WO2014077286A1 - フロート板ガラス製造装置、フロート板ガラス製造方法 - Google Patents
フロート板ガラス製造装置、フロート板ガラス製造方法 Download PDFInfo
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- WO2014077286A1 WO2014077286A1 PCT/JP2013/080707 JP2013080707W WO2014077286A1 WO 2014077286 A1 WO2014077286 A1 WO 2014077286A1 JP 2013080707 W JP2013080707 W JP 2013080707W WO 2014077286 A1 WO2014077286 A1 WO 2014077286A1
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- glass
- glass plate
- float
- powder
- wrinkle
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B25/00—Annealing glass products
- C03B25/04—Annealing glass products in a continuous way
- C03B25/06—Annealing glass products in a continuous way with horizontal displacement of the glass products
- C03B25/08—Annealing glass products in a continuous way with horizontal displacement of the glass products of glass sheets
Definitions
- the present invention relates to a float plate glass manufacturing apparatus and a float plate glass manufacturing method.
- molten glass is continuously supplied to a horizontal bath surface of a bathtub containing molten metal to form a glass ribbon.
- the glass ribbon is pulled up from the molten metal bath outlet and drawn out of the molten metal bath to be formed to a target thickness.
- a buffer layer made of, for example, sodium sulfate or sodium sulfite is formed on the glass surface by introducing sulfur dioxide (SO 2 ) into the slow cooling furnace and reacting the glass component with SO 2 on the high temperature glass surface.
- SO 2 sulfur dioxide
- the method to be used was used.
- non-alkali glass containing almost no alkali metal which is considered to adversely affect circuit formation, is used as a plate glass for liquid crystal displays because of the necessity of forming a circuit of a liquid crystal display element on the surface.
- Patent Document 1 discloses a method of forming a buffer layer made of a wrinkle generation preventive agent on the lower surface of a glass ribbon in contact with the transport roller by charging the wrinkle generation preventive agent.
- the buffer layer is formed on the lower surface of the glass ribbon by charging the wrinkle generation preventing agent, so that the charging for charging the wrinkle generation preventing agent is performed.
- the size of the apparatus is increased.
- foreign substances other than the anti-wrinkle agent around the charging device are charged, and the charged foreign substances are also taken into the buffer layer on the lower surface of the glass ribbon. There was a problem.
- a buffer layer is formed between the glass and the glass transport roller by suppressing the mixing of foreign substances with a smaller apparatus than before, and wrinkles occur in the transported glass.
- An object of the present invention is to provide a float sheet glass manufacturing apparatus capable of preventing the above.
- the present invention provides a float plate glass having a wrinkle generation inhibitor spraying part for blowing a flaw generation inhibitor containing powder to a glass to be transported between glass transport rollers. Providing manufacturing equipment.
- the float glass manufacturing apparatus of the present invention blows an anti-wrinkle agent in the gas with respect to the glass to be conveyed, it is buffered between the glass and the glass conveying roller by a smaller apparatus than before. A layer (an anti-wrinkle agent layer) can be formed, and the generation of wrinkles on the glass to be conveyed can be prevented.
- the soot generation preventing agent is accompanied with gas and sprayed on the glass, it is possible to suppress foreign matters from being mixed into the soot generation preventing agent from outside the system.
- the float sheet glass manufacturing apparatus of the present embodiment has a soot-preventing agent spraying section that sprays soot-preventing agent containing powder along with gas to the glass to be transported between the glass transport rollers. It is a feature.
- FIG. 1 schematically shows a cross-sectional view of a float bath glass manufacturing apparatus in which a glass ribbon is drawn out from a float bath and a float bath and conveyed (slowly cooled).
- a melting furnace for melting the glass raw material a cutting apparatus for cutting the manufactured glass, and the like are provided. You can also.
- molten glass 11 is supplied from the left side and formed into a glass ribbon 13 on a molten metal 12.
- the glass transport roller 14 on the right side in the drawing draws it out of the molten metal bath and transports it in the slow cooling furnace.
- a wrinkle generation prevention agent is accompanied with gas and sprayed on glass.
- a wrinkle generation preventing agent spraying portion (not shown) is provided.
- FIG. 2A shows a perspective view of the wrinkle-preventing agent spraying portion and its associated equipment
- FIG. 2B shows a portion surrounded by a dotted line X in FIG. This is an enlarged view of the configuration seen.
- the wrinkle-preventing agent spraying part is composed of two supply pipes 21 provided on the left and right sides from the central part. As shown in FIG. 2B, a plurality of holes 24 are formed on the upper surface, and one end 25 of the supply pipe is closed. In addition, the other end of the supply pipe 21 (22 in FIG. 2A) is open, and serves as a supply port for a soot generation inhibitor and the like.
- the soot generation inhibitor is supplied together with the gas from the supply port 22 provided at the other end (on the opposite side of the center) of each supply pipe in FIG.
- the soot generation preventing agent accompanied (conveyed) by the gas is ejected from the plurality of holes (nozzles) 24 and supplied to the glass passing through the upper surface thereof.
- a cleaning port 23 is provided at the other end in addition to the supply port 22, but the cleaning port 23 is connected to a gas supply pipe or a suction device for cleaning the inside of the pipe. I can keep it.
- it is preferably closed by a valve or the like.
- the positions of the supply port 22 and the cleaning port 23 may be reversed, and the cleaning port 23 may not be provided.
- the present invention is limited to such a form. Instead, for example, two or more rows of holes may be provided. In the case of arranging in two or more rows, for example, the positions can be the same as the positions of the holes in the adjacent rows, but they can also be arranged in different positions such as staggered. Furthermore, the hole size does not need to be uniform, and holes of different sizes and shapes may be included. However, it is preferable to adjust the positions and sizes of the holes so that the wrinkle generation preventing agent can be uniformly supplied to the glass being conveyed.
- the opening and closing of the hole can be selected so that the range in which the soot generation inhibitor is ejected can be adjusted according to the size (width) of the glass to be conveyed.
- it can be configured such that a plug can be set in the hole, or a hole opening / closing mechanism and a valve can be provided.
- the example comprised by the two supply pipes 21 on the right and left from the center part was given as a wrinkle generation prevention agent spraying part, it is not limited to the form which concerns.
- it can be configured by a single supply pipe, and can also be configured by a supply pipe divided into a plurality (three or more).
- the soot generation inhibitor is ejected from the hole of the supply pipe, one end of the supply pipe is closed so that the inside of the pipe can be easily pressurized, and the soot is prevented from the other end. It is preferable that the mixture of the generation inhibitor and the gas is supplied.
- a suction pipe 26 can be provided.
- the suction pipe 26 can be composed of a single pipe.
- the mixture of the soot generation inhibitor and the gas is supplied to the soot generation inhibitor spraying section.
- interposed by the glass conveyance roller 14 may become high. .
- a load is applied to the glass being transported, and deformation or wrinkles may occur, or the wrinkle generation preventing agent may be scattered around, so that the space in the space sandwiched by the glass transport rollers 14 It is provided for aspirating gas and excess soot generation inhibitor.
- the suction pipe 26 only needs to be configured so as to be able to suck the gas in the space sandwiched between the glass transport rollers 14 and the surplus soot generation inhibitor, and its specific form is particularly limited. It is not something.
- a hole (not shown) is provided around the suction pipe 26, and both ends 27 are used as suction ports so as to suck gas or the like in a space sandwiched between glass transport rollers. It can also be configured.
- the suction pipe may be composed of two pipes, an opening may be provided at the end on the center side, and the other end 27 may be a suction port.
- FIG. 2A shows an example in which one suction pipe is arranged, the number of suction pipes is not particularly limited, and may be two as described above, and more than one. It is good also as a structure divided
- the volume ratio (per unit time) of the suction amount by the suction pipe and the blow-out amount from the supply pipe 21 Is preferably 1.0 or more and 3.0 or less, more preferably 1.0 or more and 2.5 or less, and particularly preferably 1.0 or more and 2.0 or less. preferable. This is because if the amount of suction is less than the above range, the pressure in the space sandwiched between the transport rollers will rise and wrinkles will be generated on the glass being transported, or the wrinkle prevention agent will diffuse around It is because there is a case to do. Further, if the suction amount is too much relative to the blowout amount, it may not be possible to sufficiently supply the anti-wrinkle agent to the glass being conveyed.
- FIG. 3A schematically shows an enlarged cross-sectional view of a portion where a plurality of glass transport rollers 14 are arranged, for example, a portion surrounded by a dotted line A in FIG. ) Schematically shows a configuration viewed from the upper surface side (the side of the glass being conveyed) in FIG.
- the supply pipe 21 constituting the wrinkle generation preventing agent blowing portion is disposed between the glass conveying rollers 14. 2B provided in the above-described supply pipe 21 with respect to the surface of the glass 31 being conveyed on the glass conveyance roller 14 (14A to 14C) on the side facing the glass conveyance roller 14. From the plurality of holes 24, the soot generation inhibitor is blown along with the gas. At this time, the wrinkle generation preventing agent may be supplied not only to the glass being conveyed but also to the glass conveyance roller. By attaching the wrinkle generation preventing agent to the roller surface of the glass transport roller, it is possible to prevent the glass and the glass transport roller from coming into direct contact with each other more reliably, and to suppress the generation of wrinkles on the glass surface.
- the amount of blowout from the supply pipe 21 is not particularly limited, but is attached to the supply pipe disposed between a pair of glass transport rollers, and is 30 NL / (min ⁇ m) or more and 300 NL / (min ⁇ m). ) Or less, preferably 30 NL / (min ⁇ m) or more and 200 NL / (min ⁇ m), more preferably 50 NL / (min ⁇ m) or more and 150 NL / (min ⁇ m) or less. Particularly preferred.
- the unit: NL / (min ⁇ m) means the amount of gas supplied per minute per 1 m width of the glass ribbon.
- the amount of the soot generation inhibitor is preferably 0.003 g / NL to 0.3 g / NL, more preferably 0.005 g / NL to 0.2 g / NL, still more preferably 0.003 g / NL relative to the amount of gas. 01 g / NL to 0.1 g / NL.
- the blowing amount from the supply pipe mentioned here is the range about the supply pipe arrange
- a flaw occurrence prevention agent can be directly supplied with respect to the glass currently conveyed via the supply pipe 21, and mixing of the foreign material to the flaw occurrence prevention agent supplied can be prevented. it can. Moreover, since the soot generation inhibitor is sprayed on the glass accompanied with the gas, the soot generation inhibitor can be supplied uniformly to the glass.
- first wall portions 33A and 33B can be provided between the glass transport rollers 14A and 14B and the bottom surface 32 of the float glass manufacturing apparatus. At this time, it is preferable that at least the glass transport rollers 14A and 14B and the first wall portions 33A and 33B have a gap so as not to disturb the driving of the glass transport roller 14.
- second wall portions 34A and 34B can be provided in the vicinity of both ends of the glass conveying roller (both ends of the float glass manufacturing apparatus).
- a bottom plate (not shown) is provided between the first wall portions 33A and 33B. Can also be provided.
- the wall part may be only one of the above-mentioned wall parts, for example, the example which provided two as the 1st wall part is shown. Only one of the first wall portions (either 33A or 33B) may be used.
- the material of the wall portion and the bottom plate is not particularly limited as long as it has heat resistance that can withstand the installation environment.
- the upper surface side of the glass transport roller 14 is transported by the glass 31 being transported, and the side surfaces are transported by the first wall portion (33A, 33B) and the second wall portion (34A, 34B).
- the bottom portion can be a space surrounded by the bottom panel or bottom plate of the float glass manufacturing apparatus.
- the space sandwiched between the glass transport rollers 14 can be a substantially sealed space, that is, a space in which the movement of a substance between other spaces is suppressed (restricted). For this reason, it becomes possible to reduce the extent to which an anti-wrinkling agent scatters to the surroundings, which is preferable.
- the state in which the soot generation preventing agent stays in the space can be maintained, it becomes possible to more reliably attach the soot generation preventing agent to the glass being conveyed.
- the place where the wrinkle prevention agent spraying part can be installed is not particularly limited, and as described above, it can be installed at any place between the glass transport rollers. be able to.
- the wrinkle-preventing agent spraying part is preferably provided between the glass transport rollers and between the glass transport rollers closest to the float bath.
- glass that does not adversely affect the float bath even if it is sprayed on the glass the amount of splash of the anti-fogging agent on the float bath does not matter
- one wrinkle generation preventing agent spraying portion in the float plate glass manufacturing apparatus, the configuration in which one wrinkle generation preventing agent spraying portion is provided has been described as an example, but the present invention is not limited to such a configuration, and can be provided at a plurality of locations.
- one wrinkle generation preventing agent spraying part can be installed between the glass transport rollers 14 ⁇ / b> A and 14 ⁇ / b> B, and one between the glass transport rollers 14 ⁇ / b> B and 14 ⁇ / b> C.
- the wrinkle-preventing agent may be detached during the conveyance, one place on the upstream side and the downstream side of the line of the float plate glass manufacturing apparatus, or Further, a plurality of locations can be provided.
- the part where the wrinkle-preventing agent spraying part is installed is provided at least in a part where the glass ribbon temperature is in the range of the strain point to the strain point + 100 ° C.
- a wrinkle-preventing agent spraying portion can also be provided at a location where the glass ribbon temperature is lower than the strain point.
- the soot generation-preventing agent contains powder and can contain various additive components such as liquid as long as the effect of the present application is not impaired. For example, in order to improve fluidity adjustment, conveyance (pressure feeding) property, and sprayability, it is possible to mix and blow powder and liquid such as water or a volatile solvent. Further, the wrinkle generation preventing agent does not contain a substance other than the powder, and can be composed of the powder.
- the powder contained in the soot generation inhibitor it is preferable to use a powder that passes the evaluation criteria of the Asahi roller powder evaluation method described later. That is, it is preferable to use a powder having an increase in the number of defects calculated by the Asahi roller powder evaluation method of 10 or less. It is more preferable to use a powder having 5 or fewer defects.
- the Asahi roller powder evaluation method has the following steps, which can be performed in the order shown below. It is preferable that the number of defects calculated in the powder evaluation method including the following steps is 10 or less for the powder contained in the soot generation inhibitor. In particular, the increase in the number of defects is more preferably 5 or less.
- ⁇ Glass plate preparation step of preparing a glass plate counting the number of defects ( ⁇ ) on one side (one main plane).
- a powder to be evaluated on one surface of the glass plate by placing the glass plate on the turntable so that the surface opposite to the one surface of the glass plate (the other surface) is in contact with the turntable.
- Defect number counting step that removes powder from the glass plate surface after the roller pressing step and counts the number of defects.
- ⁇ Defect increase number calculation step of calculating the increase number of defects by subtracting the number of defects counted in the glass plate preparation step from the number of defects counted in the defect number counting step.
- the Asahi roller powder evaluation method can be performed using, for example, an evaluation apparatus schematically shown in FIG.
- a glass plate 42 on which powder 43 to be evaluated is placed on one surface is placed on a turntable 41.
- the glass plate 42 is opposed to the turntable 41 on the other surface opposite to the one surface on which the powder 43 is disposed.
- the number of ridges is counted in advance on one surface of the glass plate 42 on which the powder 43 is arranged.
- the turntable 41 is rotated in the direction of arrow A in the figure, and the outer periphery of the glass plate 42 is rotated in the direction of arrow B while pressing the roller 44 against the glass plate 42 in accordance with the rotation of the turntable 41. To move toward the center of rotation.
- a defect number counting step and a defect increase number calculating step can be performed. Then, based on the increase number of defects calculated in the defect increase number calculation step, it is possible to determine whether or not the powder can be used as a wrinkle generation preventing agent.
- the method for detecting the number of glass plate surface defects ( ⁇ ) in the glass plate preparation step and defect number counting step is not particularly limited, but it is preferably detected by, for example, edge light inspection.
- the size of the defect to be detected is not particularly limited, and all defects within a range that can be detected in the edge light inspection can be detected. For example, it is preferable to detect defects of 20 ⁇ m or more. Moreover, it is more preferable that defects of 10 ⁇ m or more are targeted for detection.
- the roller is preferably moved from the outer peripheral portion of the glass plate toward the center of rotation so that the locus of the contact surface of the roller has a spiral shape.
- Table 1 and FIG. 5 show examples of the results of actual powder evaluation by the Asahi roller powder evaluation method.
- non-alkali glass AN100 manufactured by Asahi Glass
- the thickness of the sample is 1 to 2 mm on the glass plate surface in the glass plate rotation start step.
- the glass plate was rotated at 30 rpm.
- the glass plate rotation start step an example in which the evaluation is performed such that the glass plate and the roller are in direct contact without spraying the powder to be evaluated on the glass plate is shown as no powder. According to this, since the number of defects is 59, it can be confirmed that the powder 1 to 7 has a high effect of suppressing the occurrence of soot.
- the material of the powder contained in the wrinkle prevention agent is not particularly limited, and the powder contained in the wrinkle prevention agent is not wrinkled on the glass when placed between the glass to be transported and the glass transport roller. Any material can be used as long as it can prevent the occurrence of. For this reason, in the above-mentioned Asahi type roller powder evaluation method, a powder having a calculated increase in defects of 10 or less can be preferably used. Specifically, for example, alkali metal or alkaline earth metal sulfate, alkali metal or alkaline earth metal chloride salt, alkali metal or alkaline earth metal carbonate, oxide ceramics, nitride ceramics, and metal One or more powders selected from the group consisting of sulfides can be preferably used.
- the powder contained in the wrinkle-preventing agent has a lower Mohs hardness than the glass to be conveyed.
- the Mohs hardness is preferably 6 or less, more preferably a Mohs hardness of 4 or less, and particularly preferably a Mohs hardness of 2 or less.
- the particle size of the powder contained in the wrinkle generation preventing agent is not particularly limited.
- the average particle size (D 50 ) is preferably 1 ⁇ m or more and 100 ⁇ m or less, and preferably 1 ⁇ m or more and 70 ⁇ m or less. More preferably, it is 1 ⁇ m or more and 50 ⁇ m or less.
- the average particle size means a particle size at an integrated value of 50% in a volume-based particle size distribution obtained by a laser diffraction / scattering method. This is because when the average particle diameter of the wrinkle generation preventing agent is in the above range, the wrinkle generation preventing agent easily adheres uniformly to the surface of the glass to be conveyed, and in particular, generation of wrinkles can be suppressed.
- the glass may be wrinkled when sprayed on the glass or when the glass is transported after being attached.
- the content of foreign substances other than the intended component is preferably less than 1000 ppm, more preferably less than 100 ppm, and particularly preferably less than 10 ppm.
- the anti-wrinkle agent does not contain a foreign substance having a particle size of more than 50 ⁇ m, more preferably no particle having a particle size of more than 20 ⁇ m, and a particle size of more than 10 ⁇ m. It is particularly preferable not to contain it. This is because even if foreign matter is mixed, if the particle size is small, the possibility of generating wrinkles on the glass can be reduced.
- a fluidity promoter can be added as an additive to the above-described substances that can be used as the wrinkle generation inhibitor.
- the fluidity promoter may be any substance that can change or adjust the fluidity of the wrinkle generation preventing agent. Specific examples include carbon fine particles and stearic acid.
- the addition amount of the fluidity promoter is not particularly limited, and the addition amount can be selected and adjusted so as to obtain a desired fluidity.
- carbon fine particles when used as the fluidity promoter, it may be added so as to be 2% or more and 30% or less by mass with respect to the substance (added material) that can be used as the above-described wrinkle generation preventing agent.
- the addition is more preferably 5% to 30%, and particularly preferably 5% to 20%.
- stearic acid when used, it is preferably added so as to be 0.2% or more and 10% or less by mass with respect to the substance (material to be added) that can be used as the above-described wrinkle generation preventing agent.
- the addition is more preferably 5% or more and 3% or less, and particularly preferably 0.7% or more and 2% or less.
- a fluidity promoter does not specifically limit as a method of adding a fluidity promoter.
- it can be performed by a method of stirring and mixing a substance (substance to be added) that can be used as the wrinkle generation preventing agent and a fluidity promoter.
- a solution in which a fluidity promoter is dissolved (dispersed) in a solvent (dispersion medium) may be added by spraying or the like to the substance that can be used as the wrinkle generation preventing agent.
- a gas which accompanies a soot generation prevention agent ie, conveys (pressurizes) a soot formation prevention agent
- various gas can be used, it supplies in a float plate glass manufacturing apparatus. Therefore, it is preferable that the gas does not affect the process in the apparatus for producing a float sheet glass.
- the anti-wrinkle agent When the anti-wrinkle agent is installed near the float bath (for example, the location where the glass ribbon temperature is in the range of strain point to strain point + 100 ° C.), that is, near the float bath, for example, as shown in 14A to 14C in FIG.
- nitrogen As the gas. This is because the float bath is generally maintained in a mixed gas atmosphere of nitrogen and hydrogen so that the molten metal is not oxidized. Therefore, when different gases are supplied in the vicinity of the float bath, the gas is contained in the float bath. This is because it may intrude and adversely affect the atmosphere in the float bath.
- SO 2 gas is supplied to the glass being conveyed, and a buffer layer made of sulfate is provided on the surface thereof.
- the buffer layer formed by contact with SO 2 gas are the very thin layer of several micrometer order or less, it does not affect the flaw inspection apparatus for detecting flaws of a glass surface.
- the portion for supplying the SO 2 gas is not particularly limited, but it takes time until the buffer layer is formed by the reaction of the components in the glass and the SO 2 gas as described above. It is preferable to carry out on the upstream side of the production apparatus. For example, it is preferably performed in a slow cooling furnace, and more preferably performed at or near the float bath outlet side in the slow cooling furnace. Also, when blowing flaw prevention agent in flaw prevention agent spraying part of the present embodiment and, at its front and rear, it may be configured to supply the SO 2 gas.
- a buffer layer (an anti-fogging agent layer) is formed between the glass and the glass transport roller by a smaller apparatus than before, and the transported glass is transported. It is possible to prevent wrinkles from occurring.
- the soot generation preventing agent is accompanied with gas and sprayed on the glass, it is possible to suppress foreign matters from being mixed into the soot generation preventing agent from outside the system.
- the float glass sheet manufacturing method of the present embodiment is characterized in that it has a wrinkle generation preventing agent spraying step in which a wrinkle generation preventing agent is blown along with the gas to the glass to be transferred between the glass transfer rollers.
- Float plate glass can be produced, for example, by a production method having the following steps.
- a melting step of melting a glass raw material into a molten glass Supplying and molding molten glass onto the molten metal in the float bath, forming a glass ribbon,
- a slow cooling step of transporting the glass ribbon by a glass transport roller After the slow cooling process, a transport process for transporting the glass ribbon by a glass transport roller until a cutting process, Cutting process to cut glass ribbon.
- a defoaming process can be added after the melting process, or a process of polishing the end face or the main plane can be added after the cutting process.
- the wrinkle generation preventing agent spraying step is preferably performed, for example, in the slow cooling step and / or the transporting step, and more preferably in the slow cooling step. Further, in the first embodiment, as described above, it is more preferable to perform in the slow cooling step immediately after the molding step or in the vicinity thereof. It is particularly preferable that the wrinkle generation preventing agent blowing process is performed between the glass transport rollers and between the glass transport rollers closest to the float bath. However, in order to prevent an adverse effect on the float bath, it is particularly preferable to carry out on the upstream side (molding process side) of the slow cooling process that does not affect the molding process.
- the wrinkle generation inhibitor spraying process can be performed not only once but also multiple times. Specifically, for example, it can be performed in the slow cooling step and the transport step, or can be performed a plurality of times in the slow cooling step. It can be selected according to the ease of removal of the wrinkle generation inhibitor and the degree of wrinkle generation.
- the wrinkle generation preventing agent spraying step is performed at least when the temperature of the glass ribbon (conveyed glass) is in the range of strain point to strain point + 100 ° C. Furthermore, the wrinkle generation preventing agent spraying step can be performed even when the glass ribbon temperature is below the strain point.
- soot generation inhibitor used in the soot generation inhibitor spraying process and the gas accompanying the soot generation inhibitor will be described.
- the soot generation-preventing agent contains powder and can contain various additive components such as liquid as long as the effect of the present application is not impaired. For example, it is possible to mix and spray powder and water or a liquid such as a volatile solvent in order to improve fluidity adjustment, conveyance (pressure feeding) property and sprayability. Further, the wrinkle generation preventing agent does not contain a substance other than the powder, and can be composed of the powder.
- the material of the powder contained in the wrinkle prevention agent is not particularly limited, and the powder contained in the wrinkle prevention agent is not wrinkled on the glass when placed between the glass to be transported and the glass transport roller. Any material can be used as long as it can prevent the occurrence of. For this reason, the powder which passed the above-mentioned Asahi type
- the Asahi type roller powder evaluation method can be carried out according to the procedure described in the first embodiment, and since the contents thereof are as described above, the description thereof is omitted here.
- the material of the powder contained in the soot generation inhibitor include, for example, alkali metal or alkaline earth metal sulfate, alkali metal or alkaline earth metal chloride salt, alkali metal or alkaline earth metal.
- One or more powders selected from the group consisting of carbonates, oxide ceramics, nitride ceramics, and metal sulfides can be preferably used.
- the powder contained in the wrinkle-preventing agent has a lower Mohs hardness than the glass to be conveyed.
- the Mohs hardness is preferably 6 or less, more preferably a Mohs hardness of 4 or less, and particularly preferably a Mohs hardness of 2 or less.
- the particle size of the powder contained in the wrinkle generation preventing agent is not particularly limited.
- the average particle size (D 50 ) is preferably 1 ⁇ m or more and 100 ⁇ m or less, and preferably 1 ⁇ m or more and 70 ⁇ m or less. More preferably, it is 1 ⁇ m or more and 50 ⁇ m or less.
- the average particle size means a particle size at an integrated value of 50% in a volume-based particle size distribution obtained by a laser diffraction / scattering method.
- the glass may be wrinkled when sprayed on the glass or when the glass is transported after being attached.
- the content of foreign substances other than the target component is preferably less than 1000 ppm, more preferably less than 100 ppm, and particularly preferably less than 10 ppm.
- the anti-wrinkle agent does not contain a foreign substance having a particle size of more than 50 ⁇ m, more preferably no particle having a particle size of more than 20 ⁇ m, and a particle size of more than 10 ⁇ m. It is particularly preferable not to contain it. This is because even if foreign matter is mixed, if the particle size is small, the possibility of generating wrinkles on the glass can be reduced.
- the fluidity promoter may be any substance that can adjust the fluidity to the desired range, and specific examples include carbon fine particles and stearic acid.
- the addition amount of the fluidity promoter is not particularly limited, and can be selected so as to obtain a desired fluidity by each fluidity promoter.
- carbon fine particles when used, it is preferably added so as to be 2% or more and 30% or less by mass with respect to the substance (material to be added) that can be used as the above-described wrinkle generation preventing agent.
- the addition is more preferably 30% or less, and particularly preferably 5% or more and 20% or less.
- stearic acid when used, it is preferably added so as to be 0.2% or more and 10% or less by mass with respect to the substance (material to be added) that can be used as the above-described wrinkle generation preventing agent.
- the addition is more preferably 5% to 3%, and particularly preferably 0.7% to 2%.
- a fluidity promoter does not specifically limit as a method of adding a fluidity promoter.
- it can be carried out by a method of stirring and mixing the substance that can be used as the wrinkle generation preventing agent and the fluidity promoter.
- a solution in which a fluidity promoter is dissolved (dispersed) in a solvent (dispersion medium) may be added by spraying or the like to the substance that can be used as the wrinkle generation preventing agent.
- a gas which accompanies a soot generation prevention agent ie, conveys (pressurizes) a soot formation prevention agent
- various gases can be used, it influences another float plate glass manufacturing process. It is preferable that it does not give.
- air, oxygen, and various inert gases can be preferably used.
- Nitrogen is preferably used as the inert gas from the viewpoint of cost.
- the wrinkle-preventing agent spraying step is performed immediately after the molding step (for example, when the glass ribbon temperature is in the range of strain point to strain point + 100 ° C.), that is, the wrinkle-preventing agent spraying portion is close to the float bath.
- the gas is installed (for example, when installed between the glass transport rollers provided in the vicinity of the float bath as in FIGS. 14A to 14C), it is preferable to use nitrogen as the gas. This is because the float bath is generally maintained in a mixed gas atmosphere of nitrogen and hydrogen so that the molten metal is not oxidized. Therefore, when different gases are supplied in the vicinity of the float bath, the gas is contained in the float bath. This is because it may mix and adversely affect the atmosphere in the float bath.
- a supply step can also be provided.
- SO 2 gas from the glass transport roller side to the glass (glass ribbon) drawn from the float bath, for example, in the case of alkali glass, Na, Ba contained in the glass It produces sulfates with Ca, Mg, K and the like.
- the timing for performing the SO 2 gas supply step is not particularly limited, but it takes time until the buffer layer is formed by the reaction of the components in the glass and the SO 2 gas as described above. It is preferable to carry out at an early stage after the process. Specifically, it is preferably performed in the slow cooling step, and is preferably performed at an earlier stage of the slow cooling step.
- the SO 2 gas supply process may be performed when or before or after the soot generation preventing agent is sprayed.
- a buffer layer (an anti-wrinkle agent layer) is formed between a glass transport roller and glass using a smaller apparatus than before, and is transported. It is possible to prevent wrinkles from occurring. Moreover, since the soot generation inhibitor entrained by the gas is blown against the glass, it is possible to prevent foreign matter from being mixed into the soot generation inhibitor from outside the system.
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Abstract
Description
[第1の実施形態]
本実施形態では本発明のフロート板ガラス製造装置の構成例について説明する。
[第2の実施形態]
本実施形態では本発明のガラスフロート板ガラス製造方法の実施形態例について説明する。
溶融ガラスをフロートバス中の溶融金属上に供給、成形してガラスリボンとする成形工程と、
徐冷炉内において、前記ガラスリボンをガラス搬送ローラーにより搬送する徐冷工程と、
徐冷工程後、ガラスリボンを切断する切断工程までガラス搬送ローラーにより搬送する搬送工程と、
ガラスリボンを切断する切断工程。
Claims (9)
- ガラス搬送ローラー間において、搬送するガラスに対して、粉体を含む疵発生防止剤を気体に同伴させて吹きつける疵発生防止剤吹きつけ部を有するフロート板ガラス製造装置。
- 前記粉体は、以下のステップを含む粉体評価方法において算出される欠点の増加数が10個以下である請求項1に記載のフロート板ガラス製造装置。
一方の面の欠点の数をカウントしたガラス板を準備するガラス板準備ステップ。
前記ガラス板の前記一方の面とは反対側の面が回転台と接するようにして、前記ガラス板を回転台上に載置し、前記ガラス板の前記一方の面上に前記粉体を散布した後、前記ガラス板を回転させるガラス板回転開始ステップ。
前記ガラス板の外周部にローラーを載せ、前記ガラス板の外周部から回転中心方向に移動させるローラー押し当てステップ。
前記ローラー押し当てステップ後の前記ガラス板表面から前記粉体を除去し、欠点の数をカウントする欠点数カウントステップ。
前記欠点数カウントステップでカウントした欠点の数から、前記ガラス板準備ステップでカウントした欠点の数を差し引いて欠点の増加数を算出する欠点数算出ステップ。 - 前記粉体が、アルカリ金属あるいはアルカリ土類金属の硫酸塩、アルカリ金属あるいはアルカリ土類金属の塩化物塩、アルカリ金属あるいはアルカリ土類金属の炭酸塩、酸化物セラミックス、窒化物セラミックス、及び金属硫化物からなる群から選択される1種以上である請求項1または2に記載のフロート板ガラス製造装置。
- 前記疵発生防止剤吹きつけ部が、ガラス搬送ローラー間であって、フロートバスに最も近いガラス搬送ローラー間に設けられる請求項1~3のいずれか一項に記載のフロート板ガラス製造装置。
- ガラス搬送ローラー間において、搬送するガラスに対して、粉体を含む疵発生防止剤を気体に同伴させて吹きつける疵発生防止剤吹きつけ工程を有するフロート板ガラス製造方法。
- 前記粉体は、以下のステップを含む粉体評価方法において算出される欠点の増加数が10個以下である請求項5に記載のフロート板ガラス製造方法。
一方の面の欠点の数をカウントしたガラス板を準備するガラス板準備ステップ。
前記ガラス板の前記一方の面とは反対側の面が回転台と接するようにして、前記ガラス板を回転台上に載置し、前記ガラス板の前記一方の面上に前記粉体を散布した後、前記ガラス板を回転させるガラス板回転開始ステップ。
前記ガラス板の外周部にローラーを載せ、前記ガラス板の外周部から回転中心方向に移動させるローラー押し当てステップ。
前記ローラー押し当てステップ後の前記ガラス板表面から前記粉体を除去し、欠点の数をカウントする欠点数カウントステップ。
前記欠点数カウントステップでカウントした欠点の数から、前記ガラス板準備ステップでカウントした欠点の数を差し引いて欠点の増加数を算出する欠点数算出ステップ。 - 前記粉体が、アルカリ金属あるいはアルカリ土類金属の硫酸塩、アルカリ金属あるいはアルカリ土類金属の塩化物塩、アルカリ金属あるいはアルカリ土類金属の炭酸塩、酸化物セラミックス、窒化物セラミックス、及び金属硫化物からなる群から選択される1種以上である請求項5または6に記載のフロート板ガラス製造方法。
- 前記疵発生防止剤吹きつけ工程を、ガラス搬送ローラー間であって、フロートバスに最も近いガラス搬送ローラー間で行う請求項5~7のいずれか一項に記載のフロート板ガラス製造方法。
- 前記疵発生防止剤吹きつけ工程を、搬送するガラスの温度が、歪点~歪点+100℃の範囲で行う請求項5~8のいずれか一項に記載のフロート板ガラス製造方法。
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CN201380057075.7A CN104837782A (zh) | 2012-11-16 | 2013-11-13 | 浮法平板玻璃制造装置、浮法平板玻璃制造方法 |
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JP (1) | JP2016020282A (ja) |
KR (1) | KR20150087204A (ja) |
CN (1) | CN104837782A (ja) |
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WO2019221084A1 (ja) * | 2018-05-17 | 2019-11-21 | Agc株式会社 | フロートガラス製造装置及びフロートガラス製造方法 |
CN109534661A (zh) * | 2018-12-26 | 2019-03-29 | 中国建材国际工程集团有限公司 | 浮法玻璃so2镀膜装置 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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US5707412A (en) * | 1994-09-30 | 1998-01-13 | Ppg Industries, Inc. | Method of reducing glass sheet marking |
WO2009148139A1 (ja) * | 2008-06-06 | 2009-12-10 | 旭硝子株式会社 | 板ガラスの製造装置及び板ガラスの製造方法 |
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WO2008120535A1 (ja) * | 2007-04-03 | 2008-10-09 | Asahi Glass Company, Limited | 板ガラスの製造方法、板ガラスの緩衝層形成装置及び板ガラスの製造設備 |
CN103221352B (zh) * | 2010-11-18 | 2015-07-29 | 旭硝子株式会社 | 玻璃板的制造装置及玻璃板的制造方法 |
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2012
- 2012-11-16 JP JP2012252517A patent/JP2016020282A/ja active Pending
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2013
- 2013-11-13 CN CN201380057075.7A patent/CN104837782A/zh active Pending
- 2013-11-13 KR KR1020157011432A patent/KR20150087204A/ko not_active Application Discontinuation
- 2013-11-13 WO PCT/JP2013/080707 patent/WO2014077286A1/ja active Application Filing
- 2013-11-15 TW TW102141720A patent/TW201433552A/zh unknown
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5707412A (en) * | 1994-09-30 | 1998-01-13 | Ppg Industries, Inc. | Method of reducing glass sheet marking |
WO2009148139A1 (ja) * | 2008-06-06 | 2009-12-10 | 旭硝子株式会社 | 板ガラスの製造装置及び板ガラスの製造方法 |
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KR20150087204A (ko) | 2015-07-29 |
JP2016020282A (ja) | 2016-02-04 |
CN104837782A (zh) | 2015-08-12 |
TW201433552A (zh) | 2014-09-01 |
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