KR20210001523A - Apparatus and method for manufacturing float glass - Google Patents

Abstract

An embodiment according to one aspect of the present invention provides a float glass manufacturing apparatus. An embodiment according to another aspect of the present invention provides a float glass manufacturing method for manufacturing float glass using the float glass manufacturing apparatus. The apparatus includes: a tub accommodating a molten metal so that a glass ribbon floats up; a ceiling wall disposed above the tub; a casing disposed above the ceiling wall and forming a space with the ceiling wall; heaters inserted into and passing through the through hole of the ceiling wall; and a gas supply pipe provided on the casing for gas supply to the space. The ceiling wall is divided into regions including at least three regions along the width direction of the glass ribbon in a longitudinal section over a predetermined length in the flow direction of the glass ribbon. The gap between the heater and the through hole is wider in another region than in the outermost region constituting the regions.

Description

Float glass manufacturing apparatus and method TECHNICAL FIELD [APPARATUS AND METHOD FOR MANUFACTURING FLOAT GLASS}

The present invention relates to a float glass manufacturing apparatus and a float glass manufacturing method.

The float glass manufacturing apparatus includes a bathtub for accommodating a molten metal from which a glass ribbon rises, a ceiling wall disposed above the bathtub, a casing forming a space between the ceiling wall, and a through hole of the ceiling wall. It has a plurality of heaters.

On the other hand, the float glass manufacturing apparatus supplies gas to form an inert atmosphere above the bathtub, but does not supply gas at the same flow rate per unit area over the entire width of the glass ribbon depending on the molding conditions of the glass ribbon.

Float glass manufacturing apparatus according to the prior art, in order not to supply gas with the same flow rate per unit area over the entire width of the glass ribbon, by arranging a plurality of partitions along the width direction of the glass ribbon in the space between the ceiling wall and the casing. A plurality of spaces were formed, and the gas supply flow rate was differently adjusted for each of the plurality of spaces.

However, in this case, gas supply pipes of a quantity corresponding to a plurality of spaces had to be arranged for each casing part in the space, and if the partition is not firmly fixed, it is difficult to maintain and manage the facility due to the inclination or damage of the partition. There was a problem I was having.

The present invention was conceived to solve the above-described problem, and without arranging a plurality of partitions along the width direction of the glass ribbon in the space between the ceiling wall and the casing, the supply of gas flow rate per unit area over the entire width of the glass ribbon is provided. It is intended to provide a float glass manufacturing apparatus and a float glass manufacturing method that can be different.

However, the problem to be solved by the present invention is not limited to the above-mentioned problems, and other problems that are not mentioned will be clearly understood by those skilled in the art from the following description.

An embodiment according to an aspect of the present invention, a bath for accommodating the molten metal so that the glass ribbon rises; A ceiling wall disposed above the bathtub; A casing disposed above the ceiling wall to form a space between the ceiling wall; A plurality of heaters inserted into the through-holes of the ceiling wall; and a gas supply pipe provided on the casing to supply gas to the space; wherein the ceiling wall has a predetermined length in the flow direction of the glass ribbon Is divided into a plurality of regions including at least three regions along the width direction of the glass ribbon in a length section spanning the range, and a gap between the heater and the through hole is wider in a region other than the outermost region among the plurality of regions. , To provide a float glass manufacturing apparatus.

In the present exemplary embodiment, the gap between the heater and the through hole may be narrower toward both sides from the center of the ceiling wall in the width direction.

In this embodiment, partitions may not be arranged between the ceiling wall and the casing along the width direction of the glass ribbon.

In this embodiment, the quantity of the gas supply pipes provided in the length section may be less than the quantity of the plurality of areas.

In this embodiment, the gas supply pipe may be disposed closer to the center portion than both sides of the casing in the width direction.

An embodiment according to another aspect of the present invention provides a float glass manufacturing method for manufacturing a float glass using the float glass manufacturing apparatus.

In this embodiment, the forming region of the glass ribbon is divided into upstream heat, midstream heat, and downstream heat in the flow direction of the glass ribbon based on the viscosity distribution of the glass ribbon, and at least one of the upstream heat and the downstream heat Is divided into a central part and both sides based on the width direction of the glass ribbon, and the ceiling wall has a gap between the heater and the through hole in at least one of the upstream row and the downstream row is the width of the ceiling wall Since it is formed to become narrower from the center of the direction reference to both sides, the gas flow rate per unit area supplied to at least one of the upstream heat and the downstream heat may increase from both sides of the forming area of the glass ribbon toward the center.

According to an embodiment of the present invention, without disposing a plurality of partitions along the width direction of the glass ribbon in the space between the ceiling wall and the casing, the gas flow rate per unit area is varied over the entire width of the glass ribbon, and the glass ribbon Can improve the flattening of.

Accordingly, it is possible to reduce the number of gas supply pipes that supply gas to the glass ribbon, and since the partition is not used, manpower and costs for maintenance and management of the partition can be reduced.

1 is a cross-sectional view showing a float glass manufacturing apparatus according to an embodiment of the present invention.
2 is a cross-sectional view taken along line II-II of FIG. 1.
3 is a cross-sectional view taken along line III-III of FIG. 1.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention will become apparent with reference to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms different from each other, and only these embodiments make the disclosure of the present invention complete, and common knowledge in the technical field to which the present invention pertains. It is provided to completely inform the scope of the invention to those who have it, and the invention is only defined by the scope of the claims. Meanwhile, terms used in the present specification are for explaining embodiments and are not intended to limit the present invention. In this specification, the singular form also includes the plural form unless specifically stated in the phrase. As used in the specification, "comprises" and/or "comprising" refers to the presence of one or more other components, steps, actions and/or elements, and/or elements, steps, actions and/or elements mentioned. Or does not preclude additions. Terms such as first and second may be used to describe various components, but the components should not be limited by terms. The terms are only used for the purpose of distinguishing one component from another component.

1 is a cross-sectional view showing an apparatus for manufacturing a float glass according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1, and FIG. 3 is a cross-sectional view taken along line III-III of FIG. .

The float glass manufacturing apparatus 100 supplies molten glass onto the molten metal M in the bathtub 40, and shapes the plate-shaped glass ribbon G. The glass ribbon G gradually hardens while floating on the molten metal M and flowing. The glass ribbon G is separated from the molten metal M in the downstream region of the bathtub 40 and is conveyed toward the slow cooling furnace.

The float glass manufacturing apparatus 100 includes a spout lip 10, a twill 20, a bathtub 40, a ceiling wall 50, a casing 60, an upper roll 70, a heater 80, and a gas supply pipe 90. ) Can be included.

The spout lip 10 supplies molten glass with a flow rate corresponding to the interval with the twill 20 to the bathtub 40.

The bathtub 40 accommodates the molten metal M from which the glass ribbon G floats. The molten metal (M) may be, for example, molten tin or molten tin alloy, but is not limited thereto. The liquid level of the molten metal M, as shown in Figs. 2 and 3, has a covered portion covered with the glass ribbon G, and an exposed portion that is not covered with the glass ribbon G. The exposed portion is formed on both left and right sides of the covering portion. The bathtub 40 may be made of, for example, a brick.

The ceiling wall 50 is disposed above the bathtub 40 as shown in FIG. 1 to cover the upper space 41 of the bathtub 40. A reducing gas or an inert gas may be supplied from the through hole 50a of the ceiling wall 50 to the upper space 41 of the bathtub 40 to prevent oxidation of the molten metal M. As the reducing gas, a mixed gas of nitrogen gas and hydrogen gas may be used, for example.

The casing 60 forms a space between the ceiling wall 50 (hereinafter, the inner space of the casing 60). The reducing gas or inert gas is supplied to the inner space of the casing 60 through the gas supply pipe 90, and then supplied to the upper space 41 of the bathtub 40 through the through hole 50a of the ceiling wall 50. Can be. The gas supply pipe 90 may be provided on the casing 60 to supply a reducing gas or an inert gas to the inner space of the casing 60. The inner space of the casing 60 may be divided into a plurality of unit spaces 61a, 61b, 61c, and 61d by arranging the partitions 62 along the flow direction of the glass ribbon G. The amount of gas supplied and the type of gas can be changed for each of the plurality of unit spaces 61a, 61b, 61c, and 61d.

As shown in FIG. 2, the upper roll 70 can apply tension to the glass ribbon G in the width direction by supporting both ends in the width direction over a predetermined section of the glass ribbon G. Thereby, shrinkage in the width direction of the glass ribbon G is restricted, and it can shape|mold into the thin glass ribbon G.

The upper roll 70 may be disposed on both ends of the glass ribbon G in the width direction, and may be disposed in plurality at intervals in the flow direction of the glass ribbon G. The arrangement area of the upper roll 70 along the flow direction of the glass ribbon G may be within an area where the viscosity at the center of the width direction of the glass ribbon G is 10 ^4.5 dPa·s to 10 ^7.5 dPa·s. have.

As shown in Fig. 1, the heater 80 is inserted into the through hole 50a of the ceiling wall 50, protrudes downward from the ceiling wall 50, and can heat the glass ribbon G. .

The plurality of heaters 80 are controlled for each zone, and different controllers may be used for each zone. The controller may be implemented in various forms such as a circuit board for controlling the heater 80, an integrated circuit chip, a series of computer programs mounted on hardware, firmware, software, etc., according to embodiments.

The ceiling wall 50 may be divided into a plurality of regions including at least three regions along the width direction of the glass ribbon G in a length section spanning a predetermined length in the flow direction of the glass ribbon G. Here, the length section may be a section corresponding to at least one of the plurality of unit spaces 61a, 61b, 61c, and 61d in the casing 60. In this embodiment, as shown in FIG. 3, the plurality of regions is illustrated in a form including a central region 51 and both side regions 52 and 53, a total of three regions.

It is preferable that the gap between the heater 80 and the through hole 50a is wider in the other region 51 than in the outermost regions 52 and 53 of the plurality of regions 51, 52 and 53. In the present embodiment, the gaps d2 and d3 between the heater 80 and the through hole 50a in both regions 52 and 53 are the heater 80 and the through hole 50a in the central region 51 It may be wider in the gaps d1a and d1b between.

In a state in which the flow of molten glass is constant, the molten glass gathers on the side of the central portion of the glass ribbon G in the width direction, while the amount of the molten glass is small and tends to become thick, so that the heater 80 and the heater 80 in the central region 51 By making the gaps d1a and d1b between the through holes 50a wider than the gaps d2 and d3 between the heater 80 and the through holes 50a in both regions 52 and 53, the gas flow rate per unit area is advantageous. By making it larger in the center of the ribbon (G) than on both sides in the width direction of the ribbon (G), the molten glass that collects in the center of the width direction of the glass ribbon (G) spreads well to both sides, so that it spreads over the entire width of the glass ribbon (G) The thickness can be flattened.

It is preferable that the gap between the heater 80 and the through hole 50a becomes narrower from the central part of the ceiling wall 50 in the width direction to both sides. For example, the size of the gap between the heater 80 and the through hole 50a may be formed in the following order.

-Gap size between heater 80 and through hole 50a: d1a> d1b> d2 = d3

In this way, if the gap between the heater 80 and the through hole 50a is formed to gradually narrow from the central part in the width direction of the ceiling wall 50 to both sides, the gas flow rate per unit area supplied to the glass ribbon G is also advantageous. The flowability of the glass ribbon G is further stabilized because it can be gradually increased from both sides of the ribbon G in the width direction to the center, and the quality of the final glass product can also be further improved in terms of flattening.

In this embodiment, it is preferable that partitions are not arranged along the width direction of the glass ribbon G between the ceiling wall 50 and the casing 60. In this embodiment, the gas supply flow rate may vary in different regions in the width direction of the upper space 41 of the bathtub 40 due to the gap between the heater 80 and the through hole 50a, which is different depending on the region. This is because there is no need to separately form a plurality of spaces along the width direction between the ceiling wall 50 and the casing 60. As a result, waste of manpower and costs for maintenance management due to the use of a plurality of partitions can be prevented.

In this embodiment, the quantity of the gas supply pipe 90 provided in the length section may be less than the quantity of the plurality of areas 51, 52, and 53. For example, as shown in FIG. 3, the number of the plurality of regions 51, 52, and 53 may be three, whereas the number of gas supply pipes 90 may be two.

Partitions are not arranged along the width direction of the glass ribbon G, that is, the internal unit spaces 61a, 61b, 61c, and 61d of the casing 60 along the width direction of the glass ribbon G are converted into a plurality of spaces. Since it is not formed, there is no need to adjust the gas supply flow rate for each of these spaces.

In this embodiment, the gas supply pipe 90 is preferably disposed closer to the central portion (C) than to both sides (O) in the width direction of the casing (60). For example, the distance L2 between both sides O of the casing 60 in the width direction and the gas supply pipe 90 is less than the distance L2 between the central part C and the gas supply pipe 90 in the width direction of the casing 60. The distance L1 can be made shorter.

The gap d1 between the heater 80 and the through hole 50a in the central region 51 is the gap d2 and d3 between the heater 80 and the through hole 50a in both regions 52 and 53 ), the gas consumption flow rate per unit time in the central space (S1) in the casing 60 is higher than the gas consumption flow rate per unit time in both spaces (S2, S3), so the gas supply pipe (90) is casing (60) By arranging it in the central part (C) of the casing 60, the remaining amount of gas in the central space S1 and the remaining amount of gas in both spaces S2, S3 can be maintained.

Hereinafter, a method of manufacturing a float glass using the float glass manufacturing apparatus 100 according to the embodiment will be described with reference to FIGS. 1 to 3.

The float glass manufacturing apparatus 100 may include a step of forming a plate-shaped glass ribbon G by supplying molten glass onto the molten metal M in the bathtub 40. The glass ribbon G gradually hardens while floating on the molten metal M and flowing. The glass ribbon G is separated from the molten metal M in the downstream region of the bathtub 40 and is conveyed toward the slow cooling furnace.

In this embodiment, the forming region F1 of the glass ribbon G is in the flow direction of the glass ribbon G based on the viscosity distribution of the glass ribbon G, the upstream heat (a), the midstream heat (b), It is divided into a downstream row (c), and at least for an upstream row (a) and a downstream row (c), in the width direction of the glass ribbon, the central part (a1; c1) and both sides (a2, a3; c2, c3) are divided. I can.

For example, the upstream row (a) of the forming area (F1) of the glass ribbon (G) is a section where the glass ribbon (G) is generally widened to the maximum width, and the viscosity of the glass ribbon (G) is 10 ^3.8 dPa S to 10 ^5.3 dPa·s, and the downstream heat (c) of the molding region F1 of the glass ribbon G is a section in which the width of the glass ribbon G is contracted, G) This glass ribbon G may have a viscosity of 10 ^5.7 dPa·s to 10 ^7.5 dPa·s.

The ceiling wall 50 includes a central region 51 and both sides 52 along the width direction of the glass ribbon G in at least one length section of the upstream row (a) and the downstream row (c) of the forming area F1. , 53).

In the ceiling wall 50, the gap between the heater 80 and the through hole 50a in at least one of the upstream heat (a) and the downstream heat (c) of the shaping area F1 is at both side areas 52 and 53 ) May be formed wider in the central region 51 than in ). Preferably, the gap between the heater 80 and the through hole 50a in at least one of the upstream heat (a) and the downstream heat (c) of the forming region F1 is in the width direction of the ceiling wall 50 It may be formed to become narrower from the reference center to both sides.

Through this, the gas flow rate per unit area supplied to at least one of the upstream heat (a) and the downstream heat (c) gradually increases from both sides of the forming area (F1) of the glass ribbon (G) to the center. The flowability of (G) is further stabilized, through which the quality of the glass ribbon (G) and the final glass product can also be improved in terms of planarization.

According to the embodiment of the present invention, the gap between the heater 80 and the through hole 50a is wider in the other area 51 than in the outermost area 52, 53 of the plurality of areas 51, 52, 53. Therefore, without disposing a plurality of partitions along the width direction of the glass ribbon G in the space between the ceiling wall 50 and the casing 60, the gas flow rate per unit area is supplied over the entire width of the glass ribbon G Differently, it is possible to improve the flattening of the glass ribbon (G).

Accordingly, it is possible to reduce the number of gas supply pipes 90 supplying gas to the glass ribbon G, and since the partition is not used, manpower and costs for maintenance management of the partition can be reduced.

Although the present invention has been described in connection with the above-mentioned preferred embodiments, it is possible to make various modifications or variations without departing from the spirit and scope of the invention. Accordingly, the scope of the appended claims will include such modifications or variations as long as they fall within the gist of the present invention.

100: float glass manufacturing apparatus
10: Spout Lip
20: Twill
40: bathtub
50: ceiling wall
50a: through hole
60: casing
70: upper roll
80: heater
90: gas supply pipe

Claims (7)

A bathtub containing molten metal so that the glass ribbon rises;
A ceiling wall disposed above the bathtub;
A casing disposed above the ceiling wall to form a space between the ceiling wall and the ceiling wall;
A plurality of heaters inserted into the through holes of the ceiling wall; and
Includes; a gas supply pipe provided on the casing to supply gas to the space,
The ceiling wall is divided into a plurality of regions including at least three regions along the width direction of the glass ribbon in a length section spanning a predetermined length in the flow direction of the glass ribbon,
A gap between the heater and the through hole is wider in an area other than an outermost area among the plurality of areas. The method of claim 1,
The gap between the heater and the through hole is narrower toward both sides from the center part in the width direction of the ceiling wall. The method of claim 1,
Float glass manufacturing apparatus to prevent the partitions are arranged along the width direction of the glass ribbon between the ceiling wall and the casing. The method of claim 3,
The quantity of the gas supply pipe provided in the length section is less than the quantity of the plurality of areas, float glass manufacturing apparatus. The method of claim 4,
The gas supply pipe is disposed closer to the center portion than both sides of the casing in the width direction reference, float glass manufacturing apparatus. A float glass manufacturing method for manufacturing a float glass using the float glass manufacturing apparatus according to any one of claims 1 to 5. The method of claim 6,
The forming region of the glass ribbon is divided into upstream heat, midstream heat, and downstream heat in the flow direction of the glass ribbon based on the viscosity distribution of the glass ribbon, and for at least one of the upstream heat and the downstream heat, the glass ribbon It is divided into a central part and both sides based on the width direction,
The ceiling wall is formed such that a gap between the heater and the through hole in at least one of the upstream and downstream rows becomes narrower from the central part in the width direction of the ceiling wall toward both sides, so that the upstream row And a gas flow rate per unit area supplied to at least one of the downstream heat is increased from both sides of the forming region of the glass ribbon toward the center.

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