EP2379231A1 - Encolleuse à rideau - Google Patents

Encolleuse à rideau

Info

Publication number
EP2379231A1
EP2379231A1 EP09795741A EP09795741A EP2379231A1 EP 2379231 A1 EP2379231 A1 EP 2379231A1 EP 09795741 A EP09795741 A EP 09795741A EP 09795741 A EP09795741 A EP 09795741A EP 2379231 A1 EP2379231 A1 EP 2379231A1
Authority
EP
European Patent Office
Prior art keywords
curtain
fibrous web
holder
width
drip pan
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Withdrawn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
EP09795741A
Other languages
German (de)
English (en)
Inventor
Bernd-Uwe Stellner
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 EP2379231A1 publication Critical patent/EP2379231A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • 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

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 Fibrous web arranged and at least the width of the fibrous web corresponding curtain application head, the side curtain holder are assigned to the one or more layers curtain over his fall path away, ie between a tear-off edge of the applicator head and the surface of the fibrous web at its two lateral edges and wherein the curtain applicator head and a collecting device, in particular collecting trough is associated with side walls, which is able to substantially absorb the already or still falling curtain.
  • the invention also relates to a process for curtain coating.
  • a generic device and a method are known for example from DE-A1 102 32 949. It was proposed that the application medium curtain be guided at its lateral edges for a curtain application process and a corresponding curtain application unit by means of curtain holders and by means of an operating medium.
  • curtain applicators With several known curtain applicators several application media or multiple layers of a job medium can be issued.
  • One embodiment of a curtain applicator is known inter alia from EP-A1 - 1 255 615 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 supply 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.
  • a trailing edge or as a detachment line to be designated edge of the nozzle dissolves it superimposed multilayer 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 curtain width and thus the coating width can be equal to or less than the width of the fibrous web, which is referred to as "inboard" -Fahrweise.
  • the curtain width is greater than the width of the fibrous web.
  • curtain holders To guide the monolayer or multilayer dispensed curtain curtain holder, as disclosed by way of example in the first-mentioned document, necessary. These curtain holders bring the curtain close to the fibrous web. Any free distance from the web causes the curtain to constrict with resulting thickening in the periphery. This then results on the surface of the fibrous web edge beads, which are of course undesirable because they lead in the initial phase of the coating process to uneven application layer and also to fouling leading the fibrous web vanes.
  • At least one partial area of the drip pan is located between the two curtain holders when catching the curtain (a curtain holder is located at each edge of the curtain, both curtain holders forming a mutually facing, parallel pair).
  • the arrangement is made such that substantially reaches the portion of the drip pan to the insides of the two opposite curtain holder.
  • the drip pan is not located between the curtain holders. Outside the coating process, the drip tray is only partially, so only with a portion - at least temporarily - between the curtain holders. The drip tray can be moved in the longitudinal direction.
  • this longitudinal or movement direction of the drip pan can be parallel to the web running direction or at a certain angle to the longitudinal direction (machine direction) through the Faserstoffbahnher einsungs- or finishing machine moving fibrous web. Also combined pivoting and lifting movements of the sump are possible. In any case, the direction of movement is perpendicular to the transverse direction of the coating machine.
  • the catching of the curtain can, as already mentioned, be particularly effective if the side walls with the wing-like formations touch or touch the insides of the lateral curtain holders.
  • the curtain holders will not be damaged. This can be conveniently achieved by the wing-like formations are flexible, especially designed to fold outward. As a material for the wing-like side walls is especially plastic.
  • Said portion with the wing-like formations may be formed integrally with the actual sump.
  • a separately manufactured partial area which is simply placed on the edge areas of the collecting trough and can thus be moved independently of the actual collection trough movement, can be used more variably.
  • the separate sections are interchangeable. With them, coating widths can be further varied and also compensate for manufacturing deviations.
  • the insides of the curtain holder have a longitudinally extending, horizontal groove.
  • the wing-like side walls of the sub-area can conform to the curtain holder or lie with a low bias voltage.
  • gap-free or seamless transitions between drip pan and curtain holder are achieved and it is a ensures clean catching of the curtain.
  • the drip pan can catch as a result of their design according to the invention, the majority of the curtain, whereas a remaining small residue runs from the curtain holders and is discharged from there. This media removal can be drained, making the process more effective.
  • the drip pan or the partial area of the drip pan also has a separate media outlet in the area of the curtain holders.
  • the collected expensive application medium can be recirculated and returned to a paint chest.
  • the curtain holders can be held on the application head. Alternately, separate holding devices are conceivable.
  • the object of the invention is achieved according to claim 15 with a method for coating a running paper, cardboard or other fibrous web.
  • the curtain application head and the curtain holder remain in their position and only the drip pan, i. at least a portion of the longitudinally movable drip tray between the two curtain holder is driven.
  • the drip tray captures the vast majority of the curtain, whereas the remaining residue is collected by the curtain holders and removed from here.
  • auxiliary fluid water can preferably be used.
  • the invention can be used equally well both in a single-layer, as well as multi-layered trained curtain.
  • the drip pan according to the invention or the subregions or inserts according to the invention can be very easily retrofitted into existing curtain coating systems.
  • FIG. 1 shows a curtain applicator according to the invention in a schematic perspective representation
  • FIG. 2 shows a front view of an area X from FIG. 1,
  • Figure 3 a second embodiment of the area X.
  • Figure 4 a third embodiment of the area X.
  • Figure 5 a fourth embodiment of the area X.
  • Figure 6 a fifth embodiment of the area X.
  • FIG. 1 shows a curtain applicator 1 for coating a running paper, board or other fibrous web 2 with a liquid to pasty application medium M. It comprises, in addition to some not shown here units, such as air boundary layer control devices, measuring equipment, feed lines, etc. above the fibrous web 2 and spaced therefrom arranged and only slightly hinted curtain application head 3.
  • This application head 3 may be formed as a so-called Gleit Anlagendüse or slot be and is machine-wide executed.
  • the application head 3 can be configured both for a multi-layer application and for a single-layer application and deliver a single-layer or multi-layer curtain 4.
  • the curtain 4 drops from the tear-off edge 5 of the applicator head substantially following the force of gravity, down onto the fibrous web 2 and deposits on its surface as a coating layer.
  • curtain applicator 1 side curtain holder 6 on the driver side FS and drive side TS on.
  • curtain holders 6 serve to guide and limit the size of the single-layer or multi-layered curtain 4 between the tear-off edge 6 and the surface of the fibrous web 2 at its lateral edges 4a and 4b.
  • the curtain holder 6 are adjustable in the width direction of the curtain 4. In the selected examples, the curtain holders 6 are within the width of the fibrous web 2.
  • the curtain application head 3 is also associated with a collecting device, in particular a collecting trough 7, which essentially collects the curtain 4 which is already falling or still falling during the start and stop phase of the coating process.
  • the side walls 7a, 7b have wing-like projections 9 in the area of the tee piece 8 of the collecting trough 7, which are directed outwards and thereby contact the inner sides 6a. Conveniently, they are flexible or simply folded outwards. So that the inner walls 6a of the curtain holder 6 are not damaged, the wings 9 are preferably made of plastic.
  • FIG. 2 A front view of an area X of Figure 1 is shown in Figure 2, showing the one (left) side of the commissioned work 1 with the lower portion of the curtain holder 6 and the associated side of the sump 7. It can be seen that the curtain 4 substantially is collected over its entire width of the drip pan 7 when starting and stopping the coating process.
  • a medium discharge 10 is integrated, with the still remaining 4 c of the curtain 4 is discharged. This discharge is marked with a horizontal arrow and can be made more effective by suction.
  • FIG. 3 shows that the partial region 8 is manufactured as a separate component and is therefore designated 8 '.
  • This portion 8 ' is placed on the drip pan 7 and its side wall 7a and 7b (the right side wall 7b is not shown here) and adjustable. This adjustability is indicated by a horizontal arrow.
  • the portion 8 ' is parallel to the associated curtain holder 6 in the width direction of the sump 7 adjustable.
  • the position shifted here of the curtain holder 6 and the sub-area 8 ' is shown with dashed lines and with a horizontal arrow in the figure.
  • FIG. 4 shows, in a perspective view as an alternative solution to FIG. 3, that the separate subarea 8 'is connected to the associated curtain holder 6 via a guide 11 and can be displaced together with the curtain holder 6 in the width direction, manually or by motor.
  • FIG. 5 shows that the inside 6a of the curtain holder 6 has a longitudinally extending groove 12.
  • the portion 8 or the sump 7 and the wing 9 is inserted at its edge or at its edge 8a.
  • Shown in this figure 5 is a continuous drip tray 7.
  • the separate portion 8 'could sit in the groove 12.
  • FIG. 6 shows that the separate subarea 8 'of the drip pan 7 may have a separate media outlet 10 in the area of the curtain holder 6. These media removal 10 is also available.
  • the curtain application head 3 and the curtain holder 6 remain in their position. Only the drip pan 7, ie at least the sub-area 8 or the separate part 8 'of the drip pan 7 which can be moved in the longitudinal direction L, is moved between the two curtain holders 6. in the Example is set a curtain width which is smaller than the width of the fibrous web 2. An adjustment and / or tilting of the entire application head is not necessary. In addition, reliably unwanted edge beads can be avoided on application medium on the fibrous web.

Landscapes

  • Coating Apparatus (AREA)
  • Paper (AREA)

Abstract

L'invention concerne une encolleuse à rideau (1) servant au revêtement d'une bande continue de papier, carton ou autre matière fibreuse (2), en déplacement, comprenant : au moins un milieu d'application (M) liquide à pâteux, sous forme d'un rideau monocouche ou multicouche (4), lequel tombe sensiblement, par gravité, sur la bande continue de matière fibreuse (2), une tête d'encolleuse à rideau (3), disposée au-dessus de la bande continue de matière fibreuse (2), et correspondant au moins à la largeur de ladite bande de matière fibreuse (2), tête à laquelle sont associés des supports latéraux de rideau (6) qui guident le rideau monocouche ou multicouche (4) sur ses deux bords latéraux (4a, 4b), sur son parcours de retombée, c'est-à-dire entre un bord d'arrachement (5) de la tête d'encolleuse (3) et la surface de la bande continue de matière fibreuse. A la tête d'encolleuse à rideau (3) est associé un dispositif récepteur, en particulier un carter récepteur (7) qui est en mesure de recueillir sensiblement le rideau (4) déjà tombé ou encore en retombée. L'invention est caractérisée en ce que, lors de la réception du rideau (4), au moins une zone partielle (8, 8') du carter récepteur (7) se trouve entre les deux supports de rideau (6), et en ce que la zone partielle (8, 8') atteint sensiblement, par ses parois latérales (7a, 7b), les parties intérieures (6a) des supports de rideau (6). L'invention concerne également un procédé.
EP09795741A 2008-12-18 2009-12-10 Encolleuse à rideau Withdrawn EP2379231A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200810054912 DE102008054912A1 (de) 2008-12-18 2008-12-18 Vorhang-Auftragswerk
PCT/EP2009/066815 WO2010069852A1 (fr) 2008-12-18 2009-12-10 Encolleuse à rideau

Publications (1)

Publication Number Publication Date
EP2379231A1 true EP2379231A1 (fr) 2011-10-26

Family

ID=41665070

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09795741A Withdrawn EP2379231A1 (fr) 2008-12-18 2009-12-10 Encolleuse à rideau

Country Status (3)

Country Link
EP (1) EP2379231A1 (fr)
DE (1) DE102008054912A1 (fr)
WO (1) WO2010069852A1 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3867901A (en) * 1968-06-03 1975-02-25 Eastman Kodak Co Apparatus for production of photographic elements
SE515824C2 (sv) 2000-01-26 2001-10-15 Tetra Laval Holdings & Finance Förfarande för tillverkning av ett flerskiktat förpackningslaminat genom våtbeläggning, samt laminat tillverkat enligt förfarandet
DE10012344A1 (de) 2000-03-14 2001-09-20 Voith Paper Patent Gmbh Vorhang-Auftragsverfahren
US6610148B2 (en) * 2001-11-26 2003-08-26 Eastman Kodak Company Curtain coating startup apparatus
DE10232949A1 (de) 2002-07-19 2004-01-29 Voith Paper Patent Gmbh Vorhang-Auftragsvorrichtung
DE10359117A1 (de) 2003-12-17 2005-07-28 Voith Paper Patent Gmbh Vorhangauftragswerk

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2010069852A1 *

Also Published As

Publication number Publication date
WO2010069852A1 (fr) 2010-06-24
DE102008054912A1 (de) 2010-06-24

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