Apparatus for producing glass, glass ceramic and / or glass ceramic material

Abstract

The invention relates to an apparatus for producing glass, glass ceramic and / or glass ceramic material, comprising a feed device for supplying a strip having a viscosity of between 0.01 Pa·s and 100 Pa·s to a shaping device, wherein the shaping device comprises at least one mobile, in particular rotatable discharge surface, and wherein a velocity, in particular tangential velocity, of the mobile, in particular rotatable discharge surface is 90% or more, preferably 95% or more, in particular 98% or more, preferably 99% or more and 200% or less, preferably 175% or less, in particular 150% or less, preferably 125% or less, in particular 120% or less, preferably 110% or less, in particular 105% or less, preferably 101% or less than a velocity of the supplied strip in the region where the strip meets the mobile, in particular rotatable, discharge surface. This enables provision of a stable strip of low-viscosity glass. The described minimum throughput is applicable to this end.

Description

[0001] 30.07.2024 Device for producing glass, glass ceramic and / or glass ceramic material The invention relates to a device for producing glass, glass ceramic and / or glass ceramic material, comprising a feed device for feeding a lamella of a glass melt to a shaping device, wherein the shaping device comprises at least one movable, in particular rotatable, discharge surface. A drawing device can be arranged downstream of the shaping device. The invention further relates to a method for producing glass, glass ceramic and / or glass ceramic material. The invention further relates to a glass product produced from a substrate comprising glass, glass ceramic and / or glass ceramic material. The glass is in particular produced from the glass melt. The term glass generally encompasses glass,Glass ceramic and / or glass ceramic material. WO 2021 / 221910 A1 discloses an apparatus and a method for producing low-viscosity glass plates with a liquidus viscosity of less than 5 kP. The method comprises forming a glass ribbon from glass with a liquidus viscosity < 5 kP and flowing the glass ribbon onto a surface of a molten metal bath in a tank. The tank has a length of less than 500 cm. The glass ribbon flows over the length of the tank in a downward direction from the first end to the second end of the tank such that the glass ribbon reaches its equilibrium thickness at the second end and the viscosity of the glass ribbon at the second end is at least 100 kP. The molten glass ribbon is then fed to a cooling roller. The cooling roller removes heat from the glass ribbon, causing it to be cooled. The disadvantage is that at low liquidus viscosity the glass ribbon tends to break up into individual strands,which results in high costs and time-consuming glass production. 30.07.2024 An object of the present invention is therefore to provide an apparatus for producing glass, glass ceramic and / or glass ceramic material, a method for producing glass, glass ceramic and / or glass ceramic material and a glass product, which are or can be produced simply and cost-effectively, particularly at high throughput, enabling a stable lamella, especially for glasses that have a low liquidus viscosity. A further object of the present invention is therefore to provide an alternative apparatus for producing glass, glass ceramic and / or glass ceramic material, an alternative method for producing glass,Glass ceramic and / or glass ceramic material and an alternative glass product. In one embodiment, the present invention achieves the above-mentioned objects with a device for producing glass, glass ceramic and / or glass ceramic material, comprising a feed device for feeding a lamella with a viscosity between 0.01 Pa s and 100 Pa s to a shaping device, wherein the shaping device comprises at least one movable, in particular rotatable run-off surface, and wherein a speed, in particular tangential speed, of the movable, in particular rotatable run-off surface is 90% or more, preferably 95% or more, in particular 98% or more, preferably 99% or more and 200% or less, preferably 175% or less, in particular 150% or less, preferably 125% or less, in particular 120% or less, preferably 110% or less, in particular 105% or less,preferably 101% or less of a speed of the supplied lamella in the impact area of ​​the lamella on the movable, in particular rotatable, run-off surface. In one embodiment, the present invention achieves the above-mentioned objects with a method for producing glass, glass ceramic and / or glass ceramic material, comprising the steps - providing a lamella with a viscosity between 0.01 Pa s and 100 Pa s by a feed device, 30.07.2024 - feeding the provided lamella to at least one movable, in particular rotatable, run-off surface of a shaping device by means of the feed device, - providing a speed of the supplied lamella and a speed, in particular tangential speed of the movable, in particular rotatable, run-off surface relative to the lamella in the impact area of ​​the lamella on the run-off surface such that a speed,in particular tangential speed, of the movable, in particular rotatable run-off surface, 90% or more, preferably 95% or more, in particular 98% or more, preferably 99% or more and 200% or less, preferably 175% or less, in particular 150% or less, preferably 125% or less, in particular 120% or less, preferably 110% or less, in particular 105% or less, preferably 101% or less of the speed of the supplied lamella in the impact area of ​​the lamella on the movable, in particular rotatable run-off surface. In one embodiment, the present invention achieves the above-mentioned objects with a glass product produced from a glass melt comprising glass, glass ceramic and / or glass ceramic material, in particular produced with a device according to one of the device claims and / or with a method according to one of the method claims, wherein the glass product has at least one,preferably several, in particular all, of the following properties: - a roughness Ra on at least one side of the glass product of 0.1 nanometer or more, in particular 1 nanometer or more, preferably 10 nanometers or more, in particular 100 nanometers or more and 200 µm or less, preferably 100 µm or less, in particular 50 µm or less, preferably 30 µm or less, in particular 25 µm or less, preferably 20 µm or less, wherein the roughness is based on an area of ​​the glass product of 50x50 µm, 2 or more, preferably 100x100 µm 2 or more, especially 200x200 µm 2 or more, preferably 250x250 µm 2 or more, especially 500x500 µm 2 or more, preferably 750x750 µm 2 or more, preferably between 900x900 µm 2 and 1000x1000 µm 2 and less than 1000x1000 µm 2is specified - a liquidus viscosity of 100 Pa s or less and a crystal growth rate of 0.4 µm / min or more, preferably 0.5 µm / min or 30.07.2024 more, in particular 1.0 µm / min or more, in particular 2.5 µm / min or more, preferably 3.0 µm / min or more, in particular 4.0 µm / min or more, in particular 4.5 µm / min or more and / or 10.0 µm / min or less, preferably 7.5 µm / min or less, in particular 5.0 µm / min or less - at least one side of the glass product is fire-polished. In one embodiment, the present invention achieves the above-mentioned objects by using a glass product according to the use claim as cover glass or optical element in an augmented reality device. A glass product can be manufactured by means of the device according to one of the device claims and / or with a method according to one of the method claims.An augmented reality device can, for example, comprise augmented reality glasses. The term "glass" is to be understood in the broadest sense and includes, in particular in the claims and preferably in the description, glass, glass ceramic and / or glass ceramic material. The term "lamella" is to be understood in the broadest sense and refers, in particular in the claims and preferably in the description, to a glass ribbon and / or a glass layer which, from a glass melt in the liquid state, strike components of a device for further processing the lamella. The lamella should preferably be retained and not tear off, which is particularly problematic for glasses with a low liquidus viscosity. In the sense of the invention, a lamella is therefore understood to mean, in particular, the hot glass which is fed in particular to the melting device of the shaping device.Lamella here refers in particular to the area of ​​the glass material from leaving the feed device to the impact area. Subsequently, the glass and / or processed material is referred to as the substrate. July 30, 2024 One of the advantages achieved by the invention is that a stable lamella can be provided with a very low viscosity of the glass ribbon, which enables the production of a cost-effective glass product. A further advantage is that it enables efficient production and shaping of glasses with low viscosity. Further features, advantages and further embodiments of the invention are described below or become apparent thereby. According to an advantageous development, the feed device and shaping device are designed depending on the Ohnesorge number. for the lamella a minimum flow rate ^^̇^^ according to the formula where ^^^^ is the density of the lamella, B is the width of the lamella, D is the thickness of the lamella, η is the viscosity of the lamella, ^^^^ is the surface tension and the parameters a, b ≥ 0. The advantage of this is that a minimum throughput for a stable lamella can be provided in a particularly reliable manner for a wide variety of glass compositions, in particular those with a low viscosity at the feed temperatures. In principle, the higher the throughput, the more stable the lamella. However, a high throughput is difficult for handling the substrate. Therefore, the minimum throughput provided here is an advantageous compromise which, on the one hand, provides a stable lamella and, on the other hand, enables a rationally manageable throughput.Within the scope of this description and the claims, it generally applies that B and D are each measured at the point at which the glass and / or glass-ceramic material leaves the feed device, in particular immediately after leaving the nozzle, or in other words at the beginning of the lamella. 30.07.2024 According to a further advantageous development, the parameter a has a value between 5 and 500, preferably between 70 and 500, preferably between 100 and 400, preferably between 200 and 250, in particular 230, and that the parameter b has a value between 0 and 200, preferably between 25 and 200, preferably between 25 and 100, preferably between 50 and 90, in particular 83. The advantage of this is that a precise indication of a minimum throughput can be provided. According to a further advantageous development, the shaping device is designed such that the substrate has a viscosity of 10 when leaving the discharge surface. 2Pa s or more, especially 10 4 Pa s or more, preferably 10 5 Pa s or more, in particular 10 2 Pa s to 10 8 Pa s or of 10 2 Pa s to 10 5Pa s. The advantage of this is that sufficient processability of the glass ribbon is ensured after passing through the substrate. A further advantage is that the glass passes through the crystallization region quickly, so that crystal growth is reduced to a minimum or prevented, while the glass is still sufficiently formable to be deflected and / or reshaped. The said region includes, in particular, that the thickness of the substrate is adjusted by the shaping device, or that a pulling device is provided after leaving the run-off surface, by means of which the glass thickness is at least partially adjusted. According to a further advantageous development of the invention, the run-off surface is designed in the form of a rotatable roller and / or a movable conveyor belt and / or a movable chain. The advantage of this is a simple and cost-effective provision of a run-off surface.According to a further advantageous development of the invention, the substrate wraps around the rotatable run-off surface to at least 1%, preferably at least 2%, in particular at least 5%, preferably 10% or more and 75% or less, preferably 40% or less, in particular 25% or less, of the total circumference of the rotatable run-off surface. The advantage of this is that a greater influence on the substrate can be provided by means of the rotating run-off surface, for example in the form of cooling. 30.07.2024 According to a further advantageous development of the invention, the feed device has a slot-shaped nozzle, wherein the slot-shaped nozzle has a maximum width between 0.05 m and 4 m, in particular between 0.25 and 1 m, preferably between 0.3 m and 0.4 m, a maximum depth between 1 mm and 50 mm, preferably between 5 mm and 25 mm and a slot width between 0.2 mm and 5 mm, preferably between 1 mm and 3 mm.The advantage of this is that a sufficient throughput and, at the same time, a particularly stable lamella can be provided. According to a further advantageous development of the invention, a temperature control device is arranged for temperature control of at least the shaping device, in particular for cooling. The advantage of this is a particularly reliable provision of a substrate. The temperature control of the surface is particularly advantageous for controlling adhesives and adhesions on the run-off surface. According to a further advantageous development of the invention, the shaping device is designed to provide a contact time of the substrate with the run-off surface of 0.01 s or more, in particular 0.02 s or more, preferably 0.1 s or more, in particular 0.5 s or more and 10 s or less, preferably 5 s or less, in particular 2 s or less.One of the advantages achieved is that, for example, tempering can be adjusted using the shaping device according to the type of glass used and its crystallization behavior. According to a further advantageous development of the invention, the feeding device and shaping device are designed so that, depending on the Ohnesorge number, the tempering can be adjusted. for the lamella a minimum throughput according to the formula (see above) 30.07.2024 is provided, where ^^^^ is the density of the lamella, B is the width of the lamella, D is the thickness of the lamella, η is the viscosity of the lamella, ^^^^ is the surface tension of the lamella and the parameters a, b ≥ 0. The advantage of this is that a minimum throughput can be provided in a particularly reliable manner for a wide variety of glass materials. According to a further advantageous development of the invention, a value between 5 and 500, preferably between 70 and 500, preferably between 100 and 400, preferably between 200 and 250, in particular 230 is selected for the parameter a, and a value between 0 and 200, preferably between 25 and 200, preferably between 25 and 100, preferably between 50 and 90, in particular 83 is selected for the parameter b. The advantage of this is that an exact specification of a minimum throughput can be provided.According to a further advantageous development of the invention, the substrate wraps around the rotatable run-off surface to at least 1%, preferably at least 2%, in particular at least 5%, preferably 10% or more and 75% or less, preferably 40% or less, in particular 25% or less, based on the total circumference of the rotatable run-off surface. The advantage of this is that the substrate can be influenced more strongly by means of the rotating run-off surface, for example in the form of cooling. According to a further advantageous development, the contact time of the substrate with the run-off surface is selected to be 0.01 s or more, in particular 0.02 s or more, preferably 0.1 s or more, in particular 0.5 s or more and 10 s or less, preferably 5 s or less, in particular 2 s or less.One of the advantages achieved is that, for example, tempering can be adjusted using the shaping device according to the type of glass used and its crystallization behavior. According to a further advantageous development of the invention, the surface of the impinging lamella is fire-polished, particularly because the lamella is sufficiently hot and has a low viscosity. The advantage of this is that a particularly low surface roughness of the resulting glass product can be achieved.For example, a roughness Ra on at least one side of the glass product of 0.1 nanometer or more, in particular 1 nanometer or more, preferably 10 nanometers or more, in particular 100 nanometers or more and 200 µm or less, preferably 100 µm or less, in particular 50 µm or less, preferably 30 µm or less, in particular 25 µm or less, preferably 20 µm or less can be provided, wherein the roughness is based on an area of ​​the glass product of 50x50 µm. 2 or more, preferably 100x100 µm 2 or more, especially 200x200 µm 2 or more, preferably 250x250 µm 2 or more, especially 500x500 µm 2 or more, preferably 750x750 µm 2 or more, preferably between 900x900 µm 2 and 1,000x1,000 µm 2 and less than 1,000x1,000 µm 2is specified. According to a further advantageous development, at least one side of the glass product is fire-polished. The advantage of this is that a particularly high-quality glass product with low surface roughness can be provided. The process is particularly advantageously carried out in such a way that the substrate is fed to and / or subjected to a drawing process after contact with the forming tool. This has the advantage that the thickness of the glass substrate is finally adjusted during the drawing process. The initial adjustment is carried out via the forming tool, so to speak, and the fine adjustment via the drawing process. It has been shown that particularly good process stability can be achieved in this way, since fine adjustment of the thickness can be carried out independently of and without affecting the optimal setting of the lamella. Thicknesses of 10 µm to 3 mm are advantageously obtained, in particular from 30 µm to 3 mm or from 100 µm to 1 mm.In addition to the conditions and / or parameters mentioned for feeding the lamella to the forming device, the process control can be particularly advantageously adjusted so that the substrate meets one or more of the following conditions when leaving the forming device: - The relaxation time for reducing internal stresses is adjusted to avoid warping and / or cracking of the substrate. This is generally achieved by selecting a short relaxation time. 30.07.2024 - The viscosity of the substrate must be sufficiently low to correct the curvature of the forming tool; i.e., the substrate should be advantageously able to be formed flat or stretched after the forming tool. The stretching of the substrate can be associated with a reduction in thickness. Rollers in glass contact can be advantageous for this stretching.These can contact the glass before further cooling or only in the solid state, ie particularly advantageous in a viscosity range of >10. 7 Pa s or >10 12 Pa s). - Particularly advantageous is the viscosity of the substrate when leaving the drainage area in a range of 10 2 Pa s to 10 5 Pa s, especially from 10 2 Pa s to 10 4 Pa s, particularly advantageous in the range of 10 3 Pa s to 10 4Pa s. This allows, in particular, fire-polished surfaces on both sides and / or flat shapes and / or stretching with further thickness reduction to be achieved. To support the detachment process of the substrate from the forming tool, fluid nozzles or air nozzles can advantageously be used. Fluid nozzles can, in particular, convey gases to the substrate, in the simplest case, air, whereby the pressure of the fluid supports the detachment of the substrate. Accordingly, the fluid nozzle is, in the simplest case, an air nozzle. The substrate can be cooled after forming with an adapted cooling curve, in particular to adjust the specified viscosities. Further important features and advantages of the invention emerge from the subclaims, from the drawings and from the associated description of the figures. It is understood that the features mentioned above and those to be explained below are not only applicable in the respective combinations specified,but can also be used in other combinations or alone, without departing from the scope of the present invention. 07 / 30 / 2024 Preferred embodiments and embodiments of the present invention are illustrated in the drawings and are explained in more detail in the following description. Fig. 1 shows, in schematic form, a device according to an embodiment of the present invention; Fig. 2 shows steps of a method according to an embodiment of the present invention; Fig. 3 shows a diagram of the standardized throughput of a lamella as a function of the Ohnesorge number; Figs. 4a-4c show devices with a drawing process. Figure 1 shows, in schematic form, a device 1 for producing glass, glass ceramic and / or glass ceramic material. The device 1 comprises a feed device in the form of a slot-shaped nozzle 2 for forming and feeding a lamella 12 of a glass material,which here is in the form of a belt or a glass melt, for a shaping device 13. The lamella 12 has a viscosity between 0.01 Pa s and 100 Pa s. The lamella 12 falls in free fall from the nozzle 2 onto the shaping device 13 arranged below. The shaping device 13 has a run-off roller 3, which comprises a rotatable run-off surface 3a with a clockwise direction of rotation 6. Alternatively, the run-off surface 3a can also be designed as a movable belt or movable chain. In this case, the speed 8 of the movable, in particular rotatable, run-off surface 3a in the impact area 9 of the slat 12 on the run-off surface 3a corresponds to 90% or more, preferably 95% or more, in particular 98% or more, preferably 99% or more and 200% or less, preferably 175% or less, in particular 150% or less, preferably 125% or less, in particular 120% or less, preferably 110% or less,in particular 105% or less, preferably 101% or less of the speed 7 of the supplied lamella 12 in the impact area 9 of the lamella 12 on the run-off surface 3a. 30.07.2024 In general, for very low viscosities of the lamella 12, the impact speed of the lamella 12 on the run-off surface 3a corresponds to the sum of the exit speed of the lamella 12 from the nozzle 2 and the speed increase due to free fall. For higher viscosities, a substantially lower impact speed results, which can be determined experimentally. The speed of the lamella 12 upon impact on the run-off surface 3a can be determined by tracking bubbles,Particles or other markings in the glass melt or liquids with the same viscosity can be measured and / or determined by numerical calculations. As explained, for very low viscosities, the impact velocity of the lamella 12 corresponds in good approximation to the formula for a free fall of the lamella 12 with an initial velocity that essentially corresponds to the exit velocity from the nozzle 2. A deviation between the aforementioned impact velocity of the lamella 12 and the velocity of the movable run-off surface 3a can be provided. Smaller deviations towards slower velocities of the movable run-off surface 3a and larger deviations towards faster velocities of the movable run-off surface 3a relative to the velocity of the lamella 12 can be permitted, the latter, for example,to reduce the thickness of the lamella 12. The speed of the movable run-off surface 3a can correspond to 90% or more, preferably 95% or more, in particular 98% or more, preferably 99% or more and 200% or less, preferably 175% or less, in particular 150% or less, preferably 125% or less, in particular 120% or less, preferably 110% or less, in particular 105% or less, preferably 101% or less of the speed of the lamella 12. After impacting the rotatable run-off surface 3a, the lamella 12 is conveyed further by the latter, leaves the rotatable run-off surface as substrate 11 after passing through an angle θ of approximately 45 degrees, and is then conveyed horizontally by means of transport rollers 5 for further processing. The wrap angle θ can also have other values, for example, between 45 degrees and 235 degrees.preferably between 54 degrees and 216 degrees. 30.07.2024 The discharge roller 3 can - as shown here in Figure 1 - be connected to a temperature control device, here in the form of a cooling device 4. The cooling device 4 cools the discharge roller 3, or more precisely, the rotatable discharge surface 3a. Suitable cooling media can be used for the cooling device 4. In particular, oil and / or water and / or a water-air mixture are possible. In a further embodiment not shown here, the shaping device can also comprise a conveyor belt instead of a discharge roller 3.which transports the substrate 11. In this case, the conveyor belt can be arranged inclined at an angle to the horizontal. In a further embodiment not shown here, the shaping device can also have one or more belts and / or one or more run-off rollers. Figure 2 shows, in schematic form, steps of a method according to an embodiment of the present invention. Figure 2 shows, in schematic form, a method for producing glass, glass-ceramic and / or glass-ceramic material. The method comprises the steps of - providing S1 a lamella 12 with a viscosity between 0.01 Pa s and 100 Pa s by means of a feed device, - feeding S2 the provided lamella 12 to at least one movable, in particular rotatable run-off surface 3a of a shaping device 13 by means of the feed device, and - providing S3 a speed,in particular tangential speed of the movable, in particular rotatable discharge surface 3a relative to the outlet nozzle 2 in the impact area 9 of the lamella 12 on the movable, in particular rotatable discharge surface 3a such that a speed, in particular tangential speed of the movable, in particular rotatable discharge surface 3a 90% or more, preferably 95% or more, in particular 98% or more, preferably 99% or more and 200% or less, preferably 175% or less, in particular 150% or less, preferably 125% or less, in particular 120% or less, preferably 110% or less, in particular 105% or less, preferably 101% 30.07.2024 or less of the speed of the supplied lamella 12 in the impact area 9 of the lamella 12 on the movable,in particular, the rotatable discharge surface 3a. Figure 3 shows a diagram of the standardized flow rate of a lamella as a function of the Ohnesorge number. The standardized flow rate is defined as follows: where ^^̇^^ is the mass flow rate, B is the lamella width, ^^^^ is the surface tension, D is the thickness of the lamella, and ^^^^ is the density of the glass. Figure 3 shows a diagram 100, with the normalized flow rate M 101 on the y-axis and the Ohnesorge number Oh on the x-axis 102 on a logarithmic scale. The curve 204, which is essentially defined by the general formula is reproduced, represents the limiting flow rate 204 at which the corresponding lamella is just stable. Here, the areas 202, 203 of the diagram 100 represent stable areas in which the flow rate 101 of the lamella is stable as a function of the Ohnesorge number. These areas 202, 203 lie above the limiting flow rate 204. The area 201 below the limiting flow rate 204 represents the unstable area, i.e., as a function of the Ohnesorge number, the lamella is unstable here. Measurement points are given for the respective areas 201, 202, 203: points 205 for area 201, and 206 for area 202. 30.07.2024 Furthermore, the limiting cases “low viscosity”, in which the Ohnesorge number approaches 0, whereby the normalized throughput then has the value 1, reference symbol 207, and “high viscosity”, in which the Ohnesorge number approaches infinity, whereby the normalized throughput then runs inversely proportional to the Ohnesorge number, reference symbol 208, are shown. On the basis of corresponding tests, represented by points 3205, 206, the two freely selectable parameters a, b in the ^^^^( ^^^^ℎ) =1+ ^^^^∙ ^^^^ℎ1+ ^^^^∙ ^^^^ℎ. 3 + ^^^^∙ ^^^^ℎ 4 These are ^^^^ ≈ 230, ^^^^ ≈ 83 so that the marginal throughput 204 can be calculated as a function of the Ohnesorge number using the function can be described. In principle, the minimum throughput for a lamella of smaller thickness is smaller than the minimum throughput for a lamella of greater thickness. Figs. 4a to 4c schematically show embodiments of the device 1 and thus embodiments of the method in which a drawing process with a drawing device 500 is arranged downstream of the shaping device 13, as described. The shape and / or thickness of the substrate 11 and thus of the produced glass product is thus set in two stages, first in a preparatory manner by means of the shaping device 13 and then by means of the drawing device 500, which can in particular comprise one or more drawing rollers and / or drawing cylinders 51. The drawing, also called stretching, can simultaneously smooth the surface of the substrate 11 and thus of the produced glass product. 30.07.2024 The drawing rollers are in contact with the substrate 11, which is particularly cooled to such an extent that the contact does not result in any significant deformation of the substrate 11 and / or the produced glass product. The previously described conditions and / or parameters are also set in this two-stage process. As described, it is advantageously provided that in this two-stage process, the viscosity of the substrate 11 upon leaving the forming unit 13, i.e., upon leaving the discharge surface 3a, has a viscosity in the range of 10. 2 Pa s to 10 5 Pa s, especially from 10 2 Pa s to 10 4 Pa s, particularly advantageous in the range of 10 3 Pa s to 10 4Pa s. Fig. 4a shows an embodiment in which the substrate 11 is pulled from the run-off surface 3a, here by means of the two pulling rollers 51 which are in contact with the substrate 11. The distance between the point at which it leaves the run-off surface 3a and the pulling roller is the tempering section S, in which the substrate 11 is cooled and its viscosity is adjusted in such a way that the pulling roller 51 itself does not cause any undesired deformation of the substrate 11. Of course, at least in regions of the tempering section S, it can be provided that the substrate 11 is cooled or heated by suitable devices, for example with cooling units or ovens. The tempering sections are also present in the embodiments corresponding to Figs. 4b and 4c, but are not shown for the sake of clarity. The cooling or heating is also provided accordingly in the embodiments corresponding to these figures.Particularly advantageously, the tempering section S and / or the cooling or heating is designed such that the viscosity of the substrate 11 at the contact point with the drawing roller (51) is >10. 7 Pa s or >10 12Pa s. This also applies, of course, to all embodiments. The fluid nozzle 60 is arranged such that a fluid flow 601 originating therefrom is directed onto the substrate 11 near the run-off surface, in particular near the detachment point of the substrate 11 from the run-off surface 3a. The fluid flow exerts a pressure on the substrate 11, so to speak, so that the detachment from the run-off surface 3a is supported. It can also be provided to adjust the temperature of the fluid flow, in particular in interaction with the temperature control section, so that a desired heating and / or cooling profile of the substrate is achieved. As already described, the fluid can be any suitable fluid; in the simplest case, it is, for example, air, and the fluid nozzle 60 is then an air nozzle. In the embodiment according to Fig. 4a, gravity is also utilized in particular during the drawing process.in that the substrate 11 runs perpendicular to the pulling device from the point of detachment from the run-off surface 3a. This means that the point of detachment of the substrate 11 from the run-off surface 3a is particularly advantageously arranged vertically above the pulling device 500, in particular vertically above the center point between the two pulling rollers 51. In the embodiment according to Fig. 4b, a deflection roller 50 is used before the substrate 11 encounters the pulling device 500. This also makes at least partially horizontal arrangements of the device 1 possible. The deflection roller 50 further has the advantage of placing the substrate 11 under tension, whereby a good surface quality can be achieved and the process stability can be improved. Not shown is the optional fluid nozzle,which can of course also be provided here. The same applies to Fig. 4c. In the embodiment according to Fig. 4c, a deflection roller 50 is also used, which, due to its arrangement below the substrate 11, can also be referred to as a support roller. The previously mentioned advantages also apply to this embodiment. The glass products that can be produced using the device or the production method are based on the following possible compositions. 1. Composition 30.07.2024 All data below refer to wt. % on an oxide basis. SiO2 55-75, preferably 62-72 Al2O3 18-27 Li2O 2.8-5, preferably 3-5 Na2O 0-4, preferably 0-2 K2O 0-4, preferably 0-2 MgO 0-8, preferably 0-4 CaO 0-4, preferably 0-2 SrO 0-4, preferably 0-2 BaO 0-4, preferably 0-2 ZnO 0-6, preferably 0-2 TiO2O-4, preferably 0-3 ZrO2O-5, preferably 1.2-4 B2O3 0-2, preferably 0-0.1 In particular Fe2O3 0.0001 - 0.1, preferably 0.0001 - 0.02 SnO2O-2, preferably 0.05-1,6 wherein the following preferably applies to the sum of the components TiO2 and ZrO2: 0 < ∑ (TiO2 + ZrO2) < 9.5%, preferably 1.2 < ∑ (TiO2 + ZrO2) < 9.5%. wherein the following preferably applies to the components SnO2, ZrO2 and TiO2: 0 ≤ SnO2 / (ZrO2 + TiO2) < 0.8, preferably 0.01 ≤ SnO2 / (ZrO2 + TiO2) < 0.7. 2. Composition All information below refers to wt.% on an oxide basis. SiO2 57 to 69, preferably 59 to 69, particularly preferably 61 to 69, wherein the upper limit can preferably be 67 in each case, Al2O3 17 to 25, preferably 17 to 24, particularly preferably 17 to 21, B2O3 0 to 7, preferably 0 to 5, particularly preferably 0 to 4.5, Li2O 3 to 5.5, preferably 3.5 to 5.5, particularly preferably 3.5 to 5 30.07.2024 Na2O 0.3 to 7, preferably 0.3 to 6, particularly preferably 0.8 to 5.5, or even most preferably from 0.8 to 4.5, wherein preferably the sum of the contents of Al2O3 and SiO2, based on the indication in wt.%, is between at least 75 and at most 92, preferably at most 90,3. Composition All information below refers to weight percent on an oxide basis. SiO2 57 to 69, preferably 59 to 69, particularly preferably 61 to 69, wherein the upper limit can preferably be 67 in each case, Al2O3 17 to 25, preferably 17 to 24, particularly preferably 17 to 21, B2O3 0 to 7, preferably 0 to 5, particularly preferably 0 to 4.5, Li2O 3 to 5.5, preferably 3.5 to 5.5, particularly preferably 3.5 to 5, Na2O 0.3 to 7, preferably 0.3 to 6, particularly preferably 0.8 to 5.5, even more preferably 0.8 to 4.5, K2O 0 to 1, preferably 0 to 0.8, particularly preferably 0 to 0.7, MgO 0 to 2, preferably 0 to 1.5, particularly preferably 0 to 1, CaO 0 to 4.5, SrO 0 to 2, preferably 0 to 1.5, particularly preferably 0 to 1, ZnO 0 to 3, preferably 0 to 2, particularly preferably 0 to 1.5, P2O50 to 3, preferably 0 to 2, particularly preferably 0 to 1.7, ZrO20 to 3, preferably 0 to 2.8, particularly preferably 0-2.5, very particularly preferably 0-1, TiO2 0 to 3, preferably 0 to 2.8,particularly preferably 0-2.5, very particularly preferably 0-1, SnO2 0 to 2, preferably 0 to 1.5, particularly preferably 0-1, very particularly preferably 0-0.8, 30.07.2024 wherein impurities and / or refining agents and / or coloring components may also be present in amounts of up to 2 wt.%, and wherein the aforementioned SnO2 is a refining agent in the sense of the refining agent still present. 4. Composition All information below refers to wt.% on an oxide basis. Li2O 3.2-5.0 Na2O 0-1.5 K2O 0-1.5 ΣNa2O+K2O 0.2-2.0 MgO 0.1-2.2 CaO 0-1.5 SrO 0-1.5 BaO 0-2.5 ZnO 0-<1.5 Al2O3 19-25 SiO2 55-69 TiO2 1.0-5.0 ZrO2 1.0-2.5 SnO2 0-<1.0 ΣTiO2+ZrO2+SnO2 2.5-5.0 P2O5 0-3.0 5. Composition All information below refers to wt% on an oxide basis. Li2O 3.5-4.5 Na2O 0.2-1.0 07 / 30 / 2024 K2O 0-0.8 ΣNa2O+K2O 0.4+1.5 MgO 0.3-2.0 CaO 0-1.0 SrO 0-1.0 BaO 0-2.5 ZnO 0-1.0 Al2O3 19-24 SiO260-68 TiO2 1.0-2.0 ZrO21.2-2.2 Sn020-0.6 ΣTi02+ZrO2+Sn02 3.0-4.5 P2O5 0-2,0 6. Composition All information below refers to wt.% on an oxide basis. Li2O 3-5 Al2O315-25 SiO2 50-75 TiO21-5 ZrO21-2.5 SnO2 0-1 Σ TiO2, ZrO2 and SnO2 2.5-5 MgO 0.1-2.5 Na2O 0-1.5 K2O 0-1.5 Σ Na2O and K2O 0.2-2 CaO 0-2 SrO 0-2 BaO 0-3 30.07.2024 optionally with the addition of coloring components such as V, Cr, Mn, Fe, Co, Cu, Ni, Se, U compounds or mixtures thereof. 7. Composition All information below refers to wt.%. SiO2 6.0 to 35.0 B2O3 0.0 to 12.0 Nb2O5 10.0 to 55.0 TiO2 10.0 to 50.0 ZrO2 0.0 to 5.0 Al2O3 0.0 to 5.0 ZnO 0.0 to 12.0 CaO 0.0 to 12.0 BaO 0.1 to 35.0 SrO 0.0 to 8.0 Na2O 0.0 to 20.0 K2O 0.0 to 25.0 Sb2O3 0.0 to 2.0 As2O3 0.0 to 2.0 8. Composition All information below is given in cat.%: SiO2 > 0 to < 20.0 BO1.5 > 0 to < 20.0 TiO2 32.0 to 52.0 NbO2.5 4.0 to 15.0 ZrO2 0 to 11.0 30.07.2024 WO3 0 to 5.0 TaO2.5 0 to 5.0 AlO1.5 0 to 5.0 SbO2.5 0 to 0.5 AsO2.5 0 to 0.5 LaO1.5 13.0 to 28.0 GdO1.5 0 to 10.0 YO1.5 0 to 5.0 YbO1.5 0 to 5.0 9. Composition The following composition enables a glass product with a refractive index nd of 1.95 to 2.05 and a dispersion vd of 22 to less than 35, where the proportions are given in wt.%: SiO2 4 - 12 B2O3 4 – 11 BaO < 10 La2O3 30 - < 52 Gd2O3< 14 ZrO2< 5.5 TiO2 10 – 25 Nb2O5 3 – 16 ZnO ≤ 2.0 where the sum of the weight proportions of SiO2 and B2O3 is at least 10 wt.%. In summary, at least one of the embodiments of the invention can realize at least one of the following advantages and / or provide at least one of the following features: 30.07.2024 - simple parameterization of a stable lamella process. - low manufacturing costs. - faster manufacturing process. - high efficiency. The invention enablesto provide a stable lamella of thin liquid glass. The minimum throughput described is applicable for this purpose. Although the present invention has been described using preferred embodiments, it is not limited thereto, but can be modified in many ways.

[0002] 30.07.2024 List of reference symbols 1 Device 2 Slot nozzle 3 Discharge roller 3a Discharge surface 4 Cooling device 5 Transport roller 6 Direction of rotation 7 Speed ​​of lamella 8 Speed ​​of discharge roller 9 Impact area 10 Angle / Wrap angle 11 Substrate 12 Lamella 13 Shaping device 50 Deflection roller 51 Drawing roller 500 Drawing device 60 Fluid nozzle 601 Fluid flow S Tempering section 100 Diagram 101 Normalized throughput 102 Ohnesorge number 201 Unstable region , 203 Stable region 204 Limiting throughput 205 Unstable lamella 206 Stable lamella

Claims

30. 07.2024 Claims 1. Device for producing glass, glass ceramic and / or glass ceramic material, comprising a feeding device for feeding a lamella (11) of a glass and / or glass ceramic material with a viscosity between 0.01 Pa s and 100 Pa s to a shaping device (13), wherein the shaping device (13) comprises at least one movable, in particular rotatable run-off surface (3a), and wherein a speed, in particular tangential speed of the movable, in particular rotatable run-off surface (3a) is 90% or more, preferably 95% or more, in particular 98% or more, preferably 99% or more and 200% or less, preferably 175% or less, in particular 150% or less, preferably 125% or less, in particular 120% or less, preferably 110% or less, in particular 105% or less,preferably 101% or less of the speed of the supplied lamella (11) in the impact area (9) of the lamella (11) on the movable, in particular rotatable, run-off surface (3a), and the glass and / or glass-ceramic material leaves the run-off surface (3a) as the substrate (11).

2. Device according to claim 1, characterized in that the feed device and shaping device (13) are designed to be dependent on the Ohnesorge number (102), for the lamella (12) a minimum flow rate ^^̇^^ according to the formula where ^^^^ is the density of the lamella (12), B is the width of the lamella, D is the thickness of the lamella, η is the viscosity of the lamella (12), ^^^^ is the surface tension and the parameters a, b ≥ 0.

3. Device according to claim 2, characterized in that the parameter a has a value between 5 and 500, preferably between 70 and 500, preferably 30.07.2024 between 100 and 400, preferably between 200 and 250, in particular 230, and that the parameter b has a value between 0 and 200, preferably between 25 and 200, preferably between 25 and 100, preferably between 50 and 90, in particular 83.

4. Device according to one of claims 1-3, characterized in that the shaping device (13) is designed such that the substrate (11) has a viscosity of 10 when leaving the run-off surface (3a). 2 Pa s or more, especially 10 4 Pa s or more, preferably 10 5 Pa s or more, in particular 10 2 Pa s to 10 8 Pa s or of 10 2 Pa s to 10 5Pa s.

5. Device according to one of claims 1-4, characterized in that the run-off surface (3a) is designed in the form of a roller and / or a movable conveyor belt and / or a movable chain.

6. Device according to one of claims 1-5, characterized in that the substrate (11), based on the total circumference of a rotatable run-off surface (3a), wraps around the rotatable run-off surface (3a) to at least 1%, preferably at least 2%, in particular at least 5%, preferably 10% or more and 75% or less, preferably 40% or less, in particular 25% or less.Device according to one of claims 1-6, characterized in that the feed device has a slot-shaped nozzle (2), wherein the slot-shaped nozzle (2) has a maximum width between 0.05 m and 4 m, in particular between 0.25 and 1 m, preferably between 0.3 m and 0.4 m, a maximum depth between 1 mm and 50 mm, preferably between 5 mm and 25 mm and a slot width between 0.2 mm and 5 mm, preferably between 1 mm and 3 mm.

8. Device according to one of claims 1-7, characterized in that a temperature control device is arranged for temperature control of at least the shaping device (13), in particular for cooling.

9. Device according to one of claims 1-8, characterized in that the shaping device (13) is designed to have a contact time of the substrate (12). 30.07.2024 with the run-off surface (3a) of 0.01 s or more, in particular 0.02 s or more, preferably 0.1 s or more, in particular 0.5 s or more and 10 s or less, preferably 5 s or less, in particular 2 s or less.

10. Device according to one of claims 1-9, characterized in that a pulling device is arranged downstream of the shaping device (13) and preferably the substrate (11) has a viscosity in a range of 10 2 Pa s to 10 5 Pa s, in particular 10 2 Pa s to 10 4 Pa s, particularly preferably in the range of 10 3 Pa s to 10 4Pa s.

11. Device according to one of claims 1-10, characterized in that the shaping device (13) and / or the drainage surface (3a) is associated with a fluid nozzle for detaching the substrate (11).

12. A method for producing glass, glass ceramic and / or glass ceramic material, comprising the steps of - providing (S1) a lamella (12) having a viscosity between 0.01 Pa s and 100 Pa s by means of a feeding device, - feeding (S2) the provided lamella (12) to at least one movable, in particular rotatable run-off surface (3a) of a shaping device (13) by means of the feeding device, - providing (S3) a speed of the supplied lamella (12) and a speed, in particular tangential speed of the movable, in particular rotatable run-off surface (3a) relative to the lamella (12) in the impact area (9) of the lamella (12) on the movable, in particular rotatable run-off surface (3a) such that a speed,in particular tangential speed, of the movable, in particular rotatable run-off surface (3a) 90% or more, preferably 95% or more, in particular 98% or more, preferably 99% or more and 200% or less, preferably 175% or less, in particular 150% or less, preferably 125% or less, in particular 120% or less, preferably 110% or less, in particular 105% or less, preferably 101% or less of the speed of the supplied slat (12) in the impact area (9) of the slat, 30.07.2024 (12) on the movable, in particular rotatable, run-off surface (3a), and detaching the substrate (11) from the run-off surface (3a).

13. Method according to claim 12, characterized in that the feed device and shaping device (13) are designed such that, depending on the Ohnesorge number (102), for the substrate of the lamella (11) a minimum throughput according to the formula is provided, where ^^^^ is the density of the lamella (12), D is the thickness of the lamella, η is the viscosity of the lamella (12), ^^^^ is the surface tension and the parameters a, b ≥ 0.

14. The method according to claim 12 or 13, characterized in that for the parameter a a value between 5 and 500, preferably between 70 and 500, preferably between 100 and 400, preferably between 200 and 250, in particular 230, is selected and for the parameter b a value between 0 and 200, preferably between 25 and 200, preferably between 25 and 100, preferably between 50 and 90, in particular 83, is selected. 15.Method according to one of claims 12-14, characterized in that the substrate (11) wraps around the rotatable run-off surface (3a) to at least 1%, preferably at least 2%, in particular at least 5%, preferably 10% or more and 75% or less, preferably 40% or less, in particular 25% or less, based on the total circumference of a rotatable run-off surface (3a). 30.07.2024 16. The method according to any one of claims 12-15, characterized in that the contact time of the substrate (11) with the run-off surface (3a) is selected to be 0.01 s or more, in particular 0.02 s or more, preferably 0.1 s or more, in particular 0.5 s or more, and 10 s or less, preferably 5 s or less, in particular 2 s or less.

17. The method according to any one of claims 12-16, characterized in that the substrate (11) has a viscosity of 10 2 Pa s or more, especially 10 4 Pa s or more, preferably 105 Pa s or more, in particular 10 2 Pa s to 10 8 Pa s or of 10 2 Pa s to 10 5 Pa s.

18. Method according to one of claims 12-17, characterized in that the substrate (11) is drawn and / or stretched after leaving the run-off surface (3a), wherein preferably the viscosity of the substrate (11) when leaving the run-off surface (3a) has a viscosity in the range of 10 2 Pa s to 10 5 Pa s, in particular of 10 2 Pa s to 10 4 Pa s, particularly preferably in the range of 10 3 Pa s to 10 4Pa s.

19. The method according to claim 18, wherein the thickness of the substrate (11) is adjusted in two stages, firstly by the thickness of the substrate (11) upon leaving the run-off surface, in particular by adjusting the aforementioned parameters, and secondly by the subsequent drawing process.

20. The method according to claim 18 or 19, characterized in that during the drawing process, the substrate (11) is in contact with at least one drawing roller (51), wherein the viscosity of the substrate (11) at the point of contact with the drawing roller (51) is preferably >10 7 Pa s or >10 12 Pa s.

21. Method according to one of claims 12-20, characterized in that the detachment of the substrate (11) from the shaping device (13) and / or the run-off surface (3a) is assisted by a fluid flow (601), in particular a gas flow, directed onto the substrate (11), which in particular originates from a fluid nozzle (60), in particular an air nozzle. 30.07.2024 22. Method according to one of claims 12-21, characterized in that the surface of the tapered lamella (12) is fire polished.

23. Glass product made from a substrate comprising glass, glass ceramic and / or glass ceramic material, in particular produced using a device according to one of claims 1-11 and / or using a method according to one of claims 12-22, wherein the glass product has at least one, preferably several, in particular all, of the following properties: - A roughness Ra on at least one side of the glass product of 0.1 nanometer or more, in particular 1 nanometer or more, preferably 10 nanometers or more, in particular 100 nanometers or more and 200 µm or less, preferably 100 µm or less, in particular 50 µm or less, preferably 30 µm or less, in particular 25 µm or less, preferably 20 µm or less, wherein the roughness is based on an area of ​​the glass product of 50x50 µm 2or more, preferably 100x100 µm 2 or more, especially 200x200 µm 2 or more, preferably 250x250 µm 2 or more, especially 500x500 µm 2 or more, preferably 750x750 µm 2 or more, preferably between 900x900 µm 2 and 1,000x1,000 µm 2 and less than 1,000x1,000 µm 2is specified - a liquidus viscosity of 100 Pa s or less and a crystal growth rate of 0.4 µm / min or more, preferably 0.5 µm / min or more, in particular 1.0 µm / min or more, in particular 2.5 µm / min or more, preferably 3.0 µm / min or more, in particular 4.0 µm / min or more, in particular 4.5 µm / min or more and / or 10.0 µm / min or less, preferably 7.5 µm / min or less, in particular 5.0 µm / min or less, - at least one side of the glass product is fire polished.

24. Use of a glass product according to claim 23 as cover glass or optical element in an augmented reality device.

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