TWI741034B - Plate glass manufacturing method and plate glass manufacturing device - Google Patents

Abstract

The method of manufacturing plate glass is at the beginning of continuous manufacturing of plate glass (GR). It includes the following procedures: from the molded body (4), a part of the molten glass (GM) is suspended into a glass block (GL); The roller (10) clamps the glass block (GL), and the separation distance (D1) of the first roller (10) in the width direction (X) of the molded body (4) is set to be greater than the width of the molded body (4) The separation distance (D2) of the second roller (11) in the direction (X) is small.

Description

Plate glass manufacturing method and plate glass manufacturing device

[0001] The present invention relates to a method and apparatus for manufacturing plate glass from molten glass.

[0002] As well known, for example, glass substrates for flat panel displays (FPD) such as liquid crystal displays (LCD), plasma displays (PDP), organic EL displays (OLED), etc., are used in various fields of sheet glass. , Is actually the product quality that requires strict requirements for surface defects, ripples, etc.　　[0003] In order to meet such requirements, the down-draw method is widely used in the manufacturing method of plate glass. For this down-drawing method, the overflow down-drawing method, the orifice down-drawing method, etc. are well-known. [0004] The overflow down-draw method is as follows: the molten glass flows into an overflow channel provided on the upper part of the formed body having a substantially wedge-shaped cross-section, and the molten glass overflowing from the overflow channel to both sides is allowed to follow the forming body The side walls on both sides flow down, and while the lower end of the molded body is fused and integrated, one sheet glass is continuously molded. In addition, the orifice down-draw method is a method in which a slit-shaped opening is formed on the bottom wall of a molded body to which molten glass is supplied, and the molten glass is flowed down through the opening to continuously shape a single sheet glass. [0005] In particular, the overflow down-draw method is that the front and back sides of the formed plate glass are formed during the forming process without contacting any part of the formed body, so it has excellent flatness and no defects such as scratches. Flame polished surface. [0006] For example, in the sheet glass manufacturing apparatus using the overflow down-draw method, as disclosed in Patent Document 1, there are those that have the following elements: a forming furnace having a formed body inside, an annealing furnace installed below the forming furnace, and equipment Cooling part and cutting part below the annealing furnace. This plate glass manufacturing device is configured to cause molten glass to overflow from the top of the molded body, and at the same time to fuse at the lower end to shape the plate glass (glass ribbon), and pass the plate glass through an annealing furnace to remove its internal deformation. , After the cooling part is cooled to room temperature, the cut part is cut to a predetermined size. In the annealing furnace, a plurality of upper and lower rollers are arranged for pulling the plate glass formed through the formed body. [Prior Art Document] [Patent Document] 　　[0007] [Patent Document 1] Japanese Patent Laid-Open No. 2012-197185

[Problem to be solved by the invention] 　　[0008] In the preparatory stage of the forming process in the forming furnace, the molten glass overflowing from the formed body is formed into a block at the lower end of the formed body (hereinafter referred to as "glass Piece"). When starting the forming process, the following preparations need to be carried out efficiently: stretch the glass block and clamp the rollers in the annealing furnace.　　[0009] The present invention was created in view of the above-mentioned circumstances, and aims to provide a plate glass manufacturing method and a plate glass manufacturing apparatus that can efficiently perform preparation operations for a forming process. [Technical Means for Solving the Problem] 　　[0010] The present invention is to solve the above-mentioned problems. The molten glass is poured down from a formed body to form a sheet glass, and at the same time, it passes through a glass that is arranged below and above the formed body. A set of first rollers separated in the width direction, and a set of second rollers separated in the width direction of the molded body are arranged below the first roller, and the upper and lower plural stages of the second roller are drawn, thereby pulling In the method of continuously manufacturing the plate glass, the plate glass includes the following procedure at the beginning of the continuous production of the plate glass: a part of the molten glass is suspended from the molded body into a glass lump; in order to pass through the first The roller clamps the glass block, and the separation distance in the width direction of the first roller is set to be smaller than the separation distance in the width direction of the second roller.　　[0011] At the beginning of the manufacture of sheet glass, that is, in the preparation stage of the forming process, the glass block produced at the lower end of the formed body is formed at the center position in the width direction of the formed body. In this method, the separation distance of the first roller in the width direction of the molded body is set to be smaller than the separation distance of the second roller, so that the glass block can be surely held by the first roller. The glass block is clamped and cooled by the first roller, and its width is widened and deformed into a plate shape. The portion deformed into a plate shape is sandwiched by the second roller below to further expand the width, and a plate glass having a desired width can be formed. Through such a positional relationship between the first roller and the second roller, the preparation for the forming process can be performed efficiently.　　[0012] In the above-mentioned method for manufacturing plate glass, the first roller has a shaft portion that supports the first roller, and can be configured to be movable in the axial direction of the shaft portion. Accordingly, the first roller is configured to be movable in the axial direction, so that the position of the first roller can be adjusted according to the position and size of the glass block. Therefore, the first roller can surely hold the glass block in an appropriate position. [0013] In the above-mentioned plate glass manufacturing method, preferably, the first roller is moved to the widthwise end of the molded body after clamping the glass block so as to be the same position as the second roller. The location of the department. Accordingly, the first roller can guide the glass block to the side of the second roller, and the second roller can clamp the glass block earlier.　　[0014] In addition, it is preferable that after the second roller clamps the end portion of the plate glass, the first roller is separated so as not to contact the plate glass. Through the second roller, the first roller is separated from the plate glass in the state of continuously forming the plate glass of a predetermined width, so that the plate glass can be stabilized and drawn by the second roller without a sharp change in the temperature of the plate glass .　　[0015] In the above-mentioned plate glass manufacturing method, the pressure at which the first roller clamps the glass block is preferably set to be higher than the pressure at which the second roller clamps the plate glass. According to this, the glass block can be surely clamped by the first roller, and the width of the glass block is appropriately expanded in such a manner that a part of the glass block faces the second roller. [0016] In the above-mentioned plate glass manufacturing method, preferably, the second roller has a shaft portion supporting the second roller, and the length of the shaft portion of the first roller is set to be longer than that of the second roller. The length of the aforementioned shaft portion is long. By configuring the shaft portion of the first roller to be long in this way, the moving range of the first roller in the axial direction can be increased as much as possible. Therefore, the first roller can surely hold the glass block in accordance with the size and position of the glass block that changes due to the size of the plate glass, temperature conditions, and the like.　　[0017] In the above-mentioned plate glass manufacturing method, preferably, the width of the first roller is set to be larger than the width of the second roller. According to this, the first roller can surely hold the glass block. Furthermore, the ability of the first roller to cool the glass block is improved, so that the clamped glass block can effectively expand in the direction of the second roller. [0018] The present invention is to solve the above-mentioned problems, a plate glass manufacturing apparatus, including: a part of the molten glass is suspended into a glass block, and the molten glass is molded into a molded body of the plate glass; arranged in the molding The lower part of the body and pull the upper and lower plural stages of the plate glass; the roller includes a set of first rollers arranged below the formed body and separated in the width direction of the formed body, and is arranged on the A set of second rollers separated in the width direction of the molded body under the first roller has a separation in the width direction of the first roller in order to sandwich the glass block through the first roller The distance is set to a structure smaller than the separation distance in the width direction of the second roller.　　[0019] In the preparation stage of the forming process, the glass block produced at the lower end of the formed body is formed at the center position in the width direction of the formed body. In the above-mentioned plate glass manufacturing apparatus, the separation distance of the first roller in the width direction of the molded body is set to be smaller than the separation distance of the second roller, so that the glass block can be surely held by the first roller. The glass block clamped by the first roller is cooled by the first roller so that its width is gradually stretched and clamped by the second roller. According to this, the plate glass system can be continuously molded while maintaining a predetermined width. Through such a positional relationship between the first roller and the second roller, the plate glass manufacturing device can efficiently perform preparation operations for the forming process. [Comparison with the effects of the prior art] 　　[0020] According to the present invention, the preparation for the forming process can be performed efficiently.

[0022] Hereinafter, the mode of implementing the present invention will be described with reference to the drawings. Figures 1 to 9 show one embodiment of a plate glass manufacturing method and a plate glass manufacturing apparatus related to the present invention.　　[0023] As shown in FIGS. 1 and 2, the plate glass manufacturing apparatus 1 mainly includes a forming furnace 2 and an annealing furnace 3 located below the forming furnace 2. The plate glass manufacturing apparatus 1 forms the molten glass GM supplied from the melting furnace on the upstream side into the plate glass GR through the forming furnace 2, and then removes the internal strain of the plate glass GR in the annealing furnace 3.　　[0024] The forming furnace 2 includes a forming body 4 that performs an overflow down-draw method on the inner side of the furnace wall, and an edge roller 5 that draws out molten glass GM overflowing from the forming body 4 as plate glass GR.　　[0025] The molded body 4 is configured in a long shape and has an overflow groove 6 formed along the longitudinal direction at the top. In addition, the molded body 4 is provided with a pair of vertical surface portions 7 and inclined surface portions 8 constituting side wall portions facing each other. It is formed to connect the inclined surface portion 8 to the lower end of the vertical surface portion 7. The pair of inclined surface portions 8 gradually approach downward and intersect each other to form the lower end portion 9 of the molded body 4. [0026] As shown in FIG. 1, the edge roller 5 is set directly below the molded body 4, and is configured to be left and right in front view so as to sandwich the ends GRa and GRb in the width direction X of the plate glass GR. One group. In addition, as shown in FIG. 2, the edge rollers 5 are configured as a roller pair, and are juxtaposed in the thickness direction Y of the plate glass GR so as to sandwich the ends GRa and GRb of the width direction X of the plate glass GR. . In addition, in the following, the longitudinal direction of the molded body 4 is referred to as the "width direction." Refer to Figure 7 and Figure 8). [0027] In this forming furnace 2, the molten glass GM is poured into the overflow groove 6 of the molded body 4, and the molten glass GM overflowing from the overflow groove 6 to both sides flows down along the vertical surface portion 7 and the inclined surface portion 8. , While the lower end 9 is fused and integrated, one sheet glass GR is continuously formed. In addition, the molded body 4 is not limited to the above-mentioned structure, and may be a structure that performs the orifice down-draw method.　　[0028] As shown in Figs. 1 and 2, the annealing furnace 3 has rolls (annealing rolls) 10 to 13 that are configured in plural stages (four stages in the figure) in the vertical direction. Hereinafter, these plural-stage rollers 10 to 13 are referred to as the first roller 10 to the fourth roller 13 in order from the top. As shown in FIG. 2, each of the rollers 10 to 13 is configured as a roller pair that sandwiches the plate glass GR in the thickness direction Y. In addition, each of the rollers 10 to 13 is configured as a pair of left and right in a front view (refer to FIG. 1) in a front view (refer to FIG. 1) so as to sandwich the ends GRa and GRb in the width direction X of the plate glass GR.　　[0029] The rollers 10-13 are individually provided with shaft portions 10a-13a that support the rollers 10-13. Each of the rollers 10-13 is a cantilever roller supported by one end of each shaft part 10a-13a. The length L1 of the shaft portion 10a of the first roller 10 is set to be longer than the lengths L2 to L4 of the shaft portions 11a to 13a of the other rollers 11-13. The shaft portions 11a to 13a of the second roller 11, the third roller 12, and the fourth roller 13 are configured such that the lengths L2 to L4 are equal.　　[0030] As shown in FIG. 3, a cooling device 14 is provided on each shaft portion 10a-13a of each roller 10-13. The cooling device 14 is formed by arranging cooling pipes 15 inside shaft portions 10 a to 13 a configured in a hollow shape. The cooling pipe 15 has an opening 15a through which a cooling medium such as air is discharged. The cooling medium discharged from the mouth portion 15a passes through the shaft portions 10a-13a to cool the shaft portions 10a-13a and the rollers 10-13.　　[0031] The rollers 10 to 13 paired in the thickness direction Y of the plate glass GR are configured such that the distance between their axes can be changed. In addition, each of the rollers 10 to 13 is configured to be movable along the axial direction thereof, that is, along the width direction X of the molded body 4 or the plate glass GR. Hereinafter, the direction from the end portions 4a and 4b of the molded body 4 toward the central portion 4c is referred to as "axial direction inward", and the direction from the central portion 4c to the end portions 4a and 4b is referred to as "axial direction outward".　　[0032] The width W1 of the first roller 10 is configured to be larger than the widths W2 to W4 of the other rollers 11 to 13. The width W2 of the second roller 11, the width W3 of the third roller 12, and the width W4 of the fourth roller 13 are configured to be equal.　　[0033] The first roller 10 is mainly used in the forming preparation process of the plate glass GR, and is used to hold the glass lump GL formed through the molten glass GM overflowing from the formed body 4. When the second roller 11 to the fourth roller 13 are formed into a plate shape by deforming the glass block GL clamped by the first roller 10, they are used to clamp a part of the glass block while clamping a plate of a predetermined width. The end portions GRa and GRb in the width direction X of the glass GR.　　[0034] Hereinafter, a method (plate glass manufacturing method) for forming a plate glass GR through the plate glass manufacturing apparatus 1 configured as described above will be described. At the start of the production of the plate glass GR, it is necessary to perform an operation (preparatory operation for a molding program) of sandwiching the molten glass GM flowing down from the molded body 4 by the respective rollers 5, 10-13. That is, the molten glass GM supplied from the melting furnace is poured into the overflow groove 6 of the molded body 4, and at the same time, it overflows from the overflow groove 6 and follows the vertical surface portion 7 and the inclined surface portion 8, and merges at the lower end portion 9. At this time, the left and right edge rollers 5 sandwich a part of the molten glass GM that is about to merge and drop (hang down) (refer to FIG. 4). In addition, in the present invention, when the production of the plate glass GR is started, it refers to the case where the preparation work for the forming process of the plate glass GR is required. For example, it also includes the beginning of the plate glass GR after the operation of the plate glass manufacturing apparatus 1 is temporarily interrupted. Case.　　[0035] As shown in FIG. 4, the molten glass GM is located at the central part 4c in the width direction X of the molded body 4 to form a glass block GL. This glass block GL is periodically dropped (hanging down) from the molded body 4 a plurality of times. The first roller 10 stands by at the positions of the end portions 4a and 4b in the width direction X of the molded body 4. In this standby position, the first roller 10 is located at the same position as the other rollers 11-13 in the width direction X. Therefore, the separation distance D1 of the first roller 10 is equal to the separation distances D2 to D4 of the other rollers 11-13. [0036] When the glass block GL is formed, as shown in FIG. 5, the first roller 10 moves from the standby position to the position (initial clamping position) of the central part 4c of the molded body 4 in the width direction X, and clamps This glass block GL (using the clamping procedure of the glass block GL under the first roller 10). In this case, as shown in FIG. 6, the first roller 10 of the roller pair is close to each other (indicated by a two-dot chain line), thereby clamping the glass block GL in the middle of falling (hanging down). [0037] Here, the width of the glass block GL is smaller than the width of the plate glass GR to be formed later. Therefore, the first roller 10 is arranged at a position close to the central portion 4c of the formed body 4, that is, arranged at a later position. The position of the center part GRc of the width direction X of the formed plate glass GR. In other words, the separation distance D1 in the axial direction (width direction X) of the first roller 10 forming a left and right set in front view is smaller than the separation distance D2 to D4 in the axial direction of the left and right sets of the other rollers 11-13 (Figure 5 Reference).　　[0038] The size of the glass block GL varies according to the size and temperature conditions of the formed plate glass GR. For this reason, the separation distance D1 of the first roller 10 is adjusted by moving in the axial direction. The first rollers 10 paired in the plate thickness direction Y of the plate glass GR have a pressure to clamp the glass block GL, and are set to be higher than the pressure of the other rollers 11 to 13 to clamp the plate glass GR.　　[0039] The first roller 10 clamps the glass block GL to cool it, and expands the width of the glass block GL. In order to cope with such expansion of the glass block GL, the first roller 10, as shown in FIG. 7, moves from a position close to the central portion 4c of the molded body 4 to the outside in the axial direction. Following this, the width of the glass block GL is further expanded. According to this, the glass block GL is close to the second roller 11.　　[0040] The second roller 11 of the left and right set moves inward in the axial direction in order to sandwich a part of the glass block GL. According to this, the second rollers 11 are close to each other, and their separation distance D2 becomes smaller. At this time, the separation distance D2 of the second roller 11 is set to be approximately equal to or slightly larger than the separation distance D1 of the first roller 10. After that, the second roller 11 clamps a part of the glass block GL expanded through the first roller 10. When the second roller 11 clamps a part of the glass block GL, it returns to its original position (the separation distance D2 increases again). Through such actions of the first roller 10 and the second roller 11, the width of the glass block GL becomes wider and gradually deforms into a plate shape. Following this, the molten glass GM connected to the upstream side (upper side) of the glass block GL is also shaped into a plate shape while expanding its width.　　[0041] The glass block GL whose width is further expanded by passing through the second roller 11 reaches the third roller 12. Accordingly, the third roller 12 clamps a part of the glass block GL and guides it downward. After that, the fourth roller 13 clamps a part of the glass block GL and guides it downward (refer to FIG. 8). In this way, the width of the plate-shaped molten glass GM connected to the glass block GL is further expanded by being sandwiched by the second roller 11 to the fourth roller 13. As a result, the plate glass GR having the desired width is passed by the second roller 11 to the fourth roller 13 pull (refer to Figure 1). [0042] The second roller 11 to the fourth roller 13, when the molten glass GM is formed into a plate glass GR of a predetermined width, the end portions GRa and GRb in the width direction X of the plate glass GR are sandwiched. , In the width direction X (axial direction), separated by a certain separation distance D2 to D4 (refer to FIG. 1). In this case, although the separation distances D2 to D4 are set to be equal, it is not limited to this, and it can be set to be different depending on the state of the plate glass GR.　　[0043] The first roller 10 releases the clamping of the plate glass GR when the plate glass GR is clamped by the second roller 11 to the fourth roller 13. That is, as shown in FIG. 9, the pair of first rollers 10 are separated from the plate glass GR by increasing the distance between their axes. According to this, the first roller 10 does not contact the plate glass GR, so the plate glass GR is not passed through the first roller 10 and cooled. After that, the first roller 10 can be moved outward in the axial direction to be further separated from the plate glass GR. In this case, the separation distance D1 of the first roller 10 of the left and right set can be made larger than the separation distances D2 to D4 of the other rollers 11-13. [0044] According to the plate glass manufacturing apparatus 1 and the plate glass manufacturing method related to the present embodiment described above, at the start of the manufacture of the plate glass GR (during preparation for the forming process), the first roller 10 is formed The lower part of the body 4 is arranged at a position close to the central part 4c in the width direction X of the molded body 4 (the position of the plate glass GR close to the central part GRc in the width direction), so that the separation distance D1 of the first roller 10 is set to It is smaller than the separation distance D2 of the second roller 11. According to this, it is possible to surely hold the glass block GL produced in the preparation stage of the forming process.　　[0045] The glass block GL is clamped and cooled by the first roller 10, and its width is widened and deformed into a plate shape. The portion deformed into a plate shape is passed through the lower second roller 11 and sandwiched, thereby further expanding the width of the molten glass GM, so that the plate glass GR having a desired width can be formed. According to this, the plate glass manufacturing apparatus 1 and the plate glass manufacturing method can efficiently perform the preparation work of the forming process.　　[0046] In addition, the first roller 10 is configured to be movable in the axial direction, so that the position of the first roller 10 can be adjusted according to the position and size of the glass block GL. Therefore, the first roller 10 can surely clamp the glass block GL at an appropriate position. In addition, the first roller 10 moves outward in the axial direction so as to be the same position as the second roller 11 after sandwiching the glass block GL. The first roller 10 moves to the positions of the end portions 4a, 4b of the molded body 4 in the width direction X, so that the glass block GL can be guided to the second roller 11 side, and the second roller 11 can clamp the glass block earlier GL. [0047] In addition, after the end portions GRa, GRb of the plate glass GR are clamped by the second roller 11, the first roller 10 is separated so as not to contact the plate glass GR, so that the cooling effect of the first roller 10 is not involved. Under the plate glass GR, the plate glass GR of uniform thickness is appropriately drawn through the second roller 11 to the fourth roller 13. In addition, the pressure at which the first roller 10 clamps the glass block GL is set to be greater than the pressure at which the second roller 11 clamps the plate glass GR, so that the first roller 10 can reliably clamp the glass block whose thickness is larger than the plate glass GR. GL. In addition, through the first roller 10, the width of the glass block GL can be appropriately expanded so that a part of the glass block GL faces the second roller 11. [0048] In addition, by setting the length L1 of the shaft portion 10a of the first roller 10 to be longer than the lengths L2 to L4 of the shaft portions 11a to 13a of the second roller 11 to the fourth roller 13, it is possible to increase the first roller as much as possible. A range of movement of the roller 10 in the axial direction. In addition, by reducing the length of the shaft portions 11a-13a of the second roller 11 to the fourth roller 13 to minimize the center vibration of the second roller 11 to the fourth roller 13, the plate glass GR can be pulled appropriately.　　[0049] The width W1 of the first roller 10 is set to be larger than the widths W2 to W4 of the other rollers 11 to 13, so that the first roller 10 can surely clamp the glass block GL, and the ability to cool the glass block can be improved.　　[0050] In addition, the present invention is not limited to the constitution of the above-mentioned embodiment, nor is it limited to the above-mentioned effect. The present invention can be modified in various ways without departing from the gist of the present invention.　　[0051] In the above-mentioned embodiment, although the first roller 10 is moved outward in the axial direction after the glass block GL is clamped, it is not limited to this. The first roller 10 may remain at this position while holding the glass block GL. [0052] In the above-mentioned embodiment, although the first roller 10 and the second roller 11 are moved in the axial direction to clamp the glass block GL, the example is not limited to this, and the third The roller 12 and the fourth roller 13 are moved in the axial direction to pinch the glass block GL.

[0053]1‧‧‧Plate glass manufacturing equipment4‧‧‧Formed body 10‧‧‧The first roller 10a‧‧‧The shaft of the first roller 11‧‧‧The second roller 11a‧‧‧The shaft of the second roller Part GL‧‧‧Glass block GM‧‧‧Molten glass GR‧‧‧Plate glass L1‧‧‧The length of the shaft of the first roller L2‧‧‧The length of the shaft of the second roller W1‧‧‧The first roller W2‧‧‧The width of the second roller

[0021] 　　 [FIG. 1] FIG. 1, a front view of a plate glass manufacturing device.　　[Figure 2] Figure 2, a side view of the plate glass manufacturing device.　　[Figure 3] Figure 3 is a cross-sectional view of the roller and shaft.　　[Fig. 4] Fig. 4 is a front view of a plate glass manufacturing device that illustrates a procedure of a plate glass manufacturing method.　　[Fig. 5] Fig. 5 is a front view of a plate glass manufacturing apparatus that illustrates a procedure of a plate glass manufacturing method.　　[Fig. 6] Fig. 6 is a side view of a plate glass manufacturing apparatus that illustrates a procedure of a plate glass manufacturing method.　　[Fig. 7] Fig. 7 is a front view of a plate glass manufacturing apparatus that illustrates a procedure of a plate glass manufacturing method.　　[Fig. 8] Fig. 8 is a front view of a plate glass manufacturing apparatus that illustrates a procedure of a plate glass manufacturing method.　　[Fig. 9] Fig. 9 is a side view of a plate glass manufacturing apparatus that illustrates a procedure of a plate glass manufacturing method.

1‧‧‧Plate glass manufacturing equipment

2‧‧‧Forming furnace

3‧‧‧Annealing furnace

4‧‧‧Formed body

4a‧‧‧End

4b‧‧‧End

4c‧‧‧Central part

5‧‧‧Edge Roller

6‧‧‧Overflow ditch

7‧‧‧Vertical face

8‧‧‧Slanted face

9‧‧‧Lower end

10‧‧‧The first roller

10a‧‧‧The shaft of the first roller

11‧‧‧Second Roller

11a‧‧‧The shaft of the second roller

12‧‧‧The third roller

12a‧‧‧The third roller shaft

13‧‧‧The fourth roller

13a‧‧‧The shaft of the fourth roller

D1‧‧‧Separation distance

D2‧‧‧Separation distance

D3‧‧‧Separation distance

D4‧‧‧Separation distance

GM‧‧‧Molten glass

GR‧‧‧Plate glass

GRa‧‧‧End

GRb‧‧‧End

GRc‧‧‧Central Department

L1‧‧‧The length of the shaft of the first roller

L2‧‧‧The length of the shaft of the second roller

L3‧‧‧The length of the shaft of the third roller

L4‧‧‧The length of the shaft of the fourth roller

W1‧‧‧The width of the first roller

W2‧‧‧The width of the second roller

W3‧‧‧The width of the third roller

W4‧‧‧The width of the fourth roller

X‧‧‧Width direction

Claims (8)

A method for manufacturing plate glass, which is to make molten glass flow down from a formed body to form plate glass, and to pull the plate glass through a plurality of rollers up and down to continuously manufacture the plate glass. A set of first rollers separated in the width direction of the formed body below the formed body, and a set of first rollers arranged below the first roller and separated in the width direction of the formed body The second roller, at the beginning of the continuous production of the plate glass, is provided with the following procedures: a part of the molten glass is suspended from the molded body into a glass block; in order to sandwich the glass block through the first roller, the first The separation distance in the width direction of one roller is set to be smaller than the separation distance in the width direction of the second roller; and the glass block is clamped by the first roller and the second roller to be deformed into a plate shape. The method for manufacturing a plate glass according to claim 1, wherein the first roller is configured to have a shaft portion that supports the first roller, and is movable in the axial direction of the shaft portion. The method for manufacturing plate glass according to claim 2, wherein the aforementioned first roller After clamping the glass block, it moves to the position of the end part of the width direction of the said molded object so that it may become the same position as the said 2nd roller. The method for manufacturing a plate glass according to claim 1 or 2, wherein after the second roller clamps the end in the width direction of the plate glass, the first roller is separated so as not to contact the plate glass. The method for manufacturing a plate glass according to any one of claims 1 to 3, wherein the pressure at which the first roller clamps the glass block is set to be greater than the pressure at which the second roller clamps the plate glass. The method for manufacturing a plate glass according to claim 2 or 3, wherein the second roller has a shaft portion supporting the second roller, and the length of the shaft portion of the first roller is set to be longer than that of the shaft portion of the second roller. The length is long. The method for manufacturing a plate glass according to any one of claims 1 to 3, wherein the width of the first roller is set to be larger than the width of the second roller. A plate glass manufacturing apparatus including a molded body that hangs a part of molten glass into a glass lump and shapes the molten glass into a plate glass, and a plurality of upper and lower rollers arranged below the molded body and pulls the plate glass Furthermore, the aforementioned roller includes the A set of first rollers separated in the width direction of the body, and a set of second rollers arranged below the first roller and separated in the width direction of the molded body, the rollers having the The separation distance in the width direction of the first roller is set to be smaller than the separation distance in the width direction of the second roller, and the first roller and the second roller are configured to be able to pinch the glass block. It is deformed into a plate shape.

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