EP0173271B1 - Broyeur à billes à passage annulaire - Google Patents

Broyeur à billes à passage annulaire Download PDF

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Publication number
EP0173271B1
EP0173271B1 EP85110652A EP85110652A EP0173271B1 EP 0173271 B1 EP0173271 B1 EP 0173271B1 EP 85110652 A EP85110652 A EP 85110652A EP 85110652 A EP85110652 A EP 85110652A EP 0173271 B1 EP0173271 B1 EP 0173271B1
Authority
EP
European Patent Office
Prior art keywords
grinding
gap
ball mill
annular
type ball
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP85110652A
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German (de)
English (en)
Other versions
EP0173271A2 (fr
EP0173271A3 (en
Inventor
Peter Fabian
Karl-Heinz Hoffmann
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.)
Cessione erich Netzsch & Co Holding KG GmbH
Original Assignee
Reimbold und Strick GmbH and Co
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.)
Filing date
Publication date
Application filed by Reimbold und Strick GmbH and Co filed Critical Reimbold und Strick GmbH and Co
Priority to AT85110652T priority Critical patent/ATE39066T1/de
Publication of EP0173271A2 publication Critical patent/EP0173271A2/fr
Publication of EP0173271A3 publication Critical patent/EP0173271A3/de
Application granted granted Critical
Publication of EP0173271B1 publication Critical patent/EP0173271B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/16—Mills in which a fixed container houses stirring means tumbling the charge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/16—Mills in which a fixed container houses stirring means tumbling the charge
    • B02C17/166—Mills in which a fixed container houses stirring means tumbling the charge of the annular gap type

Definitions

  • the invention relates to an annular gap ball mill for continuous fine grinding, in particular of mineral hard materials, with a standing grinding container closed by a lid, in which a rotor is arranged, the conical outer surface of which, with the conical inner surface of the grinding container, delimits a grinding gap which is connected to a feed opening and which contains grinding beads, the rotor having an upper part, the shape of which is matched to the inner surface of the cover and in the region of which an outlet opening is arranged.
  • Mineral hard materials such as corundum, zirconium dioxide, aluminum oxide, silicon carbide and similar substances, have so far been mainly crushed in ball mills with iron balls. This requires considerable dwell times of the material in the grinding chamber, and all parts that come into contact with the material to be ground and the iron balls are subject to very heavy wear. In addition, the grinding process is associated with annoying noise. Another disadvantage of such ball mills is that the abrasion of the iron balls gets into the regrind and has to be washed out in chemical washing processes in a complicated and expensive manner.
  • Annular gap ball mills of the type mentioned at the beginning (DE-OS 2848479) are said to be an improvement over the conventional ball mills, but are not very suitable for the fine grinding of mineral hard materials and only for the grinding of very much softer materials, e.g. Chalk and the like, economically. This is primarily due to the behavior of the grinding balls or grinding beads in the grinding gap.
  • the grinding beads which are pumped into the grinding gap through the feed opening from below or through a hollow shaft of the rotor from above, initially move through the pressure of the feed pump, with which the grinding material suspension is pressed into the annular gap ball mill, and through the rotational movement of the Rotors upwards in the grinding gap, but sink when the pump pressure decreases due to gravity and do not allow a grinding process to take place in the upper part of the grinding gap. If you want to prevent this, the feed pump pressure or the regrind flow must be increased in such a way that the grinding beads are also held in the upper part of the grinding gap; then there is the danger that the grinding beads are discharged together with the regrind, which in turn reduces the grinding performance.
  • the vane pump wheel only reinforces another disadvantage of this annular gap ball mill, which is that grinding beads that do not sag down are increasingly pumped to the outlet opening with the material to be ground and are therefore also lost to the grinding process.
  • the vane pump wheel is subject to heavy wear from grinding beads and regrind. Sieves are sometimes used to hold back the grinding beads in the grinding gap, but these can hinder and even prevent the regrind discharge if they are clogged with regrind and grinding beads.
  • a comparatively high collecting space above the rotor should ensure a uniform flow of regrind through the grinding chamber, which is limited by the convexly curved end face of the upper part of the rotor and the correspondingly convexly curved inner surface of the cover of the grinding container and with which the outlet opening is directly connected. This collection room cannot make any contribution to the retention of the grinding beads in the grinding gap.
  • annular gap ball mill (DE-OS-2811 899) has a regrind container, the inner surface of which delimits a grinding chamber into which a conical driver body is immersed, the inner surface of the regrind container and the displacement body being designed as an annular double cone.
  • the surfaces delimiting the grinding chamber can be roughened or raised or depressed, such as Ribs, grooves, pins and the like, provided, but this would lead to unacceptable wear especially when grinding hard materials.
  • the annular gap ball mill itself nor this special design are therefore suitable for the fine comminution of mineral hard materials.
  • the invention is based on the object of improving an annular gap ball mill of the type mentioned at the outset in such a way that, by increasing the performance of the grinding beads in the grinding gap, it is also possible to economically and technically optimally fine comminute mineral hard materials.
  • This object is achieved in that the upper part of the rotor and the cover are conical and delimit an annular outlet gap, the lower end of the largest diameter opening into an annular chamber at the open upper end of the largest diameter of the grinding gap.
  • any mineral hard material such as corundum, zirconium dioxide, aluminum oxide, silicon carbide and the like, can be finely ground economically, because the entire height of the grinding gap is used for the active grinding process of the grinding beads. This is due to the fact that hydrodynamics and centrifugal force, as a result of the conical design of the rotor and its upper part, generate a suction force which counteracts the gravity of the grinding beads and prevents them from sinking into the grinding gap.
  • the grinding gap is used 100% for the grinding process because it is penetrated by grinding pearls in its entire height and width even with a slowly rotating rotor and because discharge of grinding pearls with the ground material through the outlet opening and thus a reduction in the quantity of grinding pearls or the grinding effect is effectively prevented.
  • the latter is due to the fact that a predetermined excess of grinding pearls is located in the radial annular chamber at the upper end of the grinding gap, i.e. in the area of the largest rotor diameter, collects and forms a floating barrier layer there, which retains the active grinding beads in the grinding gap without preventing the finely ground material from escaping from the grinding gap in the direction of the outlet opening in the manner of a sieve or the like.
  • the regrind moved upwards to the outlet opening after the annular chamber through the narrow outlet gap between the upper rotor part and the lid contains practically no milling beads, so that a subsequent separation of milling beads and milling material is not necessary. Even if the width of the outlet gap is larger than the millbead diameter, the millbeads are not conveyed upward through the outlet gap because they are retained in the radial annular chamber by gravity or centrifugal force.
  • the annular gap ball mill according to the invention results in longer dwell times because lower circumferential speeds of the rotor and lower feed pump output can be used.
  • the millbase between the millbeads moves upwards very slowly, and the grain size of the millbase is narrow.
  • the annular gap ball mill according to the invention works extremely well with grinding beads of various sizes, the coarse, heavier grinding beads preferably grinding coarse parts of the ground material in the grinding gap below and the fine, lighter grinding pearls preferably grinding finer parts in the grinding gap above, because the centrifugal force and thus the buoyancy of the lighter particles increases upwards. If the material now remains in the grinding gap for a sufficiently long time, the hard material is ground in a short time into powder of the desired fineness and discharged in a continuous stream. Corresponding to the higher filling in the grinding gap, the utilization of the energy supplied to the rotor is greater and the operation of the annular gap ball mill is more economical.
  • the upper part and the inner surface of the cover have the shape of a truncated cone.
  • the grinding gap and the discharge gap are each formed with a parallel surface and that the grinding gap is wider than the discharge gap.
  • Further configurations of the grinding gap and the run-up gap can, however, be expedient for adaptation to the mineral hard material to be ground.
  • the grinding gap can widen upwards, while the outlet gap has a parallel surface. It is also possible that the grinding gap and the discharge gap each widen upwards. Furthermore, the grinding gap can widen upwards, while the outlet gap narrows upwards. In all cases there is an annular chamber which, in conjunction with the counter-rotating cone of the upper rotor part, picks up the barrier layer of grinding beads and prevents active grinding beads from being discharged from the grinding gap.
  • the annular chamber is advantageously located in the region of the dividing joint of the grinding container and the lid, so that after removing the lid, the grinding beads can be removed from the open half of the chamber.
  • the annular chamber is equipped with at least one opening for the inlet of grinding beads, so that these are separately added to the ground material introduced into the grinding gap from above. This helps prevent the grinding beads from sagging to the bottom of the grinding container.
  • the annular chamber has essentially parallel walls and on its circumferential end face che is rounded convex.
  • This shape of the chamber offers an adaptation to the spherical shape of the grinding beads in such a way that their abrasion is minimized.
  • the ratio of the height of the upper part to the total height of the rotor and upper part is 0.2 to 0.5: 1. So the top is shorter than the rotor.
  • the conical outer surface of the rotor expediently runs at an angle of 40 ° to 85 °, preferably 60 ° to 80 °, in particular 70 ° to 80 ° to the vertical.
  • the cone inclination of the rotor is adapted to the type of hard material to be shredded, and the cone inclination of the upper part results from the ratio of its height to the total height.
  • the inner surface of the grinding container and the lid as well as the outer surface of the rotor and its upper part have fine-rough surfaces. This means that under no circumstances should they be particularly smooth, nor should they be particularly rough.
  • the fine roughness can be achieved by a suitable coating of the surfaces, for example with polyurethane, which serves as a corrosion and wear protection layer.
  • the inside of the rotor can be ventilated.
  • the grinding container and the lid can be surrounded by a cooling liquid jacket. Exemplary embodiments of the invention are shown schematically in the drawing. 1 shows a longitudinal section of an annular gap ball mill, FIGS. 2, 3 and 4 longitudinal sections of an annular gap ball mill with different designs of the grinding gap and the outlet gap.
  • an annular gap ball mill 1 is suspended via an arm 11, which essentially consists of a stationary truncated cone-shaped grinding container 12 and a truncated cone-shaped rotor 13, which at its wide upper end is flush with the wide lower end of a truncated cone-shaped upper part 14 is whose height is less than the height of the rotor 13.
  • the upper part 14 is covered at a short distance from a lid 15 which is releasably attached to the grinding container 12 and is adapted to the conical inclination of the upper part 14.
  • the upper end of the upper part 14 engages with a vertical shaft 16, which bores the rotor 13 and upper part 14 in the grinding container 12 and transfers the drive of a motor 17 to the upper part 14 and rotor 13.
  • the entire inner surface of the grinding container 12 and the lid 15 is provided with a wear and corrosion-resistant lining 18, 19 which has a fine-rough surface and e.g. can consist of polyurethane.
  • the outer surface of the rotor 13 and its upper part 14 is equipped with a correspondingly fine-rough surface, which is not shown for the sake of clarity.
  • a parallel-walled annular grinding gap 20 is provided, which is connected via a horizontal space 22 between the flat bottoms of the grinding container 12 and the rotor 13 to a lower central feed opening 21 for the ground material.
  • an outlet gap 23 with a parallel surface, the width of which is smaller than the width of the grinding gap 20 and which extends over the entire height of the upper part 14.
  • the lower end of the downwardly diverging outlet gap 23 and the upper end of the upwardly diverging grinding gap 20 open into an annular chamber 24 which is essentially worked out in the linings 18 and 19.
  • top and bottom walls are flat and parallel to each other; its outer end face 25 is convexly curved. Since the chamber 24 lies on the dividing joint between the cover 15 and the grinding container 12, it can be opened by removing the cover 15.
  • a spacer 27 is inserted into the division joint 26, which can be exchanged for a spacer of a different thickness in order to raise or lower the grinding container 12 more or less with respect to the rotor 13 in order to change the width of the grinding gap 20.
  • the chamber 24 is accessible through an opening 28 in the cover flange. Through this opening 28 grinding beads are introduced into the grinding gap 20 when the rotor 13 rotates with the upper part 14 and mineral hard materials to be comminuted through the feed opening 21 have been introduced into the grinding gap 20 from below.
  • the shaft 16 passes through a discharge chamber 29 in a nozzle 30 which is flanged to the cover 15.
  • a nozzle 30 which is flanged to the cover 15.
  • In the wall of the nozzle 30 there is an outlet opening 31 for the finely ground material, which is pressed out of the outlet gap 23 into the discharge chamber 29.
  • baffles 32, 33 are arranged, which form ventilation slots.
  • the grinding container 12 is enclosed by a housing 34 which has a cooling water inlet 35 and a cooling water outlet 36.
  • the cover 15 is also surrounded by a housing 37 which is provided with a cooling water inlet 38 and a cooling water outlet 39.
  • the motor 17 When operating the annular gap ball mill 1, the motor 17 first rotates the rotor 13 with the upper part 14, then grinding material (slip) is introduced into the grinding gap 20 through the feed opening 21, and then 28 grinding beads are added through the opening, which result from the same material as the material to be shredded, so that the abrasion of the grinding beads does not contaminate the material to be ground and high-purity substances are generated. Since the conical design of the rotor 13 and its upper part 14 at the upper end of the grinding gap 20 achieves the highest circumferential speed, this results in an upward suction effect which prevents the grinding beads from falling in the grinding gap 20. An excess of grinding beads is collected in the chamber 24, so that a floating barrier layer is formed, which prevents grinding beads from escaping from the grinding gap 20.
  • the be in the grinding gap 20 sensitive grinding beads fill the grinding gap 20 over its entire height, so that it is 100% used for the grinding process and the ground material is exposed to a maximum grinding attack during its residence time in the grinding gap 20.
  • Grinding beads which have become so small due to abrasion, for example, that they fit into the outlet gap 23, are returned to the chamber 24 by the centrifugal force, so that the powder emerging from the outlet opening 31 contains no grinding beads and without aftertreatment such as washing or sieving in it desired final state is present. Since the grinding beads are reliably prevented from sedimentation in the grinding gap, the risk of starting difficulties or blocking of the rotor is averted. The wear of the parts is correspondingly low.
  • the degree of comminution can be influenced by the size of the grinding beads, which can be different if necessary, whereby a gradual comminution is achieved because coarse grinding beads in the lower part of the annular gap ball mill preferably grind the coarse parts and finer grinding beads in the upper part preferably comminute the finer parts .
  • annular gap ball mills 2, 3, 4 should essentially correspond to the construction according to FIG. 1. Only possible modifications of the cross sections of grinding gap and outlet gap are shown in the diagram, which can be advantageous depending on the type of mineral hard material to be comminuted.
  • annular radial chamber 24 which receives the grinding-pearl barrier layer and is located at the transition between grinding gap 20a, 20b, 20c to outlet gap 23a, 23b, 23c. This transition is essentially identical to the equator line between rotor 13a, 13b, 13c and upper part 14a, 14b, 14c.
  • the grinding gap 20a widens upwards, while the outlet gap 23a has a parallel surface.
  • the grinding gap 20b is wider at the top than at the bottom, and the outlet gap 23b also widens upwards.
  • FIG. 4 shows a further possible embodiment, according to which the grinding gap 20c widens upwards like the grinding gaps 20a and 20b, but the outlet gap 23c narrows upwards and opens into the chamber 24 with a wider lower end.
  • the angle of the bevel of the rotor 13, 13a, 13b, 13c to the vertical is advantageously 70 ° to 80 °. The best grinding results are achieved with this inclination.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Disintegrating Or Milling (AREA)
  • Milling Processes (AREA)
  • Hydrogenated Pyridines (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Heat Treatment Of Articles (AREA)

Claims (14)

1. Broyeur à billes à passage annulaire (1) pour le broyage fin continu, en particulier de substances minérales dures, comportant un conteneur de broyage (12) vertical, fermé par un couvercle (15) et dans lequel est disposé un rotor (13) dont la surface extérieure conique limite, avec la surface intérieure conique du conteneur de broyage (12), un passage de broyage (20) qui est relié à une ouverture d'alimentation (21) et qui contient des perles de broyage étant précisé que le rotor (13) présente une partie supérieure (14) dont la forme est adaptée à la surface intérieure du couvercle (15) et dans la zone de laquelle est disposée une ouverture de sortie (31), caractérisé en ce que la partie supérieure (14,14a,14b,14c) du rotor (13,13a,13b,13c) et le couvercle (15) sont de forme conique et limitent un passage d'évacuation annulaire (23, 23a, 23b, 23c) dont l'extrémité inférieure, du diamètre le plus grand, débouche dans une chambre annulaire (24) située à l'extrémité supérieure ouverte, du diamètre le plus grand, du passage de broyage (20, 20a, 20b, 20c).
2. Broyeur à billes à passage annulaire selon la revendication 1, caractériosé en ce que la partie supérieure (14,14a,14b,14c) et la surface intérieure du couvercle (15) présentent la forme d'un tronc de cône.
3. Broyeur à billes à passage annulaire selon la revendication 1 ou 2, caractérisé en ce que le passage de broyage (20) et le passage d'évacuation (23) sont respectivement conçus à surface parallèle et en ce que le passage de broyage (20) est plus large que le passage d'évacuation (23).
4. Broyeur à billes à passage annulaire selon la revendication 1 ou 2, caractérisé en ce que le passage de broyage (20a) s'élargit vers le haut et en ce que le passage d'évacuation (23a) est à surfaces parallèles.
5. Broyeur à billes à passage annulaire selon la revendication 1 ou 2, caractérisé en ce que le passage de broyage (20b) et le passage d'évacuation (23b) s'élargissent chacun vers le haut.
6. Broyeur à billes à passage annulaire selon la revendication 1 ou 2, caractérisé en ce que le passage de broyage (20c) s'élargit vers le haut et en ce que le passage d'évacuation (23c) va en se rétrécissant vers le haut.
7. Broyeur à billes à passage annulaire selon l'une des revendications 1 à 6, caractérisé en ce que la chambre annulaire (24) se trouve dans la zone du joint de séparation (26) du conteneur de broyage (12) et du couvercle (15).
8. Broyeur à billes à passage annulaire selon l'une des revendications 1 à 7, caractérisé en ce que la chambre annulaire (24) présente au moins une ouverture (28) pour l'introduction des perles de broyage.
9. Broyeur à billes à passage annulaire selon . l'une des revendications 1 à 8, caractérisé en ce que la chambre annulaire (24) a ses parois sensiblement parallèles et présente une forme arrondie convexe à sa surface frontale périphérique (25).
10. Broyeur à billes à passage annulaire selon l'une des revendications 1 à 9, caractérisé en ce que le rapport entre la hauteur de la partie supérieure (14,14a,14b,14c) et la hauteur totale du rotor (13,13a,13b,13c) et de la partie supérieure (14,14a,14b,14c) va de 0,2 à 0,5:1.
11. Broyeur à billes à passage annulaire selon l'une des revendications 1 à 10, caractérisé en ce que la surface extérieure conique du rotor (13,13a,13b,13c) fait, par rapport à la verticale, un angle de 40° à 85°, de préférence 60° à 80°, en particulier 70° à 80°.
12. Broyeur à billes à passage annulaire selon l'une des revendications 1 à 11, caractérisé en ce que la surface intérieure du contenuer de broyage (12) et de couvercle (15) ainsi que la surface extérieure du rotor (13,13a,13b,13c) et de sa partie supérieure (14,14a,14b,14c) présentent des surfaces à fine rugosité.
13. Broyeur à billes à passage annulaire selon l'une des revendications 1 à 12, caractérisé en ce que le passage d'évacuation (23) débouche, à son extrémité supérieure, dans une chambre d'évacuation (29) à laquelle est raccordée l'ouverture de sortie (31).
14. Broyeur à billes à passage annulaire selon l'une des revendications 1 à 13, caractérisé en ce que le conteneur de broyage (12) et le couvercle (15) sont entourés par une enveloppe de liquide de refroidissement.
EP85110652A 1984-08-29 1985-08-24 Broyeur à billes à passage annulaire Expired EP0173271B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85110652T ATE39066T1 (de) 1984-08-29 1985-08-24 Ringspalt-kugelmuehle.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3431636A DE3431636C1 (de) 1984-08-29 1984-08-29 Ringspalt-Kugelmuehle
DE3431636 1984-08-29

Publications (3)

Publication Number Publication Date
EP0173271A2 EP0173271A2 (fr) 1986-03-05
EP0173271A3 EP0173271A3 (en) 1986-08-20
EP0173271B1 true EP0173271B1 (fr) 1988-12-07

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP85110652A Expired EP0173271B1 (fr) 1984-08-29 1985-08-24 Broyeur à billes à passage annulaire

Country Status (14)

Country Link
US (2) US4703896A (fr)
EP (1) EP0173271B1 (fr)
JP (1) JPS6168145A (fr)
KR (1) KR900000548B1 (fr)
AT (1) ATE39066T1 (fr)
AU (1) AU555884B2 (fr)
BR (1) BR8504117A (fr)
CA (1) CA1244392A (fr)
DD (1) DD236462A5 (fr)
DE (2) DE3431636C1 (fr)
ES (1) ES8700577A1 (fr)
FI (1) FI74631C (fr)
IN (1) IN165878B (fr)
ZA (1) ZA856616B (fr)

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GB0516549D0 (en) * 2005-08-12 2005-09-21 Sulaiman Brian Milling system
WO2013079189A1 (fr) * 2011-11-29 2013-06-06 Haver & Boecker Ohg Dispositif et procédé de traitement de matériaux
GB201213777D0 (en) * 2012-07-31 2012-09-12 Internat Innovative Technologies Ltd Mill apparatus with underslung mill units
US9943853B2 (en) * 2014-01-16 2018-04-17 Michael Marshall Pulverizing apparatus and method of pulverizing rocks
CN104971799A (zh) * 2014-04-03 2015-10-14 无锡赫达科技有限公司 一种环隙式纳米砂磨机
US10086379B2 (en) * 2015-02-27 2018-10-02 Aaron Engineered Process Equipment, Inc. Rotary mill
CN107350062A (zh) * 2017-08-21 2017-11-17 天津水泥工业设计研究院有限公司 一种采用非金属研磨介质的选粉机外置式立磨联合粉磨系统
CN107597304B (zh) * 2017-10-30 2019-04-02 中国地质大学（武汉） 一种弹簧压盖式装料球磨机装置
CN112121963B (zh) * 2020-09-19 2022-01-11 江苏东方硕华光学材料有限公司 一种有机膨润土制备工艺
CN114247628A (zh) * 2021-11-19 2022-03-29 山东润德生物科技有限公司 一种氨基葡萄糖及其盐类颗粒的筛分装置
CN114054164B (zh) * 2021-11-26 2023-03-21 昆明理工大学 一种立式高转速球磨机

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DE3022809A1 (de) * 1980-06-19 1982-01-07 Fryma-Maschinen AG, 4310 Rheinfelden Kugelmuehle
JPS5811475A (ja) * 1981-07-13 1983-01-22 株式会社日立製作所 油圧エレベ−タの速度制御装置
DE3245825C2 (de) * 1982-12-10 1994-01-27 Buehler Ag Geb Rührwerksmühle

Also Published As

Publication number Publication date
EP0173271A2 (fr) 1986-03-05
DE3566619D1 (en) 1989-01-12
US4776522A (en) 1988-10-11
FI853276L (fi) 1986-03-01
DE3431636C1 (de) 1985-10-17
FI74631C (fi) 1988-03-10
IN165878B (fr) 1990-02-03
FI853276A0 (fi) 1985-08-27
AU4667885A (en) 1986-04-10
ZA856616B (en) 1986-05-28
KR860001614A (ko) 1986-03-20
EP0173271A3 (en) 1986-08-20
FI74631B (fi) 1987-11-30
JPS6168145A (ja) 1986-04-08
BR8504117A (pt) 1986-04-22
KR900000548B1 (ko) 1990-01-31
ES546469A0 (es) 1986-10-16
US4703896A (en) 1987-11-03
ES8700577A1 (es) 1986-10-16
DD236462A5 (de) 1986-06-11
CA1244392A (fr) 1988-11-08
JPH0152062B2 (fr) 1989-11-07
ATE39066T1 (de) 1988-12-15
AU555884B2 (en) 1986-10-16

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