TWI666184B - Discharge structure of heterogeneous base material of molten glass, manufacturing device and manufacturing method of glass article - Google Patents

Abstract

An object of the present invention is to provide a technique for removing a heterogeneous matrix material from a defoamed molten glass.

The present invention is a heterogeneous base material discharge structure for molten glass. A clarification tank having an inlet portion and an outlet portion of the molten glass and used for defoaming the molten glass discharges the molten glass, and the molten glass is transferred to a duct of a forming mechanism The first discharge port is formed to discharge a part of the molten glass flowing in the duct, and the first discharge port has a discharge pipe connected to the first discharge port and moving the molten glass downward, and The first discharge port is formed at the top of the cross section of each duct in the above-mentioned horizontal or inclined duct, and in the above-mentioned duct extending vertically, it is formed with respect to the cross-section of the duct On the side farther from the entrance of the aforementioned clarification tank.

Description

Discharge structure of heterogeneous base material of molten glass, manufacturing device and manufacturing method of glass article Field of invention

The present invention relates to a structure for removing and discharging a heterogeneous base material from a defoamed molten glass, and a manufacturing apparatus and a manufacturing method for a glass article having the structure.

Background of the invention

Hitherto, in order to improve the quality of glass articles, a decompression defoaming device is known as a clarification device that actively removes bubbles generated in the molten glass before the molten glass melted in the melting tank is formed by the forming device. An example.

This reduced-pressure defoaming device is a device that allows the molten glass to pass through the inside of the reduced-pressure defoaming tank at a predetermined reduced pressure degree, so that the bubbles contained in the molten glass grow within a short period of time. Thereby, the grown bubbles float on the surface of the molten glass and break, thereby effectively removing the bubbles from the molten glass.

The decompression defoaming device is provided with a decompression defoaming tank, an introduction pipe and a discharge pipe of molten glass, and a decompression defoaming tank, an introduction pipe, and an exit pipe serving as a molten glass flow path must have excellent heat resistance, Glass has excellent Different corrosion resistance. In order to satisfy these conditions, the decompression defoaming tank, the inlet pipe, and the outlet pipe have so far been composed of platinum alloys such as platinum or platinum-rhodium alloy, or bricks such as electroformed bricks or heat-resistant bricks.

A known example of a decompression defoaming device, a decompression defoaming device is known, which employs any of the following structures: the decompression defoaming tank, the inlet pipe and the outlet pipe are all formed of electrocast brick-like bricks And a structure made of a platinum alloy (see Patent Document 1).

In addition to the decompressing defoaming device, the device for removing bubbles from the molten glass includes a device having a horizontal tubular flow path for feeding the molten glass discharged from the melting tank to the forming device, The bubbles generated by the molten glass on the bottom side of the tubular flow path avoid the molten glass flow and guide them to the top surface side or the liquid surface side of the tubular flow path. At this time, a baffle is provided in the tubular flow path to trap and remove bubbles moving along the baffle, and such a device has been disclosed (see Patent Document 2).

In addition to the decompressing defoaming device, a device for removing bubbles from molten glass is known as a molten glass transfer device. In the molten glass transfer system, a stirrer is provided in a duct for receiving molten glass from a melting tank. It also includes a clarifier that receives molten glass from a duct having the agitator, and a vent hole for degassing is provided in the middle of the clarifier (see Patent Document 3).

In addition to the decompressive defoaming device, a device for removing bubbles from molten glass is known as a device in which a horizontal pipe for receiving molten glass from a melting tank has a double-tube structure in a molten glass transfer system. A vent pipe for exhaust is provided on the top of the double tube outer tube, and a discharge port of molten glass is provided on the bottom of the outer tube (see Patent Document 4).

In addition to the decompressed defoaming device, a device having a structure that separates the surface layer from the molten glass of the bottom layer from the molten glass is known (see Patent Document 5).

Prior art literature Patent literature

Patent Document 1: International Publication No. 08/026606

Patent Document 2: Japanese Patent Laid-Open Publication No. 2007-161566

Patent Document 3: Japanese Patent Publication Gazette No. 2010-535694

Patent Document 4: Japanese Patent Laid-Open Publication No. 2003-95663

Patent Document 5: Japanese Patent Laid-Open Publication No. 62-297221

Summary of invention

In the conventional technique for removing bubbles from a molten glass, a device is provided with a baffle to capture and remove bubbles moving along the baffle (Patent Document 2), or a device equipped with a stirring device and a deaerator The device of the vent hole (Patent Document 3) or the exhaust vent pipe (Patent Document 4) is a device that can efficiently release bubbles generated in the molten glass from the liquid surface of the molten glass to the space. Therefore, in terms of actively removing bubbles in the molten glass, the performance of the decompressive defoaming device is excellent.

However, it is known that when the defoaming of a molten glass is performed using a decompressed defoaming device, and a glass plate is manufactured by a molding device using the molten glass after the defoaming, for example, 0.05 to 0.05 may be generated on the surface of a glass article. Fine unevenness around 0.2 μm. One of the main uses of this glass article is as Liquid crystal display devices are used for display devices such as glass plates, and glass plates used for display devices are required to have strict surface roughness. When there are slight irregularities on the surface of a glass plate used as a display device, there is a possibility that the optical characteristics such as the refractive index may be affected, and as a result, display unevenness may occur. Therefore, a glass plate having fine unevenness on its surface must be separately processed by other processes such as polishing its surface to make it smooth, which has a disadvantageous aspect in terms of manufacturing cost.

Regarding the cause of fine unevenness on the surface of the glass plate when the decompressed defoaming of the molten glass is performed using the decompressed defoaming device, it is known by the inventors that it is a heterogeneous matrix material generated inside the molten glass The impact.

In the decompression defoaming tank, when decompression defoaming is performed, there is space on the liquid surface of the molten glass. Therefore, when bubbles float on the liquid surface of the molten glass and break and defoam, the light in the molten glass is light. Quantitative components or volatile components may collect on the liquid surface side, and some may move to the space side. Therefore, heterogeneity of components occurs in the liquid surface portion of the molten glass in the defoaming under reduced pressure, and the generation of a heterogeneous matrix material in the molten glass is considered to be one of the causes of fine unevenness on the surface of the glass plate.

In addition, when the pressure reduction tank, riser, and downcomer of a decompression and defoaming device are formed by an electroformed brick or a heat-resistant brick, even if a brick having low reactivity to molten glass is used, the molten glass may contact the brick in some cases. It is also possible that a heterogeneous base material is formed in this part, and this heterogeneous base material is also considered to be a cause of fine unevenness on the surface of the glass plate. This problem may arise regardless of the type of clarification device other than the decompression defoaming device.

In addition, an apparatus having a structure for separating the molten glass of the surface layer and the bottom layer from the molten glass (Patent Document 5) only discloses a separated structure. However, when separating the heterogeneous base material, how to discharge the heterogeneous base material without change, regardless of the type of the clarification device, in the sense of preventing the fine unevenness of the glass plate surface caused by the heterogeneous base material from changing, is very important. important. Therefore, not only is it necessary to discharge the heterogeneous base material, but also how to discharge the heterogeneous base material stably is also an important subject.

The present invention is an invention made based on the above research results, and can efficiently and stably remove the heterogeneous matrix material contained in the molten glass after defoaming, and aims to provide a glass plate that can produce fine unevenness on the surface. technology.

(1) The present invention relates to a heterogeneous base material discharge structure of molten glass. The first structure is formed on a duct for transferring molten glass to a forming mechanism, and a first part for discharging a part of the molten glass flowing in the duct is formed. 1 discharge port, and the molten glass is discharged from the outlet portion of the clarification tank having an inlet portion and an outlet portion of the molten glass, and the heterogeneous base material discharge structure of the molten glass is characterized in that the duct is provided at the outlet The horizontal state duct, the inclined state duct, or the vertical duct extending between the part and the forming mechanism, and the first discharge port has a discharge pipe connected to the first discharge port and moving the molten glass downward, And the first discharge port is in the horizontal state or the inclination The ducts in the state are formed at the top of the cross section of each duct, while the ducts extending in the up-down direction are formed on the side farther from the entrance of the clarification tank with respect to the cross section of the ducts.

(2) In one aspect of the present invention, it is more preferable that the discharge pipe has a heating mechanism.

(3) One aspect of the present invention is the heterogeneous base material discharge structure of the molten glass as described in (1) or (2) above, wherein the duct is connected to the exit portion formed on the bottom surface of the clarification tank. The length of the one discharge port in the circumferential direction of the duct is in a range of 5% or more and 12% or less with respect to the outer circumference of the duct.

(4) One aspect of the present invention is the heterogeneous base material discharge structure of the molten glass as described in (1) or (2) above, wherein the aforementioned duct is connected to a side surface near the bottom surface of the aforementioned clarification tank, and the aforementioned first row The length of the outlet in the circumferential direction of the duct is in a range of 15% to 25% with respect to the outer circumference of the duct.

(5) One aspect of the present invention relates to the heterogeneous base material discharge structure of molten glass according to any one of (1) to (4) above, wherein a partition member is provided in the duct, and the partition member is Except for the area in which the first discharge port is formed, the inner peripheral surface of the catheter is formed at a predetermined interval and is relatively opposed to each other along the inner peripheral surface of the catheter, and has a predetermined depth in the axial direction of the catheter. C-shaped inner wall of the cross section, and a flange type which closes the gap between the end edge portion and the inner peripheral surface of the surrounding duct at the end edge portion on the downstream side of the duct of the inner wall. Weir stop wall, A second discharge port is formed at a position of the catheter facing the inner wall.

(6) One aspect of the present invention is the heterogeneous base material discharge structure of the molten glass according to the above (5), wherein a closed end wall is formed near the first discharge port, and the closed end wall can be closed by the aforementioned Of the region surrounded by the inner peripheral surface of the duct, the outer peripheral surface of the inner wall, and the weir stop wall, the end on the first discharge port side of the enclosed region is closed.

(7) One aspect of the present invention is the heterogeneous base material discharge structure of the molten glass as described in (5) or (6) above, wherein in the cross section of the duct, the opening formed on the first discharge outlet side The opening angle of the part is 20 degrees or more and 60 degrees or less.

(8) One aspect of the present invention is the heterogeneous base material discharge structure of the molten glass according to any one of (5) to (7) above, wherein the cross section of the duct including the first discharge port is A second discharge port is formed in the pipe wall facing the first discharge port formation side.

(9) One aspect of the present invention is the heterogeneous base material discharge structure of the molten glass according to any one of the above (5) to (8), wherein the discharge amount of the molten glass discharged from the aforementioned first discharge port, The amount of molten glass flowing through the duct is 2 wt% or more and 10 wt% or less, and the amount of molten glass discharged from the second discharge port is 6 wt% or less of the entire amount of molten glass flowing through the duct.

(10) One aspect of the present invention relates to a heterogeneous matrix material discharge structure for molten glass according to any one of (5) to (9) above, wherein the weir The relative ratio b / a between the value of the width a of the end wall along the cross section of the duct on the first outlet side and the value of the width b on the opposite side along the cross section of the duct is 1 to 1.5. The width of the weir stop wall is gradually increased from the end portion on the first outlet side toward the other end portion.

(11) One aspect of the present invention is the heterogeneous base material discharge structure of the molten glass according to any one of the above (1) to (10), which includes the aforementioned clarification tank and is connected to the upstream side of the clarification tank The introduction tube of the molten glass and the outlet tube of the molten glass connected to the downstream side of the clarification tank are connected to the aforementioned conduit.

(12) One aspect of the present invention is the heterogeneous base material discharge structure of the molten glass according to any one of (1) to (11) above, wherein the clarification tank is set higher than the conduit position.

(13) One aspect of the present invention is the heterogeneous base material discharge structure of the molten glass according to any one of (1) to (12) above, wherein the duct is located on the downstream side than the first discharge port Position, equipped with a stirring device.

(14) An aspect of the present invention relates to a manufacturing apparatus for a glass article, which is a melting tank for melting glass raw materials to become molten glass, a clarification tank for defoaming molten glass supplied from the melting tank, and The duct for transferring molten glass from the clarification tank to the forming mechanism is provided in the glass article manufacturing device constituted by the defoaming molten glass forming a glass article forming mechanism, as described in (1) to (13) above. The heterogeneous matrix material discharge structure of any one of the molten glass.

(15) One aspect of the present invention relates to a method for manufacturing a glass article. The method is a glass article composed of a melting step of melting glass raw materials to become molten glass, a clarification step of defoaming the molten glass, and a forming step of forming molten glass after the clarification step and processing into a glass article. In the manufacturing method, while transferring the molten glass from the aforementioned clarification step to the forming step, the heterogeneous matrix material of the molten glass is discharged from the structure as described in any one of (1) to (13) above, and the heterogeneous matrix material of the molten glass discharge.

According to the present invention, the molten glass discharged from the clarification tank to the forming mechanism and flowing through the duct after defoaming can efficiently and stably remove the heterogeneous base material, and the heterogeneous base material can be discharged from the duct before being sent to the forming mechanism. To the outside. Therefore, since the molten glass with less bubbles after defoaming and the high-quality molten glass from which the heterogeneous base material is removed without waste can be sent to the forming mechanism, the fine unevenness of the surface can be provided at a high yield. Glass articles with excellent surface smoothness that are small and have little variation.

1‧‧‧ melting tank

2‧‧‧ Decompression housing

2b, 2c‧‧‧plug

2A‧‧‧outer wall

2H‧‧‧ exhaust port

3‧‧‧ decompression tank (clarification tank)

3a‧‧‧ Entrance

3b‧‧‧Export Department

3A‧‧‧ bottom wall

3B‧‧‧ sidewall

3C‧‧‧upper wall

5‧‧‧ rising pipe (introduction pipe)

6‧‧‧ descending pipe (outlet pipe)

7‧‧‧Insulation

8, 9‧‧‧ extension tube (outer tube)

8a‧‧‧Outer tube 8 lower end (downstream end)

9a‧‧‧Outer end of the outer tube 9 (downstream end)

11‧‧‧ upstream side duct

12‧‧‧ upstream trough

15‧‧‧ downstream trough

20‧‧‧ Receiver catheter

21‧‧‧ Connect the catheter

22‧‧‧ relay catheter

23‧‧‧ extension catheter

24‧‧‧ Mixing device

25‧‧‧ Row 1 exit

26,54,57‧‧‧Capture members

27‧‧‧The first discharge pipe

27a‧‧‧ lower end

29‧‧‧ first row exit

30‧‧‧First discharge pipe

31‧‧‧melting tank

33‧‧‧clarification tank

34‧‧‧ Connect the catheter

35‧‧‧ first row exit

36‧‧‧Defoaming device

40, 43, 46, 48, 50, 53, 65‧‧‧ first discharge pipe

40a, 40b‧‧‧Connecting holes

41, 45, 47, 49, 53, 66‧‧‧ discharge branch

44‧‧‧ stranded cabin

52a‧‧‧ the upper end of the first discharge pipe 52

56‧‧‧Guide wall

56a‧‧‧Guide the flow path

57a‧‧‧cylinder wall

57b‧‧‧face wall

57c‧‧‧Access

58, 60‧‧‧ Adjacent members

58a, 60c‧‧‧ closed wall

59‧‧‧ Area above the next member 58

60a‧‧‧bottom wall

60b‧‧‧ sidewall

61‧‧‧ Area above next door member 60

62‧‧‧Adjustment

65a‧‧‧Connecting hole

67‧‧‧ extension tube

70‧‧‧Second Row Exit

71‧‧‧ divider

72‧‧‧ inner wall

72a‧‧‧Edge

72b‧‧‧The peripheral end of the inner wall 72

73‧‧‧ weir stop

73A‧‧‧Opening

73b‧‧‧ perimeter end of weir stop wall 73

74‧‧‧ closed end wall

75‧‧‧Import area

76‧‧‧Second discharge pipe

78‧‧‧ Third row exit

79‧‧‧ third discharge pipe

80‧‧‧ weir stop

80a‧‧‧ week end

80b‧‧‧ Central

a, b‧‧‧ width

90‧‧‧ electrode (heating mechanism)

91‧‧‧electrode (heating mechanism)

100‧‧‧Decompression defoaming device

200‧‧‧forming device (forming mechanism)

A‧‧‧The length of the first outlet 25

a ₁ , a ₂ , a ₃ , a ₄ , a ₅ , a ₆ , a ₇ , a ₈ , a ₉ ‧‧‧ arrows

B‧‧‧ Depth of exit 25 in the first row

G, G ₁ , G ₂ ‧‧‧ molten glass

G6‧‧‧Glassware

H ₁ , H ₂ , H ₃ ‧‧‧ boundary

K1 ~ K5‧‧‧‧steps

FIG. 1 is a configuration diagram showing an example of a decompressing defoaming device using a heterogeneous base material discharge structure according to a first embodiment of the present invention.

2 (A) is a cross-sectional view showing a main part of a heterogeneous base material discharge structure provided in a duct of the same decompressive defoaming device, and FIG. 2 (B) is a plan view of a first discharge port provided in the same structure.

3 is a side cross-sectional view showing a main part of a heterogeneous base material discharge structure used in the same decompressing defoaming device.

Figure 4 is a diagram showing a catheter An explanatory diagram of an example of a range in which the molten glass is discharged by the provided heterogeneous base material discharge structure.

FIG. 5 is a schematic diagram showing an example of a planar shape of a pressure reducing tank provided in the same pressure reducing and defoaming device.

Fig. 6 is a schematic cross-sectional view showing a defoaming device according to a second embodiment of the present invention.

Fig. 7 is a configuration diagram showing a second example of a discharge mechanism provided in the defoaming device of the present invention.

8 is a configuration diagram showing a third example of a discharge mechanism provided in the defoaming device of the present invention.

Fig. 9 is a configuration diagram showing a fourth example of a discharge mechanism provided in the defoaming device of the present invention.

Fig. 10 is a configuration diagram showing a fifth example of a discharge mechanism provided in the defoaming device of the present invention.

Fig. 11 is a configuration diagram showing a sixth example of a discharge mechanism provided in the defoaming device of the present invention.

FIG. 12 shows a seventh example of a discharge mechanism provided in the defoaming device of the present invention, FIG. 12 (A) is a cross-sectional view, and FIG. 12 (B) is a perspective view with a part as a cross section.

13 is a block diagram showing an eighth example of a discharge mechanism provided in the defoaming device of the present invention.

14 is a configuration diagram showing a ninth example of a discharge mechanism provided in the defoaming device of the present invention.

Fig. 15 is a diagram showing a first embodiment of a discharge mechanism provided in the defoaming device of the present invention; Structure of 10 cases.

16 is a block diagram showing an eleventh example of a discharge mechanism provided in the defoaming device of the present invention.

FIG. 17 is a configuration diagram showing a twelfth example of a discharge mechanism provided in the defoaming device of the present invention.

18 is a configuration diagram showing a thirteenth example of a discharge mechanism provided in the defoaming device of the present invention.

FIG. 19 is a perspective view showing a positional relationship between a first discharge port, a second discharge port, and a partition member provided in the defoaming device of the present invention. FIG. 19 (A) is a perspective view, and FIG. 19 (B) is a perspective view of the partition member.

FIG. 20 is a front view showing a positional relationship of a duct, a first discharge port, a second discharge port, and a partition member provided in the defoaming device.

21 is a cross-sectional view showing a positional relationship of a duct, a first discharge port, a second discharge port, and a partition member provided in the same defoaming device.

22 is a front view showing a positional relationship of a duct, a first discharge port, a second discharge port, a third discharge port, and a partition member provided in the same defoaming device.

It is a block diagram which shows the other example of the partition member provided in the same defoaming apparatus.

FIG. 24 is a flowchart illustrating the manufacturing steps of the glass article in the order of steps.

FIG. 25 shows the results of the correlation between the length and depth of the first discharge port and the discharge area of the molten glass in the same defoaming device, and FIG. 25 (A) shows the results when the depth is 15 mm. FIG. 25 (B) is a diagram showing an analysis result at a depth of 30 mm.

FIG. 26 shows the correlation between the opening angle of the partition member and the area where the first and second discharge ports discharge molten glass in the defoaming device according to an embodiment of the present invention. FIG. 26 (a) shows the opening FIG. 26 (b) is a diagram showing the results at an opening angle of 20 degrees, FIG. 26 (b) is a diagram showing the results at an opening angle of 30 degrees, and FIG. 26 (d) is a diagram showing FIG. 26 (e) is a diagram showing the results at an opening angle of 60 degrees, and FIG. 26 (e) is a diagram showing the results at an opening angle of 90 degrees, and FIG. 26 (g) is FIG. 26 (h) is a diagram showing the results when the opening angle is 140 degrees, and FIG. 26 (h) is a diagram showing the results when the downcomer is a double pipe.

Forms used to implement the invention

"First Embodiment"

Hereinafter, one embodiment of the clarifying device of the present invention will be described with reference to the drawings, but the present invention is not limited to the embodiments described below.

FIG. 1 is a schematic view showing a cross-sectional structure of a decompressive defoaming device provided as a clarifying device according to a first embodiment of the present invention, a melting tank provided on the front side of the decompressive defoaming device, and a decompression device provided as a forming mechanism. Drawing of the forming device on the back side of the defoaming device.

The reduced-pressure defoaming device 100 shown in FIG. 1 is an example of a clarification device provided for decompressing and defoaming the molten glass G supplied from the melting tank 1 and is suitable for a molding device that can be continuously supplied to subsequent steps. (Forming mechanism) A device for manufacturing steps of 200 glass articles.

The reduced-pressure defoaming device 100 according to the present embodiment includes a reduced-pressure casing 2 made of a metal, for example, an outer wall 2A made of stainless steel. The interior remains decompressed. A pressure reduction tank 3 is horizontally arranged inside the pressure reduction casing 2.

The decompression casing 2 is provided to ensure the airtightness of the decompression tank 3, and is formed in a slightly door shape in the embodiment shown in FIG. 1. The pressure-reducing casing 2 is only required to have the airtightness and strength required for the pressure-reducing tank 3, and the material and structure thereof are not particularly limited. However, the pressure-reducing casing 2 is preferably formed of an outer wall 2A made of a heat-resistant metal, particularly stainless steel .

The decompression casing 2 is configured to pass through the exhaust port 2H on the upper side, and to perform vacuum suction by a vacuum pump (not shown) or the like from the outside, so that the decompression tank 3 can be maintained at a predetermined decompression state. , Decompression state around 1/20 ~ 1/3 atmosphere.

The pressure-reducing tank 3 accommodated in the pressure-reducing casing 2 is composed of a bottom wall 3A, a side wall 3B, and an upper wall 3C. An inlet portion 3a is formed on the lower surface of one end side of the bottom wall 3A, and the other of the bottom wall 3A An outlet portion 3b is formed on the lower side of one end side. An upper end portion of a riser (also referred to as an introduction pipe) 5 is connected to the inlet portion 3a, and an upper end of a downcomer (also referred to as a discharge pipe) 6 is connected to the outlet portion 3b. unit.

The ascending pipe 5 and the descending pipe 6 are arranged so as to be able to communicate with the outside through the insertion port 2b or the insertion port 2c formed on the outer wall 2A of the bottom side of the decompression housing 2. Further, an extension pipe 8 extending downward through the insertion opening 2b of the outer wall 2A is connected to the lower end portion of the rising pipe 5, and a downward opening through the insertion hole 2c of the outer wall 2A is connected to the lower end portion of the down pipe 6. Extension tube 9 extending below.

In addition, on the inner side of the decompression casing 2, heat insulation such as heat insulation bricks is arranged around the decompression tank 3, around the riser pipe 5, and around the downcomer pipe 6, respectively. The material 7 has a structure in which the outer sides of the pressure reduction tank 3, the ascending pipe 5, and the downcomer 6 are surrounded by the heat insulating material 7.

In the reduced-pressure defoaming device 100 according to this embodiment, the pressure-reducing tank 3, the rising pipe 5, and the falling pipe 6 are briefly described in FIG. . It is the case that a large-scale device is used to constitute such a structure with bricks. However, in the case of a relatively small-scale device, the decompression tank 3 and the riser 5 may be formed of platinum or a platinum alloy such as reinforced platinum. And one or all of the downcomers 6.

In the decompression and defoaming device 100, when the decompression tank 3 is a hollow tube made of brick, the decompression tank 3 is a hollow tube made of brick with a rectangular cross-section and has an internal shape of a molten glass flow path. Has a rectangular cross section. When the decompression tank 3 is a hollow tube made of platinum or a platinum alloy, the internal cross-sectional shape of the molten glass flow path in the decompression tank 3 should preferably have a circular or oval shape.

When the ascending pipe 5 and the descending pipe 6 are brick hollow pipes, the ascending pipe 5 and the descending pipe 6 are brick hollow pipes having a circular cross section or a rectangular polygonal cross section, and become a molten glass flow path. The internal cross-sectional shape should preferably have a circular cross-section.

When the ascending pipe 5 and the descending pipe 6 are hollow pipes made of platinum or platinum alloy, the internal cross-sectional shape of the molten glass flow path in the ascending pipe 5 or the descending pipe 6 should have a circular or oval shape.

A specific example of the dimensions of the ascending pipe 5 and the descending pipe 6 is a length of 0.2 to 6 m and a width in the internal cross-sectional shape of 0.05 to 1.0 m.

In the structure of this embodiment, an extension tube 8 is attached to the lower end portion of the ascending tube 5, and an extension tube is attached to the lower end portion of the descending tube 6. The outer tube 9 is made of platinum or a platinum alloy.

In addition, when the ascending tube 5 and the descending tube 6 are hollow tubes made of platinum or platinum alloy, the outer tubes 8 and 9 for extension may not be provided separately, but the ascending tube 5 and the descending tube 6 may be integrally extended to The structure of the part shown as an outer pipe 8 and 9 in FIG. With such a structure, the description of the outer tubes 8 and 9 in the following description of the present specification can be replaced and applied to the description of a riser and a drop made of platinum or a platinum alloy.

The rising pipe 5 communicates with the inlet portion 3 a of the decompression tank 3, and introduces the molten glass G from the melting tank 1 into the decompression tank 3. Therefore, the lower end (downstream end) 8a of the outer pipe 8 attached to the rising pipe 5 is inserted from the open end of the upstream pit 12 connected to the melting tank 1 through the upstream duct 11 and is immersed in the upstream groove. 12 within the molten glass G.

In addition, the downcomer 6 communicates with the outlet portion 3b of the decompression tank 3, and transfers the decompressed and defoamed molten glass G to the forming apparatus 200 side in the next step. Therefore, the lower end (downstream end) 9a of the outer tube 9 attached to the downcomer 6 is a molten glass G which is fitted in the open end of the downstream tank 15 and is immersed in the downstream tank 15.

In the downstream tank 15 connected to the decompressive defoaming device 100 of the present embodiment, a portion into which the outer tube 9 is inserted is formed by a vertical-tube-type receiving-part duct 20 that is arranged substantially vertically in the vertical direction. A connection duct 21 extending horizontally toward the forming apparatus 200 toward the direction away from the decompression housing 2 is connected to the bottom side of the receiving duct 20, and a vertical tube-type relay is connected to the other end side of the connection duct 21 The duct 22, the receiving duct 20, the connection duct 21, and the relay duct 22 are arranged in a U shape as viewed from the side as shown in FIG.

The relay duct 22 is connected to the side away from the decompression casing 2. There is an extension duct 23 which extends horizontally toward the forming apparatus 200 side. Inside the relay duct 22, a stirring device 24 for stirring the molten glass G is provided.

The material constituting the downstream groove 15 is formed of platinum or a platinum alloy such as reinforced platinum that constitutes the outer tube 9.

In the structure of this embodiment, the connection duct 21 is horizontally arranged, and a first discharge port 25 having a specific shape as shown in FIG. 2 and FIG. 3 is formed on the top of the halfway part. In this embodiment, as shown in FIG. 2 (B), the first discharge port 25 is formed into an elongated rectangular shape as viewed in a plan view along the circumferential direction of the connection duct 21.

The L-shaped first discharge pipe 27 is connected to a top portion of the connection duct 21 through a peripheral portion of the opening outside the first discharge port 25 through a collection member 26. The collecting member 26 is formed in a funnel shape, and is attached to the outside of the connection duct 21 so as to cover a peripheral portion of the opening on the outer side of the first discharge port 25. The molten glass G discharged from the first discharge port 25 passes through the capture member 26, is guided to the first discharge pipe 27, and is discharged from the lower end portion of the first discharge pipe 27 to the outside of the connection pipe 21. The purpose of the discharge here is not to discharge the gas or bubbles volatilized from the molten glass G, but to discharge the molten glass itself. The first discharge pipe 27 may be directed downward. The molten glass should preferably be filled in the tube of the first discharge tube 27, and the siphon effect caused by the molten glass facing downward can be found. Thereby, a certain amount of molten glass can be stably discharged from the discharge port 25 with a small pressure fluctuation of the molten glass.

Inside the connecting duct 21, the molten glass G flowing near the first discharge port 25 is automatically removed from the first row in response to its own flow pressure. The outlet 25 is discharged to the outside and side-by-side to the first discharge pipe 27. By the above-mentioned siphon effect, a certain amount can be discharged stably from the lower end of the first discharge pipe 27 with a small pressure fluctuation of the molten glass.

Here, as shown in FIG. 2 (A), the electrodes 90 and 91 arranged on the outer periphery of the first discharge tube 27 allow electric current to flow through the molten glass G between the tubes, thereby heating the current, thereby adjusting the first The temperature of the molten glass G in the discharge pipe 27 can make the pressure or quantity of the molten glass G discharged more stable. As a heating mechanism for the molten glass G in the tube, other methods of directly heating the heater in the molten glass, a method of heating the first discharge tube 27 itself, and the like may be appropriately selected.

The first discharge port 25 is formed in a rectangular shape drawn along the length A of the connection duct 21 in the circumferential direction as shown in FIG. 2 (B) (that is, when the connection duct 21 is viewed horizontally from a planar perspective). The length A) of the long side and the depth B of the plane along the tube axis direction of the connecting duct 21 are rectangular.

The length A of the first discharge port 25 is preferably 5% or more and 12% or less with respect to the outer circumference of the connecting duct 21. The depth B of the first discharge port 25 may be, for example, a size of 10 to 30 mm when the pipe diameter of the connection duct 21 is 100 to 400 mm. In addition, the depth B of the first discharge port 25 is such that when the average flow velocity of the molten glass G flowing inside the connection duct 21 is v (mm / s), a relationship of v × (6 to 40) (mm) should be satisfied.

When the opening area of the first discharge port 25 is too small, the resistance when the molten glass G passes through the first discharge port 25 becomes large, and the molten glass G cannot be easily discharged from the first discharge port 25, and the required discharge amount cannot be secured. And when the first row of exit 25 opens When the area of the opening is too large, the force for pulling the molten glass G to the side of the first discharge opening 25 becomes weak, so it is difficult to secure a required discharge range.

FIG. 4 is a diagram illustrating a region where the molten glass G flowing near the top of the connection duct 21 can be discharged when the length A of the first discharge port 25 is changed. The relationship shown in FIG. 4 is a summary of results derived from simulation results described later.

When the diameter (inner diameter) of the connecting conduit 21 is set to 250mm, the first outlet B 25 of fixed depth 50mm, the length of the boundary line area A is discharged when 105mm is H _1, the length A is 80mm The boundary line of the area to be discharged is H ₂ , and the boundary line of the area to be discharged when the length A is 55 mm is H ₃ .

When the length A of the first discharge port 25 is 55 mm with respect to the outer diameter of the connection duct 21, the width of the region where the molten glass G near the top can be discharged is narrow in the left-right direction and deep in the up-down direction. In contrast, if the length A of the first discharge port 25 is set to be as large as 80 mm or 105 mm, the width of the region where the molten glass G can be discharged becomes wide in the left-right direction and slightly shallow in the height direction (up-down direction).

From this relationship, it can be seen that if the length A and depth B of the first discharge port 25 formed in the connection duct 21 are set to appropriate values, the molten glass G flowing near the top of the connection duct 21 can be adjusted. The width of the area discharged from the outlet 25 (that is, the width in the radial direction of the connection duct 21) and the depth that can be discharged (that is, the height of the connection duct 21 in the vertical direction).

In the decompressed defoaming device 100 having the structure shown in FIG. 1, when molten glass G is supplied into the decompression tank 3, if bubbles rise to the liquid surface portion of the molten glass G and break, the liquid surface area may be broken. A heterogeneous matrix material is generated, and this heterogeneous matrix material flows into the downcomer 6 in the directions of arrows a ₁ , a ₂ , a ₃ , and a ₄ shown in FIG. 5. Next, the substrate material heterogeneity by arrow a in FIG. 1 as shown in _{FIG. 5} flows into the interior of the downcomer 6, along the arrow _{a 6, a 7, a 8} , shown in Figure 1 along the downcomer 6 The end edge of one side flows downward and flows in the connecting duct 21 along the arrow a ₉ and along the area on the top of the connecting duct 21. The above is the facts learned by the inventors through research.

The present inventors have further mastered through research: For example, a heterogeneous matrix material flows from the top of the inner peripheral surface of the connection pipe 21 having a pipe diameter of 250 mm, and flows in a range of about 15 mm in depth and about 65 mm in width.

Therefore, it can be seen that the first discharge port 25 is very effective for removing a heterogeneous base material.

In addition, from the simulation analysis results described below and the description of the examples, it can be seen that the first discharge port 25 having a length A ranging from 5 to 12% relative to the perimeter of the outside of the connection duct 21 is formed, thereby allowing flow to the connection duct. The heterogeneous base material on the top of 21 is discharged to the outside of the connecting duct 21.

The reduced pressure defoaming device 100 described above is an example in which a first discharge port 25 is formed on the top of the horizontally connected connecting duct 21, but the following configuration may also be adopted: Considering the molten glass G The flow of the heterogeneous base material forms a first discharge port 29 for the receiving duct 20 of the upstream groove 15, and thereby the first discharge port 29 discharges the molten glass G containing the heterogeneous base material.

As shown in FIG. 1, the structure of this example has a first discharge port 29 formed on a side surface of the receiving duct 20 and a surface close to the side of the connection duct 21.

In the receiving duct 20, a peripheral portion of the opening outside the first discharge port 29 is connected to a first discharge pipe 30 through a collection member 26. The first discharge pipe 30 extends downward by connecting the side of the pipe 21. .

The formation position of the first discharge port 29 is a side surface of the receiving duct 20 extending in the up-down direction on the side of the connection duct 21 connected to the receiving duct 20 and extending in the horizontal direction. In other words, the first discharge port 29 is It is formed on the side farther from the inlet portion 3a of the decompression tank 3 in the cross section of the receiver duct 20.

In FIG. 1, two structures, such as a structure in which the first discharge port 25 is provided in the connection duct 21 and a structure in which the first discharge port 29 is provided in the receiver duct 20, are described for common illustration. It is sufficient to select one of the structure in which the first discharge port 25 is provided, or the structure in which the receiver duct 20 is provided with the first discharge port 29. Of course, it is good also as a structure provided with the 1st discharge port 25 and 29, as shown in FIG.

As described above, in the inner side of the decompression tank 3, bubbles are broken and eliminated on the liquid surface of the molten glass G, and as a result, a heterogeneous base material is generated near the liquid surface of the molten glass G. The heterogeneous base material generated on the liquid surface side of the molten glass G flows along the arrows a ₅ , a ₆ , a ₇ , a ₈ , and a ₉ shown in FIG. 1, but extends in the vertical direction. The tube 9 and the receiving duct 20 arranged below it will flow along the side near the side connecting the duct 21, and the above situation has been clarified by the study of the inventor.

Therefore, the first discharge port 29 must be formed on the side surface of the receiver duct 20 on the side close to the connection duct 21 shown in FIG. 1. By providing the first discharge port 29 at this position, the molten glass G containing a heterogeneous base material can be stably passed through the first discharge pipe from the first discharge port 29 as in the case described in the previous example. 30 is discharged to the outside.

Therefore, it is possible to selectively send good quality molten glass G with fewer bubbles and fewer heterogeneous base materials to the forming apparatus 200, and in the forming apparatus 200, a glass having excellent flatness without generating fine unevenness on the surface can be produced article.

The reduced-pressure defoaming device 100 described above has described a state in which the first discharge ports 25 and 29 are formed in the horizontally-connected connecting duct 21 and the vertically-received receiving duct 20. The configuration in which 20 or the connection duct 21 is connected to the decompressive defoaming device 100 may form a first discharge port. When the first discharge port is provided in the obliquely arranged duct, the first discharge port must be provided at the top position in the cross section of the duct.

In the cross section of the inclined duct, the first discharge port 25 as described above is provided at the top position, whereby the molten glass containing the heterogeneous matrix material passing through the area near the top can be discharged.

There is no particular limitation on the composition of the molten glass G applied to the reduced-pressure defoaming device 100 of this embodiment.

Therefore, it may be any of soda-lime glass, alkali-free glass, mixed alkali-based glass, borosilicate glass, or other glasses. Moreover, the use of the manufactured glass article is not limited to a building or a vehicle, and various other uses, such as a flat display, are mentioned.

FIG. 6 shows an example of a manufacturing apparatus for a glass article provided with a clarification device. As a defoaming apparatus according to a second embodiment of the present invention, the manufacturing apparatus of this embodiment has a structure in which a connection flow path is passed through downstream of the melting tank 31 32 is provided with a clarification tank 33 instead of the reduction of the previous first embodiment. The defoaming device 100 is pressed, and the forming device 200 is connected to the downstream side of the clarification tank 33 through a connection duct 34.

A first discharge port 35 having the same shape as the first discharge port 25 of the connection pipe 21 previously provided in the first embodiment is provided on the top of the middle portion of the connection pipe 34 in this embodiment. A collection member 26 and a first discharge pipe 27 are provided outside the first discharge port 35 in the same manner as in the previous embodiment. In the present embodiment, the clarification tank 33 constitutes a defoaming device 36.

The first discharge port 35 formed in the connection duct 34 of the present embodiment may have the same shape as the first discharge port 25 provided in the first embodiment, but a range of values of a suitable length A for discharging the molten glass G different.

The length A of the first discharge port 35 in this embodiment is preferably 15% or more and 25% or less with respect to the outer circumference of the connection duct 34. The depth B of the first discharge port 35 may be about 10 to 30 mm when the inner diameter of the connection duct 34 is about 100 to 400 mm.

In the clarification tank 33 of this embodiment, the molten glass G ₁ produced in the melting tank 31 is transferred, and the molten glass G _{1 is} maintained in the clarification tank 33 at a temperature higher than the clarification start temperature of the clarifier, thereby By using the action of the clarifier contained in the molten glass G ₁ to generate bubbles and grow the bubbles, a defoaming treatment can be performed. In addition, the molten glass G ₂ after the defoaming treatment is sent to the forming apparatus 200 side through the connection pipe 34, and the intended glass article can be formed.

In the device according to this embodiment, the defoamed molten glass G ₂ in the clarification tank 33 can pass the heterogeneous matrix material in the molten glass G ₂ flowing near the top of the connection duct 34 from the first part to the middle of the passage through the connection duct 34. The one discharge port 35 is discharged to the outside through the first discharge pipe 27.

Therefore, the heterogeneous matrix material contained in the defoamed molten glass G ₂ after defoaming in the clarification tank 33 can be removed. Therefore, there is an effect that the molten glass G with few bubbles from which the heterogeneous base material has been removed can be conveyed to the forming apparatus 200, and the plate glass article that does not cause fine unevenness on the surface can be formed in the forming apparatus 200.

FIG. 7 shows a second example of the first discharge pipe connected to the first discharge port 25 of the connection duct 21 formed in the first embodiment. In addition, the discharge pipe of each example described below can be similarly applied to the first discharge port 35 formed in the connection duct 34 of the previous second embodiment, but the following description is only for the first discharge port 25 This is explained when setting.

In the example shown in FIG. 7, the first discharge pipe 40 is constituted by a ring-shaped pipe formed to cover a portion of the first discharge port 25 formed on the top of the connection pipe 21 and around the connection pipe 21. A connection hole 40a is formed on the upper side of the wall of the first discharge pipe 40 and communicates with the first discharge port 25. The first discharge pipe 40 extends downward. A discharge branch pipe 41 is connected downward and integrally to the bottom of the first discharge pipe 40, and the discharge branch pipe 41 communicates with the first discharge pipe 40 through a connection hole 40 b formed in the bottom of the first discharge pipe 40.

In the structure shown in FIG. 7, since the molten glass G containing the heterogeneous base material mainly flows near the top of the connection duct 21, it is discharged from the first discharge port 25 and flows through the connection hole 40 a to the first discharge pipe. The inside of 40 flows along both sides of the connection duct 21 along the first discharge pipe 40 to the discharge branch pipe 41 and is discharged from the lower end of the discharge branch pipe 41.

FIG. 8 shows a third example of the first discharge pipe connected to the first discharge port 25 formed in the connection pipe 21 of the first embodiment.

In the example shown in FIG. 8, the first discharge pipe 43 is connected to the first discharge port 25 formed on the top of the connection pipe 21 at one end, and extends in an L shape from the top of the connection pipe 21 to the side. It is connected to a vertical-cylindrical type detention chamber 44 provided on the upper side of the connection duct 21. A discharge branch pipe 45 is integrally connected to the bottom of the detention chamber 44 so as to face downward.

In the structure shown in FIG. 8, the molten glass G containing the heterogeneous base material is discharged from the first discharge port 25, and is retained in the retention tank 44 through the first discharge pipe 43, and then discharged from the discharge branch pipe 45. At this time, by controlling the pressure in the upper part of the detention chamber 44, a siphon effect can be obtained, and the molten glass can be discharged more stably.

FIG. 9 shows a fourth example of the first discharge pipe connected to the first discharge port 25 formed in the connection duct 21 of the first embodiment.

In the example shown in FIG. 9, the first discharge pipe 46 is connected at one end to a first discharge port 25 formed at the top of the connection pipe 21 and extends straight from the top of the connection pipe 21 upward, and at the first One discharge pipe 46 is integrally formed with an L-shaped discharge branch pipe 47 facing down. At this time, by controlling the pressure in the discharge branch pipe in which the first discharge pipe 46 faces upward, a siphon effect can be obtained and the molten glass can be discharged more stably while being downward.

In the structure shown in FIG. 9, the molten glass G containing the heterogeneous base material flows mainly near the top of the connection duct 21, is discharged from the first discharge port 25, and is discharged from the lower end of the discharge branch pipe 47 through the first discharge pipe 46.

FIG. 10 shows a connection to the first embodiment. The fifth example of the first discharge pipe connected to the first discharge port 25 of the duct 21.

In the example shown in FIG. 10, the first discharge pipe 48 is formed of a pipe body, and the pipe body is connected to the first discharge port 25 formed on the top of the connection pipe 21 at one end thereof so as to surround the connection pipe. 21 covers about half of its circumference and extends downward; and a discharge branch pipe 49 that is integrally formed downward from a portion extending to the bottom side of the connection duct 21 is connected downward.

In the structure shown in FIG. 10, since the molten glass G containing the heterogeneous base material mainly flows near the top of the connection duct 21, it is discharged from the first discharge port 25, flows downward through the first discharge pipe 48, and is discharged from the first discharge pipe 48. The lower end of the branch pipe 49 is discharged.

FIG. 11 shows a sixth example of the first discharge pipe connected to the first discharge port 25 formed in the connection pipe 21 of the first embodiment.

In the example shown in FIG. 11, the first discharge pipe 48 is connected to a portion of the first discharge port 25 formed on the top of the connection pipe 21 at one end thereof, and is formed so as to cover the connection pipe 21 about 1/4 of the circumference thereof. And is directed downward, and below it, a discharge branch pipe 49 extending linearly downward is connected.

In the structure shown in FIG. 11, since the molten glass G containing the heterogeneous base material mainly flows near the top of the connection duct 21, it is discharged from the first discharge port 25, flows downward through the first discharge pipe 48, and is discharged from The lower end of the branch pipe 49 is discharged.

FIG. 12 shows a seventh example of the first discharge pipe connected to the first discharge port 25 formed in the connection pipe 21 of the first embodiment.

In the example shown in FIG. 12, the first discharge pipe 52 is formed so as to partially extend toward the center of the up-and-down penetrating connection duct 21, and a downward-direction connection guide is formed at a lower end portion thereof. A discharge branch pipe 53 protruding below the pipe 21, and an upper end portion 52a of the first discharge pipe 52 has an opening inside the dome-shaped trap member 54 covering the opening of the first discharge port 25.

In the structure shown in FIG. 12, since the molten glass G containing the heterogeneous base material mainly flows near the top of the connection duct 21, it flows into the inside of the dome-shaped trap member 54 from the first discharge port 25 and flows to An upper end portion 52 a of the first discharge pipe 52 is discharged from a discharge branch pipe 53 connected to a lower end side of the first discharge pipe 52.

FIG. 13 shows an eighth example of the first discharge pipe connected to the first discharge port 25 formed in the connection pipe 21 of the first embodiment.

In the example shown in FIG. 13, the L-shaped first discharge pipe 27 has the same structure as that of the previous first embodiment in that one end is connected to the first discharge port 25 through the capture member 26 and faces downward. In the structure of FIG. 13, a guide wall 56 having a U-shaped cross section is formed on the lower side of the first discharge port 25 and the upper part inside the connection duct 21. The length in the direction of the catheter axis of the guide wall 56 is several times as long as the length in the direction of the catheter axis of the opening portion of the first discharge port 25. A guide flow path 56 a is formed between the inner peripheral surface of the connection duct 21 around the first discharge port 25 and the guide wall 56, and the first discharge port 25 is arranged on the top of the guide flow path 56 a.

In the structure shown in FIG. 13, since the molten glass G containing the heterogeneous base material mainly flows near the top of the connection duct 21, it flows into the guide flow path 56 a, flows along the guide flow path 56 a, and then flows from the first The discharge port 25 is discharged, and is discharged to the first discharge pipe 27 through the funnel-shaped collecting member 26, and can be discharged from the lower end of the first discharge pipe 27.

FIG. 14 shows a ninth example of the first discharge pipe connected to the first discharge port 25 formed in the connection pipe 21 of the first embodiment.

In the structure shown in FIG. 14, a collection member 57 having a bottomed cylindrical body in a horizontal shape is attached to the top of the connection duct 21 so as to surround the first discharge port 25. The collecting member 57 is composed of a cylindrical wall 57a and an end surface wall 57b formed at both end portions of the cylindrical wall 57a. The capture member 57 is integrated with the connection duct 21 with its central axis being horizontal, and includes the width and depth of the part where the first discharge port 25 and the area inside it can be estimated to flow through the heterogeneous base material in a circle. The tube wall 57a is integrated with the connection duct 21 inside. That is, the capture member 57 and the connection duct 21 are integrated so that the lower half of the cylindrical wall 57 a shown in FIG. 14 extends right and left into the inside of the connection duct 21.

In the capturing member 57 shown in FIG. 14, the end surface wall 57 b on the upstream side of the connection duct 21 is omitted on the inside side of the connection duct 21, and a molten glass inlet 57 c is formed at this portion, and the molten glass will be taken from this inlet. 57c flows into the inside of the collection member 57.

One end portion of the L-shaped first discharge pipe 27 is connected to the top side of the cylindrical wall 57 a of the collection member 57, and the other end portion of the first discharge pipe 27 faces the lower side of the connection duct 21. Extend below.

In the structure shown in FIG. 14, since the molten glass G containing a heterogeneous base material mainly flows near the top of the connection duct 21, it can be sucked into the trap member 57 from the inlet 57 c and can pass through the first outlet. 25 is discharged from the lower end portion 27a of the first discharge pipe 27.

FIG. 15 shows a tenth example of the first discharge pipe connected to the first discharge port 25 formed in the connection pipe 21 of the first embodiment.

In the structure shown in FIG. 15, a U-shaped partition wall member 58 is formed inside the top of the connection duct 21. The position where the partition wall member 58 is provided is the same as the position of the guide wall 56 of the previous eighth example shown in FIG. 13, and flows near the top of the connection duct 21 and surrounds the molten glass G containing the heterogeneous base material. The location of the area. In the partition wall member 58, a closed wall 58 a is formed at an end edge portion on the downstream side of the connection duct 21. A region 59 defined by the inner peripheral surface of the connection duct 21 and the upper surface of the partition wall member 58 passes through the closed wall 58 a. And blocked on the downstream side. The first discharge port 25 shown in FIG. 15 is connected to the first discharge pipe, but the description is omitted in FIG. 15.

In the structure shown in FIG. 15, since the molten glass G containing a heterogeneous base material mainly flows near the top of the connection duct 21, it can be sucked into a region 59 above the partition member 58, and can pass through this region 59 from the first One discharge port 25 discharges.

FIG. 16 shows an eleventh example of the first discharge pipe connected to the first discharge port 25 of the connection pipe 21 formed in the first embodiment.

In the structure shown in FIG. 16, a concave partition member 60 formed by a bottom wall 60 a and side walls 60 b and 60 b is formed inside the top of the connection duct 21. The position where the partition wall member 60 is provided is the same as the position where the partition wall member 58 is provided in the previous tenth example, and is a position surrounding the area where the molten glass G containing the heterogeneous base material flows near the top of the connection duct 21.

In the partition wall member 60, a closed wall 60c is formed at an end edge portion on the downstream side of the connection duct 21. A region 61 defined by the inner peripheral surface of the connection duct 21 and the upper surface of the partition wall member 60 is formed by the closed wall 60c. The downstream side is closed. A first discharge pipe 27 is connected to the first discharge port 25 shown in FIG. 16, but in the figure The description is omitted in 16.

In the structure shown in FIG. 16, since the molten glass G containing the heterogeneous base material mainly flows near the top of the connection duct 21, it is sucked into the region 61 above the partition member 60 and can be discharged from the first discharge port 25. discharge.

FIG. 17 shows a twelfth example of the first discharge pipe connected to the first discharge port 25 formed in the connection pipe 21 of the first embodiment.

In the structure shown in FIG. 17, the left and right sides of the first discharge port 25 on the top of the connection duct 21 are the inner surface of the connection duct 21, and an adjustment having a predetermined width is formed along the cross section of the connection duct 21. Tablet 62. A first discharge pipe 27 is connected to the first discharge port 25 shown in FIG. 17, but the description is omitted in FIG. 17.

In the structure shown in FIG. 17, since the molten glass G containing the heterogeneous base material mainly flows near the top of the connection duct 21, the molten glass G flowing between the adjustment pieces 62 and 62 can be moved from the first position above it. One discharge port 25 discharges.

Since the adjustment pieces 62 and 62 are formed on both sides of the first discharge port 25, the adjustment pieces 62 and 62 can increase the flow rate of the molten glass G toward the first discharge port 25, and can increase the flow rate from the first The discharge port 25 is a pressure when the molten glass G is discharged.

FIG. 18 shows a thirteenth example of the first discharge pipe connected to the first discharge port 25 formed in the connection pipe 21 of the first embodiment.

In the example shown in FIG. 18, the first discharge pipe 65 is formed of a ring-shaped pipe that is formed to cover the first discharge port 25 formed on the top of the connection duct 21 and surrounds the connection duct. 21 covers its entire week, and in its tube A connection hole 65 a is formed in the upper part of the wall and communicates with the first discharge port 25. A discharge branch pipe 66 is integrally connected downward at the bottom of the first discharge pipe 65, and an extension pipe 67 is integrally formed at the top of the first discharge pipe 65 upward. By adjusting the pressure on the upper surface of the molten glass of the extension pipe 67, a siphon effect can be obtained, and the amount of molten glass discharged from the discharge branch pipe 66 can be stabilized.

In the structure shown in FIG. 18, since the molten glass G containing the heterogeneous base material mainly flows near the top of the connection duct 21, it is discharged from the first discharge port 25 and flows through the connection hole 65 a to the first discharge pipe 65. And flows downward along both sides of the first discharge pipe 65 to the discharge branch pipe 66 and is discharged from the lower end of the discharge branch pipe 66.

19 to 21 show an example in which a second discharge port 70 and a partition member 71 are provided in addition to the first discharge port 25 and the first discharge pipe 27 as a pressure reduction applied to the first embodiment described previously. The defoaming device 100 or the discharge structure of the heterogeneous base material having the defoaming device 36 provided with the clarification tank 33 in the second embodiment.

In this example, the second discharge port 70 is a connection duct 21 provided horizontally, and is provided on the bottom side of the connection duct 21 so as to have a rectangular shape when viewed from a plan view.

The connection duct 21 is provided with a partition member 71 as described below at a portion between the first discharge port 25 and the second discharge port 70.

The partition member 71 has a structure in which the inner wall 72 of the C-shaped cross section is connected to the inner peripheral surface of the connection duct 21 at a predetermined interval except for a region where the first discharge port 25 is formed. The inner peripheral surface of the duct 21 is opposite to each other; the weir stop wall 73 of the flange type is connected to the downstream side of the duct of the inner wall 72 The end edge portion 72a is formed to extend outward at a right angle; and the closed end wall 74 is formed at both ends in the circumferential direction of the inner wall 72 and the weir stop wall 73 at a right angle to these. The partition member 71 is entirely made of a heat-resistant material equivalent to the connection pipe 21, for example, platinum or a platinum alloy such as reinforced platinum.

The inner wall 72 is formed longer than a predetermined length in the axial direction of the connection duct 21, for example, the depth of the second discharge port 70 in the axial direction of the connection duct, and is disposed on the inner peripheral surface of the connection duct 21. It is C-shaped in cross section with a certain interval. The weir stop wall 73 extending outward from the end edge portion 72a of the inner wall 72 has a uniform width and abuts against the inner peripheral surface of the connecting duct 21, and is fixed to the inner peripheral surface of the connecting duct 21 by a joining mechanism such as welding. .

At a portion where the peripheral end portion 72b of the inner wall 72 and the peripheral end portion 73b of the weir stop wall 73 intersect, a rectangular plate-shaped occlusion is connected to the peripheral end portions 72b and 73b at a right angle by a welding mechanism such as welding The end wall 74 is integrated with the aforementioned portion. The outer edge of the closed end wall 74 is brought into contact with the inner peripheral surface of the connection duct 21 and welded to the inner peripheral surface of the connection duct 21. Between the partition member 71 and the connection duct 21, an introduction region 75 surrounded by the weir stop wall 73, the inner wall 72, and the inner peripheral surface of the connection duct 21 is formed. In this introduction region 75, the first discharge port The portion on the 25 side is closed by the occlusion end wall 74.

As shown in FIG. 20, the opening angle (θ) formed by the opening portion 73A on the peripheral end side of the C-shaped weir stop wall 73 and the center of the inner wall 72 is, in other words, provided on the C-shaped weir stop wall 73. The opening angle (θ) formed by the closed end walls 74 and 74 of the peripheral end portion in the cross section of the connection duct 21 and the center of the connection duct 21 is preferably in a range of 20 degrees or more and 60 degrees or less.

As for the value of the opening angle, as long as it is 20 degrees or more and 60 degrees or less Range, that is, the molten glass G flowing in the top region of the connection duct 21 can be discharged from the first discharge port 25 along a preferred width and depth. As for the value of the opening angle, as long as it is in a range of 30 degrees or more and 60 degrees or less, the molten glass G flowing through the top region of the connection duct 21 can be discharged from the first discharge port 25 along a better width and depth, and The molten glass G existing in the inner peripheral region of the connection duct 21 can be discharged in the widest possible range in the circumferential direction of the connection duct 21. In addition, a region where the molten glass G can be discharged from the first discharge port 25 and a region which can be discharged from the second discharge port 70 are collectively provided around the connection duct 21, and there is a region which can be discharged together at one time. effect.

When the value of the opening angle is less than 20 degrees, the molten glass G flowing in the top region of the connection duct 21 cannot be discharged with a desired width, and when the opening angle exceeds 60 degrees, the molten glass can be discharged from the first discharge port 25 The region of the glass G and the region of the molten glass G that can be discharged from the second discharge port 70 are not continuous in the inner circumferential direction of the connection duct 21, and there is a possibility that the content may not be sufficiently discharged in the circumferential direction of the connection duct 21. Region of molten glass G of a heterogeneous base material.

In the connection duct 21, the second discharge port 70 provided on the bottom side of the position where the partition member 71 is provided is formed in a rectangular shape as viewed from a plane as in the first discharge port 25.

The range of the width and depth of the second discharge port 70 is formed in the same range as the width and depth of the first discharge port 25. The second discharge port 70 may have the same size as the first discharge port 25 or may have a different size. However, the discharge amount of the molten glass G that can be discharged through the second discharge port 70 The total amount of molten glass G passing through the connecting pipe 21 is preferably an amount of 6 wt% or less.

This is because when the molten glass G flowing through the connection duct 21 is excessively discharged from the second discharge port 70, the amount of waste of the molten glass G is increased, so that productivity (that is, yield) is reduced. The ratio of the amount of molten glass G discharged from the first discharge port 25 and the amount of molten glass G discharged from the second discharge port 70 can be set freely. About 2wt% of the total amount of G has a high probability of containing a heterogeneous matrix material. Therefore, it is appropriate to discharge more than 2wt%. Since discharge of more than 10wt% has a problem of productivity, it is desirable to discharge less than 10wt%. Of the total amount of molten glass G passing through the connection duct 21 in the first discharge port 25, it is more preferable to discharge 6 wt% or less.

In the aforementioned partitioning member 71, the width of the weir stop wall 73 (that is, the width along the cross-section of the connection duct 21) varies depending on the inner diameter of the connection duct 21 provided, but is preferably 5 mm or more. In addition, it is preferably about 2.5% to 5% of the inner diameter of the connecting duct 21. The width of the weir stop wall 73 is less than 5 mm, and the required amount of molten glass cannot be discharged from the second discharge port 70. If the width is too large, the good quality of the non-containing heterogeneous matrix material discharged from the second discharge port 70 may be improved Molten glass G.

The part that will be discharged from the second discharge port 70 is mainly composed of a heat-resistant brick and the pressure relief tank 3, and the heterogeneous matrix material generated by the contact between the molten glass G and the heat-resistant brick is the main component. When the decompression tank 3 is configured, the heterogeneous base material may not be discharged from the second discharge port 70.

However, even when the decompression tank 3 is made of a platinum alloy, a slight reaction product may be generated due to the reaction between the decompression tank 3 and the molten glass G. Consider In this case, even when the decompression tank 3 is made of a platinum alloy, the molten glass G can be discharged from the second discharge port 70 to remove the heterogeneous matrix material.

If a heterogeneous base material discharge structure including a first discharge port 25, a second discharge port 70, and a partition member 71 is used as shown in FIG. 19, the molten glass G flows through the inside of the connection duct 21 provided horizontally. The molten glass G flowing near the top of the connecting pipe 21 can be discharged from the first discharge port 25 to the outside of the connecting pipe 21, and the molten glass G flowing through the area along the inner peripheral portion of the connecting pipe 21 can be discharged from the first The two discharge ports 70 are discharged to the outside of the connection duct 21.

If the structure shown in FIG. 19 is adopted, the heterogeneous matrix material generated on the liquid surface side of the molten glass G in the inside of the decompression tank 3 shown in FIG. 1 and the inside of the decompression tank 3 can be discharged. Two types of heterogeneous base materials, which are generated in a region where a furnace material such as a brick constituting the decompression tank 3 and the molten glass G are in contact with each other.

The heterogeneous matrix material generated on the liquid surface side of the molten glass G in the interior of the decompression tank 3 flows through the arrows a ₅ , a ₆ , and a shown in FIG. 1 as described in the previous embodiment. ₇ , a ₈ , and a ₉ , the heterogeneous base material generated on the liquid surface side of the molten glass G inside the decompression tank 3 can be discharged through the first discharge port 25.

In the interior of the decompression tank 3, the molten glass G located at a position in contact with the furnace material may generate a heterogeneous matrix material due to factors such as dissolving elements from the furnace material. According to the research of the present inventors, the heterogeneous matrix material has been It is known that the heterogeneous matrix material flows along a specific area on the inner periphery of the downcomer 6 and a specific area on the inner periphery of the extension pipe 9. The connecting duct 21 flows along a specific region of the inner periphery of the connecting duct 21.

Therefore, if the structure shown in FIG. 19 is adopted, the heterogeneous base material flowing through the inner peripheral portion of the connecting duct 21 can be stopped by the weir stop wall 73, and the inner wall 72 can stop the Since the molten glass G remains in the area around the inner wall, the molten glass G staying around the inner wall 72 can be guided from the second discharge port 70 to the second discharge pipe 76 and discharged.

In the partition member 71, the opening angle becomes an index indicating the position of the peripheral end of the weir stop wall 73 and the positions of the closed end walls 74 and 74. When the opening angle is large, it means that: among the inner peripheral surfaces of the connecting duct 21, the range in which weir stop wall 73 and occluded end walls 74, 74 can be weir-stopped is small; when the opening angle is small, then It means that in the region of the cross section of the connecting duct 21, the weir stopping wall 73 and the closed end walls 74, 74 can be weir-stopped in a larger range. The molten glass G existing in the inner peripheral region of the weir stop wall 73 and the connecting duct 21 stopped by the weirs blocked by the closed end walls 74 and 74 is discharged from the second discharge port 70.

When the partition member 71 is provided inside the connection duct 21 and the molten glass G weir on the inner peripheral side of the connection duct 21 is stopped by the weir stop wall 73, the glass of the molten glass G in the inside of the connection duct 21 flows. Since a part flows toward the first discharge port 25 side, the pressure during discharge of the molten glass G flowing from the first discharge port 25 to the first discharge tube 27 side can be increased, and the discharge range of the molten glass can be widened.

FIG. 22 shows another structural example of the heterogeneous base material discharge structure in which the connection member 21 is provided with the partition member 71, and shows a third discharge port 78 in addition to the first discharge port 25 and the second discharge port 70. The construction.

In the connection duct 21 shown in FIG. 22, a first discharge port 25 is provided on the pipe wall above the partition member 71, and a second discharge port 70 is provided on the pipe wall below the partition member 71. A third discharge port 78 is provided on the left and right pipe walls, and an L-shaped third discharge pipe 79 that communicates with the third discharge port 78 is provided on the outside of the third discharge port 78.

In the structure shown in FIG. 22, in addition to the second discharge port 70 provided on the bottom side of the connection pipe 21, the molten glass G can also be discharged from the third discharge ports 78 provided on the left and right sides of the connection pipe 21.

In the structure shown in FIG. 22, since the molten glass G is discharged outside the partition member 71 and is on the inner peripheral edge side of the connection duct 21, the third discharge port 78 may be used instead of the second discharge port 70.

In addition, as long as the formation position of the third discharge port 78 is a position facing the inner wall 72, it is not limited to both sides of the connection duct 21, and may be on the upper side or the bottom side of the connection duct 21. The number of the third discharge ports 78 may be any number.

FIG. 23 shows yet another structural example of the heterogeneous base material discharge structure in which the connection member 21 is provided with the partition member 71. The weir stop wall 80 provided on the partition member 71 is changed in width from its upper side to its lower side. example.

The weir stop wall 80 in this example is formed in a C-shape, but the width b of the central portion 80b located on the upper side of the connecting pipe 21 (that is, on the second discharge port 70 side) is formed more than the upper side of the connecting pipe 21. The width a of the peripheral end portion 80a (that is, on the side of the first discharge port 25) is also large. The weir stop wall 80 is formed such that the width gradually increases from the peripheral end portion 80a to the central portion 80b.

In the weir stop wall 80, the value of the relative ratio b / a of the width a of the peripheral end portion 80a and the width b of the central portion 80b is preferably 1 or more and 1.5 or less.

Of course, in the connection duct 21 having the weir stop wall 80 having the structure shown in FIG. 23, the molten glass G containing the heterogeneous base material can be discharged from the first discharge port 25, and the glass containing the heterogeneous base material can be discharged from the second discharge port 70. The point of the molten glass G is also the same as that of the previous examples.

Next, an embodiment of a method for manufacturing a glass article according to the present invention will be described. Fig. 24 is a flowchart of an embodiment of a method for manufacturing a glass article according to the present invention.

A manufacturing method of a glass article according to an embodiment of the present invention is characterized by using a reduced-pressure defoaming device 100 provided in the aforementioned connection duct 21 with a first discharge port 25 and a first discharge pipe 27. In addition, in one embodiment of the method for manufacturing a glass article of the present invention, a decompression defoaming device 100 provided with a first discharge port 29 and a first discharge pipe 30 or a first discharge port 25, Instead of the first discharge port 25 and the first discharge pipe 27, both of the decompression and defoaming devices 100 are reduced in pressure.

An example of the method for manufacturing a glass article of the present invention is a method for manufacturing a glass article having the following steps: a melting step K1, melting the molten glass by a melting mechanism at a front stage of the aforementioned decompression and defoaming device 100 to produce molten glass ; Defoaming step K2, decompression defoaming of the molten glass by the decompression defoaming device 100; forming step K3, forming the molten glass on the downstream side of the decompression defoaming device 100; slow cooling step K4, In the subsequent steps, the molten glass is slowly cooled; and in the cutting step K5, the slowly cooled glass is cut; and a glass article G6 is obtained.

The method for manufacturing a glass article according to the present invention is within the scope of well-known technologies except that the aforementioned decompressed defoaming device 100 is used. As for the apparatus used in the method for manufacturing a glass article of the present invention, as described above, the melting tank 1 is used in the melting step K1, the decompressed defoaming device 100 is used in the defoaming step K2, and the forming step K3 is used. In the middle, a forming apparatus 200 is used.

In Fig. 24, in addition to the melting step, the forming step, and the slow cooling step, which are constituent elements of the method for manufacturing a glass article of the present invention, a cutting step and other subsequent steps are further used as needed.

"Reviewing the Simulation Analysis of the Glass Substrate Evacuation Area"

For a duct with a circular cross section (inner diameter: 250mm) installed horizontally, a structural model in which a first discharge pipe is vertically connected through a first discharge port at the top is assumed, and a sample glass (Asahi Glass (1350 ° C) Co., Ltd.) trade name: AN100) Viscous fluid in flow, simulation analysis of the flow of molten glass according to the finite element method.

Regarding the first discharge port, it is stipulated that the top of the pipe is rectangular as shown in FIG. 2 (B), and has a length A (55mm, 80mm, 105mm) in the circumferential direction of the pipe, and a depth B (15mm, 30 mm) rectangular shape with a plane viewing angle. It is assumed that the above-mentioned molten glass flows in a pipe at a rate of 0.01 L / hour, and simulation analysis is performed.

The simulation analysis results when the depth B of the first row of outlets is set to 15 mm and the length A is set to 55 mm, 80 mm, and 105 mm are shown in Fig. 25 (A). The simulation analysis results when the depth B of the first row of outlets is set to 30 mm and the length A is set to 55 mm, 80 mm, and 105 mm are shown in Fig. 25 (B). The figure shows the melting in half of the tube cross section near the discharge port The range of the glass discharge range, the scale of the horizontal axis and the vertical axis is the distance from the center of the tube in meters.

As shown in FIGS. 25 (A) and (B), when the length of the first discharge port is sequentially reduced from 105mm to 80mm and 55mm, the following tendency can be seen: the dischargeable area in the vicinity of the top of the pipe The width of the molten glass area becomes narrower, and the depth of the dischargeable area becomes slightly deeper. This tendency is also the same when the width of the first discharge port is 30 mm. A part of the analysis result is shown in Table 1 below.

Based on the simulation analysis results shown in Figures 25 (A) and (B) and the results shown in Table 1, it can be known that by adjusting the length and depth of the first discharge port, the top side of the catheter where the heterogeneous matrix material flows can be estimated. In this region, the width (ie, the length in the circumferential direction of the pipe in the cross section of the pipe) and the height (ie, the depth in the cross section of the pipe) of the molten glass to be discharged can be adjusted.

Set the inner diameter of the pipe used for simulation analysis to 250mm, and the first outlet with a width of 55mm is equivalent to 7%; the first outlet with a width of 80mm is equivalent to 10% with respect to the outer circumference; and the width of 105mm The first outlet is equivalent to 13% of the outer circumference.

"Flatness Estimation for Simulation Analysis"

For the same molten glass flow as described above, the following simulation analysis was performed. The result is used to estimate the flatness. Here, it is assumed that a structure is adopted in which a decompression defoaming tank made of bricks and a gate-type decompression defoaming device provided with a riser and a downcomer are horizontal with respect to a receiver duct connected to the downcomer. The extending connection tube made of platinum alloy is formed with a first discharge port having a shape as shown in FIG. 2 and FIG. 3. In addition, it is assumed that the capture member and the first discharge pipe are connected to the opening of the first discharge port, and the flow pressure of the molten glass (Asahi Glass Co., Ltd .: AN100) flowing through the connection pipe is changed from The first discharge pipe discharges the molten glass.

Based on the amount of molten glass discharged from the top of the duct and its position estimated from the first discharge port, the flatness of the molded glass article is estimated from the amount and position of the heterogeneous matrix material remaining in the molten glass to be formed. This estimation is based on a comparison of the amount and position of the heterogeneous base material in the molten glass transferred to the forming apparatus in an actual manufacturing facility, and the correlation data with the surface roughness of the glass plate article obtained at that time. As for the connection duct, a plurality of types of ducts such as a duct having the same tube diameter and a duct having a different tube diameter are assumed.

The inner diameter and outer perimeter of the connecting ducts for which the flatness is estimated, and the length and size ratio of the first discharge port formed in each connecting duct are summarized in Table 2 below. The depth of the first row outlet was set to 25 mm in all cases.

In Table 2, regarding the evaluation of the flatness of the discharge effect, the mark ○ indicates that the result is an example of a glass plate article estimated to have a surface roughness of 1/2 of the target value, and the mark X indicates that the result is estimated to be An example of a glass plate article having a surface roughness of less than a target value is obtained.

In the connection method with the clarification tank shown in Table 2, the curved type refers to: an L-shaped duct that connects a horizontal connection duct to a vertical receiving duct as a whole, and the first connection duct formed horizontally has a first connection duct. Exhaust conditions. The straight type refers to a case where a horizontal straight connecting conduit provided at the bottom of the side of the clarification tank is used, and a first outlet is formed in the connecting conduit.

From the results of the estimation of the flatness shown in Table 2, it can be seen that the bend formed by the receiver tube in the vertical direction and the connection tube in the horizontal direction for the downcomer. In the curved catheter, when the first row of outlets is formed in the horizontal connection duct, the length of the first row of outlets (W: length A shown in Fig. 2 (B)) / the outer circumference of the connection duct (L) It should be in the range of 5% or more and 12% or less.

From the results of the estimation of the flatness shown in Table 2, it can be seen that when the horizontal straight connecting duct provided at the bottom of the side of the clarification tank has a first outlet, the length of the first outlet (W: FIG. 2 ( The value of the length A) / outer circumference (L) of the connecting duct is preferably in the range of 15% or more and 25% or less.

"Review of glass substrate discharge area with heterogeneous substrate discharge structure with partition members under simulation analysis"

A partition member having a structure as shown in FIG. 19 is provided inside the horizontally-connected connecting duct, and a molten glass discharge structure is provided for the heterogeneous base material discharge structure provided with a first discharge port and a second discharge port above and below the wall of the partition member. State simulation analysis.

It is assumed that the inner diameter of the connecting duct is 200 mm, the length of the inner wall of the partition member along the length of the connecting duct is 100 mm, the outer diameter of the C-shaped inner wall of the partition member is 155 mm, the thickness of the inner wall is 1 mm, and the circumferential direction of the first discharge port is assumed. The length is 70mm, the depth is 30mm, the length of the second discharge port in the circumferential direction is 70mm, the depth is 30mm, and the flow rate of the molten glass is 0.03m / s. The molten glass moving inside the connecting duct can be discharged from the first discharge port. The area shown by and the area that can be discharged from the second outlet are shown in Figure 26.

In addition, the opening angle of the inner wall in the partition member is 0 degrees, 20 degrees, 30 degrees, 40 degrees, 60 degrees, 90 degrees, 140 degrees, or the down pipe is a double pipe (that is, for the down pipe In the case of a double-tube structure in which a cylindrical inner tube is arranged, and a structure in which a first discharge port and a second discharge port are formed), Perform simulation analysis. The analysis results are shown in Figs. 26 (a) to (h).

In the analysis results shown in Figs. 26 (a) to (h), the side of the thicker region that is drawn black and oval-shaped indicates the region that can be discharged from the first discharge port, and the thinner blackened circle The area indicated by indicates the area that can be discharged from the second outlet. Among the objects to be analyzed, the first outlet is the upper part and the second outlet is the lower part.

When the opening angle of the inner wall of the partition member is 0 degrees (true circle), as shown in FIG. 26 (a), the area that can be discharged from the first discharge port and the area that can be discharged from the second discharge port, although It is continuous in the inner periphery of the catheter, but the area that can be discharged from the first discharge port is thinly developed, which cannot be said to be effective. When the opening angle is 20 degrees, as shown in FIG. 26 (b), the area that can be discharged from the first discharge port can be secured to a certain thickness. When the opening angle is 30 degrees, as shown in FIG. 26 (c), the thickness and width of the area that can be discharged from the first discharge port are good, and the area that can be discharged from the first discharge port and the area that can be discharged from the second discharge port are good. The area discharged by the discharge port is continuous in the inner periphery of the catheter, and therefore is a better result. When the opening angles are 40 degrees and 60 degrees, as shown in FIGS. 26 (d) and (e), the same results are obtained as in the case of 30 degrees.

When the opening angle is 90 degrees, 140 degrees, and the down pipe is a double pipe, as shown in Figs. 26 (f) to (h), the area that can be discharged from the first discharge port and the area that can be discharged from the second discharge port Discontinuous in the inner periphery of the catheter.

From the above simulation results, it can be determined that if the opening angle formed by the inner wall in the partition member is less than 20 degrees, the molten glass flowing in the top area of the connecting duct cannot be discharged with the required width, and when the opening If the angle exceeds 60 degrees, the area of molten glass that can be discharged from the first discharge port and The discharge area of the molten glass discharged from the second discharge port may not be continuous in the inner circumferential direction of the connection duct, and there may be an area where the molten glass containing the heterogeneous base material cannot be sufficiently discharged in the circumferential direction of the connection duct.

Industrial availability

The technology of the present invention can be widely applied to a defoaming device used when manufacturing glass for buildings, glass for vehicles, glass for optics, glass for medical use, glass for display devices, and other general glass articles.

In addition, the entire contents of the specification, patent application scope, drawings, and abstract of Japanese Patent Application No. 2014-127647 filed on June 20, 2014 are incorporated herein as disclosure of the present invention.

Claims (15)

A heterogeneous base material discharge structure for molten glass is a first discharge port for discharging a portion of the molten glass flowing in the conduit on a conduit for transferring the molten glass to a forming mechanism, and the aforementioned molten glass The molten glass is discharged from the outlet portion of the clarification tank having an inlet portion and an outlet portion of the molten glass, and the heterogeneous base material discharge structure of the molten glass is characterized in that the duct is provided between the outlet portion and the forming mechanism. In the horizontal state, the inclined state, or the vertical direction, the first discharge port has a discharge pipe connected to the first discharge port and moving the molten glass downward, and the first discharge port is in the aforementioned state. The horizontal or inclined tube is formed at the top of the cross section of each tube, while the vertically extending tube is formed at a distance from the clarification tank with respect to the cross section of the tube. The far side of the entrance. For example, the discharge structure of the heterogeneous base material of the molten glass according to claim 1, wherein the discharge pipe further includes a heating mechanism. For example, if the heterogeneous base material discharge structure of the molten glass according to claim 1 or 2 is provided, the duct is connected to the exit portion formed on the bottom surface of the clarification tank, and the length of the first discharge port along the circumferential direction of the duct is relative. The perimeter outside the catheter is in a range of 5% or more and 12% or less. For example, if the heterogeneous base material discharge structure of the molten glass of claim 1 or 2 is provided, the duct is connected to the side near the bottom surface of the clarification tank, and the length of the first discharge port in the circumferential direction of the duct is relative to the length of the duct. The outer circumference of the catheter is in the range of 15% to 25%. For example, the heterogeneous base material discharge structure of molten glass of claim 1 or 2, wherein a partition member is provided in the duct, and the partition member is partitioned on the inner peripheral surface of the duct except for the area where the first discharge port is formed. It is formed opposite to the inner peripheral surface of the catheter at a predetermined interval, and includes a cross-section C-shaped inner wall having a predetermined depth in the axial direction of the catheter, and a downstream side of the catheter on the inner wall. A flange-shaped weir stop wall that closes the gap between the end edge portion and the inner peripheral surface of the surrounding duct, and a second discharge port is formed at a position of the duct opposite to the inner wall. For example, the heterogeneous base material discharge structure of the molten glass of claim 5, wherein a closed end wall is formed near the first discharge port, and the closed end wall can be covered by the inner peripheral surface of the catheter, the outer peripheral surface of the inner wall, and In the area surrounded by the weir stop wall, an end portion on the first discharge port side of the enclosed area is closed. According to claim 5, the heterogeneous base material discharge structure of molten glass, in the cross section of the duct, an opening angle of an opening portion formed on the first discharge port side is 20 degrees or more and 60 degrees or less. As described in claim 5, the heterogeneous base material discharge structure of the molten glass, in the cross section of the duct including the first discharge port, a second row is formed in a pipe wall facing the first discharge port forming side. Export. For example, the heterogeneous base material discharge structure of the molten glass of claim 5, wherein the discharge amount of the molten glass discharged from the first discharge port is 2 wt% or more and 10 wt% or less of the entire amount of the molten glass flowing through the duct. The discharge amount of the molten glass discharged from the second discharge port is 6 wt% or less of the entire amount of the molten glass flowing through the duct. If the heterogeneous base material discharge structure of the molten glass according to claim 5, wherein the value of the width a of the weir stop wall along the cross section of the duct on the side of the first discharge port side is equal to the width a The relative ratio b / a of the value of the width b on the opposite side is in the range of 1 to 1.5, and the width of the weir stop wall is gradually increased from the end portion on the first discharge port side toward the other end portion. If the heterogeneous base material discharge structure of the molten glass of claim 1 or 2 includes the aforementioned clarification tank, an introduction pipe for the molten glass connected to the upstream side of the clarification tank, and a molten glass connected to the downstream side of the clarification tank. The lead-out tube is connected to the lead-out tube. For example, the heterogeneous base material discharge structure of the molten glass according to claim 1 or 2, wherein the clarification tank is provided at a position higher than the conduit. If the heterogeneous base material discharge structure of the molten glass according to claim 1 or 2 is provided, a stirring device is provided at a position on the downstream side of the duct than the first discharge port. A glass article manufacturing device includes a melting tank that melts glass raw materials to become molten glass, a clarification tank that defoams molten glass supplied from the melting tank, and forms the defoamed molten glass to form a glass article. The manufacturing apparatus for a glass article constituted by a molding mechanism includes a heterogeneous base material discharge structure for molten glass as described in any one of claims 1 to 13 in a duct for transferring molten glass from the clarification tank to the molding mechanism. A method for manufacturing a glass article is a melting step of melting glass raw materials to become molten glass, a clarification step of defoaming the molten glass, and a molding step of forming the molten glass after the clarification step into a glass article. In the method for manufacturing a glass article having a structure, in the process of transferring the molten glass from the aforementioned clarification step to the forming step, the heterogeneous base material of the molten glass according to any one of claims 1 to 13 is used to discharge the structure, thereby removing the heterogeneity of the molten glass. The base material is discharged.