JP2016097976A - Package film and package - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a package film that has excellent carbon dioxide adsorptivity, and can maintain an original odor of contents.SOLUTION: A package film comprises a barrier material 20, and a sealant material 30 provided on one face of the barrier material 20. The sealant material 30 comprises a zeolite-containing layer 34 comprising hydrophilic zeolite and hydrophobic zeolite. The hydrophilic zeolite is zeolite having Na ions and/or zeolite having Ca ions. In the zeolite-containing layer, a mass ratio expressed by hydrophilic zeolite/hydrophobic zeolite is 5/5-9/1.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a film for a package and a package.

In recent years, opportunities to drink coffee and tea in daily life such as after meals and between meals have increased.
Coffee and tea are favored by many people not only for their taste but also for their aroma (odor). In particular, a coffee-specific odor is strongly felt from the coffee beans immediately after roasting and the ground product obtained by grinding the coffee beans.

When coffee beans are roasted, carbon dioxide gas is generated along with the odor peculiar to coffee as described above (original odor of coffee). Therefore, when the coffee beans immediately after roasting or the pulverized body thereof are filled and stored in the package, there is a problem that the package is expanded by carbon dioxide gas or ruptured during storage.
With respect to such a problem, Patent Document 1 and Patent Document 2 disclose a package including a gas vent valve.
However, if the roasted coffee beans are filled in the package of Patent Document 1 and Patent Document 2, when carbon dioxide gas is discharged from the gas vent valve, the original odor of coffee is also discharged together with the carbon dioxide gas. was there.

JP-A-8-258873 JP-A-10-1181

  An object of the present invention is to provide a film for a packaging body that is excellent in carbon dioxide adsorption and can maintain the original odor of the contents.

As a result of intensive studies, the present inventors have found that the following packaging film can solve the above problems.
That is, the film for packaging bodies of this invention has the following structures.
[1] A barrier material and a sealant material provided on one surface of the barrier material, wherein the sealant material includes a zeolite-containing layer containing a hydrophilic zeolite and a hydrophobic zeolite, , A zeolite having Na ions and / or a zeolite having Ca ions, wherein the mass ratio represented by hydrophilic zeolite / hydrophobic zeolite in the zeolite-containing layer is 5/5 to 9/1 A film for packaging.
[2] The film for packaging according to [1], wherein the sealant material is provided with a laminate layer, the zeolite-containing layer, and a heat seal layer in order from the barrier material side.
[3] The packaging film according to [1] or [2], which is used for packaging roasted coffee beans or a pulverized body thereof.
[4] A package comprising the packaging film according to any one of [1] to [3].

  The film for a package of the present invention is excellent in carbon dioxide gas adsorption and can maintain the original odor of the contents.

It is sectional drawing of the film for packaging bodies concerning 1st embodiment of this invention. It is sectional drawing of the film for packaging bodies concerning 2nd embodiment of this invention.

The film for a packaging body of the present invention includes a barrier material and a sealant material provided on one surface of the barrier material, and the sealant material contains a hydrophilic zeolite and a hydrophobic zeolite.
Hereinafter, the film for packaging body of the present invention will be described with reference to embodiments.

(First embodiment)
The film for packaging bodies according to the first embodiment of the present invention will be described with reference to the drawings. The packaging film 1 in FIG. 1 is obtained by laminating a base material 10, a barrier material 20, and a sealant material 30 in this order. That is, the packaging film 1 includes a barrier material 20 and a sealant material 30 provided on one surface of the barrier material 20.
Although the thickness of the film 1 for packaging bodies is not specifically limited, For example, 40-250 micrometers is preferable, 50-200 micrometers is more preferable, 60-150 micrometers is further more preferable. If it is less than the said lower limit, there exists a possibility that the intensity | strength of the film 1 for packaging bodies may fall, and when it exceeds the said upper limit, the softness | flexibility of the film 1 for packaging bodies may fall and handling may become complicated.

<Base material>
As for the base material 10, resin-made films, paper, these laminated bodies, etc. are mentioned.
Resin films include polyolefins such as polyethylene terephthalate (PET) such as biaxially stretched polyethylene terephthalate, biaxially stretched polypropylene (OPP), unstretched polypropylene (CPP), high density polyethylene (HDPE), and medium density polyethylene (MDPE). And polyamide (PA) such as biaxially stretched nylon, and laminates thereof. Among these, PET, polypropylene (PP), and PA are preferable, and biaxially stretched PET, OPP, and PA are more preferable.
As a laminated body, the laminated body of the said resin films is mentioned.
The base material 10 may be printed on the surface or between the layers.

  The thickness of the base material 10 is determined in consideration of a material, a structure, etc., for example, 5-100 micrometers is preferable and 10-50 micrometers is more preferable. If it is less than the said lower limit, the intensity | strength of the film 1 for packaging bodies may fall, and when it exceeds the said upper limit, the softness | flexibility of the film 1 for packaging bodies may be impaired and handling may become complicated.

<Barrier material>
The barrier material 20 has a role of suppressing the transmission of odors in the contents. Examples of the barrier material 20 include metal foils such as aluminum foil and copper foil, biaxially stretched PET, ethylene-vinyl alcohol polymer (EVOH), polyvinylidene chloride (PVDC), polyvinyl alcohol (PVOH), polyacrylonitrile (PAN), and the like. A resin film conventionally used as a barrier material, a vapor-deposited film in which a metal such as aluminum or silica is vapor-deposited on the resin film, and a laminate thereof are exemplified. As the barrier material 20, an aluminum (Al) foil, EVOH, or an Al vapor deposition film is preferable.

The gas permeability of the barrier material 20 is preferably 5 cm ³ / (m ² · atm · 24 h) [= 4.93 cm ³ / (m ² · MPa · 24 h)] or less, preferably 1 cm ³ / (m ² · atm · 24 h. ) [= 0.987 cm ³ / (m ² · MPa · 24 h)] or less. If it is below the said upper limit, the odor of a content will become more difficult to lose. The gas permeability is determined by the kon K 7126 mocon method.

The thickness of the barrier material 20 is determined in consideration of the material and configuration. When using metal foil as the barrier material 20, the thickness of the barrier material 20 is preferably 6 to 20 μm, and more preferably 7 to 12 μm, for example. If it is less than the said lower limit, there exists a possibility that gas-barrier property may fall, and when it exceeds the said upper limit, the softness | flexibility of the film 1 for packaging bodies may be impaired, and there exists a possibility that handling may become complicated.
When a resin film is used as the barrier material 20, the thickness of the barrier material 20 is preferably, for example, 10 to 30 μm, and more preferably 12 to 15 μm. If it is less than the said lower limit, there exists a possibility that gas-barrier property may fall, and when it exceeds the said upper limit, the softness | flexibility of the film 1 for packaging bodies may be impaired, and there exists a possibility that handling may become complicated.

<Sealant material>
The sealant material 30 is a laminate in which a laminate layer 32, a zeolite-containing layer 34, and a heat seal layer 36 are arranged in order from the barrier material 20 side.

≪Laminate layer≫
The laminate layer 32 mainly has a role of improving the adhesion between the sealant material 30 and the barrier material 20.
Examples of the resin constituting the laminate layer 32 include polyolefins such as low density polyethylene (LDPE), linear LDPE (LLDPE), MDPE, HDPE, PP, EVOH, ethylene-vinyl acetate copolymer (EVA), ethylene- Examples thereof include acrylic acid copolymer (EAA), ethylene-methacrylic acid copolymer (EMAA), ethylene-ethyl acrylate copolymer (EEA), and ionomer. These resins may be used alone or in combination of two or more.

  5-50 micrometers is preferable and, as for the thickness of the laminate layer 32, 10-20 micrometers is more preferable. If it is less than the said lower limit, there exists a possibility that the adhesive strength of the sealant material 30 with respect to the barrier material 20 may fall, and when it exceeds the said upper limit, the film 1 for packaging bodies may become too thick, and there exists a possibility that a softness | flexibility may be impaired.

≪Zeolite-containing layer≫
The zeolite-containing layer 34 is a resin film containing zeolite and adsorbs carbon dioxide gas generated from the contents.
Examples of the resin constituting the zeolite-containing layer 34 include the same resins as those constituting the laminate layer 32.

The zeolite contained in the zeolite-containing layer 34 is a hydrophilic zeolite and a hydrophobic zeolite, and the hydrophilic zeolite is a zeolite having Na ions and / or a zeolite having Ca ions, and the hydrophilicity in the zeolite-containing layer. The mass ratio of the zeolite and the hydrophobic zeolite is 5/5 to 9/1 in terms of a mass ratio represented by hydrophilic zeolite / hydrophobic zeolite.
The zeolite-containing layer 34 can selectively adsorb carbon dioxide gas by containing a hydrophilic zeolite having Na ions and / or a hydrophilic zeolite having Ca ions and a hydrophobic zeolite in a predetermined mass ratio. Therefore, the carbon dioxide gas generated from the contents can be selectively adsorbed and the original odor of the contents can be maintained well.

The hydrophilic zeolite has a molar ratio represented by SiO ₂ / Al ₂ O ₃ (hereinafter, sometimes referred to as SiO ₂ / Al ₂ O ₃ ratio) of less than 5. _SiO 2 / _Al 2 _{O 3} ratio of hydrophilic zeolite is preferably from 1 to 4.9, 1 to 3 is more preferable. The lower limit is the lowest theoretical SiO ₂ / Al ₂ O ₃ ratio in zeolite. If it is below the said upper limit, the adsorptivity of a carbon dioxide gas will increase more easily.

The hydrophilic zeolite is a zeolite having Na ions (Na-type zeolite) and / or a zeolite having Ca ions (Ca-type zeolite). In the present invention, carbon dioxide adsorption is enhanced by using zeolite having Na ions and / or zeolite having Ca ions as the hydrophilic zeolite.
Zeolite has a structure in which a part of Si in SiO ₂ is substituted with Al, and the positive charge is insufficient. Zeolite has cations that can be displaced to compensate for this positive charge. As the cation, one having Na ions is Na-type zeolite, one having Ca ions is Ca-type zeolite, and one having K ions is K-type zeolite.
These Na-type, Ca-type, and K-type zeolites can be obtained, for example, by introducing zeolite into an aqueous solution containing these metal ions and performing ion exchange. These Na-type, Ca-type, and K-type zeolites are commercially available under trade names such as molecular sieves and can be easily obtained from the market.
In the present invention, among these Na-type, Ca-type, and K-type zeolites, the adsorption of carbon dioxide gas is enhanced by using Na-type zeolite and / or Ca-type zeolite as the hydrophilic zeolite.

The amount of crystal water in the hydrophilic zeolite (crystal water amount) is preferably 100 mol or more, more preferably 150 mol or more per mol of the hydrophilic zeolite. If it is more than the said lower limit, the adsorptivity of a carbon dioxide gas will become high easily.
Examples of the hydrophilic zeolite include molecular sieve (trade name, manufactured by Union Showa Co., Ltd.), zeolum (trade name, manufactured by Tosoh Corporation), and the like.

Although the average particle diameter of hydrophilic zeolite is not specifically limited, For example, 5-50 micrometers is preferable, 5-30 micrometers is more preferable, 5-20 micrometers is more preferable, 10-20 micrometers is especially preferable. If it is less than the above lower limit, when the zeolite-containing layer 34 is provided, the hydrophilic zeolite is likely to be secondary agglomerated to easily increase the particle diameter, and the secondary agglomerated particles break the zeolite-containing layer 34 and the zeolite-containing layer 34 There exists a possibility that the effect which provided 34 may fall. If the above upper limit is exceeded, the particle diameter of the hydrophilic zeolite is too large, and the hydrophilic zeolite may damage the zeolite-containing layer 34, so that the effect of providing the zeolite-containing layer 34 may be reduced.
The average particle diameter of the hydrophilic zeolite is a volume standard median diameter measured by a laser diffraction method.

The hydrophobic zeolite has a molar ratio represented by SiO ₂ / Al ₂ O ₃ of 5 or more. The SiO ₂ / Al ₂ O ₃ ratio of the hydrophobic zeolite is preferably 8 or more, more preferably 40 or more, and still more preferably 80 or more. When a hydrophobic zeolite having the lower limit value or more is used in combination with hydrophilic zeolite, the selective adsorption property of carbon dioxide gas is further increased, and the original odor of the contents can be easily maintained.
Hydrophilic _SiO 2 / _Al 2 _{O 3} ratio of the zeolite and a hydrophobic _SiO 2 / _Al 2 _{O 3} ratio of the zeolite and is different is preferably 5 or more, different and more preferably 40 or more. If it is more than the said lower limit, it will become easy to improve the selective adsorption property of a carbon dioxide gas, and it will become easy to maintain the original odor of the contents.

Although the cation which hydrophobic zeolite has is not specifically limited, Na ion, K ion, Ca ion, Mg ion etc. are mentioned.
The amount of crystallization water in the hydrophobic zeolite (the amount of crystallization water) is preferably 50 mol or less, more preferably 30 mol or less, per mol of hydrophilic zeolite.
Examples of the hydrophobic zeolite include hydrophobic molecular sieve (trade name, manufactured by Union Showa Co., Ltd.), high silica zeolite (trade name, manufactured by Tosoh Corporation), and the like.

  The average particle size of the hydrophobic zeolite is the same as the average particle size of the hydrophilic zeolite.

  In the zeolite-containing layer 34, the total amount (zeolite content) of the hydrophilic zeolite and the hydrophobic zeolite is preferably 10 to 70% by mass, and more preferably 25 to 50% by mass. If the total zeolite content is not less than the above lower limit value, it becomes easier to enhance the carbon dioxide adsorption. If the total zeolite content is not more than the above upper limit value, the zeolite-containing layer can be easily formed without defects.

  The mass ratio represented by hydrophilic zeolite / hydrophobic zeolite (hereinafter sometimes referred to as “hydrophilic / hydrophobic ratio”) is 5/5 to 9/1, more preferably 5/5 to 8/2. 5/5 to 7/3 is more preferable. When the hydrophilic / hydrophobic ratio is within the above range, the selective adsorption of carbon dioxide gas is enhanced, and the original odor of the contents can be easily maintained.

  10-100 micrometers is preferable, as for the thickness of the zeolite content layer 34, 20-80 micrometers is more preferable, and 40-60 micrometers is further more preferable. When the amount is within the above preferable range, the carbon dioxide gas adsorbability is easily increased.

≪Heat seal layer≫
Examples of the heat seal layer 36 include conventionally known materials. For example, the same material as the laminate layer 32 may be used. The heat seal layer 36 may have a single layer structure or a multilayer structure.
For example, the heat seal layer 36 may have an easy peel property. The heat seal layer 36 having an easy peel property may be any peeling type such as a cohesive peeling type for phase separation and an interface peeling type for peeling at the interface with the adherend.

  The thickness of the heat seal layer 36 is determined in consideration of the material and the like. For example, the thickness is preferably 5 to 130 μm, more preferably 5 to 90 μm, further preferably 10 to 60 μm, particularly preferably 10 to 50 μm, and 20 to 50 μm. Is most preferred. If it is less than said preferable lower limit, there exists a possibility that heat seal intensity | strength may fall. If the above preferable upper limit value is exceeded, the carbon dioxide gas adsorbability may be lowered.

<Method for producing film for packaging>
The packaging film 1 is manufactured according to a conventionally known manufacturing method.
An example of the manufacturing method of the film 1 for packaging bodies is demonstrated below.
The manufacturing method of the film 1 for packaging bodies of this embodiment is the process (base material manufacturing process) of obtaining the base material 10, the process of obtaining the sealant material 30 (sealant material manufacturing process), the base material 10, and the barrier material 20. A step of laminating the sealant material 30 (lamination step).

  The method of obtaining the base material 10 in the base material manufacturing process is selected from conventionally known methods such as an inflation method, a T-die method, and a co-extrusion method according to the material and configuration of the base material 10.

The method of obtaining the sealant material 30 in the sealant material manufacturing process is selected from conventionally known methods according to the material and configuration of the sealant material 30.
As a method for obtaining the sealant material 30, for example, a sealant that is a laminate of a laminate layer 32, a zeolite-containing layer 34, and a heat seal layer 36 by a coextrusion method using a T-die coextrusion machine, an inflation coextrusion machine, or the like. The method of obtaining the material 30 is mentioned.

  As a method of laminating the base material 10, the barrier material 20, and the sealant material 30 in the laminating step, for example, a method of stacking the base material 10, the barrier material 20, and the sealant material 30 and heating them while pressing them may be mentioned. . At this time, an adhesive may be applied between the materials.

<Packaging body>
The packaging body of this embodiment uses the packaging body film 1 of this embodiment. Examples of the package include bags formed by heat-sealing the heat seal layers 36 of the film 1 for a package. Examples of the form of the package include a palm-attached bag, a three-side seal bag, a four-side seal bag, a gusset bag, a stand bag, and a bag with these chucks.
Further, for example, the packaging body includes a container body having an opening and a lid made of the packaging body film 1, and a heat seal layer 36 is brought into contact with the periphery of the opening of the container body, whereby the packaging body film 1. The container which heat-sealed to the container main body is mentioned. The material of the container body in this case is not particularly limited, and examples thereof include PET, metal, paper, and the like.

According to the packaging film of the present embodiment, a carbon dioxide gas is selected because it includes a zeolite-containing layer containing a hydrophilic zeolite containing Na ions and / or Ca ions and a hydrophobic zeolite in a predetermined mass ratio. Can be adsorbed and the original odor of the contents can be maintained.
For this reason, the packaging film of this embodiment is suitable for packaging beverages, foods, etc. that generate carbon dioxide gas during storage, such as coffee (coffee beans), tea (tea leaves) such as green tea and black tea, and miso. is there. In particular, it is suitable for packaging roasted coffee beans or a pulverized product thereof from the viewpoint of excellent selective adsorption of carbon dioxide gas and maintaining the original odor of the contents.
Furthermore, according to the package formed from the packaging film of the present invention, even when the beverage or food is packaged and stored, the carbon dioxide gas generated during storage is stored in the packaging film. As a result, it is possible to suppress deformation and rupture of the package due to carbon dioxide gas. Furthermore, since the original odor of the beverage or food being stored is maintained, the original odor of the beverage or food is sufficiently felt when the package is opened after storage.
In addition, the package formed from the film for packaging of the present invention does not need to be equipped with a gas vent valve, so it can be manufactured at a low cost with excellent productivity, and the gas vent valve can be used on a shelf in storage. Therefore, it is possible to omit the extra space and the extra space generated when the package is deformed, and the storage property is excellent.

(Second embodiment)
The packaging film according to the second embodiment of the present invention will be described with reference to the drawings. The packaging film 100 of FIG. 2 is obtained by laminating a barrier material 120 and a sealant material 30 in this order. That is, the packaging film 100 includes a barrier material 120 and a sealant material 30 provided on one surface of the barrier material 120.
In this embodiment, the difference from the first embodiment is that the barrier material 120 also serves as a base material.

  The barrier material 120 is a material that doubles as the base material 10 and the barrier material 20 in the first embodiment. Examples of the barrier material 120 include PET, OPP, CPP, HDPE, MDPE, and the like, a vapor deposition film in which a metal such as aluminum or silica is vapor-deposited on the same resin film as the base material 10 in the first embodiment. Especially, as the barrier material 120, a metal vapor deposition film is preferable and an aluminum vapor deposition film is preferable. If it is a metal vapor deposition film, the odor of the contents will be more difficult to lose.

The thickness of the barrier material 120 is the same as the thickness of the base material 10 in the first embodiment.
As a method for producing the packaging film 100, a conventionally known production method can be employed. For example, the vapor deposition film is obtained as the barrier material 120, and the barrier material 120 and the sealant material 30 are overlapped so that the vapor deposition surface of the barrier material 120 and the laminate layer 32 come into contact with each other, and heated while pressing the barrier material 120. .

  According to this embodiment, since the film for packaging bodies can be thinned, the further improvement of a softness | flexibility can be aimed at.

(Other embodiments)
In the above-described embodiment, the sealant material includes the laminate layer. However, the present invention is not limited to this, and the laminate layer may be omitted, and the zeolite-containing layer may also serve as the laminate layer. However, it is preferable to provide a laminate layer from the viewpoint of further improving the adhesion between the barrier material and the sealant material.

  Although the heat seal layer is provided in the above-described embodiment, the present invention is not limited to this, and the heat seal layer may be omitted, and the zeolite-containing layer may also serve as the heat seal layer. However, it is preferable to provide a heat seal layer from the viewpoint of further increasing the heat seal strength.

EXAMPLES Hereinafter, although an Example is shown and this invention is demonstrated, this invention is not limited to a following example.
The materials used in this example are as follows.

(Materials used)
<Base material>
PA: nylon, Harden film N1102 (trade name), manufactured by Toyobo Co., Ltd.
-Al vapor-deposited PET: VM-PET (trade name), manufactured by Toray Film Processing Co., Ltd.
<Barrier material>
-Al vapor-deposited PET: VM-PET (trade name), manufactured by Toray Film Processing Co., Ltd.
EVOH: Eval (trade name), manufactured by Kuraray Co., Ltd.
<Sealant material>
PE: LLDPE, Rix (trade name), manufactured by Toyobo Co., Ltd.
<Zeolite>
Hydrophilic zeolite a: molecular sieve (trade name), average particle size = 10 μm, Na ion, SiO ₂ / Al ₂ O ₃ ratio = 2.3, crystal water amount = 240 mol, manufactured by Union Showa Co., Ltd.
Hydrophilic zeolite b: molecular sieve (trade name), average particle size = 10 μm, Ca ion, SiO ₂ / Al ₂ O ₃ ratio = 2.3, crystal water amount = 240 mol, manufactured by Union Showa Co., Ltd.
Hydrophilic zeolite c: Molecular sieve (trade name), average particle size = 10 μm, K ion, SiO ₂ / Al ₂ O ₃ ratio = 3, crystal water amount = 21 mol, manufactured by Union Showa Co., Ltd.
Hydrophobic zeolite: Hydrophobic molecular sieve (trade name), average particle size = 10 μm, Na ion, SiO ₂ / Al ₂ O ₃ ratio = 50, crystal water amount = 16 mol, manufactured by Union Showa Co., Ltd.

(Examples 1-11, Comparative Examples 1-4)
<Examples 1 to 11 and Comparative Examples 2 to 4>
According to the structure of Table 1, the films for Examples 1-11 and Comparative Examples 2-4 were manufactured. The sealant material is obtained by molding the constituent materials of each layer by a co-extruder. The base material, the barrier material, and the sealant material are stacked so that the laminate layer is in contact with the barrier material, and heated (55 ° C.) while pressing (0.4 MPa), and Examples 1 to 11 and Comparative Examples 2 to 2 are performed. A film for packaging 4 was obtained.
In Example 2, the base material PET was disposed as the outermost layer. In Examples 1-2, Examples 5-11, and Comparative Examples 2-4, the barrier material PET was placed in contact with the substrate.
<Comparative Example 1>
A packaging film was produced in the same manner as in Example 1 except that no barrier material was provided. At this time, the base material and the sealant material were arranged so that the laminate layer was in contact with the base material.

(Evaluation method)
Using the packaging film obtained in each example, a flat bag of 200 mm × 300 mm was produced.
Next, the coffee beans were roasted, and the roasted coffee beans were allowed to stand at 23 ° C. and a humidity of 50% RH for 1 hour. 500 g of the coffee beans after standing were put in the above flat bag and sealed to prepare a sample.
This sample was stored at 23 ° C. for 8 hours.
About the sample after storage, the swelling degree, the strength of the odor, and the residual odor of the original coffee were evaluated as follows. The evaluation results are shown in Table 1.

<Degree of swelling>
The degree of swelling of the bag after the storage was visually observed and evaluated based on the following evaluation criteria.
[Evaluation criteria for swelling]
A: Almost no change is observed compared to before storage.
○: Slight swelling is observed compared to before storage.
Δ: Swelling is observed as compared to before storage.
X: A big swelling is recognized compared with before storage.
XX: The bag burst during storage.

<Strength of odor and persistence of original odor of coffee>
The bag after the storage was opened, and the five panelists scored the strength of the odor felt at that time and the residual odor of the original coffee odor according to the following criteria. The average value of scoring results of five panelists was classified and evaluated according to the following evaluation criteria.

[Judgment criteria for odor intensity]
4 points: A very strong odor is felt.
3 points: A slightly strong odor is felt.
2 points: A weak odor is felt.
1 point: A slight odor is felt.
0 points: No odor at all.
[Evaluation criteria for odor intensity]
A: 3 or more points.
○: 2 points or more and less than 3 points.
Δ: 1 point or more and less than 2 points.
X: Less than 1 point.

[Judgment criteria for residual odor of coffee]
4 points: The original odor remains without weakening.
3 points: The original odor is slightly weakened.
2 points: The original odor is reduced to about half.
1 point: The original odor is very weak.
0 points: The original odor is not felt.
[Evaluation criteria for residual odor of coffee]
A: 3 or more points.
○: 2 points or more and less than 3 points.
Δ: 1 point or more and less than 2 points.
X: Less than 1 point.

(Comprehensive evaluation)
Based on the evaluation results of the above-mentioned “degree of swelling”, “strength of odor”, and “residence of original odor of coffee”, the films for packaging in each example were classified and evaluated as follows. A comprehensive evaluation of A to C was accepted.
A: In the above evaluations of “degree of swelling”, “odor intensity”, and “residence of original odor of coffee”, the evaluation results are all “◎”.
B: In each evaluation of the above-mentioned “degree of swelling”, “strength of odor”, and “residence of original odor of coffee”, one or more evaluation results are “◯”, and “Δ”, “×” ”And“ XX ”.
C: In each of the evaluations of “degree of swelling”, “strength of odor” and “residence of original odor of coffee”, one evaluation result is “Δ”, and “×” and “XX” There is no "".
D: In each evaluation of the “degree of swelling”, “strength of odor” and “residence of original odor of coffee”, the evaluation result is two or more “Δ”, or one or more “×” "Or" XX ".

As shown in Table 1, in Examples 1 to 11 to which the present invention was applied, comprehensive evaluations were “A” to “C”.
On the other hand, when the film for packaging bodies (Comparative Example 1) having no barrier material was used, no odor remained in the bag after storage, and the original odor of coffee was not felt.
When a film for packaging (Comparative Example 2) in which the mass ratio (hydrophilic / hydrophobic ratio) of the hydrophilic zeolite to the hydrophobic zeolite contained in the zeolite-containing layer is less than the lower limit of the present invention is used, the carbon dioxide gas adsorptivity Was insufficient, and the bag after storage was greatly inflated. This is thought to be because the hydrophobicity of the zeolite-containing layer becomes too high and carbon dioxide cannot be sufficiently adsorbed and absorbed.
When a film for packaging (Comparative Example 3) having a “hydrophilic / hydrophobic ratio” of the zeolite-containing layer exceeding the upper limit of the present invention is used, the carbon dioxide adsorbability is insufficient, and the bag after storage expands. It is. This is because the hydrophilicity of the zeolite-containing layer becomes too high, and water vapor (water molecules) and nitrogen gas are preferentially adsorbed and absorbed by the zeolite-containing layer over carbon dioxide, resulting in a decrease in the amount of carbon dioxide adsorbed. it is conceivable that. Furthermore, when the film for packaging bodies of Comparative Example 3 was used, the original odor persistence of coffee was not sufficient. This is presumably because the odor (odor component) inherent to coffee was adsorbed and absorbed in the zeolite-containing layer.
When a film for packaging (Comparative Example 4) in which the metal ion of the hydrophilic zeolite contained in the zeolite-containing layer was potassium ion was used, the carbon dioxide gas adsorbability was insufficient, and the bag burst during storage. This is presumably because hydrophilic zeolite containing potassium ions has small pores in the zeolite and cannot adsorb and absorb carbon dioxide. In Comparative Example 4, since the bag ruptured during storage, the “odor intensity” after storage and “residence of the original odor of coffee” were not evaluated.
From the above results, it was confirmed that by applying the present invention, the carbon dioxide gas adsorptivity was excellent and the original odor of the contents could be maintained.

DESCRIPTION OF SYMBOLS 1,100 Film 20 for packaging bodies, 120 Barrier material 30 Sealant material 34 Zeolite content layer

Claims (4)

A barrier material, and a sealant material provided on one surface of the barrier material,
The sealant material includes a zeolite-containing layer containing a hydrophilic zeolite and a hydrophobic zeolite,
The hydrophilic zeolite is a zeolite having Na ions and / or a zeolite having Ca ions,
The film for packaging bodies, wherein a mass ratio represented by hydrophilic zeolite / hydrophobic zeolite in the zeolite-containing layer is 5/5 to 9/1.   The packaging film according to claim 1, wherein the sealant material includes a laminate layer, the zeolite-containing layer, and a heat seal layer in order from the barrier material side.   The packaging film according to claim 1 or 2, which is used for packaging roasted coffee beans or a pulverized product thereof.   The packaging body by which the film for packaging bodies as described in any one of Claims 1-3 is bag-formed.

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