JP7739865B2 - Glass fiber manufacturing apparatus and glass fiber manufacturing method - Google Patents

Description

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

As described in Patent Document 1, glass fiber production uses a manufacturing device that includes a feeder for circulating molten glass and a bushing that is positioned below the feeder and has multiple nozzles through which the molten glass flows. With this type of glass fiber manufacturing device, multiple glass filaments can be formed by causing molten glass to flow from each nozzle of the bushing.

JP 2012-091954 A

In the conventional glass fiber manufacturing apparatus described above, if the temperature of the molten glass supplied from the feeder to the bushing is low, it is necessary to heat the molten glass by passing electricity through the bushing. However, in this case, there is a risk that the molten glass will not be heated sufficiently within the bushing, or that the temperature of the bushing nozzle will rise excessively due to the passage of electricity, resulting in unstable glass filament formation.

The object of the present invention is to provide a glass fiber manufacturing apparatus and a glass fiber manufacturing method that enable stable molding of glass filaments.

A glass fiber manufacturing device that solves the above problem is a glass fiber manufacturing device that includes a feeder for circulating molten glass and a bushing that is positioned below the feeder and has multiple nozzles through which the molten glass flows. The device also includes a heat-generating element that generates heat when electricity is applied, and the heat-generating element has a heat-generating portion that is positioned in the flow path of the molten glass between the feeder and the bushing.

With this configuration, when the temperature of the molten glass flowing down from the feeder is low, the molten glass can be heated by the heat-generating portion of the heat-generating element located in the flow path between the feeder and the bushing. This allows molten glass that has been heated to a predetermined temperature to be supplied to the bushing. This makes it possible to stabilize the temperature of the molten glass in the bushing.

In the above-described glass fiber manufacturing apparatus, the heat-generating portion of the heat-generating member may be composed of a plate member arranged to separate the flow path of the molten glass, and the heat-generating portion of the heat-generating member may have through holes through which the molten glass flows. This configuration increases the contact area between the heat-generating portion of the heat-generating member and the molten glass, making it possible, for example, to efficiently heat the molten glass and increase the temperature uniformity of the molten glass.

In the above-described glass fiber manufacturing apparatus, the heat generating portion of the heat generating member may have a plurality of through holes, thereby providing a plurality of flow sections with different opening ratios. This configuration makes it possible to complicate the flow of molten glass. This, for example, makes it possible to increase the temperature uniformity of the molten glass.

In the above-described glass fiber manufacturing apparatus, the heat-generating member may include a first heat-generating member and a second heat-generating member positioned downstream of the first heat-generating member at a distance from the first heat-generating member. With this configuration, the heat-generating portion of the first heat-generating member and the heat-generating portion of the second heat-generating member can further increase the temperature of the molten glass in the flow path between the feeder and the bushing. As a result, even if the temperature of the molten glass flowing down from the feeder is lower, molten glass heated to a predetermined temperature can be supplied to the bushing. This stabilizes the flow of molten glass from the nozzle of the bushing.

In the above-described glass fiber manufacturing apparatus, the heat-generating member includes a first heat-generating member and a second heat-generating member disposed downstream of the first heat-generating member and spaced apart from the first heat-generating member, and the heat-generating portion of the first heat-generating member and the heat-generating portion of the second heat-generating member are composed of a plate material arranged to separate the flow path of the molten glass, and the heat-generating portion of the first heat-generating member and the heat-generating portion of the second heat-generating member may have through holes through which the molten glass flows.

This configuration increases the contact area between the heat-generating portion of the first heat-generating element and the molten glass, and the contact area between the heat-generating portion of the second heat-generating element and the molten glass. This makes it possible, for example, to heat the molten glass more efficiently and increase the temperature uniformity of the molten glass.

In the above-described glass fiber manufacturing apparatus, the first heat-generating element and the second heat-generating element may each have a plurality of flow sections with different opening ratios, and the flow sections of the first heat-generating element and the flow sections of the second heat-generating element may be arranged so that they have different opening ratios along the flow direction of the molten glass. This configuration makes it possible to make the flow of molten glass more complex. This, for example, makes it possible to further increase the temperature uniformity of the molten glass.

In the above-mentioned glass fiber manufacturing apparatus, the heat-generating member and the bushing may be positioned separately. With this configuration, for example, when both the bushing and the heat-generating member are heated, it becomes possible to control the temperatures of both separately.

The glass fiber manufacturing apparatus may further include an insulating member disposed between the heat-generating member and the bushing. This configuration, for example, can increase the efficiency of current flow to the heat-generating member, thereby allowing the heat-generating section to generate heat efficiently. Furthermore, for example, by preventing welding between the heat-generating member and the bushing, it becomes possible to easily replace the heat-generating member or the bushing.

A glass fiber manufacturing method that solves the above problem is a glass fiber manufacturing method that includes a molding step in which glass filaments are molded using a glass fiber manufacturing apparatus, wherein the glass fiber manufacturing apparatus includes a feeder that circulates molten glass, a bushing that is positioned below the feeder and has multiple nozzles through which the molten glass flows, and a heat-generating element that generates heat when energized, wherein the heat-generating element has a heat-generating portion that is positioned in the flow path of the molten glass between the feeder and the bushing, and the molten glass is heated by the heat-generating element during the molding step.

The present invention makes it possible to stably mold glass filaments.

1 is a cross-sectional view showing a glass fiber manufacturing apparatus according to a first embodiment. FIG. FIG. FIG. 10 is a cross-sectional view showing a glass fiber manufacturing apparatus according to a second embodiment. FIG. FIG. 10 is a plan view showing a heat generating member according to a modified example.

(First embodiment)
Hereinafter, a first embodiment of a glass fiber manufacturing apparatus and a glass fiber manufacturing method will be described with reference to the drawings. Note that, for the sake of convenience, the drawings may show parts of the configuration exaggerated or simplified. Furthermore, the dimensional ratios of each part may differ from the actual ratios.

As shown in FIG. 1, the glass fiber manufacturing apparatus 11 includes a feeder 12 that circulates molten glass MG and a bushing 13 that is positioned below the feeder 12. The glass fiber manufacturing apparatus 11 also includes a heat-generating member 14 that generates heat when electricity is applied. The glass fiber manufacturing apparatus 11 of this embodiment also includes an insulating member 15 that is positioned between the heat-generating member 14 and the bushing 13.

<Feeder 12>
Molten glass MG obtained in a glass melting furnace (not shown) is supplied to a feeder 12 of a glass fiber manufacturing apparatus 11. The feeder 12 is made up of a refractory wall. Examples of refractories constituting the refractory wall include electrocast bricks and dense fired bricks. Examples of electrocast bricks include zirconia-based electrocast bricks, alumina-based electrocast bricks, alumina-zirconia-based electrocast bricks, and alumina-zirconia-silica-based electrocast bricks. Examples of dense fired bricks include dense zircon bricks and dense chrome bricks.

The feeder 12 includes a flow block 12a that forms a flow path for the molten glass MG to flow down. The flow block 12a is also made of a refractory material.
Examples of the glass for the molten glass MG include E-glass (glass with an alkali content of 2% or less), D-glass (low dielectric constant glass), AR-glass (alkali-resistant glass), C-glass (acid-resistant glass), M-glass (high elastic modulus glass), S-glass (high strength, high elastic modulus glass), T-glass (high strength, high elastic modulus glass), H-glass (high dielectric constant glass), and NE-glass (low dielectric constant glass). The density of the glass is, for example, 2.0 to 3.0 g/ ^cm3 .

<Bushing 13>
The bushing 13 of the glass fiber manufacturing apparatus 11 has a plurality of nozzles N through which the molten glass MG flows. Each nozzle N of the bushing 13 can form a glass filament GF.

The bushing 13 comprises a bushing body 13a to which molten glass MG is supplied, and a base plate 13b attached to the bottom of the bushing body 13a. The top of the bushing body 13a has a supply port through which molten glass MG is supplied from the feeder 12. The bushing 13 is supported by the feeder 12, etc., via a support member S.

The glass fiber manufacturing apparatus 11 of this embodiment includes a bushing block 16 arranged below the flow block 12a of the feeder 12. The bushing block 16 forms a flow path for the molten glass MG between the feeder 12 and the bushing 13. The molten glass MG that flows down the flow path formed by the bushing block 16 is supplied to the bushing body 13a. The bushing block 16 is made of, for example, the non-conductive refractory material described above.

The bushing body 13a may have a screen for preventing foreign matter from accumulating on the base plate 13b, a terminal for electrical conduction, and the like.
The base plate 13b is provided with a plurality of nozzles N. The number of nozzle holes in the bushing 13 is preferably within a range of 100 to 10,000. The shape of the nozzle hole in each nozzle N in the bushing 13 may be, for example, a circular shape or a flat shape having a major axis and a minor axis.

The bushing body 13a, base plate 13b, and nozzle N may be made of, for example, a precious metal or a precious metal alloy. Precious metals include gold, silver, platinum, palladium, rhodium, iridium, ruthenium, and osmium. From the perspective of enhancing durability, the bushing body 13a, base plate 13b, and nozzle N are preferably made of platinum or a platinum alloy. An example of a platinum alloy is a platinum-rhodium alloy.

<Heat-generating member 14>
The heat-generating member 14 of the glass fiber manufacturing apparatus 11 has a heat-generating portion 14a arranged in the flow path of the molten glass MG between the feeder 12 and the bushing 13, and a terminal portion 14b for current flow connected to the heat-generating portion 14a. The heat-generating member 14 is arranged away from the bushing 13. Specifically, the heat-generating member 14 is arranged so as not to come into contact with the bushing 13.

The heat generating portion 14a of the heat generating member 14 is composed of a plate material arranged to separate the flow path of the molten glass MG. The heat generating portion 14a has through holes TH that allow the molten glass MG to flow. The heat generating portion 14a has multiple through holes TH, and therefore has multiple flow sections with different opening rates.

As shown in FIG. 2, the heat generating portion 14a of this embodiment has a first circulating portion A1, a second circulating portion A2, and a third circulating portion A3. The first circulating portions A1 consist of a pair located on both ends of the heat generating portion 14a. The second circulating portions A2 consist of a pair adjacent to the inside of each first circulating portion A1. The third circulating portion A3 is located between the pair of second circulating portions A2.

If the opening rate of the first circulating portion A1 is RA1 [%], the opening rate of the second circulating portion A2 is RA2 [%], and the opening rate of the third circulating portion A3 is RA3 [%], the relationship RA1 < RA3 < RA2 may be satisfied. The opening rate RA1 of the first circulating portion A1 is, for example, in the range of 1% or more and 20% or less. The opening rate RA2 of the second circulating portion A2 is, for example, in the range of more than 60% and less than 90%. The opening rate RA3 of the third circulating portion A3 is, for example, in the range of more than 20% and less than 60%.

The shape of the through-hole TH of the heat generating portion 14a may be, for example, a circle, an ellipse, a polygon, a slit, or the like.
The terminal portions 14b are connected to both sides of the heat generating portion 14a, respectively, and the pair of terminal portions 14b are connected to a power source 17 as shown in FIG.

The material of the heat generating member 14 is not particularly limited as long as it can be used as a resistance heating element, and examples include metals and ceramics. Examples of metals include molybdenum, platinum, and platinum alloys. Examples of platinum alloys include platinum-rhodium alloys.

<Insulating member 15>
1 and 3, the insulating member 15 of the glass fiber manufacturing apparatus 11 electrically insulates the heat-generating member 14 from the bushing 13. As shown in Fig. 3, the insulating member 15 has an overall shape, for example, a frame shape, and has an insulating member flow path portion 15a that penetrates vertically. Examples of materials for the insulating member 15 include refractories. The insulating member 15 may have a single-layer structure or a multi-layer structure.

<Configuration other than the above>
The glass fiber manufacturing apparatus 11 includes an applicator and a gathering shoe (not shown). The applicator applies a liquid sizing agent to the numerous glass filaments GF drawn out from the bushing 13. The gathering shoe focuses the numerous glass filaments GF to which the sizing agent has been applied. A glass strand is obtained by focusing the numerous glass filaments GF by the gathering shoe. The glass strand is wound by a winding device, and a cake of wound glass strands is obtained.

<Glass fiber manufacturing method>
Next, the method for producing glass fibers will be described together with the main effects thereof.
The glass fiber manufacturing method includes a forming step of forming glass filaments GF using a glass fiber manufacturing apparatus 11. In the forming step, molten glass MG is supplied from a feeder 12 to a bushing 13. A flow path for the molten glass MG from the feeder 12 to the bushing 13 and the inside of a bushing body 13a of the bushing 13 are filled with the molten glass MG. In the forming step, the molten glass MG supplied to the bushing 13 is made to flow out of a nozzle N of the bushing 13, thereby forming glass filaments GF.

At this time, the glass fiber manufacturing apparatus 11 is equipped with the above-mentioned heating element 14. With this configuration, when the temperature of the molten glass MG flowing down from the feeder 12 is low, the molten glass MG can be heated by the heating portion 14a of the heating element 14, which is arranged in the flow path between the feeder 12 and the bushing 13. This makes it possible to supply molten glass MG heated to a predetermined temperature to the bushing 13. This makes it possible to stabilize the outflow of molten glass MG from the nozzle N of the bushing 13.

Furthermore, because the molten glass MG can be heated by the heating portion 14a of the heating element 14, it is also possible to intentionally lower the temperature of the molten glass MG flowing through the feeder 12. This makes it possible to prevent the feeder 12 from being deteriorated by high-temperature molten glass MG. Furthermore, even if there is a limit to the heat generated by current flow in the bushing 13, for example, because it is necessary to prevent excessive temperature rise in the nozzle N, it is possible to maintain the temperature of the molten glass MG in the bushing 13 at an appropriate temperature. Furthermore, because it is easy to set the temperature of the molten glass MG flowing into the bushing 13 to a temperature appropriate for the type of glass, it is also possible to easily accommodate the production of a wide variety of glass fibers.

The glass filaments GF obtained in the above molding process are bundled to obtain glass strands. Glass strands can be used, for example, as chopped strands cut to a predetermined length. Glass strands can also be used as milled fiber, roving, yarn, mat, cloth, tape, or braided fabric. Applications for glass strands include, for example, vehicles, electronic materials, building materials, civil engineering, aircraft-related applications, shipbuilding, logistics, industrial machinery, and everyday items.

<Action and effect>
Next, the operation and effects of the first embodiment will be described.
(1-1) The glass fiber manufacturing apparatus 11 includes a feeder 12 for circulating molten glass MG, and a bushing 13 disposed below the feeder 12 and having a plurality of nozzles N for discharging the molten glass MG. The glass fiber manufacturing apparatus 11 includes a heat-generating member 14 that generates heat when energized. The heat-generating member 14 has a heat-generating portion 14a disposed in the flow path of the molten glass MG between the feeder 12 and the bushing 13.

With this configuration, as described above, the outflow of molten glass MG from the nozzle N of the bushing 13 can be stabilized. Therefore, it is possible to stably form the glass filament GF.

(1-2) The heat generating portion 14a of the heat generating member 14 in the glass fiber manufacturing apparatus 11 is composed of a plate material arranged to separate the flow path of the molten glass MG. The heat generating portion 14a of the heat generating member 14 has through holes TH through which the molten glass MG flows. In this case, the contact area between the heat generating portion 14a of the heat generating member 14 and the molten glass MG can be increased, making it possible, for example, to efficiently heat the molten glass MG and improve the temperature uniformity of the molten glass MG.

(1-3) The heat generating portion 14a of the heat generating member 14 in the glass fiber manufacturing apparatus 11 has multiple through holes TH, thereby providing multiple flow sections with different opening ratios. In this case, it is possible to complicate the flow of the molten glass MG. This makes it possible, for example, to increase the temperature uniformity of the molten glass MG.

(1-4) In the glass fiber manufacturing apparatus 11, the heat-generating member 14 and the bushing 13 are positioned separately. With this configuration, for example, when both the bushing 13 and the heat-generating member 14 are heated, it is possible to control the temperatures of both separately.

(1-5) The glass fiber manufacturing apparatus 11 further includes an insulating member 15 disposed between the heat-generating member 14 and the bushing 13. In this case, for example, by increasing the efficiency of current flow to the heat-generating member 14, the heat-generating portion 14a can be made to generate heat efficiently. Also, for example, by preventing welding between the heat-generating member 14 and the bushing 13, it becomes possible to easily replace the heat-generating member 14 or the bushing 13.

Second Embodiment
The second embodiment of the glass fiber manufacturing apparatus 11 and the glass fiber manufacturing method will be described, focusing on the differences from the first embodiment.

As shown in FIG. 4, the glass fiber manufacturing apparatus 11 of the second embodiment includes a first heat-generating member 18 and a second heat-generating member 19 disposed downstream of the first heat-generating member 18 and spaced apart from the first heat-generating member 18. The first heat-generating member 18 includes a heat-generating portion 18a disposed in the flow path of the molten glass MG between the feeder 12 and the bushing 13, and an electrical terminal portion 18b connected to the heat-generating portion 18a. The first heat-generating member 18 has the same configuration as the heat-generating member 14 of the first embodiment, and therefore will not be described further.

As shown in FIG. 5, the second heat-generating member 19 has a heat-generating portion 19a arranged in the flow path of the molten glass MG between the feeder 12 and the bushing 13, and an electrical terminal portion 19b connected to the heat-generating portion 19a. The heat-generating portion 19a of the second heat-generating member 19 is composed of a plate material arranged to separate the flow path of the molten glass MG. The heat-generating portion 19a of the second heat-generating member 19 has through holes TH through which the molten glass MG flows. The heat-generating portion 19a of the second heat-generating member 19 has multiple through holes TH, and thereby has multiple flow portions with different opening rates.

The heat generating portion 19a of the second heat generating member 19 has a first circulating portion B1, a second circulating portion B2, and a third circulating portion B3. The first circulating portions B1 consist of a pair located on both ends of the heat generating portion 19a of the second heat generating member 19. The second circulating portions B2 consist of a pair adjacent to the inside of each first circulating portion B1. The third circulating portion B3 is located between the pair of second circulating portions B2.

Here, the relationship between the flow section of the first heat generating member 18 and the flow section of the second heat generating member 19 will be explained. The first flow section B1 of the second heat generating member 19 is located downstream of the first flow section A1 of the first heat generating member 18. The second flow section B2 of the second heat generating member 19 is located downstream of the second flow section A2 of the first heat generating member 18. The third flow section B3 of the second heat generating member 19 is located downstream of the third flow section A3 of the first heat generating member 18.

The opening ratio of the first circulating section B1 in the second heat generating member 19 is different from the opening ratio of the first circulating section A1 in the first heat generating member 18. The opening ratio of the second circulating section B2 in the second heat generating member 19 is different from the opening ratio of the second circulating section A2 in the first heat generating member 18. The opening ratio of the third circulating section B3 in the second heat generating member 19 is different from the opening ratio of the third circulating section A3 in the first heat generating member 18. In this way, the circulating section of the first heat generating member 18 and the circulating section of the second heat generating member 19 are arranged so that they have different opening ratios along the flow direction of the molten glass MG.

More specifically, the opening rate of the first circulating portion B1 in the second heat-generating member 19 is greater than the opening rate of the first circulating portion A1 in the first heat-generating member 18. The opening rate of the second circulating portion B2 in the second heat-generating member 19 is less than the opening rate of the second circulating portion A2 in the first heat-generating member 18. The opening rate of the third circulating portion B3 in the second heat-generating member 19 is greater than the opening rate of the third circulating portion A3 in the first heat-generating member 18.

In the second heat-generating member 19, if the opening rate of the first circulating portion B1 is RB1 [%], the opening rate of the second circulating portion B2 is RB2 [%], and the opening rate of the third circulating portion B3 is RB3 [%], the relationship RB2 < RB1 < RB3 may be satisfied. The opening rate RB1 of the first circulating portion B1 is, for example, in the range of more than 20% and not more than 60%. The opening rate RB2 of the second circulating portion B2 is, for example, in the range of more than 1% and not more than 20%. The opening rate RB3 of the third circulating portion B3 is, for example, in the range of more than 60% and not more than 90%.

The glass fiber manufacturing apparatus 11 is equipped with a bushing block 16 disposed between the first heat-generating member 18 and the second heat-generating member 19. This bushing block 16 provides electrical insulation between the first heat-generating member 18 and the second heat-generating member 19. An insulating member 15 is disposed between the second heat-generating member 19 and the bushing 13.

Next, the operation and effects of the second embodiment will be described.
(2-1) The heat-generating members in the glass fiber manufacturing apparatus 11 include a first heat-generating member 18 and a second heat-generating member 19 that is disposed downstream of the first heat-generating member 18 and spaced apart from the first heat-generating member 18.

In this case, the heating portion 18a of the first heating element 18 and the heating portion 19a of the second heating element 19 can further increase the temperature of the molten glass MG in the flow path between the feeder 12 and the bushing 13. As a result, even if the temperature of the molten glass MG flowing down from the feeder 12 is lower, molten glass MG heated to a predetermined temperature can be supplied to the bushing 13. This stabilizes the flow of molten glass MG from the nozzle N of the bushing 13. This therefore enables stable forming of the glass filament GF.

(2-2) In the glass fiber manufacturing apparatus 11, the heat generating portion 18a of the first heat generating member 18 and the heat generating portion 19a of the second heat generating member 19 are composed of plates arranged to separate the flow path of the molten glass MG. The heat generating portion 18a of the first heat generating member 18 and the heat generating portion 19a of the second heat generating member 19 have through holes TH that allow the molten glass MG to flow.

In this case, the contact area between the heat generating portion 18a of the first heat generating member 18 and the molten glass MG and the contact area between the heat generating portion 19a of the second heat generating member 19 and the molten glass MG can be increased. This makes it possible, for example, to efficiently heat the molten glass MG and increase the temperature uniformity of the molten glass MG.

(2-3) The first heat generating element 18 and the second heat generating element 19 each have multiple flow sections with different opening ratios. The flow sections of the first heat generating element 18 and the flow sections of the second heat generating element 19 are arranged so that they have different opening ratios along the flow direction of the molten glass MG. In this case, it is possible to make the flow of the molten glass MG more complex. This makes it possible, for example, to further increase the temperature uniformity of the molten glass MG.

(Example of change)
This embodiment can be modified as follows: This embodiment and the following modifications can be combined and implemented within the scope of technical compatibility.

The heat generating member 14 of the first embodiment can also be changed to the heat generating member 20 shown in Figure 6. The heat generating member 20 shown in Figure 6 comprises a plate-shaped heat generating portion 20a without a through hole TH, and a terminal portion 20b for electrical conduction connected to the heat generating portion 20a. The area inside the two-dot chain line in Figure 6 is the flow path FP for the molten glass MG, and the molten glass MG flows down around the heat generating portion 20a.

At least one of the first heat generating member 18 and the second heat generating member 19 in the second embodiment may be changed to, for example, a heat generating member 20 shown in FIG.
The shape of the heat generating portion 20a of the heat generating member 20 shown in FIG. 6 may be changed to, for example, a columnar or cylindrical shape.

- In the first embodiment, the heat generating portion 14a of the heat generating member 14 has multiple circulating portions with different opening ratios, but this heat generating portion 14a can also be changed to a heat generating portion with a constant opening ratio. In the second embodiment, at least one of the heat generating portion 18a of the first heat generating member 18 and the heat generating portion 19a of the second heat generating member 19 can also be changed to a heat generating portion with a constant opening ratio.

In the heat generating portion 14a of the heat generating member 14 of the first embodiment, the number of flow sections with different opening ratios may be two, or may be four or more.
In the heat generating portion 18a of the first heat generating member 18 and the heat generating portion 19a of the second heat generating member 19 of the second embodiment, the number of flow sections with different opening rates may be two, or may be four or more.

- In the second embodiment, for example, the second heat-generating member 19 may be changed to a heat-generating member having the same configuration as the first heat-generating member 18. Also, for example, the first heat-generating member 18 may be changed to a heat-generating member having the same configuration as the second heat-generating member 19. That is, in the second embodiment, the first heat-generating member 18 and the second heat-generating member 19 may be changed to heat-generating members that are arranged so as to have the same opening ratio along the flow direction of the molten glass MG.

- The glass fiber manufacturing apparatus 11 of the second embodiment may further include a heat-generating element between the first heat-generating element 18 and the second heat-generating element 19, or between the feeder 12 and the first heat-generating element 18. In other words, the number of heat-generating elements in the glass fiber manufacturing apparatus 11 may be three or more.

- In the glass fiber manufacturing apparatus 11 of the first embodiment, the heat-generating member 14 and the bushing 13 may be arranged in contact with each other. In the glass fiber manufacturing apparatus 11 of the second embodiment, the second heat-generating member 19 and the bushing 13 may be arranged in contact with each other.

- In the glass fiber manufacturing apparatus 11 of each embodiment, the insulating member 15 can be omitted.

DESCRIPTION OF SYMBOLS 11...Glass fiber manufacturing apparatus 12...Feeder 13...Bushing 14, 20...Heat generating member 14a, 18a, 19a, 20a...Heat generating section 15...Insulating member 18...First heat generating member A1...First flow section A2...Second flow section A3...Third flow section 19...Second heat generating member B1...First flow section B2...Second flow section B3...Third flow section GF...Glass filament MG...Molten glass N...Nozzle TH...Through hole

Claims (8)

a feeder for distributing molten glass;
a bushing disposed below the feeder and having a plurality of nozzles through which the molten glass flows,
A heat generating member that generates heat when energized,
the heat generating member has a heat generating portion disposed in a flow path of the molten glass between the feeder and the bushing,
The glass fiber manufacturing apparatus , wherein the heat generating member and the bushing are disposed apart from each other . the heat generating portion of the heat generating member is made of a plate material provided so as to partition a flow path of the molten glass,
The glass fiber manufacturing device according to claim 1 , wherein the heat generating portion of the heat generating member has a through hole through which the molten glass flows. The glass fiber manufacturing apparatus of claim 2, wherein the heat generating portion of the heat generating member has a plurality of through holes, thereby providing a plurality of flow sections with different opening rates. The glass fiber manufacturing apparatus according to any one of claims 1 to 3, wherein the heat-generating member includes a first heat-generating member and a second heat-generating member positioned downstream of the first heat-generating member and spaced apart from the first heat-generating member. the heat generating member includes a first heat generating member and a second heat generating member disposed downstream of the first heat generating member and spaced apart from the first heat generating member,
the heat generating portion of the first heat generating member and the heat generating portion of the second heat generating member are formed of plate materials provided so as to separate a flow path of the molten glass,
2. The glass fiber manufacturing apparatus according to claim 1, wherein the heat generating portion of the first heat generating member and the heat generating portion of the second heat generating member have through holes through which the molten glass flows. the first heat generating member and the second heat generating member each have a plurality of flow-through portions with different opening ratios,
6. The glass fiber manufacturing apparatus according to claim 5, wherein the flow portion of the first heat generating element and the flow portion of the second heat generating element are arranged so as to have different opening ratios along the flow direction of the molten glass. The glass fiber manufacturing apparatus according to claim 1 , further comprising an insulating member disposed between the heat-generating member and the bushing . A glass fiber manufacturing method including a molding step of molding glass filaments using a glass fiber manufacturing device,
The glass fiber manufacturing apparatus includes: a feeder for circulating molten glass;
a bushing disposed below the feeder and having a plurality of nozzles through which the molten glass flows;
a heat generating member that generates heat when energized,
the heat generating member has a heat generating portion disposed in a flow path of the molten glass between the feeder and the bushing,
the heat generating member and the bushing are disposed apart from each other,
In the forming step, the molten glass is heated by the heat-generating member.