JP3117556B2 - Edamame package - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a package for maintaining freshness of green soybeans by maintaining respiration under an appropriate oxygen atmosphere even after green soybeans are packaged in a synthetic resin film packaging bag. It is about. More specifically, the present invention relates to a package that maintains an oxygen atmosphere that does not allow anaerobic respiration in a low oxygen state caused by the respiratory action of green soybeans, and that maintains conditions that suppress deterioration in quality due to oxidation by oxygen. It is.

[0002]

2. Description of the Related Art Green soybeans maintain their respiratory action even after being harvested. For this reason, it is necessary to prevent deterioration of the quality of green soybeans during storage and distribution after harvest and until eating. In addition, edamame is produced in a conventional manner in summer and in a greenhouse in winter. Edamame is, by its very nature,
The quality is reduced quickly, and a polypropylene-based hermetic package is used to maintain freshness. What is sealed, green soybeans are packaged and then exposed to an oxygen-free atmosphere,
I have been forced to anaerobic breathing,
The sugar content in green soybeans is digested by this anaerobic respiration, and most of the odors give off odor when the bag is opened due to the generation of alcohol and aldehyde.

[0003] Further, regarding plant materials such as general vegetables,
As a method for supplying oxygen and maintaining freshness, a method using a perforated film has been proposed (JP-A-62-148247,
JP-A-63-119647 discloses that these films have an extremely large aperture area ratio of 2 × 10 ^-2 to 2 × 10%.
Even if the film is wrapped with these films, the oxygen in the bag is almost the same as the atmospheric state, which is the same as the open state. It has been considered that green soybeans may be wrapped using such a film.However, these close-to-open packagings are equivalent to the amount of oxygen in the air. Has a problem in that the respiratory action becomes active, green soybeans grow further, sugar is consumed, the taste is reduced, and furthermore, there is a problem that water is easily lost due to evaporation of water. Therefore, a packaging material and a packaging method that leave the original taste of green soybeans and can be served on a table while maintaining a fresh state have not been discovered yet.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to form a desirable oxygen concentration atmosphere for maintaining the freshness of green soybeans for a long period of time, and to supply products which do not generate off-flavors, have low sugar content, and are not wilted. Is the result of intensive research,
By supplying the minimum amount of oxygen necessary for the survival of green soybeans, and keeping the green soybeans in a hibernating state, the green soybeans that supply high freshness green soybeans while suppressing the decrease in sugar content and browning which are obstacles to high oxygen content Another object of the present invention is to provide a packaging bag for soybeans and a package containing green soybean.

[0005]

SUMMARY OF THE INVENTION The present invention provides a green soybean-containing package made of a perforated synthetic resin film in which green soybeans are sealed, wherein the perforated synthetic resin film has an open area ratio of 1 × 10 ^−5.
A to 1 × 10 ^-4%, a green soybeans containing packaging material, wherein the bag surface area per soybeans 100g is 200-600 ^2, in particular, an average pore diameter of the pores is 20μ
It is preferable that the number of holes is plural per packaging bag.

As the perforated film used in the present invention, any film can be used as long as it can be used for packaging green soybeans. Vinyl chloride, etc. are used, but other films such as polyamide, polyester, polycarbonate, etc.
Further, these composite films may be used. Further, even if these films are provided with a sealant layer on the surface thereof, or films which have been subjected to anti-fog treatment, there is no problem. The thickness of these films is usually 20 to 40.
μ is used. Further, these films may be transparent or opaque, and there is no problem even if the film is printed on the surface.

A packaging bag using the perforated film of the present invention is:
The open area ratio is determined by the amount of green soybeans to be packaged, and the open area ratio needs to be 1 × 10 ⁻⁵ to 1 × 10 ⁻⁴ %. The reason for this is to maintain the oxygen content and the carbon dioxide content in the packaging bag under conditions suitable for maintaining the freshness of green soybeans. According to the experimental results of the present inventors, the oxygen concentration was 3% or more and 15% or less. Desirably, the opening area ratio for satisfying these conditions is 1 × 10 ⁻⁵ to 1 × 10 ⁻⁴ %. If the open area ratio is 1 × 10 ⁻⁵ % or less, the green soybeans become anoxic during the distribution process due to the respiratory action after packaging and start anaerobic respiration, generating an odor. On the other hand, if the open area ratio is 1 × 10 ⁻⁴ % or more, the amount of oxygen in the packaging bag becomes too large, and is affected by this oxygen, causing browning of green soybeans. In addition, the respiration of green soybeans is activated, and there is a problem that green soybeans grow more than necessary and sugar is consumed. Thus as the opening area ratio of the perforated film used as a packaging bag soybeans must be from ^{1 × 10 -5 ~1 × 10 -4} %, preferably 2 × 10 ^-6 ~8 × 10 ^- It is more effective that it is in the range of ⁵ %, particularly desirably 3 × 10 ^{−5 to} 6 × 10 ⁻⁵ .

It is desirable that the average diameter of the holes in the perforated film is as small as possible.
It is about 150μ, preferably 30-100μ. It is desirable that the pore diameter is as small as possible, but if it is 20 μm or less, the productivity of the perforated film is reduced. In addition, the average pore diameter is 1
If it is 50 μm or more, the number of holes required to obtain an appropriate opening area ratio decreases, and the quality accuracy of maintaining freshness becomes uneasy. Also, the shape of the hole, such as a circle, square or triangle,
Any shape may be used, and the average diameter in the major axis direction is 1
There is no problem if it is 50 μm or less, but a circular shape is preferable from the viewpoint of hole opening workability and the like.

The number of holes per bag of the perforated film used for the green soybean packaging bag is calculated from the ratio of the opening area and the average hole diameter. Holes may be blocked due to adhesion of contents or external conditions such as the attachment of a price list. To ensure freshness, a plurality of holes are preferable, and more than 5 holes per bag, It is desirable that the degree of influence per hole be 20% or less. In addition, three-sided seal bags,
A bag in the form of a four-sided seal bag or a gusset bag may be used without any problem. Further, a tray, a cup, or the like may be filled with green soybeans and then packed in a packaging bag.

[0010] The size of edamame for packaging bags should bag surface area per Edamame 100g is 200~600cm ^2, preferably 300~500cm ^2. The reason for defining the inner surface area of the bag is to prevent the sealing portion, that is, the binding margin from being included in the calculation. Edamame 100g
When the surface area per bag is less than 300 cm ² , the density of green soybeans in the bag becomes high, and the green soybeans are damaged by contact between the green soybeans and easily brown, and the anaerobic respiration due to the lack of oxygen at the opening area ratio described above. And it is not preferable. In addition, green soybeans 10
When the surface area in the bag per 0 g is 600 cm ² or more, the density of green soybeans in the bag becomes low, the initial oxygen amount in the bag is large, the oxygen supply amount is large in the opening area ratio, and the respiration of green soybeans increases. It becomes active and browns easily, and the sugar content of the beans is depleted. In addition, the cost of the bag increases due to the large amount of the film used.

It is to be noted that, although not limited to green soybean packaging,
To maintain the freshness of vegetables, of course, the distribution process and temperature control in stores are important points, and the respiration of edamame naturally depends on these temperatures, and as these temperatures increase, the respiration increases However, the present invention assumes that these temperatures are 3 to 20 ° C.

[0012]

【Example】

<< Example 1 >> 150 mm × 200 mm in inner size, thickness 2
200 g of green soybeans were filled into a three-side sealed bag in which 11 holes having an average hole diameter of 80 μ were opened in a packaging bag made of ⁵ μm stretched polypropylene so that the open area ratio was 9.2 × 10 ⁻⁵ % (in the bag). Surface area is 150 × 200 × 2 = 60000mm
² , the surface area in the bag per 100 g of green soybean is 30
(It is 00 mm ^2, that is, 300 cm ² ). It was stored at 5 ° C., and after 3 days and 7 days, the state of odor generation, browning and greening were observed, and the results are shown in Table 1.

Example 2 A packaging bag having the same size as that of Example 1 is made of a stretched polypropylene having a thickness of 25 μm, and has an average pore diameter of 4 so that the open area ratio is 1.1 × 10 ⁻⁵ %.
Table 1 shows the results of examining the freshness after 3 days and 7 days in the same manner as in Example 1 by filling 200 g of the same green soybean as used in Example 1 using a packaging bag having five 0 μ holes.

Example 3 A packaging bag having the same size as that of Example 1 is made of a stretched polypropylene having a thickness of 25 μm and has an average pore diameter of 6 so that the open area ratio is 3.3 × 10 ⁻⁵ %.
Using a packaging bag having seven 0 μm holes, 200 g of green soybeans similar to that used in Example 1 was filled, and freshness after 3 days and 7 days was examined in the same manner as in Example 1. Table 1 shows the results.

<< Comparative Example 1 >> Inner size is 150 mm × 200 m
A non-porous packaging bag made of unstretched polypropylene having a thickness of 25 μm and 200 μm was filled with 200 g of the same green soybean as used in Example 1, and the freshness after 3 days and 7 days was examined in the same manner as in Example 1. It is shown in Table 1.

Comparative Example 2 A packaging bag having the same size as that of Example 1 is made of a stretched polypropylene having a thickness of 25 μm and has an average pore diameter of 2 so that the open area ratio is 5.2 × 10 ⁻⁶ %.
Using a packaging bag having one 0 μm hole, 200 g of green soybeans similar to that used in Example 1 was filled, and the freshness after 3 days and 7 days was examined in the same manner as in Example 1. Table 1 shows the results.

Comparative Example 3 A non-stretched polypropylene having a thickness of 25 μ similar to that in Example 1 was used, and the ratio of the open area was 5.2 ×.
The same green soybean as used in Example 1 was used in a packaging bag in which 40 holes having an average pore diameter of 100 μ were opened so as to be 10 ⁻⁴ %.
Table 1 shows the results of examining the freshness after 3 days and 7 days as in Example 1.

[0018]

[Table 1]

[0019]

By using the packaging bag of the present invention, the odor generated by anaerobic respiration of green soybeans is prevented, and the digestion of sugar by anaerobic respiration is prevented, while browning and greening due to excessive oxygen are prevented. It can be stored for a long time while keeping the freshness of green soybeans.

Claims (5)

(57) [Claims] 1. A package containing green soybeans comprising a perforated synthetic resin film in which green soybeans are sealed, wherein the perforated synthetic resin film has an open area ratio of 1 × 10 ⁻⁵ to 1 × 10 ⁻⁴ % and 100 g of green soybeans 200-600cm ^{2 in the} bag inside surface area
A package containing green soybeans, characterized in that: 2. The package containing green soybeans according to claim 1, wherein the pores of the perforated synthetic resin film have an average pore diameter of 20 to 150 μm. 3. The package containing green soybeans according to claim 1, wherein the number of the holes in one package is plural. 4. The method according to claim 1, wherein the opening area ratio is 2 × 10 ⁻⁵ to 8 × 1.
0 ^-5% is claimed in claim 1, 2 or 3 green soybeans containing packaging body according. 5. The bag has a surface area of 30 per 100 g of green soybeans.
Soybeans containing packaging material according to claim 1, 2, 3 or 4 wherein the 0~500cm ^2.