WO2013113920A1

WO2013113920A1 - Coating system for flexible webs

Info

Publication number: WO2013113920A1
Application number: PCT/EP2013/052133
Authority: WO
Inventors: Ralph Pagendarm
Original assignee: Olbrich Gmbh
Priority date: 2012-02-02
Filing date: 2013-02-04
Publication date: 2013-08-08
Also published as: DE102012001956A1; DE202012012709U1; KR20140127140A

Abstract

A coating device for flexible webs (5) is shown and described having an applicator roll (13) which is driven in a rotational direction and is arranged adjacently to a transport path (7) of the flexible web (5), in order to transfer coating material (31) onto the flexible web (5) by way of contact, having elements (23, 53), by way of which the applicator roll (13) can be wetted with coating material (18) on a circumferential section (24), and having a wiping blade (25) which extends over the length of the applicator roll (13), bears against a bearing line (26) in a contact region (27) tangentially along said bearing line (26), and has depressions (49) on the side (41) which points towards the applicator roll (13), which depressions (49) run perpendicularly or at an angle of less than 90° with respect to the longitudinal axis (21) of the applicator roll (13). The coating device is characterized in that the wiping blade (25) is arranged in such a way that the bearing line (26) of the wiping blade (27) is spaced apart from the circumferential section (24) in the rotational direction (15).

Description

Coating system for flexible webs

The present invention relates to a Beschichtungseinrich- processing for flexible webs having a driven in a rotational direction of the application roller which is arranged adjacent to a transport path of the flexible web to contact transferred coating material onto the flexible web, having elemene ^¬ th with which the applicator roll can be wetted with coating material at a peripheral portion and with a doctor blade extending over the length of the applicator roll tangent to a contact region tangentially along a contact line and having depressions on the side facing the applicator roll which are perpendicular or under an angle smaller than 90 ° to the longitudinal axis of the application ^¬ roller run.

By means of coating devices, a coating material is applied to a flexible web, wherein the term "flexible web" in the sense of the present invention i.a. Films, films or paper webs fall, but the invention is not limited to the application thereto. The flexible web is first passed through a roller arrangement to the coating device and, after coating, subjected to a post-treatment such as drying.

First, coating devices are known in which the coating material is sprayed onto it with the aid of a nozzle extending across the width of the web, and the thickness or amount of the coating is adjusted by means of a wire bar. It is however disadvantageous that the web is in the area of the nozzle under tension and the distance between the nozzle and the web varies above the injection line over the working width, so that the amount varies up ^¬ attached to the coating material. Moreover, due to the high volume of coating material to air bubbles in the coating come.

From the state of the art it is also known to ^apply the coating material by means of a counter-rotating or co-rotating applicator ^roll by contact with the flexible web. In this case a rigid doctor blade or a rotating roll is arranged at a predetermined distance from the contract ^¬ roller, wherein the gap between the knife and on ^¬ carrier roll or between rotating roll and applicator roll defines the amount of coating material is applied to the contract ^¬ roller , The disadvantage here is that the deflection of the applicator roll must be taken into account for the production of precise coatings with a thickness in the micrometer range. This usually results in the width of the nip varying over the length of the roll, and thus also the amount of coating material applied to the applicator roll and then to the web.

Alternatively, it is also known to form the rotationally driven on ^¬ support roll as a so-called gravure roll which is provided with extending in the circumferential direction or inclined wells. The engraved roller runs in the rotational direction first by a mass template with the Beschichtungsma ^¬ TERIAL. Elastic doctor blade are located at the extending parallel to the longitudinal axis of the roll edges of the mass template against the roller to ERS excess material from the roll ^¬ strip. Since the volume can be laterally and sealed by the doctor blade in the longitudinal direction of the engraved roll in the mass template, it is processing device also possible with such a coating, the coating material in the mass template by means of a pump with pressure to beaufschla ^¬ gene and as the coating amount to influence. In a coating device with a gravure roll, however, there are some disadvantages. First, the amount of coating material that is transferred to the web, in addition to the rotational speed of the roller is determined by the engraving of the roller. Thus, if the amount of coating applied to the web should be changed materiality ^¬ Lich in such a device, the engraved roll must be replaced, which is extremely expensive. Furthermore, in order for the coating of the web to take place uniformly, the gravure roll must have a comparatively large diameter, which leads to a complicated construction of the coating device due to the associated high weight. Finally, it is extremely expensive to clean a gravure roll when changing the coating material.

In addition, there is the problem that the Abstreifmes ^¬ ser must rest over the entire length of a gravure roll with a sufficient pressure at this, so that the excess coating material is removed from the gravure roll. Since the gravure roll but due to their necessarily large diameter and the associated weight has a certain deflection, the pressure exerted on the doctor blade pressure must be sufficiently large, so that it rests over the ge ^¬ entire length of roller. Due to the friction with the doctor blade, this pressure leads to considerable wear on the engraved roller.

From DE 25 54 761, from which the present invention proceeds, ^¬ a coating device is known in which a mass template is provided for the coating material, which is arranged laterally on the applicator roll and which extends over the length of the roller. The mass template is compared with the roller sealed by an elastic blade, which abuts on the roller, with grooves which are provided in the roll to the white ^¬ send side of the knife, the amount of loading coating material pretend that is up to the application roller ^¬ done. In this structure, the problem arises that the knife with the grooves provided therein on the one hand determines the amount of coating material which is applied to the Auftragswal ^¬ ze. On the other hand, the knife must Massevor ^¬ position also against the application roller seal, which in turn requires that the knife is pressed with a sufficiently large force against the application roller. This force or the pressure associated therewith, which are required due to the necessary ^{sealing off} , lead here to considerable wear on the blade and / or on the applicator roll.

In addition, the engraved grooves are schiffchenförmig running with wedge-shaped groove cross-section, which has the disadvantage that the free cross section on the investment line, which results between the engraved knife and the roll surface, lageab ^¬ pendent and changes in Oszilierung the free cross section with the result that the coating weight would Variegated ^¬ Lich.

Starting from the prior art, it is therefore an object of the present invention to provide a coating device in which the wear on the applicator roll and the doctor blade is minimized.

This object is achieved in that the doctor blade is arranged such that the contact line of Abstreifmes ^¬ sers is spaced in the direction of rotation of the peripheral portion.

In the device according to the invention, the amount of material applied to the flexible web is determined by the dimensions of the depressions in the doctor blade. The doctor blade therefore has a pure dosing function. In this case, application roller can be wetted over its length by means of a nozzle evenly with coating material, wherein the peripheral portion in which the coating material is sprayed onto the applicator roll, is spaced from the investment line of Ab ^¬ grader. In contrast to the direct spraying on the web, the distance does not vary here. By using a nozzle, with which the coating material is applied to the applicator roll instead of a laterally arranged mass template for the coating material ent ^¬ falls the need that the anlie ^¬ on the applicator roll ing blade in addition to the dosing must also have a sealing effect. This simplifies the construction and it ^¬ enables it, the doctor blade with the minimum pressure as is necessary for dosing, to press on the applicator roll, resulting in the lowest possible wear and tear.

In addition, the doctor blade can be supported so that it is adjustable perpendicular to the longitudinal axis of the applicator roll and in particular can be moved back and forth to the remaining wear of the Abstreifmessers, which results from the contact thereof on the line of contact with the Auftragswal ^¬ ze on share the entire surface with the recesses to ver ^¬. Such oscillating movement would not mög ^¬ exist if the doctor blade would have a sealing function because then the oscillation would create a change in the forces acting between roller and doctor blade pressure and thus the sealing ^¬ effective. In addition, the position of the sealing line changes with the oscillation, so as not sealing effect would it ^¬ rich.

Alternatively, it is also possible that no nozzle is used, but the application roller can be wetted by means of a trough-shaped mass template at a peripheral portion with Beschich ^¬ tion material, which can be filled with coating material and in which the applicator roll from above in stretches. The level in the mass master is so high that the applicator roll runs through the coating material and thus first reaches the applicator roll. But even in this case takes the downstream and from the peripheral portion, in which the roller comes in contact with coating material, spaced arranged Abstreifmesser only a dosing ^¬ function and does not have pressed against the applicator roll ^¬ who, so it is not too high Wear comes.

In a preferred embodiment, the doctor blade a parallel to the longitudinal axis of the applicator roller erstre ^¬-bridging continuous web, which is provided on the side facing the applicator roller side of the doctor blade, wherein the engraving or the recesses extend on both sides of the web away from , With such a structure, it is possible to sequentially use the doctor blade in two orientations in which the recesses face the applicator roll, respectively. The remaining area between the engraved surfaces can be used to designate the doctor blade with the type of engraving, so that incorrect operation is excluded. In particular, both sides of the doctor blade can be provided with such a web and with ^{Vertiefun ¬} gene, wherein the webs extend on both sides of the Abstreifmessers parallel to the longitudinal axis of the applicator roll and the recesses extend on both sides of the Abstreifmessers on both sides away from the web. This design allows the doctor blade to be used in four different orientations, further extending the life of the doctor blade.

More preferably, the recesses are designed so that the depth of the depressions or engraved lines between 0 and 40 ym, preferably, be contributes between 10 and 20 ym ym ^¬. The distance of the engraving lines is chosen so that the desired amount of coating material is applied to the Auftragswal ^¬ ze.

Preferably, the depressions of the Abstreifmessers are also carried out over its length, in particular in the field of Oszilierung, with a constant cross-section, so that the free cross section on the investment line, which lies between the gra ^¬ fourth doctor blade, which bears tangentially on the roller, and the roll surface results, is independent of location, ie the free cross section does not change at Oszilierung ^¬

Furthermore, it is preferred if the depressions or engraving lines are executed at an angle, preferably between 30 ° and 90 ° and particularly preferably between 60 ° and 80 °, inclined to the longitudinal axis of the applicator roll. This has the advantage that when the doctor blade relative to the applicator roll oszil ^¬ perpendicular to the longitudinal axis, the points on the circumference of the applicator roller, the wells are axially displaced, whereby the wear on the roller evenly over the length thereof he follows. Consequently, there is no formation of circumferentially extending lines on the roll surface which would render the roll unusable, because with such a pronounced roll surface, no uniform coating of the web would be achieved. Furthermore, the wear on the knife from ^¬ roaming occurs not only along a line, but rather is distributed evenly over a surface.

Preferably, the doctor blade is releasably secured in a clamping device, wherein the doctor blade extends from the clamping device to the contact region. In this case, the clamping device can either be arranged such that the direction of rotation of the applicator roll points in the contact region to the clamping device or the direction of rotation of the Application roller in the contact area of the clamping device points away. It is thus possible that the doctor blade extends parallel to the direction of rotation of the applicator roll away from the clamping device or the applicator roll rotates such that the peripheral surface moves in the contact region towards the clamping device.

Preferably, the clamping device has a first and a second clamping jaw, whose mutually facing contact surfaces extend parallel to a clamping plane, the Abstreifmes ^¬ ser is disposed between the jaws and extends in the clamping plane and wherein the first jaw abuts the side of the Abstreifmessers, the is applied to the applicator roll. In particular, the distance between the contact surfaces of the first and the second clamping jaw may be greater than the thickness of the scraper blade ^¬ , wherein the first or the second jaw or both jaws have an elastic retaining element which is attached to the contact surface.

With such a construction of the clamping device, the doctor blade can be pushed between the jaws, without the need for additional fixing, since the scraper ^¬ knife is already held by the holding element in position. Furthermore, by the play for the doctor blade or the distance between the jaws, which is greater than the thickness of the doctor blade, it is achieved that the force required for setting on the roll surface for metering is significantly reduced. This is due to the fact that unlike the situation where the doctor blade is firmly clamped between two jaws, the stripping ^¬ deformed knife over a greater length. With such a clamping lower forces are required to press with little force, the doctor blade completely on the surface of the applicator roll to a lowest possible To have wear on the surfaces of the doctor blade and the order ^¬ roller.

In order to adjust the lowest possible contact force, the clamping device in a preferred manner on an elastic support member which abuts adjacent to the contact region on the side facing away from the applicator roll side of Abstreifmes ^¬ sers at this. This support element serves to support the doctor blade in the contact region on the side facing away from the applicator roll side of the doctor blade and to apply egg ^¬ ner force.

Hereinafter, the present invention will be described with reference to a le ^¬ diglich preferred embodiments displayed drawing, in which

Fig. 1 is a cross-sectional view of a first game Ausführungsbei ^¬ a Beschichtungseinrich- tung invention shows

FIG. 2 is a plan view of the doctor blade included in the first embodiment of FIG. 1; FIG.

3 shows the clamping device in the first embodiment of FIG. 1 in an enlarged form,

Fig. 4 shows the area of contact between the doctor blade and the application roller in the first embodiment on an enlarged ^¬ ßerter form,

5 shows a cross-sectional view of a second exemplary embodiment of a coating ^{device according} to the invention, FIG. Fig. 6 shows the contact area between the doctor blade and the application roller in the second embodiment on an enlarged ^¬ ßerter form,

7 shows a cross-sectional view of a third exemplary embodiment of a coating ^{device according} to the invention, and FIG

Fig. 8 shows the contact area between the doctor blade and the application roller in the third embodiment on an enlarged ^¬ ßerter form.

Fig. 1 shows a first embodiment of a fiction, ^¬ proper coating device in cross-section, wherein, in this preferred embodiment, as exemplary embodiments in the other from ^¬ a first and a second guide ^¬ roller 1 3 are provided in a common horizontal plane are arranged. The guide rollers 1, 3 are mounted so that they convey a flexible web 5 along a Trans ^¬ portweges 7, which extends between the first and the second guide roller 1, 3, in a transport direction, which is indicated by the arrows 9, 11. At this time, the flexible web 5 moves from the first guide roller 1 to the second guide roller 3.

Between the guide rollers 1, 3 and below the range defined in this case by the profile of the flexible web 5 between the guide rollers 1, 3 transport path 7 an up ^¬ support roller 13 is arranged so that the highest point of the environmental fangs of the application roller 13 above the lowest point of the peripheral surfaces of the guide rollers 1, 3 is located. Then, when the upwardly facing peripheral portion of the applicator roll 13 abuts against the flexible web 5, the web 5 is not ent ^¬ long a straight line between the guide rollers 1, 3, but follows a curved path, as well as Fig. 1 to can be found. The applicator roll 13 has a cured upper ^¬ surface with a predetermined roughness which is chosen so that the application roller can be well wetted material including a Beschichtungsma-. 13

While in the embodiments described here, the transport path 7 of the flexible web 5 between two Führungswal ^¬ zen 1, 3, it is also conceivable that a counter-pressure roller is used, for example, is arranged above the order ^¬ tragic roller, so that the transport of the flexible ^¬ len web along a portion of the circumference of the platen roller extends. In any case, the applicator roll 13 is arranged adjacent to the transport path 7 of the flexible web 5, that a peripheral portion of the applicator roll 13 abuts against the flexible web 5.

The application roller 13 is in the illustrated Ausführungsbei ^¬ play in such a way in a rotational direction 15 driven so that the voltage applied to the flexible web 5 to the peripheral portion ent ^¬ moves against the transport direction 11 of the flexible sheet. 5 But it is also possible that the peripheral speed of the task roller ^¬ 13 is parallel to the direction of movement of the flexible web 5 and only the speeds differ, so that it comes to a relative movement between the flexible web 5 and circumference of the applicator roller 13, which basically for the operation is sufficient.

Below the applicator roll 13 is a collecting trough 17 angeord ^¬ net, which is intended to receive from the applicator roller 13 trop ^¬ fendes coating material 18, which is then passed through a drain 19 back to a reservoir, not shown, for the coating material 18. Within the collecting trough 17 is a is provided over the length of the applicator roller 13 and parallel to the longitudinal axis 21 erstre ^¬ ADORABLE application nozzle 23, which faces the applicator roller 13 and which is connected to the reservoir for coating material such that coating material 18 to a peripheral portion 24 of the applicator roll 13 can be sprayed and the applicator roll 13 is thus wetted in this peripheral portion 24.

Furthermore, a doctor blade 25 is mounted in the region of the collecting trough 17, which abuts the application roller 13 tangentially along a contact line 26 in a contact region 27, the abutment line 26 extending along the length of the application roller 13 being at a distance from the peripheral section 24 in which the applicator roll 13 is wetted.

In addition, the doctor blade 25 abuts against the peripheral area of the application roller 13, the diametrically ge ^¬ genüberliegt the peripheral region at which the flexible web 5 bears against the applicator roll. 13 This means in the case of the present exporting ^¬ approximately example, that the doctor blade 25 rests against the downward wei ^¬ send peripheral region ( "6 o'clock position") of the application roller 13 while the flexible web 5 to the face upward ^¬ the peripheral region ( "12 Clock position "). In addition, the doctor blade 25 is mounted relative to the application nozzle 23 so that the application nozzle 23 is arranged in the direction of rotation 15 of the applicator roll 13 in front of the doctor blade 25.

As shown particularly in FIGS. 3 and 4 can be seen, the Ab ^¬ grazing blade 25 is held in a clamping device 29, the first and second jaws 31, 33, whose mutually facing contact surfaces 35, extending 37 parallel to a clamping plane 39, wherein the doctor blade 25 is arranged between the clamping jaws 31, 33 and in the clamping plane 39 runs and the first jaw 31 abuts the side 41 of the scraper knife ^¬ 25, which is also on the applicator roller 13 ^¬ .

The distance of the contact surfaces 35, 37 of the clamping jaws 31, 33 perpendicular to the clamping plane 39 is at least partially greater than the thickness of the Abstreifmessers 25 so that the Ab ^¬ scraper blade 25 within the gap, in particular in the vicinity of the opening between the jaws 31, 33rd Game has. As further shown in Fig. 3 it can be seen in the Appendices ^¬ gefläche 35 of the first clamping jaw 31 is an elastic Halteele ^¬ element 43, preferably, taken from rubber, which extends over the contact surface 35 of the first jaw 31 beyond and to the doctor blade 25 is present. As a result, the stripping ^¬ knife 25 is releasably secured in the clamping device 29. However, it is also conceivable that the holding element is provided in the contact surface 37 of the second clamping jaw 33 or that both contact surfaces have holding elements.

In addition, the clamping device 29 on the second jaw 33, an elastic support member 45 in the form of a Gummilip ^¬ pe, adjacent to the contact portion 27 on the side facing away from the applicator roller 13 side of the Abstreifmessers 25 abuts this and the Absteifmesser 25 against the Auftragswal ^¬ ze 13 presses. In this case, the support member 45 extends over substantially the entire length of the applicator roll 13. As is apparent from Fig. 4, the support member 45 is disposed below the Ab ^¬ grader knife 25 spaced from the point at which the doctor blade 25 rests against the applicator roll 13. In order to ensure a constant or at least sufficient contact pressure over the entire length of the applicator roll 13 at an over its length bent applicator roll 13, the height of the support member 45 along the length of the applicator roll 13 vary, the height in the central region of the applicator roll 13 then lower is as in the end sections. Of the Course of the support member 45 is thus adapted to the bending line of the applicator roll 13. Instead of a support member in the form of a rubber lip, in principle, a separately adjustable support blade can be provided.

Furthermore, in the first embodiment, the arrangement of the clamping device 29 is aligned with the jaws 31, 35 such that the doctor blade 25 extends from the portion between the abutment surfaces 35, 37 in a direction towards the contact portion 27, wherein the circumference of the applicator roll 13 moves in the contact area against this direction. The application roller 13 thus moves in the contact region 27 to the doctor blade 25 and the direction of rotation 15 points towards the clamping device 29th

Finally, it can be seen from Fig. 1 that the clamping device 29 is perpendicular to the longitudinal axis 21 of the applicator roll 13 and parallel to the clamping plane 39 along a direction of movement 47 adjustable and movable, with a not shown motor is provided for a reciprocating motion or oscillation ,

As can be seen from Fig. 2, the Abstreifmesser 25 both on the side facing the applicator roller 13 side 41 and on the opposite side a plurality of recesses 49 and an engraving, which are formed linear and generally perpendicular or under an angle a less than 90 ° to the longitudinal axis 21 of the applicator ^roller 13 ver ^¬ run. In the embodiment shown here, the engraving 49 is inclined and at an angle a between 60 ° and 80 ° to the longitudinal axis 21 of the applicator roll 13. The ^{Vertiefun ¬} gene 49 and the engraving here has a depth perpendicular to the plane of the Abstreifmessers 25 between 0 and 40 ym, vorzugswei ^¬ se between 10 and 20 ym ym on. In a preferred manner The width of the recesses 49 may be about 0.25 mm and the distance may be between 0.1 mm and 0.5 mm.

The engraving with the recesses 49 is preferably always carried out so that they have a constant cross section over their length.

Furthermore, the doctor blade 25 is parallel to the longitudinal axis 21 of the applicator roller 13 extending through webs 51, which are also provided on the applicator ^roller 13 wei ^¬ send page 41 and on the opposite side of the Abstreifmessers 25 and of which the recesses 49 extending away from both sides of it.

In the embodiment described above, the Ab ^¬ grave knife 25 on both sides recesses 49, so that the doctor blade 25 can be used in a total of four orientations. But it is also conceivable that the depressions and possibly the web are provided only on one side.

The first exemplary embodiment of a coating device described above operates as follows.

The doctor blade 25 is held between the jaws 31, 33 of the clamping device 29, wherein the doctor blade 25 between the jaws 31, 33 has play and is held by the elastic holding member 43 in position. With such a structure of the clamping device 29, the doctor blade 25 can be pushed between the jaws 31, 33, without the need for additional fixing. In addition, by the play for the Abstreifmesser 25 and the distance between the jaws 31, 33, which is at least partially greater than the thickness of the Abstreifmessers 25, achieved that the force for the bending of the Abstreifmessers 25 perpendicular to the clamping plane 39 is required, significantly reduced is decorated. This is due to the fact that in contrast to the Si ^¬ situation where the doctor blade 25 is firmly clamped between two jaws, the doctor blade 25 can deform over a greater length. This reduced force results because too ^¬ that, for example, is not too large in a deflected applicator roll 13 of the pressure with which the doctor blade 25 is applied in the central region and thus not to be so large Ver ^¬ wear occurs in the middle portion of the application roller. 13

In operation, the flexible web 5 is conveyed in the transport direction shown by the arrows 9, 11 from the first to the second guide roller 1, 3. At the same time on ^¬ carrier roll 13 is driven in such a way that the direction of rotation 15 is such that the voltage applied to the flexible web 5 circumferential portion moves opposite to the direction of transport. 11 With the help of the applicator 23, which extends over the length of the applicator roll 13, coating material 18 is sprayed in the peripheral portion 24 on the applicator roll 13, where ^¬ collected in the dripping again from this part of the collecting trough 17 and the outflow 19 to the on ^¬ Tragsdüse 23 supplying container is returned.

The the application nozzle 23 downstream of the doctor blade 25 be ^¬ acts through the provided therein to the application roller 13 facing recesses 49 that after the contact with the doctor blade 29 only one of the engraving remains appropriate amount of Be ^¬ coating material on the application roller 13 (see Fig. 4 ). This amount depends on the number, the width and the depth of the recesses 49 in the doctor blade 25. The roughness of the application roller 13 thereby ensures that the coating material 18 evenly distributed over the roller top ^¬ surface. From the applicator roll 13, the Beschich ^¬ processing material 18 is then transferred to the flexible web 5. During operation, the doctor blade 25 is reciprocated along the direction of travel 47 by the motor, so that the abutment line 26 travels on the doctor blade 25, thus avoiding that the doctor blade 25 contacts the application roller 13 along only a single line is and only there the wear occurs, but the wear on the Absteifmesser is distributed over the width. On the other hand is achieved by the reciprocating motion associated with the inclined recesses 49, that the points at which the recesses 49 of the applicator roll 13 are opposite, migrate in the axial direction of the applicator roll 13, which reduces wear on the applicator roll 13 and evened , In particular, does not enter the case that certain areas of the circumference of the application roller 13 in general are not subject to wear, while the wear Between the seats ^¬ rule is very large, so that the application roller 13 is wavy in prolonged operation.

Characterized in that the doctor blade 25 has the through web 49 from which the recesses 49 extend on both sides away, the doctor blade 25 can be successively received in two orientations between the jaws 31, 33, in which the recesses 49 respectively to the applicator roll 13 ways. In addition, the doctor blade 25 can be rotated on both sides due to the depressions 49, so that it can then be used in a total of four positions. By this structure, the life of a single Abstreifmessers 25 can be extended.

By using an applicator nozzle 23 instead of a filled with coating material, laterally attached to the applicator roll mass template eliminates the need to provide a voltage applied to the applicator roller 13 seal assembly, which is the structure over the closest prior art, in which the doctor blade at the same time a Dich- simplification. In particular, the Abstreitmesser 25 need not be supported with a rea ^¬ accordingly large for sealing purposes bias so that it bears against the applicator roll. 13 Such a large bias voltage or the associated elastic deformation would lead to ver ^¬ reinforced wear on the application roller 13 and on the Ab ^¬ roaming knife 25th In the structure according to the invention, the doctor blade 25 only takes over the metering function.

Also in the second embodiment, shown in FIGS. 5 and 6, the application nozzle 23 is arranged in the direction of rotation 15 of the applicator roll 13 in front of the doctor blade 25, so that here again the wetted by the application nozzle 23 peripheral portion 24 spaced from the investment line 26 of Abstreif ^¬ knife 25 is. The clamping device 29 and the doctor blade 25 is positioned ^¬ made are formed in the same manner as in the first embodiment.

However, the second embodiment differs from the first embodiment in that here the clamping device 29 with the jaws 31, 33 is arranged so that the direction in which the Abstreifmesser 25 extends away from the clamping device 29 to the contact portion 27, parallel to the direction of rotation 15 of the applicator roll 13 in the contact region 27 extends. In other words, the direction of rotation 15 in the contact region 27 away from the clamping device 29, and the applicator roller 13 passes over the Abstreifmes ^¬ ser 25 with a movement away from the clamping device 29th

Finally, in the example shown in Figs. 7 and 8, the third embodiment, no applicator is present, son ^¬ countries is a mass template 53 filled ^¬ with coating material ge 18 and viewed in the direction of rotation 15 of the inking roller 13 disposed in front of the doctor blade 25th The applicator ^roll 13 extends into the coating material 18, so that this in a peripheral portion 24 is applied to the periphery thereof. The mass template 53 is surrounded by a collecting tray 17, so that ^¬ trespassing on the edge of the template 53 mass coating material collected 18 thereof and may be a tank Retired ^¬ leads.

The contact line 26, along which the doctor blade 25 rests against the applicator roll 13, is also in this Ausführungsbei ^¬ game spaced from the peripheral portion 24, in which the on ^¬ contract roller 13 is wetted, so that it is ensured here that the doctor blade 25 no sealing function but only has a dosing function.

In addition, the clamping device 29 is formed with the scraper blade 25 received therein as in the previous embodiments. Similar to the second embodiment, the doctor blade 25 extends in a direction away from the clamping device 29, which runs parallel to the direction of rotation 15 of the applicator roller 13 in the contact region 27. The fact that the doctor blade 25 extends in the ^¬ ser embodiment in the vertical direction does not change the fundamental function of the device.

Claims

claims

A flexible web coating device (5) having an applicator roll (13) driven in a direction of rotation (15) adjacent to a transport path (7) of the flexible web (5) to apply coating material (31) through contact to transmit the flexible web (5)

with elements (23, 53) with which the application roller (13) can be wetted on a peripheral portion (24) with coating material (18), and

with a doctor blade (25) extending over the length of the applicator roll (13), which bears tangentially along a contact line (26) in a contact region (27) and depressions on the side (41) facing the applicator roll (13) (49) extending perpendicular or at an angle smaller than 90 ° to the longitudinal axis (21) of the applicator roll (13),

characterized,

in that the doctor blade (25) is arranged such that the abutment line (26) of the doctor blade (27) is spaced from the peripheral portion in the direction of rotation (15).

2. Device according to claim 1, wherein the doctor blade (25) has a parallel to the longitudinal axis (21) of the contract roller ^¬ (13) extending through web (51) on the applicator roller (13) facing side (41) of the Abstreifmessers (27) is provided, and wherein the recesses (49) on both sides of the web (51) extending therefrom.

3. Device according to claim 1, wherein both sides of the doctor blade (25) with a web (51) and with deepening 49, wherein the webs (51) on both sides of the doctor blade (25) extend parallel to the longitudinal axis (21) of the applicator roll (13) and where ^¬ the depressions (49) on both sides of the doctor blade ( 25) on both sides of the web (51) extend away.

Device according to one of claims 1 to 3, wherein the depth of the recesses (49) perpendicular to the plane of the scraper blade ^¬ (25) between 0 and 40 ym, preferably between 10 ym and 20 ym, is located.

Device according to one of claims 1 to 4, wherein the recesses (49) over their length have a constant cross-section.

Device according to one of claims 1 to 5, wherein the recesses (49) extend at an angle between 30 ° and 90 °, preferably between 60 ° and 80 °, to ^{Längsach ¬} se (21) of the applicator roll (13).

A device according to any one of claims 1 to 6, wherein the doctor blade (25) is releasably secured in a clamping device (29) and wherein the doctor blade (25) extends from the clamping device (29) towards the contact region (27).

Device according to claim 7, wherein the clamping device (29) is arranged such that the direction of rotation (15) of the applicator roller (13) in the contact region (27) points towards the clamping device (29).

Device according to claim 7, wherein the clamping device (29) is arranged such that the direction of rotation (15) the application roller (13) points away from the clamping device (29) in the contact region (27).

10. Device according to one of claims 7 to 9, wherein the clamping device (29) comprises an elastic support member (45) on the side adjacent to the contact area (27) facing away from the application roller (13) of the ex ^¬ roaming diameter (25) this is present.

11. Device according to one of claims 7 to 10, wherein the clamping device (29) has a first and a second Klemmba ^¬ bridge (31, 33), the mutually facing contact surfaces ^¬ (35, 37) parallel to a clamping plane (39). ver run ^¬, wherein the doctor blade (25) between the jaws (31, 33) is arranged and in the clamping plane runs (39) and wherein the first jaw (31) abuts the side (41) of the doctor blade (25) on ^¬ abuts the support roller (13).

12. Device according to claim 11, wherein the distance between the abutment surfaces (31, 35) of the first and the second jaw (31, 35) is greater than the thickness of the Abstreifmes ^¬ sers (25) and wherein the first or the second terminal ^¬ jaw (31) has an elastic retaining element (43) which is attached to the contact surface (35).

13. Device according to one of claims 7 to 12, wherein the clamping device (29) parallel to the clamping plane (39) senk ^¬ right to the investment line (26) and parallel to the clamping plane (39) is adjustable.

14. Device according to claim 13, wherein a drive motor is provided to move the clamping device (29) perpendicular to the contact line (26) and parallel to the clamping plane (39) back and forth.

15. Device according to one of claims 1 to 14, comprising a first and a second guide roller (1, 3) which are arranged and driven, the flexible web (5) along the transport path (7) between the first and the second guide roller (1, 3) extends to för ^¬ countries, wherein the applicator roll (13) between the guide ^{rollers ¬} (1, 3) is arranged.

16. Device according to one of claims 1 to 15, wherein the elements with which the application roller (13) at a circumferential portion (24) with coating material (18) may be networked be ^¬ a over the length of the contract ^¬ roller (13) extending applicator nozzle (23) facing the applicator roll (13), and

wherein the application nozzle (23) in the direction of rotation (15) of the applicator roll (13) seen in front of the doctor blade (25) is arranged.

Device according to one of claims 1 to 15, wherein the elements with which the application roller (13) at a circumferential portion (24) with coating material (18) may be networked be ^¬ a mass template (53), which (with coating material 18) can be filled and into which the applicator roll (13) extends from above.