How to maintain the freshness of cut flowers after they have been picked.

Abstract

To provide a package containing flowers and a method of maintaining freshness of cut flowers after hydration, which prevent discoloration of packaged flowers such as hydrated cut flowers, prevent formation of water droplets inside a bag during transportation, storage, and display, allow the contained flowers to appear attractive, and suppress deterioration in freshness of flowers such as hydrated cut flowers.SOLUTION: A package containing flowers for maintaining freshness of hydrated cut flowers is obtained by sealing hydrated cut flowers in a bag formed of a specific plastic film, wherein the film preferably has an oxygen permeability in a range of 1,000 cm3 / m2 / day atm to 10,000 cm3 / m2 / day atm and a water vapor permeability in a range of 10 g / m2 day to 100 g / m2 day. A method of maintaining freshness of hydrated cut flowers includes a step of preparing hydrated cut flowers, a step of placing the cut flowers in a bag made of the specific plastic film to form a package, and a step of maintaining the package under specific conditions.

Description

[Technical Field]

[0001] This invention relates to a package containing flowers. More specifically, it relates to a package containing flowers that preserves the freshness of flowers, in which cut flowers, after being hydrated, are placed in a bag made of a specific plastic film and sealed. Furthermore, the present invention relates to a method for maintaining the freshness of cut flowers after they have been taken to water. More specifically, the present invention relates to a method for maintaining the freshness of cut flowers after they have been taken to water, comprising the steps of preparing cut flowers after they have been taken to water, placing the cut flowers in a bag made of a specific plastic film to form a package, and maintaining the package under specific conditions. [Background technology]

[0002] Fruits, vegetables, and flowers maintain their life activities as living organisms even after harvesting, aerobically breaking down sugars and organic acids within them to produce the energy necessary for life. A typical reaction is respiration, which produces carbon dioxide, water, and energy from sugar and oxygen, and respiration and transpiration continue. Therefore, fruits, vegetables, and flowers consume energy through their own respiration during storage and distribution after harvest, causing a decline in freshness, and various methods have traditionally been used to maintain their freshness.

[0003] Plastic films are widely used as packaging materials for fruits, vegetables, and flowers due to their excellent transparency, high mechanical strength, superior printability, bag-making processability, and filling workability. However, plastic films have poor permeability to gases such as oxygen, carbon dioxide, ethylene gas, and water vapor. This can lead to insufficient oxygen for maintaining the freshness of fruits, vegetables, and flowers, and can also result in a decline in their freshness because carbon dioxide and ethylene gases generated by the fruits, vegetables, and flowers cannot be released to the outside.

[0004] Therefore, methods have been proposed to provide plastic films with the necessary gas permeability to maintain the freshness of fruits, vegetables, and flowers, in accordance with the respiration of these plants. For example, methods have been proposed that use films made of specific resins (see Patent Document 1), lamination of films with different functions (see Patent Document 2), formation of fine holes in the film (see Patent Document 3), stretching of the film (see Patent Document 4), and inclusion of a photocatalyst in the film that efficiently decomposes ethylene gas generated from fruits, vegetables, and flowers (see Patent Document 5).

[0005] Furthermore, methods have been proposed to supply water and nutrients to plants through the cut end in order to maintain the freshness of plants such as flowers. For example, a device for preserving the freshness of cut flowers has been proposed (see Patent Document 6), which consists of a water-retaining material made of pulp cotton (made by crushing pulp into a cotton-like material), a cut flower freshness-preserving agent, and water, along with a specific bag. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Patent No. 3524126 [Patent Document 2] Japanese Patent Publication No. 2021-049657 [Patent Document 3] Patent No. 6358372 [Patent Document 4] Japanese Patent Publication No. 2009-096119 [Patent Document 5] Japanese Patent Publication No. 2022-022479 [Patent Document 6] Official Gazette No. 3174887 [Overview of the project] [Problems that the invention aims to solve]

[0007] The prior art described in Patent Document 1 proposes a film made of a mixture of EEA, 4MIP, and unsaturated carboxylic acid-modified polyolefin as a method for providing a film that exhibits a CA effect without suffocation even when fruits and vegetables with high respiration rates are sealed and packaged, thereby maintaining freshness. Although the specification mentions flowers, there are no examples of this film being used on flowers, and it is unclear whether it is effective in maintaining the freshness of flowers. Furthermore, the prior art described in Patent Document 2 proposes a film or packaging for maintaining the freshness of fruits and vegetables consisting of a seal layer mainly made of a propylene-based random copolymer and a gas-permeable resin, and a base layer mainly made of a polypropylene-based resin and a gas-permeable resin. However, using two types of films with different functions is not only complicated from a manufacturing standpoint, but also presents the problem of high film costs.

[0008] The prior art described in Patent Document 3 proposes a method for providing a freshness-preserving packaging bag for fresh produce that can adapt to changes in the storage conditions of fresh produce. This involves a film having holes of a specific average diameter at a specific ratio. However, creating a specific number of holes of a specific average diameter in the film not only increases the film cost, but also complicates the film processing equipment, as the size and number of holes must be changed to control the air permeability depending on the contents. Furthermore, the prior art described in Patent Document 4 proposes a freshness-preserving film that combines appropriate gas permeability and good mechanical properties through stretching without the perforation process proposed in the prior art described in Patent Document 3. However, this freshness-preserving film is a laminated stretched film consisting of linear low-density polyethylene with a specific density and MFR and linear low-density polyethylene with a different density and MFR. Laminating and stretching it complicates the film processing equipment.

[0009] The prior art described in Patent Document 5 proposes a method of incorporating a photocatalyst that efficiently decomposes ethylene gas into a film in order to suppress aging, maturation, and spoilage caused by ethylene gas generated from packaged products. However, challenges in using photocatalysts include the need for specific light conditions, the fact that hydroxyl radicals generated during photocatalytic action can damage plants such as vegetables and fruits, and that the resins constituting the film and container can be decomposed, deteriorated, and discolored. It is difficult to say that this proposal fully solves these problems.

[0010] The prior art described in Patent Document 6 proposes a cut flower freshness preservation device that enables the preservation of cut flowers in a packaged state. This device involves placing a water-retaining material, consisting of a freshness-preserving agent and water, into a specific bag. While this prior art is effective in that the cut ends of the stems are submerged in water, thus extending the vase life of the cut flowers, packaging cut flowers in bags with a specific configuration and structure is not only cumbersome and increases packaging costs, but also undesirable in distribution due to the need to transport water.

[0011] Therefore, the present invention aims to solve the problems of the prior art by providing a flower-containing package that preserves the freshness of flowers, in which cut flowers after being taken to water are placed in a bag made of a specific plastic film and sealed, and a method for preserving the freshness of cut flowers after being taken to water, comprising the steps of preparing cut flowers after being taken to water, placing the cut flowers in a bag made of a specific plastic film to form a package, and maintaining the package under specific conditions. [Means for solving the problem]

[0012] The flower-containing packaging of the present invention is a flower-containing packaging in which cut flowers, after being brought to water, are placed in a bag made of plastic film and sealed, wherein the film has a thickness of 20 μm to 50 μm and an oxygen permeability of 1,000 cm². 3 / m 2 / day·atm~10,000cm 3 / m 2 The range is within / day·atm, and the water vapor transmission rate is 10g / m³.2 · per day~100 g / m 2 · It is characterized by being within the range of per day.

[0013] Furthermore, the packaged product with flowers of the present invention has an inner package area of the packaged product with flowers per 100 g of the flowers in the packaged product with flowers of 300 cm 2 ~7,000 cm 2 It is characterized by being so.

[0014] The method for maintaining the freshness of cut flowers after harvesting of the present invention is a method for maintaining the freshness of cut flowers after harvesting, which is put into a bag formed of a plastic film and sealed, and the film has a thickness of 20 μm to 50 μm, an oxygen permeability of 1,000 cm 3 / m 2 / day·atm~10,000 cm 3 / m 2 / day·atm, and a water vapor permeability of 10 g / m 2 · per day~100 g / m 2 · It is characterized by being within the range of per day.

[0015] Furthermore, the method for maintaining the freshness of cut flowers after harvesting of the present invention has an inner package area of the packaged product with flowers per 100 g of the flowers in the packaged product with flowers of 300 cm 2 ~7,000 cm 2 It is characterized by being so.

[0016] Furthermore, the method for maintaining the freshness of cut flowers after harvesting of the present invention includes a step of adjusting cut flowers after harvesting from a flowering plant body, and the cut flowers have a thickness of 20 μm to 50 μm, an oxygen permeability of 1,000 cm 3 / m 2 / day·atm~10,000 cm 3 / m 2 / day·atm, and a water vapor permeability of 10 g / m 2 · per day~100 g / m 2The method is characterized by including the step of placing the contents into a bag made of plastic film within the range of days, thereby forming a package.

[0017] Furthermore, the present invention relates to a method for maintaining the freshness of cut flowers after they have been brought to water, characterized in that the cut flowers after they have been brought to water include at least one type of flower selected from the group consisting of carnations, roses, chrysanthemums, lisianthus, and foliage. [Effects of the Invention]

[0018] The present invention provides a package containing flowers after watering and a method for maintaining the freshness of cut flowers after watering, which can suppress the deterioration of the freshness of the flowers, prevent discoloration of the package, and allow the flowers inside to appear beautiful without water droplets forming inside the bag during transportation, storage, and display. [Brief explanation of the drawing]

[0019] [Figure 1] These are photographs of a pink standard rose (variety name: Karina) during a vase life test (0, 3, 7, 14, and 17 days after opening) two days after harvesting. [Figure 2] These are photos of the spray carnations "Ekubo" that I purchased, taken during a vase life test (0, 3, 7, 10, 14, 17, and 21 days after opening). [Modes for carrying out the invention]

[0020] The present invention will be described in detail below. The flower-containing packaging of the present invention can be obtained by placing cut flowers, still in their freshly hydrated state, into a bag made of plastic film having a specific thickness and gas permeability and sealing it in that state.

[0021] To maintain the freshness of fruits, vegetables, and flowers during storage, transportation, and in-store display, CA (Controlled Atmosphere) storage, which artificially changes the composition of the air in the storage facility to low oxygen and high carbon dioxide and stores it in combination with refrigeration, and MA (Modified Atmosphere) packaging technology, which creates a state close to CA storage by using packaging materials, have been proposed. Not only have many freshness-preserving films been developed and sold for MA packaging, but freshness-preserving methods using these films have also been proposed and adopted. However, the use of these freshness-preserving films and methods using them is limited to fruits and vegetables. For flowers, the only method used is soaking the cut stems in water containing nutrients, etc. There are no examples of packaging cut flowers directly in bags made of plastic film after water absorption, nor are there any freshness-preserving methods for cut flowers after water absorption that consist of specific processes.

[0022] After diligently investigating methods for preserving the freshness of cut flowers by sealing them in bags made of plastic film after they have been harvested, we were surprised to discover that by sealing cut flowers in bags made of plastic film of a specific thickness and gas permeability, their freshness can be preserved for a long period of time.

[0023] The oxygen permeability of the plastic film forming the packaging of the present invention is 1,000 cc / m². 2 • Daytime ATM ~ 10,000cc / m 2 It is within the range of 1,400cc / m². 2 • Daytime ATM ~ 8,000cc / m 2 • Day ATM is preferred, 2,000 cc / m 2 • Day ATM ~ 6,000cc / m 2 A day atm is even more preferable. Oxygen permeability of 1,000 cc / m³ is desirable. 2 When the oxygen permeability is less than 10,000 cc / m³, fermentation occurs due to anaerobic respiration in the flowers inside the packaging, producing an unpleasant odor and rendering the flowers unsaleable. On the other hand, when the oxygen permeability is 10,000 cc / m³ 2If the shelf life exceeds 1 day·atm, the respiration rate of the flowers inside the packaging cannot be suppressed, leading to a rapid decline in freshness.

[0024] Furthermore, since good appearance is an important point in enhancing the commercial value of the flowers inside the packaging, it is also necessary to control the water vapor permeability of the plastic film forming the packaging of the present invention. The water vapor permeability is 10 g / m². 2 • Day ~ 100g / m 2 It must be within the daily limit. 15g / m² 2 • Day ~60g / m² 2 • Day is preferred, 20 g / m² 2 • Day ~40g / m² 2 • Day is even more preferable. Water vapor transmission rate of 10 g / m³ 2 When the water vapor permeability is less than 100 g / m³, more water is generated by the respiration of the flowers inside the packaging, causing the inside of the packaging to become humid, water droplets to adhere to the packaging, making the flowers inside difficult to see and reducing the product's value. On the other hand, when the water vapor permeability is 100 g / m³, 2 If left for more than a day, moisture will evaporate from the flowers inside the packaging, causing them to wilt.

[0025] Furthermore, since carbon dioxide emitted from flowers significantly affects their growth and flowering, controlling the amount of carbon dioxide in the packaging is important for maintaining freshness. The carbon dioxide permeability of the plastic film forming the packaging for flowers according to this invention is 10,000 cc / m². 2 • Day ATM ~20,000cc / m 2 A range of 11,000 cc / m² is preferred. 2 • Daytime ATM ~ 18,000cc / m 2 •day·atm is even more preferable, 12,000cc / m 2 • Daytime ATM ~ 16,000cc / m 2 •day·atm is particularly preferred. Lower carbon dioxide permeability is preferable because it increases the amount of carbon dioxide in the packaging, suppressing the metabolic activity of flowers, inhibiting aging, and delaying flowering, but 10,000cc / m 2When the carbon dioxide level falls below 20,000 cc / m³, the increase in carbon dioxide reduces the freshness of the flowers, which is undesirable. On the other hand, a carbon dioxide permeability of 20,000 cc / m³ is undesirable. 2 When the temperature exceeds 1 / day·atm, the effect of suppressing aerobic respiration in flowers and delaying their growth, thereby preserving the quality of the flowers, diminishes.

[0026] Furthermore, since ethylene gas emitted from flowers causes aging, maturation, and decay, controlling ethylene gas is important for maintaining the freshness of flowers. From the standpoint of maintaining the freshness of flowers inside the packaging, a low ethylene gas concentration inside the packaging is preferable, and for this purpose, a high ethylene permeability of the plastic film forming the packaging is desirable. However, in order to balance the permeability of carbon dioxide, oxygen, and water vapor as explained above, the ethylene permeability of the plastic film forming the packaging of the present invention is 1,000 cc / m². 2 • Day atm or higher is preferable, and 1,500 cc / m 2 More preferably 2,000cc / m² or higher. 2 • Day ATM or higher is especially preferred.

[0027] The material of the plastic film forming the packaging of the present invention is not particularly limited, and any film that satisfies the specific gas permeability characteristic of the present invention can be used as appropriate. For example, polyethylene, polypropylene, polystyrene, nylon, polyethylene terephthalate, polylactic acid, etc. can be used, but polypropylene is preferred in terms of transparency, strength, heat sealability, etc. The plastic film of the present invention may be either an unstretched film or a stretched film, or a film to which inorganic substances or the like have been vapor-deposited, and may be subjected to printing, stretching, and anti-fogging treatment.

[0028] The thickness of the plastic film forming the packaging of the present invention varies in strength and transparency depending on the material and processing method of the film used, but is preferably 20 μm to 50 μm, more preferably 20 μm to 45 μm, and particularly preferably 25 μm to 40 μm, considering cost and transportability. The film may or may not have holes. If there are holes, there are no particular restrictions on the size or number of holes, but a diameter of 50 μm to 500 μm and 1 hole / m² is preferable. 2 ~10,000 pieces / m 2 It is preferable.

[0029] The internal surface area of ​​the flower-containing packaging of this invention is 300 cm² per 100 g of flowers. 2 ~7,000cm 2 Preferably, 400cm 2 ~6,500cm 2 It is even more preferable that it be 450cm 2 ~6,000cm 2 It is particularly preferable that the internal surface area of ​​the flower-containing packaging per 100g of flowers be 300cm². 2 If the size becomes smaller, the amount of oxygen necessary to maintain the freshness of the flowers will be insufficient, and carbon dioxide and ethylene gas produced by the flowers will not be released to the outside, causing the freshness of the flowers to decline. On the other hand, the internal surface area of ​​the flower packaging per 100g of flowers is 7,000cm². 2 If the packaging becomes too large, the flowers inside the floral arrangement may look unattractive, and the packaging itself may become unnecessarily large, which is undesirable for the transportation and display of the floral arrangement.

[0030] The present invention provides a method for maintaining the freshness of cut flowers after water uptake, comprising the steps of preparing cut flowers after water uptake from plants in an appropriate flowering state, and preparing the cut flowers to have a thickness of 20 μm to 50 μm and an oxygen permeability of 1,000 cm². 3 / m 2 / day·atm~10,000cm 3 / m 2 The range is within / day·atm, and the water vapor transmission rate is 10g / m³. 2 • Day ~ 100g / m 2 The process includes at least the step of placing the contents into a bag made of plastic film within a certain range (day) to form a package.

[0031] The process of preparing cut flowers from plants in an appropriate flowering state after water uptake involves cutting the stems, removing leaves and thorns, and tying the cut flowers together as needed, after water uptake from the plants in an appropriate flowering state. In the process of forming the packaging, the cut flowers after water uptake must be packaged in a bag made of plastic film to maintain the freshness of the flowers, and then sealed. There are no particular restrictions on the sealing method, but examples include using heat seals, adhesive tape, string, or rubber bands.

[0032] There are no particular restrictions on the flowers that are packaged in the packaging made of plastic film, and these flowers may be individually or in combination of multiple species. In the method for maintaining the freshness of cut flowers after water uptake according to the present invention, at least one type of flower from a plant selected from the group consisting of carnations, roses, chrysanthemums, lisianthus, and foliage is preferably used. [Examples]

[0033] The following are examples of the present invention, but the present invention is not limited thereto.

[0034] The gas permeability of the films in the examples and comparative examples was measured according to JIS K 7126-1 (differential pressure method) at 23°C for carbon dioxide and oxygen permeability, JIS K 7126-1 (differential pressure method) with only the gas type changed for ethylene permeability, and JIS Z 0208 (cup method) at 90%RH for water vapor permeability.

[0035] Evaluation Criteria for Examples The following table shows the results of the physical properties of the examples and comparative examples, with the evaluation criteria for each being as follows. Evaluation Criteria: ◎: Leaves and petals are very firm and the color is very vibrant, ○: Leaves and petals are firm and the color is vibrant, △: Leaves and petals are slightly less firm and the color is beginning to fade, ×: Leaves and petals are no longer firm and the color is faded, ××: Wilted

[0036] Example 1 Two days after harvesting, a pink standard rose (variety name: Karina) was soaked in water for two hours. Next, the rose was cut to a length of 20 cm, and the thorns were removed. One cut rose was placed in a bag (30 cm x 15 cm) made from 25 μm thick Ocelo Fresh film (manufactured by Ocelo Co., Ltd.), and sealed using a heat sealer. The total internal surface area of ​​the Ocelo Fresh #25 film per 100g of rose was 5,550 cm² (both sides combined). 2 The oxygen permeability of the Ocelofresh #25 film at 23°C was 3,300 cc / m². 2 • day • atm, carbon dioxide transmission rate is 14,000 cc / m³ 2 • day·atm, water vapor transmission rate is 25.5 g / m³ 2 • Day, ethylene permeability was 2,400 cc / m³ 2 It was a day ATM. I prepared three bags of the same thing.

[0037] These three bags were stored for 4 days under conditions of average room temperature of 20.5°C, average relative humidity of 50.5%, and a 12-hour photoperiod (fluorescent light approximately 700°C, 1x). After storage, the bags were opened, the roses were removed, the lower ends of the stems were trimmed by 1 cm, and the roses were cultured in a 50 ml centrifuge tube containing 30 ml of distilled water with an antibacterial agent (0.2 g / L 8-hydroxyquinoline sulfate) to perform a vase life test. Vase life was defined as the number of days until the petals wilted or showed significant discoloration, and was averaged across the three roses. The average vase life was 16 days. The condition of the flowers was also visually evaluated on days 7, 14, and 17 of the vase life test. On day 7, the leaves and petals were very firm and the color was very vivid. On day 14, the leaves and petals were still firm and the color was vivid, but compared to day 7, the firmness and vividness of the leaves and petals were slightly diminished. On the 17th day of the test, the leaves and petals lost their firmness and faded in color. The test results are shown in Table 1, and the condition of the roses during the vase life test is shown in Figure 1.

[0038] Example 2 Homopropylene resin pellets (melting point 160°C, MFR 3g / 10min (manufactured by Prime Polymer Co., Ltd.)) were supplied to an extruder, melted and kneaded, and then a film was formed using a T-die film molding machine and a subsequent biaxial stretching machine. The stretching ratio was 4x in the longitudinal direction and 6x in the transverse direction, and the film was formed by sequential biaxial stretching. The oxygen permeability of the obtained 30 μm thick film was 1,400 cc / m². 2 • day • atm, carbon dioxide transmission rate is 12,000 cc / m³ 2 •day·atm, water vapor transmission rate is 23g / m³ 2 • Day, ethylene permeability was 2,300 cc / m³ 2 The test was conducted in the same manner as in Example 1, except that the film constituting the bag used was changed to the homopropylene biaxially oriented film described above. The total inner surface area of ​​the film per 100g of roses was 5,300 cm² on both sides. 2 The results are shown in Table 1.

[0039] Comparative Example 1 A rose vase life test was conducted in the same manner as in Example 1, except that a 30 μm thick polypropylene film, Newhan PP (manufactured by Sagami Rubber Industries Co., Ltd.), was used. The internal area of ​​the film per 100 g of roses was 5,450. The test results are shown in Table 1, and the vase life was 11 days. The condition of the flowers was also visually evaluated on the 7th, 14th, and 17th days of the vase life test. On the 7th day of the test, the leaves and petals were firm and vividly colored, but by the 14th day, they had wilted. Figure 1 shows the condition of the roses during the vase life test. The oxygen permeability of the film was 3,800 cc / m². 2 • day·atm, water vapor transmission rate is 9.1 g / m³ 2 It was a day.

[0040] Comparative Example 2 Pellets of low-density polyethylene resin (melting point 112°C, MFR 3.2g / 10min (manufactured by ENEOS NUC Corporation)) were supplied to an extruder, the supplied resin was melted and kneaded, and a film was formed using an extrusion inflation molding machine. The oxygen permeability of the obtained 25 μm thick film was 10,500 cc / m². 2·day·atm, the carbon dioxide permeability was 30,000 cc / m 2 ·day·atm, the water vapor permeability was 18 g / m 2 ·day. Using the obtained film, a bag similar to that in Example 1 was prepared, and a rose flower retention test was conducted in the same manner as in Example 1. The inner area of the film per 100 g of the rose was 5,500 cm 2 It was. The test results are shown in Table 1.

[0041] Comparative Example 3 A film and a bag were prepared in the same manner as in Comparative Example 1, except that the material of the film used to prepare the bag for packaging roses was changed to high-density polyethylene resin (melting point 130 °C, MFR 2.3 g / 10 min (manufactured by Nippon Polyethylene Co., Ltd.)), and a rose flower retention test was conducted. The inner area of the film per 100 g of the rose was 5,700 cm 2 It was. The test results are shown in Table 1. The oxygen permeability of the obtained inflation film with a thickness of 25 μm was 700 cc / m 2 ·day·atm, the carbon dioxide permeability was 7,000 cc / m 2 ·day·atm, the water vapor permeability was 9 g / m 2 ·day.

[0042] Example 3 A homopolypropylene film was prepared in the same manner as in Example 2, except that a biaxial stretching machine was not used during film formation, and a rose flower retention test was conducted in the same manner as in Example 1. The inner area of the film per 100 g of the rose was 5,300 cm 2 [[ID=二十八]]It was. The test results are shown in Table 1. The oxygen permeability of the prepared film with a thickness of 25 μm was 1,500 cc / m 2 ·day·atm, the carbon dioxide permeability was 18,000 cc / m 2 ·day·atm, the water vapor permeability was 38 g / m 2 ·day, the ethylene permeability was 2,900 cc / m 2 ·day·atm.

[0043] Example 4 A film with 25 holes per meter made by puncturing with a needle on an Osero fresh film with a thickness of 25 μm (manufactured by Osero Co., Ltd.) used in Example 1 was used, and a rose flower holding test was conducted in the same manner as in Example 1. The inner area of the film per 100 g of the rose was 5,200 cm 2 The test results are shown in Table 1. The oxygen permeability of the produced perforated film with a thickness of 25 μm was 9,000 cc / m 2 ·day·atm, the carbon dioxide permeability was 19,000 cc / m 2 ·day·atm, the water vapor permeability was 45 g / m 2 ·day, and the ethylene permeability was 3,000 cc / m 2 ·day·atm 2

[0044] Example 5 A film was produced in the same manner as in Example 3 except that the resin to be used was changed to low-density polyethylene (melting point 112 °C, MFR 3.2 g / 10 min, manufactured by ENEOS NUC Co., Ltd.). Using the obtained film, a rose flower holding test was conducted in the same manner as in Example 1. The inner area of the film per 100 g of the rose was 5,400 cm 2 The test results are shown in Table 1. The oxygen permeability of this film (30 μm) was 7,000 cc / m 2 ·day·atm, the carbon dioxide permeability was 10,500 cc / m 2 [[ID=2」]]·day·atm, the water vapor permeability was 18 g / m 2 ·day, and the ethylene permeability was 850 cc / m 2 ·day·atm

[0045] Comparative Example 4 A rose flower holding test was conducted in the same manner as in Example 1 except that an OPP bag (manufactured by OLPA) which is an anti-fog OPP film with a thickness of 25 μm was used. The inner area of the film per 100 g of the rose was 5,800 cm 2 The test results are shown in Table 1. The oxygen permeability of the film was 700 cc / m<U 2 ·day·atm, the carbon dioxide permeability was 2,900 cc / m 2 ·day·atm, the water vapor permeability was 6.5 g / m​2 • Day, ethylene permeability was 230 cc / m³ 2 It was a day ATM.

[0046] Comparative Example 5 A 35 μm thick homopropylene biaxially oriented film was prepared in the same manner as in Example 2, except that the stretching ratio for sequential biaxial stretching was changed to 5 times in the longitudinal direction and 7 times in the transverse direction. The oxygen permeability of the obtained film was 2,400 cc / m². 2 •day·atm, carbon dioxide transmission rate is 8,200cc / m³ 2 • day·atm, water vapor transmission rate is 5g / m³ 2 The result was 5,600 cm². Using this film, a rose vase test was conducted in the same manner as in Example 1. The internal area of ​​the film per 100g of roses was 5,600 cm². 2 The results are shown in Table 1.

[0047] Comparative Example 6 Using the 25 μm thick anti-fog OPP film (OLPA Co., Ltd.) used in Comparative Example 4, 25 needles were used to pick up 25 needles per square meter in the same manner as in Example 4. 2 A film with holes was prepared. Using this prepared film, a rose vase test was conducted in the same manner as in Example 1. The internal area of ​​the film per 100g of roses was 5,400cm². 2 The results are shown in Table 1. The oxygen permeability of this perforated film was 12,000 cc / m². 2 • day • atm, carbon dioxide transmission rate is 9,000 cc / m 2 •day·atm, water vapor transmission rate is 34g / m³ 2 It was a day.

[0048] Example 6 In Example 1, three cut spray carnations of the purchased variety "Ekubo," cut to a length of 20 cm, were placed in a bag (30 cm x 15 cm) made from 25 μm thick Ocelo Fresh film (manufactured by Ocelo Co., Ltd.). The bag was sealed using a heat sealer and stored at 23°C in the dark for 7 days. After storage, the three bags were opened, the spray carnations were removed, the lower ends of the stems were trimmed back by 1 cm, and the spray carnations were cultured in a 50 ml centrifuge tube containing 30 ml of distilled water with an antibacterial agent (0.2 g / L 8-hydroxyquinoline sulfate). The vase life of the flowers was observed for 21 days. Up to day 10 of the test, the leaves and petals were firm and the color was vibrant, but on day 14, the firmness of the leaves and petals had slightly deteriorated and the color had begun to fade, and on day 21, the stems of two of the cut flowers broke. The test results are shown in Table 2, and the appearance of the spray carnations during the vase life test is shown in Figure 2. The internal area of ​​the film per 100g of spray carnations is 2,750cm². 2 That was the case.

[0049] Comparative Example 7 A vase life test of spray carnations was conducted in the same manner as in Example 6, except that a polypropylene film of the same thickness as used in Comparative Example 1, Newhan PP (manufactured by Sagami Rubber Industries Co., Ltd.), was used. The internal surface area of ​​the film per 100g of spray carnations was 2,700. The test results are shown in Table 2, and the vase life was 14 days. The vase life was also observed for 21 days. Up to the 7th day of the test, the leaves and petals were firm and the colors were vibrant, but on the 14th day, the firmness of the leaves and petals had slightly deteriorated and the colors had begun to fade, and on the 17th day, the stems of about half of the cut flowers had broken. Figure 2 shows the appearance of the spray carnations during the vase life test.

[0050] Comparative Example 8 A homopropylene film with a thickness of 18 μm was prepared in the same manner as in Example 3, and an attempt was made to conduct a vase life test of spray carnations in the same manner as in Example 6. However, the bag tore when a bundle of 10 cut spray carnations was placed in the bag, making it impossible to conduct the vase life test.

[0051] Example 7 A bag (70cm x 96.9cm) made from the 25μm thick Ocelo Fresh film (manufactured by Ocelo Co., Ltd.) used in Example 1 was placed in a bag containing 2,740g of chrysanthemums, two days after harvesting, with the stems cut 2cm from the bottom after being hydrated. The bag was then sealed using a heat sealer. The internal surface area of ​​the film per 100g of chrysanthemums was 495cm². 2 Subsequently, a vase life test of chrysanthemums was conducted in the same manner as in Example 1. The results are shown in Table 3.

[0052] Example 8 Except for changing the weight of the chrysanthemums placed in the bag to 3310g, a bag containing chrysanthemums was prepared in the same manner as in Example 7, and then a vase life test of the chrysanthemums was conducted in the same manner as in Example 7. The results are shown in Table 3. The internal area of ​​the 25μm thick OceloFresh (manufactured by Ocelo Co., Ltd.) film per 100g of chrysanthemums was 410cm². 2 That was the case.

[0053] Example 9 Except for changing the weight of the chrysanthemums placed in the bag to 4270g, a bag containing chrysanthemums was prepared in the same manner as in Example 7, and then a vase life test of the chrysanthemums was conducted in the same manner as in Example 7. The results are shown in Table 3. The internal area of ​​the 25μm thick OceloFresh (manufactured by Ocelo Co., Ltd.) film per 100g of chrysanthemums was 318cm² 2 That was the case.

[0054] Example 10 Except for changing the weight of the chrysanthemums placed in the bag to 4840g, a bag containing chrysanthemums was prepared in the same manner as in Example 7, and then a vase life test of the chrysanthemums was conducted in the same manner as in Example 7. The results are shown in Table 3. The internal area of ​​the 25μm thick OceloFresh (manufactured by Ocelo Co., Ltd.) film per 100g of chrysanthemums was 280cm². 2 That was the case.

[0055] Example 11 Except for changing the weight of the chrysanthemums placed in the bag to 6350g, a bag containing chrysanthemums was prepared in the same manner as in Example 7, and then a vase life test of the chrysanthemums was conducted in the same manner as in Example 7. The results are shown in Table 3. The internal area of ​​the 25μm thick OceloFresh (manufactured by Ocelo Co., Ltd.) film per 100g of chrysanthemums was 214cm² 2 That was the case.

[0056] [Table 1]

[0057] [Table 2]

[0058] [Table 3] [Industrial applicability]

[0059] The present invention relates to a package containing flowers after watering and a method for preserving the freshness of cut flowers after watering. This method involves placing the cut flowers in a bag made of a specific plastic film and sealing it, thereby suppressing the deterioration of the flowers' freshness, preventing discoloration of the package, and ensuring that the flowers inside the bag remain beautifully visible during transport, storage, and display. Therefore, it has the potential to create a new market for flowers.

Claims

1. A method for preserving the freshness of cut flowers after watering, comprising placing the cut flowers, either in their water-retained state or with the stems cut and leaves and thorns removed, into a sealed plastic film bag, wherein the film has a thickness of 20 μm to 50 μm, an oxygen permeability in the range of 1,000 cm³ / m² / day·atm to 10,000 cm³ / m² / day·atm, a water vapor permeability in the range of 10 g / m²·day to 100 g / m²·day, and is designed to prevent water droplets from forming inside the bag during display.

2. The method for maintaining the freshness of cut flowers after harvesting, as described in Invoice 1, is characterized in that the carbon dioxide permeability of the film is in the range of 10,000 cc / m²·day·atm to 20,000 cc / m²·day·atm.

3. The method for maintaining the freshness of cut flowers after watering, according to claim 1 or claim 2, wherein the internal surface area of ​​the flower-containing packaging per 100g of flowers is 300cm² to 7,000cm².

4. The process of preparing cut flowers from a flowering plant after water absorption, wherein the cut flowers have a thickness of 20 μm to 50 μm and an oxygen permeability of 1,000 cm³ / m² / day·atm to 10,000 cm³ / m ２ A method for maintaining the freshness of cut flowers after water absorption according to claim 1 or 2, comprising the step of placing cut flowers, either in their water-absorbing state or with their stems cut and leaves and thorns removed, into a bag made of plastic film having a water vapor permeability of 10 g / m²·day to 100 g / m²·day, which is within the range of / day·atm, and forming a package.

5. The method for maintaining the freshness of cut flowers after watering, according to claim 1 or 2, wherein the cut flowers after watering include at least one type of flower selected from the group consisting of carnations, roses, chrysanthemums, lisianthus, and foliage.

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