EP4145956A1 - Structure en nappe souple - Google Patents

Structure en nappe souple Download PDF

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Publication number
EP4145956A1
EP4145956A1 EP22189993.3A EP22189993A EP4145956A1 EP 4145956 A1 EP4145956 A1 EP 4145956A1 EP 22189993 A EP22189993 A EP 22189993A EP 4145956 A1 EP4145956 A1 EP 4145956A1
Authority
EP
European Patent Office
Prior art keywords
functional layer
planar structure
layer
electrically conductive
printed
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.)
Pending
Application number
EP22189993.3A
Other languages
German (de)
English (en)
Inventor
Benjamin Dr. Nassauer
Sebastian Mikulski
Christian Jörger
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.)
Benecke Kaliko AG
Original Assignee
Benecke Kaliko AG
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 DE102021211137.8A external-priority patent/DE102021211137A1/de
Application filed by Benecke Kaliko AG filed Critical Benecke Kaliko AG
Publication of EP4145956A1 publication Critical patent/EP4145956A1/fr
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
    • H05B3/34—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater flexible, e.g. heating nets or webs
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • H05B3/12—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
    • H05B3/14—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
    • H05B3/145—Carbon only, e.g. carbon black, graphite
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/013—Heaters using resistive films or coatings
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/029—Heaters specially adapted for seat warmers

Definitions

  • the invention relates to a flexible surface structure, comprising a cover substrate of at least one layer design with an underside and a top side, which at the same time represents the top side of the surface structure, and an electrically conductive functional layer that is arranged underneath the cover substrate.
  • Flexible fabrics of the type mentioned are widely known and are used, for example, to cover contact surfaces in motor vehicles, for example on seat surfaces, steering wheels and armrests. If these fabrics are to be heated, wire heaters are used as standard, i. H. Wires are incorporated in the area of a cover created from the fabric or underneath, which work as resistance heating and heat up when subjected to electrical current. Furthermore, heating foils are used, which are relatively stiff, which is detrimental to comfort. Sensors and other electrical functional elements are also implemented with comparable structures.
  • an electrically heatable surface element for a vehicle seat in which an electrically conductive coating designed as a resistance heater is applied to an electrically non-conductive carrier layer, which is formed by an electrically conductive paste that is printed onto the carrier layer.
  • a fixed print pattern in the form of a net or lattice structure is used in order to obtain a universal surface element provided as roll goods, which can be used as a heater after cutting and appropriate contacting by means of electrodes.
  • This known surface element can, for example, be arranged underneath a cover made of artificial leather.
  • the object of the invention is therefore to propose a flexible fabric of the type mentioned at the beginning, which has an electrically conductive functional layer that can be integrated as close as possible to the cover substrate without additional padding by a foam layer, whose haptic properties are not influenced as far as possible and even under permanent mechanical stress remains functional. Furthermore, a high degree of freedom in the possible component geometries should be achieved and contacting should be possible at a freely selectable point in the non-visible area.
  • the electrically conductive functional layer is applied directly to the underside of the cover substrate and is formed by an electrically non-conductive carrier film and printed conductors made of at least one electrically conductive paste and dried on the carrier film.
  • the functional layer is thus printed on a non-conductive carrier film in adaptation to the desired electrical function and the intended geometry of a component to be provided with the flexible surface structure with a correspondingly adapted individual course of the conductor tracks, for which purpose one or more conductive ones known per se and available on the market pastes are processed.
  • the electrically conductive functional layer formed in this way is applied firmly and directly to the underside of the cover substrate, for example by lamination, and is therefore located as a connected unit directly below the cover substrate, which can serve as a reference material, for example.
  • the cover substrate can be formed, for example, from a single-layer or multi-layer artificial leather, a textile fabric or a natural leather.
  • the carrier film and the electrically conductive pastes used for the printing are preferably designed to be particularly stretchable, in that they are made of particularly elastic plastics and have a low material thickness. They are therefore also suitable for cyclic elongation loads over the entire product service life.
  • the electrically conductive functional layer of the flexible fabric according to the invention is applied directly to the underside of the cover substrate in an adhesive manner, it is in the closest possible arrangement to the cover substrate, which ensures particularly good heat transfer in heating applications and prevents falsification of the measurement results in sensor applications of the functional layer.
  • the conductive paste can comprise electrically conductive particles in a polymer matrix, with the conductive paste also being able to be configured as a heating element, in particular graphite particles or others weakly conductive particles and, for the formation of highly conductive conductor tracks and electrodes or for the formation of sensors, silver particles or similar very conductive particles or structures.
  • a first layer of a highly conductive paste can be printed onto the carrier foil in order to form conductor tracks for making contact with connection lines and for supplying resistance heating elements.
  • a further layer of a paste suitable for heating applications can then be printed onto this layer, for example, in order to form one or more resistance heating elements.
  • the printed image itself can always be freely selected and is preferably in the form of strips or lines.
  • the carrier foil can be made of suitable plastics, e.g. polyolefins, polyester or polyurethane.
  • the pastes can be applied to the carrier film using suitable printing methods, such as screen printing.
  • suitable printing methods such as screen printing.
  • the layer thickness of the dried paste should preferably be in the range of 5-30 ⁇ m.
  • an electrically non-conductive paste can also be printed on the carrier film in areas not printed with the electrically conductive paste to form the conductor tracks and/or on the conductor tracks from the printed conductive paste itself, which paste takes on the function of an insulator .
  • the carrier film is placed with its side printed with the paste on the underside of the cover substrate and is adhesively connected to it, for example by (thermal) lamination.
  • An adhesive connection can also be provided.
  • the carrier film then lies on the underside facing away from the cover substrate and, according to a further proposal of the invention, can also be used after the conductor tracks have been connected to the underside of the Cover substrate are deducted, whereby the conductor tracks are exposed on the cover substrate.
  • the carrier film thus only fulfills the function of a print carrier and is removed again in a transfer process after the functional layer has been applied to the cover substrate, so that only the printed conductor tracks remain on the cover substrate.
  • crimp connectors with a U-shaped cross section can be provided, which are arranged at a distance from one another on the edge of the sheetlike structure and overlap the cover substrate and the functional layer, making electrical contact with the functional layer .
  • the flexible fabric according to the invention provides that at least one further layer is provided below the electrically conductive functional layer on the side facing away from the cover substrate.
  • This at least one further layer can serve to optimize the haptic, electrical and thermal properties or the processing of the flexible planar element according to the invention.
  • layers include foams or foam layers, for example also reticulated foam layers, spacer fabrics, fleeces, mirror foils, barrier foils or adhesive layers, which can be provided individually or in combination below the functional layer.
  • the flexible planar structure according to the invention can comprise a wide variety of electrically conductive functional layers, with a heating element, an occupancy or proximity sensor, a temperature sensor, a humidity sensor, a strain sensor, a heart rate sensor and/or an antenna as well as light-emitting elements and generally conductor tracks being formed in particular by means of the conductor tracks of the functional layer can.
  • the electronics formed by printing the carrier film and consisting of the printed conductor tracks can be combined with classic electronic components, for example LEDs, microchips and sensors, in order to form hybrid electronics.
  • the flexible surface element explained above can be used in particular as a cover material for vehicle seats, as an automotive interior part, in aircraft, public transport, ships, yachts, public facilities, for upholstered furniture or massage tables or for sports equipment, bicycles, mobile homes (caravans, mobile homes, tiny houses), helmets , gloves, shoes and personal protective equipment are used.
  • the only figure shows a schematic, simplified representation of a flexible surface element 1, which can be used, for example, as a cover material for a car seat.
  • the flexible planar element 1 comprises a cover substrate 10 comprising several layers 100, 101, 102, which is provided, for example as artificial leather, with a textile carrier layer 100, a foam layer applied thereto or a foam layer 101 and a top layer 102, which may also have a leather grain on the surface is embossed.
  • the cover coat 102 forms the upper side of the cover substrate 10, the textile carrier layer 100 accordingly the underside of the cover substrate 10. At the same time, the cover coat 102 also forms the upper surface of the entire flexible fabric 1.
  • an electrically conductive functional layer 11 is arranged immediately adjacent, which in turn consists of several layers explained below.
  • the functional layer 11 is formed by an electrically non-conductive carrier film 110, for example made of a polyurethane, is printed on one of its surfaces with a commercially available electrically conductive paste 111 containing electrically conductive particles, for example based on silver in a polymer matrix.
  • the print pattern is selected in such a way that conductor tracks are formed from the electrically conductive paste 111 after drying and curing on the carrier film 110, which give the functional layer 11 a desired functionality.
  • the conductor tracks printed from the conductive paste 111 can be used to conduct current, which is applied to the functional layer 11 in the application.
  • electrically conductive paste 112 can be printed in a further layer onto the conductor tracks used for carrying current from the paste 111 in order to ensure, for example, the function as a heating element.
  • the electrically conductive paste 112 comprises, for example, graphite particles in a polymer matrix, which cause heating due to the high resistance when an electric current is applied.
  • printing can also be carried out with an electrically non-conductive paste 113, which also covers the conductor tracks from the electrically conductive paste 111,112 over the entire surface or partially covered and acts as an insulator.
  • a foam layer 12 made of cut foam, a mirror film 13 and an adhesive layer 14 or similar layers can be provided below the functional layer 11 formed in this way, i. H. on the side facing away from the cover substrate 10.
  • the crimp connectors 2 are provided, for example, on the opposite edges of the fabric 1, wherein in the illustrated embodiment according to figure 1 such a crimp connector 2 can be seen.
  • the crimp connector 2 overlaps both the cover substrate 10 and the electrically conductive functional layer 11 at the edge, but in the illustrated exemplary embodiment only the carrier film 10 and the conductor tracks printed from the paste 111 overlap and are electrically contacted by pressing. In this respect, these two layers of the functional layer 11 are formed with a certain lateral overhang over the further layers 112 , 113 and the further layers 12 , 13 and 14 .
  • the functional layer 11 designed in this way is attached to the underside of the cover substrate 10, which is formed by the textile carrier layer 100 in the exemplary embodiment shown, for example by laminating the printed carrier film 110 onto the underside surface of the textile carrier layer 100.
  • the functional layer 11 is mechanically fixed by such an application of the functional layer 11 directly to the underside of the cover substrate 10 . Since the functional layer 11 is produced in the area of its conductors by a printing process, there are no restrictions whatsoever with regard to the geometry and functionality that can be represented. In later applications, the contact can be made in an area that is not visible, e.g. at the edge of the same.
  • the functional layer 11 is preferably designed with the smallest possible layer thickness, so that no additional foam layer is required between the functional layer 11 and the cover substrate 10 . In addition, the haptics of the covering substrate 10 are not impaired by the thin functional layer 11 .
  • the functional layer 11 assumes the function of a heater, the desired heating effect occurs just below the surface of the covering substrate 10, which leads to short heating-up times with low energy consumption.
  • the flexible fabric 1 can also be used as a radiant heater.

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  • Laminated Bodies (AREA)
EP22189993.3A 2021-09-07 2022-08-11 Structure en nappe souple Pending EP4145956A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021209845 2021-09-07
DE102021211137.8A DE102021211137A1 (de) 2021-09-07 2021-10-04 Flexibles Flächengebilde

Publications (1)

Publication Number Publication Date
EP4145956A1 true EP4145956A1 (fr) 2023-03-08

Family

ID=82899126

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22189993.3A Pending EP4145956A1 (fr) 2021-09-07 2022-08-11 Structure en nappe souple

Country Status (1)

Country Link
EP (1) EP4145956A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007055015A1 (de) * 2006-11-14 2008-06-05 Pantrac Gmbh Flächenheizelement
DE202011004140U1 (de) * 2010-04-06 2012-06-25 W.E.T. Automotive Systems Ag Multifunktionsprodukt
WO2014106963A1 (fr) * 2013-01-07 2014-07-10 Kim Youn Joung Procédé permettant de préparer un tissu d'élément chauffant flexible
DE202017006756U1 (de) * 2017-05-08 2018-04-20 Michael Steidle Textiles Gebilde
EP3085198B1 (fr) 2013-12-20 2019-12-11 Benecke-Kaliko AG Élément de surface pouvant être chauffé électriquement
EP3740030A2 (fr) * 2019-05-14 2020-11-18 Michael Steidle Élément chauffant plan

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007055015A1 (de) * 2006-11-14 2008-06-05 Pantrac Gmbh Flächenheizelement
DE202011004140U1 (de) * 2010-04-06 2012-06-25 W.E.T. Automotive Systems Ag Multifunktionsprodukt
WO2014106963A1 (fr) * 2013-01-07 2014-07-10 Kim Youn Joung Procédé permettant de préparer un tissu d'élément chauffant flexible
EP3085198B1 (fr) 2013-12-20 2019-12-11 Benecke-Kaliko AG Élément de surface pouvant être chauffé électriquement
DE202017006756U1 (de) * 2017-05-08 2018-04-20 Michael Steidle Textiles Gebilde
EP3740030A2 (fr) * 2019-05-14 2020-11-18 Michael Steidle Élément chauffant plan

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