EP0785700A1 - Glasscheibe mit elektrischen Heizleitern und Verfahren zu ihrer Herstellung - Google Patents

Glasscheibe mit elektrischen Heizleitern und Verfahren zu ihrer Herstellung Download PDF

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Publication number
EP0785700A1
EP0785700A1 EP97400080A EP97400080A EP0785700A1 EP 0785700 A1 EP0785700 A1 EP 0785700A1 EP 97400080 A EP97400080 A EP 97400080A EP 97400080 A EP97400080 A EP 97400080A EP 0785700 A1 EP0785700 A1 EP 0785700A1
Authority
EP
European Patent Office
Prior art keywords
heating network
glazing
heating
transfer member
thin layer
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.)
Withdrawn
Application number
EP97400080A
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English (en)
French (fr)
Inventor
André Beyrle
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.)
Saint Gobain Glass France SAS
Original Assignee
Saint Gobain Vitrage SA
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 Saint Gobain Vitrage SA filed Critical Saint Gobain Vitrage SA
Publication of EP0785700A1 publication Critical patent/EP0785700A1/de
Withdrawn legal-status Critical Current

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    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00Ohmic-resistance heating
    • H05B3/84Heating arrangements specially adapted for transparent or reflecting areas, e.g. for demisting or de-icing windows, mirrors or vehicle windshields
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/017Manufacturing methods or apparatus for heaters

Definitions

  • the invention relates to glazing comprising a heating network.
  • the invention relates in particular to a screen-printed electrical network for heated glazing, for example for a rear window of a motor vehicle. More specifically, the invention relates to a glazing unit fitted with all of its conductive strips, that is to say strips forming strictly speaking the heating network and collector strips intended to be connected by welding to the supplied current leads. by the vehicle's current source.
  • thermoconductive composition is made of a pasty suspension, in an organic binder, of metallic silver and a frit, that is to say of a glass with low melting point.
  • the resistance bands forming the network are relatively thin so as not to obstruct visibility through the glazing and lead to wider collecting strips, located near the edges of the glazing.
  • These collector strips are made of a composition identical to that of the resistance strips and are deposited in the same way and preferably, at the same time as these. The current leads are then welded to these collecting strips.
  • the first heated glazings thus produced, included very conductive resistance bands, of a particularly high metallic silver content, with a view to a high heating capacity; therefore, the electric power dissipated by the heating network was also very high.
  • high dissipated powers are not well suited to small-displacement motor vehicles, the reserve electrical power of which is relatively low. This is all the more so since motor vehicles are today fitted with a whole series of electrical equipment which means that the maximum power, capable of being dissipated at a given time, is often less than the theoretical capacity required for a simultaneous operation of all electrical equipment in the vehicle.
  • a known method in particular described by patent FR-B-1 464 585, consists in treating the network, previously deposited, by electroplating. This involves depositing a metallic layer electrolytically.
  • Document FR-B-1 464 585 describes in particular a copper deposit which improves the conductivity of the heating network. It is also known to deposit a stack of copper and then nickel layers. Such deposits are made in two successive baths, for example copper sulphate and nickel sulphate. The presence of nickel has the advantage of preventing the risk of corrosion.
  • Such electroplating treatments have certain drawbacks. First of all, they are very expensive. On the other hand, the resistance bands must be very resistant to resist the acidity of the baths used; there is indeed a risk of damage to the heating network.
  • Another method consists in producing the heating network from electroconductive compositions having lower silver contents. If this solution is preferable from a cost point of view, it has other disadvantages; since the resistance bands are not protected, they may in particular undergo corrosion on contact with air. Such corrosion does not necessarily degrade the heating network from a functional point of view, but can modify its appearance. However, such heating networks, in particular arranged on the rear glasses of motor vehicles, are visible and a change in their appearance may possibly affect the aesthetics of the vehicle. In addition, current demand, in particular on the part of automobile manufacturers, is moving towards a quality finish and good durability over time of the materials and of the appearance, in particular aesthetic appearance, of the entire vehicle.
  • the reduction in the silver content poses a problem of compatibility with the soldering of the solder, in other words the solder does not hold well.
  • current industrial practice is to deposit at the places provided for welding a pellet made of a paste with a high silver content, this second deposition being carried out for example by screen printing or with a brush and covering a surface of in the order of 1-4 cm 2 . This technique can improve the resistance of the welds but increases production costs.
  • the object of the invention is therefore a glazing unit comprising a heating network dissipating an acceptable power for current motor vehicles and on which the welding of the current leads does not pose any problem of behavior.
  • the invention also aims to obtain said glazing inexpensively.
  • a glazing unit comprising at least one sheet of glass provided, on one of its faces, with a heating network consisting of resistance bands formed of an electrically conductive composition, resulting from the baking of '' a suspension in an organic binder of metallic silver and a low melting point frit, and of collector strips formed of the same electroconductive composition, at least certain zones of the heating network being directly covered with a thin layer of a weakly conductive or non-conductive material.
  • the material chosen is for example a metal, a metal oxide or an alloy.
  • the layer is a thin layer of nickel.
  • Such a thin layer is provided on the zones of the collector strips on which the terminals or the current leads will be welded. It has indeed appeared that such a thin layer tends to improve the resistance of the soldering of the terminals on the collector strips. It has also appeared, that in particular the resistance to tearing of the soldered lugs on the collector strips increases with the thickness of the thin layer.
  • a thickness of the order of a micron guarantees good resistance of the welds.
  • the low conductivity of the deposited material makes it possible not or very slightly to disturb the conductivity of the network. Measurements made from a layer of nickel show a change in resistance of the order of 1%, which represents an advantage for the technology consisting in obtaining the desired resistance of the network directly when it is produced. .
  • a deposit of copper by electroplating leads to a modification of the conductivity of the network of the order of 15%.
  • the thickness of the thin layer of the material chosen can be less and placed on the remaining parts of the heating network.
  • a deposit in particular in the case of nickel, can prevent any risk of corrosion of the heating network, the thin layer, more particularly of nickel, being directly superimposed on said heating network. While a thickness of the order of a micron is satisfactory for the weld zones, a thickness of the order of a tenth of a micron is sufficient, in particular for an anticorrosion function.
  • a thin layer having the largest desired thickness or, preferably, to provide a thin layer that is not homogeneous in thickness over the entire surface covered with the heating network, that is to say a layer thin having a greater thickness on certain areas, and more particularly, on the areas of header strips intended to receive the terminals.
  • the invention also provides for the possibility of depositing thin layers of at least two different materials, one in particular intended to cover the zones intended to receive the welds and the other material covering the remaining parts of the network in particular for an anti-corrosion function.
  • windows are provided in the collector strips allowing deposition direct from the thin layer on the black enamel.
  • windows will then preferably be provided, in particular at the places provided for the soldering of terminals.
  • the invention also provides a method of manufacturing heated glazing.
  • this method consists in depositing a heating network on one of the faces of a glass sheet constituting the glazing, and in depositing, at least on certain zones of the heating network, a metal initially taking the form of a solid part, by successive rubs of a transfer member on the solid part, then on the heating network. It appeared that the method thus described according to the invention makes it possible to obtain a thin layer covering the heating network. Furthermore, the adhesion of the thin layer obtained by this method is entirely satisfactory and in particular allows soldering of the lugs leading to good resistance to tearing.
  • the transfer member is a wire brush driven by a rotary movement.
  • the solid part for example a bar
  • tear particles from it which, in a second step, are redeposited on the heating network, also by rubbing said brush.
  • a relative movement can also advantageously be provided between the heating network and the metallic transfer member.
  • a fixed brush is used, under which the glazing comprising the heating network passes.
  • Such an embodiment is simple to implement, as soon as one places oneself on the production line of the heating network.
  • the invention provides that the friction between the transfer member and the solid part is carried out with sufficient pressure to tear off metal particles from the solid part.
  • the friction between the transfer member and the heating network is carried out with sufficient pressure to deposit the metal particles carried by the transfer member and in particular so as not to damage said heating network.
  • a device 1 according to the invention is shown.
  • This device 1 consists of a support element 2 associated with a metal brush 3.
  • This brush 3 is mounted on an axis 4, itself associated with means not shown, such as a motor, making it possible to drive the brush 3 in rotation, for example in the direction indicated by the arrow 5.
  • the brush 3 includes metal bristles 6, the choice of length and hardness of which can be defined by a person skilled in the art depending on the metal to be deposited which has been chosen.
  • a location 7 intended to receive a bar 8 made of the metal to be deposited.
  • Means 9, such as a spring, are provided in location 7 so as to exert a force in the direction indicated by the arrow 10. This force keeps the bar 8 in contact with the bristles 6 of the wire brush 3 according to the desired pressure.
  • This pressure can, of course, be defined as a function of the metal constituting the bar 8 and of the nature of the bristles 6.
  • This device 1 therefore allows, during the rotational movement of the brush 3, tearing of metal particles from the bar 8 by rubbing the bristles 6 thereon. And it appears that the particles, removed by the brush 3, remain integral with the bristles 6.
  • the device 1 is provided so that the brush is in a position higher than a device 11.
  • This device 11, shown very schematically in the figure, is designed to bring a glazing 13 in the direction indicated by the arrow 12.
  • the glazing 13 can thus pass under the brush 3.
  • the glazing 13 shown is a simple glazing composed of a single sheet of glass, as are most often the rear glasses comprising a heating network.
  • this glazing 13 can be laminated glazing or any other type of glazing capable of receiving a heating network.
  • the heating network was previously obtained by techniques known to those skilled in the art, such as production by screen printing.
  • the glazing 13 comprises, on its face facing the metal brush 3, the heating network 14.
  • the heating network thus passes under the brush 3 and is partially or totally covered with a thin layer of the chosen material.
  • the object of the invention is to cover the heating network, however, it appeared that it was possible to cover all of the glazing without harming its transparency, due to the very thin thickness of the layer. thin 15.
  • the invention provides for several successive passages of these zones under the same brush 3 by a back-and-forth movement, or alternatively under different brushes 3. It is thus possible to obtain a greater thickness of nickel which in particular promotes the resistance to tearing of the terminals after their welding.
  • the brush As far as the brush is concerned, it has the essential characteristic of being metallic or electrically conductive and sufficiently hard. It is, for example, a steel brush 3 whose bristles or wires have a diameter between 0.1 and 0.5 mm. Before use, the brush 3 is advantageously totally degreased so as to avoid any sliding on the bar 8 which would lead to poor removal of metallic particles.
  • the brush 3 When the glazing 13 scrolls under the device 1, the brush 3 therefore rubs on the surface of the glazing 13, and more particularly on the network heater 14.
  • a thin metal layer 15 is thus formed which covers the network and provides, for example, anti-corrosion protection.
  • Other means are then used to ensure satisfactory pressure of the brush 3 on the network 14, so as to redeposit the metal particles carried by the bristles 6, avoiding, of course, any risk of deterioration of the network 14 and / or of the glazing 13.

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  • Surface Heating Bodies (AREA)
EP97400080A 1996-01-19 1997-01-16 Glasscheibe mit elektrischen Heizleitern und Verfahren zu ihrer Herstellung Withdrawn EP0785700A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9600580 1996-01-19
FR9600580A FR2743973A1 (fr) 1996-01-19 1996-01-19 Vitrage comportant un reseau chauffant et procede de fabrication d'un tel vitrage

Publications (1)

Publication Number Publication Date
EP0785700A1 true EP0785700A1 (de) 1997-07-23

Family

ID=9488255

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97400080A Withdrawn EP0785700A1 (de) 1996-01-19 1997-01-16 Glasscheibe mit elektrischen Heizleitern und Verfahren zu ihrer Herstellung

Country Status (2)

Country Link
EP (1) EP0785700A1 (de)
FR (1) FR2743973A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005006071A2 (fr) 2003-07-09 2005-01-20 Saint-Gobain Glass France Dispositif electrocommandable a proprietes optiques et/ou energetiques variables
US7033655B2 (en) 2000-10-18 2006-04-25 Saint-Gobain Glass France Laminated glazing and means for its peripheral sealing

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1464585A (fr) 1964-04-23 1967-01-06 Saint Gobain Vitrage chauffant pour véhicule, procédé et appareillage pour sa fabrication
DE1291647B (de) * 1964-11-09 1969-03-27 Saint Gobain Heizbare Autoscheibe und Verfahren zu ihrer Herstellung
DE2064955A1 (de) * 1970-12-21 1972-07-13 Germania Spiegelglas Elektrisch beheizbare Glasscheibe mit Bereichen verstärkter Heizleistung
DE2636824A1 (de) * 1975-09-23 1977-03-31 Wtz Bauglas Torgau Verfahren zur herstellung elektrisch heizbarer glasscheiben und keramischer materialien
WO1991010757A1 (fr) * 1990-01-16 1991-07-25 Etienne Broult Procede et appareil de depot d'une matiere d'apport solide constituee de particules d'au moins un metal, alliage, metalloide sur un substrat solide

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1464585A (fr) 1964-04-23 1967-01-06 Saint Gobain Vitrage chauffant pour véhicule, procédé et appareillage pour sa fabrication
DE1291647B (de) * 1964-11-09 1969-03-27 Saint Gobain Heizbare Autoscheibe und Verfahren zu ihrer Herstellung
DE2064955A1 (de) * 1970-12-21 1972-07-13 Germania Spiegelglas Elektrisch beheizbare Glasscheibe mit Bereichen verstärkter Heizleistung
DE2636824A1 (de) * 1975-09-23 1977-03-31 Wtz Bauglas Torgau Verfahren zur herstellung elektrisch heizbarer glasscheiben und keramischer materialien
WO1991010757A1 (fr) * 1990-01-16 1991-07-25 Etienne Broult Procede et appareil de depot d'une matiere d'apport solide constituee de particules d'au moins un metal, alliage, metalloide sur un substrat solide

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7033655B2 (en) 2000-10-18 2006-04-25 Saint-Gobain Glass France Laminated glazing and means for its peripheral sealing
WO2005006071A2 (fr) 2003-07-09 2005-01-20 Saint-Gobain Glass France Dispositif electrocommandable a proprietes optiques et/ou energetiques variables

Also Published As

Publication number Publication date
FR2743973A1 (fr) 1997-07-25

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