JP2007261914A - Method for manufacturing glass and glass raw material feeding implement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing glass by which a batch loss is reduced and light transmittance is improved and a glass raw material feeding implement. <P>SOLUTION: The glass raw material feeding implement 10 includes a bucket 1 which is formed with a recessed part 11 housing a glass raw material G and in which a cooling medium circulates and an arm 2 which is coupled on one end side to the bucket 1 and is provided with a handle 3 at the other end side for inverting the bucket 1 around the axis. The arm 2 has an inner tube 21 to which the cooling medium is supplied and which delivers the cooling medium to the inside of the bucket 2, and an outer tube 22 which surrounds the inner tube 21 and discharges the cooling medium from the inside of the inner tube 21. By cooling the glass raw material feeding implement 10 to ≤200°C and maintaining the same before and after feeding of the glass raw material G, the intrusion of impurities into the glass from the glass raw material feeding implement 10 is suppressed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a glass manufacturing method and a glass raw material charging tool. In particular, the present invention relates to a glass manufacturing method including a step of charging a glass raw material into a melting tank using a glass raw material input tool, and a structure of the glass raw material input tool.

  In general, when glass is produced, it includes a step of producing molten glass by putting a powdery or granular glass material into a high-temperature melting tank. For example, molten glass is cooled and then crushed to produce a so-called cullet. Next, the cullet is melted again, and the melted glass is discharged to form preforms used as base materials such as various optical glasses, optical element preforms, optical elements, or optical fibers.

  For example, in a glass manufacturing method including a step of charging a glass raw material into a melting tank, the powdered glass raw material is not separated into the melting tank and is evenly charged, and the quality of the molten glass dough is made uniform. A glass raw material charging apparatus has been invented that simplifies the apparatus and facilitates maintenance and management (see, for example, Patent Document 1).

  The glass raw material charging device according to Patent Document 1 includes a bed, a slider, and a bucket support arm. The bed is provided so as to be movable in the front-rear direction on the base. The slider is provided so as to be movable in the left-right direction on the bed. The bucket support arm is rotatably provided on the slider in the axial circumferential direction, and has a bucket at the tip. And the bucket is installed so that it can enter / exit from the raw material inlet of a dissolution tank.

  Since the glass raw material charging device according to Patent Document 1 is configured as described above, the glass raw material is not a continuous supply method using a conveyor or a vibration feeder, but an intermittent supply method using a bucket. Regardless of the type of melting tank, it is possible to homogenize the molten glass dough without separating the powder glass raw material and evenly into the melting tank, generating bubbles due to batch stones and gas It is also possible to prevent and improve the quality and uniformity of products.

In addition, when using the glass raw material charging apparatus according to Patent Document 1 for a hot-top type melting tank, it is preferable that the bucket support arm is provided with a cooling mechanism, and the raw material charging port of the melting tank is provided with an open / close door. It is said. And when the melting tank is a hot top system, if the bucket support arm inserted into the melting tank is cooled, the glass raw material can be uniformly introduced to the entire surface of the melting tank, and the temperature difference in each place in the melting tank The generation of bubbles and batch stones due to convection of glass is prevented, and the molten glass dough can be homogenized even in a small-capacity melting tank.
Japanese Patent Laid-Open No. 6-80426

  In the case where a glass raw material charging tool equipped with a bucket is used and a process of introducing a glass raw material into a relatively small hot-top type melting tank is employed, as in Patent Document 1, the melting tank heats for a short time. The bucket support arm is not cooled because there is no risk of deformation or damage to the bucket support arm. Moreover, in patent document 1, since the inside of the bucket support arm is hollow, the cooling water is circulated in the hollow portion, and the bucket is a double wall, and the cooling water is not circulated in the space of the double wall. The bucket cooling effect was insufficient.

  In the step of charging the glass raw material into the melting tank, the mixed glass raw material (so-called batch) is accommodated in a bucket, this bucket is inserted into the melting tank, and then the bucket is inverted to form a batch in the melting tank. It is thrown. And a bucket is pulled out from a dissolution tank and the next batch is accommodated in a bucket. By repeating such an operation, a predetermined amount of batch is charged into the dissolution tank.

  Even when the bucket stays in the dissolution tank for a short time, for example, about 5 seconds, the bucket is gradually heated by repeating the above-described operation. Then, a phenomenon that the batch adheres to the bucket occurs. The batch adheres slowly but remains gradually. Until the remaining adhered batch is forcibly peeled or spontaneously dropped from the bucket, there is a problem of so-called batch loss that reduces the input amount per bucket.

  On the other hand, there is a case where the required light transmittance cannot be obtained with glass for optical fibers where light transmittance is regarded as important. In some cases, a glass component for an optical fiber sometimes contains a coloring component that hinders light transmittance. The inventor considered that there was a factor in the process of charging the glass material into the melting tank using the glass material charging tool. This is because, for example, the member constituting the bucket includes a transition metal component such as iron (Fe) chromium (Cr) serving as a coloring component. In addition, as a route for mixing these colored components, the adhering batch and the bucket surface chemically react at a high temperature in the melting furnace, and transition metal components such as Fe and Cr components originally mixed in the bucket are batch raw materials. At the same time, it may be possible to enter the molten glass.

  The present inventor considered a glass manufacturing method and a glass raw material charging tool for reducing batch loss in a step of charging a glass raw material into a melting tank using a glass raw material charging tool provided with a bucket, and a glass obtained by this manufacturing method. As a result of analyzing the components, the result that the coloring components were significantly reduced was obtained.

  This invention is made | formed in view of such a problem, and it aims at providing the manufacturing method of this glass, and this glass raw material insertion tool which improves a light transmittance while reducing batch loss.

  The present inventor has found that the glass raw material charging tool is maintained at a predetermined temperature or lower to reduce batch loss and improve the light transmittance, and the following new glass manufacturing method and glass raw material charging are as follows. Invented the tool.

  (1) A glass manufacturing method including a step of charging a glass raw material into a melting tank using a glass raw material charging tool, wherein the glass raw material charging tool is cooled and maintained at 200 ° C. or less before and after the glass raw material is charged. By this, the manufacturing method of the glass by which mixing of the impurity from the said glass raw material input tool to glass is suppressed.

  The manufacturing method of the glass by invention of (1) includes the process of throwing a glass raw material into a melting tank using a glass raw material input tool. Then, before and after the introduction of the glass raw material, the glass raw material input tool is kept at a temperature of 200 ° C. or lower, thereby preventing impurities from entering the glass from the glass raw material input tool.

  Here, it is preferable to keep the glass raw material charging tool cooled to 200 ° C. or lower, more preferably to keep the glass raw material charging tool cooled to 100 ° C. or lower, and to keep the glass raw material charging tool cooled to 60 ° C. or lower. Most preferred. As will be described later, the glass raw material charging tool is preferably cooled from the inside. However, it is not excluded to keep the glass raw material charging tool cooled to 200 ° C. or lower from the outside before and after the glass raw material is charged.

  The inventor manufactured a glass raw material charging tool that can be cooled from the inside, and compared and verified the batch loss due to the cooling effect when the glass raw material charging tool was cooled and when used at room temperature. As a result, good results were obtained in which the batch loss was significantly reduced by the cooling effect. Also, the transmission wavelength of the glass product obtained when the glass raw material input tool was cooled and the transmission wavelength of the glass product obtained when the glass raw material input tool was used without cooling were compared. Verified. As a result, a good result of improving the transmission wavelength by the cooling effect was obtained. That is, it is considered that impurities are suppressed from being mixed into the glass from the glass raw material charging tool.

Here, when the temperature of the bucket rises, a mechanism that easily mixes impurities, particularly coloring components, into the glass raw material has not been elucidated in detail, but as described above, the coloring components contained in the material constituting the bucket ( For example, a trace amount of iron or chromium contained in a nickel alloy and a glass material such as SiO ₂ , B ₂ O ₃ , and P ₂ 0 ₅ are chemically bonded at a high temperature, and the product falls into the molten glass. This is presumed to be one of the factors.

  (2) The glass raw material charging tool is formed with a concave portion for accommodating the glass raw material, a bucket having a double wall through which a cooling medium circulates, one end side coupled to the bucket, and the other end side coupled with the bucket. An arm provided with a handle for reversing around an axis, the arm being supplied with the cooling medium from the other end side and sending the cooling medium into the double wall, and surrounding the inner pipe An outer tube that discharges the cooling medium from the inside of the double wall to the other end side, and the bucket has the cooling medium in the double wall from the bottom surface side of the recess toward the opening side. In the step of having a plurality of partition walls in the double wall so as to circulate in the entire region, and injecting the glass raw material, the bucket is cooled so as to reduce the residual of the glass raw material (1) The manufacturing method of the glass of description.

  In the glass manufacturing method according to the invention of (2), the glass raw material input tool includes a bucket and an arm. The bucket has a double wall through which a cooling medium is circulated, forming a recess for accommodating the glass raw material. One end of the arm is coupled to the bucket, and the other end of the arm is provided with a handle that reverses the bucket about the axis.

  The arm has an inner tube and an outer tube. The inner pipe is supplied with a cooling medium from the other end side and delivers the cooling medium into the double wall. The outer pipe surrounds the inner pipe and discharges the cooling medium from the double wall to the other end side. The bucket has a plurality of partition walls in the double wall, and the cooling medium circulates in the entire region in the double wall from the bottom surface side to the opening side of the recess. Then, in the step of charging the glass raw material, the bucket is cooled so that the residual glass raw material is reduced.

  For example, the glass raw material charging tool includes a box-shaped bucket and an arm composed of a double pipe. The box-shaped bucket may be formed in a rectangular parallelepiped shape or may be formed in an elliptical column shape, and forms a concave portion that accommodates a glass raw material. In the double wall through which the cooling medium circulates, the concave portion is the inner wall, and the portion other than the concave portion can be called the outer wall. The bucket has a sealed structure so that the cooling medium can circulate in the double wall.

  If the running cost is taken into consideration for the cooling medium, it is conceivable to use water, and the glass raw material charging tool is water-cooled. By using, for example, a nonflammable gas such as nitrogen as the cooling medium, the glass raw material charging tool can be reduced in weight. If non-combustible oil is used as the cooling medium, and the non-combustible oil is radiated and cooled outside the glass raw material charging tool, the resources can be used effectively.

  The handle may be a pair of axes orthogonal to the central axis of the arm, and can grip the pair of axes and invert the bucket around the axis. The handle may be an annular handle pivoted on the arm.

  The arm has an inner tube that delivers a cooling medium into the double wall of the bucket, and an outer tube that is positioned concentrically with the inner tube. The arm has a double tube structure consisting of a concentric double structure of an inner tube and an outer tube. The inner tube and the outer tube are preferably rigid tubes, and more preferably weldable metal tubes. The bucket can be connected to one end side of the inner tube and the outer tube by welding so as to be hermetically sealed.

  For example, a rubber hose can be connected to the other end of the inner tube, and a cooling medium can be supplied from the rubber hose to the inner tube. A rubber hose can be connected to the other end of the outer tube, and the cooling medium can be discharged from the outer tube to the rubber hose. By connecting a flexible rubber hose to the arm, the arm can be rotated easily.

  Further, in the glass manufacturing method according to the invention of (2), a plurality of buckets are provided in the double wall so that the cooling medium circulates in the entire region in the double wall from the bottom surface side of the recess toward the opening side. It has a partition wall. Then, in the step of charging the glass raw material, the bucket is cooled so that the residual glass raw material is reduced.

  In the glass raw material charging tool inserted into the melting furnace, the glass raw material easily adheres to the bottom surface of the concave portion of the bucket, and the glass raw material remains most. The glass material also tends to adhere to the inner wall that surrounds the bottom surface of the recess, and the amount of residual glass material is the second largest after the bottom surface of the recess.

  Therefore, in the glass raw material throwing tool used in the glass manufacturing method according to the invention of (2), a plurality of partition walls are formed in the double wall of the bucket, and two cooling media are provided from the bottom surface side to the opening side of the recess. By adopting a structure that circulates in the entire region within the heavy wall, the cooling efficiency is improved and the residual glass raw material is reduced.

  (3) The method for producing glass according to (2), wherein the double wall of the bucket is made of a metal material.

  In the glass manufacturing method according to the invention of (3), the double wall of the bucket is preferably made of a metal material. This metal material is more preferably an alloy excellent in corrosion resistance and heat resistance. Examples of heat-resistant alloys suitable for the bucket include HA230 (manufactured by Mitsubishi Materials) and stainless steel SUS304, which are Ni-Cr heat-resistant alloys. It is also conceivable that the double wall of the bucket is made of SUS304, and HA230 is thermally sprayed in the recess in which the glass raw material is accommodated. A mode in which the bucket is formed of HA230, the arm is formed of SUS304, and they are welded to each other is also conceivable.

  (4) A glass raw material charging tool for charging a glass raw material into a melting tank, wherein a bucket having a double wall through which a cooling medium circulates is formed and a cooling medium is circulated. And an arm provided with a handle for reversing the bucket around an axis on the other end side, and the arm is supplied with the cooling medium from the other end side to dispose the cooling medium in the double wall. An inner pipe that feeds out, and an outer pipe that surrounds the inner pipe and discharges the cooling medium from the inside of the double wall to the other end side, and the bucket is directed from the bottom side of the recess toward the opening side. And a glass raw material charging tool having a plurality of partition walls in the double wall so that the cooling medium circulates in the entire region in the double wall.

  (5) The glass raw material input tool according to (4), wherein the double wall of the bucket is made of a metal material.

  The glass manufacturing method according to the present invention is a glass manufacturing method including a step of charging a glass raw material into a melting tank using a glass raw material charging tool, and the glass raw material charging tool is 200 ° C. or less before and after the glass raw material is charged. The glass raw material remaining in the glass raw material charging tool could be reduced by maintaining the cooling at a low temperature. And the impurity which inhibits a light transmittance decreased remarkably by the cooling effect with respect to a glass raw material insertion tool.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 is a perspective external view showing a step of charging a glass material into a melting tank using the glass material charging tool of one embodiment in the glass manufacturing method according to the present invention. FIG. 2 is a plan view of the glass raw material charging tool according to the embodiment. FIG. 3 is a front view of the glass raw material charging tool according to the embodiment. FIG. 4 is a right side view of the glass raw material charging tool according to the embodiment.

  FIG. 5 is a vertical cross-sectional view of the glass raw material charging tool according to the embodiment, and is a cross-sectional view taken along the line AA in FIG. 2. 6 is a cross-sectional view of the glass raw material charging tool according to the embodiment, and is a cross-sectional view taken along the line BB in FIG. FIG. 7 is a cross-sectional view of the glass raw material charging tool according to the embodiment, and is a cross-sectional view taken along the line CC in FIG. FIG. 8 is a horizontal sectional view of the glass raw material charging tool according to the embodiment, and is a sectional view taken along the line DD in FIG.

  First, the structure of the glass raw material charging tool according to the present invention will be described. In FIG. 1, a glass raw material input tool (hereinafter abbreviated as input tool) 10 includes a bucket 1 and an arm 2. The bucket 1 has a recess 11 that accommodates the glass material G, and has a double wall through which the cooling medium circulates. One end side of the arm 2 is coupled to the bucket 1, and the other end side of the arm 2 is provided with a handle 3 that reverses the bucket 1 around the axis.

  In FIG. 1, the bucket 1 has a sealed structure so that a cooling medium can circulate in the double wall. As the cooling medium, water is used in consideration of running costs, and the glass raw material charging tool 10 is water-cooled.

  2 or 5, the bucket 1 is formed in a rectangular parallelepiped box shape, and the arm 2 is formed of a double pipe. The shape of the bucket is not limited to a rectangular parallelepiped. The arm 2 includes an inner tube 21 that sends a cooling medium into the double wall of the bucket 1, and an outer tube 22 that is positioned on a concentric circle of the inner tube 21. The arm 2 has a double tube structure composed of a concentric double structure of an inner tube 21 and an outer tube 22. The outer tube 22 surrounds the inner tube 21 and discharges the cooling medium from the double wall of the bucket 1 to the other end side.

  2 or 5, the inner tube 21 and the outer tube 22 are preferably rigid tubes, and more preferably weldable metal tubes. The bucket 1 is joined to one end side of the inner tube 21 and the outer tube 22 by welding so as to be hermetically sealed. In FIG. 4, the handle 3 is composed of a pair of shafts 3 a and 3 b orthogonal to the central axis of the arm 2, and can grip the pair of shafts 3 a and 3 b to reverse the bucket 1 around the axis (see FIG. 4). 1).

  In FIG. 1 or FIG. 3, a hose (not shown) can be connected to the other end side of the inner tube 21, and the cooling medium can be supplied from the hose to the inner tube 21. A hose (not shown) can be connected to the other end of the outer tube 22 and the cooling medium can be discharged from the outer tube 22 to the hose. By connecting a flexible hose to the arm 2, the arm 2 can be rotated easily.

  Next, the cooling structure of the glass raw material input tool by this invention is demonstrated. In FIG. 5, one pipe end of the inner pipe 21 communicates with a first side wall w1 forming the bucket 1, and the cooling medium supplied to the inner pipe 21 is a first side wall constituted by a double wall. flows into w1. In the first side wall w 1, one pipe end of the inner pipe 21 is surrounded by the partition walls 1 a, 1 b, and 1 c (see FIG. 7), and the cooling medium in the first side wall w 1 is a bottom wall that forms the bucket 1. flows into w5.

  5 or 8, a plurality of partition walls 1d, 1e, 1f, and 1g are provided in a bottom wall w5 formed of a double wall. And the cooling medium which flowed in from the 1st side wall w1 distribute | circulates through the substantially all area | region in the bottom wall w5, and flows in into the 2nd side wall w2 which forms the bucket 1 (refer FIG. 8). The cooling medium flowing into the second side wall w2 flows out from the bottom surface side of the recess 11 toward the opening side (see FIG. 5).

  As shown in FIG. 6, the second side wall w <b> 2 communicates with the third and fourth side walls w <b> 3 and w <b> 4 on the upper side. A plurality of partition walls 1h, 1j, 1k, and 1m are provided in the third and fourth side walls w3 and w4. And the cooling medium which flowed in from the 2nd side wall w2 distribute | circulates through the substantially all area | region in each 3rd and 4th side wall w3 * w4, and flows in into the 1st side wall w1 (refer FIG. 3). Since the cooling medium flowing into the first side wall w1 is surrounded by the partition walls 1a, 1b, and 1c, it is discharged to the outer tube 22 (see FIG. 5).

  Thus, the throwing tool 10 cools the path of the inner tube 21, the first side wall w1, the bottom wall w5, the second side wall w2, the third and fourth side walls w3 and w4, the first side wall w1, and the outer tube 22. Since the medium circulates, the bucket 1 is efficiently cooled so that the residual glass raw material is reduced.

  In FIG. 1 or FIG. 2, the bucket 1 is formed of a Ni—Cr heat resistant alloy. A commercially available Ni—Cr heat-resistant alloy, for example, HA230 manufactured by Mitsubishi Materials can be used. The bucket 1 may be formed of stainless steel, for example SUS304. The arm 2 and the handle 3 are formed of SUS304. Stainless steel (SUS304) was also used for the fixing member and the reinforcing rib for welding the bucket 1 and the arm 2 and the fixing member and the reinforcing rib for welding the arm 2 and the handle 3.

  Next, the manufacturing method of the glass using the glass raw material input tool by this invention is demonstrated. In FIG. 1, the loading tool 10 has an arm 2 supported by a stand 4. The stand 4 includes a rotating shaft 41 and support legs 42. A rotating shaft 41 is rotatably connected to a support leg 42 installed on the floor surface. A U-shaped bearing that supports the arm 2 in a slidable manner is provided at the tip of the rotating shaft 41.

  In FIG. 1, the handle 3 can be grasped and the bucket 1 can be slid in the direction of X1 or X2. Further, the bucket 1 can also be swung by holding the handle 3 and using the tip of the rotating shaft 41 as a fulcrum. Furthermore, the handle 3 can be gripped and rotated around the center of rotation of the arm 2.

  In FIG. 1, in area F <b> 1, for example, a predetermined amount of glass raw material G mixed from a hopper (not shown) is accommodated in the recess 11 of the bucket 1. Next, the bucket 1 is moved to the area F2 side. A dissolution tank (not shown) is installed in the area F2, and the bucket 1 is inserted into the dissolution tank. Next, the bucket 1 is inverted and the glass raw material G is put into the melting tank. Then, the bucket 1 is pulled out from the melting tank, and the next glass raw material G is accommodated in the bucket 1. By repeating such an operation, a predetermined amount of the glass raw material G is charged into the melting tank.

  In FIG. 1, in the step of charging the glass raw material into the melting tank, the cooling medium is constantly circulated in the bucket 1, and the charging tool 10 is kept cooled to 200 ° C. or less before and after the glass raw material G is charged into the melting tank. ing. And the adhesion of the glass raw material G in the recessed part 11 is reduced by the cooling effect of the bucket 1. As a result, mixing of impurities from the throwing tool 10 into the glass is suppressed.

  Next, the result of measuring the reduction amount of batch loss due to the cooling effect of the glass raw material charging tool will be described. The batch loss amount when the bucket 1 is made to circulate cooling water inside the bucket 1 using the charging tool 10 (see FIGS. 2 to 8) formed of the Ni—Cr heat resistant alloy (HA230), and the bucket 1 The amount of batch loss when the inside of the chamber was hollow (non-water-cooled) was compared in multiple lots. The results are shown in Table 1.

  In Table 1, a total of seven tests were performed with the first to seventh lot numbers. In each lot, 359 kg of powder raw material as a glass raw material was divided into 10 times in a bucket capable of accommodating 70 liters and stored in a crucible. I put it in. Further, the batch loss amount is the total weight of the powder raw materials that have been attached to the bucket and that could not be put into the crucible in each of the 10 charging operations. As shown in the table below, lot numbers 1 to 4 used non-water-cooled buckets, and lot numbers 5 to 7 used water-cooled buckets.

  As shown in Table 1, the amount of non-water cooled batch loss from the first to the fourth round was 47.2 kg in total weight, and the average was 11.8 kg. On the other hand, the batch loss amount of water cooling from the 5th to the 6th was a total weight of 4.7 kg, and the average was 1.57 kg. As described above, by cooling the glass raw material charging tool, the batch loss amount was reduced to about 1/10 in total weight and average.

  In addition, the temperature of the supplied water is 19 ° C., the surface temperature of the bucket before and after the glass raw material is charged into the melting tank is 59 ° C., and the temperature of the discharged water is 33 ° C. there were. On the other hand, in the non-water-cooled glass raw material charging tool, the surface temperature of the bucket before and after the glass raw material was charged into the melting tank was 250 ° C to 317 ° C.

  Next, the result of having measured the influence on the transmittance | permeability of the glass for optical fibers by the cooling effect of a glass raw material insertion tool is demonstrated. The transmittance of glass obtained using a non-water-cooled glass raw material charging tool whose bucket is formed of stainless steel, and the transmittance of glass obtained using a water-cooled glass raw material charging tool whose bucket is formed of HA230 Table 2 shows the results of comparative verification. In addition, the transmission wavelength displayed in Table 2 is the transmission wavelength when the numerical value in the previous stage is 80% transmittance, and the transmission wavelength when the numerical value in the subsequent stage is 5% transmittance. The transmittance of 80% / 5% is described as the transmission wavelength, for example, 325/266 (unit: nm). And the transmittance | permeability is so good that these transmission wavelengths are short.

  Here, in Table 2, a total of three tests are performed for the mass production test product 2 and the result range is shown, and a total of two tests are performed for the mass production test product 3 and the result range is shown. The glass composition is the same for all mass production test products. However, lots are different for mass production test products 2 and 3.

  As shown in Table 2, by cooling the glass raw material charging tool, when the transmittance of the glass is 80%, the transmission wavelength is improved by about 18 nm, and when the transmittance of the glass is 5%, the transmission wavelength is 39 nm. Improved. By cooling the glass raw material charging tool, the batch loss is reduced, and it is presumed that the colored components contained in the material constituting the bucket and the glass raw material are prevented from chemically bonding at a high temperature.

  In addition, the measurement shown by Table 2 used the glass raw material insertion tool which has a bucket which can accommodate a 70 liter glass raw material using the gas melting tank of 1260 degreeC-1280 degreeC. And the transmission wavelength of the glass product obtained by water-cooling or non-water-cooling (room temperature) this glass raw material insertion tool was measured. Table 3 shows the surface temperatures of the buckets before and after charging into each melting tank of the non-water-cooled stainless steel glass raw material charging tool and the water-cooled Ni—Cr heat resistant alloy (HA230) glass raw material charging tool. It was as shown.

  As shown in Table 3, it is most preferable to keep the glass raw material charging tool cooled to 60 ° C. or less in order to improve the transmittance of the glass, and by keeping the glass raw material charging tool cooled to 100 ° C. or lower, The improvement effect is expected, and the minimum improvement effect is expected by keeping the glass raw material charging tool cooled to 200 ° C. or lower.

In the manufacturing method of the glass by this invention, it is a perspective appearance figure which shows the process of throwing a glass raw material into a melting tank using the glass raw material insertion tool of one Embodiment. It is a top view of the glass raw material input tool by the said embodiment. It is a front view of the glass raw material input tool by the said embodiment. It is a right view of the glass raw material input tool by the said embodiment. It is a longitudinal cross-sectional view of the glass raw material input tool by the said embodiment, and is AA arrow sectional drawing of FIG. It is a cross-sectional view of the glass raw material input tool by the said embodiment, and is BB arrow sectional drawing of FIG. It is a cross-sectional view of the glass raw material input tool by the said embodiment, and is CC sectional view taken on the line of FIG. It is a horizontal sectional view of the glass raw material input tool by the said embodiment, and is DD sectional view taken on the line of FIG.

Explanation of symbols

1 Bucket 2 Arm 3 Handle 10 Glass Raw Material Input Tool (Input Tool)
G Glass raw material

Claims (5)

A glass manufacturing method including a step of charging a glass raw material into a melting tank using a glass raw material input tool,
A method for producing glass in which contamination of impurities from the glass raw material charging tool to the glass is suppressed by maintaining the glass raw material charging device at 200 ° C. or lower before and after the glass raw material is charged. The glass raw material charging tool is formed with a recess for accommodating the glass raw material, and has a double wall through which a cooling medium circulates, one end side coupled to the bucket, and the other end side of the bucket around the axis. An arm for providing a handle for reversing,
The arm includes an inner pipe that is supplied with the cooling medium from the other end side and sends the cooling medium into the double wall, and surrounds the inner pipe. And an outer pipe for discharging
The bucket has a plurality of partition walls in the double wall so that the cooling medium circulates in the entire region in the double wall from the bottom surface side to the opening side of the recess.
The glass manufacturing method according to claim 1, wherein, in the step of adding the glass raw material, the bucket is cooled so that the residual glass raw material is reduced.   The glass manufacturing method according to claim 2, wherein the double wall of the bucket is made of a metal material. A glass raw material charging tool for charging glass raw material into a melting tank,
A bucket having a double wall through which a cooling medium circulates, and a recess that accommodates the glass raw material, and an arm that has a handle that is coupled to the bucket at one end side and that reverses the bucket around an axis at the other end side With
The arm includes an inner pipe that is supplied with the cooling medium from the other end side and sends the cooling medium into the double wall, and surrounds the inner pipe. And an outer pipe for discharging
The said bucket is a glass raw material input tool which has a some partition wall in the said double wall so that the said cooling medium may circulate through the whole area | region in the said double wall toward the opening side from the bottom face side of the said recessed part. The glass raw material input tool according to claim 4, wherein the double wall of the bucket is made of a metal material.

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