WO2022008129A1 - Système de revêtement et procédé de revêtement - Google Patents

Système de revêtement et procédé de revêtement Download PDF

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Publication number
WO2022008129A1
WO2022008129A1 PCT/EP2021/063470 EP2021063470W WO2022008129A1 WO 2022008129 A1 WO2022008129 A1 WO 2022008129A1 EP 2021063470 W EP2021063470 W EP 2021063470W WO 2022008129 A1 WO2022008129 A1 WO 2022008129A1
Authority
WO
WIPO (PCT)
Prior art keywords
roller
coating
coating medium
web
applicator
Prior art date
Application number
PCT/EP2021/063470
Other languages
German (de)
English (en)
Inventor
Christoph Henninger
Franziska FERRER
Tobias KOHLHAGEN
Harald Hess
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
Priority to EP21728850.5A priority Critical patent/EP4178781A1/fr
Publication of WO2022008129A1 publication Critical patent/WO2022008129A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
    • B29C48/154—Coating solid articles, i.e. non-hollow articles
    • 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
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
    • B05C1/0826—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being a web or sheets
    • 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
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
    • B05C1/0826—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being a web or sheets
    • B05C1/083—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being a web or sheets being passed between the coating roller and one or more backing rollers
    • 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
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
    • B05C1/0873—Controlling means responsive to conditions of the liquid or other fluent material, of the ambient medium, of the roller or of the work
    • 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
    • B05C9/04—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 to opposite sides of the work
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/14—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the particular extruding conditions, e.g. in a modified atmosphere or by using vibration
    • B29C48/141—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the particular extruding conditions, e.g. in a modified atmosphere or by using vibration extruding in a clean room
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/14—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the particular extruding conditions, e.g. in a modified atmosphere or by using vibration
    • B29C48/147—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the particular extruding conditions, e.g. in a modified atmosphere or by using vibration after the die nozzle
    • B29C48/1476—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the particular extruding conditions, e.g. in a modified atmosphere or by using vibration after the die nozzle at a conveyor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/911—Cooling
    • B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
    • B29C48/914—Cooling of flat articles, e.g. using specially adapted supporting means cooling drums
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/911—Cooling
    • B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
    • B29C48/915—Cooling of flat articles, e.g. using specially adapted supporting means with means for improving the adhesion to the supporting means
    • B29C48/917—Cooling of flat articles, e.g. using specially adapted supporting means with means for improving the adhesion to the supporting means by applying pressurised gas to the surface of the flat article
    • 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
    • D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
    • D21H23/56—Rolls

Definitions

  • the invention relates to a coating system for coating a moving web according to the preamble of claim 1 and a method for coating according to the preamble of claim 13.
  • the coating of running webs, especially paper webs, is a known process.
  • Coating with a starch solution in particular has a long tradition, for example to positively influence the surface quality or strength properties of the web.
  • the starch solution does not essentially remain on the surface of the web but penetrates as deeply as possible into the structure of the web.
  • Starch is usually applied to a paper or cardboard web using a film press.
  • DE 102018 100 924 proposes increasing the roller hardness for one or two of the application rollers, the flattening of the roller surface and thereby obtaining a comparatively hard treatment gap.
  • this effect of the hard treatment gap is not sufficient.
  • a possibility to further increase the penetration of the starch would be desirable here.
  • a further object of the invention is to be able to adapt the penetration behavior of the coating medium quickly and specifically in terms of time and space.
  • a coating system for coating a running web, in particular a paper or cardboard web, with a coating medium which comprises a roller and an application head for applying the coating medium to the roller.
  • a treatment gap is provided for transferring the coating medium from the roller to the web, the treatment gap being formed by the roller and a counter-element.
  • an applicator is arranged between the application head and the treatment gap, viewed in the direction of rotation of the roller, in order to apply steam and/or air to the coating medium on the roller.
  • the applicator is arranged between the application head and the treatment gap is to be understood in such a way that at least the point at which the vapor or the air impinges on the coating medium is arranged at an intermediate point between the application head and the treatment gap. It is advantageous that the applicator is also located at least partially between the application head and the treatment gap.
  • the invention should also include such embodiments in which the applicator is attached, for example, to the applicator head or above it, and from there the roller is acted upon by air and/or steam at an intermediate point.
  • the vapor and/or air is applied to the coating medium while it is on the roller as described.
  • the loading therefore takes place in particular in an area between the application head and the treatment gap.
  • a distance is provided between the area in which air and/or steam impinges on the coating medium and the treatment gap.
  • this distance can be more than 20 mm, for example 30 mm, 40 mm, 50 mm, 60 mm, 70 mm, 80 mm, 90 mm or even more than 100mm.
  • this makes additional installations, such as a hood to shield the applicator, easier.
  • the invention can be advantageously used for a large number of coating media.
  • coating medium, medium and starch are used synonymously in the following, unless explicitly stated otherwise.
  • the rheology of the coating medium can be influenced very easily and in a targeted manner by subjecting the coating medium, for example a starch solution, to steam and/or air.
  • the viscosity of the coating medium can be reduced by applying hot steam. This less viscous medium can then be pressed deeper into the web in the treatment gap.
  • the viscosity of the medium can also be increased by cooling the medium, for example with air, as a result of which the coating medium remains closer to the surface.
  • the temperature of this thin film can be changed very quickly and easily by applying steam or air. In this way, it is possible to react very quickly and directly, e.g. to properties of the running web that fluctuate over time, and the penetration behavior can be adjusted. With the present invention, it is possible to react immediately to the web fluctuations, ie without a time delay. Such a device can thus be used within the framework of a strength control.
  • the coating medium can be applied differently at the edges than in the middle. It is also possible to apply steam/air to only part of the width of the web - for example only the edges.
  • the solids content of the starch solution can also be controlled by applying steam.
  • the application of steam leads to a supply of water to the coating medium through condensation.
  • the solids content of the medium can be adjusted very easily and efficiently.
  • embodiments of the present invention allow the targeted spatial and temporal adjustment of the solids content of the coating medium directly before it is transferred to the web and offer possibilities for use within the framework of a regulation or control.
  • the applicator can consist of a simple tube with nozzle openings. Since steam and compressed air are already available to supply a paper machine, a simple embodiment of the invention can be implemented with extremely little effort. Alternatively or additionally, however, more complex applicators can also be used, such as a steam blower box, which is described as an example in DE 102015217375.
  • the coating medium can also only be charged with air.
  • the counter element can be realized in different ways. For example, it can be a static element or a band - e.g. a polymer tape or a metal tape can be formed.
  • the counter element can be formed by a second roller.
  • the treatment nip is then formed by a roller nip.
  • the coating system has a second application head for applying a coating medium to the second roller.
  • the coating medium can be transferred to both sides of the web at the same time.
  • the embodiments and advantages described for the (first) applicator also apply—mutatis mutandis—to the second applicator.
  • all application heads known to those skilled in the art can be used.
  • the application head and/or the second application head can be a non-contact application head, in particular a curtain or spray application head. It can be advantageous here that these application heads do not apply the medium in excess, and therefore no squeegee has to be used to control the application quantity. In combination with very hard roller surfaces, for example, these doctor blades can exhibit heavy wear.
  • a hood can also be provided, which shields the applicator alone or together with the applicator head from the environment.
  • a second hood can also be provided, which shields the second applicator alone or together with the second application head from the environment.
  • hoods prevent, among other things, the escape of hot steam into the environment and can be necessary for safety reasons.
  • hoods of this type can prevent the web run from being disturbed in front of the treatment gap by escaping steam or air.
  • two hard rollers can be provided. It can be advantageous if the surface of the roller and/or the second roller has a hardness of less than 15 P&J, in particular less than 5 P&J, or less than 1 P&J. Since the information in P&J is inaccurate in the case of very hard surfaces, it should be mentioned here that the surface of the roller and/or the second roller must also have a hardness of 45 Shore D and more, in particular more than 70 Shore D, preferably between 80 Shore D and 96 Shore D.
  • a hard treatment gap is generally advantageous for the penetration of coating medium.
  • such a hard nip can be particularly effective, for example through the combination with a reduction in the viscosity of the medium.
  • roller or the second roller is designed as a deflection compensation roller. This allows the pressure profile in the
  • Treatment gap can be changed across the width, which, in particular in combination with an adjustment of the properties of the treatment medium (e.g. viscosity or solids content) by the application of steam or air, enables a very efficient control of the penetration behavior of the coating medium.
  • One of the rollers in particular a deflection compensation roller, can be designed as a ceramic roller.
  • one of the two rollers can be designed as a composite roller. If you look at the diameter of the rolls, it can be advantageous - especially with hard rolls - to avoid vibrations if they are rather large
  • the diameters of the rollers are rather small. It can represent a good compromise if the roller and the second roller have a diameter of between 920 mm and 1280 mm, in particular between 1040 mm and 1120 mm. In addition, if the diameter of the roller and the second roller differ by more than 3% but less than 20%, the tendency to vibrate can often be further reduced.
  • the object is achieved by a method for coating a running web, in particular a paper or cardboard web, with a coating medium, the coating medium being applied to the surface of a roller by means of an application head, and then in a treatment gap from the roller to the web is transferred. It is provided that the coating medium is subjected to steam and/or air between application to the roller and transfer to the web.
  • the coating medium can be a starch solution.
  • the steam and/or the air can have a higher temperature than the coating medium when it is applied.
  • the exposure to air/steam then increases the temperature of the coating medium, which reduces its viscosity. This is also very easy to do, especially when using steam.
  • the temperature of the steam is usually much higher than the temperature of the coating medium.
  • the temperature difference between the coating medium can, for example, be more than 20°C, specifically more than 30°C or more than 40°C.
  • a high steam temperature has the advantage that less steam is used to increase the temperature of the coating medium, and therefore less additional moisture is introduced into the coating medium.
  • the temperature of the coating medium increases by at least 3°, in particular by 5° to 20°, as a result of the application of steam and/or air.
  • a coating medium in particular the same coating medium, can be applied to one side of the web or to both sides of the web simultaneously.
  • the coating medium on the second side can either be applied conventionally or, in an analogous manner, steam and/or air can be applied between application to the roller and transfer to the web.
  • FIG. 1 shows a coating system according to one aspect of the present invention.
  • FIG. 2 shows a coating system according to a further aspect of the present invention.
  • the coating system shown in FIG. 1 has a roller 1 and a second roller 2 as a counter-element 2, which are arranged in such a way that together they form a treatment gap 7. Furthermore, an application head 3 for applying a coating medium to the roller 1 is provided.
  • the applicator head 3 can advantageously be a non-contact applicator head 3, in particular a curtain applicator head 3 or a spray applicator head. In principle, however, any application head 3 can be used.
  • the coating medium can be a starch solution.
  • an applicator 5 is arranged between the application head 3 and the treatment gap 7 . This applicator 5 is designed to apply steam and/or air to the coating medium on the roller 1 .
  • the applicator 5 can consist of a simple tube with nozzle openings. Since steam and compressed air are already available to supply a paper machine, a simple embodiment of the invention can be implemented with extremely little effort.
  • the applicator 5 can also be designed to be more complex, for example in the form of a steam blower box 5. Such a one Applicator 5 then also allows, for example, a different application of steam across the width of web 10.
  • a possible embodiment of the coating device for applying coating medium to both sides is shown in FIG.
  • a second applicator head 4 is provided, which applies a coating medium to the surface of the second roller 2 .
  • This coating medium - which may or may not be the same coating medium as for the first side - is then also transferred to the web in the treatment nip 7 .
  • a second applicator is also provided here in order to apply steam and/or air to the coating medium on the second roller 2 .
  • the design of the second applicator head 5 and the second applicator 6 what was said above for the applicator head 3 and the applicator 5 also applies.
  • the second applicator head 4 and the second applicator 6 and/or the applicator 5 and the second applicator 6 can be of identical design. This is advantageous, for example, when applying the same coating medium to both sides of the web 10 with the same objective, e.g., deep penetration into the web 10 to increase strength. Alternatively, however, different media can be applied to both sides and/or different goals can be pursued.
  • the applicator 5 it is also possible for the applicator 5 to apply hot steam to the coating medium in order to cause the starch to penetrate deeply into the web, for example, by reducing the viscosity, while the second applicator 6 applies cold air to the medium on the second roller 2, to keep the medium just more on the surface.
  • the second applicator 6 applies cold air to the medium on the second roller 2, to keep the medium just more on the surface.
  • one Treatment step both increase the strength of the web 10 and finish one of the tops.
  • a fluff 8 is provided, which shields the applicator 5 together with the applicator head 3 from the environment.
  • a similar fluff 9 is provided for the second applicator 6 and the second applicator head 4 .
  • flaps 8, 9 are not absolutely necessary, they can be advantageous for a stable coating or necessary for safety reasons. It is also possible to configure the fluffs 8, 9 in such a way that only the applicator 5 or the second applicator 6 is surrounded by the fluff, but not the applicator head 3 or the second applicator head 4.
  • rollers 1, 2 The person skilled in the art has a great deal of freedom in designing the rollers 1, 2. In principle, all roller types customary for coating systems can be used.
  • rollers with hard surfaces so that, for example, both the roller 1 and the second roller 2 have surface hardnesses of 45 Shore D and more, in particular more than 70 Shore D, preferably between 80 Shore D and 96 Shore D.
  • Rollers 1, 2 for conventional coating systems with diameters of up to 200 cm and more can also be used for coating devices as in FIG.
  • the diameter of the roller 1 and the second roller 2 advantageously differ by more than 3% but less than 20%.
  • the treatment gap 7 is very short and the coating medium is transferred to the web 10 with a short but strong pressure pulse. As a result, the penetration of the coating medium into the depth of the web 10 can be supported in particular.
  • FIG. 2 shows an example of a coating device for coating on one side. It differs from the embodiment shown in Figure 1 in that that the second roller 2 now acts only as a counter-roller 2.
  • the application head 3 for applying the coating medium is designed as a spray application head 3 .
  • FIG. 2 also shows that a hood 8, 9 can optionally be dispensed with. This demonstrates the great flexibility and variety that can be realized with implementations in accordance with aspects of this invention.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Paper (AREA)

Abstract

La présente invention concerne un système de revêtement et un procédé de revêtement d'un voile en défilement, en particulier un voile de papier ou de carton, avec un milieu de revêtement, comprenant un rouleau et une tête d'application pour appliquer le milieu de revêtement sur le rouleau, et un pincement de traitement pour transférer le milieu de revêtement depuis le rouleau sur le voile, le pincement de traitement étant formé par le rouleau et un contre-élément, et, lors de son observation dans le sens de rotation du rouleau, un applicateur étant disposé entre la tête d'application et le pincement de traitement afin de soumettre le milieu de revêtement sur le rouleau à de la vapeur et/ou de l'air.
PCT/EP2021/063470 2020-07-08 2021-05-20 Système de revêtement et procédé de revêtement WO2022008129A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP21728850.5A EP4178781A1 (fr) 2020-07-08 2021-05-20 Système de revêtement et procédé de revêtement

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020117953.7A DE102020117953A1 (de) 2020-07-08 2020-07-08 Beschichtungsanlange und Verfahren zur Beschichtung
DE102020117953.7 2020-07-08

Publications (1)

Publication Number Publication Date
WO2022008129A1 true WO2022008129A1 (fr) 2022-01-13

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2021/063470 WO2022008129A1 (fr) 2020-07-08 2021-05-20 Système de revêtement et procédé de revêtement

Country Status (3)

Country Link
EP (1) EP4178781A1 (fr)
DE (1) DE102020117953A1 (fr)
WO (1) WO2022008129A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4283039A1 (fr) * 2022-05-24 2023-11-29 Andritz Küsters GmbH Dispositif de lissage et d'application d'un milieu d'application

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2308024A (en) * 1940-09-12 1943-01-12 Eastman Kodak Co Method of coating cellulose derivative sheeting
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US5009831A (en) * 1989-06-09 1991-04-23 Union Camp Corporation Extrusion coated substrates with separable and removable layers
EP2735648A1 (fr) * 2012-11-22 2014-05-28 Valmet Technologies, Inc. Dispositif pour traiter un voile de fibres
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