JP6801970B2 - Package - Google Patents

Description

The present invention relates to a film for a packaging body and a packaging body using the same.

Various articles such as foods, pharmaceuticals, and cosmetics are stored and distributed in a container such as a container or a bag in which the opening of the molded container is sealed with a lid material.

Roasted coffee beans, which are an example of food, or crushed products obtained by grinding the roasted coffee beans are usually stored in a plastic film package as described in, for example, Patent Document 1 and Patent Document 2.

Japanese Unexamined Patent Publication No. 8-258873 Japanese Unexamined Patent Publication No. 10-1181

Foods, pharmaceuticals, cosmetics, etc. stored as described above may be oxidized to form oxides, etc. during storage. When the oxide or the like increases, the off-flavor or off-flavor component derived from the oxide or the like increases, which may lead to a decrease in commercial value.

Conventionally, deodorants such as activated carbon have been used as a method for suppressing the generation of offensive odor components, but these deodorants not only have offensive odors but also the original good odors contained in foods, pharmaceuticals, cosmetics, etc. I will remove it.

Moisture entering from the outside causes the generation of oxides and the like. However, it has been difficult for deodorants such as those used in the past to adsorb offensive odors and water.

The present invention has been made in view of the above circumstances, and an object of the present invention is a packaging film and packaging capable of reducing offensive odor and moisture while maintaining the original odor of the contents.

The present invention has the following aspects.
[1] A hydrophobic zeolite-containing layer containing a hydrophobic zeolite and a hydrophilic zeolite-containing layer containing a hydrophilic zeolite are provided, and the hydrophobic zeolite has a molar ratio of 5 or more represented by SiO ₂ / Al ₂ O _3. The hydrophilic zeolite is a film for a packaging body having a molar ratio of less than 5 represented by SiO ₂ / Al ₂ O ₃ .
[2] The film for a packaging body according to [1], which further contains a base material, and further comprises the base material, the hydrophilic zeolite-containing layer, and the hydrophobic zeolite-containing layer in this order.
[3] The film for a packaging body according to [2], which further contains a barrier material, and further comprises the base material, the barrier material, the hydrophilic zeolite-containing layer, and the hydrophobic zeolite-containing layer in this order.
[4] A packaging body in which the packaging films of [1] to [3] are used, and the hydrophobic zeolite-containing layer is located inside the hydrophilic zeolite-containing layer.

According to the packaging film of the present invention and the packaging using the same, it is possible to reduce offensive odor and moisture while maintaining the original odor of the contents.

It is sectional drawing of the film for a packaging body which concerns on 1st Embodiment of this invention. It is sectional drawing of the film for packaging body which concerns on 2nd Embodiment of this invention.

The film for a packaging body of the present invention includes a hydrophilic zeolite-containing layer and a hydrophobic zeolite-containing layer.
Hereinafter, the packaging film of the present invention will be described with reference to embodiments.

(First Embodiment)
As shown in FIG. 1, the packaging film 100 includes a hydrophobic zeolite-containing layer 31 and a hydrophilic zeolite-containing layer 32. In this embodiment, the hydrophobic zeolite-containing layer 31 also serves as a heat seal layer.

≪Hydrophobic zeolite-containing layer≫
The hydrophobic zeolite-containing layer 31 is a resin film containing hydrophobic zeolite. Hydrophobic zeolite adsorbs hydrophobic offensive odor components generated from the contents.
Examples of the resin constituting the hydrophobic zeolite-containing layer 31 include polyolefins such as low-density polyethylene (LDPE), linear LDPE (LLDPE), medium-density polyethylene (MDPE), high-density polyethylene (HDPE), and polypropylene (PP). , Ethylene-vinyl alcohol polymer (EVOH), ethylene-vinyl acetate copolymer (EVA), ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic acid copolymer (EMAA), ethylene-ethyl acrylate copolymer Examples include coalescence (EEA) and ionomer. These resins may be used alone or in combination of two or more.

Hydrophobic zeolite in the present _invention, the molar ratio represented by SiO 2 / _Al 2 _{O 3 (hereinafter} sometimes referred to as SiO 2 / _Al 2 _{O 3} ratio) is of 5 or more. In the present invention, the hydrophobic zeolite preferably has a SiO ₂ / Al ₂ O ₃ ratio of 50 to 80. By using such a hydrophobic zeolite, an offensive odor generated from the contents can be selectively adsorbed.

The salt constituting the hydrophobic zeolite is not particularly limited, and examples thereof include Na ion, K ion, Ca ion, Mg ion, etc. Among them, Na ion and Ca ion from the viewpoint of easily maintaining the original odor of the contents. Is preferable.
The amount of water of crystallization (amount of water of crystallization) in the hydrophobic zeolite is preferably 350 mol or less, more preferably 300 mol or less, per 1 mol of the hydrophobic zeolite.
Examples of the hydrophobic zeolite include hydrophobic molecular sieves (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 not particularly limited, but is preferably 1 to 50 μm, more preferably 1 to 30 μm, further preferably 2 to 20 μm, and particularly preferably 3 to 10 μm. When the average particle size of the hydrophobic zeolite is in the above-mentioned preferable range, the hydrophobic zeolite can sufficiently act on the offensive odor without secondary agglutination, and the adsorptivity of the offensive odor is easily enhanced.

The hydrophobic zeolite content in the hydrophobic zeolite-containing layer 31 is preferably 10 to 50% by mass. When the content of the hydrophobic zeolite is at least the above lower limit value, it becomes easier to enhance the adsorptivity of offensive odors, and it becomes easier to maintain the original odor of the contents. When the hydrophobic zeolite content is not more than the above upper limit value, the hydrophobic zeolite-containing layer 31 can be easily formed without any loss.

The thickness of the hydrophobic zeolite-containing layer 31 is preferably 10 to 50 μm, more preferably 20 to 40 μm. Within the above-mentioned preferable range, the adsorptivity of offensive odor is enhanced, and the original odor of the contents can be easily maintained. If the thickness of the hydrophobic zeolite-containing layer 31 is less than 10 μm, the adsorptivity of offensive odor cannot be sufficiently obtained.

The hydrophobic zeolite-containing layer 31 may contain hydrophilic zeolite, but the molar ratio of hydrophobic zeolite to the entire zeolite contained in the hydrophobic zeolite-containing layer 31 is 0.5 or more, and 0.8 or more. It is preferably 0.95 or more, and more preferably 0.95 or more.

≪Hydrophilic zeolite-containing layer≫
The hydrophilic zeolite-containing layer 32 is a resin film containing hydrophilic zeolite. Hydrophilic zeolite adsorbs water vapor that has permeated from the outside and water generated from the contents. Hydrophilic zeolite adsorbs hydrophilic odor, but adsorbs water predominantly.
The resin constituting the hydrophilic zeolite-containing layer 32 is the same as the resin constituting the hydrophobic zeolite-containing layer 31.

Hydrophilic zeolites have a SiO ₂ / Al ₂ O ₃ ratio of less than 5. The SiO ₂ / Al ₂ O ₃ ratio of the hydrophilic zeolite is preferably 1 to 4.9, more preferably 1 to 3. The lower limit is the theoretical minimum value of the SiO ₂ / Al ₂ O ₃ ratio in zeolite. When it is in the above-mentioned preferable range, it becomes easy to maintain the original odor of the contents.
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. When it is at least the above lower limit, the hydrophobic zeolite-containing layer 31 better adsorbs the hydrophobic off-flavor component, the hydrophilic zeolite-containing layer 32 better adsorbs the hydrophilic off-flavor component, and the contents. The original odor can be maintained better.

The salt constituting the hydrophilic zeolite is the same as the salt constituting the hydrophilic zeolite.
The amount of water of crystallization (amount of water of crystallization) in the hydrophilic zeolite is preferably 100 mol or more, more preferably 150 mol or more, per 1 mol of the hydrophilic zeolite. When it is at least the above lower limit value, it becomes easy to maintain the original odor of the contents.
Examples of the hydrophilic zeolite include molecular sieve (trade name, manufactured by Union Showa Co., Ltd.), Zeolite (trade name, manufactured by Tosoh Corporation), and the like.

The average particle size of the hydrophilic zeolite is not particularly limited, but is preferably 5 to 50 μm, more preferably 5 to 30 μm, further preferably 5 to 20 μm, and particularly preferably 10 to 20 μm. If it is less than the above lower limit, when the hydrophilic zeolite-containing layer 32 is provided, the hydrophilic zeolite tends to secondarily aggregate and the particle size tends to increase, and the secondary aggregated particles damage the hydrophilic zeolite-containing layer 32. , The effect of providing the hydrophilic zeolite-containing layer 32 may be reduced. If it exceeds the above upper limit value, the particle size of the hydrophilic zeolite is too large, which may damage the hydrophilic zeolite-containing layer 32 and reduce the effect of providing the hydrophilic zeolite-containing layer 32.
The average particle size of the hydrophilic zeolite is a volume standard median diameter measured by laser diffraction.

The hydrophilic zeolite content in the hydrophilic zeolite-containing layer 32 is preferably 10 to 70% by mass, more preferably 25 to 50% by mass. When the hydrophilic zeolite content is at least the above lower limit value, it becomes easier to enhance the adsorptivity of offensive odors, and it becomes easier to maintain the original odor of the contents. When the hydrophilic zeolite content is not more than the above upper limit value, the hydrophilic zeolite-containing layer 32 can be easily formed without any loss.

The thickness of the hydrophilic zeolite-containing layer 32 is preferably 5 to 90 μm, more preferably 10 to 50 μm. When it is in the above-mentioned preferable range, the adsorptivity of water is enhanced and the original odor of the contents is easily maintained. If the thickness of the hydrophilic zeolite-containing layer 32 is less than 5 μm, the adsorptivity of the offensive odor cannot be sufficiently obtained as the adsorptivity of water decreases.

The hydrophilic zeolite-containing layer 32 may contain hydrophobic zeolite, but the hydrophilic zeolite molar ratio with respect to the entire zeolite contained in the hydrophilic zeolite-containing layer 32 is 0.5 or more, and 0.8 or more. It is preferably 0.95 or more, and more preferably 0.95 or more.

<Manufacturing method of film for packaging>
The method for producing the packaging film 100 of the first embodiment is selected from conventionally known methods according to the materials and configurations of the hydrophobic zeolite-containing layer 31 and the hydrophilic zeolite-containing layer 32. As a method for obtaining the film 1 for a package, for example, a laminate with a hydrophobic zeolite-containing layer and a hydrophilic zeolite-containing layer 32 is obtained by a coextrusion method using a T-die coextruder, an inflation coextruder, or the like. The method can be mentioned.

After producing the laminate as described above, the laminate may be heat-treated. Hydrophilic zeolite and hydrophobic zeolite are activated by heat-treating the laminate. By activating the hydrophilic zeolite, the original odor of the contents can be easily maintained. By activating the hydrophobic zeolite, the adsorptivity of offensive odor is enhanced.

The temperature of the heat treatment is 30 to 60 ° C, preferably 35 to 50 ° C.
If the temperature of the heat treatment is less than the lower limit, the activation of the hydrophobic zeolite and the hydrophilic zeolite becomes insufficient, and the adsorptivity of offensive odor and the maintenance of the original odor of the contents cannot be sufficiently obtained. If the temperature of the heat treatment exceeds the upper limit value, the film constituting the laminate may be damaged by heat.

The heat treatment time is 5 hours or more, preferably 5 to 96 hours, more preferably 12 to 48 hours. If the heat treatment time is less than the above lower limit, the activation of the hydrophobic zeolite and the hydrophilic zeolite becomes insufficient, and the adsorptivity of offensive odor and the retention of the original odor of the contents cannot be sufficiently obtained. On the other hand, even if the heat treatment time exceeds the above upper limit value, the hydrophilic zeolite and the hydrophobic zeolite are not activated any more, and the heat treatment time may be wasted and the productivity may decrease.

The heat treatment of the laminate can be performed in a conventionally known thermostatic chamber or the like.
The laminated body subjected to this heat treatment step and the laminated body not subjected to this heat treatment step can be distinguished from each other by, for example, analyzing the cured state of the adhesives of both.

(Second embodiment)
As shown in FIG. 2, the packaging film 110 according to the second embodiment of the present invention includes a base material 10, a barrier material 20, and a sealant material 30. The components described in the first embodiment have the same reference numerals, and the description thereof will be omitted.

<Base material>
Examples of the base material 10 include a resin film, paper, and a laminate thereof.
Examples of the resin film include polyethylene terephthalate (PET) such as biaxially stretched polyethylene terephthalate, biaxially stretched nylon, biaxially stretched polypropylene (OPP), non-stretched polypropylene (CPP), high density polyethylene (HDPE), and medium density polyethylene ( Examples thereof include polyolefins such as MDPE), polyamides (PA) such as biaxially stretched nylon, and laminates thereof. Among them, PET, nylon, polypropylene (PP) and PA are preferable, and biaxially stretched PET, biaxially stretched nylon and OPP are more preferable.
Examples of the laminated body include a laminated body of the above resin films.
The base material 10 may be printed on its surface or between layers.

The thickness of the base material 10 is determined in consideration of the material, composition, and the like, and is preferably 5 to 100 μm, more preferably 10 to 50 μm, for example. If it is less than the above lower limit value, the strength of the package film 1 may be lowered, and if it exceeds the above upper limit value, the flexibility of the package film 110 may be impaired and the handling may be complicated.

<Barrier material>
The barrier material 20 has a water vapor barrier property and a gas barrier property. That is, the barrier material 20 in the present invention has a role of suppressing the permeation of water vapor and the permeation of odor from the outside.
Examples of the barrier material 20 include a barrier material capable of suppressing the permeation of water vapor and the permeation of odor, and a laminate of a barrier material capable of suppressing the permeation of water vapor and a barrier material capable of suppressing the permeation of odor.
Further, as the barrier material 20, a laminate of a barrier material capable of suppressing the permeation of water vapor and the permeation of odor and a barrier material capable of suppressing the permeation of water vapor or a barrier material capable of suppressing the permeation of odor may be used.
Examples of the barrier material capable of suppressing the permeation of water vapor and the permeation of odor include metal foils such as aluminum foil and copper foil.
Examples of the barrier material capable of suppressing the permeation of water vapor include polyvinylidene chloride (PVDC), OPP and the like.
Examples of the barrier material capable of suppressing the permeation of odor include PET, EVOH, PA, polyvinyl alcohol (PVOH), polyacrylonitrile (PAN) and the like.

Water vapor permeability of the barrier material 20 is preferably 3g ^/ (m 2 · 24h) or ^{less, 1g / (m 2 · 24h} ) or less is more preferable. When it is not more than the above upper limit value, the original odor of the contents is easily maintained, and the offensive odor is easily reduced. The water vapor permeability is determined by the Mocon method of JIS K7129 (2008).
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). ^{) [= 0.987cm 3 / (m} 2 · MPa · 24h)] or less is more preferable. If it is less than the above upper limit value, the original odor of the contents can be easily maintained. The gas permeability is determined by the Mokon method of JIS K7126.

The thickness of the barrier material 20 is determined in consideration of the material, composition, and the like. When a metal foil is used as the barrier material 20, the thickness of the barrier material 20 is preferably, for example, 6 to 20 μm, more preferably 7 to 12 μm. If it is less than the above lower limit value, the water vapor barrier property and the odor barrier property may be lowered, and if it exceeds the above upper limit value, the flexibility of the package film 1 may be impaired and the handling may be 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, more preferably 12 to 15 μm. If it is less than the above lower limit value, the water vapor barrier property and the odor barrier property may be lowered, and if it exceeds the above upper limit value, the flexibility of the package film 1 may be impaired and the handling may be complicated.

The packaging film 110 of the present embodiment does not have to include the barrier material 20. In this case, by using the base material 10 as a thin-film deposition film, the base material 10 can also function as a barrier material. Examples of the vapor-deposited film include a metal-deposited film on which a metal such as aluminum is vapor-deposited, a silica-deposited film on which silica is vapor-deposited (deposited PET), and an acrylic-coated PET.

<Sealant material>
The sealant material 30 is a laminate including a hydrophilic zeolite-containing layer 32, a hydrophobic zeolite-containing layer 31, and a heat-sealing layer 33 in this order from the barrier material 20 side.

In the present embodiment, the hydrophilic zeolite-containing layer 32 also functions as a laminate layer having a role of enhancing the adhesiveness between the sealant material 30 and the barrier material 20. Also in this case, as the material constituting the hydrophilic zeolite-containing layer 32, the same material as in the first embodiment can be mentioned.
When the hydrophilic zeolite-containing layer 32 also serves as a laminate layer, the thickness of the hydrophilic zeolite-containing layer 32 is preferably 5 to 50 μm, more preferably 10 to 20 μm. If it is less than the above lower limit value, the adhesive strength of the sealant material 30 to the barrier material 20 may decrease, and if it exceeds the above upper limit value, the packaging film 1 may become too thick and the flexibility may be impaired.

The heat-sealing layer 33 enhances the sealing property of the packaging film.
Examples of the heat seal layer 33 include those similar to the resin constituting the hydrophobic zeolite-containing layer 31. Among these, LDPE, LLDPE, MDPE and HDPE are preferable, and LDPE and LLDPE are more preferable.
The heat seal layer 33 may have a single-layer structure or a multi-layer structure.
Further, for example, the heat seal layer 33 may have an easy peel property. The heat seal layer 33 having an easy peel property may be any peeling type such as a cohesive peeling type that separates phases and an interface peeling type that peels off at the interface with an adherend.

The thickness of the heat seal layer 33 is determined in consideration of the material and the like, and is preferably 5 to 50 μm, more preferably 5 to 30 μm, for example. When the thickness of the heat seal layer 36 is not more than the above lower limit value, the hydrophilic zeolite and the hydrophobic zeolite of the zeolite-containing layer are easily activated during the heat treatment, and the activated state is maintained. It becomes easy to be done. When the thickness of the heat seal layer 36 is not more than the above upper limit value, the adsorptivity of the offensive odor is likely to be enhanced, and the original odor of the contents is easily maintained.

In the present embodiment, the sealant material 30 is a laminate in which the hydrophilic zeolite-containing layer 32, the hydrophobic zeolite-containing layer 31, and the heat seal layer 33 are arranged in this order, but the present invention is not limited thereto. For example, the hydrophobic zeolite-containing layer 31 may also serve as the heat seal layer 33. In this case, it may be formed as a single layer that also serves as the heat seal layer 33 and the hydrophobic zeolite-containing layer 31.

In the present embodiment, the hydrophilic zeolite-containing layer 32 also serves as a laminate layer, but the present invention is not limited to this, and the hydrophilic zeolite-containing layer 32 and the laminate layer may be provided independently.

In the present embodiment, the hydrophilic zeolite-containing layer 32 and the hydrophobic zeolite-containing layer 31 are in contact with each other, but the present invention is not limited to this, and between the hydrophilic zeolite-containing layer 32 and the hydrophobic zeolite-containing layer 31. Other layers may be formed.

The thickness of the packaging film 110 is not particularly limited, but is preferably 40 to 250 μm, more preferably 50 to 200 μm, and even more preferably 60 to 150 μm, for example. If it is less than the above lower limit value, the strength of the package film 110 may decrease, and if it exceeds the above upper limit value, the flexibility of the package film 110 may decrease and the handling may become complicated.

<Manufacturing method of film for packaging>
The method for producing the packaging film 110 of the second embodiment includes a step of obtaining the base material 10 (base material manufacturing process), a step of obtaining the sealant material 30 (sealant material manufacturing process), and a base material 10 and a barrier material. A step (lamination step) of laminating 20 and the sealant material 30 may be provided.

The method for 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 coextrusion method, depending on the material and composition of the base material 10.

The method for obtaining the sealant material 30 in the sealant material manufacturing process is selected from conventionally known methods according to the material and composition of the sealant material 30.
As a method for obtaining the sealant material 30, for example, a hydrophobic zeolite-containing layer 31, a hydrophilic zeolite-containing layer 32, and a heat-sealing layer 33 can be obtained by a coextrusion method using a T-die coextruder, an inflation coextruder, or the like. A method of obtaining the sealant material 30 which is a laminated body can be mentioned.

The method of laminating the base material 10, the barrier material 20, and the sealant material 30 in the laminating step is selected from conventionally known methods such as a dry laminating method.
In the dry laminating method, for example, an adhesive is applied to one of the materials to be laminated, and after drying, this is pressure-bonded to the other material to obtain a laminated film. The obtained laminated film is wound into, for example, a roll.

After producing the laminated film as described above, the laminated film may be subjected to the heat treatment described in the first embodiment.

<Packaging body>
The package of the present embodiment uses the film for a package of the present invention. Examples of the packaging body include a bag made by heat-sealing the heat-sealing layers of the packaging film. Examples of the form of the package include a gassho-pasted bag, a three-way sticker bag, a four-way sticker bag, a gusset bag, a stand bag, and a bag with a zipper thereof.
Further, for example, the packaging body includes a container body having an opening and a lid made of a packaging film, and the packaging film is brought into contact with the peripheral edge of the opening of the container body to form the packaging film. An example is a heat-sealed container on the container body. The material of the container body in this case is not particularly limited, and examples thereof include PET, metal, and paper.

The packaging body using the packaging film of the present invention is configured such that the hydrophobic zeolite-containing layer 31 is arranged closer to the contents than the hydrophilic zeolite-containing layer 32. With such an arrangement, the adsorption of offensive odor components from the contents by the hydrophobic zeolite-containing layer 31 proceeds preferentially. Moisture and hydrophilic offensive odor components that have passed through the hydrophobic zeolite-containing layer 31 are adsorbed by the hydrophilic zeolite-containing layer 32. Further, the hydrophilic zeolite-containing layer 32 can adsorb moisture that invades from the outside, and can prevent a decrease in the offensive odor adsorbing ability of the hydrophobic zeolite-containing layer 31.

On the other hand, when the hydrophilic zeolite-containing layer 32 is configured to be arranged closer to the contents than the hydrophobic zeolite-containing layer 31, water adsorption is prioritized over offensive odor adsorption in the hydrophilic zeolite-containing layer 32. Therefore, it is not possible to sufficiently adsorb offensive odors.

According to the packaging film of the present embodiment, it is possible to reduce offensive odor and moisture while maintaining the original odor of the contents.
Therefore, the packaging film of the present embodiment is required to suppress off-flavors such as coffee (coffee beans) and tea (tea leaves) such as green tea and black tea, and to maintain the original odor of the contents. It is suitable as a film for packaging of beverages, foods, pharmaceuticals, cosmetics and the like.
Further, according to the packaging body made from the packaging film of the present invention, even when the above-mentioned beverages, foods, pharmaceuticals, cosmetics and the like are packaged and stored, the foods, pharmaceuticals and cosmetics being stored are stored. It maintains the original odor of foods, suppresses offensive odors, and prevents the intrusion of water vapor from the outside.

Hereinafter, the present invention will be described with reference to examples, but the present invention is not limited to the following examples.
The materials used in this example are as follows.

(Material used)
<Base material>
-PET: Lumirror (trade name), manufactured by Toray Film Processing Co., Ltd., thickness: 12 μm.
-Al-deposited PET: VM-PET (trade name), manufactured by Toray Film Processing Co., Ltd., thickness: 12 μm.
<Barrier material>
-Al: Aluminum foil, manufactured by UACJ Corporation, thickness: 7 μm.
-EVOH: EVAL (trade name), manufactured by Kuraray Co., Ltd., thickness: 15 μm.
<Sealant material>
-PE: LLDPE, Rix (trade name), manufactured by Toyobo Co., Ltd.
<Zeolite>
-Hydrophilic zeolite: average particle size = 10 μm, Na ion, crystal water amount = 240 mol.
-Hydrophobic zeolite: average particle size = 4 μm, Na ion, crystal water amount = 276 mol.

(Examples 1 to 8)
<Example 1>
≪ Laminated film manufacturing process≫
The base material, the barrier material, and the sealant material shown in Table 1 were laminated to produce a film for a packaging body according to Example 1. In the sealant material, the constituent raw materials of each layer are coextruded in the order of a hydrophilic zeolite-containing layer containing hydrophilic zeolite and PE, a hydrophobic zeolite-containing layer containing hydrophobic zeolite and PE, and a polyethylene layer (PE layer). It is molded by a machine. Further, the base material, the barrier material and the sealant material were layered and dry-laminated so that the hydrophilic zeolite-containing layer came into contact with the barrier material.
≪Heat treatment process≫
The obtained laminated film was heat-treated to produce a film for a packaging body according to Example 1.
<Example 2>
A film for a packaging body was produced in the same manner as in Example 1 except that the barrier material was not provided and the base material also served as the barrier material.
<Example 3>
A film for packaging was produced in the same manner as in Example 1 except that the sealant materials were laminated from the barrier material side to a hydrophilic zeolite-containing layer, a PE layer, and a hydrophobic zeolite-containing layer.
<Example 4>
A film for packaging was produced in the same manner as in Example 1 except that the base material also served as a barrier material and the base material was aluminum-deposited PET having a thickness of 12 μm.
<Example 5>
A film for a package was produced in the same manner as in Example 1 except that the SiO ₂ / Al ₂ O ₃ ratio of the hydrophobic zeolite-containing layer was set to 5.5.
<Example 6>
A film for a package was produced in the same manner as in Example 1 except that the SiO ₂ / Al ₂ O ₃ ratio of the hydrophilic zeolite-containing layer was set to 2.3.
<Example 7>
A film for a packaging body was produced in the same manner as in Example 1 except that the barrier material was EVOH having a thickness of 15 μm.
<Example 8>
A film for a package was produced in the same manner as in Example 1 except that the thickness of the hydrophilic zeolite-containing layer was 10 μm.

(Comparative Examples 1 to 14)
<Comparative example 1>
As shown in Table 2, a film for a packaging body is produced in the same manner as in Example 1 except that the sealant materials are laminated from the barrier material side to a hydrophobic zeolite-containing layer, a hydrophilic zeolite-containing layer, and a PE layer. did.
<Comparative example 2>
A film for a package was produced in the same manner as in Example 1 except that the thickness of the PE layer was 60 μm.
<Comparative example 3>
Instead of the hydrophobic zeolite-containing layer and the hydrophilic zeolite-containing layer, a mixed layer of hydrophobic zeolite and hydrophilic zeolite is used, and the stacking order of the sealant material is from the barrier material side to the PE layer, hydrophobic zeolite and hydrophilic zeolite. A film for a packaging body was produced in the same manner as in Example 1 except that the layer and the PE layer were used.
<Comparative example 4>
A film for packaging was produced in the same manner as in Example 1 except that the sealant materials were laminated from the barrier material side to the hydrophilic zeolite-containing layer, the PE layer, and the PE layer.
<Comparative example 5>
A film for packaging was produced in the same manner as in Example 1 except that the sealant materials were laminated in the order of the barrier material side to the PE layer, the hydrophobic zeolite-containing layer, and the PE layer.
<Comparative Example 6>
A film for a package was produced in the same manner as in Example 1 except that the thickness of the hydrophilic zeolite-containing layer was 5 μm.
<Comparative Example 7>
Packaging in the same manner as in Example 1 except that the SiO ₂ / Al ₂ O ₃ ratio of the hydrophobic zeolite-containing layer was 5.5 and the SiO ₂ / Al ₂ O ₃ ratio of the hydrophilic zeolite-containing layer was 2.3. Manufactured body film.
<Comparative Example 8>
A film for a package was produced in the same manner as in Comparative Example 1 except that the barrier material side was not provided.
<Comparative Example 9>
A film for a package was produced in the same manner as in Comparative Example 2 except that the barrier material side was not provided.
<Comparative Example 10>
A film for a package was produced in the same manner as in Comparative Example 3 except that the barrier material side was not provided.
<Comparative Example 11>
A film for a package was produced in the same manner as in Comparative Example 4, except that the barrier material side was not provided.
<Comparative Example 12>
A film for a package was produced in the same manner as in Comparative Example 5, except that the barrier material side was not provided.
<Comparative Example 13>
A film for a package was produced in the same manner as in Comparative Example 6 except that the barrier material side was not provided.
<Comparative Example 14>
A film for a package was produced in the same manner as in Comparative Example 7, except that the barrier material side was not provided.

(Evaluation method)
Using the packaging film obtained in each example, a flat bag of 150 mm × 150 mm was produced.
Next, 100 g of coffee powder and a temperature / humidity data logger (174H, manufactured by testo) were placed in the above-mentioned flat bag, sealed, and then stored in an environment of 30 ° C. and 50% humidity for 1 month.
The flat bag after storage was opened and the residual water content was measured. As for the residual water content, the humidity value immediately before opening the data measured and recorded in the temperature / humidity data logger every 10 minutes was used as the residual water content in the bag.
[Evaluation criteria for residual water content]
⊚: 2.0% or less.
◯: 2.1% or more and 3.0% or less.
Δ: 3.1% or more and 4.5% or less.
X: 4.6% or more.

Five panelists scored the original odor and offensive odor of coffee that they felt when opening the flat bag after storage according to the following criteria. The evaluation values shown in Table 3 were the average values of the scoring results of the five panelists.

[Criteria for judging the original 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 weakened by about half.
1 point: The original odor is very weak.
0 points: I do not feel the original odor.
[Evaluation criteria for the original odor of coffee]
⊚: 3 points or more.
◯: 2 points or more and less than 3 points.
Δ: 1.6 points or more and less than 2 points.
X: 1.5 points or less.

[Criteria for judging offensive odor]
4 points: I feel a very strong offensive odor.
3 points: I feel a slightly strong offensive odor.
2 points: I feel a weak offensive odor.
1 point: I feel a slight offensive odor.
0 points: No offensive odor is felt.
[Evaluation criteria for offensive odor]
⊚: Less than 1 point.
◯: 1 point or more and less than 2 points.
Δ: 2 points or more and less than 3 points.
X: 3 points or more.

(Comprehensive evaluation)
Based on the evaluation results of "moisture residue", "natural odor of coffee", and "offensive odor", the packaging films of each example were classified as follows and comprehensively evaluated.
A: In each of the above evaluations of "moisture residue", "natural odor of coffee", and "offensive odor", the evaluation results are all "◎".
B: In each of the above evaluations of "moisture residue", "natural odor of coffee", and "offensive odor", at least one of the evaluation results is "○" and there is no "△" or "×". ..
C: In each of the above evaluations of "moisture residue", "natural odor of coffee", and "offensive odor", at least one of the evaluation results is "△" and there is no "x".
D: In each of the above evaluations of "moisture residue", "natural odor of coffee", and "offensive odor", at least one of the evaluation results is "x".

As shown in Table 3, Examples 1, 3 to 8 to which the present invention was applied had an overall evaluation of "A" or "B".
On the other hand, as shown in Table 4, when the hydrophilic zeolite-containing layer was arranged on the content side (Comparative Example 1), the suppression of offensive odor was not sufficient.
It is considered that this is because the absorption of water was prioritized over the absorption of the hydrophilic off-flavor component in the hydrophilic zeolite-containing layer, and the absorption of the hydrophilic off-flavor component was insufficient.

When a packaging film having a PE layer thickness of 60 μm (Comparative Example 2) was used, the suppression of offensive odor was not sufficient.
It is considered that this is because the PE layer is too thick and a part of the original odor of coffee is absorbed by the PE layer, the balance of the odor components is lost, and a strange odor is easily perceived.

When the hydrophilic zeolite-containing layer and the hydrophobic zeolite-containing layer are not provided independently, but the hydrophilic zeolite and the hydrophobic zeolite-containing layer are arranged (Comparative Example 3), the residual odor inherent in coffee is sufficient. No, the suppression of offensive odor was not sufficient.
This is because the layer (single layer) in which hydrophilic zeolite and hydrophobic zeolite are mixed preferentially absorbs water, so that the absorption of offensive odor components is not sufficient, the balance of offensive odor components is lost, and the offensive odor is lost. It is probable that it came to feel.

When a packaging film (Comparative Example 4) without a hydrophobic zeolite-containing layer was used, the residual odor inherent in coffee was not sufficient, and the suppression of offensive odor was not sufficient.
It is considered that this is because the hydrophobic offensive odor component could not be absorbed and the offensive odor was felt, and the balance of the odor component was lost, making it difficult to feel the original odor of coffee.

When a film for a package (Comparative Example 5) without a hydrophilic zeolite-containing layer was used, the residual water content was high.
It is considered that this is because the suppression of the invasion of water from the outside was insufficient.

When a packaging film (Comparative Example 6) having a hydrophilic zeolite-containing layer having a thickness of 5 μm was used, the residual water content was high and the suppression of offensive odor was not sufficient.
This is because the suppression of the invasion of water from the outside was insufficient, and the hydrophobic zeolite-containing layer could not sufficiently absorb the offensive odor, so that the balance of the odorous components was lost and the offensive odor was easily perceived. it is conceivable that.

Film for packaging (Comparative example) in which the SiO ₂ / Al ₂ O ₃ ratio in the hydrophilic zeolite-containing layer is high (2.3) and the SiO ₂ / Al ₂ O ₃ ratio in the hydrophobic zeolite-containing layer is low (5.5). When 7) was used, the suppression of offensive odor was not sufficient.
It is considered that this is because both the suppression of the invasion of water from the outside and the adsorption of the offensive odor component are not sufficient, the balance of the odor component is lost, and the offensive odor is easily perceived.

When Example 2 which is a film for packaging containing no barrier material and Comparative Examples 8 to 14 are compared, the film for packaging of Example 2 is particularly superior in the original odor residual degree. The overall evaluation of Example 2 was C, while the overall evaluation of Comparative Examples 8 to 14 was D.
From the above results, it was confirmed that by applying the present invention, it is possible to reduce offensive odor and moisture while maintaining the original odor of the contents.

100, 110 Packaging film 10 Base material 20 Barrier material 30 Sealant material 31 Hydrophobic zeolite-containing layer 32 Hydrophilic zeolite-containing layer 33 Heat seal layer

Claims (3)

A package including a film for a package having a hydrophobic zeolite-containing layer containing a hydrophobic zeolite capable of adsorbing a hydrophobic offensive odor component and a hydrophilic zeolite-containing layer containing a hydrophilic zeolite.
The hydrophobic zeolite has a molar ratio of 50 to 80, which is represented by SiO ₂ / Al ₂ O ₃ .
The hydrophilic zeolite has a molar ratio represented by SiO ₂ / Al ₂ O ₃ of less than 5.
The hydrophobic zeolite-containing layer is a package located inside the hydrophilic zeolite-containing layer. The package according to claim 1, further comprising a base material, the base material, the hydrophilic zeolite-containing layer, and the hydrophobic zeolite-containing layer in this order. The package according to claim 2, further comprising a barrier material, the base material, the barrier material, the hydrophilic zeolite-containing layer, and the hydrophobic zeolite-containing layer in this order.

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