JPH10108618A - Freshness keeping method for garden stuffs and cereal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for keeping freshness by suppressing the wet damage of garden stuffs caused when preserving or transporting the garden stuffs and cereals harvested at a growing district. SOLUTION: After the entire part or one part of garden stuffs is wrapped with a sheet having a moisture absorbing/discharging and water absorbing function or the sheet is arranged on one of upper and lower surfaces of garden stuffs at least, the garden stuffs are entirely wrapped while using a synthetic resin film so as not to be contacted with this synthetic resin film and preserved at 0-10 deg.C. When transporting cereals in a container, they are transported at the ordinary temperature while sticking the sheet having the moisture absorbing/ discharging and water absorbing function on the surface of the ceiling of the container.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preserving freshness of fruits and vegetables during storage and transportation, and more specifically, to a method of preserving or transporting harvested fruits and vegetables during film storage or transportation. After packaging the whole fruits or vegetables or a part of the fruits and vegetables with a sheet having a moisture absorbing and releasing function, a method for suppressing the decrease in freshness of the fruits and vegetables by film packaging, and when transporting cereals in containers by sea, etc. The present invention relates to a method for suppressing a decrease in freshness using a sheet.

[0002]

2. Description of the Related Art As a known technique for suppressing a decrease in freshness of fruits and vegetables, so-called low-temperature film packaging and storage has been conventionally performed (such as "Keeping Freshness of Vegetables" edited by Masukuro Okubo). This method is not universal but has a certain freshness retaining effect due to the respiratory depressing effect at low temperature and the CA effect and transpiration suppressing effect by film packaging.

[0003]

However, there are disadvantages due to the above-mentioned known technology, and in particular, moisture evaporated from fruits and vegetables adheres to the inner surface of the film due to the low moisture permeability of the film used for packaging. It is extremely difficult to prevent decay due to dew condensation and adhesion of condensed water to fruits and vegetables, resulting in the occurrence of mold and dew condensation damage peculiar to fruits and vegetables (hereinafter, deterioration of freshness due to adhesion of condensed water is collectively called "wetting loss"). It is assumed that wetting loss is unavoidable for fruits and vegetables with high transpiration.

[0004] Further, when the same film packaging is transported at room temperature by truck or the like from a production area after harvesting, the temperature rises during transportation, so that the transpiration of fruits and vegetables with high transpiration is further increased, and condensate is also increased accordingly. Therefore, the wetting loss of fruits and vegetables is a major problem that lowers the commercial value.

[0005] Further, in the case of transporting cereals such as coffee beans from overseas at ordinary temperature containers, they are usually loaded in the form of hemp bags, but the fluctuations in temperature may be very large due to the route, In such a case, a large amount of dew is generated on the ceiling and side surfaces of the container, and the dew adheres to the cereal grains, causing mold and frequent wetting.

[0006] It is an object of the present invention to provide a method for suppressing the wetting loss of fruits and vegetables produced when storing or transporting fruits and vegetables harvested in a production area in film packaging and maintaining freshness.
Another object of the present invention is to provide a method for maintaining freshness by suppressing wetting loss caused when cereals are transported at normal temperature in a container.

[0007]

Means for Solving the Problems As a result of repeated studies to solve the above problems, the present inventors have found that a superabsorbent resin and a humidity control agent coexist, and this is coated with a moisture permeable material. (Hereinafter referred to as humidity control sheet)
No. 2539), this moisture control sheet has a moisture absorbing / releasing function and a water absorbing function, and exhibits a remarkable freshness retaining effect for meat and fresh food applications. The moisture absorbing / desorbing / absorbing function of the humidity control sheet is effective in maintaining freshness of fruits and vegetables, which are apt to evaporate when the film is wrapped and are likely to cause wetting loss. The present inventors have found that the present invention is also effective in suppressing the wetting loss occurring in and maintaining the freshness, and completed the present invention.

That is, in the invention of claim 1 of the present invention, the whole fruit or a part of the fruit or vegetable is wrapped in a sheet having a moisture absorbing / releasing function and a water absorbing function, or the sheet is arranged on at least one of the upper and lower surfaces of the fruit or vegetable. Thereafter, the freshness of the fruits and vegetables is preserved at 0 to 10 ° C. by using a synthetic resin film to wrap the whole of the synthetic resin film so as not to come into contact with the fruits and vegetables.

According to a second aspect of the present invention, in the method for preserving the freshness of fruits and vegetables according to the first aspect, the fruits and vegetables are persimmons, grapes, cherries or bamboo shoots.
It is characterized in that it is stored at ５5 ° C. and in the case of cherries and bamboo shoots at room temperature.

According to a third aspect of the present invention, in transporting cereals in a container, a sheet having a function of absorbing and releasing moisture is attached to a ceiling surface of the container and transported at room temperature. Is the way.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The method for preserving the freshness of fruits and vegetables according to the present invention is a method in which the fruits and vegetables do not come into contact with each other when they are sealed with a synthetic resin film. Places where the fruits and vegetables come into contact with the synthetic resin film are in the form of paper or cloth interposed, and the whole or part of the fruits and vegetables is wrapped in a humidity control sheet.
Alternatively, simply wrap a synthetic resin film in at least one of the upper and lower surfaces of the fruits and vegetables, wrap it using a synthetic resin film, and store and transport in a temperature range of 0 to 10 ° C to suppress the wetting loss of the fruits and vegetables. It is characterized by.

The method for maintaining the freshness of cereals according to the present invention is a method in which a humidified sheet is attached to the ceiling surface of the container, and more preferably to the entire side surface when the harvested cereals are transported from overseas to Japan at normal temperature. In addition, the container is stored in a sealed state and transported to suppress the wetting loss of cereals.

That is, in the present invention, 0 to 10 ° C.
When wrapping fruits and vegetables in synthetic resin film in a certain temperature range, moisture vapor evaporating from the fruits and vegetables is absorbed by the humidifier through the moisture-permeable material of the humidity control sheet, thereby forming dew condensation on the inner surface of the synthetic resin film. Prevention, and when the evaporation rate exceeds the moisture absorption capacity of the humidity control agent, the super absorbent resin of the humidity control sheet absorbs water and retains water inside the humidity control sheet. Therefore, since the water and fruits and vegetables that have transpired are separated, dew condensation can be prevented from attaching to the fruits and vegetables.When packaging fruits and vegetables at room temperature with a synthetic resin film, in addition to the same effects as above, Due to the rapid change in temperature, the humidity control sheet functions to release moisture when the temperature rises and absorb moisture when the temperature drops, thereby alleviating changes in the relative humidity in the synthetic resin film space. That the relative humidity of the neighbor can be prevented from generating dew condensation becomes 100%, in which the principle of wet loss prevention. The above principle is also applied to container transport of cereals at room temperature. Such a complex multifaceted function of the humidity control sheet is an excellent function that cannot be obtained by a conventional water-absorbent sheet having only a superabsorbent resin that does not contain a humidity control agent.

The fruits and vegetables targeted in the present invention include vegetables, fruits and mushrooms including leaf vegetables, root vegetables and fruit vegetables. Specifically, as an example of fruits and vegetables,
Any substance can be used as long as it has a large transpiration at a low temperature. Examples thereof include cherries, grapes, strawberries, asparagus, spinach, eggplant, cucumber, mushrooms, bamboo shoots, and chestnuts. Further, it can also be used for those which cause a specific condensation trouble due to adhesion of dew water, for example, astringent persimmon.

In the present invention, the target cereals include:
Includes cereals such as rice, wheat and coffee beans. Specific examples of cereals include, but are not limited to, those that are transported at room temperature in a container. Examples thereof include coffee beans, cacao beans, and rice.

The humidity control sheet used in the present invention is disclosed in
This sheet has the structure disclosed in Japanese Patent No. 12539, and is a sheet in which a superabsorbent resin is brought into contact with a humectant, and this is covered with a moisture-permeable material. The superabsorbent resin and the humectant have different functions. The superabsorbent resin mainly has a water absorbing function, and the humectant mainly has a moisture absorbing and releasing function. Furthermore, the humectant absorbs or releases moisture depending on the surrounding temperature and humidity conditions. That is, it absorbs moisture under low temperature and high humidity conditions and releases moisture under high temperature and low humidity conditions.

The synthetic resin film used in the present invention is not particularly limited, and may be a single film or a laminated film in which the synthetic resin film is laminated with another base material such as paper or aluminum foil. Any material that can be normally used for storage can be used. For example, a typical example is a polyethylene film. The film thickness is not particularly limited, and for example, a film having a thickness of 0.02 to 0.05 mm is preferable.
The method of wrapping the fruits and vegetables with the synthetic resin film is not particularly limited, and may be, for example, a simple method such as folding, tying the mouth, or a heat sealing method.

The method for using the humidity control sheet is not particularly limited as long as the fruit and vegetable and the synthetic resin film are not in direct contact with each other. Specifically, for example, a method of wrapping the whole or a part of the fruits and vegetables with a humidity control sheet, a method of arranging the humidity control sheet on at least one of the upper and lower surfaces of the fruits and vegetables, and using the humidity control sheet and a synthetic resin film bonded together And the like. In this case, the humidity control sheet may be in the form of directly contacting both the synthetic resin film and the fruit or vegetable, or may be in the form of direct contact with either one, or may be in the form of not directly contacting both. Good.

The temperature at the time of transportation or storage used in the present invention is from 0 to 10 ° C., but in the case of fruits and vegetables, it is generally 0 ° C. or more and close to 0 ° C. so as to reduce transpiration. The closer, the better. However, depending on the type of fruits and vegetables, there is a possibility that the temperature condition that can be used differs depending on the target object.
It is preferable to determine a temperature that can be suitably used from a temperature range of -10 ° C. Further, although the effect is low for those currently transported and stored at room temperature, they may be used at room temperature.

[0020]

EXAMPLES Examples for confirming specific examples and effects of the present invention will be described below, but the present invention is not limited to these examples unless departing from the gist of the present invention. In addition, the comparative example mentioned the method generally used on the market. (Example 1) Polypropylene container (50 cm x 3
5cm), lay a solid alcohol sheet for newspaper removal and newspaper on top of it, place 15 pieces of persimmon (Yamanashi) (fruits and vegetables) just after harvesting, and make a humidity control sheet [Showa Denko Co., Ltd. )] (50 cm x 35 cm), and then placed in a plastic bag (material: polyethylene, thickness: 0.03 m)
m), wrap and wrap the entire container at 0.5 ° C.
For one month.

(Comparative Example 1) The same operation as in Example 1 was performed except that the humidity control sheet of Example 1 was not used.

As a result of the storage test, in Example 1, no dew was formed on the inner surface of the plastic bag and the persimmon skin, and the bag was stored in a state where the appearance was not impaired. On the other hand, in the case of Comparative Example 1,
Condensation was formed on the inner surface of the plastic bag and on the persimmon skin, and black spots, which are dew condensation damage peculiar to persimmons, were formed, and the commercial value was significantly impaired. Comparative Example 1 is a known method performed when astringent persimmons are deaerated, but the decrease in commercial value caused by the formation of black spots that has conventionally occurred during the astringent persimmon is reduced by the method of the present invention using a humidity control sheet. It became possible to suppress.

(Example 2) A humidity control sheet [manufactured by Showa Denko KK] (50 cm x 35 cm) was added to the container described in Example 1.
One sheet is laid, and five bunches of grapes (kind: Kaiji (Yamanashi)) (fruits) immediately after harvest are placed, and one of the humidity control sheets is placed thereon, and then a plastic bag (material: polyethylene, (Thickness: 0.05 mm), the entire container was wrapped and wrapped, and stored at 0.5 ° C. for 2 months.

(Comparative Example 2) The same operation as in Example 2 was performed except that the humidity control sheet of Example 2 was not used.

As a result of the storage test, in Example 2, a small amount of dew was formed on the side of the container. However, no dew was formed on the inner surface of the plastic bag and the grapes, and the container was stored in a state where there was no problem in appearance. Was. On the other hand, in Comparative Example 2, the film inner surface,
Condensation had formed on the entire container and on the grape skin, and mold had formed on all five bunches, which had already lost commercial value. In Example 2, the whole grape was not wrapped with a humidity control sheet, and although dew condensation occurred slightly on the side of the container, dew condensation on the side hardly adversely affects the commercial value of the grape. It is thought that it was done.

Example 3 Bamboo shoots immediately after harvest (Fukuoka, 10
Book) (root vegetables) whole humidity control sheet [Showa Denko KK]
(50 cm x 35 cm), wrap it in a plastic bag (material: polyethylene, thickness: 0.02 mm), tie the mouth of this plastic bag with a rubber band, put it in a cardboard box, and transport it by truck at room temperature. (2 days from the date of harvest), and the state of the cut edge upon arrival was visually observed.

(Comparative Example 3) The same operation as in Example 3 was carried out except that the humidity control sheet of Example 3 was not used and one cold storage material (2 kg) was used. The cool storage material was used by placing it on the bamboo shoots. In each of Example 3 and Comparative Example 3, a thermometer was set in a plastic bag, and a temperature change during transportation was monitored.

As a result of the transport test, in Example 3, no dew was formed on the inner surface of the plastic bag, and the bamboo shoot was transported in a white state with a high commercial value. On the other hand, in Comparative Example 3, dew was formed on the inner surface of the plastic bag, and water that had come out of the cut was collected on the bottom of the plastic bag, and the cut was immersed. The cool storage material is 3
The effect lasted for a while.

Example 4 An iron container (1 m × 1 m ×
1m) humidity control sheet [Showa Denko Co., Ltd.]
4) (95cm x 95cm) with double-sided tape, coffee beans (arabica) (millions) 400kg
Was put in a container in the state of roses, closed, closed and placed in an environmental tester. Next, the temperature condition was changed from 25 to 45.
° C linearly in 3 hours, leave at 45 ° C for 3 hours, then linearly drop from 45 to 10 ° C in 3 hours, open the container lid, and form dew on the container lid and side I checked whether it was done.

(Comparative Example 4) The same operation as in Example 4 was carried out except that the humidity control sheet was not used.

In Example 4, no condensation was formed on both the lid and the side of the container after the test. On the other hand, in Comparative Example 4, dew was formed on the side surface and a part of the lid.

[0032]

According to the method of the present invention, it is possible to suppress the wetting loss of the fruits and vegetables produced when storing or transporting the fruits and vegetables harvested in the production area in film packaging and maintain the freshness. According to the method of the present invention, freshness can be maintained by suppressing the wetting loss that occurs when cereals harvested in a production area are transported in a container at room temperature.

Claims (3)

[Claims] 1. A sheet having the function of absorbing and releasing moisture and absorbing water, wrapping the whole fruit or a part of the fruit or vegetable, or disposing the sheet on at least one of the upper and lower surfaces of the fruit or vegetable, and then using a synthetic resin film. Wrap the whole so that this synthetic resin film does not come in contact with fruits and vegetables
A method for preserving the freshness of fruits and vegetables, characterized by storing the fruits and vegetables. 2. The fruits and vegetables are persimmons, grapes, cherries or bamboo shoots, and the persimmons and grapes are stored at 0 to 5 ° C., and the cherries and bamboo shoots are stored at room temperature. To keep fresh fruits and vegetables. 3. A method for maintaining the freshness of cereals, wherein when the cereals are transported in a container, a sheet having a function of absorbing and releasing moisture is attached to a ceiling surface of the container and transported at room temperature.