System and method for producing block ice treated with nitrogen substitution
Inactive Publication Date: 2016-11-17
SHOWA FREEZING PLANT
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Benefits of technology
The present invention is about a method for producing a special type of ice that contains no oxygen and can help keep fresh food and other products fresher for longer. This ice is made by cooling water while adding nitrogen gas, which results in a block of ice that contains a high level of nitrogen. This ice can be used for various purposes such as storing and cooling food, and it helps prevent oxidation and bacteria growth. Compared to regular ice, this special ice has lower levels of dissolved oxygen, which can cause damage to the environment in which it is stored.
Problems solved by technology
It is known, however, that the method with aeration cannot produce highly transparent ice.
Japanese Unexamined Patent Application Publication No. 2007-225127 discloses a way to freeze water containing micro bubbles of gas such as air, nitrogen, oxygen, carbon dioxide, or ozone, for producing gas-containing ice with bubbles being confined as they are, by which, however, transparent ice cannot be produced.
Method used
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Embodiment Construction
[0026]A preferred embodiment of the present invention will be described with reference to the accompanying drawings. The block ice to which the present invention is applied is ice which can be called an “ice pillar” in the shape of a cuboid, e.g., a cube. The maximum standardized ice commonly available in Japanese market is highly transparent block ice weighing 135 kg, which is a pillar-shaped ice 280 mm long, 550 mm wide, and 1080 mm high. It should be noted that the block ice to which the present invention is applied is not limited to the ice having the above size though reference will be made hereinafter taking the ice with the above size as an example. If the length of each axis of a block ice is within the range of ±20% of that of the above standardized block ice, such block ice is considered equal to the standardized block ice. In addition, the present invention is also applied to the block ice weighing over about 20 kg.
[0027]FIG. 1 is a schematic view showing a system for pro...
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A system for producing block ice may include a nitrogen gas supplying unit for supplying nitrogen gas under pressure; a cooled nitrogen-dissolved water producing unit for producing nitrogen-dissolved water, which is provided with a water receiving tank for storing material water, a cooler for cooling the water stored in the water receiving tank, and a nitrogen gas injector for injecting nitrogen gas supplied from the nitrogen gas supplying unit into the water stored in the water receiving tank; and a nitrogen-substitution block ice producing unit, which is provided with a plurality of ice cans immersed in a brine tank kept at a freezable temperature for water, a filling device for filling each of the ice cans with the nitrogen-dissolved water supplied from the nitrogen-dissolved water producing unit, and a gas injector for injecting nitrogen gas supplied from the nitrogen gas supplying unit into an unfrozen portion of the nitrogen-dissolved water.
Description
CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims priority to Japanese Patent Application No. 2015-098972, filed on May 14, 2015, which is hereby incorporated by reference in its entirety.FIELD OF THE INVENTION[0002]The present invention relates to a system and a method for producing pillar-shaped ice, or block ice, by means of freezing water in which dissolved oxygen is substituted with nitrogen.BACKGROUND ART[0003]Japanese Unexamined Patent Application Publication No. 2007-155172 discloses that the surface of water in a fish hold is covered with nitrogen-gas-filled ice, which is produced by freezing water containing nitrogen gas, and that the nitrogen-gas-filled ice thaws to reduce the amount of dissolved oxygen in the water in the hold, allowing for keeping fish fresh.[0004]Japanese Unexamined Patent Application Publication No. 2007-282550 discloses that nitrogen gas is dissolved in marinade for processing fresh food, which is then frozen in an icemaker to becom...
Claims
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Login to View More IPC IPC(8): F25C1/20F25C5/00
CPCF25C5/00F25C1/20F25C1/00F25C1/18
Inventor WAKAYAMA, TOSHITSUGI
Owner SHOWA FREEZING PLANT