JPH0617038A - Multilayer cold storage agent - Google Patents

Abstract

PURPOSE:To provide a multilayer cold storage agent which can keep a temperature below the freezing point for a long time. CONSTITUTION:A central cold storage agent 1 is surrounded by an adjoining cold storage agent 4, which is surrounded by an adjoining cold storage agent 7, which is surrounded by a cold storage agent 8 to form a multilayer cold storage agent 9. The respective cold storage agents 1, 4, 7 and 8 are arranged in an increasing order of the melting points of for example, -25 deg.C, -15 deg.C, -5 deg.C, and 0 deg.C. Since a difference in the temperature between each cold storage agent and the surrounding atmosphere can be reduced, the release of chilliness can be retarded and the melting time can be prolonged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cold storage agent capable of keeping fresh seafood, fruits, vegetables, flowers immediately before flowering, or pharmaceuticals at a low temperature for a long time.

[0002]

2. Description of the Related Art A cold storage agent is a gel in which a cryogen such as ethylene glycol or salt is mixed in a box-shaped container made of plastic, a bag made of polyethylene, vinyl, non-woven fabric, or a container such as a can. It is filled with water-absorbent resin in the form of pudding or pudding, and after being frozen in a freezer, it is supplied and used for cold storage such as a cold storage box.

[0003] Such a regenerator can obtain a desired melting temperature by changing the concentration of the cryogen such as ethylene glycol or salt, and 0, -5, -15, -2 can be obtained.
It is possible to make a cold storage agent that is subdivided at 5 ° C.

When such a cold storage agent is put in a cool box to keep fresh seafood or the like cold, the temperature at which the fresh seafood is held is usually about 5 ° C. higher than the melting temperature of the cold storage agent. That is, when kept cold with a regenerator having a melting temperature of 0 ° C, fresh seafood is kept at about + 5 ° C. Therefore, when it is desired to keep fresh seafood at 0 ° C, a cold storage agent at -5 ° C is used.

[0005]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
Regenerators with melting points below 5, such as 5, -25 ° C,
Even if it can be kept cool at a low temperature, the difference from the ambient temperature is large, so the ice melts in a short time, and the time that can be kept cool is 5
~ 6 hours was the limit.

The present invention has been made to solve this problem, and an object thereof is to provide a cold storage agent capable of maintaining a temperature below freezing for a long time.

[0007]

In order to achieve the above object, the present invention is characterized in that a plurality of regenerators having different melting points are wrapped in order from one having a lower melting point to form a multi-layered structure. . Further, it is desirable that the melting point be made different by changing the concentration of the cryogen added to the cold storage agent.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a cool storage agent. This cold storage agent 1 is made by injecting a content agent through an opening 3 of a bag 2 formed of a film-shaped material such as polyethylene or vinyl and then closing the opening 3. As the content agent, for example,
A pudding- or gel-shaped water absorbent resin mixed with a cryogen such as ethylene glycol or salt is used. By changing the concentration of the freezing agent in the content agent, a cold storage agent having a desired melting point can be obtained.

FIG. 2 is a view showing a state in which the cold storage agent 1 formed in FIG. 1 is covered with another cold storage agent 4. That is, the cool storage agent 1 is put in the hollow portion of the large bag 5, the contents having different melting points are injected into the hollow portion, and the opening 6 is closed to form the cool storage agent 4. At this time, it is desirable that the cool storage agent 1 therein is completely wrapped in the cool storage agent 4.

After that, the cold storage agent 4 is put in a larger bag, and the contents agents having different melting points are injected to make the cold storage agent which wraps the cold storage agent 4. After that, the same procedure is repeated, and a regenerator with a desired number of layers is completed.

FIG. 3 is a view showing a cross section of the cold storage agent thus formed. In this figure, the cold storage agent 1 is the cold storage agent 4
And then sequentially wrapped with the cold storage agents 7 and 8 to form a multi-layered cold storage agent 9 of four layers.

In such a four-layer cold storage agent 9, for example, the melting points from the most central first layer to the outermost fourth layer are −25, −15, −5, respectively. The melting point is lowered toward the center, such as 0 ° C. However, two successive layers may have the same melting point for convenience.

With this structure, the temperature difference between each regenerator and the ambient temperature around it is small, so that the amount of cold air that escapes from the regenerator to the outside can be reduced.
The melting rate of the cold storage agent can be made much slower than in the case of the single-layer structure, and as a result, cold storage for a long time becomes possible.

In the above description, the method of manufacturing a regenerator using a polyethylene or vinyl bag as the container has been described. However, even if a container such as a resin box or can is used, it can be similarly formed. Would be obvious.

Next, an example in which fresh seafood is actually kept cold by using a multi-layer type cold storage agent having the following four-layer structure will be explained. As the regenerator, 4 pieces of 1 kg were used. Each cold storage agent used ethylene glycol as a freezing agent, and each layer had the same structure as shown below. The first layer in the center weighs 100 g and the concentration of cryogen is 3%.
Melting temperature -13 ° C The second layer weighs 200 g and the concentration of the cryogen is 2% Melting temperature -7 ° C The third layer weighs 300 g and the concentration of the cryogen is 2% Melting temperature -7 ° C The outermost layer The fourth layer weighs 400 g and has a freezing agent concentration of 0%.
Melting temperature 0 ℃

The above-mentioned multi-layered cold storage agent is frozen in a home refrigerator, and a styrofoam cool box (600 mm × 400 mm) is used.
(mm × 300 mm), 4 of these regenerators and 5 kg of fresh seafood pre-cooled to −3 ° C. were stored. Ambient temperature 30
When the temperature of the fresh seafood was measured after leaving it for 48 hours at 0 ° C., it was found to be 0 ° C., which was sufficient freshness to be eaten by sashimi. In the case of the cold storage agent, the layer with a high melting temperature on the surface was melted, but the center portion was still frozen. From this, it can be seen that the cold storage agent as a whole maintained approximately -5 ° C.

For comparison, a similar experiment was conducted with a conventional regenerator. That is, 1 kg x 4 cold storage agents at -5 ° C were used, and the other conditions were the same. However, in this case, the regenerator was completely melted after only 10 hours from the start of the experiment.

[0018]

As described above, according to the cold accumulating agent of the present invention, a plurality of cold accumulating agents having different melting points are sequentially wrapped from the one having a lower melting point to form a multi-layered cold accumulating agent itself. There is a special effect that the time that can be kept for a long time can be greatly extended, and that the cold storage time can be greatly extended.

[Brief description of drawings]

FIG. 1 is a perspective view showing a cold storage agent placed at the center of a multilayer cold storage agent of the present invention.

FIG. 2 is a perspective view showing a state in which the cold storage agent of FIG. 1 is wrapped with the next cold storage agent.

FIG. 3 is a cross-sectional view showing the structure of a multi-layered cool storage agent of the present invention.

[Explanation of symbols]

 1,4 Regenerator 2,5 Bags 3,6 Opening 9 Multi-layer regenerator

Claims (2)

[Claims] 1. A multi-layered cold storage agent, characterized in that a plurality of cold storage agents having different melting points are wrapped in order from the one having the lowest melting point to form a multi-layered cold storage agent. 2. The multi-layered cold storage agent according to claim 1, wherein the melting point is made different by changing the concentration of the cold storage agent added to the cold storage agent.