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

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

[0001] DEVICE AND METHOD FOR DECOATING PANELS MADE OF COATED SINGLE-PANEL OR MULTI-PANEL GLASS, IN PARTICULAR LAMINATED OR LAMINATED SAFETY GLASS

[0002] The invention relates to a device and a method for decoating plates made of coated single or multi-pane glass, in particular laminated or laminated safety glass.

[0003] 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 joined to one another by an intermediate film 14, preferably made of plastic, in particular a film made of polyvinyl butyral (PVB).

[0004] To improve heat insulation and / or solar protection, the inner glass pane of the laminated glass or laminated safety glass when installed is often provided with a so-called low-e coating (low emissivity). This is applied to the float glass pane as a pyrolytic coating (hard coating) during the manufacturing process as a very thin metal oxide layer or is subsequently applied after the manufacturing process in several metal oxide layers using a cathode ray method (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.

[0005] Increasingly, blanks of coated multi-pane glass, in particular laminated glass or laminated safety glass, are also being used to produce insulating glass panes, in which a blank of coated laminated glass or laminated safety glass (Fig. 1b) is joined to another such blank (without coating) or to an uncoated single-pane glass pane ("toughened glass"), for example made of float glass, via a spacer running around the edge to form a unit. Such an insulating glass pane is shown schematically in Figure 2a. In Fig. 2a, the laminated glass or laminated safety glass blank 15 is joined to a single-pane glass pane 16 and the spacer 17 to form an insulating glass unit 19, preferably with a protective gas filled or evacuated space 18 between the panes. Fig.Figure 2b schematically shows an insulating glass pane made up of two single glass panes, one of which is coated, which are connected by a spacer 17.

[0006] In order to reliably and durably adhere the spacer 17 to the inner surface of the coated single-pane or multi-pane glass, laminated glass, or laminated safety glass blank 15, the coating 5 must be removed from the edge region 11 of the two panes to be joined via the spacer 17. This process is referred to as "edge stripping." The edge stripping of single-pane or multi-pane glass panels, particularly laminated glass or laminated safety glass panels, and the cutting into blanks is now carried out in sequential processing steps using separate devices or a combined device.

[0007] 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 for rotation. To produce the individual decoating strips, the grinding head is mounted on a traveling bridge, can be pivoted about a vertical axis of rotation, and can be lowered onto and raised from the glass surface.

[0008] 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, since the edge sealing 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 A1). For example, improper use of an edge sealing 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 expense 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 rejected.

[0009] 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 decoating contour along a boundary between the coated and decoated glass surface. In particular, in preparation for cutting processes in a cutting device, the at least one decoating contour is detected by means of a sensor for a qualitative and / or quantitative test. The sensor 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. US Pat. No. 7,369,240 B1 discloses devices and methods for testing defects during the decoating of edge strips from transparent glass panes in real time using optical inspection with a camera and image processing in order to display the detection result on a screen.

[0010] In the state of the art according to DE 10 2016 104 273 A1 and US 7 369 240 B1, the presence of decoating defects or residues is detected by image capture, but this result is not used in the machining process itself.

[0011] From DE 10 2019 213 603 A1 a device and a method for edge deletion of a functional coating and optionally an additional protective layer of glass panes, for example laminated glass panes, are known, wherein in a first processing station a mechanical edge deletion is carried out by grinding and immediately thereafter in a second processing station processing residues are evaporated or burned by means of laser ablation.

[0012] DE 10 2018 107 697 A1 discloses a device and method for edge stripping glass panels, preferably laminated glass panels, 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.

[0013] In the prior art according to DE 10 2019 213 603 A1 and DE 10 2018 107 697 A1, there is no checking of the decoating quality, but rather a general processing of the decoating strips using a technically relatively complex laser irradiation. The object of the invention is to provide a device and a method for decoating sheets made of coated single- or multi-pane 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.

[0014] To solve this problem, the invention proposes a device for stripping coated single- or multi-pane glass, in particular laminated or laminated safety glass, having the features of patent claim 1 or 10, as well as a method for stripping coated single- or multi-pane glass, in particular laminated or laminated safety glass, having the features of patent claim 15 or 16. Preferred embodiments are specified in the dependent claims.

[0015] 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 moved relative to one another in a direction of progress of the grinding process, and wherein the at least one decoating tool preferably has a grinding wheel that can be driven for rotation, and a sensor for detecting the decoating zone, preferably after processing by the at least one decoating tool, wherein the device is configured for decoating plates,to position the at least one decoating tool, preferably the grinding wheel that can be driven to rotate, and the main surface of the plate relative to each other and to move them relative to each other on the basis of the detection result of the sensor in order to repeatedly process at least one area of ​​the decoating zone.

[0016] Preferably, the device for stripping plates is configured to detect the presence of coating residues in the stripping zone on the basis of the detection result of the sensor.

[0017] Preferably, the sensor comprises an image sensor, preferably a CCD or a laser scanner.

[0018] Preferably, the at least one decoating tool has the grinding wheel which can be driven to rotate and has a width which corresponds to the width of the decoating zone to be formed.

[0019] Preferably, the device has a support table with a transport device for moving the plate of coated single- or multi-pane glass relative to the at least one decoating tool, preferably a grinding wheel that can be driven to rotate, 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 to rotate, is movable in a plane of the main surface of the plate or in a plane parallel thereto.

[0020] Preferably, the support table and / or the at least one decoating tool, preferably the grinding wheel which can be driven to rotate, is adjustable / adjustable in a direction perpendicular to the plane of the main surface of the plate.

[0021] Preferably, the at least one decoating tool has / the grinding wheel that can be driven to rotate, 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 being processed, and the device for decoating plates is configured to adjust a contact pressure of the grinding wheel on the main surface of the plate on the basis of the detection result of the temperature sensor.

[0022] Preferably, the device for decoating plates 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.

[0023] Preferably, the contact pressure is adjusted by adjusting / feeding the support table and / or the grinding wheel which can be driven to rotate, in the direction perpendicular to the plane of the main surface of the plate.

[0024] The invention then also relates 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 has a grinding wheel that can be driven to rotate, and wherein the grinding wheel and the main surface of the plate 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 is configured for decoating plates,to set a contact pressure of the grinding wheel on the main surface of the plate based on the detection result of the temperature sensor.,

[0025] Preferably, the device for decoating plates is configured to reduce the contact pressure during a machining operation when the temperature detected by the temperature sensor is above a preset value and to increase the contact pressure during the machining operation when the temperature detected is below a preset value.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] The invention then also relates to a method for decoating plates 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 plate made of coated single- or multi-pane glass to form a decoating zone by positioning a decoating tool, preferably a grinding wheel driven for rotation, and the main surface of the plate relative to each other and moving them relative to each other in a direction of progress of the grinding process, and detecting the decoating zone with a sensor, preferably immediately after processing by the decoating tool, in order to determine the presence of coating residues in the decoating zone, and positioning and moving the decoating tool, preferably the grinding wheel driven for rotation,and the plate relative to each other in order to repeatedly process at least one area of ​​the decoating zone when the presence of coating residues is detected in the decoating zone. The invention then also relates to a method for decoating plates 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 plate made of coated single- or multi-pane glass by means of a grinding wheel driven for rotation to form a decoating zone, wherein the grinding wheel and the main surface of the plate are positioned relative to each other and moved relative to each other 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 plate based on the detected temperature,Wherein, if the detected temperature is above a specified value, the contact pressure is reduced during a machining operation and, if the detected temperature is below a specified value, the contact pressure is increased during the machining operation.

[0030] The device and method therefore make it possible to produce sheets 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 cost-effective mechanical decoating tools (grinding wheels). In particular, redundant processing of areas of the sheets that are already defect-free after the first decoating pass is avoided, and the grinding quality is improved during the processing by dynamically adjusting important processing parameters, thus achieving a defect-free product with a single loading process.

[0031] The invention is described below using exemplary embodiments with reference to the accompanying drawings. Figure 1a shows a schematic cross-sectional view of a pane or plate made of coated single-pane glass;

[0032] 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;

[0033] Figure 2a is a schematic representation of an insulating glass unit with a cut-out 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;

[0034] Figure 2b is a schematic representation of an insulating glass unit with two cut pieces of a pane or plate made of coated single-pane glass in cross section;

[0035] Figure 3 is a schematic representation of a device for decoating plates made of coated single- or multi-pane glass according to a first embodiment in a side view (in the figure, both types of glass panes are shown alternatively); and

[0036] Figure 4 is a schematic representation of a device for decoating plates made of coated single or multi-pane glass according to a second embodiment in a front view (in the figure, both types of glass pane are shown alternatively).

[0037] The device according to the invention according to the various embodiments shown in Figs. 3 and 4 for decoating sheets made of coated single-pane or multi-pane glass, in particular laminated or laminated safety glass (VSG) (the three terms are used synonymously in the present description, whereby for the purpose of simplification, reference is made hereinafter only to "laminated glass"), comprises a decoating 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 sheet 3 made of laminated glass to form a decoating zone Z in a working area of ​​the decoating tool 2.

[0038] The decoating tool 2 preferably has a grinding wheel or roller 2a which can be driven to rotate about an axis parallel to the plane of the surface of the plate to be machined, 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 wheel 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.

[0039] The invention also includes decoating tools which have a plurality of cooperating grinding wheels which may be partially overlapping in the processing area and are therefore 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 for removing the coating.

[0040] The decoating tool 2, here the grinding wheel 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 wheel.

[0041] If the sensor 4 (to be described later) for detecting the decoating zone is coupled to the grinding wheel on a functional carrier, it can be pivoted together with the grinding wheel about this vertical axis so that it is always in the correct position for detecting 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.

[0042] In the device according to the invention according to the first and second embodiments shown in Figs. 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 in 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).

[0043] 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.

[0044] The device according to the invention according to the first and second embodiments, which are 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.

[0045] 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 supplies a detection signal which can be evaluated by a computer device 8) can, 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), comprise an optical image sensor, preferably a CCD or a laser scanner.

[0046] To evaluate the detection signal generated by the optical sensor 4, a PC or a dedicated computer 8, for example, is provided here, 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.

[0047] The repeated processing of the decoating zone Z can be carried out in such a way that the entire plate is first processed for decoating in a first processing step and the errors detected by the sensor 4 and evaluated in the computer 8 are continuously saved as coordinates of the machine coordinate system. In a second step, the decoating tool 2 can then be positioned at the detected error positions as described in order to carry out the decoating processing there again. The processing can be limited to the detected error areas plus a certain entry and exit zone. Alternatively, an entire processing length of a linear section or a grinding path segment can be processed again.

[0048] Alternatively, the decoating tool 2 can also be lifted before completion of the processing of the plate, for example immediately after detecting a defect 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 repositioned on the surface of the plate. The rotation of the grinding wheel can be interrupted or maintained during this reset process.

[0049] Fig. 4 shows a front view of a device for decoating coated single- or multi-pane glass panels 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 the 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.

[0050] 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 temperature-dependent. The grinding process for processing glass is typically dry. The grinding wheels used often have a synthetic resin bond to the abrasive material, which begins to soften or can dissolve above a certain temperature. This may reduce the grinding effect and increase the risk of incomplete removal of the coating. The temperature of the grinding wheel can be increased by increasing the contact pressure of the grinding wheel against the surface, as this increases friction, or conversely it can be reduced by reducing the contact pressure.

[0051] Accordingly, the temperature sensor 7 is connected to the PC or the dedicated computer 8 in order to supply the detection signal thereto. Based on 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. When the temperature detected by the temperature sensor 7 is above a specified value or specified value range, a corresponding actuator for the grinding wheel positioning is controlled to reduce the contact pressure, and when the temperature detected is below a specified value or specified value range, it is controlled to increase the contact pressure.

[0052] Since the rotation speed of the grinding wheel and the feed rate also influence the temperature in the machining zone, these machining parameters can also be controlled within the stored function based on the detection result of temperature sensor 7. The parameters can be set in real time or with a predefined delay. Maintenance of a desired temperature can be ensured by feedback or closed-loop control.

[0053] 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.

[0054] Additionally or alternatively, the temperature sensor 7 (or another temperature sensor) can detect the processing zone of the grinding wheel 2a on the main surface of the plate 3 and feed the detection signal to the PC or the dedicated computer 8. The detection of the temperature of the grinding wheel can be provided as a standalone function 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.

[0055] Fig. 3 schematically shows a suction device 9 for extracting the resulting grinding dust. The temperature sensor 7 for detecting the machining zone of the grinding wheel could, for example, be provided on the suction device 9.

[0056] In a further embodiment of a decoating device (not shown), the decoating tool can be arranged on a gantry above a support table for the plate to be processed and can be moved over the entire surface. 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 gantry.

[0057] This device can be equipped with a cutting tool, also known in the prior art, for cutting the main surface of the laminated glass sheet in the region of the decoating zones. The cutting tool can also be carried on a dedicated portal above the support table and can comprise a tool for applying scoring lines, which define cutting lines, on the main surface of the laminated glass sheet, for example in the form of a cutting wheel that can be rotated - actively or passively - about a horizontal axis that is parallel to the plane of the surface of the sheet to be machined.

[0058] The glass plates of the panes or sheets of laminated glass are separated along the scoring lines in a manner known per se in a subsequent step, in which the glass plates are broken and separated along the scoring lines by arching, buckling, pulling or bending or by the action of heat or cold or pressure or combinations thereof.

[0059] The rotational axis(es) of the grinding wheel(s) and the rotational axes of the cutting wheel(s) can be parallel to each other or inclined to each other in parallel planes.

[0060] The cutting tool (e.g., the cutting wheel) can be arranged such that it can apply the scoring lines, which act as cutting lines, symmetrically to the decoating zone formed by the decoating tool on the main surface of the laminated glass sheet in a plan view of the main surfaces of the sheet. The cutting or scoring lines are therefore located exactly centrally between the outer edges of the band-like decoating zone.

[0061] The decoating tool and the cutting tool can - regardless of their respective concrete 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 progress of the grinding or cutting process in such a way 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 progress 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 progress S of the grinding or cutting process (first grinding and then cutting or scoring). This does not, of course, preclude the relative position of the tools to one another from being permanently set in various fixed positional relationships before machining, for example in order to change the machining conditions. The invention also encompasses the possibility 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.

[0062] Alternatively, it is also conceivable and encompassed by the invention that the plate is moved relative to the tools arranged in a fixed position in order to carry out the cutting process.

[0063] 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 cylinder or belt conveyor and / or a rotating device, for example a rotary table, 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 rotary table, for the laminated glass plate, to or from which the plate is transported before or after the processing operation 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 operation.

[0064] Within the scope of the disclosure, the decoating zone formed with the decoating tool is described as a decoating strip with a predetermined or adjustable width. However, the decoating zone to be produced with the decoating tool can be configured with any suitable decoating contour. The invention therefore also encompasses devices that can create a curved or polygonal decoating zone and, if appropriate, corresponding separating cuts in the laminated glass panel.

[0065] In a further variant of the device (not shown), at least one additional or further decoating tool, for example in the form of a grinding device, can be provided, which decoates a further edge strip of the plate 3, for example on the outer circumference. For the additional decoating tool, a grinding wheel half as wide as for 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 appropriate, its own temperature sensor 7 with the functionality described above.

[0066] By repeatedly moving the plate and, if necessary, rotating the plate or the blanks, finished sections of the desired dimensions can be produced for use in the manufacture of insulating glass panes. These sections 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) are positionable relative to one another and movable relative to one another in a direction of progress (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 to rotate, 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 area 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) which can be driven for rotation and has a width which corresponds 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 to rotate, 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 to rotate, 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) which can be driven to rotate, 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) comprises a grinding wheel (2a) which can be driven for rotation, wherein the device (1) for decoating plates (3) comprises 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) on the basis of the detection result of the temperature sensor (7).

8. The device (1) according to claim 7, wherein the device (1) for decoating 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 to rotate, in the direction perpendicular to the plane of the main surface of the plate (3).

10. 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) 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) are positionable relative to one another and movable 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) on the basis of 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 decoating plates (3) made of coated single- or multi-pane 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 for rotation, and the main surface of the plate (3) relative to each other and moving them relative to each other 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 to rotate, and the plate (3) relative to one another in order to repeatedly process at least one area of ​​the decoating zone (Z) when the presence of coating residues in the decoating zone (Z) is detected.

16. A method for decoating plates (3) made of coated single- or multi-pane 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 predetermined value the contact pressure is reduced during a machining operation and at a detected temperature below a predetermined value the contact pressure is increased during the machining operation.

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