JPS60240981A - Decompression heat-insulating material and manufacture thereof - 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 reduced pressure heat insulating material used for heat insulating boxes of refrigerators, freezers, frozen showcases, etc.

Configuration of conventional example and its problems 2 /\-/ Figures 1 and 2 show a conventional vacuum insulation material, and the configuration of this conventional example will be described below.

In the figure, 1 is a vacuum insulation material, 2 is a breathable inner bag, and 3 is a powder such as perlite.

Reference numeral 4 denotes an outer bag made of a laminated film such as metal-plastic. After inserting the inner bag 2 filled with the powder 3 into the outer bag 4 and reducing the pressure inside to 1 Torr or less, the outer bag 4 is opened. The parts are sealed by heat fusion. Reference numeral 6 is a peripheral edge of the reduced-pressure heat insulating material 1, and the outer bag 4 is formed in close contact with the outer bag 4. Reference numeral 7 is a heat insulating box body for a refrigerator or the like, and a vacuum heat insulating material 1 is placed between a synthetic resin inner box 8 and a metal outer box 9 in contact with the outer box 9, and a hard urethane foam 10 is further formed by integrally foaming. ing.

In manufacturing such a vacuum insulation material 1, when inserting the powder 3 into the inner bag 2 into the outer bag 4 after filling it into the inner bag 2 so as to form a flat plate, the outer bag 4 must be made significantly larger than the inner bag 3. It was difficult to insert it into the outer bag 4 easily.

However, making the outer bag 4 sufficiently larger than the inner bag 2 means that the periphery 6 becomes long, and when the hard urethane foam 10 is integrally foamed, the flow of the foam may be obstructed, or air may be trapped between the outer box 9 and the periphery 6. void 1 by forming a stop.
0a and cavity 1ob (FIG. 2) are generated, which causes a problem of deteriorating the heat insulating properties of the heat insulating box 7.

OBJECTS OF THE INVENTION The present invention eliminates the drawbacks of the above-mentioned conventional examples, and aims not only to simplify the manufacturing process but also to eliminate factors that impede heat insulation performance.

Structure of the Invention In order to achieve the above-mentioned object, the present invention provides that after directly filling an outer bag with powder, a breathable lid is inserted into the outer bag, and the lower end of the lid is heat-fused to the outer bag at a predetermined position. After the outer bag is attached and air is evacuated through the lid, the opening of the outer bag is sealed by heat sealing.

This allows the powder to be filled into the outer bag in a short time, and after the lid is heat-sealed to the outer bag, the powder will not leak out at all, and the powder will scatter during degassing and the vacuum will be removed. There is no possibility of powder being sucked into the pump and deteriorating the performance of the vacuum pump.

Further, since powder does not adhere to the inner surface of the opening of the outer bag, the heat-sealed portion at the periphery of the outer bag has good fusing performance. There is no need to use a larger outer bag, and the width of the periphery can be shortened. Furthermore, since the powder is filled to every corner of the outer bag, wrinkles that may cause pinholes etc. do not occur near the periphery of the outer bag.

DESCRIPTION OF EMBODIMENTS The configuration of an embodiment of the present invention will be explained below with reference to FIGS. 3 to 8.
The explanation will be made with reference to the drawings, but the same parts as in the above conventional example will be given the same numbers and detailed explanation thereof will be omitted.

In the figure, 11 is a discharge port of a powder filling machine, and the powder is directly filled into the outer bag 4 (FIG. 3). Reference numeral 12 denotes a bag-shaped lid made of breathable paper, non-woven fabric, etc., and has an outside width that is the same as the inside width of the outer bag 4 (FIG. 4). This lid 120
Insert it into the outer bag 4 filled with the powder 3 with the bag-shaped opening 13 facing down (Fig. 5), and heat-seal and join using the heat-sealing machine 14 at a predetermined position (Fig. 5). Figure 6). At this time, the lid 12 and the outer bag 4 are firmly heat-fused, but the lid 1
The inside of No. 2 is not fused. After that, when the outer bag 4 filled with the powder 3 is flattened, the powder 3 is packed into the outer bag 4 and
Every corner of the inside of the lid 12 is filled with shavings (FIG. 7).

Next, the inside of the outer bag 4 is exposed through this breathable lid 12.
Then, the opening 6 of the outer bag 4 is heat-sealed to form a joint 1'' to form a reduced-pressure heat insulating material 1'.

In this embodiment, the powder 3 is directly transferred to the outer bag 4 as described above.
Since the inner bag is filled, the work can be done more easily and in a shorter time than with the conventional inner bag without damaging the outer bag. In addition, since the powder is filled to every corner inside the outer bag 4 and the lid 12, the periphery of the outer bag 4 becomes only the heat-sealed part, which can be shortened, and wrinkles do not occur near the periphery of the outer bag 4. There is an advantage that it disappears.

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

Body) Since the powder is directly filled into the outer bag, it is easier to work in a shorter time and without causing damage to the outer bag than when using an inner bag.

(b) There is no need to use a larger outer bag than in the past, and the powder can be filled to every corner inside the outer bag and lid, so the outer bag can be shortened with only the heat-sealed periphery. For this reason, for example, when a vacuum insulation material is placed in contact with the outer box of an insulating box and is integrally foamed with hard urethane foam, it may obstruct the flow of the hard urethane foam or form air pockets between the outer box and the periphery. This will not cause voids or cavities.

(C) Since the lid is breathable, there is no problem with degassing.

(d) The lid completely seals the inside of the opening of the outer bag, so powder often leaks. Therefore, powder is not sucked into the vacuum pump and the performance of the vacuum pump is not deteriorated. Further, since the powder does not adhere to the inner surface of the opening of the outer bag, the heat sealability of the periphery of the opening of the outer bag is improved.

(e) Since the entire surface of the outer bag, excluding the joints, becomes an effective area for insulation, a wider insulation area can be obtained compared to the conventional insulation material with a long periphery using an inner bag. When installed, a heat insulating box with better heat insulating performance than conventional ones can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a partial sectional view of a conventional reduced pressure insulation material, Fig. 2 is a sectional view of a main part of a heat insulating box using the same reduced pressure insulation material, and Figs. 3 to 8 are reduced pressure in an embodiment of the present invention. The manufacturing process of the insulation material is illustrated. Figure 3 is a cross-sectional view of the reduced pressure insulation material being filled with powder, Figure 4 is a perspective view of the lid, and Figure 5 is a diagram of the vacuum insulation material being filled with powder.
Figure 6 is a sectional view of the vacuum insulation material with the lid inserted into the outer bag; Figure 6 is a sectional view of the vacuum insulation material with the lid and the inside of the outer bag heat-sealed; Figure 7
The figure is a cross-sectional view of the reduced-pressure heat insulating material laid out on a flat plate after the lid is fused to the inside of the outer bag, and FIG. 8 is a cross-sectional view of the reduced-pressure heat-insulating material. 4...Outer bag, 3...Powder, 12...
...Lid, 5...Opening. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 /θ4 Ku 8 Sunhiro Gen 6 Figure 1? Figure 8 Figure 7

Claims (2)

[Claims] (1) An outer bag with an open side, a powder filled into the outer bag through the opening, and a breathable lid provided on the opening side to vent air when the inside of the outer bag is depressurized. ,
A reduced-pressure heat insulating material comprising an adhesive portion provided on the opening side of the lid. (2) - Put the powder in an outer bag with an open side, then place a breathable lid in the opening and join the lid and the outer bag,
After that, the pressure inside the outer bag is reduced through the opening of the outer bag, and after the pressure is reduced, the opening is joined.