JPH04128163A - Packaging method for plants to prevent contraction thereof - Google Patents

Abstract

PURPOSE:To obtain the packaging material high in heat insulating performance and capable of adsorbing and removing the harmful gas such as ethylene gas with a high degree of efficiency by a method wherein a baffle is provided in the groove part of the intermediate corrugated core of a corrugated cardboard to prevent the movement of air and the detachment of powdery adsorbent simultaneously and contents are received in a specific bag within a case. CONSTITUTION:The packaging material is of the three layer structure made up of a paperboard on the innermost surface, an intermediate corrugated core consisting of the paperboard having a baffle on its outside or foaming plastic and a paperboard or closed cell plastic foaming plate on the outermost surface of the corrugated core, a powdery or granular gas adsorbent is filled in and attached to the baffle in the recess part of the corrugated core on the side in contact with the innermost paperboard, gas permeability is set at 6500sec/100cc, since the gas adsorption power is considerably decreased due to moisture absorption and since the freshness of vegetables and fruits is deteriorated due to an excessive decrease in the water in package contents, the film specified to be at least 3 mm in water proofness is used on the innermost part of the packaging material and the material capable of adsorbing or releasing ethylene gas is provided on the outside of the film to permeate the gas evolving from the vegetables and fruits through the film to be adsorbed and fixed thereon so as to remove the ethylene gas from the package contents.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Utilization Stomach] The present invention relates to a packaging method for storing and transporting fresh vegetables, fruits, flowers, and other plants without causing them to wilt.

[Conventional technology]

Conventionally, paperboard packaging has been used in the simplest cases for transporting fresh vegetables, fruits, flowers, etc., and foamed packaging is used to prevent damage caused by contact friction between the contents or for insulation purposes. A material made of polystyrene is used.

In general, plants are sensitive to temperature and tend to wilt quickly when the temperature is higher than room temperature.
It is convenient to keep it at about ℃.

Therefore, for items that are sensitive to the influence of temperature, cardboard or a substitute for expanded polystyrene is widely used.

Recently, it has been discovered that the above-mentioned fresh plants emit ethylene gas during storage, and that the gas causes the plants to rapidly wilt.As a countermeasure, a film that allows gases to permeate but not liquids to permeate is used. A dispersion of stone powder has been proposed.

However, the present situation is that no packaging material with satisfactory performance has yet been created that has good heat insulation properties and adsorption/removal properties for ethylene gas.

[Problem to be solved by the invention]

1. As mentioned above, since all existing materials have been used to achieve a single purpose (4), the present invention has been developed in order to achieve many purposes simultaneously and with high efficiency. It was developed.

That is, we have developed a packaging method that has high insulation performance and can adsorb and remove harmful gases such as ethylene gas with high efficiency.

[Means to solve the problem]

Fruits and vegetables have the property of emitting ethylene gas, especially large amounts of ethylene gas during the ripening period, and fruits and vegetables themselves age and ripen due to the ethylene gas they generate. have. In general, the limit value of ethylene gas to which plants are affected by ethylene gas varies depending on the type of plant, but is approximately 0.
It is said to be about 1-1.0 ppm.

Therefore, removing the generated ethylene gas as quickly as possible is extremely effective in maintaining the freshness of fruits and vegetables.

As a result of various studies, we decided to use a film that has gas permeability but does not allow liquids, especially water, to pass through as the innermost layer of the packaging material, and on the outside of the film. We have invented a method in which a material that adsorbs or decomposes ethylene gas (hereinafter simply referred to as an adsorbent) is present to allow the ethylene gas generated from fruits and vegetables to pass through the film and be adsorbed and fixed, thereby removing it from the package contents. The reason why we used a film that does not allow liquid to permeate in this case is that the adsorbent generally loses its gas adsorption ability significantly due to moisture absorption.
This is because if the moisture content in the package decreases too much, the freshness of the fruits and vegetables will deteriorate.

It is also widely known that the higher the temperature, the faster fruits, vegetables, and flowers tend to wilt.
In order to avoid the influence of outside air as much as possible, weirs are provided in the grooves of the corrugated core in the middle of the cardboard to give the packaging material insulation properties, which prevents the movement of air and at the same time prevents adsorbent powder or granules from falling off. Prevented. Moreover, by using foamed plastic as the core material, it is possible to further improve the heat insulation properties.

The product of the present invention has (1)! (2) A corrugated core made of paperboard or foamed plastic with a weir on the outside of the paperboard; (3) The outermost surface of the corrugated core is paperboard or a closed-cell plastic foam board. (4) Gas adsorbent powder or granules are filled inside the weir of the recessed part of the corrugated core on the side that contacts the innermost paperboard, and (5) IT! Plants must be packed in plastic film bags with an air permeability of 6,500 seconds/100 cc or less and a waterproof rating of 3I or higher, and then stored.

The present invention relates to a packaging method for fresh vegetables, fruits, and flowers, which is characterized by the following.

In the present invention, the reason for specifying the film as described in (1) above is that gas is permeable but liquid is not permeable. This has made it possible to effectively adsorb and remove ethylene gas emitted from plants by the adsorbent without the packaging material other than the film being wetted by the liquid. The ethylene gas permeability of commercially available Oya stone-containing films or polystyrene films was measured using the method of the present invention.1.7.
It was 9.0.11.9 ppm compared to 2 ppm, and a significant difference was observed.

In order to achieve the above object, in the present invention, the air permeability of the film is set to 6500 seconds/100cc or less, and the waterproof level is set to 3■
The above is stipulated. The air permeability in this case is JIS P811
7 r Paper and paperboard air permeability test method", and the waterproofness is a value measured using a Schopper water resistance tester. 6Waterproofness is a value measured using a Schopper water resistance tester according to JIS Z The water pressure is increased sequentially from the bottom surface of the film under test according to the normal water permeability test method for ``1503R tarpaulin paper'', and the water pressure when water first penetrates the top surface of the film under test is indicated by the height of the water column. .

In this case, a circular hole with an area of 87 ffl was made in the center of an aluminum foil coated with an adhesive material on one side, and the aluminum foil and the film to be tested were bonded together to form a test piece.

The film (5) may be a film in which powder particles of a porous material consisting of open cells are dispersed, or a film in which cellulose fine fibers are dispersed. Alternatively, a film perforated with extremely fine needles or a film provided with fine perforations by corona discharge may be used. Nonwoven fabric can also be used instead of film.

Examples of porous materials include activated carbon and zeolite.

Although cristobalite, Oya stone, bentonite, metal powder as a gas decomposition catalyst, etc. can be used, activated carbon is particularly effective. Further, as the cellulose-based fine fibers, cotton, which is a natural fiber, can be used, but recycled fiber-based fibers are particularly suitable.

If a higher degree of heat retention and insulation is required, this purpose can be achieved by using double corrugated cardboard or by pasting aluminum foil on the outermost surface.

The present invention is as described above.

■ Use of a plastic film that is both air permeable and waterproof; ■ Corrugated board with a weir in the grooves of the corrugated core; ■ Filling and installing gas adsorbent in the grooves of the corrugated core. The present invention provides a packaging material suitable for storing and transporting fresh plants, which is characterized by being organically combined under specific conditions.

〔Example〕

In order to explain the present invention more specifically, the present invention will be described in further detail with reference to Examples.

Example: After storing pears in a bag made of polyester film with an air permeability of 1200 seconds/100 cc and a waterproof rating of 1800 am, and sealing the bag, 60 g of gas adsorbent was sealed in the corrugated core, and the packaging was made of a 40X corrugated cardboard box. The bags were stored in a 30 x 25 am packaging house and stored at low temperature for 4 months.

There was no change in the taste of the pears that had been stored, but the pears that had been stored in ordinary cardboard boxes had a stale taste and the taste had deteriorated significantly, whereas the pears that had been stored using the method of the present invention were There was almost no difference in taste.

〔Effect of the invention〕

When stored using the method of the present invention detailed above, the contents can be preserved by efficiently adsorbing and removing ethylene gas generated from fresh plants stored in the facility, and minimizing changes in the temperature within the facility. It has the effect of being able to maintain it in a state that does not wilt for a long time, and it has a tremendous contribution to industry.

Claims (1)

[Claims] 1 A corrugated core made of paperboard or foamed plastic sheet with a weir in the innermost layer, and a corrugated core made of paperboard or foamed plastic sheet with a weir, and a corrugated core made of paperboard or closed cell plastic foamed board laminated and fixed on the outside, and the corrugated core on the side in contact with the innermost layer of paperboard. A packaging box made of cardboard is filled with powder or granules of gas adsorbent or gas decomposition material between the weirs of the concave part of the core, and has an air permeability of 6500 seconds/100cc or less and a waterproof degree. A method for packaging plants to prevent shrinkage, characterized by enclosing fresh vegetables, fruits, flowers, etc. in bags made of plastic film of 3 mm or more and then storing them.