EP0280127B1 - Vibrierender Windsichter zur dichteabhängigen Trennung von heterogenen Schüttgütern - Google Patents

Vibrierender Windsichter zur dichteabhängigen Trennung von heterogenen Schüttgütern Download PDF

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Publication number
EP0280127B1
EP0280127B1 EP88102053A EP88102053A EP0280127B1 EP 0280127 B1 EP0280127 B1 EP 0280127B1 EP 88102053 A EP88102053 A EP 88102053A EP 88102053 A EP88102053 A EP 88102053A EP 0280127 B1 EP0280127 B1 EP 0280127B1
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EP
European Patent Office
Prior art keywords
air
separator
side frames
vibrating
dust
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 - Lifetime
Application number
EP88102053A
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English (en)
French (fr)
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EP0280127A3 (en
EP0280127A2 (de
Inventor
Francesco Ferrero
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OFFICINE MECCANICHE FERRERO SpA
Ferrero SpA
Original Assignee
OFFICINE MECCANICHE FERRERO SpA
Ferrero SpA
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Priority to AT88102053T priority Critical patent/ATE65719T1/de
Publication of EP0280127A2 publication Critical patent/EP0280127A2/de
Publication of EP0280127A3 publication Critical patent/EP0280127A3/en
Application granted granted Critical
Publication of EP0280127B1 publication Critical patent/EP0280127B1/de
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Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B9/00—Combinations of apparatus for screening or sifting or for separating solids from solids using gas currents; General arrangement of plant, e.g. flow sheets
    • B07B9/02—Combinations of similar or different apparatus for separating solids from solids using gas currents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B4/00—Separating by pneumatic tables or by pneumatic jigs
    • B03B4/02—Separating by pneumatic tables or by pneumatic jigs using swinging or shaking tables
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B13/00—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices
    • B07B13/14—Details or accessories
    • B07B13/16—Feed or discharge arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
    • B07B7/06—Selective separation of solid materials carried by, or dispersed in, gas currents by impingement against sieves

Definitions

  • This invention covers a pneumodensitometric vibrating separator table for separation of heterogeneous bulk products, in particular compost, i.e. to separate fertilizers obtained through aerobic biotransformation of putrescible organic solid domestic wastefractions, from other foreign matter not yet kept back during previous sorting.
  • Pneumodensitometric vibrating separators are known in which the vibrating or oscillating table, provided with a permeable bottom or bed through which air flows so as to form an air stream fluidizing the heterogenous matter to be sorted out which is located above this air stream.
  • this vibrating or oscillating motion is unidirectional according to pulses having a 20°-30° inclination with respect to the longitudinal sorting plane, this inclination being based upon the material to be treated; furthermore, the inclination angle of the separator table has the same direction as the vibration or oscillation pulse angle.
  • the heterogeneous material on the table is thus separated by gravity due to the upwards penetrating air stream; the particulate matter having a higher specific gravity will tend to move downwards in touch with the table, while those with a lower specific gravity will tend to float.
  • a vibrating separator as described is known by EP-A-0081072 in which it is substantially foreseen an inclinated, oscillating and permeable table, on which the heterogeneous material is separated by gravity and by air stream fluidizing.
  • This document aims to better the separation adopting on the table transversal plates, useful to detain the heterogeneous material over the heavier components.
  • a first drawback is caused by the fact that existing pneumodensitometric tables have a rather uneven vibrating or oscillating motion because of their poorly secured, scantily stretched, flat perforated bottom. As a result, the perforated plate will be subject to deformation, particularly during use, losing its stiffness and uniform movement, negatively affecting the sorting operation.
  • a second drawback is due to the vibration and oscillation characteristics as currently used, which do not allow for adequate separation of very dense, tine particle layers such as for instance glass splinters, sand, porcelane or earthenware chips, small pieces of rigid plastic material etc.
  • Another disadvantage lies in the fact that it is impossible with existing pneomodensitometric separators to change the direction of vibration or oscillation so that the operating conditions cannot be adjusted to the nature of the material to be treated.
  • This patent has the aim to eliminate all above listed drawbacks of the known pneumodensitometric separators and to optimize sorting of heterogeneous bulk material.
  • the fluidizing bed is centered and is resting on intermediate supports.
  • the table is well secured and the vibratory motion over its whole surface is perfectly uniform.
  • the vibratory or oscillating motion is directly and evenly transmitted to the sorting plane by means of stiffening side frames.
  • a rather high vibration frequency with low amplitude has been chosen so as to boost separation of even small sized high density matter.
  • the unidirectional vibratory motion is indeed involving 1000 to 3000 vibrations per minute with a 0.5-4 mm amplitude.
  • unidirectional vibration is achieved by two vibrators or rotary propelling devices having controlled eccentric masses generating centrifugal forces by their identical and coplanar opposed rotation.
  • the propelling assembly is rigidly connected to the side frames by means of sturdy links so that the two equal and opposed centrifugal forces, when combined, will provide the unidirectional reciprocating force necessary to impress the required motion.
  • the system connecting the propelling devices to the side frames permits to vary the angle ⁇ resulting from the direction of the vibration force and the longitudinal plane of the separator and this system is also equipped with longitudinal conveyance facilities, so that the unidirectional vibratory forces are always passing through the center of gravity of the machine. It follows that the movement of the pneumodensitometric table can be adjusted based upon the quality of the material to be classified, in order to ensure its operation in optimum conditions.
  • the drawback regarding the non uniform fluidizing action of the air stream is obviated by using a special sandwich panel as a permeable bed, the top of which is consisting of a closely perforated metal sheet (with closely-spaced holes having a diameter ranging between 0.5 and 0.6 mm), while the bottom is consisting of a high strength but low permeability filter fabric (nylon, polyester or polyamide, etc.).
  • This sandwich panel will require a high air generator pressure (about 450-550 mm w.c.) to obtain an adequate air flow for fluidizing of the material, while the down flow will be virtually independent from the height of the top layer of the material.
  • the Patent also eliminates the trouble caused by the fact that dust raised during fluidizing of the material and now collected by dust collectors has to be conveyed to cyclones and separate dust catching filters.
  • the dust collecting system is an integrating part of the separator and is consisting of a filter mounted on the pneumodensitomteric table so as to create a plenum chamber from which coarser dust particles will fall back onto the table, whereas the finer particles are held back by the filter, there to felt up or agglomerate, until they are periodically returned to the fluidizing bed. This greatly simplifies dust catching equipment since a separate delivery system with all related handling problems is no longer necessary.
  • the system also includes facilities for processing of special materials containing shreds of plastics or other fibrous fabrics which tend to flutter during fluidizing.
  • the pneumodynamometric Table may perform an oscillating movement, i.e. a low frequency reciprocating movement (150-450 cycles/minute and high amplitude raging between 10 and 40 mm).
  • the porous sandwich panel 1 is consisting of a closely perforated metal top sheet 2 and in a bottom filtering cloth 3 in moisture resisting synthetic fabric.
  • This porous panel 1 is placed transversally, in a centered position, properly shimmed 4, resting on the frame of the separator so as to ensure a stable configuration.
  • the flanged panel edges are braced by stirrups 5 and turnbuckles 6 mounted on the side frames 7. This ensures a stable position of the perforated panel and its uniform vibratory motion.
  • this sandwich panel has high strength and low permeability with respect to the fluidizing air flow.
  • a closed chamber 8 is communicating at its lower end by means of an elastic coupling 9, with a high pressure fan 10 pressing the air through the porous panel.
  • the tubular cross member 12, bearing the vibrators 11, is supported by U bolts 13 which can be moved along the sections 14, rigidly connected to the side frames 7.
  • the vibrators 11 can rotate on the axis of the cross member 12 so that it will be possible to adjust the inclination angle ⁇ of the vibratory directions with respect to the longitudinal plane of the table 1 and the vibrators 11 can also be moved lengthwise forwards and backwards on the sections 14, so that the unidirectional vibrating force will pass through the center of gravity G of the vibrating part of the machine.
  • This longitudinal traverse of the cross member 12 can be achieved, for example, by providing the section 14 with numerous holes in which the threaded ends of the U bolts 13 can be fitted.
  • the pneumodensitometric table is supported by an appropriate mounting or frame 15 by means of flexible devices 16 such as cables, ropes, chains etc. secured to hooks 17 on the side frames 7.
  • These flexible supporting means 16 are adjustable to ensure uniform distribution of the weight and position control of the table at its optimum longitudinal inclination angle ⁇ with respect to the horizontal plane.
  • This angle ⁇ has the same direction as the angle ⁇ of the vibration forces with respect to the table plane.
  • the unidirectional vibratory force has an ⁇ + ⁇ inclination with respect to the horizontal plane.
  • An outlet 18 for the heavier particles B is provided in the upper section of the table while another outlet 19 in the lower table section discharges the finer and lighter particles C.
  • the outlet 19 is fitted with an adjustable diaphragm 19 ⁇ determining the layer thickness of the material on the table.
  • a feeder trough 10 delivers the product A on the pneumodensitometric table 1 for selection.
  • the above explanations clearly illustrate the operation cycle.
  • the product A to be sorted out is fed on the pneomodensitometric table 1 where it is fluidized by the air passing through the perforated plate. This will cause the broad or flat shaped light weight material having a low specific gravity, to be air entrained, without being effected by the vibratory impulses exerted on the table, while material having a high specific gravity will tend to settle on the vibrating surface and is thus moved forward under these pulse conditions.
  • a dust filter chamber 21 is located above the mounting 15 and is secured to the side frames of the pneumodensitometric table by means of a bellows 22.
  • This filter chamber 21 is housing cloth tube filters 21 ⁇ . Dust is sucked through these cloth tubes by means of a suction fan 23.
  • This configuration permits to combine the vibrating separator and dust filter in one single structure, thus offering additional functional advantages, since a spacious plenum chamber is available between the pneumodensitometric table and the dust filter, which is very useful for collection of coarse dust particles. Furthermore, any dust settling externally on the cloth tube filter 21 ⁇ will tend to agglomerate or felt and can be periodically discharged once more on the vibrating table. This will make a separate dust selection unnecessary, since the dust is mixed with the lighter products C.
  • this patent presents a handy facility for separation and recovery of such air entrained waste.
  • This equipment is illustrated in Fig. n° 5 and n° 6 and is consisting of a loop shaped wire gauze or nylon belt 24 moving on two rolls or drums 25, 26, one of which 26 is motor-driven, acting as a tension roller and located at the back of the machine.
  • This horizontal belt is intersecting the plenum chamber above the pneumodensitometric table and its lower leg moves towards the external roll 26.
  • the lower outlet threshold 30 can be moved backward so that the air will prevailingly flow in direction of the arrow x with respect to y, to prevent the dust suction fan from generating excessive indraught in the machine which might detach the air entrained particles from the belt or prevent them from being externally discharged.
  • the agglomerated dust when falling from the filter 21 will initially drop onto the upper belt section 24, to be conveyed to the roll 25 and from there dropped onto the pneumodensitometric table 1, to be subsequently discharged together with the lighter particles.
  • the separator has therefore excellent operating features for sorting and classifying of heterogeneous material of any nature whatsoever; it has a built-in dust filter without separate dust recovery and also permits separation of air entrained matter which would be difficult to recover with existing separators.

Landscapes

  • Combined Means For Separation Of Solids (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
  • Electrostatic Separation (AREA)
  • Cleaning In General (AREA)
  • Fats And Perfumes (AREA)
  • Seasonings (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Characterised By The Charging Evacuation (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)

Claims (7)

  1. Vibrierender Windsichter zur dichteabhängigen Trennung und Entnahme von heterogenen Schüttgütern, bestehend aus einem vibrierenden oder hin- und hergehenden Tisch, der mit einem Bett zur Fluidifizierung des Gutes mittels Luft ausgestattet ist, wobei die Luft durch ein Gebläse (10) abgegeben wird, während der Tisch (1) durch eine einseitige Vibrationswirkung unter einem Winkel α in bezug auf den Tisch bewegt wird, und der Längsneigungswinkel α' die gleiche Richtung wie der Winkel α besitzt, so daß die einseitige Vibrationswirkung einen Neigungswinkel α + α' in bezug auf die horizontale Ebene aufweist, wobei ferner Einrichtungen zum Sammeln des vom Luftstrom mitgenommenen Staubes vorgesehen sind, gekennzeichnet durch die folgenden Kombinationsmerkmale:
    a) Der poröse Tisch 1 ist aus Schichten aufgebaut, wobei die obere Schicht (2) aus einer eng perforierten Metallplatte und die untere Schicht (3) aus einem feuchtigkeitsbeständigen künstlichen Bespannstoff besteht; der Tisch ist durch geeignete Beilagen (4) quer zentriert und gelagert; er ist entlang seiner Seitengestelle (7) fest und gleichmäßig durch Spannvorrichtungen (5, 6) abgestützt, sodaß eine große Steifigkeit und eine geringe Durchlässigkeit für fluidifizierende Luft gesichert ist,
    b) die Vibrationsbewegung wird durch zwei, mit gegenläufig rotierenden exzentrischen Massen ausgestatteten drehbare Elektrovibratoren (11) erzeugt, die an den entgegengesetzten Enden eines kräftigen rohrförmigen Quergliedes (12) befestigt sind, sodaß die beiden Vibratoren in einer Ebene und parallel liegen und die beiden gleichen Zentrifugalwirkungen eine in einer Richtung wirkende hin- und hergehende Kraft hervorrufen, die in bezug auf die Tischlängsebene einen Neigungswinkel (α) besitzt,
    c) der Tisch (1) ist mittels verformbarer Mittel (16) an einem Rahmen (15) befestigt, wobei diese verformbaren Mittel der Länge nach einstellbar sind um eine gleichmäßige Positionierung des Tisches zu erreichen und eine Veränderung seines Neigungswinkels α' zu ermöglichen;
    d) Das an seinen Enden die Elektrovibratoren lagernde Querglied (12) ist an den Seitengestellen (7) des Tisches (1) mittels geeigneter Vorrichtungen (13,14) befestigt, die eine Veränderung des Winkels α der Vibrationskraft in bezug auf die Längsebene des Tisches und auch eine Längsverschiebung dieses Quergliedes (12) und seiner Elektrovibratoren (11) gestatten, sodaß die Vibrationskraft durch den Schwerpunkt (G) des vibrierenden Teiles der Maschine verläuft;
    e) Ein Staubfilter (21) mit einem Saugzuggebläse (23) und Filterschläuchen (21') ist am Tischrahmen (15) befestigt, wobei das Filter (21) mit den Seitengestellen (7) des Tisches mittels eines Balges (22) verbunden ist, wodurch eine Kammer begrenzt wird, in der die groben Staubpartikel herabfallen, um eine Zusammenballung des gesammelten Staubes zu ermöglichen, der auf den Tisch fällt, um zusammen mit dem leichtgewichtigten Gut (C) am unteren Tischende ausgetragen zu werden, sodaß die Notwendigkeit einer eigenen Staubentnahme entfällt;
    f) Eine besonder Vorrichtung zum Sammeln von von der Luft mitgenommenem Material, z.B. Kunststoffilme, Papier, Blätter, Zupfleinwand etc., ist innerhalb der Kammer zwischen dem Tisch (1) und dem Filter (21) angeordnet; diese Vorrichtung besteht aus einem geschlossenen Drahtgewebeband (24), das über zwei Rollen (25, 26) läuft, wobei die äußere Rolle (26) angetrieben ist und der untere Teil des Bandes sich gegen die äußere Rolle (26) bewegt, sodaß sich die von der Luft mitgenommenen Dinge zufolge der Hubkraft der von Tisch (1) zum Filter (21) strömenden Luft an das untere Band anlegen, um nach außerhalb der Maschine transportiert und mittels eines Luftstromes (28) und einer drehenden Reinigungsbürste (29) entladen zu werden.
  2. Windsichter nach Anspruch 1, dadurch gekennzeichnet, daß die Spannvorrichtungen des porösen Tisches (1) aus Bügeln (5) und Spannschrauben (6) bestehen, die an den Seitengestellen (7) befestigt und in die mit Flanschen versehenen Kanten des Tisches (1) eingehakt sind.
  3. Windsichter nach Anspruch 1, dadurch gekennzeichnet, daß die Vorrichtungen, die die Elektrovibratoren (11) lagernden rohrförmigen Querglieder (12) an den Seitengestellen (7) des Tisches (1) befestigen aus U-Bolzen (13) bestehen, die der Länge nach an Profilen (14) beweglich sind, die ihrerseits an den Seitengestellen (7) befestigt sind, sodaß eine Veränderung des Neigungswinkels α der in einer Richtung wirkenden Vibrationskrraft in bezug auf die Längsebene des Tisches möglich ist, wobei diese Längsbewegung sichert, daß die Vibrationskraft immer durch den Schwerpunkt (G) des vibrierenden Teiles geht.
  4. Windsichter nach Anspruch 1, dadurch gekennzeichnet, daß die, durch die mit exzentrischen Massen versehenen Elektrovibratoren (11) erzeugte Bewegung eine in einer Richtung wirkende Vibrationsbewegung hoher Frequenz und einer kleinen Amplitude im Bereich zwischen 0,4 und 0,5 mm ist.
  5. windsichter nach Anspruch 1, dadurch gekennzeichnet, daß das Elektrogebläse 10, das die fluidifizierende Luft erzeugt, eine sehr große Druckhöhe von etwa 450 bis 500 mm Wassersäule aufweist.
  6. Windsichter nach Anspruch 1, dadurch gekennzeichnet, daß die untere Auslaßschwelle (30) rückwärts angeordnet und verstellbar ist, sodaß die durch das Band strömende Luft gegenüber der entlang des Bandes strömenden Luft überwiegt.
  7. Windsichter nach Anspruch 1, dadurch gekennzeichnet, daß der Sichter durch eine hin- und hergehende Bewegung niederer Frequenz im Bereich von 150 bis 450 Schwingungen pro Minute und einem Amplitudenbereich zwischen 10 bis 40 mm angetrieben sein kann.
EP88102053A 1987-02-27 1988-02-12 Vibrierender Windsichter zur dichteabhängigen Trennung von heterogenen Schüttgütern Expired - Lifetime EP0280127B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88102053T ATE65719T1 (de) 1987-02-27 1988-02-12 Vibrierender windsichter zur dichteabhaengigen trennung von heterogenen schuettguetern.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT1242887 1987-02-27
IT8712428A IT1208249B (it) 1987-02-27 1987-02-27 Separatore a tavola pneumodensime trica vibrante per la selezione diprodotti sfusi eterogenei

Publications (3)

Publication Number Publication Date
EP0280127A2 EP0280127A2 (de) 1988-08-31
EP0280127A3 EP0280127A3 (en) 1989-06-07
EP0280127B1 true EP0280127B1 (de) 1991-07-31

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EP88102053A Expired - Lifetime EP0280127B1 (de) 1987-02-27 1988-02-12 Vibrierender Windsichter zur dichteabhängigen Trennung von heterogenen Schüttgütern

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EP (1) EP0280127B1 (de)
AT (1) ATE65719T1 (de)
DE (1) DE3863938D1 (de)
ES (1) ES2024561B3 (de)
IT (1) IT1208249B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022112657A1 (en) 2020-11-26 2022-06-02 Magsort Oy Separation of stainless steel slag

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19654255B4 (de) * 1996-12-23 2007-08-30 Herhof Verwaltungsgesellschaft Mbh Verfahren und Vorrichtung zur Behandlung von Abfall oder Restabfall
CZ307269B6 (cs) * 2008-04-16 2018-05-09 Psp Engineering A. S. Třídič sypkého materiálu
CN112619896B (zh) * 2020-11-27 2023-04-28 江苏宇星科技有限公司 一种三氧化二铁浆料筛选除铁系统
CN117679950B (zh) * 2024-02-02 2024-06-11 北京中科润宇环保科技股份有限公司 一种防堵塞的干法脱酸灰循环返料装置及工作方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0081072A2 (de) * 1981-12-09 1983-06-15 Carl Schenck Ag Schwingrinne mit Fluidisiereinrichtung zur Trennung eines Schüttgutgemisches unterschiedlicher Dichte in Fraktionen mit im wesentlichen gleicher Dichte

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3148475A1 (de) * 1981-02-23 1982-09-23 Gebrüder Bühler AG, 9240 Uzwil "trennvorrichtung fuer getreide und aehnliches korngut"
EP0181353B1 (de) * 1984-05-08 1988-06-01 Bühler AG Vorrichtung und verfahren zum trennen von körnigem gut
DE3606238C2 (de) * 1985-03-11 1997-05-07 Gen Kinematics Corp Schwingscheider
DE3616946A1 (de) * 1986-05-20 1987-11-26 Organ Faser Technology Co Verfahren zum trennen einer heterogenen menge aus festem material in fraktionen und vorrichtung zur durchfuehrung des verfahrens

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0081072A2 (de) * 1981-12-09 1983-06-15 Carl Schenck Ag Schwingrinne mit Fluidisiereinrichtung zur Trennung eines Schüttgutgemisches unterschiedlicher Dichte in Fraktionen mit im wesentlichen gleicher Dichte

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022112657A1 (en) 2020-11-26 2022-06-02 Magsort Oy Separation of stainless steel slag

Also Published As

Publication number Publication date
DE3863938D1 (de) 1991-09-05
EP0280127A3 (en) 1989-06-07
IT8712428A0 (it) 1987-02-27
IT1208249B (it) 1989-06-12
ES2024561B3 (es) 1992-03-01
EP0280127A2 (de) 1988-08-31
ATE65719T1 (de) 1991-08-15

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