JPS60165485A - Heat-insulating box body - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a heat insulating box for refrigerators, freezers, showcases and the like.

Structure of the conventional example and its problems FIGS. 1 to 6 show a conventional heat insulating box. The configuration of this conventional example will be explained below with reference to FIGS. 1 to 6.

In the figure, 1 is a heat insulating box body, an inner box 2, an outer box 3, a heat insulating pack case 6 fixed to the outer box 3 with an adhesive 4, and a hard material formed integrally between both boxes 2 and 3. It is made of urethane foam 6. The heat insulating material bag 5 is made by filling and sealing a breathable inner bag 8 with a powder 7 such as foamed perlite, and then inserting it into an outer bag 9 made of metal foil-plastic laminate film that has been sealed on three sides in advance. It was heat-sealed while vacuum degassing from 10 to internal pressure of 0.01 Torr, and the thermal conductivity was 0.0141all/mh℃ compared to that of hard urethane foam 6.
,0071 ad/mh °C, which shows high thermal insulation properties. In addition, the material composition of the outer bag 9 of the metal foil-plastic laminate film is such that the upper layer 11 has a thickness of 10 to 20 μm.
using polyester film or polypropylene film.

Middle layer 12 is 9~15μ aluminum foil, lower layer 13 is 60~10μ
Even if a 0μ polyethylene film is used, the width of the peripheral edge 14 of the heat-insulating pack 6 is 10 to 16 mm, including the seal width of the heat-sealed part 16, but the opening 1
Only the peripheral edge 14 has a length of 30 to asmm.

Next, the operation of the above conventional example will be explained. In such a heat insulating box 1, when the hard urethane foam 6 is integrally foamed, the peripheral edge 14 of the heat insulating material pack 6 may be placed in contact with the outer box 3 due to the flow of the hard urethane foam 6. there were. As a result, the originally hard urethane foam 6
Even with the heat insulating material bag 5 having the thermal conductivity of a bar, a new heat flow is generated that transfers heat from the outer box via the peripheral edge 14.

In particular, A of 9 to 1611 to maintain vacuum barrier properties.
Since the middle layer 12 of ρ foil is used, the influence of heat flow is large. Furthermore, the peripheral edge 14 is made of hard urethane foam 6.
As a result, voids are generated in the vicinity of the periphery 14, causing problems such as overall insulation and local dew formation.

Therefore, attempts have been made to make the circumferential edge 14 shorter, but the distance between the inner bag 8 and the heat-sealed part 16 cannot be made shorter, especially for the circumferential edge 14 of the opening 10, in order to prevent the heat-sealed part 16 from wrinkling. I couldn't do it.

OBJECTS OF THE INVENTION The present invention eliminates the drawbacks of the above-mentioned conventional examples, and aims to improve quality stability without changing the insulation performance of the insulation box depending on manufacturing conditions.

Structure of the Invention In order to achieve the above object, the present invention disposes a spacer made of a heat insulating material such as hard urethane 7 ohm between the periphery of the insulation puncture and the outer box where the periphery is located, and
Attach the insulation bag to the outer box surrounded by the spacer,
The periphery is placed on a spacer and foamed in one piece, so no matter how the rigid urethane foam flows,
The periphery does not touch the outer box, and no voids are generated.

DESCRIPTION OF THE EMBODIMENTS The structure of an embodiment of the present invention will be described below with reference to FIGS. 6 to 8. Structures that are the same as those of the prior art will be given the same reference numerals and detailed explanations thereof will be omitted.

In FIG. 2, a spacer 16 is made of a heat insulating material such as hard urethane foam, and is fixed to the outer box 3 with an adhesive 4 such as hot melt applied to the outer box 3. The spacer 16 is located where the peripheral edge 14 of the heat insulating material bag 6 is located. After this, the ≠ radial heat insulating material bag 6 is inserted into the portion on the outer box a surrounded by the spacer 16 and pasted. The surface of the spacer 16 in contact with the heat insulating bag 6 has the same shape as the opposing heat insulating bag 6, and the thickness of the spacer 16 is equal to the height h of the periphery 14. Further, an adhesive 18 is applied in advance to the upper side 17 of the spacer 16 on which the peripheral edge 14 is arranged. Then, the peripheral edge 14 is fixed to the upper side 17.

Next, the operation of the above embodiment will be explained. When the hard urethane foam 6 is injected between the inner box 2 and the outer box 3 in a container as shown in the figure, the periphery 14 is fixed on the spacer 16 and isolated from the outer box 3 no matter how much it flows. Therefore, the peripheral edge 14 does not come into contact with the outer box 3. Further, the shape of the surface of the spacer 16 in contact with the heat insulating pack 6 is the same as that of the opposing heat insulating bag 6, so that there is no gap between the spacer 16 and the heat insulating pack 6, and the peripheral edge 14 is aligned with the upper side 17 of the spacer 16. Since it is fixed by the adhesive 18, the peripheral edge 14 will not bend due to the flow of the hard urethane foam 6, and will not significantly reduce fluidity or create voids in this area.

Therefore, the periphery 14 does not come into contact with the outer box 3 and generate new heat flow, and voids are not generated near the periphery 14, and the insulation properties of the heat insulating box 1 are stable during mass production without variations depending on manufacturing conditions. It has excellent heat insulation properties.

Further, the spacer 16 is made of a heat insulating material, so that it does not reduce the heat insulating property, and by placing the spacer 16 in advance in the outer box 3 where the peripheral edge 14 is located, the spacer 16 is made of a heat insulating material. This has the advantage that positioning during installation is easy.

Effects of the Invention The present invention has the above-described configuration, and by arranging the periphery of the heat insulating material pack so as to be separated from the outer box by a spacer, no matter how the rigid urethane foam flows, it will come into contact with the outer box. The new heat flow from the outer box will not deteriorate the insulation properties of the insulating box. Further, when the spacer is formed of a heat insulating material, the spacer does not deteriorate the heat insulating property.

Furthermore, if a spacer is placed in advance at a location where the periphery of the heat insulating material pack is located, positioning of the heat insulating material pack becomes easy.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of an insulation box using a conventional insulation pack, Figure 2 is a cross-section of the insulation pack when the inner bag is inserted into the outer bag, and Figure 3 is a cross-sectional view of the insulation box using a conventional insulation pack. 4 is an enlarged sectional view of the outer bag, and FIG. 6 is a cross-sectional view of the insulation box using the insulation pack according to an embodiment of the present invention. Figure 6 shows the insulation pack when the inner bag is inserted into the outer bag, and Figure 7 is a cross-sectional view of the insulation pack after degassing and heat welding of the opening surface of the outer bag are completed.
FIG. 8 is an enlarged sectional view of the outer bag. 3...Outer box, 5...Insulation pack, 6
・・・・・・Hard urethane foam%16・・・・・・
spacer. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
11! 21st! l No. 31jll No. 41! l! J 6 Figure 7

Claims (3)

[Claims] (1) Consisting of an inner box, an outer box, an insulating bag fixed to the outer box with adhesive, and a hard urethane foam filled between the two boxes, and between the periphery of the insulating puncture and the outer box. An insulated box with a spacer. (2) The heat insulating box according to claim 1, wherein the spacer is in close contact with the periphery of the heat insulating bag. (3) The heat insulating box according to claim 1, wherein the spacer is formed of a heat insulating material.