WO2013157478A1 - Dispositif et procédé de production d'une feuille de verre et dispositif de roulage de bord destiné à la production de verre flotté - Google Patents

Dispositif et procédé de production d'une feuille de verre et dispositif de roulage de bord destiné à la production de verre flotté Download PDF

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Publication number
WO2013157478A1
WO2013157478A1 PCT/JP2013/060926 JP2013060926W WO2013157478A1 WO 2013157478 A1 WO2013157478 A1 WO 2013157478A1 JP 2013060926 W JP2013060926 W JP 2013060926W WO 2013157478 A1 WO2013157478 A1 WO 2013157478A1
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WO
WIPO (PCT)
Prior art keywords
glass
barrel head
end side
outer peripheral
glass ribbon
Prior art date
Application number
PCT/JP2013/060926
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English (en)
Japanese (ja)
Inventor
伊賀　元一
白石　喜裕
真毅 後藤
Original Assignee
旭硝子株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 旭硝子株式会社 filed Critical 旭硝子株式会社
Priority to CN201380020529.3A priority Critical patent/CN104245606A/zh
Priority to KR20147029124A priority patent/KR20150002677A/ko
Publication of WO2013157478A1 publication Critical patent/WO2013157478A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B18/00—Shaping glass in contact with the surface of a liquid
    • C03B18/02—Forming sheets
    • C03B18/04—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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
    • Y02P40/57—Improving the yield, e-g- reduction of reject rates

Definitions

  • the present invention relates to an apparatus and method for manufacturing a thin glass plate according to a float bath method, and an edge roll apparatus for manufacturing float glass applied to them.
  • glass substrates for flat panel displays such as liquid crystal displays and plasma displays have been increased in size and thickness.
  • a float method is known in which a float bath in which a molten metal such as metallic tin is stored is used and a molten glass is thinly stretched in the horizontal direction on the molten metal.
  • a molten glass is floated on the molten metal of the float bath to ensure a necessary thickness according to the purpose, and a strip-shaped glass ribbon can be formed by drawing the molten glass in the horizontal direction.
  • a glass substrate having a desired size can be obtained by cutting the glass ribbon into a required size.
  • a top roll (T / T) that pulls both ends in the width direction of the glass ribbon outward on the molten metal of the float bath.
  • a forming apparatus called R is provided, and a method is adopted in which the glass ribbon is stretched to both ends in the width direction to reduce the thickness.
  • a thin glass ribbon is slowly cooled and then cut into a required size, followed by polishing and washing, whereby a target glass substrate can be obtained.
  • large and thin glass substrates are produced in large quantities, and large glass substrates having a thickness of about 0.7 mm and a length and width of several meters are produced as glass substrates.
  • a large amount of portable information terminal devices have been manufactured.
  • a liquid crystal panel applied to the portable information terminal device a liquid crystal panel using a glass substrate having a thickness of about 0.7 mm is used.
  • FIG. 10 shows an example of a float bath used in the float process.
  • the float bath 100 includes a bottom bath 102 having a molten metal 101 such as molten tin inside, and a molten bath is formed on the inlet side of the bottom bath 102.
  • Molten glass 103 flows in from the furnace hearth.
  • the molten glass 103 is stretched to a target width on the molten metal 101 by a plurality of top rolls 105 and gradually cooled to form a glass ribbon 106 having a required width and thickness.
  • a top roll 105 applied to this type of float bath 100, a barrel head 105A formed in a disk shape as shown in FIG.
  • the provided top roll is known.
  • the barrel head 105A shown in FIG. 11 adjusts the width of the molten glass 103 by applying an outward tensile force to the edge portion 103a while biting the outer peripheral blades 105a and 105a into the edge portion 103a of the molten glass 103.
  • the width and thickness of the ribbon 106 can be adjusted.
  • glass substrates tend to be made thinner and the use of a glass substrate having a thickness of about 0.3 mm as a glass substrate for a panel of a portable information terminal device has been studied from the beginning. Yes. Further, there is a demand for further thinning of glass substrates for flat panel displays.
  • the molten glass 103 immediately after being poured into the float bath 100 and being expanded cannot be easily pulled because it is liquid at high temperature, but the molten glass 103 moves from the upstream region to the downstream region of the float bath 100. As it is gradually cooled and the viscosity gradually increases, the molten glass 103 having increased viscosity can be pulled and expanded by the barrel head 105A.
  • FIG. 12 is a diagram for explaining a state in which the barrel head 105A is pressed from above with a strong force against the edge portion 103a of the molten glass 103.
  • FIG. 12 When the barrel head 105A is strongly pressed against the edge portion 103a of the molten glass 103 shown in FIG. 12A as shown in FIG. 12B, the edge portion 103a sinks deeply in proportion to the pressing force of the barrel head 105A. It is transformed into a U-shaped bag shape. If the deformed glass is solidified in this bag state, there is a problem that a local deformation portion 110 called a straw having a T-shaped cross section is generated as shown in FIG.
  • the cross section may be deformed into an S shape as shown in FIG.
  • a local deformation portion 111 called a straw is generated that is deformed so that the deformation portion overlaps the upper bag portion 111a and the lower bag portion 111b.
  • the molten metal may be caught inside the glass as shown by arrows a and b in FIG. 12 (c). There is a problem that causes the glass to break in the cooling process.
  • the generation of the locally deformed portions 110 and 111 is conspicuous in a thin glass plate, particularly when a glass plate having a thickness of 1 mm or less is manufactured by the float method like the glass substrate for a display device described above. There is a problem to do. Furthermore, in order to apply a strong tensile force to the molten glass 103 without difficulty, a large number of barrel heads 105A are arranged along the edge portion 103a of the molten glass 103, and the tensile force is applied by the more barrel heads 105A. Is also considered effective. Further, the flatness of the molten glass 103 decreases as the installation interval of the barrel head 105A is increased. However, as shown in FIG.
  • the rotation axis of the barrel head 105A is inclined with respect to the width and direction of the float bath 100 at various angles according to the viscosity and hardness of each position of the molten glass 103.
  • the present inventor has made various studies on a technique for producing a thin glass ribbon of 1 mm or less by forming molten glass by a float process.
  • the inventors When forming a ribbon, the inventors have found that the occurrence of a locally deformed portion called a straw can be suppressed by devising the position of applying a tension and the barrel head of the top roll used therefor, and have reached the present invention.
  • Another object of the present invention is to provide a technique capable of arranging the installation intervals of the barrel heads provided in the float bath closer than ever.
  • the present invention can produce a glass ribbon without causing a local deformation portion, and contributes to stable production of a glass plate, a glass plate production method, a production apparatus, and a float. It aims at provision of the edge roll apparatus for glass manufacture.
  • the present invention includes a float bath for storing molten metal, forming a glass ribbon by moving a molten glass from an upstream area to a downstream area of the molten path, wherein a molten glass moving path is formed on the molten metal.
  • a plurality of pairs of top rolls disposed on both sides in the width direction of the movement path from the upstream area to the downstream area of the movement path in the float bath, the top rolls on both sides in the width direction of the movement path of the molten glass.
  • the present invention relates to a glass plate manufacturing apparatus in which the rotational speed of the outer peripheral blade on the front end side of the composite barrel head is set larger than the rotational speed of the outer peripheral blade on the rear end side.
  • the present invention relates to the apparatus for producing a glass plate as described above, wherein the diameter of the outer peripheral blade on the front end side of the composite barrel head is formed larger than the diameter of the outer peripheral blade on the rear end side.
  • the composite barrel head has a composite structure of a front end side barrel head having an outer peripheral blade and a rear end side barrel head having an outer peripheral blade, and a rear end side rotation shaft to which the rear end side barrel head is attached is hollow.
  • the present invention relates to the apparatus for manufacturing a glass plate according to any one of the above, wherein the rotation axis of the front end side barrel head extends so as to pass through the rear end side rotation axis and the rear end side barrel head.
  • the region where the logarithmic value of the viscosity of the glass ribbon is 5.29 to 6.37 dPa ⁇ s is set as the middle flow region of the moving path of the molten glass, and the composite barrel head is disposed in the middle flow region.
  • the present invention relates to a glass plate manufacturing apparatus.
  • the present invention relates to the apparatus for producing a glass plate according to any one of the above, wherein the glass ribbon formed by the float bath has a thickness of 1 mm or less.
  • This invention relates to the manufacturing apparatus of the glass plate as described in any one of the above to which the alkali free glass which has the following compositions is applied as said molten glass in the mass percentage display of an oxide basis.
  • SiO 2 50 to 73%
  • Al 2 O 3 10.5 to 24%
  • B 2 O 3 0 to 12%
  • SrO: 0 to 24% BaO: 0 to 13.5%
  • ZrO 2 0 to 5%.
  • This invention relates to the manufacturing apparatus of the glass plate as described in any one of the above to which the alkali free glass which has the following compositions is applied as said molten glass in the mass percentage display of an oxide basis.
  • SiO 2 58 to 66%
  • Al 2 O 3 15 to 22%
  • B 2 O 3 5 to 12%
  • CaO 0 to 9%
  • SrO 3 to 12.5%
  • ZrO 2 0 to 5%.
  • This invention is a manufacturing apparatus of the glass plate as described in any one of the above to which the alkali free glass which has the following compositions is applied as said molten glass in the mass percentage display of an oxide basis.
  • SiO 2 54 to 73%
  • Al 2 O 3 10.5 to 22.5%
  • B 2 O 3 0 to 5.5%
  • the present invention relates to a method of manufacturing a glass plate in which a glass ribbon is manufactured by moving a molten glass along a moving path of a molten glass provided on the molten metal, from an upstream area to a downstream area of the moving path.
  • a glass ribbon by applying an outward tensile force to both ends of the glass ribbon by a plurality of pairs of top rolls arranged at both ends in the width direction of the movement path, the top roll is moved along the movement path.
  • the barrel head includes a barrel head that pulls outward while pressing a width direction end of the glass ribbon conveyed from the upstream region to the downstream region, and the barrel head includes a plurality of rows of outer peripheral blades on a cylindrical outer peripheral wall, and the outer periphery thereof.
  • a composite barrel head that rotates while pressing a blade against a width direction end of the glass ribbon to apply a tensile force to the glass ribbon,
  • the peripheral blade and the outer peripheral blade on the rear end side thereof are provided independently to be rotatable, and the outer peripheral blade on the rear end side of the composite barrel head is subjected to a tensile force acting on the glass ribbon from the outer peripheral blade on the front end side.
  • the present invention relates to a method for manufacturing a glass plate in which a glass ribbon is formed while applying a tensile force in a direction in which the glass ribbon is expanded by making it larger than a tensile force applied to a glass ribbon from a blade.
  • the present invention uses the composite barrel head in which the rotational speed of the outer peripheral blade on the front end side is larger than the rotational speed of the outer peripheral blade on the rear end side as the composite barrel head, so that the target tensile force is applied to the end of the glass ribbon.
  • the present invention relates to a method for producing a glass plate as described above.
  • the present invention uses the composite barrel head in which the diameter of the outer peripheral blade on the front end side is larger than the diameter of the outer peripheral blade on the rear end side as the composite barrel head to apply a target tensile force to the end of the glass ribbon. It relates to the manufacturing method of the glass plate as described above.
  • any one of the above-mentioned cases where the composite barrel head is installed in the middle flow area in which the logarithm of the viscosity of the glass ribbon is in the middle flow area of the moving path of the molten glass is 5.29-6.37 dPa ⁇ s. It relates to the manufacturing method of the glass plate as described in above. This invention relates to the manufacturing method of the glass plate as described in any one of the above using the alkali free glass which has the following compositions in the mass percentage display of an oxide basis as said molten glass.
  • This invention relates to the manufacturing method of the glass plate as described in any one of the above using the alkali free glass which has the following compositions in the mass percentage display of an oxide basis as said molten glass.
  • This invention relates to the manufacturing method of the glass plate as described in any one of the above using the alkali free glass which has the following compositions in the mass percentage display of an oxide basis as said molten glass.
  • SiO 2 54 to 73% Al 2 O 3 : 10.5 to 22.5%
  • B 2 O 3 0 to 5.5%
  • the present invention is an edge roll apparatus for manufacturing a float glass, which is installed in a float bath that supplies molten glass onto a molten metal to form a glass ribbon and applies a tensile force outwardly to the widthwise end of the glass ribbon.
  • a rotating shaft disposed so as to be able to approach and separate from the end of the glass ribbon, and a composite barrel head that is attached to the tip of the rotating shaft and includes a plurality of rows of outer peripheral blades on a cylindrical outer peripheral wall,
  • the plurality of rows of outer peripheral blades formed on the outer peripheral wall of the composite barrel head are outer peripheral blades that bite into the glass surface when the composite barrel head is pressed against the surface of the glass ribbon to apply a tensile force.
  • This invention relates to an edge roll device for manufacturing float glass in which the outer peripheral blade on the outer periphery on the front end side and the outer peripheral blade on the outer periphery on the rear end side of the composite barrel head are separated and provided independently.
  • the present invention relates to the edge roll device for manufacturing float glass described above, wherein the rotational speed of the outer peripheral blade on the front end side of the composite barrel head is formed larger than the rotational speed of the outer peripheral blade on the rear end side.
  • the present invention relates to the edge roll apparatus for manufacturing float glass described above, wherein the diameter of the outer peripheral blade on the front end side of the composite barrel head is formed larger than the diameter of the outer peripheral blade on the rear end side.
  • the composite barrel head has a composite structure of a front end side barrel head having an outer peripheral blade and a rear end side barrel head having an outer peripheral blade, and a rear end side rotation shaft to which the rear end side barrel head is attached is hollow.
  • the float glass manufacturing edge roll device according to any one of the above, wherein the rotation shaft of the front end side barrel head extends so as to penetrate the rear end side rotation shaft and the rear end side barrel head.
  • both the front end side barrel head and the rear end side barrel head have a hollow structure including a refrigerant flow path therein, and both the front end side rotary shaft and the rear end side rotary shaft are inside thereof.
  • the refrigerant forward path and the return path have a double structure, and the refrigerant forward path and the return path of the distal end side rotating shaft are connected to the hollow portion of the distal end side barrel head at the distal end portion of the distal end side rotating shaft,
  • the float glass manufacturing edge roll device according to any one of the above, wherein the forward path and the return path of the refrigerant on the end-side rotating shaft are connected to the hollow portion of the rear-end side barrel head at the front end portion of the rear-end side rotating shaft.
  • the tensile force is changed between the outer peripheral blade on the front end side and the outer peripheral blade on the rear end side of the composite barrel head in the movement path of the float bath, and the rear end on the front end side of the composite barrel head.
  • the composite barrel head that can apply a stronger tensile force than the side can apply an outward tensile force to the end of the glass ribbon, and the glass ribbon is stretched using this tensile force to make a thin and uniform glass. Ribbons can be formed.
  • the glass ribbon in the midstream area of the float bath tends to cause a local deformation part called a straw, but by using a composite barrel head for the molten glass in the midstream area, by applying a tensile force, The amount of deformation in the thickness direction can be reduced on the end side, and a thin glass ribbon with no locally deformed portion can be obtained.
  • This glass ribbon there are no desired dimensions such as cracking or chipping.
  • a thin glass plate of 1 mm or less can be obtained.
  • FIG. 1 is a schematic diagram showing the overall configuration of the glass plate manufacturing apparatus according to the first embodiment of the present invention.
  • FIG. 2 is a configuration diagram showing a first embodiment of a composite barrel head applied to a top roll provided in the manufacturing apparatus.
  • FIG. 3 is a partial sectional view of the composite barrel head.
  • FIG. 4 is a transverse cross-sectional view showing a part of a rotating shaft of a composite barrel head provided in the manufacturing apparatus.
  • FIG. 5 is a graph showing the state of viscosity at each float bath length position for an example of molten glass supplied to the production apparatus.
  • FIG. 6 is a cross-sectional view showing a second embodiment of the composite barrel head provided in the manufacturing apparatus.
  • FIG. 1 is a schematic diagram showing the overall configuration of the glass plate manufacturing apparatus according to the first embodiment of the present invention.
  • FIG. 2 is a configuration diagram showing a first embodiment of a composite barrel head applied to a top roll provided in the manufacturing apparatus.
  • FIG. 3 is a partial
  • FIG. 7 is a graph showing the relationship of the width (Gross width) of the glass ribbon formed by the distance between the heads having different peripheral speeds provided in the composite barrel head.
  • FIG. 8 is a graph showing the relationship between the number of installed composite barrel heads and the width of the glass ribbon to be formed.
  • FIG. 9 is a graph showing the relationship between the angle of the composite barrel head and the plate width of the glass ribbon to be formed.
  • FIG. 10 is a schematic plan view showing an example of a float bath provided with a conventional top roll.
  • FIG. 11 is a cross-sectional view showing an example of a state in which a barrel head provided on a conventional top roll is pushed into an end portion of a glass ribbon.
  • FIG. 12 shows the relationship between the end of the molten glass and a conventional barrel head.
  • FIG. 12 (a) is a cross-sectional view showing the end of the glass ribbon
  • FIG. 12 (b) is the barrel at the end of the glass ribbon
  • FIG. 12C is a cross-sectional view showing an example of an S-shaped local deformation portion (straw) formed on the end side of the glass ribbon
  • FIG. 13 is a cross-sectional view showing an example of a T-shaped local deformation portion formed on the end side of the glass ribbon.
  • FIG. 14 is a cross-sectional view showing an example of a locally deformed portion having an S-shaped cross section formed on the end side of the glass ribbon.
  • FIG. 1 shows a schematic configuration of a glass plate manufacturing apparatus according to a first embodiment of the present invention.
  • a glass plate manufacturing apparatus (float bath) 1 according to the present embodiment is a refractory furnace having a substantially rectangular shape in plan view.
  • the bathtub 2 is composed of a refractory bottom structure, side walls, and an upper structure. In FIG. 1, only the bottom structure is illustrated in a plan view.
  • the upper structure side of the bathtub 2 is provided with accessory equipment such as a gas supply pipe such as a non-oxidizing gas and a temperature controller, and the atmosphere of the bathtub 2 can be controlled to a non-oxidizing gas atmosphere.
  • accessory equipment such as a gas supply pipe such as a non-oxidizing gas and a temperature controller, and the atmosphere of the bathtub 2 can be controlled to a non-oxidizing gas atmosphere.
  • the temperature of the space portion can be controlled to a target temperature.
  • an inlet portion 5 for supplying the molten glass G onto the molten metal 3 from the forehearth of the glass melting furnace provided in the previous step is provided on the left end side of the bathtub 2.
  • An outlet 6 is formed at the end of the bathtub 2 opposite to the side where the inlet 5 is provided, and a plurality of transport rolls 7 are arranged outside the outlet 6 to form a slow cooling line 7A.
  • a moving path 8 having a rectangular shape in plan view for forming the molten glass G is defined on the molten metal 3 from the inlet portion 5 to the outlet portion 6.
  • the molten glass G flows from the inlet portion 5 onto the molten metal 3 along the movement path 8, the molten glass G is expanded to the required thickness and width to form a molten glass ribbon 9. It is gradually cooled and moved to the outlet portion 6 side to form a glass ribbon 10 as a band-like final form having a uniform width, and this glass ribbon 10 is discharged from the outlet portion 6 to the slow cooling line 7A side. .
  • the planar shape of the bathtub 2 is formed in a rectangular shape
  • the movement path 8 partitioned on the molten metal 3 in the bathtub 2 is also rectangular, but the plane of the movement path 8 is The shape is not limited to a rectangular shape, and any shape that matches the planar shape of the bathtub 2 is possible.
  • the molten glass G supplied from the inlet portion 5 is stretched in the width direction by the above-described plurality of top rolls 11 to form the above-described molten glass ribbon 9 in the downstream region (the outlet portion 6).
  • the belt-shaped glass ribbon 10 having a predetermined width is finally obtained.
  • 16 top rolls 11 are arranged at predetermined intervals from positions for starting to expand the width of the molten glass G, respectively, at both ends in the width direction of the movement path 8. .
  • These 16 top rolls 11 will be distinguished by attaching symbols A 0 to A 15 for the sake of convenience, and individual arrangements will be described.
  • top stage of top rolls 11A 0 and the first top roll 11A 1 ⁇ fourth top roll 11A 4 is provided with a reference barrel head 18 to be described later roll (rim roll apparatus)
  • the fifth top roll 11A 5 to the tenth top roll 11A 10 serve as a top roll (edge roll device) having a composite barrel head 30 described later
  • the fifteenth top roll 11A 15 is a top roll (edge roll device) provided with a reference barrel head 18 described later.
  • the first-stage top roll 11A 1 to the fourth top roll 11A 4 and the eleventh top roll 11A 11 to the fifteenth top roll 11A 15 are integrated with the rotary shaft 17 and the tip thereof.
  • the reference barrel head 18 shown in FIG. The mechanism for rotationally driving the rotating shaft 17 and the mechanism for moving the rotating shaft 17 are omitted in FIG. 1, but the rotating shaft 17 passes through the side wall of the bathtub 2 and extends substantially horizontally to the outside of the bathtub 2.
  • the rotary drive device and the moving device are provided outside the bathtub 2.
  • a moving device in which a rotary driving device such as a motor is provided on a moving carriage provided movably along a rail member laid outside the position where the bathtub 2 is installed is applied. it can.
  • rotational driving devices and moving devices are the same as top roll driving devices and moving devices provided in a general float bath, and the rotary shaft 17 is, for example, rotationally driven in both ends of the movement path 8 in the width direction. It is arranged to be movable in the width direction of the movement path 8 on the side. In FIG. 1, these rotary drive devices and moving devices are omitted, and only the outline of the distal end side of the rotary shaft 17 and the barrel head attached thereto is shown.
  • the reference barrel head 18 includes a two-row outer peripheral blade 19 on the outer peripheral wall 20 a of the rotary drum 20.
  • Both the rotary shaft 17 and the rotary drum 20 have a hollow structure, and a hollow portion 20b formed in the rotary shaft 17 and the rotary drum 20 communicates with each other.
  • a supply pipe 17b having a cooling water supply path 17a is provided inside the rotary shaft 17, and a cooling water return flow path 17c is formed in a gap between the supply pipe 17b and the inner peripheral wall of the rotary shaft 17. .
  • the cooling water is supplied from the supply path 17a to the hollow portion 20b of the rotary drum 20, and the cooling water is recovered through the return flow path 17c, so that the rotary shaft 17 and the rotary drum 20 are connected from the inside thereof. It is configured to be cooled.
  • the supply path 17a of the supply pipe 17b constitutes the forward path of the cooling water (refrigerant), and the cooling water reaches the return flow path 17c via the hollow portion 20b, so that the return flow path 17c is the return path of the cooling water (refrigerant).
  • you may change suitably the cross-sectional shape of the hollow part 20b so that a water flow may circulate efficiently.
  • the outer peripheral blade 19 of the reference barrel head 18 is continuously formed along the outer peripheral wall 20a of the thin cylindrical rotating drum 20 so that a large number of quadrangular pyramid-shaped cutting edges are in two stages (two rows). Since these outer peripheral blades 19 are formed in the circumferential direction of the rotary drum 20 with the same pitch with each blade edge having the same shape, a two-stage in which one row of outer peripheral blades 19 that make a round of the rotary drum 20 is formed as a whole. It is structured.
  • the end surface wall 20c on the side connected and integrated with the rotating shaft 17 side and the end surface wall 20d on the side separated from the rotating shaft 17 are formed in a flat plate shape.
  • the end face wall 20c may be formed in a tapered shape toward the rotating shaft 17 side.
  • the first top roll 11A 0 to the fourth top roll 11A 4 (that is, the top roll 11A 4 is the fifth when counted from the first top roll 11Ao) is connected to the moving path 8 above the molten metal 3 at the entrance 5
  • the molten glass G that has flowed in from is gradually cooled to increase the viscosity, and is installed in the upstream region where the molten glass ribbon 9 is formed.
  • the tenth top roll 11A 10 is installed in the middle region of the moving path 8, that is, the region where the glass ribbon 9 has a higher viscosity than the upstream region.
  • From the eleventh top roll 11A 11 of the structure to the fifteenth top roll 11A 15 are installed in the downstream area of the moving path 8, that is, in the area where the viscosity of the glass ribbon 9 is higher than the middle flow area. ing.
  • the fifth top roll 11A 5 to the tenth top roll 11A 10 are provided with the composite barrel head 30 having the structure shown in FIG.
  • the composite barrel head 30 shown in FIG. 2 is an example in which the reference barrel head 18 described above has a two-stage composite structure. As shown in FIG. 2, the reference barrel head 18 constitutes the distal end side of the composite barrel head 30.
  • the rotary drum 20 having the outer peripheral blade 19 is attached to the tip of the rotary shaft 17 so that the inside of the rotary drum 20 can be cooled with water.
  • the rear end side barrel head 33 constituting the rear side of the composite barrel head 30 has a rotary drum 35 having an outer peripheral blade 19 having the same structure as that of the reference barrel head 18 attached to the front end portion of the rotary shaft 36 having a multi-tube structure.
  • the rotating shaft 36 has a double tube structure including an inner tube 36a and an outer tube 36b. Further, the rotating shaft 17 of the reference barrel head 18 is inserted into the inner tube 36a. Multi-tube structure.
  • the rotating drum 35 of the rear end side barrel head 33 has a hollow structure like the reference barrel head 18, but the rotating shaft 17 passes through the center portion of the end face wall 20d.
  • the inner tube 36a and the outer tube 36b have a double tube structure, they are formed between the inner tube 36a and the outer tube 36b when the inner tube 36a and the outer tube 36b are viewed in cross section as shown in FIG.
  • the space is divided into two left and right flow paths 36c and 36d by partition members 37 and 38 extending in the diameter direction of the inner tube 36a and the outer tube 36b.
  • the flow paths 36c and 36d formed between the inner pipe 36a and the outer pipe 36b are formed over the entire length of the inner pipe 36a and the outer pipe 36b, and these flow paths 36c and 36d are formed on the distal end side of the rotary shaft 36.
  • the rotary drum 35 communicates with the inside.
  • the flow paths 36c and 36d between the inner pipe 36a and the outer pipe 36b one of them is used as an outgoing path for cooling water, and the other is used as a return path for cooling water.
  • the left flow path 36c is described as a cooling water supply side flow path (outward path)
  • the flow path 36d is described as a cooling water return side flow path (return path).
  • the composite barrel head 30 having the configuration shown in FIG. 2 is configured so that the reference barrel head 18 on the front end side and the rear end side barrel head 33 can be separately driven at a target rotational speed. That is, a rotation drive motor (not shown) to which the rotation shaft 13 of the reference barrel head 18 is connected and a rotation drive motor (not shown) to which the rotation shaft 36 of the rear end side barrel head 33 is connected individually rotate each head. It is supposed to do.
  • a gear device may be combined as necessary so that the number of rotations of one rotation drive motor can be branched and different rotation numbers can be transmitted to the rotation shafts 36 and 17.
  • the composite barrel head 30 shown in FIG. 2 is used by pressing against the end 9a in the width direction of the glass ribbon 9 from above. That is, the rotary shafts 17 and 36 are rotated while pressing the barrel heads 18 and 33 against the upper surface of the glass ribbon 9 with the rotary shafts 36 and 17 being substantially horizontal, and an outward tensile force is applied to the end 9a in the width direction of the glass ribbon 9. Is used to stretch and form the glass ribbon 9.
  • the rotational speed of the outer peripheral blade 19 of the reference barrel head 18 on the front end side is set to be large, and the rotational speed of the outer peripheral blade 19 of the rear end side barrel head 33 is set to be small.
  • the end portion 9a is pressed from above, and a tensile force is applied so as to pull the width direction end portion 9a outward due to the difference in rotational speed between the two.
  • the composite barrel head 30 causes a peripheral speed difference between the outer peripheral blade 19 on the front end side and the outer peripheral blade 19 on the rear end side, and a tensile force toward the outer side with respect to the width direction end portion 9a of the glass ribbon 9. Can be made to work efficiently.
  • the composite barrel head 30 of the present embodiment has a basic structure in which two reference barrel heads 18 are connected to the front and rear, the outer peripheral blade 19 is not limited to two stages, but may be a multistage structure having three or more stages.
  • the relationship between the speed and diameter of the outer peripheral blade 19 of the reference barrel head 18 and the outer peripheral blade 19 of the rear end side barrel head 33 and the contact length with the glass ribbon G will be described below.
  • the top roll is disposed horizontally and inclined in the width direction of the float bath 100.
  • the inclined arrangement with an angle in the width direction of the float bath 1 effectively applies a tensile force when the glass ribbon 9 is pulled outward. Because.
  • the barrel head 105A is densely arranged with an inclination as shown in FIG. 10, the rotation axes of the plurality of top rolls 105 adjacent to each other in the length direction of the float bath 1 interfere with each other. There is a problem that the top rolls 105 cannot be densely arranged without a certain distance in the vertical direction.
  • the composite barrel head 30 has a two-stage structure including the reference barrel head 18 on the front end side and the barrel head 33 on the rear end side as in the present application, the relationship of the following expression (1) is established.
  • tan ⁇ kx (Uin ⁇ Uout) / d / Uave ⁇ L (1) equation (where, ⁇ : inclination angle of the composite barrel head 30 with respect to the width direction of the float bath 1, Uin: inside (tip) Side, reference) Rotational speed of outer peripheral blade of barrel head, Uout: Rotational speed of outer peripheral blade of outer (rear end side) barrel head, Uave: Average speed of outer peripheral blades of inner and outer barrel heads, d: Inner barrel head and outer Distance between barrel head, L: contact length between barrel head outer peripheral blade and glass ribbon, k: coefficient)
  • the composite barrel head 30 can be densely arranged up to an interval of about 500 mm or less. Since the composite barrel head 30 can be densely arranged in this manner, the undulation of the glass ribbon 10 during molding can be improved, which is advantageous for producing a glass ribbon with high flatness.
  • the molten glass G is supplied from the inlet portion 5 to the moving path 8 on the molten metal 3 to be spread and provided in plural.
  • a tensile force is applied to the outer sides in the width direction of the molten glass ribbon 9 to adjust the width and thickness of the glass ribbon 9, and finally A glass ribbon 10 having a width can be obtained.
  • a glass plate can be obtained by cutting this glass ribbon 10 to a target size in a subsequent cutting step of the slow cooling line 7A.
  • the top roll 11A 0 to top roll 11A 4 and the top roll 11A 11 to top roll 11A 15 are provided with the reference barrel head 18, so that the outer peripheral blade 19 having a two-row structure is made of glass.
  • the reference barrel head 18 of each of the top rolls applies a necessary tensile force to the both ends in the width direction of the glass ribbon 9 in the upstream region and the downstream region. be able to.
  • the fifth top roll 11A 5 from the 10 th top roll 11A 10 it is provided with a composite barrel head 30, to the glass ribbon 9 medium basin, acting to strong tensile force than the reference barrel head 18
  • the glass ribbon 9 can be expanded.
  • the outer peripheral blade 19 of the reference barrel head 18 having a high peripheral speed and the outer peripheral blade 19 of the rear end side barrel head 33 having a low peripheral speed are provided. Since a strong tensile force can be applied in the direction in which the width of the glass ribbon 10 is further expanded, it is advantageous when manufacturing a thinner glass ribbon 10 having a higher flatness.
  • the glass ribbon 9 in the upstream region has a low viscosity and it is difficult to apply a strong tensile force from the beginning, so the reference barrel head 18 may be used.
  • the glass ribbon 9 in the downstream region has a high viscosity and is almost in a hard state. Even if it is pressed, the amount of deformation in the thickness direction is small. In view of this point, since the glass ribbon 9 is stretched by applying a strong tensile force to the glass ribbon 9 in the midstream region, it is desirable to provide the composite barrel head 30 in the midstream region.
  • a composite barrel head 30 may be appropriately provided in the part.
  • the number of composite barrel heads 30 provided in the middle stream region is not particularly defined in the present embodiment, and the necessary number can be provided for the glass ribbon 10 having the final thickness of interest.
  • the total number of barrel heads in the middle basin need not be the composite barrel head 30, and some barrel heads may be the composite barrel head 30 and the remaining barrel heads may be the reference barrel head 18. What is necessary is just to install a required number so that the local deformation part called a straw may not be produced in order to shape
  • the total number of barrel heads 18 and 30 provided in the entire region from the upstream region to the downstream region is not limited by the example of the present embodiment, and the number necessary for forming the glass ribbon 10 having a desired thickness. Should be installed.
  • a tensile force can be exerted in a direction that naturally expands the width of the molten glass G outward by pressing the outer peripheral blades 19, 19 having different rotational speeds against the ends of the glass ribbon 9. Therefore, it is advantageous when the glass ribbon 9 is formed thin, and the thin glass ribbon 10 can be manufactured.
  • the molten glass G thinly stretched using the top rolls 11A 1 to 11A 15 is gradually cooled as it moves from the upstream area to the downstream area of the movement path 8 to increase its hardness. It becomes the glass ribbon 10 of a fixed width and thickness, reaches the outlet 6 and is conveyed to the slow cooling line 7A side in the subsequent process.
  • a local deformation portion is not generated in the glass ribbon 10 that has been conventionally transported to the slow cooling line 7A while a local deformation portion called a straw is formed. Therefore, there is no possibility that the glass ribbon 10 breaks in the slow cooling line 7A.
  • a cutting line (not shown) is installed in the subsequent process of the slow cooling line 7A, a glass plate having a desired size is obtained by cutting and folding the glass ribbon 10 after the slow cooling to a required size. be able to. Since the local deformation
  • FIG. 5 shows a state in which a general non-alkali glass molten glass changes in viscosity with decreasing temperature and becomes hard and becomes a glass ribbon.
  • a general non-alkali glass molten glass changes in viscosity with decreasing temperature and becomes hard and becomes a glass ribbon.
  • the logarithm of the viscosity of the glass ribbon 9 corresponds to the region where the viscosity ( ⁇ ) of the glass ribbon 9 is 10 5.29 to 10 6.37 dPa ⁇ s. Yes. Therefore, the fifth top roll 11A 5 to the tenth top roll 11A 10 are arranged in the middle flow area where the viscosity of the glass ribbon 9 is 10 5.29 to 10. 6.37 dPa ⁇ s, and these are combined with the composite barrel.
  • the head 30 is preferable. By using the fifth top roll 11A 5 to the tenth top roll 11A 10 as the composite barrel head 30, the glass ribbon 9 can be made to have a good tensile force so that the glass ribbon 10 becomes thinner and flat. can do.
  • an alkali-free glass having the following composition in the oxide-based mass percentage display can be used.
  • SiO 2 50 to 73%, preferably 50 to 66%
  • Al 2 O 3 10.5 to 24%
  • B 2 O 3 0 to 12%
  • SrO: 0 to 24% BaO: 0 to 13.5%
  • ZrO 2 0 to 5%.
  • an alkali-free glass having the following composition can be used in the oxide-based mass percentage display.
  • SiO 2 58 to 66%
  • Al 2 O 3 15 to 22%
  • B 2 O 3 5 to 12%
  • CaO 0 to 9%
  • SrO 3 to 12.5%
  • BaO 0 to 2%
  • MgO + CaO + SrO + BaO 9 to 18%
  • ZrO 2 0 to 5%.
  • an alkali-free glass having the following composition can be used in the oxide-based mass percentage display.
  • SiO 2 54-73% Al 2 O 3 : 10.5 to 22.5%
  • B 2 O 3 0 to 5.5%
  • CaO 0-9%
  • SrO 0 to 16%
  • BaO 0 to 2.5%
  • FIG. 6 shows a second embodiment of the composite barrel head applied to the glass plate manufacturing apparatus according to the present invention, and the composite barrel head 40 of this second embodiment was provided in the previous embodiment.
  • the reference barrel head has a two-stage front and rear composite structure, and the diameter of the barrel head on the front end side and the diameter of the barrel head on the rear end side are different.
  • the point that the reference barrel head 18 forms the front end side of the composite barrel head 40 is the same as the configuration of the second embodiment.
  • the rotary drum 20 having the outer peripheral blade 19 is attached to the tip of the rotary shaft 17 so that the inside of the rotary drum 20 can be cooled with water.
  • the rear end side barrel head 43 constituting the rear side of the composite barrel head 40 has the same structure as that of the reference barrel head 18 but includes a rotating drum 45 and an outer peripheral blade 49 having a small diameter, and the rotating drum 45 rotates in a multi-tube structure. It is attached to the tip of the shaft 36.
  • the structure of the rotating shaft 36 is the same as in the previous embodiment.
  • the composite barrel head 40 of the present embodiment is formed so that the outer diameter of the outer peripheral blade 49 of the rear end side barrel head 43 on the rear end side is smaller than the outer diameter of the outer peripheral blade 19 of the reference barrel head 18 on the front end side.
  • the tensile force can be applied in the same manner as in the case of applying the tensile force described above. That is, the circumferential lengths of the outer peripheral blade 19 on the front end side and the outer peripheral blade 49 on the rear end side are different depending on the structure of the composite barrel head 40, so that the outer peripheral blade 19 on the front end side is the rear end in the same manner as described above.
  • the edge of the glass ribbon 9 in the width direction is bitten deeper into the glass ribbon 9 than the outer peripheral blade 49 on the side, and a peripheral speed difference is generated between the outer peripheral blade 19 on the front end side and the outer peripheral blade 49 on the rear end side.
  • a tensile force can be applied to the outer side of 9a.
  • the outer peripheral blade 19 on the front end side and the outer peripheral blade 19 on the rear end side are set to the same value, the outer peripheral blade 19 on the front end side and the outer peripheral edge on the rear end side Since the outer diameters of the blades 19 are different, a peripheral speed difference is naturally generated between them, and a desired tensile force can be generated. Also, if the peripheral speed of the outer peripheral blade 19 on the front end side is set faster and the peripheral speed of the outer peripheral blade 19 on the rear end side is set slower, the difference in peripheral speed can be increased, so that the tensile force that can be generated can be increased. There are features. Also in the composite barrel head 40 having the structure shown in FIG.
  • a tensile force is applied in a necessary direction by utilizing the peripheral speed difference similarly to the composite barrel head 40 of the first embodiment, and the width direction of the glass ribbon 9 is
  • the glass ribbon 9 can be molded while applying a necessary tensile force to the end portion 9a.
  • the outer peripheral blade 19 having a larger diameter bites deeper into the glass ribbon 9 than the outer peripheral blade 49 having a smaller diameter, and the peripheral speed difference between the outer peripheral blade 19 and the outer peripheral blade 49 is increased.
  • a strong tensile force can be applied to the width direction end portion 9a of the glass ribbon 9 toward the outside.
  • the molten glass having the viscosity characteristics shown in FIG. 5 is applied to a molding apparatus having 16 barrel heads shown in FIG. 1, and the width is about 90 inches (about 2.28 m) to about 120 inches (about 3.05 m).
  • a glass ribbon having a thickness of 0.3 mm was produced.
  • the reference barrel head of the first to fourth top rolls is inclined in a stepwise manner from 0 ° to 15 °, and a composite of the fifth to tenth top rolls.
  • the tilt angle condition was set such that the tilt angle ⁇ was 0 ° without tilting the barrel head, and the tilt angle ⁇ was 0 ° for the reference barrel heads of the 11th to 13th top rolls.
  • FIG. 2 shows a test for producing glass ribbons using a two-stage reference barrel head for all the 16 top rolls and the fifth to tenth pieces arranged in the middle basin for the 16 top rolls.
  • the other top roll was tested using the reference barrel head to produce a glass ribbon.
  • standard barrel head of the front end side and the rear end side barrel head in a composite barrel head was investigated.
  • a composite barrel head having a 7.5-inch interval between the reference barrel head on the front end side and a rear-end side barrel head and a composite barrel head having the same interval of 10 inches are used, respectively. The test was conducted.
  • FIG. 7 shows the result of computer simulation analyzed by an original solver. From the results shown in FIG. 7, the width of the case where the composite barrel head is used for the top roll in the middle basin is wider than the case where the glass barrel is produced by providing the reference barrel head for all 16 top rolls. It was found that a wide glass ribbon can be produced. From this, a wider glass ribbon 9 can be formed by giving a difference in the number of rotations of the barrel head on the front end side and the rear end side barrel head of the composite barrel head, and applying a force to pull the end of the glass ribbon outward. It has been found that it can be manufactured.
  • the number of composite barrel heads (double T / R number) for the top roll in the middle basin is individually changed to 0 to 7 pairs (in the case of 7 pairs, a total of 14 on the left and right sides are used)
  • the plate width of each glass ribbon obtained when the ribbon 9 was produced was tested.
  • standard barrel head was used for all the top rolls of the position which has not installed the composite barrel head.
  • FIG. 8 shows the result of computer simulation analyzed by an original solver. As shown in FIG. 8, it was found that the plate width of the obtained glass ribbon 9 can be increased as the number of composite barrel heads used is increased.
  • the internal / external peripheral speed ratio of the double T / R is 166%.
  • the 10-inch reference barrel head is used, and the inclination angle ⁇ of the reference barrel head is set to 0 from the first stage to the third top roll. Inclination in steps up to 15 °, and incline to 12-15 ° for the 4th to 8th top roll reference barrel heads, and the 9th to 13th top rolls
  • the inclination angle ⁇ of the reference barrel head was decreased stepwise, and the fourteenth and subsequent top roll barrel heads were formed with an inclination angle ⁇ of 0 °.
  • FIG. 9 shows the result of computer simulation analyzed by an original solver.
  • the A1 line in FIG. 9 indicates the width of the glass ribbon obtained when the reference barrel head is used as the barrel head of all top rolls.
  • the barrel heads of all the top rolls were used as the reference barrel head and the inclination angle ⁇ of all the reference barrel heads was 0 °, the width of the glass ribbon was significantly narrowed as shown by line A2.
  • all zero degrees mean that all T / R angles are 0 degrees.
  • the fifth top roll to the tenth top roll are double composite barrel heads shown in FIG. 2 (the inner (front end) barrel head with respect to the rotation speed of the outer (rear end) barrel head). 9 is set to 140%), and the result of molding the glass ribbon is shown by the A3 line in FIG. Further, the result of forming a glass ribbon with the inclination angle ⁇ of the first to third top rolls set to the inclination angle of the top roll of the A1 line with respect to the condition of the A3 line is shown by the A4 line in FIG. Show.
  • the inclination angle ⁇ after the fourth top roll is set to 50% of the inclination angle of the top roll of the A1 line (except for the top roll having an inclination angle of 0 °).
  • the result of molding the glass ribbon is shown by the A5 line in FIG.
  • the inclination angle ⁇ after the fourth top roll is set to 70% of the inclination angle of the top roll of the A1 line (excluding the top roll having an inclination angle of 0 °).
  • the result of forming the glass ribbon is shown by the A6 line in FIG. From the results shown in FIG.
  • the inclination angle ⁇ is set to the reference barrel by using a top roll having a double composite barrel head (the rotation speed of the inner barrel head is set to 140% with respect to the rotation speed of the outer barrel head). It has been found that a glass ribbon having the same width as the A1 line can be formed even if the head inclination angle ⁇ is reduced to a range of 50% to 70%.
  • the technology of the present invention can be widely applied to apparatuses and methods for producing glass plates used in display glass, optical glass, medical glass, architectural glass, vehicle glass, and other general glass products.
  • G ... Molten glass, 1 ... Manufacturing apparatus (float bath), 2 ... Bath, 3 ... Molten metal, 5 ... Inlet part, 6 ... Outlet part, 7 ... Conveyance roll, 7A ... Slow cooling line, 8 ... Movement path, 9 ... Glass ribbon, 10 ... Glass ribbon, 11 ... Top roll, 11A 0 to 11A 15 ... Top roll (edge roll device), 13 ... Rotating shaft, 13a ... Supply path (outward path), 13b ... Supply pipe, 13c ... Return flow Path (return path), 14 ... composite barrel head, 16 ... rotating drum, 16b ... hollow part, 16e ... planting bolt, 16h ... protective cover, 17 ... rotating shaft, 17a ... supply path (outward path), 17b ...
  • supply pipe 17c ... return flow path (return path), 18 ... reference barrel head, 20 ... rotating drum, 20b ... hollow part, 20h ... protective cover, 20e ... planting bolt, 30, 40 ... composite barrel head, 36 ... rotating shaft, 36a ... inner pipe 36b, outer pipes, 36c, 36d, flow paths.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Glass Compositions (AREA)

Abstract

Le but de la présente invention est de fournir une technique permettant la production d'un ruban de verre par un procédé « float » sans produire de sections de déformations locales appelées paillettes. La présente invention concerne un dispositif et un procédé de production d'une feuille de verre. Selon l'invention, la production d'un ruban de verre, en provoquant une force de traction vers l'extérieur pour agir sur les deux extrémités d'un ruban de verre au moyen d'une pluralité de paires de rouleaux supérieurs, comprend l'utilisation d'une tête de tambour composite qui tourne tout en poussant également les bords de coupe périphériques contre les extrémités dans le sens de la largeur du ruban de verre pour appliquer une force de traction au ruban de verre, et le fait de provoquer une force de traction, appliquée à l'extrémité du ruban de verre par le bord de coupe périphérique de l'extrémité distale de la tête de tambour composite, supérieure à la force de traction appliquée à l'extrémité du ruban de verre par le bord de coupe périphérique de l'extrémité arrière de la tête de tambour composite, façonnant ainsi le ruban de verre tout en appliquant également une force de traction dans la direction dans laquelle le ruban de verre s'étend.
PCT/JP2013/060926 2012-04-17 2013-04-11 Dispositif et procédé de production d'une feuille de verre et dispositif de roulage de bord destiné à la production de verre flotté WO2013157478A1 (fr)

Priority Applications (2)

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CN201380020529.3A CN104245606A (zh) 2012-04-17 2013-04-11 玻璃板的制造装置和制造方法以及浮法玻璃制造用边缘辊装置
KR20147029124A KR20150002677A (ko) 2012-04-17 2013-04-11 유리판의 제조 장치 및 제조 방법과 플로트 유리 제조용 테두리 롤 장치

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JP2016183070A (ja) * 2015-03-26 2016-10-20 旭硝子株式会社 支持ロール、ガラス製造装置、およびガラス製造方法

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US3493359A (en) * 1965-03-11 1970-02-03 Pilkington Brothers Ltd Molten bath with roller for drawing a glass sheet thereover
JPS535327B1 (fr) * 1969-06-30 1978-02-25
JPH04325435A (ja) * 1991-04-26 1992-11-13 Asahi Glass Co Ltd 無アルカリガラス
JPH08277131A (ja) * 1995-04-05 1996-10-22 Asahi Glass Co Ltd フロートガラス製造用縁ロール装置
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US11589922B2 (en) 2016-04-05 2023-02-28 Atlantic Cancer Research Institute Microwave-assisted medical technologies and apparatus therefor

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