WO2012133463A1 - ガラスシート製造装置、ガラスシート製造方法および成形体 - Google Patents
ガラスシート製造装置、ガラスシート製造方法および成形体 Download PDFInfo
- Publication number
- WO2012133463A1 WO2012133463A1 PCT/JP2012/058017 JP2012058017W WO2012133463A1 WO 2012133463 A1 WO2012133463 A1 WO 2012133463A1 JP 2012058017 W JP2012058017 W JP 2012058017W WO 2012133463 A1 WO2012133463 A1 WO 2012133463A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- molded body
- arc
- glass sheet
- arc surface
- inclined surfaces
- Prior art date
Links
Images
Classifications
-
- 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
- C03B17/064—Forming glass sheets by the overflow downdraw fusion process; Isopipes therefor
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B18/00—Shaping glass in contact with the surface of a liquid
- C03B18/02—Forming sheets
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B18/00—Shaping glass in contact with the surface of a liquid
- C03B18/02—Forming sheets
- C03B18/04—Changing or regulating the dimensions of the molten glass ribbon
- C03B18/06—Changing or regulating the dimensions of the molten glass ribbon using mechanical means, e.g. restrictor bars, edge rollers
Definitions
- the present invention relates to a glass sheet manufacturing apparatus, a glass sheet manufacturing method, and a molded body.
- the overflow / down-draw method is used as one of the glass sheet manufacturing methods.
- a glass sheet is continuously produced by joining molten glass that has been overflowed and shunted from a molded body at the lower end of the molded body.
- the molded body has a pair of inclined surfaces on which the overflowing molten glass flows down. These inclined surfaces are connected to each other at the lower end of the molded body. Ideally, it is desirable that the pair of molten glass flowing down the inclined surface is joined and fused at the lower end of the molded body without leaving the surface of the molded body. However, depending on the glass viscosity at the lower end of the molded body, the molten glass flowing down the inclined surface may be separated from the surface of the molded body before reaching the lower end of the molded body. A pair of molten glass once separated from the surface of the molded body is bonded again if the viscosity required for the merging surface to be fused is maintained at the merging point located below the lower end of the molded body, A glass sheet is formed.
- the molten glass separated from the molded body comes into contact with low-temperature air, so that the viscosity rises in a short time. If the viscosity of the molten glass rises too much, the molten glass does not fuse well at the joining point, and cracks and the like occur in the formed glass sheet, so that stable operation cannot be performed. In particular, at the end of the molded body, the viscosity of the molten glass rises due to the large area in contact with the external air and the low temperature rising airflow from the cooling device installed below.
- the molten glass flowing down the surface of the molded body tends to increase in viscosity at the end of the molded body and easily separate from the surface of the molded body.
- the temperature of the molten glass separated from the molded body is further lowered and the viscosity is further increased, so that the bonding of the molten glass at the joining point is deteriorated.
- the molded glass sheet may be cracked.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2009-518275 discloses a molded body in which a lower end portion is pointed and a conductive member is embedded. Since this molded body has a sharp lower end, the lower end tends to be partially lost. Depending on the degree, the partially-deleted molded body may cause a defective shape of the glass and thus cannot be practically used.
- the temperature of the molten glass which flows down the surface of a molded object is controlled by heating the embedded electroconductive member, and a molten glass is from the surface of a molded object. It can be prevented from leaving.
- a molded body made of refractory it is technically difficult to join the conductive member to the lower end of the molded body.
- the present invention is provided with a molded body with a low risk of partial defects, and a glass sheet production apparatus capable of producing a glass sheet that is less likely to have a defective shape at the end, using a molded body with a low risk of partial defects, And the glass sheet manufacturing method which can manufacture the glass sheet which does not produce the shape defect of an edge part easily, and the molded object which can manufacture the glass sheet which is low in the risk of a partial defect, and is difficult to generate
- the purpose is to provide.
- the glass sheet production apparatus is a glass sheet production apparatus provided with a molded body for forming a glass sheet by diverting molten glass to flow down and then fusing it in the vicinity of the lower end.
- the molded body has a first inclined surface, a second inclined surface, a third inclined surface, a first arc surface, and a second arc surface.
- a 1st inclined surface is a pair of inclined surface which inclines so that it may mutually approach toward the downward direction in the center part in the longitudinal direction of a molded object.
- a 2nd inclined surface is a pair of inclined surface which inclines so that it may mutually approach toward the downward direction in the both ends in the longitudinal direction of a molded object.
- the second inclined surface is inclined at the same angle as the first inclined surface.
- the third inclined surfaces are a pair of inclined surfaces that are connected to the lower ends of the second inclined surfaces at both ends in the longitudinal direction of the molded body and are inclined so as to approach each other downward.
- the third inclined surface is inclined at an angle closer to the horizontal than the second inclined surface.
- the first arc surface is an arc that is connected to the lower end of the first inclined surface at the center in the longitudinal direction of the molded body and has a cross-sectional shape in the short direction that is vertically downward.
- the second arc surface is an arc that is connected to the lower end of the third inclined surface at both end portions in the longitudinal direction of the molded body, and has a cross-sectional shape in the short direction that is vertically downward.
- the length of the second arc surface in the short direction is shorter than the length of the first arc surface in the short direction.
- the glass sheet manufacturing apparatus using the overflow / downdraw method includes a molded body for forming a glass sheet by fusing and then fusing the molten glass and then fusing it.
- a molded body for forming a glass sheet by fusing and then fusing the molten glass and then fusing it.
- the viscosity is likely to increase due to the large area in contact with the external air and the low temperature rising air flow from the cooling device installed below. Therefore, the molten glass flowing down at both ends in the longitudinal direction of the molded body is easily separated from the surface of the molded body.
- the glass sheet manufacturing apparatus moves the point at which the molten glass leaves at the lower end in the vertical direction as much as possible at both ends in the longitudinal direction of the molded body where the molten glass is easily separated. Thereby, fusion
- the point at which the molten glass is separated from the surface of the molded body is the viscosity of the molten glass flowing down the surface of the molded body (or the interfacial tension acting between the molten glass and the surface of the molded body at the viscosity), the melting point. It is considered to be determined by three factors: the magnitude of the force that pulls the molten glass attached vertically downward, and the angle formed by the tangent at the point on the arc of the cross section of the first arc surface and the second arc surface. .
- the glass sheet manufacturing apparatus preferably further includes a cooling roller.
- maintains the both ends of the width direction of the glass sheet shape
- the cooling roller is disposed vertically below the boundary line between the center portion and both end portions in the longitudinal direction of the molded body.
- the molten glass that has flowed down the boundary line between the central portion and both end portions in the longitudinal direction of the formed body becomes both ends in the width direction of the glass sheet after leaving the surface of the formed body. Both ends in the width direction of the glass sheet are later cut and removed.
- the radius of the arc of the cross section of the second arc surface in the short direction of the formed body is equal to or less than the radius of the arc of the cross section of the first arc surface in the short direction of the formed body. Is preferred.
- the molded body is preferably a refractory.
- the glass sheet manufacturing method according to the present invention is a glass sheet manufacturing method using a molded body for forming a glass sheet by diverting molten glass to flow down and then fusing it in the vicinity of the lower end.
- the molded body has a first inclined surface, a second inclined surface, a third inclined surface, a first arc surface, and a second arc surface.
- a 1st inclined surface is a pair of inclined surface which inclines so that it may mutually approach toward the downward direction in the center part in the longitudinal direction of a molded object.
- a 2nd inclined surface is a pair of inclined surface which inclines so that it may mutually approach toward the downward direction in the both ends in the longitudinal direction of a molded object.
- the second inclined surface is inclined at the same angle as the first inclined surface.
- the third inclined surfaces are a pair of inclined surfaces that are connected to the lower ends of the second inclined surfaces at both ends in the longitudinal direction of the molded body and are inclined so as to approach each other downward.
- the third inclined surface is inclined at an angle closer to the horizontal than the second inclined surface.
- the first arc surface is an arc that is connected to the lower end of the first inclined surface at the center in the longitudinal direction of the molded body and has a cross-sectional shape in the short direction that is vertically downward.
- the second arc surface is an arc that is connected to the lower end of the third inclined surface at both end portions in the longitudinal direction of the molded body, and has a cross-sectional shape in the short direction that is vertically downward.
- the length of the second arc surface in the short direction is shorter than the length of the first arc surface in the short direction.
- the molded body according to the present invention has a first inclined surface, a second inclined surface, a third inclined surface, a first arc surface, and a second arc surface.
- a 1st inclined surface is a pair of inclined surface which inclines so that it may mutually approach toward the downward direction in the center part in the longitudinal direction of a molded object.
- a 2nd inclined surface is a pair of inclined surface which inclines so that it may mutually approach toward the downward direction in the both ends in the longitudinal direction of a molded object.
- the second inclined surface is inclined at the same angle as the first inclined surface.
- the third inclined surfaces are a pair of inclined surfaces that are connected to the lower ends of the second inclined surfaces at both ends in the longitudinal direction of the molded body and are inclined so as to approach each other downward.
- the third inclined surface is inclined at an angle closer to the horizontal than the second inclined surface.
- the first arc surface is an arc that is connected to the lower end of the first inclined surface at the center in the longitudinal direction of the molded body and has a cross-sectional shape in the short direction that is vertically downward.
- the second arc surface is an arc that is connected to the lower end of the third inclined surface at both end portions in the longitudinal direction of the molded body, and has a cross-sectional shape in the short direction that is vertically downward.
- the length of the second arc surface in the short direction is shorter than the length of the first arc surface in the short direction.
- the glass sheet manufacturing apparatus, the glass sheet manufacturing method, and the molded body according to the present invention can manufacture a glass sheet that has a low risk of partial defect of the molded body and is less likely to have a defective shape at the end.
- FIG. 1 it is a figure showing the relationship between the interfacial tension between a molten glass and a circular arc surface, and the tensile force of a molten glass. It is an enlarged view of sectional drawing of the molded object shown by FIG. It is an expanded sectional view in the center part of the forming object concerning this embodiment. It is an expanded sectional view in the both ends of the forming object concerning this embodiment. It is the figure which piled up the expanded sectional view in the center part, and the expanded sectional view in both ends of the molded object which concerns on the modification of this embodiment.
- the glass sheet manufacturing apparatus 100 includes a dissolution tank 200, a clarification tank 300, and a molding apparatus 400.
- the melting tank 200 the glass raw material is melted to produce molten glass.
- the molten glass generated in the melting tank 200 is sent to the clarification tank 300.
- the clarification tank 300 bubbles contained in the molten glass are removed.
- the molten glass from which bubbles have been removed in the clarification tank 300 is sent to the molding apparatus 400.
- a glass ribbon is continuously formed from molten glass by the overflow downdraw method.
- the glass ribbon formed by the forming apparatus 400 is cut into a glass sheet having a predetermined size.
- the glass sheet is used as a glass substrate for flat panel displays such as liquid crystal displays and plasma displays.
- the molding apparatus 400 includes the molded body 10, the partition plate 20, the cooling roller 30, the plurality of feed rollers 50, and the furnace wall 90.
- the furnace wall 90 is made of refractory bricks and accommodates the molded body 10, the partition plate 20, the cooling roller 30, and the feed roller 50.
- the space inside the furnace wall 90 is partitioned into a molded body accommodation zone 410 and a molded slow cooling zone 420 from the upper side to the lower side in the vertical direction.
- the molded body accommodation zone 410 and the molded slow cooling zone 420 are partitioned by the partition plate 20.
- each component housed in the furnace wall 90 will be described.
- the molded body 10 is a refractory material having a wedge-shaped cross section in the lateral direction. As shown in FIG. 3, the molded body 10 is disposed in the molded body accommodation zone 410 such that the wedge-shaped tip of the cross section points downward in the vertical direction. The molded body 10 continuously forms a glass ribbon G from molten glass by an overflow downdraw method.
- the molded body 10 has an upper end surface 12, a pair of vertical side surfaces 14, a pair of inclined side surfaces 16, and an arc surface 18.
- the upper end surface 12 has a groove 12a formed in the longitudinal direction LD. One end of the groove 12 a is connected to the glass supply pipe 80.
- the upper end of the vertical side surface 14 is connected to both ends of the upper end surface 12 along the longitudinal direction LD.
- the upper end of the inclined side surface 16 is connected to the lower end of the vertical side surface 14 along the longitudinal direction LD.
- the pair of inclined side surfaces 16 are inclined so as to approach each other downward in the vertical direction.
- the upper end of the circular arc surface 18 is connected to the lower end of the inclined side surface 16 along the longitudinal direction LD.
- the arc surface 18 is an arc whose cross-sectional shape in the short direction SD is vertically downward.
- the molded body 10 has a shape in which the cross-sectional shape in the short direction SD differs depending on the point in the long direction LD.
- the inclined side surface 16 is a pair that occupies a predetermined range from both ends of the longitudinal direction LD of the molded body 10.
- the upper end inclined side surface 16a1 and the pair of end lower inclined side surfaces 16a2 and the central inclined side surface 16b sandwiched between the pair of end upper inclined side surfaces 16a1.
- the lower end of the end upper inclined side surface 16a1 is connected to the upper end of the end lower inclined side surface 16a2.
- the arc surface 18 includes a pair of end arc surfaces 18a connected to the pair of lower end inclined side surfaces 16a2, and a center arc surface 18b smoothly connected to the center inclined side surface 16b.
- FIG. 7 is an enlarged view of the lower part by overlapping the cross-sectional shapes of FIGS. 5 and 6.
- the end upper inclined side surface 16a1 and the central inclined side surface 16b are inclined at the same angle.
- the lower end inclined side surface 16a2 is inclined at an angle closer to the horizontal than the upper end inclined side surface 16a1.
- the end arc surface 18a has the same cross-sectional shape as a part of the lower end portion of the cross-sectional shape of the central arc surface 18b.
- the molded body 10 according to the present embodiment is obtained by machining both ends of the longitudinal direction LD by machining from a molded body having the cross-sectional shape shown in FIG. 5 over the entire area in the longitudinal direction LD.
- the lower end slope having an inclination angle different from that of the central inclined side face 16 b which is an inclined face before being cut by cutting a part of the inclined face and the arc face.
- the side surface 16a2 is formed, and at the same time, an end arc surface 18a having a shorter length in the short direction SD and a lower height in the vertical direction than the central arc surface 18b, which is an arc surface before cutting, is formed.
- the partition plate 20 is a heat insulating material disposed in the vicinity of the lower end of the molded body 10.
- the partition plate 20 is horizontally disposed on both sides of the glass ribbon G in the short direction SD.
- the partition plate 20 suppresses heat transfer between the molded body accommodation zone 410 and the molded slow cooling zone 420.
- the cooling roller 30 is a roller disposed in the vicinity of the partition plate 20 in the forming slow cooling zone 420. As shown in FIG. 2, the cooling roller 30 is positioned below the boundary line BL between the central inclined side surface 16 b and the end upper inclined side surface 16 a 1 in the vertical direction.
- the cooling rollers 30 are arranged on both sides of the glass ribbon G in the short direction SD on both sides of the glass ribbon G in the longitudinal direction LD.
- the cooling roller 30 cools the glass ribbon G molded in the molded body accommodation zone 410.
- the feed roller 50 is a roller disposed below the cooling roller 30 in the forming slow cooling zone 420.
- the feed rollers 50 are arranged on both sides of the glass ribbon G in the short direction SD on both sides of the glass ribbon G in the longitudinal direction LD.
- the feed roller 50a conveys the glass ribbon G conveyed by the cooling roller 30 downward.
- the pair of molten glass that has flowed down on both side surfaces of the molded body 10 is separated from the molded body 10 on the arc surface 18 and joins below the lower end of the molded body 10.
- the pair of molten glasses that have joined together are continuously formed into a glass ribbon G by being bonded together.
- the temperature of the glass ribbon G in the molded body accommodation zone 410 is about 1150 ° C.
- the glass ribbon G molded in the molded body accommodation zone 410 reaches the molding slow cooling zone 420.
- the central portion in the width direction of the glass ribbon G flows down without touching anything.
- both ends in the width direction of the glass ribbon G are selectively cooled to 800 to 900 ° C. by the cooling roller 30.
- the glass ribbon G is conveyed vertically downward by the feed roller 50.
- the glass ribbon G is gradually cooled in the process of being conveyed by the feed roller 50, and then is taken out of the molding apparatus 400.
- the pulling force F1 is a resultant force of the force acting on the molten glass by the feed roller 50 pulling both ends in the width direction of the glass ribbon G vertically downward and the gravity of the molten glass itself.
- normal component F1n means a component in a direction perpendicular to the arc tangent (broken line shown in FIG. 8) of the cross section of the arc surface 18 that passes through the force point AP of the tensile force F1.
- an angle ⁇ formed by the tangent line and a perpendicular line is referred to as an “inclination angle”.
- the interfacial tension F2 is a force acting in the direction opposite to the normal component F1n of the tensile force F1 from the point A of the tensile force F1.
- the normal component F1n of the tensile force F1 is calculated by multiplying the tensile force F1 and the sine of the inclination angle ⁇ (sin ⁇ ). Since the cross-sectional shape of the arc surface 18 is a vertically downward arc, the tangent line becomes closer to the horizontal and the inclination angle ⁇ increases as it goes downward.
- the normal component F1n of the tensile force F1 concerning a molten glass becomes large, so that it goes below. Then, at a point where the normal component F1n of the tensile force F1 exceeds the interfacial tension F2, the molten glass is separated from the surface of the molded body 10. Therefore, the molten glass is easily separated from the surface of the molded body 10 as it approaches the lower end of the circular arc surface 18 of the molded body 10.
- the molten glass that has flowed down the boundary line BL between the central inclined side surface 16b and the end upper inclined side surface 16a1 of the molded body 10 is bonded to the surface of the molded body 10 after being separated from the glass ribbon G. It becomes both ends in the width direction. Both ends in the width direction of the glass ribbon G flowing down the boundary line BL of the molded body 10 and coming into contact with the cooling roller 30 and the feeding roller 50 are cut later and are not used as products.
- both ends in the width direction of the glass ribbon G are selectively cooled by the cooling roller 30, and a low temperature rising airflow is generated from the cooling roller 30.
- the molten glass which flows down the surface of the molded object 10 is cooled when the said updraft penetrate
- the cooling roller 30 is positioned vertically below the boundary line BL between the central inclined side surface 16b and the end upper inclined side surface 16a1 of the molded body 10, the molten glass flowing down both ends in the longitudinal direction LD of the molded body 10 is It is cooled more strongly than the molten glass flowing down the center, and becomes a lower temperature.
- the viscosity of the molten glass flowing down the both end portions in the longitudinal direction LD of the molded body 10 is higher than the viscosity of the molten glass flowing down the center portion. Therefore, the interfacial tension acting between the surface of both ends of the molded body 10 in the longitudinal direction LD and the molten glass is also small as the interfacial tension acting between the surface of the central portion and the molten glass.
- the molded body 10 has a cross-sectional shape shown in FIG. 5 over the entire region in the longitudinal direction LD.
- the molten glass flowing down at both ends in the longitudinal direction LD of the molded body 10 has a lower interfacial tension than the molten glass flowing down at the central portion of the molded body 10 in the longitudinal direction LD.
- the circular arc surface where the inclination angle becomes larger as it goes it is separated further upward. The more the molten glass is separated above the surface of the molded body 10, the longer the interval from the time when the molten glass is separated from the molded body 10 to the time when the molten glass is merged at the merge point CP.
- the molten glass While the molten glass is away from the molded body 10, the molten glass comes into contact with low-temperature air, so that the viscosity increases in a short time. If the viscosity of the molten glass increases too much, the molten glass does not fuse well at the joining point CP, and there is a possibility that cracks and the like occur in the formed glass ribbon G.
- the inclined surface and a part of the arc surface are scraped at both ends in the longitudinal direction LD of the molded body 10 to have an inclination angle different from that of the upper end inclined side surface 16a1.
- An end lower inclined side surface 16a2 is formed, and at the same time, an end arc surface 18a having a shorter length in the lateral direction SD and a lower height in the vertical direction than the central arc surface 18b is formed.
- FIG. 9 shows an enlarged view of a cross-sectional view of the molded body 10 shown in FIG.
- the inclination angle of the lower end inclined side surface 16a2 is ⁇ 1
- the inclination angles of the upper end inclined side surface 16a1 and the central inclined side surface 16b are ⁇ 2.
- a connection point between the end lower inclined side surface 16a2 and the end arc surface 18a is BP1
- a connection point between the central inclined side surface 16b and the center arc surface 18b is BP2
- the inclination angle of the central portion of the molded body 10 in the longitudinal direction LD gradually increases from ⁇ 2 at the height position of the connection point BP2 to ⁇ 3 at the height position of the connection point BP1 as it proceeds downward.
- the inclination angle of both ends of the longitudinal direction LD of the molded body 10 increases from ⁇ 2 to ⁇ 1 at the height position of the connection point BP3, and a constant value of ⁇ 1 from the height position of the connection point BP3 to the height position of the connection point BP1.
- the inclination angle ⁇ 1 is larger than the inclination angle ⁇ 2
- the inclination angle ⁇ 3 is larger than the inclination angle ⁇ 1 ( ⁇ 3> ⁇ 1> ⁇ 2).
- the molded body 10 has the cross-sectional shape shown in FIG. 5 over the entire area in the longitudinal direction LD.
- the molten glass flowing down both ends in the longitudinal direction LD of the molded body 10 is separated from the surface of the molded body 10 at a point on the arc surface where the inclination angle is ⁇ (where ⁇ 2 ⁇ ⁇ 3). think of.
- an inclined surface having an inclination angle smaller than the inclination angle ⁇ is formed by cutting the inclined surface and the arc surface at both ends in the longitudinal direction LD of the molded body 10.
- the inclined surface having an inclination angle smaller than the inclination angle ⁇ corresponds to the lower end inclined side surface 16a2 having the inclination angle ⁇ 1.
- the molten glass flowing down both ends in the longitudinal direction LD of the molded body 10 has an end lower inclined side surface 16a2 having an inclination angle ⁇ 1 smaller than the inclination angle ⁇ required to leave the surface of the molded body 10. Since it flows down, it can flow down to the height position below the height position where the inclination angle becomes ⁇ in the central arc surface 18b without leaving the surface of the molded body 10.
- the center separation point DP2 which is the point at which the molten glass leaves the center arc surface 18b, is located on the center arc surface 18b.
- the end separation point DP1 which is the point at which the molten glass leaves the end arc surface 18a, is below the center separation point DP2, and is between the lower end inclined side surface 16a2 and the end arc surface 18a. Located near the connection point. That is, the distance from the end separation point DP1 to the lower end of the molded body 10 is shorter than the distance from the center separation point DP2 to the lower end of the molded body 10.
- the distance from the end separation point DP1 to the merge point CP is shorter than the distance from the center separation point DP2 to the merge point CP. Therefore, in the molded body 10 according to the present embodiment, the molten glass flowing down both ends of the longitudinal direction LD is more distant from the surface of the molded body 10 than the molten glass flowing down the central portion of the longitudinal direction LD. The interval until the time of merging at the merging point CP is short. Thereby, the molded object 10 which concerns on this embodiment can suppress that the viscosity of the molten glass which flowed down the both ends of longitudinal direction LD and left
- the molded body 10 according to the present embodiment can suppress the deterioration of the bonding at both ends in the width direction of the glass ribbon G.
- the molded body 10 according to the present embodiment it is possible to manufacture a glass sheet that is less likely to have a defective shape at the end.
- the molded body 10 according to the present embodiment can be obtained by machining a molded body having the cross-sectional shape shown in FIG. 5 over the entire area in the longitudinal direction LD.
- the pair of molten glasses that have flowed down on both side surfaces of the molded body merge at the lower end of the molded body and be formed into a glass ribbon without leaving the molded body.
- the molded body has a shape in which the lower end is completely pointed.
- the molded body is usually made of a refractory material having a low strength and a brittle material. Accordingly, a molded body having a completely sharpened lower end is not suitable for practical use because it has a high risk of partial loss in the life cycle from the start of processing to the end of operation through installation.
- the molded body 10 according to the present embodiment has an arc surface 18 at the lower end. Therefore, the molded body 10 according to the present embodiment is suitable for practical use as a manufacturing apparatus because it has a lower risk of partial loss compared to a molded body having a completely sharp lower end.
- the end arc surface 18a of the molded body 10 has the same cross-sectional shape as a part of the lower end portion of the central arc surface 18b, but may have a different cross-sectional shape.
- the arc-shaped radius Ra of the cross section of the end arc surface 118a connected to the lower end inclined side surface 116a2 is the radius of the arc shape of the cross section of the central arc surface 118b connected to the central inclined side surface 116b. It may be smaller than Rb.
- the upper end of the lower end inclined side surface 116a2 is connected to the lower end of the upper end inclined side surface 116a1.
- the central arc surface 18b is smoothly connected to the central inclined side surface 16b, but the end arc surface 18a is discontinuously connected to the lower end inclined side surface 16a2. Therefore, when the molten glass that has reached the lower end of the lower end inclined side surface 16a2 does not flow down the end arc surface 18a, the molten glass leaves the molded body 10 at a discontinuous point between the lower end inclined side surface 16a2 and the end arc surface 18a. There is.
- the molded body 110 in this modification has the end arc surface 118a machined so that the end arc surface 118a is smoothly connected to the lower end inclined side surface 116a2. Thereby, the molten glass which flowed down the end lower inclined side surface 116a2 of the molded body 110 can flow down the end arc surface 118a. Also in this modification, by using the molded body 110, it is possible to manufacture a glass sheet that is less likely to have a defective shape at the end.
- the glass sheet manufacturing apparatus, the glass sheet manufacturing method, and the molded body according to the present invention can manufacture a glass sheet that has a low risk of partial defect of the molded body and is less likely to have a defective shape at the end.
- Molding body 12 Upper end surface 12a Groove 14 Vertical side surface 16 Inclined side surface 16a1 2nd inclined surface (Upper end inclined side surface) 16a2 Third inclined surface (lower end inclined side surface) 16b 1st inclined surface (central inclined side surface) 18 Arc surface 18a Second arc surface (end arc surface) 18b First arc surface (central arc surface) 20 Partition plate 30 Cooling roller 50 Feeding roller 80 Glass supply pipe 90 Furnace wall 100 Glass sheet manufacturing apparatus 200 Dissolution tank 300 Clarification tank 400 Molding apparatus 410 Molded body accommodation zone 420 Molding slow cooling zone G Glass ribbon CP Merge point DP1 End separation point DP2 center separation point
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
- Glass Compositions (AREA)
- Surface Treatment Of Glass (AREA)
Abstract
Description
本発明の実施形態に係るガラスシート製造装置100の全体構成について、図1を参照しながら説明する。ガラスシート製造装置100は、溶解槽200と、清澄槽300と、成形装置400とから構成される。溶解槽200では、ガラスの原料が溶解されて、溶融ガラスが生成される。溶解槽200で生成された溶融ガラスは、清澄槽300へ送られる。清澄槽300では、溶融ガラスに含まれる気泡の除去が行われる。清澄槽300で気泡が除去された溶融ガラスは、成形装置400へ送られる。成形装置400では、オーバーフロー・ダウンドロー法によって、溶融ガラスからガラスリボンが連続的に成形される。成形装置400で成形されたガラスリボンは、所定の大きさのガラスシートに切断される。ガラスシートは、液晶ディスプレイやプラズマディスプレイなどのフラットパネルディスプレイ用のガラス基板として用いられる。
成形装置400の詳細な構成について、図2および図3を参照しながら説明する。成形装置400は、成形体10と、仕切り板20と、冷却ローラ30と、複数の送りローラ50と、炉壁90とから構成される。炉壁90は、耐火煉瓦で作られ、成形体10と、仕切り板20と、冷却ローラ30と、送りローラ50とを収容する。炉壁90の内部の空間は、鉛直方向上方から下方に向かって、成形体収容ゾーン410と、成形徐冷ゾーン420とに区画される。成形体収容ゾーン410と成形徐冷ゾーン420は、仕切り板20によって仕切られる。以下、炉壁90の内部に収容される各構成要素について説明する。
成形体10は、短手方向の断面が楔形状である耐火物である。図3に示されるように、成形体10は、断面の楔形状の尖端が鉛直方向下方を指すように、成形体収容ゾーン410に配置される。成形体10は、オーバーフロー・ダウンドロー法によって溶融ガラスからガラスリボンGを連続的に成形する。
仕切り板20は、成形体10の下端の近傍に配置される断熱材である。仕切り板20は、短手方向SDのガラスリボンGの両側に水平に配置される。仕切り板20は、成形体収容ゾーン410と成形徐冷ゾーン420との間の熱移動を抑制する。
冷却ローラ30は、成形徐冷ゾーン420において、仕切り板20の近傍に配置されるローラである。冷却ローラ30は、図2に示されるように、成形体10の中央傾斜側面16bと端上部傾斜側面16a1との境界線BLの鉛直方向下方に位置する。冷却ローラ30は、長手方向LDのガラスリボンGの両側において、短手方向SDのガラスリボンGの両側に配置される。冷却ローラ30は、成形体収容ゾーン410で成形されたガラスリボンGを冷却する。
送りローラ50は、成形徐冷ゾーン420において、冷却ローラ30の下方に配置されるローラである。送りローラ50は、長手方向LDのガラスリボンGの両側において、短手方向SDのガラスリボンGの両側に配置される。送りローラ50aは、冷却ローラ30によって搬送されたガラスリボンGを下方に搬送する。
(3-1)ガラスリボンの成形工程
成形装置400でガラスリボンGが成形される過程について、図2および図3を参照しながら説明する。溶解槽200で生成され、清澄槽300で気泡が除去された溶融ガラスは、成形装置400に送られる。成形装置400の成形体収容ゾーン410で、溶融ガラスは、ガラス供給管80を介して成形体10の溝12aに供給される。溝12aに貯留された溶融ガラスは、上端面12からオーバーフローして、成形体10の短手方向SDに分流する。分流した一対の溶融ガラスは、垂直側面14および傾斜側面16を伝って流下する。成形体10の両側面を流下した一対の溶融ガラスは、円弧面18において成形体10から離れて、成形体10の下端の下方で合流する。合流した一対の溶融ガラスは、互いに貼り合わされることによって、ガラスリボンGに連続的に成形される。成形体収容ゾーン410におけるガラスリボンGの温度は、約1150℃である。
成形体収容ゾーン410において、一対の溶融ガラスが成形体10の表面から離れて合流する過程について、図8を参照しながら説明する。円弧面18の短手方向SDの接線は、鉛直方向下方に進むに従って、徐々に水平方向に近づく。そのため、溶融ガラスが円弧面18を伝って流下する際に、溶融ガラスと円弧面18との間の界面張力F2に、所要速度でのガラスリボンGの成形に必要な、溶融ガラスに係る鉛直方向下方への連続した引っ張り力F1が打ち克つことによって、溶融ガラスが円弧面18から離れる。ここで、引っ張り力F1は、送りローラ50がガラスリボンGの幅方向の両端部を鉛直方向下方に引っ張ることによって溶融ガラスに作用する力と、溶融ガラス自体の重力との合力である。一旦、円弧面18から離れた一対の溶融ガラスは、成形体10の下端の下方に位置する合流ポイントCPで、融着に必要な粘度以下に未だ保たれていれば、再び融着して貼り合わされる。
(4-1)
本実施形態における成形体10では、冷却ローラ30によってガラスリボンGの幅方向両端部が選択的に冷却されて、冷却ローラ30から低温の上昇気流が生じる。そして、当該上昇気流が成形体収容ゾーン410に侵入することにより、成形体10の表面を流下する溶融ガラスが冷却される。冷却ローラ30は、成形体10の中央傾斜側面16bと端上部傾斜側面16a1との境界線BLの鉛直方向下方に位置するので、成形体10の長手方向LDの両端部を流下する溶融ガラスは、中央部を流下する溶融ガラスよりも強く冷却されて、より低温になる。そのため、成形体10の長手方向LDの両端部を流下する溶融ガラスの粘度は、中央部を流下する溶融ガラスの粘度よりも高い。従って、成形体10の長手方向LDの両端部の表面と溶融ガラスとの間に作用する界面張力は、中央部の表面と溶融ガラスとの間に作用する界面張力も小さい。
成形体10の長手方向LDの両端部の傾斜角は、接続点BP3の高さ位置においてθ2からθ1に増加し、接続点BP3の高さ位置から接続点BP1の高さ位置までθ1の一定値を保持し、接続点BP1の高さ位置においてθ1からθ3に不連続に増加する。本実施形態において、傾斜角θ1は傾斜角θ2より大きく、傾斜角θ3は傾斜角θ1より大きい(θ3>θ1>θ2)。
本実施形態に係る成形体10は、図5に示される断面形状を長手方向LDの全域に亘って有する成形体を、機械加工することによって得ることができる。本実施形態では、成形体10の長手方向LDの両端部を流下する溶融ガラスの温度が低下することを抑制するために、成形体10の内部および外部に特別な装置や機構を設ける必要がない。従って、本実施形態に係る成形体10を用いることによって、ガラスリボンGの形状不良の防止のためのコストの削減を図ることができる。
一般的に、オーバーフロー・ダウンドロー法では、成形体の両側面を流下した一対の溶融ガラスは、成形体から離れることなく、成形体の下端において合流してガラスリボンに成形されることが望ましい。そのためには、成形体は、下端が完全に尖っている形状を有することが最も望ましい形態である。しかし、通常、成形体は、強度が低く、脆い材質である耐火物で作られる。従って、完全に尖っている下端を有する成形体は、加工開始から設置を経て稼動終了までのライフサイクルの中で部分欠損するリスクが高いので、実用には不向きである。
本実施形態では、成形体10の端円弧面18aは、中央円弧面18bの下端部の一部と同じ断面形状を有するが、異なる断面形状を有してもよい。例えば、図12に示されるように、端下部傾斜側面116a2と接続する端円弧面118aの断面の円弧形状の半径Raが、中央傾斜側面116bと接続する中央円弧面118bの断面の円弧形状の半径Rbよりも小さくてもよい。端下部傾斜側面116a2の上端は、端上部傾斜側面116a1の下端と接続されている。
12 上端面
12a 溝
14 垂直側面
16 傾斜側面
16a1 第2傾斜面(端上部傾斜側面)
16a2 第3傾斜面(端下部傾斜側面)
16b 第1傾斜面(中央傾斜側面)
18 円弧面
18a 第2円弧面(端円弧面)
18b 第1円弧面(中央円弧面)
20 仕切り板
30 冷却ローラ
50 送りローラ
80 ガラス供給管
90 炉壁
100 ガラスシート製造装置
200 溶解槽
300 清澄槽
400 成形装置
410 成形体収容ゾーン
420 成形徐冷ゾーン
G ガラスリボン
CP 合流ポイント
DP1 端離間ポイント
DP2 中央離間ポイント
Claims (6)
- 溶融ガラスを分流させて流下させた後、下端部の近傍で融着させてガラスシートを成形するための成形体を備えるガラスシート製造装置であって、
前記成形体は、
長手方向における中央部において、下方に向かって互いに接近するように傾斜している一対の傾斜面である第1傾斜面と、
長手方向における両端部において、下方に向かって互いに接近するように傾斜している一対の傾斜面であって、前記第1傾斜面と同じ角度で傾斜している第2傾斜面と、
前記両端部において、前記第2傾斜面のそれぞれの下端と接続し、かつ、下方に向かって互いに接近するように傾斜している一対の傾斜面であって、前記第2傾斜面と比べてより水平に近い角度で傾斜している第3傾斜面と、
前記中央部において、前記第1傾斜面の下端と接続し、かつ、短手方向における断面の形状が垂直下向きの円弧である第1円弧面と、
前記両端部において、前記第3傾斜面の下端と接続し、かつ、短手方向における断面の形状が垂直下向きの円弧である第2円弧面と、
を有し、
前記第2円弧面の短手方向の長さは、前記第1円弧面の短手方向の長さよりも短い、
ガラスシート製造装置。 - 前記成形体によって成形されたガラスシートの幅方向の両端部を保持する冷却ローラをさらに備え、
前記冷却ローラは、前記中央部と前記両端部との境界線の垂直下方に配置される、
請求項1に記載のガラスシート製造装置。 - 前記成形体の短手方向における前記第2円弧面の断面の円弧の半径は、前記成形体の短手方向における前記第1円弧面の断面の円弧の半径以下である、
請求項1または2に記載のガラスシート製造装置。 - 前記成形体は耐火物である、
請求項1から3のいずれか1項に記載のガラスシート製造装置。 - 溶融ガラスを分流させて流下させた後、合流させてガラスシートを成形するための成形体を用いるガラスシート製造方法であって、
前記成形体は、
長手方向における中央部において、下方に向かって互いに接近するように傾斜している一対の傾斜面である第1傾斜面と、
長手方向における両端部において、下方に向かって互いに接近するように傾斜している一対の傾斜面であって、前記第1傾斜面と同じ角度で傾斜している第2傾斜面と、
前記両端部において、前記第2傾斜面のそれぞれの下端と接続し、かつ、下方に向かって互いに接近するように傾斜している一対の傾斜面であって、前記第2傾斜面と比べてより水平に近い角度で傾斜している第3傾斜面と、
前記中央部において、前記第1傾斜面の下端と接続し、かつ、短手方向における断面の形状が垂直下向きの円弧である第1円弧面と、
前記両端部において、前記第3傾斜面の下端と接続し、かつ、短手方向における断面の形状が垂直下向きの円弧である第2円弧面と、
を有し、
前記第2円弧面の短手方向の長さは、前記第1円弧面の短手方向の長さよりも短い、
ガラスシート製造方法。 - 溶融ガラスを分流させて流下させた後、合流させてガラスシートを成形するための成形体であって、
長手方向における中央部において、下方に向かって互いに接近するように傾斜している一対の傾斜面である第1傾斜面と、
長手方向における両端部において、下方に向かって互いに接近するように傾斜している一対の傾斜面であって、前記第1傾斜面と同じ角度で傾斜している第2傾斜面と、
前記両端部において、前記第2傾斜面のそれぞれの下端と接続し、かつ、下方に向かって互いに接近するように傾斜している一対の傾斜面であって、前記第2傾斜面と比べてより水平に近い角度で傾斜している第3傾斜面と、
前記中央部において、前記第1傾斜面の下端と接続し、かつ、短手方向における断面の形状が垂直下向きの円弧である第1円弧面と、
前記両端部において、前記第3傾斜面の下端と接続し、かつ、短手方向における断面の形状が垂直下向きの円弧である第2円弧面と、
を備え、
前記第2円弧面の短手方向の長さは、前記第1円弧面の短手方向の長さよりも短い、
成形体。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201290000116XU CN203159429U (zh) | 2011-03-31 | 2012-03-27 | 玻璃片材制造装置及成形体 |
KR1020127027755A KR101266699B1 (ko) | 2011-03-31 | 2012-03-27 | 유리 시트 제조 장치, 유리 시트 제조 방법 및 성형체 |
JP2012525565A JP5132012B2 (ja) | 2011-03-31 | 2012-03-27 | ガラスシート製造装置、ガラスシート製造方法および成形体 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2011081207 | 2011-03-31 | ||
JP2011-081207 | 2011-03-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2012133463A1 true WO2012133463A1 (ja) | 2012-10-04 |
Family
ID=46931175
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2012/058017 WO2012133463A1 (ja) | 2011-03-31 | 2012-03-27 | ガラスシート製造装置、ガラスシート製造方法および成形体 |
Country Status (5)
Country | Link |
---|---|
JP (1) | JP5132012B2 (ja) |
KR (1) | KR101266699B1 (ja) |
CN (1) | CN203159429U (ja) |
TW (1) | TWI403472B (ja) |
WO (1) | WO2012133463A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2016069225A (ja) * | 2014-09-30 | 2016-05-09 | AvanStrate株式会社 | ガラス基板の製造方法、および、ガラス基板の製造装置 |
JP2016069226A (ja) * | 2014-09-30 | 2016-05-09 | AvanStrate株式会社 | ガラス基板の製造方法、および、ガラス基板の製造装置 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104765894A (zh) * | 2014-01-06 | 2015-07-08 | 北京华大九天软件有限公司 | 一种关于截面图的倒角方法 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008069024A (ja) * | 2006-09-13 | 2008-03-27 | Tanaka Kikinzoku Kogyo Kk | フュージョンダウンドロー法による板ガラスの製造方法 |
JP2008133174A (ja) * | 2006-10-24 | 2008-06-12 | Nippon Electric Glass Co Ltd | ガラスリボンの製造装置及びその製造方法 |
JP2009535290A (ja) * | 2006-04-28 | 2009-10-01 | コーニング インコーポレイテッド | エッジ安定性が増大したガラス基板の成形装置および方法 |
JP2010533640A (ja) * | 2007-07-19 | 2010-10-28 | コーニング インコーポレイテッド | ガラスシートの形成方法および装置 |
WO2011007681A1 (ja) * | 2009-07-13 | 2011-01-20 | 旭硝子株式会社 | ガラス板の製造方法及び製造装置 |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5005717B2 (ja) * | 2009-03-13 | 2012-08-22 | AvanStrate株式会社 | ガラス板の製造方法および製造装置 |
-
2012
- 2012-03-27 KR KR1020127027755A patent/KR101266699B1/ko active IP Right Grant
- 2012-03-27 CN CN201290000116XU patent/CN203159429U/zh not_active Expired - Lifetime
- 2012-03-27 JP JP2012525565A patent/JP5132012B2/ja active Active
- 2012-03-27 WO PCT/JP2012/058017 patent/WO2012133463A1/ja active Application Filing
- 2012-03-30 TW TW101111537A patent/TWI403472B/zh active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009535290A (ja) * | 2006-04-28 | 2009-10-01 | コーニング インコーポレイテッド | エッジ安定性が増大したガラス基板の成形装置および方法 |
JP2008069024A (ja) * | 2006-09-13 | 2008-03-27 | Tanaka Kikinzoku Kogyo Kk | フュージョンダウンドロー法による板ガラスの製造方法 |
JP2008133174A (ja) * | 2006-10-24 | 2008-06-12 | Nippon Electric Glass Co Ltd | ガラスリボンの製造装置及びその製造方法 |
JP2010533640A (ja) * | 2007-07-19 | 2010-10-28 | コーニング インコーポレイテッド | ガラスシートの形成方法および装置 |
WO2011007681A1 (ja) * | 2009-07-13 | 2011-01-20 | 旭硝子株式会社 | ガラス板の製造方法及び製造装置 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2016069225A (ja) * | 2014-09-30 | 2016-05-09 | AvanStrate株式会社 | ガラス基板の製造方法、および、ガラス基板の製造装置 |
JP2016069226A (ja) * | 2014-09-30 | 2016-05-09 | AvanStrate株式会社 | ガラス基板の製造方法、および、ガラス基板の製造装置 |
Also Published As
Publication number | Publication date |
---|---|
KR101266699B1 (ko) | 2013-05-28 |
KR20120127745A (ko) | 2012-11-23 |
TW201245056A (en) | 2012-11-16 |
TWI403472B (zh) | 2013-08-01 |
CN203159429U (zh) | 2013-08-28 |
JPWO2012133463A1 (ja) | 2014-07-28 |
JP5132012B2 (ja) | 2013-01-30 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
TWI725945B (zh) | 具有已定應力輪廓的玻璃物件 | |
JP5724552B2 (ja) | 薄板ガラス製造装置 | |
KR101372609B1 (ko) | 유리판의 제조 방법 | |
KR101476480B1 (ko) | 유리 시트 성형 방법 및 장치 | |
JP2019521944A (ja) | ガラスリボン縁部を冷却する方法及び装置 | |
JP5132012B2 (ja) | ガラスシート製造装置、ガラスシート製造方法および成形体 | |
TWI605022B (zh) | Glass substrate for display | |
KR102655115B1 (ko) | 유리 물품의 제조 방법 | |
KR20170129224A (ko) | 유리 리본의 가장자리를 제거하기 위한 방법 및 장치 | |
JP6489783B2 (ja) | ガラス基板の製造方法、および、ガラス基板の製造装置 | |
CN107108320B (zh) | 用于对玻璃片进行划线的方法和系统 | |
JP4955717B2 (ja) | ガラス成形装置 | |
CN109694176A (zh) | 玻璃熔化炉以及玻璃物品的制造方法 | |
CN216513458U (zh) | 溢流槽及溢流成型装置 | |
TWI820179B (zh) | 用於製造玻璃帶的設備以及方法 | |
WO2011122195A1 (ja) | 薄板ガラスおよびその製造方法 | |
JP2009298665A (ja) | 板ガラス製造装置および板ガラス製造方法 | |
JP5892986B2 (ja) | 複合式ガラス成形システム | |
TW202142504A (zh) | 用於製造玻璃帶的方法及設備 | |
JP6352755B2 (ja) | ガラス基板の製造方法、および、ガラス基板の製造装置 | |
JP6529805B2 (ja) | ガラス板の製造方法、及び、ガラス板の製造装置 | |
JP6498933B2 (ja) | ディスプレイ用ガラス基板の製造方法および製造装置 | |
US10377654B2 (en) | Apparatus and method of manufacturing composite glass articles | |
JP5537278B2 (ja) | ガラス板、プレス成形用素材、光学素子、薄板ガラスそれぞれの製造方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 201290000116.X Country of ref document: CN |
|
ENP | Entry into the national phase |
Ref document number: 2012525565 Country of ref document: JP Kind code of ref document: A |
|
ENP | Entry into the national phase |
Ref document number: 20127027755 Country of ref document: KR Kind code of ref document: A |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 12765810 Country of ref document: EP Kind code of ref document: A1 |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 12765810 Country of ref document: EP Kind code of ref document: A1 |