Method of maintaining freshness of cut flower after hydration

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] The present invention relates to a package containing flowers, and more particularly to a package containing flowers in which cut flowers after harvesting are placed in a sealed bag made of a specific plastic film, thereby preserving the freshness of the flowers. Furthermore, the present invention relates to a method for maintaining the freshness of water-harvested cut flowers, more specifically, the method comprises the steps of preparing water-harvested cut flowers, 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] Even after harvest, fruits, vegetables, and flowers continue to function as living organisms, aerobicly breaking down the sugars and organic acids within them to generate the energy they need for vital activities. A typical reaction is the respiratory reaction, which converts sugars and oxygen into carbon dioxide, water, and energy, and respiration and transpiration continue. Therefore, during post-harvest storage and distribution, fruits, vegetables, and flowers consume energy through their own respiration, which causes a loss of freshness, and various methods have been developed to maintain freshness.

[0003] Plastic films are widely used as packaging materials for fruits, vegetables, and flowers because of their excellent transparency, high mechanical strength, excellent printability, bag-making processability, and ease of filling. However, plastic films have poor permeability to gases such as oxygen, carbon dioxide, ethylene gas, and water vapor, which can result in an insufficient amount of oxygen necessary to maintain the freshness of fruits, vegetables, and flowers, or prevent the carbon dioxide and ethylene gas generated by fruits, vegetables, and flowers from being released to the outside, resulting in a decrease in the freshness of the fruits, vegetables, and flowers.

[0004] Therefore, methods have been proposed for providing plastic films with the gas permeability required to match the respiration of fruits, vegetables, and flowers, with the aim of preserving the freshness of fruits, vegetables, vegetables, and flowers. For example, methods have been proposed that use a film made of a specific resin (see Patent Document 1), that laminate films with different functions (see Patent Document 2), that form fine holes in a film (see Patent Document 3), that stretch a film (see Patent Document 4), and that incorporate a photocatalyst into a film that efficiently decomposes ethylene gas generated from fruits, vegetables, vegetables, and flowers (see Patent Document 5).

[0005] Furthermore, methods have been proposed for providing water and nutrients to plants through the cut end of flowers and other plants in order to maintain their freshness. For example, a cut flower freshness-keeping device (see Patent Document 6) has been proposed, which comprises a water-retaining material made from pulp cotton (pulp cotton made from crushed pulp), a cut flower freshness-keeping agent, and water, and 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 Application Laid-Open No. 2009-096119 [Patent Document 5] Japanese Patent Publication No. 2022-022479 [Patent Document 6] Publication No. 3174887 Summary of the Invention [Problem to be solved by the invention]

[0007] The prior art described in Patent Document 1 proposes a film made from a mixture of EEA, 4MIP, and unsaturated carboxylic acid-modified polyolefin as a method for providing a film that exhibits CA effects and maintains freshness even when sealed and packaged in a way that prevents suffocation in highly respiring fruits and vegetables. Although the specification mentions flowers, there are no examples of the film being used with flowers, so it is unclear whether it is effective in maintaining the freshness of flowers. Furthermore, the prior art described in Patent Document 2 proposes a freshness-preserving film or package for fruits and vegetables that consists of a sealing layer primarily made of a propylene-based random copolymer and a gas-permeable resin and a base layer primarily made of a polypropylene-based resin and a gas-permeable resin. However, using two types of film with different functions not only complicates production, but also increases the cost of the film.

[0008] The prior art described in Patent Document 3 proposes a film having a specific ratio of holes with a specific average diameter as a method for providing freshness-keeping packaging bags for fruits and vegetables that can adapt to changes in storage conditions for fruits and vegetables. However, drilling a specific number of holes with a specific average diameter in a film not only increases the cost of the film, but also necessitates changing the size and number of holes to control breathability depending on the contents, resulting in complex film processing equipment. Furthermore, the prior art described in Patent Document 4 proposes a freshness-keeping film that combines appropriate gas permeability and good mechanical properties through stretching processing without the perforation processing proposed in the prior art described in Patent Document 3. However, this freshness-keeping film is a laminated stretched film made of linear low-density polyethylene having a specific density and MFR and linear low-density polyethylene having a different density and MFR, and therefore requires complex film processing equipment for lamination and stretching.

[0009] The prior art described in Patent Document 5 proposes a method of incorporating a photocatalyst into a film that efficiently decomposes ethylene gas, with the aim of preventing aging, ripening, and decay caused by ethylene gas emitted from packaged deliverables. Problems with using a photocatalyst include the need for light conditions, and the fact that hydroxyl radicals generated during photocatalytic action can harm vegetables, fruits, and other plants, as well as decomposing, deteriorating, and discoloring the resins that make up the film and container. Therefore, it is difficult to say that this proposal satisfactorily solves these problems.

[0010] The prior art described in Patent Document 6 proposes a cut flower freshness-keeping device that enables cut flowers to maintain their freshness while packaged, in which a water-retaining material composed of water and a freshness-keeping agent effective in maintaining the freshness of cut flowers is placed in a specific bag. This prior art is effective in extending the shelf life of cut flowers because the cut surfaces of the stems of the cut flowers are immersed in water, but packaging cut flowers in a bag with a specific composition and structure is not only cumbersome and expensive, but also requires transporting water, which is undesirable for distribution.

[0011] The present invention aims to solve the problems of the prior art by providing a package containing water-harvested cut flowers that maintains the freshness of the flowers, in which water-harvested cut flowers are placed in a bag made of a specific plastic film and sealed, and a method for maintaining the freshness of water-harvested cut flowers, which comprises the steps of preparing water-harvested cut flowers, 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 package of the present invention is a package containing flowers in which cut flowers after watering are placed in a bag made of plastic film and sealed, and the film has a thickness of 20 μm to 50 μm and an oxygen permeability of 1,000 cm 3 / m 2 / day·atm~10,000cm 3 / m 2 / day·atm and water vapor permeability is 10g / m2 day~100g / m 2 The present invention is characterized in that the period is within the range of 10 days.

[0013] Furthermore, the flower-containing package of the present invention has an internal surface area of ​​300 cm per 100 g of the flower. 2 ~7,000cm 2 It is characterized in that:

[0014] The method of the present invention for preserving the freshness of cut flowers after harvesting is a method for preserving the freshness of cut flowers after harvesting in a package containing flowers, which is made by placing cut flowers after harvesting in a bag made of plastic film and sealing the bag, wherein the film has a thickness of 20 μm to 50 μm and an oxygen permeability of 1,000 cm 3 / m 2 / day·atm~10,000cm 3 / m 2 / day·atm and water vapor permeability is 10g / m 2 day~100g / m 2 The present invention is characterized in that the period is within the range of 10 days.

[0015] Furthermore, in the method for preserving the freshness of cut flowers after harvesting, the surface area of ​​the package containing flowers is 300 cm per 100 g of the flowers. 2 ~7,000cm 2 It is characterized in that:

[0016] Furthermore, the method of the present invention for maintaining the freshness of cut flowers after being harvested from a blooming plant includes the steps of: preparing harvested cut flowers from a blooming plant; 3 / m 2 / day·atm~10,000cm 3 / m 2 / day·atm and water vapor permeability is 10g / m 2 day~100g / m 2and placing the product in a bag made of a plastic film within the range of 100-150 days to form a package.

[0017] Furthermore, in the method for preserving the freshness of cut flowers after being watered of the present invention, the cut flowers after being watered include at least one type of flower plant selected from the group consisting of carnation, rose, chrysanthemum, lisianthus, and foliage plants. [Effects of the Invention]

[0018] The package containing water-harvested flowers and the method for maintaining the freshness of water-harvested cut flowers of the present invention can prevent the loss of freshness of the flowers, prevent discoloration of the package, and prevent water droplets from forming inside the bag during transportation, storage, and display, allowing the flowers inside to look beautiful. [Brief explanation of the drawings]

[0019] [Figure 1] These are photographs of the condition of pink standard roses (variety name: Karina) two days after harvesting during a flower life test (0, 3, 7, 14, and 17 days after opening). [Figure 2] These are photos of the condition of the spray carnation "Ekubo" that I purchased during a cut flower vase life test (0 days, 3 days, 7 days, 10 days, 14 days, 17 days, and 21 days after opening). DETAILED DESCRIPTION OF THE INVENTION

[0020] The present invention will be described in detail below. The flower-containing package of the present invention can be obtained by placing cut flowers in a water-fresh state in a bag made of a plastic film having a specific thickness and gas permeability and sealing the bag.

[0021] To maintain the freshness of fruits, vegetables, and flowers during storage, transportation, and in-store display, several technologies have been proposed, including controlled atmosphere (CA) storage, which artificially changes the air composition in a storage facility to low oxygen and high carbon dioxide levels and combines this with refrigeration, and modified atmosphere (MA) packaging, which uses packaging materials to create a condition within a bag similar to that of CA storage. Many freshness-preserving films have been developed and sold for MA packaging, and other freshness-preserving methods using such films have also been proposed and adopted. However, these films and methods are only used for fruits and vegetables, and for flowers, the cut stems are immersed in water containing nutrients. There have been no examples of freshly-harvested cut flowers packaged in plastic film bags, nor have there been any freshness-preserving methods involving specific processes for freshly-harvested cut flowers.

[0022] As a result of extensive research into methods for preserving the freshness of cut flowers by sealing and packaging water-harvested cut flowers in bags made of plastic film, the present inventors have surprisingly found that the freshness of water-harvested cut flowers can be maintained for a long period of time by sealing the flowers in bags made of plastic film having a specific thickness and gas permeability.

[0023] The oxygen permeability of the plastic film forming the packaging of the present invention is 1,000 cc / m 2 ·day·atm~10,000cc / m 2 1,400cc / m 2 ·day·atm~8,000cc / m 2 ·day·atm is preferred, 2,000cc / m 2 ·day·atm~6,000cc / m 2 ·day·atm is more preferable. Oxygen permeability is 1,000cc / m 2 If the oxygen permeability is less than 10,000cc / m, the flowers inside the package will ferment due to anaerobic respiration, causing an unpleasant odor and making the flowers unsuitable for sale. 2If the storage time exceeds 10 days, the respiration rate of the flowers inside the package cannot be controlled and freshness will decrease significantly.

[0024] Furthermore, since good appearance is an important factor in increasing the commercial value of the flowers contained in the package, it is also necessary to control the water vapor permeability of the plastic film forming the package of the present invention. 2 day~100g / m 2 It is necessary to keep the density within the range of 15g / m 2 day~60g / m 2 ·day is preferred, 20g / m 2 40g / m² 2 10g / m 2 If the water vapor permeability is less than 100g / m², the flowers inside the package will produce more water due to their respiration, causing the inside of the package to become steamy and water droplets to adhere to the package, making it difficult to see the flowers inside and reducing the product value. 2 If the storage time exceeds 10 days, the moisture in the package will evaporate and the flowers will wilt.

[0025] Furthermore, since carbon dioxide generated by flowers has a significant effect on the growth and flowering of flowers, it is important to control the amount of carbon dioxide in the package in order to maintain freshness. The carbon dioxide permeability of the plastic film forming the packaging of flowers of the present invention is 10,000 cc / m 2 ·day·atm~20,000cc / m 2 ·day·atm range is preferable, and 11,000cc / m 2 ·day·atm~18,000cc / m 2 ·day·atm is more preferable, and 12,000cc / m 2 ·day·atm~16,000cc / m 2 A lower carbon dioxide permeability is preferable in that the amount of carbon dioxide in the package increases, suppressing the metabolic activity of flowers, preventing aging, and delaying flowering. 2If the permeability is less than 20,000cc / m², the freshness of the flowers will decrease due to the increase in carbon dioxide, which is undesirable. 2 If the temperature exceeds 100°C / day, the effect of suppressing aerobic respiration of flowers and slowing their growth will be reduced, thereby reducing the effect of preserving the quality of flowers.

[0026] Furthermore, since ethylene gas emitted from flowers causes aging, ripening, and decay of flowers, controlling ethylene gas is important for maintaining the freshness of flowers. From the viewpoint of maintaining the freshness of flowers inside the package, it is preferable that the ethylene gas concentration inside the package is low, and for this purpose, it is preferable that the ethylene permeability of the plastic film forming the package is high. However, from the viewpoint of achieving the permeability of carbon dioxide, oxygen, and water vapor as explained above, the ethylene permeability of the plastic film forming the package of the present invention is 1,000 cc / m 2 ·day·atm or more is preferable, 1,500cc / m 2 ·day·atm or more is more preferable, 2,000cc / m 2 ·day·atm or higher is particularly preferred.

[0027] The material of the plastic film forming the packaging body 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 appropriately. Examples include polyethylene, polypropylene, polystyrene, nylon, polyethylene terephthalate, polylactic acid, etc., but polypropylene is preferred in terms of transparency, strength, heat sealability, etc. The plastic film of the present invention may be either a non-stretched film or a stretched film, or may be a film on which an inorganic substance or the like is vapor-deposited, and may be subjected to printing, stretching, and anti-fogging treatment.

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

[0029] The surface area of ​​the package containing flowers of the present invention is 300 cm per 100 g of flowers. 2 ~7,000cm 2 It is preferable that the 2 ~6,500cm 2 More preferably, it is 450 cm 2 ~6,000cm 2 It is particularly preferable that the area of ​​the interior of the package containing 100 g of flowers is 300 cm 2 If the packaging is smaller than this, the amount of oxygen required to keep the flowers fresh will be insufficient, and the carbon dioxide and ethylene gas generated by the flowers will not be released to the outside, reducing the freshness of the flowers. On the other hand, if the internal surface area of ​​the packaging containing 100g of flowers is 7,000cm, 2 If the size is too large, the appearance of the flowers in the package will be poor and the package will be larger than necessary, which is undesirable for transporting and displaying the package.

[0030] The method for preserving the freshness of cut flowers after being watered of the present invention comprises the steps of preparing cut flowers after being watered from plants in an appropriate blooming state, and then rinsing the cut flowers to a thickness of 20 μm to 50 μm and an oxygen permeability of 1,000 cm 3 / m 2 / day·atm~10,000cm 3 / m 2 / day·atm and water vapor permeability is 10g / m 2 day~100g / m 2 The method includes at least a step of placing the product in a bag made of a plastic film within the range of 100-150 days to form a package.

[0031] The process of preparing cut flowers after water harvesting from plants in a suitable blooming state refers to the work of cutting the stems, removing leaves and thorns, and tying the cut flowers as needed after water harvesting from the plants in a suitable blooming state. In the process of forming packages, the cut flowers after water harvesting must be packaged in bags made of plastic film to maintain the freshness of the flowers, and then sealed. There are no particular limitations on the sealing method, but examples include methods using heat seals, adhesive tape, strings, rubber bands, etc.

[0032] There are no particular limitations on the flowers and plants to be packaged in the packaging made of plastic film, and these flowers and plants may be packaged either alone or in combination. The cut flowers to be packaged in the method for preserving the freshness of cut flowers after watering of the present invention are preferably at least one type of plant flower selected from the group consisting of carnation, rose, chrysanthemum, lisianthus, and foliage. [Example]

[0033] Examples of the present invention will be described below, but the present invention is not limited to these examples.

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

[0035] Evaluation criteria for the examples The following tables show the results of various physical properties of the Examples and Comparative Examples, and the evaluation criteria for the results are as follows: Evaluation criteria: ◎: Leaves and petals are very firm and the color is very vivid; ○: Leaves and petals are firm and the color is vivid; △: Leaves and petals have lost some firmness and are beginning to fade; ×: Leaves and petals have lost their firmness and are faded; XX: Wilted

[0036] Example 1 Pink standard roses (variety name: Karina) were soaked in water for 2 hours on the second day after harvesting. The roses were then 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 a 25 μm thick Othello Fresh (manufactured by Othello Co., Ltd.) film, and sealed using a heat sealer. The internal surface area of ​​the Othello Fresh #25 bag per 100 g of rose was 5,550 cm2 (combined on both sides). 2 The oxygen permeability of the film of Ocello Fresh #25 at 23°C was 3,300 cc / m 2 ·day·atm, carbon dioxide permeability is 14,000cc / m 2 ·day·atm, water vapor permeability is 25.5g / m 2 ·day, ethylene permeability is 2,400cc / m 2 It was a ·day·atm. I prepared three bags of the same thing.

[0037] The three bags were stored for four days under conditions of an average room temperature of 20.5°C, an average relative humidity of 50.5%, and a 12-hour photoperiod (approximately 700 1x fluorescent lighting). After storage, the bags were opened, the roses were removed, and the stems were cut back 1 cm. The roses were then placed in 50 ml centrifuge tubes containing 30 ml of distilled water containing an antibacterial agent (0.2 g / L 8-hydroxyquinoline sulfate) and incubated for a vase life test. Vase life was measured as the number of days until the petals wilted or showed significant discoloration, and was the average for the three roses. The vase life was 16 days. The condition of the flowers was also visually evaluated on days 7, 14, and 17. On day 7, the leaves and petals were very firm and very vibrant in color. On day 14, the leaves and petals were firm and vibrant in color, but the firmness and vividness of the leaves and petals had slightly diminished compared to day 7. On the 17th day of the test, the leaves and petals lost their firmness and their colors faded. The test results are shown in Table 1, and the state of the roses during the vase life test is shown in Figure 1.

[0038] Example 2 Pellets of homopropylene resin (melting point 160°C, MFR 3g / 10min (Prime Polymer Co., Ltd.)) were fed into an extruder, melted and mixed, and then formed into a film using a T-die film forming machine followed by a 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 resulting 30µm thick film was 1,400cc / m 2 ·day·atm, carbon dioxide permeability is 12,000cc / m 2 ·day·atm, water vapor permeability is 23g / m 2 ·day, ethylene permeability is 2,300cc / m 2 The rose vase life test was carried out in the same manner as in Example 1, except that the film constituting the bag used was changed to the above-mentioned homopropylene biaxially stretched film. The internal surface area of ​​the film per 100 g of rose was 5,300 cm2 (total of both sides). 2 The test results are shown in Table 1.

[0039] Comparative Example 1 A vase life test for roses was carried out in the same manner as in Example 1, except that a 30 μm thick polypropylene film called Newhan PP (manufactured by Sagami Rubber Industries Co., Ltd.) was used. The internal surface area of ​​the film per 100 g of roses was 5,450 mm. The test results are shown in Table 1, and the vase life was 11 days. The condition of the flowers was 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 bright in color, but had wilted on the 14th day of the test. The condition of the roses during the vase life test is shown in Figure 1. The oxygen permeability of the film was 3,800 cc / m 2 ·day·atm, water vapor permeability is 9.1g / m 2 ·day.

[0040] Comparative Example 2 Pellets of low-density polyethylene resin (melting point 112°C, MFR 3.2 g / 10 min (manufactured by ENEOS NUC Corporation)) were fed into an extruder, melted and mixed, and then extruded into a film using an inflation molding machine. The oxygen permeability of the resulting 25 μm-thick film was 10,500 cc / m. 2·day·atm, carbon dioxide permeability is 30,000cc / m 2 ·day·atm, water vapor permeability is 18g / m 2 The flower life test for roses was carried out in the same manner as in Example 1 using the same bag as in Example 1 made using the obtained film. The inner area of ​​the film per 100 g of roses was 5,500 cm 2 The test results are shown in Table 1.

[0041] Comparative Example 3 Films and bags were produced in the same manner as in Comparative Example 1, except that the material of the film used to produce bags for packaging roses was changed to high-density polyethylene resin (melting point 130°C, MFR 2.3 g / 10 min (manufactured by Japan Polyethylene Co., Ltd.)), and a rose vase life test was carried out. The internal area of ​​the film per 100 g of roses was 5,700 cm 2 The test results are shown in Table 1. The oxygen permeability of the resulting 25 μm thick inflation film was 700 cc / m 2 ·day·atm, carbon dioxide permeability is 7,000cc / m 2 ·day·atm, water vapor permeability is 9g / m 2 ·day.

[0042] Example 3 A homopropylene film was produced in the same manner as in Example 2, except that a biaxial stretching machine was not used during film production, and a rose vase life test was carried out in the same manner as in Example 1. The internal area of ​​the film per 100 g of the rose was 5,300 cm 2 The test results are shown in Table 1. The oxygen permeability of the 25 μm thick film was 1,500 cc / m 2 ·day·atm, carbon dioxide permeability is 18,000cc / m 2 ·day·atm, water vapor permeability is 38g / m 2 ·day, ethylene permeability is 2,900cc / m 2 ·day·atm.

[0043] Example 4 The 25 μm thick Ocello Fresh film (manufactured by Ocello Co., Ltd.) used in Example 1 was needled at 25 needles / m 2 The rose vase life test was carried out in the same manner as in Example 1, except that a film with holes was used. The internal area of ​​the film per 100 g of roses was 5,200 cm 2 The test results are shown in Table 1. The oxygen permeability of the perforated film with a thickness of 25 μm was 9,000 cc / m 2 ·day·atm, carbon dioxide permeability is 19,000cc / m 2 ·day·atm, water vapor permeability is 45g / m 2 ·day, ethylene permeability is 3,000cc / m 2 ·day·atm.

[0044] Example 5 A film was produced in the same manner as in Example 3, except that the resin used was changed to low-density polyethylene (melting point 112°C, MFR 3.2 g / 10 min (manufactured by ENEOS NUC Corporation)). The obtained film was used to test the longevity of roses in the same manner as in Example 1. The internal area of ​​the film per 100 g of roses 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, carbon dioxide permeability is 10,500cc / m 2 ·day·atm, water vapor permeability is 18g / m 2 ·day, ethylene permeability is 850cc / m 2 ·day·atm.

[0045] Comparative Example 4 A rose vase life test was carried out in the same manner as in Example 1, except that an OPP bag made of a 25 μm thick anti-fog OPP film (manufactured by OLPA) was used. The inner area of ​​the film per 100 g of roses was 5,800 cm 2 The test results are shown in Table 1. The oxygen permeability of the film was 700 cc / m 2 ·day·atm, carbon dioxide permeability is 2,900cc / m 2 ·day·atm, water vapor permeability is 6.5g / m2 ·day, ethylene permeability is 230cc / m 2 ·day·atm.

[0046] Comparative Example 5 A 35 μm thick homopropylene biaxially stretched film was produced in the same manner as in Example 2, except that the stretching ratio in the 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 / m 2 ·day·atm, carbon dioxide permeability is 8,200cc / m 2 ·day·atm, water vapor permeability is 5g / m 2 Using this film, a vase life test for roses was carried out in the same manner as in Example 1. The internal area of ​​the film per 100 g of roses was 5,600 cm 2 The test results are shown in Table 1.

[0047] Comparative Example 6 The same OPP bag (manufactured by OLPA) made of the 25 μm thick anti-fog OPP film used in Comparative Example 4 was used to pinch the film with needles at 25 pins / m in the same manner as in Example 4. 2 Using this film, a rose vase life test was carried out in the same manner as in Example 1. The internal area of ​​the film per 100 g of roses was 5,400 cm. 2 The test results are shown in Table 1. The oxygen permeability of this perforated film was 12,000 cc / m 2 ·day·atm, carbon dioxide permeability is 9,000cc / m 2 ·day·atm, water vapor permeability is 34g / m 2 ·day.

[0048] Example 6 Three purchased cut spray carnations, "Ekubo," cut to 20 cm lengths, were placed in bags (30 cm x 15 cm) made from the 25 μm-thick Ocello Fresh (Ocello Co., Ltd.) film used in Example 1. The bags were sealed with a heat sealer and stored at 23°C in the dark for 7 days. After storage, the three bags were opened to remove the spray carnations. The bottom ends of the stems were cut back 1 cm. The spray carnations were then placed in 50 ml centrifuge tubes containing 30 ml of distilled water containing an antibacterial agent (0.2 g / L 8-hydroxyquinoline sulfate) and cultured. The vase life was observed for 21 days. The leaves and petals remained firm and vibrant until the 10th day of the test. However, by the 14th day, the leaves and petals began to lose some firmness and fade, and by the 21st day, the stems of two 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 carnation is 2,750cm 2 It was.

[0049] Comparative Example 7 A spray carnation vase life test was conducted in the same manner as in Example 6, except that Newhan PP (manufactured by Sagami Rubber Industries Co., Ltd.), a polypropylene film of the same thickness as in Comparative Example 1, was used. The internal surface area of ​​the film per 100 g of spray carnation was 2,700 mm. The test results are shown in Table 2, and the vase life was 14 days. The vase life was also observed for 21 days. Until the 7th day of the test, the leaves and petals were firm and the color was vivid, but by the 14th day of the test, the leaves and petals had lost some of their firmness and the color had begun to fade, and by the 17th day of the test, the stems of approximately half of the cut flowers had broken. The state of the spray carnations in the vase life test is shown in Figure 2.

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

[0051] Example 7 A bag (70 cm x 96.9 cm) made from the 25 μm thick Ocello Fresh (manufactured by Ocello Co., Ltd.) film used in Example 1 was placed with 2,740 g of daisy-shaped flowers, cut 2 cm below the stem after harvesting and then placed in a heat sealer. The internal surface area of ​​the film per 100 g of daisy-shaped flowers was 495 cm. 2 Thereafter, a flower life test for the daisies was carried out in the same manner as in Example 1. The results are shown in Table 3.

[0052] Example 8 Bags containing daisy flowers were prepared in the same manner as in Example 7, except that the weight of the daisy flowers to be placed in the bag was changed to 3,310 g, and then the flower life test for the daisy flowers was carried out in the same manner as in Example 7. The results are shown in Table 3. The internal area of ​​the 25 μm-thick Ocello Fresh (manufactured by Ocello Co., Ltd.) film per 100 g of daisy flowers was 410 cm 2 It was.

[0053] Example 9 Bags containing daisy flowers were prepared in the same manner as in Example 7, except that the weight of the daisy flowers placed in the bag was changed to 4,270 g, and then the flower life test for the daisy flowers was carried out in the same manner as in Example 7. The results are shown in Table 3. The internal area of ​​the 25 μm-thick Ocello Fresh (manufactured by Ocello Co., Ltd.) film per 100 g of daisy flowers was 318 cm 2 It was.

[0054] Example 10 Bags containing daisy flowers were prepared in the same manner as in Example 7, except that the weight of the daisy flowers to be placed in the bag was changed to 4,840 g, and then the flower life test for the daisy flowers was carried out in the same manner as in Example 7. The results are shown in Table 3. The inner area of ​​the 25 μm-thick Ocello Fresh (manufactured by Ocello Co., Ltd.) film per 100 g of daisy flowers was 280 cm 2 It was.

[0055] Example 11 Bags containing daisy flowers were prepared in the same manner as in Example 7, except that the weight of daisy flowers to be placed in the bag was changed to 6,350 g, and then a flower-life test for the daisy flowers was carried out in the same manner as in Example 7. The results are shown in Table 3. The internal area of ​​the 25 μm-thick Ocello Fresh (manufactured by Ocello Co., Ltd.) film per 100 g of daisy flowers was 214 cm 2 It was.

[0056] [Table 1]

[0057] [Table 2]

[0058] [Table 3] [Industrial Applicability]

[0059] The package containing water-harvested flowers and the method for maintaining the freshness of water-harvested cut flowers of the present invention involve sealing water-harvested cut flowers in a bag made of a specific plastic film, which prevents the flowers from losing their freshness, prevents discoloration of the package, and prevents water droplets from forming inside the bag during transportation, storage, and display, allowing the flowers inside to look beautiful.Therefore, this method has the potential to create a new market for flowers.

Claims

1. A package containing flowers in which cut flowers are placed in a sealed bag made of plastic film after watering, the film having a thickness of 20 μm to 50 μm and an oxygen permeability of 1,000 cm ３ / m ２ / day・atm~10,000cm ３ / m ２ / day·atm, and the water vapor permeability is 10 g / m ２ ・day~100g / m ２ A package containing flowers, characterized by being within the range of .day.

2. The area of ​​the package containing the flowers is 300 cm per 100 g of the flowers. ２ ~7,000 cm ２ 2. The flower-containing package according to claim 1,

3. A method for preserving the freshness of water-harvested cut flowers in a sealed package containing water-harvested cut flowers, the package being made of a plastic film having a thickness of 20 μm to 50 μm and an oxygen permeability of 1,000 cm ３ / m ２ / day・atm~10,000cm ３ / m ２ / day·atm, and the water vapor permeability is 10 g / m ２ ・day~100g / m ２ ・A method for preserving the freshness of cut flowers after watering, characterized in that the period is within a range of 10 days.

4. The area of ​​the package containing the flowers is 300 cm per 100 g of the flowers. ２ ~7,000 cm ２ 4. The method for preserving the freshness of cut flowers after being hung in water according to claim 3, wherein

5. a step of preparing cut flowers after watering from a blooming plant body, and ３ / m ２ / day・atm~10,000cm ３ / m ２ / day·atm, and the water vapor permeability is 10 g / m ２ ・day~100g / m ２ 5. The method for preserving the freshness of cut flowers after being watered according to claim 3 or 4, further comprising the step of placing the flowers in a bag made of plastic film within a range of 10-15 days to form a package.

6. 6. The method for preserving the freshness of cut flowers after being watered according to claim 3, wherein the cut flowers after being watered include at least one kind of plant flower selected from the group consisting of carnation, rose, chrysanthemum, lisianthus, and leafy plants.

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