Water feed drum and fiber preparation device

Abstract

A water feed drum (30) with a water supply system (32) for mixing a fiber suspension, preferably dissolved in a dissolving drum (10), with fed-in water, wherein the fiber suspension contains, in particular, fiber with high stock densities in the HC range, such as waste paper, and can be flowed into the water feed drum (30) in an inlet region (320), characterized in that the water supply system (32) comprises at least one water channel (34) with a water receiving chamber (37) and a flow channel (38) adjoining the water receiving chamber (37), wherein the water receiving chamber (37) is arranged in an outlet region (340) and the flow channel (38) opens into a deflection region (39), whereby a labyrinth-like water transport system is formed, in which the water flows from the water receiving chamber (37) into the flow channel (38),flows through the flow channel (38) in a direction opposite to the flow direction of the fiber suspension and is deflected in the deflection region (39) into the flow direction of the fiber suspension.

Description

[0001] The invention relates to a water feed drum for adding water to dilute dissolved fibers, in particular with high consistency in the HC range, and to a fiber processing device for dissolving and sorting fibers.

[0002] Pulping and sorting devices are used for the processing of fibrous materials, especially waste paper. In waste paper pulping systems, in addition to defibrating the cardboard and paper raw materials, the coarse, non-recyclable components contained therein, such as plastics or glass, are also removed from the process, which are referred to as rejects.

[0003] Dissolving devices are used to process fiber raw materials so that they can be used in the form of a fiber suspension, for example, in a machine for producing a fiber web, especially a paper web. The pulp density of the fiber dissolved in the fiber suspension is typically 18-20%. After dissolving, the fiber-containing suspension is sorted using wet screening to retain non-fiber contaminants on a screen due to their size and then separate them. The usable fibers can then pass through the screen openings as acceptable material with a portion of the water.

[0004] Due to changes in the composition of waste paper caused by a significant increase in the reject rate and the recycling rate, a pulping drum is increasingly being used for the pulping and initial coarse sorting of fibers. Sorting drums with a perforated drum body are used to sort the pulped fibers. These drums are characterized by low maintenance costs, low wear, ease of operation, and the separation of raw materials that are difficult to dissolve. For sorting, the fiber suspension is further diluted with water to separate the fiber from the contaminants. Water is added to the sorting drum by means of a spray pipe arranged axially on the outer side of the sorting drum and feeds water into the perforated drum body via a plurality of nozzles. Inside the drum body, the fiber is then diluted and subsequently washed out.During the rotation of the drum body, the water is either reflected on the inner surface of the drum body or runs through the perforations and is collected in a receiving container.

[0005] For efficient screening, a fiber density of less than 10% in the fiber suspension is required. However, to achieve a reduction of the initial fiber density of the fiber suspension from 18-20% at the entrance to the screening drum to 10-12%, a screening drum length of several meters is required. This means that the entire surface of the screening drum is not optimally utilized.

[0006] EP 3 892 773 A1 discloses a device for adding dilution water to the end of the dissolving region of a dissolving drum. The device comprises an annular groove arranged around the dissolving region of the dissolving drum, wherein the groove base of the annular groove forms the outer wall of the dissolving drum and two opposing annular groove walls protrude outward along the radial direction of the dissolving drum. Several curved tubes protrude from the annular groove into the interior of the dissolving drum, wherein the opening of each curved tube, located radially on the inner side, is oriented counter to the direction of rotation of the dissolving drum. The annular groove is covered by a fixed annular groove cover. A supply line and a drain line for the dilution water open into the annular groove cover.

[0007] DE 2012 219 708 A1 discloses a rotating drum for treating fibers. A dilution zone is located between the pulping zone and the screening zone. In the dilution zone, the pulp consistency is reduced by adding water. The dilution water can be shot through the screening zone into the dilution zone via at least one dilution water jet. For this purpose, the dilution water jet can be shot into the drum via the drum outlet.

[0008] The object underlying the invention is to create a water feed drum for adding water to dilute dissolved fibers, particularly for waste paper, with which the dilution of the fiber suspension after the dissolving process can be carried out efficiently, quickly, safely, and smoothly for effective screening. In particular, a reduction in the consistency of the dissolved fiber suspension to 10-12% is to be achieved over a short transport path in order to extend the processing path for screening in the screening drum.

[0009] This object is achieved according to the invention with regard to a water feed drum by the features of patent claim 1 and with regard to a fiber processing device by the features of patent claim 9. The further claims relate to preferred embodiments of the invention.

[0010] According to a first aspect, the invention provides a water feed drum with a water supply system for mixing a fiber suspension, preferably dissolved in a pulping drum, with fed-in water. The fiber suspension contains, in particular, fiber with high consistency in the HC range, such as waste paper, and can be flowed into the water feed drum in an inlet area.The water supply system comprises at least one water channel with a water receiving chamber and a flow channel adjoining the water receiving chamber, wherein the water receiving chamber is arranged in an outlet region and the flow channel opens into a deflection region, whereby a labyrinth-like water transport system is formed in which the water flows from the water receiving chamber into the flow channel, flows through the flow channel in a direction opposite to the flow direction of the fiber suspension and is deflected in the deflection region into the flow direction of the fiber suspension.

[0011] With the water feed drum according to the invention, the water is not fed directly into the fiber suspension; instead, the fiber suspension is only mixed with water after the fed water has flowed through the water intake chamber, the flow channel, and the deflection area. This allows the flow velocity of the water to be significantly increased, thus improving the efficiency of the mixing. Furthermore, the labyrinthine design of the water supply system prevents it from becoming contaminated with the fiber suspension, since the different flow directions of the supplied water and the fiber suspension effectively prevent the fiber suspension from flowing back into the flow channels.Overall, the sorting process of the fiber suspension is significantly improved, since the fiber suspension can be diluted to a sorting density in the range of 10-12% at an early stage of the process.

[0012] In a further development, the flow channel is U-shaped and has a gradient relative to an axial rotation axis (RA) of the water feed drum. This effectively promotes the water flow.

[0013] In one embodiment, it is provided that the water receiving chamber for supplying the water has a perforation area with perforations through which the water can be introduced radially into the water receiving chamber in a simple and efficient manner.

[0014] In a further embodiment, it is provided that a bottom region of the water receiving chamber is bevelled relative to the axial rotation axis (RA) of the water feed drum, so that the water can be deflected from a radial direction into an axial direction.

[0015] In particular, it is provided that a protective element is provided to protect the opening of the deflection area from contamination by the fiber suspension.

[0016] In an advantageous embodiment, the water supply system comprises a plurality of water channels arranged in a ring-like pattern on an inner surface of an outer shell of the water feed drum. This ensures that the water is evenly distributed over the entire inner surface of the water feed drum, allowing a high water supply to be achieved.

[0017] In a further embodiment, a first bulkhead with a through-opening for the fiber suspension flowing into the water feed drum and a second bulkhead with a through-opening for the out-flowing fiber suspension are provided. This allows for easy coupling to a pulping drum on the inlet side of the water feed drum and to a sorting drum on the outlet side of the water feed drum. In addition, the inflowing fiber suspension is guided into the water mixing area through the through-opening of the first bulkhead, protecting the water supply system from contamination. The fiber suspension mixed with water is guided out of the water feed chamber through the through-opening of the second bulkhead, protecting the water supply system from contamination.

[0018] Advantageously, water channels are arranged between the first bulkhead and a third circular bulkhead, thereby increasing the stability of the water supply system.

[0019] According to a second aspect, the invention provides a fiber processing device for dissolving and sorting fibers, in particular fibers with high stock densities in the HC range, such as waste paper. The fiber processing device comprises at least one dissolving drum with a drum body for dissolving fibers in a fiber suspension, and a sorting drum, directly or indirectly coupled to the dissolving drum, with an at least partially perforated drum body for subsequent sorting of the fiber suspension for separation into an accept and a reject.According to the invention, a water feed drum with a water supply system is arranged between the pulping drum and the sorting drum for mixing the fiber suspension dissolved in the pulping drum with fed-in water, wherein the water supply system comprises at least one water channel with a water receiving chamber and a flow channel adjoining the water receiving chamber, wherein the water receiving chamber is arranged in an outlet region and the flow channel opens into a deflection region, whereby a labyrinth-like water transport system is formed in which the water flows from the water receiving chamber into the flow channel, flows through the flow channel in a direction opposite to the flow direction of the fiber suspension and is deflected in the deflection region into the flow direction of the fiber suspension.

[0020] With the fiber processing device according to the invention, the water is not fed directly into the fiber suspension; instead, the fiber suspension is only mixed with water after the fed water has flowed through the water intake chamber, the flow channel, and the deflection area. This allows the flow velocity of the water to be significantly increased, thus improving the mixing efficiency. Furthermore, the labyrinthine design of the water supply system prevents it from becoming contaminated with the fiber suspension, since the different flow directions of the supplied water and the fiber suspension effectively prevent the fiber suspension from flowing back into the flow channels.Overall, the sorting process of the fiber suspension is significantly improved, since the fiber suspension can be diluted to a sorting density in the range of 10-12% at an early stage of the process.

[0021] In a further development, the flow channel is U-shaped and has a gradient relative to an axial rotation axis (RA) of the water feed drum. This effectively promotes the water flow.

[0022] In one embodiment, it is provided that the water receiving chamber for supplying the water has a perforation area with perforations through which the water can be introduced radially into the water receiving chamber in a simple and efficient manner.

[0023] In particular, the design of the perforation area corresponds to the design of the perforated outer shell of the sorting drum, as this simplifies the manufacture and assembly of the fiber processing device.

[0024] In a further embodiment, it is provided that a bottom region of the water receiving chamber is bevelled relative to the axial rotation axis (RA) of the water feed drum, so that the water can be deflected from a radial direction into an axial direction.

[0025] In particular, it is provided that a protective element is provided to protect the opening of the deflection area from contamination by the fiber suspension.

[0026] In an advantageous embodiment, the water supply system comprises a plurality of water channels arranged in a ring-like pattern on an inner surface of an outer shell of the water feed drum. This ensures that the water is evenly distributed over the entire inner surface of the water feed drum, allowing a high water supply to be achieved.

[0027] In a further embodiment, a first bulkhead with a through-opening for the fiber suspension flowing into the water feed drum is provided between the pulping drum and the water feed drum, while a second bulkhead with a through-opening for the outflowing fiber suspension is provided between the water feed drum and the sorting drum. This ensures simple coupling of the pulping drum to the inlet side of the water feed drum and the sorting drum to the outlet side of the water feed drum. Furthermore, the through-opening of the first bulkhead directs the inflowing fiber suspension into the water mixing area, protecting the water supply system from contamination.The fiber suspension mixed with water is led out of the water feed chamber through the passage opening of the second bulkhead and the water supply system is protected from contamination.

[0028] Advantageously, the water channels are arranged between the first bulkhead and a third circular bulkhead, thereby increasing the stability of the water supply system.

[0029] The invention is explained in more detail below with reference to embodiments shown in the drawing.

[0030] It shows: Fig. 1 a schematic representation of a fiber processing device according to the prior art; Fig. 2 a schematic sectional view of a fiber processing device with a water feed drum according to the invention; Fig. 3 a schematic representation of the fiber processing device according to the invention in a plan view; Fig. 4 a perspective interior view of the water feed drum with a water supply system; Fig. 5 a sectional view through the water supply system from Fig. 4; Fig. 6 a perspective top view of a first bulkhead; Fig. 7 a perspective top view of a second bulkhead; Fig. 8 a plan view of a third bulkhead.

[0031] Additional features, aspects and advantages of the invention or embodiments thereof will become apparent from the detailed description taken in conjunction with the claims.

[0032] In Fig. 1 schematically shows a fiber processing device 100 for pulping and sorting fibers according to the prior art. The fiber processing device 100 is suitable for pulping fibers with high consistency in the HC range, in particular waste paper stocks with a high reject content. The fiber processing device 100 comprises a pulping drum 10 and a sorting drum 20, which can be designed as a one-piece or two-piece construction.

[0033] The pulping drum 10 comprises a drum body 12, into which the fiber is fed, usually in the form of bales, into an inlet area 14. The rotation of the pulping drum 10, in conjunction with lifting elements arranged on the inside, conveys the fiber suspension upwards and then falls back to the bottom of the drum body 12. The resulting mechanical forces on the fiber allow it to be pulped. The rotating drum body 12 achieves a continuous pulping process, which leads to effective material utilization and uniform and stable processing of the fiber. In particular, speck-free pulping is possible for HC fibers and raw materials that are difficult to pulp, which can be supported if necessary by conducting the pulping at higher temperatures and / or adding chemicals.The rotation of the drum body 12 ensures gentle mixing and kneading of the fiber material, since sufficiently high shear forces are exerted on the fiber material components that still need to be separated in order to be able to dissolve the fiber material in an energy-efficient manner.

[0034] The sorting drum 20 is connected to the pulping drum 10. The sorting drum 20 comprises a drum body 22 provided with perforations. A portion of the fiber suspension fed to the sorting drum 20 from the pulping drum 10 can pass through the perforations as accept 23, while another portion of the fiber suspension is retained by the perforations as reject 24. Separation of the fibers from impurities takes place through the rotation of the drum body 22 in conjunction with lifting elements arranged on the inside. The fiber suspension is conveyed upwards by the rotation and then falls back to the bottom of the perforated drum body 22. Continuous sorting of the fiber suspension is achieved by the rotating drum body 22.To dilute the fiber suspension with water, at least one spray pipe 25 with nozzles is provided, which extends axially along the outer region of the sorting drum 20 and feeds water into the perforated drum body 22. In the interior of the drum body 12, the fiber suspension is diluted by the injected water so that the fibers can be washed out of the contaminants. During the rotations of the drum body 22, the water is either reflected off the inner surface of the drum body 22 or it flows through the perforations and is collected in a receiving container.

[0035] For efficient screening of the fiber in the screening drum 20, a fiber density of less than 10% to 12% in the fiber suspension is required. The initial density of the fiber suspension at the inlet area of ​​the screening drum 20 is in the range of 18% to 24%. To achieve a reduction in the initial density of the fiber suspension within the screening drum 20, which is in the range of 10% to 12%, a drum length of the screening drum 20 of several meters is required. However, this means that the front area of ​​the screening drum 20 is used for diluting the fiber suspension, since only after an acceptable dilution has been achieved can the fibers pass through the perforations in the drum body 22 as accepts 23.Therefore, the entire surface of the sorting drum 20 is not optimally utilized, since transport of the fibers through the perforations and thus sorting of the fibers can only begin at a fiber density of less than 10% to 12% in the fiber suspension. A significant portion of the sorting drum 20 is therefore used only for diluting the fiber suspension. Furthermore, due to insufficient absorption of the supplied water by the fiber suspension, some of the water is expelled in the bottom area of ​​the perforated drum body 22, so that it must be fed unused into a collecting container. This is associated with increased water consumption.

[0036] As in the Fig. 2 and Fig. As shown in Figure 3, according to the invention, a water feed drum 30 is arranged between the pulping drum 10 and the sorting drum 20. In addition, a drying drum 40 is connected to the sorting drum 20. However, it can also be provided that the water feed drum 30 is designed as a separate device that is not directly connected to the pulping drum 10 and / or sorting drum 20. In this case, the dissolved fiber suspension is fed to the water feed drum 30 via appropriately designed transport devices.

[0037] As from the Fig. As can be seen from Figure 3, the pulping drum 10, the sorting drum 20, the water feed drum 30, and the drying drum 40 preferably have the same diameter, which can be in the range of 2.5 to 4.5 m. In a preferred embodiment, the length L1 of the pulping drum 10 is, for example, 31 m, the length L2 of the water feed drum 30 is, for example, 3.5 m, the length L3 of the sorting drum 20 is, for example, 12 m, and the length L4 of the drying drum 40 is, for example, 1.5 m.

[0038] In the Fig. 4, the water feed drum 30 is shown in a perspective interior view. The water feed drum 30 is preferably directly connected to the pulping drum 10, with a first bulkhead 17 being provided between the pulping drum 10 and the water feed drum 30. Fig. 6, the first bulkhead 17 is shown in more detail in a perspective top view. The dissolved fiber suspension flows through a through-opening 18 of the first bulkhead 17 into an inlet area of ​​the water feed drum 30. After entering the water feed drum 30, water is added to the fiber suspension for dilution. For this purpose, the water feed drum 30 has a water supply system 32, which consists of a plurality of water channels 34 arranged in a ring on an inner surface of the outer casing 35 of the water feed drum 30. Between the water feed drum 30 and the sorting drum 20, a second bulkhead 27 with a through-opening 28 is provided, through which the fiber suspension, diluted and mixed with the fed-in water, flows into the sorting drum 20. In the Fig. Figure 7 shows the second bulkhead 27 in more detail in a perspective top view. In particular, the through-opening 18 of the first bulkhead 17 is larger than the through-opening 28 of the second bulkhead 28, since the volume of the fiber suspension increases due to the added water.

[0039] The water supply system 32 comprises a plurality of water channels 34 arranged in a ring on the cylindrical inner surface 35 of the water feed drum 30. This ensures that the water is fed in evenly over the entire inner surface of the water feed drum, and a high water supply can be achieved. In particular, the water channels 34 are arranged between the first bulkhead 17 and a third circular bulkhead 375. This increases the stability of the water supply system 32 and protects it from contamination. In particular, it is provided that the distance between the water channels 34 is equal. However, it can also be provided to combine several water channels 34 into a group. A water channel 34 has a water receiving chamber 37 and an adjoining flow channel 38 into which the water fed into the water receiving chamber 37 flows.The flow direction of the water is shown by arrows A and the flow direction of the fiber suspension by arrows B. The flow channel 38 is in particular U-shaped and has a gradient.

[0040] As in the Fig. 5, the water is introduced into the water receiving chamber 37 via a pipe system not shown in detail here. The pipe system preferably has a water pipe whose inlet opening is arranged above the upper rotation point of the cylindrical water feed drum 30, which can also be referred to as the 12 o'clock position, and which, during the rotation of the water feed drum 30, fills with water the water receiving chamber 37 located in the inlet area of ​​the water pipe. For the supply of water, the water receiving chamber 37 has a perforation area 372 with perforations through which the water can be introduced into the water receiving chamber 37 like in a shower process. In particular, the perforation area 372 is designed in the same way as the perforated outer casing of the sorting drum 20.In particular, it is provided that the perforation area 372 is formed circumferentially on the outer shell 35 of the water feed drum 30. It is separated from the non-perforated area of ​​the outer shell 35 of the water feed drum 30 on both sides by a seal 374, so that the water cannot spread unhindered over the outer shell 35 of the water feed drum 30.

[0041] The water intake chamber 37 is arranged in an outlet region of the water feed drum 30. A bottom region 377 of the water intake chamber 37 is beveled relative to an axial rotation axis, RA, of the water feed drum 30, so that the water can be deflected from a radial direction into an axial direction and then flow into the flow channel 38. The third bulkhead 375 is provided between the water intake chamber 37 and the flow channel 38 and is provided with through-openings 380 for the individual annularly arranged flow channels 38, so that the water can flow from the water intake chamber 37 into the flow channel 38. Fig.Figure 8 shows the second bulkhead 27 in more detail in a top view. The flow channel 38 has a gradient to increase the flow velocity of the water and now conveys the water in a direction opposite to the flow direction of the fiber suspension. The flow channel 38 ends in a deflection region 39, in which the flow direction of the water is deflected into the flow direction of the fiber suspension and the water exits from an opening 392. To protect the opening 392 of the deflection region 39 from contamination by the fiber suspension, which could lead to blockages of the opening 392, a protective element 394 is provided. In particular, the protective element 394 can be annular.

[0042] According to the invention, the water supply system 32 is thus designed as a type of labyrinth-shaped water transport system, so that the water is not fed directly into the fiber suspension, but rather mixing of the fiber suspension only takes place after the fed water has flowed through the water intake chamber 37, the flow channel 38, and the deflection area 39. This allows the flow velocity of the water to be significantly increased, so that the mixing efficiency can be improved. Furthermore, the labyrinth-like design of the water supply system 32 prevents it from becoming contaminated with the fiber suspension, since the different flow directions of the supplied water and the fiber suspension effectively prevent the fiber suspension from flowing back into the flow channels 38.In addition, the flow channel 38, in conjunction with the rotational speed of the water feed drum 30, is dimensioned such that an axial supply of the water fed radially in the 12 o'clock position only takes place in the area of ​​a 3 o'clock position of the water feed drum 30, since this allows efficient mixing to be achieved.

[0043] The water feed via the inventive water supply system 32 leads to an immediate dilution of the pulping consistency of the fiber suspension from 20% to a screening consistency of 10-12%. Fiber loss in the accept 23 is significantly reduced. Furthermore, the low pulp consistency reduces specific energy consumption, and the use of chemicals can be significantly reduced.

[0044] In a further embodiment, it can be provided that the temperature of the fed-in water is adapted to the consistency and nature of the respective fiber suspension in order to thereby control efficient mixing.

[0045] With the present invention, it is possible to require only a drum length of approximately 3.5 m to dilute the fiber suspension to a screening density of 10-12%, so that screening can begin in the front area of ​​the downstream screening drum 20. Thus, the entire length of the screening drum 20 can be used significantly more efficiently, increasing the yield of usable fibers. In addition to the dilution and mixing in the water feed drum 30, the fiber suspension can be further diluted in the screening drum 20 by the water supplied through the spray pipe 25.

[0046] The water feed drum 30 according to the invention significantly improves the sorting process of the fiber suspension, since the fiber suspension can be diluted to a sorting density in a range of 10-12% already at an early stage of the process.

[0047] In particular, it is possible to use a significantly longer transport distance for the actual sorting in the sorting drum 20 in a fiber processing device 100, since the front area of ​​the sorting drum 20 is not used for diluting and mixing the fiber suspension into a sorting density range of 10-12%. However, it is also possible to shorten the drum length of the sorting drum 20 of a fiber processing device in order to save material and costs. In particular, it is possible to safely and efficiently process very large tonnages in the range of more than 2,000 tons per day using the water feed drum 30 according to the invention and the fiber processing device 100. Reference symbol 10 pulping drum 12 drum bodies 14 Entrance area 17 first bulkhead 18 passage opening 20 sorting drum 22 drum bodies 23 Acceptable material 24 Reject 25 spray pipe 27 second bulkhead 28 passage opening 30 water feed drum 32 Water supply system 34 Water canal 35 outer jacket 37 Water intake chamber 38 flow channel 39 Deflection area 40 drying drum 100 fiber preparation device 320 Entrance area 340 Exit area 372 Perforation area 374 Seal 375 third bulkhead 377 Bottom area of ​​the water intake chamber 380 passage openings in the third bulkhead 392 Opening 394 protective element

Claims

[1] Water feed drum (30) with a water supply system (32) for mixing a fiber suspension, preferably dissolved in a dissolving drum (10), with fed-in water, wherein the fiber suspension contains in particular fiber with high consistency in the HC range such as waste paper and can be flowed into the water feed drum (30) in an inlet area (320), characterized byin that the water supply system (32) comprises at least one water channel (34) with a water receiving chamber (37) and a flow channel (38) adjoining the water receiving chamber (37), wherein the water receiving chamber (37) is arranged in an outlet region (340) and the flow channel (38) opens into a deflection region (39), whereby a labyrinth-like water transport system is formed in which the water flows from the water receiving chamber (37) into the flow channel (38), flows through the flow channel (38) in a direction opposite to the flow direction of the fiber suspension and is deflected in the deflection region (39) into the flow direction of the fiber suspension. [2] Water feed drum (30) according to claim 1, wherein the flow channel (38) is U-shaped and has a gradient relative to an axial axis of rotation (RA) of the water feed drum (30). [3] Water feed drum (30) according to claim 1 or 2, wherein the water receiving chamber (37) for supplying the water has a perforation area (372) with perforations through which the water can be introduced radially into the water receiving chamber (37). [4] Water feed drum (30) according to one of claims 1 to 3, wherein a bottom region (377) of the water receiving chamber (37) is bevelled relative to the axial rotation axis (RA) of the water feed drum (30), so that a deflection of the water from a radial direction into an axial direction can take place. [5] Water feed drum (30) according to one of claims 1 to 4, wherein a protective element (394) is provided to protect the opening (392) of the deflection region (39) from contamination by the fiber suspension. [6] Water feed drum (30) according to one of claims 1 to 5, wherein the water supply system (32) comprises a plurality of water channels (34) arranged in a ring shape on an inner surface of an outer shell (35) of the water feed drum (30). [7] Water feed drum (30) according to one of claims 1 to 6, wherein a first bulkhead (17) is provided with a through-opening (18) for the fiber suspension flowing into the water feed drum (30) and a second bulkhead (27) is provided with a through-opening (28) for the fiber suspension flowing out. [8] Water feed drum (30) according to one of claims 1 to 7, wherein the water channels (34) are arranged between the first bulkhead (17) and a third circular bulkhead (375). [9] Fibre preparation device (100) for dissolving and sorting fibres, in particular fibres with high stock densities in the HC range such as waste paper, comprising at least one dissolving drum (10) with a drum body (12) for dissolving fibres in a fibre suspension and a sorting drum (20) directly or indirectly coupled to the dissolving drum (10) with an at least partially perforated drum body (22) for subsequent sorting of the fibre suspension for separation into an accept (23) and a reject (24), characterized bythat a water feed drum (30) with a water supply system (32) is arranged between the pulping drum (10) and the sorting drum (20) for mixing the fiber suspension dissolved in the pulping drum (10) with fed-in water, wherein the water supply system (32) comprises at least one water channel (34) with a water receiving chamber (37) and a flow channel (38) adjoining the water receiving chamber (37), wherein the water receiving chamber (37) is arranged in an outlet region (340) and the flow channel (38) opens into a deflection region (39), whereby a labyrinth-like water transport system is formed, in which the water flows from the water receiving chamber (37) into the flow channel (38), flows through the flow channel (38) in a direction opposite to the flow direction of the fiber suspension and in the deflection region (39) in the flow direction of the Fiber suspension is diverted. [10] Fiber processing device according to claim 9, wherein the flow channel (38) is U-shaped and has a gradient relative to an axial rotation axis (RA) of the water feed drum (30). [11] Fiber processing device (100) according to claim 9 or 10, wherein the water receiving chamber (37) for supplying the water has a perforation area (372) with perforations through which the water can be introduced radially into the water receiving chamber (37), and wherein the design of the perforation area (372) corresponds to the design of the perforated outer shell of the sorting drum (20). [12] Fiber processing device (100) according to one of claims 9 to 11, wherein a bottom region (377) of the water receiving chamber (37) is beveled relative to the axial rotation axis (RA) of the water feed drum (30), so that a deflection of the water from a radial direction into an axial direction can take place. [13] Fiber processing device (100) according to one of claims 9 to 12, wherein a protective element (394) is provided to protect the opening (392) of the deflection region (39) from contamination by the fiber suspension. [14] Fiber processing device (100) according to one of claims 9 to 13, wherein the water supply system (32) has a plurality of water channels (34) arranged in a ring shape on an inner surface of an outer shell (35) of the water feed drum (30). [15] Fiber processing device (100) according to one of claims 9 to 14, wherein a first bulkhead (17) with a through-opening (18) for the fiber suspension flowing into the water feed drum (30) is provided between the pulping drum (10) and the water feed drum (30), wherein a second bulkhead (27) with a through-opening (28) for the fiber suspension flowing out into the sorting drum (20) is provided between the water feed drum (30) and the sorting drum (20), and wherein the water channels (34) are arranged between the first bulkhead (17) and a third circular bulkhead (375).

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