JP2007039079A - Deoxidation type sealed container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a smoothly unsealable oxygen absorbing sealed container which can preserve an object to be preserved without spoiling the quality and spoils no appearance without leaving an iron powder on the flange section of the container. <P>SOLUTION: A lid material has an oxygen absorbing film comprising at least a sealant layer made of a thermoplastic resin, an iron based oxygen absorbing agent containing oxygen absorbing resin layer, and a barrier layer. A barrier container has an internal surface layer comprising an easily openable thermoplastic resin layer, an intermediate layer made of a barrier type resin, and an external surface layer made of a polyolefin based thermoplastic resin. The internal surface layer of the barrier container and the sealant layer of the lid material are bonded by heat-sealing on the flange section of the barrier container to form the sealed container. In the sealed container, an interlaminar strength between the sealant layer and the oxygen absorbing resin layer in the lid material is larger than the cohesion peeling strength of the internal surface layer in the barrier container. Also, the interlaminar peeling strength between the sealant layer and the oxygen absorbing resin layer of the lid material is 600 g/15 mm or higher when a T-die peeling of the lid material is performed by a peeling speed of 300 mm/min conforming to JIS K 6854-3 for the sealed container. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a deoxidizing lid and a deoxygenating sealed container. More specifically, the present invention relates to a deoxidizing lid and a deoxidizing hermetically sealed container that are easily opened and store contents as a packaging material for foods and pharmaceuticals.

  In recent years, as one of the deoxygenation packaging technologies, a container is made up of a multilayer material in which an oxygen absorbing layer composed of an oxygen absorbing resin composition in which a deoxidizing agent is blended with a thermoplastic resin, and the gas barrier property of the container is improved. At the same time, development of packaging containers in which the container itself is provided with an oxygen absorbing function has been underway. Among these, an oxygen-absorbing multilayer body having a thin total thickness, so-called oxygen-absorbing multilayer film, is a heat in which an oxygen absorbent is dispersed as an intermediate layer in a conventional gas-barrier multilayer film in which a heat seal layer and a gas barrier layer are laminated. It is used as an oxygen absorbing layer, which is a plastic resin layer, and has a function of absorbing oxygen in the container in addition to the function of preventing oxygen permeation from the outside. Conventionally known as extrusion lamination, co-extrusion lamination, dry lamination, etc. It is manufactured using the manufacturing method.

  Specifically, as disclosed in Patent Document 1, an oxygen-absorbing multilayer film in which a thermoplastic resin layer cushion layer is interposed between an oxygen-absorbing layer and a gas barrier layer is known. As disclosed in Patent Document 2, an oxygen-absorbing multilayer film in which a smoothing layer is provided between an oxygen-absorbing layer and a gas barrier layer is known. In addition, a technique is known in which these oxygen-absorbing multilayer films are used as a lid for a barrier container and sealed with the barrier container to prevent oxidative deterioration of the contents. Further, as disclosed in Patent Document 3, a deoxygenated sealed container is known in which the inner layer of the gas barrier molded container is an easily openable resin layer and the sealant layer of the lid oxygen absorbing multilayer film is an unstretched polyolefin. In addition, a technique for smoothly opening is known.

Japanese Patent Laid-Open No. 9-40024 Japanese Patent Laid-Open No. 9-234832 JP 2003-212277 A

  However, in a deoxygenated sealed container in which the inner layer of the gas barrier molded container is an easily openable resin layer and the sealant layer of the lid oxygen absorbing multilayer film is an unstretched polyolefin, the strength of the interlayer between the sealant layer of the lid and the oxygen absorbing resin layer is weak In this case, when the container is opened, there is a problem that the easy-openability at the time of opening is not ensured, and delamination occurs between the sealant layer and the oxygen resin layer.

  As a result of intensive studies in view of the above-mentioned problems of the prior art, the present inventors have determined that the strength of the interlayer between the sealant layer and the oxygen-absorbing resin layer is a constant strength in the lid oxygen-absorbing multilayer film in which the sealant layer is an unstretched polyolefin. With the above, a deoxygenated hermetic container that ensures good easy-openability was invented.

  The present invention comprises at least a sealant layer made of a thermoplastic resin, a lid material having an oxygen-absorbing film made of an iron-based oxygen absorbent-containing oxygen-absorbing resin layer and a barrier layer, and an inner surface layer made of an easily-openable thermoplastic resin layer, In a barrier container having an intermediate layer made of a barrier resin and an outer surface layer made of a polyolefin-based thermoplastic resin, the inner surface layer of the barrier container and the sealant layer of the lid material are joined by heat sealing at the flange portion of the barrier container. In the sealed container, the interlayer strength between the sealant layer and the oxygen-absorbing resin layer in the lid material is larger than the cohesive peel strength of the inner surface layer in the barrier container, and the lid material has a peeling rate of 300 mm / min in accordance with JIS K6854-3. The peel strength between the sealant layer and the oxygen-absorbing resin layer in the case of T-peeling at 600g / 15mm or more A sealed container, characterized in that.

  According to the present invention, it can be stored without impairing the quality of the object to be stored, and when opening the oxygen-absorbing sealed container, it can be opened smoothly, and iron powder can remain in the container flange. It is prevented and the appearance is not impaired.

  The lid used for the container of the present invention is a sheet or film having an oxygen absorbing film consisting of at least a sealant layer made of a thermoplastic resin, an iron-based oxygen absorbent-containing oxygen absorbing resin layer, and a barrier layer.

  The heat seal layer constituting the oxygen-absorbing multilayer film of the lid material is a portion that becomes a sealant that is heat-sealed with the gas barrier molded container surface when the oxygen-absorbing multilayer film of the present invention is used as a lid material of a packaging container. It has a role as an isolation layer that separates the stored article from the oxygen absorbing layer, and a role as an oxygen permeable layer that allows oxygen in the packaging container to permeate and be quickly absorbed by the oxygen absorbent in the oxygen absorbing layer.

  The heat seal layer constituting the oxygen-absorbing multilayer film of the present invention can be used without limitation as long as it is an unstretched thermoplastic resin having oxygen permeability that can play the above-mentioned role. Examples of the thermoplastic resin include low-density polyethylene, linear low-density polyethylene, ultra-low-density polyethylene, various polyethylenes such as polyethylene by metallocene catalyst, ethylene-vinyl acetate copolymer, ionomer, ethylene-acrylic acid. Methyl copolymer, ethylene-ethyl acrylate copolymer, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, ethylene-methyl methacrylate copolymer, propylene homopolymer, propylene-ethylene block copolymer , Propylene-ethylene random copolymer, various polypropylenes such as polypropylene by metallocene catalyst, polymethylpentene, thermoplastic elastomer, and the like, and these can be used alone or in combination. Preferably, various polyethylenes such as low density polyethylene, linear low density polyethylene, ultra low density polyethylene, polyethylene by metallocene catalyst, propylene homopolymer, propylene-ethylene block copolymer, propylene-ethylene random copolymer, metallocene Polypropylenes such as polypropylene by catalyst, and polyolefins such as polymethylpentene.

  Add color pigments such as titanium oxide, antioxidants, slip agents, antistatic agents, stabilizers and other additives, calcium carbonate, clay, mica, silica and other fillers and deodorizers to the heat seal layer. May be.

  The film thickness of the heat seal layer constituting the oxygen-absorbing multilayer film of the lid is preferably 10 to 100 μm, more preferably 20 to 60 μm, regardless of the number of layers. If the film thickness of the heat seal layer is less than 10 μm, the oxygen absorbent in the oxygen absorption layer is exposed on the surface or the heat seal strength is lowered, which is not preferable. On the other hand, if the film thickness of the heat seal layer is greater than 100 μm, it is not preferable because lamination becomes difficult, oxygen permeability is lowered and oxygen absorption performance of the film is lowered, and there is a problem in cost.

  The oxygen-absorbing layer constituting the oxygen-absorbing multilayer film of the lid material is formed by dispersing an oxygen absorbent in a thermoplastic resin. The oxygen absorbing layer has a role of absorbing oxygen dissolved in the container or in the stored article, and also has a role of preventing a small amount of oxygen entering from the outside of the gas barrier layer to prevent oxygen permeation into the container.

  As the thermoplastic resin constituting the oxygen absorbing layer, the same resin as the resin used for the heat seal layer described above is used, but considering the bonding strength with the heat seal layer, the same kind as the heat seal layer is used. Alternatively, it is preferable to select a similar thermoplastic resin.

As the iron-based oxygen absorbent dispersed in the oxygen absorption layer, a mixture of iron powder and metal halide is used.
As the iron powder as the main agent, it can be used without any particular limitation on the purity so long as it can cause an oxygen absorption reaction. For example, a part of the surface may already be oxidized and contains other metals. It may be what you do. The iron powder is preferably granular, and for example, iron powder such as reduced iron powder, sprayed iron powder, and electrolytic iron powder, pulverized products of various iron such as cast iron and steel, and ground products are used. The average particle size is preferably in the range of 1 to 100 μm in consideration of handling properties, reducing the film thickness of the oxygen absorbing layer, and preventing asperities of the oxygen absorbent appearing in the film appearance as much as possible. In particular, the range of 1 to 80 μm is preferable.

  As the metal halide which is an auxiliary agent for the iron-based oxygen absorber, for example, alkali metal or alkaline earth metal chloride, bromide or iodide is used, and lithium, sodium, potassium, magnesium, calcium or barium chloride is used. Or iodide is preferably used. The compounding amount of the metal halide is preferably 0.1 to 20 parts by weight, particularly preferably 0.1 to 5 parts by weight per 100 parts by weight of the iron powder.

  It is preferable that the metal halide is mixed and added in advance so as not to adhere to the iron powder and easily separate. For example, a method of mixing a metal halide and iron powder using a ball mill, a speed mill, etc., a method of embedding a metal halide in the uneven portion of the iron powder surface, a method of attaching a metal halide to the iron powder surface using a binder A method of adhering a metal halide to the surface of the iron powder by drying after mixing the aqueous metal halide solution and the iron powder can be employed. A preferable oxygen absorbent is an iron powder-based composition containing iron powder and a metal halide, and particularly preferably a metal halide-coated iron powder-based composition in which a metal halide is attached to the iron powder.

  The blending amount of the oxygen absorbent in the oxygen absorbing layer is preferably in the range of 10 to 70% by weight, and more preferably in the range of 10 to 60% by weight. If the blending amount of the oxygen absorbent is lower than 10% by weight, the oxygen absorbing ability is insufficient and is not preferable. If it is higher than 70% by weight, it is difficult to form an oxygen absorbing layer, which is not preferable.

  The film thickness of the oxygen absorbing layer is preferably in the range of 10 to 100 μm, particularly preferably in the range of 20 to 80 μm, regardless of the constituent materials. If the film thickness of the oxygen absorbing layer is thinner than 10 μm, film formation becomes difficult, or the amount of oxygen absorbent per unit area of the film decreases, and sufficient oxygen absorbing performance cannot be obtained. On the other hand, if it is thicker than 100 μm, the total thickness of the film is increased, which may cause inconvenience in handling and a problem in cost.

  In addition, the oxygen absorbing layer of the present invention may contain various additives such as coloring pigments such as titanium oxide, antioxidants, slip agents, antistatic agents, stabilizers, clay, mica, silica, calcium carbonate, if necessary. In addition, fillers such as calcium sulfate and barium sulfate, deodorizers, adsorbents such as activated carbon and zeolite may be added.

  A known gas barrier material is used for the gas barrier layer constituting the oxygen-absorbing multilayer film of the lid. For example, a gas barrier thermoplastic resin such as nylon MXD6, EVOH, PVA, or PVDC, a vapor deposition film such as silica vapor deposition or alumina vapor deposition, a metal foil such as aluminum foil, or the like is used. In consideration of characteristics such as the tension of the container lid when sealed and heat sealed, a gas barrier thermoplastic resin such as EVOH or MXD6 is preferably used.

  It is preferable to laminate an outer layer made of an impact-resistant thermoplastic resin on the surface of the multilayer film outside the gas barrier layer constituting the oxygen-absorbing multilayer film of the lid. Preferred impact-resistant thermoplastic resins include polyesters such as polyethylene terephthalate, polyamides such as nylon 6 and nylon 6,6, and polypropylene. A printing layer can be provided between the gas barrier layer and the outer layer.

  The layers constituting the oxygen-absorbing multilayer film of the lid material may be bonded using a urethane or epoxy adhesive or a polyolefin hot melt agent, and may be bonded by heat fusion without using an adhesive. You may join.

  When the interlayer strength between the sealant layer and the oxygen-absorbing resin layer of the lid material is greater than the cohesive peel strength of the inner surface layer in the barrier container, and the lid material is T-type peeled at a peeling speed of 300 mm / min in accordance with JIS K6854-3 The delamination strength between the sealant layer and the oxygen-absorbing resin layer is preferably 600 g / 15 mm or more, and more preferably 800 g / 15 mm or more. When the delamination strength is lower than 600 g / 15 mm when the T-type delamination is performed, there is a problem that delamination occurs between the sealant layer and the oxygen resin layer when the container is opened.

[JIS K6854-3] Adhesive Peeling Adhesive Strength Test Method Part 3: T-type Peeling A sample to which flexible adherends are bonded is cut into an appropriate width and length to produce a test piece. The two unbonded ends of the test piece are bent in opposite directions at right angles to the bonded joint to make a T-shaped test piece, each holding with a tensile tester grip. The tensile tester is operated at a predetermined peel strength rate and the applied force against the grip peel distance is recorded.

  In order to increase the delamination strength between the sealant layer of the lid and the oxygen-absorbing resin layer, during extrusion lamination, increase the resin temperature, decrease the take-up speed, increase the air gap, increase the cooling roll temperature, It is preferable to take measures such as preheating, increasing the wetting tension of the substrate surface, and increasing the pressure of the nip roll.

  The gas barrier molded container constituting the sealed container of the present invention has an inner surface layer made of an easily openable thermoplastic resin layer, an intermediate layer made of a barrier resin, and an outer surface layer made of a polyolefin-based thermoplastic resin. A molded article having gas barrier properties.

  A thermoplastic resin is used for the outer layer constituting the gas barrier molded container. Examples of the resin used include low-density polyethylene, linear low-density polyethylene, ultra-low-density polyethylene, various polyethylenes such as polyethylene using a metallocene catalyst, polystyrene, ethylene-vinyl acetate copolymer, ionomer, and ethylene-methyl acrylate copolymer. Polymer, ethylene-ethyl acrylate copolymer, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, ethylene-methyl methacrylate copolymer, propylene homopolymer, propylene-ethylene block copolymer, propylene -Ethylene random copolymer, various polypropylenes such as polypropylene by metallocene catalyst, polymethylpentene, thermoplastic elastomer, polyethylene terephthalate, nylon, etc., and these can be used alone or in combination. It can be.

  A thermoplastic resin is used for the gas barrier layer constituting the gas barrier molded container. Examples of the resin used for the gas barrier layer include ethylene-vinyl alcohol copolymer, nylon MXD6, and PVDC. Nylon MXD6 is particularly preferably used for heat treatment at 100 ° C. or higher such as retort or boil sterilization. A nylon MXD6 resin composition in which amorphous nylon is mixed with nylon MXD6 may be used.

The inner surface layer constituting the gas barrier molded container is composed of an easily openable thermoplastic resin layer.
The easily-openable thermoplastic resin layer is a layer that is heat-sealed with the lid material, and is a layer that breaks or peels itself when the sealed container is opened by peeling off the lid material. As a result, the oxygen-absorbing multilayer film used for the lid is prevented from being broken in the oxygen-absorbing layer, and iron powder can be prevented from remaining and adhering to the container flange surface.

  As the easily-openable thermoplastic resin layer, (a) a cohesive peel type in which the resin breaks and peels in the layer, (a) the layer peel type in which the layer has a multilayer structure and peels between the layers, C) There is an interface peeling type that peels between the layer and the adjacent layer. Among these, (a) the cohesive peeling type and (b) the delamination type are particularly preferably used because they themselves peel easily when the lid material is peeled off.

If the resin used for the easily openable thermoplastic resin layer is a thermoplastic resin, it can be used without limitation. For example, various polyethylenes such as low density polyethylene, linear low density polyethylene, ultra low density polyethylene, polyethylene by metallocene catalyst, polystyrene, ethylene-vinyl acetate copolymer, ionomer, ethylene-methyl acrylate copolymer, ethylene -Ethyl acrylate copolymer, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, ethylene-methyl methacrylate copolymer, propylene homopolymer, propylene-ethylene block copolymer, propylene-ethylene random copolymer Polymers, metallocene-catalyzed polypropylenes such as polypropylene, polymethylpentene, thermoplastic elastomers, polyethylene terephthalate, nylon, etc., can be used alone or in combination. .
In particular, in the (a) delamination type, a multilayer film composed of a combination of different types of thermoplastic resins or a combination of incompatible thermoplastic resins is preferable.

  Each layer constituting the gas barrier molded container may be bonded using a urethane-based or epoxy-based adhesive or a polyolefin-based hot melt agent, or may be bonded by a heat fusion method without using an adhesive. .

  In the sealed container of the present invention, food, medicines and the like are stored without limitation. For example, jelly with pulp, confectionery such as sheep crab, pudding, pine, oranges, peaches, apricots, none, fruits such as apples, liquid soup, seasonings such as mayonnaise, miso, grated spices, jam, cream, chocolate Pasty foods such as paste, liquid foods represented by liquid processed foods such as curry, liquid soup, boiled food, pickles, stew, raw noodles such as buckwheat, udon, ramen and boiled noodles, polished rice, conditioned rice, Pre-cooked rice such as non-washed rice, cooked cooked rice, processed rice products such as gomoku rice, red rice and rice bran, high-moisture foods represented by powder seasonings such as powdered soup and dashi nomoto Stores various articles such as solid and solution chemicals such as agricultural chemicals and insecticides, liquid and paste pharmaceuticals, lotion, cosmetic cream, cosmetic milk, hair conditioner, hair dye, shampoo, soap, detergent, etc. To do Oxygen does not enter from the outside of the container, and oxygen inside the container is absorbed by the oxygen scavenger composition, preventing oxidative corrosion of articles and maintaining good quality over a long period of time. It becomes.

  Moreover, you may heat-process the sealed container of this invention. Examples of the heat treatment include boil treatment at 80 ° C. to 100 ° C., boiling treatment, retort treatment such as semi-retort, retort, and high retort at 100 ° C. to 135 ° C. In particular, when the sealed container of the present invention using nylon MXD6 as a gas barrier layer of a gas barrier molded container is used, a heat treatment at 80 ° C. or higher, particularly preferably 100 ° C. or higher can be suitably performed, and foods and pharmaceuticals can be used for a long time. Can be stored for a period. Furthermore, the sealed container of the present invention can be heated in a microwave oven.

The present invention will be described in more detail with reference to examples. In addition, this invention is not necessarily limited to an Example.
Example 1
1000 kg of iron powder with an average particle size of 30 μm is put into a vacuum dryer equipped with a heating jacket, mixed with 140 kg at a reduced pressure of 10 mmHg at 140 ° C., sprayed with 50 kg of 50% by weight aqueous solution of calcium chloride, dried, sieved, Excluding the grains, an iron-based oxygen absorbent having an average particle diameter of 30 μm was obtained.
Next, supply iron-based oxygen absorbent and calcium oxide by side feed while extruding linear low density polyethylene (manufactured by Nippon Polychem Co., Ltd .; trade name Kernel KC580) using a twin screw extruder with vent. Polyethylene: iron-based oxygen absorbent: calcium oxide = 58: 40: 2 After being kneaded so as to have a weight ratio, extruded from a strand die, cooled, pelletized with a pelletizer, and oxygen-absorbing resin composition A Got.

Next, using a tandem extrusion laminator apparatus comprising two single-screw extruders, a T die, a cooling roll and a slitter and a winder, an unstretched polyethylene film 50 μm (manufactured by Idemitsu Petrochemical Co., Ltd .; After extruding and laminating the oxygen-absorbing resin composition A with a thickness of 30 μm as an oxygen-absorbing layer under the trade name Unilux 760C), the surface of the oxygen-absorbing layer was subjected to corona discharge treatment to obtain a laminate film.
An ethylene-vinyl alcohol copolymer film (manufactured by Kuraray Co., Ltd .; trade name EVAL EFCR, hereinafter “EVOH”) as a gas barrier layer having a thickness of 15 μm on the surface of the oxygen absorption layer and a nylon film having a thickness of 15 μm (Toyobo) The oxygen absorbing multilayer film was obtained by sequentially laminating the products manufactured by Co., Ltd. (trade name Harden N1100), and the composition of the resulting oxygen absorbing multilayer film was as follows: unstretched polyethylene 50 μm / oxygen absorbing resin composition 25 μm / EVOH 15 μm / printing. Nylon 15 μm.
The film was confirmed to have a peel strength between the sealant layer and the oxygen-absorbing resin layer of 1200 g / 15 mm when T-type peeling was performed at a peeling speed of 300 mm / min.

  Using an outer layer polypropylene / adhesive / EVOH / adhesive / polypropylene / easy-opening thermoplastic resin layer, a gas barrier sheet (manufactured by Sumitomo Bakelite Co., Ltd .; trade name Sumilite CEL-R146A) is used. Molded into a 70 cc round cup with a flange on the inside to obtain a gas barrier molded container.

The gas barrier molded container was filled with jelly-containing fruit pulp jelly, and the produced oxygen-absorbing multilayer film was used as a lid material and heat-sealed at the container flange to obtain a sealed container. The container was heated at 85 ° C. for 30 minutes, stored at 35 ° C. for 2 months, and then opened.
At the time of opening, the lid material film could be easily opened without any problem, and further, no iron powder adhered to the sealed container flange portion and the appearance was good. The color tone of jelly and mandarin orange did not change as before filling, and the flavor was also good.

Example 2
The oxygen-absorbing resin was obtained in the same manner as in Example 1 except that the linear low-density polyethylene of the oxygen-absorbing resin composition A was replaced with an ethylene-propylene random copolymer (manufactured by Chisso Corporation; trade name F8090). Composition B was obtained.
Laminated on a 40 μm unstretched polypropylene film (made by Showa Denko Plastic Products Co., Ltd .; trade name UW) to be a heat seal layer, and then an EVOH film (Kuraray Co., Ltd.) as a gas barrier layer having a thickness of 15 μm on the oxygen absorbing layer surface. Manufactured; product name EVAL EFCR) and printed nylon film with a thickness of 15 μm (manufactured by Toyobo Co., Ltd .; product name Harden N1130) were sequentially dry laminated to obtain an oxygen-absorbing multilayer film. The structure of the obtained oxygen-absorbing multilayer film is unstretched polypropylene 40 μm / oxygen-absorbing resin composition 25 μm / EVOH 15 μm / printed nylon 15 μm.
This film was confirmed to have a peel strength between the sealant layer and the oxygen-absorbing resin layer of 900 g / 15 mm when T-type peeling was performed at a peeling speed of 300 mm / min.

  Using a gas barrier sheet (made by Idemitsu Petrochemical Co., Ltd .; trade name Magic Top SE) consisting of outer layer polypropylene / adhesive / EVOH / adhesion / polypropylene / easy-opening thermoplastic resin layer, with the easy-opening thermoplastic resin layer as the inside A gas barrier molded container was obtained by molding into a 90 cc square pyramid trapezoidal cup having a flange.

A gas barrier molded container was filled with matcha-flavored pudding, and the produced oxygen-absorbing multilayer film was heat-sealed at the container flange using the lid material to obtain a sealed container. The container was heated at 110 ° C. for 30 minutes, stored at 35 ° C. for 2 months, and then opened.
At the time of opening, the lid material film could be opened without any problem, and further, no iron powder adhered to the sealed container flange portion and the appearance was good. The green tea pudding had good color and flavor.

Example 3
The gas barrier layer of the lid material used in Example 2 was changed from EVOH to alumina-deposited PET (manufactured by Toppan Printing Co., Ltd .; trade name GL-AE), unstretched polyethylene 50 μm / oxygen absorbing resin composition 25 μm / nylon 15 μm / printing. An oxygen-absorbing multilayer film composed of 12 μm alumina-deposited PET was obtained.
This film was confirmed to have a peel strength between the sealant layer and the oxygen-absorbing resin layer of 900 g / 15 mm when T-type peeling was performed at a peeling speed of 300 mm / min.

  The gas barrier layer of the gas barrier sheet used in Example 2 is made of EVOH from nylon MXD6 (Mitsubishi Gas Chemical Co., Ltd .; trade name MX Nylon K6007W) and non-crystalline nylon (Mitsui DuPont Chemicals Co., Ltd .; trade name Sheila PA). The 2: 1 blend resin composition was used and molded into a 200 cc cylindrical cup having a flange with the easy-open thermoplastic resin layer as the inside to obtain a gas barrier molded container.

The gas barrier molded container is filled with 180 g of corn soup, heat sealed using the oxygen absorbing film as a lid, sealed with heat cooking at 121 ° C. for 30 minutes, and a sealed container filled with corn soup Produced. The sealed container was stored at 35 ° C. for 2 months and then opened.
At the time of opening, the lid material film could be opened without any problem, and further, no iron powder adhered to the sealed container flange portion and the appearance was good. The color and flavor of corn soup were also good.

Claims (1)

At least a sealant layer made of a thermoplastic resin, a cover material having an oxygen absorbing film made of an iron-based oxygen absorbent-containing oxygen absorbing resin layer and a barrier layer, an inner surface layer made of an easily openable thermoplastic resin layer, and a barrier resin A barrier container having an intermediate layer and an outer surface layer made of a polyolefin-based thermoplastic resin, wherein the inner surface layer of the barrier container and the sealant layer of the lid material are joined by heat sealing at the flange portion of the barrier container. , T-type peeling at a peeling rate of 300 mm / min in accordance with JIS K6854-3, where the interlayer strength between the sealant layer and the oxygen-absorbing resin layer in the lid material is greater than the cohesive peel strength of the inner surface layer in the barrier container The delamination strength between the sealant layer and the oxygen-absorbing resin layer of the lid material is 600 g / 15 mm or more. Sealed container which is characterized.