WO2012073624A1 - フロート板ガラスの製造装置およびフロート板ガラスの製造方法 - Google Patents
フロート板ガラスの製造装置およびフロート板ガラスの製造方法 Download PDFInfo
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- WO2012073624A1 WO2012073624A1 PCT/JP2011/074877 JP2011074877W WO2012073624A1 WO 2012073624 A1 WO2012073624 A1 WO 2012073624A1 JP 2011074877 W JP2011074877 W JP 2011074877W WO 2012073624 A1 WO2012073624 A1 WO 2012073624A1
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- Prior art keywords
- building
- glass
- float
- slow cooling
- glass ribbon
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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
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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
- C03B18/16—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
- 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
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- 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
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B33/00—Severing cooled glass
- C03B33/02—Cutting or splitting sheet glass or ribbons; Apparatus or machines therefor
- C03B33/023—Cutting or splitting sheet glass or ribbons; Apparatus or machines therefor the sheet or ribbon being in a horizontal position
- C03B33/0235—Ribbons
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- 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 float plate glass manufacturing apparatus and a float plate glass manufacturing method capable of reducing the cause of surface defects of the float glass sheet and preventing the occurrence of warpage without causing cracks, and enabling stable production. .
- a float glass manufacturing method is widely used as a manufacturing method for architectural glass plates, automotive glass plates, and glass plates for displays.
- the charged glass raw material is melted, and the obtained molten glass passes through the clarification tank 32. It is poured out on the surface of the molten tin layer stored in the float bath 33.
- the molten glass poured out into the float bath 33 is formed into a glass ribbon 34 having a predetermined thickness while moving the surface of the molten tin layer from the upstream side of the higher temperature float bath toward the downstream side of the lower temperature,
- the glass ribbon 34 is taken out from the outlet of the float bath 33, transported to the slow cooling furnace 35, gradually cooled while being transported in the slow cooling furnace 35, and the slowly cooled glass ribbon 34 is pulled out from the slow cooling furnace 35, and then a glass ribbon cutting stage 36 (cutting).
- the apparatus is not shown) and is cut to a predetermined size to form a float glass sheet.
- a glass substrate for a flat display panel such as a liquid crystal display panel, a plasma display panel, or an organic EL display panel is generally about 0.3 mm to 3.0 mm thick.
- a high-precision, high-quality thin glass having excellent flatness and no defects.
- the operating conditions of the production line are strictly controlled, and the surface defects of the glass plate such as dust, dust, foreign matter and substances that cause contamination
- the glass melting tank, the float bath, and the slow cooling furnace are installed in one building so that the resulting material does not adhere to the surface of the glass ribbon, and the molded glass ribbon is designed to flow continuously in the building. Often.
- a long line slow cooling furnace for gradually cooling a glass ribbon includes a heater, and the cooling temperature gradually decreases.
- the glass ribbon which has been carried out of the slow cooling furnace and has become a low temperature is usually cut to a desired size by a glass ribbon cutting stage exposed to the outside air, and the cut glass plate is picked and boxed by the picking stage. .
- a second building having a surrounding structure is installed in series with the outlet of the slow cooling furnace in the building, and the cutting stage and, in some cases, the sampling stage are also the second. Proposals have been made to prevent adhesion of dust, dust, foreign substances, and dirt-causing substances on the glass ribbon surface or on the cut glass plate surface in the cutting stage or later stages, including in buildings. Yes.
- the temperature is about 1000 ° C. to 700 ° C.
- the slow cooling furnace the temperature is about 700 ° C. to 30 ° C. from the upstream side to the downstream side. Therefore, in the building where the glass melting tank, float bath, and slow cooling furnace are installed, the rising airflow generated from the high temperature glass melting furnace etc.
- the level near the floor (a height of 0 to 2 m) where the annealing furnace is installed is in a negative pressure state.
- the negative pressure on the side where the slow cooling furnace is installed results in cooler air on the cutting stage side flowing into the slow cooling furnace from the outlet of the glass ribbon of the slow cooling furnace, and changes in the manufacturing conditions of the glass ribbon, particularly strictly controlled This causes a problem that the slow cooling conditions are varied, and it is difficult to maintain stable production conditions. For example, if the slow cooling conditions are varied, there is a risk that the glass ribbon breaks in the slow cooling furnace, and the produced glass plate is warped or undesirably distorted.
- the publication proposes an invention of an apparatus that significantly reduces the contact between the combustion gas and the glass ribbon surface at the outlet of the float bath.
- the invention described in the publication relates to an improvement in deflecting the flow of the combustion gas flowing out from the outlet of the float bath from the surface of the glass ribbon, and does not mention any problems that occur in the slow cooling furnace. .
- the present invention relates to a cutting stage through a glass ribbon outlet region of a slow cooling furnace due to a pressure difference between a building in which at least a float bath and a slow cooling furnace are installed and an atmosphere in a region of a cutting stage in a downstream process in the float plate glass production.
- Air or cold air (hereinafter also referred to as air or atmosphere gas on the cutting stage side) flows into the slow cooling furnace from the side of the region, and the molten ribbon in the float bath is further transported through the slow cooling furnace.
- An object of the present invention is to provide a float plate glass manufacturing apparatus and a float plate glass manufacturing method in which a glass ribbon flowing on the surface is cooled and a predetermined temperature condition set in advance is prevented from changing.
- the present invention provides: A glass melting tank, a float bath for producing a glass ribbon by flowing molten glass continuously supplied from the glass melting tank on the surface of the molten metal layer, and a slow cooling furnace for gradually cooling the glass ribbon produced by the float bath
- a cutting stage that cuts the glass ribbon that has been slowly cooled in the slow cooling furnace to a predetermined size to produce a float plate glass, and a transport path that transports the glass ribbon prepared in the float bath toward the cutting stage through the slow cooling furnace
- a float sheet glass manufacturing apparatus comprising: A first building surrounding at least the float bath and the slow cooling furnace, The cutting stage is installed outside the first building, Production of float plate glass, wherein a front space region is formed between a side wall provided with the glass ribbon carry-out port of the first building and a side wall provided with the glass ribbon carry-out port of the slow cooling furnace.
- the temperature in the slow cooling furnace can be stably maintained at a predetermined condition set in advance, and the glass ribbon is formed by air flowing from the cutting stage side of the glass ribbon into the slow cooling furnace. Temperature fluctuations can be prevented, and as a result, high-quality and stable quality glass plates, especially glass plates for thin displays, with no defects such as warping and unfavorable distortion, can be stably produced. can do.
- FIG. 1 is a longitudinal sectional explanatory view of a float sheet glass manufacturing apparatus according to one embodiment of the present invention.
- FIG. 2 is a longitudinal cross-sectional explanatory view of a float sheet glass manufacturing apparatus according to another embodiment of the present invention.
- FIG. 3 is an explanatory plan view in the vertical direction of the apparatus for producing float glass according to one embodiment of the present invention.
- FIG. 4 is an explanatory plan view in the vertical direction of a float sheet glass manufacturing apparatus according to another embodiment of the present invention.
- FIG. 5 is an explanatory plan view in the vertical direction of a float sheet glass manufacturing apparatus according to another embodiment of the present invention.
- FIG. 6 is a longitudinal cross-sectional explanatory view of a float sheet glass manufacturing apparatus according to a comparative example of the present invention.
- FIG. 7 is a schematic perspective view of a conventional float glass manufacturing apparatus.
- FIG. 1 and FIG. 2 are longitudinal cross-sectional explanatory views showing a schematic configuration of a float sheet glass manufacturing apparatus according to a preferred embodiment of the present invention.
- the float sheet glass manufacturing apparatus melts and melts a glass raw material.
- the glass ribbon 4 is shown by a solid line, the glass ribbon 4 is shown as flowing in the right direction of the figure at an interval on the molten metal layer 2 in the float bath of FIGS. In practice, the glass ribbon flows in contact with the molten metal surface.
- the glass melting tank 1, the float bath 3, and the slow cooling furnace 7 are installed in one building (hereinafter referred to as the first building 10) that has a surrounding structure with respect to the outside air.
- the cutting stage 8 and the sampling stage 9 are also installed in one building (hereinafter referred to as a second building 11) having a surrounding structure.
- the float bath 3 and the slow cooling furnace 7 are installed in one building (hereinafter referred to as a first building 10) having a surrounding structure with respect to the outside air.
- the sampling stage 9 is not installed in the second building as described above, and exists in an open state exposed to the outside air without enclosure.
- the float bath 3 and the slow cooling furnace 7 are installed in the first building 10, and the cutting stage 8 and the sampling stage 9 are also installed in the second building 11. .
- the glass melting tank 1, the float bath 3, and the slow cooling furnace 7 are installed in the first building 10, and the cutting stage 8 and the sampling stage 9 are the second as described above. It is not installed in the building and exists in an open state exposed to open air without enclosure.
- the first building 10 in the present invention has a structure in which at least the float bath 3 and the slow cooling furnace 7 of the float plate glass manufacturing facility are accommodated, and has a structure, maintenance / maintenance / repair, operation / operation necessary for the manufacture of the float plate glass. Except for the parts necessary for operation, the structure basically includes a side wall, an upper wall, a lower wall / lower shielding member, a front wall, and a rear wall that form a surrounding structure.
- the internal space of the first building 10 is basically partitioned and separated from the internal space of the building where the first building is installed, except for the necessary part, and the internal space of the first building Is designed to reduce the influence of outside air inside the building.
- the structure basically includes a wall, a lower wall / lower shielding member, a front wall, and a rear wall.
- an exhaust hole is provided in the ceiling or upper wall of the building for exhausting air and atmospheric gas in the building.
- the slow cooling furnace 7 in the present invention is continuously installed in the first slow cooling chamber 5 and the first slow cooling chamber 5 each having a heater controlled to slowly cool the glass ribbon 4 carried out from the float bath 3. Moreover, it is preferable that the glass ribbon 4 cooled in the first slow cooling chamber is partitioned into a second slow cooling chamber 6 for further cooling.
- the first slow cooling chamber 5 includes a high-temperature glass ribbon 4 (for example, about 750 ° C. to 850 ° C.) transported from the float bath 3 so that undesirable distortion does not occur in the glass plate to be manufactured.
- the temperature is controlled so that the glass is gradually cooled to a temperature below the strain point of the glass at a predetermined slow cooling rate.
- a heater (not shown) is installed so that a predetermined temperature distribution and temperature gradient can be obtained.
- the glass ribbon 4 cooled to a temperature sufficiently lower than the strain point temperature (for example, about 300 ° C. to 500 ° C.) in the first slow cooling chamber 5 is transferred from the first slow cooling chamber 5 to the second slow cooling chamber. Then, it is cooled to a temperature suitable for cutting the glass ribbon (for example, about 30 ° C. to 100 ° C.).
- the second slow cooling chamber 6 usually does not have a heater in particular, but the second slow cooling chamber is so formed that the temperature in the second slow cooling chamber gradually decreases in the traveling direction of the glass ribbon so as to be further cooled. Temperature distribution and temperature gradient are controlled.
- a plurality of transport rolls 12 for transporting the glass ribbon 4 carried out from the float bath 3 are provided in parallel at a predetermined interval to form a transport path. And this conveyance roll 12 is floated so that the glass ribbon 4 is carried out from the slow cooling furnace 7, it is transferred to the cutting stage 8, and the plate glass cut
- the transport roll is driven by a drive motor (not shown), and a continuous glass ribbon in the form of a ribbon is transported to the cutting stage at a predetermined constant speed on the transport roll.
- a first slow cooling chamber 5 and a second slow cooling chamber 6 are shown in FIGS. 1 and 2.
- the glass ribbon carried out of the float bath may be gradually cooled from a high temperature state and may be gradually cooled to a temperature close to room temperature, with the first and second slow cooling chambers being one continuous chamber structure.
- the slow cooling furnace 7 of the present invention described above is partitioned in the first building part except for the inlet and outlet of the glass ribbon 4, the parts necessary for maintenance / maintenance / repair, operation / operation, and has a surrounding structure.
- the structure basically includes a side wall, an upper wall, a lower wall / lower shielding member, a front wall, and a rear wall. That is, the first slow cooling chamber 5 and the second slow cooling chamber 6 of the slow cooling furnace 7 are installed in these slow cooling chambers from upstream to downstream of the glass ribbon transport roll, on both sides, above the transport roll,
- the room structure is such that the whole, including the lower part, is substantially blocked from the outside air.
- region is formed between the side wall 18 of the both sides of the 1st building 10 in the direction parallel to the advancing direction of the glass ribbon 4 of the slow cooling furnace 7, and the side wall 17 of a slow cooling furnace, Moreover, a 1st building It is preferable that an upper space region is also formed between the ceiling wall 20 and the ceiling wall 19 of the annealing furnace. That is, the slow cooling furnace 7 is provided on the floor of the first building 10 in the central region in the longitudinal direction of the building (that is, the traveling direction of the glass ribbon). The slow cooling furnace 7 is installed at a predetermined distance from the side walls on both sides of the first building 10.
- the internal space of the slow cooling furnace 7 is basically partitioned and separated from the internal space of the first building 10 except for the necessary part, and the internal space of the slow cooling furnace 7 is It is designed to reduce the influence of the atmospheric gas in the first building 10. Further, only the second slow cooling furnace 6 may share the ceiling with the ceiling wall 20 of the building, or provide an attic between the ceiling wall 20 of the building.
- FIGS. 1, 3 and 4 are arranged so as to surround the cutting stage 8 for cutting the glass ribbon 4 carried out from the slow cooling furnace 7 (second slow cooling chamber 6) and to block the outside air.
- Two buildings 11 are installed.
- the second building 11 also has a structure in which the cutting stage 8 is accommodated, and has a surrounding structure except for the structure necessary for the cutting stage 8, maintenance, maintenance, repair, operation and operation.
- the internal space of the second building 11 is basically partitioned and separated from the internal space of the building where the second building is installed, except for the necessary parts. Designed to reduce the influence of outside air inside the object.
- the second building 11 may include a subsequent sampling stage of the cutting stage, or may further include a processing stage after the sampling stage.
- the cutting stage, further the sampling stage, etc. are partitioned from the outside air and are blocked from the outside air. Inflow to the plate stage can be prevented, and as a result, dust, contaminants, etc. can be prevented from falling and adhering to the surface of the glass ribbon flowing in the slow cooling furnace 7. The cause of the defect can be reduced.
- the second stage 11 is not installed, and the cutting stage 8, the cutting stage and the subsequent sampling stage 9 are enclosed. It may be present in an open state exposed to no outside air.
- a front exit side wall 13 is erected, and a carry-out port 14 through which the glass ribbon 4 is carried out is formed on the front exit side wall 13 of the first building.
- a front outlet side wall 15 is erected at the end of the slow cooling furnace 7, that is, the second slow cooling chamber 6, on the side where the glass ribbon 4 transferred in the direction of arrow A is unloaded from the slow cooling chamber 6.
- the exit side wall 15 in front of the slow cooling furnace is formed with a carry-out port 16 through which the glass ribbon 4 is carried out.
- the outlets 14 and 16 of the front outlet side wall 13 and the front outlet side wall 15 are openings of an appropriate size for the glass ribbon 4 to be carried out from the first building 10 and from the slow cooling furnace 7. .
- it is designed to have a width and height so that excess air does not flow from the carry-out port 14 into the first building 11 and from the carry-out port 16 into the slow cooling furnace 7.
- the glass ribbon 4 transferred to the arrow A direction of the 2nd building 11 is the said 2nd building 11 concerned.
- a rear entrance side wall is erected at an end portion on the side where the glass ribbon is carried in, and a carry-in port into which the glass ribbon 4 is carried is formed on the entrance side wall of the second building.
- FIG. 6 an inlet side wall at the rear of the second building is shown as 21, and a carry-in entrance provided in the inlet side wall 21 is shown as 22.
- the outlet side wall 13 of the first building 10 may be shared as the inlet side wall of the second building 11.
- the outlet side wall 13 of the first building 10 and the inlet side wall of the second building 11 are formed separately, and the front outlet side wall 13 and the inlet side wall of the second building 11 are connected in series. It is good.
- the 1st building 10 and the 2nd building 11 are installed closely, and the inflow of the external air from the clearance gap between the exit side wall 13 of the 1st building and the entrance side wall of the 1st building 11 is predetermined. It is good also as a structure which has some gaps which become the following.
- the front exit side wall of the first building 10 has various modes, and the front exit side wall serves as a partition wall that partitions the cutting stage side of the first building 10. Therefore, hereinafter, the outlet side wall in front of the first building 10 is also referred to as a partition wall in the present invention, including the case where it is shared with the inlet side wall of the second building 11.
- the outlet side wall 13 in front of the first building 10, that is, the partition wall that forms a partition with the cutting stage side, is installed at a predetermined interval from the outlet side wall 15 on the carry-out side of the glass ribbon 4 of the slow cooling furnace 7.
- a front space region is formed between the front outlet side wall 13 and the partition wall.
- Such a front space region allows the outside air or the atmospheric gas flowing into the first building 10 from the cutting stage side or from the second building 11 through the carry-out port 14 of the first building 10 to pass through the slow cooling furnace 7.
- the side space area between the side wall in the longitudinal direction of the first building and the side wall in the longitudinal direction of the first building is a space that wraps around in the direction opposite to the traveling direction of the glass ribbon.
- Cold air) or atmospheric gas (air, cold air) in the second building can be reduced from entering the inside of the slow cooling furnace 7 through the outlet 16 of the second slow cooling chamber of the slow cooling furnace 7.
- L is the second slow cooling furnace of the partition wall which is the outer surface of the outlet side wall 15 in front of the slow cooling furnace 7, that is, the first slow cooling chamber 6, and the outlet side wall 13 in front of the first building 10.
- 6 is the distance between the inner surface and the first building 10, the slow cooling furnace 6, and further depending on the size of the float bath 3, but according to a normal float plate glass manufacturing apparatus, preferably 0.5 m or more It is. This distance shows the average of the distance in the arrow A direction between the outer surface of the exit side wall 15 of the 2nd slow cooling chamber 6 and the inner surface of the partition wall which is the exit side wall 13 of the 1st building 11. .
- this distance is 0.5 m or more, a sufficient front space region is formed between the outlet side wall 13 of the first building 11 and the partition wall, and external air from the cutting stage side or the second building 11 is formed.
- the ambient gas in the building from the side flows from the outlet side wall 13 in front of the first building 10, that is, the partition wall carry-out port 14, or the ambient gas is the slow cooling furnace 7, that is, the second slow cooling chamber 6.
- the amount of the glass ribbon flowing into the second annealing chamber 6 from the carry-out port 16 can be reduced.
- the upper limit of the distance is not particularly limited, but is preferably 30.0 m or less from the viewpoint of device design and practical use.
- the cross-sectional area of the front space region between the outlet side wall 13 of the second building 10 and the outlet side wall 15 of the second annealing chamber 6 is the outlet side wall 13 of the second building 10, that is, the outlet of the partition wall. It is preferable that it is at least twice or more than 14 cross-sectional areas.
- the distance L between the outer surface of the outlet side wall 15 of the slow cooling chamber 6 and the inner surface of the partition wall that is the outlet side wall 13 of the first building 10 on the side of the slow cooling furnace 6 is as described above.
- the air flowing into the inner side from the carry-out port 14 of the outlet side wall 13 in front of the first building 10 is moved in the longitudinal direction of the slow cooling furnace 7 and the longitudinal direction of the first building. It can be made to wrap around in the side space region between the side walls and in the direction opposite to the direction of travel of the glass ribbon, and the second slow cooling chamber 6 from the glass ribbon outlet 14 of the second slow cooling chamber 6. The amount flowing into the first slow cooling chamber 5 can be reduced.
- the air flowing from the outlet 14 of the outlet side wall 13 in front of the first building 10 is made of glass ribbon.
- Sufficient width and length are required to flow in the direction opposite to the traveling direction (the direction of arrow C).
- the distance between the outer surface of the side wall 17 in the longitudinal direction of the slow cooling furnace 7 and the inner surface of the side wall 18 in the longitudinal direction of the first building 10 is 2.0 m or more over the entire length of the slow cooling furnace 7. is there.
- a distance shows the distance of the shortest part between both.
- the partition wall in the above example has a one-stage configuration, but may be two or more stages at a predetermined interval as necessary.
- another partition wall or a plurality of partition walls may be provided between the outlet side wall 13 of the second building 10 and the outlet side wall 15 of the second annealing chamber 6.
- Such a partition wall partially covers an upper region of the space between the outlet side wall 13 of the second building 10 and the outlet side wall 15 of the second annealing chamber 6 and / or a predetermined region of both side regions. It may be.
- the outlet side wall 15 of the slow cooling furnace 7, that is, the second slow cooling chamber 6, and the outlet side wall 13 of the first building 10, that is, the partition wall have a predetermined interval.
- the outside air air, cold air
- the second building From the glass ribbon carry-in port 22 on the entrance side wall 21 to the first building 10 through the carry-out port 14 on the exit side wall 13 on the first building 10 and the carry-out port 16 on the second annealing chamber 6, the second The air at a low temperature in the building 11 (for example, cold air of about 4 to 10 ° C.) directly enters the second annealing chamber 6 as indicated by the arrow D, and further enters the first annealing chamber 5. End up.
- a low temperature in the building 11 for example, cold air of about 4 to 10 ° C.
- the inflowing cold air fluctuates the preset slow cooling conditions of the second slow cooling chamber 6 and the first slow cooling chamber 5, and the desired slow cooling is not performed, and the glass ribbon is cracked. Warp and undesired non-uniform distortion occur, making it impossible to produce a high-quality float plate glass with stable quality.
- dust, contaminants, etc. that are generated at the cutting stage of the second building 11, further at the sampling stage, etc., or that flow in with these stages flow into the slow cooling furnace 7 and flow through the slow cooling furnace 7.
- dust, contaminants, etc. once fall on the surface of the ribbon and cause the surface defects of the float glass.
- the pressure in the first building 10 (more specifically, the front space region, the side space region, and / or the upper space region) is applied to the second building. It is preferable to control to a negative pressure compared with the pressure in 11. Specifically, the pressure in the first building 10 is preferably set lower by about 0.1 Pa to 30.0 Pa than the pressure in the second building 11.
- the air that has flowed into the first building 10 from the second building 11 through the gap between the glass ribbon 4 of the glass ribbon transport port 14 of the first building In the front space area in one building 10, it flows in the direction of the side space area between the longitudinal side wall 16 of the first building 10 and the longitudinal side wall 17 of the slow cooling furnace 7 (arrow B direction). It is possible to control the air so as to flow in the direction (C direction) opposite to the traveling direction of the glass ribbon 4 through the side space region.
- molded from the float bath and carried out is passed through the said slow cooling furnace, is slowly cooled, is taken out from the 1st building 10, and is in the 2nd building 11
- the glass ribbon is cut at the cutting stage of, to produce a desired float plate glass.
- the inside of the first building 10 (more specifically, the front space region, the side space region) Or / and the upper space region) is preferably controlled to a negative pressure with respect to the external atmospheric pressure.
- the pressure in the first building 10 it is preferable to set the pressure in the first building 10 to be lower by about 0.1 Pa to 30.0 Pa than the pressure of the ambient air as described above.
- the air of the outside air that has flowed into the building 10 through the gap portion between the glass ribbon 4 of the transport opening 14 portion of the glass ribbon of the first building In the front space area, it can be controlled to flow in the direction of arrow B, and the air that has flowed in can flow in the direction of arrow C through the side space area.
- molded and carried out from the float bath was passed through the said slow cooling furnace, and it cooled slowly, and it carried out from the 1st building 10 and carried out the glass ribbon with the cutting stage. Cut to produce the desired float glass.
- the present invention it is possible to stably produce a high-precision, high-quality thin plate glass having a small surface defect, low warpage and stress distribution, and an FPD glass substrate, particularly a liquid crystal display. It is suitable for producing a glass substrate having a panel thickness of 0.3 to 1.0 mm.
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- Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
Abstract
Description
ガラス溶融槽と、該ガラス溶融槽から連続的に供給される溶融ガラスを溶融金属層面上で流動させてガラスリボンを作製するフロート浴と、該フロート浴で作製されたガラスリボンを徐冷する徐冷炉と、該徐冷炉で徐冷されたガラスリボンを所定寸法に切断しフロート板ガラスを製造する切断ステージと、前記フロート浴で作製されたガラスリボンを前記徐冷炉を通して前記切断ステージに向けて搬送する搬送路とを備えるフロート板ガラス製造装置において、
少なくとも前記フロート浴および前記徐冷炉を囲む第1の建屋をさらに備え、
前記切断ステージは前記第1の建屋の外部に設置されており、
前記第1の建屋のガラスリボン搬出口が設けられる側壁と、前記徐冷炉のガラスリボン搬出口が設けられる側壁との間には、前方空間領域が形成されていることを特徴とするフロート板ガラスの製造装置を提供する。
本出願は、2010年11月29日出願の日本特許出願2010-265620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。
2:溶融金属層
3:フロート浴
4:ガラスリボン
5:第1の徐冷室
6:第2の徐冷室
7:徐冷炉
8:切断ステージ
9:採板ステージ
10:第1の建屋
11:第2の建屋
12:搬送ロール
13:第1の建屋の出口側壁(第1の建屋のガラスリボン搬出口が設けられる側壁)
14:第1の建屋の出口側壁の搬出口
15:徐冷炉の出口側壁(徐冷炉のガラスリボン搬出口が設けられる側壁)
16:徐冷炉の出口側壁の搬出口
17:徐冷炉の側壁
18:第1の建屋の側壁
19:徐冷炉の天井壁
20:第1の建屋の天井壁
21:第2の建屋の入口壁
22:第2の建屋の搬入口
Claims (12)
- ガラス溶融槽と、該ガラス溶融槽から連続的に供給される溶融ガラスを溶融金属層面上で流動させてガラスリボンを作製するフロート浴と、該フロート浴で作製されたガラスリボンを徐冷する徐冷炉と、該徐冷炉で徐冷されたガラスリボンを所定寸法に切断しフロート板ガラスを製造する切断ステージと、前記フロート浴で作製されたガラスリボンを前記徐冷炉を通して前記切断ステージに向けて搬送する搬送路とを備えるフロート板ガラスの製造装置において、
少なくとも前記フロート浴および前記徐冷炉を囲む第1の建屋をさらに備え、
前記切断ステージは前記第1の建屋の外部に設置されており、
前記第1の建屋のガラスリボン搬出口が設けられる側壁と、前記徐冷炉のガラスリボン搬出口が設けられる側壁との間には、前方空間領域が形成されていることを特徴とするフロート板ガラスの製造装置。 - 前記第1の建屋のガラスリボン搬出口が設けられる側壁と、前記徐冷炉のガラスリボン搬出口が設けられる側壁との間の距離が0.5m以上である請求項1に記載のフロート板ガラスの製造装置。
- 前記第1の建屋の長手方向の側壁と、前記フロート浴および前記徐冷炉の長手方向の側壁との間には側部空間領域が形成されており、
前記第1の建屋のガラスリボン搬出口から前記第1の建屋内に流入した空気は、前記前方空間領域を通って前記側部空間領域に至り、ガラスリボンの進行方向とは反対方向に流れる請求項1または2に記載のフロート板ガラスの製造装置。 - 前記第1の建屋の外部に設けられ、前記切断ステージを囲む第2の建屋をさらに備える請求項1~3のいずれか1項に記載のフロート板ガラスの製造装置。
- 前記徐冷炉は、前記フロート浴から搬出されたガラスリボンをガラスの歪点以下の温度まで徐々に冷却すべく制御されたヒータを備えた第1の徐冷室と、該第1の徐冷室で冷却されたガラスリボンを更に冷却する第2の徐冷室とに区画されている請求項1~4のいずれか1項に記載のフロート板ガラスの製造装置。
- 前記ガラス溶融槽は、前記第1の建屋内に設置されている請求項1~5のいずれか1項に記載のフロート板ガラスの製造装置。
- 前記第1の建屋内の圧力は、前記切断ステージ側の雰囲気の圧力よりも低く設定されている請求項1~6のいずれか1項に記載のフロート板ガラスの製造装置。
- 前記第1の建屋内の圧力は、前記切断ステージ側の雰囲気の圧力よりも0.1Pa~30.0Pa低く設定されている請求項1~7のいずれか1項にフロート板ガラスの製造装置。
- 前記第1の建屋内の圧力は、前記第2の建屋内の圧力よりも0.1Pa~30.0Pa低く設定されている請求項4に記載のフロート板ガラスの製造装置。
- 請求項1に記載のフロート板ガラスの製造装置によりフロート板ガラスを製造するフロート板ガラスの製造方法において、
前記切断ステージ側から前記第1の建屋のガラスリボン搬出口を通って前記第1の建屋内に流入した空気は、前記前方空間領域を通り、さらに前記第1の建屋内において前記第1の建屋の長手方向の側壁と、前記フロート浴および前記徐冷炉の長手方向の側壁との間の側部空間領域を通ってガラスリボンの進行方向とは反対方向に流れるフロート板ガラスの製造方法。 - 前記第1の建屋内の圧力は、前記切断ステージ側の雰囲気の圧力よりも低く設定されている請求項10に記載のフロート板ガラスの製造方法。
- 前記第1の建屋内の圧力は、前記切断ステージ側の雰囲気の圧力よりも0.1Pa~30.0Pa低く設定されている請求項11に記載のフロート板ガラスの製造方法。
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JP2022542479A (ja) * | 2020-06-08 | 2022-10-03 | 蚌埠中光▲電▼科技有限公司 | 高世代tft-lcdガラス基板生産ライン |
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KR102166471B1 (ko) * | 2017-09-20 | 2020-10-16 | 주식회사 엘지화학 | 유리 기판의 제조 방법 및 제조 장치 |
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CN104797539B (zh) * | 2012-12-28 | 2017-07-07 | 旭硝子株式会社 | 缓冷装置、缓冷方法、玻璃板的制造装置、及玻璃板的制造方法 |
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