Device and method for manufacturing glass raw material and method for manufacturing glass article

Abstract

To suppress scattering of a glass raw material during transportation.SOLUTION: A glass raw material manufacturing device 1 includes: a chute 6a including an opening 6c for loading a glass raw material Ga by falling the glass raw material therein; a belt conveyor 7 for transporting the glass raw material Ga loaded from the chute 6a in a predetermined transportation direction X; a surrounding member 9a for surrounding a part where the glass raw material Ga loaded from the chute 6a falls; and a casing 10 for storing the belt conveyor 7 and the surrounding member 9a.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an apparatus and method for producing a glass raw material, and a method for producing a glass article. [Background technology]

[0002] 2. Description of the Related Art Various glass products, such as glass substrates used in displays such as liquid crystal displays, are manufactured by heating glass raw materials in a melting furnace to produce molten glass, and then molding the molten glass into a predetermined shape.

[0003] The glass raw material is composed of a blended powder (batch) prepared by blending a plurality of types of raw material powders in a predetermined mixing ratio.

[0004] An apparatus for producing such blended powder includes a raw material powder storage silo that stores raw material powder, a weighing silo that weighs the raw material powder supplied from the raw material powder storage silo, and a blending mixer that blends the raw material powder weighed in the weighing silo (see, for example, paragraphs 0030 to 0035 of Patent Document 1).

[0005] In this glass raw material manufacturing apparatus, the blending mixer is disposed below the weighing silo. The weighing silo and the blending mixer are connected by a supply path. The raw material powder measured in the weighing silo is supplied to the blending mixer through the supply path (see paragraphs 0034 and 0035 of the same document). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2012-25627 A Summary of the Invention [Problem to be solved by the invention]

[0007] In the conventional glass raw material manufacturing apparatus as described above, the raw material powder measured in the measuring silo is conveyed to the blending mixer through a supply path by the action of gravity.

[0008] As another configuration, instead of the above-mentioned supply path, the glass frit may be conveyed to the blending mixer by a conveying device such as a belt conveyor. In this case, when the glass frit weighed by the weighing silo is placed on the belt of the conveying device, the glass frit may scatter and leak out of the conveying device. If the glass frit leaks, it becomes difficult to blend the glass frit with high accuracy.

[0009] The present invention has been made in view of the above circumstances, and has as its technical object to suppress scattering of glass raw material during transportation. [Means for solving the problem]

[0010] (1) The present invention is intended to solve the above problems, and provides a glass frit manufacturing device comprising a chute for dropping and charging glass frit, a belt conveyor for transporting the glass frit charged from the chute in a predetermined transport direction, and a casing for housing the belt conveyor, the device further comprising an enclosure member housed in the casing and surrounding a location where the glass frit charged from the chute falls.

[0011] According to this configuration, by providing an enclosure member at the location where the glass frits fed from the chute fall, it is possible to effectively prevent the glass frits falling onto the belt conveyor from scattering, and therefore the glass frits transported by the belt conveyor can be mixed with high accuracy.

[0012] (2) In the glass raw material manufacturing apparatus described in (1) above, the enclosing member may have a ceiling portion, a side wall portion extending downward from an end of the ceiling portion in a width direction of the belt conveyor, and an opening portion provided on an end side of the ceiling portion in the conveying direction.

[0013] According to this configuration, the ceiling and side walls prevent the glass frit that has fallen onto the belt conveyor from scattering, and the glass frit can be suitably transported in the transport direction through the opening.

[0014] (3) In the glass frit manufacturing apparatus described in the above (1) or (2), the chute may include a first chute through which a large amount of the glass frit is charged and a second chute through which a small amount of the glass frit is charged, and the surrounding member may include a first surrounding member corresponding to the first chute and a second surrounding member corresponding to the second chute, and the second surrounding member may be smaller than the first surrounding member.

[0015] According to this configuration, the size of the surrounding member is determined according to the amount of glass raw material charged, so that the structure of the manufacturing apparatus can be simplified and the equipment costs can be reduced.

[0016] (4) In the glass raw material manufacturing apparatus according to any one of (1) to (3) above, a partition unit is provided to prevent leakage of the glass raw material from an end of the belt conveyor in the width direction to the outside, and the partition unit may include a first partition unit provided at one end side of the belt conveyor in the width direction, and a second partition unit provided at the other end side of the belt conveyor in the width direction.

[0017] According to this configuration, the partition can prevent the glass raw material from leaking out of the belt conveyor, and the glass raw material can be mixed with high accuracy after transportation.

[0018] (5) In the glass raw material manufacturing apparatus described in the above (4), the surrounding member may be disposed between the first partition part and the second partition part.

[0019] According to this configuration, scattering and leakage of the glass raw material transported by the belt conveyor can be prevented by the surrounding member and the partition, so that the glass raw material can be mixed more accurately after transportation.

[0020] (6) In the glass raw material manufacturing apparatus according to any one of the above (1) to (5), the belt conveyor has a conveying surface for receiving the glass raw material fed from the chute, and the conveying surface may have a concave cross-sectional shape.

[0021] According to this configuration, by forming the conveying surface of the belt conveyor in a concave shape, it is possible to suppress leakage of glass raw material on the conveying surface from the belt conveyor.

[0022] (7) A method for producing a glass frit according to the present invention is for solving the above-mentioned problems, and is characterized in that it comprises a conveying step of conveying the glass frit by the belt conveyor in the glass frit producing apparatus according to any one of (1) to (6) above.

[0023] According to this configuration, the glass frit is transported by the glass frit manufacturing device, so that the scattering of the glass frit can be effectively suppressed. Therefore, the glass frit can be mixed accurately after the transporting step.

[0024] (8) The method for producing a glass article according to the present invention is intended to solve the above-mentioned problems, and is characterized in that a glass article is produced by using a glass frit produced by the method for producing a glass frit according to the above-mentioned (7).

[0025] According to this configuration, the glass raw materials can be precisely mixed after the transport step, thereby producing a high-quality glass article. Effect of the Invention

[0026] According to the present invention, scattering of glass raw material during transportation can be suppressed. [Brief description of the drawings]

[0027] [Figure 1] FIG. 2 is a side cross-sectional view showing a glass raw material manufacturing apparatus. [Diagram 2] 2 is a cross-sectional view taken along the line II-II of FIG. 1. [Diagram 3] FIG. 2 is a perspective view showing the chute and the surrounding member. [Figure 4] 1 is a flowchart showing a method for manufacturing a glass article. [Diagram 5] 1 is a flowchart showing a compounding process. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0028] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Figures 1 to 5 show an embodiment of a glass material manufacturing apparatus and manufacturing method, and a glass article manufacturing method according to the present invention.

[0029] As shown in FIG. 1 and FIG. 2, the glass frit manufacturing apparatus 1 mainly includes: supplying devices 2a, 2b for supplying powdered glass frits Ga, Gb; and conveying device 3 for conveying the glass frits Ga, Gb supplied from the supplying devices 2a, 2b along a predetermined conveying direction X.

[0030] The supplying device 2a, 2b includes the first supplying device 2a that supplies the first frit Ga and the second supplying device 2b that supplies the second frit Gb. In this embodiment, the supplying amount of the first frit Ga by the first supplying device 2a is set to be larger than the supplying amount of the second frit Gb by the second supplying device 2b, but the setting of the supplying amount of frit Ga, Gb is not limited to this embodiment.

[0031] The supplying devices 2a and 2b each include a hopper 4, a feeder 5 connected to the hopper 4, and chutes 6a and 6b connected to the feeder 5.

[0032] The hopper 4 guides predetermined weights of glass raw materials Ga and Gb supplied from a silo (not shown) to the feeder 5. The hopper 4 is connected to one end of the feeder 5.

[0033] The feeder 5 transfers the glass frits Ga and Gb supplied from the hopper 4 to the chutes 6a and 6b. The feeder 5 is, for example, a vibration feeder, but is not limited to this configuration and may be a screw feeder, a belt conveyor, or the like.

[0034] The chutes 6a and 6b include a first chute 6a provided in the first supply device 2a and a second chute 6b provided in the second supply device 2b. Each of the chutes 6a and 6b is configured as a tube extending in the vertical direction, but is not limited to this configuration. The tube diameter (inner diameter) D1 of the first chute 6a is larger than the tube diameter (inner diameter) D2 of the second chute 6b. This makes it possible to make the amount of the first glass frit Ga fed by the first chute 6a per unit time larger than the amount of the second glass frit Gb fed by the second chute 6b per unit time.

[0035] The chutes 6a and 6b are connected to the other end of the feeder 5. The chutes 6a and 6b have an opening 6c through which the glass raw materials Ga and Gb transported by the feeder 5 are dropped downward and input into the conveying device 3. The upper ends of the chutes 6a and 6b are connected to the feeder 5, and the lower ends of the chutes 6a and 6b are fixed to the upper part of the conveying device 3.

[0036] The conveying device 3 includes a belt conveyor 7 that conveys the glass frits Ga, Gb fed from the chutes 6a, 6b along a conveying direction X, partitions 8a, 8b that prevent the glass frits Ga, Gb from leaking outward from ends of the belt conveyor 7 in a width direction W (horizontal direction perpendicular to the conveying direction X), enclosure members 9a, 9b provided in the vicinity of the chutes 6a, 6b, and a casing 10 that houses the belt conveyor 7, the partitions 8a, 8b, and the enclosure members 9a, 9b.

[0037] The belt conveyor 7 includes an endless belt 11 and a plurality of rollers 12 to 14 that support the belt 11.

[0038] The belt 11 is configured to convey the glass frits Ga and Gb along their longitudinal direction, i.e., along the conveying direction X, by a driving device (not shown). The belt 11 has a conveying surface 11a that receives the glass frits Ga and Gb input from the openings 6c of the chutes 6a and 6b. As shown in FIG. 2, the conveying surface 11a is configured to have a concave cross-sectional shape. That is, the conveying surface 11a has a central portion in the width direction W lower than the ends in the width direction W.

[0039] 2, rollers 12 to 14 include a first roller 12, a second roller 13, and a third roller 14 arranged along the width direction W of belt 11. The first roller 12 supports the underside of belt 11 at the center in the width direction W. The second roller 13 supports the underside of belt 11 at one end in the width direction W. The third roller 14 supports the underside of belt 11 at the other end in the width direction W.

[0040] The first roller 12 is disposed so that its rotation axis is aligned with the width direction W (horizontal direction) of the belt 11. The second roller 13 and the third roller 14 are disposed so that their rotation axes are inclined with respect to the width direction W (horizontal direction) of the belt 11. By supporting the belt 11 in an inclined state with the second roller 13 and the third roller 14, the conveying surface 11a of the belt 11 can be configured to have a concave shape.

[0041] As shown in Figure 2, the partitions 8a, 8b include a first partition 8a provided at one end side in the width direction W of the belt conveyor 7, and a second partition 8b provided at the other end side in the width direction W of the belt conveyor 7.

[0042] Each of the partitions 8a, 8b is made of an elastic material such as rubber, but the material of each of the partitions 8a, 8b is not limited to this embodiment. The upper end of each of the partitions 8a, 8b is fixed to the casing 10 by a fixing member 8c. The lower end of each of the partitions 8a, 8b is in contact with the conveying surface 11a of the belt 11 of the belt conveyor 7 while being elastically deformed.

[0043] Each of the partitions 8a, 8b is configured to be elongated along the conveying direction X. The partitions 8a, 8b extend in the longitudinal direction of the belt 11 of the belt conveyor 7. With this configuration, a space (conveying space) for conveying the glass raw materials Ga, Gb is formed between the first partition 8a and the second partition 8b.

[0044] The surrounding members 9a and 9b are for suppressing scattering of the glass frits Ga and Gb when they are fed from the chutes 6a and 6b to the belt 11 and collide with the belt 11. The surrounding members 9a and 9b are made of metal or resin, but are not limited to these materials. The surrounding members 9a and 9b surround the area where the glass frits Ga and Gb fed from the openings 6c of the chutes 6a and 6b fall. The surrounding members 9a and 9b are disposed between the first partition section 8a and the second partition section 8b.

[0045] The surrounding members 9a, 9b include a first surrounding member 9a provided on the first chute 6a and a second surrounding member 9b provided on the second chute 6b. As shown in Figures 1 to 3, the surrounding members 9a, 9b have a ceiling portion 15, side wall portions 16a, 16b extending downward from the end of the ceiling portion 15 in the width direction W of the belt conveyor 7, and openings 17a, 17b provided on the end side of the ceiling portion 15 in the conveying direction X.

[0046] The size of the surrounding members 9a, 9b is determined according to the amount of frit Ga, Gb charged from each chute 6a, 6b per unit time, and the surrounding members 9a, 9b are configured to become smaller as the amount of frit Gb charged per unit time decreases. In this embodiment, since the amount of the second frit Gb charged by the second chute 6b is smaller than the amount of the first frit Ga charged by the first chute 6a, the second surrounding member 9b is configured to be smaller than the first surrounding member 9a.

[0047] Specifically, the length dimension L2 of the side wall portions 16a, 16b of the second enclosing member 9b in the conveying direction X is smaller than the length dimension L1 of the side wall portions 16a, 16b of the first enclosing member 9a in the conveying direction X. The dimension W2 of the ceiling portion 15 of the second enclosing member 9b in the width direction W is equal to the dimension W1 of the ceiling portion 15 of the first enclosing member 9a in the width direction W.

[0048] The ceiling portion 15 is a plate-like portion extending in the horizontal direction. The ceiling portion 15 is fixed to the casing 10. The ceiling portion 15 has a through hole 15a through which the glass raw materials Ga and Gb falling through the chutes 6a and 6b pass. The ceiling portion 15 is connected to the lower end of the chutes 6a and 6b so that the through hole 15a coincides with the opening 6c of the chutes 6a and 6b.

[0049] The side walls 16a, 16b include a first side wall 16a protruding downward from one end of the ceiling 15 in the width direction W, and a second side wall 16b protruding downward from the other end of the ceiling 15 in the width direction W. The first side wall 16a and the second side wall 16b are spaced apart in the width direction W and face each other.

[0050] The length dimensions L1, L2 of the side walls 16a, 16b in the conveying direction X are preferably 1.1 to 5 times, and more preferably 1.1 to 3 times, the pipe diameters D1, D2 of the corresponding chutes 6a, 6b.

[0051] The lower end of each of the side walls 16a, 16b does not contact the conveying surface 11a of the belt 11 in the belt conveyor 7. The distance between the lower end of each of the side walls 16a, 16b and the conveying surface 11a is preferably, for example, 30 mm or more and 90 mm or less. This makes it possible to prevent wear due to contact between each of the side walls 16a, 16b and the conveying surface 11a.

[0052] The openings 17a, 17b of the enclosing members 9a, 9b include an upstream opening 17a provided on the upstream side in the conveying direction X and a downstream opening 17b provided on the downstream side in the conveying direction X. The openings 17a, 17b of the second enclosing member 9b are smaller than the openings 17a, 17b of the first enclosing member 9a.

[0053] The casing 10 has an upper wall portion 10a supporting each chute 6a, 6b, a pair of side wall portions 10b, 10c extending downward from the ends of the upper wall portion 10a in the width direction W, and a lower wall portion 10d connecting the lower ends of the pair of side wall portions 10b, 10c.

[0054] The upper wall 10a of the casing 10 supports the ceiling 15 of the surrounding members 9a and 9b. The ceiling 15 of the surrounding members 9a and 9b is fixed to the inner surface of the upper wall 10a by fixing members such as bolts. The upper wall 10a has through holes 10a1 through which the lower ends of the chutes 6a and 6b are inserted.

[0055] The side walls 10b, 10c of the casing 10 include a first side wall 10b located on one end side of the belt 11 in the width direction W, and a second side wall 10c located on the other end side of the belt 11 in the width direction W. The first side wall 10b is located outside the first partition portion 8a and covers the first partition portion 8a. The second side wall 10c is located outside the second partition portion 8b and covers the second partition portion 8b.

[0056] The bottom wall portion 10d of the casing 10 connects the bottom end of the first side wall portion 10b and the bottom end of the second side wall portion 10c. The bottom wall portion 10d is located below the belt conveyor 7 and covers the belt conveyor 7.

[0057] Hereinafter, a method for producing a mixed glass frit by mixing the first glass frit Ga and the second glass frit Gb using the above-mentioned production apparatus 1, and a method for producing a glass article using the mixed glass frit will be described.

[0058] As shown in FIG. 4, the method for manufacturing a glass article mainly includes a preparation step S1, a melting step S2, and a molding step S3.

[0059] The blending step S1 is a step of producing a mixed glass raw material using a production apparatus 1. As shown in Fig. 5, the blending step S1 includes an input step S11, a transport step S12, a mixing step S13, and a filling step S14.

[0060] In the charging step S11, the first frit Ga is supplied from the first supply device 2a to the conveying device 3, and the second frit Gb is supplied from the second supply device 2b to the conveying device 3. In the charging step S11, each frit Ga, Gb is supplied from the silo to the hopper 4. A weighing device is provided on the path from the silo to the hopper 4. Therefore, the frit Ga, Gb of a measured predetermined weight is supplied to the hopper 4. As the frit Ga, Gb, for example, silica sand, limestone, soda ash, cullet, etc. can be used.

[0061] Then, each of the glass frits Ga and Gb is transferred from the hopper 4 to the feeder 5 and the chutes 6a and 6b. Further, the glass frits Ga and Gb fall onto the belt conveyor 7 of the conveying device 3 from the openings 6c of the chutes 6a and 6b.

[0062] More specifically, the frits Ga and Gb that have passed through the openings 6c of the chutes 6a and 6b pass through the through holes 15a of the ceiling 15 of the enclosing members 9a and 9b and fall onto the conveying surface 11a of the belt 11 of the belt conveyor 7. At this time, the frits Ga and Gb collide with the conveying surface 11a to scatter, but the ceiling 15 and side walls 16a and 16b of the enclosing members 9a and 9b can suppress this scattering as much as possible.

[0063] In the conveying step S12, the glass frits Ga and Gb are conveyed by the conveying device 3. The conveying device 3 continuously drives the belt 11, and the glass frits Ga and Gb placed on the conveying surface 11a are conveyed downstream in the conveying direction X.

[0064] In the mixing step S13, the glass frits Ga and Gb are mixed by a mixer arranged downstream in the conveying direction X of the conveying device 3. This produces a mixed glass frit in which the first glass frit Ga and the second glass frit Gb are mixed.

[0065] In the filling step S14, the mixed glass raw material produced in the mixing step S13 is filled into a container. The container filled with the mixed glass raw material is transferred to the melting step S2.

[0066] In the melting step S2, the mixed glass raw materials filled in the container are taken out and supplied to a melting furnace which performs the melting step S2. The melting furnace includes a feeder for transporting the mixed glass raw materials and a melting tank for melting the mixed glass raw materials.

[0067] In the melting step S2, the mixed glass raw materials are transported by a feeder and supplied to a melting tank. The melting tank heats the mixed glass raw materials to produce molten glass. The molten glass produced in the melting tank is transported to the forming step S3 via a predetermined transport path (transport step).

[0068] The transfer path is provided with a fining tank, a stirring tank, a conditioning tank, etc. The molten glass is degassed in the fining tank, and then homogenized by stirring in the stirring tank. The molten glass is then adjusted in viscosity and other properties in the conditioning tank, and is then supplied to the forming step S3.

[0069] In the forming step S3, the molten glass is formed by a forming device that performs, for example, an overflow downdraw method. The forming device includes a forming body that can form the molten glass into a glass ribbon as a glass article.

[0070] In the forming process S3, molten glass is poured into an overflow groove provided on the upper part of a forming body having a substantially wedge-shaped cross section, and the molten glass overflowing from this overflow groove is allowed to flow down along both side surfaces of the forming body while being fused and integrated at the lower end of the forming body, thereby continuously forming a glass ribbon.

[0071] Next, the glass ribbon is cooled through an annealing step and a cooling step. Thereafter, the glass ribbon may be cut, for example, through a first cutting step. As a result, a sheet-shaped glass plate is formed. The glass plate is manufactured through a second cutting step, an edge processing step, a cleaning step, an inspection step, and the like. The glass plate as a glass article manufactured in this manner is suitably used as, for example, a glass substrate for a display such as a liquid crystal display. Not limited thereto, the glass ribbon may be wound into a roll without being cut. As a result, a glass roll as a glass article is manufactured.

[0072] According to the above-described glass frit manufacturing apparatus 1 and manufacturing method, and glass article manufacturing method according to the present embodiment, by providing the surrounding members 9a, 9b at the places where the glass frits Ga, Gb fall from the openings 6c of the chutes 6a, 6b of the manufacturing apparatus 1, it is possible to suppress scattering of the glass frits Ga, Gb as much as possible when they fall onto the conveying surface 11a of the belt conveyor 7. This makes it possible to manufacture a mixed glass frit with high accuracy and to manufacture a high-quality glass article.

[0073] The present invention is not limited to the configuration of the above embodiment, nor is it limited to the above-mentioned effects and advantages. Various modifications of the present invention are possible without departing from the spirit and scope of the present invention.

[0074] In the above embodiment, the lower ends of the side wall portions 16a, 16b of the enclosing members 9a, 9b are separated from the conveying surface 11a of the belt conveyor 7, but the present invention is not limited to this configuration. For example, the side wall portions 16a, 16b of the enclosing members 9a, 9b may be made of an elastic material such as rubber, and the lower ends of the side wall portions 16a, 16b may be brought into contact with the conveying surface 11a in an elastically deformed state.

[0075] In the above embodiment, the glass raw material manufacturing apparatus 1 having two supply devices 2a and 2b is illustrated, but the present invention is not limited to this configuration. The manufacturing apparatus 1 may have one supply device or three or more supply devices.

[0076] In the above embodiment, the manufacturing apparatus 1 is exemplified in which the conveying surface 11a of the belt conveyor 7 in the conveying device 3 is configured to be concave, but the present invention is not limited to this configuration. The conveying surface 11a of the belt conveyor 7 may be configured to be flat.

[0077] In the above embodiment, the enclosing members 9a, 9b are provided with the ceiling portion 15 and the pair of side walls 16a, 16b, but the present invention is not limited to this configuration. For example, the enclosing members 9a, 9b may be configured by omitting the ceiling portion 15 and fixing the upper ends of the side walls 16a, 16b to the upper wall portion 10a of the casing 10. [Explanation of symbols]

[0078] 1. Glass raw material manufacturing equipment 6a First shot 6b Second shot 7. Conveyor Belt 8a First partition 8b Second partition 9a First enclosing member 9b Second enclosure member 10 Casing 11a Conveying surface 15 Ceiling of enclosure 16a: first side wall portion of the enclosing member 16b Second side wall portion of the enclosing member 17a Upstream opening of enclosure 17b Downstream opening of enclosure Ga First glass raw material Gb Second glass raw material S12 Transportation process W Belt conveyor width direction X conveying direction

Claims

1. A glass frit manufacturing apparatus comprising: a chute for dropping and charging glass frits; a belt conveyor for conveying the glass frits charged from the chute in a predetermined conveying direction; and a casing for accommodating the belt conveyor, 2. The glass frit manufacturing apparatus according to claim 1, further comprising: a surrounding member that is accommodated in the casing and surrounds a portion into which the glass frit charged from the chute falls.

2. 2. The glass raw material manufacturing apparatus according to claim 1, wherein the surrounding member has a ceiling portion, a side wall portion extending downward from an end portion of the ceiling portion in a width direction of the belt conveyor, and an opening portion provided on an end side of the ceiling portion in the conveying direction.

3. The chute includes a first chute having a large amount of the glass frit charged therein and a second chute having a small amount of the glass frit charged therein; The surrounding member includes a first surrounding member corresponding to the first chute and a second surrounding member corresponding to the second chute, The apparatus for producing a glass raw material according to claim 1 or 2, wherein the second enclosing member is smaller than the first enclosing member.

4. a partition portion for preventing leakage of the glass raw material outward from an end portion in a width direction of the belt conveyor, 3. The glass raw material manufacturing apparatus according to claim 1, wherein the partitioning section includes a first partitioning section provided at one end side in the width direction of the belt conveyor, and a second partitioning section provided at the other end side in the width direction of the belt conveyor.

5. The apparatus for producing a glass raw material according to claim 4, wherein the surrounding member is disposed between the first partition part and the second partition part.

6. The belt conveyor has a conveying surface for receiving the glass raw material introduced from the chute, 3. The apparatus for producing a glass raw material according to claim 1, wherein the conveying surface has a concave cross-sectional shape.

7. A method for producing a glass frit, comprising: a conveying step of conveying the glass frit by the belt conveyor in the glass frit producing apparatus according to claim 1 or 2.

8. A method for producing a glass article, comprising producing a glass article by using a glass frit produced by the method for producing a glass frit according to claim 7.

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