CN104640818A - Device and method for producing float glass - Google Patents
Device and method for producing float glass Download PDFInfo
- Publication number
- CN104640818A CN104640818A CN201380048806.1A CN201380048806A CN104640818A CN 104640818 A CN104640818 A CN 104640818A CN 201380048806 A CN201380048806 A CN 201380048806A CN 104640818 A CN104640818 A CN 104640818A
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- Prior art keywords
- sidewall
- glass
- float
- float bath
- feed path
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Classifications
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
- C03B5/26—Outlets, e.g. drains, siphons; Overflows, e.g. for supplying the float tank, tweels
- C03B5/265—Overflows; Lips; Tweels
- C03B5/267—Overflows; Lips; Tweels specially adapted for supplying the float tank
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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
- C03B18/20—Composition of the atmosphere above the float bath; Treating or purifying the atmosphere above the float bath
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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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Glass Compositions (AREA)
- Furnace Details (AREA)
Abstract
The purpose of the present invention is to provide a device and a method for producing float glass with which high-quality glass with few defects can be obtained. This device for producing float glass supplies molten glass to a float bath via a supply path and a spout part, and forms the molten glass into a glass ribbon, the device being characterized in that: the supply path, the spout part, and an entrance part of the float bath are each made by combining a plurality of heat-resistant materials; a cover body is installed so as to cover the spout part, the entrance part of the float bath, and the front end part of the supply path, said front end part being made of a heat-resistant material, said cover body comprising a first side wall that includes an opening surrounding the front end part of the supply path, a second side wall that includes an opening surrounding the entrance part of the float bath and that is arranged in opposition to the first side wall, third and fourth side walls that are located on the outer sides of the spout part and that connect the first and second side walls, and a ceiling wall that is connected to said side walls; and a blow opening for blowing in a non-oxidizing gas is formed in the side wall(s) of the cover body.
Description
Technical field
The present invention relates to manufacturing installation and the manufacture method of float glass.
Background technology
The manufacture method of float glass is such method: be supplied to by melten glass on the surface of the molten tin being stored in float bath continuously, multiple well heater is utilized to heat melten glass, and this melten glass is flowed in the prescribed direction along the surface of molten metal, thus makes this melten glass be configured as desired width, expect that the glass of band plate-like of thickness brings manufacture sheet glass.Just proposed there is such scheme: adopt float forming in the past, productivity is higher, and can the excellent sheet glass of production Flatness, be therefore such as widely used in the manufacture etc. of panel for construction glass, panel substrate glass, to seek to improve the glass quality obtained.
As an example of the manufacture method of float glass, there will be a known such technology: be blown into nitrogen to by melten glass and two in the space (regulating part space) that regulates the regulating part (Japanese: ト ウ ィ Le) supplying the flow of the melten glass come from smelting furnace and formed, the pressure in this regulating part space is kept than the pressure high (with reference to patent documentation 1) of interval, the i.e. runner exit (Japanese: ス パ ウ ト) till from regulating part to float bath.
By giving this pressure difference, can prevent the tin steam flowing into runner exit from float bath from flowing into regulating part space.Further, the cassiterite (SnO that can prevent tin steam and oxygen from reacting and generating
2) crystal is attached to regulating part as movable part.In addition, if cassiterite crystal falls and is attached to molten glass surface, then glass is likely caused to occur flaw.For the dropping of this cassiterite crystal, there will be a known the oxide particle that external diameter is the black of several about 10 μm.
In addition, in order to tackle the further high-quality of glass, propose such technology: tin vapor concentration, hydrogen concentration in adjustment runner exit atmosphere, and adjustment is to the nitrogen amount etc. of runner exit supply, suppress to generate cassiterite crystal (with reference to patent documentation 2) because tin steam and oxygen react.
prior art document
patent documentation
Patent documentation 1: Japanese Unexamined Patent Publication 7-109130 publication
Patent documentation 2: public table WO2010/013575 publication again
Summary of the invention
the problem that invention will solve
In recent years, along with the maximization of indicating meter, and require that display quality improves further, stabilization, for the glass substrate for indicating meter, require to suppress flaw etc. to improve quality further.Therefore, for indicating meter glass, require to prevent from generating cassiterite crystal and the flaw suppressing to occur falling along with cassiterite crystal and produce.
Inquire into float bath and this two-part structure of runner exit within this context, float bath and runner exit are complicated structure, that is: float bath and runner exit are separated by antetheca, i.e. front lintel, be configured with melten glass inflow lip at the bottom side of runner exit, and be provided with interception regulating part (Japanese: Star イ ー Le) at the upstream side of lip.These parts, by heat-resisting for brick etc. material combination being formed, have resistance to air loss to a certain degree, but the moving part of regulating part needs gap etc. and there is many gaps, does not therefore become the structure that can control completely from External leakage.
In addition, the seam portion of heat-resisting material utilizes sealing material to carry out gap landfill, but easily there is crackle in the sealing material of glass system, be full of cracks is easily there is in the sealing material of cement system when drying, the sealing material such as water glass are also there will be many holes when drying, therefore exist and cannot realize completely leaking the problem prevented.
Therefore, even if, runner exit inner at float bath is inner be filled with nitrogen, hydrogen and realize control climate, but has little air from arranging environment and be mixed into, therefore not easily suppress to occur described cassiterite crystal.Such as, for this production unit, according to the research of the present inventor, there is such problem: the oxygen being sometimes mixed into about 1000ppm ~ 2000ppm in the part of runner exit, this part oxygen and tin steam react, and generating described cassiterite crystal, this cassiterite crystal drops on melten glass, and causes glass to occur flaw.
Based on described background, the object of the present inventor is to provide a kind of suppression produce tin-oxide at the portion for melten glass inflow of float bath thus can obtain manufacturing installation and the manufacture method of the float glass of the glass of the less high-quality of flaw.
for the scheme of dealing with problems
The manufacturing installation of float glass of the present invention is used for the melten glass come from smelting furnace supply to be supplied to float bath via feed path and runner exit portion, and make this melten glass along be stored in this float bath molten tin surface flow and be configured as the glass ribbon of band plate-like, the feature of the manufacturing installation of this float glass is, described feed path, described runner exit portion and described float bath inlet portion are formed by combining multiple heat-resisting material respectively, there is the 1st sidewall, 2nd sidewall, 3rd sidewall, the lid main body of the 4th sidewall and roof is to cover described feed path leading section, the mode of described runner exit portion and described float bath inlet portion is arranged, the mouth blown of non-oxidizing gas is formed at the sidewall of described lid main body, described 1st sidewall has opening portion, this opening portion surrounds the feed path leading section be made up of described heat-resisting material, described 2nd sidewall is configured to relative with described 1st sidewall, and there is opening portion, this opening portion surrounds the inlet portion of the float bath be made up of described heat-resisting material, described 3rd sidewall, described 4th sidewall is positioned at the outside in described runner exit portion, described 1st sidewall and described 2nd sidewall are coupled together, described roof is connected with these sidewalls.
Non-oxidizing gas is imported, around the leading section that non-oxidizing gas can be utilized to cover melten glass feed path, around runner exit portion and around the inlet portion of float bath by the inside to lid main body.This three part of inlet portion of the leading section of melten glass feed path, runner exit portion and float bath combines the complex structure of heat-resisting material, therefore will inevitably leak, and the atmosphere gas arranging environment enters from the surrounding of these parts.At this, if be filled with non-oxidizing gas all the time in the inside of lid main body, even if the atmosphere gas then arranged in environment from the leading section of melten glass feed path, the leak of this three part of inlet portion of runner exit portion and float bath divides and enters, also owing to being that non-oxidizing gas enters their are inner, oxygen enters ratio less thus tin steam and the probability that oxygen reacts is less.Thus, the possibility generated as the cassiterite crystal of tin-oxide is less, cassiterite crystal growth and the possibility of coarsening is also less, and the possibility that the grower of cassiterite crystal drops on glass ribbon is also less.Therefore, it is possible to obtain the glass ribbon of the less high-quality of flaw, thus can the sheet glass of production high-quality.
In the present invention, can for such structure: be provided with the diaphragm seal in heat-resisting material described in landfill and the gap between the inner peripheral of described opening portion at the opening portion inner peripheral of described 1st sidewall and the opening portion inner peripheral of described 2nd sidewall in the mode of pasting.
By arranging diaphragm seal at the inner peripheral in sidewall opening portion, each sidewall of lid main body is covered around the leading section of melten glass feed path, around runner exit portion and around the inlet portion of float bath, therefore, it is possible to suppress oxygen to enter lid body interior side with higher adaptation.Therefore, in the inner side of the leading section of melten glass feed path, the inner side of the inner side in runner exit portion and the inlet portion of float bath makes the possibility of tin vapor-phase oxidation less, thus can provide and there will not be because of the generation of cassiterite crystal and growth and the glass ribbon of the high-quality of the defect produced.
In the present invention, can be such structure: described lid main body is made up of framing member and the board member integrated with this framing member, this framing member is metal, and arrange along the periphery of described sidewall and the periphery of described roof, described board member forms described sidewall and described roof.
If the lid main body be made up of board member and metal framing member, then assembling is simple and can be widely used in the glass ribbon manufacturing installation of various size.Further, the resistance to air loss of lid main body can be made good.
In the present invention, also such structure can be adopted: the mouth blown of described non-oxidizing gas is formed in the left and right sides of described 1st sidewall bottom.
By the mouth blown of non-oxidizing gas being located at the both sides of sidewall bottom, when being blown into non-oxidizing gas to the inside of lid main body, balance can import this air-flow from left and right well, and around the leading section that this air-flow can not be made directly to blow to melten glass feed path, around runner exit portion and around the inlet portion of float bath.Therefore, it is possible to suppress the private side to lid main body to be involved in the such resultant turbulence of air, thus non-oxidizing gas can be utilized to be full of lid body interior.Therefore, even if wait because leaking and make the gas of lid body interior flow into the inner side of the inner side of the leading section of melten glass feed path, the inner side in runner exit portion and the inlet portion of float bath, the gas entered because of leakage also can be made to be the non-oxidizing gas of the generation not participating in cassiterite crystal.
In the present invention, it can be such structure: regulating part (Japanese: Off ロ Application ト ツ イ ー Le) before the feed path leading section of described melten glass is provided with, this front regulating part carries out flow adjustment for a part of tackling at the melten glass of this feed path internal flow to melten glass, and described 1st sidewall is arranged on the position of setting position by upstream side of regulating part more front than this.
Front regulating part inserts the leading section of the feed path of melten glass and contacts with melten glass, and adjusts the flowing of melten glass, before the feed path front of melten glass, be therefore formed with many parts that can occur to leak around regulating part.By utilizing lid main body reliably to cover the more part of this leakage, the structure that can not import oxygen to the side, feed path leading section of melten glass can be provided.
In the present invention, also can adopt such structure: lintel before the inlet portion of described float bath is provided with, described 2nd sidewall is set as and surrounds around this front lintel.
Also more complicated at the structure at the inlet portion side place of float bath, be therefore formed with the part that many seams from heat-resisting material etc. are leaked.By utilizing lid main body reliably to cover the more part of this leakage, the structure that can not import oxygen to the inlet portion side of float bath can be realized.
The manufacture method of float glass of the present invention is used for the melten glass come from smelting furnace supply to be supplied to float bath via feed path and runner exit portion, and make this melten glass along be stored in this float bath molten tin surface flow and be configured as the glass ribbon of band plate-like, wherein, the lid main body be made up of sidewall and roof is utilized to cover the feed path leading section be made up of heat-resisting material, runner exit portion and float bath inlet portion, under the state that the inside of this lid main body is filled with non-oxidizing gas, described melten glass is supplied to described float bath and molding glass band via described feed path and runner exit portion.
Non-oxidizing gas is imported, around the leading section that non-oxidizing gas can be utilized to cover melten glass feed path, around runner exit portion and around the inlet portion of float bath by the inside to lid main body.This three part of inlet portion of the leading section of melten glass feed path, runner exit portion and float bath is complicated structure, therefore will inevitably leak, and atmosphere gas enters from the surrounding of these parts.
At this, if be filled with non-oxidizing gas all the time in the inside of lid main body, even if atmosphere gas then around from the leading section of melten glass feed path, the leak of this three part of inlet portion of runner exit portion and float bath divides and enters, also owing to being that only non-oxidizing gas enters their are inner, oxygen enters ratio less thus tin steam and the probability that oxygen reacts is less.Thus, can not generate the cassiterite crystal as tin-oxide, the possibility of cassiterite crystal growth is less, and the possibility that the grower of cassiterite crystal drops on glass ribbon is also less.Therefore, it is possible to obtain the glass ribbon of the less high-quality of flaw.
In the present invention, can use lid main body, this lid main body is made up of such as lower part, that is: the 1st sidewall, and it has opening portion, and this opening portion surrounds the feed path leading section be made up of described heat-resisting material; 2nd sidewall, it is configured to relative with described 1st sidewall, and has opening portion, and this opening portion surrounds the inlet portion of the float bath be made up of described heat-resisting material; 3rd sidewall, the 4th sidewall, it is positioned at the outside in described runner exit portion, described 1st sidewall and described 2nd sidewall is coupled together; And roof, it is connected with these sidewalls.
By adopt utilize each sidewall and roof to surround the surrounding of feed path leading section, float bath inlet portion around and the lid main body of structure around runner exit portion, a kind of structure that reliably can cover these portion can be provided.
In the present invention, also the diaphragm seal in heat-resisting material described in landfill and the gap between the inner peripheral of described opening portion can be provided with at the opening portion inner peripheral of the opening portion inner peripheral of described 1st sidewall and described 2nd sidewall in the mode of pasting.
By arranging diaphragm seal at the inner peripheral in sidewall opening portion, each sidewall of lid main body is covered around the leading section of melten glass feed path, around runner exit portion and around the inlet portion of float bath, therefore, it is possible to suppress oxygen to enter lid body interior side with good adaptation.Therefore, in the inner side of the leading section of melten glass feed path, the inner side of the inner side in runner exit portion and the inlet portion of float bath makes the possibility of tin vapor-phase oxidation less, thus can provide and there will not be because of the generation of cassiterite crystal and growth and the glass ribbon of the high-quality of the defect produced.
In the present invention, Neng Goushi, is formed in the left and right sides of described 1st sidewall bottom, and can be blown into non-oxidizing gas equably from the mouth blown of both sides by the mouth blown of described non-oxidizing gas.
The mouth blown of non-oxidizing gas is located at the both sides of sidewall bottom, non-oxidizing gas is blown into the inside of lid main body equably from these both sides, thus balance can import non-oxidizing gas from left and right well, and around the leading section that this air-flow can not be made directly to blow to melten glass feed path, around runner exit portion and around the inlet portion of float bath.Therefore, it is possible to suppress the private side to lid main body to be involved in the such resultant turbulence of air, thus non-oxidizing gas can be utilized to be full of lid body interior.Therefore, even if wait because leaking and make the gas of lid body interior flow into the inner side of the inner side of the leading section of melten glass feed path, the inner side in runner exit portion and the inlet portion of float bath, the gas entered because of leakage also can be made to be the non-oxidizing gas of the generation not participating in cassiterite crystal.
In the present invention, the inside of described lid main body can be full of non-oxidizing gas, make the oxygen concn of described lid body interior be less than 0.3%.
If the oxygen concn of lid body interior is less than 0.3%, then the flaw occurred because of cassiterite crystal of the ribbon surfaces of manufacture can be made extremely few.
the effect of invention
Adopt the present invention, import non-oxidizing gas by the inside to lid main body, around the leading section that non-oxidizing gas can be utilized to cover melten glass feed path, around runner exit portion and around the inlet portion of float bath.This three part of inlet portion of the leading section of melten glass feed path, runner exit portion and float bath is complicated structure, therefore will inevitably leak, and arranges the atmosphere gas in environment and enter from the surrounding of these parts.At this, if be filled with non-oxidizing gas all the time in the inside of lid main body, even if then arrange the atmosphere gas of environment from the leading section of melten glass feed path, the leak of this three part of inlet portion of runner exit portion and float bath divides and enters, also owing to being that non-oxidizing gas enters their are inner, oxygen enters ratio less thus tin steam and the probability that oxygen reacts is less.Thus, the possibility generated as the cassiterite crystal of tin-oxide is less, cassiterite crystal growth and the possibility of coarsening is also less, and the possibility that the grower of cassiterite crystal drops on glass ribbon is also less.Therefore, it is possible to obtain the glass ribbon of the less high-quality of flaw, thus can the sheet glass of production high-quality.
Accompanying drawing explanation
Fig. 1 is the structure iron of float glass manufacturing device comprising melten glass supply road, runner exit portion and float bath of the first embodiment of the present invention.
Fig. 2 is the stereographic map of the installment state representing the lid main body being located at this float glass manufacturing device.
Fig. 3 is the structure iron of this lid main body.
Embodiment
Hereinafter, with reference to the accompanying drawings of an embodiment of the manufacturing installation of float glass of the present invention, but the present invention is not limited to the following embodiment that will illustrate.
As shown in Figure 1, the manufacturing installation 1 of the float glass of present embodiment is configured to such device: make from smelting furnace 2 via the feed path 3 of melten glass and flow through be supplied to float bath 6 on lip 5 melten glass G along the surface flow of molten tin 7 filled in float bath 6 glass ribbon 8 of the band plate-like that is shaped.By glass ribbon 8 from after the export department of float bath 6 takes out, utilize not shown annealing furnace (annealing furnace) to cool this glass ribbon 8, after to the cleaning of this glass ribbon 8, this glass ribbon 8 cut into specified dimension.
In feed path 3, combine the heat-resisting materials such as polylith refractory brick in path shape and form stream 10 elongated in the horizontal direction, the inner side of preposition piece of (Japanese: Off ロ Application ト Block ロ ッ Network) 11 of hollow of the leading section being located at feed path 3 is provided with lip 5, and this lip 5 has and goes and inclined-plane 5a thinning gradually along with towards top.Be provided with top 3A at feed path 3, top 3A constructs the antetheca 12 of cooling.Front regulating part 15 and rear regulating part (Japanese: バ ッ Network Star イ ー Le) 16 utilize not shown lifting appliance to hang the side, leading section at feed path 3 in mode freely up and down.Front regulating part 15 is set to vertically run through the through hole of the part of the front end of the close feed path 3 being formed at top 3A.This front regulating part 15 utilizes lifting appliance to move up and down, and can adjust the ratio of the stream 10 blocked in feed path, thus can regulate the amount of the melten glass G of flowing on lip 5.Control the melten glass G after flow by front regulating part 15 and be supplied to float bath 6 from the front end of lip 5.
There is in the below of lip 5 the inlet portion 6A of float bath 6, utilize the end wall 6a of float bath 6 to support lip 5.Lintel 17 before the inlet portion of float bath 6 is provided with, is configured to: the melten glass G flowed into from lip 5 at the front effluent of front lintel 17 in molten tin 7.
In the device of present embodiment, by by the float bath 6 below the front surface of front lintel 17, this front lintel 17, be located at front lintel 17 side, front, region that the part being provided with lip 5 of the front of feed path 3 and front regulating part 15 surround is called runner exit portion 21.The top in this runner exit portion 21 is covered by the heat-resisting material 22 arranged in the mode of the top 3A extending feed path 3, and the part of the side in runner exit portion 21 is also covered by not shown heat-resisting material, the bottom side in runner exit portion 21 is set to bottom and is covered by the inlet portion 6A of float bath 6, and therefore runner exit portion 21 becomes the accurate enclosed space surrounded by described component.
In the present embodiment, lid main body 25 is provided with to cover the front of described feed path 3, part towards lip 5, runner exit portion 21, the part of inlet portion 6A of float bath 6 and the mode of the toe lateral of front lintel 17.
Lid main body 25 is formed as box like by framing member 25A and multiple board member 25B, this framing member 25A is by being assembled into rectangular box-like forming by metal framework material, the plurality of board member 25B is metal, forms wall portion by embedding the inner side of this framing member 25A.In lid main body 25, utilize the board member 25B being arranged on the front of feed path 3 to form the 1st sidewall 25a, utilize the board member 25B being arranged on front lintel 17 side to form the 2nd sidewall 25b.Utilize the board member 25B being connected the 1st sidewall 25a and the 2nd sidewall 25b sidepiece each other between the 1st sidewall 25a with the 2nd sidewall 25b to form the 3rd sidewall 25c, the 4th sidewall 25c, utilize this board member 25B formation roof 25d of top side of covering the 1st sidewall 25a, the 2nd sidewall 25b, the 3rd sidewall 25c, the 4th sidewall 25c.
Be formed with the 1st opening portion 25e in the center side of the 1st sidewall 25a, be arranged with the diaphragm seal 25f of the band shape formed by heat-resisting fabric at the Inner peripheral portions of the 1st opening portion 25e.Be formed with the 2nd opening portion 25g at the 2nd sidewall 25b in the mode extended to top from the bottom of the 2nd sidewall 25b, be arranged with the diaphragm seal 25h of the band shape formed by heat-resisting fabric at the Inner peripheral portions of the 2nd opening portion 25g.In the present embodiment, heat-resisting fabric is such as made up of the pieces of cloth of the heat-stable materials such as glasscloth, silica fiber cloth.
The 1st opening portion 25e being formed at the 1st sidewall 25a is formed with the width and height that can run through for the front of described feed path 3, the part of 1st sidewall 25a between front regulating part 15 and rear regulating part 16, and be set to the front can running through feed path 3 in the 1st opening portion 25e.The 2nd opening portion 25g being formed at the 2nd sidewall 25b is formed with the width and height that can run through for the inlet portion 6A side of described float bath 6,2nd sidewall 25b is positioned at the part of the side, front of front lintel 17, and be set to can to run through in the 2nd opening portion 25g float bath 6 inlet portion 6A side and by encirclement around the inlet portion 6A side of this float bath 6.
The communicating aperture 25k for supplying the non-oxidizing gas such as non-active gas is formed in the left and right sides, the bottom part of described 1st sidewall 25a.Further, two measuring communicating aperture 25m of internal atmosphere are formed with at described roof 25d.
The communicating aperture 25k being formed at the 1st sidewall 25a is connected with the feedway of not shown non-oxidizing gas, and being configured to can to non-oxidizing gas such as the internal feed non-active gas of lid main body 25.The communicating aperture 25m being formed at roof 25d is connected with not shown gas component tester and stress measuring device, is configured to the gaseous constituent containing oxygen concn of the inner side can detecting lid main body 25 and measures internal pressure.
In addition, although eliminate diagram in the accompanying drawings, but the part before being positioned at of roof 25d above regulating part 15 is formed with the open-work that the wireline for the lifting appliance being connected to regulating part oscilaltion runs through, front regulating part 15 by hanging for not moving up and down interferingly freely by lid main body 25.
When from the respective position of the communicating aperture 25k about the bottom being formed in the 1st sidewall 25a equably to the non-oxidizing gas such as internal feed nitrogen of lid main body 25, can directly nitrogen gas stream be blowed to the member side of surrounding around runner exit portion 21 supply nitrogen.In order to the inside utilizing nitrogen to be full of lid main body 25, need the internal feed nitrogen using stronger air-flow to lid main body 25, therefore preferably communicating aperture 25k is positioned at the position of the two bottom sides of the 1st sidewall 25a.
In addition, the communicating aperture 25m being formed at roof 25d is positioned at the position fully separated with the communicating aperture 25k of the 1st sidewall 25a, therefore when measuring the internal atmosphere of lid main body 25, can not measure the internal atmosphere of lid main body 25 by the airflow influence from communicating aperture 25k.
When the manufacturing installation of the float glass utilizing the structure shown in Fig. 1 ~ Fig. 3 manufactures glass ribbon 8, supply melten glass G from smelting furnace 2 to feed path 3, before utilizing, the interception amount of regulating part 15 adjusts the flow of the melten glass G of flowing on lip 5 and is supplied to by this melten glass G in the molten tin 7 of the inlet portion 6A of float bath 6.In float bath 6, the melten glass G of flowing in molten tin 7 is configured as the glass ribbon 8 of band plate-like of Rack, specific thickness, thus glass ribbon 8 can be obtained, this glass ribbon 8 is delivered to the cool furnace in ensuing operation and cutting unit, and this glass ribbon 8 is cut into the size of expectation, thus the sheet glass of expectation can be obtained.
When supplying melten glass G to described float bath 6, go bad to prevent the melten glass G flowed on the surface of molten tin 7, and to the gas that the internal feed of float bath 6 is main component with non-active gas such as nitrogen, suppress extraneous air (oxygen) to flow in float bath 6.Hydrogen containing reductibility in this gas, generates cassiterite crystal to be used for preventing the vapor-phase oxidation of molten tin 7.The gas being supplied to float bath 6 is externally discharged via the not shown pipeline at the top being located at float bath 6.
In addition, even if by reducing to prevent gas to runner exit portion 21 side inflow via the gap between the lower end of the front side wall 18 of front lintel 17 and the melten glass G of the below of front side wall 18, the part be supplied in the gas of float bath 6 also can arrive side, runner exit portion 21 via this gap of a part.Therefore, be mixed into some tin steam at the private side in runner exit portion 21, if therefore there is oxygen in the inside in runner exit portion 21, then likely generate cassiterite crystal.
Although easily make the hydrogen amount in float bath 6 be the hydrogen amount of the degree that cassiterite crystal can not grow, if but a large amount of hydrogen streams becomes a mandarin in export department 21, then can generate water in runner exit portion 21, and it is not preferred, therefore, a large amount of hydrogen can not be carried to runner exit portion 21, therefore may occur the situation of cassiterite crystal growth in runner exit portion 21.
According to the research of the present inventors, can it is clear that, even if the surrounding in runner exit portion 21 is covered by heat-resisting material and forms the enclosed space that is as the criterion, also can leak from the gap etc. of the moving part of the seam portion of heat-resisting material, front regulating part 15, for the structure not giving special heed to leakage, the oxygen of about 1000ppm ~ 2000ppm can be mixed into.
Therefore, for the manufacturing installation 1 of present embodiment, when manufacturing glass ribbon 8, under the state that the inside of lid main body 25 is filled with the non-oxidizing gas such as nitrogen, manufacture glass ribbon 8 as described.When manufacturing glass ribbon 8, preferably the internal pressure of lid main body 25 is controlled the pressure between normal atmosphere and (pressure in normal atmosphere+float bath).Such as, if the pressure in hypothesis float bath 6 is 5Pa ~ 25Pa, then the pressure in preferred scope pressure in lid main body 25 being set to 1 air pressure ~ (1 air pressure+5Pa ~ 25Pa).
The lid main body 25 of present embodiment covers the part of runner exit portion 21, the part of front regulating part 15 and the inlet portion 6A side of float bath 6.Therefore, be configured to such structure: utilize the higher part of the possibility of lid main body 25 covering generation leakage and these portion are surrounded by non-oxidizing gas, even if thus such as leak, non-oxidizing gas also can enter the private side in runner exit portion 21.Therefore, even if tin steam enters the private side in runner exit portion 21, also can not generate cassiterite crystal, thus glass ribbon 8 can be manufactured.Thus, there is following effect: there will not be the flaw produced because generating cassiterite crystal, the glass ribbon 8 of high-quality can be manufactured.
In addition, for the lid main body 25 of present embodiment, can be suppressed to entrained air in lid main body 25 around the leading section of feed path 3 by the diaphragm seal 25f arranging heat-resisting fabric at the 1st opening portion 25e, and part around the inlet portion 6A side of float bath 6 can be suppressed by the diaphragm seal 25h arranging heat-resisting fabric at the 2nd opening portion 25g to entrained air in lid main body.
In the manufacturing installation of common glass ribbon, if the poorly sealed close structure of the seam of heat-resisting material, then the oxygen of about 1000ppm ~ 2000ppm can be made to enter in runner exit portion 21 because of leakage.To this, even if in order to obtain can as far as possible the heat-resisting material of Leakage prevention seam construction and strictly carry out the design of stove, it is also the limit that oxygen concn is reduced to about 100ppm in the past, but according to the structure utilizing lid main body 25 to surround the surrounding in runner exit portion 21, then oxygen concn can be reduced to about 10ppm.In the past, at the per unit area (m on the surface of glass ribbon 8
2) inevitably grow the cassiterite crystal having several about 10, but adopt the present invention to have the effect of the degree that can be reduced to less than about 10.
The sidewall of the lid main body 25 used in the present embodiment is covered by metal board member 25B, but preferably make such structure: the window portion be made up of transparent glass, special teflon (registered trademark: tetrafluoroethylene) etc. is set in the 3rd sidewall 25c side of board member 25B and the 4th sidewall 25c side, thus can inside be monitored.In addition, when lid main body 25 is made brief configuration, the sheet materials such as special teflon (registered trademark) sheet also can be utilized to form sidewall, roof.In addition, also can be that framing member 25A is made up of metal frame and with mode retaining plate component 25B that is bonding, that embed, but preferably, board member 25B is the structure that can exchange with new board member.
Embodiment
In order to confirm effect of the present invention, utilize the production equipment of the glass ribbon shown in Fig. 1, when stable, carry out the float forming of display unit glass under the following conditions, confirm the adhesion condition of the cassiterite crystal of the per unit area at obtained surface of plate glass.
Tin vapor concentration in float bath is set as 6mg/m
3, the tin vapor concentration in runner exit portion is set as 0.5mg/m
3, the hydrogen concentration in float bath is set as 7 volume %, the hydrogen concentration in runner exit portion is set as 0.2 volume %, the nitrogen feed rate supplied to runner exit portion is set as 100Nm
3/ hour, the nitrogen feed rate supplied to float bath is set as 10Nm
3/ hour, the interval in the gap of front lintel is set as 15mm, operates in such a situa-tion.
In the running, the flow of the nitrogen to the supply of lid body interior is adjusted, the oxygen concn of adjustable cap body interior.And then the oxygen concn obtained thus also measured in runner exit portion, and the flaw number produced because cassiterite crystal falls at obtained ribbon surfaces when producing glass ribbon in this condition by visual confirmation.In addition, when the oxygen concn of lid body interior is controlled to be 21%, 10%, 2%, 1%, 0.3%, 0.1%, the oxygen concn of runner exit inside is 1300ppm, 1100ppm, 130ppm, 60ppm, 20ppm, 5ppm in each condition, confirms the flaw number in various situation.Be expressed as follows together with above result.
Oxygen concn in lid main body: oxygen concn 0.013% → flaw number: 350cps/m in 21% → runner exit
2.
Oxygen concn in lid main body: oxygen concn 0.011% → flaw number: 250cps/m in 10% → runner exit
2.
Oxygen concn in lid main body: oxygen concn 0.0013% → flaw number: 110cps/m in 2% → runner exit
2.
Oxygen concn in lid main body: oxygen concn 0.0006% → flaw number: 45cps/m in 1% → runner exit
2.
Oxygen concn in lid main body: oxygen concn 0.0002% → flaw number: 4cps/m in 0.3% → runner exit
2.
Oxygen concn in lid main body: oxygen concn 0.00005% → flaw number: 0.5cps/m in 0.1% → runner exit
2.
Be judged as according to this test-results, along with the oxygen concn reduction in lid main body, the flaw number of ribbon surfaces can reduce gradually, if particularly oxygen concn is set as less than 0.3%, then can cut down the flaw of glass ribbon significantly.
Therefore, preferably the oxygen concn in lid main body is adjusted to less than 0.3%, is more preferably adjusted to less than 0.1%.
The Japanese Patent that the application filed an application based on September 19th, 2012 goes out to be willing to 2012-206307, and this content is programmed in this specification sheets as reference.
utilizability in industry
Technology of the present invention can be widely used in the apparatus and method forming glass ribbon by implementing float glass process usually.
description of reference numerals
G, melten glass; 1, the manufacturing installation of float glass; 2, smelting furnace; 3, feed path; 5, lip; 6, float bath; 6A, inlet portion; 7, molten tin; 8, glass ribbon; 10, stream; 11, preposition piece; 15, front regulating part; 17, front lintel; 18, front side wall; 21, runner exit portion; 25, lid main body; 25A, framing member; 25B, board member; 25a, the 1st sidewall; 25b, the 2nd sidewall; 25c, the 3rd sidewall, the 4th sidewall; 25d, roof; 25e, the 1st opening portion; 25f, diaphragm seal; 25g, the 2nd opening portion; 25h, diaphragm seal; 25k, 25m, communicating aperture.
Claims (11)
1. the manufacturing installation of a float glass, the manufacturing installation of this float glass is used for the melten glass come from smelting furnace supply to be supplied to float bath via feed path and runner exit portion, and make this melten glass along be stored in this float bath molten tin surface flow and be configured as the glass ribbon of band plate-like, wherein
Described feed path, described runner exit portion and described float bath inlet portion are formed by combining multiple heat-resisting material respectively,
There is the 1st sidewall, 2nd sidewall, 3rd sidewall, the lid main body of the 4th sidewall and roof is to cover described feed path leading section, the mode of described runner exit portion and described float bath inlet portion is arranged, the mouth blown of non-oxidizing gas is formed at the sidewall of described lid main body, described 1st sidewall has opening portion, this opening portion surrounds the feed path leading section be made up of described heat-resisting material, described 2nd sidewall is configured to relative with described 1st sidewall, and there is opening portion, this opening portion surrounds the inlet portion of the float bath be made up of described heat-resisting material, described 3rd sidewall, described 4th sidewall is positioned at the outside in described runner exit portion, described 1st sidewall and described 2nd sidewall are coupled together, described roof is connected with these sidewalls.
2. the manufacturing installation of float glass according to claim 1, wherein,
The diaphragm seal in heat-resisting material described in landfill and the gap between the inner peripheral of described opening portion is provided with in the mode of pasting at the opening portion inner peripheral of described 1st sidewall and the opening portion inner peripheral of described 2nd sidewall.
3. the manufacturing installation of float glass according to claim 1 and 2, wherein,
Described lid main body is made up of framing member and the board member integrated with this framing member, and this framing member is metal, and arrange along the periphery of described sidewall and the periphery of described roof, described board member forms described sidewall and described roof.
4. according to the manufacturing installation of the float glass in claims 1 to 3 described in any one, wherein,
The mouth blown of described non-oxidizing gas is formed in the left and right sides of described 1st sidewall bottom.
5. according to the manufacturing installation of the float glass in Claims 1 to 4 described in any one, wherein,
Regulating part before the feed path leading section of described melten glass is provided with, this front regulating part carries out flow adjustment for a part of tackling at the melten glass of this feed path internal flow, and described 1st sidewall is arranged on the position of setting position by upstream side of regulating part more front than this.
6. according to the manufacturing installation of the float glass in Claims 1 to 5 described in any one, wherein,
Lintel before described float bath inlet portion is provided with, described 2nd sidewall is set as and surrounds around this front lintel.
7. the manufacture method of a float glass, the manufacture method of this float glass is used for the melten glass come from smelting furnace supply to be supplied to float bath via feed path and runner exit portion, and make this melten glass along be stored in this float bath molten tin surface flow and be configured as the glass ribbon of band plate-like, wherein
The feed path leading section utilizing the lid main body that is made up of sidewall and roof to cover to be made up of heat-resisting material, runner exit portion and float bath inlet portion, under the state that the inside of this lid main body is filled with non-oxidizing gas, described melten glass is supplied to described float bath and molding glass band via described feed path and runner exit portion.
8. the manufacture method of float glass according to claim 7, wherein,
Described lid main body is made up of such as lower part, that is: the 1st sidewall, and it has opening portion, and this opening portion surrounds the feed path leading section be made up of described heat-resisting material; 2nd sidewall, it is configured to relative with described 1st sidewall, and has opening portion, and this opening portion surrounds the inlet portion of the float bath be made up of described heat-resisting material; 3rd sidewall, the 4th sidewall, it is positioned at the outside in described runner exit portion, described 1st sidewall and described 2nd sidewall is coupled together; And roof, it is connected with these sidewalls.
9. the manufacture method of the float glass according to claim 7 or 8, wherein,
The diaphragm seal in heat-resisting material described in landfill and the gap between the inner peripheral of described opening portion is provided with in the mode of pasting at the opening portion inner peripheral of described 1st sidewall and the opening portion inner peripheral of described 2nd sidewall.
10. according to the manufacture method of the float glass in claim 7 ~ 9 described in any one, wherein,
The mouth blown of described non-oxidizing gas is formed in the left and right sides of described 1st sidewall bottom, is blown into non-oxidizing gas equably from the mouth blown of both sides.
11., according to the manufacture method of the float glass in claim 7 ~ 10 described in any one, is characterized in that,
The inside of described lid main body is full of non-oxidizing gas, makes the oxygen concn of described lid body interior be less than 0.3%.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012-206307 | 2012-09-19 | ||
| JP2012206307A JP2015221725A (en) | 2012-09-19 | 2012-09-19 | Manufacturing apparatus and manufacturing method of float glass |
| PCT/JP2013/073094 WO2014045822A1 (en) | 2012-09-19 | 2013-08-29 | Device and method for producing float glass |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104640818A true CN104640818A (en) | 2015-05-20 |
| CN104640818B CN104640818B (en) | 2017-03-08 |
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ID=50341144
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201380048806.1A Active CN104640818B (en) | 2012-09-19 | 2013-08-29 | The manufacture device and manufacture method of float glass |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP2015221725A (en) |
| KR (1) | KR20150058225A (en) |
| CN (1) | CN104640818B (en) |
| TW (1) | TW201418173A (en) |
| WO (1) | WO2014045822A1 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0623057B2 (en) * | 1985-09-12 | 1994-03-30 | 旭硝子株式会社 | Float glass manufacturing equipment |
| JP2010070417A (en) * | 2008-09-18 | 2010-04-02 | Nippon Electric Glass Co Ltd | Device and method for manufacturing glass plate |
-
2012
- 2012-09-19 JP JP2012206307A patent/JP2015221725A/en active Pending
-
2013
- 2013-08-29 WO PCT/JP2013/073094 patent/WO2014045822A1/en active Application Filing
- 2013-08-29 KR KR1020157006829A patent/KR20150058225A/en not_active Application Discontinuation
- 2013-08-29 CN CN201380048806.1A patent/CN104640818B/en active Active
- 2013-09-06 TW TW102132279A patent/TW201418173A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| CN104640818B (en) | 2017-03-08 |
| WO2014045822A1 (en) | 2014-03-27 |
| TW201418173A (en) | 2014-05-16 |
| KR20150058225A (en) | 2015-05-28 |
| JP2015221725A (en) | 2015-12-10 |
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Address after: Tokyo, Japan, Japan Patentee after: AGC Corporation Address before: Tokyo, Japan, Japan Patentee before: Asahi Glass Co., Ltd. |