JP6582682B2 - Glass article manufacturing apparatus and glass article manufacturing method - Google Patents

Description

  The present invention relates to a glass article manufacturing apparatus and a glass article manufacturing method.

  2. Description of the Related Art Conventionally, a glass article that includes a forming section that forms molten glass and forms a glass ribbon, and a sandwiching section that sandwiches the glass ribbon with a first roller and a second roller, and conveys the glass ribbon to produce a glass article. Is known (see, for example, Patent Document 1). As a shaping | molding part, the shaping | molding part which shape | molds a glass ribbon by down-draw methods, such as an overflow down-draw method, is mentioned, for example. The sandwiching portion is provided for pulling the glass ribbon downward or regulating the shape of the glass ribbon.

JP 2007-051028 A

  In a glass article manufacturing apparatus, a forming part for forming a glass ribbon and a holding part for holding the glass ribbon are managed so as to have an appropriate temperature distribution by being surrounded by a heat insulating wall. Thereby, the quality of the glass ribbon is easily stabilized, and the quality of the glass article is easily stabilized. In such a glass article manufacturing apparatus, the rollers constituting the sandwiching section also affect the quality, such as the shape and physical properties of the glass article to be obtained. Therefore, it is important to confirm the appearance of the rollers that sandwich the glass ribbon being conveyed in order to maintain the quality of the glass article.

  An object of the present invention is to provide a glass article manufacturing apparatus and a glass article manufacturing method capable of suppressing the influence on the quality of the glass ribbon when confirming the appearance state of a roller for sandwiching the glass ribbon being conveyed. It is in.

  An apparatus for manufacturing a glass article that solves the above problems includes a molding unit that flows molten glass to form a glass ribbon, a sandwiching unit that sandwiches the glass ribbon between a first roller and a second roller, the molding unit, and A glass article manufacturing apparatus that conveys the glass ribbon and manufactures a glass article, wherein at least one of the first roller and the second roller is connected to the heat insulating wall. The visual recognition part is provided so as to be visible from the outside, and the visual recognition part has a through hole that penetrates the heat insulating wall and a closing member that closes the through hole.

  According to this structure, it becomes possible to visually recognize a roller through the visual recognition part from the outside of a heat insulation wall during conveyance of a glass ribbon. Here, even when the opening of the through hole penetrating the heat insulating wall is opened, it is possible to visually recognize the roller through the through hole during the conveyance of the glass ribbon. However, in this case, outside air tends to flow into the inside of the heat insulating wall, and the temperature inside the heat insulating wall may become unstable, or the glass ribbon being conveyed may swing due to the outside air flowing in. That is, when the opening of the through hole is opened, the quality of the glass ribbon is easily affected. On the other hand, since the visual recognition part of the said manufacturing apparatus has the obstruction | occlusion member which obstruct | occludes the through-hole which penetrates a heat insulation wall, it is hard to flow in external air from a visual recognition part inside a heat insulation wall.

In the apparatus for manufacturing a glass article, it is preferable that the visual recognition unit is provided so that any of the first roller, the second roller, and the glass ribbon can be visually recognized.
According to this structure, in addition to the 1st roller and the 2nd roller, the process management which considered the state of the glass ribbon of the clamping part vicinity can also be performed by visually recognizing a glass ribbon.

  In the glass article manufacturing apparatus, a drive unit that rotationally drives the first roller and the second roller is provided outside the heat insulating wall, and the drive unit is a first drive unit that rotationally drives the first roller. And a second drive unit that rotationally drives the second roller, and the visual recognition unit is between the first drive unit and the second drive unit, the first roller, the second roller, and It is preferable that any of the glass ribbons is provided so as to be visible.

  According to this structure, in addition to the 1st roller and the 2nd roller, the process management which considered the state of the glass ribbon of the clamping part vicinity can also be performed by visually recognizing a glass ribbon. Moreover, the 1st roller and the 2nd roller can be visually recognized from a closer position.

In the glass article manufacturing apparatus, it is preferable that the visual recognition unit includes a closing member provided as a closing member that protrudes outward from the outer surface of the heat insulating wall.
According to this configuration, since the inflow of outside air is suppressed at a location further away from the glass ribbon, the temperature around the glass ribbon is easily stabilized.

In the glass article manufacturing apparatus, it is preferable that the visual recognition unit includes a closing member provided as the closing member so that the opening of the through hole can be opened and closed.
According to this configuration, it is possible to temporarily open the opening of the through hole and improve the state of the roller disposed inside the heat insulating wall through the through hole.

A method for manufacturing a glass article that solves the above-described problems produces a glass article using the glass article manufacturing apparatus.
According to this method, process management during manufacture of the glass article is facilitated.

  ADVANTAGE OF THE INVENTION According to this invention, when confirming the external appearance state of the roller which clamps the glass ribbon in conveyance, the influence on the quality of a glass ribbon can be suppressed.

It is the fragmentary sectional view which looked at the manufacturing apparatus of the glass article in embodiment from the front. (A) is the fragmentary sectional view which looked at the manufacturing apparatus of glass articles from the side, (b) is an enlarged view which expands and shows the principal part.

  Hereinafter, embodiments of a glass article manufacturing apparatus and a glass article manufacturing method will be described with reference to the drawings. Note that in the drawings, for convenience of explanation, some components may be exaggerated or simplified. Further, the dimensional ratio of each part may be different from the actual one.

  As shown in FIG.1 and FIG.2 (a), the manufacturing apparatus 11 of the glass article flows down the molten glass MG, the shaping | molding part 12 which shape | molds the glass ribbon G, the 1st roller R1, and the 2nd glass ribbon G. A clamping unit 13 that is clamped by the roller R2 is provided. The glass article manufacturing apparatus 11 further includes a heat insulating wall 14 that surrounds the forming portion 12 and the sandwiching portion 13.

In the present embodiment, as an example of the forming unit 12, a forming unit 12 that forms the glass ribbon G using an overflow downdraw method, which is a kind of downdraw method, is shown.
As shown in FIG. 2A, the molding unit 12 in the glass article manufacturing apparatus 11 includes a groove 12a that overflows the molten glass MG, a first guide surface 12b that guides the flow of the overflowed molten glass MG, and a second one. And a guide surface 12c. The second guide surface 12c is located on the opposite side of the first guide surface 12b, and the molten glass MG flowing down along the first guide surface 12b and the second guide surface 12c is fused at the lower end of the molding portion 12. Thus, the glass ribbon G is formed. In addition, although illustration is abbreviate | omitted to the shaping | molding part 12, the supply tube which supplies molten glass MG is connected, and molten glass MG is supplied continuously.

  In addition, as the shaping | molding part 12, the shaping | molding part which flows down and shape | molds the molten glass MG can be applied, and the shaping | molding part which shape | molds the glass ribbon G using down-draw methods other than the overflow down-draw method mentioned above It can also be changed. Examples of the downdraw method other than the overflow downdraw method include a slot downdraw method and a redraw method.

  As shown in FIGS. 1 and 2A, the glass article manufacturing apparatus 11 includes a plurality of sandwiching portions 13 that are spaced apart from each other in the transport direction Y below the forming portion 12. Each clamping part 13 is arrange | positioned so that the one end side part in the width direction X of the glass ribbon G and the other end side part may be clamped by 1st roller R1 and 2nd roller R2, respectively.

  The glass article manufacturing apparatus 11 includes a drive unit that rotationally drives the first roller R <b> 1 and the second roller R <b> 2 of the clamping unit 13 outside the heat insulating wall 14. The drive unit includes a first drive unit D1 that rotationally drives the first roller R1, and a second drive unit D2 that rotationally drives the second roller R2. Thus, the 1st drive part D1 which is an independent drive part, and the 2nd drive part D2 are spaced apart and arrange | positioned in the thickness direction of the glass ribbon G. FIG. The drive unit includes, for example, a motor.

  In this embodiment, in each clamping part 13, roller R1a which clamps the one end side part in the width direction X of the glass ribbon G, and roller R1b which clamps the other end side part in the width direction X are independent rotating shafts. Is rotated respectively.

  In addition, the glass article manufacturing apparatus 11 may include a sandwiching unit configured by a so-called free roller that is driven by the glass ribbon G being conveyed. In addition, as a configuration in which a roller R1a that sandwiches one end portion in the width direction X of the glass ribbon G and a roller R1b that sandwiches the other end portion in the width direction X are connected and rotated by a common rotating shaft. Also good.

  The glass article manufacturing apparatus 11 includes a visual recognition unit 15 provided so that the rollers (the first roller R1 and the second roller R2) constituting the sandwiching unit 13 are visible from the outside of the heat insulating wall 14.

  As shown in FIGS. 2A and 2B, the visual recognition unit 15 in the glass article manufacturing apparatus 11 includes a first roller R1 and a second roller between the first drive unit D1 and the second drive unit D2. The roller R2 and the glass ribbon G are provided so as to be visible.

  Here, the heat insulation wall 14 will be described in detail. The heat insulation wall 14 includes a front wall 14a and a back wall 14b provided along the surface of the glass ribbon G, and a pair of side walls provided along the thickness direction of the glass ribbon G. 14c and a ceiling wall 14d to be a ceiling portion. Examples of the cross-sectional structure of the heat insulating wall 14 include a structure in which a heat insulating material is disposed between a pair of metal plates. The inside surrounded by such a heat insulating wall 14 cannot be visually recognized through the heat insulating wall 14. The front wall 14a and the back wall 14b of the heat insulation wall 14 are equipped with a heating mechanism for adjusting the temperature inside the heat insulation wall 14 as necessary.

  The visual recognition unit 15 includes a through hole 16 that penetrates the side wall 14 c of the heat insulating wall 14 and a closing member 17 that closes the through hole 16. The dimension of the through hole 16 is preferably larger from the viewpoint of enhancing the visibility of the rollers of the sandwiching portion 13, but is preferably smaller from the viewpoint of ensuring the heat insulating property of the heat insulating wall 14. The through hole 16 preferably has a shape extending in the thickness direction of the glass ribbon G.

  As shown in FIG. 2A, the width dimension W1 of the through-hole 16 is preferably 10% or more, more preferably 20%, when the width dimension W2 in the inner dimension of the side wall 14c is 100%. That's it. Similarly, the width dimension W1 of the through hole 16 is preferably 80% or less, more preferably 70% or less, where the width dimension W2 in the inner dimension of the side wall 14c is 100%.

  The height dimension H1 of the through hole 16 is preferably 10% or more, more preferably 20% or more, where the width dimension W1 of the through hole 16 is 100%. Further, the height dimension H1 of the through hole 16 is preferably 90% or less, more preferably 80% or less when the width dimension W1 of the through hole 16 is 100%.

  The closing member 17 of the visual recognition unit 15 is provided to protrude outward from the outer surface of the heat insulating wall 14. The closing member 17 is provided so that the opening of the through hole 16 can be opened and closed. For example, the closing member 17 is fixed to the heat insulating wall 14 by a fixing member that can be attached to and detached from the heat insulating wall 14, and the opening of the through hole 16 is opened by removing the closing member 17 together with the fixing member. Further, by attaching the closing member 17 to the heat insulating wall 14 via a hinge mechanism, the opening of the through hole 16 can be configured to be opened and closed by rotating the closing member 17.

  As shown in FIG. 2B, the closing member 17 includes a frame body 17 a and a translucent member 17 b that is attached to the frame body 17 a and has a size equal to or larger than the opening of the through hole 16. The frame body 17a is made of, for example, metal, and the translucent member 17b is made of a heat-resistant material that can withstand the temperature of the air in contact with the frame body 17a. As the translucent member 17b, it is preferable to use heat-resistant glass (crystallized glass). The blocking member 17 may include a light transmissive member 17b having a multilayer glass structure from the viewpoint of improving heat insulation. In addition, the frame 17a of the closing member 17 may be omitted, and the closing member 17 may be configured only from the light transmitting member 17b. Further, a sealing member that surrounds the opening of the through hole 16 may be provided between the heat insulating wall 14 (side wall 14 c) and the closing member 17. Note that the above is an example, and the size of the translucent member 17 b may be smaller than the opening of the through hole 16.

  The method for manufacturing a glass article using the glass article manufacturing apparatus 11 includes a glass ribbon G forming step and a glass ribbon G slow cooling step. The slow cooling step is a step of reducing the internal distortion of the glass ribbon G while conveying the glass ribbon G downward. The forming process of the glass ribbon G and the slow cooling process of the glass ribbon G are performed in a portion surrounded by the heat insulating wall 14. The glass ribbon G carried out from the heat insulating wall 14 is cooled to a temperature near room temperature, and then cut into a predetermined size. Thereby, the plate glass as a glass article is obtained continuously.

Next, main actions of the glass article manufacturing apparatus 11 will be described.
In the forming unit 12 of the glass article manufacturing apparatus 11, the glass ribbon G is formed by flowing the molten glass MG. The formed glass ribbon G is clamped by the clamping unit 13 and pulled downward. The inside of the heat insulating wall 14 is managed so as to have a temperature distribution appropriate for the forming and slow cooling of the glass ribbon G.

  The glass article manufacturing apparatus 11 described above includes the visual recognition unit 15 provided so that the rollers (the first roller R1 and the second roller R2) of the clamping unit 13 are visible from the outside of the heat insulating wall 14 (side wall 14c). Yes. According to this configuration, it is possible to visually recognize the roller through the visual recognition unit 15 from the outside of the heat insulating wall 14 during the conveyance of the glass ribbon G, as shown by the broken line in the portion visible in FIG. . Here, even when the opening of the through hole 16 penetrating the heat insulating wall 14 is opened, the roller can be visually recognized through the through hole 16 during the conveyance of the glass ribbon G. However, in this case, the outside air tends to flow into the inner side of the heat insulating wall 14, and the temperature inside the heat insulating wall 14 may become unstable, or the glass ribbon G being transported may oscillate due to the flowing out air. There is. That is, if the opening of the through hole 16 is opened, the quality of the glass ribbon G is easily affected. On the other hand, since the visual recognition part 15 in the said glass article manufacturing apparatus 11 has the closure member 17 which obstruct | occludes the through-hole 16 which penetrates the heat insulation wall 14 (side wall 14c), it is more than the heat insulation wall 14 from the visual recognition part 15. Outside air is hard to flow inside.

  Further, the closing member 17 of the visual recognition unit 15 of the present embodiment is provided to protrude outward from the outer surface of the heat insulating wall 14 (side wall 14c). In this case, since the inflow of outside air is suppressed at a location further away from the glass ribbon G, the temperature around the glass ribbon G is likely to be stabilized.

  In the glass article manufacturing apparatus 11 of the present embodiment, the visual recognition unit 15 can visually recognize any of the first roller R1, the second roller R2, and the glass ribbon G from between the first drive unit D1 and the second drive unit D2. Is provided. In this case, by visually checking the glass ribbon G in addition to the first roller R1 and the second roller R2, process management considering the state of the glass ribbon G in the vicinity of the sandwiching portion 13 can be performed. Further, the first roller R1 and the second roller R2 can be viewed from a closer position.

  The closing member 17 in the visual recognition unit 15 of the present embodiment can open and close the opening in the through hole 16 that penetrates the heat insulating wall 14. In this case, it is possible to temporarily open the opening of the through hole 16 and improve the state of the roller disposed inside the heat insulating wall 14 through the through hole 16. For example, when foreign matter is attached to the outer peripheral surface of the roller viewed through the visual recognition unit 15, the opening in the through hole 16 is temporarily opened, and the foreign matter attached to the outer peripheral surface of the roller is removed through the through hole 16. It is also possible to do.

According to the embodiment described in detail above, the following operational effects are exhibited.
(1) The glass article manufacturing apparatus 11 includes a forming unit 12 that flows the molten glass MG and forms the glass ribbon G, and a sandwiching unit 13 that sandwiches the glass ribbon G between the first roller R1 and the second roller R2. And a heat insulating wall 14 surrounding the forming portion 12 and the sandwiching portion 13. The glass article manufacturing apparatus 11 transports the glass ribbon G to manufacture a glass article. The glass article manufacturing apparatus 11 includes a visual recognition unit 15 provided so that at least one of the first roller R1 and the second roller R2 can be visually recognized from the outside of the heat insulating wall 14. The visual recognition unit 15 includes a through hole 16 that penetrates the heat insulating wall 14 and a closing member 17 that closes the through hole 16.

  According to this configuration, the roller can be visually recognized through the visual recognition unit 15 from the outside of the heat insulating wall 14 during the conveyance of the glass ribbon G. Moreover, since the visual recognition part 15 of the said glass article manufacturing apparatus 11 has the obstruction | occlusion member 17 which obstruct | occludes the through-hole 16 which penetrates the heat insulation wall 14, external air does not flow easily into the inner side rather than the heat insulation wall 14 from the visual recognition part 15. . Therefore, the influence on the quality of the glass ribbon G can be suppressed when confirming the appearance of the roller that sandwiches the glass ribbon G being conveyed.

  (2) In the glass article manufacturing apparatus 11, the visual recognition unit 15 is provided so that any of the first roller R 1, the second roller R 2, and the glass ribbon G can be visually recognized. In this case, by visually checking the glass ribbon G in addition to the first roller R1 and the second roller R2, process management considering the state of the glass ribbon G in the vicinity of the sandwiching portion 13 can be performed. Thereby, for example, in the glass article manufacturing apparatus 11, it is easy to identify a place where improvement is required and to determine the necessity of improving the roller state. Therefore, the yield of glass articles can be increased.

  (3) The glass article manufacturing apparatus 11 includes a drive unit that rotationally drives the first roller R1 and the second roller R2 outside the heat insulating wall 14. The drive unit includes a first drive unit D1 that rotationally drives the first roller R1, and a second drive unit D2 that rotationally drives the second roller R2. The visual recognition unit 15 is provided so that any of the first roller R1, the second roller R2, and the glass ribbon G can be visually recognized from between the first drive unit D1 and the second drive unit D2. In this case, the effect described in the column (2) can be obtained. Further, the first roller R1 and the second roller R2 can be viewed from a closer position. Thereby, since the visibility of the external appearance state of a roller can be improved, more highly accurate process management becomes possible.

  (4) The visual recognition unit 15 in the glass article manufacturing apparatus 11 includes a closing member 17 that protrudes outward from the outer surface of the heat insulating wall 14 as the closing member 17. In this case, as described above, since the temperature around the glass ribbon G is easily stabilized, the influence on the quality of the glass ribbon G can be further suppressed.

  (5) The visual recognition unit 15 in the glass article manufacturing apparatus 11 includes a closing member 17 provided as an opening member 17 so that the opening of the through hole 16 can be opened and closed. In this case, the opening of the through hole 16 can be temporarily opened, and the state of the roller inside the heat insulating wall 14 can be improved through the through hole 16. Therefore, it is possible to save the trouble of removing the roller when improving the state of the roller.

  (6) The glass article manufacturing method is a method of manufacturing a glass article using the glass article manufacturing apparatus 11. According to this method, process management during manufacture of the glass article is facilitated.

(Example of change)
You may change the said embodiment as follows.
In the glass article manufacturing apparatus 11, the closing member 17 in the visual recognition unit 15 can be provided so as not to be opened and closed, for example, by adhering and fixing to the heat insulating wall 14 around the opening of the through hole 16.

  In the glass article manufacturing apparatus 11, the closing member 17 in the visual recognition unit 15 can be provided inside the through hole 16. Further, the closing member 17 may be provided so as to protrude inward from the inner surface of the heat insulating wall 14. When the blocking member 17 is provided so as to protrude outward from the outer surface of the heat insulating wall 14 as in the visual recognition portion 15 of the above embodiment, the visual recognition portion 15 protrudes inward from the inner surface of the heat insulating wall 14. Further, a closing member 17 provided on the inside of the through hole 16 or a closing member 17 provided inside the through hole 16 may be further provided. Even in this case, the effect described in the column (4) can be obtained.

  In the glass article manufacturing apparatus 11, the visual recognition unit 15 is provided so that the first roller R1, the second roller R2, and the glass ribbon G can be viewed from between the first drive unit D1 and the second drive unit D2. Yes. The visual recognition unit 15 is provided so that the first roller R1, the second roller R2, and the glass ribbon G can be viewed by looking down from above the drive unit, not between the first drive unit D1 and the second drive unit D2. May be. Moreover, the visual recognition part 15 may be provided so that the 1st roller R1, 2nd roller R2, and the glass ribbon G can be visually recognized by looking up from the downward direction of a drive part. For example, in the glass article manufacturing apparatus 11, when it is difficult to secure a gap between the first drive unit D1 and the second drive unit D2, or the first roller R1 and the second roller R2 are driven by one drive unit. In this case, it is possible to provide a visual recognition unit 15 that extends above the drive unit or below the drive unit.

  -Although the visual recognition part 15 in the manufacturing apparatus 11 of a glass article is provided so that the roller rotationally driven by the drive part can be visually recognized, the roller driven by the glass ribbon G conveyed is not connected with a drive part. You may comprise only the visual recognition part 15 provided so that visual recognition was possible. Moreover, the visual recognition part 15 in the glass article manufacturing apparatus 11 is driven by the visual recognition part 15 provided so that the roller driven to rotate by the drive part can be visually recognized, and the glass ribbon G conveyed without being connected to the drive part. The visual recognition part 15 provided so that the roller could be visually recognized may be included.

  -The visual recognition part 15 in the manufacturing apparatus 11 of glass articles can provide the roller which comprises at least 1 clamping part 13 among the several clamping parts 13 enclosed by the heat insulation wall 14 so that visual recognition is possible. Moreover, the visual recognition part 15 can also provide at least one roller of 1st roller R1 and 2nd roller R2 which comprises the clamping part 13 so that visual recognition is possible. Moreover, the visual recognition part 15 can also provide the roller which clamps at least one part of the one end side part in the width direction X of the glass ribbon G, and an other end side part so that visual recognition is possible.

  The visual recognition part 15 in the glass article manufacturing apparatus 11 can be provided on at least one wall part of the front wall 14a, the back wall 14b, and the pair of side walls 14c of the heat insulating wall 14. However, from the viewpoint of suppressing temperature variation on the main surface of the glass ribbon G, it is preferable to provide the visual recognition part 15 on at least one of the pair of side walls 14c.

  -When visually recognizing a roller or glass ribbon G from the visual recognition unit 15 in the glass article manufacturing apparatus 11, a light irradiation device that irradiates light to the roller or glass ribbon G or an imaging device that images the roller or glass ribbon G It may be used.

  -The glass which comprises the said glass article (glass ribbon G) may be a non-alkali glass, and the glass containing an alkaline component may be sufficient as it. In addition, as a use of a glass article, a display use, a touch panel use, a photoelectric conversion panel use, an electronic device use, a window glass use, a building material use, and a vehicle use are mentioned, for example.

  The glass article manufacturing apparatus 11 can be changed to a glass article manufacturing apparatus 11 other than a plate glass. The glass article manufacturing apparatus 11 may be configured as, for example, a glass article manufacturing apparatus 11 that manufactures a roll-shaped glass article by including a winder that winds a glass ribbon G (glass film) into a roll shape. it can.

  DESCRIPTION OF SYMBOLS 11 ... Manufacturing apparatus of glass articles, 12 ... Molding part, 13 ... Holding part, 14 ... Thermal insulation wall, 15 ... Visual recognition part, 16 ... Through-hole, 17 ... Closing member, R1 ... 1st roller, R2 ... 2nd roller, D1 ... 1st drive part, D2 ... 2nd drive part, G ... Glass ribbon, MG ... Molten glass.

Claims (6)

A molding part for flowing a molten glass to form a glass ribbon;
A sandwiching section for sandwiching the glass ribbon between the first roller and the second roller;
A heat insulating wall surrounding the molded part and the clamping part,
A glass article manufacturing apparatus for manufacturing a glass article by conveying the glass ribbon,
A visual recognition unit provided so that at least one of the first roller and the second roller is visible from the outside of the heat insulating wall;
The visible part may possess a through hole passing through the insulating wall, and a closure member for closing the through hole,
The said visual recognition part is equipped with the obstruction member provided as the said obstruction | occlusion member so that it might protrude outward rather than the outer surface of the said heat insulation wall, The manufacturing apparatus of the glass article characterized by the above-mentioned.   The said visual recognition part is provided so that all of the said 1st roller, the said 2nd roller, and the said glass ribbon can be visually recognized, The manufacturing apparatus of the glass article of Claim 1 characterized by the above-mentioned. A drive unit that rotationally drives the first roller and the second roller is provided outside the heat insulating wall,
The drive unit is
A first drive unit that rotationally drives the first roller; and a second drive unit that rotationally drives the second roller;
The visual recognition part is provided so as to be able to visually recognize any of the first roller, the second roller, and the glass ribbon from between the first drive part and the second drive part. The apparatus for manufacturing a glass article according to claim 1. The visible part, as the closure member, the manufacture of glass articles according to any one of claims 1 to 3, characterized in that it comprises the through hole closing member opening provided to be opened and closed in apparatus. The heat insulating wall includes a side wall provided along the thickness direction of the glass ribbon,
The said visual recognition part is provided in the said side wall, The manufacturing apparatus of the glass article as described in any one of Claims 1-4 characterized by the above-mentioned.   A glass article is produced using the glass article production apparatus according to any one of claims 1 to 5, wherein the glass article is produced.

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