KR102002655B1 - Support roll, molding deⅵce for plate glass haⅵng support roll, and molding method for plate glass using support roll - Google Patents

Support roll, molding deⅵce for plate glass haⅵng support roll, and molding method for plate glass using support roll Download PDF

Info

Publication number
KR102002655B1
KR102002655B1 KR1020147007121A KR20147007121A KR102002655B1 KR 102002655 B1 KR102002655 B1 KR 102002655B1 KR 1020147007121 A KR1020147007121 A KR 1020147007121A KR 20147007121 A KR20147007121 A KR 20147007121A KR 102002655 B1 KR102002655 B1 KR 102002655B1
Authority
KR
South Korea
Prior art keywords
molten glass
glass ribbon
support roll
mass
rotary member
Prior art date
Application number
KR1020147007121A
Other languages
Korean (ko)
Other versions
KR20140098736A (en
Inventor
나루아키 도미타
Original Assignee
에이지씨 가부시키가이샤
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 에이지씨 가부시키가이샤 filed Critical 에이지씨 가부시키가이샤
Publication of KR20140098736A publication Critical patent/KR20140098736A/en
Application granted granted Critical
Publication of KR102002655B1 publication Critical patent/KR102002655B1/en

Links

Images

Classifications

    • 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
    • C03B18/04—Changing or regulating the dimensions of the molten glass ribbon
    • C03B18/06—Changing or regulating the dimensions of the molten glass ribbon using mechanical means, e.g. restrictor bars, edge rollers
    • 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
    • C03B18/22—Controlling or regulating the temperature of the atmosphere above the float tank
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B17/00—Forming molten glass by flowing-out, pushing-out, extruding or drawing downwardly or laterally from forming slits or by overflowing over lips
    • C03B17/06—Forming glass sheets
    • C03B17/064—Forming glass sheets by the overflow downdraw fusion process; Isopipes therefor

Abstract

The support roll 40 used for suppressing the shrinkage in the width direction (Y direction) of the molten glass ribbon G in strip form has a rotary member 50 in contact with the molten glass ribbon G at its front end, (50) does not have a refrigerant passage therein but is formed of ceramics.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate glass forming apparatus having a support roll and a support roll, and a method of forming a plate glass using the support roll,

The present invention relates to a support roll, a molding apparatus for a plate glass having a support roll, and a molding method of the plate glass using the support roll.

BACKGROUND ART As a method of forming a plate glass, a float method is widely used. The float method is a method in which a molten glass introduced on a molten metal (for example, molten tin) accommodated in a bath is flowed in a predetermined direction to obtain a molten glass ribbon in the shape of a strip. After the molten glass ribbon is cooled in the process of flowing in the horizontal direction, the molten glass ribbon is pulled up from the molten metal by the lift-out roll, and slowly cooled in the slow-annealing furnace to become plate-like glass. The plate-like glass is taken out from the annealing furnace and then cut into a predetermined dimension by a cutting machine to obtain a plate glass as a product.

As another molding method, a fusion method is also known. In the fusion method, the molten glass that flows over the upper and lower sides of both left and right sides of the gutter-like member is lowered along both left and right side surfaces of the gutter-shaped member, and the molten glass ribbon is combined with the lower frame Method. The molten glass ribbon is slowly cooled while moving downward in the vertical direction to become a plate-like glass. The plate-like glass is cut into a predetermined dimension by a cutter to form a plate glass as a product.

However, the molten glass ribbon which is thinner than the equilibrium thickness tries to shrink in the width direction. If the molten glass ribbon shrinks in the width direction, the thickness of the plate glass as a product becomes thicker than the target thickness. This problem is more pronounced as the thickness of the target becomes thinner.

Therefore, conventionally, in order to suppress the shrinkage in the width direction of the molten glass ribbon, a support roll for supporting the molten glass ribbon is used (see, for example, Patent Document 1). A plurality of support rolls are arranged on both sides in the width direction of the molten glass ribbon, and tension is applied to the molten glass ribbon in the width direction. The support roll has a rotating member at its tip end that makes contact with the surface of the molten glass ribbon. As the rotary member rotates, the molten glass ribbon is fed out in a predetermined direction.

The rotary member of the support roll is formed in a disc shape by a metal material such as steel or a heat resistant alloy, and a chromium plating layer or the like may be applied to a portion of the rotary member in contact with the molten glass ribbon. The rotating member has a gear-shaped concavity and convexity at the outer peripheral portion contacting with the molten glass ribbon so as to easily support the molten glass ribbon.

Japanese Patent Application Laid-Open No. 2008-239370

However, since the rotary member of the support roll is formed of a metal material, it has a refrigerant passage therein so as not to be overheated by contact with the molten glass ribbon. Since the coolant flows inside the rotating member, the molten glass ribbon is strongly cooled in the vicinity of the rotating member. Therefore, the temperature of the molten glass ribbon, and hence the thickness of the molten glass ribbon, is liable to become unstable, and the flatness of the plate glass as a product may be impaired.

Further, since the molten glass ribbon is strongly cooled and hardened in the vicinity of the rotating member, the rotating member is difficult to dig into the molten glass ribbon, and the molten glass ribbon can not be supported (gripped) in some cases. Particularly, since the temperature of the molten glass ribbon on the downstream side in the direction of movement of the molten glass ribbon is low, gripability tends to become a problem.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a support roll capable of improving the flatness of the plate glass and the gripability of the molten glass ribbon.

According to an aspect of the present invention, there is provided a support roll used for suppressing shrinkage in a width direction of a molten glass ribbon in the form of a strip, wherein a rotary member in contact with the molten glass ribbon is provided at a tip end And the rotary member is provided with a support roll formed of ceramics without having a refrigerant passage therein.

According to the present invention, it is possible to provide a support roll capable of improving flatness of the plate glass and gripability of the molten glass ribbon.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a partial cross-sectional view showing a sheet glass forming apparatus according to an embodiment of the present invention; Fig.
2 is a cross-sectional view taken along the line II-II in Fig.
3 is a front view showing a support roll according to an embodiment of the present invention.
4 is a partial cross-sectional view taken along the line IV-IV in Fig.
5 is a front view showing a modified example (1) of the rotating member.
6 is a sectional view taken along the line VI-VI in Fig.
7 is a front view showing a modified example (2) of the rotating member.
8 is a front view showing a modified example (3) of the rotating member.
9 is a front view showing a modified example (4) of the rotating member.
10 is a front view showing a modified example (5) of the rotating member.
11 is a graph showing the temporal change of the wettability of the sintered body with respect to the molten glass in Examples 1 to 4;

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. In the following drawings, the same or corresponding components are denoted by the same or corresponding reference numerals, and a description thereof will be omitted.

(Sheet glass forming apparatus and forming method)

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a partial cross-sectional view showing a sheet glass forming apparatus according to an embodiment of the present invention; Fig. 2 is a cross-sectional view taken along the line II-II in Fig.

The molding apparatus 10 of the plate glass has a float bath 20. The float bath 20 is connected to a bath 22 containing a molten metal S (for example, molten tin) S, a side wall 24 provided along the outer circumference upper edge of the bath 22 and the side wall 24, A ceiling 26 covering the upper part of the bathtub 22, and the like. The ceiling 26 is provided with a gas supply path 30 for supplying a reducing gas to a space 28 formed between the bathtub 22 and the ceiling 26. [ A heater 32 as a heating source is inserted in the gas supply path 30 and a heat generating portion 32a of the heater 32 is disposed above the bathtub 22. [

The molding method using the molding apparatus 10 is a method in which molten glass introduced on a molten metal (for example, molten tin) S is flowed in a predetermined direction to obtain molten glass ribbon G in the shape of a strip. After the molten glass ribbon G is cooled in the process of flowing in a predetermined direction (X direction in FIG. 2), the molten glass ribbon G is pulled up from the molten tin S by a lift-out roll and slowly cooled in a gradual cooling furnace to become a plate-like glass. The plate-like glass is taken out from the annealing furnace and then cut into a predetermined dimension by a cutting machine to obtain a plate glass as a product.

The space 28 in the float bath 20 is filled with a reducing gas supplied from the gas supply path 30 in order to prevent oxidation of the molten tin S. [ The reducing gas includes, for example, 1 to 15% by volume of hydrogen gas and 85 to 99% by volume of nitrogen gas. The space 28 in the float bath 20 is set to a pressure higher than the atmospheric pressure in order to prevent the atmosphere from being mixed in from the gap of the side wall 24 or the like.

A plurality of heaters 32 are provided at intervals in the flow direction (X direction) and the width direction (Y direction) of the molten glass ribbon G to adjust the temperature distribution in the float bath 20, Respectively. The output of the heater 32 is controlled so that the temperature of the molten glass ribbon G becomes higher as it is upstream in the flow direction (X direction) of the molten glass ribbon G. Further, the output of the heater 32 is controlled so that the temperature of the molten glass ribbon G becomes uniform in the width direction (Y direction).

The plate glass forming apparatus 10 also has a support roll 40 for supporting the molten glass ribbon G in order to restrain the molten glass ribbon G in the float bath 20 from contracting in the width direction. As shown in Fig. 2, a plurality of support rolls 40 are arranged on both sides in the width direction of the molten glass ribbon G, and tension is applied to the molten glass ribbon G in the width direction (Y direction in the drawing).

The support roll (40) has a rotary member (50) at its tip end to be in contact with the molten glass ribbon (G). The rotary member 50 supports the end portion in the width direction of the molten glass ribbon G so that the molten glass ribbon G does not contract in the width direction by being pinched or brought into contact with the upper surface of the molten glass ribbon G. As the rotary member 50 rotates, the molten glass ribbon G is fed in a predetermined direction.

(Supporting roll)

3 is a front view showing a support roll according to an embodiment of the present invention. 4 is a partial cross-sectional view taken along the line IV-IV in Fig.

The support roll 40 mainly comprises a rotary member 50, a mounting member 60 on which the rotary member 50 is mounted and a shaft member 70 integrated with the mounting member 60. [ The shaft member 70, the mounting member 60, and the rotary member 50 are arranged in this order in the order of the explanation. However, the rotary member 50, the mounting member 60, Explain.

(Shaft member)

The shaft member 70 may have a refrigerant passage therein, be cooled by the refrigerant flowing through the refrigerant passage, and may be formed of a metal material such as a steel or a heat resistant alloy. A heat insulating material (not shown) may be wound around the outer periphery of the shaft member 70.

The shaft member 70 is, for example, a double pipe, and is composed of an inner pipe and an outer pipe. The refrigerant passage is constituted by an inner space of the inner tube and a space formed between the outer peripheral surface of the inner tube and the inner peripheral surface of the outer tube.

As the refrigerant, a liquid such as water or a gas such as air is used. The refrigerant is supplied to the inner space of the installation member 60 through the inner space of the inner tube, for example, and then discharged to the outside through the space formed between the outer circumferential surface of the inner tube and the inner circumferential surface of the outer tube. The refrigerant discharged to the outside may be cooled by the cooler and then returned to the inner space of the inner tube again. The flow direction of the refrigerant may be reversed.

1, the shaft member 70 passes through the side wall 24 and is connected to a drive unit 34 constituted by a motor, a speed reducer, and the like, outside the float bath 20 . The shaft member 70, the attachment member 60 and the rotary member 50 are integrally rotated about the center axis of the shaft member 70 by operating the drive device 34. [

(Mounting member)

The mounting member 60 may be integrated with the shaft member 70 and may have an inner space (not shown) communicating with the refrigerant passage of the shaft member 70, as shown in Fig. Since the refrigerant flows into the inner space, the mounting member 60 may be formed of a metal material such as steel or a heat resistant alloy. The rotary member (50) is removably mounted on the mounting member (60).

The mounting member 60 includes a shaft portion 62 integrated with the shaft member 70 and an annular flange portion 63 protruding outward in the radial direction of the shaft portion 62 from the distal end portion of the shaft portion 62 And a rod portion 64 extending coaxially with the shaft portion 62 from the distal end portion of the shaft portion 62. [

The shaft portion 62 abuts against the shaft member 70 and is integrated by, for example, welding. A not-shown refrigerant passage communicating with the refrigerant passage of the shaft member 70 may be formed in the shaft portion 62.

The flange portion 63 protrudes outward in the radial direction of the shaft portion 62 from the distal end portion of the shaft portion 62 (end portion opposite to the shaft member 70). The flange portion 63 may be provided with a refrigerant flow path (not shown) communicating with the refrigerant flow path of the shaft member 70. [

The rod portion 64 extends coaxially with the shaft portion 62 from the distal end portion of the shaft portion 62. The load section 64 may be provided with a refrigerant flow path (not shown) communicating with the refrigerant flow path of the shaft member 70. As shown in Fig. 4, the rod portion 64 passes through the rotary member 50, and has a male screw portion at its distal end portion. The movement of the rotary member 50 in the axial direction is restricted by the nut 41 and the flange portion 63 that are screwed to the male screw portion. By removing the nut 41 from the male screw portion, the rotary member 50 can be removed.

The mounting member 60 has shaft portions 67 and 68 fixed to the front end side surface of the flange portion 63 and parallel to the central axial line of the rod portion 64. The mounting member 60 and the rotary member 50 can be integrally rotated by the shaft portions 67 and 68 and the rod portion 64. [

Each of the shaft portions 67 and 68 passes through the rotary member 50 as shown in Fig. 4, and has a male screw portion at its tip end. The movement of the rotary member 50 in the axial direction is restricted by the nuts 42 and 43 and the flange portion 63 that are screwed to the male screw portion. By removing the nuts 42 and 43 from the male screw portion, the rotary member 50 can be removed.

(Rotating member)

The center of rotation of the rotary member 50 and the central axis of the shaft member 70 are on the same straight line. The rotating member 50 is in contact with the surface (the upper surface in the present embodiment) of the molten glass ribbon G at the outer peripheral portion 51. As the rotary member 50 rotates, the molten glass ribbon G is fed in a predetermined direction.

As shown in Fig. 3, for example, the rotary member 50 has gear-like projections and depressions 52 in the outer peripheral portion 51. [ The concave and convex portions 52 make it easier for the rotary member 50 to pierce into the molten glass ribbon G. The convex portion 52a of the concavity and convexity 52 is not particularly limited, but may be formed in a tapered shape (for example, a tetragonal shape) as shown in Fig. As shown in Fig. 4, the gear-shaped protrusions 52 are formed in a row on the outer peripheral portion 51 of the rotary member 50, but may be formed in a plurality of rows.

The rotary member 50 does not have a refrigerant passage therein but is formed of ceramics. Since ceramics have higher high-temperature strength than metals such as conventional steels and heat-resistant alloys, the refrigerant flow path, which has heretofore been required, becomes unnecessary. Therefore, since the coolant does not flow inside the rotary member 50, the molten glass ribbon G is hardly cooled strongly in the vicinity of the rotary member 50. As a result, the temperature of the molten glass ribbon G, and furthermore, the thickness of the molten glass ribbon G are stabilized, so that the flatness of the plate glass as a product is improved. In addition, since the molten glass ribbon G is hardly hardly cooled and hardly hardened in the vicinity of the rotating member 50, the rotating member 50 is easy to pierce into the molten glass ribbon G, and the molten glass ribbon G of the rotating member 50 The gripping property to the ribbon G is improved. This effect is conspicuous on the downstream side in the flow direction in which the temperature of the molten glass ribbon G is lowered.

The ceramics are not particularly limited, but silicon carbide (SiC) ceramics, silicon nitride (Si 3 N 4 ) ceramics, and the like are used. Silicon carbide or silicon nitride has a high resistance to steam of molten tin S or molten tin S, and is excellent in high-temperature strength and creep characteristics.

The type of the ceramics is selected according to the type of the plate glass (that is, the molten glass ribbon G). For example, when the plate glass is an alkali-free glass, a silicon nitride-based ceramics excellent in thermal shock resistance is suitable. In the case of alkali-free glass, since the temperature in the float bath 20 tends to be high, the degree of freedom of the operation is increased when the thermal shock resistance is high. Further, the higher the temperature, the more likely the reactivity with the molten glass ribbon G or the molten tin S becomes a problem, but the silicon nitride ceramics tends to have lower reactivity. When the type of the plate glass is soda lime glass, in addition to silicon nitride ceramics, silicon carbide-based ceramics or alumina-based ceramics can be used.

The alkali-free glass is a glass substantially free of alkali metal oxides (Na 2 O, K 2 O, Li 2 O). The total amount (Na 2 O + K 2 O + Li 2 O) of the content of the alkali metal oxide in the alkali-free glass may be, for example, not more than 0.1%.

The alkali-free glass can be produced, for example, from 50 to 70%, preferably 50 to 66%, Al 2 O 3 : 10.5 to 24%, B 2 O 3 : 0 to 12%, SiO 2 : 0 to 10%, preferably 0 to 8% of MgO, 0 to 14.5% of CaO, 0 to 24% of SrO, 0 to 13.5% of BaO and 0 to 5% of ZrO 2 , + SrO + BaO: 8 to 29.5%, preferably 9 to 29.5%.

When the solubility is taken into consideration, the alkali-free glass preferably has a mass percent based on the oxide as expressed by percentage of SiO 2 : 58 to 66%, Al 2 O 3 : 15 to 22%, B 2 O 3 : 12 to 12%, MgO: 0 to 8%, CaO: 0 to 9%, SrO: 3 to 12.5% and BaO: 0 to 2%, and MgO + CaO + SrO + BaO: 9 to 18% .

The alkali-free glass is preferably an oxide-based mass percentage indication when considering a high distortion point, and is composed of SiO 2 : 54 to 73%, Al 2 O 3 : 10.5 to 22.5%, B 2 O 3 : 0 to 5.5 0 to 10% of MgO, 0 to 9% of CaO, 0 to 16% of SrO, 0 to 2.5% of BaO and 8 to 26% of MgO + CaO + SrO + BaO.

In the case where the kind of the plate glass is an alkali-free glass, at least a portion of the rotary member 50 which contacts the molten glass ribbon G may be silicon nitride ceramics, and the entire rotary member 50 may not be silicon nitride ceramics. For example, a layer of silicon nitride ceramics may be formed on a substrate containing metal, carbon or other ceramics by film formation, joining, or fitting. As described above, different kinds of ceramics may be used for each part of the rotary member 50. [ In the present embodiment, the entire rotary member 50 is formed of silicon nitride ceramics.

The silicon nitride ceramics may be a sintered body obtained by sintering a formed body made of a mixed powder containing a powder of silicon nitride and a powder of a sintering aid. Examples of the sintering method include an atmospheric pressure sintering method, a pressure sintering method (including hot press sintering and gas pressure sintering), and the like. As the sintering aid, at least one selected from alumina (Al 2 O 3 ), magnesia (MgO), titania (TiO 2 ), zirconia (ZrO 2 ) and yttria (Y 2 O 3 ) is used.

The silicon nitride ceramics preferably has a content of aluminum (Al) of 0.1 mass% or less, preferably 1 mass% or less, a content of magnesium (Mg) of 0.7 mass% or less, preferably 0.7 mass% or less, The content is preferably 0.9 mass% or less, and more preferably 0.9 mass% or less. When the Al content, Mg content and Ti content are within the above ranges, it is difficult to react with the molten glass ribbon G and the molten glass ribbon G hardly adheres to each other, so that good durability is obtained. The Al content, the Mg content, and the Ti content may be 0 mass%, respectively.

The silicon nitride ceramics has a content of zirconium (Zr) of 3.5 mass% or less, preferably 3.5 mass% or less, a content of yttrium (Y) of 0.5 mass% or more, preferably 0.5 mass% or more, And preferably less than 10% by mass. Zr and Y are components which are difficult to mutually diffuse with the molten glass ribbon G as compared with Al, Mg and Ti, and therefore may be contained in the above range. By being contained in the above-mentioned range, sintering of the silicon nitride powder can be promoted. Further, Zr is an optional component, and the Zr content may be 0 mass%.

The silicon nitride ceramics of the present embodiment is a sintered body obtained by a normal-pressure sintering method or a pressure sintering method, but may be a sintered body obtained by a reaction sintering method. The reaction sintering method is a method of heating a shaped body molded from a powder of metal silicon (Si) in a nitrogen atmosphere. Since the reaction sintering method does not use a sintering aid, a high-purity sintered body can be obtained, and the durability of the sintered body to the molten glass ribbon G can be improved.

A circular hole is formed through the center of the rotary member (50). A rod portion 64 is inserted through the circular hole. The inner diameter of the circular hole is larger than the outer diameter of the rod portion 64.

Further, an insertion hole is formed in the rotary member 50 through the through-hole. The shaft portions 67 and 68 are inserted into the insertion through holes. The inner diameters of the respective insertion through holes are larger than the outer diameters of the corresponding shaft portions 67, 68.

5 is a front view showing a modified example (1) of the rotating member. 6 (a) to 6 (c) are examples of cross-sectional views taken along the line VI-VI in Fig.

The outer circumferential surface 56A of the rotary member 50A shown in Fig. 5 is, for example, a curved shape whose cross-sectional shape is convex outward in the radial direction over the entire circumference, as shown in Fig. The outer peripheral surface 56A of the rotary member 50A is axially protruded radially outwardly from the axially opposite ends. The rotary member 50A does not have gear-shaped irregularities on the outer circumferential surface 56A. The rotary member 50A can be inserted into the molten glass ribbon G even if there is no irregularity of the gear shape. The molten glass ribbon G is not strongly cooled in the vicinity of the rotary member 50A and hardly hardened because no refrigerant flows into the rotary member 50A.

For example, as shown in Fig. 6 (b), the radius of curvature Ra of the convex curved shape is preferably from R1 mm to R100 mm in consideration of the gripping force with the molten glass ribbon G, More preferably R5 mm to R30 mm, and particularly preferably R10 mm to R20 mm. In the convex curved shape, for example, as shown in Fig. 6 (c), the radius of curvature Rb of the axially central portion and the radius of curvature Rc of both end portions in the axial direction may be complex R. [ At this time, the radius of curvature Rb, Rc is preferably from R1 mm to R100 mm, more preferably from R3 mm to R50 mm, still more preferably from R5 mm to R30 mm, and particularly preferably from R10 mm to R20 mm. In the convexly curved shape, a flat portion may be provided in a part, but a flat portion is preferable because the gripping force with the molten glass ribbon G is stabilized.

In consideration of the gripping force with the molten glass ribbon G, the width d in the radial direction of the rotary member 50A in the convex curved shape shown in Fig. 6B is preferably 0.5 mm or more, more preferably 1 mm or more More preferably 2 mm or more. Similarly, the width d in the radial direction of the rotary member 50A in the convex curved shape is preferably 5 mm or less, more preferably 4 mm or less.

The radius r of the rotary member 50A shown in Figure 6 (b) is preferably 100 mm or more in consideration of prevention of contact between the mounting member 60 and the molten glass ribbon G and the horizontality of the shaft member 70 More preferably not less than 150 mm, and more preferably not less than 180 mm. Considering the positional adjustment of the rotary member 50A and the molten glass ribbon G and the fine adjustment of the rotation speed of the rotary member 50A, More preferably not more than 300 mm, and even more preferably not more than 270 mm.

The thickness w of the rotating member 50A is preferably 5 mm or more, more preferably 10 mm or more, and further preferably 15 mm or more, in consideration of the gripping force with the molten glass ribbon G, It is preferably not more than 60 mm, more preferably not more than 40 mm, and even more preferably not more than 35 mm in view of the improvement and the prevention of unnecessary enlargement of the grip width.

6 (a) to 6 (c), the outer peripheral surface 56A of the rotary member 50A has a curved shape whose cross-sectional shape is convex outward in the radial direction over the entire circumference, So that it is hard to break, and molding and processing costs are reduced. 6 (a) to 6 (c), it is preferable that the molten glass ribbon G can be stably formed into a plate-like glass.

7 to 10 are front views showing modified examples (2) to (5) of the rotating member. In the modification examples (2) to (5), the rotation members 50B to 50E are provided with cutouts 57B or through holes (not shown) for reducing the stress caused by the temperature gradient or the like in the rotating members 50B to 50E 58C, 58D, and 59E are formed. As described above, the rotating member made of metal up to now has a cooling channel therein, and therefore, it is difficult to form the cutout or the through hole. The rotating member of the present invention does not require cooling, and therefore it is not necessary to form a cooling channel. In addition, the notch or the through hole can be easily and arbitrarily formed. If the cutout or the through hole is formed in the rotary member, the stress of the rotary member can be relaxed, and the residual stress at the time of manufacturing the rotary member is also relaxed, so that distortion and breakage of the rotary member can be prevented .

The rotary member 50B shown in Fig. 7 is provided with a circular hole 53B through which the rod portion 64 (see Fig. 4) is inserted and an insertion hole 53b through which the shaft portions 67 and 68 (see Fig. 4) A plurality of arcuate notches 57B are formed at intervals along the inner periphery of the circular hole 53B in addition to the circular arc portions 54B and 55B.

The rotary member 50C shown in Fig. 8 is provided with a circular hole 53C through which the rod portion 64 (see Fig. 4) is inserted and an insertion hole 53C through which the shaft portions 67, 68 (see Fig. 4) A plurality of radial through holes 58C are formed radially in addition to the radial through holes 54C and 55C.

The rotary member 50D shown in Fig. 9 is provided with a circular hole 53D through which the rod portion 64 (see Fig. 4) is inserted and an insertion hole 53D through which the shaft portions 67, 68 (see Fig. 4) A plurality of long arc-shaped through holes 58D in the circumferential direction are formed in addition to the through holes 54D and 55D.

The rotary member 50E shown in Fig. 10 is provided with a circular hole 53E through which the rod portion 64 (see Fig. 4) is inserted, and an insertion through-hole 53a through which the shaft portions 67, 68 (see Fig. 4) 54E, 55E, and a plurality of circular through holes 59E.

The dimensions of the cutouts 57B and the through holes 58C, 58D, and 59E and their positions are obtained by stress analysis such as the finite element method.

While the embodiment of the present invention and its modifications have been described above, the present invention is not limited to the embodiments and modifications thereof. Various modifications and substitutions can be made without departing from the scope of the present invention.

For example, the support roll 40 of the present embodiment may be used only in a part of the area of the float bath 20, or may be used, for example, as a support roll on the downstream side. On the downstream side, since the temperature is low and the molten glass ribbon is hard, gripability tends to be a problem.

In consideration of the moldability of the molten glass ribbon G, the support roll 40 of the present invention is preferably used in the region where the viscosity of the molten glass ribbon G is 10 3 to 10 13 [dPa · s]. That is, in the case of the alkali-free glass, it is preferable to use the molten glass ribbon G in a temperature range of 800 to 1400 ° C. Conventionally, in the region 1 where the viscosity of the molten glass ribbon G is 10 6.5 to 10 13 [dPa · s], that is, in the case of the alkali-free glass, in the region 1 where the temperature of the molten glass ribbon G is 800 to 1000 ° C., It is more preferable that the support roll 40 of the present invention is used at least in the region 1 because a stable grip is possible even in the region 1.

Further, the support roll 40 of the present embodiment is used in the float method, but may be used in other molding methods, for example, in the fusion method.

In the case of the fusion method, the support rolls are cylindrical or cylindrically shaped, and are used in a pair in such a manner that the molten glass ribbon is sandwiched between the surface side and the side, and a group of support rolls including two support rolls A plurality of pairs are arranged.

Further, in the case of the fusion method, the plate glass forming apparatus has a trough-like member to which molten glass is continuously supplied. The molten glass that flows over the upper rim of both left and right sides of the gutter-like member flows down along both left and right side surfaces of the gutter-shaped member and merges at the lower rim intersecting the left and right sides. The molten glass ribbon is fed downwardly by a plurality of pairs of support rolls, with tension applied in the width direction and shrinkage in the width direction being suppressed.

Example

Hereinafter, the present invention will be described in detail by way of examples and the like, but the present invention is not limited to these examples.

In Examples 1 to 4, the relationship between the wettability of the sintered body to the molten glass and the impurities contained in the sintered body was examined.

The test specimens for evaluation and the test plates were produced by processing sintered bodies of silicon nitride (Si 3 N 4 ) vapors different from each other.

The content of the impurities in the sintered body was determined by analyzing the specimens cut out from the sintered body in each shape by glow discharge mass spectrometry. The impurities to be measured are included as a sintering aid and include aluminum (Al), magnesium (Mg), titanium (Ti), zirconium (Zr), and yttrium (Y).

The wettability of the sintered body to the molten glass was measured by a high-temperature wettability tester (ULKLIKO, WET1200). Specifically, each shaped glass piece of an alkali-free glass (AN100, manufactured by Asahi Glass Co., Ltd.) was placed on a test plate having a thickness of 1 mm, heated in a nitrogen atmosphere to 1150 캜 for 10 minutes, maintained at 1150 캜 for 10 minutes After the molten glass was produced, the temperature was dropped from 1150 占 폚 to 1050 占 폚 for 90 seconds, and maintained at 1050 占 폚 to measure the contact angle of the droplet. The measurement was carried out at a time point at which the temperature dropped to 1050 캜 and after 2 hours, 4 hours, 6 hours, and 8 hours from the point of time. The larger the contact angle, the less the molten glass is wetted by the sintered body, and therefore the reactivity between the molten glass and the sintered body is low. Further, the smaller the change in the contact angle over time, the easier the wetting is likely to last.

The evaluation results are shown in Table 1 and Fig. 11, the ordinate indicates the contact angle (°) and the abscissa indicates the elapsed time (h: hours). Also, it is 10,000 mass ppm = 1 mass%.

Figure 112014025814470-pct00001

As is clear from Table 1 and Fig. 11, the Al content is 0.1 mass% or less, preferably less than 0.1 mass%, the Mg content is 0.7 mass% or less, preferably 0.7 mass% or less, the Ti content is 0.9 mass% , Preferably less than 0.9 mass%, Zr content of 3.5 mass% or less, preferably less than 3.5 mass%, Y content of 0.5 mass% or more and 10 mass% or less, preferably 0.5 mass% or less and 10 mass% or less , The time change of the contact angle is small, and the contact angle after 8 hours is large, so that good durability can be obtained.

INDUSTRIAL APPLICABILITY The present invention is suitable for a forming apparatus for a plate glass having a support roll, a support roll, and a method for forming a plate glass using a support roll.

This application is based on Japanese Patent Application No. 2011-251274 filed on November 17, 2011, the Japanese Patent Application No. 2011-251274, filed on November 17, 2011, which claims priority to, and incorporates by reference all the contents of that application.

10: Plate glass molding device
20: Float bath
40: support roll
50: Rotating member
51:
52: unevenness
56A: outer peripheral surface
G: Melted glass ribbon

Claims (9)

In the support roll used for suppressing the shrinkage in the width direction of the molten glass ribbon in the shape of a strip,
And a rotary member in contact with the molten glass ribbon at a tip end thereof,
The rotating member does not have a refrigerant passage therein but is formed of ceramics,
Wherein at least a portion of the rotating member which is in contact with the molten glass ribbon is formed of silicon nitride ceramics,
Wherein said silicon nitride ceramics is a sintered body and has a content of aluminum (Al) of 0.1 mass% or less, a content of magnesium (Mg) of 0.7 mass% or less, and a content of titanium (Ti) of 0.9 mass% . The method according to claim 1,
Wherein the silicon nitride ceramics has a content of zirconium (Zr) of 3.5 mass% or less and a content of yttrium (Y) of 0.5 mass% or more and 10 mass% or less. 3. The method according to claim 1 or 2,
Wherein the outer circumferential surface of the rotary member is formed in a curved shape having a convex shape in a radially outward direction in its entire circumference. 3. The method according to claim 1 or 2,
And the rotary member has a gear-like concavo-convex on its outer periphery. 3. The method according to claim 1 or 2,
Wherein the rotating member is a member in contact with the molten glass ribbon in the float bath. A forming apparatus for a plate glass having the support roll according to claim 1 or 2. A method of forming a plate glass having a step of suppressing the shrinkage in the width direction of the molten glass ribbon by using the support roll according to claim 1 or 2. delete delete
KR1020147007121A 2011-11-17 2012-10-24 Support roll, molding deⅵce for plate glass haⅵng support roll, and molding method for plate glass using support roll KR102002655B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2011251274 2011-11-17
JPJP-P-2011-251274 2011-11-17
PCT/JP2012/077520 WO2013073352A1 (en) 2011-11-17 2012-10-24 Support roll, molding device for plate glass having support roll, and molding method for plate glass using support roll

Publications (2)

Publication Number Publication Date
KR20140098736A KR20140098736A (en) 2014-08-08
KR102002655B1 true KR102002655B1 (en) 2019-07-23

Family

ID=48429420

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020147007121A KR102002655B1 (en) 2011-11-17 2012-10-24 Support roll, molding deⅵce for plate glass haⅵng support roll, and molding method for plate glass using support roll

Country Status (5)

Country Link
JP (1) JP6127978B2 (en)
KR (1) KR102002655B1 (en)
CN (2) CN105776824A (en)
TW (1) TWI582051B (en)
WO (1) WO2013073352A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016135717A (en) * 2013-05-16 2016-07-28 旭硝子株式会社 Apparatus and method for manufacturing sheet glass, and glass ribbon
JP2016135715A (en) * 2013-05-16 2016-07-28 旭硝子株式会社 Molding method of plate glass, and manufacturing apparatus of plate glass
JP2016183070A (en) * 2015-03-26 2016-10-20 旭硝子株式会社 Support roll, glass manufacturing apparatus, and glass manufacturing method
CN105110607B (en) * 2015-08-28 2017-05-24 河南省海川电子玻璃有限公司 Ceramic edge rolling wheel for glass edge roller and preparation method thereof
JP6930464B2 (en) 2018-03-09 2021-09-01 Ｊｆｅスチール株式会社 Annealing method and annealing furnace for steel sheet
JP7251444B2 (en) * 2019-10-21 2023-04-04 Ａｇｃ株式会社 Glass plate manufacturing apparatus and glass plate manufacturing method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010070963A1 (en) 2008-12-19 2010-06-24 日本電気硝子株式会社 Device for producing glass sheet
WO2010147189A1 (en) * 2009-06-19 2010-12-23 旭硝子株式会社 Top roller, float glass production device, and float glass production method

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3661548A (en) * 1969-06-30 1972-05-09 Nippon Sheet Glass Co Ltd Apparatus for manufacturing glass ribbon by float process
JPH01219029A (en) * 1988-02-29 1989-09-01 Hoya Corp Formation of thin sheet glass
JP3837729B2 (en) * 1998-03-05 2006-10-25 日本電気硝子株式会社 Sheet glass forming equipment
JP3754271B2 (en) * 2000-04-28 2006-03-08 新日本製鐵株式会社 Butterfly valve and manufacturing method thereof
SG136796A1 (en) * 2002-03-06 2007-11-29 Zeiss Stiftung Device for supplying glass melt via a spout lip during production of float glass
JP4520192B2 (en) * 2004-03-22 2010-08-04 セントラル硝子株式会社 Method for producing float glass sheet
JP5056035B2 (en) * 2007-02-05 2012-10-24 旭硝子株式会社 Manufacturing method of plate glass by float method
JP2008239370A (en) 2007-03-26 2008-10-09 Asahi Glass Co Ltd Method for producing plate glass by floating process
JP4974053B2 (en) * 2007-04-19 2012-07-11 日本電気硝子株式会社 Forming roller and glass plate forming apparatus
KR20110047164A (en) * 2009-10-29 2011-05-06 코닝 인코포레이티드 Low friction edge rolls to minimize force circulation
US8146388B2 (en) * 2009-10-29 2012-04-03 Corning Incorporated Low friction edge roll to minimize force cycling

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010070963A1 (en) 2008-12-19 2010-06-24 日本電気硝子株式会社 Device for producing glass sheet
WO2010147189A1 (en) * 2009-06-19 2010-12-23 旭硝子株式会社 Top roller, float glass production device, and float glass production method

Also Published As

Publication number Publication date
TW201326062A (en) 2013-07-01
JPWO2013073352A1 (en) 2015-04-02
CN105776824A (en) 2016-07-20
CN103889910A (en) 2014-06-25
KR20140098736A (en) 2014-08-08
WO2013073352A1 (en) 2013-05-23
JP6127978B2 (en) 2017-05-17
TWI582051B (en) 2017-05-11

Similar Documents

Publication Publication Date Title
KR102002655B1 (en) Support roll, molding deⅵce for plate glass haⅵng support roll, and molding method for plate glass using support roll
CN110114319B (en) Method and apparatus for managing cooling of a glass ribbon
JP5130626B2 (en) Bubbling nozzle and method for refining molten glass
KR20200079259A (en) Molten glass conveying device, glass manufacturing device and glass manufacturing method
JPWO2013187179A1 (en) Sheet glass manufacturing apparatus and sheet glass manufacturing method
WO2014185127A1 (en) Method for molding glass plate, device for manufacturing glass plate, and method for manufacturing glass plate
KR102153286B1 (en) Device for manufacturing glass plate and method for manufacturing glass plate
KR101384375B1 (en) Method of manufacturing glass plate
KR20160010401A (en) Support roller, method for molding glass plate, method for manufacturing glass plate, and device for manufacturing glass plate
JP2015205786A (en) Glass molten liquid stirring mechanism, cover of stirrer for glass melting, and method of manufacturing glass
JP2018193269A (en) Production method of glass article, and melting furnace
JP6103048B2 (en) Glass plate manufacturing apparatus and glass plate manufacturing method
JP4132198B2 (en) Float glass manufacturing equipment
JP6094670B2 (en) Support roll, glass plate forming method, glass plate manufacturing apparatus, and glass plate manufacturing method
WO2023106093A1 (en) Glass transfer device, glass article manufacturing device, and glass article manufacturing method
WO2022225742A1 (en) Glass manufacturing apparatus with leak mitigation features
KR20200129165A (en) Exhaust conduit for glass melt system
WO2023163897A1 (en) Glass melting furnaces and vessels with improved thermal performance
KR20200135193A (en) Molten glass conveyance device, apparatus for producing glass and method for producing glass
JP2003261340A (en) Apparatus for supplying molten glass through overflow block in manufacturing float sheet glass
JPH0826736A (en) Electric glass melting furnace and electrode for the furnace
WO2024091384A1 (en) Apparatus and method for manufacturing a glass article
JP2008064387A (en) Heating furnace and heating method for heating object

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right
GRNT Written decision to grant