FI95300C - Method and apparatus for lubricating, wetting and / or cooling roll coatings to prevent damage to roll coatings - Google Patents

Description

95300

Method and apparatus for lubricating, wetting and / or cooling roll coatings to prevent damage to roll coatings For the purpose of lubricating, wetting and / or cooling roll coatings, lubricating and / or cooling the roll coatings to prevent damage to the roll coatings.

The invention relates to a method for lubricating, wetting and / or cooling roll coatings to prevent damage to roll coatings in coating or surface gluing of paper or similar web material in a film adhesive press in which a coating paste and a similar coating agent are applied to the by means of a coating member 15 loaded against the surface of said roll, wherein the coating material is transferred in a nip between the rolls of the film adhesive press to a paper web or similar web material passing through the nip.

The invention also relates to an apparatus for lubricating, wetting and / or cooling roll coatings to prevent damage to roll coatings in coating or surface sizing of paper or similar web material in a film adhesive press comprising a nip formed by a pair of rollers through which paper or similar web material is passed. a coating device provided with a coating member limited by a coating member loaded on the roll surface, a roll surface, edge seals, and a front wall, adapted to apply a coating film to the surface of the roll at the nip between the rolls.

, Two alternative methods and devices are commonly used for coating and surface sizing paper or similar web material, namely a blade coater or a rod coater. In film glue presses, the coating material is introduced directly onto the surface of the rolls of the glue press, from where it adheres to the web passing through the nip in the roll nip. In a film-adhesive press, either both sides of the web or only one side can be coated 2,900,300 at a time. As already stated above, either a rotating coating rod or a coating blade can be used as the coating member.

When the coating agent is applied, e.g. with a grooved coating rod, to the rolls of the adhesive press 5, the areas of the roll ends outside the web must be scraped clean with edge scrapers, otherwise this coating remaining on the roll end areas will cause considerable splashing in the roll nip. Scraping the edge areas has proven to be very cumbersome and, in addition, consumes a considerable amount of roll surface.

Particularly in the transition to high solids pigment coating, a variety of problems have been encountered in the edge-10 regions of the rolls. Traditional edge glues for surface gluing are usually located where they are easily clogged because the coating paste spills and splashes on them. If the edge showers become blocked, lubrication of the edge areas is prevented, which easily damages the end areas of the rollers.

15 Another very significant disadvantage of traditional solutions is also that the lubricating water from the edge jets goes directly to the return of the coating material, where it dilutes the coating paste. When pigment coating with coating pastes with a high dry matter content, the dilution waters must be minimized. Since the amount of lubricating water must be kept to a minimum, the wetting of the edge areas cannot be treated well enough. Small amounts of water cause the paste to dry on the surface of the roll, which in turn causes the coating rod to heat up in rod coaters and the coating blade to heat up in blade coaters, which can cause damage to the rod cradle and / or roll coating in the edge areas.

25 Problems have arisen in particular in film-adhesive press technology in the application of the web and in the initial stage of coating. Typically, in a film adhesive press, the initiation occurs by closing the nip of the film adhesive press at the stage when the web passes through the nip at full width. Thereafter, the roll surfaces of the film adhesive press are moistened over their entire width with water spray, after which the coating scraper is started to be loaded against the roll surfaces 30 and the supply of coating material is started. This closes the water mist. The problem with the start-up has been that the start-up water mists have acted unreliably, as the amount of water has already had to be kept very low for the reasons described above, so that the spray water entering the coating ban or return does not unduly dilute the coating agent.

5 First, the small amounts of water used may have resulted in the problem that the water itself is not sufficient to lubricate the roll surface sufficiently, so that contaminants from, for example, paper shreds or the like left in the nip between the coating cabinet and the roll surface may burn, melt or otherwise mechanically damage the roll. in which case the roller surfaces must always be re-sanded due to damage. Even more often, the small amounts of water used cause the problem that one of the water supply nozzles is blocked, so that in the absence of complete lubrication, the roll coating will melt or be mechanically damaged with very high certainty. When the rod is used as a coating scraper, the rod cradle may also melt or be mechanically damaged.

15 During the operation of the machine, the end areas of the roll shell outside the coating width are also cooled by various techniques, but mainly by water mist or water jets. A rather well-functioning solution has been previously described in the applicant's earlier FI patent No. 93242 (pat. No. 931341). However, the problem with some structures has been that due to the structure of the coating head, there has not been enough space to accommodate the above-mentioned device or it has had to be placed in a place that is difficult to maintain.

Water wetting of the roller surface has also caused other problems. As briefly stated earlier, water subjected to a driving ban from water wetting has caused problems 25, especially in cases where the coating has been carried out with high dry matter contents of the pasta, taking advantage of an application method based on hydrodynamic forces, such as. smooth large-diameter coating rod. The problem caused by the dilution of the paste is well illustrated by the fact that a decrease in the dry matter content of the paste by as much as one percentage point causes a decrease in the coating amount of the order of 1 g / m 2 when the other conditions are constant. This is illustrated in Figure A1, which shows the effect of the dry matter content of the coating paste on the coating amount 4,900,300 in a particular film-adhesive press using a smooth coating rod as the coating member. In the representation of Fig. AI: the horizontal axis is marked with the coating pressure of the coating bar [bar] 5 the vertical axis is marked with the amount of coating [g / m2] the upper curve marked with * and a solid line shows the dry matter content of the coating paste 63.4% 10 middle curve, denoted by o and the dashed line shows the dry matter content of the coating paste 60.4% The lowest curve denoted by D and the dotted line shows the dry matter content of the coating paste 15 57.8%.

In the case of coating amounts, on the other hand, 1 g / m2 already has a decisive effect on the quality of the coating.

The problem has arisen especially with the use of large amounts of coatings and dry matter contents.

20

It is an object of the present invention to provide a method and apparatus for avoiding and solving the problems and disadvantages of the prior art described above. To achieve this, the method according to the invention is mainly characterized in that the surface of the roll is wetted before the actual coating device by means of a wetting device spraying liquid on the roll to run.

The apparatus according to the invention, in turn, is mainly characterized in that the apparatus for lubricating, wetting and / or cooling the roll coating is mounted on the roll li 9595 before the applicator and comprises wetting liquid spraying means adapted to supply and devices for discharging the excess wetting liquid, in particular a separate collecting trough or the like, for scraping off the excess wetting liquid and for removing the excess wetting liquid from the actual coating material cycle.

The solution according to the invention achieves several significant advantages over the prior art, of which the following can be pointed out in this connection. In the invention, a large amount of water can be used for lubricating and wetting the surface of the roll, whereby as a result of the abundant use of water, the nozzles of the water supply apparatus cannot become clogged, but wetting, lubrication and cooling can be ensured in the desired area. Despite the large amount of water used, the water cannot dilute the paste in the driving cycle because the excess water is scraped off into a separate return circuit with its own scraper. Thus, only a thin film of water remains on the surface of the roll. A significant advantage of the invention is further that the method and device according to the invention can be used for wetting and lubricating the roll surface to the full width and, in addition, the method and apparatus according to the invention can be used for lubrication and cooling of areas outside the coating width. Furthermore, the method and device according to the invention can be applied to limit the coating width 20 in a manner similar to the applicant's previous FI patent application 931341. Other advantages and features of the invention will become apparent from the following detailed description of the invention.

Next, the invention will be explained in detail with reference to Figs. 25 of the accompanying drawing.

Figure 1 is a fully schematic side view of a film adhesive press to which the method and apparatus of the invention are applicable.

Figure 2 is an enlarged schematic side view of an advantageous embodiment of a device implementing the method according to the invention.

6 95300

Figures 3A and 3B show, as fully schematic side views, some alternative embodiments of the apparatus implementing the method according to the invention.

Fig. 4 shows a schematic perspective view of a part of the apparatus according to Fig. 3B.

Fig. 5A shows a view corresponding to Fig. 3B of a further embodiment of the apparatus according to the invention.

10 Figure 5B illustrates the apparatus of Figure 5A seen in the direction of the arrow S in Figure 5A.

Figures 6A, 6B and 6C show different implementations of the scraper of the apparatus according to the invention.

15

Fig. 1 thus schematically shows a film glue press comprising rolls 1 and 2 of a film glue press so that the first roll 1 and the second roll 2 together form a nip N through which the paper or board web W is passed. The rolls 1 and 2 of the film adhesive press are provided in a conventional manner with a roll coating 1a, 2a of flexible material. In the film adhesive press according to Fig. 1, coating film is applied to the surface of the rollers 1,2 by means of application devices 10,30. The film of coating material is transferred from the surface of the rolls 1 and 2 to a web or paper web W passing through the nip in the roll nip N. The coating can also be performed on one side, in which case a hard roll can be used as the counter roll of the roll 1 or 2.

25

From the film glue press 1 according to Fig. 1, it can be seen in general that the first roll 1 of the film glue press is mounted by means of bearing housings 3 on load arms 5 pivotally articulated to the film glue press body 6. for closing and opening the nip N. In the conventional manner, the bearing housings 4 of the second roll 2 of the film glue press are mounted directly on the body 6 of the film glue press 9595. From the general structure of the applicator device 10 it can be seen that the applicator beam 11 For this purpose, support members 14 for mounting the application beam 11 are mounted on the load arms 5. The applicator beam 11 is further supported on the load arms 5 by means of pivoting cylinders 13 with which the applicator beam 11 can be pivoted with respect to its articulation axis. The structure of the applicator device 30 of the second roll 2 is similar, with the exception that said applicator device 30 is in this case mounted directly on the body 6 of the film-adhesive press.

A coating device 12 with which a coating material film is applied to the surface of the roll 1 is not shown in more detail in Fig. 1, but a coating device of the short-delay type 1, such as that described in the aforementioned FI patent 93242 (Pat. No. 931341), can be used. against a loadable coating member which, together with the edge seals and the front wall 15 of the application zone, delimits a pressurized coating agent chamber into which the coating agent is fed before the coating member, thus under pressure. As the coating member, either a blade coater or a rotating coating rod, which can be smooth or grooved, can be used. Since these such members are already known per se, they are not shown in more detail in the figures of the drawing in this connection. The coating material overflow-20 trough or collection basin is indicated in Figure 1 by reference numeral 15.

Figure 2 is an enlarged detail of the film adhesive press of Figure 1. Thus, Figure 2 shows in more detail the structures associated with the first roll 1 of the film adhesive press. Thus, of the parts corresponding to Figure 1, the same reference numerals have been used in Figure 2. As shown in Fig. 2, an apparatus according to the invention for wetting, lubricating and cooling the roll surface 1a is mounted in connection with the adhesive press roll 1, which is generally indicated by reference numeral 20 in Fig. 2. The apparatus 20 thus comprises first a spray device 21 through which the roll 1 water is sprayed on the surface la for wetting, lubricating and cooling the roll surface. Most preferably, the spray device 21 comprises a cross-machine spray tube provided with a plurality of holes formed in the wall of the tube, through which 8 95300 water jets are directed to the surface 1a of the roll. In the solution according to the invention, a very large amount of water is used for wetting the roll surface, whereby if water enters the actual coating material circulation, it would considerably dilute the coating material. As a result, the apparatus 20 according to the invention is provided with a scraper 22 which is loaded with a very small force against the surface 1a of the roll. Further, the apparatus 20 is provided with a collecting trough 23, the outlet pipe 24 of which leads from the glue press to the pulper or channel.

Thus, although a large amount of water is used in the method according to the invention to irrigate and / or cool and / or lubricate the roll surface 1a, excess water from the roll surface 1a is scraped off by means of a scraper 22 into its own collecting trough 23 separate from the coating material collecting basin 15. The excess water is thus discharged through the outlet pipe 24 in its own return circuit away from interfering with the coating process. Thus, in the method according to the invention, the use of a large amount of water ensures that the holes of the spray tube 21 remain open and the roll surface 1a is completely wetted, but at the same time the scraper 22 scrapes off excess water from the roll surface and discharges it from interfering with the coating process. The scraper 22 leaves only a very thin film of water on the roll surface 1a, which ensures, for example, the lubrication required for the actual coating member when starting the coating process.

The apparatus according to the invention can be used during driving only at the end areas of the roll or at the starts at full width to moisten the roll surface 1a along the entire axial length of the roll. Furthermore, the invention can be applied in such a way that both the end areas during driving and at the beginning of the whole roll become moistened and lubricated in the intended manner. Figures 3A, 3B and 4 are intended to illustrate various embodiments with which the method according to the invention can be implemented.

25

Fig. 3A shows that the scraper 22 of the apparatus 20 according to the invention can be turned in a simple manner to the load position against and away from the roll surface 1a, which is indicated by broken lines in Fig. 3A. The operation of the apparatus 20 according to Figure 3A in a preferred embodiment of the invention may be e.g. At the beginning of the coating, the scraper 22 of the apparatus 20 according to the invention turns to the load position against the roll surface 1a, i.e. to the working position, whereby the water supply opens from the nozzle 21. The film sprayed from the nozzle 21 leaves a film on the roll surface 1a and most of said lubrication / cooling water is scraped from the surface, said water being directed to a collecting trough 23 from which it is discharged. When the actual coating scraper, not shown in Fig. 3A, 5 enters its working position, said coating scraper is loaded with at least a partial load relative to that used during the coating process.

In the next step, the coating paste is most preferably fed to the pressurized coating agent chamber of the short residence unit, whereby the film on the surface 1a of the roll consists of wetting water and coating agent. At this point, the load of the actual coating scraper is set to its actual running value and the water supply for lubrication of the roll surface 1a from the spray pipe 21 is closed. Immediately thereafter, the scraper 22, i.e. the water scraper, belonging to the apparatus 20 according to the invention moves to the open position, which is illustrated in broken lines in Fig. 3A. Thus, when starting the coating process, sufficient lubrication of the roll surface 15 has been ensured.

However, as has already been shown from the previous description, lubrication / cooling operation is also necessary during the coating process itself in the end areas of the roll 1. An attempt has been made to illustrate such an application with particular reference to Figures 3B and 4. In Figures 3B and 420, the apparatus according to the invention for wetting, lubricating and cooling the roll surface 1a is generally indicated by reference numeral 20a. The embodiment of Figures 3B and 4; the shape corresponds to that shown in Figure 3A, so that the apparatus 20a most preferably comprises a spray device formed by a nozzle 21, a scraper 22, a collecting trough 23 and an outlet pipe 24. In the embodiment of these Figures 3B and 4, the nozzle 21 and scraper 25 22 extend over the entire machine width.

The embodiment of Figures 3B and 4 differs from that shown in Figure 3A in that in these embodiments the apparatus 20a of the invention further includes edge scrapers 22a that are operative during coating and thus scrape the end areas of the roll 130 in areas outside the coating width. The width of the edge scraper 22a is indicated in Fig. 4 by the reference numeral a. When the edge scraper 22a is in operation, it naturally also requires water spray, which can be realized, for example, by providing the nozzle 21 with the necessary valve members (not shown) to keep the edge scrapers 22a in operation. nozzles or similar holes of the spray pipe 21 open only in the end areas b. Another possibility is that for the edge scrapers 22a 5 the apparatus 20a is provided with its own spray pipes 21b which extend in the width direction of the machine only beyond the width of the edge scrapers 22a. These "edge jet tubes" 21b are illustrated in Figure 4 by broken lines.

In the embodiment of Figures 3B and 4, the apparatus 20a operates as follows. At the start of the coating-10 process, i.e. the take-off, the full-width water scraper 22 of the humidification apparatus 20a turns to the loading position 1a, i.e. to its working position, when the water supply further out through the outlet pipe 24.

When the actual coating scraper is in its working position, said coating scraper is loaded with at least a partial load relative to that used during the coating process itself. When the coating scraper is in its working position, the coating paste is fed to the coating material chamber of the coating device, whereby the film on the roll surface 1a consists of the wetting water supplied by the wetting device 20a and the actual coating material 20. The load of the actual scraper is then set to its running value and the water supply at full width from the nozzle 21 is closed as the scraper 22 moves to its open position.

When the wetting of the roll surface 1a at full width is stopped, the edge scrapers 22a turn to their load position, which is illustrated in broken lines in Fig. 3B. The supply of wetting water is continued from the width of the edge scrapers 22a either by closing the other holes of the nozzle 21 and extending the water supply from the nozzle 21 from the end areas to a width b corresponding to the width a of the edge scrapers 22a, or so that the edge scrapers 22a are provided with separate water tubes 21b 30 as the edge scrapers 22a turn to their working position. In this case, of course, the water supply from the full-width nozzle 21 is completely shut off. If the water supply, both in full width and at the ends only, is handled by means of the actual nozzle 21, said nozzle 21 must, of course, be provided with the necessary valve means by which the water supply to the roll surface 1a can be controlled as desired.

Deviating from the above, the edge scrapers 22a in the end areas of the roll 1 can also be kept in operation with a full-width water scraper 22 during start-up. It was also pointed out above that both the full-width water scraper 22 and the edge scrapers 22a are pivotable between the working position and the neutral position. The simplest way to do this is to have these scrapers 22, 22a mounted, for example, as shown in Fig. 4 10 on shafts 22 ', 22'a which can be turned as described above.

Figures 5A and 5B show another embodiment of an apparatus according to the invention for wetting, lubricating and cooling the roll surface 1a. Fig. 5A is a side view of the apparatus corresponding to e.g. the representation of Fig. 3B. Figure 5B shows an apparatus 15 according to the invention, seen in the direction of arrow S in Figure 5A. The wetting apparatus in these Figures 5A and 5B is generally indicated by reference numeral 120. The embodiment of Figures 5A and 5B is very similar to that shown in Figures 3B and 4, such that the humidifying apparatus 120 of Figures 5A and 5B comprises a machine transverse width across the width of the roll 1. extending nozzle 121. Further, the humidification apparatus 120 is provided with a collecting trough 123 from which an outlet pipe 124 leads to e.g. a pulper or a duct. The apparatus 120 further includes a water scraper 122 extending substantially beyond the track width. The water scraper 122 is mounted on a shaft 122 'which allows the water scraper 122 to be pivoted between the working position and the open position. The apparatus 120 is further provided with edge scrapers 122a mounted on shafts 122'a, on which said edge scrapers 25 are also pivotable between the working position and the open position. In addition, the apparatus 120 is further provided with edge spray tubes 121b extending to a corresponding width with the edge scrapers 122a.

In contrast to the embodiment of Figures 3B and 4, the apparatus 30 of Figures 5A and 5B is configured such that the edge scrapers 122a and edge jet tubes 121b are displaceable in the cross machine direction, as illustrated by the arrows in Figure 5B. This transverse displacement of the edge scrapers 122a and the edge spray tubes 121b in the machine direction can also affect the adjustment of the coating width, since less coating paste is transferred to the wetted roll surface area than to the non-wetted part of the roll surface. Adjusting the wetting width in this way is particularly important when the coating width is adjusted by the coating agent application unit itself.

In other respects, the operation of the humidification apparatus of Figures 5A and 5B can be described in a manner similar to that performed in connection with the apparatus of Figures 3B or 4.

The scraper itself, which is used to scrape off excess wetting water, can be implemented in a variety of alternative ways. Efforts have been made to illustrate these different scraper options in Figures 6A, 6B and 6C. First, the scraper 222 illustrated in Figure 6A can be used as the scraper. Similarly, the scraper was also shown in the earlier embodiments. In Fig. 6A the blade scraper is indicated by reference numeral 222. The blade scraper 222 is mounted on a holder 222 "attached to the shaft 222 '. The collecting tray 15 is indicated in Figs. 6A, 6B and 6C by reference numeral 223. When a scraper scraper 222 is used as a scraper. with a thin layer of water, which can typically be of the order of less than 1 g / m 2.

20 Larger amounts of water are usually difficult to cover in a controlled manner with the scraper 222.

In this case, a scraper rod, for example, can be used as the scraper. Efforts have been made to illustrate such alternatives in Figures 6B and 6C. In these figures, the coating rod is denoted by the reference numeral 222m. In each of said embodiments, a holder 222 "is mounted on the shaft 222 ', having a holder for the rod 222m formed in the free end of the blade 222n in the embodiment of Figure 6B. In the embodiment of Figure 6C, a rod 22m of polyurethane or similar material The load with which the rod 222m is loaded against the surface of the roll la is very small.

30 A smooth rod or other coating scraper can also be used as a humidifier scraper.

13 95300

In wetting the roller surface 1a, wetting with water has been pointed out in the previous description. However, other wetting fluids can also be used for wetting, for example wetting solutions to which lubricating and friction reducing chemicals have been added.

5

The invention has been described above by way of example with reference to the figures of the accompanying drawing. However, the invention is not limited to the examples shown in the figures, but the various embodiments of the invention may vary within the scope of the inventive idea defined in the appended claims.

10

Claims (21)

14 95300 A method for lubricating, wetting and / or cooling roll coatings to prevent damage to roll coatings in coating or surface sizing paper or similar web material 5 in a film adhesive press in which a coating paste or similar coating agent is applied to a coating edge on the surface (1a) by means of a coating member loaded against said roll surface, the coating material being transferred in a nip (N) between the rolls (1,2) of the film adhesive press to a paper web (W) passing through the nip or a similar web material, in which method the roll surface (1a) is wetted a liquid, characterized in that the surface (1a) of the roll is wetted before the actual coating device by means of a wetting device (20,20a, 120) by introducing a liquid onto the surface (1a) of the roll, the wetting liquid on the surface of the roll (1a) into a film of the desired thickness by means of a scraper (22,22a, 122,122a, 222,222m) belonging to the wetting apparatus 15 (20,20a, 120) and said scraper . Method according to Claim 1, characterized in that, when surface gluing is started, the wetting of the roll surface (1a) and the scraping off of the excess wetting liquid are carried out over substantially the entire width of the roll (1). Method according to Claim 1 or 2, characterized in that when the coating member of the actual coating device (12) of the film adhesive press roll (1) is set to its running value and when the supply of coating agent to the coating agent coating chamber is started, the roll surface wetting and wetting the full width of the roll (1) is stopped. Method according to one of the preceding claims, characterized in that during the surface gluing / coating process, the wetting of the roll surface (Ia) and the wetting of the excess wetting liquid 15,90000 are continued in the end areas of the roll (1), in particular in the end areas beyond the coating width. Method according to one of the preceding claims, characterized in that the wetting of the surface (1a) of the roll 5 is carried out by spraying a wetting liquid on the surface (1a) of the roll by means of a spray pipe (s) (21.2Ib, 121.12Ib) or the like. Method according to one of the preceding claims, characterized in that the same spray pipe (21,121) or a similar spraying device is used for wetting the roll surface (1a) to its full width and end areas, so that the wetting width is adjusted as desired by valve members (21,121) or the like. Method according to one of Claims 1 to 5, characterized in that separate spray tubes 15 (21, 21b, 121, 121b) are used for wetting the roll surface (1a) to its full width and for wetting the end areas. Method according to one of the preceding claims, characterized in that the scraping of the excess wetting liquid over the entire width of the roll (1) and for the end areas is carried out by means of separate scrapers (22, 22a, 122, 122a, 222). 20 Method according to claims 7 and 8, characterized in that said separate jet tubes (21b, 121b) and separate edge scrapers (22a, 122a) are adjusted by separate jet tubes (21b, 121b) and separate edge scrapers (22a, 122a) used for wetting the end areas of the roll. by moving the roll in the axial direction 25. Method according to one of the preceding claims, characterized in that the coating width is adjusted by adjusting the wetting width. Method according to one of the preceding claims, characterized in that water is used as the wetting liquid. 16 95300 Method according to one of the preceding claims, characterized in that lubricating and friction-reducing chemicals are added to the wetting liquid. Method according to one of the preceding claims, characterized in that the film coating is carried out at once only on one side of the web only or that both sides are coated at a time. Apparatus for lubricating, wetting and / or cooling roll coatings to prevent damage to roll coatings during coating or surface sizing of paper or similar web material 10 in a film sizing press comprising a nip (N) formed by a pair of rolls (1,2) through which paper or similar web material (W) is passed and which adhesive press is provided with applicator devices (10, 30) comprising a coating member (roll), a roll surface, edge seals and a coating device (12) with a coating agent chamber delimited by a coating member to be loaded on the surface (1a, 2a) of the roll (1,2), adapted to apply (1a) a coating film which, in the nip (N) between the rollers (1,2), is transferred to the surface of the web material (W), the apparatus (20,20a, 120) for lubricating, wetting and / or cooling the roll coating comprising wetting liquid spraying means (21,21b); , 121,121b), characterized in that that the apparatus (20, 20a, 120) is mounted in connection with the roll (1,2) before the applicator 20 and that said spraying devices (21, 21b, 121, 121b) are adapted to supply a wetting liquid to the surface (1a) of the roll, the apparatus further comprising scrapers (22); , 22a, 122,122a, 222,222m) for dispensing the wetting liquid into a film of the desired thickness on the roll surface (1a) and scraping off the excess wetting liquid, as well as separate wetting liquid removal devices 25 from the actual coating cycle, in particular a separate collecting tray (23) Apparatus according to claim 14, characterized in that the spraying devices comprise at least one spray pipe (21, 121) extending at least over the coating width. 30 17 95300 Apparatus according to claim 15, characterized in that the spray pipe (21.121) is provided with valve members or the like, by means of which the spray width can be adjusted in the desired manner. Apparatus according to claim 15, characterized in that the spraying devices further comprise separate edge spray tubes (21b, 121b) adapted to spray the wetting liquid on the end areas of the roll. Apparatus according to any one of claims 14 to 17, characterized in that the scraper devices 10 comprise a scraper (22.122) extending at least substantially over the coating width and separate edge scrapers (22a, 122a). Apparatus according to Claims 17 and 18, characterized in that the edge spray tubes (21b, 121b) and the edge scrapers (22a, 122a) are displaceable in the axial direction 15 of the roll in order to adjust the wetting width. Apparatus according to one of Claims 14 to 19, characterized in that the scraper devices comprise a blade scraper (22, 22a, 122, 122a), a grooving rod, a smooth rod (222m) or another coating scraper. 20 Apparatus in a film-adhesive press according to one of Claims 14 to 20, characterized in that the film-adhesive press is arranged to apply a film coating at one time only to one side of the web only or to coat both sides of the web at a time. 25 18 95300