EP1310929B1 - Glazing element with incorporated electric conductors structure - Google Patents

Abstract

Pane element comprises at least one pre-tensioned glass pane having on its surface an electrical conductor structure with electrical connection lines leading to the edge of the glass pane. The glass pane is a component of an insulating glass element consisting of at least one further pane and a frame-like spacer. The spacer is connected by an adhesive strip to the surface of the glass pane provided with the conductor structure and crosses the electrical connections in the region insulated with a thin, insulating, protective layer. In the crossing region on a pre-determined path the adhesive strip consists of a material having a higher electrical insulating activity than the rest of the adhesive strip. <??>Independent claims are also included for processes for producing the above pane element. Preferred Features: At least one further thin, insulating, protective layer made of an electrically non-conducting material is provided between the connections and the spacer, especially between the connections and the adhesive strip.

Description

• il est prévu une mince couche de protection non conductrice isolant électriquement ces lignes de raccordement l'une de l'autre et sur sa surface située à l'opposé de la vitre,
• la vitre est un composant d'un élément de vitrage isolant formé d'au moins une autre vitre et d'une pièce d'écartement en forme de cadre,
• la pièce d'écartement assemblée à la surface de la vitre portant la structure de conducteurs au moyen d'une ligne de colle croise les raccords électriques dans la zone (zone de croisement) isolée au moyen de la couche de protection.

The invention relates to a glazing element, in particular to an alarm window. It is a glazing element with at least one tempered glass, on the surface of which there is provided a structure of electrical conductors, whose electrical connection lines are led to the edge of the glass, in which

• there is provided a thin non-conductive protective layer electrically insulating these connecting lines from each other and on its surface located opposite the glass,
• the window is a component of an insulating glazing element formed of at least one other window and a frame-shaped spacer,
• the spacing piece assembled on the surface of the window carrying the conductor structure by means of a line of glue crosses the electrical connections in the zone (crossing zone) isolated by means of the protective layer.

It is known from EP-B1-0 058 348, to form a alarm glass from at least two panes assembled one to the other in insulating glazing with a shaped spacer frame, to provide a structure of electrical conductors on at least one of the windows and soak the window. The destruction of the conductor structure by breakage of the glass interrupts an electrical circuit of standby and triggers an alarm. of the electrical connection lines of the conductor structure must be carried out, out of space intermediate insulation glazing between the spacer and the window. In this case, they must remain isolated to the point from an electric point of view. Similarly, the tightness of the space included between the panes of the insulating glass must not be compromised.

In the state of the art mentioned above, the conductor structure is, in addition to its sections of lines covered by the piece spreader, preferably made from a baking dough Electrically conductive, high silver content, which is applied to the glass by screen printing. Then, a layer of enamel protection is printed in a second plane as at least on the sections of lines to be covered by the spacer. When heating the windows for quenching, both layers are cooked, the protective layer providing electrical insulation after cooking. So, from a on the other hand one must surely reach an electrical insulation of the conductor structure against unforeseen contact with the room spacing (metallic) and on the other hand the lines are protected electric against corrosive influences.

The electrical resistance must be greater than 10 MΩ for the assembly consisting of the aforementioned insulating enamel layer, the glue and possibly a secondary sealing material added to the outer perimeter. The quality of the insulation ("Insulation quality") between the alarm loop and the room distance is determined in total by the deposited materials between them (enamel covering layer or the like, lines of glue). There is always, in the case of the construction, the possibility that the spacer is at proximity to other metallic structures, for example supports of the glazing element in a frame of a facade, and electric bridges should be avoided.

In practice, the coated enamel coating layers - the most of the time in continuous industrial installations - have small pores, which may contain water. The electrical resistance of the insulation can thus be substantially scaled down.

We have also tried to obtain better properties insulation by depositing a layer of multiple protection on the fittings. The desired result is however not achieved no longer this way, because even overprinting multiple does not reliably exclude the formation of pores during of cooking. Apart from this, this process requires even more of time.

As a result of increasing demands on quality insulation (insulation levels or insulation resistance) of such electrical connections - who can in case of failure lead to nuisance alarms - the glues used so far in insulating glazing elements for the frame spacing, ie in general colored butyl lines in black with soot for visual reasons, do not show no longer sufficiently high isolation levels and contribute too little to the quality of insulation. Precisely in the region of the intersection of the connections and the spacer, the glue line is reduced to a thickness a few tenths of a millimeter when pressing the laminate, so there must be very high levels of insulation there electric.

If installed, the insulation resistance can still be more highly degraded by wet conditions or wet. This particularly concerns sealing materials secondary located outside because of their expanses relatively large.

Of course, we could color the mass of the glue with others dyes, however a reconversion of mass production, respectively separate manufacture of smaller quantities with other dyes, would mean high costs, which are refused by glue manufacturers and not accepted by the customers.

In DE-C1-197 48 868, it is proposed to carry out insulation in the area concerned with glass, which would be either deposited in the form of platelets be applied in the form of a paste. Glass insulation must melt during quenching. In this solution too, the conductive silver paste must first be dried. There is some risk of degradation mechanical sections of lines to cover.

The document DE-C1-199 60 450 presents an insulation of the sections lines using a layer of assembled plastic mechanically or materially on the surface of the glass after the tempering, which may for example consist of a thin sheet. In a preferred embodiment, the thin insulating sheet forms at the same time time a support sheet for fittings made from a flat conductor.

By the document DE-C2-40 25 166, it is in principle known to smooth the junction area between the beginning and the end in a cord extruded profile at the periphery on a window pane, in first cutting this junction area and then inserting a patch of identical profile fitting into the interval. However, we attach importance here only exactly the same properties of the inserted part with the remainder of the profiled bead, and the problem of electrical insulation does not arise.

The object of the invention is to propose another variant of a glazing element of the type mentioned in the introduction, relatively simple to manufacture, with electrical insulation improved. It is also necessary to indicate a process for the manufacture such glazing elements.

In accordance with the invention, this objective is achieved, as far as glazing element, since the glue line is dials, over a predetermined distance in the zone of crossing, of a material with an electrical insulation effect significantly increased relative to the material the rest of the line of glue. The features of the independent claims 11 and 12 indicate corresponding methods. The characteristics of claims respectively subordinate to the claims independent devices have advantageous variants of these objects.

When, according to the invention, the region of spacer frame, which crosses the connections led outwards (subsequently crossover area), a stretch of the glue line in one material with very high levels of electrical insulation, we can also use, on most of the contour insulating glazing elements provided with the structure of conductors, the bonding masses stained with soot usual so far. The condition is naturally that at the junction points, homogeneous junctions are performed, practically seamless, particularly with regard to material compatibility and adhesion as well as sections of lines of glue between them that of the section inserted on the surface glass, fittings and spacer frame. The tightness of the laminated insulation glazing must be provided as before, in order to to also prevent any long-term damage for example by moisture penetration.

In the best case, this measure can meet the requirements the quality of insulation, so that the line of glue highly insulating form itself the protective layer (single) in the crossing zone with the fittings, even if it is only a few tenths of a millimeter thick. However, it may be necessary or interesting to there extra layers of protection, depending on the state of the aforementioned technique (therefore intermediate layers of enamel or glass, plastic sheets, etc.). These layers can be applied directly to the fittings. In principle, one could however also drown them in the line of glue or apply them on the spacer itself, if the gas tightness required for the insulating glazing element remains assured in this area.

Said crossing zone is generally arranged in a corner of the glazing element, because that's where we can more easily find room for contacting electrical external fittings of the conductor structure. In case of need, we can naturally foresee it in one place as well as to provide for more than one such connection areas in a glazing element, which must then be each electrically isolated in the same way.

A glazing element and the implementation of the method according to the invention will be described in more detail below. For even more precise details, it is explicitly done reference to document DE-C1-199 60 450, particularly to figures of it.

For the manufacture of a double glazed insulating alarm glazing with a glass of tempered silicate glass (Floatglas) and a other window (for example also in Floatglas or in a material suitable plastic such as polycarbonate), we first print on a main face of the glass to soak a structure of conductors (preferably by screen printing), the connections of which extend to the edge of this window, respectively of the surface thereof. At its end, it is as a general rule, connection faces, that is to say brazing areas, which lie flat on the surface of the glass, over a certain width, parallel to the room as shown in DE-C1-199 60 450 already mentioned. To these, we connect later extension lines for the connection of the structure of conductors to an external circuit not shown, for example a alarm device or radio installation using or configuring the conductor structure as an antenna.

Parts of the conductor structure adjacent to the room spacing are oriented parallel to it, at a distance large enough to exclude with certainty a conductive electrical contact with the spacer. Similarly, the different electrical polarity connections, led to outside parallel to each other, respect a distance a few millimeters apart.

The entire conductor structure, in addition to the lines of connection and brazing areas, is preferably deposited by serigraphy of a ceramic paste to be baked into a material of brazing with a high silver content, with a thickness of approximately 0.01 to 0.03 millimeters. This dough is cooked by heating to high temperatures required for tempering the glass. The electrical conductivity is quite sufficient for the cases described, even with such small sections cross.

The spacer itself is usually composed of a hollow profile filled with a drying agent. This one moves metal compound (eg aluminum) or material plastic.

Before assembling both windows using a room spacing in the form of a frame, it is appropriate to apply layers, respectively lines, glue of a thickness also as uniform as possible. These can be applied either directly on the faces of the panes along the region of their contact with the spacer is (preferably) on the spacer itself. In most cases, the lines of glue are made of butyl rubber, which adheres Remarkable and durable way both to glass surfaces than metal and which can be uninterruptedly deposited by extrusion in the form of a cord or line on the face in question pieces.

In the crossing zone of the glue line, which crosses the fittings of the conductor structure, the material is now again removed, for example by cutting a piece in the continuous line.

Alternatively, the interval can also be produced first necessary by locally stopping the deposit operation, respectively extrusion. We can for example start this last on a first side of the crossing zone, at a certain distance from the neighboring joint and, after a path around the perimeter of the frame, finish it on the other side of the area, also at a distance from the next fitting.

In this zone, respectively these zones, of crossing, one provide a sufficient distance from the spacer and its bonding up to the edge of the glass, respectively a exceeding the face of the window beyond the face covered by the spacer, in order to have a place sufficient for the electrical contact of the fittings of the structure of conductors led out of space circumscribed by the spacer, in a position visually hidden. This zone as well as the contact zones of the glue with the glass are often still visually masked at opaque printing on the surface, which is directly on the face of the windows, below the connections. This printing can also be done by screen printing and cooking. It can also serve as a basis for potential adhesion adjuvants ("primer").

When pressing windows in conventional construction, the Glue line is heavily compressed. In these circumstances, the material could also flow laterally outwards, below the spacer, and in the circumstances disadvantageous even touch said connecting terminals and create a (too) insulating connection between the terminal lug and the spacer. To also prevent this effect, the size of the gap, respectively the area with an adhesive highly insulating is, for safety, chosen according to the size of the terminal lugs, respectively the faces of brazing. In a case of realization in which the faces of total length of 45 mm, the area to be provided or to put on a highly insulating adhesive mass is worth about 50 mm.

In each case, the adhesive having high levels electrical insulation used to fill the gap in the "normal" glue line must be compatible with this one. It is precisely in the junctions that the tightness of the line of finished glue must remain assured against gas penetration in laminated insulation glazing. We can consider this as creating seamless junctions between most of the glue line and the inserted section (s) as needed in the crossing zone. Naturally, there remains heterogeneity in the junctions even after crushing the line of glue, which may become visible by inspection more careful even if the two colors are identical materials; however, this should in no way lead to a decrease of the tightness.

In the simplest case, it is possible to use for example a butyl material without soot, either unstained or colored with other dyes. In this way, nevertheless also with others comparable adhesives, one can create without much expense a good homogeneity in the junctions on both sides of said zone with the peripheral glue line.

The piece to be inserted can be extruded in situ or inserted as a prefabricated insert. The case where appropriate, the junctions with the rest of the line must then to be smoothed.

Of course, the reverse order can also be followed during the manufacture, by first making the crossing zone of the glue line with the high electrical insulation material and in then completing the rest of the line of glue.

This total expenditure slightly increased compared to customary manufacturing until now is only necessary on the side of the spacer, which is facing the window quenched provided with the conductor structure. The room spacer can be assembled to the other glass in the way tried and tested with a line of peripheral glue, which should not not have any particular electrical insulation properties.

When the glue lines on both sides are completed, one join the windows and the spacer, to assemble these three pieces to each other sealingly by gluing. In the occurrence, cords or lines of glue are pressed in relatively thin layers, which come together in sticky intimately to the surfaces of the windows and the spacer. The shape of the cross section of the sections of the glue line is therefore irrelevant, only to the extent that there is each plot location enough material available for seal the glued joint.

We can then still deposit a sealing compound (secondary) additional, for example Thiokol, polysulfide, silicone or polyurethane, outside around the spacer and adhesive layers, to create an additional seal of the interior space of the glazing, and also to seal the faces external connections. The electrical insulation properties of this sealing mass are certainly similar to those of the glue itself, however this sealing material secondary structure retains a relatively large thickness, such so the problem of lack of electrical insulation of a extraordinarily low layer thickness can not land right here.

Claims (13)

1. Glazing element with at least one toughened pane, on the surface of which a structure of electrical conductors is provided, whose electrical connection lines lead towards the edge of the pane, in which

   a thin non-conducting protective layer is provided, electrically insulating these connection lines from one another and on its surface situated opposite the pane,

   the pane is a component of an insulating glazing element made of at least one other pane and of a separating piece in the form of a frame,

   the separating piece, assembled on the surface of the pane carrying the structure of conductors by means of a line of adhesive, crosses the electrical links in the zone (crossing zone) insulated by means of the protective layer,

   characterized in that the line of adhesive consists, over a predetermined distance in the crossing zone, of a material with an electrical insulation effect that is considerably greater than the material of the rest of the line of adhesive.
2. Glazing element according to Claim 1, in which the total insulation between the links and the separating piece have an electrical resistance of at least 10 MΩ.
3. Glazing element according to Claim 1 or 2, in which, between the links and the separating piece, in particular between the links and the line of adhesive, at least one additional thin insulating layer is provided in an electrically non-conducting material.
4. Glazing element according to Claim 3, in which the additional layer consists of an electrically non-conducting glass frit baked onto the pane.
5. Glazing element according to Claim 3, in which the additional layer consists of a thin plastic which has been fixed onto the separating piece or onto the pane after toughening.
6. Glazing element according to any one of the preceding claims, characterized in that the segment of the line of adhesive provided in the crossing zone is extruded in situ between the ends of the adjacent line of adhesive.
7. Glazing element according to any one of Claims 1 to 5, characterized in that the segment of the line of adhesive consisting of a prefabricated line, provided in the crossing zone, is inserted between the ends of the adjacent line of adhesive.
8. Glazing element according to any one of the preceding claims, characterized in that the segment of the line of adhesive provided in the crossing zone consists, over a predetermined distance extending either side beyond the links, of the material with a considerably increased electrical insulation effect.
9. Glazing element according to any one of the preceding claims, whose links are provided with flat connection zones situated on the outside of the face of the pane circumscribed by the separating piece, characterized in that the segment of the line of adhesive provided in the crossing zone consists, over a predetermined distance extending either side beyond the links and the said connection zones, of the material with the considerably increased electrical insulation effect.
10. Glazing element according to any one of the preceding claims, characterized in that an additional (secondary) quantity of sealant covers at the periphery the face facing towards the outside of the separating piece on the outer edge of the glazing element.
11. Method for manufacturing a glazing element, in particular an alarm glass, which comprises at least one toughened pane, a structure of electrically conducting conductors printed on the latter and the electrical connection lines of the latter leading towards the edge of the pane and a separating piece and another pane, in which the connection lines are covered, at least in a crossing zone covered by the separating piece, by an electrically non-conducting protective layer and the separating piece is bonded to the surface of the pane with the aid of a line of adhesive in a material with high electrical resistance, characterized by the following steps:

    either the line of adhesive is interrupted when it is deposited in the zone covering the links or a piece of the line of adhesive is cut out after it has been deposited;

    in the region of the interruption, adhesive material with a particularly high electrical resistance is used to replace the material of the rest of the line of adhesive, seamless joins being created either side of the crossing zone;

    the separating piece and the other pane are assembled with the toughened pane into an insulating glazing element in the usual manner on the face of the toughened pane provided with the structure of conductors.
12. Method for manufacturing a glazing element, in particular an alarm glass, which comprises at least one toughened glass, a structure of electrically conducting conductors printed on the latter and the electrical connection lines of the latter leading towards the edge of the pane and a separating piece and another pane, in which the connection lines are covered, at least in a crossing zone covered by the separating piece, by an electrically non-conducting protective layer and the separating piece is bonded to the surface of the pane with the aid of a line of adhesive in a material with high electrical resistance, characterized by the following steps:

    in the crossing zone, a segment of the line of adhesive is created consisting of an adhesive material having a particularly high electrical resistance;

    the rest of the line of adhesive is deposited on the periphery, by creating seamless joins either side of the crossing zone;

    the separating piece and the other pane are assembled with the toughened pane into an insulating glazing element in the usual manner on the face of the toughened pane provided with the structure of conductors.
13. Method according to Claim 11 or 12, characterized in that another quantity of sealant is finally deposited on the outside around the whole outer edge of the separating piece, before or after the links are placed in external electrical contact.