| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a professional-use quick freezing apparatus with which an extremely low temperature set to -50°C or the like unsuitable for large-sized food materials such as tuna in conventional supercool freezing processing can be applied to the food materials, so that the food materials maintain their favorable freshness with less discoloration and deterioration when thawed. <P>SOLUTION: The quick freezing apparatus includes conductive shelf boards 11 each of which placing a thick food material thereon, a food material-loading carriage 10 having insulators 12 electrically insulating the shelf boards 11, electrodes 20 each inserted and disposed into the vicinity of the center of the thick food material; and an electric field-forming device 30 applying alternate high-voltage electric field on the food material-loading carriage 10 and the electrodes 20. In the apparatus, the thick food materials are each frozen sequentially from its outer peripheral side toward its center part in a freezer while the electric field-forming device 30 applies the alternate high-voltage electric field on the thick food materials to perform the supercool freezing processing. The alternate high-voltage electric field is applied to each of the thick food materials even after a freeze-up region is generated at the outer peripheral side of the thick food material because each of the electrodes 20 is located at an unfrozen portion inside the thick food material, so that the supercool freezing processing to the unfrozen portion is continued. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
