Molded containers and packaging for containing oil and fat-containing foods

Abstract

To provide a molded container that is unlikely to get discolored and smell even when processed foods containing a large amount of fat such as curry and stew are stored for a long period of time.SOLUTION: The molded container for storing fat-containing foods that is made of a metal laminate packaging material, is formed by molding a metal laminate packaging material 10, in which a thermosetting resin layer 10a made of homopolypropylene film, a barrier layer 10c made of a metal foil and a protective resin layer 10d made of a synthetic resin film are sequentially laminated, so that the thermosetting resin layer 10a is configured to be an inner surface.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a molded container suitable for storing fat-and-oil-containing food, and a package using the molded container. In the present specification, aluminum includes pure aluminum and aluminum alloys, unless otherwise specified. Background Art

[0002] Cans and jars have long been used for long-term preservation of processed foods. However, jars are heavy and easily broken, and there is a risk of injury from cut edges of cans after opening, which causes problems in transportability and handleability. For this reason, molded containers using lightweight and flexible laminate packaging materials are widely used.

[0003] As a laminate packaging material, a metal laminate packaging material (so-called high barrier film) obtained by laminating both surfaces of a metal foil with synthetic resin films is known. Further, among metal laminate packaging materials, an aluminum laminate packaging material obtained by bonding synthetic resin films to both surfaces of an aluminum foil has a high blocking effect against light, moisture, oxygen and the like. Therefore, aluminum laminate packaging materials are widely used as a material for various molded containers (so-called high-barrier molded containers), particularly in food applications.

[0004] As a high-barrier molded container, for example, Patent Document 1 discloses a container formed by dry-laminating a polyethylene terephthalate film, an aluminum foil, a modified polypropylene film and a polypropylene film into an aluminum laminate packaging material, wherein the polypropylene film serves as the innermost surface.

[0005] High-barrier molded containers have conventionally been used for containing solid or semi-solid foods containing a large amount of moisture, such as jelly, pudding and baby food. On the other hand, foods containing a large amount of fat and oil such as curry, stew and pasta sauce (hereinafter also referred to as fat-and-oil-containing foods) are generally distributed as so-called retort foods packaged in pouch-shaped containers.

[0006] Incidentally, demand for retort foods has been increasing in recent years. This is due to significant changes in consumer lifestyles, such as the rise in dual-income and single-person households, and the emergence of increased demand for staying at home. However, retort foods in pouch containers usually need to be transferred to plates or bowls after cooking, which requires the hassle of washing dishes, and are therefore often disliked, especially by single-person households. Furthermore, with natural disasters such as earthquakes, typhoons, and floods occurring frequently worldwide these days, tableware is not always available in disaster areas or evacuation zones. In this respect, high-barrier molded containers can be used not only as cooking utensils but also as tableware, and demand for them has been steadily growing recently as a convenient way to provide retort foods. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Patent No. 2866916 [Overview of the Initiative] [Problems that the invention aims to solve]

[0008] However, when oil-containing foods such as curry and stew are stored in high-barrier molded containers for extended periods, coloring and odor components dissolved in the oil can penetrate the innermost layer of the molded container, resulting in strong discoloration and flavoring. In particular, cup-shaped and tray-shaped molded containers have their outermost layer at the curved portion greatly stretched while the innermost layer is strongly contracted, and strong discoloration can occur in these contracted areas. [Means for solving the problem]

[0009] The present invention aims to provide a high-barrier molded container using metal laminate packaging material that is less prone to discoloration and flavoring, particularly in the processed areas, even when containing oil-containing foods for extended periods.

[0010] The inventors conceived the idea that by constructing the innermost surface of a molded container with a synthetic resin film having a homogeneous and dense crystalline structure, coloring and odor components contained in the oil-containing food contents would be less likely to migrate into this inner surface. They then discovered that by selecting a homopolypropylene film as the synthetic resin film, a molded container and packaging body capable of solving the aforementioned problem could be obtained. That is, the present invention relates to the following molded container and packaging body.

[0011] 1) A molded container made of metal laminate packaging material for containing oil and fat-containing foods, having an opening and a flange portion formed in an annular shape around the periphery of the opening, wherein the metal laminate packaging material has a heat-sealable resin layer made of homopolypropylene film, a barrier layer made of metal foil, and a protective resin layer made of synthetic resin film, wherein the heat-sealable resin layer forms the innermost surface of the container and the protective resin layer forms the outermost surface of the container. Furthermore, the homopolypropylene film is a film made of polypropylene obtained by copolymerizing propylene with α-olefin. A molded container characterized by the following features.

[0012] 2) The thickness of the homopolypropylene film forming the heat-sealable resin layer is 20 to 400 μm. , 1) Molded container.

[0013] 3) The α-olefin is ethylene and / or 1-butene. A molded container of type 1) or 2).

[0014] 4) A molded container according to any of 1) to 3), wherein the α-olefin content in the homopolypropylene film is less than 10 mol%.

[0015] 5) A molded container according to any of 1) to 4), wherein the homopolypropylene film is of the unstretched type.

[0016] 6) A reinforcing layer made of polyolefin film is interposed between the heat-fusible resin layer and the barrier layer, 1)~ 5) One of the following molded containers.

[0017] 7) The reinforcing layer is a laminated film consisting of at least two polyolefin films, comprising at least a poly(propylene-ethylene) random copolymer layer and / or a polypropylene-polyethylene block copolymer layer. 6) A molded container.

[0018] 8) The polyolefin film forming the reinforcing layer contains a filler. , 6) or 7) A molded container.

[0019] 9) The filler is titanium dioxide. , 8) The molded container according to .

[0020] 10) A base layer formed by chemical conversion treatment is formed on one or both sides of the barrier layer. , any one of 1) to 9) The molded container according to any one of .

[0021] 11) The metal foil forming the barrier layer is aluminum foil. , any one of 1) to 10) The molded container according to any one of .

[0022] 12) 1) to 11) A heat-sealed package, comprising: the molded container according to any one of ; an oil- and fat-containing food; and a lid having an innermost surface formed of a heat-fusible resin, wherein a heat-sealed portion is formed between the heat-fusible resin layer of the lid and the heat-fusible resin layer forming an upper surface of a flange portion of the molded container. [Effect of the Invention]

[0023] 1) ~11) Since the molded container according to is a container molded from a predetermined metal-laminated packaging material, it has excellent blocking effects against moisture, gas, light and the like. Therefore, it is suitable for long-term storage of various foods, particularly oil- and fat-containing foods with rich flavor such as curry, stew and pasta sauce. Further, in this molded container, the heat-fusible resin layer forming the innermost surface is formed of a homogeneous, dense crystalline homopolypropylene film, and oil and fat derived from the oil- and fat-containing food is less likely to penetrate into this film. Therefore, even when the oil- and fat-containing food is stored in the molded container for a long period of time, coloring and flavor adsorption derived from the oil and fat are less likely to occur over the entire inner surface of the container. This effect is particularly remarkable in bent portions of the molded container. Thus, 1) ~11) The molded container according to has excellent coloring resistance and flavor adsorption resistance.

[0024] 6)~9)The molded container has a reinforcing layer made of polyolefin film interposed between the innermost heat-sealable resin layer and the barrier layer, resulting in good resistance to discoloration and odor transfer, as well as superior mechanical performance. Furthermore, the presence of this reinforcing layer prevents delamination on one or both sides of the barrier layer.

[0025] 7) The molded container is composed of a laminated film of two or more polyolefin films forming the reinforcing layer, and since this laminated film consists of a poly(propylene-ethylene) random copolymer layer and / or a polypropylene-polyethylene block copolymer layer, it has good resistance to discoloration and odor transfer, as well as good mechanical performance. Furthermore, its heat resistance and water resistance are also improved, so packaging using this molded container does not have defects such as delamination or peeling at the heat-sealed parts, even when heated in hot water, for example.

[0026] 10) Because the molded container has a base layer formed on one or both sides of the barrier layer by chemical treatment, when a predetermined heat-sealable resin layer or reinforcing layer is bonded to the upper surface of the barrier layer with an adhesive, or when a predetermined protective resin layer is bonded to the lower surface of the barrier layer with an adhesive, it exhibits good interlayer adhesion, resulting in good resistance to discoloration and odor transfer, as well as excellent mechanical performance. Furthermore, heat resistance and water resistance are also improved, so packaging using this molded container does not exhibit defects such as delamination or peeling at the heat-sealed parts, even when heated in hot water, for example. In addition, since the base layer itself functions as a barrier layer, packaging containing oil-containing foods in this molded container is suitable for longer-term storage.

[0027] 11) Because the barrier layer of this molded container is made of aluminum foil, it is lightweight and low-cost. Furthermore, because aluminum foil has good ductility, this molded container does not have cracks or pinholes in the aluminum foil, even when manufactured using molding methods that involve large deformations such as deep drawing or stretch molding.

[0028] 12) The packaging is designed to minimize discoloration on the innermost surface of the molded container even after long-term storage of oil-containing foods such as curry, stew, and pasta sauce, particularly in the bent areas. Furthermore, there is no lingering odor. Depending on the type of molded container, the mechanical properties such as impact resistance and durability, as well as some or all of the heat resistance, water resistance, and ease of opening are also improved. [Brief explanation of the drawing]

[0029] [Figure 1] This is a cross-sectional view of one embodiment of the metal laminate packaging material that constitutes the molded container of the present invention, where (a) shows the basic configuration and (b) shows a modified example. [Figure 2] This is a perspective view of one embodiment of the molded container of the present invention. [Figure 3] This is a partial cross-sectional view of one embodiment of the packaging body of the present invention, where (a) shows an embodiment in which an opening notch is not engraved on the upper surface of the flange portion, and (b) shows an embodiment in which an opening notch is engraved on the upper surface of the flange portion. [Modes for carrying out the invention]

[0030] Embodiments of the present invention will be described below with reference to Figures 1 to 3. However, these drawings are illustrative and do not limit the scope of the present invention.

[0031] Figure 1 is a cross-sectional view of one embodiment of a metal laminate packaging material (10) that constitutes a molded container (1) of the present invention. In the metal laminate packaging material (10) of Figure 1(a), a heat-fusible resin layer (10a), a barrier layer (10c), and a protective resin layer (10d) are laminated in this order. In the metal laminate packaging material (10) of Figure 1(b), a heat-fusible resin layer (10a), a reinforcing layer (10b), a barrier layer (10c), and a protective resin layer (10d) are laminated in this order. However, the reinforcing layer (10b) is optional and can be omitted.

[0032] Figure 2 is a perspective view of one embodiment of the molded container (1) of the present invention. This molded container (1) is made of a metal laminate packaging material (10) and comprises an upper opening (11), a periphery (12) of the opening (11), a flange portion (13) formed in an annular shape at the periphery (12), a downwardly extending cylindrical side wall (14) that is continuous with the flange portion (13) with the periphery (12) as the boundary, and the side wall (14) surrounding it. bottom It consists of a wall (15). An annular opening notch (16) is engraved on the upper surface of the flange portion (13).

[0033] Figure 3 is a cross-sectional view of one embodiment of the packaging (2) of the present invention. The packaging (2) is a heat-sealed sealed body comprising a molded container (1) of the present invention, an oil-containing food product (3) which is the contents, and a lid (4) which is a sealing means.

[0034] The heat-sealable resin layer (10a) is the layer that forms the innermost surface of the molded container (1) and is heat-sealed to the bottom surface of the lid (4), and is composed of a homopolypropylene film (A). The homopolypropylene film (A) is a film made of a homopolymer of propylene and has a relatively homogeneous and dense crystalline structure, thus exhibiting excellent oil resistance. In addition, the homopolypropylene film (A) also has good hinge properties, so even if it is deformed during the molding of the metal laminate packaging material (10), voids are less likely to form inside. For the reasons exemplified above, even if oil-containing food (3) is placed in the molded container (1), coloring and odor components derived from the oil-containing food (3) are less likely to penetrate into the heat-sealable resin layer (10a), resulting in the molded container (1) exhibiting good resistance to coloring and odor. Various known homopolypropylene films (A) can be used, for example, a film made from isotactic homopolypropylene obtained by coordination anionic polymerization of propylene in the presence of a Ziegler-type catalyst such as titanium(III) chloride-diethyl urumium chloride. Alternatively, a film made from homopolypropylene obtained by the BASE method, Anoco method, UCC method, etc., can also be used. The film formation method is not particularly limited, and various known (co)extrusion molding methods (inflation, T-die, etc.), stretching methods, lamination methods, etc., can be employed, and these methods may be combined. Furthermore, in the case of the stretching method, the homopolypropylene film (A) may be either stretched or unstretched. Selecting an unstretched type results in better color resistance and odor resistance of the molded container (1). The homopolypropylene film (A) exhibits improved color resistance and odor resistance to the molded container (1) when its crystalline structure is more homogeneous and dense. From this viewpoint, it is preferable that the homopolypropylene film (A) has a melting point of 160°C or higher and a crystalline melting energy of 65 J / g or higher. Here, "melting point" refers to the peak melting temperature (Tmp) measured by differential operation calorimetry (DSC) in accordance with JIS K7121-1987. "Crystal melting energy" refers to the peak heat of fusion (crystalline melting energy, ΔH) measured by DSC in accordance with JIS K7122-1987. If there are multiple peak values ​​for Tmp and ΔH, the maximum value of each is adopted. Preferably, the melting point and crystalline melting energy are 160-165°C and 65-80 J / g, respectively, in which case the color resistance and odor resistance to the molded container (1) are better. Furthermore, if the tensile yield stress (TYS) of the homopolypropylene film (A) is 25 MPa or higher, the molded container (1) will have good color resistance and odor resistance, as well as superior mechanical performance such as impact resistance and durability. Here, "tensile yield stress" is a measured value in accordance with JIS K7127, and is the average value of the TYS in the MD direction and the TYS in the TD direction. Such a tensile yield stress is preferably 25 to 45 MPa, more preferably 31 to 39 MPa, in which case the mechanical performance of the molded container (1) will be even better. In this case, the TYS in the MD direction is usually 34 to 40 MPa, and the TYS in the TD direction is usually 28 to 38 MPa. As the homopolypropylene film (A), a film made of polypropylene copolymerized with trace amounts of other α-olefins such as ethylene or 1-butene may be used, provided that it does not significantly impair the color resistance and odor resistance of the molded container (1). Examples of α-olefins include ethylene and / or 1-butene. The content of α-olefins in the homopolypropylene film (A) is less than 10 mol%. The thickness of the homopolypropylene film (A), i.e., the thickness of the heat-sealable resin layer (10a), is not particularly limited, but considering the moldability of the metal laminate packaging material (10), and the color resistance, odor resistance, and heat resistance of the molded container (1), it is usually 20 to 400 μm, preferably 40 to 350 μm.

[0035] An adhesive layer (101) (not shown) may optionally be provided between the heat-fusible resin layer (10a) and the reinforcing layer (10b) or barrier layer (10c). Various known adhesives can be used to form the adhesive layer (101), such as polyurethane resin adhesives, acrylic resin adhesives, epoxy resin adhesives, polyolefin resin adhesives, and elastomer adhesives, and two or more can be used in combination. Among these, polyurethane resin adhesives are preferred, and two-component curing polyether-urethane resin adhesives and / or two-component curing polyester-urethane resin adhesives are particularly suitable. By including fillers described later in the adhesive, the adhesive layer (101) can be given, for example, aesthetic appeal. In particular, by including a white pigment such as titanium dioxide, it becomes easier to detect foreign matter mixed into the inner surface of the molded container (1). Considering the balance between these effects and the adhesive strength of the adhesive layer (101), the filler content is usually 10 to 60% by weight. The thickness of the adhesive layer (101) is not particularly limited and is usually 1 to 5 μm.

[0036] The reinforcing layer (10b) is optional and consists of various known polyolefin films (B). By interposing the reinforcing layer (10b) between the heat-sealable resin layer (10a) and the metal foil layer (10c), the mechanical performance of the molded container (1) and the packaging (2) can be improved. Various known polyolefins can be used as the polyolefin constituting the polyolefin film (B), for example, polyethylene and polypropylene. Examples of polyethylene include high-density polyethylene, medium-density polyethylene, and linear low-density polyethylene. Examples of polypropylene include homopolypropylene, poly(ethylene-propylene) random copolymer, and polyethylene-polypropylene block copolymer. A film made of homopolypropylene may be the same as the homopolypropylene film (A). Both polyethylene and polypropylene may be modified with unsaturated carboxylic acids such as maleic anhydride or vinyl acetate. The means for forming the polyolefin into a film are not particularly limited and include various known (co)extrusion molding methods (inflation, T-die, etc.), stretching methods, lamination methods, etc. In the case of the stretching method, the polyolefin film (B) may be either stretched or unstretched. The polyolefin film (B) may contain various known fillers and / or elastomers. Examples of fillers include clay, silica, talc, titanium dioxide, and carbon black, and two or more may be combined. Examples of elastomers include styrene-based elastomers and / or olefin-based elastomers, and two or more may be combined. When the polyolefin film (B) is composed of at least two laminated films comprising at least a poly(propylene-ethylene) random copolymer layer and / or a polypropylene-polyethylene block copolymer layer, the moldability of the metal laminate packaging material (10) and the impact resistance of the molded container (1) are particularly good. Specifically, the number of layers of the laminated film may be 2 to 5. A concrete example of the laminated film is a two- or three-layer polyolefin film in which the poly(ethylene-propylene) random copolymer layer and the polyethylene-polypropylene block copolymer layer are combined in any order. The thickness of the polyolefin film (B), i.e., the thickness of the reinforcing layer (10b), is not particularly limited, but from the viewpoint of the moldability of the metal laminate packaging material (10), and the durability and impact resistance of the molded container (1) and packaging body (2), it is usually 20 to 300 μm, preferably 30 to 200 μm.

[0037] An adhesive layer (102) (not shown) may optionally be provided between the reinforcing layer (10b) and the barrier layer (10c). The adhesive forming the adhesive layer (102) can be the same as the adhesive forming the adhesive layer (101), and a two-component curing polyether-urethane resin adhesive and / or a two-component curing polyester-urethane resin adhesive are particularly preferred. The adhesive layer (102) may also contain the filler that can be included in the adhesive layer (101) in the amount described above. The thickness of the adhesive layer (102) is not particularly limited, and is usually about 1 to 5 μm.

[0038] The barrier layer (10c) is a layer for protecting oil-containing food products (3) from gas, water vapor, and light, and is composed of various known metal foils (C). Examples of metal foils (C) include aluminum foil, iron foil, stainless steel foil, copper foil, and nickel foil. Of these, aluminum foil is preferred in terms of light shielding, barrier function, moldability, and cost. Furthermore, because aluminum foil has good ductility, even if a metal laminate packaging material (10) made of aluminum foil is subjected to molding means involving large deformations such as deep drawing or stretch molding, defects such as cracks and pinholes are less likely to occur in the barrier layer (10c). Examples of aluminum foils include soft (O material) or hard (H18 material) pure aluminum foil or aluminum alloy foil, and Al-Fe alloy foil containing 0.7 to 1.7% iron is particularly preferred. For example, soft materials (O material) of the A1000 series or A8000 series as specified in JIS H4160 are preferred because they have excellent formability in cold forming such as deep drawing. Examples of soft materials (O material) include A8021H-O material, A8079H-O material, and A1N30-O material. The thickness of the metal foil (C), i.e., the thickness of the barrier layer (10c), is not particularly limited, but from the viewpoint of the aforementioned defects in the barrier layer (10c), and the durability and impact resistance of the molded container (1) and packaging (2), it is usually 50 to 200 μm, preferably 50 to 150 μm.

[0039] A base layer may be formed on at least one of the two surfaces of the barrier layer (10c) by chemical conversion treatment. This base layer is formed, for example, by applying a water-alcohol solution selected from the following group as the chemical conversion treatment solution to the surface of a degreased metal foil (C). (i) A water-alcohol solution containing phosphoric acid, chromic acid, and at least one compound selected from the group consisting of metal salts and nonmetal salts of fluorides. (ii) A water-alcohol solution comprising phosphoric acid, at least one resin selected from the group consisting of acrylic resins, chitosan derivative resins, and phenolic resins, and at least one compound selected from the group consisting of chromic acid and chromium(III) salts. (iii) A water-alcohol solution comprising phosphoric acid, at least one resin selected from the group consisting of acrylic resins, chitosan derivative resins, and phenolic resins, at least one compound selected from the group consisting of chromic acid and chromium(III) salts, and at least one compound selected from the group consisting of metal salts of fluorides and nonmetal salts of fluorides. The amount of chemical treatment solution used is not particularly limited, and the amount of chromium deposited on one side of the barrier layer (10c) is typically 0.1 to 50 mg / m². 2 Preferably 2-20 mg / m² 2 Any range within that range is acceptable.

[0040] An adhesive layer (103) (not shown) may optionally be provided between the barrier layer (10c) and the protective resin layer (10d). The adhesive forming the adhesive layer (103) can be the same as the adhesive forming the adhesive layer (101), and a two-component curing polyether-urethane resin adhesive and / or a two-component curing polyester-urethane resin adhesive are particularly preferred. The adhesive layer (103) may also contain the filler that can be included in the adhesive layer (101) in the amount described above. The thickness of the adhesive layer (103) is not particularly limited, and is usually about 1 to 5 μm.

[0041] The protective resin layer (10d) is a layer that forms the outermost surface of the molded container (1), ensures the strength of the molded container (1) and the packaging (2), and protects the oil-containing food (3) contained in the packaging (2) from the outside. It is composed of various known synthetic resin films (D). Examples of synthetic resins that make up the synthetic resin film (D) include polyolefins, polyethylene, polyamides, and other synthetic resins. Examples of polyolefins include polyethylene and polypropylene. Examples of polyethylene include high-density polyethylene, medium-density polyethylene, and linear low-density polyethylene. Examples of polypropylene include homopolypropylene, poly(ethylene-propylene) random copolymer, and polyethylene-polypropylene block copolymer. A film made of homopolypropylene may be the same as the homopolypropylene film (A). Both polyethylene and polypropylene may be modified with an acid such as maleic anhydride or vinyl acetate. Examples of polyesters include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, and polybutylene naphthalate. Examples of polyamides include nylon 6. Examples of other synthetic resins include polystyrene, polyvinyl chloride, and polycarbonate. The means of forming the synthetic resin film (D) are not particularly limited and include various known (co)extrusion molding methods (inflation, T-die, etc.), stretching methods, lamination methods, etc. In the case of the stretching method, the synthetic resin film (D) may be either stretched or unstretched. The synthetic resin film (D) may contain the filler and / or the elastomer. If the synthetic resin film (D) is composed of at least two laminated films comprising at least a poly(propylene-ethylene) random copolymer layer and / or a polypropylene-polyethylene block copolymer layer, the moldability of the metal laminate packaging material (10) and the weather resistance of the molded container (1) will be improved. Specifically, the number of layers of the laminated film may be 2 to 5. A specific example of the laminated film is a two- or three-layer polyolefin film in which the poly(ethylene-propylene) random copolymer layer and the polyethylene-polypropylene block copolymer layer are combined in any order. A layer made of an overcoat agent consisting of an epoxy resin, chlorinated polyolefin resin, nitrated cotton, acrylic resin, vinyl chloride-vinyl acetate copolymer, or other thermosetting crosslinkable resin may be formed on the surface of the synthetic resin film (D). The thickness of the synthetic resin film (D), i.e., the thickness of the protective resin layer (10d), is not particularly limited, but considering the durability, impact resistance, and weather resistance of the molded container (1) and packaging (2), it is usually 15 to 50 μm, preferably 15 to 40 μm.

[0042] The metal laminate packaging material (10) can be manufactured by various known methods. Examples of such methods include dry lamination, extrusion lamination, and heat lamination. In the case of dry lamination, the aforementioned adhesive can be used.

[0043] Preferred embodiments of the metal laminate packaging material (10) are listed below. First embodiment: The heat-fusible resin layer (10a) is made of an unstretched homopolypropylene film (thickness 20-400 μm, preferably 40-350 μm), the barrier layer (10c) is made of aluminum foil (particularly JIS H4160 A8079H-O material or A8021H-O material) (thickness 50-200 μm, preferably 50-150 μm) with a base layer formed on at least one side with the chemical conversion treatment liquid, and the protective resin layer (10d) is made of two or three layers of polyolefin film (total thickness 15-50 μm, preferably 15-40 μm) in which a poly(ethylene-propylene) random copolymer layer and a polyethylene-polypropylene block copolymer layer are combined in any order. Second embodiment: An embodiment in which, in the first embodiment, a reinforcing layer (10b) consisting of two or three films (total thickness 20 to 300 μm, preferably 30 to 200 μm) is interposed between the heat-fusible resin layer (10a) and the protective resin layer (10d), wherein a poly(ethylene-propylene) random copolymer layer and a polyethylene-polypropylene block copolymer layer are combined in any order.

[0044] The molded container (1) of the present invention is obtained by processing a metal laminate packaging material (10) using various known molding methods. Examples of molding methods include press molding such as stretch molding and deep drawing. In the case of deep drawing, first, the metal laminate packaging material (10), cut to a predetermined size, is set on the upper surface of a fixed female die from the protective resin layer (10d) side. Next, a movable male die, which is the same shape as the housing part of the molded container (1), is lowered from the heat-fusible resin layer (10a) side of the metal laminate packaging material (10) to perform deep drawing. Then the movable male die is raised and the molded container (1) is removed from the fixed female die. The flange portion (13) of the molded container (1) may be trimmed as needed to remove unnecessary parts. In this way, a molded container (1) of the desired shape is obtained.

[0045] The shape of the molded container (1) is not particularly limited and may be set as appropriate according to the application and design. For example, the opening (11) may be circular, elliptical, polygonal, etc. The flange portion (13) may be annular, elliptical annular, polygonal annular, etc. The side wall (14) may be cylindrical, polygonal prism, or tapered, and may have a step in the middle or be embossed. The bottom wall (15) may be circular, elliptical, polygonal, etc., similar to the opening (11). The overall shape of the molded container (1) is not limited to a cup shape as shown in Figure 2, but may be, for example, a tray shape. The dimensions of the molded container (1) are also not particularly limited, and in the case of a cup-shaped molded container (1) as shown in Figure 2, for example, the width of the flange portion (13) is about 5 to 10 mm, and the ratio (D / H) of the diameter (R) of the opening (11) to the depth (D) of the container is about 2.

[0046] The method for forming the opening notch (16) is not particularly limited. For example, an annular notch-forming blade (not shown) heated to about 200°C is pressed against the upper surface of the flange portion (13) to allow its tip to penetrate the heat-fusible resin layer (10a), and then it is pulled up to leave an opening notch (16) with the same transverse shape as the blade tip. Examples of notch-forming blades include those described in Japanese Patent Application Publication No. 2017-30087 and Japanese Utility Model Publication No. 7-20004. The position of the opening notch (16) is also not particularly limited. If the width of the flange portion (13) is 5 to 10 mm, it can be, for example, 2 to 4 mm from the periphery (12) of the opening (11).

[0047] The packaging body (2) of the present invention is obtained by placing oil-containing food (3) in a molded container (1), and then heat-sealing the lower surface of the lid (4) to the upper surface of the flange portion (13).

[0048] The packaging (2) is opened by interfacial delamination that occurs between the heat-sealable resin layer (40d) on the underside of the lid (4) and the heat-sealable resin layer (10a) of the molded container (1). Figure 3(a) is a partial cross-sectional view of the packaging body (2) of the present invention, in which an annular heat-sealed portion (51) is formed between the lower surface of the lid (4) and the upper surface of the flange portion (13) of the molded container (1) by the heat-sealing process. On the other hand, an annular unheat-sealed portion (52) is formed on the outer circumference side of the heat-sealed portion (51) (opposite the opening (11)), which can be used as an opening notch. The width of the unheat-sealed portion (52) is not particularly limited, but is usually 1 to 3 mm when the width of the flange portion (13) is 5 to 10 mm. In this case, the width of the heat-sealed portion (51) is usually 7 to 9 mm. In Figure 3(b), the packaging (2) has an opening notch (16) located a short distance from the opening (11) of the molded container (1). The position of the opening notch (16) is not particularly limited; for example, if the width of the flange portion (13) is 5 to 10 mm, it can be located 2 to 4 mm from the periphery (12) of the opening (11). In this case, the width of the heat-sealed portion (51) is usually 6 to 8 mm. The cross-section of the opening notch (16) is usually roughly V-shaped, but it may also be roughly U-shaped, for example. If the opening notch (16) is roughly V-shaped, the angle formed by the two hypotenuses is not particularly limited, and is usually 5° to 25°. The position of the tip of the opening notch (16) is not particularly limited, and it is sufficient if it reaches the heat-sealable resin layer (10a) or the reinforcing layer (10b). When the tip reaches the vicinity of the barrier layer (10c) (not shown), even if the peeling of the lid (4) progresses due to cohesive failure of the heat-fusible resin layer (10a) or the reinforcing layer (10b), this progress will always stop at the position of the opening notch (16), making it easier to open.

[0049] Examples of oil-containing foods (3) include semi-solid or solid processed foods containing animal or vegetable oils. Specifically, these include flavored foods such as curry roux, pasta sauce, stew, demi-glace sauce, processed fish products (oil-packed or boiled tuna, mackerel, saury, and sardines, etc.), peanut butter, and processed meat products (corned beef, Spam, etc.).

[0050] The lid (4) is a sealing means for the oil-containing food (3) contained in the molded container (1), and is made of laminate packaging material (40). In Figures 3(a) and (b), the laminate packaging material (40) is formed by laminating a predetermined protective resin layer (40a), a metal foil layer (40b), a reinforcing layer (40c), and a heat-sealable resin layer (40d) in this order. However, the metal foil layer (40b) and the reinforcing layer (40c) are both optional and can be omitted. The protective resin layer (40a) is the outermost layer of the lid (4) and is composed of various known synthetic resin films. The synthetic resin films listed as synthetic resin film (D) can be used, and films selected from stretched polypropylene film, stretched polyethylene terephthalate film, and stretched polyamide film are preferred. The protective resin layer (40a) may also be a multilayer formed by combining one or more identical or different synthetic resin films in any order. Furthermore, the protective resin layer (40a) may be composed of the aforementioned overcoat agent. The thickness of the protective resin layer (40a) is not particularly limited, but is usually 1 to 30 μm from the viewpoint of durability, impact resistance, and weather resistance of the packaging (2). An optional metal foil layer (40b) functions as a barrier layer to protect the oil-containing food (3) contained in the molded container (1) from gas, water vapor, light, etc. The same metal foil as metal foil (C) can be used, and aluminum foil is preferred. Examples of aluminum foil include pure aluminum foil or aluminum alloy foil of O material or H18 material. A base layer of the chemical conversion treatment solution may be formed on at least one of the two surfaces of the metal foil layer (40b). The thickness of the metal foil layer (40b) is not particularly limited, and is usually 5 to 40 μm. An optional reinforcing layer (40c) is composed of various known synthetic resin films and can be interposed between the metal foil layer (40b) and the heat-sealable resin layer (40d) to improve the strength of the lid (4). Examples of synthetic resin films include polyolefin film (B), as well as the aforementioned polyester film and polyamide film. The reinforcing layer (40c) may be a composite film of two or three or more synthetic resin films. The thickness of the reinforcing layer (40c) is not particularly limited and is usually 5 to 30 μm. The heat-sealable resin layer (40d) is a layer heat-sealed to the heat-sealable resin layer (10a) that constitutes the upper surface of the flange portion (13) of the molded container (1), and is composed of various known thermoplastic resin films. Specifically, examples include polyethylene film and polypropylene film as listed as polyolefin film (B), as well as polyvinyl alcohol film, ionomer resin film, and acrylic copolymer resin film. The thermoplastic resin film may contain the filler and / or elastomer. The heat-sealable resin layer (40c) may be a multilayer formed by combining one or more identical or different thermoplastic resin films in any order. The thickness of the heat-sealable resin layer (40d) is not particularly limited and is usually 10 to 100 μm. The laminated packaging material (40) can be manufactured by, for example, dry lamination, extrusion lamination, and heat lamination. In the case of dry lamination, the aforementioned adhesive can be used as an interlayer adhesive.

[0051] The lid (4) is made by processing laminate packaging material (40) into a desired shape. The shape of the lid (4) is not particularly limited; for example, it may be the same shape as or similar to the flange portion (13) of the molded container (1). The lid (4) may optionally be provided with an opening tab, and its size and shape are not particularly limited. Examples of shapes include semicircles, triangles, and squares. The opening tab may be part of the laminate packaging material (40) that makes up the lid (4). A separately manufactured tab may be attached to a part of the outer edge of the lid (4).

[0052] The manufacturing method for the packaging (2) is not particularly limited, and various known methods can be used. Taking the molded container (1) in Figure 2 as an example, after placing a predetermined amount of oil-containing food (3) into the molded container (1), a lid (4) of a predetermined shape is placed on the upper surface of the flange portion (13) from the heat-sealable resin layer (40d) side, and an annular heat sealer heated to a predetermined temperature is pressed against the predetermined position at a predetermined pressure for a predetermined time, thereby heat-sealing the heat-sealable resin layer (40d) forming the lower surface of the lid (4) and the heat-sealable resin layer (10a) forming the upper surface of the flange portion (13) of the molded container (1), thereby obtaining the packaging (2). The edges of the lid (4) may be trimmed as needed. In both Figures 3(a) and 3(b), the packaging (2) has a common annular heat-sealed portion (51) extending circumferentially around the flange portion (13) between the lower surface of the lid (4) and the upper surface of the flange portion (13). However, in the case of the packaging (2) in Figure 3(a), an unheat-sealed portion (52) of a predetermined width is formed on the outside of the heat-sealed portion (51), which can be used as an opening notch. In the case of the packaging (2) in Figure 3(b), an opening notch (16) of a predetermined shape is formed on the inside of the heat-sealed portion (51), which can be used as an opening notch.

[0053] The packaging (2) serves as a storage container, cooking utensil, and tableware, and therefore has the convenience of allowing the oil-containing food (3) to be heated, opened, and then eaten directly. [Examples]

[0054] The present invention will be further described below through examples and comparative examples, but the scope of the invention will not be limited by them.

[0055] The abbreviations used in this example have the following meanings: Tmp (°C): Melting point (JIS K7121-1987) ΔH (J / g): Melting energy of crystals (JIS K7122-1987) TYS (MPa): Tensile yield stress (JIS K7127) HPP1-3: Homopolypropylene rPP: Poly(ethylene-propylene) random copolymer bPP: Poly(ethylene-propylene) block copolymer LLDPE: Linear low-density polyethylene PET: Polyethylene terephthalate PU adhesive: Two-component curing polyester-polyurethane adhesive

[0056] The melting point (Tmp °C) and crystalline melting energy (ΔH J / g) were measured under the following conditions. • Measuring device: Differential scanning calorimetry machine "DSC-60A" manufactured by Shimadzu Corporation • Sample amount: 5mg ·Measurement temperature: 23℃~210℃ • Heating rate: 10°C / min

[0057] The tensile yield stress (TYS) was measured using Tensilon RTG-1210 manufactured by A&D Co., Ltd.

[0058] Table 1 shows the melting points, crystalline melting energy, and tensile yield stress of HPP1, HPP2, HPP3, rPP, bPP, and LLDPE.

[0059] [Table 1]

[0060] 1. Preparation of aluminum laminate packaging Manufacturing Example 1 A 120 μm thick aluminum foil (A8079H-O material) was treated on both sides with a chemical conversion solution consisting of phosphoric acid, acrylic resin, chromium(III) salt compound, water, and alcohol to produce treated aluminum foil with a base layer. The amount of chromium deposited on each side was 10 mg / m². 2Next, a PU adhesive was applied to one side of the treated aluminum foil to a dry film thickness of 3 μm, and a film made of HPP1 (300 μm thick, manufactured by the T-die method) was laminated to it. Next, a PU adhesive was applied to the other side of the treated aluminum foil to a dry film thickness of 3 μm, and a laminate was fabricated by laminating a 30 μm thick unstretched three-layer co-extruded polyolefin film consisting of a 4.5 μm thick rPP layer, a 21 μm thick bPP layer, and a 4.5 μm thick rPP layer. Next, this laminate was aged at 40°C for 8 days to produce aluminum laminate packaging material A.

[0061] Manufacturing Examples 2-3 Aluminum laminate packaging materials B and C were prepared in the same manner as in Manufacturing Example 1, except that a film made of HPP2 (300 μm thick, manufactured by the T-die method) or a film made of HPP3 (300 μm thick, manufactured by the T-die method) was used instead of a film made of HPP1.

[0062] Manufacturing Example 4 In the first example, a PU adhesive was applied to one side of the treated aluminum foil to a dry thickness of 3 μm, and a 30 μm thick film made of rPP was laminated to it. Next, a PU adhesive was applied to the surface of this rPP film to a dry thickness of 3 μm, and an HPP1 film was laminated to it. Then, a PU adhesive was applied to the other side of the treated aluminum foil to a dry thickness of 3 μm, and the three-layer co-extruded polyolefin film from the first example was laminated to it to create a laminate. Next, this laminate was aged under the same conditions as in the first example to produce aluminum laminate packaging material D.

[0063] Manufacturing Examples 5-6 Aluminum laminate packaging materials E and F were prepared in the same manner as in Manufacturing Example 4, except that HPP2 film or HPP3 film was used instead of HPP1 film.

[0064] Manufacturing example 7 In the processed aluminum foil of Manufacturing Example 1, a PU adhesive was applied to one side to a dry film thickness of 3 μm, and a two-layer co-extruded polyolefin film with a total thickness of 175 μm, consisting of a 150 μm thick bPP layer and a 25 μm thick rPP layer, was laminated to it as a reinforcing layer. Next, a PU adhesive was applied to this two-layer co-extruded polyolefin film to a dry film thickness of 3 μm, and an HPP1 film was laminated to it. Next, a PU adhesive was applied to the other side of the processed aluminum foil to a dry film thickness of 3 μm, and a three-layer co-extruded polyolefin film from Manufacturing Example 1 was laminated to it to create a laminate. Next, this laminate was aged under the same conditions as in Manufacturing Example 1 to produce aluminum laminate packaging material G.

[0065] Manufacturing examples 8-9 In manufacturing example 7, aluminum laminate packaging materials H and I were prepared in the same manner, except that HPP2 film or HPP3 film was used instead of HPP1 film.

[0066] Comparative Manufacturing Example 1 In the first example, a PU adhesive was applied to one side of the treated aluminum foil to a dry thickness of 3 μm, and a 30 μm thick rPP film from the fourth example was laminated to it as a reinforcing layer. Next, a PU adhesive was applied to the other side of the treated aluminum foil to a dry thickness of 3 μm, and a three-layer co-extruded polyolefin film from the fourth example was laminated to it to create a laminate. Finally, the laminate was aged under the same conditions as in the first example to produce aluminum laminate packaging material J.

[0067] Comparative Manufacturing Example 2 In the first example, a PU adhesive was applied to one side of the treated aluminum foil to a dry thickness of 3 μm, and a two-layer co-extruded polyolefin film from the first example was laminated to it as a reinforcing layer. Next, a PU adhesive was applied to the other side of the treated aluminum foil to a dry thickness of 3 μm, and a three-layer co-extruded polyolefin film from the first example was laminated to it to create a laminate. This laminate was then aged under the same conditions as in the first example to produce aluminum laminate packaging material K.

[0068] Comparative Manufacturing Example 3 In the first example, a PU adhesive was applied to one side of the treated aluminum foil to a dry thickness of 3 μm, and a 50 μm thick film made of LLDPE was laminated to it as a reinforcing layer. Next, a PU adhesive was applied to the other side of the treated aluminum foil to a dry thickness of 3 μm, and a laminate was fabricated by laminating it with the three-layer co-extruded polyolefin film from the first example. This laminate was then aged under the same conditions as in the first example to produce aluminum laminate packaging material L.

[0069] 2. Manufacturing of molded containers Example 1 An aluminum laminate packaging material A was set in a commercially available press die machine, and after deep drawing and trimming, a cup-shaped molded container A, as shown in Figure 2, was produced. The molded container A had an outer flange diameter of 86 mm, a flange width of 10 mm, an opening diameter of 66 mm, a height of 30 mm, and a base diameter of 56 mm.

[0070] Examples 2-6 In Example 1, molded containers B to F were produced in the same manner as molded container A, except that aluminum laminate packaging materials B to F were used instead of aluminum laminate packaging material A.

[0071] Example 7 In Example 1, a molded container of the same dimensions as molded container A was manufactured in the same manner, except that aluminum laminate packaging material G was used instead of aluminum laminate packaging material A. Next, molded container G was manufactured by pressing an annular notch forming blade heated to 200°C against the upper surface of the flange portion of this molded container with a pressure of 120 kgf for 2 seconds, thereby creating an annular opening notch with a substantially V-shaped cross-section at a position 2 mm away from the periphery of the opening. The depth of the notch was 110 μm, and it was considered that its tip reached the bPP film layer forming the reinforcing layer, as shown in Figure 3(b).

[0072] Examples 8-9 In Example 7, molded containers H and I were manufactured in the same manner as in Example 7, except that aluminum laminate packaging material H or I was used instead of aluminum laminate packaging material G. The dimensions of each were the same as those of molded container A, and the shape and dimensions of the opening notches formed on the upper surface of the flange portion of each were also the same as those of molded container A.

[0073] Comparative Examples 1-3 In Example 1, molded containers J, K, and L were prepared in the same manner as in Example 1, except that aluminum laminate packaging material J, K, or L was used instead of aluminum laminate packaging material A.

[0074] Table 2 shows the layer structure of molded containers A to L.

[0075] [Table 2]

[0076] 3. Making the lid Manufacturing Example 10 A treated aluminum foil was prepared by chemically treating both sides of a 12 μm thick aluminum foil (A8021-H18 material) with the coating solution from Manufacturing Example 1 to form a base layer. The amount of chromium deposited on each side was 10 mg / m². 2 Next, a PU adhesive was applied to one side of the treated aluminum foil to a dry film thickness of 3 μm, and a 25 μm thick biaxially oriented PET film was laminated to it. Next, a PU adhesive was applied to the other side of the treated aluminum foil to a dry film thickness of 3 μm, and a 50 μm thick LLDPE film was laminated to it as a heat-sealable resin to create a laminate. Next, the laminate was aged at 40°C for 8 days to create a laminated packaging material. Next, the laminated packaging material was cut into a 120 mm x 120 mm square to create lid A.

[0077] Manufacturing Example 11 In manufacturing example 10, a PU adhesive was applied to one side of the treated aluminum foil to a dry thickness of 3 μm, and a 25 μm thick biaxially oriented PET film was laminated as a protective resin layer. Next, a PU adhesive was applied to the other side of the treated aluminum foil to a dry thickness of 3 μm, and a 12 μm thick biaxially oriented PET film was laminated as a reinforcing layer. Then, a PU adhesive was applied to the reinforcing layer biaxially oriented PET film to a dry thickness of 3 μm, and a 50 μm thick LLDPE film was laminated as a heat-sealable resin layer to create a laminate. Next, a laminated packaging material was produced by aging the laminate under the same conditions as in manufacturing example 10. Subsequently, the laminated packaging material was cut into a 120 mm x 120 mm square to create lid B.

[0078] 4. Preparation of packaging Example 10 Two molded containers A were prepared. In one molded container A, 20g of commercially available retort curry roux (House Foods Corporation's Pro Quality Beef Curry (registered trademark), medium spicy) with the ingredients removed was placed, and lid A was placed on the flange. Next, an annular sealer (outer diameter 84mmφ, inner diameter 72mmφ, width 6mm) heated to 190°C was pressed onto the flange at 0.2MPa for 2 seconds, with the center of its opening aligned perpendicularly to the center of the opening of molded container A, thereby creating a package A containing curry roux. In the other molded container A, 20ml of water was placed, and lid A was heat-sealed onto the flange using the same method and conditions to create a package A containing water. In each package A, a 6mm wide band-shaped area extending circumferentially on the inside of the upper surface of the flange constituted the heat-sealed area, and the 1mm wide unheat-sealed area on the outside was used as an opening trigger. Furthermore, a 3mm wide unheat-fused area was formed on the inner side of the upper surface of the flange.

[0079] Examples 11-15 For molded containers B to F, curry roux-filled packages B to F and water-filled packages B to F were manufactured in the same manner as in Example 10. Each package had the same dimensions and number of heat-sealed and unheat-sealed sections as package A.

[0080] Example 16 Two molded containers G were prepared. 20g of the retort curry roux (without the ingredients) was placed in one molded container G, and a lid B was placed on the flange. Next, a 190°C annular sealer (outer diameter 86mmφ, inner diameter 72mmφ, width 7mm) was pressed onto the flange at 0.2MPa for 2 seconds, with its opening center aligned perpendicularly to the opening center of the molded container G, thereby creating a curry roux-filled package G. 20ml of water was placed in the other molded container G, and a water-filled package G was created by heat-sealing the lid B to its flange using the same method and conditions. In both package Gs, a 7mm wide band-shaped area extending circumferentially on the outer surface of the flange constituted a heat-sealed area, and there were no unheat-sealed areas on the outside. Additionally, a 3mm wide unheat-sealed area was formed on the inner side of the flange's upper surface, and an opening notch was formed in this unheat-sealed area.

[0081] Examples 17 and 18 Similarly to Example 16, molded containers H and I were used to produce curry roux-filled packages H and I and water-filled packages H and I. Each package had the same dimensions and number of heat-sealed and unheat-sealed sections as package G.

[0082] Comparative Examples 4-6 For molded containers J to L, curry roux-filled packages J to L and water-filled packages J to L were manufactured using lid A in the same manner as in Example 10. Each package had the same dimensions and number of heat-sealed and unheat-sealed sections as package A.

[0083] 5. Evaluation of the packaging 5-1. Easy to open, color-resistant and odor-resistant. After leaving curry roux package A at room temperature for four weeks, it was placed in a commercially available tensile testing machine at a 45° angle, and the strength when the lid A was pulled upward was measured, which was approximately 20N. Next, the curry roux was discarded from the opened molded container A, the inside was washed, and then wiped with a cloth, and the side walls and bottomThe coloring of the walls and corners, and the residual aroma inside the molded container A were evaluated sensorily according to the following criteria. The same sensory evaluation was performed on curry roux-containing packages B to L. The results are shown in Table 3.

[0084] ○: No discoloration or lingering fragrance was observed on the inside of the container. △: Slight discoloration was observed only in the corners of the inner surface of the container. No lingering fragrance was detected. ×: on the inner surface of the container bottom Strong discoloration was observed on the walls and corners. A lingering odor was also detected.

[0085] [Table 3]

[0086] 5-2. Presence or absence of defects in the heat-fused joint during heat treatment. After heat treatment of water-filled package A in a retort kettle (125°C, 20 minutes), the heat-sealed area was visually inspected from the side of the flange, and no defects such as delamination or peeling were observed. The same evaluation was performed on water-filled packages B to L, and no defects were found there either.

[0087] As shown in Table 3, in all of the example packaging A to I, the innermost surface of the molded container was formed of homopolypropylene film, resulting in good resistance to discoloration and odor transfer, and the opening strength was also at an acceptable level. On the other hand, in all of the comparative packaging J to L, the innermost surface of the molded container was formed of polyolefin rather than homopolypropylene, so although the opening strength was not a problem, the resistance to discoloration and odor transfer was poor. [Industrial applicability]

[0088] The molded container of the present invention is suitable for the long-term storage of oil-containing foods such as curry, stew, and pasta sauce. [Explanation of Symbols]

[0089] (10) Metal laminate packaging, (10a) Heat-sealable resin layer, (10b) Reinforcement layer, (10c) Barrier layer, (10d) Protective resin layer, (A) Homopolypropylene film, (B) Polyolefin film, (C) Metal foil, (D) Synthetic resin film, (1) Molded container, (11) Opening, (12) Periphery, (13) Flange, (14) Side wall, (15) Bottom wall, (16) Opening notch, (2) Packaging body, (3) Oil-containing food, (4) Lid, (40) Laminate packaging, (40a) Protective resin layer, (40b) Metal foil layer, (40c) Reinforcement layer, (40d) Heat-sealable resin layer, (51) Heat-sealed part, (52) Unheat-sealed part

Claims

1. A press-formed container made of metal laminate packaging material for containing oil and fat-containing foods, It has an opening and a flange portion formed in an annular shape around the periphery of the opening. The aforementioned metal laminate packaging material has a heat-sealable resin layer made of polypropylene film, a barrier layer made of metal foil, and a protective resin layer made of synthetic resin film. The heat-sealable resin layer forms the innermost surface of the container, and the protective resin layer forms the outermost surface of the container. The aforementioned polypropylene film is a single-layer film made of polypropylene copolymerized with a small amount of α-olefin. The α-olefin content in the polypropylene film is less than 10 mol%, The thickness of the polypropylene film is 300 to 400 μm. The synthetic resin film forming the protective resin layer is characterized by being a three-layer film in which a poly(ethylene-propylene) random copolymer layer, a poly(ethylene-propylene) block copolymer layer, and a poly(ethylene-propylene) random copolymer layer are laminated in this order. Press-formed container.

2. The press-molded container according to claim 1, wherein the α-olefin is ethylene and / or 1-butene.

3. The press-molded container according to claim 1 or 2, wherein the polypropylene film is of the unstretched type.

4. A press-molded container according to any one of claims 1 to 3, wherein a reinforcing layer made of a polyolefin film is interposed between the heat-fusible resin layer and the barrier layer.

5. The press-molded container according to claim 4, wherein the polyolefin film forming the reinforcing layer is a laminated film of at least two layers, comprising at least a poly(propylene-ethylene) random copolymer layer and / or a polypropylene-polyethylene block copolymer layer.

6. The press-molded container according to claim 4 or 5, wherein the polyolefin film forming the reinforcing layer contains a filler.

7. The press-molded container according to claim 6, wherein the filler is titanium dioxide.

8. A press-molded container according to any one of claims 1 to 7, wherein a base layer formed by chemical conversion treatment is formed on one or both sides of the barrier layer.

9. A press-formed container according to any one of claims 1 to 8, wherein the metal foil forming the barrier layer is aluminum foil.

10. A heat-sealed package comprising a press-molded container according to any one of claims 1 to 9, an oil-containing food product, and a lid whose innermost surface is formed of a heat-sealable resin, A heat-sealed portion is formed between the heat-sealable resin layer of the lid and the heat-sealable resin layer forming the upper surface of the flange portion of the molded container. packaging.

Images