JP2008011767A - Method for producing 'saku' of frozen tuna - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing "saku" (oblong large-size fish meat cut off from the bones) of frozen tuna by which frozen tuna suppressed in generation of drip, applicable to short-time thawing without loss and keeping springy palate feeling of raw tuna. <P>SOLUTION: The method for producing "saku" of frozen tuna comprises treating tuna having the same freshness as that of freshly treated tuna into a "saku" state, vacuum-packaging the "saku"-state tuna with a deep squeezing package machine followed by freezing the packaged tuna in electric field-imparted antifreeze liquid. A system for producing "saku" of frozen tuna comprises a combination of the deeply squeezing package machine and a brine freezing freezer which can impart the electric field to the antifreeze liquid. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for producing frozen tuna mash, and more particularly to a method for producing frozen tuna mash that has been processed and frozen in the state of “saku”, which is one stage before sashimi.

Frozen tuna is often distributed in the market as large blocks, and it takes time to thaw (for example, usually 1 hour or more depending on the size). Therefore, for example, in sushi restaurants, etc., daily consumption is predicted, and a tuna amount corresponding to that amount is prepared in advance, but in many cases the amount exceeding consumption is thawed. It is easy to waste. In addition, frozen tuna has a problem that the texture of “mochimochi” peculiar to fresh raw tuna is lost, and the quality of the tuna drops due to the occurrence of drip due to thawing.
Patent Document 1 discloses a brine freezing method in which an electric field is applied to an antifreeze liquid for freezing and a freezing apparatus therefor as a freezing method that reduces the occurrence of drip at the time of thawing.
JP 2001-292553 A

  The present invention provides a frozen tuna that solves the above-described problems of frozen tuna, suppresses the occurrence of drip, can be thawed in a short time without waste, and retains the texture of raw tuna For the purpose.

  As a result of intensive studies, the present inventor processed tuna having a good freshness into “saku”, a deep-drawing packaging machine, and a refrigeration method and a refrigeration apparatus disclosed in JP-A-2001-292753. It discovered that the target frozen tuna was obtained by freezing with the combined system, and came to complete this invention.

That is, the present invention
(1) A method for producing frozen tuna, characterized by processing live tuna or tuna having a freshness equivalent thereto, vacuum-packing with a deep-drawing packaging machine, and then freezing in an antifreeze with an electric field applied ,
(2) The method for producing a frozen tuna pad according to the above (1), wherein the ceramic sheet is closely attached to the pad and vacuum packed.
(3) The method for producing a frozen tuna cake according to the above (1) or (2), which is packaged with a polyethylene film and an aluminum laminate / nylon film,
(4) The method for producing a frozen tuna cake according to (1) above, wherein the antifreeze is an aqueous ethanol solution,
(5) To provide a frozen tuna production system, etc., which is a combination of a deep-drawing packaging machine and a brine refrigerating apparatus that can apply an electric field to the antifreeze.

  According to the present invention, by processing the tuna into the “squeezed” state, the desired amount can be thawed in a short time, for example, about 5 to 8 minutes without waste. In addition, products that maintain the texture of raw tuna, which is made of fresh tuna, which is vacuum-packed with freshness and frozen in an antifreeze with an electric field, preventing drip from thawing. Obtainable.

  In the present invention, live tuna or tuna having a freshness equivalent to that is used. Examples of such tuna include near-sea tuna, for example, natural live tuna from Kishu Katsuura. The processing to “saku” can be performed while maintaining the freshness by a known method.

  The tuna processed into “saku” is individually packaged in a vacuum package by a deep drawing packaging machine using a roll film having two different properties. The film to be used is not particularly limited as long as it has cold resistance and heat sealability and can be used for packaging food with this type of packaging machine. For example, a tray shape filled with tuna cake A combination of a transparent polyethylene film and an aluminum laminate / nylon film used to seal the tray as the lower film formed into the above-mentioned film. The deep-drawing packaging machine to be used is not particularly limited, but a vacuum mold that can be controlled in units of 1 mb and a high-precision molding die that can mold the tray so that the tray does not excessively press the tuna cake that is the contents after vacuum packaging. A packaging machine with a degassing system is desirable. Further, when packaging, the sterilization effect by the far-infrared effect of the ceramic sheet can be utilized by closely attaching the ceramic sheet to the tuna and filling the tray. Furthermore, a packaging provided with a single corner full-open opening edge is preferable so that the contents can be easily taken out from the vacuum packaging.

Vacuum-packed tuna can be frozen in an antifreeze with an electric field. As the antifreeze, for example, a 40 to 60% ethanol aqueous solution can be used, and an electric field is applied by applying a potential of 5 to 100 kv at -20 to -50 ° C, and it is immersed and frozen for 10 to 60 minutes. By adopting such a refrigeration method, the passage time of the maximum ice crystal formation zone can be shortened, the destruction of the tuna drilling tissue can be minimized, and the occurrence of drip can be suppressed.
The obtained frozen macro drill is distributed in an environment with little temperature change.
At the time of use, it is thawed in water, preferably running water, as it is in vacuum packaging. It can be thawed in about 5 to 8 minutes, and can be used as sashimi by removing tuna cake from the package and cutting it into an appropriate thickness.
The present invention will be described in more detail with reference to examples below, but the present invention is not limited thereto.

Natural live straw tuna from Kishu Katsuura was processed and vacuum packed with a deep-drawing packaging machine (Tokyo Food Machinery Co., Ltd., Mulch Bag).
As shown in FIG. 1 attached, first, a film fed from a lower roll 1 of a low density polyethylene film (Tosero Co., Ltd., Tosero TUX FC-S) is continuously formed in a tray mold 2 by vacuum, compressed air and heat. It was molded into a tray shape. Each formed tray 3 was transported to a filling area 4 by a belt conveyor, and tuna cake with a ceramic sheet adhered thereto was filled into each tray one by one.
Next, the upper part of the tray is covered with an aluminum laminate nylon film (Unitika Ltd., Emblem ONM) upper roll 5 that is fed with the nylon side down, and transported to heat seal and vacuum escapement system 6 for heat seal. Vacuum packaging was performed under the conditions of a temperature of 96 ° C. and a degree of vacuum of 7.1 to 11.0 mb.
After vacuum packaging, it was cut into individual pieces with a horizontal cutter and a vertical cutter to obtain a vacuum-packed tuna cake.
The obtained vacuum-packed tuna cake was frozen in an antifreeze with a 55% ethanol aqueous solution as an antifreeze and an electric field applied thereto using a brine freezer (quick freezer).
As shown in FIG. 2 of the accompanying drawings, the brine refrigerating apparatus has an electrically insulated freezing tank 10 in which a 55% ethanol aqueous solution is put as an antifreeze and a stirrer 9 is provided. There is a net shelf 12 on which tuna troughs 11 vacuum-packed are arranged, and the net shelf 12 can be moved up and down as indicated by a block arrow, and the vacuum-packed tuna trough 11 is placed in the antifreeze liquid in the freezing tank 10 while being lowered. So that it can be immersed in The freezing tank 10 is provided with a high-potential electric field generating means 13, and the lower part thereof is a heat absorption part 14. The heat absorption part 14 is connected to a refrigerator 15, and an antifreeze liquid (block arrow) circulating in the freezing tank 10. Is cooled by the heat absorption part 14, and the tuna pad 11 vacuum-packed can be frozen.
Using such a brine refrigerating apparatus, a potential of 10 kv is applied by a high potential electric field generating means 13 in a 55% ethanol aqueous solution at −35 to −38 ° C., and frozen for 20 to 40 minutes to obtain a frozen tuna paddle. It was.

  As described above, according to the present invention, a new frozen tuna product can be obtained that can be thawed in a short time in an amount suitable for consumption, and can provide consumers with a “mochimochi” texture of raw tuna.

3 is a schematic flowchart of the deep-drawing packaging machine used in Example 1. FIG. 1 is a schematic diagram of a brine refrigeration apparatus used in Example 1. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lower roll 2 Tray mold 3 Tray 4 Filling area 5 Upper roll 6 Heat seal, vacuum deaeration system 7 Horizontal cutter 8 Longitudinal cutter 9 Stirrer 10 Freezer tank 11 Vacuum packaging tuna pad 12 Net shelf 13 High potential electric field generating means 14 Endothermic part 15 Refrigerator

Claims (3)

  A method for producing frozen tuna, characterized in that hot tuna or tuna having a freshness equivalent to that is processed in advance, vacuum-packed by a deep-drawing packaging machine, and then frozen in an antifreeze liquid to which an electric field is applied.   2. The method for producing frozen tuna according to claim 1, wherein the ceramic sheet is vacuum-packed with the ceramic sheet in close contact. A system for producing a frozen tuna paddle, which is a combination of a deep-drawing packaging machine and a brine refrigerating apparatus that can apply an electric field to antifreeze.

Images