Glass article manufacturing device and manufacturing method thereof

Abstract

A forming device (1) comprises: a forming body (2); and a guide member (10) provided at the lower part of both ends of the forming body (2) in the width direction. The forming body (2) has first and second inclined forming surfaces (6) for causing molten glass (Gm) to flow down. The guide member (10) comprises: a first inclined guide surface (12) for guiding a part of the molten glass (Gm) along the first inclined forming surface (6); a second inclined guide surface (12) for guiding a part of the molten glass (Gm) along the second inclined forming surface (6); and a resistance heating heater (15) for heating the molten glass (Gm) flowing down the first and second inclined guide surfaces (12) from the back side.

Description

Technical Field

[0001] The present invention relates to improvements in techniques for making glass articles utilizing the overflow down-draw process. Background Art

[0002] As a method for manufacturing glass products such as glass sheets, an overflow down-draw method is sometimes used. In this method, a forming device has a roughly wedge-shaped forming body. After the molten glass supplied to the forming body overflows from the groove formed on the top of the forming body, it merges at the lower end along the inclined forming surfaces formed on the two side surfaces of the forming body. Thus, a ribbon-shaped glass ribbon is continuously formed from the molten glass. According to this method, the front and back sides of the formed glass ribbon do not contact the forming body during the forming process, so there is an advantage that a smooth glass ribbon without damage on the front and back sides can be formed (for example, refer to patent document 1).

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2012-214349 Summary of the invention

[0006] Problems to be solved by the invention

[0007] In the case of the overflow down-draw method, the molten glass sometimes becomes devitrified when cooled at the lower ends of the two ends of the forming body in the width direction, and devitrified objects are formed. The devitrified objects grow over time and may become obstacles that hinder the flow path of the molten glass. When the devitrified objects grow to become obstacles, there is a situation where a part of the molten glass is separated from the mainstream of the molten glass along the devitrified objects, and is cooled and solidified in a state of hanging from the lower end of the forming body to form glass balls. In addition, when the glass balls fall, it becomes a cause of major failures such as damage to the manufacturing device and the glass ribbon.

[0008] In addition, due to devitrified matter, various defects such as wrinkles may occur in the glass ribbon.

[0009] An object of the present invention is to stably shape a glass ribbon while suppressing devitrification of molten glass at lower end portions of both ends in the width direction of a forming body.

[0010] Solutions to Solve Problems

[0011] The present invention made to solve the above-mentioned problems is a manufacturing device for glass articles, which is equipped with a forming device for forming a glass ribbon from molten glass using an overflow down-draw method. The manufacturing device for glass articles is characterized in that the forming device comprises: a forming body; and a guiding member, which is respectively arranged at the lower part of the two ends of the width direction of the forming body, the forming body having: a first inclined forming surface, which makes the molten glass flow down; and a second inclined forming surface, which intersects with the first inclined forming surface at the lower end of the forming body and makes the molten glass flow down on the opposite side of the first inclined forming surface, the guiding member having: a first inclined guiding surface, which guides a part of the molten glass along the first inclined forming surface; a second inclined guiding surface, which intersects with the first inclined guiding surface at the lower end of the forming body and guides a part of the molten glass along the second inclined forming surface; and a resistance heating heater, which heats the molten glass flowing down the first inclined guiding surface and the second inclined guiding surface from the back side.

[0012] Here, in order to suppress the devitrification of molten glass at the lower end of the two ends of the forming body in the width direction, it is considered to heat the molten glass in this area. However, when the guide member is energized for heating, the temperature of the two ends of the glass ribbon in the width direction rises excessively and the temperature distribution becomes uneven, which may cause wrinkles in the glass ribbon. In addition, when induction heating is used, the metal around the coil used in the induction heating is all heated, and there is a problem that it is difficult to selectively heat only the required parts. Therefore, in the present invention, a resistance heating heater is used to heat the molten glass at the lower end of the two ends of the forming body in the width direction. If it is a resistance heating heater, the heat generation and the heating part can be adjusted by the thickness and width of the heater, and the required part can be efficiently heated. Therefore, the devitrification of the molten glass at the lower end of the two ends of the forming body in the width direction can be suppressed, and the glass ribbon can be stably formed.

[0013] In the above-mentioned configuration, the formed body may have a cutout portion at the lower portion of both ends in the width direction, and the heater may be arranged in the cutout portion.

[0014] In this way, it is possible to easily secure a space for arranging the heater.

[0015] When the heater is arranged at the missing portion, the heater preferably includes a first heating portion arranged at the back side of the first inclined guide surface and a second heating portion arranged at the back side of the second inclined guide surface.

[0016] In this manner, the molten glass flowing down the first inclined guide surface and the molten glass flowing down the second inclined guide surface can be efficiently heated.

[0017] When the heater is arranged in the missing portion, it is preferable that the first heating portion and the second heating portion are continuous at the lower end portion of the formed body.

[0018] In this manner, the molten glass can be efficiently heated at the lower end portions of both ends in the width direction of the forming body where devitrification of the molten glass is likely to occur.

[0019] When the heater is arranged in the missing portion, the guide member preferably has a back guide surface that guides the molten glass intruding into the back side of the first inclined guide surface and / or the back side of the second inclined guide surface along the missing portion.

[0020] In this manner, the molten glass that has intruded into the interior of the guide member can be efficiently guided.

[0021] When the heater is disposed in the missing portion, it is preferable that a refractory brick for holding the heater is disposed in the missing portion.

[0022] In this way, the heater can be stably held in the missing portion.

[0023] When the heater is disposed in the missing portion, it is preferable that an insulating layer containing cement is formed between the heater and the guide member.

[0024] In this way, the insulation between the heater and the guide member is maintained, so the heater can generate heat efficiently. In addition, the heater can also be reliably fixed to the refractory bricks using cement.

[0025] In the above structure, the heater may also include: a first heating part, which is arranged on the back side of the first inclined guide surface; and a second heating part, which is arranged on the back side of the second inclined guide surface, and the guide member may include: a first groove part, which accommodates the first heating part between the first inclined forming surface and the first inclined guide surface; and a second groove part, which accommodates the second heating part between the second inclined forming surface and the second inclined guide surface.

[0026] In this way, there is no need to provide a cutout portion in the molded body for arranging the heater. As a result, both ends in the width direction of the molded body can be appropriately pressed to the lower end, and an increase in creep deformation of the molded body can be suppressed.

[0027] When the heater is disposed in the recessed groove, the guide member preferably has a connecting portion connecting the first recessed groove and the second recessed groove at the lower end of the molded body, and the first heating portion and the second heating portion are continuous through the connecting portion.

[0028] In this manner, the molten glass can be efficiently heated at the lower end portions of both ends in the width direction of the forming body where devitrification of the molten glass is likely to occur.

[0029] When the heater is arranged in the groove portion, preferably, the guide member has a fin hanging down from the first inclined guide surface and the second inclined guide surface at the lower end of the forming body and guiding the molten glass, and the fin extends into the inside of the connecting portion in a part of the width direction of the connecting portion.

[0030] In this manner, the fins function as ribs that increase the rigidity of the communicating portion, and thus deformation of the guide member can be prevented.

[0031] When the heater is disposed in the recessed groove portion, it is preferable that an insulating layer composed of a thermal spray film is formed between the heater and the guide member.

[0032] In this manner, since insulation between the heater and the guide member can be achieved without hindering heat conduction from the heater to the guide member, the molten glass can be efficiently heated.

[0033] The present invention made to solve the above-mentioned problems is a method for manufacturing a glass article, including a forming step of forming a glass ribbon from molten glass using a forming device and an overflow down-draw method. The method for manufacturing the glass article is characterized in that the forming device comprises: a forming body; and a guiding member, which is respectively arranged at the lower part of the two ends of the width direction of the forming body, the forming body having: a first inclined forming surface, which makes the molten glass flow down; and a second inclined forming surface, which intersects with the first inclined forming surface at the lower end of the forming body and makes the molten glass flow down on the opposite side of the first inclined forming surface, the guiding member having: a first inclined guiding surface, which guides a part of the molten glass along the first inclined forming surface; and a second inclined guiding surface, which intersects with the first inclined guiding surface at the lower end of the forming body and guides a part of the molten glass along the second inclined forming surface, and in the forming step, the molten glass flowing down the first inclined guiding surface and the second inclined guiding surface is heated from the back side by a resistance heating heater.

[0034] In this way, the same effects as those of the corresponding structures described above can be achieved.

[0035] Effects of the Invention

[0036] According to the present invention, it is possible to stably form a glass ribbon while suppressing devitrification of molten glass at the lower end portions of both ends in the width direction of the forming body. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a front view showing a forming device included in the manufacturing device of a glass article according to the first embodiment of the present invention.

[0038] Figure 2 yes Figure 1 AA cross-sectional view of the forming device shown.

[0039] Figure 3 Yes Figure 1 A partially enlarged front view of the forming device shown with its components exploded and arranged.

[0040] Figure 4 yes Figure 1 A partially enlarged front view of the forming device shown.

[0041] Figure 5 yes Figure 4 BB cross-sectional view of the forming device shown.

[0042] Figure 6 yes Figure 1 An expanded view of a resistive heating heater included in the forming apparatus shown.

[0043] Figure 7 yes Figure 4 A BB cross-sectional view of a modified example of the forming device shown.

[0044] Figure 8 This is a front view showing a forming device included in a manufacturing device for a glass article according to a second embodiment of the present invention.

[0045] Fig. 9 It is shown Figure 8 A three-dimensional view of a guide member included in the forming device shown.

[0046] Fig.10 yes Figure 8 CC cross-sectional view of the forming device shown.

[0047] Fig.11 yes Figure 8 DD cross-sectional view of the forming device shown. DETAILED DESCRIPTION

[0048] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. It should be noted that, in the orthogonal coordinate system composed of XYZ shown in the figure, the X direction and the Y direction are horizontal directions, and the Z direction is a vertical direction. In addition, the direction corresponding to the width direction of the formed glass ribbon G is referred to as the width direction X, and the direction corresponding to the thickness direction of the formed glass ribbon G is referred to as the thickness direction Y. Moreover, the same reference numerals are given to the corresponding components in each embodiment, so that repeated descriptions are sometimes omitted. In the case where only a part of the structure is described in each embodiment, the structure of other embodiments described previously can be applied to the other parts of the structure. In addition, not only the combination of the structures explicitly described in the description of each embodiment, but also the structures of multiple embodiments can be partially combined with each other even if not explicitly stated, as long as there is no particular obstacle to the combination.

[0049] (First Embodiment)

[0050] exist Figure 1 to Figure 7 In the figure, a manufacturing apparatus for glass articles according to the first embodiment is illustrated. Figure 1 as well as Figure 2 As shown in FIG. 1 , the present manufacturing apparatus includes a forming device 1 for forming molten glass Gm supplied from a melting furnace (not shown) into a ribbon-shaped glass ribbon G by an overflow down-draw method.

[0051] The forming device 1 includes a forming body 2 arranged inside a forming chamber (not shown). The forming device 1 further includes an annealing chamber for annealing the glass ribbon G, a cooling chamber for cooling the glass ribbon G, and a cutting chamber for cutting the glass ribbon G into a predetermined size to obtain a glass plate as a glass article, below the forming chamber. The obtained glass plate is used, for example, as a glass substrate or cover glass for a display.

[0052] The formed body 2 is formed of a refractory material that is elongated along the width direction X of the formed glass ribbon G. In this specification, the width direction of the formed body 2 means the same direction as the width direction X of the glass ribbon G to be formed.

[0053] A groove (overflow groove) 3 formed along the width direction X is provided on the top of the forming body 2. A supply pipe (not shown) is connected to one end side of the groove 3 in the width direction X. The molten glass Gm is supplied to the groove 3 through the supply pipe. The supply method of the molten glass Gm is not limited thereto. For example, the molten glass Gm may be supplied from both end sides of the groove 3 in the width direction X, or from the top of the groove 3.

[0054] The formed body 2 is symmetrical in the thickness direction Y. The two outer side surfaces (the first outer side surface and the second outer side surface) 4 in the thickness direction Y of the formed body 2 respectively have vertical forming surfaces (the first vertical forming surface and the second vertical forming surface) 5 in the shape of a plane along the vertical direction and inclined forming surfaces (the first inclined forming surface and the second inclined forming surface) 6 connected to the bottom of the vertical forming surface 5 and in the shape of a plane inclined relative to the vertical direction. Each vertical forming surface 5 is a surface parallel to each other. Each inclined forming surface 6 is a surface inclined in a manner that approaches each other in the thickness direction Y as it moves downward. That is, the formed body 2 is formed by forming each inclined forming surface 6, so that when viewed from the width direction X, it is a wedge shape that becomes thinner at the front end toward the bottom, and the corner where each inclined forming surface 6 intersects forms the lower end 2a of the formed body 2. It should be noted that the vertical forming surface 5 can be changed in shape to an inclined surface, a curved surface, etc., or it can be omitted.

[0055] like Figure 1 as well as Figure 2As shown, restricting members 7 for restricting the spread of the molten glass Gm flowing down the vertical molding surface 5 and the inclined molding surface 6 are provided at both ends of the molding body 2 in the width direction X.

[0056] The limiting member 7 is formed of, for example, platinum or a platinum alloy.

[0057] In the present embodiment, the limiting surface 8 of the limiting member 7 is composed of a plane that is perpendicular to the vertical forming surface 5 and the inclined forming surface 6 and extends straight downward. That is, the limiting surface 8 is a plane along the YZ plane. The limiting member 7 is fixed in a state where it is respectively embedded in the two end portions of the width direction X of the formed body 2. In detail, the end portions of the width direction X of the formed body 2 are embedded in the fitting recess 9 provided in the limiting member 7. It should be noted that the fixing method of the limiting member 7 is not limited to this. For example, the limiting member 7 can also be fixed to the formed body 2 by a pin or the like.

[0058] like Figure 1 as well as Figure 2 As shown, guide members 10 are provided at the lower part of both ends of the forming body 2 in the width direction X so as to cover a part of the lower end 2a (lower end 6a of the inclined forming surface 6) of the forming body 2 from below. The guide members 10 have the function of guiding a part of the molten glass Gm that normally flows down the inclined forming surface 6 of the forming body 2 along the inclined forming surface 6, and the function of discharging the molten glass Gm that intrudes into the fitting recess 9 from the gap between the forming body 2 and the limiting member 7 in the F direction at the lower end 2a of the forming body 2 and merging it with the molten glass Gm that normally flows down along the inclined forming surface 6 of the forming body 2.

[0059] The guide member 10 is formed of the same material as the restricting member 7 (for example, platinum or a platinum alloy).

[0060] The guide member 10 includes a vertical guide surface 11 along the restriction surface 8 of the restriction member 7, an inclined guide surface 12 along the inclined molding surface 6 of the molded body 2, and a fin 13 hanging down from the inclined guide surface 12 at the lower end 2a of the molded body 2. The fin 13 is a plate-like body extending in the vertical direction Z.

[0061] The guide member 10 is a single member formed by integrating the vertical guide surface 11, the inclined guide surface 12 and the fin 13. In the present embodiment, the guide member 10 is fixed to the limiting member 7 by welding the vertical guide surface 11 to the limiting surface 8 of the limiting member 7. It should be noted that the fixing method of the guide member 10 is not limited to this. For example, the guide member 10 can also be fixed to the inclined forming surface 6.

[0062] The inclined guide surface 12 is V-shaped in accordance with the shape of the lower end 2a of the molded body 2 and covers a portion of the lower end 2a and a portion of each inclined molded surface 6. The inclined guide surface 12 is formed so that the dimension in the width direction X becomes longer toward the lower end side of the guide member 10.

[0063] The thickness of the vertical guide surface 11 is, for example, 0.5 to 3 mm. The thickness of the inclined guide surface 12 is, for example, 0.5 to 3 mm. The thickness of the fin 13 is, for example, 0.5 to 10 mm, and the dimension of the fin 13 in the width direction X is, for example, 10 to 100 mm.

[0064] In this embodiment, the fins 13 are provided only at both ends in the width direction of the lower end 6a of the inclined forming surface 6, but the present invention is not limited thereto. For example, the fins 13 may be provided over the entire area of ​​the lower end 6a of the inclined forming surface 6. Alternatively, the fins 13 may be omitted.

[0065] like Figure 1 As shown, in the present embodiment, the forming body 2 has a missing portion 14 formed by the lack of a part of the refractory constituting the forming body 2 at the lower part of both ends in the width direction X. The missing portion 14 is formed at a position corresponding to the inclined guide surface 12 of the guide member 10 and the lower part of the limiting member 7. A resistance heating heater (for example, a heater made of platinum, platinum alloy, nickel-chromium, iron-chromium, carbon, silicon carbide, etc.) 15 is arranged in the missing portion 14 (a space formed by the lack of a part of the refractory) to heat the molten glass Gm flowing down each inclined guide surface 12 from the back side. If the heater 15 is a resistance heating heater, the heat generation and the heating part can be easily adjusted by its thickness and width, so the required part can be efficiently heated. Therefore, the devitrification of the molten glass Gm at the lower end 2a of both ends of the width direction X of the forming body 2 can be suppressed, and the glass ribbon G can be stably formed.

[0066] like Figure 3 to Figure 5 As shown in FIG. 1 , a refractory brick 16 for holding the heater 15 is disposed in the missing portion 14. In the present embodiment, the refractory brick 16 has a shape corresponding to the missing portion 14 (a wedge shape tapering toward the bottom when viewed from the width direction X), and the heater 15 is fixed to the surface thereof using an insulating layer 17 containing cement. Figure 5 As shown, the heater 15 is held in a state sandwiched between the refractory bricks 16 and the insulating layer 17, and the heater 15 does not directly contact the guide member 10 (or the guide member 10 and the limiting member 7). In this way, when the heater 15 is energized, the guide member 10 does not leak electricity, and the heater 15 can generate heat efficiently.

[0067] The insulating layer 17 made of cement is formed of, for example, mortar or concrete.

[0068] The insulating layer 17 may be formed entirely or partially in the region where the heater 15 is disposed, as long as insulation between the guide member 10 (or the guide member 10 and the restricting member 7 ) and the heater 15 can be maintained.

[0069] In the present embodiment, an opening 18 is provided at the lower portion of the outer end portion of the limiting member 7 in the width direction X, and the refractory bricks 16 are received in the inside of the guide member 10 (between the inclined guide surfaces 12) through the opening 18, so that the refractory bricks 16 can be arranged in the missing portion 14. It should be noted that the refractory bricks 16 and / or the insulating layer 17 may be omitted in a state where the heater 15 is arranged in the missing portion 14. Alternatively, as the insulating layer 17, an insulating layer composed of a sprayed film described later may be used.

[0070] like Figure 3 as well as Figure 4 As shown, the guide member 10 includes a back guide surface 19 for guiding the molten glass Gm intruding into the back side of each inclined guide surface 12 along the missing portion 14. The back guide surface 19 is inclined in a manner that approaches the center side of the width direction X as it approaches downward. Therefore, the molten glass Gm guided by the back guide surface 19 gradually moves to the center side of the width direction X in accordance with the inclination of the back guide surface 19. In addition, at the lower end portion 2a of the forming body 2, the molten glass Gm guided by the back guide surface 19 flows from the gap between the guide member 10 and the forming body 2 to merge with the molten glass Gm that normally flows down along the inclined forming surface 6 of the forming body 2. Figure 4 The discharge direction is F.

[0071] like Figure 4 As shown, in this embodiment, the molded body 2, the restricting member 7, the guide member 10, and the refractory bricks 16 are assembled with each other, and a gap S is formed between the missing portion 14 of the molded body 2 and the back side guide surface 19. The gap S is a gap for absorbing the difference in dimensional accuracy between the missing portion 14 of the molded body 2 and the back side guide surface 19. Therefore, the missing portion 14 is not pressed from the outside in the width direction X.

[0072] like Figure 5As shown, the heater 15 includes a heating portion (first heating portion) 20 disposed on the back side of one of the pair of inclined guide surfaces 12 and a heating portion (second heating portion) 20 disposed on the back side of the other of the pair of inclined guide surfaces 12. Each heating portion 20 is disposed substantially parallel to each inclined guide surface 12. The heating portion 20 disposed on the back side of one inclined guide surface 12 and the heating portion 20 disposed on the back side of the other inclined guide surface 12 are continuous at the lower end 2a of the forming body 2. The continuous portion 21 of the heater 15 is V-shaped in the shape of the lower end 16a of the refractory brick 16 (the lower end 2a of the forming body 2). In the present embodiment, the continuous portion 21 is formed at a position corresponding to the outer end of the lower end of the inclined guide surface 12 in the width direction X. In this way, the molten glass Gm can be efficiently heated at the lower end 2a of the both ends of the forming body 2 in the width direction X where devitrification of the molten glass Gm is likely to occur.

[0073] like Figure 6 As shown in FIG. 1 , the heater 15 is a strip-shaped body that meanders in a manner capable of heating substantially the entire surface of the inclined guide surface 12. The heater 15 is folded in half at the center line L, thereby bending from one inclined guide surface 12 side to the other inclined guide surface 12 side. That is, the bent portion of the heater 15 becomes the above-mentioned continuous portion 21. Specifically, one end and the other end of the folded heater 15 are located above the lower end 2a of the formed body 2, and the central portion (continuous portion 21) of the heater 15 is located around the lower end 2a of the formed body 2.

[0074] It should be noted that the configuration of the heater 15 is not limited to this. For example, one end and the other end of the heater 15 may be located around the lower end 2a of the formed body 2, and the central portion (continuous portion 21) of the heater 15 may be located above the lower end 2a of the formed body.

[0075] In addition, for example, Figure 7 As shown, a vertical portion 22 along the vertical direction may be provided in a part of the heater 15 in the insulating layer 17 below the lower end 16a of the refractory brick 16. In this way, the molten glass Gm flowing down each inclined guide surface 12 can be heated simultaneously by one vertical portion 22. It should be noted that the vertical portion 22 can be applied to (1) a scheme in which one end and the other end of the above-mentioned heater 15 are located above the lower end 2a of the forming body 2 and the central portion (continuous portion 21) of the heater 15 is located around the lower end 2a of the forming body 2 and (2) a scheme in which one end and the other end of the above-mentioned heater 15 are located around the lower end 2a of the forming body 2 and the central portion (continuous portion 21) of the heater 15 is located above the lower end 2a of the forming body 2.

[0076] Furthermore, the heater 15 may not include the continuous portion 21 but may include the heating portion 20 disposed on the back side of one inclined guide surface 12 and the heating portion 20 disposed on the back side of the other inclined guide surface 12 as separate circuits.

[0077] The manufacturing method of the glass article of the present embodiment includes a forming step of forming a glass ribbon G from molten glass Gm by an overflow down-draw method using the above-mentioned forming apparatus 1. In the forming step, after the molten glass Gm supplied to the groove portion 3 overflows from the groove portion 3, it flows along each outer side surface 4 and merges at the lower end portion 2a of the forming body 2. Thus, the glass ribbon G is continuously formed from the molten glass Gm.

[0078] (Second Embodiment)

[0079] exist Figure 8 to Figure 11 In the second embodiment, a manufacturing apparatus for glass articles is illustrated. In this embodiment, a structure in which a heater 15 is arranged instead of a missing portion 14 is illustrated in the molded body 2. Fig.10 as well as Fig.11 In the figure, the vertical guide surface 11 is omitted for convenience.

[0080] like Fig.10 as well as Fig.11 As shown, the heater 15 includes heating units (first heating unit and second heating unit) 20 arranged on the back side of each inclined guide surface (first inclined guide surface and second inclined guide surface) 12 similarly to the first embodiment.

[0081] like Figure 8 to Figure 11 As shown, the guide member 10 includes: a groove portion (first groove portion) 23 for accommodating a heating portion (first heating portion) 20 between one inclined forming surface 6 and one inclined guide surface 12 corresponding to the one inclined forming surface 6; and a groove portion (second groove portion) 23 for accommodating a heating portion (second heating portion) 20 between the other inclined forming surface 6 and the other inclined guide surface 12 corresponding to the other inclined forming surface 6. In this way, it is not necessary to provide a missing portion 14 in the molded body 2 for arranging the heater 15, so that both ends of the molded body 2 in the width direction X can be appropriately pressed to the lower end portion 2a, and the increase of creep deformation of the molded body 2 can be suppressed.

[0082] like Figure 8 to Figure 11As shown, the region R1 where the groove 23 is formed in the inclined guide surface 12 is raised than the region R2 where the groove 23 is not formed. However, the region R1 where the groove 23 is formed is set to have a raised height, a raised shape (for example, a shape in which the region R1 and the region R2 are continuous via a convex curved surface), etc. in a manner that does not negatively affect the flow of the molten glass Gm. In the present embodiment, the region R1 and the region R2 are parallel planes, and the raised height (the distance from the plane of the region R1 to the plane of the region R2) is, for example, about 1 mm to 3 mm.

[0083] like Fig. 9 as well as Fig.10 As shown in FIG. 1 , the guide member 10 has a connecting portion 24 that connects the groove portions 23 to each other at the lower end portion 2a of the molded body 2. The continuous portions 21 of the heating portions 20 are connected through the connecting portion 24. In the present embodiment, the connecting portion 24 and the continuous portion 21 are formed at a position corresponding to the outer end portion of the lower end portion of the inclined guide surface 12 in the width direction X ( Figure 8 In this way, the molten glass Gm can be efficiently heated at the lower end portions 2a at both ends in the width direction X of the forming body 2 where devitrification of the molten glass Gm is likely to occur.

[0084] like Fig.11 As shown, the fin 13 extends to the inside of the communicating portion 24 in a part of the width direction X of the communicating portion 24. In the present embodiment, the fin 13 inside the communicating portion 24 is formed in a region other than a position corresponding to the outer end of the lower end of the inclined guide surface 12 in the width direction X of the communicating portion 24. The fin 13 inside the communicating portion 24 is arranged across the upper and lower wall surfaces of the groove portion 23 in a manner to block the communicating portion 24. Thus, the fin 13 functions as a rib that increases the rigidity of the communicating portion 24, and thus deformation of the guide member 10 can be prevented.

[0085] As in Fig.11 As shown in the enlarged view in FIG. 1 , an insulating layer 25 composed of a sprayed film is formed between the heater 15 and the guide member 10. Specifically, the insulating layer 25 is formed on the surface of the heater 15. If the insulating layer 25 composed of a sprayed film is formed in this way, insulation between the heater 15 and the guide member 10 can be achieved without hindering heat conduction from the heater 15 to the guide member 10, so that the molten glass Gm can be efficiently heated.

[0086] The insulating layer 25 is formed of, for example, a thermally sprayed film of aluminum oxide-zirconia, a thermally sprayed film of aluminum oxide, or a thermally sprayed film of zirconium oxide.

[0087] The insulating layer 25 may be formed on the entire surface of the heater 15 or partially formed on the surface of the heater 15 as long as it can maintain insulation between the guide member 10 and the heater 15. In the present embodiment, the insulating layer 25 is formed on the entire surface of the heater 15, and insulation between the heater 15 and the limiting member 7 is maintained. It should be noted that the insulating layer 25 may also be omitted.

[0088] The present invention is not limited to the configuration of the above-described embodiment, nor is it limited to the above-described effects. The present invention can be modified in various ways without departing from the gist of the present invention.

[0089] In the above-mentioned embodiment, the case where the glass article is a glass plate has been described, but the glass article may be, for example, a glass roll in which the glass ribbon G is wound around a winding core or the like in a roll shape.

[0090] Description of Reference Numerals

[0091] 1 Forming device

[0092] 2 formed body

[0093] 4 Outer side

[0094] 5 Vertical forming surface

[0095] 6 Inclined forming surface

[0096] 7 Limiting components

[0097] 8 Restricted surfaces

[0098] 9 Fitting recess

[0099] 10. Guide component

[0100] 11 Vertical guide surface

[0101] 12 Inclined guide surface

[0102] 13 Fins

[0103] 14 Missing parts

[0104] 15. Resistance Heating Heater

[0105] 16 Refractory Bricks

[0106] 17 Insulation layer

[0107] 18 Opening

[0108] 19 Back side guide surface

[0109] 20 Heating unit

[0110] 21 Continuation

[0111] 23 Groove

[0112] 24 Connecting part

[0113] 25 Insulation layer.

Claims

1. A manufacturing device for glass articles, comprising a forming device for forming a glass ribbon from molten glass by an overflow down-draw method, The manufacturing device of the glass article is characterized in that: The forming device comprises: a forming body; and guide members, which are respectively provided at the lower part of both ends of the forming body in the width direction. The forming body has: a first inclined forming surface that allows the molten glass to flow downward; and a second inclined forming surface that intersects with the first inclined forming surface at a lower end of the forming body and allows the molten glass to flow downward on the opposite side of the first inclined forming surface. The guide member comprises: a first inclined guide surface for guiding a portion of the molten glass along the first inclined forming surface; a second inclined guide surface for intersecting with the first inclined guide surface at the lower end of the forming body and guiding a portion of the molten glass along the second inclined forming surface; and a resistance heating heater for heating the molten glass flowing down the first inclined guide surface and the second inclined guide surface from the back side. The molded body has missing parts at the lower parts of both ends in the width direction, The guide member has a rear guide surface configured to guide the molten glass intruding into the rear side of the first inclined guide surface and / or the rear side of the second inclined guide surface along the missing portion.

2. The manufacturing device for glass articles according to claim 1, wherein: The heater is disposed at the missing portion.

3. The manufacturing device for glass articles according to claim 2, wherein: The heater includes a first heating portion disposed on a back side of the first inclined guide surface and a second heating portion disposed on a back side of the second inclined guide surface.

4. The manufacturing device for glass articles according to claim 3, wherein: The first heating portion and the second heating portion are continuous at the lower end portion of the formed body.

5. The manufacturing device for a glass article according to any one of claims 1 to 4, wherein: Refractory bricks for holding the heater are arranged in the missing portion.

6. The manufacturing device for glass articles according to claim 5, wherein: An insulating layer including cement is formed between the heater and the guide member.

7. A manufacturing device for glass articles, comprising a forming device for forming a glass ribbon from molten glass by an overflow down-draw method, The manufacturing device of the glass article is characterized in that: The forming device comprises: a forming body; and guide members, which are respectively provided at the lower part of both ends of the forming body in the width direction. The forming body has: a first inclined forming surface that allows the molten glass to flow downward; and a second inclined forming surface that intersects with the first inclined forming surface at a lower end of the forming body and allows the molten glass to flow downward on the opposite side of the first inclined forming surface. The guide member comprises: a first inclined guide surface for guiding a portion of the molten glass along the first inclined forming surface; a second inclined guide surface for intersecting with the first inclined guide surface at the lower end of the forming body and guiding a portion of the molten glass along the second inclined forming surface; and a resistance heating heater for heating the molten glass flowing down the first inclined guide surface and the second inclined guide surface from the back side. The heater includes: a first heating portion disposed on the back side of the first inclined guide surface; and a second heating portion disposed on the back side of the second inclined guide surface. The guide member includes a first groove portion for accommodating the first heating portion between the first inclined forming surface and the first inclined guide surface, and a second groove portion for accommodating the second heating portion between the second inclined forming surface and the second inclined guide surface.

8. The manufacturing device for glass articles according to claim 7, wherein: The guide member has a connecting portion connecting the first groove portion and the second groove portion at the lower end portion of the molded body. The first heating portion and the second heating portion are connected to each other through the communication portion.

9. The manufacturing device for glass articles according to claim 8, wherein: The guide member includes a fin that hangs down from the first inclined guide surface and the second inclined guide surface at the lower end of the forming body and guides the molten glass. The fin extends into the interior of the communicating portion in a portion in the width direction of the communicating portion.

10. The manufacturing device for a glass article according to any one of claims 7 to 9, wherein: An insulating layer composed of a thermal spray film is formed between the heater and the guide member.

11. A method for manufacturing a glass article, comprising a forming step of forming a glass ribbon from molten glass using an overflow down-draw method using a forming device, The method for manufacturing the glass article is characterized in that: The forming device comprises: a forming body; and guide members, which are respectively provided at the lower part of both ends of the forming body in the width direction. The forming body has: a first inclined forming surface that allows the molten glass to flow downward; and a second inclined forming surface that intersects with the first inclined forming surface at a lower end of the forming body and allows the molten glass to flow downward on the opposite side of the first inclined forming surface. The guide member comprises: a first inclined guide surface, which guides a portion of the molten glass along the first inclined forming surface; and a second inclined guide surface, which intersects with the first inclined guide surface at a lower end of the forming body and guides a portion of the molten glass along the second inclined forming surface. In the forming step, the molten glass flowing down the first inclined guide surface and the second inclined guide surface is heated from the back side by a resistance heating heater. The molded body has missing parts at the lower parts of both ends in the width direction, The guide member has a rear guide surface configured to guide the molten glass intruding into the rear side of the first inclined guide surface and / or the rear side of the second inclined guide surface along the missing portion.

12. A method for manufacturing a glass article, comprising a forming step of forming a glass ribbon from molten glass using an overflow down-draw method using a forming device, The method for manufacturing the glass article is characterized in that: The forming device comprises: a forming body; and guide members, which are respectively provided at the lower part of both ends of the forming body in the width direction. The forming body has: a first inclined forming surface that allows the molten glass to flow downward; and a second inclined forming surface that intersects with the first inclined forming surface at a lower end of the forming body and allows the molten glass to flow downward on the opposite side of the first inclined forming surface. The guide member comprises: a first inclined guide surface, which guides a portion of the molten glass along the first inclined forming surface; and a second inclined guide surface, which intersects with the first inclined guide surface at a lower end of the forming body and guides a portion of the molten glass along the second inclined forming surface. In the forming step, the molten glass flowing down the first inclined guide surface and the second inclined guide surface is heated from the back side by a resistance heating heater. The heater includes: a first heating portion disposed on the back side of the first inclined guide surface; and a second heating portion disposed on the back side of the second inclined guide surface. The guide member includes a first groove portion for accommodating the first heating portion between the first inclined forming surface and the first inclined guide surface, and a second groove portion for accommodating the second heating portion between the second inclined forming surface and the second inclined guide surface.

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