WO2013011877A1 - 板ガラス、その製造方法、および、その製造装置 - Google Patents
板ガラス、その製造方法、および、その製造装置 Download PDFInfo
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- WO2013011877A1 WO2013011877A1 PCT/JP2012/067622 JP2012067622W WO2013011877A1 WO 2013011877 A1 WO2013011877 A1 WO 2013011877A1 JP 2012067622 W JP2012067622 W JP 2012067622W WO 2013011877 A1 WO2013011877 A1 WO 2013011877A1
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- WIPO (PCT)
- Prior art keywords
- glass
- plate
- plate glass
- fusing
- airflow
- Prior art date
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Classifications
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/36—Removing material
- B23K26/40—Removing material taking account of the properties of the material involved
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B25/00—Annealing glass products
- C03B25/04—Annealing glass products in a continuous way
- C03B25/06—Annealing glass products in a continuous way with horizontal displacement of the glass products
- C03B25/08—Annealing glass products in a continuous way with horizontal displacement of the glass products of 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/50—Inorganic material, e.g. metals, not provided for in B23K2103/02 – B23K2103/26
Definitions
- the present invention relates to a plate glass, a manufacturing method thereof, and a manufacturing apparatus thereof.
- a method for producing a plate glass by cutting a glass plate a method is known in which a groove line is formed on the surface of the glass plate with a cutter, a bending stress is applied, and the glass plate is cut along the groove line.
- the plate glass obtained by cleaving is supplied to a subsequent process after chamfering corners.
- a method using a grindstone is generally used, but if a corner portion of a plate glass is chamfered with a grindstone, a fine crack is formed on the chamfered surface. This fine crack leads to a decrease in bending strength.
- the step of cutting the glass plate and the chamfering step of chamfering the corners of the plate glass obtained by cutting are performed separately as in the prior art, the efficiency is low and the manufacturing cost of the plate glass is increased.
- the glass plate is locally heated with a laser beam and melted, but the glass does not have a clear melting point, and the viscosity gradually decreases as the temperature rises. It was difficult to obtain a desired chamfered shape because the heated portion was softened and hanged down due to gravity.
- the present invention has been made in view of the above-mentioned problems, and provides a plate glass having a desired shape with low manufacturing cost and excellent impact resistance and appearance, and a manufacturing method and a manufacturing apparatus suitable for the plate glass.
- the purpose is to provide.
- the present invention provides: It is a plate glass having a molten cross section formed by irradiation of laser light on its side surface,
- the molten cross section of the plate glass has a rounded shape at least at a corner portion that intersects with one main surface of the plate glass and a corner portion that intersects with the other main surface of the plate glass 10. If the radius of curvature at an arbitrary position is r and the thickness of the central portion of the plate glass is t, a plate glass satisfying the expression 1/3 ⁇ t ⁇ r ⁇ 2/3 ⁇ t is provided.
- the present invention also provides: In the manufacturing method of plate glass having a fusing step of fusing the glass plate by moving the irradiation position of the laser beam and the blowing position of the airflow on the surface of the flat glass plate,
- the fusing step is a step of fusing the glass plate into two and forming at least both corners of one or both of the melt sections into rounded shapes, respectively.
- the laser beam is linearly formed along the moving direction, and when the length along the moving direction is L and the width is W, 10 ⁇ L / Provided is a method for producing a plate glass satisfying the formula of W ⁇ 60.
- the present invention provides A laser beam emitted from the laser light source on the surface of the glass plate supported by the support body that supports the flat glass plate, a laser light source that emits laser light, a nozzle that ejects airflow, and the glass plate supported by the support body
- the fusing device is a device for fusing the glass plate into two and forming at least both corners of one or both of the melt sections in a rounded shape
- the laser beam is linearly formed along the moving direction, and when the length along the moving direction is L and the width is W, 10 ⁇ L /
- An apparatus for producing sheet glass that satisfies the formula of W ⁇ 60 is provided.
- the present invention it is possible to provide a plate glass having a desired shape that is low in manufacturing cost and excellent in impact resistance and appearance. Moreover, the manufacturing method and manufacturing apparatus suitable for this plate glass can be provided.
- FIG. 1 The figure when the plate glass by one Embodiment of this invention is seen from the direction where a fusion cross section extends.
- Phase contrast photomicrograph when the plate glass according to one embodiment of the present invention is viewed from the direction in which the melt cross section extends The electron micrograph when the plate glass by one Embodiment of this invention is seen from the direction where a melt cross section extends.
- the figure which shows the modification of FIG. 1 is a side view showing a partially broken plate glass manufacturing apparatus according to an embodiment of the present invention.
- the side view which expands and shows the principal part of the fusing device by one Embodiment of this invention The front view which expands and shows the principal part of the fusing device by one Embodiment of this invention It is a top view which expands and shows the principal part of the fusing apparatus by one Embodiment of this invention, Comprising: The top view which shows the positional relationship of the laser beam and airflow on the plane containing the surface of a glass plate Explanatory drawing of the fusing process of the part used as the product after fusing by one embodiment of the present invention Illustration of impact strength tester
- FIG. 1 is a view of a plate glass according to an embodiment of the present invention when viewed from a direction in which a molten cross section extends.
- the plate glass 10 has a molten surface 12 formed on the side surface by irradiation with laser light.
- it can be judged using a phase-contrast microscope or an electron microscope whether the side surface of the plate glass 10 is a molten surface.
- FIG. 2 is a phase contrast micrograph when the plate glass according to one embodiment of the present invention is viewed from the direction in which the melt cross section extends.
- the portion 13 near the melting section 12 of the plate glass 10 has a refractive index different from that of the peripheral portion 14, and bright and dark stripes due to direct light and diffracted light are not clearly seen.
- bright and dark stripes due to direct light and diffracted light are clearly seen in the chamfered portion by the conventional fire polish method.
- FIG. 3 is an electron micrograph of the plate glass according to one embodiment of the present invention as viewed from the direction in which the melt cross section extends.
- the portion 13 near the melting section 12 of the plate glass 10 has a reflectance different from that of the peripheral portion 14, and contains B 2 O 3 which is a volatile component compared to the peripheral portion 14.
- the amount is lower by 1% by mass or more.
- the content of B 2 O 3 hardly decreases in the portion chamfered with the conventional grindstone.
- the molten cross section 12 of the plate glass 10 has a rounded shape at least at a corner portion 16 that intersects one main surface 15 of the plate glass 10 and a corner portion 18 that intersects the other main surface 17 of the plate glass 10.
- the “main surface” of the glass plate means a so-called front surface and back surface
- the “rounded shape” means a so-called R shape, and faces outward in a cross section perpendicular to the main surface. It is a convex curved surface shape, and includes an arc surface shape having a single radius of curvature, an arc surface shape composed of a plurality of arc surfaces having different curvature radii, an elliptical arc surface shape, and the like.
- the molten cross section 12 of the plate glass 10 may be formed in a convex curved shape as a whole, or may have a flat surface in part.
- the rounded portion of the side surface of the glass sheet 10 is formed by fusing, so that it has excellent impact resistance compared to the case where it is formed by mechanical polishing as in the prior art.
- S / t can be made larger than 0.043 J / mm.
- the melting section 12 of the plate glass 10 is 1/3 ⁇ t ⁇ r ⁇ 2/3 ⁇ , where r is the radius of curvature at an arbitrary position of each corner 16, 18 and t is the thickness of the central portion of the plate glass 10. Satisfies the expression of t.
- the center part of glass here refers to the part which is not influenced by fusing except the outer edge part remelted by fusing, and the plate
- the radius of curvature r is a radius of curvature when viewed from the direction in which the melt cross section extends.
- the melting section 12 of the plate glass 10 is an arc surface.
- the molten cross section 12 has a circular arc shape protruding outward in a cross section perpendicular to the main surface.
- the melt cross section 12 has a central portion in the plate thickness direction protruding outward from both ends in the plate thickness direction.
- the melted surface 12 is an arc surface having a single radius of curvature, resistance to impacts in various directions is increased.
- the molten cross section 12 of the plate glass 10 is formed so that the protrusion amount H in the plate thickness direction is 0.1 mm or less with respect to the central portion of the plate glass 10.
- the protrusion amount H is the amount of sag from the lower surface (the main surface located on the lower side) of the glass sheet 10 that is horizontally disposed during fusing.
- the plate thickness t at the center of the plate glass 10 is, for example, 0.05 to 1.0 mm, depending on the use of the plate glass 10. If the plate thickness t exceeds 1.0 mm, fusing is difficult. Further, when the plate thickness t is less than 0.05 mm, handling is difficult.
- the use of the glass sheet 10 is not particularly limited, but for example, for a display display that displays images such as still images and moving images.
- the display display includes a flat panel display such as a liquid crystal display (LCD), a plasma display (PDP), and an organic EL display (OLED), and a touch panel display.
- the plate glass 10 is used as, for example, a glass substrate on which a display element is provided, or a cover glass that protects the front surface of the display.
- the type of glass constituting the plate glass 10 is selected according to the use of the plate glass 10.
- the plate glass 10 when used as a glass substrate for PDP or a cover glass, the plate glass 10 is made of soda lime glass.
- the plate glass 10 when used as a glass substrate for LCD, the plate glass 10 is made of alkali-free glass that does not substantially contain an alkali metal element.
- alkali-free glass examples include SiO 2 : 50 to 66%, Al 2 O 3 : 10.5 to 24%, B 2 O 3 : 0 to 12%, MgO: 0 in terms of mass percentage based on oxide.
- the molten section 12 is an arc surface, but the present invention is not limited to this.
- the melting section 22 of the plate glass 20 shown in FIG. 4 is composed of a curved surface and a flat surface. In short, it is only necessary that at least both corners of the molten cross section be formed in a rounded shape.
- FIG. 5 is a side view showing a partially broken plate glass manufacturing apparatus according to an embodiment of the present invention.
- the plate glass manufacturing apparatus 100 includes a heat treatment apparatus 200, a fusing apparatus 300, and an annealing apparatus 400.
- the glass plate 30 is conveyed to the heat treatment apparatus 200, the fusing apparatus 300, and the annealing apparatus 400 in this order.
- the glass plate 30 is preheated by the heat treatment apparatus 200 and then melted by the fusing apparatus 300, and is divided into a part 40 that is a product and a part 50 that is not a product (a so-called ear part, see FIG. 8).
- the product portion 40 is annealed by the annealing apparatus 400.
- the glass plate 30 may be divided into two parts, even if both parts are product parts. Good.
- the heat treatment apparatus 200 includes a heat treatment furnace 210 for heat treating the glass plate 30 at a temperature higher than room temperature.
- a heat treatment furnace 210 for heat treating the glass plate 30 at a temperature higher than room temperature.
- the preheating temperature of the glass plate 30 is set lower than the softening point of the glass plate 30, and is preferably 700 ° C. or lower in the case of alkali-free glass.
- the heat treatment furnace 210 is constituted by an electric furnace or a gas furnace.
- the heat treatment furnace 210 may be a batch type or a continuous type.
- the heat treatment furnace 210 may be a continuous tunnel furnace as shown in FIG. There is no restriction on the temperature distribution inside the tunnel furnace.
- the temperature may be set so that the temperature gradually decreases from the inlet to the outlet, or the temperature gradually increases from the inlet toward the inside. It may be set so that the temperature gradually decreases from the outlet toward the outlet.
- a transport roll 220 for transporting the glass plate 30 horizontally from the entrance to the exit is provided inside the heat treatment furnace 210.
- a plurality of transport rolls 220 are provided at intervals in a predetermined direction, and are each a drive roll that is rotationally driven by a motor or the like, and transports the glass plate 30 in a predetermined direction. Note that some of the transport rolls 220 may be passive rolls.
- a forming apparatus for forming molten glass into a strip shape may be adjacent to the inlet side of the heat treatment furnace 210.
- the molding apparatus include a so-called float molding apparatus and a fusion molding apparatus.
- the float forming apparatus is an apparatus for causing molten glass continuously supplied onto molten tin in a float bath to flow on molten tin and forming it into a strip shape.
- the fusion molding device continuously supplies molten glass into the inside of a bowl having a substantially V-shaped cross section, and the molten glass overflowing from the bowl to the left and right sides is merged at the lower edge of the bowl to form a strip. Device.
- the strip-shaped glass sheet formed by the forming apparatus is carried into the heat treatment furnace 210.
- the fusing device 300 cuts the glass plate 30 to a predetermined size. For example, the fusing device 300 blows off the side edge portion (so-called ear portion) of the belt-like glass plate 30 formed by the forming device. The part excluding the ears is the product. Thereby, the same plate glass as the plate glass 10 shown in FIG. 1 is obtained.
- the fusing device 300 locally heats the glass plate 30 with the laser light 312 emitted from the laser light source 310 and blows away the melted portion by heating with the airflow (assist gas) 322 ejected from the nozzle 320.
- the glass plate 30 is melted.
- the fusing device 300 includes a transport roll 330 that transports the glass plate 30 in a predetermined direction.
- the transport roll 330 has the same configuration as the transport roll 220 provided inside the heat treatment furnace 210. The details of the fusing device 300 will be described later.
- the annealing apparatus 400 includes an annealing furnace 410 that anneals a sheet glass (that is, a product portion 40) obtained by fusing in order to relieve residual strain caused by local heating during fusing.
- the annealing furnace 410 has the same configuration as the heat treatment furnace 210.
- a transport roll 420 for transporting the plate glass 40 from the inlet toward the outlet is provided inside the annealing furnace 410.
- the transport roll 420 has the same configuration as the transport roll 220 provided in the heat treatment furnace 210.
- the plate glass manufacturing apparatus 100 includes the heat treatment apparatus 200, the fusing apparatus 300, and the annealing apparatus 400. However, as long as the fusing apparatus 300 is provided, the plate glass manufacturing apparatus 100 does not include the heat treatment apparatus 200 or the annealing apparatus 400. May be.
- FIG. 6 is an enlarged side view showing a main part of the fusing device according to one embodiment of the present invention.
- FIG. 7 is an enlarged front view showing a main part of the fusing device according to one embodiment of the present invention.
- FIG. 8 is an enlarged plan view showing a main part of the fusing device according to one embodiment of the present invention, and is a plan view showing the positional relationship between laser light and airflow on a plane including the surface of the glass plate.
- the fusing device 300 includes a support (for example, a transport roll 330 in FIG. 5, not shown in FIGS. 6 to 8) that supports the flat glass plate 30, a laser light source 310 that emits laser light 312 and a laser.
- the glass plate 30 is locally heated by the laser light 312 emitted from the laser light source 310, the glass plate 30 is blown by blowing off the melted portion by the air current 322 ejected from the nozzle 320.
- the fusing device 300 moves the glass plate 30 by moving the irradiation position of the laser beam 312 and the blowing position of the air current 322 on the surface 32 of the glass plate 30 supported by the support.
- the movement of the irradiation position of the laser beam 312 and the blowing position of the airflow 322 on the surface 32 of the glass plate 30 may be performed by movement of the glass plate 30 or by movement of the laser light source 310 and the nozzle 320. Or both.
- the glass plate 30 is divided into a portion 40 that becomes a product and a portion 50 that does not become a product (see FIG. 8) after fusing.
- the part 40 that is a product is larger than the part 50 that is not a product.
- the support body supports the glass plate 30 and supports the glass plate 30 horizontally, for example.
- the support may be composed of, for example, a plurality of transport rolls 330 shown in FIG. 5, or may be composed of a plate-like stage, an air table, or the like, and there is no limitation on the configuration.
- the support does not support the fusing position of the glass plate 30 as shown in FIG. 5 so that the airflow 322 passes through the glass plate 30. That is, a space is arranged below the fusing position of the glass plate 30 so that the airflow 322 passes through the glass plate 30.
- the laser light source 310 emits laser light 312 under the control of the control device 350.
- the oscillation method of the laser light source 310 there is no limitation on the oscillation method of the laser light source 310, and a CW laser that continuously oscillates the laser beam 312 or a pulse laser that intermittently oscillates the laser beam 312 is used.
- the intensity distribution of the laser beam 312 is not limited, and may be a Gaussian type or a top hat type.
- Examples of the laser light source 310 include CO 2 laser (wavelength 10600 nm), semiconductor laser (wavelength 808 nm, 940 nm, 975 nm), fiber laser (wavelength 1064 nm, 1070 nm), Nd: YAG laser (wavelength 213 nm, 266 nm, 355 nm, 532 nm, 1064 nm), KrF excimer laser (wavelength 248 nm), ArF excimer laser (wavelength 193 nm), F 2 laser (wavelength 157 nm), Kr 2 laser (wavelength 146 nm), Ar 2 laser (wavelength 126 nm), and the like.
- CO 2 laser in which the laser beam 312 is easily absorbed as heat by the glass is preferable.
- the optical system 360 includes, for example, a mirror 362 and a lens 364.
- the mirror 362 reflects the laser light 312 emitted from the laser light source 310 toward the lens 364.
- the lens 364 images the laser light 312 reflected by the mirror 362 on the surface 32 of the glass plate 30.
- a cylindrical lens or the like is used to make the cross-sectional shape of the laser light 312 into a linear shape having a high aspect ratio such as an elliptical shape or a rectangular shape.
- the optical axis of the laser beam 312 that has passed through the lens 364 is orthogonal to the surface 32 of the glass plate 30.
- the cylindrical lens is used to make the cross-sectional shape of the laser light 312 into a linear shape having a high aspect ratio such as an elliptical shape or a rectangular shape.
- a mask may be used.
- the mask is made of a thin plate having a through hole through which the laser beam 312 passes, and the cross-sectional shape of the laser beam 312 can be defined by the shape of the through hole.
- the nozzle 320 injects the air current 322 under the control of the control device 350.
- the airflow 322 is composed of a gas such as air or an inert gas.
- a compressed gas source such as a compressor or a cylinder is connected to the nozzle 320.
- a heater 321 (see FIG. 5) is attached to the nozzle 320 in order to heat the airflow 322 passing through the nozzle 320.
- the nozzle 320 is arranged above the portion 40 that becomes a product after fusing, and injects an air flow 322 obliquely toward the fusing position of the glass plate 30.
- the nozzle 320 may be disposed above the fusing position of the glass plate 30.
- the nozzle 320 is arranged so as to blow an air flow 322 toward the fusing position of the glass plate 30 from the outside in the width direction of the laser beam 312 or from the front in the moving direction of the laser beam 312. It is desirable.
- the angle ⁇ (see FIG. 7) formed by the center line of the nozzle 320 and the direction orthogonal to the surface 32 of the glass plate 30 is preferably 0 to 35 °.
- the angle ⁇ (see FIG. 8) is preferably 0 to 90 ° (where ⁇ > 0).
- the shape of the outlet of the nozzle 320 is not limited, but it is formed, for example, in a circular shape, and the outlet diameter (diameter) of the nozzle 320 is preferably 1 to 3 mm, more preferably 1 to 2 mm.
- the flow rate and the wind pressure of the air flow 322 can be optimized.
- the flow rate of the air flow 322 is preferably 10 to 30 L / min, more preferably 15 to 20 L / min.
- the outlet temperature of the nozzle 320 is preferably room temperature to 800 ° C., more preferably 600 to 800 ° C. The higher the outlet temperature of the nozzle 320, the higher the temperature of the airflow 322, so that the output of the laser light source 310 can be reduced.
- the distance between the outlet of the nozzle 320 and the surface 32 of the glass plate 30 is preferably 1 to 5 mm from the viewpoint of the directivity of the airflow 322 and the like.
- the moving device 340 is a device that moves the irradiation position of the laser beam 312 and the blowing position of the airflow 322 on the surface 32 of the glass plate 30 supported by the support.
- the moving device 340 includes a drive source such as a rotary motor that drives the support.
- the moving apparatus 340 of this embodiment drives a support body and moves the glass plate 30, this invention is not limited to this.
- the processing head on which the laser light source 310 and the nozzle 320 are mounted may be moved, or both the glass plate 30 and the processing head may be moved.
- the control device 350 includes a microcomputer.
- the control device 350 controls the output of the laser light source 310, the output of the nozzle 320, and the output of the moving device 340.
- FIG. 9 is an explanatory diagram of a part that becomes a product after fusing according to an embodiment of the present invention.
- the fusing device 300 cuts the glass plate 30 into two pieces, and forms at least both corners 47 and 48 in a rounded shape in the fusing surface 42 of one (part 40 which becomes a product after fusing). To do.
- the corner portion 47 is a portion that intersects one main surface 45 of the portion 40
- the corner portion 48 is a portion that intersects the other main surface 46 of the portion 40.
- limiting in the shape of the melted surface 52 (refer FIG. 8), The shape same as the melted surface 42 may be sufficient, and the shape different from the melted surface 42 may be sufficient. .
- the laser beam 312 is formed linearly along the moving direction (arrow A direction), for example, linearly. Yes.
- a plane including the surface 32 of the glass plate 30 refers to the surface 32 of the glass plate 30 on the laser light source 310 side (and the nozzle 320 side) and an extended surface of the surface 32.
- the extended surface is set on the outer side and the inner side of the glass plate 30, and is also set, for example, in a gap formed by fusing between the part 40 that is a product and the part 50 that is not a product.
- the laser beam 312 may be formed in a linear shape including a linear portion and / or a curved portion.
- the laser beam 312 has a length along the moving direction (that is, a length along the planned fusing line) as L (see FIG. 8) and a width as W (see FIG. 8). ), 10 ⁇ L / W ⁇ 60 is satisfied.
- a more preferable range is 10 ⁇ L / W ⁇ 40, and a particularly preferable range is 10 ⁇ L / W ⁇ 20.
- L is preferably 4 to 20 mm, more preferably 4 to 12 mm, and still more preferably 4 to 6 mm.
- L is preferably 4 to 20 mm, more preferably 4 to 12 mm, and still more preferably 4 to 6 mm.
- L is shorter than the length of the planned fusing line on the surface 32 of the glass plate 30.
- W is preferably 0.2 to 1.0 mm, more preferably 0.2 to 0.6 mm, and still more preferably 0.2 to 0.4 mm.
- W is preferably 0.2 to 1.0 mm, more preferably 0.2 to 0.6 mm, and still more preferably 0.2 to 0.4 mm.
- W is formed by fusing between the portion 40 that becomes the product and the portion 50 that does not become the product so that the laser beam 312 can heat the melted section 42 of the portion 40 that becomes the product. It is set wider than the gap.
- the glass can be divided by the air flow 322 in a sufficiently softened state, and after the division, the softened portion is rounded by the surface tension. Can be secured sufficiently.
- a more preferable range is ⁇ 0.15 ⁇ L ⁇ X ⁇ 0.15 ⁇ L, and a particularly preferable range is ⁇ 0.1 ⁇ L ⁇ X ⁇ 0.1 ⁇ L.
- the airflow 322 on the plane including the surface 32 of the glass plate 30 refers to a projection of the outlet of the nozzle 320 onto the plane including the surface 32 of the glass plate 30 in parallel with the center line of the nozzle 320. .
- Y is a distance in a direction perpendicular to the moving path, and is positive when the center 326 of the air flow 322 is shifted to the product side of both sides of the moving path, and is shifted to the opposite side. Negative when By satisfying the equation of 0 ⁇ Y, a well-shaped molten section can be obtained. In order to enhance this effect, it is desirable to dispose the nozzle 320 above the product portion 40 and inject the airflow 322 obliquely from the nozzle 320 toward the fusing position of the glass plate 30.
- Y (see FIG. 8) is preferably 0 to 1.5 mm, more preferably 0 to 1.0 mm, and still more preferably 0 to 0.5 mm. If Y exceeds 1.5 mm, the region where the laser beam 312 and the airflow 322 overlap on the surface 32 of the glass plate 30 is too narrow, so that the fusing efficiency is deteriorated.
- the center 316 of the laser beam 312 and the center 326 of the airflow 322 are moved in conjunction so as to satisfy the above positional relationship on the plane including the surface 32 of the glass plate 30.
- the moving speed is preferably 10 to 200 mm / sec, more preferably 10 to 100 mm / sec, and still more preferably 20 to 60 mm / sec. Further, the movement trajectory may be linear or curved.
- the plate glass manufacturing method includes a fusing step of fusing the glass plate 30 by moving the irradiation position of the laser beam 312 and the blowing position of the air current 322 on the surface 32 of the flat glass plate 30.
- the center 316 of the laser beam 312 is outside the glass plate 30, and only the outer peripheral portion of the glass plate 30 is irradiated with the laser beam 312.
- the center 326 of the airflow 322 is also outside the glass plate 30, and the airflow 322 is not blown onto the glass plate 30.
- the airflow 322 since the airflow 322 is not sprayed on the glass plate 30 at the time of the start of fusing, the airflow 322 does not need to be formed.
- the timing at which the airflow 322 is formed may be slightly delayed from the timing at which the laser beam 312 is formed.
- the center 316 of the laser beam 312 and the center 326 of the airflow 322 are moved in conjunction so as to satisfy the above positional relationship, and each moves on the surface 32 of the glass plate 30.
- the plate glass manufacturing method may further include an annealing step of annealing the plate glass 40 obtained by fusing in addition to the fusing step. Thereby, the residual distortion resulting from local heating at the time of fusing can be relieved.
- Examples 1 to 8 A flat glass plate with a thickness of 0.6 mm (Asahi Glass Co., Ltd., AN100, non-alkali glass) is preheated to 500 ° C. and then placed horizontally on the moving stage, and the moving stage is mounted with a laser light source (CO 2 laser) or nozzle It was moved at 20 mm / sec. The irradiation position of the laser beam and the blowing position of the airflow on the surface of the glass plate were moved linearly in parallel with one side of the glass plate.
- CO 2 laser laser light source
- Laser power, L and W shown in FIG. 8, were as shown in Tables 1 and 2, respectively.
- “laser light power” means the power of laser light measured on a plane including the surface of the glass plate (the same applies to the following examples).
- the power of the laser light is determined by the output of the laser light source and the optical system.
- the laser beam was formed in a straight line shape (more specifically, an elliptical shape) on a plane including the surface of the glass plate.
- the flow rate of the air flow injected from the nozzle (outlet diameter: 2 mm, outlet temperature: 800 ° C.), ⁇ shown in FIG. 7, ⁇ shown in FIG. 8, X and Y shown in FIG. was set as shown.
- the results of fusing were evaluated based on whether fusing was possible, the shape of the fusing cross section, and the protrusion amount H. Whether or not fusing was possible was evaluated as ⁇ when the glass plate was separated into two and ⁇ when the glass plate was not separated. In the evaluation of the shape, the size and shape of the melted cross section of the part to be the product is observed with an optical microscope. The case where the shape is not an arcuate surface is indicated by ⁇ , the protrusion amount H is less than 0.1 mm, and the shape of the melted surface is an arcuate surface. The results are shown in Tables 1 and 2.
- Example 9 to 19 A flat glass plate with a thickness of 0.6 mm (Asahi Glass Co., Ltd., AN100, non-alkali glass) is preheated to 500 ° C. and then placed horizontally on the moving stage, and the moving stage is mounted with a laser light source (CO 2 laser) or nozzle It was moved at 20 mm / sec. The irradiation position of the laser beam and the blowing position of the airflow on the surface of the glass plate were moved linearly in parallel with one side of the glass plate.
- CO 2 laser laser light source
- Laser power, L and W shown in FIG. 8, were as shown in Tables 3 to 4, respectively.
- the laser beam was formed in a straight line shape (more specifically, an elliptical shape).
- the flow rate of the airflow injected from the nozzle (exit diameter: 2 mm, exit temperature: 800 ° C.) was 30 L / min, ⁇ shown in FIG. 7 was 35 °, and ⁇ shown in FIG. 8 was 0 °.
- X and Y shown in FIG. 8 and the like were set as shown in Tables 3 to 4, respectively.
- the glass can be divided by an air flow in a sufficiently softened state, and after being cut, the glass is softened. It was possible to secure a sufficient time until the cut portion was rounded by the surface tension.
- Example 20 to Example 23 A flat glass plate with a thickness of 0.6 mm (Asahi Glass Co., Ltd., AN100, non-alkali glass) is preheated to 500 ° C. and then placed horizontally on the moving stage, and the moving stage is mounted with a laser light source (CO 2 laser) or nozzle It was moved at 20 mm / sec. The irradiation position of the laser beam and the blowing position of the airflow on the surface of the glass plate were moved linearly in parallel with one side of the glass plate.
- CO 2 laser laser
- Laser power, L and W shown in FIG. 8, were as shown in Table 5, respectively.
- the laser beam was formed linearly (more specifically, elliptical).
- the flow rate of the airflow injected from the nozzle (exit diameter: 2 mm, exit temperature: 800 ° C.) was 30 L / min, ⁇ shown in FIG. 7 was 35 °, and ⁇ shown in FIG. 8 was 0 °.
- X and Y shown in FIG. 8 and the like were set as shown in Table 5, respectively.
- Table 5 shows the results of fusing.
- Examples 24 to 27 A flat glass plate having a thickness of 0.6 mm (Asahi Glass Co., Ltd., AN100, non-alkali glass) is preheated to the preheating temperature shown in Table 6 and then placed horizontally on the moving stage, and the moving stage is mounted with a laser light source (CO 2 Laser) and the nozzle at 20 mm / sec. The irradiation position of the laser beam and the blowing position of the airflow on the surface of the glass plate were moved linearly in parallel with one side of the glass plate.
- CO 2 Laser laser light source
- the power of the laser beam was as shown in Table 6.
- L shown in FIG. 8 was 4 mm, and W shown in FIG. 8 was 0.4 mm.
- the laser beam was formed linearly (more specifically, elliptical).
- the flow rate of the airflow injected from the nozzle (exit diameter: 2 mm, exit temperature: 800 ° C.) was 15 L / min, ⁇ shown in FIG. 7 was 35 °, and ⁇ shown in FIG. 8 was 0 °.
- X shown in FIG. 8 and the like was ⁇ 0.2 mm, and Y shown in FIG. 8 and the like was 0.5 mm.
- Table 6 shows the results of fusing.
- Example 28 to Example 31 A flat glass plate with a thickness of 0.6 mm (Asahi Glass Co., Ltd., AN100, non-alkali glass) is preheated to 560 ° C. and then placed horizontally on the moving stage, and the moving stage is mounted with a laser light source (CO 2 laser) or nozzle It was moved at 20 mm / sec. The irradiation position of the laser beam and the blowing position of the airflow on the surface of the glass plate were moved linearly in parallel with one side of the glass plate.
- CO 2 laser laser light source
- the power of the laser beam was as shown in Table 7.
- L shown in FIG. 8 was 4 mm, and W shown in FIG. 8 was 0.4 mm.
- the laser beam was formed linearly (more specifically, elliptical).
- the flow rate of the air flow injected from the nozzle (exit diameter: 2 mm) is 15 L / min, ⁇ shown in FIG. 7 is 35 °, ⁇ shown in FIG. 8 is 0 °, X shown in FIG. Y shown in FIG. 8 was set to 0.5 mm.
- the nozzle outlet temperature was set as shown in Table 7.
- Table 7 shows the results of fusing.
- Examples 32 to 34 A flat glass plate (Asahi Glass Co., Ltd., AN100, non-alkali glass) having the thickness shown in Table 8 is preheated at the preheating temperature shown in Table 8, and then placed horizontally on the moving stage, and the moving stage is mounted with a laser light source ( CO 2 laser) and the nozzle were moved at 60 mm / sec. The irradiation position of the laser beam and the blowing position of the airflow on the surface of the glass plate were moved linearly in parallel with one side of the glass plate.
- a laser light source CO 2 laser
- the power of the laser beam was as shown in Table 8.
- L shown in FIG. 8 was 4 mm, and W shown in FIG. 8 was 0.4 mm.
- the laser beam was formed linearly (more specifically, elliptical).
- the flow rate of the airflow ejected from the nozzle (exit diameter: 2 mm, exit temperature: 800 ° C.), X and Y shown in FIG. 8 and the like were set as shown in Table 8, respectively.
- ⁇ shown in FIG. 7 was 35 °
- ⁇ shown in FIG. 8 was 90 °.
- Table 8 shows the results of fusing.
- Example 35 to Example 36 A flat glass plate (AS, soda lime glass, manufactured by Asahi Glass Co., Ltd.) having the thickness shown in Table 9 is preheated to 460 ° C. and then placed horizontally on the moving stage, and the moving stage is a laser light source (CO 2 laser) And 20 mm / sec with respect to the nozzle. The irradiation position of the laser beam and the blowing position of the airflow on the surface of the glass plate were moved linearly in parallel with one side of the glass plate.
- AS soda lime glass, manufactured by Asahi Glass Co., Ltd.
- the laser beam power was 4 mm for L shown in FIG. 8 and 0.4 mm for W shown in FIG.
- the laser beam was formed linearly (more specifically, elliptical).
- the flow rate of the air flow injected from the nozzle (exit diameter: 2 mm, outlet temperature: 800 ° C., ⁇ : 35 °, ⁇ : 0 °), X and Y shown in FIG. 8 and the like are set as shown in Table 9 respectively. did.
- Table 9 shows the results of fusing.
- Example 37 to Example 42 A flat glass plate with a thickness of 0.6 mm (Asahi Glass Co., Ltd., AN100, non-alkali glass) is preheated to 500 ° C. and then placed horizontally on the moving stage, and the moving stage is mounted with a laser light source (CO 2 laser) or nozzle It was moved at 20 mm / sec. The irradiation position of the laser beam and the blowing position of the airflow on the surface of the glass plate were moved linearly in parallel with one side of the glass plate.
- CO 2 laser laser
- the laser beam power was 126 W, L shown in FIG. 8 was 4 mm, and W shown in FIG. 8 was 0.4 mm. On the plane including the surface of the glass plate, the laser beam was formed linearly (more specifically, elliptical).
- the flow rate of the air flow injected from the nozzle (exit temperature: 800 ° C., ⁇ : 35 °, ⁇ : 0 °), the nozzle outlet diameter, and X and Y shown in FIG. 8 are set as shown in Table 10, respectively. did.
- Table 10 shows the results of fusing.
- Example 43 A 0.6 mm thick flat glass plate (Asahi Glass Co., Ltd., AN100, non-alkali glass) is preheated to 560 ° C. and then placed on the moving stage, and the moving stage is placed against the laser light source (CO 2 laser) and nozzle. And moved at 60 mm / sec. The irradiation position of the laser beam and the blowing position of the airflow on the surface of the glass plate were moved linearly in parallel with one side of the glass plate.
- the laser light source CO 2 laser
- Laser power was 504 W, L shown in FIG. 8 was 4 mm, and W shown in FIG. 8 was 0.4 mm.
- the laser beam was formed linearly (more specifically, elliptical).
- the flow rate of the airflow injected from the nozzle (exit diameter: 2 mm, outlet temperature: 800 ° C., ⁇ : 35 °, ⁇ : 90 °) is 20 L / min, X shown in FIG. 8 is 0 mm, and is also shown in FIG. Y was 0.5 mm.
- this plate glass was annealed under the following conditions.
- Starting temperature room temperature heating rate: 5 ° C./min Maximum temperature: 710 ° C (30 minutes)
- the plane strain of the plate glass was measured again. As a result, the plane strain in the vicinity of the molten section was 0 MPa.
- Example 44 The part (plate glass) to be the product obtained in Example 4 was annealed under the same conditions as in Example 43, and then an impact strength test was performed using a pendulum Charpy impact tester.
- the test piece was prepared by cutting the annealed glass plate.
- the dimension of the test piece was 60 mm ⁇ 30 mm ⁇ 0.6 mm, and the length of the molten section was 60 mm.
- FIG. 10 is an explanatory diagram of an impact strength tester.
- a state where the impactor 503 is in the neutral position is indicated by a solid line
- a state where the impactor 503 is lifted from the neutral position is indicated by a one-dot chain line.
- the impact tester 500 includes a horizontally disposed rotating shaft 501, a rod 502 extending vertically from the rotating shaft 501, and a columnar impactor 503 coaxially fixed to the rod 502.
- the impactor 503 has a diameter of 19 mm, a height of 30 mm, and a weight of 67 g, and is made of SS.
- the impactor 503 is rotatable about a rotation shaft 501 and can be rotated right and left from a neutral position where the rod 502 is vertical.
- the impact tester 500 includes a jig 504 that supports the main surface 601 of the test piece 600 with an inclination of 45 ° with respect to the horizontal plane.
- the molten surface 602 that is one side surface of the test piece 600 is arranged in parallel with the rotation shaft 501.
- the impactor 503 In the impact testing machine 500, the impactor 503 is lifted from the neutral position and then dropped by gravity. The impactor 503 rotates around the rotation shaft 501 and collides with the melted surface 602 which is one side surface of the test piece 600 at the neutral position. The impact energy applied to the test piece 600 at the time of collision is calculated based on the weight of the impactor 503 and the height H at which the center of gravity 505 of the impactor 503 is lifted.
- impact strength S (J) The maximum impact energy when no crack is generated is recorded as impact strength S (J). Since the impact strength S (J) tends to increase as the plate thickness t (mm) of the test piece 600 increases, the ratio S / t between the impact strength S and the plate thickness t determines the impact resistance of the glass plate. It becomes an index to represent.
- Example 44 the impact strength S was 0.05 J, and the ratio S / t between the impact strength S and the plate thickness t was 0.083 J / mm.
- Example 45 The glass plate obtained in Example 26 was annealed under the same conditions as in Example 43, and then an impact strength test was performed in the same manner as in Example 44. As a result, the impact strength S was 0.08 J, and the ratio S / t between the impact strength S and the sheet thickness t was 0.133 J / mm.
- Example 46 The glass plate obtained in Example 27 was annealed under the same conditions as in Example 43, and then an impact strength test was conducted in the same manner as in Example 44. As a result, the impact strength S was 0.05 J, and the ratio S / t between the impact strength S and the plate thickness t was 0.133 J / mm.
- the cleaved surface of the test piece obtained by cleaving was chamfered into a circular arc shape with a grindstone, and then an impactor was collided with the chamfered surface to conduct an impact strength test.
- the impact strength S was 0.03 J
- the ratio S / t between the impact strength S and the sheet thickness t was 0.0043 J / mm.
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Abstract
Description
レーザ光の照射によって形成される溶断面を側面に有する板ガラスであって、
前記板ガラスの溶断面は、少なくとも、前記板ガラスの一方の主面と交わる隅部、および前記板ガラス10の他方の主面と交わる隅部に、丸みを帯びた形状を有しており、各隅部の任意の位置における曲率半径をrとし、前記板ガラスの中央部の板厚をtとすると、1/3×t≦r≦2/3×tの式を満たす板ガラスを提供する。
平板状のガラス板の表面上における、レーザ光の照射位置および気流の吹き付け位置を移動させて、前記ガラス板を溶断する溶断工程を有する板ガラスの製造方法において、
前記溶断工程は、前記ガラス板を2つに溶断すると共に、一方または両方の溶断面の少なくとも両隅部を、それぞれ、丸みを帯びた形状に形成する工程であって、
前記ガラス板の表面を含む平面上において、前記レーザ光は、移動方向に沿って線状に形成されており、前記移動方向に沿う長さをLとし、幅をWとすると、10≦L/W≦60の式を満たす板ガラスの製造方法を提供する。
平板状のガラス板を支持する支持体と、レーザ光を出射するレーザ光源と、気流を噴射するノズルと、前記支持体によって支持されるガラス板の表面上における、前記レーザ光源から出射されたレーザ光の照射位置、および、前記ノズルから噴射された気流の吹き付け位置を移動させる移動装置と、該移動装置を制御する制御装置とを有する前記ガラス板の溶断装置を有する板ガラスの製造装置において、
前記溶断装置は、前記ガラス板を2つに溶断すると共に、一方または両方の溶断面の少なくとも両隅部を、それぞれ、丸みを帯びた形状に形成する装置であって、
前記ガラス板の表面を含む平面上において、前記レーザ光は、移動方向に沿って線状に形成されており、前記移動方向に沿う長さをLとし、幅をWとすると、10≦L/W≦60の式を満たす板ガラスの製造装置を提供する。
図1は、本発明の一実施形態による板ガラスを、溶断面の延びる方向から見たときの図である。図1に示すように、板ガラス10は、レーザ光の照射によって形成される溶断面12を側面に有している。尚、板ガラス10の側面が溶断面か否かは、位相差顕微鏡や電子顕微鏡を用いて判断できる。
CaO:0~14.5%、SrO:0~24%、BaO:0~13.5%、MgO+CaO+SrO+BaO:16~29.5%、を含有する無アルカリガラスが挙げられる。MgO、CaO、SrO、BaOは任意成分である。これらのガラスの化学組成は、蛍光X線分析装置により測定することができる。
図5は、本発明の一実施形態による板ガラスの製造装置を一部破断して示す側面図である。図5に示すように、板ガラスの製造装置100は、熱処理装置200、溶断装置300、アニール装置400を有する。
図6は、本発明の一実施形態による溶断装置の要部を拡大して示す側面図である。図7は、本発明の一実施形態による溶断装置の要部を拡大して示す正面図である。図8は、本発明の一実施形態による溶断装置の要部を拡大して示す平面図であって、ガラス板の表面を含む平面上におけるレーザ光および気流の位置関係を示す平面図である。
次に、上記構成の製造装置100を用いて、板ガラスを製造する方法について説明する。
板ガラスの製造方法は、平板状のガラス板30の表面32上における、レーザ光312の照射位置、および気流322の吹き付け位置を移動させて、ガラス板30を溶断する溶断工程を有する。
厚さ0.6mmの平板状のガラス板(旭硝子社製、AN100、無アルカリガラス)を500℃に予熱したうえで、移動ステージに水平に載せ、移動ステージをレーザ光源(CO2レーザ)やノズルに対して20mm/secで移動させた。ガラス板の表面上における、レーザ光の照射位置や気流の吹き付け位置は、ガラス板の一辺と平行に直線状に移動させた。
厚さ0.6mmの平板状のガラス板(旭硝子社製、AN100、無アルカリガラス)を500℃に予熱したうえで、移動ステージに水平に載せ、移動ステージをレーザ光源(CO2レーザ)やノズルに対して20mm/secで移動させた。ガラス板の表面上における、レーザ光の照射位置や気流の吹き付け位置は、ガラス板の一辺と平行に直線状に移動させた。
厚さ0.6mmの平板状のガラス板(旭硝子社製、AN100、無アルカリガラス)を500℃に予熱したうえで、移動ステージに水平に載せ、移動ステージをレーザ光源(CO2レーザ)やノズルに対して20mm/secで移動させた。ガラス板の表面上における、レーザ光の照射位置や気流の吹き付け位置は、ガラス板の一辺と平行に直線状に移動させた。
厚さ0.6mmの平板状のガラス板(旭硝子社製、AN100、無アルカリガラス)を表6に示す予熱温度に予熱したうえで、移動ステージに水平に載せ、移動ステージをレーザ光源(CO2レーザ)やノズルに対して20mm/secで移動させた。ガラス板の表面上における、レーザ光の照射位置や気流の吹き付け位置は、ガラス板の一辺と平行に直線状に移動させた。
厚さ0.6mmの平板状のガラス板(旭硝子社製、AN100、無アルカリガラス)を560℃に予熱したうえで、移動ステージに水平に載せ、移動ステージをレーザ光源(CO2レーザ)やノズルに対して20mm/secで移動させた。ガラス板の表面上における、レーザ光の照射位置や気流の吹き付け位置は、ガラス板の一辺と平行に直線状に移動させた。
表8に示す厚さを有する平板状のガラス板(旭硝子社製、AN100、無アルカリガラス)を表8に示す予熱温度で予熱したうえで、移動ステージに水平に載せ、移動ステージをレーザ光源(CO2レーザ)やノズルに対して60mm/secで移動させた。ガラス板の表面上における、レーザ光の照射位置や気流の吹き付け位置は、ガラス板の一辺と平行に直線状に移動させた。
表9に示す厚さを有する平板状のガラス板(旭硝子社製、AS、ソーダライムガラス)を460℃に予熱したうえで、移動ステージに水平に載せ、移動ステージをレーザ光源(CO2レーザ)やノズルに対して20mm/secで移動させた。ガラス板の表面上における、レーザ光の照射位置や気流の吹き付け位置は、ガラス板の一辺と平行に直線状に移動させた。
厚さ0.6mmの平板状のガラス板(旭硝子社製、AN100、無アルカリガラス)を500℃に予熱したうえで、移動ステージに水平に載せ、移動ステージをレーザ光源(CO2レーザ)やノズルに対して20mm/secで移動させた。ガラス板の表面上における、レーザ光の照射位置や気流の吹き付け位置は、ガラス板の一辺と平行に直線状に移動させた。
厚さ0.6mmの平板状のガラス板(旭硝子社製、AN100、無アルカリガラス)を560℃に予熱したうえで、移動ステージに載せ、移動ステージをレーザ光源(CO2レーザ)やノズルに対して60mm/secで移動させた。ガラス板の表面上における、レーザ光の照射位置や気流の吹き付け位置は、ガラス板の一辺と平行に直線状に移動させた。
開始温度:室温
昇温速度:5℃/min
最高温度:710℃(30分)
降温速度:-1℃/min
アニール処理後、板ガラスの平面歪みを再度測定した。その結果、溶断面の近傍における平面歪みは、0MPaであった。
例4で得られた製品となる部分(板ガラス)を、例43と同じ条件でアニール処理した後、振り子式のシャルピー衝撃試験機を用いて、衝撃強度試験を行った。試験片は、アニール処理後のガラス板を切断して作製した。試験片の寸法は、60mm×30mm×0.6mmであって、溶断面の長さは60mmとした。
例26で得られたガラス板を、例43と同じ条件でアニール処理した後、例44と同様にして衝撃強度試験を行った。その結果、衝撃強度Sは0.08Jであり、衝撃強度Sと板厚tとの比S/tは0.133J/mmであった。
例27で得られたガラス板を、例43と同じ条件でアニール処理した後、例44と同様にして衝撃強度試験を行った。その結果、衝撃強度Sは0.05Jであり、衝撃強度Sと板厚tとの比S/tは0.133J/mmであった。
12 溶断面
16 隅部
18 隅部
30 ガラス板
40 製品となる部分
41 溶断面
47 隅部
48 隅部
50 製品とならない部分
100 板ガラスの製造装置
200 熱処理装置
300 溶断装置
310 レーザ光源
312 レーザ光
316 ガラス板の表面を含む平面上におけるレーザ光の中心
320 ノズル
322 気流
326 ガラス板の表面を含む平面上における気流の中心
330 搬送ロール(支持体)
340 移動装置
350 制御装置
400 アニール装置
Claims (16)
- レーザ光の照射によって形成される溶断面を側面に有する板ガラスであって、
前記板ガラスの溶断面は、少なくとも、前記板ガラスの一方の主面と交わる隅部、および前記板ガラスの他方の主面と交わる隅部に、丸みを帯びた形状を有しており、各隅部の任意の位置における曲率半径をrとし、前記板ガラスの中央部の板厚をtとすると、1/3×t≦r≦2/3×tの式を満たす板ガラス。 - 前記板ガラスの溶断面は、円弧面である請求項1に記載の板ガラス。
- 前記板ガラスの溶断面は、前記板ガラスの中央部に対し、板厚方向における突出量が0.1mm未満となるように形成されている請求項1または2に記載の板ガラス。
- 前記板ガラスの中央部の板厚が0.05~1.0mmである請求項1~3のいずれか1項に記載の板ガラス。
- 前記板ガラスの用途は、画像を表示する表示ディスプレイ用である請求項1~4のいずれか1項に記載の板ガラス。
- 前記板ガラスは、酸化物基準の質量百分率表示で、
SiO2:50~66%
Al2O3:10.5~24%
B2O3:0~12%
MgO:0~8%
CaO:0~14.5%
SrO:0~24%
BaO:0~13.5%
MgO+CaO+SrO+BaO:9~29.5%
ZrO2:0~5%
を含有する無アルカリガラスで構成される請求項5に記載の板ガラス。 - 前記板ガラスの溶断部は、前記板ガラスの中央部と異なる屈折率を有する請求項1~6のいずれか1項に記載の板ガラス。
- 前記板ガラスの衝撃強度をS(J)とし、前記板ガラスの中央部の板厚をt(mm)とすると、S/tが0.043J/mmよりも大きい請求項1~7のいずれか1項に記載の板ガラス。
- 平板状のガラス板の表面上における、レーザ光の照射位置および気流の吹き付け位置を移動させて、前記ガラス板を溶断する溶断工程を有する板ガラスの製造方法において、
前記溶断工程は、前記ガラス板を2つに溶断すると共に、一方または両方の溶断面の少なくとも両隅部を、それぞれ、丸みを帯びた形状に形成する工程であって、
前記ガラス板の表面を含む平面上において、前記レーザ光は、移動方向に沿って線状に形成されており、前記移動方向に沿う長さをLとし、幅をWとすると、10≦L/W≦60の式を満たす板ガラスの製造方法。 - 前記ガラス板の表面を含む平面上において、前記気流の中心は、前記レーザ光の中心との間の移動方向における距離をXとし、該Xは前記気流の中心が前記レーザ光の中心よりも移動方向前方にあるときに正とし、移動方向後方にあるときに負とすると、-0.25×L<X<0.2×Lの式を満たす請求項9に記載の板ガラスの製造方法。
- 前記溶断工程は、前記ガラス板を、製品となる部分と、製品とならない部分とに溶断する工程であって、
前記ガラス板の表面を含む平面上において、前記気流の中心は、前記レーザ光の中心の移動経路との間の距離をYとし、該Yは、前記気流の中心が前記移動経路を挟んだ両側のうち、製品側にずれているときに正とし、反対側にずれているときに負とすると、0≦Yの式を満たす請求項9または10に記載の板ガラスの製造方法。 - 溶断により得られる板ガラスをアニール処理するアニール工程をさらに有する請求項9~11のいずれか1項に記載の板ガラスの製造方法。
- 平板状のガラス板を支持する支持体と、レーザ光を出射するレーザ光源と、気流を噴射するノズルと、前記支持体によって支持されるガラス板の表面上における、前記レーザ光源から出射されたレーザ光の照射位置、および、前記ノズルから噴射された気流の吹き付け位置を移動させる移動装置と、該移動装置を制御する制御装置とを有する前記ガラス板の溶断装置を有する板ガラスの製造装置において、
前記溶断装置は、前記ガラス板を2つに溶断すると共に、一方または両方の溶断面の少なくとも両隅部を、それぞれ、丸みを帯びた形状に形成する装置であって、
前記ガラス板の表面を含む平面上において、前記レーザ光は、移動方向に沿って線状に形成されており、前記移動方向に沿う長さをLとし、幅をWとすると、10≦L/W≦60の式を満たす板ガラスの製造装置。 - 前記ガラス板の表面を含む平面上において、前記気流の中心は、前記レーザ光の中心との間の移動方向における距離をXとし、該Xは前記気流の中心が前記レーザ光の中心よりも移動方向前方にあるときに正とし、移動方向後方にあるときに負とすると、-0.25×L<X<0.2×Lの式を満たす請求項13に記載の板ガラスの製造装置。
- 前記溶断装置は、前記ガラス板を、製品となる部分と、製品とならない部分とに溶断する装置であって、
前記ガラス板の表面を含む平面上において、前記気流の中心は、前記レーザ光の中心の移動経路との間の距離をYとし、該Yは、前記気流の中心が前記移動経路を挟んだ両側のうち、製品側にずれているときに正とし、反対側にずれているときに負とすると、0≦Yの式を満たす請求項13または14に記載の板ガラスの製造装置。 - 溶断により得られる板ガラスをアニール処理するアニール装置をさらに有する請求項13~15のいずれか1項に記載の板ガラスの製造装置。
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WO2014077067A1 (ja) * | 2012-11-13 | 2014-05-22 | 日本電気硝子株式会社 | 板ガラス |
JP2015089856A (ja) * | 2013-11-05 | 2015-05-11 | 日本電気硝子株式会社 | 板ガラスの切断方法 |
JPWO2014171375A1 (ja) * | 2013-04-18 | 2017-02-23 | 旭硝子株式会社 | ガラス板の製造方法及びガラス板の製造装置並びにガラス板 |
WO2019181802A1 (ja) * | 2018-03-20 | 2019-09-26 | 三菱電機株式会社 | 画像表示装置および画像表示装置の製造方法 |
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CN104591531A (zh) * | 2015-01-20 | 2015-05-06 | 信利半导体有限公司 | 一种切割工艺 |
TWI609754B (zh) * | 2015-09-29 | 2018-01-01 | 三星鑽石工業股份有限公司 | 脆性基板之分斷方法 |
TWI678342B (zh) | 2018-11-09 | 2019-12-01 | 財團法人工業技術研究院 | 形成導角的切割方法 |
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