CN103936301A - Manufacturing method of float glass, float glass and manufacturing equipment - Google Patents
Manufacturing method of float glass, float glass and manufacturing equipment Download PDFInfo
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- CN103936301A CN103936301A CN201410181885.XA CN201410181885A CN103936301A CN 103936301 A CN103936301 A CN 103936301A CN 201410181885 A CN201410181885 A CN 201410181885A CN 103936301 A CN103936301 A CN 103936301A
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- glass
- gas
- glass ribbon
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Abstract
The invention discloses a method for forming a lubricating layer on the lower surface of glass, a method for manufacturing float glass by using the method, float glass manufactured by using the method and corresponding manufacturing equipment. The manufacturing method of float glass comprises the following steps: continuously supplying molten metal to the horizontal bath level of a molten metal bath containing molten metal, thus forming a glass tape; lifting the glass tape from the bath level, and delivering to a slow cooling furnace through multiple delivery rollers; and in the process of lifting and delivering the glass tape, supplying SO2 gas and vapor to the lower surface layer of the glass tape in an oxidizing environment, thus forming the lubricating layer on the lower surface layer of the glass tape. According to the manufacturing method and equipment in the application, the speed of reaction between the SO2 gas and alkali metal, alkali earth metal and other oxides in the glass can be effectively improved, and the lower surface of the glass tape can be prevented from appearance of various impurities; and meanwhile, the total number of defects at the bottom of the glass can be effectively decreased (6/m<2>), and the scratch depth at the bottom of the glass can be decreased (80mu m or below).
Description
Technical field
The present invention relates to a kind of method that forms lubricant film in lower glass surface, by the method, manufacture the method for float glass, and this kind of prepared float glass of method and corresponding producing apparatus.
Background technology
In the manufacture of float glass, first to the level that accommodates the bath of molten metal, bathe the continuous supply melten glass of face and form glass ribbon, then glass ribbon is mentioned and is pulled out to molten metal bath from the outlet of molten metal bath.Utilization is mentioned this glass ribbon drawing force from the outlet of bath makes it be configured as target thickness.Then, utilize conveying roller carry glass ribbon and sent in leer, when carrying, carry out slow cooling in leer.Afterwards, glass ribbon is cut into predetermined length, manufactures thus tabular float glass.
But, in the manufacture of float glass, when glass ribbon is mentioned from the bath face of molten metal, molten metal is attached to being taken out of from molten metal bath of glass ribbon sometimes below, and is attached on the periphery of runner.The molten metal adhering to generates oxide compound protuberance on the periphery of runner, or corrosion runner periphery and produce recess or small defect, thereby may on glass ribbon, produce pollution or defect.
In order to prevent the generation of oxide compound or the corrosion of periphery on such runner periphery, to take following measures habitually in the past:
1, the runner that uses roller main part to be formed by quartz; By with the quartzy roller main part that forms, can suppress to a certain extent adhering to of molten metal or its oxide compound.
2, on the surface of conveying roller, be formed with carbon film or form vitriol lubricant film at glass ribbon lower surface, utilizing the iris action of carbon film or vitriol lubricant film, reducing the friction between glass ribbon and conveying roller.
In actual production process, the modes that form vitriol lubricant film at glass ribbon lower surface that adopt more, the realization of which be generally glass ribbon mention and the process of carrying in, to glass ribbon lower surface, supply SO
2gas, under well-oxygenated environment with the alkalimetal oxide in glass ribbon or alkaline earth metal oxide reacting generating salt lubricant film and be attached to the lower surface of glass ribbon.
But in actual production process, due to many limiting factors of this reaction itself, for example this reaction required time is longer, causes the formation speed of vitriol lubricant film and thickness can not reach ideal value; Meanwhile, because this speed of response is slower, conventionally need by the excessive SO of supply
2gas, just can reach production required, but now, excessive SO
2gas is etching apparatus gradually, causes production cost too high.
In addition, SO
2can gas pass through reacting generating salt lubricant film, also relevant to the type of glass own.In not all glass, all contain alkalimetal oxide composition, for example the glass of LCD; In this type of glass, should be alkaline earth metal oxide and SO
2gas reaction generates vitriol lubricant film not soluble in water.Due to SO
2be starkly lower than itself and alkalimetal oxide speed of response with alkaline earth metal oxide speed of response, now need to use excessive SO
2gas, causes the more extra production cost that increases.
In order to address the above problem, existing more existing improved methods, for example can be with reference to following file:
1, the patent No. is 200780025869.X
2, the patent No. is 201280009890.1
The former is for adopting at lower glass surface supply SO
2before gas, first to lower glass surface supply, contain alkali-metal inorganic substance, to avoid generating the not vitriol lubricant film of easy cleaning, reduce SO simultaneously
2the supply of gas.The latter supplies SO for adopting under well-oxygenated environment simultaneously
2gas and SO
2gas oxide catalyst, described oxide catalyst belongs to metal oxide, and the method can utilize the effect of catalyzer faster by SO
2gas oxidation, thus the speed of response of the oxide compounds such as basic metal, alkaline-earth metal in itself and glass promoted.
In general, the former and unresolved SO in existing improving one's methods
2gas is by the speed issue of reacting generating salt lubricant film, and although the latter has solved this problem to a certain extent, but it is by utilizing the mode of the catalyzer such as metal oxide, when this quasi-metal oxides is supplied to lower glass surface, due to excess Temperature, catalyzer is easily attached in lower glass surface, causes the lower glass surface can not be smooth, the impurity that has projection material, affects glass quality.
Summary of the invention
In view of this, the invention provides a kind of manufacture method and producing apparatus thereof of float glass, described manufacture method and equipment can effectively improve SO
2in gas and glass, when the speed of response of the oxide compound such as basic metal, alkaline-earth metal, avoid glass ribbon lower surface to occur various impurity; Can realize (6/m of effective minimizing glass bottom defect sums simultaneously
2), reduce glass bottom scratch depth (80 μ m are following).
For solving above technical problem, the technical scheme of the first aspect that the application provides is a kind of manufacture method of float glass, comprising:
To the level that accommodates the molten metal bath of the molten metal face of bathing, supply with melten glass continuously and form glass ribbon, described glass ribbon is mentioned from described bath face, and be transported to leer by a plurality of conveying rollers;
Glass ribbon mention and the process of carrying in, under well-oxygenated environment to supply SO in top layer under glass ribbon
2gas and water vapour, form lubricant film with the lower top layer at described glass ribbon.
Preferably, described lubricant film is alkali metal sulfates and/or alkaline earth metal sulphate.
Preferably, the SO supplying to glass ribbon
2gas and water vapour are at least gaseous phase during top layer under being supplied to glass.
Preferably, glass ribbon mention and the process of carrying in, to passing into wetting SO near glass ribbon
2gas, to form SO at glass ribbon lower surface
2gas and water vapour.
The application also provides the manufacture method of the float glass described in aforementioned any one to prepare the float glass of gained.
The application also provides a kind of producing apparatus of float glass, comprising:
For holding molten metal and melten glass to be supplied to continuously the level bath face of described molten metal, form the molten metal bath of glass ribbon;
For making the leer of described glass slow cooling, and for described glass ribbon is transported to the conveying roller of leer from described molten metal bath;
For glass ribbon supply SO
2the gas supply device of gas and water vapour.
Preferably, described gas supply device is provided with SO
2gas jet and steam jet, described SO
2gas jet and steam jet are in 150mm apart from glass ribbon.
Preferably, described gas supply device is SO independently
2gas supply device and water vapour gas supply device.
Preferably, described gas supply device adopts SO
2gas pass into liquid, aqueous interior after, will carry the SO of moisture
2gas is supplied to glass ribbon, to utilize near temperature glass ribbon to form SO
2gas and water vapour.
Preferably, described SO
2passing into liquid, aqueous interior speed is 200-500L/h.
Preferably, described liquid, aqueous temperature is 40～60 ℃.
Preferably, described liquid, aqueous be any in water, the aqueous solution, the described aqueous solution is sulfurous acid solution or sodium sulfite solution.
Compared with prior art, it is described in detail as follows in the present invention:
The manufacture method of float glass of the present invention mainly adopts following steps:
To the level that accommodates the molten metal bath of the molten metal face of bathing, supply with melten glass continuously and form glass ribbon, described glass ribbon is mentioned from described bath face, and be transported to leer by a plurality of conveying rollers;
Glass ribbon mention and the process of carrying in, under well-oxygenated environment to glass ribbon supply SO
2gas and water vapour, form lubricant film with the lower top layer at described glass ribbon.
The present invention mainly adopts and will in the existing process that directly glass is drawn into annealing furnace from molten metal bath, only pass into SO
2the mode of gas, be improved to described in the application glass ribbon mention and the process of carrying in, under well-oxygenated environment to glass ribbon supply SO
2gas and water vapour, form lubricant film with the lower top layer at described glass ribbon.The manufacture method of the application's float glass has been utilized and has been supplied SO to lower glass surface
2during gas, supply water vapour simultaneously, thereby utilize water vapour catalysis SO
2the speed of response of gas and basic metal, alkaline earth metal oxide etc.The chemical formula of this reaction can be listed below:
SO
2+H
2O+1/2O
2＝H
2SO
4
Na2O+H
2SO
4＝Na
2SO
4+H
2O
CaO+H
2SO
4＝CaSO
4+H
2O
Comprehensive, prior art has adopted SO
2what gas utilized metal oxide catalyst oxidation is used for shortening oxidization time, finally improves W-response speed; The application utilizes the effect of water vapour, impels SO
2gas is reaction generation sulfuric acid gas under well-oxygenated environment faster, thereby it is acid to increase gas, is more conducive to promote finally to generate the speed of response of vitriol.
The application produces after float glass by the manufacture method of above-mentioned float glass, and the formation speed of glass ribbon lower surface vitriol lubricant film is accelerated, and gained vitriol lubricant film is more conducive to glass ribbon lower surface to produce sufficient lubrication; Meanwhile, owing to not adopting the materials such as basic metal material of the prior art or metal oxide, but utilize the effect of water vapour, gained glass ribbon lower surface is smooth, there will not be other impurity of interpolation to be attached to the problems such as lower glass surface.In addition, the defect of the application's gained glass ribbon lower surface and to scratch quantity overall distribution comparatively even, there will not be because of lubricant film form slower, the glass ribbon one side bottom defect causing and scratch the more quality problems of distributed number; Described in the application, the manufacture method of float glass is except improving the overall distribution of glass ribbon lower surface defect and scuffing, and the defect of gained glass ribbon lower surface sum is less and scratch depth is more shallow.
Accompanying drawing explanation
Fig. 1 is the existing SO that only passes into
2gas forms the equipment connection schematic diagram that the manufacture method of traditional float glass of lubricant film adopts;
Fig. 2 is the equipment connection schematic diagram that the manufacture method of the application's the first embodiment float glass adopts;
Fig. 3 is the equipment connection schematic diagram that the manufacture method of the application's the second embodiment float glass adopts;
In Fig. 1-Fig. 3, sign 1: molten metal; 2: molten metal bath; 3: logical N
2device; 4: lower slag case; 5: annealing furnace; 6: pass into SO
2pipe; 7: glass ribbon; 8: conveying roller; 6-1: water vapour gas supply device; 6-2:SO
2gas supply device; 2-6: wetting SO
2feed tube; 10: liquid, aqueous; 11: device for storing liquid; 12:SO
2gas input port.
Fig. 4 is the scintigram that adopts the lower surface of embodiment 1 gained float glass in control experiment 1, can clearly express the south of glass, position, distributed number and the scratch depth of the lower surface defect of North in figure; Wherein the perpendicular short-term in scintigram represents defect or cut;
Fig. 5 is the scintigram that adopts the lower surface of embodiment 3 gained float glasses in controlled trial 1, can clearly express the south of glass, position, distributed number and the scratch depth of the lower surface defect of North in figure; Wherein the perpendicular short-term in scintigram represents defect or cut.
Embodiment
The manufacture method of the application's float glass, comprising:
To the level that accommodates the molten metal bath of the molten metal face of bathing, supply with melten glass continuously and form glass ribbon, described glass ribbon is mentioned from described bath face, and be transported to leer by a plurality of conveying rollers;
Glass ribbon mention and the process of carrying in, under well-oxygenated environment to supply SO in top layer under glass ribbon
2gas and water vapour, form lubricant film with the lower top layer at described glass ribbon.
The application can preferably adopt glass ribbon mention and the process of carrying in, to passing into wetting SO near glass ribbon
2gas, to form SO at glass ribbon lower surface
2gas and water vapour.If the application passes into wetting SO by employing
2the form of gas reaches to supply SO in top layer under glass ribbon
2the mode of gas and water vapour, can effectively control SO
2the volume ratio of gas and water vapour, the defects count of the lower surface of prepared float glass is obviously lower, and scratch depth is more shallow.
In order to make those skilled in the art understand better technical scheme of the present invention, below in conjunction with specific embodiment, the present invention is described in further detail.
Embodiment 1---only under well-oxygenated environment, pass into SO
2gas forms lubricant film:
To the level that accommodates the molten metal bath of the molten metal face of bathing, supply with melten glass continuously and form glass ribbon, described glass ribbon is mentioned from described bath face, and by a plurality of conveying rollers, be transported to leer, glass ribbon mention and the state carried under, glass ribbon bottom is formed with lubricant film; Forming in the following ways of described lubricant film: only supply SO under well-oxygenated environment
2mode, equipment can be with reference to the appliance arrangement of accompanying drawing 1.
Experimental example 2---the application's the first embodiment: pass into SO under well-oxygenated environment
2two kinds of gases of+water vapour form lubricant film
To the level that accommodates the molten metal bath of the molten metal face of bathing, supply with melten glass continuously and form glass ribbon, described glass ribbon is mentioned from described bath face, and by a plurality of conveying rollers, be transported to leer, glass ribbon mention and the state carried under, glass ribbon bottom is formed with lubricant film; Forming in the following ways of described lubricant film: supply SO to glass ribbon lower surface under well-oxygenated environment
2with two kinds of gases of water vapour, equipment can be with reference to the appliance arrangement of accompanying drawing 2.In accompanying drawing 2 for water vapour gas supply device 6-1 and SO
2gas supply device 6-2 is only part example; Present embodiment is mainly employing respectively to glass ribbon 7 lower surface supply water vapour and SO
2the mode of gas, can adopt supply water vapour and SO
2water vapour gas supply device 6-1 and SO
2gas supply device 6-2 laid respectively at apart from glass ribbon 7 lower surface 150mm with interior (as shown in Figure 2), also can adopt steam jet (jet pipe) or the SO of both gas supply devices
2gas jet (jet pipe) is positioned in glass ribbon 7 lower surface 150mm, preferably in 80mm.In addition, can preferably adopt water vapour gas supply device 6-1 to be positioned at SO
2gas supply device 6-2 front end, or steam jet (jet pipe) is positioned at SO
2the mode of gas jet (jet pipe) front end, to promote rapidly SO
2with reacting of material in glass.
Embodiment 3---the application's the second embodiment: pass into wetting SO under well-oxygenated environment
2gas forms lubricant film
The manufacture method of the float glass described in employing the application, to the level that accommodates the molten metal bath of the molten metal face of bathing, supply with melten glass continuously and form glass ribbon, described glass ribbon is mentioned from described bath face, and be transported to leer by a plurality of conveying rollers, glass ribbon mention and the state carried under, glass ribbon bottom is formed with saltcake film; Forming in the following ways of described saltcake film: by SO
2pass into liquid, aqueous after, will carry the wetting SO of moisture
2gas passes into, and utilizes near the temperature of glass ribbon, so that at glass ribbon lower surface supply SO
2gas and water vapour, equipment can be with reference to accompanying drawing 3.Present embodiment has mainly adopted utilizes wetting SO
2gas comes to supply SO in top layer under glass ribbon
2the mode of gas and water vapour, as different from Example 2, present embodiment is not directly supplied SO
2gas and water vapour, but first by SO
2gas passes in liquid, aqueous 10 in device for storing liquid 11, the wetting SO that gas sparging is produced
2gas is by wetting SO
2feed tube 2-6 is fed in glass ribbon 7 lower surface 150mm, preferably in 80mm.
Embodiment 4---controlled trial 1
The following three kinds of glass kinds of preparation:
The glass kind of a, alkali metal containing, alkali-free earth metals;
The glass kind of b, alkali-free metal, alkaline including earth metal;
The glass kind that c, alkali and alkaline earth metal ions all contain.
Each embodiment 1-3 is respectively used to prepare the float glass of above-mentioned a-c, and the defect result of the lower surface of gained float glass is measured by the three-dimensional micro-VHX-2000 of the super depth of field of Keyemce; Each the results list of gained under:
Table one: controlled trial 1 adopts embodiment 1 float glass detected result
Table two: controlled trial 1 adopts embodiment 2 float glass detected results
Table three: controlled trial 1 adopts embodiment 3 float glass detected results
Embodiment 5---controlled trial 2
Adopt the mode of previous embodiment 1-3 to be respectively used to prepare common float glass (thickness of glass is more than 1.1mm) and thin float glass (thickness of glass is more than 1.1mm); Different methods is prepared the defect result of lower surface of the float glass of gained and is measured by the three-dimensional micro-VHX-2000 of the super depth of field of Keyemce; Each the results list of gained under.Meanwhile, by the lower surface of each float glass of gained is scanned, gained scanning is shone can be with reference to accompanying drawing 4-5.
Table four: controlled trial 2 adopts the detected result of embodiment 1 gained float glass
Table five: controlled trial 2 adopts the detected result of embodiment 2 gained float glasses
Table six: controlled trial 2 adopts the detected result of embodiment 3 gained float glasses
Above-mentioned table one to table six is the statistics to different glass kind, type of glass.
Embodiment 6---scheme optimization experiment
The float glass making process of embodiment 3 described in employing the application, but adjust concrete the adopted technical parameter of the method, for example SO in liquid, aqueous composition, liquid, aqueous temperature, gas supply device
2the technical parameters such as distance of jet orifice and glass ribbon have extremely carried out respectively a large amount of research, thereby obtain under different technical parameters, all have certain difference effect.Following experiment is the float glass manufacture adopting with embodiment 3, and difference is, each experiment is directed to different technical parameter values and carries out test-results and prove fully.The glass ribbon of final gained adopts the mode identical with embodiment 4 to measure, and gained measurement result sees the following form.
Technical parameter one: liquid, aqueous composition
Table seven: the impact of liquid, aqueous heterogeneity on float glass making process
Technical parameter two: liquid, aqueous temperature
Table eight: the impact of liquid, aqueous differing temps on float glass making process
Technical parameter three: SO in manufacturing installation
2the distance of jet orifice and glass ribbon
Table nine: SO
2jet orifice is the impact on float glass making process apart from the different distance of glass ribbon lower surface
Below be only the preferred embodiment of the present invention, it should be pointed out that above-mentioned preferred implementation should not be considered as limitation of the present invention, protection scope of the present invention should be as the criterion with claim limited range.For those skilled in the art, without departing from the spirit and scope of the present invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (13)
1. a manufacture method for float glass, comprising:
To the level that accommodates the molten metal bath of the molten metal face of bathing, supply with melten glass continuously and form glass ribbon, described glass ribbon is mentioned from described bath face, and be transported to leer by a plurality of conveying rollers; It is characterized in that:
Glass ribbon mention and the process of carrying in, under well-oxygenated environment to supply SO in top layer under glass ribbon
2gas and water vapour, form lubricant film with the lower top layer at described glass ribbon.
2. the manufacture method of float glass according to claim 1, is characterized in that: described lubricant film is alkali metal sulfates and/or alkaline earth metal sulphate.
3. the manufacture method of float glass according to claim 1, is characterized in that: to the SO of glass ribbon supply
2gas and water vapour are at least gaseous phase during top layer under being supplied to glass.
4. the manufacture method of float glass according to claim 3, is characterized in that: glass ribbon mention and the process of carrying in, to passing into wetting SO near glass ribbon
2gas, to form SO at glass ribbon lower surface
2gas and water vapour.
5. the manufacture method of the float glass described in claim 1-3 any one is prepared the float glass of gained.
6. a producing apparatus for float glass, comprising:
For holding molten metal and melten glass to be supplied to continuously the level bath face of described molten metal, form the molten metal bath of glass ribbon;
For making the leer of described glass slow cooling, and for described glass ribbon is transported to the conveying roller of leer from described molten metal bath;
For glass ribbon supply SO
2the gas supply device of gas and water vapour.
7. the producing apparatus of float glass according to claim 5, is characterized in that: described gas supply device is provided with SO
2gas jet and steam jet, described SO
2gas jet and steam jet are in 150mm apart from glass ribbon.
8. the producing apparatus of float glass according to claim 5, is characterized in that: described gas supply device is provided with the wetting SO of ejection
2gas jet, the SO that described ejection is wetting
2gas jet is in 150mm apart from glass ribbon.
9. the producing apparatus of float glass according to claim 5, is characterized in that: described gas supply device is SO independently
2gas supply device and water vapour gas supply device.
10. the producing apparatus of float glass according to claim 5, is characterized in that: described gas supply device adopts SO
2gas pass into liquid, aqueous interior after, will carry the SO of moisture
2gas is supplied to glass ribbon, to utilize near temperature glass ribbon to form SO
2gas and water vapour.
11. float glass making equipments according to claim 8, is characterized in that: described SO
2passing into liquid, aqueous interior speed is 200-500L/h.
12. float glass making equipments according to claim 8, is characterized in that: described liquid, aqueous temperature is 40～60 ℃.
13. float glass making equipments according to claim 8, is characterized in that: described liquid, aqueous any in water, the aqueous solution, the described aqueous solution is sulfurous acid solution or sodium sulfite solution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410181885.XA CN103936301A (en) | 2014-04-30 | 2014-04-30 | Manufacturing method of float glass, float glass and manufacturing equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410181885.XA CN103936301A (en) | 2014-04-30 | 2014-04-30 | Manufacturing method of float glass, float glass and manufacturing equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103936301A true CN103936301A (en) | 2014-07-23 |
Family
ID=51184224
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410181885.XA Pending CN103936301A (en) | 2014-04-30 | 2014-04-30 | Manufacturing method of float glass, float glass and manufacturing equipment |
Country Status (1)
| Country | Link |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0214841A (en) * | 1988-06-29 | 1990-01-18 | Nippon Sheet Glass Co Ltd | Furnace for transporting glass and transportation of glass in said furnace |
| JPH0678181B2 (en) * | 1988-10-27 | 1994-10-05 | セントラル硝子株式会社 | Glass surface treatment method |
| JP2007204295A (en) * | 2006-01-31 | 2007-08-16 | Asahi Glass Co Ltd | Plate glass for display substrate and its manufacturing method |
| CN101489946A (en) * | 2006-07-07 | 2009-07-22 | 旭硝子株式会社 | Process for producing alkali-free glass substrate |
| CN101652329A (en) * | 2007-04-03 | 2010-02-17 | 旭硝子株式会社 | Process for producing flat glass, apparatus for forming buffer layer of flat glass, and flat glass producing equipment |
| CN103391902A (en) * | 2011-02-21 | 2013-11-13 | Lg化学株式会社 | Device for forming glass surface lubricating layer, annealing furnace and device for manufacturing glass having same |
-
2014
- 2014-04-30 CN CN201410181885.XA patent/CN103936301A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0214841A (en) * | 1988-06-29 | 1990-01-18 | Nippon Sheet Glass Co Ltd | Furnace for transporting glass and transportation of glass in said furnace |
| JPH0678181B2 (en) * | 1988-10-27 | 1994-10-05 | セントラル硝子株式会社 | Glass surface treatment method |
| JP2007204295A (en) * | 2006-01-31 | 2007-08-16 | Asahi Glass Co Ltd | Plate glass for display substrate and its manufacturing method |
| CN101489946A (en) * | 2006-07-07 | 2009-07-22 | 旭硝子株式会社 | Process for producing alkali-free glass substrate |
| CN101652329A (en) * | 2007-04-03 | 2010-02-17 | 旭硝子株式会社 | Process for producing flat glass, apparatus for forming buffer layer of flat glass, and flat glass producing equipment |
| CN103391902A (en) * | 2011-02-21 | 2013-11-13 | Lg化学株式会社 | Device for forming glass surface lubricating layer, annealing furnace and device for manufacturing glass having same |
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Application publication date: 20140723 |
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