JPH0940028A - Food receiving bag and food preserving container with the bag received - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a food receiving bag having high anti-bacterial function and also to provide a food preserving container for reliably preventing anti-bacterial agent from transferring to food. SOLUTION: A food receiving bag 4 comprises at least in part an anti-bacterial resin film 8, wherein the anti-bacterial resin film 8 holds anti-bacterial particles including amorphous calcium phosphate and a clathrate compound with volatile anti-bacterial agent included in cyclodextrin, and an average particle diameter of the anti-bacterial particles is larger than an average thickness of the resin film. A food preserving container seals first food 3 and the food receiving bag 4 including second food 6 different from the first food 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a food storage bag and a food storage container storing the same.

[0002]

2. Description of the Related Art Since fresh foods and processed foods require a lot of time for storage and transportation, it is necessary to prevent the quality (freshness) from deteriorating during that time. . As one of such quality maintaining means, it has been proposed to use an antibacterial agent that suppresses the growth of various bacteria such as mold that adhere to food and propagate. That is, Japanese Utility Model Publication No. 1-164116 discloses a food container in which an antibacterial agent layer made of plastic containing a heat-resistant antibacterial agent is laminated on the inner surface of a container accommodating food.

However, since the antibacterial agent layer is formed by dispersing the antibacterial agent in the binder resin, only the antibacterial agent that appears on the surface portion of the antibacterial agent layer exerts the antibacterial effect, and the antibacterial agent is buried in the resin. Since the existing antibacterial agents do not act effectively, it is necessary to use an excessive amount of antibacterial agents, which causes a problem of cost increase. In addition, Japanese Patent Laid-Open No. 3-
In JP 111984, an isothiocyanate ester having a volatility and a cyclodextrin clathrate compound of a terpene compound are used as an antibacterial agent and are dispersed in a synthetic resin film, or a binder is provided on the surface of the synthetic resin film. An antibacterial food packaging film coated with a resin is disclosed.

When such an antibacterial food packaging film is laminated on the inner surface of a food container by sticking, coating, etc., it exhibits a long-term antibacterial action by volatilization of the antibacterial component from the cyclodextrin inclusion compound. You can However, in instant noodles called so-called cup noodles, since hot water is added to the container (cup) containing the noodles, the cyclodextrin clathrate compound retained on the inner surface of the container is dissolved by the hot water, and the antibacterial component inside melts. When taken out and mixed with food, the flavor of food may change. In particular, isothiocyanic acid ester, which is known as a volatile antibacterial agent, is the main component of the antibacterial action of wasabi, so if it is mixed in food, the food may have a wasabi taste.

Further, the above antibacterial food packaging film is
In a high humidity environment, for example, an environment of 95% humidity, the antibacterial property can be exhibited for a long time, but in an environment of medium humidity, for example, a humidity of about 60%, the antibacterial agent does not easily volatilize. There is also a problem that it does not exhibit sufficient antibacterial properties under normal circumstances. A main object of the present invention is to solve the above technical problems and provide a food storage bag having a high antibacterial action.

Another object of the present invention is to provide a food storage container capable of reliably preventing the transfer of antibacterial agents to food.

[0007]

The food storage bag of the present invention comprises:
At least a part is made of an antibacterial resin film, and the antibacterial resin film holds antibacterial particles containing amorphous calcium phosphate and an inclusion compound in which a volatile antibacterial agent is included in cyclodextrin. The average particle diameter of the antibacterial particles is larger than the average thickness of the resin film.

The food storage container of the present invention is a food storage container in which a first food product and a food storage bag containing a second food product separately from the first food product are enclosed. At least a part of the storage bag is made of an antibacterial resin film, and this antibacterial resin film holds antibacterial particles containing amorphous calcium phosphate and an inclusion compound in which a volatile antibacterial agent is included in cyclodextrin. However, the average particle diameter of the antibacterial particles is larger than the average thickness of the resin film.

The above-mentioned antibacterial particles in the present invention were developed by the present inventors based on the finding that amorphous calcium phosphate can further improve the antibacterial properties of volatile antibacterial agents. By examining the antibacterial properties of the antibacterial agent by blending the above-mentioned amorphous calcium phosphate with the inclusion compound clathrated in cyclodextrin, not only the antibacterial property of the antibacterial agent is improved, but also in a medium humidity environment. The antibacterial agent can be volatilized. Further, the above-mentioned antibacterial particles also have an advantage that they do not transfer an offensive odor (a horseradish odor, a garlic odor, etc.) which tends to occur when an isothiocyanate ester, a terpene compound or the like is used as an antibacterial agent, to food.

Since the antibacterial particles are held on the resin film in a state where the average particle diameter is larger than the average thickness of the resin film, some of the antibacterial particles are surely exposed from the surface of the resin film. In addition, the antibacterial properties of the antibacterial particles can be effectively exhibited, and the use of the antibacterial particles can be minimized with respect to the required antibacterial action.
Further, the antibacterial particles to be used can volatilize the antibacterial agent even in an environment of moderate humidity such as indoors or in a refrigerator because the amorphous calcium phosphate itself has crystal water. .

Therefore, when at least a part of the food storage bag of the present invention is made of an antibacterial resin film, it is possible to prevent mold from propagating in the food stored in the food storage bag, and Freshness) can be maintained for a long period of time. Further, the above-mentioned antibacterial particles have an effect that not only fungi but also pests (tick, dwarf beetle, aphid, etc.) are not attracted.

Here, "at least a part" refers to the case where the entire food storage bag is made of an antibacterial resin film, as well as the storage bag in which two resin films are superposed and the peripheral edges are adhered or fused. When one of the resin films is made of an antibacterial resin film, or a part of the one resin film is an antibacterial resin film.

Further, when the antibacterial particles are exposed from both sides of the antibacterial resin film, the antibacterial effect can be exerted in the food storage container containing the food storage bag. Therefore, it is effective in maintaining the quality of the first and second foods stored in the food storage container and the food storage bag, respectively. Moreover, even when boiling water is poured into the food storage container at the time of use, such as instant noodles, the cyclodextrin contained in the antibacterial particles will be dissolved by removing the food storage bag from the food storage container in advance. There is no risk that the agent will dissolve in hot water and change the taste of food. Incidentally, the antibacterial resin film in the present invention, in addition to the case where the antibacterial particles are exposed from both sides, also includes those in which the antibacterial particles are exposed from only one of the inner surface side and the outer surface side of the storage bag. ing.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION First, the antibacterial particles in the present invention will be described. Amorphous Calcium Phos (Amorphous Calcium Phos), one of the components contained in the antibacterial particles
A phate (hereinafter referred to as ACP) is prepared by granulating a slurry containing ACP. To the above-mentioned slurry, a dispersant which is a water-soluble polymer, such as ammonium triacrylate, is added to a calcium hydroxide suspension under stirring at a rate of 0.1 to 10% by weight, preferably 0.1 to 3% by weight. After that, a mixed solution is obtained, and the mixed solution is obtained by adjusting the pH to 11 to 5 by dropping an aqueous phosphoric acid solution, and contains ACP fine particles having a particle size of about 0.1 μm or less.

The obtained ACP fine particles are calcium phosphate from the diffraction pattern by the powder X-ray diffraction method, and the pattern is broad and different from the diffraction patterns of hydroxyapatite and tricalcium phosphate. ₃ (PO ₄ ) ₂ · nH ₂ O]. In addition, since the ACP fine particles contain water of crystallization, they are considered to be an electrostatically active substance, and it is considered that various ACFs and viruses are easily adsorbed.

Cyclodextrin was added to the above slurry, and 500 to 20000 rp was added using a convection type high speed stirrer.
Stir at m to dissolve and obtain cyclodextrin-added slurry. An antibacterial agent is mixed with the cyclodextrin-added slurry. As the antibacterial agent to be used, allyl isothiocyanate [CH ₂ = CHCH ₂ NCS], which has volatility at room temperature and has bactericidal or bacteriostatic action, hinokitiol, hiba oil, peach oil, penny royal, lemon grass, lemon, spike Lavender, nutmeg, oregano, sage, ginger, savory, thyme, allspice, cedarwood, cinnamon bark, clove buds, cabbage, pine, tea tree, terpenes, etc. are used, and they are used by mixing two or more kinds. May be. In the present invention, it is particularly preferable to use allyl isothiocyanate, which is a horseradish extract component, in order to impart high antibacterial properties.

Examples of the cyclodextrin include α-cyclodextrin, β-cyclodextrin, γ-cyclodextrin and the like, and these may be used as a mixture of two or more kinds. The particle size of the ACP fine particles in the slurry is preferably 0.1 μm or less so that the obtained antibacterial particles have a required specific surface area.

By changing the content of the ACP fine particles in the mixed slurry within the range of 1 to 90% by weight, antibacterial particles having a desired average particle diameter can be obtained.
The antibacterial particles are preferably porous and have a particle size of about 200 to 5 μm, and particularly preferably a specific surface area of 10 m ² / g or more. As a method for producing such particles,
There are a spray drying method, a freeze drying method, and the like, and the spray drying method can be particularly preferably adopted.

The antibacterial particles are prepared by separately producing ACP particles and an inclusion compound in which a volatile antibacterial agent is included in cyclodextrin, and then mixing the particles. Good. The antibacterial particles obtained as described above can be retained on the resin film by the same molding method as in the production of ordinary resin films. As such a molding method, for example, an extrusion method such as blow molding, inflation, or T-die method is preferably used. In the extrusion method, a resin is extruded through a slit having a gap larger than the average particle diameter of the antibacterial particles, and the resin is extruded by a suitable method (for example, biaxially stretched) to obtain the antibacterial properties kneaded in the resin. Most of the particles are held on the resin film while being exposed from the surface of the resin film.

The material of the resin film is not particularly limited, but those which can be kneaded at a relatively low temperature, for example, polyolefin resin (polyethylene resin, polypropylene resin, etc.), styrene resin, EVA (ethylene-
Vinyl acetate copolymer), vinyl chloride resin, polyamide resin (aliphatic polyamide etc.), polyester resin (aliphatic polyester etc.), polyester amide and the like.

The thickness of the resin film may be appropriately determined according to the particle size of the antibacterial particles to be held, but it is preferably about 3 μm or more from the viewpoint of maintaining the shape of the film. The amount of the antimicrobial particles to the resin film, from the top to exhibit antimicrobial stable, 1-60% by weight relative to the resin film, preferably 1 to 30 weight
It should be % .

Next, the food storage bag and the food storage container of the present invention using the antibacterial resin film holding the above antibacterial particles will be described. FIG. 1 is a sectional view showing an example of the food storage container of the present invention. The food storage container 1 shown in FIG. 1 has a food 3 (first food) as a main material inside a container body 2.
And the food storage bag 4 are accommodated therein, and the upper opening is removably closed by the lid 5.

Examples of the food 3 enclosed in the food storage container 1 include instant noodles, dried rice (instant rice) and the like. These foods 3 are usually used after being edible by removing the lid 5 from the container 1 and pouring hot water. that time,
The food storage bag 4 contains supplementary foods 6 (second foods) such as spices (pepper, etc.) for seasoning instant noodles, oysters (eg dried vegetables, dried meat, etc.). It is a thing.

The container body 2 is made of a heat insulating material such as expanded polystyrene, and the lid 5 is made of aluminum foil or the like. As shown in FIG. 2, the food storage bag 4 is formed by stacking two resin films 7 and 8 and sealing the peripheral edge portion 9 by adhesion or fusion. At this time, the resin film 7 is made of a transparent film such as polypropylene, and the surface thereof is printed (not shown) for displaying contents and the like. The other resin film 8 is the above-mentioned antibacterial resin film. This antibacterial resin film 8
Is opaque because it holds antimicrobial particles.

As shown in FIG. 3, the antibacterial resin film 8 has the antibacterial particles 1 partially exposed on both sides.
0 for resin film 11 (linear low-density polyethylene, etc.)
Is held. Therefore, this resin film 8
In the food storage bag 4 obtained by using the above, since the antibacterial component is volatilized inside and outside the storage bag, it is possible to maintain the quality (freshness) of both the internal food 6 and the external food 3. Moreover, the food storage bag 4 is taken out from the container 1 when the food storage container 1 is used, the bag 4 is opened, and the food 6 inside is put into the container 1. Therefore, like the instant noodles, the container 1
Even if pouring hot water into the inside, cyclodextrin is dissolved in the hot water and the antibacterial agent is eluted, so that there is no possibility of deteriorating the taste of foods 3 and 6.

The amount of the antibacterial particles 10 necessary for maintaining the quality of the foods 3 and 6 is usually at least 0.1 mg, preferably 0.05 to 10 mg, per liter of the internal volume of the food storage container 1. Preferably 0.05-1 mg
The antibacterial resin film 8 may be used so that the ratio becomes. On the other hand, FIG. 4 shows an embodiment in which the antibacterial resin film 8 holding the antibacterial particles 10 is laminated on the support 12 to increase the strength of the resin film 8.
As the support 12, a usual resin film that does not allow the volatilized antibacterial component to pass therethrough may be used, and an oxygen-impermeable film may be laminated as a barrier film.
In that case, the quality retention of the food can be further enhanced. Therefore, when one of the inside and the outside of the food storage bag 4 does not require an antibacterial action, such an antibacterial resin film can be used.

Examples of materials for ordinary resin films that can be used as the support 12 include polyolefin resins (polyethylene resins, polypropylene resins, etc.), styrene resins, ethylene-vinyl acetate copolymers, vinyl chloride resins. , Polyamide resin, (aliphatic polyamide, etc.), polyester resin (aliphatic polyester, etc.), polyesteramide and the like. In addition, as the material of the barrier film, for example, polyamide resin,
Examples thereof include polyolefin resins (polyethylene resins, polypropylene resins, etc.), polyester resins (aromatic polyesters, etc.), polyvinylidene chloride and the like.

As the support 12, conversely to the above, a porous film that allows the antibacterial component to pass therethrough may be used to impart a predetermined strength to the antibacterial resin film 8. In addition, the entire antibacterial resin film 8 is covered or laminated with a colored or printed porous film to obtain a food storage bag 4
May have a good appearance. Examples of materials for such porous films include polyolefin resins (polyethylene resins, polypropylene resins, etc.), styrene resins, ethylene-vinyl acetate copolymers, vinyl chloride resins, polyamide resins, (aliphatic polyamides, etc. ),
Examples thereof include polyester resins (aliphatic polyester, etc.), polyester amides, and the like, and paper made of pulp or the like can also be used as the porous film. Furthermore, a non-woven fabric or the like can be used as the porous film.

The thickness of the support 12 varies depending on the purpose of use and the like, but is usually about 3 to 500 μm. Examples of the method for laminating the support 12 and the antibacterial resin film 8 include, for example, the conventionally known inflation method, thermal fusion bonding simultaneous laminating method, coextrusion composite method, laminating method, extrusion-lamination method. Law,
Both the hot melt laminating method and the multi-layer extrusion method can be adopted.

Further, as shown in FIG. 5, antibacterial resin films 8 may be laminated on both surfaces of the support 12 to enhance its antibacterial action. FIG. 6 shows a food storage bag 4 ′ using a resin film 8 in which the support 12 shown in FIG. 4 is laminated on the outside of the storage bag 4. Since a porous foamed resin film having a colored and / or printed surface is used for the support 12, a food storage bag 4'having a good appearance can be obtained without impairing the antibacterial action. .

The food storage bag of the present invention is not only used for instant foods such as instant noodles (cup noodles), but, for example, fresh noodles are packaged in a bag, and a plurality of them are packaged together. In this case, it can also be applied to a storage bag for individual raw noodles. In this case, the antibacterial component may be volatilized only inside the storage bag.

[0032]

According to the food storage bag of the present invention, it is possible to sterilize and sterilize the inside and / or outside of the storage bag with a small amount of antibacterial agent. The quality (freshness) of both the food and / or the food in the food storage bag can be maintained in the storage container.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a food storage container according to the present invention.

FIG. 2 is a cross-sectional view showing an embodiment of a food storage bag stored in the food storage container shown in FIG.

FIG. 3 is a cross-sectional view showing an embodiment of an antibacterial resin film used for a food storage bag.

FIG. 4 is a cross-sectional view showing another embodiment of the antibacterial resin film.

FIG. 5 is a cross-sectional view showing still another embodiment of the antibacterial resin film.

FIG. 6 is a cross-sectional view showing another embodiment of the food storage bag.

[Explanation of symbols]

 1 Food Storage Container 2 Container Body 3 First Food 4 Food Storage Bag 6 Second Food

Claims (2)

[Claims] 1. An antibacterial particle comprising at least a part of an antibacterial resin film, the antibacterial resin film containing amorphous calcium phosphate and an inclusion compound in which a volatile antibacterial agent is included in cyclodextrin. And the average particle diameter of the antibacterial particles is larger than the average thickness of the resin film. 2. A food storage container containing a first food and a food storage bag containing a second food separately from the first food, wherein at least a part of the food storage bag is antibacterial. Made of a volatile resin film, the antibacterial resin film holds antibacterial particles containing an amorphous calcium phosphate and an inclusion compound in which a volatile antibacterial agent is included in cyclodextrin, and the average of the antibacterial particles. A food storage container having a particle size larger than the average thickness of the resin film.