WO2019093320A1

WO2019093320A1 - Glass panel

Info

Publication number: WO2019093320A1
Application number: PCT/JP2018/041177
Authority: WO
Inventors: 稲岡　大介; 田口　雅文; 藤野　一也; 哲男皆合
Original assignee: 日本板硝子株式会社
Priority date: 2017-11-10
Filing date: 2018-11-06
Publication date: 2019-05-16
Also published as: JP7142644B2; JP2022119918A; JPWO2019093320A1; JP7309016B2

Abstract

Provided is a glass panel in which a sealed state is maintained for a long period of time in the protruding part of a metal material for sealing a suction hole formed around the periphery of the suction hole on the atmospheric side of one of the glass sheets. A glass sheet 1A which is one of a pair of glass sheets 1A, 1B has a suction hole 4 through which is sucked air within the gap portion V between the pair of glass sheets 1A and 1B, the hole passing through from the front to the rear of the glass sheet 1A; and a metal material for sealing the suction hole, which seals the suction hole 4 by covering the suction hole 4 and the periphery of the suction hole 4 in a state in which the gap V is depressurized via the suction hole 4. At the protruding part 16 of the metal material for sealing suction hole which is formed around the periphery of the suction hole 4 on the atmosphere-side surface of one glass sheet 1A, at the contact portion 33 with the atmosphere-side surface of the one glass sheet 1A, a white haze portion through which light is irregularly reflected and shines whitely when viewed from the other glass sheet 1B side is set so as to have a surface area ratio not exceeding 50%.

Description

Glass panel

In the present invention, the pair of opposing glass plates, the gap formed by arranging the spacer between the pair of glass plates, and the peripheral portion of the pair of glass plates are joined along the entire periphery thereof And a metal material for peripheral sealing that hermetically seals the gap, wherein one of the pair of glass plates is a suction that penetrates the front and back in the glass plate and sucks the air in the gap. And a suction hole sealing metal material for sealing the suction hole by reaching and covering the suction hole and the periphery of the suction hole in a state where the gap is decompressed through the suction hole. It relates to the glass panel.

Heretofore, there has been no glass panel in which the state of the sealing portion of the suction hole by the suction hole sealing metal material has been defined (the corresponding known document is not found).

In the above-mentioned conventional glass panel, the sealing portion of the suction hole by the suction hole sealing metal material is for sealing the suction hole formed on the atmosphere side surface of the one glass plate around the suction hole. In the protruding portion of the metal material, if the adhesion of the contact portion with the atmosphere side surface of the one glass plate is sufficient, the reduced pressure state in the gap is maintained long, but if it is insufficient, the glass plate On the other hand, suction holes to the glass plate due to external pressure such as wind pressure and pressure during cleaning and cleaning, a temperature difference between the front and back of the glass plate due to solar radiation, and a warping phenomenon caused by temperature differences inside and outside the room There is a problem that the contact portion of the protruding portion of the sealing metal material may be peeled off, a leak may occur to the gap, and the pressure reduction degree may decrease.

Therefore, the 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 atmosphere side surface of one glass plate To provide a glass panel to be

According to a first characteristic configuration of the present invention, a pair of opposing glass plates, a gap formed by arranging a spacer between the pair of glass plates, and a peripheral portion of the pair of glass plates all around And a peripheral sealing metal material for sealing the gap airtightly by bonding over the entire surface, and one glass plate of the pair of glass plates is penetrated to the front and back in the glass plate, and the inside of the gap is formed. A suction hole for suctioning the air, and the suction hole sealing the suction hole by sealing the suction hole by reaching the suction hole and the periphery of the suction hole in a state where the gap is decompressed through the suction hole A glass panel having a metallic material for use in the suction hole sealing metal material formed around the suction hole on the atmosphere-side surface of the one glass plate, the one glass plate In contact with the atmosphere side surface of the Square white cloudy portion shining white and light is irregularly reflected is less than 50% in the area ratio when viewed from the glass plate side of the.

According to the first feature configuration of the present invention, when the white clouding rate at the protruding portion of the suction hole sealing metal material is greater than 50%, the wind pressure on the glass plate or the pressure at the time of wiping and cleaning is increased. When an external force such as, for example, acts on the glass plate, a temperature difference between the front and back of the glass plate due to solar radiation, or a warping phenomenon caused by a temperature difference between the indoor and outdoor, the protrusion of the suction hole sealing metal material against the glass plate The contact portion is peeled off, a leak occurs to the gap, and the pressure reduction degree of the gap can not be maintained. On the other hand, in the protruding portion of the suction hole sealing metal material, a white clouding portion in which light is irregularly reflected and glows white when viewed from the other glass plate side at the contact portion with the atmosphere side surface of the one glass plate. If the area ratio is set to 50% or less, the contact portion of the protruding portion of the suction hole sealing metal material against the glass plate is not peeled off even if the above-mentioned external force or warpage phenomenon acts. The degree of pressure reduction in the gap can be maintained.

According to a second characteristic configuration of the present invention, the ratio of the white clouding portion is further set to 30% or less, and the white clouding portion is the outer peripheral edge portion of the protruding portion of the suction hole sealing metal material. It is in the place which does not form the connection part which reaches the outer periphery of the suction hole.

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

According to a third characterizing feature of the present invention, the ratio of the white clouding portion is set to 10% or less, and the white clouding portion is the outer peripheral edge portion of the protruding portion of the suction hole sealing metal material. The continuous portion leading to the outer peripheral edge portion of the suction hole is not formed.

According to the third aspect of the present invention, it is possible to expect not only acid resistance but also alkali resistance, needless to say having durability against the above-mentioned external force and warpage phenomenon.

That is, when it is used for a window glass of a building, an alkaline detergent is often used to wipe the window glass, etc., and even in that case, if the ratio of the white cloudy part is 10% or less, it is white. Even if the cloudy portion is attacked by alkali, leak in the gap can be prevented without peeling off the contact portion.

According to a fourth characterizing feature of the present invention, the white mist portion is an oxide of the suction hole sealing metal material.

According to a fifth characterizing feature of the present invention, the main component of the suction hole sealing metal material contains any one of Zn, Al, Si and Ti with respect to 72 to 99.9% of Sn. Lead content is less than 0.1% by weight.

According to the fifth aspect 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.

According to a sixth aspect of the present invention, the lower limit value of the ratio in the area ratio of the white cloudy portion includes a measurable finite value.

It is a partially cutaway perspective view of a glass panel. It is a longitudinal cross-sectional view of the suction hole periphery of a glass panel. It is a flowchart which shows the manufacturing method of a glass panel. It is a principal part longitudinal cross-sectional view which shows a periphery sealing step. It is operation | movement explanatory drawing of an introduction board. It is a suction hole peripheral part enlarged view before suction hole sealing. It is a schematic explanatory drawing of a contact surface measuring device. It is a longitudinal cross-sectional view of a stress detection apparatus. It is a schematic plan view of a repetition bending test. It is a schematic side view of a repetition bending test. It is the schematic of a repetition bending test, Comprising: It is a top view which shows the position of the pressing part by a glass panel and a pressing block. It is a longitudinal cross-sectional explanatory view showing refraction and reflection of light to a glass panel. (A) shows a state in which the white haze rate is 10% or less in an enlarged photograph of the protruding portion of the suction hole sealing metal material. The enlarged photograph of the protrusion part of the suction hole sealing metal material shows the case where the white haze rate is more than 50%. The longitudinal cross-sectional view of a suction hole sealing apparatus, It is the state before piercing the metal material for sealing with a sharp-point member. The longitudinal cross-sectional view of a suction hole sealing apparatus, It is a state when piercing metal material for sealing with a sharp-point member. The longitudinal cross-sectional view of a suction hole sealing apparatus, It is a state when piercing metal material for sealing with a sharp-point member. The longitudinal cross-sectional view of a suction hole sealing apparatus, It is the state after sticking the metal material for sealing with a sharp-point member. It is a longitudinal cross-sectional view of a molten metal induction | guidance | derivation part. The principal part longitudinal cross-sectional view of another embodiment WHEREIN: The state before a sharpening member pierces the metal material for sealing is shown. The principal part longitudinal cross-sectional view of another embodiment WHEREIN: The state when a sharp point member pierces the metal material for sealing is shown. The principal part longitudinal cross-sectional view of another embodiment WHEREIN: The state when a sharp point member pierces the metal material for sealing is shown. The principal part longitudinal cross-sectional view of another embodiment WHEREIN: The state after the sharp point member pierces the metal material for sealing is shown. The principal part longitudinal action explanatory drawing of the suction hole sealing apparatus of a prior art example, and shows the state before crushing the metal material for sealing. The principal part longitudinal action explanatory drawing of the suction hole sealing apparatus of a prior art example, the state in the middle of crushing the metal material for sealing is shown. The principal part longitudinal action explanatory drawing of the suction hole sealing apparatus of a prior art example WHEREIN: The state which crushed the metal material for sealing is shown. It is a conceptual diagram of a white cloudy part.

Embodiments of the present invention will be described below based on the drawings.
In FIG. 1, the glass panel P is formed by interposing a plurality of columnar spacers 2 with a constant spacer pitch Pd in a matrix shape between a pair of

opposing glass plates

1A and 1B and a pair of

glass plates

1A and 1B. A gap V to be formed, a peripheral sealing metal material 3 for sealing the peripheral portion V1 of the gap V, and a suction hole 4 penetrating one glass plate 1A of the pair of

glass plates

1A and 1B Have. The suction hole 4 is sealed with a suction hole sealing metal material 15 which extends to cover 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 depressurized to 1.33 Pa (1.0 × 10 ^-2 Torr) or less. This is because the air in the gap V is depressurized by discharging the air inside the air through the suction hole 4, and the peripheral sealing metal material 3 and the suction hole are sealed to maintain the depressurized state of the gap V It is sealed by the metal material 15 for the purpose.

The spacer 2 is cylindrical and has a diameter of about 0.3 to 1.0 mm and a height of about 30 μm to 1.0 mm. The spacer 2 is a material which does not buckle even when subjected to a compressive stress caused by the atmospheric pressure acting on the

glass plates

1A and 1B, for example, a compressive strength of 4.9 × 10 ⁸ Pa (5 × 10 ³ kgf / cm ² ) It is formed of the above material, preferably stainless steel (SUS 304) 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) of predetermined thickness made of float glass are respectively cut into predetermined dimensions, for example, 1200 mm × 900 mm, and

glass plates

1A and 1B having the same shape and size are prepared. (Step S31) The suction hole 4 is drilled in the vicinity of one of the four corners of the glass plate 1A by a drill or the like (Step S32) (drilling step).

Next, in a space such as a clean room or chemical clean room where the state of air contamination can be controlled chemically or physically, a pair of glass plates using at least one method of pure water brush washing, liquid washing and

light washing

1A and 1B are washed (step S33) (washing step). In this liquid cleaning method, pure water, deionized water or the like is used. Also, the cleaning solution contains, for example, an alkaline detergent or ozone water. In addition, an abrasive may be contained in the cleaning solution. 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 at a constant spacer pitch Pd on the cleaned glass plate 1B in which the suction holes 4 are not provided, and the cleaned glass plates 1A are overlapped to form a pair of The

glass plates

1A and 1B are paired (step S34).

Furthermore, the pair of

glass plates

1A and 1B is held substantially horizontal, and the peripheral sealing portion V1 of the pair of

glass plates

1A and 1B is formed 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 describe peripheral sealing in step S35 of FIG.
In FIG. 4, the metal introducing device 5 has a surface plate 6 formed in a step shape having a high portion 6a and a low portion 6b lower than the high portion 6a, and the high portion 6a has a pair of glass plates 1A , And 1B, and the supply tower 7 that supplies solder to the pair of

glass plates

1A and 1B in the lower portion 6b. In the lower portion 6b of the step-like surface plate 6, two rail members 12 are disposed along the pair of

glass plates

1A and 1B, and the feed tower 7 is disposed on the moving mechanism 13 traveling on the rail members 12. Is placed on the

The feed tower 7 includes a ridge portion 9 having a rectangular cross-sectional shape for storing liquid phase or solid phase solder, and an electrothermal heater 10 incorporated in the side wall portion of the ridge portion 9 and heating the solder stored in the ridge portion 9. And an introduction passage 11 having a long cross section, which communicates with the bottom of the collar 9 and opens toward the outside of the peripheral portion V1 of the pair of

glass plates

1A and 1B, and is disposed horizontally in the middle of the introduction passage 11 And an introduction plate 8. The lead-in plate 8 is extended from the lead-in path 11 and fitted into the peripheral portion V1 of the pair of

glass plates

1A and 1B, whereby the solder intrudes into the gap V together with its surface tension. In addition, the gravity of the solder at the liquid level ΔH in the collar portion 9 is applied to the solder at the site of the introduction plate 8, thereby promoting the penetration of the solder into the peripheral portion V1 of the pair of

glass plates

1A and 1B. .

Further, as shown in FIG. 5, the introducing plate 8 may have a shape in which bending portions 8A in a state of being waved up and down several times in the moving direction are formed at two places at intervals (bellows shape).
That is, by the movement of the introduction plate 8 having the bending portion 8A, the bending portion 8A having a spring action lightly rubs the surface of the glass plate, and the adhesion of the solder to the glass surface is further improved. The effect of ensuring the airtightness of Part V can be exhibited.

Further, the introducing plate 8 may have a bow shape having a spring action or a flat plate having no bent portion. However, for the reasons described above, the introduction plate 8 having the bending 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 portion V1 of the pair of

glass plates

1A and 1B, the introduction plate 8 is moved from the groove 14 of the pair of

glass plates

1A and 1B. When inserted into the gap V, the peripheral sealing metal material 3 penetrates the entire peripheral portion V1 of the pair of

glass plates

1A and 1B through the introduction plate 8. Thus, the peripheral portion V1 of the gap V formed between the pair of

glass plates

1A and 1B is airtightly sealed by the peripheral sealing metal material 3.

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

In the following step S36, the suction cup 4 is attached to the main surface on the atmosphere side of the glass plate 1A so as to cover the suction hole 4 with the exhaust cup in the vicinity of the suction hole 4 In order to reduce the pressure in the gap portion V to 1.33 Pa or less by suction, vacuuming is performed to discharge gas molecules in the gap portion V to the outside (step S36).

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

Subsequently, 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 ).
Thus, the gap V formed between the pair of

glass plates

1A and 1B is sealed.

Among the above-described steps, the main surfaces of the pair of

glass plates

1A and 1B are washed (step S33), and the glass surface in the vicinity of the suction holes 4 and the metal material 15 for sealing the suction holes are adhered to seal The respective steps up to stopping (step S37) are respectively carried out in a space where chemical contamination of air can be controlled chemically or physically.

In the present embodiment, the pair of

glass plates

1A and 1B are cleaned using a liquid cleaning method. However, the present invention is not limited thereto. A pure water brush cleaning method, an ultrasonic cleaning method, an alkaline water cleaning method, a heating cleaning method The pair of

glass plates

1A and 1B may be cleaned using at least one of vacuum (freezing) cleaning, UV cleaning, ozone cleaning, and plasma cleaning. Thereby, generation | occurrence | production of the gas molecule which can be decomposed | disassembled or scattered from the main surface of a pair of

glass plate

1A, 1B can be suppressed, and the initial performance of glass panel P can be exhibited over a long time.

In the present embodiment, Ti is used as the peripheral sealing metal material 3 in a solder having a melting temperature of 250 ° C. or less, for example, a solder having a composition of 91.2 Sn-8.8 Zn (eutectic point temperature: 198 ° C.). The peripheral portion V1 of the pair of

glass plates

1A and 1B is sealed using the added solder. However, the peripheral sealing metal material 3 (solder) is not limited thereto, and at least one material selected from the group consisting of Sn, Cu, In, Bi, Zn, Pb, Sb, Ga, and Ag. The peripheral portion V1 of the pair of

glass plates

1A and 1B may be sealed using a sealing material having a melting point of 250 ° C. or less.

The peripheral sealing metal material 3 may include at least one material selected from the group consisting of Al, Cr, and Si instead of or in addition to Ti. Thereby, the adhesiveness of the peripheral sealing metal material 3 and the glass component of a pair of

glass plate

1A, 1B can be improved.

In this embodiment, as the suction hole sealing metal material 15, a solder having a melting temperature of 250 ° C. or less, for example, a solder having a composition of 91.2 Sn-8.8 Zn (eutectic point temperature: 198 ° C.) is used. The suction hole 4 is sealed using the solder added. However, the suction hole sealing metal material 15 (solder) is not limited thereto, and at least one selected from the group consisting of Sn, Cu, In, Bi, Zn, Pb, Sb, Ga, and Ag. The suction holes 4 may be sealed using a sealing material which is a metal material containing a material and whose melting temperature is 250 ° C. or less.
When Sn is selected, 90% or more is sufficient, 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 include at least one material selected from the group consisting of Al, Cr, and Si instead of or in addition to Ti.
Furthermore, the suction hole sealing metal material 15 may use solder of a component different from the peripheral sealing metal material 3.
The adhesion of the glass is improved by incorporating Ti (titanium) in the suction hole sealing metal material 15 or the peripheral sealing metal material 3.

In the present embodiment, the pressure in the gap portion V is reduced to 1.33 Pa or less. However, the present invention is not limited to this, and the pressure in the gap portion V may be reduced to substantially vacuum. Thereby, the heat insulation performance of glass panel P can further be raised.

In the present embodiment, the lower limit of the pair of glass plate thicknesses Tg is 0.3 mm or more. Moreover, Preferably it is 0.5 mm or more. More preferably, it is 1 mm or more. The amount of heat stored in the glass itself decreases if the pair of glass plates has a small thickness Tg, so the amount of heat released into air per unit time increases during peripheral sealing, and the peripheral sealing metal material 3 is cooled. It is easy to be done. Therefore, it becomes possible to accelerate the solidification of the molten peripheral sealing metal material 3. However, since the rigidity of a glass plate will fall when a glass plate becomes thin, the deformation amount of the glass plate by the external force of the same magnitude | size becomes large. Therefore, in the glass panel P, the tensile stress generated in the vicinity of the surface of the suction hole 4 on the side of the gap increases.

The upper limit of the pair of glass plate thicknesses Tg is 15 mm or less. Preferably, it is 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 the amount of deformation of the glass plate due to the same external force is reduced. Therefore, in the glass panel P, since the tensile stress generated near the surface of the suction hole 4 on the side of the gap is reduced, the long-term durability is improved. On the other hand, when the glass plate thickness Tg is increased, the amount of inflow of the suction hole sealing metal material 15 into the suction holes 4 is reduced when the suction holes are sealed. Therefore, the protrusion of the suction hole sealing metal material 15 on the gap side becomes small, and it becomes difficult to relieve the tensile stress generated in the vicinity of the surface of the suction hole 4 on the gap side.

Although a pair of

glass plate

1A, 1B is float glass, it is not restricted to this. The pair of

glass plates

1A and 1B may be, for example, template glass, frosted glass provided with a light diffusing function by surface treatment, meshed glass, lined glass plate, tempered glass, double tempered glass according to the application as described above. Various glasses such as low reflection glass, high transmission glass plate, ceramic glass plate, special glass having a heat ray or ultraviolet absorbing function, or a combination thereof can be appropriately selected and used.
Furthermore, as to the composition of the pair of

glass plates

1A and 1B, soda silica glass, soda lime glass, borosilicate glass, aluminosilicate glass, various kinds of crystallized glass and the like can be used.

In the present embodiment, the beveled portion 14 chamfers the corner portion on the gap portion V side of the

glass plates

1A and 1B into a planar shape, but the present invention is not limited to this. If it is a form which makes insertion board 8 easy to insert, it can select suitably and can provide in

glass board

1A and 1B.

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

Moreover, although the spacer 2 is formed of stainless steel, it is not limited to this. The spacer 2 is, for example, metal such as inconel, iron, aluminum, tungsten, nickel, chromium, titanium, carbon steel, chromium steel, nickel steel, nickel chromium steel, manganese steel, chromium manganese steel, chromium molybdenum steel, silicon steel, It may be formed of an alloy such as brass, solder, duralumin, or one having high rigidity such as ceramic or glass. Also, the spacer 2 is not limited to a cylindrical shape, and may have various shapes such as an angular shape or a spherical shape.

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

In the gap V, an evaporation getter is used to adsorb gas molecules in the gap V, or a non-evaporation getter that adsorbs and removes gas molecules by heating and activation is used. Alternatively, the non-evaporable getter and the evaporable getter may be used in combination. In the gap portion V, the getter material (adsorbent) and the adsorbent accommodation hole may be two or more.

In the present embodiment, although the peripheral sealing metal material 3 is formed using the metal introduction device 5, it is not limited to this. The peripheral sealing metal material 3 may be formed using any one of an anodic bonding method, an ultrasonic bonding method, a multistage bonding method, a laser bonding method and a pressure bonding method. Thereby, the adhesiveness to the pair of

glass plates

1A and 1B of the peripheral sealing metal material 3 can be improved.

Further, the width Rw of the peripheral sealing metal material 3 in the thickness direction view with respect to the plane of the glass panel P is 1 mm or more and 10 mm or less. If the width Rw is smaller than 1 mm, it will be difficult to maintain the seal of the gap V of the glass panel P. 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 holding the sealing of the gap portion V of the glass panel P, the amount of heat exchange can be further reduced.

In the present embodiment, a portion where the suction hole sealing metal material 15 after sealing protrudes from the atmosphere side surface of the glass plate 1A is referred to as a protruding portion 16. The protrusion diameter Dw of the protrusion 16 (the same as the width of the contact portion 33 in contact with the glass plate 1A of 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 any case.
Further, the protrusion thickness Dg of the protrusion 16 is 0.1 to 20 mm. Preferably, it is 0.1 to 10 mm.

In the present embodiment, the suction hole diameter Sw is 2 to 10 mm. Preferably, it is 2 to 5 mm. In the case of tempered glass, the suction pore size Sw is preferably larger than the glass thickness and 10 mm or less. This is to allow the wind to pass through the suction holes 4 at the time of air cooling and strengthening.

In addition, at least one of the upper and lower edges of the suction hole 4 may be formed in a curved surface shape or may be chamfered (a small surface may be provided on the edge).

In the sealing portion of the suction hole 4 by the suction hole sealing metal material 15, a protrusion (the suction hole sealing metal material is formed around the suction hole 4 on the atmosphere side surface of one glass plate 1A The adhesion at the contact portion 33 with the atmosphere-side surface of one of the glass plates 1A is important for the protruding portion 16). If the metallic gloss of the suction hole sealing metal material 15 is sufficient when viewed from the back side of one glass plate 1A on all the contact portions 33, sufficient adhesion is achieved, and the reduced pressure state in the gap V is maintained for a long time . However, if the adhesion is insufficient, an external force such as wind pressure or pressure at the time of wiping and cleaning acts on the glass plate 1A, a temperature difference between the front and back of the glass plate 1A due to solar radiation, The contact portion 33 of the protruding portion 16 of the suction hole sealing metal material with respect to the glass plate 1A is peeled off by the warpage phenomenon generated due to the temperature difference or the like. Then, since there is a possibility that the leak to the gap V occurs to reduce the degree of pressure reduction, it is necessary to measure the adhesion of the contact portion 33.

The main component of the suction hole sealing metal material contains any component among Zn, Al, Si and Ti with respect to Sn of 72 to 99.9%, and the content of lead is heavy. It is less than 0.1% in%.

[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 conducted.

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

The illumination panel device 23 has two fluorescent lamps 10W, a color temperature of 5000K, and an illuminance of 5500lx, and the photographing box 24 is provided with a 27W fluorescent lamp (daylight color) and an illuminance of 4800lx.
The camera setting is set to an F-number of 3.5, a shutter speed of 1/200 sec, and an ISO speed of 100.

When the suction hole sealing metal material 15 adheres to the glass plate 1A as measured by the contact surface measuring device 26 at the contact portion 33, it becomes metallic luster and it becomes 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 a portion with adhesion failure or impurities such as metal oxide are deposited on the protruding portion 16 of the suction hole sealing metal material, the light from the photographing box 24 is irregularly reflected to cause white gloss without metallic gloss. Department appears.

[Detection experiment of the white cloudy area]
When measuring the white clouded part, when the protruding part 16 of the suction hole sealing metal material in contact with the glass plate interface is measured by looking at the contact part 33 through the glass plate with a laser microscope, the white clouded part has unevenness. A void was detected.

Therefore, in order to calculate the ratio (white clouding ratio) of the white clouding portion in the contact portion 33, the portion outside the protruding portion 16 of the suction hole sealing metal material has the illuminance from under the irradiation panel device 23. A large transmitted light is separated as a background, and the metallic gloss portion and the white overcast portion are binarized, and the ratio of the overcast portion is obtained as a numerical value.
Note that, at the same time with the calculation of the whitening rate, a continuous portion from the outer peripheral edge of the protruding portion 16 of the suction hole sealing metal material to the outer peripheral edge of the suction hole 4 (for example, the concept shown in FIG. The presence or absence of the white cloudy portion 18) as shown in the figure is also detected.

[Stress detection device]
Moreover, in order to detect whether the vacuum of the gap | interval part V is maintained, it investigates with the stress detection apparatus 27 shown in FIG.
The stress detection device 27 places the first polarizing plate 28 on the irradiation panel device 23, places the glass panel P for detection on the first polarizing plate 28, and places the first polarizing plate 28 on the glass panel P. 2) The polarizing plate 29 is placed, and the first polarizing plate 28 and the second polarizing plate 29 are disposed so as to be perpendicular to each other.
That is, 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 vacuum or substantially vacuum, it is pressed by atmospheric pressure and only the vicinity of the spacer 2 is polarized to Through and it is determined that there is no leak. On the other hand, if the gap V is at atmospheric pressure, no polarization occurs in the vicinity of the spacer 2, so that the vicinity of the spacer 2 does not transmit light similarly to the other portions, 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 external force such as wind pressure or pressure at the time of wiping and cleaning, temperature difference between the front and back of the glass plate 1A due to solar radiation, temperature difference inside and outside the room, etc. By the warping phenomenon, the contact portion 33 of the protruding portion 16 of the suction hole sealing metal material with respect to the glass plate 1A is peeled off. As a result, there is a possibility that leakage to the gap V may occur and the degree of pressure reduction may decrease, so it is necessary to measure the adhesion of the contact portion 33, and the following repeated bending test (warpage durability test) Do.
As shown in FIGS. 9A, 9B, and 9C, the width 200 mm, the length 350 mm, and the sealing portion of the suction hole 4 where the peripheral portion V1 and the suction hole 4 are sealed with solder (metal material 15 for suction hole sealing) The glass panel P, which is 50 mm to 50 mm, is supported by the hard rubber block 30 with a span of 267 mm 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, and a test is performed so that bending stress acts on the glass, and a stress inspection device is used to leak 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 (4000 days (for 10 years or more as 1 time / day)). These tests result in the amount of depression of the central portion corresponding to (temperature difference 40 ° C., radius of curvature 24444 mm, deformation 0.36) as a change in the environment.

[Acid resistance test]
The glass panel is immersed in H ₂ SO ₄ solution (5%) for 48 hours in order to measure the resistance to corrosion of the metal caused by the contact with the acidic cleaning agent and the acidic solution at the protruding portion 16 of the metal material for suction hole sealing. After that, a stress detection device is used to detect the presence or absence of vacuum leak in the gap after the test.

[Alkali resistance test]
After immersing the glass panel P in an NaOH solution (1%) for 48 hours, a stress detection device is used to detect the presence or absence of vacuum leak in the gap after the test.

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

From the results in Table 1, in the contact portion 33, when the ratio of the white overcast portion is 0.1% to 50%, there is no leak from the suction hole 4 in the repeated test, and it can be commonly used as a building window glass Showing a state, 0.1% or more and 30% or less, and a white clouding portion extending from the outer peripheral edge of the protruding portion 16 of the suction hole sealing metal material to the outer peripheral edge of the suction hole 4 It is possible to determine that there is acid resistance if the condition of not forming. 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 suction hole sealing metal material to the outer peripheral edge portion of the suction hole 4 If the condition that no part is formed is satisfied, it can be determined that there is alkali resistance.

[Experimental Example 2]
In the measurement of the adhesion of the contact portion 33, when the suction hole sealing metal material 15 protrudes around the suction hole 4 on the surface of the gap portion side of one glass plate 1A, the adhesion of the contact portion 33 is made more In order to measure accurately, it is necessary to disassemble the glass panel P which consists of a pair of

glass plate

1A, 1B into separate glass plate 1A and glass plate 1B. Then, only the glass plate 1A in which the suction holes 4 are present is placed on the irradiation panel device 23 with the surface on the side of the gap facing up, and is measured by the contact surface measuring device 26.
However, after the decomposition of the glass panel P consisting of the glass plate 1A and the glass plate 1B12, the metal material for suction hole sealing 15 protruding from the suction hole 4 on the surface on the gap side of the glass plate 1A If it remains outside the suction holes 4 on the surface on the gap side of the glass plate 1A, the suction hole sealing metal material 15 is removed by polishing, and the contact surface measuring device 26 promptly photographs after the polishing process ( The shooting conditions are the same as those of the above-mentioned experimental example 1). When a film is formed on the surface of the glass plate 1A on the side of the gap, the film is removed by polishing, and the film is immediately photographed by the contact surface measuring device 26 after the polishing process.

[White cloudy 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 portion into steps of 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 the contact portion The light reflected by the contact portion 33 is not received by the camera 25 installed immediately above 33. On the other hand, when foreign matter or the like is present at the contact portion 33, part of the diffuse reflection when light strikes the foreign matter enters the light receiving portion of the camera 25, so that the presence of the foreign matter is reflected in white. The portion 33 can sense the percentage of foreign matter present.
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 the reflection with 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 evaluated in the state of multilayer, in the state of multilayer, in the condition where the film is not attached to the glass surface, the threshold value of the cloudiness is 60 to 245. However, when the film is attached to the glass surface, the amount of light reaching the contact portion 33 may change due to the reflection on the film, and the threshold value of the overcast may be changed.
Therefore, in order to evaluate the white haze rate, the double glazing is disassembled into a single plate, and the range of contrast recognized as white cloudy on a single plate according to the amount of light reaching the contact portion 33 is as follows: Set in the procedure.
The threshold value of contrast on a single plate was adjusted to be the same as the white haze rate analyzed in the double-layer glass, and the threshold value of contrast was set to be the same as the white haze rate obtained in the double-layer glass .
Since the solder in the suction hole 4 part is broken in the suction hole 4 when disassembling from a double-layered glass into a single plate, the area of the suction hole 4 is subtracted from that in the contact portion 33 because irregular reflection occurs in that part. The white haze rate was calculated. In addition, when the solder of the suction hole 4 was protruded, cerico polishing was performed so as to be flush with the glass surface. Also in this case, since the suction hole 4 portion becomes cloudy, the white clouding rate of the contact portion 33 is 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 haze rate evaluated for the double layer glass can be obtained. When a film is formed on the glass surface on the photographing surface side, evaluation is performed after film removal by serico polishing.

By the way, as shown by the enlarged photograph of FIG. 11A and 11B, FIG. 11A shows the state of 10% or less of the ratio of the white cloudy part. On the other hand, FIG. 11B shows a state in which the ratio of the white cloudy part is more than 50%.
Further, the lower limit value of the ratio in the area ratio of the white cloudy portion includes a finite value that can be measured.

The present invention can be used as a glass panel with high thermal insulation performance. For example, use as a heat insulating glass panel that requires long-term durability, for construction, for vehicles (window glass of cars, railway cars, ships etc.), or for doors and walls of various devices such as refrigerators and heat retention devices. Can.

[Another embodiment]
1. The suction hole 4 and the metal material 15 for suction hole sealing which extends to cover around the suction hole, the metal material filled in the suction hole 4 and the metal material of the portion reaching the periphery of the suction hole It may be the same composition or a different composition.

[Metal sealing device for suction hole]
Hereinafter, sealing of the suction holes will be described based on FIGS. 12 to 19.
In addition, the code | symbol and the name of each part, etc. may overlap with the code | symbol and name which were used for description of the above-mentioned embodiment, or may use different part name.

In the following embodiment, the spacer 2 is disposed between the pair of

glass plates

1A and 1B to form the gap V, and the peripheral portions of the two

glass plates

1A and 1B are joined with the peripheral sealing metal material 3 And the suction hole 4 for sealing the gap V airtightly and sucking the air in the gap V is provided in the front and the back of one of the

glass plates

1A and 1B. In a certain glass panel, a suction hole sealing device 50 for the glass panel P which supplies the molten suction hole sealing metal material 15 to the suction hole 4 to seal 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 atmosphere side glass surface around the suction hole 4 and the suction hole 4 to seal the suction hole 4 In detail, the glass panel P sucks the air in the gap from the suction hole 4 and Those referred to as so-called vacuum glass sealing by 引孔 4 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 the metal material for suction hole sealing placed in the vicinity of the suction hole to make it molten. Using a device for squeezing a metal material heated to a molten state by the device and having a shape substantially retained by surface tension, such that the molten metal material flows into the suction holes by the cover material on which the weight is placed on the upper surface Have been proposed (see, for example, Patent Document 1).
[Prior art document]

[Patent Document]
[Patent Document 1] Japanese Patent Application Laid-Open No. 2002-137940
[Summary of the Invention]
[Problems to be solved by the invention]

In the above-described conventional suction hole sealing device and suction hole sealing method, a metal oxide which is in a molten state by heating is often formed with a coating of metal oxide, as shown in FIG. As shown in FIG. 19C, when squeezed by a squeeze device 160 ′ (FIG. 19A → FIG. 19B), the metal oxide film 150 ′ is broken into disordered size and shape, and a molten liquid metal for suction hole sealing 15 As a result, the air flows into the atmosphere side of the glass plate and the contact portion with the glass plate (FIG. 19C), and there is a problem that a portion with weak adhesion to the glass plate 1′A around the suction hole 4 ′ is generated.

The present embodiment will be described below based on the drawings. In the drawings, the parts denoted by the same reference numerals as the conventional example indicate the same or corresponding parts.

The glass panel P which concerns on this embodiment arrange | positions the spacer 2 between a pair of

glass plate

1A, 1B, as shown in FIG. 1, forms the clearance part V, and peripheral part V1 of both

glass plate

1A, 1B. Are sealed with a low melting point peripheral sealing metal material (solder) 3 to seal the gap V airtightly (peripheral sealing step (step S35)), and suction holes 4 for sucking air in the gap V Are provided in the glass plate 1A of the pair of

glass plates

1A and 1B so that the air in the space in the space V is drawn from the suction holes 4 to vacuum or cut the space V. In a state of reduced pressure close to vacuum, the suction holes 4 are sealed with a suction hole sealing metal material 15 (suction hole sealing step) so as to be called a vacuum panel.

In addition, before reducing the pressure of the air in the gap V in the vacuum sealing process, an ozone replacement process 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 portion V of the glass panel P is evacuated by a rotary pump (not shown). After the exhaust is completed, ozone is allowed to flow into the gap V, and then the rotary pump is connected again to evacuate the gap V.

About the suction hole sealing device 50 which seals the suction hole 4 with the metal material 15 for suction hole sealing after suctioning air from the suction hole 4 in the glass panel P and removing it to the outside, see FIG. It is configured as shown in FIG.

The suction hole sealing device 50 of the glass panel P is heated and melted in the heating portion 60 heating the solid state suction hole sealing metal material 15 to the melting point thereof and the heating portion 60, and the corners are rounded due to surface tension Suction pin-shaped pointed member 70 which can be pierced into the surface of the suction hole sealing metal material 15 and molten metal flowing out from the piercing hole of the surface of the suction hole sealing metal material 15 formed by the pointed member 70 And a molten metal guiding portion 80 leading to the hole 4.

The heating unit 60 is provided with a funnel-type metal receptacle 90 capable of receiving the suction hole sealing metal material 15 (A heating wire is wound around the outer periphery of the receptacle 90 to be freely heated) . Further, the supply port 100 for guiding the molten metal to the suction hole 4 is provided in the lower part of the receiving tool 90 and is formed in the molten metal guiding portion 80. Further, in the suction hole sealing device 50, the pointed member 70 is disposed above the receiving tool 90 via the compression spring 110, and the pin tip of the pointed member 70 is pushed downward to seal the lower melted suction hole. There is provided an operation mechanism 120 which makes the stop metal material 15 freely pierced up and down.

The supply port 100 uses a cylindrical tube of alumina.
That is, the cylindrical tube made of ceramics such as alumina has a linear expansion coefficient difference with the solder (the suction hole sealing metal material 15) of 6 or more (desirably 17 or more) as shown in Table 2 below. Since the shrinkage factor at the time is smaller than that of the solder, the adhesion between the solder and the cylindrical tube is poor, so the solder and the supply port 100 do not stick.

Furthermore, the suction hole sealing device 50 has a cup 130 which can be closely attached to the glass plate 1A so as to surround the suction hole 4. Inside the cup 130, a heating unit 60, a receiver 90, and , And the molten metal guiding portion 80 is formed to be able to be accommodated. Further, the cup 130 is provided with an intake portion capable of depressurizing 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 in an airtight state inside the cup 130. It 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 lump having substantially rounded corners 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 like, for example, a thin egg of an egg, a hole is formed in the punctured portion of the oxide film 150 by piercing the surface with the pointed member 70. The molten metal mainly flows out from the piercing portion (see FIGS. 14 and 16). The molten metal that has flowed out is guided to the suction holes 4 by the molten metal guiding portion 80, so that it is easy to prevent metal oxides from being mixed in the suction holes 4 (see FIG. 15).
Accordingly, the metal material 15 for sealing the suction hole adheres to the glass in the state where the metal oxide is not mixed in the contact portion 33 with the suction hole 4 and the surrounding glass surface, and the airtightness of the gap portion V is secured. it can.

[Another embodiment]
Other embodiments will be described below.
In the following other embodiments, the same members as those in the above embodiment are denoted by the same reference numerals.
<1> To pierce the suction hole sealing metal material 15 of the suction hole 4 with the pointed member 70 in a molten state, in the embodiment, as shown in FIGS. I pierced to penetrate. Instead of this, as shown in FIGS. 18A to 18B, the lower surface of the molten metal material is pierced obliquely from below, or as shown in FIGS. 17A to 17B, the side of the molten metal material is pierced to seal the suction hole. Even if the surface of the stopping metal material 15 is covered with the oxide film 150, a molten metal material having high purity may be poured into the suction holes 4.
In addition, since FIG. 17, FIG. 18 is explanatory drawing, the horizontal line showing the step part on the flow path of the metal material 15 for suction hole sealing is abbreviate | omitted.

As mentioned above, although the reference numerals are given to make the contrast with the drawings more convenient, the present invention is not limited to the configuration of the attached drawings by the description. Moreover, of course in the range which does not deviate from the summary of this invention, it can implement in a various aspect.

In the above embodiment, a pair of opposing glass plates, a gap formed by arranging a spacer between the pair of glass plates, and a peripheral portion of the pair of glass plates are joined to make the gap airtight. A glass panel comprising: a peripheral sealing metal material to be sealed; and one glass plate of the pair of glass plates has a suction hole which penetrates the front and back in the glass plate and sucks air in the gap portion A suction hole sealing device 50 for a glass panel that supplies the molten suction hole sealing metal material 15 to the suction hole 4 and seals the suction hole 4, the metal material for the suction hole sealing, 15. A heating unit 60 for heating the material 15 to its melting point, a pointed member 70 which can pierce the surface of the suction hole sealing metal material 15 in the heating unit 60, and the metal material 15 for sealing the suction hole by the pointed member. Stab The molten metal flowing out from parts and a molten metal induction unit 80 to divert to the suction hole 4. As an effect of the suction hole sealing device 50, the metal material heated and melted by the heating unit 60 becomes a liquid lump having substantially rounded corners by surface tension (see FIG. 12), and, for example, egg Even if the oxide film 150 is formed like a thin skin, by piercing the surface with the pointed member 70, a hole is formed in the pierced portion of the oxide film 150 (see FIG. 13), and the pierced portion mainly melts Since metal flows out (see FIG. 14 and FIG. 16) and the molten metal is guided to the suction hole 4 by the molten metal guiding portion 80, it becomes easy to prevent metal oxide from being mixed in the suction hole 4 (FIG. 15). reference).
Accordingly, 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 with the atmosphere side surface of the glass plate in a state where metal oxide is not mixed Airtightness can be secured.

Further, the suction hole sealing device 50 described above has a funnel-type receptacle 90 for receiving the metal material 15 for suction hole sealing, and the heating unit 60 has a supply port for guiding the molten metal to the suction hole 4. 100 is provided in the lower part of the receptacle 90 and is formed in the molten metal guiding part 80, and the pointed member 70 is disposed above the receptacle 90 and the lower metal material is formed by the pointed member 70. It has the operation mechanism 120 which makes the upper and lower piercing operation possible. As an effect of the suction hole sealing device 50, by placing the suction hole sealing metal material 15 on the holder 90 and heating it, the metal material on the funnel-type holder 90 can be cut off by surface tension. In the state of good fluidity, the molten metal flows into the suction hole 4 from the supply port 100 provided in the lower part of the holder 90 and the suction hole is formed. 4 is sealed.
However, even if the oxide film 150 is formed on the surface of the molten metal and the flowability is lowered, the sharpening member 70 is melted by the operation mechanism 120 into a metal material which is in a liquid mass. By piercing operation so as to penetrate downward, a piercing hole is formed on the lower side, and mainly the molten metal is supplied downward to the suction hole 4 through the feeding port 100 without winding the metal oxide film 150 from the piercing hole. Ru.
Therefore, the suction hole 4 can be hermetically sealed with a metal material by the suction hole sealing device 50 having a simple structure.

Furthermore, 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 closely attached to the glass plate so as to surround the suction hole 4. The heating unit 60, the receiving unit 90, and the molten metal induction unit 80 can be accommodated inside the cup 130, and the inner space of the cup 130 is depressurized. A possible intake is provided on 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 to make the cup 130 in close contact with the glass plate so as to surround the suction hole 4 formed in the glass plate so that the gap V can be formed by the suction portion provided in the cup 130. The pressure can be reduced. Moreover, the heating hole 60 in the cup heats and melts the suction hole sealing metal material 15 placed on the holder 90 in advance, and the operation mechanism 120 is operated from the outside of the cup 130 to make the metal material on the holder 90 The molten metal can be mainly supplied to the lower suction hole 4 by piercing the pointed member 70 to seal the suction hole 4.
Therefore, the pressure reduction of the gap V and the sealing of the suction hole 4 can be performed by a compact device.

A pair of opposing glass plates, a gap portion V formed by arranging the 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 bonded to each other A suction hole for suctioning air in the gap V is penetrated to the front and the back of one of the pair of

glass plates

1A and 1B, which is provided with a peripheral sealing metal material for hermetically sealing V. In the glass panel P provided in the first embodiment, the molten suction hole sealing metal material 15 is supplied to the suction hole 4 to seal the suction hole 4, and the method for sealing the suction hole of the glass panel is solid. The suction hole sealing metal material 15 is heated to its melting point, and the surface of the suction hole sealing metal material 15 is pierced with a sharp member 70, and the suction hole sealing metal material 15 by the sharp member 70 Molten metal material from the piercing section It drained sealing the suction holes 4 is supplied to the suction hole 4. The effect of the suction hole sealing method of this glass panel is that the metal material heated and melted to the melting point becomes a liquid lump having substantially sharp corners due to surface tension, and an oxide film is formed on its surface, for example, as egg skin. Even if 150 is formed, the surface is pierced by the pointed member 70 to form a hole in the pierced portion of the oxide film 150, and the molten metal mainly flows out from the pierced portion, and the metal oxide 150 is drawn through the suction hole 4 The molten metal can be supplied to the atmosphere-side glass surface around the suction holes 4 without being mixed into the air.
Therefore, the suction hole sealing metal material 15 adheres to the contact portion 33 on the atmosphere-side glass surface around the suction hole 4 in a state where the metal oxide 150 is not mixed with the suction hole 4 and the glass surface around it. The airtightness of the gap V can be secured.

1A, 1B: Glass plate, 2: Spacer (pillar), 3: Metal material for peripheral sealing (solder) 4: 4: Suction hole, 4e: Edge, 5: Metal introduction device, 6: Plate, 6a: High portion , 6b: lower part, 7: feed tower, 8: introduction plate, 8A: bent part, 9: ridge, 10: heat transfer heater, 11: introduction path, 12: rail member, 13: moving mechanism, 14: open Tip portion, 15: suction hole sealing metal material (solder), 16: protruding portion (projection portion) of suction hole sealing metal material, 33: contact portion, V: gap portion, V1: peripheral portion, P: Glass panel, Dw: Projection diameter, Dg: Projection thickness, Tg: Glass plate thickness, Pd: Spacer pitch (interval), Rw: Width, Sw: Suction hole diameter

Claims

A pair of opposing glass plates,
A gap formed by arranging a spacer between the pair of glass plates;
A peripheral sealing metal material which joins the peripheral portions of the pair of glass plates along the entire circumference thereof to hermetically seal the gap portion;
One of the glass plates in the pair is a suction hole which penetrates the front and back of the glass plate and sucks the air in the gap, and the gap is decompressed through the suction hole. A glass panel having a suction hole sealing metal material for sealing the suction holes by reaching and covering the suction holes and the periphery of the suction holes.
In the protruding portion of the suction hole sealing metal material formed around the suction hole on the atmosphere side surface of the one glass plate, the other contact portion with the atmosphere side surface of the one glass plate is A glass panel in which the area of the white cloudy part which light is irregularly reflected and turns white when viewed from the glass plate side is 50% or less.
The glass panel according to claim 1, wherein the ratio of the white clouding portion is further set to 30% or less, and the white clouding portion is the outer peripheral edge portion of the protruding portion of the suction hole sealing metal material. A glass panel that does not form a continuous portion leading to the outer peripheral edge of the suction hole.
The glass panel according to claim 1 or 2, wherein the ratio of the white cloudy portion is set to 10% or less, and the white cloudy portion is an outer peripheral edge portion of the protruding portion of the suction hole sealing metal material. The glass panel which has not formed the continuous arrangement part leading to the outer-periphery edge part of the said 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 a suction hole.
The main component of the suction hole sealing metal material contains any component of Zn, Al, Si and Ti with respect to Sn of 72 to 99.9%, and the content of lead is in 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 value of the ratio in the area ratio of the white cloudy portion includes a finite value that can be measured.