JPWO2019093320A1 - Glass panel - Google Patents

Abstract

To provide a glass panel in which the sealed state at the protruding portion of the suction hole sealing metal material formed around the suction hole on the surface of one glass plate on the atmosphere side is maintained for a long time. One of the pair of glass plates 1A and 1B has a suction hole 4 that penetrates the front and back surfaces of the glass plate 1A and sucks air in the gap V between the pair of glass plates 1A and 1B. It has a suction hole sealing metal material that seals the suction hole 4 by covering the suction hole 4 and the suction hole 4 in a state where the gap V is depressurized through the suction hole 4. At the protrusion 16 of the suction hole sealing metal material formed around the suction hole 4 on the atmospheric side surface of one glass plate 1A, the contact portion 33 with the atmospheric side surface of one glass plate 1A and the other. When viewed from the glass plate 1B side of the above, the white cloudy portion where light is diffusely reflected and glows white is set to 50% or less in terms of area ratio.

Description

In the present invention, a pair of glass plates facing each other, a gap formed by arranging a spacer between the pair of glass plates, and a peripheral edge portion of the pair of glass plates are joined over the entire circumference thereof. It is provided with a metal material for peripheral sealing that airtightly seals the gap portion, and one of the glass plates in the pair of glass plates penetrates the front and back sides of the glass plate and sucks the air in the gap portion. It has a hole and a suction hole sealing metal material that seals the suction hole by covering the suction hole and the vicinity of the suction hole in a state where the gap is depressurized through the suction hole. Regarding glass panels.

Conventionally, there has been no glass panel in which the state of the sealing portion of the suction hole made of a metal material for sealing the suction hole is specified (the corresponding public document is not found).

In the conventional glass panel described above, the suction hole sealing portion made of the suction hole sealing metal material is formed around the suction hole on the atmospheric side surface of the one glass plate for suction hole sealing. In the protruding portion of the metal material, if the adhesion of the contact portion of one of the glass plates with the surface on the atmosphere side is sufficient, the reduced pressure state in the gap portion is maintained for a long time, but if it is insufficient, the glass plate On the other hand, suction holes for the glass plate are caused by external forces such as wind pressure and pressure during wiping and cleaning, the temperature difference between the front and back of the glass plate due to sunlight, and the warp phenomenon that occurs due to the temperature difference between indoors and outdoors. There is a problem that the contact portion of the protruding portion of the sealing metal material is peeled off, a leak to the gap portion occurs, and the degree of depressurization thereof may decrease.

Therefore, an object of the present invention is to solve the above-mentioned problems and maintain a long sealing state at the protruding portion of the suction hole sealing metal material formed around the suction hole on the atmospheric side surface of one of the glass plates. It is in the place to provide the glass panel to be used.

The first characteristic configuration of the present invention is to have a pair of glass plates facing each other, a gap formed by arranging a spacer between the pair of glass plates, and a peripheral edge portion of the pair of glass plates on the entire circumference thereof. It is provided with a peripheral sealing metal material that is joined over and airtightly seals the gap portion, and one of the glass plates in the pair of glass plates is penetrated through the front and back sides of the glass plate to enter the gap portion. Suction hole sealing that seals the suction hole by covering the suction hole and the periphery of the suction hole in a state where the gap is depressurized through the suction hole and the suction hole. A glass panel having a metal material for suction, and the one glass plate at a protruding portion of the metal material for sealing the suction holes formed around the suction holes on the surface of the one glass plate on the atmosphere side. The area ratio of the white cloudy portion where light is diffusely reflected and glows white when viewed from the other glass plate side is 50% or less at the contact portion with the surface on the atmosphere side.

According to the first characteristic configuration of the present invention, if the white turbidity rate at the protruding portion of the suction hole sealing metal material is larger than 50%, the wind pressure or the pressure during wiping and cleaning is applied to the glass plate. When an external force such as, etc. acts, a warp phenomenon occurs due to a temperature difference between the front and back of the glass plate due to sunlight, a temperature difference between indoors and outdoors, etc., the protruding part of the metal material for sealing the suction hole to the glass plate The contact portion is peeled off, a leak occurs in the gap portion, and the degree of decompression of the gap portion cannot be maintained. On the other hand, in the protruding portion of the metal material for sealing the suction holes, the white cloudy portion where light is diffusely reflected to the contact portion with the atmospheric side surface of one of the glass plates and shines white when viewed from the other glass plate side. If the area ratio is set to 50% or less, the contact portion of the protruding portion of the metal material for sealing the suction hole with respect to the glass plate will not be peeled off even if the above-mentioned external force or warpage phenomenon acts. The degree of decompression in the gap can be maintained.

In the second characteristic configuration of the present invention, the ratio of the white cloudy portion is further set to 30% or less, and the white cloudy portion is said to be from the outer peripheral edge portion of the protruding portion of the metal material for sealing the suction holes. It is located where a continuous portion extending to the outer peripheral edge of the suction hole is not formed.

For example, as shown in the conceptual diagram shown in FIG. 20, the white cloudy portion 18 forms a continuous portion extending from the outer peripheral edge portion of the protruding portion of the suction hole sealing metal material to the outer peripheral edge portion of the suction hole. If so, the durability against the above-mentioned external force and warpage phenomenon tends to deteriorate. On the other hand, according to the second characteristic configuration of the present invention, the ratio of the white cloudy portion is further set to 30% or less, and the white cloudy portion is a protruding portion of the metal material for sealing the suction holes. If the continuous portion from the outer peripheral edge portion of the suction hole to the outer peripheral edge portion of the suction hole is not formed, not only the durability against the above-mentioned external force and the warp phenomenon but also the acid resistance can be ensured.

In the third characteristic configuration of the present invention, the ratio of the white cloudy portion is further set to 10% or less, and the white cloudy portion is said to be from the outer peripheral edge portion of the protruding portion of the metal material for sealing the suction holes. It does not form a continuous portion leading to the outer peripheral edge of the suction hole.

According to the third characteristic configuration of the present invention, not only acid resistance but also alkali resistance can be expected, not to mention having durability against the above-mentioned external force and warpage phenomenon.

In other words, when used for windowpanes of buildings, alkaline detergents are often used for cleaning windows on the windowpanes, and even in that case, if the proportion of cloudy white areas is 10% or less, it is white. Even if the cloudy portion is invaded by alkali, leakage of the gap portion can be prevented without peeling off the contact portion.

The fourth characteristic configuration of the present invention is that the white cloudy portion is an oxide of the metal material for sealing the suction holes.

The fifth characteristic configuration of the present invention is that the main component of the metal material for sealing the suction holes contains any of Zn, Al, Si and Ti with respect to Sn of 72 to 99.9%. However, the lead content is less than 0.1% by weight.

According to the fifth characteristic configuration of the present invention, any one of the contained Zn, Al, Si and Ti can be combined with oxygen on the surface of the glass plate to improve the bonding strength.

The sixth characteristic configuration of the present invention is that the lower limit of the ratio of the white cloudy portion in the area ratio includes a measurable finite value.

It is a partially cutaway perspective view of a glass panel. It is a vertical sectional view around the suction hole of a glass panel. It is a flowchart which shows the manufacturing method of a glass panel. It is a vertical sectional view of a main part which shows the peripheral sealing step. It is an operation explanatory drawing of the introduction plate. It is an enlarged view of the peripheral part of a suction hole before sealing a suction hole. It is the schematic explanatory drawing of the contact surface measuring apparatus. It is a vertical cross-sectional view of a stress detection device. It is a schematic plan view of the repeated bending test. It is a schematic side view of the repeated bending test. It is the schematic of the repeated bending test, and is the top view which shows the position of the pressurizing part by a glass panel and a pressurizing block. It is a longitudinal explanatory view which shows the refraction and reflection of light with respect to a glass panel. In the enlarged photograph of the protruding portion of the metal material for sealing the suction holes, (a) shows a state in which the white cloudiness rate is 10% or less. An enlarged photograph of the protruding portion of the metal material for sealing the suction holes shows a case where the white cloudiness rate is more than 50%. It is a vertical cross-sectional view of a suction hole sealing device, and is a state before the metal material for sealing is pierced by a sharpened member. It is a vertical cross-sectional view of a suction hole sealing device, and is a state when a metal material for sealing is pierced by a sharpened member. It is a vertical cross-sectional view of a suction hole sealing device, and is a state when a metal material for sealing is pierced by a sharpened member. It is a vertical cross-sectional view of a suction hole sealing device, and is a state after a metal material for sealing is pierced by a sharpened member. It is a vertical sectional view of a molten metal induction part. The vertical cross-sectional view of the main part of another embodiment shows the state before the sharpened member pierces the sealing metal material. The vertical cross-sectional view of the main part of another embodiment shows the state when the sharpened member pierces the sealing metal material. The vertical cross-sectional view of the main part of another embodiment shows the state when the sharpened member pierces the sealing metal material. The vertical cross-sectional view of the main part of another embodiment shows a state after the sharpened member pierces the sealing metal material. An explanatory view of the longitudinal action of a main part of a suction hole sealing device of a conventional example shows a state before crushing a metal material for sealing. An explanatory view of the longitudinal action of the main part of the suction hole sealing device of the conventional example shows a state in which the metal material for sealing is being crushed. An explanatory view of the longitudinal action of a main part of a suction hole sealing device of a conventional example shows a state in which a metal material for sealing is crushed. It is a conceptual diagram of a cloudy white part.

Embodiments of the present invention will be described below with reference to the drawings.
In FIG. 1, in the glass panel P, a plurality of columnar spacers 2 are interposed between a pair of glass plates 1A and 1B and a pair of glass plates 1A and 1B facing each other at a constant spacer pitch Pd in a matrix. The formed gap V, the peripheral sealing metal material 3 that seals the peripheral edge V1 of the gap V, and the suction hole 4 that penetrates one of the pair of glass plates 1A and 1B, 1A, are formed. Have. The suction hole 4 is sealed with a suction hole sealing metal material 15 that covers the area around the suction hole 4.

In the glass panel P, the two glass plates 1A and 1B are transparent float glass, and the gap V is reduced to 1.33 Pa (1.0 × 10 ⁻² Torr) or less. This is because the gap V is decompressed by discharging the air inside the gap V through the suction hole 4, and the peripheral sealing metal material 3 and the suction hole are sealed in order to maintain the decompressed state of the gap V. It is sealed with a metal material 15.

The spacer 2 has a columnar shape, its diameter is about 0.3 to 1.0 mm, and its height is about 30 μm to 1.0 mm. The spacer 2 is a material that does not buckle even when a compressive stress caused by atmospheric pressure acting on the glass plates 1A and 1B is applied, for example, a compressive strength of 4.9 × 10 ⁸ Pa (5 × 10 ³ kgf / cm). ² ) It is made of the above materials, preferably stainless steel (SUS304) or the like.

FIG. 3 is a flowchart showing a method of manufacturing the glass panel P of FIG.
First, two glass base plates (not shown) having a predetermined thickness made of float glass are cut into predetermined dimensions, for example, 1200 mm × 900 mm, respectively, and glass plates 1A and 1B having the same shape and the same size are prepared. (Step S31), a suction hole 4 is drilled in the glass plate 1A in the vicinity of any one of the four corners by a drill or the like (step S32) (drilling step).

Next, in a space such as a clean room or a chemical clean room where the air pollution state can be chemically or physically controlled, a pair of glass plates are used by using at least one method of pure water brush cleaning, liquid cleaning method, and light cleaning. 1A and 1B are washed (step S33) (cleaning step). In this liquid cleaning method, pure water, deionized water and the like are used. The cleaning liquid also contains, for example, alkaline detergent or ozone water. Further, the cleaning liquid may contain an abrasive. As the abrasive, for example, fine particles containing cerium oxide as a main component are used.

Then, a plurality of spacers 2 are arranged in a matrix with a constant spacer pitch Pd on the washed glass plate 1B in which the suction holes 4 are not formed, and the washed glass plates 1A are overlapped with each other to form a pair. Pair the glass plates 1A and 1B (step S34).

Further, the paired glass plates 1A and 1B are kept substantially horizontal, and the peripheral portion V1 of the pair of glass plates 1A and 1B is formed by using the peripheral sealing metal material 3 having a melting temperature of 250 ° C. or less. Seal (step S35) (peripheral sealing).

FIG. 4 is a diagram used to explain the peripheral sealing in step S35 of FIG.
In FIG. 4, the metal introducing device 5 has a surface plate 6 having a high portion 6a and a low portion 6b lower than the high portion 6a and formed in a stepped shape, and a pair of glass plates 1A at the high portion 6a. , 1B and a supply tower 7 for supplying solder to a pair of glass plates 1A and 1B in the lower portion 6b. Two rail members 12 are arranged along the pair of glass plates 1A and 1B on the lower portion 6b of the stepped surface plate 6, and the supply tower 7 is placed on the moving mechanism 13 traveling on the rail members 12. It is placed in.

The supply tower 7 has a crucible portion 9 having a rectangular cross section for storing liquid phase or solid phase solder, and an electric heater 10 built in the side wall portion of the crucible portion 9 and heating the solder stored in the crucible portion 9. And the introduction path 11 having a long cross section that communicates with the bottom of the crucible portion 9 and opens toward the outside of the peripheral portions V1 of the pair of glass plates 1A and 1B, and is horizontally arranged in the middle of the introduction path 11. It is provided with a soldering plate 8. The introduction plate 8 extends from the introduction path 11 and fits into the peripheral portions V1 of the pair of glass plates 1A and 1B, whereby the solder penetrates into the gap portion V together with its surface tension. In addition, the gravity of the solder at the liquid level ΔH in the crucible portion 9 is applied to the solder at the portion of the introduction plate 8, thereby promoting the invasion of the solder into the peripheral portions V1 of the pair of glass plates 1A and 1B. ..

Further, as shown in FIG. 5, the introduction plate 8 may have a shape in which bent portions 8A in a state of waving up and down a plurality of times in the moving direction are formed at two positions at intervals (bellows shape).
That is, by moving the introduction plate 8 having the bent portion 8A, the bent portion 8A having a spring action comes to lightly rub the surface of the glass plate, further improving the adhesiveness of the solder to the glass surface, and the gap. The effect of ensuring the airtightness of the part V can be exhibited.

Further, the introduction plate 8 may have a bow-shaped shape having a spring action or a flat plate shape having no bent portion. However, for the above reasons, the introduction plate 8 having the bent portion 8A is more advantageous.

On the other hand, since the moving mechanism 13 moves on the rail member 12 at a constant speed along the peripheral edges V1 of the pair of glass plates 1A and 1B, the introduction plate 8 is moved from the groove portion 14 of the pair of glass plates 1A and 1B. When inserted into the gap V, the peripheral sealing metal material 3 penetrates through the introduction plate 8 over the entire peripheral edge V1 of the pair of glass plates 1A and 1B. As a result, the peripheral portion V1 of the gap portion V formed between the pair of glass plates 1A and 1B is hermetically sealed by the peripheral sealing metal material 3.

As shown in FIG. 6, the groove portion 14 is provided at the corner portion of the glass panel P, and the pair of glass plates 1A, can be easily implemented when the introduction plate 8 is inserted into the gap portion V. This is a portion where the corner portion on the V side of the gap portion of 1B is chamfered.

In the following step S36, a rotary pump or a turbo molecular pump (not shown) attached to the main surface of the glass plate 1A on the atmosphere side so as to cover the suction hole 4 with an exhaust cup in the vicinity of the suction hole 4 is used. By suction, a vacuum is drawn to discharge the gas molecules in the gap V to the outside in order to reduce the pressure in the gap V to 1.33 Pa or less (step S36).

However, the pump used in this step is not limited to the above-mentioned rotary pump and turbo molecular pump, and may be any pump that can be connected to the exhaust cup and can be sucked.

Next, the suction hole sealing metal material 15 is dropped so as to cover the suction hole 4, and the glass surface in the vicinity of the suction hole 4 and the suction hole sealing metal material 15 are adhered and sealed (step S37). ).
As a result, the gap V formed between the pair of glass plates 1A and 1B is sealed.

In each of the above-mentioned steps, the main surfaces of the pair of glass plates 1A and 1B are washed (step S33), and then the glass surface in the vicinity of the suction hole 4 and the metal material 15 for sealing the suction hole are adhered and sealed. Each step up to stopping (step S37) is carried out in a space where the state of air contamination can be chemically or physically controlled, respectively.

In the present embodiment, the pair of glass plates 1A and 1B are cleaned by using the liquid cleaning method, but the present invention is not limited to this, and the pure water brush cleaning method, the ultrasonic cleaning method, the alkaline water cleaning method, and the heat cleaning method are not limited to this. , Vacuum (freezing) cleaning method, UV cleaning method, ozone cleaning method, and plasma cleaning method may be used to clean the pair of glass plates 1A and 1B. As a result, it is possible to suppress the generation of gas molecules that can be decomposed or scattered from the main surfaces of the pair of glass plates 1A and 1B, and thus the initial performance of the glass panel P can be exhibited for a long period of time.

In the present embodiment, as the peripheral sealing metal material 3, Ti is added to a solder having a melting temperature of 250 ° C. or lower, for example, a solder having a composition of 91.2 Sn-8.8 Zn (eutectic temperature: 198 ° C.). The peripheral portion V1 of the pair of glass plates 1A and 1B is sealed with the added solder. However, the peripheral sealing metal material 3 (solder) is not limited to this, and at least one material selected from the group consisting of Sn, Cu, In, Bi, Zn, Pb, Sb, Ga, and Ag. The peripheral portions V1 of the pair of glass plates 1A and 1B may be sealed by using a sealing material which is a metal material containing the above and has a melting temperature of 250 ° C. or less.

Further, the peripheral sealing metal material 3 may contain at least one material selected from the group consisting of Al, Cr, and Si in place of Ti or in addition to Ti. As a result, the adhesiveness between the peripheral sealing metal material 3 and the glass components of the pair of glass plates 1A and 1B can be improved.

In the present embodiment, as the suction hole sealing metal material 15, a solder having a melting temperature of 250 ° C. or lower, for example, a solder having a composition of 91.2 Sn-8.8 Zn (eutectic temperature: 198 ° C.) is used as Ti. The suction hole 4 is sealed with the added solder. However, the suction hole sealing metal material 15 (solder) is not limited to this, and at least one selected from the group consisting of Sn, Cu, In, Bi, Zn, Pb, Sb, Ga, and Ag. The suction hole 4 may be sealed by using a sealing material which is a metal material including the material and whose melting temperature is 250 ° C. or lower.
When Sn is selected, it may be 90% or more, and in the case of Sn to which Cu is added, the amount of Cu needs to be 0.1% or less.

Further, the suction hole sealing metal material 15 may contain at least one material selected from the group consisting of Al, Cr, and Si in place of Ti or in addition to Ti.
Further, the suction hole sealing metal material 15 may use solder having a component different from that of the peripheral sealing metal material 3.
By containing Ti (titanium) in the suction hole sealing metal material 15 or the peripheral sealing metal material 3, the adhesiveness of the glass is improved.

In the present embodiment, the pressure in the gap V is reduced to 1.33 Pa or less, but the pressure is not limited to this, and the pressure in the gap V may be reduced until the vacuum becomes almost vacuum. As a result, the heat insulating performance of the glass panel P can be further improved.

In the present embodiment, the lower limit of the thickness Tg of the pair of glass plates is 0.3 mm or more. Further, it is preferably 0.5 mm or more. More preferably, it is 1 mm or more. If the thickness Tg of the pair of glass plates is thin, the amount of heat stored in the glass itself becomes small, so that the amount of heat radiated into the air per unit time increases during peripheral sealing, and the peripheral sealing metal material 3 cools. Easy to be done. Therefore, it is possible to promote the solidification of the molten metal material 3 for peripheral sealing. However, as the glass plate becomes thinner, the rigidity of the glass plate decreases, so that the amount of deformation of the glass plate due to an external force of the same magnitude increases. Therefore, in the glass panel P, the tensile stress generated near the surface of the suction hole 4 on the gap side becomes large.

The upper limit of the thickness Tg of the pair of glass plates is 15 mm or less. It is preferably 12 mm or less. More preferably, it is 10 mm or less. When a thick glass plate is used, the rigidity of the glass plate is increased, so that the amount of deformation of the glass plate due to an external force of the same magnitude is reduced. Therefore, in the glass panel P, the tensile stress generated near the surface of the suction hole 4 on the gap side is reduced, so that the long-term durability is improved. On the other hand, when the glass plate thickness Tg is increased, the inflow amount of the suction hole sealing metal material 15 into the suction hole 4 decreases when the suction hole is sealed. Therefore, the protrusion of the suction hole sealing metal material 15 on the gap side becomes small, and it becomes difficult to relax the tensile stress generated near the surface of the suction hole 4 on the gap side.

The pair of glass plates 1A and 1B are float glass, but the present invention is not limited to this. The pair of glass plates 1A and 1B may be, for example, template glass, frosted glass having a light diffusion function by surface treatment, wire-reinforced glass, wire-reinforced glass plate, tempered glass, and double-strengthened glass, depending on the above-mentioned applications. , Low-reflection glass, high-transmission glass plate, ceramic glass plate, special glass having a heat ray or ultraviolet absorption function, or a combination thereof, and various other glasses can be appropriately selected and used.
Further, as for the composition of the pair of glass plates 1A and 1B, soda silicate glass, soda lime glass, borosilicate glass, aluminosilicate glass, various crystallized glasses and the like can be used.

In the present embodiment, the groove portion 14 chamfers the corner portion of the glass plates 1A and 1B on the V side of the gap in a flat shape, but the present invention is not limited to this, and the groove portion 14 is chamfered in a curved surface shape. As long as the introduction plate 8 can be easily inserted, it can be appropriately selected and provided on the glass plates 1A and 1B.

In the present embodiment, the spacer pitch Pd is 5 to 100 mm, preferably 5 to 80 mm, and more preferably 5 to 60 mm.

Further, the spacer 2 is made of stainless steel, but the spacer 2 is not limited to this. The spacer 2 includes, for example, metal such as inconel, iron, aluminum, tungsten, nickel, chromium, titanium, carbon steel, chrome steel, nickel steel, nickel chrome steel, manganese steel, chrome manganese steel, chrome molybdenum steel, silicon steel, and the like. It may be formed of an alloy such as brass, solder or duralmin, or a material having high rigidity such as ceramic or glass. Further, the spacer 2 is not limited to a columnar shape, and may have various shapes such as a square shape and a spherical shape.

In the present embodiment, the gap height Vh is 30 μm to 1 mm. However, it is substantially the same as the height of the spacer 2.

For the gap V, an evaporative getter is used to adsorb the gas molecules in the gap V, or a non-evaporative getter that adsorbs and removes the gas molecules by being heated and activated is used. Alternatively, a non-evaporative getter and an evaporative getter may be used in combination. Further, in the gap V, the getter material (adsorbent) and the adsorbent accommodating holes may be two or more.

In the present embodiment, the peripheral sealing metal material 3 is formed by using the metal introduction device 5, but is not limited thereto. The peripheral sealing metal material 3 may be formed by using any one of an anode bonding method, an ultrasonic bonding method, a multi-stage bonding method, a laser bonding method, and a crimp bonding method. Thereby, the adhesiveness of the peripheral sealing metal material 3 to the pair of glass plates 1A and 1B can be improved.

Further, the width Rw of the peripheral sealing metal material 3 in the thickness direction of the glass panel P with respect to the plane is 1 mm or more and 10 mm or less. If the width Rw is smaller than 1 mm, it becomes difficult to maintain the sealing of the gap V of the glass panel P. Further, if it exceeds 10 mm, the amount of heat exchange generated through the peripheral metal sealing material 3 becomes excessive. More preferably, the width Rw is 1 mm or more and 5 mm or less. In this case, in addition to maintaining the sealing of the gap V of the glass panel P, the amount of heat exchange can be further reduced.

In the present embodiment, the portion of the glass plate 1A in which the metal material 15 for sealing the suction holes after sealing protrudes from the surface on the atmosphere side is referred to as a protruding portion 16. The protrusion diameter Dw of the protrusion 16 (same as the width of the contact portion 33 in contact with the glass plate 1A in FIG. 1) is 2 to 30 mm. More preferably, it is 2 to 15 mm. However, the protrusion diameter Dw is larger than the suction hole diameter Sw described later in each case.
The protrusion thickness Dg of the protrusion 16 is 0.1 to 20 mm. It is preferably 0.1 to 10 mm.

In the present embodiment, the suction hole diameter Sw is 2 to 10 mm. It is preferably 2 to 5 mm. In the case of tempered glass, the suction hole diameter Sw is preferably larger than the glass thickness and 10 mm or less. This is to allow air to pass through the suction hole 4 when the air cooling is strengthened.

Further, at least one edge of the upper part and at least the lower part of the suction hole 4 may be formed in a curved surface shape or chamfered (a minute surface may be provided on the edge portion).

In the sealing portion of the suction hole 4 by the metal material 15 for sealing the suction hole, a protruding portion (of the metal material for sealing the suction hole) formed around the suction hole 4 on the atmospheric side surface of one of the glass plates 1A. The adhesion of the one glass plate 1A at the contact portion 33 with the surface on the atmosphere side is important for the protrusion 16). If all of the contact portions 33 have a metallic luster of the suction hole sealing metal material 15 when viewed from the back side of one of the glass plates 1A, the contact portions 33 are sufficiently adhered to each other, and the decompression state in the gap portion V is maintained for a long time. .. However, if the adhesion is insufficient, external forces such as wind pressure and pressure during wiping and cleaning act on the glass plate 1A, the temperature difference between the front and back of the glass plate 1A due to sunlight, and indoor and outdoor. Due to the warp phenomenon generated due to a temperature difference or the like, the contact portion 33 of the protruding portion 16 of the metal material for sealing the suction holes with respect to the glass plate 1A is peeled off. Then, since there is a possibility that a leak may occur in the gap portion V and the degree of decompression thereof may decrease, it is necessary to measure the adhesion of the contact portion 33.

The main component of the metal material for sealing the suction holes contains any one of Zn, Al, Si and Ti with respect to Sn of 72 to 99.9%, and the lead content is weight. % Is less than 0.1%.

[Experimental Example 1]
Therefore, in order to measure the adhesion of the contact portion 33, the following measuring device was prepared and various durability tests were performed.

[Contact surface measuring device]
As shown in FIG. 7, the glass panel P (subject), which is the object to be measured, has the glass plate 1A provided with the suction hole 4 on the lower side on the irradiation panel device 23 which is uniformly irradiated with light from below. It is provided as follows. The contact portion 33 of the metal material for sealing the suction hole around the suction hole 4 with respect to the glass plate is irradiated above the irradiation panel device 23 at an angle of 45 degrees from each of the left and right sides with respect to the subject. A pair of left and right photographing boxes 24 are provided, which have a built-in fluorescent lamp and whose inside is painted black or covered with a black cloth to prevent reflection. A camera 25 for photographing the protruding portion 16 of the metal material for sealing the suction hole of the subject is installed above the center of the irradiation panel device 23 to form the contact surface measuring device 26.

The irradiation panel device 23 is provided with two fluorescent lamps 10W, a color temperature of 5000K, and an illuminance of 5500 lux, and the photographing box 24 is provided with a 27W fluorescent lamp (daylight color) and an illuminance of 4800 lux.
The camera settings are set to F value 3.5, shutter speed: 1/200 second, and ISO sensitivity 100.

When the contact portion 33 is measured by the contact surface measuring device 26, when the suction hole sealing metal material 15 is adhered to the glass plate 1A, it becomes metallic luster and is 45 degrees from the photographing box 24. The incident light is reflected almost 100% as it is, and the emitted light does not enter the camera 25 and appears black. Therefore, if there is a poorly adhered portion or impurities such as metal oxide are deposited on the protruding portion 16 of the metal material for sealing the suction holes, the light from the photographing box 24 is diffusely reflected and becomes a white cloud with no metallic luster. The part appears.

[Experiment to detect white cloudy areas]
When the contact portion 33 is viewed through the glass plate with a laser microscope to measure the white cloudy portion, and the protruding portion 16 of the metal material for sealing the suction hole in contact with the glass plate interface is measured, the white cloudy portion has irregularities. A void was detected.

Therefore, in order to calculate the ratio of the white cloudy portion (white cloudiness ratio) in the contact portion 33, the portion outside the protruding portion 16 of the metallic material for sealing the suction holes is the illuminance from below the irradiation panel device 23. A large transmitted light is cut out as a background, the metallic luster portion and the white cloudy portion are binarized, and the ratio occupied by the white cloudy portion is calculated as a numerical value.
At the same time as the calculation of the white cloudiness rate, the white cloudy portion is a continuous portion (for example, the concept shown in FIG. 20) from the outer peripheral edge portion of the protruding portion 16 of the metal material for sealing the suction hole to the outer peripheral edge portion of the suction hole 4. The presence or absence of the white cloudy portion 18) as shown in the figure is also detected.

[Stress detector]
Further, in order to detect whether the vacuum of the gap V is maintained, the stress detection device 27 shown in FIG. 8 is used for examination.
In the stress detection device 27, the first polarizing plate 28 is placed on the irradiation panel device 23, the glass panel P for detection is placed on the first polarizing plate 28, and the first polarizing plate P is placed on the glass panel P. The two polarizing plates 29 are placed and installed so that the polarization directions of the first polarizing plate 28 and the second polarizing plate 29 are perpendicular to each other.
That is, the light from below by the irradiation panel device 23 is not transmitted by the first polarizing plate 28 and the second polarizing plate 29. However, if the gap V in the glass panel P between the first polarizing plate 28 and the second polarizing plate 29 is a vacuum or a substantially vacuum, it is pressed by atmospheric pressure and only the vicinity of the spacer 2 is polarized and light. Is transparent, and it is determined that there is no leak. On the other hand, if the gap V is at atmospheric pressure, polarized light is not generated in the vicinity of the spacer 2, so that the portion in the vicinity of the spacer 2 does not allow light to pass through and it is determined that there is a leak.

[Repeated bending test]
Further, the contact portion 33 of the glass panel P is generated by an external force such as wind pressure or pressure during wiping and cleaning, a temperature difference between the front and back surfaces of the glass plate 1A due to sunlight, a temperature difference between indoors and outdoors, and the like. Due to the warp phenomenon, the contact portion 33 of the protruding portion 16 of the metal material for sealing the suction holes with respect to the glass plate 1A is peeled off. As a result, a leak may occur in the gap V and the degree of decompression thereof may decrease. Therefore, it is necessary to measure the adhesion of the contact portion 33, and the next repeated bending test (warp durability test) is performed. Do.
As shown in FIGS. 9A, 9B, 9C, the peripheral portion V1 and the suction hole 4 are sealed with solder (metal material 15 for sealing the suction hole), the width is 200 mm, the length is 350 mm, and the sealing portion of the suction hole 4 is an end. A glass panel P located at a distance of 50 mm is supported by a hard rubber block 30 with a span of 267 mm on the left and right. Then, the central portion of the glass panel P is repeatedly loaded with a pressure block 31 having a diameter of 50 mm so that bending stress acts on the glass, and a stress inspection device is used to perform a test for leaks in the gap after the test. Detect the presence or absence.

The room temperature is 10 ° C. to 20 ° C., and the number of repetitions is 4000 times (1 time / day for 4000 days (for 10 years or more)), pushed for 4 seconds, and no load is applied for 1 second. In these tests, the amount of pushing in the central portion corresponding to the change in the environment (temperature difference 40 ° C., radius of curvature 24444 mm, deformation amount 0.36) is obtained.

[Acid resistance test]
Immerse the glass panel in H ₂ SO ₄ solution (5%) for 48 hours in order to measure the resistance to corrosion of the metal due to contact with an acidic cleaning agent or acidic solution at the protruding portion 16 of the metal material for sealing the suction holes. After that, a stress detector is used to detect the presence or absence of vacuum leaks in the gaps after the test.

[Alkali resistance test]
After immersing the glass panel P in a NaOH solution (1%) for 48 hours, the presence or absence of a vacuum leak in the gap after the test is detected using a stress detector.

The results of the above various durability tests are shown in Table 1 below.

From the results in Table 1, in the contact portion 33, the proportion of the white cloudy portion is 0.1% or more and 50% or less, there is no leakage from the suction hole 4 in the repeated test, and it can be normally used as a window glass for construction. A continuous portion showing a state, 0.1% or more to 30% or less, and a white cloudy portion extending from the outer peripheral edge portion of the protruding portion 16 of the metal material for sealing the suction hole to the outer peripheral edge portion of the suction hole 4. If the condition that the above is not formed is satisfied, it can be determined that there is acid resistance. Further, 0.1% or more and 10% or less, and the white cloudy portion is continuously provided from the outer peripheral edge portion of the protruding portion 16 of the metal material for sealing the suction hole to the outer peripheral edge portion of the suction hole 4. If the condition that the portion is not formed is satisfied, it can be determined that the portion has alkali resistance.

[Experimental Example 2]
In the measurement of the adhesion of the contact portion 33, when the metal material 15 for sealing the suction hole protrudes around the suction hole 4 on the surface of one glass plate 1A on the gap side, the adhesion of the contact portion 33 is improved. In order to measure with high accuracy, it is necessary to disassemble the glass panel P composed of a pair of glass plates 1A and 1B into separate glass plates 1A and 1B. Then, only the glass plate 1A in which the suction hole 4 is present is placed on the irradiation panel device 23 so that the surface on the gap side faces up, and the contact surface measuring device 26 measures.
However, on the surface of the glass plate 1A on the gap side, the suction hole sealing metal material 15 protruding from the suction hole 4 to the outside is removed from the single plate after disassembling the glass panel P composed of the glass plate 1A and the glass plate 1B12. If the surface of the glass plate 1A on the gap side remains outside the suction hole 4, the metal material 15 for sealing the suction hole is removed by polishing, and the contact surface measuring device 26 immediately takes a picture after the polishing process ( The imaging conditions are the same as in Experimental Example 1 described above). When a film is formed on the surface of the glass plate 1A on the gap side, the film is removed by polishing, and the contact surface measuring device 26 immediately takes an image after the polishing process.

[White cloudiness evaluation method]
As shown in FIG. 10, the light received by the camera 25 is recorded for each pixel by dividing the intensity of the light entering the light receiving unit into stages from 0 to 255. When the light refracted in the glass reaches the interface between the glass and the contact portion 33, if the contact portion 33 is a mirror surface, the light is reflected by the contact portion 33 and travels on the glass surface, so that the contact portion The light reflected by the contact portion 33 is not received by the camera 25 installed directly above the 33. On the other hand, when there is a foreign substance or the like on the contact portion 33, a part of the diffused reflection when the foreign matter is exposed to light enters the light receiving portion of the camera 25, so that the place where the foreign matter exists is reflected in white and comes into contact. The proportion of foreign matter present in the unit 33 can be detected.
At this time, if a glass plate or a film is present between the contact portion 33 and the camera 25, the amount of light reaching the contact portion 33 changes due to reflection from the interface. Since the amount of scattered light is proportional to the amount of incident light, the scattered light entering the light receiving portion of the camera 25 also changes in proportion to the amount of light reaching the contact portion 33.
Therefore, when evaluating in a multi-layered state, the threshold value of white turbidity is 60 to 245 under the condition that the film does not adhere to the glass surface in the multi-layered state. However, when the film is attached to the glass surface, the amount of light reaching the contact portion 33 changes due to the reflection by the film, and the white cloudiness threshold may change.
Therefore, in order to evaluate the white fogging rate, the double glazing is disassembled into a single plate, and the range of contrast recognized as white fogging on the single plate is as follows according to the amount of light reaching the contact portion 33. It was set in the procedure.
The contrast threshold on the single plate was adjusted so that it would be the same as the white turbidity analyzed on the double glazing, and the contrast threshold was set so that it would be the same as the white turbidity obtained on the double glazing. ..
When the double glazing is disassembled into a single plate, the solder in the suction hole 4 is cut in the suction hole 4, and diffused reflection occurs in that portion. Therefore, the area of the suction hole 4 is subtracted to form the contact portion 33. The white cloudiness rate was calculated. When the solder in the suction hole 4 protruded, serico polishing was performed so that it was flush with the glass surface. In that case as well, the suction hole 4 portion becomes white cloudy, so the white cloudiness rate of the contact portion 33 was calculated by subtracting the area portion of the suction hole 4.
As a result, as a result of setting the threshold value in the range of 57 to 245, it was found that the same value as the white cloudiness rate evaluated with the double glazing can be obtained. If a film is formed on the glass surface on the imaging surface side, evaluation is performed after removing the film by serico polishing.

By the way, as shown in the enlarged photographs of FIGS. 11A and 11B, FIG. 11A shows a state in which the proportion of the white cloudy portion is 10% or less. On the other hand, FIG. 11B shows a state in which the proportion of the white cloudy portion is more than 50%.
Further, the lower limit value of the ratio in the area ratio of the white cloudy portion includes a measurable finite value.

The present invention can be used as a glass panel having high heat insulating performance. For example, it should be used as a heat insulating glass panel that requires long-term durability for construction and vehicles (window glass for automobiles, railroad vehicles, ships, etc.), or for doors and walls of various devices such as refrigerators and heat insulating devices. Can be done.

[Another Embodiment]
1. The suction hole 4 and the metal material 15 for sealing the suction hole that covers the area around the suction hole are the metal material filled in the suction hole 4 and the metal material in the portion extending around the suction hole. It may have the same composition or different compositions.

[Metal sealing device for suction holes]
Hereinafter, the sealing of the suction holes will be described with reference to FIGS. 12 to 19.
In addition, the code and the name of each part may overlap with the code and the name used in the description of the above-described embodiment, or different names of each part may be used.

In the following embodiment, a spacer 2 is arranged between the pair of glass plates 1A and 1B to form a gap V, and the peripheral edges of both the glass plates 1A and 1B are joined with a peripheral sealing metal material 3. The gap V is airtightly sealed, and a suction hole 4 for sucking air in the gap V is provided so as to penetrate the front and back sides of one of the pair of glass plates 1A and 1B. In a certain glass panel, the suction hole sealing device 50 of the glass panel P that supplies the molten suction hole sealing metal material 15 to the suction hole 4 and seals the suction hole 4, and the molten suction hole sealing. The suction hole sealing method of the glass panel P for supplying the stop metal material 15 onto the suction hole 4 and the glass surface on the atmosphere side around the suction hole 4 to seal the suction hole 4 is described in detail. P is a so-called vacuum glass that sucks air in the gap from the suction hole 4 and seals the suction hole 4 with the suction hole sealing device 50.
[Background technology]

Conventionally, the suction hole sealing device and the suction hole sealing method of the glass panel are provided with a heating device for heating a metal material for suction hole sealing placed in the vicinity of the suction hole to bring it into a molten state, and heating the metal material. Use a device that crushes a metal material that has been heated to a molten state by the device and whose shape has been almost retained by surface tension so that the molten metal material flows into the suction holes with a cover material on which a weight is placed on the upper surface. Has been proposed (see, for example, Patent Document 1).
[Prior art literature]

[Patent Document]
[Patent Document 1] Japanese Unexamined Patent Publication No. 2002-137940
[Outline of Invention]
[Problems to be solved by the invention]

In the conventional suction hole sealing device and suction hole sealing method described above, a metal oxide film is often formed on the surface of a metal material that has been heated and melted. As shown in FIG. 19C, when crushed by the crushing device 160'(FIG. 19A → 19B), the metal oxide film 150' is torn into a disorderly size and shape, and the molten liquid suction hole sealing metal material 15 There is a problem that the glass plate flows into the contact portion with the atmosphere side of the glass plate (FIG. 19C), and a portion having a weak adhesion with the glass plate 1'A around the suction hole 4'is generated.

The present embodiment will be described below with reference to the drawings. In the drawings, the parts indicated by the same reference numerals as those of the conventional example indicate the same or corresponding parts.

In the glass panel P according to the present embodiment, as shown in FIG. 1, a spacer 2 is arranged between a pair of glass plates 1A and 1B to form a gap V, and a peripheral portion V1 of both glass plates 1A and 1B is formed. Is joined with a low melting point peripheral sealing metal material (solder) 3 to airtightly seal the gap V (peripheral sealing step (step S35)), and the suction hole 4 for sucking the air in the gap V Is provided so as to penetrate the front and back sides of one of the pair of glass plates 1A and 1B, and the air in the space inside the gap V is sucked from the suction hole 4 to vacuum or vacuum the gap V. The suction hole 4 is sealed with a suction hole sealing metal material 15 (suction hole sealing step) in a state of reduced pressure close to vacuum, and is configured as a vacuum panel.

Before depressurizing the air in the gap V in the vacuum sealing step, an ozone replacement step is performed in advance to clean the glass surface in the gap V.

That is, in the ozone replacement step, first, the inside of the gap V of the glass panel P is evacuated by a rotary pump (not shown). After the exhaust is completed, ozone flows into the gap V, and then the rotary pump is reconnected to perform vacuum exhaust in the gap V.

In the glass panel P, the suction hole sealing device 50 which sucks air from the suction hole 4 and exhausts it to the outside and then seals the suction hole 4 with the suction hole sealing metal material 15 is shown in FIG. It is configured as shown in FIG.

The suction hole sealing device 50 of the glass panel P has a heating section 60 that heats the solid suction hole sealing metal material 15 to its melting point, and the heating section 60 that heats and melts the metal material 15 to round the corners due to surface tension. A push-pin-shaped sharpened member 70 that can be pierced into the surface of the suction hole sealing metal material 15 and the molten metal that flows out from the piercing hole on the surface of the suction hole sealing metal material 15 formed by the sharpened member 70 are sucked. It has a molten metal guiding portion 80 that guides to the hole 4.

The heating unit 60 is provided with a funnel-type metal receiver 90 capable of receiving the suction hole sealing metal material 15 (a heating wire is wound around the outer peripheral portion of the receiver 90 to allow heating freely). .. Further, the supply port 100 for guiding the molten metal into the suction hole 4 is provided in the lower part of the receiving tool 90 and formed in the molten metal guiding portion 80. Further, in the suction hole sealing device 50, the sharpened member 70 is arranged above the receiver 90 via a compression spring 110, and the pin tip of the sharpened member 70 is pushed downward to seal the molten suction hole below. An operation mechanism 120 is provided so that the metal material 15 for stopping can be pierced vertically through and operated freely.

The supply port 100 uses an alumina cylindrical tube.
That is, the cylindrical tube made of ceramics such as alumina has a coefficient of linear expansion difference of 6 or more (preferably 17 or more) from solder (metal material 15 for sealing suction holes) as shown in Table 2 below, and is cooled. Since the shrinkage rate at the time is smaller than that of the solder, the adhesion between the solder and the cylindrical tube is poor, and therefore the solder and the supply port 100 do not stick to each other.

Further, the suction hole sealing device 50 has a cup 130 that can be brought into close contact with the glass plate 1A so as to surround the suction hole 4, and inside the cup 130, a heating unit 60, a receiver 90, and a receiver 90 are provided. , The molten metal induction portion 80 is formed so as to be accommodating. Further, the cup 130 is provided with an intake unit capable of decompressing the inner space of the cup 130 and a pin pushing operation device 140 capable of operating the operation mechanism 120 from the outside of the cup 130 while keeping the inside of the cup 130 airtight. There is.

That is, the suction hole sealing metal material 15 heated and melted by the heating unit 60 by the suction hole sealing device 50 becomes a liquid mass having a substantially angled shape due to surface tension (see FIG. 12). Even if the oxide film 150 is formed on the surface of the suction hole sealing metal material 15, such as the thin skin of an egg, by piercing the surface with the sharpened member 70, a hole is formed in the pierced portion of the oxide film 150. It is formed (see FIG. 13), and molten metal mainly flows out from the piercing portion (see FIGS. 14 and 16). Since the outflowing molten metal is guided to the suction hole 4 by the molten metal induction portion 80, it becomes easy to prevent the metal oxide from being mixed into the suction hole 4 (see FIG. 15).
Therefore, the suction hole sealing metal material 15 adheres to the suction hole 4 and the contact portion 33 with the glass surface around the suction hole 4 in a state where the metal oxide is not mixed, thereby ensuring the airtightness of the gap V. it can.

[Another Embodiment]
Other embodiments will be described below.
In the following other embodiments, the same members as those in the above embodiments are designated by the same reference numerals.
<1> The metal material 15 for sealing the suction hole of the suction hole 4 is pierced by the sharpened member 70 in a molten state, but in the embodiment, as shown in FIGS. 12 to 16, from top to bottom. I stabbed it so that it would penetrate. Instead, as shown in FIGS. 18A to 18B, the lower surface of the molten metal material is pierced from diagonally below, or the side surface of the molten metal material is pierced as shown in FIGS. 17A to 17B to seal the suction holes. Even if the surface of the stopping metal material 15 is covered with the oxide film 150, a high-purity molten metal material may be poured into the suction holes 4.
Since FIGS. 17 and 18 are explanatory views, the horizontal line representing the step portion on the flow path of the suction hole sealing metal material 15 is omitted.

As described above, although the reference numerals are given for convenience of comparison with the drawings, the present invention is not limited to the configuration of the attached drawings. In addition, it goes without saying that it can be carried out in various aspects without departing from the gist of the present invention.

In the above embodiment, the pair of glass plates facing each other, the gap formed by arranging a spacer between the pair of glass plates, and the peripheral edge portion of the pair of glass plates are joined to make the gap airtight. A glass panel provided with a peripheral sealing metal material to be sealed, and one of the pair of glass plates has a suction hole that penetrates the front and back sides of the glass plate and sucks air in the gap. In the glass panel suction hole sealing device 50 for supplying the molten suction hole sealing metal material 15 to the suction hole 4 and sealing the suction hole 4, the suction hole sealing metal material. A heating unit 60 that heats 15 to its melting point, a sharpened member 70 that can pierce the surface of the suction hole sealing metal material 15 in the heating unit 60, and the suction hole sealing metal material 15 by the sharpened member. It has a molten metal guiding portion 80 that guides the molten metal flowing out from the piercing portion of the above to the suction hole 4. The effect of the suction hole sealing device 50 is that the metal material heated and melted by the heating unit 60 becomes a liquid mass having a substantially angular angle due to surface tension (see FIG. 12), and on the surface thereof, for example, an egg. Even if the oxide film 150 is formed like a thin skin, by piercing the surface with the sharpened member 70, a hole is formed in the puncture portion of the oxide film 150 (see FIG. 13), and the piercing portion mainly melts. Since the metal flows out (see FIGS. 14 and 16) and the molten metal is guided to the suction hole 4 by the molten metal guiding portion 80, it becomes easy to prevent the metal oxide from being mixed into the suction hole 4 (FIG. 15). reference).
Therefore, on the suction hole 4 and the glass surface around it, the metal material 15 for sealing the suction hole adheres to the contact portion 33 of the glass plate with the atmospheric side surface in a state where the metal oxide is not mixed, and the gap portion is formed. Airtightness can be ensured.

Further, the suction hole sealing device 50 described above has a funnel-type receiver 90 in which the heating unit 60 receives the suction hole sealing metal material 15, and a supply port for guiding molten metal into the suction hole 4. 100 is provided in the lower part of the receiver 90 and is formed in the molten metal guiding portion 80, and the sharpened member 70 is arranged above the receiver 90 and the metal material below is provided by the sharpened member 70. It has an operation mechanism 120 that allows the vertical penetration and piercing operation to be freely performed. The effect of the suction hole sealing device 50 is that the metal material 15 for sealing the suction holes is placed on the receiver 90 and heated, so that the metal material on the funnel type receiver 90 can be removed by surface tension. If it becomes a liquid mass and the oxide film 150 is not formed on the surface thereof and the fluidity is good, the molten metal flows into the suction hole 4 from the supply port 100 provided at the lower part of the receiver 90 and the suction hole 4 is sealed.
However, even if the oxide film 150 is formed on the surface of the molten metal and the fluidity is lowered, the sharpening member 70 is melted by the operation mechanism 120 onto the metal material which is a liquid mass from above. By piercing the metal so as to penetrate downward, a piercing hole is formed on the lower side, and the molten metal is mainly flowed down from the piercing hole to the suction hole 4 through the supply port 100 without involving the metal oxide film 150. To.
Therefore, the suction hole 4 can be hermetically sealed with a metal material by the suction hole sealing device 50 having a simple structure.

Further, the suction hole sealing device 50 described above is a vacuum panel in which the glass panel P seals the gap V in a reduced pressure state, and is in close contact with the glass plate so as to surround the suction hole 4. The free cup 130 is provided, and the heating portion 60, the receiver 90, and the molten metal guiding portion 80 are formed inside the cup 130 so as to be able to accommodate the heating portion 60, and the inner space of the cup 130 is depressurized. A possible intake portion is provided in the cup 130, and the operating mechanism 120 is configured to be operable from outside the cup 130. The effect of the suction hole sealing device 50 is that the cup 130 is brought into close contact with the glass plate so as to surround the suction hole 4 formed in the glass plate, so that the gap V is formed from the intake portion provided in the cup 130. Can be decompressed. Moreover, the suction hole sealing metal material 15 previously placed on the receiver 90 is heated and melted by the heating unit 60 in the cup, and the operation mechanism 120 is operated from the outside of the cup 130 to form the metal material on the receiver 90. It is possible to pierce the sharpened member 70 and mainly supply molten metal to the lower suction hole 4 to seal the suction hole 4.
Therefore, the gap V can be depressurized and the suction hole 4 can be sealed with a compact device.

A pair of glass plates facing each other, a gap portion V formed by arranging a spacer 2 between the pair of glass plates 1A and 1B, and a peripheral portion of the pair of glass plates 1A and 1B are joined to form the gap portion. A metal material for peripheral sealing that airtightly seals V is provided, and a suction hole for sucking air in the gap V is passed through the front and back of one of the pair of glass plates 1A and 1B. A solid suction hole sealing method for a glass panel in which a molten metal material 15 for sealing a suction hole is supplied to the suction hole 4 to seal the suction hole 4. The suction hole sealing metal material 15 is heated to its melting point, the surface of the suction hole sealing metal material 15 is pierced by a sharpened member 70, and the suction hole sealing metal material 15 is pierced by the sharpened member 70. The molten metal material is discharged from the piercing portion and supplied to the suction hole 4 to seal the suction hole 4. The effect of this suction hole sealing method of the glass panel is that the metal material melted by heating to the melting point becomes a liquid mass with a substantially angular angle due to surface tension, and an oxide film is formed on the surface thereof, for example, like a thin skin of an egg. Even if the 150 is formed, by piercing the surface with the sharpened member 70, a hole is formed in the piercing portion of the oxide film 150, the molten metal mainly flows out from the piercing portion, and the metal oxide 150 is the suction hole 4 The molten metal can be supplied to the surface of the glass on the atmosphere side around the suction hole 4 without being mixed with the suction hole 4.
Therefore, on the suction hole 4 and the glass surface around it, the suction hole sealing metal material 15 adheres to the contact portion 33 on the atmospheric side glass surface around the suction hole 4 in a state where the metal oxide 150 is not mixed. , The airtightness of the gap V can be ensured.

1A, 1B: Glass plate 2: Spacer (pillar) 3: Peripheral sealing metal material (solder) 4: Suction hole, 4e: Edge, 5: Metal introduction device, 6: Surface plate, 6a: High part , 6b: Low part, 7: Supply tower, 8: Introduction plate, 8A: Bending part, 9: Crucible part, 10: Heat transfer heater, 11: Introduction path, 12: Rail member, 13: Moving mechanism, 14: Open Tip part, 15: Metal material for suction hole sealing (solder), 16: Overhanging part (protruding part) of metal material for suction hole sealing, 33: Contact part, V: Gap part, V1: Peripheral part, P: Glass panel, Dw: protruding part diameter, Dg: protruding part thickness, Tg: glass plate thickness, Pd: spacer pitch (interval), Rw: width, Sw: suction hole diameter

Claims (6)

A pair of facing glass plates and
A gap formed by arranging a spacer between the pair of glass plates,
A metal material for peripheral sealing is provided by joining the peripheral edges of the pair of glass plates over the entire circumference and airtightly sealing the gaps.
One of the pair of glass plates has a suction hole that penetrates the front and back of the glass plate and sucks air in the gap, and the gap is depressurized through the suction hole. A glass panel having a suction hole and a metal material for sealing the suction hole that seals the suction hole by covering the area around the suction hole.
At the protruding portion of the suction hole sealing metal material formed around the suction hole on the atmospheric side surface of the one glass plate, the contact portion of the one glass plate with the atmospheric side surface and the other A glass panel in which the white cloudy part where light is diffusely reflected and glows white when viewed from the glass plate side is 50% or less in terms of area ratio. In the glass panel according to claim 1, the ratio of the white cloudy portion is further set to 30% or less, and the white cloudy portion is said to be from the outer peripheral edge portion of the protruding portion of the metal material for sealing the suction holes. A glass panel that does not form a continuous portion leading to the outer peripheral edge of the suction hole. In the glass panel according to claim 1 or 2, the proportion of the white cloudy portion is further set to 10% or less, and the white cloudy portion is the outer peripheral edge portion of the protruding portion of the metal material for sealing the suction holes. A glass panel that does not form a continuous portion from the surface to the outer peripheral edge of the suction hole. The glass panel according to any one of claims 1 to 3, wherein the white cloudy portion is an oxide of the metal material for sealing the suction holes. The main component of the suction hole sealing metal material contains any of Zn, Al, Si and Ti with respect to Sn of 72 to 99.9%, and the lead content is% by weight. The glass panel according to any one of claims 1 to 4, which is less than 0.1%. The glass panel according to any one of claims 1 to 5, wherein the lower limit of the ratio of the white cloudy portion to the area ratio includes a measurable finite value.

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