating device 110 with which automatically on the basis of the measured temperatures of the flushing medium 13, 14 and the application medium 2 as well as the target temperatures for the flushing medium 13, 14 and the application medium 2, the two heating and/or cooling devices 108, 109 can be regulated and/or controlled.
  • the respective temperature can be automatically adjusted and/or controlled by means of the respective assigned heating and/or cooling device 107, 108 using the control and regulation unit 110.

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Claims (15)

  1. Tête d'application pour un dispositif d'application de rideau pour l'enduction d'une bande de matériau en mouvement avec au moins un milieu d'application liquide et/ou pâteux, la tête d'application comprenant au moins un bord de rupture s'étendant essentiellement sur la largeur de la tête d'application, au niveau duquel le milieu d'application quitte la tête d'application sous la forme d'un rideau tombant librement, dans laquelle au moins un dispositif de rinçage est prévu, au moyen duquel au moins l'une des au moins une arête d'arrachement peut être soumise à un fluide de rinçage gazeux en écoulement, caractérisé en ce que la tête d'application comprend un bloc de boîtier, en particulier en un matériau métallique, dans lequel sont disposées la chambre de distribution transversale et la fente de buse, et le bloc de boîtier est entouré au moins par sections par un revêtement extérieur et une couche thermiquement isolante qui vient en contact avec l'environnement, le revêtement extérieur étant découplé thermiquement du bloc de boîtier au moins par sections par la couche thermiquement isolante.
  2. Tête d'application selon la revendication 1, caractérisée en ce que la tête d'application comprend au moins une chambre de distribution transversale ainsi qu'une fente de buse reliée à celle-ci avec une ouverture de sortie de telle sorte que le milieu d'application venant de la chambre de distribution transversale via la fente de buse vers l'ouverture de sortie quitte la tête d'application à l'ouverture de sortie, l'au moins une arête de rupture étant formée par au moins une partie de l'ouverture de sortie.
  3. Tête d'application selon la revendication 2, caractérisée en ce que l'ouverture de sortie met à disposition une première et une deuxième arête de déchirure, la première arête de déchirure étant disposée à l'avant et la deuxième arête de déchirure à l'arrière lorsque la tête d'application est utilisée conformément aux prescriptions dans le sens de déplacement de la bande de matériau, un premier et un deuxième dispositif de rinçage étant prévus et disposés de telle sorte que, lors d'une utilisation conforme de la tête d'application, considérée dans le sens de déplacement de la bande de matériau, le premier dispositif de rinçage alimente le premier bord de déchirure depuis l'avant avec le fluide de rinçage et le deuxième dispositif de rinçage alimente le deuxième bord de déchirure depuis l'arrière avec le fluide de rinçage.
  4. Tête d'application selon la revendication 1, caractérisée en ce que la tête d'application comprend au moins une chambre de distribution transversale et une fente de buse reliée à celle-ci avec une ouverture de sortie ainsi qu'une surface de glissement s'y raccordant, à laquelle se raccorde à son tour l'arête de rupture, de telle sorte que, vu dans le sens d'écoulement du fluide d'application, le fluide d'application venant de la chambre de distribution transversale par la fente de buse et l'ouverture de sortie s'écoule après l'ouverture de sortie par la surface de glissement vers l'arête de rupture et quitte la tête d'application sur l'arête de rupture.
  5. Tête d'application selon l'une des revendications précédentes, caractérisée en ce que le au moins un dispositif de rinçage est disposé à l'extérieur de la fente de buse et/ou en ce que le au moins un dispositif de rinçage est conçu et disposé de telle sorte que l'écoulement du milieu de rinçage gazeux est dirigé en direction du rideau en chute libre.
  6. Tête d'application selon l'une des revendications précédentes, caractérisée en ce que le bloc de boîtier comprend une première et une deuxième partie de bloc de boîtier et en ce que la chambre de distribution transversale et la fente de buse sont formées par un espace creux formé entre les deux parties de bloc de boîtier.
  7. Tête d'application selon la revendication 6, caractérisée en ce que la première partie de bloc de boîtier comprend une première lèvre de buse fournissant le premier bord d'arrachement et la deuxième partie de bloc de boîtier comprend une deuxième lèvre de buse fournissant le deuxième bord d'arrachement, qui sont réglables l'une par rapport à l'autre de telle sorte que la largeur de la fente de buse dans la zone de l'ouverture de sortie dans la direction transversale de la tête d'application peut être réglée individuellement.
  8. Tête d'application selon l'une des revendications précédentes, caractérisée en ce que la couche d'isolation thermique est formée par un milieu isolant gazeux qui est disposé ou guidé dans un interstice entre le bloc de boîtier et le revêtement extérieur, l'interstice étant en particulier de l'ordre de 0,5 mm à 50 mm, de préférence de 2 à 10 mm, dans la zone du bord de décollement.
  9. Tête d'application selon la revendication 8, caractérisée en ce que le milieu d'isolation gazeux est fourni au moins en partie par le milieu de rinçage gazeux qui s'écoule.
  10. Tête d'application selon l'une des revendications précédentes, caractérisée en ce que la tête d'application a une face supérieure et une face inférieure et l'ouverture de sortie est disposée dans la zone de la face inférieure, le fluide de rinçage fournissant au moins partiellement le fluide isolant s'écoulant dans une direction d'écoulement dirigée de la face supérieure vers la face inférieure, en particulier de la face supérieure vers la face inférieure, vers la zone du bord de décollement.
  11. Dispositif d'application de rideau pour l'enduction d'une bande de matériau en mouvement avec au moins un milieu liquide et/ou pâteux, avec une tête d'application selon l'une des revendications 1 à 10.
  12. Mécanisme d'application de rideau selon la revendication 11, caractérisé en ce que des moyens sont prévus pour ajuster la température du milieu de rinçage et/ou du milieu d'application de telle sorte que la température du milieu de rinçage se situe entre la température de l'environnement et la température du milieu d'application, en particulier en ce que les moyens sont conçus pour ajuster la température du milieu de rinçage dans la plage de 0,4 à 1,5 fois la température de l'environnement.
  13. Mécanisme d'application de rideau selon l'une quelconque des revendications 11 à 12 précédentes, caractérisé en ce que le mécanisme d'application de rideau n'a pas d'enceinte entourant au moins partiellement la tête d'application, ou en ce que le mécanisme d'application de rideau a une enceinte entourant au moins partiellement la tête d'application, l'enceinte n'étant pas climatisée.
  14. Procédé d'enduction d'une bande de matériau en mouvement avec au moins un milieu d'enduction liquide et/ou pâteux au moyen d'un dispositif d'enduction au rideau qui comprend au moins une tête d'enduction, selon l'une des revendications 1 à 10, qui comprend au moins une arête de rupture s'étendant essentiellement sur sa largeur, au niveau de laquelle le milieu d'enduction quitte la tête d'enduction sous la forme d'un rideau tombant librement et entre ensuite sur la bande de matériau, caractérisé en ce que la zone d'au moins une de l'au moins une arête de rupture est soumise à un milieu de rinçage gazeux en écoulement.
  15. Procédé selon la revendication 14, caractérisé en ce que la température du milieu de rinçage se situe entre la température de l'environnement et la température du milieu d'application et/ou en ce que la température du milieu de rinçage se situe dans la plage de 15°C à 55°C, celle du milieu d'application dans la plage de 18°C à 40°C et la température de l'environnement est inférieure à 65°C.
EP17722789.9A 2016-05-30 2017-05-11 Unité d'enduction à rideau Active EP3464724B1 (fr)

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DE102016209336.3A DE102016209336B4 (de) 2016-05-30 2016-05-30 Vorhangauftragswerk
PCT/EP2017/061287 WO2017207236A1 (fr) 2016-05-30 2017-05-11 Unité d'enduction à rideau

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CN110080909B (zh) * 2018-12-28 2020-04-28 湖北航天技术研究院总体设计所 一种固体火箭发动机的喷管
DE102022134304A1 (de) 2022-12-21 2024-06-27 Voith Patent Gmbh Auftragsvorrichtung und Verfahren

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US11833540B2 (en) 2023-12-05
US20200316636A1 (en) 2020-10-08
FI3464724T3 (fi) 2024-07-04
WO2017207236A1 (fr) 2017-12-07
DE102016209336B4 (de) 2021-08-05
CN109312541A (zh) 2019-02-05
EP3464724A1 (fr) 2019-04-10

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