JP2010006684A - Multiple glass - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multiple glass with a simple structure having the total thickness of ≤25.0 mm and thermal transmittance of ≤3.50 W/m<SP>2</SP>K, and also passes the sound insulation class T-3 according to JIS A4706:2000. <P>SOLUTION: There is a multiple glass where three glass plates G1, G2, G3 are separately arranged, respectively, so as to provide two hollow layers 1, 2, air is sealed into either of the two hollow layers, helium is sealed into the another, the thickness of the two glass plates on both the sides composing the multiple glass and the thickness of the two hollow layers are symmetrical viewed from the glass plate at the inside, the thickness of the glass plate G2 at the inside and the thickness of the two glass plates G1, G3 on both the sides are different, and the total thickness of the multiple glass is 18.0 to 25.0 mm. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a multi-layer glass having heat insulation performance and sound insulation performance. In particular, the present invention relates to a lightweight and thin multilayer glass that can be mounted on a sash.

  Usually, a double-glazed glass is formed by attaching an aluminum spacer with a butyl rubber adhesive to the peripheral edge of a pair of glass plates, and bonding and integrating the pair of glass plates and the aluminum spacer with a butyl rubber adhesive. A U-shaped recess made of an aluminum spacer is filled with a sealing material made of polysulfide or silicone and sealed. Therefore, the double-glazed glass has a sealed hollow layer surrounded by a glass plate and an aluminum spacer.

  The double-glazed glass has advantages such as increased heat insulation performance due to the presence of a hollow layer, prevention of dew condensation, and reduction of the load on indoor air conditioning, and is now widely used as a glass sash. A glass sash is a glass plate that includes double-glazed glass, laminated glass, laminated double-glazed glass, etc., and a frame is prepared and adjusted in advance, and it is attached to doors such as fixed windows, movable windows, and open / close doors. At that time, it can be handled as a single component.

Also, in ordinary houses, especially apartment buildings, office buildings, etc., room temperature is actively controlled so that it can be comfortably enjoyed in hot summers and cold winters. Has come to be required. Windows have been required to block the temperature fluctuations of the outside air by increasing the heat insulation. The necessary heat insulation performance of the glass for energy saving is “suitable for window glass in each region in Japan” according to “Design and Construction Guidelines for Rational Use of Energy Related to Housing H11.3030 Revised Ministry of Construction Notification No. 998” The heat transfer rate is described. That is, the heat transmissivity of the window glass as a fitting in a cold region centering on Hokkaido (1.2 district) is 2.08 W / m ² · K or less, that is, 2.08 W · m ^-2 · K ^-1 or less. , Tohoku, Nagano, etc. The heat transmissivity of window glass required in cold districts (3 districts) mainly in Honshu is 3.01 W / m ² · K or less, from central Tokyo, Nagoya, Osaka, Fukuoka, etc. The heat transmissivity of the window glass required in the southern area (4.5 area) is 4.00 W / m ² · K or less. In addition, about the calculation method of the heat insulation performance of glass, it is described in "The calculation method of the thermal resistance of a plate glass, and the heat transmissivity in a building" JISR3107: 1998.

  Also, in recent years, in general houses, especially apartment houses, near roads, along railway lines and around airports, buildings, audio rooms, piano rooms, libraries, museums, etc., unacceptable sounds, or transmission of music and conversation There is a growing interest in noise, which is a sound that hinders sound, and sound absorbing materials are embedded in floors, walls, ceilings, and the like of buildings, and soundproofing or soundproofing doors are also used for doors. In addition, even a window through which sound easily passes is required to have sound insulation performance as well as heat insulation performance. Therefore, the window has been required to attenuate sound, which is a longitudinal wave transmitted as a dense wave of a medium such as air.

  Double-layer glass is excellent in heat insulation performance, but its sound insulation performance is low compared to a glass plate of the same thickness including a hollow layer. This is because the higher the density of the object, the more easily the sound is absorbed and attenuated, and it is less likely to vibrate due to the solid resistance.

  The coincidence effect is a phenomenon in which transmission loss decreases at a specific frequency in a plate-like material, in other words, sound insulation performance decreases. Specifically, when sound is incident obliquely on the plate surface, there is a phase difference in the sound pressure depending on the position on the plate surface, so that inherent bending forced vibration occurs along the plate surface, and sound is transmitted at a certain frequency. This is a phenomenon in which the sound insulation performance deteriorates due to an increase in the noise.

  In a glass plate, when a sound wave, which is a longitudinal elastic wave, is obliquely incident on the glass surface, a transverse vibration wave is generated on the glass surface due to the coincidence effect, and the sound insulation performance is reduced by resonance, which exceeds the coincidence limit frequency. Sound insulation performance decreases in the frequency range. The lowest frequency at which the coincidence phenomenon occurs is called the coincidence limit frequency, and there is a correlation between the coincidence limit frequency and the glass thickness. When the glass becomes thicker and the bending rigidity increases, the coincidence limit frequency decreases. It has been known. In the sound insulation of the sash, the occurrence of this coincidence effect must be suppressed.

  The coincidence limit frequency is expressed by the equation (1).

  Moreover, the standard of the sound insulation performance of a sash is described in "Sash" JIS A4706: 2000. That is, in JIS A4706: 2000, the sound insulation of the sash is divided into sound insulation grades T-1, T-2, T-3, and T-4. Sound is transmitted from one side of the sash, and the sound transmission loss of the sash is measured at each frequency defined in the JIS standard by measuring the reflection of sound by the sash and the decrease in sound pressure level due to absorption attenuation on the opposite side. In accordance with the -1 grade line, the T-2 grade line, the T-3 grade line, and the T-4 grade line, the sashes that meet the conditions described in the above JIS, that is, passed the sound insulation grade T-1 grade, respectively. , T-2 grade, T-3 grade, T-4 grade.

  Usually, sound insulation double-glazed glass has a glass plate with different thickness to prevent the above-mentioned sound resonance and not to amplify a specific wavelength, and to convert sound into thermal energy as kinetic energy of atoms and molecules By enclosing a special gas that absorbs sound waves, sound insulation performance that passes the sound insulation class T-3 is realized.

As multi-layer glass having heat insulation performance and sound insulation performance, Patent Document 1 discloses a multi-layer glass composed of three glass plates stacked at a predetermined interval via a spacer and having a hollow layer between the glass plates. 1, at least one of the glass plates is Low-E (Low-emissitivity) glass having a surface coated with a low-radiation film that suppresses heat transfer, and an inert gas is sealed in each of the hollow layers. The thickness of each plate glass is different, and at least one of them is laminated glass, and the sound insulation performance in a wide sound range can clear T-3 (35 grade) of JIS A4706: 2000, and general houses A multilayer glass that is suitable as an outer wall for use and excellent in heat insulation is disclosed.
JP 2005-60141 A

The multilayer glass described in Patent Document 1 uses Low-E glass in which at least one glass plate is coated with a low-emission film that suppresses heat transfer on the surface, and each of the hollow layers has an inert gas, In the examples, argon and krypton are enclosed, and as an effect, it passes the sound insulation grade T-3 grade, and the thermal conductivity is 0.65 W / m ² · K or more and 1.11 W / m ² · K or less. It has become. However, using Low-E glass and further enclosing argon and krypton in each hollow layer is troublesome and expensive. Moreover, since argon, krypton, and xenon are heavy gases, when sealed in the hollow layer, the heat insulation performance is improved, but the sound insulation performance is not improved.

In the multilayer glass in which helium is sealed, it is possible to pass the T-3 grade with a total thickness of 18 mm or more and 24 mm or less including the two glass plates and the hollow layer. However, if only the helium, which is easy to transfer heat, is sealed in the hollow layer, the heat transmissivity of the window glass will increase to around 4.60 W / m ² · K, and the main markets of Tokyo, Nagoya, Osaka, Fukuoka, etc. The heat transmissivity of the window glass required in the district from the center to the south (4.5 district) is less than 4.00 W / m ² · K.

  In addition, the maximum thickness of the glass plate that can be applied to a commercially available sash frame is at least 25.0 mm. If it is thicker than that, it cannot be handled by a general-purpose multilayer glass sash frame, and is custom-ordered, increasing the price. To do.

In the present invention, the total thickness of the glass plate portion and the hollow layer portion is 25.0 mm or less, and the thermal conductivity is 3.50 W / m ² · K or less. An object of the present invention is to provide a double-glazed glass having a heat insulating performance and a sound insulation performance that are simple and easy to fabricate.

  In a double-glazed glass with two hollow layers separated from each other by three glass plates, if one gas sealed in the hollow layer is helium and the other gas is air, both heat insulation performance and sound insulation performance are improved. did. This is because helium is sealed in the hollow layer with the same temperature and pressure and the mass per unit volume is small, and the sound insulation performance is improved in the entire audible band. This is because the thermal conductivity of the double-glazed glass was lowered by enclosing air with excellent performance. In addition, since the multi-layer glass having a three-layer structure has a large number of interfaces between the respective layers, there is an effect of suppressing heat transfer due to radiation from the outside due to reflection at the interfaces.

  That is, according to the present invention, in a double-glazed glass having two hollow layers with three glass plates spaced from each other, air is enclosed in one of the two hollow layers and helium is sealed in the other. It is a layer glass.

  In addition, in the double-glazed glass having two hollow layers by separating the three glass plates from each other, the thickness of the two glass plates on both sides constituting the double-glazed glass and 2 The thicknesses of the two hollow layers are the same as each other when viewed from the inner glass plate, and the two glass plates on both sides and the inner glass plate have different thicknesses. The thickness of the two glass plates on both sides and the inner glass while the thickness of the two glass plates on both sides and the thickness of the two hollow layers constituting the multilayer glass are equally symmetric when viewed from the inner glass plate By varying the thickness of the plate, the coincidence effect is suppressed, and air and helium, which are gases of different mass per unit volume at the same temperature and pressure, are enclosed in two hollow layers. As a result, it was structurally symmetric as viewed from the inside glass plate, but became acoustically asymmetric, and resonance was suppressed.

  Further, according to the present invention, the thickness of the two glass plates on both sides and the thickness of the two hollow layers constituting the double-glazed glass are symmetric when viewed from the inner glass plate, It is said multilayer glass characterized by the thickness of a glass plate differing.

  In the double-glazed glass of the present invention, a double-glazed glass having two hollow layers separated from each other by three glass plates is used, so that it is 25.0 mm or less that can be mounted on a commercially available sash frame. The thickness of the hollow layer was 4.0 mm or less, and the total thickness of the two glass plates on both sides and the internal glass plate was 17.0 mm or less.

  As described above, in order to prevent the sound insulation performance from being lowered due to the occurrence of the coincidence effect based on the upper limit, the internal glass plate and the glass plates on both sides have different thicknesses, and the thicknesses are different by 2.0 mm or more. I made it. The total thickness of the internal glass plate and the glass plates on both sides was set to 12.0 mm or more and 17.0 mm or less.

In this way, one gas sealed in the hollow layer is helium and the other gas is air, and the thickness of each hollow layer is 3.0 mm or more and 4.0 mm in the above-described double-glazed structure. In the following, preferably 3.5 mm or more and 4.0 mm or less, “the calculation method of the thermal resistance of plate glass and the thermal conductivity in architecture” JIS R 3107: 1998, the thermal conductivity calculated in accordance with JIS R 3107: 1998 is 3 .50 W / m ² · K or less, and passed the sound insulation class T-3 according to “Sash” JIS A4706: 2000, excellent in heat insulation performance and sound insulation performance, and combined the glass plate part and the hollow layer part. A multilayer glass having a total thickness of 25.0 mm or less was obtained.

Furthermore, in the present invention, a double-glazed glass having two hollow layers by separating three glass plates from each other, air is sealed in one of the two hollow layers, and helium is sealed in the other, thereby forming the double-glazed glass. The thickness of the two glass plates on both sides and the thickness of the two hollow layers are symmetrical with respect to the inner glass plate, and the thickness of the inner glass plate and the two glass plates on both sides are different. The total thickness is 18.0 mm or more and 25.0 mm or less, and the thermal conductivity is 3.50 W / m ² · K or less. When the sash is used, the sound insulation grade T-3 grade according to JIS A4706: 2000 It is said multilayer glass characterized by passing.

Furthermore, in the present invention, a double-glazed glass having two hollow layers by separating three glass plates from each other, air is sealed in one of the two hollow layers, and helium is sealed in the other, thereby forming the double-glazed glass. The thickness of the two glass plates on both sides and the thickness of the two hollow layers are symmetrical with respect to the inner glass plate, and the thickness of the two glass plates on both sides and the inner glass plate are different by 2.0 mm or more, The total thickness of the internal glass plate and the two glass plates on both sides is 12.0 mm or more and 17.0 mm or less, the thickness of the hollow layer is 3.0 mm or more and 4.0 mm or less, the glass plate and the hollow layer The total thickness of the multi-layer glass combined with the above is 18.0 mm or more and 25.0 mm or less, the thermal conductivity is 3.50 W / m ² · K or less, and conforms to JIS A4706: 2000 when used as a sash. Passing sound insulation grade T-3 grade That is a double-glazing above.

  Further, in the multilayer glass of the present invention, compared to the case where the two glass plates on both sides are thinner than the inner glass plate, the glass plate on both sides is thicker than the inner glass plate, which is less than 1000 Hz. In the frequency range, sound transmission loss is large and sound insulation is excellent.

  Furthermore, the present invention is the above-mentioned double glazing characterized in that the two glass plates on both sides are thicker than the glass plate inside.

Further, by using Low-E glass coated with a low radiation film that suppresses heat transfer on the surface, the thermal conductivity of the multilayer glass of the present invention is further reduced to 3.00 W / m ² · K or less. It becomes possible. The low-emission film is a metal thin film including a metal oxide thin film such as silver or tin oxide, or a multilayer film thereof. Low-E glass is obtained by forming a low-emission film on the glass surface with a sputtering apparatus or the like. It is done. Low-E glass suppresses heat transfer. Usually, when Low-E glass is used for the multilayer glass, the low radiation film is disposed on the hollow layer side in order to prevent the low radiation film from being scratched and to prevent alteration such as corrosion.

  Further, the present invention is the above multi-layer glass, characterized in that Low-E glass having a low radiation film provided on the surface of at least one glass plate is used, and the low radiation film is disposed on the hollow layer side. It is.

  Furthermore, this invention is a window characterized by attaching said multilayer glass.

  Furthermore, the present invention is a door characterized in that the above-mentioned multilayer glass is attached.

With the multilayer glass of the present invention, the total thickness of the glass plate portion and the hollow layer portion is 25.0 mm or less, the thermal conductivity is 3.50 W / m ² · K or less, and the sash is used as a sound insulation. A multilayer glass excellent in heat insulation performance and sound insulation performance that satisfies the grade T-3 and has a simple structure and easy production.

  Moreover, the multilayer glass of this invention was provided with the multilayer glass which was further excellent in the heat insulation performance by using Low-E glass.

  In FIG. 1, the partial expanded sectional view of an example of the multilayer glass of this invention is shown.

  As shown in FIG. 1, the multi-layer glass of the present invention is a multi-layer glass comprising three glass plates having two hollow layers 1 and 2, with three glass plates G1, G2 and G3 spaced apart from each other. One of the gases enclosed in the two hollow layers 1 and 2 is air, and the other is helium.

  Further, in the double-glazed glass of the present invention, the thickness of the two glass plates G1 and G3 on both sides constituting the double-glazed glass and the thickness of the two hollow layers 1 and 2 are equally symmetric as viewed from the internal glass plate G2. Structure. Note that the thicker the two glasses G1 and G3 on both sides than the inner glass G2, the better the sound insulation performance.

  In addition, if the sound absorption and reflection in the hollow layers 1 and 2 are not taken into consideration, the sound insulation performance on the lower frequency side than the coincidence limit frequency, which is not affected by the coincidence effect in the double layer glass, constitutes the double layer glass according to the mass law. This is determined by the total thickness of the glass plates G1, G2, and G3. That is, in the multilayer glass shown in FIG. 1, the sound insulation performance on the lower frequency side than the coincidence limit frequency that is not affected by the coincidence area is determined by the total thickness of the glass plates G1, G2, and G3 constituting the multilayer glass.

  In addition, in the multilayer glass shown in FIG. 1, if the thickness of the glass plates G1, G2, and G3 constituting the multilayer glass is changed and the coincidence limit frequency is set to a different frequency, the sound insulation performance is reduced due to the coincidence effect. It becomes possible to cancel each other. That is, in the multi-layer glass of the present invention, the glass plate G1 constituting the multi-layer glass is formed by adopting a different thickness structure in which the thicknesses of the two glass G1 and G3 on both sides are different from the thickness of the internal glass plate G2. If the coincidence limit frequencies of G3 and glass plate G2 are set to different frequencies, the drop in the sound insulation performance curve due to the coincidence effect can be eliminated, and the sound insulation performance is improved.

  In the present invention, in consideration of this, in order to prevent the sound insulation performance from deteriorating due to the occurrence of the coincidence effect, in the double glazing using the three glass plates G1, G2, G3, the glass plates G1 on both sides are arranged. G3 and the internal glass plate G2 have different thickness structures.

In the present invention, the heat transmissivity is 3.50 W / m ² · K or less, and in order to pass the sound insulation class T-3 according to JIS A4706: 2000 when the sash is used, the sound insulation is caused by the occurrence of the coincidence effect. In order to prevent the performance from deteriorating, in the multilayer glass using the three glass plates G1, G2, and G3, in detail, the three glass plates G1, G2, and G3 are spaced apart from each other, In the double-glazed glass of the present invention having the hollow layers 1 and 2, air and helium are sealed in the two hollow layers 1 and 2 as different kinds of gases, and the glass plates G1 and G3 on both sides and the inner glass plate G2 The total thickness is 12.0 mm or more and 17.0 mm or less, and the glass plates G1 and G3 on both sides are different in thickness from the inner glass plate G2 by 2.0 mm or more. Each 3.0 m or more, and 4.0mm or less, 3 glass plate G1, G2, G3 and the total thickness of the double glazing the combined hollow layers 1 and 2 18.0mm above was less 25.0 mm.

The total thickness of the glass plates G1, G3 on both sides and the internal glass plate G2 is less than 12.0 mm, the difference in thickness between the glass plates G1, G3 on both sides and the internal glass plate G2 is less than 2.0 mm, empty layer The thickness of 1 and 2 is less than 3.0 mm each, and the sash is formed when the total thickness of the multilayer glass including the three glass plates G1, G2 and G3 and the hollow layers 1 and 2 is less than 18.0 mm. At that time, it is difficult to satisfy both the heat transmissivity of 3.50 W / m ² · K or less and the sound insulation grade T-3 that conforms to JIS A4706: 2000.

  If the total thickness of the internal glass plate G2 and the glass plates G1 and G3 on both sides is larger than 17.0 mm and the thickness of the empty layers 1 and 2 is larger than 4.0 mm, the three glass plates G1 , G2, G3 and the total thickness of the double-glazed glass including the hollow layers 1 and 2 is greater than 25.0 mm.

  At this time, compared to the case where the glass plates G1 and G3 on both sides are thinner than the inner glass plate G2, the glass plates G1 and G3 on both sides are thicker than the inner glass plate G2, in a low frequency band of 1000 Hz or less. Sound transmission loss is large and sound insulation is excellent.

  In addition, the multi-layer glass having a three-layer structure has a large number of interfaces 3 and has an effect of suppressing heat transfer due to sunlight radiation or the like from the heat ray reflection at the interface 3 and the heat ray reflection at the incident surface 4. .

  Moreover, the edge part of the multilayer glass of this invention is made from aluminum which has the hollow part filled with the zeolite etc. as the desiccant 5 between the three glass plates G1, G2, and G3, as shown in FIG. Alternatively, a spacer 6 made of stainless steel or the like is sandwiched, a butyl rubber adhesive 7 is attached to both sides of the spacer 6, and the three glasses G 1, G 2, G 3 are bonded and integrated with the butyl rubber adhesive 7 through the spacer 6, It has hollow layers 1 and 2 that are sealed with three glasses G1, G2, and G3 spaced apart. The recess 8 surrounded by the three glasses G1, G2, G3 and the spacer 6 is filled with a silicone sealant or a polysulfide sealant to improve water tightness so that moisture does not enter.

  In the sound insulating double-glazed glass of the present invention, in order to prevent the air or helium enclosed in the hollow layers 1 and 2 from escaping, in particular, in order to prevent the helium enclosed in either of the hollow layers 1 and 2 from escaping, It is preferable to fill with a polysulfide sealant that is hard to permeate helium and has higher sealing performance than helium. Helium is most difficult to permeate when the recess 8 is filled with hot melt butyl. Moreover, it is good also as a double structure of a polysulfide sealant and a silicone sealant. At this time, in order to prevent helium leakage from the edge of the multi-layer glass, it is preferable that the depth of the recess 8 is 5 mm or more, and the thickness of the spacer and the sealant layer is 10 mm or more.

  Further, in the double glazing of the present invention having two hollow layers 1 and 2 with three glass plates spaced apart from each other, the thickness of the three glass plates G1, G2, and G3 constituting the double glazing is determined. Using different spacers 6 having different thicknesses and different thicknesses of the hollow layers 1 and 2 makes it difficult to procure materials and is difficult to manufacture.

  Therefore, in the double glazing of the present invention, in order to obtain a simpler structure, the thickness of the two glass plates G1 and G3 on both sides and the thickness of the two hollow layers 1 and 2 are determined from the inner glass plate G2. It is preferable to have a structure that is equally symmetric. By making the symmetrical structure, it becomes easy to procure and produce a material of the double-glazed glass.

  Further, in the double glazing of the present invention, the thicknesses of the two glass plates G1 and G3 on both sides constituting the double glazing and the thicknesses of the two hollow layers 1 and 2 are equally symmetric when viewed from the internal glass plate G2. In this structure, air and helium having different mass per unit volume at the same temperature and pressure are enclosed in two hollow layers 1 and 2, respectively, so that the acoustic transmission becomes asymmetric and resonance transmission is reduced. Suppressed.

  In order to keep the thermal conductivity of the multilayer glass of the present invention low, argon (atomic weight, about 40 amu), krypton (atomic weight, about 84 amu), which is a heavy gas that hardly transmits heat to any one of the hollow layers 1 and 2, Although it is conceivable to enclose xenon (atomic weight, about 131 amu), these rare gases are expensive. Air (average molecular weight, 29 g / mol) can be easily obtained in order to enclose in any one of the hollow layers 1 and 2 of the multilayer glass of the present invention, and is preferably used for the multilayer glass of the present invention.

  In addition, in order to obtain a sound insulation performance excellent in a sash using the multilayer glass of the present invention, sound, which is a dense wave obtained by vibrating through air, glass, etc., is absorbed and attenuated, and a coincidence effect, resonance Resonance must be suppressed. For this purpose, for example, helium is sealed in either one of the hollow layers 1 and 2 of the double-glazed glass, and the sound is attenuated and absorbed by dissipating the vibration energy of sound as thermal energy instead of the atomic kinetic energy of helium.

At room temperature (20 ° C.), the elastic modulus of the glass is 60 to 80 × 10 ⁹ Pa, the density is about 2200 to 2600 kg / m ³ , and the speed of sound in the glass is 4000 to 5500 m / s. The elastic modulus of air is 14 × 10 ⁴ Pa, the density is about 1.2 kg / m ³ , and the speed of sound in the air is 341 m / s. The elastic modulus of helium is 17 × 10 ⁴ Pa, the density is about 0.18 kg / m ³ , and the speed of sound in helium is 970 m / s. Helium has a density lower than that of air, but has the same elastic modulus. Sound is reflected more on the glass surface due to the density difference from glass, and the reflected sound is helium molecules (monoatomic molecules). Absorbed as thermal energy of molecules. Note that the sound is transmitted more quickly as the medium is harder, in other words, the greater is the elastic modulus, which is a measure of hardness, and the lighter, in other words, the smaller the density. The speed of sound is expressed by the equation (2).

  In this way, helium is more easily moved by sound energy and has a great effect of converting sound energy into heat energy. Therefore, when helium is enclosed in one of the hollow layers 1 and 2 of the multilayer glass of the present invention. When the sash is used, the sound transmission loss is increased, and the sound insulation performance is improved.

That is, in the above-described configuration of the multilayer glass of the present invention, air is sealed in one of the hollow layers 1 and 2, helium is sealed in the other, and the thickness of the hollow layers 1 and 2 is 3.0 mm or more. By setting the thickness to 4.0 mm or less, “the calculation method of the thermal resistance of sheet glass and the thermal flow rate in architecture” JIS R 3107: 1998, the thermal flow rate of the multi-layer glass is 3.50 W / m ² · K. A multi-layer glass that passed the sound insulation class T-3 according to “Sash” JIS A4706: 2000 was obtained.

If the thickness of the hollow layers 1 and 2 is less than 3.0 mm, it is difficult to achieve a thermal conductivity of 3.50 W / m ² · K or less and a sound insulation rating T-3. Preferably, it is 3.5 mm or more. Considering that the thickness of the multilayer glass is suppressed to 25.0 mm or less that can be mounted on a commercially available sash frame, the thickness of the hollow layers 1 and 2 is preferably 4.0 mm or less.

Further, as described above, by using Low-E glass coated with a low radiation film that suppresses heat transfer on at least one of the three glass plates constituting the multilayer glass of the present invention, Specifically, by coating at least one of the interfaces 3 shown in FIG. 1 with a low radiation film that suppresses heat transfer, the thermal conductivity of the multilayer glass of the present invention is further reduced to 2.50 W / m ^2. -It becomes possible to set it as K or more and 3.00 W / m < ² > * K or less.

  In addition, the double-glazed glass is usually attached to a sash frame that has been produced and adjusted in advance for direct attachment or fitting to a door and window sash, either directly or via a frame that is an attachment member such as a glazing channel, and fixed. When installing to windows such as windows and movable windows, and doors such as opening and closing doors, they are handled as a single component.

  The glass plates G1, G2, and G3 used for the multilayer glass of the present invention are prepared by a float method or the like, and are not subjected to any post-treatment. A tempered glass or the like made of is used, and a colored glass may be used.

(Evaluation of optical and thermal performance)
“Testing method of transmittance, reflectance, emissivity, and solar radiation acquisition rate of plate glass” JIS R 3106: 1998 was used to measure the optical properties and thermal performance of the multi-layer glass of the present invention. Calculation method of heat transmissivity in resistance and building "The heat transmissivity was calculated based on JIS R 3107: 1998.

  In addition, as shown in FIG. 1, the end surface of the multilayer glass sandwiches an aluminum spacer 6 having a hollow portion filled with zeolite as a desiccant 5 between glass plates G1, G2, and G3. The butyl rubber adhesive 7 was stuck on both sides of the glass plate, and the glass plates G1, G2, and G3 were bonded and integrated with the butyl rubber adhesive 7 through the spacer 6 to separate the glass plates G1, G2, and G3. In addition, the polysulfide sealant was filled in the concave portion 8 having a depth of 7 mm surrounded by the single plate glasses G1, G2, and G3 and the spacer 6. Air was enclosed in the hollow layer 1 at atmospheric pressure, and helium was enclosed in the hollow layer 2 at atmospheric pressure.

  First, a glass plate G1 (FL6) having a measured thickness value of 5.7 mm + an air-filled hollow layer 1 (A4) having a thickness of 4.0 mm + a glass plate G2 (FL4 having a measured thickness value of 3.7 mm). ) + Helium-filled hollow layer 2 (He4) with a thickness of 4.0 mm + A double-layer glass with a total thickness of 23.1 mm having a measured value of 5.7 mm glass plate G3 (FL6), that is, FL6 + A4 + FL4 + He4 + FL6 (total The optical properties and thermal performance of the multilayer glass of the present invention having a thickness of 23.1 mm were measured.

  Next, the optical characteristics and thermal performance of the multilayer glass of the present invention having the same structure and having the internal glass plate G2 replaced with Low-E glass were also measured.

  As the Low-E glass having a thickness of 4 mm, the product name Twin Guard E (LEP FL4) or the product name Twin Guard S (SLEP FL4) manufactured by Central Glass Co., Ltd. was used. That is, FL6 (actual value of thickness 5.7 mm) + A4 (air-filled hollow layer with a thickness of 4.0 mm) + LEP FL4 (actual value of thickness 3.7 mm) + He4 (helium-filled hollow layer with a thickness of 4.0 mm) ) + FL6 (actual thickness measurement value 5.7 mm) FL6 + A4 + LEP FL4 + He4 + FL6 double-layer glass with a total thickness of 23.1 mm, or FL6 (actual thickness measurement value 5.7 mm) + A4 (thickness 4.0 mm air) Total thickness 23 of FL6 + A4 + SLEP FL4 + He4 + FL6 having a configuration of (encapsulated hollow layer) + SLEP FL4 (actual thickness measurement value 3.7 mm) + He4 (helium inclusion hollow layer with a thickness of 4.0 mm) + FL6 (actual thickness measurement value 5.7 mm) .1 mm multi-layer glass.

  The abbreviation FL stands for float glass which is continuously produced by melting and developing a glass raw material on a tin bath. The numerical value after the abbreviation is the nominal thickness, and the unit is mm. The nominal thickness is the tolerance shown in Table 1 according to JIS R 3202-1996. For the examples, a glass plate having a lower limit thickness was used in terms of tolerance. For example, FL6 plate glass is a measured glass plate of 5.7 mm, FL5 plate glass is a measured glass plate of 4.7 mm, FL4 plate glass is a measured glass plate of 3.7 mm, and FL3 plate glass is a measured glass plate of 2.7 mm. used.

  Table 2 shows the measurement results of optical characteristics and thermal performance.

  The abbreviation A in the product type / configuration means air, the abbreviation He means helium, and the subsequent numerical values represent the thickness of the hollow layer, and the unit is mm.

As shown in Table 2, FL6 (actual value of thickness 5.7 mm) + A4 (air-filled hollow layer with a thickness of 4.0 mm) + FL4 (actual value of thickness 3.7 mm) + He4 (with a thickness of 4.0 mm) Helium-filled hollow layer) + FL6 (actual thickness measurement value 5.7 mm), and the calculated heat transmissivity for a multi-layer glass of FL6 + A4 + FL4 + He4 + FL6 with a total thickness of 23.1 mm is 3.18 W / m ² · K It was a low value.

The heat transmissivity calculated for the multi-layer glass having the configuration of FL6 + A4 + LEP FL4 + He4 + FL6 in which the internal glass plate G2 was replaced with Twin-Guard E which is Low-E glass was 2.76 W / m ² , which was a low value. The heat transmissivity of the multi-layer glass of FL6 + A4 + SLEP FL4 + He4 + FL6 (total thickness: 23.1 mm) obtained by replacing the internal glass plate G2 with the twin guard S, which is Low-E glass, is an even lower value of 2.73 W / m ^2. K.

  As shown in Table 2, the visible light transmittance is 72.6% when Low-E glass is not used, 61.8% when Twin Guard E (LEPFL4) is used, and Twin Guard S (SLEPFL4) is used. To 61.1%. However, the solar radiation transmittance is 56.6% when Low-E glass is not used, 38.5% when Twin Guard E (LEP FL4) is used, and 30.2% when Twin Guard S (SLEP FL4) is used. %, And the use of Low-E glass provides good heat shielding performance.

  Next, FL5 (actual value of thickness 4.7 mm) + A4 (air-filled hollow layer with a thickness of 4.0 mm) + FL3 (actual value of thickness 2.7 mm) + He4 (helium-filled hollow layer with a thickness of 4.0 mm) FL5 + A4 + FL3 + He4 + FL5 double-glazed glass with a composition of + FL5 (actual thickness value 4.7 mm), and FL4 (actual thickness value 3.7 mm) + A4 (thickness 4.0 mm air) The total thickness of FL4 + A4 + FL6 + He4 + FL4 is 21. The total thickness of FL4 + A4 + FL6 + He4 + FL4 is comprised of: (enclosed hollow layer) + FL6 (actual thickness measured 5.7 mm) + He4 (helium sealed hollow layer with a thickness of 4.0 mm) + FL4 The heat transmissivity was calculated for a 1 mm multilayer glass.

FL5 (actual value of thickness 4.7 mm) + A4 (air-filled hollow layer with a thickness of 4.0 mm) + FL3 (actual value of thickness 2.7 mm) + He4 (helium-filled hollow layer with a thickness of 4.0 mm) + FL5 ( The heat transmissivity calculated for the multi-layer glass having a total thickness of 20.1 mm of FL5 + A4 + FL3 + He4 + FL5 having a configuration of the actual thickness (4.7 mm) was 3.21 W / m ² · K, which was a low value.

FL4 (actual thickness 3.7 mm) + A4 (4.0 mm thick air-filled hollow layer) + FL6 (thickness measured 5.7 mm) + He4 (4.0 mm thick helium-filled hollow layer) + FL4 ( The heat transmissivity calculated for the multi-layer glass with a total thickness of 21.1 mm of FL4 + A4 + FL6 + He4 + FL4 having a configuration of 3.7 mm (actual thickness measurement value) was 3.20 W / m ² · K, which was a low value.

  Next, in Table 3, a double-glazed glass in which air is sealed in one of the hollow layers 1 and 2 of the double-glazed glass and helium is sealed in the other, a double-glazed glass in which both the hollow layers 1 and 2 are filled with air, The measured value of the thermal performance of the multilayer glass which put helium in both the hollow layers 1 and 2 is shown.

As shown in Table 3, air is enclosed in one of the hollow layers 1 and 2 of the double-glazed glass shown in FIG. When heat is added, the thermal conductivity is lower and the thermal performance is improved. When helium is added to both the hollow layers 1 and 2, the thermal conductivity is higher and the thermal performance is reduced. .
(Measurement of sound insulation performance)
Next, in accordance with “Sash” JIS A4706: 2000, a sound insulation performance test according to “Method of measuring sound transmission loss in a laboratory” JIS A 1416 was performed. At that time, the sound transmission loss at the center frequency of 1/3 octave was measured based on the JIS. In the measurement, the sound source was placed on the glass plate G1 side, and the measuring instrument was placed on the glass plate G3 side.

  The sound insulation grade described in "Sash" JIS A4706: 2000, "Measurement method of sound transmission loss in the laboratory" JIS A1416: 2000 measurement method will be described.

  FIG. 2 shows a graph of the sound insulation grade line described in JIS A4706: 2000.

In JIS A4706: 2000, when it conforms to either of the following a) or b), it is a grade represented by the grade line shown in FIG.
a) It is assumed that the sound transmission loss at 16 points of 125 Hz to 4000 Hz exceeds all the sound insulation rating lines. In addition, when the sum of the values below the corresponding sound insulation grade line in each frequency band is 3 dB or less, the sound insulation grade is assumed.
b) In all frequency bands, the sound transmission loss is converted by the formula (3), and the converted value (six points) exceeds the corresponding sound insulation grade line.

  However, 125 Hz is converted to 160 Hz, and 4000 Hz is converted to 3150 Hz. The converted value is rounded to an integer, and if the sum of values below the corresponding sound insulation grade line in each frequency band of the converted value is 3 dB or less, the sound insulation grade is assumed.

As shown in FIG. 2, in the sound insulation grade line due to sound transmission loss, the sound insulation performance of 500 Hz or more, the sound insulation grade T-3 grade is 35 dB or more, and the sound insulation grade T-4 grade is 40 dB or more. To pass the sound insulation class T-3. The sound transmission loss needs to be substantially higher than the aforementioned grading line. The decibel (dB) is a unit of the sound pressure level, and the sound pressure level is expressed as a non-dimensional amount that represents a pressure variation logarithmically from the atmospheric pressure due to the sound and expressed in decibel (dB). The pressure fluctuation fluctuates 3.2 times at a sound pressure level of 10 dB. The sound pressure level is defined as 20 times the common logarithm of the ratio of the sound pressure P (unit: Pa) of a certain sound to the reference sound pressure P0 (2 × 10 ⁻⁵ Pa) which is the minimum human audible sound, It is expressed in dB.

  In accordance with “Sash” JIS A4706: 2000, “Method for measuring sound transmission loss in the laboratory” JIS A 1416: 2000, and the effect of improving the sound insulation performance by enclosing helium in the hollow layer of double-glazed glass Evaluated. The sound insulation test was conducted in accordance with JIS A 1416: 2000. Specifically, using a type I test chamber (reverberation chamber) described in JIS A 1416: 2000, using two wooden pressing edges (25 mm × 25 mm), a multi-layer glass test piece is fixed, Glass was installed and the sound transmission loss was measured by the method described in JIS A 1416: 2000. The measured sound transmission loss is determined based on the above-mentioned JIS A4706: 2000, “a) the sound transmission loss at 16 points of 125 Hz to 4000 Hz all exceeds the corresponding sound insulation grade line. If the sum of the values below the applicable sound insulation grade line in the frequency band is 3 dB or less, the sound insulation grade is used. ”“ B) In all frequency bands, the sound transmission loss is converted by the formula (1), and the conversion is made. If the value (6 points) exceeds the corresponding sound insulation grade line, ”the sound insulation grade T-3 grade, if any of the criteria a) and b) is met, the sound insulation grade T-3 grade I decided to pass.

  In this way, first, the sound insulation performance of the multilayer glass of the present invention having a total thickness of 23.1 mm having a configuration of FL6 + A4 + FL4 + He4 + FL6 was measured. Next, the sound insulation performance of the multilayer glass of the present invention of FL5 + A4 + FL3 + He4 + FL5 (total thickness, 20.1 mm) and the multilayer glass of the present invention of FL4 + A4 + FL6 + He4 + FL4 (total thickness, 21.1 mm) was measured. Table 4 shows the measured sound insulation performance. The size of each measured double glazing is 1230 mm × 1480 mm, which is the same size.

  Although not shown in Table 4, FL6 + A4 + LEP FL4 + He4 + FL6 (total thickness, 23.1 mm) and FL6 + A4 + SLEP FL4 + He4 + FL6 (total thickness, 23.1 mm) using Low-E glass for the inner glass plate G2 Since only a metal thin film as a low radiation film was formed on the surface, there was no acoustic attenuation effect, and the measured sound insulation performance was the same as that of FL6 + A4 + FL4 + He4 + FL6.

  Subsequently, the measurement result of the sound insulation performance of each double-glazed glass shown in Table 4 was made into the graph of the sound insulation performance curve.

  FIG. 3 is a graph of a sound insulation performance curve of a double-glazed glass having a configuration of FL6 + A4 + FL4 + He4 + FL6 (total thickness, 23.1 mm).

  As shown in the graph of FIG. 3, the sound insulation performance curve of the multi-layer glass of the present invention having a configuration of FL6 + A4 + FL4 + He4 + FL6 (total thickness, 23.1 mm) exceeds the T-3 rating line, and FL6 + A4 + FL4 + He4 + FL6 (total thickness, 23.1 mm). The multilayer glass of the present invention has been shown to pass the sound insulation grade T-3. This is due to the fact that helium is sealed in the hollow layer 2.

  FIG. 4 is a graph of a sound insulation performance curve of a multi-layer glass having a configuration of FL5 + A4 + FL3 + He4 + FL5 (total thickness, 20.1 mm).

  As shown in the graph of FIG. 4, the sound insulation performance curve of the multi-layer glass of the present invention having a configuration of FL5 + A4 + FL3 + He4 + FL5 (total thickness, 20.1 mm) exceeds the T-3 rating line, and is FL5 + A4 + FL3 + He4 + FL5 (total thickness, 20.1 mm). It was shown that the multilayer glass of the present invention passed the sound insulation T-3 grade. This is due to the fact that helium is sealed in the hollow layer 2.

  FIG. 5 is a graph of a sound insulation performance curve of a double-layer glass having a configuration of FL4 + A4 + FL6 + He4 + FL4 (total thickness, 21.1 mm).

  As shown in the graph of FIG. 5, the sound insulation performance curve of the multi-layer glass having the structure of FL4 + A4 + FL6 + He4 + FL4 (total thickness, 21.1 mm) is below the T-3 grade line and indicates that the sound insulation grade T-3 is not passed. .

  In this case, when the glass plates G1 and G3 on both sides are thinner than the inner glass plate G2, that is, compared with FL4 + A4 + FL6 + He4 + FL4 (total thickness, 21.1 mm), the glass plates G1 and G3 on both sides are inside. In the case where it is thicker than the glass plate G2, that is, FL5 + A4 + FL3 + He4 + FL5 (total thickness, 20.1 mm) has a larger sound transmission loss and excellent sound insulation in a low frequency region of 1000 Hz or less.

The partial expanded sectional view of an example of the multilayer glass of this invention is shown. It is a graph of the sound-insulation grade line described in JIS A4706: 2000. It is a graph of the sound insulation performance curve of the multilayer glass of a structure of FL6 + A4 + FL4 + He4 + FL6 (total thickness, 23.1 mm). It is a graph of the sound insulation performance curve of the multilayer glass of a structure of FL5 + A4 + FL3 + He4 + FL5 (total thickness, 20.1 mm). It is a graph of the sound insulation performance curve of the double glazing of the structure of FL4 + A4 + FL6 + He4 + FL4 (total thickness, 21.1 mm).

G1, G2, G3 Glass plates 1, 2 Hollow layer 3 Interface 4 Incident surface 5 Desiccant 6 Spacer 7 Butyl rubber adhesive 8 Recess

Claims (8)

A multilayer glass having two hollow layers with three glass plates spaced apart from each other, wherein one of the two hollow layers is filled with air and the other is sealed with helium. The thickness of the two glass plates on both sides constituting the double-glazed glass and the thickness of the two hollow layers are symmetrical with respect to the inner glass plate, and the thicknesses of the two glass plates on both sides and the inner glass plate are different. The multilayer glass according to claim 1. In a double-glazed glass having two hollow layers with three glass plates spaced apart from each other, two glasses on both sides constituting the double-glazed glass are formed by enclosing air in one of the two hollow layers and helium in the other. The thickness of the plate and the thickness of the two hollow layers are symmetrical with respect to the inner glass plate, the thickness of the two glass plates on both sides and the thickness of the inner glass plate are different, and the total thickness of the multilayer glass is 18.0 mm. Above, it is 25.0 mm or less, thermal conductivity is 3.50 W / m ² · K or less, and when it is made a sash, it passes the sound insulation grade T-3 grade based on JIS A4706: 2000. The multilayer glass according to claim 1 or 2. In a double-layer glass having two hollow layers with three glass plates spaced from each other, air on one side of the two hollow layers and helium on the other side, and two glass sheets on both sides constituting the double-layer glass The thickness of the plate and the thickness of the two hollow layers are symmetrical with respect to the inner glass plate, the thickness of the two glass plates on both sides and the thickness of the inner glass plate differ by 2.0 mm or more, and the inner glass plate and both sides Multi-layer glass in which the total thickness of the two glass plates is 12.0 mm or more and 17.0 mm or less, the thickness of the hollow layer is 3.0 mm or more and 4.0 mm or less, and the glass plate and the hollow layer are combined. The total thickness of the material is 18.0 mm or more and 25.0 mm or less, the thermal conductivity is 3.50 W / m ² · K or less, and the sound insulation grade T-3 conforming to JIS A4706: 2000 when sash is used. Passing grade, claim 1 to claim Double glazing according to any one of claim 3. 5. The multilayer glass according to claim 1, wherein the two glass plates on both sides are thicker than the inner glass plate. The low radiation film is disposed on the hollow layer side using Low-E glass having a low radiation film on the surface of at least one glass plate. The multilayer glass as described in the item. A window comprising the double-glazed glass according to any one of claims 1 to 6. A door to which the multilayer glass according to any one of claims 1 to 6 is attached.