JPH10114372A - Package having gas absorbent sealed therein - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an absorbent from being brought into contact with contents in a package, by setting the absorbent at an intermediate portion between an inner film through which an activated gas is easy to permeate and a barrier film. SOLUTION: A multilayer film 1 for sealing an opening of a molded container 4 by heat sealing is composed of an inner film 3 through which gas of at least promoting the change of properties of contents 5 is easy to permeate, and an outer film 2 for cutting off such gas. A multiple gas absorbent 6 is sealed in this multilayer film 1. The outer film 2 has at least a single layer of a barrier film for an activated gas and is further formed by laminating a heat-sealing film which can adhere to the inner film 3 by means of heat-sealing, etc. As a base film for the outer film 2, it is preferable to use a biaxially oriented film made of polyester, etc., which is excellent in printability and post- processability, and whose thickness is about 6 to 50μm. It is also preferable that the inner film 3 is a thermoplastic film whose tensile yield point elongation is about 200 to 800%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lid material for sealing a molded container after filling the contents thereof, wherein the lid material of the package is a gas or a vapor which changes the contents (hereinafter referred to as an active gas). The present invention belongs to a package that stores an absorbent having the absorbent property of (1) and maintains the effect of preventing deterioration of the contents.

[0002]

Conventionally, a special gas or vapor (a gas in this specification refers to a substance which is in a vaporized state at room temperature, such as oxygen gas or carbon dioxide gas,
The vapor is a liquid or solid substance at normal temperature, and means a liquid or solid such as water or dichlorobenzene which has a slight vapor pressure at normal temperature. Both are simply referred to as “gas”. In a package that extremely dislikes (1), the gas absorbent and the contents are packaged in the same package. However, the gas absorbent comes into contact with the contents, or an anaerobic bacterium corresponding to the gas, such as Botreenus, which is an anaerobic bacterium that grows under low oxygen concentration, adheres to the bag of the oxygen absorbent, for example. In this case, when the bag of the oxygen absorbent comes into contact with the contents of the package using the oxygen absorbent, there is a danger that Botrynus bacteria will proliferate therein.

[0003] The present invention relates to a package containing a gas absorbent, wherein the contents and the gas absorbent or the package containing the gas absorbent do not come into direct contact with the contents, especially the lid of a molded container. Providing is an issue.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a package for packaging a gas-absorbing agent for promoting the deterioration of the content and the content in the same package. A gas absorbent is sealed in the middle of a multilayer structure in which a part of the wrapping material that facilitates the deterioration of the contents is easily permeated by a gas that facilitates the permeation of the gas and an outer film that blocks the gas and that can be heat-sealed with the inner film. It is a package. And, in the inner film,
It is a package in which a gas absorbent provided with fine holes for ventilation is enclosed. Further, in the package, the inner film and the outer film can be firmly adhered by heat sealing, and the heat-sealed surface of the inner film other than the outer film is a gas absorbent having an easily peelable heat sealing strength. It is a sealed package.

[0005] When the opening of the molded container is sealed by heat sealing with a lid material, the lid material includes at least an inner film through which the active gas easily permeates, and an outer film (barrier film) having a gas-blocking property. , Wherein a gas absorbent containing a gas absorbent is enclosed between the inner film and the outer lid.

[0006]

2. Description of the Related Art The material of a molded container for wrapping contents that are liable to deteriorate is a single layer made of a material that prevents permeation and diffusion of a chemical substance from the outside, which causes a change in the quality of the stored contents. Alternatively, a package or a molded container of a multilayer barrier sheet is sealed with a cover material of the barrier sheet.

The alteration of the contents is, for example, moisture absorption / deliquescence of the dried material due to the permeation of water vapor, and conversely, drying of the hydrated content. Oxidation of drying oils and metals by oxygen gas and promotion of mold generation. Moisture absorption and oxidation associated with bag breakage due to increased pressure inside the package due to carbon dioxide gas generated from the contents. Damage or damage due to physical factors such as external organisms and transportation
Deterioration due to oxygen and moisture that penetrate through the extremely small holes generated. As can be seen from the above, many of them are primarily caused by oxygen gas and water vapor (moisture), and the alteration is caused by damage to the package due to external causes.

[0008] For those who dislike oxygen gas, vacuum filling is used to pack the gas in a degassed state, or gas-filled packaging is performed while purging the active gas with an inert gas. I was However, vacuum packaging has a difficulty in maintaining the shape of the contents because the packaging container is in close contact with the contents, and gas-filled packaging cannot be completely replaced with an inert gas, so trace components are not possible. However, there was a drawback that the oxidation reaction of the compound could not be prevented.

[0009] It is extremely difficult to remove oxygen and moisture adsorbed on the contents at the time of filling and packaging, and extremely small holes and seal leakage due to damage due to living organisms and physical causes are prevented. It is extremely difficult to completely remove it. In such a case, a deoxidizer that absorbs or is physically absorbed by a substance that chemically reacts with a trace amount of oxygen or moisture remaining in the package, a carbon dioxide absorbent generated inside the package, , A desiccant and the like have been packaged simultaneously in a package.

A package contains a deoxidizer, a carbon dioxide absorbent, a desiccant, a dehumidifier (hereinafter, various gas absorbents are simply referred to as an absorbent in the present specification). For this reason, conventionally, the contents have been placed on or below the contents and packaged at the same time, or pasted on the back side of the lid material. In such a case, there has been a problem that, for example, anaerobic bacteria or heat-resistant yeast attached to the container of the oxygen scavenger propagate using the contents as a nutrient source. In addition, since the absorbent comes into contact with the contents, for example, there is a restriction that it cannot be used when there is a possibility that calcium hydroxide or calcium oxide absorbing carbon dioxide or water vapor may come into contact with food. In addition, vanadium pentoxide and silica gel, which are dehumidifiers for computer hard disks, are not only contaminated when their powder adheres to the hard disk,
There is a restriction that the part cannot be used because the part is over-humidified and the hard disk cannot be started.

The present invention has been made in view of the above-described problems and restrictions, and has as its object to be able to exhibit the effects of the contents by enclosing them in a package in a state where the contents do not come into direct contact with the absorbent. is there.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION In order to achieve the above object, the present invention relates to a multilayer film (lid material 1) for sealing an opening of a molding container 4 by heat sealing as shown in FIG. Is a multi-layer film 1 capable of enclosing a multiple gas absorbent 6 composed of an inner film 3 that facilitates gas permeation that promotes at least alteration of the contents 5 and an outer film 2 (outer lid 2) that blocks the gas. It is.

The outer film 1 can be formed by forming at least a single layer of an active gas barrier film, and further laminating an inner film and a heat seal film that can be bonded by heat sealing or the like.

The material constituting the outer film is mainly composed of polyolefin resins such as polyethylene and polypropylene, polystyrene, polyvinyl chloride, polyvinyl alcohol, saponified ethylene-vinyl acetate copolymer, polyamide, acrylate or methacrylate. Acrylic resin, polyethylene terephthalate, polybutylene terephthalate, polyester such as polyethylene naphthalate, polyacetal, cellulose derivative of acetyl di or tri cellulose, or stretched or unstretched film made of polycarbonate,
Alternatively, these stretched films are obtained by depositing aluminum or silicon oxide or coating a barrier material such as polyvinylidene chloride or polyvinyl alcohol. Also,
A laminate of paper, aluminum foil, and the above-mentioned thermoplastic resin film can also be used. Then, these films are used as a base film, and a heat-sealing layer is provided so that the inner film can be heat-sealed.

Among the above resins, a biaxially stretched film of polyester, polypropylene or nylon 6 having a thickness of 6 to 50 μm, which is particularly excellent in printability and post-processing suitability, is preferred as the base film of the outer film. is there. As a matter of course, the outer film and the inner film must be able to be bonded by heat sealing or the like at the contact surface, but the bonding portion may be a peripheral portion of only the sealing portion 40 of the package. An unstretched film or a polyolefin resin layer formed by melt extrusion coating is effective as a heat seal layer.

The inner film 3 is a film of a thermoplastic resin, and is made of a material through which the active gas of the contents easily permeates. And, the tensile yield point elongation of the film is 200 to 8
A 00% thermoplastic resin film is preferred. When the elongation is 200% or less, the absorbent cannot be sealed in the middle between the outer film 2 and the inner film 3, and in some cases, the sealed portion can be formed and provided. Also, when the elongation exceeds 800%, there is no particular problem. However, when the package is opened, the inner film may be stretched, the cut may be poor, and it may be difficult to open the package.

If the inner film 3 cannot transmit the active gas within a desired time, as shown in FIG. 2, a ventilation hole 33 is provided in a part of the film to promote the transmission of the active gas. can do. The micro holes 33 are
If it is large, the contents will come into contact with the absorbent,
It is preferable to provide a fine hole for ventilation that is not penetrated completely and is about the same as a scratch in an unpenetrated state, or provided in a portion that does not come into contact with the contents.

When the package of the present invention is used to form a lid for a molded container, it is preferable that the inner film can be firmly bonded to the outer film by heat sealing, while the inner film has easy peelability. It preferably has a weak heat seal strength. For this purpose, it can be formed as a multilayer film. A layer that promotes adhesion of a heat-sensitive adhesive such as a vinyl chloride-vinyl acetate copolymer or a polyol / isocyanate to any one of the films in contact with each other so that the inner film and the outer film can be strongly heat-sealed. It can also be coated and configured as Conversely, a heat-sensitive adhesive that can be adjusted to a desired adhesive strength can be applied to the inner film on the side to be heat-sealed by contacting the container, and the adhesive strength can be adjusted to a weak adhesive strength.

The thermoplastic resin constituting the inner film includes polyethylene, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-acrylic ester copolymer, ionomer, polyolefin resin such as polypropylene, polybutene resin. 1, polystyrene,
Polyvinyl chloride, or nylon 6, nylon 10,
Polyamides such as nylon 11 and nylon 12, acrylic resins containing acrylate or methacrylate as main components, polyesters such as polyethylene terephthalate, polybutylene terephthalate and polyethylene naphthalate, polyacetals, acetyl di- or tri-
It is a stretched or unstretched film made of cellulose derivative of cellulose or polycarbonate.

The inner film can be perforated with a needle, a hot needle, a laser beam or the like to increase the gas permeability.

When the inner film and the outer film are opposed to each other, the gas absorbent is attached or placed on one of the films, preferably a rigid outer film, and the other film is heat-sealed to the container. It can be inserted by temporarily bonding a part or a part corresponding to the periphery of the container.

Hereinafter, the present invention will be described in more detail with reference to Examples.

【Example】

(Example 1) As shown in FIG. 1 and FIG.
The base film 21 was formed by dry laminating the m-biaxially stretched polyester film and the vinylidene chloride-coated biaxially stretched nylon film having a thickness of 15 μm via a usual polyester-isocyanate-based curable adhesive layer. Further, an outer film 2 was formed by dry laminating a biaxially stretched nylon film surface and a linear polyethylene film having a thickness of 30 μm as the heat seal layer 22 with the curable adhesive layer 25 provided thereon. On the other hand, a co-extruded laminated film of a low-density polyethylene (adhesive layer 31) and an ethylene / vinyl acetate copolymer (easy peeling layer 32 with a molding container) was formed as inner film 3. Injection molding of polypropylene is performed and the content 5 shown in FIG.
A container 4 of 00 cc is prepared, and the contents 5 are stored in the container.
Approximately 400 g of loosened white rice immediately after cooking was filled. Then, “Ageless 100 (a deoxidizer, trade name, manufactured by Mitsubishi Chemical Corporation)” is adhered to the heat seal layer 22 of the outer film 2 as a gas absorbent 6, and the low-density polyethylene 31 of the inner film 3 is adhered. The surfaces of the ethylene / vinyl acetate copolymer 32 and the flange (sealing part 40) of the molding container 4 are heat-sealed and sealed, and
A sample of Example 1 was prepared.

(Embodiment 2) As shown in FIG.
Using a multi-layer film composed of an outer film 2 and an inner film 3 with a gas permeability increased by providing a fine hole 33 by “perforating one place” with a needle having a diameter of 0.5 mm, Example 2 was carried out in the same manner as in Example 1 except that "white rice inoculated with mold spores" was used as the content 5.
Was prepared.

Comparative Example 1 A sample of Comparative Example 1 was prepared by filling and sealing white rice in the same manner as in Example 1 except that “Ageless 100” was not used.

Comparative Example 2 White rice was inoculated with mold spores of the Penicillium species, and was filled and sealed using an ageless method as in Example 1 except that "the inner film was not perforated". In the same manner as in Example 1, white rice was filled to prepare a sample of Comparative Example 2.

The inner film and the outer film of the examples were firmly heat-sealed, while the inner film and the molded container were weakly adhered and easily peelable.
Then, when the outer film was peeled from the container, the inner film could be opened from the molded container without peeling or tearing between the inner film and the outer film.

Table 1 shows the results obtained by storing the samples of Examples 1 and 2 and Comparative Examples 1 and 2 at 25 ° C. and confirming the occurrence of mold. (Below)

[0028]

[Table 1]

(Example 3) The inner film 3 (carbon dioxide permeability: 50,000 cc / m ² · day, 1 atm) prepared in Example 1 was subjected to a non-penetrating perforation process to make a scratch on the film, and the carbon dioxide gas was permeated. Degree 15000cc / m ²・
(1 atm / day) of the inner film of Example 3. 1 g of water and 5 g of calcium hydroxide were wrapped in glassine paper to prepare a carbon dioxide absorbent 6. Then, 300 g of the coffee beans immediately after roasting were filled as contents 5 into the polypropylene container 4 prepared in Example 1, and the easily peelable layer 32 of the inner film 3 of Example 3 and the molded container were heat-sealed, The above carbon dioxide absorbent 6 was placed thereon. Next, the outer film 2 prepared in Example 1
Was heat-sealed with a flange (sealing portion 40) of the container, and a heat-sealing portion 41 was provided and hermetically sealed to prepare a coffee bean package of Example 3.

(Comparative Example 3) A sample of Comparative Example 3 was prepared by filling a polypropylene container with coffee beans immediately after roasting in the same manner as in Example 3 except that the carbon dioxide absorbent 6 was not used.

The samples of Example 3 and Comparative Example 3 were treated at 37 ° C. for 1 hour.
Saved for a week. As a result, in the case of Example 3, the swelling during roasting could be maintained to the extent that the multilayer film 1 was slightly swollen. On the other hand, in Comparative Example 3,
Due to the increase of the internal pressure due to the carbon dioxide gas generated from the roasted coffee beans, the sealing portion 40 of the container and the inner film 3
At the heat seal portion 41, and emission of aroma was observed.

[0032]

According to the lid material of the molded container, the absorbent material which is placed between the inner film and the barrier film, which easily allows the active gas to permeate, has the remaining activity without the absorbent contacting the contents. Since the gas and the generated gas are absorbed, the function and effect of the absorbent can be maintained.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a package in which a gas absorbent is sealed.

FIG. 2 is a schematic enlarged cross-sectional view of a heat seal portion and a multilayer film of a package.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Multilayer film (lid material) 2 Outer film 21 Base film 22 Heat seal layer 25 Adhesive layer 3 Inner film 31 Adhesive layer 32 Easy peeling layer 33 Micropore 4 Container 40 Seal part 41 Heat seal part 5 Contents 6 Absorbent

Claims (3)

[Claims] Claims: 1. In a package for packaging a content and a drug that absorbs a gas that promotes alteration of the content, the gas that promotes alteration of the content is partially contained in the packaging material that forms the package. A package characterized in that a gas absorbent is sealed in the middle of a multilayer structure of an inner film that is easily permeable and an outer film that can block the gas and heat seal with the inner film. 2. The package according to claim 1, wherein the inner film is provided with fine holes for ventilation. 3. The package, wherein the inner film and the outer film can be firmly adhered by heat sealing, and the inner film has a heat-peeling strength that is easily peelable from a surface of the inner film other than the outer film to be heat-sealed. A package in which the gas absorbent according to claim 1 is enclosed.