WO2013118564A1 - 板ガラス製造装置、及び板ガラス製造方法 - Google Patents
板ガラス製造装置、及び板ガラス製造方法 Download PDFInfo
- Publication number
- WO2013118564A1 WO2013118564A1 PCT/JP2013/050957 JP2013050957W WO2013118564A1 WO 2013118564 A1 WO2013118564 A1 WO 2013118564A1 JP 2013050957 W JP2013050957 W JP 2013050957W WO 2013118564 A1 WO2013118564 A1 WO 2013118564A1
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- WIPO (PCT)
- Prior art keywords
- bathtub
- plate glass
- bottom wall
- heat insulating
- insulating member
- Prior art date
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B18/00—Shaping glass in contact with the surface of a liquid
- C03B18/02—Forming sheets
- C03B18/16—Construction of the float tank; Use of material for the float tank; Coating or protection of the tank wall
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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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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
- C03C3/091—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium
- C03C3/093—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium containing zinc or zirconium
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
- F27B3/10—Details, accessories, or equipment peculiar to hearth-type furnaces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
- F27B3/10—Details, accessories, or equipment peculiar to hearth-type furnaces
- F27B3/20—Arrangements of heating devices
Definitions
- the present invention relates to a plate glass manufacturing apparatus and a plate glass manufacturing method.
- the plate glass manufacturing apparatus includes a bathtub that accommodates molten metal (for example, molten tin), and flows molten glass continuously supplied onto the molten metal onto the molten metal to form a glass ribbon (for example, Patent Document 1). reference).
- molten metal for example, molten tin
- the formed glass ribbon is pulled up obliquely upward from the molten metal and sent to a slow cooling furnace.
- the glass ribbon slowly cooled in the slow cooling furnace is cut into a predetermined size and shape by a cutting device to obtain a plate glass as a product.
- the plate glass may be polished.
- the bathtub is formed in a box shape opened upward and is composed of a plurality of bricks.
- a heater for heating the glass ribbon and the molten metal is provided above the bathtub.
- a cooler that cools the entire lower surface of the bathtub to a temperature equal to or lower than the melting point of the molten metal is provided below the bathtub in order to suppress the outflow of the molten metal from the joint (gap) between the bricks. Therefore, since the heat given by the heater is removed by the cooler, the energy use efficiency is poor.
- This invention is made
- a plate glass manufacturing apparatus comprising a bathtub for containing molten metal, and forming molten glass continuously supplied onto the molten metal on the molten metal to form a glass ribbon
- the bathtub is formed of carbon or boron nitride.
- the bathtub is made of carbon, and at least a part of the exposed portion of the surface of the bathtub is covered with an antioxidant film.
- a heat insulating member including a side wall portion that surrounds the side of the bathtub and a bottom wall portion that is disposed below the bathtub.
- the plate glass manufacturing method by the other aspect of this invention is the following.
- a glass sheet manufacturing method comprising a step of flowing molten glass continuously supplied onto a molten metal in a bathtub to form a glass ribbon by flowing on the molten metal,
- the bathtub is formed of carbon or boron nitride.
- the bathtub is made of carbon, and at least a part of the exposed portion of the surface of the bathtub is covered with an antioxidant film.
- a heat insulating member configured by a side wall portion that surrounds the side of the bathtub and a bottom wall portion that is disposed below the bathtub is disposed. It is preferable that
- a space is formed between the bottom wall portion of the bathtub and the bottom wall portion of the heat insulating member.
- a heating element is disposed in the space.
- an airtight case composed of a side wall surrounding the side of the heat insulating member and a bottom wall covering the lower side of the heat insulating member is disposed outside the heat insulating member.
- the plate glass is expressed in terms of mass% based on oxide, SiO 2 : 50 to 66%, Al 2 O 3 : 10.5 to 24%, B 2 O 3 : 0-12%, MgO: 0-8%, CaO: 0-14.5%, SrO: 0-24%, BaO: 0-13.5%, ZrO 2 : 0-5%, MgO + CaO + SrO + BaO: It is preferably made of an alkali-free glass of 9 to 29.5%.
- the plate glass is expressed in terms of mass% based on oxide, SiO 2 : 58 to 66%, Al 2 O 3 : 15 to 22%, B 2 O 3 : 5 to 12%, MgO: 0 to 8%, CaO: It is preferably made of an alkali-free glass containing 0 to 9%, SrO: 3 to 12.5%, BaO: 0 to 2%, and MgO + CaO + SrO + BaO: 9 to 18%.
- a plate glass manufacturing apparatus and a plate glass manufacturing method with high energy use efficiency are provided.
- FIG. 1 is a cross-sectional view showing a part of a glass sheet manufacturing apparatus according to an embodiment of the present invention.
- FIG. 2 is a cross-sectional view showing a connection mode between adjacent bottom wall blocks.
- FIG. 3 is a cross-sectional view illustrating a connection mode between adjacent bottom wall blocks according to a first modification.
- FIG. 4 is a cross-sectional view showing a connection mode between adjacent bottom wall blocks according to a second modification.
- the upstream side in the conveyance direction of the glass ribbon is defined as the upstream side
- the downstream side in the conveyance direction of the glass ribbon is defined as the downstream side.
- FIG. 1 is a cross-sectional view showing a part of a plate glass manufacturing apparatus according to an embodiment of the present invention.
- the plate glass manufacturing apparatus 10 includes a bathtub 21 that accommodates a molten metal (for example, molten tin) M, and flows the molten glass G1 continuously supplied on the molten metal M over the molten metal M to form a glass ribbon G2. To do.
- the formed glass ribbon G2 is pulled up obliquely upward from the molten metal M and sent to a slow cooling furnace.
- the glass ribbon slowly cooled in the slow cooling furnace is cut into a predetermined size and shape by a cutting device to obtain a plate glass as a product.
- the plate glass may be polished.
- the glass sheet manufacturing apparatus 10 further includes a ceiling 22 that covers the upper side of the bathtub 21.
- the ceiling 22 is provided with a gas supply path 24 that supplies a reducing gas to a space between the ceiling 22 and the bathtub 21.
- a heater 25 is inserted into the gas supply path 24, and a heat generating portion 25 a of the heater 25 is disposed above the bathtub 21.
- the gas supply path 24 supplies reducing gas to the space between the bathtub 21 and the ceiling 22 in order to prevent oxidation of the molten metal M in the bathtub 21.
- the reducing gas contains, for example, 1 to 15% by volume of hydrogen gas and 85 to 99% by volume of nitrogen gas.
- the space between the bathtub 21 and the ceiling 22 is maintained at a pressure higher than the atmospheric pressure in order to prevent air from entering from the outside.
- a plurality of heaters 25 are arranged at intervals in the flow direction and the width direction of the glass ribbon G2, for example.
- the output of the heater 25 is controlled so that the temperature of the glass ribbon G2 becomes higher toward the upstream side in the flow direction of the glass ribbon G2.
- the output of the heater 25 is controlled so that the thickness of the glass ribbon G2 is uniform in the width direction.
- the plate glass manufacturing apparatus 10 is characterized by the lower structure 40.
- the lower structure 40 includes a bathtub 21, a heat insulating member 41, a space forming member 42, a heating element 43, a case 44, a support member 45, and the like.
- the bathtub 21 has a box shape opened upward, and includes a plurality of side wall blocks 26 and a plurality of bottom wall blocks 27.
- Each side wall block 26 and each bottom wall block 27 are made of carbon (including graphite and amorphous carbon) or boron nitride (BN).
- the bathtub 21 is formed with carbon or boron nitride (BN), the wettability with the molten metal M accommodated in the bathtub 21 is low compared with the case where it is formed with the conventional brick. . Therefore, since the molten metal M hardly flows out from the joint (gap) of the bathtub 21, a cooler for cooling the entire lower surface of the bathtub 21 to a temperature equal to or lower than the melting point of the molten metal M is unnecessary. Therefore, energy use efficiency is good.
- BN boron nitride
- the bathtub 21 When the bathtub 21 is formed of carbon, at least a part of the exposed portion (portion not in contact with the molten metal M) of the surface of the bathtub 21 may be covered with an antioxidant film in order to prevent the carbon from being burned out.
- the antioxidant film may be a ceramic film such as silicon carbide (SiC) or silica (SiO 2 ).
- SiC silicon carbide
- SiO 2 silica
- a thermal spraying method is used as a thermal spraying method.
- FIG. 2 is a cross-sectional view showing a connection mode between adjacent bottom wall blocks.
- connection aspect of the block 27 for bottom walls and the block 26 for side walls which are adjacent is the same, illustration is abbreviate
- Adjacent bottom wall blocks 27A and 27B may be connected by bolts 28.
- the bolt 28 passes through one bottom wall block 27A and is screwed to the other bottom wall block 27B.
- the bolt 28 may be formed of the same carbon as the bottom wall blocks 27A and 27B.
- the opposing surfaces 29A and 29B of the adjacent bottom wall blocks 27A and 27B are vertical planes, and may be in contact with each other.
- a heat-resistant sealing member 31 that seals the gap may be disposed in order to reliably prevent the molten metal M from flowing out.
- the heat resistant seal member 31 is formed of a material having high corrosion resistance against the molten metal M, and may be formed of a material that can be deformed during use. Specific examples include glass that softens at the operating temperature.
- the heat-resistant sealing member 31 may be supported by the groove portions 32A and 32B formed on at least one (both in FIG. 2) of the opposing surfaces 29A and 29B of the adjacent bottom wall blocks 27A and 27B.
- the heat insulating member 41 is disposed outside the bathtub 21. Unlike the bathtub 21, the heat insulating member 41 does not come into contact with the molten metal M, so that corrosion resistance to the molten metal M is not required.
- a material of the heat insulating member 41 for example, a fibrous heat insulating material such as ceramic wool or glass wool having low thermal conductivity can be used.
- the heat insulating member 41 has a box shape opened upward, and includes an annular side wall portion 41 a surrounding the side of the bathtub 21 and a bottom wall portion 41 b disposed below the bathtub 21.
- the bathtub 21 can be efficiently heated by arranging the heat insulating member 41 outside the bathtub 21.
- the thickness of the bottom wall portion 41b of the heat insulating member 41 may be such that the upstream portion 41c is thick and the downstream portion 41d is thin. Since heat dissipation proceeds in the downstream portion 41d, the flow distance of the glass ribbon G2 for reducing the temperature of the glass ribbon G2 to a temperature that can be pulled up from the molten metal M can be shortened.
- the space forming member 42 forms a space S between the bottom wall portion 21 b of the bathtub 21 and the bottom wall portion 41 b of the heat insulating member 41 in order to suppress heat conduction from the bathtub 21 to the heat insulating member 41.
- the annular side wall 21 a of the bathtub 21 is smaller than the annular side wall 41 a of the heat insulating member 41, and a space is also formed between the side wall 21 a of the bathtub 21 and the side wall 41 a of the heat insulating member 41.
- the space forming member 42 may be fixed to the bottom wall portion 44b of the case 44 through the heat insulating member 41 as shown in FIG.
- a plurality of space forming members 42 may be provided at intervals.
- the space forming member 42 is disposed as a spacer between the bottom wall portion 41 b of the heat insulating member 41 and the bottom wall portion 21 b of the bathtub 21 when the heat insulating member 41 is a block-like sintered body and is hard. Good.
- the space forming member 42 is loaded with the load of the bathtub 21 and the heat of the bathtub 21 is transmitted. Therefore, the space forming member 42 is formed of a material (for example, silicon carbide, heat resistant alloy, etc.) having high load bearing strength and heat resistance.
- the space forming member 42 may be formed of a plurality of types of materials.
- the upper portion of the space forming member 42 may be formed of silicon carbide, and the lower portion of the space forming member 42 may be formed of a heat resistant alloy.
- the heating element 43 is configured by a heater or the like, and is disposed in the space S between the bottom wall portion 21 b of the bathtub 21 and the bottom wall portion 41 b of the heat insulating member 41.
- the bathtub 21 can be efficiently heated from below.
- a plurality of heating elements 43 may be arranged at intervals in the horizontal direction.
- the output of each heating element 43 may be set to be higher toward the downstream side.
- the case 44 has a box shape opened upward, is disposed outside the heat insulating member 41, and has an annular side wall 44 a that surrounds the side of the heat insulating member 41, and a bottom wall 44 b that covers the lower side of the heat insulating member 41. Consists of.
- the case 44 has airtightness and suppresses oxidation of the molten metal M due to intrusion of outside air.
- the case 44 is formed, for example, by joining together a plurality of metal plates (stainless steel plate or iron plate) by welding.
- the heat insulating member 41 may be attached to the inside of the case 44.
- the support member 45 is a columnar member that is fixed to the floor Fr and supports the case 44. Since the support member 45 is deprived of heat from the floor Fr, high heat resistance is not required.
- the support member 45 is made of a material having a high load bearing strength. Examples of the material of the support member 45 include stainless steel (SUS) and cast iron.
- molten glass G1 continuously supplied onto a molten metal (for example, molten tin) M in a bathtub 21 is caused to flow on the molten metal M to be formed into a glass ribbon G2.
- the formed glass ribbon G2 is pulled up obliquely upward from the molten metal M and sent to a slow cooling furnace.
- the glass ribbon slowly cooled in the slow cooling furnace is cut into a predetermined size and shape by a cutting device to obtain a plate glass as a product.
- the plate glass may be polished.
- the bathtub 21 is formed of carbon or boron nitride, the wettability with the molten metal M accommodated in the bathtub 21 is low as compared with the case where the bathtub 21 is formed of conventional bricks. Therefore, the molten metal M hardly flows out from the joint of the bathtub 21, and a cooler for cooling the entire lower surface of the bathtub 21 to a temperature equal to or lower than the melting point of the molten metal M is unnecessary. Therefore, energy use efficiency is good.
- a heat insulating member 41 composed of an annular side wall portion 41 a surrounding the side of the bathtub 21 and a bottom wall portion 41 b covering the lower side of the bathtub 21 is arranged outside the bathtub 21. It's okay.
- a space S may be formed between the bottom wall portion 21 b of the bathtub 21 and the bottom wall portion 41 b of the heat insulating member 41 in order to suppress heat conduction from the bathtub 21 to the heat insulating member 41.
- the heating element 43 may be arranged in the space S.
- the bathtub 21 can be efficiently heated from below.
- a plurality of heating elements 43 may be arranged at intervals in the horizontal direction.
- the output of each heating element 43 may be set to be higher toward the downstream side.
- the heat insulating member 41 includes an annular side wall 44 a surrounding the side of the heat insulating member 41 and a bottom wall 44 b covering the lower side of the heat insulating member 41.
- An airtight case 44 may be disposed. The oxidation of the molten metal M can be suppressed.
- the case 44 is formed, for example, by joining together a plurality of metal plates by welding.
- the heat insulating member 41 may be attached to the inside of the case 44.
- Plate glass The kind of glass of plate glass is selected according to the use of plate glass.
- alkali-free glass is used in the case of a glass substrate for LCD.
- soda lime glass is used in the case of a window glass for a vehicle and a window glass for a building.
- soda lime glass is used in the case of a window glass for a vehicle and a window glass for a building.
- a cover glass for a display an alkali silicate glass that can be chemically strengthened is mainly used.
- quartz glass having a low thermal expansion coefficient is mainly used.
- the alkali-free glass is, for example, expressed by mass% based on oxide, SiO 2 : 50 to 66%, Al 2 O 3 : 10.5 to 24%, B 2 O 3 : 0 to 12%, MgO: 0 to 8%, CaO: 0 to 14.5%, SrO: 0 to 24%, BaO: 0 to 13.5%, ZrO 2 : 0 to 5%, MgO + CaO + SrO + BaO: 9 to 29.5%.
- the alkali-free glass may have a total content of alkali metal oxides of 0.1% or less.
- the alkali-free glass is preferably expressed in terms of mass% based on oxide, SiO 2 : 58 to 66%, Al 2 O 3 : 15 to 22%, B 2 O 3 : 5 to 12%, MgO: 0 to 8 %, CaO: 0 to 9%, SrO: 3 to 12.5%, BaO: 0 to 2%, and MgO + CaO + SrO + BaO: 9 to 18%.
- the chemical composition of the plate glass is measured with a commercially available fluorescent X-ray analyzer (for example, ZSX100e, manufactured by Rigaku Corporation).
- the opposing surfaces 29A and 29B of the adjacent bottom wall blocks 27A and 27B are vertical planes, whereas in this modification, a convex portion is formed on one of the opposing surfaces and a concave portion is formed on the other. Is different. Hereinafter, the difference will be mainly described.
- FIG. 3 is a cross-sectional view showing a connection mode of adjacent bottom wall blocks according to the first modification, and corresponds to FIG.
- the adjacent bottom wall blocks 27A and 27B are connected by inserting a convex portion 33A formed on one opposing surface 29A into a concave portion 34B formed on the other opposing surface 29B. Good. In this modification, the bolt 28 shown in FIG. 2 is unnecessary.
- the opposing surfaces 29A and 29B of the adjacent bottom wall blocks 27A and 27B are each a vertical plane, whereas in this modification, the opposing surfaces 29A and 29B are different in that each has a horizontal portion. .
- the difference will be mainly described.
- FIG. 4 is a cross-sectional view showing a connection mode of adjacent bottom wall blocks according to the second modification, and corresponds to FIG.
- the opposing surfaces 29A and 29B of the adjacent bottom wall blocks 27A and 27B may have horizontal portions 36A and 36B, respectively. Between the horizontal portions 36A and 36B facing each other, the outflow of the molten metal M due to gravity becomes gentle.
- the heat resistant seal member 31 may be supported by the groove portion 37A formed in at least one of the horizontal portions 36A and 36B.
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Abstract
Description
溶融金属を収容する浴槽を備え、前記溶融金属上に連続的に供給される溶融ガラスを前記溶融金属上で流動させてガラスリボンに成形する板ガラス製造装置において、
前記浴槽がカーボン又は窒化ホウ素で形成される。
浴槽内の溶融金属上に連続的に供給される溶融ガラスを前記溶融金属上で流動させてガラスリボンに成形する工程を有する板ガラス製造方法であって、
前記浴槽がカーボン又は窒化ホウ素で形成される。
浴槽21は、上方に開放された箱状であって、複数の側壁用ブロック26、及び複数の底壁用ブロック27で構成される。各側壁用ブロック26及び各底壁用ブロック27は、カーボン(グラファイト、非晶質カーボンを含む)又は窒化ホウ素(BN)で形成される。
断熱部材41は、浴槽21の外側に配置される。断熱部材41は、浴槽21とは異なり、溶融金属Mと接触しないので、溶融金属Mに対する耐食性は要求されない。断熱部材41の材料としては、例えば熱伝導率の低いセラミックウール、ガラスウール等の繊維状の断熱材が使用可能である。
空間形成部材42は、浴槽21から断熱部材41への熱伝導を抑えるため、浴槽21の底壁部21bと断熱部材41の底壁部41bとの間に空間Sを形成する。尚、浴槽21の環状の側壁部21aは断熱部材41の環状の側壁部41aよりも小さく、浴槽21の側壁部21aと断熱部材41の側壁部41aとの間にも空間が形成されている。
発熱体43は、ヒータ等で構成され、浴槽21の底壁部21bと断熱部材41の底壁部41bとの間の空間Sに配置される。浴槽21を下方から効率良く加熱することができる。
ケース44は、上方に開放された箱状であって、断熱部材41の外側に配置され、断熱部材41の側方を囲む環状の側壁部44a、及び断熱部材41の下方を覆う底壁部44bで構成される。ケース44は、気密性を有し、外気の浸入による溶融金属Mの酸化を抑制する。ケース44は、例えば複数枚の金属板(ステンレス鋼板、又は鉄板等)を溶接で継ぎ合わせて形成される。ケース44の内側に断熱部材41が貼り付けられてよい。
支持部材45は、床Frに固定され、ケース44を支持する柱状の部材である。支持部材45は、床Frから熱を奪われるので、高い耐熱性は要求されない。支持部材45は、耐荷重強度の高い材料で構成される。支持部材45の材料としては、例えばステンレス鋼(SUS)や鋳鉄等が挙げられる。
板ガラス製造方法は、図1に示すように、浴槽21内の溶融金属(例えば溶融スズ)M上に連続的に供給される溶融ガラスG1を溶融金属M上で流動させてガラスリボンG2に成形する工程を有する。成形されたガラスリボンG2は、溶融金属Mから斜め上方に引き上げられ、徐冷炉に送られる。徐冷炉内で徐冷されたガラスリボンは、切断装置によって所定の寸法形状に切断され、製品である板ガラスが得られる。板ガラスは研磨されていてもよい。
板ガラスのガラスの種類は、板ガラスの用途に応じて選択される。例えばLCD用のガラス基板の場合、無アルカリガラスが用いられる。また、PDP用のガラス基板の場合、車両用の窓ガラス、建築物用の窓ガララスの場合、ソーダライムガラスが用いられる。ディスプレイ用のカバーガラスの場合、化学強化可能なアルカリシリケートガラスが主に用いられる。フォトマスク用の基板の場合、熱膨張係数の低い石英ガラスが主に用いられる。
上記実施形態では隣り合う底壁用ブロック27A、27Bの対向面29A、29Bがそれぞれ鉛直な平面であるのに対し、本変形例では対向面の一方に凸部が形成され、他方に凹部が形成されている点で相違する。以下、相違点を中心に説明する。
上記実施形態では隣り合う底壁用ブロック27A、27Bの対向面29A、29Bがそれぞれ鉛直な平面であるのに対し、本変形例では対向面29A、29Bがそれぞれ水平な部分を有する点で相違する。以下、相違点を中心に説明する。
本出願は、2012年2月8日出願の日本特許出願2012-024752に基づくものであり、その内容はここに参照として取り込まれる。
21 浴槽
21a 浴槽の側壁部
21b 浴槽の底壁部
26 側壁用ブロック
27 底壁用ブロック
41 断熱部材
41a 断熱部材の側壁部
41b 断熱部材の底壁部
42 空間形成部材
43 発熱体
44 ケース
44a ケースの側壁部
44b ケースの底壁部
G1 溶融ガラス
G2 ガラスリボン
M 溶融金属
S 空間
Claims (14)
- 溶融金属を収容する浴槽を備え、前記溶融金属上に連続的に供給される溶融ガラスを前記溶融金属上で流動させてガラスリボンに成形する板ガラス製造装置において、
前記浴槽がカーボン又は窒化ホウ素で形成される板ガラス製造装置。 - 前記浴槽はカーボンで形成され、前記浴槽の表面の露出部分の少なくとも一部は酸化防止膜で覆われている請求項1に記載の板ガラス製造装置。
- 前記浴槽の側方を囲む側壁部と、前記浴槽の下方に配置される底壁部とで構成される断熱部材を備える請求項1又は2に記載の板ガラス製造装置。
- 前記浴槽の底壁部と前記断熱部材の底壁部との間に空間を形成する空間形成部材を備える請求項3に記載の板ガラス製造装置。
- 前記空間に配置される発熱体を備える請求項4に記載の板ガラス製造装置。
- 前記断熱部材の側方を囲む側壁部と、前記断熱部材の下方を覆う底壁部とで構成される気密性を有するケースを備える請求項3~5のいずれか1項に記載の板ガラス製造装置。
- 浴槽内の溶融金属上に連続的に供給される溶融ガラスを前記溶融金属上で流動させてガラスリボンに成形する工程を有する板ガラス製造方法であって、
前記浴槽がカーボン又は窒化ホウ素で形成される板ガラス製造方法。 - 前記浴槽はカーボンで形成され、前記浴槽の表面の露出部分の少なくとも一部は酸化防止膜で覆われている請求項7に記載の板ガラス製造方法。
- 前記浴槽の外側には、前記浴槽の側方を囲む側壁部と、前記浴槽の下方に配置される底壁部とで構成される断熱部材が配置されている請求項7又は8に記載の板ガラス製造方法。
- 前記浴槽の底壁部と前記断熱部材の底壁部との間に空間が形成されている請求項9に記載の板ガラス製造方法。
- 前記空間に発熱体が配置されている請求項10に記載の板ガラス製造方法。
- 前記断熱部材の外側には、前記断熱部材の側方を囲む側壁部と、前記断熱部材の下方を覆う底壁部とで構成される気密性を有するケースが配置されている請求項9~11のいずれか1項に記載の板ガラス製造方法。
- 前記板ガラスは、酸化物基準の質量%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%、ZrO2:0~5%を含有し、MgO+CaO+SrO+BaO:9~29.5%である無アルカリガラスからなる請求項7~12のいずれか1項に記載の板ガラス製造方法。
- 前記板ガラスは、酸化物基準の質量%表示で、SiO2:58~66%、Al2O3:15~22%、B2O3:5~12%、MgO:0~8%、CaO:0~9%、SrO:3~12.5%、BaO:0~2%を含有し、MgO+CaO+SrO+BaO:9~18%である無アルカリガラスからなる請求項13に記載の板ガラス製造方法。
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CN201380008853.3A CN104114505B (zh) | 2012-02-08 | 2013-01-18 | 平板玻璃制造装置和平板玻璃制造方法 |
JP2013557455A JP6070576B2 (ja) | 2012-02-08 | 2013-01-18 | 板ガラス製造装置、及び板ガラス製造方法 |
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KR101347775B1 (ko) | 2009-03-03 | 2014-01-07 | 주식회사 엘지화학 | 유리판 제조용 플로트 배스 시스템 |
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JPS4945779B1 (ja) * | 1968-10-04 | 1974-12-06 | ||
JPH1072237A (ja) * | 1996-06-03 | 1998-03-17 | Asahi Glass Co Ltd | 無アルカリガラスおよび液晶ディスプレイパネル |
JP2006193402A (ja) * | 2004-04-07 | 2006-07-27 | Asahi Glass Co Ltd | 板ガラスの製造装置及び製造方法 |
JP2011219348A (ja) * | 2010-03-26 | 2011-11-04 | Nippon Electric Glass Co Ltd | ガラス板製造装置、及びガラス板製造方法 |
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JPWO2013118564A1 (ja) | 2015-05-11 |
US20140331717A1 (en) | 2014-11-13 |
TW201332911A (zh) | 2013-08-16 |
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CN104114505B (zh) | 2017-04-12 |
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