WO2006064674A1 - 板ガラスの製法 - Google Patents
板ガラスの製法 Download PDFInfo
- Publication number
- WO2006064674A1 WO2006064674A1 PCT/JP2005/022167 JP2005022167W WO2006064674A1 WO 2006064674 A1 WO2006064674 A1 WO 2006064674A1 JP 2005022167 W JP2005022167 W JP 2005022167W WO 2006064674 A1 WO2006064674 A1 WO 2006064674A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- glass
- gas
- support member
- sheet
- deformation
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B17/00—Forming molten glass by flowing-out, pushing-out, extruding or drawing downwardly or laterally from forming slits or by overflowing over lips
- C03B17/06—Forming glass sheets
-
- 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
- C03B35/22—Transporting hot glass sheets or ribbons, e.g. by heat-resistant conveyor belts or bands on a fluid support bed, e.g. on molten metal
- C03B35/24—Transporting hot glass sheets or ribbons, e.g. by heat-resistant conveyor belts or bands on a fluid support bed, e.g. on molten metal on a gas support bed
- C03B35/246—Transporting continuous glass ribbons
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B17/00—Forming molten glass by flowing-out, pushing-out, extruding or drawing downwardly or laterally from forming slits or by overflowing over lips
- C03B17/06—Forming glass sheets
- C03B17/061—Forming glass sheets by lateral drawing or extrusion
- C03B17/062—Forming glass sheets by lateral drawing or extrusion combined with flowing onto a solid or gaseous support from which the sheet is drawn
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
Definitions
- the present invention relates to a method for producing a high quality sheet glass having a nano level surface smoothness with few surface defects and impurities.
- Sheet glass for construction and vehicles is produced by the tin float method, in which almost all molten glass flows out on a tin bath and is gradually formed into a flat plate shape in developed countries.
- platinum on both sides of the platinum crucible is made to flow over the molten glass to make platinum After flowing down along the guides, the glass from both sides is put together into a single sheet, often using the so-called fusion method.
- a netted glass it is manufactured by laminating and forming while applying pressure with a metal roll to sandwich a net such as stainless steel between.
- the glass having a large heat flux between the glass and the metal tin because the high temperature glass has high thermal conductivity, and is in direct contact with the metal tin is tin.
- Temperature control is a very important technical issue as it is directly affected by temperature.
- the molten glass is made to overflow on both sides of a special repulsive force, and this is allowed to flow down along both sides of the platinum guide, and joined at the lower end of the guide to form a sheet of glass ribbon.
- a so-called fusion method in which down-draw molding is performed after that.
- the surface of the sheet glass product is only exposed to air during the manufacturing process, so there is no concern about surface defects as described above, and it is highly regarded as a high-end product especially for display applications. There is.
- the glass at the tip of the platinum guide is subjected to maximum load, and temperature control of the glass is used to reduce it. It becomes complicated and not suitable for the production of thick products.
- the quality of the product which is hard to avoid leaving traces of contact with the metal rolls in the form of wrinkles or irregularities, is not as durable as flat glass sheet applications.
- the maximum temperature range at which the glass is molded is between 1300 ° C. and 700 ° C. per minute. It is preferable to cool at a speed of at least 00 ° C., preferably at least 200 ° C., and apply tension parallel to the glass surface to form the required thickness during this process, in order to achieve uniform forming. And have been proposed (see Patent Document 2).
- the above proposal is limited to partial improvement as a pre-process of the tin bath method, and can not be expected as a drastic solution including defects and problems of the fusion method and the water vapor thin film method.
- Patent Document 1 Japanese Patent Application Laid-Open No. 9 295819
- Patent Document 2 Japanese Patent Application Laid-Open No. 2002-47017
- Patent Document 3 Japanese Patent Application Laid-Open No. 2001-247320
- Patent Document 4 Japanese Patent Application Laid-Open No. 7-33456
- Patent Document 5 Japanese Patent Application Laid-Open No. 2003-146675
- Patent Document 6 Japanese Patent Application Laid-Open No. 6-345467
- Patent Document 7 Japanese Patent Application Laid-Open No. 2003-300739
- the present invention solves or improves the drawbacks, limitations, and the like of the conventionally known techniques such as the above-described tin bath method and down draw method represented by the fusion method and metal rolling method, and is simple and energy-efficient.
- Providing a technology that can significantly reduce environmental problems and provide high quality plate-like glass without surface defects, and fundamentally fundamentally missing important technical aspects in the method of using a vapor film And elements are clarified, and a new technology for manufacturing high-quality flat glass excellent in macro thickness uniformity and flatness, etc. together with smoothness on the order of nanometers, is provided through the forming method of flat glass using a wider range of gases. It is an issue to do.
- the present inventors have conducted various studies based on the recognition of the above problems and problems, and as a result, a high quality plate glass having a level sufficient for practical use in terms of macro flatness and thickness uniformity over the entire product.
- the gas generated from the supporting member and in particular, both sides of the high temperature glass having a viscosity suitable for forming are placed in the gaseous environment. While supporting the glass with gas on one side and controlling the action of gravity acting on the glass, partial displacement and deformation of the glass are repeatedly given changing its position, and it is propagated and spread throughout the glass We found that it was important.
- the term “displacement” as used herein means that the glass changes position as it is lifted, lowered or moved.
- This dynamic gravity control provides partial displacement and deformation of the glass due to the gravity over the entire surface of the high temperature glass to be subjected to molding, and controls the size and location of the gravity by changing over time. It is a thing. In other words, changing the magnitude of gravity locally exerted on the glass to be formed momentarily under a certain order, in other words, dynamically controlling the gravity applied to the glass, locally and temporally It is through the discovery that it is important to apply varying displacements and deformations.
- This dynamic gravity control makes it possible to bring about a uniform expansion (stretching) over the entire glass provided during molding, and can realize an improvement in thickness uniformity and flatness.
- Dynamic gravity control is important especially when trying to form a wide sheet glass, when the glass is at a sufficiently high temperature and its viscosity as a viscous fluid is close to that of a so-called Uton fluid.
- the viscosity and rigidity of the glass to be provided are sufficiently high. It is necessary and important for achieving a high degree of uniformity and smoothness' flatness by continuously applying tensile stress to the glass and stretching and forming it to a temperature region where the lath does not deform.
- continuous means that there is no obvious time or place, or disconnection. For example, even if partial tensile stress is applied to a glass by a pin embedded in a jig at a fixed interval of about 5 mm, it can be regarded as continuous as long as it is always performed in this manufacturing process. It is a forgiveness.
- dynamic gravity control member a plurality of members generating a plurality of gases spaced apart on a supporting plate for supporting glass
- the dimensions, shape, installation position, etc. of the dynamic gravity control member are designed so that optimal displacement and deformation due to gravity occur locally in the glass according to the type, shape, application, etc. of the material of the glass to be manufactured. It is necessary to Therefore, it should be understood that this can be suitably modified as shown in the drawings to be described later, and not in a fixed size and shape.
- this dynamic gravity control member can be installed at a right angle or at a constant angle with respect to the direction of movement of the glass. It becomes possible to give displacement and deformation. Furthermore, it is also effective to variably adjust the height of the support plate force of the dynamic gravity control member. This makes it possible to arbitrarily adjust the magnitude, displacement and deformation of gravity acting on the glass.
- the height of the dynamic gravity control member generally has a certain height of 1 mm or more and 50 mm or less with respect to the reference surface of the support plate.
- the preferred range is various factors such as the thickness of the glass and the angle of the support member to the horizontal plane * The force that can be optimized by the conditions If the height is less than this range, the effect of gravity is expected 1, conversely If it exceeds the range
- the influence of gravity may act excessively, which may disturb gas generation near the top of the projection.
- Dynamic gravity control member can be used for independent movement without joining with the support plate or type of glass to be used for forming by joining or interlocking with the support plate. It can be selected as appropriate according to the product shape, molding conditions and the like, which is desirable. As described above, it is also effective to have a structure in which the height of the dynamic gravity control member from the support plate is variably adjusted.
- the support member can itself be stationary or move in the same direction at a different speed than the glass or move in a different direction with respect to the moving glass.
- the viscosity of the glass suitable for normal forming is less than 10 7 boise, and the deformable stiffness of the glass is about 50 GPA or less. It is also very effective to apply tensile stress continuously in the direction of movement of the glass and in the direction perpendicular to it in the temperature range which is at the level of rigidity, in order to improve the flatness and thickness uniformity. It is.
- These jigs are suitably used upstream and downstream of the flow of the glass ribbon to Desirable to be placed according to the rigidity.
- the glass when applying tensile stress in the direction orthogonal to the flow of the glass ribbon, the glass is always moved in the downstream direction, so the size, shape, and stress of the jig in consideration of such factors are considered.
- a design that measures optimization such as the direction of application is also desired.
- the present invention also covers the step of causing molten glass to flow down onto a support member inclined downward in the flow direction of the glass.
- Support plate force at least the lower surface of continuously moving low viscosity glass support plate with force generating gas, spaced apart to generate gas constant dimensions
- a gauze also serving as a gas generating substrate at both ends in the width direction of the lip, to hold the glass ribbon within a certain width or to guide the flow of glass in a certain direction.
- the shape of the molten glass supply port to the previous process may be circular, oval, rectangular, etc.
- the cross section may be any shape such as a circle or oval. But it is also applicable in the form that overflows from the top or the side.
- forming of glass requires that the glass to be formed be placed in a gaseous environment, and the gas used is substantially lost to the glass under the forming conditions. There is no damage or negative effects! /, although it can be used if it is a gas, air or water vapor is usually recommended in terms of availability and safety of operation and operation.
- the water When water is used as a raw material for water vapor generation, the water is evaporated from the surface of the support plate or the dynamic gravity control member by the heat of the high-temperature glass, so trace inorganic substances and inorganic ions contained in the water are accumulated near the surface. 'It is desirable for the purity of the water to be high to avoid or reduce the deposition, and in particular the content of the above mentioned inorganic substances and inorganic ions to be as low as possible.
- displacement gas also has a continuous porous structure or fiber structure, etc., and has a necessary and sufficient micro void inside, and the dimensional change such as swelling by passing or occluding gas or liquid that generates gas. It is difficult to bring in, and it is desirable to use the material as its generating support member. Force point of view Metals, ceramics, carbon, heat-resistant resin etc. are suitably used. Furthermore, the pressure of the gas supporting the glass is excessive. The presence of grooves and holes that facilitate them is important and essential, and it is important to provide supporting grooves and holes with appropriate size and distribution in the support plate and dynamic gravity control member.
- the glass ribbon supported by a gas may be horizontal or vertical, as long as the horizontal force has a constant angle, It does not matter if it is in a sloping state. Also, the movement of the support member that generates gas does not force in the same direction as the glass ribbon nor in the opposite direction. In addition, the support member does not move when it is formed in a state in which the glass ribbon moves at a sufficient speed, and it may be a fixed floor. In short, there is no problem if there is a relatively sufficient difference with the moving speed of the glass ribbon.
- the consistent processing of the pre-forming process force can eliminate defects due to the pre-process and non-uniform flow of glass or non-uniform flow of glass near the wall surface. It is possible to manufacture quality sheet glass with high productivity.
- FIG. 1 is a formed cross-sectional view of a sheet glass using a gas support member by dynamic gravity control.
- FIG. 2 It is a front view front view using a gas supporting member by dynamic gravity control.
- FIG. 3 is a partial plan view using a gas support member with dynamic gravity control.
- FIG. 4 is a partial view of a forming crucible using a gas support member with dynamic gravity control.
- soda lime silicate glass formed of yarn and used for ordinary building applications and the like.
- Silica 70 wt%), Sani ⁇ aluminum (2 wt%), sodium Sani ⁇ (13 wt%), Sani ⁇ calcium (10 weight 0/0), magnesium oxide (4 wt 0/0) and other
- iron such as acid iron Soda-lime-silicate glass, which also has a component power, is melted at sufficient temperature and time so that bubbles and compositional non-uniformity become practically unproblematic, and is formed into a sheet glass as shown in FIG.
- the glass 2 melted in the melting furnace 1 is supplied to the lip 6 as the glass melt 5 at a constant flow rate controlled by the twill 4 at a constant temperature in the temperature range of 1100 to 1300 ° C. from the discharge port 3 .
- the lip 6 is composed of a gas component supply unit 7, a support plate 8 made of a porous base material from which a gas component is supplied, and a plurality of dynamic gravity control members 9.
- the glass melt 5 is expanded and thinned in the width direction by the dynamic gravity member 9 to form a flat glass ribbon of uniform thickness.
- the lip has an inclination of about 15 ° to 30 ° downward in the flow direction of the glass, and is set in accordance with the temperature, the flow rate of the glass, and the like.
- the shape, size, installation position, etc. of the dynamic gravity control member are designed and mounted in conjunction with these factors.
- the molten glass base supplied to the lip floats on the gas that also generates lip power, so it flows down without adhering to the lip surface at all, and a glass ribbon supplied to the forming zone from the lower end of the lip.
- the temperature and thickness of 10 are substantially uniform except for a few parts at both ends.
- the glass ribbon 10 is moved onto the gas generating support member 11 of the forming zone at a constant temperature in the temperature range of 1000 to 100 ° C. and is formed into a smooth, flat glass sheet.
- the gas generation support member 11 is composed of a gas component supply unit 12, a gas generation support plate 13 supplied with gas components therefrom, and a plurality of dynamic gravity control members 14.
- the glass ribbon 10 is expanded in a uniform width direction by the action of the dynamic gravity member 14 as in the lip. At the same time, the glass ribbon is tensioned in the flow direction of the glass ribbon and in the direction perpendicular thereto by the pinch roll 19 and tensile stress application jig 15 downstream, and as the thinning progresses and the glass is cooled, the glass is flat. It is molded to plate 16.
- FIGS. 2, 3 and 4 are enlarged views of members and devices used in the above steps.
- Fig. 2 is a frontal view of the flow of the glass melt in the lip and the resulting widening of the surface. Force is exerted by the dynamic gravity control member 9 on the glass melt 5 supplied from the glass melt supply port 3. Is controlled, the displacement and deformation are repeated, and stretching of the glass is performed.
- the glass with low viscosity causes the displacement in the width direction by the function of gravity in this shallow moat, and the dynamic control member Because gravity and surface tension work to approach a constant thickness even when passing the top of the glass, while passing through this, the glass spreads laterally and leveling of the thickness occurs, and by repeating this, the thickness distribution A small, wide, molten glass ribbon is formed.
- a wall 22 is also provided on both sides in the width direction of the lip, which also serves as a gas generating member for containing the glass within a certain width.
- grooves 20 for venting gas and holes 21 are provided as appropriate, and the gas is designed to escape through them behind the support member.
- FIG. 3 is a plan view of a portion for forming a glass ribbon to be supplied with a lip force into a flat glass sheet having a uniform thickness
- FIG. 4 shows an installation state of a dynamic gravity member.
- the glass ribbon 10 causes displacement and deformation repeatedly by the action of gravity by the dynamic gravity control member 14 installed on the support plate 13 and at the same time the movement of the glass ribbon and the influence of gravity in the width direction by the dynamic gravity control member 14 And the glass is stretched in the width direction.
- a tensile stress application jig with pins etc. on the surface of the glass ribbon 15 In addition, tensile stress is applied in a direction parallel to the flow direction of the glass by the downstream transport rolls etc., and thinning and flattening of the glass ribbon are performed.
- the glass is supported only on the top of the dynamic gravity control member, and it becomes less likely to generate a thermal strain, and the tension with tension promotes planarization. Be done.
- the gas generation support member is appropriately provided with a groove 23 and a hole 24 for gas discharge, and the pressure of the gas ejected from the support plate 13 and the dynamic gravity control member 14 is It is designed not to be excessive.
- the gas component in the present embodiment may be either air or water, which is easily gasified by the heat of the glass.
- the present technology in combination with other method of manufacturing glass sheet, and it may be useful.
- the composition range of the adaptive glass is not limited to soda lime silicate glass, and it is possible to use porosilicate glass, so-called alkali-free glass for display, glass having improved acid resistance and brittle resistance, various color glasses, and partial crystallization.
- Suitable for various glass compositions such as glass It is usable. In that case, depending on the physical properties of the glass according to the composition, conditions such as dynamic gravity control and application of tensile stress, temperature, degree, and speed of molding range of basic requirements of this technology. It can be selected and set within.
- the present invention is a high-quality sheet glass which is free from defects and spots on the surface, exhibits smoothness on the nano level, and flatness of the entire product, and is substantially free of tin and the like. Information can be produced inexpensively and simply, and the complexity in terms of equipment and process control is eliminated, and the supply of high-quality sheet glass suitable for display applications can be made inexpensively and easily. It is expected that the effects on advanced industries such as association will be very large.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Surface Treatment Of Glass (AREA)
- Glass Compositions (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05811643A EP1845067A1 (en) | 2004-12-16 | 2005-12-02 | Process for producing plate glass |
JP2006548763A JPWO2006064674A1 (ja) | 2004-12-16 | 2005-12-02 | 板ガラスの製法 |
US11/721,708 US20090235693A1 (en) | 2004-12-16 | 2005-12-02 | Manufacturing Method of Plate Glass |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004-364019 | 2004-12-16 | ||
JP2004364019 | 2004-12-16 | ||
JP2004-365165 | 2004-12-17 | ||
JP2004365165 | 2004-12-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006064674A1 true WO2006064674A1 (ja) | 2006-06-22 |
Family
ID=36587731
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/022167 WO2006064674A1 (ja) | 2004-12-16 | 2005-12-02 | 板ガラスの製法 |
Country Status (5)
Country | Link |
---|---|
US (1) | US20090235693A1 (ja) |
EP (1) | EP1845067A1 (ja) |
JP (1) | JPWO2006064674A1 (ja) |
KR (1) | KR20070086292A (ja) |
WO (1) | WO2006064674A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008090864A1 (ja) | 2007-01-25 | 2008-07-31 | National Institute Of Advanced Industrial Science And Technology | シリコン基板の製造装置、製造方法及びシリコン基板 |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8713967B2 (en) * | 2008-11-21 | 2014-05-06 | Corning Incorporated | Stable glass sheet and method for making same |
JP2012126615A (ja) * | 2010-12-16 | 2012-07-05 | Asahi Glass Co Ltd | フラットパネルディスプレイ用カバーガラス |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001180950A (ja) * | 1999-12-28 | 2001-07-03 | Asahi Glass Co Ltd | 連続薄肉板硝子の改良製法 |
JP2002047017A (ja) * | 2000-07-28 | 2002-02-12 | Asahi Glass Co Ltd | 幅広板硝子の製法改良 |
JP2002047018A (ja) * | 2000-07-28 | 2002-02-12 | Asahi Glass Co Ltd | 幅広板硝子の新規製法及びその装置 |
JP2004026535A (ja) * | 2002-06-24 | 2004-01-29 | Asahi Glass Co Ltd | 板硝子の製造方法及び装置 |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1997031868A1 (fr) * | 1996-02-29 | 1997-09-04 | Asahi Glass Company Ltd. | Processus de formation de verre plat |
-
2005
- 2005-12-02 KR KR1020077013604A patent/KR20070086292A/ko not_active Application Discontinuation
- 2005-12-02 US US11/721,708 patent/US20090235693A1/en not_active Abandoned
- 2005-12-02 EP EP05811643A patent/EP1845067A1/en not_active Withdrawn
- 2005-12-02 JP JP2006548763A patent/JPWO2006064674A1/ja active Pending
- 2005-12-02 WO PCT/JP2005/022167 patent/WO2006064674A1/ja active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001180950A (ja) * | 1999-12-28 | 2001-07-03 | Asahi Glass Co Ltd | 連続薄肉板硝子の改良製法 |
JP2002047017A (ja) * | 2000-07-28 | 2002-02-12 | Asahi Glass Co Ltd | 幅広板硝子の製法改良 |
JP2002047018A (ja) * | 2000-07-28 | 2002-02-12 | Asahi Glass Co Ltd | 幅広板硝子の新規製法及びその装置 |
JP2004026535A (ja) * | 2002-06-24 | 2004-01-29 | Asahi Glass Co Ltd | 板硝子の製造方法及び装置 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008090864A1 (ja) | 2007-01-25 | 2008-07-31 | National Institute Of Advanced Industrial Science And Technology | シリコン基板の製造装置、製造方法及びシリコン基板 |
Also Published As
Publication number | Publication date |
---|---|
KR20070086292A (ko) | 2007-08-27 |
EP1845067A1 (en) | 2007-10-17 |
US20090235693A1 (en) | 2009-09-24 |
JPWO2006064674A1 (ja) | 2008-08-07 |
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