JP4079968B2 - Nitrogen gas-filled ice, nitrogen gas-filled ice production device, nitrogen gas-filled ice production method, fresh fish preservation device, and fresh fish preservation method - Google Patents

Description

  The present invention is used to suppress the generation of germs that can occur during the preservation and transport of fresh food such as seafood, fruits and vegetables, and livestock meat, to suppress oxidation, and to maintain freshness, nitrogen gas sealed in ice with nitrogen gas dissolved The present invention relates to ice, a manufacturing apparatus thereof, and a manufacturing method.

  Traditionally, maintaining freshness of fresh foods sterilizes tap water, groundwater and seawater from production, manufactures cold water and ice or ozone-injected ice (Patent Document 1), and rinses, processes, transports and stores products. It is used for etc.

  In addition, cold water may be cooled to near zero degrees Celsius in order to maintain freshness, and cold water stuffing and ice stuffing methods are often used to maintain freshness of fresh foods in order to reduce the growth of germs. However, the amount of gas such as oxygen that dissolves in water increases with decreasing temperatures. Therefore, cold water and ice have a problem that there is a large amount of dissolved oxygen as a medium for oxidation. The following table shows the relationship between temperature and atmospheric oxygen solubility. Temperature is in degrees Celsius and atmospheric oxygen solubility is expressed in DO or milligrams per liter.

  Moreover, although ice containing ozone has a bactericidal effect, it also has a problem of causing oxidation.

Patent Document 1 discloses an ozone ice manufacturing apparatus. Patent Document 2 discloses a storage using nitrogen gas. Patent Document 3 discloses a nitrogen production apparatus that obtains nitrogen from the atmosphere. Patent Document 4 discloses fresh food storage ice containing hypochlorous acid. Patent Document 5 discloses a nitrogen gas circulation deoxygenation device. Non-Patent Document 1 points out that there is a case in which decay from the inside proceeds when fresh ozone is used. Non-Patent Document 2 mentions the application of nitrogen gas replacement packaging to seafood. Non-Patent Document 3 mentions that as soon as the dissolved oxygen decreases, it dies as a problem of transporting live fish.
Japanese Patent Laid-Open No. 9-105568 Japanese Patent Laid-Open No. 9-224563 Japanese Patent Laid-Open No. 2005-200245 Republication No. 00-8156 JP 2000-176436 A Ota Shizuyuki, Nakayama Masao "Food Cleaning and Foreign Object Removal" Jinshokan June 1993 Distribution System Research Center Co., Ltd. “Seafood Freshness Maintenance Manual” Quarterly issue of Fresh Food System Volume 31 Volume 3 Volume 395 Issued on June 10, 2002 Ota Shizuyuki "Freshness preservation of fishery products, revised edition" Tsukuba Publishing Co., Ltd.

  The problem to be solved is to solve the problem that conventional cold water and ice have a large amount of dissolved oxygen and accelerate the oxidation and deterioration of fresh products by containing ozone. That is, the objective of this invention is providing the ice which suppresses oxidation, its manufacturing apparatus, and a manufacturing method.

  The present invention has been completed with the idea of reversing the idea that, in the past, there has been a common sense that oxygen must be supplied when trying to preserve fresh fish or the like in an aquarium. In other words, giving up maintaining the life of the individual, the oxygen solubility in the aquarium is lowered for the purpose of preventing oxidation and spoilage in order to maintain the freshness of the fish meat and the built-in structure. Therefore, it was considered appropriate to use ice frozen from water in which nitrogen was dissolved.

Table 2 shows data of experiments conducted by the inventor from 10:00 am to 15:30 on November 12, 2005. The weather on the day was clear and the temperature at 10am was 11 degrees Celsius. A tank of 300 liters was prepared, and after 300 liters of tap water was injected, it remained stationary for 30 hours until the start of the experiment. Nitrogen gas in a cylinder was 3.5 cubic meters. Of the 5 hours from 10:30 to 15:30, adjust the injection pressure of nitrogen gas into the water for 1 hour from 11:00 to 12:00, continuously from 12:00 to 15:30 with 0.2 Pascal Continued to infuse. A commercially available product called an oxygen dissolved concentration meter (or dissolved oxygen meter, DO sensor) was used for the amount of dissolved oxygen in water. As can be seen from this experiment, the amount of dissolved oxygen in the water is clearly reduced by injecting nitrogen gas into the water.
Based on this finding, the inventor of the present invention invented the nitrogen gas-sealed ice according to the present invention. That is, the invention according to claim 1 is a water tank for storing fresh fish caught for the purpose of preventing oxidation and spoilage in order to immediately kill the fresh fish caught in the water tank and to maintain the freshness of fish meat and internal organs as a tissue. Nitrogen gas-filled ice used to lower the degree of dissolved oxygen in the water, where nitrogen gas is dissolved in the water in the water tank, and the water in which the amount of dissolved oxygen is reduced is frozen with an ice making machine and filled with nitrogen gas The ice is produced, and the produced nitrogen gas-filled ice is further returned to the water tank to cover the surface of the water, and the ice dissolves in the water tank to further dissolve nitrogen gas in the water in which the amount of dissolved oxygen is reduced. Then, it is nitrogen gas sealed ice that is frozen again with an ice maker .

The invention according to claim 2 is a method for immediately killing freshly caught fish in an aquarium and maintaining the freshness of fish meat and internal organs as a tissue to prevent oxidation and spoilage. A nitrogen gas-filled ice production apparatus for producing nitrogen gas-filled ice used to lower the oxygen solubility, a nitrogen gas extractor for extracting nitrogen gas in the atmosphere, and nitrogen extracted from the nitrogen gas extractor A nitrogen gas dissolver that mixes the gas with the water in the water tank; and an ice maker that freezes the nitrogen gas dissolved water in which the nitrogen gas generated by the nitrogen gas dissolver is dissolved. The enclosed ice is produced, and the produced nitrogen gas-filled ice is returned to the water tank so as to cover the water surface, and the nitrogen gas is further dissolved in the water in which the amount of dissolved oxygen is reduced by melting the ice in the water tank. Let it freeze again with the ice machine A nitrogen gas-filled ice production device for causing.

The invention according to claim 3 is a method for killing freshly caught fish immediately in the aquarium and maintaining the freshness of the fish meat and internal organs as a tissue to prevent oxidation and spoilage. A nitrogen gas-filled ice production method for producing nitrogen gas-filled ice used for lowering the degree of dissolved oxygen, wherein the nitrogen gas extraction step extracts nitrogen gas in the atmosphere, and the nitrogen gas extraction step extracts the nitrogen gas-filled ice. A nitrogen gas dissolving step for mixing nitrogen gas with water in the water tank, an ice making step for freezing the nitrogen gas dissolved water dissolved in the nitrogen gas generated in the nitrogen gas dissolving step with an ice making machine, and the ice making step. The nitrogen gas-filled ice that has been frozen by freezing is returned to the water tank so as to cover the water surface, and the ice that has been returned to the water tank in the nitrogen gas-filled ice circulation step is placed in the water tank. Oxygen dissolved amount to dissolve more nitrogen gas to reduce the water by solvable, a nitrogen gas-filled ice manufacturing method comprising the re-freezing step of freezing in ice machine.
The invention according to claim 4 is a method for killing freshly caught fish in an aquarium and maintaining the freshness of fish meat and internal organs as a tissue to prevent oxidation and spoilage. A fresh fish storage device used to reduce the degree of dissolved oxygen, a nitrogen gas extractor that extracts nitrogen gas in the atmosphere, and the nitrogen gas extracted from the nitrogen gas extractor is mixed with the water in the water tank A nitrogen gas dissolver and an ice maker for producing nitrogen gas-filled ice by freezing nitrogen gas-dissolved water produced by the nitrogen gas dissolver and producing nitrogen-containing ice, and the nitrogen produced by the ice maker The gas-filled ice is returned to the water tank so as to cover the water surface, and when the ice melts in the water tank, the nitrogen gas is further dissolved in the water in which the amount of dissolved oxygen is reduced, and is frozen again by the ice making machine. Fresh and characterized by circulating It is a storage device.
The invention according to claim 5 is a nitrogen gas extraction step for extracting nitrogen gas in the atmosphere, and a nitrogen gas to be mixed with water in a water tank for storing fresh fish caught by the nitrogen gas extracted in the nitrogen gas extraction step. A melting step, a nitrogen gas-filled ice production step for producing nitrogen gas-filled ice by freezing the nitrogen gas-dissolved water in which the nitrogen gas generated in the nitrogen gas-melting step is melted with an ice making machine, and the nitrogen gas-filled ice The nitrogen gas-filled ice produced in the production step is returned to the water tank so as to cover the water surface, and the ice returned to the water tank in the nitrogen gas-filled ice circulation step is returned to the water tank. A re-ice-making step in which nitrogen gas is further dissolved in the water in which the amount of dissolved oxygen is reduced by being melted in the ice, and the ice is frozen again by an ice-making machine, and the ice frozen in the re-ice-making step is further added to the water tank. Nitrogen gas-filled ice recirculation step to return, quick killing step in which the fish caught is immediately put into the tank and killed immediately, and fresh fish whose life as an individual was killed in the quick kill step is further stored in the tank. And the fresh fish preservation | save method which consists of a structure body freshness maintenance step which maintains the freshness as a structure body .

If the nitrogen gas-sealed ice of the present invention is used, not only the water temperature in the water tank is lowered, but also the effect of lowering the oxygen solubility in two ways can be expected. One, if Tokere nitrogen gas filled ice is that a low oxygen dissolved of water, other covers the surface of the water in the water tank to the nitrogen gas enclosure ice floats on water, air It is to prevent the oxygen inside from dissolving in the water in the water tank. Furthermore, according to the nitrogen gas sealed ice manufacturing apparatus and manufacturing method according to the present invention, it is possible to take nitrogen in the atmosphere and dissolve it in water to manufacture nitrogen gas sealed ice.

  In the experiment described in Table 2 above, a nitrogen gas cylinder was used, but it is more desirable to extract and use nitrogen in the atmosphere. A nitrogen production apparatus for obtaining nitrogen from the atmosphere as shown in Patent Document 3 is known. As a commercially available product, a deaeration device provided by Katayama Chemical Co., Ltd. in Higashiyodogawa-ku, Osaka can be used. Nitrogen gas-filled ice is produced by sucking water from a water tank at a constant flow rate, injecting nitrogen gas along the way, sending it to an ice making machine through an oxygen dissolved concentration meter, and making ice.

  FIG. 1 is a block diagram illustrating the configuration of the first embodiment. Air 101 in FIG. 1 indicates air in the atmosphere. The nitrogen gas extractor 102 can use the deaeration device provided by Katayama Chemical Co., Ltd. described above. The water in the water tank 103 can be in various cases such as seawater, tap water, and well water (hereinafter, the same applies to water). Water in the water tank 103 is pumped up at a constant flow rate by a pump (not shown) and flows toward the ice making machine 106. On the way, nitrogen gas extracted by the nitrogen gas extractor 102 is injected into running water by a nitrogen gas dissolver 104 at a predetermined pressure by a compressor or the like, passed through an oxygen dissolved concentration meter 105, and then an ice making machine 106. To. And it becomes ice, and the nitrogen gas enclosure ice 107 is manufactured.

  FIG. 2 is a block diagram illustrating the configuration of the second embodiment. The air 201 and the nitrogen gas extractor 202 in FIG. 2 are the same as those in the first embodiment. In the present embodiment, the nitrogen gas extracted by the nitrogen gas extractor 202 is expelled and injected into the water in the water tank 203 at a predetermined pressure. If necessary, a compressor may be provided between the nitrogen gas extractor 202 and the water tank 203 to increase the pressure for the explosion. In this way, the amount of dissolved oxygen in the water tank is reduced, and the oxygen dissolved concentration meter 205 is sent to the ice making machine 206 to produce the nitrogen gas-filled ice 207. .

FIG. 4 is a block diagram illustrating the configuration of the third embodiment. The air 301 in FIG. 4 is the same as in the first and second embodiments. Water in the water tank 303 is pumped up at a constant flow rate by a pump (not shown) and flows toward the ice making machine 306. In the middle, nitrogen gas extracted by the nitrogen gas extractor 302 is injected into running water by a nitrogen gas dissolver 304 at a predetermined pressure by a compressor or the like, passed through an oxygen dissolved concentration meter 305, and then an ice making machine 306. To. And it becomes ice and nitrogen gas sealed ice is manufactured. The feature of this embodiment, the nitrogen gas sealed inlet ice lies in returned to the water tank 303 thus produced. Water in the water tank 303 cooled by a nitrogen gas seal inlet ice, as the temperature is lowered, for the oxygen dissolved amounts of gas will be increased also nitrogen. Therefore, it is meaningful to circulate again and dissolve nitrogen gas to produce nitrogen-filled ice and return it to the water tank. Furthermore, by the nitrogen gas sealed entrance icy water surface in the water tank 303, there is also a sense airborne oxygen is prevented from blend in water.

FIG. 3 is a block diagram illustrating the configuration of the fourth embodiment. The air 401 and the nitrogen gas extractor 402 in FIG. 3 are the same as those in the second embodiment. In the present embodiment, the nitrogen gas extracted by the nitrogen gas extractor 402 is blown and injected into the water in the water tank 403 at a predetermined pressure. If necessary, a compressor may be provided between the nitrogen gas extractor 402 and the water tank 403 to increase the pressure for the explosion. In this way, the amount of dissolved oxygen in the water tank is reduced, and the oxygen dissolved concentration meter 405 is sent to the ice making machine 406 to produce nitrogen gas-filled ice 407. The feature of this embodiment, the nitrogen gas sealed inlet ice lies in returned to the water tank 403 thus produced. Nitrogen gas sealing water chilled water tank 403 by entering ice, as the temperature is lowered, for the oxygen dissolved amounts of gas will be increased also nitrogen. Therefore, it is meaningful to circulate again to dissolve the nitrogen gas to produce nitrogen gas- filled ice and return it to the water tank. Furthermore, by the nitrogen gas sealed entrance icy water surface in the water tank 403, there is also a sense airborne oxygen is prevented from blend in water

    The nitrogen gas extractor uses a machine that extracts nitrogen from air in the atmosphere, but is a device that requires a power source. In that respect, by using a nitrogen gas cylinder, it is possible to supply an unnecessary nitrogen gas.

  In each of the above four embodiments, an oxygen dissolved concentration meter is provided. However, it is also possible to return the ice produced without sufficiently reducing the oxygen solubility to the water tank and reuse it. This is because it is possible to further reduce the oxygen solubility by circulation. Further, in the ice making machines 106, 206, 306, and 406, it is possible not only to produce completely solid ice, but also to produce sherbet-like ice and return it to the water tank. This is because it helps reduce water temperature and oxygen solubility.

  The water tank in the above four embodiments can be used as it is as a water tank used to store fresh fish caught by a fishing boat or the like.

It is possible to provide ice that is suitable for storing the produced food in an aquarium and particularly suitable for storage of seafood. In particular, it is suitable for use in an aquarium for storing fresh fish caught on a fishing boat. Marine fish are said to die as soon as the oxygen uptake capacity is much weaker than freshwater fish and the amount of dissolved oxygen decreases. Pacific saury and Sabanado, and yet when you put in the ship's water tank alive at the time of production, from long rage, better to killing immediately put in a little ice water of oxygen dissolved amount, leading to the freshness of such organization or internal organs.

1 is a block diagram illustrating a configuration of Embodiment 1. FIG. FIG. 3 is a block diagram illustrating a configuration of a second embodiment. FIG. 6 is a block diagram illustrating a configuration of a third embodiment. FIG. 9 is a block diagram illustrating a configuration of a fourth embodiment.

Explanation of symbols

101, 201, 301, 401 Air 102, 202, 302, 402 Nitrogen gas extractor 103, 203, 303, 403 Water tank 104, 304 Nitrogen gas dissolver 105, 205, 305, 405 Oxygen dissolved concentration meter 106, 206, 306, 406 Ice maker 107, 207 Nitrogen-filled ice

Claims (5)

Used to reduce the oxygen solubility in the aquarium where the freshly caught fish is stored in order to prevent the oxidation and spoilage in order to prevent the fish from catching fresh fish immediately in the aquarium and maintaining the freshness of the fish meat and internal organs. Nitrogen gas sealed ice,
Nitrogen gas is dissolved in the water in the water tank, and water in which the amount of dissolved oxygen is reduced is frozen with an ice making machine to produce nitrogen gas-filled ice, and the produced nitrogen gas-filled ice is further returned to the water tank. Nitrogen gas-filled ice obtained by further dissolving nitrogen gas in water in which the amount of dissolved oxygen is reduced by melting the ice in the water tank so as to cover the water surface, and then freezing again with an ice making machine . Used to reduce the oxygen solubility in the aquarium where the freshly caught fish is stored in order to prevent the oxidation and spoilage in order to prevent the fish from catching fresh fish immediately in the aquarium and maintaining the freshness of the fish meat and internal organs. A nitrogen gas-sealed ice production apparatus for producing a nitrogen gas-sealed ice,
A nitrogen gas extractor for extracting nitrogen gas in the atmosphere;
A nitrogen gas dissolver for mixing nitrogen gas extracted from the nitrogen gas extractor with water in the water tank ;
Nitrogen gas dissolver at Ri and ice making machine freezing nitrogen gas dissolved water dissolved in the generated nitrogen gas Tona, to produce a nitrogen gas enclosure ice at the ice machine, the nitrogen gas filled ice produced The water tank is returned to the extent that it covers the water surface, and the ice is melted in the water tank, so that nitrogen gas is further dissolved in the water in which the amount of dissolved oxygen is reduced, and the ice maker again freezes the water. nitrogen gas-filled ice production equipment you. Used to reduce the oxygen solubility in the aquarium where the freshly caught fish is stored in order to prevent the oxidation and spoilage in order to prevent the fish from catching fresh fish immediately in the aquarium and maintaining the freshness of the fish meat and internal organs. A method for producing nitrogen gas-filled ice for producing nitrogen gas-filled ice,
A nitrogen gas extraction step for extracting nitrogen gas in the atmosphere;
A nitrogen gas dissolving step in which the nitrogen gas extracted in the nitrogen gas extraction step is mixed with water in the water tank ;
An ice making step of freezing the nitrogen gas-dissolved water in which the nitrogen gas produced in the nitrogen gas dissolving step is dissolved in an ice making machine ;
A nitrogen gas-filled ice circulation step for returning the nitrogen gas-filled ice frozen in the ice making step to the water tank so as to cover the water surface;
A re-ice-making step in which the ice returned to the water tank in the nitrogen gas-filled ice circulation step is melted in the water tank, so that the nitrogen gas is further dissolved in the water in which the amount of dissolved oxygen is reduced, and frozen in an ice making machine; A method for producing ice filled with nitrogen gas.   Used to reduce the oxygen solubility in the aquarium where the fresh fish is stored in order to prevent the oxidation and spoilage in order to prevent the fish and fish from being killed immediately in the aquarium and to maintain the freshness of the fish meat and internal organs. A fresh fish storage device,
  A nitrogen gas extractor for extracting nitrogen gas in the atmosphere;
  A nitrogen gas dissolver for mixing nitrogen gas extracted from the nitrogen gas extractor with water in the water tank;
  An ice making machine for producing nitrogen gas-filled ice by freezing nitrogen gas-dissolved water in which nitrogen gas is generated by the nitrogen gas dissolver;
  The nitrogen gas-filled ice produced by the ice making machine is returned to the water tank so as to cover the water surface, and the ice is melted in the water tank so that the amount of dissolved oxygen is further reduced to nitrogen. A fresh fish preservation device, wherein gas is dissolved, frozen again with the ice making machine, and circulated.   A nitrogen gas extraction step for extracting nitrogen gas in the atmosphere;
  A nitrogen gas dissolving step in which the nitrogen gas extracted in the nitrogen gas extraction step is mixed with water in an aquarium for storing fresh fish caught;
  A nitrogen gas-filled ice production step for producing nitrogen gas-filled ice by freezing the nitrogen gas-dissolved water in which the nitrogen gas produced in the nitrogen gas-melting step is melted with an ice making machine;
  A nitrogen gas-filled ice circulation step for returning the nitrogen gas-filled ice produced in the nitrogen gas-filled ice production step so as to cover the water surface in the water tank;
  Re-ice-making step in which the ice returned to the water tank in the nitrogen gas-filled ice circulation step is dissolved in the water tank so that the amount of dissolved oxygen further dissolves in the nitrogen gas and is frozen again with an ice making machine. When,
  A nitrogen gas-filled ice recirculation step for returning the ice frozen in the re-ice-making step to the water tank;
  Immediate killing step in which fresh fish caught is put into the aquarium and killed immediately;
  Tissue body freshness maintaining step of further storing the fresh fish whose life as an individual was killed in the instant killing step in the water tank, and maintaining the freshness of the tissue body;
  A method for preserving fresh fish.

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