EP0406106B1 - Procédé et dispositif de réception de fibres minérales - Google Patents

Procédé et dispositif de réception de fibres minérales Download PDF

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Publication number
EP0406106B1
EP0406106B1 EP90401838A EP90401838A EP0406106B1 EP 0406106 B1 EP0406106 B1 EP 0406106B1 EP 90401838 A EP90401838 A EP 90401838A EP 90401838 A EP90401838 A EP 90401838A EP 0406106 B1 EP0406106 B1 EP 0406106B1
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EP
European Patent Office
Prior art keywords
collection
process according
machines
fibers
collection process
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
EP90401838A
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German (de)
English (en)
French (fr)
Other versions
EP0406106A1 (fr
Inventor
Hans Furtak
James Ahart
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.)
Saint Gobain Isover SA France
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Saint Gobain Isover SA France
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Publication date
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Publication of EP0406106A1 publication Critical patent/EP0406106A1/fr
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Publication of EP0406106B1 publication Critical patent/EP0406106B1/fr
Anticipated expiration legal-status Critical
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Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4209—Inorganic fibres
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4209—Inorganic fibres
    • D04H1/4218—Glass fibres
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4209—Inorganic fibres
    • D04H1/4218—Glass fibres
    • D04H1/4226—Glass fibres characterised by the apparatus for manufacturing the glass fleece
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
    • D04H1/72—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged

Definitions

  • the invention relates to techniques for receiving mineral fibers known as insulation, in particular glass fibers, with a view to the separation under the fiberizing machines, of fibers and ambient gases - in particular gases induced or having served for the drawing of these fibers - in order to make a mineral wool mattress.
  • a common type of receiving device called belt receiving is described for example in US-A-3,220,812 where it is proposed to receive fibers from a series of fiberizing machines on a single conveyor of the belt type without thin, gas permeable and under which is placed a vacuum chamber or better a plurality of independent vacuum chambers.
  • the fiber-drawing machines can be brought together to the limits of their respective dimensions, which allows relatively short lines; this point is not negligible if we know that some production lines can reach the number of 9 or more fiberizing machines, each fiberizing machine being of a diameter of the order of 600 mm for example.
  • the only lower limit to the grammage (or areal mass) of the felt produced is that dictated by the problems of mechanical strength, which therefore allows the manufacture of the lightest products likely to be obtained.
  • heavy products are understood to mean products whose grammage is for example greater than 2.5 kg / m2 in the case of glass wool products. whose micronaire is 3 per 5 g, with the exception of dense products obtained by molding and pressing which are not directly within the scope of the present invention.
  • This difficulty in obtaining is easily explained by the fact that the heavier the mattress that it is sought to produce, the greater the quantity of fibers which are deposited on the same surface of the endless belt and therefore the greater resistance to gas passage.
  • a greater depression must be exerted, which results in crushing of the felt by the pressure of the gases, especially sensitive crushing in the lower part of the felt which corresponds to the fibers harvested in the first place.
  • the mechanical performance of the product is less good.
  • the resulting deterioration in the quality of the product is very noticeable as soon as the vacuum must be raised beyond 8000 to 9000 Pa, while in certain installations a vacuum of more than 10 000 Pa is already necessary for mattresses whose grammage is 2500 g / m2.
  • this gas backflow increases the temperature in the fiber hood and therefore risk of pre-gelling of the binder, that is to say of a polymerization of the binder while the fibers are still in a unitary state, which removes almost all activity.
  • this backflow can cause the formation of wicks, that is to say dense sets of agglomerated fibers, which affect the homogeneity of the product, its appearance and lower its thermal resistance.
  • the real gain is very small because the increase in the dimensions of the hood causes an increase in the air induction and therefore in the quantity of air to be sucked.
  • a primitive of low grammage is prepared by means of a receiving device facing one or two fiberizing machines, consisting of a pair of drums rotating in reverse rotation, the perforated surface of which allows the suction of gases by suitable devices placed in the drums.
  • the primitive is formed between the drums and falls in a vertical plane before being taken up by the lapper, that is to say a pendulum device which deposits it in interlaced layers on a conveyor where the felt of the desired high grammage is obtained.
  • a lapper imposes a primitive of at least 100 g / m2 below which its mechanical resistance would be insufficient in particular to support the movements of the pendulum, and a sufficient number of superimposed layers - to have an optimization of the distribution with in every point of the felt the same number of layers.
  • the object of the invention is a new conception of the reception of units for the production of felts in mineral wool, in particular in glass wool, tending to widen the range of products capable of being produced by the same production line; this widening of the range extending to both low and heavy weights so as to increase the versatility of the production line, while preserving or even improving the quality of the products obtained.
  • the range of products produced goes, for example, from 300 g to 4000 g / m2 or more, possibly by combining a lapper.
  • the invention provides a reception method for the separation of fibers and gases produced by a plurality of fiberizing machines with a view to obtaining a mineral wool mattress, method according to which the fibers are collected by suction of the gases, each fiberizing machine i having its own collection zone Zi, the fibers collected in the various collection zones Zi being removed from the collection zone by one or more flat conveyor belts common to several zones Zi, this reception process being characterized by the fact that the areas of the collection zones Zi are increasing in the direction of increasing the grammages on said conveyor belts.
  • one operates at a constant delivery rate.
  • discharge rate is meant the percentage of gas not sucked in at the reception. Preferably, this rate is zero, and this in accordance with claim 1 even for fiberizing machines downstream of the line.
  • the collection surfaces are preferably delimited on one side by the conveyor belts themselves, which therefore form receiving belts.
  • the receptions according to the invention are receptions common to several fiberizing machines and preferably to 3 or more fiberizing machines. The number of receptions per production line therefore generally does not exceed two, which avoids the drawbacks of excessive modularization.
  • the increase in the collection surface in the areas of heavy weights makes it possible to maintain in them relatively low levels of depression, for example advantageously less than 4000 Pa, that is to say at a good level. lower than the level for which the first damage is observed for high quality fibers such as glass fibers whose micronaire is for example 3 per 5 g.
  • one chooses to operate with the same level of vacuum for all the collection surfaces.
  • we compensate completely from one collection zone to another the slightest permeability of the felt due to the thickness of felt already deposited from other fiberizing machines - and this without harming the aspiration, because as indicated in the preamble sucking only part of the gases would lead to a backflow of the fibers, especially with the formation of wicks and therefore obtaining a product of poorer quality.
  • the conveyor belts used to evacuate the fibers collected outside the collection area are conveyor belts flat, as used in most existing installations to date.
  • band plane we mean more precisely the fact that the part of the conveyor belt capable of being covered by fibers is constituted by a portion of plane and has a horizontal trajectory. It goes without saying that the conveyor belt has in fact a closed trajectory and is of the endless belt type. However, its "return" part does not play a direct role in the way in which the fibers are received.
  • the increase in grammage corresponds to the direction of travel of the conveyor belt; in this case, the n fiberizing machines can be numbered from 1 to n, so that the fibers from the first fiberizing machine are the first to settle on the conveyor belt.
  • i1 ⁇ i2 implies Zi1 ⁇ Zi2.
  • the increase in the surface of the zones Zi is obtained by an increase in the distances between the fiber-drawing machines.
  • the increase in the surface of the zones Zi is obtained by successively inclining the axes of rotation of the fiberizing machines to obtain increasingly spaced impact points on the collection surface. .
  • the increase in the distance between centers of fiber-drawing machines is not without a certain number of negative side effects, among which are obviously the extension of the production line and above all the increase in the amount of air induced. so that the enlargement of the collection surface is partly compensated from the outset by the increase in the quantity of air to be sucked.
  • the fiberizing machines are divided into groups of for example 3 or 4 forming as many reception modules as groups: each module thus corresponds to a primitive and all the primitives formed are then collected before being driven in the form of '' a single felt in the binder polymerization oven.
  • each module thus corresponds to a primitive and all the primitives formed are then collected before being driven in the form of '' a single felt in the binder polymerization oven.
  • at most two reception modules are necessary even for large tonnage production lines.
  • There is thus a modularization of the reception but a modularization which is intended to be limited in much smaller proportions than according to the prior art.
  • the receiving modules can be arranged in series one after the other with a single glass feed channel for all fiberizing machines or in parallel with in this case as many molten glass feed channels as reception modules. Subsequently, the primitives are brought together by superposition in parallel layers or in intersecting layers, the choice between these two superposition modes being carried out in particular according to the densities desired for the final products.
  • the gathering of the primitives by superposition in interlaced layers takes place with a minimum of 6 layers.
  • each reception module not one but two converging receiving bands facing each other and symmetrical to one another, the fibers deposited on one or the other band being gathered in a single felt at the common end of the receiving strips.
  • the place of final formation of the felt is located at the point of convergence of the two receiving bands.
  • the power required to drive the receiver bands is a function of the mass of fibers deposited on each of them, it is preferable to distribute the number of fiberizing machines in equal parts for each receiving strip, which makes it possible to simplify the synchronization of the speeds of the two receiving strips, synchronization necessary to prevent the two primitives formed from sliding over each other.
  • the last fiberizing machine preferably has a collecting surface shared between two receiving bands, the symmetry of the torus coming from a fiberizing machine allowing a division into two equal parts if one chooses to mount the receiver bands in such a way that their plane of symmetry contains the axis of symmetry of the torus of the central machine.
  • the fibers produced by the central fiberizing machine are deposited directly around the point of convergence, which helps in the production of a single and homogeneous felt, it being understood that even in the absence of a central machine, two separate primitives must not be formed at the same reception module.
  • FIG. 1 corresponds to the first embodiment of a reception according to the invention, for a glass wool production line comprising 4 fiber-drawing machines 1 arranged in the same row.
  • These fiberizing machines 1 constituted for example by centrifuges rotating at high speed provided at their periphery with a large number of orifices through which the molten material - preferably glass - escapes in the form of filaments which are then drawn into fibers by a concentric gas stream, parallel to the axis of the centrifuge, emitted at high temperature and speed by an annular burner.
  • fiberizing devices well known in the art can be used which all allow the formation of a core of fibers, centered on an axis, core formed by the drawing gases and especially the gases induced in very large quantities .
  • the reception of the fibers - intended to separate them from the gases - is obtained by means of an endless band 3 permeable to gases driven continuously.
  • a hood 4 laterally delimits the fiber collection zone.
  • the gas suction is obtained by independent vacuum chambers 5.
  • Each fiberizing machine 1 is associated here with a box 5.
  • a steamroller 6 ensuring pressure on the felt at the reception output.
  • the fiberizing machines 1 are all the more distant from each other as they are close to the outlet.
  • the width of the endless band being fixed, there are thus collection areas with increasing surfaces Z1 ⁇ Z2 ⁇ Z3 ⁇ Z4.
  • the increase in the distance between centers thus makes it possible not to increase - or at least to increase less - the values of depression in the boxes on the right situated in the area of heavy weights.
  • FIG. 2 A variant of this embodiment is shown diagrammatically in FIG. 2.
  • the respective increase L1, L2, L3 and L4 of the collection zones is obtained not in spreading the fiber-drawing machines (here 4 in number) in the direction of travel of the receiving strip, but by tilting the axis 2 of rotation of said machines by an angle ⁇ 1 ⁇ 2 ⁇ 3, the spacing E1 between the machines remaining constant.
  • This variant of the invention can advantageously be implemented with an already existing production installation, without significant modification of the supply circuits of the molten glass.
  • the number of fiberizing machines for a reception is equal to 3 or 4, so that for a large production line, two reception modules will be used.
  • FIG. 3 corresponds to a production line comprising 8 fiber-drawing machines 1 distributed according to two modules conforming to FIG. 1. These 8 machines 21 are supplied with molten glass by pipes 22 from a central channel 23 at the outlet d 'an oven F. Two primitives 24, 25 are formed in parallel which are grouped together - by means of angle conveyors, not shown here, which reorient the primitives in the directions indicated by the arrows 26 - in a single felt 27, before to enter an E.
  • the base 100 of smoke flow corresponds in fact to a flow of drawing gas and induced gases of 365,450 Nm3 per hour.
  • the first two tests correspond to traditional receptions with fiberizing machines also spaced every two meters, and suction lengths corresponding to these machines also constant, which means that in particular the 2 heads or end of line machines (3rd head relative to the direction of advance of the receiving conveyor belt) produce fibers received by a surface of the same dimension as that corresponding to the machines upstream.
  • suction lengths corresponding to these machines also constant, which means that in particular the 2 heads or end of line machines (3rd head relative to the direction of advance of the receiving conveyor belt) produce fibers received by a surface of the same dimension as that corresponding to the machines upstream.
  • Tests 3 and 4 correspond to the implementation of the invention according to the embodiment shown diagrammatically in FIG. 3, but with a line reduced to 6 fiberizing machines.
  • the increase in the center distances makes it possible to obtain a suction length in the area with the highest grammage much greater than that of the previous examples.
  • the maximum level of vacuum is only 4890 Pa - for a grammage of 2500 g / m2 (test n ° 3) and is not still only 8140 Pa for a grammage of 4000 g / m2 (test n ° 4), which remains a tolerable level.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Nonwoven Fabrics (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Paper (AREA)
  • Ropes Or Cables (AREA)
  • Treatment Of Liquids With Adsorbents In General (AREA)
  • Woven Fabrics (AREA)
  • Silicates, Zeolites, And Molecular Sieves (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Cookers (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Glass Compositions (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Inorganic Fibers (AREA)
  • Cosmetics (AREA)
  • Hydroponics (AREA)
EP90401838A 1989-06-29 1990-06-27 Procédé et dispositif de réception de fibres minérales Expired - Lifetime EP0406106B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP89401863 1989-06-29
EP89401863 1989-06-29

Publications (2)

Publication Number Publication Date
EP0406106A1 EP0406106A1 (fr) 1991-01-02
EP0406106B1 true EP0406106B1 (fr) 1993-12-22

Family

ID=8202966

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90401838A Expired - Lifetime EP0406106B1 (fr) 1989-06-29 1990-06-27 Procédé et dispositif de réception de fibres minérales

Country Status (21)

Country Link
US (1) US5056195A (da)
EP (1) EP0406106B1 (da)
JP (1) JPH0340817A (da)
KR (1) KR910001132A (da)
AT (1) ATE99004T1 (da)
AU (1) AU631880B2 (da)
BR (1) BR9003074A (da)
CS (1) CS317690A2 (da)
DD (1) DD296321A5 (da)
DE (1) DE69005378T2 (da)
DK (1) DK0406106T3 (da)
ES (1) ES2048993T3 (da)
FI (1) FI903271A0 (da)
HU (1) HU209899B (da)
IE (1) IE64970B1 (da)
NO (1) NO169354C (da)
PL (1) PL164733B1 (da)
SI (1) SI9011196A (da)
TR (1) TR24504A (da)
YU (1) YU47163B (da)
ZA (1) ZA904440B (da)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI94967C (fi) * 1991-09-18 1995-11-27 Yhtyneet Paperitehtaat Oy Menetelmä ja laite aineradan kuivamuodostukseen pitkäkuituisesta materiaalista
US5455991A (en) * 1994-02-03 1995-10-10 Schuller International, Inc. Method and apparatus for collecting fibers, and product
DE19834963A1 (de) * 1998-08-03 2000-02-17 Pfleiderer Daemmstofftechnik G Vorrichtung und Verfahren zur Herstellung von Mineralwollevlies
US20040132371A1 (en) * 1998-08-03 2004-07-08 Pfleiderer Dammstofftechnik International Gmbh & Co. Method and device for producing a mineral wool nonwoven fabric
DE10163054B4 (de) * 2001-12-21 2004-01-08 G. Siempelkamp Gmbh & Co. Streugutanlage zum Streuen von Streugut, insbesondere beleimten Holzspänen, Holzfasern oder dergleichen, auf einen Streubandförderer

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2714081A (en) * 1950-03-17 1955-07-26 William H Rambo Process of forming fibrous sheets
US2993239A (en) * 1954-11-08 1961-07-25 Weyerhaeuser Co Production of integral layered felts
US2913365A (en) * 1954-12-01 1959-11-17 C H Dexter & Sons Inc Fibrous webs and method and apparatus for making same
US3071822A (en) * 1959-03-03 1963-01-08 Bowater Board Company Method and apparatus for forming a mat
NL283801A (da) * 1961-10-17 1900-01-01
US3509604A (en) * 1967-10-03 1970-05-05 Int Paper Co Air laying system having a seal roll
US3546898A (en) * 1967-12-28 1970-12-15 Owens Corning Fiberglass Corp Nonuniform motion producing structure for producing fibrous mats
AT322963B (de) * 1970-10-30 1975-06-25 Arledter Hanns F Dr Ing Verfahren zur blattbildung bei einer doppelsieb-papiermaschinen
US3824086A (en) * 1972-03-02 1974-07-16 W M Perry By-pass fiber collection system
CA991409A (en) * 1972-03-21 1976-06-22 Dale Kleist Method and apparatus for producing and collecting fibers
US3787194A (en) * 1972-05-16 1974-01-22 Johns Manville Collection chamber for making mats of inorganic fibers
US3961397A (en) * 1974-11-21 1976-06-08 Scott Paper Company Clump removal devices
AT356505B (de) * 1977-07-27 1980-05-12 Escher Wyss Gmbh Stoffauflauf fuer papiermaschinen
US4353686A (en) * 1981-01-19 1982-10-12 Formica Corporation Apparatus for air-layer fibrous webs
JPS586682A (ja) * 1981-07-06 1983-01-14 Sony Corp 固体撮像装置
US4495119A (en) * 1982-07-12 1985-01-22 Raymond Chung Method for producing homogeneous batts of air-laid fibers

Also Published As

Publication number Publication date
IE902342L (en) 1990-12-29
NO169354C (no) 1992-06-10
IE902342A1 (en) 1991-01-16
HUT62244A (en) 1993-04-28
ZA904440B (en) 1993-03-05
KR910001132A (ko) 1991-01-30
NO902792L (no) 1991-01-02
DE69005378D1 (de) 1994-02-03
DE69005378T2 (de) 1994-06-01
FI903271A0 (fi) 1990-06-28
YU119690A (sh) 1992-12-21
PL285858A1 (en) 1991-02-25
HU904025D0 (en) 1990-12-28
AU5683090A (en) 1991-01-03
ATE99004T1 (de) 1994-01-15
HU209899B (en) 1994-11-28
DK0406106T3 (da) 1994-03-28
TR24504A (tr) 1991-11-01
IE64970B1 (en) 1995-09-20
SI9011196A (en) 1994-12-31
EP0406106A1 (fr) 1991-01-02
BR9003074A (pt) 1991-08-27
JPH0340817A (ja) 1991-02-21
NO169354B (no) 1992-03-02
DD296321A5 (de) 1991-11-28
PL164733B1 (pl) 1994-10-31
US5056195A (en) 1991-10-15
NO902792D0 (no) 1990-06-22
AU631880B2 (en) 1992-12-10
YU47163B (sh) 1995-01-31
ES2048993T3 (es) 1994-04-01
CS317690A2 (en) 1991-08-13

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