WO2021117454A1 - Glass plate production method and production device - Google Patents

Abstract

The glass plate production method comprises a marking step of forming a mark M onto a glass plate G in a state wherein the glass plate G in a vertical orientation is being held from the upper end portion thereof. In the marking step, the mark M is formed in the upper portion of the glass plate G.

Description

Glass plate manufacturing method and manufacturing equipment

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

In the glass plate manufacturing process, from the viewpoint of manufacturing efficiency, a method of cutting out one or more glass plates to be a product from a large-area glass original plate may be adopted. Such a method is often used in the manufacturing process of glass substrates for displays such as liquid crystal displays and organic EL displays.

Specifically, for example, there are cases where the mother glass is cut out from a molded original plate manufactured by cutting a glass ribbon to a predetermined length by a float method or a down draw method, or a glass substrate for a display is cut out from the mother glass. .. In the former case, the molded original plate becomes the glass original plate, and in the latter case, the mother glass becomes the glass original plate.

Such a glass original plate may be transported in a vertical position. In addition, a marking step of forming a mark indicating identification information on the glass original plate may be performed on the transport path. For example, in the method described in Patent Document 1, a defect inspection step for inspecting defects contained in the original glass plate is performed on a path for transporting the original glass plate in a vertical posture. The defect information obtained in the defect inspection process is stored in the computer together with the identification information of the glass original plate. At the same time, a marking step of forming a mark indicating identification information on the glass original plate is performed on the transport path on the downstream side of the defect inspection step. Then, when the glass plate to be the product is cut out from the original glass plate, the mark formed on the original glass plate is read to obtain the optimum cutting pattern in consideration of the defect information from the computer.

JP-A-2018-104221

Patent Document 1 discloses that the posture of the original glass plate is maintained in the vertical posture by holding the upper end portion of the original glass plate by a chuck mechanism. Further, the same document discloses that a marking device is used to form a mark indicating identification information on a glass original plate in such a vertical posture.

However, if the upper end of the original glass plate is held and the original glass plate is placed in a vertical position, the original glass plate may shake when forming a mark indicating identification information. When the original glass plate is shaken in this way, the position of the original glass plate with respect to the marking device fluctuates greatly. Similarly, when the original glass plate is warped, the position of the original glass plate with respect to the marking device fluctuates greatly. Then, if the position of the glass original plate with respect to the marking device fluctuates in this way, there may be a problem that a mark cannot be appropriately formed on the glass original plate.

According to the present invention, when a mark is formed on a glass plate while holding the upper end portion of the glass plate in a vertical posture, it is possible to reliably suppress the occurrence of mark formation failure due to the shaking or warping of the glass plate. Make it an issue.

The present invention, which was devised to solve the above problems, is a method for manufacturing a glass plate including a marking process for forming a mark on the glass plate while holding the upper end portion of the glass plate in a vertical posture. The feature is that a mark is formed on the upper part of the glass plate.

In this way, since the upper end of the glass plate is held, the upper part of the glass plate is less affected by the shaking and warping of the glass plate than the lower part of the glass plate. Therefore, if the mark is formed on the upper part of the glass plate, it is possible to surely suppress the poor formation of the mark due to the shaking or warping of the glass plate.

In the above configuration, in the marking process, the glass plate is housed in the processing chamber, gas is supplied from the air supply port provided at the upper part of the processing chamber, and gas is supplied from the exhaust port provided at the lower part of the processing chamber. Is preferably exhausted.

By doing so, since a downward flow is formed in the processing chamber, particles such as dust floating in the processing chamber can be effectively removed. As a result, it is possible to reduce the adhesion of particles to the glass plate.

When performing the marking process in the processing chamber, it is preferable to set the direction of the gas supplied from the air supply port so that the gas supplied from the air supply port does not reach the glass plate directly.

By doing so, it is possible to reduce the shaking of the glass plate due to the gas supplied from the air supply port.

When the marking process is performed in the processing chamber, the direction of the gas supplied from the air supply port is changed by the windbreak member provided between the air supply port and the glass plate, and the gas supplied from the air supply port is changed. It is preferable not to reach the glass plate directly.

By using the windbreak member in this way, it is possible to easily reduce the shaking of the glass plate due to the gas supplied from the air supply port even in the existing equipment.

When a windbreak member is used, the windbreak member includes an inclined surface portion that covers the air supply port, and the inclined surface portion is inclined so that one end of the inclined surface portion is located above the other end of the inclined surface portion. One end is preferably attached to the upper part of the treatment chamber outside the air supply port.

By doing so, the installation of the windbreak member becomes easy, and the effect of preventing the gas supplied from the air supply port from directly reaching the glass plate is also high.

In the above configuration, in the marking process, it is preferable to print the mark on the glass plate with an inkjet printer.

In this way, marks can be easily formed even on a high-hardness glass substrate for a liquid crystal display.

A glass plate manufacturing device including a holding portion for holding an upper end portion of a glass plate in a vertical posture and a marking device for forming a mark on the glass plate held by the holding portion. The marking device is an upper portion of the glass plate. It is characterized in that it is configured to form a mark on the glass.

In this way, the same effect as the corresponding configuration already described can be enjoyed.

According to the present invention, when a mark is formed on a glass plate while holding the upper end portion of the glass plate in a vertical posture, it is possible to reliably suppress the occurrence of mark formation failure due to the shaking or warping of the glass plate. ..

It is a schematic plan view which shows the manufacturing apparatus of the glass plate which concerns on 1st Embodiment. FIG. 1 is a cross-sectional view taken along the line AA of FIG. It is a cross-sectional view of BB of FIG. It is sectional drawing which shows the processing chamber (including the windbreak member) of the glass plate manufacturing apparatus which concerns on 2nd Embodiment. It is sectional drawing which shows the windbreak member in the glass plate manufacturing apparatus which concerns on 3rd Embodiment. FIG. 5C is a cross-sectional view taken along the line CC of FIG. 5A. It is sectional drawing which shows the windbreak member in the glass plate manufacturing apparatus which concerns on 4th Embodiment. It is sectional drawing which shows the windbreak member in the manufacturing apparatus of the glass plate which concerns on 5th Embodiment. It is sectional drawing which shows the windbreak member in the glass plate manufacturing apparatus which concerns on 6th Embodiment. It is sectional drawing which shows the windbreak member in the glass plate manufacturing apparatus which concerns on 7th Embodiment. 9A is a cross-sectional view taken along the line DD of FIG. 9A. It is sectional drawing which shows the windbreak member in the glass plate manufacturing apparatus which concerns on 8th Embodiment. FIG. 10A is a cross-sectional view taken along the line EE of FIG. 10A. It is sectional drawing which shows the windbreak member in the glass plate manufacturing apparatus which concerns on 9th Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that XYZ in the figure is a Cartesian coordinate system. The X and Y directions are horizontal, and the Z direction is vertical. The X direction is the transport direction, and the Y direction is the width direction orthogonal to the transport direction.

(First Embodiment)
As shown in FIG. 1, the method for manufacturing a glass plate according to the first embodiment includes a molding step (not shown), a cutting step S1, a defect inspection step S2, and a marking step S3.

In other words, the glass plate manufacturing apparatus according to the present embodiment includes a processing chamber 1 for performing each of the above steps. The treatment chamber 1 forms a space that can block pollutants from the outside to some extent. The processing room 1 is, for example, a clean room. A plurality of spaces 2, 3, 4, 5, and 6 corresponding to each process are provided in the processing chamber 1. Each space 2 to 6 is partitioned by a partition wall 7. The partition wall 7 is provided with a slit-shaped opening (not shown) for allowing the glass original plate G to pass through. A shutter for opening and closing the opening may be provided in the opening for passing the glass original plate G. The division mode of the partition wall 7 in the processing chamber 1 can be changed as appropriate. However, it is preferable that the split mode is such that the glass powder generated in the space 2 in which the cutting step S1 is performed can be prevented from entering the other spaces 3 to 6.

In the molding process, a vertical glass ribbon is continuously molded by the overflow down draw method. The molding process is not limited to the process using the overflow down draw method. The molding step may be, for example, a step using another down draw method such as a slot down draw method or a redraw method, or a float method.

In the cutting step S1 (space 2), a glass original plate (glass plate) G, which is a molded original plate, is obtained by cutting the glass ribbon to a predetermined length while maintaining the vertical posture. In the cutting step S1, the glass ribbon is roughly cut by cutting due to bending stress. The cutting method (rough cutting) of the glass ribbon is not particularly limited, and may be laser cutting, laser cutting, or the like.

The glass original plate G obtained in the cutting step S1 is sequentially conveyed to the defect inspection step S2 and the marking step S3 provided on the downstream side of the cutting step S1 while maintaining the vertical posture (preferably the vertical posture). During this transfer, the upper end portion of the glass original plate G is held by the chuck mechanism (holding portion) 8. As a result, the glass original plate G is suspended and supported in a vertical posture. The chuck mechanism 8 is attached to a base member 9 that can move on a rail (not shown) extending along the transport direction X of the glass original plate G (see, for example, FIGS. 2 and 3). In the present embodiment, the transport direction X of the glass original plate G is a direction parallel to the main surfaces Ga and Gb of the glass original plate G, but the present invention is not limited to this.

The defect inspection step S2 includes a step S2a (space 5) of measuring the type (for example, bubbles, foreign matter, etc.), position (coordinates), and size of defects contained in the glass original plate G with the sensor 10. In the present embodiment, in the defect inspection step S2, before the step S2a, the step S2b (space 3) for measuring the uneven thickness of the glass original plate G with the sensor 11 and the streak (pulse) of the glass original plate G with the sensor 12 are performed. It further includes a step S2c (space 4) for measurement. In the defect inspection step S2, defect information including the inspection results of these steps S2a to S2c is generated. The defect information is stored in a computer (for example, a server) together with the identification information (including the ID information) of the glass original plate G to be inspected. The identification information may include information on the production area of the original glass plate G in addition to the ID information of the original glass plate G. In a computer, an optimum cutting pattern that takes defect information into consideration is required. As the cutting pattern, for example, a pattern that minimizes the amount of glass discarded is selected. The order of steps S2a to S2c is not particularly limited. Step S2b and step S2c may be omitted.

As shown in FIGS. 2 and 3, in the marking step S3 (space 6), the marking device 13 forms a mark M indicating identification information on the glass original plate G. While the mark M is formed, the transfer of the glass original plate G is stopped. Since the upper end portion of the glass original plate G is held by the chuck mechanism 8, the upper portion R of the glass original plate G is less affected by the shaking and warpage of the glass original plate G than the lower portion of the glass original plate G. Therefore, in the marking step S3, the marking device 13 forms the mark M on the upper portion R of the glass original plate G. As a result, it is possible to reliably suppress the poor formation of the mark M due to the shaking and warping of the glass original plate G.

Here, the peripheral portion of the glass original plate G is, for example, an ineffective portion Gx that is cut and removed at the time of cutting, and the central portion of the glass original plate G is a glass plate (for example, mother glass) that is a product at the time of cutting. It is said that the effective part is Gy. Therefore, it is preferable that the upper portion R of the glass original plate G on which the mark M is formed is included in the ineffective portion Gx. Specifically, the upper portion R of the glass original plate G on which the mark M is formed is preferably a region within 200 mm from the upper side of the glass original plate G, and more preferably a region within 150 mm from the upper side of the glass original plate G. preferable.

As the mark M, for example, a two-dimensional code (preferably a data matrix code) or the like can be used.

As a method for forming the mark M, for example, engraving (printing) by laser processing, printing with an inkjet printer, or the like can be used. The engraving by laser processing can form not only the main surface Ga of the glass original plate G but also the mark M inside the glass original plate G. However, the marking by laser processing may not be able to form the mark M on the glass original plate G used for, for example, a high-hardness glass substrate for a liquid crystal display. On the other hand, in printing with an inkjet printer, the mark M can be easily formed on the main surface Ga of the glass original plate G regardless of the hardness of the glass original plate G. Therefore, the method for forming the mark M is preferably printing with an inkjet printer.

In the marking step S3, gas (for example, air) F is supplied to the space 6 from the air supply port 14a of the air supply device 14 provided on the ceiling 1a of the processing chamber 1 while being provided on the floor surface 1b of the processing chamber 1. The gas F in the space 6 is exhausted from the exhaust port 15a of the exhaust device 15. In this way, a downward flow is formed in the space 6 of the processing chamber 1. This downward flow is formed on both main surfaces Ga and Gb of the glass original plate G. Therefore, particles such as dust floating in the space 6 of the processing chamber 1 can be effectively removed. As a result, it is possible to reduce the adhesion of particles to the glass original plate G.

The distance H from the air supply port 14a to the upper side of the glass original plate G is set to, for example, 500 mm to 2000 mm.

Note that FIG. 3 illustrates a case where a plurality of air supply ports 14a (air supply device 14) and exhaust ports 15a (exhaust device 15) are provided at intervals in the transport direction (three in the illustrated example). The number and arrangement of the air supply port 14a (air supply device 14) and the exhaust port 15a (exhaust device 15) are not particularly limited.

Although not shown, this manufacturing method further includes a packing step, a transportation step, and a processing step after the marking step S3.

In the packing process, a plurality of original glass plates G are laminated on a pallet and packed. The pallet may be one in which the glass original plates G are laminated in a vertical posture, or may be one in which the glass original plates G are laminated in a horizontal posture. When the original glass plate G is packed in a vertical posture, the posture of the original glass plate G preferably has an angle of 40 ° to 80 ° with the horizontal plane. When the original glass plate G is packed in the horizontal posture, the posture of the original glass plate G preferably has an angle formed by the horizontal posture of 0 ° (horizontal posture) to 30 °, and preferably 0 ° to 15 °. .. It is preferable that a protective sheet such as a paper (interlaced paper) or a foamed resin sheet is interposed between the glass original plates G.

In the transportation process, the glass original plate G packed in the pallet is transported to the processing process. Transport includes at least one of land, air and sea.

In the processing process, the mark M formed on the original glass plate G is read by a scanner. The computer outputs an optimum cutout pattern in consideration of the defect information corresponding to the read mark M. Then, the mother glass is cut out from the glass original plate G according to the cutting pattern output by the computer. At this time, the glass original plate G is placed on a surface plate or the like in a flat position, and the glass original plate G is precisely cut in this state. As a cutting method (fine cutting) of the glass original plate G, for example, bending stress cutting, laser cutting, laser cutting and the like can be used.

(Second Embodiment)
As shown in FIG. 4, the glass plate manufacturing method and the manufacturing apparatus according to the second embodiment are different from the first embodiment in the air supply port 14a in the space 6 of the processing chamber 1 in which the marking step S3 is performed. A point is that a windbreak member 21 is provided between the glass original plate G and the glass original plate G.

The windbreak member 21 adjusts the direction of the gas F supplied from the air supply port 14a so that the gas F supplied from the air supply port 14a does not directly reach the glass plate G. In other words, the windbreak member 21 prevents the gas F supplied from the air supply port 14a from flowing straight toward the glass original plate G located directly below the air supply port 14a. By providing the windbreak member 21 in this way, it is possible to reduce the shaking of the glass original plate G due to the gas F supplied from the air supply port 14a. That is, it is possible to more reliably suppress the poor formation of the mark M by the marking device 13.

In the present embodiment, the windbreak member 21 includes an inclined surface portion 22 that covers the air supply port 14a. One end 22a of the inclined surface portion 22 in the width direction Y is attached to the ceiling 1a of the processing chamber 1 (space 6) on the side of the air supply port 14a. The other end 22b of the inclined surface portion 22 in the width direction Y is located below the one end 22a of the inclined surface portion 22. That is, the inclined surface portion 22 is inclined in the width direction Y. The gas F supplied from the air supply port 14a collides with the inclined surface portion 22 and is guided to one side in the width direction Y following the inclined surface portion 22. Therefore, the gas F is mainly guided to one main surface Gb side of the glass original plate G, but the downward flow due to the gas F is generated on both main surfaces Ga and Gb sides (both sides) of the glass original plate G. The causes of the downward flow on both sides of the original glass plate G are that the original glass plate G is intermittently conveyed into the processing chamber 1 in which the marking step S3 is performed, and that the gas F is introduced below the original glass plate G. Exhaust from the exhaust port 15a, and the like. The inclined surface portion 22 may be inclined in the transport direction X.

The angle θ formed by the inclined surface portion 22 with the horizontal plane is preferably 35 ° to 55 °.

Other configurations in this embodiment are the same as those in the first embodiment. In the present embodiment, components common to the first embodiment are designated by a common reference numeral.

(Third Embodiment)
As shown in FIGS. 5A and 5B, in the third embodiment, a modification of the windbreak member 21 described in the second embodiment will be illustrated.

The windbreak member 31 according to the present embodiment includes a triangular roof portion 32 and a support column 33. The triangular roof portion 32 includes two inclined surfaces 32a that cover the air supply port 14a at a position downwardly separated from the air supply port 14a. The two inclined surfaces 32a are inclined in the width direction Y so that the central portion of the triangular roof portion 32 in the width direction Y is the top. A total of four columns 33 are provided at the four corners of the triangular roof portion 32, and the triangular roof portion 32 is suspended and supported from the ceiling 1a of the processing chamber 1 (space 6). The number and position of the columns 33 are not limited to this. After colliding with the triangular roof portion 32, the gas F supplied from the air supply port 14a is separated on both sides in the width direction Y following each inclined surface 32a of the triangular roof portion 32. The two inclined surfaces 32a may be inclined in the transport direction X so that the central portion of the triangular roof portion 32 in the transport direction X is the top.

Other configurations in this embodiment are the same as those in the first embodiment and the second embodiment. In the present embodiment, components common to the first embodiment and the second embodiment are designated by a common reference numeral.

(Fourth Embodiment)
As shown in FIG. 6, in the fourth embodiment, a modified example of the windbreak member 21 described in the second embodiment will be illustrated.

The windbreak member 41 according to the present embodiment includes a partially tubular portion 42 and a support column 43. The partial tubular portion 42 covers the air supply port 14a at a position downward from the air supply port 14a. The partial tubular portion 42 is curved in the width direction Y so that the central portion of the partial tubular portion 42 in the width direction Y is the top. A total of four columns 43 are provided at the four corners of the partial tubular portion 42, and the partial tubular portion 42 is suspended and supported from the ceiling 1a of the processing chamber 1 (space 6). The number and position of the columns 43 are not limited to this. After colliding with the partial tubular portion 42, the gas F supplied from the air supply port 14a is separated on both sides in the width direction Y following the partial tubular portion 42. The partial tubular portion 42 may be curved in the transport direction X so that the central portion of the partial tubular portion 42 in the transport direction X is the top.

Other configurations in this embodiment are the same as those in the first embodiment and the second embodiment. In the present embodiment, components common to the first embodiment and the second embodiment are designated by a common reference numeral.

(Fifth Embodiment)
As shown in FIG. 7, in the fifth embodiment, a modified example of the windbreak member 21 described in the second embodiment is illustrated.

The windbreak member 51 according to the present embodiment includes a horizontal surface portion 52 and a support column 53. The horizontal surface portion 52 covers the air supply port 14a at a position downward from the air supply port 14a. A total of four columns 53 are provided at the four corners of the horizontal surface portion 52, and the horizontal surface portion 52 is suspended and supported from the ceiling 1a of the processing chamber 1 (space 6). The number and position of the columns 53 are not limited to this. After colliding with the horizontal plane portion 52, the gas F supplied from the air supply port 14a is separated on both sides in the width direction Y following the horizontal plane portion 52. The gas F supplied from the air supply port 14a may be separated on both sides in the transport direction X following the horizontal surface portion 52 after colliding with the horizontal surface portion 52.

Other configurations in this embodiment are the same as those in the first embodiment and the second embodiment. In the present embodiment, components common to the first embodiment and the second embodiment are designated by a common reference numeral.

(Sixth Embodiment)
As shown in FIG. 8, in the sixth embodiment, a modified example of the windbreak member 21 described in the second embodiment is illustrated.

The windbreak member 61 according to the present embodiment includes an inverted triangular roof portion 62 and a support column 63. The inverted triangular roof portion 62 includes two inclined surfaces 62a that cover the air supply port 14a at a position downwardly separated from the air supply port 14a. The two inclined surfaces 62a are inclined in the width direction Y so that the central portion of the inverted triangular roof portion 62 in the width direction Y is the bottom portion. A total of four columns 63 are provided at the four corners of the inverted triangular roof portion 62, and the inverted triangular roof portion 62 is suspended and supported from the ceiling 1a of the processing chamber 1 (space 6). The number and position of the columns 63 are not limited to this. After colliding with the inverted triangular roof portion 62, the gas F supplied from the air supply port 14a is separated on both sides in the width direction Y following each inclined surface 62a of the inverted triangular roof portion 62. The two inclined surfaces 62a may be inclined in the conveying direction X so that the central portion of the inverted triangular roof portion 62 in the conveying direction X is the bottom portion.

Other configurations in this embodiment are the same as those in the first embodiment and the second embodiment. In the present embodiment, components common to the first embodiment and the second embodiment are designated by a common reference numeral.

(Seventh Embodiment)
As shown in FIGS. 9A and 9B, the seventh embodiment exemplifies a modification of the windbreak member 21 described in the second embodiment.

The windbreak member 71 according to this embodiment includes a partial tubular portion 72. The partial tubular portion 72 extends along the width direction Y, and both ends in the upper direction and the width direction Y are open. The partial tubular portion 72 is attached to the ceiling 1a of the processing chamber 1 (space 6) so as to cover the air supply port 14a. After colliding with the partial tubular portion 72, the gas F supplied from the air supply port 14a is separated on both sides in the width direction Y following the partial tubular portion 72. The partial tubular portion 72 may extend along the transport direction X and may be open upward and at both ends in the transport direction X.

Other configurations in this embodiment are the same as those in the first embodiment and the second embodiment. In the present embodiment, components common to the first embodiment and the second embodiment are designated by a common reference numeral.

(Eighth embodiment)
As shown in FIGS. 10A and 10B, the eighth embodiment exemplifies a modification of the windbreak member 21 described in the second embodiment.

The windbreak member 81 according to this embodiment includes a box-shaped portion 82. The box-shaped portion 82 is attached to the ceiling 1a of the processing chamber 1 (space 6) so as to cover the air supply port 14a. The box-shaped portion 82 is open at the upper side and has a plurality of ventilation holes 83 on both side wall surfaces 82a in the width direction Y. After colliding with the box-shaped portion 82, the gas F supplied from the air supply port 14a is separated into both sides in the width direction Y through the ventilation holes 83 of the side wall surfaces 82a. The ventilation holes 83 may be provided on the wall surfaces 82b on both sides of the box-shaped portion 82 in the transport direction X.

Other configurations in this embodiment are the same as those in the first embodiment and the second embodiment. In the present embodiment, components common to the first embodiment and the second embodiment are designated by a common reference numeral.

(Ninth Embodiment)
As shown in FIG. 11, in the ninth embodiment, a modified example of the windbreak member 21 described in the second embodiment is illustrated.

The windbreak member 91 according to this embodiment includes a duct 92. The duct 92 is a tubular member directly connected to the air supply port 14a. A plurality of ducts 92 are provided so that the gas F supplied from the air supply port 14a is separated on both sides in the width direction Y. A plurality of ducts 92 may be provided so that the gas F supplied from the air supply port 14a is separated on both sides of the transport direction X.

Other configurations in this embodiment are the same as those in the first embodiment and the second embodiment. In the present embodiment, components common to the first embodiment and the second embodiment are designated by a common reference numeral.

The present invention is not limited to the configuration of the above-described embodiment, and is not limited to the above-mentioned action and effect. The present invention can be modified in various ways without departing from the gist of the present invention.

In the above embodiment, the case where the air supply port (air supply device) and the exhaust port (exhaust device) are provided in the space where the marking process of the processing chamber is performed has been described. An air supply port and an exhaust port may be provided in the space. In this case, it is preferable to provide a windbreak member between the air supply port and the glass plate so that the gas supplied from the air supply port does not directly reach the glass plate, as in the space where the marking process is performed.

In the above embodiment, the case where the gas supplied from the air supply port is prevented from directly reaching the glass original plate is illustrated by the windbreak member, but the arrangement position and the air volume of the air supply port are illustrated without using the windbreak member. , The direction of the wind, etc. may be adjusted so that the gas supplied from the air supply port does not reach the original glass plate directly.

In the above embodiment, a case where a mark is formed on the molded original plate and the mother glass is cut out from the molded original plate is illustrated, but in the present invention, the mark is formed on the glass plate while holding the upper end portion of the glass plate in the vertical posture. As long as it is, it can be applied in various cases. For example, the present invention can be applied to the case where a mark is formed on the mother glass and a glass substrate for a final product such as a glass substrate for a liquid crystal display is cut out from the mother glass.

1 Processing chamber 8 Chuck mechanism 13 Marking device 14 Air supply device 14a Air supply port 15 Exhaust device 15a Exhaust port 21 Windbreak member 22 Inclined surface part 31 Windproof member 32 Triangular roof part 41 Windproof member 42 Partial tubular part 51 Windproof member 52 Horizontal part 61 Windproof member 62 Inverted triangular roof 71 Windproof member 72 Partial tubular part 81 Windproof member 82 Box-shaped part 91 Windproof member 92 Duct F Gas G Glass original plate M Mark S1 Cutting process S2 Defect inspection process S3 Marking process

Claims (7)

1. A method for manufacturing a glass plate, which comprises a marking step of forming a mark on the glass plate while holding the upper end portion of the glass plate in a vertical posture.
   The marking step is a method for manufacturing a glass plate, characterized in that the mark is formed on the upper portion of the glass plate.
2. In the marking step, the glass plate is housed in the processing chamber, and the gas is supplied from the air supply port provided at the upper part of the processing chamber while the gas is supplied from the exhaust port provided at the lower part of the processing chamber. The method for manufacturing a glass plate according to claim 1.
3. The method for manufacturing a glass plate according to claim 2, wherein the direction of the gas supplied from the air supply port is set so that the gas supplied from the air supply port does not directly reach the glass plate.
4. A windbreak member provided between the air supply port and the glass plate changes the direction of the gas supplied from the air supply port, and the gas supplied from the air supply port is the glass plate. The method for manufacturing a glass plate according to claim 3, wherein the glass plate is not directly reached.
5. The windbreak member includes an inclined surface portion that covers the air supply port.
   The inclined surface portion is inclined so that one end of the inclined surface portion is located above the other end of the inclined surface portion.
   The method for manufacturing a glass plate according to claim 4, wherein the one end of the inclined surface portion is attached to the upper part of the processing chamber outside the air supply port.
6. The method for manufacturing a glass plate according to any one of claims 1 to 5, wherein in the marking step, the mark is printed on the glass plate by an inkjet printer.
7. A glass plate manufacturing apparatus including a holding portion for holding an upper end portion of a glass plate in a vertical posture and a marking device for forming a mark on the glass plate held by the holding portion.
   The marking device is a glass plate manufacturing device characterized in that the mark is formed on an upper portion of the glass plate.

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