Door frame material

Abstract

This system helps to suppress, at low cost, the condensation caused by the temperature difference between the first and second spaces separated by a door, preventing it from falling as large water droplets, and also prevents quality deterioration due to condensation. [Solution] The outer frame material 13 is arranged to surround the frame 122 that constitutes the door 12, and is composed of an inner surface 131a facing the frame 122 and an outer surface 131b that does not face the frame. At least the inner surface of the outer frame material 13 has a hydrophilic film layer formed on it, which is a hardened coating made of a hydrophilic material. Furthermore, uneven grooves M1 and protrusions M2 having the hydrophilic film layer on their surface are formed in the left-right longitudinal direction on the vertical surface of the inner surface 131a of the outer frame material, thereby directing condensation water in the left-right direction of the outer frame material 13 and suppressing the falling of water droplets.

Description

Technical Field

[0001] The present invention relates to the treatment of outer frame materials and window frame materials for doors that suppress the dripping of condensed water caused by the temperature difference between air.

Background Art

[0002] In the door of a showcase for refrigeration or freezing of beverages or the like, condensation occurs due to the temperature difference between the inside and outside of the cabinet. When water droplets are generated by condensation and the water droplets fall onto the floor surface or the like due to the opening and closing operation of the door, it not only causes damage to the aesthetics and the generation of mold, but also causes problems such as increased slipperiness. Therefore, it is required to prevent the falling of the condensed water (condensed droplets).

[0003] In order to prevent and suppress condensation on the doors of showcases, window glasses in buildings, and mirrors in bathrooms, dew prevention films having a heat insulation effect for creating a temperature difference on the surfaces of glasses and mirrors, and measures have been taken by means of reducing the surface tension of the surfaces of glasses and mirrors with surfactants. However, the frame materials of the doors of showcases and window frame materials are often made of metals such as aluminum, and since the thermal conductivity is high, water droplets due to condensation are generated in the same manner as in glasses and mirrors.

[0004] Therefore, Patent Document 1 discloses a hydrophilic member having a linear fine concavo-convex shape on the surface in which a plurality of mutually parallel linear convex portions extend in one direction or substantially one direction, and including a linear fine concavo-convex layer made of a cured product of a resin composition, in which the condensation on the surface does not become water droplets and is likely to spread by wetting. Further, Patent Document 2 discloses a dew condensation inhibitor that can be used not only for glass but also for sashes, that is, a dew condensation inhibitor containing (a) colloidal silica, (b) a modified polyvinyl alcohol in which some or all of the hydroxyl groups are silylated, and (c) a surfactant.

Prior Art Documents

Patent Documents

[0005] [Patent Document 1] Japanese Patent Publication No. 2015-212046 [Patent Document 2] Japanese Patent Publication No. 2002-080832 [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] However, forming the linear fine uneven layer disclosed in Patent Document 1 is difficult on components with complex shapes, such as the outer frame material of a showcase door or window frame material, and the formation cost becomes high. Similarly, applying the condensation water suppressant disclosed in Patent Document 2 to components with complex shapes, such as the outer frame material of a showcase door or window frame material, is also difficult. Therefore, the objective of the present invention is to solve the above-mentioned problems and to provide outer frame materials for refrigerated and frozen display cases and window frame materials for buildings that improve the effect of preventing water droplets from dripping due to condensation (by spreading condensation water in a predetermined direction such as left and right and preventing aggregation), thereby preventing quality deterioration due to condensation water and reducing economic costs. [Means for solving the problem]

[0007] In a door separating a first space and a second space, and an outer frame member that holds the door so as to be openable and closable, the outer frame member of the door of the present invention is arranged with a passage so as to surround the frame that constitutes the door, and is composed of an inner surface of the outer frame member facing the frame side and an outer surface of the outer frame member not facing the frame side, and is characterized in that a hydrophilic film layer, which is a coating of a hydrophilic material, is formed on at least the inner surface that constitutes the outer frame member. According to the present invention, a hydrophilic film layer, which is a hardened coating of a hydrophilic material, is formed on the inner surface constituting the outer frame material. As a result, condensation water spreads and wets the hydrophilic film layer, thereby suppressing the aggregation of condensation water. In other words, the formation of water droplets is suppressed, and thus the falling of water droplets can be prevented.

[0008] Furthermore, the binder, which plays a role in improving the adhesion between the hydrophilic film layer and the outer frame material which is the substrate, is characterized in that it is at least one ultraviolet-curing resin selected from monofunctional acrylate, difunctional acrylate, polyfunctional acrylate, and urethane acrylate. According to the present invention, even if the shape of the outer frame material or the frame constituting the door is complex, it is possible to form a uniform and stable hydrophilic film layer.

[0009] Furthermore, another possible embodiment is that a hydrophilic film having a hydrophilic film layer, in which the hydrophilic film layer of the present invention is a hardened film formed by applying a hydrophilic material to the other side of a film on which one side is an adhesive surface, is attached to at least the inner surface constituting the outer frame material. According to the present invention, when the shape of the outer frame material or door frame to which the adhesive is to be applied is simple, it is effective in maintaining hydrophilicity from the viewpoint of ease of replacement. Herein, the outer frame material of the door of the present invention is characterized by being made of synthetic resin, which has a lower thermal conductivity compared to a metallic outer frame material, thereby suppressing the generation of condensation water itself, and also allows for processing that prevents diffusion in a predetermined direction or aggregation at a predetermined location.

[0010] The present invention is characterized by forming grooves or protrusions with an uneven shape in the left-right longitudinal direction on the vertical surface of the inner surface of the outer frame material, and then forming the hydrophilic film layer to allow condensation water generated by condensation to flow in the left-right direction on the vertical surface. Here, the size and shape of the grooves or protrusions in the cross section can be provided at equal intervals. Furthermore, the spacing between the grooves or protrusions may be narrowed as one goes downwards, or the internal volume may be increased, such as by creating a V-shape. According to the present invention, by directing the condensation water generated by condensation on the vertical surface of the inner surface of the outer frame material in a left-right direction, the condensation water can be diffused before it becomes a large volume. Furthermore, the present invention is characterized in that grooves or protrusions having the hydrophilic film layer on their surface are formed in the left-right longitudinal direction of the vertical surface of the outer surface of the frame that constitutes the door of the outer frame material, thereby allowing condensation water generated by condensation to flow in the left-right direction of the outer frame material. According to the present invention, by directing condensation water generated by condensation to flow horizontally on the vertical surface of the outer frame that constitutes the door of the outer frame material, the condensation water can be dispersed before it becomes large (having the effect of dispersing the condensation water horizontally and preventing it from accumulating in a predetermined location).

[0011] The present invention is characterized by forming grooves or protrusions having the hydrophilic film layer on their surface at opposing positions on the inner surface of the outer frame material and the outer surface of the frame constituting the door, thereby allowing condensation water generated by condensation to flow in the left-right direction on the inner surface of the outer frame material and / or in the left-right direction on the outer surface constituting the frame of the outer frame material. [Effects of the Invention]

[0012] According to the present invention, the temperature difference between the first and second spaces separated by the door makes it possible to suppress the formation and falling of water droplets from condensation that forms on the door and the outer frame material and window frame material of the showcase door that are held open and closed, thereby preventing quality deterioration due to condensation. Furthermore, according to the present invention, a hydrophilic film layer can be formed not only on new products but also on already used showcases and building window frame materials at the desired timing (making repair, modification, and other processing easier with hydrophilic films, etc.), thus contributing to the reduction of economic costs. [Brief explanation of the drawing]

[0013] [Figure 1] This is a schematic diagram showing the external appearance of a showcase in the first embodiment of the present invention. [Figure 2] This is a schematic diagram showing the glass door and outer frame material of a showcase in the first embodiment of the present invention. [Figure 3] This is a schematic diagram showing the relationship between the outer frame material and the frame that constitutes the glass door in this embodiment. [Figure 4] It is a schematic cross-sectional view showing the state and formation position of water droplets formed on the glass door and outer frame material of a conventional showcase. [Figure 5] It is a schematic cross-sectional view showing the outer frame material in the present embodiment. [Figure 6] It is a schematic cross-sectional view showing the state of condensed water on the glass door and outer frame material of the showcase in the present embodiment. [Figure 7] It is a schematic cross-sectional view showing another embodiment of the outer frame material in the present embodiment. [Figure 8] It is a schematic cross-sectional view for explaining the concave-convex grooves and protrusions on the outer frame material in the second embodiment of the present invention. [Figure 9] It is an enlarged schematic cross-sectional view showing how the grooves and water droplets in FIG. 8 spread. [Figure 10] It is a schematic view showing an example of the shape of the groove or protrusion in the second embodiment of the present invention. [Figure 11] It is a schematic cross-sectional view for explaining the grooves on the outer frame material and the frame in the second embodiment of the present invention. [Figure 12] It is a photograph showing the experimental results comparing the examples and comparative examples of the outer frame material and the frame in the second embodiment of the present invention. [Figure 13] It is a schematic cross-sectional view and a photograph showing how the water droplets spread in a partial shape in FIG. 10. It is a photograph showing the experimental results shown. [Figure 14] In the second embodiment of the present invention, a hydrophilic film layer (hydrophilic layer) is provided on the frame material, and it is a diagram showing concave-convex grooves and protrusions on which the hydrophilic film layer is formed.

Embodiments for Carrying Out the Invention

[0014] Regarding the first embodiment according to the present invention, it will be described in detail below based on the drawings.

Examples

[0015] (Showcase) Figure 1 is a schematic diagram showing a typical refrigerated display case 1 (hereinafter referred to as display case 1) used in restaurants, supermarkets, and convenience stores to store food and beverages at appropriate temperatures while displaying them in an easily viewable manner. The showcase 1 is composed of, externally, a housing 11 that supports the structure, a glass door 12 on at least one side of the housing 11 that allows the contents inside the showcase to be viewed, and an outer frame material 13 that slidably holds the glass door 12. At the bottom of the enclosure is the cooling system, which can be considered the heart of the display case. This system consists of a compressor, evaporator, condenser, and refrigerant circulation pipes. Furthermore, fans and ventilation systems circulate the cool air evenly, adjusting the temperature so that it is uniform throughout the display case, thus keeping all the stored products at the appropriate temperature. Furthermore, the display case is equipped with a digital control device and a thermostat to manage the temperature and humidity inside, allowing the internal environment to be monitored in real time and automatically adjusted as needed.

[0016] Figure 2 is a schematic diagram showing the glass door 12 and outer frame material 13 of the showcase 1. The glass door 12 is composed of a glass plate 121 and a frame 122 into which the glass plate 121 is fitted. The outer frame material 13 is composed of an upper outer frame material 131, a lower outer frame material 132, a left outer frame material 133, and a right outer frame material 134, and holds the glass door 12 so that it can slide open and close. The outer frame material 13 may be made of wood or aluminum, as will be described later, but synthetic resin is more preferable from the standpoint of ease of molding and heat insulation, i.e., suppression of condensation. Figure 3(a) shows the relationship between the upper outer frame member 131 and the glass door 12 (and the frame 122 that constitutes it) as viewed from the right outer frame member 134 side, and Figure 3(b) is a schematic diagram showing the actual relationship between the upper outer frame member 131 and the glass door 12 (and the frame 122 that constitutes it). Here, the surface of the outer frame material 13 is composed of an inner surface 13a facing the glass door side and an outer surface 13b not facing the glass door side, and Figure 3(b) shows that the upper outer frame material 131 is composed of an inner surface 131a and an outer surface 131b. That is, the outer frame material 13 is arranged with a passage H so as to surround the frame 122 that constitutes the door, and the passage H is formed in a horizontal E shape, and opposing vertical surfaces are provided on the left and right and in the center between the inner surface 131a of the outer frame material facing the frame side and the frame 122. As will be described later, it is also effective to have uneven grooves M1 or protrusions M2 having the hydrophilic film layer L on the surface formed using the corners of the passage H (Figures 14(a)(b)).

[0017] Figures 4 and 14 show the relationship between the upper outer frame material 131 and the glass door 12 (the frame 122 that constitutes it) of a conventional showcase, illustrating the state in which water droplets D are formed from condensation C caused by the temperature inside the showcase (the second space in this embodiment) being lower than the temperature around the showcase (the first space in this embodiment), and the position where the water droplets D are formed. In this way, water droplets D are formed by the condensed water C, and as these droplets aggregate and gradually grow larger, they drip downwards (fall vertically) when subjected to impact such as the opening and closing of the glass door 12.

[0018] Therefore, as shown in Figures 5 and 6, the outer frame material 13 in this embodiment has a hydrophilic film layer L formed on it to suppress the formation of condensation water C into water droplets D (the moisture spreads on the film and does not fall vertically), that is, by forming a thin film F of water that spreads on the surface of the hydrophilic film layer L. In the figures, only the upper outer frame material 131 is shown as the outer frame material 13, but it is sufficient for the hydrophilic film layer L to be formed on at least the upper outer frame material 131, but it is preferable that it be formed on all outer frame material 13, both top and bottom and left and right, and it is even more preferable that the hydrophilic film layer L is also formed on the surface of the frame 122 that constitutes the glass door 12. In other words, it is even more preferable that the hydrophilic film layer L is formed on all of the inner surface of the synthetic resin outer frame material that faces the frame side and on the outer surface (outer peripheral surface) of the outer frame material that does not face the frame side, and that the hydrophilic film layer L is also formed on the surface of the frame 122 that constitutes the glass door 12.

[0019] (Hydrophilic membrane layer) In this embodiment, one method for forming the hydrophilic film layer L is to apply an organic hydrophilic material La to the outer frame material 13 to form a hardened film (organic hydrophilic film). Specific examples of cured coatings made from organic hydrophilic material La include films containing polymers of difunctional (meth)acrylates having sulfonic acid groups or salts thereof; films containing polymers of vinyl monomers having N-methylol groups or N-alkoxymethylol groups, vinyl monomers having sulfonic acid groups, and alkyl (meth)acrylate monomers; and films containing polymers having hydrophilic groups and alkoxysilyl groups. Furthermore, when using the above-mentioned hydrophilic material La as a film material, it is preferable to use a film that contains a binder having hydrophilic groups. Examples of hydrophilic groups include sulfonic acid groups or their salts, hydroxyl groups, carboxyl groups or their salts, poly(oxyalkylene) groups, ammonium salts, and the like.

[0020] In this embodiment, the hydrophilic film layer L formed can be made of an organic hydrophilic material, as well as inorganic materials such as titanium and silica, and nonionic surfactants. Nonionic surfactants (also called nonionic surfactants) are surfactants that do not ionize in water, and basically refer to surfactants having a structure in which a hydrophilic portion and a branched alkyl portion are linked by an ether bond or an ester bond. In this application, this includes hydrophilic surfactants and lipophilic surfactants. Furthermore, glycerin-containing compounds (glycerides) in which a hydrophilic portion and a branched alkyl portion are linked by ether or ester bonds, and these structures are connected by polyoxyethylene glycerin, are also included in the category of nonionic surfactants. Alternatively, the hydrophilic film T may have a hydrophilic surface as described above (Figure 13(a)(b)). For example, it may be a film obtained from a polymer or composition to which hydrophilicity has been imparted, or a film obtained by surface treating the surface of a film made of a hydrophobic polymer to impart hydrophilicity. The water contact angle should be 45° or less, preferably 30° or less, and more preferably 25° or less.

[0021] The thickness of the hydrophilic film layer L is preferably 0.1 μm or more, more preferably 1.0 to 5.0 μm, and even more preferably 2.5 to 3.5 μm. It has been found that if the thickness of the hydrophilic film L is above the lower limit of the above range, the generation of water droplets due to condensation, etc., is sufficiently suppressed, and if the thickness of the hydrophilic film L is below the upper limit of the above range, the hydrophilic film layer L is easily formed. Note that in the drawings (Figures 5 and 7), the thickness of the hydrophilic film layer L is shown as a different thickness from the actual thickness for the sake of ease of explanation.

[0022] In this embodiment, the binder component plays a role in stabilizing the structure of the cured film (hydrophilic film L) formed on the surface of the substrate, which is the outer frame material 13 and the target of hydrophilic material coating, and improving the adhesion between the film material and the substrate. UV-curing resins such as monofunctional acrylate, difunctional acrylate, polyfunctional acrylate, and urethane acrylate are preferred, but thermosetting resins such as polyurethane, polyvinyl alcohol, acrylic resin, and epoxy resin can be appropriately selected from known materials that can be used as binder components. By selecting these binder components, the coating hardens upon heating or UV irradiation, forming a hydrophilic coating L.

[0023] Next, as shown in Figure 5, the hydrophilic film layer L in this embodiment can be formed on the entire surface of the outer frame material 13, but as shown in Figure 7, the hydrophilic film layer L may also be formed only on the inner surface of the outer frame material 13, which is particularly prone to condensation, or the hydrophilic film layer L may also be formed on the surface of the frame 122 that constitutes the glass door 12.

[0024] In this embodiment, the coating methods for forming the hydrophilic film layer L include roll coating, spray coating, curtain coating, flow coating, bar coating, and brush coating, and can be selected as appropriate.

[0025] (Material of the outer frame) Furthermore, in this embodiment, the outer frame material 13 is made of resin. The resin outer frame material 13 has a lower thermal conductivity than metals such as aluminum, and is less affected by the temperature difference between the ambient temperature and the inside of the showcase 1, thus greatly suppressing condensation. The resins that can be used include polyvinyl chloride, acrylic resin, ABS resin, polystyrene, polyurethane, and glass fiber reinforced plastic, as well as other resin materials known in relation to the aforementioned binders. Furthermore, making the frame 122 that constitutes the glass door out of resin, like the outer frame material, is also effective in suppressing condensation water C. [Examples]

[0026] This embodiment 2 is a diagram illustrating the relationship between the upper outer frame member 131 and the glass door 12 (and the frame 122 that constitutes it) from the right outer frame member 134 side, and Figure 8 is a schematic diagram showing the actual relationship between the upper outer frame member 131 and the glass door 12 (and the frame 122 that constitutes it). It is also a schematic diagram showing the glass door 12 and the synthetic resin outer frame member 13 in the showcase 1, and the glass door 12 is composed of a glass plate 121 and a frame 122 into which the glass plate 121 is fitted. The surface of the outer frame material 13 is composed of an inner surface 13a facing the glass door and an outer surface 13b not facing the glass door, indicating that the upper outer frame material 131 is composed of an inner surface 131a and an outer surface 131b. Figure 9 is a schematic cross-sectional view showing the groove M1 and the diffusion of water droplets in Figure 8. A V-shaped groove M1 is formed on the inner frame surface 131a, which is continuous in the vertical direction. By forming a hydrophilic film layer L on the groove M1, the condensed water C spreads across the surface of the hydrophilic film layer L and forms a water film F. As a result, the condensed water C diffuses rather than aggregates, preventing the formation of water droplets D, and thus preventing water droplets D from falling. The grooves M1 and protrusions M2 can have cross-sections such as a horizontal V-shape as shown in Figure 10(a), a vertical trapezoid as shown in (b), a convex cross-section as shown in (c), and a triangular cross-section as shown in (d). In addition, grooves M1 and protrusions M2 of various shapes can be formed, such as an isosceles triangle cross-section, a concave cross-section, and a rectangular cross-section. Although not shown in the figures, the hydrophilic film layer L is formed on the surface of these grooves M1 and protrusions M2, similar to Figure 9. The depth of each groove M1 is preferably 0.5 to 1 mm, and similarly, the height of each projection M2 is preferably 0.5 to 1 mm. The width of each groove M1 is preferably 0.5 to 1.5 mm, and similarly, the width of each projection M2 is preferably 0.5 to 1.5 mm. When the cross-sectional shape of the groove M1 or projection M2 is trapezoidal, it is sufficient to design it so that the upper and lower bases fall within the aforementioned ranges. For grooves M1 with an isosceles triangular cross-section, an equilateral triangular groove or a groove M1 with a 90-degree angle is preferred. In addition, for grooves M1 with an isosceles triangular cross-section, the angle can be 30° to 150°. Furthermore, the spacing between grooves M1 and between projections M2 is usually preferably 1.0 to 2.0 mm, and where the spacing is narrow, it is preferably about 0.5 to 1.0 mm. In this embodiment, Figure 9 shows a continuous groove M1 in the vertical direction, but as shown in Figures 10(a) to (e), the grooves M1 and protrusions M2 may not be continuous but formed at predetermined intervals. The shapes of these grooves M1 and protrusions M2 are not limited to just one type; two or more types may be combined. Examples of combinations include, as shown in Figure 10(e), a combination of uneven grooves M1 and protrusions M2, or a combination of the type, shape, and size of grooves M1 and the type, shape, and size of uneven protrusions M2. In Figures 10(a) to (e), only the upper outer frame member 131 is shown as the outer frame member 13. The hydrophilic film layer L only needs to be formed on at least the upper outer frame member 131, but it may also be formed on all outer frame members 13, both top, bottom, left, and right. Also, as shown in Figure 11, grooves M1 may be formed on the surface of the frame 122 that constitutes the glass door 12, and the hydrophilic film layer L may be formed on that surface. Although not shown, it is also conceivable that the surface of the frame 122 may have protrusions M2 instead of grooves M1. In Figures 10(a) to (e), only at least the vertical surface of the inner surface 131a of the outer frame member is shown, but it is also possible to form it on all outer frame members 13, both top, bottom, left, and right. The spacing A2 between grooves M1 and the spacing A1 between protrusions M2 should be within the range of the length of the horizontal and vertical parts of the passage H1. The outer frame material 13 is made of synthetic resin, and grooves M1 and protrusions M2 are formed on at least the vertical surface of the inner surface 131a of the outer frame material 13. The hydrophilic film layer L is formed on these, but the hydrophilic film layer L is formed to the extent that the grooves M1 and protrusions M2 are not filled, so that the hydrophilic film layer L follows the shape of the grooves M1 and protrusions M2, and thus the hydrophilic film layer L forms the grooves M1 and protrusions M2. Therefore, condensation water can flow in the left-right direction along the grooves M1 and protrusions M2. Next, the manufacturing method involves applying grooves M1 and protrusions M2 having the hydrophilic film layer L on their surface to the inner surface 131a of the outer frame material 13 in the left-right longitudinal direction. For example, the hydrophilic film layer L is applied to at least the vertical surface of the outer surface of the frame 122 that constitutes the door 12 of the outer frame material 13 using a roll coating method, spray coating method, brush coating, felt coating, etc., to form the hydrophilic film layer L along the grooves M1 and protrusions M2. This has the effect of preventing the condensation water C generated by condensation from flowing and diffusing in the left-right direction on the vertical surface of the inner circumferential surface 131a of the outer frame material 13 from accumulating in predetermined locations and forming water droplets D. Furthermore, the condensation water C generated by condensation is dispersed along the grooves M1 and protrusions M2 on the horizontal plane (upper and lower sides in parallel planes) of the inner circumferential surface 131a of the outer frame material 13, from the upper side to the lower side before the condensation water C becomes large, or the water droplets D generated by condensation are dispersed and flowed on the opposing inner and outer circumferential surfaces by placing them at a narrow gap H1 between the upper and lower sides, or by placing the protrusions M2 opposite each other (further narrowing the opposing gap H2) (Figures 8 and 11). Here, the grooves M1 and protrusions M2 with uneven shapes shown in Figures 14(a) and (b) are formed during the manufacturing process of the frame material 13 (131, 132, 133, 134) of the showcase 1 (in extrusion processes, uneven shapes are inevitably formed, especially at the corners of the passage H, so these can also be utilized). However, it is also possible to accurately form the grooves M1 and protrusions M2 with uneven shapes in the frame material 13 through processes such as extrusion, and then form the hydrophilic film layer L (hardened coating).

[0027] (experiment) Next, using Example 2, which consisted of a showcase 1 composed of a glass door 12 and a synthetic resin outer frame material 13, experiments 1 and 2 were conducted to confirm the effect of suppressing the dripping of condensation water C. In addition, as a comparative example to Example 2, an experiment was conducted in which water droplets were dropped using a dropper S onto a showcase with a groove M1 of the shape shown in Figure 9, but without a hydrophilic film layer (which is a hardened coating) L (Figure 12(a)(b)). In Example 2 of Experiment 1, a hydrophilic film layer (a hardened coating) L was formed on the surface side of the uneven grooves M1 and protrusions M2 of the comparative example. In Example 2, most of the water droplets dropped with the dropper S diffused in the direction of flowing left to right on the vertical section (Figure 12(a)). On the other hand, in the comparative example, most of the water droplets dropped with the dropper S did not diffuse left to right on the vertical section, resulting in the water droplets D falling from the top to the bottom (Figure 12(b)). This is thought to be due to the following reasons (1) and (2). Reason (1) is that, in this embodiment 2, a hydrophilic film layer L including the grooves M1 and protrusions M2 is formed on the inner surface 113a of the outer frame material 13 and the outer surface 112a of the frame 122, and a water film F spreads across the surface of the hydrophilic film layer L, thereby suppressing the aggregation of condensation water C produced by condensation into water droplets D. Even if the condensation water C flows downward, it flows and diffuses to the left and right at the location of the grooves M1 and protrusions M2 on which the hydrophilic film layer L is formed (Figures 12(a), 13(b)). This is thought to be because when condensation water C adheres to the grooves M1 and protrusions M2, the condensation water flows away due to capillary action. Furthermore, on the surface of the grooves M1, a hydrophilic film layer L is formed, and when condensation water C adheres to the hydrophilic film layer L, the condensation water C becomes more familiar with the hydrophilic film layer L, making capillary action more likely to occur, and thus the condensation water spreads further in the left and right directions. The grooves M1 and protrusions M2 may be provided at predetermined equal intervals, but the spacing may be narrowed downwards, the size of the grooves M1 and protrusions M2 may be increased, or their number may be increased. This is to increase the diffusion of condensation water C that diffuses in the left-right direction. Furthermore, grooves M1 with a V-shaped cross-section and protrusions M2 with a triangular cross-section are preferred. This is thought to facilitate the formation of a hydrophilic film layer (a hardened coating) L. [Industrial applicability]

[0028] Although the embodiments of the present invention described above were explained based on a refrigerated display case 1, the present invention can be used not only for refrigerated display cases but also for freezer display cases, building window frames and glass windows, and in any situation where it is necessary to suppress the falling of condensation water C, which is generated by temperature differences, as water droplets D. [Explanation of symbols]

[0029] 1 (refrigerated) display case, 11 cabinets, 12 glass doors, 121 glass plate, 122 stile, 13 Outer frame material, 131 Upper outer frame material, 131a Inner side of the outer rib, 131b Outer surface of upper outer rib 132 Lower outer purlin, 133 Left outer purlin, 134 Right outer purlin, C. Condensation D water droplets F water film, H, H1, H2 pathways H1 horizontal channel width interval, H2, vertical channel width interval, L Hydrophilic film (coating, hardened coating), T Hydrophilic film M1 groove, M2 protrusion

Claims

1. An outer frame material for a door that separates a first space and a second space, and an outer frame material that holds the door so that it can be opened and closed, wherein the outer frame material is arranged with a passage so as to surround the frame that constitutes the door, and is composed of an inner surface of the outer frame material that faces the frame side and an outer surface of the outer frame material that does not face the frame side, and a hydrophilic film layer, which is a coating of a hydrophilic material, is formed on the inner surface that constitutes the outer frame material.

2. The outer frame material for a door according to claim 1, characterized in that the binder component, which plays a role in improving the adhesion between the hydrophilic film layer and the outer frame material which is the base material, is at least one ultraviolet-curing resin selected from monofunctional acrylate, difunctional acrylate, polyfunctional acrylate, and urethane acrylate.

3. The outer frame material for a door according to claim 1, characterized in that grooves or protrusions having the hydrophilic film layer on their surface are formed on the vertical surface of the inner surface of the outer frame material in the left-right longitudinal direction of the vertical surface, and condensation water generated by condensation flows in the left-right direction on the vertical surface of the inner surface of the outer frame material.

4. The outer frame material for a door according to claim 1, characterized in that the hydrophilic film having a hydrophilic film layer is a coating formed by applying a hydrophilic material to the other side of a film on which one side is an adhesive surface, is attached to at least the inner surface constituting the outer frame material.

5. The outer frame material for a door according to claim 1, characterized in that grooves or protrusions having the hydrophilic film layer on their surface are formed in the left-right longitudinal direction of the vertical surface of the outer frame of the door constituting the frame of the outer frame material, thereby allowing condensation water generated by condensation to flow in the left-right direction on the vertical surface of the outer surface of the outer frame of the outer frame material.

6. The outer frame material for a door according to claim 1, characterized in that grooves or protrusions having the hydrophilic film layer on their surface are formed opposite each other at positions on the inner surface of the outer frame material and the outer surface of the frame constituting the door, thereby allowing condensation water generated by condensation to flow in the left-right direction to the inner surface of the outer frame material and / or to flow in the left-right direction to the outer surface constituting the frame of the outer frame material.

Images