JP2012161409A - Open showcase - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an open showcase in which a cool air circulation duct and a storage chamber formed so as to be divided therefrom are formed inside a showcase body comprising a U-shaped heat insulation housing, and continuous with the cool air circulation duct, an blow-off port with the honeycomb flow straightening body attached thereto and an suction port opposing to the blow-off port are provided in an opening end part of the storage chamber and a cold air curtain is formed blowing off from the blow-off port to the suction port, the open showcase being configured to prevent stains and dew/frost from sticking to the honeycomb flow straightening body as much as possible and being given such a consideration that no cool air circulation is obstructed by the stains and dew/frost.SOLUTION: The honeycomb flow straightening body is coated on the surface with an antibacterial and/or water-repellent film. The antibacterial and/or water-repellent film is a coating film 103 that exhibits a stain resistant performance and has the initial hydrophilicity and long hydrophilic persistence.

Description

  The present invention is installed in a supermarket, a convenience store, etc., and the product is taken in and out of the front or top opening to the inside product storage, and an air curtain is formed in the opening by a cold airflow to cool the product to a cold temperature. It relates to a freezer / refrigerated open showcase for storage.

  Of the frozen and refrigerated showcases for the sale and display of food, the built-in refrigerated and refrigerated showcases that integrate the compression refrigeration unit and the box that constitutes the display room are equipped with doors for taking out products. The closed type and the open type without doors for taking out products are also available, and the open type mainly has one or more display rooms to keep prepared food, drinks, alcoholic beverages, etc. There is a multi-stage showcase (ceiling-out type) with an air curtain on the front and a flat show with an air curtain on the upper surface, and there is at least one display room for keeping prepared dishes, drinks, alcoholic beverages, etc. There is a case.

A multi-stage showcase among such open-type showcases will be described below. As shown in FIG. 1, as shown in FIG. The front open-type outer box 1a and the inner box 1b are partitioned, and between the outer box 1a and the inner box 1b, inner and outer double cold air circulation ducts 2 and 3 are defined on the outer periphery of the inner box 1b. The inside is formed as a storage chamber.
JP 2006-110125 A

  The air curtain outlets 2a and 3a are opened on the front upper side of the case body 1 and the air curtain inlets 2b and 3b are opened on the lower side of the case body 1 in a row with the cold air circulation ducts 2 and 3.

  In addition, a cooler (evaporator of the refrigerator) 4 and a fan 5 are provided in the cool air circulation duct (inner duct) 2 in the inner layer, and a fan 6 is provided in the cool air circulation duct (outer duct) 3 in the outer layer.

  Further, a honeycomb rectifier 7 is provided at the air curtain outlets 2a and 3a, and two cold air curtains A and B are blown out through the honeycomb rectifier 7 on the front surface of the storage chamber through the honeycomb rectifier 7 during the cool-down operation of the showcase. Keep cool inside. In addition, 8 is a merchandise display shelf in the storage room, and 9 is a canopy portion provided on the upper front surface of the case body 1.

As shown in FIG. 2, the honeycomb rectifying body 7 is formed of a honeycomb structure 12, and this honeycomb structure 12 is also disclosed in the following patent document. Apply an adhesive, then laminate and bond these multiple sheets, cut them to the desired width, and obtain a laminate, and then expand the laminate while heating, so that the shape of the front is a honeycomb shape It will be.
JP 9-313309 A

  When the honeycomb rectifier 7 is attached to the showcase body 1, as shown in FIG. 3, the honeycomb rectifier 7 is inserted into the outlets 2a and 3a with the honeycomb support member 21 provided along the rear end of the honeycomb structure 12, thereby supporting the honeycomb. The stopper 22 containing the shaft 23 formed on the member 21 is inserted into the hole 25 formed on the honeycomb post-pressing member 24 and fixed, so that it can be attached to the showcase body 1. In the figure, 11 is a honeycomb front pressing member.

  In the honeycomb structure 12 having a honeycomb shape that is stretched, the reinforcing members 13A and 13B are pasted on the front and rear surfaces, which are both side surfaces, to reliably prevent deformation.

  In the figure, reference numeral 10 denotes a lead-out portion for pulling out the honeycomb rectifier 7 from the air outlets 2a and 3a. The lead-out portion 10 is provided at an upper portion and a lower portion of the rear surface, which is the outer surface of the rear reinforcing member 13B. Since the pullout piece 10 is mounted on the lower surface of the rear reinforcing member 13B, the mounting direction is uniquely determined by the pullout piece 19. Can be attached securely.

  Further, the distance between the honeycomb pre-pressing member 11 and the honeycomb post-pressing member 24 is larger than the width of the honeycomb structure 12, and the width of the honeycomb rectifier 7 in which the front and rear reinforcing members 13A and 13B are added to the honeycomb structure 12. When the honeycomb rectifying body 7 is attached to the air outlets 2a and 3a, the elastic portion 15 is deformed so that the hollow portion 16 is crushed because the elastic portion 15 is in contact with the honeycomb post-pressing member 11 in the state as it is. Are inserted into the air outlets 2a and 3a. In this inserted state, the honeycomb rectifier 7 is firmly fixed to the outlets 2a and 3a by the restoring force accompanying the deformation of the elastic portion 15. Further, when the honeycomb member 14 is removed, it can be easily removed by pulling the handle portion 19 downward.

  Since the cold air outlet by the honeycomb rectifier is kept at a low temperature, when outside air with high humidity enters the air curtain, dew and frost adhere to the honeycomb rectifier of the cold air outlet and prevent cold air circulation, Maintaining the temperature of the storage room may be harmed, and if frost remains on the honeycomb rectifier, dust and dirt adhere to it and soot and bacteria grow, which makes it unsanitary.

  Condensation grows into large droplets when the operation is continued for a long time, and even if it does not drip, the water droplets are retained and do not dry for a long time. Blue mold grows, producing odor and mold spores may be scattered.

  In particular, the honeycomb rectification body is a collection of polygonal cylinders and cylindrical tunnel bodies represented by a hexagonal cross section, and is porous and elongated, so that clogging is likely to occur.

  The present invention eliminates the inconvenience and forms a cool air circulation duct and a storage chamber partitioned from the cool air circulation duct on the inner side of the showcase main body by the U-shaped heat insulating casing, and is connected to the cold air circulation duct. In an open showcase in which an air outlet with a honeycomb rectifier attached to the opening end of the air outlet and a suction port opposite thereto is provided to form a cool air curtain that blows out from the air outlet toward the suction port, dirt and dew on the honeycomb rectifier -It is to provide an open showcase in which frost is prevented from adhering as much as possible so as not to disturb cold air circulation.

  In order to achieve the above object, according to the present invention, a cold air circulation duct and a storage compartment partitioned with the cold air circulation duct are formed inside the showcase main body by a U-shaped heat insulating casing. In an open showcase that forms a cold air curtain that blows out from the blowout port toward the suction port, provided with a blowout port that is connected to the duct at the opening end of the storage chamber and attached with a honeycomb rectifier, and a suction port facing the blowout port. The gist of the honeycomb rectifier is that its surface is coated with an antibacterial or / and water-repellent coating.

  According to the first aspect of the present invention, the honeycomb rectifier body is coated with a coating composition that forms an antibacterial or / and water-repellent coating film, so that dew and frost adhere to it and cool air circulation occurs. It is possible to prevent hindering and deteriorating the temperature maintenance of the storage room, and it is possible to maintain the hygienic state by preventing the adhesion of dust and dirt and the propagation of soot and bacteria.

  The gist of the present invention described in claim 2 is that the antibacterial and / or water repellent coating film exhibits antifouling performance and is a coating film having an initial hydrophilicity and a long-lasting hydrophilic durability. It is.

  According to the second aspect of the present invention, in addition to the above action, the coating film has an antifouling performance, initial hydrophilicity, and long-term hydrophilic sustainability even when the honeycomb rectifier is exposed to condensed water or the like. Even if it does not drip, it grows into large water droplets, and even if it does not drip, it will not dry for a long time because the water droplets are retained, so black mold and blue mold grow using the dirt attached by the collision of the wind as a nutrient. Thus, an odor is generated and mold spores can be prevented from scattering.

  According to a third aspect of the present invention, the coating film contains silica fine particles and fluororesin particles, and the fluororesin particles are partially exposed from the surface of the silica film in the silica film composed of the silica fine particles. In summary, the exposed area of the silica film is larger than the exposed area of the fluororesin particles.

  According to the third aspect of the present invention, the coating film is formed on the surface of the resin part, contains the silica fine particles and the fluororesin particles, and the coating film contains the fluororesin particles in the silica film made of silica fine particles In a long period of time because it has a coating composition in which the exposed area of the silica film is larger than the exposed area of the fluororesin particles. Simultaneously prevents resin parts from being exposed to dew and preventing contamination.

  As described above, the open showcase of the present invention forms a cool air circulation duct and a storage compartment partitioned with the cool air circulation duct inside the showcase main body by the U-shaped heat insulation housing. In the open showcase, in which an air outlet having a honeycomb rectifier attached to the opening end of the storage chamber and a suction port opposite to the air outlet are provided, and a cool air curtain that blows out from the air outlet toward the suction port is formed. By covering the surface with an antibacterial or / and water-repellent coating, the fluid can prevent dew and frost from adhering to obstruct cold air circulation and impair the maintenance of the storage room temperature. It is possible to maintain the hygienic state by preventing the adhesion of bacteria and the growth of moths and bacteria.

  Hereinafter, embodiments of the invention will be described in detail with reference to the drawings. FIG. 4 is a partially enlarged cross-sectional view of the honeycomb structure 12 of the honeycomb rectifier 7 in the open showcase of the present invention. The honeycomb rectifier 7 is a show with a U-shaped heat insulating housing as described in FIG. A cool air circulation ducts 2 and 3 and a storage chamber partitioned with the cool air circulation ducts 2 and 3 are formed inside the case main body 1, and the outlets 2 a and 3 a are connected to the cool air circulation ducts 2 and 3 at the opening end of the storage chamber. Opposing inlets 2b and 3b are provided and attached to the outlets 2a and 3a of an open showcase that forms a cold air curtain that blows out from the outlets 2a and 3a toward the inlets 2b and 3b.

  In the present invention, the surface of the honeycomb structure 12 constituting the honeycomb rectifier 7 is coated with an antibacterial or / and water-repellent coating film 103.

  The coating film 103 is antibacterial because it exhibits antifouling performance against various types of dirt, is hydrophobic to suppress water droplet growth, and has excellent long-term durability (adhesion / peelability). It is what has.

  The coating film 103 is formed by a coating composition 200 coated on the honeycomb structure 12 which is a resin part. The coating composition 200 includes water (dispersion liquid) in which silica fine particles 101 are dispersed, and fluororesin particles 102. Is obtained by mixing with water (dispersion liquid) in which is dispersed.

  Before the coating film 103 is formed, it is in a liquid state in which the silica fine particles 101 and the fluororesin particles 102 are dispersed in moisture. After the honeycomb structure 12 is immersed in the dispersion, it is dried and moisture is contained. As a result, the coating film 103 is formed on the surface of the honeycomb structure 12.

  The coating film 103 is in a state where the fluororesin particles 102 are scattered in the silica film 104 made of the silica fine particles 101 and the fluororesin particles 102 are partially exposed from the surface of the silica film 104. Have

  The average particle diameter (average particle diameter) of the silica fine particles 101 used in the coating composition 200 is 15 nm or less, preferably 4 to 12 nm when measured by a light scattering method. The particle size can be measured by a light scattering method. Thus, in the state of the coating solution dispersed in water, the silica fine particles 101 having an extremely small average particle diameter are in a state where all the surface portions in contact with water are in equilibrium and are partially dissolved in water (the surface in contact). When the coating composition 200 is dried, the semi-dissolved silica component becomes a binder that connects the silica fine particles 101 to each other (a binder that hardens the particles). ), The silica fine particles 101 aggregate and solidify easily after drying without adding a special binder. Therefore, it is possible to obtain the silica film 104 that is excellent in strength, such as being hard to crack, and thus the coating film 103.

  In the silica fine particles 101 having an average particle diameter in the range of 4 to 15 nm, the surface portion corresponding to about 15 to 30% of the weight of the silica fine particles 101 is half water in the coating solution. It is in a dissolved state.

  Further, by using silica fine particles 101 having an average particle size of 15 nm or less as the silica fine particles 101, the silica film 104 in the obtained coating film 103 has fine voids between the silica fine particles 101 while being dense. It becomes.

  The content of the silica fine particles 101 in the coating composition 200 is 0.1 to 5% by weight, preferably 0.3 to 2.5% by weight with respect to the coating composition 200. Using the coating composition 200 having a content (concentration) in this range, a liquid film is formed on the surface of the honeycomb structure 12 by dipping, and the excess coating solution is poured away or forcibly removed and dried. When coating is performed by this method, the thickness of the coating film 103 to be formed is about 50 to 500 nm, the silica film 104 can have a uniform thickness without unevenness, and the color tone and texture of the surface of the object to be coated are impaired. It is possible to form the coating film 103 having no surface.

  In the coating film 103, the average particle diameter (average particle diameter) of the fluororesin particles 102 which are scattered in the silica film 104 and partially exposed from the silica film 104 is not 50 to 500 nm, preferably 100. Those with ~ 250 nm are used. The particle size can be measured by a light scattering method. By using a particle having a particle diameter in such a range, the particle diameter becomes larger than the thickness of the silica film 104, and the fluororesin particles 102 are easily dispersed in the silica film 104 in the formed coating film 103. The fluororesin particles 102 are easily partially exposed on the surface of the coating film 103 (from the surface of the silica film 104), and a desired state of the coating film 103 can be obtained.

  In the coating film 103 formed on the surface of the coating object by drying the coating composition 200, the thickness of the silica film 104 is smaller than the average particle diameter of the fluororesin particles 102. By managing the thickness of the silica film 104 to be smaller than the average particle diameter of the fluororesin particles 102, the fluororesin particles 102 are dispersed and dispersed in the silica film 104 in the coating film 103 to be formed, The silica film 104 can be partially exposed from the surface of the silica film 104, and a desired state of the coating film 103 can be obtained.

  The weight ratio of silica fine particles 101 and fluororesin particles 102 in coating composition 200 (weight of silica fine particles 101: weight of fluororesin particles 102) is 50:50 to 95: 5, preferably 75:25. . If the weight ratio is in such a range, the coating film 103 in which the hydrophilic region formed by the silica fine particles 101 (silica film 104) and the hydrophobic region formed by the fluororesin particles 102 are mixed in a balanced manner can be obtained by drying at room temperature. . The good balance between the hydrophilic region and the hydrophobic region affects the antifouling performance.

  Next, the antifouling performance of the coating film 103 will be described. The fouling substances that cause fouling include a hydrophilic fouling substance 105 and a hydrophobic fouling substance 106.

  The hydrophilic fouling substance 105 is likely to adhere to a portion showing hydrophilicity and difficult to adhere to a portion showing hydrophobicity. And the hydrophobic fouling substance 106 is the opposite. The hydrophilic fouling substance 105 is dust, dust, or the like. The hydrophilic fouling substance 105 and the hydrophilic fouling substance 105 and the hydrophilic portion (OH group) present in the hydrophilic portion of the article surface are electrostatically coupled to each other, or the hydrophilic fouling substance 105 It adheres to the hydrophilic part of the article surface (including the surface of the coating film 103) by intermolecular force due to the proximity of the substance 105 and the hydrophilic part of the article surface, or by liquid cross-linking with a liquid such as water. .

  Sand dust, which is the hydrophilic fouling substance 105 floating in the air, is a fine particle having a size of several μm to several tens of μm. Dust, which is also the hydrophilic fouling substance 105, is much larger than sand dust and has a size of 0.1 mm to 5 mm. In order for such a hydrophilic fouling substance 105 to adhere to the hydrophilic portion on the surface of the article by the above-described action, the hydrophilic fouling substance 105 and the hydrophilic portion on the article surface can be sufficiently adhered (can be contacted). ) Only hydrophilic area must be present.

  However, the coating film 103 formed by the coating composition 200 is hydrophilic, including sand dust, because the fluororesin particles 102 exhibiting hydrophobicity are appropriately dispersed in the silica film 104 exhibiting hydrophilicity. There is almost no surface of the silica film 104 having a continuous area that allows the fouling substance 105 to stably adhere. The hydrophilic fouling substance 105 adhering onto the coating film 103 is caused by the hydrophobicity of the surface of the fluororesin particles 102 protruding (exposed) from the silica film 104 or the physical properties of the protruding fluororesin particles 102. Due to the inhibition, the surface of the silica film 104 cannot be sufficiently adhered. For this reason, the hydrophilic fouling substance 105 is easily detached and does not adhere to the coating film 103.

  Further, the silica film 104 is composed of silica fine particles 101 (the role of the binder is also played by the silica component of the silica fine particles 101), and is a porous film having fine voids between the silica fine particles 101, so the density is small. Even if the hydrophilic fouling substance 105 comes close, the intermolecular force is small and it is difficult to fix the hydrophilic fouling substance 105.

  Furthermore, since the porous silica film 104 has fine voids between the silica fine particles 101, even if liquid crosslinking is caused by water or the like, the water between the hydrophilic fouling substance 105 and the silica film 104 surface, Since it is removed through fine voids in the silica film 104 and liquid cross-linking is lost, the hydrophilic fouling substance 105 is not fixed by liquid cross-linking.

  As described above, the coating film 103 formed by the coating composition 200 exhibits excellent antifouling performance against the hydrophilic fouling substance 105.

  In the coating composition 200, since the weight ratio of the silica fine particles 101 and the fluororesin particles 102 is 50:50 to 95: 5, the silica film 104 of the coating film 103 formed with the coating composition 200 in this range is used. The fluororesin particles 102 are scattered at appropriate intervals so that the electrification can be suppressed, that is, the silica film 104 has a continuous area to the extent that the charge can be leaked. There is an effect to prevent the adhesion of. By coating the surface of the article with the coating composition 200 and forming the coating film 103 on the surface, contamination due to static electricity can be prevented.

  The hydrophobic fouling substance 106 is oil smoke, carbon, cigarette dust, etc., and those that cause fouling are those floating in the air as fine particles. The particle diameter is 5 μm or less, and most are 0.1 to 0.3 μm, which is smaller than the hydrophilic fouling substance 105.

  Since the hydrophobic fouling substance 106 has a hydrophilic group or adsorbed moisture on the surface portion that exhibits hydrophilicity, it is difficult to adhere to the surface portion that exhibits hydrophilicity, and is easily adhered to the surface portion that exhibits hydrophobicity. The reason why such a hydrophobic fouling substance 106 adheres to the surface of the article is due to intermolecular forces generated by the hydrophobic fouling substance 106 coming into close contact with the surface portion exhibiting hydrophobicity.

  What is hydrophobic in the coating composition 200 is the fluororesin particle 102 having an average particle diameter of 50 to 500 nm as described above. In the coating film 103 formed on the surface of the article, the fluororesin particles 102 may be larger than a single particle size due to deformation or coalescence, but the size of the hydrophobic fouling substance 106 that causes contamination is large. In many cases, the fluororesin particle 102 having a surface portion exhibiting hydrophobicity that is equal to or smaller than the above does not have an area where the hydrophobic fouling substance 106 can sufficiently adhere.

  In such a case, intermolecular forces that are fixed to each other do not act, and the hydrophobic fouling substance 106 is difficult to fix to the fluororesin particles 102 exhibiting hydrophobicity. Naturally, the hydrophobic fouling substance 106 does not adhere to the hydrophilic silica film 104, so that the coating film 103 exhibits high antifouling performance against the hydrophobic fouling substance 106.

  The fluororesin particles 102 of the coating composition 200 are surfaced by a surfactant added during polymerization of the fluororesin, in a dispersion in water, and in a coating solution mixed with the dispersion of silica fine particles 101. Is in a state showing hydrophilicity. When the coating film 103 is dried, the surfactant is peeled off and the surface of the fluororesin particles 102 becomes hydrophobic, but the silica fine particles 101 coexist in the coating solution. Therefore, the silica fine particles 101 having a smaller particle diameter than the fluororesin particles 102 are sparsely attached to the surface of the fluororesin particles 102 of the coating film 103 formed after drying.

  Thus, since the silica fine particles 101 having hydrophilic groups (showing hydrophilicity) are scattered and attached to the surface of the fluororesin particles 102, the surface of the fluororesin particles 102 is partially covered with the hydrophobic fouling substance 106. Thus, the hydrophobic fouling substance 106 smaller than the fluororesin particles 102 is less likely to adhere. By partially introducing a hydrophilic group onto the surface of the fluororesin particle 102, an effect of suppressing the adhesion between the fluororesin particle 102 and the hydrophobic fouling substance 106 can be obtained. Even if the hydrophobic fouling substance 106 adheres to the surface of the fluororesin particles 102, the silica fine particles 101 are scattered and adhered, so the adhesion is unstable and can be easily detached.

  On the other hand, even on the surface of the fluororesin particles 102 on which the silica fine particles 101 are sparsely adhered, the hydrophilic fouling substance 105 which is much larger than the size of the silica fine particles 101 is sufficient. Therefore, the hydrophilic fouling substance 105 does not adhere to the surface of the fluororesin particles 102. Further, although the fluororesin particles 102 have a flexible surface, the surface of the fluororesin particles 102 is hardened by the silica fine particles 101 adhering sparsely in this manner, and the hydrophobic fouling substances 106 are adhered to each other. The effect which becomes difficult to do is also acquired.

  In addition, the fluororesin itself has a very low surface energy and a low coefficient of friction, as is well known in the fluororesin coating, so that it not only exhibits hydrophobicity but also has oil repellency. Compared to a hydrophobic resin, the hydrophobic fouling substance 106 is less likely to stick. This is one of the effects that the hydrophobic fouling substance 106 does not adhere to the fluororesin particles 102.

  As the fluororesin particles 102 in the coating composition 200, PTFE (polytetrafluoroethylene), FEP (tetrafluoroethylene / hexafluoropropylene copolymer), PFA (tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer), ETFE (ethylene / tetrafluoroethylene copolymer), ECTFE (ethylene / chlorotrifluoroethylene copolymer), PVDF (polyvinylidene fluoride), PCTFE (polychlorotrifluoroethylene), PVF (polyvinyl fluoride), etc. These copolymers or mixtures, or those obtained by mixing these with other resins can be used.

  As described above, the coating film 103 formed on the surface of the honeycomb structure 12 by the coating composition 200 does not fix both the hydrophilic fouling substance 105 and the hydrophobic fouling substance 106, and can be easily adhered. Therefore, the surface of the coated honeycomb structure 12 can be prevented from being soiled by exhibiting excellent antifouling performance and releasability.

  The coating film 103 also exhibits water repellency. FIG. 5 is a schematic diagram for explaining the contact angle θ of the water droplet 50.

  Here, the contact angle θ is an angle formed by a tangent line TL at a portion of the water droplet 50 attached to the resin surface in contact with the resin surface and the resin surface. The smaller the contact angle θ, that is, the closer to 0 degrees, the adhering water droplets 50 spread flat on the resin surface, and the water droplets are less likely to grow and are easier to dry. High hydrophilicity means that the attached water droplet 50 is likely to spread, that is, the smaller the contact angle θ (closer to 0 degree), the higher the hydrophilicity or the higher the hydrophilicity.

  In FIG. 5, the water droplet 50 shown in (b) has a smaller contact angle θ than the water droplet 50 shown in (a).

  As the material of the honeycomb structure 12, general-purpose organic resins such as PS (polystyrene), ABS (acrylonitrile butadiene styrene), and PP (polypropylene) are often used. The contact angle of these resins is at least 50 degrees or more, generally around 80 degrees, and is a water repellent surface. Therefore, since the contact angle θ is large, the time for which the water droplet 50 exists as a water droplet is long, and when water adheres, the water droplet grows large and eventually drops.

  If the retention time of water droplets is long, the growth rate of mold increases, and black mold and blue mold cover the resin part using surrounding dirt and air as a medium.

  The honeycomb structure 12 to which the coating composition 200 of the present embodiment is applied microscopically has both hydrophilic and hydrophobic properties, but a highly hydrophilic silica film composed of hydrophilic silica fine particles 101. 104, the fluororesin particles 102 are interspersed in the silica film 104 so as to be partially exposed from the surface of the silica film 104, and the exposed area of the silica film 104 is larger than the exposed area of the fluororesin particles 102. Because of its large size, it exhibits high hydrophilicity as a whole due to the effect of continuously connected silica. When a specific static contact angle is measured, it shows about 10 to 20 degrees and has high hydrophilicity. Therefore, compared to the conventional resin without the coating composition 200 having a contact angle of about 80 degrees, it is possible to suppress water droplet growth by spreading water and prevent splashing of water droplets. The surface area that touches the surface increases and the drying speed is improved.

  Therefore, the time during which moisture is present on the resin surface is shortened, and mold growth can be suppressed.

  In the above embodiment, a multi-stage showcase (ceiling blowout type) has been described. However, the present invention has one or more display chambers as an open showcase, and a honeycomb at the outlet of a flat showcase having an air curtain formed on the upper surface. It can also be applied to rectifiers.

It is a vertical side view of a multistage open showcase. It is a perspective view of the honeycomb rectification body of the blower outlet of a showcase. It is a component block diagram of the blower outlet of a showcase. It is a schematic diagram of the honeycomb rectifier coated with the coating composition. It is a schematic diagram explaining the contact angle (theta) of the water droplet adhering to the surface of a fin.

DESCRIPTION OF SYMBOLS 1 Case main body 1a Outer box 1b Inner box 2, 3 Air circulation duct 2a, 3a Air curtain outlet 2b, 3b Air curtain inlet 7 Honeycomb rectifier 12 Honeycomb structure 50 Water droplet 101 Silica microparticle 102 Fluororesin particle 103 Coating film 104 Silica membrane 105 hydrophilic fouling substance 106 hydrophobic fouling substance,
200 Coating composition

Claims (3)

A cool air circulation duct and a storage chamber partitioned with the cool air circulation duct are formed inside the showcase main body with a U-shaped heat insulation casing, and a honeycomb rectifier is connected to the cold air circulation duct at the opening end of the storage chamber. In the open showcase that forms the cold air curtain that blows out from the outlet to the inlet, with the attached outlet and the inlet facing it,
An open showcase, wherein the honeycomb rectification body has a surface coated with an antibacterial or / and water-repellent coating.   The open showcase according to claim 1, wherein the antibacterial and / or water-repellent coating film is an antifouling property and is a coating film having an initial hydrophilicity and a long-lasting hydrophilic durability.   The coating film contains silica fine particles and fluororesin particles, and is formed by being interspersed in the silica film composed of silica fine particles so that the fluororesin particles are partially exposed from the surface of the silica film. The open showcase according to claim 2, wherein an exposed area of the film is larger than an exposed area of the fluororesin particles.

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