JP3305000B2 - Liquid resistant quality preservative package - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a package for retaining a liquid-resistant quality such as a deoxidizer, a carbon dioxide absorbent, an ethylene absorbent, a rust preventive or a desiccant. In particular, the quality preservative package of the present invention has excellent liquid resistance, and is suitably used for maintaining the quality of multi-moisture articles in which liquid resistance and leakage of contents are problematic, such as foods, beverages, fruits and vegetables, and the like. It can be widely used to maintain quality not only in the food field, but also in a wide range of fields such as metal parts and pharmaceuticals.

[0002]

2. Description of the Related Art Examples of a package for a quality preservative include packages of a deoxidizer, a carbon dioxide gas absorbent, an ethylene absorbent, a desiccant, a rust preventive, and the like. Above all, oxygen scavenger packages have recently been widely used mainly for food products. However, there is a wide variety of foods subject to quality preservation, and conventional oxygen-absorbing packaging using a breathable packaging material causes stains and
There were many foods and beverages that were difficult to apply due to the occurrence of rust and the like.

[0003] As a conventional air-permeable packaging material for an oxygen scavenger package, for example, a laminated material of paper and a perforated polyethylene film is used, and in this case, the air permeability is controlled by the opening ratio of the polyethylene film. It had been. But,
When this oxygen absorber is applied to humid foods and beverages, the packaging material is inferior in water resistance, so that the packaging bag of the oxygen absorber is damaged due to moisture, or the contents permeate through the holes of the perforated polyethylene film. This is not preferable in terms of food safety and hygiene, and furthermore, the rate of oxygen absorption is reduced due to water wetting, and the quality retention ability may not be sufficiently exhibited.

As a packaging material for improving the above-mentioned drawbacks, Japanese Patent Application Laid-Open No. 53-51096 discloses a method in which two plastic films having different melting points are perforated, and these are laminated as they are or laminated with paper. Packaging materials are disclosed. Also, JP-A-56-124440 or JP-A-5-124440
Japanese Patent Application Laid-Open No. 6-124441 discloses a packaging material using a plastic film also having a hole in the surface. However, since the surface of the packaging material is a plastic film, the surface of the packaging material is higher in water resistance than paper, but is provided with a large number of through holes for providing air permeability, so that a humid food, that is, a food having a high moisture content. When it comes in contact with, the packaging material becomes wet and the contents seep out, causing a problem of safety and hygiene, and has a low strength. In addition, there are drawbacks such as deformation of the holes and change in air permeability due to the effect of the adhesive due to thermal bonding or use of an adhesive during the production of the packaging material. In addition, when applied to humid foods, the plastic film and paper on the surface may peel off, making it impossible to use them as packaging materials such as oxygen absorbers. In any case, it is a common practice to ensure oxygen permeability by piercing pores in a plastic film with a needle or the like. And the quality preserving agent such as the oxygen scavenger gets wet to stop the oxygen absorption or leak the contents.

Further, plastic films having high oxygen permeability (eg, polyethylene, polymethylpentene,
When a film such as polybutadiene) is used as a packaging material for a quality preservative such as an oxygen scavenger package, the oxygen permeability required for obtaining a practically sufficient oxygen absorption rate, although having excellent liquid resistance, It was impossible to secure. Furthermore, as an example of a cap-type oxygen absorber for liquids,
-080260 describes that a water-resistant microporous membrane or the like is used as an isolating material, but it is difficult to apply to permeable liquids such as alcohol-containing beverages and the liquid resistance is insufficient. Occurred. Also,
When producing a breathable packaging material, it has been through complicated and inferior productivity steps such as perforating a film with a hot needle or the like, heat lamination, and the like.

As described above, the conventional air-permeable packaging material requires a complicated process such as perforating a film with a hot needle or the like at the time of production, heat lamination, and the like, and has low productivity. As a problem of quality preservative package such as oxygen scavenger by material, there is a problem of liquid resistance in terms of liquid permeation resistance and liquid resistance, and there is also a problem of stain and rust transfer of contents, and humid foods ,
It has been pointed out that when applied to beverages, liquid pharmaceuticals and the like, problems occur in safety and health and it is difficult to secure a practically sufficient oxygen permeability.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the conventional package for preserving a quality, and to improve safety and hygiene even when applied to humid foods, beverages, liquid pharmaceuticals and the like. It is an object of the present invention to provide a liquid-resistant quality-retaining agent package that has no problem, has sufficient practical air permeability, and can sufficiently exhibit a quality-retaining function.

[0008]

Means for Solving the Problems The present inventors have conducted intensive studies in view of the problems of the prior art, and as a result, completed the present invention. That is, the quality preservative package according to the present invention is a film or sheet in which non-penetrated microporous holes are perforated to leave a non-penetrated membrane part, and has an oxygen permeability of 10,000 cc /
and configuration requirements that formed by Le - a m ² · 24Hr · atm or more liquid-permeable packaging material, the packaging and the quality maintenance agent is used as all or part of the wrapper.

Hereinafter, the present invention will be described in detail. As a liquid-permeable gas-permeable packaging material of the liquid-resistant quality preservative package of the present invention,
For example, the following configuration is provided. (1) Polyethylene terephthalate, polyamide, polypropylene, polycarbonate, cellophane, polymethylpentene, polyvinyl alcohol, etc., heat-resistant films such as polyvinylidene chloride coated films, aluminum foil laminated films, aluminum-deposited films, etc. , Polypropylene, ethylene acrylic acid copolymer resin, ethylene ethyl acrylate copolymer resin, ionomer, polybutadiene,
A screen made of an ethylene-vinyl acetate copolymer resin film, etc.
A non-penetrated microporous body is formed by penetrating the heat-resistant film side and leaving at least a non-penetrated remaining film part on the sealable film side in a laminated film obtained by laminating and adhering the heat-resistant film. Packaging material.

(2) The above-mentioned heat-resistant film alone or the laminated film of (1) and a heat-sealing nonwoven fabric (for example, polypropylene such as "Elves" made by Unitika, "Unicell" made by Teijin, etc.) Various microporous membranes made of synthetic fibers, composite fibers, wet or dry nonwoven fabrics made from synthetic pulp, etc., polyethylene, polypropylene, etc. (for example, "Selpore" manufactured by Sekisui Chemical, "Polam" manufactured by Tokuyama Soda, " Various types of microporous membranes that are impermeable to water at normal pressure, such as "NF sheet", are used), or synthetic resins,
Water- resistant nonwoven fabric made of synthetic pulp (for example, various nonwoven fabrics that are impermeable to water at normal pressure, such as "Tyvek" manufactured by DuPont, "Luxer" manufactured by Asahi Kasei, "Alto" manufactured by Awa Paper) are used.
And a laminated sheet obtained by laminating and adhering a laminated porous sheet from the heat-resistant film side, and at least a non-penetrated microporous material having a non-penetrated remaining film portion left in the laminated sheet.

(3) Heat-sealable polyethylene terephthalate, polypropylene or other such heat-sealing single film perforated from the opposite side of the heat-sealing surface, leaving at least the remaining film portion of the unpenetrated fine film. Packaging material with perforations.

(4) Perforating the heat resistant film alone or the laminated film (1) obtained by applying a hot melt as a seal layer to the laminated film (1) from the heat resistant film side. A packaging material in which an unpenetrated microporous material having a penetrating residual film portion is perforated.

(5) Non-penetrating microporous material having at least a residual film portion left on polyethylene, polypropylene, ethylene acrylic acid copolymer resin, ethylene ethyl acrylate copolymer resin, ionomer, polybutadiene, ethylene vinyl acetate copolymer resin film, etc. Perforated packaging material.

Although the above-described configuration is exemplified, the packaging material used in the present invention is not limited to the above-described example, and other combinations may be used as long as the object of the present invention is achieved. Can be used. In addition, various reinforcing materials are combined for reinforcement as appropriate. It is also possible to perform perforation from both sides of the packaging material, and it is necessary to penetrate a film layer with poor gas permeability, but even with a film with low gas permeability, the non-penetrating remaining film portion has sufficient gas permeability. If a desired oxygen permeability can be obtained by the property, it is not always necessary to penetrate.

As the heat-resistant film in the constitution of the packaging material, a film of polyethylene terephthalate, polyamide, polymethylpentene, polypropylene or the like is preferably used in consideration of packaging suitability, ease of perforation, oxygen permeability and the like.

Next, an ethylene acrylic acid copolymer resin, an ethylene ethyl acrylate copolymer resin, an ionomer, and an ethylene vinyl acetate copolymer resin film are preferably used as the seal layer. When further heat resistance is required when applied to retort foods and the like, it is preferable to use a film of polypropylene, high-density polyethylene, medium-density polyethylene or the like as the seal layer. It is also preferable to use a heat-sealing single film as a packaging material for a quality preservative. Also,
When printing is performed on the breathable packaging material of the present invention, it is preferable on the back side of the transparent plastic film on the surface from the viewpoint of safety and health.

The method of laminating and bonding is not particularly limited, either, and can be freely selected from dry lamination, extrusion lamination, and heat lamination. Further, the above configuration is not limited to use as a film in advance, and for example, a polyethylene film layer is formed on a heat-resistant film by extrusion lamination, or a laminated film is produced at a time by a co-extrusion method and used. It is also possible.

The thickness of the plastic film used in the construction of the present invention is preferably from 10 to 100 μm from the viewpoint of packaging suitability, handling strength, ease of perforation, etc. This is not the case.

In the present invention, as a method of perforating an unpenetrated microporous material having at least a residual film portion left in a packaging material, a mechanical perforation method including a chemical pretreatment, a laser-light perforation method,
Various types of perforation methods such as an electron irradiation perforation method, a plasma perforation method, a high-pressure discharge perforation method and the like can be applied, but the high-pressure discharge perforation method is preferable and effective.

As the high-pressure discharge perforation method, any of a spark gap method, a vacuum tube method, and a solid state method can be applied, but the solid state method is a preferable method. Perforation by the high-pressure discharge perforation method is performed by passing a target packaging material while applying a high voltage between a discharge electrode and a dielectric roll to cause discharge. The perforation density and perforation depth are appropriately adjusted according to the distance between the discharge electrode and the dielectric roll, the voltage, the shape of the discharge electrode, the characteristics of the dielectric roll, and the like. In this case, the thickness, material,
Adjustment is also required depending on the passing speed

In order to form the non-penetrated microporous material of the present invention, it is not sufficient to simply pass a target packaging material while discharging while applying a high voltage between the discharge electrode and the dielectric roll. Ingenuity is required. As one of the pretreatments, it is also effective to carry out a pretreatment step in which fine scars are mechanically formed with a file-like roll before discharging. Alternatively, it is also effective to subject the film to acid treatment to form a polar group on the film surface, and then perform discharge perforation. Furthermore, in order to provide a local discharge portion on the dielectric roll, it is also possible to disperse missing portions in the coated dielectric layer, or to use a dielectric layer in which a conductive material is dispersed to reduce the perforation density and the perforation depth. It is effective for adjustment.

As the material of the electrode used, aluminum, stainless steel or the like is used, and aluminum is preferably used. As the shape of the electrode, a knife edge type, a bar type, a shoe type, or the like is used, but a knife edge type or a shape in which the tip of the discharge portion has a number of needles is preferable. The processing power needs to be adjusted depending on the thickness, material, passing speed, and the like of the packaging material to be perforated, but is, for example, in the range of 5 to 200 W / m ² / min. The drilling direction is such that the remaining film portion side is in contact with the dielectric roll.

The gas permeability represented by the oxygen permeability of the liquid-permeable gas-permeable packaging material according to the present invention is preferably determined by the perforation density, perforation depth (remaining membrane thickness), and pore diameter when the packaging material is perforated. Can be adjusted. Drilling density of 1,000
It is perforated in the range of 1010,000,000 holes / cm ² , preferably 10,000 holes / cm ² or more, more preferably 50,000 holes / cm ² or more in order to secure a sufficient oxygen permeability.

The depth of perforation, that is, the remaining film portion at the time of non-through hole perforation, has a thickness in a practical range in consideration of the characteristics of the packaging material, the strength of the packaging material of the remaining film portion, and the like according to the desired oxygen permeability. Is adjusted accordingly. Normally, the thickness of the remaining film portion is required to be 0.5 μm or more from the top of the strength of the packaging material, and is adjusted within a range of 10 μm or less to secure a sufficient oxygen permeability.
It is preferable to adjust within the range. The pore size is similarly adjusted in consideration of oxygen permeability, packaging material strength, and the like. However, when a printed pattern is printed, it is difficult to determine the printed pattern if the pore size is too large. Is adjusted in the range. The pore size can be determined from one side or both sides of the packaging material, and is selected in consideration of desired oxygen permeability, characteristics of the packaging material, and strength of the remaining film portion.

The gas permeability represented by the oxygen permeability of the liquid-permeable gas-permeable packaging material of the present invention is adjusted according to the oxygen permeability required by the quality preservative to be packaged. A practical range of oxygen permeability is at least 10,000 cc / m ² · 24Hr · atm, preferably at least 50,000 cc / m ² · 24Hr · atm, more preferably at least 100,000 cc / m ² · 24Hr · atm. is there. According to the present invention, by providing the above-mentioned non-penetrating perforations in the material having the above constitution, the oxygen permeability can be increased to 10,000 cc / m ^2.
-It is possible to obtain a gas-permeable packaging material having excellent liquid resistance while maintaining the pressure at 24 Hr.atm or more, and it is possible to provide functions that cannot be obtained with conventional gas-permeable packaging materials.

In order to produce a liquid-resistant quality preservative package using the above-mentioned liquid-permeable and breathable packaging material, a three-way sealing method or a four-way sealing method is generally employed. Three-way sheet
In the sealing method, the packaging material is guided to a three-way seal-type automatic filling and packaging machine, folded in two with the seal layer side inside, and an appropriate amount of a deoxidizer or It is manufactured by filling contents such as other quality preservatives. In the four-way sealing method, two sets of packaging materials are guided to a four-way seal automatic filling and packaging machine while facing each other with the seal layer facing inward, and the deoxygenating agent is applied while the peripheral portion of the bag is thermally sealed. It is manufactured by filling contents such as.

A typical example of the quality preserving agent packaged in the package of the present invention is an oxygen scavenger. Deoxidizers include, for example, sulfites, bisulfites, dithionites, hydroquinone, catechol, resorcinol, pyrogallol, gallic acid, rongalit, ascorbic acid and / or its salts, isoascorbic acid and / or its salts, Sorbose, glucose, lignin, dibutylhydroxytoluene, butylhydroxyanisole, ferrous salt, or a composition containing a metal powder such as iron powder,
Those having a deoxidizing ability, a carbon dioxide generating type deoxidizing ability, a carbon dioxide absorbing type deoxidizing ability, and the like are used. The shape of the quality preserving agent is not particularly limited, such as powder, granules, lump, and sheet. Further, a sheet obtained by mixing an oxygen scavenger with pulp or the like, a sheet obtained by mixing with a thermoplastic resin or the like,
A deoxidizing material or the like in which a polymer material and a metal catalyst are blended is also used, and the quality maintaining agent is not limited to a shape, a composition, and the like.

[0028]

Next, the present invention will be described in more detail with reference to examples.
Note that the present invention is not limited to this embodiment. Example 1 Polyethylene terephthalate film (thickness: 12 μm)
Was subjected to character printing and white solid printing on the back surface, and an extruded laminate of polyethylene to a thickness of 30 μm was obtained. This laminate film was perforated with a density of 110,000 holes / cm ² from the polyethylene terephthalate film side by a solid state discharge treatment machine to obtain a liquid-permeable and air-permeable packaging material. At this time, the thickness of the non-penetrating film portion was 5 μm. The liquid-permeable gas-permeable packaging material slit to a width of 100 mm is led to a three-way seal-type automatic filling and packaging machine, folded in two with the polyethylene side inward, and heat-sealed at the periphery of the bag to remove the iron-based material. Fill and package 3g of oxygen agent, 50
An oxygen absorber package of × 50 mm was obtained. This oxygen absorber package was sealed in a bag of 200 × 300 mm vinylidene chloride stretched nylon / polyethylene with 250 ml of air and stored at 25 ° C. Thereafter, the change over time in the oxygen concentration in the bag was measured using an oxygen analyzer, and the oxygen concentration was measured at 0.1%.
% Was calculated.

COMPARATIVE EXAMPLE 1 The same oxygen-absorbing agent package was obtained using a laminated film having the same structure as in Example 1 without perforating. 2 as in the first embodiment
00 × 300 mm vinylidene chloride stretched nylon /
It was sealed in a polyethylene bag with 250 ml of air and stored at 25 ° C. Thereafter, the change over time in the oxygen concentration in the bag was measured using an oxygen analyzer, and the time required for deoxygenation until the oxygen concentration reached 0.1% or less was calculated. The results are shown in Table 1 together with the results of Example 1.

[Table 1]

Example 2 Polymethylpentene film (thickness: 30 μm) and heat seal
Luminous nonwoven Elves (Unitika, basis weight 30g /
m ² ) was dry-laminated to obtain a laminated sheet. The laminated sheet was discharged from the polymethylpentene film side by a solid state discharge treatment machine at 80,000 holes / cm.
Non-through holes were perforated at a density of ² to obtain a liquid-permeable and breathable packaging material. At this time, the thickness of the non-penetrating film portion was 5 μm. 10
The liquid-permeable gas-permeable packaging material slit to a width of 0 mm is guided to a three-way seal-type automatic filling and packaging machine, folded in two with the polyethylene side inward, and heat-sealed at the periphery of the bag to remove the iron-based material. 3 g of the oxygen absorber was filled and packaged to obtain a 50 × 50 mm oxygen absorber package. This oxygen-absorbing agent package was put in a 200 x 300 mm vinylidene chloride container with 100 g of soy sauce pickled takuan.
G Enclosed in a nylon / polyethylene bag and sealed.
And stored at 35 ° C. while irradiating with a fluorescent lamp. Then, two weeks after storage, the oxygen concentration in the bag was analyzed, the quality of Takuan was confirmed, and the state of the oxygen scavenger package was observed.

COMPARATIVE EXAMPLE 2 A polyethylene terephthalate film whose pores were previously perforated with a hot needle and a water- and oil-resistant paper were laminated and adhered to a polyethylene film whose pores were previously perforated with a hot needle, using a breathable packaging material. The same oxygen absorber package as in Example 2 was obtained. The same test as in Example 2 was performed using this oxygen absorber package.

Comparative Example 3 The same test as in Example 2 was conducted using the oxygen-absorbing agent package obtained in Comparative Example 1. The results are shown in Example 2 and Comparative Example 2.
The results are shown in Table 2 together with the results.

[Table 2]

From the results, it can be seen that the example exhibited a sufficient quality maintaining function, was excellent in liquid resistance, and maintained the state of the oxygen scavenger package well. On the other hand, in Comparative Example 2, the liquid resistance of the oxygen scavenger package was insufficient, and rust and stains were generated.
It is presumed that the liquid in the bag permeated into the package and oxygen absorption stopped, and oxygen intruding from outside the bag could not be completely removed, and the oxygen concentration in the bag was rising. Comparative Example 3
However, the oxygen permeability was so small that a sufficient quality maintaining effect could not be obtained.

[0034]

According to the present invention, a non-penetrated microporous film or sheet is perforated to leave a non-penetrated membrane portion, and has a liquid permeability of 10,000 cc / m ² · 24 Hr · atm or more. Excellent liquid resistance quality that solves the problems of the conventional quality preservative package by adopting a structure in which the quality preservative is packaged and sealed by using the water-resistant packaging material as the whole or a part of the package. A retainer package is obtained. That is, by perforating the non-penetrated microporous, sufficient air permeability as a quality preservative package is secured, and at the same time, extremely excellent liquid resistance is obtained by leaving a non-penetrated membrane portion, and desired air permeability is obtained. It has a sufficient quality maintenance function and exhibits extremely excellent liquid resistance in terms of liquid impermeability and liquid strength. In particular,
When applied to a liquid article or a highly watery article, the liquid does not wet the quality preservative or exudes the quality preservative, and is excellent in function and safety and health. Therefore, it is suitable for sequestering a quality preservative or a quality preservative in which leakage of contents is a problem for a high-moisture article.
It can be effectively used not only in the field of foods such as fruits and vegetables, but also in a wide range of fields such as metal parts and pharmaceuticals.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a liquid-permeable and breathable packaging material comprising a heat-resistant film / heat-sealing film laminated sheet.

FIG. 2 is a cross-sectional view of a liquid-permeable and breathable packaging material comprising a laminated sheet of a heat-resistant film / nonwoven fabric or a microporous film.

FIG. 3 is a cross-sectional view of a liquid-permeable and breathable packaging material comprising a laminated sheet of a heat-sealing film.

FIG. 4 is a cross-sectional view of a quality preservative package using liquid-permeable and breathable packaging materials on both sides.

FIG. 5 is a cross-sectional view of a quality preservative package using a liquid-permeable and breathable packaging material on one side.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat-resistant film 2 Heat-sealing film 3 Non-penetrating microporous 4 Liquid-permeable and gas-permeable packaging material 5 Nonwoven fabric or microporous membrane 6 Heat-sealing film 7 Quality preservative or sheet quality preservative 8 Other packaging materials

Claims (5)

(57) [Claims] 1. A quality preservative package obtained by packaging and sealing an oxygen scavenger comprising a composition containing metal powder using a packaging material, wherein the packaging material is a heat-resistant film and a seal. A laminated film obtained by laminating and bonding a heat-resistant film, wherein at least a non-penetrated microporous material having a non-penetrated remaining film portion left on the sealable film side is perforated from the heat-resistant film side, thereby reducing oxygen. A liquid-resistant quality preservative package, which is a liquid-permeable gas-permeable material having a permeability of 10,000 cc / m ² · 24 Hr · atm or more. 2. A quality preservative package obtained by packaging and sealing an oxygen scavenger comprising a composition containing metal powder using a packaging material, wherein the packaging material is a heat-resistant film alone or a heat-resistant film. A laminated sheet formed by laminating and bonding a laminated film obtained by laminating and bonding a sealable film to a film, and a heat-sealing nonwoven fabric, various microporous films or water-resistant nonwoven fabrics. A liquid-permeable gas-permeable material having an oxygen permeability of 10,000 cc / m ² · 24 Hr · atm or more by piercing a non-penetrated microporous material having a non-penetrated residual film portion on the sheet from the heat-resistant film side. A liquid-resistant quality preservative package. 3. A quality preserving agent package obtained by packaging and sealing an oxygen scavenger comprising a composition containing metal powder by using a packaging material, wherein the packaging material is heat sealable. Oxygen permeability is 10,000 cc by making a single film, non-penetrating microporous with the remaining film part left from the opposite side of the heat-sealing surface.
/ M ² · 24Hr · atm or more, liquid-resistant air-permeable material, liquid-resistant quality preservative package. 4. A quality preservative package obtained by packaging and sealing an oxygen scavenger comprising a composition containing metal powder using a packaging material, wherein the packaging material is a heat-resistant film alone or a heat-resistant film. A laminated film formed by laminating and adhering a sealable film to a film, wherein a non-penetrated microporous material having a non-penetrated remaining film portion left in the laminated film is perforated from the heat-resistant film side. A liquid-resistant quality preservative package, which is a liquid-permeable and gas-permeable material having an oxygen permeability of 10,000 cc / m ² · 24 Hr · atm or more. 5. A method of drilling a blind microporous leaving the remaining film portion of the non-through is a high-pressure discharge perforation method, of claim 1
A liquid-resistant quality preservative package according to any one of the preceding claims.