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WO1996029709A1 - Matieres filamenteuses conductrices - Google Patents

Matieres filamenteuses conductrices Download PDF

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Publication number
WO1996029709A1
WO1996029709A1 PCT/GB1996/000698 GB9600698W WO9629709A1 WO 1996029709 A1 WO1996029709 A1 WO 1996029709A1 GB 9600698 W GB9600698 W GB 9600698W WO 9629709 A1 WO9629709 A1 WO 9629709A1
Authority
WO
WIPO (PCT)
Prior art keywords
conductive
tape
fabric
layers
conductive layer
Prior art date
Application number
PCT/GB1996/000698
Other languages
English (en)
Inventor
David Donald Phin
Original Assignee
Scott & Fyfe Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GBGB9505855.8A external-priority patent/GB9505855D0/en
Priority claimed from GBGB9513704.8A external-priority patent/GB9513704D0/en
Application filed by Scott & Fyfe Limited filed Critical Scott & Fyfe Limited
Publication of WO1996029709A1 publication Critical patent/WO1996029709A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B5/00—Non-insulated conductors or conductive bodies characterised by their form
    • H01B5/14—Non-insulated conductors or conductive bodies characterised by their form comprising conductive layers or films on insulating-supports

Definitions

  • This invention relates to electrically conductive filamentary material in the form of tapes, to a method of manufacturing such materials, and to a fabric incorporating such material.
  • Conductive filamentary materials are used for example in industrial fabrics for reducing the effects of static electricity. Conductive fibre or filamentary materials are described for example in GB patent 1417394 and, as applied to a fabric used in intermediate bulk containers (IBC's), in EP-B-0413886.
  • the present invention provides a conductive filamentary material in the form of a tape, which tape comprises, when seen in section, a laminate of at least three co-extruded layers: an inner non-conductive layer and outer conductive layers lying either side of the inner layer.
  • the inner, non- conductive layer may itself comprise a laminate of multiple layers of non-conductive materials to give particular desired properties.
  • the as-cast tape is drawn under heat to provide the required strength and other characteristics according to the particular circumstances of use. A typical drawing range might be 3:1 to 10:1, possibly up to 20:1. Heat is applied during the drawing process to develop the strength, extension and other physical properties required and of an order sufficient to retain conductivity.
  • the non-conductive layer is preferably made from a thermoplastics material such as a polymer or copolymer, or blends thereof; the conductive layers are preferably made from a thermoplastics material, as above, compounded with a particulate conductive material such as carbon black or aluminium flake. A typical compound might contain 30% by weight of carbon black.
  • the conductive layers may be made from an inherently conductive plastics material.
  • the non-conductive layer forms at least 50% by weight of the total composition of the tape. This ensures that the non- conductive component largely controls the physical properties of the tape and enables, for example, the drawing operation to be carried out reliably up to quite high draw ratios without breakage.
  • the three (or more) layers making up the tape are coextruded so as to form a composite multilayer product.
  • a preferred method of manufacture is to initially form a relatively wide web or film of the composite multilayer material and thence to slit this into tapes by means of knives.
  • the film starts out typically about 600 mm wide and is slit into tapes typically about 4.7 mm wide and with a tex typically of 720 (tex is the weight in grams per 1000 metres).
  • These tapes are now drawn under the influence of heat to the desired draw ratio, typically in the range 3:1 to 10:1.
  • the tape may have thin (e.g. 5-10 microns) non-conductive skins on one or both sides to reduce surface particulate migration, but not so thick as to influence the mechanism for dissipating static electricity.
  • the drawing shows a cross-section of an elongate filamentary material of tape-like appearance and made up of three layers: a central core layer 1 made of polypropylene and surface layers 2,3 made of a 30% by weight carbon black loaded conductive polypropylene compound.
  • the ratio of the core layer to the surface layers is 75:25 by weight in the examples tested (see below), but other ratios are possible; preferably, however, the core layer comprises at least 50% by weight.
  • the tape Prior to drawing, the tape is 4.7 mm wide, but typical widths might lie in the range 2 to 20 mm.
  • the material is typically 0.2 mm thick.
  • the filamentary material shown in the drawing is manufactured by co-extruding a wide (typically 600 mm) film comprising a core layer of polypropylene homo polymer and surface layers of 30% carbon black loaded conductive polypropylene. The co-extruded film is then slit into tapes by means of knives. These undrawn tapes so formed are 4.7 mm wide and have a nominal tex of 720 but ranges from 606 to 870 (tex is the weight in grams per 1000 metres).
  • the as-cast tapes are now drawn, under heat, to the desired draw ratio.
  • the attached table 1 gives the results of some tests for tenacity and electrical resistance carried out at draw ratios of 4:1 , 5:1 and 6:1 , and at different draw temperatures. Two tests were carried out, using a different sample of tape, under each set of conditions of draw ratio and draw temperature. In both tests, the tape comprises a central core 1 of Amoco polypropylene grade 50103, making up about 75% by weight of the tape, and surface layers 2,3 of Cabelec carbon compound ref. 3140, having a carbon loading of about 30%, making up the remainder (circa 25%).
  • the final dimensions of the tape after drawing clearly depend upon the amount of drawing carried out.
  • typical final widths are 2.35 mm for 4:1 draw ratio, 2.1 mm for 5:1 draw ratio and 1.92 mm for 6:1 draw ratio.
  • the drawn tapes may be incorporated in a synthetic fabric. Where the fabric is a woven fabric, the tapes may be incorporated, during the weaving process, in the warp and/or weft. Because, however, the tapes of this invention can typically be of comparable strength to conventional non-conductive synthetic plastics tapes, it is envisaged that fabrics comprising 100% of the co-extruded tapes as herein described may be designed to meet both the physical and electrical conductivity demands to be met, for instance, by a material for use in the manufacture of intermediate bulk containers where build-up of static electricity needs to be limited.
  • the electrical conductivity control resides with the conductive components.
  • a fabric manufactured from conventional plastic tape yarns in which conductive tapes as described herein are incorporated in the warp only every few, say about 8, warp yarns (about 20 mm apart) exhibit a surface resistivity roughly between 2.00 x 10 6 ohms and 8.00 x 10 12 ohms, depending upon the type of weave and which side of the fabric is being tested.
  • the charging and discharging behaviour of the samples tested was found to be broadly similar to a typical fabric interwoven with stainless steel thread. Typical charge densities when the fabric is isolated were about 0.3 nC/cm 2 but these are considerably reduced, sometimes to zero, when the fabric is earthed.
  • the advantage of the conductive tape described herein over, say, stainless steel or synthetic yarn having dispersed conductive material is that the conductive tape described herein can be made to have similar physical properties to the rest of the tape in the fabric. This is the result of confining the conductive element of the construction to the specific layers in the tape which do not contribute significantly to the final physical properties, leaving the manufacturer free to impart particular desired physical properties to the product as a whole since the central "core" material, being free of conductive material can be processed to provide similar physical characteristics to the tapes in the body fabric.

Landscapes

  • Laminated Bodies (AREA)
  • Artificial Filaments (AREA)

Abstract

Cette invention concerne une matière filamenteuse électriquement conductrice qui a la forme d'un ruban et qui comprend, vue en coupe, au moins trois couches: une couche interne non conductrice (1), constituée, par exemple, de polypropylène, et des couches externes (2, 3) constituées d'une matière conductrice, par exemple un composé conducteur de polypropylène chargé de 30 % en poids de noir de carbone. La couche interne représente une partie suffisamment importante de l'ensemble pour déterminer en grande partie les propriétés physiques de la bande et pour permettre à la bande de base non chargée de subir un étirement, à la chaleur, jusqu'à des taux élevés d'étirage de filage, par exemple de l'ordre de 3 pour 1 à 10 pour 1. Il est possible de tisser cette matière pour fabriquer une étoffe requérant une faible résistivité superficielle, destinée par exemple à neutraliser les effets de l'électricité statique.
PCT/GB1996/000698 1995-03-23 1996-03-21 Matieres filamenteuses conductrices WO1996029709A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GBGB9505855.8A GB9505855D0 (en) 1995-03-23 1995-03-23 Conductive Filamentary Materials
GB9505855.8 1995-03-23
GBGB9513704.8A GB9513704D0 (en) 1995-07-05 1995-07-05 Conductive filamentary materials
GB9513704.8 1995-07-05

Publications (1)

Publication Number Publication Date
WO1996029709A1 true WO1996029709A1 (fr) 1996-09-26

Family

ID=26306726

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1996/000698 WO1996029709A1 (fr) 1995-03-23 1996-03-21 Matieres filamenteuses conductrices

Country Status (1)

Country Link
WO (1) WO1996029709A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1417394A (en) * 1971-10-18 1975-12-10 Ici Ltd Conductive textile materials
FR2299706A1 (fr) * 1975-02-03 1976-08-27 Kureha Chemical Ind Co Ltd Film plastique recouvert sur chaque face d'une couche metallisee
WO1990006265A1 (fr) * 1988-11-30 1990-06-14 The Dow Chemical Company Materiau en feuille antistatique, emballage et procede de fabrication
EP0413886A1 (fr) * 1989-08-19 1991-02-27 EUREA VERPACKUNGS GMBH & CO. KG. Tissu à haute résistance en fibres synthétiques ainsi que conteneur et sangle de levage réalisés avec ce tissu
JPH06226917A (ja) * 1993-02-02 1994-08-16 Denki Kagaku Kogyo Kk 耐熱導電性キャリアテープ
US5358782A (en) * 1992-12-15 1994-10-25 E. I. Du Pont De Nemours And Company Coextruded multi-layered, electrically conductive polyimide film

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1417394A (en) * 1971-10-18 1975-12-10 Ici Ltd Conductive textile materials
FR2299706A1 (fr) * 1975-02-03 1976-08-27 Kureha Chemical Ind Co Ltd Film plastique recouvert sur chaque face d'une couche metallisee
WO1990006265A1 (fr) * 1988-11-30 1990-06-14 The Dow Chemical Company Materiau en feuille antistatique, emballage et procede de fabrication
EP0413886A1 (fr) * 1989-08-19 1991-02-27 EUREA VERPACKUNGS GMBH & CO. KG. Tissu à haute résistance en fibres synthétiques ainsi que conteneur et sangle de levage réalisés avec ce tissu
US5358782A (en) * 1992-12-15 1994-10-25 E. I. Du Pont De Nemours And Company Coextruded multi-layered, electrically conductive polyimide film
JPH06226917A (ja) * 1993-02-02 1994-08-16 Denki Kagaku Kogyo Kk 耐熱導電性キャリアテープ

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 018, no. 602 (M - 1705) 16 November 1994 (1994-11-16) *

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