WO2012133830A1 - ガラス板の製造方法 - Google Patents
ガラス板の製造方法 Download PDFInfo
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- WO2012133830A1 WO2012133830A1 PCT/JP2012/058694 JP2012058694W WO2012133830A1 WO 2012133830 A1 WO2012133830 A1 WO 2012133830A1 JP 2012058694 W JP2012058694 W JP 2012058694W WO 2012133830 A1 WO2012133830 A1 WO 2012133830A1
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- molten glass
- transfer pipe
- temperature
- glass
- glass plate
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- 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
- C03B17/064—Forming glass sheets by the overflow downdraw fusion process; Isopipes therefor
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- 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
- C03B18/18—Controlling or regulating the temperature of the float bath; Composition or purification of the float bath
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B7/00—Distributors for the molten glass; Means for taking-off charges of molten glass; Producing the gob, e.g. controlling the gob shape, weight or delivery tact
- C03B7/02—Forehearths, i.e. feeder channels
- C03B7/06—Means for thermal conditioning or controlling the temperature of the glass
Definitions
- the present invention relates to a method for producing a glass plate.
- Such a flat panel display substrate glass plate is often manufactured by the overflow downdraw method.
- the overflow downdraw method is a method known per se. For example, as described in Patent Document 1 (U.S. Pat. No. 3,338,696), the molten glass is poured into the molded body and overflowed. Is a method of forming a ribbon-like glass by drawing down on each outer surface of the molded body, and extending downward at the place where the molded body joins at the bottom.
- a glass plate for a TFT liquid crystal display is required to have high thermal stability. Therefore, a glass raw material prepared so as to realize the glass plate is used for manufacturing the glass plate. Since such glass raw materials are usually poorly soluble, striae (parts having different components from the surrounding parts) are likely to occur in the molten glass. And when striae exist in the molten glass, when the glass ribbon formed by the molding apparatus is pulled down, the stretched state differs depending on the difference in viscosity between the surrounding portion and the striae. The degree will get worse.
- Patent Document 2 Japanese Patent Application Laid-Open No. 2004-67408 has a technique for suppressing the occurrence of striae by using a silica raw material having an average particle size of 30 to 60 ⁇ m. Proposed.
- an object of the present invention is to provide a glass plate manufacturing method capable of effectively reducing striae.
- the inventors of the present invention have conducted intensive research on a method for effectively reducing striae, (I) The suppression of striae requires that the molten glass supplied to the molding apparatus be homogeneous, (Ii) To make the molten glass supplied to the molding apparatus homogeneous, the temperature of the supplied molten glass needs to be uniform throughout. I found.
- This invention is made from such a viewpoint, and the manufacturing method of the glass plate which concerns on this invention flows molten glass toward the other end from the one end of a transfer pipe, and supplies molten glass to a shaping
- a method including a supply step, wherein after the temperature of the molten glass is lowered by 150 ° C. or more at an average rate of 30 ° C./m or less in the supply step, the molten glass is moved from the molten glass in the interface region in contact with the inside of the transfer tube. Further, it is characterized in that it is supplied to the molding apparatus through a portion of the transfer pipe having a high temperature.
- the temperature of the molten glass is lowered at a rate of 50 ° C./m or more, and then the temperature of the molten glass is lowered at a rate lower than 50 ° C./m. It is preferable that the rate of lowering the temperature of the molten glass is 30 ° C./m or less on average.
- the manufacturing method of the glass plate which concerns on this invention flows molten glass, reducing temperature toward the other end from the one end of a transfer pipe, and supplies molten glass to the shaping
- the manufacturing method of the glass plate which concerns on this invention is the temperature of the molten glass in the center part of the cross section of a transfer pipe by lowering
- the molten glass in the method for producing a glass plate according to the present invention, in the supplying step, after the temperature of the molten glass is lowered, the molten glass is moved to a portion of the transfer tube having a higher temperature than the molten glass in the interface region in contact with the inside of the transfer tube. It is preferable to reduce the temperature difference between the temperature of the molten glass at the central portion of the cross section of the transfer tube and the temperature of the molten glass at the peripheral portion of the cross section of the transfer tube by supplying to the forming apparatus.
- the glass plate production method according to the present invention can be applied to the production of any glass plate, particularly a liquid crystal display device, a plasma display device, etc. It is suitable for manufacturing a glass substrate for flat panel display or a cover glass covering the display portion.
- glass raw materials are first prepared so as to have a desired glass composition.
- the raw materials when manufacturing a glass substrate for a flat panel display, it is preferable to prepare the raw materials so as to have the following composition.
- P RO: 5 to 20% by mass (wherein R is at least one selected from Mg, Ca, Sr and Ba),
- the glass for a liquid crystal substrate may be non-alkali glass that does not substantially contain RO.
- the above glass for a liquid crystal substrate may be mixed with raw materials so as to have the following composition.
- E ′) CaO: 0 to 20% by mass
- O ′ BaO: 0 to 10% by mass
- said glass for liquid crystal substrates does not contain arsenic and antimony substantially. That is, even if these substances are included, they are included as impurities.
- the glasses of the present invention may contain various other oxides to adjust the various physical, melting, fining, and forming characteristics of the glass.
- examples of such other oxides include, but are not limited to, SnO 2 , TiO 2 , MnO, ZnO, Nb 2 O 5 , MoO 3 , Ta 2 O 5 , WO 3 , Y 2 O 3 , and it includes La 2 O 3.
- Nitrate and carbonate can be used as the RO supply source in (p) in the above (a) to (r).
- nitrate as a supply source of RO at a ratio suitable for the process.
- the glass plate manufactured in the present embodiment is manufactured continuously unlike a system in which a certain amount of glass raw material is supplied to a melting furnace and batch processing is performed.
- the glass plate applied in the production method of the present invention may be a glass plate having any thickness and width.
- the glass plate manufacturing method according to an embodiment of the present invention includes a series of steps shown in the flowchart of FIG. 1 and uses the glass plate manufacturing line 100 shown in FIG.
- the glass raw material prepared to have the above composition is first melted in the melting step (step S101).
- the raw material is put into the melting tank 101 and heated to a predetermined temperature.
- the predetermined temperature is preferably 1550 ° C. or higher.
- the heated raw material melts to form molten glass.
- the molten glass is fed into the clarification tank 102 where the next clarification step (step S102) is performed through the first transfer pipe 105a.
- the molten glass is clarified. Specifically, when the molten glass is heated to a predetermined temperature in the clarification tank 102, the gas component contained in the molten glass forms bubbles or vaporizes and escapes out of the molten glass.
- the predetermined temperature is preferably 1610 ° C. to 1700 ° C.
- the clarified molten glass is sent through the second transfer pipe 105b to the agitation tank 103 where the next step, the homogenization step (step S103), is performed.
- the molten glass is homogenized. Specifically, the molten glass is homogenized in the stirring tank 103 by being stirred by a stirring blade (not shown) provided in the stirring tank 103.
- the molten glass fed into the stirring vessel 103 is heated so as to be in a predetermined temperature range.
- the predetermined temperature range is preferably 1440 ° C. to 1500 ° C.
- the homogenized molten glass is sent from the stirring tank 103 to the third transfer pipe 105c.
- the molten glass is cooled to a temperature suitable for molding in the third transfer pipe 105c, and sent to the molding apparatus 104 where the next molding process (step S105) is performed.
- the temperature suitable for molding is preferably about 1200 ° C.
- the molten glass is formed into a plate-like glass.
- the molten glass is continuously formed into a ribbon shape by the overflow downdraw method.
- the formed ribbon-shaped glass is cut into a glass plate.
- the molten glass is cooled to a temperature suitable for the forming process (step S105).
- the temperature of the molten glass is preferably lowered by at least 150 ° C.
- molten glass at 1440 ° C. to 1500 ° C. is cooled to about 1200 ° C. in the supply step (step S104) in the homogenization step (step S103).
- the 3rd transfer pipe 105c in which a supply process is performed can control the temperature of the molten glass passing through the 3rd transfer pipe 105c.
- the third transfer pipe 105c is preferably made of a refractory metal that can withstand contact with molten glass at a high temperature, and more preferably made of platinum or a platinum alloy.
- a heater 201 is attached to the outer periphery on the downstream side of the third transfer pipe 105c.
- the heater 201 is connected to the temperature control device 202.
- the heater 201 heats the molten glass flowing in the downstream part of the third transfer pipe 105c by heating the downstream part of the third transfer pipe 105c.
- the temperature control device 202 controls the temperature of the molten glass flowing in the downstream portion of the third transfer pipe 105c by controlling the output of the heater 201.
- the cooling rate of the molten glass is preferably 30 ° C./m or less on average while the molten glass flows from the upstream end to the downstream end of the third transfer pipe 105c.
- the cooling rate of the molten glass is preferably 30 ° C./m or less on average while the molten glass flows from the upstream end to the downstream end of the third transfer pipe 105c.
- a molten glass of 1500 ° C. flows from the upstream end to the downstream end of the third transfer pipe 105 c having a total length of about 10 m, it is cooled by 300 ° C. at the maximum to become a molten glass of 1200 ° C. or higher to form the molding apparatus 104. It is preferable to flow out.
- the molten glass is cooled in the process of flowing through the third transfer pipe 105c. More specifically, heat transfer occurs from the molten glass to the third transfer pipe 105c as the molten glass flows through the third transfer pipe 105c having a temperature lower than that of the molten glass. As a result, the temperature of the molten glass is lowered to the vicinity of the temperature of the third transfer pipe 105c. In that case, the closer the distance in the cross-sectional direction from the third transfer pipe 105c is, the easier it is to transfer heat to the third transfer pipe 105c, and thus the closer the temperature is to the temperature of the third transfer pipe 105c.
- the temperature of the molten glass flowing in the third transfer pipe 105c is closest to the temperature of the third transfer pipe 105c itself on the inner surface of the third transfer pipe 105c, and from the inner surface to the third transfer pipe.
- the difference from the temperature of the third transfer pipe 105c itself increases toward the center of 105c. Therefore, the difference between the temperature of the molten glass and the temperature of the third transfer pipe 105c increases from the outer periphery of the third transfer pipe 105c toward the center. This is shown in the graph of the left (a) of FIG. Therefore, the temperature of the molten glass may be non-uniform in the cross-sectional direction of the third transfer pipe 105c.
- the inventor has discovered that supplying molten glass with a non-uniform temperature to the molding apparatus 104 hinders the formation of homogeneous glass. Therefore, it is preferable to supply molten glass having a uniform temperature to the molding apparatus 104. And the inventor further discovered that the molten glass with uniform temperature can be supplied to the shaping
- the downstream portion of the third transfer pipe 105c is heated by the heater 201 to a temperature higher than the temperature of the molten glass that flows to the part and contacts the inside of the third transfer pipe 105c.
- heat transfer occurs from the third transfer pipe 105c to the molten glass on the downstream side of the third transfer pipe 105c.
- the molten glass is heated to near the temperature of the third transfer pipe 105c. In that case, the closer the distance from the third transfer pipe 105c to the molten glass, the easier the heat transfer from the third transfer pipe 105c.
- the molten glass that flows to the downstream portion of the third transfer pipe 105c is moved from the peripheral part of the cross section of the third transfer pipe 105c toward the center part as shown in the graph of the left (a) of FIG.
- the temperature is increased, and a temperature difference is generated in the cross-sectional direction of the third transfer pipe 105c.
- the downstream portion of the third transfer pipe 105c by creating a state in which the temperature of the molten glass is less likely to increase as it goes from the peripheral part to the center part of the cross section of the third transfer pipe 105c.
- the temperature difference is offset. That is, the temperature difference between the temperature of the molten glass at the center of the cross section of the third transfer tube 105c and the temperature of the molten glass at the periphery of the cross section of the third transfer tube 105c is reduced.
- the temperature of the downstream portion of the third transfer pipe 105c heated by the heater 201 is preferably higher than the temperature of the third transfer pipe 105c in the vicinity of the upstream side.
- it is preferably 1 ° C. or higher, more preferably 5 ° C. or higher, and more preferably 10 ° C. or higher.
- the heat of the third transfer pipe 105c in the portion is transferred to the third transfer pipe 105c.
- the temperature difference of the molten glass in the cross-sectional direction of the third transfer pipe 105c can be reduced as shown in the graph on the right (b) of FIG. it can.
- the temperature distribution in the longitudinal direction of the third transfer pipe 105c is as shown in the graph of FIG.
- the molten glass is cooled as slowly as possible immediately before flowing out to the molding apparatus 104. Further, it may be cooled at a rate faster than 30 ° C./m upstream of the third transfer pipe 105c. That is, if the average rate of cooling the molten glass from entering the third transfer pipe 105c to flowing out is 30 ° C./m or less, for example, the temperature around the third transfer pipe 105c is By controlling, in the upstream part of the third transfer pipe 105c, the molten glass is cooled at a rate of 50 ° C./m or more, and then reaches the downstream part of the third transfer pipe 105c heated by the heater 201. The molten glass may be cooled at a rate lower than 50 ° C./m. In this case, the temperature distribution in the longitudinal direction of the third transfer pipe 105c is as shown in the graph of FIG.
- a glass plate with reduced striae can be produced by actually using the method for producing a glass plate according to the present invention.
- composition SiO 2: 60.9 wt%, B 2 O 3: 11.6 wt%, Al 2 O 3: 16.9 wt%, MgO: 1.7 wt%, CaO: 5.1 Weight %, SrO: 2.6 mass%, BaO: 0.7 mass%, K 2 O: 0.25 mass%, Fe 2 O 3 : 0.15 mass%, SnO 2 : 0.13 mass%
- the raw materials were prepared so that Next, the raw material was charged into the dissolution tank 101.
- the glass plate manufacturing apparatus 100 shown in FIG. 2 including the third transfer pipe 105c shown in FIG. 3 for the molten glass generated in the melting tank 101, and the glass plate manufacturing according to this embodiment of the present invention described above. A glass plate was manufactured using the method.
- the temperature of the molten glass is increased from 1440 ° C. to 1200 ° C. while flowing the molten glass from the upstream end to the downstream end through the third transfer pipe having an average inner diameter of about 146 mm and a total length of about 8 m. Lowered. That is, the cooling rate of the melting temperature was about 30 ° C./m.
- a portion having a length of about 300 mm and an inner diameter of about 140 mm at the downstream end of the third transfer pipe 105c heated to 1220 ° C. was passed.
- a glass plate having a size of 1100 mm ⁇ 1300 mm was manufactured by using an overflow down draw method for molten glass.
- the average temperature of 30 ° C./m or less is obtained while the molten glass flows from the entrance to the exit of the third transfer pipe 105c.
- the temperature of the molten glass is lowered by 150 ° C. or more (for example, about 240 ° C. to 300 ° C. in the case of a glass substrate for a flat panel display having the above composition).
- the molten glass is passed through a portion of the third transfer pipe 105c that is higher than the temperature of the molten glass in the interface region in contact with the inside of the third transfer pipe 105c.
- the heat of the third transfer pipe 105c is transmitted from the interface between the inner side of the third transfer pipe 105c and the molten glass toward the center, thereby reducing the temperature difference of the molten glass in the cross-sectional direction of the third transfer pipe 105c.
- the molten glass is slowly cooled, and the temperature of the molten glass supplied to the molding apparatus 104 becomes uniform as a whole, and striae can be reduced.
- step S104 in a supply process (step S104), while a molten glass flows from the entrance of the 3rd transfer pipe 105c to an exit, the temperature of a molten glass is a shaping
- the molten glass flowing through the third transfer pipe 105c is less likely to transfer heat as it goes from the peripheral part to the center part of the cross section of the third transfer pipe 105c.
- the molten glass that flows to the downstream side of the third transfer pipe 105c is originally from the peripheral part to the center part of the cross section of the third transfer pipe 105c, as shown in the graph of the left (a) of FIG. As it goes, the temperature increases, and a temperature difference is generated in the cross-sectional direction of the third transfer pipe 105c.
- the temperature difference is offset. That is, the temperature difference between the temperature of the molten glass at the center of the cross section of the third transfer tube 105c and the temperature of the molten glass at the peripheral portion of the cross section of the third transfer tube 105c is reduced. Thereby, the temperature of the molten glass supplied to the shaping
- the molten glass is preferably supplied to a molding apparatus that forms the molten glass into a glass ribbon at a temperature suitable for molding.
- the temperature suitable for molding is preferably in the range of 1190 ° C. to 1220 ° C., and more preferably about 1200 ° C.
- This supply step is performed in the third transfer pipe 105c shown in FIG. 2 which is a transfer pipe.
- the molten glass flows out of the stirring tank 103 of FIG. 2, enters the third transfer pipe 105 c, passes through the third transfer pipe 105 c, and flows out to the molding apparatus 104. It is preferable that the temperature of the molten glass is gradually decreased from 1440 ° C. to 1500 ° C. to 1190 ° C. to 1220 ° C. from the upstream end to the downstream end while passing through the third transfer pipe.
- FIG. 3 shows an example of the third transfer pipe 105c.
- the heater 201 is attached to the outer periphery of the third transfer pipe 105c on the downstream side.
- the heater 201 heats the molten glass flowing in the downstream part of the third transfer pipe 105c by heating the downstream part of the third transfer pipe 105c.
- the temperature control device 202 connected to the heater 201 controls the temperature of the molten glass flowing in the downstream portion of the third transfer pipe 105c by controlling the output of the heater 201.
- the third transfer pipe 105c is preferably made of a refractory metal that can withstand contact with molten glass at a high temperature, and more preferably made of platinum or a platinum alloy.
- the temperature of the molten glass gradually decreases from 1440 ° C. to 1500 ° C. to 1190 ° C. to 1220 ° C. as it flows from the upstream side to the downstream side of the third transfer pipe 105c. Further, on the downstream side of the third transfer pipe 105 c from which the molten glass flows out to the molding apparatus 104, the temperature of the third transfer pipe 105 c is temporarily raised by the heater 201.
- the temperature of the downstream part of the third transfer pipe 105c heated by the heater 201 is higher than the temperature of the third transfer pipe 105c in the vicinity of the upstream side, specifically, preferably 1 ° C. or higher, It is preferably 5 ° C or higher, or more preferably 10 ° C or higher.
- the downstream side is a half downstream from the half of the entire length of the third transfer pipe 105c, and is a portion including the downstream end as close as possible to the downstream end of the third transfer pipe 105c.
- the molten glass passes through a portion heated by the downstream heater 201 over a predetermined time.
- the predetermined time is suitable for the temperature of the third transfer pipe 105c once raised to be sufficient for the temperature of the molten glass in contact with the temperature to rise. This is preferred, and more preferably 2 minutes or longer.
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Abstract
Description
(i)脈理の抑制には、成形装置に供給される溶融ガラスが均質であることが必要であること、
(ii)成形装置に供給される溶融ガラスを均質にするには、供給される溶融ガラスの温度が全体にわたって均一である必要があること、
を見出した。
(1-1)ガラスの原料
本発明に係るガラス板の製造方法は、あらゆるガラス板の製造に適用可能であるが、特に液晶表示装置やプラズマディスプレイ装置などのフラットパネルディスプレイ用のガラス基板、あるいは、表示部を覆うカバーガラスの製造に好適である。
(a)SiO2:50~70質量%、
(b)B2O3:5~18質量%、
(c)Al2O3:10~25質量%、
(d)MgO:0~10質量%、
(e)CaO:0~20質量%、
(f)SrO:0~20質量%、
(o)BaO:0~10質量%、
(p)RO:5~20質量%(但し、Rは、Mg、Ca、SrおよびBaから選ばれる少なくとも1種である)、
(q)R’ 2O:0.10質量%を超え2.0質量%以下(但し、R’は、Li、Na、およびKから選ばれる少なくとも1種である)、
(r)酸化スズ、酸化鉄、および、酸化セリウムなどから選ばれる少なくとも1種の金属酸化物を合計で0.05~1.5質量%。
(a’)SiO2:50~70質量%
(b’)B2O3:1~10質量%
(c’)Al2O3:0~25質量%
(d’)MgO:0~10質量%
(e’)CaO:0~20質量%
(f’)SrO:0~20質量%
(o’)BaO:0~10質量%
(q’)K2O:0~2質量%
(r’)SnO2:0~1質量%
(s’)Fe2O3:0.01~0.045質量%
また、上記の液晶基板用ガラスは、ヒ素およびアンチモンを実質的に含まないことが好ましい。すなわち、これらの物質が含まれるとしても、それは不純物として含まれる。具体的には、これらの物質は、As2O3、および、Sb2O3という酸化物のものも含め、0.1質量%以下であることが好ましい。
本発明の一実施形態に係るガラス板の製造方法は、図1のフローチャートが示す一連の工程を含み、図2が示すガラス板製造ライン100を用いる。
次に供給工程について詳細に説明する。
以下のとおり、実際に本発明にかかるガラス板の製造方法を用いると脈理が低減されたガラス板を製造することができる。
本発明にかかるガラス板の製造方法の上記実施形態では、供給工程(ステップS104)において、溶融ガラスが第3移送管105cの入り口から出口まで流れる間に平均30℃/m以下の割合で、溶融ガラスの温度が150℃以上(例えば、上記の組成を有するフラットパネルディスプレイ用のガラス基板の場合、約240℃~300℃)下げられる。その後、溶融ガラスは、成形装置104に供給される直前で、第3移送管105cの内側に接する界面領域の溶融ガラスの温度よりも高温の第3移送管105cの部位を通され、当該部位の第3移送管105cの熱が第3移送管105cの内側と溶融ガラスとの界面から中心に向かって伝わることにより第3移送管105cの断面方向の溶融ガラスの温度差を減少させる。これにより、溶融ガラスは緩やかに冷却されるとともに、成形装置104に供給される溶融ガラスの温度が全体的に均一になり、脈理を低減することができる。
上記実施形態にかかる供給工程は、以下のようにも変形可能である。
101 溶解槽
102 清澄槽
103 攪拌槽
104 成形装置
105c 第3移送管(移送管)
201 ヒータ
202 温度制御装置
Claims (5)
- 溶融ガラスを移送管(105c)の一端から他端に向かって流して、前記溶融ガラスを成形装置(104)に供給する供給工程、
を含むガラス板の製造方法であって、
前記供給工程において、
前記溶融ガラスの温度を平均30℃/m以下の割合で150℃以上下げた後、
前記溶融ガラスを、前記移送管(105c)の内側に接する界面領域の前記溶融ガラスよりも高い温度の前記移送管(105c)の部位にとおして前記成形装置(104)に供給することを特徴とする、
ガラス板の製造方法。 - 前記供給工程において、
前記溶融ガラスの温度を50℃/m以上の割合で下げた後、
前記溶融ガラスの温度を50℃/mよりも低い割合で下げて、
前記溶融ガラスの温度を下げる割合を平均30℃/m以下にすることを特徴とする、
請求項1に記載のガラス板の製造方法。 - 溶融ガラスを移送管(105c)の一端から他端に向かって温度を下げながら流して、前記溶融ガラスを前記移送管(105c)の前記他端に接続された成形装置(104)に供給する供給工程、
を含むガラス板の製造方法であって、
前記供給工程において、
前記移送管(105c)の断面の中央部における前記溶融ガラスの温度と、前記移送管(105c)の断面の周辺部における前記溶融ガラスの温度との温度差を低減することを特徴とする、
ガラス板の製造方法。 - 前記供給工程において、
前記溶融ガラスの温度を平均30℃/m以下の割合で150℃以上下げることにより、前記移送管(105c)の断面の中央部における前記溶融ガラスの温度と、前記移送管(105c)の断面の周辺部における前記溶融ガラスの温度との温度差を低減することを特徴とする、
請求項3に記載のガラス板の製造方法。 - 前記供給工程において、
前記溶融ガラスの温度を下げた後、前記溶融ガラスを、前記移送管(105c)の内側に接する界面領域の前記溶融ガラスよりも高い温度の前記移送管(105c)の部位にとおして前記成形装置(104)に供給することにより、前記移送管(105c)の断面の中央部における前記溶融ガラスの温度と、前記移送管(105c)の断面の周辺部における前記溶融ガラスの温度との温度差を低減することを特徴とする、
請求項3又は4に記載のガラス板の製造方法。
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