JP2018104244A - Glass plate manufacturing method and cooling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a glass plate manufacturing method capable of suppressing excess temperature rise of a cooling object.SOLUTION: There is provided a glass plate manufacturing method for molding a glass ribbon from molten glass. The glass plate manufacturing method has steps of: supplying a cooling agent for absorbing and evaporating heat of the air flowing inside a gas pipe, into the gas pipe used for temperature control at the glass ribbon molding time; and sending the air cooled by the cooling agent, toward a cooling object through the gas pipe.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a glass plate manufacturing method and a cooling device.

  In the method for producing a float plate glass described in Patent Document 1, the molten glass is continuously supplied onto the surface of the molten metal, and float-formed into a strip-like glass ribbon. In this manufacturing method, air is blown toward the outer surface of the bathtub by the air supply fan so that the fluctuation range of the outer surface temperature of the bathtub containing the molten metal is within 4 ° C.

International Publication 2012/060197

  Conventionally, the temperature of the object to be cooled sometimes exceeds the allowable value even when the temperature of the room where the blower is installed becomes too high in summer and the rotational speed of the blower is set to the upper limit.

  The objective of this indication is providing the glass plate manufacturing method which can suppress the excessive temperature rise of a cooling target object.

According to one aspect of the present disclosure,
A glass plate manufacturing method for forming molten glass into a glass ribbon,
Supplying a coolant that absorbs and evaporates the heat of the air flowing through the inside of the gas pipe into the inside of the gas pipe used for temperature control at the time of forming the glass ribbon;
There is provided a glass plate manufacturing method including sending the air cooled by the coolant toward an object to be cooled by the gas pipe.

  According to the glass plate manufacturing method of the present disclosure, it is possible to suppress overheating of the cooling target.

It is sectional drawing of the float glass manufacturing apparatus provided with the cooling device by 1st Embodiment, Comprising: It is sectional drawing along the II line | wire of FIG. It is sectional drawing of the float glass manufacturing apparatus along the II-II line of FIG. It is a figure which shows an example of the coolant supply machine shown in FIG. It is a figure which shows another example of the coolant supply machine shown in FIG. It is sectional drawing of a fusion glass manufacturing apparatus provided with the cooling device by 2nd Embodiment.

  Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the drawings, the same or corresponding components are denoted by the same or corresponding reference numerals, and description thereof is omitted.

[First Embodiment]
(Outline of float glass manufacturing equipment)
FIG. 1 is a cross-sectional view of a float glass manufacturing apparatus including the cooling device according to the first embodiment, and is a cross-sectional view taken along the line II of FIG. 2 is a cross-sectional view of the float glass manufacturing apparatus taken along line II-II in FIG.

  The float glass manufacturing apparatus 10 has a bathtub 11, continuously supplies the molten glass 4 onto the molten metal 2 accommodated in the bathtub 11, and the molten glass 4 is formed into a plate-like glass ribbon on the molten metal 2. 6 Float molded. The glass ribbon 6 is gradually cooled and hardened while flowing in the direction of arrow A on the liquid surface of the molten metal 2. The glass ribbon 6 is pulled up from the molten metal 2 in the downstream area of the bathtub 11 and sent toward the slow cooling furnace. A glass plate is manufactured by cutting the glass ribbon slowly cooled in the slow cooling furnace into a predetermined size.

  The bathtub 11 accommodates the molten metal 2 as shown in FIGS. The molten metal 2 is, for example, molten tin or a molten tin alloy. The bathtub 11 has a metal casing 12 and a plurality of bricks 13 that cover the inside of the metal casing 12. The plurality of bricks 13 are assembled in a box shape and accommodate the molten metal 2 therein.

  The float glass manufacturing apparatus 10 has a cooling device 20 that cools the lower wall portion of the bathtub 11 by blowing air in the arrow B direction toward the lower wall portion of the bathtub 11. Thereby, reaction with the molten metal 2 which enters into the joint between the bricks 13 and the metal casing 12 can be prevented. The lower wall portion of the bathtub 11 is cooled to a temperature below the freezing point at which the molten metal 2 solidifies.

  The cooling device 20 is installed in a space formed under the bathtub 11. The cooling device 20 includes, for example, a gas pipe 30 through which air for cooling the lower wall portion of the bathtub 11 flows, a blower 40 that sends air into the gas pipe 30, and cooling that cools air into the gas pipe 30. And a control device 60 that controls the blower 40 and the coolant supply machine 50. The cooling device 20 is used for temperature control of the lower wall portion of the bathtub 11. The temperature control may be manual control or automatic control.

(Gas pipe)
For example, the gas pipe 30 further branches from each branch pipe 32 as shown in FIG. 2, a main pipe 31 into which air is sent by the blower 40, a plurality of branch pipes 32 that branch from the main pipe 31 as shown in FIG. 1. A plurality of injection pipes 33.

  The main pipe 31 extends in the flow direction of the glass ribbon 6, that is, in the longitudinal direction of the bathtub 11 (left and right direction in FIG. 1). The main pipe 31 may extend from the upstream area of the bathtub 11 to the downstream area of the bathtub 11 when viewed from above the bathtub 11.

  In the present specification, upstream means upstream in the flow direction of the glass ribbon 6, and downstream means downstream in the flow direction of the glass ribbon 6. In addition, although mentioned later in detail, the flow direction of the glass ribbon 6 and the flow direction of the air which flows through the inside of the main pipe 31 are reverse directions.

  The main pipe 31 extends from the upstream area of the bathtub 11 to the downstream area of the bathtub 11 as viewed from above the bathtub 11, but the length of the main pipe 31 may vary. For example, the main pipe 31 may extend from the upstream area of the bathtub 11 to the midstream area of the bathtub 11 when viewed from above the bathtub 11.

  The branch pipe 32 protrudes upward from the main pipe 31. A plurality of branch pipes 32 are provided at intervals in the longitudinal direction of the main pipe 31. The plurality of branch pipes 32 may be arranged at an interval from the upstream area of the bathtub 11 to the downstream area of the bathtub 11 when viewed from above the bathtub 11. The number of branch pipes 32 is not particularly limited.

  The intervals between the branch pipes 32 may be equal intervals or unequal intervals. For example, when the interval between the branch pipes 32 provided below the upstream area of the bathtub 11 is narrower than the interval between the branch pipes 32 provided below the downstream area of the bathtub 11, the lower wall portion of the upstream area of the bathtub 11 is provided. Cools intensively. This is because the molten metal 2 in the upstream region of the bathtub 11 is higher in temperature than the molten metal 2 in the downstream region of the bathtub 11 and has a large temperature difference from the freezing point of the molten metal 2.

  A flow rate adjusting unit 34 may be provided in the middle of each branch pipe 32. The flow rate adjusting unit 34 adjusts the flow rate distribution of air flowing from the main pipe 31 into each branch pipe 32. As the flow rate adjusting unit 34, a damper or a valve is used. The operation of the flow rate adjusting unit 34 may be performed manually or automatically by the control device 60.

  An upper end portion of each branch pipe 32 is branched into a plurality of injection pipes 33. The number of branches may be different for each branch pipe 32. A plurality of injection pipes 33 arranged at intervals in the width direction of the bathtub 11 (left-right direction in FIG. 2) are branched from the same branch pipe 32.

  The injection pipe 33 blows air in the arrow B direction toward the lower wall portion of the bathtub 11. The air absorbs heat from the lower wall portion of the bathtub 11 and is discharged outside.

(Blower)
The blower 40 sends air to the main pipe 31. Air having a flow rate corresponding to the rotational speed of the blower 40 is sent to the main pipe 31, distributed to each branch pipe 32, and blown in the direction of arrow B from the respective injection pipes 33 toward the lower wall portion of the bathtub 11.

  The blower 40 is connected to the end of the main pipe 31. The flow direction of the air flowing inside the main pipe 31 is opposite to the flow direction of the glass ribbon 6. Since the glass ribbon 6 is gradually cooled while flowing, if the flow direction of the glass ribbon 6 and the flow direction of the air flowing inside the main pipe 31 are opposite, the blower 40 is installed in a region where the temperature is relatively low. it can.

  In addition, arrangement | positioning of the air blower 40 may be various. For example, the blower 40 may be provided in the middle of the main pipe 31. Further, the number of blowers 40 may be one or plural.

(Coolant supply machine)
The coolant supply unit 50 supplies a coolant that cools the air flowing inside the gas pipe 30 to the inside of the gas pipe 30. The supply position may be in the middle of the main pipe 31 or between the blower 40 and the branch pipe 32 closest to the blower 40. The air cooled by the coolant can be sent to each branch pipe 32.

  The coolant may be a solid such as solid carbon dioxide, a liquid such as liquid nitrogen, or both a solid and a liquid. Any coolant may be used as long as it absorbs and vaporizes the heat of the air flowing in the gas pipe 30. Vaporization includes sublimation.

  The gas pipe 30 sends the air cooled by the coolant toward the lower wall portion of the bathtub 11 that is an object to be cooled. Thereby, when the temperature of the room in which the blower 40 is installed rises in summer or the like, it is possible to suppress the excessive temperature rise of the lower wall portion of the bathtub 11 while operating the blower 40 at a rotation speed equal to or lower than the upper limit value.

  The coolant vaporized in the gas pipe 30 immediately mixes with the air while flowing in the gas pipe 30 together with the air, and reaches the same temperature as the air. And not only air but the vaporized coolant is sprayed on the lower wall portion of the bathtub 11.

  The coolant supplier 50 may supply at least one of solid carbon dioxide and liquid nitrogen into the gas pipe 30 as a coolant in order to suppress deterioration of the lower wall portion of the bathtub 11. Compared with the case where tap water is supplied to the inside of the gas pipe 30, it is possible to suppress the occurrence of corrosion (such as rust) of the metal casing 12 and the adhesion of foreign matters such as chalk to the metal casing 12.

  FIG. 3 is a diagram illustrating an example of the coolant supply machine illustrated in FIG. 1. A coolant supply machine 50 shown in FIG. 3 supplies solid carbon dioxide into the gas pipe 30. The operation of the coolant supply machine 50 may be performed manually or automatically by the control device 60.

  The coolant supply machine 50 includes, for example, a plurality of buckets 51 that sequentially drop crushed solid carbon dioxide into the gas pipe 30 and a conveyor 52 that conveys the plurality of buckets 51. A screw feeder or the like can be used instead of the bucket conveyor.

  Solid carbon dioxide dropped from the coolant supply machine 50 is introduced into the gas pipe 30 from an introduction pipe 35 provided in the middle of the gas pipe 30, and enters a net cage 36 installed in the gas pipe 30. Stored. The solid carbon dioxide stored inside the net cage 36 absorbs the heat of the air flowing inside the gas pipe 30 and vaporizes.

  FIG. 4 is a diagram illustrating another example of the coolant supply machine illustrated in FIG. 1. A coolant supply machine 50 shown in FIG. 4 supplies liquid nitrogen into the gas pipe 30. The operation of the coolant supply machine 50 may be performed manually or automatically by the control device 60.

  The coolant supply unit 50 includes, for example, a tank 53 that stores liquid nitrogen, a flow rate adjustment valve 54 that adjusts the flow rate of liquid nitrogen that flows out of the tank 53, and liquid nitrogen that has passed through the flow rate adjustment valve 54. And a spray nozzle 55 that sprays in a mist toward the inside. The spray nozzle 55 sprays liquid nitrogen in a mist shape using, for example, gravity. Since the specific surface area of liquid nitrogen increases, liquid nitrogen can easily absorb the heat of air, and air can be efficiently cooled.

(Control device)
As illustrated in FIG. 1, the control device 60 includes a CPU (Central Processing Unit) 61, a storage medium 62 such as a memory, an input interface 63, and an output interface 64. The control device 60 performs various controls by causing the CPU 61 to execute a program stored in the storage medium 62. Further, the control device 60 receives a signal from the outside through the input interface 63 and transmits a signal through the output interface 64 to the outside.

  The control device 60 may further include a bathtub temperature detector 65 that detects the temperature of the lower wall portion of the bathtub 11. As the bathtub temperature detector 65, for example, a thermocouple is used. The bathtub temperature detector 65 is provided at intervals in the longitudinal direction of the bathtub 11 and the width direction of the bathtub 11. The number of bathtub temperature detectors 65 may be the same as or different from the number of injection tubes 33.

  The control device 60 may control the rotational speed of the blower 40 so that the deviation between the detected temperature of the bathtub temperature detector 65 and the set temperature becomes zero. The control may be feedback control such as PID control. The control device 60 may have an inverter that converts DC power into AC power and supplies the AC power to the blower 40 so that the rotation speed of the blower 40 can be easily adjusted. By doing so, the temperature fluctuation of the lower wall part of the bathtub 11 can be suppressed.

  The control device 60 may control the supply of the coolant by the coolant supply device 50 based on the rotational speed of the blower 40. The relationship between the rotational speed of the blower 40 and the supply of the coolant is obtained in advance by a test or the like, and what is stored in the storage medium 62 in the form of a formula or a table is read and used.

  For example, when the rotation speed of the blower 40 exceeds the set rotation speed, the control device 60 starts supplying the coolant by the coolant supply machine 50. Moreover, the control apparatus 60 increases the supply amount of the coolant per unit time by the coolant supply unit 50 as the rotational speed of the blower 40 increases. While operating the blower 40 at a rotation speed equal to or lower than the upper limit value, it is possible to suppress an excessive temperature rise in the lower wall portion of the bathtub 11.

  Further, the control device 60 may control the supply of the coolant by the coolant supply device 50 so that the rotation speed of the blower 40 is within a certain range. The flow rate of the gas injected from each injection pipe 33 can be kept constant, and the range of the gas that spreads from each injection pipe 33 against the lower wall portion of the bathtub 11 can be kept constant. If the flow rate of the gas injected from each injection pipe 33 is too small, the range of the gas that spreads from each injection pipe 33 to the lower wall part of the bathtub 11 is too narrow, and if the gas hits the entire lower wall part of the bathtub 11 It will disappear.

  The control device 60 may further include a gas pipe temperature detector 66 that detects the temperature of the air that has passed through the coolant supply position inside the gas pipe 30. As the gas pipe temperature detector 66, for example, a thermocouple is used. The gas pipe temperature detector 66 can detect the temperature of the air cooled by the coolant.

  The control device 60 may control the supply of the coolant by the coolant supply unit 50 based on the detection result of the gas pipe temperature detector 66. For example, the control device 60 controls the supply of the coolant by the coolant supply unit 50 so that the deviation between the detected temperature of the gas pipe temperature detector 66 and the set temperature becomes zero. The control may be feedback control such as PID control. The temperature of the air cooled with the coolant can be maintained within a certain range.

  The control device 60 may further include a room temperature detector 67 that detects the temperature of the room in which the blower 40 is installed. As the room temperature detector 67, for example, a thermocouple is used. The room temperature detector 67 detects the temperature of the air before being cooled with the coolant. For example, when the temperature of a room in which the blower 40 is installed rises and exceeds a set temperature in summer or the like, the control device 60 starts supplying the coolant by the coolant supplier 50. Moreover, the control apparatus 60 increases the supply amount of the coolant per unit time by the coolant supply device 50 as the temperature of the room in which the blower 40 is installed increases. It can respond sensitively to changes in the temperature of the room where the blower 40 is installed.

  In addition, a display device for displaying the detection result of the bathtub temperature detector 65, the detection result of the gas pipe temperature detector 66, the detection result of the room temperature detector 67, and the like may be further provided. The user may manually operate the coolant supply machine 50 while viewing the display on the display device.

(Float glass manufacturing method)
Next, a float glass manufacturing method using the float glass manufacturing apparatus 10 having the above-described configuration will be described with reference to FIGS. 1 and 2 again.

  The float glass manufacturing method includes continuously supplying the molten glass 4 onto the molten metal 2 in the bathtub 11 and float-molding the molten glass 4 onto the plate-like glass ribbon 6 on the molten metal 2. The glass ribbon 6 is gradually cooled and hardened while flowing on the liquid surface of the molten metal 2. The glass ribbon 6 is pulled up from the molten metal 2 in the downstream area of the bathtub 11 and conveyed toward the slow cooling furnace. A glass plate is manufactured by cutting the glass ribbon slowly cooled in the slow cooling furnace into a predetermined size. The manufactured glass plate is used, for example, as a glass substrate for display, a cover glass for display, or a window glass.

  In the float glass manufacturing method, a coolant that absorbs and vaporizes the heat of the air flowing through the gas pipe 30 is supplied to the inside of the gas pipe 30 that is used for forming the glass ribbon 6, and is cooled by the coolant. It has having sending air toward the lower wall part of the bathtub 11 which is a cooling target object by the gas pipe 30. FIG. That is, the float glass manufacturing method includes blowing air cooled by a coolant toward the lower wall portion of the bathtub 11 that houses the molten metal 2 that comes into contact with the glass ribbon 6 formed by the float process. Thereby, when the temperature of the room in which the blower 40 is installed rises in summer or the like, it is possible to suppress the excessive temperature rise of the lower wall portion of the bathtub 11 while operating the blower 40 at a rotation speed equal to or lower than the upper limit value.

  The float glass manufacturing method may include supplying at least one of solid carbon dioxide and liquid nitrogen into the gas pipe 30 as a coolant. The supply may be performed manually or automatically by the control device 60. Compared with the case where tap water is supplied to the inside of the gas pipe 30, it is possible to suppress the occurrence of corrosion (such as rust) of the metal casing 12 and the adhesion of foreign matters such as chalk to the metal casing 12.

  The float glass manufacturing method may include supplying a coolant to the inside of the gas pipe 30 based on the rotational speed of the blower 40 that sends air to the inside of the gas pipe 30. The supply may be performed manually or automatically by the control device 60. While operating the blower 40 at a rotation speed equal to or lower than the upper limit value, it is possible to suppress an excessive temperature rise in the lower wall portion of the bathtub 11. Moreover, the flow volume of the gas injected from each injection pipe 33 can be maintained constant, and the range of the gas that spreads from each injection pipe 33 to the lower wall portion of the bathtub 11 can be maintained constant.

  The float glass manufacturing method may include supplying the coolant into the gas pipe 30 based on the temperature of the air that has passed through the coolant supply position inside the gas pipe 30. The supply may be performed manually or automatically by the control device 60. The temperature of the air cooled with the coolant can be maintained within a certain range.

  The float glass manufacturing method may include supplying a coolant to the inside of the gas pipe 30 based on the temperature of a room in which the blower 40 that sends air to the inside of the gas pipe 30 is provided. The supply may be performed manually or automatically by the control device 60. It can respond sensitively to changes in the temperature of the room where the blower 40 is installed.

The glass plate to be produced may be alkali-free glass when used as a glass substrate for a display. The alkali-free glass is a glass that does not substantially contain an alkali metal oxide such as Na ₂ O, K ₂ O, or Li ₂ O. The alkali-free glass may have a total content of alkali metal oxides of 0.1% by mass or less.

Alkali-free glass, for example, represented by mass% based on _{oxide, SiO 2: 50% ~73%} , Al 2 O 3: 10.5% ~24%, B 2 O 3: 0% ~12%, MgO : 0% to 10%, CaO: 0% to 14.5%, SrO: 0% to 24%, BaO: 0% to 13.5%, MgO + CaO + SrO + BaO: 8% to 29.5%, ZrO ₂ : 0% Contains ~ 5%.

When the alkali-free glass has both a high strain point and high solubility, it is preferably expressed in terms of mass% on the basis of oxide, SiO ₂ : 58% to 66%, Al ₂ O ₃ : 15% to 22%, B ₂ O ₃ : 5% to 12%, MgO: 0% to 8%, CaO: 0% to 9%, SrO: 3% to 12.5%, BaO: 0% to 2%, MgO + CaO + SrO + BaO: 9% to Contains 18%.

When it is desired to obtain a particularly high strain point, the alkali-free glass is preferably expressed by mass% based on oxide, SiO ₂ : 54% to 73%, Al ₂ O ₃ : 10.5% to 22.5%, _{B 2 O 3: 0% ~5.5} %, MgO: 0% ~10%, CaO: 0% ~9%, SrO: 0% ~16%, BaO: 0% ~2.5%, MgO + CaO + SrO + BaO: 8 % To 26%.

  The glass plate to be produced may be chemically strengthened glass when used as a cover glass for a display. What chemically-strengthened the glass for chemical strengthening is used as a cover glass. In the chemical strengthening treatment, ions having a small ion radius (for example, Na ions) among alkali ions contained on the glass surface are replaced with ions having a large ion radius (for example, K ions) to compress the glass surface to a predetermined depth. A stress layer is formed.

Chemically strengthened glass, for example as represented by mol% based on _{oxides, SiO 2: 62% ~68%} , Al 2 O 3: 6% ~12%, MgO: 7% ~13%, Na 2 O: 9% to _17%, K 2 O: containing 0% to 7%, the difference obtained by subtracting the content of _Al 2 _{O 3} from the total content of Na ₂ O and _{K 2} O is less than 10%, a ZrO ₂ When it contains, the content is 0.8% or less.

Another chemically strengthened glass is represented by mol% based on _{oxides, SiO 2: 65% ~85%} , Al 2 O 3: 3% ~15%, Na 2 O: 5% ~15%, K 2 O : 0% to less than 2%, MgO: 0% to 15%, ZrO ₂ : 0% to 1%, the total content of SiO ₂ and Al ₂ O ₃ SiO ₂ + Al ₂ O ₃ is 88% or less It is.

The glass plate produced may be soda lime glass when used as a window glass. Soda lime glass, for example, represented by mass% based on _{oxide, SiO 2: 65% ~75%} , Al 2 O 3: 0% ~3%, CaO: 5% ~15%, MgO: 0% ~15% , Na ₂ O: 10% to 20%, K ₂ O: 0% to 3%, Li ₂ O: 0% to 5%, Fe ₂ O ₃ : 0% to 3%, TiO ₂ : 0% to 5% CeO ₂ : 0% to 3%, BaO: 0% to 5%, SrO: 0% to 5%, B ₂ O ₃ : 0% to 5%, ZnO: 0% to 5%, ZrO ₂ : 0% _{~5%, SnO 2: 0%} ~3%, SO 3: contains 0% to 0.5%.

[Second Embodiment]
FIG. 5 is a cross-sectional view of a fusion glass manufacturing apparatus including a cooling device according to the second embodiment. The fusion glass manufacturing apparatus 10A has a bowl 11A. The molten glass 4A overflowing from the bowl 11A to the left and right sides flows down along the left and right sides of the bowl 11A and joins at the lower end of the bowl 11A, thereby forming a plate-like shape. Fusion molding is performed on the glass ribbon 6A. The glass ribbon 6A is cooled while being sent downward, and is cut into a predetermined size. Thereby, a glass plate is manufactured.

  The fusion glass manufacturing apparatus 10A includes a cooling device 20A that cools the glass ribbon 6A that is sent downward from the basket 11A. The cooling device 20A is used for controlling the temperature distribution of the glass ribbon 6A. The cooling device 20A may be used to control the temperature distribution in the vertical direction of the glass ribbon 6A, or may be used to control the temperature distribution in the width direction of the glass ribbon 6A. The temperature control may be manual control or automatic control.

  The cooling device 20A supplies, for example, a gas pipe 30A through which air for cooling the glass ribbon 6A flows, a blower 40A that sends air into the gas pipe 30A, and a coolant that cools the air into the gas pipe 30A. And a control device 60A for controlling the blower 40A and the coolant supply machine 50A. The cooling device 20A is different from the cooling device 20 of the above-described embodiment in that it has a cooling pipe 70A connected to the gas pipe 30A and an exhaust pipe 80A that exhausts air from the cooling pipe 70A. Hereinafter, the cooling pipe 70A and the exhaust pipe 80A will be mainly described. Since the gas pipe 30A, the blower 40A, the coolant supply machine 50A, and the control device 60A are the same as those in the first embodiment, description thereof is omitted.

  The cooling pipe 70A is provided around the glass ribbon 6A fed downward from the basket 11A. The cooling pipe 70A may have a plurality of U-shaped folded portions or may meander. The air cooled by the coolant inside the gas pipe 30A absorbs the heat of the cooling pipe 70A while flowing through the inside of the cooling pipe 70A, thereby cooling the cooling pipe 70A and eventually cooling the glass ribbon 6A. Thereby, when the temperature of the room in which the blower 40A is installed increases in summer or the like, the excessive temperature rise of the glass ribbon 6A can be suppressed while the blower 40A is operated at a rotation speed equal to or lower than the upper limit value. The air that has absorbed the heat of the cooling pipe 70A passes through the exhaust pipe 80A and is exhausted to the outside.

  As mentioned above, although embodiment of the glass plate manufacturing method etc. were described, this invention is not limited to the said embodiment etc., In the range of the summary of this invention described in the claim, various deformation | transformation and improvement are possible. Is possible.

  For example, the glass plate manufacturing method of the above embodiment is a float method or a fusion method (also called an overflow down draw method), but may be a slit down draw method. In the slit down draw method, a slit is provided at the lower end of the ridge, and a molten glass is drawn from the slit to form a plate-like glass ribbon. In the slit down draw method, a cooling device similar to the fusion method is used.

2 Molten metal 4 Molten glass 6 Glass ribbon 10 Float glass manufacturing apparatus 11 Bath 12 Metal casing 13 Brick 20 Cooling device 30 Gas pipe 31 Main pipe 32 Branch pipe 33 Injection pipe 34 Flow rate adjusting unit 40 Blower 50 Coolant supply machine 60 Control apparatus 4A Molten glass 6A Glass ribbon 10A Fusion glass production apparatus 11A 樋 20A Cooling apparatus 30A Gas pipe 40A Blower 50A Coolant supply machine 60A Control apparatus 70A Cooling pipe 80A Exhaust pipe

Claims (15)

A glass plate manufacturing method for forming molten glass into a glass ribbon,
Supplying a coolant that absorbs and evaporates the heat of the air flowing through the inside of the gas pipe into the inside of the gas pipe used for temperature control at the time of forming the glass ribbon;
The glass plate manufacturing method which has sending the said air cooled with the said coolant toward the cooling target object by the said gas pipe | tube.   The glass plate manufacturing method according to claim 1, comprising supplying at least one of solid carbon dioxide and liquid nitrogen as the coolant into the gas pipe.   The glass plate manufacturing method according to claim 1, further comprising supplying the coolant to the inside of the gas pipe based on a rotation speed of a blower that sends the air to the inside of the gas pipe.   The said coolant is supplied to the inside of the said gas pipe based on the temperature of the said air which passed the supply position of the said coolant inside the said gas pipe. Glass plate manufacturing method.   The glass according to any one of claims 1 to 4, comprising supplying the coolant to the inside of the gas pipe based on a temperature of a room in which a blower for sending the air is provided inside the gas pipe. Plate manufacturing method. The forming of the glass ribbon is a float forming that forms the molten glass into the glass ribbon on a molten metal accommodated in a bathtub,
The glass plate manufacturing method of any one of Claims 1-5 which has spraying the said air cooled with the said coolant toward the lower wall part of the said bathtub which is the said cooling target object. The glass ribbon is molded by forming the glass ribbon into the glass ribbon by flowing down the molten glass overflowing from the side to the left and right sides along the left and right sides of the side and joining at the lower end of the side. Because
The glass plate manufacturing method according to claim 1, comprising sending the air cooled by the coolant to a cooling pipe provided around the glass ribbon that is the cooling target. . A cooling device constituting a device used for forming a glass ribbon,
A gas pipe through which air for cooling an object to be cooled flows;
A blower for sending the air into the gas pipe;
A coolant supply machine that supplies a coolant that absorbs and vaporizes the heat of the air flowing through the gas pipe to the inside of the gas pipe;
The said gas pipe is a cooling device which sends the said air cooled with the said coolant toward the said cooling target object.   The cooling device according to claim 8, wherein the coolant supply unit sends at least one of solid carbon dioxide and liquid nitrogen as the coolant into the gas pipe.   The cooling device according to claim 8 or 9, further comprising a control device that controls the blower and the coolant supply unit.   The said control apparatus is a cooling device of Claim 10 which controls supply of the said coolant by the said coolant supply machine based on the rotation speed of the said air blower.   The said control apparatus controls supply of the said coolant by the said coolant supply machine based on the temperature of the said air which passed the supply position of the said coolant inside the said gas pipe | tube. Cooling system.   The said control apparatus is a cooling device of any one of Claims 10-12 which controls supply of the said coolant by the said coolant supply machine based on the temperature of the room in which the said air blower is installed. The molten glass is molded into the glass ribbon on the molten metal contained in the bathtub, and is used in a float glass manufacturing apparatus,
The said gas pipe | tube has an injection pipe which sprays the said air cooled with the said coolant toward the lower wall part of the said bathtub which is the said cooling target object. Cooling system. It is used in a fusion glass manufacturing apparatus for forming the glass ribbon by flowing the molten glass overflowing from the heel on both the left and right sides along the left and right sides of the heel and joining the lower ends of the heel. There,
The cooling device of any one of Claims 8-13 which has a cooling pipe through which the said air cooled with the said coolant flows around the said glass ribbon which is the said cooling target object.

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