DE102009000809A1 - Curtain applicator - Google Patents

Abstract

The invention relates to a curtain coater (1.1, 1.2, 1.3) for coating a running paper, board or other fibrous web (2) in a coating machine, comprising one above the fibrous web (2) arranged and at least the width of the fibrous web (2 ) corresponding curtain application head (3) for dispensing at least one liquid to pasty application medium (M1, M2) in the form of a single or multi-layered curtain (7), which essentially following the gravity falling on the fibrous web (2), wherein for guiding of the curtain (7) across its fallway, d. H. between a tear-off edge (8) of the applicator head (3) and the surface of the below the applicator head (3) in the longitudinal direction (MD) moving fibrous web (2) on at least one side edge of the curtain (7) a curtain holder (6) is provided, also comprising an application medium gutter and an air boundary layer removal device. According to the invention, it is provided that the curtain holder (6) is movably arranged on a component of the coating machine or the forehand applicator (1.1, 1.2, 1.3), so that the curtain holder (6) during operation of the commissioned work (1.1, 1.2, 1.3 ) is held in its operating position (I), but still allows him to leave his operating position (I).

Description

The The invention relates to a curtain applicator for coating a running paper, board or other fibrous web, comprising one arranged above the fibrous web and at least the Width of the fibrous web corresponding curtain application head to Delivery of at least one liquid to pasty Application medium in the form of a single or multilayer curtain, essentially following gravity on the fibrous web falls down, leading to the curtain over his fall path away, d. H. between a spoiler edge of the gun and the surface of itself below the gun longitudinally moving fibrous web on at least one Side edge of the curtain is provided a curtain holder, as well comprising an application medium gutter and an air boundary layer removal device.

A generic curtain commissioned work is from the DE-A1 102 32 949 known. It was proposed that the curtain delivered by the curtain applicator be stabilized or guided by means of curtain holders.

With the known curtain applicators both a single coating layer and at the same time several layers are deliverable. An embodiment of a curtain-commissioned work, which also curtain holder (here referred to as edge strip) has inter alia in the post-published DE 10 2008 040 409 described and illustrated. This embodiment according to the 1 is referred to in professional circles as "Slide Die", ie Gleitschichtdüse. 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. At a trailing edge or as a detachment line to be designated edge of the nozzle, 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 edge strips are adjustable in the width direction of the curtain, ie in the transverse direction of the commissioned work. However, other embodiments of applicator heads are known in which a slot die for producing a single-layer application or multiple slot dies for delivering a multiple layer down toward the underlying fibrous web. In this case, the tear-off edge is formed by one of the slot die lips or, in a variant, by the end of a sliding face arranged between dispensing nozzle and counter surface or fibrous web. For this purpose, the already mentioned DE ... 409 referred where in the local 3 a single-layer order is shown and described. In addition, on the post-published DE 10 2007 000 778 referenced in which a curtain multilayer order is disclosed. Also in the latter invention, curtain holders are provided which are movable in the machine direction (longitudinal direction).

At the Brush - both single-layered and multi-layered Order - with the Curtain Coater (Curtain Coater) The coating width can be equal to or less than the width be the fibrous web, what as "inboard" -Fahrweise referred to as.

at so-called "overboard" driving is against it the curtain width is greater than the fibrous web width.

In front especially in the inboard driving style are curtain holder, as with the first-mentioned document are disclosed necessary. These Curtain holders guide the curtain, which is approx. 200 mm long, close to the fibrous web.

The Curtain holders known from the prior art are usually in pairs arranged. Here are a curtain holder on the so-called Guide page and a curtain holder on the so-called drive side the coating machine. These curtain holders are each firm and rigid on a component of the coating machine or a component, such as the application head, Collecting gutters or air boundary layer removal device of the curtain applicator arranged. Although this arrangement is stable, but has the disadvantage that this Assemblies can only ever be completely moved, which very expensive. Moving the curtain holder is for example necessary when drawing in a new fibrous web.

often Inadvertently contacting the curtain holder, so that this or another component of the relevant module is damaged can be. For example, in a sudden Demolition of the railway the railway leading or supporting "Wrap up" rolls so that the curtain holders, no matter in which position they are, disturb or be affected. This is also true for cleaning or maintenance work possible. This can, for example a cleaning or maintenance device to the curtain holder bump and thereby the curtain holder or the device damage yourself.

It is therefore an object of the invention to provide a curtain applicator, which the Nachtei le of the prior art no longer has.

The The object of the invention is with a curtain-commissioned work with the characterizing features of claim 1 solved.

According to the invention provided that the curtain holder movable on a component of the coating machine or the curtain applicator is arranged. This flexibility guarantees that the at least one curtain holder (preferably Each is a curtain holder on the driver's and on the drive side the coater) during the operation of the Commissioned in his position, but still possible is to leave and / or resume its operating position.

by virtue of This flexibility of the curtain holder, there is a very good protection the curtain holder at external forces caused movements. So these forces can unplanned, so occur purely by chance. As an example, be a web break or a so-called Packing the web guiding or supporting rollers called. The layer of layers forming here can be arranged to be movable, for example movingly suspended curtain holder defined push away. In the prior art would be the curtain holder or its Attachment or the modules connected to it are damaged.

A Random movement of the curtain holder may also occur during service or during cleaning of the commissioned work. Here you can unintentional contact z. B. with a cleaning device the Curtain holder also deflect without this or the device is damaged. Added to that, people who are directly stop at the coater or curtain applicator, Protected against pinching between curtain holder and the track or curtain holder and roller, because as I said, a fast and safe deflection or movement of the curtain holder possible is.

Of the Curtain holder is also intentionally movable. That is in particular then the case when a new web is to be fed into the machine or a splice passage is expected. Here it is more advantageous if the curtain holder (s) are not in the operating position are / are located and are only temporarily moved away.

These movable arrangement of the curtain holder to a component of the coating machine or the commissioned work makes it possible that the at least one curtain holder for the coating operation exactly is positioned and safely guiding the job media curtain ensured from the trailing edge to the counter surface, but if necessary also fast wegbewegbar is. In general, that is said mating surface a paper, cardboard or other fibrous web. It can also be the surface for indirect order an applicator roll or an endless belt.

In Advantageously, as a component to which the curtain holder movable is arranged, a support frame (or also called stinging) of the coating machine be.

A Another possibility is that as said Component for the movable arrangement of the at least one Curtain holder the application head of the curtain-commissioned work is provided. The movable arrangement may be appropriate exist in a simple suspension.

A further possibility of said component for the movable assembly may also be in the use of a coating medium gutter (see called start gutter) or an existing air boundary layer removal device consist of the curtain commissioned work.

In Under the invention, it is possible that the curtain holder for the purpose of rotational movement via a joint or a Hinge is connected to one of the components described above. This allows a movement to be achieved with the web running direction is rectified. A rotational movement can also after be directed outside, d. H. away from the machine center or in the transverse direction of the machine.

A Another possibility of movement of the at least one curtain holder is also that it is translationally movable. hereby For example, a straightforward method is possible to the outside. For this comes as a component, for example, a sliding bushing or a linear guide into consideration.

moreover Combined movements are also possible. Is preferred doing a movement that is a component in the direction of web travel contains, as this is an activation by external Forces favored.

Advantageous it is when the curtain holder in addition to the purpose of Format adjustment in the transverse or width direction of the curtain movable is.

Incidentally, with format adjustment, the width of the curtain and thus of the applied media film are meant. For this purpose, the already described linear movement comes into question. The curtain holder is able to swing with the same movement and when swinging back he can set a different format.

alternative is the format setting but also by a separate additional Movement possible.

at Format setting, only the curtain holder needs to be moved. Alternatively, it is possible that at the same time existing nozzle edge elements on a Gleitschichtdüse are present or even Düsenraumbegrenzer, in the nozzle gap are arranged to be offset with. By the simultaneous displacement of all edge components, it is possible the application medium without backlash and apply lossless.

The Solution according to the invention also allows the curtain holder can be locked in its respective position is. For example, a positive connection, a hook for the position in question provided so to speak. The hooking can, as I said, mechanically, positively respectively. But it is also a holder by magnetic force or Negative pressure etc. possible. The lock is manual or also remotely possible and is on a return movement unlock again.

A Lock in the tilted position of the curtain holder is usually then makes sense, if a new train is recovered or cleaning, maintenance or adjustment work performed become.

In the swiveled position (operating position) of the curtain holder For example, a simple stop, which is a reproducible correct Positioning ensures. The normal operating forces, resulting from the flowing application medium or the Air boundary layer, not able by the stop, the Move away the curtain holder. Bigger forces, as they occur, for example, when a web break, lead to a defined swinging. The curtain holders stay that way undamaged and ready to use.

Of the at least one curtain holder can be moved manually. This can be folded down before pulling in the web and after bring it back into operating position.

Instead of the manual movement of the curtain holder is also possible which takes place via an actuator. As an actuator, for example, a Pneumatic cylinder, a rotary actuator or otherwise in itself find known actuators use. This variant is at Retracting the web very suitable. The curtain holders let themselves fold down before retraction and after retraction bring back into operating position.

Of the Curtain holder can also be moved by automated means. Thereby the curtain holder can be swiveled very safe and fast, if detected a web break at some point in the coater has been. This automated panning is also very useful during a start or stop phase of the painting process.

Mentioned It should also be that the at least one curtain holder automatically or can be automatically reset. That can for example, by spring force. When the curtain holder by outer Forces, z. B. at a web break from the operating position can be pushed out, so they can automatically return to the operating position as soon as the outer Forces no longer work.

Begrudge is still that at least one curtain holder, which is the way between Transition edge and the mating surface or the fibrous web bridged, can touch the tear-off edge. But also a distance between the top edge of the curtain holder and the trailing edge, for example between 0 and 30 mm, is possible. Besides that is a distance between the lower edge of the curtain holder and the counter surface (or fibrous web) possible, this approx. between 0 and 2 mm.

The inventive commissioned work with the at least a movably arranged curtain holder can be both a per se known sliding layer nozzle as well as a slot nozzle or Twindüse or tandem nozzle. With this Commissioned work is a one-shift or multi-layered trained Curtain can be generated. The producible with the commission concerned Curtain can be both narrower than the width of the fibrous web (inboard), what is preferred here, but also wider than the web width (overboard) be.

following The invention is based on an embodiment closer explained. In a schematic representation:

1 a schematic representation of the curtain applicator according to the invention with curtain holders that define a curtain width that is less than the web width (inboard), seen in the machine direction;

2 : A schematic representation of the curtain applicator according to the invention with curtain holders that define a curtain width that is wider than the web width (overboard), seen in the machine direction

3 : A schematic, perspective view of the curtain-up according to the invention Tragwerkes with a first variant of the arrangement of the curtain holder

4 : A schematically illustrated side view of the curtain applicator according to the invention gem. 2 with a further variant of the arrangement of the curtain holder

5 : A schematic, perspective view of the curtain applicator invention according to 1 with a further variant of the arrangement of the curtain holder

6 : A schematic, perspective view of another design of the curtain applicator according to the invention with a further variant of the arrangement of the curtain holder

7 : A schematically illustrated side view of the curtain applicator according to the invention gem. 1 with another variant of the

Arrangement of the curtain holder

8th : A schematically illustrated side view of the curtain applicator according to the invention gem. 1 with a further variant of the arrangement of the curtain holder

In the figures are the same components provided with the same reference numerals.

In the 1 is a curtain commissioned work 1 for coating a running paper, cardboard or other fibrous web 2 with a liquid to pasty application medium from the front, so with a view of the machine longitudinal direction MD shown. It includes, in addition to some not shown here units such as air boundary layer control devices, start-stop collecting devices or drip pans, measuring devices, feed lines, etc. one above the fibrous web 2 and spaced from her and only roughly indicated curtain application head 3 , This order header 3 extends in the transverse direction QD of the machine, ie in the width direction of the fibrous web 2 , The order header 3 is here as a sliding layer nozzle 1.1 educated. This sliding layer nozzle 1.1 preferably serves a multi-layer job, but can also be designed for single-layer order. In the example, there are two exit columns 4 shown on each side with a nozzle edge limiter 5 are closed. Below and offset to the nozzle edge delimiters 5 is on each side, so leader page FS and drive side TS of the coater, a curtain holder 6 movably arranged.

The two curtain holders available here 6 set a width VB1 of the curtain 7 fixed, which is smaller than the web width BB and is therefore referred to as inboard driving style. The curtain 4 falls from a spoiler edge 8th of the order header 3 from essentially following the force of gravity, on the fibrous web 2 down and settles on its surface as a coating layer.

The curtain holder 6 serve the guidance and also format limitation of the approx. 200 mm long single or multilayer curtain 7 between the spoiler edge 8th and the surface of the fibrous web 2 at its margins 6a and 6b , The curtain holder 6 are in the width direction of the curtain 4 adjustable. In the examples shown are the two curtain holders 6 within the width of the fibrous web 2 , which is referred to as "inboard" driving.

The curtain holder 6 are at a distance A between 0 and 30 mm to the trailing edge 8th arranged. The adjustment of the curtain holder 6 can take place in the direction of the machine center so far that a distance B between the end of the exit slit 4 where the nozzle limiter 5 determines the nozzle width, and the side edge 6a respectively. 6b of the curtain are respected. The distance B is 0 to 500 mm. At 0 mm distance, no medium losses occur at the edge. Otherwise, the adjustment range depends on the type of application medium, ie, depending on the grade.

Shown in 1 is also that between bottom edge of the curtain holder 6 and the surface of the fibrous web 2 a distance C between 0 and 2 mm should exist. The lowest value is optimal for a job in the free train, so where the fibrous web 2 runs unsupported in the area of the application zone. If the fibrous web runs below the application zone via a support element, such as a roller, C = 0.3 mm is advantageous. 2 mm are possible, but this distance may cause a constriction of the curtain 7 reenter.

Furthermore, a further distance D between the web side edge should 2a respectively. 2 B and the curtain side edge 6a respectively. 6b consist. The distance D should be between 1 and 40 mm. The goal here is the smallest possible amount. The largest specified amount D is advisable if greater variations in the course of the web and / or inaccurately cut web edges 2a and or 2 B available. In experiments between 5 and 10 mm have turned out to be the most realistic.

In 2 is another design of a curtain applicator according to the invention, namely a slot nozzle 1.2 (in the art also referred to as a slot), which also as shown in the figure, curtain holder 6 having. These curtain holders 6 lay in the example and in contrast to 1 a Curtain width VB2, which is wider than the web width BB and therefore referred to as "overboard" in professional circles. The nozzle edge limiter 5 and the curtain holder 6 in the example are exactly on top of each other. The lower edge of the two curtain holders shown 6 is lower than the surface of the fibrous web in the overboard mode 2 , There is here a distance C2, which is smaller than 0 mm. The distance D2 between the edges 2a . 2 B the fibrous web 2 and the side edges of the curtain holders 6a respectively. 6b is between 1 mm and 40 mm.

The at the edges of the railway 2a and 2 B passing curtain excess 7.1 and 7.2 enters a below the fibrous web 2 also in the transverse direction QD extending catcher, such as drip tray 9 from which the collected medium is withdrawn. If desired, the medium can be regenerated and re-circulated to the commissioned work.

In 3 is a perspective view of the curtain applicator invention or the Gleitschichtdüse 1.1 a first variant of the arrangement of the curtain holder 6 shown. The curtain holder 6 are rotatory movable. This is done here by means of a hinge or swivel joint 10 which the curtain holder 6 with the curtain application head 3 combines. In solid line is the curtain holder 6 in operating position I and in dashed line it is shown in service position II (tilted position). By the way, here again the so-called inboard driving is shown. One recognizes the web width BB and the smaller curtain width VB1, as well as the corresponding application width AB on the surface of the fibrous web running in the direction L.

drawn for understanding are also the transverse direction QD and the machine direction MD.

4 shows a schematically illustrated side view of the curtain applicator invention - here in the form of a slot nozzle 1.2 -, as in 2 , Instead of in 3 shown rotational movement of the curtain holder 6 is shown a translational, rectilinear motion. The curtain holder 6 are via a linear guide 11 horizontally movable according to the web running direction L, as the horizontal arrow shows. This one wins a distance F between the operating position I and adjustment position II, wherein the adjustment position II is again indicated in dashed line. This linear guide 11 is at the curtain order header 3 attached. Incidentally, the fibrous web runs here 2 via a support roller 12 so the curtain 7 impinges on a supported area. Between the undercover of the in 4 visible curtain holder 6 and the surface of the fibrous web 2 is also in the 1 given distance C, which is between 0.3 and 2 mm.

5 shows a further schematic perspective view of the curtain applicator invention again in the form of in 1 shown Gleitschichtdüse 1.1 shown. The curtain holder 6 is in a further variant to the outside via a sliding bushing 13 translational and straight from the operating position I in an adjustment II - and vice versa - movable. Incidentally, the inboard driving style is also shown here. One recognizes the web width BB and the smaller curtain width VB1, as well as the corresponding application width AB on the surface of the fibrous web running in the direction L. Also marked here are the transverse direction QD and the machine direction MD.

In 6 is another schematic, perspective view of the curtain applicator invention, in the form of a so-called Twindüse 1.3 shown. The Twindüse 1.3 consists of two composite applicator head halves, each with a coating medium chamber for the dispensed medium M1 and M2. With the Twindüse two gleichgeartete (same rheology and / or composition) or different application media M1 and M2 can be submitted. The media or the respective fall from the two downwardly directed slot nozzle 14 and thereby form a double-layer curtain, which is a double layer in the order width AB on the fibrous web 2 stores.

Instead of in 3 Rotational movement shown, the pivoting takes place below the two slot nozzles 14 located curtain holder 6 in this variant to the outside, so away from the machine center. The pivoting movement due to the movable arrangement of the curtain holder 6 from the operating position I in the adjustment position II is indicated by a curved arrow. The adjustment position is again shown in dashed line. Incidentally, the inboard driving style is also shown here. One recognizes the web width BB and the smaller curtain width VB1, as well as the corresponding application width AB on the surface of the machine direction MD moving fibrous web.

To the Understanding here is also the transverse direction (cross direction) QD.

7 shows a further schematically illustrated side view of a curtain applicator in the form of the already shown Gleitschichtdüse 1.1 gem. 1 , with a further variant of the arrangement of the curtain holder 6 , The one in the side view of 7 visible curtain holder 6 is here again on the up contract head 3 attached, including a movable bar 15 to connect curtain holder 6 with the order header 3 serves.

The bar 15 may suitably be designed as a spiral spring, which acts in the operating position against a stop not shown here. By acting in this case spring force is the curtain holder 6 automatically deflected first and returned from the deflection position II back to the operating position I. This is the case, for example, when external forces that caused the deflection (eg web break) no longer work.

At the bottom of the curtain holder 2 is in 7 also a hook-like training 16 indicated with the curtain holder 6 in another variant manually or remotely controlled in a form-fitting receiving part 17 arretierber is. This lock can be present in the operating position I and / or in the service or adjustment position II. For a return movement is the curtain holder 6 unlock again.

8th shows a further schematically illustrated side view of the Gleitschichtdüse 1.1 , This should be indicated that the curtain holder 6 through an actuator 18 is movable. As an actuator 18 here serves a pneumatic cylinder, the curtain application head 3 is articulated. The deflection or adjustment position II is again shown in dashed line

It are other variants conceivable, which also combinations of the shown Examples may contain.

When Curtain commissioned work are also other designs than they are in Examples given are usable. Such would be, for example also a so-called tandem nozzle for a multi-layer application, in the multiple slot nozzle heads in the machine direction strung together, can be used.

1.1

Curtain applicator in the form of a sliding layer nozzle

1.2

Curtain applicator in the form of a slot nozzle

1.3

Curtain applicator in the form of a twin slot nozzle

2

Fibrous web

3

Curtain applicator head

4

exit slit

5

Düsenrandbegrenzer

6

curtain holders

6a, 6b

margin the curtain holder

7

curtain

7.1 7.2

Curtain surplus

8th

tear-off edge

9

drip tray

10

swivel

11

linear guide

12

supporting roll

13

bush

14

slot

15

portable strip

16

hooked education

17

receiving part

18

actuator

A, B, C, D, F

distance

L

Web direction

FROM

application width

BB

web width

MD

machine direction

QD

transversely

FS

tender side

TS

drive side

VB1

curtain width

VB2

curtain width

M1, M2

application medium

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• DE 10232949 A1 [0002]
• - DE 102008040409 [0003, 0003]
• - DE 102007000778 [0003]

Claims (12)

Curtain commissioned work ( 1.1 . 1.2 . 1.3 ) for coating a running paper, board or other fibrous web ( 2 ) in a coater, comprising one above the fibrous web ( 2 ) and at least the width of the fibrous web ( 2 ) corresponding curtain order header ( 3 ) for dispensing at least one liquid to pasty application medium (M1, M2) in the form of a monolayer or multilayer curtain ( 7 ), which essentially follows the fibrous web following gravity ( 2 ), whereby to guide the curtain ( 7 ) across its fall path, ie between a trailing edge ( 8th ) of the order header ( 3 ) and the surface below the gun ( 3 ) longitudinally (MD) moving fibrous web ( 2 ) on at least one side edge of the curtain ( 7 ) a curtain holder ( 6 ), further comprising a coating medium collecting channel and an air boundary layer removal device, characterized in that the curtain holder ( 6 ) movably on a component of the coating machine or the curtain applicator ( 1.1 . 1.2 . 1.3 ) is arranged so that the curtain holder ( 6 ) during the operation of the commissioned work ( 1.1 . 1.2 . 1.3 ) is held in its operating position (I), but still allows him to leave his operating position (I). Curtain coater according to claim 1, characterized in that that said component is a support frame of the coater. Curtain coater according to claim 1, characterized in that said component is the applicator head ( 3 ) of the curtain commissioned work ( 1.1 . 1.2 . 1.3 ). Curtain coater according to claim 1, characterized in that said component comprises the application medium collecting channel or the air boundary layer removal device of the curtain applicator ( 1.1 . 1.2 . 1.3 ). Curtain coater according to one of claims 1 to 4, characterized in that the curtain holder ( 6 ) for rotary movement via a hinge or via a hinge ( 10 ) is connected to said component. Curtain coater according to one of claims 1 to 4, characterized in that the curtain holder ( 6 ) for translational movement via a sliding bushing ( 13 ) or a linear guide ( 11 ) is connected to said component. Curtain coater according to at least one of the preceding claims, characterized in that the curtain holder ( 6 ) additionally in Ouer- or width direction (QD) of the curtain ( 4 ) is movable. Curtain coater according to at least one of the preceding claims, characterized in that the curtain holder ( 6 ) in its respectively located position (I, II) can be locked. Curtain coater according to at least one of the preceding claims, characterized in that the curtain holder ( 6 ) is manually movable. Curtain coater according to at least one of the preceding claims, characterized in that the curtain holder ( 6 ) via an actuator ( 18 ), for example pneumatic cylinder, is movable. Curtain coater according to at least one of the preceding claims, characterized in that the curtain holder ( 6 ) is moved by automated means. Curtain coater according to at least one of the preceding claims, characterized in that it is in the form of a sliding layer nozzle ( 1.1 ) or slot nozzle ( 1.2 ) or Twindüse ( 1.3 ) or tandem nozzle is applicable.