EP2981647B1 - Presse de pelliculage - Google Patents

Presse de pelliculage Download PDF

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Publication number
EP2981647B1
EP2981647B1 EP14713094.2A EP14713094A EP2981647B1 EP 2981647 B1 EP2981647 B1 EP 2981647B1 EP 14713094 A EP14713094 A EP 14713094A EP 2981647 B1 EP2981647 B1 EP 2981647B1
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EP
European Patent Office
Prior art keywords
nip
application
film
fibrous web
coating medium
Prior art date
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Application number
EP14713094.2A
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German (de)
English (en)
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EP2981647A1 (fr
Inventor
Matthias Schmitt
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Voith Patent GmbH
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Voith Patent GmbH
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Publication date
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Publication of EP2981647A1 publication Critical patent/EP2981647A1/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
    • D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
    • D21H23/56—Rolls
    • 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
    • B05D1/28—Processes for applying liquids or other fluent materials performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, 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
    • 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
    • B05D3/002—Pretreatement
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • 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
    • D21H23/58—Details thereof, e.g. surface characteristics, peripheral speed
    • 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
    • D21H23/78—Controlling or regulating not limited to any particular process or apparatus

Definitions

  • the invention relates to a film applicator for one or two-sided application of a liquid or pasty coating medium on a fibrous web, in particular paper or board web according to the preamble of patent claim 1 and a method according to the preamble of claim 13.
  • the solution according to the invention is characterized by its simplicity, as for example.
  • a film applicator for only one-sided application of coating medium on a fibrous web only through the embedded in the elastic reference of the applicator roll sensors reliable statements about the Pressure distribution can be made in both relevant for the reliable coating nips.
  • coating is understood to mean not only the application of coating color to the fibrous web, but also any application of a pigment-containing mixture and / or a mixture for sizing, such as starch-containing mixture, to the fibrous web.
  • an evaluation unit communicating with the pressure sensors and a display unit communicating with the evaluation unit are provided, wherein the signals coming from the pressure sensors are transmitted to the evaluation unit and further processed in the evaluation unit such that they are used as the pressure profile of the first and the first second nips can be visually displayed by means of the display unit.
  • the pressure profiles of the first and the second nips it is conceivable, in particular, for the pressure profiles of the first and the second nips to be displayed on one side of the display device, for example in the same graph.
  • pressure profile (s) Due to the visual representation of the pressure signals as pressure profile (s) it is possible for a machine operator to monitor at a glance both the film formation on the applicator roll and the transfer of the film from the applicator roll to the fibrous web and to intervene in case of deviations from the desired value.
  • the evaluation unit communicates with an acoustic signal generator which, when the pressure values in the first and / or second nip deviate, emits an acoustic signal characteristic of the respective nip in order to inform the machine operator about possible problems in the application process.
  • an acoustic signal generator which, when the pressure values in the first and / or second nip deviate, emits an acoustic signal characteristic of the respective nip in order to inform the machine operator about possible problems in the application process.
  • the acoustic signals of the different nips may have different pitches. So then the machine operator can decide which signal an immediate intervention is required and not, depending on which nip for the result in the concrete production process is particularly critical.
  • both rolls of the roll pair are applicator rolls, so that the fibrous web is simultaneously coated on both sides with the coating medium by the thus executed film applicator.
  • each of the two applicator rollers for the respective provision of a film of the coating medium is assigned in each case an application device and a doctor blade element forming a second nip with the respective applicator roll such that the coating medium present in the form of a film on the one applicator roll of the one applicator roll in the second nip one side of the fibrous web is transferred while the coating medium present on the other applicator roll in the form of a film is transferred from the other applicator roll in the second nip to the other side of the fibrous web.
  • pressure sensors communicating with the evaluation unit are preferably embedded in the elastic relationship between the two applicator rollers, which are arranged side by side in the cross-machine direction, by means of which the pressure profile of at least one second nip, in particular of the second nip, and of the first nip, which adjusts itself in the cross-machine direction, is determined.
  • composition of the coating medium applied to one side of the fibrous web is not necessarily the same must be as the composition of the applied to the other side of the fibrous web coating medium.
  • a further preferred embodiment of the invention provides that at least one of the applicator rollers, in particular both applicator rollers, has or have a signal transmitter communicating with the evaluation unit, which outputs signals characteristic of the rotational position of the applicator roller to the evaluation unit. From this, the evaluation unit can ascertain, in particular, an association of the signals of the pressure sensors during the passage of the pressure sensor (s) through the first and the second nips.
  • the film applicator is operated such that a smaller line force is measured by the pressure sensors in the second nip than in the first nip.
  • the line force measured in the second nip is at least a factor of 10, in particular at least a factor of 15 smaller than the line force measured in the first nip.
  • the pressure sensors used are in this case designed in particular such that a line force in the range of 0.01 kN / m to 10 kN / m and in the first nip a line force in the range of 50 kN / m to 200 kN / m can be determined by these in the second nip.
  • the line force measured by means of the pressure sensors in the second nip can be between 0.5 kN / m and 5 kN / m. If the doctor element is designed, for example, as a doctor bar, then the line force measured by means of the pressure sensors in the second nip can be between 0.01 kN / m and 1 kN / m.
  • the pressure sensors are fiber optic sensors, in particular Bragg grating sensors.
  • Fiber-optic pressure sensors are particularly -bspw. compared to Piezosensoren- by their small dimensions and their very high signal sensitivity. With fiber optic sensors, therefore, extremely small line forces can be measured. Fiber-optic sensors are also characterized by an extremely wide range in signal sensitivity, so that with these both very small and very high line forces can be measured.
  • the one and / or other applicator roll has a roll core, the lateral surface of which is surrounded by the reference, wherein the reference a can be brought into contact with the coating medium functional layer and viewed in the radial direction of the reference between the functional layer and the roll core arranged connecting layer, wherein the pressure sensors are arranged in the connecting layer or in the boundary region between the functional layer and the connecting layer.
  • the bonding layer is harder than the functional layer, in particular by a factor of 10 to 100 harder than the functional layer.
  • all pressure sensors of at least one application roller are arranged along a straight line, wherein the straight line extends in particular parallel to the axis of rotation of the roller.
  • the pressure sensors are each arranged along a straight line, in particular along a straight line parallel to the axis of rotation of the respective roller.
  • the doctor element is, for example, designed as a doctor bar or as a doctor blade, so that the doctor bar or the doctor blade together with the lateral surface of the applicator roll forms the second nip.
  • a method for applying a liquid or pasty coating medium on at least one side of a moving fibrous web, in particular paper or board web, in which the coating medium on an applicator roll in front of a second nip formed by the applicator roll and a doctor element applied in excess and partially removed again to form a film of the coating medium on the applicator roll by the doctor element in the second nip and in which the film is subsequently transferred in a first nip from the applicator roll to a side of the fibrous web which comes into contact with it.
  • the method according to the invention is characterized in that the pressure profile which is established in the cross-machine direction in the first nip and in the second nip is determined by means of pressure sensors embedded in relation to the applicator roll.
  • the pressure profile in the first and second nip is preferably determined by means of pressure sensors embedded in relation to the applicator roll and arranged side by side in the cross-machine direction, which communicate with an evaluation unit.
  • the fibrous web is simultaneously coated on both sides with the coating medium by means of two provided by a pair of rollers and between the first nip forming rollers, wherein the coating medium on the respective applicator roll in front of a respective applicator roll and one of these associated doctor element second Nip applied in excess and for the formation of a film of the coating medium on the respective applicator roll by the respectively associated doctor element in the respective second nip again partially removed and the film subsequently in the first nip of the respective applicator roll on the respective coming into contact with one side of the Fibrous web is transmitted, wherein in the respective first nip and in the second nip in the cross-machine direction adjusting pressure profile embedded in the reference of the respective applicator roll pressure sensor oren is determined.
  • the pressure profile is determined before and / or during the application of the coating medium to the fibrous web.
  • the amount of coating without the production of rejects can be set exactly in advance become.
  • the rejection rate is significantly reduced, especially in the case of film applicators working online, ie integrated into the production line of the paper or board machine, since the paper or board machine can go into production directly after start-up without any paper or board web, for example must be driven to the exact setting of the order amount in the pulper.
  • the fibrous web is a printable fibrous web and the at least one application is applied to one in which a pigment-containing coating medium is applied to the fibrous web.
  • FIG. 1 shows an inventive film applicator 1 for applying a pasty or fluid coating medium 8 on a moving fibrous web 2, in particular paper or board web in cross section.
  • film applicator 1 has a first nip 3 through which the fibrous web 2 is guided and is simultaneously coated on both sides with the coating medium during the implementation.
  • the first nip 3 is formed by two juxtaposed rollers 4, 5.
  • both rollers 4, 5 of the roller pair are application rollers, so that the fibrous web 2 is simultaneously coated on both sides 6, 7 with a coating medium 8 by the thus executed film applicator.
  • a double-sided coated fibrous web 2 leaves the first nip 3.
  • an application roller 10, 10 'associated with an applicator roller 4, 5 and the doctor element 12, 12' are arranged on a common support beam 13, 13 '. Furthermore, in the present case, each of the doctor elements 12, 12 'is designed as a doctor bar.
  • a plurality of pressure sensors 14, 14 'arranged side by side in the cross-machine direction are embedded in the elastic covering of each applicator roll 4, 5 (of which in FIG FIG. 1 only one pressure sensor 14, 14 'can be seen), by means of which the pressure profile in the cross machine direction in the first nip 3 and in the two second nips 11, 11' can be determined.
  • the pressure sensors 14, 14 ' are designed as fiber-optic sensors, in particular Bragg grating sensors.
  • the pressure sensors 14, 14 'as piezoelectric sensors in each application roller 4, 5 all pressure sensors 14, 14 'are arranged along a straight line running parallel to the axis of rotation of the rollers.
  • FIG. 1 1 is the line force measured by the pressure sensors 14, 14 'in the second nips 11, 11' as the line force measured in the first nip 3, wherein a line force in the region by the pressure sensors 14, 14 'in the second nip 111, 11' from 5kN / m to 50kN / m and in the first nip a line force in the range of 60kN / m to 200kN / m is determined.
  • Each of the applicator rollers 4, 5 has a roller core 20, 20 ', the lateral surface of which is surrounded by the cover, the cover being a functional layer 21, 21' which can be brought into contact with the coating medium 8 and a functional layer 21 viewed in the radial direction of the cover , 21 'and the roller core 20, 20' arranged connecting layer 22, 22 ', wherein the pressure sensors 14, 14' present in the interface between the functional layer 21, 21 'and the connecting layer 22, 22' are arranged.
  • the functional layer 21, 21 ' is made of polyurethane with a hardness in the region of 80 Shore A
  • the connecting layer 22, 22' is a fiber composite layer of epoxy resin and glass fibers with a hardness of 90 Shore D.
  • the connecting layer 22, 22 ' harder than the functional layer 21, 21 '.
  • each of the pressure sensors When the pressure sensors 14, 14 'pass through the respective nip 3, 11, 11', each of the pressure sensors generates one or more signals corresponding to the pressure action in the nip, which signal is transmitted to an evaluation unit 15.
  • an evaluation unit 15 present is the evaluation unit 15 completely outside the applicator rollers 4, 5 arranged. But there are also designs in which parts of the evaluation are rotatably connected to the respective roller and other parts are arranged outside the roller, that are not rotatably connected to the respective roller. In the present case, the signals of the pressure sensors 14, 14 'are transmitted wirelessly to the evaluation unit.
  • a signal transmitter 19, 19 'communicating with the evaluation unit 15 is provided in each of the applicator rollers 4, 5, which outputs characteristic signals to the evaluation unit 15 for the rotational position of the respective applicator roller 4, from which the evaluation unit 15 determines an assignment of the signals of the pressure sensors 14, 14 'to the passage of the respective pressure sensors 14, 14' through the first nip 3 and the respective second nip 11, 11 '.
  • the signal transmitters 19, 19 ' are designed according to the Hall sensor principle.
  • the FIG. 2 shows for several revolutions of one of the applicator rollers 4, 5, the signals that are measured by the pressure sensors 14, 14 'when passing through the first nip 3 and by one of the second nips 11, 11'.
  • the signals A are generated by the pressure sensors 14, 14 'as they pass through the second nip 11, whereas the signals B are generated by the pressure sensors 14, 14' as they pass through the first nip 11.
  • the line force at the pressure sensor 14, 14 ' is proportional to that in the FIG. 2 shown peak-to-peak values of the signals A, B of the pressure sensors 14, 14 '.
  • the order of the coating medium 8 takes place by means of both film applicators 1 on-line in the machine. Further, in the illustrated machine, the production of the fibrous web is performed at a machine speed of 1200 meters / minute or more, particularly at a machine speed of 1500 meters / minute or more.

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

Claims (19)

  1. Mécanisme d'application de film destiné à appliquer un fluide de revêtement pâteux ou liquide sur une nappe de matière fibreuse en déplacement, en particulier une nappe de papier ou de carton, le mécanisme présentant une paire de cylindres formant un premier interstice dans lequel passe la nappe de matière fibreuse, au moins l'un des cylindres de la paire de cylindres étant un cylindre d'application par lequel le fluide de revêtement délivré sous la forme d'un film sur le cylindre d'application peut être transféré dans le premier interstice du cylindre d'application sur une face de la nappe de matière fibreuse en contact avec ce dernier, un dispositif d'application et un élément de raclage étant associés au cylindre d'application de telle sorte qu'en amont du premier interstice, le fluide de revêtement soit d'abord appliqué en excès sur le cylindre d'application au moyen du dispositif d'application et soit ensuite appliqué de nouveau en partie dans le deuxième interstice en vue de former le film au moyen de l'élément de raclage qui forme un deuxième interstice avec le cylindre d'application,
    caractérisé en ce que
    plusieurs capteurs de pression disposés les uns à côté des autres dans la direction transversale à la direction machine et au moyen desquels le profil de pression dans la direction transversale à la direction machine dans le premier et dans le deuxième interstice peut être déterminé sont incorporés dans le revêtement élastique du cylindre d'application.
  2. Mécanisme d'application de film selon la revendication 1, caractérisé en ce qu'une unité d'évaluation qui communique avec le capteur de pression ainsi qu'une unité d'affichage qui communique avec l'unité d'évaluation sont prévues, les signaux provenant des capteurs de pression étant transmis à l'unité d'évaluation et étant transformés dans l'unité d'évaluation de manière à pouvoir être présentés visuellement par l'unité d'affichage sous la forme d'un profil de pression dans le premier et le deuxième interstice.
  3. Mécanisme d'application de film selon l'une des revendications précédentes, caractérisé en ce que les deux cylindres de la paire de cylindres sont des cylindres d'application, un dispositif d'application étant associé à chacun des deux cylindres d'application pour délivrer un film de fluide de revêtement sur le cylindre d'application concerné et un élément de raclage formant un deuxième interstice étant associé à chaque cylindre d'application de telle sorte que le fluide de revêtement présent sous la forme d'un film sur l'un des cylindres d'application puisse être transféré par ce cylindre d'application sur une face de la nappe de matière fibreuse dans le premier interstice et en ce que le fluide de revêtement présent sous la forme d'un film sur l'autre cylindre d'application puisse être transféré par cet autre cylindre d'application sur l'autre face de la nappe de matière fibreuse dans le premier interstice.
  4. Mécanisme d'application de film selon l'une des revendications précédentes, caractérisé en ce que des capteurs de pression qui communiquent avec l'unité d'évaluation sont incorporés dans le revêtement élastique des deux cylindres d'application et sont disposés l'un à côté de l'autre dans la direction transversale à la direction machine et en ce qu'au moyen des capteurs de pression et de l'unité d'évaluation, le profil de pression dans la direction transversale à la direction machine peut être déterminé dans au moins l'un des premiers interstices et en particulier dans les deux deuxièmes interstices ainsi que dans le premier interstice.
  5. Mécanisme d'application de film selon l'une des revendications précédentes, caractérisé en ce qu'au moins l'un des cylindres d'application possède un émetteur de signaux qui communique avec l'unité d'évaluation et fournit à l'unité d'évaluation des signaux caractéristiques de la position en rotation du cylindre d'application, grâce à quoi l'unité d'évaluation détermine une association entre les signaux des capteurs de pression et le passage du ou des capteurs de pression dans le premier et le deuxième interstice.
  6. Mécanisme d'application de film selon l'une des revendications précédentes, caractérisé en ce que les capteurs de pression sont des capteurs à fibre optique, et en particulier des capteurs à grille de Bragg.
  7. Mécanisme d'application de film selon l'une des revendications précédentes, caractérisé en ce que la force linéaire mesurée par les capteurs de pression dans le deuxième interstice est inférieure à celle mesurée dans le premier interstice.
  8. Mécanisme d'application de film selon l'une des revendications précédentes, caractérisé en ce que dans le deuxième interstice, les capteurs de pression peuvent déterminer une force linéaire comprise dans la plage de 5 kN/m à 50 kN/m et dans le premier interstice une force linéaire comprise dans la plage de 60 kN/m à 200 kN/m.
  9. Mécanisme d'application de film selon l'une des revendications précédentes, caractérisé en ce que le premier cylindre d'application et/ou l'autre cylindre d'application possèdent une âme de cylindre dont la surface d'enveloppe est entourée par le revêtement, le revêtement comprenant une couche fonctionnelle qui peut être amenée en contact avec le fluide de revêtement et une couche de liaison disposée dans la direction radiale du revêtement entre la couche fonctionnelle et l'âme du cylindre, les capteurs de pression étant disposés dans la zone frontière entre la couche fonctionnelle et la couche de liaison.
  10. Mécanisme d'application de film selon l'une des revendications précédentes, caractérisé en ce que la couche de liaison est plus dure que la couche fonctionnelle, et en particulier plus dure que la couche fonctionnelle d'un facteur de 10 à 100.
  11. Mécanisme d'application de film selon l'une des revendications précédentes, caractérisé en ce que l'élément de raclage est configuré comme barreau de raclage ou lame de raclage.
  12. Mécanisme d'application de film selon l'une des revendications précédentes, caractérisé en ce que tous les capteurs de pression sont disposés sur une ligne droite qui s'étend parallèlement à l'axe de rotation des cylindres.
  13. Mécanisme d'application de film selon l'une des revendications précédentes, caractérisé en ce que le fluide de revêtement est un mélange contenant des pigments ou de l'amidon.
  14. Procédé d'application d'un fluide de revêtement liquide ou pâteux sur au moins une face d'une nappe de matière fibreuse en déplacement, en particulier une nappe de papier ou de carton, dans lequel le fluide de revêtement est appliqué en excès sur un cylindre d'application en avant d'un deuxième interstice formé par le cylindre d'application et un élément de raclage et est de nouveau appliqué partiellement sur le cylindre d'application par l'élément de raclage dans un deuxième interstice, en vue de former un film de fluide de revêtement, le film étant ensuite transféré dans un premier interstice par les cylindres d'application sur une face de la nappe de matière fibreuse en contact avec ce dernier,
    caractérisé en ce que
    plusieurs capteurs de pression disposés les uns à côté des autres dans la direction transversale à la direction machine sont incorporés dans le revêtement élastique du cylindre d'application et le profil de pression dans la direction transversale à la direction machine dans le premier interstice et le deuxième interstice est déterminé au moyen de capteurs de pression incorporés dans le revêtement du cylindre d'application.
  15. Procédé selon la revendication 14, caractérisé en ce que le profil de pression est déterminé avant et/ou pendant l'application du fluide de revêtement sur la nappe de matière fibreuse.
  16. Procédé selon l'une des revendications 14 et 15, caractérisé en ce que le profil de pression dans le premier et le deuxième interstice est déterminé au moyen de capteurs de pression incorporés dans le revêtement du cylindre d'application et disposés les uns à côté des autres dans la direction transversale à la direction machine, qui communique avec une unité d'évaluation.
  17. Procédé selon l'une des revendications 14 à 16, caractérisé en ce que la nappe de matière fibreuse est revêtue simultanément sur ses deux faces de fluide de revêtement au moyen de deux cylindres d'application prévus en paires de cylindres et entre lesquels se forme le premier interstice, le fluide de revêtement étant appliqué en excès sur le cylindre d'application concerné en amont d'un deuxième interstice formé par le cylindre d'application concerné et un élément de raclage qui lui est associé, et pour la formation d'un film de fluide de revêtement sur le cylindre d'application concerné par l'élément de raclage associé, est appliqué de nouveau en partie dans le deuxième interstice, le film étant ensuite transféré, dans le premier interstice, par le cylindre d'application concerné sur la face de la nappe de matière fibreuse en contact avec ce dernier, le profil de pression qui s'établit dans la direction transversale à la direction machine dans le premier interstice et dans le deuxième interstice étant déterminé au moyen de capteurs de pression incorporés dans le revêtement du cylindre d'application concerné.
  18. Procédé de fabrication d'une nappe de matière fibreuse revêtue, en particulier d'une nappe de papier, de carton ou de papier mouchoir, le procédé présentant les étapes suivantes :
    formation de la nappe de matière fibreuse à partir d'un mélange de matière fibreuse avec débordement de matière et partie de façonnage,
    essorage de la nappe de matière fibreuse dans une partie de presse,
    pré-séchage de la nappe de matière fibreuse jusqu'à une teneur définie en matière sèche,
    plusieurs applications d'un fluide de revêtement au moyen du procédé selon l'une des revendications 14 à 18 qui précèdent,
    séchage final de la nappe de matière fibreuse revêtue, au moins une application de fluide de revêtement ayant lieu en ligne dans la machine et la fabrication de la nappe de matière fibreuse s'effectuant à une vitesse machine de 1 200 mètres/minute ou davantage, en particulier à une vitesse machine de 1 500 mètres/minute ou davantage.
  19. Procédé selon la revendication 18, caractérisé en ce que la nappe de matière fibreuse est une nappe de matière fibreuse imprimable et en ce que lors de la ou des applications, un fluide de revêtement pigmenté est appliqué sur la nappe de matière fibreuse.
EP14713094.2A 2013-04-05 2014-03-26 Presse de pelliculage Active EP2981647B1 (fr)

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CN105121743A (zh) 2015-12-02
EP2981647A1 (fr) 2016-02-10
US20160038969A1 (en) 2016-02-11
WO2014161755A1 (fr) 2014-10-09
CN105121743B (zh) 2017-09-26

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