KR20180093739A - Method and system for heat treatment of low-emissivity glass - Google Patents

Abstract

Disclosed are a method and a system for heat treating low-E glass. The method for heat treating the low-E glass comprises the following steps: loading a glass plate onto one side of a transporting device, the glass plate having a metal film formed on one surface thereof; selectively performing a primary heat treatment on the surface of the metal film to at most a certain depth using microwaves having a first temperature, the primary heat treatment being performed in a first region along the transport direction from the one side of the transporting device toward the other side thereof; and selectively heat treating the metal film using a laser beam of a second temperature before or after performing the heat treatment using microwaves, the heat treatment using the laser beam being performed in a second region positioned before or after the first region along the transport direction. It is an object of the present invention to provide the method and the system for heat treating the low-E glass, which can effectively improve the radiation performance of low emissivity glass used in a window system while compensating for the disadvantages of the low-E glass by a conventional manufacturing method.

Description

TECHNICAL FIELD [0001] The present invention relates to a glass heat treatment method and system,

Embodiments of the present invention relate to a Roy glass heat treatment method and system.

Today, countries around the world are in the height of the oil price era and are hurry to select solutions for energy problems as their top priority and to prepare measures against them. One of the measures is to reduce energy consumption through technology that can reduce energy loss and increase efficiency in major energy use sectors such as industrial sites and buildings.

For buildings, windows and doors have thermal insulation properties that are about 8 to about 10 times lower than those of walls, so heat loss through windows accounts for about 25% to about 45% of total building heat loss Serious.

Therefore, LOW-Emissivity Glass is used to reduce the heat loss in the window. Royi glass has a structure in which a metal film having a high reflectance of infrared rays is coated on one side of an ordinary glass and has a single layer or a multi-layer structure. The metal film transmits the visible light to increase the light transmittance of the room and reflects the infrared rays to reduce the heat transfer inside and outside the room, thereby reducing the temperature change in the room.

Roy glass can be classified into hard low-E by a pyrolytic process and soft low-E by a sputtering process according to a coating preparation method.

In the hardroy manufacturing method, a metal solution or a metal powder is sprayed onto a plate glass to perform thermal coating in a process of manufacturing a flat plate glass. The coating material is usually a single material of a metal oxide (e.g., SnO ₂ ). The advantages of the conventional hardroy manufacturing method are that the hardness and durability of the coating are high due to thermal coating, so that heat treatment such as reinforcing processing is possible. However, there is a disadvantage that the use of various metals is limited, the color is simple, and the coating film is turbid.

On the other hand, the soft furnace production method is produced by coating a metal plate such as silver (Ag), titanium, stainless steel or the like with a multi-layer thin film coating of a plate plate glass of a separate vacuum chamber, . The advantages of the conventional soft-ray manufacturing method are high transparency, various colors can be realized through the use of various metals, and optical performance and thermal performance are excellent. However, there is a drawback in that the hardness and durability of the coating are poor when compared with the hardness, and a separate edge stripping treatment facility is required in the production of the double-layered glass.

As described above, there is a need for a new manufacturing technique for Roy glass that is improved in radiation performance by compensating for the disadvantages of current hard and low soft manufacturing methods.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a low-emissivity glass which can effectively improve the radiation performance of a low-emissivity glass used in a window system, And a glass heat treatment method and system.

According to an aspect of the present invention, there is provided a method of manufacturing a glass plate, comprising the steps of: loading a glass plate having a metal film on one side thereof on one side of a transfer device; And a step of selectively heat-treating the metal film using a microwave of the same.

In one embodiment, the heat treatment using the microwave may selectively heat up to a depth of 1 mu m from the surface of the metal film.

In one embodiment, the step of heat-treating using the microwave may heat the metal film in a temperature atmosphere of 200 ° C to 500 ° C.

In one embodiment, the frequency of the microwaves may be several GHz and the width of the microwaves may be between 10 cm and 15 cm.

In one embodiment, the metal film may include silver (Ag) as a main component.

In one embodiment, the conductivity of the metal film may be greater than the conductivity of copper (Cu) at the first temperature.

In one embodiment, the heat treatment method for Roy glass is characterized in that, before or after the heat treatment using the microwave, in a second region positioned in front of or behind the first region in the transport direction, And selectively heat-treating the metal film with a laser beam of a temperature. The second temperature may be higher than the first temperature, but is not limited thereto, and may be changed according to the arrangement relationship.

In one embodiment, the heat treatment with the laser beam may selectively heat the metal film to a depth of 1 mu m from the metal film surface with a line beam orthogonal to the transport direction.

In one embodiment, the heat treatment with the laser beam may heat the metal film in a temperature atmosphere of 500 ° C to 650 ° C.

In one embodiment, the low glass heat treatment method is characterized in that before the step of using the microwave or the heat treatment with the laser beam, the glass plate or the metal And further preheating the membrane.

According to another aspect of the present invention, there is provided a transfer apparatus for transferring a glass plate having a metal film formed on one surface thereof from one side thereof; And a microwave module installed in a first region in the transport direction from one side to the other side of the transfer device for discharging microwaves of a first temperature, wherein the microwave module comprises a furnace for selectively heat treating the metal film with the microwave, A glass heat treatment system is provided.

In one embodiment, the microwave module can selectively heat up to a depth of 1 mu m from the surface of the metal film. The microwave module may heat the metal film in a temperature atmosphere of 200 ° C to 500 ° C. The frequency of the microwave may be several GHz, and the width of the microwave may be 10 cm to 15 cm.

In one embodiment, the metal film may include silver (Ag) as a main component. A dielectric layer may be provided between the metal film and the glass plate.

In one embodiment, the heat treatment system of Roy Glass is characterized in that it is provided with a laser beam which is installed in a second region located in front of or behind the first region in the transport direction and which is selectively heat treated with a laser beam of a second temperature different from the first temperature And may further include a laser module.

In one embodiment, the laser module may heat the metal film with a line beam extending in a direction orthogonal to or crossing the transport direction and having a beam width of 1 mm or less.

In one embodiment, the laser module can heat the metal film in a temperature atmosphere of 500 ° C to 650 ° C.

In one embodiment, the Royle glass heat treatment system further includes a preheating device for preheating the glass plate or the metal film at a preheating temperature lower than the first temperature at a front end of the microwave module and the laser module based on the transport direction can do.

According to the embodiments of the present invention as described above, the radiation performance of the loi glass can be improved by selectively heating and treating the coating film of low-emissivity glass.

In addition, the metal film can be selectively heat-treated without damaging the metal film by instantaneous high-temperature heating under the condition that the glass is not broken. In addition, since the coating film is selectively heated, the temperature can be easily controlled and the large-area glass can be uniformly heat-treated.

In addition to the heating using microwaves, by further performing laser beam heating, preheating, or a combination thereof, surface selective heating using microwaves can be effectively applied to greatly improve the performance of Roy glasses and solve the existing problems in the manufacturing process .

That is, it is possible to solve the problem of the incapability of cutting the low-temperature glass produced during the heat treatment by the conventional hot air, and it is possible to solve the problem of difficulty in controlling the radiation performance. In addition, it is possible to reduce the lamp replacement cost incurred when using a conventional flash lamp and to improve the slow tact time or cycle time of the Roy glass. In addition, it is possible to prevent occurrence of glass discoloration occurring when using an existing electron beam, and to reduce a relatively high energy consumption.

1 is a schematic diagram of a low-emissivity glass heat treatment system according to an embodiment of the present invention.
FIG. 2 is a graph for explaining the operation principle of the microwave module used in the Roye glass heat treatment system of FIG.
3 is a ROI glass HR-TEM image for explaining the heat treatment performance of the microwave module of FIG.
4 is a cross-sectional view for explaining a glass plate for a low glass which can be employed in the low glass heat treatment system according to the embodiment of the present invention.
5 is a schematic block diagram of a Roye glass heat treatment system according to another embodiment of the present invention.
FIG. 6 is a schematic cross-sectional view of a preheater portion of a glass convection oven for explaining a part of the configuration of the Royer's glass heat treatment system of FIG. 5;
FIG. 7 is a view showing an operating state of a laser module that can be employed in a Royer's glass heat treatment system according to another embodiment of the present invention.
8 is a schematic cross-sectional view of a laser module portion for explaining the construction and operation principle of a laser module employed in the ROI glass heat treatment system of FIG.
FIG. 9 is a view showing a layout of a microwave module and a laser module that can be employed in a Royer's glass heat treatment system according to another embodiment of the present invention.
FIG. 10 is a flowchart for explaining a heat treatment method of a low glass according to another embodiment of the present invention.
11 is a graph for explaining the radiation performance of the Roy glass produced by the Roy glass heat treatment method of FIG.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing.

The terms first, second, A, B, etc. may be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms related to "comprising "," having ", and the like are intended to specify the presence of stated features, integers, steps, operations, elements, parts, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Also, in the present specification, when subscripts of certain characters have different subscripts, other subscripts of subscripts can be displayed in the same form as subscripts for convenience of display.

Unless otherwise defined herein, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted in a manner consistent with the contextual meaning of the related art, and are not to be construed as ideal or overly formal, unless explicitly defined herein.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic diagram of a low-emissivity glass heat treatment system according to an embodiment of the present invention.

Referring to FIG. 1, a royglas heat treatment system 100 according to the present embodiment includes a transfer device 20 and a microwave module 30. The ROI glass thermal processing system 100 may include a glass convection oven in which the microwave module 30 is installed or a chamber performing a corresponding function.

The transfer device 20 may be coupled to a glass convection oven or chamber so as to transfer the glass plate 10 from the outside to the inside of the oven or chamber and again from the inside to the outside. A metal film may be formed on one surface of the glass plate 10 in advance.

The metal film may be referred to as a roux coating layer, and the conductivity (or conductivity) of the metal film may be greater than the conductivity of copper (Cu) at a temperature (hereinafter referred to as a first temperature) at which the metal film is formed by the microwave. The metal film may be silver (Ag) or may contain silver (Ag) as a main component.

The glass plate 10 can be loaded at one side of the transfer device 20 and transferred to the other side of the transfer device 20 in the first direction D1, for example. The conveying device 20 may have a conveyor belt shape.

A loading zone Z0 of the glass plate 10 having a metal film formed on one surface thereof and a portion of the glass plate 10 loaded on the transfer device 20 are formed on the surface of the microwave module 30, And a part for unloading the glass plate 10 on which the crystallized metal film is formed from the transfer device 20 is referred to as an unloading zone Z6 .

The surface of the metal film on the glass plate 10 in the microwave zone Z2 can be selectively heated by the microwave 32 forming a temperature atmosphere of 200 to 500 占 폚. Here, the microwave module 30 can control the microwave 32 to heat the metal film to a depth of 1 mu m or less from the surface of the metal film.

The frequency of the microwave 32 may be several GHz and the width of the microwave 32 may be 10 cm to 15 cm. The longitudinal direction of the microwave 32 may be orthogonal to the first direction D1 and the width of the microwave 32 may be the wave width in the first direction D1.

The frequency and the width of the microwave 32 described above can be adjusted according to the conductivity of the metal film. For example, if the conductivity of the metal film is high, the conductivity at the surface of the metal film at the same frequency and temperature is high and can be heated at a relatively shallow depth. That is, in this embodiment, the microwave intensity, frequency, irradiation width, and the like can be determined so that the surface of the metal film can be selectively heated at a certain depth or less corresponding to a threshold at which the surface current of the metal film begins to decrease rapidly.

FIG. 2 is a graph for explaining the operation principle of the microwave module used in the Roye glass heat treatment system of FIG.

2, in the present embodiment, a metal film on a glass plate heated by a microwave module is irradiated with a constant surface current (hereinafter referred to as " (surface current).

This property can be an important factor in crystallizing the metal film by uniformly heat treating the large-area glass plate. That is, it can be used as a condition for rapid heating in a short time, which is sufficiently uniform to avoid damage or breakage of the glass layer so that the internal heat stress of the glass plate does not exceed the rupture coefficient of the glass. In this embodiment, the surface of the metal film is selectively heated to a depth of 1 탆 or less, preferably a depth shallower than 1 탆, on the surface of the metal film by using the microwave module. At this time, the metal film may be silver (Ag) or a material containing silver (Ag) as a main component.

The metal film may be made of a material selected from the group consisting of Copper, Gold, Chromium, Aluminum, Tungsten, Zinc, Brass, Nickel, Iron, Bronze, platinum, and the like. In this case, the conductivity of the metal film is usually lowered, and the heating depth of the surface of the metal film is increased under the same microwave surface selective heating condition. Therefore, in order to uniform heat treatment of the large-area glass plate, The microwave irradiation conditions such as the frequency and the wave width of the microwave can be adjusted.

3 is a ROI glass HR-TEM image for explaining the heat treatment performance of the microwave module of FIG.

The Royle glass heat treatment system according to this embodiment selectively heats the surface of the metal film on the glass plate by utilizing the property of microwave which has a high glass surface absorption rate.

A glass plate for use as a low glass can have a glass layer 11, a low-emissitivity layer, or a low-emissivity layer, as shown by a high resolution (HR) transmission electron microscopy (TEM) 12, and a metal layer 13. In this embodiment, the glass layer 11 may be referred to as a glass substrate and the metal layer 13 may be a platinum (Pt) layer.

As described above, in this embodiment, the metal film on the large-area glass plate for Roy glasses can be uniformly crystallized by using the property of microwaves having a high glass surface absorption rate.

In addition, since the depth of penetration by the surface selective heating decreases as the conductivity of the metal film becomes higher, a material containing silver (Ag) or silver (Ag) as a main component is used as the metal film in this embodiment, It is possible to control the surface penetration depth to be 1 탆 or less, thereby improving the heat treatment performance.

In addition, when laser processing / heat treatment is performed in the production of the Roy glass, the microwave heat treatment can be performed before the laser beam heat treatment to improve the efficiency of the laser processing / heat treatment.

4 is a cross-sectional view for explaining a glass plate for a low glass which can be employed in the low glass heat treatment system according to the embodiment of the present invention.

Referring to Fig. 4, the glass plate 10 according to the present embodiment can include a glass layer 11, a rooy layer 12 on a glass layer, and a metal film 13 on a rooy layer. The metal film 13 can be crystallized after the heat treatment. The ROI layer 12 may be formed of zinc oxide or the like, and the metal film 13 may be formed of silver (Ag).

The glass plate 10 may further include a first dielectric 14 between the glass layer 11 and the Roy layer 12. The first dielectric 14 may be formed of a material such as titanium oxide and may be referred to as a first dielectric layer.

The glass plate 10 may further include another ROI layer 15 on the metal layer 13 on the upper side of the glass layer 11 and a second dielectric 16 may be laminated on the other ROI layer 15, . The second dielectric 16 may be formed of a nitride film such as silicon nitride.

According to this embodiment, the metal film 13 can be effectively crystallized by using the microwave module, thereby improving the production efficiency of the low-temperature glass and improving the performance of the produced low-temperature glass. The performance of Roy glasses includes reflection performance.

5 is a schematic block diagram of a Roye glass heat treatment system according to another embodiment of the present invention.

Referring to FIG. 5, the Royer's glass heat treatment system 100A according to the present embodiment includes a transfer device 20, a microwave module 30, and a preheater 40. As shown in FIG. The Royer's glass heat treatment system 100A can enhance the effect of surface-selective heating of the metal film on the glass plate 10 by microwaves by preliminarily performing the preheating process.

The preheating device 40 may be disposed on one side of the transfer device 20. [ The portion where the preheating device 40 is disposed on the transfer device 20 or the portion where the preheating process is performed may be referred to as a preheater zone Z1. The preheating zone Z1 may be located next to the loading zone or overlap with most of the loading zone.

The preheating temperature may be lower than the temperature of the microwave heat treatment (first temperature). The preheating temperature may be about 200 ° C or less, and may be the temperature on the metal film.

The preheating device 40 may be installed with a hot air device, a heater, or the like. By using the preheating device 40, the entire glass plate 10 on which the metal film is formed can be heated. The preheating can be performed in various ways under the condition that the glass plate 10 is not broken. However, the preheating atmosphere and conditions are not particularly limited as long as the metal film is preheated to about 200 캜 before the microwave heat treatment.

The surface of the metal film on the glass plate 10 is selectively heated with the microwave 32 in the microwave zone Z2 after the preheating process and then the glass plate and the crystallized metal film are gradually cooled in the slow cooling zone Z4 .

FIG. 6 is a schematic cross-sectional view of a preheater portion of a glass convection oven for explaining a part of the configuration of the Royer's glass heat treatment system of FIG. 5;

Referring to FIG. 6, the Royer glass heat treatment system according to the present embodiment may include a glass convection oven. The glass convection oven may include a frame (80) and a chamber (90) secured on the frame (80). The chamber 90 may include a vacuum chamber.

A hot air device may be installed on the upper portion of the chamber 90. The hot air device may include a heater 43 and a pipe 43 for fluidly connecting the heater 41 and the blower 42 and the heater 41 and the blower 42 to the inner space of the chamber 90.

A transfer device may be coupled to the chamber 90. The conveying device includes a rotating shaft 22 passing through the chamber 90 in a direction perpendicular to the conveying direction of the glass plate 10, a roller 23 coupled to the rotating shaft 22, (Not shown). The motor 25 may be disposed on the outer surface of the chamber 90.

The above-described glass convection oven can be configured to be movable by a wheel installed at the lower end.

7 is a schematic diagram of a low-emissivity glass heat treatment system according to another embodiment of the present invention.

7, the Royer's glass heat treatment system 100H according to the present embodiment includes a transfer device 20, a microwave module 30 and a laser module 50, mirrors 61 and 62, and a camera 70 . The Royer's glass heat treatment system 100H is a system in which a metal film on a glass plate 10 is heat-treated with a microwave in a surface selective manner and then heat-treated with a laser beam by a surface selection method to effectively crystallize the metal film, Which greatly improves the emission performance of Roy glass.

The laser module 50 can operate so that the heat treatment temperature in the metal film is about 500 캜 to about 650 캜. The laser module 50 may irradiate the laser beam 52 in an inclined manner in the transport direction, but not limited thereto, the laser module 50 may irradiate the laser beam 52 in an inclined direction opposite to the transport direction of the glass plate 10. Of course, depending on the implementation, a plurality of laser modules may be used which respectively emit the laser beam in an inclined direction opposite to the transport direction and the transport direction.

Further, in order to increase the heat treatment efficiency by the laser beam 52, a mirror for reflecting the laser beam 52 back to the metal film on the glass plate 10 may be provided.

The mirror may include a first mirror 61 and a second mirror 62. The first mirror 61 is disposed under the glass plate 10 and can reflect the laser beam 52 passing through the glass plate 10 in the laser module 50. The second mirror 62 can reflect the laser beam reflected by the first mirror 61 back to the glass plate 10. [ According to such a reflection structure, the laser beam can pass through the glass plate 10 a plurality of times with a progress path of at least one zigzag shape.

The laser beam 52 may have a line beam shape that is parallel to the main surface or the upper surface of the glass plate 10 and extends in a direction perpendicular to the transport direction D1 of the glass plate 10. [ The use of a high-power large-line beam (laser beam) enables effective uniform heat treatment of large-area glass plates.

The camera 70 is for monitoring the crystallized metal film on the glass plate 10 passing through the slow cooling zone Z4. The camera 70 may be connected to the monitor of the monitoring system via a wired or wireless network as a part of the monitoring system.

The camera 70 and the monitor are not particularly limited as long as it is a means for confirming the state of the crystallized metal film or the heat treatment state of the glass plate 10 as a monitoring system or performing a function corresponding to such means.

The monitoring zone (Z5) may be referred to as a monitoring zone on the other side of the transfer device 20. [ At least a part of the monitoring zone Z5 may overlap with the unloading zone.

8 is a schematic cross-sectional view of a laser module portion for explaining the construction and operation principle of a laser module employed in the ROI glass heat treatment system of FIG.

Referring to FIG. 8, the laser module 50 employed in the Royer's glass heat treatment system according to the present embodiment can be constructed in consideration of the speed of the plate glass production line.

The laser module 50 may include a plurality of laser heads or may include a laser diode array. The laser module 50 may be spaced a predetermined distance L 1 from the glass plate 10. The spacing distance may be from about 250 mm to about 300 mm.

The laser beam 52 may have a shape in which the beam width of the laser beam 52 is increased from the laser module 50 to the glass plate 10 or the first mirror 61 in the longitudinal direction D2 of the line beam. The beam width of the line beam may be 1 mm.

The use of the line beam having the above-mentioned beam width is advantageous in uniformly performing selective heating of the metal film surface by the laser beam on a transfer device of a large glass plate having a constant production speed or a conveying speed. The conveying speed may be 50 mm / s to 150 mm / s.

FIG. 9 is a view showing a variation of a layout of a microwave module and a laser module that can be employed in a Royer's glass heat treatment system according to another embodiment of the present invention.

9, the Royer's glass heat treatment system 100K according to the present embodiment includes a transfer device 20, a microwave module 30 and a laser module 50, mirrors 61 and 62, and a camera 70 . The Royer's glass heat treatment system 100K crystallizes the metal film effectively by heat treating the metal film on the glass plate 10 through a laser module 50 in a surface selection manner and by a surface selection method through a microwave module 30, And greatly improves the radiation performance of the low glass including the metal film or the metal film.

The laser module 50 can operate so that the heat treatment temperature in the metal film is about 500 캜 to about 650 캜. The laser module 50 may irradiate the laser beam 52 in an inclined manner in the transport direction, but not limited thereto, the laser module 50 may irradiate the laser beam 52 in an inclined direction opposite to the transport direction of the glass plate 10. Of course, depending on the implementation, a plurality of laser modules may be used which respectively emit the laser beam in an inclined direction opposite to the transport direction and the transport direction.

As described above, according to the present embodiment, the heat treatment temperature of the metal film can be controlled by combining at least one or more of the microwave module 30 and the at least one laser module 50. According to this method, the metal film can be selectively heat-treated at a high temperature to enable efficient crystallization of the metal film.

FIG. 10 is a flowchart for explaining a heat treatment method of a low glass according to another embodiment of the present invention.

Referring to FIG. 10, in the method of heat treating a glass rod according to the present embodiment, in addition to a main process for selectively heating only a predetermined thickness portion of a surface of a metal film on a glass plate using a microwave module, a preheating process using a hot air device, A second selective surface heat treatment process using a laser beam may be further included.

In this embodiment, the description will be focused on the case where the preheating by hot air, the surface selective heat treatment by microwave, and the surface selective heat treatment by laser beam are performed in the described order.

First, the glass plate can be loaded on one side of the transfer device (S121). A metal film may be disposed on one surface of the glass plate. The metal film may be formed on the glass plate in advance by a method such as spraying, coating or sputtering. The transfer device can transfer the glass plate at a transfer speed of 50 mm / s to 150 mm / s.

Next, the surface of the metal film on the glass plate can be selectively heated to a depth of less than 1 占 퐉 by using a microwave in a microwave zone (S123). The metal film heated by the microwave can be crystallized.

Next, the surface of the metal film can be selectively heated by using a laser beam in a laser mirror zone (S124). The metal film heated by the laser beam can be crystallized.

Next, the glass plate or the metal film can be gradually cooled through the heat exchanger in the slow cooling zone (S125).

Next, a glass plate on which the crystallized metal film is formed (hereinafter referred to as Royer glass or Roye glass semi-finished product) can be unloaded from the transfer device (S126).

According to this embodiment, a metal film on a glass plate can be preheated by a hot air device, firstly heated by a microwave, and secondarily heated by a laser beam to produce a low glass having excellent radiation performance. That is, the metal film on the loose coating layer can be crystallized without damaging the loose coating layer by selective heating on the surface of the metal film on the glass plate.

Meanwhile, in the present embodiment, the step of selectively heat treating the surface of the metal film using microwaves (S123) is not limited to the step performed before the selective heat treatment of the metal film surface with the laser beam (S124) Can be performed after the heat treatment step using the beam. In this case, the temperature (second temperature) of the surface of the metal film by the laser beam based on the temperature (first temperature) of the surface of the metal film by microwave is higher than the first temperature in accordance with the arrangement relationship of the microwave module and the laser module . However, the temperature of the metal film surface by the laser module may be lower than the first temperature depending on the arrangement of the modules, the material of the metal film, the thickness, and other process conditions. In one example, a plurality of laser modules may be respectively installed at the front and rear of the microwave module, in which case the plurality of laser modules may be controlled to operate at different metal film surface temperatures.

In this embodiment, the glass plate, the metal film, or both of them are preheated in a preheating zone before the step of heat treatment (S123) using a microwave and the step of heat treatment (S124) And may further include a preheating step S122. In this case, when the metal film is rapidly heated at a relatively high temperature by a microwave module or a laser module, there is an advantage that thermal diffusion or heat dispersion of the metal film can be effectively assisted through preheating treatment.

11 is a graph for explaining the radiation performance of the Roy glass produced by the Roy glass heat treatment method of FIG.

The Roy glass heat treatment method (G1) according to this embodiment effectively crystallizes the metal film of the Roy glass by using the combined energy of the hot air for preheating, the microwave and the laser beam in the stated order under certain conditions, .

As shown in FIG. 11, the Roy glass heat treatment method (G1) of the present embodiment has an emissivity of about 28% at 500 ° C and about 36% at 650 ° C compared with the Roy Glass heat treatment method (G2) Can be improved.

On the other hand, as another conventional heat treatment method, an infrared lamp or hot air can be additionally used for laser processing, but in such a case, it is also difficult to obtain remarkable effects as in the case of this embodiment.

According to the rapid selective thermal processing (RSTP) method and system using the combined energy using the hot air and the microwave and the laser beam, it is possible to effectively heat the metal film of the low temperature glass at a temperature of 600 ° C. to 700 ° C. Thus, there is an advantage that the efficiency of the heat treatment process of the low-temperature glass can be enhanced, and the heat treatment of the uniform metal film of the glass can be easily achieved with a very high efficiency large-area without damaging the glass layer or the low-temperature layer. The ultra-high-efficiency large-area low-temperature glass may include a glass panel of 250 mm insulation, size 800 mm x 1600 mm or more.

Meanwhile, in the above-described embodiment, heat treatment using a microwave can be replaced by heat treatment by an induction heater using an induction coil or a mold insert. This induction heating method can perform surface selective heating in accordance with electrical resistivity or ralative magnetic permeability of the material instead of conductivity. Electrical resistivity can refer to the electrical resistance of a unit volume of an object or some object having a unit length. The relative permeability of the material can be calculated by dividing the permeability of the pure material by the permeability of the vacuum, with the relative permeability of copper as 1 as a reference.

In other words, the induction heating can be implemented so that the density of the magnetic flux lines (magnetic flux density) indicated by the number of lines of magnetic force perpendicularly passing through the unit area of the metal film is controlled to selectively heat the metal film to 1 m or less from the surface of the metal film. The induction heater for induction heating can be placed closer to the metal film than the microwave module.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims It can be understood that

Claims (18)

Loading a glass plate having a metal film on one surface thereof to one side of a transfer device;
Selectively heat-treating the metal film using a microwave of a first temperature in a first region in a transport direction from one side of the transfer device to the other side; And
Selectively heat-treating the metal film with a laser beam at a second temperature in a second region located at a front end or a rear end of the first region in the transport direction before or after the step of performing heat treatment using the microwave; , Roy glass heat treatment method. The method according to claim 1,
Wherein the heat treatment using the microwaves selectively heats up to 1 mu m in depth from the surface of the metal film. The method of claim 2,
Wherein the heat treatment using the microwave is performed by heating the metal film in a temperature atmosphere of 200 ° C to 500 ° C. The method of claim 3,
Wherein a frequency of the microwave is several GHz and a width of the microwave is 10 cm to 15 cm. The method of claim 4,
Wherein the metal film contains silver (Ag) as a main component. The method of claim 5,
Wherein the conductivity of the metal film is greater than the conductivity of copper at the first temperature. The method according to claim 1,
Wherein the heat treatment with the laser beam selectively heats up to 1 mu m in depth from the metal film surface with a line beam orthogonal to the transport direction. The method of claim 7,
Wherein the heat treatment with the laser beam is performed by heating the metal film in a temperature atmosphere of 500 ° C to 650 ° C. The method of claim 7,
Further comprising preheating the glass plate or the metal film to a preheating temperature lower than the first temperature in front of the first region in the transport direction before using the microwave or heat treating the laser beam, Roy glass heat treatment method. A transfer device for loading a glass plate having a metal film on one surface thereof from one side;
A microwave module installed in a first region in a transport direction from the one side to the other side of the transfer device and emitting a microwave at a first temperature; And
And a laser module disposed at a front end or a rear end of the microwave module,
Wherein the microwave module is configured to selectively heat-treat the surface of the metal film with the microwave,
Wherein the laser module selectively heat-treats the metal film with a laser beam at a second temperature in a second region located in the front or rear end of the first region in the transport direction. The method of claim 10,
Wherein the microwave module selectively heats up to 1 mu m in depth from the surface of the metal film. The method of claim 11,
Wherein the microwave module heats the metal film in a temperature atmosphere of 200 ° C to 500 ° C. The method of claim 12,
Wherein the frequency of the microwave is several GHz and the width of the microwave is 10 cm to 15 cm. 14. The method of claim 13,
Wherein the metal film comprises silver (Ag) as a main component. 15. The method of claim 14,
And a dielectric layer is provided between the metal film and the glass plate. The method of claim 10,
Wherein the laser module heats the metal film with a line beam extending in a direction orthogonal to or crossing the conveying direction and having a beam width of 1 mm or less. 18. The method of claim 16,
Wherein the laser module heats the metal film in a temperature atmosphere of 500 ° C to 650 ° C. 18. The method of claim 17,
Further comprising a preheating device for preheating the glass plate or the metal film at a preheating temperature lower than the first temperature at the front end of the microwave module and the laser module based on the transport direction.

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