EP4367320A1 - Rotor für den einsatz in der stoffaufbereitung - Google Patents
Rotor für den einsatz in der stoffaufbereitungInfo
- Publication number
- EP4367320A1 EP4367320A1 EP22737484.0A EP22737484A EP4367320A1 EP 4367320 A1 EP4367320 A1 EP 4367320A1 EP 22737484 A EP22737484 A EP 22737484A EP 4367320 A1 EP4367320 A1 EP 4367320A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rotor
- functional
- suspension
- paper
- functional surface
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
- D21B1/34—Kneading or mixing; Pulpers
- D21B1/345—Pulpers
- D21B1/347—Rotor assemblies
Definitions
- the invention relates to various types of rotors for use in stock preparation according to the preamble of patent claim 1.
- a rotor is used in the pulper.
- the pulper is filled with warm return water and the rotor in the pulper causes the filled water to rotate. Paper is added in bales or loose. The paper is wetted by the water.
- the rotor creates a current that pulls the paper into the area of the rotor.
- the rotor roughly shreds the paper that is filled in. Above a certain size of the paper pieces, the efficiency of the rotor decreases. A further dissolution now takes place through an impact effect in the area of the screen plate openings. The degree of efficiency also decreases as the pieces of paper become smaller. In the following, a further dissolving only takes place in the moving material through material friction.
- the rotor includes at least one helix.
- the helix has a pitch section A and a section B that does not belong to the pitch section.
- the setting section A is arranged at an angle to section B.
- the object of the invention was to improve the quality of the fiber suspension produced in the respective process step.
- the invention was based on the object of producing a more uniform fiber suspension and increasing the proportion of free, isolated fibers.
- the rotor according to the invention with functional surfaces makes it possible to achieve an improved fiber suspension in a fiber preparation plant.
- Functional surfaces are surfaces with a rough surface.
- the functional surfaces preferably have an overall height of a roughness profile Rt in the range from 0.15 mm to 5 mm.
- the total height of a roughness profile can be recorded, for example, using a Parthometer S3P surface measuring device. A measuring section of 10 times the value of the total height of the roughness profile has proven to be suitable as a measuring section. If the overall height of the roughness profile is more than 4 mm, the overall height of the roughness profile can preferably be determined by an impression. Locally generated vortices cause specks and/or pieces of paper to slide along the functional surfaces.
- the specks or pieces of paper are subjected to friction and/or shearing forces and are broken down into individual fibers.
- the functional surfaces are provided on the surfaces facing away from the preferred direction. As a result, gentle processing of the components flowing past is achieved. A high energy input is avoided and wear of the functional surfaces is kept low. It is an essential feature that the functional surface is on the side facing away from the flow and is therefore less exposed to wear. Also in order to keep the energy requirement low, no functional surfaces are provided on the inflow surface.
- the inflow surface has a lower roughness than the functional surface.
- the functional surface is a structured surface with structures, in particular regular structures, of at least 0.15 mm, preferably 1.5 mm, height measured perpendicular to the surface normal of the surface spanned by the minimum points.
- This surface structure can be measured using electron microscopy. This difference in height has proven to be advantageous in order to interact with pieces of paper flowing past. In particular, pieces of paper or specks can get caught in the structures and then be gently broken down into individual fibers by the shearing forces generated by the suspension continuing to flow past the structure. The suspension flowing past also has the effect that the functional surface is rinsed and clogging of the surface structure is prevented.
- the functional surface structure is therefore to be selected in such a way that, depending on the suspension used, the surface structure does not become clogged in the machining process.
- the surface is clogged when a fiber mat lays on the functional surface and a function is no longer guaranteed as a result.
- a further embodiment provides that the functional surface is a rough surface, ie a surface with an aperiodic structure, from a height of 0.15 mm to 5 mm.
- a suitable processing of fiber composites can be achieved.
- a preferred application provides for the rotor to be used with functional surfaces for use in a pulper. This further increases the efficiency of the pulper.
- the functional surfaces can be used to dissolve specks and flakes through interaction with functional surfaces. It has proven to be advantageous to provide functional surfaces on the surface of the rotor blades that is not directly exposed to the flow. In particular in areas where turbulent flow develops during operation, the provision of functional surfaces for gentle processing of the fiber composites has proven itself. In this case, different surfaces facing away from the rotor blades can be provided with different functional surfaces.
- a functional surface provided almost parallel to the screen on the side of the rotor blade facing away from the screen can be provided with a different structure than a surface running perpendicular to the screen on a side of the rotor blade facing away from the preferred direction.
- These functional surfaces can be provided in addition or as the only functional surfaces.
- the functional surface on the rotor shaft is arranged adjacent to the side of the rotor facing away from the preferred direction and only extends over a partial area in the circumferential direction. This makes it possible to vary the functional surface in the surface areas depending on the application. This produces an effect suitable for improving fiber suspension.
- Functional surfaces on stirring elements cause the fibers to fibrillate gently. This improves paper strength without damaging the fibers. Horny fiber surfaces are reactivated. The functional surfaces are so fine that no spinning occurs and no sticking occurs. However, there is so much flow intensity that the functional surfaces are always cleaned themselves and no deposits form.
- the at least one functional surface is provided on one of the rotor blades, preferably all rotor blades, in an outflow area.
- the functional surface covers a maximum area of 50% of the respective area. Turbulent areas preferably form in such outflow areas Flows from what favors an interaction with the functional surface.
- the rotor blade is formed radially on the outside with flow surfaces running in the circumferential direction and functional surfaces are formed as a surface area.
- This functional surface is formed at the end of the flow surface facing away from the preferred direction with an axial extension.
- the rotor blade is designed radially on the inside with flow surfaces running in the circumferential direction and functional surfaces are designed as a surface area. Functional surface areas can also be provided inside and outside.
- the rotor has proven to be a preferred use for use in a screening device for detaching a fiber mat forming on the screen.
- the method according to the invention for operating the rotor according to one of the preceding claims is characterized in that fibers of a fiber suspension are accelerated by the rotational movement of the rotor.
- the fibers first interact with the surfaces of the rotor blades facing the preferred direction and are then accelerated part of the fiber suspension moved by the rotor flows past the at least one functional surface of the rotor in an area facing away from the preferred direction and is additionally broken up or deflaked or defibrillated by an interaction with the functional surface.
- This additional treatment represents a particularly gentle treatment.
- FIG. 1 schematic representation of a pulp processing plant in
- FIG. 1 shows a screening device 9 of a fiber preparation plant 1.
- FIG. The version shown is a pressure sorter.
- This screening device 9 has a suspension feed 3 and an accept discharge 5 and a reject discharge 7 .
- a screen 11 designed as a screen basket is arranged vertically. Alternatively, not shown, the screen could also be arranged horizontally.
- a rotor 21 is arranged on the side of the screen basket facing the suspension feed. Fl ier the rotor 21 is arranged radially inside the screen basket.
- the rotor 21 includes a drivable rotor shaft 25. Rotor blades 23 are firmly connected to the rotor shaft 25.
- These rotor blades 23 are arranged at a distance from the rotor shaft 25 in the radial direction. Fibers and impurities located on the screen 11 are removed from the screen 11 by these rotor blades 23 .
- the rotor blades 23 are arranged vertically at a radial distance from the screen 11 and rotate in front of the screen during operation.
- the rotor blades 23 have an inflow area 31 pointing in the direction of rotation and an outflow area 39 at the end 29 of the rotor blade 23 in relation to the circumferential direction 33 .
- This outflow area 39 is provided with a functional surface 41 . Fiber suspension is fed to the screening device 9 during operation. The suspension is accelerated in the direction of the screen 11 by a negative pressure prevailing on the accepts side.
- Suspension with fibers pass through the screen 11.
- the components of the suspension retained by the screen 11 are removed from the screen by the rotor blades rotating past the screen.
- the accept that has passed through the screen is discharged through the accept discharge.
- Impurities fall out of the screening device 9 at the bottom and are discharged through a reject discharge 7 .
- the radial distance to the screen 11 is increasingly greater and it can form a turbulent flow.
- the components of the suspension detached from the screen 11 are subjected to gentle processing by the functional surface 41 provided in this area. It can Fiber composites are dissolved.
- thickening in the sorting device 9 also referred to as a pressure sorter, can be reduced.
- the efficiency of the sorting device 9 is increased. Due to the position of the functional surface 41, the wear and tear of the functional surface 41 is low and the associated energy requirement is also low. In the case of such sorting devices 9, fine functional surfaces have proven to be particularly suitable. Fine functional surfaces are surfaces with an overall roughness profile Rt of 0.15 to 1.5 mm. A wear that requires a refurbishment of the functional surface 41 is to be expected at the same intervals as a necessary refurbishment of the rotor.
- a rotor 27 provided for a pulper is shown in FIG.
- Such rotors 27 are provided for mixing the components in pulpers.
- the pulper is filled with warm white water.
- the rotor 27 in the pulper sets the filled water in rotation. Paper is added in bales or loose. The paper is wetted by the water.
- the rotor 27 pulls the paper into the area of the rotor 27, here a coarse shredding of the filled paper now takes place. Above a certain size of the paper pieces, the efficiency of the rotor 27 decreases. The paper is then broken up further by impact effects on the screen plate openings of the pulper. But here, too, the efficiency decreases as the pieces of paper become smaller. Now a further dissolving only takes place in the moving material through material friction.
- the rotor blades 23 are connected to the rotor shaft 25 .
- the rotor blades 23 have an inflow surface 31 facing the direction of rotation.
- a functional surface 41 is provided on the rear surface of the rotor blade 23 in each case. This surface is arranged facing away from the preferred direction 33 . This means that the surface is opposite to the direction of rotation on the wing 23 of the rotor 21 arranged. This achieves a better resolution of paper parts and specks with all types of paper.
- the specks and pieces of paper are stressed and disintegrate into individual fibers.
- Pieces of paper are dissolved into specks and specks into fibers.
- the fibers are detached from the fiber composite on the many small impact surfaces of the functional surface 41 . Even if the corners and edges of the functional surfaces are rounded, a shearing effect of the functional surface 41 is retained.
- the suspension flowing past the functional surface 41, 41 ' experiences a shearing force due to the flow paths of different lengths. Small color particles and line parts can also be comminuted on functional surfaces 41, 41 ' .
- a propeller 51 that can be used as a pump wheel is shown as the rotor 21 in FIG. Such impellers can be used in pumps for pumping fiber suspension.
- the rotor 21 is also referred to as a propeller 51 and has a rotor shaft 25 .
- Radially extending rotor blades 23 are connected to the rotor shaft 25 .
- Functional surfaces 41, 41 ' are provided in the circumferential direction between the rotor blades 23 and also on the remote surface of the rotor blade. Different functional surfaces 41 and 41 ' can be provided on the opposite surface of the rotor blades and on the rotor shaft 25 between the blades.
- Functional surfaces 41 can also be provided only on the rotor blades 23 or functional surfaces only on the shaft 41 ' .
- On propellers 51 on agitators functional surfaces 41 are attached opposite the conveying propeller blade side.
- Functional surfaces 41, 41 ' on propellers bring about gentle minimal fibrillation of the fibers. This improves paper strength without damaging the fibers. Horny fiber surfaces are reactivated.
- the functional surfaces 41, 41 ' are so fine that no spinning forms and no sticking occurs. However, there is so much flow intensity that the functional surfaces 41, 41 ' are always cleaned themselves and no deposits form.
- the flea depth difference can be determined with suitable measuring equipment depending on the depth difference.
- the functional surface 41, 41 ' can consist of scores, grooves, bores and elevations of any shape. Different functional surfaces 41, 41 ' are shown in FIGS.
- FIG. 4 shows a rotor for a flat screen.
- the rotor is provided with a functional surface with a rib structure 61 .
- FIG. 1 A particularly fine functional surface is shown in FIG. This surface has an aperiodic structure and has a height-to-depth ratio of 0.15 mm.
- Reference List
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102021117526.7A DE102021117526A1 (de) | 2021-07-07 | 2021-07-07 | Rotor für den Einsatz in der Stoffaufbereitung |
| PCT/EP2022/068142 WO2023280682A1 (de) | 2021-07-07 | 2022-06-30 | Rotor für den einsatz in der stoffaufbereitung |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP4367320A1 true EP4367320A1 (de) | 2024-05-15 |
| EP4367320B1 EP4367320B1 (de) | 2025-08-13 |
| EP4367320C0 EP4367320C0 (de) | 2025-08-13 |
Family
ID=82385438
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP22737484.0A Active EP4367320B1 (de) | 2021-07-07 | 2022-06-30 | Rotor für den einsatz in der stoffaufbereitung |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4367320B1 (de) |
| CN (1) | CN222251508U (de) |
| DE (1) | DE102021117526A1 (de) |
| WO (1) | WO2023280682A1 (de) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3163368A (en) | 1961-12-18 | 1964-12-29 | Bolton John W & Sons Inc | Bottom drive pulper with stationary blades |
| DE29619247U1 (de) | 1996-11-06 | 1996-12-19 | Voith Sulzer Stoffaufbereitung GmbH, 88212 Ravensburg | Stofflöser zur Hochkonsistenz-Behandlung von papierfaserhaltigem Stoff sowie Rotor für solchen Stofflöser |
| DE102011005024A1 (de) * | 2011-03-03 | 2012-09-06 | Voith Patent Gmbh | Rotor |
-
2021
- 2021-07-07 DE DE102021117526.7A patent/DE102021117526A1/de active Pending
-
2022
- 2022-06-30 EP EP22737484.0A patent/EP4367320B1/de active Active
- 2022-06-30 WO PCT/EP2022/068142 patent/WO2023280682A1/de not_active Ceased
- 2022-06-30 CN CN202290000549.9U patent/CN222251508U/zh active Active
Also Published As
| Publication number | Publication date |
|---|---|
| EP4367320B1 (de) | 2025-08-13 |
| EP4367320C0 (de) | 2025-08-13 |
| DE102021117526A1 (de) | 2023-01-12 |
| WO2023280682A1 (de) | 2023-01-12 |
| CN222251508U (zh) | 2024-12-27 |
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