EP0142698B1 - Procédé et dispositif pour le déchargement pneumatique de centrifuges - Google Patents

Procédé et dispositif pour le déchargement pneumatique de centrifuges Download PDF

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Publication number
EP0142698B1
EP0142698B1 EP84112276A EP84112276A EP0142698B1 EP 0142698 B1 EP0142698 B1 EP 0142698B1 EP 84112276 A EP84112276 A EP 84112276A EP 84112276 A EP84112276 A EP 84112276A EP 0142698 B1 EP0142698 B1 EP 0142698B1
Authority
EP
European Patent Office
Prior art keywords
pipe
discharge pipe
discharge
centrifuge
drying gas
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
EP84112276A
Other languages
German (de)
English (en)
Other versions
EP0142698A2 (fr
EP0142698A3 (en
Inventor
Hans-Joachim Titus
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.)
Mannesmann Demag Krauss Maffei GmbH
Original Assignee
Krauss Maffei AG
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 Krauss Maffei AG filed Critical Krauss Maffei AG
Priority to AT84112276T priority Critical patent/ATE29224T1/de
Publication of EP0142698A2 publication Critical patent/EP0142698A2/fr
Publication of EP0142698A3 publication Critical patent/EP0142698A3/de
Application granted granted Critical
Publication of EP0142698B1 publication Critical patent/EP0142698B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B11/00—Feeding, charging, or discharging bowls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B15/00—Other accessories for centrifuges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B5/00—Other centrifuges
    • B04B5/10—Centrifuges combined with other apparatus, e.g. electrostatic separators; Sets or systems of several centrifuges

Definitions

  • the invention relates to a method for emptying centrifuges, in particular vertical centrifuges, in which the centrifuged product is released into a discharge pipe through the closed centrifuge housing by peeling off the wall of the rotating centrifugal drum and in the heated drying gas in a primary stream into the centrifuge and into a secondary stream is passed into a drying section connected to the discharge pipe and carrying the product-gas mixture.
  • the gas-tight centrifuge housing of a centrifuge to be emptied is included in a closed conveyor circuit by passing heated drying gas into the centrifuge by means of a pressure line and a discharge tube provided with a peeling head to one Suction line connects, in order to then feed the product conveyed out of the centrifuge by means of a gas circulation device through a drying section to a cyclone filter bunker.
  • the sensitive or poisonous product which may or may not be sterile, is peeled out of the centrifugal drum and conveyed further within a closed circuit without this solvent becoming volatile solvent coming into contact with the ambient air.
  • this method it is proposed to connect the outlet of the heating device arranged in the closed conveyor circuit for reheating the drying gas cooled in the condenser directly to the suction line via a shunt line, so that the centrifuge is partially bypassed.
  • This type of gas routing should be used with relatively wet centrifugal products that tend to stick to start drying during the peeling and discharge process.
  • the invention is based on the object of further developing and improving the above-mentioned method for emptying centrifuges in such a way that baking of the product to be conveyed within the discharge pipe or in the subsequent transport line is avoided to a large extent and, furthermore, by reducing the outlay on equipment Shortening the necessary drying tube length is made possible.
  • drying gas carried in the secondary stream is transferred before being combined with the product-gas mixture conveyed through the discharge pipe into a turbulent longitudinal flow which essentially envelops the discharge pipe up to its downstream end.
  • the amount of drying gas introduced in the secondary flow which concentrically surrounds the product-gas mixture as it emerges from the discharge pipe, ensures intensive swirling, so that the greatest possible exchange takes place between the hot drying gas and the product moisture.
  • This process can roughly be compared to the principle of atomization drying, which also considerably shortens the length of the tube that is otherwise required for drying the current. Since the secondary flow is brought concentrically to the discharge pipe before the combination with the product-gas mixture, there is the advantageous possibility of maintaining a higher temperature in the secondary flow, this heat either before the combination with the product-gas mixture Discharge tube is released and therein the drying process promotes or can be largely introduced into the mixture when a z. B.
  • the drying tube length is also advantageously shortened in order to dryly separate the product discharged from the centrifuge in the downstream cyclone bunker filter.
  • the invention also relates to a pneumatic discharge device, in particular for a vertical centrifuge, for carrying out the above-described method according to the invention.
  • the state of the art for this is a discharge device according to DE-A-20 56 893 already mentioned at the outset with a discharge tube which can be moved in a centrifuge centrifuge drum and has a peeling head at the preceding end, a centrifuge housing which is involved in a pneumatic conveying circuit and a connection housing arranged thereon in a sealed manner , in which the discharge pipe is guided and radial and axial adjusting devices for the discharge pipe are arranged, the pneumatic conveying circuit having a branch line for supplying a primary flow of a heated drying gas into the centrifuge and a branch line for supplying a secondary flow of the heated drying gas into one with the discharge pipe in Related drying line includes.
  • the pneumatic discharge device that the discharge pipe at its downstream end passes through the free end of the connection housing and seals protrudes from this by at least one length corresponding to its axial setting stroke, which is surrounded by a jacket tube connected to the free end of the connection housing and merging into a drying section, into which a pipe socket opens immediately behind the connection housing and which connects to the branch line of the drying gas leading to the secondary flow of the drying gas Funding group is connected.
  • connection housing Since the cladding tube for the secondary flow of drying gas is flanged directly to the rear end of the connection housing and passes downstream into the drying section, the upper or downstream end of the connection housing is sealed off from the ambient atmosphere. This fact is exploited according to the invention in order to allow the connecting pipe to pass smoothly through the entire connecting housing and in particular sealed at the downstream end through the free end of the connecting housing and to protrude into the cladding tube without interruption or telescopic extension.
  • the drying tube leading to the bunker filter would have to be inserted rigidly and statically sealed into the upper end of the connection housing and combined with a telescopically displaceable discharge tube in order to provide the necessary freedom of movement for adjusting the discharge tube and to ensure the peeling elbow connected there, ie both the longitudinal movement and the rotational movement of the discharge tube.
  • the inevitably resulting diameter widening in such an arrangement between the discharge pipe and suction line connection leads to an undesirable gas swirling at this point and to caking of the product on the pipe walls.
  • the caking movements of the discharge tube are blocked by such caking.
  • the discharge tube can be finely ground and polished on the outside and can be sealed with a seal arranged at the upper end of the connection housing.
  • This seal and the finely ground circumference of the discharge tube have the further advantage that the annular space formed with the cladding tube can be kept free with the aid of the secondary flow of the drying gas, otherwise there is a risk of product dust falling backwards as a result of an increase in diameter.
  • the drying gas subsequently introduced flows upward concentrically to the inner discharge pipe and swirls the product-gas mixture coming out of the discharge pipe for the purpose of additional intensive drying.
  • the insertion socket be connected laterally to the cladding tube directly behind the free end of the connection housing. This ensures that the secondary flow in every case keeps the lower end of the annular space in the cladding tube free of product deposits and thus also the passage and sealing of the discharge tube.
  • the inlet connection for the secondary flow of the drying gas can be connected to the casing tube essentially perpendicularly to the axis thereof, in order to ensure concentric guidance of the casing pipe even over a small axial length To achieve secondary current. If necessary for other reasons, the inlet connector can also be inclined and / or connected tangentially to the cladding tube.
  • an end plate can be held between the free end of the connection housing and a fastening flange of the cladding tube, which contains a sealing passage for the discharge tube and which defines the annular space formed between the discharge tube and the cladding tube in the axial direction up to the mouth of the insertion socket fills out.
  • the cover plate is thus used to avoid dead spaces or to place the bushing in its place.
  • the discharge pipe be surrounded within the connection housing at a concentric distance by an immersion pipe, the preceding end of which is connected to the discharge pipe and is guided in a sealed manner at least in the region of the upstream end of the connection housing.
  • the outer circumference of the immersion tube can be guided both by an adjusting ring supported between the ends of the connection housing and by a sliding ring arranged on the end of the connection housing facing the centrifuge.
  • a sealed centrifuge housing in which a centrifugal drum 12 is rotatably mounted, is supported on a centrifuge frame 14.
  • a connection housing 16 On the top of the sealed centrifuge housing 10, a connection housing 16 is fastened in a sealed manner, the details of which are explained below in connection with FIGS. 2 and 3.
  • a rotatable and height-adjustable discharge pipe 60 is guided, the lower end of which continues into a pipe bend 62 and a peeling head 64, on which peeling knives are arranged laterally and below. Due to the sensitive radial and axial adjustment of the discharge tube with the elbow, 10 very thin product layers can be removed from the centrifugal drum, which is driven at a suitable speed, for the purpose of centrifuge emptying when the centrifuge housing is closed.
  • the peeling process is accompanied by pneumatic conveying, wherein drying gas heated up via a primary flow branch 52 shown in FIG. 1 is introduced into the centrifuge housing and the discharge pipe 60 is connected to a pneumatic suction line.
  • the centrifuge is included in a pneumatic conveyor circuit which comprises successive units and assemblies.
  • the upper end of the connection housing 16 is followed by a cladding tube 18 described in more detail below, followed by a drying tube section 20 by means of an unspecified compensating piece, in which the residual moisture is extracted from the peeled product with the aid of the drying gas before it is removed via a cyclone separator 22 with a filter 24 arranged therein falls dry into a bunker 26.
  • the bunker 26 is equipped as a mixing container with a screw mixer 28.
  • the conveying circuit continues via the suction line 30, a safety filter 32 into a condenser 34, where the carrier medium is freed from the solvent vapors carried along.
  • a droplet separator 36 is connected downstream.
  • the delivery cycle continues with a high-pressure fan 38 and a measuring and metering device 40 with which the remaining solvent content of the carrier medium can be adjusted. So that the ignitability of the mixture remains low and a 0 content remains less than about 6%, an N 2 supply is provided as required. Behind the blower 38, a pressure line 42 continues into a heating device 44, which can consist of a heat exchanger. A bypass line 46 and a downstream mixing valve 48 enable sensitive temperature control of the drying gas which is now prepared for product treatment and which still flows through a safety filter 50.
  • the heated drying gas is divided into a primary flow conducted into the centrifuge via a primary branch 52 and a connection 56 on the centrifuge housing 10, and into a primary flow leading to the cladding tube 18 via a secondary branch 54 Secondary current.
  • the distribution ratio is, for example, 1: 3 instead of the distribution ratio of 1: 1 mentioned in claim 4.
  • connection housing 16 fastened on the centrifuge 10 in FIG. 2 shows its subdivision into a lower section 68, a middle section 70 and an upper section 72 for reasons of simplified production, maintenance and repair.
  • the discharge tube 60 extends through the connection housing 16, the lower end of which extends into the elbow 62, to which the peeling head 64 is fastened with an enlarged opening, from which a lateral peeling knife edge 66 can be seen.
  • the discharge tube 60 is connected to a dip tube 76 of larger diameter via a lower flange connection 74.
  • the immersion tube 76 extends essentially up to the upper inner end of the connection housing, so that a sufficient support length remains within the connection housing in the extended state.
  • the dip tube 76 is guided on its circumference in the region of the lower end of the connection housing at 78 on both sides of a seal 80 free of gas and dust.
  • a support ring 84 is clamped, on which an adjusting ring 86 is supported and rotatably supported on the circumference.
  • Support ring 84 and adjusting ring 86 include the immersion tube 76 with bearing play, so that with respect to the lower guide 80 in the connection housing there is a favorable large distance between the bearings or guides of the support tube.
  • a feather key 88 is attached to the circumference of the dip tube 76, which extends through a recess 90 of the adjusting ring 86 and serves as a driver connection between the adjusting ring and the dip tube.
  • the adjusting ring 86 is provided over a part of its circumference with a circumferential toothing 92 which is in engagement with a rack 94.
  • the rack 94 forms part of a piston rod 96 of a hydraulic cylinder 98 and is provided with pistons 100, 102 at both ends. If the cylinder 98 is acted on at one of its ends in accordance with FIG.
  • the adjusting ring 86 is rotated by the piston rod movement until the radius running through the center of the parallel key 88 is in the axis 82. In this position, the parallel key 88 is aligned with a recess 104 in the supporting ring located underneath and can now be moved downwards.
  • a drive cylinder 110 is supported in the connection housing 16 on the adjusting ring 86 in an axially parallel arrangement to the discharge tube, the piston rod of which protrudes through openings in the adjusting ring and the supporting ring and is articulated with a piston rod eye 108 on a driving lug 106 attached to the dip tube 76.
  • a proximity switch 112 and the associated sensing marks 114 on the parallel key 88 can be seen, which emits signals for the operator in the end positions of the longitudinal adjustment.
  • the discharge tube 60 is extended through an opening in the upper section 72 of the connection housing 16 into the cladding tube 18 and forms an essentially concentric annular space 118 therewith.
  • the length of extension of the discharge tube 60 upward from the connection housing 16 is determined approximately the vertical adjustment stroke corresponding to the drive cylinder 110 in order to be able to completely empty the centrifugal drum and after an additional remaining length. This ensures that the discharge pipe 60 in the extended end position is still surrounded by an annular space 18 before the secondary flow of the drying gas, which is led through the inlet pipe 120 connected to the cladding pipe 18, the product gas emerging from the upper end of the discharge pipe -Mixture can achieve.
  • the cladding tube 18 is connected with its lower flange to the connection housing 16 in a sealed manner on an end plate 116, for example made of PTFE plastic.
  • the end plate 116 extends upwards into the annular space 118 until it is approximately flush with the lower edge of the insertion piece 120.
  • the end plate thus forms an axially extended guide and seal for the ground and polished outer circumference of the discharge tube 60.
  • the upper flange 126 of the cladding tube 18 connects to the z.

Landscapes

  • Centrifugal Separators (AREA)
  • Drying Of Solid Materials (AREA)

Claims (11)

1. Procédé de vidage pour centrifugeuses, notamment centrifugeuses verticales, dans lequel le produit centrifugé après raclage de la surface du tambour rotatif (12) est alimenté à un tube d'évacuation (60) passant a travers l'envelope de centrifugeuse, et dans lequel le gaz de sechage chauffé est dirigé par un courant primaire vers la centrifugeuse et par un courant secondaire vers un chemin de séchage connecté avec ledit tube d'évacuation, caractérisé en ce que le gaz de séchage guidé dans le courant secondaire, avant son confluence avec le melange produit/gaz transporté dans le tube d'évacuation (60), est transformé dans un courant longitudinal turbulent et enrobant le tube d'évacuation dans une manière sensiblement concentrique jusqu'à son bout aval.
2. Procédé selon la revendication 1, caractérisé en ce que le gaz de séchage est circulé dans un circuit fermé, qui s'étend à travers le chemin de séchage (20) suivant la débouchure du courant secondaire, à travers un séparateur de produits (22), et à travers un chemin de condensation (34), et puis est rechauffé avant être divisé entre le courant primaire et le courant secondaire.
3. Procedé selon revendication 1 ou 2, caractérisé en ce que le gaz de séchage est circulé dans un circuit fermé par un ventilateur de haute pression (38) disposé entre le condensateur et le chemin de chauffage (33 à 44), et après la réglage de température est divisé entre le courant primaire et le courant secondaire.
4. Procédé selon l'un ou plusieures des revendications précédentes, caractérisé en ce que le gaz de séchage chauffé est divisé entre le courant primaire et le courant secondaire dans la relation d'environ 1 à 1.
5. Dispositif d'évacuation pneumatique, notamment pour une centrifugeuse verticale pour la mise en oeuvre du procédé selon une ou plusieures des revendications 1 à 4, comportant un tube d'évacuation (60) mouvable dans un tambour centrifuge (12) portant une tête de raclage (64) à son extrémité avant,
une enceinte de centrifugeuse (10) incluse dans un circuit d'extraction pneumatique, une boîte de raccord (16) fixée de façon étanche à l'enceinte de centrifugeuse et dans laquelle le tube d'évacuation est guidé et des dispositifs de déplacement radial et axial du tube d'évacuation sont disposés,
ledit circuit d'extraction pneumatique comportant une conduite dérivée (52) pour amener un courant primaire d'un gaz de séchage chauffé à la centrifugeuse, et une conduite dérivée (54) pour amener un courant secondaire dudit gaz de séchage chauffé à un chemin de séchage (20) connecté au tube d'évacuation (60),
caractérisé en ce que le tube d'évacuation (60) avec son extrémité aval passe de facon étanche à travers l'extrémité libre de la boîte de raccord (16) en faisant saillie de ladite boîte par une longueur correspondant au moins à sa levée de reglage axiale, cette longueur étant entourée d'un tube de gainage (18) relié à l'extrémité libre de ladite boîte de raccord (16) et se continuant dans un chemin de séchage (20), une tubulure (120) débouchant au tube de gainage (18) immédiatement en aval de la boîte de raccord, cette tubulure étant en communication avec la conduite dérivée (54) du circuit d'extraction en amenant ledit courant secondaire du gaz de séchage.
6. Dispositif d'évacuation pneumatique selon revendication 5, caractérisé en ce que la tubulure d'entrée (120) est raccordée à côté du tube de gainage (16) immédiatement en aval de l'extrémité libre de la boîte de raccord.
7. Dispositif d'évacuation pneumatique selon revendication 5 ou 6, caractérisé en ce que la tubulure (120) pour l'amenée du courant secondaire du gaz de séchage est raccordé au tube de gainage (18) sensiblement perpendiculaire à l'axe de ce tube.
8. Dispositif d'évacuation pneumatique selon une ou plusieures des revendications 5 à 7, caractérisé en ce que'une plaque de fermeture est supportée entre l'extrémité libre de la boîte de raccord (16) et une flasque du tube de gainage (18), ladite plaque comportant une passage étanche pour le tube d'évacuation (60), et remplissant l'espace annulaire en direction axiale entre ledit tube d'évacuatiom (60) et ledit tube de gainage (18) jusqu'à la débouché de la tubulure d'entrée (120).
9. Dispositif d'évacuation pneumatique selon une ou plusieures des revendications 5 à 8, caractérisé en ce que le tube d'évacuation (60) à l'intérieur de la boîte de raccord (16) est entouré avec écartement coaxial d'un tube plongeur (76), l'extrémité avant de celui-ci étant connectée au tube d'evacuation et guidée de facon étanche au moins dans la région de l'extrémité amonte (68) de la boîte de raccord (16).
10. Dispositif d'evacuation pneumatique selon revendication 9, caractérisé en ce que la périphérie extérieure du tube plongeur (76) est guidée à la fois par un bague de commande (86) supporté entre les extrémités de la boîte de raccord (16), et par un bague de glissement (78) disposé à l'extrémité de la boîte de raccord (16) en face de la centrifugeuse.
11. Dispositif d'évacuation pneumatique selon revendication 9 ou 10, caractérisé en ce qu'un cylindre de réglage a double effet et prévoit comme moteur tourneur pour le bague de commande (86), le tige de piston (96) de celui-ci formant une crémaillaire (94) s'étendant tangentiellement au bague de commande et engrenant dans une engrenage extérieure (92) du bague de commande (86),
et en ce que ledit bague de commande porte sur sa surface supérieure un cylindre (110) s'étendant en parallèle par l'axe du tube d'évacuation (60) de réglage, la tige de piston (108) de ce cylindre étant guidé en passant à travers une ouverture du bague de commande, et à l'extrémité libre étant raccordé au tube plongeur (76).
EP84112276A 1983-11-10 1984-10-12 Procédé et dispositif pour le déchargement pneumatique de centrifuges Expired EP0142698B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84112276T ATE29224T1 (de) 1983-11-10 1984-10-12 Verfahren und vorrichtung zum pneumatischen entleeren von zentrifugen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3340636 1983-11-10
DE19833340636 DE3340636A1 (de) 1983-11-10 1983-11-10 Verfahren und vorrichtung zum pneumatischen entleeren von zentrifugen

Publications (3)

Publication Number Publication Date
EP0142698A2 EP0142698A2 (fr) 1985-05-29
EP0142698A3 EP0142698A3 (en) 1986-03-26
EP0142698B1 true EP0142698B1 (fr) 1987-09-02

Family

ID=6213939

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84112276A Expired EP0142698B1 (fr) 1983-11-10 1984-10-12 Procédé et dispositif pour le déchargement pneumatique de centrifuges

Country Status (6)

Country Link
US (1) US4631048A (fr)
EP (1) EP0142698B1 (fr)
AT (1) ATE29224T1 (fr)
CA (1) CA1238029A (fr)
DE (1) DE3340636A1 (fr)
IN (1) IN160328B (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4004459C2 (de) * 1990-02-14 1995-08-31 Westfalia Separator Ag Verfahren zum Betreiben einer Zentrifuge mit einer selbstentleerenden Schleudertrommel und Zentrifuge zur Durchführung des Verfahrens
DE4013388A1 (de) * 1990-04-26 1991-10-31 Titus Hans Joachim Zentrifugen-trockner
US5087127A (en) * 1990-07-05 1992-02-11 Benjamin Knelson Removal of concentrate from a centrifugal separator
DE4410442C2 (de) * 1994-03-25 1999-04-08 Dommer Manfred Vorrichtung zur Reduzierung des Volumens und des Gewichts von Küchenabfällen und Speiseresten
DE19635346C1 (de) * 1996-08-31 1998-03-26 Wienicke Heinz Juergen Diskontinuierliche Filterzentrifuge mit einer Trocknungsvorrichtung für das schleuderfeuchte Gut
DE10104553A1 (de) * 2001-02-01 2002-11-14 Krauss Maffei Verfahrenstechni Vorrichtung zum Abschälen und Austragen eines Feststoffs aus einer Zentrifuge
DE10104552A1 (de) 2001-02-01 2002-08-08 Krauss Maffei Verfahrenstechni Vorrichtung und Verfahren zum Abschälen eines Feststoffkuchens aus einer Zentrifugentrommel
DE10256674A1 (de) 2002-12-04 2004-06-17 Baumann-Schilp, Lucia Kombinierte Entfeuchtung, Trocknung und Korngrößensteuerung von Feststoffen
CN106807310B (zh) * 2017-02-24 2018-12-14 四川弘博新材科技股份有限公司 一种电爆炸法制取纳米粉末的设备

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1321288A (en) * 1919-11-11 of little falls
US2215624A (en) * 1937-07-16 1940-09-24 Laval Separator Co De Process of removing impurities from vegetable oils
US2488747A (en) * 1946-08-10 1949-11-22 Laval Separator Co De Starch separation
US2720313A (en) * 1951-12-03 1955-10-11 Garrett Corp Liquid purification system
DE948497C (de) * 1954-09-08 1956-08-30 Krauss Maffei Ag Kontinuierlich arbeitende Zentrifuge mit einer nachgeschalteten heissgas- oder heissdampfbetriebenen Trockeneinrichtung
DE1432886A1 (de) * 1964-03-03 1969-10-23 Titus Hans Joachim Verfahren zum Ausraeumen von Vertikal-Zentrifugen
DE1782367C3 (de) * 1966-03-24 1974-02-28 Krauss-Maffei Ag, 8000 Muenchen Vorrichtung zum Entfernen des Feststoffes aus einer Zentrifuge. Ausscheidung aus: 1298448
FR206069A (fr) * 1970-06-09

Also Published As

Publication number Publication date
US4631048A (en) 1986-12-23
DE3340636C2 (fr) 1987-06-19
EP0142698A2 (fr) 1985-05-29
ATE29224T1 (de) 1987-09-15
IN160328B (fr) 1987-07-04
DE3340636A1 (de) 1985-05-23
EP0142698A3 (en) 1986-03-26
CA1238029A (fr) 1988-06-14

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