KR101422162B1 - Apparatus and method for manufacturing float glass - Google Patents

Apparatus and method for manufacturing float glass Download PDF

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KR101422162B1
KR101422162B1 KR1020100062115A KR20100062115A KR101422162B1 KR 101422162 B1 KR101422162 B1 KR 101422162B1 KR 1020100062115 A KR1020100062115 A KR 1020100062115A KR 20100062115 A KR20100062115 A KR 20100062115A KR 101422162 B1 KR101422162 B1 KR 101422162B1
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roller
lift
base
glass ribbon
glass
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KR1020100062115A
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Korean (ko)
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KR20120001368A (en
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김한국
하덕식
방정식
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주식회사 엘지화학
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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

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Surface Treatment Of Glass (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)

Abstract

The present invention relates to a float glass manufacturing apparatus comprising at least one or more lift-out rollers for lifting a glass ribbon that is formed while advancing from a molten metal in a float bath and supplying the glass ribbon to the annealing furnace; And a base roller that can be rotated in contact with the corresponding lift-out roller to remove foreign matters adhering to the surface of the lift-out roller.

Figure R1020100062115

Description

[0001] Apparatus and method for manufacturing float glass [

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for manufacturing a float glass, and more particularly, to a float glass manufacturing apparatus and a float glass manufacturing apparatus improved in a method of removing a dross from a lift- And methods.

In general, most of the plate glass including the glass substrate for display is manufactured by the float method or the fusion method. Unlike the fusion method, the float method can efficiently manufacture a large-sized large-sized plate glass.

Such a float method includes a step of continuously forming a glass ribbon in a float bath storing molten metal (molten tin or the like), and a slow cooling step of slowly cooling the glass ribbon formed by the molding step. The glass ribbon to be formed in the float bath is drawn out of the float bath by two or three lift-out rollers and fed to the slow cooling furnace. In this process, tin and tin oxide (SnO 2 , SnO 2 ) (hereinafter referred to as "dross") tend to adhere to the lower surface of the glass ribbon to be driven, and during the movement of the glass ribbon by the lift- These drosses are likely to stick to the surface of the lift-out roller.

Normally, the roller body of the lift-out roller is formed of heat resistant steel, so that the dross is attached to the surface of the roller body by the adhesive force. Thus, components of the roller body, such as, for example, iron, chromium, nickel, etc., react with oxides of the adhesive dross to form an alloy. Such alloy formation is faster as the internal temperature of the lifting box in which the lift-out roller is installed is higher. Adhesion, alloy formation and oxidation of dross composed of tin oxide on the surface of the lift-out roller causes local corrosion of the surface of the roller body of the lift-out roller, resulting in defects in the surface of the roller body , Such defects causing defects of glass products such as scratches, unnecessary roller marks, micro cracks, etc. on the glass ribbon being rotated in contact therewith.

In order to prevent such a problem, conventionally, a wire or other various types of brushes are brought into contact with the lift-out rollers to remove foreign matter adhering to the roller body. However, this conventional method has the disadvantage that the lifetime of the lift-out roller is shortened by the physical friction for a long time with respect to the lift-out roller although the removal efficiency of the dross can be increased.

On the other hand, when sulfur dioxide is sprayed on the lower surface of the glass ribbon, the sulfur dioxide is reacted with an alkali metal (for example, sodium or the like) present in the glass to produce sodium sulfate, and such sodium sulfate is introduced into the glass A technique for preventing scratches on the underside of the ribbon is known. However, since the glass for LCD is an alkali-free glass, since alkali ions are not present, alkaline earth metal sulfate is formed. This is because the function as a protective film to which a sufficient scratch resistance is to be secured is reduced by half and the removal by an after- There is a problem.

SUMMARY OF THE INVENTION The present invention is conceived to solve the above-mentioned problems, and it is an object of the present invention to provide an image forming apparatus capable of more effectively removing foreign matters of tin sticking to the surface of a lift-out roller by using a base roller for cleaning, It is an object of the present invention to provide an apparatus and a method for manufacturing float glass having a structure that can reduce the amount of sulfur dioxide used by supplying such ionic solution to a lift-out roller via a base roller in the process of forming a protective film on a ribbon. We will do it.

In order to accomplish the above object, the present invention provides a float glass manufacturing apparatus comprising at least one or more lift-out rollers for lifting a glass ribbon, which is formed while advancing from molten metal in a float bath, field; And a base roller that can be rotated in contact with the corresponding lift-out roller to remove foreign substances adhering to the surface of the lift-out roller.

Preferably, the base roller further comprises an adhesive layer formed on the surface thereof.

Preferably, the base roller is made of a material capable of withstanding a temperature range of approximately 950 to 1050 ° C.

Preferably, the surface of the base roller has a roughness of approximately 0.9 to 1.1 micrometers.

Preferably, the apparatus further comprises a blade installed to scrape the surface of the base roller.

Preferably, the apparatus further comprises a collection member capable of collecting foreign matter scraped by the blade.

Preferably, the collection member is a drag can.

Preferably, the apparatus further comprises a protective film-forming member for forming a protective film on the surface of the glass ribbon facing the molten metal.

Preferably, the protective film-forming member comprises: a film-forming liquid supply member capable of supplying an alkali-ion-containing inorganic material to the end lift-out roller side closest to the throat path among a plurality of the lift-out rollers; And a transfer roller capable of transferring the inorganic material supplied from the coating liquid supply member to the end lift-out roller.

Preferably, the transfer roller is an end-base roller disposed in contact with the end lift-out roller.

Preferably, the film-forming liquid supply member is provided below the end-base roller so as to supply the inorganic material to the surface of the end-base roller.

Preferably, the inorganic material is selected from the group consisting of a sodium hydroxide solution, a sodium sulfate solution, a sodium chloride solution, and combinations thereof.

According to another aspect of the present invention, there is provided a method for manufacturing a float glass, comprising the steps of: forming a glass ribbon of a target thickness while pulling a molten glass continuously supplied onto a surface of molten metal accommodated in the float bath from an outlet of the float bath Out rollers for bringing out the glass ribbon from the float bath storing the molten metal by bringing the base rollers into contact with the base rollers to rotate the lift-out rollers, And removing foreign substances adhering to the surface.

Preferably, the method further comprises scraping the surface of the base roller with a blade.

Preferably, the method further comprises collecting foreign matter scraped by the blade into a collection member.

Preferably, the method further comprises forming a protective coating on the surface of the glass ribbon facing the molten metal using a protective film-forming member.

Preferably, the step of forming the protective film comprises: supplying an inorganic substance containing alkali ions using a film-forming liquid supply member provided on the side of the end lift-out roller closest to the throat path among a plurality of the lift-out rollers ; And transferring the inorganic material supplied from the coating liquid supply member to the end lift-out roller using a transfer roller.

Preferably, the transfer roller is an end-base roller disposed in contact with the end lift-out roller.

Preferably, the inorganic material is selected from the group consisting of a sodium hydroxide solution, a sodium sulfate solution, a sodium chloride solution, and combinations thereof.

The apparatus and method for producing float glass according to the present invention have the following effects.

First, since the dross attached to the surface of the lift-out roller is removed by the adhesive base roller, the lifetime of the lift-out roller can be extended and the overall glass production efficiency can be enhanced.

Secondly, by using a tacky base roller in particular, it is possible to reduce the physical impact on the surface of the lift-out roller while effectively removing foreign matter and reduce the cracks on the lower surface of the glass ribbon.

Third, since the alkali ion solution is supplied through the base roller and the solution is transferred to the glass ribbon through the lift-out roller, the protective film is formed on the lower surface of the glass ribbon, thereby reducing the possibility that the lower surface of the glass ribbon becomes uneven It is possible to increase the efficiency in the subsequent polishing process.

Fourth, by reducing the amount of sulfur dioxide used in alkali-free glass (eg, LCD glass), environmental problems can be solved and process costs can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate preferred embodiments of the invention and, together with the description, serve to explain the principles of the invention. It should not be interpreted.
FIG. 1 is a schematic view showing a construction apparatus for a float glass according to a preferred embodiment of the present invention.
FIG. 2 is a view for explaining the operation of the float glass manufacturing apparatus shown in FIG. 1, and is an enlarged view of a base roller portion.

Hereinafter, an apparatus and method for manufacturing a float glass according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms and the inventor may appropriately define the concept of the term in order to best describe its invention It should be construed as meaning and concept consistent with the technical idea of the present invention. Therefore, the embodiments described in this specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

FIG. 1 is a schematic view showing a construction apparatus for a float glass according to a preferred embodiment of the present invention.

1, the apparatus 100 for producing float glass according to the present embodiment is for producing a glass plate by a so-called float method. The apparatus 100 includes a float bath 112 and a float bath 112, Includes a roof 114 and has a float chamber 110 of a closed structure having an inlet (not shown) and an outlet 116.

The float bath 112 stores molten metal M such as molten tin, molten tin alloy, and the like. On the molten metal M, molten glass is supplied from the upstream side (left side in the figure) of the float bath 112 to the downstream side (right side in the figure). In this process, a ribbon of glass ribbon G is formed. The molten metal M flows from the upstream side of the float chamber 110 maintained at a comparatively high temperature by the temperature gradient inside the float bath 112 to the downstream side of the low temperature and at the same time flows from the longitudinal center of the float bath 112 And flows to both sides. The molten glass or glass ribbon G moves from the upstream side toward the downstream side and then is lifted by a lift provided adjacent to the outlet 116 of the float chamber 112 to be away from the bath surface of the molten metal M at the take- - pulled out by the out rollers (122, 124, 126) and moved to the slow cooler (160).

The atmosphere inside the float chamber 110 is composed of a mixture gas of nitrogen and hydrogen. The mixed gas is maintained at a pressure slightly higher than that of the external atmosphere, and is heated to about 800-1300 ° C by an electric heater (not shown) . The molten glass (G) is an alkali-free glass or soda lime glass. The principle and structure of the flow of the molten metal M in the float bath 112 and the introduction, ribboning, movement, and discharge of the molten glass G are well known by a general float method. The description will be omitted.

Three lift-out rollers 122, 124 and 126 are disposed in the lifting box 120. The lift-out rollers 122, 124 and 126 are provided on the upstream side of the float chamber 110 to move the molten glass G moving toward the downstream side of the float chamber 110 onto the surface of the molten metal M, To the cooling lehr 160 located at the outlet side of the lifting box 120. The cooling lehr 160, The lift-out rollers 122, 124 and 126 are each rotated at a predetermined speed by a motor not shown, and each of the lift-out rollers 122, 124 and 126 is moved to a different horizontal position Respectively.

Typically, the roller bodies of the lift-out rollers 122, 124, 126 may be composed of heat resistant steel or ceramics, in particular slip cast and sintered fused silica ceramics. Such molten silica ceramic can prevent the formation of an alloy.

On the other hand, the float bath of molten metal stored in the (112) (M) has a high temperature because it is (approximately 600 ~ 1100 ℃) state, the molten metal (M), the molten glass (G), N 2, H 2, a trace amount of O 2 in the atmosphere , H 2 O and S 2 Etc. are chemically reacted to generate an impurity which is generally called " Dross " (usually, dross is generated at 780 DEG C or less). Particularly, since the vicinity of the take-off point on the downstream side of the float chamber 110 is lower in temperature than the upstream side, the solubility of the molten metal is reduced, and thereby the possibility of generating a foreign substance such as a fine metal oxide, for example, SnO 2 , high. Therefore, when the molten glass or glass ribbon G in the form of a ribbon is pulled up from the take-off point, the draw is drawn out from the float chamber 110 while being attached to the lower surface of the glass ribbon G, The dross may stick to the surface of the lift-out rollers 122, 124, 126 that are rotated in contact with each other.

In view of this, the float glass manufacturing apparatus 100 according to the present embodiment is provided with the base rollers 122, 124, 126 that can be rotated in contact with the corresponding lift-out rollers 122, 124, 126 at positions below the respective lift-out rollers 122, (132, 134, 136). Each of the base rollers 132, 134 and 136 is for removing foreign matter or impurities adhering to the surfaces of the corresponding lift-out rollers 122, 124 and 126 and may be driven by the rotational force of the lift-out rollers 122, 124 and 126, And is configured to be rotated by a separate driving source. In this case, the rotation direction of the base rollers 132, 134, 136 is preferably set to be the same as the rotation direction of the lift-out rollers 122, 124, 126, It will be apparent to those skilled in the art that it may be chosen to be appropriate for removal.

In addition, the base rollers 132, 134 and 136 are preferably provided with adhesive layers 131, 133 and 135 on their surfaces to more effectively remove the dross. In this case, the adhesive layers 131, 133, and 135 may be formed of a material capable of withstanding a high temperature of about 950 to 1050 DEG C (e.g., inorganic fibers such as carbon fiber, silica fiber, alumina fiber, silicon carbide fiber, . It is also preferred that the base rollers 132, 134, 136 have a surface roughness of about 0.9 to 1.1 micrometers. The base rollers 132, 134 and 136 are disposed across the width direction of the glass ribbon G so as to be substantially parallel to the corresponding lift-out rollers 122, It is preferable that the length of the base rollers 132, 134, 136 is substantially equal to or slightly longer than the length of the lift-out rollers 122, 124, 126.

In an alternate embodiment, each of the base rollers 132, 134, 136 may be biased (e.g., resiliently biased) toward the corresponding lift-out rollers 122, 124, 126 by a biasing member (not shown), biased by hydraulic or pneumatic have. This is because it is necessary to bias the base rollers 132, 134 and 136 toward the lift-out rollers 122, 124 and 126 so that the base rollers 132, 134 and 136 can uniformly and stably contact the entire lengthwise direction of the corresponding lift-out rollers 122, There is.

According to a preferred embodiment of the present invention, the float glass manufacturing apparatus 100 further comprises blades 142, 144, 146 provided at the lower portions of the corresponding base rollers 132, 134, 136 so as to be able to scrape the surface of each of the base rollers 132, Respectively. One end of each of the blades 142, 144 and 146 is fixed to the bottom of the lifting box 120 and the other ends of the blades 142, 144 and 146 are brought into contact with the surfaces of the base rollers 132, 134 and 136 to form tips 141, 143 and 145, respectively. An inclined portion is provided around the tips 141, 143, and 145. The blades 142, 144, and 146 are preferably made of a material capable of removing foreign matter adhering to the surfaces of the base rollers 132, 134, and 136 without damaging the surfaces of the base rollers 132, It is preferred that the blades 142,144 and 146 are arranged to be substantially parallel to the corresponding base rollers 132,134 and 136 and the length of the blades 142,144 and 146 is substantially equal to or slightly longer than the length of the base rollers 132,134 and 136. The inclined portions near the tips 141, 143 and 145 of the blades 142, 144 and 146 have a function of guiding foreign matter downward so that the dross, which is scratched by the tips 141, 143 and 145 of the blades 142, 144 and 146, falls into the collecting members 152, 154 and 156 It will be apparent to those skilled in the art that negative inclination can be appropriately selected within the scope of performing such a function.

The apparatus 100 for producing float glass according to the preferred embodiment of the present invention includes a can structure member 152, 154, 156 that is disposed adjacent to each blade 142, 144, 146 and is capable of collecting foreign matter scratched and dropped by the blades 142, 144, 146 . The collection members 152, 154 and 156 are can structures that are fixed to the bottom surface of the lifting box 120 and open at the top thereof so as to collect foreign substances that are guided substantially through the tips 141, 143, 145 of the blades 142, 144, And size can be selected within an appropriate range. In addition, the collection members 152, 154, and 156 are preferably selectively removably installed in the lifting box 120 by a slide device (not shown) including a rail or the like from the lifting box 120.

FIG. 2 is a view for explaining the operation of the float glass manufacturing apparatus shown in FIG. 1, and is an enlarged view of a base roller portion.

1 and 2, a float glass manufacturing apparatus 100 according to a preferred embodiment of the present invention includes a glass ribbon G that faces the molten metal M (that is, inside the lifting box 120) And a protective film forming member 150 for forming a protective film on the lower surface of the traveling glass ribbon G. [

The protective film forming member 150 is made of an inorganic material containing an alkali metal capable of reacting with the sulfuric acid gas to be applied to the lower surface of the glass ribbon G. The protective film forming member 150 is made of a glass ribbon G In order to prevent scratches on the protective film. Here, the alkali metal-containing inorganic material refers to an inorganic substance containing, for example, lithium (Li), sodium (Na), potassium (K), cesium (Cs) When the alkali metal is supplied to the lower surface of the glass ribbon by an indirect (transfer) method using this alkali metal-containing inorganic material and then the SO 2 gas is supplied, the protective film containing the salt of the alkali sulfate is irradiated with the glass ribbon G ) Can be generated efficiently on the lower surface of the screen. In addition, such a protective film can be easily removed in the cleaning process. Furthermore, since the same protection effect is obtained even when the amount of the SO 2 gas is reduced, the occurrence of scratches on the bottom surface of the glass ribbon can be suppressed while reducing the amount of the sulfur dioxide used. This is because an alkali metal source containing an alkali metal-containing inorganic material is supplied from the outside in an indirect transfer system to obtain a reactive organism (calcium sulfate, strontium sulfate, etc.) of an SO 2 gas and an alkaline earth metal as a protective film The same effect can be obtained with an SO 2 gas amount smaller than the SO 2 gas amount.

To this end, in the float glass manufacturing apparatus 100 according to the preferred embodiment, the protective film forming member 150 is mounted on the end lift-out rollers 122, 124, 126 located closest to the throat 160, A coating liquid supply member 155 capable of supplying an inorganic material containing an alkali metal (ionic form) to the side of the end lift-out roller 126, and an inorganic material supplied from the coating liquid supply member 155 to the end lift- And a transfer roller (not shown) that can be indirectly transferred.

The transfer roller may be installed separately from the end base roller 136. In this embodiment, the end base roller 136 disposed in contact with the end lift-out roller 126 among the plurality of base rollers 132, 134, Function together. That is, the end base roller 136 has a function of removing foreign substances present on the surface of the end lift-out roller 126 and a function of supplying the coating liquid supplied from the coating liquid supply member 155 to the end lift-out roller 126 And functions as a transfer roller for transferring.

The coating liquid supply member 155 is installed under the end base roller 136 so as to be arranged in parallel with the end blade 146 to supply an inorganic material to the surface of the end base roller 136.

On the other hand, an inorganic material containing Na is, specifically, for example, NaOH, Na 2 S, NaCl, NaF, NaBr, NaI, soda ash, NaNH 2, sodium benzyl oxide, NaBH 4, NaCN, NaNO 3, Na 2 B 4 O 7 and 10H 2 O (four sodium borate decahydrate), Na 2 B 4 O 7 , (C 2 H 5) 4 BNa and the like are used, all of which are either one may be used alone, in combination of two or more .

Inorganic material containing K is, specifically, for example, KOH, KCl, KF, KBr, KI, KCN, K 2 CO 3, gluconic acid potassium, KHF 2, KNO 3, K 2 B 4 O 7 and 4H 2 O (potassium tetraborate tetrahydrate), K 2 B 4 O 7 , KBF 4 , and the like, which may be used alone or in combination of two or more.

Specifically, for example, CsOH, CsCl, CsF, CsBr, CsI, cesium acetylacetonate, HCO 2 Cs, CsNO 3 and the like are used as the inorganic substance containing Cs, May be used in combination.

The coating liquid supply member 155 may have a structure in which the pipes provided at the ends of the nozzles are arranged in a line below the end base roller 136, and the ends of the plurality of branch pipes branched from one of the pipes Or may be a structure in which a nozzle is installed. In addition, it is preferable that the ends of the coating liquid supply member 155 are spaced apart from the tips of the end blades 146 to some extent, and a separate blocking film (not shown) is preferably formed therebetween. This blocking film is for preventing the inorganic material supplied from the coating liquid supply member 155 from penetrating into the collection member 156.

The apparatus 100 for manufacturing float glass according to the preferred embodiment of the present invention includes the gas supply member 170 for supplying the sulfur dioxide to the lower surface of the glass ribbon G coming out from the end of the lifting box 120 . That is, the gas supplying member 170 supplies SO 2 gas to the lower surface of the glass ribbon G to which the alkali metal is supplied and attached by the transferring method to form alkali salts of sulfuric acid (for example, sodium sulfate) To form a protective coating. The gas supply member 170 may include a plurality of nozzle structures provided in a lower portion of the glass ribbon G in the width direction of the glass ribbon G. [

Reference numeral 127 in FIG. 1 denotes a plurality of drape members provided on the ceiling of the lifting box 120, and 167 denotes a drape member provided on the ceiling of the slow cooling furnace 160. Reference numeral 162 denotes Lehr rolls provided in the gradual cooling path 160 so as to allow the glass ribbon G to be transported.

The operation of the apparatus 100 for manufacturing float glass according to the preferred embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG.

First, the glass ribbon G is formed by molding conditions such as a predetermined closed gas atmosphere and a temperature condition inside the float chamber 110 composed of the float bath 112 and the roof 114. The formed glass ribbon G is lifted from the downstream side (take-off point) of the float chamber 110 by the lift-out rollers 122, 124 and 126 provided to be rotatably installed in the lifting box 120, And is drawn out through the outlet 116. The continuous glass ribbon G is supplied from the lifting box 120 to the side of the throat 160 by the rotation of the lift-out rollers 122, 124 and 126, And is gradually cooled to a required temperature range within the annealing furnace 160 in which the inner atmosphere is maintained at a predetermined temperature condition while traveling on the rare rollers 162. [

In this process, the dross D that may be generated inside the float chamber 110 is attached to the lower surface of the glass ribbon G and is moved into the lifting box 120 together with the glass ribbon G, The loss D adheres to the lift-out rollers 122, 124 and 126. The dross D attached to the surfaces of the lift-out rollers 122, 124 and 126 adheres to the adhesive layers 131, 133 and 135 of the base rollers 132 and 134 and 136 and the base rollers 132 and 134 and 136 are finally rotated to the blades 142, 144 and 146 And collected into the collection members 152, 154, 156.

On the other hand, the coating liquid supply member 155 of the protective film forming member 150 supplies an alkali metal-containing inorganic material to the end base roller 136, and the inorganic material thus supplied contacts the end base roller 136 Out roller 126. The inorganic material transferred to the end lift-out roller 126 is transferred to the lower surface of the running glass ribbon G. The end lift- The alkali metal thus transferred to the glass ribbon G reacts with the SO 2 gas supplied by the gas supply member 170 to generate a protective coating containing the alkali sulfate on the lower surface of the glass ribbon G. [ This protective coating is removed from the glass substrate in a separate cleaning process.

As described above, the end base roller 136 of the protective film forming member 150 is for transferring the alkali metal-containing inorganic material supplied from the coating liquid supply member 155 to the end lift-out roller 126, According to an alternative embodiment, a separate transfer roller that is installed in contact with the end lift-out roller 126 may be used.

The method for manufacturing a float glass according to the preferred embodiment of the present invention is characterized in that the molten glass G continuously supplied onto the surface of the molten metal M accommodated in the float chamber 110 is supplied to the outlet 116 of the float chamber 110, Out roller for drawing the glass ribbon G from the float chamber 110 in the process of forming the glass ribbon of the target thickness while pulling the glass ribbon G from the float chamber 110 and conveying the glass ribbon G to the gradual cooling path 160. [ Such as tin oxide, which adhere to the surfaces of the lift-out rollers 122, 124, 126 by rotating the base rollers 132, 134, 136 against the rollers 122, 124, 126.

This process differs from conventional methods in that the base rollers 132, 134, 136 having adhesive layers 131, 133, 135, for example, are removed from the lift-out rollers, unlike the brush members installed to contact the lift- The rollers 122, 124 and 126 are rotated so as to be in contact with the lift-out rollers 122, 124 and 126 to remove foreign substances from the surfaces of the lift-out rollers 122, 124 and 126, The lifetime of the lift-out rollers 122, 124, 126 can be extended by reducing the physical impact applied.

In the method for producing float glass according to the preferred embodiment of the present invention, the dross D adhering to the surface of the base rollers 132, 134, 136 is scraped with the blades 142, 144, 146 to remove from the surface of the base rollers 132, The surface of the base rollers 132, 134, and 136 can always contact the retrieve rollers 122, 124, 126 in a clean state, thereby improving the removal efficiency. Further, the dross D scraped by the blades 142, 144, 146 is collected by the collection members 152, 154, 156.

In the preferred embodiment of the present invention, in the method of removing dross on the surfaces of the lift-out rollers 122, 124 and 126 by using the base rollers 132, 134 and 136, And utilizing the end base roller 136 as a kind of transfer roller to form the transfer roller. The method according to the present embodiment is advantageous in that an alkali ion containing inorganic material capable of forming a protective coating on an end base roller 136 having a primary purpose for removing dross present on the surface of the end lift- It is a method of transferring matter.

In the preferred embodiment, the protective film forming step includes a film liquid supply member 155 provided on the end lift-out roller 126 side closest to the throat 160 among the plurality of lift-out rollers, Out roller 126 by using an end-base roller 136 provided so as to be in contact with the end-lift-out roller 126. The end-

In an alternative embodiment, a method of supplying the coating liquid to the end lift-out roller 126 may be a method of utilizing a transfer roller (not shown) separately provided in addition to the end base roller 136.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not to be limited to the details thereof and that various changes and modifications will be apparent to those skilled in the art. And various modifications and variations are possible within the scope of the appended claims.

100 ... Float glass manufacturing equipment 110 ... Float chamber
112 ... Float Bath 114 ... roof
116 ... Exit 120 ... Lifting box
122, 124, 126 ... Lifting-out rollers 127 ... Drape member
131, 133, 135 ... Adhesive layers 132, 134, 136 ... Base roller
141, 143, 145 ... Tips 142, 144, 146 ... blade
152,154,156 ... The collection member 155 ... The film-
160 ... 162 ... Rare roller
167 ... The drape member 170 ... Gas supply member

Claims (20)

At least one or more lift-out rollers for lifting and feeding the glass ribbon being formed from the molten metal inside the float bath while being supplied to the annealing furnace; And
And a base roller rotatable in contact with the lift-out roller so as to remove foreign matter adhering to the surface of the lift-out roller. The method according to claim 1,
Wherein the base roller further comprises an adhesive layer formed on a surface of the base roller. The method according to claim 1,
Wherein the base roller is made of a material capable of withstanding a temperature range of 950 to 1050 占 폚. The method according to claim 1,
Wherein the surface of the base roller has a roughness of 0.9 to 1.1 micrometers. The method according to claim 1,
Further comprising a blade installed to scrape the surface of the base roller. 6. The method of claim 5,
Further comprising a collecting member capable of collecting foreign substances scraped by the blade. The method according to claim 6,
Wherein the collection member is a draw-can. The method according to claim 1,
Further comprising a protective film forming member for forming a protective film on a surface of the glass ribbon facing the molten metal. 9. The method of claim 8,
The protective film forming member comprises:
A coating liquid supply member capable of supplying an alkali-ion-containing inorganic material to the end lift-out roller side closest to the throat path among a plurality of the lift-out rollers; And
And a transfer roller capable of transferring the inorganic material supplied from the coating liquid supply member to the end lift-out roller. 10. The method of claim 9,
Wherein the transfer roller is an end base roller disposed in contact with the end lift-out roller. 10. The method of claim 9,
Wherein the coating liquid supply member is provided at a lower portion of the end base roller so as to supply the inorganic material to the surface of the end base roller. 10. The method of claim 9,
Wherein the inorganic material is selected from the group consisting of a sodium hydroxide solution, a sodium sulfate solution, a sodium chloride solution, and combinations thereof. There is provided a float glass manufacturing method for forming a glass ribbon having a target thickness while drawing a molten glass continuously supplied onto the surface of a molten metal accommodated in a float bath from the outlet of the float bath and transporting the glass ribbon to the annealing furnace ,
And removing the foreign matter adhered to the surface of the lift-out roller by rotating the base roller against the lift-out roller for drawing the glass ribbon from the float bath storing the molten metal, Gt; 14. The method of claim 13,
And scraping the surface of the base roller with a blade. 15. The method of claim 14,
And collecting foreign matter scraped by the blade into a collection member. 14. The method of claim 13,
Further comprising the step of forming a protective coating on the surface of the glass ribbon facing the molten metal using a protective film forming member. 17. The method of claim 16,
Wherein the protective film forming step comprises:
Supplying an inorganic substance containing an alkali ion by using a film-forming liquid supply member provided on an end lift-out roller side closest to the throat path among a plurality of the lift-out rollers; And
Further comprising the step of transferring the inorganic material supplied from the coating liquid supply member to the end lift-out roller using a transfer roller. 18. The method of claim 17,
Wherein the transfer roller is an end-base roller disposed in contact with the end lift-out roller. 18. The method of claim 17,
Wherein the inorganic material is any one selected from the group consisting of a sodium hydroxide solution, a sodium sulfate solution, a sodium chloride solution, and combinations thereof. delete
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JP2000281365A (en) * 1999-04-01 2000-10-10 Nippon Sheet Glass Co Ltd Production of float type sheet glass and apparatus for production therefor
WO2002051767A1 (en) 2000-12-26 2002-07-04 Nippon Sheet Glass Co.,Ltd. Plate glass with protective film and method of manufacturing the plate glass
KR20030041800A (en) * 2001-11-20 2003-05-27 칼-짜이스-슈티푸통 트레이딩 에즈 쇼트 그라스 Device supporting a ribbon of glass
JP2009056378A (en) 2007-08-30 2009-03-19 Sd Future Technology Co Ltd Dust collector for substrate

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Publication number Priority date Publication date Assignee Title
JP2000281365A (en) * 1999-04-01 2000-10-10 Nippon Sheet Glass Co Ltd Production of float type sheet glass and apparatus for production therefor
WO2002051767A1 (en) 2000-12-26 2002-07-04 Nippon Sheet Glass Co.,Ltd. Plate glass with protective film and method of manufacturing the plate glass
KR20030041800A (en) * 2001-11-20 2003-05-27 칼-짜이스-슈티푸통 트레이딩 에즈 쇼트 그라스 Device supporting a ribbon of glass
JP2009056378A (en) 2007-08-30 2009-03-19 Sd Future Technology Co Ltd Dust collector for substrate

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