JPH10267476A - Method for manufacturing ice containing ozone - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily obtain ice containing ozone that can maintain the freshness of perishable foods for a long time by allowing the ice containing raw material ozone to contact the surface of a smoothing member being cooled at a specific temperature, scraping off ice that is generated by rapid cooling and refrigerating from the smoothing member as an ice piece, and cooling the mixture of the ice piece and the mixed water. SOLUTION: When ice containing ozone with the sterilization operation of ozone and a storage operation at or below a freezing point is manufactured, ozone that is generated by performing the electrolysis of water is directly dissolved to water, thus preferably generating water containing ozone with a concentration of 1 ppm or higher. Then, water containing ozone is allowed to contact the surface of a smoothing member being cooled to 0 deg.C, preferably -10 deg.C or less and is rapidly cooled and refrigerated preferably within three minutes for generating ice. Then, the ice is forcibly scraped off, thus manufacturing a cracked or foil-shaped ice. Then, an ice piece and a mixed water are loaded into a can body that is cooled to a freezing point or less and then the mixture is cooled along with the can body, thus freezing the mixture and obtaining ice containing a block-shaped ozone.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing ozone-containing ice having both the sterilizing action of ozone and the storage action at a temperature below freezing point, and more particularly, to the storage of fresh food products such as fresh fish and vegetables. Also, the present invention relates to a method for producing ozone-containing ice, which can improve freshness retention performance in transportation and provides sterilization, deodorization and freshness retention effects in various fields.

[0002]

2. Description of the Related Art The effects of ozone sterilization, disinfection, deodorization, decolorization, etc. are well known, and the effect of ozone is used to maintain freshness during storage or transportation of fresh foods such as fresh fish or vegetables. Technology has been proposed. This is because, in addition to the excellent action of ozone, which is the target action, such as sterilization, ozone is relatively quickly decomposed into oxygen. Because it is extremely safe.

On the contrary, since the decomposition of ozone occurs quickly as described above, the sterilizing action of ozone or the like cannot be used for a long time without an ozone generator.
Incidentally, the half-life of ozone water used for sterilizing fresh foods is about 30 minutes at 10 ° C. in tests by the present inventors.

[0004] Therefore, the ozone-containing water is kept in an ice state to enable long-term storage of ozone, and the ozone ice is gradually melted to generate ozone for a long period of time, so that the sterilization effect of ozone is reduced. A technology that can be maintained for a long time has been proposed.
No. 4343, Japanese Utility Model Publication No. 7-54241, Japanese Patent Application Laid-Open No. 60-29569).

As a method for producing this ozone-containing ice, there is disclosed a method for producing ozone-containing ice by spraying cold water containing ozone on an evaporator surface (Japanese Patent Laid-Open No. 29569/1985).

[0006]

However, in this method, since ice is produced by spraying ozone-containing water on an evaporator, it takes several hours until the ozone-containing water is cooled and frozen to obtain block ice. Cost. For this reason,
There is a disadvantage that most of the ozone is decomposed by the time block ice is obtained. Therefore, it was difficult to obtain a desired high concentration ozone ice.

On the other hand, if a rapid cooling method is adopted,
Ice containing ozone in the raw ozone-containing water almost as it is can be obtained. For example, Japanese Utility Model Publication No. 7-49331 discloses that
The peripheral surface of the horizontal drum placed in the water tank is used as an ice making surface, and a cooling auxiliary unit having a heat insulating surface is provided at a predetermined interval on the outer surface of the drum to supply ozone water containing a predetermined concentration of ozone into the water tank. An ice maker that freezes the ozone water on the outer surface of the drum is disclosed. However, according to this method, only foil-shaped ozone-containing ice can be obtained, and such foil-shaped ozone-containing ice melts relatively early when the ice is used, and the desired long-term frozen It cannot be stored or used for a long time.

[0008] The present invention has been made in view of the above problems, and it is possible to obtain a sterilizing effect of ozone and the like over a long period of time and to maintain the freshness of fresh food such as fresh fish or vegetables for a long period of time. It is an object of the present invention to provide a method for producing ozone-containing ice which enables the production of ice.

[0009]

The method for producing ozone-containing ice according to the present invention is characterized in that the raw ozone-containing water is brought into contact with the surface of a smooth member cooled to 0 ° C. or less, and then rapidly cooled and frozen on the surface. A step of generating ice on the smoothing member, a step of forcibly scraping the obtained ice from the smoothing member to obtain a small flake or foil-like ice piece, and mixing the ice piece with mixed water or mixed ozone. Cooling the mixture with the contained water to obtain block-shaped ozone-containing ice.

In the method for producing ozone-containing ice, the ozone concentration of the raw ozone-containing water is 1 ppm or more, preferably 4 ppm or more, and the mixed ozone-containing water is preferably 4 ppm or more.

It is preferable that the raw material ozone-containing water is frozen on the smooth member within 3 minutes. For this reason, it is preferable that the smooth member is cooled to −10 ° C. or less.

Further, as the mixed water, water containing 2% or more of sodium chloride can be used. Still further, the raw material ozone-containing water may be generated by directly dissolving ozone generated by electrolysis of water in the water.

In the present invention, mixed water or mixed ozone-containing water is mixed with small-sized or foil-shaped ozone-containing ice chips, and this mixture is further cooled to form block-shaped ozone-containing ice. Thus, ozone-containing ice in a block shape can be easily produced. In the case of this blocky ice,
Ozone in ice is gradually generated because it does not melt easily. Therefore, effects such as sterilization and deodorization by ozone can be ensured for a long period of time, and freshness retention performance in storage and transportation of fresh food products, particularly fresh fish can be maintained for a long period of time.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the accompanying drawings. FIG. 1 is a flowchart showing a method according to an embodiment of the present invention. First, ozone-containing water containing ozone at a high concentration is prepared (raw material ozone-containing water preparation step S1). This raw material ozone-containing water can be generated by directly dissolving ozone generated by electrolysis of water in the water. The ozone-containing water thus generated contains ozone at a high concentration. One example of a specific apparatus for producing this ozone-containing water is described in JP-A-8-134677.

In the apparatus for producing ozone-containing water described in this publication, an anode electrode and a cathode electrode to which a DC voltage is applied are overlapped on one surface and the other surface of the solid electrolyte membrane, and supplied to the anode electrode side. The water is electrolyzed to obtain ozone water. A noble metal wire mesh with an ozone generation catalytic function is used for the anode electrode, and on the outer surface side of the anode electrode,
A lath net made of a corrosion-resistant metal is superimposed, and the anode electrode and the lath net are closely inserted into a jacket having a water inlet at one end and an ozone water outlet at the other end. As described above, ozone generated by electrolyzing water is directly dissolved in the water, so that ozone-containing water containing ozone at a high concentration can be obtained.

Then, this ozone-containing water is used as raw material ozone-containing water and brought into contact with the surface of a smooth member cooled to 0 ° C. or lower (step S2), and the frozen portion is forcibly scraped off at the contact portion to remove small debris. An ice in the shape of a strip or foil is manufactured (step S3). There are various methods of contacting the ozone-containing water with the smooth member, such as spraying. Also,
This smooth member can be made of a material having good ozone corrosion resistance, such as stainless steel, and the smooth member can be kept at 0 ° C. or lower by flowing a refrigerant at 0 ° C. or lower through the inside. By cooling the smoothing member to a temperature of -10 ° C or lower, a rapid cooling effect of ozone-containing water can be obtained, and ozone ice with high ozone storage efficiency can be obtained. Then, the ice generated on the smooth member is forcibly scraped off to obtain a small crushed or foil-shaped ice piece containing ozone.

In the state of the high-concentration ozone-containing small flakes or foil pieces, for example, when used as a material for maintaining freshness of fresh food, the ice is contained therein while being melted. It is necessary to release ozone and exert the effect of maintaining the freshness due to the ozone, but since the ice is in the form of small fragments or foil pieces, it melts relatively early, and the effect of maintaining the freshness during long-term storage is reduced. I can't get it.

Therefore, in the next step, the ice pieces are blocked. In this ice block, the melting gradually progresses, so that freshness can be maintained during long-term storage.

More specifically, the above-mentioned small-concentration or foil-shaped ice containing high-concentration ozone is put into an ice can (a can body cooled below freezing point), and water (mixing) is placed in the ice can containing the ice pieces. Water) and mix the ice pieces and the mixed water (Step S)
4). Next, the mixture in the ice can is cooled together with the ice can, thereby freezing the mixture to obtain block-shaped ozone-containing ice (step S5).

At this time, if the ozone-containing ice in the form of small flakes or foils is melted due to the mixing of the mixed water, it becomes difficult to obtain a block-like ice containing an ozone component at a sufficiently high concentration. Therefore, it is beneficial to cool the water to be mixed to a temperature close to 0 ° C. as much as possible. However, since the melting heat of ice is sufficiently larger than the specific heat of water, even if it takes a long time to supply ordinary tap water as it is and to freeze the ice on the block-shaped ice, it may be in the form of small pieces or foil pieces. It does not mean that the ozone-containing ice in the shape melts. For this reason, even if tap water is used, ice containing ozone can be obtained.

On the other hand, if high-concentration ozone water is used as the filling water, a higher-concentration ozone-containing block ice can be obtained.

Ozone is said to be effective for sterilization, yeast, mold, virus, and other powdery bacteria, and is widely used for preserving foods. Among them, almost all gram-negative bacteria, that is, pathogenic bacteria and fluorescent light are used. Bacteria, Escherichia coli, spirits, etc. can be killed with a low concentration of ozone, but spores covered with a shell require at least 4 ppm of ozone. In addition, ozone water used as raw water is also 4 pp.
m or more is required.

Furthermore, if water containing 2% or more of sodium chloride, for example, seawater, is used as the raw material water for filling, small flakes or foil flakes are placed in sherbet-like seawater ice. A situation can be established where ozone-containing ice is present. As a result, a higher sterilization effect (pseudo salting effect and ozone sterilization effect) can be obtained.

In order to stably obtain an ozone concentration of 4 ppm or more, ozone water is not produced by dissolving once produced high-concentration ozone gas in water.
As shown in JP-A-390, it is preferable to use ozone water produced by a direct electrolytic ozone water generator as raw water. The ozone-containing water generated by the direct electrolysis type ozone water generator was extremely useful because the ozone gas was not dispersed in the water but was dissolved in the water.

The handling of the ozone-containing ice according to the present embodiment is completely the same as that of ordinary ice. When the ice is thawed, it does not need to be regarded as harmful, although it has a slight smell of ozone. It is odorless and has no adverse effects on skin contact.

Further, in applying the present invention, it is not inevitable to add other components having other preservative effects such as alum to ozone ice.

[0027]

EXAMPLES Examples of the present invention will be described below in comparison with comparative examples. The production conditions of the ozone-containing ice of the example and the comparative example are as follows. Ozone water generator 10 liter / min by direct electrolysis ozone generator
Thus, ozone-containing water having an ozone water amount of 10 ppm was obtained. Manufacture of ozone ice From ozone-containing water with a raw ozone water concentration of 10 ppm, -1
An ozone-containing ice piece in the form of a foil piece was produced using a smooth member cooled to 5 ° C. This is a comparative example.

Next, about 80% by volume of the above-mentioned piece of foil piece (comparative example) was placed in an ice can, and the rest was filled with raw water having a concentration of about 2 ° C. and an ozone water concentration of 10 ppm, and mixed. Let it. Thus, a block-shaped ozone-containing ice (Example) was obtained. Performance Comparison 0.3 kg of the ozone-containing ice per 1 kg of fresh fish was used to cool the fresh fish,
The state of the fish after a lapse of time was examined. As a result, in the case of the comparative example, the eyeball was slightly cloudy and the outer skin was glossy. However, although the flesh was soft and could withstand raw food, the grade was evaluated to be significantly inferior to the example. On the other hand, in the case of the example, it was judged that the raw material could be eaten without any difference from the initial product, with the centerpiece being transparent, the outer skin being glossy, and the flesh having elasticity.
In the case of the examples, no growth was observed for the cells.

[0029]

As described above, the ozone-containing ice according to the present invention is an effective method for long-term storage of fresh food, especially for fresh fish, since it gradually generates ozone for a long period of time. It can not only suppress the growth of the body but also prevent deterioration of meat quality, and is extremely useful for maintaining freshness of fresh food.

[Brief description of the drawings]

FIG. 1 is a flowchart illustrating a method according to an embodiment of the present invention.

Claims (8)

[Claims] 1. A process in which raw ozone-containing water is brought into contact with the surface of a smooth member cooled to 0 ° C. or lower, and rapidly cooled and frozen on the surface to produce ice on the smooth member. A step of forcibly scraping from the smooth member to obtain small pieces or foil pieces of ice pieces, and cooling a mixture of the ice pieces and mixed water or mixed ozone-containing water to form block-shaped ozone-containing ice. A method for producing ozone-containing ice. 2. The ozone concentration of the raw material ozone-containing water is 1
The method for producing ozone-containing ice according to claim 1, wherein the concentration is not less than ppm. 3. The method for producing ozone-containing ice according to claim 1, wherein the raw material ozone-containing water is frozen on the smooth member within 3 minutes. 4. The method for producing ozone-containing ice according to claim 1, wherein the smoothing member is cooled to -10 ° C. or lower. 5. An ozone concentration of said raw material ozone-containing water is 4
The method for producing ozone-containing ice according to claim 2, wherein the concentration is not less than ppm. 6. An ozone concentration of the mixed ozone-containing water is 4
The method for producing ozone-containing ice according to any one of claims 1 to 5, wherein the concentration is not less than ppm. 7. The method for producing ozone-containing ice according to claim 1, wherein the mixed water is water containing 2% or more of sodium chloride. 8. The water containing ozone as a raw material is produced by directly dissolving ozone generated by electrolysis of water into the water.
The method for producing ozone-containing ice according to any one of the above items.