JP2012159241A - Heat insulation box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat insulation box, wherein the insulation efficiency thereof is maintained for a long period in use of the heat insulation box, and a used heat insulation box facilitates a collection of a vacuum heat insulating material therefrom when being disposed.SOLUTION: In the heat insulation box 1, the vacuum heat insulating material 10 where a core material, a water adsorbent and an air absorbent are decompressed and sealed in a gas barrier laminated film is bonded to an inner face of an outer box 2 with adhesive, and a space formed of the outer box 2 and an inner box 3 is filled with a urethane foam insulation 4. The adhesive preponderantly bonds an outer periphery of the vacuum heat insulating material 10 along an edge of the core material of the vacuum heat insulating material 10 so that a bonded surface bonding the vacuum heat insulating material 10 and the center of the vacuum heat insulating material 10 being a predetermined width or more away from the edge of the core material of the vacuum heat insulating material 10 in the outer box 2 are not bonded and the urethane foam insulation 4 does not enter a gap between the bonded surface bonding the vacuum heat insulating material 10 and the center of the vacuum heat insulating material 10 in the outer box 2.

Description

  The present invention relates to a heat insulating box having a vacuum heat insulating material and a urethane foam heat insulating material between an outer box and an inner box.

  In recent years, energy-saving technology has attracted attention, and various products such as refrigerators and vending machines equipped with vacuum insulation have been released and gained popularity. This vacuum heat insulating material is one in which a core material such as glass wool and an adsorbent are sealed under reduced pressure in a gas barrier outer covering material, and has a heat insulating performance about 20 times that of a conventional urethane foam, It has been attracting attention as an effective means to save energy while satisfying customer demands for refrigerators that have a large internal volume for their external dimensions.

  However, there are still problems in recycling refrigerators equipped with vacuum insulation. Vacuum insulation is mainly made by inserting a porous core material such as glass wool together with an adsorbent into a bag-like aluminum laminate film and sealing it under reduced pressure. Therefore, as with conventional refrigerator recycling systems, If the heat insulation box is crushed as it is, urethane foam and glass wool are mixed after crushing, making it difficult to solidify urethane and making it difficult to recycle urethane.

  Therefore, as a preferable recycling method of the refrigerator equipped with a vacuum heat insulating material, it is necessary to take out the vacuum heat insulating material before crushing.

  Therefore, as a method of facilitating the desorption of the vacuum heat insulating material in the refrigerator, the vacuum heat insulating material itself is serviced by applying the vacuum heat insulating material to the place where it is not in close contact with the foam heat insulating material and can be easily detached from the outside. There has been proposed a refrigerator that facilitates replacement and can contribute to the improvement of the internal volume by reducing the thickness of the heat insulating material as in the past (see, for example, Patent Document 1).

Japanese Patent No. 3811963

  However, in the above conventional configuration, it is easy to remove the vacuum heat insulating material from the refrigerator, but the shape of the outer box or the inner box is complicated compared to the case where the vacuum heat insulating material is embedded in the urethane foam heat insulating material. As a result, the manufacturing cost of the heat insulation box constituting the refrigerator main body increases, the strength of the heat insulation box constituting the refrigerator main body decreases, or the gas easily enters the vacuum heat insulating material. There was a problem that led to deterioration of heat insulation performance of the material, deterioration of energy saving performance due to deterioration of heat insulation performance, and environmental deterioration such as increase of carbon dioxide emission due to increased power consumption.

  The present invention solves the above-described conventional problems, and can maintain the heat insulation performance of the heat insulation box for a long time when the heat insulation box is used, and vacuum insulation from the heat insulation box when the used heat insulation box is discarded. It aims at providing the heat insulation box which is easy to collect | recover materials.

In order to achieve the above object, the heat insulating box of the present invention comprises a vacuum heat insulating material obtained by sealing at least a core material, a moisture adsorbent and an air adsorbent in a gas barrier laminate film, and an inner surface of the outer box. Or an adhesive box that is bonded to the outer surface of the inner box with an adhesive, and a urethane foam heat insulating material is filled in a space formed by the outer box and the inner box, and the adhesive is the outer box or The bonding surface for bonding the vacuum heat insulating material in the inner box and the central portion of the vacuum heat insulating material separated from the edge of the core material portion of the vacuum heat insulating material by a predetermined width or more are not bonded, and the bonding surface and the vacuum heat insulating material The outer peripheral portion of the vacuum heat insulating material is preferentially adhered along the edge of the core material portion of the vacuum heat insulating material so that the urethane foam heat insulating material does not enter the gap with the central portion of the vacuum heat insulating material.

  In the above configuration, the vacuum heat insulating material seals the moisture adsorbent and the air adsorbent together with the core material under reduced pressure, so that air and moisture entering from the outside are adsorbed by the moisture adsorbent and the air adsorbent, and the air adsorbent It is possible to suppress the deterioration due to moisture adsorption with the moisture adsorbent, maintain the reduced pressure state for a long time, and maintain the high heat insulation performance of the vacuum heat insulating material for a long time.

  Further, a vacuum heat insulating material is disposed in a space formed by the outer box and the inner box, and a space other than the vacuum heat insulating material in the space formed by the outer box and the inner box is filled with urethane foam heat insulating material. Therefore, compared to the case where the vacuum heat insulating material is disposed outside the space formed by the outer box and the inner box, air and moisture are less likely to enter the vacuum heat insulating material, and the air and moisture are less likely to enter the vacuum heat insulating material. The increase in the internal pressure of the vacuum heat insulating material due to the penetration and the deterioration of the heat insulating performance of the vacuum heat insulating material due to the increase in the internal pressure are unlikely to occur.

  Therefore, the heat insulation performance of the heat insulation box which has this vacuum heat insulating material can be maintained over a long period of time.

  The vacuum heat insulating material is bonded to the inner surface of the outer box or the outer surface of the inner box with an adhesive, and the adhesive is bonded to the vacuum insulating material on the outer box or the inner box and the vacuum heat insulating material. The center part of the vacuum heat insulating material that is more than a predetermined width away from the edge of the core part (the part where the core material is between the laminated films on both sides) is not bonded, and the bonding surface and the central part of the vacuum heat insulating material Since the outer peripheral portion of the vacuum heat insulating material is adhered along the edge of the core material portion of the vacuum heat insulating material so that the urethane foam heat insulating material does not enter the gap, the vacuum heat insulating material is attached to the outer box and the inner box. Compared to the case where it is buried in urethane foam insulation in the middle of the box, or the case where one side of the vacuum insulation core is bonded almost entirely to the inner surface of the outer box or the outer surface of the inner box with an adhesive Therefore, it is easy to collect the vacuum insulation without damaging it.

  From the above, the present invention can maintain the heat insulating performance of the heat insulating box for a long time when the heat insulating box is used, and can easily collect the vacuum heat insulating material from the heat insulating box when the used heat insulating box is discarded. An insulated box can be provided.

  The present invention provides a heat insulating box that can maintain the heat insulating performance of the heat insulating box for a long time when the heat insulating box is used, and that can easily collect the vacuum heat insulating material from the heat insulating box when the used heat insulating box is discarded. can do.

Cross-sectional view of the heat insulation box in Embodiment 1 of the present invention Sectional drawing of the vacuum heat insulating material used for the heat insulation box of the embodiment The top view which looked at the vacuum heat insulating material used for the heat insulation box of the embodiment from the adhesive side

1st invention adhere | attaches the vacuum heat insulating material formed by pressure-reducing sealing at least a core material, a water | moisture-content adsorbent, and an air adsorbent in the gas barrier laminate film on the inner surface of an outer box, or the outer surface of an inner box with an adhesive agent And a space formed by the outer box and the inner box is filled with a urethane foam heat insulating material, and the adhesive bonds the vacuum heat insulating material in the outer box or the inner box. The urethane foam is formed in the gap between the bonding surface and the central portion of the vacuum heat insulating material without being bonded to the central portion of the vacuum heat insulating material that is separated from the edge of the core portion of the vacuum heat insulating material by a predetermined width or more. The outer peripheral part of the vacuum heat insulating material is preferentially bonded along the edge of the core part of the vacuum heat insulating material so that the heat insulating material does not enter.

  In the above configuration, the vacuum heat insulating material seals the moisture adsorbent and the air adsorbent together with the core material under reduced pressure, so that air and moisture entering from the outside are adsorbed by the moisture adsorbent and the air adsorbent, and the air adsorbent It is possible to suppress the deterioration due to moisture adsorption with the moisture adsorbent, maintain the reduced pressure state for a long time, and maintain the high heat insulation performance of the vacuum heat insulating material for a long time.

  Further, a vacuum heat insulating material is disposed in a space formed by the outer box and the inner box, and a space other than the vacuum heat insulating material in the space formed by the outer box and the inner box is filled with urethane foam heat insulating material. Therefore, compared to the case where the vacuum heat insulating material is disposed outside the space formed by the outer box and the inner box, air and moisture are less likely to enter the vacuum heat insulating material, and the air and moisture are less likely to enter the vacuum heat insulating material. The increase in the internal pressure of the vacuum heat insulating material due to the penetration and the deterioration of the heat insulating performance of the vacuum heat insulating material due to the increase in the internal pressure are unlikely to occur.

  Therefore, the heat insulation performance of the heat insulation box which has this vacuum heat insulating material can be maintained over a long period of time.

  The vacuum heat insulating material is bonded to the inner surface of the outer box or the outer surface of the inner box with an adhesive, and the adhesive is bonded to the vacuum insulating material on the outer box or the inner box and the vacuum heat insulating material. The center part of the vacuum heat insulating material that is more than a predetermined width away from the edge of the core part (the part where the core material is between the laminated films on both sides) is not bonded, and the bonding surface and the central part of the vacuum heat insulating material Since the outer peripheral portion of the vacuum heat insulating material is adhered along the edge of the core material portion of the vacuum heat insulating material so that the urethane foam heat insulating material does not enter the gap, the vacuum heat insulating material is attached to the outer box and the inner box. Compared to the case where it is buried in urethane foam insulation in the middle of the box, or the case where one side of the vacuum insulation core is bonded almost entirely to the inner surface of the outer box or the outer surface of the inner box with an adhesive Therefore, it is easy to collect the vacuum insulation without damaging it.

  From the above, the first invention can maintain the heat insulating performance of the heat insulating box for a long time when the heat insulating box is used, and collect the vacuum heat insulating material from the heat insulating box when the used heat insulating box is discarded. It is possible to provide a heat-insulating box that is easy to do.

  In particular, the second invention uses a thermally expandable adhesive as the adhesive of the first invention. The thermally expandable adhesive expands at a high temperature and loses its adhesive strength. Even when cooled, the expanded state is maintained, so that it can be easily separated from an adherend such as an outer box or an inner box at room temperature.

  Hereinafter, embodiments of the heat insulating box of the present invention will be described with reference to the drawings. In addition, this invention is not limited by this embodiment.

(Embodiment 1)
FIG. 1 is a cross-sectional view of a heat insulating box according to Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view of the vacuum heat insulating material used for the heat insulating box of the embodiment before fin folding. FIG. 3: is the top view which looked at the vacuum heat insulating material after the fin folding used for the heat insulation box of the embodiment from the adhesive agent side.

  As shown in FIGS. 1 to 3, the heat insulating box 1 of the present embodiment uses at least a core material 8 made of glass fiber, a moisture adsorbent 6 made of calcium oxide, and ZSM-5 type zeolite exchanged with copper ions. The vacuum heat insulating material 10 obtained by sealing the air adsorbent 7 with the gas barrier property in two laminated films 9 under reduced pressure is adhered to the inner surface of the outer box 2 made of a steel plate with an adhesive 11. It is the heat insulation box 1 which filled the urethane foam heat insulating material 4 which applied the cyclopentane as a foaming agent in the space formed with the inner box 3 which consists of resin, such as ABS.

The adhesive 11 has a predetermined width or more from the edge of the adhesive surface in the outer box 2 to which the vacuum heat insulating material 10 is bonded and the core material portion of the vacuum heat insulating material 10 (the portion where the core material 8 is between the laminated films 9 on both sides). The central part of the vacuum heat insulating material 10 that is separated is not bonded, and the urethane foam heat insulating material 4 does not enter the gap between the bonding surface of the outer case 2 to which the vacuum heat insulating material 10 is bonded and the central part of the vacuum heat insulating material 10. The outer peripheral portion of the vacuum heat insulating material 10 is preferentially bonded along the edge of the core material portion of the vacuum heat insulating material 10.

  In the above configuration, since the vacuum heat insulating material 10 seals the moisture adsorbent 6 and the air adsorbent 7 together with the core material 8 under reduced pressure, the moisture adsorbent 6 and the air adsorbent 7 are used to remove air and moisture entering from the outside. The moisture adsorbent 6 prevents the air adsorbent 7 from adsorbing and deteriorating, and can maintain a reduced pressure state over a long period of time. The high thermal insulation performance of the vacuum heat insulating material 10 can be maintained over a long period of time. .

  Further, a vacuum heat insulating material 10 is disposed in a space formed by the outer box 2 and the inner box 3, and a space other than the vacuum heat insulating material 10 in the space formed by the outer box 2 and the inner box 3 is urethane foam heat insulating. Since the material 4 is filled, air and moisture enter the vacuum heat insulating material 10 as compared with the case where the vacuum heat insulating material 10 is disposed outside the space formed by the outer box 2 and the inner box 3. It is difficult to increase the internal pressure of the vacuum heat insulating material 10 due to the intrusion of air or moisture into the vacuum heat insulating material 10 and to deteriorate the heat insulating performance of the vacuum heat insulating material 10 due to the increase of the internal pressure.

  Therefore, the heat insulation performance of the heat insulation box 1 having the vacuum heat insulating material 10 can be maintained over a long period of time.

  The vacuum heat insulating material 10 is bonded to the inner surface of the outer box 2 with an adhesive 11, and the adhesive 11 is bonded to the vacuum insulating material 10 in the outer box 2 and the edge of the core portion of the vacuum heat insulating material 10. The urethane foam heat insulating material 4 enters the gap between the bonding surface to which the vacuum heat insulating material 10 in the outer box 2 is bonded and the central portion of the vacuum heat insulating material 10 without being bonded to the central portion of the vacuum heat insulating material 10 separated by a predetermined width or more. Since the outer peripheral part of the vacuum heat insulating material 10 is intensively adhered along the edge of the core material part of the vacuum heat insulating material 10, the vacuum heat insulating material 10 is urethane between the outer box 2 and the inner box 3. Compared with the case where it is buried in the foam heat insulating material 4 or the case where one side of the core part of the vacuum heat insulating material 10 is bonded almost entirely to the inner surface of the outer box 2 or the outer surface of the inner box 3 with the adhesive 11. It is easy to collect the vacuum heat insulating material 10 without damaging it.

  In the present embodiment, a hot melt adhesive or a thermal expansion adhesive is applied to the adhesive 11.

  As the hot melt adhesive, for example, AZ7785 manufactured by Asahi Chemical Synthesis Co., Ltd. can be used. In addition, although urethane type and EVA type hot melt may be applied, the time from application to the vacuum heat insulating material 10 to application to the outer box 2 is different. The initial adhesiveness can be maintained by applying the adhesive to the vacuum heat insulating material 10 and then covering with a release paper or the like.

  The adhesive 11 is applied in the form of dots or a combination of dots and lines, and after the vacuum heat insulating material 10 is pasted on the outer box 2 or the inner box 3, until the foam foaming of the urethane foam heat insulating material 4 is formed. The vacuum heat insulating material 10 is temporarily fixed.

  The outer appearance deformation of the outer box 2 of the heat insulating box 1 is prevented by preventing the urethane foam heat insulating material 4 from entering the gap between the bonding surface for bonding the vacuum heat insulating material 10 in the outer box 2 and the central portion of the vacuum heat insulating material 10. Can be suppressed. Moreover, since the application quantity of the adhesive agent 11 is made into the minimum necessary, mold release with the outer box 2 or the inner box 3 becomes easy, and it can take out, without breaking the vacuum heat insulating material 10. The application area of the adhesive 11 is set to a range of 10% or less of the surface area of the core part on one side of the vacuum heat insulating material 10.

Laminate film 9 has a thickness of 15 μm as an innermost heat-bonding layer, a linear low-density polyethylene film with a thickness of 50 μm, a gas barrier layer as an intermediate layer, an aluminum foil with a thickness of 6 μm, and a surface protective layer as an outermost layer. Two layers of 25 μm nylon film are laminated.

  An aluminum vapor deposition film may be applied to the gas barrier layer, or a combination of an aluminum vapor deposition film and an aluminum foil may be applied.

  Since the vacuum heat insulating material 10 of the heat insulation box 1 of this Embodiment can maintain a pressure-reduced state over a long period of time and can maintain the high heat insulation performance of the vacuum heat insulating material 10 over a long period of time, the used heat insulation box 1 If there is no problem in the performance of the vacuum heat insulating material 10 taken out from the above, it can be reused as it is.

  When a thermal expansion type adhesive is applied to the adhesive 11, the thermal expansion type adhesive maintains its expanded state even after cooling at room temperature after it has expanded at a high temperature and lost its adhesive strength. It can be easily separated from the adherend such as the outer box 2 or the inner box 3 at room temperature.

  As described above, in the present embodiment, when the heat insulating box 1 is used, the heat insulating performance of the heat insulating box 1 can be maintained over a long period of time, and when the used heat insulating box 1 is discarded, from the heat insulating box 1 The heat insulation box 1 which can collect | recover the vacuum heat insulating material 10 easily can be provided.

  In this embodiment, the vacuum heat insulating material 10 is bonded to the inner surface of the outer box 2, but may be bonded to the outer surface of the inner box 3.

  The heat insulating box of the present invention can maintain the heat insulating performance of the heat insulating box for a long time when the heat insulating box is used, and it is easy to recover the vacuum heat insulating material from the heat insulating box when the used heat insulating box is discarded. It can also be applied to uses such as refrigerators, vending machines, hot water supply containers, heat insulating materials for buildings, heat insulating materials for automobiles, cold insulation and heat insulation boxes.

DESCRIPTION OF SYMBOLS 1 Heat insulation box 2 Outer box 3 Inner box 4 Urethane foam heat insulating material 6 Moisture adsorption agent 7 Air adsorption agent 8 Core material 9 Laminate film 10 Vacuum heat insulation material 11 Adhesive

Claims (2)

A vacuum heat insulating material formed by vacuum-sealing at least a core material, a moisture adsorbent, and an air adsorbent in a gas barrier laminate film is adhered to the inner surface of the outer box or the outer surface of the inner box with an adhesive, and the outer box And a space formed by the inner box and filled with urethane foam heat insulating material, wherein the adhesive is bonded to the outer surface or the inner box and the vacuum insulating material in the inner box and the vacuum The urethane foam heat insulating material does not enter the gap between the adhesive surface and the central portion of the vacuum heat insulating material without being bonded to the central portion of the vacuum heat insulating material that is more than a predetermined width away from the edge of the core portion of the heat insulating material. The heat insulation box which adhere | attaches the outer peripheral part of the said vacuum heat insulating material mainly along the edge of the core part of the said vacuum heat insulating material. The heat insulating box according to claim 1, wherein the adhesive is a thermal expansion adhesive.

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