CN104066689A - Method for manufacturing glass plate and glass plate manufacturing apparatus - Google Patents
Method for manufacturing glass plate and glass plate manufacturing apparatus Download PDFInfo
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- CN104066689A CN104066689A CN201380006297.6A CN201380006297A CN104066689A CN 104066689 A CN104066689 A CN 104066689A CN 201380006297 A CN201380006297 A CN 201380006297A CN 104066689 A CN104066689 A CN 104066689A
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- China
- Prior art keywords
- glass
- frit
- amount
- melten glass
- weight
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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
- C03B5/24—Automatically regulating the melting process
- C03B5/245—Regulating the melt or batch level, depth or thickness
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B17/00—Forming molten glass by flowing-out, pushing-out, extruding or drawing downwardly or laterally from forming slits or by overflowing over lips
- C03B17/06—Forming glass sheets
Abstract
In manufacturing a glass plate, molten glass which is obtained by feeding glass raw material into a melting tank and which is supplied to a forming body through a glass introduction portion from the melting tank is used to form a glass plate by a down-draw method. A draw amount per unit time of the molten glass that is drawn from the melting tank is calculated on the basis of the weight of the formed glass plate. At this point, by setting a target feed amount of the glass raw material per unit time for feeding the glass raw material into the melting tank or by setting a target draw amount per unit time of the molten glass that is drawn from the melting tank on the basis of the calculation results of the draw amount so that the liquid level of the molten glass in the melting tank is positioned within a target range, the feed amount of the glass raw material and the draw amount of the molten glass are matched.
Description
Technical field
The present invention relates to a kind of molten raw and manufacture manufacture method and the manufacturing installation of the sheet glass of sheet glass.
Background technology
In the manufacture method of sheet glass, the frit heating of putting into melting groove is melted and making melten glass.In melting groove, be heated to specific temperature and fully melt after frit, the fairlead that melten glass is melted to groove from being arranged on is drawn, and supplies with the building mortion to sheet glass via clarifying tank, steel basin.In the building mortion of sheet glass, for example, use glass tube down-drawing.Specifically, make melten glass overflow and flow down along the sidewall of the both sides of groove from groove (molding), make the melten glass interflow flowing down and make a slice plate glass.Sheet glass, and is cut off and manufactures sheet glass every specific length by slow cooling in the mode that do not produce strain or warpage.
Herein, in order to make the temperature distribution of melten glass and convectional stability, in order to prevent that melten glass is from melting the liquid bath of groove or clarifying tank overflows and in order to ensure the liquid level of the melten glass steel basin or make melten glass stable from the amount that melts groove and draw, key is, in melting groove, the metal line of melten glass (nux line) (liquid level) is stably maintained to appropriate location.Therefore, the method for position that various precision are measured the metal line of melten glass has well been proposed.
For example, the metal line proofing unit (patent documentation 1) of the melten glass of the metal line level of the melten glass of known detection glass melting groove.
This proofing unit possesses: the member that floats, is immersed in specified quantitative in melten glass and configures, and fluctuate along with the change of the metal line level of melten glass; And feeler mechanism, measure the amount of fluctuating of described unsteady member.As feeler mechanism, for example, use laser displacement gauge.Specifically, in the melting groove in the downstream side in two melting grooves, make buoy (floater) swim in the metal line of melten glass, the variation of the metal line of melten glass is converted to the moving up and down of the shifting axle moving up and down of buoy from moving up and down of buoy, utilize laser displacement gauge to measure moving up and down of this shifting axle.
Background technology document
Patent documentation
Patent documentation 1: Japanese Patent Laid-Open 2008-100889 communique
Summary of the invention
[inventing problem to be solved]
Described method can be improved the environment that arranges of laser displacement gauge, therefore the life-span of laser displacement gauge or maintenance are excellent, but because melting groove in downstream side is measured the position of the metal line of melten glass, because existing as inferior problem: it is large to drop into metal line that frit the makes melten glass time difference (time lag) before rising in the melting groove of upstream side.
And then, in described method, for the axle that moves up and down that makes to be connected with buoy arranges peristome by melting the outside of groove at the top wall that melts groove, therefore the volatile matter of the material of the volatile matter of glass or formation melting groove is being cooled near described peristome and is being attached on described shifting axle, thereby the weight of shifting axle is increased.Countermeasure as this situation, also consider to increase the weight of shifting axle, so that to be attached to the measuring accuracy of metal line of the melten glass affecting on shifting axle stable because of volatile matter, but because increasing the weight of shifting axle, the measuring accuracy of the metal line of melten glass is reduced.
And then, in order to get rid of the impact of the bubble of the metal line that is created in melten glass, and a part for buoy is immersed in melten glass.Therefore yet in flooding the melting groove of this buoy, the viscosity of melten glass is low, the flow velocity of melten glass is fast, is subject to the mobile power of melten glass and cannot fully obtains the measuring accuracy of the metal line position of melten glass.
Therefore, the object of the present invention is to provide and a kind ofly the positional precision that melts the metal line of the melten glass in groove can be adjusted into well to manufacture method and the device for producing glass sheet of the sheet glass in target zone.
[technique means of dealing with problems]
Aspect of the present invention is molten raw and manufacture manufacture method and the device for producing glass sheet of the sheet glass of sheet glass, the aspect of [1]～[9] below having.
[1]
This manufacture method comprises the steps:
Frit is put into and melted in groove and make melten glass;
Use is supplied to the described melten glass of molding via glass introduction part from described melting groove, utilize glass tube down-drawing formed glass sheets;
Weight based on the described sheet glass through being shaped, calculates the amount of drawing of the time per unit of the described melten glass of drawing from described melting groove; And
With the liquid level of the described melten glass in described melting groove, be positioned at the mode of target zone, the result of calculating based on the described amount of drawing, setting is in order to drop into the target input amount of time per unit of the described frit of described frit to described melting groove, or set the target amount of drawing of the time per unit of the described melten glass of drawing from described melting groove, thus, make the input amount of described frit consistent with the amount of drawing described in described melten glass.
[2]
This manufacturing installation comprises:
Melt groove, by input frit, make melten glass;
Building mortion, uses glass tube down-drawing, by the melten glass formed glass sheets of supplying with via glass introduction part from described melting groove; And
Control device, weight based on the described sheet glass through being shaped, calculate the amount of drawing of the time per unit of the described melten glass of drawing from described melting groove, and with the liquid level of the described melten glass in described melting groove, be positioned at the mode of target zone, the result of calculating based on the described amount of drawing, the target input amount of the time per unit of the described frit that setting drops into described melting groove, or set the target amount of drawing of the time per unit of the described melten glass of drawing from described melting groove, thus, make the input amount of described frit consistent with the amount of drawing described in described melten glass.
[3]
According to the manufacture method of the sheet glass [1] Suo Shu or [2] described device for producing glass sheet, wherein, after the described sheet glass that is shaped, also measure the weight of the described sheet glass through being shaped, so that the amount of drawing described in calculating.
[4]
According to the manufacture method of the sheet glass [1] or [3] Suo Shu or [2] or [3] described device for producing glass sheet, the target input amount of wherein said frit is to use frit to become the amount of the yield correction gained of sheet glass.
[5]
According to the manufacture method of the sheet glass [4] Suo Shu or [4] described device for producing glass sheet, wherein said yield comprises scorching hot yield Yd and burning yield Ym,
The frit weight of described scorching hot yield Yd before by the glass weight/melting after melting represents,
Weight when described burning yield Ym all becomes melten glass by (weight when input frit all becomes melten glass-be discharged to the weight outside fusing device)/input frit represents, and
When the weight that becomes the frit of sheet glass in by time per unit is made as Wg, the described target input amount of the time per unit of described frit is obtained by the formula of Wg/ (YdYm).
[6]
According to the device for producing glass sheet described in any one in the manufacture method of the sheet glass [1], [3]～[5] Suo Shu or [2] to [5], wherein in the downstream side of described melting groove, temperature by the described melten glass before lifting formed glass sheets and adjust at least one action in these two actions of port area of described glass introduction part, adjusts described melten glass from the amount of drawing of described melting groove.
[7]
According to the device for producing glass sheet described in any one in the manufacture method of the sheet glass [1], [3]～[6] Suo Shu or [2] to [6], wherein in the downstream side of described melting groove, by the temperature of the described melten glass that flows before lifting formed glass sheets, adjust described melten glass from the amount of drawing of described melting groove in grass tube.
[8]
According to the device for producing glass sheet described in any one in the manufacture method of the sheet glass [1], [3]～[7] Suo Shu or [2] to [7], the amount of drawing of wherein said melten glass is (online) acquisition online in the manufacture of sheet glass.
[9]
According to the device for producing glass sheet described in any one in the manufacture method of the sheet glass [1], [3]～[8] Suo Shu or [2] to [8], wherein said glass substrate is glass substrate for plane display device.
[effect of invention]
In the manufacture method and manufacturing installation of the sheet glass of described aspect, the positional precision that melts the metal line of the melten glass in groove can be adjusted into well target, in scope.
Accompanying drawing explanation
Fig. 1 is the block diagram of manufacture method of the sheet glass of present embodiment.
Fig. 2 is the figure that schematically shows the device of melting step～cut-out step of carrying out shown in Fig. 1.
Fig. 3 carries out the raw material throwing device of input of frit and the summary pie graph of an example of melten glass adjustment System in the melting step of present embodiment.
Fig. 4 is the raw material throwing device of input and another the routine summary pie graph of melten glass adjustment System that carries out frit in the melting step of present embodiment.
Fig. 5 means the figure that the summary of the well heater using in present embodiment forms.
Embodiment
Below, the manufacture method of the sheet glass of present embodiment and manufacturing installation are described.
(the whole summary of the manufacture method of sheet glass)
Fig. 1 is the block diagram of the manufacture method of sheet glass.
The manufacture method of sheet glass mainly comprises: melt step (ST1), clarification steps (ST2), homogenization step (ST3), supplying step (ST4), forming step (ST5), slow cooling step (ST6), cut off step (ST7) and set step (ST8).In addition, comprise grinding and cut step, grinding steps, cleaning step, inspection step, bale packing step etc., in bale packing step the multi-disc sheet glass of institute's lamination by conveyance the operating personnel to order party.
The manufacture method of the sheet glass of present embodiment comprises the steps: frit to put into melting groove and make melten glass; Utilize glass tube down-drawing, use the melten glass that is supplied to molding via glass introduction part from this melting groove to carry out formed glass sheets; The weight of the sheet glass based on through being shaped, calculates the amount of drawing of the time per unit of the melten glass of drawing from melting groove; And the mode that is positioned at target zone to melt the liquid level of the described melten glass in groove, the result of calculating based on the amount of drawing, setting is in order to the target input amount of the time per unit of the frit to melting groove input frit, or set the target amount of drawing of the time per unit of the melten glass of drawing from melting groove, thus, make the input amount of frit and the amount of drawing of melten glass consistent.
Herein, in described melting step ST1, comprise frit is put into the step that melts groove and make melten glass.In forming step ST5, comprise the step of using melten glass shaping plate glass.In setting step ST8, comprise and setting in order to drop into the step of target input amount of time per unit of the frit of frit to melting groove, or comprise and setting in order to draw the step of the target amount of drawing of time per unit of the melten glass of melten glass from melting groove.With respect to the target input amount of setting the time per unit of the frit setting in step ST8, actual input amount as shown in Figure 1, by melting step ST1 feedback control.When intermittently dropping into frit, by changing the input amount of each input or dropping into interval and adjust.On the other hand, when continuous input, by changing for example revolution of the continuous input machines such as spiral charger (screwfeeder), adjust.Or as shown in phantom in Figure 1, with respect to the target amount of drawing of setting the time per unit of the melten glass setting in step ST8, the amount of drawing of actual time per unit, by supplying step ST4 feedback control, is adjusted the amount of drawing of the time per unit of melten glass.
Fig. 2 is the figure that schematically shows the device for producing glass sheet that melts step (ST1)～cut-out step (ST7).As shown in Figure 2, this device mainly has fusing device 100, building mortion 200 and shut-off device 300.Fusing device 100 has the groove 101 of melting, clarifying tank 102, steel basin 103 and grass tube 104,105,106.
In melting step (ST1), by using not shown flame and any in electrode heats melting to being supplied to the frit melting in groove 101, and making melten glass.With regard to the viewpoint of energy efficiency, be preferably by least using the energising heating of electrode to melt frit.
In melting step, for example, use scraper bowl (bucket) that frit is supplied to and melts groove 101.According to the input amount of the time per unit of the frit setting, control example, as put into the weight of frit of scraper bowl or start time of charger etc. at every turn, is supplied with frit in this way.The method that frit is supplied to melting groove 101 is not limited to scraper bowl, also can utilize charger directly frit to be supplied to and melt groove 101.
Clarification steps (ST2) is mainly carried out in clarifying tank 102 and the upstream side of clarifying tank 102 or the grass tube in downstream side 104 and grass tube 105.By the melten glass MG in clarifying tank 102, heat, in melten glass MG, contained bubble is grown up and is floated to liquid level because of the redox reaction of finings and discharges, or the gaseous constituent in bubble is absorbed and bubble collapse in melten glass.
In homogenization step (ST3), by using agitator to stir the melten glass MG in the steel basin 103 of supplying with by grass tube 105, and carry out homogenizing of glass ingredient.
In supplying step (ST4), adjust melten glass MG via grass tube 106 and the amount supplied with to building mortion 200 as grass tube 106 and the glass introduction part (not shown) of the connecting portion of molding, melten glass MG is supplied to building mortion 200.The feed rate of so-called melten glass MG is the weight of time per unit that is supplied to the melten glass MG of building mortion 200.
Form and melt groove 101 in the fusing device 100 of grass tube 106, with melten glass MG along with gravity forms stream towards the naturally mobile mode of grass tube 106, therefore the flow of the time per unit of melten glass MG in the grass tube 106 being connected with building mortion 200 by adjustment, and the actual amount of drawing of the time per unit of the melten glass MG that adjustment is drawn from melting groove 101.That is to say, by adjusting the flow of the time per unit of melten glass MG in grass tube 106, and adjust the actual amount of drawing of the time per unit of the melten glass MG drawing from melting groove 101.Herein, about the flow of the time per unit of melten glass MG in grass tube 106, the temperature (lifting temperature) that can pass through the melten glass MG of grass tube 106 by adjustment is adjusted described flow.That is to say, in the downstream side that melts groove 101, by lifting, manufacture before sheet glass in the temperature of the interior mobile melten glass MG of grass tube 106, adjust the actual amount of drawing of melten glass MG.Specifically, in order to increase from melting the amount of drawing of groove 101, and improve be arranged on grass tube 106 well heater 106a around add heat (electric currents that circulation is many), thereby improve the temperature at the interior mobile melten glass MG of grass tube 106, reduce thus the viscosity of melten glass MG, make the flow velocity of melten glass MG increase.Therefore, the melten glass MG of viscosity increases to the feed rate of building mortion 200.On the other hand, in order to suppress from melting the amount of drawing of groove 101, and reduce well heater 106a add heat (few electric current circulates), thereby reduce the temperature of melten glass MG, improve thus the viscosity of melten glass MG, the flow velocity of melten glass MG is declined.Therefore the melten glass MG that, viscosity uprises reduces to the feed rate of building mortion 200.The action that this kind adjusted the temperature of melten glass MG is suitably carried out the shaping in forming step ST5, and carries out in the scope that can not impact the quality of the sheet glass as end article.
In addition, except use well heater 106a heating grass tube 106 also utilizes the mode of the temperature that adds heat adjustment melten glass MG now, also can use the mode that the energising of grass tube 106 own is heated and utilize the temperature that adds heat adjustment melten glass MG now.
And, for example also can by control, be arranged on the port area of grass tube 106 and the glass introduction part of the connecting portion of molding, adjust from melting the actual amount of drawing of the time per unit of the melten glass MG that groove 101 draws.
In building mortion 200, form step (ST5) and slow cooling step (ST6).
In forming step (ST5), melten glass MG is configured as to plate glass SG, form flowing of plate glass SG.In the present embodiment, utilize the overflow downdraw of using not shown molding.In slow cooling step (ST6), in addition cooling to reach desired thickness through the plate glass SG being shaped and drawn downwards and not produce the mode of internal strain.
In cutting off step (ST7), by shut-off device 300, the plate glass SG supplying with is cut into length-specific, and obtain sheet glass from building mortion 200.
Sheet glass through cutting off and then be cut off into specific dimensions, makes the sheet glass of target size.Afterwards, glass end face is ground and cuts, grinds, and glass interarea is cleaned, and then have or not after the abnormal defects such as bubble in inspection, using the sheet glass of passed examination product as end article, carry out bale packing.In addition, the sheet glass Weight-measuring device 404 (with reference to Fig. 3) that is arranged on the downstream of shut-off device by utilization is measured the weight of whole sheet glass, and calculates the actual amount of drawing of melten glass.
Below, as present embodiment, following methods is described, and the method comprises the steps: frit to put into and melt groove 101 and making melten glass MG; From this melting groove 101, take out melten glass MG and manufacture sheet glass; And the mode that is positioned at target zone to melt the metal line of the melten glass MG in groove 101, set the target input amount in order to the time per unit of the frit to melting groove 101 inputs.
(adjusting the input amount of frit)
Fig. 3 is the pie graph of summary of raw material throwing device 110 that carries out the input of frit in melting step ST1.In the present embodiment, enumerating situation about intermittently dropping into is that example describes.
Raw material throwing device 110 is as lower device: by frit being put into scraper bowl, and this scraper bowl is being melted to the interior movement of groove 101 upset, and frit is being put into the melten glass MG melting in groove 110.Raw material throwing device 110 has crowd formula load hopper (batch hopper) 110a, cullet hopper (cullet hopper) 110b, spiral charger 110c, vibration charger 110d, batch bin (batch bin) 110e, load cell (load cell) 110f, outer cover 110g and scraper bowl 110h.In Fig. 3, except raw material throwing device 110, also show the formation of melten glass adjustment System 400.Melten glass adjustment System 400 has frit measuring apparatus 402, sheet glass Weight-measuring device 404 and control device 406.
Criticize formula load hopper 110a and store raw materials such as becoming the silica of frit or lime.Cullet hopper 110b store to pulverize sheet glass etc. and the glass powder that forms etc. become the glass cullet of frit.Spiral charger 110c has the not shown spirochete of supplying with frit from crowd formula load hopper 110a, by making this spirochete rotation, frit is supplied to batch bin 110e.Vibration charger 110d has the vibrating mechanism of supplying with frit from cullet hopper 110b, by the vibration of vibrating mechanism, from vibration charger 110d, frit is supplied to batch bin 110e.
By the control signal of control device 406, control spiral charger 110c and the action of vibrating charger 110d.
Batch bin 110e concentrates frit be supplied to the part of scraper bowl 110h.
Frit outer cover 110g is set above batch bin 110e so that can not disperse.In the bottom surface of batch bin 110e, arrange in order to measure the load cell 110f of the weight of frit.The information of the weight of the frit of being measured by load cell 110f is transported to measuring apparatus 400.
Measuring apparatus 400 is according to the information of the weight of the frit of carrying from each load cell 110f, obtains and wants the weight that is supplied to batch bin 110e and then wants to be supplied to the frit of scraper bowl 110h.The weight of acquired frit is transported to control device 406.
And, as shown in Figure 2, utilize sheet glass Weight-measuring device 404 to measure through shut-off device 300 and cut off and become the weight that sheet glass (below be referred to as the sheet glass of having manufactured) is removed in the sheet glass of end article and the cut-out of sheet glass.The weight of measuring the sheet glass gained of having manufactured is transported to control device 406.The weight of measuring sheet glass (sheet glass is removed in the sheet glass of end article and the cut-out) gained of having manufactured is roughly equivalent to the amount of drawing of melten glass.Control device 406 uses these weight of measuring to obtain the information of the actual amount of drawing of the melten glass of time per unit.So, in the present embodiment, can use sheet glass Weight-measuring device 404 in the manufacture of sheet glass, to obtain online the information of the actual amount of drawing of melten glass.
The information of the actual amount of drawing of the melten glass of the time per unit that control device 406 uses are obtained, to melt the liquid level of the melten glass in groove 101, be positioned at the mode of target zone, set the target input amount in order to the time per unit of the frit to melting groove 101 input frits.Control device 406 is according to the target input amount of the time per unit of the frit setting, regulation is put into the input amount (weight) of the frit of scraper bowl 110h at every turn, and the frit of this amount is supplied to the mode of batch bin 110e, control the action of spiral charger 110c, vibration charger 110d.The frit of putting into batch bin 110f is provided for scraper bowl 110h.
Control device 406 is for example stipulated the target input amount of the time per unit of frit in the consistent mode of the weight W d of the sheet glass with time per unit manufacture, and according to the target input amount of this time per unit, sets the input amount (weight) of the frit of putting into scraper bowl 110h.Control device 406 produces control signal according to the information of the weight setting, control device 406 flows to this control signal the not shown drive unit of spiral charger 110c, vibration charger 110d, control the action of spiral charger 110c, vibration charger 110d, thus, control the weight of the frit of putting into scraper bowl 110h.Control device 406 is for example made as the weight W d of the sheet glass of time per unit manufacture fixing, and according to this weight W d, sets the target input amount of the time per unit of frit.
The weight of the sheet glass of more preferably, time per unit being manufactured is stipulated the target input amount for the time per unit of frit divided by the value of fixing ratio gained.In this situation, fixing ratio is preferably the yield that frit becomes sheet glass.Input frit does not all become the sheet glass of manufacturing, and a part is volatilized etc.Therefore, the input amount of frit is preferably the amount that the yield shown in using below (scorching hot yield Yd, burning yield Ym) is revised gained.
The weight W d of the sheet glass of time per unit manufacture is consistent with the amount of drawing of the melten glass MG that time per unit is drawn from melting groove 101, and utilizes sheet glass Weight-measuring device 404 to measure.About weight W d, in can be during fixing, with once above number of times, measure the weight of the sheet glass (sheet glass is removed in the sheet glass of end article and cut-out) of having manufactured, calculate their mean value, but the weight of the sheet glass that will manufacture through time change step in, be preferably all wts of the sheet glass that mensuration manufactured, with their total, calculate weight W d.In addition, wanting artificially to change the amount of drawing (weight) of the melten glass MG that time per unit draws, while being the weight of sheet glass of time per unit manufacturing, be preferably to the observed value of the weight of the sheet glass of nearest manufacture be multiplied by time per unit sheet glass manufacture sheet number and calculate, and not use the mean value of the weight of measuring the sheet glass gained of having manufactured.Certainly, be maintained at the mode of the value setting with the input amount of the frit of time per unit, the input amount of the frit based on utilizing load cell 110f to measure is carried out feedback control.
Below, the setting of the input amount of frit is described particularly.
About utilizing each input amount of the frit of scraper bowl 110h, if time per unit is dropped into the weight of frit, be made as W1 (kg weight/time), use the input amount (kg heavy) of each frit of scraper bowl 110h to become W1/ and drop into number of times (inferior/time).
Herein, even if frit not only comprises the composition that melts silica sand that melting weight also can not change and so on, and comprise carbonate or nitrate or hydrate and so on pass through at high temperature decompose and when making melten glass, emit gas and composition that weight changes.Therefore, in order to calculate original frit, melt and become how many glass sheets, being preferably the scorching hot yield Yd of the frit that is multiplied by actual input.The weight of the original frit of scorching hot yield Yd before by the glass weight/melting after melting is stipulated.As long as do not change kind (one-tenth component) and the allotment ratio of frit, this scorching hot yield Yd is for fixing.And scorching hot yield Yd can be by calculating and obtain according to the kind of the frit using, composition and allotment ratio, and, in addition actual measurement and obtaining of melting also can in laboratory, be tested in advance.
And then in melting groove 101, the melten glass of being made by input frit not all obtains as sheet glass, but adulterate with the waste gas of combustion gases in melting groove 101, produce and be discharged to the composition outside stove with dust or with volatile component.This ratio is called to burning yield Ym.Burning yield Ym stipulates as follows.
Burning yield Ym=(weight when input frit all becomes melten glass-be discharged to the weight outside fusing device)/(weight when input frit all becomes melten glass)
Burning yield Ym can change a little because of the suction pressure of combustion method or glass melting temperature or waste gas etc., but as long as these conditions are maintained in the scope of common combustion management, just can be considered fixing.By calculating according to the information of the weight of the weight of input frit of set time, derivative melten glass (weight of the sheet glass of having manufactured) and the variation of metal line therebetween, and calculate burning yield Ym.
Therefore the weight W g that, time per unit is put into the frit that melts groove 101 and become sheet glass calculates according to formula below.
Wg (kg weight/time)=W1YdYm
Therefore, according to Wg/ (YdYm), calculate weight W 1.YdYm is less than 1, so weight W 1 is greater than weight W d.Weight W g for example stipulates in the consistent mode of the weight W d of the sheet glass with time per unit manufacture.The weight W 1 of obtaining is like this target input amount.
Be the mode that the metal line that melts the melten glass in groove 101 is positioned at target zone above, set in order to the explanation of mode of target input amount to melting the time per unit of the frit that groove 101 drops into.In addition, scorching hot yield also can be used computer simulation (computer simulation) to obtain.And burning yield also can be used computer simulation to obtain.In computer simulation, can be made into the three-dimensional model of the structure that comprises glass and device etc., this three-dimensional model is made as to resolution areas and obtains scorching hot yield or burning yield.
Next, following methods is described, the method comprises the steps: frit to put into and melt groove 101 and making melten glass MG; From this melting groove 101, take out melten glass MG and manufacture sheet glass; And the mode that is positioned at target zone to melt the metal line of the melten glass MG in groove 101, the target amount of drawing of the time per unit of the melten glass MG that setting is drawn from melting groove 101.
(adjusting the amount of drawing of melten glass MG)
Fig. 4 means to adjust the formation picture of device of the amount of drawing of melten glass MG.Fig. 5 means the summary pie graph for grass tube 106 well heater 106a around.Device shown in Fig. 4 forms the discrepancy forming with the device shown in Fig. 3 and is to be provided with and draws setting device 408.Be identical formation in addition, therefore description thereof is omitted.Draw setting device 408 and be the amount of drawing of melten glass of the unit time based on carrying from control device 406 and the setting device of the heating of control heater 106a.
Control device 406 is for example with the input amount (weight) of the frit that drops into time per unit or to be preferably the input amount of considering described yield and revising the frit gained that time per unit drops into be the amount of drawing of the time per unit of the consistent mode regulation melten glass MG of weight W g, and according to this amount of drawing, carry out the control of the Heating temperature of the well heater 106a shown in Fig. 2.The viscosity of melten glass MG changes with this Heating temperature, therefore melten glass MG can be controlled leading to the flow of unit time mobile in a series of pipe of grass tube 106 from melting groove 101, the time per unit weight of the sheet glass that utilizes glass tube down-drawing manufacture can be controlled.That is to say, the melten glass MG that can control to manufacture sheet glass is from melting the amount of drawing of groove 101.
As shown in Figure 5, at the covering well heater 106a of surrounding of grass tube 106, setting device 408 is drawn in use to be made to change in the temperature of the interior mobile melten glass MG of grass tube 106, thereby can adjust according to this temperature variation the amount of drawing of melten glass MG.The action of this kind of adjustment amount of drawing is to produce the setting signal corresponding with the amount of drawing setting by control device 406, and this setting signal is flowed to and draws setting device 408.Draw setting device 408 and according to this setting signal, adjust the Heating temperature of well heater 106a.
The adjustment of the amount of drawing of the time per unit of the melten glass MG drawing from melting groove 101 in addition, is not limited to the adjustment of described Heating temperature.Also can by plunger mode or be arranged on glass introduction part weir plate move up and down the port area of adjusting glass introduction part.And then, described in adjustment the amount of drawing also can by adjust glass introduction part port area, with adjust the combination of melten glass temperature and carry out.In addition, the adjustment of melten glass temperature is preferably after whipping step and before forming step and carries out.
The amount of drawing of adjusting the feed rate of described frit and adjusting melten glass MG also can form Fig. 3,4 device to concentrate in a device carries out simultaneously.That is to say, can the adjustment of the input amount of frit is set and to be maintained the mode of certain target value, carry out feedback control on one side, Yi Bian adjust the amount of drawing of melten glass MG.And, can the adjustment of the amount of drawing of melten glass MG is maintained to the mode of certain target value, carry out feedback control on one side, Yi Bian adjust the input amount of frit.And, also can make the feed rate of the frit of current time per unit move to certain target value simultaneously, and the amount of drawing of the melten glass of current time per unit is moved to certain target value.
For the metal line that melts the melten glass MG in groove 101 is remained fixing, and in the mode of weight W g=weight W d, according to the amount of drawing of the time per unit of melten glass MG, set the input amount of the time per unit of the frit that will drop into, or according to the input amount of the time per unit of the frit that will drop into, set the amount of drawing of the time per unit of melten glass.
And the weight W gl (kg weight/mm) of the melten glass of the variable quantity corresponding to liquid level 1mm in the liquid bath of melting groove 101 can easily calculate according to the schema that melts groove 101.Therefore, in the situation that the liquid level that melts the melten glass MG in groove 101 is only made as to X mm, spends Y hour and make it to rise, in order to meet Wg-Wd=WglX/Y, control device 406 changes weight W d or fixed weight Wd and changes weight W g or change weight W d and the mode of weight W g is controlled simultaneously with fixed weight Wg.
In addition, in melting groove 101, with regard to producing the aspect of stable melten glass MG, be preferably the weight W g of the frit that makes time per unit input, be the amount of drawing of fixing and adjust the melten glass MG of time per unit.In the situation that the frit dropping into is changed, also must make the heat (combustion gas flow, electric power) that adds that melts groove 101 change, even and if then adjustment adds heat, during before mobile the stablizing of melten glass MG in melting groove 101, also can cause detrimentally affect to the quality of sheet glass, thereby cannot manufacture expeditiously sheet glass.
In addition, in forming step, slow cooling step, in the situation that change weight W d in the strict sheet glass of quality bills of materials, change is supplied to the viscosity of the melten glass MG of building mortion 200, therefore, in forming step, slow cooling step, the quality of sheet glass likely reduces.In such cases, do not change weight W d and change weight W g.
Even if in the situation that the object that will change is weight Wg, weight W d any, if weight W g, weight W d are sharply changed, also have deterioration because of the quality of sheet glass and cause yield to reduce or depart from the tabular situation about temporarily stopping that cutting that specification causes cutting off step ST7 because of the quality of sheet glass.Therefore, be preferably weight Wg, the weight W d separate provision upper limit and use.
In the present embodiment, in the situation that the liquid level that melts the melten glass MG in groove 101 is only made as to X mm, spends Y hour and make it to rise, in order to meet Wg-Wd=WglX/Y, control device 406 can be in ratio control (P control) mode, also can adjust weight W g or weight W d with PID (proportional integral differential, proportion integration differentiation) control mode.
(frit, glass form)
The manufacture method of the sheet glass of present embodiment can be applicable to the manufacture of all sheet glass, be particularly suited for the glass substrate for plane display devices such as liquid crystal indicator, organic EL (Electroluminescence, electroluminescence) display unit or plasma display apparatus.Or also can be applied to manufacture the cover glass that covers display part.
While manufacturing sheet glass according to the manufacture method of the sheet glass of present embodiment, to become the mode of required glass composition, modulate frit.For example, in the situation that manufacturing glass substrate for plane display device, be preferably to have the mode mixing raw material of following composition.
(a) SiO
2: 50～70 quality %,
(b) B
2o
3: 5～18 quality %,
(c) Al
2o
3: 10～25 quality %,
(d) MgO:0～10 quality %,
(e) CaO:0～20 quality %,
(f) SrO:0～20 quality %,
(o) BaO:0～10 quality %,
(p) RO:5～20 quality % (wherein, R is at least one being selected from Mg, Ca, Sr and Ba, contained composition in sheet glass),
(q) R '
2o: surpass 0.10 quality % and 2.0 quality % following (wherein, R ' is for to be selected from least one in Li, Na and K, contained alkali metal component in sheet glass),
(r) add up at least one metal oxide in stannic oxide, ferric oxide and cerium oxide etc. that is selected from of 0.05～1.5 quality %.
In addition, (q) R '
2o is also nonessential, therefore also can not contain.In this situation, become in fact not containing R '
2the non-alkali glass of O, thus R ' can be reduced
2o flows out and is formed on characteristic deteriorated of the TFT (Thin Film Transistor, thin film transistor) the glass substrates such as liquid crystal panel of liquid crystal indicator from sheet glass.On the other hand, by firmly containing, surpass 0.10 quality % and (q) R ' below 2.0 quality %
2o, can suppress the thermal expansion of the deteriorated or glass of TFT characteristic within the specific limits, and improve the basicity of glass, easily carries out the oxidation of the metal that valence mumber can change, and improves clarification property.And then, can make the ratio resistance of glass reduce, be therefore adapted at melting and in groove 101, carry out electric melting.
And the glass substrate for plane display devices such as liquid-crystal display or OLED display are strict especially to the requirement of bubble, therefore, as (r) metal oxide, be preferably the stannic oxide at least containing as finings performance function.
Described glass substrate for plane display device is preferably in fact not containing As
2o
3, more preferably in fact not containing As
2o
3and Sb
2o
3.That is to say, even if contain these materials, these materials are also as impurity, and specifically, these materials are preferably and comprise As
2o
3, and Sb
2o
3such oxide compound interior be below 0.1 quality %.
Except described composition, the glass using in present embodiment also can contain various other oxide compounds, to regulate various physical properties, melting, the clarification of glass and the characteristic being shaped.As the example of described other oxide compounds, be not limited to below, can enumerate TiO
2, MnO, ZnO, Nb
2o
5, MoO
3, Ta
2o
5, WO
3, Y
2o
3, and La
2o
3.
In the present embodiment, control device 406 is positioned at the mode of target zone to melt the liquid level of the melten glass MG in groove 101, sets the target input amount in order to the time per unit of the frit to melting groove 101 input frits.Or control device 406 is set the target amount of drawing of the time per unit of the melten glass MG drawing from melting groove 101.Thus, make actual input amount consistent with the actual amount of drawing.
Therefore, can by melt the melten glass MG in groove 101 metal line position all the time precision be adjusted into well the position in target zone.Therefore, the metal line that can suppress melten glass MG changes, and contacts and the composition of stove material is flowed out from metal line with the wall of new melting groove 101.And, because the variation of metal line is suppressed, therefore melt the convectional stability of the melten glass MG in groove 101, easily generate the melten glass MG of homogeneous.
In the input amount of the frit mode consistent with the amount of drawing of melten glass MG, set the target amount of drawing of melten glass MG or the target input amount of frit, therefore can the position that melt the metal line of the melten glass MG in groove 101 be maintained fixing.
In the present embodiment, the target input amount of frit is the amount that the yield (scorching hot yield, burning yield Ym) that uses frit to become sheet glass is revised gained, therefore can precision controls better the position of the metal line of melten glass MG.
[embodiment, comparative example]
(embodiment)
Device shown in Fig. 3 and Fig. 4 is formed and focused in a device, to use the input amount of time per unit of frit and the weight W g mode consistent with weight W d that yield (scorching hot yield Yd=0.918, burning yield Ym=0.995) is obtained, predetermined weight Wg and weight W 1 also drop into frit.Now, the amount of drawing with melten glass MG becomes the feedback control that fixing mode is carried out the Heating temperature of well heater 106a.In feedback control, with two hours frequency once, contrast the on average amount of drawing of nearest melten glass MG hourly, poor with the target amount of drawing, and according to this comparative result, carry out the feedback control of the Heating temperature of well heater 106a.
Its result is that the position of the metal line of the melten glass MG of melting groove 101 can maintain in the scope with respect to the position ± 1mm of target metal line.In addition, utilize the height that is arranged on the laser light reflective metal line meter continuous automatic measurement of electric furnace and draws metal line.
(comparative example)
Based on utilization, be arranged on the position of metal line of melten glass MG of melting groove 101 of the reflective metal line meter of the laser light continuous automatic measurement gained of electric furnace, in the situation that the position of the position deviation target metal line of metal line, in order to revise this deviation, operator adjust the input amount of the time per unit of frit, and utilize the device for producing glass sheet shown in Fig. 2 to manufacture sheet glass.Its result is, the position of the metal line of melten glass MG at the position ± 3mm of the target metal line with respect to melten glass MG with interior change.
Even if in the situation that adjust the amount of drawing of melten glass MG, when using the device shown in Fig. 2 to form to manufacture sheet glass, the position of the metal line of melten glass MG is also that position ± 3mm at the target metal line with respect to melten glass MG is with interior change.
According to the above, the effect of present embodiment is clear and definite.
Above, the manufacture method of sheet glass of the present invention and manufacturing installation are at length illustrated, but the present invention is not limited to described embodiment and described embodiment, can certainly without departing from the spirit and scope of the invention, carry out various improvement or change.
[explanation of symbol]
100 fusing devices
101 melt groove
102 clarifying tanks
103 steel basins
103a agitator
104,105,106 grass tubes
106a well heater
110 raw material throwing devices
110a criticizes formula load hopper
110b cullet hopper
The spiral charger of 110c
110d vibrates charger
110e batch bin
110f load cell
110g outer cover
110h scraper bowl
200 building mortions
300 shut-off devices
400 melten glass adjustment System
402 frit measuring apparatuss
404 sheet glass Weight-measuring devices
406 control device
408 draw setting device
Claims (7)
1. a manufacture method for sheet glass, is characterized in that: molten raw and manufacture sheet glass, and comprise the steps:
Frit is put into and melted in groove and make melten glass;
Utilize glass tube down-drawing, use the described melten glass that is supplied to molding via glass introduction part from described melting groove to carry out formed glass sheets;
Weight based on the described sheet glass through being shaped, calculates the amount of drawing of the time per unit of the described melten glass of drawing from described melting groove; And
With the liquid level of the described melten glass in described melting groove, be positioned at the mode of target zone, the result of calculating based on the described amount of drawing, setting is in order to drop into the target input amount of time per unit of the described frit of described frit to described melting groove, or set the target amount of drawing of the time per unit of the described melten glass of drawing from described melting groove, thus, make the input amount of described frit consistent with the amount of drawing described in described melten glass.
2. glass plate manufacturing method according to claim 1, wherein
After the step of described sheet glass that is shaped, also comprise the steps: to measure the weight of the described sheet glass through being shaped, with the amount of drawing described in calculating.
3. the manufacture method of sheet glass according to claim 1 and 2, wherein
The target input amount of described frit is to use frit to become the amount of the yield correction gained of sheet glass.
4. the manufacture method of sheet glass according to claim 3, wherein
Described yield comprises scorching hot yield Yd and burning yield Ym,
The frit weight of described scorching hot yield Yd before by the glass weight/melting after melting represents,
Weight when described burning yield Ym all becomes melten glass by (weight when input frit all becomes melten glass-be discharged to the weight outside fusing device)/input frit represents, and
In the situation that the weight that becomes the frit of sheet glass in time per unit is made as to Wg, the described target input amount W1 of the time per unit of described frit is obtained by the formula of Wg/ (YdYm).
5. according to the manufacture method of the sheet glass described in any one in claim 1 to 4, wherein
Downstream side at described melting groove, temperature by the described melten glass before lifting formed glass sheets and adjust at least arbitrary action in these two actions of port area of described glass introduction part, adjusts described melten glass from the amount of drawing of described melting groove.
6. according to the manufacture method of the sheet glass described in any one in claim 1 to 5, wherein
In the downstream side of described melting groove, by the temperature of the described melten glass that flows before lifting formed glass sheets, adjust described melten glass from the amount of drawing of described melting groove in grass tube.
7. a device for producing glass sheet, is characterized in that: molten raw and manufacture sheet glass, and comprise:
Melt groove, by input frit, make melten glass;
Building mortion, uses glass tube down-drawing, by the melten glass formed glass sheets of supplying with via glass introduction part from described melting groove; And
Control device, weight based on the described sheet glass through being shaped, calculate the amount of drawing of the time per unit of the described melten glass of drawing from described melting groove, and with the liquid level of the described melten glass in described melting groove, be positioned at the mode of target zone, the result of calculating based on the described amount of drawing, the target input amount of the time per unit of the described frit that setting drops into described melting groove, or set the target amount of drawing of the time per unit of the described melten glass of drawing from described melting groove, thus, make the input amount of described frit consistent with the amount of drawing described in described melten glass.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012-285789 | 2012-12-27 | ||
| JP2012285789 | 2012-12-27 | ||
| PCT/JP2013/084884 WO2014104190A1 (en) | 2012-12-27 | 2013-12-26 | Method for manufacturing glass plate and glass plate manufacturing apparatus |
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| Publication Number | Publication Date |
|---|---|
| CN104066689A true CN104066689A (en) | 2014-09-24 |
| CN104066689B CN104066689B (en) | 2016-08-24 |
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| CN201380006297.6A Active CN104066689B (en) | 2012-12-27 | 2013-12-26 | The manufacture method of glass plate and device for producing glass sheet |
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|---|---|
| JP (1) | JP5851596B2 (en) |
| CN (1) | CN104066689B (en) |
| TW (1) | TWI519498B (en) |
| WO (1) | WO2014104190A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105837008A (en) * | 2016-06-01 | 2016-08-10 | 东旭科技集团有限公司 | Overflow process glass production line and automatic control system and method thereof |
| CN107807514A (en) * | 2017-10-12 | 2018-03-16 | 彩虹集团（邵阳）特种玻璃有限公司咸阳分公司 | A kind of cover-plate glass draws amount control method |
| CN111580473A (en) * | 2020-04-10 | 2020-08-25 | 彩虹集团有限公司 | Method for automatically controlling glass extraction amount of liquid crystal substrate |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104609700A (en) * | 2015-01-09 | 2015-05-13 | 安徽盛世新能源材料科技有限公司 | Automatic color material input device for producing colored crystal board |
| JP6674138B2 (en) * | 2016-05-12 | 2020-04-01 | 日本電気硝子株式会社 | Glass plate manufacturing apparatus and glass plate manufacturing method |
| KR102342482B1 (en) | 2016-08-24 | 2021-12-24 | 코닝 인코포레이티드 | Glass manufacturing apparatus and method |
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- 2013-12-26 CN CN201380006297.6A patent/CN104066689B/en active Active
- 2013-12-26 WO PCT/JP2013/084884 patent/WO2014104190A1/en active Application Filing
- 2013-12-26 JP JP2014514646A patent/JP5851596B2/en active Active
- 2013-12-27 TW TW102148855A patent/TWI519498B/en active
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| CN105837008B (en) * | 2016-06-01 | 2019-07-09 | 东旭科技集团有限公司 | Press over system glass production line and its automatic control system and method |
| CN107807514A (en) * | 2017-10-12 | 2018-03-16 | 彩虹集团（邵阳）特种玻璃有限公司咸阳分公司 | A kind of cover-plate glass draws amount control method |
| CN111580473A (en) * | 2020-04-10 | 2020-08-25 | 彩虹集团有限公司 | Method for automatically controlling glass extraction amount of liquid crystal substrate |
Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2014104190A1 (en) | 2017-01-19 |
| CN104066689B (en) | 2016-08-24 |
| TW201425249A (en) | 2014-07-01 |
| WO2014104190A1 (en) | 2014-07-03 |
| JP5851596B2 (en) | 2016-02-03 |
| TWI519498B (en) | 2016-02-01 |
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