EP2146003A2 - Unité d'application de rideau - Google Patents

Unité d'application de rideau Download PDF

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Publication number
EP2146003A2
EP2146003A2 EP09163082A EP09163082A EP2146003A2 EP 2146003 A2 EP2146003 A2 EP 2146003A2 EP 09163082 A EP09163082 A EP 09163082A EP 09163082 A EP09163082 A EP 09163082A EP 2146003 A2 EP2146003 A2 EP 2146003A2
Authority
EP
European Patent Office
Prior art keywords
edge
curtain
scraper
coating
fibrous web
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.)
Withdrawn
Application number
EP09163082A
Other languages
German (de)
English (en)
Other versions
EP2146003A3 (fr
Inventor
Dr. Benjamin Méndez-Gallon
Robert Reisenauer
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 EP2146003A2 publication Critical patent/EP2146003A2/fr
Publication of EP2146003A3 publication Critical patent/EP2146003A3/fr
Withdrawn legal-status Critical Current

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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
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
    • B05C11/1039—Recovery of excess liquid or other fluent material; Controlling means therefor
    • 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 curtain applicator for coating a running paper, cardboard or other fibrous web with at least one liquid to pasty application medium in the form of a single or multi-layer curtain, which falls substantially to gravity following the fibrous web, with a above the Fiber web arranged curtain-order head.
  • the invention also relates to a method of coating and also an edge scraper.
  • a generic device and a method are for example from the DE -A1 102 32 949 known. It has been proposed that the application medium curtain can be guided or guided for a curtain application method and a corresponding curtain application unit by means of edge guides and corresponding emitted beams of an operating medium. Edge guides are also in the WO 03/049870 and the WO 03/049871 disclosed.
  • This embodiment of a curtain commissioned work is among other things from the EP-A1- 1 255 615 known and is referred to in professional circles as "Slide Die", ie Gleit Anlagendüse.
  • This so-called sliding layer nozzle contains at least two application medium chambers from which the medium in each case reaches a sliding surface of the sliding layer nozzle via a feed gap, which in turn merges in each case into a slot-shaped outlet nozzle.
  • the application medium emerging from the discharge nozzles arranged in parallel one behind the other overlaps one another.
  • this multilayer separates and falls down as a multilayer curtain either initially on an intermediate guide plate or directly on the substrate to be coated or the surface of the moving fibrous web.
  • the coating width can be equal to or less than the width of the fibrous web.
  • the edge of the curtain or film has a tendency, due to surface tension, to contract and form a thickening of the line at the edge of the layer.
  • curtain width is greater than the fibrous web width, it may therefore come to contamination of the fibrous web edges.
  • an "inboard mode" where the curtain width is less than the fibrous web width is preferred by the process operators or users of the apparatus.
  • an edge scraper is additionally arranged on at least one web side with which the application medium applied by means of a curtain to the surface of the fibrous web in the set coating width can be removed from the edge region of the coating width.
  • This achieves a final application width without unwanted edge thickening, which, on the one hand, can dry poorly and contaminate the web guide elements, etc., and on the other hand affect the quality of the coating layer.
  • the marginal application medium is therefore removed immediately after application. It can be scrapped purely mechanically from the edge. The removed or shaved medium can then flow outward.
  • a suction device is also provided for the application medium scraped off by means of the edge scraper.
  • the removed or shaved medium can be quickly and cleanly discharged to the outside and possibly recycled and introduced into the coating process.
  • edge scraper in the width direction of the curtain or the fibrous web is movable. This allows you to set exact, final job widths as well as a line-free edge.
  • the edge scraper can also be deflected suspended or designed to be liftable. He does not bother in a Splice trimgang the web or when retracting the web.
  • the edge scraper is downstream of the curtain applicator head and its edge guides or a line of impact of the curtain on the fibrous web downstream.
  • the edge scraper should preferably before the first subsequent deflection, in any case, but before the first drying be arranged.
  • the edge scraper ie, these elements are typically present on both sides of the machine
  • the removal or Abschabeprocess then takes place due to the movement of the fibrous web in the running direction.
  • a distance of the edge scraper to the impact line of the curtain between 5 and 500 mm.
  • the distance should not be greater than 2000mm, because until then the application medium has not yet solidified and therefore it can scrape off quite well and can also be vacuumed.
  • An expedient embodiment of the edge scraper is that it has at least one suction nozzle connected to a vacuum generating device as the suction device.
  • This suction nozzle is preferably designed as a slot die and aligned against the direction of movement of the fibrous web.
  • the suction nozzle has a slot height between 0.2 and 3.0 mm and a width between 10 and 50 mm.
  • the slot width corresponds approximately to the desired width of the uncoated edge.
  • the slot die should, according to another useful embodiment, have an offset between its upper and lower slot opening or scraper edges.
  • the offset should be between 1 and 10mm, with the larger the web speed, the larger value should be selected. It is also proposed to form the lower scraper edge at an acute angle ⁇ between 5 and 45 °.
  • the suction nozzle has a scraper chamber.
  • this opens a suction channel, wherein the suction channel can be connected from above, from the side or from the back to the scraper chamber.
  • lateral connection is considered preferable.
  • the suction channel can have any cross-sectional shape, for example a round or polygonal shape.
  • a shape which is approximately adapted to the cross-sectional shape of the slot nozzle is considered to be preferred because it allows a higher speed of the suction to be achieved.
  • suction channel projects with its suction opening into the scraper chamber.
  • suction opening which is opposite to the direction of movement of the fibrous web.
  • the edge scraper can act on both a supported, as well as an unsupported area of the fibrous web on this. With regard to the scraper effect but a support of the fibrous web at the level of the edge scraper is more advantageous.
  • the support can be done with a roller or a flat guide surface (support beams, endless belt, etc.), so that the edge scraper above these support or web guide elements can act.
  • the web support member is formed so that a resilient air cushion is formed between the web support member and the underside of the fibrous web, wherein the air cushion can substantially reach a thickness between 1 and 3mm.
  • the applicant's company describes and distributes such web support elements as so-called TopTurns.
  • TopTurns so-called TopTurns.
  • the object of the invention is also achieved with an edge scraper, which is characterized by the features of claim 13.
  • This Inventive edge scraper can be easily retrofitted in existing curtain coaters.
  • the object of the invention is also achieved by a method according to claim 14.
  • the edge scraper is pressed against the freshly coated fibrous web. By changing the angle of inclination of the scraper, the effectiveness of the edge removal can be changed.
  • a mechanical Beschabtation the edge is provided.
  • the application medium scraped off in this way can then be sucked off with a device connected to a vacuum generating device and removed to the outside.
  • FIG. 1 is a curtain applicator 1 for coating a running paper, cardboard or other fibrous web 2 with a liquid to pasty application medium M according to the prior art shown. It includes, in addition to some other not shown here units, such as gutters, air boundary layer control devices, measuring devices, feeders, etc. above the fibrous web 2 and spaced therefrom arranged curtain application head 3.
  • This application head 3 is designed as a sliding layer and running machine. For a multi-layer application, that is to say for each application medium M or M1 to Mn, the application head 3 has its own application medium chamber with supply gap, all of which on the surface of the curtain application head 3 each transition into a slot-shaped exit nozzle 4 to 4n for one each Application medium layer to be dispensed.
  • the outlet nozzles 4, 4n are arranged parallel to each other and in the direction of movement L of the fibrous web 2 in succession.
  • the curtain application head 3 has on its surface also a downwardly inclined and curved located sliding surface 5.
  • the sliding surface 5 merges into a separation or tear-off edge 6, which points in the direction of the fibrous web 2 to be coated. From this Ablettekante 6, which is indeed machine-wide, as the entire applicator head 3, the previously formed on the sliding surface 5 coating medium layer (or more superposed coating medium layers in multi-layer application) dissolves and forms or form a single or multi-layered Curtain 7 off.
  • the curtain 7 drops from the detaching edge 6 (here covered by the falling curtain 7) substantially following gravity, down onto the fibrous web 2 and deposits on its surface 2a as a coating layer AS.
  • the curtain applicator has 1 edge guides 8.
  • This edge guides are constructed strip-like and serve to guide the single or multilayer curtain 7 at least over a part of its fall path between the trailing edge 6 and the surface of the fibrous web 2 at its lateral edges 7a and 7b.
  • the edge guides 8 are adjustable in the width direction of the curtain 7 for setting a coating width BB or ensure the receipt of a line-free edge.
  • FIG. 2 a first embodiment of a curtain applicator 1a according to the invention is shown, which in order to avoid the unwanted edge thickening 9 (see FIG. 1 ) has an edge scraper 10 on at least one web edge 2.1.
  • This edge scraper 10 which is drawn on the left side of the image, is additionally capable of mechanically scrapping the application medium on the edge region R applied by means of a curtain 7 to the upper side 2a of the fibrous web 2 in the set coating width BB.
  • the excess, scrapped medium MÜ flows in the inboard driving, so when using the edge scraper 10 to the outside via a flow 11 from.
  • the edge scraper 10 is movable in the width direction of the fibrous web 2, as the horizontal arrow shows. During the Beschabtation the Randschaber 10 but still. The Beschabtation is then exclusively due to the edge scraper over in the direction L moved fibrous web. 2
  • FIG. 3 a second embodiment of a curtain applicator 1b according to the invention is shown.
  • This commissioned work additionally has a suction device 12 for the excess application medium MÜ scraped off by means of the edge scraper 10.
  • the suction is indicated by the vertical arrow.
  • edge scraper 10 is arranged downstream of the curtain applicator head 3 and the edge guides 8 or an impingement line 13 of the curtain 7 on the fibrous web 2 in the downstream direction (running direction L).
  • FIG. 4 shows an enlarged view of the edge scraper 10 with suction device 12 in section.
  • the edge scraper 10 has at least one suction nozzle 14, which is directed against the direction of movement L of the fibrous web 2.
  • the suction nozzle 14 has a slot height A between 0.2 and 3.0 mm and a width E between 10 and 50 mm.
  • the slot width results from the desired width of the uncoated edge.
  • the suction nozzle 14 has between its upper scraper edge 15 and its lower Schlitzö Maschinens- or scraper edge 16 an offset D, which is between 1 and 10mm. The greater the web speed, the larger the offset D should be.
  • the lower scraper edge 16 contacts the upper side or surface 2 a of the fibrous web 2 and, so to speak, scrapes the application layer AS (which in each case is the upper layer in the case of a multi-coated layer) cleanly.
  • the scraper edge 16 is formed at an acute angle at an angle ⁇ between 5 and 45 °.
  • the suction nozzle 14 also has a rear shoulder B, which lies on the side facing away from the lower scraper edge 16 side and about 2 to 8mm high. This design is intended to prevent backflow of the scraped-off medium.
  • the suction nozzle 14 also has a scraper chamber 17 into which a suction channel 18 of the suction device 12 opens.
  • the suction channel 18 may be formed in any cross-sectional shape. Its suction opening 19 is arranged at a distance C from the bottom of the edge scraper 10 or the scraper chamber 17, the distance C being approximately 4 to 20 mm.
  • the effective direction of the suction opening 19 is preferably opposite to the direction of movement of the fibrous web 2.
  • FIG. 5 shows an overall view of the curtain applicator 1 b according to the invention with edge scraper 10 and the suction device 12 including medium return lines 20.
  • edge scraper 10 is arranged in the selected example at a distance F to the impact line 13 of the curtain 7. This distance the scraper 10 maintains during the Beschabtation.
  • FIGS. 6 and 7 show that the edge scraper 10 is associated with a located below the fibrous web 2 web support member 23.
  • the support can be done with a roller or a flat guide surface (support beams, endless belt, etc.), so that the edge scraper 10 can act above this support or web guide element 23.
  • the web support member 23 is resilient.
  • the web support member 23 is formed so that forms a resilient air cushion 24 between this element 23a and the bottom 2b of the fibrous web 2, wherein the air cushion 24 can substantially reach a thickness between 1 and 3mm.
  • the applicant's company describes and distributes such web support elements as so-called TopTurns.
  • TopTurns so-called TopTurns.
  • FIG. 8 shows a schematic plan view of a portion of an edge region R of a double and simultaneously coated fibrous web 2. It was used here not shown with curtain applicator 3.
  • the precoat or underscore 30 was in the experiment at 800m / min with a stroke weight of 7.5 g / m 2 and the top coat 40 applied at 8 g / m 2 . Due to the use of the edge scraper 10 according to the invention, including the extraction of scraped off in the edge region excess medium a very clean uncoated edge 50 has been achieved and edge thickening especially the top coat 30 avoided.

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  • Coating Apparatus (AREA)
  • Paper (AREA)
EP09163082A 2008-07-15 2009-06-18 Unité d'application de rideau Withdrawn EP2146003A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200810040403 DE102008040403A1 (de) 2008-07-15 2008-07-15 Vorhang-Auftragswerk

Publications (2)

Publication Number Publication Date
EP2146003A2 true EP2146003A2 (fr) 2010-01-20
EP2146003A3 EP2146003A3 (fr) 2012-01-25

Family

ID=41076718

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09163082A Withdrawn EP2146003A3 (fr) 2008-07-15 2009-06-18 Unité d'application de rideau

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EP (1) EP2146003A3 (fr)
DE (1) DE102008040403A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012010511A1 (fr) * 2010-07-20 2012-01-26 Voith Patent Gmbh Coucheuse rideau
WO2013167771A1 (fr) * 2012-05-07 2013-11-14 Xavier Blanch Andreu Dispositif pour l'application de produit liquide sur une feuille de papier
EP2985386A1 (fr) 2014-08-11 2016-02-17 Blanch Andreu, Xavier Dispositif de pulvérisation permettant de pulvériser un produit liquide sur une feuille de papier
CN110860428A (zh) * 2019-12-23 2020-03-06 安徽思普特新型材料有限公司 一种线条覆网涂装一体化生产线及其生产方法
CN112657714A (zh) * 2020-12-14 2021-04-16 杭州中易杭建筑工程有限公司 一种橡胶防水卷材制备工艺
WO2021258315A1 (fr) * 2020-06-24 2021-12-30 南京昆程仕科技有限公司 Nouvelle machine de revêtement automatique

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1255615A1 (fr) 2000-01-26 2002-11-13 Tetra Laval Holdings & Finance S.A. Procede de fabrication d'un lamine d'emballage multicouche et lamine d'emballage obtenu selon ce procede
WO2003049870A1 (fr) 2001-12-13 2003-06-19 Dow Global Technologies Inc. Procede et dispositif d'enduction au rideau
WO2003049871A1 (fr) 2001-12-13 2003-06-19 Dow Global Technologies Inc. Procede et appareil de couchage par voile
DE10232949A1 (de) 2002-07-19 2004-01-29 Voith Paper Patent Gmbh Vorhang-Auftragsvorrichtung

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3605613A1 (de) * 1986-02-21 1987-08-27 Jagenberg Ag Streichvorrichtung zum beschichten von warenbahnen
DE10316999A1 (de) * 2003-04-11 2004-10-28 Bachofen & Meier Ag Vorrichtung zum Beschichten einer laufenden Materialbahn
FI117176B (fi) * 2005-01-27 2006-07-14 Metso Paper Inc Laite tasolta syöttävän verhopäällystimen applikointileveyden säätämiseksi

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1255615A1 (fr) 2000-01-26 2002-11-13 Tetra Laval Holdings & Finance S.A. Procede de fabrication d'un lamine d'emballage multicouche et lamine d'emballage obtenu selon ce procede
WO2003049870A1 (fr) 2001-12-13 2003-06-19 Dow Global Technologies Inc. Procede et dispositif d'enduction au rideau
WO2003049871A1 (fr) 2001-12-13 2003-06-19 Dow Global Technologies Inc. Procede et appareil de couchage par voile
DE10232949A1 (de) 2002-07-19 2004-01-29 Voith Paper Patent Gmbh Vorhang-Auftragsvorrichtung

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012010511A1 (fr) * 2010-07-20 2012-01-26 Voith Patent Gmbh Coucheuse rideau
WO2013167771A1 (fr) * 2012-05-07 2013-11-14 Xavier Blanch Andreu Dispositif pour l'application de produit liquide sur une feuille de papier
EP2985386A1 (fr) 2014-08-11 2016-02-17 Blanch Andreu, Xavier Dispositif de pulvérisation permettant de pulvériser un produit liquide sur une feuille de papier
EP2985385A1 (fr) 2014-08-11 2016-02-17 Xavier Blanch Andreu Dispositif de pulvérisation permettant de pulvériser un produit liquide sur une feuille de papier
CN110860428A (zh) * 2019-12-23 2020-03-06 安徽思普特新型材料有限公司 一种线条覆网涂装一体化生产线及其生产方法
WO2021258315A1 (fr) * 2020-06-24 2021-12-30 南京昆程仕科技有限公司 Nouvelle machine de revêtement automatique
CN112657714A (zh) * 2020-12-14 2021-04-16 杭州中易杭建筑工程有限公司 一种橡胶防水卷材制备工艺

Also Published As

Publication number Publication date
EP2146003A3 (fr) 2012-01-25
DE102008040403A1 (de) 2010-01-21

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