DE102008023792A1 - Arrangement for film casting - Google Patents

Abstract

In an arrangement for casting films, extruded plastic material exits a slot die (1) and is quenched on the cooled peripheral surface (6) of a casting roll (2). The resulting film web (8) wraps around the casting roll (2) over a large angular range and is lifted off the casting roll (2) by means of a take-off roll (3). The film web (8) is spaced from the casting roll side surfaces (7). As a result, lateral regions (25) are formed on the casting roll peripheral surface (6), in which polymer dust accumulates. For cleaning, a strip-like guide part (10) with a flexible linear member (11) is arranged in the free region of the peripheral surface (6). The linear member (11) is supplied from a supply reel (13) via a first (14) and a second deflection roller (15) of a take-up reel (17). The rotating casting roll (2) itself pulls the flexible linear member (11) against the guide member (10) due to its circumferential direction (4). This moves in its longitudinal direction (12) and cleans the casting roll peripheral surface (6) of polymer dust, which accumulates particularly in the edge regions (25) of the casting roll (2).

Description

The The invention relates to an arrangement for film casting a slot nozzle, a rotating casting roll and a take-off roll, which counter to the circumferential direction of the rotating casting roll in a short circumferential distance the slot nozzle is arranged, whereby an ongoing Casting free area of the casting roll peripheral surface is given while passing through the remaining long Circumferential distance between slot nozzle and take-off roll remaining larger area of the casting roll peripheral surface is wrapped in the running of the resulting film, according to the preamble of claim 1.

An arrangement of this kind is from the German Patent 12 54 856 known. In this case, an extruded plastic material, for example a molten thermoplastic film-forming polymer, emerges from the slot nozzle in a thin layer with a temperature between about 200 ° C. (polyamide) to 280 ° C. (polyethylene terephthalate, PET) and more, and reaches the cooled one Peripheral surface of the casting roll. In the case of the quenching and cooling process due to the temperature difference, the film web forms on the casting roll peripheral surface and is finally drawn off from the casting roll with a take-off roll. The film web resting on the casting roll circumferential surface wraps around the casting roll corresponding to a circumferential angle of 240 ° to 280 °. Between the slot nozzle and the take-off roll only a small area remains corresponding to a circumferential angle of at most 80 ° to 120 °, which remains free in the current casting operation, so is not wrapped by the film web.

At the Pour the film webs, and especially dry Processes, particles, called oligomers, are formed precipitate on the casting roller as white polymer dust. Especially Of these deposits are the exposed lateral edge areas the casting roll peripheral surface adjacent to the film web affected, which is a distance from the side surfaces of the Maintains casting roll. You leave it at the deposits, so contaminates the film web in their peripheral areas, especially if the width of the film webs produced varies becomes. If necessary, the edge regions of the film webs cut off and disposed of as waste. To a lesser extent but is also the middle region of the casting roll peripheral surface affected by pollution. Removing the polymer dust is an urgent problem when casting the film webs.

Out The operational practice are various suggestions for regular cleaning of the casting roll peripheral surface known. A side blow with compressed air has proved ineffective and even harmful. After another Method was interrupted the casting operation, the casting roll stopped and washed their peripheral surface with water and then rubbed dry. The disadvantage is the interruption of the casting operation and the time-consuming Method of cleaning. Furthermore, it was tried, the free Edge areas of the casting roll peripheral surface in the current Casting operation by means of cleaning wipes or bodies, the so-called pads, to clean. Proved disadvantageous Thereby, no cleaning liquid is used because they are polluted too fast and can not be exchanged can. It is also desirable that the casting roll peripheral surface not only in their peripheral areas, but to clean a total. This is contrary to the fact that the casting roll peripheral surface with its entire width only in the already mentioned small Range corresponding to a circumferential angle of at most 60 ° during operation is open at all and is accessible for cleaning.

Of the Invention is therefore based on the object, an arrangement of the above so-called type in such a way that the casting rolls peripheral surface in running operation can be effectively cleaned, the polluting Particles not only from the casting roll peripheral surface solved, but also effective from the range of the casting roll be removed.

• a) in dem frei bleibenden Bereich der Gießwalzen-Umfangsfläche ist mindestens ein auf dieser aufliegendes bewegliches Reinigungswerkzeug in der Form eines flexiblen Lineargliedes angeordnet;
• b) die Längsrichtung des beweglichen Lineargliedes verläuft quer zu der Umfangs-Laufrichtung der rotierenden Gießwalze;
• c) das flexible Linearglied ist in seiner Längsrichtung beweglich geführt und derart angetrieben, dass es bis über den seitlichen Rand der Gießwalzen-Umfangsfläche hinaus bewegt wird.

This object is achieved in an arrangement according to the preamble of claim 1 according to the invention that according to the characterizing part of claim 1, the following features are provided:

• a) in the remaining free area of the casting roll peripheral surface at least one resting on this movable cleaning tool in the form of a flexible linear member is arranged;
• b) the longitudinal direction of the movable linear member is transverse to the circumferential direction of rotation of the rotating casting roll;
• c) the flexible linear member is movably guided in its longitudinal direction and driven so that it is moved beyond the lateral edge of the casting roll circumferential surface.

According to the invention, at least one cleaning tool is thus provided in the form of a flexible linear member. This thus has the basic shape of a string or a band and is moved transversely to the circumferential direction of rotation of the rotating casting roll on the cylindrical peripheral surface. The term "transverse" does not only mean "strictly vertical", but also does not exclude too large angular deviations from the strictly vertical orientation relative to the circumferential direction with a. Angular deviations of 30 ° on both sides are included in each case.

The flexible linear member required in the direction of the circumferential direction of travel The rotating casting roller has little space and therefore can readily in the not wrapped by the film web, so free area of the casting roll peripheral surface to be built in. It is even the arrangement of several flexible Linear members in a row in the direction of the casting roll peripheral surface possible. With appropriate lateral guidance The flexible linear member can then easily moved on the casting roll peripheral surface when the casting roll rotates; the casting plant does not need to be interrupted to clean the casting roll become. By the flexible linear member on the side Edge of the casting roll circumferential surface moves out not only does it absorb the polluting particles, it transports them they also out of the casting roller area, where they possibly together with the flexible linear member without reaction can be disposed of easily on the cleaning process.

Of the Cleaning operation with the flexible linear member can be continuous or discontinuously, in any case even during of the casting operation. For example, the flexible linear member during of the casting operation gradually at intervals with in between lying pauses are moved. Or it will be once during the casting company for a certain longer Time span continuously moved. Furthermore, an automatic Switching on the cleaning operation depending on the metrological detection of the particle seizure possible.

advantageous Further developments of the arrangement according to the invention are listed in the dependent claims.

In In concrete form, the flexible linear member may be a band, a cable, Be a rope, a string or a chain, being just the cleaning effecting area consists of a lint-free material. The The rule "lint-free" means that the cleaning material do not leave any traces or residue behind should.

Advantageous It is when the cleaning effect area of a microfiber material consists. In that case, the flexible linear member itself is the simplest made entirely of microfibre material.

It It is also possible that the flexible linear member is a flexible Brush belt with a suction is. In this case is However, make sure that this brush band no bristles loses. Advantageously, such a flexible Brush tape to be a precursor to a cleaning, at the second stage, a flexible linear member made of a microfiber material is provided.

The flexible linear links can be in the dry state or in conjunction with a liquid detergent for Use come.

The greatest possible prevention against impurities the cleaning process itself is given when a supply and a take-up reel are provided and the flexible linear member it has a finite length, it being during the cleaning process unwound from the supply spool and wound onto the take-up spool becomes. In this training, the recorded polluting particles together with the flexible linear member outside the casting roll disposed of, so no harmful reaction on the cleaning process is possible.

in principle However, it is also possible that the flexible linear member has a closed continuous shape and is continuously in circulation the casting roll circumferential surface out is, wherein on the way back from the casting roll peripheral surface a Cleaning station is interposed. In this training can the flexible linear member over a longer Stay in use throughout the time. Prerequisite for a flawless functioning is, however, that the intermediate Cleaning station works perfectly.

If in the inventive arrangement, the flexible Linear member in conjunction with a liquid detergent to be used, so there is a first option for applying the cleaning liquid therein that in Infeed of the flexible linear member to the casting roll peripheral surface a dip tank with a cleaning fluid is provided, in which the flexible linear member with the cleaning liquid is soaked. This type of execution has the Advantage of a relatively simple Construction; but it must be ensured that the flexible linear member is not in excess with the cleaning liquid is soaked.

Another possibility for applying the cleaning liquid is that in the circumferential direction of rotation of the rotating casting roll in front of the flexible linear member and extending parallel to this a manifold is arranged, which emits a liquid detergent to the casting roll peripheral surface and the flexible linear member. There is a wide choice for the detergent itself. Preference is given to water, alcohol or a mixture of the two. From the manifold, the Reini supply liquid either to the casting roll peripheral surface or to the flexible linear member and at the same time to both. This second possibility for applying a cleaning agent has the advantage that the amount of cleaning agent to be applied can be kept smaller and therefore the subsequent drying is easier. Possible is an embodiment with a series of nozzles on a manifold, the punctiform and adjustable deliver small amounts of cleaning fluid.

If Such a manifold with the finely metered delivery of a Cleaning agent is provided, it may be appropriate be, the flexible linear member in the circumferential direction of the rotating casting roll downstream of an air knife. With this Then a drying air flow on the remaining area promoted the casting roll peripheral surface.

For the flexible linear member, the lateral guidance is important because it is on the moving casting roll peripheral surface must be effective cleaning. Appropriately is a Guide on a stationary strip-like guide part, on which the flexible linear member rests laterally. The plant is coming in that the flexible linear member of the casting roll circumferential surface is taken by friction in the casting operation.

The strip-like guide part can be an open longitudinal groove for receiving the flexible linear member, wherein the profile the longitudinal groove is shaped such that the flexible linear member additionally a force component for abutment with the casting roll peripheral surface receives.

A simple embodiment of the invention Arrangement may consist in that a single flexible linear member whose working area extends over the entire axial width of the casting roll peripheral surface extends. However, the flexible linear member already takes up in the first edge area polluting particles, which can then disturb if also the particles in the opposite edge area removed or taken away.

A Therefore, improved design is that two flexible Linear members arranged with opposite direction of movement are, wherein the cleaning movement on the casting roll peripheral surface done from the inside out. The workspaces of the two flexible linear members in the axial direction of the casting roll peripheral surface can connect to each other or yourself partially overlap. The purpose of this training is in that the flexible linear members starting from the less soiled center area of the casting roll peripheral surface move outward so that in the more polluted Edge area of the casting roll peripheral surface the flexible Linear member is even more receptive.

In further development of this idea can be the work areas the two flexible linear members also be separated from each other and in each case only one of the two axial edge regions the casting roll circumferential surface extend. The border areas, over which extends the working area of each linear member, are slightly wider than those not covered by the film web lateral areas. In this case will be on a special cleaning the central region of the casting roll circumferential surface waived.

After all it is also possible that in the circumferential direction of the Casting roller peripheral surface successively two flexible Linear members are arranged, the first of which is dry Condition and the second in conjunction with a liquid Cleaning agent works. This double arrangement is possible when the working width of a flexible linear member over the entire axial width of the casting roll or only over a subarea is enough.

A further advantageous embodiment of the invention Arrangement is directed to serving for cleaning Components are grouped into a separate module, the lifted as a whole from the casting roll peripheral surface can be.

To the components of such an assembly include the at least one flexible linear member and the corresponding strip-like Guide part, the supply and take-up reel with motor drive and pulleys, possibly a dip tank or manifold for the cleaning fluid and an air knife, all this together with the corresponding connecting parts and Connecting cables.

A Such assembly can be arranged on a single carrier be, the z. B. by means of a servomotor or a hydraulic Device radially to the casting roll peripheral surface linearly movable or pivotable. At a such training, the assembly with the cleaning serving Components in the fastest way from the casting roll peripheral surface be removed if a malfunction of the casting operation occurs, for example, by forming lumps from the film web become or cracks arise. This avoids that sensitive and very expensive casting roll damaged in case of failure becomes.

The invention will be explained in more detail with reference to embodiments which are illustrated in the figures. In the figures, the fol presented below:

1 is the spatial representation of an inventive arrangement for film casting, in which the casting roll surface is cleaned with a flexible linear member.

2 shows one too 1 belonging side view.

3 is the spatial representation of one of 1 corresponding arrangement according to the invention, are additionally attached to a manifold for a cleaning fluid and an air knife.

4 represents in a 1 and 3 corresponding representation of a modified embodiment of the inventive arrangement.

5 shows a further modification to the embodiment according to 4 ,

6a is one of the 5 corresponding representation of an arrangement in which an additional immersion bath container is provided with a cleaning liquid.

6b shows at the location of Tauchbadbehälters a manifold with otherwise identical representation.

7 shows a particular embodiment of the arrangement according to the invention, in which the functional parts used for cleaning the casting roll surface are combined to form a device which can be lifted as a whole from the casting roll.

In 1 an arrangement for film casting is shown, which with a slot nozzle 1 , a casting roll 2 and a take-off roll 3 Is provided. During operation, the casting roller rotates 2 with a circumferential direction 4 according to the casting roll rotation direction 5 ( 2 ) around its central axis. In this case, a thin layer of extruded plastic material emerges from the slot nozzle 1 from and reaches the casting roll peripheral surface 6 , While the extruded plastic material may have a temperature of 230 ° C and more depending on its composition as it exits the slot die, the casting roll is 2 cooled from the inside, so that the casting roll peripheral surface 6 during operation has a surface temperature of about 45 ° C (?).

The layer of the extruded plastic material therefore undergoes a quenching process and becomes the film web 8th converted onto the moving casting roll peripheral surface 6 rests and is taken by this, until finally by means of the take-off roller 3 from the casting roll peripheral surface 6 lifted and as discontinued film web 8th in the withdrawal direction 9 their further processing is supplied.

The 2 points in the direction of the side surface 7 the casting roll 1 in that the casting roll peripheral surface 6 by far the largest part of its scope of the film web 8th is entwined. In the illustrated embodiment, the vacant area corresponds to the casting roll peripheral surface 6 that of the film web 8th is not wrapped, a circumferential angle α of the casting roll of about 45 °, while that of the film web 8th looped area caused by the long circumferential distance between slot nozzle 1 and take-off roll 3 is given, corresponds to a circumferential angle β of 315 °. The features of the inventive arrangement described hitherto are customary in the art. It is used to cast flat films in a dry thermal process. This inevitably results in particles (oligomers), which can be found as dust or powder in the casting roll 1 drop. In particular, of these are the remaining free lateral areas 25 the casting roll 1 not affected by the film web 8th are covered. To a lesser extent, however, also contaminates the through the film web 8th covered area.

To remove the particles is therefore in accordance with the 1 to 3 a movable cleaning tool in the form of a flexible linear member 11 intended. It is in the of the film web 8th not wrapped, so in operation free area of the casting rolls peripheral surface 6 arranged, which is defined by the circumferential angle α. The flexible linear member 11 lies with a certain bearing force on the casting roll peripheral surface 6 on and is in its longitudinal direction 12 movably powered. Its longitudinal direction 12 is thus at the same time its direction of movement. The longitudinal and direction of movement 12 The flexible linear member extends transversely to the circumferential direction 4 the casting roll 2 , The term "transverse" should not only mean "strictly vertical", but also can not be too large angle deviations from the strictly vertical orientation relative to the circumferential direction 4 include. Angular deviations of 30 ° on both sides are included in each case.

The flexible linear member 11 can be a band, a cable, a rope, a string or a chain. In its cleaning effecting area, with which the flexible linear member 11 on the casting roll peripheral surface 6 rests, consists of the flexible linear member 11 in any case made of a lint-free material. Preferred is a microfiber material that is optimally adapted to the purpose of receiving and entraining particles. That in the figures of Embodiments shown flexible linear member 11 should consist entirely of a microfiber material.

The flexible linear member 11 becomes in its longitudinal and moving direction 12 driven to a linear motion. According to the embodiments of the 1 and 3 passes over the flexible linear member 11 the entire width of the casting roll 2 from the right edge to beyond the left edge. It absorbs the polluting particles and carries them away from the casting roll peripheral surface 6 ,

The linear alignment of the longitudinal and direction of movement 12 comes about by the flexible linear link 11 on a strip-like guide part 10 is guided. This is stationary over the casting roll peripheral surface 6 attached and in the direction of the casting roll peripheral surface 6 back and opposite to their direction 4 with an outwardly open longitudinal groove 23 provided, cf. the detail A too 2 , The longitudinal groove 23 has a cross-section that decreases from its opening to its end. In the illustrated embodiment, the cross section is curved in the manner of a circular arc or an ellipse. This design of the longitudinal groove causes the fle xible linear member during operation 11 from the circumferential casting roll peripheral surface 6 in the circumferential direction 4 taken along and in longitudinal groove 23 is pulled into it. It is thus oriented in the longitudinal direction of the strip-like guide part 10 out. Because the contour of the cross section of the longitudinal groove 23 curved, receives the flexible linear member 11 at the same time a force component, it against the casting roll peripheral surface 6 suppressed.

After the 1 and 3 are flexible linear links 11 of finite length provided. In both cases, there is the clean, in its initial state located flexible linear member 11 on a supply spool 13 ; from there it will be over a first pulley 14 across the casting roll peripheral surface 6 and from there via a second pulley 15 to a take-up reel 17 guided. When the entire stock length of the flexible linear member 11 along with the entrained particles on the take-up spool 17 are wound up, both coils are 13 and 17 renewed. The motor drive of such coils is customary and need not be discussed particularly.

The cleaning operation with the flexible linear member 11 can be continuous or discontinuous, in any case, even during the casting operation. For example, the flexible linear member 11 during the casting operation are moved stepwise at intervals with intervening pauses. Or it is continuously moved once during the casting operation for a certain length of time. Furthermore, an automatic activation of the cleaning operation in dependence on the metrological detection of the particle seizure is possible.

In the arrangement according to the 1 Dry cleaning is performed by the flexible linear member 11 , After the in 3 embodiment shown is the flexible linear member 11 a fixedly mounted distribution pipe 19 upstream. It is used to deliver a liquid detergent, for which there is a large choice. Preference is given to water, alcohol or a mixture of the two. If the polluting particles consist of polymer dust, namely condensed oligomers, their adhesion to the casting roll peripheral surface may 6 already be lifted by means of water. The condensed oligomers do not dissolve with the water, but are merely purified with water.

From the manifold 19 the cleaning liquid should either to the casting roll peripheral surface 6 or to the flexible linear member 11 or simultaneously to both. The delivery should be finely dosed. For this purpose, a number of nozzles on the manifold 19 be attached, the punctiform and adjustable deliver small amounts of cleaning fluid.

In 3 is in the circumferential direction 4 the casting roll peripheral surface 6 behind the strip-like guide part 10 with the flexible linear member 11 an air knife 20 arranged, which a drying air flow on the remaining free area of the casting roll peripheral surface 6 promotes. In this way, a stage of wet cleaning is followed by a stage of dry cleaning.

Another possibility for a two-stage arrangement may be that first a mechanical rough cleaning takes place by using as a flexible linear member 11 a flexible brush belt with suction or a so-called V-belt brush on the casting roll peripheral surface 6 runs and that the brush belt a flexible linear member 11 is followed by a microfiber material.

In the embodiments according to the 4 to 6b has the arrangement of two pairs of cooperating flexible linear members 21a , Federation 22a , b another meaning. The polluting particles, usually a white polymer dust, are mainly found on the free areas 25 the casting roll 2 down, not from the film web 8th are covered. According to 4 are therefore in the vacant area of the casting roll peripheral surface 6 two flexible linear links 11 arranged. Your movements supply direction 12a , b is directed in opposite directions and with their cleaning effective areas from inside to outside. The working areas of the two flexible linear links 21a , b cover each other in the longitudinal and direction of movement 12a , b or at least connect to each other. Only because of the space requirement are the two flexible linear members 21a , b also in the circumferential direction 4 offset from each other. Drive and guidance of the two flexible linear links 21a , B are basically the same design as in the embodiments described above, so that the same reference numerals are entered as previously for parts remaining unchanged. In addition, for each of the two flexible linear links 21a , b only a third pulley 16 required.

The advantage of the arrangement according to 4 is that cleaning in the heavily soiled lateral areas 25 always with a flexible linear member 21a , b, which has taken up little dirt and is therefore particularly receptive. In the execution according to the 1 and 3 on the other hand, the particles are from the first cleaned lateral area 25 already on the flexible linear member 11 if this is the opposite side area 25 reached.

A further embodiment of the arrangement according to the invention is in the 5 shown and is that the working areas of the two flexible linear members 22a , b no longer cover or touch each other. Each of the two moving in opposite directions from inside to outside flexible linear members 22a , b merely sweeps over an edge region of the casting roll peripheral surface 6 , Each lateral edge area of one of the flexible linear links 22a , b is swept, has a width B which is greater than the width b of the free lateral area 25 that of the film web 8th is not covered. In this way it is ensured that the edges of the film web can not pollute. In the execution according to the 5 can the two flexible linear links 22a , b with matching longitudinal direction 12a , b are arranged. As a result, the space required despite the installation of two flexible linear links 22a , b decreased again. The direction of travel of the flexible linear links 22a However, b is opposite.

In the variant according to the 6a is in the inlet of the linear member 22a to the casting roll peripheral surface 6 a dip tank 18 with a cleaning fluid 24 arranged. The flexible linear member 22a goes through the dipping bath and gets with the cleaning liquid 24 soaked. Also in the arrangements according to the 4 to 6 it is possible stations of wet and dry cleaning in the circumferential direction 4 the casting roll peripheral surface 6 to install one after the other. According to 6b is in the place of the dipping bath container 18 a manifold 19 ,

7 shows in a more detailed embodiment than heretofore an arrangement according to the invention, in which the components serving for the cleaning are combined into a separate assembly which as a whole of the casting roll peripheral surface 6 can be lifted. The assembly can therefore move in the fastest way from the casting roll peripheral surface 6 be removed if necessary. This may be necessary in case of disturbances of the casting operation, for example if of the film web 8th Lumps are formed or cracks arise. It is then ensured that the sensitive and very expensive casting roll 2 is not damaged in such malfunctions.

1

slot

2

casting roll

3

off roll

4

Circumferential direction

5

direction of rotation

6

Casting-roll circumferential surface

7

Casting-side surface

8th

sheet

9

withdrawal direction the film web

10

strip-like guide part

11

flexible linear element

12 12a, b

Along- and direction of movement

13

supply spool

14

first idler pulley

15

second idler pulley

16

third idler pulley

17

up reel

18

Tauchbadbehälter

19

manifold

20

air knife

21a, b

flexible linear element

22a, b

flexible linear element

23

longitudinal groove

24

cleaning fluid

25

free permanent lateral area

b

width of the free lateral area

B

axial edge area (working area) according to 5 and 6

α, β

circumferential angle

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 1254856 [0002]

Claims (21)

Arrangement for film casting with a slot nozzle, a rotating casting roll and a take-off roll, which is arranged opposite to the circumferential direction of rotation of the rotating casting roll in a short circumferential distance in front of the slot nozzle, whereby a free-running in casting operation area of the casting roll peripheral surface is given while the larger area of the casting roll peripheral surface remaining through the remaining long circumferential distance between the slot die and the take-off roll is looped during operation by the resulting film, characterized in that the following features are provided: a) in the free area of the casting roll Peripheral surface ( 6 ) is at least one resting on this movable cleaning tool in the form of a flexible linear member ( 11 ; 21a , b; 22a , b) arranged; b) the longitudinal direction ( 12 ) of the movable linear member ( 11 ; 21a, b ; 22a , b) extends transversely to the circumferential direction ( 4 ) of the rotating casting roll ( 2 ); c) the flexible linear member ( 11 ; 21a , b; 22a , b) is in its longitudinal direction ( 12 ) and driven such that it extends beyond the lateral edge of the casting roll peripheral surface ( 6 ) is moved out. Arrangement according to claim 1, characterized in that the flexible linear member ( 11 ; 21a , b; 22a , b) is a tape, a cable, a rope, a string or a chain and that at least its cleaning causing area consists of a lint-free material. Arrangement according to claim 1 or 2, characterized in that the flexible linear member ( 11 ; 21a , b; 22a , b) consists of a microfiber material. Arrangement according to claim 1 or 2, characterized in that the flexible linear member ( 11 ; 21a , b; 22a , b) consists of a flexible brush belt with suction. Arrangement according to one of claims 1 to 4, characterized in that the flexible linear member ( 11 ; 21a , b) is used in the dry state. Arrangement according to one of claims 1 to 4, characterized in that the flexible linear member ( 11 ; 21a , b; 22a , b) is used in conjunction with a liquid detergent. Arrangement according to one of claims 1 to 6, characterized in that a supply reel ( 13 ) and a take-up spool ( 17 ) are provided and the flexible linear member ( 11 ; 21a , b; 22a , b) has a finite length, wherein it is in the cleaning process of the supply reel ( 13 ) and on the take-up spool ( 17 ) is wound up. Arrangement according to one of claims 1 to 6, characterized in that the flexible linear member is a closed Endless shape has and continuously circulated over the Casting roller peripheral surface is guided, on the way back from the casting roll peripheral surface a cleaning station is interposed. Arrangement according to one of claims 6 to 8, characterized in that in the inlet of the flexible linear member ( 22a , b) to the casting roll peripheral surface ( 6 ) a dip tank ( 18 ) is provided with a cleaning liquid, in which the flexible linear member ( 11 ; 21a , b; 22a , b) is impregnated with the cleaning liquid. Arrangement according to one of claims 6 to 9, characterized in that in the circumferential direction ( 4 ) of the rotating casting roll ( 2 ) in front of the flexible linear member ( 11 ) and parallel to this running a manifold ( 19 ) is arranged, the a liquid cleaning agent to the casting roll peripheral surface ( 6 ) and to the flexible linear member ( 11 ; 21a , b; 22a , b) surrenders. Arrangement according to one of claims 6 to 9, characterized in that the flexible linear member ( 11 ) in the circumferential direction ( 4 ) of the rotating casting roll ( 2 ) an air knife ( 20 ), which directs a drying air flow onto the remaining area of the casting roll circumferential surface (FIG. 6 ) promotes. Arrangement according to claim 10 or 11, characterized in that the distributor pipe ( 19 ) and the air knife ( 20 ) over the entire working width of the flexible linear member ( 11 ). Arrangement according to one of claims 1 to 12, characterized in that the flexible linear member ( 11 ; 21a , b; 22a , b) in its longitudinal direction on a stationary strip-like guide part ( 10 ), wherein its lateral abutment on the guide part ( 10 ) is due to the fact that it depends on the moving casting-roll peripheral surface ( 6 ) is taken by friction. Arrangement according to claim 13, characterized in that the strip-like guide part ( 10 ) an open longitudinal groove ( 23 ) for receiving the flexible linear member ( 11 ; 21a , b; 22a , b). Arrangement according to claim 14, characterized in that the longitudinal groove ( 23 ) contrary to Circumferential direction ( 4 ) of the casting roll peripheral surface ( 6 ) is open towards this and shaped such that the flexible linear member ( 11 ; 21a , b; 22a , b) additionally also a force component for engagement with the casting roll peripheral surface ( 6 ) receives. Arrangement according to one of claims 1 to 15, characterized in that a single flexible linear member ( 11 ) is provided, whose working area extends over the entire axial width of the casting roll peripheral surface ( 6 ). Arrangement according to one of claims 1 to 15, characterized in that two flexible linear members ( 21a , b; 22a , b) are arranged in opposite directions of movement, wherein the cleaning movement on the casting roll peripheral surface ( 6 ) takes place from the inside to the outside. Arrangement according to claim 16, characterized in that the working areas of the two flexible linear members ( 21a , b) in the axial direction of the casting roll peripheral surface ( 6 ) connect to each other or overlap partially. Arrangement according to claim 17, characterized in that the working areas of the two flexible linear members ( 22a , b) are separated from each other and each only over one of the two axial edge regions of the casting roll peripheral surface ( 6 ). Arrangement according to one of claims 1 to 19, characterized in that in the circumferential direction ( 4 ) of the casting roll peripheral surface ( 6 ) successively two flexible linear members ( 11 ) are arranged, of which the first operates in the dry state and the second in conjunction with a liquid detergent. Arrangement for film casting according to one of Claims 1 to 20, characterized in that the components used for cleaning are combined to form a separate assembly which as a whole is separated from the casting-roll peripheral surface ( 6 ) can be lifted.