JP2017190144A - Package containing bean sprout, and method for retaining freshness of bean sprout - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging technique capable of retaining the freshness of bean sprouts for an extended period while keeping the exterior appearance of a package.SOLUTION: A package containing bean sprouts holds bean sprouts in an internal space of a packaging bag made of a synthetic resin film in a deaerated state. An amount of oxygen permeation per 100 g of bean sprouts at 23°C and 60%RH of the package containing bean sprouts is 47 cc/100 g day atm or more, and 364 cc/100 g day atm or less. When the amount of oxygen permeation per 100 g of bean sprouts at 23°C and 60%RH of the package containing bean sprouts is To, and an amount of carbon dioxide permeation per 100 g of bean sprouts at 23°C and 60%RH of the package containing bean sprouts is Tc, the relation of Tc≥To is satisfied.SELECTED DRAWING: None

Description

  The present invention relates to a bean sprouts package and a method for maintaining the freshness of bean sprouts.

  The sprouts after harvesting are generally distributed in the market in a degassed package in a packaging bag made of a synthetic resin film (Patent Document 1, etc.).

  Moreover, various reports have been made so far for the synthetic resin film constituting the packaging bag described above from the viewpoint of maintaining the freshness of bean sprouts for a long period of time.

  For example, Patent Document 2 uses a film in which an easy heat-sealable resin layer containing zinc oxide fine particles and stretched in at least one axial direction is laminated on one side of a biaxially stretched polypropylene base layer. A technique for packaging bean sprouts is disclosed.

JP 2000-289712 A JP 2003-25524 A

  However, when a package made by degassing and wrapping the bean sprouts in the conventional method is stored, the packaged body slightly swells over time after the bean sprouts are packaged, and the packaged bean sprouts discolor (brown). Inconveniences such as generation of a strange odor from the packaged bean sprouts may occur.

  Based on the above, the present invention provides a packaging technique capable of maintaining the freshness of bean sprouts for a long time while maintaining the appearance of the package.

According to the present invention, a bean-filled package in which sprouts are accommodated in the internal space of the packaging bag made of a synthetic resin film in a deaerated state,
The oxygen-permeable amount per 100 g of bean sprouts at 23 ° C. and 60% RH of the bean sprouts packaged is 47 cc / 100 g · day · atm to 364 cc / 100 g · day · atm,
When the oxygen permeation amount per 100 g of bean sprouts at 23 ° C. and 60% RH of the bean sprouts package is To, and the carbon dioxide permeation amount per 100 g of bean sprouts at 23 ° C. and 60% RH is Tc There is provided a bean sprouts package that satisfies the relation of ≧ To.

Furthermore, according to the present invention, the step of accommodating bean sprouts in the internal space of the packaging bag made of a synthetic resin film,
Obtaining a bean sprout package by sealing the packaging bag while degassing,
Including
The amount of oxygen permeation per 100 g of bean sprouts at 23 ° C. and 60% RH of the bean sprouts packaged is 47 cc / 100 g · day · atm or more and 364 cc / 100 g · day · atm or less,
When the amount of oxygen permeation per 100 g of bean sprouts at 23 ° C. and 60% RH of the bean sprouts package is To, and the amount of carbon dioxide per 100 g of bean sprouts at 23 ° C. and 60% RH of the bean sprouts is Tc , Tc ≧ To, a method for maintaining the freshness of bean sprouts is provided.

  According to the present invention, it is possible to provide a packaging technique capable of maintaining the freshness of bean sprouts for a long period while maintaining the appearance of the package.

<Packaged with bean sprout>
The bean sprouts package according to the present embodiment (hereinafter also referred to as the present package member) is a product in which bean sprouts are contained in the internal space of a packaging bag made of a synthetic resin film in a deaerated state. That is, the package is a deaerated package containing bean sprouts. This package employs a configuration that satisfies the following two conditions. Thereby, it becomes possible to maintain the freshness of bean sprouts for a long time while maintaining the appearance of the package.
The first condition is that the oxygen permeation amount per 100 g of sprouts at 23 ° C. and 60% RH of the package is 47 cc / 100 g · day · atm to 364 cc / 100 g · day · atm.
The second condition is that the oxygen permeation amount per 100 g of sprouts at 23 ° C. and 60% RH of the present packaging body is To, and the carbon dioxide permeation amount per 100 g of sprouts at 23 ° C. and 60% RH of this packaging body is Tc. When this is done, the relationship of Tc ≧ To holds.

  Here, bean sprouts continue to breathe after harvest. Therefore, during storage, distribution or preservation after harvest, sprouts themselves consume energy and cause deterioration of freshness. In general, in order to maintain the freshness of bean sprouts, the oxygen content in the package is reduced by the balance between the respiration rate of the bean sprouts and the gas permeation amount of the packaging material used for packaging the bean sprouts such as synthetic resin films, It is said that a high carbon dioxide concentration state is effective.

This package body controls the balance of bean sprouts and gas permeation performance in the package unit. Thereby, according to this package, various gas concentration conditions which exist in this package can be controlled at a high level compared with the conventional method.
Specifically, as described above, the present packaging body has a predetermined value for the oxygen transmission amount To per 100 g of bean sprouts at 23 ° C. and 60% RH, and the present packaging body has a 23 ° C., 60 ° C. The gas permeation performance was controlled so that the carbon dioxide permeation amount Tc per 100 g of bean sprout in% RH was equal to or greater than the oxygen permeation amount To per 100 g of bean sprout at 23 ° C. and 60% RH. It is. For this reason, according to this package, the following effects are acquired.
1stly, according to this package, it can prevent that a bean sprout becomes an oxygen deficiency (oxygen deficiency state), and that the gas concentration conditions in a package become excessive oxygen. Thereby, as a result, it becomes possible to stably maintain the freshness of bean sprouts for a long period of time.
2ndly, according to this package, since it can suppress that the oxygen concentration in this package increases with time progress after packaging a bean sprout, the respiration rate of this bean sprout increases. This can be suppressed. As a result, the appearance (appearance) of the package can be maintained in a good state for a long time in that the package can be prevented from swelling with the passage of time since the bean sprouts are packaged. .

  In this embodiment, the lower limit value of the oxygen permeation amount To per 100 g of bean sprouts at 23 ° C. and 60% RH of the present package is 47 cc / 100 g · day · atm or more, but preferably, the bean sprouts a bad smell From the viewpoint of suppressing this, it is 57 cc / 100 g · day · atm or more, more preferably, from the viewpoint of suppressing the appearance of the package from being changed, it is 62 cc / 100 g · day · atm or more, and more preferably From the viewpoint of maintaining a good balance between the appearance of the package and the freshness of bean sprouts, it is at least 70 cc / 100 g · day · atm, and most preferably at least 80 cc / 100 g · day · atm. Thus, when the oxygen permeation amount To per 100 g of bean sprouts of this package is controlled to be equal to or higher than the above lower limit, bean sprouts are contained in the package without oxygen deficiency (oxygen deficient state). It is possible to suppress the increase in the respiration rate with the passage of time since the bean sprouts are packaged. Therefore, when the oxygen permeation amount To per 100 g of bean sprouts of the present package is controlled to be equal to or higher than the lower limit, as a result, the freshness of bean sprouts is stably maintained for a long time while maintaining the appearance of the package. be able to.

  On the other hand, in this embodiment, the upper limit value of the oxygen permeation amount To per 100 g of sprouts at 23 ° C. and 60% RH of the present package is 364 cc / 100 g · day · atm or less, but preferably the appearance of the package Is 354 cc / 100 g · day · atm or less, more preferably 338 cc / 100 g · day · atm or less from the viewpoint of suppressing discoloration (browning) of bean sprout. More preferably, it is 260 cc / 100 g · day · atm or less from the viewpoint of maintaining a good balance between the appearance of the package and the freshness of bean sprouts. As described above, when the oxygen permeation amount To per 100 g of bean sprouts of the package is controlled to be equal to or less than the upper limit, as a result, the freshness of bean sprouts can be stably maintained for a long time while maintaining the appearance of the package. Can be maintained.

Moreover, in this package, the lower limit value of the oxygen permeation amount T1 per 100 g of sprouts at 23 ° C. and 60% RH of the synthetic resin film is preferably 600 cc / 100 g · m ² · day · atm or more, and more preferably. Is 720 cc / 100 g · m ² · day · atm or more, more preferably 880 cc / 100 g · m ² · day · atm or more, most preferably 960 cc / 100 g · m ² · day · atm or more. is there. As described above, when the oxygen permeation amount T1 per 100 g of bean sprouts of the synthetic resin film is controlled to be equal to or higher than the lower limit, the appearance of the package and the freshness of bean sprouts can be maintained in a balanced manner.

On the other hand, the upper limit value of oxygen permeation amount T1 per 100 g of sprout at 23 ° C. and 60% RH of the synthetic resin film is preferably 3500 cc / 100 g · m ² · day · atm or less, more preferably 3400 cc / 100 g. M ² · day · atm or less, more preferably 3250 cc / 100 g · m ² · day · atm or less, and most preferably 2500 cc / 100 g · m ² · day · atm or less. Thus, when the oxygen permeation amount T1 per 100 g of bean sprouts of the synthetic resin film is controlled to be equal to or less than the above upper limit value, as a result, the freshness of bean sprouts can be stably maintained for a long time while maintaining the appearance of the package. Can be maintained.

In this embodiment, the lower limit value of the oxygen permeation amount Tx at 23 ° C. and 60% RH of the synthetic resin film is preferably 1500 cc / m ² · day · atm or more, and more preferably 1800 cc / m ^2. Day · atm or more, more preferably 2200 cc / m ² · day · atm or more, particularly preferably 2400 cc / m ² · day · atm or more, most preferably 2500 cc / m ² · day.・ Atm or higher. Thus, when the oxygen permeation amount Tx of the synthetic resin film is controlled to be equal to or higher than the lower limit value, the bean sprouts in the package can be prevented from becoming oxygen deficient (oxygen deficient state). The freshness of bean sprouts can be stably maintained for a long time.

On the other hand, in this embodiment, the upper limit value of the oxygen transmission rate Tx at 23 ° C. and 60% RH of the synthetic resin film is preferably 7000 cc / m ² · day · atm or less, and more preferably 6800 cc / m ^2. It is not more than day · atm, more preferably not more than 6500 cc / m ² · day · atm, and most preferably not more than 5000 cc / m ² · day · atm. Thus, when the oxygen permeation amount Tx of the synthetic resin film is controlled to be equal to or lower than the above upper limit value, it is possible to prevent the gas concentration condition in the package from becoming excessive oxygen. It becomes possible to stably maintain the freshness of bean sprouts for a long period of time while maintaining the appearance.

Oxygen permeation amount Tx at 23 ° C. and 60% RH of the synthetic resin film described above, oxygen permeation amount T1 per 100 g of sprout at 23 ° C. and 60% RH of the synthetic resin film, and 23 ° C. and 60% RH of the package The oxygen permeation amount To per 100 g of bean sprout can be calculated by the following methods. First, an oxygen transmission rate Tx [cc / m ² · day · atm] at 23 ° C. and 60% RH of a synthetic resin film was measured using an oxygen transmission rate measuring device (Oxytran (registered trademark) OX-TRAN manufactured by MOCON). 2/21) and is measured by a method based on Annex B in JIS K7126-2. Next, a value calculated by dividing the measured value related to the oxygen permeation amount Tx [cc / m ² · day · atm] of the synthetic resin film obtained by the above-described method by the weight of the bean sprouts contained in the packaging bag. Multiply by 100. By doing so, the oxygen permeation amount T1 [cc / 100 g · m ² · day · atm] per 100 g of bean sprouts at 23 ° C. and 60% RH of the synthetic resin film according to the present embodiment can be calculated.
Next, the inner surface area [m ² ] of the package is set to the value of oxygen permeation amount T1 [cc / 100 g · m ² · day · atm] per 100 g of bean sprouts at 23 ° C. and 60% RH of the synthetic resin film described above. By multiplying, the oxygen permeation amount To [cc / 100 g · day · atm] per 100 g of bean sprouts at 23 ° C. and 60% RH can be calculated.

  In this embodiment, the lower limit value of the carbon dioxide permeation amount Tc per 100 g of bean sprouts at 23 ° C. and 60% RH of the package is preferably 78 cc / 100 g · day · atm or more, more preferably 130 cc / 100 g · day · atm or more, more preferably 156 cc / 100 g · day · atm or more. By carrying out like this, when this package is preserve | saved, it can suppress that this package is expanded. Specifically, when the carbon dioxide permeation amount Tc per 100 g of bean sprouts at 23 ° C. and 60% RH of the package is controlled to be equal to or higher than the lower limit, the gas concentration condition in the package is excessive carbon dioxide, By restricting the respiration rate of bean sprouts and maintaining the freshness of bean sprouts, it is possible to prevent the bean sprouts from generating a strange odor and swelling of the package. Thereby, as a result, the freshness of bean sprouts can be stably maintained for a long period of time.

  On the other hand, the upper limit value of the carbon dioxide permeation amount Tc per 100 g of bean sprouts at 23 ° C. and 60% RH of this package is preferably 1820 cc / 100 g · day · atm or less, more preferably 1560 cc / 100 g · day. It is atm or less, More preferably, it is 1430cc / 100g * day * atm or less, Most preferably, it is 1300cc / 100g * day * atm or less. By carrying out like this, it can suppress that discoloration (browning) arises in the sprouts accommodated in the package. Therefore, when the carbon dioxide permeation amount Tc per 100 g of bean sprouts at 23 ° C. and 60% RH of the present package is controlled to be equal to or less than the above upper limit, the gas concentration condition in the package is prevented from being excessive oxygen. Since it is possible to suppress discoloration (browning) in bean sprouts, it is possible to stably maintain the freshness of bean sprouts for a long period of time.

Moreover, in this package, the lower limit value of the carbon dioxide permeation amount T2 per 100 g of sprouts at 23 ° C. and 60% RH of the synthetic resin film is preferably 1200 cc / 100 g · m ² · day · atm or more. preferred is a ^{1246cc / 100g · m 2 · day} · atm or more, and more preferably ^{2400cc / 100g · m 2 · day} · atm or more. As described above, when the carbon dioxide permeation amount T2 per 100 g of bean sprouts of the synthetic resin film is controlled to be equal to or higher than the lower limit, the appearance of the package and the freshness of bean sprouts can be maintained in a balanced manner.

On the other hand, the upper limit value of the carbon dioxide permeation amount T2 per 100 g of sprouts at 23 ° C. and 60% RH of the synthetic resin film is preferably 17500 cc / 100 g · m ² · day · atm or less, more preferably 15000 cc / 100 g · m ² · day · atm or less, more preferably 13750 cc / 100 g · m ² · day · atm or less, and most preferably 12,500 cc / 100 g · m ² · day · atm or less. Thus, when the carbon dioxide permeation amount T2 per 100 g of bean sprouts of the synthetic resin film is controlled to be not more than the above upper limit value, as a result, the freshness of bean sprouts is stable for a long time while maintaining the appearance of the package. Can be maintained.

In this embodiment, the lower limit value of the carbon dioxide permeation amount Ty at 23 ° C. and 60% RH of the synthetic resin film is preferably 3000 cc / m ² · day · atm or more, more preferably 5000 cc / m. ² · day · atm or more, and more preferably 6000 cc / m ² · day · atm or more. As described above, when the carbon dioxide permeation amount Ty of the synthetic resin film is controlled to be equal to or higher than the lower limit value, it is possible to prevent the gas concentration condition in the package from being excessive carbon dioxide. It is possible to stably maintain the freshness of bean sprouts for a long period of time while maintaining the appearance of the body.

On the other hand, the upper limit value of the carbon dioxide permeation amount Ty at 23 ° C. and 60% RH of the synthetic resin film is preferably 35000 cc / m ² · day · atm or less, more preferably 30000 cc / m ² · day · atm. Or less, more preferably 27500 cc / m ² · day · atm or less, and most preferably 25000 cc / m ² · day · atm or less. As described above, when the carbon dioxide permeation amount Ty of the synthetic resin film is controlled to be equal to or less than the above upper limit value, it is possible to prevent the oxygen concentration in the package from increasing, and as a result, the sprout freshness is increased. It can be stably maintained for a period.

Carbon dioxide permeation amount Ty at 23 ° C. and 60% RH of the synthetic resin film described above, carbon dioxide permeation amount T2 per 100 g of sprouts at 23 ° C. and 60% RH of the synthetic resin film, and 23 ° C. and 60% of this packaging body The carbon dioxide permeation amount Tc per 100 g of bean sprout in% RH can be calculated by the following methods. First, the carbon dioxide permeation amount Ty [cc / m ² · day · atm] at 23 ° C. and 60% RH of the synthetic resin film was measured using a carbon dioxide permeability measuring device (PERMATRAN-C 4/41 manufactured by MOCON). ) And a method according to Appendix B in JIS K7126-2. Next, the weight of the bean sprouts stored in the packaging bag with respect to the carbon dioxide permeation amount Ty [cc / m ² · day · atm] at 23 ° C. and 60% RH of the synthetic resin film obtained by the above-described method. And multiply the calculated value by 100. By doing so, the carbon dioxide permeation amount T2 [cc / 100 g · m ² · day · atm] per 100 g of bean sprouts at 23 ° C. and 60% RH of the synthetic resin film according to the present embodiment can be calculated.
Next, the inner surface area [m ² ] of the package is set to the value of carbon dioxide permeation amount T2 [cc / 100 g · m ² · day · atm] per 100 g of bean sprouts at 23 ° C. and 60% RH. The carbon dioxide permeation amount Tc [cc / 100 g · day · atm] per 100 g of bean sprouts at 23 ° C. and 60% RH of the package can be calculated.

  In addition, as described above, this packaging body has an oxygen permeation amount To per 100 g of bean sprouts at 23 ° C. and 60% RH of the present packaging body, and carbon dioxide permeation per 100 g of bean sprouts at 23 ° C. and 60% RH of the present packaging body. A configuration in which a relationship of Tc ≧ To is established between the amount and Tc is preferably adopted, but preferably a relationship of 7To ≧ Tc> To is established, and more preferably, 5To ≧ Tc ≧ 2To. The relationship is established. Thereby, as a result, the external appearance of a package and the freshness of a bean sprout can be kept with sufficient balance.

  And in this embodiment, the oxygen permeation amount T1 per 100 g of bean sprouts at 23 ° C. and 60% RH of the above-mentioned synthetic resin film, and carbon dioxide per 100 g of bean sprouts at 23 ° C. and 60% RH of the above-mentioned synthetic resin film. It is preferable that a relationship of T2 ≧ T1 holds between the transmission amount T2. By doing so, it is possible to control the balance between the amount of air entering the inside of the package body from the inside and the amount of gas released from the inside of the package body to the outside of the package body. Therefore, when the relationship of T2 ≧ T1 is established, as a result, the appearance of the package and the freshness of bean sprouts can be maintained in a balanced manner. Further, in the present embodiment, it is more preferable that the relationship of 7T1 ≧ T2> T1 holds between the oxygen transmission amount T1 and the carbon dioxide transmission amount T2, and further when the relationship of 5T1 ≧ T2 ≧ 2T1 holds. preferable.

In addition, the contact angle of water with respect to the surface of the package in which bean sprouts are accommodated, that is, the contact angle of water with respect to the inner surface of the packaging bag constituting the package is preferably 3 ° or more and 60 ° or less. More preferably, it is 5 ° to 55 °, more preferably 10 ° to 50 °, and most preferably 10 ° to 30 °. By carrying out like this, it can suppress that dew condensation generate | occur | produces on the inner surface of this package by the trace amount water vapor | steam released from the bean sprouts in a package.
In addition, as a method for measuring the contact angle of water, for example, a commercially available contact angle meter such as DROPMASTER-501 manufactured by Kyowa Interface Science Co., Ltd. is used. There is a method of measuring the contact angle by a liquid suitable method.

  Further, in this package, the haze value of the synthetic resin film used for wrapping bean sprout is preferably 20% or less, more preferably 10% or less, and further preferably 6% or less. . By carrying out like this, it can be set as the packaging body excellent in appearance from a viewpoint that it is excellent in internal visibility. On the other hand, the lower limit value of the Haze value is not particularly limited and is preferably closer to 0%. In addition, the said Haze value can be measured by the method based on JIS-K-7136.

  The amount of bean sprouts contained in the package is preferably 150 g or more and 350 g or less, for example, from the viewpoint of improving consumer demand and balance of manufacturing costs.

  Next, the synthetic resin film used for packaging bean sprout will be described.

The material constituting the synthetic resin film can be used for bean sprouts packaging, and the gas permeation amount of the synthetic resin film can be controlled so as to satisfy the above two conditions. There is no limitation. Specific examples of the material constituting the synthetic resin film include polyethylene, polypropylene, polystyrene, and ethylene-vinyl acetate copolymer resin. These may be homopolymers, copolymers, or blends containing two or more of these homopolymers and copolymers. That is, the synthetic resin film in the present embodiment has a resin layer containing one or more resins selected from the group consisting of polyethylene, polypropylene, polystyrene, and ethylene-vinyl acetate copolymer resin among various resin materials. It is preferable that Moreover, in this embodiment, it is preferable that this resin layer contains an antifogging agent. By carrying out like this, it can suppress that dew condensation generate | occur | produces on the inner surface of this package by the trace amount water vapor | steam released from the bean sprouts in a package.
In the present embodiment, when the synthetic resin film has the resin layer containing the antifogging agent, the content of the antifogging agent with respect to the total amount of the resin layer balances the appearance of the package and the freshness of the bean sprouts. From the viewpoint of holding, it is preferably 0.1 wt% or more and 5 wt% or less, and more preferably 0.3 wt% or more and 2.5 wt% or less.

  In the present embodiment, as the antifogging agent, any known antifogging agent such as a fatty acid ester of a polyhydric alcohol or an ethylene oxide adduct of a higher aliphatic amine can be used. Specific examples thereof include glycerin monostearate, diglycerin laurate, decaglycerin laurate, and sorbitan stearate.

  In the present embodiment, the melting point of the resin material exemplified above constituting the synthetic resin film is preferably 75 ° C. or higher and 170 ° C. or lower, more preferably, from the viewpoint of improving the manufacturing efficiency of the package. It is 75 degreeC or more and 165 degrees C or less, More preferably, it is 85 degreeC or more and 160 degrees C or less.

  In addition, the synthetic resin film according to the present embodiment may be a stretched film or an unstretched film, but highly controls the balance between the respiration rate of sprouts and the gas permeation amount of the synthetic resin film. From the viewpoint, an unstretched film is preferable. Further, when the synthetic resin film is a stretched film, the longitudinal direction (MD direction) and the width direction (MD) of the film are used from the viewpoint of highly controlling the balance between the breathing rate of sprouts and the gas permeation amount of the synthetic resin film. Direction) is preferably subjected to a stretching treatment of 5 times or less.

  In addition, the synthetic resin film according to the present embodiment may be a single layer film formed of the above-described material, or may be a multilayer film in which a plurality of layers are laminated in the thickness direction. Here, when the synthetic resin film according to the present embodiment is the multilayer film, the film suppresses the occurrence of condensation on the inner surface of the package due to a small amount of water vapor released from the bean sprouts in the package. From the viewpoint of, it is preferable to have the resin layer containing the antifogging agent on at least one surface, and from the viewpoint of improving the production efficiency of the package, the resin layer containing the antifogging agent is provided on both sides. More preferably. In addition, when the synthetic resin film according to the present embodiment is a multilayer film having a laminated structure in which three or more layers are laminated in the thickness direction, both surfaces of the multilayer film are used for the purpose of stabilizing the anti-fogging property of the packaging bag. An antifogging agent may be contained in a layer other than the two outermost layers constituting the layer.

  The layer structure of the synthetic resin film according to the present embodiment is such that, for example, in the thickness direction of the film, the resin layer containing the antifogging agent, the intermediate layer, and the resin layer containing the antifogging agent are in this order. You may have the laminated structure of three or more layers laminated | stacked by. In this case, the intermediate layer is not limited to a single layer structure, and may be a multilayer structure in which two or more layers are stacked in the thickness direction. Further, the outermost layer of the film is not limited to the resin layer containing an antifogging agent.

  The thickness of the synthetic resin film according to the present embodiment may be, for example, 20 μm or more and 40 μm or less. If the film is too thin, the strength may be insufficient. On the other hand, if the film is too thick, the production cost increases, so the practicality decreases.

  Moreover, in order to adjust the gas permeation | transmission amount, the fine hole may be drilled in the synthetic resin film which concerns on this embodiment. However, the synthetic resin film according to the present embodiment has micropores from the viewpoint of suppressing the appearance of the packaging body from slightly changing over time after the bean sprouts are wrapped. It is preferable that it is not perforated.

  As a method for molding the synthetic resin film, techniques such as an extrusion method (T-die method, inflation method) and a calendering method can be employed. When the film is formed, additives such as an antifogging agent may be kneaded as necessary, or two or more kinds of resins may be blended. Further, the film may be stretched or annealed. These films may be provided with a sealant layer, or may be a film coated to give some function.

Here, in the present packaging body, it is particularly important that the synthetic resin film manufacturing method used for packaging bean sprouts is highly controlled for various factors relating to the following three conditions. That is, this package can be produced for the first time by using a synthetic resin film obtained by a production method that highly controls various factors relating to the following three conditions. In this package, the synthetic resin film used for wrapping bean sprouts is produced by combining other known production conditions as long as various factors relating to the following three conditions are highly controlled. be able to.
(1) Combination of resin materials used to form a synthetic resin film (2) Combination of layer structure and film forming method of synthetic resin film (3) Heat seal processing conditions of synthetic resin film

Next, the manufacturing method of this package is demonstrated.
As a manufacturing method of this package, there exist the following methods, for example.
First, a synthetic resin film produced by the method described above is prepared. Next, after the synthetic resin film is cut out to a desired size, the two films are overlapped and heat sealed in three directions using a sealer to form a 10 mm wide heat sealed portion, thereby providing a packaging bag. Is made. Next, a predetermined amount of bean sprouts is accommodated in the internal space of the packaging bag. Then, using a degassing sealer, while degassing the air present in the interior space of the packaging bag, heat sealing processing is performed on one side of the packaging bag where the heat-sealed portion has not yet been formed. A seal portion is formed to obtain the package. Moreover, in this embodiment, the deaeration method of the interior space of a packaging bag is not limited to the method using the deaeration sealer mentioned above, A well-known method is employable.

<How to maintain freshness of bean sprouts>
The method for maintaining the freshness of bean sprouts according to the present embodiment is a method for preserving bean sprouts using the above-described package. Specifically, the method for maintaining the freshness of bean sprouts according to the present embodiment includes the step of accommodating bean sprouts in the internal space of a packaging bag made of a synthetic resin film, and the book described above by sealing the packaging bag while degassing. And a step of obtaining a bean sprouts package (present package) according to the embodiment. By carrying out like this, the freshness of a bean sprout can be maintained for a long time, maintaining the external appearance of the obtained package.

  As mentioned above, although embodiment of this invention was described, these are illustrations of this invention and various structures other than the above are also employable.

  Hereinafter, although an example and a comparative example explain the present invention, the present invention is not limited to these.

Example 1
First, a linear low density polyethylene resin (Prime Polymer Co., Ltd., Evolution SP3010, melting point: 124 ° C.) and an antifogging agent master batch (Riken Vitamin Co., Ltd., Riquet Master EAR-5, antifogging agent in a ratio of 12% by weight. The resin composition used for producing a synthetic resin film was prepared. At this time, both were mixed so that the content of the linear low density polyethylene resin with respect to the total amount of the resin composition was 90% by weight, and the content of the antifogging agent masterbatch with respect to the total amount of the resin composition was 10% by weight. .
Next, the prepared resin composition was charged into an air-cooled inflation coextrusion machine (Hokushin Sangyo Co., Ltd., HM55H type), and a synthetic resin film having a thickness of 30 μm was produced by an air-cooled inflation method. The obtained film was an endless film having no seam.
Next, after cutting out the obtained synthetic resin film into a predetermined size, heat seal processing is performed on one side using an impulse sealer (manufactured by Fuji Impulse Co., Ltd., FI-400Y-10PK) to form a 10 mm wide heat seal portion. The packaging bag of Example 1 was obtained by forming.
Next, 210 g of mung bean sprouts was accommodated in the internal space of the obtained packaging bag (inner dimensions: 180 mm × 210 mm). Next, using a deaeration seal machine (V-301, manufactured by Fuji Impulse Co., Ltd.), while visually confirming that the internal space of the packaging bag is in a deaerated state, the remaining one of the packaging bag is 10 mm wide. By forming a heat-sealed portion, the bean-filled package of Example 1 was obtained. The inner surface area of the resulting bean sprouts packaged body was 7.2 × 10 ⁻² m ² .

(Example 2)
Instead of the linear low density polyethylene resin, a low density polyethylene resin (Sumitomo Chemical Co., Sumikasen F-218-0, melting point: 108 ° C.) is used, and the low density polyethylene resin and antifogging agent master batch (manufactured by Riken Vitamin Co., Ltd.) Synthetic resin film was prepared using a resin composition obtained by mixing Riquemaster EAR-5 and 12% by weight of antifogging agent), and the thickness was 40 μm. A sprout-containing package of Example 2 was obtained in the same manner as in Example 1 except that a resin film was formed. In addition, the inner surface area of the bean sprouts package of Example 2 was 7.2 × 10 ⁻² m ² . The content of the low density polyethylene resin relative to the total amount of the resin composition used for producing the synthetic resin film is 90% by weight, and the content of the antifogging agent master batch relative to the total amount of the resin composition is 10%. %Met.

(Example 3)
A high-density polyethylene resin (manufactured by Prime Polymer Co., Ltd., Hi-Zex 3300F, melting point: 132 ° C.) is used in place of the linear low-density polyethylene resin. Example 5 except that a synthetic resin film was prepared using a resin composition obtained by mixing -5 and an antifogging agent in a proportion of 12% by weight. Three bean sprouts were obtained. In addition, the inner surface area of the bean sprouts packaged in Example 3 was 7.2 × 10 ⁻² m ² . The content of the high-density polyethylene resin relative to the total amount of the resin composition used for producing the synthetic resin film is 90% by weight, and the content of the antifogging agent master batch relative to the total amount of the resin composition is 10%. %Met.

Example 4
First, polypropylene resin (manufactured by Sumitomo Chemical Co., Ltd., Nobrene FS2011DG3, melting point 1: 58 ° C.) and antifogging agent masterbatch (manufactured by Riken Vitamin Co., Ltd., Riquet Master PAR-380, containing 10% by weight of antifogging agent) The resin composition used in order to produce a synthetic resin film was prepared by mixing. At this time, both were mixed so that the content of the polypropylene resin with respect to the total amount of the resin composition was 88% by weight, and the content of the antifogging agent master batch with respect to the total amount of the resin composition was 12% by weight. Next, the prepared resin composition was put into a T-die extruder, and a synthetic resin film having a thickness of 25 μm was produced by a multi-manifold T-die method.
Next, after cutting out the obtained synthetic resin film into a predetermined size, the two films are superposed and heat-sealed in three directions using an impulse sealer (Fuji Impulse Co., Ltd., FI-400Y-10PK). The packaging bag of Example 4 was produced by forming a heat-sealed portion having a width of 10 mm.
Next, 210 g of mung bean sprouts was accommodated in the internal space of the obtained packaging bag (inner dimensions: 180 mm × 210 mm). Next, using a deaeration seal machine (V-301, manufactured by Fuji Impulse Co., Ltd.), while visually confirming that the internal space of the packaging bag is in a deaerated state, the remaining one of the packaging bag is 10 mm wide. By forming a heat-sealed portion, a bean-filled package of Example 4 was obtained. The inner surface area of the resulting bean sprouts packaged body was 7.2 × 10 ⁻² m ² .

(Example 5)
A synthetic resin film having a thickness of 25 μm having a three-layer structure in which a resin layer, an intermediate layer, and a resin layer were laminated in this order in the thickness direction was produced by the following method.
First, polypropylene resin (manufactured by Sumitomo Chemical Co., Ltd., Nobrene FS2011DG3, melting point 1: 58 ° C.) and antifogging agent masterbatch (manufactured by Riken Vitamin Co., Ltd., Riquet Master PAR-380, containing 10% by weight of antifogging agent) And a propylene-1-butene copolymer (manufactured by Mitsui Chemicals, Tuffmer (registered trademark) XM7070) were mixed to prepare a resin composition used for preparing the resin layer. At this time, the content of the polypropylene resin with respect to the total amount of the resin composition was 78% by weight, the content of the antifogging agent masterbatch with respect to the total amount of the resin composition was 12% by weight, and the propylene-1-butene content relative to the total amount of the resin composition was Each raw material component was mixed so that the content of the polymer would be 10% by weight.
Moreover, as a material used in order to form the said intermediate | middle layer, the low density polyethylene resin (The Sumitomo Chemical Co., Ltd. make, Sumikasen F-218-0) was prepared.

Next, the resin composition used for producing the resin layer and the material used for forming the intermediate layer are put into a T-die extruder and subjected to a multi-manifold T-die method (co-extrusion T-die method). A synthetic resin film having a thickness of 25 μm having a three-layer structure in which a resin layer having a thickness of 5 μm, an intermediate layer having a thickness of 15 μm, and a resin layer having a thickness of 5 μm are laminated in this order in the thickness direction was produced. .
Next, after cutting out the obtained synthetic resin film into a predetermined size, the two films are superposed and heat-sealed in three directions using an impulse sealer (Fuji Impulse Co., Ltd., FI-400Y-10PK). The packaging bag of Example 5 was produced by forming a heat-sealed portion having a width of 10 mm.
Next, 210 g of mung bean sprouts was accommodated in the internal space of the obtained packaging bag (inner dimensions: 180 mm × 210 mm). Next, using a deaeration seal machine (V-301, manufactured by Fuji Impulse Co., Ltd.), while visually confirming that the internal space of the packaging bag is in a deaerated state, the remaining one of the packaging bag is 10 mm wide. By forming a heat-sealed portion, a bean-filled package of Example 5 was obtained. The inner surface area of the resulting bean sprouts packaged body was 7.2 × 10 ⁻² m ² .

(Comparative Example 1)
An anti-fogging biaxially stretched polypropylene film (Toyobo Co., Ltd., Pyrene Film-OT: P5562) having a thickness of 25 μm was prepared as a synthetic resin film. Next, after cutting out such a synthetic resin film to a predetermined size, the two films are superposed and subjected to heat sealing processing on three sides using an impulse sealer (Fuji Impulse Corp., FI-400Y-10PK). A packaging bag of Comparative Example 1 was produced by forming a heat-sealed portion having a width of 10 mm.
Next, 210 g of mung bean sprouts was accommodated in the internal space of the obtained packaging bag (inner dimensions: 180 mm × 210 mm). Next, using a deaeration seal machine (V-301, manufactured by Fuji Impulse Co., Ltd.), while visually confirming that the internal space of the packaging bag is in a deaerated state, the remaining one of the packaging bag is 10 mm wide. By forming a heat-sealed portion, a bean-filled package of Comparative Example 1 was obtained. The inner surface area of the resulting bean sprouts packaged body was 7.2 × 10 ⁻² m ² .

The synthetic resin films of Examples 1 to 5 and Comparative Example 1 and the bean sprouts in Examples 1 to 5 and Comparative Example 1 were measured and evaluated as follows.
Each bean sprouts packaged for use in the following evaluation was stored at 30 ° C. for 3 hours and then stored at 10 ° C. for 4 days. In the following description, a bean sprout package in a state after being stored under the above-described conditions will be referred to as a bean sprout package after storage.

-Oxygen permeation amount of synthetic resin film at 23 ° C. and 60% RH: The oxygen permeation amount of the synthetic resin film is an oxygen permeation measuring device (Oxytran (registered trademark) OX-TRAN 1/50) manufactured by MOCON. Was measured by a method based on Appendix B in JIS K7126-2. The measurement conditions were set at 23 ° C. and 60% RH. The unit is cc / m ² · day · atm.

・ Carbon dioxide permeation amount at 23 ° C. and 60% RH of the synthetic resin film: The carbon dioxide permeation amount of the synthetic resin film is a carbon dioxide permeation measuring device (PERMATRAN-C 4/41) manufactured by MOCON. And it measured by the method based on the appendix B in JISK7126-2. The measurement conditions were set at 23 ° C. and 60% RH. The unit is cc / m ² · day · atm.

-Contact angle of water: About the inner surface of each obtained packaging bag, using a contact angle meter (manufactured by Kyowa Interface Science Co., Ltd., DROPMASTER-501), 7 seconds after 2 μL of purified water was deposited on the measurement surface The contact angle was measured by the droplet method, and the obtained measured values were evaluated according to the following criteria. The unit is °.
A: 10 ° or more and 30 ° or less.
(Triangle | delta): It is a value higher than 30 degrees, and was 60 degrees or less.
X: A value higher than 60 °.

  About the obtained bean sprout packaging after the preservation | save, evaluation shown below was performed. The results are shown in Table 1 below.

Appearance (swelling): The appearance of the bean sprouts after storage was visually observed, and the appearance was evaluated according to the following criteria.
A: The package was not inflated.
○: Although the package was slightly swollen, it was at a level where there was no practical problem.
X: The package was swollen.

Odor: Skilled panelists evaluated the odor of bean sprouts stored in the bean sprouts after storage according to the following criteria.
A: There was no off-flavor.
○: Slightly off-flavor was generated, but it was at a level with no practical problems.
X: Odor was generated.

-Color of bean sprout: The color of bean sprout contained in the packaged bean sprout after storage was visually observed and evaluated according to the following criteria.
A: Discoloration (browning) did not occur in bean sprouts.
○: Although slight discoloration (browning) occurred in bean sprouts, it was at a level having no practical problem.
X: Sprouts were discolored (brown).

-Condensation: The bean sprouts after storage were visually observed and evaluated according to the following criteria.
A: Condensation did not occur on the inner surface of the package, or small granular or film-like condensation occurred on the inner surface of the package, but the bean sprouts contained inside the package were clearly visible from the outside. I was able to see.
○: Mist or particulate condensation occurs on a part of the inner surface of the package, and there are places where it is difficult to visually recognize the bean sprouts contained inside the package from the outside. The bean sprouts were clearly visible from the outside (at a level that was not a problem for practical use).
X: Mist-like dew condensation has occurred on most of the inner surface of the package, and it was difficult to clearly see the bean sprouts contained inside the package from the outside.

  Each of the bean sprouts of Examples 1 to 5 can maintain the freshness of the stored bean sprouts for a long time while maintaining the appearance. On the other hand, the sprout-containing package of Comparative Example 1 did not satisfy the required level in that the appearance was changed and a strange odor was generated.

Claims (8)

A sprout-containing package in which bean sprouts are contained in the inner space of the packaging bag made of a synthetic resin film in a deaerated state,
The oxygen-permeable amount per 100 g of bean sprouts at 23 ° C. and 60% RH of the bean sprouts packaged is 47 cc / 100 g · day · atm to 364 cc / 100 g · day · atm,
When the oxygen permeation amount per 100 g of bean sprouts at 23 ° C. and 60% RH of the bean sprouts package is To, and the carbon dioxide permeation amount per 100 g of bean sprouts at 23 ° C. and 60% RH is Tc A package containing bean sprouts that satisfies the relation of ≧ To.   The bean sprouts packaging according to claim 1, wherein the amount of carbon dioxide per 100g bean sprouts at 23 ° C and 60% RH is 78 cc / 100g · day · atm to 1820cc / 100g · day · atm. body.   The bean-filled package according to claim 1 or 2, wherein a contact angle of water with respect to the inner surface of the packaging bag is 3 ° or more and 60 ° or less.   The said synthetic resin film has a resin layer containing 1 or more types of resin selected from the group which consists of polyethylene, a polypropylene, a polystyrene, and ethylene-vinyl acetate copolymer resin, It is any one of Claim 1 thru | or 3. No sprouts packaging.   The packaged bean sprouts according to claim 4, wherein the resin layer further contains an antifogging agent.   The packaged bean sprouts according to claim 4 or 5, wherein the resin has a melting point of 75 ° C or higher and 170 ° C or lower.   The packaged bean sprouts according to any one of claims 1 to 6, wherein the synthetic resin film is an unstretched film. A step of accommodating sprouts in the internal space of the packaging bag made of a synthetic resin film;
Obtaining a bean sprout package by sealing the packaging bag while degassing,
Including
The amount of oxygen permeation per 100 g of bean sprouts at 23 ° C. and 60% RH of the bean sprouts packaged is 47 cc / 100 g · day · atm or more and 364 cc / 100 g · day · atm or less,
When the amount of oxygen permeation per 100 g of bean sprouts at 23 ° C. and 60% RH of the bean sprouts package is To, and the amount of carbon dioxide per 100 g of bean sprouts at 23 ° C. and 60% RH of the bean sprouts is Tc , Tc ≧ To, a bean sprouts freshness maintaining method characterized in that