EP3883895A1 - Procédé et dispositif pour la fabrication de verre mince et bande de verre mince - Google Patents

Procédé et dispositif pour la fabrication de verre mince et bande de verre mince

Info

Publication number
EP3883895A1
EP3883895A1 EP19809404.7A EP19809404A EP3883895A1 EP 3883895 A1 EP3883895 A1 EP 3883895A1 EP 19809404 A EP19809404 A EP 19809404A EP 3883895 A1 EP3883895 A1 EP 3883895A1
Authority
EP
European Patent Office
Prior art keywords
thin glass
drawing rollers
glass
glass ribbon
thin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP19809404.7A
Other languages
German (de)
English (en)
Inventor
José ZIMMER
Holger Wegener
Alexander Storch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schott AG
Original Assignee
Schott AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Schott AG filed Critical Schott AG
Publication of EP3883895A1 publication Critical patent/EP3883895A1/fr
Pending legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B17/00—Forming molten glass by flowing-out, pushing-out, extruding or drawing downwardly or laterally from forming slits or by overflowing over lips
    • C03B17/06—Forming glass sheets
    • C03B17/068—Means for providing the drawing force, e.g. traction or draw rollers
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B17/00—Forming molten glass by flowing-out, pushing-out, extruding or drawing downwardly or laterally from forming slits or by overflowing over lips
    • C03B17/06—Forming glass sheets
    • C03B17/061—Forming glass sheets by lateral drawing or extrusion
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B17/00—Forming molten glass by flowing-out, pushing-out, extruding or drawing downwardly or laterally from forming slits or by overflowing over lips
    • C03B17/06—Forming glass sheets
    • C03B17/064—Forming glass sheets by the overflow downdraw fusion process; Isopipes therefor
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B17/00—Forming molten glass by flowing-out, pushing-out, extruding or drawing downwardly or laterally from forming slits or by overflowing over lips
    • C03B17/06—Forming glass sheets
    • C03B17/067—Forming glass sheets combined with thermal conditioning of the sheets
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B33/00—Severing cooled glass
    • C03B33/02—Cutting or splitting sheet glass or ribbons; Apparatus or machines therefor
    • C03B33/023—Cutting or splitting sheet glass or ribbons; Apparatus or machines therefor the sheet or ribbon being in a horizontal position
    • C03B33/0235—Ribbons
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/083—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
    • C03C3/091—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
    • C03C3/091—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium
    • C03C3/093—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium containing zinc or zirconium
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
    • Y02P40/57—Improving the yield, e-g- reduction of reject rates

Definitions

  • the invention relates generally to the manufacture of disk-shaped glass elements using hot molding processes.
  • the invention relates to the manufacture of very thin glasses.
  • One way to make very thin glasses is to thin out a thick glass sheet to the desired thickness.
  • the thinning can be done, for example, by etching.
  • An arrangement and a method for this are described, for example, in KR1020140007253 A.
  • WO 2008/093153 A1 describes a manufacturing process in which a hollow preform is inflated.
  • the thin glass produced in this way is initially hollow cylindrical and not flat, as is required for many applications.
  • the invention is therefore based on the object of simplifying the production of very thin glasses, increasing the stability of the production process and thereby also improving the quality of the thin glasses.
  • the invention provides a method for producing a flat thin glass ribbon, in which glass is melted and from which
  • the thin glass ribbon Extending tensile forces acting in the longitudinal direction, the thin glass ribbon is cooled after the exit until it falls below the glass transition temperature T g , and wherein the tensile forces are transmitted to the thin glass ribbon by at least two pairs of drawing rollers be, the two pairs of drawing rollers are arranged transversely to the pulling direction to grasp the thin glass ribbon on both sides in the area of its longitudinal edges between two drawing rollers, and wherein the contact of the thin glass ribbon with drawing rollers only occurs at a position at which the temperature of the glass is at most at or below 500 ° C.
  • a cooling device is provided to the leaked from the container
  • the device also has
  • the pulling device in order to exert a pull on the thin glass strip and thus pull out the thin glass strip to a thickness of at most 250 pm, the pulling device for exerting the tensile force,
  • the relevant temperature is the temperature at the point of contact between the drawing roller and the glass ribbon.
  • the pairs of drawing rollers are so far apart that they are not in the quality area or in the quality range of the glass ribbon, but work outside in the area that is later cut off in the process, so that the quality surface of the glass is not touched by drawing rollers .
  • the drawing rollers are arranged so far apart that they only touch areas on the edge, which are later separated as borders.
  • the glass transition temperature also known as the transformation point, is the temperature at which the glass changes from the viscous to the solid region.
  • the glass transition temperature Tg is typically near the upper cooling point with a glass viscosity of approximately 10 12 Pa s.
  • the temperature of 500 ° C, at which the glass of is touched the drawing rollers, is below the temperature of the lower cooling point for the glasses intended for processing and thus also below the glass temperature.
  • the double draw method and the overflow fusion method can be used for the method or the device.
  • the container is designed as an overflow channel, with the glass melt emerging at the top, running in two glass streams on both sides over the overflow channel, and the two of them
  • the container has an elongated nozzle from which the
  • the pulling rollers are arranged below the container, so that the pulling rollers exert a vertical pull on the thin glass ribbon moving downward.
  • the cooling distance between the nozzle and the position at which the glass temperature is reached can be kept short. This is advantageous in order to limit external influences on the glass ribbon thickness, such as vibrations that propagate along the thin glass ribbon.
  • the distance between the position of the temperature T g and the point from which the glass detaches from the container is less than 2 meters.
  • the point at which the glass separates from the container is given by the nozzle opening, or by the end of a sword inserted in the nozzle, at which the glass runs down. With the Overflow-Fusion-V experience, this point is given by the bottom of the container where the glass flows meet, merge and flow downwards. It is also advantageous if the distance between the point from which the glass detaches from the container and the contact point of the drawing rollers with the
  • Thin glass tape is in the range of 2 to 4 meters.
  • Preferred pulling speeds are between 0.4 meters per minute and 50 meters per minute.
  • the adjustment of the drawing speed to the glass thickness also proves to be particularly advantageous with regard to damping fluctuations in thickness.
  • the thin glass ribbon is pulled at a speed which is dependent on the thickness of the thin glass ribbon, so that the product of the pulling speed is given in meters per minute and the glass thickness is given in micrometers between 200 and 1000 (accordingly 2 * 10 4 m 2 / min to 10 * 10 4 m 2 / min).
  • the aforementioned product is preferably in a range from 200 to 900.
  • Fig. 1 shows schematically a device for the production of
  • Fig. 2 shows a variant in which the glass ribbon is drawn in the overflow fusion process.
  • Fig. 3 shows the arrangement of two pairs of rollers on the thin glass ribbon.
  • Fig. 4 is a diagram in which the amplitude of the thickness fluctuation
  • Thin glass tape is plotted as a function of the period of a fluctuation in the drawing speed.
  • 5 and 6 show thin glass strips with different thickness variations.
  • Fig. 7 shows a drawing roller with an elastomer jacket.
  • 1 schematically shows a preferred embodiment of a device 2 for producing a thin glass sheet 1.
  • the device 2 for producing a flat thin glass sheet 1 comprises a container 17 for receiving a glass melt 4. The molten glass emerges from the container and is drawn off downwards.
  • the container 17 has on its underside a nozzle 5, from which the glass melt 4 emerges.
  • the nozzle 5 is elongated or slit-shaped.
  • Fig. 1 shows the arrangement in the viewing direction of an edge of the glass ribbon.
  • the longitudinal extension of the nozzle 5 is accordingly perpendicular to the plane of representation here and therefore cannot be seen in the figure. If, as in the example shown, the glass is drawn off from a nozzle 5 which is open at the bottom, one speaks of a down-draw V experience.
  • a sword 50 is inserted into the nozzle and protrudes from the nozzle 5.
  • the glass melt flows along the sword 50 on both sides and the two partial flows combine at the lower end of the sword.
  • the thickness of the glass strip 1 decreases in the area from the end of the sword 50 until the glass 3 has become sufficiently firm in the course of the simultaneous cooling and is no longer deformed. This area of decreasing thickness is also referred to as the onion 6.
  • a cooling device 21 is provided in order to cool down the glass 3 in a controlled manner. It is important here that the cooling device 21 does not necessarily carry out active cooling. Rather, it serves to control the cooling process, possibly even to slow it down.
  • the cooling device can have heating devices in order to counteract cooling that is too rapid. It is advantageous here if the cooling can be controlled not only in the drawing direction but also transversely to the drawing direction, since it is precisely the transverse gradients of the temperature in the
  • 21 cooling / cooling modules are installed in the cooling device, which have a maximum dimension in the transverse direction of 100 mm, better 50 mm and preferably 25 mm. These can be controlled separately in order to be able to influence the temperature distribution. This gives that the temperature gradients across the glass ribbon can be reduced in the cooling process.
  • a thermal camera is installed after the cooling device according to a further development, which can measure the glass temperature transversely to the drawing direction of the glass ribbon. The temperature gradients in the glass ribbon are thus limited to max. 0.1K / cm. In this way, the glass ribbon maintains good thickness consistency and low tensions at the end and can be processed without breaking.
  • the glass 3 of the thin glass strip 1 is thus cooled down while it is moving in the pulling direction away from the nozzle 5 until it reaches the glass temperature T g at a position 30.
  • the device 2 also has a traction device 19 on the
  • Thin glass tape 1 to exert a train.
  • the tensile force extends along the thin glass strip 1 to the deformation zone or to the onion 6, so that
  • Thin glass ribbon 1 is thereby pulled out to a thickness of at most 250 pm.
  • a thin glass strip 1 with a thickness of at most 70 pm, or even at most 50 pm can also be drawn.
  • the thin glass strip 1 has a fire-polished surface with a correspondingly low roughness.
  • the roughness of the glass surface can be less than or equal to 5 nm, preferably less than or equal to 2 nm, more preferably at most 1 nm or even only at most 0.5 nm.
  • the pulling device 19 comprises at least two pairs of pulling rollers 1, 9, 11, 13 for exerting the pulling force, which are spaced apart from one another transversely to the pulling direction. Based on the representation of FIG. 1 with a view of the glass edges, the rollers are spaced perpendicular to the plane of the representation, so that a pair of
  • Drawing rollers 11, 13 is hidden by the other pair of drawing rollers 7, 9.
  • the drawing rollers 1, 9, 11, 13 are arranged downstream of the cooling device 21 and spaced so far from the nozzle 5 that the contact of the thin glass strip 1 with any of the drawing rollers 1, 9, 11, 13 only occurs at a temperature of the glass below the glass temperature T g .
  • the drawing rollers, viewed in the direction of movement of the thin glass strip 1, are only arranged behind the position 30.
  • the thin glass strip 1 can be deflected particularly advantageously into the horizontal and processed further with a horizontal feed. This is generally advantageous in order to, for example, the gravity acting on the glass for quiet and simple storage on a horizontal support device 33
  • a further processing is, for example, the separation of the trimmings 37 which arise when the thin glass ribbon is drawn, with a trimming separation device 35.
  • the trims 37 present themselves as thickened edge strips of the glass ribbon 1. These are often undesirable for the further processing, for example because the trims bend for this It is difficult to wind up the thin glass strip 1 into a roll.
  • the borders 37 can be separated, for example, by scoring and collected in a cullet. The glass of the borders can then be fed back into the glass melt and reused. As in the example shown, it is generally advantageous if the trims are cut off after the thin glass sheet 1 has passed through the pulling device 19, or that a braid separating device 35 is provided which is arranged downstream of the pulling device 19 in the direction of movement of the thin glass sheet 1.
  • the drawing rollers 1, 9, 11, 13 are preferably arranged on the edge side to such an extent that they do not touch the quality surface of the glass ribbon, but only the respective strips or edges 37 on the edge, which are arranged behind the drawing rollers in the running direction
  • Braid separation device 35 are separated. Without being limited to the example shown, the two pairs of drawing rollers 1, 9, 11, 13 are transverse to
  • the pulling direction is arranged so far apart that they only touch the thin glass ribbon 1 at the borders 37, or more generally the areas which are subsequently separated from the thin glass ribbon 1 by the border separation device 35.
  • Pull speed should be possible by avoiding synchronism fluctuations.
  • a train may move to a position where the glass is still is malleable, tensile stresses that arise behind the drawing rollers affect the thickness or more generally on the glass quality.
  • the contact of the thin glass strip 1 with drawing rollers 7, 9, 11, 13 takes place only at a position at which the temperature of the glass is at most at or below 500 ° C. It is conceivable that the glass ribbon still comes into contact with a component of the device above these drawing rollers, but this should then be so slight that the shape and surface of the glass ribbon remain essentially unaffected. For example, a light guide would be conceivable to stabilize the horizontal glass ribbon position. However, these should not exert significant forces. For example, at least 90% of the tensile forces that are transferred to the glass ribbon should be exerted by one or more pairs of drawing rollers with a contact point at a glass transition temperature of 500 ° C and less.
  • the drawing rollers grip the thin glass strip 1 at a position at which the temperature of the glass 3 is not only below T g , but less than 100 ° C. This position is also shown by way of example in FIG. 1.
  • Drawing rollers can damage the glass surface and due to the small
  • the drawing rollers are provided with a surface made of elastomeric material.
  • Embodiment is not necessarily limited to a temperature of the glass of at most 100 ° C, since high-temperature resistant elastomeric materials such as fluoroelastomers or silicones are known. Elastomeric surfaces generally adhere well to the glass. In addition, these materials can also dampen vibrations, which can lead to fluctuations in thickness due to propagation up to the onion 6.
  • Another advantage with a contact point of the drawing rollers at a temperature of 100 ° C. or less is that at this temperature not only the glass temperature, but also the upper and lower cooling point of the glass are generally fallen below. This will prevent the Pressure of the drawing rollers during the cooling process tensions are introduced and preserved in the glass.
  • the traction device 19 is open
  • Damping elements 39 are mounted in order to suppress the transmission of vibrations via the drawing rollers to the thin glass strip 1.
  • the pulling device 19 is in particular made as heavy as possible. Low-frequency vibrations with frequencies below 1 Hertz in particular can thus be damped. These vibrations prove to be particularly significant for thickness fluctuations.
  • the weight of the unit is a mass of at least 300 kg.
  • the drives 27 for the drawing rollers 1, 9, 11, 13 can be integrated in the pulling device 19, as shown in the example. With the installation of the traction device 19 on damping elements on the floor of the production building, a decoupling of vibrations in a supporting structure of the device 2 is achieved.
  • the transmission of vibrations to the thin glass band 1 with frequencies less than 1 Hertz by mechanical damping of elements that come into contact with the thin glass band 1 is attenuated at least 10 dB.
  • the traction device 19 is set up on the floor as shown.
  • the floor can also be a floor ceiling 29.
  • FIG. 2 shows a variant of the embodiment shown in FIG. 1. This variant differs essentially in the molding process of the
  • Thin glass ribbon 1 In the example of FIG. 1, the shaping is carried out, as mentioned, in a downdraw method by means of a nozzle 5 of the container 17 which is opened downwards.
  • the ribbon In the example shown in FIG. 2, the ribbon is shaped in the so-called overflow fusion method .
  • the container 17 is designed as a channel open at the top.
  • the Glass melt 4 is fed continuously, so that the glass melt 4 finally passes over the upper edge 18 and flows down along the outside of the container on both sides.
  • the two partial flows combine in the onion and are then pulled out to form a thin glass band 1 under the influence of the tensile forces exerted by the drawing rollers. Also in the embodiment shown in FIG.
  • the thin glass ribbon 1 is deflected from the vertical into the horizontal, a deflection roller 34 being used here.
  • a deflection roller 34 being used here.
  • a deflection can take place in which the thin glass band is in the transition region from the
  • Embodiment is particularly advantageous in order to avoid the transmission of vibrations and movements in the horizontal machining area to the drawing area, in particular to the drawing bulb 6. Accordingly, one is preferred
  • the thin glass ribbon 1 is freely suspended from the vertical deflected and continued horizontally. It is also particularly suitable to carry out processing steps that can generate vibrations or movements in a horizontal position of the thin glass strip 1.
  • the processing step that lends itself particularly to this is, as also shown, the separation of the borders. Accordingly, it is provided in a development of the invention that the thin glass ribbon 1 is preferably diverted freely suspended from the vertical and continued horizontally, with borders 37 being separated from the thin glass ribbon 1 in the horizontal position of the thin glass ribbon.
  • FIG. 3 shows the arrangement of the pairs of rollers 7, 9 and 11, 13 on the thin glass ribbon 1 in a perspective view for clarification.
  • the thin glass sheet 1 is in one by the pulling force exerted by the driven drawing rollers
  • Movement direction 40 moves in the longitudinal direction of the belt.
  • the pairs of drawing rollers are transverse to the direction of movement 40, and thus also transverse to
  • the longitudinal direction of the thin glass strip 1 is spaced apart.
  • the drawing rollers can grip the tape in the region of the longitudinal edges 23, 25, where borders 37 have formed through the drawing process.
  • the pulling of the thinnest glasses is also due to the im
  • Macroscopic scale no longer difficult material stiffness difficult. In this context, it turned out to be very favorable if the
  • the contact width 42 of the drawing rollers to the thin glass ribbon is narrow.
  • the contact width is the width in which the tensile forces are transmitted to the thin glass strip 1. In the example shown, this corresponds to the width of roll 7. This width does not necessarily have to correspond to the width of all rolls. For example, it is also possible to use pairs of different drawing rollers. If the pulling roller 9 were approximately twice as wide, the contact width 42 would not increase, since the tensile forces are essentially only transmitted in the area in which there is contact with the two opposite pulling rollers.
  • the drawing rollers 7, 9, 11, 13 are designed and arranged such that the contact width of a pair of drawing rollers along which tensile forces are transferred to the thin glass ribbon 1 is in the range from 10 mm to 50 mm. If the tensile forces are transmitted to the thin glass ribbon 1 with a pair of pulling rollers 1, 9, 11, 13 arranged opposite one another along a contact width 42 in the range mentioned above, shear stresses in the glass ribbon can be avoided. These shear stresses can otherwise lead to fold-like bulges due to the low rigidity of the glass ribbon. The one with it
  • the diameter of the drawing rollers are general, without limitation to the exemplary embodiments and independently of the one described above
  • Contact width values in the range from 40 mm to 250 mm are an advantage.
  • the diameter is preferably at most 200 mm.
  • a diameter in the range from 40 mm to 150 mm is particularly preferred.
  • FIG. 4 shows vibrations on the glass thickness of the thin glass strip.
  • the thickness response is plotted as a function of the period of the fluctuation in the drawing speed.
  • the amplitude of the response is given in micrometers and denotes the difference between the maxima and minima of the glass thickness caused by the periodic changes.
  • the period is given in minutes. With increasing Period there is initially a sharp increase, which reaches a plateau between periods of 10 seconds to 0.5 minutes. Here the answer does not depend significantly on the period. For even longer periods, the response increases again and converges to a value that represents the change in thickness at a constant 2% increase in pulling speed (v pull + 2%). This value is somewhat less than the thickness change at a one-time decreased by two percent stall speed (v pulling -2%).
  • Plateau i.e. relevant up to a period of about 10 seconds.
  • Thickness fluctuations due to slow vibrations that are transmitted in the longitudinal direction along the thin glass strip 1 are particularly evident in the case of thin glasses.
  • Thermal expansion coefficients at room temperature of a 9T0 6 K 1 pulled out to a thin glass tape.
  • the drawing rollers 1, 9, 11, 13 of the pulling device 19 can be in their position along the pulling direction or along the direction of movement of the
  • Thin glass ribbon 1 can be designed to be adjustable so that the distance between the drawing rollers and the onion 6, that is to say the distance from the hot-forming region of the thin glass ribbon 1, can be changed.
  • the distance is varied in the range of 2.2 meters to 3 meters from the onion.
  • a shorter distance is chosen for smaller glass thicknesses.
  • the distance can in particular be adapted to the temperature profile along the belt. As can be seen from the table, the distance between the upper cooling point and position 31, at which the glass has a temperature of 100 ° C., shortens.
  • the position of the drawing rollers along the direction of movement of the thin glass sheet is adjusted and thus adjusted to a position at which the thin glass sheet 1 reaches a predetermined temperature during cooling.
  • This position can, for example, correlate to the transformation point Tg, to the lower cooling point or also to the position at which the glass reaches a temperature of 100 ° C.
  • the position of the drawing rollers does not have to coincide with the positions mentioned above. A correlation to these positions can also mean that a certain distance between the contact point of the drawing rollers and one of these positions is maintained.
  • FIG. 5 and 6 show a perspective view of thin glass strips 1 which have process-related thickness variations.
  • FIG. 5 shows the thin glass ribbon 1 with the drawing rollers acting on the ribbon in a view corresponding to FIG. 3.
  • the thin glass ribbon 1 has two thickness variations in the form of thickenings.
  • the Maxima of the thickenings extend transversely to the thin glass strip 1 in the direction from one longitudinal edge 23 to the other longitudinal edge 25. This leads to a thickness variation 45 in the longitudinal direction of the thin glass strip 1.
  • These thickness variations in the longitudinal direction can be caused in particular by the low-frequency vibrations or fluctuations in the drawing speed explained above .
  • Fig. 6 shows another case.
  • the thin glass ribbon 1 is shown in perspective with a section perpendicular to the longitudinal direction.
  • the borders 37 can be clearly seen as edge areas thickened in relation to the central quality area 38 of the thin glass sheet 1.
  • a rib-shaped thickening extends along the longitudinal direction of the belt. Such a thickening then manifests itself in a thickness variation 46 in the transverse direction of the thin glass sheet 1.
  • both thickness variations 45 in the longitudinal direction and thickness variations 46 in the transverse direction can be reduced well.
  • the method described can be used to produce a particularly uniform, damage-free glass band.
  • a further aspect of this disclosure is provided with a thin glass strip 1 which can be produced using the method described here or the device and which has one
  • the glass ribbon 1 is accordingly free from pre-damage and residues caused by drawing rollers. Ceramic rollers used for pulling
  • Glass ribbons can be used, ceramic fibers and layered silicates,
  • the surface of the glass ribbon is free of these components, in particular also free of traces of layered silicates.
  • Further residues can arise from the temperature-resistant binder with which the fibers of the drawing rollers are held together. These residues can comprise one or more of the following materials: kaolin, alumina, bentonite, cordierite, mica.
  • a thin glass ribbon 1 in general, without limitation to the above-mentioned features of a pre-damage-free border, can be produced with the method described here or the device, which has a quality range with a constant thickness of at most 250 ⁇ m and two the edges of the Has thin glass ribbon 1 forming, compared to the quality range 38 braids 37, the dimensions of the braids 37 and
  • the added width of the borders 37 is less than 20 cm
  • the thin glass band has a width of at least 50 cm, preferably at least 60 cm.
  • Certain glasses are particularly suitable for the process in order to achieve small glass thicknesses and at the same time small glass thickness variations.
  • a preferred class of glasses contains the following components, details in
  • Sb 2 0 ⁇ can optionally be contained in an amount of 0.4-0.8 weight percent and / or Cf in an amount of 0.05 to 0.15 weight percent.
  • the glass is preferably free from alkaline earth oxides. Even alkali-free or low-alkali glasses can be processed.
  • a preferred class of such glasses contains the following components in percent by weight:
  • the method or the device is used to produce a thin glass strip 1, the composition of which contains the following components in percent by weight:
  • the glass may also contain 0 to 1% by weight: P205, SrO, BaO; and refining agents at 0 to 1% by weight: Sn02, Ce02 or As203 or other refining agents. Glasses with the composition range listed above are well suited for chemical tempering and can therefore be used for the production of highly break-resistant thin glass elements.
  • Lig. 7 shows one Drawing roller 7, with a tread 7 made of elastomeric material.
  • elastomers also have a certain disadvantage in that they have a slip that increases with increasing tensile forces. This can lead to changes in the drawing speed, which in turn manifests itself in thickness fluctuations. In order to keep this effect small, the drawing rollers have one
  • Embodiment a core 72 made of rigid material on which a jacket 71 made of elastomeric material is applied.
  • the thickness of the jacket is preferably not greater than 10 mm, in particular less than 8 mm.
  • the thickness of the casing 71 according to another embodiment is not more than 1/8 of this diameter. For example, with a roll diameter of 80 millimeters, a jacket 71 with a thickness of 5 mm can be provided.
  • a cooling device 73 can be provided to cool the tread 70, for example by the cooling device 73 using a tread
  • Thin glass elements that are cut out of a thin glass strip can be used to advantage for a number of applications.
  • the glasses can be used individually or in one
  • Composite material for displays in particular flexible displays, can be used.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
  • Glass Compositions (AREA)

Abstract

L'objet de la présente invention est de simplifier la fabrication de verres très minces, d'augmenter la stabilité du processus de fabrication et ainsi d'améliorer également la qualité des verres minces. À cet effet, l'invention concerne un procédé pour fabriquer une bande de verre mince plate (1), dans lequel du verre (3) est fondu et sort d'un récipient (17) guidant le bain de verre et est tiré vers le bas depuis le récipient jusqu'à la bande de verre mince (1) avec une épaisseur n'excédant pas 250 µm, sous l'action de forces de traction agissant dans le sens longitudinal de la bande de verre mince (1), la bande de verre mince (1) étant refroidie jusqu'à ce qu'elle passe en dessous de la température vitreuse Tg, et les forces de traction étant exercées sur la bande de verre mince (1) par au moins deux paires de rouleaux de traction (7, 9, 11, 13), les deux paires de rouleaux de traction (7, 9, 11, 13) étant disposées de manière espacée transversalement à la direction de traction afin de saisir des deux deux côtés la bande de verre mince (1) dans la zone de ses bords longitudinaux (23, 25), respectivement entre deux rouleaux de traction (7, 9, 11, 13), et le contact de la bande de verre mince (1) s'effectuant avec les rouleaux de traction (7, 9, 11, 13) seulement dans une position dans laquelle la température du verre est inférieure ou égale à 500 °C maximum.
EP19809404.7A 2018-11-21 2019-11-20 Procédé et dispositif pour la fabrication de verre mince et bande de verre mince Pending EP3883895A1 (fr)

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DE102018129349 2018-11-21
PCT/EP2019/081875 WO2020104497A1 (fr) 2018-11-21 2019-11-20 Procédé et dispositif pour la fabrication de verre mince et bande de verre mince

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US (1) US20210269347A1 (fr)
EP (1) EP3883895A1 (fr)
JP (1) JP7413379B2 (fr)
KR (1) KR102647478B1 (fr)
CN (1) CN113056442A (fr)
WO (1) WO2020104497A1 (fr)

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JP7413379B2 (ja) * 2018-11-21 2024-01-15 ショット アクチエンゲゼルシャフト 薄型ガラスおよび薄型ガラスリボンを製造するための方法および装置
DE102019120065A1 (de) * 2019-07-24 2021-01-28 Schott Ag Vorrichtung und Verfahren zur Herstellung von Glasbändern
DE102019120064A1 (de) * 2019-07-24 2021-01-28 Schott Ag Vorrichtung und Verfahren zur Herstellung von Glasbändern
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CN113643246B (zh) * 2021-07-29 2024-06-04 北京天和药玻科技有限公司 玻管拉管速度波动的监控装置和监控方法
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US20210269347A1 (en) 2021-09-02
CN113056442A (zh) 2021-06-29
JP7413379B2 (ja) 2024-01-15
WO2020104497A1 (fr) 2020-05-28
JP2022509134A (ja) 2022-01-20
KR20210094571A (ko) 2021-07-29
KR102647478B1 (ko) 2024-03-13

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