JP3117557B2 - Packaging with spinach - 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 spinach by maintaining respiration under an appropriate oxygen atmosphere even after the spinach is 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 spinach, and that maintains conditions that suppress deterioration of quality due to oxidation by oxygen. It is.

[0002]

2. Description of the Related Art Spinach maintains its respiratory action even after it has been harvested. For this reason, it is necessary to prevent the quality of spinach from deteriorating during storage and distribution after harvest and until eating. In addition, spinach is produced in a conventional manner in summer, and in a greenhouse in winter. Due to the nature of spinach, its quality deteriorates quickly, and polypropylene-based open packaging is used to maintain freshness. In the opened package, spinach is packaged and then breathes in the same manner as in the air, so that nutrients are consumed and water evaporates quickly, and the storage period is very short.

[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 are wrapped using such a film.However, if these wraps are almost open, the amount of oxygen in the air will be equivalent to that in the air. There is a problem that the respiratory action becomes active, spinach grows further, nutrients such as vitamins are consumed, and the taste is reduced, and furthermore, there is a problem that water is easily evaporated due to evaporation of water. Therefore, a packaging material and a packaging method that leave the original taste of spinach and can be served on a table while maintaining a fresh state have not been discovered yet.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to form a desired oxygen concentration atmosphere for maintaining the freshness of spinach for a long time, and to supply goods which do not generate off-flavors, reduce nutrients and do not wilter. It is the result of intensive research, providing the minimum amount of oxygen necessary for the survival of spinach, and keeping spinach in a hibernating state, so as to suppress 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 spinach and a package containing spinach for supplying fresh spinach.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a spinach-packed package made of a perforated synthetic resin film in which spinach is sealed, wherein the perforated synthetic resin film has an open area ratio of 7 × 10 ^{-5 to} 5 × 10 5. ^-4 %, 100% spinach
the surface area in the bag per 200 g is 200 to 900 cm ² ,
A spinach containing packaging having an average pore diameter of the pores is characterized in that it is a 20Myu～150myu, especially, it is preferable the number of that hole 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 spinach. Vinyl chloride, etc. are used, but other than these, such as films of polyamide, polyester, polycarbonate, etc., or even a composite film of these may be used, and even those provided with a sealant layer on the surface of these films, There is no problem even if the film is subjected to anti-fog treatment. The thickness of these films is usually 20 to 40 μm. 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 spinach to be packaged, and the open area ratio is 7 × 10 ^{−5 to} 5 × 10 ⁻⁴ %.
It is necessary to be. The reason for this is to maintain the amount of oxygen and carbon dioxide in the packaging bag in a condition suitable for maintaining the freshness of spinach. According to the experimental results of the present inventors, the oxygen concentration is from 6% to 18%. Desirably, the opening area ratio for satisfying these conditions is 7 × 10 ^{−5 to} 5 ×.
It becomes 10 ^-4 %. If the open area ratio is 7 × 10 ⁻⁵ % or less, the spinach becomes hypoxic during the distribution process due to the respiratory action after packaging and starts anaerobic respiration, generating an odor. If the open area ratio is 5 × 10 ⁻⁴ % or more, the amount of oxygen in the packaging bag becomes too large, and the influence of this oxygen causes yellowing and soft rot of spinach, and furthermore, the amount of oxygen This causes the problem that the respiration of spinach is activated, and spinach grows more than necessary and consumes nutrients. Therefore, the aperture area ratio of the perforated film used as a packaging bag for spinach needs to be 7 × 10 ^{−5 to} 5 × 10 ⁻⁴ %,
More preferably, it is in the range of 9 × 10 ^{−5 to} 3 × 10 ⁻⁴ %, particularly preferably in the range of 1 × 10 ⁻⁴ to 2 × 10 ⁻⁴ %.

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 spinach 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. Also, as a packaging bag for spinach, a bag in the form of a three-sided sealed bag, a four-sided sealed bag or a gusset bag can be used without any problem.
The spinach may be filled in a cup or the like, and the spinach may be packed in a packaging bag.

The size of the packaging bag for spinach must be 200 to 900 cm ² , preferably 300 to 800 cm ² , per 100 g of spinach. 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.
If the surface area in the bag per 200 g of spinach is 200 cm2 or less, the density of the spinach in the bag increases, the spinach comes in contact with each other, and is easily scratched and browned. It is not preferable because it falls into breathing. Furthermore, when the surface area in the bag per 900 g of spinach is 900 cm ² or more, the density of the spinach in the bag is reduced, the initial oxygen amount in the bag is large, and the oxygen supply amount is large in the opening area ratio, and the spinach Respiratory activity becomes active, browning is likely to occur, and the nutrients of spinach are 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 the packaging of spinach, it is a matter of course that the distribution process and the temperature control in the shop are important points for maintaining the freshness of vegetables and the like, and naturally the respiration of the spinach is also important. Depends on temperature,
Although the respiratory volume increases as these temperatures increase, the present invention assumes these temperatures to be 3-20 ° C.

[0012]

【Example】

<< Example 1 >> 200 mm × 350 mm in inner size, thickness 2
Twenty-five spinach and 20 pieces of spinach were placed in a packaging bag made of 5 μm stretched polypropylene and 135 holes having an average pore diameter of 80 μm were drilled so that the open area ratio was 4.8 × 10 ⁻⁴ %.
0 g (the surface area in the bag is 200 × 350 × 2 = 140
000 mm ² , the surface area in the bag per 100 g of spinach is 70,000 mm ^2, that is, 700 cm ² ), stored at 15 ° C., 3 days and 7 days later, the freshness was observed for odor generation and browning. 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 7.2 × 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 spinach as used in Example 1 by using a packaging bag having 80 holes of 0 μm.

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 8 so that the open area ratio is 2.0 × 10 ⁻⁴ %.
Using a packaging bag having 56 holes of 0 μm, 200 g of the same spinach as that used in Example 1 was filled, and the results of examining the freshness after 3 days and 7 days as in Example 1 are shown in Table 1.

<< Comparative Example 1 >> Inner dimensions 200 mm × 350 m
In a non-porous packaging bag made of unstretched polypropylene having a thickness of 25 μm and a thickness of 25 μm, spinach similar to that used in Example 1 was used for 20 times.
Table 1 shows the results of examining freshness after 3 days and 7 days in the same manner as in Example 1 after filling with 0 g.

<< Comparative Example 2 >> A packaging bag of the same size as that of Example 1, using stretched polypropylene having a thickness of 25 μm,
200 g of the same spinach as used in Example 1 was filled using a packaging bag in which 52 holes having an average pore diameter of 40 μ were opened so that the open area ratio was 4.7 × 10 ⁻⁵ %. Table 1 similarly shows the results of examining the freshness after 3 days and 7 days.

<< Comparative Example 3 >> A packaging bag of the same size as that of Example 1, using 25 μm thick unstretched polypropylene,
Example 1 A packaging bag having 110 holes with an average hole diameter of 100 μm was used so that the opening area ratio was 6.2 × 10 ⁻⁴ %.
Table 1 shows the results of filling 200 g of the same spinach as used in Example 1 and examining the freshness after 3 days and 7 days as in Example 1.

<< Comparative Example 4 >> A packaging bag having the same size as that of Example 1 and using a non-stretched polypropylene having a thickness of 25 μm,
Using a packaging bag having an open top, 200 g of the same spinach as used in Example 1 was filled, and the freshness after 3 and 7 days was examined as in Example 1. Table 1 shows the results.

[0019]

[Table 1]

[0020]

EFFECT OF THE INVENTION By using the packaging bag of the present invention, odor generated due to anaerobic respiration of spinach is prevented,
Moreover, nutrient digestion due to anaerobic respiration is prevented, while yellowing and soft rot due to excessive oxygen are prevented, and the spinach can be stored for a long time while maintaining its freshness.

Claims (4)

(57) [Claims] 1. In a package containing spinach comprising a perforated synthetic resin film in which spinach is sealed, the perforated synthetic resin film has an open area ratio of 7 × 10 ^{-5 to} 5 × 10 ^-4.
%, And the surface area in the bag per 100 g of spinach is 2
100 to 900 cm ² , with perforated synthetic resin film
The spinach-containing package , wherein the average pore size of the pores to be formed is 20 to 150 µm . Wherein the number of said holes having one of the package is a plurality claim 1 Symbol placement spinach package of. 3. The method according to claim 1, wherein the opening area ratio is 9 × 10 ^{−5 to} 3 × 1.
3. The package containing spinach according to claim 1, wherein the amount is ^0-4 %. 4. A spinach package of claim 1, wherein the bag surface area per spinach 100g is 300~800cm ^2.