JP2011021866A - Disinfectant water ice production method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technique for producing ice homogeneously containing a desired concentration of a disinfectant hypochlorite radical for use in sanitary storage, transportation and cooling of fresh products. <P>SOLUTION: In connection with the method of reducing the amount of water freezing at once and the method of reducing the temperature of water before freezing, just keeping the temperature of water at or below a certain temperature can noticeably improve available chlorine remaining in ice to implement industrial and inexpensive production of disinfectant water ice. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to a method for producing sterilizing ice containing a high concentration of hypochlorite having sterilizing power.

Ice has been used for a long time to preserve the freshness of agricultural products, marine products or fresh foods. In addition, the use of ice is widespread, such as rapid cooling after heating of foods and the like, and the use of fishery in living areas. This is based on the size of the cooling capacity based on the large heat of melting of ice, the non-influence on objects and the environment, or the abundance of resources.

However, there are problems with ice. That is, once thawed and the temperature rises, it encourages the growth and dispersion of microorganisms. In order to prevent this, there has been devised to quickly remove the water generated by melting, but this method is disadvantageous in terms of cooling energy efficiency.

In order to solve these problems, a technique using ice produced by freezing water containing a sterilizing substance has been announced. When such ice is used, it is expected that the dissolved water has a bactericidal power even when it is melted, so that bacterial contamination such as fresh food can be prevented.

Among such techniques, the technique shown in Patent Document 1 relates to electrolyzed water ice containing an active component of electrolyzed water. This is an apparatus for producing electrolyzed water ice by supplying electrolyzed water produced by an electrolyzed water producing device to an ice making part of a water storage type ice making machine. This technology manufactures ice by cooling and freezing water stored in a water storage tank for ice making. However, generally, when an aqueous solution containing impurities is frozen, only pure water is first frozen and impurities are eliminated. Eventually, the excluded impurity part will also freeze, but the distribution of impurities in ice will be biased. In addition, in the case where impurities are easily vaporized, the concentration of impurities remaining in the final ice is reduced by vaporizing during freezing.

Further, Patent Document 2 discloses a technique for making ice by bringing water containing a functional substance as an impurity into contact with an inner surface of a cylindrical ice making device, and scraping ice frozen on the inner surface. However, in this technique as well, the concentration of impurities contained in ice becomes low due to the separation of impurities in the solution.

On the other hand, Patent Document 3 discloses a technique for freezing electrolyzed water under cooling conditions of −40 ° C. or lower.
It is difficult to understand the details because the description of the amount of water to be frozen at one time and the form of the heat transfer body are unclear. Therefore, judging from a general interpretation, the problem with this technology is that if it is a water storage type ice making, the water in contact with the ice making surface freezes in a short time, there is little separation of impurities, and it is relatively non-uniform and Ice having an impurity concentration close to that of the raw water is produced. However, as the distance from the ice making surface is increased, the above-described phenomenon acts, and the separation of impurities occurs, making it difficult to produce ice with uniform impurities and high concentration.

  JP-A-11-166775   JP 2006-194500 A   JP 2002-350016 A

Therefore, the problem to be solved by the present invention is to provide a technique for producing ice containing uniformly a hypochlorous acid radical having a sterilizing power at a desired concentration.

As a result of diligent studies in preparing ice containing effective chlorine, the present inventor has come to know that high concentration of effective chlorine remains by shortening the time required for freezing as much as possible. Furthermore, as a method for shortening the time required for freezing, a method for reducing the amount of water frozen at one time and a method for lowering the water temperature before freezing were examined. As a result, only by lowering the water temperature below a certain temperature, we know that the remaining effective chlorine in ice can be dramatically improved, and that water ice for sterilization can be produced industrially and inexpensively. As a means for solving the problems, each aspect has been provided as follows.

First, a method for producing sterilized water ice, in which sterilizing water containing effective chlorine is cooled in advance to a temperature of 10 ° C. or lower and 0 ° C. or higher and then made by an ice maker, is a first aspect of the means for solving this problem. It was.

Further, in the first aspect, cooling the sterilizing water containing effective chlorine to a temperature of 8 ° C. or lower and 0 ° C. or higher in advance is a second aspect of the means for solving this problem.

Moreover, in the 1st or 2nd aspect, it was set as the 3rd aspect of the means for solving this subject that the effective chlorine concentration of the water for sterilization is 1 ppm or more and 30 ppm or less.

In any one of the first to third aspects, the sterilizing water containing effective chlorine is a slightly acidic hypochlorous acid water, which is a fourth aspect of the means for solving the problem.

The ice produced in any one of the first to fourth aspects is used as the fifth aspect of the means for solving this problem.

The following effects are brought about by the present invention. First, water for sterilization containing effective chlorine is uniformly cooled at a high residual rate by cooling the water for sterilization containing effective chlorine to a temperature of 10 ° C. or lower and 0 ° C. or higher and then making ice with an ice making machine. It is done.

Another effect brought about by the present invention is that the sterilization water containing effective chlorine is cooled in advance to a temperature of 8 ° C. or lower and 0 ° C. or higher, and then made by an ice making machine, thereby further increasing the residual rate of effective chlorine. The water ice for sterilization contained in is obtained.

Moreover, another effect brought about by the present invention is that sterilization water ice that can be used for a wide range of purposes is obtained when the effective chlorine concentration of sterilization water is 1 ppm or more and 30 ppm or less.

Further, another effect brought about by the present invention is that water for sterilization that can be used in direct contact with foods can be obtained because the water for sterilization containing effective chlorine is slightly acidic hypochlorous acid water. .

Another effect brought about by the present invention is to provide water ice for sterilization that can be used immediately anywhere by using the ice produced by the above-mentioned production method.

  Manufacturing process diagram of water ice for sterilization

The sterilizing water that can be used in the present invention may be any solution containing hypochlorite radicals, such as water in which chlorine gas is dissolved, sodium hypochlorite solution, bleached powder solution, and various types of electrolytic water.
As a method for cooling these solutions, any commonly used liquid cooling method can be used. The ice making method may be a method suitable for the purpose of ice use, such as a water storage method, a scraping method, a spray method, or a dripping method. The ice can be used in any form such as a block, crushed ice, and sherbet.

An embodiment will be described with reference to FIG. Tap water was used as raw water and supplied from the raw water inlet 1 to the slightly acidic hypochlorous acid water generator 2, and the generated slightly acidic hypochlorous acid water having an effective chlorine concentration of 24 ppm was stored in the generated water tank 3. Next, the slightly acidic hypochlorous acid water was cooled to 8 ° C. by the serpentine water cooler 5 by the feed water pump 4 and supplied to the scraping type ice making machine 6. The ice making capacity was operated at about 100 kg / h. The effective chlorine concentration of slightly acidic hypochlorous acid measured by melting the obtained crushed ice was 18 ppm. When this ice was mounted on a fishing boat and used to live fish caught by vertical fishing, the number of fish after 36 hours was less than 1/50 compared to the case of using normal ice. Also, almost no odor was felt.

Since the technology according to the present invention is effective in maintaining the quality when used for freezing fresh produce, it can be used for transporting, storing and displaying marine products and agricultural products while maintaining good quality.

1 Raw water inlet 2 Slightly acidic hypochlorous acid water generator 3 Generated water tank 4 Water supply pump 5 Serpentine water cooler 6 Scraping type ice maker 7 Ice storage box

Claims (5)

A method for producing water ice for sterilization characterized in that water for sterilization containing effective chlorine is cooled in advance to a temperature of 10 ° C. or lower and 0 ° C. or higher, and then made by an ice making machine. The method for producing water ice for sterilization according to claim 1, wherein water for sterilization containing effective chlorine is previously cooled to a temperature of 8 ° C or lower and 0 ° C or higher. The method for producing water ice for sterilization according to claim 1 or 2, wherein the effective chlorine concentration of sterilization water is 1 ppm or more and 30 ppm or less. The method for producing sterilized water ice according to any one of claims 1 to 3, wherein the sterilizing water containing effective chlorine is slightly acidic hypochlorous acid water. Water ice for sterilization produced by the production method according to claims 1 to 4.

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