WO2018146908A1 - Glass manufacturing method and method for preheating glass supply tube - Google Patents
Glass manufacturing method and method for preheating glass supply tube Download PDFInfo
- Publication number
- WO2018146908A1 WO2018146908A1 PCT/JP2017/042273 JP2017042273W WO2018146908A1 WO 2018146908 A1 WO2018146908 A1 WO 2018146908A1 JP 2017042273 W JP2017042273 W JP 2017042273W WO 2018146908 A1 WO2018146908 A1 WO 2018146908A1
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- WIPO (PCT)
- Prior art keywords
- glass
- glass supply
- supply pipe
- closing
- preheating
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Classifications
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B7/00—Distributors for the molten glass; Means for taking-off charges of molten glass; Producing the gob, e.g. controlling the gob shape, weight or delivery tact
- C03B7/08—Feeder spouts, e.g. gob feeders
- C03B7/094—Means for heating, cooling or insulation
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B17/00—Forming molten glass by flowing-out, pushing-out, extruding or drawing downwardly or laterally from forming slits or by overflowing over lips
- C03B17/06—Forming glass sheets
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
- C03B5/42—Details of construction of furnace walls, e.g. to prevent corrosion; Use of materials for furnace walls
- C03B5/435—Heating arrangements for furnace walls
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B7/00—Distributors for the molten glass; Means for taking-off charges of molten glass; Producing the gob, e.g. controlling the gob shape, weight or delivery tact
- C03B7/08—Feeder spouts, e.g. gob feeders
- C03B7/094—Means for heating, cooling or insulation
- C03B7/096—Means for heating, cooling or insulation for heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D13/00—Apparatus for preheating charges; Arrangements for preheating charges
Definitions
- the present invention relates to a glass manufacturing method and a glass supply pipe preheating method.
- FPD flat panel displays
- LCDs liquid crystal displays
- OLEDs organic EL displays
- the downdraw method is widely used as a method for producing plate glass.
- this downdraw method an overflow downdraw method or a slot downdraw method is known.
- molten glass is poured into an overflow groove provided on the upper part of a substantially wedge-shaped cross section, and the molten glass overflowing on both sides from the overflow groove is formed along the side wall portions on both sides of the molded body. While flowing down, they are fused and integrated at the lower end of the molded body, and a single sheet of glass is continuously formed.
- a slot-like opening is formed in the bottom wall of a molded body to which molten glass is supplied, and a single sheet glass is continuously formed by flowing the molten glass through the opening. It is.
- the front and back sides of the molded glass sheet are molded without contacting any part of the molded product in the molding process, so the fire-making surface has very good flatness and no defects such as scratches. It becomes.
- a sheet glass manufacturing apparatus using the overflow down draw method As disclosed in Patent Document 1, as a sheet glass manufacturing apparatus using the overflow down draw method, a forming tank having a formed body therein, a slow cooling furnace installed below the forming tank, and cooling provided below the slow cooling furnace Some have a section and a cutting section.
- This plate glass manufacturing apparatus overflows the molten glass from the top of the molded body and forms a plate glass (glass ribbon) by fusing at the lower end thereof, and passes the plate glass through a slow cooling furnace to remove its internal strain. After cooling to room temperature by the cooling unit, the cutting unit is configured to cut to a predetermined size.
- a glass raw material is melted into molten glass in a glass melting tank disposed on the upstream side of the forming tank, and this molten glass is supplied to the downstream forming tank.
- a glass supply path for transferring the molten glass to the forming tank is provided.
- the glass supply path is formed by connecting a plurality of glass supply pipes made of a metal such as platinum.
- the molten glass transported through the glass supply path is at a high temperature of 1600 ° C. or higher, for example.
- the glass supply path is at a low temperature, the molten glass becomes difficult to flow in the supply path and changes in quality. Therefore, it is necessary to heat (preheat) the glass supply path in advance when operating the glass manufacturing apparatus. .
- the connection portion may be deformed and damaged due to expansion of each glass supply tube. For this reason, it is desirable to heat the glass supply path separately for each glass supply tube.
- the glass supply tube is configured in a cylindrical shape, heat loss due to internal heat being radiated to the outside through the opening during heating increases, and preheating cannot be performed efficiently. There was a problem.
- the present invention has been made in view of the above circumstances, and an object of the present invention is to efficiently preheat the glass supply pipe.
- the present invention is for solving the above-mentioned problems, and is formed by connecting a melting step of melting glass raw material to form molten glass, a molding step of molding the molten glass, and a plurality of glass supply pipes. And a glass supply step for transferring the molten glass from a melting step to a molding step through a glass supply path.
- the glass supply tube is energized and heated in a state where the glass supply pipe is separated in advance before the glass supply step.
- a preheating step, and a glass supply path forming step for connecting the glass supply pipe to form the glass supply path after the preheating process, wherein the preheating process includes at least one of the openings of the glass supply pipe.
- a closing step of closing the portion with a closing member is for solving the above-mentioned problems, and is formed by connecting a melting step of melting glass raw material to form molten glass, a molding step of molding the molten glass, and a plurality of glass supply pipes.
- the glass supply pipe is energized and heated in a state where at least a part of the opening of the glass supply pipe is covered with the closing member. Therefore, since heat loss due to heat radiated in the glass supply pipe through the opening can be reduced as much as possible, preheating of the glass supply pipe can be performed efficiently.
- the closing member is preferably made of a flexible heat-resistant member, and may be constituted by a blanket made of heat-resistant fibers, for example. Not only this but the said closure member can be comprised by fire-resistant board members, such as a fire-proof board, for example. This facilitates handling of the closing member in the preheating step.
- the glass supply pipe includes a cylindrical main body portion accommodated in a casing, and a flange portion formed at an end portion of the main body portion.
- the closing member is attached to the flange portion. It is desirable that the opening of the glass supply pipe is closed in contact with the casing and supported by the casing via a fixing member.
- the glass supply pipe can be efficiently heated by covering the main body of the glass supply pipe with the casing and closing the opening of the glass supply pipe with the closing member.
- the opening member can be stably closed by being supported by the casing via the fixing member.
- the preheating step it is desirable to surround the outer peripheral surface of the main body portion of the glass supply pipe with a refractory. According to this, the heat loss by radiation
- the preheating method for the glass supply pipe according to the present invention includes a preheating process for energizing and heating a plurality of glass supply pipes, and a glass supply path forming process for connecting the glass supply pipe to form a glass supply path after the preheating process.
- the preheating step includes a closing step of closing at least a part of the opening of the glass supply pipe with a closing member.
- FIG. 1 to 6 show a first embodiment of a glass manufacturing apparatus and a glass manufacturing method according to the present invention.
- the glass manufacturing apparatus which concerns on this embodiment is the dissolution tank 1, the clarification tank 2, the homogenization tank 3, the state adjustment tank 4, the molding tank 5, and each in order from an upstream side.
- Glass supply paths 6a to 6d for connecting the tanks 1 to 5 are provided.
- the glass manufacturing apparatus may include a slow cooling furnace (not shown) that performs a distortion removing process on the sheet glass GR formed by the forming tank 5 and a cutting device (not shown) that cuts the sheet glass GR after the distortion removing process.
- the melting tank 1 is a container for performing a melting step of melting molten glass raw material and generating molten glass GM.
- the dissolution tank 1 is connected to the clarification tank 2 through the glass supply path 6a.
- the clarification tank 2 is a container for performing a clarification step of defoaming the molten glass GM supplied from the dissolution tank 1 by the action of a clarifier or the like.
- the clarification tank 2 is connected to the homogenization tank 3 through the glass supply path 6b.
- the homogenization tank 3 is a container for performing a homogenization process in which the clarified molten glass GM is stirred with a stirring blade or the like to make it uniform.
- the homogenization tank 3 is connected to the state adjustment tank 4 through the glass supply path 6c.
- the state adjustment tank 4 is a container for performing a state adjustment process for adjusting the molten glass GM to a state suitable for molding.
- the state adjustment tank 4 is connected to the forming tank 5 through a glass supply path 6d.
- the forming tank 5 is a container for forming the molten glass GM into a desired shape.
- the forming tank 5 forms the molten glass GM into a plate shape by the overflow down draw method.
- the forming tank 5 has a substantially wedge-shaped cross section (a cross section perpendicular to the paper surface of FIG. 1), and an overflow groove (not shown) is formed in the upper part of the forming tank 5. Has been.
- the molding tank 5 After the molten glass GM is supplied to the overflow groove by the glass supply path 6d, the molding tank 5 overflows the molten glass GM from the overflow groove, and the side walls on both sides of the forming tank 5 (positioned on the front and back sides of the paper surface). Flow down along the side). The forming tank 5 fuses the molten glass GM that has flowed down at the lower end of the side wall surface, and forms the glass sheet GR.
- the formed sheet glass GR has a thickness of 0.01 to 10 mm, for example, and is used for a flat panel display such as a liquid crystal display or an organic EL display, an organic EL illumination, a substrate such as a solar cell, or a protective cover.
- the forming tank 5 may execute another downdraw method such as a slot downdraw method.
- the glass supply paths 6a to 6d are components for performing a glass supply process for transferring the molten glass GM from the upstream melting tank 1 to the downstream forming tank 5. As shown in FIG. 2, the glass supply paths 6a to 6d are formed by connecting a plurality of glass supply tubes 7. The plurality of glass supply pipes 7 constituting the glass supply paths 6a to 6d are connected to each other through an insulating member 8. The insulating member 8 is configured in an annular shape having an opening at the center.
- the glass supply paths 6a to 6d can be separated for each glass supply pipe 7.
- the glass supply tube 7 is made of platinum or a platinum alloy.
- the glass supply tube 7 is covered with a long casing 9.
- the glass supply tube 7 includes a long main body 10 that transfers the molten glass GM, and energization heating units 11 a and 11 b that are provided at the ends of the main body 10.
- the main body 10 is configured in a cylindrical shape (for example, a cylindrical shape), but is not limited to this shape.
- the main body 10 is configured to be longer than the casing 9. For this reason, each edge part of the main-body part 10 protrudes in the longitudinal direction from the casing 9 and edge part.
- the energization heating units 11 a and 11 b include a first energization heating unit 11 a provided at one end of the main body 10 and a second energization heating unit 11 b provided at the other end of the main body 10.
- Each of the energization heating units 11 a and 11 b includes a flange portion 12 configured to surround the outer peripheral surface at the end of the main body portion 10, and an electrode portion 13 configured integrally with the upper portion of the flange portion 12.
- Each energization heating part 11a, 11b directly energizes and heats the main body part 10 by applying a predetermined voltage to the electrode part 13.
- the flange portion 12 is configured in a disc shape, but is not limited to this shape.
- the electrode portion 13 is a rectangular plate portion protruding upward from the upper portion of the flange portion 12, but is not limited to this shape.
- the cooling part 14 is provided on the surface (outer surface) of the flange part 12.
- the cooling unit 14 is configured by a pipe capable of circulating a cooling medium.
- the cooling part 14 is fixed to the surface of the flange part 12 by welding or other means.
- the cooling unit 14 is made of copper, nickel alloy, or other metal.
- the cooling unit 14 includes a first portion 14 a disposed on the flange portion 12 and a second portion 14 b disposed on the electrode portion 13.
- the first portion 14a is configured in a circular shape so as to follow the edge of the flange portion 12 configured in a disc shape.
- the second portion 14b is configured in a straight line along the longitudinal direction (vertical direction) of the electrode portion 13.
- the second portion 14b includes an inflow portion 14c that supplies a cooling medium to the first portion 14a, and a discharge portion 14d that takes out the cooling medium that has passed through the first portion 14a.
- circulates the cooling part 14 water, air, and various other fluids are used as a cooling medium which distribute
- Casing 9 is formed as a cylindrical body of steel or other metal, but is not limited to this shape.
- the casing 9 accommodates a refractory material (for example, refractory brick) 15 arranged so as to surround the outer peripheral surface of the main body portion 10 of the glass supply pipe 7.
- the inner diameter of the casing 9 is set larger than the outer diameter of the main body 10 in the glass supply pipe 7. Thereby, a space capable of accommodating the refractory 15 is formed between the casing 9 and the main body 10.
- the casing 9 is supported in a building such as a factory in which the glass manufacturing apparatus is arranged so that the position of the casing 9 can be changed by a mount (not shown).
- the clarification process by the clarification tank 2 and the homogenization process by the homogenization tank 3 are sequentially performed on the molten glass GM.
- the state adjustment process by the state adjustment tank 4 is implemented.
- the molten glass GM is transferred to the forming tank 5, and the plate glass GR is formed from the molten glass GM in the forming tank 5 (forming step).
- the molten glass GM is transferred from the melting tank 1 to the forming tank 5 through the glass supply paths 6a to 6d (glass supply process).
- the internal strain of the sheet glass GR is removed by a slow cooling furnace (slow cooling step).
- the plate glass GR is cut into a predetermined dimension (cutting step) or wound into a roll (winding step).
- the preheating step is performed on each glass supply pipe 7 in a state where the glass supply paths 6a to 6d are separated into the glass supply pipes 7 that are constituent elements thereof.
- the preheating step includes a step of closing the opening 7a at the end of the glass supply tube 7 (blocking step) and a step of heating the glass supply tube 7 (heating step).
- the closing member 16 is preferably composed of a member having heat resistance and flexible deformability, such as a blanket made of heat-resistant fibers and fireproof paper.
- the closing member 16 is made of ceramic fibers such as alumina fibers, but is not limited to this structure.
- the closing member 16 may be constituted by a fire-resistant board, fire-resistant brick, or other plate member having heat resistance.
- the shape of the closing member 16 can be a shape corresponding to the shape of the opening 7a, for example, a similar shape of the opening 7a. In the present embodiment, the closing member 16 is formed in a thick sheet shape having a circular main surface.
- the diameter of the closing member 16 is larger than the opening 7 a of the glass supply pipe 7 and smaller than the diameter of the first portion 14 a (circular portion) in the cooling unit 14. Thereby, the closure member 16 contacts the surface (outer surface) of the flange part 12 without contacting the cooling part 14.
- the shape of the closing member 16 is not limited to the above shape, and may be a rectangular shape, an elliptical shape, or the like.
- the closing member 16 is supported by the casing 9 via the fixing member 17.
- the fixing member 17 is composed of a linear member having heat resistance.
- the fixing member 17 is preferably made of a stretchable material so as to expand and contract in accordance with the expansion of the main body 10 and the like. Specifically, for example, a rope formed by twisting ceramic fibers can be used as the fixing member 17.
- the casing 9 has a plurality of (four in the illustrated example) support portions 18 that lock the fixing member 17. Each support portion 18 is a plate portion protruding from the outer peripheral surface of the casing 9, but is not limited to this shape.
- the support portion 18 has a portion (locking portion) 18 a for locking the fixing member 17.
- the fixing member 17 is wound around the closing member 16 in a state where the closing member 16 is brought into contact with the flange portion 12 to close the opening 7 a of the main body portion 10.
- the fixing member 17 fixes the closing member 16 to the flange portion 12 by being locked to the locking portion 18a.
- the process moves to the heating process.
- a voltage is applied to the electrode portion 13 to start heating.
- the main body 10 is heated while circulating the cooling medium through the cooling unit 14 and cooling the energization heating units 11a and 11b.
- the closing member 16 is removed from the glass supply pipe 7 after being heated to a temperature sufficient to transfer the molten glass GM.
- the glass supply pipe 7 from which the closing member 16 has been removed is connected to another glass supply pipe 7. By connecting a plurality of glass supply pipes 7, glass supply paths 6a to 6d are formed (glass supply path forming step).
- the closing member 16 is removed in a state where the openings 7a of the glass supply pipes 7 to be connected face each other in advance, and the glass supply pipes 7 are immediately connected. Is preferred. According to such a connection method, the glass supply paths 6a to 6d can be formed while maintaining the glass supply pipe 7 at a high temperature.
- the glass supply paths 6a to 6d are connected to the corresponding other components 1 to 5 to assemble the glass manufacturing apparatus (assembly process of the glass manufacturing apparatus).
- an energization heating unit is provided at a main point.
- Each of the components 1 to 5 is subjected to a heating process by an energization heating unit at the same time as the preheating of the glass supply pipe 7.
- the inside of the main body 10 is externally closed by closing the opening 7a of the glass supply pipe 7 with the closing member 16 in the preheating step. Shield from. Thereby, the heat loss by the heat
- the closing member 16 is fixed to the flange portion 12 without contacting the cooling portion 14 of each of the energization heating portions 11a and 11b. Therefore, it can prevent that the closure member 16 contacts the cooling part 14, and the said cooling part 14 is heated excessively.
- the closing member 16 is configured in a disc shape, but in the present embodiment, it is configured in a rectangular shape.
- the dimension of the closing member 16 is set to be larger than the diameter of the first portion 14 a in the cooling unit 14. Therefore, the closing member 16 covers the energization heating units 11a and 11b in a wider range than in the first embodiment. This prevents radiation of heat from the opening 7a of the glass supply tube 7 (main body portion 10) and also prevents radiation of heat from the surface of the flange portion 12. Thereby, the preheating of the glass supply pipe 7 can be performed efficiently.
- the closing member 16 is a circular plate member or block material having substantially the same area as the opening area of the opening 7 a of the glass supply tube 7.
- the closing member 16 closes the opening 7 a by being inserted into the opening 7 a of the glass supply pipe 7.
- the fixing member 17 and the support portion 18 of the casing 9 illustrated in the first embodiment are not required.
- this invention is not limited to the structure of the said embodiment, It is not limited to the above-mentioned effect.
- the present invention can be variously modified without departing from the gist of the present invention.
- the present invention is not limited to this.
- Other components in the glass manufacturing apparatus that is, the dissolution tank 1, the clarification tank 2, the homogenization tank 3, the state adjustment tank 4, and the molding tank 5 also have a function of transferring the molten glass GM, It can be regarded as the supply pipe 7.
- the clarification tank 2 is provided with a vent part for discharging gas generated by the defoaming process of the molten glass GM.
- the preheating process can be efficiently carried out by closing the openings of the components that require preheating with the closing member 16.
- the closing member 16 is fixed to the flange portion 12 of the energization heating portions 11a and 11b by the linear fixing member 17 is shown, but this configuration is not limited.
- the closing member 16 may be fixed to the flange portion 12 by a clamp or other fixing means.
- a glass manufacturing method a glass glass and a method of manufacturing a glass roll configured by winding a glass sheet into a roll shape are shown, but the present invention is not limited to this.
- the present invention is applied to a method of manufacturing a glass tube, a glass block and other various glass products.
- the present invention is not limited to this, and a preheating process is performed by closing a part of the opening 7a. Also good. That is, when a part of the opening 7a is closed by the closing member 16, a slight gap may be generated in the opening 7a.
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Abstract
Provided is a glass manufacturing method comprising: a preheating step for, prior to a glass supplying step, electrifying and heating a glass supply tube 7 in advance, in a state where the glass supply tube is separated from glass supply paths 6a-6d; and a glass supply path forming step for, following the preheating step, connecting the glass supply tube 7 to configure the glass supply paths 6a-6d. The preheating step includes a blocking step for blocking at least a portion of openings 7a of the glass supply tube 7 using blocking members 16.
Description
本発明は、ガラス製造方法、及びガラス供給管の予熱方法に関する。
The present invention relates to a glass manufacturing method and a glass supply pipe preheating method.
周知のように、液晶ディスプレイ(LCD)、有機ELディスプレイ(OLED)などのフラットパネルディスプレイ(FPD)用のガラス基板に代表されるように、各種分野に利用される板ガラスには、表面欠陥やうねりに対して厳しい製品品位が要求されるのが実情である。
As is well known, there are surface defects and undulations in plate glass used in various fields, as represented by glass substrates for flat panel displays (FPD) such as liquid crystal displays (LCDs) and organic EL displays (OLEDs). In fact, strict product quality is required.
このような要求を満たすために、板ガラスの製造方法としてダウンドロー法が広く利用されている。このダウンドロー法としては、オーバーフローダウンドロー法やスロットダウンドロー法が公知である。
In order to satisfy such a requirement, the downdraw method is widely used as a method for producing plate glass. As this downdraw method, an overflow downdraw method or a slot downdraw method is known.
オーバーフローダウンドロー法は、断面が略くさび形の成形体の上部に設けられたオーバーフロー溝に溶融ガラスを流し込み、このオーバーフロー溝から両側に溢れ出た溶融ガラスを成形体の両側の側壁部に沿って流下させながら、成形体の下端部で融合一体化し、一枚の板ガラスを連続成形するというものである。また、スロットダウンドロー法は、溶融ガラスが供給される成形体の底壁にスロット状の開口部が形成され、この開口部を通じて溶融ガラスを流下させることにより一枚の板ガラスを連続成形するというものである。
In the overflow down draw method, molten glass is poured into an overflow groove provided on the upper part of a substantially wedge-shaped cross section, and the molten glass overflowing on both sides from the overflow groove is formed along the side wall portions on both sides of the molded body. While flowing down, they are fused and integrated at the lower end of the molded body, and a single sheet of glass is continuously formed. In the slot down draw method, a slot-like opening is formed in the bottom wall of a molded body to which molten glass is supplied, and a single sheet glass is continuously formed by flowing the molten glass through the opening. It is.
特にオーバーフローダウンドロー法では、成形された板ガラスの表裏両面が、成形過程において、成形体の如何なる部位とも接触せずに成形されるので、非常に平面度がよく傷等の欠陥のない火造り面となる。
Especially in the overflow down draw method, the front and back sides of the molded glass sheet are molded without contacting any part of the molded product in the molding process, so the fire-making surface has very good flatness and no defects such as scratches. It becomes.
オーバーフローダウンドロー法を用いる板ガラス製造装置としては、特許文献1に開示されるように、成形体を内部に有する成形槽と、成形槽の下方に設置される徐冷炉と、徐冷炉の下方に設けられる冷却部及び切断部とを備えたものがある。この板ガラス製造装置は、成形体の頂部から溶融ガラスを溢れさせると共に、その下端部で融合させることで板ガラス(ガラスリボン)を成形し、この板ガラスを徐冷炉に通過させてその内部歪みを除去し、冷却部で室温まで冷却した後に、切断部で所定寸法に切断するように構成されている。
As disclosed in Patent Document 1, as a sheet glass manufacturing apparatus using the overflow down draw method, a forming tank having a formed body therein, a slow cooling furnace installed below the forming tank, and cooling provided below the slow cooling furnace Some have a section and a cutting section. This plate glass manufacturing apparatus overflows the molten glass from the top of the molded body and forms a plate glass (glass ribbon) by fusing at the lower end thereof, and passes the plate glass through a slow cooling furnace to remove its internal strain. After cooling to room temperature by the cooling unit, the cutting unit is configured to cut to a predetermined size.
上記の板ガラス製造装置では、成形槽の上流側に配置されるガラス溶解槽において、ガラス原料を溶解させて溶融ガラスとし、この溶融ガラスを下流側の成形槽に供給する。溶解槽と成形槽との間には、溶融ガラスを成形槽に移送するためのガラス供給路が設けられる。このガラス供給路は、例えば白金等の金属により構成される複数のガラス供給管を接続してなる。
In the above plate glass manufacturing apparatus, a glass raw material is melted into molten glass in a glass melting tank disposed on the upstream side of the forming tank, and this molten glass is supplied to the downstream forming tank. Between the melting tank and the forming tank, a glass supply path for transferring the molten glass to the forming tank is provided. The glass supply path is formed by connecting a plurality of glass supply pipes made of a metal such as platinum.
ガラス供給路によって移送される溶融ガラスは、例えば1600℃以上の高温となる。ガラス供給路が低温であると供給路内で溶融ガラスが流動し難くなり、また変質してしまうため、ガラス製造装置の操業にあたり、ガラス供給路を事前に加熱(予熱)しておく必要がある。この場合において、各ガラス供給管を連結した状態で加熱すると、各ガラス供給管の膨張により、その連結部分が変形及び損傷するおそれがある。このため、ガラス供給路の加熱は、ガラス供給管毎に分離して行うことが望ましい。
The molten glass transported through the glass supply path is at a high temperature of 1600 ° C. or higher, for example. When the glass supply path is at a low temperature, the molten glass becomes difficult to flow in the supply path and changes in quality. Therefore, it is necessary to heat (preheat) the glass supply path in advance when operating the glass manufacturing apparatus. . In this case, if each glass supply tube is heated in a connected state, the connection portion may be deformed and damaged due to expansion of each glass supply tube. For this reason, it is desirable to heat the glass supply path separately for each glass supply tube.
この場合において、ガラス供給管は筒状に構成されることから、加熱中に内部の熱がその開口部を通じて外部に放射されることによる熱損失が大きくなり、予熱を効率良く行うことができないという問題があった。
In this case, since the glass supply tube is configured in a cylindrical shape, heat loss due to internal heat being radiated to the outside through the opening during heating increases, and preheating cannot be performed efficiently. There was a problem.
本発明は上記の事情に鑑みて為されたものであり、ガラス供給管の予熱を効率良く行うことを技術的課題とする。
The present invention has been made in view of the above circumstances, and an object of the present invention is to efficiently preheat the glass supply pipe.
本発明は上記の課題を解決するためのものであり、ガラス原料を溶解して溶融ガラスを生成する溶解工程と、前記溶融ガラスを成形する成形工程と、複数のガラス供給管を連結してなるガラス供給路によって前記溶融ガラスを溶解工程から成形工程へと移送するガラス供給工程と、を備えるガラス製造方法において、前記ガラス供給工程の前に、予め前記ガラス供給管を分離した状態で通電加熱する予熱工程と、前記予熱工程後に、前記ガラス供給管を接続して前記ガラス供給路を構成するガラス供給路形成工程と、をさらに備え、前記予熱工程は、前記ガラス供給管の開口部の少なくとも一部を閉塞部材により塞ぐ閉塞工程を備えることを特徴とする。
The present invention is for solving the above-mentioned problems, and is formed by connecting a melting step of melting glass raw material to form molten glass, a molding step of molding the molten glass, and a plurality of glass supply pipes. And a glass supply step for transferring the molten glass from a melting step to a molding step through a glass supply path. The glass supply tube is energized and heated in a state where the glass supply pipe is separated in advance before the glass supply step. A preheating step, and a glass supply path forming step for connecting the glass supply pipe to form the glass supply path after the preheating process, wherein the preheating process includes at least one of the openings of the glass supply pipe. And a closing step of closing the portion with a closing member.
上記のように、予熱工程において、ガラス供給管の開口部の少なくとも一部を閉塞部材によって塞いた状態で当該ガラス供給管を通電加熱する。したがって、開口部を通じてガラス供給管内の熱が放射することによる熱損失を可及的に低減できるため、ガラス供給管の予熱を効率良く実行できる。
As described above, in the preheating step, the glass supply pipe is energized and heated in a state where at least a part of the opening of the glass supply pipe is covered with the closing member. Therefore, since heat loss due to heat radiated in the glass supply pipe through the opening can be reduced as much as possible, preheating of the glass supply pipe can be performed efficiently.
上記のガラス製造方法において、前記閉塞部材は、可撓耐熱性部材から成ることが望ましく、例えば耐熱繊維からなるブランケットにより構成され得る。これに限らず、前記閉塞部材は、例えば、耐火ボード等の耐火性の板部材により構成可能である。これにより、予熱工程における閉塞部材の取り扱いが容易になる。
In the above glass manufacturing method, the closing member is preferably made of a flexible heat-resistant member, and may be constituted by a blanket made of heat-resistant fibers, for example. Not only this but the said closure member can be comprised by fire-resistant board members, such as a fire-proof board, for example. This facilitates handling of the closing member in the preheating step.
また、前記ガラス供給管は、ケーシングに収容される筒状の本体部と、前記本体部の端部に形成されるフランジ部とを備え、前記閉塞工程において、前記閉塞部材は、前記フランジ部に接触した状態で前記ガラス供給管の前記開口部を閉塞するとともに、固定部材を介して前記ケーシングに支持されることが望ましい。
The glass supply pipe includes a cylindrical main body portion accommodated in a casing, and a flange portion formed at an end portion of the main body portion. In the closing step, the closing member is attached to the flange portion. It is desirable that the opening of the glass supply pipe is closed in contact with the casing and supported by the casing via a fixing member.
これによれば、ガラス供給管の本体部をケーシングで覆うとともに、ガラス供給管の開口部を閉塞部材により閉塞することで、ガラス供給管を効率良く加熱できる。しかも、閉塞部材は、固定部材を介してケーシングに支持されることで、開口部を安定的に閉塞できる。
According to this, the glass supply pipe can be efficiently heated by covering the main body of the glass supply pipe with the casing and closing the opening of the glass supply pipe with the closing member. In addition, the opening member can be stably closed by being supported by the casing via the fixing member.
前記予熱工程では、前記ガラス供給管における前記本体部の外周面を耐火物により包囲することが望ましい。これによれば、ガラス供給管における本体部の外周面からの熱の放射による熱損失を低減できる。したがって、ガラス供給管の予熱をより一層効率良く実行できる。
In the preheating step, it is desirable to surround the outer peripheral surface of the main body portion of the glass supply pipe with a refractory. According to this, the heat loss by radiation | emission of the heat | fever from the outer peripheral surface of the main-body part in a glass supply pipe | tube can be reduced. Therefore, preheating of the glass supply pipe can be performed more efficiently.
また、本発明に係るガラス供給管の予熱方法は、複数のガラス供給管を通電加熱する予熱工程と、予熱工程後に、前記ガラス供給管を接続してガラス供給路を構成するガラス供給路形成工程と、を備え、前記予熱工程は、前記ガラス供給管の開口部の少なくとも一部を閉塞部材により塞ぐ閉塞工程を備えることを特徴とする。
In addition, the preheating method for the glass supply pipe according to the present invention includes a preheating process for energizing and heating a plurality of glass supply pipes, and a glass supply path forming process for connecting the glass supply pipe to form a glass supply path after the preheating process. The preheating step includes a closing step of closing at least a part of the opening of the glass supply pipe with a closing member.
本発明によれば、ガラス供給管の予熱を効率良く行うことが可能になる。
According to the present invention, it is possible to efficiently preheat the glass supply pipe.
以下、本発明を実施するための形態について図面を参照しながら説明する。図1乃至図6は、本発明に係るガラス製造装置及びガラス製造方法の第一実施形態を示す。
Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. 1 to 6 show a first embodiment of a glass manufacturing apparatus and a glass manufacturing method according to the present invention.
図1に示すように、本実施形態に係るガラス製造装置は、上流側から順に、溶解槽1と、清澄槽2と、均質化槽3と、状態調整槽4と、成形槽5と、各槽1~5を連結するガラス供給路6a~6dとを備える。この他、ガラス製造装置は、成形槽5により成形された板ガラスGRの除歪処理を行う徐冷炉(図示せず)及び除歪処理後に板ガラスGRを切断する切断装置(図示せず)を備え得る。
As shown in FIG. 1, the glass manufacturing apparatus which concerns on this embodiment is the dissolution tank 1, the clarification tank 2, the homogenization tank 3, the state adjustment tank 4, the molding tank 5, and each in order from an upstream side. Glass supply paths 6a to 6d for connecting the tanks 1 to 5 are provided. In addition, the glass manufacturing apparatus may include a slow cooling furnace (not shown) that performs a distortion removing process on the sheet glass GR formed by the forming tank 5 and a cutting device (not shown) that cuts the sheet glass GR after the distortion removing process.
溶解槽1は、投入されたガラス原料を溶解して溶融ガラスGMを生成する溶解工程を行うための容器である。溶解槽1は、ガラス供給路6aを介して清澄槽2に接続されている。清澄槽2は、溶解槽1から供給された溶融ガラスGMを清澄剤等の作用により脱泡する清澄工程を行うための容器である。清澄槽2は、ガラス供給路6bを介して均質化槽3に接続されている。
The melting tank 1 is a container for performing a melting step of melting molten glass raw material and generating molten glass GM. The dissolution tank 1 is connected to the clarification tank 2 through the glass supply path 6a. The clarification tank 2 is a container for performing a clarification step of defoaming the molten glass GM supplied from the dissolution tank 1 by the action of a clarifier or the like. The clarification tank 2 is connected to the homogenization tank 3 through the glass supply path 6b.
均質化槽3は、清澄された溶融ガラスGMを攪拌翼等により攪拌し、均一化する均質化工程を行うための容器である。均質化槽3は、ガラス供給路6cを介して状態調整槽4に接続されている。状態調整槽4は、溶融ガラスGMを成形に適した状態に調整する状態調整工程を行うための容器である。状態調整槽4は、ガラス供給路6dを介して成形槽5に接続されている。
The homogenization tank 3 is a container for performing a homogenization process in which the clarified molten glass GM is stirred with a stirring blade or the like to make it uniform. The homogenization tank 3 is connected to the state adjustment tank 4 through the glass supply path 6c. The state adjustment tank 4 is a container for performing a state adjustment process for adjusting the molten glass GM to a state suitable for molding. The state adjustment tank 4 is connected to the forming tank 5 through a glass supply path 6d.
成形槽5は、溶融ガラスGMを所望の形状に成形するための容器である。本実施形態では、成形槽5は、オーバーフローダウンドロー法によって溶融ガラスGMを板状に成形する。詳細には、成形槽5は、断面形状(図1の紙面と直交する断面形状)が略楔形状を成しており、この成形槽5の上部には、オーバーフロー溝(図示せず)が形成されている。
The forming tank 5 is a container for forming the molten glass GM into a desired shape. In the present embodiment, the forming tank 5 forms the molten glass GM into a plate shape by the overflow down draw method. Specifically, the forming tank 5 has a substantially wedge-shaped cross section (a cross section perpendicular to the paper surface of FIG. 1), and an overflow groove (not shown) is formed in the upper part of the forming tank 5. Has been.
成形槽5は、ガラス供給路6dによって溶融ガラスGMがオーバーフロー溝に供給された後、溶融ガラスGMをオーバーフロー溝から溢れ出させて、成形槽5の両側の側壁面(紙面の表裏面側に位置する側面)に沿って流下させる。成形槽5は、流下させた溶融ガラスGMを側壁面の下端部で融合させ、板ガラスGRに成形する。
After the molten glass GM is supplied to the overflow groove by the glass supply path 6d, the molding tank 5 overflows the molten glass GM from the overflow groove, and the side walls on both sides of the forming tank 5 (positioned on the front and back sides of the paper surface). Flow down along the side). The forming tank 5 fuses the molten glass GM that has flowed down at the lower end of the side wall surface, and forms the glass sheet GR.
成形された板ガラスGRは、例えば、厚みが0.01~10mmであって、液晶ディスプレイや有機ELディスプレイなどのフラットパネルディスプレイ、有機EL照明、太陽電池などの基板や保護カバーに利用される。なお、成形槽5は、スロットダウンドロー法などの他のダウンドロー法を実行するものであってもよい。
The formed sheet glass GR has a thickness of 0.01 to 10 mm, for example, and is used for a flat panel display such as a liquid crystal display or an organic EL display, an organic EL illumination, a substrate such as a solar cell, or a protective cover. The forming tank 5 may execute another downdraw method such as a slot downdraw method.
ガラス供給路6a~6dは、溶融ガラスGMを上流側の溶解槽1から下流側の成形槽5に移送するガラス供給工程を行うための構成要素である。図2に示すように、ガラス供給路6a~6dは、複数のガラス供給管7を連結してなる。ガラス供給路6a~6dを構成する複数のガラス供給管7は、絶縁部材8を介して相互に連結される。絶縁部材8は中央部に開口部を有する環状に構成される。
The glass supply paths 6a to 6d are components for performing a glass supply process for transferring the molten glass GM from the upstream melting tank 1 to the downstream forming tank 5. As shown in FIG. 2, the glass supply paths 6a to 6d are formed by connecting a plurality of glass supply tubes 7. The plurality of glass supply pipes 7 constituting the glass supply paths 6a to 6d are connected to each other through an insulating member 8. The insulating member 8 is configured in an annular shape having an opening at the center.
図3に示すように、ガラス供給路6a~6dは、ガラス供給管7毎に分離できる。ガラス供給管7は、白金又は白金合金により構成される。ガラス供給管7は、長尺状のケーシング9に被覆される。ガラス供給管7は、溶融ガラスGMを移送する長尺状の本体部10と、本体部10の端部に設けられる通電加熱部11a,11bとを備える。
As shown in FIG. 3, the glass supply paths 6a to 6d can be separated for each glass supply pipe 7. The glass supply tube 7 is made of platinum or a platinum alloy. The glass supply tube 7 is covered with a long casing 9. The glass supply tube 7 includes a long main body 10 that transfers the molten glass GM, and energization heating units 11 a and 11 b that are provided at the ends of the main body 10.
本体部10は、筒状(例えば円筒状)に構成されるが、この形状に限定されない。本体部10は、ケーシング9よりも長く構成される。このため、本体部10の各端部は、ケーシング9と端部から長手方向に突出している。
The main body 10 is configured in a cylindrical shape (for example, a cylindrical shape), but is not limited to this shape. The main body 10 is configured to be longer than the casing 9. For this reason, each edge part of the main-body part 10 protrudes in the longitudinal direction from the casing 9 and edge part.
通電加熱部11a,11bは、本体部10の一端部に設けられる第一通電加熱部11aと、本体部10の他端部に設けられる第二通電加熱部11bとを含む。各通電加熱部11a,11bは、本体部10の端部における外周面を囲むように構成されるフランジ部12と、このフランジ部12の上部に一体に構成される電極部13とを有する。各通電加熱部11a,11bは、電極部13に所定の電圧を印加することで本体部10を直接的に通電加熱する。
The energization heating units 11 a and 11 b include a first energization heating unit 11 a provided at one end of the main body 10 and a second energization heating unit 11 b provided at the other end of the main body 10. Each of the energization heating units 11 a and 11 b includes a flange portion 12 configured to surround the outer peripheral surface at the end of the main body portion 10, and an electrode portion 13 configured integrally with the upper portion of the flange portion 12. Each energization heating part 11a, 11b directly energizes and heats the main body part 10 by applying a predetermined voltage to the electrode part 13.
フランジ部12は、円板状に構成されるが、この形状に限定されない。電極部13は、フランジ部12の上部から上方に突出する矩形状の板部であるが、この形状に限定されない。
The flange portion 12 is configured in a disc shape, but is not limited to this shape. The electrode portion 13 is a rectangular plate portion protruding upward from the upper portion of the flange portion 12, but is not limited to this shape.
フランジ部12の表面(外面)には、冷却部14が設けられる。冷却部14は、冷却媒体を流通させることが可能な配管により構成される。冷却部14は、溶接その他の手段により、フランジ部12の表面に固定されている。冷却部14は、銅、ニッケル合金その他の金属により構成される。冷却部14は、フランジ部12に配される第一の部分14aと、電極部13に配される第二の部分14bとを有する。
The cooling part 14 is provided on the surface (outer surface) of the flange part 12. The cooling unit 14 is configured by a pipe capable of circulating a cooling medium. The cooling part 14 is fixed to the surface of the flange part 12 by welding or other means. The cooling unit 14 is made of copper, nickel alloy, or other metal. The cooling unit 14 includes a first portion 14 a disposed on the flange portion 12 and a second portion 14 b disposed on the electrode portion 13.
第一の部分14aは、円板状に構成されるフランジ部12の縁部に沿うように円形に構成される。第二の部分14bは、電極部13の長手方向(上下方向)に沿うように直線状に構成される。第二の部分14bは、第一の部分14aに冷却媒体を供給する流入部14cと、第一の部分14aを通過した冷却媒体を取り出す排出部14dとを含む。なお、冷却部14を流通する冷却媒体としては、水、空気その他の各種流体が使用される。
The first portion 14a is configured in a circular shape so as to follow the edge of the flange portion 12 configured in a disc shape. The second portion 14b is configured in a straight line along the longitudinal direction (vertical direction) of the electrode portion 13. The second portion 14b includes an inflow portion 14c that supplies a cooling medium to the first portion 14a, and a discharge portion 14d that takes out the cooling medium that has passed through the first portion 14a. In addition, as a cooling medium which distribute | circulates the cooling part 14, water, air, and various other fluids are used.
ケーシング9は、鋼その他の金属により円筒体として構成されるが、この形状に限定されない。ケーシング9は、ガラス供給管7の本体部10の外周面を包囲するように配される耐火物(例えば耐火煉瓦)15を収容する。ケーシング9の内径は、ガラス供給管7における本体部10の外径よりも大きく設定される。これにより、ケーシング9と本体部10との間には、耐火物15を収容可能な空間が形成される。なお、ケーシング9は、ガラス製造装置が配置される工場等の建屋内において、図示しない架台等により位置変更可能に支持されている。
Casing 9 is formed as a cylindrical body of steel or other metal, but is not limited to this shape. The casing 9 accommodates a refractory material (for example, refractory brick) 15 arranged so as to surround the outer peripheral surface of the main body portion 10 of the glass supply pipe 7. The inner diameter of the casing 9 is set larger than the outer diameter of the main body 10 in the glass supply pipe 7. Thereby, a space capable of accommodating the refractory 15 is formed between the casing 9 and the main body 10. The casing 9 is supported in a building such as a factory in which the glass manufacturing apparatus is arranged so that the position of the casing 9 can be changed by a mount (not shown).
以下、上記構成のガラス製造装置を使用して板ガラスGRを製造する方法について説明する。
Hereinafter, a method of manufacturing the plate glass GR using the glass manufacturing apparatus having the above configuration will be described.
本方法は、溶解槽1にて原料ガラスを溶解させ(溶解工程)、溶融ガラスGMを得た後、この溶融ガラスGMに対し、順に清澄槽2による清澄工程、均質化槽3による均質化工程、及び状態調整槽4による状態調整工程を実施する。その後、この溶融ガラスGMを成形槽5に移送し、成形槽5により溶融ガラスGMから板ガラスGRを成形する(成形工程)。溶融ガラスGMは、溶解槽1から成形槽5まで、ガラス供給路6a~6dによって移送される(ガラス供給工程)。成形工程後に、徐冷炉により板ガラスGRの内部歪みが除去される(徐冷工程)。徐冷工程後に、板ガラスGRは、所定寸法に切断され(切断工程)、あるいはロール状に巻き取られる(巻取工程)。
In this method, after the raw glass is melted in the melting tank 1 (melting process) to obtain the molten glass GM, the clarification process by the clarification tank 2 and the homogenization process by the homogenization tank 3 are sequentially performed on the molten glass GM. And the state adjustment process by the state adjustment tank 4 is implemented. Thereafter, the molten glass GM is transferred to the forming tank 5, and the plate glass GR is formed from the molten glass GM in the forming tank 5 (forming step). The molten glass GM is transferred from the melting tank 1 to the forming tank 5 through the glass supply paths 6a to 6d (glass supply process). After the forming step, the internal strain of the sheet glass GR is removed by a slow cooling furnace (slow cooling step). After the slow cooling step, the plate glass GR is cut into a predetermined dimension (cutting step) or wound into a roll (winding step).
以上のような一連の工程を実行するにあたり、事前にガラス供給路6a~6d及び他の構成要素1~5を加熱する必要がある(予熱工程)。予熱工程は、各ガラス供給路6a~6dを、その構成要素であるガラス供給管7に分離した状態で、各ガラス供給管7に対して実行される。
In executing the series of steps as described above, it is necessary to heat the glass supply paths 6a to 6d and the other components 1 to 5 in advance (preheating step). The preheating step is performed on each glass supply pipe 7 in a state where the glass supply paths 6a to 6d are separated into the glass supply pipes 7 that are constituent elements thereof.
以下、ガラス供給管7の予熱工程(予熱方法)について、図4乃至図6を参照しながら詳細に説明する。予熱工程は、ガラス供給管7の端部における開口部7aを閉塞する工程(閉塞工程)と、ガラス供給管7を加熱する工程(加熱工程)とを備える。
Hereinafter, the preheating process (preheating method) of the glass supply pipe 7 will be described in detail with reference to FIGS. The preheating step includes a step of closing the opening 7a at the end of the glass supply tube 7 (blocking step) and a step of heating the glass supply tube 7 (heating step).
閉塞工程では、閉塞部材16によってガラス供給管7の開口部7aを閉塞する。閉塞部材16は、例えば、耐熱繊維からなるブランケットや耐火ペーパー等の耐熱性および可撓変形性を有する部材により構成されることが好ましい。閉塞部材16は、例えばアルミナ繊維等のセラミックス繊維により構成されるが、この構成に限定されない。なお、閉塞部材16は、耐火ボードや、耐火煉瓦、その他耐熱性を有する板状部材により構成され得る。閉塞部材16の形状は、開口部7aの形状に応じた形状とすることができ、例えば、開口部7aの相似形とすることができる。本実施形態では、閉塞部材16は、円形状の主面を有する厚肉シート状に構成される。閉塞部材16の直径は、ガラス供給管7の開口部7aよりも大きく、冷却部14における第一の部分14a(円形部分)の直径よりも小さい。これにより、閉塞部材16は、冷却部14に接触することなく、フランジ部12の表面(外面)に接触する。なお、閉塞部材16の形状は、上記形状に限らず、矩形状、楕円状等の形状として良い。
In the closing step, the opening 7a of the glass supply tube 7 is closed by the closing member 16. The closing member 16 is preferably composed of a member having heat resistance and flexible deformability, such as a blanket made of heat-resistant fibers and fireproof paper. The closing member 16 is made of ceramic fibers such as alumina fibers, but is not limited to this structure. The closing member 16 may be constituted by a fire-resistant board, fire-resistant brick, or other plate member having heat resistance. The shape of the closing member 16 can be a shape corresponding to the shape of the opening 7a, for example, a similar shape of the opening 7a. In the present embodiment, the closing member 16 is formed in a thick sheet shape having a circular main surface. The diameter of the closing member 16 is larger than the opening 7 a of the glass supply pipe 7 and smaller than the diameter of the first portion 14 a (circular portion) in the cooling unit 14. Thereby, the closure member 16 contacts the surface (outer surface) of the flange part 12 without contacting the cooling part 14. The shape of the closing member 16 is not limited to the above shape, and may be a rectangular shape, an elliptical shape, or the like.
閉塞部材16は、固定部材17を介してケーシング9に支持される。固定部材17は、耐熱性を有する線状部材により構成される。固定部材17は、本体部10等の膨張に応じて伸縮するよう、伸縮性を有する材質から成ることが好ましい。具体的には、固定部材17としては、例えばセラミックファイバを撚り合わせたロープ等を用いることができる。ケーシング9は、固定部材17を係止する複数(図例では四個)の支持部18を有する。各支持部18は、ケーシング9の外周面から突出する板部であるが、この形状に限定されない。
The closing member 16 is supported by the casing 9 via the fixing member 17. The fixing member 17 is composed of a linear member having heat resistance. The fixing member 17 is preferably made of a stretchable material so as to expand and contract in accordance with the expansion of the main body 10 and the like. Specifically, for example, a rope formed by twisting ceramic fibers can be used as the fixing member 17. The casing 9 has a plurality of (four in the illustrated example) support portions 18 that lock the fixing member 17. Each support portion 18 is a plate portion protruding from the outer peripheral surface of the casing 9, but is not limited to this shape.
支持部18は、固定部材17を係止する部分(係止部)18aを有する。固定部材17は、閉塞部材16をフランジ部12に接触させて本体部10の開口部7aを閉塞した状態で、当該閉塞部材16に巻き付けられる。固定部材17は、係止部18aに係止されることにより、閉塞部材16をフランジ部12に固定する。
The support portion 18 has a portion (locking portion) 18 a for locking the fixing member 17. The fixing member 17 is wound around the closing member 16 in a state where the closing member 16 is brought into contact with the flange portion 12 to close the opening 7 a of the main body portion 10. The fixing member 17 fixes the closing member 16 to the flange portion 12 by being locked to the locking portion 18a.
閉塞工程が終了すると、加熱工程に移行する。加熱工程では、電極部13に電圧を印加し、加熱を開始する。加熱工程では、冷却部14に冷却媒体を流通させ、各通電加熱部11a,11bを冷却しつつ、本体部10を加熱する。閉塞部材16は、溶融ガラスGMを移送するに足る温度にまで加熱された後、ガラス供給管7から取り外される。閉塞部材16が取り外されたガラス供給管7は、他のガラス供給管7に接続される。複数のガラス供給管7を接続することにより、ガラス供給路6a~6dが構成される(ガラス供給路形成工程)。なお、ガラス供給路形成工程においては、接続されるガラス供給管7各々の開口部7aが互いに対向するよう予め隣接させた状態で閉塞部材16を取り外し、即座に各ガラス供給管7を接続することが好ましい。このような接続方法によれば、ガラス供給管7を高温に維持しつつガラス供給路6a~6dを形成可能である。
When the closing process is completed, the process moves to the heating process. In the heating step, a voltage is applied to the electrode portion 13 to start heating. In the heating step, the main body 10 is heated while circulating the cooling medium through the cooling unit 14 and cooling the energization heating units 11a and 11b. The closing member 16 is removed from the glass supply pipe 7 after being heated to a temperature sufficient to transfer the molten glass GM. The glass supply pipe 7 from which the closing member 16 has been removed is connected to another glass supply pipe 7. By connecting a plurality of glass supply pipes 7, glass supply paths 6a to 6d are formed (glass supply path forming step). In addition, in the glass supply path forming step, the closing member 16 is removed in a state where the openings 7a of the glass supply pipes 7 to be connected face each other in advance, and the glass supply pipes 7 are immediately connected. Is preferred. According to such a connection method, the glass supply paths 6a to 6d can be formed while maintaining the glass supply pipe 7 at a high temperature.
その後、ガラス供給路6a~6dを、対応する他の構成要素1~5に接続し、ガラス製造装置を組み立てる(ガラス製造装置の組立工程)。なお、ガラス供給路6a~6dを除く他の構成要素1~5には、要所に通電加熱部が設けられている。各構成要素1~5には、ガラス供給管7の予熱と同時期に、通電加熱部による加熱工程が実行される。
Thereafter, the glass supply paths 6a to 6d are connected to the corresponding other components 1 to 5 to assemble the glass manufacturing apparatus (assembly process of the glass manufacturing apparatus). In addition, in the other constituent elements 1 to 5 except for the glass supply paths 6a to 6d, an energization heating unit is provided at a main point. Each of the components 1 to 5 is subjected to a heating process by an energization heating unit at the same time as the preheating of the glass supply pipe 7.
その後、既述の溶解工程、清澄工程、均質化工程、状態調整工程、及び成形工程等が実行され、板ガラスGRが製造される。
Thereafter, the above-described dissolution process, clarification process, homogenization process, state adjustment process, molding process, and the like are performed, and the plate glass GR is manufactured.
以上説明した本実施形態に係るガラス製造方法(ガラス供給管7の予熱方法)では、予熱工程において、ガラス供給管7の開口部7aを閉塞部材16によって閉塞することで、本体部10内を外部から遮蔽する。これにより、本体部10の熱が内部から開口部7aを通じて外部に放射することによる熱損失を可及的に低減できる。これにより、ガラス供給管7の予熱を効率良く行うことが可能になる。
In the glass manufacturing method (preheating method of the glass supply pipe 7) according to the present embodiment described above, the inside of the main body 10 is externally closed by closing the opening 7a of the glass supply pipe 7 with the closing member 16 in the preheating step. Shield from. Thereby, the heat loss by the heat | fever of the main-body part 10 radiating outside from the inside through the opening part 7a can be reduced as much as possible. This makes it possible to efficiently preheat the glass supply pipe 7.
また、閉塞部材16は、各通電加熱部11a,11bの冷却部14に接触することなく、フランジ部12に固定される。したがって、閉塞部材16が冷却部14に接触して当該冷却部14が過剰に加熱されることを防止できる。
Further, the closing member 16 is fixed to the flange portion 12 without contacting the cooling portion 14 of each of the energization heating portions 11a and 11b. Therefore, it can prevent that the closure member 16 contacts the cooling part 14, and the said cooling part 14 is heated excessively.
図7及び図8は、本発明の第二実施形態を示す。上記の第一実施形態では、閉塞部材16が円板状に構成されていたが、本実施形態では、矩形状に構成される。閉塞部材16の寸法は、冷却部14における第一の部分14aの直径よりも大きく設定されている。したがって、閉塞部材16は、第一実施形態と比較して、より広範囲で各通電加熱部11a,11bを被覆する。これにより、ガラス供給管7(本体部10)の開口部7aからの熱の放射を防止するとともに、フランジ部12の表面からの熱の放射をも阻止する。これにより、ガラス供給管7の予熱を効率良く行うことができる。
7 and 8 show a second embodiment of the present invention. In the first embodiment described above, the closing member 16 is configured in a disc shape, but in the present embodiment, it is configured in a rectangular shape. The dimension of the closing member 16 is set to be larger than the diameter of the first portion 14 a in the cooling unit 14. Therefore, the closing member 16 covers the energization heating units 11a and 11b in a wider range than in the first embodiment. This prevents radiation of heat from the opening 7a of the glass supply tube 7 (main body portion 10) and also prevents radiation of heat from the surface of the flange portion 12. Thereby, the preheating of the glass supply pipe 7 can be performed efficiently.
図9及び図10は、本発明の第三実施形態を示す。本実施形態において、閉塞部材16は、ガラス供給管7の開口部7aの開口面積とほぼ同じ面積を有する円形の板部材又はブロック材である。閉塞部材16は、ガラス供給管7の開口部7aに挿入されることで当該開口部7aを閉塞する。この場合、閉塞部材16は、ガラス供給管の開口部7aの内面に保持されることから、第一実施形態で例示した固定部材17及びケーシング9の支持部18を要しない。
9 and 10 show a third embodiment of the present invention. In the present embodiment, the closing member 16 is a circular plate member or block material having substantially the same area as the opening area of the opening 7 a of the glass supply tube 7. The closing member 16 closes the opening 7 a by being inserted into the opening 7 a of the glass supply pipe 7. In this case, since the closing member 16 is held on the inner surface of the opening 7a of the glass supply tube, the fixing member 17 and the support portion 18 of the casing 9 illustrated in the first embodiment are not required.
なお、本発明は、上記実施形態の構成に限定されるものではなく、上記した作用効果に限定されるものでもない。本発明は、本発明の要旨を逸脱しない範囲で種々の変更が可能である。
In addition, this invention is not limited to the structure of the said embodiment, It is not limited to the above-mentioned effect. The present invention can be variously modified without departing from the gist of the present invention.
上記の実施形態では、ガラス供給路6a~6dのガラス供給管7における開口部7aを閉塞部材16で閉塞する例を示したが、これに限定されない。ガラス製造装置における他の構成要素、すなわち溶解槽1、清澄槽2、均質化槽3、状態調整槽4、成形槽5においても、溶融ガラスGMを移送する機能を有しており、これらをガラス供給管7と見做すことができる。
In the above embodiment, the example in which the opening 7a in the glass supply pipe 7 of the glass supply paths 6a to 6d is closed by the closing member 16 has been described, but the present invention is not limited to this. Other components in the glass manufacturing apparatus, that is, the dissolution tank 1, the clarification tank 2, the homogenization tank 3, the state adjustment tank 4, and the molding tank 5 also have a function of transferring the molten glass GM, It can be regarded as the supply pipe 7.
例えば、清澄槽2には、溶融ガラスGMの脱泡処理により発生するガスを排出するベント部が設けられる。本発明では、予熱工程の実施にあたり、清澄槽2における溶融ガラスGMの流出入に係る開口部に加え、ベント部の開口部を閉塞部材16によって閉塞することが望ましい。このように、予熱が必要な構成要素の開口部を閉塞部材16によって閉塞することで、予熱工程を効率良く実施できる。
For example, the clarification tank 2 is provided with a vent part for discharging gas generated by the defoaming process of the molten glass GM. In the present invention, it is desirable to close the opening of the vent portion with the closing member 16 in addition to the opening related to the inflow and outflow of the molten glass GM in the clarification tank 2 when performing the preheating step. Thus, the preheating process can be efficiently carried out by closing the openings of the components that require preheating with the closing member 16.
上記の実施形態では、閉塞部材16を線状の固定部材17によって通電加熱部11a,11bのフランジ部12に固定する例を示したが、この構成限定されない。例えばクランプその他の固定手段によって閉塞部材16をフランジ部12に固定してもよい。
In the above embodiment, the example in which the closing member 16 is fixed to the flange portion 12 of the energization heating portions 11a and 11b by the linear fixing member 17 is shown, but this configuration is not limited. For example, the closing member 16 may be fixed to the flange portion 12 by a clamp or other fixing means.
上記の実施形態では、ガラス製造方法として、板ガラス、及び板ガラスをロール状に巻き取って構成されるガラスロールを製造する方法を示したが、これに限定されない。本発明は、ガラス管、ガラスブロックその他の各種ガラス製品を製造する方法に適用される。
In the above embodiment, as a glass manufacturing method, a glass glass and a method of manufacturing a glass roll configured by winding a glass sheet into a roll shape are shown, but the present invention is not limited to this. The present invention is applied to a method of manufacturing a glass tube, a glass block and other various glass products.
上記の実施形態では、ガラス供給管7の開口部7aの全部を閉塞部材16により閉塞した例を示したが、これに限定されず、開口部7aの一部を閉塞して予熱工程を行ってもよい。すなわち、閉塞部材16によって開口部7aの一部が閉塞された場合に、開口部7aには若干の隙間が生じてもよい。
In the above embodiment, an example in which the entire opening 7a of the glass supply pipe 7 is closed by the closing member 16 has been shown. However, the present invention is not limited to this, and a preheating process is performed by closing a part of the opening 7a. Also good. That is, when a part of the opening 7a is closed by the closing member 16, a slight gap may be generated in the opening 7a.
6a ガラス供給路
6b ガラス供給路
6c ガラス供給路
6d ガラス供給路
7 ガラス供給管
7a 開口部
9 ケーシング
10 本体部
12 フランジ部
16 閉塞部材
17 固定部材
GM 溶融ガラス
GR 板ガラス 6aGlass supply path 6b Glass supply path 6c Glass supply path 6d Glass supply path 7 Glass supply pipe 7a Opening 9 Casing 10 Main body part 12 Flange part 16 Closing member 17 Fixing member GM Molten glass GR Sheet glass
6b ガラス供給路
6c ガラス供給路
6d ガラス供給路
7 ガラス供給管
7a 開口部
9 ケーシング
10 本体部
12 フランジ部
16 閉塞部材
17 固定部材
GM 溶融ガラス
GR 板ガラス 6a
Claims (7)
- ガラス原料を溶解して溶融ガラスを生成する溶解工程と、前記溶融ガラスを成形する成形工程と、複数のガラス供給管を連結してなるガラス供給路によって前記溶融ガラスを溶解工程から成形工程へと移送するガラス供給工程と、を備えるガラス製造方法において、
前記ガラス供給工程の前に、予め前記ガラス供給管を分離した状態で通電加熱する予熱工程と、前記予熱工程後に、前記ガラス供給管を接続して前記ガラス供給路を構成するガラス供給路形成工程と、をさらに備え、
前記予熱工程は、前記ガラス供給管の開口部の少なくとも一部を閉塞部材により塞ぐ閉塞工程を備えることを特徴とする、ガラス製造方法。 From the melting step to the molding step, the melting step of melting the glass raw material to form molten glass, the molding step of molding the molten glass, and the glass supply path formed by connecting a plurality of glass supply pipes. In a glass manufacturing method comprising a glass supply step for transferring,
Before the glass supply step, a preheating step in which the glass supply pipe is separated and heated in advance, and after the preheating step, the glass supply path is formed by connecting the glass supply pipe to form the glass supply path. And further comprising
The preheating step includes a closing step of closing at least a part of the opening of the glass supply pipe with a closing member. - 前記閉塞部材は、可撓耐熱性部材から成る、請求項1に記載のガラス製造方法。 2. The glass manufacturing method according to claim 1, wherein the closing member is made of a flexible heat resistant member.
- 前記閉塞部材は、耐熱繊維からなるブランケットである、請求項2に記載のガラス製造方法。 3. The glass manufacturing method according to claim 2, wherein the closing member is a blanket made of heat-resistant fibers.
- 前記閉塞部材は、耐火性の板部材である、請求項1に記載のガラス製造方法。 2. The glass manufacturing method according to claim 1, wherein the closing member is a fire-resistant plate member.
- 前記ガラス供給管は、ケーシングに収容される筒状の本体部と、前記本体部の端部に形成されるフランジ部とを備え、
前記閉塞工程において、前記閉塞部材は、前記フランジ部に接触した状態で前記ガラス供給管の前記開口部を閉塞するとともに、固定部材を介して前記ケーシングに支持される、請求項1から4のいずれか一項に記載のガラス製造方法。 The glass supply pipe includes a cylindrical main body portion accommodated in a casing, and a flange portion formed at an end portion of the main body portion,
5. The method according to claim 1, wherein, in the closing step, the closing member closes the opening of the glass supply pipe while being in contact with the flange portion, and is supported by the casing via a fixing member. The glass manufacturing method as described in any one. - 前記予熱工程では、前記ガラス供給管の外周面を耐火物により包囲する、請求項1から5のいずれか一項に記載のガラス製造方法。 The glass manufacturing method according to any one of claims 1 to 5, wherein in the preheating step, an outer peripheral surface of the glass supply pipe is surrounded by a refractory.
- 複数のガラス供給管を通電加熱する予熱工程と、予熱工程後に、前記ガラス供給管を接続してガラス供給路を構成するガラス供給路形成工程と、を備え、
前記予熱工程は、前記ガラス供給管の開口部の少なくとも一部を閉塞部材により塞ぐ閉塞工程を備えることを特徴とする、ガラス供給管の予熱方法。 A preheating step of energizing and heating a plurality of glass supply tubes; and a glass supply passage forming step of connecting the glass supply tubes to form a glass supply passage after the preheating step,
The preheating step includes a closing step of closing at least a part of the opening of the glass supply tube with a closing member.
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WO2020068569A1 (en) * | 2018-09-27 | 2020-04-02 | Corning Incorporated | Glass forming apparatuses comprising modular glass fining systems |
US20210347668A1 (en) * | 2018-09-27 | 2021-11-11 | Corning Incorporated | Glass forming apparatuses comprising modular glass fining systems |
EP3856691B1 (en) * | 2018-09-27 | 2022-08-31 | Corning Incorporated | Assembly for supporting an electrical flange in a glass manufacturing apparatus |
US11919800B2 (en) | 2018-09-27 | 2024-03-05 | Corning Incorporated | Modular molten glass delivery apparatus |
US12017944B2 (en) | 2018-09-27 | 2024-06-25 | Corning Incorporated | Glass forming apparatuses comprising modular glass fining systems |
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TWI727124B (en) | 2021-05-11 |
KR102331496B1 (en) | 2021-11-26 |
CN110291048A (en) | 2019-09-27 |
TW201829327A (en) | 2018-08-16 |
JP2018131345A (en) | 2018-08-23 |
JP6724813B2 (en) | 2020-07-15 |
CN110291048B (en) | 2021-07-06 |
KR20190113755A (en) | 2019-10-08 |
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