JP2017094533A - Laminate film, packaging bag, and package - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging bag and a package that can reduce a retort odor and maintain high laminate strength, and a laminate film that can form them.SOLUTION: A laminate film 50 comprises a substrate film 10 having a barrier layer 14, an adhesion layer 20, and a sealant layer 30, in the stated order. The adhesion layer 20 comprises an adhesive component, and zinc oxide particles dispersed in the adhesive component.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a laminated film, a packaging bag, and a packaging body.

  A packaging material used for packaging an object to be packaged is required to have a function of suppressing quality deterioration of the object to be packaged. As a packaging material, a packaging bag configured by bonding a pair of laminated films is known. Such a packaging bag is required to have excellent sealing properties in order to prevent deterioration of the quality of the packaged item.

  An example of the package is food. Among food products, when food containing sulfur-containing amino acids such as meat products and egg products is boiled or retort sterilized, a specific odor may be generated. This odor is caused by sulfur compounds such as hydrogen sulfide generated by hydrolysis of sulfur-containing amino acids. In patent document 1, in order to reduce such a retort odor, providing the layer formed from a polyvalent metal compound in a packaging bag is proposed.

JP 2014-61682 A

  There are a wide variety of packages to be packaged, and the packages contain various components. Among these, a specific component may react with the component which comprises each layer of the laminated | multilayer film which forms a packaging bag, and may affect lamination strength. The layer formed from the polyvalent metal compound of Patent Document 1 is effective in reducing the retort odor. However, depending on the components contained in the package, there is a possibility of affecting the laminate strength between layers of the laminated film.

  Therefore, an object of the present invention, in one aspect, is to provide a packaging bag and a packaging body capable of reducing a retort odor and maintaining a high laminate strength. Another object of the present invention is to provide a laminated film capable of forming the above-described packaging bag and package.

  In one aspect, the present invention is a laminated film including a base film having a barrier layer, an adhesive layer, and a sealant layer in this order. The adhesive layer includes an adhesive component and an adhesive component. And a zinc oxide particle dispersed therein.

  Since the said laminated | multilayer film contains a zinc oxide particle, when it is used for the packaging bag of a package, it can adsorb | suck a sulfur compound etc. and can reduce a retort odor. And since the zinc oxide particle is disperse | distributed in the adhesive agent component, it can suppress that a zinc oxide particle reacts with the component contained in a to-be packaged object, and changes in quality. Therefore, when it is used for a packaging bag of a package, a high laminating strength can be maintained regardless of the type of the packaged object, while reducing the retort odor.

  The content of zinc oxide particles in the adhesive layer is preferably 1 to 10% by mass. By containing the zinc oxide particles with such a content, it is possible to achieve both the laminate strength of the adhesive layer and the action of reducing the retort odor at a high level.

  The adhesive component is preferably a two-component curable adhesive. Thereby, the alteration of the zinc oxide particles can be sufficiently suppressed regardless of the type of the objects to be packaged accommodated in the packaging bag. The average particle diameter of the zinc oxide particles is preferably 0.5 μm or less from the viewpoint of further increasing the laminate strength of the adhesive layer.

  The base film may have a nylon layer. Since the nylon layer has flexibility, it can suppress that a pinhole arises in a packaging bag and a to-be-packaged product deteriorates. Such an action is particularly useful when the package is a food.

  In another aspect, the present invention provides a packaging bag formed by laminating films, wherein the film includes the above-described laminated film. This packaging bag includes a laminated film capable of reducing a retort odor and maintaining a high laminate strength. Therefore, it is possible to stably package the packaged object over a long period of time.

  In still another aspect, the present invention provides a package including the packaging bag and an article to be packaged accommodated therein. This package includes a packaging bag capable of reducing a retort odor and maintaining a high laminate strength. Therefore, the article to be packaged can be stably stored for a long period of time.

  The package of the package may contain a sulfur compound. When a sulfur compound is contained, components that cause a retort odor such as hydrogen sulfide or mercaptan are generated by hydrolysis. Since the packaging bag of the said package is disperse | distributing in the contact bonding layer in the zinc oxide particle which adsorb | sucks the said component, while being able to reduce a retort odor, it can maintain high laminate strength.

  In one aspect, the present invention can provide a packaging bag and a package that can reduce a retort odor and maintain a high laminate strength. In another aspect, the present invention can provide a laminated film capable of forming the above-described packaging bag and package.

FIG. 1 is a cross-sectional view showing an embodiment of a laminated film. FIG. 2 is a cross-sectional view showing another embodiment of the laminated film. FIG. 3 is a front view showing an embodiment of the packaging bag. FIG. 4 is a perspective view showing another embodiment of the packaging bag. FIG. 5 is a perspective view showing still another embodiment of the packaging bag.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings depending on cases. However, the following embodiments are examples for explaining the present invention, and are not intended to limit the present invention to the following contents. In the description, the same reference numerals are used for the same elements or elements having the same function, and redundant description is omitted in some cases. Further, the positional relationship such as up, down, left and right is based on the positional relationship shown in the drawings unless otherwise specified. Further, the dimensional ratios in the drawings are not limited to the illustrated ratios.

  FIG. 1 is a schematic cross-sectional view of the laminated film of the present embodiment. The laminated film 50 includes the base film 10 having the resin layer 12 and the barrier layer 14, and the adhesive layer 20 and the sealant layer 30 in this order on the barrier layer 14 side of the base film 10. That is, the laminated film 50 has a structure in which the resin layer 12, the barrier layer 14, the adhesive layer 20, and the sealant layer 30 are laminated in this order.

  The resin layer 12 is composed of a resin film. Examples of the resin film include polyester films such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN); polyolefin films such as polyethylene and polypropylene; polystyrene films; polyamide films such as 66-nylon; polycarbonate films and polyacrylonitrile films. And engineering plastic films such as polyimide films.

  You may use the said resin film individually by 1 type or in combination of 2 or more types. The resin layer 12 may be configured by stacking a plurality of the same type. The resin film may be either stretched or unstretched. At least one stretched film and at least one unstretched film may be laminated. The resin layer 12 can improve mechanical strength and dimensional stability by having a film arbitrarily stretched in the biaxial direction.

  The above-mentioned resin layer 12 may have a polyester film or a biaxially stretched polypropylene film from the viewpoint of achieving both strength and flexibility. From the viewpoint of the strength and cost of the film itself, it may have a polypropylene film or a polyethylene terephthalate (PET) film, and may have a nylon film from the viewpoint of the strength of the film itself.

  The thickness in particular of the resin layer 12 is not restrict | limited, For example, 3-100 micrometers may be sufficient and 6-50 micrometers may be sufficient. The thickness is appropriately adjusted according to the application or required characteristics. The resin layer 12 may contain at least one additive selected from fillers, antistatic agents, plasticizers, lubricants, antioxidants, and the like. The surface of the resin layer 12 may be subjected to at least one treatment selected from chemical treatment, solvent treatment, corona treatment, plasma treatment, and ozone treatment.

  You may provide a printing layer suitably between the resin layer 12 and the barrier layer 14 as needed. The printing layer is an ink obtained by adding various pigments, plasticizers, desiccants, stabilizers and the like to conventionally used binder resins such as urethane, acrylic, nitrocellulose, or rubber. It is the layer comprised by. Characters, designs, etc. can be displayed by this print layer. As the printing method, for example, known printing methods such as offset printing, gravure printing, flexographic printing, silk screen printing, and ink jet printing can be used. Moreover, the adhesiveness of a printing layer can be improved by performing the corona treatment or the ozone treatment as the pretreatment on the surface of the resin layer 12 in advance.

  The barrier layer 14 is a layer having a barrier property. Examples of the barrier layer 14 include a vapor-deposited film made of an inorganic material, a metal foil, a resin film, and a resin film obtained by laminating a vapor-deposited layer. Specific examples include inorganic vapor deposition films such as silica, aluminum vapor deposition films, aluminum foils, aluminum foil laminated PET films, and various barrier films such as nylon barrier films and ethylene vinyl alcohol barrier films. You may have these 1 type individually or in combination of 2 or more types.

  The thickness of the barrier layer 14 is not particularly limited. When the barrier layer 14 consists of a vapor deposition layer, the thickness is 5-100 nm, for example. When the barrier layer 14 consists of aluminum foil, the thickness is 7-9 micrometers, for example. Thus, the thickness is appropriately adjusted according to the material of the barrier layer 14 and the use of the laminated film. The barrier layer 14 can be formed by, for example, a vacuum deposition method, a sputtering method, an ion plating method, a plasma vapor deposition method (CVD), a dry lamination method, an extrusion lamination method, or the like.

  Since the laminated film 50 includes the barrier layer 14, oxygen, water vapor, and the like can be prevented from entering the packaging bag. Thereby, deterioration of a to-be-packaged item can be suppressed.

  The adhesive layer 20 contains an adhesive component and zinc oxide particles dispersed in the adhesive component. Examples of the adhesive component include known adhesives such as urethane adhesives, polyester adhesives, polyamide adhesives, epoxy adhesives, and isocyanate adhesives. Among these, a two-component curable adhesive is preferable and a two-component curable urethane adhesive is more preferable from the viewpoint of sufficiently suppressing the deterioration of the zinc oxide particles. The reason why such an action is obtained is that zinc oxide particles are hardly brought into contact with an article to be packaged or the like by incorporating zinc oxide particles into the crosslinked structure formed in the molecular structure of the adhesive. Inferred. The effect of this tends to appear more prominently when a two-component curable urethane adhesive is used.

  Usable commercially available zinc oxide particles can be used. The average particle diameter of the zinc oxide particles is preferably 0.5 μm or less from the viewpoint of further increasing the laminate strength of the adhesive layer 20, and from the viewpoint of sufficiently increasing the laminate strength and odor reducing action, More preferably, it is 0.3 μm. In addition, the average particle diameter in this specification is a volume average particle diameter measured using a commercially available laser diffraction type particle size distribution meter.

  The content of zinc oxide particles in the adhesive layer 20 is preferably 1 to 10% by mass from the viewpoint of achieving both the laminate strength of the adhesive layer 20 and the action of reducing the retort odor at a high level, and 1.5 to 5%. More preferably, it is mass%.

For example, the lower limit of the specific surface area of the zinc oxide particles may be 1 m ² / g or 5 m ² / g. The upper limit of the specific surface area of the zinc oxide particles may be, for example, 100 m ² / g or 50 m ² / g. Zinc oxide particles having such a specific surface area can achieve both handling ease and reduction of retort odor at a high level.

  The adhesive layer 20 is formed by blending and mixing the above-described adhesive component and zinc oxide particles, applying the mixture onto the barrier layer 14, and then curing. Thereby, the adhesive layer 20 in which zinc oxide particles are dispersed in the adhesive component is formed.

  The laminate strength of the adhesive layer 20 is, for example, 10 N / 15 mm width or more, preferably 12 N / 15 mm width or more. This laminate strength can be measured by a T-type peeling method (crosshead speed: 300 mm / min) using a Tensilon type tensile tester in accordance with JIS Z 0238: 1998.

  The thickness of the adhesive layer 20 is preferably 0.01 to 5 μm from the viewpoint of suppressing the laminated film 50 from becoming too thick while maintaining sufficient laminating strength and retort odor suppression. More preferably, it is 3 μm.

  Examples of the sealant layer 30 include low density polyethylene, medium density polyethylene, high density polyethylene, linear (linear) low density polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ionomer resin, and ethylene-acrylic acid copolymer. Examples thereof include those composed of a resin such as a polymer, an ethylene-methyl acrylate copolymer, an ethylene-methacrylic acid copolymer, and an ethylene-propylene copolymer, which can be melted by heat and fused to each other. Any one of these may be used alone or in combination of two or more.

  The sealant layer 30 may be laminated on the adhesive layer 20 while forming the resin composition by extrusion lamination, or a filmed sheet may be bonded to the adhesive layer 20. The thickness of the sealant layer 30 may be, for example, 10 to 150 μm, or 30 to 80 μm. When used as a package for boil sterilization or retort sterilization, the sealant layer 30 is preferably made of an unstretched polypropylene resin from the viewpoint of maintaining sufficient adhesion.

  The laminated film 50 may include one or a plurality of intermediate layers between the above-described layers.

  FIG. 2 is a cross-sectional view showing another embodiment of the laminated film. The laminated film 60 includes the adhesive layer 16 and the intermediate layer 18 in this order from the barrier layer 14 side between the adhesive layer 20 and the barrier layer 14, and the adhesive layer 13 between the barrier layer 14 and the resin layer 12. Is provided. The intermediate layer 18 is bonded to the barrier layer 14 via the adhesive layer 16. That is, the laminated film 60 is different from the laminated film 50 in that the laminated film 60 includes a base film 10 </ b> A including a resin layer 12, an adhesive layer 13, a barrier layer 14, an adhesive layer 16, and an intermediate layer 18 instead of the base film 10. doing. Other configurations of the laminated film 60 are the same as those of the laminated film 50.

  Examples of the intermediate layer 18 include films of nylon, polyethylene terephthalate, polyamide, polyethylene, polypropylene, polyvinyl chloride, polycarbonate, polyvinyl alcohol, ethylene-propylene copolymer, saponified ethylene-vinyl acetate copolymer, and the like. . The kind of film which comprises the intermediate | middle layer 18 can be selected according to the use of a laminated film. Thereby, for example, oxygen barrier property, water vapor barrier property, mechanical strength, bending resistance, puncture resistance, impact resistance, wear resistance, cold resistance, heat resistance, chemical resistance, or light resistance It becomes possible to improve. For example, by using nylon as the intermediate layer 18, the flexibility is improved, and even when a large external force is applied, the generation of pinholes can be sufficiently suppressed.

  The adhesive layer 13 and the adhesive layer 16 are the same as the adhesive component of the adhesive layer 20, that is, known adhesives such as urethane adhesives, polyester adhesives, polyamide adhesives, epoxy adhesives, and isocyanate adhesives. You may form using the adhesive agent of. The adhesive layer 13 and the adhesive layer 16 may not contain zinc oxide particles, and may contain the same as the adhesive layer 20. The adhesive layer 13 and the adhesive layer 16 may be formed using the same type of adhesive, or may be formed using different types of adhesive.

  FIG. 3 is a plan view showing an embodiment of a packaging bag formed using a laminated film. The packaging bag 100 includes a seal portion 101 formed by bonding the peripheral edges of a pair of substantially rectangular laminated films 50 (60), and a housing portion 102 formed between the pair of laminated films 50 (60) by the seal portion 101. Is provided. That is, the packaging bag 100 is sealed by the seal portion 101 at the side end, the lower end, and the upper end. The packaging bag 100 includes an accommodating portion 102 in which an article to be packaged such as food is accommodated in a non-sealed portion (sheet portion) surrounded by the seal portion 101. The accommodation unit 102 accommodates an object to be packaged such as food. In addition, you may seal the sealing part 101 of a lower end part, after filling the to-be-packaged item in the accommodating part 102. FIG.

  The pair of laminated films 50 (60) are overlaid so that the sealant layers 30 face each other. The pair of laminated films 50 (60) may be bonded to each other at the seal portion 101 with an adhesive.

  The laminated film 50 (60) constituting the packaging bag 100 includes the adhesive layer 20 containing zinc oxide particles dispersed in the adhesive component on the inner side (the packaged object side) than the barrier layer 14. Since the zinc oxide particles are dispersed in the adhesive component, deterioration due to the components contained in the package (for example, an acid such as acetic acid) is suppressed. As a result, the zinc oxide particles can adsorb a causative substance of a retort odor such as a sulfur compound generated from an object to be packaged over a long period of time. For this reason, when a packaged object 200 such as a food product is accommodated in the accommodating portion 102 of the packaging bag 100, accumulation of the causative substance in the accommodating portion 102 can be suppressed. Therefore, the retort odor generated when the package 200 is opened can be reduced.

  It is not essential that the pair of laminated films 50 (60) constituting the packaging bag 100 have the same layer configuration, and one may be the laminated film 50 and the other may be the laminated film 60. Moreover, you may provide a printing layer only in one laminated film 50 (60) or on the surface of both laminated films 50 (60).

  The packaging bag 100 may include an opening means 120. The unsealing means has a pair of easy-opening process parts 124 made of a group of scars formed on the seal part 101 at the side end part, and a half-cut line 121 serving as an opening orbit between the pair of easy-opening process parts 124. The half cut line 121 can be formed using a laser. The easy-open processing part 124 is not limited to the scar group, and may be a V-shaped, U-shaped or I-shaped notch.

  The procedure for manufacturing the packaging bag 100 and the packaging body 200 using the laminated film 50 (60) will be described below. A pair of laminated films 50 (60) is prepared. The sealant layers 30 of the laminated film 50 (60) are opposed to each other, and the sealant layers are bonded to each other. As a result, the seal portion 101 is formed at the upper end portion and the side end portion, and a non-seal portion surrounded by a U-shape by the seal portion 101 is formed. In this way, a packaging bag 110 in which only the upper end portion (or only the lower end portion) is not sealed as shown in FIG. 4 is obtained. In some embodiments, the packaging bag may be partially unsealed as shown in FIG.

  Next, an article to be packaged is filled from the upper end (or the lower end) in an unsealed state. Thereafter, the laminated films 50 (60) are bonded to each other at the upper end (or lower end), and the seal portion 101 is also formed at the upper end (or lower end). Thus, the package 200 provided with the packaging bag 100 and the to-be-packaged goods accommodated in it can be manufactured.

  FIG. 5 is a perspective view showing another embodiment of the packaging bag (packaging body). The packaging bag 150 has a pair of laminated films 50 (60) and a bottom tape 152 on the lower end side of the laminated films 50 (60), thereby exhibiting a standing pouch shape. The bottom tape 152 is composed of a laminated film having the same layer structure as that of the laminated film 50 (60). The package 210 includes a packaging bag 150 and an article to be packaged accommodated therein.

  The laminated film 50 (60) constituting the packaging bag 150 includes an adhesive layer 20 containing zinc oxide particles dispersed in an adhesive component on the inner side (packaged object side) than the barrier layer 14. Since the zinc oxide particles are dispersed in the adhesive component, deterioration due to the components contained in the package (for example, an acid such as acetic acid) is suppressed. As a result, the zinc oxide particles can adsorb a causative substance of a retort odor such as a sulfur compound generated from an object to be packaged over a long period of time. For this reason, when packaging objects, such as foodstuffs, are accommodated in the accommodation part of the packaging bag 150 and used as the package 210, accumulation of the causative substance in the accommodation part can be suppressed. Therefore, the retort odor generated when the package 210 is opened can be reduced.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment. For example, the laminated film may include any layer or thin film between the adhesive layer 20 and the sealant layer 30 or between the resin layer 12 and the barrier layer 14 as long as the function of the laminated film is not significantly impaired. Good. The shape of the packaging bag is not limited to a four-sided bag and a standing pouch-shaped packaging bag. For example, a two-sided bag, a three-sided bag, or a jointed bag may be used. The packaging bag may be provided with a fastener made of a synthetic resin that can be repeatedly sealed by fitting a plug or a band-shaped protrusion and a band-shaped groove.

  The contents of the present invention will be described in more detail with reference to examples and comparative examples, but the present invention is not limited to the following examples.

Example 1
Polyurethane adhesive (trade name: A620 / A65, manufactured by Mitsui Chemicals, Inc.) on a biaxially stretched polyethylene terephthalate film (Toyobo Ester film, trade name: E5100, thickness: 12 μm) using a dry lamination machine Then, an aluminum foil (made by Toyo Aluminum Co., Ltd.) having a thickness of 7 μm to be a barrier layer was bonded.

  On the aluminum foil, a polyurethane adhesive (trade name: A620 / A65, manufactured by Mitsui Chemicals, Inc.) is applied using a dry lamination machine, and a nylon film (NY, manufactured by Unitika, trade name: emblem, thickness) S: 15 μm) was laminated.

  The above-mentioned polyurethane adhesive and zinc oxide particles were blended and mixed to obtain a paste-like mixture. At this time, the blending ratio (mass basis) of the zinc oxide particles with respect to the total of the polyurethane adhesive and the zinc oxide particles was 1.5% by mass.

  On the nylon film, the above mixture was applied as an adhesive using a dry lamination machine, and bonded to a polyolefin-based unstretched coextruded film having a thickness of 80 μm as a sealant layer to produce a laminate. Thus, a laminated film having a laminated structure as shown in FIG. 2 was obtained. That is, this laminated film includes a polyolefin-based unstretched coextruded film (sealant layer), an adhesive layer (including zinc oxide particles), an intermediate layer (nylon layer), an adhesive layer (not including zinc oxide particles), a barrier layer, It had an adhesive layer (not including zinc oxide particles) and a resin layer in this order.

  The obtained pair of laminated films were bonded together so that the sealant layers were opposed to each other, thereby producing a packaging bag (three-sided bag) as shown in FIG. And the cystine aqueous solution which contains 0.03 mass% of cysteine was accommodated in the packaging bag, sealed, and the retort process which heats at 120 degreeC for 60 minute (s) was performed. After the retort treatment, the gas in the packaging bag was collected, and the hydrogen sulfide concentration was determined by the methylene blue method (wavelength: 668 nm). In calculating the hydrogen sulfide concentration, a calibration curve prepared in advance was used. Table 1 shows the measurement results of the hydrogen sulfide concentration.

  Next, a packaging bag prepared separately using the above laminated film was aged at 45 ° C. for 4 days, and then the laminate strength between the nylon layer and the sealant layer was measured. Specifically, in accordance with JIS Z 0238: 1998, a T-type peeling method (crosshead speed: 300 mm) using a tensile testing machine (manufactured by A & D Co., Ltd., trade name: Tensilon Universal Material Testing Machine). / Min), the laminate strength was measured. The measurement results are shown in Table 1 as the laminate strength before use.

  Next, the vinegar was put into the packaging bag which has the same structure, and the retort process which heats at 120 degreeC for 60 minutes was performed. Before and after the retort treatment, the laminate strength between the nylon layer and the sealant layer of the laminated film constituting the packaging bag was measured. The measurement method was the same as the laminate strength before use. The measurement results are shown in Table 1 as the laminate strength after use.

(Examples 2 and 3)
When preparing the paste-like mixture used for forming the adhesive layer containing zinc oxide particles, the mixture ratio of the polyurethane adhesive and zinc oxide particles was changed as shown in Table 1, and the same as in Example 1 Thus, a laminated film and a packaging bag were produced. Then, evaluation was performed in the same manner as in Example 1. The evaluation results are shown in Table 1.

(Comparative Example 1)
A laminated film and a packaging bag were produced in the same manner as in Example 1 except that the adhesive layer was formed using only the polyurethane-based adhesive without using the zinc oxide particles. Then, evaluation was performed in the same manner as in Example 1. The evaluation results are shown in Table 1.

(Comparative Example 2)
A laminated film and a packaging bag were produced in the same manner as in Comparative Example 1 except that the following first layer and second layer were formed between the nylon layer and the sealant layer. The compositions of the first coating liquid for forming the first layer and the second coating liquid for forming the second layer were as follows.

<First coating solution>
20 g of a number average molecular weight 200,000 polyacrylamide (PAA) aqueous solution (manufactured by Toa Gosei Co., Ltd., trade name: Aron A-10H, solid content concentration: 25 mass%) was dissolved in 58.9 g of distilled water. To this solution, 0.44 g of aminopropyltrimethoxysilane (APTMS: Sigma-Aldrich Japan) was added to prepare a first coating solution.
<Second coating solution>
A dispersion of zinc oxide particles (manufactured by Sumitomo Osaka Cement Co., Ltd., trade name: ZS303, average particle size 0.02 μm, solid content concentration: 30 mass%, dispersion toluene) was used as the second coating liquid.

  On the nylon layer, the first coating solution was applied using a bar coater so that the thickness after drying was 1 μm, and then dried at 80 ° C. for 5 minutes. Thereafter, an aging treatment for 3 days at 50 ° C. and a heat treatment for 5 minutes at 200 ° C. were performed to form a first layer. Next, the second coating liquid is applied on the first layer by using a bar coater so that the thickness after drying becomes 1 μm, and then a heat treatment is performed by heating at 90 ° C. for 2 minutes. A layer was formed.

  On the second layer, an unstretched polypropylene film (CPP, manufactured by Toray Film Processing Co., Ltd., trade name: “Trephan” NO ZK93KM, thickness: 60 μm) and an adhesive (A620 / A65 manufactured by Mitsui Chemicals, Inc.) ) Was laminated by a dry laminating method. Thereby, a laminated film of Comparative Example 2 was obtained. Then, evaluation was performed in the same manner as in Example 1. The evaluation results are shown in Table 1.

As shown in Table 1, in Examples 1 to 3, H ₂ S generated in the retort treatment was adsorbed by the zinc oxide particles dispersed in the adhesive layer, so that the H ₂ S concentration in the gas was sufficiently reduced. I was able to. Moreover, the laminate strength between the nylon layer and the sealant layer of the laminated film could be maintained sufficiently high even after retorting (after use).

On the other hand, in Comparative Example 1 was used a laminated film having an adhesive layer containing no zinc oxide particles, the H _{2 S} concentration in the gas was higher than Examples 1-3. In Comparative Example 2 coated with zinc oxide particles, the laminate strength after use was low. This is presumed to be because the zinc oxide particles of Comparative Example 2 were altered by vinegar as the contents (packaged contents). The amount of ZnO of Comparative Example 2, despite a 1.5-fold in Example 1, H _{2 S} concentration in the gas Comparative Example 2 was the same as in Example 1. In each example, the zinc oxide particles were dispersed in the adhesive component, whereas in Comparative Example 2, the zinc oxide particles were not dispersed in the adhesive component, so that the zinc oxide particles were corroded. This is probably because the adsorption function of the H ₂ S concentration was impaired.

  According to the present disclosure, a packaging bag and a packaging body capable of reducing a retort odor and maintaining a high laminate strength are provided. Moreover, the laminated | multilayer film which can form such a packaging bag and a package are provided.

  DESCRIPTION OF SYMBOLS 10,10A ... Base film, 12 ... Resin layer, 13 ... Adhesive layer, 14 ... Barrier layer, 16 ... Adhesive layer, 18 ... Intermediate layer, 20 ... Adhesive layer, 30 ... Sealant layer, 50, 60 ... Laminated film, DESCRIPTION OF SYMBOLS 100,110,150 ... Packaging bag, 101 ... Sealing part, 102 ... Storage part, 120 ... Opening means, 121 ... Half-cut line, 124 ... Easy opening processing part, 152 ... Bottom tape, 200, 210 ... Packaging.

Claims (8)

A laminated film comprising a base film having a barrier layer, an adhesive layer, and a sealant layer in this order,
The adhesive layer is a laminated film containing an adhesive component and zinc oxide particles dispersed in the adhesive component.   The laminated film according to claim 1, wherein the content of the zinc oxide particles in the adhesive layer is 1 to 10% by mass.   The laminated film according to claim 1 or 2, wherein the adhesive component is a two-component curable adhesive.   The laminated film according to any one of claims 1 to 3, wherein an average particle diameter of the zinc oxide particles is 0.5 µm or less.   The said base film is a laminated film as described in any one of Claims 1-4 which has a nylon layer. A packaging bag made by laminating films,
The packaging bag provided with the laminated | multilayer film as described in any one of Claims 1-5.   A package comprising the packaging bag according to claim 6 and an article to be packaged accommodated in the packaging bag. The package according to claim 7, wherein the package includes a sulfur compound.

Images