JP3173226U - Curtain coating equipment - Google Patents

Abstract

A curtain coating apparatus having a simple configuration is provided.
A curtain coating head (3) includes a movable lip, and the lip is downstream of at least one slit outlet (6) in the flow direction of the coating medium (M) flowing out from the at least one slit outlet (6). And a partial area of the slide surface 7 that extends to the separation edge 8, and the partial area is coplanar with the remaining slide surface 7 or connected to the remaining slide surface 7 without a step However, the partial area of the lip or slide surface 7 extends over the entire width of the coating head 3 and can be adjusted as follows: a curtain 9 falling from the separating edge 8 is covered in the operating position I It can be adjusted to be directed to the fibrous material web 2 to be directed or to the collection tank 12 in the start / stop position.
[Selection] Figure 1

Description

  The present invention relates to a curtain coating apparatus for coating a paper web, cardboard web or another fiber material web running on at least one coating medium in a liquid to paste form, the curtain being disposed above the fiber material web With a coating head, the width of the curtain coating head at least corresponding to the width of the fiber material web, the curtain coating head having at least one coating media chamber with a supply gap extending from the coating media chamber. And the supply gap transitions to a slit outlet for the coating medium to be supplied, and the curtain coating head has a slide surface on the surface, the slide surface being at least one slit outlet or most Starting from the slit outlet located above, it extends to the separation edge, from which the coating medium configured as a single-layer or multi-layer curtain A collection device, in particular a trap, for collecting a single or multilayer curtain at the start or stop stage of the coating process, in which a single layer or a multilayer coating layer is formed, approximately falling according to gravity on the fibrous material web. It relates to what has a collection tank.

  Such a device is known from WO 03/049871. This document discloses a coating head, and a plurality of coating media or multilayer coating media are supplied using the coating head. The curtain coating apparatus having such a configuration is known from European Patent Application No. 1255615 in particular, and is referred to as “Slide Die”, that is, a slide coating machine, among experts. A so-called slide applicator, also called a cascade applicator, comprises at least one coating media chamber of up to 11 through a supply gap through which the media transitions from a coating media chamber to a slit-shaped outlet. Reach the slide surface of the slide applicator. The coating medium flowing out from the outlet or the outlet slit arranged in parallel with each other overlaps on a slide surface provided on the surface of the coating head. The membrane layer or multilayer membrane layer separates along the outlet edge, also called the peeling edge or separation line, and falls as a single-layer or multilayer curtain first onto the intervening guide plate or directly coated Falls on the surface of the support or the running fiber web.

  In order to start, stop or interrupt the coating process, it is necessary to have a collection device for curtains that have already fallen or curtains that will fall or flow coating media, so that the fiber material web and the surroundings are coated on the coating media. Will not be polluted. The collecting device formed as a tank or groove can be adjusted (displaced) and requires a drive for this purpose. At the start of the coating process, the collecting device is displaced and the curtain is free to reach the fibrous material web. Both curtain edges are each guided by special side guides. In so-called “inboard” travel (the curtain is narrower than the web width), the spacing between both side guides is smaller than the width of the fiber material web. The bath required at the start and stop or interruption of the coating process must therefore be narrower than the aforementioned spacing between the edge guides. In an “overboard” run (where the curtain is fed beyond the web edge), the spacing between the edge guide elements or side guides is greater than the fiber material web width.

  The starting / stopping process using the collection device is particularly difficult in inboard traveling because it is necessary to guide the tank used as the collection device between the edge guide elements.

  When switching to another traveling (especially switching from inboard to onboard traveling), it is necessary to change the equipment of the collection tank, which is extremely troublesome.

  Due to the drawbacks in the coating stage, in many cases the so-called “Teekanneffekt” (teapot phenomenon) occurs. This causes the curtain to deviate from the vertical line starting from the separation edge. Therefore, curtain deflection is inconvenient because the arrival line of the curtain to the fiber material web cannot be defined geometrically.

  A curtain coater is known in the pamphlet of WO 2006/008336. In this curtain coater, in order to solve the above-mentioned problem, the coating head arranged on the frame rotates around the axis, thereby covering the curtain coater. Curtain arrival position is adjusted for operation or start / stop phase or collection. This is extremely troublesome because it is necessary to perform a new positioning every time the entire coating head is adjusted.

  Accordingly, an object of the present invention is to provide a coating apparatus or a curtain coating apparatus with a simple configuration that does not have the disadvantages of the background art.

  This problem is solved by a curtain coating apparatus having the configuration described in the characterizing portion of claim 1.

  According to the present invention, the curtain coating head includes a movable lip, and the lip is disposed downstream of the at least one slit outlet in the flow direction of the coating medium flowing out from the at least one slit outlet. And forming a partial area of the slide surface that extends to the separation edge, the partial area being coplanar with the remaining slide surface or connected to the remaining slide surface without a step, and a lip or slide surface The partial area of the coating extends over the entire width of the coating head and can be adjusted as follows: the curtain falling from the separating edge is directed or started to the fibrous material web to be coated in the operating position Adjustable to be directed to the collection tank at the stop position.

  According to a preferred embodiment of the adjustable lip, the lip consists of a rotationally symmetric body and end members that extend tangentially apart. The rotationally symmetric lip extending to the separating edge and the outer surface of the end member form an adjustable, partial area of the slide surface of the curtain coating head as described above.

  The rotationally symmetric body that forms the partial area of the sliding surface is accommodated in the hole of the curtain coating head so that it can be pivoted accurately, which position the separating edge occupies and which arrival position the curtain has. Depending on whether it occupies, the body, together with the end member, can be adjusted or rotated clockwise or counterclockwise in an angular range of up to 110 °. The holes and the rotationally symmetric body are made with high precision in order to function normally.

  With such an embodiment, a particularly fine adjustment of the lip is realized.

  According to another aspect of the present invention, the lip can be formed in a strip shape. At that time, the lip is accommodated in the rectangular recess of the curtain head, and is arranged to be retractable and advanceable. Depending on whether the lip is advanced and how much the lip is advanced, the arrival point of the curtain for coating the fiber material web is adjusted or the curtain is collected at the start or stop stage.

  The linear adjustment can be easily performed, while the adjustment by the rotationally symmetric body can be finely realized as described above.

  In general, according to the advantages of the present invention, the flexibility of the lip not only avoids the disadvantageous “teapot phenomenon”, but also optimizes the start / stop phase of the coating process in both inboard and overboard travel.

  The adjustment of the lip can be carried out simply, preferably motorized.

  The present invention is particularly suitable for use in multi-layer coating because a multi-layer coating requires a large number of devices to operate the coating apparatus. The present invention is suitable because the separation edge can be displaced more easily than before.

With respect to the background art, the configuration according to the present invention has a great effect.
By simple adjustment of the lip, the curtain arrives at the fiber material web to be coated, or curtains that have already fallen or fall in the future are collected in a collection device, for example a collection tank.
A horizontal or vertical adjustment of the lip or separation line can be made, whereby an adverse teapot phenomenon is avoided or at least corrected;
The arrival point of the curtain is easily adjustable, so that the distance between the supplied single-layer or multilayer curtain and the upstream boundary air layer removal device is adjusted and optimized;
-Furthermore, it is possible to introduce and / or control a start phase or a stop phase more easily than in the past, and a short interruption of the media flow can also be realized.
It is also possible to change the moving speed of the at least one liquid membrane layer just before the separation edge. This is suitable when the viscosity of the coating medium is high. At that time, it is necessary to select a large rib angle. At low viscosity, a relatively small lip angle is adjusted depending on the purpose.

  Further advantages of the invention are apparent from the dependent claims.

  The present invention will be described in detail below based on the illustrated embodiment.

It is a figure which shows the curtain coating apparatus provided with the curtain coating head by background art. It is a figure which shows the curtain coating apparatus for multilayer coating by this invention. It is a figure which shows another embodiment of the curtain coating apparatus for multilayer coating by this invention. It is a figure which shows another embodiment of the curtain coating apparatus for multilayer coating by this invention. It is a figure which shows another embodiment of the curtain coating apparatus for multilayer coating by this invention. It is a figure which shows another embodiment of the curtain coating apparatus for multilayer coating by this invention.

  In each figure, the same components are denoted by the same reference numerals. For each drawing, only the differences with respect to the preceding drawing are mentioned.

  FIG. 1 shows a curtain coating device 1 for coating a traveling paper web, cardboard web or another fibrous material web 2 according to the background art during a coating operation marked with I. The curtain coating device 1 comprises a curtain coating head 3 which is arranged above the fiber material web 2 and spaced from the fiber material web 2, the curtain coating head 3 being the fiber material web to be coated. 2 at least as wide. Such a configuration is also referred to as a machine width configuration. The coating head 3 used here is also called a so-called cascade coating machine or a slide coating body.

  The coating head 3 is provided with a supply gap 5 for multi-layer coating, i.e. for liquid coating media M set up each time (up to 11 coating media of the same or different types can be applied). Each of the supply gaps 5 is provided on the surface of the curtain coating head 3 to a slit outlet 6 as a nozzle portion extending continuously in the width direction. Transition. The coating head 3 includes a slide surface 7 that is inclined downward and curved on the surface. The slide surface 7 transitions to a separation edge or separation edge 8, and the separation edge or separation edge 8 extends downward. The separation edge 8 has the same machine width as the coating head 3, and the film layers F1 and F2 previously formed along the slide surface 7 and separated from each other are separated from the separation edge 8 so as to be free. To form a single-layer or multilayer curtain 9. The curtain 9 falls from the separating edge 8 to the fibrous material web 2 substantially in accordance with gravity, and is placed on the fibrous material web 2 as a desired coating layer or layers 10.

  The curtain coating apparatus 1 in the coating operation is entrained together with a web 2 that travels at a high speed in addition to some units (not shown) such as edge guide elements for curtains, measuring devices, supply pipes, and the like. Boundary air layer removal device 11 merely for suggestion, and a coating medium that has already dropped or will fall in the beginning or stop phase of the coating process. The collection device comprised as the collection tank 12 for a vehicle is provided.

  The coating device 1 has a slit outlet 6 and a separating edge 8 of a slide surface 7 having an invariant geometric shape. Therefore, in order to obtain a specific arrival position P of the single-layer or multi-layer curtain 9, a troublesome adjustment of the outlet body or the entire coating head is necessary.

  2 and 3 show an embodiment of a coating head 3 according to the present invention.

  As shown in FIG. 2, the curtain coating head 3 includes a movable lip 13. The lip 13 is disposed on the downstream side of the at least one slit outlet 6 in the flow direction R of the coating medium M flowing out from the at least one slit outlet 6, and extends to the separation edge 8. 7 partial areas 14 are formed. The partial area 14 is flush with the remaining slide surface 7 or smoothly connected to the slide surface 7 without a step. The adjustable partial area 14 of the lip 13 or the slide surface 7 extends over the entire width of the coating head 3 and can be adjusted as follows: a curtain falling from the separating edge 8 (here 2 9), which is a layer, can be adjusted to be directed to the operating position I, that is to the fibrous material web 2 to be coated in the coating operation, or to the collecting tank 12 in the start-stop position II. Depending on which position I or position II is desired, the lip 13 is adjusted clockwise or counterclockwise. As can be seen from FIG. 2, the lip 13 consists of a rotationally symmetric body 13.1 and an end member 13.2 which extends tangentially apart, the body 13.1 and the end member The outer surface of 13.2 partly forms a partial area 14 of the sliding surface 7 up to the separating edge 8.

  The rotationally symmetric body 13.1 is rotatably accommodated in the hole 15 of the curtain coating head 3. As shown by the curved arrows in FIG. 2, the body 13.1 including the end member 13.2 can be adjusted or rotated in an angle range of up to about 110 ° in the clockwise or counterclockwise direction. .

  FIG. 3 shows another embodiment of the movable lip 13 here designated by 13.3.

  In this embodiment, the lip 13.3 is formed in a strip shape and is accommodated in the rectangular recess 16 of the curtain head 3, and is straight as shown by a double arrow V in the recess 16. Can be withdrawn and advanced. FIG. 3 shows the start / stop position II with the lip 13.3 advanced. In FIG. 3, the collection tank 12 collects the two-layer curtain 9 composed of the illustrated film layers F1 and F2. In the retracted position of the lip 13.3 not shown, the curtain arrives on a fiber material web not shown.

  FIG. 3a shows an embodiment different from FIG. Instead of guiding the strip-shaped lip 13.3 in the recess 16, a linear guide body 17 is provided here, and the lip 13 slides along the linear guide body 17.

  Here, there is a problem that a free gap 18 is generated between the curtain coating head 3 and the movable lip 13. If this gap is closed with a coating medium (for example paint), new adjustments, in particular the return movement of the lip 13.3, become difficult and in some cases impossible. Therefore, the protective cover 19 is provided, and the gap 18 is covered by the protective cover 19 from above. The protective cover 19 may be a separate component, as can be seen from FIG. 3a. The protective cover 19 may be formed integrally with the coating head 3, as can be seen from FIG. 3b.

  In the embodiment shown in FIG. 4, the protective cover 19 is also provided at the start / stop position II and the operating position I, in which the adjustable lip 13.3 is pivoted. For this purpose, the lip 13.3 is pivotally attached to the holder body 20 and can be swiveled up to 90 ° by means of an adjusting device 21, for example a reciprocating cylinder. The swirl is indicated by a dashed line and a curved double arrow. The greater the length of the swivelable lip shown, the smaller the swivel angle. Similarly, the smaller the swivel angle, the smaller the problem of operation of the coating medium along the separation edge.

  In the embodiment shown in FIGS. 3 a and 4, the protective cover 19 is in contact with the adjustable lip 13 or holder body 20 while being preloaded. This improves the sealing action. In some cases, dirt generated may be removed naturally from the lip 13 because the edge 19a of the protective cover 19 acts like a scraper when the lip 13 is adjusted.

  DESCRIPTION OF SYMBOLS 1 Curtain coating apparatus, 2 Textile material web, 3 Curtain coating head, 4 Coating medium chamber, 5 Supply gap, 6 Slit outlet, 7 Sliding surface, 8 Separation edge, 9 Curtain, 10 Coating layer, 11 Boundary Air layer removal device, 12 collection device or collection tank, 13 movable lip, 13.1 rotationally symmetric body, 13.2 end member, 13.3 strip lip, 14 partial area of slide surface, 15 holes, 16 recesses, 17 linear guide body, 18 free gap, 19 protective cover, 20 holder body, 21 adjusting device, F1, F2 film layer, LG boundary air layer, M coating medium, P arrival position, R flow Direction, I Operation position, II Start / stop position

Claims (8)

A curtain coating device for coating a traveling paper web, cardboard web or another fibrous material web (2) with at least one coating medium (M) from liquid to paste,
A curtain coating head (3) disposed above the fibrous material web (2), wherein the width of the curtain coating head (3) corresponds at least to the width of the fibrous material web (2); The head (3) has at least one application medium chamber (4) with a supply gap (5) extending from the application medium chamber (4), the supply gap (5) being the application gap to be supplied. Moving to the slit outlet (6) for the working medium (M), the curtain coating head (3) has a slide surface (7) on the surface, and the slide surface (7) has at least one slit. Starting from the outlet (6) or the uppermost slit outlet (6) and extending to the separation edge (8), from the separation edge (8) is configured as a single-layer or multilayer curtain (9) Coating medium (M) is almost in accordance with gravity For falling onto the fibrous web (2), where a single-layer or multilayer coating layer (10) is formed, for collecting the single-layer or multilayer curtain (9) at the start or stop stage of the coating process In a collection device, particularly one equipped with a collection tank (12),
The curtain coating head (3) comprises a movable lip (13), which is at least as viewed in the flow direction of the coating medium (M) flowing out of the at least one slit outlet (6). A partial area (14) of the slide surface (7) arranged downstream of one slit outlet (6) and extending to the separation edge (8) is formed, the partial area (14) being the remaining slide The surface (7) is flush with or connected to the remaining slide surface (7) without any step, and the lip (13) or the partial area (14) of the slide surface (7) is applied to the coating head (3 ) And adjustable as follows: the curtain (9) falling from the separating edge (8) on the fibrous material web (2) to be coated in the operating position (I) Directed or to start / stop position (II) There are to be directed to a collecting tank (12), characterized in that it is adjustable, curtain coating apparatus.   The lip (13) comprises a rotationally symmetric body (13.1) and an end member (13.2) extending tangentially apart, the outer surface of the lip (13) being partially 2. The curtain coating device according to claim 1, wherein the curtain coating device forms a partial area (14) of the slide surface (7).   The body (13.1) forming the partial area (14) of the slide surface (7) is rotatably accommodated in the hole (15) of the curtain coating head (3), and the body (13.1) 3. Adjustable or pivotable together with the end member (13.2) in a clockwise or counterclockwise direction in an angular range of up to 110 °, preferably up to 90 °. Curtain coating equipment.   The curtain coating device according to claim 1, wherein the lip (13) is linearly movable.   The lip (13) is formed in a strip shape (13.3) and is received in the rectangular recess (16) of the curtain head (3) and can be retracted and advanced linearly from claim 1 The curtain coating apparatus according to any one of 4 to 4.   6. Curtain coating device according to any one of the preceding claims, wherein the adjustable lip (13, 13.3) is made of special steel or plastic, for example Teflon.   A protective cover (19) is provided by which a free gap (18) exists between the adjustable lip (13, 13.3) and the at least one slit outlet (6). The curtain coating apparatus according to any one of claims 1 to 6, wherein can be covered.   8. Curtain coating device according to claim 7, wherein the protective cover (19) is a protrusion and contacts the adjustable lip (13.3) and / or the holder body (20) holding the lip (13).

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