KR100510196B1 - Continuous type fusion furnace system for frit production - Google Patents

Abstract

The present invention relates to a continuous frit melting furnace, and more particularly, in a continuous frit melting system consisting of a raw material supply device, a melting furnace, a heating means and a molding device, the melting furnace is made of a general metal material, the refrigerant is to be heat exchanged It has a double-walled structure of a jacket type that can enter and exit, and has an open boat shape at the top, and includes a receiving portion capable of receiving and melting powder frit raw material and blocking the flow of unmelted frit raw material. A dam wall connected across both upper ends of the part, a discharge port disposed in the distal upper end portion of the accommodating part and discharging the molten glass, and a tilting means capable of tilting at a predetermined angle with respect to the ground. The continuous frit melting system of the present invention, unlike the conventional melting system It is possible to produce high-purity frit economically by preventing the mixing of pure water, to manufacture bismuth (Bi) frit with strong reducibility, to prevent the sleeve of the raw material input device from being clogged with the raw material, and separate discharge device It is possible to automatically discharge the completely molten glass by the dose without

Description

Continuous frit melting system {CONTINUOUS TYPE FUSION FURNACE SYSTEM FOR FRIT PRODUCTION}

The present invention relates to a continuous frit melting furnace, and more particularly, in a continuous frit melting system consisting of a raw material supply device, a melting furnace, a heating means, and a molding device, the melting furnace is made of a general metal material, and the refrigerant is heat-exchangable. It has a double-walled structure of a jacket type that can enter and exit, and has an open boat shape at the top, and includes a receiving portion capable of receiving and melting powder frit raw material and blocking the flow of unmelted frit raw material. A dam wall connected across the upper both ends of the part, a discharge port disposed in the distal upper end of the receiving part to discharge the molten glass, and a tilting means capable of tilting at a predetermined angle with respect to the ground. A frit melting system.

Frit is a powder glass with very strong adhesion and excellent mechanical strength and chemical durability. Frit, which exhibits adhesion at relatively low temperatures, is used as a joint material between glass and glass, glass and ceramics, ceramics and ceramics, and metals and metals. In particular, barrier ribs, dielectrics, electrode materials, encapsulants or vacuum fluorescence displays (VFD), cathode ray tubes (CRTs), backlight units (BLUs), and field emission displays of plasma display panels (PDPs). The frit used as a sealant in the manufacture of modules such as (FED), ceramic color frits used for printing on glass bottles and ceramics, is required to be of low melting point and high purity.

In the conventional continuous frit manufacturing apparatus, a raw material is introduced into a container manufactured by assembling a ceramic refractory block using a raw material feeder, heated and melted using a gas burner or electricity, and then the bottom glass from which bubbles are generated during melting is removed. A pipe made of platinum was sucked and sent to a molding machine to prepare a frit. The refractory material is inexpensive, has high heat resistance at high temperatures, and has a higher corrosion resistance level than that used in general glass manufacturing. However, since the frit composition has low melting point, low viscosity and very strong erosion property unlike a general glass composition, erosion of the refractory is severe. Usually, upon melting of a frit with a softening point of 350 ° C., a 40 cm thick refractory erodes to 10 cm after 3 months. The erosion of the refractory causes the components of the refractory to enter the frit to change the frit composition, and thus the furnace using refractory blocks is not suitable for high quality frit production. The low viscosity of the molten frit can lead to accidents such as leaking and explosion of molten glass through the refractory block gap. In addition, the melting furnace using a refractory block also has a problem in that productivity is lowered because it is necessary to stop the operation for several ten days and replace the refractory for maintenance after the operation for one to two years.

In order to solve the problem of the refractory block smelting furnace, the smelting furnace itself was made of platinum, a noble metal having high temperature corrosion resistance, or was made of platinum on the refractory inner wall. In this case, the risk of accidental leakage of the melt frit is reduced. However, since platinum itself is very expensive, the initial production cost is high, and the corrosion resistance of platinum melting furnace is 20% in 3 months even though the corrosion resistance is better than that of refractory materials. Erosion does not solve the problem of erosion, and maintenance costs are very high. In addition, platinum is easily damaged in a reducing atmosphere, so there is a problem in that it is not applicable to the production of bismuth (Bi) frit glass.

On the other hand, a skull melting (skull melting) melting furnace has also been used in a batch type (semi-batch type) melting furnace that is not continuous. U.S. Patent No. 3,937,625 discloses a glass manufacturing apparatus using a radio wave heat source device in a water-cooled silica crucible. In addition, Korean Patent Laid-Open Publication No. 2002-0038727 discloses a crucible wall formed by a ring of metal tubes that can be connected with a coolant and having pores between adjacent tubes, a crucible bottom through which the melt is discharged, and a crucible wall to cover high frequency energy. A sleeve installed for discharge with an inlet end protruding into the inner chamber of the skull crucible such that the induction coil and melt, which can be coupled to the crucible contents by means of, are removed from the crystallized bottom layer in a controlled manner without loss of quality. A skull crucible is disclosed. The skull crucible disclosed in this document is said to be capable of continuous operation, but it is not suitable for continuous production of large quantities of the molten furnace in which the melt is to be moved from top to bottom, and it is necessary to use platinum or quartz sleeves. If the initial cost of the facility is quite high and the frit is produced, there is a problem that it is not free from erosion or breakage. In addition, the high frequency generator used as a heat source is expensive and is in the center of a fully melted glass crucible, which causes various problems in discharging.

Therefore, the technical problem to be achieved by the present invention, unlike the conventional melting system, it is possible to economically produce a high-purity frit by preventing the mixing of impurities, it is possible to manufacture a bismuth (Bi) -based frit with strong reducibility, raw material input It is possible to prevent the inlet of the apparatus from being clogged with raw materials, and to provide a continuous frit melting system capable of automatically discharging the completely melted glass by the input amount without a separate discharge device.

In order to achieve the above technical problem, the present invention is a continuous frit melting system consisting of a raw material supply device, a melting furnace, a heating means and a molding apparatus, the melting furnace is a general metal material, the refrigerant can enter and exit to enable heat exchange The jacket-type double-walled structure has an open boat shape at the top, and includes an accommodating part for accommodating and melting powder frit raw material, and an upper end of the accommodating part to block the flow of unmelted frit raw material. A continuous frit melting system having a dam wall connected to the transverse portion, an outlet for discharging molten glass positioned at an upper end of the receiving portion, and a tilting means at a lower angle with respect to the ground; to provide.

The present invention also provides a continuous frit melting system, characterized in that the dam wall is one to three.

In addition, the present invention provides a continuous frit melting system, characterized in that the dam wall is located in the range corresponding to one fifth to five fifths of the total length from the tip to the end of the receiving portion.

The present invention also provides a continuous frit melting system, characterized in that the tilting means is a gear or a hydraulic cylinder.

In addition, the present invention provides a continuous frit melting system, characterized in that the outlet is cooled to form a solidified glass layer on the surface.

In another aspect, the present invention provides a continuous frit melting system characterized in that the surface temperature of the receiving portion is cooled to maintain the range of 0.05 to 0.2 times the melting point of the frit.

In another aspect, the present invention provides a continuous frit melting system, characterized in that the heating means is an electric heating device spaced apart from the top of the melting furnace.

The present invention also provides a continuous frit melting system, characterized in that the raw material supply device is provided with a cooling sleeve.

Hereinafter, the present invention will be described in more detail with reference to examples which are preferred embodiments of the present invention. However, the following examples are merely to help the understanding of the present invention, the scope of the present invention is not limited only to the following examples.

Continuous frit melting system 100 of the present invention includes a raw material supply device 10, the melting furnace 20, the heating means 30 and the molding device (40). 1 is a cross-sectional view for schematically illustrating a continuous frit melting system of the present invention. Since the continuous frit melting system 100 of the present invention is a method of supplying the raw material and the production of the finished product continuously, the raw material supply device 10, the melting furnace 20, the heating means 30 and the molding device 40 The form shall be suitable for the continuous production method. In addition, including a general temperature sensor, a flow meter and a control system, etc. will be apparent to those of ordinary skill in the art will not be described in detail herein.

Continuous frit melting system 100 of the present invention is a general metal material, has a jacket-type double wall structure that allows the refrigerant to enter and exit to allow heat exchange, the boat-shaped melting furnace 20 of which the top is open It includes. As described above, unlike the conventional continuous frit melting system using a melting furnace made of refractory or a noble metal platinum, the continuous frit melting system 100 of the present invention is a general metal material and the refrigerant flows in and out to enable heat exchange. It is a jacket-type double wall structure, and applies the boat-shaped melting furnace 20 of which the top is open. In the present specification, 'general metal' means a relatively low-cost industrial metal material except expensive precious metals such as platinum, gold, and silver. Examples of the general metal material of the melting furnace 20 may be stainless steel, iron, copper, etc., if the material does not react with the frit raw material or the melt frit is not particularly limited. Although frit has a lower softening point and melting point than ordinary glass, it is considered impossible to use ordinary metal materials in continuous melting furnaces because the temperature of the molten glass (frit melt) generally exceeds 1,000 ° C. However, in the present invention, by applying the jacket-type double wall structure melting furnace 20 that allows the refrigerant to enter and exit, the solidification of the same components as the molten glass on the surface of the receiving portion 21 contacting the molten glass (the frit melt) Solving the above problems by forming a glass layer (solidified glass, 24) can be applied to the melting furnace of the general metal material. The refrigerant is not particularly limited, and water is most preferable in consideration of economical efficiency and heat capacity. As described above, the skull melting method has already been used in a batch-type glass melting furnace, but not in the continuous glass such as the present invention, particularly in frit melting furnaces where purity is important. The reason is not clear, but the study results of the present inventors were found to be related to the shape of the melting furnace, the composition and input method of the raw material and the heating means. By using the continuous melting furnace 20 of the above-mentioned method, unlike the conventional melting system, it is possible to economically produce high-purity frit by preventing the incorporation of impurities, and also to produce a bismuth (Bi) -based frit having strong reducing properties. .

The melting furnace 20 has a receiving portion 21 for receiving and melting powder frit raw material, and a dam wall 22 connecting across upper ends of the receiving portion to block the flow of unmelted frit raw material. And, it is characterized in that it is provided with a tilting means 25 which can be inclined at a predetermined angle with respect to the ground discharge port 23 and the lower portion is located in the upper end of the receiving portion discharging the melt frit. 2 is a perspective view of one embodiment of a melting furnace 20 according to the continuous frit melting system 100 of the present invention. As can be seen in Figure 2, the melting furnace 20 has a receiving portion 21 for receiving and melting the frit raw material continuously supplied from the raw material supply device 10. The shape of the accommodation portion 21 is not particularly limited, and may be a boat-shaped recessed inner surface as shown in FIG. 2. Surface temperature of the receiving portion 21 is characterized in that the cooling to maintain the range of 0.05 to 0.2 times the melting point of the frit. The surface of the accommodating portion 21 is cooled by the refrigerant, and thus the molten glass contacting the surface of the accommodating portion 21 is solidified again to form the solidified glass layer 24. In this case, the thickness of the solidified glass layer 24 formed is closely related to the thermal efficiency of the melting system 100. If the solidified glass layer 24 is formed to be too thin (that is, insufficient cooling) it is easily broken even by the impact inside the melting furnace 20 to change the composition of the melt frit in the melting furnace 20 and the melting furnace 20 itself On the other hand, if the solidified glass layer 24 is formed to an excessively thick thickness (ie, overcooled), the melt volume of the melting furnace 20 is relatively reduced, so that the melting furnace 20 must be made large. In addition, there is a problem that the heat transfer from the melt is increased, the thermal efficiency of the melting system 100 is lowered. Therefore, the surface temperature of the receiving portion 21 should be adjusted to be maintained at an appropriate level. As a result of the study of the present inventors, it was found that the surface temperature of the accommodating part 21 is preferably cooled in such a way that the melting temperature of the frit is maintained in the range of 0.05 to 0.2 times in terms of stable operation and thermal efficiency of the melting furnace 20.

Since the frit raw material supplied from the raw material supply device 10 is generally supplied in the form of a powder, it is necessary to prevent the frit raw material from being discharged to the molding apparatus 40 in an unmelted state. Thus, the melting furnace 20 is provided with a dam wall 22 connected across the upper both ends of the receiving portion 21 to block the flow of unmelted frit raw material. Since the unmelted frit raw material has a specific gravity lower than that of the molten glass (frit melt), the dam wall 22 must be located above the receiving portion 21 because the melt is suspended on the glass and flows with the flow of the melt. In order to completely block the discharge of the unmelted frit raw material, the dam wall 22 is preferably plural, and most preferably, the dam wall 22 is one to three. In addition, the dam wall 22 is preferably located at a position corresponding to the range of one fifth to five fifths of the entire length from the front end to the end of the accommodation portion 21. The front end of the receiving portion 21 means a portion adjacent to the raw material supply device 10 and the end means a portion having a discharge port (23). When the dam wall 22 is installed at a position less than one fifth from the tip end based on the total length of the accommodating part 21, the unmelted frit raw material may overflow beyond the dam wall 22 and 4/5 This is because there may be rocking of the molten glass in the outlet 23 if it is installed in an excess position.

The discharging port 23 for discharging the melting frit is provided at the upper end of the melting furnace 20. The shape of the outlet 23 is not particularly limited, as long as the molten glass can overflow as shown in FIG. 2 and naturally fall into the molding apparatus 40. The outlet 23 may be cooled to form a solidified glass layer 24 on the surface similarly to the accommodating part 21. The outlet 23 may be cooled by a method of manufacturing the outlet 23 in a jacket type having a double wall structure to allow the refrigerant to enter and exit in the same manner as the accommodating part 21. Preferably, it is preferable from the viewpoint of economics that the double wall structure of the accommodation portion 21 extends to the outlet 23 so that the cooling lines are common. Unlike the conventional melting system that had to apply the outlet of the precious metal platinum material, the continuous frit melting system 100 of the present invention is cooled to form a solidified glass layer 24 in the outlet 23, the general metal material It is possible to apply.

In addition, the melting furnace 20 has a tilting means 25 that can be inclined at a predetermined angle with respect to the ground at the bottom thereof. The tilting means 25 adjusts the melting furnace 20 to be inclined at a predetermined angle with respect to the ground, thereby controlling the retention time of the frit staying in the melting furnace 20. In frit production, the time the molten glass stays in the melting furnace may vary depending on the composition of the frit. In order to extend or shorten the residence time, there may be a method of adjusting operating conditions such as feed rate of raw materials or using a separate melting furnace. In the present invention, by adjusting the inclination of the melting furnace 20 by using the tilting means 25, even in the case of using the same melting furnace, it is possible to adjust the production amount by varying the residence time. 1 is a cross-sectional view for schematically illustrating a continuous frit melting system of the present invention. As shown in FIG. 1, in the continuous frit melting system of the present invention, the melting furnace 20 is grounded using the tilting means 25. It can be inclined at a predetermined angle with respect to. Preferred examples of the tilting means 25 may include a gear or a hydraulic cylinder.

Continuous frit melting system 100 of the present invention is characterized in that the heating means 30 is an electric heating device spaced apart from the top of the melting furnace. In general, a gas burner, a plasma torch, an electric heating device or an electrode is used as a heating means used for glass melting, including frit, and the most common form is a gas burner. The continuous frit melting system 100 of the present invention preferably uses an electric heating device which is spaced apart from the above heating means by the heating means 30 above the melting furnace. By using the electric heating device, there is no combustion gas and fugitive dust generated when using the gas burner to prevent environmental pollution, and because it is located at the top of the melting furnace, unlike the electrode directly contacting the melt, problems such as abrasion occur. Therefore, it is possible to manufacture a low viscosity frit containing a large amount of heavy metal and a high purity chemical composition frit such as a PDP partition or a dielectric which is not allowed to be mixed with foreign substances.

Continuous frit melting system 100 of the present invention may be provided with a cooling sleeve 11 in the raw material supply device (10). In the continuous frit melting system 100, the raw materials are also continuously supplied. The sleeve, which is usually the raw material discharge passage, is generally located in close proximity to the melting furnace, and the powder frit raw material is often melted in the sleeve and blocks the sleeve due to the heat transmitted from the melting furnace and the heating means. Accordingly, the continuous frit melting system 100 of the present invention has a cooling sleeve 11 to cool the sleeve itself to prevent the powder frit raw material from melting in the sleeve. The cooling sleeve 11 may be a jacket type of a double wall structure such as a melting furnace, or may be a form in which a cooling water coil is wound around a conventional sleeve.

The method of making a frit using the continuous frit melting system of the present invention is outlined as follows. First, the melting furnace 20 is adjusted to have a predetermined angle with respect to the ground by using the tilting means 25 below the melting furnace 20 according to the characteristics of the frit to be manufactured, and then the receiving of the melting furnace 20 before full-scale heating. The portion 21 is filled with the cullet of the same material as the frit, the refrigerant is circulated and preliminarily heated up. This is to prevent the metal melting furnace 20 from being directly exposed to high temperature and to be damaged, and to form a solidified glass layer 24 having a predetermined thickness on the surface of the receiving portion 21. After the preliminary heating process is completed, the powder frit raw material is continuously added at a predetermined speed through the raw material input device 10. The injected raw material is melted before reaching the dam wall 22, and gas is removed and flows through the lower portion of the dam wall 22 to the outlet 23. The fully melted frit moves to the molding machine 40 through the outlet 23 and the molten glass discharged from the molding machine 40 is cooled and crushed as it passes between a pair of rotating rollers cooled by a refrigerant to form a frit semi-finished product. Ribbon cuts are made.

As described above, the continuous frit melting system of the present invention, unlike the conventional melting system can prevent the incorporation of impurities to produce a high-purity frit economically, it is possible to manufacture a bismuth (Bi) -based frit strong In addition, the sleeve of the raw material input device can be prevented from being clogged with the raw material, and the fully melted glass can be automatically discharged by the input amount without a separate discharge device.

An embodiment of the present invention described above and illustrated in the drawings should not be construed as limiting the technical spirit of the present invention. The protection scope of the present invention is limited only by the matters described in the claims, and those skilled in the art can change and change the technical idea of the present invention in various forms. Therefore, such improvements and modifications will fall within the protection scope of the present invention, as will be apparent to those skilled in the art.

1 is a cross-sectional view for schematically illustrating a continuous frit melting system of the present invention.

Figure 2 is a perspective view of one example of the melting furnace according to the continuous frit melting system of the present invention

 <Brief description of the major reference numerals>

10 Feeder 11 Cooling Sleeve

20 Melting Furnace 21 Receptacle

22 Damwall 23 Outlet

24 Solidified glass layer 25 Tilting means

30 Heating means 40 Molding apparatus

100 continuous frit melting system

Claims (8)

In the continuous frit melting system comprising a raw material supply device, melting furnace, heating means, discharge means and forming apparatus, The melting furnace is a general metal material, has a jacket-type double wall structure through which refrigerant can enter and exit to allow heat exchange, and has an open boat shape at the top, and accommodates and melts a frit raw material of powder. And a dam wall connecting the upper both ends of the accommodating portion to block the flow of the unmelted frit raw material, an outlet for discharging the molten glass located at the distal upper end of the accommodating portion, and the lower portion at a predetermined angle with respect to the ground. Continuous frit melting system characterized by having a tilting means that can be tilted. The method of claim 1, The dam wall is a continuous frit melting system, characterized in that 1 to 3. The method of claim 2, The dam wall is a continuous frit melting system, characterized in that located in the range of 1/5 to 5/5 of the total length from the tip to the end of the receiving portion. The method of claim 2, The tilting means is a continuous frit melting system, characterized in that the gear or hydraulic cylinder. The method of claim 2, And said outlet is cooled to form a solidified glass layer on its surface. The method of claim 2, Surface temperature of the receiving portion is continuous frit melting system, characterized in that cooling to maintain a range of 0.05 to 0.2 times the melting point of the frit. The method of claim 2, The heating means is a continuous frit melting system, characterized in that the electric heating device which is spaced apart from the top of the furnace. The method according to any one of claims 1 to 7, Continuous feed frit system characterized in that the raw material supply device has a cooling sleeve