JP3157355U - Device for coating the running end of paper, cardboard or another fibrous material web - Google Patents

Abstract

An apparatus for coating a paper web, cardboard web or another fibrous material web that travels during manufacture and / or quality improvement. The coating apparatus is disposed at a distance from the fiber material web 2, and the coating apparatus applies a liquid-to-paste coating material provided for coating to the fiber material web 2. And is provided with at least one guide element 7 arranged in the coating device and / or arranged downstream of the coating device for guiding the fiber material web 2 . Furthermore, the guide element 7 is formed such that the fibrous material web 2 guided by the at least one guide element 7 does not contact the surface of the at least one guide element 7 in the region of both web edges 2a, 2b. [Selection] Figure 2

Description

  The present invention is an apparatus for coating a paper web, cardboard web, or another fiber material web that travels during manufacturing and / or quality improvement, and is provided with a coating apparatus, The coating device is arranged at a distance from the material web, and the coating device is adapted to provide the fibrous material web with a liquid to pasty coating material provided for coating. And / or a type provided with at least one guide element disposed on the downstream side of the coating apparatus.

  In such a configuration, the coating can be performed without an excessive amount or excessively. According to the meaning of "no excess", the amount of coating medium can be saved, for example a coating with the same amount of medium, for example a pigment, as is left on the fibrous material web to be coated is applied. . As a result, it is possible to omit the subsequent doctor element that achieves a desired coating amount in the “excess coating”.

  Known coating devices or coating devices that operate without an excess amount are curtain coating devices and spray coating devices. The curtain coating device is understood from German Offenlegungsschrift 1,975,625. In a curtain coating device, a closed curtain is formed which extends over the entire width of the fiber material web, mainly according to gravity. A spray coating device is known from EP 08133030 and emits a number of spray jets under high pressure extending across the width of the fiber material web.

  A curtain formed by a curtain coating device and supplied to the coating medium on the basis of a specific force, for example electrostatic force, or falls under the action of gravity onto a running surface or a fibrous material web, as well as spray coating The spray jet of the device accumulates on the surface of the fibrous material web as a coating contour, where it settles as a film after a predetermined point in time.

  The fibrous material web is supported and guided by guide elements during the described coating process. In many cases, the guide element is formed as a rotating guide roller, which has a length greater than the width of the fiber material web.

  Here, the coating takes place in the region between such guide elements or directly above such guide elements. In the two described configurations, the fiber material web is disadvantageously applied in the region of the web edge (at the end and bottom surfaces of the web), in particular in the coating medium curtain of the curtain coating device, in the coating medium. It is crafted. Such “paint” deposits are transmitted to the surface of the guide element which is relatively wide or protrudes below the web edge, so that the edge region of the fibrous material web is continuously as the coating process proceeds. In other words, it is inconveniently coated from below. This state is shown in FIG. The excess “paint” present in the web edge area does not dry the web completely. This also contaminates the guide elements in the subsequent section of the web making machine. This can go beyond the drying equipment following the coating process and reach the tambour where the finished web is rolled up, resulting in very inconvenient web edge adhesion.

  The same negative effect can also occur with blade coaters and film coaters where excess coating media is attached and then scraped to the desired coating amount.

  Starting from this, the task of the present invention is to provide a suitable coating device which avoids the disadvantages of the prior art.

  This problem is solved by an apparatus having the constituent means described in the characterizing part of claim 1.

  According to the invention, at least one guide element for guiding and supporting the fibrous material web is formed on its surface so as not to contact the traveling fibrous material web in the region of both edges.

  Such an arrangement ensures that the guide elements arranged in the coating device and / or subsequent guide elements are not contaminated. The web edge adhesion, which occurs in the prior art when rolling up a fibrous material web, is no longer caused by the inventive form of the at least one guide element.

  The guide element according to the invention is advantageously formed as a rotating guide roller and comprises a roller sheath. As roller coating, an elastomer layer, in particular made of rubber, works. A hard layer of chromium is also conceivable.

  According to a particularly simple form for solving the present invention, the guide element has a smaller diameter in both edge regions than in the remaining region, i.e. the central region. It is sufficient that the diameter is reduced by about 10 mm. This is achieved simply by the fact that the coating thickness, i.e. the roller coating, is smaller at the end of the guide element or if the roller radius is chosen appropriately small in the edge region.

  Furthermore, according to one form of the invention, the guide element is retracted at a value X up to 400 mm in the axial direction in both edge regions, ie has a relatively small diameter over the partial length X. .

  As a result, the fibrous material web guided by the guide element below the coating device protrudes at both edges of about 2 mm to 50 mm, in particular 5 mm to 20 mm, so that the web edge covered thereby is guided by the guide element or guide. It is ensured that it does not come into contact with the roller and therefore does not become contaminated.

  An equivalent effect is obtained simply when the guide element has a length smaller than the width of the fibrous material web.

  In order to guide different fiber material web widths with the same kind of guide element, the guide element has at least one additional area with a smaller diameter or a smaller roller sheath thickness at the two edge regions than at the remaining regions. Have. This makes it possible to use the same kind of guide elements in various web widths. Therefore, it is not necessary to manufacture a large number of different kinds of guide elements. Moreover, there is no need to reequip the machine when changing sizes, which saves significant time and cost.

  An advantageous fit for each web width is obtained by the fact that at least one lateral end of the guide element can be fitted with a segment portion which serves to extend the guide element to the desired extent. Such an attachment portion or segment portion is formed so as to be rotatable, and of course does not rotate together with the guide element or the guide roller during operation. Continuous adjustment is possible. For this purpose, a wide variety of forms are possible.

  The guide element according to the invention is preferably arranged in a known curtain coating device and / or arranged downstream of the curtain coating device. Such a curtain coating device is intended to apply coating media, in particular paints containing pigments, as closed curtains or curtains formed mainly according to gravity and / or under the influence of electrostatic forces (and surplus). Without medium), the fiber material web being guided and supported via at least one guide element according to the invention in the area of the coating device and also downstream of the area Run.

  The use of guide elements according to the present invention is also advantageous in spray coating devices, where the spray coating device provides the coating medium as individual or multiple spray jets to the fibrous material web.

  Furthermore, the use of the guide element according to the invention is also possible with a coating device, for example a blade coater, a film coater, etc., which provides an extra coating medium to the fibrous web.

  Existing machines can be retrofitted or retrofitted with guide elements or guide rollers formed according to the invention in a very simple configuration.

  The configuration according to the invention avoids contamination of the guide element and subsequent guide elements at the application site and adhesion of the web edge during winding of the fiber material web with a possible simple construction.

  Embodiments will now be described in detail with reference to the drawings.

FIG. 1 schematically shows one form of a fiber material web to be applied by a curtain coating device, which has an adverse effect according to the prior art. It is the schematic which shows one form of the guide element by this invention. It is the schematic which shows one form of the guide element by this invention. It is the schematic which shows one form of the guide element by this invention. It is the schematic which shows one form of the guide element by this invention. It is the schematic which shows one form of the guide element by this invention. It is the schematic which shows one form of the guide element by this invention. It is the schematic which shows one form of the guide element by this invention. It is the schematic which shows one form of the guide element by this invention. 1 is a schematic view showing a one-position structure of guide elements according to the invention formed inside a machine for producing a fibrous material web; FIG. 1 is a schematic view showing a one-position structure of guide elements according to the invention formed inside a machine for producing a fibrous material web. FIG. 1 is a schematic view showing a one-position structure of guide elements according to the invention formed inside a machine for producing a fibrous material web. FIG.

  In the drawings, the same components or components are denoted by the same reference numerals.

  FIG. 1 shows a coating device 1 according to the prior art, in which a fiber material web 2 made of paper or cardboard is coated. As can be seen, the coating medium 3 is directly attached to the fibrous material web 2 as the coating layer 4. Further, as can be seen, the coating medium 3 is a curtain coating device 6 that acts in a non-contact manner as a curtain 5 falling in a vertical direction on the fiber material web 2 (in view of the main use example here). Given by. The coating device 6 is arranged above the fiber material web 2. Since the arrangement distance can be adjusted, the curtain height h is 50 mm to 500 mm, and in many cases 150 mm to 220 m. The coating medium 3 (also called a coating agent or a coating agent) is, for example, a paint. The paint consists of a mixture of mineral pigments, natural or synthetic binders and chemical auxiliaries.

  The fiber material web 2 guides the web 2 through at least one guide element 7 arranged and / or post-installed in the coating device 6 during production and during the quality enhancement by the aforementioned coating, And in order to support, it travels in the traveling direction R.

  In covering with the illustrated curtain coating device 6 (even a spray coating device not shown or a coating device not shown), the fibrous material web 2 is a region of the web edges 2a, 2b. Thus, not only the end surface (side surface) 2c but also the lower surface 2d is coated with the coating medium in the same manner. As a result, the surface of the relatively wide guide element 7 or the guide element 7 projecting below the web edge is also contaminated by paint deposits. This contamination is indicated by V and proceeds in the direction of the horizontal arrow during the manufacturing and coating process with the traveling web. The edge region of the fiber material web 2 is therefore disadvantageously coated from below. This is indicated in FIG. 1 by individual small circles on the collecting groove 8 for the curtain part 5a flowing laterally. Based on the excess media present in the edge areas of both web edges 2a, 2b, the edge areas cannot be completely dried and are therefore not shown for web-making machines or quality-enhancing machines. The subsequent guide element 7 present in the subsequent section is also contaminated. Contamination passes beyond the subsequent drying device and reaches the drum where the finished web is rolled up (Tambour) where the web edges 2a, 2b adhere.

  The present invention will be described with reference to FIG.

  As shown in FIGS. 2 to 8, the at least one guide element 7 has a surface of at least one guide element 7 in the region of the web edges 2a, 2b where the fibrous material web 2 guided by the guide element 7 is present. It is formed so as not to come into contact with 7c and to be prevented from being contaminated as described above.

  In addition, the guide element 7 is preferably a rotating guide roller provided with a roller covering. The roller covering is a rubber layer here, but is not particularly illustrated.

  As shown in FIG. 2, the guide element 7 has a length L that is smaller than the width B of the fibrous material web 2. Therefore, the fibrous material web 2 guided by the guide element 7 can project from about 2 mm to 50 mm, in particular from 5 mm to 20 mm, respectively, at both web edges 2a, 2b. For relatively light paper, a slight protrusion is advantageous. For a relatively heavy paper having a relatively large area specific mass, the protrusion is selected to be relatively large.

  As shown in FIG. 3, the guide element 7 has an outer diameter smaller than that of the remaining region of the surface 7c at both edge regions 7a and 7b. The difference in diameter is indicated by Δd and is preferably at least 10 mm. In the form of the guide element 7 as a rotating guide roller provided with a rubber covering, the covering thickness is smaller in the corresponding edge region than in the remaining region. Furthermore, as shown in FIG. 3, the guide element 7 is retracted by a value x in the axial direction in both edge regions 7a, 7b. x may be a value up to 400 mm.

  On the other hand, in the embodiment shown in FIG. 4, the guide element 7 has both the edge regions 7a and 7b (only the region 7b is shown) and has a smaller diameter or a smaller roller covering portion thickness than the remaining regions. At least one additional area 9 is provided. This makes it possible to use fiber material webs to be guided of various widths or sizes (formats) I, II and possibly other sizes. Size I thus reaches, for example, area 9 and size II almost reaches the edge of the guide element. Other areas 9-n are also conceivable.

  In order to adapt the guide element 7 used to the width of the fiber material web to be produced or to be upgraded or to be coated, various forms are shown in FIGS. The segment portion or additional portion 10 is shown. The additional portion 10 can be attached to at least one side end portion 7.1 or 7.2 of the guide element 7. As a result, the guide element 7 can be extended by a desired value.

  In FIG. 5, the 1st form of the addition part 10 was shown. The addition part 10 has a certain hyperbolic paraboloid shape. Here, the guide element 7 is a rotating roller, whereas the additional portion 10 attached to the both end portions 7.1 and 7.2 of the guide element 7 with a minimum gap is rotatable. , Do not rotate together during rotation operation. By rotating about the vertical axis A, the required surface dimension z or z1 can be adjusted as indicated by the wavy line on the right side of the figure. In this configuration, the necessary safety clearance for the existing pulley 11 to guide the fibrous material web is maintained.

  FIG. 6 shows a simple form of the addition section 10.1, which consists of individual disks 12 that can be combined and rotated together.

  FIG. 7 shows a semi-circular molded body that can be attached as another form of the additional portion 10.2. The semi-circular molded body can be arranged side by side in an arbitrary configuration, and can be replaced. It is. The side-by-side arrangement is performed until the desired length of the guide element 7 is obtained. The additional part 10.2 can be mutually coupled by the screw coupling part 13 or separated again.

  FIGS. 8a and 8b show another form of the addition part 10.3, which is the optimum form for an off-line machine with a pull-in rope for the fiber material web 2. FIG. ing. Reference numeral 11 denotes a pulley for a pull-in rope (not shown) similar to FIG. The additional portion 10.3 is composed of two segment portions 14, 1, 14.2 that can be rotated relative to each other. Accordingly, variable width adjustments for various web widths can be made as well, and in this case the desired length z can be adjusted. In this case, the adjustment is performed in stages.

  In FIG. 8 a, the segment portions 14, 1 and the segment portions 14, 2 arranged so as to face each other are each provided with an oblique rotation surface 15. In the form shown in FIG. 8b, the rotation surface 15 of the segment part 14.1 is formed in a concave shape, and the rotation surface 15 of the segment part 14.2 is formed in a convex shape.

  9 to 11 show a form having usable portions of the guide element 7 described with reference to the previous figure inside the coating apparatus 1 or the manufacturing machine or the quality-improving machine. These locations are indicated by hollow arrows.

  In all the forms shown in FIGS. 9 to 11, the fibrous material web 2 has the first guide element 16 disposed on the web surface opposite to the covering surface, which is disposed transversely to the web running direction R. The first guide element 16 is formed longer than the width dimension of the fiber material web 2 as in the prior art. Of course, the guide element 16 may be formed to have the same length as the guide element 7 according to the present invention, and therefore may be formed with the guide element 7 to be shorter than the web width.

  As illustrated, the fiber material web 2 passes through the coating position Ao on the downstream side of the guide element 16 in the travel direction, where it is applied to the coating device (here again the curtain coating device) arranged above the fiber material web 2. 6 is shown). A so-called air turn 17 is arranged on the downstream side of the coating device 6 with the width of the web to be coated, as seen in the running direction R. The air turn 17 turns the fibrous material web and further dries here. . Further downstream, the fiber material web 2 reaches the drying device 18 (infrared dryer and / or air flotation dryer) acting in a non-contact manner, and further reaches the processing station 20 shown in FIG. . The processing station 20 may be another coating device, a drying device, a smoothing device, or the like, for example. The guide element 7 according to the present invention may be arranged up to the winding roll 25.

  As can be seen from FIG. 9, the application of the covering medium 3 to the fiber material web 2 takes place in the non-supporting area of the web, and on the downstream side there are guide elements 7 or guide rollers formed according to the invention. Has been placed.

  In the embodiment shown in FIG. 10, the first guide element 7 according to the present invention is provided on the web surface on the opposite side of the coating surface below the coating device 6 and is therefore arranged directly on the coating device. It is installed. The second guide element 7 according to the present invention is arranged on the downstream side of the first guide element 7 in the traveling direction R of the fiber material web 2.

  In FIG. 11, instead of a guide roller having a relatively small diameter, a so-called support roller having a relatively large diameter and supporting the fibrous material web 2 during coating is shown. The support roller here forms the guide element 7 and is therefore arranged directly in the coating device 6.

  The present invention is not limited to the illustrated form. Individual combinations or comprehensive combinations of the illustrated forms are also conceivable.

Claims (11)

An apparatus for coating a paper web, cardboard web or another fibrous material web that travels during production and / or quality improvement,
A coating device (6) is provided, the coating device (6) being spaced from the fiber material web (2), the coating device (6) for coating The coating material (6) for guiding the fiber material web (2) is provided with a liquid-like paste-like coating material (3) provided on the fiber material web (2). And / or at least one guide element (7) arranged downstream of the coating device (6),
The guide element (7) is a surface (7c) of at least one guide element (7) in the region of both web edges (2a; 2b) where the fibrous material web (2) guided by the at least one guide element (7). Device for coating a paper web, cardboard web or another fibrous material web that travels during manufacturing and / or quality improvement.   2. The device as claimed in claim 1, wherein the guide element is provided with a rotating guide roller provided with a roller covering.   Device according to claim 1 or 2, wherein the guide element (7) has a smaller diameter in both edge regions (7a; 7b) than in the remaining region (7c).   4. The device according to claim 3, wherein the guide element (7) is retracted axially with a value X of up to 400 mm in both edge regions (7a; 7b).   3. The device according to claim 2, wherein the guide element (7) has a roller sheath thickness in both edge areas (7a; 7b) which is smaller than the remaining area (7c).   The guide element (7) has at least one additional area (9) in both edge regions (7a; 7b) having a smaller diameter or smaller roller sheath thickness than the remaining region (7c). 6. A device according to claim 1, wherein the device is adapted for use with fiber material webs (2) to be guided in various widths.   The guide element (7) has a length (L) smaller than the width (B) of the fibrous material web (2), and the fibrous material web (2) guided by the guide element (7) 3. The device according to claim 1, wherein the web edge (2a; 2b) projects from 2 mm to 50 mm, preferably from 5 mm to 20 mm.   At least one side edge (7.1; 7.2) of the guide element (7) is provided with an additional part (10; 10.1, 10.2,. 10. A device according to any one of claims 1 to 7, wherein 10.3) is adapted to be mounted.   The guide element (7) is disposed in a coating apparatus, and the coating apparatus, for example, a surplus amount of coating medium, as in a known curtain type coating apparatus (6) or spray coating apparatus. 9. A device according to any one of the preceding claims, wherein the device is adapted to be applied to a fibrous material web.   The guide element (7) is disposed in a coating apparatus, and the coating apparatus uses an excessive coating medium such as a known blade coating apparatus (6) or a film coating apparatus. 10. A device according to any one of claims 1 to 9, adapted to be applied to a fibrous material web.   11. The device according to claim 1, wherein the guide element (7) is arranged upstream and / or downstream of the coating device.

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