Glass fiber manufacturing apparatus and glass fiber manufacturing method

Abstract

To provide an apparatus and method for manufacturing glass fibers, capable of stably molding a glass filament.SOLUTION: An apparatus 11 for manufacturing glass fibers includes: a feeder 12 circulating molten glass MG; a bushing 13 arranged below the feeder 12 and including a plurality of nozzles N for discharging the molten glass MG; and an exothermic member 14 generating heat due to energization. The exothermic member 14 of the apparatus 11 for manufacturing glass fibers includes an exothermic part 14a arranged in the flow passage of the molten glass MG between the feeder 12 and the bushing 13.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a glass fiber manufacturing apparatus and a glass fiber manufacturing method. [Background technology]

[0002] As described in Patent Document 1, a manufacturing apparatus is used to manufacture glass fibers, which includes a feeder for circulating molten glass and a bushing disposed below the feeder and having a plurality of nozzles for discharging the molten glass. In such a glass fiber manufacturing apparatus, a plurality of glass filaments can be formed by discharging the molten glass from each nozzle of the bushing. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-091954 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned conventional glass fiber manufacturing apparatus, when 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 in the bushing will not be heated sufficiently, or that the temperature of the nozzle of the bushing will rise excessively due to the passage of electricity, resulting in unstable formation of glass filaments.

[0005] An 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. [Means for solving the problem]

[0006] A glass fiber manufacturing apparatus that solves the above problem is an apparatus for manufacturing glass fibers that includes a feeder for circulating molten glass, and a bushing that is arranged below the feeder and has a plurality of nozzles through which the molten glass flows, and is equipped with a heat-generating element that generates heat when electricity is applied, and the heat-generating element has a heat-generating portion that is arranged in the flow path of the molten glass between the feeder and the bushing.

[0007] According to 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 member disposed in the flow path between the feeder and the bushing. This allows molten glass heated to a predetermined temperature to be supplied to the bushing. Therefore, the temperature of the molten glass in the bushing can be stabilized.

[0008] In the glass fiber manufacturing apparatus, the heat-generating portion of the heat-generating member may be made of a plate member arranged to separate a flow path of the molten glass, and the heat-generating portion of the heat-generating member may have a through hole through which the molten glass flows. With this configuration, the contact area between the heat-generating portion of the heat-generating member and the molten glass can be increased, making it possible to heat the molten glass efficiently and improve the temperature uniformity of the molten glass, for example.

[0009] In the 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 makes it possible, for example, to increase the temperature uniformity of the molten glass.

[0010] 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 disposed downstream of the first heat-generating member at a distance from the first heat-generating member. According to 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 allows the outflow of molten glass from the nozzle of the bushing to be stabilized.

[0011] In the above-described glass fiber manufacturing apparatus, the heat-generating member includes a first heat-generating member and a second heat-generating member arranged downstream of the first heat-generating member at a distance 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 made of a plate material arranged to separate a 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.

[0012] This configuration increases the contact area between the heat generating portion of the first heat generating member and the molten glass, and the contact area between the heat generating portion of the second heat generating member and the molten glass, which makes it possible to, for example, heat the molten glass efficiently and increase the temperature uniformity of the molten glass.

[0013] 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.

[0014] In the glass fiber manufacturing apparatus, the heat-generating member and the bushing may be disposed 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.

[0015] 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 portion 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.

[0016] A glass fiber manufacturing method that solves the above-mentioned problems is a glass fiber manufacturing method that includes a molding step of molding glass filaments using a glass fiber manufacturing apparatus, wherein the glass fiber manufacturing apparatus includes a feeder that circulates molten glass, a bushing that is arranged below the feeder and has a plurality of nozzles from which the molten glass flows, and a heat-generating element that generates heat when electricity is applied, the heat-generating element having a heat-generating portion that is arranged in a flow path of the molten glass between the feeder and the bushing, and the molten glass is heated by the heat-generating element in the molding step. [Effects of the Invention]

[0017] According to the present invention, it is possible to stably form glass filaments. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a cross-sectional view showing a glass fiber manufacturing apparatus according to a first embodiment. [Figure 2] FIG. [Figure 3] FIG. [Figure 4] FIG. 4 is a cross-sectional view showing a glass fiber manufacturing apparatus according to a second embodiment. [Figure 5]FIG. [Figure 6] FIG. 10 is a plan view showing a heat generating member according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0019] (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 in the drawings, for the sake of convenience, some of the configuration may be shown exaggerated or simplified. Furthermore, the dimensional ratios of each part may differ from the actual ratios.

[0020] 1 , the glass fiber production apparatus 11 includes a feeder 12 that circulates molten glass MG and a bushing 13 that is arranged below the feeder 12. The glass fiber production apparatus 11 includes a heat-generating member 14 that generates heat when electricity is applied. The glass fiber production apparatus 11 of this embodiment includes an insulating member 15 that is arranged between the heat-generating member 14 and the bushing 13.

[0021] <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 electroformed bricks and dense fired bricks. Examples of electroformed bricks include zirconia-based electroformed bricks, alumina-based electroformed bricks, alumina-zirconia-based electroformed bricks, and alumina-zirconia-silica-based electroformed bricks. Examples of dense fired bricks include dense zircon bricks and dense chrome bricks.

[0022] The feeder 12 includes a flow block 12a that forms a flow path for allowing the molten glass MG to flow down. The flow block 12a is also made of a refractory material. Examples of the glass of 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 / cm. 3 is.

[0023] <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.

[0024] Bushing 13 includes bushing body 13a to which molten glass MG is supplied and base plate 13b provided at the bottom of bushing body 13a. An upper portion of bushing body 13a has a supply port through which molten glass MG is supplied from feeder 12. Bushing 13 is supported by support member S on feeder 12 and the like.

[0025] The glass fiber manufacturing apparatus 11 of this embodiment includes a bushing block 16 disposed 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.

[0026] 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. A plurality of nozzles N are provided in the base plate 13b. 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.

[0027] Examples of materials for the bushing body 13a, the base plate 13b, and the nozzle N include precious metals and precious metal alloys. Precious metals include gold, silver, platinum, palladium, rhodium, iridium, ruthenium, and osmium. From the viewpoint of enhancing durability, the materials for the bushing body 13a, the base plate 13b, and the nozzle N are preferably platinum or a platinum alloy. Examples of platinum alloys include a platinum-rhodium alloy.

[0028] <Heat generating member 14> The heat generating member 14 of the glass fiber manufacturing apparatus 11 has a heat generating portion 14a arranged in a 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.

[0029] Heat generating portion 14a of heat generating member 14 is made of a plate material provided to separate the flow path of molten glass MG. Heat generating portion 14a has through holes TH for circulating molten glass MG. Heat generating portion 14a has multiple through holes TH, and thereby has multiple flow sections with different opening ratios.

[0030] 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 are composed of a pair located on both ends of the heat generating portion 14a. The second circulating portions A2 are composed of a pair adjacent to the inside of each first circulating portion A1. The third circulating portion A3 is positioned between the pair of second circulating portions A2.

[0031] When the aperture ratio of the first flow-through part A1 is RA1 [%], the aperture ratio of the second flow-through part A2 is RA2 [%], and the aperture ratio of the third flow-through part A3 is RA3 [%], the relationship RA1 < RA3 < RA2 may be satisfied. The aperture ratio RA1 of the first flow-through part A1 is, for example, within the range of 1% or more and 20% or less. The aperture ratio RA2 of the second flow-through part A2 is, for example, more than 60% and within the range of 90% or less. The aperture ratio RA3 of the third flow-through part A3 is, for example, more than 20% and within the range of 60% or less.

[0032] Examples of the shape of the through-hole TH of the heat generating part 14a include a circular shape, an elliptical shape, a polygonal shape, a slit shape, etc. The terminal parts 14b are respectively connected to both side parts of the heat generating part 14a. As shown in FIG. 1, the pair of terminal parts 14b are connected to the power supply 17.

[0033] The material of the heat generating member 14 is not particularly limited as long as it can be a resistance heating element, and examples include metals, ceramics, etc. Examples of metals include molybdenum, platinum, platinum alloys, etc. Examples of platinum alloys include, for example, platinum-rhodium alloys.

[0034] <Insulating member 15> As shown in FIGS. 1 and FIG. 3, the insulating member 15 of the glass fiber manufacturing apparatus 11 electrically insulates the heat generating member 14 and the bushing 13. As shown in FIG. 3, the overall shape of the insulating member 15 is, for example, a frame shape and has an insulating member flow path part 15a that penetrates vertically. Examples of the material of the insulating member 15 include refractories, etc. Note that the insulating member 15 may have a single-layer structure or a multi-layer structure.

[0035] <Other configurations> The glass fiber manufacturing apparatus 11 includes an applicator and a gathering shoe, both of which are 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.

[0036] <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 a glass filament 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 a glass filament GF.

[0037] At this time, the glass fiber manufacturing apparatus 11 is equipped with the above-mentioned heat generating member 14. According to 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 heat generating portion 14a of the heat generating member 14 arranged in the flow path between the feeder 12 and the bushing 13. This makes it possible to supply the molten glass MG heated to a predetermined temperature to the bushing 13. Therefore, the outflow of the molten glass MG from the nozzle N of the bushing 13 can be stabilized.

[0038] Furthermore, since the molten glass MG can be heated by the heating portion 14a of the heating member 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 energization in the bushing 13, for example, because it is necessary to prevent an 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, since 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.

[0039] The glass filaments GF obtained in the above-mentioned forming process are bundled to obtain glass strands. The glass strands can be used, for example, as chopped strands cut to a predetermined length. The glass strands can also be used as milled fibers, rovings, yarns, mats, cloths, tapes, braided fabrics, or the like. Applications of the glass strands include, for example, vehicle applications, electronic material applications, building material applications, civil engineering applications, aircraft-related applications, shipbuilding applications, logistics applications, industrial machinery applications, and daily necessities applications.

[0040] <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.

[0041] According to this configuration, as described above, it is possible to stabilize the outflow of the molten glass MG from the nozzle N of the bushing 13. Therefore, it is possible to stably form the glass filament GF.

[0042] (1-2) The heat generating portion 14a of the heat generating member 14 in the glass fiber manufacturing apparatus 11 is made of a plate member provided 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, which makes it possible, for example, to efficiently heat the molten glass MG and improve the temperature uniformity of the molten glass MG.

[0043] (1-3) The heat generating portion 14a of the heat generating member 14 in the glass fiber manufacturing apparatus 11 has a plurality of through holes TH, thereby having a plurality of flow sections with different opening ratios. In this case, it is possible to make the flow of the molten glass MG more complex. This makes it possible, for example, to increase the temperature uniformity of the molten glass MG.

[0044] (1-4) In the glass fiber manufacturing apparatus 11, the heat generating member 14 and the bushing 13 are arranged apart from each other. With this configuration, for example, when both the bushing 13 and the heat generating member 14 are heated, it becomes possible to control the temperatures of both separately.

[0045] (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, the heat-generating portion 14a can be made to generate heat efficiently by increasing the efficiency of current flow to the heat-generating member 14. Also, for example, by suppressing 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.

[0046] (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.

[0047] 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 has 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 a description thereof will be omitted.

[0048] As shown in Fig. 5, second heat generating member 19 has heat generating portion 19a arranged in the flow path of molten glass MG between feeder 12 and bushing 13, and electrical terminal portion 19b connected to heat generating portion 19a. Heat generating portion 19a of second heat generating member 19 is made of a plate material provided to separate the flow path of molten glass MG. Heat generating portion 19a of second heat generating member 19 has through holes TH through which molten glass MG flows. Heat generating portion 19a of second heat generating member 19 has multiple through holes TH, thereby having multiple flow portions with different opening ratios.

[0049] 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 are composed 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 are composed of a pair adjacent to the inside of each first circulating portion B1. The third circulating portion B3 is positioned between the pair of second circulating portions B2.

[0050] Here, the relationship between the circulating portion of the first heat generating member 18 and the circulating portion of the second heat generating member 19 will be described. The first circulating portion B1 of the second heat generating member 19 is arranged downstream of the first circulating portion A1 of the first heat generating member 18. The second circulating portion B2 of the second heat generating member 19 is arranged downstream of the second circulating portion A2 of the first heat generating member 18. The third circulating portion B3 of the second heat generating member 19 is arranged downstream of the third circulating portion A3 of the first heat generating member 18.

[0051] The opening ratio of the first flow-through part B1 in the second heating member 19 is different from the opening ratio of the first flow-through part A1 in the first heating member 18. The opening ratio of the second flow-through part B2 in the second heating member 19 is different from the opening ratio of the second flow-through part A2 in the first heating member 18. The opening ratio of the third flow-through part B3 in the second heating member 19 is different from the opening ratio of the third flow-through part A3 in the first heating member 18. Thus, the flow-through parts of the first heating member 18 and the flow-through parts of the second heating member 19 are arranged so as to have different opening ratios along the flow direction of the molten glass MG.

[0052] Specifically, the opening ratio of the first flow-through part B1 in the second heating member 19 is larger than the opening ratio of the first flow-through part A1 in the first heating member 18. The opening ratio of the second flow-through part B2 in the second heating member 19 is smaller than the opening ratio of the second flow-through part A2 in the first heating member 18. The opening ratio of the third flow-through part B3 in the second heating member 19 is larger than the opening ratio of the third flow-through part A3 in the first heating member 18.

[0053] In the second heating member 19, when the opening ratio of the first flow-through part B1 is RB1 [%], the opening ratio of the second flow-through part B2 is RB2 [%], and the opening ratio of the third flow-through part B3 is RB3 [%], the relationship RB2 < RB1 < RB3 may be satisfied. The opening ratio RB1 of the first flow-through part B1 is, for example, in the range exceeding 20% and not exceeding 60%. The opening ratio RB2 of the second flow-through part B2 is, for example, in the range of 1% or more and 20% or less. The opening ratio RB3 of the third flow-through part B3 is, for example, in the range exceeding 60% and not exceeding 90%.

[0054] The glass fiber manufacturing apparatus 11 includes a bushing block 16 disposed between the first heating member 18 and the second heating member 19. This bushing block 16 electrically insulates between the first heating member 18 and the second heating member 19. An insulating member 15 is disposed between the second heating member 19 and the bushing 13.

[0055] 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.

[0056] In this case, 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 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, the molten glass MG heated to a predetermined temperature can be supplied to the bushing 13. This makes it possible to stabilize the outflow of the molten glass MG from the nozzle N of the bushing 13. Therefore, it becomes possible to stably form the glass filament GF.

[0057] (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 made 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 through which the molten glass MG flows.

[0058] In this case, it is possible to increase the contact area between heat generating portion 18a of first heat generating member 18 and molten glass MG, and the contact area between heat generating portion 19a of second heat generating member 19 and molten glass MG. This makes it possible, for example, to efficiently heat molten glass MG and increase the temperature uniformity of molten glass MG.

[0059] (2-3) First heat generating member 18 and second heat generating member 19 each have a plurality of flow sections with different opening ratios. The flow sections of first heat generating member 18 and the flow sections of second heat generating member 19 are arranged so that they have different opening ratios along the flow direction of molten glass MG. In this case, it is possible to make the flow of molten glass MG more complex. This makes it possible, for example, to further increase the temperature uniformity of molten glass MG.

[0060] (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.

[0061] The heat generating member 14 of the first embodiment can also be changed to a heat generating member 20 shown in Fig. 6. The heat generating member 20 shown in Fig. 6 includes a plate-shaped heat generating portion 20a having no through holes 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 Fig. 6 is a flow path FP for the molten glass MG, and the molten glass MG flows down while going around the heat generating portion 20a.

[0062] At least one of the first heat generating member 18 and the second heat generating member 19 in the second embodiment can 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 can be changed to, for example, a columnar or cylindrical shape.

[0063] The heat generating portion 14a of the heat generating member 14 in the first embodiment has a plurality of 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. 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 in the second embodiment can also be changed to a heat generating portion with a constant opening ratio.

[0064] 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 ratios may be two, or may be four or more.

[0065] In the second embodiment, for example, second heat generating member 19 may be changed to a heat generating member having the same configuration as first heat generating member 18. Furthermore, for example, first heat generating member 18 may be changed to a heat generating member having the same configuration as second heat generating member 19. That is, in the second embodiment, first heat generating member 18 and 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 molten glass MG.

[0066] The glass fiber manufacturing apparatus 11 of the second embodiment may further include a heat-generating member between the first heat-generating member 18 and the second heat-generating member 19, or between the feeder 12 and the first heat-generating member 18. That is, the number of heat-generating members in the glass fiber manufacturing apparatus 11 may be three or more.

[0067] 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.

[0068] In the glass fiber manufacturing apparatus 11 of each embodiment, the insulating member 15 may be omitted. [Explanation of symbols]

[0069] 11...Glass fiber manufacturing equipment 12...Feeder 13...Bushing 14, 20...heat-generating components 14a, 18a, 19a, 20a...heat generating parts 15...Insulating member 18...First heat generating member A1…1st distribution department A2…2nd distribution department A3…Third distribution department 19...Second heat generating member B1…1st distribution department B2…2nd distribution department B3…Third distribution department GF: Glass filament MG: Molten glass N...Nozzle TH…Through hole

Claims

1. 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.

2. 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.

3. The glass fiber manufacturing device according to 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 ratios.

4. 4. The glass fiber manufacturing apparatus according to claim 1, wherein the heat generating member includes a first heat generating member and a second heat generating member arranged downstream of the first heat generating member and spaced apart from the first heat generating member.

5. 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.

6. 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.

7. The glass fiber manufacturing apparatus according to claim 1 , further comprising an insulating member disposed between the heat-generating member and the bushing.

8. 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.

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