EP4680804A1 - Auftragsvorrichtung und verfahren - Google Patents
Auftragsvorrichtung und verfahrenInfo
- Publication number
- EP4680804A1 EP4680804A1 EP24705420.8A EP24705420A EP4680804A1 EP 4680804 A1 EP4680804 A1 EP 4680804A1 EP 24705420 A EP24705420 A EP 24705420A EP 4680804 A1 EP4680804 A1 EP 4680804A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- application
- width
- application nozzle
- nozzle
- designed
- 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.)
- Granted
Links
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
- D21H23/24—Addition to the formed paper during paper manufacture
-
- 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
- D21H19/00—Coated paper; Coating material
- D21H19/10—Coatings without pigments
- D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
-
- 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
- D21H23/50—Spraying or projecting
Definitions
- the invention relates to an application device for coating a fibrous web, in particular a paper, packaging or cardboard web according to the preamble of claim 1, and to a method for coating using such an application device.
- These coatings can, for example, be the application of pigment-containing coating colors or barrier media, for example based on polyvinyl alcohol or micro-Znanofibrillated cellulose.
- Another common application is the application of a starch solution to the fibrous web. This can influence the surface of the web, while the starch application can also improve the strength properties of the fibrous web.
- the starch solution can be applied using a film press.
- the coating medium is applied in excess to the transfer roller and then dosed to the desired application quantity using suitable doctor blade dosing systems.
- the application quantity can be varied by doctoring off more or less of the excess coating medium. Changing the application quantity usually requires changing the doctor rod, which requires the machine to be stopped.
- doctor blade dosing systems are described, for example, in document DE102004029565 A1.
- application systems are known, for example from EP3332955 B1, in which the coating medium is sprayed onto the application rollers via a series of spray nozzles. In contrast to doctor blade dosing systems, these systems do not require contact dosing systems.
- DE202020107431 U1 describes a curtain nozzle with a uniform nozzle gap.
- DE 102022105518.3 describes an application nozzle in which a curtain or film is dispensed from a wide slot nozzle, which is then atomized by means of a blowing head.
- the properties of a paper web can vary significantly across the width of the web.
- the properties in the edge areas of the web can differ significantly from those in the middle.
- the starch is dosed so high that sufficient strength is achieved in the area with the highest demand, it will be overdosed in other areas, which makes neither economic nor ecological sense. If, on the other hand, the dose is too low, the edge areas of the sheet will generally be of inferior quality due to a lack of strength.
- An application device for coating a fibrous web, in particular a paper, packaging or cardboard web, wherein the application device comprises an application nozzle for applying a coating medium, in particular a starch solution, to a moving surface, and wherein the application nozzle has an outlet gap which is designed to produce a film of coating medium or a curtain of coating medium.
- the application nozzle has profiling means in order to vary the gap width of the outlet gap over the width of the application nozzle.
- the application nozzle and the outlet gap usually extend over the entire width of the fibrous web to be coated or over the entire width of the running surface. Since this fibrous web is usually somewhat narrower than the transfer roller, it can be provided that no coating medium is applied for a few centimeters at the edge of the transfer roller.
- the width of the application nozzle can therefore be up to 10m or more in modern systems.
- the gap width By varying the gap width, a very large range of order quantities can be covered in an elegant way. For example, if the gap width is If the thickness is increased from 0.5 mm to 1 mm, the application quantity can be doubled. If it is increased to 2 mm, it can even be quadrupled. Such large variations are advantageous for the system operator, as the properties of the web differ greatly from those in the middle of the web, particularly in the edge area due to shrinkage, so that significantly different amounts of starch may have to be applied in these areas. With application nozzles with an outlet gap, this strong profiling can be achieved very efficiently by locally adjusting the gap width.
- the application nozzle is designed as a curtain nozzle, in which the coating medium is deposited from the outlet gap in the form of a freely falling curtain onto the moving surface under the influence of gravity.
- the application nozzle further comprises a blow head which is designed to generate a linear jet of gaseous medium, and wherein an impact line is also provided at which the linear jet of gaseous medium impacts the film or curtain of coating medium to form a spray curtain, and wherein the blow head is arranged such that the spray curtain is directed in the direction of the moving surface.
- Air can be used in particular as the gaseous medium.
- the application nozzle has a diaphragm which extends in particular over the entire width of the application nozzle, and that the profiling means comprises a number of actuators which are arranged distributed over the width of the application nozzle and which are designed to locally open the outlet gap more or less by moving or deforming the diaphragm.
- the actuators can be designed, for example, as mechanical actuators and/or electromagnetic actuators.
- the mechanical actuators can be operated manually and/or by motor and/or hydraulically, for example.
- a design with adjusting screws or threaded spindles is possible.
- the cover can be made of metal, plastic or other suitable materials.
- the entire cover can be made of a magnetic material.
- the cover can be made of a non-magnetic material, such as a plastic, to which elements made of a magnetic material and/or suitable permanent magnets are attached for cooperation with the electromagnets.
- the profiling means comprise electromagnetic actuators which are arranged distributed over the width of the application nozzle and which are designed to locally vary the width of the outlet gap by varying the magnetic force.
- the width of the application nozzle 1 can be up to 10 m or more, it will often be useful to provide several actuators distributed over the width of the application nozzle to change the gap width.
- the mechanical actuators and/or the electromagnetic actuators are arranged unevenly distributed over the width of the application nozzle, wherein the distances between adjacent actuators at the edges of the application nozzle are smaller than in the middle of the application nozzle.
- This is particularly advantageous for balancing the shrinkage profile. Since the paper web shrinks very strongly at the edge but remains almost unchanged in the middle of the web, such profiles have strong gradients in the edge zones but remain largely constant in the middle. It is therefore advantageous to provide more actuators in the edge areas. For economic reasons, fewer actuators can be provided in the middle of the web.
- the application device has a control unit that is set up to automatically change the gap width.
- This control unit can, for example, be integrated into the central machine and system control. This enables a high degree of automation and, for example, the gap width can be adjusted based on measured or specified values from the machine control.
- the application device can be designed as a direct application device in which the coating medium is applied directly to the fibrous web as the running surface.
- the application device can also be designed as an indirect application device in which the coating medium is transferred from the running surface to the fibrous web.
- the running surface can be the surface of a transfer roller.
- the application device has a first application nozzle for application to a first running surface and a second application nozzle for application to a second running surface, wherein the first running surface and the second running surface are each designed as the surface of a transfer roller, and the two transfer rollers form a transfer nip in which the coating medium can be transferred to the fibrous web.
- Such application devices can be used for the simultaneous application, in particular of starch, to both sides of the fibrous web.
- the surface of the first transfer roller and/or the surface of the second transfer roller have a hardness of more than 55 ShoreD, in particular more than 90 ShoreD.
- An application device for applying starch that comprises two hard rollers is called a “hard nip sizer”. This allows particularly good penetration of the starch into the fibrous web.
- a method for coating a fibrous web in particular a paper, packaging or cardboard web, is proposed, wherein the coating is carried out by means of an application device according to one aspect of the present invention.
- the coating medium is a starch solution.
- the coating of the fibrous web takes place indirectly, whereby the coating medium is first applied to a moving surface in the form of a transfer roller and from there transferred to the fibrous web in a transfer nip.
- the method comprises the steps: a. specifying a default profile for the amount of coating medium to be applied across the width of the application nozzle and b. varying the gap width of the outlet gap across the width of the application nozzle so that the default profile is achieved.
- the default profile can be specified, for example, depending on the type of product produced. This default profile can be developed from experience or previous tests for the respective type. If a suitable control unit is available, the profile can be automatically adjusted when the type is changed without the need for a machine downtime.
- an actual profile of a property, in particular a strength property of the fibrous web, is determined and from this the specification profile for the coating medium is determined.
- the parameter can be determined directly by direct measurement or indirectly.
- the strength parameter can be modeled from a variety of measured variables. This can be a physical or purely statistical model, for example. Such model-based determinations of parameters are sometimes also called 'virtual sensors'.
- Figure 1 shows an application device according to one aspect of the invention
- Figure 2 shows an application device according to a further aspect of the invention.
- Figure 1 shows an application device with an application nozzle 1, which is designed as a curtain nozzle 1.
- the coating medium is deposited in the form of a freely falling curtain (14) on a moving surface 4.
- the moving surface 4 is designed as the surface of a transfer roller. From this transfer roller, the coating medium can be transferred to the web in a transfer nip. Alternatively, the curtain of coating medium 14 can also be applied directly to a fibrous web.
- the application nozzle 1 usually extends over the entire width of the running surface 4, at least over the entire width of the fibrous web to be coated. Since this fibrous web is usually somewhat narrower than the transfer roller, it can be provided that no coating medium is applied to the edge of the transfer roller for a few centimeters.
- the coating medium leaves the curtain nozzle through an outlet gap 2 with the width W.
- the gap width W correlates with the amount of coating medium released.
- the profiling means for varying the gap width W comprise a diaphragm 101 that extends across the width of the application nozzle 1.
- This diaphragm 100 can be made of metal or plastic.
- This diaphragm 101 is arranged on the outlet gap 2 in such a way that by locally moving or deforming the diaphragm 101, the outlet gap 2 can be more or less closed or opened, and thus the local gap width W can be varied.
- the profiling means further comprise suitable actuators 102.
- These actuators 102 can be designed as mechanical actuators 103, for example in the form of threaded spindles 103. These can be operated manually or by motor or even hydraulically.
- the actuators 102, 103 are arranged unevenly distributed over the width of the application nozzle 1, with the distances neighboring actuators 102 at the edges of the application nozzle 1 are smaller than in the middle of the application nozzle 1. This is particularly advantageous for compensating the shrinkage profile. Since the paper web shrinks very strongly at the edge but remains almost unchanged in the middle of the web, such profiles have strong gradients in the edge zones but remain largely constant in the middle. Therefore, for economic reasons, fewer actuators can be provided in the area of the middle of the web.
- FIG. 2 shows an application device according to a further aspect of the invention.
- the application nozzle 1 again has a nozzle head which has an outlet gap 2 which extends in the width direction of the application nozzle 1.
- the coating medium is dispensed in the form of a film 15 which is deposited on a support surface 7.
- This support surface 7 can be designed as a separate component. Alternatively, it can also be provided that part of the wall of the application nozzle 1 is used as the support surface 7.
- the application nozzle 1 has a blow head 5 which is designed to generate a linear jet of gaseous medium, and wherein an impact line is also provided at which the linear jet of gaseous medium impacts the film 15 of coating medium and forms a spray curtain 6.
- the blow head 5 is arranged such that the spray curtain 6 is directed in the direction of the running surface 4.
- the profiling is not carried out by varying the blowing head 5 or the jet of gaseous medium, but by varying the width W of the outlet gap 2.
- Suitable profiling means are provided on the application nozzle for this purpose.
- adjusting means 102 in the form of electromagnetic actuators 105 are provided here. These are arranged distributed over the width of the application nozzle 1, and are designed to locally vary the width of the outlet gap by varying the magnetic force.
Landscapes
- Paper (AREA)
- Coating Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102023106579.3A DE102023106579A1 (de) | 2023-03-16 | 2023-03-16 | Auftragsvorrichtung und Verfahren |
| PCT/EP2024/053581 WO2024188568A1 (de) | 2023-03-16 | 2024-02-13 | Auftragsvorrichtung und verfahren |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP4680804A1 true EP4680804A1 (de) | 2026-01-21 |
| EP4680804B1 EP4680804B1 (de) | 2026-08-19 |
Family
ID=89942585
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP24705420.8A Active EP4680804B1 (de) | 2023-03-16 | 2024-02-13 | Auftragsvorrichtung und verfahren |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20260009187A1 (de) |
| EP (1) | EP4680804B1 (de) |
| CN (1) | CN120813742A (de) |
| DE (1) | DE102023106579A1 (de) |
| WO (1) | WO2024188568A1 (de) |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE29622365U1 (de) * | 1996-12-23 | 1997-06-19 | Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim | Auftragswerk zum direkten oder indirekten Auftragen eines flüssigen oder pastösen Mediums auf eine laufende Materialbahn |
| DE19844979A1 (de) * | 1997-05-27 | 2000-04-06 | Voith Sulzer Papiermasch Gmbh | Verfahren zum direkten oder indirekten Auftragen eines flüssigen oder pastösen Auftragmediums auf eine laufende Oberfläche |
| DE19946479A1 (de) * | 1999-09-28 | 2001-03-29 | Voith Paper Patent Gmbh | Verfahren und Vorrichtung zum Besprühen einer bewegten Faserstoffbahn |
| DE10001392A1 (de) * | 2000-01-14 | 2001-07-19 | Voith Paper Patent Gmbh | Auftragsvorrichtung |
| JP3432819B1 (ja) * | 2002-07-31 | 2003-08-04 | 株式会社メンテック | 液体吹付付与装置、それを使用した液体の吹き付け付与方法、及び薬液 |
| DE102004029565A1 (de) | 2004-06-18 | 2006-01-05 | Voith Paper Patent Gmbh | Rakelvorrichtung |
| SE535994C2 (sv) * | 2011-03-03 | 2013-03-19 | Mattssonfoeretagen I Uddevalla Ab | Metod och anordning för dosering och bestrykning |
| SE540051C2 (en) | 2016-12-08 | 2018-03-06 | Valmet Oy | A device for spraying a coating chemical onto a moving surface of a papermaking machine |
| DE102017118898B4 (de) * | 2017-08-18 | 2021-08-05 | Voith Patent Gmbh | Vorhangauftragswerk |
| DE202020107431U1 (de) | 2020-02-12 | 2021-01-22 | Voith Patent Gmbh | Vorhangdüse für den Einsatz bei hohen Temperaturen |
| DE102022105518B4 (de) | 2022-03-09 | 2024-03-21 | Voith Patent Gmbh | Auftragsdüse, Auftragswerk und Verfahren |
-
2023
- 2023-03-16 DE DE102023106579.3A patent/DE102023106579A1/de active Pending
-
2024
- 2024-02-13 WO PCT/EP2024/053581 patent/WO2024188568A1/de not_active Ceased
- 2024-02-13 CN CN202480018098.5A patent/CN120813742A/zh active Pending
- 2024-02-13 EP EP24705420.8A patent/EP4680804B1/de active Active
-
2025
- 2025-09-15 US US19/328,446 patent/US20260009187A1/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| CN120813742A (zh) | 2025-10-17 |
| EP4680804B1 (de) | 2026-08-19 |
| DE102023106579A1 (de) | 2024-09-19 |
| WO2024188568A1 (de) | 2024-09-19 |
| US20260009187A1 (en) | 2026-01-08 |
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