CN102822104A - Glass plate production method - Google Patents
Glass plate production method Download PDFInfo
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- CN102822104A CN102822104A CN2012800009895A CN201280000989A CN102822104A CN 102822104 A CN102822104 A CN 102822104A CN 2012800009895 A CN2012800009895 A CN 2012800009895A CN 201280000989 A CN201280000989 A CN 201280000989A CN 102822104 A CN102822104 A CN 102822104A
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Abstract
Provided is a glass plate production method that makes the plate thickness of a sheet glass as uniform as possible and is capable of reducing warpage and strain. Said method is a glass plate production method using the downdraw method and comprises: a molding step in which molten glass is caused to flow down along both side surfaces of a molding body and the sheet glass is molded by causing the molten glass to merge in the lower section of the molding body; and a cooling step in which the sheet glass is cooled while being pulled downwards by a roller. A glass strain point upper temperature control step is performed in the cooling step, said step including: a first temperature control step, being a step in which temperature control is performed in the sheet glass width direction, in a temperature region from the bottom section of the molding body up to where the temperature is below that of a temperature region in the vicinity of the glass strain point, such that the end sections in the width direction of the sheet glass are made to have a lower temperature than the central region sandwiched by the end sections and the temperature in the central section becomes uniform; a second temperature control step in which the temperature in the width direction of the sheet glass reduces from the central section towards the end sections; and a third temperature control step in which the temperature gradient between the end sections and the central region in the width direction of the sheet glass in the temperature region in the vicinity of the glass strain point is eliminated.
Description
Technical field
The present invention relates to a kind of method of manufacture of sheet glass.
Background technology
Like institute's record in the patent documentation 1 (Japanese Patent Laid is opened the 2004-115357 communique), there is the method for use glass tube down-drawing manufacturing sheet glass.Glass tube down-drawing is to make after melten glass flows in the molding, makes the top overflow of this melten glass from molding.The melten glass of overflow flows down along the two sides of molding, and in the interflow, bottom of molding, processes flat glass (sheet glass) by this.Thereafter, utilize roller with sheet glass to stretched, and cut into length-specific.
Summary of the invention
Invent problem to be solved
The invention that is disclosed in the patent documentation 1 is in specific temperature province, the central part and near the thermograde the terminal part of the width of sheet glass to be made as particular value, reduces the residual stress of sheet glass by this.In addition, the invention that is disclosed in the patent documentation 1 is to consider the residual stress of sheet glass or strain and the central part of regulation sheet glass and near the thermograde of terminal part.
But patent documentation 1 fails to realize that one side makes the thickness of slab homogenizing of sheet glass, and one side reduces the warpage and the strain of sheet glass.
Therefore, problem of the present invention is to provide a kind of and can does one's utmost to make the thickness of slab of sheet glass even, can reduce the method for manufacture of the sheet glass of warpage and strain (residual stress) simultaneously.
The means of dealing with problems
The method of manufacture of sheet glass of the present invention is utilized glass tube down-drawing, and possesses forming step and cooling step.Forming step is to flow down by the two sides that make melten glass along molding, and in the interflow, bottom of molding, and be configured as sheet glass.Cooling step be the one side utilize roller with sheet glass to stretched, the one side cool off.In cooling step, carry out strain point of glass top temperature controlling step.Strain point of glass top temperature controlling step is in the temperature province till near the temperature province that is lower than the strain point of glass of the bottom of molding; The step that the temperature of the width of sheet glass is controlled, and comprise the 1st temperature controlling step, the 2nd temperature controlling step and the 3rd temperature controlling step.In the 1st temperature controlling step, make the temperature of end of the width of sheet glass be lower than temperature, and the temperature of middle section is become evenly by the middle section of end clamping.In the 2nd temperature controlling step, the temperature of the width of sheet glass is descended to the end from central part.In the 3rd temperature controlling step, near the temperature province strain point of glass, the end of the width of elimination sheet glass and the thermograde of central part.By this, the thickness of slab that can do one's utmost to make sheet glass evenly and can reduce warpage and strain (residual stress).Moreover the middle section of sheet glass is the zone that comprises the part of the object that makes the thickness of slab homogenizing, and the end of sheet glass is the zone that comprises the part of the object that cuts after the manufacturing.
In the 1st temperature controlling step, be lower than temperature by the temperature of the end of the width that makes sheet glass, and improve the viscosity of the end of sheet glass by the middle section of end clamping.By this, can suppress the contraction of the width of sheet glass.If sheet glass shrinks on width, the thickness of slab at the position of then shrinking increases, and the thickness deviation variation.Therefore, be lower than the temperature of middle section, can make the thickness of slab homogenizing by the temperature of the end of the width that makes sheet glass.In the 1st temperature controlling step,, and the viscosity of middle section is become evenly by the equalizing temperature of the middle section that makes sheet glass.By this, can make the thickness of slab homogenizing of sheet glass.
In the 2nd temperature controlling step, so that the mode formation temperature gradient that the temperature of the width of sheet glass descends to the end from central part.And, in the 3rd temperature controlling step, so that the mode that near the temperature province of the thermograde that forms in the 2nd temperature controlling step strain point of glass reduces is cooled off sheet glass.By this and since along with from the end of sheet glass towards central part, the volume shrinkage mass of sheet glass increases, and has the effect of tensile stress at the central part of sheet glass.Especially, in the central part of sheet glass, on the flow direction of sheet glass and width, there is the effect of tensile stress.At this, greatly better than the tensile stress on the width in the tensile stress of the flow direction of sheet glass.At this, owing to the Flatness that can utilize stretching gravitation simultaneously to keep sheet glass is simultaneously cooled off, so can reduce the warpage of sheet glass.
When sheet glass has thermograde in strain point of glass, then when being cooled to normal temperature, produce strain.Therefore, in the 3rd temperature controlling step, cool off, can reduce cooled strain by the mode that reduces thermograde with near the temperature province strain point of glass.Moreover the temperature from the central part of width direction that is preferably in the 3rd temperature controlling step refrigerative sheet glass deducts the temperature of end and the value that obtains gets in-20 ℃ to 20 ℃ the scope.
In the 2nd temperature controlling step, the thermograde that is more preferred from the width that makes sheet glass is along with the flow direction towards sheet glass reduces gradually.
In the 2nd temperature controlling step, be more preferred from so that the mode formation temperature gradient that the temperature of the width of sheet glass reduces to the end from central part gradually.
In the 2nd temperature controlling step, be more preferred from so that the mode formation temperature gradient that the temperature of the width of sheet glass reduces to the end from central part gradually, and this thermograde is along with the flow direction towards sheet glass reduces gradually.
In the 2nd temperature controlling step, be more preferred from so that the temperature of the width of sheet glass is reduced to the mode formation temperature gradient of convex gradually to the end from central part.
In the 2nd temperature controlling step, be more preferred from so that the temperature of the width of sheet glass is reduced to the mode formation temperature gradient of convex from central part to the end gradually, and this thermograde is along with the flow direction towards sheet glass reduces gradually.
Be preferably the 1st temperature controlling step and be when the temperature of the central part of sheet glass is the situation more than the glass softening point and carry out, the 2nd temperature controlling step and the 3rd temperature controlling step are that the temperature in the central part of sheet glass is carried out when being lower than the situation of glass softening point.By this, in the 1st temperature controlling step, control, and after the thickness of slab of sheet glass becomes evenly, carry out the 2nd temperature controlling step and the 3rd temperature controlling step so that the temperature of the middle section of sheet glass becomes uniform mode.Therefore, tensile stress is played a role to the central part that thickness of slab becomes uniform sheet glass in the flow direction and the width of sheet glass.By this, the Flatness one side that can simultaneously keep sheet glass is cooled off sheet glass.Therefore, can reduce the warpage of sheet glass.
In the 3rd temperature controlling step, being preferably the end of the width that makes the sheet glass in the cooling step and the temperature head of central part becomes minimum.If sheet glass has temperature head in strain point of glass, then after being cooled to normal temperature, produce strain.That is, near the temperature province strain point of glass, end and the temperature head of central part of the width of sheet glass are reduced, can reduce the strain of sheet glass.
The so-called thermograde of eliminating, be preferably in the width of sheet glass from the temperature of central part deduct the temperature of end and the value that obtains in-20 ℃ to 20 ℃ scope.
Strain point of glass top temperature controlling step is preferably and then is included in the temperature province that is lower than near the temperature province the strain point of glass, the 4th temperature controlling step that the temperature of the width of sheet glass is descended to central part from the end.By this, along with from the end of sheet glass towards central part, the amount of cooling water of sheet glass increases.Therefore, as stated in the central part of sheet glass, tensile stress plays a role to the flow direction and the width of sheet glass.Therefore, simultaneously cool off owing to can simultaneously keep the Flatness of sheet glass, so can reduce the warpage of sheet glass.
In the 4th temperature controlling step, be preferably near the temperature province of the temperature province being lower than strain point of glass, so that the mode formation temperature gradient that the temperature of sheet glass reduces to central part from the end of width direction gradually.
In the 4th temperature controlling step, be preferably near the temperature province of the temperature province being lower than strain point of glass, so that the temperature of sheet glass is reduced to the mode formation temperature gradient of convex gradually to central part from the end of width direction.
In the 4th temperature controlling step, the end and the thermograde between the central part that are preferably the width of sheet glass increase along the flow direction of sheet glass.
In the 4th temperature controlling step, end and the thermograde between the central part that is preferably the width that makes sheet glass increases along the flow direction of sheet glass gradually.
Sheet glass is preferably the strain value that has below the 1.0nm, is more preferred from the strain value in the scope with 0nm～0.95nm, and then is preferably the strain value in the scope with 0nm～0.90nm.
Sheet glass is preferably the warp value that has below the 0.15mm, is more preferred from the warp value in the scope with 0mm～0.10mm, and then is preferably the warp value in the scope with 0mm～0.05mm.
Sheet glass is preferably the thickness deviation that has below the 15 μ m, is more preferred from the thickness deviation in the scope with 0 μ m～14 μ m, and then is preferably the thickness deviation in the scope with 0 μ m～13 μ m.
The invention effect
The thickness of slab that the method for manufacture of sheet glass of the present invention can do one's utmost to make sheet glass evenly and can reduce the warpage and the strain (residual stress) of sheet glass.
Description of drawings
Fig. 1 is the schema of a part of method of manufacture of the sheet glass of present embodiment;
Fig. 2 is the main mode chart of representing fusing device contained in the manufacturing installation of sheet glass;
Fig. 3 is the diagrammatic elevational view of shaping appts;
Fig. 4 is the summary side elevation of shaping appts;
Fig. 5 is the control functional diagram of gear;
Fig. 6 is the table of the temperature of the sheet glass SG in each temperature distribution of expression (following);
Fig. 7 is the chart of the temperature distribution in the table of Fig. 6;
Fig. 8 is the speed of cooling in the expression temperature controlling step and the table of thermograde.
Embodiment
Below, one side is with reference to graphic, one make the sheet glass of sheet glass in the face of the manufacturing installation 100 of the sheet glass that uses present embodiment method of manufacture describe.
(1) summary of the method for manufacture of sheet glass
Fig. 1 is the schema of a part of method of manufacture of the sheet glass of present embodiment.
Below, use Fig. 1 that the method for manufacture of sheet glass is described.
As shown in Figure 1, sheet glass is to make via each step that comprises fusion step ST1, clarification steps ST2, homogenization step ST3, forming step ST4, cooling step ST5 and cutting step ST6.Below, these steps are described.
In fusion step ST1, heating glass raw material and make its fusion.Frit comprises compositions such as SiO2, Al2O3.The frit of fusion becomes melten glass fully.
In clarification steps ST2, melten glass is clarified.Particularly, release is contained in the gaseous constituent in the melten glass in melten glass, and the gaseous constituent that perhaps will be contained in the melten glass absorbs to melten glass.
In homogenization step ST3, melten glass is homogenized.Moreover in this step, the temperature of the melten glass after the clarification is accomplished in adjustment.
In forming step ST4, make melten glass be configured as flat sheet glass SG (SheetGlass) (with reference to Fig. 3 or Fig. 4) by glass tube down-drawing (particularly being overflow downdraw).
In cooling step ST5, the sheet glass SG of formed thereby among the cooling forming step ST4.In this cooling step ST5, SG is cooled near room temperature with sheet glass.
In cutting step ST6, the sheet glass SG that is cooled near room temperature is cut into length-specific respectively and processes cutting sheet glass SG1 (with reference to Fig. 3).
Moreover, thereafter, further the cutting sheet glass SG1 that cuts into length-specific is respectively cut, and carry out grinding, grinding, clean, inspection and process sheet glass, and be used for flat-panel monitor such as liquid-crystal display.
(2) summary of the manufacturing installation 100 of sheet glass
Fig. 2 is the mode chart that main expression is contained in the fusing device 200 in the manufacturing installation 100 of sheet glass.Fig. 3 is the diagrammatic elevational view that is contained in the shaping appts 300 in the manufacturing installation 100 of sheet glass.Fig. 4 is the summary side elevation of shaping appts 300.Below, the manufacturing installation 100 of sheet glass is described.
The manufacturing installation 100 of sheet glass mainly has fusing device 200 (with reference to Fig. 2), shaping appts 300 (with reference to Fig. 2～Fig. 4), and cutting unit 400 (with reference to Fig. 3).
(2-1) formation of fusing device 200
As shown in Figure 2, fusing device 200 has fusion groove 201, clarifying tank 202, steel basin the 203, the 1st pipe arrangement 204, and the 2nd pipe arrangement 205.
Fusion groove 201 is the grooves in order to the fusion frit.In fusion groove 201, fuse step ST1.
The 1st pipe arrangement 204 and the 2nd pipe arrangement 205 are the pipe arrangement of platinum family element or platinum family element alloy system.The 1st pipe arrangement 204 is for connecting the pipe arrangement of clarifying tank 202 and steel basin 203.The 2nd pipe arrangement 205 is for connecting the pipe arrangement of steel basin 203 and shaping appts 300.
(2-2) formation of shaping appts 300
Shaping appts 300 is in order to form the device of step ST4 and cooling step ST5.
Like Fig. 3 or shown in Figure 4, shaping appts 300 has molding 310, environment partition member 320, cooling roller 330, cooling unit 340, draw roll 350a～350e, well heater 360a～360e.
Below, these formations are described.
(2-2-1) molding 310
Molding 310 is in order to form the device of step ST4.
As shown in Figure 3, molding 310 is positioned at the upper section of shaping appts 300, and has by overflow downdraw and make in fusing device 200 melten glass that flows and come be configured as the function of flat sheet glass (sheet glass SG).Molding 310 cuts on vertical direction and the section shape that obtains has wedge-type shape, is to be made up of brick.
As shown in Figure 4, in molding 310, the upstream side of the path direction of the melten glass that comes in fusing device 200, flowing is formed with supplying opening 311.As shown in Figure 3, in molding 310, be formed with open groove 312 in the top along its length direction.Groove 312 is with the mode that shoals lentamente towards the downstream side along with the upstream side from the path direction of melten glass and form.
Flow in the groove 312 of molding 310 via supplying opening 311 to shaping appts 300 mobile and next melten glass from fusing device 200.
The mobile melten glass is in the overflow of the top of this groove 312 in the groove 312 of molding 310, and flows down along the two sides 313 of molding 310.And the melten glass that flows down along the two sides 313 of molding 310 becomes sheet glass SG in 314 interflow, bottom of molding 310.
(2-2-2) the environment partition member 320
Like Fig. 3 or shown in Figure 4, environment partition member 320 is near the tabular components that are disposed at the bottom 314 of molding 310.
(2-2-3) cooling roller 330
Cooling roller 330 is the belows that are disposed at environment partition member 320.Again, cooling roller 330 is the both sides with the thickness direction that is positioned at sheet glass SG, and disposes with the mode of the two end portions subtend of its width.Cooling roller 330 carries out air cooling by the air cooling pipe through inside.Therefore; When sheet glass SG passes through cooling roller 330; With the two side portions of its its thickness direction that contacts with the cooling roller 330 of air cooling and the two end portions of its width (below, this part is called the R of ear, the L (with reference to Fig. 4 or Fig. 7) of sheet glass SG) cooling.By this, the viscosity of the R of this ear, L is become more than the particular value (particularly being 109.0 pools).Because cooling roller 330 transmits and utilizes the motivating force of cooling roller CD-ROM drive motor 390 (with reference to Fig. 5), so also have the downward tensile effect with sheet glass SG.
Utilize cooling roller 330, SG is drawn into specific thicknesses with sheet glass.
(2-2-4) cooling unit 340
Width in sheet glass SG disposes a plurality of (being 3 here) cooling unit 340, and disposes a plurality of in its flow direction.Particularly, cooling unit 340 is to dispose 1 respectively with the mode with the surperficial subtend of the R of ear of sheet glass SG, L, and disposes 1 with the mode with the surperficial subtend of following middle section CA (with reference to Fig. 4 or Fig. 7).
(2-2-5) draw roll 350a～350e
In the below of cooling roller 330, with specific arranged spaced draw roll 350a～350e is arranged in the flow direction of sheet glass SG.Again, draw roll 350a～350e is with the both sides respectively at the thickness direction of sheet glass SG, and disposes with the mode of the two end portions subtend of the width of sheet glass SG.And two side portions and the two end portions of its width that draw roll 350a～350e one side and the viscosity of the R of ear, L in cooling roller 330 become the thickness direction of the sheet glass SG more than the particular value contacts, one side this with sheet glass SG to stretched.Moreover draw roll 350a～350e drives by transmission utilizes the motivating force of draw roll CD-ROM drive motor 391 (with reference to Fig. 5).The SFM of draw roll 350a～350e is greater than the SFM of cooling roller 330.Along with the downstream side of the flow direction that is disposed at sheet glass SG, the SFM of draw roll increases.That is, in a plurality of draw roll 350a～350e, the SFM of draw roll 350a is minimum, and the SFM of draw roll 350e is maximum.
(2-2-6) well heater
Flow direction in sheet glass SG disposes a plurality of (being 5 here) well heater, and disposes a plurality of (being 5 here) in the width of sheet glass SG.Well heater 360a～360e is by utilizing following gear 500 to control output, and as control utilize draw roll 350a～350e downwards near (particularly for heating up) temperature-control device of the envrionment temperature of the sheet glass SG of traction play a role.
The a plurality of well heaters that are disposed at the width of sheet glass SG are controlled the envrionment temperature of the L of ear, left part CL (with reference to Fig. 4 or Fig. 7), central part C (with reference to Fig. 4 or Fig. 7), right part CR (with reference to Fig. 4 or Fig. 7), the R of ear respectively in regular turn from the upstream side of above-mentioned path direction.
Here; The envrionment temperature of utilizing the sheet glass SG of the downward traction of draw roll 350a～350e is to utilize well heater 360a～360e to carry out temperature control (particularly; Be the temperature of controlling sheet glass SG by the envrionment temperature of control sheet glass SG), carry out the cooling that sheet glass SG moves to Hookean region via the viscoelasticity zone from the stickiness zone by this.
Moreover; In well heater 360a～360e separately near; As a plurality of thermopairs (being called thermopair unit 380 (with reference to Fig. 5) here) of the test set of the envrionment temperature of each the regional envrionment temperature that detects sheet glass SG respectively with well heater 360a～360e corresponding mode configuration.That is, dispose a plurality of thermopairs in the flow direction of sheet glass SG, and dispose a plurality of thermopairs in its width.
As stated, in the zone of bottom below 314 of molding 310, utilize the step of cooling roller 330, cooling unit 340, well heater 360a～360e cooling sheet glass SG to be cooling step ST5.
(2-3) cutting unit 400
In cutting unit 400, carry out cutting step ST6.Cutting unit 400 is from the device that cuts with the vertical direction of its length face to the sheet glass SG that in shaping appts 300, flows down.By this, flat sheet glass SG becomes the plural piece cutting sheet glass SG1 with length-specific.Cutting unit 400 is to drive by cutting unit CD-ROM drive motor 392 (with reference to Fig. 5).
(3) gear 500
Fig. 5 is the control functional diagram of gear 500.
Particularly; As shown in Figure 5; Gear 500 receives signal that various sensors in the manufacturing installation 100 that is contained in sheet glass (for example thermopair unit 380 etc.) or switch (for example main power switch 381 etc.) wait, reach the input signal that is derived from the operator via input unit (not shown) etc., and cooling unit 340, well heater 360a～360e, cooling roller CD-ROM drive motor 390, draw roll CD-ROM drive motor 391 and cutting unit CD-ROM drive motor 392 etc. are controlled.
(4) control of the temperature among the cooling step ST5
Fig. 6 is the table of the temperature of the sheet glass SG in each temperature distribution of expression (following).Fig. 7 is the chart of the temperature distribution in the table of Fig. 6.Fig. 8 is speed of cooling and the table of thermograde among expression temperature controlling step ST11～ST14.
In cooling step ST5, implement sheet glass SG is carried out temperature controlled temperature controlling step ST10 (with reference to Fig. 8).Particularly, in temperature controlling step ST10, gear 500 controlled chilling rollers 330 are controlled the temperature of sheet glass SG by this.In temperature controlling step ST10, controlled chilling unit 340, and well heater 360a～360e and carry out the control of the envrionment temperature of sheet glass SG control the temperature of sheet glass SG by this.Moreover the temperature of Fig. 6, the sheet glass SG shown in 7 is based on the envrionment temperature of the sheet glass SG that utilizes cooling unit 340 and well heater 360a～360e control, and the value of calculating by simulation.
In cooling step ST5, by carrying out temperature controlling step ST10, the temperature that makes sheet glass SG and makes the temperature of sheet glass SG on its width, have specific temperature distribution in specific height location gets into specific TR.That is, the temperature of sheet glass SG is on its flow direction and width, to control.
Below, the temperature distribution that temperature had of sheet glass SG is called optimal temperature distribute (shown in the solid line of Fig. 7).Moreover like Fig. 6 and shown in Figure 7, in the bottom 314 of molding 310, the temperature of sheet glass SG is even (comprising positive and negative 20 ℃ scope) on its width, is about 1150 ℃.
As shown in Figure 8, temperature controlling step ST10 comprises strain point of glass top temperature controlling step ST10a and strain point below temperature controlling step ST14.Below, each temperature controlling step is described.
(4-1) strain point of glass top temperature controlling step ST10a
Strain point of glass top temperature controlling step ST10a is that the temperature to sheet glass SG is lower than the temperature controlled step of carrying out sheet glass SG till near the temperature province the strain point of glass from the bottom 314 of molding 310, and comprises the 1st temperature controlling step ST11, the 2nd temperature controlling step ST12 and the 3rd temperature controlling step ST13.Moreover so-called strain point of glass is meant the strain point of common glass, is the temperature (for example 661 ℃) of the viscosity that is equivalent to 1014.5 pools.Near the so-called strain point of glass temperature province, be meant from strain point of glass and glass slow cooling point mutually the temperature ((strain point of glass+glass slow cooling point)/2) that obtains divided by 2 of adduction extremely deduct the scope of 50 ℃ temperature (strain point of glass-50 ℃) from strain point of glass.So-called glass slow cooling point is meant the slow cooling point of common glass, is the temperature (for example 715 ℃) of the viscosity that is equivalent to 1013 pools.
(4-1-1) the 1st temperature controlling step ST11
The 1st temperature controlling step ST11 is that the temperature of in the position that on the width of sheet glass SG, becomes top temperature (middle section CA) is carried out when being the situation more than the glass softening point.So-called glass softening point is meant the softening temperature of common glass, is the temperature (for example 950 ℃) of the viscosity that is equivalent to 107.6 pools.
In the 1st temperature controlling step ST11,, temperature distribution controls so that becoming the mode of the 1st temperature distribution TP11.
(4-1-1-1) the 1st temperature distribution TP11
As shown in Figure 7, so-called the 1st temperature distribution TP11 is that the R of ear of sheet glass SG, the temperature of L are lower than the temperature of middle section CA, and becomes homogeneous temp by the temperature of the width of the middle section CA of the R of ear, L clamping and distribute.It is here, so-called that " temperature of the width of middle section CA becomes evenly, and the temperature head that is meant the width of middle section CA gets in-20 ℃ to 20 ℃ the scope.So-called middle section CA is meant the zone that comprises right part CR, central part C and left part CL.Body, the middle section CA of sheet glass SG is the zone that comprises the part of the object that makes the thickness of slab homogenizing.The R of ear of the end of the width of sheet glass SG, L comprise to make after the zone of the part of the object of cutting.
(4-1-1-2) in order to form the control of the 1st temperature distribution TP11
In the 1st temperature controlling step ST11,, and make temperature distribution become the 1st temperature distribution TP11 by controlled chilling roller 330 and cooling unit 340.Particularly; Utilize ear R, the L cooling of cooling roller 330 with sheet glass SG; Again; Utilize the envrionment temperature of cooling unit 340 control sheet glass SG, make the R of ear of sheet glass SG, the temperature of L compare low specified temp (particularly, low 200 ℃～250 ℃) with the temperature of middle section CA by this.And the envrionment temperature by utilizing cooling unit 340 control sheet glass SG makes the temperature of the R of ear, L compare low specified temp with the temperature of middle section CA, and keeps the temperature change homogeneous temp distribution of the width of middle section CA.By this, can do one's utmost to make the thickness of slab homogenizing of the middle section CA of sheet glass SG.As stated, dispose 3 cooling units 340 here, in width.Therefore, can carry out temperature control independently to the R of ear of sheet glass SG, L temperature and the temperature of middle section CA separately.
Like Fig. 6 and shown in Figure 7, the R of ear of the sheet glass SG among the 1st temperature distribution TP11, the temperature of L are 880 ℃, and the temperature of middle section CA is 1070 ℃.
(4-1-2) the 2nd temperature controlling step ST12
The 2nd temperature controlling step ST12 is after the temperature of the middle section CA of sheet glass SG is lower than glass softening point, and the temperature of sheet glass SG is carried out during near the temperature province the entering strain point of glass through near the temperature province the glass slow cooling point.Near the so-called glass slow cooling point temperature province is meant that oneself adds glass slow cooling point 100 ℃ temperature (glass slow cooling point+100 ℃) is to being higher than strain point of glass and the glass slow cooling point scope of the temperature ((strain point of glass+glass slow cooling point)/2) that obtains divided by 2 of adduction mutually.
In the 2nd temperature controlling step ST12,, temperature distribution controls so that becoming the mode of the 2nd temperature distribution TP20.
(4-1-2-1) the 2nd temperature distribution TP20
So-called the 2nd temperature distribution TP20 is meant the temperature distribution that the temperature of the width of sheet glass SG descends to the R of ear, L from central part C, and has the shape of the curve of the epirelief depicted.That is, in the 2nd temperature controlling step ST12, on width, the temperature of the central part C of sheet glass SG is the highest, and the R of ear of sheet glass SG, the temperature of L are minimum.Moreover in the 2nd temperature distribution TP20, temperature descends to the R of ear, L from central part C on width continuously.
In the 2nd temperature distribution TP20, comprise a plurality of temperature distribution (particularly, in present embodiment, comprising 2a temperature distribution TP21 and 2b temperature distribution TP22).2a temperature distribution TP21 and 2b temperature distribution TP22 are positioned at from the upstream side of the flow direction of the sheet glass SG position of side downstream in regular turn.
(promptly the temperature along with the middle section CA of sheet glass SG is lower than glass softening point towards the downstream side of the flow direction of TP20 sheet glass SG along with the 2nd temperature distribution; And the temperature of sheet glass SG is near near the temperature province the strain point of glass); On the width of sheet glass SG; The absolute value of the temperature head of the temperature of the temperature of the R of ear, L and central part C (being called the temperature head absolute value here) diminishes.Therefore, the temperature head absolute value of 2a temperature distribution TP21 is less than the temperature head absolute value of 2b temperature distribution TP22.
Here, along with towards the downstream side of the flow direction of sheet glass SG, the temperature head absolute value diminishes; Change speech; Along with towards the downstream side of the flow direction of sheet glass SG, among the 2nd temperature distribution TP20, the thermograde of the temperature of the R of ear of sheet glass SG, the temperature of L and central part C diminishes.The thermograde of the temperature of the R of ear of so-called sheet glass SG, the temperature of L and central part C; Shown in 2 chain lines of Fig. 7; Be meant the temperature of using from central part C deduct the R of ear temperature value divided by with the width W of sheet glass SG divided by 2 value and winner's absolute value (here; Be called the 1st gradient absolute value); Or use temperature from central part C deduct the L of ear temperature value divided by with the width W of sheet glass SG divided by 2 value and winner's absolute value (being called the 2nd gradient absolute value here).Moreover in following explanation, the thermograde of the temperature of the R of ear of so-called sheet glass SG, the temperature of L and central part C is meant the 1st gradient absolute value and the 2nd gradient average absolute.
In the 2nd temperature controlling step ST12, increase according to the order of the thermograde TG22 of the thermograde TG21 of 2a temperature distribution TP21,2b temperature distribution TP22.
(4-1-2-2) in order to form the control of the 2nd temperature distribution TP20
In the 2nd temperature controlling step ST12, by control a part of well heater (being well heater 360a and 360b) here, temperature distribution becomes the 2nd temperature distribution TP20.
Particularly,, form 2a temperature distribution TP21,, form 2b temperature distribution TP22 by control heater 360b by control heater 360a.Moreover, though not shown, in the 2nd temperature distribution TP20 of present embodiment and then comprise another 2c temperature distribution.This 2c temperature distribution is the temperature distribution that after the temperature of the middle section CA of sheet glass SG is lower than glass softening point, forms.The 2c temperature distribution is to utilize cooling unit 340 to carry out temperature to control and form.
Moreover, in present embodiment, make the curve of approximation of 5 the temperature of the R of ear, L, right part CR, left part CL, central part C become the 2nd temperature distribution TP20.
Like Fig. 6 and shown in Figure 7, the temperature of the L of ear of the sheet glass SG among the 2a temperature distribution TP21, left part CL, central part C, right part CR, the R of ear is 785 ℃, 798 ℃, 819 ℃, 792 ℃, 776 ℃ in regular turn.Again, the temperature of the L of ear of the sheet glass SG among the 2b temperature distribution TP22, left part CL, central part C, right part CR, the R of ear is 763 ℃, 770 ℃, 784 ℃, 765 ℃, 757 ℃ in regular turn.
In the 2nd temperature controlling step ST12, be with on the width of sheet glass SG, make the speed of cooling of central part C become the fastest mode control heater.
That is,, make the speed of cooling of the temperature of central part C be higher than the mode control heater of speed of cooling of temperature of speed of cooling or right part CR, the left part CL of the temperature of the R of ear, L with on the width of sheet glass SG.By this, can form 2a temperature distribution TP21 and 2b temperature distribution TP22.
Moreover, for concrete speed of cooling, explain with the position of the temperature controlling step ST13 strain point near.Again, thermograde TG21, the TG22 among each temperature distribution TP21, the TP22 is respectively 7.4 * 10-3 ℃/mm, 4.7 * 10-3 ℃/mm.
(4-1-3) the 3rd temperature controlling step ST13
The 3rd temperature controlling step ST13 be near the temperature province the temperature of sheet glass SG gets into strain point of glass during carry out.
In the 3rd temperature controlling step ST13,, temperature distribution controls so that becoming the mode of the 3rd temperature distribution TP31.
(4-1-3-1) the 3rd temperature distribution TP31
So-called the 3rd temperature distribution TP31 is that the temperature of instigating the width of sheet glass SG (temperature from the R of ear of width direction, L to central part C) becomes homogeneous temp and distributes.Change speech, so-called the 3rd temperature distribution TP31 is meant on the width of sheet glass SG, eliminates the temperature distribution of thermograde of the R of ear, L and the central part C of temperature.
Here, so-called " becoming evenly ", " elimination thermograde " are meant on the width of sheet glass SG, deduct the temperature of the R of ear, L and the value that obtains gets in-20 ℃ to 20 ℃ the scope from the temperature of central part C.
(4-1-3-2) in order to form the control of the 3rd temperature distribution TP31
In the 3rd temperature controlling step ST13,, make temperature distribution become the 3rd temperature distribution TP31 by control a part of well heater (, being 360c here).Here, so that the temperature head absolute value among the cooling step ST5 becomes minimum mode control heater 360c.
Moreover like Fig. 6 and shown in Figure 7, the temperature of the L of ear of the sheet glass SG among the 3rd temperature distribution TP31, left part CL, central part C, right part CR, the R of ear is 647 ℃, 647 ℃, 670 ℃, 654 ℃, 653 ℃ in regular turn.
In the 3rd temperature controlling step ST13, with the 2nd temperature controlling step ST12 likewise, be with in the width of sheet glass SG, make the speed of cooling of the temperature of central part C become the fastest mode control heater 360c.That is, so that the speed of cooling of the temperature of central part C is higher than the mode control heater 360c of speed of cooling of temperature of speed of cooling or right part CR, left part CL of temperature of the R of ear, the L of sheet glass SG.
If the concrete speed of cooling of explanation is then as shown in Figure 8, for example the average cooling rate of the temperature of the central part C of the sheet glass SG in the temperature province till near (glass slow cooling point+150 ℃) to the temperature province that is lower than the strain point of glass is 2.7 ℃/second.Again, the average cooling rate of the temperature of the right part CR of the sheet glass SG in the temperature province till near (glass slow cooling point+150 ℃) to the temperature province that is lower than the strain point of glass, left part CL is 2.5 ℃/second.Again, the average cooling rate of the temperature of the R of ear of the sheet glass SG in the temperature province till near (glass slow cooling point+150 ℃) to the temperature province that is lower than the strain point of glass, L is 2.1 ℃/second.
(4-2) strain point below temperature controlling step ST14
Strain point below temperature controlling step ST14 is that the temperature in sheet glass SG is in near the temperature province that is lower than the strain point of glass and carries out when deducting between 200 ℃ the temperature from strain point of glass.
In the temperature controlling step ST14 of strain point below, be to control with the mode that temperature distribution becomes the 4th temperature distribution TP40.
(4-2-1) the 4th temperature distribution TP40
So-called the 4th temperature distribution TP40 is meant the temperature distribution that the temperature of the width of sheet glass SG descends to central part C from the R of ear, L, and has the shape of describing protruding curve.That is, in the temperature controlling step ST14 of strain point below, on width, the R of ear of sheet glass SG, the temperature of L are the highest, and the temperature of the central part C of sheet glass SG is minimum.
In the 4th temperature distribution TP40, comprise a plurality of temperature distribution (particularly, in present embodiment, comprising 4a temperature distribution TP41 and 4b temperature distribution TP42).4a temperature distribution TP41 and 4b temperature distribution TP42 are positioned at the zone from upstream side to the downstream side of the flow direction of sheet glass SG in regular turn.
Along with towards the downstream side of the flow direction of sheet glass SG (promptly along with the temperature of sheet glass SG from being lower than near the strain point of glass temperature province near deducting 200 ℃ temperature province from strain point of glass), the temperature head absolute value of the 4th temperature distribution TP40 increases.Therefore, in the temperature controlling step ST14 of strain point below, the temperature head absolute value among the 4a temperature distribution TP41 is less than the temperature head absolute value among the 4b temperature distribution TP42.
Here, along with towards the downstream side of the flow direction of sheet glass SG, the temperature head absolute value increases; Change speech; Along with towards the downstream side of the flow direction of sheet glass SG, among the 4th temperature distribution TP40, the thermograde of the temperature of the R of ear of sheet glass SG, the temperature of L and central part C increases.
Therefore, in the temperature controlling step ST14 of strain point below, the size of thermograde is the thermograde TG42 of 4b temperature distribution TP42, the thermograde TG41 of 4a temperature distribution TP41 from big to small in regular turn.
(4-2-2) in order to become the control of the 4th temperature distribution TP40
In the temperature controlling step ST14 of strain point below,, make temperature distribution become the 4th temperature distribution TP40 by control a part of well heater (360d and 360e).
Particularly, to become the mode control heater 360d of 4a temperature distribution TP41, to become the mode control heater 360e of 4b temperature distribution TP42.
Moreover, in present embodiment, make the curve of approximation of 5 the temperature of the R of ear, L, right part CR, left part CL, central part C become the 4th temperature distribution TP40.
Like Fig. 6 and shown in Figure 7, the temperature of the L of ear of the sheet glass SG among the 4a temperature distribution TP41, left part CL, central part C, right part CR, the R of ear is 585 ℃, 565 ℃, 562 ℃, 570 ℃, 582 ℃ in regular turn.Again, the temperature of the L of ear of the sheet glass SG among the 4b temperature distribution TP42, left part CL, central part C, right part CR, the R of ear is 506 ℃, 472 ℃, 463 ℃, 468 ℃, 488 ℃ in regular turn.
As shown in Figure 8, in the temperature controlling step ST14 of strain point below,, make the speed of cooling of the temperature of central part C become the fastest mode control heater with on the width of sheet glass SG.That is, so that the speed of cooling of the temperature of central part C is higher than the mode control heater of speed of cooling of temperature of speed of cooling or right part CR, left part CL of temperature of the R of ear, the L of sheet glass SG.
Here, the average cooling rate of the temperature of the central part C of the sheet glass SG among the temperature controlling step ST14 of strain point below is 3.0 ℃/second.The average cooling rate of the right part CR of the sheet glass SG among the temperature controlling step ST14 of strain point below, the temperature of left part CL is 2.7 ℃/second.The average cooling rate of the R of ear of the sheet glass SG among the temperature controlling step ST14 of strain point below, the temperature of L is 2.0 ℃/second.Thermograde TG41, TG42 among each temperature distribution TP41, the TP42 is respectively 4.1 * 10-3 ℃/mm, 6.7 * 10-3 ℃/mm.
Moreover; In the 2nd temperature controlling step ST12, the 3rd temperature controlling step ST13 and strain point below temperature controlling step ST14; By controlling the output of each well heater 360a～360e based on utilizing thermopair unit 380 detected envrionment temperatures, and form the temperature distribution in the step separately.
(5) about the warpage of sheet glass
Use the method for manufacture of aforesaid sheet glass to make sheet glass, and measure the warpage of this sheet glass.At this moment, warp value is below the 0.15mm.
If the mensuration to the warpage of sheet glass describes, then at first downcut 8 platelets from the effective area of sheet glass.Then, platelet is placed on the glass platen.And (in present embodiment, being 4 angles, central part 2 places on long limit and central part 2 places of minor face) uses clearance gauge to measure the gap of each platelet and glass platen in a plurality of positions.
(6) about the strain of sheet glass
The degree of birefringence tester ABR-10A that uses Uniopt to make, the size of the degree of birefringence of mensuration sheet glass.At this moment, the greatest birefringence amount is 0.6nm.
(7) about the thickness deviation of sheet glass
In the effective area of sheet glass, the displacement gauge that uses KEYENCE limited-liability company to make, on width with the measuring space thickness deviation of 5mm.At this moment, the thickness deviation of sheet glass is 10 μ m～15 μ m.
(8) characteristic
(8-1)
In present embodiment, in cooling step ST5, carry out strain point of glass top temperature controlling step ST10a.Strain point of glass top temperature controlling step ST10a comprises the 1st temperature controlling step ST11, the 2nd temperature controlling step ST12 and the 3rd temperature controlling step ST13.
Here, usually, be tending towards utilizing the surface tension of self with the isolating sheet glass of molding and shrink.Therefore, there is the uneven possibility of thickness of slab that sheet glass can take place.
Therefore; In present embodiment; Temperature in the central part C of sheet glass SG is in the temperature province more than the glass softening point; In the 1st temperature controlling step ST11, one side by be disposed at molding 310 under cooling roller 330 with sheet glass SG to stretched, one side is with the R of ear, the L chilling of sheet glass SG.By this, the R of ear of sheet glass SG, the viscosity of L (particularly, viscosity is become more than 109.0 pools) can be increased as soon as possible, and the contraction of capillary sheet glass SG can be suppressed to utilize.Here, if sheet glass SG shrinks on width, the thickness of slab at the position of then shrinking increases, and the thickness deviation variation.Therefore, be lower than the temperature of middle section CA, can make the thickness of sheet glass SG even sheet glass on width, become even by the temperature of the R of ear that in the 1st temperature controlling step ST11, makes sheet glass SG, L.
In the 1st temperature controlling step ST11, by the equalizing temperature of the middle section CA that makes sheet glass SG, the viscosity of middle section CA becomes evenly.By this, can make the thickness of slab homogenizing of sheet glass SG.
In present embodiment, the SFM of cooling roller 330 is less than the SFM of draw roll 350a～350e.
By this, owing to the R of ear of sheet glass SG, the time that L contacts with cooling roller 330 increase, so utilize the R of ear to sheet glass SG of cooling roller 330, the cooling performance of L further to increase.Therefore, can make the thickness of sheet glass SG even sheet glass more even on width.
It is generally acknowledged, if having the temperature head of the width of sheet glass near the temperature province strain point of glass, then be easy to generate strain (residual stress) usually.
Therefore, in present embodiment, by carrying out the 3rd temperature controlling step ST13, near the temperature province strain point of glass, the mode of thermograde of the R of ear, L and central part C of eliminating the width of the sheet glass SG temperature that controls environment.That is, in the 3rd temperature controlling step ST13, make the temperature head absolute value among the cooling step ST5 become minimum.If sheet glass SG glass has temperature head in strain point, then after being cooled to normal temperature, produce strain.That is, in the 3rd temperature controlling step ST13, near the temperature province strain point of glass reduces the thermograde of the R of ear, L and the central part C of the width of sheet glass SG, can reduce the strain of sheet glass SG by this.Thermograde is preferably that temperature from the central part C of sheet glass SG deducts the temperature of the R of ear, L and the value that obtains gets in-20 ℃ to 20 ℃ the scope.
By this, can reduce the strain (residual stress) of sheet glass SG even sheet glass.
In present embodiment, the 2nd temperature distribution TP20 that reduces to the R of ear, L from central part C from the temperature in the width of sheet glass SG becomes uniform the 3rd temperature distribution TP31 to the temperature of the width of sheet glass SG and changes.Promptly; In present embodiment; The temperature of the central part C of sheet glass SG is in the temperature province that is lower than glass softening point; In the 2nd temperature controlling step ST12 and the 3rd temperature controlling step ST13, on the width of sheet glass SG, make the speed of cooling of the temperature of central part C be higher than the speed of cooling of the temperature of the R of ear, L.
By this, in the 2nd temperature controlling step ST12 and the 3rd temperature controlling step ST13, therefore the volume shrinkage mass of sheet glass SG exists the effect of tensile stress along with the R of ear, the L from sheet glass SG increases towards central part C at the central part C of sheet glass SG.Especially, in the central part C of sheet glass SG, on the flow direction of sheet glass SG and width, there is the effect of tensile stress.At this, greatly better than the tensile stress on the width in the tensile stress of the flow direction of sheet glass glass SG.Therefore, can utilize tensile stress simultaneously to keep the Flatness of sheet glass SG, one side is cooled off, so more can further reduce the warpage of sheet glass SG even sheet glass.
Moreover; In present embodiment; Because by of the temperature cooling of the 1st temperature controlling step with the R of ST11 ear, L; And the temperature head of the R of ear, L and middle section CA is made as specified temp, so in the 2nd temperature controlling step ST12 or the 3rd temperature controlling step ST13, make the speed of cooling of the temperature of central part C be higher than the speed of cooling of the temperature of the R of ear, L.
(8-2)
In present embodiment, promptly to be convenient among the temperature controlling step ST14 of strain point below, tensile stress also plays a role to the central part C of sheet glass SG all the time.In the 1st temperature controlling step ST11, also utilize cooling roller 330 that the viscosity of the R of this ear, L is become more than the particular value, tensile stress is played a role to the central part C of sheet glass SG.
Therefore; In the cooling step ST5 of present embodiment; Not only utilize cooling roller 330 or draw roll 350a～350e that the tensile stress of width and flow direction is played a role to sheet glass SG; Also, the tensile stress of width and flow direction is played a role to sheet glass SG (especially to central part C) by carrying out temperature control.Therefore, can reduce the warpage of sheet glass SG even sheet glass.
(8-3)
In present embodiment, near the temperature province of the temperature province being lower than strain point of glass, the temperature of width that makes sheet glass SG from the R of ear, L to strain point below temperature controlling step ST14 that central part C descends.By this, the volume shrinkage mass of sheet glass SG is along with the R of ear, L from sheet glass SG increase towards central part C.Therefore, tensile stress central part C to sheet glass SG on the flow direction of sheet glass SG and width plays a role.Therefore, owing to can simultaneously utilize tensile stress to keep the Flatness of sheet glass SG, one side is cooled off, so can reduce the warpage of sheet glass SG.
(9) variation
More than, based on graphic present embodiment is described, but concrete formation is not limited to the foregoing description, can in the scope of the purport that does not break away from invention, change.
(9-1) variation 1A
In the foregoing description, with the mode of respectively envrionment temperature of the R of ear, L and the middle section CA of sheet glass SG being controlled, 3 cooling units 340 of configuration on the width of sheet glass SG, but be not limited thereto, also can be more than 3.
In the foregoing description, 5 well heaters of configuration on the width of sheet glass SG, but be not limited thereto in the quantity of the well heater of the width of sheet glass SG.
For example the quantity in the well heater of the width of sheet glass SG also can be more than 5.Moreover, in this case, be preferably corresponding to well heater, increase thermopair.
By this, can become the mode of the shape of better temperature distribution, control temperature or the envrionment temperature of sheet glass SG subtly.Therefore, can further help to reduce the warpage or the strain of sheet glass SG even sheet glass.
(9-2) variation 1B
In the foregoing description, 5 well heaters of configuration on the flow direction of sheet glass SG, but be not limited thereto in the quantity of the well heater of the flow direction of sheet glass SG.
For example the quantity in the well heater of the flow direction of sheet glass SG also can be more than 5.
By this, can control the temperature or the envrionment temperature of the flow direction of sheet glass SG more subtly.Therefore, can further help to reduce the warpage or the strain of sheet glass SG even sheet glass.
(9-3) variation 1C
Shaping appts 300 also can have be disposed at a plurality of draw roll 350a～350e separately between a plurality of heat insulating components.A plurality of heat insulating components are the both sides that are disposed at the thickness direction of sheet glass SG.
By heat insulating component is set, the control of the become temperature or the envrionment temperature of carrying out sheet glass SG more easily.That is, can suppress to go up, produce strain on the sheet glass even in sheet glass SG.
(9-4) variation 1D
In above-mentioned the 3rd temperature controlling step ST13, explained that the temperature of the width of sheet glass SG becomes uniform mode temperature control all the time with during near the temperature province the temperature entering strain point of glass of sheet glass SG.
But, be not limited thereto, during near the temperature of sheet glass SG gets into strain point of glass temperature province, at least 1 change of the temperature of the width of sheet glass SG evenly gets final product.That is, becoming the 3rd temperature distribution TP31 at least for 1 time gets final product.
Therefore; For example along the flow direction of sheet glass SG, near the height location of the temperature province the temperature like sheet glass SG gets into strain point of glass is when being provided with the situation more than the well heater of the foregoing description; In the 3rd temperature controlling step ST13; As long as carry out temperature control,, can also make to become uniform mode in the temperature of its width and carry out temperature control then for other temperature distribution with the mode that becomes the 3rd temperature distribution TP31 at least 1 time.In this case, the temperature distribution that is positioned at the 3rd temperature distribution TP31 top becomes the 2nd temperature distribution TP20, and the temperature distribution that is positioned at below the 3rd temperature distribution TP31 becomes the 4th temperature distribution TP40.
In this case, also can near the temperature province strain point in, make temperature head absolute value (or said temperature gradient) become minimum.Therefore, can reduce the strain of sheet glass SG even sheet glass.
(9-5) variation 1E
In the foregoing description, explained that a plurality of well heaters that dispose on the width that is used in sheet glass SG carry out the temperature control of the width of sheet glass SG, but be not limited thereto.For example also can and with water cooler etc.
(9-6) variation 1F
In the foregoing description, with in the 2nd temperature controlling step ST12, the mode formation temperature gradient that descends to the central part end from the temperature of the width of sheet glass SG.But, in the 2nd temperature controlling step ST12, being preferably along with flow direction towards sheet glass SG, the thermograde of the width of sheet glass SG reduces gradually.
In the 2nd temperature controlling step ST12, be more preferred from the mode formation temperature gradient that the temperature from the width of sheet glass SG reduces to the central part end gradually.In this case, be more preferred from along with the flow direction towards sheet glass SG, thermograde reduces gradually.
In the 2nd temperature controlling step ST12, the temperature that is more preferred from the width that makes sheet glass SG is reduced to the mode formation temperature gradient of convex gradually to the end from central part.In this case, be more preferred from along with the flow direction towards sheet glass SG, thermograde reduces gradually.
(9-7) variation 1G
In the temperature controlling step ST14 of the strain point of the foregoing description below, in the temperature province with near the temperature province being lower than strain point of glass, the mode formation temperature gradient that the temperature of the width of sheet glass SG is descended to central part C from the R of ear, L.But, in the temperature controlling step ST14 of strain point below, be preferably in the temperature province with near the temperature province being lower than strain point of glass the mode formation temperature gradient that the temperature of sheet glass SG is reduced to central part C from the R of ear, L gradually.
In the temperature controlling step ST14 of strain point below, be more preferred from the temperature province with near the temperature province being lower than strain point of glass, make the temperature of sheet glass SG be reduced to the mode formation temperature gradient of convex gradually to central part C from the R of ear, L.
In the temperature controlling step ST14 of strain point below, the thermograde that is more preferred between the R of ear, L and the central part C of sheet glass SG increases or increase gradually to the flow direction of sheet glass SG.
Utilizability on the industry
The present invention can make in various use glass tube down-drawings in the method for manufacture of sheet glass of sheet glass and carry out various application.
Nomenclature
The manufacturing installation of 100 sheet glass
310 moldinies
The bottom of 313 moldinies
330 cooling rollers (roller)
350a ~ 350e draw roll (roller)
The central part of C sheet glass
R, the ear of L sheet glass (end of width)
SG sheet glass
The ST4 forming step
The ST5 cooling step
ST10a strain point of glass top temperature controlling step
ST11 the 1st temperature controlling step
ST12 the 2nd temperature controlling step
ST13 the 3rd temperature controlling step
The prior art document
Patent documentation
Patent documentation 1: Japanese Patent Laid is opened the 2004-115357 communique
Claims (6)
1. the method for manufacture of a sheet glass is the method for manufacture by the sheet glass of glass tube down-drawing, and comprises the steps:
Forming step, it flows down by the two sides that make melten glass along molding, and in the interflow, bottom of above-mentioned molding, and form sheet glass, and
Cooling step, its simultaneously utilize roller with above-mentioned sheet glass to stretched, the one side cool off, it is characterized in that:
In above-mentioned cooling step; Carry out strain point of glass top temperature controlling step; It is in the temperature province till near the temperature province that is lower than the strain point of glass of the bottom of above-mentioned molding; The step that the temperature of the width of above-mentioned sheet glass is controlled, and comprise the steps:
The 1st temperature controlling step, it makes the end of the width of above-mentioned sheet glass be lower than by the temperature of the middle section of above-mentioned end clamping and the temperature of above-mentioned middle section is become evenly; The 2nd temperature controlling step, it makes the temperature of the width of above-mentioned sheet glass descend to the end from central part; And the 3rd temperature controlling step, near its temperature province strain point of glass, eliminate end and the thermograde of central part of the width of above-mentioned sheet glass.
2. the method for manufacture of sheet glass according to claim 1, wherein above-mentioned the 1st temperature controlling step is when the temperature of the central part of above-mentioned sheet glass is the situation more than the glass softening point, to carry out, and
Above-mentioned the 2nd temperature controlling step and above-mentioned the 3rd temperature controlling step are that the temperature in the central part of above-mentioned sheet glass is carried out when being lower than the situation of above-mentioned glass softening point.
3. the method for manufacture of sheet glass according to claim 1 and 2 wherein in above-mentioned the 3rd temperature controlling step, makes end and the temperature head of central part of the width of the above-mentioned sheet glass in the above-mentioned cooling step become minimum.
4. according to the method for manufacture of any described sheet glass in the claim 1 to 3; The wherein so-called said temperature gradient of eliminating, be on the width of above-mentioned sheet glass, make temperature from central part deduct the temperature of end and the value that obtains in-20 ℃ to 20 ℃ scope.
5. according to the method for manufacture of any described sheet glass in the claim 1 to 4; Wherein above-mentioned strain point of glass top temperature controlling step and then be included in temperature and be lower than near the temperature province of the temperature province the above-mentioned strain point of glass, the 4th temperature controlling step that the temperature of the width of above-mentioned sheet glass is descended to central part from the end.
6. the method for manufacture of sheet glass according to claim 5 wherein in above-mentioned the 4th temperature controlling step, makes the thermograde of end and central part of the width of above-mentioned sheet glass increase along the flow direction of above-mentioned sheet glass.
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| CN201310098649.7A CN103183462B (en) | 2011-03-31 | 2012-03-30 | The manufacture method of sheet glass |
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| JP2011081260 | 2011-03-31 | ||
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| JP2011081262 | 2011-03-31 | ||
| PCT/JP2012/058716 WO2012133843A1 (en) | 2011-03-31 | 2012-03-30 | Glass plate production method |
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| CN102822104B (en) | 2015-08-26 |
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