IE60892B1 - Belt with non-woven fabric for driving a conveyor belt - Google Patents

Belt with non-woven fabric for driving a conveyor belt

Info

Publication number
IE60892B1
IE60892B1 IE170588A IE170588A IE60892B1 IE 60892 B1 IE60892 B1 IE 60892B1 IE 170588 A IE170588 A IE 170588A IE 170588 A IE170588 A IE 170588A IE 60892 B1 IE60892 B1 IE 60892B1
Authority
IE
Ireland
Prior art keywords
fibres
belt
web
fibre
metal
Prior art date
Application number
IE170588A
Other versions
IE881705L (en
Original Assignee
Lohmann Gmbh & Co Kg
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 Lohmann Gmbh & Co Kg filed Critical Lohmann Gmbh & Co Kg
Publication of IE881705L publication Critical patent/IE881705L/en
Publication of IE60892B1 publication Critical patent/IE60892B1/en

Links

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
    • D04H1/4242—Carbon 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
    • 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
    • D04H1/4234—Metal 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
    • D04H1/4282—Addition polymers
    • D04H1/4291—Olefin series
    • 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
    • D04H1/4326—Condensation or reaction polymers
    • D04H1/435—Polyesters
    • 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
    • D04H1/44—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 the fleeces or layers being consolidated by mechanical means, e.g. by rolling
    • D04H1/46—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 the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres
    • D04H1/498—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 the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres entanglement of layered webs
    • 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
    • D04H1/58—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 by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives
    • D04H1/64—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 by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives the bonding agent being applied in wet state, e.g. chemical agents in dispersions or solutions
    • D04H1/645—Impregnation followed by a solidification process
    • 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
    • D04H13/00—Other non-woven fabrics

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Belt Conveyors (AREA)
  • Woven Fabrics (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
  • Nonwoven Fabrics (AREA)
  • Vehicle Step Arrangements And Article Storage (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
  • Structure Of Belt Conveyors (AREA)
  • Artificial Filaments (AREA)
  • Package Frames And Binding Bands (AREA)
  • Laminated Bodies (AREA)
  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Conductive Materials (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)

Abstract

The invention seeks to provide a band containing non-woven fabric, for drive and conveyor belts, which band does not build up electric charges. The fibre mixture of the non-woven fabric contains about 1 to 10 % by weight of electrically conductive fibres. <IMAGE>

Description

The invention relates to a belt for drive/transmission belts and forwarding/conveyor belts with metal fibres.
Drive/transmission belts and forwarding/conveyor belts are inter alia produced using bonded fibre web materials of minimal extensibility with or without a certain amount of elasticity in order that lengthening of the conveyor belt during use and the consequently necessary retensioning may be avoided.
One problem with such belts is the tendency for electric 10 charges to build up on the belt, for example in the manner known from the principle of a van der Graff generator. This effect is extremely undesirable in particular for the transport of sensitive, for example electronic, parts.
It is already known to confer antistatic properties on bonded 15 fibre web materials. For instance, to avoid the electrostatic charge build-up in floor coverings and other materials with a synthetic fibre content it has already been proposed to incorporate conductive fibres into them. t, ) / DE-A-20 16 403 proposes avoiding electrostatic charge build20 up in carpets by using for tufted carpets and needle webs a backing fabric comprising filament or spun yarns from a fibre blend with metallic or metallised fibres.
Similarly, DE-C-19 17 587 describes the addition of metal, preferably steel fibres, to a laminate composed of various fibre materials.
V To avoid electrostatic charge build-up in turntables of record players, DE-C-24 57 542 proposes incorporating metal fibres, in particular steel fibres, into the felt coverings of these turntables .
Conductive filter cloths made of a web having a metal fibre content are described in Textile Institute and Industry, 7., (1972), 199.
FR-A-2 181 564 discloses a transport belt composed of a synthetic textile woven material in which, to prevent electrostatic charge build-up through reduction in the electric resistance, at least the warp threads of the woven belt are metal threads which have a diameter of the order of 15/100 mm and a mutual spacing of the order of 1 cm. Woven fabrics, as mentioned earlier [sic], give rise to extensibility problems.
The state of the art features the use of webs which were not subject to any special requirements in respect of resistance to longitudinal extension and are unsuitable for conveyor belts.
It has also already been proposed that, to avoid electrostatic charge build-ups, such conveyor belts be manufactured using binders or coating compositions admixed with conductive substances, usually carbon black or metal dust. This has the disadvantage that it always produces dark-coloured conveyor belts although for many purposes, as in the electronics or food industry, it would in fact be desirable to have very light-coloured belts. The existing belts were either too costly to manufacture or disadvantageous on account of a fastwearing coating. The problem has intensified through the v increasing use of synthetic fibres which, owing to their favourable properties, are highly suitable for the purpose of achieving conveyor belts of constant length but which are particularly prone to electrostatic charge build-up.
It is consequently an object of the invention to construct web-containing belts for drive/transmission and forwarding/conveyor belts in such a way as to make it possible to avoid any electrostatic charge build-up on the conveyor belts .
This object is achieved according to the invention by a congeneric belt material with metal fibres, wherein the belt has been formed from a fibre web which contains from 1 to 10 % by weight of steel fibres, the steel fibres being uniformly arranged over the entire cross-section of the web.
As fibre webs it is possible to use a very wide range of webs, for example needled webs, random-laid webs or the like.
The fibre blend making up the fibre web may contain synthetic and/or natural and/or regenerated fibres, for example polyester, polyamide, polypropylene, polyacrylic, cotton, coconut, viscose staple fibres or the like.
It is particularly preferable for the belt to contain one or more high-strength, low-stretch yarns, filaments, woven fabrics or laid fabrics composed of synthetic and/or natural and/or regenerated fibres. Suitable fibres for incorporation include inter alia polyester, polyamide, polypropylene, viscose staple, polyaramid, glass and ceramic fibres or combinations thereof.
As electrically conductive fibres it is possible to use those ) based on at least one metal or elemental carbon.
/ It is possible to use for example steel fibres or copper fibres for this purpose, but it is also possible to use metallised, for example coppered or silvered, filaments. Carbon for the purposes of the present invention encompasses conductive carbon modifications, such as graphite whiskers.
In a preferred embodiment, it is advantageous to use for this purpose steel fibres having a linear density of 0.8 - 18 dtex, preferably 3-10 dtex, and a staple length of 20 - 80 mm.
It is preferable if the surface resistance of the web material at a voltage of 100 V is from 102 to 108, preferably from 10A to 106, ohm.
It is possible to use hydrophobic binders, such as a nitrilebutadiene rubber and/or styrene-butadiene rubber latex.
A conductive bonded fibre web material for transmission, forwarding and conveyor belts is preferably made of a mechanically needled synthetic fibre web with incorporated conductive fibres and a binder with which the basic web is impregnated. In making the web material, which may contain one or more woven or laid fabrics, the fibre web is admixed with conductive fibres, and the mechanically consolidated web is then impregnated with a binder solution and thereafter dried at a temperature of 100°C.
The mixture of fibres for this fibre web material may comprise synthetic and/or natural and/or regenerated fibres. As synthetic fibres it is advantageous to use for example polyester fibres, polypropylene fibres or mixtures thereof, in particular because of their high durability but also because of their low price.
The electrically conductive fibres used are particularly ' preferably those which are based on at least one highly conductive and flexible metal, such as copper, iron, aluminium or fibres coated with a conductive metal, or elemental carbon.
Preferred binders are nitrile-butadiene rubber and/or styrenebutadiene rubber latex. As binder it is possible to use for example aqueous dispersions of nitrile-butadiene rubber, styrene-butadiene rubber latex or solvent-dissolved binders, such as polyurethane, polyvinyl chloride, polyacrylate or mixtures thereof.
Here the ratio of fibre to binder can preferably be from 1 : 2 to 2 : 1, particularly preferably 1:1, parts by weight.
The impregnated and dried web material can then be sanded on one or both sides, for example with emery paper, to improve the surface.
A web suitable for manufacturing drive, forwarding and conveyor belts can have a thickness of 1 - 8 mm, preferably 2-5 mm, and a basis weight of 300 - 6,000, preferably 1,000 - 4,000, g/m2.
A conductive web material for drive, forwarding and conveyor belts according to the present invention comprises a preferably synthetic fibre web which has been mechanically consolidated, binders and fillers, dyes and vulcanising agents, wherein the fibre mixture contains 1 - 10 % by weight of conductive fibres made of steel, graphite, viscose staple or of silvered or copper-contained fibres.
Further features and advantages of the invention will be apparent from the following description of a preferred embodiment example with reference to the drawings depicting a belt according to the invention, where Fig. 1 is a plan view of part of a belt according to the present invention, and Fig. 2 is a cross-section of the part of the belt of Fig. 1.
As shown in Fig. 1, a belt according to the present invention has been formed with a fibre web layer 10, which in this instance contains 10 % by weight of 6 dtex steel fibres. In the cross-section of Fig. 2 it can be seen that the steel fibres are uniformly distributed over the entire thickness of the web.
Example: A woven or laid polyester fabric formed from 6 1100 dtex threads in the longitudinal direction and 3 1100 dtex threads in the transverse direction and having a basis weight of about 100 g/sq. m is needled on both sides with 950 g/sq. m of polyester fibres consisting of 2 parts at 6.7 dtex and 1 part at 17 dtex, into which 2 % by weight of 9 dtex steel fibres have been mixed, so that the thickness of the web is 6 mm, the basis weight is 2000 g/sq. m and the density is 0.33 g/cubic centimetre.
The basic web is then impregnated with 100 % by weight of nitrile-butadiene rubber latex to which 25 % by weight of calcium carbonate as filler and 5% by weight of vulcanising aid comprising sulphur and zinc oxide have been added, coagulated in an infrared duct, washed out, dewatered and then dried and vulcanised at 150° Celsius. Thereafter the binderconsolidated web material is sanded on both sides and 120 grain emery paper to produce a uniformly smooth surface and a thickness of 5.5 mm. \ , V The product has a surface resistance of 1 X 10 ohm at an applied voltage of 100 V.

Claims (6)

Claims
1. A belt for drive/transmission belts and forwarding/conveyor belts with metal fibres, characterised in that the belt has been formed from a 5 fibre web which contains from 1 to 10 % by weight of steel fibres, the steel fibres being uniformly arranged over the entire cross-section of the web.
2. A belt according to Claim 1, characterised in that the fibre mixture comprises synthetic and/or natural and/or 10 regenerated fibres.
3. A belt according to either of the preceding claims, characterised in that the surface resistance at a voltage of 100 V is from 10 2 to 10 8 , preferably from 10 4 to 10 6 , ohm. 15
4. A belt according to any one of the preceding claims, characterised in that the conductive fibres are based on at least one metal or elemental carbon.
5. A belt according to any one of the preceding claims, characterised in that it comprises one or more high20 strength, low-stretch yarns, filaments, woven fabrics or laid fabrics composed of synthetic and/or natural and/or regenerated fibres.
6. A belt substantially as hereinbefore described with reference to the accompanying drawings.
IE170588A 1987-07-22 1988-06-08 Belt with non-woven fabric for driving a conveyor belt IE60892B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19873724328 DE3724328A1 (en) 1987-07-22 1987-07-22 TAPE WITH FLEECE FOR DRIVE AND DRIVE BELTS, TRANSPORT AND CONVEYOR BELTS

Publications (2)

Publication Number Publication Date
IE881705L IE881705L (en) 1989-01-22
IE60892B1 true IE60892B1 (en) 1994-08-24

Family

ID=6332154

Family Applications (1)

Application Number Title Priority Date Filing Date
IE170588A IE60892B1 (en) 1987-07-22 1988-06-08 Belt with non-woven fabric for driving a conveyor belt

Country Status (9)

Country Link
EP (1) EP0300176B1 (en)
AT (1) ATE71051T1 (en)
DE (2) DE3724328A1 (en)
DK (1) DK330988A (en)
ES (1) ES2028181T3 (en)
FI (1) FI86894C (en)
IE (1) IE60892B1 (en)
NO (1) NO882960L (en)
PT (1) PT87899B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4126117C2 (en) * 1991-04-08 1994-04-07 Lohmann Gmbh & Co Kg Strength members for conveyor belts
IT1313522B1 (en) * 1999-05-27 2002-07-24 Antonio Antoniazzi ELASTIC CONVEYOR BELT WITH CONDUCTIVE FIBERS FOR STATIC DIELECTRICITY DISCHARGE AND STACKING MACHINE WITH SAID CARPET.
US20070167292A1 (en) * 2006-01-19 2007-07-19 Kuo Hai P Endless belt for treadmill
EP1813316A1 (en) * 2006-01-31 2007-08-01 Hai-Pin Kuo Endless belt for exercise treadmill

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8334233U1 (en) * 1984-03-01 Continental Gummi-Werke Ag Power transmission belts
DE1750073A1 (en) * 1963-03-27 1971-01-07 John Bright & Brothers Ltd belt
DE2016403A1 (en) * 1970-04-07 1971-10-28 Gebhard & Co AG, 5600 Wuppertal Base fabric for needled carpet and felt
FR2181564B1 (en) * 1972-04-28 1974-07-26 Boinet Manuf Gle Caoutch
US3998986A (en) * 1975-02-03 1976-12-21 Uniroyal Inc. Conveyor belt of rubber reinforced with stitch-bonded web fabric
US4154335A (en) * 1977-11-04 1979-05-15 Albany International Corp. Conveyor belting and method of manufacture
GB1589467A (en) * 1977-12-02 1981-05-13 Bright & Bros Ltd John Reinfrorced conveyor belting
DE2826953A1 (en) * 1978-06-20 1980-01-10 Bayer Ag Stable antistatic air filter - comprises needled felt made of acrylonitrile! polymer fibres with metal conducting coating
FR2511637A1 (en) * 1981-08-24 1983-02-25 Albany Int Corp METHOD FOR MANUFACTURING A CONVEYOR BELT, AND BELT THEREFOR

Also Published As

Publication number Publication date
FI883011A0 (en) 1988-06-22
EP0300176B1 (en) 1992-01-02
DK330988D0 (en) 1988-06-16
PT87899A (en) 1989-06-30
EP0300176A3 (en) 1990-04-11
NO882960D0 (en) 1988-07-01
PT87899B (en) 1993-09-30
ES2028181T3 (en) 1992-07-01
FI86894C (en) 1992-10-26
FI883011A (en) 1989-01-23
DE3724328A1 (en) 1989-02-09
IE881705L (en) 1989-01-22
ATE71051T1 (en) 1992-01-15
DE3724328C2 (en) 1990-02-15
DK330988A (en) 1989-01-23
EP0300176A2 (en) 1989-01-25
DE3867348D1 (en) 1992-02-13
FI86894B (en) 1992-07-15
NO882960L (en) 1989-01-23

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