EP0914257B1 - Verfahren zur laserbeschriftung von folien - Google Patents
Verfahren zur laserbeschriftung von folien Download PDFInfo
- Publication number
- EP0914257B1 EP0914257B1 EP97934462A EP97934462A EP0914257B1 EP 0914257 B1 EP0914257 B1 EP 0914257B1 EP 97934462 A EP97934462 A EP 97934462A EP 97934462 A EP97934462 A EP 97934462A EP 0914257 B1 EP0914257 B1 EP 0914257B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- laser
- film
- layer
- additive
- covering layer
- 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
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
- B41M5/267—Marking of plastic artifacts, e.g. with laser
Definitions
- the invention relates to a method for laser marking of colored or uncolored films with at least one Top layer and a base layer.
- thermoplastics especially the However, it has been polyolefins, polystyrene and polyamides difficult, a laser marking with sufficient sharpness, Legibility and good contrast.
- the labeling of foils is very difficult because here when using laser radiation with high energies an undesirable charring of the film occurs, which up to Destruction of the film in the irradiated areas can.
- thermoplastic molding compositions with laser-sensitive pigmentation the additive 0.001 contain up to 0.199% by weight of copper (II) hydroxide phosphate.
- Polyolefins are also used as thermoplastics.
- Laser marking is carried out using a neodymium-YAG solid-state laser with a wavelength of 1060 nm. A black was obtained on molded articles made of polypropylene Labeling.
- EP-B1 0 190 997 describes a method for laser marking pigmented colored polyolefins.
- Plastics such as polyethylene and polypropylene initially with inorganic or organic pigments or polymer-soluble Colored dyes, these colorants preferably in absorb near UV and / or visible or near IR range.
- these thermoplastic molding compounds labeled with laser radiation the laser light a Wavelength in the UV range (0.25 and 0.38 ⁇ m) and / or in visible range and / or in the IR range (0.78 and 2 ⁇ m).
- the process uses black inscriptions for polyolefins generated.
- EP-A1 0 111 357 describes a method for laser marking molded articles made of polyolefins by irradiation with a TEA-CO 2 laser.
- the intensity of the laser pulse is 333 kW / cm 2 .
- the polyolefin contains calcium metasilicate, aluminum silicate or kaolin as an additive. The procedure produces black lettering.
- “Kunstscher 79 (1989), 11” is a method for laser marking known from polyolefin films, which is a black Marking results.
- the polyolefins are used as additives about 0.1% by weight of a mica pigment, which is added under the name Iriodin® (manufacturer: Merck, Darmstadt) is commercially available.
- the flat mica flakes become with a thin layer of a metal oxide with a high refractive index coated.
- the pigment platelets are in the plastic oriented parallel to the surface. Strikes a laser beam on the pigment platelets, so part of the light is transferred to the Pigments reflect, the rest of it transmits. By the geometry of the platelets are the incident and the reflective light beam close together so that in the area of the laser light beam the available energy density raised and a surface layer of the plastic is carbonized. This results in a high contrast black Mark.
- DE 195 25 958.0 proposes a process for producing laser-inscribed films, the films consisting of a polyolefin and containing 0.2 to 10% by weight of an additive.
- a silicate or silicon dioxide with a particle size of 0.01 to 100 ⁇ m is used as an additive.
- the films produced in this way are then irradiated with laser radiation with an energy density of 1 to 10 J / cm 2 . With this process, high-contrast white or light gray lettering is achieved.
- DE 195 25 958.0 corresponds to the unpublished EP 0 754 562, which therefore belongs to the state of the art according to Art. 54 (3) EPC for the present application.
- the smooth surface of the film is used for laser marking disadvantageously changed, and numerous changes result from these changes Disadvantages for the use of the foils.
- the packaging sector continues to exist the great disadvantage that bacteria can also be found in this rough surface layer May nest, which is particularly undesirable in food packaging are.
- a lettering on an open rough surface is by no means is wear-resistant, but can be worn away over time.
- the technical problem of the invention was therefore a method for laser marking to develop films that have the disadvantages described above do not occur and in particular the surface layer of the film is not changed or being roughened.
- a method for laser marking of colored or uncolored films with at least one top layer and one Carrier layer the film being irradiated with laser radiation through the cover layer is and the cover layer is chosen so that it the laser radiation used is not absorbed and the backing layer is laser-inscribable and wherein the carrier layer consists of a polyolefin and 0.05 to 10% by weight of one Additive selected from the group consisting of silicates and silicon dioxide with a Particle size from 0.01 to 100 microns.
- Multi-layer films are made from State of the art known. They can be different depending on the purpose equipped and manufactured by coextrusion.
- the cover layer consists of polymers or Copolymers of polyethylene, polypropylene, polybutene-1, polyisobutylene, Poly-4-methylpentene-1, polyacetylene or polyamide.
- the additive for the base layer selected from the group silicon dioxide in crystalline or amorphous Form, mica, feldspar, calcined kaolin, kaolin, nepheline syenite, talc, Calcium silicate hydrate, silica, pyrogenic or precipitated silica, cristobalite, Diatomaceous earth, diatomaceous earth, micro-glass balls or mixtures thereof.
- Excimer lasers have wavelengths in the UV range from 193 to 351 nm, for example 196, 248, 308 and 351 nm.
- Neodymium YAG lasers are used in the visible and in the near IR range, for example at wavelengths of 532 and 1064 nm.
- Another laser that emits in the infrared range is the CO 2 laser. This laser emits, for example, in the far IR range at wavelengths of 10,600 nm or 9,300 nm.
- the use of pulsed lasers with pulse durations of 1 to 1000 ns is particularly preferred.
- the energy densities used are preferably between 1 and 20 J / cm 2 .
- Inorganic colors are preferably used for coloring the film or organic pigments or polymer-soluble dyes used.
- the additive for the base layer can continue can be used as a masterbatch in a mixture with polyolefin.
- a CO 2 laser at wavelengths of 10,600 or 9,300 nm is preferably used for laser marking.
- the foils can be irradiated with an energy density of 1 to 10 J / cm 2 , preferably 1 to 7 J / cm 2 .
- Figure 1 shows a SEM image of the cross section of a brittle fracture a multilayer film which according to the invention Process was made.
- FIG. 2 shows an SEM image of a brittle fracture Laser-labeled film of the prior art in supervision.
- FIG. 3 shows an SEM image of the cross section of a Brittle fracture of a laser-inscribed film from the state of the Technology.
- Preferred polyolefins for the carrier layer are those used, which are derived from alkenes with 2 to 10 carbon atoms. Homopolymers or copolymers of ethylene are preferred, Propylene or butylene used. Polyethylenes can be made are made according to the high, medium or low pressure process. Copolymers of ethylene with phenyl esters, Acrylic esters or with propylene can be used. In High density polyethylene is particularly preferred or linear low density polyethylene. It Polyethylenes can also be used, the usual Contain fillers, stabilizers, antiblocking agents.
- polypropylene which can be produced, for example, by the gas phase process using Ziegler-Natta catalysts.
- copolymers of propylene can be mentioned that 10 -alk-1-enes for example, consist of propylene homopolymer and polypropylene copolymer with polymerized C 2 to C.
- Ethylene, butene-1, pentene-1, hexene-1 or octene-1 or mixtures thereof are used, for example, as copolymerized C 2 to C 10 -alkenes.
- Ethylene and butene-1 are preferred.
- propylene copolymers are produced by Polymerization using Ziegler-Natta catalysts, preferably in the gas phase with those customary in the art Polymerization reactors.
- Ziegler-Natta catalysts preferably in the gas phase with those customary in the art Polymerization reactors.
- procedures for Manufacture of polyolefins are known and are described in "Ullmanns Encyclopedia of Technical Chemistry ", 4th edition, volume 19, Pages 167 to 226.
- the polyolefin suitable for laser marking can still be used Contain usual additives or pigments.
- inorganic pigments that cause discoloration are white pigments, such as titanium oxide, zinc oxide, antimony trioxide, Zinc sulfide, lithopone, basic lead carbonate, basic Lead sulfate or basic lead silicate, also metal oxide, such as Iron oxides, chromium oxides, nickel antimony titanate, chromium antimony titanate, Manganese blue, manganese violet, cobalt blue, cobalt chrome blue, Cobalt nickel gray or ultramarine blue, Berlin blue, Lead chromates, lead sulfochromates, molybdate orange, molybdate red, Metal sulfides such as cadmium sulfide, arsenic disulfide, antimony trisulfide or cadmium sulfoselenide, zirconium silicates such as zirconium vanadium blue and zirconium prase
- organic pigments examples include azo, azomethine, methine, Anthraquinone, indanthrone, pyranthrone, flavone throne, Benzanthrone, phthalocyanine, perylene, dioxazine, thioindigo, Isoindoline, isoindolinone, quinacridone, pyrrolopyrrole or quinophthalene pigments and metal complexes of azo, azomethine or methine dyes or metal salts of azo compounds.
- the polyolefins can also contain fillers, such as kaolin, mica, feldspar, wollastonite, aluminum silicate, Barium sulfate, calcium sulfate, chalk, calcite and dolomite. Furthermore, light stabilizers, antioxidants, flame retardants, Heat stabilizers, glass fibers or processing agents, which is common when processing plastics are used.
- fillers such as kaolin, mica, feldspar, wollastonite, aluminum silicate, Barium sulfate, calcium sulfate, chalk, calcite and dolomite.
- light stabilizers, antioxidants, flame retardants, Heat stabilizers, glass fibers or processing agents which is common when processing plastics are used.
- the polyolefin for the backing layer can also be used as Concentrate (masterbatch) can be produced. Then it owns correspondingly higher additions of the aggregate according to the invention, the ranges from 20 to 80% by weight. This masterbatch is then generated before of films mixed with a polyolefin so that the necessary concentrations of the aggregate from 0.05 to 10% by weight can be achieved in the total amount.
- the energy radiation of the laser used is preferably in the range of a wavelength in the far IR.
- the energy radiation of the laser used is preferably at a wavelength of 9,300 or 10,600 nm.
- a laser with pulsed light is particularly preferably used, with an energy density of 1 to 10 J / cm 2 , preferably 2.5 to 8 J / cm 2 , is irradiated.
- the polymer material according to the invention is preferably irradiated via an optical system comprising a mirror, mask and lens.
- the method according to the invention has the advantage that when irradiated through the top layer of the multilayer film through no change in the The surface of the laser-inscribed film comes with it Disadvantages of the prior art methods mentioned at the beginning Technology can be completely avoided.
- Processed labels are significant more wear-resistant and can also be used for packaging can be used in the food sector as it does this the surface of the foils is not roughened.
- the inscriptions obtained are also high-contrast, sharp-edged, abrasion and solvent resistant.
- the use for the labeling method according to the invention is intended for polyolefin film packaging, in particular for food packaging, e.g. foils, used for meat packaging.
- Laser marking processes can for example also on running filling lines in the filling cycle e.g. Packing data, Print expiration dates, barcodes and other data.
- Foils can be over-colored with colorants, whereby the color intensity can be easily graduated by adding the colorant is.
- Figure 1 shows a SEM image of the cross section of a brittle fracture a multilayer film which according to the invention Process was made. On the recording is too recognize that the surfaces of the film are unchanged and only in the middle part, where the laser-inscribable Base layer is located, a foaming can be seen.
- FIG. 2 shows an SEM image of a brittle fracture Laser-labeled film of the prior art in supervision.
- FIG. 3 shows an SEM image of a brittle fracture the same film of the prior art in cross section.
- there is on the surface of the Layer comes to frothing and roughening, so that Dirt particles or bacteria penetrate the film surface can.
- a single-layer film made of polyethylene (Escorene® LD-100 BW was produced on a film casting machine from Leistritz, Nuremberg.
- cristobalite flour in the form of a masterbatch (50% filling degree) was homogeneously distributed in the film.
- the lettering was carried out with a CO 2 laser, type Almark AL 861K from Alltech GmbH & Co KG, Lübeck, at a wavelength of 9300 nm.
- Energy densities of 3.5 J / cm 2 resulted in clear white inscriptions 2 and 3, the writing being recognizable as an open-pore foam structure on the film surface, the surface being foamed and rough.
- a film with at least three layers was produced from polyethylene (Escorene® LD-100 BW) on a multi-layer film casting machine from Leistritz, Nuremberg.
- the film was constructed as follows: top and bottom cover layers each 20 ⁇ m thick without additive; in the middle layer, also 20 ⁇ m thick, 2% cristobalite flour in the form of a masterbatch (50% filling degree) was homogeneously distributed as an additive.
- the inscription was carried out using the CO 2 laser according to Comparative Example 1. The energy density of 3.5 J / cm 2 gave clear inscriptions.
- the SEM image of the film cross section is shown in FIG. 1. The position of the lettering as a foam structure in the middle layer can be seen. The other two layers, especially the surface of the foils, were not foamed and not rough.
- a film was produced as in Example 1.
- In the middle layer was a laser-sensitive additive of 0.5% surface-treated mica (Iriodin 100® from the company Merck, Darmstadt). It was labeled as in Comparative Example 1.
- the typeface is in the middle Layer was created without foaming the surface.
Description
Claims (8)
- Verfahren zur Laserbeschriftung von gefärbten oder ungefärbten Folien mit mindestens einer Deckschicht und einer Trägerschicht, wobei die Folie durch die Deckschicht mit Laserstrahlung bestrahlt wird, wobei die Deckschicht so gewählt wird, daß sie die verwendete Laserstrahlung nicht absorbiert und die Trägerschicht laserbeschriftbar ausgerüstet ist und wobei die Trägerschicht aus einem Polyolefin und 0,05 bis 10 Gew% eines Zusatzstoffes ausgewählt aus der Gruppe Silikate und Siliciumdioxid mit einer Teilchengröße von 0,01 bis 100 µm besteht.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Deckschicht aus Polymerisaten oder Copolymerisaten des Polyethylens, Polypropylens, Polybuten-1, Polyisobutylen, Poly-4-Methylpenten-1, Polyacetylen oder Polyamid besteht.
- Verfahren nach den Ansprüchen 1 oder 2, dadurch gekennzeichnet, daß der Zusatzstoff ausgewählt ist aus der Gruppe Siliciumdioxid in kristalliner oder amorpher Form, Glimmer, Feldspat, calcinierter Kaolin, Kaolin, Nephelinsyenit, Talkum, Calciumsilicathydrat, Kieselsäure, pyrogene oder gefällte Kieselsäure, Cristobalit, Diatomeenerde, Kieselgur, Mikro-Glaskugeln oder Gemische derselben.
- Verfahren nach den Ansprüchen 1 bis 3, dadurch gekennzeichnet, daß zur Laserbestrahlung ein Excimer-Laser, Neodym-YAG-Laser oder CO2-Laser eingesetzt wird.
- Verfahren nach den Ansprüchen 1 bis 4, dadurch gekennzeichnet, daß zur Färbung der Folie anorganische oder organische Pigmente oder polymerlösliche Farbstoffe eingesetzt werden.
- Verfahren nach den Ansprüchen 1 bis 5, dadurch gekennzeichnet, daß der Zusatzstoff für die Trägerschicht im Gemisch mit Polyolefin als Masterbatch eingesetzt wird.
- Verfahren nach den Ansprüchen 1 bis 6, dadurch gekennzeichnet, daß die Folien mit einer Energiedichte von 1 bis 10 J/cm2 bestrahlt werden.
- Verfahren nach den Ansprüchen 1 bis 7, dadurch gekennzeichnet, daß die Energiestrahlung des Lasers eine Wellenlänge von 10.600 nm oder 9.300 nm besitzt.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19630478A DE19630478A1 (de) | 1996-07-27 | 1996-07-27 | Verfahren zur Laserbeschriftung von Folien |
DE19630478 | 1996-07-27 | ||
PCT/EP1997/003757 WO1998004417A1 (de) | 1996-07-27 | 1997-07-14 | Verfahren zur laserbeschriftung von folien |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0914257A1 EP0914257A1 (de) | 1999-05-12 |
EP0914257B1 true EP0914257B1 (de) | 2001-11-07 |
Family
ID=7801117
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97934462A Expired - Lifetime EP0914257B1 (de) | 1996-07-27 | 1997-07-14 | Verfahren zur laserbeschriftung von folien |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0914257B1 (de) |
JP (1) | JP2000501670A (de) |
AT (1) | ATE208280T1 (de) |
DE (2) | DE19630478A1 (de) |
ES (1) | ES2167763T3 (de) |
WO (1) | WO1998004417A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE202006013892U1 (de) * | 2006-09-05 | 2008-01-10 | Herma Gmbh | Haftverbund |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2341579B (en) | 1998-09-16 | 2003-04-16 | Agra Vadeko Inc | Apparatus and method of marking polymer-based laminates |
DE19918473C2 (de) | 1999-04-23 | 2003-10-02 | Lohmann Therapie Syst Lts | Verfahren und Vorrichtung zum Beschriften eines flächigen klebenden Systems aus einem dünnwandigen Polymer, in Form eines wirkstoffhaltigen Pflasters, insbesondere eines transdermalen therapeutischen Systems |
ES2208403T3 (es) * | 1999-08-21 | 2004-06-16 | DEUTSCHE ROCKWOOL MINERALWOLL GMBH & CO. OHG | Procedimiento para la fabricacion de un material aislante. |
DE29925014U1 (de) * | 1999-12-13 | 2008-12-18 | Knauf Insulation Gmbh | Identifizierbares Mineralfaserprodukt |
DE10003423A1 (de) * | 2000-01-26 | 2001-08-02 | Hoechst Trespaphan Gmbh | Verpackung aus biaxial orientierter Polyolefinfolie |
DE10053639B4 (de) * | 2000-10-28 | 2007-04-12 | Chemische Fabrik Budenheim Kg | Verwendung von Eisen-, Cobalt-, Nickel- oder Molybdänsalzen |
WO2002068192A1 (de) * | 2001-02-26 | 2002-09-06 | Trespaphan Gmbh | Lasermarkierbares laminat |
DE10142638A1 (de) | 2001-08-31 | 2003-05-08 | Tesa Ag | Verfahren zum Herstellen einer laserbeschriftbaren Folie |
DE10213110A1 (de) * | 2002-03-23 | 2003-10-02 | Tesa Ag | Mehrschichtige Laser-Transferfolie zum dauerhaften Beschriften von Bauteilen |
DE10235018A1 (de) * | 2002-07-31 | 2004-02-12 | Merck Patent Gmbh | Lasermarkierbare flexible Trägereinheit |
EP1732767A1 (de) * | 2004-03-30 | 2006-12-20 | MERCK PATENT GmbH | Versiegelung von kunststoffbeschriftungen |
DE102004063136A1 (de) * | 2004-12-22 | 2006-07-13 | Kalle Gmbh | Mehrschichtige markierbare Nahrungsmittelhülle |
DE102008008016A1 (de) * | 2008-02-07 | 2009-08-20 | Raumedic Ag | Kunststoffkörper |
DE102010008706A1 (de) † | 2010-02-19 | 2010-11-04 | Nordenia Technologies Gmbh | Folie, insbesondere für Aufreißverpackungen und Verfahren zur Herstellung einer Beutelverpackung unter Verwendung der Folie |
JP6562145B1 (ja) * | 2018-11-13 | 2019-08-21 | 東洋インキScホールディングス株式会社 | 紫外線レーザーマーキング組成物、それを用いた印刷物および積層体 |
KR20220119075A (ko) * | 2019-12-20 | 2022-08-26 | 도요보 가부시키가이샤 | 레이저 인자 가능한 필름 및 그것을 사용한 포장체 |
WO2021125136A1 (ja) * | 2019-12-20 | 2021-06-24 | 東洋紡株式会社 | レーザー印字可能なフィルムおよびそれを用いた包装体 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0754562A2 (de) * | 1995-07-17 | 1997-01-22 | Quarzwerke GmbH | Polyolefin zur Laserbeschriftung, laserbeschriftete Formkörper und Folien und Verfahren zu ihrer Herstellung |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
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US4500777A (en) * | 1981-02-27 | 1985-02-19 | Drexler Technology Corporation | High data capacity, scratch and dust resistant, infrared, read-write data card for automatic teller machines |
NL8204604A (nl) * | 1982-11-26 | 1984-06-18 | Wavin Bv | Kunststofmateriaal. |
AU597240B2 (en) * | 1985-02-05 | 1990-05-31 | Ciba-Geigy Ag | Laser marking of pigmented systems |
GB8726482D0 (en) * | 1987-11-12 | 1987-12-16 | Bicc Plc | Marking flourocarbon surfaces |
GB8802054D0 (en) * | 1988-01-29 | 1988-02-24 | Baugh J J | Method of marking object using laser beam & method & device for use in reading bar code |
ES2086389T3 (es) * | 1989-09-22 | 1996-07-01 | Schneider Electric Sa | Procedimiento, dispositivo y pintura de marcado por laser para cascadas de aparatos electricos. |
US5340628A (en) * | 1992-11-05 | 1994-08-23 | Ccl Label, Inc. | Laser markable laminated sheet |
EP0607597B1 (de) * | 1993-01-19 | 1999-03-03 | Nippon Kayaku Kabushiki Kaisha | Markierungszusammensetzung, deren Herstellung und Markierungsverfahren |
BE1008127A3 (nl) * | 1994-03-09 | 1996-01-23 | Dsm Nv | Voorwerp dat een ingebrande markering bevat en een werkwijze voor de vervaardiging van het voorwerp. |
TW363016B (en) * | 1996-01-08 | 1999-07-01 | Nippon Kayaku Kk | Laser marking article having two or more layers of thin films on the surface thereof, method for laser marking of the article and ground composition for use in laser marking |
-
1996
- 1996-07-27 DE DE19630478A patent/DE19630478A1/de not_active Withdrawn
-
1997
- 1997-07-14 DE DE59705289T patent/DE59705289D1/de not_active Expired - Fee Related
- 1997-07-14 WO PCT/EP1997/003757 patent/WO1998004417A1/de active IP Right Grant
- 1997-07-14 JP JP10508438A patent/JP2000501670A/ja active Pending
- 1997-07-14 ES ES97934462T patent/ES2167763T3/es not_active Expired - Lifetime
- 1997-07-14 AT AT97934462T patent/ATE208280T1/de not_active IP Right Cessation
- 1997-07-14 EP EP97934462A patent/EP0914257B1/de not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0754562A2 (de) * | 1995-07-17 | 1997-01-22 | Quarzwerke GmbH | Polyolefin zur Laserbeschriftung, laserbeschriftete Formkörper und Folien und Verfahren zu ihrer Herstellung |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE202006013892U1 (de) * | 2006-09-05 | 2008-01-10 | Herma Gmbh | Haftverbund |
Also Published As
Publication number | Publication date |
---|---|
DE19630478A1 (de) | 1998-01-29 |
WO1998004417A1 (de) | 1998-02-05 |
ES2167763T3 (es) | 2002-05-16 |
JP2000501670A (ja) | 2000-02-15 |
DE59705289D1 (de) | 2001-12-13 |
EP0914257A1 (de) | 1999-05-12 |
ATE208280T1 (de) | 2001-11-15 |
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