WO2015056599A1

WO2015056599A1 - Production method for vacuum multilayer glass

Info

Publication number: WO2015056599A1
Application number: PCT/JP2014/076759
Authority: WO
Inventors: 隆之柏; 佳佑加藤
Original assignee: 旭硝子株式会社
Priority date: 2013-10-18
Filing date: 2014-10-07
Publication date: 2015-04-23
Also published as: JP2016210627A

Abstract

A production method for vacuum multilayer glass, having: a step in which a first glass substrate having a frame-shaped first bonding layer, a second glass substrate having a frame-shaped second bonding layer, and a frame-shaped metal box are prepared; a step in which the metal box is arranged upon the first glass substrate and a first assembly is prepared, said metal box being arranged at an inner peripheral position or an outer peripheral position so as to be in contact with the first bonding layer; a step in which the first assembly is heat treated and the metal box is fixed upon the first glass substrate; a step in which the second glass substrate is arranged on the metal box side of the first assembly, and a second assembly is prepared; and a step in which the second assembly is held in a reduced-pressure environment and the second glass substrate is bonded to the first assembly via the second bonding layer.

Description

Method for producing vacuum double-glazed glass

The present invention relates to a method for producing a vacuum double-glazed glass.

A so-called “vacuum double-glazed glass” having a gap held between a pair of glass substrates at a low pressure or in a vacuum state has an excellent heat insulating effect, and thus, for example, a window glass for buildings such as buildings and houses. Widely used in applications.

Vacuum multi-layer glass is manufactured as follows. First, a first glass substrate and a second glass substrate are prepared. A bonding layer is formed on the surface of one glass substrate along the periphery. Next, the first and second glass substrates are laminated so that both are opposed to each other through the bonding layer to form an assembly. Next, this assembly is heated to melt and soften the bonding layer and bond both glass substrates. Thereby, a gap is formed between the two glass substrates. Next, the inside of the gap is decompressed using an opening provided in advance in the first glass substrate. Then, the opening utilized for the decompression process is sealed, and a vacuum double-glazed glass is manufactured (Patent Document 1).

Japanese Patent Laid-Open No. 10-2161

As described above, in the conventional method for manufacturing a vacuum double-glazed glass, the step of decompressing the inside of the gap of the assembly using the opening provided in the glass substrate and the step of sealing the subsequent opening are performed. included.

However, although such a manufacturing method can be carried out by the so-called “batch type”, it is difficult to carry out by the “flow type”. That is, the conventional manufacturing method is not suitable for continuously manufacturing the vacuum double-glazed glass in a flow operation on a production line or the like. For this reason, from the viewpoint of production efficiency, there is a demand for a technique for manufacturing a vacuum double-glazed glass in a vacuum chamber.

By the way, some vacuum double-glazed glass includes metal foil in the surrounding sealing structure. In this sealing structure, a frame-shaped metal foil is interposed between the first bonding layer installed around the first glass substrate and the second bonding layer installed around the second glass substrate. It is comprised by letting.

However, when vacuum multilayer glass having such a sealing structure is to be manufactured by the “flow method”, for example, the second glass substrate is replaced with the first glass substrate in order to evacuate the gap in the vacuum chamber. However, when the first and second bonding layers are melted and softened by heating and the first and second glass substrates are bonded to each other, “Position shift” occurs.

This problem will be described in more detail with reference to FIG.

FIG. 1 shows a state in which the first and

second glass substrates

110 and 120 are heated and bonded together in a vacuum chamber.

As shown in FIG. 1, when the first and

second glass substrates

110 and 120 are bonded to each other in the vacuum chamber, first, the first glass substrate 110 having the first bonding layer 170 in the vacuum chamber. The second glass substrate 120 having the frame-shaped metal foil 160 and the second bonding layer 180 is prepared. For example, the second glass substrate 120 is formed of the first glass substrate 110 and the frame shape by a supporting member. An assembly 101 is formed that is maintained away from the metal foil 160. At this stage, the metal foil 160 is disposed at a position 160A (broken line) indicated by a broken line in FIG.

Next, in order to melt and soften the first bonding layer 170 and the second bonding layer 180, when the assembly 101 is heated, a gap between the first and

second glass substrates

110 and 120 and the metal foil 160 is obtained. Due to the difference in thermal expansion, the metal foil 160 is displaced with respect to the first and

second bonding layers

170 and 180. That is, the metal foil 160 is stretched toward the outside (right direction in FIG. 1) by heating, and the metal foil 160 is positioned as shown by a position 160B (solid line) in FIG. 1 so as to follow this behavior. Moves outward.

When the first and

second glass substrates

110 and 120 are overlapped and bonded to each other in a state where such a positional deviation has occurred in the metal foil 160, the metal foil 160 and the first and

second bonding layers

170 and 180 are bonded together. And the sealing member 150 arranged in a desired positional relationship cannot be formed. In particular, when this behavior becomes remarkable, there arises a problem that the metal foil 160 does not come into contact with the first bonding layer 170 on the lower surface, and the seal member 150 itself cannot be formed.

Therefore, when manufacturing the vacuum double-glazed glass by the “flow method” as described above, it is considered that it is necessary to establish a process in which the displacement of the metal foil hardly occurs.

The present invention has been made in view of such a background. In the present invention, when a vacuum double-layer glass is manufactured by a “flow method”, the metal foil constituting the seal structure is unlikely to be displaced. It aims at providing the manufacturing method of layer glass.

In the present invention, there is provided a method for producing a vacuum multi-layer glass comprising a decompressed gap between a first glass substrate and a second glass substrate facing each other,
(A) a first glass substrate having first and second surfaces, having a frame-shaped first bonding layer on the first surface, and third and fourth surfaces; Providing a second glass substrate having a frame-shaped second bonding layer on the surface thereof, and a frame-shaped metal foil;
(B) disposing the metal foil on the first surface of the first glass substrate to form a first assembly, wherein the metal foil is at an inner peripheral position or an outer peripheral position; A step arranged to contact one bonding layer;
(C) heat-treating the first assembly to fix the metal foil on the first glass substrate;
(D) disposing the second glass substrate on the metal foil side of the first assembly to constitute a second assembly, wherein the second glass substrate is Two bonding layers are arranged in a non-contact state with respect to the first assembly, and the third surface is disposed on the metal foil side;
(E) carrying the second assembly into a vacuum chamber to form a joined body, the second assembly being held in a decompressed environment, and then the second joining layer being Bonding the second glass substrate to the first assembly via:
(F) unloading the joined body from the vacuum chamber;
A method for producing a vacuum double-glazed glass is provided.

Here, in the manufacturing method according to the present invention,
In the step (a), there are two frame-shaped first bonding layers,
In the step (b), the metal foil may be disposed so as to be in contact with the first bonding layer at both an inner peripheral position and an outer peripheral position.

The manufacturing method according to the present invention further includes:
(G) After the step (f), the method may include a step of cutting the joined body such that the joining layer inside the first joining layer and the second joining layer remain. .

Moreover, in the manufacturing method according to the present invention, the bonding layer may have a vitrified layer.

The present invention can provide a method for producing a vacuum double-glazed glass that is less likely to be displaced in the metal foil constituting the seal structure when the vacuum double-glazed glass is produced by the “flow method”.

It is the figure which showed schematically the subject at the time of heating the 1st and 2nd glass substrate within a vacuum chamber, and joining both. It is sectional drawing which showed typically an example of the structure of the vacuum multilayer glass which can be manufactured with the manufacturing method of this invention. It is the figure which showed the mode at the time of heating the 1st and 2nd glass substrate within a vacuum chamber, and joining both by one Example of this invention. It is the flowchart which showed schematically the manufacturing method of the vacuum multilayer glass by one Example of this invention. It is the figure which showed schematically the aspect in a certain process of the manufacturing method of the vacuum multilayer glass by one Example of this invention. It is the figure which showed schematically the aspect in a certain process of the manufacturing method of the vacuum multilayer glass by one Example of this invention. It is the figure which showed schematically the aspect in a certain process of the manufacturing method of the vacuum multilayer glass by one Example of this invention. It is the figure which showed schematically the aspect in a certain process of the manufacturing method of the vacuum multilayer glass by one Example of this invention. It is the flowchart which showed schematically another manufacturing method of the vacuum double layer glass by one Example of this invention. It is the figure which showed schematically the aspect in a certain process of another manufacturing method of the vacuum multilayer glass by one Example of this invention. It is the figure which showed schematically the aspect in a certain process of another manufacturing method of the vacuum multilayer glass by one Example of this invention. It is the figure which showed schematically the aspect in a certain process of another manufacturing method of the vacuum multilayer glass by one Example of this invention. It is the figure which showed schematically the aspect in a certain process of another manufacturing method of the vacuum multilayer glass by one Example of this invention. It is the figure which showed schematically the aspect in a certain process of another manufacturing method of the vacuum multilayer glass by one Example of this invention.

Hereinafter, the present invention will be described with reference to the drawings.

(About the structure of the vacuum double-layer glass)
First, with reference to FIG. 2, an example of the structure of the vacuum double-layer glass that can be produced by the production method of the present invention will be briefly described.

FIG. 2 schematically shows an example of the structure of the vacuum double-glazed glass.

As shown in FIG. 2, the vacuum double-glazed glass 100 includes a first glass substrate 110, a second glass substrate 120, a gap 130 formed between the two

glass substrates

110, 120, and the gap And a seal member 150 surrounding the portion 130.

The first glass substrate 110 has a first surface 112 and a second surface 114. In the vacuum multi-layer glass 100, the first glass substrate 110 is disposed so that the second surface 114 side is the outside. Similarly, the second glass substrate 120 has a third surface 122 and a fourth surface 124. In the vacuum double-glazed glass 100, the second glass substrate 120 is disposed such that the fourth surface 124 side is the outside. Accordingly, the gap 130 is formed between the first surface 112 of the first glass substrate 110 and the third surface 122 of the second glass substrate 120.

The inside of the gap 130 is maintained in a vacuum state. In the present application, the term “vacuum state” is a concept that includes a low pressure (decompression) state in addition to a high vacuum state. The degree of vacuum of the gap 130 is not particularly limited, and may be any pressure lower than atmospheric pressure. In general, the pressure in the gap 130 is about 0.2 Pa to 0.001 Pa.

If necessary, the vacuum multilayer glass 100 may have one or more spacers 190 in the gap 130.

The seal member 150 is a member for hermetically holding the gap portion 130, and the seal member 150 is configured around the gap portion 130.

2, the seal member 150 includes a metal foil 160, a first bonding layer 170, and a second bonding layer 180.

The first bonding layer 170 is provided in a “frame shape” around the first glass substrate 110 on the first surface 112 side of the first glass substrate 110. Similarly, the second bonding layer 180 is provided in a “frame shape” around the second glass substrate 120 on the third surface 122 side of the second glass substrate 120.

In the present application, the term “frame shape” means a general term for a shape composed of a “frame” having an outer contour and an inner contour, with the inside of a flat plate shape removed in plan view. However, the outer contour and / or inner contour of the “frame-shaped” member is not necessarily limited to a substantially rectangular parallelepiped shape such as a forehead. For example, a triangular shape, a substantially triangular shape, a trapezoidal shape, a substantially trapezoidal shape, a pentagonal shape, a substantially pentagonal shape, etc. It may be a polygonal shape as well as a circular, substantially circular, substantially circular, elliptical, or substantially elliptical shape. Further, the outer contour and the inner contour of the “frame-shaped” member are not necessarily similar, and both may be different shapes, for example.

Similarly, the metal foil 160 has a frame shape. A part of the first surface 162 of the metal foil 160 is bonded to the first bonding layer 170 on the first glass substrate 110, and a part of the second surface 164 of the metal foil 160 is the second. The second bonding layer 180 on the glass substrate 110 is bonded.

Here, although it is not clear from FIG. 2, the first surface 162 of the metal foil 160 is not joined to other members at a place other than the joined portion joined to the first joining layer 170. The second surface 164 of the metal foil 160 is not joined to another member at a place other than the joined portion joined to the second joining layer 180.

In the example of FIG. 2, when the vacuum double-glazed glass 100 is viewed from the top (thickness direction: Z direction in FIG. 2), the first bonding layer 170 is displaced from the second bonding layer 180. The first bonding layer 170 is disposed on the inner side of the second bonding layer 180. However, this is an example, and the first bonding layer 170 may be disposed outside the second bonding layer 180.

Further, in the example of FIG. 2, the metal foil 160 has a “step” shape with a contour that is linearly bent when viewed in cross section. However, the shape of the metal foil 160 is not particularly limited. For example, when viewed in cross section, the metal foil 160 may have a curved shape, or a contour composed of a combination of straight lines and curves. Alternatively, the metal foil 160 may have a substantially flat shape when viewed in cross section.

The vacuum double-glazed glass 100 provided with such a sealing member 150 can significantly suppress the influence of deformation due to thermal stress due to the deformability of the metal member 160. For example, even when a temperature difference occurs between the first glass substrate 110 and the second glass substrate 120 during use of the vacuum multilayer glass 100, the first glass substrate 110 of the metal member 160 is first. Due to the deformability in the direction parallel to the surface 112 (X direction in FIG. 2), the influence of the difference in thermal expansion between the two

glass substrates

110 and 120 can be reduced. Therefore, a vacuum double-glazed glass that is hardly affected by deformation is obtained.

By the way, when it is going to manufacture the vacuum multilayer glass 100 provided with such a sealing member 150 by a "flow system", in order to make a gap | interval part into a vacuum in a vacuum chamber, for example, a 2nd glass substrate is made into 1st. The first and second bonding layers 170 and 180 are melted and softened by heating, and the first and

second glass substrates

110 and 120 are mutually connected. At the time of joining, the “position shift” is likely to occur in the metal foil 160.

On the other hand, in the method for manufacturing a vacuum double-layer glass according to the present invention, as described in detail later, before the step of bonding the first and second glass substrates to each other in the vacuum chamber, The metal foil is previously fixed to the first bonding layer at the inner peripheral position or the outer peripheral position.

For this reason, even if the assembly is heated in the vacuum chamber, the position of the metal foil relative to the first bonding layer does not change, and misalignment between the metal foil and the first and second bonding layers hardly occurs. Become.

This effect will be described with reference to FIG.

FIG. 3 schematically shows a state in which the first and

second glass substrates

110 and 120 are heated and bonded together in a vacuum chamber according to an embodiment of the present invention.

According to an embodiment of the present invention, when the first and

second glass substrates

110 and 120 are bonded to each other in a vacuum chamber, first, on the first glass substrate 110 having the first bonding layer 170, Metal foil 160 is placed so as to have a predetermined positional relationship. For example, in the example illustrated in FIG. 3, the metal foil 160 is disposed on the glass substrate 110 such that the first bonding layer 170 is disposed on the inner peripheral side of the metal foil 160 when viewed from above. .

Next, the first assembly thus obtained is heated and cooled, and the first bonding layer is melted and solidified. As a result, the metal foil 160 is bonded to the first glass substrate 110 via the first bonding layer 170. Here, when heating the first assembly, a weight is placed on the metal foil 160, and a pressing pressure is applied from above. For this reason, the metal foil 160 does not deform (thermally expand) during heating.

Next, in order to bond the first and

second glass substrates

110 and 120 to each other in the vacuum chamber, a first assembly (that is, the first glass substrate 110 to which the metal foil 160 is bonded), and a second The glass substrate 120 is laminated in a vacuum chamber to form the second assembly 102. At this stage, the metal foil 160 is disposed at a position (broken line) indicated by a broken line in FIG.

Next, when the second assembly 102 is heated to melt and soften the second bonding layer 180, the difference in thermal expansion between the first and

second glass substrates

110 and 120 and the metal foil 160. As a result, the metal foil 160 extends outward (to the right in FIG. 3) as indicated by the arrows in FIG.

However, in the case of the second assembly 102, the metal foil 160 is bonded to the first bonding layer 170 in advance. For this reason, even if the 2nd assembly 102 is heated within a vacuum chamber, the position with respect to the 1st joining layer 170 of the metal foil 160 does not change. Further, even when the metal foil 160 extends outward, the problem that the metal foil 160 does not come into contact with the second bonding layer 180 does not occur.

As a result, after the second assembly 102 is heated, a seal member in which the metal foil 160 and the first and second bonding layers 170 and 180 are arranged in a predetermined positional relationship can be formed.

As described above, in the method for manufacturing a vacuum double-layer glass according to the present invention, even when manufactured by the “flow method”, the metal foil is unlikely to be displaced, and the metal foil and the first and second bonding layers are in a predetermined state. It is possible to form seal members arranged in a positional relationship.

Note that FIG. 3 shows an example in which the first bonding layer 170 is disposed on the inner peripheral side of the metal foil 160 and the second bonding layer 180 is disposed on the outer peripheral side of the metal foil 160 as viewed from above. The effect of the invention has been described. However, the same effect can be obtained even when the first bonding layer 170 is disposed on the outer peripheral side of the metal foil 160 and the second bonding layer 180 is disposed on the inner peripheral side of the metal foil 160 in a top view. It will be clear that it is obtained. In the case of this configuration, the metal foil 160 extends inward when the assembly is heated. However, also in this case, the problem that the metal foil 160 does not come into contact with the second bonding layer 180 can be significantly avoided.

(Constituent members of vacuum double-glazed glass)
Next, the constituent members will be briefly described by taking the vacuum double-glazed glass 100 shown in FIG. 2 as an example.

(Glass substrate 110, 120)
The composition of the glass constituting the

glass substrates

110 and 120 is not particularly limited. The glass of the

glass substrates

110 and 120 may be, for example, soda lime glass and / or alkali-free glass.

Further, the composition of the first glass substrate 110 and the second glass substrate 120 may be the same or different.

(Metal foil 160)
The type of the metal material that constitutes the metal foil 160 is not particularly limited. The metal foil 160 may be selected from, for example, aluminum and aluminum alloys, copper and copper alloys, titanium and titanium alloys, and stainless steel.

The thickness of the metal foil 160 is not particularly limited, but may have a thickness in the range of 5 μm to 500 μm, for example.

(Junction layers 170, 180)
The bonding layers 170 and 180 are not particularly limited in material and configuration as long as they can be bonded to the metal foil 160 by heat treatment. For example, the bonding layers 170 and 180 may be vitrified layers (softening point 350 to 600 ° C.).

The vitrified layer is formed by firing a paste containing glass frit. The vitrified layer contains a glass component, but may further contain ceramic particles.

The composition of the glass component contained in the vitrified layer is not particularly limited. The glass component contained in the vitrified layer may be, for example, ZnO—Bi ₂ O ₃ —B ₂ O ₃ or ZnO—SnO—P ₂ O ₅ glass.

Table 1 shows an example of the composition of a ZnO—Bi ₂ O ₃ —B ₂ O ₃ -based glass that can be used as a glass component contained in the vitrified layer. Table 2 shows an example of the composition of ZnO—SnO—P ₂ O ₅ based glass that can be used for the glass component contained in the vitrified layer.

Alternatively, the bonding layers 170, 180 may include a brazing material or a solder material.

In addition, the bonding layers 170 and 180 are not necessarily configured by a single layer, and may be configured by a plurality of layers.

The thickness of the bonding layer (in the case of a plurality of layers, the total thickness) is not limited to this, but may be, for example, in the range of 10 μm to 1000 μm.

(Spacer 190)
The spacer 190 may have the same material, shape, and / or dimensions as the spacer used in typical vacuum double glazing.

(About the manufacturing method of the vacuum double layer glass by one Example of this invention)
Next, with reference to FIGS. 4 to 8, a method for manufacturing a vacuum double-layer glass according to an embodiment of the present invention will be described in detail.

FIG. 4 schematically shows a flow of a manufacturing method (first manufacturing method) of vacuum double-glazed glass according to an embodiment of the present invention.

As shown in FIG. 4, the first manufacturing method is:
(A) a first glass substrate having first and second surfaces, having a frame-shaped first bonding layer on the first surface, and third and fourth surfaces; Preparing a second glass substrate having a frame-shaped second bonding layer on the surface thereof, and a frame-shaped metal foil; (Step S110);
(B) disposing the metal foil on the first surface of the first glass substrate to form a first assembly, wherein the metal foil is at an inner peripheral position or an outer peripheral position; A first assembly configuration step (step S120), arranged to be in contact with one bonding layer;
(C) A metal foil fixing step (step S130) of heat-treating the first assembly to fix the metal foil on the first glass substrate;
(D) disposing the second glass substrate on the metal foil side of the first assembly to constitute a second assembly, wherein the second glass substrate is A second assembly configuration step (step S140), wherein the second bonding layer is disposed so that the third surface is on the metal foil side in a state of non-contact with the first assembly. When,
(E) carrying the second assembly into a vacuum chamber to form a joined body, the second assembly being held in a reduced-pressure environment and then heated to heat the second joint; A joined body configuration step (step S150) for joining the second glass substrate to the first assembly through a layer;
(F) A joined body unloading step (step S160) for unloading the joined body from the vacuum chamber;
Have

Hereinafter, each process will be described in detail.

(Step S110)
First, a first glass substrate 210 having a frame-shaped first bonding layer 270 as shown in FIG. 5, a second glass substrate 220 having a frame-shaped second bonding layer 280, and a frame-shaped metal foil. 260 is prepared.

Here, the first glass substrate 210 having the frame-shaped first bonding layer 270 is manufactured as follows.

First, a first glass substrate 210 having first and

second surfaces

212 and 214 is prepared. Next, a frame-shaped first bonding layer 270 is formed on the first surface 212 of the first glass substrate 210 by the following method.

(Formation of bonding layer)
As described above, the material of the first bonding layer 270 is not particularly limited, but here, in the case where the first bonding layer 270 is formed of a vitrified layer, the first glass substrate 210 is formed as an example. A method for forming the first bonding layer 270 on the first surface 212 will be described.

When forming a vitrified layer around the first surface 212 of the first glass substrate 210, first, a paste for the vitrified layer is prepared. Usually, the paste includes glass frit, ceramic particles, a polymer, an organic binder, and the like. However, the ceramic particles may be omitted. The glass frit finally becomes a glass component constituting the vitrified layer.

The prepared paste is applied around the first surface 212 of the first glass substrate 210.

Next, the first glass substrate 210 containing the paste is dried. The conditions for the drying treatment are not particularly limited as long as the organic binder in the paste is removed. The drying process may be performed, for example, by holding the first glass substrate 210 at a temperature of 100 ° C. to 200 ° C. for about 30 minutes to 1 hour.

Next, in order to pre-fire the paste, the first glass substrate 210 is heat-treated at a high temperature. The conditions for the heat treatment are not particularly limited as long as the polymer contained in the paste is removed. The heat treatment may be performed, for example, by holding the first glass substrate 210 in a temperature range of 300 ° C. to 470 ° C. for about 30 minutes to 1 hour. Thereby, a paste is baked and a glass solidification layer is formed.

The frame-shaped second bonding layer 280 can be formed on the third surface 222 of the second glass substrate 220 by the same method.

(Step S120)
Next, the metal foil 260 is disposed on the first surface 212 of the first glass substrate 210 to form the first assembly 203.

FIG. 6 schematically shows the first assembly 203. 6A is a schematic perspective view of the first assembly 203, and FIG. 6B is a schematic cross-sectional view of the first assembly 203.

As shown in FIG. 6, the metal foil 260 is disposed so as to come into contact with the first bonding layer 270 on the inner peripheral side as viewed from above. However, this is merely an example, and the metal foil 260 may be disposed so as to be in contact with the first bonding layer 270 on the outer peripheral side in a top view.

(Step S130)
Next, the first assembly 203 is heated to melt and soften the first bonding layer 270. As a result, the metal foil 260 is bonded to the first glass substrate 210.

The heating temperature is not particularly limited as long as the first bonding layer 270 is melted and softened. When the first bonding layer 270 is a vitrified layer, the heating temperature may be in the range of 400 ° C. to 600 ° C., for example.

In the heat treatment of the first assembly 203, a weight is placed on the metal foil 260, and a pressing pressure is applied from above. For this reason, the metal foil 260 does not deform (thermally expand) during heating. Therefore, when the first assembly 203 is cooled, as shown in FIG. 6, the metal foil 260 is in a predetermined position with respect to the first bonding layer 270 (for example, the first bonding layer 270 is fixed such that 270 is on the inner peripheral side of the metal foil 260.

(Step S140)
Next, the second glass substrate 220 is disposed on the first assembly 203 in which the first bonding layer 270 and the metal foil 260 are bonded, and the second assembly 205 is configured.

FIG. 7 shows a schematic cross-sectional view of the second assembly 205.

As shown in FIG. 7, the second glass substrate 220 has a third surface 222 and a fourth surface 224. Further, when the second assembly 205 is configured, the second glass substrate 220 is arranged such that the third surface 222 side on which the second bonding layer 280 is formed becomes the first assembly 203 side. Placed in.

In addition, the second glass substrate 220 is disposed on the first assembly 203 so as to be in a non-contact state with the first assembly 203. Such a non-contact state can be realized, for example, by using a support member (not shown) that supports the second glass substrate 220 on the top of the first assembly 203.

In the example shown in FIG. 7, in the second assembly 205, the first assembly 203 is disposed on the lower side, and the second glass substrate 220 is disposed on the upper side. However, the second assembly may be configured such that the first assembly 203 is disposed on the upper side and the second glass substrate 220 is disposed on the lower side.

(Step S150)
Next, the second assembly 205 is carried into the vacuum chamber.

The inside of the vacuum chamber may be in a depressurized state before the second assembly 205 is introduced. Alternatively, the inside of the vacuum chamber may be decompressed after the second assembly 205 is introduced.

The pressure in the vacuum chamber in the reduced pressure state may be in the range of 1 × 10 ⁻⁵ Pa to 10 Pa, for example.

More specifically, after a predetermined time has elapsed after the second assembly 205 is introduced into the vacuum chamber, more specifically, the space between the first assembly 203 and the second glass substrate 220 reaches a sufficiently reduced pressure state. After that, for example, the support member that supports the second glass substrate 220 is removed, and the second glass substrate 220 falls onto the upper portion of the first assembly 203. Thereby, the 3rd assembly 207 of the state which the 2nd joining layer 280 and the metal foil 260 contacted is comprised.

FIG. 8 shows a schematic cross-sectional view of such a third assembly 207. It will be apparent that in the third assembly 207, the gap 230 formed between the

glass substrates

210 and 220 is in a reduced pressure state.

Next, in this state, the third assembly 207 is heated in the vacuum chamber. During heating, a weight may be placed on the third assembly 207. By using the weight, the second bonding layer 280 is distributed uniformly around the periphery of the third assembly 207, and more between the first glass substrate 210 and the second glass substrate 220. Good bonding can be obtained.

The heating temperature is not particularly limited as long as the second bonding layer 280 is melted and softened. For example, when the second bonding layer 280 is a vitrified layer, the heating temperature may be in the range of 400 ° C. to 600 ° C., for example.

Note that the heating temperature in this step may be substantially the same as the heating temperature in step S130 described above. Alternatively, the heating temperature in this step may be substantially higher than the heating temperature in step S130 described above.

When the third assembly 207 is heated, a difference in thermal expansion between the first and

second glass substrates

210 and 220 and the metal foil 260 causes the metal foil 260 to Stretch somewhat toward the outside (right side of the figure).

However, in the third assembly 207, the metal foil 260 is already bonded to the first bonding layer 270, and the position on the inner peripheral side is solidified. For this reason, even if the 3rd assembly 207 is heated within a vacuum chamber, the position with respect to the 1st joining layer 270 of the metal foil 260 does not change. Even if the metal foil 260 extends outward, there is no problem that the metal foil 260 does not come into contact with the second bonding layer 280.

As a result, after the third assembly 207 is heated, a seal member in which the metal foil 260 and the first and second bonding layers 270 and 280 are arranged in a predetermined positional relationship is formed. Moreover, the 1st glass substrate 210 and the 2nd glass substrate 220 are joined via a sealing member, and a joined body is manufactured.

(Step S160)
Thereafter, the joined body is unloaded from the vacuum chamber.

Through the above steps, a vacuum double-glazed glass can be produced.

In such a first manufacturing method, the metal foil 260 is hardly displaced during the heat treatment for bonding the first glass substrate 210 and the second glass substrate 220 in the vacuum chamber.

Therefore, in such a first manufacturing method, it is possible to continuously manufacture a vacuum double-glazed glass having a seal member having a desired configuration by the “flow method”. For this reason, the productivity of the vacuum double-glazed glass is improved.

(About another manufacturing method of the vacuum double-glazed glass by one Example of this invention)
Next, another method for manufacturing a vacuum double-glazed glass according to an embodiment of the present invention will be described in detail with reference to FIGS.

FIG. 9 schematically shows a flow of another manufacturing method (second manufacturing method) of vacuum double-glazed glass according to an embodiment of the present invention.

As shown in FIG. 9, the second manufacturing method is
(A) a first glass substrate having first and second surfaces, having a frame-shaped first bonding layer on the first surface, and third and fourth surfaces; Preparing a second glass substrate having a frame-shaped second bonding layer on the surface thereof, and a frame-shaped metal foil; (Step S210);
(B) a step of disposing the metal foil on the first surface of the first glass substrate to form a first assembly, wherein the metal foil is at an inner peripheral position and an outer peripheral position, A first assembly configuration step (step S220), arranged to be in contact with the first bonding layer and the third bonding layer;
(C) A metal foil fixing step (step S230) of heat-treating the first assembly to fix the metal foil on the first glass substrate;
(D) disposing the second glass substrate on the metal foil side of the first assembly to constitute a second assembly, wherein the second glass substrate is A second assembly configuration step (step S240), wherein the second bonding layer is disposed so that the third surface is on the metal foil side in a non-contact state with respect to the first assembly. When,
(E) carrying the second assembly into a vacuum chamber to form a joined body, the second assembly being held in a reduced-pressure environment and then heated to heat the second joint; A joined body configuration step (step S250) for joining the second glass substrate to the first assembly through a layer;
(F) A joined body unloading step (Step S260) for unloading the joined body from the vacuum chamber;
(G) A bonded body cutting step (step S270), which is performed when necessary, and cuts the bonded body so that the first bonding layer and the second bonding layer remain.
Have

Note that the basic steps of the second manufacturing method are the same as those of the first manufacturing method described above. Therefore, here, it demonstrates centering on a different part from the process of a 1st manufacturing method among each process.

(Step S210)
First, as shown in FIG. 10, a first glass substrate 310 having a first bonding layer 370 and a third bonding layer 372, a second glass substrate 320 having a second bonding layer 380, and a frame-like shape A metal foil 360 is prepared.

The first glass substrate 310 has a first surface 312 and a second surface 314, and the first bonding layer 370 and the third bonding layer 372 are formed on the first surface 312. In addition, the second glass substrate 320 has a third surface 322 and a fourth surface 324, and the second bonding layer 380 is formed on the third surface 322.

The arrangement positions of the first bonding layer 370, the second bonding layer 380, and the third bonding layer 372 are as viewed from above when the first and

second glass substrates

310 and 320 are superposed in a predetermined arrangement. The first bonding layer 370 is the innermost side, and the third bonding layer 372 is the outermost side.

Note that the method of forming the first bonding layer 370, the second bonding layer 380, and the third bonding layer 372 is the same as in the case of the first manufacturing method described above, and will not be described further here.

(Step S220)
Next, as shown in FIG. 11, the metal foil 360 is disposed on the first surface 312 of the first glass substrate 310, and the first assembly 303 is configured.

Here, as shown in FIG. 11, the metal foil 360 is in contact with the first bonding layer 370 on the inner peripheral side of the metal foil 360 as viewed from above, and the third bonding layer 372 on the outer peripheral side of the metal foil 360. Arranged to touch.

(Step S230)
Next, the first assembly 303 is heated to melt and soften the first and third bonding layers 370 and 372. Thereby, the metal foil 360 is bonded to the first glass substrate 310.

Here, as described above, in the heat treatment of the first assembly 303, a weight is placed on the metal foil 360, and a pressing pressure is applied from above. For this reason, the metal foil 360 does not deform (thermally expand) during heating. Therefore, when the first assembly 303 is cooled, as shown in FIG. 11, the metal foil 360 has the first bonding layer 370 disposed on the inner peripheral side and the third bonding layer on the outer peripheral side. 372 is arranged and fixed on the first glass substrate 310.

(Step S240)
Next, the second glass substrate 320 is disposed on the first assembly 303 to form the second assembly 305.

FIG. 12 shows a schematic cross-sectional view of the second assembly 305.

As shown in FIG. 12, when the second assembly 305 is formed, the second glass substrate 320 has a first surface 303 on the third surface 322 side on which the second bonding layer 380 is formed. It is arranged to be on the side.

In addition, the second glass substrate 320 is disposed on the first assembly 303 so as to be in a non-contact state with the first assembly 303.

In the second assembly 305, as described above, the arrangement relationship of the bonding layers 370, 372, and 380 is that the first bonding layer 370 is the innermost side and the third bonding layer 372 is the outermost side, as described above. (See FIG. 12).

(Step S250)
Next, the second assembly 305 is carried into the vacuum chamber. Further, after a predetermined time elapses, the second glass substrate 320 falls onto the upper part of the first assembly 303. Thereby, the 3rd assembly 307 of the state which the 2nd joining layer 380 and the metal foil 360 contacted is comprised.

FIG. 13 shows a schematic cross-sectional view of such a third assembly 307. It will be apparent that in the third assembly 307, the gap 330 formed between the

glass substrates

310 and 320 is in a reduced pressure state.

Thereafter, a sealing member in which the metal foil 360 and the first to third bonding layers 370, 372, and 380 are arranged in a predetermined positional relationship is formed by the same heat treatment as in the first manufacturing method. The Moreover, the 1st glass substrate 310 and the 2nd glass substrate 320 are joined via a sealing member, and a joined body is manufactured.

Here, in the second manufacturing method, the metal foil 360 is fixed by the first bonding layer 370 on the inner peripheral side and fixed by the third bonding layer 372 on the outer peripheral side before the heat treatment in the vacuum chamber. ing. For this reason, during the heat treatment, the metal foil 260 is difficult to extend in both the outer and inner directions of the second assembly 205. As a result, in the second manufacturing method, both movement and deformation (expansion) of the metal foil 260 that can occur during the heat treatment can be suppressed.

Therefore, in the second manufacturing method, the displacement of the metal foil 360 is further suppressed, and the metal foil 360 and the first to third bonding layers 370, 380, 372 are properly arranged in a predetermined positional relationship. A sealing member can be configured.

(Step S260)
Thereafter, the joined body is unloaded from the vacuum chamber.

(Step S270)
A vacuum double-glazed glass can be manufactured by the process up to step S260. However, if necessary, a joined body cutting step may be performed after step S260.

FIG. 14 schematically shows a cross section of the joined body 309 before and after the cutting step. In FIG. 14, the broken line indicates the shape of the bonded body 309 before cutting, and the solid line indicates the shape of the bonded body 309 after cutting.

As shown in FIG. 14, in the cutting process, the periphery of the bonded body 309 is cut and removed. More specifically, the bonded body 309 is cut at a position where the first bonding layer 370 and the second bonding layer 380 are left and the second bonding layer 372 is removed. A known method can be applied as the cutting method. For example, in the case of cutting with a water jet, the first glass substrate 310, the second glass substrate 320, and the metal foil 360 can be cut at a time.

幅 By carrying out the cutting step, the width of the seal member can be reduced.

The embodiment of the present invention has been described above with reference to the first manufacturing method and the second manufacturing method. However, it should be noted that the present invention is not limited to these embodiments.

For example, also in the first manufacturing method, after the joined body is carried out of the vacuum chamber, a cutting step of the peripheral end of the joined body may be performed. This step is significant in the case where the first bonding layer is disposed on the inner peripheral side of the metal foil. This is because in this aspect, the outer periphery of the metal foil tends to extend outward due to the heat treatment in the vacuum chamber. By carrying out the cutting process of the joined body, the metal foil portion protruding outward can be removed.

In the description of the first manufacturing method and the second manufacturing method, the timing for installing the spacer 190 shown in FIG. 2 is not particularly mentioned. However, the spacer 190 is preliminarily installed on the first and / or second glass substrate in the step S110, or is installed when the second assembly is configured in the step S140. It will be apparent to those skilled in the art that it may be installed.

The present invention can be used for vacuum double glazing and the like used for window glass of buildings.

This application claims priority based on Japanese Patent Application No. 2013-217185 filed on Oct. 18, 2013, the entire contents of which are incorporated herein by reference.

DESCRIPTION OF SYMBOLS 100 Vacuum multilayer glass 101 Assembly 102 2nd assembly 110 1st glass substrate 112 1st surface 114 2nd surface 120 2nd glass substrate 122 3rd surface 124 4th surface 130 Gap 150 Seal member 160 Metal foil 162 First surface of metal member 164 Second surface of metal member 170 First bonding layer 180 Second bonding layer 190 Spacer 203 First assembly 205 Second assembly 207 Third Assembly 210 first glass substrate 212 first surface 214 second surface 220 second glass substrate 222 third surface 224 fourth surface 230 gap 260 metal foil 270 first bonding layer 280 second Bonding layer 303 First assembly 305 Second assembly 3 07 Third assembly 309 Bonded body 310 First glass substrate 312 First surface 314 Second surface 320 Second glass substrate 322 Third surface 324 Fourth surface 330 Gap 360 Metal foil 370 First Bonding layer 372 Third bonding layer 380 Second bonding layer

Claims

A method for producing a vacuum double-glazed glass comprising a reduced-pressure gap between a first glass substrate and a second glass substrate facing each other,
(A) a first glass substrate having first and second surfaces, having a frame-shaped first bonding layer on the first surface, and third and fourth surfaces; Providing a second glass substrate having a frame-shaped second bonding layer on the surface thereof, and a frame-shaped metal foil;
(B) disposing the metal foil on the first surface of the first glass substrate to form a first assembly, wherein the metal foil is at an inner peripheral position or an outer peripheral position; A step arranged to contact one bonding layer;
(C) heat-treating the first assembly to fix the metal foil on the first glass substrate;
(D) disposing the second glass substrate on the metal foil side of the first assembly to constitute a second assembly, wherein the second glass substrate is Two bonding layers are arranged in a non-contact state with respect to the first assembly, and the third surface is disposed on the metal foil side;
(E) carrying the second assembly into a vacuum chamber to form a joined body, the second assembly being held in a decompressed environment, and then the second joining layer being Bonding the second glass substrate to the first assembly via:
(F) unloading the joined body from the vacuum chamber;
A method for producing a vacuum double-glazed glass.
In the step (a), there are two frame-shaped first bonding layers,
In the step (b), the metal foil is disposed so as to be in contact with the first bonding layer at both an inner peripheral position and an outer peripheral position. Method.
further,
(G) After the step (f), the method further comprises the step of cutting the joined body such that the joining layer inside the first joining layer and the second joining layer remain. The manufacturing method of the vacuum double layer glass of description.
The method for producing a vacuum double-layer glass according to any one of claims 1 to 3, wherein the bonding layer has a glass solidified layer.