JP2021151934A - Apparatus and method for producing glass fiber - Google Patents

Abstract

To make it possible to rapidly change conditions for producing a glass fiber.SOLUTION: An apparatus 1 for producing a glass fiber includes: a feeder 3 which circulates a molten glass 2; a bushing 4 in which a nozzle hole 6 is provided and which is arranged below the feeder 3; and a pipe 5 for connecting the feeder 3 and the bushing 4, wherein the apparatus produces the glass fiber 2f by discharging, from a nozzle hole 6, the molten glass 2 fed from the feeder 3 through the pipe 5 to the bushing 4, in a state where a flow passage from the feeder 3 to the nozzle hole 6 of the bushing 4 is filled with the molten glass 2. In the apparatus for producing the glass fiber, the pipe 5 includes: a first pipe 5a connected to the feeder 3; and a second pipe 5b connected to the bushing 4, wherein the pipe is configured such that a relative position in a vertical direction can be changed between the first pipe 5a and the second pipe 5b.SELECTED DRAWING: Figure 1

Description

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

As the glass fiber, a glass fiber having a circular cross section and a deformed cross-section glass fiber having a flat cross section (see Patent Document 1) are manufactured. Since glass fiber can realize a high reinforcing effect when kneaded with a resin and composited, it is used in various fields such as being used as a fiber for fiber reinforced plastic (FRP).

Here, as an example of a method for producing glass fiber, the following method can be mentioned.

In order to carry out this method, a feeder for distributing molten glass produced in a glass melting furnace or the like and a bushing arranged below the feeder are used. The bushing is provided with a large number of nozzles, and each nozzle is provided with a nozzle hole for allowing molten glass to flow out. Using these manufacturing facilities, the flow path from the inside of the feeder to the nozzle hole of the bushing is filled with molten glass, the molten glass is supplied from the feeder to the bushing, and the molten glass flows out from the nozzle hole of each nozzle. Cool while pulling out the glass. The glass fiber is manufactured in this way.

International Publication No. 2017/221471

However, the above method has the following problems to be solved.

When changing the manufacturing conditions of glass fibers, it is necessary to replace the manufacturing equipment, which makes it difficult to respond promptly to the changes in the manufacturing conditions. As an example of changing the manufacturing conditions, the production target is switched between the glass fiber having a circular cross section and the deformed cross section glass fiber, the flatness ratio of the deformed cross section glass fiber to be manufactured is changed, or the glass composition is changed. For example, when changing. The reason why it is necessary to replace the manufacturing equipment as described above is that the head pressure (pressure for letting the molten glass flow out from the nozzle hole), which is determined by the height difference between the nozzle hole and the liquid level of the molten glass in the feeder, is optimal. This is because the size varies depending on the manufacturing conditions. As a result, when changing the manufacturing conditions, it is necessary to change the above-mentioned height difference for the purpose of adjusting the head pressure to the optimum size, and for that purpose, it is necessary to replace the manufacturing equipment.

It is a technical subject of the present invention made in view of the above circumstances to enable rapid changes in the manufacturing conditions of glass fibers.

The glass fiber manufacturing apparatus for solving the above problems includes a feeder for circulating molten glass, a bushing provided with a nozzle hole and arranged below the feeder, and a pipe connecting the feeder and the bushing. In the state where the flow path from the inside of the feeder to the nozzle hole of the bushing is filled with molten glass, the molten glass supplied from the feeder to the bushing via the pipe is discharged from the nozzle hole to produce glass fiber. In the device, the pipes include a first pipe connected to a feeder and a second pipe connected to a bushing, and the relative position change in the vertical direction between the first pipe and the second pipe. It is characterized by being possible.

In this manufacturing apparatus, it is possible to change the relative position in the vertical direction between the first pipe connected to the feeder and the second pipe connected to the bushing. As a result, as the relative positions of both pipes are changed, the relative positions of the feeder and the bushing in the vertical direction can also be changed. That is, by changing the relative positions of both pipes, it is possible to freely change the magnitude of the head pressure determined by the height difference between the nozzle hole and the liquid level of the molten glass in the feeder. Therefore, when changing the manufacturing conditions of the glass fiber, it is not necessary to replace the manufacturing equipment for the purpose of adjusting the head pressure to the optimum size. As a result, the manufacturing conditions can be changed quickly.

In the above device, it is preferable that a part of the first pipe and a part of the second pipe form a double pipe structure.

In this way, by forming a double pipe structure with a part of the first pipe and a part of the second pipe, the space of the manufacturing equipment can be saved, and the first pipe and the second pipe can be saved. It is possible to change the relative position between and.

In the above device, it is preferable that a part of the first pipe forms an inner cylinder having a double pipe structure and a part of the second pipe forms an outer cylinder having a double pipe structure.

In this way, it is possible to prevent or suppress the leakage of the molten glass from the flow path (the pipe including the first pipe and the second pipe) from the feeder to the bushing.

The above device preferably includes a temperature control means for cooling the molten glass existing in the upper opening of the second pipe.

In this way, the molten glass existing in the upper opening of the second pipe is cooled by the temperature controlling means and solidified, so that the solidified glass forms a lid in the upper opening of the second pipe. Therefore, leakage of the molten glass from the flow path (pipe) can be prevented or suppressed. By stopping the cooling by the temperature controlling means, the lid of the upper opening is removed. As a result, it is possible to prevent the solidified glass from becoming an obstacle when changing the relative positions of the first pipe and the second pipe.

In the above device, it is preferable that the temperature control means is a cooling pipe arranged along the upper opening of the second pipe and configured to allow the refrigerant to flow inside.

In this way, when the relative positions of the first pipe and the second pipe are changed, the second pipe and the cooling pipe can be moved integrally.

In the above apparatus, it is preferable that the first pipe and the second pipe are individually heated.

In this way, it becomes easy to appropriately adjust the viscosity of the molten glass flowing into the first pipe from the feeder and the viscosity of the molten glass flowing into the bushing from the second pipe.

In the above device, it is preferable that only the portion of each portion of the first pipe located above the upper opening of the second pipe is heated.

In this way, unlike the case where each part of the first pipe is heated not only in the part located above the upper opening of the second pipe but also in the part located below, the molten glass is formed. It is possible to prevent the molten glass flowing into the bushing from becoming excessively viscous due to excessive heating.

In the above device, it is preferable that the nozzle hole has a flat shape.

In this way, by changing the head pressure by changing the relative positions of the first pipe and the second pipe, it is possible to produce irregular cross-section glass fibers having various flatnesses.

Further, a method for manufacturing glass fiber for solving the above problems is a feeder for circulating molten glass, a bushing provided with a nozzle hole and arranged below the feeder, and a pipe connecting the feeder and the bushing. In a state where the flow path from the inside of the feeder to the nozzle hole of the bushing is filled with molten glass, the molten glass supplied from the feeder to the bushing via the pipe is discharged from the nozzle hole to produce glass fiber. The method includes a first pipe connected to a feeder and a second pipe connected to a bushing, and the relative position in the vertical direction is changed between the first pipe and the second pipe. Is possible.

In the present manufacturing method, the above-mentioned actions and effects can be similarly obtained in the above description of the glass fiber manufacturing apparatus.

According to the present invention, it is possible to quickly change the manufacturing conditions of glass fibers.

It is sectional drawing which shows the manufacturing apparatus of a glass fiber. (A) to (d) are cross-sectional views showing the periphery of a cooling pipe provided in a glass fiber manufacturing apparatus. It is sectional drawing which shows the irregular cross-sectional glass fiber. It is sectional drawing which shows the glass fiber which has a circular cross section. It is sectional drawing which shows the periphery of the nozzle provided in the glass fiber manufacturing apparatus. It is a bottom view which shows the periphery of the nozzle provided in the glass fiber manufacturing apparatus. (A) is a side view showing a nozzle provided in a glass fiber manufacturing apparatus, (b) is a cross-sectional view, and (c) is a bottom view.

Hereinafter, the glass fiber manufacturing apparatus and manufacturing method according to the embodiment will be described with reference to the accompanying drawings.

In the present embodiment, in executing the glass fiber manufacturing method (hereinafter referred to as the present manufacturing method), the glass fiber manufacturing apparatus 1 (hereinafter referred to as the manufacturing apparatus 1) shown in FIG. 1 is used.

The manufacturing apparatus 1 includes a feeder 3 for distributing the molten glass 2, a bushing 4 arranged below the feeder 3, and a pipe 5 for connecting the feeder 3 and the bushing 4. The molten glass 2 is supplied from the feeder 3 to the bushing 4 via the pipe 5. Then, the molten glass 2 is cooled while flowing out from the nozzle hole 6 of the bushing 4 to become the glass fiber 2f.

In the present embodiment, the molten glass 2 is made of E glass. However, this is not limited, and the molten glass 2 may be made of other glass such as D glass, S glass, AR glass, and C glass.

The feeder 3 is connected to a glass melting furnace (not shown). The feeder 3 can distribute the molten glass 2 continuously produced in the glass melting furnace. A liquid level 2a of the molten glass 2 is formed inside the feeder 3.

The bushing 4 is provided with a base plate 7 at the bottom. The base plate 7 is provided with a plurality of nozzles 8 and cooling pipes 9 arranged in the vicinity of these nozzles 8. The plurality of nozzles 8 have the same configuration as each other. Although details will be described later, the nozzle holes 6 provided in each nozzle 8 have a flat shape.

The pipe 5 includes a first pipe 5a connected to the feeder 3 and a second pipe 5b connected to the bushing 4. The positions of the first pipe 5a and the second pipe 5b can be changed in the vertical direction. As a result, the relative positions of the feeder 3 and the bushing 4 can be changed in the vertical direction.

The present manufacturing method includes a step of changing the relative positions of the first pipe 5a and the second pipe 5b (relative positions of the feeder 3 and the bushing 4) when the manufacturing conditions of the glass fiber 2f are changed. When changing the manufacturing conditions, (1) when switching the production target between the glass fiber having a circular cross section and the deformed cross section glass fiber, and (2) when changing the flatness ratio of the deformed cross section glass fiber to be manufactured. (3) The case where the glass composition is changed and the like can be mentioned.

In the present embodiment, the position of the feeder 3 is fixed, so that the position of the first pipe 5a connected to the feeder 3 is also fixed. On the other hand, the bushing 4 and the second pipe 5b connected to the bushing 4 can move both 4 and 5b up and down as a unit. Then, by moving the second pipe 5b up and down as shown by arrows AA, the relative positions of the first pipe 5a and the second pipe 5b are changed. Further, the bushing 4 moves up and down as the second pipe 5b moves up and down, and the relative positions of the feeder 3 and the bushing 4 are changed.

Here, the bushing 4 moves up and down with the position shown by the solid line in FIG. 1 as the upper limit position and the position shown by the alternate long and short dash line as the lower limit position. The distance that the bushing 4 (second pipe 5b) can move up and down is preferably 100 mm or more. When moving the bushing 4 (second pipe 5b) up and down, for example, a lifting means such as a hydraulic jack may be used to raise and lower the bushing 4 or the second pipe 5b while supporting the bushing 4.

Each of the first pipe 5a and the second pipe 5b has a pipe axis extending in the vertical direction. The shapes of both pipes 5a and 5b are not particularly limited, but in the present embodiment, both pipes 5a and 5b are formed in a cylindrical shape. The upper opening of the first pipe 5a is connected to the bottom of the feeder 3, and the lower opening of the second pipe 5b is connected to the upper end of the bushing 4.

A part of the first pipe 5a and a part of the second pipe 5b have a double pipe structure. Specifically, the first pipe 5a is formed to have a smaller pipe diameter than the second pipe 5b, and a part of the first pipe 5a forms an inner cylinder having a double pipe structure and a part of the second pipe is formed. It has an outer cylinder with a double pipe structure. In the double pipe structure, a gap is formed between the outer peripheral surface of the first pipe 5a and the inner peripheral surface of the second pipe 5b to allow the molten glass 2 to enter. By providing this gap, it is possible to prevent the first pipe 5a and the second pipe 5b from being fitted due to thermal expansion or the like, and the relative positions of both pipes 5a and 5b can be smoothly changed. The width of the gap is preferably 3 mm or more.

The upper opening of the second pipe 5b is provided with a cooling pipe 10 as a temperature controlling means. The cooling pipe 10 can be moved up and down integrally with the second pipe 5b, and the position shown by the solid line in FIG. 1 is the upper limit position and the position shown by the alternate long and short dash line is the lower limit position. The cooling pipe 10 forms an annular shape along the upper opening of the second pipe 5b in a plan view, and cold water 10a as a refrigerant can be circulated inside. Of course, a refrigerant other than the cold water 10a may be used as the refrigerant, or a refrigerant other than the cooling pipe 10 may be used as the temperature controlling means.

When the cold water 10a is supplied to the cooling pipe 10, the molten glass 2 existing in the upper opening of the second pipe 5b is cooled and the molten glass 2 is solidified (the cross-hatched portion in FIG. 1 is solidified. Glass). The solidified glass can prevent the molten glass 2 from leaking from the upper opening of the second pipe 5b. On the other hand, when the supply of the cold water 10a to the cooling pipe 10 is stopped, the temperature of the solidified glass rises and the molten glass 2 is formed again.

The supply of the cold water 10a to the cooling pipe 10 and the stop of the supply are switched when the relative positions of the first pipe 5a and the second pipe 5b are changed. As a specific example, there is a case where the relative positions of both pipes 5a and 5b are changed by moving the second pipe 5b upward with respect to the first pipe 5a whose position is fixed.

As shown in FIG. 2A, while the cooling water 10a is being supplied to the cooling pipe 10, the upper opening of the second pipe 5b is covered with solidified glass (represented by cross-hatching). It is in a state of being. At this time, the first pipe 5a and the second pipe 5b are connected via solidified glass, and the relative positions of both pipes 5a and 5b cannot be changed. In moving the second pipe 5b upward, first, as shown in FIG. 2B, the supply of the cold water 10a to the cooling pipe 10 is stopped, and the solidified glass is returned to the molten glass 2. This makes it possible to change the relative positions of both pipes 5a and 5b. Then, under the state where the supply of the cold water 10a is stopped, the second pipe 5b is moved upward to a desired position as shown by an arrow B in FIG. 2C. Finally, as shown in FIG. 2D, the supply of the cold water 10a to the cooling pipe 10 is restarted, and the molten glass 2 existing in the upper opening of the second pipe 5b is solidified again.

Of course, contrary to the above specific example, when the relative position between the first pipe 5a and the second pipe 5b is changed by moving the second pipe 5b downward, FIG. 2 (c) ), The second pipe 5b may be moved downward to a desired position.

As shown in FIG. 1, the first pipe 5a and the second pipe 5b can be individually heated by the first heater 11 and the second heater 12. In the present embodiment, the first heater 11 and the second heater 12 are in the form of heating the first pipe 5a and the second pipe 5b by energization heating, respectively.

The upper end of the section to be energized and heated in the first pipe 5a is the upper opening of the first pipe 5a. On the other hand, the lower end of the section to be energized and heated in the first pipe 5a is located further above the upper opening of the second pipe 5b which has been moved to the upper limit position. As a result, of each portion of the first pipe 5a, only the portion located above the upper opening of the second pipe 5b is heated.

The upper end of the section to be energized and heated in the second pipe 5b is located downwardly separated from the upper opening of the second pipe 5b. This prevents the cooling of the molten glass 2 existing in the upper opening by the cold water 10a from being hindered by the energization heating. The distance from the upper opening of the section to be energized and heated is preferably 100 mm or more. On the other hand, the lower end of the section to be energized and heated in the second pipe 5b is the lower opening of the second pipe 5b.

A part or the whole of each member of the bushing 4, the pipe 5 (first pipe 5a, the second pipe 5b), the nozzle 8, and the cooling pipe 9 (the part in contact with the molten glass 2) is pure platinum or a platinum alloy (platinum). It is composed of rhodium alloy, etc.) or reinforced platinum (platinum containing zirconia, etc.). In the present embodiment, the pipe 5 (first pipe 5a, second pipe 5b) is entirely composed of pure platinum, a platinum alloy, or reinforced platinum.

The flow path from the connection portion between the feeder 3 and the pipe 5 (first pipe 5a) to the nozzle hole 6 of the bushing 4 is filled with the molten glass 2. Therefore, the pressure (head pressure) for flowing out the molten glass 2 from the nozzle hole 6 is determined by the height difference H between the nozzle hole 6 and the liquid level 2a of the molten glass 2 in the feeder 3. Since the second pipe 5b can move up and down as described above, the value of the height difference H can be adjusted by the distance that the second pipe 5b can move up and down.

Here, among the cases where the production conditions of the glass fiber 2f are changed, in the case of the above (1), when switching from the production of the irregular cross-section glass fiber (FIG. 3) to the production of the glass fiber having a circular cross section (FIG. 4). Decreases the height difference H, and conversely increases the height difference H when switching from the production of glass fibers having a circular cross section to the production of glass fibers having a modified cross section. Further, in the case of the above (2), when the flatness of the deformed cross-section glass fiber to be manufactured is increased, the height difference H is increased, and conversely, when the flatness is decreased, the height difference H is decreased. Further, in the case of (3) above, when changing the glass composition to a composition having a high viscosity, the height difference H is increased, and conversely, when changing to a composition having a low viscosity, the height difference H is decreased.

Temperature and viscosity of the molten glass 2 at the time of molding a glass fiber. 2f, 1100 ° C. to 1250 ° C., respectively (preferably ^{1150 ℃ ~1200 ℃), 10 2.6} dPa · s~10 3.8 dPa · s ( preferably Is set to 10 ^2.9 dPa · ^{s-10 3.3} dPa · s). The "temperature / viscosity of the molten glass 2" referred to here is the temperature / viscosity of the molten glass 2 at the position where it flows into the nozzle 8. The temperature and viscosity of the molten glass 2 may be adjusted by, for example, heating the pipe 5 (first pipe 5a, second pipe 5b), heating the pipe 5, and heating the bushing 4. In addition, the temperature and viscosity of the molten glass 2 may be adjusted by heating the molten glass 2 and the feeder 3 in the glass melting furnace by energization heating or the like.

A sizing agent is applied to the surface of the glass fiber 2f by an applicator (not shown). As a result, hundreds to thousands of glass fibers 2f are spun as one strand 2s. The spun strand 2s is wound around the bobbin 13 which is a winding device as a fiber bundle 2r. The strand 2s is cut to a length of, for example, about 1 mm to 20 mm and used as a chopped strand.

As shown in FIGS. 5 and 6, the nozzle 8 has a pair of long wall portions 14, 14 and a pair of short wall portions 15, 15. A flat nozzle hole 6 is formed by being surrounded by these wall portions. The nozzle hole 6 has an inflow port 6a and an outflow port 6b of the molten glass 2. Each of the pair of long wall portions 14, 14 is provided with a notch portion 16 having an opening toward the outlet 6b side. As a result, the nozzle hole 6 is connected to the external space of the nozzle 8 through the notch 16.

The cooling pipe 9 cools the molten glass 2 by circulating cooling water 17 inside the cooling pipe 9. The outer shape of the cooling pipe 9 is formed in a plate shape, and the plate surface is parallel to the long wall portion 14. The cooling pipe 9 is not an essential configuration and may be omitted.

A plurality of nozzle rows P are arranged in parallel on the base plate 7 at intervals. A plurality of nozzles 8 belong to each nozzle row P. The plurality of nozzles 8 belonging to the same nozzle row P are arranged so that the nozzle holes 6 formed therein are located on the same straight line.

The cooling pipe 9 is arranged so as to extend in parallel with the nozzle row P between the adjacent nozzle rows P and P. As a result, the molten glass 2 in the nozzle hole 6 is cooled through the notch 16 facing the cooling pipe 9. Specifically, the molten glass 2 is rapidly cooled from a temperature of 1000 ° C. or higher by the cooling pipe 9.

As shown in FIGS. 7 (a) to 7 (c), the notch portion 16 provided in the long wall portion 14 of each nozzle 8 has an isobaric shape in which the upper base is shorter than the lower base. As a result, the opening width of the notch portion 16 gradually increases as the nozzle hole 6 shifts from the inflow port 6a side to the outflow port 6b side.

The nozzle hole 6 is formed in an elongated hole shape. The shape of the nozzle hole 6 is not limited to the elongated hole shape, and may be, for example, an elliptical shape. The pair of long wall portions 14, 14 face each other in the minor axis direction of the nozzle hole 6, and the pair of short wall portions 15, 15 face each other in the major axis direction of the nozzle hole 6. The flatness ratio (ratio of major axis to minor axis) of the nozzle hole 6 is 2 to 5. The inner peripheral surface of the nozzle hole 6 (including the inner wall surface 14a of the long wall portion 14 and the inner wall surface 15a of the short wall portion 15) is made of pure platinum, a platinum alloy, or reinforced platinum.

Hereinafter, the main actions / effects of this manufacturing method using the manufacturing apparatus 1 will be described.

In this manufacturing method, the relative position in the vertical direction can be changed between the first pipe 5a connected to the feeder 3 and the second pipe 5b connected to the bushing 4. By changing the relative positions of both pipes 5a and 5b in this way, the size of the head pressure determined by the height difference H between the nozzle hole 6 and the liquid level 2a of the molten glass 2 in the feeder 3 can be freely changed. It becomes possible to make it. Therefore, when changing the manufacturing conditions of the glass fiber 2f, it is not necessary to replace the manufacturing equipment for the purpose of adjusting the head pressure to the optimum size. As a result, the manufacturing conditions can be changed quickly.

Here, the glass fiber manufacturing apparatus and manufacturing method according to the present invention are not limited to the configurations and embodiments described in the above embodiments. For example, in the above embodiment, the positions of the first pipe 5a and the feeder 3 are fixed, and the second pipe 5b and the bushing 4 can be moved up and down, but the present invention is not limited to this. Contrary to the above embodiment, the positions of the second pipe 5b and the bushing 4 may be fixed so that the first pipe 5a and the feeder 3 can be moved up and down. Further, both the first pipe 5a and the feeder 3 and the second pipe 5b and the bushing 4 may be allowed to move up and down.

Further, in the above embodiment, the nozzle hole 6 has a flat shape, but the nozzle hole 6 may be formed in a circular shape. When the nozzle hole 6 is circular, in manufacturing the glass fiber 2f having a circular cross section, the relative positions of the first pipe 5a and the second pipe 5b in the vertical direction are changed, and the magnitude of the height difference H is adjusted. Therefore, it is possible to adjust the value of the diameter of the glass fiber 2f.

Further, in the above embodiment, the upper opening of the second pipe 5b is covered with solidified glass, but this is not the case. A member having a function as a lid may be installed in the upper opening of the second pipe 5b. However, from the viewpoint of smoothly changing the relative positions of the first pipe 5a and the second pipe 5b, the upper opening of the second pipe 5b is covered with solidified glass as in the above embodiment. Is preferable.

Further, in the above embodiment, the pipe 5 is composed of the first pipe 5a and the second pipe 5b, but another pipe may be arranged between them. At least one of these three pipes may be moved up and down.

1 Glass fiber manufacturing equipment 2 Fused glass 2f Glass fiber 3 Feeder 4 Bushing 5 Pipe 5a First pipe 5b Second pipe 6 Nozzle hole 10 Cooling pipe 10a Cold water

Claims (9)

It is provided with a feeder for circulating molten glass, a bushing provided with a nozzle hole and arranged below the feeder, and a pipe connecting the feeder and the bushing.
In a state where the flow path from the inside of the feeder to the nozzle hole of the bushing is filled with molten glass, the molten glass supplied from the feeder to the bushing via the pipe is discharged from the nozzle hole. A glass fiber manufacturing device that manufactures glass fibers.
The pipe includes a first pipe connected to the feeder and a second pipe connected to the bushing.
A glass fiber manufacturing apparatus characterized in that the relative position in the vertical direction can be changed between the first pipe and the second pipe. The glass fiber manufacturing apparatus according to claim 1, wherein a part of the first pipe and a part of the second pipe form a double-tube structure. The glass according to claim 2, wherein a part of the first pipe forms an inner cylinder of the double pipe structure, and a part of the second pipe forms an outer cylinder of the double pipe structure. Fiber manufacturing equipment. The glass fiber manufacturing apparatus according to claim 3, further comprising a temperature control means for cooling the molten glass existing in the upper opening of the second pipe. The glass according to claim 4, wherein the temperature controlling means is a cooling pipe arranged along the upper opening of the second pipe and configured to allow a refrigerant to flow inside. Fiber manufacturing equipment. The glass fiber manufacturing apparatus according to any one of claims 1 to 5, wherein the first pipe and the second pipe are configured to be individually heated. The production of the glass fiber according to claim 6, wherein only the portion of each portion of the first pipe located above the upper opening of the second pipe is heated. Device. The glass fiber manufacturing apparatus according to any one of claims 1 to 7, wherein the nozzle hole has a flat shape. Using a feeder for circulating molten glass, a bushing provided with a nozzle hole and arranged below the feeder, and a pipe connecting the feeder and the bushing,
With the flow path from the inside of the feeder to the nozzle hole of the bushing filled with molten glass, the molten glass supplied from the feeder to the bushing via the pipe is allowed to flow out from the nozzle hole to be glass fiber. It is a manufacturing method of glass fiber to manufacture
The pipe includes a first pipe connected to the feeder and a second pipe connected to the bushing.
A method for producing glass fiber, which comprises being able to change the relative position in the vertical direction between the first pipe and the second pipe.

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