Crescent-shaped former for manufacturing tissue paper

Abstract

The present invention relates to a crescent-shaped former for manufacturing tissue paper, the former comprising a forming section (A), a pressing section (B) and a drying section (C), wherein the crescent-shaped former further comprises a felt fabric (41) for carrying pulp from a forming press area (15) of the forming section (A) to a pressing press area (22) of the pressing section (B), and the felt fabric (41) is configured to carry the pulp to the pressing press area (22), where the pulp is transferred to the drying section (C), wherein the felt fabric (41) is further configured to return from the pressing press area (22) to the forming press area (15) in a return section (D), so that the felt fabric (41) forms an annular ring, wherein the return section (D) comprises a cleaning station (42), at least a portion of which is arranged in the negative machine direction (-MD) relative to the center line (R) of the forming roller (12).

Description

Technical Field

[0001] The invention relates to a crescent-shaped former for manufacturing household paper. The crescent-shaped former comprises a forming part, a pressing part and a drying part. Background Art

[0002] The crescent former is usually used to manufacture tissue paper and generally includes a forming section, a pressing section and a drying section. In the forming section, a pulp with a high water content is applied to a forming fabric in a forming nip and transported to a pressing nip, where the pulp is transferred to a drying section, which usually includes a Yankee dryer for drying the pulp to manufacture tissue paper.

[0003] Although the crescent former is effective and reliable, manufacturing tissue paper in this way requires a lot of space and is particularly troublesome when retrofitting new parts in an existing crescent former or when replacing an old former with a new one. Due to the complexity of the papermaking process, it is not simple to change the function or design of the crescent former while maintaining operational stability and the desired quality of the tissue paper manufactured. Currently, none of the prior art solutions proposes a solution that allows significant space savings.

[0004] Therefore, further development is needed in this area. Summary of the invention

[0005] The object of the present invention is to eliminate or at least minimize the above mentioned problems. This is achieved by a crescent former according to the present disclosure.

[0006] The crescent former according to the present invention comprises a forming section, a press section and a drying section, wherein the forming section comprises a breast roll and a forming roll, a forming wire and a headbox for injecting the slurry into a forming nip formed between the breast roll and the forming roll. The press section comprises a press roll, and the drying section comprises a Yankee roll, which is arranged to form a press nip with a press roll of the press section, wherein the press nip is arranged in a positive machine direction relative to the forming nip. In addition, the crescent former comprises a felt fabric for carrying the slurry from the forming nip to the press nip, and the felt fabric is configured to receive the slurry from the headbox and press against the forming wire in the forming nip. The felt fabric is also configured to separate from the forming wire after the forming nip and carry the slurry to the press nip, where the slurry is transferred to the Yankee roll. Moreover, the felt fabric is constructed to return from the pressing zone to the forming zone in a return section so that the felt fabric forms an annular loop, and the return section includes a cleaning station so that at least a portion of the cleaning station is arranged in a negative machine direction relative to the center line of the forming roller, and the negative machine direction is the direction opposite to the positive machine direction.

[0007] By configuring the crescent former so that at least part of the cleaning station is arranged in the negative machine direction relative to the center of the forming roll, a significantly more compact crescent former is achieved. This allows the overall length of the crescent former to be shorter, resulting in a significantly more cost-effective crescent former due to the smaller space required. However, the operation of the crescent former remains as efficient and reliable as the formers of the prior art, so the present invention does not risk reducing the manufacturing speed or reducing the quality of the finished tissue.

[0008] Suitably, the felt fabric is arranged so that, when the felt fabric returns from the press nip to the forming nip, it passes in the return section over a breast roll and a headbox located on the upper level of the former. Thus, a cleaning station can be placed above the forming section and it is convenient to transport the felt fabric to the cleaning station.

[0009] Furthermore, the return section may comprise a tensioning station arranged in the negative machine direction with respect to the centre line of the forming rollers of the forming section. Thus, the overall length of the crescent former may be further reduced and a combination of at least a part of the cleaning station with the tensioning station may be achieved, thereby making it possible to form an even more compact and efficient crescent former.

[0010] Suitably, the crescent former further comprises a tray for collecting water from the tensioning station, said tray being arranged below the tensioning station but above the forming roller. Thus, liquid and fibers removed from the felt fabric can be prevented from ending up on other parts of the crescent former. More particularly, the forming wire can be protected from said liquid and fibers, so that the forming wire can be kept clean, and contamination of the pulp in the forming section can be prevented. This is particularly advantageous in preventing spots or streaks in the finished tissue paper caused by such contamination, so that a high quality end product can be achieved.

[0011] The crescent former may further comprise a first guide roller for guiding the felt fabric from the press nip to the cleaning station. Thus, the felt fabric may be guided to travel over the forming section and to the cleaning station without the felt fabric contacting the press section, the forming section or the drying section on its way from the press nip to the cleaning station. Suitably, the crescent former further comprises a second guide roller for guiding the felt fabric from the first guide roller to the cleaning station, wherein the first guide roller contacts the paper side of the felt fabric and the second guide roller contacts the back side of the felt fabric. This further improves the guiding of the felt fabric from the press nip to the cleaning station, such that the felt fabric is efficiently transported without the risk of undesired contact with any other part of the crescent former.

[0012] Furthermore, the crescent-shaped former suitably comprises a cover arranged to at least partially enclose the cleaning station to prevent washing liquid from escaping from the scrubber. This advantageously prevents liquid and fibres removed from the felt fabric during washing from contacting other parts of the crescent-shaped former and also prevents liquid and fibres from ending up on the floor or other parts of the space in which the crescent-shaped former is arranged. This in turn helps to prevent damage and reduce the risk of accidents to personnel working around or near the crescent-shaped former.

[0013] Numerous other benefits and advantages of the present invention will be readily apparent to those skilled in the art from the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will now be described in more detail with reference to the accompanying drawings, in which:

[0015] FIG1 discloses a crescent-shaped former according to the prior art in side view; and

[0016] Figure 2 A crescent-shaped former according to the invention is disclosed in a side view.

[0017] All drawings are schematic, not necessarily to scale, and generally show only parts necessary for explaining the respective embodiments, while other parts may be omitted or merely suggested. Unless otherwise indicated, any similar reference numerals appearing in multiple figures refer to the same object or feature in all figures. DETAILED DESCRIPTION

[0018] 1 will be described according to the prior art crescent-shaped former 1 ', then refer to Figure 2 A crescent former according to a preferred embodiment of the present invention is described. This serves to clearly distinguish the present invention and its contribution to the prior art, and where parts of the present invention are similar to parts of the prior art, they will be indicated by similar reference numerals, with the prior art being distinguished by a superscript.

[0019] When the terms "before" and "after" are used in this document, this will be interpreted as upstream and downstream, respectively, relative to the moving part of the crescent former 1, 1'. For tissue paper manufactured in a crescent former 1, 1', this means that "before" refers to reaching another part that is considered "after" after passing through one part of tissue paper manufacturing, that is, "before" involves something being located upstream of something else, from the perspective of the movement of the web. For a fabric, such as a forming wire or a felt fabric, "before" refers to the point at which a given point on the fabric is located at a first point in time, while "after" refers to the point at which the same point on the fabric is located at a second point in time, which is after the first point in time, but before the fabric completes a full cycle and reaches again the point at which it was located at the first point in time. For a crescent former, this means that the felt fabric passes through the pressing section after the forming section but before the return section.

[0020] Thus, FIG. 1 discloses a crescent former 1' according to the prior art, in which tissue paper is manufactured by injecting a stock from a headbox 11' into a forming nip 15' to form a web, and delivering the web from a forming section A to a press section B on a first fabric 41' (also referred to as a felt fabric), where the stock is transferred to a Yankee roll 31' of a drying section C in a press nip 22'. A Yankee roll may also be referred to as a Yankee dryer or a Yankee dryer. After being removed from the Yankee roll 31' by a creping blade 32', the web or tissue paper 51' may proceed through additional processing steps 51' in a dry end E before being wound on a reel 52' to form a finished product.

[0021] In the prior art crescent former 1', the web is formed in the forming nip 15' by a slurry comprising a mixture of water and fibers, which is ejected at high speed from the headbox 11', and the ejected slurry is captured between the felt fabric 41' and the second fabric 14' (or forming wire 14'). The forming wire 14' forms an endless loop in the forming section A. The forming nip 15' is formed between the forming roll 12' and the breast roll 13', and the forming wire 14' is separated from the felt fabric 41' after the forming nip 15' and is cleaned before returning to the forming nip 15'.

[0022] In the press section B, the felt fabric 41 ′ is guided to the press nip 22 ′ by a series of guide rolls 23 ′, and the press nip 22 ′ itself is formed by the press rolls 21 ′ and the Yankee dryer 31 ′ of the dryer section C.

[0023] The felt fabric 41' forms an endless loop from the forming nip 15' of the forming section A to the pressing nip 21' of the pressing section B and returns to the forming nip 15' via the return section D. In the return section D, the felt fabric 41' is cleaned in a cleaning station 42', which includes a felt tensioning roller 43' and a cleaning nozzle 44', which sprays a washing fluid into a washing nip 46' formed between the felt fabric 41' and the felt tensioning roller 43'. After the felt tensioning roll 43', where the washing fluid is squeezed into the felt fabric 41', high-pressure water cleaning nozzles 47' spray the washing fluid on the paper side of the felt fabric 41', and a plurality of suction boxes 45' are arranged after the cleaning nozzles 47' to dewater the felt fabric 41' and remove any remaining fibers from the web which may still adhere to the felt fabric 41' after the web has been transferred to the Yankee dryer 31' in the pressing nip 22'. Subsequently, the felt fabric 41' is cleaned and returned to the forming nip 15' via a guide roll 48'. A tensioning station 49' is also provided in the return section D, which is usually arranged together with the felt tensioning roll 43' and serves to stretch the felt fabric 41' to achieve uniform tension. In some crescent formers the tensioning station 49' is separate from the washing station 42', but they are usually arranged to wash and stretch the felt fabric 41' after the web has been transferred to the drying station C but before it returns to the forming nip 15'.

[0024] In the crescent former 1', the positive machine direction MD (or simply machine direction MD) is defined as the direction from the forming section A to the drying section C, so that when the web advances through the crescent former 1' from the forming press 15' to the drying section C and then to the dry end E, the web travels in the positive machine direction MD. The negative machine direction -MD is the direction opposite to the machine direction MD. The length of the crescent former 1' is defined as the distance from one end of the crescent former 1' to the other end of the crescent former 1' in the dry end E. Typically, the length of the crescent former 1' according to the prior art is about 34m, and the height of the crescent former 1' from the floor on which the crescent former 1' is placed to the highest point of the crescent former 1' is about 10-11m. The highest point is usually in the drying section C.

[0025] Now refer to Figure 2 Description of the Invention As already mentioned above, parts of the crescent-shaped former 1 which are similar in form and / or function to those of the crescent-shaped former 1 ' of the prior art will be indicated by the same terms and reference numerals.

[0026] exist Figure 2, the web is delivered from left to right in the positive machine direction, and each point on the forming wire 14 performs a clockwise rotation from the forming nip 15 and rotates through the guide roller 23 in order to return to the forming nip 15 again. Each point on the felt fabric 41 sequentially performs a counterclockwise movement from the forming nip 15 to the pressing nip 22 and from the pressing nip 22 to the washing station 42, and then turns to a clockwise movement from the washing station 42 to the forming nip 15 via the guide roller 48. It should be noted that Figure 2 The crescent former 1 of the present invention may alternatively be a mirror image so that the web, forming wire 14 and felt fabric 41 instead move in opposite directions, and it will be readily appreciated by those skilled in the art that such a mirror image will provide the same benefits as the present invention. Figure 2 The crescent-shaped former 1 shown has basically the same structure and technical effect.

[0027] In the forming section A, the stock is sprayed from the headbox 11 into the forming nip 15 formed between the forming roll 12 and the breast roll 13. The stock is formed into a web between the first fabric 41 (or felt fabric 41) and the forming wire 14 in the forming nip 15, and after the forming nip 15, the forming wire 14 is separated from the web and the felt fabric 41. Subsequently, the forming wire 14 returns to the forming nip 15 in the form of an endless loop and may undergo cleaning during its return.

[0028] The felt fabric 41 carrying the web is guided on the guide roll 23 and advances from the forming section A to the press section B and enters the press nip 22 formed between the press roll 21 and the Yankee roll 31 of the drying section C. Before reaching the press nip 22, the felt fabric 41 also passes through the dewatering roll 24 (also called a suction roll) and dewaters the web before the web reaches the press nip 22. After the press nip 22, the web is transferred to the Yankee roll 31 and dried, and then removed from the surface of the Yankee roll 31 by the creping blade 32. Subsequently, the web or tissue paper 53 advances in the dry end E and reaches the reel 52 in a similar manner to the prior art crescent former 1' of FIG. 1.

[0029] The present invention differs from the prior art mainly in the construction and operation of the return section D, where the felt fabric 41 is treated during its return from the press nip 22 to the forming nip 15. Therefore, after the press nip 22, the felt fabric 41 is guided to a cleaning station 42, which is arranged at least partially in the negative machine direction - MD relative to the center line R of the forming roll 12. Therefore, since the return section D is not completely placed between the forming section A and the press section B, but is placed above the forming section A, the space in and around the crescent former 1 is used more efficiently, thereby achieving a more compact crescent former 1. The total length of the crescent former 1 according to the present invention is only about 27m in this preferred embodiment, but can be even shorter in other embodiments. At the same time, the height of the crescent former 1 remains substantially the same as the height of the crescent former 1' of the prior art, i.e. about 10-11m, because even when the return section D is placed above the forming section A, it does not extend higher than the drying section C of the conventional crescent former 1'.

[0030] Therefore, in Figure 2 In a preferred embodiment of the felt fabric 41 is guided from the pressing nip 22 to a return portion D, optionally by a first guide roller 61 and / or a second guide roller 62, to reach an upper layer of a retaining structure 65 on which the return portion D is at least partially arranged. The provision of guide rollers 61, 62 is advantageous for further providing a crescent-shaped former 1 of a shorter length than known in the prior art. Suitably, the first guide roller 61 contacts the felt fabric 41 on the paper side and the second guide roller 62 contacts the felt fabric 41 on the back side, so as to achieve a compact and efficient way of guiding the felt fabric 41 to the washing station 42. By Figure 2 Arranging the first guide roller 61 and the second guide roller 62 as shown, i.e. the first guide roller contacts the felt fabric 41 on the paper side and the second guide roller contacts the felt fabric 41 on the back side or roller side, enables a particularly compact and efficient guidance of the felt fabric 41 to the return D. This allows the felt fabric 41 to be brought to the second level 66 of the holding structure 65 at a steep upward angle after the first guide roller 61 and to be turned into a substantially horizontal direction after the second guide roller 62, so that the felt fabric 41 reaches the cleaning station 42 substantially horizontally. Alternatively, the felt fabric 41 can reach the cleaning station 42 at a certain angle to the horizontal.

[0031] Similar to the prior art, the washing station 42 may include cleaning sprays 44, followed by a felt tensioning roller 43 and a washing nip 46 formed by the felt fabric 41 against the felt tensioning roller 43. At the felt tensioning roller 43, the felt fabric 41 is appropriately rotated so that its direction of movement changes from the negative machine direction -MD to the positive machine direction MD, and after the felt fabric 41 rotates on the felt tensioning roller 43, the felt fabric may be subjected to the action of cleaning sprays 47, followed by a plurality of suction boxes 45. The suction boxes (or vacuum boxes) 45 may be Uhle boxes, but other devices for generating vacuum known in the art may also be used. It should be noted that the washing station 42 may include only some of the components mentioned herein, and additional cleaning may also be performed by additional components of the washing station, as long as they are capable of removing residues of the web from the felt fabric 41, so that the felt fabric is suitable for receiving the slurry again at the forming nip 15.

[0032] According to the invention, at least a portion of the washing station 42 is arranged in the negative machine direction - MD relative to the center line R (which extends in the vertical direction through the forming roll 12), and appropriately, at least the felt tensioning roll 43 and the components arranged directly in connection with the felt tensioning roll 43 (such as the cleaning nozzles 44 and / or the high-pressure water cleaning nozzles 47') are arranged in this way. This is advantageous when the felt tensioning roll 43 provides a turning of the felt fabric 41 so that the turning from the negative machine direction - MD to the positive machine direction MD occurs above the forming station A and in the negative machine direction - MD compared to the center R of the forming roll 12. In some embodiments, other parts of the washing station 42 or indeed the entire washing station 42 may also be arranged in the negative machine direction - MD relative to the center R of the forming roll.

[0033] Guide rollers 48 for guiding the felt fabric 41 from the cleaning station 42 to the forming nip 15 of the forming section A may also be arranged in the return section D as appropriate.

[0034] The holding structure 65 of the crescent former 1 thus provides an upper layer 66 in which at least a portion of the return section D is arranged and which extends at least partially above the forming section A. The upper layer 66 may be arranged at any suitable height above the forming section A, but advantageously leaves enough space above the headbox 11 to allow maintenance and also allow other components to be arranged near the headbox 11. In some embodiments, the upper layer 66 may be arranged in steps so that the components in the upper layer 66 are placed at different heights in the crescent former 1. However, advantageously, the components on the upper layer 66 do not extend above the drying section C, so that an increase in the overall height of the crescent former 1 can be avoided.

[0035] Similar to the prior art, a tensioning station 49 can be arranged in the cleaning station 42 and is shown in the figures together with a felt tensioning roller 43, so that the felt fabric 41 is tensioned during cleaning. In a preferred embodiment, the tensioning station 49 is at least partially placed in the negative machine direction - MD relative to the center R of the forming roller, and this is advantageous because it contributes to the compact design of the crescent former 1. However, in other embodiments, the tensioning station 49 can alternatively be placed in the positive machine direction MD compared to the center R of the forming roller, and the tensioning station can also alternatively be placed together with the forming section A and the press section B in a layer of the holding structure 65 below the upper layer 66.

[0036] In some embodiments, the tensioning station 49 may be placed in the negative machine direction - MD of the center R of the forming roll 12, and the felt tensioning roller 43 may be disposed before the tensioning station 49 or after the tensioning station 49. In such embodiments, the tensioning station 49 may include a tensioning roller that forms a turning point for the felt fabric 41 on the upper layer 66.

[0037] Washing of the felt fabric 41 is performed by applying a washing fluid to the felt fabric 41 as described above. In a preferred embodiment, the washing fluid is water, but alternatively, the washing fluid may include a detergent mixed with water so that it may be formed of a detergent that does not need to be diluted with water. It should be noted that when reference is made herein to a washing fluid, a cleaning fluid / liquid, or water, it should be interpreted as any liquid or fluid suitable for cleaning the felt fabric 41 in a crescent former.

[0038] In the return section D, the felt fabric 41 is thus arranged to pass over the forming roller 12 and preferably also over the other parts of the forming section A located on the upper layer 66 of the holding structure 65. This is one of the main advantages of the present invention and enables a compact design of the crescent former 1 while still providing all the components required for the desired operation of the crescent former 1, so that tissue can be manufactured with the desired quality and the desired manufacturing speed.

[0039] The cleaning station 42 of the preferred embodiment suitably comprises a tray 64 for collecting water or liquid from the washing station 42. Suitably, the tray 64 is arranged below at least a part of the washing station 42, such as the felt tensioning roller 43, but the tray 64 may alternatively be arranged below the tensioning station 49 and collect water that has been applied to the felt fabric 41 before it reaches the tensioning station 49. By providing the tray 64 in this way, water can be largely prevented from falling from the cleaning station 42 and / or from the tensioning station 49 onto the forming section A and / or onto the floor or other structures in the vicinity of the crescent former 1. It is particularly advantageous that the tray 64 collects water or washing fluid / liquid, thereby preventing contamination of the forming wire 14, as any water and / or fibers falling onto the forming wire 14 would risk significantly reducing the quality of the tissue produced by the crescent former 1 by forming streaks or spots on the web being processed to form tissue.

[0040] The washing station 42 may also include a cover 63, which is arranged to at least partially enclose the washing station 42 so as to capture water or cleaning fluid / liquid and prevent contamination of the forming section A or other parts of the crescent-shaped former 1 or the vicinity of the crescent-shaped former 1. This is beneficial to prevent contamination of the forming wire 14 and also reduces the risk of damage to other parts or injury to personnel working in the area, because the fluid increases the risk of injury from slipping on the ground and because water may cause corrosion or other damage to parts of the crescent-shaped former 1 or other machines nearby. Moreover, by preventing or at least reducing the risk of water, cleaning fluid and / or fibers entering from the crescent-shaped former 1 into undesirable locations in the former 1 and surrounding areas, the need for maintenance and cleaning is reduced. Suitably, the cover 63 is arranged around a portion of the felt tensioning roller 43 and / or the tensioning station 49, but the cover can alternatively be arranged around any other portion of the washing station 42 where water or cleaning fluid is used. In some embodiments, multiple covers 63 can be used and / or a cover 63 that at least partially encloses multiple parts of the cleaning station 42 or the entire cleaning station 42 can be used.

[0041] It should be noted that features from the various embodiments described herein may be combined freely, unless it is explicitly stated that such a combination is inappropriate.

Claims

1. A crescent-shaped former for manufacturing tissue paper, the crescent-shaped former comprising a forming section (A), a pressing section (B) and a drying section (C), wherein: The forming section (A) comprises: Breast roll (13) and forming roll (12), a forming wire (14), and a headbox (11) for injecting slurry into a forming nip (15) formed between the breast roll (13) and the forming roll (12), And wherein, the pressing section (B) comprises: Pressing roller (21), And the drying part (C) comprises: a Yankee roll (31) arranged to form a press nip (22) with a press roll (21) of the press section (B), wherein the press nip (22) is arranged in a positive machine direction (MD) relative to the forming nip (15), The crescent former further comprises a felt fabric (41) for carrying the pulp from the forming press zone (15) to the pressing press zone (22), the felt fabric (41) being configured to receive the pulp from the headbox (11) and to press against the forming wire (14) in the forming press zone (15), and the felt fabric (41) being further configured to separate from the forming wire (14) after the forming press zone (15) and to carry the pulp to the pressing press zone (22), where the pulp is transferred to the Yankee roller (31), wherein the felt fabric (41) is further configured to return from the pressing nip (22) to the forming nip (15) in a return portion (D) so that the felt fabric (41) forms an annular ring, Wherein, the return portion (D) includes a cleaning station (42), and is characterized in that at least a portion of the cleaning station (42) is arranged in a negative machine direction (-MD) relative to a center line (R) of the forming roller (12), and the negative machine direction (-MD) is a direction opposite to the positive machine direction (MD).

2. The crescent-shaped former according to claim 1, wherein: When the felt fabric (41) returns from the pressing zone (22) to the forming zone (15), the felt fabric is arranged to pass over the forming roller (12) located on the upper layer (66) of the crescent former in the return portion (D).

3. The crescent-shaped former according to claim 1, wherein: The return section (D) further comprises a tensioning station (49) arranged in the negative machine direction (-MD) relative to a center line (R) of the forming roller (12) of the forming section (A).

4. The crescent-shaped former according to claim 2, wherein: The return section (D) further comprises a tensioning station (49) arranged in the negative machine direction (-MD) relative to a center line (R) of the forming roller (12) of the forming section (A).

5. The crescent former according to claim 3, further comprising a tray (64) for collecting water from the cleaning station (42), the tray (64) being arranged below a portion of the cleaning station (42) but above the forming roller (12).

6. The crescent-shaped former according to claim 4, wherein: The return section (D) further comprises a tensioning station (49) arranged in the negative machine direction (-MD) relative to a center line (R) of the forming roller (12) of the forming section (A).

7. The crescent former according to any one of claims 1 to 4, further comprising a first guide roller (61) for guiding the felt fabric (41) from the pressing nip (22) to the cleaning station (42).

8. The crescent former according to claim 5, further comprising a second guide roller (62) for guiding the felt fabric (41) from the first guide roller (61) to the cleaning station (42), wherein: The first guide roller (61) contacts the paper side of the felt fabric (41), and the second guide roller (62) contacts the back side of the felt fabric (41).

9. The crescent former according to claim 6, further comprising a second guide roller (62) for guiding the felt fabric (41) from the first guide roller (61) to the cleaning station (42), wherein: The first guide roller (61) contacts the paper side of the felt fabric (41), and the second guide roller (62) contacts the back side of the felt fabric (41).

10. The crescent-shaped former according to any one of claims 1 to 6, further comprising a cover (63) arranged to at least partially close the cleaning station (42) for preventing washing liquid from escaping from the cleaning station (42).

11. The crescent-shaped former according to claim 7, further comprising a cover (63) arranged to at least partially close the cleaning station (42) to prevent washing liquid from leaking out of the cleaning station (42).

12. The crescent-shaped former according to claim 8 or 9, further comprising a cover (63) arranged to at least partially close the cleaning station (42) to prevent washing liquid from escaping from the cleaning station (42).

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