JPH04128164A - Packaging material for perishable vegetable, fruit flower and method of its production - Google Patents

Abstract

PURPOSE:To obtain the packaging material high in heat insulating performance and capable of adsorbing and removing 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 a specific water-impermeable film is used in the inner most layer. CONSTITUTION:The packaging material is of the four layer structure made up of a plastic film having a gas permeability of at most 6500sec/100cc and a water proofness of at least 3mm, a paperboard, an intermediate corrugated core consisting of paperboard or foaming plastic having a baffle on the paperboard on the outside of the film and a paperboard or closed cell foaming plastic plate on the innermost surface of the opposite side of the core, powdery or granular gas adsorbent is filled in to be attached to the paperboard on the innermost plastic film side and the inside of the baffle in the recess part of the corrugated core and the packaging material is heat insulated to avoid the influence from the outside air even slightly. The film used is a liquid impermeable type to prevent the other materials of the package from wetting and the harmful gas liberated from plants such as ethylene gas is removed effectively by adsorption on the adsorbing material.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to packaging materials for storing and transporting fresh vegetables, fruits, flower petals, etc. without wilting, and a method for manufacturing the same.

[Conventional technology]

Conventionally, paperboard packaging has been used in the simplest cases for transporting fresh vegetables, fruits, flower petals, 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 generate ethylene gas during storage, and that the gas causes the plants to rapidly wilt.As a countermeasure, a 6-film film that is permeable to gases but not permeable to liquids has been developed. It has been proposed that Oya stone powder is dispersed in the powder.

However, the present situation is that no packaging material with sufficiently 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]

As mentioned above, since all conventional materials were intended to achieve a single purpose, the present invention was developed to achieve multiple purposes simultaneously and with high efficiency.

In other words, we have created a packaging material that has high insulation performance and can highly efficiently adsorb and remove gases harmful to plants, such as ethylene gas.

[Means to solve the problem]

Fruits and vegetables, for example, have the property of emitting ethylene gas, especially large amounts of ethylene gas during the ripening period, and the fruit 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, for example, removing the generated ethylene gas as quickly as possible is extremely effective in maintaining the freshness of fruits and vegetables. Therefore, as a result of various studies regarding the means for this purpose, we decided to use 6 films that have gas permeability but do not allow liquids, especially water to pass through, as the innermost layer of the packaging material, and outside the 6 films. Materials that adsorb or decompose ethylene gas and other gases harmful to plants (hereinafter collectively referred to as adsorbents)
The present invention is characterized in that ethylene gas and other gases generated from fruits and vegetables are allowed to pass through the above-mentioned six films and are adsorbed and fixed, thereby being removed from the packaging contents and preventing moisture from permeating. The reason why we used 6-film, which does not allow liquids to pass through, is that the adsorbent's gas adsorption ability generally decreases significantly due to moisture absorption, and that if the moisture content of the package decreases too much, the freshness of the fruits and vegetables will deteriorate. be.

It is also widely known that fruits, vegetables, flower petals, etc. generally tend to wilt faster the higher the temperature.
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 includes (1) 6 plastic films with an air permeability of 6,500 seconds/100 cc or less and a waterproof rating of 3 mm or more on the innermost surface of (2)
(3) A corrugated core made of paperboard or foamed plastic with a weir on the outer paperboard of the six films; (4) The outermost surface on the opposite side of the core is paperboard or closed-cell plastic foam board.

(5) powder or granules of a gas adsorbent is filled and attached to the inside of the weir of the concave part of the paperboard and corrugated core on the innermost plastic 6 film side; - Concerns packaging materials for fruits and flowers. In this case, the paperboard on the 6th film side and the corrugated core may be bonded at points or partially, or after laminating the 6th film on the paperboard, only the 6th film is perforated, and the paperboard with the 6th perforated film is made into a corrugated board. It is preferable to

The reason why the six films used in the present invention are defined as in (1) above is that gases can pass through them, but liquids cannot pass through them. This has made it possible to effectively adsorb and remove harmful gases such as ethylene gas emitted from plants by the adsorbent material without wetting materials other than the six films of the packaging material with the liquid. The ethylene gas permeability of commercially available Oya stone-containing 6 films or polystyrene 6 films was measured using the method of the present invention.
．． It was 0.8.9pρ■, and a marked difference was recognized.

In order to achieve the above object, in the present invention, the air permeability of the 6 films is set to 6500 seconds/100cc or less, and the waterproof level is set to 3.
It was defined as m+ or more. In this case, the air permeability is JIS P8
117 r Air permeability test method for paper and paperboard", and the waterproofness is a value measured using a Schopper water resistance tester. Waterproofness was measured using a Schopper water resistance tester using JIS Z 1503 r tarpaulin paper.
The water pressure is increased sequentially from the bottom surface of the six films to be tested according to the normal water permeability test method, and the water pressure when water first penetrates to the top surface of the six films to be tested is indicated by the height of the water column.

In this case, a circular hole with an area of 87cj is made in the center of aluminum foil coated with adhesive on one side, and the aluminum foil and the test piece 6 are
A test piece was prepared by bonding the sample with a film.

The six films in (1) may be those in which powder grains of a porous material consisting of open cells are dispersed,
It may also be one in which cellulose-based fine fibers are dispersed. Further, a 6-film perforated with extremely fine needles or a film provided with fine perforations by corona discharge may be used, and a non-woven fabric may be used instead of the 6-film.

Examples of porous materials include zeolites and zeolites.

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.

As mentioned above, the present invention provides the following features: (i) a plastic that is both air permeable and waterproof;
Film, ■ Paperboard.

■ A corrugated core with a weir, and ■ Gas adsorbent filling and installation in the grooves of the corrugated core, which are organically combined under specific conditions for the storage and transportation of fresh plants. It provides suitable packaging materials.

〔Example〕

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

Example 1 A test piece of 25 x 20 (! A sample was prepared by filling the concave part of the core with 5 g of a mixture of activated carbon, some silica gel, and fine metal powder as a gas decomposition catalyst as a gas adsorbent, and the sample was sealed in a separately prepared 5 ft tetrapack. After that, seal the Tetra Pak, then fill the Tetra Pak with 5 fl of ethylene gas adjusted to a concentration of 5PP using a syringe, and then apply a plastic 6 film tape to the injection needle hole to close the hole. Then, 30 minutes later, 12
After 0 minutes, the gas concentration in the Tetra Pak was analyzed by gas chromatography, and the ethylene gas concentration was 2.
It was less than 0 ppm and 0.6 pp+s. Furthermore, in order to investigate the influence of moisture, the filled ethylene gas was humidified to a relative humidity of 90% and filled into a Tetra Pack in the same manner as above, and 30 minutes and 60 minutes later.

When I checked the condition after 120 minutes, it was 3.7pp for each.
．． 4ppm.

It was 3.lPP-.

Gas adsorbent 40 having gas decomposition/adsorption performance as described above
Fill the grooves of the corrugated core of a corrugated cardboard box with a length of 1000 m, a width of 350 m, and a height of 550 m, and - on the inner surface, polystyrene 6 film with an air permeability of 0 seconds/100 cc and a waterproof rating of 5 is placed inside the cardboard. A packaging box was made using paperboard laminated with partial adhesive.

Ten days after the chrysanthemum flowers were stored in the area, the IJts did not wilt and remained fresh and healthy. As a result, it was confirmed that the insulating properties were good, ethylene gas was removed, water evaporation was moderate, and the flowers did not get stuffy, which was very good.

Example 2 In place of the perforated polystyrene 6 film of the sample in Example 1, a polypropylene 6 film in which finely cut pieces of viscose rayon were dispersed was used, and activated carbon was mixed with some silica gel and fine metal powder as a gas adsorbent. The sample was sealed in a corrugated cardboard core and measured in the same manner as in Example 1. When not humidified, it was 1.9 ppm and 0.5 pps+, and when humidified it was 3.6 ρpym and 3.3 PPIIt 2-
The pH was 8P. 40 g of the above gas adsorbent was filled into the grooves of the corrugated core of a cardboard box for packaging having the same shape as in Example 1.

Air permeability 30 seconds/100cc, waterproof level 3 on the innermost surface of the packaging box
A film of the same shape as that of the example was made using partially bonded polypropylene 6 film of 0 film, and the sudachi was stored at a low temperature for 2 weeks.

The sudachi contents had no wilting, no change in color, and had appropriate humidity. As a control, those stored in ordinary cardboard boxes were considerably discolored to yellow.

Example 3 The value obtained by the test method of Example 1 was before humidification and after 30 minutes 2
．． 7.120 minutes later 2.6; 30 minutes after humidification 3a, 7
After 3S for 60 minutes and 0.120 minutes, a gas adsorbent made of amorphous carbon of 3.5 degrees was used.

The above gas adsorbent 30. A packaging box of the same shape as in Example 1 was made using a cardboard sealed with a polyvinylidene chloride 6 film with an air permeability of 0 seconds/100 cc and a waterproof rating of 10 ■ attached to the innermost surface of the box. Broccoli from the Tohoku region was pre-cooled inside, then stored and transported. When the broccoli arrived two days later, it was blue in color and had a lower temperature than the broccoli stored in regular cardboard containers. In addition, the contents of the membrane-equipped bowls were yellow in color, but those containing the product of the present invention had almost no change from when shipped.

Example 4 2.8°12 after 30 minutes without humidification using the same test method as Example 1
(1.9 after + minutes; 3.7 after 30 minutes of humidifying product; 50 minutes 3),
4. After 120 minutes, the gas adsorbent of 3.3 was used.

60g of gas adsorbent was placed in the corrugated core of the same packaging box as in Example 1.
Enclosed, air permeability 1200 seconds/100cc, waterproof level 1
Using a cardboard laminated with 800IIII polyester 6 film, pears were stored in an ITl and stored for a long period of 4 months at a low temperature.

There was no change in the taste of the pears that had been stored, but the taste of the pears that had been stored in ordinary single-membrane bowls had become dull and the taste had deteriorated significantly.

〔Effect of the invention〕

By using the packaging box manufactured using the product of the present invention detailed above, it is possible to efficiently adsorb and remove ethylene gas generated from fresh plants stored in the facility, and to minimize changes in the internal temperature. This has the effect of keeping the contents intact for a long time, making it a huge contribution to industry.

Claims (1)

[Scope of Claims] 1. A plastic film with an air permeability of 6,500 seconds/100 cc or less and a waterproofness of 3 mm or more is placed on the innermost surface of the packaging box, followed by a corrugated core made of paperboard and a paperboard or foamed plastic sheet with a weir. Paperboard or closed-cell plastic foam board is laminated and fixed on the outer surface of the core, and gas is inserted between the weirs in the recesses of the corrugated core on the innermost plastic film side that contacts the paperboard. Packaging materials for fresh vegetables, fruits, and flower bags that contain adsorbent or decomposer powder or granules. 2. The packaging material for fresh vegetables, fruits, and flowers according to claim 1, wherein the plastic film contains an open-cell porous material penetrating both the front and back surfaces. 3. The packaging material for fresh vegetables, fruits, and flower bags according to claim 1, wherein the plastic film contains cellulose fine fibers. 4. The packaging material for fresh vegetables, fruits, and flower bags according to claim 1, wherein the plastic film has needle holes perforated with extremely fine needles, or fine perforations are provided by corona discharge. 5 The gas adsorbent or decomposition material is activated carbon, zeolite,
The fresh vegetables, fruits, and flowers according to any one of claims 1 to 4, which are powders or granules selected from cristobalite, Oya stone, bentonite, amorphous carbon, metal powder as a gas decomposition catalyst, etc. Packaging materials for shipping. 6 Claim 1 in which nonwoven fabric is used instead of film
Or packaging materials for fresh vegetables, fruits, and flower bags as described in item 5. 7. Claims 1 to 6, wherein the corrugated cardboard is double corrugated cardboard.
Packaging materials for fresh vegetables, fruits, and flower bags as described in any one of the following items. 8. The packaging material for fresh vegetables, fruits, and flower bags according to any one of claims 1 to 7, wherein aluminum foil is attached to the outermost surface of the opposite side of the film. 9 A corrugated core made of paperboard or foamed plastic sheet is laminated with a plastic film having an air permeability of 6,500 seconds/100cc or less and a waterproofness of 3mm or more on one side of the paperboard, and a weir on the other side of the paperboard. Paperboard or closed-cell plastic foam board is laminated and fixed on the outer surface of the core, and powder of gas adsorbent or decomposition material is placed between the weirs in the recesses of the corrugated core on the side where the plastic film contacts the paperboard. A method for manufacturing packaging materials for fresh vegetables, fruits, and flower bags that encloses and attaches granules.