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
• • 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
  • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
  • C03B33/00—Severing cooled glass
  • C03B33/07—Cutting armoured, multi-layered, coated or laminated, glass products
  • C03B33/074—Glass products comprising an outer layer or surface coating of non-glass material
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
  • C03B35/00—Transporting of glass products during their manufacture, e.g. hot glass lenses, prisms
  • C03B35/14—Transporting hot glass sheets or ribbons, e.g. by heat-resistant conveyor belts or bands
• • 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
  • C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
  • C03C17/001—General methods for coating; Devices therefor
  • C03C17/002—General methods for coating; Devices therefor for flat glass, e.g. float glass
• • 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
  • C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
  • C03C17/28—Surface treatment of glass, not in the form of fibres or filaments, by coating with organic material
  • C03C17/32—Surface treatment of glass, not in the form of fibres or filaments, by coating with organic material with synthetic or natural resins
• • 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
  • C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
  • C03C17/28—Surface treatment of glass, not in the form of fibres or filaments, by coating with organic material
  • C03C17/32—Surface treatment of glass, not in the form of fibres or filaments, by coating with organic material with synthetic or natural resins
  • C03C17/328—Polyolefins
• • 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
  • C03C2218/00—Methods for coating glass
  • C03C2218/30—Aspects of methods for coating glass not covered above
  • C03C2218/355—Temporary coating

Definitions

• the invention relates to a method for producing individual glass panes, in particular for use in electronic devices, by pulling a glass ribbon vertically downwards, coating the glass ribbon with a protective layer, drying and / or crosslinking the protective layer, deflecting the glass ribbon and cutting the glass ribbon. Furthermore, the invention relates to a device for producing individual glass panes, in particular for use in electronic devices by pulling a glass ribbon vertically downwards.
• Single glass panes such as those produced using the generic method, are used as substrate glass for electronic devices, such as for displays of portable telephones, for flat screens or for mass storage of computers.
• the individual glass panes can also be used as substrate glass for glass keyboards or as substrate glass for glass-metal laminates or for glass-plastic laminates.
• the glass panes Since these applications are mass products, the glass panes have to be manufactured as inexpensively as possible, i.e. that high process stability with high throughputs and low waste is sought. High throughputs are achieved through high drawing speeds and large bandwidths, and low waste is aimed at using narrow borders and cutting optimization in accordance with previously recognized glass defects.
• the production of the individual glass panes can be optimized in such a way that costly postprocessing process steps, such as grinding and polishing in particular, are eliminated or reduced.
• a high level of process stability can only be achieved if the glass ribbon does not tear off during production. If the glass ribbon is torn off, the production systems are contaminated with glass particles, so that the requirements for the cleanliness of the surface can no longer be met. In addition, the glass particles can damage the surface of the glass ribbon, so that further tears of the glass ribbon are induced due to the resulting reduction in breaking strength. Therefore, the entire production system must be cleaned if the glass ribbon is torn off. As a result, production has to be interrupted for several hours.
• the glass ribbon is coated in a vertical position to protect its surface with a protective layer.
• This protective layer is intended to prevent contamination by particles and damage to the surface. Existing injuries can heal through the coating. It also serves as protection against splintering and increases the breaking strength of the glass ribbon.
• the coating material is applied by rolling, spraying or other suitable processes. Depending on the coating material, this is followed by drying and / or crosslinking of the protective layer. This can be supported by infrared emitters, hot air dryers or UV emitters.
• the protective layer is dried and / or crosslinked, for example by additional heat or radiation, so that it shrinks onto the glass ribbon. This creates a compressive stress on the surface of the glass ribbon. This compressive stress additionally increases the breaking strength of the glass ribbon.
• the shrinkage can also be influenced by a suitable choice of the coating material. Plastics in particular have a wide variety of shrink properties. The compressive stress generated by the shrinkage should advantageously compensate for the tensile stress occurring during deflection. By optimizing the shrinkage, the likelihood of breakage is drastically reduced, especially when deflecting. This increases process stability and cost efficiency.
• the breaking strength of the glass tape achieved through the protective coating not only increases the process stability.
• smaller deflection radii can be set than with uncoated glass strips.
• the process plants can be designed with a smaller space overall.
• the glass ribbon is deflected from the vertical position into the horizontal position after coating and drying and / or crosslinking.
• the deflection of the glass ribbon is necessary so that the specified manufacturing tolerances can be adhered to when cutting, in particular when cutting to length.
• Cutting can be done by conventional scoring and breaking or by laser cutting.
• Coating with polyvinyl alcohol with an average molecular weight> 55,000 g / mol and a degree of hydrolysis> 95% has proven particularly suitable.
• the coating can be removed by washing with water at a temperature of 50 ° C and higher.
• the removal of the polyvinyl alcohol layer by washing with water is very gentle on the one hand, so that the glass breakage is small even with very thin glasses, and on the other hand very thorough since the coating is completely removed. Since the surface quality, which was given immediately after the glass tape had been pulled off and cooled, was preserved in this quality, polishing of individual glass panes protected in this way can be omitted before final assembly. This is particularly important when using single glass panes in displays.
• the glass ribbon cannot be supported only at the borders, as is customary, but also in the middle area between the borders, the so-called net area, without the quality of the surface being adversely affected thereby.
• This increases the process stability and glass panes with large widths, in particular> 1 m, can also be processed safely in a horizontal position.
• the coating of the glass band can also support the cutting of the borders and / or the singling, if necessary when cutting to the final dimension in which the glass band can also be used in the net area, without adversely affecting the quality of the surface.
• the cut is made directly to the final dimension.
• the quality of the glass is measured online immediately after the cooling of the glass ribbon to a temperature below the lower cooling point, preferably below 200 ° C.
• the thickness, the thickness distribution across the glass ribbon, the streak as a measure of the fine waviness and the internal quality of the glass can be measured. This information is e.g. used to control the hot forming process.
• a cutting optimization is carried out according to the invention by taking the results of the online measurement into account when cutting. Faulty glass sections are recognized during online measurement. These are preferably marked and the marking is used to control the cutting process. The yield is significantly increased by this cutting optimization.
• the device according to the invention is characterized in that a coating device and a drying and / or crosslinking device are arranged in front of the deflection device.
• the coating unit can have, for example, nozzles for spraying the coating or rollers for rolling the coating on.
• the drying and / or crosslinking device can have, for example, an infrared radiator or a hot air dryer and for crosslinking it can have a UV Have spotlights.
• Various devices can be combined with one another.
• the device in its deflection device has means for supporting the glass band on the borders and, in particular in the case of large bandwidths, also between the borders.
• These means are advantageously designed as roller conveyors. This increases the process stability when the glass ribbon is deflected and also allows reliable processing of large bandwidths.
• the at least one roller conveyor pivotable. It should be designed such that it deflects the glass ribbon in one position and separates the deflecting device from the cutting device in another position. This can e.g. prove to be advantageous during the start-up process. While the first few meters of the glass ribbon are being drawn, the first roller conveyor is then in the position in which it separates the deflection device from the cutting device. The glass ribbon is therefore not deflected, but instead fed and broken in a vertical position, for example to a broken glass. By separating the cutting device from the deflection device, the roller conveyor prevents glass particles, which originate from the broken glass ribbon, from contaminating the cutting device. Only after the start-up process has ended, i.e. If the glass ribbon fulfills the required quality criteria, the at least one roller conveyor is pivoted into the other position, in which it deflects the glass ribbon from the vertical to the horizontal and feeds it to the cutting device.
• the drawn and sufficiently cooled glass ribbon first passes through a measuring device.
• the measuring device is used to measure the glass quality.
• the measuring device can have several measuring units, each measuring different properties. For example, the thickness and the thickness distribution across the glass ribbon could be measured with a measuring unit, the internal quality of the glass could be determined with the measurement of bubbles and inclusions with a further unit and with another measuring unit the drawing streak could be measured as a measure of the fine ripple become.
• the online measuring device and the cutting device are preferably coupled, so that the measurement information is used to control the cutting device.
• the online measuring device is designed, for example, in such a way that it provides the glass ribbon with markings in accordance with the glass defects.
• the cutting device has a measuring unit for reading out these markings. The information from the markings is used to control the cutting device.
• the online measuring device and the cutting device are connected to one another via an evaluation and / or control device.
• the evaluation and / or control device can be integrated in the online measuring device and / or cutting device.
• external markings on the glass ribbon can be dispensed with entirely.
• the markings can still be made and additional information can be passed on from the online measuring device via the evaluation and / or control device to the cutting device in order to optimize the cutting process.
• Fig. 1 is a schematic representation of an embodiment of the device as a section.
• a device according to the invention is shown schematically in section.
• the size of the device extends over three floors: the second floor 93 with the cooling shaft 21, the first floor 92 with a drawing machine 22, measuring device 3, coating device 41 and drying device 42 and the ground floor 91 with deflection device 5, cutting device 6 and conveyor belt 7. Below this the broken cellar 82 is arranged three floors.
• the glass melting tank (not shown here), to which the pulling device 2 is connected, is arranged above the second upper floor 93.
• the drawing device 2 only the cooling shaft 21 and the drawing machine 22 already on the first floor 92 are shown in the present illustration.
• the glass ribbon 1 which is pulled vertically downward, is guided through the cooling shaft 21, where it is cooled down to approximately 200 ° C.
• the glass ribbon 1 passes through the bottom drawing machine 22.
• the quality of the glass is determined using the measuring device 3. For this purpose, the thickness distribution across the belt direction is determined, bubbles and inclusions are detected and the pulling streak is measured as a measure of the fine ripple.
• the defective glass ribbon sections are provided with markings which are read out by a measuring unit arranged in the cutting device 62 for the purpose of cutting control. In addition, the measurement data are immediately in an evaluation and control device, not shown here evaluated and used to control the cutting device 62. After the quality of the glass ribbon 1 has been checked, the glass ribbon 1 is sprayed on both sides in the coating unit 41 with polyvinyl alcohol.
• a polyvinyl alcohol with a molecular weight of 150,000 g / mol and a degree of hydrolysis of 99% is used for this. This has a viscosity of 28 ⁇ 0.5 mPas in 4% aqueous solution at 20 ° C.
• a 5% solution is used for processing. This is made as follows. 1 part by weight of polymer powder is introduced into 19 parts of cold deionized water. The suspension is heated to 90 ° C. with stirring in a water bath until completely dissolved. After everything has dissolved, the mixture is cooled to room temperature with stirring. The coating on both sides is carried out by spraying the solution heated to 70 ° C. using the high-volume, low-pressure process with 70 ° C.
• the coating is dried in the drying unit 42 using gas infrared radiators to accelerate the drying process. Drying times of ⁇ 60 seconds are achieved.
• radiation in the wavelength range between 3 and 10 ⁇ m has proven to be particularly suitable, as it is e.g. is generated by gas dark emitters. Alternatively, the use of electric spotlights is also possible.
• the thickness of the coating is approximately 5 ⁇ m.
• the glass ribbon itself has a thickness of 0.7 mm.
• the glass ribbon 1 is deflected from the vertical position into the horizontal position by means of the deflection device 5. A deflection radius of 1 m is observed.
• a variety of rollers are provided, one of which is pivotable Form roller conveyor 51 on which the glass ribbon 1 rests in its entire width, ie also in the net area between the borders.
• the roller conveyor 51 of the deflection device 5 is swung out.
• the glass ribbon 1 is fed to the broken glass cellar 82 and broken in the process by means of a broken glass 83.
• the cutting area is separated from the drawing shaft area. This prevents contamination of the cutting area with glass particles during start-up.
• the method and the device according to the invention allow the start-up process to be shortened, since sufficient glass quality for carrying out the manufacturing process has already been determined at an earlier point in time and allow the hot forming of the manufacturing process to be stabilized.
• the glass ribbon 1 After the glass ribbon 1 has been transferred into the horizontal, the glass ribbon 1, supported by rollers 72, passes through the conventional cutting machine 61 with the conventional cutting wheels 63.
• the conventional cutting machine 61 is used only for the start-up process.
• the glass ribbon 1 is then fed to the laser cutting machine 62.
• the laser cutting machine 62 separates the two borders with the first laser unit 64 and separates the glass strip 1 to the final dimension with the aid of the second laser unit 65.
• the glass strip 1 and the separated glass panes are also supported in the net area by a moving belt 71.
• the isolated individual glass panes are fed to the packaging station via the conveyor belt 7.

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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)
• Surface Treatment Of Glass (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=7653023

Family Applications (1)

Country Status (7)

Cited By (12)

Families Citing this family (16)

Citations (7)

Family Cites Families (4)

• 2000
  • 2000-08-16 DE DE10040640A patent/DE10040640C2/de not_active Expired - Fee Related
• 2001
  • 2001-08-16 CN CN01814254A patent/CN1447778A/zh active Pending
  • 2001-08-16 KR KR1020037002032A patent/KR100720894B1/ko not_active IP Right Cessation
  • 2001-08-16 WO PCT/EP2001/009432 patent/WO2002014229A1/de active Application Filing
  • 2001-08-16 JP JP2002519331A patent/JP2004505881A/ja active Pending
  • 2001-08-16 TW TW090120115A patent/TWI255803B/zh not_active IP Right Cessation
  • 2001-08-16 AU AU2001287688A patent/AU2001287688A1/en not_active Abandoned

Patent Citations (8)

Non-Patent Citations (3)

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