EP0091007A2 - Abrasive band with woven supporting member, and method of manufacturing the same - Google Patents

Abrasive band with woven supporting member, and method of manufacturing the same Download PDF

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Publication number
EP0091007A2
EP0091007A2 EP83102872A EP83102872A EP0091007A2 EP 0091007 A2 EP0091007 A2 EP 0091007A2 EP 83102872 A EP83102872 A EP 83102872A EP 83102872 A EP83102872 A EP 83102872A EP 0091007 A2 EP0091007 A2 EP 0091007A2
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EP
European Patent Office
Prior art keywords
matrix
abrasive
fibers
segments
false twist
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.)
Granted
Application number
EP83102872A
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German (de)
French (fr)
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EP0091007A3 (en
EP0091007B1 (en
Inventor
Eberhard Dr. Dipl.-Chem. Kratzsch
Wolfgang Cygan
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.)
Akzo Patente Te Wuppertal Bondsrepubliek Dui GmbH
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Akzo GmbH
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Publication date
Application filed by Akzo GmbH filed Critical Akzo GmbH
Priority to AT83102872T priority Critical patent/ATE19484T1/en
Publication of EP0091007A2 publication Critical patent/EP0091007A2/en
Publication of EP0091007A3 publication Critical patent/EP0091007A3/en
Application granted granted Critical
Publication of EP0091007B1 publication Critical patent/EP0091007B1/en
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D11/00—Constructional features of flexible abrasive materials; Special features in the manufacture of such materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
    • B24D3/001—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as supporting member
    • B24D3/002—Flexible supporting members, e.g. paper, woven, plastic materials
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G1/00—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics
    • D02G1/02—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics by twisting, fixing the twist and backtwisting, i.e. by imparting false twist
    • D02G1/0286—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics by twisting, fixing the twist and backtwisting, i.e. by imparting false twist characterised by the use of certain filaments, fibres or yarns

Definitions

  • abrasive web with a woven backing made of synthetic fibers.
  • abrasive web is understood to mean bound abrasives according to "Ullmanns Encyclopedia of Technical Chemistry, Vol. 20, pp. 449 ff".
  • polyester abrasives of this type are characterized, among other things, by low water absorption and are therefore particularly suitable for wet grinding. They also have high strength, both tear and tear resistance, which enables a long service life.
  • a critical point of such abrasives can be the adhesion between the backing material and the binder.
  • DE-OS 25 31 602 it is therefore recommended not to manufacture the carrier material from filament yarn, but from fiber yarn, despite the greater strength.
  • the object of the present invention is to provide an abrasive with a woven backing material made of synthetic filament yarns, which is not inferior to a backing material made from fiber yarns with regard to the adhesion between the binder and the backing material. This task also includes its manufacture.
  • the carrier material made of filament yarn consists of fully or partially split multicomponent fibers of the matrix segment type.
  • multi-component fibers of the matrix segment type are to be understood as fibers which are composed of at least two different components which are essentially incompatible with one another, for example polyester and polyamide.
  • the matrix is the component in which the segments are more or less embedded. It can happen that the matrix completely envelops the segments or that the segments are only partially surrounded by the matrix. Both the matrix and the segments are arranged continuously with a substantially constant cross section over the entire length of the fiber.
  • Multi-component fibers of the matrix segment type which have at least three peripheral segments are preferably used in the context of the invention, at least some of the peripheral segments not being encased by the matrix, that is to say making up part of the edge of the cross section.
  • Cross sections according to FIGS. 1 to 4 have peripheral segments with rounded surface parts, whereas cross sections, as shown in FIG. 6, have, in addition to a rounded part at the edge of the cross section, also substantially straight parts of the surface.
  • Cross sections according to FIG. 6 are also referred to as an orange profile.
  • the cross section shown in Figure 6 is also called the six-member.
  • Cross sections according to Figures 1 to 4 are also referred to as so-called gear profiles, with Figures 2 to 4 being so-called six-gear profiles.
  • FIG. 3 also has an additional central segment, in FIG. 4 there are three further segments completely encased by the matrix.
  • FIG. 7 An asymmetrical and uneven arrangement of segments and the matrix is shown in FIG. 7.
  • the matrix consists of polyamide and the peripheral segments of polyester.
  • FIG. 8 shows cross sections of split filaments. The individual segments are completely separate.
  • Figure 9 are cross section of filaments shown that are only partially split.
  • the fully or partially split filament yarn is woven, finished and further processed into abrasives using known methods.
  • FIG. 10 shows a schematic cross section through the abrasive: a) is the abrasive grain, b) the binder and c) the woven backing material.
  • a preferred embodiment of the invention is the elastically bound abrasive. It is preferably used in the form of endless flexible abrasive belts. But it can also be used in the form of rolls, sheets and strips. It will be explained in more detail by the following examples:
  • the abrasive produced in this way showed, after grinding samples in the next higher grain area, a much better adhesion between the carrier material and the binder when visually assessed than a comparison abrasive made of textured polyethylene terephthalate (diols) of the same titer (400 dtex).
  • the grain, including the coating, was broken out less frequently.
  • the abrasive according to the invention even withstood a comparison in this regard with an abrasive made from polyester fiber yarn.
  • Example 1 was repeated with the exception that the total titer was now 200 dtex. The results were practically the same.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Woven Fabrics (AREA)
  • Multicomponent Fibers (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)

Abstract

1. A web-form abrasive material comprising a woven substrate of synthetic fibers, characterized by completely or partly split filament yarns of multicomponent fibers of the matrix-segment type.

Description

Die Erfindung geht aus einer Schleifmittelbahn mit einem gewebten Trägermaterial aus synthetischen Fasern hervor. Unter Schleifmittelbahn im Sinne der Erfindung werden gebundene Schleifmittel nach "Ullmanns Encyclopädie der techn. Chemie, Bd. 20, S. 449 ff" verstanden.The invention arises from an abrasive web with a woven backing made of synthetic fibers. In the context of the invention, abrasive web is understood to mean bound abrasives according to "Ullmanns Encyclopedia of Technical Chemistry, Vol. 20, pp. 449 ff".

Derartige Schleifmittel aus Polyester zeichnen sich gegenüber Schleifmittel aus Baumwolle unter anderem durch geringe Wasseraufnahme aus und sind daher besonders gut für den Naßschliff geeignet. Außerdem haben sie eine hohe Festigkeit, sowohl EinreiB- als auch Weiterreiß-Festigkeit, was eine lange Gebrauchszeit ermöglicht. Ein kritischer Punkt derartiger Schleifmittel kann dagegen die Haftung zwischen Trägermaterial und Bindemittel sein. In der DE-OS 25 31 602 wird daher empfohlen, das Trägermaterial trotz der größeren Festigkeit nicht aus Filamentgarn, sondern aus Fasergarn herzustellen. Aufgabe der vorliegenden Erfindung ist es, ein Schleifmittel mit einem gewebten Trägermaterial aus synthetischen Filamentgarnen zur Verfügung zu stellen, das bezüglich der Haftung zwischen Bindemittel und Trägermaterial einem aus Fasergarnen hergestellten Trägermaterial nicht nachsteht. Diese Aufgabe beinhaltet auch seine Herstellung.Compared to cotton abrasives, polyester abrasives of this type are characterized, among other things, by low water absorption and are therefore particularly suitable for wet grinding. They also have high strength, both tear and tear resistance, which enables a long service life. In contrast, a critical point of such abrasives can be the adhesion between the backing material and the binder. In DE-OS 25 31 602 it is therefore recommended not to manufacture the carrier material from filament yarn, but from fiber yarn, despite the greater strength. The object of the present invention is to provide an abrasive with a woven backing material made of synthetic filament yarns, which is not inferior to a backing material made from fiber yarns with regard to the adhesion between the binder and the backing material. This task also includes its manufacture.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daB das Trägermaterial aus Filamentgarn aus ganz oder teilweise gespaltenen Mehrkomponentenfasern des Matrix-Segmenttyps besteht. Unter Mehrkomponentenfasern des Matrix-Segmenttyps sind im Rahmen der Erfindung Fasern zu verstehen, die aus mindestens zwei verschiedenen Komponenten aufgebaut sind, die im wesentlichen miteinander unverträglich sind, beispielsweise Polyester und Polyamid. Unter der Matrix ist die Komponente zu verstehen, in welche die Segmente mehr oder weniger eingelagert sind. Dabei kann es vorkommen, daß die Matrix die Segmente völlig umhüllt oder die Segmente von der Matrix nur zu einem Teil umgeben sind. Sowohl die Matrix als auch die Segmente sind mit im wesentlichen gleichbleibendem Querschnitt über die gesamte Länge der Faser durchgehend angeordnet. Vorzugsweise werden im Rahmen der Erfindung Mehrkomponentenfasern des Matrix-Segmenttyps eingesetzt, die mindestens drei periphere Segmente aufweisen, wobei mindestens ein Teil der peripheren Segmente nicht von der Matrix umhüllt ist, also einen Teil des Randes des Querschnitts ausmachen.This object is achieved according to the invention in that the carrier material made of filament yarn consists of fully or partially split multicomponent fibers of the matrix segment type. In the context of the invention, multi-component fibers of the matrix segment type are to be understood as fibers which are composed of at least two different components which are essentially incompatible with one another, for example polyester and polyamide. The matrix is the component in which the segments are more or less embedded. It can happen that the matrix completely envelops the segments or that the segments are only partially surrounded by the matrix. Both the matrix and the segments are arranged continuously with a substantially constant cross section over the entire length of the fiber. Multi-component fibers of the matrix segment type which have at least three peripheral segments are preferably used in the context of the invention, at least some of the peripheral segments not being encased by the matrix, that is to say making up part of the edge of the cross section.

Querschnitte von Mehrkomponentenfasern des Matrix-Segmenttyps wie sie im Rahmen der Erfindung zum Einsatz gelangen können, werden z.B. in der deutschen Offenlegungsschrift 2 809 346 beschrieben. Sie sind in den Figuren 1 bis 7 schematisch dargestellt. Dabei stellen b die sogenannten Segmente dar und a die Matrix. Die Segmente sind in die Matrix eingelagert und werden von dieser teilweise oder - wie es bei einigen Segmenten in den Figuren 3, 4 und 5 der Fall ist, ganz umhüllt.Cross-sections of multi-component fibers of the matrix segment type, as can be used in the context of the invention, are described, for example, in German Offenlegungsschrift 2 809 346. They are shown schematically in Figures 1 to 7. B represents the so-called segments and a the matrix. The segments are embedded in the matrix and are partially or - as it - by it is the case for some segments in Figures 3, 4 and 5, completely enveloped.

Querschnitte gemäß den Figuren 1 bis 4 weisen periphere Segmente mit abgerundeten Oberflächenteilen auf, wogegen Querschnitte, wie sie in Figur 6 wiedergegeben werden, neben einem abgerundeten Teil am Rand des Querschnitts auch im wesentlichen gradlinig verlaufende Teile der Oberfläche besitzen. Querschnitte nach Figur 6 werden auch als Orangenprofil bezeichnet. Der in Figur 6 dargestellte Querschnitt wird auch Sechserorgan genannt. Querschnitte gemäß den Figuren 1 bis 4 bezeichnet man auch als sogenannte Zahnradprofile, wobei die Figuren 2 bis 4 sogenannte Sechserzahnradprofile sind. Die Figur 3 weist noch ein zusätzliches zentrales Segment auf, in Figur 4 sind drei weitere von der Matrix völlig umhüllte Segmente vorhanden.Cross sections according to FIGS. 1 to 4 have peripheral segments with rounded surface parts, whereas cross sections, as shown in FIG. 6, have, in addition to a rounded part at the edge of the cross section, also substantially straight parts of the surface. Cross sections according to FIG. 6 are also referred to as an orange profile. The cross section shown in Figure 6 is also called the six-member. Cross sections according to Figures 1 to 4 are also referred to as so-called gear profiles, with Figures 2 to 4 being so-called six-gear profiles. FIG. 3 also has an additional central segment, in FIG. 4 there are three further segments completely encased by the matrix.

Eine unsymmetrische und ungleichmäßige Anordnung von Segmenten und der Matrix ist in Figur 7 wiedergegeben.An asymmetrical and uneven arrangement of segments and the matrix is shown in FIG. 7.

Es ist vorteilhaft, wenn die Matrix aus Polyamid und die peripheren Segmente aus Polyester bestehen.It is advantageous if the matrix consists of polyamide and the peripheral segments of polyester.

Es ist vorteilhaft, das Filamentgarn zunächst ganz oder teilweise in reine Komponenten zu spalten, dann zu weben und anschließend zum Schleifmittel auszurüsten.It is advantageous to first split all or part of the filament yarn into pure components, then to weave and then to finish it with the abrasive.

Ein Verfahren, mit dem sich die Mehrkomponentenfasern des Matrix-Segmenttyps vorteilhaft ganz oder teilweise wieder in Segment- und Matrix-Komponenten spalten lassen, wird in der DE-OS 29 08 101 beschrieben. Sehr geeignet sind also nach dem Falschdrallverfahren texturierte und während des FaJschdrallens bei einer Temperatur von etwa 180 bis 230°C fixierte Garne. In Figur 8 sind Querschnitte von gespaltenen Filamenten dargestellt. Die einzelnen Segmente sind völlig getrennt. In Abbildung 9 sind Querschnitt von Filamenten dargestellt, die nur teilweise gespalten sind.A method with which the multicomponent fibers of the matrix segment type can advantageously be completely or partially split again into segment and matrix components is described in DE-OS 29 08 101. Yarns textured using the false twist method and fixed during the twist twist at a temperature of about 180 to 230 ° C. are very suitable. FIG. 8 shows cross sections of split filaments. The individual segments are completely separate. In Figure 9 are cross section of filaments shown that are only partially split.

Das ganz oder teilweise gespaltene Filamentgarn wird nach an sich bekannten Verfahren gewebt, ausgerüstet und zu Schleifmitteln weiter verarbeitet.The fully or partially split filament yarn is woven, finished and further processed into abrasives using known methods.

Figur 10 zeigt einen schematischen Querschnitt durch das Schleifmittel: a) ist das Schleifkorn, b) das Bindemittel und c) das gewebte Trägermaterial.FIG. 10 shows a schematic cross section through the abrasive: a) is the abrasive grain, b) the binder and c) the woven backing material.

Eine bevorzugte Ausführungsform der Erfindung ist das elastisch gebundene Schleifmittel. Es wird bevorzugt in Form von endlosen flexiblen Schleifmittelbändern eingesetzt. Aber auch seine Anwendung in Form von Rollen, Bögen und Streifen ist möglich. Es soll durch die folgenden Beispiele näher erläutert werden:A preferred embodiment of the invention is the elastically bound abrasive. It is preferably used in the form of endless flexible abrasive belts. But it can also be used in the form of rolls, sheets and strips. It will be explained in more detail by the following examples:

Beispiel 1:Example 1:

Ein Bikomponentengarn auf der Basis von Polyester/Polyamid (Gewichtsverhältnis: 85 / 15) mit den Segmenten aus Polyäthylenterephthalat und der Matrix aus Polyamid 6 (Anordnung gemäß Figur 6) wurde wie in DE-OS 29 08 101 angegeben, texturiert. Das Garn (Titer 400 dtex) wurde in an sich bekannter Weise gewebt (Bindung: Satin 4/1), ausgerüstet und gemäß DE-AS 29 28 484 zu Schleifmitteln verarbeitet.A bicomponent yarn based on polyester / polyamide (weight ratio: 85/15) with the segments made of polyethylene terephthalate and the matrix made of polyamide 6 (arrangement according to FIG. 6) was textured as indicated in DE-OS 29 08 101. The yarn (titer 400 dtex) was woven in a manner known per se (binding: satin 4/1), finished and processed into abrasives in accordance with DE-AS 29 28 484.

Das so hergestellte Schleifmittel zeigte nach Schleifproben im nächsthöheren Kornbereich bei visueller Beurteilung eine wesentlich bessere Haftung zwischen Trägermaterial und Bindemittel als ein Vergleichs-Schleifmittel aus texturiertem Polyäthylenterephthalat (Diolen) des gleichen Titers (400 dtex). Es wurde die Körnung inklusive Beschichtung weit weniger häufig herausgebrochen. Das erfindungsgemäße Schleifmittel hielt sogar einem diesbezüglichen Vergleich mit einem aus Polyester-Fasergarn hergestellten Schleifmittel stand.The abrasive produced in this way showed, after grinding samples in the next higher grain area, a much better adhesion between the carrier material and the binder when visually assessed than a comparison abrasive made of textured polyethylene terephthalate (diols) of the same titer (400 dtex). The grain, including the coating, was broken out less frequently. The abrasive according to the invention even withstood a comparison in this regard with an abrasive made from polyester fiber yarn.

Beispiel 2:Example 2:

Es wurde das Beispiel 1 wiederholt mit der Ausnahme, daß der Gesamttiter nun 200 dtex betrug. Die Ergebnisse waren praktisch gleich.Example 1 was repeated with the exception that the total titer was now 200 dtex. The results were practically the same.

Claims (6)

1. Schleifmittelbahn mit einem gewebten Trägermaterial aus synthetischen Fasern, gekennzeichnet durch ganz oder teilweise gespaltene Filamentgarne aus Mehrkomponentenfasern des Matrix-Segmenttyps.1. Abrasive web with a woven backing made of synthetic fibers, characterized by fully or partially split filament yarns made of multi-component fibers of the matrix segment type. 2. Schleifmittelbahn nach Anspruch 1, gekennzeichnet durch Mehrkomponentenfasern mit einer Polyamid-Matrix und peripheren Polyester-Segmenten.2. Abrasive web according to claim 1, characterized by multi-component fibers with a polyamide matrix and peripheral polyester segments. 3. Schleifmittelbahn nach Anspruch 1 oder 2, gekennzeichnet durch nach dem Falschdrallverfahren texturierte und während des Falschdrallens bei einer Temperatur von etwa 180 bis 230°C fixierte Garne.3. Abrasive web according to claim 1 or 2, characterized by textured by the false twist method and fixed during the false twist at a temperature of about 180 to 230 ° C yarns. 4. Verfahren zur Herstellung einer Schleifmittelbahn nach den Ansprüchen 1 - 3, dadurch gekennzeichnet, daß man von einem Filamentgarn aus Mehrkomponentenfasern des Matrix-Segmenttyps ausgeht, es ganz oder teilweise in seine Komponenten spaltet, es webt und dann auf bekannte Weise zum Schleifmittel ausrüstet.4. A process for producing an abrasive web according to claims 1-3, characterized in that one starts from a filament yarn made of multi-component fibers of the matrix segment type, splits it wholly or partly into its components, weaves it and then equips it in a known manner to form the abrasive. 5. Verfahren nach Anspruch 4, gekennzeichnet durch Mehrkomponentenfasern mit einer Polyamid-Matrix und peripheren Polyester-Segmenten.5. The method according to claim 4, characterized by multi-component fibers with a polyamide matrix and peripheral polyester segments. 6. Verfahren nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß man die Mehrkomponentenfasern nach dem Falschdrallverfahren texturiert und während des Falschdrallens bei einer Temperatur von etwa 180 bis 230 °C fixiert.6. The method according to claim 4 or 5, characterized in that the multicomponent fibers are textured by the false twist method and fixed during the false twist at a temperature of about 180 to 230 ° C.
EP83102872A 1982-04-06 1983-03-23 Abrasive band with woven supporting member, and method of manufacturing the same Expired EP0091007B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83102872T ATE19484T1 (en) 1982-04-06 1983-03-23 ABRASIVE CENTER PATH WITH A WOVEN BACKING MATERIAL AND ITS MANUFACTURE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3212805 1982-04-06
DE19823212805 DE3212805A1 (en) 1982-04-06 1982-04-06 ABRASIVE MATERIAL WITH A WOVEN SUPPORT MATERIAL

Publications (3)

Publication Number Publication Date
EP0091007A2 true EP0091007A2 (en) 1983-10-12
EP0091007A3 EP0091007A3 (en) 1985-01-16
EP0091007B1 EP0091007B1 (en) 1986-04-30

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EP83102872A Expired EP0091007B1 (en) 1982-04-06 1983-03-23 Abrasive band with woven supporting member, and method of manufacturing the same

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AT (1) ATE19484T1 (en)
DE (1) DE3212805A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3339911A1 (en) * 1983-11-04 1985-05-23 Akzo Gmbh, 5600 Wuppertal USE OF BLOW JET TEXTURED YARNS IN THE MANUFACTURE OF UNDERLAY ABRASIVES

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1502602A1 (en) * 1962-10-25 1969-05-29 Carborundum Co Abrasive cloth
DE2531642A1 (en) * 1974-07-24 1976-02-05 Norton Co POLYESTER FABRIC AS A BASE FOR SANDING LINEN
DE2809346A1 (en) * 1978-03-03 1979-09-06 Akzo Gmbh Fibrous structures prodn. from multicomponent fibres by treatment with organic solvent to effect differential shrinkage
DE2908101A1 (en) * 1979-03-02 1980-09-11 Akzo Gmbh MULTIFILER THREAD MADE OF SINGLE FILAMENTS OF THE MULTI-COMPONENT MATRIX SEGMENT TYPE
DE2928484B1 (en) * 1979-07-14 1980-10-16 Ver Schmirgel & Maschf Process for the production of flexible abrasives
EP0045408A1 (en) * 1980-07-31 1982-02-10 Norton Company Flexible coated abrasive sheet material

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1502602A1 (en) * 1962-10-25 1969-05-29 Carborundum Co Abrasive cloth
DE2531642A1 (en) * 1974-07-24 1976-02-05 Norton Co POLYESTER FABRIC AS A BASE FOR SANDING LINEN
DE2809346A1 (en) * 1978-03-03 1979-09-06 Akzo Gmbh Fibrous structures prodn. from multicomponent fibres by treatment with organic solvent to effect differential shrinkage
DE2908101A1 (en) * 1979-03-02 1980-09-11 Akzo Gmbh MULTIFILER THREAD MADE OF SINGLE FILAMENTS OF THE MULTI-COMPONENT MATRIX SEGMENT TYPE
DE2928484B1 (en) * 1979-07-14 1980-10-16 Ver Schmirgel & Maschf Process for the production of flexible abrasives
EP0045408A1 (en) * 1980-07-31 1982-02-10 Norton Company Flexible coated abrasive sheet material

Also Published As

Publication number Publication date
EP0091007A3 (en) 1985-01-16
DE3212805C2 (en) 1987-04-02
EP0091007B1 (en) 1986-04-30
DE3212805A1 (en) 1983-12-15
ATE19484T1 (en) 1986-05-15

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