WO2013050166A1 - Verfahren zum schneiden eines dünnglases mit spezieller ausbildung der kante - Google Patents
Verfahren zum schneiden eines dünnglases mit spezieller ausbildung der kante Download PDFInfo
- Publication number
- WO2013050166A1 WO2013050166A1 PCT/EP2012/004172 EP2012004172W WO2013050166A1 WO 2013050166 A1 WO2013050166 A1 WO 2013050166A1 EP 2012004172 W EP2012004172 W EP 2012004172W WO 2013050166 A1 WO2013050166 A1 WO 2013050166A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- laser
- glass
- thin glass
- thin
- glass sheet
- Prior art date
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B29/00—Reheating glass products for softening or fusing their surfaces; Fire-polishing; Fusing of margins
- C03B29/04—Reheating glass products for softening or fusing their surfaces; Fire-polishing; Fusing of margins in a continuous way
- C03B29/14—Reheating glass products for softening or fusing their surfaces; Fire-polishing; Fusing of margins in a continuous way with vertical displacement of the products
- C03B29/16—Glass sheets
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B33/00—Severing cooled glass
- C03B33/08—Severing cooled glass by fusing, i.e. by melting through the glass
- C03B33/082—Severing cooled glass by fusing, i.e. by melting through the glass using a focussed radiation beam, e.g. laser
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B33/00—Severing cooled glass
- C03B33/09—Severing cooled glass by thermal shock
- C03B33/091—Severing cooled glass by thermal shock using at least one focussed radiation beam, e.g. laser beam
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B33/00—Severing cooled glass
- C03B33/09—Severing cooled glass by thermal shock
- C03B33/091—Severing cooled glass by thermal shock using at least one focussed radiation beam, e.g. laser beam
- C03B33/093—Severing cooled glass by thermal shock using at least one focussed radiation beam, e.g. laser beam using two or more focussed radiation beams
Definitions
- the invention relates to a laser-based method for separating thin glass, in particular a glass sheet, wherein the glass sheet after separation has a specially trained cutting edge with a very smooth and micro-crack-free surface.
- Consumer electronics for example, as cover glasses for semiconductor modules, for organic LED light sources or for thin or curved display devices or in areas of renewable energy or energy technology, such as
- Solar cells is increasingly used thin glass. Examples include touch panels, capacitors, thin-film batteries, flexible printed circuit boards, flexible OLEDs, flexible photovoltaic modules or even e-papers. Thin glass device for many
- Thin glass is understood to mean glass foils with thicknesses of less than approximately 1.2 mm. Due to its flexibility, thin glass is mainly used as a glass sheet
- the glass sheet can also after a
- glass as a brittle material has a rather low breaking strength, as it is less resistant to
- Tensile stresses is. When bending the glass, tensile stresses occur on the outer surface of the bent glass. For a break-free storage and for a break-free transport of such a glass roll or for a crack and breakage-free use of smaller glass sheet sections, first the quality and integrity of the edges is important in order to avoid the occurrence of a crack or breakage in the rolled or bent glass sheet. Nice
- Damage to the edges such as tiny cracks, e.g. Microcracks can be the cause and the point of origin for larger cracks or breaks in the glass sheet. Further, because of the tensile stress on the top of the rolled or bent glass sheet, integrity and freedom of the surface from scratches, scores, or other surface defects is important to avoid the occurrence of cracking or breakage in the rolled or bent glass sheet. Third, internal stresses in the glass due to production should also be as small as possible or absent in order to avoid the occurrence of a crack or break in the rolled-up or bent glass sheet.
- the nature of the glass sheet edge is special
- thin glasses or glass foils are mechanically scratched and broken with a specially ground diamond or a wheel made of special steel or tungsten carbide.
- scoring the surface targeted a voltage generated in the glass.
- the glass is controlled by pressure, tension or bending broken. This results in edges with high roughness, many micro cracks and
- the prior art in a further development uses the laser scribing method in order to break a glass substrate by means of a thermally generated mechanical stress.
- a collimated laser beam usually a C0 2 laser beam
- the glass is heated along a well-defined line and such a large thermal space is created by an immediately following cold jet of cooling fluid, such as compressed air or an air-liquid mixture
- WO 99/46212 makes a proposal for coating a glass sheet edge with a
- the coating can be done by dipping the glass edge in the plastic and curing with UV light. Protruding plastic on the outer surface of the glass is then removed.
- This method is proposed for glass sheets of 0.1 to 2 mm thickness.
- the disadvantage here is that it involves several complex additional process steps and is rather unsuitable for glass sheets in the range 5 to 250 pm. Above all, with such thin glass foils, a protruding plastic can not be removed without damaging the foil.
- coating the glass edge and even filling the microcracks as disclosed in WO 99/46212, prevents cracking and cracking only to a very limited extent
- a highly viscous plastic as proposed there, can due to its toughness microcracks in the surface structure of
- Coating process of an edge with plastic with thin glass foils in the range of 5 to 250 pm only very expensive implement Furthermore, it can not be avoided, especially in the case of very thin films, that the coating forms thickenings on the edge, which can not be removed without risk of damaging the film and which has a great adverse effect on use or in use
- the problem is that the Laser beam energy is absorbed by a part of the part which is reflected, for the most part by the glass, but as heat only in a very thin one
- DE 196 16 327 describes a method and a device for separating glass tubes with a wall thickness of up to 0.5 mm, wherein the glass tube is heated to a temperature above the glass transition temperature Tg in order subsequently to be able to sever the glass tube by means of a laser, with a high, reproducible quality of the ends.
- DE 196 16 327 does not describe the cutting through of thin glass panes or thin glass tapes.
- the glass tubes have always been reworked in DE 196 16 327, d. H.
- the glass tubes were initially cooled, were then heated, for example by a defocused laser beam immediately before the laser cutting beam and cut by the laser cutting beam.
- a separation for example in the context of a continuous production process is not described in DE 196 16 327.
- the wall thickness of the glass tubes to be cut are in
- JP 60 25 11 38 can not give any indication that a laser separation process without bead formation on the surface can also be used for thin-glass panes instead of conventional panes.
- Laser cutting made no temperature specifications. Also, no information is given about the bulges occurring at the edges.
- Cutting a thin glass, in particular a glass sheet allows while a cut edge quality of the thin glass provides that allows bending or rolling of the thin glass, wherein the formation of a crack from the cutting edge ago is largely avoided or completely avoided. In particular, a bulge should be avoided as much as possible.
- Thin glass pane in particular a glass sheet along a predetermined Separation line, wherein the dividing line immediately before the separation in a first embodiment has a working temperature of greater than 250 K (Kelvin) below the transformation point Tg of the glass of the thin glass pane, preferably greater than 100 K below Tg.
- K Kelvin
- Embodiment is the working temperature particularly preferably in a range of 50 K above and below Tg, particularly preferably in a range of 30 K above and below Tg, comprising the introduction of energy along the dividing line by means of a laser beam which acts in this way, that a separation of the thin glass pane takes place
- This method is particularly suitable for a thin glass in the form of a glass sheet having a thickness of at most 250 ⁇ , preferably at most 120 ⁇ , more preferably of at most 55 ⁇ , more preferably of at most 35 pm and for a glass sheet having a thickness of at least 5 ⁇ , preferably of at least 10 ⁇ , more preferably of at least 15 ⁇ .
- glass film is meant a thin glass in the thickness range of 5 to 250 pm.
- inventive method is also for thin glasses in
- Thickness range up to 1, 2 mm applicable.
- This method is also particularly suitable for a thin glass pane, in particular in the form of a glass film with an alkali oxide content of at most 2 wt .-%, preferably of at most 1 wt .-%, more preferably of at most 0.5 wt .-%, more preferably of at most 0.05% by weight, more preferably at most 0.03% by weight.
- This method is also particularly suitable for a thin glass pane, in particular in the form of a glass sheet made of a glass, the following
- Components (in% by weight based on oxide) contains:
- This method is furthermore particularly suitable for a thin glass pane, in particular in the form of a glass sheet made of a glass, which comprises the following
- Components (in% by weight based on oxide) contains:
- Alkaline earth oxides 1-30 Alkaline earth oxides 1-30
- such a thin glass in particular in the form of a glass sheet, is produced from a molten glass, especially low-alkali glass, in the down-draw process or in the overflow-downdraw-fusion process.
- a molten glass especially low-alkali glass
- both methods which are generally known in the prior art (cf., for example, WO 02/051757 A2 for the down-draw method and WO 03/051783 A1 for the overflow downdraw-fusion method) are particularly are suitable to thin glass sheets with a thickness of less than 250 ⁇ , preferably of less than 120 ⁇ , more preferably of less than 55 ⁇ , more preferably of less than 35 ⁇ and a thickness of at least 5 ⁇ , preferably of at least 10 ⁇ , more preferably of take off at least 15 ⁇ .
- the down-draw method described basically in WO 02/051757 A2
- Procedure flows bubble-free and well homogenized glass into a glass reservoir, the so-called drawing tank.
- the drawing tank is made of precious metals such as platinum or platinum alloys.
- a nozzle device with a slot nozzle is arranged below the drawing tank.
- the size and shape of this slot die defines the flow of the drawn out glass sheet as well as the thickness distribution across the width of the glass sheet.
- the glass sheet is made using drawing rollers at a speed depending on the glass thickness of 2 to 110 m / min. pulled down and finally passes through an annealing furnace, which adjoins the drawing rollers.
- the annealing furnace slowly cools the glass down to near room temperature to avoid strains in the glass.
- the speed of the drawing rolls defines the thickness of the glass sheet.
- the glass is bent from the vertical to a horizontal position for further processing.
- the thin glass has a fire-polished underside and top surface after being spread in its areal spread.
- fire polishing means that the glass surface forms during solidification of the glass during hot forming only through the interface to the air and is then changed neither mechanically nor chemically.
- the quality range of the thin glass thus produced thus has no contact with other solid or liquid materials during the hot forming.
- RMS root mean square
- the square root mean square value is understood to mean the quadratic mean value Rq of all distances of the actual profile measured within the reference path in the prescribed direction from a geometrically defined line which is set by the actual profile. Below the average roughness Ra, the arithmetic mean of the single roughnesses five becomes more adjacent
- the inventive method since it is a smooth and micro-crack-free
- the method can operate continuously. Thus, it can be used as a continuous process and a continuous online process at the end of the manufacturing process for separating the borders.
- the separation process is preferably performed so that it comes only to a small bead formation and thus surface irregularities.
- the thickening of the edges caused by the cutting is less than 25% of the glass thickness, preferably less than 10% of the glass thickness, in particular less than 5% of the glass thickness. Most preferably, the thickening of the edge caused by cutting is less than 25 ⁇ m, in particular less than 10 ⁇ m.
- the separation of the thin glass along a predetermined parting line is integrated into the manufacturing process of the thin glass in such a way that the heat energy to provide an optimal
- the thin glass or the glass sheet can be cut in a subsequent step into smaller sections or formats.
- a glass sheet is wound after its preparation on a roll and then to
- Finishing may include edge finishing (e.g., roll-to-roll operation) or trimming of the thin glass. Also for this purpose, the inventive method, since it is in a continuous process from the coming of the glass roller
- Endless belt can be used for separating smaller sections and formats and ensures a smooth and micro-crack-free cutting edge surface.
- the same processing speeds can be used here as in the case of use in the on-line process directly after shaping, but a lower processing speed can also be selected in coordination with the other process parameters, such as the laser wavelength, laser power and working temperature To optimize cutting edge surface texture.
- Optimized here is a cutting edge without thickening, ie the thickness of the cut edge corresponds to the thickness of the thin glass, as well as an extremely smooth, micro-crack-free surface.
- the method according to the invention can also be used as a discontinuous process in order to cut thin glasses, for example, from flat-layered thin-glass layers or to clean existing edges.
- the predetermined separation line of the thin glass is heated to a working temperature.
- the working temperature is the temperature which the region of the dividing line has, which is subsequently separated by means of laser energy input.
- the working temperature is according to the invention in a first embodiment preferably at a temperature of greater than 250 K (Kelvin) below the transformation point Tg of the glass of the thin glass pane, preferably greater than 100 K below Tg.
- the temperature is preferably in a range of 50 K. above and below Tg, more preferably in a range of 30 K above and below Tg.
- the transformation point (Tg) is the
- the laser radiation couples better into a hotter glass, but if the glass gets too low viscosity, the effect
- the working temperature is selected in coordination with the other parameters such that a micro-crack-free very smooth
- An edge thickening should be, for example, not more than 25% of the glass thickness, preferably not more than 15%, particularly preferably not more than 5% of the glass thickness.
- only an area around the dividing line is heated by means of a heat source, such as a burner or radiant heater.
- a heat source such as a burner or radiant heater.
- the energy input preferably takes place by means of a glass flame.
- the flame should burn as far as possible without soot.
- all combustible gases are suitable for this purpose, for example methane, ethane, propane, butane, ethene or natural gas.
- One or more burners can be selected for this purpose. It can burners with different flame training are used for this purpose, particularly suitable are line burner or individual lance burner.
- the thin glass is moved through an oven at a corresponding speed, which is adapted to the heating and separating process.
- the thin glass is heated by means of burners or an infrared radiation source or by means of heating rods as a heat radiation source.
- this can be a uniform and controlled temperature profile can be set in the thin glass, which in particular has a favorable effect on the stress distribution in the glass.
- a thin glass sheet may be placed in an oven and heated evenly.
- this is a CO2 laser, in particular a C0 2 - laser with a wavelength in the range of 9.2 to 11, 4 ⁇ ⁇ ⁇ , preferably of 10.6 ⁇ or a frequency-doubled C0 2 - laser.
- This can be a pulsed C0 2 laser or a continuous wave C0 2 laser (cw laser, continuous-wave laser).
- an average laser power P A v of less than 500 W, preferably of less than 300 W, particularly preferably of less than 200 W, is suitable for carrying out the method according to the invention.
- Cut edge quality is an average laser power of less than 100 W preferred, which is conducive to the formation of a good cut edge quality, but the cutting speed is low.
- an average laser pulse frequency f rep of 5 to 12 kHz (kilohertz) is preferred for carrying out the method according to the invention, in particular an average laser pulse frequency f rep of 8 to 10 kHz.
- a laser pulse duration t p of 0.1 to 500 ⁇ (microseconds) is preferred, in particular one
- Laser pulse duration t p from 1 to 100 ⁇ .
- Dividing line can be carried out according to the invention with any suitable laser.
- a YAG laser is preferred for this, in particular a Nd: YAG laser (neodymium-doped yttrium-aluminum-garnet solid-state laser) having a wavelength in the range from 1047 to 1079 nm (nanometers), preferably 1064 nm
- a Yb: YAG ytterbium-doped yttrium-aluminum-garnet solid-state laser
- Both types of lasers may also be preferred with frequency doubling (double) or frequency tripling (tripped).
- YAG lasers are used, in particular, with a high pulse frequency in the pico and nanosecond range for separating the thin glass, in particular a glass sheet, in the form of laser ablation in one
- Cut edge surface is also very smooth, but has a higher waviness compared to a separation of the glass with a C02 laser.
- Cutting edge is also free of microcracks and shows a low scattering of the strength values in the 2-point bending test.
- an excimer laser in particular an F 2 laser (157 nm), ArF laser (193 nm), KrF laser (248 nm) or an Ar laser (351 nm) is preferred.
- Such laser types can be used depending on the embodiment of the invention as a pulsed or continuous wave (continuous wave) laser.
- Thin glass in particular a glass sheet, along the dividing line with a processing speed Vf of 2 to 1 0 m / min., Preferably from 10 to 80 m / min., Particularly preferably from 15 to 60 m / min .. Die
- Processing speed when using the method in the on-line process is directly related to the shape of the thin glass depending on the glass ribbon speed in the production and the glass thickness.
- the processing speed for a thin glass of 100 pm thickness is 8 m / min, for a thin glass of 15 pm at 55 m / min.
- processing speeds of 15 to 60 m / min. prefers.
- Processing speed is the feed rate of the Dividing section along the dividing line understood.
- the thin glass can be guided along a fixed laser or the laser moves along a fixed thin glass or both move relatively
- the laser beam through an opening or by a for the
- Laser wavelength transparent window placed in the cover of the furnace. This protects the laser against a damaging influence of the working temperature and ensures that the temperature distribution of the thin glass, in particular in the region of the parting line, is not or only slightly influenced and a reliable control of the working temperature is made possible.
- a cut edge after separation has a fire-polished surface, but without thickening due to an effective surface tension on the entire edge. It is essential for this that the
- Cut edge surface only in a very small depth is melted or merge only small areas of the surface.
- such a cut edge after separation has an average roughness Ra of at most 2 nanometers, preferably of at most 1.5
- Nanometer more preferably of at most 1 nanometer, and a root mean square roughness (RMS) Rq of at most 1 nanometer,
- the thin glass in an oven preferably in a continuous furnace, of thermally generated stresses, which have arisen during the separation process, relaxed. It may happen that in one embodiment of the invention due to a
- the glass is expanded after being separated in a tempering furnace.
- the glass sheet for example, in a
- the alkali-free glass had the following composition in% by weight:
- the transformation temperature Tg of the glass is 717 ° C. Its density is 2.43 g / cm 3 .
- the square average roughness Rq of the top and bottom of the glass sheet is between 0.4 and 0.5 nm. The surface is therefore extremely smooth.
- the oven had a long hole at two positions on the top cover, through which one laser beam was focused at a point along the two dividing lines. Each slot extended parallel to the edges of the underlying glass sheet so that the edges could be cut accordingly. It was a continuous furnace, through which the glass sheet with a feed rate of 25 m / min. was moved through. The heating of the furnace was carried out electrically, so that the working temperature of each of the two dividing lines was 737 ⁇ 5 ° C.
- a pulsed CO2 laser with a wavelength of 10.6 pm was used as the energy source.
- the energy was delivered with a laser power of 200 W, a laser pulse frequency of 9 kHz and a laser pulse duration of 56 ps
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Optics & Photonics (AREA)
- Thermal Sciences (AREA)
- Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
- Laser Beam Processing (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201280049426.5A CN103857636B (zh) | 2011-10-07 | 2012-10-05 | 用于切割带有特殊的棱边构造的薄玻璃的方法 |
DE112012004176.3T DE112012004176A5 (de) | 2011-10-07 | 2012-10-05 | Verfahren zum Schneiden eines Dünnglases mit spezieller Ausbildung der Kante |
KR1020147011631A KR20140075769A (ko) | 2011-10-07 | 2012-10-05 | 특수 에지 형성부를 갖는 얇은 유리의 절단 방법 |
JP2014533800A JP5897138B2 (ja) | 2011-10-07 | 2012-10-05 | 縁部が特殊に形成された薄手ガラスを切断する方法 |
US14/246,708 US20140216108A1 (en) | 2011-10-07 | 2014-04-07 | Method for cutting thin glass with special edge formation |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102011084128A DE102011084128A1 (de) | 2011-10-07 | 2011-10-07 | Verfahren zum Schneiden eines Dünnglases mit spezieller Ausbildung der Kante |
DE102011084128.8 | 2011-10-07 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/246,708 Continuation US20140216108A1 (en) | 2011-10-07 | 2014-04-07 | Method for cutting thin glass with special edge formation |
Publications (1)
Publication Number | Publication Date |
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WO2013050166A1 true WO2013050166A1 (de) | 2013-04-11 |
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ID=47073401
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2012/004172 WO2013050166A1 (de) | 2011-10-07 | 2012-10-05 | Verfahren zum schneiden eines dünnglases mit spezieller ausbildung der kante |
Country Status (7)
Country | Link |
---|---|
US (1) | US20140216108A1 (de) |
JP (1) | JP5897138B2 (de) |
KR (1) | KR20140075769A (de) |
CN (1) | CN103857636B (de) |
DE (2) | DE102011084128A1 (de) |
TW (1) | TWI485118B (de) |
WO (1) | WO2013050166A1 (de) |
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Also Published As
Publication number | Publication date |
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JP5897138B2 (ja) | 2016-03-30 |
JP2015502898A (ja) | 2015-01-29 |
DE102011084128A1 (de) | 2013-04-11 |
DE112012004176A5 (de) | 2014-07-10 |
US20140216108A1 (en) | 2014-08-07 |
KR20140075769A (ko) | 2014-06-19 |
CN103857636A (zh) | 2014-06-11 |
TW201321321A (zh) | 2013-06-01 |
CN103857636B (zh) | 2017-12-29 |
TWI485118B (zh) | 2015-05-21 |
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