KR20140096032A - Method for cleaning rear roll, and glass plate production device - Google Patents

Method for cleaning rear roll, and glass plate production device Download PDF

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Publication number
KR20140096032A
KR20140096032A KR1020147010799A KR20147010799A KR20140096032A KR 20140096032 A KR20140096032 A KR 20140096032A KR 1020147010799 A KR1020147010799 A KR 1020147010799A KR 20147010799 A KR20147010799 A KR 20147010799A KR 20140096032 A KR20140096032 A KR 20140096032A
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South Korea
Prior art keywords
rear roll
roll
defect
glass
lift
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KR1020147010799A
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Korean (ko)
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KR101512607B1 (en
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가츠유키 나카노
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아사히 가라스 가부시키가이샤
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B1/00—Cleaning by methods involving the use of tools
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B18/00—Shaping glass in contact with the surface of a liquid
    • C03B18/02—Forming sheets
    • C03B18/20—Composition of the atmosphere above the float bath; Treating or purifying the atmosphere above the float bath
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B35/00—Transporting of glass products during their manufacture, e.g. hot glass lenses, prisms
    • C03B35/14—Transporting hot glass sheets or ribbons, e.g. by heat-resistant conveyor belts or bands
    • C03B35/16—Transporting hot glass sheets or ribbons, e.g. by heat-resistant conveyor belts or bands by roller conveyors
    • C03B35/168—Means for cleaning the rollers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
    • G01N21/892—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles characterised by the flaw, defect or object feature examined
    • G01N21/896—Optical defects in or on transparent materials, e.g. distortion, surface flaws in conveyed flat sheet or rod
    • 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)
  • Textile Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)

Abstract

According to the present invention, there is provided a process for producing a glass ribbon, comprising the steps of introducing a molten glass onto a molten tin surface of a molten tin bath, drawing the molten glass from the molten tin bath to a lift-out region under non-oxidizing atmosphere to form a glass ribbon, When the glass plate is manufactured by transporting the glass ribbon from the lift-out area to the rear area under the oxygen atmosphere and transporting the glass ribbon to the rear roll provided in the rear area, the surface of the glass plate is inspected for defects, To which the rear roll removing member is brought into contact with the rear roll attached with the foreign matter forming the rear roll.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method of cleaning a rear roll,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning method of a rear roll and a glass plate manufacturing apparatus when a glass plate is manufactured by a float method.

Most of glass plates for architectural, automobile, and liquid crystal displays are manufactured by the float method. In the float process, molten glass is introduced onto a molten tin surface of a molten tin bath (float bath), and the molten glass is formed into a smooth, continuous sheet-like glass, and then the glass is taken out to the lift- The ribbon is transported in a rear region until it becomes a temperature at which it can be easily cooled while being slowly cooled and cut to a size corresponding to the purpose of use to produce a glass plate.

In the production of the glass sheet by the float method, foreign substances such as molten tin, tin compounds, exfoliated materials peeled off from the surface of the roll, and glass scraps (hereinafter simply referred to as "Quot; foreign matter ") is liable to adhere. When the surface of the lift-out roll that conveys the glass ribbon downstream is in contact with the surface of the glass ribbon to which the foreign matter is adhered, if the foreign matter adheres to the surface of the lift-out roll, the foreign matter adhering to the surface of the lift- Contacts the surface of the glass ribbon conveyed to the rear region, reattached to the glass ribbon surface, or forms defects on the glass ribbon surface.

Patent Document 1 proposes a technique of removing foreign matter adhering to the surface of a lift-out roll by a plate-shaped removing member made of carbon. However, in this technique, a clearance is generated between the lift-out roll and the removing member, so that the molten tin can not be completely removed from the surface of the lift-out roll, and the molten tin is reattached to the glass ribbon. In addition, when the plate-shaped removing member is pressed against the lift-out roll to eliminate the gap, there is a problem that vibration occurs in the lift-out roll and scratches occur on the surface of the glass ribbon.

To solve the above problem, Patent Document 2 proposes a glass sheet manufacturing apparatus (Fig. 6) using a heat-resistant fiber sheet as a foreign matter removing member attached to the surface of a lift-out roll.

The glass plate manufacturing apparatus 100 shown in Fig. 6 is divided into a float bath region S, a lift-out region T, and a rear region U. Further, the glass plate manufacturing apparatus 100 is provided with a glass melting section (not shown) upstream of the float bath region S.

A molten tin bath (7) is provided in the float bath region (S). The float bath region S is supplied with a purge gas such as nitrogen by a gas supply source (not shown) and is maintained in a non-oxidizing atmosphere (reducing atmosphere or inert atmosphere). The molten tin bath (7) is filled with molten tin (SN) for introducing molten glass (G).

The lift-out region T is maintained in a high-temperature state (the melting point of tin is about 230 占 폚) in which tin is melted in a non-oxidizing atmosphere like the float bath region S. The lift-out region T is provided with a lift-out roll 22 for drawing the molten glass G on the surface of the molten tin SN of the float bath region S and transporting the glass ribbon GR downstream (direction A in Fig. 6). Each lift-out roll 22 is provided with a lift-out roll removing device 25. The removing device 25 for the lift-out roll includes a lift-out roll removing member 24 for removing foreign matter adhering to the surface of the lift-out roll 22 and a supporting member 26 having a lift-out roll removing member 24 . The removing device 25 for the lift-out roll is provided such that the removing member 24 for the lift-out roll is resiliently contacted with the lower portion of the lift-out roll 22. The lift-out roll removing member 24 is made of a heat-resistant fiber sheet. For example, inorganic fibers such as carbon fiber, silica fiber, alumina fiber, silicon carbide fiber and metal fiber are used.

The rear region U is maintained in an oxygen-containing atmosphere. The rear region U is provided with a rear roll 42 for conveying the glass ribbon downstream.

According to the glass sheet manufacturing apparatus 100, the foreign matter adhered to the lift-out roll 22 is removed by the lift-out roll removing member 24 in contact with the lift-out roll 22. Further, the lift-out roll removing member 24 is brought into tight contact with the lift-out roll without vibration. This prevents the formation of defects in the glass ribbon GR surface and the glass plate GP.

However, when the glass plate is manufactured using the glass plate manufacturing apparatus 100, foreign matter may be present on the surface of the glass ribbon GR to the rear region U without being completely removed from the lift-out region T. Even a small amount of foreign matter remaining up to the rear region U is not allowed even when a glass plate to be produced is required to have a very high quality.

Patent Document 2 suggests that the lift-off roll removing device 25 may be installed not only at any position of the lift-out region T but also at the upstream portion of the rear region U into which the purge gas is introduced from the lift-out region T . However, the rear region U is maintained in the oxygen atmosphere as compared with the lift-out region T, and the oxidation of the removing member proceeds gradually. As a countermeasure thereto, a non-oxidizing gas is blown into the heat-resistant fiber sheet to protect the heat-resistant fiber sheet in a non-oxidizing atmosphere, or to remove foreign substances adhering to the lift- The distance in the A direction can be extended. However, a large amount of purge gas is supplied to the heat-resistant fibers or the lift-out area in order to keep all the wide space in a non-oxidizing atmosphere, resulting in a problem that the manufacturing cost of the glass plate is increased.

Japanese Patent Application Laid-Open No. 11-335127 Japanese Patent Application Laid-Open No. 2009-46366

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a method of manufacturing a glass plate by a float method, in which a foreign matter adhering to a surface of a rear roll from a glass ribbon surface, A cleaning method of a rear roll and a glass plate manufacturing apparatus are provided.

In order to achieve the above object, the present invention adopts the following configuration.

That is, in the method of cleaning the rear roll of the present invention, the molten glass is introduced onto the molten tin surface of a molten tin bath, the molten glass is drawn out from the molten tin bath to a lift-out region under non-oxidizing atmosphere to make a glass ribbon , The glass ribbon is conveyed from the lift-out area to a rear area under an oxygen atmosphere by a lift-out roll, and the glass ribbon is conveyed to a rear roll provided in the rear area to perform defect inspection on the surface of the glass plate ,

When the defect is detected, the rear roll removing member is brought into contact with the rear roll attached with the foreign material forming the defect.

The method of cleaning a rear roll of the present invention is characterized in that the rear roll removing member includes a driving unit,

An inspection unit for detecting the presence or absence of defects on the surface of the glass plate in the rear region,

A control unit is provided for discriminating a rear roll attached with foreign matter forming the defect and transmitting a mounting signal to the driving unit,

A determination is made as to whether or not a foreign object forming the defect is attached to the control unit by transmitting a defect detection signal from the inspection unit to the control unit when the defect is detected by the inspection unit; The mounting signal of the rear-roll removing member is transmitted,

It is preferable that the drive unit for receiving the mounting signal drives the attaching / detaching device so that the rear roll removing member is brought into contact with the rear roll attached with foreign matter forming the defect.

Further, in the cleaning method of the rear roll of the present invention, it is preferable to use a molded product of carbon or fine particles as the rear roll removing member.

In the method of cleaning a rear roll of the present invention, at least one molded product or fine particle selected from carbon, boron nitride, alkali alkaline earth metal sulfate, alkali alkaline earth carbonate, silica- Is preferably used.

The glass plate producing apparatus of the present invention comprises a molten tin bath filled with molten tin,

A lift-out roll for drawing a molten glass introduced onto the molten tin into a glass ribbon and returning the glass ribbon from a lift-out region under a non-oxidizing atmosphere to a rear region under an oxygen atmosphere,

And a rear roll for transporting the glass ribbon to the rear region,

The glass ribbon or the surface of the glass plate is inspected for defects and when the defects are detected, the rear roll removing member having the detachable device is brought into contact with the rear roll having the foreign matter forming the defect.

The glass plate manufacturing apparatus of the present invention further comprises a detachment device having a drive portion on the rear roll removal member,

An inspection unit for detecting the presence or absence of defects on the surface of the glass plate in the rear region,

A control unit is provided for discriminating a rear roll attached with foreign matter forming the defect and transmitting a mounting signal to the driving unit,

A signal output terminal of the inspection unit is connected to a signal input terminal of the control unit and a signal output terminal of the control unit is connected to a signal input terminal of the drive unit,

Wherein when the defect is detected by the inspection unit, a defect detection signal is transmitted from the inspection unit to the control unit, so that a rear roll attached with foreign matter forming the defect is discriminated in the control unit, The mounting signal of the rear roll removing member is transmitted from the control section,

It is preferable that the drive unit that has received the mounting signal drives the detachable device so that the rear roll removing member is brought into contact with the rear roll attached with the foreign matter forming the defect.

Further, in the glass plate manufacturing apparatus of the present invention, it is preferable to use a molded article of carbon or fine particles as the rear roll removing member.

In the glass sheet manufacturing apparatus of the present invention, at least one molded article or fine particle selected from carbon, boron nitride, alkali alkaline earth metal sulfate, alkali alkaline earth carbonate, silica-based fine particle and alumina fine particle is used as the rear roll removing member .

According to the above method, the rear roll removing member is mounted on the rear roll to which foreign matter forming the defect is attached only while the defect of the glass ribbon conveyed to the rear region is detected. As a result, abrasion of the rear roll removing member is suppressed to the maximum. Further, the time for which the rear roll removal member is exposed to the oxygen atmosphere can be minimized, and oxidation of the rear roll removal member can be prevented. Therefore, the replacement frequency of the rear roll removal member is lowered, and cleaning of the rear roll can be performed efficiently and at low cost.

Further, according to the above method, immediately after the defect is detected by the inspection unit, the control unit can discriminate the rear roll with the foreign matter forming the defect, and mount the rear roll removal member on the identified rear roll. When the defect is not detected in the inspection section, the rear roll removing member can be removed from the identified rear roll immediately. That is, depending on the presence or absence of defects on the surface of the glass ribbon, the rear roll removing member can be attached and detached to the rear roll.

According to the above method, when the rear roll removing member is mounted so as to be in contact with the rear roll, the surface of the rear roll is coated with carbon or boron nitride, alkali / alkaline earth metal sulfate, alkali / alkaline earth carbonate, silica- A thin film can be formed. As a result, foreign matter adhered to the surface of the glass ribbon can be prevented from sticking to the rear roll surface itself.

According to the above configuration, the glass ribbon conveyed to the rear region and the foreign material forming the defects of the cut glass plate are reliably removed, and a high-quality glass plate is produced. Further, abrasion of the rear roll removing member can be suppressed as much as possible. Further, the time for which the rear roll removal member is exposed to the oxygen atmosphere can be minimized, and oxidation of the rear roll removal member can be prevented. Therefore, the replacement frequency of the rear roll removing member in the glass plate manufacturing apparatus can be reduced.

Further, according to the above configuration, immediately after the defects are detected on the surface of the glass ribbon and the glass plate in the inspection section, the rear roll with the foreign matter forming the defect is discriminated by the control section, and the rear roll removal member is mounted do. When the defect is not detected in the inspection section, the rear roll removing member is immediately dropped from the rear roll. That is, depending on the presence or absence of defects on the surface of the glass ribbon, the rear roll removing member is detached and attached to the rear roll.

Further, according to the above configuration, when the rear roll removing member is mounted so as to be in contact with the rear roll, the surface of the rear roll is coated with carbon or boron nitride, an alkali- A thin film is formed. The foreign matter adhering to the surface of the glass ribbon can prevent foreign matter adhering to the glass ribbon surface from adhering to the rear roll surface by the thin film.

According to the present invention, it is possible to provide a method of cleaning a rear roll, which remains on a surface of a glass ribbon without being removed in a lift-out area, and efficiently removes foreign matter adhering to the surface of the rear roll from the glass ribbon surface at low cost . It is also possible to provide a glass plate producing apparatus for producing a glass plate having no defects on its surface. Further, according to the present invention, a very high-quality glass plate is provided.

1 is a sectional view of a glass plate manufacturing apparatus according to a first embodiment of the present invention.
2 (a) to 2 (d) are enlarged views of main portions of the first embodiment of the present invention. Fig. 2 (a) is a perspective view showing an example of a removing member, Fig. 2 (b) is a perspective view showing each configuration of an example of a removing member, (D) is a perspective view of another example of the removing member.
3 (a) and 3 (b) are plan views of essential parts of the first embodiment of the present invention. Fig. 3 (a) is a plan view showing the structure of the rear roll removing device 45, and Fig. 3 (b) is a plan view showing another structure of the rear roll removing device 45. Fig.
4 is a cross-sectional view of a glass plate manufacturing apparatus according to a second embodiment of the present invention.
5 is a plan view of the main part of the second embodiment of the present invention.
6 is a sectional view of a conventional glass plate manufacturing apparatus.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments to which the present invention is applied will be described with reference to the drawings.

(First Embodiment)

As shown in Fig. 1, the glass plate manufacturing apparatus 1 of this embodiment is divided into a float bath region S, a lift-out region T, and a rear region U. In addition, a glass melted portion (not shown) is provided upstream of the float bath region S. In the following description, the downstream side indicates the same direction as the transport direction (the direction A in Fig. 1) of the glass ribbon GR in Fig. 1, and the opposite side is referred to as upstream. Between the float bath region S and the lift-out region T, the space between the lift-out region T and the rear region U is separated by a partition having a gap capable of transporting the glass ribbon.

The float bath region S is provided with a molten tin bath 7 filled with molten tin SN.

A gas supply source (not shown) is provided in the float bath area S, and purge gas for removing oxygen is always supplied to the float bath area S. This is to prevent oxidation of the molten tin SN and to keep the inside of the float bath region S in a non-oxidizing atmosphere. As the purge gas, a nitrogen gas, an argon gas, and a hydrogen-containing nitrogen gas are preferable. Some of the purge gas supplied into the float bath region S flows in the direction P1 in Fig. 1 and is also supplied to the lift-out region T.

A gas supply source (not shown) is provided in the lift-out area T, so that the purge gas is always supplied as in the float bath area S, so that the lift-out area T is maintained in the non-oxidizing atmosphere. Some of the purge gas supplied in the lift-out region T flows in the direction P2 in Fig. 1 and is also supplied to the upstream portion of the rear region U.

In the lift-out area T, a plurality of lift-out rolls 22 are provided at higher positions in the downstream direction in order to lift and transport the glass ribbon GR. The number of the lift-out rolls 22 is determined by the diameter RT of the lift-out roll 22 and the distance in the direction A of the lift-out region T. If the distance LT in the A direction of the lift-out area T is too short, there is a possibility that the glass ribbon is conveyed to the rear area U with a lot of foreign matter attached to the surface of the glass ribbon. On the contrary, if the distance in the direction A of the lift-out area T is too long, the supply amount of the purge gas becomes large, and the manufacturing cost of the glass plate can be extremely high. In view of this situation, it is preferable that the number of the lift-out rolls 22 be determined.

Each lift-out roll 22 is provided with a lift-out roll removing device 25 in the width direction of the lift-out roll 22 (direction perpendicular to the plane of FIG. 1). As shown in Figs. 2A and 2B, the removing device 25 for the lift-out roll includes a lift-out roll removing member 24, a support for supporting the lift-out roll removing member 24, Member (26). The height and width of the removing member 24 and the supporting member 26 for the lift-out roll are preferably determined such that the removing member 24 for the lift-out roll contacts the lower portion of the lift-out roll 22. The removing device 25 for the lift-out roll may be constituted by a combination of the plurality of lift-out roll removing members 24 and the supporting member 26.

A heat-resistant fiber sheet suitable for removing the molten tin SN from the surface of the lift-out roll 22 is used for the removing member 24 for the lift-out roll. As the heat resistant fiber, a fiber of a material resistant to the temperature of the glass ribbon of the lift-out region T is preferable. Specific examples include inorganic fibers such as carbon fiber, silica fiber, alumina fiber, silicon carbide fiber and metal fiber. In particular, a carbon fiber which has a low hardness and is hard to damage the glass ribbon, and which turns out the molten tin SN is more preferable.

The support member 26 has a rectangular parallelepiped shape for supporting the lift-out roll removing member 24 as shown in FIG. 2A. On the upper surface of the support member 26, a cut-out portion 27 for fitting the lift-out roll removing member 24 is provided as shown in Fig. At the center of the cut-off portion 27, a recess 27 'for fixing the position of the lift-out roll removing member 24 is provided. The width and depth of the cut-out portion 27 and the concave portion 27 'are preferably determined in consideration of the size of the lift-out roll removing member 24. 2 (c), a gas path 29 is provided in the support member 26, and a lift out roll removing member 24 (not shown) is connected from the gas supply source It is more preferable to supply the non-oxidizing gas from the inner surface of the fuel cell.

The purge gas from the lift-out region T flows in from the P2 direction and the oxidizing property is weakened at the upstream portion very close to the lift-out region T, although the rear region U is in an oxidizing atmosphere.

The rear region U is provided with a plurality of rear rolls 42 for slowly cooling the glass ribbon GR by horizontally conveying a long distance. The distance in the direction A of the rear region U may be determined in consideration of a distance at which the glass ribbon GR in the high temperature state in the upstream portion of the rear region U can be sufficiently cooled slowly, The number of the rear rolls 42 is determined by the diameter RU of the rear roll 42 and the distance LU in the A direction of the rear region U.

The rear roll 42 on the upstream side is provided with a rear roll removing device 45 in the width direction of the rear roll 42 (the vertical direction of the paper in FIG. 1). The number of the rear rolls 42 that can be equipped with the rear roll removing device 45 is set to a required number of rear rolls 42 that can completely remove foreign matter adhering to the glass ribbon GR surface conveyed to the rear region U And the range in which purge gas from the lift-out region T flows in.

The rear roll removing device 45 is constituted by a rear roll removing member 44 and a supporting member 46 for supporting the rear roll removing member 44 as shown in Figs. 2 (a) and 2 (b). It is preferable that the height of the rear roll removing member 44 and the supporting member 46 is determined so that the rear roll removing member 44 contacts the lower portion of the rear roll 42. [ The rear roll removing device 45 may be configured by a combination of a plurality of rear roll removing members 44 and a supporting member 46.

The rear roll removing member 44 is formed with a thin film on the surface of the rear roll 42 and is suitable for removing foreign matter including tin oxide attached to the surface of the glass ribbon GR by the thin film, A molded article or fine particle of a material having a weak scratching force is used. Concretely, at least one molded product or fine particle selected from carbon, boron nitride, alkali / alkaline earth sulphate, alkali / alkaline earth carbonate, silica-based fine particles and alumina fine particles can be mentioned. The molded product of carbon preferably has a Shore hardness of about 20 to 70 HZ, and is suitable for removal of foreign matter including tin oxide having a high fixing strength. Therefore, it is more preferable that the hardness is high even in the above range. Further, the formed body of boron nitride preferably has a purity of 30% or more.

As shown in Fig. 2 (a), the support member 46 has a rectangular parallelepiped shape for supporting the rear roll removing member 44. As shown in Fig. On the upper surface of the supporting member 46, a cut-off portion 47 for fitting the rear roll removing member 44 is provided as shown in Fig. 2 (b). A recess 47 'is provided at the center of the cutout 47 to fix the rear roll removing member 44 so as not to be separated from the supporting member 46. The width and the depth of the cutout portion 47 and the recess 47 'are preferably determined in consideration of the size of the rear roll removing member 44. 2 (c), a gas passage 49 is provided in the support member 46, and a gas passage 49 is provided from a non-oxidizing gas supply source (not shown) to the rear roll removal member It is more preferable to supply the non-oxidizing gas to the surface of the substrate. 2 (d), it is preferable that the supporting member 46 is provided with a moving mechanism 48 for facilitating the removal and removal of the rear roll removing device 45 from the rear roll 42 desirable.

It is preferable that the rear roll removing device 45 is provided with a detaching device 50 as shown in Fig. 3 (a). The distal end portion 50x of the attaching / detaching device 50 is joined to the end face 46c of the support member 46. [ The attaching / detaching device 50 may be moved manually, or may be driven by a moving mechanism or the like (not shown).

As shown in Fig. 3A, the width w44 of the rear roll removing member 44 is preferably larger than the width w42 of the rear roll 42, and more preferably equal to w42 in terms of cost. When the rear roll removing member 44 is received within the range of both end faces 42a and 42c of the rear roll 42, the rear roll 42 is brought into contact with the rear roll 42 (mounted state). The rear roll removal member 44 moves in the direction B or C in Figure 3 (a) so that both end faces 44a and 44c of the rear roll removal member 44 are moved rearward The rear roll removing member 44 is removed from the rear roll 42 (removed state). When the rear roll removing member 44 is removed from the rear roll 42, it is preferable that the rear roll removing member 44 is configured to be stored in a non-oxidizing atmosphere.

The support member 46 of the rear roll removal device 45 may extend beyond both end surfaces 42a and 42c of the rear roll 42 as shown in Fig. In this case, only the rear roll removing member 44 can be moved, and the supporting member 46 can be fixed. The front end portion 50x of the attaching / detaching device 50 is joined to the end face 44c of the rear roll removing member 44 when the rear roll removing device 45 is provided with the attaching / detaching device 50. [

Next, a method of cleaning the rear roll and a method of manufacturing the glass sheet in the glass sheet manufacturing apparatus 1 will be described with reference to Fig.

The molten glass G generated in the glass fused portion flows into the molten tin SN in the molten tin bath 7 of the float bath region S. Since tin is a metal having a specific gravity higher than that of glass, the molten glass G floats on the surface of the molten tin SN and flows toward the downstream side.

On the downstream side of the molten tin bath 7, the molten glass G formed into a plate shape is pulled up onto the lift-out roll 22 of the lift-out region T. And the molten glass G pulled up becomes a glass ribbon GR. On the glass ribbon GR surface, a large amount of molten tin SN is deposited. A lift-out roll removing member 24 is brought into contact with the surface of the lift-out roll 22, so that a thin film of the material constituting the lift-out roll removing member 24 is formed. The molten tin SN attached to the glass ribbon GR is prevented from adhering to the surface of the lift-out roll by the thin film formed on the surface of the lift-out roll 22 while being conveyed downstream by the lift-out roll 22 . Further, by the rotation of the lift-out roll 22, the molten tin SN attached to the thin film is attached to the removal member 24 for the lift-out roll. In this way, the molten tin SN attached to the surface of the glass ribbon GR is removed.

The glass ribbon GR is transported from the lift-out area T to the rear area U. The glass ribbon GR is gradually cooled while being conveyed by the rear roll 42 in the rear region U and is cut to a target size by a cutter (not shown) provided on the downstream side of the rear region U.

The presence or absence of defects on the surface of the glass ribbon GR or the glass plate GP on the downstream side of the rear region U is inspected. The defect inspection may be performed before or after the cutting of the glass ribbon GR.

When the molten tin SN on the surface of the glass ribbon GR is completely removed in the lift-out region T, no defect is formed on the glass plate GP. Then, the cut glass plate GP is transported to a device that performs processing such as finishing of the glass plate GP installed further downstream of the rear region U. The permissible range of the defect in the defect inspection is set according to the intended purpose or standard of the glass plate.

When the molten tin SN remains on the surface of the glass ribbon GR in the lift-out region T and is transported to the rear region U under the oxidizing atmosphere, the molten tin SN is oxidized to tin oxide. Foreign matter including tin oxide forms scratches or defects on the glass ribbon GR surface.

When a defect is detected on the surface of the glass ribbon GR in the defect inspection, the rear roll 42 to which the foreign object is adhered is specified from conditions such as defect inspection position, defect detection time, distance from each rear roll 42 and the like . The rear roll removing member 44 of the specified rear roll 42 is moved by the attaching / detaching device 50 so as to be mounted on the rear roll 42.

On the surface of the rear roll 42, a thin film of the material constituting the rear roll removing member 44 is formed. Foreign matter adhering to the surface of the rear roll 42 is prevented from oxidizing the foreign matter adhered to the surface of the rear roll 42 by the thin film or adhering foreign matter to the surface of the rear roll 42. When the foreign matter adhering to the surface of the rear roll 42 specified by the surface of the glass ribbon GR is removed by the rear roll removing member 44, defects are not formed on the surface of the glass ribbon GR transported downstream of the rear region U . In the defect inspection, when the defect is not detected from the surface of the glass ribbon GR or the glass plate GP, the rear roll removing device 45 of the specified rear roll 42 is moved by the attaching / detaching device 50 to be in the removed state .

According to the glass plate manufacturing apparatus 1, the rear roll removing device 45 can also be used during normal operation, and only when the foreign object on the glass ribbon GR surface is adhered on the surface of the rear roll 42, As shown in FIG. As a result, the abrasion of the rear roll removing member 44 or the oxidation in the oxygen atmosphere can be suppressed to a minimum, and the replacement frequency of the rear roll removing member 44 can be reduced. Therefore, foreign matter on the surface of the glass ribbon GR or the glass plate GP is reliably removed efficiently and at a low cost, and a high-quality glass plate is produced.

(Second Embodiment)

Hereinafter, a glass plate manufacturing apparatus 2 according to a second embodiment of the present invention will be described with reference to FIG. In the constituent elements shown in Fig. 4, the same constituent elements as those shown in Fig. 1 are denoted by the same reference numerals as those in Fig. 1, and a description thereof will be omitted.

The glass sheet manufacturing apparatus 2 shown in Fig. 4 includes, in addition to the components of the glass sheet manufacturing apparatus 1 of Fig. 1, an inspection section 60 for detecting the presence or absence of defects on the surface of the glass ribbon GR or the glass sheet GP, And a control section 61 for discriminating the rear roll 42 relating to defect formation and for transmitting a signal to the attaching / detaching device 50. [ Further, the attaching / detaching device 50 of each rear roll removing device 45 is provided with a driving part 62. [ The signal output terminal of the inspection section 60 is connected to the signal input terminal of the control section 61 and the signal output terminal of the control section 61 is connected to the drive section 62 of the attaching / detaching device 50 of each rear roll removal device 45 .

5, in addition to the structure of the rear roll removing device 45 shown in Fig. 3, the rear roll removing device 45 is provided with the other end portion of the end portion where the front end portion 50x of the attaching / detaching device 50 is provided A driving unit 62 is provided. The driving unit 62 has a function of activating the attaching / detaching device 50 in order to move the rear roll removing device 45 in the direction B or C in FIG. 5 in accordance with a signal from the control unit 61. In the rear roll removing device 45 of the glass plate manufacturing apparatus 2 as well as in the rear roll removing device 45 of Fig. 3 (b), the supporting member 46 is provided on both end faces 42a, 42c.

Next, a cleaning method of the rear roll and a manufacturing method of the glass plate in the glass plate manufacturing apparatus 2 will be described. The description of the same components as those of the cleaning method of the rear roll and the manufacturing method of the glass plate in the glass plate manufacturing apparatus 1 will be omitted.

When a defect is detected on the surface of the glass ribbon GR or the glass plate GP in the inspection unit 60, a defect detection signal is transmitted from the inspection unit 60 to the control unit 61. The control unit 61 having received the defect detection signal calculates the diameter RU of each of the rear rolls 42 recorded in advance, the distance LU in the A direction of the rear region U, the distance between each rear roll 42 and the inspection unit 60, Based on the data such as the detection time, the rear roll 42 to which the foreign material forming the defect is attached is specified. The control section 61 sends a mounting signal of the rear roll removing member 44 to the driving section 62 of the specific rear roll 42. [ The driving unit 62 that has received the mounting signal operates the attaching / detaching device 50 to put the rear roll removing member 44 of the specified rear roll 42 in the mounted state. The foreign matter adhering to the surface of the specified rear roll 42 is removed by the mounted rear roll removing member 44.

If no defect is detected on the surface of the glass ribbon GR or the glass plate GP in the inspection unit 60, a defect removal signal is sent from the inspection unit 60 to the control unit 61. [ The control unit 61, which has received the defect removal signal, transmits the removal signal to the driving unit 62 of the specific rear roll 42. The driving unit 62 that has received the removal signal activates the attaching / detaching device 50 to put the rear roll removing member 44 in the removed state with respect to the specified rear roll 42.

According to the cleaning method and the glass plate manufacturing method of the rear roll using the glass sheet manufacturing apparatus 2, only when the defect of the glass ribbon GR is detected in the inspection section 60, The roll removing member can be mounted.

While the invention has been described in detail and with reference to specific embodiments thereof, it is evident to those skilled in the art that various modifications and changes may be made thereto without departing from the scope and spirit of the invention.

This application is based on Japanese Patent Application No. 2011-237646 filed on October 28, 2011, the contents of which are incorporated herein by reference.

1, 2, 100: glass plate manufacturing apparatus
7: molten tin bath
22: Lift-out roll
24: removal member for lift-out roll
25: Removal device for lift-out roll
26, 46: Support member
42: rear roll
45: Rear roll removing device
44: removal member for rear roll
G: molten glass
GR: Glass ribbon
GP: glass plate
S: float bath area
SN: molten tin
T: Lift-out area
U: Rear area

Claims (8)

The molten glass is introduced into a molten tin surface of a molten tin bath, the molten glass is drawn out from the molten tin bath into a lift-out region in a non-oxidizing atmosphere to form a glass ribbon, To the rear region in the oxygen atmosphere, and when the glass plate is manufactured by transporting the glass ribbon to the rear roll provided in the rear region, the glass plate surface is inspected for defects,
And when the defect is detected, the rear roll removing member is brought into contact with the rear roll attached with foreign matter forming the defect. The method according to claim 1,
And a removable device having a driving portion on the rear roll removing member,
An inspection unit for detecting the presence or absence of defects on the surface of the glass plate in the rear region,
A control unit is provided for discriminating a rear roll attached with foreign matter forming the defect and transmitting a mounting signal to the driving unit,
A determination is made as to whether or not a foreign object forming the defect is attached to the control unit by transmitting a defect detection signal from the inspection unit to the control unit when the defect is detected by the inspection unit; The mounting signal of the rear-roll removing member is transmitted,
And the rear roll removing member is brought into contact with the rear roll attached with the foreign matter forming the defect by driving the attaching / detaching device in the driving unit which has received the mounting signal. 3. The method according to claim 1 or 2,
Wherein the rear roll removing member is formed of carbon or fine particles. 3. The method according to claim 1 or 2,
Wherein at least one molded article or fine particle selected from carbon, boron nitride, alkali alkaline earth metal sulfate, alkali alkaline earth carbonate, silica-based fine particles and alumina fine particles is used as the rear roll removing member. A molten tin bath filled with molten tin,
A lift-out roll for drawing a molten glass introduced onto the molten tin into a glass ribbon and returning the glass ribbon from a lift-out region under a non-oxidizing atmosphere to a rear region under an oxygen atmosphere,
And a rear roll for conveying the glass ribbon in the rear region,
And a glass roll plate or a glass plate which is configured to contact a rear roll removal member provided with a detachment device on a rear roll to which foreign matters forming the defect are attached when defects are detected on the surface of the glass ribbon or the glass plate Device. 6. The method of claim 5,
And a removable device having a driving portion on the rear roll removing member,
An inspection unit for detecting the presence or absence of defects on the surface of the glass plate in the rear region,
A control unit is provided for discriminating a rear roll attached with foreign matter forming the defect and transmitting a mounting signal to the driving unit,
A signal output terminal of the inspection unit is connected to a signal input terminal of the control unit and a signal output terminal of the control unit is connected to a signal input terminal of the drive unit,
Wherein when the defect is detected by the inspection unit, a defect detection signal is transmitted from the inspection unit to the control unit, so that a rear roll attached with foreign matter forming the defect is discriminated in the control unit, The mounting signal of the rear roll removing member is transmitted from the control section,
And the drive unit that has received the mounting signal drives the detachable device to contact the rear roll removing member with the rear roll attached with foreign matter forming the defect. The method according to claim 5 or 6,
Wherein a molded product of carbon or fine particles is used as said rear roll removing member. The method according to claim 5 or 6,
Wherein at least one molded article or fine particle selected from carbon, boron nitride, alkali alkaline earth metal sulfate, alkali alkaline earth carbonate, silica-based fine particles and alumina fine particles is used as the rear roll removing member.
KR1020147010799A 2011-10-28 2012-10-11 Method for cleaning rear roll, and glass plate production device KR101512607B1 (en)

Applications Claiming Priority (3)

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JPJP-P-2011-237646 2011-10-28
JP2011237646 2011-10-28
PCT/JP2012/076355 WO2013061793A1 (en) 2011-10-28 2012-10-11 Method for cleaning rear roll, and glass plate production device

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KR20140096032A true KR20140096032A (en) 2014-08-04
KR101512607B1 KR101512607B1 (en) 2015-04-15

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CN103906715A (en) 2014-07-02
TW201317189A (en) 2013-05-01
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CN103906715B (en) 2015-12-23
JPWO2013061793A1 (en) 2015-04-02

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