JP2005283059A - Refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To preclude a clearance and separation from being generated in a vacuum insulation panel, and to maintain an excellent appearance after injecting a cellular insulating material, and excellent insulating performance over a long period, irrespective of a standing temperature environmental condition after applying an adhesive. <P>SOLUTION: In this refrigerator, the vacuum insulation panel 1 is arranged in an inside of an outer box 22, using the adhesive 7, and the cellular insulating material 24 is filled between the outer box 22 and an inner box 23 to constitute an insulator. The vacuum insulation panel 1 is provided with a core material 3, an adsorption member 4, and a sheathing member 2 for storing the core material 3 and the adsorption member 4, and comprising a gas barrier film. The adhesive 7 having more than 0 to 50% or less of rosin content is used to bond the vacuum insulation panel 1 to the outer box 22, and the adhesive 7 is applied onto the vacuum insulation panel 1, with 180 μm or more of thickness. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a refrigerator using a vacuum heat insulation panel.

  In recent years, from the viewpoint of global warming, the necessity of reducing the power consumption of home appliances has been screamed. In particular, a refrigerator is a product that consumes a particularly large amount of power consumption among household electrical appliances, and reducing the power consumption of the refrigerator is indispensable as a measure against global warming. If the load in the refrigerator is constant, the power consumption of the refrigerator is largely determined by the heat insulation performance of the heat insulating material related to the efficiency of the compressor for cooling the refrigerator and the amount of heat leakage from the refrigerator. In this technical development, it is necessary to improve the efficiency of the compressor and the performance of the heat insulating material.

  As an example of improving the performance of a heat insulating material, use of a vacuum heat insulating panel in which a core material is covered with a jacket material made of a gas barrier film and the inside is sealed under reduced pressure has been used.

  As a conventional vacuum heat insulating panel fixing method, there is one disclosed in Patent Document 1. The fixing method of the vacuum heat insulation panel shown here is that the vacuum heat insulation panel is fixed to the outer box with a heat-curing double-sided tape, and cured by the reaction heat when the foam heat insulating material is cured. It is fixed to the outer box. Patent Document 1 describes that the fixing method of the vacuum heat insulation panel is applied to a refrigerator or the like.

  Another conventional vacuum heat insulation panel fixing method is disclosed in Patent Document 2. The fixing method of the vacuum heat insulation panel shown here fixes a vacuum heat insulation panel to a heat insulation wall surface (inside of an outer box iron plate) via a magnet. Patent Document 2 describes that the method for fixing a vacuum heat insulation panel is applied to a refrigerator or the like.

  In addition, when the vacuum heat insulation panel is disposed inside the refrigerator outer box, a method of applying an adhesive to the vacuum heat insulation panel or the outer box and bonding the vacuum heat insulation panel to the outer box and fixing it has become mainstream. . In the column of the prior art in Patent Document 3, it is described that a vacuum panel is attached to the inner surface on one side of the outer plate with a double-sided tape or a hot melt adhesive.

Japanese Unexamined Patent Publication No. 6-194030

JP-A-9-166271 Japanese Unexamined Patent Publication No. 1-263041

  However, in the vacuum heat insulation panel fixing method of Patent Document 1, since the vacuum heat insulation panel is fixed to the metal outer box with a heat-curing double-sided tape, the vacuum heat insulation panel is attached to the outer case in the previous assembly stage before the foam heat insulating material is injected. There is a possibility that the vacuum heat insulation panel is in a state of being displaced from a predetermined attaching position or being peeled off when the foam heat insulating material is injected. If the vacuum insulation panel is not in the predetermined attachment position when injecting foam insulation, it will not only impair the appearance of the refrigerator after injection of foam insulation, but also increase the amount of heat leakage and power consumption of the refrigerator. there were.

  Moreover, in the vacuum heat insulation panel fixing method of patent document 2, since the vacuum heat insulation panel is being fixed to the heat insulation wall surface (outer box iron plate) via the magnet, it is necessary to use a magnetic body layer for the jacket material of a vacuum heat insulation panel. is there. By using a magnetic material layer for the jacket material of the vacuum heat insulation panel, the heat bridge of the vacuum heat insulation panel itself is increased. As a result, the refrigerator in which the vacuum heat insulation panel is attached and fixed to the refrigerator There was a problem that power consumption increased.

  Further, the method of applying an adhesive to the vacuum heat insulating panel or the outer box and bonding the vacuum heat insulating panel to the outer box and fixing it has the following problems. In the refrigerator manufacturing process, after applying adhesive to the vacuum insulation panel or outer box and then leaving it for a while until the next bonding process, or applying adhesive to the vacuum insulation panel or outer box and pasting After that, when left for a while until the next manufacturing process, the vacuum heat insulation panel may float or peel depending on the surrounding environment such as ambient temperature and humidity. At this time, it is necessary to perform the process of applying the adhesive again and the process of attaching the vacuum heat insulation panel again, leading to a reduction in efficiency.

  The object of the present invention is to provide a foam insulation that does not float or peel off the vacuum insulation panel regardless of the ambient temperature environment conditions after application of the adhesive when the vacuum insulation panel is provided on the refrigerator box and the door. An object of the present invention is to provide a refrigerator that can maintain a good appearance and excellent heat insulation performance over a long period of time after pouring, and a method for producing the same.

  In order to achieve the above-mentioned object, a vacuum heat insulation panel is arranged between the outer box and the inner box, and in the refrigerator configured with a heat insulating material by filling a foam heat insulating material between the outer box and the inner box, In the present invention, the vacuum heat insulation panel is adhered to the inside of the outer box using an adhesive, and the rosin content of the adhesive is greater than 0% and less than 50%, and the adhesive is applied to the vacuum heat insulation panel. It is applied with a thickness of 180 μm or more.

  According to the present invention, the vacuum insulation panel does not float or peel regardless of the standing temperature environment conditions after the adhesive coating, and has a good appearance and excellent heat insulation performance over a long period after the foam insulation is injected. A refrigerator that can be maintained can be provided.

(Example)
Hereinafter, the refrigerator of one Example of this invention is demonstrated using FIG.1 and FIG.2. The refrigerator shown in the present invention includes a vending machine, a product display shelf, a product display case, a cool box, a cooler box, a refrigeration / freezer car, etc., in addition to a refrigerator and freezer for home use and business use.

  First, the configuration of the refrigerator according to the present embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is a perspective view of a refrigerator showing an embodiment of the present invention, and FIG. 2 is a cross-sectional view of the main part of FIG.

  The refrigerator includes a heat insulating box 21 that forms a heat insulator and a heat insulating door that forms the heat insulator. The heat insulating box 21 includes a metal outer box 22, a synthetic resin inner box 23, a plurality of vacuum heat insulating panels 1 arranged using an adhesive 7 inside the outer box, the outer box 22 and the inner box. And a foam heat insulating material 24 filled in between. The vacuum heat insulation panel is attached to a predetermined position inside the outer box 22 with an adhesive 7. By setting it as the heat insulation box 21 using the vacuum heat insulation panel 1 which concerns, the refrigerator with little heat leak amount and power consumption can be provided.

  The heat insulation box 21 is formed with a plurality of storage chambers whose front surfaces are open. These storage rooms are partitioned into a refrigeration room, a vegetable room, a freezing room, and an ice box, and are cooled to a predetermined low temperature suitable for each by a cooler disposed in the storage. In addition, the wall thickness of a heat insulation box is about 20 mm-50 mm.

  Although the heat insulation door is not illustrated, it is provided so as to open and close the front opening of each storage chamber. As with the heat insulating box 21, the heat insulating door is made of a metal outer box, a synthetic resin inner box, a plurality of vacuum heat insulating panels attached to the inner side of the outer box with an adhesive, an outer box and an inner box. It consists of a foam heat insulating material filled between. Here, the foam heat insulating material 24 is exemplified by a hard resin foam such as a hard urethane foam, a phenol foam, and a styrene foam.

  Among these, a rigid polyurethane foam using cyclopentane and water as a mixed foaming agent is preferable. The rigid polyurethane foam is obtained by reacting an isocyanate with a polyol as a basic raw material in the presence of a foaming agent, a foam stabilizer, and a reaction catalyst.

  The vacuum heat insulation panel 1 includes a core material 3, an adsorbing member 4, and an outer covering material 2 that houses the core material 3 and the adsorbing member 4 and is made of a gas barrier film. The vacuum heat insulation panel 1 has a core material 3 and an adsorbing member 4 inserted into the jacket material 2, and the inside of the jacket material 2 is depressurized and the peripheral portion of the jacket material 2 is heat-sealed. It is produced by sealing. The shape of the vacuum heat insulation panel 1 is not specifically limited, The thing of various shapes and thickness is applicable according to the location and workability | operativity applied.

  The core material 3 is produced by bonding a short glass fiber material having an average fiber diameter of 2 μm or more and 4 μm or less with a boric acid binder, forming into a plate shape, and performing an aging treatment at 200 ° C. or more for 1 hour. By this treatment, it is possible to remove a trace amount of water adhering to the core material 3. The short glass fiber material having an average fiber diameter of 2 μm or more and 4 μm or less is hardened with a water glass binder, and after forming into a plate shape, the core material 3 may be produced by performing an aging treatment at 200 ° C. or more for 1 hour. .

  For the purpose of dehydration and degassing of the core material 3, it is effective to perform aging of the core material before insertion into the jacket material 2. The heating temperature at this time is desirably 110 ° C. or higher, and more preferably 180 ° C. or higher, because it is possible to remove the adhering water as a minimum. As a result of examining the moisture content and water absorption rate, etc. for the optimal aging treatment temperature, the moisture content of the plate-like core material decreased to 1/70 of the core material without treatment in the aging treatment at 180 ° C. for 1 hour. It has also been found that the water absorption rate is less than that at 110 ° C. for 1 hour. Therefore, it is more preferable that the aging temperature of the core material is 180 ° C. or higher.

  The short glass fiber material preferably has an average fiber diameter of 2 to 4 μm. The short glass fiber material greatly affects the thermal conductivity characteristics and cost depending on the average fiber diameter. Glass wool having an average fiber diameter of 5 μm or more, which has been used as the mainstream of glass fibers, is a material that is easy to put into practical use because it is inexpensive in terms of cost, but its thermal conductivity and deterioration over time are greatly inferior. The reason for this is that the fibers are arranged in the same direction and the contact of the fibers is close to the line, and the fibers are double-bonded with a binder, the contact thermal resistance is reduced, the thermal conductivity is increased, and the deterioration with time progresses rapidly. It is done. On the other hand, if the average fiber diameter is less than 2 μm, the thickness per sheet is thin and the heat insulation performance is poor. Therefore, by increasing the thickness by stacking sheet-like inorganic fiber aggregates, it is possible to reduce thermal conductivity and deterioration with time. However, by stacking sheet-like inorganic fiber aggregates to increase the thickness, the number of sheets used for the core material increases, resulting in poor productivity and high cost. It was also found that when the vacuum heat insulating panel was produced with an average fiber diameter of less than 2 μm, the thickness reduction rate of the core material increased before and after sealing.

  As described above, since the thermal conductivity is increased when the fiber diameter is 5 μm or more, a fiber material that is discontinuous in the heat transfer direction and that effectively uses the contact resistance between the materials is selected. In addition to the contact thermal resistance, the heat flow path becomes zigzag, and a short glass fiber material having an average fiber diameter of 3 to 5 μm is selected from many fiber materials whose thermal resistance increases and thermal conductivity decreases. Therefore, it is possible to achieve both reduction in thermal conductivity and deterioration with time, reduction in thickness reduction rate, and cost reduction.

  In addition, about the fiber direction of a short glass fiber material, what is arranged along with a horizontal direction with respect to the thickness direction of a vacuum heat insulation panel is preferable at the point of heat insulation performance.

  Examples of the inorganic binder include boric acid, water glass, aluminum chelate, colloidal silica, and alumina sol. Of these, boric acid, which has excellent thermal conductivity over time and does not exert a chemical action on the short glass fiber material used for the core material, is most preferable.

  The outer covering material 2 is a polyethylene terephthalate film (12 μm) on which aluminum is deposited as a surface protective layer from the outer layer, an aluminum foil (6 μm) as a gas barrier layer, a high-density polyethylene film (50 μm) as a heat-sealing layer, and scratch resistance. For improvement, the outermost layer is composed of a laminate film using a polyamide film (15 μm) as a surface protective layer, and is used as a bag in which the heat fusion layers are bonded to each other at the end surfaces.

  This is because the outermost layer of the outer cover material 2 is to cope with impacts, the intermediate layer is to ensure gas barrier properties, and the innermost layer is hermetically sealed by heat sealing. Therefore, all known materials can be used as long as they meet these purposes. Further, as a means for further improvement, a puncture resistance may be improved by applying a surface protective layer to the outermost layer, or two films having an aluminum vapor deposition layer may be provided as an intermediate layer. As the innermost layer to be heat-sealed, polypropylene resin or polyacrylonitrile resin may be used.

  The jacket material 2 will be described more specifically. The jacket material covers the core material in order to provide an airtight portion inside, and the material configuration is not particularly limited. For example, a plastic laminate film made of polyethylene terephthalate resin in the outermost layer, aluminum foil in the intermediate layer, and high-density polyethylene resin in the innermost layer, for example, ethylene-vinyl having a polyethylene terephthalate resin in the outermost layer and an aluminum vapor deposition layer in the intermediate layer Examples include an alcohol copolymer resin (trade name EVAL, manufactured by Kuraray Co., Ltd.), and a plastic laminate film made of a high-density polyethylene resin in the innermost layer in a bag shape. These layers of the jacket material are for the outermost layer to cope with impacts, the intermediate layer is for securing gas barrier properties, and the innermost layer is sealed by heat fusion. Therefore, all known materials can be used as long as they meet these purposes.

  As a means for further improvement, puncture resistance may be improved by applying a polyamide resin or the like to the outermost layer, or two layers of an ethylene-vinyl alcohol copolymer resin having an aluminum vapor deposition layer may be provided as an intermediate layer. . The innermost layer to be heat-sealed is preferably a high-density polyethylene resin from the viewpoint of sealing properties, chemical attack properties, etc. In addition to this, polypropylene resin or polyacrylonitrile resin may be used. As a specific configuration of the material of the jacket material, for example, an aluminum laminated film made of polyamide for the outermost layer, polyethylene terephthalate resin for the second layer, aluminum foil for the third layer, and high-density polyethylene resin for the innermost layer. is there.

  The adsorbing member 4 includes an adsorbent 5 that adsorbs at least moisture, and a packaging material 6 that covers the adsorbent 5 and does not allow water droplets to pass but allows water vapor to pass.

  The adsorbent 5 is quicklime containing 93% or more of calcium oxide, using a 2 mm mesh, and using a granular material of 2 mm or less selected by this. In other words, the adsorbent 5 enclosed in the packaging material 6 is preferably quick lime, absorbs water vapor released from the core material 3 and water vapor entering from the outside through the jacket material 2, and degrades the vacuum heat insulation panel 1 over time. What keeps low is preferable. Preferably, a calcium oxide component having a content of 93% or more, an initial moisture content of 1.5% or less, and a moisture absorption of 40% or more is used. Moreover, the shape of quicklime is not specifically limited, such as a powder, a fine grain, a granule, a tablet, solid form.

  In this example, quick lime is used as the adsorbent component. However, in order to improve the reliability of the vacuum heat insulating panel, gas adsorption of dosonite, hydrotalcite, metal hydroxide, etc. is performed as necessary. It is also effective to use an agent such as an agent or a barium-lithium alloy.

  The adsorbing member 4 is inserted into the fiber layer of the core material 3 when the vacuum heat insulating panel 1 is manufactured. By this insertion, an external force equivalent to the atmospheric pressure is applied to the jacket material 2 after the manufacture of the vacuum heat insulating panel 1, but the outer shell material 2 is not damaged or broken by the particles of the adsorbing member 4, and the vacuum is applied. The reliability with respect to the heat insulation performance of the heat insulation panel 1 is not impaired.

  As the adhesive 7 for disposing the vacuum heat insulating panel 1 in the outer box 22, the specification A shown in Table 1 having a rosin content of more than 0% and 50% or less is used. In general, the adhesive for fixing the vacuum heat insulation panel to the outer box or the like is a hot melt adhesive, which is a solid adhesive based on a thermoplastic synthetic polymer. In addition to the thermoplastic synthetic polymer, a wax, a tackfire is used. , Plasticizers, fillers and antioxidants. By using an adhesive containing rosin in a proportion of more than 0% and not more than 50% as a tackifier component, the melt viscosity can be maintained appropriately to the extent that workability is improved. It has been found that the adhesion and tackiness with the box 22 can be improved.

  The adhesive 7 is applied to one side of the vacuum heat insulation panel 1 with a thickness of 180 μm or more, and immediately after application, the adhesive 7 is applied to the inside of the outer box 22, and pressed from the upper surface of the vacuum heat insulation panel 1 with a hand roller. The thinner the coating thickness to which the adhesive 7 is applied is, the easier it is to peel off at the interface between the outer box 22 and the adhesive layer 9, and the interface peeling tends to occur. Therefore, the thicker one is preferable, and the thickness is preferably 200 μm or more. Does not cause peeling.

  On the other hand, if the coating thickness is made too thick, cohesive peeling may occur in which the applied adhesive itself peels off. When the adhesive of this example is used, the adhesive is particularly applied with a coating thickness of 180 μm to 300 μm. It is preferable to apply.

  After the vacuum insulation panel 1 produced based on the above specifications and conditions is disposed in the outer box 22 under the application condition of the adhesive 7, the product is left standing in a room temperature (5 to 10 ° C.) for one day and night, After that, it was left standing in a 60 ° C. constant temperature room, and the degree of peeling of the vacuum insulation panel 1 was examined. The results are shown in Table 2. There was no gap, peeling, or dropping until after standing at 60 ° C. in a constant temperature room for 10 hours, and the stuck and fixed state was good.

  Further, the heat insulating box body 21 in which the outer box 22 is applied in advance and bonded and fixed to the vacuum heat insulating panel 1 under the above-described conditions and the foam heat insulating material 24 is injected is the outer box of the vacuum heat insulating panel 1. Since peeling from 22 did not occur, the appearance was good.

Moreover, since the vacuum heat insulation panel 1 is arrange | positioned using the adhesive agent 7 inside the metal outer box 22 of the heat insulation box 21, in the vicinity of this vacuum heat insulation panel 1, high temperature piping, such as a hot gas pipe, is provided. If the adhesive of this example is used even when is disposed, it is possible to provide a highly reliable refrigerator without melting the adhesive. Further, since the necessary adhesive force can be maintained even with temperature changes, the degree of freedom in design can be improved.
(Comparative example)
Various members constituting the vacuum heat insulation panel 1 are the same as those described in the examples. The adhesive 8 for disposing the vacuum heat insulation panel 1 in the outer box 22 uses the specification B shown in Table 1 that does not contain rosin. The coating conditions for the adhesive 8 are the same as those described in the examples.

  The vacuum insulation panel 1 produced based on the same specifications and conditions as in the example was placed in the outer box 22 under the above-described adhesive 8 coating conditions, and then stood in a room temperature (5 to 10 ° C.) for one day and night. And then left standing in a constant temperature room at 60 ° C. to examine how the vacuum insulation panel 1 was peeled off. The results are shown in Table 2. After leaving in a constant temperature room at 60 ° C. for 50 minutes, there was already a gap between the vacuum heat insulation panel 1 and the outer box 22, and after leaving for 10 hours, the vacuum heat insulation panel 1 was peeled off from the outer box 22 and dropped. . In addition, even if there was no gap or peeling after leaving in a constant temperature room at 60 ° C. for 50 minutes, a gap was formed after leaving for 10 hours.

  Actually, the heat insulating box 21 in which the vacuum heat insulating panel 1 is peeled off from the outer box 22 after the outer box 22 and the inner box 23 are assembled, or during the injection of the foam heat insulating material 24 or after the foam heat insulating material 24 is injected. The outer box 22 was distorted and the appearance was poor.

表１は、真空断熱パネルを外箱に配設するための接着剤の成分を示すものである。実施例において用いた接着剤はＡ仕様、比較例において用いた接着剤はＢ仕様である。

Table 1 shows the components of the adhesive for disposing the vacuum heat insulation panel in the outer box. The adhesive used in the examples is A specification, and the adhesive used in the comparative example is B specification.

表２は、真空断熱パネルを接着剤を用いて外箱に配設し、所定の条件で立掛けて放置した後の、真空断熱パネルと外箱の剥れ具合を検討した結果を示すものである。

Table 2 shows the results of examining the degree of peeling between the vacuum heat insulation panel and the outer box after the vacuum heat insulation panel was placed in the outer box using an adhesive, and left standing under predetermined conditions. is there.

It is a perspective schematic diagram of the refrigerator box which arrange | positioned the vacuum heat insulation panel with this invention or the conventional adhesive agent. It is principal part sectional drawing of the refrigerator which arrange | positioned the vacuum heat insulation panel with the adhesive agent used by this invention. It is principal part sectional drawing of the refrigerator which arrange | positioned the vacuum heat insulation panel with the conventional adhesive agent.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Vacuum insulation panel, 2 ... Cover material, 3 ... Core material, 4 ... Adsorption member, 5 ... Adsorbent, 6 ... Packaging material, 7 ... Adhesive used by this invention, 8 ... Adhesion used conventionally Agent, 9 ... adhesive layer, 21 ... heat insulation box, 22 ... outer box, 23 ... inner box, 24 ... foam insulation.

Claims (1)

While disposing a vacuum heat insulation panel between the outer box and the inner box, and filling the foam heat insulating material between the outer box and the inner box, the refrigerator configured the heat insulating material,
The vacuum insulation panel is bonded to the inside of the outer box using an adhesive, and the rosin content of the adhesive is greater than 0% and less than 50%, and the adhesive has a thickness of 180 μm or more on the vacuum insulation panel. A refrigerator characterized by being applied.

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