JPH1134205A - Light-shielding packaging material for oily foods - Google Patents

Abstract

(57) Abstract: The present invention is to provide a packaging material for an oily food according to the type of fat or oil contained in the oily food made of a plastic film not using an aluminum foil or an aluminum vapor-deposited film. . The present invention provides a light-shielding packaging material for oil-based foods, which classifies oil-based foods according to the type of fats and oils contained therein, according to the degree of oxidation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preserving oily foods, and more particularly to a packaging material packaged with a packaging material made of aluminum foil or a plastic film not containing aluminum (not containing aluminum). The present invention relates to a light-shielding packaging material for oil-based foods, which prevents oxidation of the food and preserves it for a long time.

[0002]

2. Description of the Related Art Foods containing fats and oils such as snacks, chocolates, peanuts, fried foods (hereinafter referred to as oily foods) are easily oxidized, and the oxidation is accelerated by the influence of light. In the case of using and storing, an aluminum foil excellent in oxygen barrier properties and light shielding properties, or a packaging material using an aluminum vapor-deposited film is used.

[0003] A packaging material using this aluminum foil has the above-mentioned advantages, but has a drawback that it is difficult to incinerate it after disposal after use. In addition, aluminum deposition film,
Since the amount of aluminum used is very small, there is no problem at the time of disposal, but there is a problem that the appearance is difficult to distinguish from aluminum foil.

On the other hand, a film using no aluminum foil or aluminum vapor-deposited film has no problem at the time of disposal, but has a poor oxygen barrier property and does not have a light-shielding property. It was thought that the fats and oils were easily oxidized due to the influence and could not be used as it was. In some cases, polyvinylidene chloride (PVDC) film, PVDC coated film, or saponified ethylene / vinyl acetate copolymer film is used as the oxygen barrier packaging material, but chlorine gas is generated during incineration. There is a problem such as a decrease in oxygen barrier properties under high humidity environments.

In view of the above, a packaging material described in Japanese Patent Application No. 8-138281 has been proposed as a packaging material having an oxygen barrier property and a light shielding property in place of a packaging material using an aluminum foil or an aluminum vapor-deposited film.

However, the types of oils and fats contained in oily foods differ from food to food, and the susceptibility of oily foods to oxidation depends on the type of oils and fats contained. In other words, in oily foods containing oils and fats that are easily oxidized, even if packaged with a film having oxygen barrier properties and light shielding properties, if there is oxygen in the packaging, it will be oxidized, while in oily foods containing oils and fats that are hardly oxidized, Even if oxygen is present, it is not oxidized if it is shielded from light.

In other words, the packaging material described in Japanese Patent Application No. 8-138281 cannot be used for all oily foods, and some oily foods do not require oxygen barrier properties.

[0008]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a packaging material for an oily food according to the type of fat contained in the oily food made of a plastic film without using an aluminum foil or an aluminum vapor-deposited film. With the goal.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems. That is, the invention according to claim 1 is a packaging material containing no aluminum for packaging an oily food containing an oil or fat having an iodine value of 50 or less, and a plastic having a light-shielding layer having a total light transmittance of 30% or less. A light-shielding packaging material for oily foods, which is made of a film,
It is what it was. The invention according to claim 2 is an aluminum-free packaging material for packaging an oily food containing an oil or fat having an iodine value of 100 or less, wherein the plastic film is provided with a light-shielding layer having a total light transmittance of 10% or less. And a light-shielding packaging material for oil-based foods. According to a third aspect of the present invention, there is provided the light-shielding packaging material for oil-based food according to the first or second aspect, wherein the light-shielding layer is provided by a printed layer. According to a fourth aspect of the present invention, there is provided the light-shielding packaging material for oily food according to the first or second aspect, wherein the light-shielding layer is provided by a colored resin layer. Claim 5
The invention described in (1) is the light-shielding packaging material for oil-based foods according to (1) or (2), wherein the light-shielding layer is provided by a printing layer and a colored resin layer.
The present invention provides a light-shielding packaging material for oil-based foods, which classifies oil-based foods according to the type of fats and oils contained in the foods, and the degree of oxidation.

The susceptibility of fats and oils to oxidation is determined by the number of unsaturated bonds contained in the fatty acids constituting the fats and oils. The number of the unsaturated bonds is represented by an iodine value as an amount of iodine that can be bound to 100 g of fats and oils. According to the results of experiments by the inventor, fats and oils having an iodine value of 50 or less are hardly oxidized, and can be prevented from being oxidized as long as they can shield light. On the other hand, fats and oils having an iodine value of 100 or more are oxidized in the presence of oxygen even when shielded from light. In the case of an oily food containing a plurality of fats and oils instead of a single fat or oil such as soybean oil or palm oil, the iodine value may be determined by regarding the sum of those fats and oils as one kind of fat and oil.

An oily food comprising an oil having an iodine value of 50 or less does not require an oxygen barrier property for a packaging material in a normal storage state, as long as it can shield light to some extent. Therefore, if such an oily food is packaged in a packaging material having a total light transmittance of 30% or less, oxidation of fats and oils can be prevented.

An oily food comprising an oil having an iodine value of 50 to 100 is susceptible to light, but if it is packaged in a packaging material having a total light transmittance of 10% or less and transmitting almost no light, the oil and fat can be obtained. Oxidation can be prevented. In addition, there is no problem even if this storage method is applied to an oily food comprising an oil or fat having an iodine value of 50 or less.

[0013] Oily foods composed of oils and fats having an iodine value of 100 or more are oxidized in the presence of oxygen even when completely shielded from light, so that gas replacement packaging is necessary. Sex is required. In this case, since there is no oxygen in the package, the package is not oxidized by the influence of light, and the packaging material of the present invention does not need to be used.

Next, the light-shielding packaging material for oily foods of the present invention will be described.

The light-shielding packaging material used for preserving an oily food comprising an oil or fat having an iodine value of 100 or less is a laminated plastic film comprising at least a base film and a sealant layer. , At least a white first printing layer and brown or black or silver,
A packaging material provided with a predetermined light-shielding property by providing a second print layer of a color having an excellent light-shielding property. Further, instead of the printing layer, a colored resin layer of white, brown, black or the like may be provided between the base film and the sealant layer as a light shielding layer. Further, the light-shielding layer may be formed by using the above-mentioned printing layer and the colored resin layer in combination.

In the case of oily foods having an iodine value of 100 or less and whose quality is deteriorated by moisture absorption, the packaging material does not need an oxygen barrier property but needs a water vapor barrier property. Therefore, a packaging material having a water vapor barrier property may be used after imparting light shielding properties.

[0017] The water vapor barrier wrapping material is a laminated plastic film comprising at least a substrate and a sealant layer,
This is a packaging material provided with a metal oxide deposited layer as a water vapor barrier layer. Instead of the metal oxide vapor-deposited layer, a packaging material provided with a coating layer containing a water-soluble polymer and a metal alkoxide or a hydrolyzate thereof as a water vapor barrier layer may be used. Furthermore, a packaging material in which a coating layer containing a water-soluble polymer and a metal alkoxide or a hydrolyzate thereof is provided as a water vapor barrier layer on the surface of the metal oxide vapor deposition layer may be used. Although not related to the present invention, these water vapor barrier layers also have oxygen barrier properties.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a cross-sectional view illustrating the structure of a light-shielding packaging material A used in the present invention, wherein 1 is a base film, 2 is a first white printed layer, 3 is brown and black. , Silver color,
The second printing layer having a color excellent in light-shielding properties and 4 are light-shielding packaging materials formed of a sealant layer.

FIG. 2 is a sectional view showing another structure.
A light-shielding packaging material A provided with a colored resin layer 5 instead of the printing layer of FIG.

FIG. 3 is also a sectional view showing another structure.
In addition to the light-shielding packaging material having the configuration shown in FIG.
Is a light-shielding packaging material A provided with.

FIG. 4 is a sectional view for explaining the structure of the light-shielding packaging material B having a water vapor barrier property. The metal oxide vapor deposition layer 6 is provided on the base film 1 of the light-shielding packaging material having the configuration of FIG. It is a packaging material having a water vapor barrier property and a light shielding property.

FIG. 5 is a sectional view showing another structure.
A light-shielding packaging material B having a water vapor barrier property provided with a water vapor barrier coating layer 7 instead of the metal oxide vapor-deposited layer of FIG.

FIG. 6 is a sectional view showing another structure.
This is a light-shielding packaging material B having a water vapor barrier property in which a coating layer 7 is provided on the surface of the metal oxide deposition layer 6 in FIG.

In addition to the above-mentioned light-shielding packaging material B having a water vapor barrier property, a metal oxide vapor deposited layer or the like between the base film 1 and the first printed layer 2 or the colored resin layer 5 shown in FIGS. A light-shielding packaging material having a water vapor barrier property may be provided by providing a water vapor barrier coating layer or both.

The base film 1 used for the light-shielding packaging material A and the light-shielding packaging material B having a water vapor barrier property is a film having mechanical strength, and is specifically made of polyethylene terephthalate, polyamide, or polypropylene. Of the films, stretched films are preferred. Known additives such as, for example, an antistatic agent, an ultraviolet absorber, a plasticizer, a lubricant, and a coloring agent can be added to the base film, and are appropriately added as needed.

The sealant layer 4 is made of polyethylene,
Resins having heat sealing properties such as polypropylene and ethylene / vinyl acetate copolymer can be used. The sealant layer 4 may be provided by laminating a film-forming material via an adhesive, or may be formed by directly laminating a molten resin by extrusion coating. In addition, it is preferable to use polypropylene for oily foods from the point of oil resistance.

The first light-shielding packaging material A shown in FIGS.
The print layer 2 and the second print layer 3 are provided directly on the surface of the base film 1, but when the light-shielding packaging material B having a water vapor barrier property shown in FIGS. 4, 5 and 6 is used. Is provided directly on the surface of the metal oxide deposition layer 6 or the coating layer 7. As the ink for forming the printing layer, a urethane-based ink having excellent adhesion is preferable. The first print layer 2
In addition to the configuration in which the entire surface is provided with an ink containing 5 to 10% by weight of a white pigment such as titanium oxide, a configuration in which printing partially provided with an ink of another color is combined. The second print layer 3
An ink having a high light-shielding property, for example, an ink containing 10 to 20% by weight of a brown or black pigment or aluminum paste is provided on the entire surface. Further, although not shown in the figure, a third printing layer made of white ink or the like may be provided in order to improve light-shielding properties or to hide the color of the second printing layer after opening.

The light-shielding packaging material A shown in FIGS.
The colored resin layer 5 is obtained by dispersing a pigment in a resin such as polypropylene or polyethylene in an amount of 5 to 15% by weight.
If it is less than 5% by weight, the light-shielding property is poor, and if it is more than 15% by weight, the resin layer becomes brittle. As a pigment, high concealing properties,
It is preferable to use a pigment that sufficiently blocks ultraviolet light and visible light, and the color is not particularly limited as long as the necessary light-shielding property is obtained. The colored resin layer 5 may be provided by laminating a colored film on the base film 1 via an adhesive, or by laminating a molten colored resin directly on the base film 1 by extrusion coating. It may be laminated with the sealant layer 4 by co-extrusion coating.

It is sufficient that the necessary light-shielding properties can be obtained by the printing or the coloring resin layer or the combination of the two.

The metal oxide vapor deposition layer 6 of the light-shielding packaging material B having a water vapor barrier property shown in FIGS. 4 and 6 is made of a simple substance of an oxide such as silicon, aluminum, titanium, zirconium, tin or magnesium, or a composite thereof. Made of things,
It is formed on the surface of the base film 1 by a vacuum process such as a vacuum deposition method, a sputtering method, and a plasma vapor deposition method. The thickness of the metal oxide deposited layer 6 is 100 to 2
The range of 000 ° is suitable in terms of water vapor barrier properties.

The coating layer 7 of the light-shielding packaging material B having a water vapor barrier property shown in FIGS. 5 and 6 comprises a water-soluble polymer and (a) at least one metal alkoxide and a hydrolyzate thereof, or (b) A) An aqueous solution containing at least one of tin chloride, or a coating agent mainly containing a water / alcohol mixed solution. A solution obtained by dissolving a water-soluble polymer and tin chloride in an aqueous solvent, or a solution obtained by directly mixing a metal alkoxide or a solution obtained by preliminarily hydrolyzing a metal alkoxide is mixed with the base film 1 or a metal oxide. It is formed by coating the material deposition layer 6 and drying by heating.

The components such as the water-soluble polymer and the metal alkoxide contained in the coating agent are as described in, for example, Japanese Patent Application No. 8-138281.

As a method for applying the coating agent, known means such as a dipping method, a roll coating method, a screen printing method, and a spray method which are usually used are used. The thickness of the coating layer varies depending on the type of the coating agent, but may be in the range of 0.01 to 100 μm after drying. If the thickness is 50 μm or more, the coating layer 7 is liable to crack. It is desirable that

The oil and fat contained in the oily food has an iodine value of 10
In the case of 0 or less, from the light-shielding packaging material A obtained as described above, a necessary light-shielding property (total light transmittance of 30% or less, or 10% or less) according to the iodine value of the fat or oil contained in the oily food is used. ) Is selected, and the wrapping material is used as a pillow packaging bag, a four-sided sealing bag, with the sealant layer 4 as an inner surface.
It is formed into a container such as a three-sided seal bag, a gusset-shaped bag, a standing pouch, or the like, and an oily food having an iodine value of 100 or less is hermetically packaged and stored in the container.

In the case of oily foods comprising oils and fats having an iodine value of 100 or less, oily foods in which the quality is deteriorated by moisture absorption are prepared by using the light-shielding packaging material B having a water vapor barrier property in the same manner as in the case of the above-mentioned light-shielding packaging material. The oily food is preserved by molding into a container and packaging the oily food in the container.

The present invention relates to a packaging material having a total light transmittance of 30% or less by using a white first printing layer and a second printing layer having a high light-shielding color, or a colored resin layer, or both. Is used to obtain an oily food comprising an oil or fat having an iodine value of 50 or less, and a total light transmittance of 10
% Or less, the use of a packaging material having an iodine value of 100 or less makes it possible to preserve oily foods made of fats and oils. Further, in the case of an oil-based food having a problem of moisture absorption, a package made of a plastic film having a water vapor barrier property provided with a metal oxide vapor deposition layer and / or a coating layer containing a water-soluble polymer and a metal alkoxide or a hydrolyzate thereof is provided. By using the material, an oily food having an iodine value of 100 or less can be stored.

[0037]

【Example】

<Packaging Material Configuration> The configurations of the packaging materials prepared for the tests of the examples and the comparative examples and the total light transmittance of the packaging materials are shown below. Note that the packaging material 4, the packaging material 5, and the packaging material 6 are configured to have a water vapor barrier property. [Composition of packaging material] [Total light transmittance] Packaging material 1: ONy / black resin layer / CPP 28.3% Packaging material 2: ONy / white printing layer / brown printing layer / CPP 18.5% Packaging material 3: ONy / white printing layer / silver printing layer / brown resin layer / CPP 8.8% Packaging material 4: OPP / coating layer / white printing layer / brown printing layer / CPP 16.8% Packaging material 5: PET / deposited layer ( Aluminum oxide / coating layer / white printing layer / silver printing layer / brown resin layer / CPP 7.4% Packaging material 6: PET / deposited layer (silicon oxide) / white resin layer / CPP 36.6% ONy: thickness 20 μm PET: 12 μm-thick polyethylene terephthalate film OPP: 25 μm-thick biaxially-stretched polypropylene film CPP: 30 μm-thick non-stretched polypropylene film White printing layer: LP Super White · The (manufactured by Toyo Ink Mfg. Co., Ltd.) 200 lines, plate depth 30 [mu] m 7.0 g / m ² coated brown printed layer by using a gravure plate of: applying a LP Super tea ink white similar gravure silver printed layer: LP super white ink with 15% by weight of aluminum paste is applied with the same gravure plate as white color Black resin layer: Low-density polyethylene with a thickness of 20 μm mixed with 8% by weight of carbon black Brown resin layer: Titanium oxide, iso Indolinone yellow,
Low-density polyethylene having a thickness of 20 μm in which 2% by weight of a pigment in which perylene red and carbon black are mixed White resin layer: Thickness 2 in which 7% by weight of titanium oxide powder is mixed
0 μm low-density polyethylene Evaporated layer: silicon oxide or aluminum oxide with a thickness of 400
(4) Vapor deposited film Coating layer: 89.6 g of 0.1 N hydrochloric acid was added to 10.4 g of tetraethoxysilane, and the mixture was stirred for 30 minutes and hydrolyzed at a solid content of 3% by weight, and 3% by weight of polyvinyl alcohol. % Water / isopropyl alcohol (90 /
10) A coating film having a thickness of about 0.5 μm, which is coated and dried with a coating solution obtained by mixing the solutions.

<Example 1> A bag having a size of 100 mm x 100 mm was prepared from the packaging material 1, the packaging material 2 and the packaging material 3,
Among them, palm oil (iodine value (IV): 48, initial peroxide value (POV): 2.6 meq./kg) and hardened tallow oil (IV: 42, initial POV: 0.3 meq./k)
g) was filled and sealed so that about 10 to 20 cc of air remained, and POV was measured after irradiation with a 2000 lux fluorescent lamp at room temperature for 2 weeks. here,
POV is a value indicating the amount of peroxide generated by oxidation of fats and oils, and a larger value indicates that the fats and oils are oxidized. Table 1 shows the results.

<Comparative Example 1> The same test as in Example 1 was performed using the packaging material 9 described above. Table 1 shows the results.

<Embodiment 2> Using the packaging material 3, Embodiment 1
Olive oil (IV: 85, initial PO)
V: 1.8 meq. / Kg). Table 1 shows the results.
Shown in

<Comparative Example 2> The same test as in Example 2 was performed using the packaging materials 1 and 2. Table 1 shows the results.

<Comparative Example 3> Using the packaging material 3, Example 1
Corn oil (IV: 129, initial PO
V: 5.6 meq. / Kg) and soybean oil (IV: 13
9, initial POV: 0.9 meq. / Kg). Table 1 shows the results.

[0043]

[Table 1]

In the above test, the storage period was as short as 2 weeks, during which the oxidation of fats and oils was accelerated by light irradiation, and the POV based on the sales standard of oil confectionery was 30 meq. /
Considering that the weight is less than kg (hereinafter, unit is omitted) (when the acid value is 5 or less), if the POV is 10 or less under these storage conditions, it can be regarded as sufficiently practical.

In the case of palm oil or tallow-hardened oil having an IV of 50 or less in Example 1, even if the packaging material has no oxygen barrier property, the packaging materials 1 and 2 having a total light transmittance of 30% or less, and The packaging material 3 could keep the POV at 10 or less. In Comparative Example 1, even with the oxygen barrier packaging material, the packaging material 9 having a total light transmittance of 36.6% has a POV of 10 with hardened tallow oil.
POV exceeded 10 for palm oil.

In Example 2 and Comparative Example 2, the olive oil having an IV of 85 was obtained by using only the packaging material 3 having the total light transmittance of 8.8%.
V was 10 or less, and the packaging materials 1 and 2 which were good in Example 1 had a POV exceeding 10.

In Comparative Example 3, corn oil or soybean oil having an IV of more than 100 had a POV of 10 or more even in packaging material 3 having a high light-shielding property.

Example 4 Potato chips (initial POV: 2.3) made using palm oil (IV: 47) were
180 mm × 250 composed of the packaging material 4 and the packaging material 5
Into a bag having a size of 65 mm, each was filled with 65 g, and stored at room temperature under a fluorescent lamp of 1500 lux for one month.
V was measured and the moisture absorption was confirmed by chewyness by a sensory test. Table 2 shows the results.

Comparative Example 4 The potato chips of Example 4 were
Using the packaging materials 3 and 6, the same storage test as in Example 4 was performed. Table 2 shows the results.

[0050]

[Table 2]

In Example 4, the POV was low and moisture absorption was not observed. On the other hand, in Comparative Example 4, although the POV was low in the packaging material 3 having no water vapor barrier property, wetness due to moisture absorption was felt, and the packaging material 6 having the water vapor barrier property but having a low light shielding property showed no moisture at all. However, the POV was high and it was near the limit of the sales standard of oil confectionery.

<Example 5> Peanuts (extracted oil and fat I
V: 91, initial POV: 5.8) were packed in a bag of 80 mm × 100 mm each made of the packaging material 5 in an amount of 40 g, and stored at room temperature for 3 months under irradiation with a fluorescent lamp of 800 lux. Thereafter, the POV was measured. Table 3 shows the results.

<Comparative Example 5> The peanut of Example 5 was subjected to the same storage test as in Example 4 using the packaging materials 3 and 4. Table 3 shows the results.

[0054]

[Table 3]

In Example 5, the POV was low, and no moisture absorption was observed. On the other hand, in Comparative Example 5, the packaging material 4
V exceeded the limit of the sales standard of the oil confectionery, and the packaging material 3 showed moisture absorption.

[0056]

According to the present invention, the light-shielding packaging material for oily foods of the present invention has the above-mentioned structure. By adjusting the light-shielding property of the oil-based food, it becomes possible to preserve (prevent oxidation) the oil-based food. The light-shielding packaging material for oil-based foods of the present invention may contain an aluminum paste in the printing ink, but does not react with the metal detector, and is a packaging material capable of detecting metal foreign matter.

Furthermore, the light-shielding packaging material for oily foods of the present invention can prevent moisture absorption of oily foods having a low moisture content by combining with a packaging material having a water vapor barrier property, and can preserve oily foods for a long period of time. .

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of a packaging material of the present invention.

FIG. 2 is a cross-sectional view showing another embodiment of the packaging material of the present invention.

FIG. 3 is a cross-sectional view showing another embodiment of the packaging material of the present invention.

FIG. 4 is a cross-sectional view showing another embodiment of the packaging material of the present invention.

FIG. 5 is a cross-sectional view showing another embodiment of the packaging material of the present invention.

FIG. 6 is a cross-sectional view showing another embodiment of the packaging material of the present invention.

[Explanation of symbols]

 1 base film 2 first print layer 3 second print layer 4 sealant layer 5 colored resin layer 6 metal oxide deposited layer 7 coating layer A light-shielding packaging Material B: Light-shielding packaging material with water vapor barrier properties

Claims (5)

[Claims] An aluminum-free packaging material for packaging an oily food containing an oil or fat having an iodine value of 50 or less, comprising a plastic film provided with a light-shielding layer having a total light transmittance of 30% or less. Light-shielding packaging material for oily foods. 2. An aluminum-free packaging material for packaging an oily food containing an oil or fat having an iodine value of 100 or less, comprising a plastic film provided with a light-shielding layer having a total light transmittance of 10% or less. Light-shielding packaging material for oily foods. 3. The light-shielding packaging material for oil-based foods according to claim 1, wherein the light-shielding layer is provided by a printing layer. 4. The light-shielding packaging material for oily foods according to claim 1, wherein the light-shielding layer is provided by a colored resin layer. 5. The light-shielding packaging material for oil-based foods according to claim 1, wherein the light-shielding layer is provided by a printing layer and a colored resin layer.