EP0740488A2 - Méthode et appareillage pour la fabrication de vitrages pouvant être chauffés électriquement - Google Patents

Méthode et appareillage pour la fabrication de vitrages pouvant être chauffés électriquement Download PDF

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Publication number
EP0740488A2
EP0740488A2 EP96106774A EP96106774A EP0740488A2 EP 0740488 A2 EP0740488 A2 EP 0740488A2 EP 96106774 A EP96106774 A EP 96106774A EP 96106774 A EP96106774 A EP 96106774A EP 0740488 A2 EP0740488 A2 EP 0740488A2
Authority
EP
European Patent Office
Prior art keywords
foils
film
belt press
double belt
heating wires
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Withdrawn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
EP96106774A
Other languages
German (de)
English (en)
Other versions
EP0740488A3 (fr
Inventor
Kurt Held
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0740488A2 publication Critical patent/EP0740488A2/fr
Publication of EP0740488A3 publication Critical patent/EP0740488A3/fr
Withdrawn legal-status Critical Current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
    • H05B3/84—Heating arrangements specially adapted for transparent or reflecting areas, e.g. for demisting or de-icing windows, mirrors or vehicle windshields
    • H05B3/86—Heating arrangements specially adapted for transparent or reflecting areas, e.g. for demisting or de-icing windows, mirrors or vehicle windshields the heating conductors being embedded in the transparent or reflecting material
    • 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
    • H05B2203/017—Manufacturing methods or apparatus for heaters

Definitions

  • the invention relates to a method and a device for producing an electrically heatable window, in particular a flexible plastic window for use as a rear window in motor vehicles with soft, foldable tops.
  • an electrically heatable, flexible, transparent pane which has a large number of heating filaments running in parallel.
  • the heating threads are interwoven at regular intervals along their length with supporting threads and at their ends with current carrying threads. At least some of the support threads are electrically and thermally conductive and are in conductive contact with the heating threads at the crossing points. The remaining support threads are not conductive.
  • the heating grille is embedded in a pane body made of thermoplastic plastic.
  • electrically conductive contact strips are applied to a continuously provided first film.
  • the contact strips expediently consist of a braided copper wire hose.
  • the advantage of the copper wire hose is that it is easy to manufacture and, due to its geometrical dimensions due to the braiding, it is very well suited for making contact with heating wires.
  • the contact strips can also be designed differently.
  • a continuously provided second film is applied to the first film in such a way that the contact strips are enclosed by the two films. As a result, the contact strips are fixed in their position.
  • the two foils are under surface pressure and temperature pressed so that a composite film forming the disc is produced.
  • electrically conductive heating wires continuously provided are introduced between the two foils. The heating wires are introduced in such a way that they are each unwound from a supply roll under mechanical tension and the tension is maintained at least until the two foils are brought together.
  • the electrically conductive heating wires are located between the two foils, on the one hand they come into contact with the contact strips, and on the other hand they are fixed in their position.
  • the tensile stress acting on the heating wires can be generated in such a way that the supply rolls can only be moved with the application of a frictional force.
  • the tensile force is generated in that the heating wires are located between the continuously advancing foils, so that they are unwound from the supply rolls against the frictional force at the same speed as the foils.
  • the heating wires are thus introduced into the disk in a simple manner without an additional work step, which has an advantageous effect on the production costs.
  • the heating wires can be guided through a guide, by means of which the distance between the heating wires can also be adjusted.
  • the tensile stress can be generated in a simple manner by frictional forces in the bearings of the supply rolls. However, separate tendons can also be provided if this should be appropriate.
  • the composite film can be divided such that from the continuous web Cut out panes with the geometrical dimensions depending on the place of use.
  • a control is expediently provided, by means of which the cutting device is moved with the composite film during the cutting process.
  • a soft PVC has been found to be the material for the foils. This minimizes the material costs.
  • a thermoplastic polyurethane also gave very good results, particularly with regard to scratch resistance.
  • a double belt press is advantageously provided for pressing the two foils.
  • the two films are wound on supply rolls arranged in front of the entry zone of the double belt press.
  • a laying device for applying the contact strip is arranged between the supply roll of the first film and the entry zone of the double belt press.
  • the contact strips are placed on the first film in accordance with a predetermined shape.
  • a braiding device can be provided, by means of which a wire hose is braided, which serves as a contact strip. Copper has proven to be a particularly suitable material.
  • a wire magazine is provided in front of the inlet zone of the double belt press, from which the heating wires are guided between the two foils.
  • the wire magazine expediently has a coil for each heating wire, which is designed such that the respective heating wire against one the mechanical tensile force must be handled by it.
  • the mechanical tension in the heating wires can be regulated before unwinding.
  • Means can be provided for positioning the wires, which fix the distance between the wires.
  • the distance between the wires depends on the disk thickness and can be adapted very easily by the arrangement according to the invention. For 1 mm thick PVC panes, a distance of 10 mm has proven to be sufficient to heat the pane sufficiently without the risk of local overheating. For reasons of visibility, a larger number of thinner heating wires can be recommended.
  • the heating wires By embedding the heating wires in the two foils and pressing the two foils together, the heating wires are pressed onto the contact strips in such a way that good electrical contact is formed.
  • the electrical connection is improved in particular by using a wire mesh as a contact strip.
  • the wire mesh is laid on the first film at a short distance from the edge of the pane.
  • the deposit can be done by means of an NC-controlled device or, if necessary, by hand using a template.
  • a device can be arranged behind the outlet zone of the double belt press, by means of which a layer is applied to the endless belts of the double belt press, which layer bonds to the films when the two films are pressed.
  • the layer can, for example, be a scratch-resistant or tinted layer.
  • a hydrophilic layer is also conceivable to make the fitting invisible.
  • the layer can be applied to the endless belt of the double belt press using a screen printing drum and is transferred to the surface of the film during pressing.
  • the layer can also be applied only at those locations where, for example, parts of the contact strips are to be covered optically.
  • the present invention achieves the advantage that heatable panes can be produced in one operation, which has a very favorable effect on costs, and that the panes are more transparent than previously known, heatable, flexible panes.
  • an arrangement for producing electrically heatable panes has a double belt press 4, in which a first film 2a and a second film 2b, which are unwound from a first supply roll 10a and a second supply roll 10b, are pressed together become.
  • contact strips 3 are placed by means of a laying device 8, which serve to supply electrical current to heating wires 1 during the use of the disks.
  • the heating wires 1 are unwound from supply rolls of a wire magazine 7.
  • the supply rolls are designed so that the heating wires can only be unwound from the supply rolls against a predetermined tensile stress.
  • means 9 are provided which serve to position the heating wires 1.
  • the means 1 can be a comb or a roller. The correct distance between the wires can be set using the comb or the roller.
  • means 5 are provided, by means of which a layer can be applied to the endless belts of the double belt press.
  • the layer combines with the two foils when the two foils 2a, 2b are pressed together. As a result, the pane can be refined with little effort.
  • a cutting device 6 is provided behind the outlet zone of the double belt press 4, by means of which the composite film is divided into individual disks.
  • the cutting device 6 expediently has a control, as a result of which the cutting device can be moved with the composite film during the cutting process. This ensures that the manufacturing process can be carried out continuously and an intermediate store is not required.

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  • Surface Heating Bodies (AREA)
EP96106774A 1995-04-27 1996-04-29 Méthode et appareillage pour la fabrication de vitrages pouvant être chauffés électriquement Withdrawn EP0740488A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1995114856 DE19514856A1 (de) 1995-04-27 1995-04-27 Verfahren und Vorrichtung zur Herstellung einer elektrisch beheizbaren Scheibe
DE19514856 1995-04-27

Publications (2)

Publication Number Publication Date
EP0740488A2 true EP0740488A2 (fr) 1996-10-30
EP0740488A3 EP0740488A3 (fr) 1997-04-02

Family

ID=7760124

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96106774A Withdrawn EP0740488A3 (fr) 1995-04-27 1996-04-29 Méthode et appareillage pour la fabrication de vitrages pouvant être chauffés électriquement

Country Status (2)

Country Link
EP (1) EP0740488A3 (fr)
DE (1) DE19514856A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006105887A1 (fr) * 2005-04-06 2006-10-12 Bayer Materialscience Ag Procede de fabrication d'une pellicule

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE900119C (de) * 1941-04-04 1953-12-21 Walther Bethge Verfahren zur Herstellung elektrisch heizbarer Anordnungen, insbesondere Heizfolien, fuer Kochgeraete u. dgl.
DE870475C (de) * 1943-03-10 1953-03-12 Detag Verfahren zum Herstellen von Mehrschichtenglas mit in die Zwischenschicht eingelegten Heizdraehten
AT185906B (de) * 1951-02-06 1956-06-25 Walther Bethge Elektrischer Flächenheizkörper
BE634939A (fr) * 1962-07-16 1900-01-01
DE2127693B2 (de) * 1971-06-04 1973-07-12 Verfahren und vorrichtung zur herstellung von insbesondere elektrisch beheizbaren verbundglasscheiben mit in einer thermoplastischen zwischenfolie angeordneten draehten
CH531296A (de) * 1971-12-31 1972-11-30 Verres Ind Sa Einrichtung zum Verlegen einer Schar Drähte in eine Masse
GB2091528B (en) * 1981-01-14 1984-11-07 Boussois Sa Heatable panels
DE3506011A1 (de) * 1985-02-21 1986-08-21 VEGLA Vereinigte Glaswerke GmbH, 5100 Aachen Verfahren zum herstellen einer mehrschichtigen elekrisch beheizbaren sichtscheibe aus kunststoff
DE4019357C1 (en) * 1990-06-18 1991-08-01 G. Bopp & Co Ag, Zuerich, Ch Flexible, electrically heatable, transparent panel - has heating grid embedded in sheet of thermoplastic material suitable for rear window of convertible car
DE4126533A1 (de) * 1991-08-10 1993-02-11 Ver Glaswerke Gmbh Verfahren zum kontaktieren von elektrisch heizbaren glasscheiben mit transparenten heizwiderstandsschichten

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006105887A1 (fr) * 2005-04-06 2006-10-12 Bayer Materialscience Ag Procede de fabrication d'une pellicule

Also Published As

Publication number Publication date
EP0740488A3 (fr) 1997-04-02
DE19514856A1 (de) 1996-10-31

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