JP2022152507A - Garden stuff freshness-keeping package - Google Patents

Abstract

To provide such a package enabling reducing operations required for packaging broccoli, also reducing necessary facilities as well as material as much as possible, and exhibiting a high freshness-keeping effect.SOLUTION: A freshness-keeping package is formed by: putting a packaging bag, which is made of a synthetic resin film exhibiting air permeability and stores a plurality of broccoli stocks, into an outer packaging box exhibiting air permeability; and folding an upper portion including an opening port of the packaging bag so as to make a ratio F/B of an area F of a portion overlapped with the synthetic resin film with respect to a bottom area B of the outer packaging box, 0.35 or more and 1.2 or less.SELECTED DRAWING: Figure 1

Description

The present invention relates to a freshness-preserving package for preserving the freshness of fruits and vegetables.

By including a carbon dioxide generating agent or an oxygen generating agent in a package for storing and transporting fruits and vegetables, the oxygen concentration and carbon dioxide concentration inside the package are adjusted, and the freshness of fruits and vegetables is maintained for a long period of time. Attempts to retain are common. For example, Patent Document 1 proposes a freshness preservation method in which broccoli or cauliflower is placed in a semi-sealed container, a carbon dioxide generating agent or an oxygen generating agent is included, and the oxygen concentration and carbon dioxide concentration are kept at predetermined values. ing.

As another method of preserving freshness, the package is provided with appropriate air permeability to control gas exchange between the inside and outside, and the carbon dioxide concentration, oxygen concentration, and water vapor content of the environment in which the fruits and vegetables are placed can be adjusted. There is also a method to keep the freshness of packaged fruits and vegetables longer than unwrapped or sealed packaging.

In Patent Document 2, a film is perforated so that the total perforation area is 0.4 to 4.0 mm ² /kg with respect to the weight of fruits and vegetables to be packaged, and the ratio of the hole diameter to the film thickness is 3 or more and 50 A technique has been proposed for vacuum precooling sealed packaged fruits and vegetables by adjusting as follows. It is claimed that by ensuring an appropriate oxygen concentration and keeping the carbon dioxide concentration low, it is possible to prevent putrefaction and respiration, and prevent the formation of water droplets.

In Patent Document 3, holes having an average diameter of 30 μm or more and 800 μm or less are provided in a freshness-preserving packaging bag used for edamame or broccoli by a laser irradiation device, and oxygen transmission amount P1 at 40 ° C. and 90% RH, 5 ° C., A method of adjusting the ratio P1/P2 to the oxygen permeation amount P2 at 90% RH to a predetermined value has been proposed.

Japanese Patent No. 2931885 Japanese Patent No. 3346002 Japanese Patent No. 6265054

However, in the method of using a carbon dioxide generating agent or an oxygen generating agent as in Patent Document 1, although the freshness preservation effect can be expected while the gas continues to be sufficiently generated from the generating agent, the generated gas is exhausted. And the freshness preservation effect can no longer be expected. Also, the packaging must have limited breathability so that the generated gas does not become excessive inside and can maintain a certain concentration. For this reason, both gas generants and packaging with highly controlled air permeability are required. In a package that is less costly than the contents, such a method that requires both elements tends to increase the cost and is not preferable.

In addition, in order to seal and package fruits and vegetables with breathable film, equipment for sealing (pack sealer, heat sealer, etc.) and manual packaging work such as rubber band stoppers are required, which increases capital investment costs. or require skilled personnel. In particular, in the case of group packaging in which the contents to be sealed exceed 1 kg per package, a large and expensive equipment is required to carry out the packaging, and if done manually, it will take time and increase production. In some cases, there was also a decrease in sexuality.

On the other hand, if you try to use individual packaging instead of collective packaging, you will need one package for each content, which not only increases the cost of packaging materials, but also increases the amount of storage per box when packed in an outer box. will decrease, and transportation efficiency will decrease. In addition, it takes a lot of time and effort to manually pack the contents one by one, resulting in a marked decrease in productivity.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a package that reduces the work required for packaging broccoli, requires as little equipment and materials as possible, and provides a high freshness-keeping effect.

In the present invention, a film bag made of a breathable synthetic resin film containing a plurality of strains of broccoli is packed in a breathable exterior box,
The upper part including the opening of the packaging bag is folded, and the ratio F/B between the area F of the overlapping part of the synthetic resin film and the bottom area B of the outer box is 0.35 or more and 1.2 or less. The above problem was solved by the freshness-preserving package.

By collectively packaging multiple strains of broccoli, labor and time can be greatly reduced compared to individual packaging. As a condition for achieving both moderate air permeability and gas retention in this single packaging bag, by folding so that F / B is in the above range, broccoli It is possible to demonstrate the gas exchange performance that can maintain the freshness of the food.

In the freshness-preserving package according to the present invention, the number of broccoli contained is 3 or more and 40 or less,
The opening area ratio R to the external area of the outer box is 0.001% or more and 60% or less,
The gas exchange rate E of the synthetic resin film at 23° C. and 60% RH is 0.1×10 ⁵ cc/m ² ·day·atm or more and 1.2×10 ⁵ cc/m ² ·day·atm or less. Embodiments can be employed.

If the number of stored broccoli is within this range, the effect of preserving freshness can be exhibited while maintaining high productivity. However, if the outer box of the freshness-preserving package itself has too high or too low air permeability, it will cause problems. A range is preferred. In addition, not only the folded portion of the packaging bag, but also the synthetic resin film itself has a predetermined air permeability, so that it is possible to control the state more suitable for keeping freshness.

An embodiment in which the thickness of the synthetic resin film is 15 μm or more and 60 μm or less can be adopted for the freshness-preserving package according to the present invention.

In particular, when the exterior box is made of a cardboard box, an embodiment in which the opening area ratio R is 0.001% or more and 30% or less can be preferably adopted.

With the freshness-preserving package according to the present invention, it is possible to quickly and easily produce a mass package containing a large amount of broccoli. In addition, since broccoli can be produced easily by hand without the burden of capital investment such as the introduction of large-scale equipment, it is possible to greatly reduce the labor and cost of shipping broccoli. The broccoli packed in this freshness-preserving package can be transported and stored while maintaining its freshness, and can be suitably shipped from the place of production to the place of consumption while being stored in the outer box.

FIG. 2 is a partially transparent perspective view of the freshness-preserving package according to the present invention; (a) A view of folding the upper part including the opening in the manufacturing procedure of the freshness-preserving package according to the present invention, (b) A view of the state in which the synthetic resin films are overlapped by folding the upper part FIG. 2 is a plan view showing an overlapping portion of the upper surface of the packaging bag of the freshness-preserving package according to the present invention; (a) Cross-sectional view showing an example in which the overlapping portion of the top surface of the packaging bag of the freshness-keeping package is 30% (0.3), (b) The overlapping portion of the top surface of the packaging bag of the freshness-keeping package is 70% (0.3). 7) Cross-sectional view showing an example, (c) Cross-sectional view showing an example in which the freshness-preserving package overlaps the upper surface of the packaging bag by 120% (1.2)

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to embodiments. The present invention is a freshness-preserving package used for packaging broccoli.

A freshness-retaining package 1 according to the present invention is a film bag 11 made of an air permeable synthetic resin film containing a plurality of stocks of broccoli 2 and packed in an air permeable exterior box 15.例文帳に追加

The number of broccoli to be stored is preferably 3 or more, more preferably 6 or more. Such collective packaging can reduce the cost of the film bag and the labor required for storage and boxing. With two stocks, not only is it less time-consuming than individual packaging, but it may also take more time than individual packaging when packing in an outer box, which poses a problem in terms of work efficiency. On the other hand, the number of strains is preferably 40 or less, more preferably 36 or less. If too many broccoli are packed in one freshness-preserving package, the outer box becomes large and heavy, making it difficult to handle manually, and many broccoli are piled up in the box, which easily damages the broccoli. may become

The freshness-preserving package 1 according to the present invention is obtained by folding the upper part including the opening 12 of the packaging bag, placing it on the stored broccoli 2, and packing it inside the exterior box 15.例文帳に追加FIG. 1 shows a perspective view of an example in which a cardboard box is used as the exterior box 15. As shown in FIG. By folding the upper part of the bag and packing it into a box, the opening 12 can be closed without particularly requiring secondary materials or equipment for sealing the opening of the bag. Such a simple packaging operation exhibits a sufficient freshness-preserving effect.

Although the material of the synthetic resin film that constitutes the film bag 11 is not particularly limited, it does not have an adverse effect on the broccoli 2, and it is difficult to open the opening 12 for storage or to store the broccoli. Polyolefin films such as polyethylene and polypropylene are preferably used from the viewpoints of ease of handling, safety at the time of disposal after use, and cost. Among them, a polyolefin film having antifogging properties is particularly preferable because it can suppress the adhesion of water droplets that cause spoilage of the broccoli 2 caused by condensation of water vapor released from the broccoli 2 during transportation and storage.

The thickness of the synthetic resin film is preferably 15 μm or more, more preferably 20 μm or more. If the thickness is less than 15 μm, the perforated film, which will be described later, may be easily torn, and it may be difficult to keep the size of the perforated portion generated by the tear within a suitable range. On the other hand, it is preferably 60 μm or less, more preferably 50 μm or less. If the thickness exceeds 60 μm, not only is it difficult to form a perforated portion having a suitable shape using a perforating needle, which will be described later, but there is also a possibility that it will be difficult to penetrate.

It is desirable that the synthetic resin film itself also has air permeability. This is because the air permeability tends to be insufficient only with the folded portion. As a structure for ensuring air permeability, there is a structure in which holes having the required number and size are perforated with a hot needle, a laser beam, or a non-heated needle after the film is manufactured.

Among the above structures to ensure the ventilation of the synthetic resin film, when adopting a film perforated by a hot needle or laser beam, the heat applied during perforation cools and solidifies the molten resin around the perforation, so the perforation The shape is stable, and it is easy to control the target gas exchange rate E. In addition, since the resin in the perforated portion solidifies after being melted, film residue is less likely to occur, and there is almost no risk of foreign matter adhering to the housed broccoli 2 . On the other hand, if the hole area is too large, the number of holes will be reduced in order to adjust the air permeability to an appropriate level. have a nature. In addition, the processing speed must be suppressed in order to control variations in hole shape and pitch, resulting in a decrease in productivity and an increase in cost.

Among the above structures for ensuring the breathability of the synthetic resin film, it is particularly preferable to employ a film perforated with non-heated needles. In this case, since a small hole area of about 0.0007 to 0.004 mm ² can be used, the number of holes per unit area can be increased, and gas can be exchanged over a wide range of the film bag. Therefore, even if the broccoli to be stored increases the volumetric ratio and the film bags are closely attached to each other, the holes that contribute to gas exchange can be sufficiently secured, so that the gas exchange performance as a whole is not easily affected. In addition, since the pore area is small, the film can be used without impairing its appearance, and even if there is printing on the film, the display will not be disturbed, and there is no problem in terms of appearance. In the case of perforating, by using an instrument that contacts and rotates the surface of the roll that conveys the film, perforations can be made throughout without reducing the processing speed, which is also excellent in terms of manufacturing efficiency. there is In addition, when piercing with an unheated needle, film residue is generated and there is a slight possibility that it will adhere to the stored broccoli, but broccoli is rarely eaten raw, and it should be boiled or washed before cooking. Therefore, even if film residue remains, it can be removed at this time, so there is no practical problem.

The synthetic resin film used for the film bag of the present invention has a gas exchange rate E of 0.1×10 ⁵ cc/m ² ·day in an environment of 23° C. and 60% RH, regardless of which method is used. ·atm or more, preferably 0.3×10 ⁵ cc/m ² ·day·atm or more. If it is less than 0.1×10 ⁵ cc/m ² ·day·atm, the air permeability becomes insufficient, and there is a high possibility that the freshness of the broccoli 2 stored in the bag cannot be sufficiently maintained. On the other hand, the gas exchange rate E of the synthetic resin film is preferably 1.2×10 ⁵ cc/m ² ·day·atm or less, and is preferably 1.0×10 ⁵ cc/m ² ·day·atm or less. and more preferred. If the air permeability is too high, even if the broccoli is stored in the bag, it will be too close to being exposed to the outside air, and the freshness preserving effect will not be exhibited.

The film bag 11 made of such a synthetic resin film can be formed by a general bag-making method. For example, a relatively small bag can be made by folding a synthetic resin film at the bottom of the bag and heat-sealing or fusing the left and right sides. In the case of a relatively large bag, it is possible to form a bag by stacking two sheets, heat-sealing or cutting three sides, and opening the remaining one side. Among these, the embodiment is not particularly limited, but a rectangular bag with closed three sides and an open mouth 12 at the top can be preferably used for folding in the present invention at a low cost.

To manufacture the freshness-preserving package 1 according to the present invention, as shown in FIG. . As a procedure for making this form, the broccoli 2 may be stored in the film bag 11 outside the outer box 15 and then packed in the outer box 15, or the film bag 11 may be spread inside the outer box 15. Broccoli 2 may be placed inside and packed in a box.

The opening 12 side of the film bag 11 is folded, and the film bag 11 is put on the upper part of the broccoli 2 so that the films overlap each other. By creating a state that is not completely sealed, work can be performed without the need for secondary materials or equipment for sealing. In addition, such a simple packaging operation can exhibit a sufficient effect of preserving freshness. This folded state is shown in FIG. 2(b). In the freshness-preserving package 1 according to the present invention, the ratio F between the area F of the overlapping portion of the synthetic resin film on the upper side of the film bag 11 when the opening 12 is folded and the bottom area B of the exterior box 15 /B must be 0.35 or more, preferably 0.5 or more. If F/B is less than 0.35, the folded portion is too small, and the degree of sealing of the opening 12 by the film bag 11 becomes insufficient, resulting in excessive gas exchange. A conceptual diagram of the area F of the portion where the synthetic resin films overlap is shown in FIG. 3(a). A conceptual diagram of the bottom area B of the exterior box 15 is shown in FIG. 3(b).

FIG. 4 shows a conceptual cross-sectional side view of the state in which the synthetic resin films are overlapped. FIG. 4(a) shows a situation where the overlapping portion is about 30%, that is, F/B=0.3. The overlapping part is rather small, and the gas inside is in a situation where it is too easy to escape. FIG. 4(b) shows a situation where the overlapping portion is about 70%, that is, F/B=0.7. The upper surface is fully covered with a double overlap, making it difficult for the gas inside to escape. FIG. 4(c) shows a situation where F/B is about 1.2, where the overlapping portion exceeds 100% and part of the side portion also overlaps.

On the other hand, F/B is preferably 1.2 or less, more preferably 1.0 or less. A situation exceeding 1.0 indicates that the overlapping portion of the synthetic resin film extends not only to the upper side of the film bag 11 but also to the side of the exterior box 15 . If F/B exceeds 1.2, the overlapping portion is too large and the synthetic resin film is wasted too much. In addition, if the remaining portion is large, the depth from the opening 12 to the storage portion is too large, and there is a possibility that the workability when storing the broccoli will be deteriorated.

The freshness-preserving package 1 according to the present invention combines the air permeability that is slightly exhibited in the gap of the opening 12 folded so as to fall within the above value range and the air permeability of the synthetic resin film itself, Provides good breathability. However, the exterior box 15 in which the film bag 11 is packed also has a condition.

The exterior box 15 is a box that has air permeability and can pack the film bag 11 that serves as a collective package containing a plurality of broccoli 2 . The form is not particularly limited, and cardboard boxes, perforated plastic containers (hereinafter referred to as "plastic containers"), wooden boxes, etc. as shown in FIGS. 1 and 2 can be used. The sides of these outer boxes may be formed with a handle hole or a ventilation hole for vacuum precooling as shown in FIG. 1, or may have holes separated by a grid for ventilation. However, it is not preferable to use a box that is an outer frame type case that is completely open on the sides and has only a rectangular parallelepiped frame portion other than the bottom surface. Examples of materials for the outer box 15 include plastic, wood, cardboard, and the like.

Among the forms of the exterior box 15, the plastic container described above has advantages in that it has high durability and reusability, and can be used as a returnable box. In addition, even if a large number of vents are provided, it is easy to maintain the shape and ensure strength. On the other hand, it is rather heavy, requiring labor and transportation costs to collect it for reuse. Moreover, in most cases, it must be washed before reuse, and the labor and cost of washing cannot be ignored.

Among the forms of the exterior box 15, the wooden box described above does not require fossil fuel-derived materials in its manufacture, and thus has the advantage of having a small environmental load. Since the wooden board supports the sides, it is easy to maintain the shape and strength even if the ventilation holes are mainly provided on the sides. On the other hand, the weight of the outer box is very large relative to the contents, which tends to lead to a decrease in workability and an increase in transportation costs. It is naturally possible to reduce the weight by thinning the boards that form the wooden box or reducing the area, but if the area is too small, the contents tend to protrude from the sides during transportation and storage, and the upper part There is a risk that the state of the overlapping portions of the films cannot be maintained.

Among the forms of the exterior box 15, the cardboard box described above can be used hygienically because it is used one-way. In addition, since the material itself has good air permeability, the opening area can be suppressed, and the strength of the box can be easily maintained. Compared to wooden boxes and plastic containers, it is lighter and easier to work with. When not in use, it can be stored in a sheet form, so it does not take up much space in warehouses. Although the box itself is one-way, it has the advantage of being recyclable as a material, and the overall environmental impact is small. In addition, in the freshness-preserving package 1 according to the present invention, the broccoli 2 is packed in the film bag 11, so that the strength of the corrugated cardboard box can be suppressed from being lowered by the steam released from the broccoli.

The opening area ratio R to the external area of the exterior box 15 is preferably 0.001% or more, more preferably 0.01% or more. If it is less than 0.001%, even if the film bag 11 and its opening 12 are breathable, the gas exchange with the outside air is insufficient only by the permeability of the material of the outer box 15, resulting in freshness. It becomes impossible to fully exhibit the retention effect. The outer area mentioned above is the total area of the actual surfaces or virtual surfaces formed by the outer frame portion of the box, which can be regarded as a rectangular parallelepiped. For corrugated cardboard covering 6 sides, even if it has an opening such as a handle hole, it is the sum of the areas of the 6 sides assuming that there is no opening. Do not double add the part where the flap overlaps. For perforated plastic containers and the like, for each side with openings such as ventilation holes, it is the total area of each side assuming that there are no openings. On the other hand, R is preferably 60% or less, more preferably 50% or less. If it exceeds 60%, not only will the film bag 11 protrude and come into direct contact with the outside air, but also the state of the overlapped portion of the upper film cannot be maintained, and the freshness-keeping effect of the freshness-keeping package 1 is achieved. can hardly be demonstrated. For reference, the corrugated cardboard box having a handle hole and a ventilation hole shown in FIG. 1 has an R of 0.5%.

When the exterior box 15 is a cardboard box, the opening area ratio R is more preferably 0.001% or more and 30% or less. Since the corrugated cardboard supports the compressive strength of the box, especially at the side portions, if the R is too high, there is a risk of a problem in terms of strength. On the other hand, as described above, the material itself has high air permeability, so it is easy to ensure air permeability even if there are not so many holes.

In the freshness-preserving package 1 according to the present invention, the ratio of the volume occupied by the broccoli 2 to the volume of the outer box 15 (hereinafter referred to as "volume share") is the same as that of the packing method by one vertical packing as shown in FIG. 50% or more and 80% or less is desirable. If the volume occupation ratio is too low, there is a risk that the broccoli 2 will move and collide with each other during transportation and be damaged, and transportation efficiency will also be poor. On the other hand, if it is attempted to increase the volume occupancy of the broccoli 2 to exceed 80% by arranging it vertically, it will be difficult unless the flower buds are forcibly deformed, and the broccoli 2 will be easily damaged. The broccoli 2 is mainly eaten, and the flower bud part has a shape in which many irregularities overlap intricately. Refers to the assumed excluded volume, which for standard broccoli 2 is approximately 1000-1500 cm ³ . On the other hand, when each broccoli 2 is laid on its side and packed in two stages so that flower buds and stems alternate, the volume occupation ratio is desirably 65% or more and 85% or less. If it is less than 65% in two-stage packing, the transport efficiency is too low. On the other hand, if the broccoli 2 is packed more than 85% even in two-tiered packing, the broccoli 2 is forced to deform, and the broccoli 2 is also easily damaged.

In the freshness-preserving package 1 according to the present invention, the space necessary for packing the broccoli 2, that is, the area including the upper end and outer periphery of the flower bud 3 and the lower end of the stem 4 in the volume V ₀ of the outer box 15 _The ratio of the coverable rectangular parallelepiped space V1 occupied (referred to as "space volume ratio") is desirably 80% or more and 95% or less in the case of a single vertical arrangement. Moreover, in the case of two-tiered alternate packing, the spatial volume ratio is preferably 85% or more and 97% or less. In either packing method, if the amount of broccoli 2 is too small, a space will be wasted in the upper part of the exterior box 15, resulting in poor transportation efficiency. On the other hand, if it is too large, it may become difficult to seal the top surface of the outer box 15, and when the outer boxes are stacked, the flower buds of the broccoli may be subjected to a load.

By using the freshness-preserving package 1 according to the present invention for packaging, transporting, and storing broccoli 2, it is possible to maintain freshness for a long time while appropriately exchanging gas inside and outside the package. Since it is collective packaging and there is no need to mechanically seal the opening 12, even a large amount of broccoli 2 can be efficiently packaged.

Next, the present invention will be described more specifically with reference to examples in which the present invention was actually carried out.

The following synthetic resin films were prepared for use in film bags. These were perforated with a heated needle, a laser, and a non-heated needle so as to meet the specifications shown in Table 1, which will be described later. However, the perforation using an unheated needle is slit-shaped, and the hole diameter indicates the length of the slit. A perforated film or a non-perforated film was cut into the dimensions shown in Table 1, and three sides were heat-sealed to form a film bag.
・ Anti-fogging biaxially stretched polypropylene film (“Anti-fogging OPP” in the table): 25 μm thick, manufactured by Futamura Chemical Co., Ltd.: AF-642S
・ Low-density polyethylene film (“LLDPE” in the table): 20 μm thick, manufactured by Mitsui Chemicals Tohcello Co., Ltd.: TUX-HC-E

<Gas exchange rate E measurement>
Using each film, four sides were heat-sealed to prepare a bag of 150 mm×180 mm, and a syringe nozzle for sampling was attached avoiding the perforated portions of the perforated film. Next, the nozzle was used to deaerate the bag with an aspirator, and then the bag was filled with 750 cc of nitrogen gas (purity of 99.99% or higher) using a gas syringe. Immediately after filling with nitrogen gas, 1 cc of the gas in the bag was sampled, and the oxygen concentration was measured by gas chromatography (TCD detector) equipped with a packed column, and the value was defined as the initial oxygen concentration (C ₀ ). After that, the bag was stored in a constant temperature and humidity chamber set at 23° C. and 60% RH, and the oxygen concentration in the bag was measured after 30 minutes, 1 hour, 2 hours, and 3 hours from the start of storage. Measured by chromatography. All measurements were performed in the atmosphere. In the measured values obtained, it was confirmed that there was a proportional relationship between the elapsed time and the oxygen concentration in the bag (correlation function of 0.98 or more). Assuming that the oxygen concentration in the air is 21%, the gas exchange rate E of the entire air in the bag was calculated by the following formula using the measured value of the oxygen concentration in the bag after 3 hours from the start of storage.
E=(C _t −C ₀ )/C ₀₂ ×V/t/s/P (1)
However, each symbol is as follows.
E: Gas exchange rate (cc/m ² · day · atm)
C _t : Oxygen concentration (%) in the bag after t hours from nitrogen gas filling
C ₀ : Oxygen concentration in bag immediately after nitrogen gas filling (%)
_CO2 : Oxygen concentration in air (21%)
V: Amount of filled nitrogen gas (750 cc)
t: Elapsed time from gas filling (3hr=0.125day)
s: inner surface area of bag (0.054 m ² )
P: atmospheric pressure at the time of measurement (1 atm)

In addition, the following was prepared as an exterior box.
Cardboard box (1): manufactured by Rengo Co., Ltd., inner dimensions 450 mm x 320 mm x 240 mm (B = 450 x 320 = 144,000 mm ² ), external area = 688,000 mm ² , opening area = 87,000 mm ² , Opening area ratio R = 13%
Cardboard box (2): manufactured by Rengo Co., Ltd., internal dimensions: 300 mm × 210 mm × 200 mm (B = 300 × 210 = 63,000 mm ² ), external area = 350,000 mm ² , opening area = 18 mm ² , opening area Ratio R = 0.005%
・Plastic container: MB-20F manufactured by Gifu Plastic Industry Co., Ltd., internal dimensions: 474 mm × 315 mm × 292 mm (B = 460 × 315 = 149,310 mm ² ), external area = 924,000 mm ² , opening area = 465, 000 mm ² , opening area ratio R=50%
・Wooden box: made of pine, internal dimensions 460 mm × 330 mm × 250 mm (B = 460 × 330 = 151,800 mm ² ), external area = 915,000 mm ² , opening area = 660,000 mm ² , opening area ratio R = 72%
Styrofoam box: HA-40 manufactured by Sekisui Plastics Co., Ltd., internal dimensions 427 mm × 340 mm × 250 mm (B = 427 × 340 = 145,180 mm ² ), external area = 1,127,000 mm ² , opening area = 0 mm ² , opening area ratio R = 0%

<Evaluation based on the difference in air permeability of film bags>
(Examples 1 to 4, Comparative Examples 1 and 2)
Using an anti-fogging biaxially oriented polypropylene film as a synthetic resin film, a film perforated with a hot needle (Example 1), a laser (Example 2), or a non-heated needle (Examples 3 and 4, Comparative Example 1), or perforated A film bag made of a film (Comparative Example 2) that has not been wrapped is spread inside an outer box whose bottom is pasted with craft adhesive tape (TGK-KTKC50, manufactured by Otsuka Shokai Co., Ltd.) and stuffed with broccoli. 12 strains of 3×4 strains as shown in 1 were aligned vertically. After that, the film on the upper part of the bag was folded, and the area F of the overlapping portion of the film was described in Table 1 as "overlapping area F". In Examples 3 and 4, and Comparative Example 1, in which the same non-heated needle was used to perforate, the bag dimensions decreased in this order, and the overlapping area F when folded decreased in this order. The upper part of the folded film was pressed with the upper flap of the corrugated cardboard box, which was the exterior box, and the upper flap was pasted together with the craft adhesive tape to seal. The freshness-preserving packages thus obtained were stored in a thermo-hygrostat set at 20° C. and 50% RH for 6 days, and the quality of the broccoli was evaluated. As a standard, ◯ indicates that there is no discoloration or offensive odor, △ indicates that either discoloration or offensive odor can be slightly confirmed, and x indicates that at least one of discoloration or offensive odor can be clearly confirmed.

In Examples 1 to 4, the freshness preserving effect was favorably exhibited regardless of the type of perforation method. On the other hand, in Comparative Example 1, in which the F/B was lowered by reducing the size of the bag and reducing the area F of the upper overlapping portion, the freshness-keeping effect was insufficient probably because air permeability was too high. . In Comparative Example 2 using a non-perforated film bag having no air permeability, the broccoli was clearly discolored and smelled bad, and freshness was not maintained.

<Evaluation based on the difference in the outer box>
(Example 5, Comparative Examples 3-5)
In Example 5, in which a plastic container having ventilation holes on the sides was used as the exterior box and a film bag with laser perforation was used, the effect of preserving the freshness of broccoli was favorably exhibited. On the other hand, in Comparative Example 3, in which a wooden frame with an excessively large opening area ratio R was used instead of the plastic container in Example 5, the wooden frame supported the film bag filled with broccoli before examining the air permeability. As a result, the broccoli protruded from the wooden frame without being able to do so, it was not possible to maintain the shape of the freshness-preserving package when the opening was folded, and it became impossible to control the air permeability. confirmed. In Comparative Example 4, in which styrene foam having an open area ratio R of 0% and no air permeability was used for the exterior box, it was confirmed that the broccoli deteriorated clearly. In Comparative Example 5, in which the broccoli was packaged only in a film bag without being packed in an outer box, it was not possible to maintain the shape in which the opening was folded, and the air permeability could not be controlled. Checked and freshness was not preserved.

<Evaluation in small boxes>
(Example 6, Comparative Example 6)
As Example 6, a small corrugated cardboard box was used as an outer box, and a film bag pierced with an unheated needle was used to obtain a freshness-preserving package. On the other hand, in Comparative Example 6, in which the same cardboard box was used and a non-perforated low-density polyethylene film bag was used, ventilation could not be ensured, and discoloration and an offensive odor were observed in part of the broccoli.

1 Freshness-preserving package 2 Broccoli 3 Flower bud 4 Stem 11 Film bag 12 Open mouth 15 Outer box B Bottom area of outer box F Area of overlapping part

Claims (5)

A film bag made of a breathable synthetic resin film containing multiple strains of broccoli is packed in a breathable exterior box,
Freshness preservation, wherein the ratio F/B of the area F of the portion where the synthetic resin film overlaps and the bottom area B of the outer box is 0.35 or more and 1.2 or less. package. The number of stored broccoli is 3 or more and 40 or less,
The opening area ratio R to the external area of the outer box is 0.001% or more and 60% or less,
The gas exchange rate E of the synthetic resin film at 23° C. and 60% RH is 0.1×10 ⁵ cc/m ² ·day·atm or more and 1.2×10 ⁵ cc/m ² ·day·atm or less. The freshness-preserving package according to claim 1. 3. The freshness-preserving package according to claim 2, wherein the synthetic resin film is a perforated polyolefin film having a thickness of 15 μm or more and 60 μm or less. 4. The freshness-preserving package according to claim 2, wherein the exterior box is a cardboard box, and the opening area ratio R is 0.001% or more and 30% or less. A packaging bag containing multiple strains of broccoli in a bag made of breathable synthetic resin film is packed in a breathable exterior box, the upper part including the opening of the packaging bag is folded, and the synthetic resin film overlaps. A method for producing a freshness-preserving package of broccoli, wherein the ratio F/B of the area F of the outer box to the bottom area B of the outer box is 0.35 or more and 1.2 or less.

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