JPH07184538A - Packed body housing green soybean - Google Patents

Abstract

PURPOSE:To obtain the subject packed body capable of preventing from odor due to anaerobic respiration and browning or greening due to excess oxygen over a long period and enabling safe heating treatment in heating. CONSTITUTION:In a packed bag housing green soybeans, consisting of a perforated synthetic resin film in which green soybeans are hermetically sealed, opened area ratio of the perforated synthetic resin film is 1X10<-6> to 1X10<-4>% and a seal strength in a small part of the sealed part of the bag made of the perforated synthetic resin film is smaller than the seal strength of other large part of sealed part and surface area of the bag is 200-600cm<2> based on 100g green soybeans.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a package for keeping freshness by continuing the breathing action of edamame in an appropriate oxygen atmosphere even after the edamame is packaged in a synthetic resin film packaging bag. It is about. More specifically, while maintaining an oxygen atmosphere that does not anaerobically breathe in the low oxygen state due to the respiratory action of edamame, while maintaining conditions that suppress the deterioration of quality due to oxidation by oxygen, cook as it is. The present invention relates to a packaging body made possible.

[0002]

2. Description of the Related Art Green soybeans maintain their respiratory action even after being harvested. Therefore, it is necessary to prevent the quality deterioration of edamame during storage / distribution after harvest and before eating. In addition, edamame is grown in the usual manner in the summer and in the greenhouse in the winter. Edamame is, by its nature,
The quality deteriorates quickly and polypropylene-based hermetically sealed packaging is used to maintain freshness. After being packaged, green soybeans are packaged and then exposed to an oxygen-free atmosphere.
I have been forced to breathe anaerobically,
Due to the anaerobic respiration, sugars in edamame are digested, and alcohol, aldehydes, etc. are generated, so that most of them have an offensive odor when opened.

Further, regarding plant materials such as general vegetables,
A method using an apertured film has been proposed as a method of supplying oxygen and maintaining freshness (JP-A-62-148247).
JP-A-63-119647), but these films have an extremely large open 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 in the atmospheric state and is the same as in the open state. It has been considered to package edamame using such a film as well, but with packaging close to these open, the amount of oxygen in the air is equivalent, and edamame has a large amount of oxygen, so edamame Has a problem that the edible beans become active, the soybean grows further, the sugar content is consumed, the taste is deteriorated, and further, the edible soybeans easily wither due to the evaporation of water. Therefore, a packaging material and a packaging method that retain the original taste of edamame and can be served on a table while maintaining a fresh state have not yet been discovered. With the change in eating habits, the popularity of microwave ovens at home is remarkable. Even when cooked in a microwave oven, green soybeans are boiled, but until now it was necessary to make an opening to prevent the bag from bursting due to increased vapor pressure. Such an opening increased the oxygen concentration in the bag and could not maintain the freshness of edamame.

[0004]

The object of the present invention is to provide a product which forms a desirable oxygen concentration atmosphere for keeping the freshness of edamame for a long time, does not give off a strange odor, has a reduced sugar content, and has no wither, Another object of the present invention is to provide a package in which freshly boiled edamame can be eaten easily by heating in a microwave oven.

[0005]

According to the present invention, in a packaging bag containing edamame, which is made of a synthetic resin film having perforated herbs in which edamame is sealed, an open area ratio of the synthetic resin film having perforation is 1 × 10 ^−6.
˜1 × 10 ⁻⁴ %, the sealing strength of a small part of the sealing part of the packaging bag is smaller than the sealing strength of the other large sealing parts, and the surface area in the bag per 100 g of edamame is 2
A green soybeans containing packaging material, which is a 00～600Cm ^2, in particular, an average pore diameter of the pores 20μm~15
It is preferably 0 μm, and the number of the holes is preferably plural per packaging bag. Further, it is preferable that a part of the seal portion of the package is a part coat portion formed of a part coat layer by coating one side or both sides of the seal surface.

The perforated film used in the present invention is one that can be used for packaging edamame, and
Use a material that does not melt below ℃. For example, unstretched polypropylene, stretched polypropylene, polyethylene, etc. are used, but other films such as polyamide, polyester, polycarbonate, etc., and further composite films thereof may be used, and further, a sealant may be applied to the surface of these films. It does not matter whether the film is provided with a layer or an antifogging film. The thickness of these films is usually 20 to 60 μm. Furthermore, even if these films are transparent,
It does not matter if it is opaque or has a printed 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 must be 1 × 10 ⁻⁶ to 1 × 10 ⁻⁴ %. The reason for this is to keep the amount of oxygen and the amount of carbon dioxide in the packaging bag under conditions suitable for keeping the freshness of edamame. From the experimental results of the present inventors, it was found that the oxygen concentration was 3% or more and 15% or less. Desirably, the opening area ratio for satisfying these conditions is 1 × 10 ⁻⁶ to 1 × 10 ⁻⁴ %. If the open area ratio is 1 × 10 ⁻⁶ % or less, the edamame becomes anoxic during the distribution process due to the breathing action after packaging, and begins to anaerobically breathe, producing an offensive odor. Further, when the open area ratio is 1 × 10 ⁻⁴ % or more, the amount of oxygen in the packaging bag becomes too large, which causes the browning phenomenon of edamame under the influence of this oxygen, and further the amount of oxygen is large. However, the respiration of edamame is activated, and the problem arises that edamame grows more than necessary and the sugar content is exhausted. Therefore, the perforated film area ratio of the perforated film used as a packaging bag for edamame must be 1 × 10 ⁻⁶ to 1 × 10 ⁻⁴ %.

It is desirable that the average diameter of the holes in the perforated film is as small as possible.
It is about 150 μm, preferably 30 to 100 μm.
It is desirable that the pore size is as small as possible, but if it is 20 μm or less, the productivity of the perforated film is lowered. Further, if the average pore diameter is 150 μm or more, the number of pores required to obtain an appropriate open area ratio decreases, and there is concern about the quality accuracy of freshness retention. The shape of the holes may be any shape such as a circle, a square or a triangle. If the average diameter in the major axis direction is 150 μm or less, there is no problem. More desirable.

The number of holes per bag of the perforated film used for the edamame packaging bag is calculated from the open area ratio and the average hole diameter, but it is desirable to use a plurality of holes as much as possible. Since the holes may be blocked by adhesion of contents or external conditions such as attachment of price list, it is preferable to have multiple holes to ensure freshness, and more than 5 holes per bag, It is desirable that the degree of influence per hole is 20% or less. Moreover, as a packaging bag of edamame, a three-sided seal bag,
The bag may be in the form of a four-sided sealed bag, a gusset bag, or the like, and may be in the form of filling edamame into a tray, a cup, or the like, and packaging the edamame in a packaging bag.

In order to eat by heating in a microwave oven, it is preferable that the green soybeans to be used have been washed in advance and the number of bacteria on the surface has been adjusted. If the sealed bag is heated as it is, the water vapor pressure in the bag rises and the bag bursts. In the present invention, in order to adjust the water vapor pressure in the bag, the sealing strength of a part of the seal part is weakened, and when the temperature reaches a certain temperature, a part of the seal part of the bag is softened and an opening is provided. As a method of forming the opening, an adhesive having a heat resistance of 80 ° C. or less is coated on a part of the seal portion to form a part coat portion. As the adhesive to be used, considering the combination with the film material, for example, when the sealing layer is polypropylene, chlorinated polypropylene, ethylene-vinyl acetate copolymer, or a mixture of both is suitable. . One of these is applied to one side or both sides of a part of the small part of the seal part and dried to form a part coat part, and a packaging bag is prepared. The part coat part shall be provided at one or several places on the side or top (bottom) part in the case of a four-way seal, and at the top (bottom) part or a part of the dorsal fin seal part in the case of a three-way seal. The width of the part coat part is
It is preferable to make the size of the soybeans less likely to be scattered when the part coat part is opened when it is microwaved.

The size of the packaging bag for edamame must be such that the surface area inside the bag is 100 to 200 cm ² per 100 g of edamame, and preferably 300 to 500 cm ² . The inner surface area of the bag is specified so that the seal portion, that is, the binding margin is not included in the calculation. Edamame 100g
When the surface area per bag is 300 cm ² or less, the density of edamame in the bag becomes high, scratches are caused by the contact between the edamame beans, and browning is likely to occur. Oxygen deficiency is caused by the above open area ratio and anaerobic breathing occurs. It is not desirable to fall into. Furthermore, edamame 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, and the oxygen supply amount is large in the above-mentioned open area ratio, so that the respiratory action of green soybeans is increased. It becomes active and browns easily, and the sugar content of beans is exhausted. In addition, since the amount of film used is large, the cost of the bag is high.

Although not limited to the edamame packaging,
To maintain the freshness of vegetables, etc., of course, the distribution process and temperature control at the store are important points, and the respiration rate of edamame naturally depends on these temperatures, and the respiration rate increases as these temperatures increase. However, the present invention assumes these temperatures of 3 to 15 ° C.

[0013]

【Example】

<< Example 1 >> The inner dimensions are 150 × 200 mm and the thickness is 25 μm.
200 g of edamame was filled in a four-sided sealed bag 1 which was made of a stretched polypropylene film of m and had 13 holes with an average pore diameter of 80 μm so that the open area ratio was 1 × 10 ⁻⁴ %. However, as shown in FIG. 1, an adhesive mixture of chlorinated polypropylene and ethylene-vinyl acetate copolymer having a heat resistance of 80 ° C. was applied to the seal portion 2 on the side of the existing bag so that the width 2
A 0 mm part coat part 3 was provided. It was stored at 5 ° C., and the freshness after 3 days and 7 days was observed for odor generation, browning and yellowing, and the results are shown in Table 1. Further, after storage, it was heated in a microwave oven for 3 minutes, and only the side part coat portion was opened by the steam pressure in the bag, and the green soybeans had no core and were boiled.

<< Embodiment 2 >> The same size as in Embodiment 1 is used.
Using a polypropylene polypropylene with a thickness of μm, the open area ratio is 2
One hole having an average pore diameter of 40 μm was opened so that the concentration was × 10 ⁻⁶ %, and a four-sided seal bag provided with the same part coat part as in Example 1 was used, and 200 g of the same edamame as used in Example 1 was filled, Table 1 shows the results of examining freshness after 3 days and 7 days in the same manner as in Example 1. Also, after storage for 3 minutes in a microwave oven, the side part coat was opened by the water vapor pressure in the bag, and the green soybeans had no core and were boiled.

<< Embodiment 3 >> The same size as in Embodiment 1 is used.
Using a polypropylene polypropylene with a thickness of μm, the open area ratio is 3
Using a four-sided seal bag in which seven holes having an average pore diameter of 60 μm were provided so as to be 10 ⁻⁵ % and the same part coat portion as that in Example 1 was used, 200 g of edamame similar to that used in Example 1 was filled, Table 1 shows the results of examining freshness after 3 days and 7 days in the same manner as in Example 1. Further, after storage, it was heated in a microwave oven for 3 minutes, and the side part coat part was opened by the water vapor pressure in the bag, and the green soybeans had no core and were boiled.

<< Comparative Example 1 >> Inner dimensions of 150 × 200 mm
Of a stretched polypropylene film having a thickness of 25 μm, 96 holes having an average pore diameter of 80 μm were opened so that the open area ratio was 8 × 10 ⁻⁴ %, and the same four-sided seal as in Example 1 was provided. The bag was filled with 200 g of edamame. After that, when heated in a microwave oven for 3 minutes, the horizontal seal part was opened by the steam pressure in the bag, and the green soybeans had boiled without leaving the core, but browning had occurred and the taste was considerably deteriorated. .

<< Comparative Example 2 >> Inner dimensions of 150 × 200 mm
In a packaging bag made of stretched polypropylene having a thickness of 25 μm, one hole having an average pore diameter of 25 μm was punched so that the open area ratio was 8 × 10 ⁻⁷ %, and the same part coat part as in Example 1 was provided. A four-sided sealed bag was filled with 200 g of edamame.
It had an odor after 7 days and was not suitable for eating.

<< Comparative Example 3 >> The same size as in Example 1 was used.
Using polypropylene with a thickness of μm, the open area ratio is 1
Thirteen holes having an average pore diameter of 80 μm were opened so that the concentration was × 10 ⁻⁴ %, and 200 g of the same edamame as that used in Example 1 was filled using a four-sided sealed bag not subjected to coating treatment.
Table 1 shows the results of examining freshness after 3 days and 7 days in the same manner as in Example 1. When the bag was heated in a microwave for 3 minutes after storage, the bag burst in the microwave and edamame was scattered.

[0019] Measurement of sugar content: Somogy method Conditions: Glucose conversion Hydrolysis conditions: 2.3% hydrochloric acid, 65 ° C, 15 minutes Odor: ○ None, × Yes Browning: ○ None, △ Some Yes, × Yes

[0020]

EFFECT OF THE INVENTION By using the packaging bag of the present invention, the odor generated due to the anaerobic respiration of edamame is prevented, and further, the digestion of sugars due to the anaerobic respiration is prevented, while the browning and greening due to excess oxygen are prevented. , It can be stored for a long time while keeping the freshness of edamame. Further, by lowering the heat resistance of a part of the seal portion, the vapor pressure in the bag can be adjusted even when the entire bag is heated, and the heat treatment can be safely performed without bursting.

[Brief description of drawings]

FIG. 1 is a plan view of a four-sided sealed bag in which a part coat portion is provided on a seal portion beside the bag.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location B65D 85/50 C

Claims (3)

[Claims] 1. A packaging bag containing edamame, which is made of a synthetic resin film having perforated hermetically sealed edamame, wherein the synthetic resin film having perforated area has an open area ratio of 1 × 10 ⁻⁶ to 1 × 10 ⁻⁴ %. The sealing strength of a small portion of the sealing portion of the bag is smaller than the sealing strength of other sealing portions of the bag, and the soybean 10
A edamame-containing package having a surface area per bag of 0 to 200 cm ² to 600 cm ² . 2. The edamame-containing package according to claim 1, wherein the perforated synthetic resin film has an average pore diameter of 20 to 150 μm. 3. The edamame-containing package according to claim 1, wherein a small portion of a part of the sealing portion of the packaging bag is a part coat portion formed of a part coat layer coated on one side or both sides of the sealing surface.