EP0459838B1 - Revêtement à feuille flexible - Google Patents

Revêtement à feuille flexible Download PDF

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Publication number
EP0459838B1
EP0459838B1 EP19910305023 EP91305023A EP0459838B1 EP 0459838 B1 EP0459838 B1 EP 0459838B1 EP 19910305023 EP19910305023 EP 19910305023 EP 91305023 A EP91305023 A EP 91305023A EP 0459838 B1 EP0459838 B1 EP 0459838B1
Authority
EP
European Patent Office
Prior art keywords
layers
layer
low
flexible
sheeting
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
Application number
EP19910305023
Other languages
German (de)
English (en)
Other versions
EP0459838A2 (fr
EP0459838A3 (en
Inventor
Hugh Macpherson
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.)
WL Gore and Associates UK Ltd
Original Assignee
WL Gore and Associates UK Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by WL Gore and Associates UK Ltd filed Critical WL Gore and Associates UK Ltd
Publication of EP0459838A2 publication Critical patent/EP0459838A2/fr
Publication of EP0459838A3 publication Critical patent/EP0459838A3/en
Application granted granted Critical
Publication of EP0459838B1 publication Critical patent/EP0459838B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/02—Mechanical actuation
    • G08B13/12—Mechanical actuation by the breaking or disturbance of stretched cords or wires
    • G08B13/126—Mechanical actuation by the breaking or disturbance of stretched cords or wires for a housing, e.g. a box, a safe, or a room

Definitions

  • This invention relates to flexible sheeting suitable for use in forming a security enclosure for an article, and to security enclosures formed from such sheeting.
  • Flexible sheeting suitable for use in forming a security enclosure is already known, for example, from EP-A-0347209.
  • the layer of flexible sheeting carries a flexible semiconductive line arranged to extend over the whole area of the enclosure. Further, two layers of semiconductive fibres also cover the whole area of the enclosure and are separated by an insulating layer.
  • the semiconductive line and the layers of semiconductive fibres when connected to a monitor circuit, give rise to an indication of attempted interference by an outside agency on penetration of the sheeting.
  • the known sheeting provides security against penetration by a small diameter puncture tool, such as a needle, but there is a need to provide security against penetration by a small diameter radiant energy cutting tool, such as a laser beam.
  • flexible sheeting suitable for use in forming a security enclosure for an article, said sheeting comprising a flexible layer of insulant material having adherent to its opposite surfaces respective layers of electrically-conductive low-melt material, said low melt material being in solid form at ambient temperatures but being rendered fluid by the energy from a small diameter radiant energy cutting tool, so that, when the layers of low-melt material are connected to an electrical monitor circuit a change in electrical characteristic is detectable, in use, by flow of the fluidised low-melt material through the hole in the layer of insulant material formed by the cutting tool.
  • each low-melt material layer is approximately the same as or slightly greater than that of the layer of insulant material, each such layer having a thickness of less than 25 microns.
  • each low-melt material layer is 8-12 microns in thickness and the insulant material layer is about 12 microns in thickness.
  • the low-melt material preferably fluidises at about 100°C.
  • the insulant material layer is made of polyester film and each low-melt material layer is made of carbon-filled polyester, the latter being applied to the insulant material layer by screen printing.
  • the carbon-filled polyester is 50% filled with graphitic carbon to provide a resistivity of the order of 0.3 ohms-cm.
  • Other materials may be used to form the electrically-conductive low-melt material for example certain thermoplastic resins such as polyamides, polyethers, polyurethanes, polyvinyl acetate and certain uncured silicones loaded with carbon or conductive salts such as caesium iodide. Primarily these materials are of low molecular weight and fluidise at temperatures in the range 70 to 130°C.
  • the sheeting incorporates outer coverings bonded to the layers of low-melt material.
  • the outer coverings may be carbon-loaded polyester coated onto polyester film with the carbon content selected to provide high colour (jetness) with minimum change to electrical resistance on penetration or fluidisation due to its very high resistivity, the latter preferably being in excess of 10 13 ohm-cm.
  • the outer coverings may be adherent to the respective layers of low-melt material by an adhesive, such as polyester, providing a patterned coverage of the outer coverings sufficient in areal extent to laminate the sheeting.
  • the adhesive layer may be over-printed on the low-melt material.
  • the present invention provides flexible sheeting suitable for use in forming a security enclosure for an article, said sheeting comprising two flexible layers of electrically-conductive fibrous material separated by a flexible layer of insulant material, each of said fibrous material layers being bonded substantially throughout its entire area to said insulant material layer by a flexible layer of electrically-conductive adhesive, said adhesive layer being a laminate comprising a layer of carbon bound at ambient temperatures in a matrix of low-melt material, and wherein the length of the fibres of the fibrous material is greater than the thickness of the layers of adhesive and insulant.
  • each low-melt material layer is approximately the same as or slightly greater than that of the layer of insulant material, each such layer having a thickess of less than 25 microns.
  • each low-melt material layer is 8-12 microns in thickness and the insulant material layer is about 12 microns in thickness.
  • the low-melt material preferably fluidises at about 100°C.
  • the insulant material layer is made of polyester film and each low-melt material layer is made of carbon-filled polyester, the latter being applied to the insulant material layer by screen printing and over-printed with an adhesive, such as polyester, providing a patterned coverage of the low-melt material layer sufficient in areal extent to laminate the sheeting.
  • the carbon-filled polyester is 50% filled with graphitic carbon to provide a resistivity of the order of 0.3 ohms-cm.
  • the layers of fibrous material are made of unsintered carbon-loaded PTFE having a volume resistivity in the range 1 to 10 ohm-cm and of the order of 75 microns in thickness.
  • the sheeting incorporates outer coverings bonded to the layers of fibrous material by non-conductive adhesive.
  • the adhesive may be over-printed onto the fibrous material layers, and may be polyester, providing a patterned coverage sufficient in areal extent to laminate the sheeting.
  • the outer coverings may be carbon-loaded polyester coated onto polyester film with the carbon content selected to provide high colour (jetness) with minimum change to electrical resistance on penetration or fluidisation due to its very high resistivity, the latter preferably being in excess of 10 13 ohm-cm.
  • the present invention provides a security enclosure formed of flexible sheeting according to the present invention, each layer of low-melt material being connected to an electrical monitor circuit.
  • the monitor circuit may be an impedance monitoring bridge circuit.
  • the sheeting and the enclosure provides security against penetration by a radiant energy cutting tool such as a laser beam.
  • the flexible sheeting 10 which is shown in Fig. 1 in exploded form comprises various layers each of which is flexible including layer 11 which is an insulant layer, layers 12, 13, each of which is electrically conductive having a resistivity of the order of 0.3 to 0.4 ohm-cm and outer cover layers 14, 15, each of which is essentially an insulating layer.
  • Layer 11 is made of polyester film being about 12 microns in thickness for best results but which should not be more than 25 microns in thickness.
  • the layers 12, 13, are screen printed on either side of layer 11 and are about 8 to 25 microns in thickness.
  • layers 12, 13 are each composed of a polyester matrix which is loaded with graphitic carbon to a level of about 50% by weight in order to render layers 12, 13, electrically conductive and to provide these layers with low-melt characteristics, the latter being provided by the polyester which has a melting point of the order of 100°C.
  • Outer cover layers 14, 15, are also made of polyester loaded with carbon and coated onto a polyester film carrier but the loading is selected to provide very high resistivity (of the order of 10 13 ohm-cm or greater) and high blackness in colour. Cover layers 14, 15, are adherent to the layers 12, 13, by an adhesive such as polyester over-printed onto layers 12, 13, to provide a patterned coverage of about 30% in areal extent.
  • sheeting 10 is a laminate and the layers 12, 13, are essentially homogeneous and complete over their entire areal extent.
  • the areal extent of layer 12 is substantially identical to that of layer 13, each being slightly less in areal extent than layer 11 to provide insulation at the edges of the layers 12, 13.
  • Fig. 2 illustrates a partly formed security enclosure 20 made of the sheeting 10 by initially forming the layer 11 of the sheeting to a box blank shape and folding the shaped sheeting along lines 21 to provide a box-like configuration which can envelope or enclose an article (not shown) to be protected.
  • the adjacent edges 22 of the folded sheeting 10 may abut or overlap and may be held in place by a wrapping (not shown).
  • An electrical monitor circuit 23 is connected to the enclosure 20 to provide impedance monitoring across the insulant layer 11 by means of the conductive layers 12, 13, functioning as conductive termination pads. Circuit 23 may be connected to the layers 12, 13, via strip copper conductors.
  • Fig. 3 illustrates a modified form of flexible sheeting 30 which incorporates all of the components of sheeting 10 but additionally incorporates layers 31, 32, of electrically-responsive fibrous material, preferably carbon-loaded unsintered PTFE between the outer cover layers 14, 15, and the layers 12, 13.
  • the fibres of layers 31, 32 are of sufficient length to extend from one of the layers 31, 32, to the other of the layers 31, 32, when penetrated by a piercing tool.
  • Layers 31, 32 are secured by polyester adhesive to both cover layers 14, 15, and layers 12, 13, with the adhesive patterned to give about 30% coverage.
  • Layers 31, 32 are accordingly in electrical contact with layers 12, 13, and may be used as interconnectors between the layers 12, 13, and the monitor circuit 23 in the Fig. 2 arrangement to avoid strip copper conductors. This has the additional benefit that, in use, only a single monitor circuit is required for both the layers 12, 13, and the layers 31, 32, the latter functioning as a security measure against piercing.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Laminated Bodies (AREA)
  • Wrappers (AREA)

Claims (9)

  1. Revêtement à feuille flexible à utiliser pour former une enveloppe de sécurité pour un article qui comprend une couche flexible (11) de matière isolante à laquelle adhèrent, sur ses surfaces opposées, des couches respectives (12, 13) de matière électriquement conductrice, caractérisé en ce que les couches électriquement conductrices sont en matière à bas point de fusion, ladite matière à bas point de fusion étant sous une forme solide aux températures ambiantes mais étant rendue fluide par l'énergie qui provient d'un outil de coupe à énergie rayonnante de petit diamètre, de sorte qu'une modification de la caractéristique électrique est détectable en cours d'utilisation, dès lors que les couches (12, 13) de matière à bas point de fusion sont connectées à un circuit (23) de contrôle électrique, par un écoulement de la matière à bas point de fusion fluidisée à travers un orifice ménagé dans la couche (11) de matière isolante formée par l'outil de coupe.
  2. Revêtement à feuille flexible selon la revendication 1, caractérisé en ce que l'épaisseur de chaque couche (12, 13) de matière à bas point de fusion est approximativement égale ou légèrement supérieure à celle de la couche (11) de matière isolante.
  3. Revêtement à feuille flexible selon la revendication 1 ou 2, caractérisé en ce que la couche (12, 13) en matière à bas point de fusion est en polyester chargé de carbone appliqué par sérigraphie sur la couche (11) de matière isolante.
  4. Revêtement à feuille flexible selon la revendication 1, 2 ou 3, caractérisé en ce qu'il incorpore en outre des recouvrements extérieurs (14, 15) attachés aux couches (12, 13) de matière à bas de fusion.
  5. Revêtement à feuille flexible selon la revendication 4, caractérisé en ce que les recouvrements extérieurs (14, 15) sont en polyester chargé de carbone appliqué sur un film de polyester.
  6. Revêtement à feuille flexible à utiliser pour former une enveloppe de sécurité pour un article, ledit revêtement en feuille comprenant deux couches flexibles (31, 32) de matière fibreuse électriquement conductrice séparées par une couche flexible (11) de matière isolante, caractérisé en ce que chacune desdites couches (31, 32) de matière fibreuse est attachée sensiblement sur toute sa surface à ladite couche (11) de matière isolante par une couche flexible d'adhésif électriquement conducteur (12, 13), ladite couche d'adhésif (12, 13) étant un stratifié qui comprend une couche de carbone attachée à températures ambiantes dans une matrice de matière à bas point de fusion, et en ce que la longueur des fibres de la matière fibreuse est supérieure à l'épaisseur des couches (11, 12, 13) d'adhésif et d'isolant.
  7. Revêtement à feuille flexible selon la revendication 6, caractérisé en ce qu'il incorpore en outre des recouvrements extérieurs (14, 15) attachés aux couches de matière 12 fibreuse (enclins (31, 32) par un adhésif non conducteur.
  8. Revêtement à feuille flexible selon la revendication 7, caractérisé en ce que les recouvrements extérieurs (14, 15) sont en polyester chargé de carbone, la teneur en carbone étant sélectionnée pour produire, en raison de sa résistivité très élevée, une couleur forte (noir jais) pour une modification minimale de la résistance électrique lors de la pénétration ou de la fluidisation.
  9. Une enveloppe de sécurité formée d'un revêtement en feuille flexible qui consiste en couches multiples et incorpore une couche (11) en matière isolante à laquelle adhèrent, sur ses surfaces opposées, des couches respectives (12, 13) de matière électriquement conductrice et un circuit (23) de contrôle électrique connecté auxdites couches électriquement conductrices (12, 13), caractérisée en ce que ledites couches électriquement conductrices sont en une matière à bas point de fusion qui est solide aux températures ambiantes mais se fluidise à des températures voisines de 100° ou moins, de façon que le circuit (23) de contrôle électrique détecte une fluidisation qui y apparaît.
EP19910305023 1990-06-01 1991-06-03 Revêtement à feuille flexible Expired - Lifetime EP0459838B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB909012272A GB9012272D0 (en) 1990-06-01 1990-06-01 Flexible sheeting
GB9012272 1990-06-01

Publications (3)

Publication Number Publication Date
EP0459838A2 EP0459838A2 (fr) 1991-12-04
EP0459838A3 EP0459838A3 (en) 1992-08-12
EP0459838B1 true EP0459838B1 (fr) 1996-08-14

Family

ID=10676925

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910305023 Expired - Lifetime EP0459838B1 (fr) 1990-06-01 1991-06-03 Revêtement à feuille flexible

Country Status (4)

Country Link
EP (1) EP0459838B1 (fr)
JP (1) JPH04232044A (fr)
DE (1) DE69121318T2 (fr)
GB (2) GB9012272D0 (fr)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9113437D0 (en) * 1991-06-21 1991-08-07 Gore W L & Ass Uk Improvements in security enclosures
GB9113436D0 (en) * 1991-06-21 1991-08-07 Gore W L & Ass Uk Improvements in security enclosures
GB9115641D0 (en) * 1991-07-19 1991-09-04 Gore W L & Ass Uk Protective sheath
GB2270785B (en) * 1992-09-22 1996-05-08 Gore & Ass Improvements in security enclosure manufacture
DE19600769A1 (de) * 1996-01-11 1997-07-17 Ibm Sicherheitsmodul mit einteiliger Sicherheitsfolie
DE19600770C2 (de) * 1996-01-11 1997-11-13 Ibm Sicherheitsfolie mit EMV-Schutz
GB9712145D0 (en) 1997-06-12 1997-08-13 Gore W L & Ass Uk Folding apparatus
GB2330439A (en) * 1997-10-17 1999-04-21 Gore & Ass Tamper respondent enclosure
US6556138B1 (en) * 1998-12-31 2003-04-29 Ziro Limit Composite, Inc. Secure storage and transport container for the handling of controlled materials
DE102004049947A1 (de) * 2004-10-13 2006-05-04 Edscha Cabrio-Dachsysteme Gmbh Alarmvorrichtung für Verdecke
FR2888025A1 (fr) * 2005-06-30 2007-01-05 Sagem Comm Materiau en film pour la detection d'intrusion, et conteneur securise incorporant un tel materiau
DE102010054683A1 (de) * 2010-12-14 2012-06-14 Sächsisches Textilforschungsinstitut e.V. Sicherheits-Packvorrichtung
DE102018110286B4 (de) * 2018-04-27 2023-11-16 Relytex Gmbh & Co. Kg Verpackungssystem

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2411294A1 (fr) * 1977-12-08 1979-07-06 Houplain Marcel Revetement de securite pour panneaux de portes ou similaires
US4388267A (en) * 1981-01-29 1983-06-14 The United States Of America As Represented By The United States Department Of Energy Temperature profile detector
PL138268B1 (en) * 1982-08-13 1986-08-30 Politechnika Warszawska Linear fire detector of warning fire protection system
FR2555783A1 (fr) * 1983-08-09 1985-05-31 Guerineau Yves Revetement de protection
JPS6048134U (ja) * 1983-09-09 1985-04-04 株式会社　潤工社 温度検知装置
DE3527873A1 (de) * 1985-08-02 1987-02-05 Siemens Ag Flaechenschutz gegen sabotage an einer einbruchmeldezentrale
US4859989A (en) * 1987-12-01 1989-08-22 W. L. Gore & Associates, Inc. Security system and signal carrying member thereof
GB8814471D0 (en) * 1988-06-17 1988-07-20 Gore & Ass Security enclosure

Also Published As

Publication number Publication date
DE69121318D1 (de) 1996-09-19
GB2245738B (en) 1994-02-09
EP0459838A2 (fr) 1991-12-04
DE69121318T2 (de) 1997-03-06
GB2245738A (en) 1992-01-08
GB9111714D0 (en) 1991-07-24
EP0459838A3 (en) 1992-08-12
JPH04232044A (ja) 1992-08-20
GB9012272D0 (en) 1990-07-18

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