JPWO2013061793A1 - Rare roll cleaning method and glass plate manufacturing apparatus - Google Patents

Abstract

  According to the present invention, molten glass is poured onto a molten tin surface of a molten tin bath, and the molten glass is drawn from the molten tin bath to a lift-out region in a non-oxidizing atmosphere to form a glass ribbon, and the glass ribbon is lifted by a lift-out roll. When the glass plate is manufactured by transporting the glass ribbon from the lift-out region to the layered region under an oxygen atmosphere and transporting the glass ribbon with the layer roll provided in the layered region, the defect inspection of the surface of the glass plate is performed. The present invention relates to a method for cleaning a layer roll in which, when a defect is detected, a layer roll removing member is brought into contact with the layer roll to which foreign matter forming the defect is attached.

Description

  The present invention relates to a method for cleaning a rare roll and a glass plate manufacturing apparatus when a glass plate is manufactured by a float process.

  Many glass plates for architectural, automotive, and liquid crystal displays are manufactured by the float process. In the float method, molten glass is poured onto the molten tin surface of a molten tin bath (float bath), formed into a smooth and continuous sheet glass, and then drawn into a lift-out area to form a glass ribbon. This is a method for producing a glass plate by transporting to a temperature that can be cut while slowly cooling in the layer region, and cutting to a size that matches the purpose of use.

  In the production of the glass plate by the float method, the surface of the glass ribbon drawn out from the surface of the molten tin to the lift-out region, the molten tin, tin compound, the exfoliated material exfoliated from the roll surface, and foreign matter such as glass dust , Simply referred to as “foreign matter”). When the surface of the lift-out roll that transports the glass ribbon downstream contacts the surface of the glass ribbon to which foreign matter has adhered, if foreign matter has adhered to the lift-out roll surface, the foreign matter that has adhered to the lift-out roll surface is It contacts the glass ribbon surface conveyed to the downstream rare area, and reattaches to the glass ribbon surface, or forms a defect on the glass ribbon surface.

  Patent Document 1 proposes a technique for removing foreign substances adhering to the surface of a lift-out roll by using a carbon plate-shaped removal member. However, this technique has a problem in that a gap is formed between the lift-out roll and the removal member, so that the molten tin on the surface of the lift-out roll cannot be completely removed and the molten tin is reattached to the glass ribbon. Further, when the plate-shaped removing member is pressed against the lift-out roll in order to eliminate the gap, there is a problem that the lift-out roll vibrates and the glass ribbon surface is damaged.

In order to solve the above-mentioned problem, Patent Document 2 proposes a glass plate manufacturing apparatus (FIG. 6) using a heat-resistant fiber sheet as a member for removing foreign substances adhering to the lift-out roll surface.
The glass plate manufacturing apparatus 100 shown in FIG. 6 is divided into a float bath area S, a lift-out area T, and a rare area U. Further, the glass plate manufacturing apparatus 100 includes a glass melting portion (not shown) upstream of the float bath area S.

In the float bath area S, a molten tin bath 7 is provided. The float bath region S is maintained in a non-oxidizing atmosphere (reducing atmosphere or inert atmosphere) by supplying a purge gas such as nitrogen from a gas supply source (not shown). The molten tin bath 7 is filled with molten tin SN into which the molten glass G is poured.
The lift-out region T is maintained in a high temperature state (the melting point of tin is about 230 ° C.) in a non-oxidizing atmosphere as in the float bath region S. The lift-out area T is provided with a lift-out roll 22 that pulls out the molten glass G on the surface of the molten tin SN in the float bath area S and conveys 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 lift-out roll removing device 25 includes a lift-out roll removing member 24 that removes foreign matter adhering to the surface of the lift-out roll 22 and a support member 26 provided with the lift-out roll removing member 24. The lift-out-roll removing device 25 is provided so that the lift-out roll removing member 24 elastically contacts the lower part of the lift-out roll 22. Further, the lift-out roll removing member 24 is made of a heat-resistant fiber sheet, and for example, inorganic fibers such as carbon fibers, silica fibers, alumina fibers, silicon carbide fibers, and metal fibers are used.
The layered area U is maintained in an oxygen atmosphere. In the layer area U, a layer roll 42 for transporting the glass ribbon downstream is provided.

  According to the glass plate manufacturing apparatus 100, the foreign matter attached to the lift-out roll 22 is removed by the lift-out roll removing member 24 that is in contact with the lift-out roll 22. Further, the lift-out roll removing member 24 is in close contact with the lift-out roll without vibration. Thereby, formation of the defect in the glass ribbon GR surface and the glass plate GP is prevented.

  However, when a glass plate is manufactured using the glass plate manufacturing apparatus 100, it may not be removed in the lift-out region T, and foreign matter may remain on the surface of the glass ribbon GR up to the layer region U. Although the amount of foreign matter remaining up to the layer U is small, even if the glass plate to be manufactured requires extremely high quality, even a glass plate defect formed by a small amount of foreign matter is not allowed.

  Patent Document 2 suggests that the lift-out roll removing device 25 can be provided not only at an arbitrary position in the lift-out area T but also at an upstream portion of the layer area U into which the purge gas from the lift-out area T flows. Has been. However, the lower area U is maintained in an oxygen atmosphere as compared with the lift-out area T, and the removal member is gradually oxidized. As a countermeasure, 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 completely remove foreign matter adhering to the lift-out roll in the lift-out area T. The distance in the A direction of the lift-out area can also be extended. However, in both cases, in order to maintain a wide space in a non-oxidizing atmosphere, a large amount of purging gas is supplied to the heat-resistant fiber or the lift-out area, which increases the manufacturing cost of the glass plate. It was.

Japanese Unexamined Patent Publication No. 11-335127 Japanese Unexamined Patent Publication No. 2009-46366

  The present invention has been made in view of the above circumstances, and when producing a glass plate by the float process, foreign matter that remains on the lower surface of the glass ribbon without being removed in the lift-out region and adheres to the surface of the rare roll from the surface of the glass ribbon. The present invention provides a method for cleaning a rare roll and a glass plate manufacturing apparatus that can be removed at low cost and efficiency.

In order to achieve the above object, the present invention employs the following configuration.
That is, in the method for cleaning a rare roll according to the present invention, the molten glass is poured onto the molten tin surface of the molten tin bath, and the molten glass is drawn from the molten tin bath to a lift-out region under a non-oxidizing atmosphere to form a glass ribbon, When the glass ribbon is manufactured by transporting the glass ribbon from the lift-out area to the layered area under an oxygen atmosphere with a lift-out roll, and transporting the glass ribbon with the layer roll provided in the layered area, Inspection of defects on the glass plate surface,
When a defect is detected, a layered roll removing member is brought into contact with the layered roll to which foreign matter forming the defect is attached.

In addition, the method for cleaning a layer roll according to the present invention includes an attachment / detachment device having a drive unit and a drive unit on the removal member for the layer roll,
An inspection unit for detecting the presence or absence of defects on the surface of the glass plate in the layer area;
Determining a layered roll to which foreign matter forming the defect is attached, and providing a control unit for transmitting a mounting signal to the driving unit,
When the defect is detected by the inspection unit, by transmitting a defect detection signal from the inspection unit to the control unit, the control unit determines the rare roll to which the foreign matter forming the defect is attached, Sending the mounting signal of the removal member for the layer roll to the drive unit of the layer roll,
It is preferable that the attachment / detachment apparatus is driven by the driving unit that has received the mounting signal, and the layer roll removing member is brought into contact with the layer roll to which the foreign matter forming the defect is attached.

Furthermore, in the method for cleaning a rare roll according to the present invention, it is preferable to use a carbon compact or fine particles as the removal member for the rare roll.
In the method for cleaning a rare roll according to the present invention, the removal member for the rare roll is at least one selected from carbon, boron nitride, alkali / alkaline earth sulfate, alkali / alkaline earth carbonate, silica-based fine particles, and alumina fine particles. It is preferable to use two molded bodies or fine particles.

The glass plate manufacturing apparatus of the present invention includes a molten tin bath filled with molten tin,
Lift glass for drawing molten glass poured on the molten tin into a glass ribbon, and transporting the glass ribbon from a lift-out region under a non-oxidizing atmosphere to a layered region under an oxygen atmosphere;
In a glass plate manufacturing apparatus comprising a rare roll for conveying the glass ribbon in the rare area,
When a defect inspection is performed on the surface of the glass ribbon or the glass plate and a defect is detected, a layer roll removal member provided with an attachment / detachment device is applied to the layer roll to which foreign matter forming the defect is attached. It is configured to contact.

In addition, the glass plate manufacturing apparatus of the present invention is equipped with an attachment / detachment device having a drive part on the removing member for the layer roll,
An inspection unit for detecting the presence or absence of defects on the surface of the glass plate in the layer area;
Determining a layered roll to which foreign matter forming the defect is attached, and providing a control unit for transmitting a mounting signal to the driving unit,
The signal output end of the inspection unit is connected to the signal input end of the control unit, and the signal output end of the control unit is connected to the signal input end of the drive unit,
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 the control unit can determine the rare roll to which the foreign matter forming the defect is attached. In addition, a mounting signal for the removal member for the rear roll is transmitted from the control unit to the driving unit of the rear roll,
It is preferable that the attachment / detachment device is driven by the driving unit that has received the mounting signal, and the layering member for removing the layering roll is brought into contact with the layering roll to which foreign matter forming the defect is attached.

Furthermore, in the glass plate manufacturing apparatus of the present invention, it is preferable to use a carbon molded body or fine particles as the removing member for the layer roll.
Further, in the glass plate manufacturing apparatus of the present invention, the removal member for the rare roll is at least selected from carbon, boron nitride, alkali / alkaline earth sulfate, alkali / alkaline earth carbonate, silica-based fine particles, and alumina fine particles. It is preferable to use one molded body or fine particles.

  According to the above method, the layer roll removing member is attached to the layer roll to which the foreign matter forming the defect is attached only during the period when the defect of the glass ribbon conveyed to the layer area is detected. Thereby, abrasion of the removal member for a rare roll can be suppressed as much as possible. In addition, the time during which the removing member for the rare roll is exposed to the oxygen atmosphere can be minimized, and oxidation of the removing member for the rare roll can be prevented. Therefore, the replacement frequency of the removing member for the rare roll is low, and the rare roll can be cleaned efficiently and at low cost.

  Moreover, according to said method, immediately after detecting a defect in a test | inspection part, the rare roll to which the foreign material which has formed the defect adhered can be discriminate | determined by the control part, and the removal member for a rare roll can be mounted | worn with the discerned rare roll. As soon as no defect is detected by the inspection unit, the removal member for the layer roll can be removed from the identified layer roll. That is, the removal member for the layer roll can be attached to and detached from the layer roll depending on the presence or absence of defects on the surface of the glass ribbon.

  Furthermore, according to the above method, when the rear roll removing member is attached to the rear roll, carbon or boron nitride, alkali / alkaline earth sulfate, alkali / alkaline earth carbonate, A thin film of silica-based fine particles and alumina fine particles can be formed. As a result, the foreign matter adhering to the glass ribbon surface can be prevented from sticking to the surface of the rare roll.

  According to said structure, the foreign material which has formed the defect of the glass ribbon conveyed to the rare area and the cut | disconnected glass plate is reliably removed, and a high quality glass plate is manufactured. Further, it is possible to suppress wear of the removing member for the layer roll as much as possible. Furthermore, the time during which the removing member for the roll is exposed to the oxygen atmosphere can be minimized, and oxidation of the removing member for the roll can be prevented. Therefore, the replacement frequency of the removing member for the layer roll in the glass plate manufacturing apparatus can be lowered.

  Further, according to the above configuration, immediately after a defect is detected on the surface of the glass ribbon and the glass plate by the inspection unit, the layer roll to which the foreign matter forming the defect is attached is determined by the control unit. A removal member is attached. As soon as no defect is detected in the inspection section, the rear roll removing member is removed from the rear roll. That is, the removal member for the layer roll is attached to and detached from the layer roll depending on the presence or absence of defects on the surface of the glass ribbon.

  Furthermore, according to the above configuration, when the rear roll removing member is attached to the rear roll, carbon or boron nitride, alkali / alkaline earth sulfate, alkali / alkaline earth carbonate, A thin film of silica-based fine particles and alumina fine particles is formed. Due to the thin film, the foreign matter adhering to the surface of the glass ribbon can be prevented from adhering to the surface of the rare roll.

  ADVANTAGE OF THE INVENTION According to this invention, the cleaning method of the rare roll which removes the foreign material which remain | survived on the glass ribbon surface without removing in a lift-out area and adhered to the surface of the rare roll from this glass ribbon surface can be provided efficiently. . Moreover, the glass plate manufacturing apparatus which manufactures a glass plate without a defect on the surface can be provided. Furthermore, according to the present invention, an extremely high quality glass plate is provided.

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

  Hereinafter, embodiments to which the present invention is applied will be described with reference to the drawings.

(First embodiment)
The glass plate manufacturing apparatus 1 of this embodiment is divided into a float bath area S, a lift-out area T, and a rare area U as shown in FIG. Further, an unillustrated glass melting portion is provided upstream of the float bath area S. In the following description, the downstream refers to the same direction as the conveyance direction (A direction in FIG. 1) of the glass ribbon GR in FIG. 1, and the opposite direction side is defined as the upstream. Between the float bath area S and the lift-out area T, and between the lift-out area T and the rare area U are each divided by a partition provided with a gap capable of conveying the glass ribbon.

The float bath area 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 a purge gas for removing oxygen is always supplied into the float bath area S. This is for preventing oxidation of the molten tin SN and keeping the float bath area S in a non-oxidizing atmosphere. The purge gas is preferably nitrogen gas, argon gas, or hydrogen-containing nitrogen gas. A part of the purge gas supplied into the float bath area S flows in the direction P1 in FIG.

  A gas supply source (not shown) is provided in the lift-out area T, and a purge gas is always supplied as in the float bath area S, and the lift-out area T is maintained in a non-oxidizing atmosphere. A part of the purge gas supplied into the lift-out area T flows in the direction P2 in FIG.

  In the lift-out area T, a plurality of lift-out rolls 22 are provided at higher positions in the downstream in order to convey the glass ribbon GR while lifting it. The number of lift-out rolls 22 is determined according to the diameter RT of the lift-out roll 22 and the distance in the A direction of the lift-out area T. If the distance LT in the A direction of the lift-out area T is too short, the glass ribbon may be transported to the layer area U with a large amount of foreign matter on the surface of the glass ribbon attached. On the contrary, if the distance in the A direction of the lift-out area T is too long, the supply amount of the purge gas becomes enormous and the manufacturing cost of the glass plate may be extremely high. In consideration of these situations, it is preferable that the number of lift-out rolls 22 is 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 paper surface of FIG. 1). As shown in FIGS. 2A and 2B, the lift-out roll removing device 25 includes a lift-out roll removing member 24 and a support member 26 that supports the lift-out roll removing member 24. Consists of The height and width of the lift-out roll removing member 24 and the support member 26 are preferably determined so that the lift-out roll removing member 24 contacts the lower part of the lift-out roll 22. The lift-out roll removing device 25 may be composed of a combination of a plurality of lift-out roll removing members 24 and a support member 26.

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

  As shown in FIG. 2A, the support member 26 has a rectangular parallelepiped shape that supports the lift-out roll removing member 24. As shown in FIG. 2B, a cutout 27 into which the lift-out roll removing member 24 is fitted is provided on the upper surface of the support member 26. In the center of the cutout 27, a concave portion 27 'for fixing the position of the liftout roll removing member 24 is provided. The width and depth of the cutout 27 and the recess 27 ′ are preferably determined in consideration of the size of the lift-out roll removing member 24. Further, as shown in FIG. 2C, a gas path 29 is provided in the support member 26, and a non-oxidizing gas is supplied from the inner surface of the lift-out roll removing member 24 through a gas path 29 from a gas supply source (not shown). More preferably.

Although the rare region U is in an oxidizing atmosphere, the purge gas from the lift-out region T flows from the P2 direction into the upstream portion very close to the lift-out region T, and the oxidizing property is weakened.
In the layered area U, a plurality of layered rolls 42 are provided for gradually cooling the glass ribbon GR by transporting a long distance horizontally. The distance in the A direction of the rare area U is much longer than the distance in the A direction of the lift out area T, and can be determined in consideration of the distance at which the glass ribbon GR in the high temperature state in the upstream area of the rare area U can be gradually cooled. That's fine. Further, the number of the layered rolls 42 is determined according to the diameter RU of the layered roll 42 and the distance LU in the A direction of the layered area U.

  The upstream layer roll 42 is provided with a layer roll removing device 45 in the width direction of the layer roll 42 (in the direction perpendicular to the sheet of FIG. 1). The number of the rear rolls 42 provided with the rear roll removing device 45 is determined from the necessary number of the rear rolls 42 that can completely remove the foreign matter adhering to the surface of the glass ribbon GR conveyed to the rear area U, and the lift-out area T. It is preferable to determine the range in which the purge gas flows.

  As shown in FIGS. 2 (a) and 2 (b), the rear roll removing device 45 includes a rear roll removing member 44 and a support member 46 that supports the member. The heights of the rear roll removing member 44 and the support member 46 are preferably determined so that the rear roll removing member 44 contacts the lower portion of the rare 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 support member 46.

  The rare roll removing member 44 is made of a material that forms a thin film on the surface of the rare roll 42 and is suitable for removing foreign matters including tin oxide adhered to the glass ribbon GR surface by the thin film and has a low scratching force on the glass. Molded bodies or fine particles are used. Specific examples include at least one molded body or fine particle selected from carbon, boron nitride, alkali / alkaline earth sulfate, alkali / alkaline earth carbonate, silica-based fine particles, and alumina fine particles. Specifically, the carbon molded body preferably has a Shore hardness of about 20 to 70 HS, and is suitable for the removal of foreign matters including tin oxide having a strong adhesive force. . Further, the boron nitride molded body preferably has a purity of 30% or more.

  As shown in FIG. 2A, the support member 46 has a rectangular parallelepiped shape that supports the rear roll removing member 44. As shown in FIG. 2B, a cutout 47 into which the rear roll removing member 44 is fitted is provided on the upper surface of the support member 46. In the center of the cutout 47, a recess 47 ′ is provided for fixing the rear roll removing member 44 so as not to be detached from the support member 46. The width and depth of the cutout 47 and the recess 47 'are preferably determined in consideration of the size of the rear roll removing member 44. Further, as shown in FIG. 2 (c), a gas path 49 is provided in the support member 46, and a non-oxidizing property is provided on the surface of the removing member 44 for the rare roll through a gas path 49 from a non-oxidizing gas supply source (not shown). More preferably, gas is supplied. Furthermore, as shown in FIG. 2D, it is more preferable that the support member 46 is provided with a moving mechanism 48 that makes it easy to attach and detach the rear roll removing device 45 to the rear roll 42.

  Moreover, it is preferable that the removal apparatus 45 for a roll is provided with the attachment / detachment apparatus 50 as shown to Fig.3 (a). The distal end portion 50 x of the attachment / detachment device 50 is joined to the end surface 46 c of the support member 46. The attachment / detachment device 50 may be moved manually or driven by a moving mechanism (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 about the same as w42 in terms of cost. If the removing member 44 for the layer roll is within the range of the both end faces 42a and 42c of the layer roll 42, it comes into contact with the layer roll 42 (becomes attached). When the rear roll removing member 44 moves in the direction B or C in FIG. 3A and both end surfaces 44a and 44c of the rear roll removing member 44 are outside the rear roll 42 with respect to 42c and 42a, respectively, the rear roll removing member 44 is removed. The member 44 is removed from the layer roll 42 (detached state). It is preferable that the rear roll removing member 44 is stored in a non-oxidizing atmosphere when the rear roll removing member 44 is detached from the rear roll 42.

  As shown in FIG. 3B, the support member 46 of the rear roll removing device 45 may extend from both end faces 42 a and 42 c of the rear roll 42. In that case, the rear roll removing device 45 may be configured so that only the rear roll removing member 44 is movable, and the support member 46 may be fixed. When the detaching device 50 is provided in the rear roll removing device 45, the distal end portion 50 x of the detaching device 50 is joined to the end surface 44 c of the rear roll removing member 44.

Next, a method for cleaning a layer roll and a method for manufacturing a glass plate in the glass plate manufacturing apparatus 1 will be described with reference to FIG.
The molten glass G produced in the glass melting part is poured into the molten tin SN of the molten tin bath 7 in the float bath area S. Since tin is a metal whose specific gravity is heavier than glass, the molten glass G flows downstream while floating on the molten tin SN liquid surface.

  Downstream of the molten tin bath 7, the molten glass G formed into a plate shape is pulled up onto the liftout roll 22 in the liftout area T. The pulled molten glass G becomes a glass ribbon GR. A large amount of molten tin SN adheres to the surface of the glass ribbon GR. A lift-out roll removing member 24 is brought into contact with the surface of the lift-out roll 22, whereby a thin film of a substance constituting the lift-out roll removing member 24 is formed. While the molten tin SN adhered to the glass ribbon GR is conveyed downstream by the lift-out roll 22, the thin film formed on the surface of the lift-out roll 22 prevents the adhesion to the lift-out roll surface. The Further, as the lift-out roll 22 rotates, the molten tin SN attached to the thin film adheres to the lift-out roll removing member 24. Thus, the molten tin SN adhering to the glass ribbon GR surface is removed.

The glass ribbon GR is conveyed from the lift-out area T to the rare area U. The glass ribbon GR is gradually cooled while being conveyed by the layer roll 42 in the layer region U, and is cut to a target size by a cutting machine (not shown) provided on the downstream side of the layer region U.
On the downstream side of the layer area U, the presence of defects on the surface of the glass ribbon GR or the glass plate GP is inspected. The defect inspection may be performed before or after cutting the glass ribbon GR.
In the lift-out region T, when the molten tin SN on the surface of the glass ribbon GR is completely removed, no defect is formed on the glass plate GP. And the cut | disconnected glass plate GP is conveyed to the apparatus which performs processing, such as finishing of the glass plate GP provided in the further downstream side of the rare area U. FIG. The allowable range of defects in the defect inspection is set according to the purpose of use and the standard of the glass plate.

  In the lift-out area T, when the molten tin SN remains on the surface of the glass ribbon GR and is transported to the layer area U under an oxidizing atmosphere, the molten tin SN is oxidized to become tin oxide. Foreign matter containing tin oxide forms scratches and defects on the surface of the glass ribbon GR.

  When a defect is detected on the surface of the glass ribbon GR by the defect inspection, the layer roll 42 on which the foreign matter has adhered to the surface is specified from the condition such as the defect inspection position, the defect detection time, the distance to each layer roll 42 and the like. The layer roll removal member 44 of the identified layer roll 42 is moved by the attachment / detachment device 50 so as to be attached to the layer roll 42.

  A thin film of a material constituting the layer removing member 44 is formed on the surface of the layer roll 42. Due to the thin film, the foreign matter adhering to the surface of the rare roll 42 is prevented from being oxidized or adhered to the surface of the rare roll 42. When the foreign member adhering to the specified surface of the rare roll 42 is removed from the surface of the glass ribbon GR by the layer roll removing member 44, no defect is formed on the surface of the glass ribbon GR conveyed downstream of the rare region U. In the defect inspection, when the defect is no longer detected from the surface of the glass ribbon GR or the glass plate GP, the removing device 45 for the rear roll 42 of the identified layer roll 42 is moved by the attaching / detaching device 50 so as to be in the detached state.

  According to the glass plate manufacturing apparatus 1, the rare roll removing device 45 can be used during normal operation, but is attached to the rare roll 42 only when foreign matter on the surface of the glass ribbon GR adheres to the surface of the rare roll 42. Is possible. As a result, the wear of the removal member 44 for the rare roll or the oxidation in the oxygen atmosphere is minimized, and the replacement frequency of the removal member 44 for the rare roll can be reduced. Therefore, the foreign matter on the surface of the glass ribbon GR or the glass plate GP is surely removed at an efficient and low cost, and a high-quality glass plate is manufactured.

(Second Embodiment)
Below, the glass plate manufacturing apparatus 2 of 2nd Embodiment to which this invention is applied is demonstrated 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.

  In addition to the components of the glass plate manufacturing apparatus 1 in FIG. 1, the glass plate manufacturing apparatus 2 in FIG. 4 detects an existence of defects on the surface of the glass ribbon GR or the glass plate GP downstream of the layer area U. 60, and a control unit 61 that transmits a signal to the attachment / detachment device 50 and the determination of the layer roll 42 related to defect formation. In addition, the attaching / detaching device 50 of each of the layer roll removing devices 45 is provided with a drive unit 62. The signal output end of the inspection unit 60 is connected to the signal input end of the control unit 61, and the signal output end of the control unit 61 is connected to the drive unit 62 of the attachment / detachment device 50 of each rear roll removing device 45.

  As shown in FIG. 5, in addition to the configuration of the rear roll removing device 45 in FIG. 3, the rear roll removing device 45 has a drive unit 62 at the other end of the end portion 50x of the attaching / detaching device 50. Is provided. The drive unit 62 has a function of operating the attachment / detachment 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. Also in the layer roll removing device 45 of the glass plate manufacturing apparatus 2, the support member 46 may extend from both end faces 42 a and 42 c of the layer roll 42, similarly to the layer roll removing device 45 of FIG.

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

  When the inspection unit 60 detects a defect on the surface of the glass ribbon GR or the glass plate GP, a defect detection signal is transmitted from the inspection unit 60 to the control unit 61. The control unit 61 that has received the defect detection signal records in advance data such as the diameter RU of each layer roll 42, the distance LU in the A direction of the layer region U, the distance between each layer roll 42 and the inspection unit 60, and the defect detection time. Based on the above, the rare roll 42 to which the foreign matter forming the defect is attached is specified. The control unit 61 sends a mounting signal for the rear roll removing member 44 to the drive unit 62 of the identified rear roll 42. The drive unit 62 that has received the mounting signal activates the attachment / detachment device 50 to place the identified rear roll removal member 44 of the rear roll 42 in the mounted state. The foreign matter adhering to the identified surface of the layer roll 42 is removed by the mounted layer roll removing member 44.

  When 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 that has received the defect removal signal transmits a removal signal to the drive unit 62 of the identified layer roll 42. The drive unit 62 that has received the removal signal operates the attachment / detachment device 50 to remove the layer roll removal member 44 from the identified layer roll 42.

  According to the method for cleaning a layer roll using the glass plate manufacturing apparatus 2 and the method for manufacturing a glass plate, only when a defect of the glass ribbon GR is detected by the inspection unit 60, A removal member for the layer roll can be attached.

Although the present invention has been described in detail and with reference to specific embodiments, it will be apparent to those skilled in the art that various modifications and variations can be made without departing from the scope and spirit of the invention.
This application is based on the JP Patent application 2011-237646 of an application on October 28, 2011, The content is taken in here as a reference.

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

Claims (8)

The molten glass is poured onto the molten tin surface of the molten tin bath, and the molten glass is drawn from the molten tin bath to a lift-out area under a non-oxidizing atmosphere to form a glass ribbon, and the glass ribbon is lifted out by a lift-out roll. When the glass plate is manufactured by transporting the glass ribbon by transporting the glass ribbon with the layer roll provided in the layered region, the defect inspection of the surface of the glass plate is performed.
A cleaning method for a layer roll, wherein when a defect is detected, a layer roll removing member is brought into contact with the layer roll to which foreign matter forming the defect is attached. Attaching an attachment / detachment device having a drive part to the removing member for the layer roll,
An inspection unit for detecting the presence or absence of defects on the surface of the glass plate in the layer area;
Determining a layered roll to which foreign matter forming the defect is attached, and providing a control unit for transmitting a mounting signal to the driving unit,
When the defect is detected by the inspection unit, by transmitting a defect detection signal from the inspection unit to the control unit, the control unit determines the rare roll to which the foreign matter forming the defect is attached, Sending the mounting signal of the removal member for the layer roll to the drive unit of the layer roll,
2. The method of cleaning a layer roll according to claim 1, wherein the attachment / detachment device is driven by the driving unit that has received the mounting signal, and the layer roll removing member is brought into contact with the layer roll to which the foreign matter forming the defect is attached.   The method for cleaning a rare roll according to claim 1 or 2, wherein a carbon molded body or fine particles are used as the removal member for the rare roll.   The at least one compact or fine particle selected from carbon, boron nitride, alkali / alkaline earth sulfate, alkali / alkaline earth carbonate, silica-based fine particles, and alumina fine particles is used as the removing member for the rare roll. 3. A method for cleaning a rare roll according to 2. A molten tin bath filled with molten tin;
Lift glass for drawing molten glass poured on the molten tin into a glass ribbon, and transporting the glass ribbon from a lift-out region under a non-oxidizing atmosphere to a layered region under an oxygen atmosphere;
In a glass plate manufacturing apparatus comprising a rare roll for conveying the glass ribbon in the rare area,
When a defect inspection is performed on the surface of the glass ribbon or the glass plate and a defect is detected, a layer roll removal member provided with an attachment / detachment device is applied to the layer roll to which foreign matter forming the defect is attached. The glass plate manufacturing apparatus comprised so that it may contact. Attaching an attachment / detachment device having a drive part to the removing member for the layer roll,
An inspection unit for detecting the presence or absence of defects on the surface of the glass plate in the layer area;
Determining a layered roll to which foreign matter forming the defect is attached, and providing a control unit for transmitting a mounting signal to the driving unit,
The signal output end of the inspection unit is connected to the signal input end of the control unit, and the signal output end of the control unit is connected to the signal input end of the drive unit,
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 the control unit can determine the rare roll to which the foreign matter forming the defect is attached. In addition, a mounting signal for the removal member for the rear roll is transmitted from the control unit to the driving unit of the rear roll,
6. The apparatus according to claim 5, wherein the attachment / detachment device is driven by the drive unit that has received the mounting signal, and the removal member for the layer roll is brought into contact with the layer roll to which the foreign matter forming the defect is attached. The glass plate manufacturing apparatus of description.   The glass plate manufacturing apparatus according to claim 5 or 6, wherein a carbon molded body or fine particles are used as the removing member for the rare roll.   The at least one molded body or fine particle selected from carbon, boron nitride, alkali / alkaline earth sulfate, alkali / alkaline earth carbonate, silica-based fine particles, and alumina fine particles is used as the removal member for the rare roll. 6. The glass plate manufacturing apparatus according to 6.

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