JP6232578B2 - Insulated door - Google Patents

Description

  The present invention relates to a heat insulating door used for a refrigerator door or the like.

  In recent years, in order to improve the design of a refrigerator door, a door front plate (outer plate) made of a glass plate has appeared (for example, see Patent Document 1).

  Hereinafter, the heat insulating door of the conventional refrigerator disclosed in Patent Document 1 will be described with reference to the drawings.

  FIG. 8 is a perspective view of a heat insulating door of a conventional refrigerator, and FIG. 9 is a cross-sectional view of the heat insulating door of the conventional refrigerator.

  As shown in FIG. 8 and FIG. 9, the heat insulating door of the conventional refrigerator includes a colored glass plate 101 as an outer plate having a transparent layer 101 a on the front surface and a colored layer 101 b melted and colored on the back surface, and the colored glass plate 101. A space surrounded by a frame body 102 provided on the periphery, an inner plate 103 arranged to face the colored layer 101b side surface of the colored glass plate 101, and the colored glass plate 101, the frame body 102, and the inner plate 103 And rigid urethane foam 104 filled with foam.

  The frame body 102 has a glass plate insertion portion 102 a having a substantially U-shaped cross section for inserting the outer peripheral end portion of the colored glass plate 101, and the outer peripheral end portion of the colored glass plate 101 is inserted into the glass plate of the frame body 102. Inserted into the portion 102a, both front and rear surfaces are clamped (held). The colored glass plate 101 is integrally foamed with the rigid urethane foam 104.

  The heat insulating door of the conventional refrigerator configured as described above has the following effects.

  1. The colored glass plate 101 gives a gloss to the front plate (outer plate) of the heat insulation door, and the gloss can be deepened to increase the texture. Compared with the metal or resin pre-painting plate, There is an advantage that the design of the front plate (outer plate) is improved.

  2. Since the front plate (outer plate) of the door is composed of the colored glass plate 101, it is easy to ensure the rigidity of the front plate (outer plate), and it is not necessary to add a reinforcing plate to the back side of the colored glass plate 101. The occurrence of unevenness on the front surface of the door due to foam filling of the rigid urethane foam 104 can be suppressed.

  3. The external force applied to the front plate (outer plate) of the door made of the colored glass plate 101 can be absorbed to some extent because the hard urethane foam 104 functions as a cushioning material, and there is an effect that the colored glass plate 101 is hardly broken by the external force.

JP-A-5-133777

  However, since the conventional heat insulating door fixes the colored glass plate 101 to the frame body 102 by fitting the outer peripheral end of the colored glass plate 101 into the glass plate insertion portion 102a of the frame body 102, the colored glass plate The front edge of the glass plate insertion portion 102a that covers the outer peripheral edge of the front surface of the 101 from the front is exposed around the front surface of the glass plate 101, and the design that is improved using the bent glass plate 101 is impaired. there were.

  Further, fine dust or the like adheres and accumulates at the boundary between the front edge of the glass plate insertion portion 102a and the colored glass plate 101, and the fine dust or the like that adheres and accumulates is wiped off. However, it cannot be completely wiped off and begins to appear linearly along the front edge of the glass plate insertion portion 102a.

  If the coloring of the colored glass plate 101 is white, this phenomenon starts to become noticeable after a short period of use, and becomes more noticeable as the use period becomes longer. This causes a problem that the beauty of the refrigerator is greatly impaired.

In addition, the conventional heat insulating door uses the hard urethane foam 104 as a heat insulating material. However, with the recent increase in awareness of power saving, the heat insulating material for the heat insulating door is compatible with power saving in a storage that cools and heats the interior of a refrigerator or the like. There is a need for further improvement of the heat insulation performance.

  In view of the above-described conventional problems, an object of the present invention is to provide a heat insulating door excellent in heat insulating performance and design.

In order to achieve the above object, the present invention provides a heat insulating material in which a vacuum heat insulating material is disposed in a space formed by an outer plate, an inner plate, and a frame, and a hard urethane foam is foam-filled in the space other than the vacuum heat insulating material. The outer plate is a door, and the front surface exposed to the outside is formed of a glass plate, and the vacuum heat insulating material is disposed closer to the inner plate than the middle between the outer plate and the inner plate, or the vacuum heat insulating material. Is fixed to the inner plate, and the front end of the frame body does not protrude forward from the front surface of the outer plate made of the glass plate, and the entire front surface of the outer plate made of the glass plate is exposed to the outside. The outer plate is fixed using the adhesive force of rigid urethane foam , and the vacuum heat insulating material is formed by covering the plate-shaped core material with a jacket material and sealing under reduced pressure. A fin portion composed only of the jacket material without any material in between. Then, the fin portion is folded and fixed so as to overlap the sealed portion of the core material, and the vacuum heat insulating material is fixed to the inner plate with the surface having the folded fin portion facing the inner plate side. It is a thing.

  The heat insulating door having the above structure uses an outer plate made of a glass plate with a front surface exposed to the outside and a vacuum heat insulating material, and the front end of the frame body projects forward from the front surface of the outer plate made of a glass plate. Since the entire surface of the front surface of the outer plate made of a glass plate is exposed to the outside, the heat insulating performance and the design are excellent.

In addition, even when the entire front surface of the outer plate made of glass is exposed to the outside, the outer plate made of glass plate can be removed using the adhesive force of hard urethane foam. Since it can be prevented with high reliability over a long period of time, excellent design properties can be maintained over a long period of time.
In addition, since the vacuum heat insulating material is fixed to the inner plate with the folded fin portion of the vacuum heat insulating material facing the inner plate side, the rigid urethane foam that flows while foaming at a high temperature is folded. It does not act so as to peel off the portion where the fin portion is bonded and fixed, and the bonded and fixed state of the folded fin portion can be maintained for a long time.

  The heat insulating door of the present invention uses an outer plate made of a glass plate on the front surface exposed to the outside and a vacuum heat insulating material, and the front end of the frame body projects forward from the front surface of the outer plate made of a glass plate. Since the entire surface of the front surface of the outer plate made of a glass plate is exposed to the outside, the heat insulating performance and the design are excellent.

  In addition, even when the entire front surface of the outer plate made of glass is exposed to the outside, the outer plate made of glass plate can be removed using the adhesive force of hard urethane foam. Since it can be prevented with high reliability over a long period of time, excellent design properties can be maintained over a long period of time.

External appearance perspective view of the refrigerator using the heat insulation door in Embodiment 1 of this invention Cross section of the refrigerator Perspective view showing one of the doors of the refrigerator Exploded perspective view of the refrigerator door Schematic cross-sectional view of the refrigerator door Main part longitudinal cross-sectional view which shows the longitudinal cross-section of the lower part of the door of the refrigerator Schematic cross-sectional view of a heat insulating door showing a reference example of the present invention Perspective view of conventional refrigerator heat insulation door Cross-sectional view of conventional refrigerator heat insulation door

1st invention is the heat insulation door which arrange | positioned the vacuum heat insulating material in the space formed by an outer plate, an inner plate, and a frame, and foam-filled the hard urethane foam in the space other than the vacuum heat insulating material, The outer plate is formed of a glass plate with a front surface exposed to the outside, and the vacuum heat insulating material is disposed closer to the inner plate than an intermediate between the outer plate and the inner plate, or the vacuum heat insulating material is disposed on the inner plate. The outer plate is fixed so that the entire front surface of the outer plate made of the glass plate is exposed to the outside without protruding the front end of the frame body forward from the front surface of the outer plate made of the glass plate. Is fixed by using the adhesive force of rigid urethane foam, and the vacuum heat insulating material is formed by covering a plate-shaped core material with an outer cover material and sealing it under reduced pressure, and includes the core material around the core material. The fin portion is composed only of the jacket material, and the fin portion is Thermal insulation core material folded back and fixed so as to overlap the sealing portion, the surface on which there is a fin portion folded back toward the inside plate side, characterized in that said vacuum heat insulator is fixed to the inner plate It is a door.

  In the above configuration, the outer plate is made of a glass plate with the front surface exposed to the outside, and the entire front surface of the outer plate made of the glass plate is exposed to the outside. A clean and clean appearance can be achieved.

  In addition, the frame body does not protrude forward from the front surface of the outer plate made of a glass plate at the front end of the frame body, and does not have a structure corresponding to a conventional glass plate insertion portion. Dust adheres to and accumulates at the boundary between the front edge (glass face side) edge of the glass plate insertion portion and the glass plate covering the outer peripheral edge from the front, and this remains linearly along the edge. It will not stand out.

  In addition, when wiping off fine dust adhered to the glass surface exposed to the outside in the outer plate, there is no unevenness that obstructs the wiping work on the glass surface to be wiped off, so fine dust etc. It can be wiped cleanly without leaving any wiping, and it is excellent in cleanability and can maintain the initial high designability (appearance excellent in aesthetics) as it is over a long period of time.

  In addition, since the vacuum insulation material, which has a heat insulation performance approximately 20 times that of rigid urethane foam, is generally made into a multi-layered structure together with the rigid urethane foam, it is provided in the insulated door, so that the rigid urethane foam is used as the insulation material for the insulated door. Excellent heat insulation performance than conventional heat insulation doors using only

  In addition, in order to fix the outer plate using the adhesive force of the hard urethane foam without providing a structure for holding the outer plate in the frame body, the adhesive force of the hard urethane foam to the outer plate is the fixing (holding) of the outer plate. It is necessary that the adhesive strength is sufficient.

  In the process of foam filling of hard urethane foam of a general heat insulating door, first, the heat insulating door before filling the hard urethane foam is installed in the foam jig with the outer plate side down, and then the outer plate and A stock solution of rigid urethane foam is injected into a space surrounded by the inner plate and the frame.

  The stock solution of the hard urethane foam injected into the internal space of the heat insulating door flows down to the back surface of the outer plate serving as the bottom of the space, and then flows while filling with foaming at a high temperature.

If voids are generated without filling with rigid urethane foam, or if there is a variation in density due to location in the rigid urethane foam before curing, the variation in the pressure of foam filling of rigid urethane foam due to location Occurs.

  Also, after foaming of rigid urethane foam performed at high temperature, due to the difference in shrinkage due to temperature decrease of each member of outer plate, rigid urethane foam, vacuum heat insulating material, frame body, inner plate (void of void (void) ), The air pressure in the unfilled space (void) is also affected by the decrease in air pressure), and the force adjacent to the rigid urethane foam exceeds the adhesive strength of the rigid urethane foam. When it is going to work, the adhesion part with hard urethane foam will partly peel off, or adhesive strength will fall.

  At this time, if the rigidity of the outer plate is insufficient, the outer plate may be deformed or the glass plate used for the outer plate may be broken.

  And if the glass plate used for the outer plate is thickened to increase the rigidity of the outer plate so that the outer plate is not deformed due to insufficient rigidity of the outer plate or the glass plate used for the outer plate is not broken, When using a heat-insulating door that increases in weight and the glass surface of the outer plate is approximately parallel to the vertical direction (the glass surface of the outer plate is the front surface), the outer plate peels off the rigid urethane foam due to the weight of the outer plate. The balance between the acting force and the adhesive force of the hard urethane foam to the outer plate is deteriorated, and the risk that the outer plate is peeled off from the hard urethane foam due to the weight of the outer plate is increased.

  Generally, a vacuum heat insulating material is formed by covering a plate-shaped core material with a jacket material and sealing it under reduced pressure, and does not include a core material between the jacket materials around the core material, and is a fin composed only of the jacket material. Has a part.

  And since the fin part of a vacuum heat insulating material tends to cause the void | void (void) generation | occurrence | production which prevents the fluidity | liquidity of the rigid urethane foam which flows while foaming at high temperature, it overlaps with the part by which the core material was sealed. Folded part or adhesive part in a state where the hard urethane foam that flows while foaming at high temperature with adhesive such as hot melt, double-sided adhesive (adhesive) sheet, single-sided adhesive (adhesive) tape, etc. Even if it acts on it, it is used by adhering and fixing so that the fin portion is folded back.

  Also, when placing the vacuum heat insulating material in close contact with the outer plate or the inner plate, such as hot melt so that the placement position of the vacuum heat insulating material does not move by the rigid urethane foam that flows while foaming at high temperature The vacuum heat insulating material is fixed to the outer plate or the inner plate with an adhesive, a double-sided adhesive (adhesive) sheet, a single-sided adhesive (adhesive) tape, or the like.

  In addition, when placing the vacuum heat insulating material in a floating state so that the rigid urethane foam is filled between the outer plate and the vacuum heat insulating material and between the inner plate and the vacuum heat insulating material, An intermediate floating member is required between any one of the inner plate, the frame, and the vacuum heat insulating material.

  And the vacuum heat insulating material, the adhesive fixing means of the vacuum heat insulating material, and the intermediate floating member deteriorate the fluidity of the hard urethane foam that flows while foaming at a high temperature. Voids that are not filled are easily generated.

  As described above, since a void (void) that is not filled with the rigid urethane foam is likely to occur around the vacuum heat insulating material, the adverse effect on the outer plate due to the void (void) generation of the rigid urethane foam is reduced. It can be seen that the vacuum heat insulating material is better separated from the outer plate than arranged close to the outer plate.

  In addition, when the vacuum heat insulating material is disposed so as to be in close contact with the outer plate, when the heat transfer surface of the vacuum heat insulating material is smaller than the area of the outer plate, a portion where the outer plate and the hard urethane foam are in close contact with each other, A portion where a vacuum heat insulating material is interposed between the rigid urethane foam is formed.

  And for the part where the outer plate and the hard urethane foam are in close contact, the adhesive force of the hard urethane foam to the outer plate acts on the force that holds the outer plate, but there is a vacuum heat insulating material between the outer plate and the hard urethane foam. For the intervening portion, both the adhesive force of the adhesive fixing means between the outer plate and the vacuum heat insulating material and the adhesive force of the rigid urethane foam to the vacuum heat insulating material act on the force for holding the outer plate.

  Therefore, in the part where the vacuum heat insulating material is interposed between the outer plate and the rigid urethane foam, the force to hold the outer plate is weaker than the adhesive force of the adhesive fixing means between the outer plate and the vacuum heat insulating material. It becomes weaker than the adhesive strength of rigid urethane foam to the heat insulating material. Further, the adhesive force of the hard urethane foam to the vacuum heat insulating material is more likely to vary than the adhesive force of the hard urethane foam to the outer plate.

  Moreover, in the jig preheating process before foaming of rigid urethane foam, in order to increase the fluidity and foaming efficiency of the rigid urethane foam that flows while foaming at a high temperature, it is adjacent to the rigid urethane foam by heating means provided in the foaming jig. Although the surface temperature of the member is raised to a predetermined temperature, the surface on the opposite side of the surface that is susceptible to heating by the heating means in the vacuum heat insulating material is not easily raised due to the high heat insulating performance of the vacuum heat insulating material. .

  And if there is a heating means in the foaming jig adjacent to the outer plate and the vacuum heat insulating material is arranged so as to be in close contact with the outer plate, the high heat insulating performance of the vacuum heat insulating material will affect the inner part of the vacuum heat insulating material. Since the surface temperature of the surface facing the plate is lower than the predetermined temperature, the adhesive force of the hard urethane foam to the vacuum heat insulating material is deteriorated.

  Therefore, when the vacuum heat insulating material is disposed so as to be in close contact with the outer plate, the force for holding the outer plate is lower than when the hard urethane foam is interposed between the outer plate and the vacuum heat insulating material.

  Also, in order to make the glass plate used for the outer plate difficult to break due to external impact, the inner side of the outer plate is a relatively soft cushioning material that absorbs and disperses external impact force on the outer plate. Therefore, if the vacuum insulation material is harder than the hard urethane foam, it is preferable to place the vacuum insulation material in close contact with the outer plate. When the hard urethane foam is interposed between the glass plate and the glass plate used for the outer plate, it is more difficult to break due to an external impact.

  In addition, in the case where the vacuum heat insulating material is disposed so as to be in close contact with the outer plate, when the portion where the outer plate and the hard urethane foam are in close contact with each other, or when the surface of the vacuum heat insulating material in close contact with the outer plate is uneven When the fin portion of the vacuum heat insulating material is folded back to the surface facing the outer plate, the portion that receives the impact force from the outside on the outer plate on the inner side of the outer plate is likely to concentrate on the local portion.

  And if the part that receives the impact force from the outside against the outer plate is concentrated on the inside of the outer plate, the glass plate used for the outer plate is easily broken by the impact from the outside, so vacuum is applied so that it adheres to the outer plate. It is not preferable to arrange a heat insulating material.

  Further, in the case where the vacuum heat insulating material is disposed so as to be in close contact with the outer plate, the vacuum heat insulating material is formed of a laminated film having a metal foil such as an aluminum layer or a vapor deposition layer obtained by evaporating a metal such as aluminum. It is covered with two outer jacket materials and sealed under reduced pressure, and has a fin portion composed only of the outer jacket material without including the core material between the outer jacket materials. When the fin part of the material is folded back to the surface facing the inner plate, the heat transferred from the outer plate to the vacuum heat insulating material is transferred from the outer jacket material that is in close contact with the outer plate to the fin part, and the fin part is connected to the inner plate. Since it is folded back to the opposing surface side, it is transmitted to the portion of the fin portion that faces the inner plate, so that the high heat insulating performance of the vacuum heat insulating material cannot be sufficiently exhibited.

  In addition, the vacuum heat insulating material is covered with two outer cover materials made of a laminated film having a metal film such as a vapor deposition layer or a metal foil such as an aluminum foil on which a plate-like core material is deposited, such as aluminum, and is vacuum-sealed. If the core material has a fin portion that is composed only of the outer cover material without including the core material between the outer cover materials, and if the outer cover materials of the fin portion are heat-welded, vacuum insulation As the installation environment of the material is higher, the gas (air) outside the vacuum heat insulating material is more likely to enter the inside of the vacuum heat insulating material from a portion where the outer cover material or the outer cover materials are thermally welded.

  Since the vacuum insulation material has a lower thermal insulation performance as the internal vacuum level decreases (internal pressure increases), the installation environment of the vacuum insulation material is low in order to maintain the high thermal insulation performance of the vacuum insulation material over a long period of time. Is more preferable.

  In the present invention, the vacuum heat insulating material is disposed closer to the inner plate than the middle between the outer plate and the inner plate, or the vacuum heat insulating material is fixed to the inner plate, so the vacuum heat insulating material is disposed outside the middle between the outer plate and the inner plate. Rather than the case where it is placed closer to the plate or the vacuum insulation is fixed to the outer plate, the outer plate is fixed by the adhesive force of the hard urethane foam that is provided in the heat insulation door with the vacuum insulation material in a multilayer structure together with the hard urethane foam. (Retention) It is possible to reduce the influence of the decline in function, it is possible to thin the glass plate used for the outer plate, so that the entire front surface of the outer plate made of glass plate is exposed to the outside, The outer plate can be fixed using the adhesive force of the hard urethane foam, and the outer plate can be fixed (held) using the adhesive force of the hard urethane foam over a long period of time.

  Therefore, the heat-insulating door of the present invention uses the outer plate made of a glass plate and the front surface exposed to the outside and a vacuum heat insulating material, and the front end of the frame body is ahead of the front surface of the outer plate made of a glass plate. Since it has a structure in which the entire front surface of the outer plate made of a glass plate is exposed to the outside without protruding, it has excellent heat insulation performance and design.

  In addition, even when the entire front surface of the outer plate made of glass is exposed to the outside, the outer plate made of glass plate can be removed using the adhesive force of hard urethane foam. Since it can be prevented with high reliability over a long period of time, excellent design properties can be maintained over a long period of time.

Furthermore, in the present invention, the vacuum heat insulating material is formed by covering a plate-shaped core material with a jacket material and sealing it under reduced pressure, and is composed of only the jacket material without including the core material around the core material. The fin portion is folded and fixed so as to overlap the sealed portion of the core, and the surface with the folded fin portion is directed toward the inner plate, and the vacuum heat insulating material is Ru fixed Tei in said plate.

In this way, the fin portion around the core material of the vacuum heat insulating material is folded back so as to overlap the sealed portion of the core material, for example, an OPP tape (polypropylene) excellent in water resistance and moisture resistance mainly used for packaging. Fix the material with a stretched polypropylene tape that has been made into a transparent film by melt extrusion molding and coated with adhesive, etc., with the folded fin part facing the inner plate side and fixing the vacuum heat insulating material to the inner plate, Since the rigid urethane foam that flows while foaming at a high temperature does not act so as to peel off the portion where the folded fin portion is bonded and fixed, the bonded and fixed state of the folded fin portion can be maintained for a long period of time.

Further , the vacuum heat insulating material is a plate-shaped core material covered with a jacket material and sealed under reduced pressure, and has a fin portion formed only of the jacket material without including the core material around the core material. The fin portion is folded back so as to overlap the sealed portion of the core and fixed with a hot melt adhesive, and the rigid urethane foam that flows while foaming at a high temperature has the folded fin portion. When acting to peel off the bonded and fixed portion, the bonded and fixed portion is less likely to be peeled compared to other bonding and fixing means.

  Hereinafter, embodiments of the heat insulating door of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
1 is an external perspective view of a refrigerator using a heat insulating door in Embodiment 1 of the present invention, FIG. 2 is a sectional view of the refrigerator, and FIG. 3 is a perspective view showing one of the doors of the refrigerator, 4 is an exploded perspective view of the door of the refrigerator, FIG. 5 is a schematic cross-sectional view of the door of the refrigerator, and FIG. 6 is a vertical cross-sectional view of a main part showing a vertical cross section of the lower part of the door of the refrigerator. .

  In FIG. 1 and FIG. 2, the heat insulation box which comprises the refrigerator main body 1 is a metal (for example, iron plate) outer box 2 opening forward, a hard resin (for example, ABS) inner box 3, and these outer boxes. 2 and a rigid urethane foam 4 filled with foam between the inner box 3 and the inner box 3.

  The refrigerator main body 1 has a refrigerator compartment 5 at the top, a switching chamber 6 located below the refrigerator compartment 5, an ice making chamber 7 arranged next to the switching chamber 6, a switching chamber 6, and an ice making chamber 7. The freezer compartment 8 is located at the bottom of the freezer compartment, and the vegetable compartment 9 is located below the freezer compartment 8.

  The front face of the refrigerator compartment 5 is closed freely by, for example, double doors 10 and 10, and the front parts of the switching compartment 6, the ice making compartment 7, the freezer compartment 8, and the vegetable compartment 9 are respectively drawn out doors 11. , 12, 13, and 14 are freely closed.

  A cooling chamber 16 is provided in the back of the freezing chamber 8. The cooling chamber 16 is provided with a cooler 17 that generates cool air by heat exchange with the surrounding air, and a blower fan 18 that supplies the cool air to each chamber.

  Further, a compressor 19 is provided at the back of the top surface of the main body of the refrigerator main body 1. A compressor 19, a condenser (not shown), a heat radiating pipe 20, a capillary tube 21, and a cooler 17 are sequentially connected in an annular shape, and a refrigerant is enclosed therein, thereby refrigeration cycle. Is configured.

  This refrigeration cycle is configured to perform a cooling operation, and the high-temperature and high-pressure gas refrigerant discharged from the compressor 19 is condensed by a condenser (not shown) and a heat radiating pipe 20 and decompressed by a capillary tube 21 to be cooled. The heat is exchanged with the air around the cooler 17 in the cooler 17 and vaporized, and the process returns to the compressor 19.

  Here, each of the doors 10 to 14 is, like the refrigerator body 1, foamed and filled with hard urethane foam in the internal space to provide heat insulation, and in order to further improve the design, The front surface of the plate is composed of a glass plate.

  Hereinafter, the structure of the door 10 will be described with reference to FIGS. In addition, since the doors 11-14 other than the door 10 are also the same structure, the description is abbreviate | omitted.

  3-6, the inner board 23 will be located in the back side (inner side of the refrigerator main body 1) of the door 10, and is vacuum-formed, for example with ABS resin. The frame body 24 is an edge frame that is coupled and fixed to the peripheral end face of the inner plate 23 and is formed of ABS resin. A front plate (outer plate) 25 made of a glass plate is laminated in front of the frame body 24 so as to face the inner plate 23 at a predetermined interval from the inner plate 23. In the present embodiment, the front plate 25 is glossy. A tempered glass plate is used.

  As shown in FIGS. 5 and 6, the glass plate 25 has a resin film 27 attached to the back surface via a transparent adhesive 26. The resin film 27 is provided with a colored layer 28 made of a metallic pattern such as a picture pattern, for example, a hairline. Thereby, the glass plate 25 becomes a glass plate with a colored layer.

  In the present embodiment, the resin film 27 having the colored layer 28 is attached to the back surface of the glass plate 25 via the transparent adhesive 26, but multilayer silk screen printing or other means is applied to the back surface of the glass plate 25. You may decorate with.

  The resin film 27 is made of polyethylene terephthalate having high transparency and high mechanical strength in the present embodiment, and the colored layer 28 is formed on the side opposite to the glass plate 25 in the white system, and on the glass plate 25 side in the gray system. It is formed. In the drawing, the case where it is formed on the side opposite to the glass plate 25 is shown.

  In addition, when emphasizing the hairline three-dimensionally, a concave and convex groove is provided on the surface of the resin film opposite to the colored layer formed on the glass plate 25 side to form a three-dimensional hairline on the surface. A chromium deposition layer is formed.

  As a result, the design properties can be improved, and by using chromium as the material of the vapor deposition layer, rust generation of the vapor deposition layer starting from the end surfaces of the film and the vapor deposition layer can be prevented, and the durability of the pattern is improved. .

  The hard urethane foam 29 has a vacuum heat insulating material 30 in a space formed by the surface (back surface) of the glass plate 25 on the resin film 27 side, the inner plate 23 and the frame body 24 (the vacuum heat insulating material 30 is substantially the same as the inner plate 23). After placement, the space other than the vacuum heat insulating material 30 is filled with foam.

  Here, the vacuum heat insulating material 30 has a metal layer such as an aluminum foil or a metal foil such as a vapor deposition layer obtained by vapor-depositing a metal such as aluminum on a plate-like core material 31 made of a fiber aggregate such as glass wool. The core material 31 is covered with two jacket materials 32 made of a laminate film and sealed under reduced pressure between the two jacket materials 32, and the core material 31 is sandwiched between the jacket materials 32 around the core material 31. In other words, the fin portion 33 is formed only of the jacket material 32.

  It should be noted that the outer covering material 32 of the fin portion 33 is such that the gas (air) outside the vacuum heat insulating material 30 does not easily enter the inside of the vacuum heat insulating material 30 (the space in which the core material is sealed by the outer covering material 32). They are heat welded together.

  Further, the fin portion 33 is folded back so as to overlap the sealed portion of the core member 31, and is fixed so as to maintain the folded state from the folded fin portion 33 with the double-sided tape 34 or the single-sided adhesive tape. The surface with the fin portion 33 faces the inner plate 23 side, and the vacuum heat insulating material 30 is fixed to the inner plate 23 with a double-sided tape 34.

  Note that the double-sided tape 34 that bonds the vacuum heat insulating material 30 and the inner plate 23 is located in the gap between the vacuum heat insulating material 30 and the inner plate 23 if the portion of the inner plate 23 where the vacuum heat insulating material 30 is substantially in close contact is substantially flat. Provided on the entire circumference of the surface of the vacuum heat insulating material 30 facing the inner plate 23 (or substantially the entire surface of the vacuum heat insulating material 30 facing (adhering to)) so that the hard urethane foam 29 does not enter. Is preferred.

The rigid urethane foam 29 is adhered to the resin film 27 (with the colored layer 28 formed) attached to the back surface of the glass plate 25 together with the vacuum heat insulating material 30, the inner plate 23 and the frame body 24 by foaming, The glass plate 25 is bonded and held via the resin film 27.

  In the present embodiment, before foaming and filling the hard urethane foam 29, the surface (rear surface) of the glass plate 25 on the side of the resin film 27 so that the predetermined positional relationship between the glass plate 25 and the frame body 24 can be maintained. The end surface 24 a on the front surface side of the frame body 24 is bonded with a double-sided tape 35.

  Further, the frame body 24 does not have the glass plate insertion portion as described in the conventional example, and the outer peripheral end of the glass plate 25 is the same as the end surface 24a on the front side of the frame body 24 as shown in FIG. In this embodiment, it is configured to be located slightly inside.

  Moreover, in this Embodiment, as shown in FIG. 5, the corner | angular of the front side is chamfered among the two front and back corners of the four sides of the rectangular glass plate 25, and the lower end of the frame body 24 has the glass plate 25. A glass plate support protrusion 24 b protruding forward from the back surface is provided, and the glass plate support protrusion 24 b is configured to support the weight of the glass plate 25.

  The glass plate support protrusion 24b is not protruded forward from the front surface of the outer plate formed of the glass plate 25, and the front end of the glass plate support protrusion 24b is positioned rearward of the chamfered portion of the outer peripheral edge of the glass plate 25. ing.

  In the above-described configuration, the refrigerator door 10 has a colored layer 28 made of a metallic pattern such as a hairline located inside the transparent layer made of the glass plate 25 and the resin film 27. The design is greatly improved compared to a pre-painted plate made of metal or resin.

  In particular, in the present embodiment, since the colored layer 28 is formed on the resin film 27, the colored layer 28 can be formed on the resin film 27 by a roller or the like, and a fine pattern such as a hairline can also be formed. It can be improved significantly.

  Further, since the colored layer 28 can be formed on the resin film 27 by a roller or the like, the adhesive strength to the resin film 27 can be managed and guaranteed, and the adhesive state due to heat shrinkage or aging of the hard urethane foam 29 can be ensured. Even if the deterioration occurs, the resin film 27 can be prevented from being peeled off.

  As a result, when the resin film 27 is positioned between the glass plate 25 and the hard urethane foam 29, and both of them are adhered by the adhesive force of the hard urethane foam 29 and the adhesive 26, the colored layer 28 becomes the resin film 27. It is possible to prevent the glass plate 25 from being peeled off from the hard urethane foam 29 due to the peeling.

  Therefore, it is possible to maintain and guarantee the adhesive strength of the glass plate with film 25 over a long period of time, and to ensure reliability.

  In the present embodiment, since the foam density of the hard urethane foam 29 is higher in the outer peripheral portion of the glass plate 25 than in the central portion of the glass plate 25, the adhesive force of the hard urethane foam 29 is the glass plate 25. The outer peripheral portion is stronger than the central portion of the glass plate 25.

  Thereby, the adhesive force between the resin film 27 of the glass plate 25 and the hard urethane foam 29 can be more reliably maintained and guaranteed over a long period of time.

That is, the refrigerator has a large temperature difference between the inside and the outside, and the outer peripheral portion of the glass plate 25 of the door is more affected by condensation and more severe temperature change than the central portion of the glass plate 25 due to cold air from the inside when the door is opened and closed.

  Further, depending on the usage of the user, the door may be subjected to a violent impact when the door is opened or closed, or the door including the glass plate 25 may overflow with water or juice when the stored items are taken in or out.

  Due to the use environment and the actual situation peculiar to the refrigerator, the outer peripheral portion of the glass plate 25 is easily peeled off from the rigid urethane foam 29 if there is no glass plate insertion portion that covers the outer peripheral end of the glass plate.

  Under such circumstances, the outer peripheral portion of the glass plate 25 is bonded to the urethane skin layer in which the foaming density of the hard urethane foam 29 is high, that is, very finely foamed. The adhesion density with the resin film 27 on the back surface of the glass plate 25 is higher and stronger than the central portion of the glass plate 25.

  Therefore, even when used for a long period of time, adhesion between the resin film 27 on the back surface of the glass plate 25 and the rigid urethane foam 29 is ensured, and the adhesive strength of the glass plate 25 provided with the resin film 27 on the back surface is maintained for a long time. It can be guaranteed and reliability can be ensured.

  As a result of the life acceleration test, if the adhesive force between the resin film 27 provided on the back surface of the glass plate 25 and the hard urethane foam 29 is 1.0 g / cm 2 or more, preferably 2.6 g / cm 2 or more, the hard urethane is obtained. The adhesive strength between the resin film 27 and the hard urethane foam 29 can be ensured even if the adhesive strength is deteriorated due to secular change such as heat shrinkage of the foam 29. As a result, the hard urethane foam of the glass plate 25 is interposed via the resin film 27. It was found that the adhesion strength to 29 can be maintained and guaranteed over a long period of time.

  Here, the measurement of the adhesive force described above is based on “JIS K 6850 (Adhesive—Tensile Shear Adhesive Tensile Shear Adhesive Strength Test Method)”, which is a standard method for measuring the overlapping shear adhesive strength of an adhesive. Based on the method based on.

  Further, in the present embodiment, the resin film 27 is formed of a polyethylene terephthalate film, and since this polyethylene terephthalate has high mechanical strength, the film itself is torn due to secular change accompanying the heat shrinkage of the rigid urethane foam 29. It is possible to prevent the peeling of the adhesion of the resin film 27 from the torn portion to the rigid urethane foam 29 from progressing over time, and to ensure the reliability of the adhesion strength maintenance guarantee.

  On the other hand, since this door can eliminate the glass plate insertion part etc. which cover the outer periphery edge part of the conventional glass plate 25 by the maintenance guarantee of the said adhesive strength, it impairs designability like what has a glass plate insertion part. And a clean appearance with a flat feeling on the entire surface. Further, dust or the like is deposited and deposited on the boundary portion between the glass plate insertion portion and the glass plate 25, and this does not stand out linearly, and maintains the initial high designability as it is over a long period of time. be able to.

  In the present embodiment, the lower end of the frame body 24 is provided with a glass plate support protrusion 24 b that protrudes forward from the back surface of the glass plate 25, and the glass plate support protrusion 24 b supports the weight of the glass plate 25. In the unlikely event that the glass plate 25 is partially peeled off due to the deterioration of the adhesive strength of the glass plate 25 by the rigid urethane foam 29, the glass plate 25 An abnormal situation such as falling can be prevented, and the sense of security is greatly improved.

Further, the glass plate support protrusion 24b of the frame body 24 does not protrude forward from the front surface of the outer plate constituted by the glass plate 25, and does not cover the front surface of the outer plate constituted by the glass plate 25 from the front. Without being visible from the front of the door as in the glass plate insertion portion, the design and the flatness of the entire surface can be maintained as good. Needless to say, the dust non-adhesion effect does not change if the protrusions are so small that dust does not accumulate during wiping.

  In the present embodiment, the glass plate 25 is configured such that the outer peripheral end portion thereof is positioned slightly inside the front end surface 24 a of the frame body 24. The end surface 24a of the glass plate 25 is protected, and a force in the direction of peeling the glass plate 25 is hardly applied to the outer peripheral end portion of the glass plate 25.

  Therefore, for example, it is possible to prevent the outer peripheral end portion of the glass plate 25 from hitting a certain object and cracking at the time of transporting the door on the production line or the door replacement service at the user's house. That is, even if the glass plate insertion portion for holding the glass plate 25 is eliminated, the outer peripheral portion of the glass plate can be prevented from being damaged, and the force in the direction in which the glass plate 25 is peeled off from the outer peripheral end of the glass plate 25. Can be suppressed, and even if the glass plate 25 is used for the entire front plate (outer plate) of the door, the refrigerator can be used with peace of mind.

  Even if some external force is applied to the glass plate 25 and it should break, this glass plate piece is adhered to the resin film 27 to prevent scattering, and safety in the event of an emergency is also improved. To do.

  If a urethane adhesive or a polyester adhesive is applied in advance to the surface of the resin film 27 that contacts the hard urethane foam 29, the adhesive is applied to the surface of the resin film 27 that contacts the hard urethane foam 29. The adhesive force between the resin film 27 and the rigid urethane foam 29 can be increased as compared with the case where the above is not performed.

  A glass plate in which the foaming density of the hard urethane foam 29 is low and the substantial adhesion area between the hard urethane foam 29 and the resin film 27 is reduced by applying an adhesive in advance to the surface of the resin film 27 that contacts the hard urethane foam 29. The adhesive strength at the central portion of 25 can also be improved.

  In other words, the amount of foaming density of the rigid urethane foam 29 is low and the substantial adhesion area between the rigid urethane foam 29 and the resin film 27 is reduced, and the adhesive is applied to the surface of the resin film 27 that contacts the rigid urethane foam 29. The adhesive strength between the hard urethane foam 29 and the resin film 27 can be ensured more reliably, and as a result, the adhesive strength of the glass plate 25 can be maintained and guaranteed over a long period of time. Can be expensive.

  In addition, the adhesion surface between the resin film 27 and the rigid urethane foam 29 is a microscopic view in which the skin layer of the rigid urethane foam 29 and the resin film 27 are adhered to each other. Since both surfaces are smooth, there is a risk of peeling at once when peeling off.

  In particular, when the foam density of the outer peripheral portion of the glass plate 25 is increased and the adhesive surface with the glass plate 25 is used as a skin layer, there is a risk that peeling will spread at the outer peripheral portion of the glass plate 25.

  However, if an adhesive is interposed between the adhesive surface of the resin film 27 and the hard urethane foam 29, the adhesive strength between the resin film 27 and the hard urethane foam 29 becomes high, and the skin layer of the hard urethane foam 29 as described above. And the resin film 27 can be prevented from spreading.

  Urethane or polyester constituting the urethane-based or polyester-based adhesive has a solubility parameter (hereinafter referred to as SP value) of SP value 10-11 of urethane and SP value 11.3 of polyethylene terephthalate which is a film material. Therefore, the adhesive strength between them becomes stronger, and the maintenance of the adhesive strength is extremely high.

  In other words, the polyester-based (also acrylic-based) resin has a —OH group reacted with isocyanate at the end to form a urethane-modified resin film, while the urethane foam material is an isocyanate-cured polyether polyol. Therefore, although the basic resin skeleton is different, the reaction content is the same, so the adhesive strength is improved. Therefore, the adhesive strength of the glass plate 25 can be maintained and guaranteed over a long period of time, and the reliability can be further enhanced.

  When the resin film 27 on the back surface of the glass plate 25 and the end surface 24a on the front surface side of the frame body 24 are bonded by the double-sided tape 35, the glass plate 25 is bonded to the rigid urethane foam 29 in addition to the frame body 24 via the double-sided tape 35. Will also be glued. Therefore, the glass plate 25 is strongly bonded and held to both the rigid urethane foam 29 and the frame body 24 via the resin film 27, and it is possible to maintain and guarantee the adhesive strength of the glass plate 25 over a long period of time. And can be made more reliable.

  The above embodiment is shown as an example for carrying out the present invention, and it goes without saying that various modifications can be made within the scope of achieving the object of the present invention.

  For example, the glass plate 25 may be replaced with a transparent resin plate, which makes it possible to further guarantee the adhesive strength by reducing the weight, and to reduce the cost. The resin film may be other than polyethylene terephthalate as long as the adhesive strength of the colored layer can be managed and guaranteed.

  Further, the colored layer 28 of the resin film 27 may be on the glass plate 25 side as described above, and urethane is used as an adhesive used to improve the adhesive strength between the resin film 27 and the hard urethane foam 29. A binder or a vapor deposition layer may be used, or a vapor deposition layer and / or a urethane binder may be further interposed between the adhesive applied to the surface of the resin film 27 that contacts the hard urethane foam 29 and the hard urethane foam 29. The adhesion strength and the design of the colored layer can be improved by using as necessary.

  The heat insulating door used for the doors 10 to 14 of the refrigerator according to the present embodiment has a vacuum heat insulating material 30 disposed in a space formed by the outer plate 25, the inner plate 23, and the frame body 24. It is a heat insulating door in which the space is foam-filled with hard urethane foam 29, and the outer plate 25 is configured by a glass plate 25 on the front surface exposed to the outside, and the vacuum heat insulating material 30 is intermediate between the outer plate 25 and the inner plate 23. Further, it is arranged closer to the inner plate 23 or the vacuum heat insulating material 30 is fixed to the inner plate 23, and the front end (glass plate support protrusion 24 b) of the frame body 24 protrudes forward from the front surface of the outer plate 25 constituted by the glass plate 25. A heat insulating door in which the outer plate 25 is fixed by using the adhesive force of the hard urethane foam 29 so that the entire front surface of the outer plate 25 constituted by the glass plate 25 is exposed to the outside.

  In the above configuration, the outer plate 25 is configured such that the front surface exposed to the outside is formed of the glass plate 25 and the entire front surface of the outer plate 25 formed of the glass plate 25 is exposed to the outside. There can be a clean appearance with no flatness.

Further, the frame body 24 has a structure corresponding to a conventional glass plate insertion portion without the front end of the frame body 24 (glass plate support protrusion 24 b) protruding forward from the front surface of the outer plate 25 constituted by the glass plate 25. Since it does not have, dust etc. adhere and accumulate on the boundary part between the edge part of the front side (glass side) of the glass plate insertion part which covers the outer peripheral edge part of the front surface of the glass plate 25 from the front, and the glass plate 25 And this remains linearly along the edge and does not stand out.

  In addition, when wiping fine dust or the like adhering to the glass surface exposed to the outside in the outer plate 25, there is no unevenness that obstructs the wiping work on the glass surface to be wiped away, so fine dust It is possible to wipe off neatly without leaving any wiping off, etc., and it is excellent in cleanability, and the initial high designability (appearance excellent in aesthetics) can be maintained as it is over a long period of time.

  Moreover, since the vacuum heat insulating material 30 generally having a heat insulating performance about 20 times that of the hard urethane foam is provided in the heat insulating door with the hard urethane foam 29 in a multilayer structure, it is hard as a heat insulating material for the heat insulating door. Superior heat insulation performance than conventional heat insulation doors using only urethane foam.

  In order to fix the outer plate 25 using the adhesive force of the hard urethane foam 29 without providing the frame 24 with a structure for holding the outer plate 25, the adhesive force of the hard urethane foam 29 to the outer plate 25 is external. It is necessary that the adhesive force is sufficient for fixing (holding) the plate 25.

In a general foam filling process of the hard urethane foam 29 of the heat insulating door, first, the heat insulating door before filling the hard urethane foam 29 is installed in a foaming jig (not shown) with the outer plate 25 side down. Next, the stock solution of the hard urethane foam 29 is injected into the space surrounded by the outer plate 25, the inner plate 23, and the frame body 24. In some cases, the inner plate 23 may be put on the frame 24 after injecting the stock solution of the hard urethane foam 29 into the outer plate 25 and the frame 24 combined with the outer plate 25 side down.
The stock solution of the rigid urethane foam 29 injected into the inner space of the heat insulating door flows down to the back surface of the outer plate 25 serving as the bottom of the space, and then flows while foaming at a high temperature to fill the space. Go.

  If the rigid urethane foam 29 is not filled and voids are generated, or if the rigid urethane foam 29 before curing has a variation in density depending on the location, the pressure of the foam filling of the rigid urethane foam 29 is increased. Variations occur depending on the location.

  Moreover, after foaming of the hard urethane foam 29 performed at a high temperature, due to a difference in shrinkage due to a temperature decrease of each member of the outer plate 25, the hard urethane foam 29, the vacuum heat insulating material 30, the frame body 24, and the inner plate 23 (not yet) In the case where there is a void in the filled portion (in addition to the influence of a decrease in air pressure due to a decrease in the temperature of the air in the void in the unfilled portion), the member adjacent to the rigid urethane foam 29 is rigid urethane. When a force greater than the adhesive force by the foam 29 is about to act, the adhesive portion with the hard urethane foam 29 is partially peeled off or the adhesive force is reduced.

  At this time, if the rigidity of the outer plate 25 is insufficient, the outer plate 25 may be deformed or the glass plate 25 used for the outer plate 25 may be broken.

  And the glass plate 25 used for the outer plate 25 to increase the rigidity of the outer plate 25 so that the outer plate 25 is not deformed due to insufficient rigidity of the outer plate 25 or the glass plate 25 used for the outer plate 25 is not broken. If the thickness of the outer plate 25 is increased, the weight of the outer plate 25 increases and the weight of the outer plate 25 is increased when the heat insulating door is used in which the glass surface of the outer plate 25 is substantially parallel to the vertical direction (the glass surface of the outer plate 25 is the front surface). The balance between the force that acts so that the outer plate 25 is peeled off from the hard urethane foam 29 and the adhesive force of the hard urethane foam 29 to the outer plate 25 is deteriorated, and the outer plate 25 is hard urethane due to the weight of the outer plate 25. There is an increased risk of peeling off the foam 29.

  In general, the vacuum heat insulating material 30 is a laminate in which a plate-like core material 31 made of a fiber aggregate such as glass wool is deposited on a plastic film by depositing a metal such as aluminum or a metal foil such as an aluminum foil between the plastic films. The core material 31 is covered with two envelope materials 32 made of film and sealed under reduced pressure between the two envelope materials 32, and the core material 31 is sandwiched between the envelope materials 32 around the core material 31. It has a fin portion 33 composed only of the jacket material 32 without being included.

  And since the fin part 33 of the vacuum heat insulating material 30 tends to cause the void | void (void) generation | occurrence | production which prevents the fluidity | liquidity of the rigid urethane foam 29 which flows while foaming at high temperature, the core material 31 removes the fin part 33. Hard urethane that folds so as to overlap the sealed part between the workpieces 32 and flows while foaming at high temperature with an adhesive such as hot melt, double-sided adhesive (adhesive) sheet, single-sided adhesive (adhesive) tape, etc. Even if the foam 29 acts on the fin portion 33 or the adhesive portion in the folded state, the foam portion 33 is adhered and fixed so as to maintain the folded state.

  Moreover, when arrange | positioning the vacuum heat insulating material 30 so that it may contact | adhere to the outer plate 25 or the inner plate 23, the arrangement position of the vacuum heat insulating material 30 is not moved by the hard urethane foam 29 that flows while foaming at a high temperature. The vacuum heat insulating material 30 is fixed to the outer plate 25 or the inner plate 23 with an adhesive such as hot melt, a double-sided adhesive (adhesive) sheet, or a single-sided adhesive (adhesive) tape.

  Further, the vacuum heat insulating material 30 is placed in an intermediate floating manner so that the hard urethane foam 29 is filled between the outer plate 25 and the vacuum heat insulating material 30 and between the inner plate 23 and the vacuum heat insulating material 30. In this case, an intermediate floating member is required between any one of the outer plate 25, the inner plate 23, the frame body 24, and the vacuum heat insulating material 30.

  The vacuum heat insulating material 30, the adhesive fixing means of the vacuum heat insulating material 30, and the intermediate floating member deteriorate the fluidity of the rigid urethane foam 29 that flows while foaming at a high temperature. In addition, voids that are not filled with the hard urethane foam 29 are likely to occur.

  As described above, since voids that are not filled with the hard urethane foam 29 are likely to be generated around the vacuum heat insulating material 30, there is little adverse effect on the outer plate 25 due to the generation of the voids of the hard urethane foam 29. Thus, it can be seen that the vacuum heat insulating material 30 should be separated from the outer plate 25 rather than being disposed close to the outer plate 25.

  Moreover, when arrange | positioning the vacuum heat insulating material 30 so that it may contact | adhere to the outer plate 25, if the heat-transfer surface of the vacuum heat insulating material 30 is smaller than the area of the outer plate 25, the outer plate 25 and the rigid urethane foam 29 will adhere. A portion where the vacuum heat insulating material 30 is interposed between the portion and the outer plate 25 and the rigid urethane foam 29 is formed.

  For the portion where the outer plate 25 and the hard urethane foam 29 are in close contact, the adhesive force of the hard urethane foam 29 to the outer plate 25 acts on the force for holding the outer plate 25, but the outer plate 25 and the hard urethane foam 29 As for the portion where the vacuum heat insulating material 30 is interposed between them, both the adhesive force of the adhesive fixing means of the outer plate 25 and the vacuum heat insulating material 30 and the adhesive force of the hard urethane foam 29 to the vacuum heat insulating material 30 are outside. It acts on the force that holds the plate 25.

Therefore, in the portion where the vacuum heat insulating material 30 is interposed between the outer plate 25 and the rigid urethane foam 29, the force for holding the outer plate 25 is larger than the adhesive force of the adhesive fixing means between the outer plate 25 and the vacuum heat insulating material 30. It becomes weaker than the adhesive force of the hard urethane foam 29 to the vacuum heat insulating material 30. Further, the adhesive force of the hard urethane foam 29 to the vacuum heat insulating material 30 is more likely to vary than the adhesive force of the hard urethane foam 29 to the outer plate 25.

  In addition, in the jig preheating step before the foam filling of the hard urethane foam 29, in order to improve the fluidity and foaming efficiency of the hard urethane foam 29 that flows while foaming at a high temperature, heating provided in a foaming jig (not shown) is performed. By means (not shown), the surface temperature of the member adjacent to the rigid urethane foam 29 is increased to a predetermined temperature, but the surface opposite to the surface that is susceptible to the heating of the heating means in the vacuum heat insulating material 30 is Due to the high heat insulation performance of the vacuum heat insulating material 30, the temperature hardly rises.

  And when there is a heating means in the foaming jig adjacent to the outer plate 25 and the vacuum heat insulating material 30 is disposed so as to be in close contact with the outer plate 25, the high heat insulating performance of the vacuum heat insulating material 30 affects the vacuum. Since the surface temperature of the surface of the heat insulating material 30 facing the inner plate 23 is lower than the predetermined temperature, the adhesive force of the rigid urethane foam 29 to the vacuum heat insulating material 30 is deteriorated.

  Therefore, when the vacuum heat insulating material 30 is disposed so as to be in close contact with the outer plate 25, the force for holding the outer plate 25 is greater than when the rigid urethane foam 29 is interposed between the outer plate 25 and the vacuum heat insulating material 30. Decreases.

  In addition, in order to make the glass plate 25 used for the outer plate 25 difficult to break due to an external impact, it is necessary to use an external material that functions as a relatively soft cushioning material that absorbs and disperses the external impact force on the outer plate 25. Since it is desirable to be adjacent to the outer plate 25 on the inner side of the plate 25, when the hardness of the vacuum heat insulating material 30 is harder than that of the hard urethane foam 29, the vacuum heat insulating material 30 is disposed so as to be in close contact with the outer plate 25. The glass plate 25 used for the outer plate 25 is less likely to be broken by an external impact when the rigid urethane foam 29 is interposed between the outer plate 25 and the vacuum heat insulating material 30.

  Further, in the case where the vacuum heat insulating material 30 is disposed so as to be in close contact with the outer plate 25, when the outer plate 25 and the hard urethane foam 29 are in close contact with each other, or the surface of the vacuum heat insulating material 30 that is in close contact with the outer plate 25. If there is unevenness or if the fin portion 33 of the vacuum heat insulating material 30 is folded back to the surface facing the outer plate 25, the portion that receives the impact force from the outside on the outer plate 25 on the inner side of the outer plate 25 is locally It becomes easy to concentrate on.

  And if the part which receives the impact force from the outside with respect to the outer plate 25 on the inner side of the outer plate 25 is concentrated on the local part, the glass plate 25 used for the outer plate 25 is easily broken by the impact from the outside. It is not preferable to arrange the vacuum heat insulating material 30 so as to be in close contact.

  Further, when the vacuum heat insulating material 30 is disposed so as to be in close contact with the outer plate 25, the vacuum heat insulating material 30 deposits a plate-like core material 31 made of a fiber assembly such as glass wool on a plastic film such as aluminum. The core material 31 is sealed under reduced pressure between the two jacket materials 32 by covering the deposited layer or metal foil such as an aluminum foil with two jacket materials 32 made of a laminate film having a plastic film between them. In addition, a core portion 31 is not included between the outer jacket materials 32 around the core material 31, and has a fin portion 33 composed only of the outer jacket material 32. , The heat transferred from the outer plate 25 to the vacuum heat insulating material 30 is transferred from the outer cover material 32 closely contacting the outer plate 25 to the fin portion 33, and the fin portion 33 is connected to the inner plate 23. Fold to the opposite side Since it has, and therefore transmitted to a portion facing the inner plate 23 in the fin portion 33, it is impossible to sufficiently exhibit the high heat insulating performance of the vacuum heat insulating material 30.

In addition, the vacuum heat insulating material 30 is a laminate in which a plate-like core material 31 made of a fiber aggregate such as glass wool is deposited on a plastic film or a metal foil such as an aluminum foil between the plastic films. The core material 31 is covered with two envelope materials 32 made of film and sealed under reduced pressure between the two envelope materials 32, and the core material 31 is sandwiched between the envelope materials 32 around the core material 31. It has the fin part 33 comprised only from the jacket material 32 not including, and the gas (air) outside the vacuum heat insulating material 30 is sealed inside the vacuum heat insulating material 30 (the core material is sealed by the jacket material 32. When the covering materials 32 of the fin portions 33 are thermally welded so as not to easily enter the space), the higher the installation environment of the vacuum heat insulating material 30 is, the higher the gas outside the vacuum heat insulating material 30 ( Air) is the jacket material 32 or The covering material 32 between the heat seal portion, easily penetrate into the inside of the vacuum heat insulating material 30.

  Since the heat insulating performance of the vacuum heat insulating material 30 decreases as the internal vacuum degree decreases (internal pressure increases), in order to maintain the high heat insulating performance of the vacuum heat insulating material 30 over a long period of time, the installation of the vacuum heat insulating material 30 is performed. The lower the environment, the better.

  In the present embodiment, the vacuum heat insulating material 30 is disposed closer to the inner plate 23 than the middle between the outer plate 25 and the inner plate 23 or the vacuum heat insulating material 30 is fixed to the inner plate 23. The vacuum heat insulating material 30 is made into a multilayer structure together with the hard urethane foam 29 in the heat insulating door as compared with the case where the vacuum heat insulating material 30 is fixed to the outer plate 25 than the intermediate plate 25 and the inner plate 23. It is possible to reduce the influence of the lowering of the function of fixing (holding) the outer plate 25 by the adhesive force of the hard urethane foam 29 provided in the structure, and it is possible to make the glass plate 25 used for the outer plate 25 thinner. The outer plate 25 can be fixed by using the adhesive force of the hard urethane foam 29 so that the entire front surface of the outer plate 25 constituted by the glass plate 25 is exposed to the outside. Hard urethane It may utilize the adhesive force of Omu 29 fixed (held).

  Therefore, the heat insulating door used for the refrigerator doors 10 to 14 of the present embodiment uses the outer plate 25 and the vacuum heat insulating material 30 whose front surface exposed to the outside is configured by the glass plate 25, and Since the front end (glass plate support protrusion 24b) does not protrude forward from the front surface of the outer plate 25 constituted by the glass plate 25, the entire front surface of the outer plate 25 constituted by the glass plate 25 is exposed to the outside. Excellent heat insulation performance and design.

  Further, even when the entire front surface of the outer plate 25 made of the glass plate 25 is exposed to the outside, the surface exposed to the outside is made of the glass plate 25 using the adhesive force of the hard urethane foam 29. Since the plate 25 can be prevented from falling off with high reliability over a long period of time, excellent design can be maintained over a long period of time.

  Moreover, the heat insulation door used for the doors 10-14 of the refrigerator of this Embodiment folds the fin part 33 of the vacuum heat insulating material 30 so that it may overlap the part with which the core material 31 was sealed, Double-sided tape 34 or single-sided adhesive tape from above (for example, OPP tape with excellent water resistance and moisture resistance used mainly for packaging (stretched polypropylene tape coated with a pressure-sensitive adhesive by melt-extrusion polypropylene material) ) And the vacuum insulation material 30 is fixed to the inner plate 23 with a double-sided tape 34 with the surface having the folded fin portion 33 facing the inner plate 23 side.

  When the vacuum heat insulating material 30 is fixed to the inner plate 23 in this way, the hard urethane foam 29 that flows while foaming at a high temperature does not act so as to peel off the portion where the folded fin portion 33 is bonded and fixed. The adhesion fixing state of the fin portion 33 can be maintained for a long time.

In the present embodiment, the vacuum heat insulating material 30 is fixed to the inner plate 23 so that the hard urethane foam 29 does not enter between the vacuum heat insulating material 30 and the inner plate 23. The vacuum heat insulating material 30 is placed in an intermediate floating position so that the hard urethane foam 29 is filled between the space between the inner plate 23 and the vacuum heat insulating material 30, and faces the outer plate 25 of the vacuum heat insulating material 30. The fins 33 where the heat transferred to the heat transfer surface is turned back or the inner plate 23 of the vacuum heat insulating material 30 is opposed (substantially in contact) via the portions where the outer cover materials 32 on both surfaces of the vacuum heat insulating material 30 are heat-welded. In order to prevent direct transmission from the heat transfer surface facing (substantially) the inner plate 23 of the vacuum heat insulating material 30 to the inner plate 23 after being transmitted to the heat transfer surface, the vacuum heat insulating material 30 is connected to the outer plate 25. It is arranged closer to the inner plate 23 than the middle of the inner plate 23. In this case, it is desirable to provide an intermediate floating member between the frame body 24 and the vacuum heat insulating material 30.

(Reference example)
FIG. 7 is a schematic cross-sectional view of a heat insulating door serving as a reference example of the present invention. In this reference example , the fin portion 33 of the vacuum heat insulating material 30 is folded back so as to overlap the sealed portion of the core material 31 and fixed with a hot-melt adhesive 36, and the surface with the folded fin portion 33 is the outer plate 25 side. Toward, the vacuum heat insulating material 30 is fixed to the inner plate 23 with a double-sided tape 34, and the other configurations are the same as in the first embodiment.

  The hot melt adhesive 36 for fixing the folded fin portion 33 is an olefin-based hot melt material, and “MORESCOME RAC-18Z” manufactured by MORESCO Co., Ltd. was adopted. The coating amount was 0.5 g / m to 1.5 g / m, and the board was applied.

  Instead of the hot melt adhesive 36, “Everlight” manufactured by Bridgestone in which an adhesive material is applied to a urethane foam material may be used. In this case, since it is a urethane foam material, the rigid urethane foam 29 is impregnated and does not peel off.

  The heat insulating door of the present invention uses a glass plate on the front surface, and a vacuum heat insulating material is formed in a heat insulating door with a multilayer structure together with a hard urethane foam, and the adhesion force between the crow plate and the hard urethane foam is extended over a long period of time. Can be maintained at the same time, and the design and heat insulation performance can be improved and the high design can be maintained for a long time, so it is widely used not only for general-purpose (household) refrigerators but also commercial refrigerators and wine coolers. Applicable.

23 inner plate 24 frame 24b glass plate support protrusion 25 outer plate (glass plate)
29 Hard urethane foam 30 Vacuum heat insulating material 31 Core material 32 Outer covering material 33 Fin part 36 Hot melt adhesive

Claims (1)

A heat insulating door in which a vacuum heat insulating material is disposed in a space formed by an outer plate, an inner plate, and a frame and foamed and filled with hard urethane foam in the space other than the vacuum heat insulating material, the outer plate being external A front surface that is exposed to a glass plate, the vacuum heat insulating material is disposed closer to the inner plate than an intermediate between the outer plate and the inner plate, or the vacuum heat insulating material is fixed to the inner plate, and the frame body The front plate is bonded to the hard urethane foam so that the entire front surface of the outer plate made of the glass plate is exposed to the outside without protruding forward from the front surface of the outer plate made of the glass plate. The vacuum heat insulating material is covered with a jacket material and sealed under reduced pressure, and the vacuum heat insulating material does not include the core material around the core material. The fin portion is composed of the core material sealed with the fin portion. Folded and fixed so as to overlap the portion, the surface on which there is a fin portion folded back toward the inside plate side, insulating door, characterized in that said vacuum heat insulator is fixed to the inner plate.