JP6173796B2 - Packaged food, packaged food manufacturing equipment, processed food storage method - Google Patents

Description

  The present invention relates to a packaged food in which processed gas is filled with a mixed gas and packaged, a packaged food manufacturing apparatus, and a method for storing the processed food.

  In general, processed foods processed from fresh foods, etc., the freshness during processing decreases with the passage of time. The major factors that cause a decrease in freshness include deterioration due to oxidation and decay due to the propagation of microorganisms and fungi. Conventionally, a method of packaging processed food in a container in a state in which oxygen is removed has been proposed as a technique for preventing a decrease in freshness of the processed food. Oxygen is a factor that oxidizes food ingredients and lowers the flavor and hue, and is an essential element for the activity of most microorganisms and fungi. It is effective as a preservation method for preserving processed foods for a long period of time without lowering.

  However, microorganisms and fungi are not killed even in a state where oxygen is lost. Therefore, if a trace amount of oxygen remains in the container, the microorganisms and fungi may grow. For such a problem, a storage method disclosed in Patent Document 1 or Patent Document 2 has been proposed. Patent Document 1 discloses a packaging pack in which an inari sushi packaging container is filled with a mixed gas composed of carbon dioxide, nitrogen gas, and ethyl alcohol. According to Patent Document 1, in the packaging pack, the internal gas is replaced with a mixed gas at a replacement rate of 80% or more. In Patent Document 2, egg products are stored in an airtight packaging container, and the packaging container is filled with a food storage gas containing ethyl alcohol, and then the packaging container is sealed and heated in a pressurized state. A preservation method for sterilization is disclosed. According to Patent Document 2, in the packaging container, the internal gas is replaced with food preservation gas by a vacuum exhaust device at a replacement rate of 99.5%. As a result, even if microorganisms or fungi remain in the container, the amount of oxygen can be reduced by substituting the internal gas with a mixed gas, and the microorganisms and fungi become inactive by the carbon dioxide gas. Almost all microorganisms and fungi are killed by the bactericidal action of alcohol. As a result, the processed food can be stored for a long time.

JP 2004-350595 A JP 09-285253 A

  However, when a food is filled with a mixed gas containing alcohol, the flavor, texture, color, etc. of the processed food may be impaired depending on the alcohol concentration. As a result of earnest research on the ratio of alcohol in the mixed gas used when sealing and storing processed foods, the present applicant has long processed foods while maintaining the flavor, texture and color of processed foods. We succeeded in finding a ratio that can be stored for a period.

  The present invention has been made in view of the above circumstances, and its purpose is that it can be stored for a long period of time without degrading the freshness of the processed food without losing the flavor, texture, color, etc. of the processed food. An object of the present invention is to provide a packaged food, a packaged food manufacturing apparatus, and a processed food storage method.

  In the present invention, processed food is stored in a container having a gas barrier property, and the container is filled with a mixed gas containing an inert gas, carbon dioxide gas, and 1.0 wt% to 5.0 wt% alcohol in a mass% concentration. It is configured as a packaged food characterized by being sealed. Further, the replacement ratio of the mixed gas with respect to the existing gas in the container is 95% to 99%. A specific example of the inert gas is nitrogen gas, and a specific example of the alcohol is ethyl alcohol. As such processed food effective as packaged food, marine products obtained by processing and drying fry are suitable. As the mixed gas, those containing 1.0 wt% to 5.0 wt% of ethyl alcohol, nitrogen gas, and carbon dioxide gas are suitable. More specifically, a mixed gas containing 2.5 wt% ethyl alcohol, 50 wt% nitrogen gas, and 47.5 wt% carbon dioxide gas is preferable.

  In addition, the present invention provides a transport unit that transports a container having a gas barrier property in which processed food is stored, a storage unit that stores the container transported by the transport unit, and an inert gas during transport by the transport unit. , Carbon dioxide gas, and a gas supply means for supplying a mixed gas containing 1.0 wt% to 5.0 wt% of alcohol in mass% concentration to the storage portion and filling the inside of the container with the mixed gas, and the storage It can also be grasped as a packaged food manufacturing apparatus comprising sealing means for joining and sealing the periphery of the upper surface opening of the container discharged from the section with a film member. The manufacturing apparatus includes, for example, a pair of pressing rollers provided at both ends in the transport direction by the transport unit in the housing unit. A pair of pressing rollers presses the film member against the upper surface of the container. In this configuration, the gas supply means has a pipe that supports the film member between the pair of pressing rollers at a position spaced upward from the container, and the mixed gas supplied from the outside to the pipe is supplied to the pipe. The mixed gas is ejected from a nozzle hole formed in a pipe toward the container.

  Conventionally, the gas in the container is individually replaced by using an evacuation device or the like. However, as the manufacturing apparatus of the present invention is configured as described above, the container is automatically transferred in the process of being transferred by the transfer means. The gas in the container is replaced with the mixed gas at a high replacement rate. Thereby, it becomes possible to easily produce a large amount of packaged food in which the inside is replaced with the mixed gas at a high replacement rate.

  In addition, the present invention stores processed food in a container having gas barrier properties, and a substitution rate of 95% for a mixed gas containing an inert gas, carbon dioxide gas, and 1.0 wt% to 5.0 wt% alcohol in mass% concentration. It can also be grasped as a method for preserving processed food, which is characterized by filling the container so as to be -99% and sealing the container.

  Since the packaged food of the present invention encloses the processed food in a container using a mixed gas containing an inert gas, carbon dioxide gas, and an alcohol having a mass% concentration of 1.0 wt% to 5.0 wt%, the antioxidant is prevented. Oxidation of processed foods can be prevented without adding food additives such as agents. In addition, since microorganisms and fungi can be sterilized with moderate alcohol, the processed food can be stored for a long time without degrading the freshness of the processed food without impairing the flavor, texture, color, etc. of the processed food. Can do.

  In addition, according to the packaged food production apparatus of the present invention, the mixed gas can be sealed in the container at a substitution rate of 95% or more, and the packaged food can be easily produced in large quantities at a time. it can.

  Moreover, the preservation | save method of the processed food of this invention is made so that it may become 95%-99% of substitution rate for the mixed gas containing 1.0 wt%-5.0 wt% of alcohol by an inert gas, a carbon dioxide gas, and a mass% concentration. Since the container is filled with the container and the container is hermetically sealed, it is possible to prevent oxidation of the processed food without adding a food additive such as an antioxidant, similar to the packaged food, Since microorganisms and fungi can be sterilized with an appropriate alcohol, the processed food can be stored for a long period of time without impairing the flavor, texture and color of the processed food.

It is a figure which shows an example of the packaged food which concerns on embodiment of this invention, FIG. 1 (A) is a perspective view, FIG.1 (B) is sectional drawing of the cutting line IB-IB in FIG. 1 (A). . It is a fragmentary sectional view which shows the structure of the manufacturing apparatus which manufactures the packaged food of FIG. It is a figure which shows the structure of the manufacturing apparatus which manufactures the packaged food of FIG. 1, FIG. 3 (A) is a side view, FIG.3 (B) is a top view.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings as appropriate. The embodiment described below is merely an example embodying the present invention, and the embodiment of the present invention can be changed as appropriate without departing from the scope of the present invention.

  FIG. 1 is a diagram illustrating a configuration of a packaged food 10 according to an embodiment of the present invention. As shown in FIG. 1, the packaged food 10 contains the processed food 13 in a bottomed box-shaped container 11 having an open upper surface, and is filled with a predetermined mixed gas in the container 11. The film 12 is bonded to the upper opening of the container 11 and the inside of the container 11 is hermetically sealed.

  The container 11 is formed in a rectangular parallelepiped shape that is larger in the horizontal direction than in the vertical direction, and has a gas barrier property (airtightness). The container 11 is manufactured by, for example, blow molding a plastic raw material or vacuum forming a plastic sheet. The container 11 may have any shape as long as it has gas barrier properties, and may be made of any material. For example, it does not have a fixed shape as in the present embodiment, but may be a bag-like container. Specific examples of the material of the container 11 include polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride, polyethylene terephthalate, ABS resin, ethylene-vinyl acetate resin, ethylene-vinyl alcohol resin, polyamide, polycarbonate, and the like.

  The film 12 is formed by molding a polymer component such as a synthetic resin into a thin film. The film 12 is thermally welded to the periphery of the upper opening of the container 11 by a manufacturing apparatus 20 described later, and is made of a material having gas barrier properties. The film 12 may be colored or colorless, but is preferably transparent or translucent so that the processed food 13 accommodated in the container 11 can be visually recognized from the outside. Moreover, when the film 12 is transparent or translucent, it is preferable that it is a UV cut film which does not permeate | transmit an ultraviolet-ray. Examples of the film 12 include a polyethylene film, a polyvinyl chloride film, a polyvinyl alcohol film, a polypropylene film, a polyester film, a polycarbonate film, a polystyrene film, and a nylon film.

  As the mixed gas filled in the container 11 in an airtight manner, a gas containing nitrogen gas, carbon dioxide gas, and alcohol which is an example of an inert gas is used. The mass% concentration of alcohol in the entire mixed gas is 1.0 wt% to 5.0 wt%. In an embodiment of the present invention described later, a mixed gas containing 50 wt% nitrogen gas, 47.5 wt% carbon dioxide gas, and 2.5 wt% ethyl alcohol is used. The mixed gas is filled in the container 11 in an airtight manner when the film 12 is thermally welded to the container 11 by the manufacturing apparatus 20 described later. At this time, the replacement ratio of the mixed gas with respect to the existing gas before filling in the container 11 is 95% to 99%.

  As the processed food 13 stored in the container 11 as the packaged food 10, processed larvae processed and dried are used. Specific examples of the processed food 13 include fried shirasu, dried shirasu, and chirimen. These processed foods 13 are adapted for long-term storage as packaged foods 10 and have a high effect of preventing deterioration in freshness and flavor. Of course, the processed food 13 is not limited to processed larvae, but seafood such as seaweed, kelp, mozuku, hijiki, and dried seafood, such as seafood and agricultural and livestock products, are used as direct raw materials. The primary processed food is preferably processed without significantly changing its food properties. By storing such a primary processed food as the packaged food 10, a very high long-term storage effect can be obtained as the packaged food 10.

  In addition, the packaged food 10 of this embodiment does not contain any additives other than the components contained in the mixed gas. Further, in the state where the processed food 13 is stored in the container 11 and the packaged food 10 is manufactured, no heat sterilization treatment is performed. This is because a sufficient sterilization effect and storage effect can be obtained by filling the mixed gas at a high replacement rate, specifically, 95% or more and 99% or less using the manufacturing apparatus 20 described later. It is.

  Hereinafter, with reference to FIG.2 and FIG.3, the manufacturing method 20 of the packaged food 10 performed using the manufacturing apparatus 20 of the packaged food 10 and the manufacturing apparatus 20 is demonstrated. Here, FIG. 2 is a diagram illustrating a configuration of the manufacturing apparatus 20 for manufacturing the packaged food 10. 3 is a diagram showing the configuration of the manufacturing apparatus 20, FIG. 3 (A) is a side view of the manufacturing apparatus 20, and FIG. 3 (B) is a plan view of the manufacturing apparatus 20. In addition, in FIG. 3, illustration of the apparatus main body 21 of the manufacturing apparatus 20 is abbreviate | omitted.

  As shown in FIG. 2, the manufacturing apparatus 20 includes an apparatus main body 21, a belt conveyor 22 (an example of a conveyance unit), a gas box 24 (an example of a storage unit), welding press devices 26 and 27 (an example of a sealing unit), A film punching device 28, a sheet supply unit 31, a sheet winding unit 32, and the like are provided.

  The belt conveyor 22 is disposed below the apparatus main body 21. The belt conveyor 22 stretches an endless belt 22A with a driving roller 22A and a driven roller 22B. The belt conveyor 22 conveys the container 11 containing the processed food inside to the processing space 33 formed below the apparatus main body in a state of being placed on the belt 22C, and further passes through the processing space 33 from the apparatus main body 21. Is also transported downstream in the transport direction. In the present embodiment, in the process in which the container 11 passes through the processing space 33 of the manufacturing apparatus 20, the packaged food 10 is manufactured by being sealed with the film 12 while the container 11 is filled with the mixed gas. In addition, conveyance means, such as another belt conveyor, are provided in the conveyance direction downstream of the manufacturing apparatus 20, and the manufactured packaged food 10 is further conveyed by the said conveyance means.

  In the belt conveyor 22, the container 11 is fixed on the belt 22C. As a method for fixing the container 11, for example, an opening in which the lower portion of the container 11 can be fitted is formed in the belt 22C, and a method for fixing the container 11 to the opening is applicable. Of course, the fixing method of the container 11 is not limited to the said method. Further, as shown in FIG. 3A, a plurality of containers 11 are fixed to the belt 22C in a state where a plurality of containers 11 are arranged in the depth direction of the belt 22C (direction perpendicular to the paper surface of FIG. 2). Is conveyed to the processing space 33.

  As shown in FIG. 2, the apparatus main body 21 is provided above the belt conveyor 22. The apparatus main body 21 is supported by a frame (not shown). The apparatus main body 21 is provided with actuators, control devices, and controllers for operating or controlling the belt conveyor 22, the gas box 24, the welding press apparatuses 26 and 27, the film punching apparatus 28, and the like. Further, an operation display panel 35, operation buttons, a display device, a press setting device (all not shown) and the like are provided on the side surface of the apparatus main body 21.

  The gas box 24, the welding press devices 26 and 27, and the film punching device 28 are provided in the processing space 33. In the present embodiment, the gas box 24, the welding press device 26, the welding press device 27, and the film punching device 28 are arranged in this order from the upstream side to the downstream side in the conveying direction by the belt conveyor 22. Therefore, when the container 11 is transported to the processing space 33 by the belt conveyor 22, the container 11 sequentially passes through the gas box 24, the welding press device 26, the welding press device 27, and the film punching device 28.

  The sheet supply unit 31 is a sheet roller that holds the film 12 in a continuous belt shape. The sheet supply unit 31 is provided upstream of the apparatus main body 21 in the conveyance direction, and both ends thereof are rotatably supported by a frame (not shown). The sheet winding unit 32 is a sheet roller that holds the film 12 after being punched by the film punching device 28 in the processing space 33 in a continuous belt shape. The sheet winding unit 32 is provided downstream of the apparatus main body 21 in the transport direction, and both ends thereof are rotatably supported by a frame (not shown). The film 12 supplied from the sheet supply unit 31 is led downward, and then is folded back to the inside of the processing space 33 by a rotating roller 36 provided near the entrance 33A of the processing space 33, so that the upper surface of the container 11 It is made parallel.

  A pressing roller 44 is provided downstream of the rotating roller 36 in the transport direction. The rotating roller 36 and the pressing roller 44 support the film 12 in a section from the rotating roller 36 to the pressing roller 44 in a state parallel to the upper surface of the container 11 and in contact with the upper surface of the container 11. The Thereby, when the container 11 is conveyed through the section from the rotating roller 36 to the pressing roller 44, the film 12 is pressed against the upper surface of the container 11 by the rotating roller 36 and the pressing roller 44. As shown in FIG. 2, the pressing roller 44 is provided inside the gas box 24. More specifically, the pressing roller 44 is provided in the gas box 24 near the end on the upstream side in the transport direction.

  Inside the gas box 24, a cylindrical gas ejection pipe 42 is provided on the downstream side of the pressing roller 44 in the transport direction. A pressing roller 45 is provided further downstream in the transport direction than the gas ejection pipe 42. As shown in FIG. 2, the pressing roller 45 is provided in the gas box 24 near the end on the downstream side in the transport direction. The pressing roller 45 is paired with the upstream pressing roller 44, and has the same diameter and the same size as the pressing roller 44. The pressing roller 45 is provided at the same height as the pressing roller 44. A gas ejection pipe 42 is provided at a position spaced upward from an intermediate position between the pressing roller 44 and the pressing roller 45.

  In this embodiment, the film 12 supported in parallel by the rotating roller 36 and the pressing roller 44 is lifted from the pressing roller 44 to the upper side of the gas ejection pipe 42 inside the gas box 24 and then pulled down to the pressing roller 45 again. It is done. In other words, the gas ejection pipe 42 supports the film 12 in the pressing rollers 44 and 45 at a position spaced upward from the upper surface of the container 11. The film 12 is folded back to the outside of the gas box by the pressing roller 45 and is again in a state parallel to the upper surface of the container 11. A rotation roller 37 similar to the rotation roller 36 is provided near the outlet 33 </ b> B of the processing space 33. The film 12 is supported in a position parallel to the upper surface of the container 11 and in contact with the upper surface of the container 11 in the section from the pressing roller 45 to the rotating roller 37. On the downstream side in the transport direction from the rotating roller 37, the film 12 is supported by the sheet winding unit 32 after being folded upward by the rotating roller 37. An output shaft of a motor (not shown) is connected to the roller shaft 32A of the sheet winding unit 32. When the motor is driven to rotate, the sheet winding unit 32 is rotated. As a result, the film 12 is drawn out from the sheet supply unit 31 and supplied into the processing space 33, and the film 12 is taken up by the sheet take-up unit 32.

  A rotating roller (not shown) is provided at the upper end of the gas ejection pipe 42 in order to facilitate the movement of the film 12 on the upper side of the gas ejection pipe 42. For this reason, when the film 12 moves on the upper side of the gas ejection pipe 42, it can move with low friction.

  The gas box 24 fills the container 11 with the mixed gas, and is generally formed in a hollow box shape that is long in the depth direction (direction perpendicular to the paper surface of FIG. 2). In the lower part of the gas box 24, insertion ports 39 and 40 through which the container 11 and the film 12 are inserted in the transport direction are provided. The insertion ports 39 and 40 are formed at both ends in the transport direction of the belt conveyor 22 so that the container 11 can pass through the gas box 24.

  As shown in FIG. 3, the gas ejection pipe 42 extends in a direction parallel to the upper surface of the belt 22 </ b> C and perpendicular to the conveying direction of the container 11 inside the gas box 24. One end (the upper end in FIG. 3A) in the longitudinal direction of the gas ejection pipe 42 is closed, and the other end (the lower end in FIG. 3A) is on the side wall of the gas box 24. It communicates with a gas supply port 41 which will be described later. Further, as shown in FIG. 3B, a plurality of nozzle holes 43 are provided at the lower end of the gas ejection pipe 42.

  As shown in FIGS. 3A and 3B, a gas supply port 41 is provided on the side wall of the gas box 24. The gas supply port 41 is connected to a gas tube led out from a gas tank (not shown) that stores the mixed gas. While the manufacturing apparatus 20 is in operation, the mixed gas is continuously supplied from the gas tank through the gas tube to the gas ejection pipe 42 from the gas supply port 41. The mixed gas supplied to the gas jet pipe 42 is jetted downward from the nozzle hole 43 and supplied into the gas box 24. The nozzle holes 43 are intensively provided at positions facing the container 11 so that the mixed gas can be efficiently supplied to the container 11 transported into the gas box 24. For this reason, the mixed gas ejected from the nozzle hole 43 and supplied to the inside of the gas box 24 reaches every corner inside the container 11, thereby filling the inside of the container 11 with the mixed gas. The existing gas expelled from the container 11 is discharged from the insertion ports 39 and 40 so as to be pushed out. The gas ejection pipe 42 and the nozzle hole 43 are an example of the supply means of the present invention.

  In the present embodiment, as shown in FIG. 3B, the upstream end of the upper surface of the container 11 in the conveying direction is applied by the pressing roller 44 in a state where the container 11 is disposed below the gas ejection pipe 42. The end on the downstream side in the transport direction is in contact with the pressing roller 45. In this state, the mixed gas is supplied from the nozzle hole 43 into the space surrounded by the film 12 and the upper surface of the container 11. For this reason, the existing gas in the container 11 is replaced with a mixed gas at a high replacement rate, specifically, a replacement rate of 95% to 99%. Furthermore, since the upper surface of the container 11 that has passed through the pressing roller 45 is pressed by the film 12, the welding press devices 26 and 27 on the downstream side in the conveying direction while maintaining a high replacement rate (see FIG. 2). It is conveyed to.

  As shown in FIG. 2, welding press devices 26 and 27 are provided downstream of the gas box 24 in the transport direction. The welding presses 26 and 27 are arranged along the conveying direction of the container 11. A plurality of welding press devices 26 and 27 are provided in the depth direction (direction perpendicular to the paper surface of FIG. 2). The welding press devices 26 and 27 press the film 12 against the upper end of the container 11 that has passed through the gas box 24 to weld the film 12 to the periphery of the opening at the upper end of the container 11. When the position sensor (not shown) detects that the container 11 has reached the pressing position by the welding press device 26, the welding press device 26 is driven downward to weld the film 12 to the upper end of the container 11. When the container 11 is further transported and it is detected that the container 11 has reached the pressing position by the welding press device 27, the welding press device 27 is driven downward to weld the film 12 to the upper end of the container 11. To do. In the present embodiment, the film 12 is welded at different positions by performing welding twice by the welding presses 26 and 27. Specifically, when an annular welded portion is formed at the upper end of the container 11 by the welding press 26, another annular welded portion is formed by the welding press 26 at a position having a minute gap outside the welded portion. The In this way, by forming the double welded portion, the degree of sealing by the film 12 can be increased. By welding the film 12 in this manner, the container 11 is sealed with the film 12 while the processed food is stored in the container 11 and the mixed gas is filled therein. Note that after the film 12 is welded, the welding press devices 26 and 27 are moved upward to prepare for the next operation.

  In the present embodiment, in the gas box 24, the mixed gas is filled into the container 11 to every corner, and then the film 12 is welded to the container 11 immediately after passing through the gas box 24. For this reason, the inside of the container 11 is sealed with the mixed gas at a substitution rate of 95% or more and 99% or less.

  A film punching device 28 is provided downstream of the welding press device 27 in the transport direction. The film punching device 28 cuts the film 12 welded to the container 11 by the welding press devices 26 and 27 so as to punch along the upper end of the container 11. A plurality of film punching devices 28 are provided in the depth direction (direction perpendicular to the paper surface of FIG. 2) (see FIG. 3A). When it is detected by a position sensor (not shown) that the container 11 has reached the punching position, the film punching device 28 is driven downward to punch the film 12. After the film 12 is punched, the film punching device 28 is moved upward to prepare for the next operation.

  The packaged food 10 according to the embodiment of the present invention is manufactured by the manufacturing apparatus 20 configured as described above. The packaged food 10 manufactured by the manufacturing apparatus 20 enables the processed food 13 to be stored for a long period of time. In other words, the manufacturing apparatus 20 realizes a storage method capable of storing the processed food 13 for a long period of time. Specifically, the processed food 13 is stored in a container 11 having a gas barrier property, and the replacement rate is 95%. A storage method is realized in which the mixed gas is filled in the container 11 so as to be 99% or less and the container 11 is sealed with the film 12. By manufacturing such packaged food 10, oxidation of the processed food 13 can be prevented without adding food additives such as antioxidants. Moreover, according to the manufacturing apparatus 20, since the substitution rate of the mixed gas is 95% or more and 99% or less, some oxygen (volume concentration: 0.2% to 1.0%) exists in the packaged food 10. Will do. For this reason, an increase in Clostridium botulinum that grows in an oxygen-free environment can be suppressed. In addition, since the Clostridium botulinum produces a highly toxic botulinum toxin (neurotoxin) in an anoxic state (specifically, an oxygen concentration of 0.05% or less), the production apparatus 20 of the present embodiment does not generate botulinum toxin. Therefore, 0.2% to 1.0% oxygen by volume concentration is enclosed in the packaged food 10. Thereby, the highly safe packaged food 10 can be provided. Moreover, since microorganisms and fungi can be sterilized with an appropriate alcohol, the processed food 13 can be used for a long period of time without deteriorating the flavor, texture, color, etc. of the processed food 13 and reducing the freshness of the processed food 13. It can be saved.

Example 1
A square tray (container) made of polyethylene terephthalate (PET) resin having a thickness of 0.25 to 0.3 μm, a width of 110 mm, a length of 180 mm, and a depth of 15 mm is prepared. % And a moisture concentration of 80% in an appropriate amount (hereinafter referred to as “first specimen”) were stored, and the packaged food A1 was manufactured by the manufacturing apparatus 20. At this time, the replacement ratio of the mixed gas was 97%. When the packaged food A1 was refrigerated at a constant temperature of 10 ° C. and subjected to microbial and sensory tests, the results shown in Table 1 were obtained. According to Table 1, the number of general viable bacteria contained in the first sample at the start of measurement immediately after production is 2.2 × 103 / g, E. coli test is negative, smell is good, appearance is good, taste is good Met. The microorganism test and sensory test were continued for 10 days from the first day of measurement, but the test result after 10 days was the same as the test result on the first day.

(Comparative Example 1)
A packaged food C1 in which the first specimen was stored in the rectangular tray and the upper surface opening of the rectangular tray was fitted with a lid was produced. The packaged food C1 is not filled with the mixed gas. When the packaged food C1 was refrigerated at a constant temperature of 10 ° C. and subjected to microbial and sensory tests, the results shown in Table 2 were obtained. According to Table 2, the number of individuals of general viable bacteria contained in the first sample at the start of measurement immediately after production is 2.2 × 103 / g, E. coli test is negative, smell is good, appearance evaluation is good, taste evaluation Was good. Microbial and sensory tests were continued for 10 days from the first day of measurement. The number of general viable bacteria continued to increase from the day after the first day of measurement, and increased to 8.8 × 10 7 cells / g on the 9th day. The E. coli test was always negative during the measurement period. Among the sensory tests, the smell had a slight odor on the 8th day, and a rotting odor occurred on the 9th day. The appearance was discolored after the 8th day. About taste, it was judged that it cannot eat after the 8th day.

(result)
As is clear from comparison between Example 1 and Comparative Example 1, the packaged food A1 of Example 1 can store the first specimen for a long period of time while maintaining freshness, compared to the packaged food C1 of Comparative Example 1. There was found.

(Example 2)
An appropriate amount of dried shirasu (hereinafter referred to as “second specimen”) having a salt concentration of 3.20% and a moisture concentration of 60% was stored in the rectangular tray, and the packaged food A2 was manufactured by the manufacturing apparatus 20. At this time, the replacement ratio of the mixed gas was 98%. When the packaged food A2 was refrigerated at a constant temperature of 10 ° C. and subjected to microbial and sensory tests, the results shown in Table 3 were obtained. According to Table 3, the number of general viable bacteria contained in the second sample at the start of measurement immediately after production is 3.5 × 10 3 / g, E. coli test is negative, smell is good, appearance is good, taste is good Met. Microbial and sensory tests were continued for 18 days from the first day of measurement. The number of general viable bacteria increased slightly the day after the first day of measurement, but did not increase significantly until the 14th day. From the 15th day onward, the number of general viable bacteria continued to increase, and on the 17th day, it increased to 9.2 × 10 6 cells / g. In addition, the other 18 day test results were the same as the first day test results.

(Comparative Example 2)
Packaged food C2 was produced in which the second specimen was stored in the rectangular tray and the upper surface opening of the rectangular tray was fitted with a lid. The packaged food C2 is not filled with the mixed gas. When the packaged food C2 was refrigerated at a constant temperature of 10 ° C. and subjected to microbial and sensory tests, the results shown in Table 4 were obtained. According to Table 4, the number of general viable bacteria contained in the second sample at the start of measurement immediately after production is 3.5 × 10 3 / g, E. coli test is negative, smell is good, appearance evaluation is good, taste evaluation Was good. Microbial and sensory tests were continued for 10 days from the first day of measurement. The number of general viable bacteria continued to increase from the day after the first day of measurement, and increased to 6.3 × 10 7 cells / g on the 9th day. The E. coli test was always negative during the measurement period. Among the sensory tests, the smell had a slight odor on the 8th day, and a rotting odor occurred on the 9th day. The appearance was discolored after the 8th day. About taste, it was judged that it cannot eat after the 8th day.

(result)
As is clear from comparison between Example 2 and Comparative Example 2, the packaged food A2 of Example 2 can store the second specimen for a long period of time while maintaining freshness, compared to the packaged food C2 of Comparative Example 2. There was found.

(Example 3)
Appropriate amounts of crepe (hereinafter referred to as “third specimen”) having a salt concentration of 4.40% and a moisture concentration of 52% were stored in the rectangular tray, and the packaged food A3 was manufactured by the manufacturing apparatus 20. At this time, the replacement ratio of the mixed gas was 96%. When the packaged food A3 was refrigerated at a constant temperature of 10 ° C. and subjected to microbial and sensory tests, the results shown in Table 5 were obtained. According to Table 5, the number of general viable bacteria contained in the third sample at the start of measurement immediately after production is 9.4 × 103 / g, E. coli test is negative, smell is good, appearance is good, taste is good Met. Microbiological and sensory tests were continued for 38 days from the first day of measurement. The day after the first day of the measurement, the number of viable bacteria increased slightly, then increased gradually, and increased to 5.6 × 10 6 cells / g on the 38th day. The E. coli test always showed negative results during the measurement period. The odor and taste were always good during the measurement period, but the appearance was slightly discolored on the 35th day.

(Comparative Example 3)
The third sample was stored in the rectangular tray, and a packaged food C3 in which the upper surface opening of the rectangular tray was fitted with a lid was manufactured. The packaged food C3 is not filled with the mixed gas. When the packaged food C3 was refrigerated at a constant temperature of 10 ° C. and subjected to microbial and sensory tests, the results shown in Table 6 were obtained. According to Table 6, the number of general viable bacteria contained in the third sample at the start of measurement immediately after production is 9.4 × 10 3 / g, E. coli test is negative, smell is good, appearance evaluation is good, taste evaluation Was good. Microbial and sensory tests were continued for 14 days from the first day of measurement. From the day after the first day of measurement, the number of general viable bacteria continued to increase, and on the 13th day, the number increased to 1.5 × 10 7 cells / g. The E. coli test was always negative during the measurement period. Among the sensory tests, the smell was slightly steamed on the 12th day, and a rot odor was produced after the 13th. The appearance was discolored after the 12th day. About taste, it was judged that it cannot eat after the 12th day.

(result)
As is clear from comparison between Example 3 and Comparative Example 3, the packaged food A3 of Example 3 can store the third specimen for a long period of time while maintaining freshness, compared to the packaged food C3 of Comparative Example 3. There was found.

10: Packaged food 11: Container 12: Film 13: Processed food 20: Manufacturing device 24: Gas box

Claims (6)

Processed food obtained by processing fry is stored in a container with gas barrier properties, and it contains 50 wt% nitrogen gas, 47.5 wt% carbon dioxide gas, and 2.5 wt% ethyl alcohol in mass% concentration. In order to suppress the increase of Clostridium botulinum while enabling long-term storage of the processed food, gas is contained in the container so that 0.2% to 1.0% oxygen is present in the container. The packaged food is characterized in that the container is filled and sealed at a replacement rate of 95% to 99% with respect to the existing gas .   The packaged food according to claim 1, wherein the replacement rate is 97% when the processed food is koji fried shirasu with a salt concentration of 2.80% and a moisture concentration of 80%.   The packaged food according to claim 1, wherein the replacement rate is 98% when the processed food is dried shirasu with a salt concentration of 3.20% and a moisture concentration of 60%.   The packaged food according to claim 1, wherein when the processed food is squeezed with a salt concentration of 4.40% and a moisture concentration of 52%, the replacement rate is 96%. Transport means for transporting a gas barrier container containing processed food;
An accommodating portion for accommodating the container conveyed by the conveying means;
A mixed gas containing an inert gas, a carbon dioxide gas, and an alcohol having a mass% concentration of 1.0 wt% to 5.0 wt% is supplied to the housing portion during the transfer by the transfer means, and the inside of the container is mixed with the mixed gas Gas supply means for filling with,
Sealing means for joining and sealing the periphery of the upper surface opening of the container discharged from the housing part with a film member;
A pair of pressing rollers provided at both ends in the conveying direction by the conveying means in the accommodating portion, and pressing the film member on the upper surface of the container ,
The gas supply means has a pipe that supports the film member between the pair of pressing rollers at a position spaced upward from the container, and the pipe forms the mixed gas supplied from the outside in the pipe. A device for producing packaged food that is ejected from the nozzle hole formed toward the container . Processed food obtained by processing fry is stored in a container with gas barrier properties, and it contains 50 wt% nitrogen gas, 47.5 wt% carbon dioxide gas, and 2.5 wt% ethyl alcohol in mass% concentration. In order to suppress the increase of Clostridium botulinum while enabling long-term storage of the processed food , gas is contained in the container so that 0.2% to 1.0% oxygen is present in the container. A method for preserving processed food, comprising filling the container with a replacement ratio of 95% to 99% of the existing gas and sealing the container.