JPS60165484A - Manufacture of heat-insulator pack - 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 method for manufacturing a heat insulator pack used for heat insulating boxes for refrigerators, freezers, showcases and the like.

Structure of the conventional example and its problems Figures 1 and 2 show a conventional heat insulator pack.
2 is a heat insulating pack, 2 is a breathable inner bag, and 3 is a powder such as foamed perlite filled in the inner bag 2. 4
is an outer bag made of plastic laminated film.
After inserting the inner bag 2 filled with the powder 3 into the outer bag 4 and reducing the pressure inside to 0.01 Torr, the opening surface 5 of the outer bag 3 is
are sealed by heat welding. 7 is a heat insulating wall of a heat insulating box such as a refrigerator, and the heat insulator pack 1 is attached to an inner box 8 and an outer box 9 of the refrigerator, etc.
It is disposed in between and in contact with the outer box 9, and is formed by integrally foaming a hard urethane foam 1o.

Note that the heat insulating pack 1 is bonded to the outer box 9 with an adhesive 11.

In manufacturing such a heat insulator pack 1, due to the non-uniform packing density of the powder 3 in the heat insulator bag 1, the parts with weak compressive strength are submerged by the compressive force due to atmospheric pressure, and the surface becomes uneven and flat. It was difficult to obtain degrees. As a result,
Even if the insulation pack 1 is bonded to the outer box 9 with the adhesive 11, spaces 12 are formed in spots, and the appearance of the insulation box 7 facing the spaces 12 becomes wavy, which is an important problem in terms of quality. there were.

Object of the Invention Structure of the Invention In order to achieve the above object, the present invention is such that a flat plate made of cardboard or the like is disposed between an inner bag and an outer bag. Even if the heat insulating pack is bonded to the outer box of the heat insulating box, there is no space between the outer box and the heat insulating pack, which contributes to the quality of the appearance of the heat insulating box.

DESCRIPTION OF THE EMBODIMENTS The configuration of one embodiment of the present invention will be explained below with reference to FIGS. 3 to 6.
The explanation will be made with reference to the drawings, and the same components as those of the above-mentioned conventional example will be denoted by the same reference numerals and detailed explanation thereof will be omitted.

In the figure, 14 is made of porous cardboard, etc. with a thickness of 0.5
After the inner bag 2 filled with the powder 3 is flattened into a flat plate of about 2.0 W, it is fixed to the outer surface of the inner bag 2 with a tape 16 coated with an adhesive such as polyester tape. After this,
The inner bag 2 with the flat plate 14 is heated to 120 to 160°C,
Volatile gas such as moisture in the powder 3, inner bag 2, and flat plate 14 is evaporated. Next, 11 people are placed in the external bag 4, the pressure is reduced, and the opening 1a is heat welded to form the heat insulator pack 1'.

By arranging the flat plate 14 made of cardboard or the like between the inner bag 2 and the outer bag 3 in this way, the compressive force of atmospheric pressure is applied to the entire flat plate 14 via the outer bag 3. Therefore, even if the powder 3 has a different packing density and its compressive strength is uneven, at least the outer bag 3 will not be dented by the powder 3 through the flat plate 14.

Therefore, even if this heat insulator pack 1' is adhered to the outer box 9 of the heat insulating box body 7, no space 13 is formed between the outer boxes 9, and they are fixed in close contact. As a result, there are no problems such as the appearance of the heat insulating box 7 with waving, which contributes to improved quality. In addition, since the flat plate 14 is sufficiently heated to volatilize the contained gas such as moisture, the insulation performance of the heat insulator pack 1 does not deteriorate over time, and porous cardboard is used as the flat plate 14. Therefore, the cardboard itself has good heat insulation properties when the pressure is reduced, and there is no effect such as deterioration of the heat insulation performance of the heat insulator pack 1', and excellent heat insulation performance can be maintained. Furthermore, flat plate 1
4 is fixed to the inner bag 2 with a tape 16 made of polyester or the like, so that it can be handled as one piece during work, and has excellent workability.

Effects of the Invention The present invention has the above-described configuration, and provides the following effects.

(-) Because a flat plate such as cardboard is placed between the inner bag and outer bag,
Unevenness on the surface of the heat insulating pack under atmospheric pressure due to local non-uniformity in the packing density of the powder is prevented, and a highly flat surface is obtained. Therefore, even if it is adhered to the outer case of the heat insulating box, it can be adhered tightly and no space is formed. Therefore, the appearance of the insulation box is free from deformation such as waving.
A heat insulating box with excellent quality 1 can be obtained.

(b) Since the flat plate is used after being sufficiently heated to volatilize the internal gas, there is no deterioration in insulation performance due to deterioration of the degree of vacuum due to gas generation from the flat plate over time.

(C) Since the flat plate is fixed to the υ inner bag with a tape made of polyester or the like, it can be handled as one piece during work and has excellent workability.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a conventional heat insulating pack, Fig. 2 is a sectional view of a heat insulating wall of a heat insulating box using the same heat insulating pack, and Fig. 3 is a cross sectional view of a heat insulating pack in an embodiment of the present invention. Figure, 4th
The figure is an enlarged sectional view of the main part of part A in Figure 3, and Figure 6 is the same heat insulator.
FIG. 3 is a sectional view of a heat insulating wall of a heat insulating box using a hook. 2... Inner bag, 3... Powder such as foamed perlite, 4... Outer bag, 14... Flat plate,
16...Tape O Agent's name Patent attorney Medium
Toshio Oo and 1 other person Figure 1 Figure 2 Figure 3 (3) 511!1

Claims (1)

[Claims] An outer bag made of plastic laminated film, etc.
It is equipped with a breathable inner bag, a flat plate made of cardboard or the like, and a powder such as foamed perlite filled in the inner bag, and after filling and sealing the powder into the inner bag, the flat plate is wrapped with a tape made of polyester or the like. A method for manufacturing a heat insulator pack, which is fixed to an inner bag, heated and dried, inserted into the outer bag, and then heat-welded to the opening surface of the outer bag while reducing the pressure.