EP3006115A1 - Method and device for curtain coating - Google Patents
Method and device for curtain coating Download PDFInfo
- Publication number
- EP3006115A1 EP3006115A1 EP15002751.4A EP15002751A EP3006115A1 EP 3006115 A1 EP3006115 A1 EP 3006115A1 EP 15002751 A EP15002751 A EP 15002751A EP 3006115 A1 EP3006115 A1 EP 3006115A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- curtain
- free
- paper
- board web
- edge
- 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
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000007766 curtain coating Methods 0.000 title description 5
- 238000000576 coating method Methods 0.000 claims abstract description 43
- 239000011248 coating agent Substances 0.000 claims abstract description 42
- 239000007788 liquid Substances 0.000 claims abstract description 24
- 230000001154 acute effect Effects 0.000 claims abstract description 9
- 230000035515 penetration Effects 0.000 claims description 5
- 235000011837 pasties Nutrition 0.000 claims description 4
- 239000000758 substrate Substances 0.000 claims 1
- 239000010410 layer Substances 0.000 description 8
- 238000000926 separation method Methods 0.000 description 7
- 239000011324 bead Substances 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000003973 paint Substances 0.000 description 4
- 230000005484 gravity Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000007664 blowing Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
Images
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
- 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
- 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
-
- 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
- B05C9/06—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 two different liquids or other fluent materials, or the same liquid or other fluent material twice, to the same side of the work
Definitions
- the invention relates to a method and a device for curtain coating according to the preamble of claim 1 and claim 11.
- the coating When coating a paper or board web with a curtain applicator, the coating should be applied as evenly as possible over the entire web width in order to make good use of the advantages of contactless application.
- the application thickness must be as constant as possible over the entire web surface. The basic prerequisite for this is a uniform distribution of the coating over the outlet width with regard to the volume flow and the speed.
- the Curtain Coater can be used with a slot die or a cascade die.
- a slot die slot-fed die
- the curtain coater with a Slot nozzle are for example off DE 197 16 647 A1 and DE 10 2005 017 547 A1 known.
- the cascade nozzles (Slide-Fed Die) are used in the multilayer web coating.
- the coating material first flows from a distribution chamber upwards to the outlet gap. From the exit slit, the coating material flows on an inclined plane, where it is superimposed with the coating slips of the upper layers and then passed to the nozzle lip. Only at the trailing edge of the nozzle lip forms a curtain.
- the cascade nozzles are described for example in WO 01/54828 A1 and WO 2005/024133 A1 ,
- the curtain is accelerated in free fall due to gravity. As the distance from the exit edge of the nozzle increases, the curtain is drawn from the edges to the center by the action of gravity and surface tension. The width of the curtain is thereby narrower. In order to prevent the curtain from contracting, the curtain is guided by means of edge guiding elements at the edges.
- the width of the curtain can be greater than the web width in a so-called overboard mode.
- values of about 100 to 200 mm may be mentioned here.
- a simple embodiment of the edge guide elements is generally sufficient in order to ensure a high uniformity of the distribution of the coating compound in the edge region.
- a disadvantage is the adhesion of coating material to the underside of the paper or board web, as a result of which undesired contamination in the area of the coating zone occurs.
- the width of the curtain is less than or equal to the web width.
- the coating color in the edge area and in the middle must be distributed very evenly over the width of the web. It is important that the curtain hits the moving paper or board web at the same speed throughout the impact zone. Otherwise, problems would arise with the coating of the paper or board web in the form of edge beads and not dried edges result.
- edge guide elements for the inboard driving style are described for example in EP 0 907 103 A1 .
- EP 1 458 493 A1 and WO 02/081103 A1 are described for example in EP 0 907 103 A1 .
- EP 2 067 531 A2 EP 1 458 493 A1 and WO 02/081103 A1 ,
- separating elements which act on the free-falling curtain.
- a curtain interceptor having a separation edge is known to intercept and deflect a portion of the free-falling curtain near the overflow edge.
- EP 0 740 197 A1 and EP 0 841 588 A2 it is known to cut off both sides of the curtain by means of knives.
- a disadvantage of the use of separating elements is the adhesion of the paint on the separating element as well as the dust formation at the top of the separating element.
- the separating elements described above are therefore to be used in order to avoid the formation of a bead in the edge region, which otherwise results in that comparatively much coating color is applied to the edge. This would mean that the guide rollers and Airturns are contaminated with the paint. The bead of paint can be dried badly. The individual layers of paper stick together on the spool. Due to the disadvantageous adhesion of the coating color to the separating elements, such aids are maintenance-intensive and susceptible to wear.
- the invention is therefore based on the object to provide a method and apparatus for curtain coating with a curtain divider for the edge region of a curtain applicator, which allow a high uniformity of the distribution of the coating in the edge region.
- This provides a method and apparatus for curtain coating a moving paper or board web in which the free falling curtain is separated into a curtain center portion and at least one curtain edge using a separator having a free jet of release liquid.
- the curtain is stretched at the interface on an inner side and compressed on an outer side, wherein the inside and outside are related to the curtain middle part.
- the coating is thus distributed on the inside over a larger area.
- the layer thickness can consequently be reduced in the edge region and bead formation in the edge region on the paper or board web can be minimized. This applies equally to coatings of lower or higher viscosity, which can therefore be applied more uniformly. Function bars of selectable type can thus be applied improved with a small amount of coating, which also results in a cost advantage.
- the free jet cuts the curtain preferably from behind. At the interface behind the curtain then forms a meniscus-like curvature with the aforementioned advantages.
- a dispenser for forming a curtain falling on a coating side of the paper or board web in free fall may form a curtain having a width that is less than or greater than the width of the moving paper or board web and / or its backing ,
- the subject invention is applicable to overboard driving as well as inboard driving.
- the separation of the curtain can be carried out by selecting the spatial position of the penetration area such that the entrained curtain edge forwarded and the curtain middle part in the manner of the inboard driving the paper or board web coated, without the beading on the edge of the coating, which is applied through the curtain middle part on the paper or board web.
- the overboard driving style can be converted into an in-board driving style, wherein at the edge of the coating by the curtain middle part no bead is formed or at least the bead formation is minimized.
- the invention relates to a device for applying at least one layer 1 of a liquid or pasty application medium to a moving paper or board web 2 using a curtain applicator.
- a curtain applicator known devices can be used, in particular the so-called curtain coater. From the curtain applicator is in Fig. 1 and Fig. 2 only the curtain divider according to the invention with the associated parts shown.
- the curtain applicator comprises a transport device for moving a support 3 for the paper or board web 2 through a coating zone 4.
- the support 3 is here designed, for example, as a support roller.
- the curtain applicator further comprises a dispenser (not shown) for forming a free-falling curtain 5 of application medium.
- the curtain 5 is held by curtain holders 6, which guide the free-falling curtain 5 at the curtain edge ends 7, and clamped.
- Fig. 1 and Fig. 2 each show a curtain edge end 7.
- the said to this curtain edge end 7 applies mutatis mutandis to the opposite other curtain edge end.
- the direction of movement of the moving paper or board web 2 is in Fig. 1 indicated by the direction of the arrow 8.
- the direction of movement of the moving paper or board web 2 can also lie in the opposite direction.
- the curtain applicator further comprises a separating device 9 for splitting the curtain 5 into a curtain central part 10 dropping onto a coating side of the paper or board web 2 in free fall and at least one free-falling curtain edge 11.
- the separating device 9 has a free jet 12 of a separating liquid covering the plane pierces the curtain 5 in a puncture region 13 and thereby separates the free-falling curtain edge 11 and derived.
- the free jet 12 is arranged with a beam path which encloses an acute first angle ⁇ with the plane of the curtain (cf. Fig. 1 ) and piercing region 13 penetrates with respect to the paper or board web 2 outwardly directed beam edge 14.
- the angle ⁇ is preferably in the range between 10 ° and 70 °.
- the free jet is preferably arranged with a beam path which encloses an acute second angle ⁇ with a plane of the paper or board web 2 in the coating zone 4 and punctures the push-through region 13 with a beam flank 14 directed outwards relative to the paper or board web 2 ,
- the angle ⁇ is preferably between 5 ° and 60 °. According to one not shown embodiment, the angle ⁇ but also be 0 °, ie the free jet 12 is then, for example, in a plane parallel to the plane of the paper or board web. 2
- a starting point of the free jet 12 determined by a nozzle 15 supplying the separating liquid is arranged at a distance of 5 to 500 mm from the curtain 5.
- a particularly preferred distance of the nozzle 15 to the curtain 5 is for example 40 to 50 mm.
- the arrangement of the nozzle 15 is preferably carried out in the immediate vicinity of the paper or board web 2 or the pad 3.
- the arrangement of the nozzle 15 can also be arranged much higher than, for example, 5 mm above the paper or board web 2 or the pad 3. Clearances to the paper or board web 2 from 15 to 20 mm are possible.
- the free jet 12 is preferably subjected to a pressure between 0.5 and 100 bar.
- the free jet 12 can be generated via a nozzle opening of 0.3 to 2.0 mm.
- the free jet 12 is preferably cylindrical.
- the free jet 12 is preferably oriented so that the piercing region 13 lies in the plane of the curtain 5 in a lower portion of the curtain detached from the curtain holders 6.
- Fig. 2 shows the separation edge 16. With the elimination of the side guide of the curtain edge ends 7 at the separation edge 16 begins a lateral contraction of the falling curtain 5 due to the surface tension.
- the width of the curtain 5 may be selected smaller or larger than the width of the paper or board web 2.
- An inboard driving style as well as an overboard driving style can therefore be embodied according to the invention.
- the width of the curtain 5 is greater than the width of the paper or board web 2.
- the curtain 5 is therefore preferably formed in an overboard driving manner as a free-falling curtain 5.
- a positioning of the puncture area 13 in the plane of the curtain 5 below the peel edge 16 of the curtain holder 6 and laterally spaced edge edge 19 of the paper or board web 2 can by a meniscus-like curvature of separation surfaces 20 to form a curtain center part 10 and at least one curtain edge 11 a uniform layer 1 can be adjusted to lateral edges of the paper or board web 2.
- a free-falling curtain 5 composed of one or more layers of casting solutions may be formed and applied to a paper or board web 2 in an on-line or off-line process for treating the paper or board web 2.
- a method for applying at least one layer 1 of a liquid or pasty application medium in the form of a substantially gravitationally moving curtain 5 onto a moving paper or board web 2 using a curtain applicator preferably comprises the following steps: producing a free-falling curtain 5 from at least one layer 1 the application medium, which is held clamped during the free fall and forms a coating zone 4, by which the paper or board web 2 is moved on a base 3; Splitting the curtain 5 in a free-falling curtain center part 10 and at least one free-falling curtain edge 11 by a free jet 12 formed from a separating liquid, which pierces the plane of the curtain 5 in a puncture region 13 and thereby the free-falling curtain edge 11 separates and diverts; Coating the paper or board web 2 through the curtain center part 10, wherein the free jet 12 has a beam path which forms an acute first angle ⁇ with the plane of the curtain 5 and which is oriented so that the piercing in the puncture region 13 with respect to the Paper or board web 2 outwardly directed beam
- the angle ⁇ can be selected in the range between 10 ° and 70 °.
- the free jet 12 may have a beam path which includes an acute second angle ⁇ with a plane of the paper or board web 2 in the coating zone 4 and which may be oriented such that the piercing in the piercing region 13 with respect to the paper or board web 2 outward beam edge 14 takes place.
- the angle ⁇ can be chosen between 5 ° and 60 °.
- a starting point of the free jet 12 determined by a nozzle 15 supplying the separating liquid may be arranged at a distance of 5 to 500 mm from the curtain 5.
- the free jet 12 can be acted upon with a pressure between 0.5 and 100 bar.
- the free jet 12 can be generated via a nozzle opening of 0.3 to 2.0 mm.
- a coating medium one with a viscosity of 50 mPa ⁇ s to 2 Pa ⁇ s can be selected.
- the width of the curtain 5 can be set smaller or larger than the width of the paper or board web 2.
- the free jet 12 can be oriented such that the push-through area 13 lie in the plane of the curtain 5 in a lower portion of the curtain 5 detached from the curtain holders 6.
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
- Coating Apparatus (AREA)
- Paper (AREA)
Abstract
Vorhangauftragsverfahren mit den folgenden Schritten: Erzeugen eines freifallenden flüssigen Vorhangs (5) aus mindestens einer Schicht (1) des Auftragsmediums, der während des freien Falls aufgespannt gehalten wird und eine Beschichtungszone bildet, durch die eine Papier- oder Kartonbahn (2) auf einer Unterlage bewegt wird, Spalten des Vorhangs (5) in ein freifallendes Vorhangmittelteil (10) und mindestens einen freifallenden Vorhangrand (11) durch einen aus einer Trennflüssigkeit gebildeten Freistrahl (12), der die Ebene des Vorhangs (5) in einem Durchstoßbereich (13) durchstößt und dadurch den freifallenden Vorhangrand (11) abtrennt und ableitet Beschichten der Papier- oder Kartonbahn (2) durch das Vorhangmittelteil (10), wobei der Freistrahl (12) einen Strahlverlauf besitzt, der einen spitzen ersten Winkel (²) mit der Ebene des Vorhangs (5) einschließt und der so orientiert wird, dass das Durchstoßen im Durchstoßbereich (13) mit einer bezogen auf die Papier- oder Kartonbahn (2) auswärtsgerichteten Strahlflanke (14) erfolgt.Curtain application method with the following steps: Producing a free-falling liquid curtain (5) from at least one layer (1) of the application medium, which is held tensioned during the free fall and forms a coating zone through which a paper or board web (2) is moved on a support, Splitting the curtain (5) into a free-falling curtain middle part (10) and at least one free-falling curtain edge (11) through a free jet (12) formed from a separating liquid, which pierces the plane of the curtain (5) in a puncture area (13) and thereby the free falling curtain edge (11) separates and dissipates Coating the paper or board web (2) through the curtain center part (10), wherein the free jet (12) has a beam path which forms an acute first angle (²) with the plane of the curtain (5) and is oriented such that the piercing in the puncture area (13) with a relative to the paper or board web (2) outwardly directed beam edge (14) takes place.
Description
Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Vorhangbeschichtung nach dem Oberbegriff des Anspruchs 1 und Anspruchs 11.The invention relates to a method and a device for curtain coating according to the preamble of
Bei der Beschichtung einer Papier- oder Kartonbahn mit einem Vorhangauftragswerk soll die Streichmasse möglichst gleichmäßig über die gesamte Bahnbreite aufgetragen werden, um die Vorteile eines kontaktlosen Auftragens gut nutzen zu können. Die Auftragsdicke muss dazu möglichst konstant über die gesamte Bahnoberfläche sein. Die Grundvoraussetzung dafür ist eine gleichmäßige Verteilung der Streichmasse über die Auslaufbreite hinsichtlich des Volumenstroms und der Geschwindigkeit.When coating a paper or board web with a curtain applicator, the coating should be applied as evenly as possible over the entire web width in order to make good use of the advantages of contactless application. The application thickness must be as constant as possible over the entire web surface. The basic prerequisite for this is a uniform distribution of the coating over the outlet width with regard to the volume flow and the speed.
Zur Bildung eines Vorhangs kann das Vorhangauftragswerk (Curtain Coater) mit einer Schlitzdüse oder einer Kaskadendüse verwendet werden. Bei einer Schlitzdüse (Slot-Fed Die) eines einschichtigen Vorhangauftragswerks bildet sich der Vorhang unmittelbar am Austritt aus dem Düsenspalt. Die Vorhangauftragswerke mit einer Schlitzdüse sind beispielsweise aus
Der Vorhang wird im freien Fall infolge der Schwerkraft beschleunigt. Mit dem zunehmenden Abstand von der Austrittskante der Düse wird der Vorhang durch die Wirkung der Schwerkraft und der Oberflächenspannung von den Rändern zur Mitte gezogen. Die Breite des Vorhangs wird dadurch schmaler. Um das Zusammenziehen des Vorhangs zu verhindern, wird der Vorhang mit Hilfe von Randführungselementen an den Rändern geführt.The curtain is accelerated in free fall due to gravity. As the distance from the exit edge of the nozzle increases, the curtain is drawn from the edges to the center by the action of gravity and surface tension. The width of the curtain is thereby narrower. In order to prevent the curtain from contracting, the curtain is guided by means of edge guiding elements at the edges.
Die Breite des Vorhangs kann bei einer so genannten Overboard-Fahrweise größer sein als die Bahnbreite. Beispielhaft genannt seien hier Werte von etwa 100 bis 200 mm. Bei der Overboard-Fahrweise genügt im Allgemeinen eine einfache Ausführung der Randführungselemente, um eine hohe Gleichmäßigkeit der Verteilung der Streichmasse im Randbereich zu gewährleisten. Nachteilig ist allerdings die Anhaftung von Streichmasse an der Unterseite der Papier- oder Kartonbahn, wodurch unerwünschte Verschmutzungen im Bereich der Beschichtungszone auftreten.The width of the curtain can be greater than the web width in a so-called overboard mode. By way of example, values of about 100 to 200 mm may be mentioned here. In the case of the overboard mode of operation, a simple embodiment of the edge guide elements is generally sufficient in order to ensure a high uniformity of the distribution of the coating compound in the edge region. However, a disadvantage is the adhesion of coating material to the underside of the paper or board web, as a result of which undesired contamination in the area of the coating zone occurs.
Bei einer Inboard-Fahrweise ist die Breite des Vorhangs kleiner oder gleich der Bahnbreite. In diesem Falle muss die Streichfarbe im Randbereich sowie in der Mitte sehr gleichmäßig über die Bahnbreite verteilt werden. Dabei ist wichtig, dass der Vorhang in der ganzen Auftreffzone mit der gleichen Geschwindigkeit auf die bewegte Papier- oder Kartonbahn auftrifft. Andernfalls würden sich Probleme mit der Beschichtung der Papier- oder Kartonbahn in Form von Randwulsten und nicht getrockneten Rändern ergeben. Um dies zu vermeiden, sind Randführungselemente für die Inboard-Fahrweise beispielsweise beschrieben in
Um eine Gleichmäßigkeit der Verteilung der Streichmasse im Randbereich für die Inboard-Fahrweise zu erreichen ist ferner bekannt, die Reibungskräfte zu reduzieren, wie beispielsweise beschrieben in
Ferner bekannt ist die Verwendung von Trennelementen, die auf den freifallenden Vorhang einwirken. Aus
Aus
Aus
Aus
Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung zur Vorhangbeschichtung mit einem Vorhangteiler für den Randbereich eines Vorhangauftragswerks zu schaffen, die eine hohe Gleichmäßigkeit der Verteilung der Streichmasse im Randbereich erlauben.The invention is therefore based on the object to provide a method and apparatus for curtain coating with a curtain divider for the edge region of a curtain applicator, which allow a high uniformity of the distribution of the coating in the edge region.
Diese Aufgabe wird gelöst durch die Merkmale des Anspruchs 1 und des Anspruchs 11.This object is achieved by the features of
Hierdurch wird ein Verfahren und eine Vorrichtung zum Vorhangbeschichten einer bewegten Papier- oder Kartonbahn geschaffen, bei denen der freifallende Vorhang in ein Vorhangmittelteil und mindestens einen Vorhangrand getrennt wird unter Verwendung einer Trennvorrichtung, die einen Freistrahl aus Trennflüssigkeit aufweist. Dadurch dass der Freistrahl mit einem Winkel zum Vorhang angeordnet ist, wird der Vorhang mit einer Strahlflanke geschnitten. Durch diese schräge Anordnung des Freistrahls wird der Vorhang an der Schnittstelle an einer Innenseite gestreckt und auf einer Außenseite verdichtet, wobei Innenseite und Außenseite bezogen sind auf das Vorhangmittelteil. Die Streichmasse wird dadurch auf der Innenseite auf einer größeren Fläche verteilt. Die Schichtdicke kann folglich im Randbereich reduziert und eine Wulstbildung im Randbereich auf der Papier- oder Kartonbahn minimiert werden. Dies gilt in gleicher Weise für Streichmassen mit niedrigerer oder höherer Viskosität, die deshalb gleichmäßiger aufgetragen werden können. Funktionsstriche wählbarer Art können so mit geringer Strichmenge verbessert aufgetragen werden, woraus auch ein Kostenvorteil resultiert.This provides a method and apparatus for curtain coating a moving paper or board web in which the free falling curtain is separated into a curtain center portion and at least one curtain edge using a separator having a free jet of release liquid. The fact that the free jet is arranged at an angle to the curtain, the curtain is cut with a beam edge. By this oblique arrangement of the free jet, the curtain is stretched at the interface on an inner side and compressed on an outer side, wherein the inside and outside are related to the curtain middle part. The coating is thus distributed on the inside over a larger area. The layer thickness can consequently be reduced in the edge region and bead formation in the edge region on the paper or board web can be minimized. This applies equally to coatings of lower or higher viscosity, which can therefore be applied more uniformly. Function bars of selectable type can thus be applied improved with a small amount of coating, which also results in a cost advantage.
In Bewegungsrichtung der Papier- oder Kartonbahn gesehen, durchtrennt der Freistrahl den Vorhang vorzugsweise von hinten. An der Schnittstelle hinter dem Vorhang bildet sich dann eine meniskusartige Wölbung mit den vorgenannten Vorteilen.Seen in the direction of movement of the paper or board web, the free jet cuts the curtain preferably from behind. At the interface behind the curtain then forms a meniscus-like curvature with the aforementioned advantages.
Eine Abgabevorrichtung zum Bilden eines Vorhangs, der im freien Fall auf eine Beschichtungsseite der Papier- oder Kartonbahn fällt, kann einen Vorhang bilden, der eine Breite besitzt, die kleiner oder größer als die Breite der bewegten Papier- oder Kartonbahn und/oder deren Unterlage ist. Der Erfindungsgegenstand ist bei Overboard-Fahrweise als auch bei Inboard-Fahrweise anwendbar. Bei der Overboard-Fahrweise kann erfindungsgemäß die Trennung des Vorhangs durch eine Wahl der räumlichen Lage des Durchstoßbereiches so vorgenommen werden, dass der mitgerissene Vorhangrand fortgeleitet und das Vorhangmittelteil nach Art der Inboard-Fahrweise die Papier- oder Kartonbahn beschichtet, und zwar ohne die Wulstbildung am Rand der Beschichtung, die durch das Vorhangmittelteil auf der Papier- oder Kartonbahn aufgetragen wird. Erfindungsgemäß kann die Overboard-Fahrweise in eine Inboard-Fahrweise überführt werden, wobei am Rand der Beschichtung durch das Vorhangmittelteil keine Wulst entsteht oder zumindest die Wulstbildung minimiert wird.A dispenser for forming a curtain falling on a coating side of the paper or board web in free fall may form a curtain having a width that is less than or greater than the width of the moving paper or board web and / or its backing , The subject invention is applicable to overboard driving as well as inboard driving. In the case of the overboard mode of operation, according to the invention, the separation of the curtain can be carried out by selecting the spatial position of the penetration area such that the entrained curtain edge forwarded and the curtain middle part in the manner of the inboard driving the paper or board web coated, without the beading on the edge of the coating, which is applied through the curtain middle part on the paper or board web. According to the invention, the overboard driving style can be converted into an in-board driving style, wherein at the edge of the coating by the curtain middle part no bead is formed or at least the bead formation is minimized.
Weitere Ausgestaltungen der Erfindung sind der nachfolgenden Beschreibung und den Unteransprüchen zu entnehmen.Further embodiments of the invention are described in the following description and the dependent claims.
Die Erfindung wird nachstehend anhand des in den beigefügten Abbildungen dargestellten Ausführungsbeispiels näher erläutert.
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Fig. 1 zeigt teilweise und schematisch eine Draufsicht eines Vorhangauftragswerks mit einem auf eine Papier- oder Kartonbahn freifallenden Vorhang und mit einer Trennvorrichtung in Form eines Freistrahls einer Trennflüssigkeit gemäß einem ersten Ausführungsbeispiel, -
Fig. 2 zeigt teilweise und schematisch eine Vorderansicht des Vorhangauftragswerks mit dem auf die Papier- oder Kartonbahn freifallenden Vorhang und mit der Trennvorrichtung in Form eines Freistrahls einer Trennflüssigkeit gemäß dem ersten Ausführungsbeispiel.
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Fig. 1 shows, partially and schematically, a plan view of a curtain applicator with a curtain free-falling onto a paper or board web and with a separating device in the form of a free jet of a separating liquid according to a first embodiment, -
Fig. 2 shows partially and schematically a front view of the curtain applicator with the free-falling onto the paper or board web curtain and with the separator in the form of a free jet of a separating liquid according to the first embodiment.
Wie
Das Vorhangauftragswerk umfasst eine Transportvorrichtung zum Bewegen einer Unterlage 3 für die Papier- oder Kartonbahn 2 durch eine Beschichtungszone 4. Die Unterlage 3 ist hier beispielsweise als eine Stützwalze ausgebildet. Das Vorhangauftragswerk umfasst ferner eine Abgabeeinrichtung (nicht dargestellt) zum Bilden eines freifallenden Vorhangs 5 aus Auftragsmedium. Der Vorhang 5 wird von Vorhanghaltern 6, die den freifallenden Vorhang 5 an Vorhangrandenden 7 führen, gehalten und aufgespannt.
Das Vorhangauftragswerk umfasst weiterhin eine Trennvorrichtung 9 zum Spalten des Vorhangs 5 in ein im freien Fall auf eine Beschichtungsseite der Papier- oder Kartonbahn 2 fallendes Vorhangmittelteil 10 und mindestens einen freifallenden Vorhangrand 11. Die Trennvorrichtung 9 weist einen Freistrahl 12 einer Trennflüssigkeit auf, der die Ebene des Vorhangs 5 in einem Durchstoßbereich 13 durchstößt und dadurch den freifallenden Vorhangrand 11 abtrennt und ableitet.The curtain applicator further comprises a separating device 9 for splitting the
Der Freistrahl 12 ist mit einem Strahlverlauf angeordnet, der einen spitzen ersten Winkel β mit der Ebene des Vorhangs einschließt (vgl.
Der Winkel β liegt vorzugsweise im Bereich zwischen 10° und 70°. Wie in
Ein von einer die Trennflüssigkeit zuführenden Düse 15 bestimmter Anfangspunkt des Freistrahls 12 ist mit einem Abstand von 5 bis 500 mm von dem Vorhang 5 angeordnet. Ein besonders bevorzugter Abstand der Düse 15 zum Vorhang 5 liegt beispielsweise bei 40 bis 50 mm.A starting point of the
Die Anordnung der Düse 15 erfolgt vorzugsweise in unmittelbarer Nähe zur Papier- oder Kartonbahn 2 oder der Unterlage 3. Die Anordnung der Düse 15 kann aber auch deutlich höher als beispielsweise 5 mm über der Papier- oder Kartonbahn 2 oder der Unterlage 3 angeordnet sein. Abstände zur Papier- oder Kartonbahn 2 von 15 bis 20 mm sind möglich.The arrangement of the
Der Freistrahl 12 ist vorzugsweise mit einem Druck zwischen 0,5 und 100 bar beaufschlagt. Dabei kann der Freistrahl 12 über eine Düsenöffnung von 0,3 bis 2,0 mm erzeugt werden. Der Freistrahl 12 ist vorzugsweise zylindrisch. Der Freistrahl 12 ist vorzugsweise derart orientiert angeordnet, dass der Durchstoßbereich 13 in der Ebene des Vorhangs 5 in einem unteren von den Vorhanghaltern 6 abgelösten Abschnitt des Vorhangs liegt.
Wird der Durchstoßbereich 13, wie insbesondere aus
Die Breite des Vorhangs 5 kann kleiner oder größer als die Breite der Papier- oder Kartonbahn 2 gewählt sein. Eine Inboard-Fahrweise als auch eine Overboard-Fahrweise sind deshalb erfindungsgemäß ausbildbar.The width of the
Gemäß dem dargestellten Ausführungsbeispiel ist die Breite des Vorhangs 5 größer als die Breite der Papier- oder Kartonbahn 2. Der Vorhang 5 wird folglich vorzugsweise in einer Overboard-Fahrweise als freifallender Vorhang 5 gebildet. Durch beispielsweise eine Positionierung des Durchstoßbereiches 13 in der Ebene des Vorhangs 5 unterhalb der Ablösekante 16 der Vorhanghalter 6 und seitlich beabstandet einer randseitigen Kante 19 der Papier- oder Kartonbahn 2 kann durch eine meniskusartige Wölbung von Trennungsflächen 20 zur Ausbildung eines Vorhangmittelteils 10 und mindestens eines Vorhangrandes 11 eine gleichmäßige Schicht 1 bis hin zu seitlichen Rändern der Papier- oder Kartonbahn 2 eingestellt werden.According to the illustrated embodiment, the width of the
Mit der beschriebenen Vorrichtung kann ein aus einer oder mehreren Schichten von Gießlösungen zusammengesetzter, freifallender Vorhang 5 ausgebildet und auf eine Papier- oder Kartonbahn 2 in einem on-line oder off-line Verfahren zum Behandeln der Papier- oder Kartonbahn 2 aufgetragen werden.With the described apparatus, a free-falling
Ein Verfahren zum Auftragen mindestens einer Schicht 1 eines flüssigen oder pastösen Auftragsmediums in Form eines sich im Wesentlichen schwerkraftbedingt bewegenden Vorhangs 5 auf eine bewegte Papier- oder Kartonbahn 2 unter Verwendung eines Vorhangauftragswerks umfasst vorzugsweise folgende Schritte: Erzeugen eines freifallenden Vorhangs 5 aus mindestens einer Schicht 1 des Auftragsmediums, der während des freien Falls aufgespannt gehalten wird und eine Beschichtungszone 4 bildet, durch die die Papier- oder Kartonbahn 2 auf einer Unterlage 3 bewegt wird; Spalten des Vorhangs 5 in ein freifallendes Vorhangmittelteil 10 und mindestens einen freifallenden Vorhangrand 11 durch einen aus einer Trennflüssigkeit gebildeten Freistrahl 12, der die Ebene des Vorhangs 5 in einem Durchstoßbereich 13 durchstößt und dadurch den freifallenden Vorhangrand 11 abtrennt und ableitet; Beschichten der Papier- oder Kartonbahn 2 durch das Vorhangmittelteil 10, wobei der Freistrahl 12 einen Strahlverlauf besitzt, der einen spitzen ersten Winkel β mit der Ebene des Vorhangs 5 einschließt und der so orientiert wird, dass das Durchstoßen im Durchstoßbereich 13 mit einer bezogen auf die Papier- oder Kartonbahn 2 auswärtsgerichteten Strahlflanke 14 erfolgt.A method for applying at least one
Der Winkel β kann im Bereich zwischen 10° und 70° gewählt werden. Der Freistrahl 12 kann einen Strahlverlauf besitzen, der einen spitzen zweiten Winkel α mit einer Ebene der Papier- oder Kartonbahn 2 in der Beschichtungszone 4 einschließt und der so orientiert werden kann, dass das Durchstoßen im Durchstoßbereich 13 mit einer bezogen auf die Papier- oder Kartonbahn 2 auswärtsgerichteten Strahlflanke 14 erfolgt. Der Winkel α kann zwischen 5° und 60° gewählt werden. Ein von einer die Trennflüssigkeit zuführenden Düse 15 bestimmter Anfangspunkt des Freistrahls 12 kann mit einem Abstand von 5 bis 500 mm von dem Vorhang 5 angeordnet werden.The angle β can be selected in the range between 10 ° and 70 °. The
Der Freistrahl 12 kann mit einem Druck zwischen 0,5 und 100 bar beaufschlagt werden. Der Freistrahl 12 kann über eine Düsenöffnung von 0,3 bis 2,0 mm erzeugt werden.The
Als Auftragsmedium kann ein solches mit einer Viskosität von 50 mPa·s bis 2 Pa·s gewählt werden.As a coating medium, one with a viscosity of 50 mPa · s to 2 Pa · s can be selected.
Die Breite des Vorhangs 5 kann kleiner oder größer als die Breite der Papier- oder Kartonbahn 2 eingestellt werden. Der Freistrahl 12 kann derart orientiert werden, dass der Durchstoßbereich 13 in der Ebene des Vorhangs 5 in einem unteren von den Vorhanghaltern 6 abgelösten Abschnitt des Vorhangs 5 liegen.The width of the
Claims (19)
Applications Claiming Priority (1)
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DE102014013996.4A DE102014013996A1 (en) | 2014-09-25 | 2014-09-25 | Method and apparatus for curtain coating |
Publications (2)
Publication Number | Publication Date |
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EP3006115A1 true EP3006115A1 (en) | 2016-04-13 |
EP3006115B1 EP3006115B1 (en) | 2017-07-26 |
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EP15002751.4A Active EP3006115B1 (en) | 2014-09-25 | 2015-09-23 | Method and device for curtain coating |
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DE (1) | DE102014013996A1 (en) |
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EP0737521A2 (en) | 1995-04-10 | 1996-10-16 | Du Pont De Nemours (Deutschland) Gmbh | Method and device for reducing disturbances in curtain-coating |
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EP1003934A2 (en) | 1997-08-15 | 2000-05-31 | Jagenberg Papiertechnik GmbH | Method and device for applying a pigment coating to a strip of paper or cardboard |
WO2001054828A1 (en) | 2000-01-26 | 2001-08-02 | Tetra Laval Holdings & Finance S A | Method of manufacturing a multi-layer packaging laminate and packaging laminate obtained by the method |
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EP1458493A1 (en) | 2001-12-13 | 2004-09-22 | Dow Global Technologies Inc. | Method and apparatus for curtain coating |
WO2005024133A1 (en) | 2003-09-10 | 2005-03-17 | Metso Paper, Inc. | Arrangement in a nozzle beam for a fibrous web coating apparatus |
DE102005017547A1 (en) | 2005-04-16 | 2006-10-19 | Voith Patent Gmbh | Application process |
DE102005036667A1 (en) * | 2005-08-04 | 2007-02-08 | Voith Patent Gmbh | Application process |
EP2067531A2 (en) | 2007-12-05 | 2009-06-10 | Voith Patent GmbH | Edge guide |
-
2014
- 2014-09-25 DE DE102014013996.4A patent/DE102014013996A1/en not_active Withdrawn
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2015
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EP0180289A1 (en) | 1984-10-05 | 1986-05-07 | Westinghouse Electric Corporation | High temperature solid electrolyte electrochemical cells |
EP0737521A2 (en) | 1995-04-10 | 1996-10-16 | Du Pont De Nemours (Deutschland) Gmbh | Method and device for reducing disturbances in curtain-coating |
EP0740197A1 (en) | 1995-04-26 | 1996-10-30 | Ilford Ag | Process and apparatus for curtain-coating a moving substrate |
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DE19716647A1 (en) | 1997-04-21 | 1998-10-22 | Jagenberg Papiertech Gmbh | Method and device for applying a pigment coating ink to a paper or cardboard web |
EP1003934A2 (en) | 1997-08-15 | 2000-05-31 | Jagenberg Papiertechnik GmbH | Method and device for applying a pigment coating to a strip of paper or cardboard |
EP0907103A1 (en) | 1997-10-03 | 1999-04-07 | Troller Schweizer Engineering AG | Process and apparatus for curtain coating a moving substrate |
EP0943961A2 (en) | 1998-03-18 | 1999-09-22 | Eastman Kodak Company | Curtain coating apparatus and method with continuous width adjustment |
WO2001054828A1 (en) | 2000-01-26 | 2001-08-02 | Tetra Laval Holdings & Finance S A | Method of manufacturing a multi-layer packaging laminate and packaging laminate obtained by the method |
WO2002081103A1 (en) | 2001-04-09 | 2002-10-17 | Bachofen + Meier Ag Maschinenfabrik | Device for coating a moving material web |
EP1458493A1 (en) | 2001-12-13 | 2004-09-22 | Dow Global Technologies Inc. | Method and apparatus for curtain coating |
WO2005024133A1 (en) | 2003-09-10 | 2005-03-17 | Metso Paper, Inc. | Arrangement in a nozzle beam for a fibrous web coating apparatus |
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Also Published As
Publication number | Publication date |
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DE102014013996A1 (en) | 2016-03-31 |
EP3006115B1 (en) | 2017-07-26 |
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