JPH0243952B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for manufacturing a heat insulating box for a refrigerator or the like and a heat insulating wall used in a prefabricated refrigerator.

Prior Art Figures 1 and 2 show conventional heat insulating walls.
A conventional method of manufacturing a heat insulating wall will be explained below with reference to FIGS. 1 and 2.

1 is a heat insulating material pack, which includes a fine powder such as perlite 2, an air permeable inner bag 3 made of kraft paper, and an outer bag 4 made of an airtight film such as vinylidene chloride.
It becomes more. After the fine powder 2 such as perlite is packaged in the inner bag 3, it is covered with an outer bag 4, and the pressure is reduced to 0.001 mmHg from the opening of the outer bag 4, and the opening is heat welded.

The peripheral edges 8 of the heat insulating material pack 1 are bent toward opposite sides so as not to obstruct the flow of the foamed heat insulating material 7. Then, as shown in FIG. 2, after pasting the heat insulating material pack 1 on one of the wall surfaces 5 between the pair of walls 5 and 6 of the heat insulating box with an adhesive (not shown), Then, the foamed heat insulating material 7 is injected and foamed. In addition, the insulation pack 1 is attached to the wall surface 5.
The purpose of fixing is to temporarily fix the heat insulating material pack 1 to prevent it from shifting from a predetermined position until the foamed heat insulating material 7 is injected.

Problems to be Solved by the Invention However, when the heat insulating material pack 1 is attached to the wall surface 5, the peripheral edge 8 of the heat insulating material pack 1 hits the wall surface 5 and is easily damaged, and when the peripheral edge 8 is folded back, the bent portion 9 has a sharper angle. There were wrinkles and tears occurred at these points, which caused the depressurized state to disappear and the insulation performance to deteriorate.

The present invention solves the above-mentioned conventional problems, and prevents the insulation performance from deteriorating due to the generation of sharp wrinkles when the peripheral edge of the insulation material pack is bent and the damage caused when the insulation material pack is attached to the wall surface. The purpose is to prevent

Means for Solving the Problems In order to achieve this object, the method for manufacturing a heat insulating wall of the present invention includes a pair of heat insulating material packs having a single-sided adhesive tape attached to the outer surface of the bent portion of the peripheral edge to cover the bent portion. It is attached to one side of the wall.

Function: With this configuration, wrinkles that occur at the folded part are prevented by the thickness of the single-sided adhesive tape, or even if wrinkles occur, the single-sided adhesive tape reinforces the folded part, so that the outer bag of the insulation pack can be prevented from being torn. Furthermore, when attaching the insulation pack to one of a pair of walls, even if the bent part of the insulation pack hits the wall, the elasticity of the single-sided adhesive tape absorbs the impact, preventing the bent part from tearing. can.

Embodiment The structure of an embodiment of the method for manufacturing a heat insulating wall of the present invention will be described below with reference to FIGS. 3 to 5.

Note that the same parts as in the conventional example are designated by the same numbers and detailed explanation thereof will be omitted.

In the figure, reference numeral 10 is a single-sided adhesive tape such as polyester tape, which has elasticity. This single-sided adhesive tape 10 is pasted in advance at a location corresponding to the folded portion 9 of the outer bag 4, so that the single-sided adhesive tape 10 is placed on the outside when folded. A heat insulating material pack 1 is attached to a wall surface 5, and a foamed heat insulating material 7 is filled between the pair of walls 5 and 6.

Therefore, since the single-sided adhesive tape 10 is pasted on the outer surface of the folded part 9 of the heat insulating material pack 1, the elasticity and thickness of the single-sided adhesive tape 10 prevents the impact of the folded part 9 even when it hits the wall 5. is absorbed and the occurrence of tearing in the folded portion 9 can be prevented. or,
The sharp wrinkles that occur in the folded portion 9 are eliminated by the thickness of the single-sided adhesive tape 10, and the occurrence of tearing can be prevented. Therefore, it is possible to prevent defects such as a decrease in heat insulation performance caused by destruction of the reduced pressure state due to a tear at this location.

In the example, the single-sided adhesive tape was pasted on the outer bag in advance, but even if the single-sided adhesive tape is pasted to cover the folded part after the outer bag is folded, wrinkles will not occur on the folded part. The outer bag is difficult to tear because it is protected with one-sided adhesive tape.

Effects of the Invention As described above, in the present invention, when attaching a heat insulating material pack to a wall, a single-sided adhesive tape is attached to the bent portion of the periphery, so even if the heat insulating material pack hits the wall, it can be prevented from tearing. Since there are no sharp wrinkles that occur when the peripheral edge of the material pack is bent, it is possible to prevent the bending portion from breaking. Therefore, problems such as deterioration in insulation performance caused by destruction of the reduced pressure state due to rupture at this location are eliminated.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a conventional heat insulating material pack, Fig. 2 is a cutaway sectional view of a main part of an insulating wall for a refrigerator using the insulating material pack shown in Fig. 1, and Fig. 3 is a sectional view of an embodiment of the present invention. A cross-sectional view of the heat insulating material pack shown in Fig. 3 is shown in Fig. 3.
FIG. 5 is an enlarged view of the main part of the figure, and FIG. 5 is a cutaway sectional view of the main part of a heat insulating wall for a refrigerator using the heat insulating material pack shown in FIG. 3. 2... Fine powder, 3... Inner bag, 4... Outer bag, 5, 6...
Wall, 8... Peripheral portion, 9... Bent portion, 10... Single-sided adhesive tape.

Claims (1)

[Claims] 1 Filled with fine powder and sealed under reduced pressure, covering the outer surface of the bent portion of the peripheral edge, and pasting an insulating material pack with elastic single-sided adhesive tape on one of the pair of walls. , a method for manufacturing a heat insulating wall in which a foamed heat insulating material is filled between the pair of walls.