JP2728318B2 - Manufacturing method of vacuum insulation box - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum insulation box used for, for example, a refrigerator or a freezer, and more particularly to a method for manufacturing such a vacuum insulation box.

[0002]

2. Description of the Related Art Generally, for example, in a refrigerator or a freezer,
Insulation between the inside and the outside of the refrigerator is an important factor for improving the refrigeration capacity and the freezing capacity. Therefore, in order to improve the heat insulating performance of a refrigerator or the like, one surface 3a of the vacuum heat insulating panels 3,..., 3 is bonded to the inner surface 1a of the outer box 1 as shown in FIGS. Are assembled in the inner box 2, and the vacuum heat insulating panels 3,..., 3 are arranged in the space between the inner surface 1 a of the outer box 1 and the outer surface 2 a of the inner box 2. Thereafter, a foamed heat insulating material (for example, hard urethane foam) 4 is injected into a space between the inner surface 1a of the outer box 1 and the outer surface 2a of the inner box 2.

[0003]

However, a gap g is provided between the other surface 3b of the vacuum insulation panel 3 and the outer surface 2a of the inner box 2, and since the gap g is narrow, the foam insulation 4 Since the flow of the gas becomes worse, the injection operation is difficult. Further, since the thermal conductivity of the vacuum heat insulating panel 3 is much lower than that of the foam heat insulating material 4, the foam heat insulating material 4 injected into the gap g does not significantly contribute to the improvement of the heat insulating performance. Conversely, there is a problem that the space (heat insulating layer) between the inner surface 1a of the outer box 1 and the outer surface 2a of the inner box 2 becomes thicker, and the volume of the inner box becomes smaller.

Accordingly, an object of the present invention is to increase the volume of the heat insulating box and improve the workability of assembling.

[0005]

SUMMARY OF THE INVENTION To achieve the above object, the present invention provides a vacuum insulation panel disposed in a space between an inner surface of an outer box and an outer surface of the inner box. A method for manufacturing a vacuum insulating box body in which an inner surface of the outer box is bonded, wherein one surface of a vacuum insulating panel is bonded to each of inner surfaces of a plurality of independent parts constituting at least a part of the outer box. And separately applying a two-component main-agent-type adhesive, which starts curing when contacted, to the other surface of each of the vacuum insulation panels and the outer surface of the inner box, and to the inner surface of a plurality of portions of the outer box. Bonding the other surface of each of the bonded vacuum insulation panels to the outer surface of the inner box with the two-component main agent type adhesive.

[0006]

One side of each vacuum insulation panel, which is slightly thicker than before and has improved heat insulation performance, is bonded to the inner surface of each of the plurality of independent portions of the outer box, and the other surface is bonded to the outer surface of the inner box. As a result, there is no gap between the other surface of the vacuum insulation panel and the outer surface of the inner box, so that it is not necessary to inject the foamed heat insulating material into this gap, and the injection operation is facilitated. Also,
Since the outer surface of the inner box is adhered to the other surface of the vacuum insulation panel, each surface of the inner box after foaming of the foamed heat insulating material has no rattling or unevenness (stickiness), and the commercial value is improved. Furthermore, the vacuum insulation panel only needs to improve the heat insulation performance equivalent to the conventional foam insulation material in the gap, so that it is only slightly thicker. Space can be reduced, and the volume of the inner box increases accordingly.
In addition, the other side of the vacuum insulation panel and the outer surface of the inner box
Since the liquid main agent type adhesive is separately applied, it is possible to apply the adhesive, so that the adhesive workability is improved, and the position of the inner box and the vacuum insulation panel can be corrected after the contact.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments.

As shown in FIGS. 1 and 2, a heat insulating box such as a refrigerator has an outer box 10 and an inner box 11. A space is provided between the inner surface 10a of the outer box 10 and the outer surface 11a of the inner box 11, and vacuum insulation panels 13 are arranged at the upper, rear, and both sides of the space. Each of the vacuum insulation panels 13 is formed, for example, by filling a spacer material made of an inorganic powder having a low thermal conductivity into an inner bag having good air permeability, such as kraft paper, and then holding the spacer material together with the inner bag in a vacuum holding property. It is a well-known thing which was constituted by vacuum-sealing with a good outer packaging material.

The thickness t of the vacuum insulation panel 13 is shown in FIG.
Is slightly thicker than the thickness t1 of the conventional vacuum heat insulating panel 3. That is, conventionally, the other surface 3b of the vacuum insulation panel 3
A gap g is provided between the inner box 2 and the outer surface 2a of the inner box 2, and the foamed heat insulating material 4 is injected into the gap g. In the present invention, since the gap g and the foamed heat insulating material in the gap g are eliminated, the thickness t of the vacuum insulation panel 13 is made slightly larger than the conventional thickness t1 in order to maintain the heat insulation performance. However, since the thermal conductivity of the vacuum heat insulating panel 13 is much lower than that of the foam heat insulating material 4, the increase in the thickness t may be very small.

One surface 13a of the vacuum insulation panel 13 is
The other surface 13b is bonded to the outer surface 11a of the inner box 11 while the other surface 13b is bonded to the inner surface 10a of the outer box 10. As shown in FIG. 3, the bonding order is such that one surface 13 a of the vacuum heat insulating panel 13 is bonded to the inner surface 10 a of the outer box 10 in advance with a double-sided adhesive tape or the like, and then the vacuum insulating panel 13 is bonded to the outer surface 11 a of the inner box 11. The other surface 13b of the panel 13 is bonded. This vacuum insulation panel 13
When the double-sided adhesive tape is used for bonding, it is impossible to correct the position of the inner box 11 and the vacuum insulation panel 13 after the bonding. In addition, when a room-temperature-curable adhesive is used, the usable time from application to bonding is limited, and application is not performed, so that the bonding workability is deteriorated.

Therefore, a two-component main agent type adhesive (for example, Konishi Bond AG300) having two types of modified acrylic as main components is separately applied to the other surface 13b of the vacuum heat insulating panel 13 and the outer surface 11a of the inner box 11. I do. This adhesive is
It has the property that curing starts when two separately applied liquids come into contact.

After the vacuum heat insulating panel 13 is bonded into the space between the outer case 10 and the inner case 11 and assembled, a foam heat insulating material 14 is injected into the space without the vacuum heat insulating panel 13.

According to the above configuration, one surface 13a of the vacuum heat insulating panel 13 is bonded to the inner surface 10a of the outer case 10 and the other surface 13b is bonded to the outer surface 11a of the inner case 11.
Since there is no gap g between the other surface 13b of the third box 13 and the outer surface 11a of the inner box 11 as in the prior art, there is no need to inject the foamed heat insulating material 14 into the gap g. Therefore, the work of injecting the foam insulation 14 becomes easy.

Further, since the outer surface 11a of the inner box 11 is adhered to the other surface 13b of the vacuum heat insulating panel 13, each surface of the inner box 11 after foaming of the foamed heat insulating material has no backlash and no irregularities.
Product value is improved.

Further, since the vacuum heat insulating panel 13 only needs to improve the heat insulating performance corresponding to the conventional foam heat insulating material injected into the gap g, it need only be slightly thicker than the conventional one, and the gap g is unnecessary. Therefore, the space between the outer box 10 and the inner box 11 can be reduced, and the volume of the inner box 11 can be increased accordingly.

Further, the other surface 1 of the vacuum insulation panel 13
3b and the outer surface 11a of the inner box 11 are separately coated with a two-component main agent type adhesive to separate the other surface 1 of the vacuum heat insulating panel 13
An adhesive can be applied to the outer surface 3a of the inner box 11 and the outer surface 3b of the inner box 11 to improve the bonding workability. In addition, since the curing starts when the two types of adhesives come into contact with each other, the inner box 11 can be made even after the contact.
And the position of the vacuum insulation panel 13 can be corrected.

[0017]

As is apparent from the above description, according to the method for manufacturing a vacuum heat insulating box of the present invention, one surface of each vacuum heat insulating panel is bonded to the inner surface of a plurality of independent parts of the outer box. By bonding the other surface to the outer surface of the inner box, there is no gap between the other surface of the vacuum insulation panel and the outer surface of the inner box.Therefore, there is no need to inject foam insulation into this gap.
Injection work becomes easier. Further, since the outer surface of the inner box is adhered to the other surface of each of the above vacuum insulation panels, it is possible to prevent rattling and unevenness of each surface of the inner box after the foam insulation material is foamed, thereby improving the commercial value. Furthermore, the vacuum insulation panel only needs to be slightly thicker than before in order to improve the heat insulation performance corresponding to the foam insulation material in the above-mentioned gap, and since no gap is required, the space between the outer box and the inner box is not required. The space can be reduced, and the capacity of the inner box can be increased accordingly. Furthermore, since the two-component main adhesive is separately applied to the other surface of the vacuum insulation panel and the outer surface of the inner box, the adhesive can be applied and the workability of the adhesion can be improved. The position between the plurality of portions of the outer box can be corrected at the same time as the position is corrected.

[Brief description of the drawings]

FIG. 1 is a cross-sectional plan view of a vacuum insulated box manufactured by a method according to the present invention.

FIG. 2 is a front sectional view of the vacuum insulated box of FIG. 1;

FIG. 3 is an exploded front sectional view of the vacuum insulated box of FIG. 1;

FIG. 4 is a cross-sectional plan view of a conventional vacuum insulation box.

FIG. 5 is a front sectional view of the vacuum insulated box shown in FIG. 5;

[Explanation of symbols]

Reference numeral 10: outer box, 10a: inner surface, 11: inner box, 11a: outer surface, 13: vacuum insulation panel, 13a: one surface, 13b: other surface.

Claims (1)

(57) [Claims] 1. A method of manufacturing a vacuum heat insulating box in which a vacuum heat insulating panel is disposed in a space between an inner surface of an outer case and an outer surface of the inner case, and one surface of the vacuum heat insulating panel is bonded to the inner surface of the outer case. A step of adhering one surface of a vacuum heat insulating panel to each of inner surfaces of a plurality of mutually independent parts constituting at least a part of the outer box; Separately applying the other surface of each of the vacuum insulation panels to the outer surface of the inner box; and attaching the other surface of each of the vacuum insulation panels adhered to the inner surface of a plurality of portions of the outer box to the second surface. With liquid base type adhesive,
Adhering to the outer surface of the inner box.