WO2024126584A2

WO2024126584A2 - Device and method for removing coatings from panes made of coated single- or multi-layer glass, in particular composite glass or composite safety glass

Info

Publication number: WO2024126584A2
Application number: PCT/EP2023/085608
Authority: WO
Inventors: Daniel SCHOERGHUBER; Jakob GANGL
Original assignee: Lisec Austria Gmbh
Priority date: 2022-12-16
Filing date: 2023-12-13
Publication date: 2024-06-20
Also published as: DE102022133672A1

Abstract

The invention relates to a device (1) for removing coatings from panes (3) made of coated single- or multi-layer glass, in particular composite glass or composite safety glass, comprising at least one coating-removing tool (2) for removing a coating (5) on at least one of two opposing main surfaces of a pane (3) made of a coated single- or multi-layer glass in order to form a coating-removal zone (Z), wherein the at least one coating-removing tool (2) and the main surface of the pane (3) can be positioned relative to each other and can be moved relative to each other in a progression direction (S) of the grinding process, and the at least one coating-removing tool (2) preferably has a grinding disc (2a) which can be rotated; and a sensor (4) for detecting the coating-removal zone (Z), preferably after the machining process using the at least one coating-removing tool (2). The device (1) for removing coatings from panes (3) is configured so as to position the at least one coating-removing tool (2), preferably the grinding disc (2a) which can be rotated, and the main surface of the pane (3) relative to each other and move same relative to each other on the basis of the detection result of the sensor (4) in order to repeatedly machine at least one region of the coating-removal zone (Z).

Description

DEVICE AND METHOD FOR DECOATING PANELS MADE OF COATED SINGLE-PANEL OR MULTIPLE-PANEL GLASS, ESPECIALLY LAMINATED OR LAMINATED SAFETY GLASS

The invention relates to a device and a method for removing coatings from panels made of coated single or multiple panes of glass, in particular laminated or laminated safety glass.

Panes or plates made of multi-pane glass, in particular laminated glass or laminated safety glass (VSG), which is shown schematically in Figure 1b, usually consist of two glass panes, preferably made of float glass 12, 13, which are connected to one another flatly by an intermediate film 14, preferably made of plastic, in particular a film made of polyvinyl butyral (PVB).

To improve heat protection and/or sun protection, the glass pane of the laminated glass or laminated safety glass that lies inside when installed is often provided with a so-called low-e coating (low emissivity), which is applied as a pyrolytic coating (hard coating) during the manufacturing process as a very thin metal oxide layer to the float glass pane or is subsequently applied in several metal oxide layers after the manufacturing process using a cathode ray process (sputtering/soft coating). Such a panel made of coated multi-pane glass, in particular laminated or laminated safety glass, is shown schematically in Fig. 1b, where 5 designates the low-e coating and 10 the panel made of coated multi-pane glass.

Increasingly, cuts of coated multi-pane glass, in particular laminated glass or laminated safety glass, are also used to manufacture insulating glass panes, in which a cut of coated laminated glass or laminated safety glass (Fig. 1b) is bonded to another such cut (without coating) or to an uncoated single-pane glass. Glass panes (“single-pane glass”), for example made of float glass, can be connected to form a unit via a spacer running around the edge. Such an insulating glass pane is shown schematically in Figure 2a. The laminated glass or laminated safety glass cut 15 in Figure 2a is connected to a single glass pane 16 and the spacer 17 to form the insulating glass unit 19, forming a space 18 between the panes, which is preferably filled or evacuated with a protective gas. Figure 2b shows schematically an insulating glass pane made of two single glass panes, one of which is coated, which are connected to a spacer 17.

In order to reliably and durably bond the spacer 17 to the inner surface of the single-pane and multi-pane glass or laminated glass or laminated safety glass cut 15 coated in this way, the coating 5 in the edge region 11 of the two panes to be connected via the spacer 17 must be removed. This process is referred to as "edge stripping". The edge stripping of single-pane or multi-pane glass panels, in particular laminated glass or laminated safety glass panels, and the cutting into cut pieces is now carried out in successive processing steps using separate devices or a combined device.

A device for removing a functional coating from glass panes is disclosed, for example, in DE 196 32 240 A1. This decoating device has a so-called "twin grinding head" with a pair of grinding tools in the form of grinding wheels of different widths that can be driven to rotate. In order to produce the individual decoating strips, the grinding head is mounted on a travel bridge, can be pivoted about a vertical axis of rotation and can be lowered and raised onto the glass surface.

If the functional coating is not applied completely or without residue in the edge areas intended for the subsequent production of insulating glazing, this can lead to quality defects in the finished insulating glass element. This can happen because the edge bonding adhesives that bond the spacer units to the glass pane are designed exclusively for direct bonding to glass surfaces and not to the functional layers (see WO 2021/044015 Al). For example, improper use of an edge bonding adhesive can lead to premature escape of a protective gas filling or the loss of a vacuum, which in turn leads to considerable effort and costs if such products are already installed in a building. If such defects are discovered after the laminated glass or laminated safety glass has been completed but before installation, they can no longer be remedied and the product is scrap.

In order to detect such defects when removing an edge coating during production, DE 10 2016 104 273 A1 discloses a method and a device for treating flat glass units in a glass processing plant, wherein the flat glass units have at least one glass surface provided with a coating, and wherein the coating has at least one stripping contour along a boundary between the coated and stripped glass surface. In particular, in preparation for cutting processes in a cutting device, the at least one stripping contour is detected by means of a sensor system for a qualitative and/or quantitative test. The sensor system preferably has an optical sensor means, for which in particular a contrast, reflection and/or image sensor is used, wherein the sensor means is in particular designed as a camera. The detection result is used here, for example, to determine an optimal cutting line in the area of the decoating contour and to control a subsequent cutting process accordingly, to make quantitative statements about the quality of the decoating process for statistical evaluations, or to stop the system for maintenance purposes. US Pat. No. 7,369,240 B1 discloses devices and methods for testing defects during the stripping of edge strips from transparent glass panes in real time by means of optical inspection by a camera and image processing in order to display the detection result on a display.

In the state of the art according to DE 10 2016 104 273 Al and US 7 369 240 Bl, the presence of decoating defects or residues is determined via image capture, but this result is not used in the machining process itself.

From DE 10 2019 213 603 A1, a device and a method for edge stripping of a functional coating and, if applicable, an additional protective layer of glass panes, for example laminated glass panes, are known, wherein in a first processing station a mechanical edge stripping is carried out by grinding and immediately thereafter in a second processing station processing residues are evaporated or burned by means of laser ablation.

From DE 10 2018 107 697 A1, an edge stripping device and a method for removing coatings from glass panels, preferably laminated glass panels, are known which have a protective coating in the form of a removable protective film or a non-removable polymer protective layer on at least one of their two main surfaces. Before the film strip is mechanically removed, it is segmented into film strip sections using laser tracks or the polymer protective layer is removed using laser radiation.

In the state of the art according to DE 10 2019 213 603 Al and DE 10 2018 107 697 Al, there is no checking of the decoating quality, but rather a general processing of the decoating strips by means of a technically relatively complex laser irradiation. The object of the invention is to provide a device and a method for decoating panels made of coated single or multiple panes of glass, in particular laminated or laminated safety glass, in which the decoating quality is improved in order to reduce the risk of the defects described above when using the blanks produced with the device in insulating glass panes.

To solve this problem, the invention proposes a device for removing the coating from plates made of coated single or multiple panes of glass, in particular laminated or laminated safety glass, with the features of patent claim 1 or 10, as well as a method for removing the coating from plates made of coated single or multiple panes of glass, in particular laminated or laminated safety glass, with the features of patent claim 15 or 16. Preferred embodiments are specified in the dependent claims.

The invention therefore relates in particular to a device for decoating plates made of coated single or multi-pane glass, in particular laminated or laminated safety glass, comprising at least one decoating tool for removing a coating on at least one of the two opposite main surfaces of a plate made of coated single or multi-pane glass to form a decoating zone, wherein the at least one decoating tool and the main surface of the plate can be positioned relative to one another and can be moved relative to one another in a direction of advance of the grinding process, and wherein the at least one decoating tool preferably has a grinding wheel that can be driven to rotate, and a sensor for detecting the decoating zone, preferably after processing by the at least one decoating tool, wherein the device for decoating plates is configured to, on the basis of the detection result of the sensor, to position at least one decoating tool, preferably the grinding wheel which can be driven for rotation, and the main surface of the plate relative to one another and to move them relative to one another in order to repeatedly process at least one region of the decoating zone.

Preferably, the device for stripping plates is configured to determine the presence of coating residues in the stripping zone on the basis of the detection result of the sensor.

Preferably, the sensor comprises an image sensor, preferably a CCD or a laser scanner.

Preferably, the at least one decoating tool has the grinding disk which can be driven for rotation and has a width which corresponds to the width of the decoating zone to be formed.

Preferably, the device has a support table with a transport device for moving the plate made of coated single or multi-pane glass relative to the at least one decoating tool, preferably a grinding wheel that can be driven for rotation, in a plane of the main surface of the plate or in a plane parallel thereto and/or the at least one decoating tool, preferably the grinding wheel that can be driven for rotation, is movable in a plane of the main surface of the plate or in a plane parallel thereto.

Preferably, the support table and/or the at least one decoating tool, preferably the grinding wheel that can be driven for rotation, is adjustable/adjustable in a direction perpendicular to the plane of the main surface of the plate.

Preferably, the at least one decoating tool has a grinding wheel that can be driven for rotation, the device for decoating plates has a temperature sensor for detecting a temperature of the grinding wheel and/or a processing zone of the grinding wheel on the main surface of the plate in processing , and the device for decoating plates is configured to adjust a contact pressure of the grinding wheel on the main surface of the plate based on the detection result of the temperature sensor .

Preferably, the device for stripping panels is configured to reduce the contact pressure when the temperature detected by the temperature sensor is above a preset value and to increase the contact pressure when the temperature detected is below a preset value.

Preferably, the contact pressure is adjusted by adjusting/feeding the support table and/or the grinding wheel which can be driven for rotation, in the direction perpendicular to the plane of the main surface of the plate.

The invention then also relates to a device for stripping panels made of coated single or multi-pane glass, in particular laminated or laminated safety glass, comprising at least one stripping tool for removing a coating on at least one of the two opposite main surfaces of a panel made of coated single or multi-pane glass to form a stripping zone, wherein the at least one stripping tool has a grinding wheel that can be driven to rotate, and wherein the grinding wheel and the main surface of the panel can be positioned relative to one another and moved relative to one another in a direction of progress of the grinding process, and a temperature sensor for detecting a temperature of the grinding wheel, wherein the device for stripping panels is configured to set a contact pressure of the grinding wheel on the main surface of the panel on the basis of the detection result of the temperature sensor.

Preferably, the device for decoating plates is configured to reduce the contact pressure during a processing operation when the temperature detected by the temperature sensor exceeds a preset value and to a detected temperature is below a specified value to increase the contact pressure during the machining process.

Preferably, the device comprises a support table with a transport device for moving the plate of coated single or multi-pane glass relative to the grinding wheel in a plane of the main surface of the plate or in a plane parallel thereto and/or the grinding wheel is movable in a/the plane of the main surface of the plate or in a plane parallel thereto.

Preferably, the support table and/or the grinding wheel are adjustable/adjustable in a direction perpendicular to the plane of the main surface of the plate.

Preferably, the contact pressure is adjusted by adjusting/feeding the support table and/or the grinding wheel in the direction perpendicular to the plane of the main surface of the plate.

The invention then also relates to a method for stripping panels made of coated single or multi-pane glass, in particular laminated or laminated safety glass, comprising removing a coating on at least one of the two opposite main surfaces of a panel made of coated single or multi-pane glass to form a stripping zone by positioning a stripping tool, preferably a grinding wheel driven to rotate, and the main surface of the panel relative to one another and moving them relative to one another in a direction of progress of the grinding process, and detecting the stripping zone with a sensor, preferably immediately after processing by the stripping tool, in order to determine the presence of coating residues in the stripping zone, and positioning and moving the stripping tool, preferably the grinding wheel driven to rotate, and the panel relative to one another in order to repeatedly process at least one area of the stripping zone when the presence of coating residues in the stripping zone is determined. The invention then also relates to a method for decoating panels made of coated single or multi-pane glass, in particular laminated or laminated safety glass, comprising removing a coating on at least one of the two opposite main surfaces of a panel made of coated single or multi-pane glass by means of a grinding wheel driven to rotate in order to form a decoating zone, wherein the grinding wheel and the main surface of the panel are positioned relative to one another and moved relative to one another in a direction of progress of the grinding process, detecting a temperature of the grinding wheel, and adjusting a contact pressure of the grinding wheel on the main surface of the panel on the basis of the detected temperature, wherein if the detected temperature is above a predetermined value, the contact pressure is reduced during a processing operation and if the detected temperature is below a predetermined value, the contact pressure is increased during the processing operation.

The device and the method can therefore be used to produce panels made of coated single or multi-pane glass, in particular laminated or laminated safety glass, with high decoating quality for use in the manufacture of insulating glass panes in a particularly efficient manner and using well-known, reliable and relatively inexpensive mechanical decoating tools (grinding wheels). In particular, redundant processing of areas of the panels that are already defect-free after the first decoating run is avoided and the grinding quality is improved during the processing by dynamically adjusting important processing parameters, thus achieving a defect-free product with one loading process.

The invention is described below using exemplary embodiments with reference to the accompanying drawings. They show: Figure la is a schematic representation of a pane or sheet of coated toughened glass in cross-section;

Figure 1b is a schematic representation of a pane or plate made of coated multi-pane glass, in particular laminated or laminated safety glass (VSG) in cross section;

Figure 2a is a schematic representation of an insulating glass unit with a cut of a pane or plate made of coated multi-pane glass or laminated or laminated safety glass (VSG) and a single-pane glass in cross section;

Figure 2b is a schematic representation of an insulating glass unit with two cut pieces of a pane or sheet of coated single-pane glass in cross section;

Figure 3 is a schematic representation of a device for removing coatings from plates made of coated single or multiple panes of glass according to a first embodiment in a side view (in the figure, both types of glass panes are shown alternatively); and

Figure 4 is a schematic representation of a device for decoating plates made of coated single or multiple pane glass according to a second embodiment in a front view (in the figure, both types of glass pane are shown alternatively).

The device according to the invention according to the various embodiments shown in Figs. 3 and 4 for stripping plates made of coated single or multi-pane glass, in particular laminated or laminated safety glass (VSG) (the three terms are used synonymously in the context of the present description, whereby for the purpose of simplification, reference is made hereafter only to "laminated glass"), comprises a stripping tool 2 known per se in the prior art for partially removing a coating 5, for example a low-e coating, on at least one of the two opposite main surfaces of the coated plate 3. made of laminated glass for forming a decoating zone Z in a working area of the decoating tool 2 .

The decoating tool 2 preferably has a grinding disk or roller 2a which can be driven to rotate about an axis parallel to the plane of the surface of the plate to be processed, which preferably has a width which corresponds to the width of the decoating zone Z to be formed and which mechanically abrasively removes the coating. The material of the grinding disk or roller, its composition, grain size, hardness as well as the processing conditions and parameters such as speed, feed force and relative speed or feed are selected as in the prior art depending on the coating to be removed.

Also included within the scope of the invention are decoating tools which have a plurality of grinding wheels which interact and possibly partially overlap in the processing area and are therefore arranged offset next to and behind one another, or those which have one or more grinding wheels which are adjustable in terms of their processing width (see, for example, the device disclosed in DE 19632240 A1), as well as tools which may be based on a different mechanical operating principle in order to remove the coating.

The decoating tool 2, here the grinding disk or roller 2a, is further preferably pivotable about an axis vertical to the plane of the surface of the plate to be machined, preferably by 360°, so that grinding operations can also be carried out in another direction, for example in an opposite direction, without changing the direction of rotation of the grinding disk.

If the sensor 4 for detecting the decoating zone, which will be described later, is coupled to the grinding wheel on a functional carrier, it can be swiveled together with the grinding wheel around this vertical axis so that it is always in the correct positional relationship to the Detection of the processing zone behind the grinding wheel. The same applies to the temperature sensor 7, also described later, for detecting a temperature of the grinding wheel 2a and/or the processing zone of the grinding wheel 2a on the surface of the plate.

In the device according to the invention according to the first and second embodiments shown in Fig. 3 and 4, the at least one decoating tool 2 and the main surface of the plate 3 can be positioned relative to one another and can be moved relative to one another in a direction of progress S of the grinding process. This can be realized in a manner known per se, for example in that the device has a support table with a transport device for moving the plate 3 made of coated single or multi-pane glass relative to the at least one decoating tool 2 in a plane of the main surface of the plate 3 or in a plane parallel thereto (for example in the form of a roller conveyor or a conveyor belt) and/or that the at least one decoating tool 2 is movable in a/the plane of the main surface of the plate 3 or in a plane parallel thereto (for example in the form of a portal or a bridge above the support table).

The support table and/or the at least one decoating tool 2 (here the grinding wheel 2a) is/are adjustable/adjustable in the direction perpendicular to the plane of the main surface of the plate 3 in order to lift the tool from the surface of the plate for positioning at a desired processing position on the plate and to adjust it to suit different plate thicknesses and to bring the grinding wheel into engagement with the surface to be processed with a desired contact force.

The device according to the invention according to the first and second embodiments shown in Figs. 3 and 4 further comprises a sensor 4 for detecting the Decoating zone Z, preferably immediately after the processing or behind the decoating tool 2 in the processing direction S.

The sensor 4 (this term is to be understood here generally as any device which enables the optical detection of residues of a coating present in the processing zone and delivers a detection signal which can be evaluated by a computer device 8) can have an optical image sensor, preferably a CCD or a laser scanner, in a manner known per se (see, for example, the devices described in DE 10 2016 104 273 A1 and US 7 369 240 B1).

To evaluate the detection signal generated by the optical sensor 4, a PC or a dedicated computer 8 is provided here, for example, so that the device 1 is configured to first determine the presence of coating residues in the decoating zone Z on the basis of the detection result of the sensor 4 in a manner known per se (see, for example, the above-mentioned prior art publications) and then, on this basis, to position the at least one decoating tool 2 (here the grinding wheel 2a) and the main surface of the plate 3 relative to one another and to move them relative to one another for processing (by controlling the support table and/or the portal or the bridge above the support table which carries the decoating tool 2) in order to repeatedly process at least one area of the decoating zone Z.

The repeated processing of the decoating zone Z can be carried out in such a way that the entire plate is first processed in a first processing process for decoating and the errors detected by the sensor 4 and determined by the evaluation in the computer 8 are continuously stored as coordinates of the machine coordinate system. In a second step, the decoating tool 2 can then be positioned as described at the detected error positions in order to to carry out the decoating process again. The processing can be limited to the identified defect areas plus a certain entry and exit zone. Alternatively, the entire processing length of a linear section or a grinding path segment can be processed again.

Alternatively, the decoating tool 2 can also be raised before the processing of the plate has been completed, for example immediately after a defect is detected or at the end of a linear section or grinding path segment, reset to the defect position or the beginning of the linear section or grinding path segment for further processing and then placed back on the surface of the plate. The rotation of the grinding wheel can be interrupted or maintained during this reset process.

In Fig. 4, a device for removing coatings from plates made of coated single or multiple panes of glass is shown in a front view according to a second exemplary embodiment. The side view corresponds to the illustration in Fig. 3. In this exemplary embodiment, a temperature sensor 7 is additionally provided for detecting a temperature of the grinding wheel 2a in the vicinity of the processing zone. The temperature sensor can be designed as an infrared sensor in order to detect the temperature without contact.

The temperature of the processing zone has a decisive influence on the quality and efficiency of the decoating and the behavior of the glass material, whose properties (ductility, brittleness) are strongly dependent on temperature. The grinding process for processing glass is typically a dry grinding process. The grinding wheels used often have a synthetic resin bond of the abrasive material, which begins to soften or can dissolve at a certain temperature. This may reduce the grinding effect, which increases the risk of incomplete removal of the coating. The temperature of the Grinding wheel friction can be increased by increasing the contact pressure of the grinding wheel against the surface as friction increases or conversely can be decreased by reducing the contact pressure.

Accordingly, the temperature sensor 7 is connected to the PC or the dedicated computer 8 in order to supply the detection signal thereto. On the basis of the detection result of the temperature sensor 7, the contact pressure of the grinding wheel 2a on the main surface of the plate 3 is then controlled by means of a stored function, wherein when the temperature detected by the temperature sensor 7 is above a preset value or preset value range, a corresponding actuator of the grinding wheel positioning is controlled in order to reduce the contact pressure, and when the temperature detected is below a preset value or preset value range, it is controlled in order to increase the contact pressure.

Since the rotation speed of the grinding wheel and the feed rate also influence the temperature in the machining zone, these parameters of the machining process can also be controlled within the framework of the stored function on the basis of the detection result of the temperature sensor 7. The parameters can be set in real time or with a predetermined delay. Compliance with a desired temperature can be ensured by feedback or control.

The course of the recorded temperature over time with known other processing parameters can also be evaluated to monitor the wear and tear of the grinding wheel.

Additionally or alternatively, the temperature sensor 7 (or another temperature sensor) can detect the machining zone of the grinding wheel 2a on the main surface of the plate 3 and supply the detection signal to the PC or the dedicated computer 8. The detection of the temperature of the grinding wheel can be provided as an independent functionality in the device because it represents a measure for improving the decoating quality, or it can be used together with the optical detection of coating residues and repeated processing of defects described with reference to the first embodiment.

Fig. 3 shows a schematic representation of a suction device 9 for sucking away the grinding dust that is produced. The temperature sensor 7 for detecting the processing zone of the grinding wheel could, for example, be provided on the suction device 9.

In a further embodiment of a decoating device (not shown), the decoating tool can be arranged on a portal above a support table for the plate to be processed and can be moved over the entire surface. In this case, several decoating zones can be formed on the plate in the form of line segments, which can be processed, for example, by pivoting the grinding wheel around the vertical axis on the portal.

This device can be equipped with a cutting tool, also known in the prior art, for cutting the main surface of the laminated glass panel in the region of the decoating zones. The cutting tool can also be carried on a separate portal above the support table and can have a tool for applying scoring lines which define cutting lines on the main surface of the laminated glass panel, for example in the form of a cutting wheel which can be rotated - actively or passively - about a horizontal axis which is parallel to the plane of the surface of the panel to be machined.

The glass plates of the panes or plates made of laminated glass are separated at the scoring lines in a conventional manner in a work step following the scoring, in which the glass plates are separated at the scoring lines by arching, kinked, pulled or bent or broken and separated by the application of heat or cold or pressure or any combination thereof.

The rotation axis(es) of the grinding wheel(s) and the rotation axes of the cutting wheel(s) may be parallel to each other or inclined to each other in parallel planes.

The cutting tool (for example the cutting wheel) can be arranged in such a way that it can apply the scoring lines acting as cutting lines in a plan view of the main surfaces of the panel symmetrically to the decoating zone formed by the decoating tool on the main surface of the laminated glass panel. The cutting or scoring lines are therefore located exactly in the middle between the outer edges of the band-like decoating zone.

The decoating tool and the cutting tool can - regardless of their respective specific design - be designed on the device in such a way that they can be arranged one behind the other in a fixed positional relationship relative to one another and in a direction of progression of the grinding or cutting process so that the cutting line of the cutting tool lies symmetrically in the working area of the decoating tool (or symmetrically in the decoating zone formed by it), while the tools are moved on a guide in the direction of progression S of the grinding or cutting process along the plate to be processed and usually fixed with corresponding devices such as suction cups etc. For this purpose, the tools are or can be connected to one another in a mechanically rigid manner, for example via a portal or other suitable structural elements such as holders of the device, so that the required symmetry is always guaranteed at every point along the direction of progression S of the grinding or cutting process (first grinding and then cutting or scoring). This does not, of course, exclude the possibility that the relative position of the Tools can be set to one another in various fixed positional relationships, for example to change the machining conditions, before machining. The invention also encompasses the fact that the grinding tool and/or the cutting tool itself can be elastically mounted, or that the tools can be moved individually or jointly between working and rest positions within the device.

Alternatively, it is also conceivable and encompassed by the invention that the plate is moved relative to the tools arranged at a fixed position in order to carry out the cutting process.

In order to transport the plate to be processed into the device to the tools and to move it between different cuts relative to the tools of the device, the device can have a support table with a transport device, for example a roller or drum or belt conveyor and/or a rotating device, for example a turntable, for actively moving the plate and if necessary for fixing it in a processing position. Alternatively, the device can have a further support table or a further rotating device, for example a turntable, for the laminated glass plate, to or from which the plate is transported before or after the processing process in order to rotate the plate outside the processing area. A combination of both principles is also conceivable in order to further shorten the cycle time of the grinding or cutting process.

In the context of the disclosure, the decoating zone formed with the decoating tool is described as a decoating strip with a predetermined or adjustable width. The decoating zone to be produced with the decoating tool can, however, be designed in any suitable decoating contour. The invention therefore also includes devices which have a curved or polygonal decoating zone and, if necessary, corresponding separating cuts can be made in the laminated glass panel.

In a further variant of the device (not shown), at least one additional or further decoating tool can be provided, for example in the form of a grinding device, which decoats another edge strip of the plate 3, for example on the outer circumference. For the additional decoating tool, a grinding disk that is half as wide as the other decoating tool can be used, since only the width for a single spacer on the edge needs to be removed. This additional or further decoating tool can be assigned its own sensor 4 and, if necessary, its own temperature sensor 7 with the functionality described above.

By repeatedly moving the plate and, if necessary, rotating the plate or the cut pieces, finished sections of the desired dimensions can be produced for use in the manufacture of insulating glass panes, which have a continuous decoating zone of constant width around the respective outer circumference in which the spacers are to be arranged.

Claims

Patent claims

1. A device (1) for decoating plates (3) made of coated single or multi-pane glass, in particular laminated or laminated safety glass, comprising at least one decoating tool (2) for removing a coating (5) on at least one of the two opposite main surfaces of a plate (3) made of coated single or multi-pane glass to form a decoating zone (Z), wherein the at least one decoating tool (2) and the main surface of the plate (3) can be positioned relative to one another and moved relative to one another in a direction of advance (S) of the grinding process, and wherein the at least one decoating tool

(2) preferably has a grinding wheel (2a) which can be driven for rotation, and a sensor (4) for detecting the decoating zone (Z), preferably after processing by the at least one decoating tool (2), wherein the device (1) for decoating plates

(3) is configured to position the at least one decoating tool (2), preferably the grinding wheel (2a) that can be driven for rotation, and the main surface of the plate (3) relative to one another and to move them relative to one another on the basis of the detection result of the sensor (4) in order to repeatedly process at least one region of the decoating zone (Z).

2. The device (1) according to claim 1, wherein the device (1) for decoating plates (3) is configured to determine the presence of coating residues in the decoating zone (Z) on the basis of the detection result of the sensor (4).

3. The device (1) according to one of claims 1 to 2, wherein the sensor (4) comprises an image sensor, preferably a CCD or a laser scanner.

4. The device (1) according to one of claims 1 to 3, wherein the at least one decoating tool (2) has the grinding wheel (2a) drivable for rotation with a width corresponding to the width of the decoating zone (Z) to be formed.

5. The device (1) according to one of claims 1 to 4, wherein the device (1) has a support table with a transport device for moving the plate (3) made of coated single or multi-pane glass relative to the at least one decoating tool (2), preferably a grinding wheel (2a) that can be driven for rotation, in a plane of the main surface of the plate (3) or in a plane parallel thereto and/or wherein the at least one decoating tool (2), preferably the grinding wheel (2a) that can be driven for rotation, is movable in a plane of the main surface of the plate (3) or in a plane parallel thereto.

6. The device (1) according to claim 5, wherein the support table and/or the at least one decoating tool (2), preferably the grinding wheel (2a) that can be driven for rotation, is adjustable/adjustable in a direction perpendicular to the plane of the main surface of the plate (3).

7. The device (1) according to one of claims 1 to 6, wherein the at least one decoating tool (2) has a grinding wheel (2a) that can be driven for rotation, wherein the device (1) for decoating plates (3) has a temperature sensor (7) for detecting a temperature of the grinding wheel (2a) and/or a processing zone of the grinding wheel (2a) on the main surface of the plate (3) being processed, and wherein the device (1) for decoating plates (3) is configured to adjust a contact pressure of the grinding wheel (2a) on the main surface of the plate (3) based on the detection result of the temperature sensor (7).

8. The device (1) according to claim 7, wherein the device (1) for stripping plates (3) is configured to reduce the contact pressure when the temperature detected by the temperature sensor (7) is above a preset value and to increase the contact pressure when the temperature detected is below a preset value.

9. The device (1) according to claim 7 or 8, each in conjunction with claim 6, wherein the adjustment of the contact pressure is carried out by the adjustment/feed of the support table and/or the grinding wheel (2a) which can be driven for rotation, in the direction perpendicular to the plane of the main surface of the plate (3).

10. A device (1) for stripping plates (3) made of coated single or multiple panes of glass, in particular laminated or laminated safety glass, comprising at least one stripping tool (2) for removing a coating (5) on at least one of the two opposite main surfaces of a plate (3) made of coated single or multiple panes of glass to form a stripping zone (Z), wherein the at least one stripping tool (2) has a grinding wheel (2a) that can be driven to rotate, and wherein the grinding wheel (2a) and the main surface of the plate (3) can be positioned relative to one another and moved relative to one another in a direction of progress (S) of the grinding process, and a temperature sensor (7) for detecting a temperature of the grinding wheel (2a), wherein the device (1) for decoating plates (3) is configured to adjust a contact pressure of the grinding wheel (2a) on the main surface of the plate (3) based on the detection result of the temperature sensor (7).

11. The device (1) according to claim 10, wherein the device (1) for decoating plates (3) is configured to reduce the contact pressure during a machining operation when the temperature detected by the temperature sensor (7) is above a preset value and to increase the contact pressure during the machining operation when the temperature detected is below a preset value.

12. The device (1) according to one of claims 10 to 11, wherein the device (1) has a support table with a transport device for moving the plate (3) of coated single or multi-pane glass relative to the grinding wheel (2a) in a plane of the main surface of the plate (3) or in a plane parallel thereto and/or wherein the grinding wheel (2a) is movable in a/the plane of the main surface of the plate (3) or in a plane parallel thereto.

13. The device (1) according to claim 12, wherein the support table and/or the grinding wheel (2a) is adjustable/adjustable in a direction perpendicular to the plane of the main surface of the plate (3).

14. The device (1) according to claim 13, wherein the adjustment of the contact pressure is carried out by the adjustment/feed of the support table and/or the grinding wheel (2a) in the direction perpendicular to the plane of the main surface of the plate (3).

15. A method for removing coatings from plates (3) made of coated single or multiple panes of glass, in particular laminated or laminated safety glass, comprising

Removing a coating (5) on at least one of the two opposite main surfaces of a plate (3) made of coated single or multi-pane glass to form a decoating zone (Z) by positioning a decoating tool (2), preferably a grinding wheel (2a) driven to rotate, and the main surface of the plate (3) relative to one another and moving them relative to one another in a direction of progress (S) of the grinding process, and

Detecting the decoating zone (Z) with a sensor (4), preferably immediately after processing by the decoating tool (2), in order to determine the presence of coating residues in the decoating zone (Z), and

Positioning and moving the decoating tool (2), preferably the grinding wheel (2a) that can be driven for rotation, and the plate (3) relative to one another in order to repeatedly process at least one region of the decoating zone (Z) when the presence of coating residues in the decoating zone (Z) is detected.

16. A method for removing coatings from plates (3) made of coated single or multiple panes of glass, in particular laminated or laminated safety glass, comprising

Removing a coating (5) on at least one of the two opposite main surfaces of a plate (3) made of coated single or multi-pane glass by means of a grinding wheel (2a) driven for rotation to form a decoating zone (Z), wherein the grinding wheel (2a) and the main surface of the plate (3) are positioned relative to one another and moved relative to one another in a direction of progress (S) of the grinding process,

Detecting a temperature of the grinding wheel (2a), and Adjusting a contact pressure of the grinding wheel (2a) on the main surface of the plate (3) on the basis of the detected temperature, wherein at a detected temperature above a preset value the contact pressure is reduced during a machining operation and at a detected temperature below a preset value the contact pressure is increased during the machining operation.