JP4567894B2 - Glass panel - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In the present invention, a plurality of spacing spacers are interposed between a pair of plate glasses, and the gap between the outer peripheral portions of the two plate glasses is sealed with an outer peripheral sealing portion to form a gap portion between the two plate glasses. It is related with the glass panel currently hold | maintained in the pressure reduction state.
[0002]
[Prior art]
Atmospheric pressure acts from the outer surface of both glass plates based on the reduced pressure of the gap, but in order to counter the compressive stress due to the atmospheric pressure, this type of glass panel has conventionally been a hard material with high compressive strength. The spacer which consists of was used as a space | gap part formation material.
[0003]
[Problems to be solved by the invention]
According to the conventional glass panel described above, since the hard material having high compressive strength is used for the spacer, the space between the gaps is maintained against the compressive stress acting in the direction of compressing the spacer due to atmospheric pressure or the like. Although it becomes easy to do, the frictional resistance with plate glass becomes large. Therefore, when the glass panel is bent due to a load applied locally and shockingly such as wind pressure or impact applied from the outside and the spacer and the glass sheet try to cause a sudden relative movement, the frictional resistance between the glass sheet and the spacer causes The shear stress was increased, and breakage damage was likely to occur on the plate glass.
Therefore, in order to prevent breakage damage that occurs in the plate glass, a hard material is used for the spacer main body 2A and the contact portion 2B of the spacer 2 that contacts the plate glass 1 is soft as shown in FIGS. There has been proposed a technique in which a layer N is provided and shear stress associated with relative movement between the spacer 2 and the plate glass 1 is absorbed by plastic deformation of the soft layer N.
However, when the relative movement occurs slowly over the entire surface, the soft layer N can relax and absorb the shear stress acting between the spacer 2 and the glass sheet 1 by following the relative movement. (Refer to FIG. 6 (b)), since the soft layer N cannot follow a sudden relative movement due to an external force applied locally and shockfully, a shear stress acting between the spacer 2 and the glass sheet 1 is applied. There was a problem that relaxation and absorption could not be performed and breakage damage was likely to occur in the glass sheet 1.
Therefore, when trying to increase the followability to the abrupt relative movement, there is a need to use a softer material for the soft layer, but this will reduce the compressive strength this time. The amount of compressive deformation of the soft layer becomes significant, and it becomes difficult to keep the gaps at a predetermined interval against the compressive stress caused by atmospheric pressure or the like.
At this time, depending on the amount of compressive deformation of the soft layer, the outer peripheral portion of the glass plate may be damaged. This is because the outer peripheral portion of both glass plates is sealed with an outer peripheral sealing portion and rigidly joined, but the plate surface portion other than the outer peripheral portion in the plate glass causes deformation toward the gap portion side, thereby causing the outer periphery This is because a tensile stress is generated in the part.
[0004]
Accordingly, an object of the present invention is to solve the above-mentioned problems, to have a high compressive strength, and not only to cause a relative movement slowly across the entire surface, but also to abrupt relative between the spacer and the plate glass due to external force applied locally and impactively. The present invention is to provide a glass panel that relaxes and absorbs shear stress generated by movement and hardly breaks.
[0005]
[Means for Solving the Problems]
〔Constitution〕
The characteristic configuration of the invention of claim 1 is, as illustrated in FIGS. 1 to 4, a large number of spacing spacers 2 are interposed between a pair of plate glasses 1 </ b> A and 1 </ b> B, and between the outer peripheral portions of both plate glasses 1 </ b> A and 1 </ b> B. Is sealed with an outer peripheral sealing portion 4 to form a gap portion V between the two glass plates 1A and 1B, and the gap portion V is kept in a reduced pressure state, and is in contact with the plate glass 1 in the spacer 2 The contact portion 2B is provided with friction reducing means T formed of an inorganic material M having a layered crystal structure .
[0006]
The feature of the invention of claim 2 is that the inorganic material M is formed of an aggregate of fine particles made of at least one of boron nitride, graphite, molybdenum disulfide, and tungsten disulfide.
[0007]
The characteristic configuration of the invention of claim 3 is that, as illustrated in FIG. 5, the thickness h of the friction reducing means T provided in the contact portion 2B is set to 3 μm or more.
[0008]
In addition, as mentioned above, although the code | symbol was written in order to make contrast with drawing convenient, this invention is not limited to the structure of an accompanying drawing by this entry.
[0009]
[Action and effect]
According to the first aspect of the present invention, friction reducing means formed of an inorganic material having a layered crystal structure is provided at the contact portion of the spacer that contacts the plate glass. It is possible to reduce the shear stress that easily occurs.
That is, since the frictional resistance between the spacer and the plate glass due to the relative movement can be reduced by the friction reducing means provided in the contact portion of the spacer, of course, the relative movement between the spacer and the plate glass acting slowly over the entire surface, It is also possible to reduce the shear stress generated by the relative movement caused by the external force applied locally and impactively.
As a result, it became possible to suppress breakage damage due to shear stress that was likely to occur in plate glass.
[0010]
Furthermore, since the friction reducing means is formed of an inorganic material having a layered crystal structure, it can resist compressive stress and exert a lubricating function against relative movement between the spacer and the glass panel. be able to.
In other words, since an inorganic material having a high compressive strength is used for the contact portion, the gap portion can be maintained against the compressive stress acting in the direction of compressing the spacer due to atmospheric pressure or the like, and the spacer and the plate glass With respect to relative movement, the layered crystal structure easily peels to allow relative movement of the layered crystals.
As a result, the space between the gaps can be maintained opposite to the compressive stress, and a lubricating function can be exhibited.
[0011]
According to the second aspect of the present invention, in addition to achieving the function and effect of the first aspect of the invention, the inorganic material is at least one of boron nitride, graphite, molybdenum disulfide, and tungsten disulfide. Since it is formed by an aggregate of fine particles composed of seeds, the reduced pressure state inside the void can be maintained for a long period of time.
In other words, for example, when the friction reducing means is formed of an unstable organic material that is easily gasified, there is a problem that the degree of decompression in the void portion that has been gasified during use and reduced pressure is reduced. However, since the aggregate of fine particles composed of at least one of boron nitride, graphite, molybdenum disulfide, and tungsten disulfide of the present application is stable without being gasified over a long period of time during use, There is no risk of affecting the decompressed state inside the gap.
As a result, the reduced pressure state in the gap can be maintained over a long period of time, so that the soundproofing and heat insulating performance of the glass panel can be maintained over a long period of time.
[0012]
According to the invention of claim 3 , in addition to being able to achieve the function and effect of the invention of claim 1 or 2 , the thickness dimension of the friction reducing means provided at the contact portion is set to 3 μm or more. Thus, the friction reducing function by the friction reducing means can be sufficiently exhibited.
That is, when the thickness dimension of the friction reducing means is 3 μm or more, the friction reducing function is easily exhibited as shown in FIG.
As a result, it became difficult to cause breakage damage to the glass plate.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0014]
FIG. 1 shows a vacuum multilayer glass SF as an embodiment of the glass panel P of the present invention. The vacuum multilayer glass SF has a number of spacers between a pair of plate glasses 1 (an example of a glass panel P). 2 and the space between the outer peripheral portions of the first and second glass plates 1A and 1B is sealed with the outer peripheral sealing portion 4 to form a gap V between the first and second glass plates 1A and 1B. Among the second glass plates, one of the first glass plates 1A is provided with a suction hole 3 for sucking the gas in the gap V, and after sucking the gas A in the gap V from the suction hole 3, the suction hole 3 is sealed. It is formed to stop.
[0015]
Of the pair of plate glasses 1, the first plate glass 1 </ b> A and the second plate glass 1 </ b> B are both made of float plate glass (thickness dimension: 2.65 mm to 3.2 mm). However, the area is slightly smaller than that of the second glass plate 1B, and the outer peripheral edge of the second glass plate 1B is projected from the outer peripheral edge of the first glass plate 1A over the entire circumference. When sealing with the melting point glass 5 (an example of the outer peripheral sealing portion 4), the gap portion V can be formed with good workability by placing the paste-like low melting point glass 5 on the protruding portion. ing.
[0016]
As shown in FIGS. 4 and 5, the spacer 2 is composed of a spacer body 2 </ b> A and a contact portion 2 </ b> B that contacts the plate glass 1.
The spacer body 2A is formed of a material that has compression resistance enough to withstand atmospheric pressure, withstands high-temperature processes such as baking and baking, and does not easily gasify after manufacturing the glass panel P.
Specifically, a metal material or a ceramic material is desirable, and iron, copper, aluminum, tungsten, nickel, chromium, titanium, or an alloy containing these, or elementary steel, chromium steel, nickel steel, stainless steel, nickel chromium steel , Manganese steel, chromium manganese steel, chromium molybdenum steel, silicon steel, brass, solder, nichrome, duralumin, inconel 718, etc., and ceramic materials include corundum, alumina, mullite, magnesia, yttria, aluminum nitride And silicon nitride.
[0017]
The spacer body 2A is formed by a method of forming a predetermined dimension from a plate-like metal material produced by rolling or the like, by means of discharge, sawing, pressurized water, laser, or the like, by punching or by etching. Or a rod-shaped metal material produced by extrusion or the like is cut into a predetermined thickness.
[0018]
As shown in FIG. 4, friction reducing means T made of molybdenum disulfide (an example of the inorganic material M) is formed in the contact portion 2B.
Molybdenum disulfide has a layered crystal structure and not only can be easily peeled and exert a lubricating function, but also is stable without being gasified over a long period of time during use. There is no risk of affecting the decompressed state inside the part V,
Since the pressure-reduced state in the space V can be maintained over a long period, the soundproofing and heat insulating performance of the glass panel P can be maintained over a long period.
[0019]
As shown in FIG. 5, the size of the spacer 2 may be determined in view of the compressive force acting on the spacer 2 and aesthetics, but the diameter is about 0.1 mm to 1.0 mm and the height is about 0.15 mm to 1.0 mm. It is preferable that the thickness dimension h of the friction reducing means T provided in the contact portion 2B is set to 3 μm or more.
In addition to the cylindrical shape, the spacer 2 may have a prismatic shape, a ring shape, a linear shape, a chain shape, or the like. And it is difficult to make the corner | angular part which is easy to produce stress concentration in the contact part with respect to both plate glass 1A, 1B by forming in a column shape, grants the support of a gentle state with respect to the plate glass 1, and makes it difficult to destroy. be able to.
The arrangement interval on the glass surface of each spacer 2 is determined from the tensile stress generated on the surface of the plate glass 1, the compressive stress acting on the spacer 2, etc., but the interval of 10 mm to 40 mm is appropriate in the vertical and horizontal directions along the plate surface direction. It is. At this time, it is desirable that they are arranged at equal intervals in terms of aesthetics, but they may be arranged at random if the stress is within appropriate conditions.
The distance between the gaps V formed between the two glass sheets 1A and 1B is preferably about 0.1 mm to 1.0 mm.
[0020]
The manufacturing method of the vacuum multilayer glass SF will be described with reference to FIGS.
As shown in FIG. 2 (a), with the first glass plate 1A facing upward, the spacer 2 is sandwiched between the two glass plates 1A and 1B, and the paste-like low-melting glass 5 is applied along the outer peripheral edge of the first glass plate 1A. In addition, the low melting point glass 5 is applied over the peripheral surface of the suction hole 3 and the glass tube 9 and heated to about 500 ° C. in the heating furnace 6 to melt the low melting point glass 5. The temperature inside 6 is lowered to about room temperature, and the space between the outer peripheral portions of both glass plates 1A and 1B is sealed with a cured low melting point glass 5 to form a void V, and the peripheral surface of the suction hole 3 and the glass tube A glass panel main body F is formed which is hermetically bonded and fixed with the low melting point glass 5 cured with 9 (see FIG. 2B).
[0021]
As shown in FIG. 3, the glass panel main body F is horizontally supported in the heating furnace 6 so that the first glass plate 1A is on the upper side, and the suction cup 8 of the suction sealing device 7 is placed on the plate surface of the first glass plate 1A. To cover the glass tube 9.
The suction sealing device 7 communicates and connects a flexible pipe 10 that sucks and discharges gas in the gap V to the lateral side of a bottomed cylindrical suction cup 8 that forms a suction port 8a. 8 is provided with an elastic O-ring 11 that seals between the plate surface of the first plate glass 1A, and an electric heater 12 that heats and melts the tip of the glass tube 9 is provided inside the bottom of the suction cup 8. Has been.
[0022]
And the front-end | tip of the suction cup 8 is closely_contact | adhered to the plate | board surface of the 1st glass plate 1A through the O-ring 11, and it heats to about 200 degreeC, for example, activates the inside of the space | gap part V, and opens a space | gap part via the flexible pipe 10. Baking is performed to suck and discharge the gas in V, and the gap V is depressurized to about 1.33 Pa (1.0 × 10 −2 Torr) or less.
Next, after melting the tip of the glass tube 9 by locally heating (about 1000 ° C.) with the electric heater 12, the suction hole 3 is sealed and cooled in this state as shown in FIG. Then, a protective cap 15 covering the molten glass tube 9 is adhered to the plate glass.
[0023]
In the case of the vacuum multi-layer glass SF manufactured as described above, the compressive stress acting in the direction of compressing the spacer 2 due to the atmospheric pressure applied from the outer surfaces of the two glass plates 1A and 1B based on the reduced pressure of the gap portion V was applied. However, the gap V can be maintained against the compressive stress by the cooperation of the spacer body 2A having compression resistance and the contact portion 2B using the inorganic material M having high compressive strength. .
In addition to the relative movement of the spacer 2 and the glass sheet 1 acting slowly over the entire surface, as shown in FIGS. 4 (a) and (b), shear stress is generated due to the relative movement due to the external force applied locally and impactively. However, since the layered crystal structure of molybdenum disulfide provided in the contact portion 2B is peeled off, allowing the relative movement of the layered crystals of each other and exhibiting a lubricating function of reducing frictional resistance, shear stress Can be reduced, and breakage damage of the glass sheet 1 can be suppressed.
[0024]
[Another embodiment]
Other embodiments will be described below.
<1> The example in which the friction reducing means is formed of molybdenum disulfide in the previous embodiment has been described. However, the friction reducing means is not limited to molybdenum disulfide, and at least one of boron nitride, graphite, and tungsten disulfide. It may be formed by an aggregate of fine particles composed of seeds.
Aggregates of fine particles composed of at least one of boron nitride, graphite, and tungsten disulfide have a layered crystal structure and can be easily peeled off to exhibit a lubricating function. Since the inside is stable without being gasified for a long period of time, there is no possibility of affecting the reduced pressure state inside the gap, and the reduced pressure inside the gap can be maintained for a long time.
[0025]
Specifically, in order to provide an aggregate of fine particles made of at least one of molybdenum disulfide, boron nitride, graphite, and tungsten disulfide between a spacer and a plate glass, the material is in a fine particle state (size: 1 μm to After that, it is dispersed in an appropriate solvent and applied to the surface of the spacer or glass plate. As a coating method, general methods such as a spray method, a brush coating method, a roll coater method, a dipping method, a gravure coater method, a knife edge coater method, and a screen printing method can be applied. It is necessary to sufficiently dry and bake so that the solvent residue does not affect the vacuum stability of the glass panel after coating.
[0026]
<2> The friction reducing means is not limited to the inorganic material described in the above embodiment, and the material is stable for a long time during use, and there is no risk of gasifying and affecting the vacuum state inside the gap. A material capable of exhibiting the same function as an organic material, such as a fluorinated ethylene resin, may be used.
Moreover, the thing of the structure which uses what joined the organic material and the inorganic material as a friction reduction means may be used.
[0027]
<3> In the previous embodiment, the example in which the friction reducing means is provided on both surfaces where the spacer contacts the plate glass has been described. However, it is not particularly necessary to provide the friction reducing means on both surfaces, and the friction reducing means may be provided on either one.
[0028]
<4> The glass panel of the present invention can be used for a wide variety of applications while maintaining the gap in a reduced pressure state. For example, for architectural and vehicle use (window glass for automobiles, window glass for railway vehicles, ships) Window glass) / device elements (plasma display surface glass, doors and walls of refrigerators, doors and walls of heat insulation devices), and the like.
[0029]
<5> The plate glass used for the glass panel of the present invention is not limited to the float glass described in the previous embodiment, and the type can be arbitrarily selected, and the surface of the plate glass is optically and thermally. An oxide film, a metal film, or the like may be formed for the purpose of improving characteristics. For example, template glass, ground glass (glass that has been given the function of diffusing light by surface treatment), meshed glass or tempered glass, plate glass that has been provided with functions such as heat ray absorption, ultraviolet absorption, heat ray reflection, and low radiation, and A combination of these may be used. As a specific example of the low emissivity glass, there is a plate glass in which a film mainly composed of tin oxide is formed by a chemical vapor deposition method (CVD method) in the middle of a plate glass forming line. Alternatively, a glass in which a film based on a structure in which a silver layer is centered and sandwiched vertically between dielectric layers by sputtering or the like in a vacuum vessel is also conceivable.
[0030]
<6> The composition of the glass is not limited to the previous embodiment, soda silicate glass (soda lime silica glass), borosilicate glass, aluminosilicate glass (aminosilicate glass), and various crystallizations. Any material such as glass is applicable. Further, the production method of the plate glass is not particularly limited, such as a roll-out method, a downdraw method, a press method, etc. in addition to the float method.
[0031]
<7> The plate glass used for the glass panel of the present invention is not limited to one in which one plate glass and the other plate glass have different lengths or width dimensions, but uses ones formed in the same dimensions. It may be a thing. And how to laminate | stack both plate glass may be piled up in the state which edge parts align.
[0032]
<8> The glass panel of the present invention may be sealed between the outer peripheral portions of the plate glass with a metal solder having a main component such as indium, lead, tin or zinc as a sealing material.
[0033]
【Example】
A cylindrical Inconel spacer with a diameter of 0.5 mm and a height of 0.2 mm is arranged in a lattice pattern at intervals of 20 mm between a pair of 3 mm thick plate glasses cut and formed to a size of 300 × 300 mm square and 290 × 290 mm square. In a glass panel in which the voids are formed and the outer peripheral edges of the two glass plates are sealed with a low-melting glass, and the voids are vacuumed to maintain a reduced pressure state, the molybdenum disulfide fine particles are dispersed. When the liquid suspended in isopropyl alcohol is applied to both surfaces of the spacer by brush coating, the liquid concentration and the number of brush coatings are changed, and the friction reducing means having different layer thicknesses is baked at a processing temperature of 250 ° C. for 1 hour. A 1.04 kg steel ball is dropped from above each test body against a plurality of test bodies formed with a comparative test body provided with no friction reducing means on the spacer. The strength at the time of shooting was examined. Specifically, FIG. 7 shows the experimental results of determining the height of the falling ball when the falling height of the steel ball is gradually increased and the glass breaks. (FIG. 7 (a) shows the experimental data of each specimen, and FIG. 7 (b) shows the experimental data in a graph.)
[0034]
As is apparent from the results of FIG. 7, it was found that the breaking ball height of the test body provided with the friction reducing means was significantly higher than that of the comparative test body not provided with the friction reducing means, and the strength was high. Further, among the test specimens provided with the friction reducing means, the thickness dimension of the friction reducing means provided at the contact portion is clearly shown from the fact that the strength is remarkably increased when the thickness dimension of the friction reducing means is 3 μm. It was found that the one set to 3 μm or more has higher strength.
[Brief description of the drawings]
FIG. 1 is a partially cutaway perspective view showing a glass panel. FIG. 2 is an explanatory view showing a method for forming a glass panel. FIG. 3 is an explanatory view showing a method for depressurizing a gap. FIG. 5 is an enlarged cross-sectional view showing a spacer. FIG. 6 is a diagram for explaining the operation of a spacer in a comparative example. FIG. 7 is a table and graph showing experimental results.
DESCRIPTION OF SYMBOLS 1A 1st glass plate 1B 2nd glass plate 2 Spacer 2B Contact part 4 Outer periphery sealing part V Cavity part T Friction reduction means M Inorganic material

Claims (3)

A plurality of spacing spacers are interposed between a pair of plate glasses, and the outer peripheral portions of the two glass plates are sealed with an outer peripheral sealing portion to form a void portion between the two glass plates, and the void portion is in a reduced pressure state. A held glass panel,
The glass panel which provided the friction reduction means formed with the inorganic material which has a layered crystal structure in the contact part which contacts the said plate glass in the said spacer. The glass panel according to claim 1 , wherein the inorganic material is formed of an aggregate of fine particles made of at least one of boron nitride, graphite, molybdenum disulfide, and tungsten disulfide. The glass panel according to claim 1 or 2 , wherein a thickness dimension of the friction reducing means provided in the contact portion is set to 3 µm or more.

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