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EP4316671B1 - Mécanisme d'application à nappe permettant d'appliquer des agents d'application sur au moins un cylindre applicateur - Google Patents

Mécanisme d'application à nappe permettant d'appliquer des agents d'application sur au moins un cylindre applicateur

Info

Publication number
EP4316671B1
EP4316671B1 EP22188078.4A EP22188078A EP4316671B1 EP 4316671 B1 EP4316671 B1 EP 4316671B1 EP 22188078 A EP22188078 A EP 22188078A EP 4316671 B1 EP4316671 B1 EP 4316671B1
Authority
EP
European Patent Office
Prior art keywords
curtain
starch
operation mode
applicator
sump
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
EP22188078.4A
Other languages
German (de)
English (en)
Other versions
EP4316671A1 (fr
Inventor
Dr. Eduard DAVYDENKO
Andreas Pesch
Gerald Steiner
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.)
Andritz Kuesters GmbH
Original Assignee
Andritz Kuesters 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 Andritz Kuesters GmbH filed Critical Andritz Kuesters GmbH
Priority to EP22188078.4A priority Critical patent/EP4316671B1/fr
Priority to BR102023012332-5A priority patent/BR102023012332A2/pt
Priority to US18/362,492 priority patent/US20240033768A1/en
Priority to CN202310955852.5A priority patent/CN117488582B/zh
Publication of EP4316671A1 publication Critical patent/EP4316671A1/fr
Application granted granted Critical
Publication of EP4316671B1 publication Critical patent/EP4316671B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • 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
    • 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
    • B05C1/0813—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 characterised by means for supplying liquid or other fluent material to the roller
    • 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
    • B05C1/086—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 a pool of coating material being formed between a roller, e.g. a dosing roller and an element cooperating therewith
    • 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
    • B05C3/00—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material
    • B05C3/02—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material
    • B05C3/12—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material for treating work of indefinite length
    • B05C3/125—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material for treating work of indefinite length the work being a web, band, strip or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/005—Curtain coaters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • 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
    • 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
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/16—Sizing or water-repelling agents
    • 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
    • D21H23/32—Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper
    • 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
    • D21H23/32—Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper
    • D21H23/42—Paper being at least partly surrounded by the material on both sides
    • 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
    • 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 device for applying coating media, in particular starch or glue suspension, to a moving paper or cardboard web according to the preamble of claim 1.
  • testliner TL
  • corrugated board CM
  • the production of packaging papers and cardboard increasingly relies on recycled paper fibers.
  • testliner TL
  • corrugated board CM
  • the use of starch in papermaking can compensate for this loss of strength.
  • the starch is usually added either directly to the fiber suspension or sprayed onto the wet web in the forming section.
  • the starch can be added immediately after the pre-drying section.
  • the coating can be applied to the paper web using touching or non-touching application methods.
  • the curtain sizer also has technological limitations. It is limited with regard to low starch viscosities. At viscosities below 30 mPa ⁇ s (with solids contents below 10%), a thin liquid film of starch becomes unstable upon contact with the application roller, disrupting the uniform distribution of the starch application. Applying a uniform, thin film, as required in film press operation, is therefore no longer possible. However, low viscosities with low starch contents are necessary to achieve high starch penetration into the paper. As previously described, in these cases it is better to supply the starch via a sump than via a film.
  • Bottom coating is therefore advantageous at low viscosity (below 20-30 mPa ⁇ s) or low solids content (below 10%). to use and to apply the film at higher viscosities (over 30 mPa ⁇ s) and higher solids contents (over 10%).
  • TL paper types testliner
  • CM corrugated board
  • Testliner and corrugated board are papers with a basis weight ranging from 70 to 200 g/ m2 , made from raw materials consisting of 100% recycled paper fibers. Corrugated board is used for the middle layer, forming the flutes in the production of corrugated board, while testliner (TL) is used for the outer layer. Corrugated board (CM) uses higher-quality recycled paper fibers than testliner (TL).
  • test liner Due to the different applications of test liner and corrugated material, different requirements are placed on the properties of these products.
  • surface smoothness and its hydrophobicity, as well as strength properties such as ring crush resistance (RCT), strip crush resistance (SCT), and burst strength are important.
  • SCT strip crush resistance
  • burst strength For corrugated material, surface smoothness and its hydrophobicity are less important, but strength properties such as burst strength, strip crush resistance (SCT), and especially flat crush resistance (CMT) are of great significance.
  • the surface treatment of the two products with starch and glue has different objectives. While maximum penetration of the starch into the paper is required for the corrugated board, a surface treatment with starch and glue is the primary focus for the testliner.
  • the testliner aims to fix the starch to the surface (see K confuseler, B.: Improvement of paper strength and process reliability in the surface treatment of corrugated base papers through specific starch digestion. PTS research report). IW 050275, Heidenau, 2006). Accordingly, the starch solutions for these two applications are prepared differently so that targeted control of the penetration depth into the paper is possible.
  • the swamp press and curtain sizer are two independent units that must be arranged sequentially in the plant, similar to blade coaters on a coating machine. Installing additional coating units typically requires extending the paper machine. This necessitates compromises in machine design and the production process, often at the expense of paper quality.
  • the object of the invention is therefore to create a device for applying coating media, in particular starch or glue, to packaging papers and cardboard, especially corrugated board (CM) and testliner (TL), which improves the achievable paper/cardboard quality, particularly in stable production.
  • coating media in particular starch or glue
  • This provides a device for applying coating media by means of at least one curtain applicator with a curtain applicator nozzle for applying the coating medium to an applicator roller, which combines the two operating modes of a film press and a wet press.
  • the curtain applicator according to the invention can alternatively be operated as a film press or as a wet press and thus forms a combination unit.
  • an applicator is created that differs from the design of known curtain applicators.
  • the gap adjustment from 500 ⁇ m to 2.0 mm results in high curtain weights, the stabilization of which, due to the formation of a liquid sump above a roller nip, no longer directly determines the coating quality.
  • Capillary forces during the residence time in the sump and the hydraulic pressure during passage through the nip allow the applicator to penetrate the web.
  • the liquid level in the sump which is influenced according to the invention via the gap adjustment, is a determining factor for the uptake of applicator and thus for the paper/board quality.
  • a simple conversion of existing sump presses to a device according to the invention, with at least one coating unit according to the invention, is possible with minimal effort. Furthermore, the coating process can be changed from film coating to sump operation without shutting down the paper machine. This eliminates the disadvantage that existing paper and board machines often have limited flexibility for retrofitting with additional units, as this space was not originally provided.
  • the invention relates to a device for applying coating media, in particular starch or glue, to a moving paper and cardboard web 11, in particular testliner or corrugated board.
  • the device comprises at least one curtain applicator 2.1, 2.2 with a curtain applicator nozzle for applying the coating medium in the form of a curtain 4.1, 4.2 onto at least one applicator roller 6, 7.
  • the curtain applicator nozzle of the respective curtain applicator 2.1, 2.2 further comprises a gap adjustment 3.1, 3.2 for adjusting the exit gap 14.1, 14.2 of the curtain applicator nozzle.
  • the gap adjustment 3.1, 3.2 of the discharge gap 14.1, 14.2 allows for adjustment from 100 ⁇ m to 500 ⁇ m for film operation and to 500 ⁇ m for film operation. ⁇ m to 2.0 mm for a sump operation which is designed to be operable in different operating modes at least by one curtain applicator 2.1, 2.2.
  • a curtain coating unit 2.1, 2.2 in conjunction with coating rollers 5, 6 is preferably provided, wherein at least one coating roller 7 can be designed as a bending-controlled roller.
  • These rollers are known, for example, under the names S-roller, MHV roller or NIPCO roller.
  • the rollers 6, 7 for forming the roller nip 15 can be provided with hard coatings, for example ceramic or chrome, or can also be equipped with hard polymer coverings.
  • the surface hardness is less than 30 Pusey & Jones, preferably less than 15 P&J.
  • the application rollers 6, 7 can be temperature-controlled.
  • FIG. 1 shows an embodiment of the device according to the invention in film operation mode.
  • Film operation is an application system that pre-meters a precise film, which is transferred to the web 11 in the roller gap 15 without any scum.
  • the film operation of the curtain application unit 2.1, 2.2 allows for the application of a very high solids content of starch.
  • Reference numeral 12 indicates a possible lateral guide for excess application medium.
  • the direction of travel of a web is from top to bottom and is indicated by an arrow.
  • This is, for example, the coating of a test liner (TL).
  • the solids content of the starch is relatively high at 15%.
  • the volumetric flow rate for the coating is therefore relatively low.
  • a cleaning scraper 9.1, 9.2 is positioned against the coating roller 6, 7 and is in the operating position.
  • the coating roller 6, 7 is continuously cleaned during production by the cleaning scraper 9.1, 9.2.
  • Spray water or steam nozzles 10.1, 10.2 may be provided for cleaning the coating rollers 6, 7. Fibers and starch particles adhering to the roller surface are removed by the Cleaning scraper removed from roller 6, 7.
  • a drip tray 8.1, 8.2 prevents water from dripping onto the moving paper web 11.
  • the curtain applicator nozzle of the curtain applicator 2.1, 2.2 can be moved hydraulically or by motor. A pivoting movement of the entire unit can be provided for this purpose.
  • the nozzle and the entire unit of the curtain applicator 2.1, 2.2 can be moved into a preparation position. In the preparation position, the starch preferably flows into a preparation trough 5.1, 5.2 and is from there returned to the workstation.
  • the curtain application nozzle of the curtain application unit 2.1, 2.2 is positioned such that, for example, the point of impact of the curtain 4.1, 4.2 is located on the axis of the application roller 6, 7.
  • the angle ⁇ is between zero and 45°.
  • This position of the curtain application nozzle is preferably selected such that the distance from the air boundary layer extraction point to the curtain is minimal. This prevents disruptive influences of the boundary layer airflow along the moving roller surface on the curtain. In this position, it is possible to generate a stable curtain without heel formation and without unwanted backflow on the moving roller 6, 7. Below a positioning angle ⁇ of approximately 45°, the thin curtain is disturbed by the boundary layer airflow, and uniform contact with the roller surface is no longer possible.
  • the application rollers 6, 7 are preferably arranged at an angle of 0° to 15° to each other.
  • the application medium can be applied to both sides of the application rollers 6, 7 by means of a curtain 4.1, 4.2.
  • a nozzle with a discharge gap 14.1, 14.2 of 100–500 ⁇ m is used to form a curtain 4.1, 4.2.
  • the application medium can be starch, glue, or a mixture of these media.
  • the application medium is then transferred in nip 15 between the application rollers 6 and 7 onto the paper or cardboard web 11.
  • the respective curtain 4.1, 4.2 can have a curtain height in the range of 50 to 300 mm between the point of impact on the application roller 6, 7 and the nozzle exit.
  • the application medium in particular the starch or the glue solution, can first be applied to the application roller via the nozzle or fed directly into a sump 13.
  • the curtain application nozzle can be positioned, for example, by means of a linear guide 1.1, 1.2.
  • the volumetric flow rates are correspondingly higher.
  • sump operation requires an even higher volumetric flow rate to maintain a specific sump height.
  • the volumetric flow rate in sump operation can be two to three times higher than in the operating mode of a curtain sizer (film operation).
  • the outlet gap 14.1, 14.2 is adapted to the volume flow rate according to the invention.
  • the outlet gap 14.1, 14.2 of the nozzle for sump operation is selected to be larger than in curtain operation for film operation.
  • An outlet gap 14.1, 14.2 of 0.5 to 2.0 The mm dimension has proven optimal for sump operation according to the invention.
  • a gap adjustment 3.1, 3.2 is provided on the nozzle lip.
  • the nozzle of the curtain applicator 2.1, 2.2 is positioned during sump operation such that the angle ⁇ for the point of impact of the curtain 4.1, 4.2 on the application roller 6, 7 or the sump 13 is in the range between 30° and 90°, preferably between 45° and 60°.
  • Cleaning of the application roller 6, 7 is preferably not necessary in sump operation mode, since the roller 6, 7 is cleaned by the flow of starch in the sump 13.
  • the cleaning scraper 9.1, 9.2 is swung away.
  • Corrugated board (CM) and testliner (TL) are usually produced on the same paper machine.
  • the changeover between grades often occurs without stopping the paper machine.
  • the curtain nozzle of the curtain applicator 2.1, 2.2, and the entire unit can move towards nip 15.
  • the production of testliner (TL) to corrugated board (CM) is switched on the paper machine during ongoing production.
  • the process would then be as follows:
  • the starch continues to be applied to the application roller 6, 7 via the curtain nozzle.
  • the sump operation requires an additionally higher volume flow rate to achieve a specific sump height.
  • the outlet gap 4.1, 4.2 of the nozzle is enlarged for sump operation to adapt the exit velocity to the higher volume flow rate.
  • the outlet gap 4.1, 4.2 of the nozzle is therefore adjusted from, for example, 350 ⁇ m to approximately 1 mm to align the application unit with the To switch to the sump operating mode.
  • the adjustment of the outlet gap 4.1, 4.2 can be carried out manually or automatically (motorized or hydraulically).
  • the hard coating roller 6 would have to be equipped so that higher surface temperatures can be set (thermal roller).
  • FIG. 3 and Fig. 4 Figures 3.1 and 3.2 show different embodiments of the gap adjustment at the outlet nozzle.
  • Fig. 3 A gap adjustment 3.1, 3.2 is shown via an adjusting device that engages the nozzle lip.
  • the adjusting device can be, for example, an eccentric shaft, a plunger, or a wedge.
  • the adjusting device can be electrically and/or mechanically actuated.
  • the nozzle gap could also be adjusted, for example, with the aid of linear actuators 3.3.
  • the position of the at least one curtain application nozzle relative to the application roller can be changed in such a way that the curtain height remains essentially the same in the different operating modes.
  • the line force in the roller nip 15 can be between 20 kN/m and 200 kN/m, preferably between 80 kN/m and 120 kN/m.
  • the paper or board web speed can be between 250 m/min and 2000 m/min, preferably between 600 m/min and 1800 m/min.
  • the dry content of the paper or board web 11 can be greater than 90%, particularly between 92% and 98%.
  • Starch as the coating medium can be provided with a specific volume flow rate between 15 l/(min*m) and 150 l/(min*m) for wetbed operation and between 5 l/(min*m) and 50 l/(min*m) for film operation.
  • Starch as the coating medium can be provided with a solids content between 5% and 10% for wetbed operation and between 10% and 25% for film operation.
  • the viscosity of the starch as the coating medium can be selected between 20 mPas and 200 mPas.
  • the temperature of the starch as the coating medium can be selected between 50°C and 110°C, preferably between 70°C and 100°C.

Landscapes

  • Paper (AREA)
  • Coating Apparatus (AREA)

Claims (17)

  1. Dispositif pour appliquer des milieux d'application en particulier de l'amidon ou de la colle, sur une bande de papier et de carton en mouvement (11), en particulier une chemise d'essai ou un milieu d'ondulation, au moyen d'au moins un applicateur en rideau (2.1, 2.2) avec une buse d'application en rideau pour appliquer le milieu d'application sur un rouleau d'application (6, 7), qui forme une ligne de contact de traitement (15) avec un deuxième rouleau (6, 7), dans lequel le milieu d'application est transféré à partir du rouleau d'application (6, 7) sur le côté respectif de la bande de papier et de carton (11), et la buse de l'applicateur en rideau présente un réglage d'espace (3.1, 3.2) pour régler la fente de sortie (14.1, 14.2), dans lequel au moins une buse d'applicateur en rideau peut être alimentée avec des supports d'application préparés différemment, et caractérisé en ce que l'applicateur en rideau (2.1, 2.2) est conçu de telle sorte qu'il combine les deux modes de fonctionnement du film et du carter en fournissant un dispositif de réglage actionnable électriquement et/ou mécaniquement pour le réglage de la fente (3.1, 3.2) de la fente de sortie (14.1, 14.2) de la buse de l'applicateur en rideau, qui vient en prise avec une lèvre de buse et règle alternativement l'espace de sortie (14.1, 14.2) alternativement à 100 à 500 µm pour le fonctionnement du film ou à 500 µm à 2,0 mm pour le fonctionnement du carter, de sorte que le au moins un applicateur en rideau (2.1, 2.2) est conçu pour fonctionner dans ces différents modes de fonctionnement.
  2. Dispositif selon la revendication 1, caractérisé en ce que la position de au moins une buse d'application en rideau par rapport au rouleau d'application (6, 7) est variable.
  3. Dispositif selon la revendication 2, caractérisé en ce que la position de au moins une buse d'application en rideau par rapport au rouleau d'application (6, 7) peut être modifiée de telle sorte que la hauteur du rideau reste sensiblement la même dans les différents modes de fonctionnement.
  4. Dispositif selon l'une des revendications précédentes, caractérisé en ce que au moins un des deux rouleaux (6, 7) formant la ligne de contact de traitement (15) est conçu comme un rouleau de compensation de pliage (7).
  5. Dispositif selon l'une des revendications précédentes, caractérisé en ce que le diamètre dudit au moins un rouleau d'application (6, 7) est compris entre 1 000 et 1 800 mm, de préférence entre 1 200 et 1 600 mm.
  6. Dispositif selon l'une des revendications précédentes, caractérisé en ce que la dureté d'un bouchon de rouleau d'application dur (6, 7) est choisie dans la plage de 0 à 5 P&J, de préférence de 0 à 1 P&J.
  7. Dispositif selon l'une des revendications précédentes, caractérisé en ce que l'un des rouleaux (6, 7) est conçu comme un rouleau de compensation de pliage (7) avec 5 à 30 P&J, de préférence 0 à 10 P&J.
  8. Dispositif selon l'une des revendications précédentes, caractérisé en ce que un entonnoir de débordement (12) est prévu dans une région périphérique de au moins une buse d'application en rideau pour chaque bord, qui est formé sur le côté de la ligne de contact (15).
  9. Dispositif selon l'une des revendications précédentes, caractérisé en ce que la force linéaire dans la ligne de contact de traitement (15) est comprise entre 20 kN/m et 200 kN/m, de préférence entre 80 kN/m et 120 kN/m.
  10. Dispositif selon l'une des revendications précédentes, caractérisé en ce que la vitesse de la bande de papier ou de carton (11) est comprise entre 250 m/min et 2 000 m/min, de préférence entre 600 m/min et 1 800 m/min.
  11. Dispositif selon l'une des revendications précédentes, caractérisé en ce que la teneur en matière sèche de la bande de papier ou de carton (11) est choisie supérieure à 90 %, en particulier comprise entre 92 % et 98 %.
  12. Dispositif selon l'une des revendications précédentes, l'invention est caractérisée en ce que l'amidon est utilisé comme milieu d'application avec un débit volumique spécifique compris entre 15 l/(min*m) et 150 l/(min*m) en fonctionnement de puisard et entre 5 l/(min*m) et 50 l/(min*m) en fonctionnement de film.
  13. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que l'on prévoit comme milieu d'enduction de l'amidon avec une teneur en matières solides comprise entre 5 % et 12 % en fonctionnement de carter et entre 10 % et 25 % en fonctionnement de film.
  14. Dispositif selon l'une des revendications précédentes, caractérisé en ce que la viscosité de l'amidon en tant que milieu d'application est choisie entre 20 mPas et 200 mPas.
  15. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que les températures de l'amidon en tant que milieu d'application sont choisies entre 50°C et 110°C, de préférence entre 70°C et 100°C.
  16. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que l'angle a pour le point d'impact du rideau sur au moins un rouleau d'application (6, 7) est choisi entre 0° et 45°, de préférence entre 0° et 15°, et en fonctionnement de carter entre 30° et 90°, de préférence entre 45° et 60°, par rapport à la verticale.
  17. Dispositif selon la revendication 16, caractérisé en ce que la buse à rideau peut être positionnée par l'intermédiaire d'un dispositif de commande pour modifier le mode de fonctionnement pendant la production.
EP22188078.4A 2022-08-01 2022-08-01 Mécanisme d'application à nappe permettant d'appliquer des agents d'application sur au moins un cylindre applicateur Active EP4316671B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP22188078.4A EP4316671B1 (fr) 2022-08-01 2022-08-01 Mécanisme d'application à nappe permettant d'appliquer des agents d'application sur au moins un cylindre applicateur
BR102023012332-5A BR102023012332A2 (pt) 2022-08-01 2023-06-20 Aplicador de cortina para a aplicação de meios de aplicação em pelo menos um rolo aplicador
US18/362,492 US20240033768A1 (en) 2022-08-01 2023-07-31 Curtain coater for applying a treatment substance on at least on applicator roll
CN202310955852.5A CN117488582B (zh) 2022-08-01 2023-08-01 用于将处理物质施加到至少一个涂布辊上的帘式涂布机构

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EP22188078.4A EP4316671B1 (fr) 2022-08-01 2022-08-01 Mécanisme d'application à nappe permettant d'appliquer des agents d'application sur au moins un cylindre applicateur

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EP4316671B1 true EP4316671B1 (fr) 2025-12-24

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US (1) US20240033768A1 (fr)
EP (1) EP4316671B1 (fr)
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2555047Y2 (ja) * 1991-05-16 1997-11-19 石川島播磨重工業株式会社 ロールコータ
EP1664432B1 (fr) * 2003-09-16 2017-08-02 Voith Patent GmbH Procede et dispositif de fabrication d'un papier decoratif, et utilisation de ce papier
US8960123B2 (en) * 2013-02-08 2015-02-24 Enki Technology, Inc. Coating and curing apparatus and methods
FI128981B (en) 2018-07-27 2021-04-30 Voith Patent Gmbh Method and apparatus for applying starch
FI128753B (en) * 2018-09-05 2020-11-30 Valmet Technologies Oy Fiber web treatment method and treatment system for fiber web treatment
DE202019106814U1 (de) 2019-12-06 2019-12-23 Voith Patent Gmbh Auftragsvorrichtung
EP3842591B1 (fr) * 2019-12-23 2026-02-04 Andritz Küsters GmbH Dispositif d'application d'un milieu d'application

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EP4316671A1 (fr) 2024-02-07
BR102023012332A2 (pt) 2024-03-12
CN117488582A (zh) 2024-02-02
CN117488582B (zh) 2026-01-13

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