EP2096209B1 - Station de couchage - Google Patents

Station de couchage Download PDF

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Publication number
EP2096209B1
EP2096209B1 EP09152921A EP09152921A EP2096209B1 EP 2096209 B1 EP2096209 B1 EP 2096209B1 EP 09152921 A EP09152921 A EP 09152921A EP 09152921 A EP09152921 A EP 09152921A EP 2096209 B1 EP2096209 B1 EP 2096209B1
Authority
EP
European Patent Office
Prior art keywords
vacuum
application medium
aerator
coating station
filter
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.)
Not-in-force
Application number
EP09152921A
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German (de)
English (en)
Other versions
EP2096209A1 (fr
Inventor
Stefan Reich
Uwe Fröhlich
Peter Stuffer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
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
Publication of EP2096209A1 publication Critical patent/EP2096209A1/fr
Application granted granted Critical
Publication of EP2096209B1 publication Critical patent/EP2096209B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • D21H23/46—Pouring or allowing the fluid to flow in a continuous stream on to the surface, the entire stream being carried away by the paper
    • D21H23/48—Curtain coaters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/007—Slide-hopper coaters, i.e. apparatus in which the liquid or other fluent material flows freely on an inclined surface before contacting the work
    • B05C5/008—Slide-hopper curtain coaters

Definitions

  • the invention relates to a coating station for coating a running paper, cardboard or other fibrous web with at least one liquid to pasty application medium, comprising a above the fibrous web and spaced therefrom arranged applicator head of a curtain applicator, the at least one application medium in the form of a curtain emits to the fibrous web, the applicator a vacuum deaerator for degassing or venting of at least one application medium is connected upstream, with a discharge line for degassed application medium, a vacuum generating device and a discharge line for separated air or gas is present and the vacuum deaerator Mixer and / or reservoir containing processing station is connected upstream.
  • coating color in general terms, the application medium
  • a doctoring element In conventional coating methods, such as the blade or film coating, coating color (in general terms, the application medium) is applied in multiple excess and then metered with a doctoring element.
  • the modern curtain coating eliminates the dosage because there is no excess. That is, when curtain coating only the amounts are applied, which should ultimately remain on the substrate. Consequently, the amounts of ink that must be supplied to the curtain applicator are very low.
  • the curtain coating requires a nearly complete venting of the coating color because of the Commissioned and delivered curtain is very sensitive. Gas or air contents also cause problems in the system before the actual coating.
  • the applicant's company has therefore submitted proposals such that the largest possible surface area of the medium to be degassed or vented is created, which can improve the venting effect. In addition, the venting is carried out under the influence of a vacuum.
  • the known per se vacuum deaerator additional work space contains.
  • the otherwise necessary additional locally close to the commissioned work container - to achieve a short line path - is completely omitted according to the invention, which is why the required working volume is integrated into the here slightly enlarged vent container.
  • This additional working space is achieved by dividing the total volume of the deaerator into two sections.
  • the upper area serves for ventilation. In this upper area so the medium to be vented is surrounded by the gas phase.
  • the lower area so the additional working space is provided for storing the vented medium and is filled by a level control in operation to the desired level completely with the application medium.
  • the following commissioned work can work with this deaerated discharge medium present here.
  • This room contains nearly 100% application medium. as a memory.
  • the required application medium is removed via a discharge pump as required. In this case, such a regulation takes place according to which the medium to be deaerated is introduced into the upper area and is vented there. This deaerated medium then refills the lower area.
  • the advantage of this solution is that the storage made here takes place under venting pressure, whereby a consistently good quality of the venting of the application medium, ie the coating color, can be achieved.
  • a very useful embodiment of the coating station is obtained by, for example, known cascade-like installations with eg turntables, return plates, etc., which perform a multiple or stepwise degassing or venting are arranged in the upper region of the venting container.
  • the application medium is existent only as a thin film or color droplets.
  • the volume of this upper area is filled only by about 5% liquid application medium plus solids and about 95% gas phase (air and / or water vapor) in this embodiment.
  • the coating station according to the invention can expediently be further developed by opening at least one supply line from the at least one application medium processing station, as well as at least one return line from the curtain application unit, directly into the at least one vacuum deaerator.
  • a particular advantage is the only short return between the commissioned work and the deaerator. Under reflux, the medium content, which is kept away from the edge of the web, and is returned via a bypass line and such medium, which is released in coating pauses further from the commissioned work, collected and returned, to understand.
  • an idle protection or accumulation control provided.
  • This comprises a collection element, e.g. a collection container of low volume, which is followed by a control valve.
  • the coating station may comprise a plurality of mixers and possibly a plurality of associated storage containers.
  • each mixer and the said reservoir can be located outside the coating station, even outside the building accommodating the coating station, in the case of separate working containers no longer present according to the invention, a shortened circulation from the mixer or storage container to the ventilator is particularly significant.
  • deaerator there may be at least one deaerator per medium to be applied. It is also possible to use several deaerators for only a single application medium. The latter option makes sense for very wide machines.
  • Another very advantageous embodiment variant of the coating station according to the invention results from the fact that their individual units, such as vacuum deaerator, filters and measuring devices are mounted on a common frame. This makes it possible to create a very compact workstation. This leaves Add to existing paper manufacturing machines and expand them again. Overall, the maintenance, cleaning and machinery costs are much lower than before. In addition, the accessibility to the individual units is improved and also created a location near the commissioned work. If you have more than one job media, you can have more than one frame.
  • the working space (lower area) of the vacuum deaerator has a working volume of about 100 to 2000 l, preferably 200 to 1500 l of medium.
  • a filter is installed in the discharge line for the vented application medium and / or in the return line between the vacuum venting container and the commissioned work.
  • a filter is installed in the discharge line for the vented application medium and / or in the return line between the vacuum venting container and the commissioned work.
  • commercially available, relatively inexpensive and effective cartridge filters or rotary filters are available.
  • At least one membrane degassing device is installed in the return line between the vacuum venting container and the applicator unit. This can be installed before and / or behind an existing filter.
  • the curtain applicator is both a single-layer, as well as a multi-layer curtain application to a paper carton or other fibrous web is possible. Accordingly, according to the number of applied to the fibrous web application media or coating color layers, a corresponding number of vacuum vents and mixers and / or Reservoirs be provided per to be vented coating color. But this also means that a single vent tank, a single mixer and reservoir can also serve several supply chambers of the commissioned work.
  • the advantage of the coating station according to the invention is that it is on the one hand very compact and still requires little space, less cleaning and device overhead, and on the other hand that when changing grades coating color losses are lower than before.
  • FIG. 1 shows a compact coating station 1 for coating a running in the direction L paper, cardboard or other fibrous web 2 with a liquid to pasty application medium.
  • the coating station 1 comprises a curtain applicator 4 with a curtain application head 5 arranged above the fibrous web 2 and spaced from it.
  • the application head 5 has, for each application medium 3 to be applied for a multi-layer application, its own application chamber 7a to 7n, which in each case merges into a supply gap 8a-8n with a corresponding exit nozzle 9a-9n.
  • the discharge nozzle (s) opens (s) on the surface 10 of the example in the form of a nozzle block (slide, ie, Gleit Hardüse trained application head 5, wherein in multi-layer order the media discharged from the outlet nozzles 9a - 9n superimposed on the surface 10 and a create multi-layered curtain.
  • the draining curtain 6 then generates an application medium layer 11 corresponding to the desired number of application layers on the fibrous web 2.
  • the applicator 4 or the applicator head 5 is preceded by a vacuum vent 12, which in turn is preceded by a coating medium processing station 13.
  • This application medium processing station 13 comprises at least one mixer 13.1 and at least one storage container 13.2.
  • the mixer 13.1 contains a strong stirrer and usually also has several feeds.
  • the storage tank is used only for storage of the respective application medium and contains only a simple agitator for circulation. Mixer and reservoir can be far apart from the commissioned work spatially. Accordingly long then the connecting pipes are to be executed.
  • the preparation of the application medium can be carried out continuously, which is preferably done without reservoir 13.2.
  • the application medium is fed directly from the mixer 13.1 from the breather 12.
  • the preparation of the application medium can also be discontinuous, which is referred to as "batchwise.” For this, however, one works with the storage container 13.2, from which the application medium is then fed directly to the breather 12. From the FIG. 1 can be removed that the vacuum vent 12 is provided in its upper portion 16 with cascade-like fittings 17 for multiple degassing or venting of the application medium 3. These cascaded internals 17 are formed as a turntable 17a and are driven via a common motor 18 via a vertical shaft 19. In this case, a speed of about 1500 min -1 is reached.
  • the application medium 3 to be deaerated is thrown from each turntable 17a or each cascade outwards to the container wall 12a, bounces there and then passes from there via oblique guides 17b down to the next turntable, whereby the application medium 3 is further vented in the same mode. This takes place until the partially degassed application medium has reached a lower region 20 of the end-ventilation container 12.
  • This area 20 serves as an additional working space 21. It has a working volume of on average about 1000 l of medium (per ventilator), which is directly available for the commissioned work.
  • the vacuum deaerator 12 is therefore located very close to the commissioned work 5 and also takes on its return.
  • the almost completely deaerated application medium 3a is fed via a discharge line 22 to the applicator 5 or the curtain application head so to speak bubble-free by means of a discharge pump 23.
  • a filter 24 in the example shown, i. a commercial cartridge filter installed, so that impurities in the commissioned work are almost impossible, creating a high-quality and uniformly closed trained application layer 11 is achieved on the fibrous web 2.
  • the idle protection 29 includes a back-up control with a collecting element 29.1 (eg small container) and a downstream control valve 29.2 or entry pump.
  • the vacuum deaerator 12 and other structural units, such as filter 24 and measuring point 26, etc., are otherwise mounted on a common frame 30, so that there is a close-spaced, easy vorzumontierende compact workstation.
  • a close-spaced, easy vorzumontierende compact workstation Of advantage here are the short cycles of the medium and also the associated pipe work. For example, three media to be applied, three frames 30 could be present.
  • FIG. 1 is also shown that at least one Membranentgasungsvortechnisch 34 is installed in the discharge line 22 for the deaerated application medium 3a between the vacuum vent tank 12 and the curtain coater 4.
  • Said Membranentgasungsvortechnische 34 may be installed before and / or after the filter 24. In the FIG. 1 Therefore, the presence of a second Membranentgasungsvortechnisch 34 is shown in dashed lines.
  • This additional degassing works, as the name implies, with a membrane module consisting of a single membrane or a plurality of membranes for the separation of gas, in particular dissolved gas from the coating medium.
  • the membrane is preferably made of hydrophobic material.
  • Add is that shown in the FIG. 1 an example with a single-layer order of the application medium 3 (see supply via line 22 to the middle application chamber 8 and bypass line 26 from this application chamber back into the breather 12) is shown.
  • This order could also be multilayer, for example, two, three or n-layered, which is why in these cases, the number ofEntmediumskammem with feed columns and outlet nozzles and the number of breather 12, mixer 13.1 and reservoir 13.2 could be increased accordingly.
  • only a single vacuum venting container 12 for the application medium 3 is shown.
  • FIG. 2 a further variant of the coating station 1 is shown. It essentially corresponds to that of FIG. 1 , which is why the figures are also essentially those of FIG. 1 corresponds and a corresponding explanation is not repeated here.
  • a further filter 31 incorporated, the same time as a collection container serves.
  • This filter 31 may be any known filter, such as a rotary filter or a cartridge filter. But other designs are also possible.
  • a control valve 32 is installed in the said line 26, which serves a controlled dosing of the application medium. It regulates the level in the filter 31 or the level in a pipeline.
  • the filter 24 only acts as a so-called police filter and is of smaller design.
  • a dashed line further supply line 33 is shown, which branches off from the feed line 14 in the breather 12 (solid line) and leads into the filter 31. This feed can alternatively be used to additionally guide fresh application medium or fresh coating color from the application medium preparation station 13 into the filter 31.
  • the vacuum deaerator 12 is supplied with this filtered application medium via the said line 26 and the control valve 32, as stated, instead of the direct feed line by means of a continuous feed line 14.
  • a coating medium for example, a microcapsules contained Strech-containing Strech-containing Strech-containing Strech-containing Strech-containing Strech-containing Strech-containing Strech-containing Strech-containing Strech-containing Strech-containing Strech-containing Strech-containing Strech-containing Strech-containing Strech-containing Strech-containing Strech-containing Strech-containing Strech-containing Strech-containing Strech-containing Strech-containing Strech-containing Strech- having a solids content of 32% and a viscosity of 240 mPas was vented. Before deaeration, the gas content in the coating color was 2-25% and after deaeration less than 0.2%.

Landscapes

  • Coating Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Degasification And Air Bubble Elimination (AREA)
  • Paper (AREA)
  • Manufacturing And Processing Devices For Dough (AREA)
  • Fertilizers (AREA)
  • Nozzles (AREA)

Claims (15)

  1. Station de couchage (1) pour le revêtement d'une bande de papier, de carton ou d'une autre matière fibreuse en mouvement (2) avec au moins un agent de couchage liquide à pâteux (3), comprenant une tête de dépôt (5), disposée au-dessus de la bande de matière fibreuse (2) et à distance de celle-ci, d'une unité de dépôt en rideau (4), qui délivre ledit au moins un agent de couchage (3) sous la forme d'un rideau (6) sur la bande de matière fibreuse (2), dans laquelle un désaérateur à vide (12) pour le dégazage ou la désaération dudit au moins un agent de couchage (3) est installé avant l'unité de dépôt (4), dans laquelle le désaérateur à vide (12) comprend une conduite d'extraction (22) pour l'agent de couchage dégazé (2a), un système de production de vide (27) et une conduite d'extraction (28) pour l'air ou le gaz séparé et une station de préparation de l'agent de couchage (13) comprenant des mélangeurs (13.1) et/ou des réservoirs de stockage (13.2) est installée avant le désaérateur à vide (12), caractérisée en ce que le désaérateur à vide (12) comporte une chambre de travail supplémentaire (21), de telle manière que le désaérateur à vide (12) soit divisé en deux zones de son volume total, dans laquelle la zone supérieure (16) sert pour la désaération de l'agent de couchage (3) et la zone inférieure (20) forme la chambre de travail supplémentaire (21) pour le stockage de l'agent de couchage (3a) désaéré.
  2. Station de couchage (1) selon la revendication 1, caractérisée en ce que la zone supérieure (16) du désaérateur à vide (12) est pourvue d'équipements en cascade (17) pour le dégazage ou la désaération.
  3. Station de couchage (1) selon la revendication 1, caractérisée en ce que la conduite d'extraction (22) pour l'agent de couchage dégazé (3a) est dérivée de la zone inférieure (20) du désaérateur à vide (12) et le système de production de vide (27) est relié à la zone supérieure (16) du désaérateur à vide (12) par une conduite d'extraction (28) pour l'air ou le gaz séparé, dans laquelle aussi bien au moins une conduite d'alimentation (14) provenant de ladite au moins une station de préparation d'agent de couchage (13) qu'au moins une conduite de retour (26) provenant de l'unité de dépôt en rideau (4), débouchent chacune directement dans la zone supérieure (16) du désaérateur à vide (12).
  4. Station de couchage (1) selon au moins une des revendications précédentes, caractérisée en ce que la chambre de travail supplémentaire (21) présente un volume de travail pour l'agent de couchage d'environ 100 à 2000 l, de préférence de 200 à 1000 l.
  5. Station de couchage (1) selon au moins une des revendications précédentes, caractérisée en ce qu'un filtre (24) est installé dans la conduite d'extraction (22) pour l'agent de couchage désaéré (3a) entre le désaérateur à vide (12) et l'unité de dépôt en rideau (4).
  6. Station de couchage (1) selon la revendication 5, caractérisée en ce qu'au moins un dispositif de dégazage à membrane (34) est installé dans la conduite d'extraction (22) pour l'agent de couchage désaéré (3a) entre le désaérateur à vide (12) et l'unité de dépôt en rideau (4).
  7. Station de couchage (1) selon la revendication 6, caractérisée en ce qu'au moins un dispositif de dégazage à membrane (34) est installé avant ou après le filtre (24).
  8. Station de couchage (1) selon au moins une des revendications précédentes, caractérisée en ce qu'un dispositif de mesure (25), en particulier pour la mesure de la teneur en gaz ou en air, est installé dans la conduite d'extraction (22) entre le désaérateur à vide (12) et l'unité de dépôt (4).
  9. Station de couchage (1) selon au moins une des revendications précédentes, caractérisée en ce qu'un filtre (31) est installé dans au moins une des conduites de retour (26) partant de l'unité de dépôt (4) et débouchant dans le désaérateur à vide (12).
  10. Station de couchage (1) selon la revendication 7 et/ou 9, caractérisée en ce qu'il est prévu comme filtre (24, 31) un filtre à cartouche ou un filtre tournant disponible dans le commerce.
  11. Station de couchage (1) selon la revendication 9 ou 10, caractérisée en ce qu'une conduite d'alimentation (33) pour de l'agent de couchage frais, provenant de la station de préparation (13) comprenant des mélangeurs (13.1) et/ou des réservoirs de stockage (13.2), débouche dans le filtre (31) et en ce que l'agent de couchage filtré dans le filtre (31) peut être introduit dans le désaérateur à vide (12) via la conduite (26) et au moyen d'une soupape (32).
  12. Station de couchage (1) selon au moins une des revendications précédentes, caractérisée en ce que l'agent de couchage frais provenant de la station de préparation (13) comprenant des mélangeurs (13.1) et/ou des réservoirs de stockage (13.2) ne peut être introduit dans le désaérateur à vide (12) que par la conduite (14).
  13. Station de couchage (1) selon au moins une des revendications précédentes, caractérisée en ce qu'une protection contre la marche à vide (29), comprenant un élément de collecte (29.1) et une soupape de régulation (29.2), est installée dans la conduite de retour (dérivation) (26).
  14. Station de couchage (1) selon au moins une des revendications précédentes, caractérisée en ce qu'il est prévu au moins un désaérateur à vide (12) par agent de couchage (3) à désaérer.
  15. Station de couchage (1) selon au moins une des revendications précédentes, caractérisée en ce que le/les désaérateur(s) à vide (12) ainsi que les filtres (24) et les dispositifs de mesure (25) sont montés sur un châssis commun (30).
EP09152921A 2008-02-29 2009-02-16 Station de couchage Not-in-force EP2096209B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008000451A DE102008000451A1 (de) 2008-02-29 2008-02-29 Streichstation

Publications (2)

Publication Number Publication Date
EP2096209A1 EP2096209A1 (fr) 2009-09-02
EP2096209B1 true EP2096209B1 (fr) 2010-10-13

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP09152921A Not-in-force EP2096209B1 (fr) 2008-02-29 2009-02-16 Station de couchage

Country Status (6)

Country Link
EP (1) EP2096209B1 (fr)
JP (1) JP3152498U (fr)
CN (1) CN201783434U (fr)
AT (1) ATE484627T1 (fr)
DE (2) DE102008000451A1 (fr)
ES (1) ES2353365T3 (fr)

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GB201107801D0 (en) * 2011-05-11 2011-06-22 Delta Print & Packaging Ltd Method and apparatus for applying a protective barrier coating to a substrate
DE102012012302A1 (de) * 2012-06-20 2013-12-24 Bvg Bauer Verfahrenstechnik Gmbh Bypass Filtration
JP6218219B2 (ja) * 2013-07-12 2017-10-25 東レエンジニアリング株式会社 エアベントシステム
DE102013018554A1 (de) * 2013-11-06 2015-05-07 Dürr Systems GmbH Applikationsanlage zur Applikation eines Beschichtungsmittels
CN106269333A (zh) * 2016-08-04 2017-01-04 深圳朝伟达科技有限公司 管道内发泡剂或者起泡密封剂涂敷方法
JP6838945B2 (ja) * 2016-11-18 2021-03-03 三菱重工機械システム株式会社 液体混合装置および液体混合方法
CN106423738A (zh) * 2016-11-28 2017-02-22 天津力神电池股份有限公司 一种连续稳定的涂敷在线点胶设备
DE202020103014U1 (de) 2020-05-27 2020-06-05 Voith Patent Gmbh Beschichtungsvorrichtung
KR102403223B1 (ko) * 2020-10-27 2022-05-31 주식회사 송학건설 휘발성 유기화합물 흡착제의 코팅장치
EP4309757A1 (fr) * 2022-07-19 2024-01-24 Covestro Deutschland AG Dispositif de dégazage pour extraire un gaz à partir d'un fluide visqueux et procédé de dégazage
CN115383361B (zh) * 2022-09-21 2025-09-05 歌尔科技有限公司 一种助焊剂补给装置

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DE102005060848A1 (de) 2005-12-16 2007-06-28 Voith Patent Gmbh Verfahren und Vorrichtung zum Entgasen eines flüssigen bis pastösen Mediums
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020114120A1 (de) 2020-05-27 2021-12-02 Voith Patent Gmbh Beschichtungsvorrichtung
DE102020114120B4 (de) 2020-05-27 2022-03-31 Voith Patent Gmbh Beschichtungsvorrichtung

Also Published As

Publication number Publication date
ATE484627T1 (de) 2010-10-15
CN201783434U (zh) 2011-04-06
JP3152498U (ja) 2009-08-06
DE102008000451A1 (de) 2009-09-03
DE502009000125D1 (de) 2010-11-25
ES2353365T3 (es) 2011-03-01
EP2096209A1 (fr) 2009-09-02

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