JPH03305B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to packaging materials, and more specifically, it includes a non-breathable outer material, a sealing layer, a breathable inner material,
and a breathable sealing layer, the sealing layer is arranged between a non-breathable outer material and a breathable inner material, and the outer material and the sealing layer are laminated and bonded, so that the sealing layer and the breathable A breathable inner material is arranged between the breathable inner material and the breathable seal layer, and the breathable inner material and the breathable seal layer are laminated and bonded, and the cut surface of the breathable inner material and the breathable inner material are bonded together. The present invention relates to a packaging material that is breathable through a sealing layer. [Prior Art] Conventionally, breathable packaging materials have been used to package various drugs such as desiccants, insect repellents, oxygen scavengers, and freshness-preserving agents. In some cases, important requirements for air-permeable packaging materials include water resistance, breakage resistance, safety and hygiene, food flavor retention, performance stability during handling, etc. in addition to air permeability. For example, packaging materials for oxygen absorbers have traditionally been
A laminated adhesive of paper and perforated polyethylene film was used, and the air permeability in this case was adjusted by the porosity of the polyethylene film. However, when this oxygen absorber is applied to foods with a high moisture content, the packaging material has poor water resistance.
If the oxygen absorber becomes wet, the packaging bag of the oxygen absorber may be damaged, or the contents may seep through the holes in the perforated polyethylene film, which is unfavorable in terms of food safety and hygiene.In addition, the rate of oxygen absorption is slow due to moisture. There were cases where it happened. Further, in controlling the air permeability, there are drawbacks such as deformation of the air holes during thermal bonding during the production of the packaging material, making the air permeability unstable and causing variations in oxygen absorption rate. As a packaging material that improves the above drawbacks, JP-A-53
Japanese Patent Application No. 51096 discloses a packaging material in which two plastic films having different melting points are made with holes and are either stacked on top of each other or laminated and bonded with paper sandwiched between them. Furthermore, Japanese Patent Application Laid-open No. 56-124440 or Japanese Patent Application Laid-Open No. 56-124441 discloses a packaging material using a plastic film having holes in its surface. However, in these cases, the surface is made of plastic film, which improves water resistance compared to paper, but since there are many holes perforated to provide breathability, food products with a high moisture content are produced. When it comes into contact with food, the packaging material becomes wet and the contents ooze out, causing health and safety problems, and it is also weak in strength. Furthermore, since the packaging materials are thermally bonded or adhesives are used during the manufacturing process, there are also disadvantages such as holes being deformed and air permeability changing due to the influence of the adhesive. In addition, when applied to humid foods, the surface plastic film and paper peeled off, making it impossible to use it as a packaging material for oxygen absorbers or alcohol-based freshness-preserving agents. In addition, when oxygen absorbers and freshness-preserving agents using conventional packaging materials are applied to foods such as coffee, tea, grated yam kelp, and peanuts that require aroma retention,
Problems such as the scent changing or becoming weaker were pointed out. Furthermore, when using a large number of oxygen absorbers, the oxygen absorbers connected in a band shape are cut and inserted using an automatic cutting and feeding machine, but in this case, oxygen absorbers using conventional packaging materials cannot be packaged. Since oxygen in the atmosphere is quickly absorbed from the surface of the material, the oxygen absorption capacity decreases during use, and the last strip oxygen absorber may noticeably reduce the oxygen absorption rate or stop oxygen absorption midway. It had the drawback of stopping. [Problems to be Solved by the Invention] The purpose of the present invention is to solve the above-mentioned problems of the conventional packaging materials, and to create a material that does not cause safety and health problems even when applied to humid foods, and has high strength. To provide a packaging material that is large, has stable air permeability, and is excellent in retaining the aroma of food. Furthermore, it is an object of the present invention to provide a packaging material that does not have the problem of performance deterioration during handling in a strip-shaped continuous package and has excellent performance stability during handling. [Means for Solving the Problems] The present inventors conducted intensive research in view of the problems of the above-mentioned prior art, and as a result, completed the present invention. That is, the present invention comprises a non-breathable outer material, a sealing layer, a breathable inner material, and a breathable sealing layer, and the sealing layer is provided between the non-breathable outer material and the breathable inner material. is arranged, and the outer material and the sealing layer are laminated and bonded, and the inner material having air permeability is arranged between the seal layer and the sealing layer having air permeability, and the inner material having air permeability and the air permeable inner material have air permeability. A packaging material in which a sealing layer is laminated and adhesively bonded, and the sealing layer and an air permeable inner material are laminated and adhesively bonded at the periphery of the cut portion during packaging,
The present invention provides a double packaging material that is characterized by allowing air to pass through the cut surface of the air-permeable inner material and the air-permeable seal layer. The packaging material of the present invention consists of a non-breathable outer material, a sealing layer, a breathable inner material, and a breathable sealing layer. Each layer is stacked in the order of non-breathable outer material/seal layer/breathable inner material/breathable seal layer, and the non-breathable outer material and seal layer are stacked together, and the breathable inner material is stacked in the following order. It has a structure in which air-permeable sealing layers are laminated and bonded together. That is, the packaging material of the present invention:
A sheath layer is arranged between a non-breathable outer material and a breathable inner material, and the outer material and the sealing layer are laminated and bonded, and breathability is provided between the sealing layer and the breathable sheath layer. The air permeable inner material and the air permeable seal layer are laminated and bonded together. In the present invention, examples of the non-breathable outer material include films made of polyethylene terephthalate, polyamide, polypropyline, polycarbonate, cellophane or polyvinyl alcohol, various films coated with polyvinylidene chloride,
Examples include aluminum foil laminate films and various aluminum vapor-deposited films. Among these, polyethylene terephthalate film or polyamide film is preferred in consideration of strength, ease of manufacturing, etc. The thickness of the film constituting the non-breathable outer material is preferably 50 μm or less, particularly preferably 10 to 20 μm, from the viewpoint of ease of handling during manufacturing. The air permeability of the non-breathable outer film is oxygen permeability 1000ml/m ² 24hr
ATM or less is preferred, and 500ml/m ² 24hr ATM or less is particularly preferred. In the present invention, the sealing layer is used to bond the non-breathable outer material and the breathable inner material when manufacturing the packaging material. As the sealing layer, for example, a plastic film or a heat sealing agent is used. When a plastic film is used as the sealing layer, for example, a plastic film made of polyethylene, ethylene vinyl acetate copolymer, ionomer resin, polybutadiene or polyvinyl chloride is used. When the sealing layer is a plastic film, the thickness of the film is generally determined from the viewpoint of ensuring sealing strength and ease of handling during manufacturing.
It is 10-70μ, preferably 15-40μ. In addition, when a heat sealing agent is used as the sealing layer, examples of the heat sealing agent include ordinary hot melt agents, hot melt emulsions, ionomer latexes, ionomer resin emulsions, polyethylene emulsions, or ethylene vinyl acetate copolymer emulsions. etc. are used. When the sealing layer is a heat sealing agent, the coating amount is generally 0.5 to 30 g/m ² , preferably 5 to 20 g/m ² . The sealing layer is used by being laminated or coated in close contact with the non-breathable outer material. The sealing layer is not limited to one layer, but two sealing layers may be used depending on the adhesion between the non-breathable outer material and the breathable inner material during bag manufacturing. In this case, a common method is to apply a heat sealant to the surface of the breathable inner material. In the present invention, as the breathable inner material, for example, paper or nonwoven fabric is used. When paper is used as the breathable inner material, any of Japanese paper, rayon-mixed Japanese paper, Western paper, etc. can be used. Among these papers, Japanese paper or rayon-mixed Japanese paper is preferred in consideration of adhesion to external materials and air permeability. In addition, the basis weight of the paper used depends on the air permeability setting, ease of handling,
It is determined by considering the strength, etc., but for example, in the case of Japanese paper, it is preferably 15 to 100 g/m ² . When nonwoven fabric is used as a breathable inner material, wet, dry, or spunbond nonwoven fabrics can be used, and various materials such as polyamide, polyethylene terephthalate, and rayon can be used. Illustrated. The basis weight of the nonwoven fabric to be used is determined in consideration of air permeability, handleability, strength, etc., as in the case of paper, and for example, a nonwoven fabric of 15 to 200 g/m ² is used. Note that in order to impart water repellency or oil repellency to these papers or nonwoven fabrics, it is possible to use paper or nonwoven fabrics coated with a water repellent or oil repellent. In the present invention, the seal layer having air permeability is made of the same material as the seal layer but having air permeability. That is, a plastic film, a heat sealing agent, or the like is used as the material for the breathable sealing layer. When a plastic film is used as the material for the breathable seal layer, examples of the plastic film include those made of polyethylene, ethylene vinyl acetate copolymer, ionomer resin, polybutadiene, polyvinyl chloride, or the like. In addition, when a heat sealing agent is used as a material for the breathable sealing layer, examples of the heat sealing agent include ordinary hot melt agents, hot melt emulsions, ionomer latexes, ionomer resin emulsions, polyethylene emulsions, or ethylene emulsions. Examples include vinyl acetate copolymer emulsion. Examples of methods for imparting air permeability to the material used as the air permeable seal layer include a method of providing holes in a film material (herein, the holes may be referred to as "holes" in this specification), Japanese paper,
A method of laminating a film on a non-woven fabric by thermocompression bonding and creating cracks in the film to impart breathability, and a method of applying a heat sealing agent to the inside of a breathable inner material by a method such as pattern coating to create a breathable sealing layer. A method such as that is adopted. Among the methods of imparting breathability to the material used as the breathable seal layer, a method of providing holes in the film material includes, for example, a method of making holes in the film material and then pasting it on the breathable inner material. Alternatively, a method may be adopted in which the material is pasted on an inner material having air permeability and then holes are made. In the case of the method of attaching to a breathable inner material and then making holes in the seal layer material to impart breathability, if the contents do not leak when the breathable package is created, the breathable inner material There is no problem even if there are holes in the material. It is generally preferable to have as many holes as possible for the purpose of imparting air permeability to the sealing layer material as long as it does not impede adhesion, and in this case the porosity is generally
It is 0.2 to 30%, preferably 1 to 20%. If it is necessary to reduce or increase the air permeability of the package using the packaging material of the present invention,
This objective can be achieved by lowering or increasing the porosity of the breathable sealing layer and by adjusting the quality or thickness of the material used for the breathable inner material. In order to increase the strength of the package using the packaging material of the present invention, for example, split fibers may be placed between the air permeable inner material and the air permeable seal layer, or
It is also possible to adhere and laminate the film in close contact with the inside of a sealing layer having air permeability. Furthermore, it is also possible to bond the split fibers between the non-breathable outer material and the sealing layer or in close contact with the inside of the sealing layer. Furthermore, in the packaging material of the present invention, printing can be applied to the back side of the non-breathable outer material. moreover,
It is possible to perform printing such as character printing on the back side of the non-breathable outer material and then perform solid printing. In the present invention, the combination of a non-breathable outer material and a seal layer, and the combination of a breathable inner material and a breathable seal layer include the seal strength, strength, mechanical suitability, air permeability, etc. of the package. Although it is possible to select and use them as appropriate, for example, the following combinations are preferred. Examples of combinations of outer material/seal layer (1) PET/PE (2) Stretched polyamide/EVA (3) Examples of combinations of PET/ionomer inner material/breathable seal layer (1) Nonwoven polyester fabric/LLDPE (2) Nonwoven polyamide fabric /PE (3) EVA sealant/Water- and oil-proof paper/PE (4) Japanese paper/PE A laminate consisting of these outer materials and a sealing layer, and a laminate consisting of a breathable inner material and a breathable sealing layer. A double packaging material can be obtained by appropriately combining sheets and the like. In order to manufacture a breathable package using the double packaging material according to the present invention, for example, a three-way sealing method or a four-way sealing method is used. In the case of the three-way sealing method, for example, a laminate sheet consisting of a laminate consisting of an outer material and a sealing layer, a breathable inner material and a breathable sealing layer, and a sealing layer and a breathable inner material Place the bags facing each other, guide them into a three-sided sealing automatic filling packaging machine, fold them in half with the breathable sealing layer inside, heat seal only the periphery of the bag, and apply an appropriate amount of oxygen absorber or desiccant, etc. It is manufactured by filling the contents of In the case of the four-way sealing method, for example, a laminate sheet consisting of a laminate consisting of an outer material and a sealing layer, a breathable inner material, and a breathable sealing layer is combined with a sealing layer and a breathable inner material. Two sets of overlapping double packaging materials are placed facing each other with the air-permeable sealing layer on the inside and guided to a four-sided seal automatic filling packaging machine, and while only the periphery of the bag is heat-sealed, an oxygen absorber, etc. It is manufactured by filling the contents of When producing a breathable package using the double packaging material according to the present invention, the dimensions of the laminate consisting of an outer material and a sealing layer are changed to the dimensions of a laminate consisting of an inner material having air permeability and a sealing layer having air permeability. By making the size larger than the size of the sheet, it is possible to obtain a breathable package formed by partially heat-sealing the laminate consisting of the outer material and the sealing layer. When a strip-shaped continuous package is made in this manner, the bag is made of a laminated sheet made of a breathable inner material and a breathable sealing layer, and is wrapped in a laminate made of a non-breathable outer material and a sealing layer. In rare cases, the inner material having air permeability through which ventilation occurs is exposed only at both ends of the continuous package. A breathable package using the packaging material according to the present invention can be used for various purposes such as an oxygen absorber, a desiccant, an insect repellent, and an alcohol-based freshness-preserving agent. In the present invention, the oxygen scavenger includes sulfite,
Bisulfite, dithionite, hydroquinone,
Catechol, resorcinol, pyrogallol, gallic acid, Rongalite, ascorbic acid and/or its salts, isoalkorbic acid and/or its salts, sorbose, glucose, lignin, dibutylated hydroxytoluene, butylated hydroxyanisole, ferrous salts, or An oxygen absorber containing metal powder such as iron powder, a carbon dioxide gas generating type oxygen absorber, a carbon dioxide gas absorbing type oxygen absorber, etc. are used. [Function] The packaging material of the present invention consists of a non-breathable outer material, a sealing layer, a breathable inner material, and a breathable sheath layer, and the non-breathable outer material and the breathable inner material are combined. A sealing layer is arranged between the outer material and the sealing layer, and the outer material and the sealing layer are laminated and bonded, and a breathable inner material is arranged between the sealing layer and the breathable sealing layer. Since it has a structure in which a breathable sealing layer is laminated and bonded, the outer surface formed of the non-breathable outer material of the packaging material is not breathable, and the cut surface of the breathable inner material is non-breathable. Ventilation is performed through the air-permeable sealing layer. When a breathable package is created using the packaging material produced by the method of the present invention, the seal layer and the breathable inner material are laminated and bonded at the periphery of the cut part, and the breathable seal layer and the air-permeable seal layer are sealed. Therefore, ventilation is performed from the cut surface of the breathable inner material through the breathable seal layer. That is, ventilation inside and outside the package is carried out along the route of the cut surface of the breathable inner material←→breathable inner material←→breathable portion of the breathable seal layer. Similarly, the dimensions of the laminate consisting of the outer material and the sealing layer are made larger than the dimensions of the laminate sheet consisting of the breathable inner material and the breathable sealing layer to create a strip-shaped continuous wrap breathable package. In this case, the ventilation part is only at both ends of the continuous package, and when used with an automatic cutting/feeding machine, the ventilation part is exposed only after the continuous package is cut, so the performance may deteriorate until the time of use. There is no. The air permeability of a package using the packaging material of the present invention is mainly controlled by the material and thickness of the breathable inner material, the cross-sectional area of the cut portion of the package, and the like. In the packaging material of the present invention, since the printing is performed on the back side of the non-breathable outer film, the ink does not come into direct contact with the food, so it is hygienically safe.
Furthermore, if solid printing is applied on top of character printing, even if the contents ooze out onto the breathable inner material, there will be solid printing, or concealment printing, which will affect the appearance of the package. There's nothing to lose. Furthermore, the air-permeable packaging body using the packaging material of the present invention has no holes at all on the surface, and therefore has excellent water resistance, oil resistance, and strength. [Example] Next, the present invention will be explained in more detail with reference to Examples. Example 1 Thickness with one color each of text printing and white solid printing on the back side
Laminated film 1 with a width of 70 mm, made by extruding and laminating PE (polyethylene, sealing layer) to a thickness of 40 μ on a 12 μ PET (polyethylene terephthalate) film (non-breathable outer material), and a laminated film 1 with a basis weight of 60 g/m ² Japanese paper (breathable inner material)
It has uniformly distributed pores with a diameter of 1 mm, and the open area ratio is
A laminated sheet 2 having a width of 65 mm and laminated with a 15% perforated polyethylene film (sealing layer having air permeability) was prepared. Next, place the laminated sheet 2 with the laminated sheet 2 inside.
A double packaging material consisting of a laminated film 1 and a laminated film 1 stacked so that PE (1) and Japanese paper (2) face each other is guided to a three-sided seal automatic filling packaging machine, and 1.5% of iron-based oxygen absorber is added to the inside of the breathable sealing layer. The package was filled with 50 g of oxygen absorber, sealed from the outside of the non-breathable outer material using a bar heater, and cut to obtain an oxygen absorber package with dimensions of 50 x 50 mm. Place this oxygen absorber package on hydrated cotton made by soaking 2 g of absorbent cotton in 10 ml of water, and place it on KOP with 500 ml of air.
It was sealed in a laminated film bag made of (polyvinylidene chloride coated stretched polypropylene)/PE and stored in a constant temperature bath at 35°C. The oxygen concentration was analyzed after 2 days, and the condition of the oxygen absorber was observed on the 14th day. The results are shown in Table 1. Comparative Example 1 A packaging material made by laminating pure white paper (basis weight 50 g/m ² ) and perforated polyethylene film with uniformly distributed pores of 1 mm in diameter and a porosity of 10% was used to remove iron. A 50×50 mm oxygen absorber package was obtained by filling 1.5 g of oxygen agent. Using this oxygen absorber package, the same procedure as in Example 1 was carried out.

[Table] The results of the test are shown in Table 1 as Comparative Example 1, together with Example 1. Example 2 Thickness with one color each of text printing and white solid printing on the back side
Laminated film 1 with a width of 60 mm, which is made by extruding and laminating a polyethylene vinyl acetate copolymer film (sealing layer) with a thickness of 40 μ on a stretched polyamide film (non-breathable outer material) with a thickness of 15 μ, and a film with a basis weight of 50 g/m ^2. Water-treated rayon paper (breathable inner material) and uniformly distributed diameter 1
A laminated sheet 2 having a width of 55 mm and having a width of 55 mm was prepared by thermally laminating a perforated polyethylene film (sealing layer with air permeability) having pores of 15% and a porosity of 15%. Next, place the laminated sheet 2 with the laminated sheet 2 inside.
and laminated film 1 so that the sealing layer 1 and the breathable inner material 2 face each other, the double packaging material is guided to a three-sided seal automatic filling and packaging machine, and the inner layer has iron inside the breathable inner material. While filling 1.0 g of the system oxygen absorber, it was sealed from the outside of the non-breathable outer material with a bar heater to obtain a strip-shaped continuous oxygen absorber package with each dimension of 30 x 40 mm and 3000 pieces connected. Ta. This continuous oxygen absorber package was cut at a rate of 40 pieces per minute using an automatic cutting/feeding machine, and the first and second oxygen absorber packages were collected. These oxygen absorber packages were sealed together with 250 ml of air in a laminate film bag made of KOP (polyvinylidene chloride coated stretched polypropylene)/PE and stored at 25°C. The results of oxygen concentration analysis after 2 days are shown in Table 2. In addition, these oxygen absorber packages were placed on hydrated cotton made by soaking 2 g of absorbent cotton in 10 ml of water, sealed with 250 ml of air in a laminate film bag made of KOP (polyvinylidene chloride coated stretched polypropylene)/PE, and heated at 50°C. It was stored in a constant temperature bath. The oxygen concentration was analyzed after 2 days, and the condition of the oxygen absorber was observed on the 14th day. The results are shown in Table 3. Comparative Example 2 Made by laminating a 12μ thick PET film and a 15μ thick PE film, uniformly distributed diameter 1
A porous laminated film with pores of 1 mm in diameter and a porosity of 5%, ^Japanese paper with a basis weight of 35 g/m2, and pores of 1 mm in diameter uniformly distributed and a porosity of 15
% perforated polyethylene film and laminated to have a laminated structure of perforated PET/perforated PE/Japanese paper/perforated polyethylene film. A drug package was obtained. The results of the same tests and measurements as in Example 2 using this continuous oxygen absorber package were compared with Comparative Example 2.

【table】

[Table] The results are shown in Tables 2 and 3 together with Example 2. Example 3 Thickness with one color each of text printing and white solid printing on the back side
Laminated film 1 with a width of 80 mm, which is made by laminating a 12 μ thick PET (polyethylene terephthalate) film (non-breathable outer material) with a 30 μ thick ionomer resin film (sealing layer), and polyamide with a basis weight of 50 g/m ² Laminated with non-woven fabric (breathable inner material) and perforated linear polyethylene film (LLDPE, breathable sealing layer) with uniformly distributed pores of 1 mm in diameter and a porosity of 15%. A laminated sheet 2 with a width of 70 mm was prepared. Next, place the laminated sheet 2 with the laminated sheet 2 inside.
and laminated film 1 so that the sealing layer 1 and the breathable inner material 2 face each other, the double packaging material is guided to a three-sided sealing automatic filling packaging machine, and the inside of the breathable sealing layer is filled with quicklime. The desiccant package was filled with 2 g each and sealed from the outside of the non-breathable outer material using a bar heater, and then cut to obtain a desiccant package with dimensions of 40 x 50 mm. Place this desiccant package on a hydrated cotton ball made by soaking 2 g of absorbent cotton in 10 ml of water, and place it on KOP/
Sealed in a laminated film bag made of PE, 35
It was stored in a constant temperature bath at ℃. After 2 days, remove the wet cotton that had been in contact with it and add 1%
Several drops of phenolphthalene-alcohol solution were added to check for elution of alkaline components. Additionally, the appearance of the desiccant package was observed. The results are shown in Table 4. Comparative Example 3 Japanese paper (basis weight 50g/m ² ) with uniformly distributed pores of 1mm in diameter and a porosity of 15
%, perforated polyethylene film with a thickness of 30μ, and 2g of quicklime using a packaging material laminated with
A desiccant package of 40 x 50 mm was obtained in the same manner as in Example 3. The results of a test similar to that of Example 3 using this desiccant package are shown as Comparative Example 3 in Table 4 together with Example 3.

[Front] Example 4 Thickness with one color each of text printing and white solid printing on the back side
Laminated film 1 with a width of 110 mm, which is made by extruding and laminating PE (sealing layer) to a thickness of 35 μ on a 12 μ PET film (non-breathable outer material), and Japanese paper with a basis weight of 50 g/m ² (breathable inner material) )
It has uniformly distributed pores with a diameter of 1 mm, and the porosity is 10.
A laminated sheet 2 having a width of 120 mm and having a width of 120 mm was prepared by laminating with a perforated polyethylene film (a sealing layer having air permeability). Next, place the laminated sheet 2 with the laminated sheet 2 inside.
and laminated film 1 so that the sealing layer 1 and the breathable inner material 2 face each other, the double packaging material is guided to a three-sided seal automatic filling packaging machine, and the inside of the breathable sealing layer is filled with carbonic acid. Gas absorption type oxygen absorber
While filling 4.0g each, seal from the outside of the non-breathable outer material with a bar heater, and cut it to a size of 60×
A 60 mm oxygen absorbing package was obtained. This oxygen absorber package was sealed in an ON (stretched nylon)/aluminum/PE bag together with 10 g of roasted coffee powder and stored in a constant temperature bath at 60°C. Analyzing the oxygen concentration inside the bag after 7 days,
The package was opened and the scent retention effect was examined through a sensory test. The results are shown in Table 5. Comparative Example 4 Example except that the packaging material was a laminate of pure white paper (basis weight 50 g/m ² ) and a perforated polyethylene film having uniformly distributed pores of 1 mm in diameter and a porosity of 10%. A carbon dioxide absorbing type oxygen scavenger was obtained in the same manner as in 4. The results of the same tests and measurements as in Example 4 using this oxygen absorber package are shown as Comparative Example 4 in Table 5 together with Example 4. Comparative Example 5 Made by laminating a 12μ thick PET film and a 15μ thick PE film, uniformly distributed diameter 1
A porous laminated film with pores of 1 mm in diameter and a porosity of 4%, ^Japanese paper with a basis weight of 50 g/m2, and pores of 1 mm in diameter uniformly distributed and a porosity of 10
% perforated polyethylene film in a laminated structure of perforated PET/perforated PE/Japanese paper/perforated polyethylene film. An oxygen absorber was obtained. The results of the same tests and measurements as in Example 4 using this oxygen absorber package are shown as Comparative Example 5.

〔Effect of the invention〕

Ventilation of the packaging material according to the invention is not done by holes on the surface as in the conventional ones, but
Since the cutting is performed through the cut surface of the breathable inner material, the air permeability of the package is stable with little variation. In particular, when adjusting air permeability at low air permeability levels,
Compared to the method of adjusting the porosity, the packaging material according to the present invention can be adjusted by adjusting the paper quality and thickness of the air permeable inner material, so the air permeability is stable with less variation. When the packaging material according to the present invention is used to create a continuous air-permeable package connected in a band shape, the ventilation portions are only at both ends of the continuous package, and when used in an automatic cutting/feeding machine, the continuous package is Since the ventilation part is exposed only after cutting the body, its performance does not deteriorate until it is used, making it extremely easy to handle. Furthermore, the packaging material according to the present invention can be printed on the back side of the non-breathable outer material, and in this case, the contents such as food and ink do not come into direct contact, so it is hygienically safe. Furthermore, if solid printing (concealing printing) is applied on top of character printing, the appearance of the package will not be impaired even if the contents seep onto the breathable inner material. The packaging material according to the present invention includes a deoxidizing material, a drying material,
Used for various purposes such as insect repellent and alcohol-based freshness preserving agent. The packaging for oxygen absorbers, desiccants, etc. using the packaging material of the present invention uses a non-porous outer material that does not make holes, so the bag has high water resistance and the contents are It never oozes out. Additionally, it is stronger and safer than conventional packaging materials, making it sanitary and safe. In addition, when producing a breathable package using the double packaging material according to the present invention, the dimensions of the laminate consisting of the outer material and the sealing layer may be changed from those of the inner material having breathability and the sealing layer having breathability. By making the size larger than the size of the laminated sheet, it is possible to partially heat-seal the laminate consisting of the outer material and the sealing layer, and the outer material will not peel off even when used in high humidity. Furthermore, when a package for an oxygen absorber or the like using the packaging material according to the present invention is applied to foods, etc. where scent is important, the surface of the package is non-porous, so the scent of the food will enter the bag. Because it is difficult to absorb and come into contact with the oxygen-absorbing composition contained therein, the fragrance does not change in quality or become weak due to adsorption, and has excellent fragrance retention.

[Brief explanation of the drawing]

FIG. 1 shows the structure of one embodiment of the double packaging material according to the invention. FIG. 2 shows a cross section of a perspective view of a breathable package formed by sealing three peripheral edges with the breathable sealing layer 4 of the double packaging material according to the present invention inside. Figure 3 shows a double packaging material in which the dimensions of the laminate consisting of a non-breathable outer material and a sealing layer are larger than the dimensions of a laminate sheet consisting of a breathable inner material and a breathable sealing layer. This is a cross-sectional perspective view of an air-permeable package formed by sealing the peripheral edges on three sides with the air-permeable sealing layer 4 inside. FIG. 4 shows a cross section of a perspective view of a breathable package formed by sealing the four peripheral edges with the breathable sealing layer 4 of the double packaging material according to the present invention inside. Figure 5 shows a double packaging material in which the dimensions of the laminate consisting of a non-breathable outer material and a sealing layer are larger than the dimensions of a laminate sheet consisting of a breathable inner material and a breathable sealing layer. A cross section of a perspective view of an air-permeable package formed by sealing the four peripheral edges with the air-permeable sealing layer 4 on the inside is shown. In the drawings, 1 is a non-breathable outer material, 2 is a sealing layer, 3 is a breathable inner material, 4 is a breathable sealing layer, 5 is an air layer, 6 is a double packaging material,
7 represents a sealed portion of the bag, and 8 represents an enclosed item.

Claims (1)

[Claims] 1 Consists of a non-breathable outer material, a seal layer, a breathable inner material, and a breathable seal layer,
A sealing layer is arranged between a non-breathable outer material and a breathable inner material, and the outer material and the sealing layer are laminated and bonded, and breathability is provided between the sealing layer and the breathable sealing layer. A packaging material in which a breathable inner material and a breathable sealing layer are laminated and bonded, and the sealing layer and the breathable inner material are bonded together at the periphery of the cut portion during packaging. 1. A double packaging material, characterized in that it is laminated and adhesively bonded and allows air to pass through the cut surface of a breathable inner material and a breathable sealing layer.