EP0413886B1 - High resistance synthetic fibre fabric, as well as bulk storage container and strap formed from this fabric - Google Patents

High resistance synthetic fibre fabric, as well as bulk storage container and strap formed from this fabric Download PDF

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Publication number
EP0413886B1
EP0413886B1 EP90101963A EP90101963A EP0413886B1 EP 0413886 B1 EP0413886 B1 EP 0413886B1 EP 90101963 A EP90101963 A EP 90101963A EP 90101963 A EP90101963 A EP 90101963A EP 0413886 B1 EP0413886 B1 EP 0413886B1
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EP
European Patent Office
Prior art keywords
electrically conductive
bulk container
container according
threads
fabric
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EP90101963A
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German (de)
French (fr)
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EP0413886A1 (en
Inventor
Egon Wurr
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Eurea Verpackungs GmbH and Co KG
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Eurea Verpackungs GmbH and Co KG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D88/00—Large containers
    • B65D88/16—Large containers flexible
    • B65D88/1612—Flexible intermediate bulk containers [FIBC]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D88/00—Large containers
    • B65D88/16—Large containers flexible
    • B65D88/1612—Flexible intermediate bulk containers [FIBC]
    • B65D88/165—Flexible intermediate bulk containers [FIBC] with electrically conductive properties
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D03D15/50—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the properties of the yarns or threads
    • D03D15/533—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the properties of the yarns or threads antistatic; electrically conductive

Definitions

  • the invention relates to a bulk container made of a woven carrier bag and carrier devices attached thereto, the carrier bag consisting of an electrically conductive fabric made of synthetic fibers or plastic threads, which has electrically non-conductive and electrically conductive threads.
  • a bulk container which consists of a woven carrier bag and loops attached to it.
  • a fabric is used, in which metal threads are worked into the fabric to dissipate the static charge.
  • fabrics from DE-B-1 928 330 which, in order to avoid electrostatic charging, consist of two different fiber materials, one of which passes through an electrically conductive carbon black and is dispersed through the entire fiber the other fiber material is non-conductive, ie free of soot.
  • no bulk container is mentioned as a product from the tissue.
  • a disadvantage of these fabrics is said to have reduced strength and extensibility because they contain threads in which the carbon black is dispersed throughout the fiber.
  • Conductive core-sheath threads are known from DE-A 2 700 436. They consist of a thermoplastic polymer and a finely divided material dispersed therein from the group consisting of colloidal graphite, conductive zinc oxide, copper (I) iodide and colloidal silver. However, these threads are intended for pile fabrics that contain nylon or polyester thread bundles as top yarns, i.e. for typical carpet fabrics.
  • a textile fabric is known from DE-U-7 906 321, which has additional yarns which are wound with conductive carbon fibers. These textile fabrics are used for parachutes, balloons, clothing for gliders and hang-gliders.
  • a knitted or woven cloth with antistatic properties is known from DE-A-2 528 189, which is used, for example, for filter bags or clothing can be.
  • carbon black or an electrolessly applied metal coating is applied to a substrate consisting of a chemical fiber. This type of coating leads to rapidly abrading layers, whereby the conductivity is impaired, so that the risk of sparking and explosion increases greatly in the case of static charging.
  • the invention has for its object to provide a bulk container from a woven carrier bag and attached supporting devices, which is highly resilient, which retains its conductivity even after many passes in which free-flowing bulk material is poured into the filling opening, and which in a simple manner can be produced.
  • the object is achieved in that the electrically conductive threads consist of a polyolefin, contain carbon black and / or graphite in dispersed form and are woven in both in the warp and in the weft.
  • the bulk goods container according to the invention is mechanically extremely resilient and permanently and reliably discharges static electricity.
  • the modulus of elasticity ⁇ of the electrically conductive threads is smaller than that of the rest of the thread material woven in warp and weft. This prevents the electrically conductive threads from tearing when the fabric is subjected to high mechanical stress.
  • the conductive threads are advantageously made of polypropylene. This material largely corresponds in terms of its usage and especially its stretching behavior to that of the manufacture of high strength fabrics used plastic threads.
  • the conductive threads are woven into the base fabric in the warp as well as in the weft direction. By weaving in the warp and weft directions and crossing the warp and weft threads, the base fabric is pulled through to a rectangular grid of electrically conductive threads, through which, with appropriate grounding, the static electricity generated when the bulk goods container is used is permanently dissipated. By weaving in the electrically conductive threads (with a measuring arrangement according to DIN 53 482) z. B. a discharge resistance of 107 - 108 ohms reached.
  • the electrically conductive threads are preferably monofilaments, but fibers, threads or multifilaments of a conductive polypropylene can also be used.
  • the use of electrically conductive threads with a titer of 1000-1500 dtex is preferred.
  • a compaction of the grid of electrically conductive threads is provided for the accumulation of crossing points of the warp and weft threads.
  • wrist straps or the like these are at least partially advantageously made of conductive material.
  • the carrier bag of the bulk goods container is provided with an inner bag.
  • this is made of a fabric that, by weaving in electrically conductive threads in the warp and weft directions, achieves a discharge resistance of around 107 ohms and is therefore able to discharge electrical charges via appropriate earthing and is harmless do.
  • an additional inner bag made of polyethylene is also useful for special applications. This is then made of a conductive polyethylene into which carbon black or graphite is dispersed.
  • a further increase in conductivity and thus safety can be achieved by making the connecting material such as sewing thread or the like, which connects the individual parts of a bulk goods container, conductive.
  • This inner sack is currently preferably made from a composite aluminum foil.
  • the inner bag can be produced according to the invention from an aluminum composite film, with a conductive surface also being provided on the inside and / or outside.
  • Such a film can also be used as a so-called intermediate bag.
  • the outer sack is made of conductive plastic fabric
  • the inner sack is made of conductive polyethylene and there is an aluminum composite film in between as a vapor barrier.
  • other intermediate materials e.g. B. cardboard or wood.
  • a synthetic fiber fabric is schematically shown, in which electrically conductive threads 2 are preferably woven from polypropylene at intervals of 10 cm or less.
  • electrically conductive threads 2 are preferably woven from polypropylene at intervals of 10 cm or less.
  • the use of the electrically conductive threads in the warp (3) and as a weft (4) ensures that the synthetic fiber fabric is interspersed with a grid of electrically conductive threads 2. In this way, an excellent dissipation capacity of the tissue for the discharge of static electricity is achieved.
  • FIG. 2 shows a bulk goods container 1 which consists of a carrying bag 5 with a carrying strap designed as transport loops 7, 7 ' consists.
  • the carrying bag 5 has a filler neck 8 in its lid area 10 and an outlet neck 9 in its bottom area 11.
  • the carrier bag 5 is made of a high-strength synthetic fiber fabric, in which electrically conductive threads 2 are woven in the warp and weft directions. These electrically conductive warp 3 and weft threads 4 consist of electrically weakly conductive polyolefins, preferably of polypropylene.
  • the synthetic fiber fabric is interspersed with a grid of intersecting, electrically conductive threads, via which, with appropriate grounding, the static electricity generated when using the bulk material containers, primarily when filling or emptying, can be derived.
  • this grid of electrically conductive threads 2 the distance between the individual threads is preferably less than 10 cm, but it can be varied depending on the required conductivity.
  • the body tissue is coated with a conductive film, which also has a transverse surface resistance or discharge resistance of 107 and 108.
  • the thickness of the coating is irrelevant.
  • the FIBC is made from the conductive body tissue described with an inner bag made of film, which achieves similarly good surface resistance values and dissipation resistance of 107 and 108.
  • the possibility of using a multilayer sack is not shown, in which the outer sack consists of conductive fabric and the inner sack consists of conductive or non-electrically chargeable polyethylene. It is also possible to produce the outer bag from conductive fabric with a conductive coating on the inside and / or outside. Finally, it is also possible to use a conductive intermediate bag, e.g. B. made of aluminum foil, between the outer and inner bag.
  • the above-described inner sack made of film can be a normal tube, but it can also have the shape of the outer container due to special assembly, with any filler and outlet spout incorporated. If used, the outer and inner bags must be grounded when filling and emptying.
  • the risers 7, 7 'shown consist of the synthetic thread fabric according to the invention.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Woven Fabrics (AREA)
  • Purses, Travelling Bags, Baskets, Or Suitcases (AREA)
  • Wrappers (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
  • Artificial Filaments (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Details Of Garments (AREA)
  • Belt Conveyors (AREA)
  • Load-Engaging Elements For Cranes (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Cereal-Derived Products (AREA)
  • Bag Frames (AREA)
  • Elimination Of Static Electricity (AREA)
  • Package Frames And Binding Bands (AREA)
  • Details Of Rigid Or Semi-Rigid Containers (AREA)

Abstract

The invention relates to a high-strength synthetic fiber fabric which contains electrically conductive threads in addition to electrically nonconducting threads. The electrically conductive threads contain electrically conductive carbon dispersed in them. The electrically conductive threads consist of a polyolefin and are incorporated both in the warp and in the filling of the fabric. The invention also relates to a bulk container and a strap which have been made from the synthetic fiber fabric according to the invention. The fabric and the objects manufactured therefrom have excellent mechanical strength and a reliable dissipation of static electricity.

Description

Die Erfindung betrifft einen Schüttgutbehälter aus einem gewebten Tragbeutel und daran befestigten Tragvorrichtungen, wobei der Tragbeutel aus einem elektrisch leitenden Gewebe aus Kunstfasern oder Kunststoffäden besteht, welches elektrisch nicht leitende und elektrisch leitende Fäden aufweist.The invention relates to a bulk container made of a woven carrier bag and carrier devices attached thereto, the carrier bag consisting of an electrically conductive fabric made of synthetic fibers or plastic threads, which has electrically non-conductive and electrically conductive threads.

Aus der GB-A-2 101 559 ist ein Schüttgutbehälter bekannt, der aus einem gewebten Tragbeutel und daran befestigten Schlaufen besteht. Um nun statischen Aufladungen beim Befüllen oder Entleeren vorzubeugen, wird ein Gewebe eingesetzt, in das zum Ableiten der statischen Aufladung in das Gewebe Metallfäden eingearbeitet sind.From GB-A-2 101 559 a bulk container is known which consists of a woven carrier bag and loops attached to it. In order to prevent static charges when filling or emptying, a fabric is used, in which metal threads are worked into the fabric to dissipate the static charge.

Nachteilig bei dieser Lösung ist es, daß diese Metallfäden nur als Kettfäden in das Gewebe eingearbeitet sind, was die Ableitfähigkeit insgesamt beeinträchtigt. Vor allem aber ist das Dehnverhalten der Metallfasern oder -fäden sehr abweichend von dem Dehnverhalten des übrigen Gewebes aus Kunstfasern. Dies führt leicht zum Bruch der Metallfäden und damit zu einer Unterbrechung der Ableitung. Durch solche Unterbrechungspunkte wird im Falle der statischen Aufladung die Gefahr der Funkenbildung und Explosion stark erhöht.A disadvantage of this solution is that these metal threads are only incorporated into the fabric as warp threads, which affects the overall conductivity. Above all, however, the stretching behavior of the metal fibers or threads is very different from the stretching behavior of the rest of the fabric made of synthetic fibers. This easily leads to the breakage of the metal threads and thus to an interruption of the lead. Such breakpoints greatly increase the risk of sparking and explosion in the event of static charging.

Weiterhin sind Gewebe aus der DE-B-1 928 330 bekannt, die zur Vermeidung einer elektrostatischen Aufladung aus zwei verschiedenen Fasermaterialien bestehen, von denen das eine Fasermaterial von einem durch die gesamte Faser dispergierten, elektrisch leitenden Ruß durchsetzt und das andere Fasermaterial nichtleitend, d.h. frei von Ruß, ist. In der Entgegenhaltung ist jedoch kein Schüttgutbehälter als Produkt aus dem Gewebe genannt.Furthermore, fabrics from DE-B-1 928 330 are known which, in order to avoid electrostatic charging, consist of two different fiber materials, one of which passes through an electrically conductive carbon black and is dispersed through the entire fiber the other fiber material is non-conductive, ie free of soot. In the document, however, no bulk container is mentioned as a product from the tissue.

Als Nachteil dieser Gewebe wird angegeben, daß sie eine verminderte Festigkeit und Dehnbarkeit besitzen, weil sie Fäden enthalten, bei denen der Ruß durch die gesamte Faser hindurch dispergiert ist.A disadvantage of these fabrics is said to have reduced strength and extensibility because they contain threads in which the carbon black is dispersed throughout the fiber.

Weiterhin sind ähnliche Gewebe aus der WO-A-8500556 bekannt, bei der Polyamide mit Kohlenstoff-Anreicherung (carbon-doped) verwendet werden. Als Beispiel für den Anwendungsbereich des Gewebes gemäß WO-A-8500556 ist angegeben, daß daraus Bekleidung, Abdecktücher, Filter u. dgl. hergestellt werden können. Es handelt sich demnach um Gewebe geringer Festigkeit, aus denen keine Schüttgutbehälter herstellbar sind.Furthermore, similar fabrics are known from WO-A-8500556, in which polyamides with carbon enrichment (carbon-doped) are used. As an example of the field of application of the fabric according to WO-A-8500556 it is stated that clothing, drapes, filters and the like. Like. Can be produced. It is therefore fabric of low strength, from which no bulk containers can be produced.

Leitfähige Kern-Mantel-Fäden sind aus der DE-A 2 700 436 bekannt. Sie bestehen aus einem thermoplastischen Polymerisat und einem darin dispergierten feinteiligen Material aus der aus kolloidalem Graphit, leitfähigem Zinkoxyd, Kupfer (I)-Jodid und kolloidalem Silber bestehenden Gruppe. Bestimmt sind diese Fäden allerdings für Florgewebe, die Nylon- oder Polyesterfadenbündel als Obergarne enthalten, also für typische Teppich-Gewebe.Conductive core-sheath threads are known from DE-A 2 700 436. They consist of a thermoplastic polymer and a finely divided material dispersed therein from the group consisting of colloidal graphite, conductive zinc oxide, copper (I) iodide and colloidal silver. However, these threads are intended for pile fabrics that contain nylon or polyester thread bundles as top yarns, i.e. for typical carpet fabrics.

Weiterhin ist aus der DE-U-7 906 321 ein textiles Flächengebilde bekannt, das Zusatzgarne aufweist, die mit leitfähigen Kohlefasern umsponnen sind. Eingesetzt werden diese textilen Flächengewebe für Fallschirme, Ballone, Bespannungen von Segelflugzeugen und Drachenfliegern.Furthermore, a textile fabric is known from DE-U-7 906 321, which has additional yarns which are wound with conductive carbon fibers. These textile fabrics are used for parachutes, balloons, clothing for gliders and hang-gliders.

Ein gewirktes oder gewebtes Tuch mit antistatischen Eigenschaften ist aus der DE-A-2 528 189 bekannt, das beispielsweise für Filtersäcke oder Kleidungsstücke verwendet werden kann. Hierbei wird auf ein Substrat, das aus einer chemischen Faser besteht, Ruß oder ein stromlos aufgebrachter Metallüberzug aufgebracht. Diese Art von Überzügen führt zu schnell abreibenden Schichten, wodurch die Leitfähigkeit beeinträchtigt wird, so daß im Falle der statischen Aufladung die Gefahr der Funkenbildung und Explosion sich stark erhöht.A knitted or woven cloth with antistatic properties is known from DE-A-2 528 189, which is used, for example, for filter bags or clothing can be. Here, carbon black or an electrolessly applied metal coating is applied to a substrate consisting of a chemical fiber. This type of coating leads to rapidly abrading layers, whereby the conductivity is impaired, so that the risk of sparking and explosion increases greatly in the case of static charging.

Demnach sind bekannte elektrostatische ableitende Gewebe nicht für die Herstellung von Schüttgutbehältern geeignet.Accordingly, known electrostatic dissipative fabrics are not suitable for the production of bulk containers.

Der Erfindung liegt die Aufgabe zugrunde, einen Schüttgutbehälter aus einem gewebten Tragbeutel und daran befestigten Tragvorrichtungen zu schaffen, der hoch belastbar ist, der sich auch nach vielen Gebrauchsdurchgängen, bei dem in die Einfüllöffnung rieselfähiges Schüttgut eingefüllt wird, seine Leitfähigkeit bewahrt und der in einfacher Weise herstellbar ist.The invention has for its object to provide a bulk container from a woven carrier bag and attached supporting devices, which is highly resilient, which retains its conductivity even after many passes in which free-flowing bulk material is poured into the filling opening, and which in a simple manner can be produced.

Erfindungsgemäß wird die Aufgabe dadurch gelöst, daß die elektrisch leitenden Fäden aus einem Polyolefin bestehen, Ruß und/oder Graphit eindispergiert enthalten und sowohl in der Kette als auch im Schuß eingewebt sind. Der erfindungsgemäße Schüttgutbehälter ist mechanisch außerordentlich belastbar und leitet dauerhaft und zuverlässig statische Elektrizität ab.According to the invention the object is achieved in that the electrically conductive threads consist of a polyolefin, contain carbon black and / or graphite in dispersed form and are woven in both in the warp and in the weft. The bulk goods container according to the invention is mechanically extremely resilient and permanently and reliably discharges static electricity.

Vorteilhaft ist, daß der Elastizitätsmodul ε der elektrisch leitenden Fäden kleiner ist als der des übrigen in Kette und Schuß verwebten Fadenmaterials. Hierdurch wird verhindert, daß die elektrisch leitenden Fäden bei hoher mechanischer Beanspruchung des Gewebes reißen.It is advantageous that the modulus of elasticity ε of the electrically conductive threads is smaller than that of the rest of the thread material woven in warp and weft. This prevents the electrically conductive threads from tearing when the fabric is subjected to high mechanical stress.

Die leitenden Fäden bestehen vorteilhaft aus Polypropylen. Dieses Material entspricht in seinem Gebrauchs- und besonders in seinem Dehnungsverhalten weitgehend dem für die Herstellung von hochfesten Geweben verwendeten Kunststoffäden. Die leitenden Fäden werden in Kett- wie auch in Schußrichtung in das Grundgewebe eingewebt. Durch das Verweben in Kett- und Schußrichtung und die Verkreuzung der Kett- und Schußfäden wird das Grundgewebe zu einem rechteckigen Gitternetz von elektrisch leitenden Fäden durchzogen, durch die bei entsprechender Erdung eine dauerhafte Ableitung der bei Gebrauch des Schüttgutbehälters entstehenden statischen Elektrizitöt erfolgt. Durch das Einweben der elektrisch leitenden Fäden wird (bei einer Meßanordnung nach DIN 53 482) z. B. ein Ableitungswiderstand von 10⁷ - 10⁸ Ohm erreicht.The conductive threads are advantageously made of polypropylene. This material largely corresponds in terms of its usage and especially its stretching behavior to that of the manufacture of high strength fabrics used plastic threads. The conductive threads are woven into the base fabric in the warp as well as in the weft direction. By weaving in the warp and weft directions and crossing the warp and weft threads, the base fabric is pulled through to a rectangular grid of electrically conductive threads, through which, with appropriate grounding, the static electricity generated when the bulk goods container is used is permanently dissipated. By weaving in the electrically conductive threads (with a measuring arrangement according to DIN 53 482) z. B. a discharge resistance of 10⁷ - 10⁸ ohms reached.

Die vorgenannten Werte können variiert werden. Auch niedrigere Werten werden erreicht. Hierzu ist es erforderlich, daß etwa jeder 10. - 80. Faden im Kett- wie auch in Schußrichtung ein elektrisch leitender Faden ist. Die Fadenabstände der einzelnen Fäden zueinander innerhalb des Gitternetzes können entsprechend den Anforderungen variiert werden, sie liegen jedoch vorzugsweise unter 2 cm. Neben einem Gitternetz von ca. 9 x 9 cm stellt ein Gitternetz von 4,5 - 5 x 4,5 - 5 cm eine Besonderheit dar, da die übliche Meßelektrode gemäß DIN 53 482 immer in Berührung mit einem Gitterfaden kommt.The above values can be varied. Lower values are also achieved. For this it is necessary that approximately every 10th - 80th thread in the warp as well as in the weft direction is an electrically conductive thread. The thread spacing of the individual threads to one another within the grid can be varied according to the requirements, but they are preferably less than 2 cm. In addition to a grid of approx. 9 x 9 cm, a grid of 4.5 - 5 x 4.5 - 5 cm is a special feature, since the usual measuring electrode according to DIN 53 482 always comes into contact with a grid thread.

Die elektrisch leitenden Fäden sind bevorzugt Monofilamente, es können jedoch auch Fasern, Fäden oder Multifilamente eines leitfähigen Polypropylens zur Anwendung gelangen. Bevorzugt wird die Verwendung von elektrisch leitenden Fäden mit einen Titer von 1000 - 1500 dtex.The electrically conductive threads are preferably monofilaments, but fibers, threads or multifilaments of a conductive polypropylene can also be used. The use of electrically conductive threads with a titer of 1000-1500 dtex is preferred.

In bestimmten Bereichen des Tragbeutels wie seinem Deckel- und seinem Kragenbereich sowie im Ein- und Auslaufbereich ist zur Anhäufung von Kreuzungspunkten der Kett- und Schußfäden eine Verdichtung des Gitternetzes aus elektrisch leitenden Fäden vorgesehen. Ebenso werden bei der Verwendung von Trageschlaufen oder ähnlichem diese wenigstens teilweise vorteilhaft aus leitfähigem Material hergestellt.In certain areas of the carrier bag, such as its lid and collar area and in the inlet and outlet area, a compaction of the grid of electrically conductive threads is provided for the accumulation of crossing points of the warp and weft threads. Likewise, when using wrist straps or the like these are at least partially advantageously made of conductive material.

In einer weiteren Ausgestaltungsform ist der Tragbeutel des Schüttgutbehälters mit einem Innensack versehen. Dieser ist wie die übrigen Herstellungsmaterialien des Schüttgutbehälters aus einem Gewebe hergestellt, das durch das Einweben von elektrisch leitenden Fäden in Kett- und Schußrichtung einen Ableitwiderstand von etwa 10⁷ Ohm erreicht und dadurch in der Lage ist, elektrische Aufladungen über eine entsprechende Erdung abzuleiten und unschädlich zu machen.In a further embodiment, the carrier bag of the bulk goods container is provided with an inner bag. Like the other manufacturing materials for the bulk goods container, this is made of a fabric that, by weaving in electrically conductive threads in the warp and weft directions, achieves a discharge resistance of around 10⁷ ohms and is therefore able to discharge electrical charges via appropriate earthing and is harmless do.

Da für viele Einsatzfälle ein beschichteter Schüttgutbehälter verlangt wird, der auch mit einer besonderen Nahtabdichtung versehen sein kann, besteht auch die Möglichkeit, das ableitfähige Körpergewebe mit einer leitfähigen Beschichtung aus Polypropylen oder Polyäthylen zu versehen, d. h. nicht nur eine solche Beschichtung für den Deckel, den Einlauf und/oder Auslauf vorzusehen.Since a coated bulk container is required for many applications, which can also be provided with a special seam seal, there is also the possibility of providing the conductive body tissue with a conductive coating made of polypropylene or polyethylene, i. H. not only to provide such a coating for the lid, the inlet and / or outlet.

Neben der Herstellung von Schüttgutbehältern aus innen und außen leitfähigem Gewebe mit entsprechender Beschichtung ist für spezielle Anwendungsgebiete auch ein zusätzlicher Innensack aus Polyäthylen sinnvoll. Dieser wird dann aus einem leitfähigen Polyäthylen hergestellt, in das Ruß oder Graphit eindispergiert ist.In addition to the production of bulk containers from inside and outside conductive fabric with the appropriate coating, an additional inner bag made of polyethylene is also useful for special applications. This is then made of a conductive polyethylene into which carbon black or graphite is dispersed.

Eine weitere Erhöhung der Leitfähigkeit und damit der Sicherheit kann dadurch erzielt werden, daß auch das Verbindungsmaterial wie Nähgarn oder ähnliches, das die Einzelteile eines Schüttgutbehälters miteinander verbindet, leitfähig gemacht wird.A further increase in conductivity and thus safety can be achieved by making the connecting material such as sewing thread or the like, which connects the individual parts of a bulk goods container, conductive.

Sonderkonstruktionen von Schüttgutbehältern erfordern eine Wasserdampfsperre für den Innensack. Dieser Innensack wird zur Zeit vorzugsweise aus einer Aluminiumverbundfolie hergestellt. Davon abweichend kann erfindungsgemäß der Innensack aus einer Aluminiumverbundfolie hergestellt werden, wobei ebenfalls eine leitfähige Oberfläche innen und/oder außen gegeben ist. Eine solche Folie kann auch als sogenannter Zwischensack eingesetzt werden. Bei der Zwischensackkonstruktion ist der Außensack aus leitfähigem Kunststoffgewebe, der Innensack aus leitfähigem Polyäthylen und dazwischen befindet sich als Dampfsperre eine Aluminiumverbundfolie. Für andere Einsatzgebiete können auch andere Zwischenmaterialien, z. B. Pappe oder Holz, zum Einsatz kommen.Special constructions of bulk goods containers require a water vapor barrier for the inner bag. This inner sack is currently preferably made from a composite aluminum foil. Deviating from this, the inner bag can be produced according to the invention from an aluminum composite film, with a conductive surface also being provided on the inside and / or outside. Such a film can also be used as a so-called intermediate bag. In the intermediate sack construction, the outer sack is made of conductive plastic fabric, the inner sack is made of conductive polyethylene and there is an aluminum composite film in between as a vapor barrier. For other areas of application, other intermediate materials, e.g. B. cardboard or wood.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben. Es zeigen:

Fig. 1
die Gewebestruktur für einen Schüttgutbehälter,
Fig. 2
einen erfindungsgemäßen Schüttgutbehälter mit daran befestigten Tragschlaufen in perspektivischer Darstellung.
An embodiment of the invention is shown in the drawing and will be described in more detail below. Show it:
Fig. 1
the fabric structure for a bulk container,
Fig. 2
a bulk container according to the invention with attached loops in a perspective view.

In Fig. 1 ist schematisch ein Kunstfaser-Gewebe dargestellt, in das in Abständen von 10 cm oder weniger elektrisch leitende Fäden 2 aus vorzugsweise Polypropylen eingewoben sind. Durch den Einsatz der elektrisch leitenden Fäden im Kett- (3) und als Schußfaden-Verband (4) wird erreicht, daß das Kunstfaser-Gewebe mit einem Gitternetz von elektrisch leitenden Fäden 2 durchsetzt ist. Hierdurch wird eine ausgezeichnete Ableitfähigkeit des Gewebes für das Ableiten statischer Elektrizität erreicht.In Fig. 1, a synthetic fiber fabric is schematically shown, in which electrically conductive threads 2 are preferably woven from polypropylene at intervals of 10 cm or less. The use of the electrically conductive threads in the warp (3) and as a weft (4) ensures that the synthetic fiber fabric is interspersed with a grid of electrically conductive threads 2. In this way, an excellent dissipation capacity of the tissue for the discharge of static electricity is achieved.

Das in Fig. 2 dargestellte Ausführungsbeispiel zeigt einen Schüttgutbehälter 1, der aus einem Tragbeutel 5 mit als Transportschlaufen 7, 7' ausgebildeten Tragegurt besteht. In seinem Deckelbereich 10 weist der Tragbeutel 5 einen Einfüllstutzen 8, in seinem Bodenbereich 11 einen Auslaufstutzen 9 auf. Der Tragbeutel 5 ist aus einem hochfesten Kunstfaser-Gewebe hergestellt, bei dem in Kett- und Schußrichtung elektrisch leitende Fäden 2 eingewoben sind. Diese elektrisch leitenden Kett- 3 und Schußfäden 4 bestehen aus elektrisch schwach leitenden Polyolefinen, vorzugsweise aus Polypropylen. Durch das Einweben in Kett- und Schußrichtung wird das Kunstfasergewebe mit einem Gitternetz sich kreuzender, elektrisch leitender Fäden durchsetzt, über das bei entsprechender Erdung die beim Benutzen der Schüttgutbehälter, vornehmlich beim Einfüllen bzw. Entleeren, entstehende statische Elektrizität abgeleitet werden kann. In diesem Gitternetz aus elektrisch leitenden Fäden 2 beträgt der Abstand der einzelnen Fäden zueinander vorzugsweise unter 10 cm, er kann jedoch je nach erforderlicher Leitfähigkeit variiert werden.The exemplary embodiment shown in FIG. 2 shows a bulk goods container 1 which consists of a carrying bag 5 with a carrying strap designed as transport loops 7, 7 ' consists. The carrying bag 5 has a filler neck 8 in its lid area 10 and an outlet neck 9 in its bottom area 11. The carrier bag 5 is made of a high-strength synthetic fiber fabric, in which electrically conductive threads 2 are woven in the warp and weft directions. These electrically conductive warp 3 and weft threads 4 consist of electrically weakly conductive polyolefins, preferably of polypropylene. By weaving in the warp and weft directions, the synthetic fiber fabric is interspersed with a grid of intersecting, electrically conductive threads, via which, with appropriate grounding, the static electricity generated when using the bulk material containers, primarily when filling or emptying, can be derived. In this grid of electrically conductive threads 2, the distance between the individual threads is preferably less than 10 cm, but it can be varied depending on the required conductivity.

Im Kragenbereich 6, im Deckelbereich 10 sowie im Bereich des Einfüll- 8 und Auslaufstutzens 9 kann - wie hier geschehen ist - zur Optimierung des Ableitverhaltens eine Verdichtung des Gitternetzes aus elektrisch leitenden Fäden 2 vorgesehen werden. Ebenso ist in das Material für die Trageschlaufen 7, 7' zur Gewährleistung der Ableitung leitfähiges Material eingearbeitet.In the collar area 6, in the lid area 10 and in the area of the filler 8 and outlet 9, a compression of the grid of electrically conductive threads 2 can be provided - as has been done here - to optimize the discharge behavior. Likewise, conductive material is incorporated into the material for the carrying straps 7, 7 'to ensure the discharge.

Wichtig für die Sicherheit ist die lückenlose Erdung während der Befüllung und Entleerung, damit mögliche statische Aufladungen abgeleitet werden.It is important for safety that the earthing is complete during filling and emptying, so that possible static charges are discharged.

Abweichend von der vorbeschriebenen Ausführungsform ist es auch möglich, das Körpergewebe oder das Gewebe eines vorhandenen Innensackes zu beschichten. Da im allgemeinen eine Beschichtung nicht besonders gut leitfähig ist, kommt der Leitfähigkeit des dahinterliegenden Gewebes eine besondere Bedeutung zu.Deviating from the embodiment described above, it is also possible to coat the body tissue or the tissue of an existing inner bag. Since a coating is generally not particularly conductive, the conductivity of the tissue behind it is of particular importance.

Eine weitere Ausgestaltungsform ist, daß das Körpergewebe mit einer leitfähigen Folie beschichtet ist, die ebenfalls einen Querflächenwiderstandswert bzw. Ableitwiderstand von 10⁷ und 10⁸ aufweist. Dabei spielt die Stärke der Beschichtung keine Rolle.Another embodiment is that the body tissue is coated with a conductive film, which also has a transverse surface resistance or discharge resistance of 10⁷ and 10⁸. The thickness of the coating is irrelevant.

Als weitere Ausgestaltungsform ist vorgesehen, den FIBC aus dem beschriebenen leitfähigen Körpergewebe mit einem Innensack aus Folie herzustellen, die ähnlich gute Oberflächenwiderstandswerte und Ableitungswiderstand von 10⁷ und 10⁸ erreicht. Nicht dargestellt ist die Möglichkeit, einen mehrschichtigen Sack zu verwenden, bei dem der Außensack aus leitfähigem Gewebe besteht und der Innensack aus leitfähigem oder nicht elektrisch aufladbaren Polyäthylen besteht. Es ist auch möglich, den Außensack aus leitfähigem Gewebe mit einer ableitfähigen Beschichtung innen und/oder außen herzustellen. Schließlich ist auch noch möglich, einen ableitfähigen Zwischensack, z. B. aus Aluminiumfolie, zwischen Außen- und Innensack einzubauen.As a further embodiment, the FIBC is made from the conductive body tissue described with an inner bag made of film, which achieves similarly good surface resistance values and dissipation resistance of 10⁷ and 10⁸. The possibility of using a multilayer sack is not shown, in which the outer sack consists of conductive fabric and the inner sack consists of conductive or non-electrically chargeable polyethylene. It is also possible to produce the outer bag from conductive fabric with a conductive coating on the inside and / or outside. Finally, it is also possible to use a conductive intermediate bag, e.g. B. made of aluminum foil, between the outer and inner bag.

Der vorbeschriebene Innensack aus Folie kann ein normaler Schlauch sein, aber auch durch besondere Konfektion die Form des Außenbehälters haben, mit eventuellem eingearbeiteten Einfüll- und Auslaufstutzen. Im Falle der Verwendung müssen beim Befüllen und Entleeren Außen- und Innensack geerdet werden.The above-described inner sack made of film can be a normal tube, but it can also have the shape of the outer container due to special assembly, with any filler and outlet spout incorporated. If used, the outer and inner bags must be grounded when filling and emptying.

Die dargestellten Tragegurte 7, 7' bestehen aus dem erfindungsgemäßen Kunstfaden-Gewebe. Ein derartiger Tragegurt 7, 7' kann selbstverständlich auch einzeln oder in einer anderen Formgebung hergestellt sein.The risers 7, 7 'shown consist of the synthetic thread fabric according to the invention. Such a carrying strap 7, 7 'can of course also be made individually or in another shape.

Claims (13)

  1. A bulk container consisting of a woven carrying bag and carrying means attached thereto, the carrying bag (5) consisting of an electrically conductive fabric made of synthetic fibres or plastics threads which has electrically non-conductive and electrically conductive threads (2), characterised in that the electrically conductive threads (2) are made of a polyolefin, contain soot and/or graphite dispersed therein, and are woven in both in the warp (3) and in the weft (4).
  2. A bulk container according to Claim 1, characterised in that the elasticity modulus ε of the electrically conductive threads (2) is smaller than that of the rest of the thread material woven in the warp (3) and weft (4).
  3. A bulk container according to Claim 1 or 2, characterized in that the electrically conductive threads (2) in the parent substance are made of polypropylene.
  4. A bulk container according to one of Claims 1 to 3, characterised in that every tenth to eightieth warp thread (3) or weft thread (4) is an electrically conductive thread.
  5. A bulk container according to one of Claims 1 to 4, characterized in that the spacing of the electrically conductive threads relative to one another in the warp direction and in the weft direction is not greater than 10 cm, preferably not greater than 2 cm.
  6. A bulk container according to one of Claims 1 to 5, characterised in that the electrically conductive threads (2) are monofilaments.
  7. A bulk container according to one of Claims 1 to 6, characterised in that the electrically conductive threads (2) have a titre of 1000 to 1500 dtex.
  8. A bulk container according to one of the preceding Claims, characterised in that the bulk container has in its cover region (10) and collar region (6) an increased number of electrically conductive threads (2) compared with the rest of the fabric of the carrying bag (5).
  9. A bulk container according to one of the preceding Claims, characterised in that carrying loops (7, 7') are provided as carrying means, which loops are made at least partially of conductive fabric or conductive threads (2).
  10. A bulk container according to one of the preceding Claims, characterised in that a filler neck (8) and an outlet connection (9) provided on the carrying bag (5) are made electrically conductive.
  11. A bulk container according to one of the preceding Claims, consisting of an inner and outer bag, characterised in that the inner bag and/or the outer bag is made of conductive fabric.
  12. A bulk container according to Claim 11, characterised in that the outer bag is made of conductive material and the inner bag is made of conductive or non-electrically chargeable polyethylene.
  13. A bulk container according to Claim 11 or 12, characterised in that an intermediate bag, for instance made of aluminium foil, is inserted between the earthing inner and outer bags.
EP90101963A 1989-08-19 1990-02-01 High resistance synthetic fibre fabric, as well as bulk storage container and strap formed from this fabric Expired - Lifetime EP0413886B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE8909967U 1989-08-19
DE8909967 1989-08-19
DE3938414A DE3938414C2 (en) 1989-08-19 1989-11-18 Bulk goods container made of a woven carrier bag and carrier devices attached to it
DE3938414 1989-11-18

Publications (2)

Publication Number Publication Date
EP0413886A1 EP0413886A1 (en) 1991-02-27
EP0413886B1 true EP0413886B1 (en) 1995-01-04

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EP90101963A Expired - Lifetime EP0413886B1 (en) 1989-08-19 1990-02-01 High resistance synthetic fibre fabric, as well as bulk storage container and strap formed from this fabric

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US (1) US5092683A (en)
EP (1) EP0413886B1 (en)
JP (1) JPH03152238A (en)
AT (1) ATE116698T1 (en)
AU (1) AU637129B2 (en)
BG (1) BG60298B2 (en)
CA (1) CA2023643A1 (en)
CZ (1) CZ284229B6 (en)
DE (2) DE3938414C2 (en)
DK (1) DK0413886T3 (en)
ES (1) ES2068927T3 (en)
FI (1) FI96937C (en)
GR (1) GR3015446T3 (en)
HU (1) HU209935B (en)
NO (1) NO903610L (en)
TR (1) TR25430A (en)

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Also Published As

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CZ284229B6 (en) 1998-09-16
EP0413886A1 (en) 1991-02-27
CS9003981A2 (en) 1991-11-12
AU6092990A (en) 1991-02-21
TR25430A (en) 1993-03-01
HU905060D0 (en) 1991-01-28
ATE116698T1 (en) 1995-01-15
CA2023643A1 (en) 1991-02-20
GR3015446T3 (en) 1995-06-30
DE3938414C2 (en) 1994-04-14
DE3938414A1 (en) 1991-02-21
BG60298B2 (en) 1994-04-25
DK0413886T3 (en) 1995-06-19
FI904073A0 (en) 1990-08-17
HUT59970A (en) 1992-07-28
HU209935B (en) 1994-12-28
DE59008179D1 (en) 1995-02-16
ES2068927T3 (en) 1995-05-01
AU637129B2 (en) 1993-05-20
NO903610D0 (en) 1990-08-16
JPH03152238A (en) 1991-06-28
US5092683A (en) 1992-03-03
FI96937C (en) 1996-09-25
NO903610L (en) 1991-02-20
FI96937B (en) 1996-06-14

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