JP3183302B2 - Liquid-resistant breathable packaging material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The breathable packaging material according to the present invention is applied to various quality preserving agents such as a deoxidizer, a carbon dioxide gas absorbent, an ethylene absorbent, a desiccant, a rust preventive and the like. It is used as a liquid-resistant and breathable material for the purpose of isolating it from the target object. The liquid-permeable and breathable packaging material according to the present invention is particularly excellent in liquid resistance and the effect of preventing the leakage of the quality preservative, and is used for isolating the quality preservative from which the leakage of the quality preservative or the contents of a high moisture article becomes a problem. It is suitable for use in the isolation and packaging of quality preservatives in a wide range of fields such as metal parts and pharmaceuticals as well as in the food field such as foods, beverages and fruits and vegetables.

[0002]

2. Description of the Related Art As a quality preserving agent which is separated and packaged from a target article by a breathable packaging material, a deoxidizing agent, a carbon dioxide absorbent, an ethylene absorbent, a desiccant, a rust inhibitor and the like are exemplified.
Above all, quality preservative packages such as oxygen scavengers have recently been widely used mainly for foods. However, there is a wide variety of foods that are subject to quality preservation, and there are many foods and beverages that are difficult to apply due to the generation of stains and rust due to the contents of conventional oxygen-absorbing packaging using a breathable packaging material. is there.

[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 disadvantages, Japanese Patent Application Laid-Open No. 53-51096 discloses a method in which holes are made in two plastic films having different melting points, and these are laminated as they are or laminated and bonded 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 similarly 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 and packaging materials for isolation. 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 and leak the contents.

Further, plastic films having high oxygen permeability (eg, polyethylene, polymethylpentene,
When a film such as polybutadiene) is used as an isolating material for a quality preservative such as a package of oxygen scavengers, the oxygen permeability required for obtaining a practically sufficient oxygen absorption rate is high, although it has 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.

[0006] As described above, a problem of a package in which a quality preserving agent represented by an oxygen scavenger is isolated and packaged by a conventional air-permeable packaging material is one of the problems in terms of liquid resistance and liquid resistance. There is also a problem of stains and rust migration of the contents, causing problems in safety and hygiene when applied to humid foods, beverages, liquid pharmaceuticals, etc., and ensuring sufficient oxygen permeability for practical use Was difficult.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the conventional packaging material for preserving a quality preservative, and to provide a safe product 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 gas-permeable packaging material for isolating a quality preservative, which has no problem in hygiene and has practically sufficient gas permeability.

[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 liquid-permeable and breathable packaging material for isolating the quality-preserving agent according to the present invention is a film or sheet that has a non-penetrated microporous hole and a non-penetrated membrane part,
Oxygen permeability must be 10,000 cc / m ² · 24 Hr · atm or more.

Hereinafter, the present invention will be described in detail. Examples of the liquid-permeable and breathable packaging material according to the present invention include those having the following configurations. (1) Polyethylene terephthalate, polyamide, polypropylene, polycarbonate, cellophane, films made of trimethylpentene or polyvinyl alcohol, etc., polyvinylidene chloride coated films, aluminum foil laminated films, or heat-resistant films such as aluminum evaporated films, polyethylene, 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 of synthetic pulp, etc., polyethylene, polypropylene, etc. (for example, "Serpore" manufactured by Sekisui Chemical, "Polarum" 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 material for isolating the 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, passage 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
Perforated in the range of 1010,000,000 holes / cm ² , in order to ensure a sufficient oxygen permeability, the above range is preferably 10,000 holes / cm ² or more, more preferably 50,000 holes / cm ² or more.

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 gas permeability represented by the oxygen permeability of the liquid-permeable and breathable packaging material of the present invention is adjusted according to the oxygen permeability required by the quality preservative to be packaged separately. Practical range of oxygen ^{permeability, 10,000cc / m 2 · 24Hr ·} at
m or more, preferably 50,000 cc / m ² · 24Hr · atm
It is more preferably at least 100,000 cc / m ² · 24 Hr · atm. According to the present invention, by providing the above-mentioned non-penetrated perforations in the material having the above constitution, the oxygen permeability can be increased to 10,000 cc / m.
While a ² · 24Hr · atm or more, than it is possible to obtain excellent breathability packaging material liquid resistance, it can impart a function which can not be obtained by conventional breathable packaging material.

That is, according to the structure of the present invention, extremely excellent liquid resistance is imparted by leaving a non-penetrating membrane portion while securing oxygen permeability enough to exert the function of a quality preservative more than enough. Moreover, it becomes possible to obtain a heat-sealing liquid-permeable and breathable packaging material. The liquid-permeable and breathable packaging material constructed according to the present invention is applied with various quality preservatives and quality preservatives such as a deoxidizer, a carbon dioxide gas absorbent, an ethylene absorbent, a desiccant, and a rust preventive. Used as a liquid-resistant and breathable material for the purpose of separating the
In particular, it has excellent liquid resistance and an effect of preventing leakage of the quality preservative.

A typical example of the quality maintaining agent in 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 carbon dioxide generation type deoxidizing ability or a carbon dioxide absorption type deoxidizing ability are used. The shape of the quality preserving agent is not particularly limited, such as powder, granules, lump, and sheet. Also,
A sheet obtained by mixing an oxygen scavenger with pulp or the like, a sheet mixed with a thermoplastic resin or the like, and an oxygen scavenger obtained by blending a polymer material and a metal catalyst are also used.
Then, a quality preserving agent package in which these quality preserving agents are packaged in a breathable packaging material may be used. The quality maintaining agent is not limited to the shape, the composition, and the like.

The following forms are examples of the form of isolated packaging of a quality preservative using the excellent liquid-permeable and breathable packaging material of the present invention. (1) A form in which a liquid preserving agent or the like is covered with a liquid-permeable and breathable packaging material of the present invention so as to cover and adhere to a part of a gas-barrier container or bag in which articles are stored. (FIGS. 4 and 5 ) (2) A quality preserving agent is arranged between the lid of the gas barrier container storing the articles and the container main body, and is separated by the liquid-permeable and breathable packaging material of the present invention. Heat sealing the lid and the container body through a liquid-permeable and breathable packaging material. (FIG. 7 ) (3) A form in which a quality preserving agent is isolated in a gas barrier-containing article storage bag formed with the liquid-permeable and breathable packaging material of the present invention interposed therebetween. (Fig. 6 ) (4) Put the quality holding material in the lid or cap of the bottle,
Form isolated by the liquid-permeable and gas-permeable packaging material of the present invention (FIG. 8 ) (5) A liquid-permeable and gas-permeable packaging material of the present invention in which an oxygen-absorbing material or the like is disposed on the inner wall of a gas-barrier container or bag containing articles. Is used as a separator. (FIG. 9 ) (6) An embodiment in which the quality preservative package (FIG. 10 ) formed of the liquid-permeable and breathable packaging material of the present invention is directly disposed inside a gas-barrier article storage container or bag.

[0029]

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 laminated film was perforated with a density of 60,000 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 part is 5
μm. On the other hand, an oxygen absorber package (filled with 3 g of iron-based oxygen absorber, 50 × 50 mm) using a breathable packaging material in which a paper (basis weight 40 g / m ² ) and a perforated polyethylene film (thickness 40 μm) are laminated and bonded. ) Was prepared and isolated in a 200 × 300 mm vinylidene-coated stretched nylon / polyethylene bag using the above liquid-permeable and breathable packaging material (80 × 80 mm). The isolated bag with the oxygen absorber package was filled with 100 g of soy sauce-cooked takuan, sealed 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 1 The laminated film of Example 1 was used without perforation as an isolating material for the oxygen-absorbing agent package, and the oxygen-absorbing agent package was isolated in the same manner as in Example 1. The same test as in Example 1 was performed on the obtained bag with the oxygen scavenger package.

COMPARATIVE EXAMPLE 2 As a separating material for the oxygen-absorbing agent package, the laminated film of Example 1 was used in which 20 through-holes were perforated with a needle having a diameter of 1 mm. I isolated my body. The same test as in Example 1 was performed on the obtained bag with the oxygen scavenger package. The test results are shown in Table 1 together with the results of Example 1 and Comparative Example 1.

[Table 1]

According to the results shown in Table 1, in Example 1, the oxygen-absorbing agent package exerts a sufficient quality maintaining function by the effect of the isolating material, and has excellent liquid resistance and a good condition of the oxygen-absorbing agent package. Was held in. On the other hand, in Comparative Example 1, the oxygen permeability of the isolating material was small, and the quality maintaining effect of the oxygen scavenger package was not exhibited. Further, in Comparative Example 2, the liquid of the isolation material was insufficient in liquid resistance, and the liquid of the soaked wetted oxygen absorber, the oxygen absorption stopped halfway, and the oxygen absorber itself stained and rusted. .

Example 2 A non-through hole having a density of 70,000 holes / cm ² was perforated in a polyethylene film (thickness: 30 μm) using a solid state discharge treatment machine to obtain a liquid-permeable and gas-permeable packaging material. At this time, the thickness of the non-penetrating film part was 4 μm. On the other hand, paper (basis weight 40 g / m ² ) and perforated polyethylene film (thickness 4
Oxygen-absorbing package using a breathable packaging material (0 μm) (3 g of iron-based oxygen absorbing agent, 50 × 50 mm size)
Was prepared. Separate bags of 200 × 300 mm were made by combining the above-mentioned liquid-permeable and air-permeable packaging material with two packaging materials made of vinylidene-coated stretched nylon / polyethylene. The oxygen scavenger package was sealed on one side of the isolation bag, and the other was sealed with 200 ml of soy sauce and 100 ml of air, sealed and sealed, and stored at 25 ° C. under fluorescent light irradiation. Then, two weeks after storage, the oxygen concentration in the bag was analyzed, the quality of the soy sauce was confirmed, and the state of the oxygen absorber package was observed.

Comparative Example 3 The laminated film of Example 1 was used without perforation as an isolating material for the oxygen scavenger package, and the oxygen scavenger package was isolated in the same manner as in Example 2. The same test as in Example 2 was performed on the obtained bag with the oxygen absorber package.

Comparative Example 4 As a separating material for the oxygen scavenger package, the laminated film of Example 1 having 20 through holes perforated with a needle having a diameter of 1 mm was used. I isolated my body. The same test as in Example 2 was performed on the obtained bag with the oxygen absorber package. The test results are shown in Table 2 together with the results of Example 2 and Comparative Example 3.

[Table 2]

From the above results, in Example 1, the oxygen-absorbing agent package exerts a sufficient quality maintaining function by the effect of the isolating material, and also has excellent liquid resistance and the state of the oxygen-absorbing agent package is well maintained. Was. On the other hand, in Comparative Example 3, the oxygen permeability of the isolating material was small, and the quality maintaining effect of the oxygen scavenger package was not exhibited. Further, in Comparative Example 4, the liquid resistance of the isolation material was insufficient, soy sauce wetted the oxygen scavenger package, oxygen absorption was stopped halfway, and the oxygen scavenger package itself stained.

[0037]

According to the present invention, the packaging material for isolating a quality preservative is
A non-penetrating microporous material is formed in the film or sheet, leaving a non-penetrating ultra-thin film, and having a oxygen permeability of 10,000 cc / m ² · 24 Hr · atm or more. As an isolation packaging material, it has a sufficient air permeability and exhibits extremely excellent liquid resistance in terms of liquid impermeability, liquid resistance, and the like. In particular, when applied to liquid or high moisture products,
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 isolating a quality preservative or a quality preservative in which leakage of contents is a problem with respect to a high moisture product.
It can be widely used for isolation and packaging of quality preservatives in a wide range of fields, such as metal parts and pharmaceuticals, as well as food fields such as foods, beverages and fruits and vegetables.

[Brief description of the drawings]

FIG. 1 Lamination of heat-resistant film / heat-sealing film
Sectional drawing of the liquid breathable packaging material which consists of a sheet.

FIG. 2: Heat resistant film / nonwoven fabric or microporous membrane product
Sectional drawing of the liquid breathable packaging material which consists of a layer sheet.

FIG. 3 shows a heat-resistant film made of a laminated sheet.
Sectional drawing of a liquid breathable packaging material .

FIG. 4 is a liquid preserving agent made of a liquid-permeable and breathable packaging material in a part of a bag .
FIG. 2 is a cross-sectional view of an article storage bag in which is isolated.

[Fig. 5] The quality is maintained with a liquid-permeable and breathable packaging material for a part of the container .
Sectional drawing of the goods storage container which isolate | separated the agent.

FIG. 6: A liquid preserving agent is used between the bag material and the liquid-permeable breathable packaging material.
Sectional view of the article storage bag isolated via a charge.

FIG. 7 is a liquid-permeable and breathable packaging of a quality preservative between container lids .
Sectional drawing of the goods storage container isolated via the material.

[FIG. 8] A sheet-like quality preservative is made of a liquid-permeable and breathable packaging material.
Sectional drawing of the lid or cap of the isolated goods storage container.

FIG. 9: Non-breathable external material / sheet-like quality preservative / liquid resistance
A container or container made of a temper
Is a partial sectional view of the outer wall surface of the bag.

FIG. 10 is a cross- sectional view of a liquid-permeable and breathable packaging material of the present invention .
Quality preservative packaging.

Claims (7)

(57) [Claims] 1. A laminated film obtained by laminating and bonding a heat-sealing film to a heat-resistant film, and penetrating the heat-resistant film from the heat-resistant film side and not penetrating at least to the heat-sealing film side. Oxygen permeability is 10,0
A liquid-permeable and breathable packaging material for isolating a quality preservative, characterized by being at least 00 cc / m ² · 24Hr · atm. 2. A heat-resistant film alone or a heat-resistant film laminated with a heat-sealing film and a heat-sealing nonwoven fabric, a microporous film or a water-resistant nonwoven fabric. A laminated sheet comprising a non-penetrated microporous material having at least a non-penetrated remaining film portion formed in the laminated sheet from the heat-resistant film side, so that the oxygen permeability is 10,000 cc / cm. A liquid-permeable and breathable packaging material for isolating quality preservatives, characterized by having a m ² · 24Hr · atm or more. 3. A single film having a heat sealing property, wherein a non-penetrated microporous material having a remaining film portion left from a side opposite to a heat seal surface is provided so that oxygen permeability is improved. 10,000cc / m ² · ²
A liquid-permeable and breathable packaging material for isolating quality preservatives, characterized by having a viscosity of at least 4 hr · atm. 4. A laminated film obtained by applying a hot melt as a seal layer to a heat-resistant film alone or a laminated film obtained by laminating and bonding a heat-sealing film to the heat-resistant film. Oxygen permeability is at least 10,000 cc / m ² · 24 Hr · atm by perforating a non-penetrated microporous material having a non-penetrated remaining film portion at least from the side of the laminated film. Liquid-resistant and breathable packaging material for sequestering agent isolation. 5. The liquid-permeable and air-permeable packaging material according to claim 1, which has an oxygen permeability of not less than 50,000 cc / m ² · 24 Hr · atm. 6. The liquid-permeable and air-permeable packaging material according to claim 1, which has an oxygen permeability of 100,000 cc / m ² · 24 Hr · atm or more. 7. An unpenetrated microporous material having an unpenetrated residual film portion,
2. The method according to claim 1, which is formed by a high-pressure discharge drilling method.
The liquid-permeable and breathable packaging material according to any one of Items 1 to 4.