JP2001278354A - Packaging body for maintaining freshness of fruits and vegetables - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging body for maintaining freshness of fruits and vegetables which can realize the tight sealing at a level free from any practical problems without using any facility such as a heat sealer. SOLUTION: This bag-like packaging body for maintaining the freshness of fruits and vegetables formed of a single-layered or multi-layered polymer film having the thickness of <=100 μm comprises a bag-like portion in which the content can be placed from an opening part of the bag-like packaging body and a lid portion which is continuous thereto and covers the opening part of the bag-like portion when it is folded, the adhesive is applied to at least one portion in the vicinity of the lid portion or the opening part. After fruits and vegetables are placed in the bag-like packaging body, and the opening part is folded at the lid portion, and adhered thereto by the adhesive to realize the tight sealing, the concentration of the carbon dioxide gas in the packaging body becomes higher than that in the atmosphere by the breathing of the contents, i.e., the fruits and vegetables, and the oxygen concentration in the packaging body becomes lower than the oxygen concentration in the atmosphere.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an MA (Modified A)
The present invention relates to a package for maintaining the freshness of fruits and vegetables by using a tomosphere, and relates to a package for maintaining freshness of fruits and vegetables which can be sealed without using a heat sealer or the like as in the related art.

[0002]

2. Description of the Related Art In recent years, a freshness maintaining material for fruits and vegetables having an MA (Modified Atomosphere) effect has been developed, and is mainly used for distribution. Fruits and vegetables continue to breathe even after harvesting, and when placed in an environment where the oxygen concentration is lower than the atmosphere (oxygen about 21%, carbon dioxide about 0.04%) and carbon dioxide concentration is high, respiration is suppressed and freshness is maintained. It is known that this is possible. However, if the package is in an environment of excessively low oxygen and high carbon dioxide, the fruits and vegetables will cause respiratory disorders and accelerate deterioration, and conversely, the oxygen concentration is too high or the carbon dioxide concentration is too low And a sufficient freshness retaining effect cannot be obtained. Therefore, it is extremely important to control the inside of the package to an appropriate oxygen concentration and carbon dioxide concentration.
Fruits and vegetables have completely different respiration rates depending on the type, temperature, cutting method, and the like, so it is necessary to adjust the gas permeation amount of the packaging material accordingly.

[0003] Films for maintaining the freshness of fruits and vegetables by MA have been developed by a plurality of manufacturers. These are micropores provided in the film (pore size several hundred μm or less)
They create scratches and scratches and adjust the amount of gas permeation according to their number and size. When packaging fruits and vegetables with these films,
After being processed into a bag, the contents are put into the bag and sealed by heat sealing or the like before use. If the sealed portion is not sufficiently sealed, more oxygen than the set amount of oxygen will enter the package, and the effect of maintaining freshness cannot be expected. However, on the other hand, the necessity of equipment such as a heat sealer for hermetically sealing has prevented the spread of the freshness preserving packaging by MA to small-scale users who have difficulty in introducing the equipment.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a bag-like fruit and vegetable freshness preserving package which can be hermetically sealed at a practically acceptable level without using equipment such as a heat sealer. An object of the present invention is to provide a freshness maintaining package.

[0005]

According to the present invention, in a bag-shaped fresh fruit / vegetable freshness holding package, when sealing with an adhesive, the shape of the bag and the position of application of the adhesive are appropriately adjusted. It is possible to perform a hermetic seal at a level without any problem. As a result, the freshness-preserving packaging of fruits and vegetables by the MA packaging that can be easily used, which has not been available in the past, has been made possible. That is, the present invention relates to a bag-like package made of a single-layer or multilayer polymer film having a thickness of 100 μm or less, wherein the bag-like package has a bag-like portion into which the contents can be put through an opening, and is connected and bent. A cover capable of covering the opening of the bag-like material, an adhesive is applied to at least one portion of the lid or the vicinity of the opening near the opening. After the lid is folded and sealed with the adhesive, the content of the fruits and vegetables themselves is breathed, so that the carbon dioxide concentration in the package is higher than that in the atmosphere, and the oxygen concentration in the package is higher than the atmosphere. This is a fruit freshness preserving package that has a lower concentration than the inside. Further, the present invention provides a bag-like package using a material obtained by laminating a polymer resin having a thickness of 50 μm or less on a porous material as a base material, wherein the bag-like package puts contents through an opening. A bag-shaped part that can be formed, and a lid that can cover the opening of the bag-shaped material by being connected and bent, and an adhesive is applied to at least one portion of the vicinity of the lid or the opening, After putting fruits and vegetables in the bag-shaped package, sealing the lid by bending the lid at the opening and attaching it with the adhesive, the concentration of carbon dioxide in the package is reduced by the breathing of the fruits and vegetables themselves as compared with the atmosphere. This is a package for maintaining freshness of fruits and vegetables, which has a high concentration and an oxygen concentration in the package that is lower than that in the atmosphere. Preferably, the oxygen concentration in the package becomes at least 0.2 to 17% within at least 48 hours after the hermetic sealing, and is made of a material obtained by laminating a porous material and a polymer resin, and a polymer film heat-sealable to the material. Using a bag-shaped package, the polymer resin laminated on the polymer film or porous material is polyethylene, polypropylene, ethylene-vinyl acetate copolymer,
The package for keeping freshness of fruits and vegetables including at least one of nylon, polyvinyl alcohol, a polyvinyl alcohol derivative, polystyrene, and polylactic acid. Preferably, the bag-shaped package has one or more micropores, and the opening area of one opening of the micropores is 0.05 mm ² or less, and a polymer resin laminated on a porous material. The package for keeping freshness of fruits and vegetables, wherein the layer has one or more micropores, and an opening area of one opening of the micropores is 0.05 mm ² or less. Preferably, the fruit and vegetable freshness preserving package, wherein the porous material is paper, expanded polystyrene, expanded polypropylene, expanded polyethylene, or nonwoven fabric.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The material of the polymer film of the package of the present invention is not particularly limited. Specifically, polyolefin resins such as polyethylene and polypropylene, polystyrene, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, polyvinyl acetate, polyester, various nylon resins and the like can be used, and these are homopolymers or two or more types. They may be used as copolymers and blends containing them. These may be used as a single layer or as a multilayer film of two or more layers. Further, for example, it may be used after performing processing such as stretching. Further, fillers and additives may be added as necessary.

[0007] The porous material used in the present invention includes:
Examples include paper, synthetic paper, nonwoven fabric, and foamed plastics such as expanded polystyrene and expanded polypropylene. The paper in this case includes processed paperboard, laminated balls, polyethylene, polypropylene processed balls, and resin processed balls which are the materials of the paper container. The porous material may be used alone,
A plastic layer may be provided for the purpose of imparting sealing properties, controlling the amount of gas permeation, and improving water resistance. Further, the plastic layer to be laminated on the porous material may be provided by means such as coating and laminating. The material of the plastic layer may be any material, and examples thereof include polyolefins such as polyethylene and polypropylene, copolymers such as polyolefin and vinyl acetate and saponified products thereof, polystyrene and copolymers thereof, and polyester. These may be used alone or as a blend of two or more. Fillers and additives may be added as necessary. This film may be used in the form of a multilayer film in combination with another polyolefin film, polyester film, polyamide film or the like. That is, the material used in the present invention is not particularly limited as long as it can be used for packaging of fruits and vegetables. Further, antifogging property may be provided.

What is important in the present invention is that when these films are processed into bags and sealed by the method described below, they have an appropriate gas permeation amount according to the contents. For that purpose, in order to adjust the gas permeation amount, a conventional process such as forming a fine hole (a hole diameter of several hundred μm or less) or a scratch may be performed. In order to appropriately control the oxygen concentration in the package, it is preferable that at least one opening has an opening area of 0.05 mm ² or less.

The material of the pressure-sensitive adhesive used in the present invention is not particularly limited. For example, for natural products, starch paste, dextrin, glue, gum arabic, for synthetic products, polyvinyl alcohol, vinyl acetate resin, acrylic resin, polyurethane resin, ethylene-vinyl acetate copolymer resin, synthetic rubber, etc. However, the present invention is not limited to these. Adhesive strength, cost, food hygiene,
An appropriate pressure-sensitive adhesive can be properly used depending on a combination with a packaging material to be used.

FIG. 1 shows an embodiment of the present invention. a is the state before the hermetic seal. The bag-shaped part (1) is sealed on three sides other than the opening (3) so that the contents can be put in. The lid (2) is integral with the bag-shaped part, and the adhesive application part (4) is at the top. After putting the contents in the bag,
The lid is bent forward at the bent portion (5) and sealed as shown in b. By designing the pressure-sensitive adhesive to be larger than the widths at the upper and lower portions of the opening in the state of b, an excellent sealing property of the opening can be obtained. FIG. 2 shows another embodiment of the present invention.
Shown in a is the state before the hermetic seal. The bag-shaped part (1) is sealed on three sides other than the opening (3) so that the contents can be put in. The lid (2) is integral with the bag. Adhesive application part (4) on top of top part of bag-shaped part
There is. After the contents are put in the bag-shaped part, the lid part is bent forward by the bent part (5) and sealed as shown in b. By designing the pressure-sensitive adhesive to be larger than the widths at the upper and lower portions of the opening in the state of b, a material having excellent sealing performance of the opening can be obtained. FIG. 3 shows a conventional example. a is the state before the hermetic seal. Bag-shaped part (1) so that contents can be put in
Is sealed on three sides other than the opening (3). The lid part (2) is integral with the bag-shaped part, and the pressure-sensitive adhesive applied part (4) is present on almost the entire surface. After putting the contents in the bag,
The lid is bent forward at the bent portion (5), and is sealed as shown in b. In the state of b, since the opening and the bent portion are located at the same position, there is a problem that the sealing of the same portion is incomplete, and there is a problem that the amount of gas entering the package from there is greatly different depending on how to stick, and is stable. Preservability cannot be obtained.

Further, in the form shown in FIG. 3, there is a danger that the contents will directly touch the adhesive after sealing, whereas
In the configuration shown in FIG. 2, the risk is greatly reduced. In the present invention, it is a major premise to use a material that does not have a problem in food hygiene for the packaging material because it is a food packaging material. However, the adhesion of the adhesive to the contents is still avoided as much as possible from the appearance problem. 2 is superior in this respect. If necessary, so-called release paper may be used for the part that has been subjected to the pressure-sensitive adhesive processing.

In order to obtain a freshness maintaining effect, the oxygen concentration in the package is set within a range of 0.2 to 17% according to the contents within 48 hours after the packaging, and the state is stably maintained. Is preferred. For example, broccoli is 5
15%, 8-17% for carrots, 1 for soybean sprouts
10% is preferred. Means such as gas replacement may be used to quickly bring the gas concentration in the package to a predetermined range.
What is important is to control the oxygen permeation rate of the whole package according to the respiration rate of the fruits and vegetables in the contents.

[0013]

The present invention will be described below with reference to examples. Note that the present invention is not limited to this embodiment. Example 1 A 25-μm-thick biaxially stretched nylon film (trade name: emblem) manufactured by Unitika Ltd. is provided on the sealing surface side with an anti-fog agent sorbitan monolaurate (trade name: Leodor Super SP-L10, manufactured by Kao Corporation) (F)) is 0.1
Coated to a thickness of μm. Fine holes having an opening area of 0.02 mm ² were formed in the film at a rate of 0.04 / cm ² . This film was processed into a bag shape as shown in FIG. 4a, and ten okras (about 100 g) were put into this bag.
Ten packs were prepared as sealed in b and stored at 12 ° C. The oxygen concentration after 48 hours has passed is 9.8-12%
Although stored until the 6th day, the appearance and odor hardly changed and the fresh state was maintained.

Example 2 A thickness of 25 manufactured by Toyobo Co., Ltd.
Micropores having an opening area of 0.02 mm ² were formed at a rate of 0.05 / cm ^{2 in} a biaxially stretched antifogging polypropylene nylon film of μm. This film was processed into a bag shape as shown in FIG. 5a, and ten okras (about 100 g) were put into the bag and sealed as shown in FIG.
Stored at 2 ° C. The oxygen concentration after lapse of 48 hours is 9.5 to
It was 11.8%, and was stored until the 6th day. However, the appearance and odor were almost unchanged, and the fresh state was maintained.

Comparative Example 1 The same film as in Example 1 was processed as shown in FIG. 6A, and 10 okra (about 10
0g) and sealed as shown in FIG. 6B to produce 10 packs, which were stored at 12 ° C. After 48 hours, the oxygen concentration was 12.0 to 20.9%. After storage until the sixth day, 5 out of 10 packs had almost no change in appearance and odor, but the remaining 5 packs of okra had There was no commercial value due to wilting.

[0016]

According to the present invention, an excellent fruit and vegetable freshness preserving package which can be easily sealed without using any machine or equipment, and has good shelf life of the fruit and vegetable can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic front view of a package according to an embodiment of the present invention. A: Before sealing and b: After sealing.

FIG. 2 is a schematic front view of a package according to another embodiment of the present invention. A: Before sealing and b: After sealing.

FIG. 3 is a schematic front view of a package according to a conventional example, a: before sealing, b: after sealing.

FIG. 4 is a schematic front view of the package of Example 1 (the form is the same as in FIG. 1 and the numbers are dimensions: mm) a: before sealing and b: after sealing.

FIG. 5 is a schematic front view of the package of Example 2 (the form is the same as in FIG. 2; the numbers are dimensions: mm) a: before sealing and b: after sealing.

FIG. 6 is a schematic front view of the package of Comparative Example 1 (the form is the same as in FIG. 3; the numbers are dimensions: mm) a: before sealing and b: after sealing.

[Explanation of symbols]

 1: bag-like part 2: lid part 3: opening part 4: adhesive application part 5: bending part

Claims (10)

[Claims] 1. A bag-like package made of a single-layer or multi-layer polymer film having a thickness of 100 μm or less, wherein the bag-like package can be filled with contents through an opening, and the bag-like package is folded. By a lid that can cover the opening of the bag-like material, an adhesive is applied to at least one portion of the lid or the vicinity of the opening,
After putting fruits and vegetables in the bag-shaped package, sealing the lid by bending the lid at the opening and attaching it with the adhesive, the concentration of carbon dioxide in the package is reduced by the breathing of the fruits and vegetables themselves as compared with the atmosphere. A freshness-retaining package for fruits and vegetables, wherein the package has a high concentration and the oxygen concentration in the package is lower than that in the atmosphere. 2. A bag-like package, in which a porous material is used as a base material and a material in which a polymer resin having a thickness of 50 μm or less is laminated is used at least in part, and the bag-like package puts contents through an opening. A bag-shaped part that can be formed, and a lid that can cover the opening of the bag-shaped material by being connected and bent, and an adhesive is applied to at least one portion of the vicinity of the lid or the opening, After putting fruits and vegetables in the bag-shaped package, sealing the lid by bending the lid at the opening and attaching it with the adhesive, the concentration of carbon dioxide in the package is reduced by the breathing of the fruits and vegetables themselves as compared with the atmosphere. A freshness-retaining package for fruits and vegetables, wherein the package has a high concentration and the oxygen concentration in the package is lower than that in the atmosphere. 3. The package for preserving freshness of fruits and vegetables according to claim 1, wherein the oxygen concentration in the package becomes 0.2 to 17% within at least 48 hours after the hermetically sealing. 4. The package for maintaining freshness of fruits and vegetables according to claim 2, wherein a bag-like package made of a material obtained by laminating a porous material and a polymer resin and a heat-sealable polymer film is used for the material. 5. The polymer resin laminated on the polymer film or the porous material is polyethylene, polypropylene, ethylene-vinyl acetate copolymer, nylon, polyvinyl alcohol, polyvinyl alcohol derivative, polystyrene,
The package for keeping freshness of fruits and vegetables according to claim 1, comprising at least one of polylactic acid. 6. The bag-shaped package has one or more micropores, and an opening area of one opening of the micropores is 0.05 m.
The freshness-preserving package for fruits and vegetables according to claim 1, which has a m ² or less. 7. The polymer resin layer laminated on the porous material has one
7. The freshness preserving package for fruits and vegetables according to claim ² , which has at least one fine hole, and the opening area of one opening of the fine hole is 0.05 mm2 or less. 8. The package according to claim 2, wherein the porous material is paper. 9. The package for keeping freshness of fruits and vegetables according to claim 2, wherein the porous material is expanded polystyrene, expanded polypropylene or expanded polyethylene. 10. The porous material is a non-woven fabric.
7. The package for keeping freshness of fruits and vegetables according to 7.