DE102010042560A1 - Method for operating an application device for applying liquid to pasty application media in the form of at least one free-falling curtain and application device - Google Patents

Abstract

The invention relates to a method for operating an application device (1) for applying liquid to pasty application media (A1, An, An-1) in the form of at least one freely falling curtain (14) onto a fibrous web (F) with at least one distribution chamber (4.1, 4.n, 4.n-1) having application head (2) and an application media supply system (9) assigned to the application head (2). The invention is characterized in that in the start-up phase of the application device (1), the application head (2) is operated with a fluid different from the application medium (A1, An, An-1), in particular water. The invention also relates to an application device (1).

Description

The invention relates to a method for operating an application device for applying liquid to pasty application media in the form of at least one free-falling curtain on a fibrous web with a, at least one distribution chamber having applicator head and the application head associated application media supply system.

The invention further relates to an application device for applying liquid to pasty application media in the form of an at least two-layer free-falling curtain on a fibrous web, comprising a gun with at least one distribution chamber, which is connected in each case via a feed gap with a discharge opening on the gun and a Auftragmedienversorgungssystem.

A fibrous web is understood to mean a material web in the form of a paper, board or tissue web.

Application media are understood as all liquid or pasty media which are suitable for refining the surface of a fibrous web or imparting certain functions to it. Preferably, coating color, i. H. a paint of pigments, binders, water and additives used.

Devices for single or multi-layer application of application medium in the form of a free-falling curtain on a movable fibrous web, in particular curtain applicators, are already known in different embodiments from the prior art. These generally have a single-layer or multi-layer application head, comprising at least one distribution chamber arranged in the application head and extending across the application head in the width direction and via a supply line with application medium, which is in each case coupled to a delivery opening via a supply line. Depending on the execution of the application head, the application medium occurs either directly in the direction of gravity to form the free-falling curtain, or the individual discharge opening leads to an inclined sliding surface on which the application medium is guided and delivered at a tear-off as a free-falling curtain. In the case of multi-layer applicator heads of this type, the individual delivery openings connected to different distribution chambers are arranged one after the other on the sliding surface in the direction of flow of the application media, so that the application media emerging via the latter overlap one another in layers.

A high-quality coating requires the formation of a stable closed curtain, which can only be produced in a system that is completely deaerated and free of other particles which disturb the formation of the curtain. Therefore, the application head is vented in the start-up phase by the application of application medium, which emerges via the discharge openings in a more or less stable formed curtain in the direction of gravity either directly or guided over a sliding surface. Since this part of the application medium is not suitable for the coating and therefore would cause a high reject rate when hitting the fibrous web, this part is collected on application medium in a catcher outside the fibrous web. For this purpose, collecting device and / or application head can be moved relative to one another and / or to the fibrous web. The actual operation after reaching a stable closed curtain is then achieved by pivoting either the catcher or the pivoting of the applicator head in the operating position. In this case, the collecting device and the subsequent in fibrous web passage direction components of the machine for the production and / or finishing of a fibrous web are largely contaminated with the application medium, so that a complex, time-consuming and by the required use of appropriate cleaning chemicals little environmentally friendly cleaning of the soiled components is required.

Furthermore, the use of multi-layer guns in the start-up phase or circulation operation after demolition, in some cases considerable amounts of mixed application media, due to the still occurring exit of these different application media from the discharge openings. In the best case, the resulting mixing medium can be returned directly to one of the supply strands. In general, however, the mixed application medium must be collected separately and dosed in a suitable manner to one of the supply lines, worked up or even disposed of. Depending on the application head system used and the current process management, the amount of application media mixed with one another can vary. A special challenge here are application head versions with pointing towards the fibrous web slot nozzles with direct delivery of the application media from the discharge openings down. In these must for the duration of the start-up phase from all in use discharge openings continuously operating medium escape so that a complete venting of the nozzle chambers allows so that during these phases of operation significant amounts of mixed order media are incurred. In case of necessary business interruptions, such as pulp web breaks, the supply of Distribution chambers to prevent the ingestion of air are maintained in this. But even with execution of the application head as a nozzle block with upwardly, ie directed away from the fibrous web open nozzles, the problems mentioned in the start-up phase. Such a device for applying at least one application medium, in particular coating color in the form of at least one free-falling curtain on a fibrous web, comprising a above the fibrous web and spaced therefrom arranged multi-layer applicator head with a plurality of distribution chambers and associated discharge openings is from the document DE 10 2007 00 801 A1 previously known.

The invention is therefore based on the object, a device for applying liquid to pasty application media, in particular coating color in the form of a single or multi-layered free-falling curtain on a fibrous web, comprising a gun with at least one distribution chamber, and a Auftragmedienversorgungssystem further develop such that the cleaning effort After the start-up phase can be minimized and incurred in some operating phases occurring high levels of intermixed application media for applicator heads suitable for multi-layer application are minimized. Also, the coated with such mixed application media fibrous web Committee should be kept low. The design and control engineering effort for the solution according to the invention should also be kept as low as possible.

The solution according to the invention is characterized by the features of claims 1 and 10. Advantageous embodiments are described in the subclaims.

The inventive method for operating a coating device for applying liquid to pasty application media in the form of at least one free falling curtain on a fibrous web with a, at least one distribution chamber having applicator and assigned to the applicator application media supply system according to the invention is characterized in that in the start-up phase of the applicator and / or immediately after the end of an operating phase and / or after an outline of the fibrous web, the applicator head is at least partially operated with a different fluid from the application medium, in particular water.

A fluid other than the application medium is understood as meaning a fluid which, when hitting the fibrous web and / or pivoting the collecting device or the application head, causes only minor or no contamination of the components of the application media supply system or of components of the machine for producing and / or finishing a fibrous web causes. Preferably, water is used which is provided as fresh water or as process water from other processes of the machine for producing and / or finishing a fibrous web.

The start-up phase of the application device is understood to be the partial region of the overall operating region of the application device which, after a standstill of the application device or interruption of the application media supply, provides ready operation for forming a closed stable application media curtain. In this phase, the required venting of the applicator head, which is now realized according to the invention by the operation of the applicator head with water. By loading the gun with water to be completed in a simple and cost-effective manner all the cavities, flushed and cleaned the gun at the same time and creates a closed curtain water. After switching to the supply of application medium thus air pockets and / or breaks in the order media curtain are avoided.

However, the venting / rinsing with water can also start directly after an operating phase or a demolition, even if no new order operation, in particular coating operation is imminent. This prevents the application medium from drying and keeps the application head ready for the next job operation, regardless of the time until then.

The venting by rinsing with water also has the advantage that contamination of components of the machine for producing and / or finishing a fibrous web as known from the prior art, and thus a costly cleaning can be avoided. Furthermore, the venting can also take place in the operating position of the application head, without having to make costly adjustments of the latter and / or the collecting device after switching to the operating mode with application medium.

In one embodiment, the supply of the applicator head takes place with a different fluid from the application medium, in particular water. In this, the supply of application medium is only reduced. By switching off the different fluid from the application medium, especially water is switched to the required amount for the coating weight of application medium. In a particularly advantageous embodiment, however, the applicator head is acted upon solely by medium different from the application medium, in particular water, with residues disregarded by the switchover. After switching to application medium no additional water is pumped into the curtain.

• – Zeitdauer des Betriebes mit einem von Auftragsmedium verschiedenen Fluid, insbesondere Wasser
• – Volumenstrom eines von Auftragsmedium verschiedenen Fluides, insbesondere Wasser zur zumindest einen Verteilkammer
• – zeitliche Abfolge der Beaufschlagung der einzelnen Verteilkammern mit einem von Auftragsmedium verschiedenen Fluid, insbesondere Wasser bei Vorhandensein mehrerer Verteilkammern
• – Strömungsgeschwindigkeit.

Advantageously, the operation of the applicator head is controlled by water. The control offers the advantage of being able to optimize the start-up phase. Preferably, during operation of the application device with a fluid different from the application medium, in particular water, at least one of the variables mentioned below is controlled to at least indirectly describe this mode of operation:

• - Duration of operation with a different of application medium fluid, especially water
• Volume flow of a different fluid from application medium, in particular water to at least one distribution chamber
• - Time sequence of the admission of the individual distribution chambers with a different fluid from application medium, in particular water in the presence of several distribution chambers
• - flow velocity.

The duration of the operation with a different fluid from the application medium, in particular water can be fixed or set as a function of an event, a state or a change of state. As a result, the period of time can be actively adapted to the specific conditions of the application device and thus optimized with regard to the concretely present boundary conditions and operated in an energy-efficient and resource-saving manner.

As a triggering event for limiting the duration of application of the applicator head with a different fluid medium, in particular water, the formation of a closed free-falling curtain of water before impinging on the fibrous web or a catcher, the event of the first impact of a closed free falling curtain of water on the fibrous web or a catcher or the expiration of a certain period of time of impact of the curtain of water on the fibrous web or a collecting device are considered. The concrete selection depends on the existing boundary conditions of the application. Preferably, however, the duration is controlled with a view to minimizing it.

The supply of the applicator head with a fluid other than the application medium, in particular water, can take place in a first embodiment via a separate venting / flushing system assigned to the applicator head, which can be coupled directly to the individual distribution chamber (s), during which the fluidic connection between Order media supply system and order header is interrupted. In this case, the application medium can already be provided in the order media supply system up to the location of the fluidic interruption so that the application medium is already available when switching between the ventilation / rinsing system and the application medium supply system.

In a second, particularly advantageous embodiment, the supply of the application head takes place with a different fluid from application medium, in particular water during the start-up phase and / or after the end of an order operation and / or after a demolition of the fibrous web with at least partial use of the order media supply system, the an impingement with water-free flow paths of the order media supply system are fluidically decoupled from the at least one distribution chamber. This embodiment has the advantage that on the one hand dispensed with a separate venting / flushing system or this can be provided with minimal effort by using existing interconnections. Furthermore, the affected components of the order media supply system are also rinsed and cleaned.

The transition between the start-up phase and the operating phase is preferably carried out by switching between the application of a fluid other than application medium, in particular water and application medium. The switching can take place in such a way that the supply either takes place alternatively with application medium or with a fluid other than application medium, in particular water, or else at least partially overlapping. The first-mentioned variant offers the advantage that mixing of fluid other than the application medium, in particular water and application medium, can be avoided.

In a particularly advantageous further development of the second embodiment, in a multi-layer application applicator head with an application media supply system comprising supply strands respectively associated with each distribution chamber and having a platen supply unit, at least one first supply strut directly coupled to one of the distribution plenums is at least temporarily associated with at least one further other distribution plenum fluidically connected. In the start-up phase of the application device after a standstill or a fault, in particular a demolition of the fibrous web and / or after the end of a job and / or after a demolition of the fibrous web components of the order media supply system for venting / flushing the applicator head are used, wherein the at least one first supply line with a supply unit for a different of application medium fluid, especially water is coupled and the different fluid from application medium, in particular water on the fluidic coupling of the first supply line with at least a further other distribution chamber is supplied to this, wherein at least several of the other distribution chambers are deaerated and / or flushed simultaneously or successively. This design allows effective venting / flushing with minimal effort.

• – zeitgleiche oder aufeinanderfolgende strömungstechnische Verbindung des mit einer Verteilkammer direkt gekoppelten ersten Versorgungsstranges mit allen weiteren anderen Verteilkammern;
• – zeitgleiche oder aufeinanderfolgende strömungstechnische Entkopplung der weiteren anderen Verteilkammern von den Auftragsmediumversorgungseinheiten der diesen direkt zugeordneten Versorgungsstränge;
• – zeitgleiche oder aufeinanderfolgende strömungstechnische Ankopplung einer Versorgungseinheit für ein von Auftragsmedium verschiedenes Fluid an den ersten Versorgungsstrang.

In the start-up phase of the device after a standstill or a fault, in particular a pulp web tear, in this preferred embodiment of the method, the following process steps are preferably carried out simultaneously or successively:

• - Simultaneous or sequential fluidic connection of the directly coupled to a distribution chamber first supply line with all other other distribution chambers;
• - Simultaneous or successive fluidic decoupling of the other other distribution chambers of the order medium supply units of this directly associated supply lines;
• - Simultaneous or sequential fluidic coupling of a supply unit for a different of application medium fluid to the first supply line.

During the start-up phase of the application device, upon admission of the first supply line and via all of the distribution chambers with water, preferably a guide of the application medium assigned to the individual distribution chamber already bypasses the distribution chamber and back to the application medium supply unit of the respective other other supply line in order to ensure rapid operational readiness.

In terms of apparatus, the applicator device according to the invention is for applying liquid to pasty application media in the form of an at least one or multilayer free-falling curtain on a fibrous web, comprising an applicator head with at least one distribution chamber, which is connected via a feed gap to a dispensing opening on the applicator head and a Auftragmedienversorgungssystem characterized in that means are provided for at least temporary admission to the applicator head with a different fluid from application medium, in particular water.

In an advantageous embodiment of the application device, a separate or constituent of the application medium supply system using venting / flushing system is provided, and the means for at least temporary loading of the applicator with a different application medium fluid, especially water comprise means for alternative or simultaneous coupling / decoupling of the venting / Rinsing system and the order media supply system to the individual distribution chamber. Depending on the execution of the application head all distribution chambers are simultaneously or sequentially applied with water.

An inventive method will be explained below with reference to the figures. It details the following:

1a shows a schematic highly simplified representation of an application device;

1b shows on the basis of a signal flow diagram the sequence of a method according to the invention in an application device according to FIG 1a ;

2a shows in schematic highly simplified representation of an alternative embodiment of an applicator device;

2 B illustrates the operation of the order medium supply system with partial utilization as a venting / flushing system for a design according to a signal flow diagram 2a ,

The 1a Illustrates a schematically simplified representation of an application device 1 for applying liquid to pasty application media in the form of at least one single or multi-layer free-falling curtain on a, a machine for producing and / or finishing continuous material web in the form of a fibrous web F.

The fibrous web F can be present as a paper, board or tissue web. The position of the fibrous web F during the order opposite the applicator 1 is indicated here by a broken line. The direction of movement through the applicator is represented by an arrow.

The applicator 1 in 1 comprises a above the fibrous web F spaced from this arranged applicator head 2 , which is designed here as a multi-layer applicator head. This is in the illustrated case for example as a so-called sliding body or sliding block 3 executed. The order header 2 has distribution chambers 4.1 and 4-n , with n> 1, whose number is determined as a function of the number of layers to be generated. In the case shown, by way of example, three distribution chambers 4.1 . 4-n and 4.n-1 for accommodating and distributing application media A1, An, An-1 across the device width. These are in the order header 2 arranged and extend transversely to the direction of movement of the fibrous web F across the width of the applicator head 2 , The extension in the width direction determines the width of the possible order. The order media A1, An, An-1 can be selected differently or at least partially the same. The individual distribution chambers 4.1 . 4-n and 4.n-1 are each via a feed gap 5.1 . 5.n and 5.n-1 with a discharge opening 6.1 . 6.n and 6.n-1 at one on the order header 2 trained sliding surface 7 coupled fluidically, in particular connected. The sliding surface 7 is relative to the under the order header 2 formed inclined relative to this guided fibrous web F and ends with a trailing edge 8th , on which the on the sliding surface 7 superimposed individual layers of application medium by gravity in the form of a curtain 14 fall down on the movable fibrous web F below. During the coating process are from the inside of the application head 2 , in particular of the sliding block 3 , in each case the application media A1, An and An-1 from the distribution chambers 4.1 . 4-n and 4.n-1 in the feed columns 5.1 . 5.n and 5.n-1 in the direction of the individual discharge openings 6.1 . 6.n and 6.n-1 transported and occur at the discharge openings 6.1 . 6.n and 6.n-1 out, then over the inclined sliding surface 7 to be deposited on top of each other and then by gravity from the trailing edge 8th in the form of the curtain 14 to be able to fall down. In the illustrated embodiment with the three in the sliding surface 7 opening discharge openings 6.1 . 6.n and 6.n-1 is the curtain 14 three layers. The individual distribution chambers 4.1 . 4-n and 4.n-1 are in the direction of movement of the fibrous web F considered successively arranged and aligned parallel to each other. By analogy, this also applies to the discharge openings 6.1 . 6.n . 6.n-1 ,

To supply the applicator 1 with the order media, in particular for the supply of the individual distribution chambers 4.1 . 4-n and 4.n-1 , this is a job media supply system 9 assigned. The order media supply system 9 In this case, by way of example, it includes an application medium supply unit provided for each layer or layer of application medium 10.1 . 10.n and 10.n-1 that communicate with the respective distribution chamber 4.1 . 4-n and 4.n-1 under formation of a supply strand 11.1 . 11.n and 11.n-1 is directly coupled. The single application medium supply unit 10.1 . 10.n and 10.n-1 typically includes a job media supply source and / or a job media preparation unit. The coupling with the individual distribution chambers 4.1 . 4-n . 4.n-1 takes place in the simplest case via one line connection. Each distribution chamber 4.1 . 4-n and 4.n-1 Here is such a supply strand 11.1 . 11.n . 11.n-1 assigned. The individual supply strands 11.1 . 11.n and 11.n-1 each allow the supply of different application media A1, An, An-1 to the individual distribution chambers 4.1 . 4-n and 4.n-1 , According to the invention takes place during the start-up phase of the application device, the vent by the operation of this with a neutral fluid, preferably water. For this purpose, the individual distribution chambers 4.1 . 4-n and 4.n-1 temporarily charged with water and possibly a curtain 14 on water over the gun 2 issued. The operation with water is preferably controlled, ie the duration of this designated as start-up phase portion of the total operating range can be optimized with respect to different criteria. For this purpose, the application device is preferably a control device 25 assigned. This may be the process control of the applicator anyway 1 act acted control device.

The basic process steps of the process according to the invention are described in 1b illustrated by a signal flow diagram. The venting process is the desired commissioning of the applicator 1 or the initiation of the start-up phase initiated. For this purpose, in method step VA, the presence of at least one, a desired commissioning of the application device 1 or the initiation of the start-up phase at least indirectly characterizing size monitored and detected and as the input XE1 of the control device 25 fed. Otherwise, the applicator remains 1 disabled. The order header 2 is operated in the presence of an initiation of the start-up phase at least indirectly characterizing size with water. For this purpose, in method step VB, an adjusting device for acting on the individual distribution chambers 4.1 . 4-n and 4.n-1 operated with water. Depending on the design of the order media supply system 9 may be the admission under at least partial utilization of the order media supply system 9 or via a separate venting / flushing system 26 , which in a first sub-variant taking advantage of components of the supply strands 11.1 . 11.n . 11.n-1 is formed or according to a second sub-variant of the distribution chambers 4.1 . 4.n-1 . 4-n free from coupling with the supply lines 11.1 . 11.n . 11.n-1 applied. The second variant is indicated by a broken line. In this case, the units form order media supply units 10.1 . 10.n . 10.n-1 and supply lines 11.1 . 11.n . 11.n-1 and the venting / flushing system 26 each independent systems, which are operated in different operating phases.

In the first case, the supply of water can be completely over the individual order medium supply units 10.1 . 10.n . 10.n-1 and the supply lines coupled thereto 11.1 . 11.n . 11.n-1 done or taking advantage of at least components of the supply strands 11.1 . 11.n . 11.n-1 , in which case means 30 for coupling a supply unit 34 for water with the individual supply lines 11.1 . 11.n . 11.n-1 are provided. The control is carried out, for example, by specifying at least one manipulated variable YA1 for controlling the means 30 or for the second variant of the deaeration / flushing system 26 ,

The water gets out of the distribution chambers 4.1 . 4-n and 4.n-1 over the discharge openings 6.1 . 6.n . 6.n-1 delivered and can in a catcher 17 be caught. In this case, the fluid emerging from the discharge openings forms a curtain. With fully vented distribution chamber 4.1 . 4-n and 4.n-1 this is closed and stable. The application of water takes place only temporarily. The period of time can be permanently preset or optimized, in particular minimized, depending on the design conditions. The optimization takes place as a function of at least one event, one state and / or one state change. These are the exit from the discharge opening 6.1 . 6.n . 6.n-1 and / or the formation of the curtain 14 monitored in VE. Upon occurrence of the event, a state and / or a change in state, a switchover to the actual supply of the distribution chambers takes place 4.1 . 4-n and 4.n-1 with application medium A1, An, An-1 in VD. The supply of the distribution chambers 4.1 . 4-n and 4.n-1 with water is interrupted or deactivated. For this purpose, corresponding manipulated variables YA2 to the actuators of the order media supply system 9 , in particular the individual order medium supply units 10.1 . 10.n . 10.n-1 and / or supply strands 11.1 . 11.n . 11.n-1 delivered and YA3 to the actuators of the funds 30 for coupling / decoupling the supply source for water or the venting / flushing system 26 from the distribution chambers 4.1 . 4-n and 4.n-1 over the control device 25 output.

In step VE, the presence of a desired interruption of the order or deactivation of the application device 1 monitors at least indirectly characterizing size, for example, as an input XE2 in the control device 25 is processed. This can be a, a desired interruption, such as shutdown of the applicator 1 at least indirectly characterizing size or a, a disturbance detecting size, which makes a shutdown makes sense or makes necessary act. In VF, the deactivation or decommissioning of the application device takes place 1 , Then VA is again monitored to see if commissioning is desired.

The individual supply strands 11.1 . 11.n . 11.n-1 or the distribution chambers 4.1 . 4-n . 4.n-1 can be coupled successively or simultaneously with the supply unit for water.

The 2a shows a particularly advantageous application device 1 in which the inventive method can be implemented particularly easily and quickly. These are the individual supply strands 11.1 . 11.n and 11.n-1 so interconnected that at least a first supply strand 11.1 optionally for the sole supply of at least one further, actually acted upon by another supply strand distribution chamber and thus a plurality of distribution chambers is suitable. These are device-wise means 13 for optionally additional fluidic connection of at least one of a distribution chamber of the distribution chambers 4.1 . 4-n and 4.n-1 associated first supply line provided with at least one other other distribution chamber. The means 13 are designed and arranged in the illustrated case, that this the first supply line 11.1 optionally in addition to the existing coupling with the distribution chamber 4.1 with at least one, here the other other distribution chambers 4-n and 4.n-1 can connect. The connection is made via switchable fluidic connections of the supply line 11.1 with the supply lines 11.n and 11.n-1 , The means 13 For this purpose, each comprise a fluidic connection designed as a line connection 15.1 and 15.2 between the first supply line 11.1 and the other supply lines shown 11.n and 11.n-1 as well as facilities 16.1 and 16.2 for the selective release or interruption of these fluidic connections 15.1 . 15.2 , Here is the device 16.1 the fluidic connection 15.1 and the device 16.2 the fluidic connection 15.2 assigned. The facilities 16.1 and 16.2 are formed in the simplest case as valve devices which are characterized at least by two switching positions, either the release or the interruption of the individual fluidic connection 15.1 . 15.2 serve. However, the valve devices can also be control or regulating valves, which, in addition to the two basic functions, also permit control and / or regulation of the flow rates.

The means 13 In this case, they can be designed or operated differently with respect to the mode of operation. Preferably, these are designed and designed such that they are both the sole coupling with only one other other supply strand 11.n or 11.n-1 as well as a coupling with all other supply lines 11.n and 11.n-1 enable.

Also provided is a job media return device 12 , which in the case of a web break, the amount of order media, which with the free-falling curtain 14 exit, and either within the order media supply system 9 processed and / or in this one supply strand, preferably the first supply strand 11.1 directly or to a disposal unit. The order media return device 12 includes a catcher 17 for receiving or for collecting the non-impact on the fibrous web F application medium or application media. This is with the first supply line 11.1 , in particular the application medium supply unit 10.1 , can be coupled. The coupling takes place via a switchable fluidic connection, comprising a connecting line 23 , The optional interruption or release and thus decoupling / coupling of the catcher 17 from / to the supply line 11.1 is done through appropriate means 22 comprising in the simplest case one in the connecting line 23 arranged valve device in the form of a switching valve with at least two switching positions. The connection of the catcher 17 with a treatment system and / or a disposal unit via a switchable fluidic connection, comprising in the simplest case, a connecting line 24 and means 35 for the optional interruption or release of the fluidic connection and thus decoupling / coupling of the collecting device 17 from / to the refurbishment system or a disposal unit.

To a trouble-free supply of the other other distribution chambers 11.n . 11.n-1 with medium from the first supply line 11.1 To ensure, it is also necessary, the fluidic connection in these other supply lines 11.n . 11.n-1 between application medium supply unit 10.n . 10.n-1 and distribution chamber 4-n . 4.n-1 in this phase of operation. These are means 19 for selectively coupling / decoupling this at least one other other distribution chamber 4-n . 4-1 with / from the order medium supply units 10.n . 10.n-1 in the associated supply lines 11.n . 11.n-1 intended. The means 19 in the case illustrated comprise valve devices 20.n and 20.n-1 in the respective supply lines 11.n and 11.n-1 in that the selective interruption or release of the flow paths between the respective application medium supply unit 10.n and 10.n-1 and the distribution chamber 4-n and 4.n-1 serve. The realization of the fluidic connection 15.1 , 15.2 of the first supply line 11.1 with the other supply lines 11.n and 11.n-1 takes the valve devices 20.n and 20.n-1 downstream. At the valve devices 20.n and 20.n-1 it may be simple switching valves with at least two switching positions, the release or the complete interruption of the fluidic connection within the individual supply line 11.n respectively. 11.n-1 serve.

In an advantageous development is in, the other other distribution chambers 4-n . 4.n-1 associated supply lines 11.n and 11.n-1 one switchable bypass each 18.n and 18.n -1 to the distribution chamber 4-n . 4.n-1 intended. In this can order medium An, An-1 in the supply line 11.n . 11.n-1 in the bypass 18.n . 18.n-1 to the distribution chamber 4-n and 4.n-1 in a cycle via the application medium supply unit 10.n . 10.n-1 be guided. This is the single bypass 18.n . 18.n-1 in the flow direction in each case the means 19 and thus the valve device 20.n . 20.n-1 upstream in the supply line 11.n and 11.n-1 arranged. For optional coupling / decoupling of the bypass 18.n . 18.n-1 are means 27 intended. These comprise by way of example at least one valve device 21.n . 21.n-1 with at least two functional or switching positions.

All valve devices 20.n . 20.n-1 , as well as the valve means of the means 16 . 22 . 35 In addition to the design as a simple switching valves as control and / or control valves that take over this basic function, however, are formed.

The deaeration / flushing system 26 for the order header 2 is through the utilization of the line connections and functional elements of the order media supply system 9 characterized. This is a fluidic connection 29 between the first supply line 11.1 and a supply unit, not shown, provided for water, which optionally by means of appropriate means 30 for coupling / decoupling to the supply line 11.1 can be switched. The means 30 comprise in the simplest case, a valve device, in particular switching valve or control valve. The fluidic connection 29 is by coupling a coupled to the supply unit for water supply line to the supply line 11.1 realized. In addition, the supply line 11.1 with funds 31 for optional coupling / decoupling of the supply line 11 with / from the application medium supply unit 10.1 provided, which preferably a simple switching valve with at least two switch positions include. Their function essentially corresponds to the function of the valve devices 20.n and 20.n-1 , The coupling of the venting / flushing system 26 to the supply line 11.1 takes place in the flow direction behind the valve means of the means 31 ,

To implement further functions, it is provided by way of example that this is done via a single application medium supply unit 10.1 . 10.n , 10.n-1 the individual distribution chambers 4.1 . 4-n and 4.n-1 fed medium can be individually controlled and regulated. These are in the fluidic connection 15.1 and 15.2 provided valve devices designed as a control and / or control valve. Furthermore, in addition or optionally, at least one further valve device 28 in the supply line 11.1 intended. This is in the flow direction of the fluidic coupling of the individual supply strands 11.n and 11.n-1 to the supply line 11.1 downstream. This can be carried out in such a way, taking over the function of a metering device.

Also conceivable is the coupling / decoupling of the supply line 11.1 with / from an emptying line 32 , The coupling / decoupling is via means 33 comprising at least one valve device implemented. This allows the emptying line 32 be switched on or off.

The operation for the purpose of venting is based on a signal flow diagram in 2 B played.

According to 2 B takes place after detection of the start-up phase in step VA, the decoupling of the supply strands 11.n and 11.n-1 from the distribution chambers 4-n and 4.n-1 in method step VA1 and in method step VA2 the decoupling of the supply line 11.1 from the distribution chamber 4.1 by actuation of the valve devices 20.n . 20.n-1 and the valve means of the means 31 , These are closed. About the coupling of the supply strands 11.n and 11.n-1 to the supply line 11.1 In method step VA3 it is ensured that a supply of all three distribution chambers 4.1 . 4-n and 4.n-1 about that in the supply line 11.1 Injected water is guaranteed. In process step VB then the coupling of the venting / flushing system takes place 26 by coupling the fluidic connection 29 to a supply unit for water, not shown here, which via the valve means of the means 30 is guaranteed. This will be in the behind the application medium supply unit 10.1 lying part of the supply strand 11.1 Water introduced and the respective fluidic connections 15.1 . 15.2 with the other supply lines 11.n and 11.n-1 the respective distribution chambers 4.1 . 4-n . 4.n-1 fed. In the order header 2 the water gets over the discharge openings 6.1 . 6.n . 6.n-1 to the sliding surface 7 delivered, at this to a spoiler edge 8th guided and in the form of a hanging curtain 14 issued. The water gets over the catcher 17 collected. From there it can either supply the supply 11.1 be re-supplied or delivered to a disposal facility, which for example via the connecting line 24 can be done.

The 2 B illustrates an embodiment in which all distribution chambers 4.1 . 4-n . 4.n-1 be rinsed simultaneously. It is also conceivable to rinse them one by one and one after the other, which is then achieved by a corresponding chronological sequence of the coupling / decoupling of the individual supply strands 11.n . 11.n-1 with / from the supply line 11.1 can be realized.

It then close, as in 1b already executed, the process steps VC to VF.

LIST OF REFERENCE NUMBERS

1

Applicator for applying liquid or pasty application media

2

gun

3

sliding block

4.1, 4.n,

distribution chamber

5.1, 5.n, 5.n-1

feed gap

6.1, 6.n, 6.n-1

discharge opening

7

sliding surface

8th

tear-off edge

9

Application media supply system

10.1, 10.n, 10.n-1

Application medium supply unit

11.1, 11.n, 11.n-1

supply line

12

Application media recirculation device

13

Means for selectively additional fluidic connection of at least one supply line associated with a distribution chamber with at least one further distribution chamber

14

curtain

15.1, 15.2

fluidic connection

16.1, 16.2

Device for release or Interruption of the fluidic connection

17

catcher

18.n, 18.n-1

bypass

19

Means for selective coupling / decoupling

20.n, 20.n-1

valve means

21.n, 21.n-1

valve means

22

medium

23

connecting line

24

connecting line

25

control device

26

Prime / flush system

27

medium

28

valve means

28.n, 28.n-1

Auftragsmediendosiereinrichtung

29

fluidic connection

30

Means for coupling / decoupling

31

Means for coupling / decoupling

32

fluidic connection

33

Means for coupling / decoupling

30

Means for coupling / decoupling

34

supply unit

35

medium

F

Fibrous web

VA, VA1, VA2, VA3, VB, VD, VE, VF

step

XE1, XE2

input

YA1, YA2, YA3

manipulated variable

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 10200700801 A1 [0007]

Claims (11)

Method for operating an application device ( 1 ) for applying liquid to pasty application media (A1, An, An-1) in the form of at least one free-falling curtain ( 14 ) on a fibrous web (F) with one, at least one distribution chamber ( 4.1 . 4-n . 4.n-1 ) ( 2 ) and one the order header ( 2 ) associated with the order media supply system ( 9 ); characterized in that in the start-up phase of the application device ( 1 ) and / or immediately after the end of an operating phase and / or after an outline of the fibrous web (F) the application head ( 2 ) is at least partially operated with a different of application medium (A1, An, An-1) fluid, in particular water. A method according to claim 1, characterized in that in the start-up phase of the application device ( 1 ) and / or immediately after the end of an operating phase and / or after an outline of the fibrous web (F) the application head ( 2 ) is completely operated with a fluid different from application medium (A1, An, An-1), in particular water. Method according to claim 1 or 2, characterized in that during operation of the application device ( 1 ) is controlled with a different of application medium (A1, An, An-1) fluid, in particular water at least one of the following, this mode of operation at least indirectly descriptive variables: - Duration of operation with a of application medium (A1, An, An-1 ) different fluid, in particular water; Volume flow of a fluid different from application medium (A1, An, An-1), in particular water to at least one distribution chamber ( 4.1 . 4-n . 4.n-1 ) - time sequence of the admission of the individual distribution chambers ( 4.1 . 4-n . 4.n-1 ) with a different of application medium (A1, An, An-1) fluid, in particular water in the presence of several distribution chambers ( 4.1 . 4-n . 4.n-1 ) - flow velocity. A method according to claim 3, characterized in that the duration of operation with a different of application medium (A1, An, An-1) fluid, in particular water is characterized as a function of one of the following variables: - a predefined time - the event of training a closed free-falling curtain ( 14 ) made of application medium (A1, An, An-1) different fluid, in particular water before impinging on the fibrous web (F) or a collecting device ( 17 ) - the event of the first impact of a closed free-falling curtain ( 14 ) made of application medium (A1, An, An-1) different fluid, in particular water on the fibrous web (F) or a collecting device ( 17 ). Method according to one of claims 1 to 4, characterized in that the supply of the application head ( 2 ) with a different of application medium (A1, An, An-1) fluid, in particular water on a separate the applicator ( 2 ) associated venting / flushing system ( 26 ), wherein during the start-up phase, the fluidic connection between order media supply system ( 9 ) and order header ( 2 ) is interrupted. Method according to one of claims 1 to 4, characterized in that the supply of the application head ( 2 ) with a fluid different from application medium (A1, An, An-1), in particular water during the start-up phase, with at least partial use of the order media supply system ( 9 ), whereby the fluid, in particular water-free, flow paths of the application medium supply system, which is subject to an application of a fluid different from application medium (A1, An, An-1), ( 9 ) of the at least one distribution chamber ( 4.1 . 4-n . 4.n-1 ) are decoupled fluidically. Method according to one of claims 1 to 6, characterized in that the transition between the start-up phase and the operating phase by switching between the application of the application head ( 2 ) with a different of application medium (A1, An, An-1) fluid, in particular water and with application medium (A1, An, An-1) takes place. Method according to one of claims 1 to 7, in an application device ( 1 ) with a job media supply system ( 9 ), comprising individual distribution chambers ( 4.1 . 4-n . 4.n-1 ) and a job medium supply unit ( 10.1 . 10.n . 10.n-1 ) supply strands ( 11.1 . 11.n . 11.n-1 ) for the supply of a coating medium (A1, An, An-1), characterized in that in this at least one with one of the distribution chambers ( 4.1 ) directly coupled first supply line ( 11.1 ) at least temporarily with at least one further other distribution chamber ( 4-n . 4.n-1 ) is fluidically connected, wherein in the start-up phase of the application device ( 1 ) after a standstill or a fault, in particular a tear of the fibrous web (F) and / or immediately after the end of an operating phase or after a demolition components of the order media supply system ( 9 ) for venting / rinsing the application head ( 2 ), wherein the at least one first supply line ( 11.1 ) with a supply unit for one of application medium (A1, At, An-1) different fluid, in particular water can be coupled and the application medium (A1, An, An-1) different fluid, in particular water on the fluidic coupling of the first supply strand ( 11.1 ) with at least one further other distribution chamber ( 4-n . 4.n-1 ) is supplied, wherein at least several of the other distribution chambers ( 4-n . 4.n-1 ) are deaerated and / or rinsed simultaneously or in succession. Method according to claim 8, characterized in that that of the individual distribution chamber ( 4-n . 4.n-1 ) assigned to the application medium (An, An-1) during the start-up phase of the application device ( 1 ) and / or after the end of an operating phase and / or after a demolition in the bypass ( 18.n . 18.n-1 ) to the distribution chamber ( 4-n . 4.n-1 ) and back to the application medium supply unit ( 10.n . 10.n-1 ) of the respective other other supply line ( 11.n . 11.n-1 ) to be led. Applicator device ( 1 ) for applying liquid to pasty application media (A1, An, An-1) in the form of a single-layer or multi-layered free-falling curtain ( 14 ) on a fibrous web (F), comprising a gun ( 2 ) with at least one distribution chamber ( 4.1 . 4-n . 4.n-1 ), each via a feed gap ( 5.1 . 5.n . 5.n-1 ) with a discharge opening ( 6.1 . 6.n . 6.n-1 ) on the order header ( 2 ) and an order media supply system ( 9 ); characterized in that means for at least temporary admission to the applicator head ( 2 ) are provided with a different of application medium (A1, An, An-1) fluid, in particular water. Applicator device ( 1 ) according to claim 10, characterized in that a separate or components of the order media supply system ( 9 ) using venting / flushing system ( 26 ) is provided, and the means for at least temporary admission to the order header ( 2 ) with a different of application medium (A1, An, An-1) fluid, in particular water means ( 30 ) for alternative or simultaneous coupling / decoupling of the venting / flushing system ( 26 ) and the order media supply system ( 9 ) to the individual distribution chamber ( 4.1 . 4-n . 4.n-1 ).

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