CN104743776A - Method for producing float plate glass - Google Patents
Method for producing float plate glass Download PDFInfo
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- CN104743776A CN104743776A CN201410831793.1A CN201410831793A CN104743776A CN 104743776 A CN104743776 A CN 104743776A CN 201410831793 A CN201410831793 A CN 201410831793A CN 104743776 A CN104743776 A CN 104743776A
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- Prior art keywords
- temperature
- molten metal
- glass
- drain pan
- manufacture method
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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
- 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
Abstract
The invention aims to provide a method of producing float plate glass, which is free of defects and is high in quality, in a float-method trough for forming molten glass without generation of bubbles.
Description
Technical field
The present invention relates to the method utilizing float glass process to manufacture sheet glass.
Background technology
When utilizing float glass process to manufacture sheet glass, usually manufacture by the method for following explanation.This melten glass, after obtaining melten glass, is being supplied on the surface of the molten metals such as the molten tin be contained in float bath by frit heating and melting continuously.
Make melten glass along the surface of molten metal from upstream side to downstream side conveying while molding glass band, pull out this glass ribbon from float bath, annealed and after cleaning, the sheet glass of target sizes can obtained by cut-out.
This utilizes the productivity of the manufacture method of float forming manufacture sheet glass higher, and the flatness of the sheet glass obtained is excellent.Thus, the sheet glass formed by float forming is widely used in panel for construction glass, automobile sheet glass, FPD (flat-panel monitor) sheet glass etc.
Float bath is paved with brick of multiple ends in the inside of metal drain pan and is configured to bath shape, in this bath, accumulate molten metal.The superjacent air space of molten metal by by metal top cover and be arranged at top cover tectosome that the refractory brick inside it forms surround.The superjacent air space of molten metal is adjusted to the non-active gas atmosphere comprising hydrogen, to make molten metal not oxidized.
By while melten glass is supplied to described molten metal surface on and move to downstream effluent from the upstream side of float bath, utilize top roll by two side stretchings of melten glass, and the glass ribbon of thickness desired by being shaped, width.Lehr rollers set in the annealing furnace in the downstream side being arranged at float bath can be utilized to be pulled out from the surface of molten metal by this glass ribbon.
When float bath is the duplex of drain pan and end brick as described, if molten metal immerses the seam of end brick and arrives drain pan, then molten metal may make drain pan deform or damage.
Therefore, adopted following structure: the bottom outer surface to drain pan blows the air of cooling to cool drain pan, and makes the molten metal solidification near arrival drain pan in the past.Following technology is described: in the past as the device for cooling drain pan in patent documentation 1, arm and the temperature sensor of multiple ejiction opening is provided with at the bottom surface side of drain pan, utilize the temperature of the outside surface of temperature sensor measurement drain pan while equably to its cooling, controlled below 4 DEG C by the hull-skin temperature of drain pan.
In addition, describe in patent documentation 2 and at the outside surface of drain pan, water cooling tube be set by heat-transfer matcrial and cool the structure of drain pan, describe in patent documentation 3 and be configured with the float bath of the ejiction opening of multiple cooling air at drain pan in the mode corresponding with refractory brick seam each other.
Patent documentation 1: No. 2012/060197th, International Publication
Patent documentation 2: No. 2013/024649th, International Publication
Patent documentation 3: Japanese Unexamined Patent Publication 2012-036082 publication
Summary of the invention
the problem that invention will solve
In the float bath of described structure, the end brick being arranged at the inside of drain pan is owing to being subject to the heat of molten metal and thermal expansion, therefore when constructing float bath, when arranging end brick with normal temperature, estimate the amount of thermal expansion, at end brick each other to separate the mode in the gap of several mm degree to arrange end brick.Therefore, when having accumulated molten metal in float bath, between brick of multiple ends, there is the seam of minute widths, and molten metal immerses each seam.Due to the drain pan of float bath from the outer side of the drain pan of float bath by air cooling, the temperature therefore having immersed the molten metal of seam more reduces the closer to drain pan, is present in the molten metal solidification of the part near drain pan in seam.
In float bath when shaping molten glass, there is following problem: the phenomenon finding to produce from the end brick seam bubble, this bubble contacts with melten glass, and bubble is involved in the bottom side surfaces of glass ribbon, and becomes surface imperfection.This surface imperfection can be called BOS (bottom open seed).
During the glass particularly utilizing float glass process manufacture to form with the temperature higher than the temperature of common soda-lime glass in recent years as non-alkali glass, the tendency producing BOS in float bath is comparatively strong, makes to become problem in glass quality raising.
The present invention makes to solve problem described above, therefore its object is to provide a kind of manufacture method can producing the float flat glass of the sheet glass not having defective high-quality in shaping molten glass float bath in the mode not producing the defect being involved in bubble.
for the scheme of dealing with problems
(1) manufacture method of float flat glass of the present invention, it is the manufacture method of the float flat glass possessing following operation: accumulated in by molten metal, configure in the float bath of brick of multiple ends on metal drain pan, on this molten metal, supply melten glass and make this melten glass be configured as glass ribbon, this manufacture method possesses following operation:
Described molten metal is dropped in described float bath, molten metal accumulates in described float bath by the state being immersed in brick of described end seam each other with molten metal, described drain pan to be cooled and after the bottom outer surface temperature of this drain pan being maintained the management temperature of below the fusing point of tin, supply on described molten metal described melten glass to be shaped described glass ribbon when
The bottom outer surface temperature of described drain pan is remained on higher than described management temperature more than 15 DEG C and be, after the high-temperature-range of less than 200 DEG C, the bottom outer surface temperature of described drain pan is reduced to glass ribbon described in the postforming of specific described management temperature.
(2) in the manufacture method of float flat glass of the present invention, preferably: described molten metal is tin, by the bottom outer surface of described drain pan is cooled to make the bottom side of described seam lower than the temperature of the fusing point of tin molten tin solidification and temperature treatment at described high-temperature-range, and the bubble that generates in the molten tin in described seam is reduced.(3) in the manufacture method of float flat glass of the present invention, preferably described float bath top cover tectosome is covered and the upper space of described molten metal is separated, be full of the non-active gas comprising hydrogen at this upper space, suppress the generation of bubble.(4) in the manufacture method of float flat glass of the present invention, preferably: the blast pipe in the configuration of the bottom outer surface side of described drain pan with cooling gas vent, when carrying cooling gas bottom outer surface to described drain pan to cool via described blast pipe to the bottom outer surface of described drain pan by gas blower, reduce the air capacity sent by described gas blower, and make the temperature of the bottom outer surface of described drain pan remain on described high-temperature-range.(5) in the manufacture method of float flat glass of the present invention, it possesses following operation: by promoting the speed pulling out described glass ribbon from described molten metal, and change the flowing of the cycling stream generated in described molten metal, the molten metal of the end brick seam be each other paved with described in being immersed in is flowed forcibly.
(6) in the manufacture method of float flat glass of the present invention, it possesses following operation: by changing the thickness of slab of the described glass ribbon when described molten metal pulls out, and promote the pull-out speed of described glass ribbon, and change the flowing of the cycling stream generated in described molten metal, the molten metal of the end brick seam be each other paved with described in being immersed in is flowed forcibly.(7) in the manufacture method of float flat glass of the present invention, it possesses following operation: wide by the plate changing the described glass ribbon when described molten metal pulls out, and promote the pull-out speed of described glass ribbon, and change the flowing of the cycling stream generated in described molten metal, the molten metal of the end brick seam be each other paved with described in being immersed in is flowed forcibly.(8) in the manufacture method of float flat glass of the present invention, preferably vibration is applied to the bottom outer surface of described drain pan.
(9) in the manufacture method of float flat glass of the present invention, as described melten glass, the non-alkali glass representing, have following composition with the quality percentage of oxide compound benchmark is used:
SiO
2：50～73％、Al
2O
3：10.5～24％、B
2O
3：0～12％、MgO：0～10％、CaO：0～14.5％、SrO：0～24％、BaO：0～13.5％、MgO+CaO+SrO+BaO：8～29.5％、ZrO
2：0～5％。(10) in the manufacture method of float flat glass of the present invention, as described melten glass, the non-alkali glass representing, have following composition with the quality percentage of oxide compound benchmark is used:
SiO
2：58～66％、Al
2O
3：15～22％、B
2O
3：5～12％、MgO：0～8％、CaO：0～9％、SrO：3～12.5％、BaO：0～2％、MgO+CaO+SrO+BaO：9～18％。(11) in the manufacture method of float flat glass of the present invention, as described melten glass, the non-alkali glass representing, have following composition with the quality percentage of oxide compound benchmark is used:
SiO
2：54～73％、Al
2O
3：10.5～22.5％、B
2O
3：0～5.5％、MgO：0～10％、CaO：0～9％、SrO：0～16％、BaO：0～2.5％、MgO+CaO+SrO+BaO：8～26％。
the effect of invention
The invention is characterized in, in float bath, the temperature of the bottom outer surface of drain pan during shaping molten glass is remained on higher than specific management temperature more than 15 DEG C and be, after the high-temperature-range of less than 200 DEG C, this temperature is reduced to described specific management temperature postforming glass ribbon.So, by the bottom outer surface temperature of drain pan temporarily being remained on the high-temperature-range higher than management temperature, can be exhausted in the molten metal of seam immersing end brick.By after carrying out this exhaust, the bottom outer surface of drain pan is set as specifically managing temperature carrys out molding glass band, can be shaped the glass ribbon not being involved in bubble, not having with bubble the defect being cause.
In float bath, sometimes produce bubble in seam.Temporarily remain on higher high-temperature-range by the temperature of the bottom outer surface by drain pan, can be exhausted from the molten tin of seam.By carrying out this exhaust postforming glass ribbon, can be shaped the glass ribbon not being involved in bubble, not having with bubble the defect being cause.
Accompanying drawing explanation
Fig. 1 is the sectional view of the example that the float sheet glass manufacturing apparatus used for implementing manufacture method of the present invention is shown.
Fig. 2 is the vertical view of the state that the melten glass flowed on the molten metal of this float bath is shown.
Embodiment
Below, with reference to accompanying drawing, be described the manufacture method of float flat glass of the present invention, the present invention is not restricted to the embodiment of following explanation.
As shown in Figure 1, so a kind of device for implementing the manufacturing installation 1 of the float flat glass of the manufacture method of present embodiment: the melten glass G making to be supplied to float bath device 2 flows on the surface of the molten tin be contained in float bath device 2 (molten metal) 3, while utilize the top roll 4 shown in Fig. 2 to expand from its both sides, it is made to flow to downstream side from the upstream side of float bath device 2, and the glass ribbon 5 of the band plate-like that is shaped.
As shown in Figure 1, float bath device 2 has float bath 2A and the top cover tectosome 2B that arranges above it and forms.As shown in Figure 1, be provided with the smelting furnace of melten glass at the upstream side of float bath device 2, supply melten glass G from this smelting furnace to float bath 2A, the glass ribbon 5 be shaped in float bath 2A is carried to annealing furnace 8 via the chamber 7 in the downstream side being located at float bath 2A.Utilize the runner 9 being located at chamber 7 by the surperficial pull-up of glass ribbon 5 from molten metal 3, utilize the conveying roller 10 being located at annealing furnace 8 carry in annealing furnace 8 and anneal.
As shown in Figure 2, utilize the top roll 4 being configured at the left and right sides of melten glass G obliquely to apply tension force to the melten glass G being supplied to float bath 2A, be adjusted to width and the thickness of needs.
In addition, float bath device 2, chamber 7 and annealing furnace 8 is carried out cutting and the longitudinal section obtained along the travel direction (length direction of glass ribbon 5) of glass ribbon 5 by Fig. 1.
As shown in Figure 1, from float bath 2A be delivered to annealing furnace 8 and chilled glass ribbon 5 in ensuing operation clean after, utilize shut-off device to cut into specified dimension, obtain the sheet glass of target sizes.
In the float bath 2A of present embodiment, the melten glass G transported via supply passageway 12 from diagram elliptical smelting furnace is supplied to the inlet portion 2a of the upper reaches end of this float bath 2A via the flange (Japanese: リ ッ プ) 13 of the terminal part being located at supply passageway 12.The regulating part (Japanese: ツ イ ー Le) 14 of the flowing for regulating melten glass G is provided with at the supply passageway 12 of the upstream side of flange 13.Described supply passageway 12, float bath 2A are all formed by assembling the heat-resisting materials such as multiple refractory brick, but have carried out simple diagram in FIG.
In float bath device 2, utilize top cover tectosome 2B to surround the superjacent air space of float bath 2A, block superjacent air space and the outside atmosphere of molten metal 3 as much as possible, make its inside remain on the reducing atmospheres such as the nitrogen atmosphere of the hydrogen comprising less than 12% degree.
Front side wall 15 is formed in the side, upper reaches of float bath 2A, inlet portion 2a is formed at the bottom side of this front side wall 15, be formed with back face wall 17 in the dirty side of float bath 2A, below, the position of the below of wall 17, the liquid level of close molten metal 3 is formed with the export department 2c of glass ribbon 5.
There is front side wall 15, back face wall 17, float bath top cover 16 and form top cover tectosome 2B in float bath 2A.In addition, be configured within it hang in top cover tectosome 2B and be supported with diagram top, elliptical, top is provided with multiple well heater, so as can regulate temperature in float bath 2A.In addition, flow out the gas of the reducing atmosphere of the inside of some formation float bath devices 2 to chamber 7 side from the export department 2c pulled out by glass ribbon 5.
The chamber 7 being located at the downstream side of float bath 2A is made up of slag case (Japanese: De ロ ス ボ ッ Network ス) 7A, top 7B and diagram elliptical sidewall, and the inside of slag case 7A arranges three runners 9 in the present embodiment.Slag case 7A is formed the bottom side of chamber 7 in mode float bath 2A and annealing furnace 8 coupled together.
In slag case 7A, be configured with the base 22 of the wall-like of the sealing block 21 being provided with graphite-made on top in the lower side of runner 9, to be used for blocking the air-flow between float bath 2A and annealing furnace 8.
The top 7B of chamber 7 comprises the curtain 25 of the cover portion 24 be arranged between float bath 2A and annealing furnace 8 and the lower surface being hung on cover portion 24.Curtain 25 is the partition member of tabular, and the internal space of chamber 7 is separated into multiple spatial portion by its throughput direction along glass ribbon 5.
Annealing furnace 8 is configured to path type, and the inner horizontal of this annealing furnace 8 is provided with multiple conveying roller 10, can while utilize multiple conveying roller 10 to be conveyed through glass ribbon 5 that chamber 7 moves, this glass ribbon 5 be annealed.
Then, for the structure of float bath 2A, illustrate in further detail.
The float bath 2A of present embodiment forms at the internal arrangement configuration brick of multiple ends 31 of the metal drain pan 30 of more shallow container type.The constituent material of end brick 31 preferably, the material lower relative to the reactivity of the tin of molten metal 3 or do not have reactive material and have the material of high temperature wet fastness, can use the materials such as aluminum oxide, sillimanite (fibrolite), clay matter.The constituent material of drain pan 30 is not particularly limited, and is made up of iron or stainless steel and other metal materials.
The end brick being configured at the peripheral portion of drain pan 30 in end brick 31 is higher, is separated with some ground, gap (seam) 32 each other arranges multiple lower end brick 31 in the inner side of higher end brick 2b.Although be paved with brick of multiple ends 31, even if be subject to the heat of molten metal 3 and make end brick 31 expand, between adjacent end brick 31,31, be also formed with the seam 32 be made up of the interval of several mm degree.
The refrigerating unit 33 for cooling drain pan 30 is provided with in the below of drain pan 30.This refrigerating unit 33 is formed by with lower device: the blast pipe 35 being located at the below of drain pan 30; The gas blower 36 of air is carried to this blast pipe 35; Be located at multiple temperature sensors 37 of the bottom outer surface of drain pan 30; And receive the temperature measurement result of these temperature sensors 37 and control the control device 38 of the output of gas blower 36.
The supervisor 35A that blast pipe 35 is extended by the length direction along float bath 2A and be upwards branched off into a type with the interval of regulation and the outstanding multiple take-off pipe 35B formed are formed on the length direction of this supervisor 35A, the ejiction opening 35C being formed at the top of each take-off pipe 35B is distributed in the mode relative with the bottom outer surface of drain pan 30.Blast pipe 35 is as the path of the air of the cooling of carrying from gas blower 36, and the air of cooling is sent to the side-blown of the bottom outer surface of drain pan 30 by from each ejiction opening 35C.
Temperature sensor 37 is the devices of the bottom outer surface temperature measuring drain pan 30, is provided with multiple at the bottom outer surface of drain pan 30 with the interval of regulation.
Refrigerating unit 33 has following function: utilize multiple temperature sensor 37 to measure the temperature of the bottom outer surface of drain pan 30, and based on its temperature measurement result, the imperial device 38 of system is utilized to control, to adjust the output of gas blower 36, and to make the temperature of the bottom outer surface of drain pan 30 be homogenization temperature as far as possible.
When using the manufacturing installation 1 of the float flat glass of structure described above and passing through float forming glass ribbon 5, after constructing float bath device 2, accumulate molten metal 3 at float bath 2A.In addition, gas blower 36 is worked, the outside bottom surface side conveying air from the ejiction opening 35C of each take-off pipe 35B to drain pan 30 and cool the outside bottom surface of drain pan 30.
When constructing float bath device 2, drain pan 30 arranging brick of multiple ends 31 with the compartment of terrain separating regulation, even if end brick 31 is subject to the heat of molten metal 3 and expands, between the brick of multiple ends 31 be set up in parallel, is also formed with the seam 32 of several mm degree.Therefore, under the state containing molten metal 3 in float bath 2A, a part for molten metal 3 immerses seam 32.
At this, the manufacturing condition of glass ribbon 5 is as described below: when starting shaping molten glass G on the surface of molten metal 3 flowing into melten glass G from inlet portion 2a, utilize the cooling power of refrigerating unit 33, while blow the air of cooling from ejiction opening 35C and make the temperature of the bottom outer surface side of drain pan 30 maintain the specific management temperature of below the fusing point of tin, shaping molten glass G.
To this, in the present embodiment, the temperature of the bottom outer surface of drain pan 30 is remained on more than 15 DEG C and the high-temperature-range of less than 200 DEG C of temperature as the bottom outer surface of drain pan 30 high relative to described specific management temperature.In addition, as an example of high-temperature-range, it is further preferred that select the temperature field relative to described specific management temperature such as high more than 40 DEG C.
Hold-time does not limit especially, can select a few hours ~ scope of hundreds of hours.In order to temperature is remained on described high-temperature-range, the blast volume from the ejiction opening 35C cooled the bottom outer surface of drain pan 30 is made to reduce the ratio of regulation.
As an example, when the management temperature of the bottom outer surface by the drain pan 30 during molding glass band 5 is set to 85 DEG C, preferably, the temperature of high relative to this temperature 15 DEG C ~ 60 DEG C is selected to be such as the scope of 100 DEG C ~ 145 DEG C and to remain on this temperature range.Similarly, when the management temperature of the bottom outer surface by drain pan 30 is set to 100 DEG C, preferably, the temperature of high relative to this temperature 15 DEG C ~ 60 DEG C is selected to be such as the scope of 115 DEG C ~ 160 DEG C and to remain on this temperature range.Similarly, when the management temperature of the bottom outer surface by drain pan 30 is set to 70 DEG C, preferably, the temperature of high relative to this temperature 15 DEG C ~ 60 DEG C is selected to be such as the scope of 85 DEG C ~ 130 DEG C and to remain on this temperature range
In addition, using the high-temperature-range than high such as more than 40 DEG C of above-mentioned management temperature as the example of preferred high-temperature-range, can select between 100 DEG C ~ 200 DEG C when managing temperature 85 DEG C, can selecting between 115 DEG C ~ 200 DEG C when managing temperature 100 DEG C, can select between 85 DEG C ~ 200 DEG C when managing temperature 70 C.Described management temperature can be set as the arbitrary temperature of below the fusing point of tin.
Remain on described high-temperature-range by the temperature of the bottom outer surface by drain pan, bubble can be generated since seam, and make bubble increase and float up to the liquid level of molten metal 3, can from seam 32 deaeration by bubbles burst.
By keeping the necessary time at described high-temperature-range, if facilitate bubble fully, then the temperature treatment below the fusing point surface temperature of drain pan 30 being returned to tin.For recovery temperature, the air blast increasing the gas blower 36 of the outside bottom surface side for cooling drain pan 30 exports and increases the blast volume from ejiction opening 35C.
After having carried out deaeration described above, use the manufacturing installation 1 of float flat glass, make melten glass G flow to from the inlet portion 2a of the top stream end of float bath 2A the export department 2c molding glass band 5 flowing end on the lower.Then, utilize runner 9 from molten metal 3 pull-up glass ribbon 5 and it is carried to chamber 7, and then, utilizing conveying roller 10 to carry glass ribbon 5 in annealing furnace 8 side, thus can cooled glass band 5, the glass ribbon 5 that cooled.
In addition, utilize the diagram elliptical washing unit being located at the downstream side of annealing furnace 8 and shut-off device by cutting off the sheet glass that can obtain target width and length.
As the glass of shaping being applicable to described glass ribbon 5, the following non-alkali glass shown in composition example can be used.
As the 1st example, the non-alkali glass representing, have following composition with the mass percent of oxide compound benchmark can be used.
SiO
2：50～73％、Al
2O
3：10.5～24％、B
2O
3：0～12％、MgO：0～10％、CaO：0～14.5％、SrO：0～24％、BaO：0～13.5％、MgO+CaO+SrO+BaO：8～29.5％、ZrO
2：0～5％。
As the 2nd example, the non-alkali glass representing, have following composition with the mass percent of oxide compound benchmark can be used.
SiO
2：58～66％、Al
2O
3：15～22％、B
2O
3：5～12％、MgO：0～8％、CaO：0～9％、SrO：3～12.5％、BaO：0～2％、MgO+CaO+SrO+BaO：9～18％。
As the 3rd example, the non-alkali glass representing, have following composition with the mass percent of oxide compound benchmark can be used.
SiO
2：54～73％、Al
2O
3：10.5～22.5％、B
2O
3：0～5.5％、MgO：0～10％、CaO：0～9％、SrO：0～16％、BaO：0～2.5％、MgO+CaO+SrO+BaO：8～26％。
As use described non-alkali glass the sheet glass utilizing float glass process to manufacture, such as, if display unit glass, then can example thickness is 0.7mm ~ 0.1mm, longitudinal width is 2500mm, transverse width is 2200mm etc. sheet glass.
The forming temperature of the non-alkali glass of described composition is the temperature higher than common soda-lime glass in the past, and the deaeration operation of therefore described seam becomes more important.If fully carry out the deaeration of the seam 32 of float bath 2A, even the sheet glass be made up of the described non-alkali glass formed, the sheet glass of the high-quality not having air blister defect also can be manufactured.
But, when utilizing described manufacture method molding glass band 5, also can have following operation: thin by the thickness of slab of the glass ribbon making the thickness ratio when molten metal 3 pulls out glass ribbon 5 manufactured up to now, thus the speed when molten metal 3 pulls out glass ribbon 5 is improved.
When making speed when pulling out glass ribbon 5 from molten metal 3 improve, the state of the cycling stream shown in arrow a, b, c of the Fig. 2 generated in molten metal 3 can be changed, and the molten metal 3 of the seam 32 being immersed in float bath 2A is flowed forcibly.Deaeration can be carried out in butt seam portion 32 by this operation.
In addition, also following operation can be had: by making the width when molten metal 3 pulls out glass ribbon 5 narrower than the width of glass ribbon 5 manufactured up to now, thus the speed when molten metal 3 pulls out glass ribbon 5 is improved.
And, when carrying out the deaeration of described seam 32, the operation bottom of drain pan 30 being applied to impact or vibration also can be had.
By carrying out the operation bottom of drain pan 30 being applied to impact or vibration, the generation of the bubble in seam 32 can be promoted, the deaeration of seam 32 can be promoted by this operation.
[embodiment]
Use the manufacturing installation of float glass of the structure shown in Fig. 1, Fig. 2, metal drain pan separates being paved with end brick with gap of several mm and form wide several m, long number ten m scale float bath in, accumulate molten tin as molten metal.The following melten glass that forms of supply on this molten tin and make it be configured as glass ribbon.Atmosphere in the molten tin of float bath is the nitrogen atmosphere comprising 8% hydrogen.
The composition of the melten glass used, is expressed as SiO with the quality percentage of oxide compound benchmark
2: 55%, Al
2o
3: 13%, B
2o
3: 4%, MgO:4%, CaO:6%, SrO:10%, BaO:6%, ZrO
2: 2%.
Dropping into described molten metal to described float bath and before supplying melten glass, regulate the blast volume of gas blower and the bottom outer surface temperature of the drain pan of float bath is controlled after the temperature illustrated subsequently, the melten glass of described composition is supplied to molten tin and the glass ribbon that is shaped.
In addition, exported by adjustment well heater, keep the temperature of molten tin, make melten glass flow and carry out the shaping of glass ribbon in this condition.
Measure the difference of the top temperature-minimum temperature of the drain pan of 1 month after tin is dropped into float bath and bubble after which produces number (BOS number/m
2).In addition, the temperature in float bath is different because of the flow direction of molten tin, or different because of composition, and therefore the management temperature of drain pan represents with the difference of top temperature-minimum temperature.
The No.1 case of table 1 shown below be adjusted to than the high high-temperature-range of management temperature and temperature head in the case of the scope of 21 DEG C, No.2 case be adjusted to than the high high-temperature-range of management temperature and temperature head in the case of the scope of 55 DEG C, No.3 case be adjusted to than the high high-temperature-range of management temperature and temperature head in the case of the scope of 16 DEG C, No.4 case be adjusted to the high-temperature-range higher than management temperature and temperature head in the case of the scope of 47 DEG C.In each case, the bubble measured after melten glass is dropped into float bath after 20 days produces number (BOS number/m
2), bubble after 40 days produces number and the bubble after 60 days produces number.
The temperature making arbitrary case carry out about 10 days controls near top temperature, afterwards, experiences about about 5 days gradually to the management greenhouse cooling of target, after remaining on the management temperature corresponding with the difference of described temperature, measures bubble and produces number.
Bubble produces number (BOS number/m
2) measurement utilize lens to carry out the surface observation of obtained glass.
[table 1]
From the result shown in table 1, by the difference of temperature being attached to the scope of 16 DEG C ~ 55 DEG C, through certain number of days, bubble produces number to be reduced.
In addition, the rising degree of the temperature of No.2,4 cases be greater than No.1,3 the rising degree of temperature of case, therefore about the speed of the decay of BOS, judge large more effective of the rising degree of temperature.
From the result shown in table 1, when the temperature that the bottom outer surface temperature bottom outer surface temperature of drain pan being maintained drain pan when producing than glass ribbon is high, as long as high more than 15 DEG C, just can Results.This effect can confirm the example of 55 DEG C.
In addition, relatively can be thought by these, when the difference of temperature is higher, effectively reduces bubble and produce number.Therefore, think more preferably high more than 20 DEG C.In addition, the temperature being increased beyond 55 DEG C is also fine certainly, because the temperature of drain pan is also no problem in the configuration aspects of drain pan when reaching about 200 DEG C, and therefore also can by the temperature to 200 DEG C of the bottom outer surface of drain pan.But, when the temperature more than 200 DEG C, due to the fusing point close to molten tin, be therefore set to the temperature controlled upper limit by 200 DEG C.
The application is that the Japanese Patent of applying for based on December 26th, 2013 to be willing to 2013-270209, and its content is incorporated in this as a reference.
Description of reference numerals
2 ... float bath device, 2A ... float bath, 2a ... inlet portion, 2b ... higher end brick, 2c ... export department, 3 ... molten metal, G ... melten glass, 4 ... top roll, 5 ... glass ribbon, 7A ... slag case, 7 ... chamber, 8 ... annealing furnace, 9 ... runner, 10 ... conveying roller, 30 ... drain pan, 31 ... end brick, 32 ... seam, 33 ... refrigerating unit, 35 ... blast pipe, 35A ... supervisor, 35B ... take-off pipe, 35C ... ejiction opening, 36 ... gas blower, 37 ... temperature sensor, 38 ... control device.
Claims (11)
1. the manufacture method of a float flat glass, it is the manufacture method of the float flat glass possessing following operation: in being accumulated in by molten metal, be paved with float bath that brick of multiple ends configures on metal drain pan, on this molten metal, supply melten glass and make this melten glass be configured as glass ribbon
This manufacture method possesses following operation:
Described molten metal is dropped in described float bath, molten metal accumulates in described float bath by the state being immersed in brick of described end seam each other with molten metal, described drain pan to be cooled and after the bottom outer surface temperature of this drain pan being maintained the management temperature of below the fusing point of tin, supply on described molten metal described melten glass to be shaped described glass ribbon when
The bottom outer surface temperature of described drain pan is remained on higher than described management temperature more than 15 DEG C and be, after the high-temperature-range of less than 200 DEG C, the bottom outer surface temperature of described drain pan is reduced to glass ribbon described in the postforming of specific described management temperature.
2. the manufacture method of float flat glass according to claim 1, wherein,
Described molten metal is tin, by the bottom outer surface of described drain pan is cooled to make the bottom side of described seam lower than the temperature of the fusing point of tin molten tin solidification and temperature treatment at described high-temperature-range, and the bubble that generates from described seam is reduced.
3. the manufacture method of float flat glass according to claim 2, wherein,
Described float bath top cover tectosome covered and the upper space of described molten metal is separated, being full of the non-active gas comprising hydrogen at this upper space, suppressing the generation of bubble.
4. the manufacture method of the float flat glass according to any one in claims 1 to 3, wherein,
There is in the configuration of the bottom outer surface side of described drain pan the blast pipe of the ejiction opening of cooling gas, when carrying cooling gas bottom outer surface to described drain pan to cool via described blast pipe to the bottom outer surface of described drain pan by gas blower, reduce the air capacity sent by described gas blower, and make the temperature of the bottom outer surface of described drain pan remain on described high-temperature-range.
5. the manufacture method of the float flat glass according to any one in Claims 1 to 4, it possesses following operation:
By promoting the speed pulling out described glass ribbon from described molten metal, and change the flowing of the cycling stream generated in described molten metal, the molten metal of the end brick seam be each other paved with described in being immersed in is flowed forcibly.
6. the manufacture method of the float flat glass according to any one in Claims 1 to 4, it possesses following operation:
By changing the thickness of slab of the described glass ribbon when described molten metal pulls out, and promote the pull-out speed of described glass ribbon, and change the flowing of the cycling stream generated in described molten metal, the molten metal of the end brick seam be each other paved with described in being immersed in is flowed forcibly.
7. the manufacture method of the float flat glass according to any one in Claims 1 to 4, it possesses following operation:
Wide by the plate changing the described glass ribbon when described molten metal pulls out, and promote the pull-out speed of described glass ribbon, and change the flowing of the cycling stream generated in described molten metal, the molten metal of the end brick seam be each other paved with described in being immersed in is flowed forcibly.
8. the manufacture method of the float flat glass according to any one in claim 1 ~ 7, wherein, applies vibration to the bottom outer surface of described drain pan.
9. the manufacture method of the float flat glass according to any one in claim 1 ~ 8, wherein,
As described melten glass, use the non-alkali glass representing, have following composition with the quality percentage of oxide compound benchmark:
SiO
2：50～73％、Al
2O
3：10.5～24％、B
2O
3：0～12％、MgO：0～10％、CaO：0～14.5％、SrO：0～24％、BaO：0～13.5％、MgO+CaO+SrO+BaO：8～29.5％、ZrO
2：0～5％。
10. the manufacture method of the float flat glass according to any one in claim 1 ~ 8, wherein,
As described melten glass, use the non-alkali glass representing, have following composition with the quality percentage of oxide compound benchmark:
SiO
2：58～66％、Al
2O
3：15～22％、B
2O
3：5～12％、MgO：0～8％、CaO：0～9％、SrO：3～12.5％、BaO：0～2％、MgO+CaO+SrO+BaO：9～18％。
The manufacture method of 11. float flat glass according to any one of claim 1 ~ 8, wherein,
As described melten glass, use the non-alkali glass representing, have following composition with the quality percentage of oxide compound benchmark:
SiO
2：54～73％、Al
2O
3：10.5～22.5％、B
2O
3：0～5.5％、MgO：0～10％、CaO：0～9％、SrO：0～16％、BaO：0～2.5％、MgO+CaO+SrO+BaO：8～26％。
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| JP2013270209A JP6115466B2 (en) | 2013-12-26 | 2013-12-26 | Method for producing float glass sheet |
| JP2013-270209 | 2013-12-26 |
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| CN109952277A (en) * | 2016-11-14 | 2019-06-28 | Ａｇｃ株式会社 | The manufacturing method of melten glass and the manufacturing method of glass article |
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| CN111439917A (en) * | 2020-04-27 | 2020-07-24 | 河北南玻玻璃有限公司 | Nitrogen gas feeding device for ultra-white float glass production |
| US20230390972A1 (en) * | 2021-01-21 | 2023-12-07 | Tobii Ab | Improvements relating to lenses |
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| KR101347775B1 (en) * | 2009-03-03 | 2014-01-07 | 주식회사 엘지화학 | Float bath system for manufacturing glass |
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| KR20130094335A (en) * | 2010-11-04 | 2013-08-23 | 아사히 가라스 가부시키가이샤 | Method for producing float plate glass and apparatus for producing float plate glass |
| KR101944563B1 (en) * | 2011-08-16 | 2019-01-31 | 에이지씨 가부시키가이샤 | Float glass production device, and float glass production method employing same |
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| JP2007099576A (en) * | 2005-10-06 | 2007-04-19 | Nippon Sheet Glass Co Ltd | Method and apparatus for manufacturing float glass |
| CN101823835A (en) * | 2009-03-03 | 2010-09-08 | 株式会社Lg化学 | Float bath system for manufacturing glass & cooling method of the same |
| CN102686523A (en) * | 2009-08-07 | 2012-09-19 | Lg化学株式会社 | Electrically conductive base plate and a production method for the same |
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| CN109952277A (en) * | 2016-11-14 | 2019-06-28 | Ａｇｃ株式会社 | The manufacturing method of melten glass and the manufacturing method of glass article |
| CN109952277B (en) * | 2016-11-14 | 2021-12-31 | Ａｇｃ株式会社 | Method for producing molten glass and method for producing glass article |
Also Published As
| Publication number | Publication date |
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| CN104743776B (en) | 2018-04-10 |
| JP6115466B2 (en) | 2017-04-19 |
| JP2015124123A (en) | 2015-07-06 |
| KR20150076095A (en) | 2015-07-06 |
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