KR20150002677A - Device and method for producing glass sheet and edge-rolling device for producing float glass - Google Patents

Device and method for producing glass sheet and edge-rolling device for producing float glass Download PDF

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Publication number
KR20150002677A
KR20150002677A KR20147029124A KR20147029124A KR20150002677A KR 20150002677 A KR20150002677 A KR 20150002677A KR 20147029124 A KR20147029124 A KR 20147029124A KR 20147029124 A KR20147029124 A KR 20147029124A KR 20150002677 A KR20150002677 A KR 20150002677A
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South Korea
Prior art keywords
barrel head
glass
end side
outer peripheral
glass ribbon
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KR20147029124A
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Korean (ko)
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모토이치 이가
요시히로 시라이시
마사키 고토
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아사히 가라스 가부시키가이샤
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Publication of KR20150002677A publication Critical patent/KR20150002677A/en

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    • 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
    • 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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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Glass Compositions (AREA)

Abstract

It is an object of the present invention to provide a technique capable of producing a glass ribbon by a float process without generating a localized deformation portion called a straw. In the present invention, when a glass ribbon is produced by exerting a tensile force in the outward direction on both end portions of a glass ribbon by a plurality of pairs of top rolls, the top roll is rotated while pressing the outer peripheral edge to the widthwise ends of the glass ribbon, And the outer peripheral edge on the side of the rear end of the composite barrel head is applied to the end of the glass ribbon by a tensile force applied to the end of the glass ribbon by the outer peripheral edge of the composite barrel head The present invention relates to a manufacturing apparatus and a manufacturing method of a glass plate for forming a glass ribbon while applying a tensile force in a direction in which the glass ribbon is widened.

Description

TECHNICAL FIELD [0001] The present invention relates to a manufacturing apparatus and a manufacturing method of a glass plate, and a frame roll device for manufacturing a float glass,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for manufacturing a thin glass plate according to a float bath method, and a frame roll apparatus for producing float glass applied thereto.

BACKGROUND ART [0002] Glass substrates for flat panel displays, such as liquid crystal displays and plasma displays, have recently been made larger and thinner.

As an example of this type of glass substrate manufacturing method, there is known a float method in which a float bath in which a molten metal such as metal tin is stored is used, and a molten glass is stretched thinly in a horizontal direction on molten metal and molded. According to this float method, the molten glass is floated on the molten metal of the float bath to secure a required thickness according to the purpose, and the molten glass is drawn out in the horizontal direction to form a strip-shaped glass ribbon. By cutting this glass ribbon into a necessary size, a glass substrate having a desired size can be obtained.

According to this float method, in order to manufacture a glass substrate on which the enlargement and thinning are proceeding as described above, a top roll (T / R) is used in which the both ends in the width direction of the glass ribbon are pulled out on the molten metal of the float bath And a method of thinning the glass ribbon by stretching the glass ribbon toward both ends in the width direction is adopted. The thinly stretched glass ribbon is gradually cooled, cut to a required size, and polished and cleaned to obtain a desired glass substrate. According to this float method, large-size and thin-type glass substrates are produced in large quantities, and a large glass substrate having a thickness of 0.7 mm and a length and width of several meters is produced as a glass substrate.

In recent years, portable information terminal devices have been manufactured in large quantities. As an example of a liquid crystal panel applied to this portable information terminal device, after a liquid crystal panel is manufactured using a glass substrate having a thickness of about 0.7 mm, There is provided a liquid crystal panel provided with a glass substrate which is thinned to a thickness of about 0.3 mm on one side by a method such as wet etching.

10 shows an example of a float bath used in the float method. This float bath 100 is provided with a bottom bath 102 provided with a molten metal 101 such as molten tin therein, The molten glass 103 flows into the entrance side of the bath 102 from the converter of the melting furnace. The molten glass 103 is stretched to a desired width by the plurality of saw rolls 105 on the molten metal 101 and is slowly cooled to form the glass ribbon 106 of the required width and thickness.

As an example of the top roll 105 applied to the float bath 100 of this type, as shown in Fig. 11, a disk-like shape is formed, and the outer peripheral blade 105a having a saw- A top roll having a barrel head 105A is known (see Patent Document 1).

The barrel head 105A shown in Fig. 11 causes the edge portions 103a to exert a tensile force in the outward direction while allowing the outer peripheral edges 105a and 105a to engage with the edge portions 103a of the molten glass 103, By adjusting the width of the glass 103, the width and thickness of the glass ribbon 106 can be adjusted.

Japanese Patent Application Laid-Open No. 11-236231

From the above background, it is considered that the glass substrate tends to become thinner and the glass substrate having a thickness of about 0.3 mm from the beginning is used as a glass substrate for a panel of a portable information terminal device. In addition, even a glass substrate for a flat panel display is required to be further thinned.

Since the molten glass 103 that has flown into the float bath 100 and has been expanded into the float bath 100 is in a liquid state at a high temperature and can not be simply pulled, The molten glass 103 having the increased viscosity can be stretched and expanded by the barrel head 105A.

However, since there is a tendency to decrease in the molten glass 103 to which the tensile force is applied, the more the attempt to thin the molten glass 103 is, the stronger the tensile force is required to be applied by pressing the glass with a stronger force.

As a result, the edge portion of the barrel head 105A is inserted deeper into the edge portion 103a of the molten glass 103 than the state shown in Fig. 11, and the molten glass 103 is deformed greatly in the vicinity of its edge portion There is a problem to let it go.

12 is a view for explaining a state in which the barrel head 105A is pressed against the edge portion 103a of the molten glass 103 with a strong force.

When the barrel head 105A is strongly pressed against the edge portion 103a of the molten glass 103 shown in Figure 12 (a) as shown in Figure 12 (b), the edge portion 103a is pressed against the barrel 103a, And is deformed into a U-shaped bag shape so as to sink deeply in proportion to the pressing force of the head 105A. For example, if the glass deformed in this bag state is hardened, there is a problem that a local deformed portion 110 called a straw having a T-shaped cross section is generated as shown in Fig.

When the barrel head 105A is strongly pressed against the edge portion 103a of the molten glass 103 as shown in Fig. 12 (b), as shown in Fig. 12 (c) The deformed portion is deformed to overlap the bag portion 111a in the upper direction and the bag portion 111b in the lower direction as shown in Fig. 14 There is a problem that a local deforming portion 111 called a straw is generated. When the S-shaped local deformations 111 are generated, the molten metal may be curled to the inside of the glass as shown by arrows a and arrows b in Fig. 12 (c). As a result, There is a problem that the glass is cracked in the slow cooling step. For example, since the thermal expansion coefficient of the metal tin differs from that of the glass plate, stress may act on the glass plate at the portion where the metal tin is curled due to heat shrinkage during the slow cooling, thereby causing cracks.

When the glass ribbon is cut in the cutting process with the local deformations 110 and 111, when the glass ribbon is cut and folded to a desired size, cracks are generated in a position or direction different from a desired cut position or direction. There is a risk of inhibiting stable production. The generation of the local deformations 110 and 111 is remarkable in a thin glass plate, and in particular, when a glass plate having a thickness of 1 mm or less is manufactured by the float method like the above-described glass plate for a display device have.

A large number of barrel heads 105A are arranged along the edge portion 103a of the molten glass 103 so that a larger tensile force is applied to the molten glass 103 by the barrel head 105A It is also considered effective. In addition, the flatness of the molten glass 103 decreases as the distance between the barrel heads 105A is increased.

However, as shown in Fig. 10, the rotary shaft of the barrel head 105A is inclined at various angles with respect to the widthwise direction of the float bath 100 in accordance with the viscosity, hardness, and the like for each position of the molten glass 103, It is difficult to closely arrange the intervals of the barrel heads 105A inclined at various angles.

On the basis of these backgrounds, the present inventors have studied various techniques for forming a thin glass ribbon of 1 mm or less by molding a molten glass by a float method, and have found that by applying a tensile force to the edge portion of the molten glass, It has been found that when the ribbon is formed, the occurrence of the localized deformation portion called the straw can be suppressed by devising a position for giving a tension and a barrel head of a top roll used for this purpose.

It is another object of the present invention to provide a technique capable of arranging a barrel head installed in a float bath more closely than before.

The present invention relates to a method and a manufacturing apparatus for a glass plate capable of producing a glass ribbon without causing localized deformation when a thin glass ribbon is formed by the float method and contributing to the stable production of the glass plate, It is intended to provide a device.

A float bath for accumulating molten metal, forming a flow path of the molten glass on the molten metal and moving the molten glass from an upstream region to a downstream region of the flow path to form a glass ribbon, And a plurality of pairs of top rolls disposed on both sides in the width direction of the movement path from an upstream region to a downstream region of the movement path in the float bath, wherein the top rolls are horizontally And a plurality of rows of outer circumferential blades provided on the distal end side of the rotation shaft and rotated while being pressed against the widthwise end portions of the glass ribbon conveyed from the upstream region to the downstream region along the movement path, And an outer peripheral edge on the front end side of the composite barrel head and an outer peripheral edge on the rear end side of the composite barrel head Relates to a manufacturing device for Li is provided to enable independent rotation to a glass plate.

The present invention relates to a manufacturing apparatus of a glass plate in which the number of revolutions of the outer peripheral edge on the tip end side of the composite barrel head is set to be larger than the number of revolutions of the outer peripheral edge on the rear end side.

The present invention relates to an apparatus for manufacturing a glass plate described above wherein the diameter of the outer peripheral edge on the tip end side of the composite barrel head is larger than the diameter of the outer peripheral edge on the rear end side.

In the present invention, the composite barrel head is a composite structure of a front end side barrel head having an outer peripheral edge and a rear end side barrel head having an outer peripheral edge, and after the rear end side barrel head is provided, And the rotation axis of the barrel head on the distal end side extends so as to penetrate the rear end side rotation shaft and the rear end side barrel head.

The present invention is characterized in that a region where the logarithmic value of the viscosity of the glass ribbon is in the range of 5.29 to 6.37 dPa.s is defined as an intermediate region of the movement path of the molten glass, The present invention relates to an apparatus for producing a glass sheet.

The present invention relates to an apparatus for manufacturing a glass plate described in any one of the above items, wherein the thickness of the glass ribbon formed by the float bath is 1 mm or less.

The present invention relates to an apparatus for producing a glass plate described in any one of the above items, wherein alkali glass having the following composition is applied as the molten glass in the mass percentage based on oxide.

SiO 2 : 50 to 73%, Al 2 O 3 : 10.5 to 24%, B 2 O 3 : 0 to 12%, MgO: 0 to 8%, CaO: 0 to 14.5%, SrO: 0 to 24% : from 0 to 13.5%, MgO + CaO + SrO + BaO: 9 to 29.5%, ZrO 2: 0 to 5%.

The present invention relates to an apparatus for producing a glass plate described in any one of the above items, wherein alkali glass having the following composition is applied as the molten glass in the mass percentage based on oxide.

SiO 2 : 58 to 66%, Al 2 O 3 : 15 to 22%, B 2 O 3 : 5 to 12%, MgO: 0 to 8%, CaO: 0 to 9%, SrO: 3 to 12.5% : 0 to 2%, MgO + CaO + SrO + BaO: 9 to 18%, ZrO 2: 0 to 5%.

The present invention relates to an apparatus for producing a glass plate as set forth in any one of the preceding claims, wherein as the molten glass, an alkali-free glass having the following composition is applied in the mass percentage based on oxide.

SiO 2 : 54 to 73%

Al 2 O 3 : 10.5 to 22.5%

B 2 O 3 : 0 to 5.5%

MgO: 0 to 8%

CaO: 0 to 9%

SrO: 0 to 16%

BaO: 0 to 2.5%

MgO + CaO + SrO + BaO: 8 to 26%

The present invention relates to a method of manufacturing a glass sheet for forming a glass ribbon by molding while moving a molten glass along a moving path of a molten glass provided on a molten metal, the method comprising the steps of: When the glass ribbon is produced by exerting an outward tensile force on both end portions of the glass ribbon by a plurality of pairs of top rolls arranged at both ends in the width direction, the top roll is conveyed from the upstream region to the downstream region And the barrel head is provided with a plurality of rows of outer circumferential blades in a cylindrical outer circumferential wall, and the outer circumferential blades are arranged in the width direction of the glass ribbon Wherein the composite barrel head is a composite barrel head that pressurizes the end portion and applies a tensile force to the glass ribbon while rotating, The outer peripheral edge of the outer peripheral edge of the composite barrel head and the outer peripheral edge of the end portion of the outer peripheral edge of the outer peripheral edge of the rear end side of the composite barrel head are independently rotatable independently from each other, To a glass ribbon by applying a tensile force to the glass ribbon in a direction in which the glass ribbon is widened.

The composite barrel head according to the present invention is a composite barrel head in which a composite barrel head in which the number of revolutions of the outer peripheral edge on the tip end side is made larger than the number of revolutions of the outer peripheral edge on the rear end side is used, The present invention relates to a method for producing a glass sheet.

The composite barrel head according to the present invention is a composite barrel head in which a composite barrel head having a diameter larger than the diameter of the outer peripheral edge of the rear end side of the outer peripheral edge of the tip end side is used to apply a desired tensile force to the end of the glass ribbon, And a method for producing the same.

The present invention is characterized in that the composite barrel head is provided in the midstream region of the molten glass as the middle region of the movement path of the molten glass as the region where the viscosity of the glass ribbon is in the range of 5.29 to 6.37 dPa · s, And a method for producing the same.

The present invention relates to a method for producing a glass plate described in any one of the above items, wherein the molten glass is an alkali-free glass having the following composition in the mass percentage based on oxide.

SiO 2 : 50 to 73%, Al 2 O 3 : 10.5 to 24%, B 2 O 3 : 0 to 12%, MgO: 0 to 8%, CaO: 0 to 14.5%, SrO: 0 to 24% : from 0 to 13.5%, MgO + CaO + SrO + BaO: 9 to 29.5%, ZrO 2: 0 to 5%.

The present invention relates to a method for producing a glass plate described in any one of the above items, wherein the molten glass is an alkali-free glass having the following composition in the mass percentage based on oxide.

SiO 2 : 58 to 66%, Al 2 O 3 : 15 to 22%, B 2 O 3 : 5 to 12%, MgO: 0 to 8%, CaO: 0 to 9%, SrO: 3 to 12.5% : 0 to 2%, MgO + CaO + SrO + BaO: 9 to 18%, ZrO 2: 0 to 5%.

The present invention relates to a method for producing a glass plate described in any one of the above items, wherein the molten glass is an alkali-free glass having the following composition in the mass percentage based on oxide.

SiO 2 : 54 to 73%

Al 2 O 3 : 10.5 to 22.5%

B 2 O 3 : 0 to 5.5%

MgO: 0 to 8%

CaO: 0 to 9%

SrO: 0 to 16%

BaO: 0 to 2.5%

MgO + CaO + SrO + BaO: 8 to 26%

The present invention relates to a frame roll device for producing a float glass which is provided on a float bath for feeding a molten glass onto a molten metal to form a glass ribbon and exerts a tensile force in an outward direction on a widthwise end of the glass ribbon, And a composite barrel head provided at a distal end of the rotary shaft and having a plurality of outer peripheral blades in a cylindrical outer peripheral wall, The outer circumferential edge is an outer circumferential edge that is engaged with the glass surface when the composite barrel head is pressed against the surface of the glass ribbon to exert tensile force. The outer circumferential edge of the outer circumference on the front end side of the composite barrel head, The present invention relates to a frame roll device for manufacturing float glass,

The present invention relates to a frame roll device for manufacturing float glass as described above, wherein the number of revolutions of the outer peripheral edge on the tip end side of the composite barrel head is larger than the number of revolutions of the outer peripheral edge on the rear end side.

The present invention relates to a frame roll device for manufacturing float glass as described above, wherein the diameter of the outer peripheral edge on the tip end side of the composite barrel head is larger than the diameter of the outer peripheral edge on the rear end side.

In the present invention, the composite barrel head is a composite structure of a front end side barrel head having an outer peripheral edge and a rear end side barrel head having an outer peripheral edge, and after the rear end side barrel head is provided, And the rotary shaft of the barrel head on the distal end side extends so as to penetrate the rear end side rotary shaft and the rear end side barrel head.

The present invention is characterized in that the front end side barrel head and the rear end side barrel head both have a hollow structure having a refrigerant flow path therein and that both the front end side rotation shaft and the rear end side rotation shaft have a coolant path And the return path of the refrigerant at the distal end side rotary shaft is connected to the hollow portion of the head end side barrel head at the distal end portion of the distal end side rotary shaft, And the return path is connected to the hollow portion of the rear end side barrel head at the tip end portion of the rear end side rotational shaft.

According to the manufacturing method and the manufacturing apparatus of the present invention, tensile force is changed from the outer peripheral edge on the distal end side of the composite barrel head to the outer peripheral edge on the rear end side in the movement path of the float bath, It is possible to apply a tensile force in the outward direction to the end portion of the glass ribbon by means of a composite barrel head capable of applying a tensile force to the glass ribbon and to stretch the glass ribbon by using the tensile force to form a thin and uniform glass ribbon.

When the peripheral speed at the tip end side is fast and the peripheral speed at the rear end side is slow when the distal end side of the composite barrel head is rotated while being pressed against the end portion of the glass ribbon and the tensile force in the outward direction is applied to the end portion of the glass ribbon, The composite barrel head presses the end portion of the glass ribbon to exert a strong force to apply a thin glass ribbon to the end portion of the glass ribbon. It is possible to make it difficult to generate a localized deformation portion called a straw rather than a conventional barrel head.

As a result, the glass ribbon which does not cause localized deformation can be cut in a subsequent process to produce a glass plate, so that a glass plate having a desired dimension can be obtained without causing cracks or incisions.

When a glass plate having a thickness of less than 1 mm, preferably 0.7 mm or less, more preferably 0.5 mm or less, more preferably 0.3 mm or less, and particularly preferably 0.1 mm or less is manufactured as a glass substrate for a display device, The deformation amount in the thickness direction from the end side of the glass ribbon to the thickness direction of the glass ribbon can be controlled to be in the range of 5 to 10 mm by applying a tensile force to the molten glass in the midstream region, It is possible to obtain a thin glass ribbon which does not cause localized deformation, and by cutting the glass ribbon, a thin glass plate having a desired dimension of 1 mm or less without cracks or cutouts can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing an overall configuration of a glass plate manufacturing apparatus according to a first embodiment of the present invention. Fig.
Fig. 2 is a configuration diagram showing a first embodiment of a composite barrel head applied to a top roll installed in the same manufacturing apparatus. Fig.
3 is a partial cross-sectional view of the same composite barrel head.
Fig. 4 is a cross-sectional view showing a rotating shaft portion of a composite barrel head installed in the same manufacturing apparatus. Fig.
5 is a graph showing the state of the viscosity for each float bath length position with respect to an example of the molten glass supplied to the same manufacturing apparatus.
6 is a cross-sectional view showing a second embodiment of a composite barrel head installed in the same manufacturing apparatus.
7 is a graph showing the relationship between the widths (total widths) of the glass ribbons formed by the spacing between heads having different peripheral velocities provided in the same composite barrel head.
8 is a graph showing the relationship between the number of the same composite barrel heads and the plate width of the glass ribbon to be formed.
9 is a graph showing the relationship between the angle of the same composite barrel head and the plate width of the glass ribbon to be molded.
10 is a plan view showing an example of a conventional float bath on which a top roll is mounted.
11 is a cross-sectional view showing an example of a state in which a barrel head provided on a conventional top roll is press-fitted into an end portion of a glass ribbon.
Fig. 12 shows the relationship between the end of the molten glass and the conventional barrel head. Fig. 12 (a) is a cross-sectional view showing the end of the glass ribbon, Fig. 12 FIG. 12C is a cross-sectional view showing an example of a S-shaped local deformed portion (straw) of a cross section formed on the end side of the glass ribbon.
Fig. 13 is a cross-sectional view showing an example of a T-shaped local deformed portion formed on the end side of the glass ribbon; Fig.
14 is a cross-sectional view showing an example of a S-shaped locally deformed section formed on the end side of the glass ribbon.

≪ First Embodiment >

Hereinafter, a first embodiment of the apparatus for manufacturing a glass sheet according to the present invention will be described with reference to the accompanying drawings, but the present invention is not limited to the embodiments described below.

Fig. 1 shows a schematic configuration of a first embodiment of the apparatus for producing a glass plate according to the present invention. The apparatus (float bath) 1 for producing a glass plate according to the present embodiment has a substantially rectangular refractory A molten metal 3 such as metal tin contained in the bath 2 and a top roll 11 disposed in the bathtub 2 in a plurality have.

The bathtub 2 is composed of the bottom structure of the refractory material and the side wall and the top structure, but in FIG. 1, only the bottom structure is seen in a plan view. A gas supply pipe such as a non-oxidizing gas or the like and an accessory device such as a temperature regulator are provided on the upper structure side of the bathtub 2 so that the atmosphere of the bathtub 2 can be controlled in a non-oxidizing gas atmosphere, The temperature of the upper space portion can be controlled to a desired temperature.

In Fig. 1, at the left end side of the bathtub 2, there is provided an inlet portion 5 for supplying the molten glass G onto the molten metal 3 from the converter of the glass melting furnace provided in the previous step. An outlet portion 6 is formed at an end opposite to the side where the inlet portion 5 is provided in the bathtub 2. A plurality of conveying rolls 7 are arranged outside the outlet portion 6, (7A) is formed.

A rectilinear movement path 8 is defined in a plane for molding the molten glass G on the molten metal 3 from the inlet 5 to the outlet 6 in the bathtub 2 .

When the molten glass G flows into the molten metal 3 along the movement path 8 from the inlet 5, the molten glass G is spread to a required thickness and width to form molten glass ribbon 9 The glass ribbon 10 as a final shape of a band-shaped band having a uniform width is formed and the glass ribbon 10 is conveyed from the outlet portion 6 to the exit portion 6, And is discharged to the slow cooling line 7A side. The moving path 8 partitioned on the molten metal 3 inside the bathtub 2 is also rectangular in shape because the plane shape of the bathtub 2 is formed in a rectangular shape in the present embodiment, The planar shape of the path 8 is not limited to a rectangular shape, and any shape conforming to the plane shape of the bathtub 2 is possible.

The bathtub 2 of the present embodiment is arranged at predetermined intervals from the upstream region toward the downstream region along both widthwise ends of the movement path 8 between the inlet portion 5 and the outlet portion 6 A plurality of top rolls 11 are arranged. In the present embodiment, the molten glass G supplied from the inlet portion 5 is stretched in the width direction by the above-described plurality of top rolls 11 to form the glass ribbon 9 in the molten state described above, (To the outlet portion 6 side), and finally a strip-shaped glass ribbon 10 of a predetermined width is obtained.

In the bathtub 2 of the present embodiment, sixteen top rolls 11 are provided on both sides in the width direction of the moving path 8, respectively, from positions for starting to expand the width of the molten glass G Respectively. The sixteen top rolls 11 are denoted by the reference numerals A 0 to A 15 for convenience, and their individual arrangements are described below.

The top roll 11 of the, top roll of the first stage (11A 0) and the first of the top roll (11A 1) through the fourth top roll (11A 4) is, based on a barrel head 18 that is described later in a top roll (rim roll device) is, the top roll of the fifth (11A 5) to the top roll of the 10th (11A 10) is, a top roll having a composite barrel head 30 that is described later having a (Rim roll apparatus), and the eleventh top rolls 11A 11 to 15th top rolls 11A 15 constitute a top roll (rim roll apparatus) provided with a reference barrel head 18 to be described later, .

Top roll (11A 1) through the fourth of the top roll (11A 4) and, wherein the 11th of the top roll (11A 11) to the top roll of the 15th (11A 15) in the first stage, the rotation axis (17 And a reference barrel head 18 shown in Fig. 3 integrated at the tip end thereof.

Although not shown in Fig. 1, the mechanism for rotating the rotating shaft 17 and the mechanism for moving the rotating shaft 17 are not limited to the case where the rotating shaft 17 passes through the side wall of the bathtub 2 and reaches the outside of the bathtub 2 And a rotation driving device and a moving device are provided outside the tub 2. As the moving device of the rotating shaft 17, for example, a moving device provided with a rotation driving device such as a motor can be applied to a moving carriage provided movably along a rail member provided outside the position where the bathtub 2 is installed have. These rotary driving devices and the moving devices are equivalent to the driving device and the moving device of the top roll provided in a general float bath. The rotary shaft 17 is, for example, In the width direction of the movement path 8. In Fig. 1, these rotary drive devices and moving devices are omitted, and only the outline of the front end side of the rotary shaft 17 and the barrel head provided thereon are shown.

As shown in Fig. 3, the reference barrel head 18 is provided with an outer peripheral edge 20a of the rotary drum 20 with an outer peripheral edge 19 having a two-column structure. Both the rotary shaft 17 and the rotary drum 20 have an internal hollow structure and the inside of the rotary shaft 17 and the hollow portion 20b formed inside the rotary drum 20 communicate with each other.

A supply pipe 17b having a supply passage 17a for cooling water is provided inside the rotary shaft 17 and a return flow passage 17c for cooling water is provided in the gap between the supply pipe 17b and the inner peripheral wall of the rotary shaft 17 Respectively. With these configurations, the cooling water is supplied from the supply path 17a to the hollow portion 20b of the rotary drum 20 and the cooling water is recovered through the return flow path 17c, thereby rotating the rotary shaft 17 and the rotary drum 20 So that they can be cooled from their inner sides. Since the supply passage 17a of the supply pipe 17b constitutes the outgoing passage of the cooling water (coolant) and the cooling water reaches the return passage 17c through the hollow portion 20b, ). In addition, the cross-sectional shape of the hollow portion 20b may be appropriately changed so that the water flow is efficiently circulated.

The outer circumferential edge 19 of the reference barrel head 18 is continuously formed along the outer circumferential wall 20a of the round tubular rotary drum 20 such that a plurality of edges of a quadrangular pyramid shape are two stages have. Since the outer circumferential edges 19 of the circumferential edges 19 are formed in the circumferential direction of the rotary drum 20 with the same pitch and at the same pitch, Stage structure. The end face wall 20c on the side of the rotary drum 20 connected to the rotating shaft 17 side integrated with the end face wall 20d on the side away from the rotary shaft 17 in the rotary drum 20 of the present embodiment has a flat plate shape Respectively. The end face wall 20c may be formed in such a shape that the end is directed toward the rotating shaft 17 side.

The first end of the top roll (11A 0) to the fourth of the top roll (11A 4) (i.e., the top roll (11A 4) is a washing fifth from the top roll (11A o) of the first stage), the molten metal ( The molten glass G introduced from the inlet 5 into the upper moving path 8 of the molten glass ribbon 9 is placed in the upstream region where the molten glass G is gradually cooled and the molten glass ribbon 9 starts to rise in viscosity.

The fifth of the top roll (11A 5) to the top roll of the 10th (11A 10) of said structure, middle area of the movement path (8), that is, the glass ribbon 9 is a viscosity higher than the upstream region Area.

The 11th top roll (11A 11) to the top roll (11A 15) of the 15th of the structure is, the downstream portion of the travel path (8), that is, the viscosity of the glass ribbon (9) more than the middle area Is set for the region where the height is increased.

The fifth of the top roll (11A 5) through the 10th top roll (10 11A) is in, the composite barrel head 30 of the structure is provided as shown in FIG.

The composite barrel head 30 shown in Fig. 2 is an example in which the above-described reference barrel head 18 has a composite structure of two front and rear stages.

As shown in Fig. 2, the reference barrel head 18 is constituted by the front end side of the composite barrel head 30. As shown in Fig. That is, a rotary drum 20 having an outer peripheral blade 19 is provided at the tip end of the rotary shaft 17, and the interior of the rotary drum 20 is water-cooled. The rear end side barrel head 33 constituting the rear side of the composite barrel head 30 is configured such that the rotary drum 35 provided with the outer peripheral blade 19 having the same structure as the reference barrel head 18 has a multi- And is provided at the distal end of the rotary shaft 36. The rotary shaft 36 has a double pipe structure including an inner pipe 36a and an outer pipe 36b as shown in Fig. 4. In addition, a reference barrel head 18 is provided in the inner pipe 36a, And has a multi-tube structure in which a rotating shaft 17 of the rotating shaft 17 is inserted.

The rotary drum 35 of the rear end side barrel head 33 has a hollow structure similar to the reference barrel head 18 but the rotary shaft 17 passes through the central portion of the end face wall 20d.

The inner tube 36a and the outer tube 36b have a double pipe structure. However, as shown in FIG. 4, when the inner tube 36a and the outer tube 36b are viewed in cross section, The space formed between the tubes 36b is divided into two right and left channels 36c and 36d by the partitioning members 37 and 38 extending in the radial direction of the inner tube 36a and the outer tube 36b . The flow paths 36c and 36d formed between the inner pipe 36a and the outer pipe 36b are formed over the entire length of the inner pipe 36a and the outer pipe 36b, And communicates with the interior of the rotary drum 35 at the front end side of the rotary shaft 36.

One of the flow paths 36c and 36d between the inner pipe 36a and the outer pipe 36b is used as the outgoing path of the cooling water and the other is used as the return path of the cooling water. In Fig. 4, the left side flow path 36c is referred to as a supply side flow path (cooling path) of cooling water and the flow path 36d is described as a return side flow path (return path) of cooling water for convenience.

The composite barrel head 30 having the configuration shown in Fig. 2 is configured so that the reference barrel head 18 on the leading end side and the barrel head 33 on the trailing end side thereof can be rotationally driven separately at a desired number of revolutions . That is, the rotational drive motor, not shown, to which the rotational axis 13 of the reference barrel head 18 is connected is connected to the rotational axis 36 of the rear end barrel head 33, So that each head is rotatably driven. Alternatively, gears may be combined as needed to divide the number of revolutions of one rotary drive motor so that different revolutions can be transmitted to the rotary shafts (36, 17).

The composite barrel head 30 shown in Fig. 2 is used by being pressed against the end 9a in the width direction of the glass ribbon 9. Fig. The rotary shafts 17 and 36 are rotated while pressing the barrel heads 18 and 33 on the upper surface of the glass ribbon 9 with the rotary shafts 36 and 17 substantially in the horizontal direction, And is used for molding by stretching the glass ribbon 9 by exerting a tensile force in the outward direction on the end portion 9a.

The number of revolutions of the outer peripheral blade 19 of the reference barrel head 18 on the distal end side is set to be large and the number of revolutions of the outer peripheral blade 19 of the rear end side barrel head 33 is set to The width direction end portion 9a of the glass ribbon 9 is pressed upward and a tensile force is applied so that the width direction end portion 9a is pulled outward due to the difference in the number of revolutions thereof.

This operation causes the composite barrel head 30 to generate a difference in peripheral speed between the outer circumferential edge 19 on the distal end side and the outer circumferential edge 19 on the rear end side, 9a in the outward direction.

The composite barrel head 30 of the present embodiment has a basic structure in which two reference barrel heads 18 are connected in front and rear, but the outer circumferential edge 19 is not limited to the two stages but may be a multi-stage structure having three or more stages .

The speed and diameter of the outer peripheral edge 19 of the reference barrel head 18 and the outer peripheral edge 19 of the rear end side barrel head 33 and the diameter of the glass ribbon G The contact lengths of the first and second contact portions are described below.

10, when a plurality of the barrel heads 105A of the top roll 105 are provided on the float bath 100, the top rolls are arranged horizontally and inclined in the width direction of the float bath 100 .

As shown in Fig. 10, when a plurality of barrel heads 105A are provided, an angle in the width direction of the float bath 1 is inclined so that the glass ribbon 9 is pulled outward Because the tensile force is effective. 10, the rotation axes of the plurality of top rolls 105 adjacent to each other in the longitudinal direction of the float bath 1 interfere with each other. As a result, the float bath 1 There is a problem that the top rolls 105 can not be arranged closely.

In this regard, in the composite barrel head 30 of the two-stage structure having the reference barrel head 18 on the tip end side and the rear end barrel head 33 as described herein, the following relationship (1) Respectively.

tan? = kx (Uin-Uout) / d / Uave 占 L ... (1)

Is the inclination angle of the composite barrel head 30 with respect to the width direction of the float bath 1, Uin is the rotational speed of the outer peripheral edge of the barrel head on the inner side (tip end side, reference) U is the average speed of the outer circumferential edge of the barrel head inside and outside, d is the distance between the inner barrel head and the outer barrel head, L is the outer circumferential edge of the barrel head, Contact length of glass ribbon, k: coefficient)

The relationship between the velocity of the outer peripheral edge of the Uin inner side (front end side, reference) barrel head and the outer peripheral edge of the Uout outer side (rear end side Is the same as the case where the angle? Of the composite barrel head 30 is inclined by causing a difference in the rotational speed of the outer peripheral edge of the barrel head. Further, the angle [theta] is preferably 5 to 45 [deg.], More preferably 10 to 30 [deg.].

In this regard, even if the inclination angle &thetas; of the composite barrel head 30 is not changed, the difference in rotational speed between the inner and outer barrel heads must be given to the outer peripheral blade 19, 1, it is possible to generate a strong tensile force on the glass ribbon 9 even if it is arranged more in parallel. This means that the interval of the composite barrel heads 30 adjacent to the longitudinal direction of the float bath 1 can be arranged at a narrower pitch than the conventional one. This makes it possible to arrange the composite barrel heads 30 at narrower intervals than in the prior art, thereby making it possible to manufacture a glass plate G with a higher flatness and thinness.

For example, in the case of attempting to manufacture the glass ribbon 10 using only the reference barrel head 18 of the conventional tilting type, it has been a limit to set the interval between the adjacent reference barrel heads 18, 18 to about 800 mm, When the composite barrel head 30 is provided, it can be arranged closely to an interval of about 500 mm or less. Since the composite barrel head 30 can be densely arranged in this way, the bending of the glass ribbon 10 during molding can be improved, and the production of a glass ribbon having a high flatness is advantageous.

In order to manufacture the glass ribbon 10 by using the glass manufacturing apparatus (float bath) 1 of the present embodiment, the molten glass G is supplied from the inlet 5 to the upward movement path 8 of the molten metal 3, And a tensile force is externally applied to both end portions of the glass ribbon 9 in the molten state in the width direction by using a plurality of the standard barrel head 18 and the combined barrel head 30, 9 can be adjusted to obtain a glass ribbon 10 having a desired width. Further, the glass ribbon 10 can be obtained by cutting the glass ribbon 10 to a desired size in the cutting step of the subsequent step of the slow cooling line 7A.

The top rolls 11A 0 to 11A 4 and the top rolls 11A 11 to 11A 15 in the manufacturing apparatus 1 of the present embodiment are provided with the reference barrel head 18 The outer circumferential edge 19 of the double row structure is pressed toward the widthwise end side of the glass ribbon 9 and the glass ribbon 9 of the upstream region and the downstream region In the widthwise direction of each of the first and second projecting portions.

In addition, the top roll of the fifth (11A 5) to the top roll of the 10th (11A 10) is so provided with a composite barrel head 30, based on the barrel head (18 with respect to the glass ribbon (9) of the middle region So that the glass ribbon 9 can be widened.

The composite barrel head 30 has the outer peripheral blade 19 of the reference barrel head 18 having a large peripheral velocity and the outer peripheral blade 19 of the rear end side barrel head 33 having a small peripheral velocity, A strong tensile force can be exerted in the direction of widening the width of the glass ribbon 9 due to the difference in the peripheral speed of the blade 19, which is advantageous in manufacturing a thinner, higher flatness glass ribbon 10.

Since the glass ribbon 9 in the upstream region is low in viscosity and it is difficult to apply a strong tensile force originally, the reference barrel head 18 is preferable, and the glass ribbon 9 in the downstream region has a high viscosity, Even if it is pressed by the reference barrel head 18, the deformation amount in the thickness direction is small. In view of this point, it is preferable to provide the composite barrel head 30 in the middle region because the glass ribbon 9 is stretched by applying a strong tensile force to the glass ribbon 9 in the middle region. However, Or the composite barrel head 30 may be appropriately installed in a part of the downstream region.

The number of the composite barrel heads 30 to be installed in the midstream region is not specifically defined in the present embodiment, and a necessary number of glass ribbons 10 having a desired final thickness can be provided. For example, it is not necessary to make the total number of barrel heads in the midstream region be the composite barrel head 30, and a part of the barrel heads may be used as the composite barrel head 30 and the remaining barrel heads may be used as the reference barrel head 18. [ . In order to mold the glass ribbon 10 having a desired thickness, a necessary number may be provided so as not to generate a localized deformation portion called a straw.

The total number of the barrel heads 18, 30 provided in the entire region from the upstream region to the downstream region is not limited to the example of the present embodiment, and the number required to mold the glass ribbon 10 having a desired thickness You can install it.

According to the composite barrel head 30 of this embodiment, by the operation of pressing the outer peripheral blades 19 and 19 having different rotational speeds against the end of the glass ribbon 9, the width of the molten glass G is naturally widened outward A thin glass ribbon 10 can be produced, which is advantageous when the glass ribbon 9 is thinly formed.

The molten glass G thinned by using the top roll 11A 1 to the top roll 11A 15 is gradually cooled as it moves from the upstream region to the downstream region of the movement path 8 to increase the hardness, 8, a glass ribbon 10 of a certain width and thickness is formed and reaches the outlet portion 6 and is conveyed to the slow cooling line 7A side of the subsequent process. According to the glass plate manufacturing apparatus 1 of the present embodiment, since no localized deformation is generated in the glass ribbon 10 that has been conveyed to the slow cooling line 7A in which the local deformation portion called the straw has been formed, The glass ribbon 10 is not likely to crack.

Since a cutting line (not shown) is provided in the subsequent step of the slow cooling line 7A, a glass plate of a desired size can be obtained by cutting the glass ribbon 10 after the slow cooling to a required size. Since no localized deformation is generated in the glass ribbon 10 to be fed to the cutting line, there is no fear of occurrence of cutting defective portions at the time of cutting and folding, which contributes to improvement of productivity.

As to the viscosity of the glass ribbon 9 in the molten state, for example, FIG. 5 shows a state in which a molten glass of a general alkali-free glass changes its viscosity with a decrease in temperature to become a glass ribbon .

An area in which the viscosity logarithm of the viscosity of the glass ribbon 9 is less than 5.29 dPa · s is referred to as an upstream region of the movement path 8 and a viscosity of the glass ribbon 9 Of the glass ribbon 9 is in the middle region of the movement path 8 and the area in which the common logarithm of the viscosity of the glass ribbon 9 exceeds 6.37 dPa · s in the downstream region of the movement path 8, . The logarithm of the viscosity of the glass ribbon 9 in the range of 5.29 to 6.37 dPa · s corresponds to the range of the viscosity of the glass ribbon 9 of 10 5.29 to 10 6.37 dPa · s.

Thus, the top roll of the fifth in the middle region, the viscosity of the glass ribbon (9) 10 5.29 to 10 6.37 dPa · s (11A 5 ) through the 10th of the top roll (11A 10) the layout, these the compound The barrel head 30 is preferably used. The glass ribbon 10 by by preferably applying a tension to the glass ribbon (9) to, the fifth of the top roll (11A 5) through the 10th top roll (11A 10), the composite barrel head 30 of Thinner, and more flat.

The composition of the molten glass (G) to be produced in the glass manufacturing apparatus (1) of the present embodiment is not particularly limited.

Therefore, any of alkali-free glass, soda lime glass, mixed alkali-base glass or borosilicate glass or other glass may be used. The use of the glass product to be produced is not limited to flat panel displays, architectural use, and automotive applications, and may be used for various other purposes. Alkali-free glass for a flat panel display which requires high quality is particularly preferable.

Further, as a glass suitable for the molten glass (G), alkali-free glass having the following composition can be used in the mass percentage based on oxide.

SiO 2 : 50 to 73%, preferably 50 to 66%, Al 2 O 3 : 10.5 to 24%, B 2 O 3 : 0 to 12%, MgO: 0 to 8%, CaO: 0 to 14.5% : 0 to 24%, BaO: 0 to 13.5%, MgO + CaO + SrO + BaO: 9 to 29.5%, ZrO 2: 0 to 5%.

When the melting point is high and the melting point is considered as a glass suitable for the molten glass (G), alkali-free glass having the following composition can be used in the mass percent based on oxide.

SiO 2 : 58 to 66%, Al 2 O 3 : 15 to 22%, B 2 O 3 : 5 to 12%, MgO: 0 to 8%, CaO: 0 to 9%, SrO: 3 to 12.5% : 0 to 2%, MgO + CaO + SrO + BaO: 9 to 18%, ZrO 2: 0 to 5%.

As a glass suitable for the molten glass (G), in consideration of a particularly high distortion point, an alkali-free glass having the following composition can be used in the mass percent based on oxide.

54 to 73% of SiO 2 ,

Al 2 O 3 : 10.5 to 22.5%

B 2 O 3 : 0 to 5.5%,

MgO: 0 to 8%

CaO: 0 to 9%,

SrO: 0 to 16%

BaO: 0 to 2.5%,

MgO + CaO + SrO + BaO: 8 to 26%.

&Quot; Second Embodiment "

6 shows a second embodiment of a composite barrel head applied to an apparatus for manufacturing a glass plate according to the present invention. The composite barrel head 40 of the second embodiment is a barrel head of a second embodiment, And the diameter of the barrel head on the front end side and the diameter of the barrel head on the rear end side are made different from each other.

As shown in Fig. 6, the reference barrel head 18 constitutes the tip end side of the composite barrel head 40 is the same as the configuration of the second embodiment in the previous embodiment. That is, a rotary drum 20 having an outer peripheral blade 19 is provided at the tip end of the rotary shaft 17, and the interior of the rotary drum 20 is water-cooled. The rear end side barrel head 43 constituting the rear side of the composite barrel head 40 is provided with the rotary drum 45 and the outer peripheral blade 49 which are equivalent in structure to the reference barrel head 18 but are small in diameter, The rotary drum 45 is provided at the tip of the rotary shaft 36 of the multi-tube structure. The structure of the rotating shaft 36 is the same as that of the previous embodiment.

The combined barrel head 40 of the present embodiment has an outer diameter 49 of the outer peripheral blade 49 of the rear end side barrel head 43 on the rear end side of the outer peripheral blade 19 of the reference barrel head 18 A tensile force can be exerted in the same manner as in the case of exerting the pulling force in the outward direction on the widthwise end portion 9a of the glass ribbon 9. [

That is, due to the structure of the composite barrel head 40, the circumferential lengths of the outer circumferential edge 19 on the distal end side and the outer circumferential edge 49 on the rear end side are different from each other, 19 are inserted deeper into the glass ribbon 9 than the outer peripheral blades 49 on the rear end side and the peripheral speeds of the outer peripheral blades 19 on the front end side and the outer peripheral blades 49 on the rear end side, So that a tensile force can be exerted toward the outside of the width direction end portion 9a of the glass ribbon 9. [

In the composite barrel head 40, even when the peripheral speeds of the outer peripheral blade 19 on the tip end side and the outer peripheral blade 19 on the rear end side are set to the same value, the outer peripheral blade 19 on the tip end side Since the outer diameter of the outer peripheral blade 19 on the rear end side is different, a peripheral speed difference naturally occurs between them, and a desired tensile force can be generated. Further, if the peripheral speed of the outer peripheral blade 19 on the tip end side is set to a high speed and the peripheral speed of the outer peripheral blade 19 on the rear end side is set to be late, the peripheral speed difference can be made larger, There is a characteristic that can be made larger.

6, tensile force is exerted in a necessary direction by using the difference in peripheral speed in the same manner as in the composite barrel head 40 of the first embodiment of the present invention, It is possible to form the glass ribbon 9 while applying a necessary tensile force to the end portion 9a in the width direction.

By arranging the composite barrel head 40, the outer circumferential blade 19 having a larger diameter is more deeply engaged with the glass ribbon 9 than the outer circumferential blade 49 having a smaller diameter, and the outer circumferential blade 19, The peripheral speed difference can be generated between the end portions 9a of the glass ribbon 9 and the end portions 9a of the glass ribbon 9 to exert a strong tensile force toward the outside thereof.

(Example)

The molten glass having the viscosity characteristics shown in Fig. 5 was applied to a molding apparatus provided with 16 barrel heads shown in Fig. 1, and was made to have a width of about 90 inches (about 2.28 m) to about 120 inches (about 3.05 m) 0.3 mm glass ribbon was produced.

As for the inclination angle [theta] of each top roll, the reference barrel head of the first to fourth top rolls is stepwise inclined from 0 DEG to 15 DEG, and the fifth to tenth top The inclination angle &thetas; is set to 0 DEG by inclining the inclined angle with respect to the composite barrel head of the roll, and the inclination angle [theta] with respect to the reference barrel head of the eleventh to thirteenth rolls is 0 DEG Respectively.

For the sake of comparison, a test for producing glass ribbons using the reference barrel heads of two stages for all of the 16 top rolls and a test for producing the glass ribbons of the sixteen top rolls are shown in the fifth to tenth 2, and the other saw rolls were tested to produce glass ribbons using a reference barrel head.

The influence of the tensile force on the glass ribbon by the distance between the reference barrel head on the front end side and the barrel head on the rear end side in the composite barrel head was examined.

A composite barrel head in which the interval between the reference barrel head on the leading end side and the barrel head on the trailing end side is 7.5 inches and a composite barrel head having the same interval as 10 inches are respectively used and similarly to the above- Test.

The above results are shown in Fig. Fig. 7 shows the results of a computer simulation analyzed by the solver of the present invention. From the results shown in Fig. 7, it can be seen that, in all cases where a composite barrel head is used for the top roll in the middle region, the width of the wide glass It has been found that it is possible to produce ribbons.

In this respect, by providing the difference in the number of revolutions of the barrel head on the front end side of the composite barrel head and the barrel head on the rear end side and by forming the end portion of the glass ribbon while applying a force for pulling outward, Can be produced.

Subsequently, the number of pairs (double T / R number) in which the composite barrel heads were provided was changed to 0 to 7 pairs (in the case of 7 pairs, 14 pairs of left and right in total) for the top roll in the midstream region, (9) was produced, the test was performed on the plate width of each glass ribbon. In addition, a reference barrel head was used for all the top rolls in a position where the composite barrel head was not installed. The results are shown in Fig. 8 is a result of a computer simulation that is solved by the original solver.

As shown in Fig. 8, it has been found that the plate width of the glass ribbon 9 to be obtained can be increased as the number of composite barrel heads to be used is increased. The peripheral speed ratio of the inside and outside of the double T / R is 166%.

Subsequently, when 16 glass top rolls were used and glass ribbons were formed with a float bath, all 10 inch reference barrel heads were used, and from the first stage to the third top roll, the inclination angle of the reference barrel head ) Is inclined in a stepwise manner from 0 to 15 °, and inclination is given to the reference barrel head of the fourth to eighth top rolls by 12 to 15 °, The inclination angle [theta] of the reference barrel head of the top roll was gradually decreased and the inclination angle [theta] was set to 0 DEG with respect to the barrel head of the fourteenth and subsequent top rolls.

When the glass ribbons are formed as the reference barrel heads in all of the sixteen top rolls, the position of one end edge of the glass ribbon during molding from the center position of the float bath with respect to the longitudinal direction of the float bath is set as the standardized width from the center 9. Figure 9 is a result of a computer simulation interpreted by the original solver.

The line A1 in Fig. 9 shows the width of the glass ribbon obtained when the reference barrel head is used for the barrel heads of all the top rolls.

On the contrary, when the barrel head of all the top rolls is set as the reference barrel head and the inclination angle [theta] of all the reference barrel heads is 0 DEG, the width of the glass ribbon is greatly narrowed as shown by the A2 line. Also, all the 0 degrees in Fig. 9 means that the angle of the entire T / R is 0 deg..

In contrast, the fifth to tenth top rolls correspond to the double-headed combination barrel head shown in Fig. 2 (outer side (rear end side)) of the barrel head on the inner side And the number of revolutions was set to 140%) to form a glass ribbon. The results are shown by line A3 in Fig.

Further, with respect to the condition of the line A3, the inclination angle [theta] of the first to third top rolls was set at the inclination angle of the top roll of the A1 line, and the result of molding the glass ribbon was shown by the A4 line in FIG. .

Further, with respect to the condition of the A4 line, the inclination angle? After the fourth top roll was set to 50% of the inclination angle of the top roll of the A1 line (except for the top roll with the inclination angle of 0 °) ) The result of molding a glass ribbon is shown by line A5 in Fig.

Further, with respect to the condition of the A4 line, the inclination angle [theta] after the fourth top roll was set to 70% of the inclination angle of the top roll of the A1 line (except for the top roll with the inclination angle of 0 [ ) The result of molding the glass ribbon is shown by line A6 in Fig.

From the results shown in Fig. 9, it is understood that by using a top roll equipped with a double composite barrel head (the number of revolutions of the inner barrel head is set to 140% of the number of revolutions of the outer barrel head) The glass ribbon of the same width as that of the A1 line can be formed even if the glass ribbon is reduced in the range of 50% to 70% of the inclination angle? Of the glass ribbon.

From this test result, even if the inclination angle? Is reduced to 50% to 70% by replacing a part of the reference barrel head installed in the float bath with a composite barrel head of 4 to 5, It was found that it can be manufactured. Further, the inclination angle? Of the barrel head can be reduced to mean that the interference between adjacent top rolls can be reduced, which means that the interval between adjacent top rolls can be narrowed. When the adjacent top rolls are closely arranged, the glass ribbon having excellent flatness can be formed.

The present application is based on Japanese Patent Application No. 2012-093884 filed on April 17, 2012, the contents of which are incorporated herein by reference.

The technique of the present invention can be widely applied to an apparatus and a method for manufacturing a glass plate used for a display device glass, an optical glass, a medical glass, a construction glass, a vehicle glass, and other general glass products.

G: molten glass
1: Manufacturing apparatus (float bath)
2: Bathtub
3: molten metal
5:
6:
7: conveying roll
7A: Slow cooling line
8: Movement path
9: Glass ribbon
10: Glass ribbon
11: saw roll
11A 0 to 11A 15 : Top Roll (Edge Roll Device)
13:
13a: supply path (royal road)
13b: supply pipe
13c: return flow path (return path)
14: Composite barrel head
16: rotary drum
16b: hollow portion
16e: Mounting bolt
16h: protective cover
17:
17a: Supply path (forward path)
17b: supply pipe
17c: return flow path (return path)
18: Reference barrel head
20: rotary drum
20b: hollow portion
20h: protective cover
20e: Mounting bolt
30, 40: Combined barrel head
36:
36a: internal tube
36b: outer tube
36c and 36d:

Claims (21)

A float bath for accumulating molten metal and forming a movement path of the molten glass on the molten metal and for moving the molten glass from an upstream region to a downstream region of the movement path to form a glass ribbon; And a plurality of pairs of top rolls disposed on both sides in the width direction of the movement path from the upstream region to the downstream region of the movement path,
Wherein the top roll comprises a rotation shaft extending in the horizontal direction on both sides in the width direction of the movement path of the molten glass and a glass ribbon provided on the leading end side of the rotation shaft and conveyed from the upstream region to the downstream region along the movement path And a composite barrel head having a plurality of rows of outer circumferential edges rotated while being pressed against the end portions in the width direction,
Wherein the outer peripheral edge of the composite barrel head on the front end side and the outer peripheral edge of the rear end side of the composite barrel head are separately provided so as to be independently rotatable. The apparatus for manufacturing a glass plate according to claim 1, wherein the number of revolutions of the outer peripheral blade at the tip end side of the composite barrel head is set larger than the number of revolutions of the outer peripheral blade at the rear end side. The manufacturing apparatus of a glass plate according to claim 1, wherein a diameter of an outer peripheral edge on a tip end side of the composite barrel head is larger than a diameter of an outer peripheral edge on a rear end side. 4. The composite barrel head according to any one of claims 1 to 3, wherein the composite barrel head has a composite structure of a front end side barrel head having an outer peripheral edge and a rear end side barrel head having an outer peripheral edge, Wherein the rotary shaft of the distal end side barrel head is extended so as to penetrate through the rear end side rotary shaft and the rear end side barrel head after the end side rotary shaft has a hollow structure. The method of any one of claims 1 to 4, wherein an area having a logarithmic value of the viscosity of the glass ribbon is in a range of 5.29 to 6.37 dPa · s as an intermediate region of the movement path of the molten glass, Wherein the head is disposed. The apparatus for manufacturing a glass plate according to any one of claims 1 to 5, wherein a thickness of the glass ribbon formed by the float bath is 1 mm or less. The apparatus for producing a glass plate according to any one of claims 1 to 6, wherein as the molten glass, a non-alkali glass having the following composition is applied in the mass percentage based on oxide:
50 to 73% of SiO 2 ,
Al 2 O 3 : 10.5 to 24%
B 2 O 3 : 0 to 12%,
MgO: 0 to 8%
CaO: 0 to 14.5%,
SrO: 0 to 24%,
BaO: 0 to 13.5%
MgO + CaO + SrO + BaO: 9 to 29.5% and
ZrO 2 : 0 to 5%. The apparatus for producing a glass plate according to any one of claims 1 to 6, wherein as the molten glass, a non-alkali glass having the following composition is applied in the mass percentage based on oxide:
58 to 66% of SiO 2 ,
Al 2 O 3 : 15 to 22%
B 2 O 3 : 5 to 12%
MgO: 0 to 8%
CaO: 0 to 9%,
3 to 12.5% of SrO,
BaO: 0 to 2%
MgO + CaO + SrO + BaO: 9 to 18% and
ZrO 2 : 0 to 5%. The apparatus for producing a glass plate according to any one of claims 1 to 6, wherein as the molten glass, a non-alkali glass having the following composition is applied in the mass percentage based on oxide:
54 to 73% of SiO 2 ,
Al 2 O 3 : 10.5 to 22.5%
B 2 O 3 : 0 to 5.5%,
MgO: 0 to 8%
CaO: 0 to 9%,
SrO: 0 to 16%
BaO: 0 to 2.5% and
MgO + CaO + SrO + BaO: 8 to 26%. A manufacturing method of a glass plate for forming a glass ribbon by moving a molten glass along a moving path of a molten glass provided on a molten metal,
When a glass ribbon is produced by exerting an outward tensile force on both end portions of the glass ribbon by a plurality of pairs of top rolls disposed at both ends in the width direction of the movement path from the upstream region to the downstream region of the movement path,
Wherein the top roll has a barrel head for pulling outwardly while pressing the width direction end portion of the glass ribbon conveyed from the upstream region to the downstream region along the movement path,
Wherein the barrel head is a composite barrel head having a plurality of rows of outer circumferential blades in a cylindrical outer circumferential wall and rotating the outer circumferential blades while pressing the outer circumferential blades against the widthwise ends of the glass ribbon to apply a tensile force to the glass ribbon, The barrel head is provided so that the outer peripheral edge on the tip end side and the outer peripheral edge on the end side on the rear end thereof are independently rotatable independently,
The tensile force acting on the glass ribbon from the outer peripheral edge of the tip end side is made greater than the tensile force acting on the glass ribbon from the outer peripheral edge of the rear end side of the composite barrel head, Of the glass plate. The manufacturing method of a glass plate according to claim 10, wherein the composite barrel head is made to have a larger number of revolutions of the outer peripheral edge of the tip end side than that of the outer peripheral edge of the rear end side to exert a desired tensile force on the end of the glass ribbon . The composite barrel head according to claim 10, wherein the composite barrel head has a composite barrel head in which a diameter of an outer peripheral edge of a tip of the composite barrel head is larger than a diameter of an outer peripheral edge of a rear end of the composite barrel head, A method of manufacturing a glass plate. 13. The method according to any one of claims 10 to 12, wherein the region of the glass ribbon having a logarithm of the viscosity of 5.29 to 6.37 dPa.s is an intermediate region of the movement path of the molten glass, Is formed on the glass plate. The method for producing a glass plate according to any one of claims 10 to 13, wherein as the molten glass, an alkali-free glass having the following composition is used in the mass percentage based on oxide:
50 to 73% of SiO 2 ,
Al 2 O 3 : 10.5 to 24%
B 2 O 3 : 0 to 12%,
MgO: 0 to 8%
CaO: 0 to 14.5%,
SrO: 0 to 24%,
BaO: 0 to 13.5%
MgO + CaO + SrO + BaO: 9 to 29.5% and
ZrO 2 : 0 to 5%. The method for producing a glass plate according to any one of claims 10 to 13, wherein as the molten glass, an alkali-free glass having the following composition is used in the mass percentage based on oxide:
58 to 66% of SiO 2 ,
Al 2 O 3 : 15 to 22%
B 2 O 3 : 5 to 12%
MgO: 0 to 8%
CaO: 0 to 9%,
3 to 12.5% of SrO,
BaO: 0 to 2%
MgO + CaO + SrO + BaO: 9 to 18% and
ZrO 2 : 0 to 5%. The method for producing a glass plate according to any one of claims 10 to 13, wherein as the molten glass, an alkali-free glass having the following composition is used in the mass percentage based on oxide:
54 to 73% of SiO 2 ,
Al 2 O 3 : 10.5 to 22.5%
B 2 O 3 : 0 to 5.5%,
MgO: 0 to 8%
CaO: 0 to 9%,
SrO: 0 to 16%
BaO: 0 to 2.5% and
MgO + CaO + SrO + BaO: 8 to 26%. A frame roll device for producing float glass, which is provided on a float bath for forming a glass ribbon by supplying a molten glass onto molten metal, and exerts a tensile force in an outward direction at an end portion in the width direction of the glass ribbon,
And a composite barrel head provided at a distal end of the rotary shaft and having a plurality of outer peripheral blades in a cylindrical outer peripheral wall,
The plurality of rows of outer circumferential blades formed on the outer circumferential wall of the composite barrel head are outer circumferential blades that engage with the glass surface when the composite barrel head is pressed against the surface of the glass ribbon to exert a tensile force,
Wherein the outer peripheral edge of the outer peripheral side of the distal end side of the composite barrel head and the outer peripheral edge of the outer peripheral side of the rear end side of the composite barrel head are separately provided so as to be independently rotatable. The edge roll apparatus for producing float glass according to claim 17, wherein the number of revolutions of the outer peripheral edge on the tip end side of the composite barrel head is set larger than the number of revolutions of the outer peripheral edge on the rear end side. The edge roll apparatus for producing float glass according to claim 17, wherein the diameter of the outer peripheral edge on the tip end side of the composite barrel head is larger than the diameter of the outer peripheral edge on the rear end side. The composite barrel head according to any one of claims 17 to 19, wherein the composite barrel head has a composite structure of a front end side barrel head having an outer peripheral edge and a rear end side barrel head having an outer peripheral edge, Wherein the rotary shaft of the front end side barrel head is extended so as to penetrate through the rear end side rotary shaft and the rear end side barrel head after the rotary shaft at the end side is formed into a hollow structure. 21. The air conditioner according to any one of claims 17 to 19, wherein the front end side barrel head and the rear end side barrel head both have a hollow structure having a refrigerant flow path therein, and the front end side rotation shaft and the rear end side rotation shaft And the return path of the refrigerant at the distal end side rotary shaft is connected to the hollow portion of the front end side barrel head at the distal end portion of the rotary shaft at the distal end side, Wherein the coolant path of the refrigerant at the end side rotary shaft and the return passage are connected to the hollow portion of the rear end side barrel head at the end portion of the rear end side rotary shaft.
KR20147029124A 2012-04-17 2013-04-11 Device and method for producing glass sheet and edge-rolling device for producing float glass KR20150002677A (en)

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JPS535327B1 (en) * 1969-06-30 1978-02-25
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JP3083586B2 (en) * 1991-04-26 2000-09-04 旭硝子株式会社 Alkali-free glass
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