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EP4291705B1 - Apparatus and method for reclamation of fibres from feedstock containing lignocellulose, in particular from straw - Google Patents

Apparatus and method for reclamation of fibres from feedstock containing lignocellulose, in particular from straw Download PDF

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Publication number
EP4291705B1
EP4291705B1 EP22705808.8A EP22705808A EP4291705B1 EP 4291705 B1 EP4291705 B1 EP 4291705B1 EP 22705808 A EP22705808 A EP 22705808A EP 4291705 B1 EP4291705 B1 EP 4291705B1
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EP
European Patent Office
Prior art keywords
refiner
worm
screw
conveyor
plant according
Prior art date
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Active
Application number
EP22705808.8A
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German (de)
French (fr)
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EP4291705C0 (en
EP4291705A1 (en
Inventor
Achim NEUMÜLLER
Helmut Roll
Fabian KÖFFERS
Michael SCHÖLER
Sven Zimmer
Klaus Schürmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siempelkamp Maschinen und Anlagenbau GmbH and Co KG
Original Assignee
Siempelkamp Maschinen und Anlagenbau GmbH and Co KG
Priority date (The priority date 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 date listed.)
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Publication of EP4291705A1 publication Critical patent/EP4291705A1/en
Application granted granted Critical
Publication of EP4291705C0 publication Critical patent/EP4291705C0/en
Publication of EP4291705B1 publication Critical patent/EP4291705B1/en
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/20—Methods of refining
    • D21D1/30—Disc mills
    • 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
    • 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
    • D21B1/14—Disintegrating in mills
    • D21B1/18—Disintegrating in mills in magazine-type machines
    • D21B1/22—Disintegrating in mills in magazine-type machines with screw feed
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/12—Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse

Definitions

  • the invention relates to a plant for obtaining fibres from lignocellulose-containing feed material, in particular from straw according to the preamble of claim 1.
  • lignocellulosic feed material includes materials such as wood chips, annual plants, straw, bagasse and similar. Fibers obtained from these are used in subsequent processes as a starting material for the production of wood materials and, to a considerable extent, for the manufacture of fiberboards such as MDF boards and HDF boards. Such fibers can also be used to produce paper, cardboard, paperboard, etc.
  • a uniform and trouble-free flow of the feed material through the refiner is of crucial importance for the economic efficiency of the process and the quality of the products manufactured.
  • AT 510 109 A2 From the AT 510 109 A2 A method, a system and a refiner for grinding feed material in the form of wood chips or pulp fibers are also known, whereby the feed material is transported through two successive grinding stages by means of a carrier medium. Each grinding stage comprises a refiner to which the feed material is fed via a screw conveyor with a stationary casing and rotating core element. The core element rotates at a speed of between 1500 rpm and 3000 rpm.
  • AT 510 109 A2 discloses a system according to the preamble of claim 1.
  • a comparable refiner with screw conveyor is in the WO 96/35016 A1 disclosed.
  • the casing of the screw conveyor and the screw spiral rotating within it are each conical.
  • the screw conveyor is operated in a speed range of 1800 rpm to 2400 rpm.
  • the object of the invention is to further develop known plants and methods for obtaining fibers from lignocellulosic material with regard to the most uniform possible flow through the refiner in particular.
  • the invention is based on the idea of preparing a continuous and uniform feeding of the refiner with feed material over the circumference of the refiner tools, not only within the refiner, but already in the screw conveyor upstream of the refiner.
  • a screw conveyor is designed to operate at a speed of at least 400 rpm. This measure means that material particles that detach from the inner circumference of the screw trough are caught by the rapidly rotating screw flights immediately after they detach and therefore at a very early point in time and are subjected to a circular or helical movement.
  • the centrifugal forces activated in this process ensure that the material particles are carried back to the inner circumference of the screw trough so that the layer of feed material there is retained. In this way, it is possible to bring the feed material in the screw conveyor in a constant material flow, which can be fed axially to the refiner in the form of a material layer that extends evenly over the entire inner circumference of the screw trough.
  • the bulk density of such materials can, for example, be less than 90 kg/m 3 , in special cases less than 70 kg/m 3 or even less than 50 kg/m 3 .
  • a system according to the invention is therefore characterized by an expanded field of application compared to the prior art.
  • the effect that can be achieved with the invention is essentially dependent on the speed of the screw flights, the diameter of the conveyor screw and the bulk density of the feed material, which must be coordinated with one another.
  • Increasing the speed reduces the proportion of material particles that detach from the material flow.
  • increasing the speed may make it possible for feed material with a low bulk density to be fed to a refiner in the required manner by means of a screw conveyor.
  • preferred embodiments of the invention are designed for increased speeds of the conveyor screw of at least 500 rpm, preferably at least 600 rpm, most preferably at least 700 rpm.
  • the acceleration in the direction of rotation exerted on the material particles by the rotating screw flights is also dependent on the diameter of the conveyor screw, as this determines the circumferential speed of the screw flights. For example, at the same speed, large diameters lead to comparatively higher circumferential speeds than small diameters.
  • the invention prefers circumferential speeds of the radially outer spiral circumference of at least 25 m/s, preferably of at least 30 m/s and most preferably of at least 40 m/s, which results in the advantages mentioned above.
  • the conveyor screw is also held in a pivot bearing at its discharge end.
  • This solves the problem This means that the conveyor screw circles eccentrically around the axis of rotation with this end and may hit the screw trough, with the risk of damaging the screw conveyor. This risk increases in particular with increasing speed and/or length of the conveyor screws.
  • the inventive arrangement of a rotary bearing at the discharge end of the conveyor screw enables a system according to the invention to be operated without risk for personnel and machines, even at high speeds and/or when long conveyor screws are used. For example, conveyor screws with a length of 5 m or 6 m or longer can be operated without any problem with such a rotary bearing.
  • the rotary bearing is arranged inside the screw trough or in the feed opening of the refiner, i.e. in the area before entering the refiner.
  • the advantage is a comparatively lower design effort regarding the bearing of the discharge end of the conveyor screw.
  • the rotary bearing can advantageously have one or more struts which extend from the bearing area near the axis to the inner circumference of the screw trough or the inlet opening, where they are fastened.
  • the course of the struts can deviate from a radial direction with respect to the axis of rotation by offsetting the radially inner end relative to the radially outer end in the circumferential direction or in the plane of the rotary bearing, which leads to a slight inclination of the struts or at least the first strut side against which the feed material flows in the plane of the rotary bearing.
  • Another preferred measure for minimizing the load on the struts is to design the geometry of the strut cross-section depending on the existing material flow.
  • the second strut side facing the conveying direction of the screw conveyor can be offset in the direction of rotation of the screw spirals compared to the third strut side facing in the conveying direction.
  • the resulting surfaces connecting the second and third strut sides are thus aligned parallel to the material flow, which minimizes the flow resistance emanating from the pivot bearing.
  • an optional device for flushing the bearing area of the rotary bearing is provided.
  • a flushing fluid is forced under pressure axially through the sliding joint that runs concentrically around the axis of rotation between the rotating worm shaft and the fixed rotary bearing, which effectively prevents foreign particles from penetrating the sliding joint and, subsequently, the bearing area.
  • the Fig. 1 and 2 give an overview of the structure of a plant 1 according to the invention and the interaction of its components.
  • the reference numeral 2 designates a bunker in which the feed material 20, in this case straw, stored and pre-steamed and pre-heated.
  • the feed material 20 passes through the funnel-shaped bunker discharge 3 into a screw conveyor 4, which conveys it to a cooker 5. Before entering the cooker 5, the feed material 20 is compacted and dewatered in the discharge area of the screw conveyor 4.
  • the cooker 5 is essentially designed like a tower and the feed material 20 flows through it from top to bottom.
  • the feed material 20 is pretreated under the influence of pressure and heat, with the aim of softening lignin-containing components in the feed material 20 and thus preparing the feed material 20 for fiber extraction.
  • An agitator 47 at the base of the cooker 5 ensures that the feed material 20 is sufficiently mixed.
  • a conveyor device 6 is connected to the lower part of the digester 5 and feeds the feed material 20 to a refiner 7, where the fibers are broken down by applying shear forces under pressure and steam.
  • the refiner 7 has a refiner device with fixed first refiner tools 9 arranged in a ring around an axis 8 and second refiner tools 10 rotating around the axis 8, which are axially opposite the first refiner tools 9 to form a grinding gap 11.
  • the drive unit for the refiner 7 carries in Fig. 1 the reference number 12.
  • the fibers 40 obtained by passing through the grinding gap 11 by means of the refining tools 9, 10 are led via a blow line 15 to a dryer (not shown in more detail).
  • the fibers 40 are glued in the blow line 15 and, after drying, are scattered into a mold and pressed into wood fiber boards. The entire process described runs continuously.
  • the conveyor device 6 comprises a discharge screw 13 associated with the digester 5, which is integrated into the lower part of the digester 5 and opens transversely to its conveying direction into a screw conveyor 14 associated with the refiner 7.
  • the discharge screw 13 essentially comprises a screw trough 16, in which a screw shaft 17 with a helix 18 is rotatably mounted in a shaft bearing 19 and is driven by a drive unit 22 via a gear 21.
  • the screw trough 16 tapers slightly at the discharge end in order to form a compact, sealing
  • the throughput of the system 1 and in particular of the refiner 7 is adjusted by regulating the speed of the discharge screw 13.
  • the screw conveyor 14 used to feed the refiner 7 with feed material 20 has a screw trough 23 with a flanged shaft bearing 24 for receiving a conveyor screw 48 coaxial with the axis 8 with a screw shaft 25 and two spirals 29.
  • the discharge end of the screw trough 23 is flush with an inlet opening 26 in the refiner housing that is concentric with the axis 8.
  • a drive 27 is non-positively connected to the screw shaft 25 via a reduction gear 28.
  • An electric motor can be used as the drive 27, the speed of which can be continuously adjusted and regulated if an additional frequency converter is provided.
  • the output shaft of the drive 27 can be directly coupled to the drive shaft of the screw conveyor 14, wherein the speed of the drive can also be continuously adjusted and regulated via a frequency converter.
  • the two parallel spirals 29 are clearly designed like a band and run around the screw shaft 25 in a helical manner at a clear radial distance from the screw shaft 23, to which they are attached via a plurality of radial holding arms 31.
  • the spirals 29 move with their respective outer circumference along the inner circumference of the screw trough 21 and, as they rotate, take the feed material 20 present there with them in the axial direction to the refiner 7.
  • the pretreated feed material 20 is fed in a metered manner from the discharge screw 13 to the screw conveyor 14 via its lateral opening 35 radially to the axis 8 and is there captured by the rotating spirals 29.
  • the spirals 29 initially take the feed material 20 in the direction of rotation 49, whereby centrifugal forces are activated which accelerate the feed material 20 radially outwards.
  • the feed material 20 collects on the entire inner circumference of the screw trough 23, where it forms a layer of material.
  • the feed material 20 is conveyed in the form of a material flow by the spirals 29 axially through the inlet opening 26 into the effective area of the refiner tools 9, 10.
  • the material flow is in Fig. 3 symbolized by the arrows 36.
  • the feed material 20 is broken down in the grinding gap 11 between the first refiner tools 9 and the second refiner tools 10, with the steam 30 present there partially exiting radially from the grinding gap 11 with the broken down fibers 40.
  • the other part of the steam 40 flows back through the inlet opening 35 into the screw conveyor 14, where it passes in the flow space 32 in countercurrent to the feed material 20 to the opening 33 in the screw trough 23 and from there is returned to the cooker 5.
  • Arrow 37 represents this steam flow.
  • the speed of the worm shaft 25 with spirals 29 is at least 400 rpm, preferably at least 500 rpm, most preferably at least 600 rpm, in particular at least 700 rpm.
  • circumferential speeds on the outer spiral circumference of at least 25 m/s, preferably at least 30 m/s, most preferably at least 35 m/s and in particular more than 40 m/s arise.
  • the return flow space 32 can be kept largely free of feed material 20 in this way and the layer of material on the inner circumference of the screw trough 23 remains intact, which is important for uniform feeding of the refiner.
  • Fig. 4 shows an embodiment of a screw conveyor 14', which essentially corresponds to the embodiment described above, so that reference is made to the above statements to avoid repetition.
  • the main difference in this embodiment is the mounting of the screw shaft 25 at the discharge end of the screw conveyor 14' in a pivot bearing 38.
  • the pivot bearing 38 is rigidly connected to the screw trough 23 or the refiner 7, for example on the inner circumference of the screw trough 23 or in the area of the inlet opening 26 in the refiner housing.
  • the pivot bearing 38 is designed as a roller bearing, the rotating inner ring 39 of which is seated in a rotationally fixed manner on the end of the screw shaft 25 and the stationary outer ring 41 of which is held in the center of a fastening ring 43 via three struts 42.
  • the fastening ring 43 is, for example, fixed in position with its outer circumference on the inner circumference of the screw trough 23, which can be widened in this area, or is mounted between the screw conveyor 14' and the refiner housing or is inserted into the inlet opening 26 of the refiner housing.
  • Fig. 4 also shows that the struts 42 each have a first strut side 44 pointing against the direction of rotation 49 of the spirals 29, the radially inner strut end of which is offset from its radially outer strut end against the direction of rotation 49.
  • the first strut side 44 of the struts 42 runs approximately tangentially to the rotating inner ring 39 and thus deviates from a radial alignment by an angle which can be between 5° and 15°, for example, and is preferably 10°.
  • the Fig. 5 and Fig. 6 relate to a further development of the pivot bearing 38', in which the struts 42' are adapted to the direction of the material flow 36 in this area.
  • the struts 42' each have a second strut side 45 pointing in the opposite direction to the conveying direction of the screw conveyor 14 and a third strut side 46 pointing in the conveying direction.
  • the second strut side 45 and third strut side 46 are therefore located on the opposite sides of the struts 42'.
  • the third strut side 46 is offset from the second strut side 45 in the direction of rotation 49 of the conveyor screw 48, which means that the surfaces connecting the second strut side 45 and third strut side 46 run approximately parallel to the material flow there. In this way, the struts 42' form a minimal flow resistance for the feed material 20 passing through the pivot bearing 38'.
  • Fig. 7 is an embodiment of a screw conveyor 14 in which the rotary bearing 38" is equipped with a flushing device to protect the bearing area from penetrating foreign particles. Only the end section of the conveyor screw 48' is visible, which is rotatably held in the rotary bearing 38" and is supported via the rotary bearing 38" on the inner circumference of the merely indicated screw trough 23.
  • the pivot bearing 38" arranged coaxially to the axis 8 corresponds with regard to the fastening ring 43 and the struts 42' to the Fig. 5 and 6 described, so that what is said there applies accordingly. Differences exist above all in the connection to the conveyor screw 48', which will be explained in more detail below.
  • the in Fig. 7 The end section of the conveyor screw 48' of the screw conveyor 14 shown shows that the screw shaft 25 rotating about the axis 8 is a hollow shaft, the wall of which is stepped at the end with a first recess 51 of larger diameter at the end and a second recess 52 of smaller diameter axially adjacent to it.
  • a coaxial, co-rotating flushing pipe 53 runs inside the screw shaft 25, via which a pressurized flushing fluid 54 can be fed to the bearing area.
  • the end of the flushing pipe 53 is fixed in a cylindrical bearing disk 55, which for this purpose has a through hole 56 coaxial to the axis 8. which completely penetrates the flushing pipe 53.
  • the bearing disk 55 sits in a form-fitting and force-fitting manner in the second recess 52 of the worm shaft 25.
  • a flushing head 57 is additionally inserted into the second recess 52, which also rotates and is rotationally symmetrical to the axis 8.
  • the flushing head 57 is supported with its outer circumference on the second recess 52 and engages with a coaxial cylindrical projection 58 in a complementarily shaped recess 59 in the bearing disk 55.
  • the flushing head 57 continues in a coaxial bearing journal 60 of smaller diameter, on the end of which the inner ring 39 of a rolling bearing is finally seated.
  • a bearing sleeve 61 which is also rotationally symmetrical, is inserted into the first recess 51 and is secured with its axially outer end section facing the pivot bearing 38" in a form-fitting and force-fitting manner in the central opening 68 of the pivot bearing 38" and is arranged with its axially opposite inner end section in the first recess 51 of the worm shaft 25, forming a circumferential sliding joint 62.
  • the central opening 68 is tightly closed with a cover 69.
  • the bearing sleeve 61 has a radially inwardly extending annular shoulder 63 which reaches up to the circumference of the bearing journal 60 and forms a sliding seal 64 with it.
  • annular space 65 is formed surrounding the bearing journal 60.
  • a blind bore 66 is made in the flushing head 57 in the axial extension of the flushing pipe 53, which is connected at its base to the annular space 65 via a number of channels 67 running obliquely outwards.
  • the flushing fluid 54 supplied under pressure via the flushing pipe 53 and the flushing head 57 is evenly distributed in the annular space 65, from where it penetrates into the sliding joint 62, flows axially through it and, on the opposite side of the sliding joint 62, prevents foreign particles from penetrating the sliding joint 62 and affecting the bearing area.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)

Description

Bezeichnung der Erfindungtitle of the invention

Anlage zur Gewinnung von Fasern aus lignozellulosehaltigem Aufgabegut, insbesondere aus StrohPlant for the extraction of fibres from lignocellulosic feedstock, in particular straw

Gebiet der Technikfield of technology

Die Erfindung betrifft eine Anlage zur Gewinnung von Fasern aus lignozellulosehaltigem Aufgabegut, insbesondere aus Stroh gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a plant for obtaining fibres from lignocellulose-containing feed material, in particular from straw according to the preamble of claim 1.

Stand der TechnikState of the art

Die Gewinnung von Fasern aus lignozellulosehaltigem Material geschieht in der Regel durch mechanischen und/oder chemischen Holzaufschluss, wobei möglichst ganze Fasern aus der zusammenhängenden Holzstruktur des Aufgabeguts herausgelöst werden. In diesem Zusammenhang fallen unter den Begriff "lignozellulosehaltiges Aufgabegut" Stoffe wie insbesondere Hackschnitzel, Einjahrespflanzen, Stroh, Bagasse und vergleichbares. Daraus gewonnene Fasern dienen in nachfolgenden Prozessen unter anderem als Ausgangsstoff für die Produktion von Holzwerkstoffen und dort in beträchtlichem Umfang zur Fertigung von Faserplatten wie MDF-Platten und HDF-Platten. Aber auch zur Herstellung von Papier, Karton, Pappe etc. können derartige Fasern Verwendung finden.The extraction of fibers from lignocellulosic material is usually done by mechanical and/or chemical wood pulping, whereby as many entire fibers as possible are extracted from the coherent wood structure of the feed material. In this context, the term "lignocellulosic feed material" includes materials such as wood chips, annual plants, straw, bagasse and similar. Fibers obtained from these are used in subsequent processes as a starting material for the production of wood materials and, to a considerable extent, for the manufacture of fiberboards such as MDF boards and HDF boards. Such fibers can also be used to produce paper, cardboard, paperboard, etc.

In der EP 3 059 056 A1 ist ein Verfahren zur Herstellung von Holzfaserplatten beschrieben, wobei zunächst Holz zu Holzschnitzeln zerkleinert und dann mittels Wasserdampf in einem Vordämpfbehälter bei einer Temperatur von 100° C bis 180° C und einem Druck von 1 bar bis 10 bar vorbehandelt wird. Die so vorbehandelten Holzschnitzel werden anschließend in einem Refiner in Gegenwart von Wasserdampf bei einer Temperatur von 150° C bis 200° C und einem Druck von 4,5 bar bis 16 bar zu feinen Holzpartikeln zerfasert. Die dabei entstehenden Holzpartikel werden schließlich beleimt und getrocknet und bei einer Temperatur von 170° C bis 240° C zu Holzfaserplatten gepresst. Der Prozess erfolgt im Wesentlichen kontinuierlich, das heißt, dass in einer vorausgehenden Prozessstufe kontinuierlich Aufgabegut in der optimalen Menge für die nachfolgende Prozessstufe zur Verfügung gestellt werden muss.In the EP 3 059 056 A1 A process for the production of wood fibre boards is described, whereby wood is first chopped into wood chips and then pretreated using steam in a pre-steaming container at a temperature of 100° C to 180° C and a pressure of 1 bar to 10 bar. The wood chips pretreated in this way are then refined in the presence of steam at a temperature of 150° C to 200° C and a pressure of 4.5 bar to 16 bar, the wood particles produced are then glued and dried and pressed into wood fiber boards at a temperature of 170° C to 240° C. The process is essentially continuous, which means that in a preceding process stage, feed material must be continuously made available in the optimal amount for the subsequent process stage.

Für die Wirtschaftlichkeit des Verfahrens und die Qualität der hergestellten Produkte ist eine gleichmäßige und störungsfreie Durchströmung des Aufgabeguts durch den Refiner von entscheidender Bedeutung. Um diese zu gewährleisten, ist es bekannt, den zentralen Bereich der rotierenden Mahlscheibe eines Refiners so zu gestalten, dass das über einen Schneckenförderer zentral zugeführte Aufgabegut durch geeignete Profilierung der Mahlscheibenoberfläche möglichst gleichmäßig über den Umfang verteilt dem Mahlspalt aufgegeben und aufgeschlossen wird.A uniform and trouble-free flow of the feed material through the refiner is of crucial importance for the economic efficiency of the process and the quality of the products manufactured. In order to ensure this, it is known to design the central area of the rotating grinding disk of a refiner in such a way that the feed material fed centrally via a screw conveyor is fed into the grinding gap and broken down as evenly as possible over the circumference by suitable profiling of the grinding disk surface.

Aus der AT 510 109 A2 sind zudem ein Verfahren, ein System und ein Refiner zur Mahlung von Aufgabegut in Form von Hackschnitzeln oder Zellstofffasern bekannt, wobei das Aufgabegut mittels eines Trägermediums durch zwei aufeinanderfolgende Mahlungsstufen transportiert wird. Jede Mahlungsstufe umfasst dabei einen Refiner, dem das Aufgabegut über einen Schneckenförderer mit ortsfestem Mantel und rotierendem Kernelement aufgegeben wird. Das Kernelement rotiert mit einer Drehzahl zwischen 1500 U/min und 3000 U/min. AT 510 109 A2 offenbart eine Anlage gemäß dem Oberbegriff des Anspruchs 1.From the AT 510 109 A2 A method, a system and a refiner for grinding feed material in the form of wood chips or pulp fibers are also known, whereby the feed material is transported through two successive grinding stages by means of a carrier medium. Each grinding stage comprises a refiner to which the feed material is fed via a screw conveyor with a stationary casing and rotating core element. The core element rotates at a speed of between 1500 rpm and 3000 rpm. AT 510 109 A2 discloses a system according to the preamble of claim 1.

Ein vergleichbarer Refiner mit Schneckenförderer ist in der WO 96/35016 A1 offenbart. Der Mantel des Schneckenförderers und die darin umlaufende Schneckenwendel sind jeweils konisch ausgebildet. Der Schneckenförderer wird in einem Drehzahlbereich von 1800 U/min bis 2400 U/min betrieben.A comparable refiner with screw conveyor is in the WO 96/35016 A1 disclosed. The casing of the screw conveyor and the screw spiral rotating within it are each conical. The screw conveyor is operated in a speed range of 1800 rpm to 2400 rpm.

Zusammenfassung der ErfindungSummary of the Invention

Vor diesem Hintergrund besteht die Aufgabe der Erfindung darin, bekannte Anlagen und Verfahren zur Gewinnung von Fasern aus lignozellulosehaltigem Material hinsichtlich einer möglichst gleichmäßigen Durchströmung insbesondere des Refiners weiter zu entwickeln.Against this background, the object of the invention is to further develop known plants and methods for obtaining fibers from lignocellulosic material with regard to the most uniform possible flow through the refiner in particular.

Diese Aufgabe wird durch eine Anlage mit den Merkmalen des Anspruchs 1 gelöst. Vorteilhafte Ausführungsformen ergeben sich aus den Unteransprüchen.This object is achieved by a system having the features of claim 1. Advantageous embodiments emerge from the subclaims.

Der Erfindung liegt der Gedanke zugrunde, eine kontinuierliche und über den Umfang der Refinerwerkzeuge einheitliche Beschickung des Refiners mit Aufgabegut nicht erst innerhalb des Refiners zu bewerkstelligen, sondern bereits in dem dem Refiner vorgeschalteten Schneckenförderer vorzubereiten. Dazu wird ein Schneckenförderer ausgelegt, mit einer Drehzahl von mindestens 400 U/min betrieben zu werden. Diese Maßnahme bewirkt, dass sich vom Innenumfang des Schneckentrogs lösende Gutpartikel unmittelbar nach dem Lösen und somit zu einem sehr frühen Zeitpunkt von den schnell rotierenden Schneckenwendeln erfasst und einer Kreis- bzw. Schraubenlinienbewegung unterworfen werden. Die dabei aktivierten Fliehkräfte gewährleisten, dass die Gutpartikel zurück zum Innenumfang des Schneckentrogs getragen werden, so dass die dortige Schicht aus Aufgabegut erhalten bleibt. Auf diese Weise gelingt es, das Aufgabegut bereits im Schneckenförderer in einem konstanten Gutstrom zu bringen, der dem Refiner in Form einer sich gleichmäßig über den gesamten Innenumfangs des Schneckentrogs erstreckenden Gutschicht axial zuführbar ist.The invention is based on the idea of preparing a continuous and uniform feeding of the refiner with feed material over the circumference of the refiner tools, not only within the refiner, but already in the screw conveyor upstream of the refiner. For this purpose, a screw conveyor is designed to operate at a speed of at least 400 rpm. This measure means that material particles that detach from the inner circumference of the screw trough are caught by the rapidly rotating screw flights immediately after they detach and therefore at a very early point in time and are subjected to a circular or helical movement. The centrifugal forces activated in this process ensure that the material particles are carried back to the inner circumference of the screw trough so that the layer of feed material there is retained. In this way, it is possible to bring the feed material in the screw conveyor in a constant material flow, which can be fed axially to the refiner in the form of a material layer that extends evenly over the entire inner circumference of the screw trough.

Bei Ausführungsformen eines Schneckenförderers mit bandförmig ausgebildeten Schneckenwendeln, die die Schneckenwelle in radialem Abstand auf einer Schraubelinie umlaufen, wird gleichzeitig gewährleistet, dass der zentrale, sich zwischen Schneckenwelle und Schneckenwendeln erstreckende Bereich frei von Aufgabegut bleibt und so eine ungehinderte Rückströmung des aus dem Refiner entweichenden Dampfes ermöglicht. Mit der Erfindung wird also eine klare räumliche Trennung des von Aufgabegut durchströmten Bereichs von dem mit Dampf durchströmten Bereich erreicht, so dass Prozessparameter wie zum Beispiel Zuführrate und einheitliche Gutverteilung über den Umfang des Mahlspalts des Refiners innerhalb enger Grenzen eingehalten werden können. Letzen Endes schlagen sich diese Maßnahmen in einer Qualitätssteigerung des Endprodukts aus dem Refiner und im Weiteren der Anlage nieder.In designs of a screw conveyor with belt-shaped screw flights that run around the screw shaft at a radial distance on a screw line, it is simultaneously ensured that the central area extending between the screw shaft and the screw flights remains free of feed material, thus enabling an unhindered backflow of the steam escaping from the refiner. The invention thus achieves a clear spatial separation of the area through which the feed material flows from the area through which steam flows, so that process parameters such as the feed rate and uniform material distribution over the circumference of the grinding gap of the refiner can be maintained within narrow limits. Ultimately, these measures are reflected in an increase in the quality of the end product from the refiner and, furthermore, of the system.

Dies gilt in verstärktem Maße bei der Verarbeitung von Aufgabegut mit geringer Schüttdichte wie zum Beispiel von Einjahrespflanzen, Stroh und dergleichen, die aufgrund ihres geringen spezifischen Gewichts eine erhöhte Tendenz aufweisen, sich vom Gutstrom am Innenumfang des Schneckentrogs loszulösen. Die Schüttdichte solcher Materialien kann beispielsweise weniger als 90 kg/m3 betragen, in besonderen Fällen weniger als 70 kg/m3 oder sogar weniger als 50 kg/m3. Eine erfindungsgemäße Anlage zeichnet sich daher gegenüber dem Stand der Technik durch ein erweitertes Einsatzgebiet aus.This applies to a greater extent when processing feed material with a low bulk density, such as annual plants, straw and the like, which, due to their low specific weight, have an increased tendency to detach from the material flow on the inner circumference of the screw trough. The bulk density of such materials can, for example, be less than 90 kg/m 3 , in special cases less than 70 kg/m 3 or even less than 50 kg/m 3 . A system according to the invention is therefore characterized by an expanded field of application compared to the prior art.

Der mit der Erfindung erzielbare Effekt ist im Wesentlichen abhängig von der Drehzahl der Schneckenwendeln, des Durchmessers der Förderschnecke und dem Schüttgewicht des Aufgabeguts, die aufeinander abzustimmen sind. Durch eine Drehzahlsteigerung verringert sich der Anteil an Gutpartikel, die sich vom Gutstrom lösen. Daneben ermöglicht eine Drehzahlsteigerung unter Umständen erst, dass Aufgabegut mit geringer Schüttdichte mittels eines Schneckenförderers einem Refiner in der erforderlichen Art und Weise zugeführt werden kann. In diesem Sinne bevorzugte Ausführungsformen der Erfindung sind ausgelegt für erhöhte Drehzahlen der Förderschnecke von mindestens 500 U/min, vorzugsweise mindestens 600 U/min, höchstvorzugsweise mindestens 700 U/min.The effect that can be achieved with the invention is essentially dependent on the speed of the screw flights, the diameter of the conveyor screw and the bulk density of the feed material, which must be coordinated with one another. Increasing the speed reduces the proportion of material particles that detach from the material flow. In addition, increasing the speed may make it possible for feed material with a low bulk density to be fed to a refiner in the required manner by means of a screw conveyor. In this sense, preferred embodiments of the invention are designed for increased speeds of the conveyor screw of at least 500 rpm, preferably at least 600 rpm, most preferably at least 700 rpm.

Die von den rotierenden Schneckenwendeln auf die Gutpartikel ausgeübte Beschleunigung in Rotationsrichtung ist außerdem abhängig vom Durchmesser der Förderschnecke, da dieser die Umfangsgeschwindigkeit der Schneckenwendeln mitbestimmt. So führen bei gleicher Drehzahl große Durchmesser zu vergleichsweise höheren Umfangsgeschwindigkeiten als kleine Durchmesser. Unabhängig von der Größe des Durchmessers der Förderschnecke bevorzugt die Erfindung Umfangsgeschwindigkeiten des radial äußeren Wendelumfangs von mindestens 25 m/s, vorzugsweise von mindestens 30 m/s und höchstvorzugsweise von mindestens 40 m/s, woraus sich die oben genannten Vorteile ergeben.The acceleration in the direction of rotation exerted on the material particles by the rotating screw flights is also dependent on the diameter of the conveyor screw, as this determines the circumferential speed of the screw flights. For example, at the same speed, large diameters lead to comparatively higher circumferential speeds than small diameters. Regardless of the size of the diameter of the conveyor screw, the invention prefers circumferential speeds of the radially outer spiral circumference of at least 25 m/s, preferably of at least 30 m/s and most preferably of at least 40 m/s, which results in the advantages mentioned above.

Gemäß der Erfindung ist die Förderschnecke zudem an ihrem austragsseitigen Ende in einem Drehlager gehalten. Dadurch wird dem Problem begegnet, dass die Förderschnecke mit diesem Ende exzentrisch um die Rotationsachse kreist und dabei unter Umständen gegen den Schneckentrog schlägt mit der Gefahr, dass der Schneckenförderer Schaden nimmt. Diese Gefahr verstärkt sich insbesondere mit Zunahme der Drehzahl und/oder Länge der Förderschnecken. Die erfindungsgemäße Anordnung eines Drehlagers am austragseitigen Ende der Förderschnecke ermöglicht einen für Personal und Maschinen gefahrlosen Betrieb einer erfindungsgemäßen Anlage auch bei hohen Drehzahlen und/oder Einsatz langer Förderschnecken. Beispielsweise können mit einem solchen Drehlager problemlos Förderschnecken mit einer Länge von 5 m oder 6 m oder länger betrieben werden.According to the invention, the conveyor screw is also held in a pivot bearing at its discharge end. This solves the problem This means that the conveyor screw circles eccentrically around the axis of rotation with this end and may hit the screw trough, with the risk of damaging the screw conveyor. This risk increases in particular with increasing speed and/or length of the conveyor screws. The inventive arrangement of a rotary bearing at the discharge end of the conveyor screw enables a system according to the invention to be operated without risk for personnel and machines, even at high speeds and/or when long conveyor screws are used. For example, conveyor screws with a length of 5 m or 6 m or longer can be operated without any problem with such a rotary bearing.

Vorzugsweise ist das Drehlager innerhalb des Schneckentrogs oder in der Eintragsöffnung des Refiners angeordnet, also in dem Bereich vor Eintritt in den Refiner. Damit wird in Kauf genommen, dass das Aufgabegut axial durch das Drehlager hindurchströmt, das bei dieser Ausführungsform ein Strömungshindernis für den Gutstrom bildet. Der Vorteil liegt jedoch in einem vergleichsweise geringeren konstruktiven Aufwand hinsichtlich der Lagerung des austragsseitigen Endes der Förderschnecke.Preferably, the rotary bearing is arranged inside the screw trough or in the feed opening of the refiner, i.e. in the area before entering the refiner. This means that the feed material flows axially through the rotary bearing, which in this embodiment forms a flow obstacle for the material flow. The advantage, however, is a comparatively lower design effort regarding the bearing of the discharge end of the conveyor screw.

Zur Befestigung im Schneckentrog oder in der Eintragsöffnung kann das Drehlager vorteilhafterweise eine oder mehrere Streben besitzen, die ausgehend vom achsnahen Lagerbereich sich zum Innenumfang des Schneckentrogs bzw. der Eintragsöffnung erstrecken, wo sie befestigt sind. Um die Belastung der Streben aus dem Gutstrom zu minimieren, kann der Verlauf der Streben von einer radialen Richtung bezüglich der Rotationsachse abweichen, indem das radial innere Ende gegenüber dem radial äußeren Ende in Umfangsrichtung bzw. in der Ebene des Drehlagers versetzt ist, was zu einer leichten Schrägstellung der Streben bzw. zumindest der vom Aufgabegut angeströmten ersten Strebenseite in der Ebene des Drehlagers führt.For fastening in the screw trough or in the inlet opening, the rotary bearing can advantageously have one or more struts which extend from the bearing area near the axis to the inner circumference of the screw trough or the inlet opening, where they are fastened. In order to minimize the load on the struts from the material flow, the course of the struts can deviate from a radial direction with respect to the axis of rotation by offsetting the radially inner end relative to the radially outer end in the circumferential direction or in the plane of the rotary bearing, which leads to a slight inclination of the struts or at least the first strut side against which the feed material flows in the plane of the rotary bearing.

Eine andere bevorzugte Maßnahme zur Minimierung der Belastung der Streben besteht darin, die Geometrie des Strebenquerschnitts in Abhängigkeit der vorhandenen Gutströmung zu gestalten. Zu diesem Zweck kann die der Förderrichtung des Schneckenförderers entgegenweisende zweite Strebenseite gegenüber der in Förderrichtung weisenden dritten Strebenseite in Rotationsrichtung der Schneckenwendeln versetzt sein. Die sich dabei ergebenden, die zweite und dritte Strebenseite verbindenden Flächen sind auf diese Weise parallel zum Gutstrom ausgerichtet, was den vom Drehlager ausgehenden Strömungswiderstand minimiert.Another preferred measure for minimizing the load on the struts is to design the geometry of the strut cross-section depending on the existing material flow. For this purpose, the second strut side facing the conveying direction of the screw conveyor can be offset in the direction of rotation of the screw spirals compared to the third strut side facing in the conveying direction. The resulting surfaces connecting the second and third strut sides are thus aligned parallel to the material flow, which minimizes the flow resistance emanating from the pivot bearing.

Das gleiche Ziel wird mit einer Ausführungsform der Erfindung verfolgt, bei der die dem Gutstrom entgegenweisende zweite Strebenseite, auf die der Gutstrom zunächst trifft, als schmale Anströmkante ausgebildet ist und die Strebenbereiche dahinter demgegenüber breiter.The same aim is pursued with an embodiment of the invention in which the second strut side facing the material flow, which the material flow initially encounters, is designed as a narrow leading edge and the strut areas behind it are wider.

Zur Erhöhnung der Betriebssicherheit bzw. Verlängerung der Reinigungs- und Wartungsintervalle ist optional eine Einrichtung zur Spülung des Lagerbereichs des Drehlagers vorgesehen. Dabei wird ein Spülfluid unter Druck axial durch die konzentrisch die Rotationsachse umlaufende Gleitfuge zwischen rotierender Schneckenwelle und feststehendem Drehlager getrieben, was das Eindringen von Fremdpartikeln in die Gleitfuge und im Weiteren in den Lagerbereich effizient verhindert.To increase operational reliability and extend cleaning and maintenance intervals, an optional device for flushing the bearing area of the rotary bearing is provided. A flushing fluid is forced under pressure axially through the sliding joint that runs concentrically around the axis of rotation between the rotating worm shaft and the fixed rotary bearing, which effectively prevents foreign particles from penetrating the sliding joint and, subsequently, the bearing area.

Ohne sich darauf einzuschränken wird die Erfindung nachstehend anhand eines in der Zeichnung dargestellten Ausführungsbeispiels näher erläutert, wobei weitere Merkmale und Vorteile der Erfindung offenbar werden. Soweit möglich werden dabei für gleiche oder funktionsgleiche Merkmale unterschiedlicher Ausführungsformen gleichlautende Bezugszeichen verwendet.Without being limited thereto, the invention is explained in more detail below using an embodiment shown in the drawing, whereby further features and advantages of the invention become apparent. Where possible, identical reference numerals are used for identical or functionally equivalent features of different embodiments.

Kurze Beschreibung der ZeichnungenShort description of the drawings

Es zeigt

Fig. 1
eine Ansicht auf eine erfindungsgemäße Anlage im Überblick,
Fig. 2
einen Horizontalschnitt durch die in Fig. 1 dargestellte Anlage entlang der dortigen Linie II - II,
Fig. 3
einen Vertikalschnitt durch die in Fig. 2 dargestellte Anlage entlang der dortigen Linie III - III,
Fig. 4
eine Schrägansicht auf eine vorteilhafte Ausführungsform einer Förderschnecke mit Drehlager am austragsseitigen Ende,
Fig. 5
eine Schrägansicht auf eine vorteilhafte Weiterbildung des in Fig. 4 gezeigten Drehlagers mit Förderschnecke,
Fig. 6
eine Ansicht in axialer Richtung auf das in Fig. 5 dargestellte Drehlager in größerem Maßstab, und
Fig. 7
einen Schnitt durch das in Fig. 6 gezeigte Drehlager in größerem Maßstab entlang der dortigen Linie VII - VII.
It shows
Fig. 1
an overview of a system according to the invention,
Fig. 2
a horizontal section through the Fig. 1 shown system along the line II - II,
Fig. 3
a vertical section through the Fig. 2 shown system along the line III - III,
Fig. 4
an oblique view of an advantageous embodiment of a conveyor screw with rotary bearing at the discharge end,
Fig. 5
an oblique view of an advantageous further development of the Fig. 4 shown rotary bearing with conveyor screw,
Fig. 6
a view in axial direction of the Fig. 5 shown pivot bearings on a larger scale, and
Fig. 7
a section through the Fig. 6 shown pivot bearings on a larger scale along the line VII - VII.

Beschreibung der AusführungsformenDescription of the embodiments

Die Fig. 1 und 2 geben einen Überblick über den Aufbau einer erfindungsgemäßen Anlage 1 und das Zusammenwirken deren Komponenten. Mit dem Bezugszeichen 2 ist ein Bunker bezeichnet, in dem das Aufgabegut 20, im vorliegenden Fall Stroh, bevorratet und dabei vorgedämpft und vorgewärmt wird. Über den trichterförmigen Bunkeraustrag 3 gelangt das Aufgabegut 20 in eine Stopfschnecke 4, die es einem Kocher 5 zufördert. Vor dem Eintritt in den Kocher 5 wird das Aufgabegut 20 im Austragsbereich der Stopfschnecke 4 verdichtet und entwässert.The Fig. 1 and 2 give an overview of the structure of a plant 1 according to the invention and the interaction of its components. The reference numeral 2 designates a bunker in which the feed material 20, in this case straw, stored and pre-steamed and pre-heated. The feed material 20 passes through the funnel-shaped bunker discharge 3 into a screw conveyor 4, which conveys it to a cooker 5. Before entering the cooker 5, the feed material 20 is compacted and dewatered in the discharge area of the screw conveyor 4.

Der Kocher 5 ist im Wesentlichen turmartig ausgebildet und wird vom Aufgabegut 20 von oben nach unten durchströmt. Durch Beaufschlagung des Kochers 5 mit Dampf 30 wird das Aufgabegut 20 unter Einwirkung von Druck und Wärme vorbehandelt, mit dem Ziel, ligninhaltige Bestandteile im Aufgabegut 20 zu erweichen und so das Aufgabegut 20 für den Faseraufschluss vorzubereiten. Ein Agitator 47 am Grund des Kochers 5 sorgt dabei für eine ausreichende Durchmischung des Aufgabeguts 20.The cooker 5 is essentially designed like a tower and the feed material 20 flows through it from top to bottom. By applying steam 30 to the cooker 5, the feed material 20 is pretreated under the influence of pressure and heat, with the aim of softening lignin-containing components in the feed material 20 and thus preparing the feed material 20 for fiber extraction. An agitator 47 at the base of the cooker 5 ensures that the feed material 20 is sufficiently mixed.

An das Unterteil des Kochers 5 schließt eine Fördereinrichtung 6 an, die das Aufgabegut 20 einem Refiner 7 zuführt, wo der Faseraufschluss durch Aufbringen von Scherkräften unter Druck und Dampf erfolgt. Wie insbesondere aus Fig. 2 hervorgeht besitzt der Refiner 7 zu diesem Zweck eine Refinereinrichtung mit ringförmig um eine Achse 8 angeordneten feststehenden ersten Refinerwerkzeugen 9 und um die Achse 8 rotierenden zweiten Refinerwerkzeugen 10, die den ersten Refinerwerkzeugen 9 unter Bildung eines Mahlspalts 11 axial gegenüberliegen. Die Antriebseinheit für den Refiner 7 trägt in Fig. 1 das Bezugszeichen 12.A conveyor device 6 is connected to the lower part of the digester 5 and feeds the feed material 20 to a refiner 7, where the fibers are broken down by applying shear forces under pressure and steam. As can be seen in particular from Fig. 2 For this purpose, the refiner 7 has a refiner device with fixed first refiner tools 9 arranged in a ring around an axis 8 and second refiner tools 10 rotating around the axis 8, which are axially opposite the first refiner tools 9 to form a grinding gap 11. The drive unit for the refiner 7 carries in Fig. 1 the reference number 12.

Die beim Durchtritt durch den Mahlspalt 11 mittels der Refinerwerkzeuge 9, 10 gewonnen Fasern 40 werden über eine Blow-Line 15 zu einem nicht weiter dargestellten Trockner geführt. In der Blow-Line 15 erfolgt die Beleimung der Fasern 40, die nach erfolgter Trocknung in eine Form gestreut und zu Holzfaserplatten verpresst werden. Der beschriebene Gesamtprozess läuft kontinuierlich ab.The fibers 40 obtained by passing through the grinding gap 11 by means of the refining tools 9, 10 are led via a blow line 15 to a dryer (not shown in more detail). The fibers 40 are glued in the blow line 15 and, after drying, are scattered into a mold and pressed into wood fiber boards. The entire process described runs continuously.

Aus Fig. 2 geht darüber hinaus hervor, dass die Fördereinrichtung 6 eine dem Kocher 5 zugeordnete Austragsschnecke 13 umfasst, die in das Unterteil des Kochers 5 integriert ist und quer zu ihrer Förderrichtung in einen dem Refiner 7 zugeordneten Schneckenförderer 14 mündet. Die Austragsschnecke 13 umfasst im Wesentlichen einen Schneckentrog 16, in dem eine Schneckenwelle 17 mit Wendel 18 in einer Wellenlagerung 19 drehbar gelagert und über ein Getriebe 21 von einer Antriebseinheit 22 angetrieben ist. Der Schneckentrog 16 verjüngt sich am austragsseitigen Ende leicht, um im Übergang zum Schneckenförderer 14 einen kompakten, dichtenden Gutpfropfen auszubilden. Durch die Anordnung der Austragsschnecke 13 unmittelbar unterhalb der Austragsöffnung 34 des Kochers 5, wird die Austragsschnecke 13 mit dem vorbehandelten Aufgabegut 20 beschickt. Über die Regelung der Drehzahl der Austragsschnecke 13 wird die Durchsatzleistung der Anlage 1 und insbesondere des Refiners 7 eingestellt.Out of Fig. 2 It is also apparent that the conveyor device 6 comprises a discharge screw 13 associated with the digester 5, which is integrated into the lower part of the digester 5 and opens transversely to its conveying direction into a screw conveyor 14 associated with the refiner 7. The discharge screw 13 essentially comprises a screw trough 16, in which a screw shaft 17 with a helix 18 is rotatably mounted in a shaft bearing 19 and is driven by a drive unit 22 via a gear 21. The screw trough 16 tapers slightly at the discharge end in order to form a compact, sealing By arranging the discharge screw 13 directly below the discharge opening 34 of the digester 5, the discharge screw 13 is fed with the pretreated feed material 20. The throughput of the system 1 and in particular of the refiner 7 is adjusted by regulating the speed of the discharge screw 13.

Der zur Beschickung des Refiners 7 mit Aufgabegut 20 dienende Schneckenförderer 14 besitzt einen Schneckentrog 23 mit angeflanschter Wellenlagerung 24 zur Aufnahme einer zur Achse 8 koaxialen Förderschnecke 48 mit Schneckenwelle 25 und zwei Wendeln 29. Das austragsseitige Ende des Schneckentrogs 23 schließt bündig an eine zur Achse 8 konzentrische Eintragsöffnung 26 im Refinergehäuse an. Am gegenüberliegenden Ende des Schneckenförderers 14 ist ein Antrieb 27 über ein Untersetzungsgetriebe 28 kraftschlüssig mit der Schneckenwelle 25 verbunden. Als Antrieb 27 kann ein Elektromotor verwendet werden, dessen Drehzahl im Falle eines zusätzlich vorgesehenen Frequenzumrichters stufenlos einstellbar und regulierbar ist. Alternativ zur Verwendung eines Untersetzungsgetriebes 28 kann die Abtriebswelle des Antriebs 27 direkt mit der Antriebwelle des Schneckenförderers 14 gekoppelt sein, wobei die Drehzahl des Antriebs ebenfalls über einen Frequenzumrichter stufenlos einstellbar und regulierbar ist.The screw conveyor 14 used to feed the refiner 7 with feed material 20 has a screw trough 23 with a flanged shaft bearing 24 for receiving a conveyor screw 48 coaxial with the axis 8 with a screw shaft 25 and two spirals 29. The discharge end of the screw trough 23 is flush with an inlet opening 26 in the refiner housing that is concentric with the axis 8. At the opposite end of the screw conveyor 14, a drive 27 is non-positively connected to the screw shaft 25 via a reduction gear 28. An electric motor can be used as the drive 27, the speed of which can be continuously adjusted and regulated if an additional frequency converter is provided. As an alternative to using a reduction gear 28, the output shaft of the drive 27 can be directly coupled to the drive shaft of the screw conveyor 14, wherein the speed of the drive can also be continuously adjusted and regulated via a frequency converter.

Wie unter anderem aus Fig. 3 ersichtlich sind die beiden parallel verlaufenden Wendeln 29 bandartig ausgebildet und umlaufen die Schneckenwelle 25 schraubenlinienförmig in lichtem radialem Abstand zur Schneckenwelle 23, an der sie über eine Vielzahl radialer Haltearme 31 befestigt sind. Im Betrieb des Schneckenförderers 14 streichen die Wendeln 29 mit ihrem jeweiligen Außenumfang am Innenumfang des Schneckentrogs 21 entlang und nehmen im Zuge ihrer Rotation dort vorhandenes Aufgabegut 20 in axialer Richtung zum Refiner 7 mit.As can be seen from Fig. 3 The two parallel spirals 29 are clearly designed like a band and run around the screw shaft 25 in a helical manner at a clear radial distance from the screw shaft 23, to which they are attached via a plurality of radial holding arms 31. When the screw conveyor 14 is in operation, the spirals 29 move with their respective outer circumference along the inner circumference of the screw trough 21 and, as they rotate, take the feed material 20 present there with them in the axial direction to the refiner 7.

Aufgrund des radialen Abstandes zwischen dem Innenumfang der Wendel 29 und der Schneckenwelle 23 entsteht zwischen diesen Bauteilen ein durchgängiger, sich axial erstreckender Strömungsraum 32, der einen Rückstrom des Dampfes 30 innerhalb des Schneckentrogs 23 parallel zum Gutstrom, aber mit entgegengesetzter Richtung ermöglicht, was aus Fig. 3 deutlicher hervorgeht. Über eine seitliche Öffnung 33 im Schneckentrog 23 entweicht der rückströmende Dampf 30 und wird optional zurück in den Kocher 5 geführt. Die Beschickung des Schneckenförderers 14 erfolgt über eine seitliche Eintragsöffnung 35, in die die Austragsschnecke 13 mündet.Due to the radial distance between the inner circumference of the helix 29 and the screw shaft 23, a continuous, axially extending flow space 32 is created between these components, which enables a return flow of the steam 30 within the screw trough 23 parallel to the material flow, but in the opposite direction, which is Fig. 3 The returning steam 30 escapes through a lateral opening 33 in the screw trough 23 and is optionally fed back into the cooker 5. The screw conveyor 14 is fed via a lateral inlet opening 35 into which the discharge screw 13 opens.

Im Betrieb einer erfindungsgemäßen Anlage 1 wird das vorbehandelte Aufgabegut 20 von der Austragsschnecke 13 dem Schneckenförderer 14 über dessen seitliche Öffnung 35 radial zur Achse 8 dosiert zugeführt und dort von den rotierenden Wendeln 29 erfasst. Die Wendeln 29 nehmen das Aufgabegut 20 zunächst in Rotationsrichtung 49 mit, wodurch Fliehkräfte aktiviert werden, die das Aufgabegut 20 radial nach außen beschleunigen. In der Folge sammelt sich das Aufgabegut 20 am gesamten Innenumfang des Schneckentrogs 23, wo es eine Gutschicht bildet. In dieser Randzone wird das Aufgabegut 20 in Form eines Gutstroms von den Wendeln 29 axial durch die Eintragsöffnung 26 in den Wirkbereich der Refinerwerkzeuge 9, 10 gefördert. Der Gutstrom ist in Fig. 3 durch die Pfeile 36 versinnbildlicht.During operation of a system 1 according to the invention, the pretreated feed material 20 is fed in a metered manner from the discharge screw 13 to the screw conveyor 14 via its lateral opening 35 radially to the axis 8 and is there captured by the rotating spirals 29. The spirals 29 initially take the feed material 20 in the direction of rotation 49, whereby centrifugal forces are activated which accelerate the feed material 20 radially outwards. As a result, the feed material 20 collects on the entire inner circumference of the screw trough 23, where it forms a layer of material. In this edge zone, the feed material 20 is conveyed in the form of a material flow by the spirals 29 axially through the inlet opening 26 into the effective area of the refiner tools 9, 10. The material flow is in Fig. 3 symbolized by the arrows 36.

In dem Mahlspalt 11 zwischen den ersten Refinerwerkzeugen 9 und zweiten Refinerwerkzeugen 10 erfolgt der Aufschluss des Aufgabeguts 20, wobei der dort vorhandene Dampf 30 teilweise mit den aufgeschlossenen Fasern 40 radial aus dem Mahlspalt 11 austritt. Zum anderen Teil strömt der Dampf 40 zurück durch die Eintragsöffnung 35 in den Schneckenförderer 14, wo er im Strömungsraum 32 im Gegenstrom zum Aufgabegut 20 zur Öffnung 33 im Schneckentrog 23 gelangt und von dort in den Kocher 5 zurückgeführt wird. In Fig. 3 verkörpert Pfeil 37 diesen Dampfstrom.The feed material 20 is broken down in the grinding gap 11 between the first refiner tools 9 and the second refiner tools 10, with the steam 30 present there partially exiting radially from the grinding gap 11 with the broken down fibers 40. The other part of the steam 40 flows back through the inlet opening 35 into the screw conveyor 14, where it passes in the flow space 32 in countercurrent to the feed material 20 to the opening 33 in the screw trough 23 and from there is returned to the cooker 5. In Fig. 3 Arrow 37 represents this steam flow.

Die Drehzahl der Schneckenwelle 25 mit Wendeln 29 beträgt mindestens 400 U/min, vorzugsweise mindestens 500 U/min, höchstvorzugsweise mindestens 600 U/min, insbesondere mindestens 700 U/min. In Abhängigkeit des Durchmessers der Wendeln 29 entstehen dabei Umfangsgeschwindigkeiten am äußeren Wendelumfang von mindestens 25 m/s, vorzugsweise mindestens 30 m/s, höchstvorzugsweise von mindestens 35 m/s und insbesondere mehr als 40 m/s.The speed of the worm shaft 25 with spirals 29 is at least 400 rpm, preferably at least 500 rpm, most preferably at least 600 rpm, in particular at least 700 rpm. Depending on the diameter of the spirals 29, circumferential speeds on the outer spiral circumference of at least 25 m/s, preferably at least 30 m/s, most preferably at least 35 m/s and in particular more than 40 m/s arise.

Aufgrund einer Kreisbewegung mit derart hoher Umfangsgeschwindigkeiten wird sichergestellt, dass Partikel des Aufgabeguts 20 im Bereich des Schneckenförderers 14, die sich vom Innenumfang des Schneckentrogs 23 lösen, nicht radial nach innen in den Strömungsraum 32 gelangen, wo sie den dort zurückströmenden Dampf 40 behindern und gegebenenfalls von diesem mitgenommen würden. Stattdessen werden die Partikel des Aufgabeguts 20 aufgrund der aufgezwungenen Kreisbewegung und der damit wirksam werdenden Fliehkräfte am Innenumfang des Schneckentrogs 23 gehalten, wo sie eine Gutschicht bilden und entlang des Innenumfangs von den Wendeln 29 in axialer Richtung bis zum Ende des Schneckenförderers 14 transportiert werden. Insbesondere bei der Verarbeitung von Aufgabegut 20 mit geringer Schüttdichte wie zum Beispiel Stroh lässt sich auf diese Weise der Rückströmungsraum 32 weitestgehend frei von Aufgabegut 20 halten und die Gutschicht am Innenumfang des Schneckentrogs 23 bleibt intakt, was für eine gleichmäßige Beschickung des Refiners von Bedeutung ist.Due to a circular movement with such high peripheral speeds, it is ensured that particles of the feed material 20 in the area of the screw conveyor 14, which detach from the inner circumference of the screw trough 23, do not reach radially inwards into the flow space 32, where they would hinder the steam 40 flowing back there and possibly be carried away by it. Instead, the particles of the feed material 20 are held on the inner circumference of the screw trough 23 due to the forced circular movement and the centrifugal forces that come into effect as a result, where they form a layer of material and are transported along the inner circumference by the spirals 29 in the axial direction to the end of the screw conveyor 14. In particular when processing feed material 20 with a low bulk density such as straw, the return flow space 32 can be kept largely free of feed material 20 in this way and the layer of material on the inner circumference of the screw trough 23 remains intact, which is important for uniform feeding of the refiner.

Fig. 4 zeigt eine Ausführungsform eines Schneckenförderers 14', die im Wesentlichen der vorbeschriebenen Ausführungsform entspricht, so das zur Vermeidung von Wiederholungen auf obige Ausführungen verwiesen wird. Wesentlicher Unterschied dieser Ausführungsform ist die Lagerung der Scheckenwelle 25 am austragsseitigen Ende des Schneckenförderers 14' in einem Drehlager 38. Das Drehlager 38 ist starr mit dem Schneckentrog 23 oder dem Refiner 7 verbunden, beispielsweise am Innenumfang des Schneckentrogs 23 oder im Bereich der Eintragsöffnung 26 im Refinergehäuse. Fig. 4 shows an embodiment of a screw conveyor 14', which essentially corresponds to the embodiment described above, so that reference is made to the above statements to avoid repetition. The main difference in this embodiment is the mounting of the screw shaft 25 at the discharge end of the screw conveyor 14' in a pivot bearing 38. The pivot bearing 38 is rigidly connected to the screw trough 23 or the refiner 7, for example on the inner circumference of the screw trough 23 or in the area of the inlet opening 26 in the refiner housing.

Das Drehlager 38 ist als Wälzlager ausgebildet, dessen rotierender Innenring 39 drehfest auf dem Ende der Schneckenwelle 25 sitzt und dessen feststehender Außenring 41 über drei Streben 42 im Zentrum eines Befestigungsringes 43 gehalten ist. Der Befestigungsring 43 liegt beispielsweise lagefixiert mit seinem Außenumfang am Innenumfang des Schneckentrogs 23 an, der in diesem Bereich aufgeweitet sein kann, oder ist zwischen Schneckenförderer 14' und Refinergehäuse montiert oder in die Eintragsöffnung 26 des Refinergehäuses eingesetzt.The pivot bearing 38 is designed as a roller bearing, the rotating inner ring 39 of which is seated in a rotationally fixed manner on the end of the screw shaft 25 and the stationary outer ring 41 of which is held in the center of a fastening ring 43 via three struts 42. The fastening ring 43 is, for example, fixed in position with its outer circumference on the inner circumference of the screw trough 23, which can be widened in this area, or is mounted between the screw conveyor 14' and the refiner housing or is inserted into the inlet opening 26 of the refiner housing.

Fig. 4 zeigt zudem, dass die Streben 42 jeweils eine entgegen der Rotationsrichtung 49 der Wendeln 29 weisende erste Strebenseite 44 besitzen, deren radial inneres Strebenende gegenüber ihrem radial äußeren Strebenende entgegen der Rotationsrichtung 49 versetzt ist. Die erste Strebenseite 44 der Streben 42 verläuft auf dabei in etwa tangential zum rotierenden Innenring 39 und weicht somit von einer radialen Ausrichtung um einen Winkel ab, der beispielsweise zwischen 5° und 15° liegen kann und vorzugsweise 10° beträgt. Fig. 4 also shows that the struts 42 each have a first strut side 44 pointing against the direction of rotation 49 of the spirals 29, the radially inner strut end of which is offset from its radially outer strut end against the direction of rotation 49. The first strut side 44 of the struts 42 runs approximately tangentially to the rotating inner ring 39 and thus deviates from a radial alignment by an angle which can be between 5° and 15°, for example, and is preferably 10°.

Die Fig. 5 und Fig. 6 betreffen eine Weiterbildung des Drehlagers 38', bei dem die Streben 42' der Richtung des Gutstroms 36 in diesem Bereich angepasst sind. Man erkennt, dass die Streben 42' jeweils eine der Förderrichtung des Schneckenförderers 14 entgegenweisende zweite Strebenseite 45 aufweisen und eine in Förderrichtung weisende dritte Strebenseite 46. Die zweite Strebenseite 45 und dritte Strebenseite 46 liegen also auf den einander abgewandten Seiten der Streben 42'. Dabei ist die dritte Strebenseite 46 gegenüber der zweiten Strebenseite 45 in Rotationsrichtung 49 der Förderschnecke 48 versetzt, was dazu führt, dass die die zweite Strebenseite 45 und dritte Strebenseite 46 verbindenden Flächen in etwa parallel zum dortigen Gutstrom verlaufen. Auf diese Weise bilden die die Streben 42' ein minimalen Strömungswiderstand für das durch das Drehlager 38' hindurchtretende Aufgabegut 20.The Fig. 5 and Fig. 6 relate to a further development of the pivot bearing 38', in which the struts 42' are adapted to the direction of the material flow 36 in this area. It can be seen that the struts 42' each have a second strut side 45 pointing in the opposite direction to the conveying direction of the screw conveyor 14 and a third strut side 46 pointing in the conveying direction. The second strut side 45 and third strut side 46 are therefore located on the opposite sides of the struts 42'. The third strut side 46 is offset from the second strut side 45 in the direction of rotation 49 of the conveyor screw 48, which means that the surfaces connecting the second strut side 45 and third strut side 46 run approximately parallel to the material flow there. In this way, the struts 42' form a minimal flow resistance for the feed material 20 passing through the pivot bearing 38'.

Gegenstand von Fig. 7 ist eine Ausführungsform eines Schneckenförderers 14, bei dem das Drehlager 38" mit eine Spüleinrichtung zum Schutz des Lagerbereichs vor eindringenden Fremdpartikel ausgerüstet ist. Man sieht lediglich den Endabschnitt der Förderschnecke 48', die in dem Drehlager 38" drehbar gehalten ist und sich über das Drehlager 38" am Innenumfang des lediglich angedeuteten Schneckentrogs 23 abstützt.subject of Fig. 7 is an embodiment of a screw conveyor 14 in which the rotary bearing 38" is equipped with a flushing device to protect the bearing area from penetrating foreign particles. Only the end section of the conveyor screw 48' is visible, which is rotatably held in the rotary bearing 38" and is supported via the rotary bearing 38" on the inner circumference of the merely indicated screw trough 23.

Das koaxial zur Achse 8 angeordnete Drehlager 38" entspricht hinsichtlich des Befestigungsrings 43 und der Streben 42' dem unter den Fig. 5 und 6 beschriebenen, so dass das dort Gesagte entsprechend gilt. Unterschiede bestehen vor allem im Anschluss an die Förderschnecke 48', was im Einzelnen noch erläutert wird.The pivot bearing 38" arranged coaxially to the axis 8 corresponds with regard to the fastening ring 43 and the struts 42' to the Fig. 5 and 6 described, so that what is said there applies accordingly. Differences exist above all in the connection to the conveyor screw 48', which will be explained in more detail below.

Der in Fig. 7 dargestellte Endabschnitt der Förderschnecke 48' des Schneckenförderers 14 lässt erkennen, dass es sich bei der um die Achse 8 rotierende Schneckenwelle 25 um eine Hohlwelle handelt, deren Wandung am Ende gestuft ausgebildet ist mit einer endseitigen ersten Ausdrehung 51 größeren Durchmessers und einer daran axial anschließenden zweiten Ausdrehung 52 geringeren Durchmessers. In Inneren der Schneckenwelle 25 verläuft ein koaxiales, mitrotierendes Spülrohr 53, über das dem Lagerbereich ein mit Druck beaufschlagtes Spülfluid 54 zuführbar ist. Das Ende des Spülrohrs 53 ist in einer zylindrischen Lagerscheibe 55 fixiert, die zu diesem Zweck eine zur Achse 8 koaxiale Durchgangsbohrung 56 besitzt, welche das Spülrohr 53 vollständig durchsetzt. Dabei sitzt die Lagerscheibe 55 form- und kraftschlüssig in der zweiten Ausdrehung 52 der Schneckenwelle 25.The in Fig. 7 The end section of the conveyor screw 48' of the screw conveyor 14 shown shows that the screw shaft 25 rotating about the axis 8 is a hollow shaft, the wall of which is stepped at the end with a first recess 51 of larger diameter at the end and a second recess 52 of smaller diameter axially adjacent to it. A coaxial, co-rotating flushing pipe 53 runs inside the screw shaft 25, via which a pressurized flushing fluid 54 can be fed to the bearing area. The end of the flushing pipe 53 is fixed in a cylindrical bearing disk 55, which for this purpose has a through hole 56 coaxial to the axis 8. which completely penetrates the flushing pipe 53. The bearing disk 55 sits in a form-fitting and force-fitting manner in the second recess 52 of the worm shaft 25.

Auf der dem Drehlager 38" zugewandten Seite der Lagerscheibe 55 ist in die zweite Ausdrehung 52 zusätzlich ein ebenfalls mitrotierender, zur Achse 8 rotationssymmetrischer Spülkopf 57 eingesetzt, der sich mit seinem Außenumfang an der zweiten Ausdrehung 52 abstützt und mit einem koaxialen zylindrischen Ansatz 58 in eine komplementär geformte Ausnehmung 59 in der Lagerscheibe 55 eingreift. In Richtung zum Drehlager 38" setzt sich der Spülkopf 57 in einem koaxialen Lagerzapfen 60 geringeren Durchmessers fort, auf dessen Ende schließlich der Innenring 39 eines Wälzlagers sitzt.On the side of the bearing disk 55 facing the pivot bearing 38", a flushing head 57 is additionally inserted into the second recess 52, which also rotates and is rotationally symmetrical to the axis 8. The flushing head 57 is supported with its outer circumference on the second recess 52 and engages with a coaxial cylindrical projection 58 in a complementarily shaped recess 59 in the bearing disk 55. In the direction of the pivot bearing 38", the flushing head 57 continues in a coaxial bearing journal 60 of smaller diameter, on the end of which the inner ring 39 of a rolling bearing is finally seated.

In die erste Ausdrehung 51 ist eine ebenfalls rotationssymmetrisch ausgebildete Lagerhülse 61 eingesetzt, die mit ihrem axial äußeren, dem Drehlager 38" zugewandten Endabschnitt form- und kraftschlüssig in der zentrische Öffnung 68 des Drehlagers 38" befestigt ist und mit ihrem axial gegenüberliegenden inneren Endabschnitt unter Bildung einer umlaufenden Gleitfuge 62 in der ersten Ausdrehung 51 der Schneckenwelle 25 angeordnet ist. Die zentrische Öffnung 68 ist mit einer Abdeckung 69 dicht verschlossen. Im Bereich des inneren Endabschnitts weist die Lagerhülse 61 eine sich radial nach innen erstreckende Ringschulter 63 auf, die bis an den Umfang des Lagerzapfens 60 heranreicht und mit diesem eine Gleitdichtung 64 ausbildet.A bearing sleeve 61, which is also rotationally symmetrical, is inserted into the first recess 51 and is secured with its axially outer end section facing the pivot bearing 38" in a form-fitting and force-fitting manner in the central opening 68 of the pivot bearing 38" and is arranged with its axially opposite inner end section in the first recess 51 of the worm shaft 25, forming a circumferential sliding joint 62. The central opening 68 is tightly closed with a cover 69. In the area of the inner end section, the bearing sleeve 61 has a radially inwardly extending annular shoulder 63 which reaches up to the circumference of the bearing journal 60 and forms a sliding seal 64 with it.

Die sich axial gegenüberliegenden Stirnflächen von Spülkopf 57 und Lagerhülse 61 halten einen axialen Abstand ein, wodurch ein den Lagerzapfen 60 umgebender Ringraum 65 gebildet wird. Zur Beaufschlagung des Ringraums 65 mit dem Spülfluid 54 ist in axialer Verlängerung des Spülrohrs 53 eine Blindbohrung 66 in den Spülkopf 57 eingebracht, die an ihrem Grund über eine Anzahl schräg nach außen verlaufender Kanäle 67 mit dem Ringraum 65 verbunden ist.The axially opposite end faces of the flushing head 57 and the bearing sleeve 61 maintain an axial distance, whereby an annular space 65 is formed surrounding the bearing journal 60. In order to supply the annular space 65 with the flushing fluid 54, a blind bore 66 is made in the flushing head 57 in the axial extension of the flushing pipe 53, which is connected at its base to the annular space 65 via a number of channels 67 running obliquely outwards.

Das über das Spülrohr 53 und den Spülkopf 57 unter Druck zugeführte Spülfluid 54 verteilt sich gleichmäßig im Ringraum 65, von wo es in Gleitfuge 62 eindringt, diese axial durchströmt und auf der gegenüberliegenden Seite der Gleitfuge 62 verhindert, dass Fremdpartikel in die Gleitfuge 62 eindringen und den Lagerbereich beeinträchtigen.The flushing fluid 54 supplied under pressure via the flushing pipe 53 and the flushing head 57 is evenly distributed in the annular space 65, from where it penetrates into the sliding joint 62, flows axially through it and, on the opposite side of the sliding joint 62, prevents foreign particles from penetrating the sliding joint 62 and affecting the bearing area.

Claims (10)

  1. A plant for obtaining fibers (40) from lignocellulose-containing feedstock (20), having
    - a digester (5) for pretreating the feedstock (20) under the influence of heat, pressure and moisture,
    - a refiner (7) for defibering the pretreated feedstock (20) by means of two refiner tools (9, 10) rotating coaxially relative to one another in the refiner housing and forming a grinding gap (11), and having
    - a conveying device (6) for conveying the pretreated feedstock (20) from the digester (5) to the refiner (7), wherein the conveying device (6) comprises a worm conveyor (14) with a worm trough (23) and a screw conveyor (48) rotating therein with at least one worm helix (29), which opens axially into the refiner (7) via an inlet opening (26) in the refiner housing,
    wherein the screw conveyor (48) of the worm conveyor (14) is driven at a speed of at least 400 rpm, characterized in that the screw conveyor of the worm conveyor is mounted at its discharge end in a pivot bearing (38, 38').
  2. The plant according to claim 1, characterized in that the speed is at least 500 rpm, preferably at least 600 rpm, most preferably at least 700 rpm.
  3. The plant according to claim 1 or 2, characterized in that the peripheral speed of the at least one worm helix (29) is more than 25 m/s, preferably more than 30 m/s, most preferably more than 35 m/s, in particular more than 40 m/s.
  4. The plant according to one of the claims 1 to 3, characterized in that the at least one worm helix (29) is belt-shaped and rotates around the worm shaft (25) at a clear radial distance, forming an axial flow space (32).
  5. The plant according to one of the claims 1 to 4, characterized in that the pivot bearing (38, 38') is fixed by means of one or more struts (42) within the worm trough (23) or the inlet opening (26) to the refiner (7).
  6. The plant according to claim 5, characterized in that the struts (42, 42') are inclined relative to a radial alignment to the pivot bearing axis (8), wherein in each case the radially inner strut end is arranged to be offset relative to the radially outer strut end counter to the direction of rotation (49) of the screw conveyor (48).
  7. The plant according to claim 5 or 6, characterized in that the struts (42') each have a second strut side (45) pointing in the opposite direction to the conveying direction of the worm conveyor and a third strut side (46) pointing in the conveying direction, wherein the second strut side (45) is offset relative to the third strut side (46) in the direction of rotation (49) of the screw conveyor (48).
  8. The plant according to one of the claims 5 to 7, characterized in that the struts (42, 42') each have a cross-section which, relative to the direction of flow of the feedstock (20) in the region of the pivot bearing (38, 38'), has a cross-section with a narrow leading edge which widens in the direction of flow.
  9. The plant according to one of the claims 1 to 8, characterized in that the pivot bearing (38") has a flushing device for flushing the bearing area with a flushing fluid (54).
  10. The plant according to claim 9, characterized in that the worm shaft (25) is designed as a hollow shaft and the flushing fluid (54) is fed to the pivot bearing (38") inside the worm shaft (25).
EP22705808.8A 2021-02-15 2022-02-15 Apparatus and method for reclamation of fibres from feedstock containing lignocellulose, in particular from straw Active EP4291705B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021103529 2021-02-15
PCT/EP2022/053716 WO2022171905A1 (en) 2021-02-15 2022-02-15 System and method for obtaining fibres from feedstock containing lignocellulose, more particularly from straw

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EP4291705A1 EP4291705A1 (en) 2023-12-20
EP4291705C0 EP4291705C0 (en) 2024-11-06
EP4291705B1 true EP4291705B1 (en) 2024-11-06

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EP (1) EP4291705B1 (en)
ES (1) ES3011858T3 (en)
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Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE403916B (en) * 1975-06-04 1978-09-11 Rolf Bertil Reinhall DEVICE FOR MILLING APPARATUS FOR LIGNOCELLULOSE-MATERIAL
SE413522B (en) * 1977-01-03 1980-06-02 Reinhall Rolf Bertil DEVICE FOR THE PREPARATION OF FIBER MASS OF LIGNOCELLULOSALLY MATERIAL
US5626300A (en) * 1995-05-03 1997-05-06 Andritz Sprout-Bauer, Inc. Disc refiner with conical ribbon feeder
FI122243B (en) * 2009-03-17 2011-10-31 Metso Paper Inc Process and system for refining wood shavings or pulp fibers
EP3059056A1 (en) 2015-02-23 2016-08-24 Basf Se Method for producing wood fibres and wood fibre boards

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EP4291705C0 (en) 2024-11-06
WO2022171905A1 (en) 2022-08-18
PL4291705T3 (en) 2025-03-24
EP4291705A1 (en) 2023-12-20

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