JP2012056593A - Package - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a package having excellent oxygen absorbability.SOLUTION: The package 100 includes a lid member 300 and a bottom member 200. The bottom member 200 is sealed with the lid member 300. At least one of the lid member 300 and the bottom member 200 is made of a film absorbing oxygen. The oxygen concentration inside the package 100 makes transits over the values between not less than 0% and not more than 50% of the initial oxygen concentration after being reduced to the value of not less than 0% and not more than 50% of the initial oxygen concentration inside the package 100 when the lid member 300 is sealed with the bottom member 200.

Description

  The present invention relates to a package for storing foods and beverages.

  Conventionally, a plastic packaging body is used as a packaging container for storing foods and beverages. When foods and beverages are wrapped in this package, oxygen may remain inside the package. In addition, a plastic package is inferior in oxygen barrier properties as compared to a metal or glass package. For this reason, oxygen tends to enter the inside of the package from the outside. The oxygen that has entered the inside of the package oxidizes and alters the contents of food and beverage.

  For the problem caused by oxygen inside the package, for example, Patent Document 1 includes an oxygen absorbing layer that contains an oxygen absorbing resin and does not contain an oxygen absorbing reaction catalyst, and is a layer adjacent to the oxygen absorbing layer. Discloses an oxygen-absorbing multilayer body selected from the group consisting of an oxygen barrier layer, a thermoplastic resin layer, and an adhesive layer.

JP 2009-12443 A

  The package including the oxygen-absorbing multilayer body described in Patent Document 1 can absorb oxygen inside the package with the oxygen absorption layer. However, recently, an oxygen-absorbing multilayer body superior in oxygen-absorbing property has been demanded.

  The objective of this invention is providing the package which is excellent in oxygen absorptivity.

(1)
The package according to the present invention includes a lid member and a bottom member. A lid is sealed to the bottom material. At least one of the lid member and the bottom member is made of a film that absorbs oxygen. In this packaging body, the oxygen concentration inside the packaging body decreases to a value of 0% to 50% of the initial oxygen concentration inside the packaging body when the lid is sealed to the bottom material, and then the initial oxygen concentration. The value of 0% or more and 50% or less of.

  In this package, the oxygen concentration inside the package decreases to a value of 0% or more and 50% or less of the initial oxygen concentration inside the package when the lid is sealed to the bottom material. Then, after the oxygen concentration decreases, the oxygen concentration inside the package changes from 0% to 50% of the initial oxygen concentration. Therefore, this package is excellent in oxygen absorptivity and can maintain an oxygen concentration at a value lower than the initial oxygen concentration.

(2)
In the packaging body of (1) above, the oxygen concentration inside the packaging body is a value of 0% or more and 50% or less of the initial oxygen concentration inside the packaging body when 10 days have elapsed since the lid was sealed to the bottom material. It is preferable to decrease to.

  In this package, the oxygen concentration inside the package decreases to a value between 0% and 50% of the initial oxygen concentration inside the package when 10 days have elapsed since the lid was sealed to the bottom material. Therefore, this package is excellent in the rate of absorbing oxygen.

(3)
In the package of the above (1) or (2), it is preferable that the oxygen concentration inside the package changes from 0% to 50% of the initial oxygen concentration inside the package for 20 days or more.

  In this package, the oxygen concentration inside the package changes from 0% to 50% of the initial oxygen concentration for 20 days or more. Therefore, this package can maintain an oxygen concentration having a value lower than the initial oxygen concentration for 20 days or more.

(4)
In the package of the above (3), it is preferable that the oxygen concentration inside the package transitions from 0% to 50% of the initial oxygen concentration inside the package for 30 days or more.

  In this package, the oxygen concentration inside the package changes from 0% to 50% of the initial oxygen concentration for 30 days or more. Therefore, this package can maintain an oxygen concentration lower than the initial oxygen concentration for 30 days or more.

(5)
In the package of any one of the above (1) to (4), the oxygen concentration inside the package decreases to 0% or more and 20% or less of the initial oxygen concentration inside the package, and then the initial oxygen concentration becomes 0%. It is preferable to shift the value from% to 20%.

  In this package, the oxygen concentration inside the package decreases to a value of 0% or more and 20% or less of the initial oxygen concentration inside the package when the lid is sealed to the bottom material. After the oxygen concentration decreases, the oxygen concentration inside the package changes from 0% to 20% of the initial oxygen concentration. Therefore, this package is excellent in oxygen absorptivity.

(6)
In the package of the above (5), the oxygen concentration inside the package is a value of 0% or more and 20% or less of the initial oxygen concentration inside the package when 10 days have elapsed since the lid was sealed to the bottom material. It is preferable to decrease to.

  In this package, the oxygen concentration inside the package decreases to a value between 0% and 20% of the initial oxygen concentration inside the package when 10 days have elapsed since the lid was sealed to the bottom material. Therefore, this package is superior to the rate of absorbing oxygen.

(7)
It is preferable that the package in any one of the above (1) to (6) absorb oxygen inside the package in an environment of 5 ° C.

  This package absorbs oxygen inside the package in an environment of 5 ° C. For this reason, even when the package is stored at a low temperature of 5 ° C., the package can absorb oxygen.

  The package according to the present invention is excellent in oxygen absorption.

It is sectional drawing of the package which concerns on one Embodiment of this invention. It is an enlarged view of A part of the package shown in FIG. It is sectional drawing which showed the state which is measuring the oxygen absorption amount inside a package with the trace amount oxygen analyzer for foodstuffs. It is a figure which shows the change of the oxygen concentration inside the pocket of the package which concerns on Example 1. FIG. It is a figure which shows the change of the oxygen concentration inside the pocket of the package which concerns on Example 2. FIG. It is a figure which shows the change of the oxygen concentration inside the pocket of the package which concerns on Example 3. FIG. It is a figure which shows the change of the oxygen concentration inside the pocket of the package which concerns on Example 4. FIG. It is a figure which shows the change of the oxygen concentration inside the pocket of the package which concerns on the comparative example 1. FIG.

  As shown in FIG. 1, the package 100 according to the present embodiment mainly includes a bottom material 200 and a lid material 300. Hereinafter, each configuration of the package 100 will be described in detail.

<Bottom material>
As shown in FIG. 2, the bottom material 200 is made of a film that absorbs oxygen (hereinafter referred to as “oxygen absorbing film”), and mainly includes an outer layer 210, a first adhesive layer 220, a barrier layer 230, a second layer. The adhesive layer 240, the oxygen absorbing layer 250, and the seal layer 260 are formed by laminating in this order. A pocket 270 is formed in the bottom material 200 such that the outer layer 210 of the bottom material 200 is on the outside and the seal layer 260 is on the inside (see FIG. 1).

(1) Outer layer The material of the outer layer 210 may be anything as long as it has a strength that can be used as the bottom material 200. For example, a polyester resin is used. When the outer layer 210 is made of a polyester resin, the oxygen-absorbing film has high rigidity and good transparency and surface gloss. For this reason, the package 100 is not easily deformed by an external force, and is excellent in appearance and texture.

  As the polyester resin used for the outer layer 210, a saturated polyester resin is used. The saturated polyester resin has a divalent acid such as terephthalic acid as an acid component or a derivative thereof having an ester forming ability, a glycol having 2 to 10 carbon atoms as a glycol component, and other divalent alcohol or ester forming ability. And their derivatives. Specifically, examples of the polyester-based resin include polyethylene terephthalate resin, polybutylene terephthalate resin, polytrimethylene terephthalate resin, polyalkylene terephthalate resin such as polyhexamethylene terephthalate resin, and copolyester resin.

(2) First Adhesive Layer As a material of the first adhesive layer 220, a known adhesive resin, for example, an adhesive polyolefin resin, is used. Specifically, as the material of the first adhesive layer 220, for example, an ethylene-methacrylate-glycidyl acrylate terpolymer, or various polyolefins to a monobasic unsaturated fatty acid, a dibasic unsaturated fatty acid, or these An anhydride grafted (maleic acid grafted ethylene-vinyl acetate copolymer, maleic acid grafted ethylene-α-olefin copolymer, etc.) and the like are used. Examples of monobasic unsaturated fatty acids include acrylic acid and methacrylic acid. Examples of the dibasic unsaturated fatty acid include maleic acid, fumaric acid, itaconic acid and the like.

  The first adhesive layer 220 may contain an antioxidant or may not contain an antioxidant. When the first adhesive layer 220 contains an antioxidant, examples of the antioxidant include known antioxidants such as hindered phenol-based antioxidants, phosphorus-based antioxidants, thioether-based antioxidants, Used alone or in combination of two or more.

(3) Barrier Layer The barrier layer 230 limits the permeation of oxygen that enters from the outside of the package 100. As a material of the barrier layer 230, a known material having an oxygen barrier property, for example, a polyvinyl alcohol resin, an ethylene-vinyl alcohol copolymer resin (hereinafter referred to as “EVOH resin”), a polyvinylidene chloride resin, or a diamine. A polyamide resin having an aromatic ring as a component is used. The EVOH resin is obtained, for example, by saponifying an ethylene vinyl acetate copolymer. The barrier layer 230 preferably has an oxygen permeability of 200 ml / (m ² · 24 h · atm) or less, more preferably an oxygen permeability of 10 ml / (m ² · 24 h · atm) or less, The rate is more preferably 1 ml / (m ² · 24 h · atm) or less.

(4) Second Adhesive Layer As a material for the second adhesive layer 240, a known adhesive resin, for example, an adhesive polyolefin resin, or the like is used. Specifically, as the material of the second adhesive layer 240, for example, ethylene-methacrylate-glycidyl acrylate terpolymer, or various polyolefins to monobasic unsaturated fatty acid, dibasic unsaturated fatty acid, or these An anhydride grafted (maleic acid grafted ethylene-vinyl acetate copolymer, maleic acid grafted ethylene-α-olefin copolymer, etc.) and the like are used. Examples of monobasic unsaturated fatty acids include acrylic acid and methacrylic acid. Examples of the dibasic unsaturated fatty acid include maleic acid, fumaric acid, itaconic acid and the like.

  The second adhesive layer 240 may contain an antioxidant or may not contain an antioxidant. When the second adhesive layer 240 contains an antioxidant, examples of the antioxidant include known antioxidants such as hindered phenol-based antioxidants, phosphorus-based antioxidants, thioether-based antioxidants, Used alone or in combination of two or more.

(5) Oxygen Absorbing Layer The oxygen absorbing layer 250 includes an oxygen absorbing resin that is an oxygen absorbent and an oxygen absorbing reaction catalyst. As the oxygen absorbing resin, an unsaturated polyolefin oxygen absorbing resin or the like is used. Specifically, examples of the oxygen-absorbing resin include an ethylenically unsaturated hydrocarbon polymer, a main chain ethylenically unsaturated hydrocarbon polymer, a polyether unit polymer, a copolymer of ethylene and a distorted cyclic alkylene, a polyamide resin, and an acid. Modified polybutadiene, hydroxyaldehyde polymer, or the like is used alone or mixed with a base resin that does not affect the transparency other than the oxygen-absorbing resin.

  As the oxygen absorption reaction catalyst, a transition metal catalyst such as zinc stearate, cobalt stearate, cobalt naphthenate, zinc naphthenate, acetylacetonate zinc, acetylacetonate cobalt or acetylacetonate copper is used. The content of the oxygen absorption reaction catalyst is 100 ppm or more and 5000 ppm or less by weight with respect to the oxygen absorption layer 250. In particular, the content of the oxygen absorption reaction catalyst is preferably 500 ppm or more and 5000 ppm or less by weight with respect to the oxygen absorption layer 250, and more preferably 1000 ppm or more and 5000 ppm or less by weight with respect to the oxygen absorption layer 250. Preferably, the weight ratio with respect to the oxygen absorption layer 250 is 3000 ppm or more and 5000 ppm or less, and the weight ratio with respect to the oxygen absorption layer 250 is more preferably 3500 ppm or more and 5000 ppm or less.

  The oxygen absorption layer 250 may contain an antioxidant or may not contain an antioxidant. When the oxygen absorbing layer 250 contains an antioxidant, examples of the antioxidant include known antioxidants such as hindered phenol antioxidants, phosphorus antioxidants, and thioether antioxidants. Or a mixture of two or more. The content of the antioxidant in the oxygen absorption layer 250 is not less than 0 ppm and not more than 170 ppm by weight with respect to the oxygen absorption layer 250. In particular, the content of the antioxidant in the oxygen absorption layer 250 is preferably 0 ppm or more and 120 ppm or less by weight with respect to the oxygen absorption layer 250, and is 5 ppm or more and 120 ppm or less by weight with respect to the oxygen absorption layer 250. More preferably, it is more preferably 5 ppm or more and 60 ppm or less by weight with respect to the oxygen absorption layer 150.

(6) Seal layer The seal layer 260 has a sealing function for sealing the lid member 300 to the bottom member 200 (heat seal, ultrasonic seal, high frequency seal, impulse seal, etc.), and is accommodated in the package 100. The contents are not adversely affected. As the material of the sealing layer 260, low density polyethylene (LDPE) resin, linear low density polyethylene (LLDPE) resin, medium density polyethylene (MDPE) resin, high density polyethylene (HDPE) resin, polypropylene (PP) resin, ethylene -Vinyl acetate copolymer (EVA) resin, ethylene-methyl methacrylate copolymer (EMMA) resin, ethylene-ethyl acrylate copolymer (EEA) resin, ethylene-methyl acrylate copolymer (EMA) resin, ethylene-ethyl Acrylate-maleic anhydride copolymer (E-EA-MAH) resin, ethylene-acrylate copolymer (EAA) resin, ethylene-methacrylic acid copolymer (EMAA) resin, ionomer (ION) resin, etc. Or two or more types are used in combination.

  The seal layer 260 may contain an antioxidant or may not contain an antioxidant. When the seal layer 260 contains an antioxidant, examples of the antioxidant include known antioxidants such as hindered phenol antioxidants, phosphorus antioxidants, thioether antioxidants, and the like. Or two or more types are used in combination.

<Cover material>
Examples of the material of the lid member 300 include a biaxially stretched polypropylene film (OPP film), a biaxially stretched polyethylene terephthalate film (VM-PET film) on which a metal oxide is deposited, or a film in which a polyethylene resin is laminated. It is done.

  Contents (not shown) such as food, beverages or industrial parts are accommodated in the pockets 270 of the bottom member 200 from which the internal air has been removed. After the contents are stored in the pocket 270, the lid member 300 is sealed to the bottom member 200, and the pocket 270 of the bottom member 200 is sealed.

  Next, Examples 1 to 4 and Comparative Example 1 according to the package 100 of the present invention will be described. In addition, this invention is not limited at all by these Examples.

Example 1
<Production of bottom material>
A copolymer polyester resin (manufactured by Eastman Chemical Japan Co., Ltd., product name: GN071) was prepared as a resin constituting the outer layer 210. An adhesive polyolefin-based resin (manufactured by Mitsui Chemicals, Inc., product name: SF740) was prepared as a resin constituting the first adhesive layer 220. As a resin constituting the barrier layer 230, an EVOH resin (manufactured by Kuraray Co., Ltd., product name: J171B) was prepared. An adhesive polyolefin-based resin (manufactured by Mitsui Chemicals, product name: LF308) was prepared as a resin constituting the second adhesive layer 240. As a resin constituting the oxygen absorbing layer 250, a resin in which a base resin was mixed at 80% by weight and an unsaturated polyolefin-based oxygen absorbing resin at a ratio of 20% by weight was prepared. An LDPE resin (manufactured by Ube Maruzen Polyethylene Co., Ltd., product name: F522N) was prepared as a resin constituting the seal layer 260.

  Cobalt stearate, an oxygen absorption reaction catalyst, is added to the mixture of the base resin of the oxygen absorption layer 250 and the unsaturated polyolefin-based oxygen absorption resin so that the content ratio is 1000 ppm by weight with respect to the oxygen absorption layer 250. did. Further, the mixture of the base resin of the oxygen absorbing layer 250 and the unsaturated polyolefin oxygen absorbing resin has a hindered phenolic antioxidant (BASF) so that the content is 120 ppm by weight with respect to the oxygen absorbing layer 250. Product name: IRGANOX 1010) was added. Note that the antioxidant was not added to the second adhesive layer 240 and the seal layer 260.

  The LDPE resin of the sealing layer 260, the mixture of the base resin and unsaturated polyolefin-based oxygen-absorbing resin of the oxygen-absorbing layer 250, the adhesive polyolefin-based resin of the second adhesive layer 240, the EVOH resin of the barrier layer 230, and the first The adhesive polyolefin resin of the adhesive layer 220 and the copolymerized polyester resin of the outer layer 210 were coextruded in this order to produce an oxygen absorbing film. In the obtained oxygen absorbing film, the thickness of the sealing layer 260 is 10 μm, the thickness of the oxygen absorbing layer 250 is 30 μm, the thickness of the second adhesive layer 240 is 40 μm, the thickness of the barrier layer 230 is 40 μm, and the first adhesive. The thickness of the layer 220 was 20 μm, and the thickness of the outer layer 210 was 90 μm.

Using a deep drawing type fully automatic vacuum packaging machine (manufactured by MULTIVAC, model number: R-530), pockets 270 (long side 160 mm × short side 105 mm) on the oxygen absorbing film under conditions of a molding temperature of 95 ° C. and a molding time of 3 seconds. X depth 1.5 mm, surface area 240 cm ² inside the pocket) was molded to produce the bottom material 200.

<Physical properties of oxygen absorbing film of bottom material>
The thickness of the oxygen absorbing film of the bottom material 200 was 0.21 mm when measured with a dial gauge. When the tensile strength of the oxygen absorbing film of the bottom material 200 was measured according to JIS Z 1702, it was 43 N / mm ² in the longitudinal direction (MD) of the oxygen absorbing film and 41 N / mm in the width direction (TD) of the oxygen absorbing film. ² . The elongation at break of the oxygen absorbing film of the bottom material 200 was 400% in the longitudinal direction (MD) of the oxygen absorbing film and 360% in the width direction (TD) of the oxygen absorbing film as measured according to JIS Z 1702. It was. When the tear strength of the oxygen absorbing film of the bottom material 200 was measured according to JIS K 6301, it was 1900 N / cm in the longitudinal direction (MD) of the oxygen absorbing film and 1800 N / cm in the width direction (TD) of the oxygen absorbing film. there were. The light transmittance of the oxygen absorbing film of the bottom material 200 was 89.3% when measured according to JIS K 7361. The haze of the oxygen-absorbing film of the bottom material 200 was 2.8% when measured according to JIS K 7136.

<Production of lid material>
An LLDPE resin (manufactured by Prime Polymer Co., Ltd., product name: ULT ZEXX 2022L) was formed by a T-die extrusion method to obtain an LLDPE film having a thickness of 30 μm. This LLDPE film, a biaxially stretched polypropylene film (OPP film) with a thickness of 30 μm, and a 12 μm thick biaxially stretched polyethylene terephthalate film (VM-PET film) subjected to aluminum vapor deposition are bonded together by a dry laminating method, A lid member 300 which is a multilayer film was produced.

<Production of packaging>
After removing the air inside the pocket 270, the bottom member 200 and the lid member 300 were heat-sealed and sealed at 135 ° C. for 1.5 seconds, and the package 100 was produced. The volume of the pocket 270 of the package 100 was 250 cm ³ .

<Measurement of oxygen absorption>
As shown in FIG. 3, when the bottom material 200 and the lid material 300 are heat sealed using a trace oxygen analyzer 400 for food (manufactured by Iijima Electronics Co., Ltd., model number: IS-300), that is, the package 100. The oxygen concentration in the pocket 270 of the package 100 after a predetermined number of days had elapsed was measured. Specifically, the needle 410 of the food trace oxygen analyzer 400 is pierced into the lid member 300 via the adhesive rubber 420, and the inside of the package 100 is stored under the conditions of a storage temperature of 5 ° C. and a sampling time of 7 seconds. The oxygen concentration was measured.

  As a result of measuring the oxygen concentration inside the package 100, the oxygen concentration inside the package 100 (hereinafter referred to as “initial oxygen concentration”) when the bottom material 200 and the lid member 300 are heat sealed is 0.131. %Met. When 0.125 days (3 hours) passed, the oxygen concentration inside the package 100 was 0.111%. The oxygen concentration inside the package 100 when 0.625 days (15 hours) elapsed was 0.091%. When two days passed, the oxygen concentration inside the package 100 was 0.038%. The oxygen concentration inside the package 100 after 3 days was 0.030%. When 10 days passed, the oxygen concentration inside the package 100 was 0.007%. When 17 days passed, the oxygen concentration inside the package 100 was 0.009%. When 24 days passed, the oxygen concentration inside the package 100 was 0.012%. The oxygen concentration inside the package 100 after 31 days was 0.009%. When 38 days passed, the oxygen concentration inside the package 100 was 0.012% (see Table 1 below). FIG. 4 is a graph of the above values.

  Moreover, when calculating based on the value of the measured oxygen concentration, the oxygen concentration inside the package 100 when 0.125 days (3 hours) has elapsed is 84.7% of the initial oxygen concentration inside the package 100. It became the value of. When 0.625 days (15 hours) passed, the oxygen concentration inside the package 100 was 69.5% of the initial oxygen concentration inside the package 100. The oxygen concentration inside the package 100 after 2 days was 29.0% of the initial oxygen concentration inside the package 100. The oxygen concentration inside the package 100 when 3 days passed was 22.9% of the initial oxygen concentration inside the package 100. When 10 days passed, the oxygen concentration inside the package 100 was 5.3% of the initial oxygen concentration inside the package 100. The oxygen concentration inside the package 100 after 17 days was 6.9% of the initial oxygen concentration inside the package 100. The oxygen concentration inside the package 100 after 24 days was 9.2% of the initial oxygen concentration inside the package 100. The oxygen concentration inside the package 100 after 31 days was 6.9% of the initial oxygen concentration inside the package 100. The oxygen concentration inside the package 100 after 38 days was 9.2% of the initial oxygen concentration inside the package 100 (see Table 1 below).

(Example 2)
A hindered phenolic antioxidant (product name: IRGANOX1010) is added to the adhesive polyolefin resin of the second adhesive layer 240 so that the content ratio is 800 ppm by weight with respect to the second adhesive layer 240. The package 100 was produced in the same manner as in Example 1 except that the thickness of the second adhesive layer 240 was 20 μm, and the bottom material 200 and the lid material 300 were heat-sealed in the same manner as in Example 1. From time to time, the oxygen concentration inside the package 100 after a predetermined number of days passed was measured. The physical properties of the oxygen absorbing film of the bottom material 200 were almost the same as the physical properties of the oxygen absorbing film of Example 1.

  As a result, the initial oxygen concentration inside the package 100 was 0.134%. When 0.125 days (3 hours) passed, the oxygen concentration inside the package 100 was 0.103%. When 0.625 days (15 hours) passed, the oxygen concentration inside the package 100 was 0.066%. When two days passed, the oxygen concentration inside the package 100 was 0.040%. When 3 days passed, the oxygen concentration inside the package 100 was 0.028%. When 10 days passed, the oxygen concentration inside the package 100 was 0.013%. When 17 days passed, the oxygen concentration inside the package 100 was 0.008%. When 24 days passed, the oxygen concentration inside the package 100 was 0.011%. The oxygen concentration inside the package 100 after 31 days was 0.006%. When 38 days passed, the oxygen concentration inside the package 100 was 0.011% (see Table 1 below). FIG. 5 is a graph of the above values.

  Moreover, when calculating based on the value of the measured oxygen concentration, the oxygen concentration inside the package 100 when 0.125 days (3 hours) has elapsed is 76.9% of the initial oxygen concentration inside the package 100. It became the value of. The oxygen concentration inside the package 100 after 0.625 days (15 hours) was 49.3% of the initial oxygen concentration inside the package 100. The oxygen concentration inside the package 100 after 2 days was 29.9% of the initial oxygen concentration inside the package 100. When 3 days passed, the oxygen concentration inside the package 100 was 20.9% of the initial oxygen concentration inside the package 100. The oxygen concentration inside the package 100 after 10 days was 9.7% of the initial oxygen concentration inside the package 100. The oxygen concentration inside the package 100 after 17 days was 6.0% of the initial oxygen concentration inside the package 100. The oxygen concentration inside the package 100 when 24 days passed was a value of 8.2% of the initial oxygen concentration inside the package 100. When 31 days passed, the oxygen concentration inside the package 100 was 4.5% of the initial oxygen concentration inside the package 100. The oxygen concentration inside the package 100 after 38 days was a value of 8.2% of the initial oxygen concentration inside the package 100 (see Table 1 below).

Example 3
Except that the thickness of the second adhesive layer 240 is 20 μm, the package 100 is produced in the same manner as in Example 1, and the bottom material 200 and the lid material 300 are heat-sealed in the same manner as in Example 1. From this, the oxygen concentration inside the package 100 was measured. The physical properties of the oxygen absorbing film of the bottom material 200 were almost the same as the physical properties of the oxygen absorbing film of Example 1.

  As a result, the initial oxygen concentration inside the package 100 was 0.087%. When 0.125 days (3 hours) passed, the oxygen concentration inside the package 100 was 0.024%. When 0.625 days (15 hours) elapsed, the oxygen concentration inside the package 100 was 0.017%. The oxygen concentration inside the package 100 after 2 days was 0.025%. When 3 days passed, the oxygen concentration inside the package 100 was 0.016%. When 10 days passed, the oxygen concentration inside the package 100 was 0.011%. When 17 days passed, the oxygen concentration inside the package 100 was 0.007%. When 24 days passed, the oxygen concentration inside the package 100 was 0.010%. When 31 days passed, the oxygen concentration inside the package 100 was 0.007%. When 38 days passed, the oxygen concentration inside the package 100 was 0.010% (see Table 1 below). FIG. 6 is a graph of the above values.

  Moreover, when calculating based on the value of the measured oxygen concentration, the oxygen concentration inside the package 100 when 0.125 days (3 hours) has elapsed is 27.6% of the initial oxygen concentration inside the package 100. It became the value of. The oxygen concentration inside the package 100 when 0.625 days (15 hours) elapsed was 19.5% of the initial oxygen concentration inside the package 100. The oxygen concentration inside the package 100 after 2 days was 28.7% of the initial oxygen concentration inside the package 100. The oxygen concentration inside the package 100 after 3 days was 18.4% of the initial oxygen concentration inside the package 100. When 10 days passed, the oxygen concentration inside the package 100 was 12.6% of the initial oxygen concentration inside the package 100. When 17 days passed, the oxygen concentration inside the package 100 was 8.0% of the initial oxygen concentration inside the package 100. The oxygen concentration inside the package 100 after 24 days was 11.5% of the initial oxygen concentration inside the package 100. The oxygen concentration inside the package 100 when 31 days passed was a value of 8.0% of the initial oxygen concentration inside the package 100. The oxygen concentration inside the package 100 after 38 days was 11.5% of the initial oxygen concentration inside the package 100 (see Table 1 below).

Example 4
The package 100 was prepared in the same manner as in Example 3 except that the resin constituting the oxygen absorbing layer 250 was prepared by mixing 90% by weight of the base resin and 10% by weight of the unsaturated polyolefin-based oxygen absorbing resin. After the bottom material 200 and the lid material 300 were heat sealed, the oxygen concentration inside the package 100 after a predetermined number of days was measured in the same manner as in Example 1. The physical properties of the oxygen absorbing film of the bottom material 200 were almost the same as the physical properties of the oxygen absorbing film of Example 1.

  As a result, the initial oxygen concentration inside the package 100 was 0.124%. When 0.125 days (3 hours) passed, the oxygen concentration inside the package 100 was 0.123%. When 0.625 days (15 hours) elapsed, the oxygen concentration inside the package 100 was 0.079%. When two days passed, the oxygen concentration inside the package 100 was 0.053%. When 3 days passed, the oxygen concentration inside the package 100 was 0.049%. When 10 days passed, the oxygen concentration inside the package 100 was 0.009%. When 17 days passed, the oxygen concentration inside the package 100 was 0.006%. When 24 days passed, the oxygen concentration inside the package 100 was 0.010%. The oxygen concentration inside the package 100 after 31 days was 0.006%. When 38 days passed, the oxygen concentration inside the package 100 was 0.012% (see Table 1 below). FIG. 7 is a graph of the above values.

  Further, when calculated based on the measured oxygen concentration value, the oxygen concentration inside the package 100 after 0.125 days (3 hours) is 99.2% of the initial oxygen concentration inside the package 100. It became the value of. The oxygen concentration inside the package 100 when 0.625 days (15 hours) had elapsed was a value of 63.7% of the initial oxygen concentration inside the package 100. The oxygen concentration inside the package 100 after 2 days was 42.7% of the initial oxygen concentration inside the package 100. The oxygen concentration inside the package 100 after 3 days was 39.5% of the initial oxygen concentration inside the package 100. The oxygen concentration inside the package 100 after 10 days was 7.3% of the initial oxygen concentration inside the package 100. When 17 days passed, the oxygen concentration inside the package 100 was 4.8% of the initial oxygen concentration inside the package 100. The oxygen concentration inside the package 100 after 24 days was 8.1% of the initial oxygen concentration inside the package 100. The oxygen concentration inside the package 100 after 31 days was 4.8% of the initial oxygen concentration inside the package 100. The oxygen concentration inside the package 100 after 38 days was 9.7% of the initial oxygen concentration inside the package 100 (see Table 1 below).

(Comparative Example 1)
<Production of bottom material>
A copolymerized polyester resin (Eastman Chemical Japan, product name: GN071) was prepared as a resin constituting the outer layer. An adhesive polyolefin resin (manufactured by Mitsui Chemicals, product name: SF740) was prepared as a resin constituting the first adhesive layer and the second adhesive layer. An EVOH resin (manufactured by Kuraray Co., Ltd., product name: J171B) was prepared as a resin constituting the barrier layer. A polyamide-based resin (manufactured by Ube Industries, Ltd., product name: 1030B) was prepared as a resin constituting the intermediate layer. As a resin constituting the seal layer, an LLDPE resin (manufactured by Prime Polymer Co., Ltd., product name: 2022L) was prepared.

  LDPE resin for sealing layer, adhesive polyolefin resin for second adhesive layer, polyamid resin for intermediate layer, EVOH resin for barrier layer, adhesive polyolefin resin for first adhesive layer, and copolymerization of outer layer A polyester resin was coextruded in this order to produce a film. In the obtained film, the thickness of the sealing layer is 10 μm, the thickness of the second adhesive layer is 10 μm, the thickness of the intermediate layer is 10 μm, the thickness of the barrier layer is 10 μm, the thickness of the first adhesive layer is 10 μm, The thickness of the outer layer was 160 μm.

<Physical properties of oxygen absorbing film of bottom material>
The thickness of the oxygen-absorbing film as the bottom material was 0.21 mm as measured with a dial gauge. The tensile strength of the oxygen-absorbing film of the bottom material was subjected to measurement by JIS Z 1702, 69N / mm ² in the longitudinal direction (MD) of the oxygen-absorbing film, 68N / mm ² in the width direction of the oxygen-absorbing film (TD) Met. When measured according to JIS Z 1702, the elongation at break of the oxygen absorbing film of the bottom material was 420% in the longitudinal direction (MD) of the oxygen absorbing film and 440% in the width direction (TD) of the oxygen absorbing film. . The tear strength of the oxygen-absorbing film of the bottom material was 2400 N / cm in the longitudinal direction (MD) of the oxygen-absorbing film and 2400 N / cm in the width direction (TD) of the oxygen-absorbing film when measured according to JIS K 6301. It was. The light transmittance of the oxygen-absorbing film of the bottom material was 90.5% when measured according to JIS K 7361. The haze of the bottom material oxygen-absorbing film was 3.2% as measured by JIS K7136.

  Except for the production of the bottom material, a package is produced in the same manner as in Example 1, and the packaging after a predetermined number of days has passed since the bottom material 200 and the lid material 300 are heat-sealed in the same manner as in Example 1. The oxygen concentration inside the body was measured.

  As a result, the initial oxygen concentration inside the package was 0.116%. When 0.125 days (3 hours) passed, the oxygen concentration inside the package 100 was 0.116%. When 0.625 days (15 hours) passed, the oxygen concentration inside the package 100 was 0.135%. When two days passed, the oxygen concentration inside the package 100 was 0.117%. When 3 days passed, the oxygen concentration inside the package 100 was 0.128%. When 10 days passed, the oxygen concentration inside the package 100 was 0.150%. When 17 days passed, the oxygen concentration inside the package 100 was 0.138%. When 24 days passed, the oxygen concentration inside the package 100 was 0.168%. When 31 days passed, the oxygen concentration inside the package 100 was 0.211%. When 38 days passed, the oxygen concentration inside the package 100 was 0.250% (see Table 1 below). FIG. 8 is a graph of the above values.

  Moreover, when calculating based on the value of the measured oxygen concentration, the oxygen concentration inside the package 100 when 0.125 days (3 hours) has elapsed is 100.0% of the initial oxygen concentration inside the package 100. It became the value of. When 0.625 days (15 hours) passed, the oxygen concentration inside the package 100 was 116.4% of the initial oxygen concentration inside the package 100. The oxygen concentration inside the package 100 after 2 days was 100.9% of the initial oxygen concentration inside the package 100. When 3 days passed, the oxygen concentration inside the package 100 was 110.3% of the initial oxygen concentration inside the package 100. When 10 days passed, the oxygen concentration inside the package 100 was 129.3% of the initial oxygen concentration inside the package 100. The oxygen concentration inside the package 100 after 17 days was 119.0% of the initial oxygen concentration inside the package 100. The oxygen concentration inside the package 100 after 24 days was 144.8% of the initial oxygen concentration inside the package 100. When 31 days passed, the oxygen concentration inside the package 100 was 181.9% of the initial oxygen concentration inside the package 100. When 38 days passed, the oxygen concentration inside the package 100 was 215.5% of the initial oxygen concentration inside the package 100 (see Table 1 below).

  The oxygen concentration inside the package 100 according to Examples 1 to 4 was a value that decreased from the initial oxygen concentration during the elapsed days from 0.125 days (3 hours) to 38 days. On the other hand, the oxygen concentration inside the package according to Comparative Example 1 was a value increased from the initial oxygen concentration during the elapsed days from 0.125 days (3 hours) to 38 days. Therefore, the package 100 according to Examples 1 to 4 had higher oxygen absorbability than the package according to Comparative Example 1. Moreover, the package 100 which concerns on Examples 1-4 was absorbing oxygen in 5 degreeC environment.

  When the elapsed days were 10 days, the oxygen concentration inside the package 100 according to Examples 1 to 4 decreased to a value of 0% or more and 20% or less of the initial oxygen concentration. In addition, the oxygen concentration inside the package 100 according to Examples 1 to 4 changed from 0% to 20% of the initial oxygen concentration during the period from 10 days to 38 days. In addition, the oxygen concentration inside the package 100 according to Examples 1 to 4 changed from 0% to 50% of the initial oxygen concentration during the elapsed days from 2 days to 38 days.

<Effect in this embodiment>
As described above, in the packaging body 100 according to the present embodiment, when two or more days have elapsed since the lid member 300 was sealed to the bottom material 200, the oxygen concentration inside the packaging body 100 is the initial value inside the packaging body 100. It decreases to a value of 0% to 50% of the oxygen concentration. Then, after the oxygen concentration decreases, the oxygen concentration inside the package 100 changes from 0% to 50% of the initial oxygen concentration. Therefore, this package 100 is excellent in oxygen absorptivity and can maintain an oxygen concentration lower than the initial oxygen concentration.

  In the packaging body 100 according to the present embodiment, when 10 days have elapsed since the lid member 300 was sealed to the bottom material 200, the oxygen concentration inside the packaging body 100 is 0 of the initial oxygen concentration inside the packaging body 100. % To 50% or less. Therefore, this package 100 is excellent in the speed | rate which absorbs oxygen.

  Further, in the package 100 according to the present embodiment, the oxygen concentration inside the package 100 is a value of 0% to 50% of the initial oxygen concentration, and the elapsed days are from 2 days to 38 days, that is, 20 days. It will be more than that. Therefore, this package 100 can maintain an oxygen concentration having a value lower than the initial oxygen concentration for 20 days or more.

  In the package 100 according to the present embodiment, the oxygen concentration inside the package 100 is a value of 0% to 50% of the initial oxygen concentration, and the elapsed days are from 2 days to 38 days, that is, 30 days. It will be more than that. Therefore, this package 100 can maintain an oxygen concentration having a value lower than the initial oxygen concentration for 30 days or more.

  In the packaging body 100 according to the present embodiment, when 10 days or more have elapsed since the lid member 300 was sealed to the bottom material 200, the oxygen concentration inside the packaging body 100 is the initial oxygen concentration inside the packaging body 100. Decrease to a value between 0% and 20%. Then, after the oxygen concentration decreases, the oxygen concentration inside the package 100 changes from 0% to 20% of the initial oxygen concentration. Therefore, this package 100 is excellent in oxygen absorptivity.

  In the packaging body 100 according to the present embodiment, when 10 days or more have elapsed since the lid member 300 was sealed to the bottom material 200, the oxygen concentration inside the packaging body 100 is the initial oxygen concentration inside the packaging body 100. Decrease to a value between 0% and 20%. Therefore, this package 100 is more excellent at the rate of absorbing oxygen.

  Moreover, in the package 100 which concerns on this embodiment, oxygen in the package 100 is absorbed in 5 degreeC environment. For this reason, even when the package 100 is stored at a low temperature of 5 ° C., the package 100 can absorb oxygen.

<Modification>
(A)
For example, an iron powder-based oxygen absorbent mainly made of iron powder may be used as the oxygen absorbent of the oxygen absorbing layer 250 instead of the oxygen-absorbing resin. In this case, the iron powder-based oxygen absorbent is added to a known thermoplastic resin, for example, polyolefins such as polyethylene, polypropylene, polybutadiene, and polymethylpentene, elastomers and modified products thereof, or mixed resins thereof. Used.

(B)
Only the lid 300 may be a package made of an oxygen absorbing film, or both the bottom material 200 and the lid 300 may be a package made of an oxygen absorbing film.

(C)
The oxygen absorbing film of the package 100 may be composed only of the barrier layer 230 and the oxygen absorbing layer 250. The oxygen absorbing film of the package 100 may be composed of at least one of the outer layer 210, the first adhesive layer 220, and the second adhesive layer 240, the barrier layer 230, and the oxygen absorbing layer 250.

  Since the package according to the present invention is excellent in oxygen absorption, it can be suitably used for packaging foods, beverages, or industrial parts that hate oxidation.

100 Packaging 200 Bottom material 300 Lid

Claims (7)

A package comprising a lid and a bottom material to which the lid is sealed,
At least one of the lid member and the bottom member is made of a film that absorbs oxygen,
The oxygen concentration inside the package body changes to the value after decreasing to 0% or more and 50% or less of the initial oxygen concentration inside the package body when the lid member is sealed to the bottom material. A package characterized by.   The oxygen concentration inside the package decreases to a value of 0% or more and 50% or less of the initial oxygen concentration inside the package when 10 days have elapsed since the lid was sealed to the bottom material. The package according to claim 1.   The packaging body according to claim 1 or 2, wherein the oxygen concentration inside the packaging body changes for 20 days or more from 0% to 50% of the initial oxygen concentration inside the packaging body.   4. The package according to claim 3, wherein the oxygen concentration inside the package changes from 0% to 50% of the initial oxygen concentration inside the package for 30 days or more.   5. The oxygen concentration in the package body changes to the value after decreasing to a value of 0% or more and 20% or less of the initial oxygen concentration in the package body. 6. Packaging.   The oxygen concentration inside the package decreases to a value of 0% or more and 20% or less of the initial oxygen concentration inside the package when 10 days have elapsed since the lid was sealed to the bottom material. The package according to claim 5.   The package according to any one of claims 1 to 6, which absorbs oxygen inside the package in an environment of 5 ° C.

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