JP5532097B2 - Refrigerator door and manufacturing method thereof - Google Patents

Description

  The present invention relates to a refrigerator door and a method for manufacturing the same.

  Generally, a refrigerator is provided with a refrigerator compartment, a freezer compartment, a vegetable compartment, etc. in a refrigerator main body having heat insulation properties, and these refrigerator compartments, freezer compartments, vegetable compartments, etc. can be opened and closed by doors.

  The door is urethane between a front plate that is the front surface of the refrigerator body, an inner frame that is an inner surface of a refrigerator compartment, a freezer compartment, a vegetable compartment, etc., and a frame that integrally connects the front plate and the inner frame. Is filled and foamed so that it has the same heat insulation as the refrigerator main body.

  Such a front plate of the refrigerator door has a great influence on the appearance of the entire refrigerator, that is, the design, and the finish greatly affects the quality of the entire refrigerator.

  In view of this, there is a structure in which the front plate of the door is made of a glass plate in order to improve the design of the door (for example, see Patent Document 1).

  FIG. 8 shows the door proposed in the above-mentioned Patent Document 1, and its front plate 101 is composed of a colored glass plate 103 in which a colored layer 102 such as a pattern is formed by silk printing, and the colored glass plate 103 and the inner frame. A urethane 106 is filled and foamed between the frame 104 and the frame 105.

Japanese Patent No. 3140110

  According to the above conventional configuration, since the transparent layer of the colored glass plate 103 is positioned in front of the colored layer 102, the color is added to the depth and the texture is increased, compared with the pre-painted plate made of metal or resin. There exists an advantage which the design property improves.

  However, since the conventional door is provided with the colored glass plate insertion portion 107 in the frame body 105 and the colored glass plate 103 is held in the colored glass plate insertion portion 107 by inserting the colored glass plate 103, the colored glass plate 103 The edge part of the insertion part 107 was exposed to the front surface periphery of the colored glass plate 103, and there existed a subject that the designability improved using the colored glass plate 103 was impaired.

  In addition, very fine pride and dust are deposited on the boundary between the edge of the colored glass plate insertion portion 107 and the surface of the colored glass plate 103, and this fine dust or dust is about to be wiped off. Can not be completely wiped off and begins to appear linear along the edge. If the coloring of the colored glass plate 103 is white, it will be noticeable after a short period of use, and will become more noticeable as the use period becomes longer, which greatly impairs the aesthetics of the refrigerator.

  Therefore, in order to solve such a problem, the applicant abolished the colored glass insertion portion 107 of the frame body 105, and bonded and held the colored glass plate 103 with the adhesive force of the urethane foam 106, so that the end portion of the colored glass plate 103 was retained. I made a prototype that was exposed.

  As a result, it was found that the outer peripheral portion of the colored glass plate 103 warps inward due to the thermal contraction of the urethane foam 106 after filling and foaming with urethane. This is the urethane foaming process, and the inner frame 104 and the urethane 106 expand and heat shrink after the process is finished. However, the heat shrinkage is as large as the outer periphery, and the colored glass plate 103 does not heat shrink so much. The outer peripheral portion of the plate 103 is warped and deformed due to the thermal contraction of the urethane foam 106 due to adhesion with the urethane foam 106.

  Further, this warpage deformation progresses with time even though it is slight even by operation of the refrigerator. That is, by the operation of the refrigerator, the foamed urethane 106 is cooled and thermally contracted on the inside of the door, but is kept at the same temperature as the outside air temperature on the outside of the door. The deformation progressed in a warped shape. This warpage deformation is very small, about 2 mm, including the warpage at the time of molding the door, but it is at a level that the user will notice if the door has a large area, such as a refrigerator door. It will reduce the sex.

  The above problem can be solved if the colored glass plate 103 is not adhered and held to the urethane foam. In this case, the colored glass plate insertion portion 107 is provided in the frame 105 as in the conventional case. It is necessary to hold the colored glass plate 103 on 107, and the edge of the colored glass plate insertion portion 107 is exposed around the front surface of the colored glass plate 103, which leaves a problem of impairing the design.

  The present invention has been made in view of such a point, and while preventing the transparent front plate insertion portion such as a colored glass plate from being removed and improving the design, the warp deformation of the transparent front plate is prevented for a long period of time. Thus, a refrigerator door capable of maintaining the flatness of the transparent front plate and maintaining good design properties is provided.

  In order to achieve the above object, the present invention provides a transparent door with a colored layer such as an inner frame located inside the storage chamber and a glass plate disposed on an edge frame of the inner frame so as to cover the inner frame. The front plate is made of urethane foam filled and foamed in the space between the transparent front plate, the inner frame and the edge frame, and the transparent front plate is bonded and held by foamed urethane, and the outer peripheral portion is transparent front The transparent front plate is configured so that it is exposed as it is without being covered with a plate insertion portion or the like, and the longitudinal side difference between the center and the end in the longitudinal direction of the long side is at least the long side with respect to the perpendicular in the longitudinal direction of the long side. The length is within 0.5% of the longitudinal dimension.

  Thereby, while being able to demonstrate the high texture by having used the transparent front plate, the transparent front plate can be bonded and held by foamed urethane, the transparent front plate insertion part can be eliminated, and the design can be improved, and Nevertheless, even if the transparent front plate is bonded and held to the urethane foam, the warp deformation of the transparent front plate due to the thermal shrinkage of the urethane foam is prevented, and the heat shrinkage force of the urethane foam and the rigidity of the transparent front plate are balanced. The flat front of the transparent front plate can be maintained at least within 0.5% of the longitudinal dimension of the long side in the longitudinal direction with respect to the perpendicular in the longitudinal direction of the long side. Thus, a refrigerator door with little warping deformation and high quality can be obtained.

  The present invention can provide a refrigerator door with less warping deformation of the transparent front plate while eliminating the transparent front plate insertion portion such as a colored glass plate and improving the design.

External appearance perspective view of the refrigerator in Embodiment 1 of this invention Schematic sectional view of the refrigerator Perspective view showing one of the doors of the refrigerator Exploded perspective view of the refrigerator door AA sectional view of FIG. BB sectional view of FIG. Explanatory drawing which shows the manufacturing process of the door of the refrigerator Sectional view of a door in a conventional refrigerator

1st invention is a door which opens and closes the storage room of a refrigerator, Comprising: The said door is the glass arrange | positioned on the inner frame located in the inside of a storage room, and the edge frame of the inner frame so that the said inner frame may be covered It consists of a transparent front plate with a colored layer such as a plate, and foamed urethane filled and foamed in the space between the transparent front plate, the inner frame and the edge frame, and the transparent front plate is bonded by foamed urethane The outer peripheral portion is held without being covered with a transparent front plate insertion portion or the like, and is exposed as it is, and the transparent front plate has at least the long side longitudinal center and the end with respect to the long side longitudinal direction perpendicular line. The dimensional difference in the front-rear direction is set to be within 0.5% of the longitudinal dimension in the long side , and the urethane foam is configured such that the foam density of the outer peripheral part is higher than the foam density of the central part .

Thereby, while being able to demonstrate the high texture by having used the transparent front plate, the transparent front plate can be bonded and held by foamed urethane, the transparent front plate insertion part can be eliminated, and the design can be improved, and Nevertheless, even if the transparent front plate is bonded and held to the urethane foam, the warp deformation of the transparent front plate due to the thermal shrinkage of the urethane foam is prevented, and the heat shrinkage force of the urethane foam and the rigidity of the transparent front plate are balanced. The flat front of the transparent front plate can be maintained at least within 0.5% of the longitudinal dimension of the long side in the longitudinal direction with respect to the perpendicular in the longitudinal direction of the long side. Thus, a refrigerator door with little warping deformation and high quality can be obtained. In addition, the outer peripheral part of urethane foam has a larger amount of urethane itself due to the higher foaming density, and the heat shrink deformation of the outer peripheral part of the urethane foam is less than the heat shrink deformation of the central part. When viewed as a whole, the heat shrink deformation is almost the same over the entire surface of the urethane foam, and the outer peripheral portion is unlikely to be warped. Therefore, the transparent front plate can also prevent the warpage deformation of its outer peripheral part, and can also suppress the progress of warpage deformation that may progress over time due to the internal and external temperature difference of the urethane foam, making the transparent front plate more flat, And the flatness can be maintained over a long period of time. 2nd invention is a door which opens and closes the storage room of a refrigerator, Comprising: The said door is the glass arrange | positioned in the edge frame of the inner frame so that the said inner frame located inside a storage room and the said inner frame may be covered It consists of a transparent front plate with a colored layer of the plate, and foamed urethane filled and foamed in the space between the transparent front plate, the inner frame and the edge frame, and the transparent front plate is bonded and held by foamed urethane The outer periphery of the transparent front plate is not covered with a transparent front plate insertion portion or the like and is exposed as it is, and the transparent front plate has at least a long side.
The dimensional difference in the longitudinal direction between the longitudinal center of the long side and the end with respect to the perpendicular to the longitudinal direction is within 0.5% of the longitudinal dimension of the long side, and the urethane foam has a weight per unit volume of its outer peripheral part in the middle It is configured to be heavier than the weight per unit volume of the portion. As a result, the heat shrinkage deformation of the outer peripheral part of the urethane foam is less than the heat shrinkage deformation of the central part because the weight of the urethane itself is larger and less, so the heat shrinkage when viewed with the entire urethane foam The deformation is almost the same over the entire surface of the urethane foam, and the outer peripheral portion is unlikely to be warped. Therefore, the transparent front plate can also prevent the warpage deformation of its outer peripheral part, and can also suppress the progress of warpage deformation that may progress over time due to the internal and external temperature difference of the urethane foam, making the transparent front plate more flat, And the flatness can be maintained over a long period of time.

According to a third invention, in the first or second invention, the transparent front plate is configured such that urethane foam is filled and foamed in a state where the outer peripheral portion of the transparent front plate is warped outward.

  As a result, the outer peripheral portion of the transparent front plate returns to the base flat surface state due to the thermal contraction of the outer peripheral portion of the urethane foam, so that the flatness of the transparent front plate is ensured and warping deformation is less. It can be set as the door for refrigerators with high flatness.

A fourth invention is the first or second invention, wherein the transparent front plate has a linear expansion coefficient set smaller than that of urethane foam.

  As a result, the transparent front plate is less likely to heat shrink than foamed urethane, and the transparent front plate hardly undergoes heat shrinkage deformation after the urethane foam has undergone some heat shrinkage and the transparent front plate becomes flat. The heat shrink deformation of the above urethane foam is suppressed, that is, the heat shrink deformation of the transparent front plate is suppressed. Therefore, the flatness of the transparent front plate is high.

5th invention is set as the structure which embed | buried and arrange | positioned the vacuum heat insulation board in the urethane foam between an inner frame and a transparent front board in 1st- 4th invention.

  Thereby, in addition to the rigidity which a vacuum heat insulating board has, the heat shrink deformation | transformation of urethane foam can be suppressed by the following effects, and the curvature deformation of a transparent front board can be decreased more. In other words, the foamed urethane foams as the filled urethane flows around the plate body and flows from the transparent front plate side to the inner frame side, so there is a difference in the foam density between the inner frame side and the transparent front plate side. The foam density on the inner frame side is increased, and the amount of urethane is also increased. For this reason, the urethane foam on the inner frame side is less likely to cause thermal shrinkage than the urethane foam on the transparent front plate side. And since the urethane foam on the inner frame side is cooled by the cold air from the inside of the refrigerator and tends to cause heat shrinkage, the urethane foam on the inner frame side that is easily heat shrinkable can be made difficult to heat shrink. Therefore, the warpage deformation of the entire door can be reduced, and the generation of warpage deformation of the transparent front plate over time can be prevented.

  In addition, when the transparent front plate is a glass plate, the glass has a large specific heat, and once cooled by heat transfer from the inner frame, etc., it contacts with high humidity outside air or cold air when the door is opened and closed, causing condensation and sweating. However, there is an advantage that heat transfer is blocked by the vacuum heat insulating plate and sweating can be prevented.

According to a sixth invention, in the first to fifth inventions, the outer peripheral edge of the transparent front plate is positioned inside the outer peripheral edge of the edge frame.

  As a result, the outer peripheral edge of the transparent front plate that adheres to the urethane foam and is always stressed by the heat shrinkage force of the urethane foam can be protected by the edge frame to prevent external force from being applied. It is possible to reliably prevent damage to the transparent front plate that is easily damaged even if it is added, and to improve reliability as well as design.

In a seventh aspect of the invention, the transparent front plate and the edge frame are set in a mold, and after filling urethane into the space formed by the edge frame and the transparent front plate, the inner frame is covered with the edge frame to a predetermined pressure. Is a method for manufacturing a refrigerator door in which urethane is foamed in a state in which the outer peripheral portion of the transparent front plate is bent outward and the transparent front plate, the edge frame, and the inner frame are integrated with foamed urethane.

According to this method, the warping of the outer peripheral portion of the transparent front plate that has been warped outward at the time of door molding due to heat shrinkage at the time of solidification of the urethane foam returns to a substantially flat surface, and in that state the heat shrinkage force of the urethane foam and The transparent front plate balances with the rigidity of the transparent front plate so that the transparent front plate is in a substantially flat state, and the transparent front plate has at least a longitudinal difference in the longitudinal direction between the longitudinal center of the long side and the end with respect to the vertical in the longitudinal direction of the long side. It is within 0.5% of the dimension in the longitudinal direction of the long side. Therefore, similarly to the first invention, the warp deformation of the transparent front plate due to the thermal contraction of the urethane foam is small, and the refrigerator door can have a high texture.

According to an eighth invention, in the seventh invention, after arranging the edge frame on the outer peripheral portion of the transparent front plate, the vacuum heat insulating plate is placed between the transparent front plate and the space formed by the edge frame and the transparent front plate. This is a method in which a space is formed and then urethane is filled into the space formed by the edge frame and the transparent front plate and foamed.

Thereby, a vacuum heat insulation board is embed | buried in foaming urethane at the time of door molding, and the curvature deformation of a transparent front board can be prevented more reliably. In the ninth invention, the glass plate of the first to sixth inventions is replaced with a resin plate, and the cost can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In this embodiment, the structure for strengthening the adhesive holding force of the transparent front plate, which is concerned by the elimination of the transparent front plate insertion portion that holds the outer peripheral portion of the transparent front plate such as a glass plate, particularly applied to the transparent front plate Although an example corresponding to peeling of the transparent front plate caused by the colored layer to be described will be described as an example, the present invention is not limited thereto.

(Embodiment 1)
1 is an external perspective view of the refrigerator according to Embodiment 1 of the present invention, FIG. 2 is a schematic sectional view of the refrigerator, FIG. 3 is a perspective view showing one of the doors of the refrigerator, and FIG. FIG. 5 is an AA cross-sectional view of FIG. 3, FIG. 6 is a BB cross-sectional view of FIG. 3, and FIG. 7 is an explanatory view showing a door manufacturing process.

  1 and 2, the refrigerator body 1 includes a metal (for example, iron plate) outer box 2 that opens forward, an inner box 3 that is made of hard resin (for example, ABS), an outer box 2, and an inner box 3. It consists of the hard foaming urethane 4 foam-filled between. The refrigerator main body 1 is located inside the refrigerator compartment 5, the switching chamber 6 located below the refrigerator compartment 5, the ice making chamber 7 juxtaposed to the switching chamber 6, and the switching chamber 6 and the lower part of the ice making chamber 7. It has a freezer compartment 8 and a vegetable compartment 9 located below the freezer compartment 8. Further, the front surface of the refrigerator compartment 5 is opened and closed freely by, for example, double doors 10 and 10, and the front portions of the switching chamber 6, the ice making chamber 7, the freezer compartment 8 and the vegetable compartment 9 are drawn out doors 11, 12, 13 and 14 are closed freely.

  There is a cooling chamber 16 on the back surface of the refrigerator body 1, and a cooler 17 that generates cool air and a blower fan 18 that supplies the cool air to each chamber are provided. In addition, a compressor 19 is provided at the back of the top of the main body of the refrigerator body 1, and a condenser (not shown), a heat radiating pipe 20, a capillary tube 21, and the cooler 17 described above are provided. A refrigerant is enclosed in a refrigeration cycle that is sequentially connected in an annular manner, and a cooling operation is performed.

  Here, each of the doors 10 to 14 is formed in a rectangular shape by filling and foaming hard urethane like the refrigerator main body 1 so as to have heat insulation properties, and the front surface thereof is made of a glass plate or the like in order to further improve the design. It consists of a transparent front plate.

  Hereinafter, the structure of the door 10 will be described as an example with reference to FIGS. The doors 11 to 14 other than the door 10 have the same configuration.

  3-6, 23 is an inner frame which will be located inside the refrigerator main body 1, for example, is formed with ABS resin. Reference numeral 24 denotes an edge frame bonded and fixed to the peripheral end surface of the inner frame 23, which is also formed of ABS resin. Reference numeral 25 denotes a transparent front plate (hereinafter referred to as a glass plate) such as a glass plate laminated on the edge frame 24 so as to cover the inner frame 23, and in this embodiment, it is formed of a glossy tempered glass plate. is there.

As shown in FIGS. 5 and 6, a resin film 27 is attached to the inner surface of the glass plate 25 via an adhesive 26. The resin film 27 is made of a picture pattern, for example, a metallic pattern such as a hairline. A colored layer 28 is formed. As a result, the glass plate 25 becomes a glass plate with a colored layer. In this embodiment, the resin film 27 is made of polyethylene terephthalate having high transparency and high mechanical strength, 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.

  29 is a hard urethane filled and foamed in the space between the inner film 23 and the edge frame 24 on the surface of the glass plate 25 on the resin film 27 side, and the glass plate 25 together with the inner frame 23 and the edge frame 24 by foaming. The glass plate 25 is adhered to and held on the resin film 27 on the inner surface via the resin film 27.

  Here, the edge frame 24 of the inner frame 23 does not have the colored glass plate insertion portion as described in the conventional example, and the glass plate 25 has a configuration in which the outer peripheral portion is exposed as it is. Further, the glass plate 25 has a configuration in which the outer peripheral edge is positioned slightly inside the outer peripheral edge 24a of the edge frame 24 as shown in FIG.

  Further, the glass plate 25 is configured to maintain a flat surface against heat shrinkage generated in the urethane foam 29. In this embodiment, for example, the glass plate 25 is configured by filling and foaming urethane foam 29 with its outer peripheral portion bent in advance outside the door, thereby maintaining a flat surface against thermal contraction of the urethane foam 29. It is as composition to do.

  In addition, the glass plate 25 having a linear expansion coefficient of 9.5 to 11 × 10 ^ (− 5) / ° C. is selected, and the inner frame 23 and the edge frame 24 also have a linear expansion coefficient of 0. 85 to 0.9 × 10 ^ (− 5) / ° C., and compared with the linear expansion coefficient of foamed urethane 29 of 10 to 20 × 10 ^ (− 5) / ° C., the glass plate 25, the inner frame 23 and the edge The linear expansion coefficient of the frame 24 is small, and the glass plate 25 maintains the flatness even with such a configuration.

  Further, the foamed urethane 29 has a foam density at the outer peripheral portion higher than the foam density at the central portion, so that the shrinkage degree of the outer peripheral portion is less than the shrinkage degree of the central portion. 29 is configured to maintain a flat surface against heat shrinkage. The foam density is made higher at the outer peripheral portion, for example, by providing an air vent hole at a position corresponding to the foam outer peripheral portion of the inner frame 23 so that the urethane foams into the core at the air vent hole portion. Can be formed.

  Further, a vacuum heat insulating plate 30 is embedded between the inner frame 23 and the glass plate 25 over almost the entire area, and the glass plate 25 is made of urethane foam due to the rigidity and heat insulating properties of the vacuum heat insulating plate 30. 29 is configured to maintain a flat surface against heat shrinkage.

  On the other hand, the door of this embodiment is provided with a configuration that ensures the adhesion and holding of the glass plate 25, which is concerned by eliminating the glass plate insertion portion that holds the outer peripheral portion of the glass plate 25. Will be explained.

First, the glass plate 25 is formed as a colored glass plate by attaching the resin film 27 on which the colored layer 28 is formed with the adhesive 26 as described above. An easy adhesion layer 32 is formed on the surface of the resin film 27 on the urethane foam side, and the resin film 27 is bonded to the urethane foam 29 via the easy adhesion layer 32. The easy-adhesion layer 32 can be formed by subjecting the surface of the resin film 27 to corona treatment or plasma treatment, or applying a polyester or urethane adhesive. In this embodiment, a polyester adhesive is applied.

  Further, as already described, the foamed urethane 29 filled and foamed in the space between the surface of the glass plate 25 on the side of the resin film 27 and the inner frame 23 and the edge frame 24 has its foaming density at the central portion of the glass plate 25. The outer peripheral part is set higher.

  Further, the resin film 27 of the glass plate 25 and the edge frame 24 of the inner frame 23 are bonded by a double-sided tape 31 as shown in FIG.

  Furthermore, in this embodiment, as shown in FIG. 5, a portion of the edge frame 24 of the inner frame 23 that is located on the lower end surface of the glass plate 25 is projected forward from the front surface of the glass plate 25. A transparent front plate support piece (hereinafter referred to as a glass plate support piece) 24 b that protrudes to a position within 2 mm from the front surface of the glass plate 25 and superposes on the lower surface of the glass plate is provided, It is configured to support the weight of the plate 25.

  In the refrigerator door 10 configured as described above, the colored layer 28 made of a metal-like pattern such as a hairline is located inside the transparent layer made of the glass plate 25 and the resin film 27, so that the color of the color has a depth. In addition, the design is greatly improved compared to the pre-painted plate made of metal or resin. Particularly in this embodiment, since the colored layer 28 is formed on the resin film 27, the colored layer 28 can be formed by a roller or the like, and if the colored layer is silk-printed directly on a glass plate, the defective rate is substantially high. A fine pattern such as a hairline that could not be obtained can be formed, and its design can be remarkably improved.

  Moreover, when emphasizing the hairline three-dimensionally, an uneven groove is provided on the surface of the resin film 27 opposite to the colored layer 28 formed on the glass plate 25 side to form a three-dimensional hairline, A chromium vapor deposition layer (not shown) may be formed on the surface. Thereby, a hairline becomes three-dimensional and can improve the designability. At that time, by using chromium as the material of the vapor deposition layer, it is possible to prevent the rust of the vapor deposition layer starting from the end surfaces of the resin film 27 and the vapor deposition layer, and to improve the durability of the pattern.

  Moreover, this door eliminates the conventional glass plate insertion portion that covers the peripheral edge of the glass plate by adhering and holding the glass plate 25 with the adhesive force of the urethane foam 29, so that there is a glass plate insertion portion. In this way, the design can be made without any loss and a clean appearance with a flat feeling on the entire surface can be obtained. In addition, dust or dust adheres and accumulates at the boundary between the glass plate insertion portion and the glass plate, and this does not stand out linearly, maintaining the initial high design as it is for a long period of time. be able to.

  On the other hand, since the glass plate 25 constituting the front surface of the door is configured to maintain a flat surface against the thermal shrinkage of the urethane foam 29, even if the glass plate 25 is adhered and held to the urethane foam 29, the urethane foam It is possible to prevent the warp deformation of the glass plate 25 due to the heat shrinkage of 29 and keep the flat surface, and it is possible to obtain a refrigerator door having no high warp deformation and high quality.

  That is, in this embodiment, in order to maintain a flat surface against heat shrinkage, the glass plate 25 is configured to be filled and foamed with urethane in a state where its outer peripheral portion is warped to the outside of the door in advance. Accordingly, the outer peripheral portion of the glass plate 25 returns to the base flat surface state as the urethane foam 29 is thermally contracted when solid. In this state, the heat shrinkage force of the urethane foam 29 and the rigidity force of the glass plate 25 are balanced, and the glass plate 25 is in a substantially flat state.

This substantially planar state is a vertical line in the longitudinal direction of at least the long side of the glass plate 25 (the “perpendicular line” in the present invention is the length when the long side longitudinal direction is the horizontal direction as well as the long side longitudinal direction is the vertical direction. The horizontal dimension in the longitudinal direction of the side is also referred to), and the dimensional difference in the longitudinal direction between the longitudinal center of the long side and the end is within 0.5%, preferably within 0.3% of the longitudinal dimension in the long side. If it is within this range, it will appear as a flat surface with almost no warp when recognized by human eyesight. That is, the flatness of the glass plate 25 is ensured even when the foamed urethane 29 is thermally contracted, and warpage deformation is reduced, so that a refrigerator door with high flatness can be obtained.

  At this time, in this embodiment, since the glass plate 25 has a linear expansion coefficient smaller than that of the urethane foam 29, the flatness is also high from this point. That is, the glass plate 25 is less susceptible to heat shrinkage than the foamed urethane 29, and hardly undergoes heat shrinkage deformation after the glass plate 25 returns to the flat surface state of the base. Is suppressed by the rigidity of the glass plate 25, that is, the thermal contraction deformation of the glass plate 25 itself is suppressed. Therefore, the flatness of the glass plate 25 is maintained at a high level.

  Further, since the foamed urethane 29 has a foam density higher (dense) in the outer peripheral portion than in the central portion, the amount of urethane itself increases in the outer peripheral portion of the foamed urethane 29 due to the higher cell density. Therefore, since the heat shrink deformation of the outer peripheral portion of the urethane foam 29 is less than that of the central portion, the heat shrink deformation when viewed as a whole of the urethane foam is substantially the same over the entire surface of the urethane foam. Therefore, it is difficult for the outer periphery to warp. Therefore, the glass plate 25 can be in a substantially flat state when the warpage returns without increasing the amount of warpage of the glass plate 25 at the time of door molding. Also from the point, it is suppressed that the outer peripheral portion of the glass plate 25 is warped by urethane heat shrinkage, and the glass plate 25 can be made flatter. In addition, warpage deformation of the foamed urethane 29, that is, warpage deformation of the glass plate 25, which may progress with time due to a temperature difference between the inside and outside of the urethane foam 29, can be suppressed.

  Furthermore, since the weight per unit volume of the outer peripheral portion of the urethane foam 29 is heavier than the weight per unit volume of the central portion, the warp deformation of the glass plate 25 and its progress over time are further suppressed. become. That is, since the glass plate 25 is filled and fired with urethane in a state in which its outer peripheral portion is warped in advance toward the outside of the door at the time of door molding, the glass plate 25 and the inner frame 23 The amount of urethane filled in between is larger than the central part, and this increased urethane is compressed by the heat shrinkage of the urethane itself and the restoring force to the flat state of the glass plate 25, and the weight per unit volume is the central part. It is heavier than As a result, as in the case of the foaming density described above, the outer peripheral portion of the urethane foam 29 is heavier than the heat shrinkage deformation of the central portion, so that the amount of urethane itself is increased and the heat shrinkage deformation is difficult. Therefore, the heat shrink deformation when viewed with the entire urethane foam is almost the same over the entire surface of the urethane foam, and the outer peripheral portion is unlikely to be warped. Therefore, the glass plate 25 is also prevented from being deformed in such a manner that its outer peripheral portion is warped, and can be made flatter. In addition, warpage deformation of the foamed urethane 29, that is, warpage deformation of the glass plate 25, which may progress with time due to a temperature difference between the inside and outside of the urethane foam 29, can be suppressed.

  In the door of this embodiment, since the vacuum heat insulating plate 30 is embedded in the urethane foam 29 between the inner frame 23 and the glass plate 25, the vacuum heat insulating plate 30 has rigidity and heat insulating properties. The heat shrink deformation of the urethane foam 29 can be suppressed, and the warp deformation of the glass plate 25 can be further reduced.

That is, the foamed urethane 29 is foamed while the filled urethane flows around the vacuum heat insulating plate 30 and flows from the glass plate 25 side to the inner frame 23 side, so the urethane foam 29a and the glass plate 25 on the inner frame 23 side are foamed. A difference occurs in the foaming density with the foamed urethane 29b on the side, the foaming density on the inner frame 23 side is increased, and the amount of urethane is also increased. Therefore, the urethane foam 29a on the inner frame 23 side is less likely to cause thermal shrinkage than the urethane foam 29b on the glass plate 25 side. Since the foamed urethane 29b on the inner frame 23 side is cooled by the cold air from the inside of the refrigerator and is likely to undergo thermal shrinkage, the foamed urethane 29b on the inner frame 23 side that is susceptible to thermal shrinkage is less likely to thermally shrink. Therefore, warpage deformation of the door as a whole can be reduced, and generation of warpage deformation of the glass plate 25 can be prevented.

  In addition, glass has a large specific heat, and once it is cooled by heat transfer from the inner frame 23, etc., it has a unique problem that it tends to sweat due to condensation due to contact with high humidity outside air or cold air when the door is opened and closed. Heat transfer is blocked by the vacuum heat insulating plate 30, and sweating can be prevented.

  On the other hand, the glass plate 25 prevented from warping deformation as described above has its outer peripheral edge positioned on the inner side of the outer peripheral edge 24a of the edge frame 24 as shown in FIG. It is possible to prevent the occurrence of cracking, chipping, etc., and it becomes highly reliable. That is, the glass plate 25 is bonded to the urethane foam 29 and is always stressed by the heat shrinkage force of the urethane foam 29, but the outer peripheral edge of the glass plate 25 is inside the edge frame 24. Since it is located and protected by the edge frame 24, it is possible to prevent an inadvertent application of an external force, and reliably prevent a glass plate that is easily damaged even if a slight external force is applied. It can be done.

  FIG. 7 shows a door manufacturing process in the present embodiment. As described above, in the door of this embodiment, urethane is foamed in a state where the outer peripheral portion of the glass plate 25 is warped outwardly from the door.

  Therefore, first, the glass plate 25 and the edge frame 24 are set to the door lower mold 33 from the state a, and then urethane is inserted into the space formed by the edge frame 24 and the glass plate 25 by the nozzle 34 as shown by b. Pour (fill) along the longitudinal direction of 25. Thereafter, as shown by c, the door upper mold 35 on which the inner frame 23 is set is pressed against the door lower mold 33, and the inner frame 23 is covered with the edge frame 24 and further pressurized with a predetermined pressure.

  Here, the door upper and lower molds 33 and 35 are formed in an arc shape such that the outer peripheral portion warps outwardly of the door as is apparent from the drawings. In this state, the urethane begins to foam and fills the glass plate 25, the edge frame 24, and the inner frame 23 as shown in FIG. When the door upper and lower molds 33 and 34 are separated from each other as indicated by e in this state, a door is obtained.

  At this time, the door has a curved shape as shown in e. At this point, the urethane foam 29 drops in temperature to near room temperature and causes thermal contraction. At the same time, the inner frame 23 also drops in temperature. Cause heat shrinkage. At that time, since the outer peripheral portion of the glass plate 25 is warped toward the outer side of the door together with the inner frame 23, this warpage is eliminated, and the warpage of the outer peripheral portion of the glass plate 25 is also caused by its own restoring force. The original state is restored and the entire surface becomes flat as indicated by f. Although the arc-shaped warpage dimension is exaggerated in the drawings, it is actually several millimeters, for example, about 1 to 2 mm.

In this case, that is, after the glass plate 25 and the edge frame 24 are arranged, the space formed by the edge frame 24 and the glass plate 25 is filled with urethane, and then the edge frame 24 and the glass plate 25 are not shown. The vacuum heat insulating plate 30 is arranged with a gap between the glass plate 25 and the inner frame 23 after that. As a result, the urethane foams while spreading from the upper surface of the glass plate 25 to the peripheral portion of the vacuum heat insulating plate 30, gets over the peripheral portion of the vacuum heat insulating plate 30 as it is, and goes around between the vacuum heat insulating plate 30 and the inner frame 23. The foam is solidified in a form that surrounds the vacuum heat insulating plate 30. That is, the vacuum heat insulating plate 30 can be embedded in the foamed urethane 29 at the time of door molding, and productivity is improved.

  In this embodiment, as already described, a resin film 27 is attached to the inner surface of the glass plate 25 via an adhesive 26, and a colored layer 28 is formed on the resin film 27. Since the layer 28 can be formed by a roller or the like, the adhesive strength with respect to the resin film 27 can be managed and ensured even if the adhesive state deteriorates due to thermal shrinkage or aging of the urethane foam 29. It is possible to reliably prevent peeling.

  As a result, when the resin film 27 is positioned between the glass plate 25 and the urethane foam 29 and both are adhered by the adhesive force of the urethane foam 29 and the adhesive 26, the colored layer 28 is peeled off from the resin film 27. It is possible to prevent the glass plate 25 from being peeled off from the foamed urethane 29 due to the peeling. Therefore, the adhesive strength of the glass plate with film 25 can be maintained and secured over a long period of time, and the reliability can be improved.

  In addition, in this embodiment, the foaming density of the urethane foam 29 is higher in the outer peripheral portion than in the central portion of the glass plate 25, so that the adhesive strength of the urethane foam 29 is higher in the outer peripheral portion of the glass plate 25. Become stronger. Thereby, the adhesive force between the resin film 27 of the glass plate 25 and the urethane foam 29 can be more reliably maintained and secured over a long period of time.

  That is, the refrigerator has a large temperature difference between the inside and the outside, and the end of the glass plate 25 of the door is affected by condensation and severe temperature changes due to the 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 severe impact during opening and closing, or the door including the glass plate 25 may overflow with water or juice when the stored items are put in and out. The end portion of the glass plate 25 is easily peeled off from the urethane foam 29 if there is no glass plate insertion portion that covers the end portion of the glass plate due to the use environment / actual condition unique to the refrigerator.

  Under such circumstances, in this embodiment, the end portion of the glass plate 25, that is, the peripheral portion is bonded to the urethane skin layer in which the foaming density of the urethane foam 29 is high, that is, very finely foamed. In addition, the adhesive density between the urethane foam 29 and the resin film 27 of the glass plate 25 is high and strong. Therefore, even when used for a long time, the adhesion between the resin film 27 of the glass plate 25 and the urethane foam 29 is ensured, and the adhesive strength of the glass plate 25 with the film can be maintained and ensured for a long time, so that the reliability can be ensured. is there.

  Further, since the outer peripheral portion of the glass plate 25 is bonded to the edge frame 24 via the double-sided tape 31, water, juice, etc. that permeate the door outer peripheral portion penetrates to the bonding surface between the urethane foam 29 and the glass plate 25. This can be prevented by the double-sided tape 31, the adhesive strength of the glass plate 25 can be maintained and secured for a longer period, and the reliability can be further improved.

  In addition, in this embodiment, since the easy-adhesion layer 32 is formed on the adhesive surface of the resin film 27 with the foamed urethane 29, the adhesive strength between the resin film 27 and the foamed urethane 29 becomes higher, and the foamed urethane. It is possible to more reliably prevent the resin film 27 from 29, and hence the glass plate 25, from peeling off, and to maintain and ensure the adhesive strength of the glass plate 25 with a film for a long time.

In particular, as exemplified in this embodiment, when polyethylene terephthalate is used as the resin film 27 and the easy-adhesion layer 32 is a urethane-based or polyester-based adhesive, the adhesive strength becomes strong. That is, the urethane or polyester constituting the urethane adhesive or polyester adhesive has a solubility parameter (hereinafter referred to as SP value) of SP of 10 to 11 of urethane and SP of polyethylene terephthalate which is a film material. Since the value is close to 11.3, the adhesive force between them becomes strong. In other words, the polyester-based (urethane-based) adhesive has a —OH group reacted with isocyanate at the end to form a urethane-modified resin film, while the urethane foam 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, even when used for a long period of time, the adhesion between the resin film 27 of the glass plate 25 and the urethane foam 29 can be ensured, and the adhesion strength of the glass plate 25 with a film can be maintained and ensured for a long period of time.

  In addition, the microscopic surface of the adhesive surface between the resin film 27 and the foamed urethane 29 is bonded to the urethane foam skin layer and the resin film 27. The skin layer and the resin film 27 are both of them. Since the surface is a smooth surface, there is a risk of peeling at once if it is peeled off. In particular, when the foaming density of the outer peripheral portion of the glass plate is increased and the adhesive surface is used as a skin layer, there is a risk that peeling will spread at the outer peripheral portion of the glass plate.

  However, in this embodiment, as described above, since the easy adhesion layer 32 is formed on the adhesive surface of the resin film 27 with the urethane foam 29, the adhesive strength between the resin film 27 and the urethane foam 29 is enhanced, The spread of peeling between the foamed urethane skin layer and the resin film 27 can be prevented. Therefore, the adhesive strength between the resin film 27 on the inner surface of the glass plate and the urethane foam 29 can be maintained and ensured over a long period of time, and the reliability can be further improved.

  Further, the adhesive strength can be improved even at the central portion of the glass plate where the foam density of urethane is low and the substantial adhesion area between the urethane foam 29 and the resin film 27 is reduced. In other words, the portion of the urethane foam 29 having a low foaming density and the substantial adhesion area between the foamed urethane 29 and the resin film 27 is reduced by covering the adhesive force with the easy-adhesive layer 32, thereby adhering the foamed urethane 29 and the resin film 27. The strength can be further ensured, and as a result, the adhesive strength of the glass plate 25 can be maintained and ensured over a long period of time, and the reliability can be increased.

  The adhesive strength between the glass plate 25 and the urethane foam 29 was subjected to a life acceleration test, and as a result, the adhesive strength was 1.0 g / cm 2 or more, preferably 2.6 g / cm 2 or more. Even if the adhesive strength is deteriorated due to aging such as heat shrinkage, the adhesive strength between the resin film 27 and the urethane foam 29 can be reliably ensured, and as a result, the adhesive strength of the glass plate 25 is maintained and guaranteed over a long period of time. And was able to be reliable. The method for measuring the adhesive force is described in “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.

Furthermore, in this embodiment, a portion of the edge frame 24 of the inner frame 23 positioned on the lower end surface of the glass plate 25 is superposed on the lower end surface of the glass plate without jumping forward from the front surface of the glass plate 25. Since the plate support piece 24 b is positioned, the glass plate 25 is supported by the glass plate support piece 24 b of the edge frame 24 of the inner frame 23. Therefore, even if the peeling of the glass plate 25 may partially occur due to the deterioration of the adhesive force of the glass plate 25 by the urethane foam 29, an abnormal situation such as the dropping of the glass plate 25 is surely prevented. This will greatly improve your sense of security. Further, since the glass plate support piece 24b of the edge frame 24 does not protrude from the front surface of the glass plate, it is not visible from the front surface of the door as in the glass plate insertion portion, and the design and the flat feeling of the entire surface can be maintained. .

  In addition, even if some external force is applied to the glass plate 25, the 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.

  As mentioned above, although main embodiment of this invention was described, the said embodiment was shown as an example in implementing this invention, and can be variously changed within the range which achieves the objective of this invention. Needless to say.

  For example, the glass plate may be replaced with a transparent resin plate, which makes it possible to further secure the adhesive strength by reducing the weight and to reduce the cost.

  Further, 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 side as described above, and a urethane binder or an adhesive 26 used for improving the adhesive strength between the resin film 27 and the urethane foam 29 may be used. A vapor-deposited layer may be used, or a vapor-deposited layer and / or a urethane binder may be further interposed between the adhesive 26 and the foamed urethane 29. Designability can be improved.

  As described above, the present invention eliminates the transparent front plate insertion portion such as a colored glass plate and improves the design, while preventing the warp deformation of the transparent front plate, and the flatness of the transparent front plate over a long period of time. It is possible to provide a refrigerator door that can maintain a good design and maintain good design, and can be widely applied to refrigerators and wine coolers for business use as well as general use.

DESCRIPTION OF SYMBOLS 1 Refrigerator main body 2 Outer box 3 Inner box 4 Urethane foam 5 Refrigeration room 6 Switching room 7 Ice making room 8 Freezing room 9 Vegetable room 10, 11, 12, 13, 14 Door 16 Cooling room 17 Cooler 18 Air blower fan 19 Compressor 20 Radiation pipe 21 Capillary tube 23 Inner frame 24 Edge frame 24a Outer peripheral edge 24b Transparent front plate support piece (glass plate support piece)
25 Transparent front plate (glass plate)
26 Adhesive 27 Resin film 28 Colored layer 29, 29a, 29b Urethane foam 30 Vacuum heat insulating plate 31 Double-sided tape 32 Easy adhesive layer 33 Door bottom mold 34 Nozzle 35 Door top mold

Claims (9)

A door for opening and closing a storage room of a refrigerator, the door having an inner frame positioned inside the storage room, and a colored layer of a glass plate disposed on an edge frame of the inner frame so as to cover the inner frame It consists of a transparent front plate and urethane foam filled and foamed in the space between the transparent front plate, the inner frame and the edge frame, and the transparent front plate is bonded and held by foamed urethane, and its outer periphery is transparent The transparent front plate is configured to be exposed as it is without being covered with a front plate insertion portion or the like, and the dimensional difference in the longitudinal direction between the long side longitudinal direction center and the end is long with respect to at least the long side longitudinal direction perpendicular line. Refrigerator door in which the foamed urethane is within 0.5% of the dimension in the longitudinal direction of the side, and the foamed urethane has a foam density higher than that of the central part . A door for opening and closing a storage room of a refrigerator, the door having an inner frame positioned inside the storage room, and a colored layer of a glass plate disposed on an edge frame of the inner frame so as to cover the inner frame It consists of a transparent front plate and urethane foam filled and foamed in the space between the transparent front plate, the inner frame and the edge frame, and the transparent front plate is bonded and held by foamed urethane, and its outer periphery is transparent The transparent front plate is configured to be exposed as it is without being covered with a front plate insertion portion or the like, and the dimensional difference in the longitudinal direction between the long side longitudinal direction center and the end is long with respect to at least the long side longitudinal direction perpendicular line. Refrigerator door in which the weight per unit volume of the outer peripheral part is heavier than the weight per unit volume of the central part within 0.5% of the side longitudinal dimension. The refrigerator door according to claim 1 or 2, wherein the transparent front plate is filled and foamed with urethane foam in a state where the outer peripheral portion of the transparent front plate is bent outward. The refrigerator door according to claim 1 or 2, wherein the transparent front plate has a coefficient of linear expansion set smaller than that of urethane foam. The refrigerator door according to any one of claims 1 to 4 , wherein a vacuum heat insulating plate is embedded in foamed urethane between the inner frame and the transparent front plate. The outer peripheral edge refrigerator door according to any one of claims 1 to 5 is located inside the outer peripheral edge of the edge frame of the transparent front plate. After setting the transparent front plate and the edge frame in the mold, and then filling the space formed by the edge frame and the transparent front plate with urethane, the inner frame is put on the edge frame and pressed at a predetermined pressure to make the transparent A method for manufacturing a refrigerator door in which urethane is foamed with the outer peripheral portion of the front plate bent outward, and the transparent front plate, edge frame, and inner frame are integrated with foamed urethane. After arranging the edge frame on the outer peripheral portion of the transparent front plate, the vacuum heat insulating plate is arranged with a gap between the transparent front plate in the space constituted by the edge frame and the transparent front plate, and then the edge frame and The manufacturing method of the door for refrigerators of Claim 7 which fills and foams the space comprised with the transparent front board. The refrigerator door which replaced the said glass plate of Claims 1-6 with the resin plate.