CN115626761B - Method for preventing crystallization on surface of medium borosilicate glass tube - Google Patents
Method for preventing crystallization on surface of medium borosilicate glass tube Download PDFInfo
- Publication number
- CN115626761B CN115626761B CN202211344890.9A CN202211344890A CN115626761B CN 115626761 B CN115626761 B CN 115626761B CN 202211344890 A CN202211344890 A CN 202211344890A CN 115626761 B CN115626761 B CN 115626761B
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- China
- Prior art keywords
- air
- cooling cover
- temperature
- glass tube
- glass
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- 238000002425 crystallisation Methods 0.000 title claims abstract description 32
- 230000008025 crystallization Effects 0.000 title claims abstract description 32
- 239000005388 borosilicate glass Substances 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000011521 glass Substances 0.000 claims abstract description 53
- 238000001816 cooling Methods 0.000 claims abstract description 41
- 239000000463 material Substances 0.000 claims abstract description 38
- 239000007788 liquid Substances 0.000 claims abstract description 33
- 238000010438 heat treatment Methods 0.000 claims description 10
- 230000000694 effects Effects 0.000 claims description 4
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 4
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 238000005192 partition Methods 0.000 claims description 3
- 230000001174 ascending effect Effects 0.000 claims description 2
- 238000004321 preservation Methods 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000013078 crystal Substances 0.000 description 10
- 239000000126 substance Substances 0.000 description 10
- 238000010899 nucleation Methods 0.000 description 4
- 230000006911 nucleation Effects 0.000 description 4
- 238000007664 blowing Methods 0.000 description 3
- 239000012071 phase Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000006060 molten glass Substances 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 150000002222 fluorine compounds Chemical class 0.000 description 1
- 239000000156 glass melt Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910001635 magnesium fluoride Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000005191 phase separation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
- C03B5/23—Cooling the molten glass
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B7/00—Distributors for the molten glass; Means for taking-off charges of molten glass; Producing the gob, e.g. controlling the gob shape, weight or delivery tact
- C03B7/02—Forehearths, i.e. feeder channels
- C03B7/06—Means for thermal conditioning or controlling the temperature of the glass
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B7/00—Distributors for the molten glass; Means for taking-off charges of molten glass; Producing the gob, e.g. controlling the gob shape, weight or delivery tact
- C03B7/08—Feeder spouts, e.g. gob feeders
- C03B7/094—Means for heating, cooling or insulation
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
Abstract
A method for preventing crystallization on the surface of a medium borosilicate glass tube is characterized in that an air cooling cover is arranged below a material basin, in the production process, through controlling the temperature of glass liquid in the material channel and glass liquid near an end, crystallization phenomenon is prevented, meanwhile, the air cooling cover does not generate unstable air flow and air pressure, the forming of the glass tube is not influenced, and the yield of the glass tube is improved.
Description
Technical Field
The invention relates to the technical field of glass tube surface treatment, in particular to a method for preventing crystallization on the surface of a borosilicate glass tube.
Background
The neutral borosilicate glass tube has various appearance defects such as gas lines, black spots, stones, stupelines, crystallization and the like, which are important factors affecting the quality of the neutral borosilicate glass tube and are difficult to solve in the tube bottle glass industry. The glass tube crystallization is a crystal nucleus substance with visible appearance surface, the crystal nucleus substance has unequal sizes and surface bulges, the crystal nucleus substance is clearly visible on the surface of a finished glass tube product, and the crystal nucleus substance has a circular oval shape and a discontinuous series shape.
The crystal nucleus substance is separated out from glass liquid, and is a glass liquid phase transition phenomenon, namely, two liquid phases which are not dissolved or partially dissolved in a certain temperature range in a glass kiln. The phase separation of glass can promote glass crystallization, and the crystallization substances generally comprise metal salts, oxides and fluorides in the glass component, and the metal salts generally comprise: au\ag\cu\pt, etc.; the oxides generally include: tiθ2\p2o2\zro2; the fluoride species generally include: caF2\MgF2.
The phase transition from the liquid state of glass to crystallization must have two conditions, namely, nucleation and nucleation growth. The nucleation rate and the growth rate of the crystals are different from each other at different temperatures of the molten glass. When the temperature of the glass liquid is higher than the liquidus line, the nucleation rate and the growth rate of the crystal nucleus of the glass melt are equal to zero, and no crystallization occurs at the temperature. When the temperature of the glass liquid gradually decreases to a certain temperature inherent to each chemical composition, tiny crystal nuclei are first precipitated in the glass liquid, and the temperature at this time is generally called the upper limit temperature of glass crystallization; with the increasing of melt viscosity with the decreasing of temperature, the number of new crystal nuclei is gradually decreased, and when the temperature is lower, the atoms of the substance lose the ability to move with each other because the viscosity of the glass liquid is great, so that no new crystal nuclei are formed. Therefore, how to prevent the phase change of chemical components in the glass liquid by controlling the temperature of the glass liquid and finally avoid the generation of crystallization on the surface of the borosilicate glass tube becomes a problem to be solved in the industry.
Disclosure of Invention
The invention aims to provide a method for preventing crystallization on the surface of a medium borosilicate glass tube, which can prevent phase transformation of chemical components in glass liquid by controlling the temperature of the glass liquid, and finally prevent crystallization on the surface of the medium borosilicate glass tube, thereby improving the yield of products.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a method for preventing crystallization on the surface of a medium borosilicate glass tube comprises the following steps: the glass liquid fired by the glass kiln enters a material channel, a thermocouple measures the temperature of the glass liquid, and a heating rod and a silicon carbide rod control the temperature of the glass liquid in the material channel and a material basin to 1345-1355 ℃ according to the temperature signal of the thermocouple; the temperature of the glass liquid is always controlled to be 1345-1355 ℃ under the action of an intermediate frequency heating device at the position of the material bowl; an air cooling cover is arranged at the periphery of the material bowl and the end head; air is blown into the spiral air duct of the air cooling cover, the air inlet of the air cooling cover is high-pressure air, the temperature is stably controlled at 19-21 ℃, and the temperature of the air outlet of the air cooling cover is controlled at 115-125 ℃; the temperature of the glass liquid at the end is controlled to be 1245-1255 ℃ by the air cooling effect of the air cooling cover.
According to the method for preventing crystallization on the surface of the medium borosilicate glass tube, the air-cooling cover is cylindrical and is divided into the inner layer and the outer layer, the spiral partition plate with spiral ascending is arranged between the inner layer and the outer layer of the air-cooling cover, a spiral air duct is formed between the inner layer and the outer layer of the air-cooling cover, the upper end and the lower end of the inner layer and the outer layer of the air-cooling cover are welded in a sealing mode, the lower end of the air-cooling cover is open, and the upper end of the air-cooling cover is sealed; the air outlet is arranged at the upper end of the side wall of the air cooling cover, the air inlet is arranged at the lower end of the side wall of the air cooling cover, and the air outlet is communicated with the atmosphere.
According to the method for preventing the crystallization on the surface of the medium borosilicate glass tube, the spiral air duct is arranged to be 7-8 circles.
According to the method for preventing crystallization on the surface of the borosilicate glass tube, the periphery of the material channel and the periphery of the material basin are provided with the heat insulation layers.
Advantageous effects
The invention has the following advantages:
according to the method for preventing crystallization on the surface of the medium borosilicate glass tube, the air cooling cover is arranged below the material basin, in the production process, through controlling the temperature of glass liquid in the material channel and glass liquid near the end, crystallization phenomenon is prevented, meanwhile, unstable air flow and air pressure are not generated by the air cooling cover, the forming of the glass tube is not influenced, the tube breakage phenomenon is avoided, and the yield of the glass tube is improved.
Drawings
FIG. 1 is a schematic illustration of the present invention;
FIG. 2 is a schematic diagram of an air-cooled cooling enclosure of the present invention;
the reference numerals in the drawings are respectively as follows: 1. the glass tube furnace comprises a material channel, 2, molten glass, 3, a bottom discharge hole, 4, a heating rod, 5, an insulating layer, 6, a thermocouple, 7, an air blowing rod, 8, a silicon carbide rod, 9, an overflow material hole, 10, a material basin, 11, an air cooling cover, 12, an intermediate frequency heating device, 13, a material bowl, 14, an end, 15, a spiral air channel, 16, a spiral partition plate, 17, an air outlet, 18, an air inlet, 19 and a glass tube.
Detailed Description
The invention is further described below with reference to the drawings and examples.
The method for avoiding crystallization on the surface of the medium borosilicate glass tube comprises the following steps: the glass liquid 2 fired by the glass kiln enters the material channel 1, impurities are discharged at the bottom discharge hole 3, impurities floating above the glass liquid are discharged at the overflow material hole 9, clean glass liquid is converged at the material basin 10 and flows into the material bowl 13, and the end 14 is blown by the blowing rod 7 to prepare a finished product of the medium borosilicate glass tube 19, and finally the finished product is conveyed to the next process by the mechanical conveying device.
According to the method for preventing crystallization in the middle borosilicate glass tube forming, the material basin is arranged at the right end of the material channel; the bowl is arranged below the bowl; the end head is arranged below the material bowl; the blowing rod is arranged right above the material bowl; the upper part of the material channel is provided with a thermocouple 6, and the bottom of the material channel is provided with a heating rod 4; a silicon carbide rod 8 is arranged above the material basin; an intermediate frequency heating device 12 is arranged at the end, and an air cooling cover 11 is arranged at the periphery of the end.
According to the method for preventing crystallization in the middle borosilicate glass tube forming, the air cooling cover is cylindrical and is divided into an inner layer and an outer layer, a spiral air duct 15 is arranged between the inner layer and the outer layer, the upper end and the lower end of the air cooling cover are sealed and welded, the lower end of the air cooling cover is open, and the upper end of the air cooling cover is sealed.
According to the method for preventing crystallization in the middle borosilicate glass tube forming, the peripheries of the material channel and the material basin are provided with the heat preservation layer 5.
The method for preventing crystallization of the medium borosilicate glass tube molding of the invention is characterized in that during production, a heating rod is used to control the temperature of glass liquid in a material channel to 1345-1355 ℃, when the temperature is increased to the temperature, the condition of generating glass crystallization nucleus is not caused in the material channel, and crystallization is not caused without the generating condition; the high-temperature glass liquid flows into the material bowl 13, and at the moment, the temperature of the glass liquid is reduced under the action of the peripheral air cooling cover, so that the temperature of the glass liquid is always controlled to be 1345-1355 ℃ by using the intermediate-frequency heating device 12; finally, the temperature of the glass liquid at the end 14 is reduced to 1245-1255 ℃ by the air cooling effect of the air cooling cover, no crystallization phenomenon occurs during the formation of the medium borosilicate glass tube, the tube breaking phenomenon caused by the excessively high glass liquid temperature does not occur, and the formation of the medium borosilicate glass tube 19 is stable.
Claims (3)
1. A method for preventing crystallization on the surface of a medium borosilicate glass tube is characterized in that: the glass liquid (2) fired by the glass kiln enters a material channel (1), a thermocouple (6) measures the temperature of the glass liquid, and a heating rod (4) and a silicon carbide rod (8) control the temperature of the glass liquid in the material channel and a material basin (10) to be 1345-1355 ℃ according to the temperature signals of the thermocouple; the temperature of the glass liquid is always controlled to 1345-1355 ℃ under the action of an intermediate frequency heating device (12) at the position of a material bowl (13); an air cooling cover (11) is arranged at the periphery of the material bowl and the end head (14); air is blown into a spiral air duct (15) of the air cooling cover, an air inlet (18) of the air cooling cover is high-pressure air, the temperature is stably controlled at 19-21 ℃, and the temperature of an air outlet (17) of the air cooling cover is controlled at 115-125 ℃; controlling the temperature of glass liquid at the end (14) to 1245-1255 ℃ through the air cooling effect of the air cooling cover; the air-cooled cooling cover (11) is cylindrical and is divided into an inner layer and an outer layer, a spiral partition plate (16) with spiral ascending is arranged between the inner layer and the outer layer of the air-cooled cooling cover, a spiral air duct (15) is formed between the inner layer and the outer layer of the air-cooled cooling cover, and the upper end and the lower end of the inner layer and the outer layer of the air-cooled cooling cover are welded in a sealing manner; the lower end of the air-cooled cooling cover is open, and the upper end is closed; the air outlet (17) is arranged at the upper end of the side wall of the air cooling cover, the air inlet (18) is arranged at the lower end of the side wall of the air cooling cover, and the air outlet is communicated with the atmosphere.
2. The method for preventing the surface crystallization of the medium borosilicate glass tube from occurring according to claim 1, which is characterized in that: the spiral air duct (15) is arranged in 7-8 circles.
3. The method for preventing the surface crystallization of the medium borosilicate glass tube from occurring according to claim 2, which is characterized in that: the peripheries of the material channel (1) and the material basin (10) are provided with heat preservation layers (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211344890.9A CN115626761B (en) | 2022-10-31 | 2022-10-31 | Method for preventing crystallization on surface of medium borosilicate glass tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211344890.9A CN115626761B (en) | 2022-10-31 | 2022-10-31 | Method for preventing crystallization on surface of medium borosilicate glass tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115626761A CN115626761A (en) | 2023-01-20 |
| CN115626761B true CN115626761B (en) | 2023-12-29 |
Family
ID=84907970
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211344890.9A Active CN115626761B (en) | 2022-10-31 | 2022-10-31 | Method for preventing crystallization on surface of medium borosilicate glass tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115626761B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104692620A (en) * | 2013-12-06 | 2015-06-10 | 杨德宁 | Flat glass produced by cooling part anti-crystallization method |
| CN105366920A (en) * | 2015-12-08 | 2016-03-02 | 湖北新华光信息材料有限公司 | Method and device for forming optical glass |
| CN205328850U (en) * | 2015-11-30 | 2016-06-22 | 江苏元升太阳能集团有限公司 | Draw glass stick former perpendicularly |
| CN107915394A (en) * | 2017-11-30 | 2018-04-17 | 河北省沙河玻璃技术研究院 | A kind of calcium and magnesium aluminium silicon building float glass process devitrified glass material path and its application method |
| CN108178493A (en) * | 2018-03-25 | 2018-06-19 | 山东信和光热有限公司 | A kind of superfine glass rods process units |
| CN208667460U (en) * | 2018-08-22 | 2019-03-29 | 安徽古井贡酒股份有限公司 | A kind of air-cooled splicing groove |
-
2022
- 2022-10-31 CN CN202211344890.9A patent/CN115626761B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104692620A (en) * | 2013-12-06 | 2015-06-10 | 杨德宁 | Flat glass produced by cooling part anti-crystallization method |
| WO2015081604A1 (en) * | 2013-12-06 | 2015-06-11 | 杨德宁 | Plate glass produced by process for preventing crystallization in cooling part |
| CN205328850U (en) * | 2015-11-30 | 2016-06-22 | 江苏元升太阳能集团有限公司 | Draw glass stick former perpendicularly |
| CN105366920A (en) * | 2015-12-08 | 2016-03-02 | 湖北新华光信息材料有限公司 | Method and device for forming optical glass |
| CN107915394A (en) * | 2017-11-30 | 2018-04-17 | 河北省沙河玻璃技术研究院 | A kind of calcium and magnesium aluminium silicon building float glass process devitrified glass material path and its application method |
| CN108178493A (en) * | 2018-03-25 | 2018-06-19 | 山东信和光热有限公司 | A kind of superfine glass rods process units |
| CN208667460U (en) * | 2018-08-22 | 2019-03-29 | 安徽古井贡酒股份有限公司 | A kind of air-cooled splicing groove |
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| Publication number | Publication date |
|---|---|
| CN115626761A (en) | 2023-01-20 |
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