JP2002255593A - Method for manufacturing low pressure double glazing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that, at the time of manufacturing a low pressure double glazing, such energy and much time are needed to seal an evacuation glass tube which is used for evacuating air-gap part. SOLUTION: The evacuation glass tube is sealed by twice sealing processing processes. The 1st sealing process is performed under a low pressure space by fusing a metal of <=600 deg.C melting point provided at the exhausting end of the evacuation glass tube, thereafter the 2nd sealing process is performed under the atmospheric pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to energy saving in the fields of construction such as housing and non-housing, transportation such as automobiles, vehicles, ships, and aircraft, and equipment such as freezers, freezer showcases, and constant temperature and humidity chambers. The present invention relates to a method for producing a low-pressure double glazing having high heat insulating performance applied to an opening that requires the following.

[0002]

2. Description of the Related Art In recent years, in order to create a comfortable and healthy living environment with excellent energy saving, double glazing having heat insulation performance has been used more frequently than ever before and has been rapidly spreading.

[0003] As this double-glazed glass panel, a low-pressure double-glazed glass in which a space formed by facing glass sheets is exhausted has been proposed.

[0004] By setting the pressure in the space of the gap to 0.1 Pa, these low-pressure double glazings can obtain higher heat insulation performance than ordinary double glazing. Conventionally, this gap has been evacuated by the method described with reference to FIGS. In FIG. 5, two sheet glasses 102, 10
3 is sealed with a sealing material 104. Next, sheet glass 10
An exhaust glass tube 106 is inserted into the second exhaust hole 105, and the glass tube 106 and the plate glass 102 are fixed with a sealing material 107.

[0005] Then, the tip of the exhaust glass tube 106 is connected to a vacuum pump 108, and the vacuum pump 108 is evacuated. After the gap between the glass plates 102 and 103 reaches a predetermined pressure (for example, 0.1 Pa). Then, the glass tube is heated and melt-sealed by a heating means such as a burner or an electric heater to obtain a low-pressure double glass 101 as shown in FIG.

However, in order to prevent the glass sheet 102 and the sealing material 107 from being damaged by heating and melting when the exhaust glass tube 106 is melted and sealed by the heating means, the portion where the exhaust glass tube is heated and melted must be formed of a sheet glass. The outer diameter of the exhaust glass tube must be reduced so that it can be melted and sealed with a small heat capacity, or in the former case, the projection of the exhaust glass tube becomes high, so it is used as a window glass for a house. In this case, a problem occurs in which the exhaust glass tube 106 hits a sash frame called a “shoji” when the window is opened and closed. In the latter case, during handling, especially the exhaust glass tube 1
06 is easily damaged when connected to the vacuum pump 108. If the inside diameter of the exhaust glass tube 106 is small, the exhaust resistance increases, and it takes time to exhaust to a predetermined pressure.

Japanese Patent Application Laid-Open No. 10-2161 discloses a method of maximizing the diameter of an exhaust glass tube and suppressing the projection of the glass tube. The exhaust hole 105 is stepped as shown in FIG. A method of melting and sealing an exhaust glass tube with a heat source such as an infrared radiation heater by a light source 110 under a reduced pressure condition has been proposed.

[0008]

The above-described method for melting and sealing the exhaust glass tube melts the exhaust glass tube 106 having a low infrared absorption capacity with an infrared light source, so that large energy is required. There is a problem that it takes time to melt the glass tube.

[0009]

According to the present invention, there is provided a method of manufacturing a low-pressure double-glazed glass sheet comprising the steps of: separating two opposing sheet glasses at a predetermined interval; and forming a dot-like, linear or net-like spacer for maintaining this interval. In the method of manufacturing a low-pressure double-glazed glass in which a gap is formed by sealing the peripheral portion of the panel and arranging the gap and exhausting the gap, the exhaust glass The tube is fixed, the exhaust glass tube is sealed in two sealing steps, the first sealing step is performed in a low-pressure space, and the second sealing step is performed at atmospheric pressure. This is a method for producing a double-glazed glass having features.

Further, the first sealing step is characterized in that a metal having a melting point of 600 ° C. or less is arranged at the end of the exhaust glass tube on the exhaust side, and the metal is sealed by melting the metal. I do.

The position of the exhaust glass tube where the first sealing step is performed is at least 6 mm from the surface of the plate glass to which the exhaust glass tube is fixed, and the exhaust glass tube where the second sealing step is performed Is within 5 mm from the surface of the plate glass to which the exhaust glass tube is fixed.

[0012]

DETAILED DESCRIPTION OF THE INVENTION Two opposing glass sheets include clear float glass sheet, heat ray absorbing glass sheet, heat ray reflecting glass sheet, high-performance heat ray reflecting glass sheet, low radiation sheet glass, and the like.
Wire entering glass, net entering glass, template glass, tempered glass, double strength glass, low reflection glass, high transmission glass,
Various types of plate glass such as frosted glass, tapesti (frost) glass, ceramics printed glass, and laminated glass can be appropriately used in combination.

The thickness of the two glass sheets is usually 1.
A glass having a thickness of 9 mm or more is used. In the case of a tempered glass, especially in the case of a chemically strengthened glass, the thickness is not limited thereto, and a glass having a size of 1.9 mm or less can be used.

It is preferable to use a low radiation plate glass in which a special metal film is formed on at least one of the two plate glasses by a CVD method, a sputtering method, or the like because the heat insulation performance is improved.

At least one sheet glass is provided with a hole having a circular cross section at one or more locations for exhaust, and the hole is used as an exhaust hole. The diameter of the exhaust hole is 1 mmφ or more, preferably 2 mmφ or more.

The two opposing glass sheets may have the same size or different sizes.

Further, it is preferable that the plate glass is one whose edge is chamfered by mechanical polishing, laser or the like in order to improve safety in handling and strength of the edge portion.

As shown in FIG. 4, the exhaust hole 4 is desirably a truncated cone in which the diameter d3 of the exhaust hole on the low pressure space side is smaller than the diameter d1 of the outer exhaust hole. Also, the diameters d1, d
3 is d1>d2> d with respect to the outer diameter d2 of the exhaust glass tube.
It is preferably 3.

The exhaust glass tube may be made of soda-lime glass, lead glass, borosilicate glass, or the like. The shape is not particularly limited, but is preferably cylindrical. Use an exhaust glass tube with an inner diameter of 0.5 mmφ to 4 mmφ and an outer diameter of 1 mmφ to 4 mmφ, preferably with an inner diameter of 1.5 mmφ to
An exhaust glass tube having a diameter of 2 mm and an outer diameter of 2 mm to 2.5 mm is used. The length of the exhaust glass tube is 6 mm to 3 mm.
0 mm, preferably 10 mm to 20 mm.

An exhaust glass tube is fixed to the exhaust hole with a sealing material. Although this sealing material is not particularly limited, it is preferable to use a low-melting glass. Low melting glass is
A ring-shaped powder formed by pressing, baking, or the like, or a powder adjusted to a paste is used. When this sealing material fits into the gap between the exhaust hole and the exhaust glass tube, the appearance is improved, and the sealing material is less affected by heat when the exhaust glass tube is melted and sealed. It is preferred.

The material for the point material, wire material or mesh material spacer for maintaining the interval between the sheet glasses is not particularly limited as long as it has a lower hardness than glass and has an appropriate compressive strength. , Steel, ceramics or plastics are preferred. For metals, iron, copper, aluminum, tungsten, nickel, chromium, titanium, etc. For alloys, for steel, carbon steel, chrome steel, nickel steel, stainless steel, nickel chrome steel, manganese steel, chromium manganese steel, chromium molybdenum steel, silicon steel , Brass, solder, nichrome, duralumin and the like are used.

The point material spacers are in the form of a sphere, a column, an abacus ball, a bead, or the like, and are arranged, for example, in a lattice.

The wire spacer may have a cross section of a circle, a semicircle, a square, or the like, and may be linear or curved.

The spacing between the dot-like, linear or mesh-like spacers is 100 mm or less, preferably 75 mm or less, and may be regular or irregular as long as the spacing is within the range.

The distance between the two glass sheets facing each other is 0.1 mm.
05 mm or more, 2.0 mm or less, 0.1 mm or more,
1.0 mm or less is preferable.

The sealing material used for the peripheral portion is preferably a low-melting glass. Examples of the low-melting glass include lead silicate glass, lead borosilicate glass, and phosphate glass containing no lead. A paste in which a glass powder alone or a mixture of a glass powder and a ceramic powder is dispersed in a vehicle formed of a single component such as amyl acetate, α-terpineol, butyl carbitol acetate, glycerin, cellulose, or a mixture can be used.

A low melting glass paste is applied around one of the glasses. After the paste is applied, the paste is heated at a temperature equal to or higher than the softening temperature of the low-melting glass to volatilize the vehicle and fuse the low-melting glass to one of the glass sheets.

A spacer for maintaining a space between the two sheets is provided on the plate glass having the low melting point glass fused to the periphery described above.
Another sheet glass is stacked and heated, and the two sheet glasses are integrated with the low melting glass fused to the periphery.

The dot-shaped spacer is disposed by using a suction cup having a large number of holes for accommodating the spacer or a tubular suction forceps.

The first sealing step is performed on the two opposing plate glasses integrated by the method shown in FIG.

The exhaust chamber 11 in which the heater 10 is provided is brought into close contact with the glass sheet 2 via the O-ring 9. The heater 10 preferably has a hollow structure such as a cylindrical shape. The heater 10 has an exhaust glass tube 7
Is located so that the end of the heater 10 is located at a hollow portion of the heater 10. It is preferable to arrange a metal 17 having a melting point of 600 ° C. or less, preferably 300 ° C. or less, at the tip of the exhaust glass tube.

The metal 17 includes Sn, In, Pb, Pb-
It is desirable to use metals such as Sn-based, In-Sn-based, and Zn-Sn-based. Also, instead of metal 17, 600 ° C.
Low melting glass having the following glass softening temperature may be used.

The heater 10 is 5 mm from the sheet glass 2.
Above, preferably 10 mm apart. This distance is to eliminate the influence of the heating of the heater 10 on the low melting point glass 5 fixing the exhaust glass tube 7 to the plate glass 2.

The exhaust path 12 is connected to an exhaust pump (not shown), and exhausts the gap 18 to a predetermined pressure.
In the exhaust, the atmosphere temperature at which the exhaust is performed is 70 to 250 ° C.
Preferably, when the temperature is set at 100 to 150 ° C., the exhaust can be efficiently performed.

After the gap 18 is evacuated to a predetermined pressure such as 1 Pa, the metal 7 is heated by the heater 10 to melt the metal 17 and seal the exhaust glass tube 7.

After sealing the exhaust glass tube 7, the exhaust chamber 11 is removed from the low pressure double glazing.

In the low-pressure double-glazed glass produced only in the first sealing step, the second sealing step is performed because the sealed part of the exhaust glass tube by the metal part cannot hold pressure for a long time.

The second sealing step is performed by the method shown in FIG. The ring-shaped heater 14 is arranged in the exhaust glass tube 7. At this time, it is preferable to dispose a ceramic heat insulating material 13 between the ring-shaped heater and the plate glass 2.
The ring-shaped heater 14 is preferably arranged at a distance of 5 mm or less from the outer surface of the glass sheet 2. The exhaust glass tube 7 is heated and softened by the ring-shaped heater 14. When the exhaust glass tube 7 is melted, the ring-shaped heater 1
The portion of the exhaust glass tube 7 farther from the sheet glass 2 than the heating point 4 is pulled in a direction perpendicular to the sheet glass 2 to cut the exhaust glass tube 7 at the heating point and melt-sealed near the surface of the sheet glass 2. Stop. Since the melting and sealing of the exhaust glass tube 7 is performed under the atmospheric pressure, the molten portion of the exhaust glass tube 7 gathers inward of the tube, and the low melting point glass 5 fixing the plate glass 2 and the exhaust glass tube 7. In addition, the melt sealing can be performed in a short time without being affected by the heating of the ring-shaped heater 14.

[0039]

EXAMPLES The present invention will be described more specifically with reference to the following examples, but the present invention is not limited to the following examples.

Example 1 FIG. 3 is a cross-sectional view of a low pressure double glazing produced in this example. Both the sheet glass 2 and the sheet glass 3 have a thickness of 3.
A square having a size of 0 mm and a size of 1040 mm × 1040 mm was used. Further, a glass plate 3 having a low emissivity film with a vertical emissivity of 0.1 was used with the low emissivity film facing the closed space. The plate glass 2 was provided with an exhaust hole 4 at one corner at a position 6 cm from each side. The diameters d1 and d3 of the exhaust hole and the outer diameter d2 of the exhaust glass tube were set to d1>d2> d3.

FIG. 4 shows a sectional shape near the exhaust hole 4. The exhaust hole 4 was formed so that d1 was 3 mm and d3 was 2 mm.

A low-melting glass paste of 5 mm width and 0.4 mm thickness is applied to the periphery of the plate glass 3 at 480 ° C.
Then, the sealing portion 5 was formed. Of low melting point glass paste, PbO (85 _{wt%), B 2 O 3 (} 13 _{wt%), Al 2 O 3 (} 1 wt%), and lead glass powder having a composition consisting of SiO ₂ (1 wt%), PbTiO ₃ powder is mixed at a weight ratio of 70:30, and a vehicle composed of butyl carbitol acetate, α-terpineol and cellulose is added at 13% by weight.

Next, on the surface of the plate glass 2, cylindrical spacers 6 made of SUS430 having a diameter of 0.5 mm and a height of 0.2 mm are arranged in a grid pattern at intervals of 20 mm. The glass plate 3 formed with the above is superimposed, and then turned upside down, an exhaust glass tube 7 made of soda-lime glass having an inner diameter of 2 mmφ, an outer diameter (d2) of 2.5 mmφ and a length of 15 mm is inserted into the exhaust hole 4 of the glass plate 2. The gap between the inner surface of the exhaust hole 4 and the outer surface of the exhaust glass tube 7 was filled with the paste of the low melting point glass as a sealing material 5 '.

The laminated sheet glass 2 and sheet glass 3
Heat treatment was performed at 30 ° C., and the plate glass 2 and the plate glass 3 were firmly fixed by the sealing portion 5, and the exhaust glass tube 7 was also fixed to the exhaust hole 4 by the sealing material 5 ′.

After the heat treatment, the sheet glass 2 and the sheet glass 3 are cooled down to 130 ° C., and while maintaining the temperature of 130 ° C., as shown in FIG. 1, an exhaust chamber 11 in which a heater 10 is provided is provided. Was adhered to the plate glass 2 via the O-ring 9. As the heater 10, a cylindrical ceramic heater was used. Pb at the end of the exhaust glass tube 7
After disposing the -Sn-based metal 17 and exhausting the gas through the exhaust path 12 until the pressure in the gap 18 became 1 Pa, the metal 17 was melted by the heater 10 and the exhaust glass tube was sealed.

After sealing, the exhaust chamber 11 is
, And the second sealing was performed by the method shown in FIG.

A 2.5 mm thick ceramic fiber ring heat insulator 13 and a 1 mm thick ring heater 14
Then, the exhaust glass tube 7 is heated by the ring-shaped heater 14 by surrounding the exhaust glass tube 7, and almost simultaneously with the start of melting of the exhaust glass tube 7, the exhaust glass tube 7 is pulled in a direction perpendicular to the sheet glass 2, The final sealing of the glass tube 7 was performed, and the protrusion of the exhaust glass tube was set to 4 mm.

The low pressure double glazing 1 thus obtained
Has an initial dew point of -70 ° C or less and a heat transmission coefficient of 0.6 W / m ² ° C
It became.

[0049]

The method for producing a low-pressure double glazing of the present invention is as follows.
Since the influence of heat during the heat sealing of the exhaust glass tube with the sealing material for sealing the exhaust glass tube and the plate glass can be reduced, not only the yield is improved, but also the protrusion of the exhaust glass tube can be reduced, and the opening and closing of the window can be performed. It has made it possible to provide a low-pressure double glazing which does not hinder the operation.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a method of a first sealing step.

FIG. 2 is a cross-sectional view illustrating a method of a second sealing step.

FIG. 3 is a cross-sectional view of the low pressure double glazing of Example 1.

FIG. 4 is a cross-sectional view of the vicinity of an exhaust hole of the low-pressure double glazing of Example 1.

FIG. 5 is a cross-sectional view illustrating a conventional manufacturing method.

FIG. 6 is a sectional view of a conventional exhaust hole.

FIG. 7 is a cross-sectional view illustrating a conventional manufacturing method.

FIG. 8 is a cross-sectional view of a low-pressure double glazing produced by a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Low-pressure double glazing 2 Sheet glass 3 Sheet glass (with low radiation film) 4 Exhaust hole 5 Sealing material 6 Spacer 7 Exhaust glass tube 8 Exhaust part 9 O-ring 10 Heater 11 Exhaust chamber 12 Exhaust path 13 Ring heat insulating material 14 Ring heater 15 Power supply 16 Power supply line 17 Metal 18 Gap portion 101 Low-pressure double-glazed glass of comparative example 102 Sheet glass 103 Sheet glass 104 Sealing material 105 Exhaust hole 106 Exhaust glass tube 107 Sealing material 108 Exhaust pump 109 Stepped exhaust hole 110 Red Heat source by external light 111 Infrared light shielding plate

Claims (3)

[Claims] 1. A pair of opposing plate glasses are spaced at a predetermined interval, and a dot-like, linear or net-like spacer for maintaining this interval is provided, and a peripheral portion of the panel is sealed to form a gap. In the method for producing a low-pressure double-glazed glass in which a portion is formed and a gap portion is evacuated and depressurized, an exhaust glass tube is fixed to an exhaust hole provided in a sheet glass, and the exhaust glass tube is sealed twice. Wherein the first sealing step is performed in a low-pressure space, and the second sealing step is performed under atmospheric pressure. 2. The sealing process according to claim 1, wherein the first sealing step is performed by melting a metal having a melting point of 600 ° C. or less, which is disposed at an exhaust side end of the exhaust glass tube. 3. The method for producing a low-pressure double-glazed glass according to item 1. 3. The position of the exhaust glass tube where the first sealing step is performed is at least 6 mm from the surface of the plate glass to which the exhaust glass tube is fixed, and the exhaust glass tube where the second sealing step is performed. 3. The method for producing a low-pressure double-glazed glass according to claim 1, wherein the position is within 5 mm from the surface of the plate glass to which the exhaust glass tube is fixed.