DE10355448A1 - Heatable three-dimensional glass pane used as a vehicle windscreen comprises a layer made from a semiconductor material and/or a metal oxide as heating layer, and an organic or inorganic protective layer - Google Patents

Abstract

Heatable three-dimensional glass pane comprises a layer made from a semiconductor material and/or a metal oxide as heating layer, and an organic or inorganic protective layer. Independent claims are also included for the following: (1) process for the production of the heatable three-dimensional glass pane; and (2) device for carrying out the heatable three-dimensional glass pane.

Description

method and facilities for printing and / or color treatment three-dimensionally curved glass and / or plastic discs in particular from car windows.

Currently is used in the manufacture of automobile windows, e.g. the back walls and side windows for the decor prints and for the functional prints mainly used the screen printing technique. To use this technique must the disk should be flat, i. the printing takes place before forming (Bending and biasing). This is a very big disadvantage of the screen printing technique. In addition, the screen printing technique is very complicated and therefore is expensive. Other disadvantages include the high cost the production of sieve slides and sieves, the storage of sieve stocks in production, cleaning of used sieves, disposal the old, worn sieves, the fluctuating quality of screen printing inks and the fluctuating quality of the printed image. With the multiplicity of these disadvantages it is logically that the most diverse attempts were made, others Introduce procedure.

The permanent marking of glass sheets by means of an inkjet printer, as in DE 39 40 749 described was a possibility. Further, the application of ink to the glass surface with a predetermined pattern by non-contact electrostatic ink jet printing and then heating the glass sheet to allow the ink to diffuse into the glass in the EP 0 462 720 described. However, even these described methods still have the disadvantage that the deformation of the glass pane also takes place only after the printing process.

In the DE 299 23 659 U1 a printing or coating device is proposed, with the particular three-dimensional in space curved surfaces can be printed or coated. For this purpose, a stretchable transfer material, for example, an endless rubber band is applied by means of rollers with a toner and then transferred with a stamp on the glass. The field of application of this device was intended in particular for curved oven front panes and other 3D-deformed glass panes.

Of the Invention is based on the object, a method for printing already bent, i. of arched glass panes in terms of decor and functional pressure and corresponding devices for carrying out the Process, which overcomes the disadvantages of the known processes, especially avoid the screen printing technique.

With the invention is achieved that compared to the current state of Technology is a significant quality improvement is reached. There are lower bending deviations from the Target data reached. The homogeneous heat absorption of unprinted discs improves the bending result by avoiding unwanted tension and compressive stress areas. Bending bends in the glass, by adhesive effects after pressing, can not occur. The litigation in the oven is based exclusively on the needs disk forming (bending and tempering) and not the quality of the color sintering. In the production of heating panels on glass panels occur smaller Fluctuations in the terminal resistance and in the defrosting behavior of the heating field on. The color application, the color sintering and the resistance measurement done online in a row. about leave a feedback the results directly for use subsequent discs. This reduces the fluctuation range in the terminal resistance. Due to the layer thickness variation, conductance fluctuations can be achieved compensate for the silver color. Also the defrosting behavior of a heating picture can be explained about geometry changes of filaments in the tolerance range. In addition will a better optical quality the glass pane by lower bending deviations from the target data reached. Avoidance of alternating bends both improve the transmission optics as well as the reflection optics considerably. Next the raised quality results Cost-saving effects are achieved. There are much shorter development times new disc types possible. A print image change is possible with a mouse click. There is no correlation between color choice and bending result to be observed. The above-described disadvantages of the screen printing process all account. There are significant cost savings for the same yield losses achieved in the bending and tempering process, since the discs are still unprinted are. Reduce the yield losses after the bending and tempering process itself, there errors, in the direct connection with the color sintering stand, no longer occur. Possible Heating field resistance tolerances decrease.

Further advantages result from an expansion of the production possibilities. Printing up to the edge of the window is possible. A color change between different colors is feasible. Local differences in the layer thickness can be realized. Extensions are also possible with functional pressure, such as layer thickness fluctuations, for example, to influence the defrosting behavior by means of corresponding resistance values. It can be a in individual disc tracking by changing the stamps, such as sequential numbering or date and time. By mixing several silver pastes, the conductivity of the silver paste is controllable, and thus also the defrost behavior is controllable hereby.

advantageous Embodiments of the invention with respect to the method are in the claims 2 to 5 listed. Advantageous embodiments of the invention of the device are in the claims 7 to 9 listed. In the development according to claim 2 z. B. by the use laser technology treats the layers or structures to be produced. According to claim 3, process steps with the use of the device described according to claim 8. To improve and maintain environmental conditions become according to claim 4 paint residues in a reprocessing plant filtered out. In the development according to claim 5 via a Loop a constant Evaluation of the paint jobs carried out and thus a constant approach to the desired Setpoints, what the above-mentioned benefits of quality improvement or the avoidance of rejects over entire lot sizes. The difference between claims 6 and 7 is in the nature of Move. Once the object to be printed is moved. In the other Case leads the printhead a spatial Movement through. In the development of the device according to claim 8 are loading and unloading robots with a rondel or with a horizontal conveyor line coupled. In individual stations, the process steps take place. In the development according to claim 9, a feedback is provided. The reached Actual values are compared with the setpoints and it becomes an immediate one Influencing the printing process of the next glass pane allows. Committee is thus almost completely avoided.

One embodiment The invention will be explained in more detail with reference to the drawing. Show it:

1 the schematic structure of the devices for printing and / or color treatment of three-dimensionally curved glass sheets and

2 the schematic representation of the production stages.

For the process for producing printed and / or color-treated glass panes, wherein the printing or the color treatment takes place only after the bending and tempering of the glass panes, the following device is used. A loading and unloading robot 1 is with a rondel 2 with Fixiersaugern for the glass and one next to the Rondell 2 standing horizontal conveyor line 3 coupled. On the rondel 2 are the stations loading and unloading station 2.1 , Centering station 2.2 with a rotating and tilting mimic and an optical measurement, the inking station 2.3 , the station of the decorative printing brand 2.4 by means of photochemical process, the washing station 2.5 and the drying station 2.6 arranged. The horizontal conveyor line 3 the stations have loading and centering 3.1 , Heating field application station 3.2 , Einsinterungsstation 3.3 for the silver paste, application station of the terminals with measuring and evaluation station 3.4 of the total resistance, measuring and evaluation station 3.5 for the coating thickness measurement of all heating filaments and the de-coating station 3.6 , This station is equipped with a decommissioning robot 4 coupled. All measuring and evaluation stations 3.4 . 3.5 have a feedback to the previous workstations by means of a control loop.

The complete method is characterized in the embodiment by the following steps. The already bent and tempered glass pane is controlled by a loading and unloading robot 1 taken from a magazine and in a loading and unloading station 2.1 on a roundabout 2 stored. In a subsequent centering station 2.2 The glass pane is optically measured, aligned and fixed. Subsequently, by means of a photolithographic process, a full-surface application of paint to the glass pane in an inking station 2.3 , In the following station, the decor pressure burn-in station 2.4 , takes place by means of a photochemical process of Dekordruckeinbrand. In another two stations on the roundabout 2 is in a wash station 2.5 removed with deionized water the unneeded paint. The thus cleaned glass pane is in the subsequent drying station 2.6 dried. For drying and baking, UV lasers and / or LCDs are used, and high-performance beamer for exposure. By means of the loading and unloading robot 1 Now the glass pane on the horizontal conveyor line 3 the station loading and centering 3.1 to hand over. While maintaining the alignment in the following station, the Heizfeldauftragstation 3.2 or inkjet station 3.2 applied the heating field with the inkjet method. For this purpose, special colors or pastes, such as

Silver paste, used. After the inkjet station 3.2 is a Einsinterungsstation 3.3 intended for sintering the silver paste. In the following station, the order station of the terminals with measuring and evaluation station 3.4 the connection terminals for the heating field are applied and at the same time the total wi is measured out the status of the heating field and evaluation with specified setpoints. The evaluation unit is marked A in the drawing. From this unit there is a feedback to the InkJet station 3.2 , It is thus given a control loop, with which it is possible to respond immediately to deviations, ie in the production of the follow-up glass pane, the necessary changes already included. Before the de-fumigation station 3.6 can still another measuring and evaluation station 3.5 be arranged for the layer thickness measurement of all filaments. This also serves to further ensure a high quality production. Also from this station 3.5 is a loop to the inkjet station 3.2 intended. A decommissioning robot 4 takes the finished glass from the horizontal conveyor line 3 and put them in a magazine.

1

Feeding and picking robots

2

Rondell

3

Horizontal conveying line

2.1

loading and unloading station

2.2

centering

2.3

Painting station

2.4

Dekordruckeinbrandstation

2.5

washing station

2.6

drying station

3.1

station Feeding and centering

3.2

Heizfeldauftragstation

3.3

Einsinterungsstation

3.4

order station the connection terminals with measuring and evaluation station

3.5

measurement and evaluation station for the layer thickness measurement

3.6

Entschickungsstation

4

Entschickungsroboter

A

evaluation station

Claims (9)

Process for printing and / or color treatment of three-dimensionally curved glass and / or plastic sheets, characterized in that in the already three-dimensionally deformed glass sheet of printing or inking for functional or decorative prints by means of inkjet method and laser method and / or Photolithographic process and laser process takes place. Method according to claim 1, characterized in that that by means of UV laser and / or LCD and the exposure with a Hochleistungsbeamer the layers or structures to be generated be dried or baked. Method according to one of the preceding claims, characterized in that the curved and tempered glass pane in a special centering station ( 2.2 ) is optically measured and aligned to a desired space and fixed, then the color over the entire surface in a paint application station by means of a photolithographic process ( 2.3 ) is applied to the glass sheet and dried and sintered according to the desired geometric data by means of a laser and subsequently in a washing station ( 2.5 ) with demineralized water, the unused color is removed, the cleaned glass sheet then dried and while maintaining the alignment over a horizontal conveyor line ( 3 ) of the InkJet Station ( 3.2 ) is fed to print special colors or pastes, such as a silver paste for a heating field and then einintern. Method according to claim 3, characterized that filtered out the paint residues in a reprocessing plant become. Method according to one of claims 3 or 4, characterized in that a plotter station next to the inkjet station ( 3.2 ) constantly information and evaluations on previous paint jobs done and thus a continuous adjustment is possible. Device for performing the inkjet method according to one of the preceding claims, characterized that the inkjet print head on a pivot axis about a Shooting table for the glass plate to be printed is arranged, wherein the receiving table in the x, y and z axes is mobile. Device for performing the inkjet method according to one of the preceding claims, characterized that the inkjet print head is mounted on a 5-axis robot and the glass to be printed in a corresponding holding device centered and fixed. Device for carrying out the method according to claim 1 to 5, characterized in that a loading and unloading robot ( 1 ) with a rondel ( 2 ) with Fixiersaugern for the glass panes and a Horizontalföderstrecke ( 3 ) and the roundel ( 2 ) a loading and unloading station ( 2.1 ), a centering station ( 2.2 ) with a rotating and tilting mimic and an optical measurement, furthermore an inking station ( 2.3 ) with a laser device, a Dekordruckeinbrandstation ( 2.4 ), a washing station ( 2.5 ), a drying station ( 2.6 ) and the horizontal conveyor line ( 3 ) a station loading and centering ( 3.1 ), a Heizfeldauftragstation ( 3.2 ), a sintering station ( 3.3 ) for the silver paste, an application station of the terminals with measuring and evaluation station ( 3.4 ) of the total resistance, a measuring and evaluation station ( 3.5 ) for the coating thickness measurement of all Filaments and a decompression station ( 3.6 ), coupled with a decommissioning robot ( 4 ) owns. Device according to claim 8, characterized in that after the heating field application station ( 3.2 ) as an inkjet station with a laser device or another suitable station one or more measurement and evaluation stations ( 3.4 . 3.5 ) are arranged for detection and evaluation with predetermined setpoints, such as dimensional accuracy, resistance values, etc., which have a feedback via a control circuit to the inkjet station.