JPS60256699A - Heat-insulating 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 heat insulating pack used as a heat insulating material for a heat insulating box used for refrigeration or heat preservation.

Conventional structure and its problems FIG. 3 shows an existing heat insulation pack. The configuration of this conventional example will be explained below with reference to FIG.

In the figure, 1 is a fine powder obtained by crushing porous rock, and this fine powder 1 is stored in a breathable inner bag 2.

The inner bag 2 is made of paper or the like, and is of good quality for storing the fine powder 1 and having good air permeability.

3 is an outer bag, which is a film made of airtight plastic-Kinko, and is a laminated film made of multiple types of materials in order to be made of a non-moisture-permeable material.

And outer bag 3. Nakabukuro 2. A heat insulation pack 4 is formed from the fine powder 1. A method of manufacturing a heat insulating pack having such a structure will be explained with reference to FIG. 4.

The fine powder 1 is porous stone powder with a weight of 4 to 5 lt. This fine powder 1 is stored in an inner bag 2, and the four sides are sealed so that the fine powder 1 does not come out on the outer periphery of the inner bag 2. Next, three sides of the outer bag 3 are heat-sealed in advance, and the inner bag 2 containing the fine powder 1 is stored inside the outer bag 3, and the inside is evacuated.

For vacuuming, as shown in FIG. 2, the inner bag 2 containing the fine powder 1 is placed in the vacuum jig furnace 6, and the heat insulating pack 4 covered with the outer bag 3 is left alone. Then, the internal pressure of the evacuation jig furnace 5 is reduced to a vacuum (0, ○1 to 0
．． 03 Torr), the internal pressure inside the heat insulating bag 4 is also reduced to vacuum. Then, in a vacuum state, the outer bag 3 is manufactured by applying pressure and melting with a heat generating heater 8 and thermally welding one side of the outer bag 3.

However, in the existing example, the larger the insulation pack becomes, the longer it takes to vacuum the pack. In addition, the opening (A) of the outer bag 3 is strongly vacuumed, and the opening (A)
The degree of vacuum will be high, but the degree of vacuum will be low at the part farther away (B) from the opening on the opposite side (A). This causes a phenomenon of shading in the density of the fine powder 1 to be incorporated. As a result, if left exposed to atmospheric pressure, the heat insulating pack 4 will deform, resulting in a bowing phenomenon. Unfortunately, the phenomenon that evacuation takes time is one of the reasons why the time increases inversely as the density on the open side (A) increases, as described above. To solve this drawback, the time can be shortened by providing multiple openings (a) (both sides are unsealed), but the device for thermally welding the outer bag 3 to the vacuum furnace '5 is Not only are a plurality of units required, which increases the cost, but also a hermetically sealed structure for attaching the heat welding device attached to the vacuum evacuation furnace 6 is required, which increases the number of factors that reduce the ability to perform evacuation.

OBJECTS OF THE INVENTION The present invention is intended to eliminate the drawbacks of the above-mentioned conventional examples, and aims to shorten the evacuation time, prevent deformation of insulation punctures, and increase the average density of fine powder.

Structure of the Invention In order to achieve the above object, the present invention is characterized in that an inner bag containing fine powder and a pipe made of a soft material having a large number of small diameter holes are installed on both sides of the inner bag.

DESCRIPTION OF EMBODIMENTS The configuration of an embodiment of the present invention will be explained below with reference to FIGS. 1 and 2.
The explanation will be made with reference to the drawings, but the same configurations as the conventional ones will be given the same numbers and detailed explanations will be omitted.

In the figure, 11 is placed on both sides of the inner bag 3. ・1
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A pipe 11 made of a fatty material is formed to have the same length as the inner bag 2. In this state, the inner bag 3 and the pipe 11 are inserted into the outer bag 1 through the opening (A) of the outer bag 3, and a vacuum is drawn to form the heat insulation pack 2. During this evacuation, the air in the fine powder 1 is guided through the small diameter hole 1o, through the inner diameter 11a of the pipe 11, and into the opening (A).

Therefore, the small diameter hole 10 and the inner diameter portion 11 of the pipe 11
Air can be easily and completely exhausted from each passage a. Also,
Since the fine powder 1 can be evacuated evenly, the evacuating time can be shortened and deformation can be prevented.

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

In other words, due to the small diameter holes provided on the inner diameter and outer circumference of the pipe,
Since the air in the inner bag and the outer bag can be exhausted, the air can be exhausted in a balanced manner, and therefore the air can be balanced between the air at the entrance of the opening and the area behind it. Therefore, (1) the exhaust time is shortened; ■Since the density of the fine powder is improved, the heat transfer coefficient can be balanced. ■The density of the fine powder becomes uniform, so
Deformation disappears. ■Furthermore, the pipe material is made of soft synthetic resin, and during vacuum evacuation there is not much difference between the internal pressure of the pack and the pressure of the vacuum evacuation furnace, so it is equipped with a timely communication circuit. After completion, when the pipe reaches atmospheric pressure, there will be a pressure difference, and the soft synthetic resin pipe will collapse and become compact. Further, the film base of the outer bag is not damaged, and stable quality can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective sectional view of a heat insulating pack showing an embodiment of the present invention, Fig. 2 is a perspective view of a pipe used in Fig. 1, and Fig. 3 is a perspective view showing a conventional heat insulating pack. FIG. 4 is a partially cutaway perspective view cross-sectional view showing an example of the manufacturing apparatus shown in FIG. 3. 1...Fine powder, 2...Inner bag, 3...Outer bag, 11...Pipe, 10...Small diameter hole. Name of agent: Patent attorney Satoshi Nakao 93 and one other person Figure 1 U Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] An inner bag containing porous fine powder, a pipe made of soft synthetic resin or the like arranged on both sides of the inner bag, and a pipe that communicates with the inner diameter of the pipe provided at an arbitrary location on the outer periphery of the pipe. A heat insulating pack consisting of a small diameter hole, an outer bag that covers the inner bag and the pipe to reduce pressure inside, and the length of the pipe is the same as or shorter than the length of the inner bag containing the porous fine powder.