CN113998883B - Glass fiber drawing furnace and method for preparing glass fiber by adopting same - Google Patents
Glass fiber drawing furnace and method for preparing glass fiber by adopting same Download PDFInfo
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- CN113998883B CN113998883B CN202111282955.7A CN202111282955A CN113998883B CN 113998883 B CN113998883 B CN 113998883B CN 202111282955 A CN202111282955 A CN 202111282955A CN 113998883 B CN113998883 B CN 113998883B
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/08—Bushings, e.g. construction, bushing reinforcement means; Spinnerettes; Nozzles; Nozzle plates
- C03B37/09—Bushings, e.g. construction, bushing reinforcement means; Spinnerettes; Nozzles; Nozzle plates electrically heated
- C03B37/092—Direct-resistance heating
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
- C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
- C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
- C03B37/0253—Controlling or regulating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
Abstract
The invention provides a glass fiber drawing furnace and a method for preparing glass fiber by adopting the glass fiber drawing furnace, wherein the electric conduction area of an electrode plate is controlled to be more than or equal to 0.5 time of the electric conduction sectional area of glass liquid, the volume of a power line covering the glass liquid is more than or equal to 0.45-0.8 time of the volume of the glass liquid, the distribution uniformity of a temperature field of the glass liquid is improved, the difference between the temperature of a hot spot and the temperature of a liquid surface is less than or equal to 45 ℃, the difference between the temperature of the hot spot and the temperature of a bottom brick is less than or equal to 50 ℃, and the temperature difference of each adjacent liquid surface is less than or equal to 16 ℃, so that the drawing efficiency of the glass fiber is obviously improved, the distribution of the power line is more reasonable, the distribution of the temperature field is more uniform, the power line pushes the electric conductivity of glass ions to rotate and flow, the friction generates heat, the crystallization and phase splitting of the glass at low temperature are inhibited, the melting quality of the glass liquid can be fully improved, and the stability of the drawing operation is favorably improved.
Description
Technical Field
The invention relates to the technical field of glass fiber wire production equipment and technology, in particular to a glass fiber wire drawing furnace and a method for preparing glass fibers by adopting the glass fiber wire drawing furnace.
Background
The glass fiber is an inorganic non-metallic material with excellent performance, has the advantages of good insulativity, strong heat resistance, good corrosion resistance and high mechanical strength, and can be widely used as reinforcing materials, insulating materials, heat-insulating materials and other fields. The glass fiber needs to be melted and drawn in the production process.
The patent CN87202593U provides an offset long wire drawing furnace (crucible) which is beneficial to drawing of medium-alkali and alkali-free glass fibers and common glass fibers, and the invention has the problems that the temperature of glass liquid at four corners of the wire drawing furnace (crucible) is low, the forming of the fibers is affected by uneven material melting, and the production of fine branch fibers (the diameter of a precursor fiber is 5 microns or less) cannot be well realized.
CN101492245B provides a crucible for producing superfine continuous glass fiber, two plate-shaped electric electrodes are arranged in the crucible, and the relationship of the position and the distance of the electrodes in the crucible and the multiple of the length of the crucible is specified; a liquid taking groove is arranged in the crucible liquid flow hole, and the size and the installation position of the liquid taking cylinder are defined. Compared with the patent of CN87202593U, the technology of the patent can meet the production requirement of continuous fiber precursor with the diameter less than 5 microns. But the electrode which is more than 50mm away from the bottom brick and is obliquely arranged with the bottom brick is adopted for heating, the glass liquid at four corners also has low temperature, and a platinum-rhodium alloy liquid taking groove is added, so that the production cost and the production operation difficulty are increased, and the production efficiency is low.
Further, although the above drawing furnace can satisfy drawing and forming requirements of short glass fibers such as medium alkali and alkali-free glass fibers, the quality of the obtained short glass fibers is poor due to large temperature difference of the four-corner glass melt and non-uniform temperature field, and phase separation and crystallization are likely to occur, and it is difficult for these drawing furnaces to satisfy forming production of long glass fibers.
Disclosure of Invention
Therefore, the invention aims to overcome the defect of uneven temperature field of the glass fiber drawing furnace in the prior art during fiber drawing, and provides the glass fiber drawing furnace and the method for preparing glass fiber by using the glass fiber drawing furnace.
The invention provides a glass fiber drawing furnace, which comprises a furnace body and an electrode plate, wherein a hearth for containing molten glass is arranged in the furnace body, the volume of the molten glass covered by power lines is more than or equal to 0.45-0.8 time of the volume of the molten glass, and the conductive area of the electrode plate is more than or equal to 0.5 time of the conductive sectional area of the molten glass.
Wherein the volume of the electric field lines covering the molten glass is the length of the electrode plates in the molten glass multiplied by the relative distance between the two electrode plates multiplied by the depth of the electric field lines covering the molten glass (wherein, the depth of the electric field lines covering the molten glass = the height of the electrode plates). The volume of the molten glass is the depth of the molten glass multiplied by the volume of the molten glass multiplied by the width of the furnace. The conductive area of the electrode plate is the length of the electrode plate in the molten glass multiplied by the height of the electrode plate. The conductive sectional area of the molten glass is the width of the hearth multiplied by the depth of the molten glass.
Furthermore, the ratio of the volume of the glass liquid covered by the electric line to the volume of the glass liquid is 0.5-0.8 times, and the conductive area of the electrode plate is 0.67-0.75 times of the conductive sectional area of the glass liquid.
Further, the depth of the molten glass is 240mm or more, preferably 240 to 300mm.
Furthermore, the distance between the bottom end of the electrode plate and the bottom brick of the furnace body is 10-30mm.
Further, the ratio of the height of the electrode plate to the depth of the molten glass is 0.54-0.9.
Further, the ratio of the length of the electrode plate in the molten glass to the width of the hearth is more than or equal to 0.9. Preferably 1.
Furthermore, both ends of the electrode plate extend out of the side wall of the furnace body.
Further, the electrode plates are vertically distributed with the furnace body bottom brick.
The furnace body is enclosed by a side wall, a bottom brick and a top brick.
Further, the side wall, the bottom brick and the top brick of the furnace body are independently selected from at least one of corundum bricks and zirconium bricks, and dense zirconium bricks or high-zirconium bricks are preferred.
Further, two electrode plates are provided.
Furthermore, flanges are arranged at two ends of the electrode plate in an extending manner towards the other electrode plate.
The two ends of the electrode plate in the length direction or the two ends of the electrode plate in the height direction can be adopted.
Furthermore, a liquid flowing hole is arranged at the offset position of the bottom of the furnace body. The liquid flowing hole is arranged at a position 1/2.5-1/4 of the distance from the left end or the right end of the hearth.
Further, the length of the electrode plate in the molten glass is 1.26-1.35 times of the length of the liquid flow hole.
Further, the vertical distance between the bottom end of the electrode plate and the bottom brick of the furnace body is 10-30mm.
Furthermore, a ball adding hole and a temperature measuring hole are formed in the top of the wire drawing furnace.
The invention also provides a preparation method of the glass fiber, which is prepared by taking glass material as a raw material and adopting any one of the glass fiber drawing furnaces for drawing. Specifically, the method comprises the steps of electrifying and heating the glass material, and drawing at the hot spot temperature of more than 1300 ℃. The glass material is melted to form glass melt in the process of electrifying and heating, and the hot spot temperature is preferably higher than 1320 ℃ for wire drawing.
Further, the glass frit is selected from at least one of high silica glass, D glass and alkali-free glass.
The technical scheme of the invention has the following advantages:
1. according to the glass fiber drawing furnace provided by the invention, the electric conduction area of the electrode plate is controlled to be larger than or equal to 0.5 time of the electric conduction sectional area of the glass liquid, the volume of the electric power line covering the glass liquid is larger than or equal to 0.45-0.8 time of the volume of the glass liquid, the distribution uniformity of the temperature field of the glass liquid is improved, the difference between the temperature of a hot spot and the temperature of the liquid surface is smaller than or equal to 45 ℃, the difference between the temperature of the hot spot and the temperature of a bottom brick is smaller than or equal to 50 ℃, and the temperature difference of each adjacent liquid surface is smaller than or equal to 16 ℃, so that the distribution of the electric power line and the temperature field is more reasonable, the electric power line pushes the electric conductivity of glass ions to rotate and flow, and the friction generates heat, the crystallization and the phase splitting of the glass at a low temperature are inhibited, the drawing efficiency of long-material glass fibers is obviously improved, the melting quality of the glass liquid can be fully improved, and the drawing stability of the operation is favorably improved.
2. In a preferred embodiment, the electric conduction area of the electrode plate is controlled to be 0.67-0.75 time of the electric conduction sectional area of the molten glass, and the ratio of the volume of the electric line covering the molten glass to the volume of the molten glass is 0.45-0.8 time, so that the distribution uniformity of the temperature field of the molten glass is greatly improved, and the temperature difference between a heat point and the bottom and the liquid level can be further reduced.
3. The glass fiber drawing furnace provided by the invention can further reduce the temperature difference between a hot spot and the bottom and the liquid level by controlling the depth of the glass liquid to be more than or equal to 240mm, preferably 240-300mm.
4. The glass fiber drawing furnace provided by the invention is not only suitable for producing short glass fibers such as alkali-free glass, but also suitable for producing long glass fiber balls such as high silica glass and D glass, wherein the high silica glass refers to SiO 2 The content is not less than 55%, and D glass has a dielectric constant of not more than 5.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic structural view of a specific example of a drawing furnace in example 1 of the present invention;
FIG. 2 is a schematic structural view of a specific example of a drawing furnace in example 1 of the present invention;
FIG. 3 is a schematic structural view showing a specific example of an electrode plate in example 1 of the present invention;
reference numerals are as follows:
1. a furnace body; 2. a hearth; 3. an electrode plate; 4. a liquid flowing hole; 5. adding a ball hole; 6. a temperature measuring hole.
Detailed Description
The following examples are provided to further understand the present invention, not to limit the scope of the present invention, but to provide the best mode, not to limit the content and the protection scope of the present invention, and any product similar or similar to the present invention, which is obtained by combining the present invention with other prior art features, falls within the protection scope of the present invention.
The examples do not show the specific experimental steps or conditions, and can be performed according to the conventional experimental steps described in the literature in the field. The reagents or instruments used are not indicated by manufacturers, and are all conventional reagent products which can be obtained commercially. The alkali-free glass ball adopted by the invention is an alkali-free No. 1 component, and meets the relevant regulation of standard JC 935-2004.
Example 1
The embodiment provides a wire drawing furnace, as shown in fig. 1-3, a furnace chamber 2 for containing molten glass is arranged in a furnace body 1, a ball adding hole 5 and a temperature measuring hole 6 are arranged at the top of the furnace body, and a throat 4 is arranged at the bottom of the furnace body. The side wall, the bottom brick and the top brick of the furnace body can adopt the existing brick bodies, such as but not limited to at least one of corundum brick and zirconium brick, and preferably compact zirconium brick or high zirconium brick. Two electrode plates 3 are arranged in the hearth, the electrode plates can adopt conventional electrode plates such as platinum electrodes, and the two electrode plates have the same size. The two electrode plates are arranged in parallel along the direction vertical to the wire drawing furnace bottom brick.
The depth of the molten glass in the hearth 2 is recorded as h, the length of the hearth is recorded as a, the width of the hearth is recorded as b, the volume of the molten glass in the hearth is recorded as abh, and the conductive sectional area of the molten glass is the product of the width of the hearth and the depth of the molten glass and is recorded as bh. The length of the electrode plate in the glass liquid is called as effective length and is marked as y, and the height of the electrode plate is marked as z. The conductive area of an electrode plate is the effective length of the electrode plate multiplied by the height of the electrode plate, and is denoted yz. The depth of the electric line covered with the glass liquid is the height z of the electrode plate. The relative distance between the two electrode plates is recorded as x, and the volume of the electric line covered by the glass liquid is the effective length of the electrode plates multiplied by the relative distance between the two electrode plates multiplied by the depth of the electric line covered by the glass liquid and is recorded as xyz.
The invention controls the electric power line to cover the volume of the glass liquid to be more than or equal to 0.45-0.8 times (marked as xyz/abh) of the volume of the glass liquid. The conductive area of the electrode plate is more than or equal to 0.5 time (marked as yz/bh) of the conductive sectional area of the glass metal, and the distribution uniformity of the glass metal temperature field is improved. In some preferred embodiments, the ratio of the volume of the glass metal covered by the electric lines of force to the volume of the glass metal is controlled to be 0.5 to 0.8 times, and the conductive area of the electrode plate is controlled to be 0.67 to 0.75 times the conductive cross-sectional area of the glass metal.
In order to further improve the uniformity of temperature field control, the depth of the glass liquid is controlled to be more than or equal to 240mm, and the glass liquid is preferably controlled to be 240-300mm. And/or controlling the ratio of the height of the electrode plate to the depth of the molten glass to be 0.54-0.9. And/or controlling the ratio of the length of the electrode plate in the molten glass to the width of the hearth to be more than or equal to 0.9.
Wherein the width/thickness of the electrode plate is 0.5-3mm, preferably 1mm. The distance between the bottom end of the electrode plate and the bottom plate of the wire drawing furnace is 10-30mm, preferably 30mm; the distance between the top end of the electrode plate and the liquid level of the glass liquid is 10-30mm, preferably 30mm.
In order to further improve the uniformity of the temperature, a throat is arranged at the bottom of the furnace body in an offset way, the throat is not positioned in the middle of the furnace body, and the throat is arranged in an offset way, for example, at a position 1/2.5-1/4 away from the left end or the right end of a hearth. The fluctuation of the temperature field of the throat can be reduced during feeding. The cross section of the liquid flow hole is square, and in order to further improve the temperature uniformity of four corners, the effective length of the control electrode plate is 1.26-1.35 times of the length of the liquid flow hole.
Both ends of the electrode plate can extend out of the side wall of the furnace body. Two convex edges are arranged at two ends of the electrode plate in an extending way towards the other electrode plate, the convex edges can be arranged at two ends of the electrode plate in the length direction or two ends of the electrode plate in the height direction, the convex edges are positioned in the furnace body, the cross section can be rectangular or square, the length of the convex edges is 10-40mm, and the width of the convex edges is 0.5-6mm. The technology can further improve the temperature and the uniformity of four corners, improve the temperature uniformity of glass liquid flowing into the bushing plate, and improve the wire drawing efficiency and the quality of precursor.
In the present invention, the glass liquid can be obtained by melting conventional glass frits, such as but not limited to alkali-free glass spheres, high silica glass spheres, D glass spheres, and the like.
The main size parameters of the wire drawing furnace are shown in the following table 1, and in addition, the distance between the bottom end of the electrode plate and the bottom plate of the wire drawing furnace and the distance between the top end of the electrode plate and the liquid level of the glass liquid are both 30mm. The width/thickness of the electrode plate is 1mm, the length of the throat is 230mm, and the effective length of the electrode plate is 1.3 times of the length of the throat.
Table 1 example 1 dimensions of the drawing furnace
The electric field lines cover the volume of the molten glass to be 0.63 times the volume of the molten glass (expressed as xyz/abh). The conductive area of the electrode plate is 0.75 times the conductive cross-sectional area of the molten glass (denoted as yz/bh).
The embodiment also provides a preparation method of the glass fiber, which comprises the following steps: taking the alkali-free glass spheres, putting the alkali-free glass spheres into each drawing furnace according to the specification of the depth of the glass liquid in the embodiment, electrifying and heating the drawing furnaces, and drawing the glass fibers at the hot spot temperature of 1340 ℃ to obtain the glass fibers.
Example 2
This example provides a drawing furnace, which differs from example 1 only in the parameters of the drawing furnace, which are shown in table 2.
Table 2 example 2 dimensions of the drawing furnace
The electric line of force covers 0.45 times the volume of the molten glass (denoted as xyz/abh). The conductive area of the electrode plate is 0.54 times the conductive cross-sectional area of the molten glass (denoted as yz/bh).
The embodiment also provides a preparation method of the glass fiber, which comprises the following steps: taking the alkali-free glass spheres, putting the alkali-free glass spheres into each drawing furnace according to the specification of the depth of the glass liquid in the embodiment, electrifying and heating the drawing furnaces, and drawing the glass fibers at the hot spot temperature of 1340 ℃ to obtain the glass fibers.
Example 3
This example provides a drawing furnace, differing from example 1 only in that the length of the throat is 180mm and the length of the electrode is 1.7 times the length of the throat.
The embodiment also provides a preparation method of the glass fiber, which comprises the following steps: taking the alkali-free glass spheres, putting the alkali-free glass spheres into each drawing furnace according to the specification of the depth of the glass liquid in the embodiment, electrifying and heating the drawing furnaces, and drawing at a hot spot temperature of 1330 ℃ to obtain the glass fibers.
Comparative example 1
This comparative example provides a drawing furnace which is different from example 1 in (1) the parameters of the drawing furnace are shown in table 3.
Table 3 dimensions of the drawing furnace of comparative example 1
The electric field lines cover 0.28 times the volume of the molten glass (denoted as xyz/abh). The conductive area of the electrode plate is 0.39 times the conductive cross-sectional area of the molten glass (denoted as yz/bh).
The comparative example also provides a method of making a glass fiber, comprising the steps of: taking the alkali-free glass spheres, putting the alkali-free glass spheres into each drawing furnace according to the specification of the depth of the glass liquid in the embodiment, electrifying and heating the drawing furnaces, and drawing the glass fibers at a hot spot temperature of 1310 ℃ to obtain the glass fibers.
Comparative example 2
This comparative example provides a drawing furnace which differs from example 1 in (1) the parameters of the drawing furnace, which are shown in table 4.
Table 4 dimensions of comparative example 2 wire drawing furnace
The electric field lines cover the volume of the molten glass to be 0.29 times the volume of the molten glass (expressed as xyz/abh). The conductive area of the electrode plate is 0.80 times of the conductive sectional area of the molten glass (recorded as yz/bh).
The comparative example also provides a method of making a glass fiber, comprising the steps of: taking the alkali-free glass spheres, putting the alkali-free glass spheres into each wire drawing furnace according to the specification of the depth of the glass liquid in the embodiment, electrifying and heating the glass spheres, and drawing the glass spheres at the hot spot temperature of 1320 ℃ to obtain the glass fibers.
Experimental example 1
Before starting drawing in each of examples and comparative examples, the temperature field distribution (or hot spot temperature) of the molten glass was measured, and for examples 1 to 3, temperatures at different depths from the surface of the molten glass, including the surface temperature (0 mm), were measured using a double platinum rhodium thermocouple with the surface of the molten glass (0 mm) as a reference point and the depth of the night (20 mm) as a gradient, and for comparative examples 1 to 2, temperatures at 20mm, 40mm, 60mm, 80mm, 100mm, 120mm, 140mm, 160mm, and 180mm, 200mm, 220mm, and 240mm were measured, and for comparative examples 1 to 2, temperatures at 0mm, and temperatures at 20mm, 40mm, 60mm, 80mm, 100mm, 120mm, 140mm, and 150mm were measured. The hotspot temperature of the glass fiber preparation methods of the examples and comparative examples is the highest temperature of different molten glass depths measured according to the above method, and the results are shown in the following table.
TABLE 5 temperature field distribution results table
Compared with comparative examples 1-2, the temperature difference between the hot spot temperature of the wire drawing furnace and the temperature difference between the bottom and the liquid level provided by examples 1-3 of the invention is obviously reduced, the temperature difference between the liquid levels at different depths is obviously reduced, and the invention can effectively improve the uniformity of the temperature field in the liquid depth direction. In particular, the drawing furnace of example 1 has a liquid depth temperature difference of 3 to 13 ℃ per 20mm, a hot spot temperature difference of 45 ℃ from the bottom, and a liquid level temperature difference of 35 ℃. The temperature difference of the liquid depth of each 20mm of the common wire drawing furnace of the comparative examples 1 and 2 is 10-23 ℃, and the difference between the hot spot temperature and the temperature of the bottom and the liquid level is more than 60 ℃. Compared with a comparative example, the temperature difference between the hot spot and the bottom and the liquid level is respectively reduced by 25% and 42% in the embodiment 1, and the reduction of the temperature difference in the field of the platinum-substituted crucible wire drawing furnace can obviously improve the stability of wire drawing operation, so that the obvious economic benefit is realized, and the technology in the field is obviously improved.
Experimental example 2
Before the wire drawing of each example and comparative example is started, the temperature of the bottom brick of the hearth of each example and comparative example is measured by using a double platinum rhodium thermocouple, and the result is shown in the following table, wherein the middle temperature is the central temperature of the throat, and the corners 1 to 4 are the temperatures at the four corners of the bottom brick and about 20mm away from the side wall.
TABLE 6 temperature field distribution results table
Compared with comparative examples 1-2, the temperature difference between the intermediate temperature of the bottom brick of the wire-drawing furnace provided by examples 1-3 of the invention and the temperature difference between the angle 1 and the angle 4 is obviously reduced, which shows that the temperature field uniformity of the wire-drawing furnace is better.
Experimental example 3
The drawing furnace provided in each of the examples and comparative examples was tested for machine-to-machine yield (kg), full package percentage (%), strand yield (%), strand passage (%), drawing furnace glass melt hot spot temperature (. Degree. C.), glass melt four corner average temperature (. Degree. C.), and mechanical strength of the glass fibers produced. The machine-to-machine output of the wire drawing furnace is the output of a single wire drawing furnace for producing the precursor in 24 hours, the full bobbin rate is the number of full bobbins/total number of full bobbins produced in 12 hours per machine, the precursor yield = the total amount of the precursor/the amount of alkali-free glass balls produced, the precursor yield = the total amount of the qualified precursor/the total amount of the precursor produced, the precursor passing rate = the precursor yield multiplied by the precursor yield, the production efficiency is represented, and the mechanical strength is tested by a tensile strength machine. The results are shown in the following table.
TABLE 7 Performance results Table
Compared with comparative examples 1-2, the hot spot temperature of the wire drawing furnace provided by examples 1-3 of the invention can be integrally increased, the average temperature of four corners of the molten glass is obviously increased, the yield, the full cylinder rate, the qualification rate and the precursor passing rate are obviously increased, particularly, the wire drawing furnace adopting example 1 can integrally increase the hot spot temperature of the molten glass by 15-30 ℃ compared with the original common wire drawing furnace, meanwhile, the temperature drop of the molten glass is reduced by more than 15 ℃ compared with the original wire drawing furnace, the average temperature of four corners of the molten glass is increased by more than 40 ℃, the secondary bubble discharge of the molten glass is facilitated, the temperature field distribution is more uniform, and the wire drawing forming is facilitated. Greatly improves the yield of the raw yarn machine shift, the full bobbin rate, the finished product rate of the raw yarn, the qualification rate of the raw yarn and the passing rate of the raw yarn, thereby improving the production efficiency of the raw material, saving the glass raw material and reducing the emission of solid waste. And the strength, the performance and the quality of the protofilament are improved.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (16)
1. The glass fiber drawing furnace is characterized by comprising a furnace body and an electrode plate, wherein a hearth for containing molten glass is arranged in the furnace body, the volume of the molten glass covered by power lines is greater than or equal to 0.45-0.8 time of the volume of the molten glass, and the conductive area of the electrode plate is greater than or equal to 0.5 time of the conductive sectional area of the molten glass.
2. The glass fiber drawing furnace according to claim 1, wherein the ratio of the volume of the electric field line covering glass melt to the volume of the glass melt is 0.5 to 0.8 times, and the conductive area of the electrode plate is 0.67 to 0.75 times the conductive cross-sectional area of the glass melt.
3. The glass fiber drawing furnace according to claim 1, wherein the depth of the molten glass is 240mm or more.
4. The glass fiber drawing furnace according to claim 3, wherein the molten glass has a depth of 240 to 300mm.
5. The glass fiber drawing furnace according to any one of claims 1 to 4, wherein the ratio of the height of the electrode plate to the depth of the molten glass is 0.54 to 0.9; and/or the ratio of the length of the electrode plate in the molten glass to the width of the hearth is more than or equal to 0.9.
6. The glass fiber drawing furnace according to any one of claims 1 to 4, wherein both ends of the electrode plate protrude from the side wall of the furnace body.
7. The glass fiber drawing furnace according to any one of claims 1 to 4, wherein the electrode plates are arranged perpendicular to the bottom bricks of the furnace body.
8. The glass fiber drawing furnace according to any one of claims 1 to 4, wherein two electrode plates are provided.
9. The glass fiber drawing furnace according to claim 8, wherein both ends of the electrode plate are provided with flanges extending in a direction toward the other electrode plate.
10. The glass fiber drawing furnace according to any one of claims 1 to 4, wherein the furnace body comprises side walls, bottom bricks and top bricks, and the side walls, the bottom bricks or the top bricks are independently selected from at least one of corundum bricks and zirconium bricks.
11. The glass fiber drawing furnace of claim 10, wherein the side walls, bottom bricks, or top bricks are independently selected from dense zirconium bricks or high zirconium bricks.
12. The glass fiber drawing furnace according to any one of claims 1 to 4, wherein a throat is provided at a bottom offset of the furnace body.
13. The glass fiber drawing furnace according to claim 12, wherein the length of the electrode plate in the molten glass is 1.26 to 1.35 times the length of the throat.
14. The glass fiber drawing furnace according to any one of claims 1 to 4, wherein the vertical distance between the bottom end of the electrode plate and the bottom brick of the furnace body is 10 to 30mm.
15. A method for preparing glass fiber by using the glass fiber drawing furnace as claimed in any one of claims 1 to 14, wherein the glass fiber is drawn by using a glass fiber drawing furnace by using glass frit as a raw material.
16. The method for preparing glass fiber by the glass fiber drawing furnace according to claim 15, wherein the glass material is at least one of alkali-free glass, high silica glass and D glass.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1985001497A1 (en) * | 1983-09-29 | 1985-04-11 | Owens-Corning Fiberglas Corporation | Electrical melting of solidified glass in melting units |
| CN87202593U (en) * | 1987-03-03 | 1988-01-06 | 国家建筑材料工业局南京玻璃纤维研究设计院 | Long flowing distance glass fiber wire drawing platinum replacing stove |
| CN2059438U (en) * | 1989-08-11 | 1990-07-18 | 国家建筑材料工业局南京玻璃纤维研究设计院 | Glass fiber instead of pt stove with two pairs of electrode arranged vertically |
| US6125658A (en) * | 1997-07-22 | 2000-10-03 | Isover Saint-Gobain | Glass furnace and installation comprising same |
| CN101456664A (en) * | 2008-12-26 | 2009-06-17 | 中材科技股份有限公司 | Special fiber glass melting method and its special electric melting furnace |
| CN104402210A (en) * | 2014-10-16 | 2015-03-11 | 宿迁市天彩玻璃纤维有限公司 | Novel glass fiber wiredrawing furnace |
| CN212334989U (en) * | 2020-04-10 | 2021-01-12 | 彩虹集团有限公司 | Cover plate glass kiln |
-
2021
- 2021-11-01 CN CN202111282955.7A patent/CN113998883B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1985001497A1 (en) * | 1983-09-29 | 1985-04-11 | Owens-Corning Fiberglas Corporation | Electrical melting of solidified glass in melting units |
| CN87202593U (en) * | 1987-03-03 | 1988-01-06 | 国家建筑材料工业局南京玻璃纤维研究设计院 | Long flowing distance glass fiber wire drawing platinum replacing stove |
| CN2059438U (en) * | 1989-08-11 | 1990-07-18 | 国家建筑材料工业局南京玻璃纤维研究设计院 | Glass fiber instead of pt stove with two pairs of electrode arranged vertically |
| US6125658A (en) * | 1997-07-22 | 2000-10-03 | Isover Saint-Gobain | Glass furnace and installation comprising same |
| CN101456664A (en) * | 2008-12-26 | 2009-06-17 | 中材科技股份有限公司 | Special fiber glass melting method and its special electric melting furnace |
| CN104402210A (en) * | 2014-10-16 | 2015-03-11 | 宿迁市天彩玻璃纤维有限公司 | Novel glass fiber wiredrawing furnace |
| CN212334989U (en) * | 2020-04-10 | 2021-01-12 | 彩虹集团有限公司 | Cover plate glass kiln |
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| Publication number | Publication date |
|---|---|
| CN113998883A (en) | 2022-02-01 |
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