JP6400416B2 - Freshness packaging form for fruits and vegetables - Google Patents

Description

  The present invention relates to maintaining the freshness of fruits and vegetables using a cardboard box.

  When transporting fruits and vegetables over a long period of time, the problem is how to maintain freshness. If you simply pack it in a box that is completely in circulation with the outside air, it will mature and age. On the other hand, if it is completely sealed, the carbon dioxide in the box will increase too much, and the fruits and vegetables cannot breathe, leading to quality degradation. For this reason, attempts have been made to control the freshness and taste of fruits and vegetables stored and transported in the package by releasing a drug or providing a gas absorber in the package.

  For example, Patent Document 1 describes a packaging system that can release chlorine dioxide, nitrogen, sulfur dioxide, ethylene, insecticide, and the like into a package.

  By the way, in some fruits and vegetables, maturation and aging may be promoted by ethylene released by themselves. The tendency becomes even stronger when the box is sealed. On the other hand, it is known that a cyclopropene compound such as 1-methylcyclopropene (1-MCP) is exposed to inhibit the action of ethylene (Patent Documents 2 and 3).

Special table 2013-525215 gazette JP 2011-19514 A Special table 2013-512001 gazette

  However, if a normal cardboard box is used as a packaging body for packaging fruits and vegetables, 1-MCP will escape from the wall surface and gaps of the cardboard box, and the concentration will sufficiently exert the maturation inhibiting effect on the fruits and vegetables in the vicinity of the drug. Even in such a case, the concentration of fruits and vegetables far from the chemicals such as corners in the cardboard box is not high enough to exert a maturation inhibiting effect, and the quality of the fruits and vegetables becomes uneven depending on the position in the box. Alternatively, in order to sufficiently exert the maturation inhibitory effect on fruits and vegetables separated from the drug, it is necessary to add the drug excessively, which is not practical.

  In addition, if the water vapor released by the fruits and vegetables flows out of the box too much, the humidity does not increase sufficiently at the corners of the cardboard box, so it is released when a drug that senses humidity is placed at the corners of the box. The amount of medicine generated is reduced, leading to a decline in the quality of fruits and vegetables. Furthermore, the component generated from the medicine installed at the corner immediately flows out of the box. For this reason, in order to use 1-MCP effectively, the gas barrier property of a cardboard box must be improved.

  On the other hand, if a cardboard box with a gas barrier property that is too high is used, the carbon dioxide released by the respiration of the fruits and vegetables cannot be removed and the fruits and vegetables cause anaerobic breathing, resulting in a deterioration in the quality of the fruits and vegetables.

  Then, this invention aims at providing the packaging environment which arranges the freshness maintenance of fruits and vegetables more suitably, utilizing the inhibitory effect to the ethylene action by 1-MCP.

This invention
As a cardboard box containing fruits and vegetables,
May include exterior, interior or both,
1-MCP exchange rate inside and outside after 1 hour is 11% or more and 42% or less,
Using an airtight corrugated cardboard box in which the internal and external carbon dioxide exchange rate after 15 hours is 15% or more and 35% or less,
The above-mentioned problem has been solved by making the airtight cardboard box contain a medicine capable of releasing 1-MCP together with fruits and vegetables in the cardboard box.

  The “internal / external X exchange rate after n hours” means the gas component X flowing out to the outside after n hours among the predetermined gas components X originally present inside the empty box. The volume ratio. In addition, it may call a ventilation rate collectively.

  1-MCP fixed to cyclodextrin and used as a powder starts to evaporate 1-MCP from the powder under a high humidity environment of approximately 60% RH to 90% RH or more. When fruits and vegetables are accommodated in a cardboard box where the carbon dioxide exchange rate is the above condition, water vapor released from the fruits and vegetables is accumulated in a short time, and 1-MCP begins to be released. That is, the release of 1-MCP is started when a certain amount of time has elapsed after completion of packaging. This is close to the timing at which ethylene released by the fruits and vegetables itself easily accumulates in the cardboard box, so that the action of 1-MCP can be started at a suitable timing.

  On the other hand, if priority is given to maintaining 1-MCP and the sealing performance is increased too much, carbon dioxide due to the respiration of fruits and vegetables is accumulated inside the cardboard box, and the fruits and vegetables fall into anaerobic respiration, leading to quality deterioration. In this invention, by setting it as said exchange rate, a carbon dioxide can be flowed out of a box moderately and the quality deterioration of fruits and vegetables can be prevented.

  It is difficult to achieve the above ventilation rate by using a cardboard box of a general shape as it is. If the reaching point of the slot forming the flap is positioned closer to the front end side of the flap than the folding line of the flap, no hole is formed at the corner of the assembled cardboard box, so that the ventilation rate can be suppressed. In addition, by increasing the length of the flap so that the space between the top and bottom flaps of the cardboard box can be closed, or by providing a resin cushion sheet as the interior, the gas barrier property of the entire cardboard box is improved. This makes it easy to execute the freshness maintaining mode according to the present invention. In addition, if the tape that can be sealed is affixed between the abutted outer flaps or between the sides of the outer flap and the folding line of the inner flap as an exterior, the ventilation rate can be controlled here as well. Can do.

As the corrugated cardboard sheet constituting the corrugated cardboard box, the inner liner on the inner side of the box has a 1-MCP permeability of 300 ml / m ² · 24 h or less and a carbon dioxide permeability of 10 ml / m ² · 24 h to 400 ml / m ² · 24 h or less, water vapor permeability is 10 g / m ² · 24 h or more and 300 g / m ² · 24 h or less,
The outer liner and medium shin outside the box have a 1-MCP permeability of 300 ml / m ² · 24 h or more, a carbon dioxide permeability of 400 ml / m ² · 24 h or more, and a water vapor permeability of 300 g / m ² · 24 h or more. It is good to be.
Carbon dioxide and water vapor blocked by the low-permeability inner flap can enter between the liners from the end face perpendicular to the cross-sectional direction of the inner flap, and gradually flow out of the box through the high-permeability outer flap.

  By using the packaging form of fruits and vegetables according to the present invention, the 1-MCP concentration in the cardboard box in which the fruits and vegetables are packaged is kept for a long time so that the effect of ethylene can be sufficiently suppressed. The concentration of carbon dioxide can also be adjusted appropriately, and the freshness of the fruits and vegetables stored and transported can be maintained for a long time.

  As the target fruits and vegetables, all of the fruits and vegetables that have matured by ethylene exhibit a freshness maintaining effect. In particular, it has the property of releasing ethylene and promotes self-ripening, so it is difficult to maintain freshness by simply sealing it. It also has a freshness-retaining effect for apples, pears, oysters and other fruits and vegetables. Demonstrated.

(A) Conceptual diagram of detour route when gas escapes from between inner liner and outer liner, (b) Enlarged view of cross section of seat in (a) Sheet diagram of corrugated cardboard box that can be used in the freshness maintaining form according to the present invention The perspective view of the cardboard box which assembled the cardboard sheet of FIG. Sealing form diagram of cardboard box used for freshness maintaining form according to the present invention The block diagram which incorporated the resin-made buffer sheet which can be used for the freshness maintenance form concerning this invention 5 is a schematic diagram when stored. Schematic of a flask for measuring the amount of permeation of corrugated board used in the examples

The present invention will be described in detail below.
The present invention is a packaging form for maintaining freshness in which fruits and vegetables are packaged in a cardboard box. Here, the packaging form is one in which fruits and vegetables are accommodated in a cardboard which is a package.

  In the packaging form for maintaining freshness according to the present invention, in order to maintain the freshness of the accommodated fruits and vegetables, the drug release powder formulation fixed to cyclodextrin capable of releasing 1-MCP is accommodated in the cardboard box together with the fruits and vegetables. Use. 1-MCP fixed to cyclodextrin begins to be released into the atmosphere in a high humidity environment exceeding about 60 to 90% RH.

The amount (g) of 1-MCP that can be released by the drug-releasing powder preparation needs to be 0.5 ppm or more with respect to an unoccupied volume of 1 m ³ in the cardboard box, and is 1 ppm or more. preferable. If it is less than 0.5 ppm, the effect of suppressing the maturation effect by ethylene is insufficient, and anxiety is caused in maintaining freshness. On the other hand, even if it is too much, no particular effect is exhibited, so it is sufficient if it is 3 ppm or less. Here, the unoccupied volume refers to a volume in which only a gas such as air that is not occupied by an article such as the fruits and vegetables or a resin cushion sheet described later exists. In addition, this dischargeable amount is the maximum value, and the concentration in the box while actually maintaining the freshness is gradually evaporated from 1-MCP and gradually leaks from the cardboard box. It becomes smaller than this maximum value.

  Specifically, a drug-releasing powder preparation containing 1-MCP in an amount corresponding to the above-described releasable amount is encapsulated inside the cardboard box. The method of encapsulating is not particularly limited, such as taking out from a sealed bag and putting it in a volatilizable bag, or opening a volatilization port of a package containing a preparation.

  The cardboard box needs to have an internal and external carbon dioxide exchange rate of 15% or more after 1 hour, and is preferably 16.5% or more. Here, the inside / outside exchange rate is a volume rate of a gas component flowing out to the outside after n hours among predetermined gas components originally present inside the box. If it is less than 15%, the exchange of carbon dioxide does not proceed sufficiently, and there is a high risk that the fruits and vegetables will fall into anaerobic breathing due to excessive accumulation of carbon dioxide inside the cardboard box. On the other hand, the carbon dioxide exchange rate under the same conditions needs to be 35% or less, and is preferably 32% or less. If the exchange rate exceeds 35%, it will virtually not stay inside the box, so that water vapor will not accumulate and 1-MCP may not be released.

  Further, the above-mentioned corrugated cardboard box needs to have an internal / external 1-MCP exchange rate of 11% or more after 1 hour, and is preferably 13% or more. If it is less than 11%, the sealing property is too high, and there is a risk of causing trouble in other parts. On the other hand, it needs to be 42% or less, and preferably 39.5% or less. If it exceeds 42%, the amount of 1-MCP remaining inside the cardboard box is too small, and the effect of 1-MCP on fruits and vegetables cannot be sufficiently expected.

  The form of the cardboard box that achieves such a gas permeation amount is not particularly limited, but a liner (inner liner) on the inner surface side of a double-sided cardboard or a double-sided cardboard passes water vapor, carbon dioxide, and 1-MCP. If it is not difficult, the above exchange rate is difficult to achieve.

Specifically, the water vapor permeability of the inner liner is preferably 10 g / m ² · 24 h or more, and more preferably 20 g / m ² · 24 h or more. This is because if the water vapor hardly permeates, condensation easily proceeds. On the other hand, preferably the water vapor permeability of the inner liner is not more than 300g ^/ m 2 · 24h, more preferably is not more than 200g ^/ m 2 · 24h. This is because if the water vapor permeates too much, the humidity inside the cardboard box does not rise in a short time, and the release of 1-MCP may not be started or may be gradually released and not rise to a predetermined concentration.

The carbon dioxide permeability of the inner liner is preferably 10 ml / m ² · 24 h or more, and more preferably 20 ml / m ² · 24 h or more. This is because if carbon dioxide hardly permeates, carbon dioxide accumulates inside the cardboard box and the fruits and vegetables may fall into anaerobic breathing. On the other hand, preferably the carbon dioxide permeability of the inner liner is not more than 400ml ^/ m 2 · 24h, more preferably is not more than 250ml ^/ m 2 · 24h. This is because the carbon dioxide permeability correlates with the water vapor permeability to some extent, and if the carbon dioxide escapes too much, the water vapor escapes too much.

Further, preferably the 1-MCP permeability of the inner liner is not more than 300ml ^/ m 2 · 24h, more preferably is not more than 250ml ^/ m 2 · 24h. This is because if 1-MCP permeates too much, the effect on fruits and vegetables is hardly exhibited. In addition, since there is almost no adverse effect on fruits and vegetables as much as 1-MCP is present, the lower the permeability, the better. However, it is realistic that it is 20 ml / m ² · 24 h or more.

  The inner liner is preferably coated in order to obtain the above-described transmittance value. Although it will not specifically limit as this coating if water vapor permeability is suppressed to said range, For example, the coating agent containing an inorganic filler and binder resin can be used.

  Examples of the inorganic filler used in such a coating agent include talc, mica, clay, calcium silicate, calcium carbonate, and magnesium carbonate.

  Examples of the binder resin include styrene butadiene copolymer resin, styrene acrylic acid copolymer resin, and styrene acrylonitrile butadiene copolymer resin.

  The mass mixing ratio of these inorganic fillers and binder resin is preferably 1.5: 1 to 1: 1.5. If there are too many inorganic fillers and the binder resin is insufficient, a coating film cannot be formed sufficiently, and the gas permeability of the corrugated base paper will be too high. On the other hand, if the binder resin is too much, the gas bypass effect in the filler portion in the coating film is insufficient and the gas permeability is too high.

  Such a coating agent containing an inorganic filler and a binder resin may contain other components as long as gas permeation is not inhibited more than necessary in the present invention.

  Further, contrary to the inner liner 2, the outer liner 3 is preferably relatively permeable. When the inner liner 2 has low permeability, the water vapor S, carbon dioxide C, and 1-MCP avoid the surface of the inner liner 2, and the corrugated portion of the inner core between the inner liner 2 and the outer liner 3. Enters between the liners from the exposed cross section 5a. This state is shown in FIG. Water vapor, carbon dioxide, and 1-MCP that have entered from the cross-section 5a can pass through the outer liner 3 and the inner shin 4 and escape to the outside. However, since the thickness of the cross section is thin and the cross section is not exposed to the inside of the cardboard box except for the cross section 5a at the tip of the inner flap 5, the amount of slipping out can be suppressed.

  In order to exhibit such an effect, the thickness of the corrugated cardboard sheet is preferably 2 mm or more, and more preferably 4 mm or more. On the other hand, if it is too thick and the amount of permeation is too large, it becomes impossible to control, so it is preferably 8 mm or less, more preferably 5 mm or less. In addition, in this thickness range, both sides of the A flute, B flute, C flute, E flute corrugated cardboard as defined in JIS Z 0104, and one side of these A flute, B flute, C flute, E flute A double-sided cardboard in which cardboard is bonded can be used.

In the case of the above outer liner, intermediate shin, and double-sided corrugated cardboard, the water vapor permeability of the intermediate liner is preferably 300 g / m ² · 24 h or more. In addition, since the above-mentioned thickness is limited, there is no particular problem with the high permeability of the outer liner and the inner lining, but it is realistic that it is 2000 g / m ² · 24 h or less.

Further, in the case of the above outer liner, intermediate shin, and double-sided cardboard, the carbon dioxide permeability of the intermediate liner is preferably 400 ml / m ² · 24 h or more. Since the above-mentioned thickness is limited, there is no particular problem with the high permeability of the outer liner and the inner shin, but it is realistic that it is 2100000 ml / m ² · 24 h or less.

Furthermore, in the case of the above outer liner, intermediate shin, and double-sided cardboard, the 1-MCP permeability of the intermediate liner is preferably 300 ml / m ² · 24 h or more. In addition, when it is said water vapor permeability and carbon dioxide permeability, it is realistic that 1-MCP permeability is 1600000 ml / m < ² > * 24h or more.

  Moreover, it is preferable that the cardboard box that achieves such a gas permeation amount has other gaps closed as much as possible. As shown in FIG. 2, the arrival point 15 of the slot 14 forming the upper and lower flaps (inner flap 11 and outer flap 12) of the corrugated cardboard sheet 10 is closer to the front end of the flap than the folding line 13 of the flap. If it is located, the gap generated at the corner 17 of the cardboard box 16 can be closed (FIG. 3).

  The cardboard box for packaging fruits and vegetables in the form of keeping freshness according to the present invention may include not only the cardboard sheet but also an exterior and interior. The exterior includes a tape that seals between the flaps and covers a part of the surface in contact with the outer liner. In addition, the interior is provided on the inner side of the inner liner, such as a resin cushioning sheet, a paper sheet, or a cover on the inner surface.

  The tape 18 suitable for the outer packaging of the cardboard box 16 may be applied, for example, between the abutted outer flaps of the cardboard box (18a in FIG. 4), the side and inner sides of the outer flap. When a sealable tape is applied between the side surface 19 straddling the folding line of the flap (18b in FIG. 4), a useless gap generated in the cardboard box can be closed, and permeation can be blocked by the outer liner. Can be limited to those that pass.

  As another method for closing the gap between the top and bottom outer flaps, as shown in the block diagram of FIG. 5 and the perspective view of FIG. The method of providing the resin-made buffer sheet 31 which consists of a resin raw material which has a buffer effect between these, or both of them is mentioned. In particular, a higher installation effect can be obtained by installing on the open top surface side than on the bottom surface side which can be blocked to some extent by the weight of the fruits and vegetables themselves.

  The width of the resin cushion sheet 31 is preferably substantially the same as the width of the inner flap 11. The length is not particularly limited, but the closer to the width of the outer flap 12, the more preferable it is because the position is less likely to be displaced by an impact received during transportation. That is, the closer to the size of the top and bottom surfaces, the better. When the resin cushion sheet is used to close the gap, the function of ensuring the sealing performance is required, so that the porous type and the net type are not suitable. On the other hand, an excessively thin sheet having no buffering property is likely to be deformed during transportation, and a protective effect of fruits and vegetables cannot be expected. Therefore, a sheet or corrugated sheet having an air layer or bubbles therein is more preferable.

  The resin buffer sheet 31 covers at least 80% of the area of the gap 34 between the inner flaps 33 on the top surface, and is provided between the fruits and vegetables 30 and the top surface of the cardboard box. It is preferable. This is because if it is less than 80%, the blocking effect cannot be sufficiently expected. On the other hand, it is preferable that the covering area is 99.9% or less with respect to the area of the gap 34 so that even a small amount of carbon dioxide or water vapor can go to the top surface. In addition, the part which does not cover the clearance gap may be not only a form having a short length but also a form having a hole on the sheet surface, and is not particularly limited.

The internal volume of the corrugated cardboard box is not particularly limited, but if it is 0.001 m ³ or more, the present invention can be carried out almost without problems. On the other hand, if it exceeds 2 m ³ , it is too large and it is difficult to achieve the above condition, and therefore it is preferably 2 m ³ or less.

  As the fruits and vegetables capable of carrying out the present invention, those containing water corresponding to the water vapor necessary for initiating the release of 1-MCP from the drug release powder formulation can be suitably applied. For example, apple, pear, banana, blue plum, broccoli, pear, oyster, peach, melon, tomato, nectarine, plum, apricot, kiwifruit, avocado, mango, papaya, pineapple, guava, date palm, cucumber, cabbage, lettuce , Carrots, pumpkins, and the like. Among them, the effect of 1-MCP is sufficiently exhibited when used for fruits and vegetables that have an action of releasing ethylene and promote maturation by themselves. In addition, in the case of fruits and vegetables having a relatively low water content or fruits and vegetables having a relatively small water release amount, it is preferable to use after supplementing water separately in order to accelerate the start of volatilization of 1-MCP.

The environment inside the cardboard box constituting the present invention is preferably such that the concentration (volume) of 1-MCP is maintained at 0.5 ppm or more with respect to the volume 1 m ³ where the cardboard box is not occupied. . This is because if it is less than 0.5 ppm, the effect of suppressing the action by ethylene may be insufficient. This concentration is preferably reached within 1 hour after completion of packaging, and more preferably it can be reached within 30 minutes. If it is too dark, there are not many harmful effects, but if it is too much, it is useless, so it is preferably 3 ppm or less.

  The environment in the corrugated cardboard box constituting the present invention should have a humidity of at least 60% RH, preferably 90% RH or more in order to release 1-MCP. This humidity needs to be reached at least by the time the release starts. The humidity of the above condition is preferably reached within 1 hour from the completion of packaging, and more preferably the humidity of the above condition is reached within 30 minutes. When the time to reach the predetermined humidity exceeds 1 hour, 1-MCP is gradually released from the preparation, and as a result, the target 1-MCP concentration may not be reached or the 1-MCP concentration may not be maintained for the predetermined time.

  The environment in the cardboard box constituting the present invention preferably has a carbon dioxide concentration of less than 4%, more preferably less than 2%, and even more preferably less than 1%. If it exceeds 4%, the anaerobic breathing performed by the fruits and vegetables becomes a scale that cannot be ignored and the quality tends to deteriorate. Therefore, it is desirable to always maintain this environment during the storage period.

Hereinafter, the present invention will be specifically described with reference to examples of the present invention.
First, the drugs and materials used will be described.

<Inorganic filler>
・ Mica (Made in Beijing Houxin Trading Co., Ltd: 350-D, average particle size 25 μm)
・ Heavy calcium carbonate (Shiraishi Calcium Co., Ltd .: BF300, average particle size 8 μm)
<Binder resin>
-SBR (styrene butadiene rubber) latex emulsion (Asahi Kasei Chemical Co., Ltd .: L-4700, solid content 50%)
<Others>
Aminosilane coupling agent (manufactured by Shin-Etsu Chemical Co., Ltd .: KBM603, active ingredient 98% or more)

  Using the above materials, 50 parts by mass of muscovite, 5 parts by mass of heavy calcium carbonate, 100 parts by mass of SBR latex emulsion, and 0.5 parts by mass of aminosilane coupling agent were blended to prepare a coating material.

<Cardboard box>
In either case, the material is a corrugated cardboard sheet (manufactured by Rengo Co., Ltd .: liner base paper RKA210, medium shin KSR120, total thickness 5 mm, liner thickness 0.2 mm). Except as otherwise noted, the above-mentioned paint is applied only to the inner liner surface so that the coating amount after drying with a Mayer bar is 20 g / m ² (in some embodiments 15 or 25 g / m ² ). And processed base paper was obtained. The dimensions of each cardboard box are as follows. In addition, all the slots forming each flap are stopped 6 mm before the folding line, and no hole is formed at the corner.
-Corrugated cardboard box A (JIS 0201 type for 10 kg. 455 mm wide x 300 mm long x 190 mm high, gap between flaps in the top surface: 155 mm x 300 mm = 465 cm ² = 0.0465 m ² , opening ratio: 16.6%)
・ Cardboard box B (JIS 0201 type for 5 kg, width 455 mm × length 300 mm × height 120 mm, gap between top flaps: 155 mm × 300 mm = 465 cm ² = 0.0465 m ² , opening ratio: 20.5%)

In some examples and comparative examples, one sheet of the following resin cushioning sheet was laid on the top and bottom of the fruits and vegetables, that is, the position in contact with the top surface and the bottom surface to form part of the interior of the cardboard box. The outer flap surface of the cardboard box filled with fruits and vegetables, the sheet, and the following powder formulation was sealed with I-shape to make a part of the exterior of the cardboard box (only 18a in FIG. 4 was pasted, 18b was pasted) Absent.).
<Resin cushion sheet>
Sheet (manufactured by Marusan Kasei Co., Ltd .: Komachi net, corrugated sheet type. Water vapor permeability is 28 g / m ² · 24 h, carbon dioxide permeability is 156 ml / m ² · 24 h, 1-MCP permeability is 134 ml / m ²・ 24h, width 440mm x length 310mm x thickness 3-8mm)
<Tape (sealing material)>
・ Tape (Nitto Denko CS System Co., Ltd .: Dumplon tape No.375, 50 mm width, PP base material)

<Powder formulation>
1-MCP-releasing cyclodextrin preparation (Rohm and Haas: Smart Fresh (registered trademark), the mass content of 1-MCP in the preparation is 0.014% (the content of 1-MCP in 0.40 g of the powder preparation) The amount is 0.056 mg, and the amount of 1-MCP generated as gas is 0.023 ml.))
<Vegetables>
・ Pear (variety: Kosui)
・ Apple (variety: Shinano Gold)
・ Oysters (variety: Saya Tone)

Each measured value was measured by the following procedure.
<Carbon dioxide permeability of corrugated board>
A corrugated base paper 45 serving as a sample was placed at the opening of a flask 445 ml having a flange 42 shown in FIG. 7 and sealed with tape 46. Carbon dioxide is injected from the inlet 43 so that the concentration in the flask becomes 1%, and the gas in the flask is analyzed by gas chromatography every hour, and the carbon dioxide permeability is calculated from the degree of concentration decrease. did.

<1-MCP permeability of corrugated board>
Corrugated cardboard paper was similarly installed in the opening of the flask shown in FIG. 1-MCP was injected so that the concentration in the flask was 2.4 ppm, and the gas in the flask was analyzed by gas chromatography every hour, and the 1-MCP permeability was calculated from the degree of concentration decrease. .

<Water vapor permeability of corrugated cardboard>
Measured according to JIS Z 0208 “Moisture permeability test method for moisture-proof packaging material (cup method)”.

<CO2 exchange rate of cardboard boxes>
Carbon dioxide is injected into each cardboard box of a predetermined volume so that the concentration becomes 1%, and the gas in the box is analyzed by gas chromatography every hour, and the carbon dioxide exchange rate is calculated from the degree of decrease in concentration. did.

<1-MCP exchange rate of cardboard box>
1-MCP is injected into each cardboard box of a predetermined volume so that the concentration becomes 2.4 ppm, and the gas in the box is analyzed by gas chromatography every hour, and 1-MCP is exchanged from the degree of decrease in concentration. The rate was calculated.

<Temperature and humidity in the box>
A temperature / humidity sensor RSH-1010 manufactured by Especmic Co., Ltd. was installed at the corner in the center of the box, and this was connected to a recorder RS-11 to measure temperature and relative humidity.

( Reference Example 1)
A cardboard box B was produced from a cardboard sheet having an inner liner coating amount of 20 g / m ² . Table 1 shows the water vapor permeability, carbon dioxide permeability, and 1-MCP permeability of the corrugated base paper. Table 1 shows the ventilation rate in the empty box of the assembled cardboard box. Pears were accommodated in a single row in this box. The assumed volume calculated by approximating the shape of the pear as a sphere was 6803 cm ³ , and the volume of fruits and vegetables with respect to the box volume was 41.5%. Moreover, after adding 0.40g of 1-MCP powder formulation, the inner flap and the outer flap on the top surface were closed, and the space between the outer flaps was sealed with tape. In calculation, the theoretical maximum concentration of 1-MCP with respect to the volume in the box not occupied by fruits and vegetables when the total amount of 1-MCP (0.023 ml) is released is 2.4 ppm. Unless otherwise specified, RKA210 was used as the outer liner, and KSR120 was used as the inner liner.

  The box was left in the dark at 30 ° C. and 55% RH. After 30 minutes from standing, the humidity in the box reached 90% RH, and after 40 minutes from standing, the concentration of 1-MCP reached 0.5 ppm. Thereafter, 1-MCP rose to a peak concentration of 1.5 ppm, and 0.5 ppm or more was maintained for 3 hours and 20 minutes. Further, during that period, the maximum value of carbon dioxide stayed at 0.7% and never reached 4%. After 7 days, when the freshness of the pear was confirmed by the presence or absence of browning of the skin and flesh, none of them was observed, and the freshness was good.

( Reference Example 2)
Except that the coating amount of the coating material is increased from 20 g / ^{m 2} to 25 g / ^{m 2} in Reference Example 1 was subjected to the same tests. The results are shown in Table 1. Although the maximum value of the carbon dioxide concentration slightly increased, the freshness could be maintained substantially as in Reference Example 1.

( Reference Example 3)
In Reference Example 1, instead of applying a paint to the inner liner, the inner liner was a corrugated cardboard (made by Rengo Co., Ltd .: Polylock) using a sand laminated polyethylene film (thickness 40 μm). The same experiment was conducted including The results are shown in Table 1. Although the concentration of carbon dioxide was slightly lower than that of Reference Example 1 and the concentration of 1-MCP was slightly decreased, the freshness could be maintained in the same manner.

(Example 1 )
The same test was performed except that the coating amount of the paint in Reference Example 1 was reduced from 20 g / m ² to 15 g / m ² and resin cushion sheets were disposed on the top and bottom surfaces. The results are shown in Table 1. Although the concentration of carbon dioxide was slightly lower than that of Reference Example 1 and the concentration of 1-MCP was slightly decreased, the freshness could be maintained in the same manner.

(Example 2 )
In Reference Example 1, a similar test was performed except that resin cushion sheets were provided on the top and bottom surfaces. All the ventilation rates fell compared with the reference example 1, and while the 1-MCP density | concentration rose rapidly, the carbon dioxide density rose. However, the maximum value of the carbon dioxide concentration was well within the allowable range, and the freshness could be maintained as well. In addition, the ventilation rate in an empty box is a value at the time of excluding a pear and arranging the resin-made buffer sheets.

(Example 3 )
In Reference Example 2, the same test was performed except that resin-made buffer sheets were arranged on the top and bottom surfaces. All the ventilation rates fell compared with the reference example 1, and while the 1-MCP density | concentration rose rapidly, the carbon dioxide density rose. However, the maximum value of the carbon dioxide concentration was well within the allowable range, and the freshness could be maintained as well.

(Example 4 )
In Reference Example 3, the same test was performed except that resin cushion sheets were provided on the top and bottom surfaces. All the ventilation rates fell compared with the reference example 1, and while the 1-MCP density | concentration rose rapidly, the carbon dioxide density rose. However, the maximum value of the carbon dioxide concentration was well within the allowable range, and the freshness could be maintained as well.

( Reference Example 4 )
In Reference Example 1, when the same test was performed by changing the pear to an apple, the freshness could be maintained for the apple in the same manner as in Reference Example 1.

(Example 5 )
In Example 3 , when the same test was performed with the pear changed to oysters, the oysters were able to retain freshness in substantially the same manner as in Reference Example 1.

(Example 6 )
In Example 2 , the box was changed from the cardboard box B to the cardboard box A, and doubled as a 10 kg box. The assumed volume calculated by approximating the pear shape as a sphere was 13606 cm ³ , and the volume of fruits and vegetables with respect to the box volume was 52.5%. Although the concentrations of 1-MCP and carbon dioxide were relatively high, the concentration of 1-MCP could be maintained over a long period of time, and the freshness could be maintained as well.

(Comparative Example 1)
In Example 2 , when the same test was conducted except that a general corrugated cardboard sheet in which no paint was applied to the inner liner was used, the ventilation rate was 100%. As a result, although the carbon dioxide concentration was low, the water vapor concentration did not increase and the release of 1-MCP became slow, and 1-MCP all flowed out within 1 hour, and the freshness of the pear could not be maintained.

(Comparative Example 2)
In Example 1 in which the coating amount of the moisture-proof paint was reduced, when the same test was performed by removing the resin cushion sheets on the top and bottom surfaces, the ventilation rate became too high, and 1-MCP was A sufficient concentration of the released product could not be maintained, and the freshness of the pear could not be maintained.

(Comparative Example 3)
In Reference Example 3, when the same test was conducted except that the same polyethylene film (thickness 40 μm) was laminated to the outer liner as well as the inner liner, the ventilation rate was too low. Since the carbon dioxide concentration exceeded 4%, the freshness of the pear could not be maintained.

(Comparative Example 4)
In Example 4 , when the same test was performed except that the processed base paper coated on the substrate surface was used so that the coating amount after drying the paint on the outer liner was 13 g / m ² , the ventilation rate was Since it became low and the carbon dioxide concentration exceeded 4%, the freshness of the pear could not be maintained.

DESCRIPTION OF SYMBOLS 1 Cardboard box 2 Inner liner 3 Outer liner 4 Middle shin 5 Inner flap 5a Section 6 Outer flap 10 Cardboard sheet 11 Inner flap 12 Outer flap 13 Folding line 14 Slot 15 Reach point 16 Cardboard box 17 Corners 18a, 18b Tape 19 Side 30 Fruits and vegetables 31 Resin cushioning sheet 32 Corrugated cardboard box 33 Inner flap 34 Inner flap clearance 41 Flask 42 Flange 43 Inlet 45 Base paper 46 Tape C Carbon dioxide S Water vapor

Claims (3)

Was Uchifu releasable agent 1-methylcyclopropene, a package for retaining the freshness of vegetables and fruits to be stored in the cardboard box,
As the above cardboard box,
As an interior, at least one resin cushion sheet covering 80% or more and 99.9% or less of the gap area between the inner flaps on the top surface is provided between the fruits and vegetables and the top surface,
As an exterior, it has a sealable tape that seals the surface of the outer flap,
1-methylcyclopropene exchange rate inside and outside after 1 hour is 11% or more and 42% or less,
It is characterized by using an airtight corrugated cardboard box in which the exchange rate of carbon dioxide inside and outside after 15 hours is 15% or more and 35% or less,
Freshness package of fruits and vegetables. The cardboard sheet constituting the airtight cardboard box is
The inner liner on the inside of the box has a water vapor permeability of 10 g / m ² · 24 h to 300 g / m ² · 24 h, a carbon dioxide permeability of 10 ml / m ² · 24 h to 400 ml / m ² · 24 h, 1- Methylcyclopropene permeability is 300 ml / m ² · 24 h or less,
The outer liner and medium shin which are outside the box have a water vapor permeability of 300 g / m ² · 24 h or more, a carbon dioxide permeability of 400 ml / m ² · 24 h or more, and a 1-methylcyclopropene permeability of 300 ml / m ² · 24h or more,
Freshness package according to claim 1 having the structure. The reaching point of the slot notch forming the upper and lower flaps of the corrugated cardboard sheet is located closer to the front end of the flap than the folding line of the flap,
As the exterior, a sealable tape is applied between the abutted outer flaps of the cardboard box and between the side of the outer flap and the folding line of the inner flap, respectively.
Freshness package according to claim 1 or 2.

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