EP0081380B1 - Verfahren und Vorrichtung zur Mahlen von Pulpholz und Holzspanen durch Fliehkraft - Google Patents

Verfahren und Vorrichtung zur Mahlen von Pulpholz und Holzspanen durch Fliehkraft Download PDF

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Publication number
EP0081380B1
EP0081380B1 EP82306519A EP82306519A EP0081380B1 EP 0081380 B1 EP0081380 B1 EP 0081380B1 EP 82306519 A EP82306519 A EP 82306519A EP 82306519 A EP82306519 A EP 82306519A EP 0081380 B1 EP0081380 B1 EP 0081380B1
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EP
European Patent Office
Prior art keywords
grinding surface
rotor
water
grinding
centrifugal
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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.)
Expired
Application number
EP82306519A
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English (en)
French (fr)
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EP0081380A2 (de
EP0081380A3 (en
Inventor
John A. Wildey
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Amca International Ltd
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Amca International Ltd
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Priority claimed from US06/383,713 external-priority patent/US4474335A/en
Application filed by Amca International Ltd filed Critical Amca International Ltd
Publication of EP0081380A2 publication Critical patent/EP0081380A2/de
Publication of EP0081380A3 publication Critical patent/EP0081380A3/en
Application granted granted Critical
Publication of EP0081380B1 publication Critical patent/EP0081380B1/de
Expired legal-status Critical Current

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    • 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
    • D21B1/24—Disintegrating in mills in magazine-type machines of the pocket type

Definitions

  • the present invention relates to a method and apparatus for grinding pulpwood and/or wood chips, in which the force urging the wood against the grinding surface arises centrifugally.
  • the present method and apparatus also includes various other features and advantages, which will be dealt with in detail below.
  • ground wood pulp for the manufacture of paper products involves pressing a batch of pulpwood (roundwood or wood chips) against a rotating grinding stone while simultaneously feeding shower water into the grinding chamber, specifically by spraying the water directly on the surface of the stone at a location spaced from the actual grinding location.
  • a dam or weir By means of a dam or weir, the formed ground wood stock, which is an aqueous slurry of pulp, is kept in the grinding chamber at a level a little higher than the lower point of the stone in order to clean, lubricate and cool the stone.
  • the ground wood stock flowing over the dam is discharged by its own weight for further treatment.
  • a variant of the foregoing is the "pitless" method, in which the stone is not immersed, and provision is made for extra water showers.
  • Another known method utilizes a disc refiner, in which material being refined or reduced is worked between two closely spaced opposed discs which undergo relative rotation.
  • Oy Tampella Ab In an attempt to overcome the problem just defined, additional developments have been made and patented by Oy Tampella Ab, as exemplified in CA-A-1,097,118 US-A-4,270,703 and 4,274,600.
  • a feed chamber upstream of the grinding chamber has two pressure seals, one to the atmosphere and one to the grinding chamber.
  • the feed chamber acts as a double-lock seal, to allow the pressure in the grinding chamber always to be maintained above atmospheric.
  • the pressure in the grinding chamber may reach as high as several bar, and temperatures at the grinding stone surface may climb well above the standard pressure boiling point.
  • a different approach to the grinding of wood pulp is one in which the grinding pressure between the wood and the grinding surface is brought about centrifugally, by providing an internal cylindrical grinding surface, and by "flinging" the wood outwardly against the stationary grinding surface through the use of centrifugal force.
  • the centrifuging action not only would allow the appropriate pressure to arise between the wood and the grinding surface, but could also pressurize a quantity of water being swept around along with the wood, thus permitting higher temperatures than the maximum attainable in the standard SGW process.
  • AT-A-1 18 812 discloses a centrifugal grinder, comprising an internal grinding surface in the shape of a surface of revolution, and a rotor mounted for rotation coaxially with said grinding surface, the rotor having a central cavity and defining at least two pockets through which material in the central cavity can contact the grinding surface, the pockets being distributed around the rotor.
  • the rotor is provided with means for applying water to said grinding surface, this means including a first water pathway in the rotor adjacent the axis thereof, and, for each pocket, a second water pathway in the rotor adjacent the grinding surface and trailing the respective pocket in the sense of rotation, a water passage means joining the first pathway to each second pathway, and nozzle means communicating with each second pathway for spraying water against the grinding surface, each second path being further than the first pathway from the rotor axis, whereby rotation of the rotor increases the water pressure in the nozzle means with respect to that in the first pathway, due to the centrifugal effect.
  • the present invention also provides a method of grinding a wood material against an internal grinding surface in the shape of a surface of revolution, in which the material is circulated around the internal grinding surface in a plurality of discrete and circumferentially separated pockets to generate centrifugal grinding force between the material and the surface, characterised in that the grinding surface is sprayed with water from nozzle means adjacently behind each pocket with respect to the direction of rotation and rotating with that pocket to remove wood fibers therefrom and to create a slurry, the centrifugal effect increasing water pressure at said nozzle means.
  • Figure 1 the left hand portion is an axial sectional view of a centrifugal pulpwood grinder 10 which includes a cap-like top frame 12, a cylindrical outer stone mounting frame 14 having two outwardly extending flanges 15 and 16 at its opposite ends, and a bottom frame 18 which will be described in greater detail below.
  • a centrifugal pulpwood grinder 10 which includes a cap-like top frame 12, a cylindrical outer stone mounting frame 14 having two outwardly extending flanges 15 and 16 at its opposite ends, and a bottom frame 18 which will be described in greater detail below.
  • Securely mounted within the stone mounting frame are a plurality of stone segments 20 which provide a radially symmetrical, concave, cylindrical, inside grinding surface 22.
  • the stone segments may be of hexagonal shape.
  • a drive shaft 27 Mounted centrally of the grinding chamber 24 on conical bearings of which one is shown in Figure 1 at the numeral 26 is a drive shaft 27, to which a rotary hub 28 is affixed by means of a key 29.
  • Extending substantially radially away from the hub 28 are two or three hollow arms 30 adapted to propel the pulpwood circumferentially along and around the grinding surface 22.
  • each arm 30 rotates about the axis 31 in the direction of the arrow 32, and undergoes a gradual curvature so that its distal portion 34 slopes toward the rear compared to the direction of rotation.
  • the distal portion 34 has a plurality of engagement teeth 36 along its forward surface, the teeth 36 being adapted to engage a piece of pulpwood 38 in order to stabilize the same as it rotates against the grinding surface 22, and in order to minimize bounce or rolling of the pulpwood 38.
  • the hollow arm has, at its distal end, an adjustable finger bar 40, which may be a stainless steel casting, which is adapted to ride in close proximaty to the grinding surface 22 to ensure that the slurry of water and ground pulp in the vicinity of the pulpwood 38 will also be swept circumferentially around the grinding surface 22, and thus “flung" outwardly against the grinding surface 22 by reason of the centrifugal force.
  • an adjustable finger bar 40 which may be a stainless steel casting, which is adapted to ride in close proximaty to the grinding surface 22 to ensure that the slurry of water and ground pulp in the vicinity of the pulpwood 38 will also be swept circumferentially around the grinding surface 22, and thus “flung” outwardly against the grinding surface 22 by reason of the centrifugal force.
  • the bottom frame 18 includes a shredder shown generally by the numeral 43, the shredder 43 including a stator 45 and rotor 47, the rotor being an integral part of a disk-like rotating bottom wall 48 which is integral with the hub 28.
  • the rotor 47 is provided with a plurality of slots, as is also the stator 45, and the openings 46 of the two sets of slots pass across each other at high speeds, thus shredding the ground pulp material through a type of scissors or shearing action.
  • the purpose of the shredding is to break up slivers which would otherwise tend to propagate a downstream jamming condition.
  • the bottom frame 18 includes a wall 50 defining a volute constituted an evacuation zone for thu pulp slurry.
  • An opening (not shown) is provided for removing the pulp slurry from the evacuation zone.
  • a bearing seal is shown generally by the numeral 53, and includes a stationary ring 54 of L-shape, which is urged upwardly against the bottom of an annular downward projection 56 integral with the hub 28 by a spring 57.
  • annular plate 59 At the top of the hollow arms 30 is an annular plate 59 which, along with the portion 48, defines a containment zone for the aqueous pulp slurry which results from the grinding process.
  • each arm 30, while connected to the hub 28, also has a free inner edge 61 which terminates at the inner circumference 62 of the annular plate 59. Thus, there is defined a central opening 64 into which the pieces of pulpwood 38a can fall.
  • the hub 28 may not require the length shown in Figure 1, and may terminate at a location closer to the key 29. It is also contemplated that the entire grinding chamber 24 could be additionally pressurized above atmospheric by the use of single or double seals (not shown), so that the pressure undergone by the aqueous slurry being centrifuged around and against the grinding surface 22 would be greater than atmospheric by reason of both the centrifugal effect and the additional pressurization.
  • Figures 1 and 2 While the embodiment shown in Figures 1 and 2 is adapted for vertical orientation, i.e. with the axis of rotation extending vertically, the arrangement shown schematically in Figure 3 is shown in a horizontal orientation.
  • the purpose of Figure 3 is essentially to show how water can be ducted into a location adjacent the grinding surface 22a, and that the centrifuging effect of the rotation of the arms 30 will also produce an increase in the pressure of the water available at nozzles 67.
  • a water supply arrangement similar to that of Figure 3 is provided in the embodiment of Figures 1 and 2, although not shown in those Figures.
  • an electric motor 71 rotates the input shaft 72 of a reduction gear box 74, of which the output shaft 75 rotates the hollow arms that are represented in Figure 3 merely by the water piping 77.
  • a cylindrical, internal grinding surface 90 is defined by cylindrical sections of suitable stone 92, which are retained in place by a stone retaining frame 94.
  • a housing 96 Connected in a sealed manner with the stone retaining frame 94 is a housing 96, which is sealed at the left in Figure 4 with respect to a bearing housing 99, and is sealed at the right in Figure 4 wtih respect to a bearing housing 101.
  • the bearing housing 101 at the right in Figure 4 is connected to a pilot shaft bearing housing 104 containing a series of roller bearing 105 which centrally support a pilot shaft 107 for rotation about a central axis 109.
  • the bearing housing 99 is connected to a drive shaft bearing housing 112 of conventional construction which supports two roller bearings 113 and 115, which centrally support for rotation a low speed drive shaft 117 which, together with the pilot shaft 107, securely supports a rotor 120 for rotation about the axis defined by the line 109.
  • the rotor 120 consists essentially of two end plates 122 and 123, which support between them two axially extending sickle-shaped members 125 and 126 (see Figure 5). More specifically, each of the sickle-shaped members 125 and 126 includes an outwardly extending portion 129, and a substantially part-cylindrical portion 131 which is eccentrically located with respect to the axis 109 of the rotor per se. More specifically, looking at Figure 5, the center of curvature of the leftward part-cylindrical portion 131 is located at 134, while the center of curvature of the rightward part-cylindrical portion 131 is located at 136.
  • the logs As the logs come into contact with the members 125 and 126, since the portions 131 thereof become progressively further and further from the axis 109 in the counter-clockwise direction as pictured in Figure 5, the logs likewise will tend to roll or move in the counter clockwise direction with respect to members 125 and 126, thus approaching the end regions thereof, where there is a spacing between the members 125 and 126, the spacing being such as to allow the logs to move outward under centrifugal force and contact the inside cylindrical surface 90 of the grinding stone segments.
  • the rotor design shown in Figure 5 provides a "fluid centre" which avoids a situation developing wherein one pocket is fully loaded while the other one, which may be empty, cannot accept logs because its entrance is blocked.
  • a guide plate 143 which terminates close to the internal grinding surface 90.
  • a finger bar 145 which serves the purpose of retaining the aqueous slurry constituted by the groundwood stock and the water added thereto, rotating about and against the internal grinding surface 90.
  • the finger bars 145 are shaped to assist in the evacuation of the pulp to the sides of the stone.
  • a suitable configuration for the finger bar at 145 is that described in CA-A-947,555, to Koehring--Waterous Ltd.
  • the outer plates 122 and 123 of the rotor 120 are shaped as illustrated in Figure 5, the shape being essentially circular but having two outwardly extending antipodal ears 147.
  • the ears 147 are intended to restrict the egress of unwanted slivers. This causes the slivers to remain in the grinding zone and ensures that they are ground out.
  • the nominal outer periphery 150 of the plates 122 and 123 has a smaller diameter than the internal grinding surface 90, thus leaving a gap 152 therebetween, through which pulpwood stock can escape from the internal grinding surface 90.
  • the ears 147 extend outwardly beyond the radius of the internal grinding surface 90, and thus overlap the grinding stones segments.
  • each grinding cavity being defined laterally by two ears 147, outwardly by the grinding surface 90, forwardly by the plate 143 of one of the members 125 and 126, and rearwardly by the portion 129 and finger bar 145 of the other of the members 125 and 126.
  • the logs are flung or urged centrifugally into these grinding cavities, and are there ground into stock.
  • bearing housings 99 and 101 define the outer limit for two annular stock/oil mechanical seals 156, which bear internally against the low speed drive shaft 117 and the pilot shaft 107 respectively.
  • the housing 96 defines the upper portion of a chamber within which the rotor 120 rotates, the chamber retaining the pulpwood stock and directing it downwardly.
  • the lower part of the chamber may, as illustrated in Figures 4 and 5, be located below the level of the mill floor 158 in a stock sump 160 provided therein.
  • a stock exit passage way 162 At the bottom of the stock sump 160 is a stock exit passage way 162, which leads to a further processing step for the stock (this being of no concern to the present invention).
  • Figure 6 shows an outside end view of the plate 123, being that on the left in Figure 4.
  • Figure 6 shows that the leftward plate 123 includes in its periphery a recess 171, but that otherwise the plate 123 has the same shape as the plate 122 shown in Figure 5.
  • Connected between the two plates 122 and 123 is an inverted V-shaped finger bar holder 173 to which is securely bolted or clamped a secondary finger bar 175, also of inverteu V-shaped.
  • Figure 6 shows three fastening assemblies 178, which may be in the form of clamps or bolts.
  • Figure 7 shows a direct elevational view of the rotor 120, seen from a direction which shows the secondary finger bar 175 and its holder 173 in true shape.
  • the secondary finger bar 175 consists of two plate elements, each with a curving outside edge 181, having the same curvature as the internal grinding surface 90.
  • the secondary finger bar 175 is considered an advantage in that it avoids too great a build-up of groundwood pulp stock on the internal grinding surface 90. Such a build-up could impair the grinding operation.
  • the shower supply water is seen to enter from the left along a feed pipe 184, through a rotary seal 186 and into a central passageway 189 located axially of the low speed drive shaft 117.
  • a plurality (in this case 4) of radial passageways 191 extend outwardly from and communicate with the passageway 189, the passageways 191 being defined by appropriate pipes or other conduits.
  • the latter communicate with respective shower pipes 193 which extend axially with respect to the rotor 120, and which are braced between the plates 122 and 123.
  • each of the removable shower pipes 193 is capped at the rightward end with a pipe cap 195, and has a plurality of nozzle openings 196 adjacent the internal grinding surface 90.
  • rotation of the rotor 120 increases the pressure in the removable shower pipes 193, with respect to the pressure in the passageway 189, permitting the supply water entering along the pipe 184 to be less than the intended pressure in the removable shower pipe 193.
  • the grinder structure herein disclosed has several advantages, and these are summarized below.
  • the grinding assembly herein disclosed can be used to create pressurized effects but without the need for pressure lock mechanisms.
  • the grinder of the present invention rotates more slowly than a refiner.
  • the grinder of the present invention may rotate in the area of 500 rpm, as compared to 1800 rpm for a disk refiner. Thus less power is absorbed than in a refiner (in this specific area), and the chip reaches the working surface of the grinder in better condition due to the lower speed.
  • the grinding pressure can be controlled accurately by providing means for varying the rotor speed, since this will govern the centrifugal force generated.
  • a further option would be to utilize a grinding stone surface which is other than cylindrical, for example a conical surface having a profile as shown by the broken line 197 in Figure 1. This could be used to aid both stock evacuation and rotor-to-stone clearance adjustment. Such an option may well apply to the chip grinding process in particular, where the clearance between the stone and the rotor is more critical, and the variation in peripheral speed due to the varying diameter is of lesser importance.
  • the stone design for the present construction consists of vitrified sections set into the steel rim or frame 94. This will permit the provision of a stone having less weight and complexity than traditional structures. A further option is the eventual design of the stone housing so that it forms a jacket for cooling purposes.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
  • Paper (AREA)
  • Crushing And Grinding (AREA)

Claims (17)

1. Zentrifugalmahlwerk mit einer inneren Mahlfläche (22, 90,181) in der Form einer Rotationsfläche und einem zur Rotation koaxial mit der Mahlfläche angeordneten Rotor (28, 30; 120), der einen Mittelhohlraum (64) aufweist und mindestens zwei Behälter begrenzt, durch die Material im Mittelhohlraum mit der Mahlfläche in Kontakt treten kann und die um den Rotor herum angeordnet sind, dadurch gekennzeichnet, daß der Rotor (28, 30; 120) mit einer Vorrichtung zum Beaufschlagen der Mahlfläche (22, 90, 181) mit Wasser versehen ist, die eine erste, an die Rotorachse angrenzende Wasserbahn (189) im Rotor, für jeden Behälter eine zweite, an die Mahlfläche angrenzende und in der Rotationsrichtung dem jeweiligen Behälterfolgende Wasserbahn (183) im Rotor, eine die erste Bahn (189) jeweils mit der zweiten Bahn (193) verbindende Wassertransporteinrichtung (191) und eine Düseneinrichtung (67, 196) umfaßt, die zum Bespritzen der Mahlfläche mit Wasser mit jeder zweiten, von der Rotorachse weiter als die erste Bahn (189) entfernten Bahn (193) verbunden ist, wobei durch die Rotation des Rotors der Wasserdruck in der Düsseneinrichtung (67, 196) infolge der Zentrifugalwirkung gegenüber der ersten Bahn erhöht wird.
2. Zentrifugalmahlwerk nach Anspruch 1, dadurch gekennzeichnet, daß die Rotationsfläche (197) sich in einer Richtung entlang ihrer Achse verjüngt.
3. Zentrifugalmahlwerk nach Anspruch 2, dadurch gekennzeichnet, daß die Mahlfläche (197) eine kegelartige Form aufweist.
4. Zentrifugalmahlwerk nach Anspruch 1, dadurch gekennzeichnet, daß die Mahlfläche (22, 90, 181) im wesentlichen eine zylinderartige Form aufweist.
5. Zentrifugalmahlwerk nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Achse der Mahlfläche (22, 90, 181) im wesentlichen waagerecht verläuft.
6. Zentrifugalmahlwerk nach Anspruch 1, dadurch gekennzeichnet, daß zwei von Zwischenbereichen getrennte und eine größere Umfangsweite als jeder Behälter aufweisende Behälter antipodisch am Rotor (28, 30; 120) angeordnet sind.
7. Zentrifugalmahlwerk nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die erste Wasserbahn (189) koaxial zum Rotor verläuft.
8. Zentrifugalmahlwerk nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß jede Düseneinrichtung (67, 196) mehrere Düsen zum Bespritzen der Mahlfläche (22,90,181) mit Wasser enthält.
9. Zentrifugalmahlwerk nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß eine erste, im wesentlichen parallel zur Rotorachse verlaufende Fingerstange (40, 145) am Rotor in Rotationsrichtung hinter jedem Behälter und vor der entsprechenden zweiten Wasserbahn (193) und eine zweite, fischgrätenförmige, mit der Spitze nach oben weisende Fingerstange (175) am Rotor hinter jeder ersten Fingerstange angeordnet ist, wobei die zweite Fingerstange (175) bei Betrieb Material an die Axialenden der Mahlfläche drängt.
10. Zentrifugalmahlwerk nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß ein eine Materialräumkammer begrenzendes Gehäuse (96) im Bereich beider Enden der Mahlfläche vorgesehen ist, wobei ein Materialauslaß (162) mit den Materialräumkammern verbunden ist.
11. Verfahren zum Mahlen von Holzmaterial an einer inneren Mahlfläche (20,90,181) in der Form einer Rotationsfläche, bei dem das Material in mehreren getrennten und umfangsmäßig geteilten Behältern in Umlauf um die innere Mahlfläche (20, 90, 181) gebracht wird, um zwischen dem Material und der Fläche eine Zentrifugalkraft zu erzeugen, dadurch gekennzeichnet, daß die Mahlfläche aus der Düseneinrichtung (67, 196), die sich in Rotationsrichtung hinter jeden Behälter anschließt und mit ihm zur Entfernung von Holzfasern rotiert, mit Wasser bespritzt wobei durch die Zentrifugalwirkung der Wasserdruck im Bereich der Düseneinrichtung (67, 196) erhöht wird.
12. Verfahren nach Anspruch 11, dadurch gekennzeichnet, daß die Mahlfläche (22, 90, 181) von einer zwischen jedem Behälter und der entsprechenden Düseneinrichtung (67, 196) angeordneten Fingerstange (40, 145) gesäubert wird.
13. Verfahren nach Anspruch 12, dadurch gekennzeichnet, daß Mahlfläche (22, 90, 181) von einer sich der Düseneinrichtung (67, 196) anschließenden, fischgratenförmigen Fingerstange (175) gesäubert wird, um den Brei zu den Axialenden der Mahlfläche zu bewegen.
14. Verfahren nach einem der vorhergehenden Ansprüche 11 bis 13, dadurch gekennzeichnet, daß die Mahlfläche (22, 90, 181) sich in einer Mahlkammer befindet und das Material von einem koaxial zu der Mahlfläche (22, 90, 181) angeordneten Rotor (30, 120) in Umlauf gebracht wird, wobei das Wasser axial in den Rotor gelangt und von der Rotorachse weg zu der Düseneinrichtung (67, 196) bewegt wird.
15. Verfahren nach einem der vorhergehenden Ansprüche 11 bis 14, dadurch gekennzeichnet, daß es sich bei dem Material um Papierholz handelt.
16. Verfahren nach einem der vorhergehenden Ansprüche 11 bis 15, dadurch gekennzeichnet, daß das Material einer die Mahlfläche enthaltenden Kammer axial zugeführt wird.
17. Verfahren nach einem der vorhergehenden Ansprüche 11 bis 16, dadurch gekennzeichnet, daß zusammen mit dem Material auch das Wasser um die Mahlfläche (22,90,181) herum geführt und durch die Zentrifugalkraft unter Druck gesetzt wird, so daß der Siedepunkt des Wassers angehoben wird und der Mahlvorgang demnach bei einer Temperatur stattfinden kann, die über dem Siedepunkt des Wassers bei Luftdruck liegt, ohne daß das Wasser an der Mahlfläche (22, 90, 181) verdampft.
EP82306519A 1981-12-07 1982-12-07 Verfahren und Vorrichtung zur Mahlen von Pulpholz und Holzspanen durch Fliehkraft Expired EP0081380B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB8136864 1981-12-07
GB8136864 1981-12-07
US383713 1982-06-01
US06/383,713 US4474335A (en) 1981-12-07 1982-06-01 Apparatus for centrifugal pulpwood and wood chip grinding

Publications (3)

Publication Number Publication Date
EP0081380A2 EP0081380A2 (de) 1983-06-15
EP0081380A3 EP0081380A3 (en) 1984-10-03
EP0081380B1 true EP0081380B1 (de) 1987-03-04

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EP82306519A Expired EP0081380B1 (de) 1981-12-07 1982-12-07 Verfahren und Vorrichtung zur Mahlen von Pulpholz und Holzspanen durch Fliehkraft

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EP (1) EP0081380B1 (de)
DE (1) DE3275568D1 (de)
FI (1) FI69138C (de)
NO (1) NO157829C (de)

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT118812B (de) * 1928-10-29 1930-08-25 Andreas Biffar Verfahren und Vorrichtung zum Schleifen von Holz.

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DE3275568D1 (en) 1987-04-09
EP0081380A2 (de) 1983-06-15
FI824157L (fi) 1983-06-08
FI69138B (fi) 1985-08-30
NO157829B (no) 1988-02-15
FI824157A0 (fi) 1982-12-02
FI69138C (fi) 1985-12-10
NO824045L (no) 1983-06-08
NO157829C (no) 1988-06-08
EP0081380A3 (en) 1984-10-03

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