TW201350448A - Device for molding float glass, and method for producing float glass - Google Patents

Abstract

Provided is a device for molding float glass, equipped with a bath containing molten tin, molten glass supplied continuously onto the molten tin being molded by being flowed over the molten tin. In this device for molding float glass, the top surface of the molten tin includes an exposed section not covered by the molten glass; and a dividing wall is furnished for dividing the space above the exposed section into a plurality of spaces, the dividing wall including a ceiling part defining a space in relation to the exposed section, and a side wall part inserted into the molten tin from above the exposed section, along at least a portion of a side edge of the molten glass.

Description

Floating glass forming device and method for manufacturing floating glass

The present invention relates to a forming apparatus for a floating glass and a method of manufacturing the floating glass.

The float glass forming apparatus includes a bath for absorbing molten tin, and the molten glass continuously supplied to the molten tin flows on the molten tin to form a glass ribbon. The formed glass ribbon is pulled up obliquely from the molten tin and sent to the slow cooling furnace. The slow-cooled glass ribbon in the slow-cooling furnace is cut into a specific size shape by a cutting device to obtain a product, that is, a plate glass.

The space above the molten tin is filled with a reducing gas in order to prevent oxidation of the molten tin. As the reducing gas, a mixed gas containing nitrogen and hydrogen is usually used. The reducing gas system is supplied from a hole in the ceiling which is disposed apart from the molten tin.

The space above the molten tin contains a small amount of tin vapor volatilized from the molten tin and oxygen mixed from the outside. When the tin vapor is oxidized, tin oxide particles are generated, and the tin oxide particles fall to the upper surface of the molten glass, and the quality of the plate glass is impaired.

Therefore, in order to improve the quality of the sheet glass, it is proposed to provide a partition wall that separates the space above the molten tin into a plurality of spaces (see, for example, Patent Document 1). The partition wall is formed along the boundary between the portion of the upper surface of the molten tin covered by the molten glass and the exposed portion not covered by the molten glass. The tin oxide particles generated by the oxidation of the tin vapor volatilized from the exposed portion of the molten tin fall to the exposed portion without falling to the upper surface of the molten glass, so that the quality of the plate glass is improved.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1]: Japanese Patent Laid-Open No. 50-3414

Oxygen mixed into the space above the molten tin from the outside is dissolved in the molten tin. Therefore, the molten tin contains oxygen as an impurity, and if the temperature of the molten tin becomes low, tin oxide particles are precipitated in the molten tin. The side bricks of the bath have a lower temperature than the molten tin, so that tin oxide particles are easily precipitated near the side bricks of the bath. The tin oxide particles are lighter than the molten tin and therefore float on the molten tin. There are cases where tin oxide particles adhere to the lower surface of the molten glass.

The present invention has been made in view of the above problems, and it is an object of the invention to provide a molding apparatus for a floating glass which can obtain a plate glass of good quality.

In order to solve the above problems, the apparatus for forming a floating glass according to an aspect of the present invention includes a bath in which molten tin is accommodated, and molten glass continuously supplied to the molten tin flows on the molten tin, and the above-described The upper surface of the molten tin contains an exposed portion not covered by the molten glass, and is provided with a partition wall separating the space above the exposed portion into a plurality of spaces, the partition wall comprising: a ceiling portion, and the exposed portion And a side wall portion inserted into the molten tin from above the exposed portion along at least a portion of a side edge of the molten glass.

According to the present invention, there is provided a forming apparatus for a floating glass which can obtain a plate glass of good quality.

10‧‧‧glass materials

12‧‧‧ molten glass

14‧‧‧glass ribbon

100‧‧‧Floating glass manufacturing equipment

200‧‧‧melting device

210‧‧‧melting tank

220‧‧‧ burner

300‧‧‧Forming device

310‧‧‧Fused tin

311‧‧‧ exposed part

312‧‧‧Parts covered by molten glass 12

314‧‧‧ tin oxide particles

320‧‧‧ bath

321‧‧‧Metal box

322‧‧‧Bottom brick

323‧‧‧Side brick

324‧‧‧ upper side wall

326‧‧‧ shed

327‧‧‧ Space (space above the exposed part)

328‧‧‧ Space (processing space)

329‧‧‧ remaining space

330‧‧‧ gas supply path

332‧‧‧heater

340‧‧‧ partition wall

340A‧‧‧ partition wall

340B‧‧‧ partition wall

341‧‧‧ Ceiling Department

341A‧‧‧ Ceiling Department

341B‧‧‧ Ceiling Department

342‧‧‧ Sidewall

343‧‧‧ facing wall

344‧‧‧ 盖部

345‧‧‧ 盖部

346‧‧‧Supply tube

347‧‧‧ supply port

348‧‧‧Exhaust pipe

349‧‧‧ openings

350‧‧‧ partition wall

361~368‧‧‧Block

371‧‧‧Antioxidant film

400‧‧‧Slow cooling device

410‧‧‧ Slow cooling furnace

420‧‧‧Transport roller

440‧‧‧heater

510‧‧‧ Lifting roller

H‧‧‧Interval between the ceiling portion 341 and the exposed portion 311

L1‧‧‧ dimensions of the partition wall 340 in the X direction

L2‧‧‧X-direction dimensions of molten tin 310

X‧‧‧ parallel to the direction of flow of the molten glass

Y‧‧‧ parallel to the width direction of the molten glass

Y1‧‧ ‧ dimensions of the partition wall 340 from the side of the side brick 323 protruding in the Y direction

Y2‧‧‧Y direction dimension between side brick 323 and molten glass 310

Z1‧‧ wide area

Z2‧‧‧ intermediate area

Z3‧‧‧ narrow area

Fig. 1 is a cross-sectional view showing the outline of a floating glass manufacturing apparatus according to an embodiment of the present invention; Surface map.

Fig. 2 is a cross-sectional view showing the details of a molding apparatus according to an embodiment.

Fig. 3 is a plan view showing the structure of the lower portion of the molding apparatus of the embodiment.

Figure 4 is a cross-sectional view taken along line IV-IV of Figure 3.

Fig. 5 is a cross-sectional view showing a modification of Fig. 4;

Fig. 6 is a cross-sectional view showing another modification of Fig. 4;

Fig. 7 is a plan view showing a modification of Fig. 3;

Fig. 8 is a cross-sectional view showing still another modification of Fig. 4;

Hereinafter, embodiments for carrying out the invention will be described with reference to the drawings. In the following drawings, the same components or corresponding components will be denoted by the same reference numerals or signs, and the description will be omitted.

Fig. 1 is a cross-sectional view showing the outline of a floating glass manufacturing apparatus according to an embodiment of the present invention.

The floating glass manufacturing apparatus 100 includes a melting apparatus 200 that melts the glass raw material 10 to obtain a molten glass 12, and a molding apparatus 300 that forms the molten glass 12 supplied from the melting apparatus 200 into a strip shape to form a glass ribbon 14 And a slow cooling device 400 that slows down the glass ribbon 14 formed in the forming device 300.

The melting apparatus 200 includes a melting tank 210 that accommodates the molten glass 12, and a burner 220 that forms a flame above the molten glass 12 housed in the melting tank 210. The glass raw material 10 introduced into the melting tank 210 is slowly melted into the molten glass 12 by the radiant heat of the flame formed from the burner 220. The molten glass 12 is continuously supplied from the melting tank 210 to the molding apparatus 300.

The molding apparatus 300 includes a bath 320 that accommodates the molten tin 310. The molding apparatus 300 is formed into a strip shape by flowing the molten glass 12 continuously supplied onto the molten tin 310 on the molten tin 310 in a specific direction, thereby forming the glass ribbon 14. Glass belt 14 is oriented to a specific side The flow side is cooled and pulled from the molten tin 310 in the downstream region of the bath 320. The glass ribbon 14 lifted from the molten tin 310 is transported to the slow cooling device 400 by the lift roller 510.

The slow cooling device 400 slows down the glass ribbon 14 formed in the forming device 300. The slow cooling device 400 includes, for example, a slow cooling furnace 410 having a heat insulating structure, and a plurality of conveying rollers 420 disposed in the slow cooling furnace 410 to convey the glass ribbon 14 in a specific direction. The ambient temperature within the slow cooling furnace 410 is decreasing from the inlet to the outlet of the slow cooling furnace 410. The ambient temperature in the slow cooling furnace 410 is adjusted by a heater 440 or the like provided in the slow cooling furnace 410. The glass ribbon 14 carried out from the exit of the slow cooling furnace 410 is cut into a specific size by a cutter to obtain a sheet glass of the product.

Fig. 2 is a cross-sectional view showing the details of a molding apparatus according to an embodiment. Fig. 3 is a plan view showing the structure of the lower portion of the molding apparatus of the embodiment. In FIG. 3, the X direction is a direction parallel to the flow direction of the molten glass, and the Y direction is a direction parallel to the width direction of the molten glass. The X direction and the Y direction are orthogonal to each other. Figure 4 is a cross-sectional view taken along line IV-IV of Figure 3.

As shown in FIGS. 2 and 4, the molding apparatus 300 includes a bath 320 for accommodating the molten tin 310, an annular upper side wall 324 provided along the outer peripheral edge of the bath 320, and a ceiling covering the upper side opening of the upper side wall 324. 326 and so on. The ceiling 326 is provided with a gas supply path 330 (see FIG. 2) for supplying a reducing gas to a space formed between the ceiling 326 and the molten tin 310 or the molten glass 12 (hereinafter referred to as "the upper space of the molding apparatus 300"). Further, a heater 332 as a heating source is inserted into the gas supply path 330.

The gas supply path 330 supplies a reducing gas to the upper space of the molding apparatus 300 in order to prevent oxidation of the molten tin 310. The reducing gas contains, for example, 1% by volume to 15% by volume of hydrogen and 85% by volume to 99% by volume of nitrogen.

The upper space of the forming apparatus 300 is formed to restrict the atmosphere from the gap between the bricks constituting the upper side wall 324 and the like, thereby forming an air pressure higher than atmospheric pressure. The reducing gas system supplied to the upper space of the forming apparatus 300 is discharged to the outside from the discharge port or the like formed on the upper side wall 324.

The heater 332 is provided in plural in order to adjust the temperature distribution of the molten glass 12, for example, in the flow direction (X direction) and the width direction (Y direction) of the molten glass 12. The output of the heater 332 is controlled in such a manner that the temperature from the upstream side to the downstream molten glass 12 is getting lower and lower. Further, the output of the heater 332 is controlled such that the thickness of the molten glass 12 is uniform in the width direction.

The bath 320 is composed of a box-shaped metal case 321 that is open upward, and a bottom brick 322 and a side wall 323 that are provided in the metal case 321 . The metal case 321 prevents the atmosphere from being mixed into the bathtub 320 from the side or below. The plurality of bottom bricks 322 are two-dimensionally arranged and surrounded by a plurality of side tiles 323 that are annularly arranged.

The upper surface of the molten tin 310 in the bath 320 has a wide region Z1 having a wide width, an intermediate portion Z2 having a gradually narrow width, and a narrow region Z3 having a narrow width, as shown in FIG. When the temperature of the wide region Z1 is in the case of containing alkali glass, it is set to 700 ° C or higher. Further, when the temperature of the wide region Z1 is in the case of an alkali-free glass, it is set to 900 ° C or higher.

As shown in FIGS. 3 and 4, the upper surface of the molten tin 310 in the bath 320 includes an exposed portion 311 not covered with the molten glass 12 and a portion 312 covered with the molten glass 12 (see FIG. 4). The exposed portion 311 is on both sides in the width direction of the molten glass 12 as shown in FIG.

As shown in FIGS. 3 and 4, the molding apparatus 300 further includes partition walls 340 and 350 that partition the upper space 327 of the exposed portion 311 into a plurality of spaces 328 and 329 (see FIG. 4). The partition walls 340 and 350 are disposed so as to be free from the distance from the molten glass 12 so as not to interfere with the flow of the molten glass 12, and are disposed symmetrically with the molten glass 12 interposed therebetween. The partition walls 340 and 350 have substantially the same structure. Therefore, a partition wall 340 will be representatively described below.

The partition wall 340 is, for example, a box shape that is open downward, and covers a portion of the exposed portion 311 of the molten tin 310, as shown in FIG. The partition wall 340 suppresses diffusion of tin vapor volatilized from the exposed portion 311 of the molten tin 310, and reduces generation of tin oxide particles. Separate wall 340 restricts contact between the oxygen mixed with the molten tin 310 from the gap between the bricks constituting the upper side wall 324 and the like, and suppresses an increase in the oxygen concentration in the molten tin 310. Further, the partition wall 340 is inserted into the molten tin 310 from above the molten tin 310, and transfers heat from the heater 332 to the molten tin 310.

The partition wall 340 includes a ceiling portion 341 which forms a space 328 (hereinafter also referred to as "processing space 328") with the exposed portion 311 of the molten tin 310, and a side wall portion 342 which is along the side edge of the molten glass 12. At least a portion is formed. Further, the partition wall 340 includes: a facing wall portion 343 that substantially faces the side wall portion 342; a lid portion 344 that closes an opening portion on the upstream side of the processing space 328; and a lid portion 345 that allows the processing space 328 The opening on the downstream side is closed.

The ceiling portion 341 is disposed at a distance from the ceiling 326 covering the upper opening portion of the upper side wall 324, and extends from the side wall 323 of the bath 320 to the inside of the bathtub 320. The ceiling portion 341 blocks the tin oxide particles 314 dropped from above to suppress contamination of the molten tin 310.

The space 328 formed between the ceiling portion 341 and the exposed portion 311 may be a processing space for purifying the molten tin 310. The details of the purification treatment will be described later, and the treatment of removing impurities such as oxygen in the molten tin 310 is performed. The purification treatment includes treatment of generating an oxygen-containing gas (for example, water vapor or carbon monoxide gas) and tin droplets from the tin oxide vapor volatilized from the molten tin 310, and discharging the oxygen-containing gas to the outside of the processing space 328.

The side wall portion 342 is disposed so as to be free from the distance from the molten glass 12 so as not to interfere with the flow of the molten glass 12 . The side wall portion 342 is inserted into the exposed portion 311 of the upper surface of the molten tin 310 from above. The side wall portion 342 can also exit the bottom brick 322 of the bath 320 to homogenize the molten tin 310 in the bath 320 by convection.

The opposite wall portion 343 is fixed to the concave portion of the side wall 323. The opposing wall portion 343 is inserted into the exposed portion 311 from above. The contact surface of the opposing wall portion 343 with the molten tin 310 and the contact surface of the side wall 323 with the molten tin 310 form a flat surface.

The lid portions 344, 345 are inserted into the exposed portion 311 from above.

However, the molten tin 310 is dissolved with oxygen which is mixed into the upper space of the forming apparatus 300 from the outside. Therefore, the molten tin 310 contains oxygen as an impurity, and when the temperature of the molten tin 310 becomes low, tin oxide particles are precipitated. Since the side wall 323 of the bathtub 320 has a lower temperature than the molten tin 310, the tin oxide particles 314 are easily precipitated in the vicinity of the side wall 323 of the bath 320. The tin oxide particles 314 are lighter than the molten tin 310 and thus float on the molten tin 310.

In the present embodiment, the side wall portion 342 is formed along at least a part of the side edge of the molten glass 12, and is inserted into the exposed portion 311 of the upper surface of the molten tin 310 from above. The side wall portion 342 blocks the tin oxide particles floating on the molten tin 310 and suppresses the sneaking to the lower surface of the molten glass 12. Therefore, the quality of the plate glass becomes better.

A supply port 347 for supplying a reducing gas to the inside from the outside of the processing space 328 is formed in the partition wall 340. A supply pipe 346 is connected to the supply port 347. The reducing gas of the supply pipe 346 includes, for example, hydrogen (H ₂ ) or acetylene gas (C ₂ H ₂ ). Acetylene gas is preferred because it has higher reducing power and stronger purification than hydrogen. In order to prevent the temperature of the processing space 328 from dropping, the reducing gas system of the supply pipe 346 may be for supplying the previously heated high temperature gas to the processing space 328, or may be wound around the supply tube 346. The reducing gas supplied from the supply pipe 346 to the processing space 328 can be discharged to the outside of the forming apparatus 300 from the exhaust pipe 348 (see FIG. 3) connected to the exhaust port through the exhaust port formed in the partition wall 340. The exhaust gas can be performed by the difference in air pressure between the outside of the forming apparatus 300 and the processing space 328, or by using an intake source such as a vacuum pump connected to the exhaust pipe 348. The installation position of the supply port 347 and the exhaust port is not limited to the illustrated position.

The reducing gas of the supply pipe 346 may be a mixed gas containing an inert gas such as nitrogen (N ₂ ). In this case, it is preferable to contain an acetylene gas. The acetylene gas has a higher specific gravity than the hydrogen gas, and has a small difference in specific gravity from the inert gas, so that it is easily spread under the processing space 328 and is suitable for purification of the molten tin 310 below the processing space 328. Further, in order to reduce the cost, the reducing gas of the supply pipe 346 may be the same type of gas as the reducing gas of the gas supply path 330.

The reducing gas (for example, H ₂ ) of the supply pipe 346 reacts with the tin oxide vapor (SnO) volatilized from the molten tin 310 in the processing space 328 to generate tin vapor (Sn) and water vapor (H ₂ O). When the amount of tin vapor in the processing space 328 exceeds the saturated vapor amount, the newly formed tin vapor forms tin droplets and falls onto the molten tin 310 in the bath 320. The volatilization of the tin oxide vapor (SnO) from the molten tin 310 is likely to occur at 700 ° C or higher, and is more remarkable at 800 ° C or higher, and is particularly remarkable at 1000 ° C or higher.

Further, the reducing gas supplied from the supply pipe 346 to the processing space 328 reacts with the oxygen in the molten tin 310 to generate steam. This steam is discharged from the exhaust pipe 348 to the outside of the forming apparatus 300 together with the reducing gas. The air pressure of the processing space 328 can also be set to be higher than the air pressure of the remaining space 329. The inflow of oxygen mixed into the remaining space 329 into the processing space 328 is limited.

The concentration (% by volume) of hydrogen in the reducing gas supplied from the supply pipe 346 to the processing space 328 is preferably higher than the concentration of hydrogen in the reducing gas supplied from the gas supply path 330 to the upper space of the forming device 300 (% by volume) ). The reducing power of the environment of the processing space 328 becomes higher as compared with the case where the supply pipe 346 is not provided. The reducing gas supplied from the supply pipe 346 to the processing space 328 may be substantially composed only of hydrogen gas, and may have a hydrogen gas concentration of 99% by volume or more. The acetylene gas concentration (% by volume) in the reducing gas supplied from the supply pipe 346 to the processing space 328 may be lower than the hydrogen concentration (vol%) in the reducing gas supplied from the gas supply path 330 to the upper space 304 of the forming device 300. ). The reducing power of the environment of the processing space 328 becomes higher as compared with the case where the supply pipe 346 is not provided.

The partition wall 340 may be composed of a plurality of blocks 361 to 368 that are continuously disposed in the flow direction (X direction) of the molten glass 12. Each block 361~368 can be set, so setting up the job is easier.

The partition wall 340 may be formed of carbon (C). Carbon has a reducing ability to produce carbon monoxide gas (CO) in an environment with a low oxygen concentration. For example, carbon reacts with tin oxide vapor (SnO) in the processing space 328 to form tin vapor (Sn) and carbon monoxide gas (CO). If empty When the amount of tin vapor in the space 328 exceeds the saturated vapor amount, the newly formed tin vapor forms tin droplets and falls onto the molten tin 310 in the bath 320. Further, carbon reacts with oxygen in the molten tin 310 to form carbon monoxide gas. The carbon monoxide gas is discharged to the outside of the forming apparatus 300 through the exhaust pipe 348 together with the reducing gas. The reduction reaction using carbon is easy to carry out at 450 ° C or higher.

Since the wettability of the carbon and the molten glass 12 is good, when the molten glass 12 is in contact with the partition wall 340 due to the change in the flow of the molten glass 12, the flow of the molten glass 12 is hardly hindered.

In this manner, (1) to (3) purification treatment for removing oxygen in the molten tin 310 is performed in the processing space 328. (1) Tin vapor and water vapor are generated by reaction of tin oxide vapor (SnO) volatilized from molten tin 310 with a reducing gas, and tin droplets liquefied from tin vapor are returned to molten tin 310, and water vapor is transferred to External discharge. (2) Water vapor is generated by the reaction of oxygen in the molten tin 310 with a reducing gas, and the water vapor is discharged to the outside. (3) Tin vapor and carbon monoxide gas are generated by reaction of tin oxide vapor (SnO) volatilized from molten tin 310 with carbon, and tin droplets liquefied by tin vapor are returned to molten tin 310, and carbon monoxide gas is discharged to the outside. . Further, in the above (1) to (3) purification treatment, at least one of the purification treatments may be performed, and the entire purification treatment may not be performed.

Here, when the side wall portion 342 is not inserted into the molten tin 310 and a gap is formed between the side wall portion 342 and the molten tin 310, the reducing gas is difficult to store in the processing space 328 as compared with the case of the present embodiment. In addition, it is difficult to obtain the effects of the above (1) purification treatment and the above (2) purification treatment effects. Further, the effect of blocking the tin oxide particles floating on the molten tin 310 cannot be obtained. Therefore, in the present embodiment, the side wall portion 342 is inserted into the molten tin 310.

The X-direction dimension L1 (see FIG. 3) of the partition wall 340 is preferably 50% or more, more preferably 70% or more, and still more preferably 90% or more of the X-direction dimension L2 (see FIG. 3) of the molten tin 310. If it is 50% or more, the tin oxide particles floating on the molten tin 310 can be sufficiently obtained. The effect. Further, the dimension L1 of the partition wall 340 in the X direction is 100% or less of the dimension L2 of the molten tin 310 in the X direction.

The average value of the ratio (Y1/Y2) of the Y-direction dimension Y1 of the portion of the partition wall 323 protruding from the side wall 323 and the Y-direction dimension Y2 between the side wall 323 and the molten glass 310 is preferably 1/2 or more. More preferably 7/10 or more. Further, the average value of the above ratio (Y1/Y2) is preferably 9/10 or less.

The partition wall 340 may also be disposed in the wide region Z1 of high temperature. The temperature of the wide region Z1 is usually 700 ° C or more at which the tin oxide vapor (SnO) starts to volatilize, so that a reaction between the oxygen-containing gas (for example, water vapor or carbon monoxide gas) and the tin droplets by the tin oxide vapor is performed.

The interval H (see FIG. 4) between the ceiling portion 341 and the exposed portion 311 is preferably 2 mm to 35 mm, more preferably 5 mm to 25 mm, and still more preferably 5 mm to 10 mm. When the interval H is 2 mm or more, the amount of the reducing gas used for the purification treatment can be sufficiently ensured. Further, when the interval H is 35 mm or less, the ventilation efficiency of the treatment space 328 is good, and the rigidity of the partition wall 340 is good.

If the number of air changes per hour of the processing space 328 is too small, the purification process cannot be sufficiently performed. If the cost is increased if the number is too large, it is preferably 3 to 20 times, more preferably 8 to 10 times. Here, the number of ventilations is calculated from the ratio of the volume (Nm ³ ) in the standard state (1 atm, 25 ° C) of the reducing gas supplied to the processing space 328 to the volume of the processing space 328 over one hour.

The embodiment of the present invention has been described above, but the present invention is not limited to the above-described embodiment, and various modifications and changes can be made without departing from the spirit and scope of the invention.

For example, the partition wall 340 of the above embodiment may be connected to the supply pipe 346 and the exhaust pipe 348, but may not be connected. Even if the supply pipe 346 is not connected, it is possible to at least (1) suppress the diffusion of the tin vapor volatilized from the exposed portion 311 of the molten tin 310, and (2) suppress the oxygen mixed with the molten tin 310 from the gap between the upper side walls 324 and the like. Contact, (3) inhibit molten tin The adhesion of the tin oxide particles generated in 310 to the molten glass. Further, even if the supply pipe 346 and the exhaust pipe 348 are not connected, for example, if the opening portion 349 is formed in the partition wall 340 as shown in FIG. 7, the reducing gas can be separated into the processing space by the partition wall 340. 328 is in communication with the remaining space 329, so that the purification process using the reducing gas in the processing space 328 can be performed. The opening portion 349 may also be disposed in the ceiling portion 341 of the partition wall 340. Further, the position at which the opening portion 349 is to be placed is not limited to the illustrated position. Further, when the partition wall 340 is porous and has gas permeability, the partition wall 340 may not have an opening portion. When the opening 349 is formed in the partition wall 340, when the partition wall 340 is porous and has gas permeability, the opening ratio of the inner wall surface of the partition wall 340 is preferably from 1% to 15%. If the aperture ratio is less than 1%, the exchange of the reducing gas is insufficient. When the aperture ratio is more than 15%, oxygen mixed in from the gap of the upper side wall 324 or the like easily enters into the processing space 328, and the effect of the above (2) cannot be sufficiently obtained.

Further, in order to suppress the burning of the partition wall 340, the partition wall 340 is formed with an oxidation resistant film 371 as shown, for example, in FIG. The oxidation resistant film 371 is formed of a ceramic such as tantalum carbide (SiC). As a method of forming the oxidation resistant film 371, for example, a spray method or the like is used. The oxidation resistant film 371 may also cover the entire surface of the partition wall 340.

Further, the partition wall 340 of the above-described embodiment is formed in a box shape that is opened downward, and is fixed to the side wall 323 by the opposing wall portion 343, or the opposing wall portion 343 is not provided. For example, as shown in FIG. 5, the partition wall 340A may be fixed to the side wall 323 by the ceiling portion 341A. Further, as shown in FIG. 6, the partition wall 340B narrows the gap H (see FIG. 4) between the ceiling portion 341B and the molten tin 310, so that a step is formed in the ceiling portion 341B.

The present application claims the priority of Japanese Patent Application No. 2012-121348, filed on May 28, 2012, to the Japanese Patent Office, and the entire contents of the Japanese Patent Application No. 2012-121348. in.

12‧‧‧ molten glass

300‧‧‧Forming device

310‧‧‧Fused tin

311‧‧‧ exposed part

312‧‧‧Parts covered by molten glass 12

314‧‧‧ tin oxide particles

320‧‧‧ bath

322‧‧‧Bottom brick

323‧‧‧Side brick

324‧‧‧ upper side wall

326‧‧‧ shed

327‧‧‧ Space (space above the exposed part)

328‧‧‧ Space (processing space)

329‧‧‧ remaining space

340‧‧‧ partition wall

341‧‧‧ Ceiling Department

342‧‧‧ Sidewall

343‧‧‧ facing wall

346‧‧‧Supply tube

347‧‧‧ supply port

H‧‧‧Interval between the ceiling portion 341 and the exposed portion 311

Y1‧‧ ‧ dimensions of the partition wall 340 from the side of the side brick 323 protruding in the Y direction

Y2‧‧‧Y direction dimension between side brick 323 and molten glass 310

Claims (8)

A molding apparatus for a floating glass, comprising: a bath that contains molten tin and a molten glass that is continuously supplied onto the molten tin flows on the molten tin, and the surface of the molten tin is not contained above The exposed portion of the molten glass cover is provided with a partition wall separating the space above the exposed portion into a plurality of spaces, the partition wall comprising: a ceiling portion forming a space between the exposed portion and the sidewall portion; At least a part of the side edge of the molten glass is inserted into the molten tin from above the exposed portion. The apparatus for forming a floating glass according to claim 1, wherein the partition wall is connected to a supply pipe for supplying a reducing gas to the inside from a space formed between the ceiling portion and the exposed portion. The apparatus for forming a floating glass according to claim 1 or 2, wherein the partition wall is connected to an exhaust pipe that discharges a gas formed in a space between the ceiling portion and the exposed portion to the outside of the forming device. A forming apparatus for a floating glass according to claim 2, wherein said reducing gas contains hydrogen (H ₂ ). The apparatus for forming a floating glass according to any one of claims 1 to 4, wherein the partition wall is formed of carbon. The apparatus for forming a floating glass according to claim 5, wherein the partition wall is formed with an oxidation resistant film. A forming apparatus for a floating glass according to any one of claims 1 to 6, wherein said partition wall is porous and gas permeable, or has a partition which is to be separated by said partition wall A plurality of openings that communicate with each other are described. A method of producing a floating glass, which is produced by using a forming apparatus for a floating glass according to any one of claims 1 to 7.