JP6425174B2 - Method of manufacturing vacuum glass panel - Google Patents

Description

  A method of manufacturing a vacuum glass panel is disclosed. More specifically, a method of manufacturing a glass panel having a vacuum space between a pair of glass bodies is disclosed.

  Conventionally, a glass panel having a vacuum space between a pair of glass bodies (hereinafter referred to as "vacuum glass panel") is known. Vacuum glass panels are also called double glazings. The vacuum glass panel is excellent in heat insulation since the vacuum space suppresses heat conduction. In the manufacture of a vacuum glass panel, a pair of glass panels are bonded with a gap, and the gas inside is evacuated and sealed to form a vacuum space. Unlike a mere single glass plate, the vacuum glass panel is susceptible to warping and breakage during the manufacturing process because two glass bodies are bonded. In particular, when the two glass bodies are different, warpage or breakage is likely to occur.

  Patent Document 1 discloses a vacuum glass panel. The vacuum glass panel is prevented from being damaged by the thermal expansion coefficients of the pair of glass plates satisfying a predetermined relationship. However, vacuum glass panels are required to further prevent warpage and breakage.

Patent No. 3312159 gazette

  An object of the present disclosure is to provide a method of manufacturing a vacuum glass panel that is resistant to warpage and breakage.

  In the method of manufacturing a vacuum glass panel according to the present disclosure, a step of disposing a glass adhesive containing heat melting glass in a frame shape on at least one of a first glass body containing a net and a second glass body; Placing the first glass body and the second glass body opposite to each other, and heating the glass composite containing the first glass body, the second glass body, and the glass adhesive, Bonding the first glass body and the second glass body with an adhesive, exhausting an internal space surrounded by the first glass body, the second glass body, and the glass adhesive, and Sealing the interior space to form a vacuum space from the interior space. The temperature rising rate in heating in the step of bonding the first glass body and the second glass body is 150 ° C./hour or less.

  According to the present disclosure, a vacuum glass panel in which warpage and breakage are suppressed can be obtained.

FIG. 1 consists of FIG. 1A-FIG. 1C. FIG. 1 shows an example of a vacuum glass panel. FIG. 1A is a plan view of an example of a vacuum glass panel. FIG. 1B is a cross-sectional view of an example of a vacuum glass panel. FIG. 1C is an exploded perspective view of an example of a vacuum glass panel. FIG. 2 consists of FIG. 2A-2D. FIG. 2 shows an example of manufacturing a vacuum glass panel. 2A to 2D are cross-sectional views of a state in the middle of forming a vacuum glass panel. FIG. 3 consists of FIG. 3A and FIG. 3B. FIG. 3 shows an example of manufacturing a vacuum glass panel. 3A and 3B are plan views of a state in the middle of forming a vacuum glass panel. It is a typical graph explaining an example of temperature change in manufacture of a vacuum glass panel. It is a typical graph explaining thermal expansion and thermal contraction of a glass body.

  FIG. 1 shows an example of a vacuum glass panel (vacuum glass panel 1). FIG. 1 consists of FIG. 1A-FIG. 1C. 1A is a plan view, FIG. 1B is a cross-sectional view, and FIG. 1C is an exploded perspective view. 1A to 1C schematically show a vacuum glass panel, and the actual dimensions of each part may be different. In particular, in FIG. 1B, the thickness of the vacuum glass panel is increased for easy understanding.

  The vacuum glass panel 1 is basically transparent. Therefore, members inside the vacuum glass panel 1 (for example, the mesh 11, the frame 30, the spacer 40) can be visually recognized. In FIG. 1A, the visible internal member is drawn. In FIG. 1A, the vacuum glass panel 1 is viewed from the second glass body 20 side.

  The vacuum glass panel 1 includes a first glass body 10, a second glass body 20, and a frame body 30 for bonding the first glass body 10 and the second glass body 20. The vacuum glass panel 1 is provided with a vacuum space 50. The vacuum space 50 is disposed between the first glass body 10 and the second glass body 20. Since the vacuum glass panel 1 includes the vacuum space 50, heat is less likely to be transmitted in the thickness direction of the vacuum glass panel 1. Therefore, the vacuum glass panel 1 is excellent in heat insulation.

  The vacuum glass panel 1 includes a plurality of spacers 40. The plurality of spacers 40 ensure a distance between the first glass body 10 and the second glass body 20, and the vacuum space 50 is easily formed.

  In the present embodiment, the first glass body 10 includes the mesh 11. The mesh 11 is disposed inside the first glass body 10. The first glass body 10 is, so to speak, formed of a netted glass plate. The fire resistance of the vacuum glass panel 1 is improved by the mesh glass plate. The strength of the vacuum glass panel 1 is improved by the meshed glass plate. The security of the vacuum glass panel 1 is improved by the meshed glass plate. When the glass is broken, the reticulated glass sheet is less likely to scatter the glass. Even when the fire occurs, even if the glass sheet containing heat is thermally cracked, the presence of the mesh 11 prevents scattering of the glass, thereby suppressing the passage of a flame and suppressing the spread of the fire.

  The mesh 11 is made of metal. The mesh 11 may be formed of, for example, iron or a metal material containing iron. The mesh 11 is formed of a plurality of lines 11 a and 11 b extending in two vertical directions. The mesh 11 has a lattice-like structure. The diameter (thickness of the line) of the mesh 11 is, for example, 0.1 to 1 mm.

  In the first glass body 10, the inner surface is defined as a first surface 10a, and the outer surface is defined as a second surface 10b. In the second glass body 20, the inner surface is defined as a first surface 20a, and the outer surface is defined as a second surface 20b. The first surface 10 a of the first glass body 10 and the first surface 20 a of the second glass body 20 are opposed to each other.

  An infrared reflective film may be provided on the first surface 10 a of the first glass body 10. An infrared reflective film may be provided on the first surface 10 a of the second glass body 20. The infrared ray reflective film blocks the infrared rays, thereby improving the heat insulation of the vacuum glass panel 1.

  For example, when the vacuum glass panel is applied to a building, the first glass body 10 is disposed on the outdoor side, and the second glass body 20 is disposed on the indoor side. Of course, conversely, the first glass body 10 may be disposed indoors, and the second glass body 20 may be disposed outdoor.

  The thickness of the first glass body 10 and the second glass body 20 is, for example, in the range of 1 to 10 mm. In the present embodiment, the thickness of the first glass body 10 is thicker than the thickness of the second glass body 20. When the thickness of the first glass body 10 is increased, the net 11 is strongly supported by the glass.

  As shown to FIG. 1A, the 1st glass body 10 and the 2nd glass body 20 are rectangular shape. The vacuum glass panel 1 is rectangular. The first glass body 10 and the second glass body 20 have the same outer edge in plan view. The plan view means that the vacuum glass panel 1 is viewed along the thickness direction.

  Examples of the material of the first glass body 10 and the second glass body 20 are, for example, soda lime glass, high strain point glass, chemically strengthened glass, non-alkali glass, quartz glass, neoceram, physically strengthened glass. In this case, the material of the first glass body 10 means the material of the glass portion other than the mesh 11.

  The vacuum space 50 is sealed by the first glass body 10, the second glass body 20 and the frame 30. The frame 30 functions as a sealer. The vacuum space 50 has a degree of vacuum equal to or less than a predetermined value. The predetermined value of the degree of vacuum is, for example, 0.01 Pa. The vacuum space 50 is formed by evacuation. The thickness of the vacuum space 50 is, for example, 10 to 1000 μm.

  The vacuum glass panel 1 may be provided with a gas adsorbent in the vacuum space 50. The gas adsorbent may include a getter. Since the gas of the vacuum space 50 is adsorbed by the gas adsorbent, the degree of vacuum of the vacuum space 50 is maintained, and the heat insulation property is improved. The gas adsorbent may be provided, for example, on any of the first surface 10a of the first glass body 10, the first surface 20a of the second glass body 20, the side portion of the frame 30, and the spacer 40.

  The frame 30 is formed of a glass adhesive. Glass adhesive includes heat melting glass. The heat melting glass is also referred to as low melting glass. The glass adhesive is, for example, a glass frit containing a heat melting glass. The glass frit is, for example, a bismuth-based glass frit, a lead-based glass frit, or a vanadium-based glass frit.

  The spacer 40 is disposed in the vacuum space 50. The spacer 40 is in contact with the first surface 10 a of the first glass body 10 and in contact with the first surface 20 a of the second glass body 20. The spacer 40 is disposed to overlap the mesh 11 in plan view. In the present embodiment, the spacer 40 is disposed at the intersection 11 c of the mesh 11. The intersection 11 c is an intersection of a line 11 a extending in the first direction and a line 11 b extending in the second direction. When the spacer 40 is disposed at the intersection 11c, the spacer 40 is less noticeable and the appearance of the vacuum glass panel 1 is improved. The diameter of the spacer 40 is, for example, 0.1 to 10 mm. The spacers 40 may be smaller than or equal to the width of the lines of the mesh 11. In that case, the spacer 40 is hidden and less noticeable.

  Hereinafter, a production example of the vacuum glass panel 1 will be described.

  2 and 3 show an example of manufacturing the vacuum glass panel 1. FIG. 2 consists of FIGS. 2A-2D. 2A to 2D are cross sectional views. FIG. 3 consists of FIG. 3A and FIG. 3B. 3A and 3B are plan views. In FIG. 3, the internal members are drawn as in FIG. 1A.

  In the manufacture of the vacuum glass panel 1, the glass composite 100 including the first glass body 10, the second glass body 20, the glass adhesive 300, and the spacer 40 is formed on the way. 2C and 3A show the glass composite 100. FIG.

  In manufacturing the vacuum glass panel 1, first, the first glass body 10 and the second glass body 20 are prepared. In FIG. 2A, the prepared first glass body 10 is shown. The first glass body 10 has an exhaust port 103. The exhaust port 103 is provided so as not to overlap with the mesh 11. The exhaust port 103 is an outlet of a hole penetrating the first glass body 10. The first glass body 10 has an exhaust pipe 104. The exhaust pipe 104 is provided outside the exhaust port 103.

  The preparation of the first glass body 10 includes placing the first glass body 10 in a predetermined device so that it can proceed to the next step (arrangement of glass adhesive, etc.). The preparation of the first glass body 10 may include providing the exhaust port 103 and the exhaust pipe 104 in the first glass body 10. Although only the first glass body 10 is drawn in FIG. 2A, the second glass body 20 is also separately prepared. The preparation of the second glass body 20 includes preparing the second glass body 20 of a predetermined size to be paired with the first glass body 10.

  Here, as the first glass body 10 and the second glass body 20 at the start of production, those larger than the sizes of the first glass body 10 and the second glass body 20 of the final vacuum glass panel 1 are used. In this production example, finally, a part of the first glass body 10 and the second glass body 20 is removed. The first glass body 10 and the second glass body 20 used for manufacture include a portion to be the vacuum glass panel 1 and a portion to be finally removed.

  Next, as shown to FIG. 2B, the glass adhesive 300 and the spacer 40 are arrange | positioned. The glass adhesive 300 contains a heat melting glass. The glass adhesive 300 is arranged in a frame shape. The glass adhesive 300 finally forms the frame 30. The glass adhesive 300 includes at least two glass adhesives of a first glass adhesive 301 and a second glass adhesive 302. The first glass adhesive 301 and the second glass adhesive 302 are respectively provided at predetermined places. In FIG. 2B, the second glass adhesive 302 is shown in dashed lines. This means that the second glass adhesive 302 is not provided in all in the direction along the short side of the first glass body 10. The arrangement of the first glass adhesive 301 and the second glass adhesive 302 can be understood from FIG. 3A.

  After the placement of the first glass adhesive 301 and the second glass adhesive 302, temporary firing may be performed. The first glass adhesive 301 and the second glass adhesive 302 are integrated with each other by pre-firing. However, the first glass adhesive 301 and the second glass adhesive 302 do not contact. By pre-baking, it is suppressed that the glass adhesive 300 flies carelessly. The first glass adhesive 301 and the second glass adhesive 302 may be fixed to the first glass body 10 by temporary baking.

  The spacer 40 is preferably disposed after the glass adhesive 300 is disposed. The spacer 40 is disposed at the intersection 11c of the network 11 (FIG. 3A). When the spacer 40 is placed on the first glass body 10, since the intersection point 11c is visually recognized, placement of the spacer 40 is easier than in the case where the spacer 40 is placed on the second glass body 20.

  In FIG. 2B, the glass adhesive 300 is disposed on the first glass body 10, but the glass adhesive 300 may be disposed by an appropriate method. For example, the glass adhesive 300 may be disposed on the second glass body 20. In addition, after the first glass body 10 and the second glass body 20 are disposed to be opposed to each other, the glass adhesive 300 may be injected and disposed in the gap between the first glass body 10 and the second glass body 20. In this case, the glass adhesive 300 is simultaneously disposed on both the first glass body 10 and the second glass body 20. In short, the glass adhesive 300 is disposed on at least one of the first glass body 10 and the second glass body 20.

  Also, a gas adsorbent may be disposed on the first glass body 10. The gas adsorber is provided by adhesion of a solid gas adsorber or application and drying of a fluid gas adsorber material.

  Next, as shown in FIG. 2C, the second glass body 20 is disposed on the glass adhesive 300. Thereby, the glass composite 100 including the first glass body 10, the second glass body 20, the glass adhesive 300, and the spacer 40 is formed. The glass composite 100 has an internal space 500 between the first glass body 10 and the second glass body 20. In FIG. 2C, the second glass adhesive 302 is shown in dashed lines. The second glass adhesive 302 does not completely divide the inner space 500.

  As shown in FIG. 3A, the first glass adhesive 301 is provided along the outer edge of the first glass body 10. The first glass adhesive 301 makes a round on the first glass body 10 to form a frame. The second glass adhesive 302 is provided corresponding to the end portion of the target vacuum glass panel 1. The arrangement position of the second glass adhesive 302 is within the range surrounded by the first glass adhesive 301.

  In FIG. 3A, two second glass adhesives 302 are arranged in the direction along the short side of the vacuum glass panel 1. The number of second glass adhesives 302 may be one or three or more. The second glass adhesive 302 is provided in the form of a wall. The second glass adhesive 302 divides the internal space 500 into two. However, the partitioning of the second glass adhesive 302 is not perfect, and is performed so that two spaces in the internal space 500 are connected. The two spaces in the internal space 500 are defined as a first space 501 far from the exhaust port 103 and a second space 502 near the exhaust port 103. The first space 501 and the second space 502 are separated by a second glass adhesive 302. The second space 502 is provided with an exhaust port 103. In the first space 501, the exhaust port 103 is not provided. In this production example, the first space 501 and the second space 502 are connected by the second glass adhesive 302 being separated from the first glass adhesive 301 and the two second glass adhesives 302 being separated. . The space between the first glass adhesive 301 and the second glass adhesive 302 and the space between the two second glass adhesives 302 function as an air passage when exhausting. In the exhaust process, the air in the first space 501 is exhausted through the air passage.

  Then, the glass composite 100 is heated. Glass composite 100 may be heated in a furnace. The heating raises the temperature of the glass composite 100. The glass adhesive 300 melts the glass by reaching the heat melting temperature, and develops adhesion. The melting temperature of the glass adhesive 300 exceeds 300 ° C., for example. The melting temperature of the glass adhesive 300 may exceed 400.degree. The first glass adhesive 301 and the second glass adhesive 302 have different heat melting temperatures.

  FIG. 4 is a schematic graph for explaining an example of the temperature change in this production example. The horizontal axis of the graph represents time, and the vertical axis represents temperature. In the graph of FIG. 4, the temperature rises first to reach the temperature Tm1 and maintains this temperature Tm1 for a while, then drops slightly to become the temperature Te, and then rises again to reach the temperature Tm2, this temperature Tm2 After maintaining a little, it falls to the end temperature. The heating to the temperature Tm1 is defined as the first heating step. Heating from temperature Te to temperature Tm2 is defined as the second heating step.

  In the present production example, the first glass adhesive 301 melts at a temperature lower than that of the second glass adhesive 302. That is, the first glass adhesive 301 melts before the second glass adhesive 302. In the first heating step, the first glass adhesive 301 is melted, and the second glass adhesive 302 is not melted. When the first glass adhesive 301 is melted, the first glass adhesive 301 bonds the first glass body 10 and the second glass body 20, and the internal space 500 is sealed. The temperature at which the first glass adhesive 301 melts and the second glass adhesive 302 does not melt is defined as the first melting temperature. At the first melting temperature, the second glass adhesive 302 maintains its shape because the second glass adhesive 302 does not melt. The first melting temperature corresponds to the temperature Tm1 of FIG.

  After reaching the first melting temperature, evacuation is started, and the gas in the internal space 500 is exhausted. The evacuation may be performed at a temperature lower than the first melting temperature. Temperature Te in FIG. 4 is a temperature at which exhaust is started. In addition, if the shape of the glass composite 100 is not disturbed, exhaust may be started before reaching the first melting temperature.

  Exhaust may be performed with a vacuum pump connected to the exhaust port 103. Connected to the exhaust pipe 104 is a pipe extending from the vacuum pump. By evacuation, the internal space 500 is depressurized and shifted to a vacuum state. In addition, the exhaust of this production example is an example, and another exhaust method may be adopted. For example, the entire glass composite 100 may be placed in a vacuum chamber, and the entire glass composite 100 may be evacuated.

  In FIG. 2C, the evacuation of the gas from the interior space 500 is indicated by the downward arrow. Also, the flow of air moving from the first space 501 to the second space 502 is indicated by an arrow pointing to the right. As described above, since the second glass adhesive 302 is disposed to provide the vent, air is exhausted from the exhaust port 103 through the vent. Thereby, the internal space 500 including the first space 501 and the second space 502 becomes vacuum.

  After the degree of vacuum of the internal space 500 reaches a predetermined value, the heating temperature to the glass composite 100 is raised (second heating step). The heating temperature is raised while continuing the exhaust. Due to the increase of the heating temperature, the temperature reaches a second melting temperature higher than the first melting temperature. The second melting temperature is, for example, 10 to 100 ° C. higher than the first melting temperature. The second melting temperature corresponds to the temperature Tm2 in FIG.

  At the second melting temperature, the second glass adhesive 302 melts. The melted second glass adhesive 302 bonds the first glass body 10 and the second glass body 20 at the location of the second glass adhesive 302. Furthermore, the second glass adhesive 302 is softened by its meltability. The softened second glass adhesive 302 deforms and blocks the air passage. In the present production example, the gap (air passage) provided between the first glass adhesive 301 and the second glass adhesive 302 is closed. In addition, the gap (air passage) provided between the two second glass adhesives 302 is closed. In addition, the 2nd glass adhesive agent 302 has the closure part 302a which the quantity of the 2nd glass adhesive agent 302 increased in the both ends so that it may be easy to block a ventilation path (FIG. 3A). The closing portion 302 a extends in the direction along the long side of the vacuum glass panel 1 at the end of the second glass adhesive 302. The closing portion 302a is deformed to close the air passage.

  Figures 2D and 3B show the glass composite 100 after the air passage has been blocked. The glass composite 100 is integrated by the adhesive action of the glass adhesive 300. The integrated glass composite 100 becomes an intermediate panel (defined as an integrated panel 200).

  The vacuum space 50 is formed by dividing the internal space 500 into the vacuum space 50 far from the exhaust port 103 and the exhaust space 51 near the exhaust port 103. The deformation of the second glass adhesive 302 creates a vacuum space 50. The vacuum space 50 is formed of a first space 501. The exhaust space 51 is formed of a second space 502. The vacuum space 50 and the exhaust space 51 are not connected. The vacuum space 50 is sealed by a first glass adhesive 301 and a second glass adhesive 302.

  In the integrated panel 200, the first glass adhesive 301 and the second glass adhesive 302 are integrated to form the frame 30. The frame 30 surrounds the vacuum space 50. The frame 30 also surrounds the exhaust space 51. The first glass adhesive 301 is a part of the frame 30, and the second glass adhesive 302 is another part of the frame 30.

  By the way, the melting of the glass adhesive 300 may be such that the heat melting glass is softened by heat and can be deformed or adhered. The meltability that the glass adhesive 300 flows out may not be exhibited.

  After formation of the vacuum space 50, the integrated panel 200 is cooled. In addition, after the formation of the vacuum space 50, the evacuation ends. Since the vacuum space 50 is sealed, the vacuum is maintained even if the exhaust is removed. However, for safety, the exhaust is turned off after the integrated panel 200 is cooled. The exhaust space 51 may return to normal pressure by the end of the exhaust.

  Finally, the integrated panel 200 is cut. The integrated panel 200 includes a portion to be the vacuum glass panel 1 (defined as the glass panel portion 101) and an unnecessary portion (defined as the unnecessary portion 102). Glass panel portion 101 includes a vacuum space 50. The unnecessary portion 102 includes the exhaust port 103.

  In FIG. 2D and FIG. 3B, the cut portion of the integrated panel 200 is shown by a broken line (cut line CL). The integrated panel 200 is cut along, for example, the outer edge of the frame 30 in a portion to be the vacuum glass panel 1. The integrated panel 200 is cut where the vacuum space 50 is not broken.

  By cutting the integrated panel 200, the unnecessary portion 102 is removed and the glass panel portion 101 is taken out. From the glass panel portion 101, the vacuum glass panel 1 shown in FIG. 1 is obtained.

  Here, in the present production example, a netted glass plate is used as a material. Since a netted glass plate is a composite material of net and glass, the thermal expansion differs greatly between the net portion and the glass portion. Therefore, it is important to consider the difference in their thermal expansion when using a reticulated glass plate. In addition, the glass sheet with a mesh tends to have a thermal expansion coefficient larger than that of a glass sheet without a mesh (a normal glass sheet). Therefore, in the case of combining a reticulated glass plate and a normal glass plate (for example, a plate made of soda glass), it is important to consider the difference in the thermal expansion of these glass plates. Patent Document 1 (Japanese Patent No. 3312159) discloses a design considering thermal expansion, but the present disclosure can provide a more effective method than the method of Patent Document 1. Hereinafter, the manufacturing method of the vacuum glass panel of this indication is explained according to the above-mentioned manufacture example.

First, we focus on the difference between glass plates. The thermal expansion coefficient of the metal mesh is higher than the thermal expansion coefficient of glass. Also, the incorporation of the mesh enhances the thermal expansion of the glass material. Therefore, the thermal expansion coefficient of the mesh glass sheet is higher than the thermal expansion coefficient of a normal glass sheet. For example, the thermal expansion coefficient of the mesh may be on the order of 100 to 110 × 10 ⁻⁷ . On the other hand, when a general glass plate is made of soda glass, the thermal expansion coefficient may be about 87 to 90 × 10 ⁻⁷ . And the thermal expansion coefficient of a netted glass board can become about 91-92 * 10 < ^-7 > by containing of a net | network. These thermal expansion differences can cause warping or breakage of the vacuum glass panel.

  Moreover, the heat history received when a glass plate is manufactured differs between a net glass plate and a normal glass plate. For example, a netted glass sheet is heated several times during the netting process. A glass plate shrink | contracts by passing through heating and cooling normally. Contracting is called compaction. A glass plate is usually manufactured by pulling molten glass. Therefore, stress at the time of tension remains inside the glass plate, and when reheated, the glass plate shrinks due to the stress at the time of cooling. For example, a glass plate made of sorter glass can shrink by about 100 to 150 ppm in length. However, since the meshed glass plate is subjected to heat in the process of manufacturing the meshed glass plate, it is already shrunk to a certain extent, and the contraction rate is smaller than that of a normal glass plate. This difference in shrinkage can cause warping or breakage of the vacuum glass panel.

  Also, the meshed glass sheet can be thicker than a normal glass sheet. The shrinkage rate of the glass plate tends to increase as the thickness of the glass plate decreases. Therefore, the difference in thickness of the glass plate can also cause the warp.

  In view of the above-mentioned cause of warpage and breakage, in the manufacturing example of the vacuum glass panel, the vacuum glass panel is manufactured by the following method.

  In this production example, the temperature rising rate in heating in the step of bonding the first glass body 10 and the second glass body 20 is set to 150 ° C./hour or less. That is, the temperature of the glass composite 100 rises at a pace of 150 ° C. or less per hour. When the temperature rise rate becomes 150 ° C./hour or less, the expansion of the screen 11 prevents breakage of the glass of the first glass body 10. If the temperature rise rate is large (for example, 200 ° C./hour), the first glass body 10 (the meshed glass plate) is easily broken due to the difference in thermal expansion between metal and glass. The temperature rising rate is 150 ° C./hour or less until at least the first glass adhesive 301 is melted. In the example of the temperature change of FIG. 4, the temperature rising rate is 150 ° C./hour or less until the temperature Tm1 is reached. The heating rate may be 150 ° C./hour or less until the second glass adhesive 302 melts. In the example of the temperature change of FIG. 4, the temperature rising rate is 150 ° C./hour or less until the temperature Te reaches the temperature Tm2. The temperature rising rate is preferably 130 ° C./hour or less, more preferably 120 ° C./hour or less, still more preferably 110 ° C./hour or less, and still more preferably 100 ° C./hour or less. However, when the temperature rise rate decreases, the manufacturing efficiency tends to decrease. Therefore, the temperature rising rate is preferably 50 ° C./hour or more, more preferably 60 ° C./hour or more, further preferably 70 ° C./hour or more, and even more preferably 80 ° C./hour or more.

  The test example of the above-mentioned temperature rising rate is shown. The mesh glass plate was used as the first glass body 10, and the glass plate without the mesh was used as the second glass body 20, and the vacuum glass panel 1 was manufactured on a trial basis. At that time, heating was performed under three conditions of a temperature rising rate of 100 ° C./hour, 150 ° C./hour, and 170 ° C./hour. In this test, at 100 ° C./hour and 150 ° C./hour, there was no breakage in the mesh glass plate, but at 170 ° C./hour, cracking occurred during heating and breakage occurred in the mesh glass plate . Therefore, it was confirmed that the temperature rising rate is preferably 150 ° C./hour or less. However, since there can be various types of meshed glass plates, it is preferable that the heating rate be lower in order to prevent cracking of various types of meshed glass plates.

  In the present production example, after the formation of the vacuum space 50, the integrated panel 200 is cooled. More preferably, the cooling rate (temperature reduction rate) at the time of cooling is controlled. If it cools rapidly, the glass may be broken due to the thermal expansion difference between the mesh 11 and the glass. The cooling rate is represented by the amount of temperature decrease per hour. The cooling rate is preferably 150 ° C./hour or less, preferably 130 ° C./hour or less, and more preferably 110 ° C./hour or less. However, in order to increase the production efficiency, the cooling rate should be high. The cooling rate is preferably 50 ° C./hour or more, and more preferably 80 ° C./hour or more.

In this production example, the thermal expansion coefficient (α ₂ ) of the second glass body 20 is smaller than the thermal expansion coefficient (α ₁ ) of the first glass body 10, and the thermal contraction rate (C ₂ ) of the second glass body 20 Is larger than the thermal contraction rate (C ₁ ) of the first glass body 10. That is, the second glass body 20 having a smaller coefficient of thermal expansion and a larger thermal contraction rate than the first glass body 10 (glass plate with mesh) is selected. Thereby, the dimensional difference by the load of the heat of two glass plates (the 1st glass body 10 and the 2nd glass body 20) becomes small, and curvature is reduced effectively. The reason will be described below.

  The first glass body 10 and the second glass body 20 are bonded at high temperature (for example, 430 ° C.) as described above. Under high temperature, the first glass body 10 and the second glass body 20 expand due to the action of thermal expansion. Then, the first glass body 10 and the second glass body 20 return to expansion due to cooling, and further shrink more than their original size due to thermal contraction. Thus, the first glass body 10 and the second glass body 20 are bonded in the state of thermal expansion, and after cooling, they shrink more than their original size, so warpage is likely to occur due to their dimensional difference. Become. In short, the first glass body 10 and the second glass body 20 expand and contract due to heat load. By thermal load is meant a thermal cycle that includes heating upon bonding of the two glass bodies and cooling after bonding of the glass bodies. Here, when the second glass body 20 has a thermal expansion coefficient smaller than that of the first glass body 10 and has a large thermal contraction rate, as described below, this dimensional difference is easily absorbed.

  FIG. 5 is a graph schematically showing thermal expansion and thermal contraction of the glass body. The horizontal axis of the graph is the temperature, and the vertical axis is the length of the glass body. The glass body of length L expands X by the increase in temperature. The length of the glass body at this point is L + X. In addition, the glass body after cooling shrinks by Y from its original length due to heat load. The length of the glass body at this point is L-Y. As a result, the glass body shrinks in length by X + Y based on the bonding time. This phenomenon occurs in the first glass body 10 and the second glass body 20.

Assuming that the expansion amount of the first glass body 10 at the time of thermal expansion is X ₁ and the contraction amount at which the first glass body 10 contracts due to thermal load is Y ₁ , the first glass is consequently based on the adhesion time. The body 10 shrinks by an amount of X ₁ + Y ₁ . Further, assuming that the expansion amount of the second glass body 20 at the time of thermal expansion is X _2, and the contraction amount at which the second glass body 20 contracts due to thermal load is Y ₂ , as a result, based on the adhesion time, The two glass body 20 shrinks by the amount of X ₂ + Y ₂ .

Thus, due to thermal expansion and thermal contraction of the glass body, the two glass bodies are based on the bonding time,
ΔD = | (X ₁ + Y ₁ )-(X ₂ + Y ₂ ) |
The dimensional difference ΔD represented by This formula is
ΔD = | (X ₁ −X ₂ ) + (Y ₁ −Y ₂ ) |
And transformed. Furthermore, this equation is
ΔD = | (X ₁ −X ₂ ) − (Y ₂ −Y ₁ ) |
Both are deformed.

Here, assuming that the expansion amount X of the glass body is the thermal expansion coefficient α, the rising temperature ΔT, and the length L of the glass body,
X = L x α x ΔT
It becomes.

That is, the larger the thermal expansion coefficient, the larger the amount of expansion. Therefore, in the two glass bodies, X ₁ > X ₂ holds for α ₁ > α ₂ .

Here, the unit of the thermal expansion coefficient (α ₁ , α ₂ ) is [/ ° C.].

Also, assuming that the shrinkage amount Y of the glass body is the shrinkage rate C and the length L of the glass body,
Y = L x C
It becomes.

That is, the larger the contraction rate, the larger the contraction amount. Therefore, in the two glass bodies, Y ₁ <Y ₂ holds for C ₁ <C ₂ .

The contraction rate (C ₁ , C ₂ ) depends on the rising temperature ΔT, and is expressed as a function of ΔT. That is, the contraction rate can be changed by the heating temperature of the glass body.

As described above, when the relationship between X ₁ > X ₂ and Y ₁ <Y ₂ simultaneously holds, the dimensional difference between the two glass bodies is reduced, as can be seen from the above-described relationship of ΔD. In short, thermal expansion and contraction partially cancel out. Therefore, the generation of strain in the two glass bodies due to heat is suppressed, and the warpage of the glass panel is reduced.

  Specific examples of thermal expansion and thermal contraction are given. For example, consider the case where the temperature before heating is 30 ° C., the temperature at bonding is 430 ° C., and the temperature after cooling is 30 ° C. In this example, ΔT is 400 ° C. ΔT is a temperature that rises when the first glass body 10 and the second glass body 20 are bonded by the frame 30. Also, consider the length of two glass bodies as 1 m. The second glass body 20 is made of soda glass. The first glass body 10 is a glass plate made of soda glass including a mesh 11 made of iron.

Then, it is assumed that the difference between alpha ₁ and α ₂ (α ₁ -α ₂₎ is 2 × ^{10 -7.} Then, from the above-mentioned equation of thermal expansion, the difference (X ₁ −X ₂ ) in the amount of thermal expansion of the two glass bodies is 80 μm. That is, the first glass body 10 expands more than the second glass body 20 by 80 μm. In other words, the first glass body 10 returns to the original size by 80 μm when cooled, compared to the second glass body 20. Thus, X ₁ -X ₂ is 80 μm.

Here, the first glass body 10 and the second glass body 20 are selected such that the amount of shrinkage of the second glass body 20 is about 100 μm per 1 m and the amount of shrinkage of the first glass body 10 is 30 μm per 1 m. . At this time, C ₂ > C ₁ holds. Then, the second glass body 20 has a function of shrinking from the original size of the first glass body 10 by 70 μm. Thus, Y ₂ -Y ₁ is 70 μm.

From the above 80 μm (X ₁ -X ₂ ) and 70 μm (Y ₂ -Y ₁ ), ΔD is eventually 10 μm. In this case, the dimensional difference between the first glass body 10 and the second glass body 20 from bonding to cooling is as small as 10 μm. When the dimensional difference is 10 μm, the vacuum glass panel 1 usually does not warp or break. As described above, when the thermal expansion coefficient and the thermal contraction rate have a predetermined relationship, warpage and damage of the vacuum glass panel 1 are suppressed.

If the difference between thermal expansion (X _1- X ₂ ) and the difference between thermal contractions (Y _2- Y ₁ ) are in completely different orders, there is a possibility that the cancellation of thermal expansion and thermal contraction does not work well. However, such problems do not easily occur if a normal glass material is used as in the above-described specific example.

  Moreover, although the thermal expansion and thermal contraction at the time of manufacture of the vacuum glass panel 1 were demonstrated above, the said relationship may be satisfy | filled also in the vacuum glass panel 1 after manufacture. This is because the thermal expansion property magnitude relationship and the heat shrinkage property magnitude relationship do not change even after the thermal load.

In this production example, the difference between the thermal expansion coefficient of the first glass member 10 (alpha ₁₎ and the thermal expansion coefficient of the second glass member _{20 (α 2) (α 1} -α 2) is, 1 × ^{10 -7} ~ It is preferable that it is 5 * 10 <^-7> . Further, the difference between the thermal shrinkage rate of the first glass member 10 _{(C 1)} and the thermal shrinkage of the second glass member _{20 (C 2) (C 2} -C 1) is preferably 10 to 300 ppm. In this case, since thermal expansion and thermal contraction are offset more efficiently, warpage and breakage of the vacuum glass panel 1 are more effectively suppressed. In addition, this preferable aspect is applied also to the vacuum glass panel 1 after manufacture.

In this production example, the thermal expansion coefficients (α ₁ , α ₂ ) and thermal contraction rates (C ₁ , C ₂ ) are
(Α ₁ -α ₂ ) × ΔT- (C ₂ -C ₁ ) <6 × 10 ⁻⁵
It is preferable to satisfy the following relationship. In this case, the thermal expansion and the thermal contraction are offset more efficiently, so the warping or breakage of the vacuum glass panel 1 is more effectively suppressed. In addition, this preferable aspect is applied also to the vacuum glass panel 1 after manufacture.

By the way, although the case where the 1st glass body 10 is a netting glass plate was mentioned in the above-mentioned example of manufacture, when the 1st glass body 10 is not a netting glass plate (that is, both of a pair of glass bodies are netting glass) Also in the case of non-plates, the above-described method of offsetting thermal expansion and contraction is effective. In short, when the thermal expansion coefficients of the first glass body 10 and the second glass body 20 are different, it is effective to satisfy the relationship of α ₁ > α ₂ and C ₂ > C ₁ . When the materials of the first glass body 10 and the second glass body 20 are different, α ₁ and α ₂ may be different. For example, when one of the first glass body 10 and the second glass body is a special glass exemplified as a tempered glass or a heat resistant glass, and the other glass body is a normal glass, the above-mentioned Techniques may be applied.

  In addition, when the 1st glass body 10 and the 2nd glass body 20 do not satisfy | fill the relationship of the said thermal expansion coefficient and thermal contraction rate, one of the 1st glass body 10 and the 2nd glass body 20 is preheated, May be In the preheating, the glass body is heated as it is. The preheating reduces the shrinkage of the glass body. By the preheating, the first glass body 10 and the second glass body 20 can be changed such that the first glass body 10 and the second glass body 20 satisfy the above-described relationship between the thermal expansion coefficient and the thermal contraction rate. The preheating may be annealing. Preheating is performed in preparation of the first glass body 10 and the second glass body 20.

  In the above production example, the first glass body 10 includes the mesh 11 and the second glass body 20 does not include the mesh. However, the 1st glass body 10 and the 2nd glass body 20 are not limited to the above-mentioned mode. For example, both the first glass body 10 and the second glass body 20 may include a mesh. In this case, a vacuum glass panel including a pair of meshed glass plates (glass body having mesh) is obtained.

  In the above manufacturing example, the example in which the first glass body 10 has the exhaust port 103 is shown. However, the second glass body 20 may have an exhaust port.

  In the above manufacturing example, an example is shown in which unnecessary portions of the first glass body 10 and the second glass body 20 are cut. However, the first glass body 10 and the second glass body 20 may not be cut. For example, after exhausting, the exhaust port 103 of the first glass body 10 may be closed while the vacuum of the internal space 500 is maintained. The closing of the exhaust port 103 can be performed by thermal welding of glass and attachment of a cap. In this case, the integrated panel 200 becomes the vacuum glass panel 1 as it is. In this case, the second glass adhesive 302 may not be present. In this case, the internal space 500 becomes the vacuum space 50 as it is. However, from the viewpoint of aesthetics, the vacuum glass panel 1 preferably has no exhaust port.

  As mentioned above, the manufacturing method of the vacuum glass panel of this indication is the process of arrange | positioning a glass adhesive, the process of making a pair of glass bodies oppose, arrange | positioning a pair of glass bodies, and internal space And evacuating, and forming a vacuum space. The first glass body 10 includes a mesh 11. In the step of disposing the glass adhesive, the glass adhesive 300 including the heat-melting glass is disposed in a frame shape on at least one of the first glass body 10 and the second glass body 20. In the step of arranging the pair of glass bodies to face each other, the first glass body 10 and the second glass body 20 are arranged to face each other. In the step of bonding the pair of glass bodies, the glass composite 100 including the first glass body 10, the second glass body 20, and the glass adhesive 300 is heated, and the first glass body 10 and the first glass body 100 are 2. Bond with the glass body 20. In the process of evacuating the internal space 500, the internal space 500 surrounded by the first glass body 10, the second glass body 20, and the glass adhesive 300 is evacuated. In the process of forming the vacuum space, the inner space 500 is sealed to form the vacuum space 50 from the inner space 500. The temperature rising rate in heating in the step of bonding the first glass body 10 and the second glass body 20 is 150 ° C./hour or less.

  In the method of manufacturing the vacuum glass panel 1 of the present disclosure, the thermal expansion of the mesh 11 reduces breakage of the glass, and the breakage of the vacuum glass panel 1 is effectively suppressed.

  The step of forming the vacuum space preferably includes dividing the inner space 500 into a vacuum space 50 far from the exhaust port 103 and an exhaust space 51 near the exhaust port 103. Thereby, the vacuum glass panel 1 having an excellent appearance can be easily obtained.

  The method of manufacturing the vacuum glass panel 1 of the present disclosure preferably further includes the step of cutting the integrated panel 200 and taking out the portion (glass panel portion 101) including the vacuum space 50 of the integrated panel 200. Thereby, the vacuum glass panel 1 having an excellent appearance can be easily obtained. In the integrated panel 200, the first glass body 10, the second glass body 20, and the glass adhesive 300 are integrated.

  The method of manufacturing the vacuum glass panel 1 of the present disclosure further includes the step of cooling the integrated panel 200 in which the first glass body 10, the second glass body 20 and the glass adhesive 300 are integrated after the vacuum space 50 is formed. May be included. And it is preferable that the cooling rate in the process of cooling the integrated panel 200 is 150 degrees C / hour or less. Thereby, breakage of the vacuum glass panel 1 is effectively suppressed.

DESCRIPTION OF SYMBOLS 1 Vacuum glass panel 10 1st glass body 11 net | network 20 2nd glass body 50 vacuum space 51 exhaust space 100 glass composite 103 exhaust port 300 glass adhesive agent 500 internal space

Claims (4)

Disposing a glass adhesive comprising a heat-fusible glass in a frame shape on at least one of a first glass body comprising a net and a second glass body;
Arranging the first glass body and the second glass body to face each other;
Heating the glass composite containing the first glass body, the second glass body, and the glass adhesive, and bonding the first glass body and the second glass body with the glass adhesive;
Exhausting an internal space surrounded by the first glass body, the second glass body, and the glass adhesive;
Sealing the interior space to form a vacuum space from the interior space;
Including
The temperature rising rate in heating in the step of bonding the first glass body and the second glass body is 150 ° C./hour or less.
Method of manufacturing a vacuum glass panel The step of forming the vacuum space includes dividing the inner space into a vacuum space far from the exhaust port and an exhaust space close to the exhaust port.
The manufacturing method of the vacuum glass panel of Claim 1. The method further includes the step of cutting an integrated panel in which the first glass body, the second glass body, and the glass adhesive are integrated, and taking out a portion including the vacuum space of the integrated panel.
The manufacturing method of the vacuum glass panel of Claim 2. The method further includes the step of cooling an integrated panel in which the first glass body, the second glass body, and the glass adhesive are integrated after forming the vacuum space.
The cooling rate in the step of cooling the integrated panel is 150 ° C./hour or less.
The manufacturing method of the vacuum glass panel of any one of Claims 1-3.

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