JPS63259365A - Cooling method controlling endothermic reaction - 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 [Industrial Field of Application] This invention relates to a cooling method that is simple, inexpensive, and controls an endothermic reaction that allows the inside of a packaging box to be maintained at a constant low temperature range for a long period of time.

[Conventional technology]

Containers for storing and transporting food products at low temperatures can be roughly divided into two types: those with a cold source and those without.

Items with cold sources include cold storage warehouses, freezer cases, household refrigerators (those with electric coolers,
The temperature of these can be adjusted freely, and it is easy to maintain the inside of the seat at a constant temperature for a long time. However, this method requires a complicated mechanical device such as a cooler and a power source, which is disadvantageous in that it requires a large amount of cost. In the case of a freezer that cools by vaporizing liquid nitrogen (LN2), the liquid nitrogen is gradually vaporized and cooled, but it has the disadvantage that it runs out during long-term transportation.

°Also, for items that do not have a cold source, such as those found in small boxes for transportation (ice, dry ice, cold storage material, etc. are placed inside a box made of an insulating material such as Styrofoam). There are devices that keep the box at a low temperature. Although these are simple and inexpensive, they have the disadvantage that they do not have an internal cold source and cannot prevent the temperature from rising due to heat seeping into the box over time. .

In addition to the above-mentioned mechanical coolers, there are also known devices that generate cold heat that utilize the heat of dissolution of substances. This is a coolant that utilizes a chemical reaction that absorbs heat when ammonium nitrate, urea, etc. are dissolved in water.

Although this method is simple and inexpensive, it has not been used in low-temperature containers because the reaction completes in a very short time.

[Problem that the invention seeks to solve]

Freezers and refrigerators require a power source, making them unsuitable for transportation.When cooling ice, dry ice, cold storage materials, and liquid nitrogen in an insulated box, it takes a long time because outside air gradually enters the box. This invention attempts to solve the problem that it cannot be used for cooling for hours, and that cooling by dissolving ammonium nitrate, urea, etc. in water ends in a very short time.

[Means for solving problems]

Ammonium nitrate (NH, lNo3) or urea (H2NC) separated or covered with a water-soluble membrane in a water-insoluble container.
0NH2) Alternatively, a coolant consisting of a mixture of ammonium nitrate and urea is sealed, and when used, water or ice is placed in the container, and the coolant is mixed over time to cause an endothermic reaction. When it comes into contact with water, the coolant in the melted part of the water-soluble film causes an endothermic reaction and cools it down, and by doing this sequentially over time, the problem is solved by maintaining the cooling effect for a long time. It is something.

〔Example〕

In the case of Figures 1 to 3, a water-insoluble bag-shaped container (1)
A water-soluble membrane or permeable membrane (2) with a lattice-like or valve-like interior.
A coolant (4) made of ammonium nitrate, urea, or a mixture of the two is enclosed in a part of the compartment (3) separated by the water-soluble membrane (2), leaving a part of the compartment (3) in the other compartment (3). death,
A water inlet (5) that can be airtightly sealed is provided in the compartment (3) that does not contain the coolant (1).

In the system shown in Figures 4(a) and 4(b), a water-insoluble bag-like container (6) is partitioned by a water-insoluble membrane (7) in a lattice pattern.
8). In addition, the membranes (7) are alternately opened slightly at the ends in each row, and water-soluble membranes are provided in the openings (9), leaving the compartments (8) in the first row and the other compartments (8). The coolant (4) is sealed in the container. .

A water inlet Cl0) that can be kept airtight is provided in the compartment (8) in which the coolant (4) is not sealed.

Figures 5 and 6 show bag-like containers with a water-insoluble membrane on the outermost side.
, and inside are bags (I4) formed integrally with a water-soluble membrane or permeable membrane, and tea bags 0υ and bags (13 and bags ( The coolant (4) is sealed between 121 and a part of the container 0 is opened.
3) Form. The opening Oa is formed so that it can be airtightly and firmly sealed after water or ice is put inside.

In the case of FIGS. 7 and 8, the coolant (4) is sealed in capsules αω made of gelatin thin films of various thicknesses, and one of the capsules is placed in a number of bottle-shaped containers (1ω or synthetic resin). In the case of container Q6), the cap is removed and water or ice is poured from the mouth of the container (16), after which the cap (181) can be sealed airtight. The bag-like container (I7) made of synthetic resin is provided with a water supply port U→, and the pond portion is sealed so that water can be poured from the water supply port α.

In the case of Fig. 9, the coolant (4) is sealed inside a bag made of gelatin membranes of various thicknesses, and the bag (2) is turned into a bag-shaped container t17) made of synthetic resin similar to that shown in Fig. 8. Please enclose it in (
It is something.

Fig. 10 shows a box Cυ with an open top, which is made of styrofoam and has a lid plate (2) and a bottom plate and side plates of the box (21) that are hollow, with openings 23 on both sides of the inner plate; 2
3) When inserting and using the charged coolant from the section,
The charged coolant can be used without moving (and without interfering with the contents).

It goes without saying that the box (2+) can be used by putting water or the like into a container such as a bag or bottle containing the cooling material, sealing the container, and putting the container together with the contents in a normal state.

[For production]

When the present application is used, when water or ice is poured into the bag-like or bottle-like container of the above-described embodiment and the contents are placed in the box Cυ, water is adjacent to the container shown in FIGS. 1, 2, and 3. Water melts or penetrates the water-soluble membrane or permeable membrane (2), causes an endothermic reaction with the coolant (4) in the first compartment (3), and rapidly cools the water in the first compartment (3). As it passes, it melts or penetrates the next water-soluble membrane or permeable membrane (2), causing an endothermic reaction with the coolant (4) in the next compartment (3), and this action continues for a long time. The inside of the box (2I) is cooled over the entire period.

In the case of the one in Figure 4, water is poured into the compartment (8) in the first row, sealed, and placed in the box CD (and then the next compartment (8) is opened from the opening without the membrane (7). Water penetrates inside and coolant (・1)
While causing an endothermic reaction, water spreads over the metal body inside the compartment (8) and rapidly cools it down. While an endothermic reaction occurs in the first compartment (8), water permeates from the end of the next compartment (.Moreover, the openings (9) are provided alternately in a staggered manner. As a result, this action continues to cool the inside of the box Cυ over a long period of time.

In the case of the ones shown in Figures 5 and 6, water or ice is poured into the opening α to melt the innermost bag (121), or it penetrates the bag (121) and causes an endothermic reaction with the first coolant (4). Cool, then remove from the first bag (1
After the endothermic reaction in the coolant (21) is completed, the next bag (121) is melted or the next bag (121) is permeated into the next bag (121) to cause an endothermic reaction in the next coolant (4) and cooled down, and this action continues in sequence. cools the inside of the box (2I) for a long time.

It is something that

It is something that can be done.

The ones in Figures 7, 8, and 9 are bottle-shaped or can-shaped containers (
16) Or, put water in a bag-shaped container aD and then put it in the cylinder Cυ, melt the coatings of different thickness sequentially from the thinner one to cause an endothermic reaction, and cool it down. It is something that continues.

In other words, if you put the contents of the box, which is an insulated container, at a temperature lower than the ambient temperature Ta and seal it, then if you put a cold storage agent (melting point 2 T2) at a temperature of T into the box, the cold storage agent Due to the effect of T, the time at which the cold storage agent is maintained at a low temperature becomes longer as shown by line B in Figure 11, but after the cold storage agent melts, the temperature still rises.
This leads to a.

Therefore, when the container containing the coolant in the present invention is placed in a box together with its contents, the box is present because the coolant intermittently causes an endothermic reaction as shown by line C in FIG.

〔effect〕

A8 It is simple and does not require a mechanical cooler.

b. Cold storage time can be dramatically increased,
It is now possible to transport fresh foods over long distances without having to freeze them, which was previously impossible.

Since the inside of the C1 box can be maintained within a certain temperature range, it is suitable for systems that require strict adherence to a certain temperature range, such as so-called freezing temperatures and partial freezing, for which demand has been increasing in recent years.

[Brief explanation of drawings]

Figures 1 and 2 are perspective views of the first and second embodiments;
4(A) is a perspective view of the third embodiment, FIG. 4(B) is a sectional view of the same, FIG. 5 is a partially cutaway perspective view of the fourth embodiment, and FIG. The figure is a sectional view of the same part, FIG. 7 is a perspective view of an embodiment of a bottle-shaped container, FIGS. 8 and 9 are perspective views of an embodiment of a bag-shaped container containing a coolant, and FIG. 10 is an embodiment. FIG. 11 is a partially cutaway perspective view of a box containing a refrigerant container, and FIG. 11 is a graph diagram showing the state of an endothermic reaction.

Claims (1)

[Claims] (1) A coolant consisting of ammonium nitrate or urea, or a mixture of ammonium nitrate and urea, partitioned or covered with a water-soluble membrane is sealed in a water-insoluble container, and before use, water or ice is poured into the container to cool the container. 1. A cooling method that controls an endothermic reaction, which comprises controlling the mixture of agents over time to cause an endothermic reaction.