JP2017077985A - Bilayer glass structure for refrigeration show case and refrigeration show case - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bilayer glass structure for a refrigeration show case which is lighter than conventional ones, and which allows even a user whose force is weak, such as an old person or a child, to easily handle the bilayer glass structure, and a refrigeration show case.SOLUTION: A bilayer glass structure for a refrigeration show case comprises a first glass plate which is positioned on the interior side of a refrigeration show case, and a second glass plate which is positioned on the exterior side and faces the first glass plate with a prescribed space, in which peripheral edge parts of the first and second glass plates are held through a spacer, for forming an integral structure. A surface on the interior side of the first glass plate has a first antifogging layer provided thereon, and a surface on the exterior side of the first glass plate has a first low radiation film provided thereon. A surface on the interior side of the second glass plate has a transparent film containing an oxidized metal provided thereon, and the space is filled with heat insulation gas.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a multi-layer glass structure and a cold insulation showcase.

  Conventionally, convenience stores and the like store and sell various products (ice, frozen food, etc.) in a frozen showcase. The frozen showcase is provided with a door made of a sash and a glass plate on the front, and a handle is attached to the front of the sash. The user can open and close the door back and forth by opening and closing the handle. Moreover, since the door is generally made of glass except for the peripheral sash, the user can identify and select the product in the store without opening the door. For this reason, the occurrence of fogging on the glass surface due to condensation when the door is opened and closed is a major obstacle to sales promotion.

  In order to prevent fogging due to condensation on the glass surface of the door of the frozen showcase, as a double-layer glass structure used for the frozen showcase, for example, a first glass plate located inside the refrigerator showcase A second glass plate facing the first glass plate across a predetermined space and positioned outside the warehouse; and a second glass plate facing the second glass plate across a predetermined space and positioned further outside the warehouse A multi-layer comprising a third glass plate, a low radiation film added to at least one of the first glass plate and the second glass plate, and a conductive film added to the inner surface of the third glass plate A glass structure or the like is known (for example, see Patent Document 1).

JP 2011-084460 A

  However, the multi-layer glass structure of Patent Document 1 has a thickness of 2.5 to 5 mm as the first, second, and third glass plates. There was a problem that the case door was heavy and difficult to handle.

  Therefore, the present invention is lighter than before, easy to handle even for relatively weak users such as elderly people and children, and prevents condensation and icing on the glass surface of the door of the frozen showcase, thereby allowing visual recognition of products in the warehouse. It is an object of the present invention to provide a multilayer glass structure for a frozen showcase that can maintain the properties, and a frozen showcase.

  To achieve the above object, a multilayer glass structure for a refrigerated showcase according to the present invention has a first glass plate located inside the refrigerator showcase and a predetermined space separated from the first glass plate. And a second glass plate that is opposed to each other and located outside the warehouse, and a peripheral glass plate holding the peripheral portions of the first and second glass plates via a spacer to form an integral structure. A first anti-fogging layer is provided on the inner surface of the first glass plate, and a first low radiation film is provided on the outer surface of the first glass plate. A transparent film containing metal oxide is provided on the inner surface of the second glass plate, and the space is filled with a heat insulating gas.

  According to the present invention, it is lighter than before, easy to handle even for users with relatively weak power, such as elderly people and children, and prevents condensation and icing on the glass surface of the door of the frozen showcase. A multilayer glass structure for a frozen showcase capable of maintaining visibility and a frozen showcase can be provided.

It is sectional drawing which shows 1st Embodiment of the multilayer glass structure for frozen showcases of this invention. It is sectional drawing which shows 2nd Embodiment of the multilayer glass structure for frozen showcases of this invention. It is sectional drawing which shows 3rd Embodiment of the multilayer glass structure for frozen showcases of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

A multilayer glass structure 100 for a frozen showcase shown in FIG. 1 is a first embodiment of a multilayer glass structure used for a door of a frozen showcase.
Here, the frozen showcase is a showcase for storing frozen foods and the like, and refers to a showcase in which the temperature inside the cabinet is kept at -18 ° C or lower.

  The multilayer glass structure 100 for a frozen showcase is opposed to the first glass plate 11 located inside the freezer showcase, the first glass plate 11 with a predetermined space 18, and located outside the warehouse. The second glass plate 12 and the peripheral edge portions of the first and second glass plates are integrally formed by being held via the spacer 13.

Although the thickness of the 1st, 2nd glass plates 11 and 12 does not have limitation in particular, 1-5 mm with a track record of use as a window is preferable. You may apply a tempered glass and a laminated glass to 1 sheet or 2 sheets as needed.
In the present invention, glass includes both inorganic glass and organic glass. Organic glass refers to a transparent resin such as acrylic.

  The space 18 between the first glass plate 11 and the second glass plate 12 has a different heat insulation effect depending on the gas that fills the space 18, but the thickness of the space 18 is 8 from the point of fit as a door of the cold insulation showcase. It is preferably ~ 20 mm.

  The space 18 is preferably filled with a heat insulating gas. The heat insulating gas means a gas having a thermal conductivity smaller than that of air, and krypton (Kr) gas and argon (Ar) gas, which are rare gases, are preferable. The higher the concentration of the rare gas in the heat insulating gas, the better. If the thermal conductivity is smaller than air, a mixed gas of air and rare gas may be used.

  When the insulating gas is krypton, the thickness of the space 18 is preferably 8 to 12 mm, and when the insulating gas is argon, the thickness of the space 18 is preferably 14 to 20 mm.

  The spacer 13 has a function of maintaining the distance between the glass plates, a function of adhering the glass plates, and a function of sealing the inside of the air layer. In particular, the spacer 13 is a main member having a function of maintaining the distance between the glass plates. This means that the constituent material is a resin. The main constituent of resin means that a part of metal may be introduced into the resin.

  In the multilayer glass structure 100 for a frozen showcase, a first antifogging layer 14 is provided on the inner surface of the first glass plate 11. The first antifogging layer has a function of preventing condensation and icing on the glass surface.

  Here, a method for forming the first antifogging layer 14 will be described. A chemical solution obtained by dissolving a solid content having an antifogging function in a solvent is applied to a glass plate (first glass plate 11), and the first volatilization and drying of the solvent causes the first glass plate 11 to have a first surface. The anti-fogging layer 14 is formed. Note that an antifogging resin film obtained by forming the first antifogging layer 14 on a transparent resin film may be bonded to the first glass plate 11.

  The first antifogging layer 14 absorbs moisture in the air and moisture adsorbed on the film surface into the film, thereby inhibiting water droplet formation on the film surface and exhibiting an antifogging function. Even so, it may be either a hydrophilic film that lowers the contact angle of water attached to the film surface to about 10 ° or less and inhibits the formation of water droplets. In the hydrophilic film, the water adsorbed on the surface becomes a film. As a water-absorbing resin film, for example, there is a method in which polyacrylic acid ester and epoxy are dissolved in alcohol, and this is applied to the glass surface and heated and dried.

  Moreover, the formation method of the 1st anti-fogging layer 14 is not restrict | limited to a specific method, A dip coat method, a spray coat method, a spin coat method, a nozzle flow coat method, a brush coating method, those combined use, etc. It can be arbitrarily selected from known coating methods.

Further, the antifogging layer 14 may have an underlayer such as SiO _{2 in} order to increase durability. The underlayer can be formed by applying by wet coating using a sol-gel method, or can be formed by dry coating using a sputtering method or a CVD method.

  The first antifogging layer 14 is preferably completely transparent from the viewpoint of visibility, but may be colored to such an extent that the visibility is not impaired. Furthermore, when sticking the 1st antifogging layer 14 on the 1st glass plate 11 as an antifogging resin film, an adhesive agent can also be used in order to adhere and fix a film to glass. Although the kind of adhesive agent is not specifically limited, From a viewpoint of visibility, it is preferable that it is completely transparent.

  In addition, as the 1st anti-fogging layer 14, the well-known hydrophilic film currently disclosed by Unexamined-Japanese-Patent No. 2005-119920 etc. is applicable.

  In the multilayer glass structure 100 for a frozen showcase, a first low radiation film 16 (Low-E film) is provided on the outer surface of the first glass plate 11. The first low emission film 16 may be a silver low emission film or a non-silver low emission film.

  When the first low-emission film 16 is a silver-based low-emission film, the first low-emission film 16 is formed of a thin film stack, and a film containing silver as a main component is replaced with an oxide containing zinc as a main component. It may be a laminated film sandwiched between thin films (described as zinc oxide / silver / zinc oxide). In order to reduce the low emissivity, a laminate film (zinc oxide / silver / zinc oxide / silver / zinc oxide) in which the laminate is doubled is more preferable. Since this laminated film has high transmittance and low radiation, the inside of the showcase can be easily seen.

  As the first low radiation film 16, for example, a transparent conductive film disclosed in Japanese Patent Publication No. 8-32436 or a heat ray reflective film disclosed in Japanese Patent Laid-Open No. 6-144874 can be applied.

When the first low emission film 16 is a non-silver low emission film, the first low emission film 16 may be mainly composed of tin oxide (SnO ₂ ). When the first low-emission film 16 is non-silver-based, that is, does not contain silver as a main component, the first low-radiation film 16 has a low content of silver as a main component with respect to components such as oxygen and moisture (moisture) in the surrounding air. It is more durable than the radiation film. Further, if the first low radiation film 16 is a low radiation film mainly composed of tin oxide, the first low radiation film 16 is formed on the first glass plate 11 because it is resistant to scratches and has excellent wear resistance. Later, even if the first low radiation film 16 is placed and conveyed so as to be in contact with the roller, the surface is opposite to the first low radiation film 16, that is, the inner surface of the first glass plate 11. Processing, that is, the first anti-fogging layer 14 can be formed, and productivity can be dramatically improved.

  In the multilayer glass structure 100 for a frozen showcase, a transparent film 17 containing metal oxide is provided on the inner surface of the second glass plate 12. Here, the transparent film 17 containing metal oxide may be a second low emission film (Low-E film). When the transparent film 17 containing metal oxide is the second low emission film, the second low emission film may be the same material as the first low emission film 16 or may be a different material.

  For example, in the case of a multilayer glass structure using three glass plates as disclosed in JP 2011-084460 A, when the dimensions of each glass plate are 1549 mm × 684 mm and the thickness is 3 mm, The total weight of the three glass plates is 27.2 kg. If a spacer, a low radiation film, a conductive film, etc. are included, the total weight of the door of the cold insulation showcase is 30.5 kg. However, in the case of the multilayer glass structure 100 for the frozen showcase of the first embodiment, when the dimensions of the first glass plate 11 and the second glass plate 12 are 1549 mm × 684 mm and the thickness is 3 mm, The total weight of the first glass plate 11 and the second glass plate 12 is 18.7 kg, including the spacer 13, the anti-fogging layer 14, the first low radiation film 16, the transparent film 17 containing the second metal oxide, and the like. The total weight of the door of the frozen showcase using the multilayer glass structure 100 for the frozen showcase is 22.0 kg, which is 8 kg or more lighter than the door of the conventional cold showcase.

  Therefore, in the multilayer glass structure 100 for a frozen showcase, the first glass plate 11 located inside the refrigerator showcase is opposed to the first glass plate 11 with a predetermined space therebetween and on the outside of the warehouse. The second glass plate 12 positioned and the peripheral portions of the first and second glass plates 11 and 12 are held via a spacer 13 to form an integrated structure. A first anti-fogging layer is provided on the surface, a first low radiation film 16 is provided on the outer surface of the first glass plate 11, and a metal oxide is contained on the inner surface of the second glass plate. Since the transparent film 17 is provided and the space 18 is filled with a heat insulating gas, it is possible to reduce the weight of the multilayer glass structure 100 for a refrigerated showcase, and it can be handled even by a relatively weak user such as an elderly person or a child. Cheap. Furthermore, even if it is used for a door for a refrigeration showcase having an internal temperature of −18 ° C. or lower, due to the effect of the first low radiation film 16, the transparent film containing metal oxide, and the heat insulating gas filled in the space 18. In addition, while maintaining heat insulation performance, it prevents condensation and icing on the glass surface of the door of the refrigerated showcase, so that the visibility of products in the warehouse can be maintained.

  A multilayer glass structure 101 for a frozen showcase shown in FIG. 2 is a second embodiment of a multilayer glass structure used for a door of a frozen showcase.

  The double-sided glass structure 101 for a refrigerated showcase according to the second embodiment is a surface outside the warehouse of the second glass plate 12 with respect to the double-sided glass structure 100 for a refrigerated showcase according to the first embodiment. The second anti-fogging layer 15 is provided.

  Here, the second anti-fogging layer 15 may be the same material as the first anti-fogging layer 14 or a different material. In addition, when the anti-fogging resin film obtained by forming the second anti-fogging layer 15 on the transparent resin film is bonded to the second glass plate 12, it is used for a freezer showcase by a user or the like outside the warehouse. Even when an impact is applied to the multilayer glass structure 101 and the second glass plate 12 is damaged, glass scattering can be prevented.

  Furthermore, in the multilayer glass structure 101 for a refrigerated showcase that is the second embodiment, the transparent film 17 containing metal oxide is preferably a second low-emission film (Low-E film).

  The transparent film 17 containing metal oxide may be the same material as the first low-emission film 16 or a different material, but the transparent film 17 containing metal oxide is a low Since the radiation film is resistant to scratches and has excellent wear resistance, after the transparent film 17 containing metal oxide is formed on the second glass plate 12, the transparent film 17 containing metal oxide is placed in contact with the roller. Even if transported, the surface treatment, that is, the second antifogging layer 15 can be formed on the opposite surface of the transparent film 17 containing metal oxide, that is, the outer surface of the second glass plate 12. Thus, productivity can be dramatically improved.

  A multilayer glass structure 102 for a frozen showcase shown in FIG. 3 is a third embodiment of a multilayer glass structure used for a door of a frozen showcase.

  In the multilayer glass structure 102 for a frozen showcase shown in FIG. 3, the transparent film containing metal oxide provided on the inner side surface of the second glass plate is the heating means 19.

  When the transparent film containing a metal oxide is the heating means 19, the transparent film containing a metal oxide should just have the function to heat-heat a glass plate. The temperature of the second glass plate 12 is increased by a transparent film containing metal oxide provided on the inner surface of the second glass plate 12, and condensation and icing on the outer surface of the second glass plate 12 are performed. Can be prevented.

  The heating means 19 may be a transparent conductive film. As a material for the transparent conductive film, antimony-doped tin oxide, bismuth-doped tin oxide, or fluorine-doped tin oxide is preferable, and fluorine-doped tin oxide is more preferable in terms of cost.

  The heating means 19 is supplied with power by a power supply means (not shown) through a power transmission means (not shown). Note that the heating means may be always supplied with electric power and in an energized state, and the ON / OFF of energization may be controlled by a sensor, a switch, or the like.

  The heating means 19 preferably has a sheet resistance value of 130 to 500Ω / □. Furthermore, the emissivity of the heating means 19 is preferably 0.6 or less in accordance with JIS R 33106 (1998). More preferably, it is 0.5 or less according to JIS R 33106 (1998).

  In the multilayer glass structure 102 for a frozen showcase that is the third embodiment, by heating the second glass plate 12 by the heating means 19 provided on the inner surface of the second glass plate 12, Condensation on the outside of the second glass plate 12 can be prevented.

  Moreover, since the 1st anti-fog layer is provided in the surface inside the store | warehouse | chamber of the 1st glass plate 11, when the door for freezing showcases is opened, it is to the surface inside the store | warehouse | chamber of the 1st glass plate 11 Condensation and icing can be prevented, and visibility of products in the warehouse can be maintained.

  Further, when the heating means 19 has a sheet resistance value of 130 to 500Ω / □ and an emissivity of 0.6 or less in accordance with JIS R 33106 (1998), the surface of the first glass plate 11 on the outer side is Since the first low radiation film is provided and the space 18 is filled with a heat insulating gas, even if it is used for a door for a refrigeration showcase having a temperature inside the warehouse of −18 ° C. or lower, the refrigeration show is provided with a heat insulating performance. It is possible to reduce the weight of the multi-layer glass structure 102 for a case, and it is easy to handle even a relatively weak user such as an elderly person or a child.

  The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above-described embodiments, and various modifications, improvements, and substitutions can be made to the above-described embodiments without departing from the scope of the present invention. Can be added.

  The multilayer glass structure according to the present invention is suitable for a frozen showcase used for storing ice, frozen food, and the like. Further, it is obvious that the present invention can be applied not only to the hinged door but also to a sliding door and a fixed window. The present invention can also be applied to windows of automobiles, railway vehicles, airplanes, ships, or buildings. Furthermore, in the door structure according to the present invention, laminated glass or a resin plate can be appropriately used as an example of the glass plate.

100, 101, 102 Multi-layer glass structure for frozen showcase 11 First glass plate 12 Second glass plate 13 Spacer 14 First antifogging layer 15 Second antifogging layer 16 First low radiation film 17 Transparent film containing metal oxide 18 Space 19 Heating means

Claims (7)

A first glass plate located inside the freezer showcase;
A second glass plate opposed to the first glass plate across a predetermined space and located outside the warehouse;
A multi-layer glass structure for a frozen showcase that forms an integral structure by holding the peripheral portions of the first and second glass plates via a spacer,
A first anti-fogging layer is provided on the inner surface of the first glass plate,
A first low radiation film is provided on the outer surface of the first glass plate,
A transparent film containing metal oxide is provided on the inner surface of the second glass plate,
A multilayer glass structure for a refrigerated showcase, wherein the space is filled with a heat insulating gas.   The multilayer glass structure for a frozen showcase according to claim 1, wherein the antifogging layer is a hydrophilic film.   The multilayer glass structure for a refrigeration showcase according to claim 1 or 2, wherein the transparent film containing metal oxide is a second low radiation film.   The multilayer glass structure for frozen showcases according to claim 3, wherein a second anti-fogging layer is provided on the outer surface of the second glass plate.   The multilayer glass structure for a refrigeration showcase according to claim 1 or 2, wherein the transparent film containing metal oxide is a heating means.   The multilayer film for a frozen showcase according to claim 5, wherein the transparent film containing metal oxide is a film made of tin oxide doped with antimony, tin oxide doped with bismuth, or tin oxide doped with fluorine. Glass structure.   A refrigerated showcase comprising the multilayer glass structure for a refrigerated showcase according to any one of claims 1 to 6.

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