Molded container and package

Abstract

The present invention provides a molded container obtained by cold-forming a metal laminate packaging material, which makes it possible to reliably avoid color transfer and odor transfer to an innermost surface when oil-and-fat-containing foodstuff or the like is accommodated in the molded container for long-term storage.　A molded container 1 is obtained by cold-forming a metal laminate packaging material 10, and has: a flat bottom wall part 11 having a circular or oval planar shape; a peripheral wall part 12 extending upward from the peripheral edge of the bottom wall part 11 and having a horizontal cross-sectional shape similar to the planar shape of the bottom wall part 11; an opening 13 defined by an upper edge of the peripheral wall part 12; and an annular flange part 14 extending outward from the upper edge of the peripheral wall part 12. The metal laminate packaging material 10 has a sealant layer 10a formed from a homopolypropylene film having a thickness of 150 μm to 400 μm, a barrier layer 10b formed from a metal foil, and a protective resin layer 10c formed from a plastic film. A curved wall part 121 having a vertical cross section curved so that the outer-surface side is convex is provided in a lower portion of the peripheral wall part 12. The radius of curvature R1 on the inner side in a vertical section of the curved wall part 121 is 8 mm to 24 mm.

Description

Formed container and package

[0001] This invention relates to a formed container obtained by cold forming a metal laminate packaging material, and particularly to a formed container suitable for packaging foods containing fats and oils or pet foods for pet animals, and a package using the formed container. In this specification, "aluminum" includes pure aluminum and aluminum alloys unless otherwise specified.

[0002] As a packaging material for processed foods and the like, formed containers obtained by cold forming a metal laminate packaging material into a cup shape or a tray shape are known. A metal laminate packaging material is formed by laminating synthetic resin layers on both sides of a metal foil such as an aluminum foil, and is lightweight and excellent in blocking effects of light, moisture, oxygen, and the like. Therefore, a package obtained by hermetically packaging processed foods and the like using a formed container constituted by a metal laminate packaging material is lightweight, excellent in handling properties, and excellent in long-term storage properties of the contents.

[0003] As formed containers, for example, Patent Document 1 discloses a high-barrier formed container obtained by dry laminating a polyethylene terephthalate film, an aluminum foil, a modified polypropylene film, and a polypropylene film and forming the aluminum laminate packaging material such that the polypropylene film is on the innermost surface. Further, Patent Document 2 discloses a food packaging container obtained by forming a laminated sheet in which a synthetic resin layer, an aluminum foil, and a protective film layer are sequentially laminated such that the synthetic resin layer is on the innermost surface, and constituting the synthetic resin layer with a synthetic resin film such as polypropylene, polyethylene, polyester, polyvinyl chloride, polycarbonate, or polystyrene.

[0004] The molded containers described above have traditionally been used relatively often to package foods with high moisture content, such as jelly, pudding, and baby food. On the other hand, foods with high fat content, such as curry, stew, and pasta sauce (hereinafter also referred to as fat-containing foods), are generally distributed as so-called retort foods, packaged in pouches or other bag-like containers. However, retort foods in bag-like containers usually need to be transferred to a plate, bowl, or other tableware after cooking. In this respect, molded containers can be used directly as tableware, and therefore, demand for them as a packaging method for retort foods is growing.

[0005] However, when oil-containing foods such as curry and stew are stored in 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.

[0006] As a means of solving the above problems, Patent Document 3 discloses a molded container for containing oil and fat, which is made by molding a metal laminate packaging material, and whose innermost surface is made of homopolypropylene film.

[0007] Patent No. 2866916 JP 2-167744 JP 2021-59387

[0008] According to the molded container of Patent Document 3, the homopolypropylene film constituting the innermost surface has a homogeneous and dense crystalline structure, making it difficult for coloring and odor components contained in the oil-containing food contents to migrate to the interior. Therefore, even when oil-containing food is stored in the molded container for a long period of time, discoloration and odor transfer to the innermost surface of the molded container are reduced. However, there is still concern that discoloration and odor transfer to areas such as the boundary between the bottom wall and the peripheral wall may not be sufficiently suppressed. Furthermore, the above-mentioned problems may also occur when the contents of the molded container are pet feed containing oils.

[0009] The objective of this invention is to provide a molded container made by cold forming a metal laminate packaging material that can reliably prevent discoloration and odor transfer to the innermost surface when storing foods containing oils and fats for a long period of time.

[0010] This invention relates to a molded container and packaging body, comprising the following embodiments.

[0011] 1) A molded container for containing food containing oil or fat, or pet feed containing oil, which is made by cold forming a metal laminate packaging material, comprising: a flat bottom wall having a circular or oval planar shape; a peripheral wall extending upward from the periphery of the bottom wall and having a circular or oval horizontal cross-sectional shape similar to the planar shape of the bottom wall; an opening defined by the upper edge of the peripheral wall; and an annular flange extending outward from the upper edge of the peripheral wall on the opposite side of the opening; wherein the metal laminate packaging material comprises a sealant layer made of a heat-sealable resin film and constituting the innermost surface of the molded container; a barrier layer made of metal foil; and a protective resin layer made of a synthetic resin film and constituting the outermost surface of the molded container; wherein the heat-sealable resin film constituting the sealant layer is made of a homopolypropylene film having a thickness of 150 to 400 μm. A molded container wherein at least the lower part of the peripheral wall portion connected to the bottom wall portion is composed of a curved wall portion having a vertical cross-section that is curved such that the outer surface of the peripheral wall portion is convex, and the inner radius of curvature of the vertical cross-section of the curved wall portion is 8 to 24 mm.

[0012] 2) The molded container according to 1), wherein the diameter or minimum diameter of the opening is 1.5 to 3 times the depth, which is the vertical distance from the top surface of the bottom wall to the opening.

[0013] 3) The molded container according to 1) or 2), wherein the diameter or minimum diameter of the opening is 1.1 to 8 times the diameter or minimum diameter of the bottom wall.

[0014] 4) A molded container according to any one of 1) to 3) above, wherein the depth, which is the vertical distance from the upper surface of the bottom wall to the opening, is 1.1 to 4 times the inner radius of curvature in the vertical cross-section of the curved wall.

[0015] 5) A molded container according to any one of 1) to 4) above, wherein the metal foil constituting the barrier layer is an Al-Fe alloy foil containing 0.7 to 1.7% Fe.

[0016] 6) A packaging body comprising one of the molded containers described in 1) to 5) above, which contains food containing oil or fat or pet feed containing oil, and a lid having a bottom surface made of heat-sealable resin, the peripheral edge of the bottom surface being heat-sealed to the upper surface of the flange portion of the molded container.

[0017] In the molded container described in 1) above, the innermost sealant layer is made of homopolypropylene film, making it difficult for oily components from foods containing oils and fats or pet feed containing oils and fats (hereinafter, these may be collectively referred to as "oil-containing foods, etc.") to penetrate. Furthermore, the bottom wall is flat, and at least the lower part of the peripheral wall connected to the bottom wall is made of a curved wall having a vertical cross-section with an inner radius of curvature of 8 to 24 mm. As a result, the degree of deformation of the metal laminate packaging material due to cold forming is reduced in these areas, and consequently, damage to the metal laminate packaging material due to deformation is reduced. Therefore, the molded container described in 1) above reliably prevents discoloration and odor transfer to the innermost surface when oil-containing foods, etc. are stored for a long period of time. Furthermore, according to the molded container described in 1) above, in addition to the above-mentioned configuration of the bottom wall and peripheral wall, by setting the thickness of the homopolypropylene film constituting the sealant layer to 150 to 400 μm, molding defects such as breakage, delamination, creasing, and pinholes caused by cold forming of metal laminate packaging material become less likely to occur, resulting in excellent moldability, and also enabling retort sterilization at relatively high temperatures, such as around 125°C.

[0018] With the molded containers described in 2) to 4) above, the degree of deformation of the metal laminate packaging material due to cold forming is further reduced in the bottom wall portion and near the boundary between the bottom wall portion and the peripheral wall portion, and damage to the metal laminate packaging material due to deformation is further reduced, so that the effects mentioned above regarding the molded container described in 1) above are achieved even more reliably.

[0019] According to the molded container of 5) above, since the barrier layer of the metal laminate packaging material is made of Al-Fe alloy foil containing 0.7 to 1.7% Fe, even better moldability can be obtained in cold forming processes such as deep drawing and stretching.

[0020] According to the packaging described in 6) above, even after storing oil-containing foods for a long period of time and then removing them, discoloration and flavoring due to the oil components of the oil-containing foods are less likely to occur on the innermost surface of the molded container, particularly the bottom wall and the area near the boundary between the bottom wall and the peripheral wall.

[0021] This is a cross-sectional view of the metal laminate packaging material constituting the molded container of this invention. This is a perspective view showing one embodiment of the molded container of this invention. This is a plan view of the molded container of Figure 2. This is a vertical cross-sectional view of the molded container of Figure 2. This is a perspective view showing another embodiment of the molded container of this invention. This is a plan view of the molded container of Figure 5. (a) is a vertical cross-sectional view of the molded container along the line A-A in Figure 6, and (b) is a vertical cross-sectional view of the molded container along the line B-B in Figure 6. This is a vertical cross-section showing a part of a package using the molded container of this invention.

[0022] Hereinafter, embodiments of this invention will be described with reference to Figures 1 to 8.

[0023] Figure 1 is a cross-sectional view showing one aspect of a metal laminate packaging material (10) constituting a molded container according to the present invention. The illustrated metal laminate packaging material (10) is formed by laminating a sealant layer (10a), a barrier layer (10b), and a protective resin layer (10c) in this order.

[0024] Figures 2 to 4 show one embodiment of a molded container according to the present invention. This molded container (1) comprises a bottom wall portion (11) having a circular planar shape, a peripheral wall portion (12) extending upward from the periphery of the bottom wall portion (11), an opening (13) defined by the upper edge of the peripheral wall portion (12), and a flange portion (14) extending outward from the upper edge of the peripheral wall portion (12) on the opposite side of the opening (13).

[0025] Figures 5 to 7 show another embodiment of the molded container according to the present invention. This molded container (1X) comprises a bottom wall portion (11X) having an oval planar shape, a peripheral wall portion (12X) extending upward from the periphery of the bottom wall portion (11X), an opening (13X) defined by the upper edge of the peripheral wall portion (12X), and a flange portion (14X) extending outward from the upper edge of the peripheral wall portion (12X) on the opposite side of the opening (13X).

[0026] Figure 8 shows a part of a package using the molded container of this invention. This package (4) consists of a molded container (1)(1X) containing oil-containing food or the like (2) as contents, and a lid (3) whose lower peripheral edge is heat-sealed to the upper surface of the flange portion (14)(14X) of the molded container (1)(1X).

[0027] The sealant layer (10a) of the metal laminate packaging material (10) is a layer that forms the innermost surface of the molded container (1)(1X) and is heat-sealed to the bottom surface of the lid (3), 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 the metal laminate packaging material (10) is deformed during molding, voids are less likely to form inside. Therefore, even if oil-containing foods etc. (2) are placed in the molded container (1)(1X), coloring and odor components derived from the oil-containing foods etc. (2) are less likely to penetrate into the interior of the sealant layer (10a), and as a result, the molded container (1)(1X) exhibits good resistance to coloring and odor. The thickness of the homopolypropylene film (A), i.e., the thickness of the sealant layer (10a), is preferably 150 to 400 μm, and more preferably 200 to 300 μm. If the thickness of the homopolypropylene film (A) is less than 150 μm, sufficient color resistance and odor resistance may not be obtained, and molding defects such as creasing due to cold forming will become more noticeable. On the other hand, if the thickness of the homopolypropylene film (A) exceeds 400 μm, problems with moldability will occur.

[0028] Various known homopolypropylene films (A) can be used, for example, a film made from isotactic homopolypropylene produced by polymerizing propylene in the presence of a Ziegler-Natta catalyst or a metallocene catalyst using bulk (suspension) polymerization, gas-phase polymerization, or a polymerization method combining bulk and gas phase polymerization. The means of film formation are 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. In the case of stretching, the homopolypropylene film (A) may be either stretched or unstretched. Choosing an unstretched type will result in better color resistance and odor resistance of the molded container (1)(1X). The homopolypropylene film (A) may be a single layer or a multi-layer (e.g., three layers) of two or more layers. The more homogeneous and denser the crystalline structure of the homopolypropylene film (A), the better the color resistance and odor resistance of the molded container (1)(1X). 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 90 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. Also, "crystalline melting energy" refers to the peak heat of fusion (crystalline melting energy, ΔH) measured by DSC in accordance with JIS K7122-1987. Furthermore, if there are multiple peak values ​​for Tmp and ΔH, the maximum value of each is adopted. These melting points and crystal melting energies are preferably 160 to 170°C and 90 to 105 J / g, respectively, which results in better color resistance and odor resistance of the molded container (1)(1X). Furthermore, if the tensile yield stress (TYS) of the homopolypropylene film (A) is 25 MPa or higher, the molded container (1)(1X) will have good color resistance and odor resistance, as well as superior mechanical properties such as impact resistance and durability. Here, "tensile yield stress" is a measured value in accordance with JIS K7127-1999, and is the average value of the TYS in the MD direction and the TYS in the TD direction.The tensile yield stress is preferably 25 to 45 MPa, more preferably 31 to 39 MPa, thereby improving the mechanical performance of the molded container (1)(1X). 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.

[0029] The barrier layer (10b) is a layer for protecting oil-containing foods, etc. (2) from gas, water vapor, light, etc., and is composed of various known metal foils (B). Examples of metal foils (B) 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) using aluminum foil as the metal foil (B) 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 (10b). 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% Fe is particularly preferred. For example, soft materials (O material) of the A1000 series or A8000 series as defined in JIS H4160-2006 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 A1N30H-O material. The thickness of the metal foil (B), i.e., the thickness of the barrier layer (10b), is not particularly limited, but from the viewpoint of defects in the barrier layer (10b) and the durability and impact resistance of the molded container (1)(1X) and packaging (4), it is usually 50 to 200 μm, and preferably 50 to 150 μm.

[0030] A base layer may be formed on at least one of the two surfaces of the barrier layer (10b) 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 liquid to the surface of a degreased metal foil (B). (i) A water-alcohol solution containing phosphoric acid, chromic acid, and at least one compound selected from the group consisting of metal salts and nonmetallic salts of fluoride. (ii) A water-alcohol solution containing 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 containing 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 and nonmetallic salts of fluoride. The amount of chemical treatment solution used is not particularly limited, and the amount of chromium deposited on one side of the barrier layer (10b) is usually 0.1 to 50 mg / m². ２ Preferably 2 to 20 mg / m² ２ Any range within that range is acceptable.

[0031] The protective resin layer (10c) is a layer that forms the outermost surface of the molded container (1)(1X), ensures the strength of the molded container (1)(1X) and the packaging (4), and protects the oil-containing food product (2) contained in the packaging (4) from the outside. It is composed of various known synthetic resin films (C). Examples of synthetic resins that make up the synthetic resin film (C) include polyolefins, polyesters, 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. The film made of homopolypropylene may be the same as the homopolypropylene film (A) that constitutes the sealant layer (10a). Both polyethylene and polypropylene may be modified with acids 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 (C) is not particularly limited and various known (co)extrusion molding methods (inflation, T-die, etc.), stretching methods, lamination methods, etc. are examples. In the case of the stretching method, the synthetic resin film (C) may be either stretched or unstretched. The synthetic resin film (C) may contain the filler and / or the elastomer. If the synthetic resin film (C) is composed of a laminated film of two or more layers including 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)(1X) are improved. Specifically, the number of layers in the laminated film should be between two and five.Specific examples of laminated films include two- or three-layer polyolefin films in which a poly(ethylene-propylene) random copolymer layer and a polyethylene-polypropylene block copolymer layer are combined in any order. A layer of an overcoat agent composed 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 (C). The thickness of the synthetic resin film (C), i.e., the thickness of the protective resin layer (10c), is not particularly limited, but considering the durability, impact resistance, and weather resistance of the molded container (1)(1X) and the packaging (4), it is usually 15 to 50 μm, preferably 15 to 40 μm.

[0032] The metal laminate packaging material (10) can be manufactured by various known methods. Examples of manufacturing methods include dry lamination, extrusion lamination, and heat lamination. In the case of dry lamination, adhesive layers (10d) are provided between the sealant layer (10a) and the barrier layer (10b), and between the barrier layer (10b) and the protective resin layer (10c) (see Figure 1). Various known adhesives can be used to form these adhesive layers (10d), such as polyurethane resin adhesives, acrylic resin adhesives, epoxy resin adhesives, polyolefin resin adhesives, and elastomer adhesives, and two or more may 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 preferred. By including fillers in the adhesive, the adhesive layer (10d) can be given, for example, a design feature. Examples of fillers include white clay, silica, talc, titanium dioxide, and carbon black, and two or more types may be combined. In particular, including a white pigment such as titanium dioxide makes it easier to detect foreign matter mixed into the inner surface of the molded container (1)(1X). Considering the balance between these effects and the adhesive strength of the adhesive layer (10d), the filler content is usually 10 to 60% by mass. The thickness of the adhesive layer (10d) is not particularly limited and is usually 1 to 5 μm.

[0033] In the metal laminate packaging material (10), any other arbitrary layer may be provided between the sealant layer (10a) and the barrier layer (10b), or between the barrier layer (10b) and the protective resin layer (10c). For example, a printing layer (not shown) can be provided between the barrier layer (10b) and the protective resin layer (10c). This printing layer allows for the application of desired designs, text, graphic information, etc., to the molded container (1)(1X). The printing layer is composed of a printing ink in which a colorant is dispersed in a binder resin by various known means, and can be formed by various known printing methods such as bar coating, gravure printing, offset printing, and gravure-offset printing.

[0034] Preferred embodiments of the metal laminate packaging material (10) include the following: • Sealant layer (10a): Unstretched homopolypropylene film (thickness 150-400 μm, preferably 200-300 μm) • Barrier layer (10b): Aluminum foil with a base layer formed on at least one side using the chemical conversion treatment solution (particularly JIS H4160-2006 A8079H-O material or A8021H-O material) (thickness 50-200 μm, preferably 50-150 μm) • Protective resin layer (10c): Two or three layers of polyolefin film in which a poly(ethylene-propylene) random copolymer layer and a polyethylene-polypropylene block copolymer layer are combined in any order (total thickness 15-50 μm, preferably 15-40 μm)

[0035] The molded container (1)(1X) of this invention is formed by molding a metal laminate packaging material (10) using various known cold forming methods. Examples of molding methods include press forming such as stretch forming 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 (10c) side. Next, a movable male die, which is the same shape as the housing part of the molded container (1)(1X), is lowered from the sealant 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)(1X) is removed from the fixed female die. The flange portion (14)(14X) of the molded container (1)(1X) may be trimmed as needed to remove unnecessary parts. In this way, a molded container (1)(1X) of the desired shape is obtained.

[0036] In the case of the molded container (1) shown in Figures 2 to 4, the bottom wall (11) is flat with a circular planar shape, that is, it is a circular horizontal plate. The peripheral wall (12) of the molded container (1) extends upward from the periphery of the bottom wall (11) and has a circular horizontal cross-sectional shape similar to the contour of the planar shape of the bottom wall (11). The lower part of the peripheral wall (12) consists of a curved wall (121) having a vertical cross-section that is curved so that the outer surface of the peripheral wall (12) is convex. The upper part of the peripheral wall (12) consists of an inclined wall (122) that is inclined radially outward toward upward. As shown in the figure, an annular stepped portion (123) may be formed in the middle of the height of the inclined wall (122), with the inner surface of the molded container (1) facing upward. The curved wall portion (121) may have a vertical cross-section of an arc-shaped curve with a constant radius of curvature, or it may have a vertical cross-section of a non-arc-shaped curve with a changing radius of curvature. The radius of curvature (R1) on the inside of the vertical cross-section of the curved wall portion (121) is 8 to 24 mm (in the case of a non-arc-shaped curve, the minimum value of the radius of curvature is 8 mm or more and the maximum value is 24 mm or less), preferably 10 to 20 mm. If the radius of curvature (R1) is less than 8 mm, the degree of deformation of the curved wall portion (121) due to the cold forming process of the metal laminate packaging material (10) may become too large, which may result in insufficient color resistance and odor resistance, and the moldability may also decrease. On the other hand, if the radius of curvature (R1) exceeds 24 mm, it becomes difficult to stack multiple molded containers when stacking them for transportation or storage. In addition to the above-described configuration, the peripheral wall portion (12) may also be composed of a curved wall portion (121) almost entirely. The flange portion (14) is a flat, circular ring shape, and as described later, its upper surface is heat-sealed to the lower surface of the lid (3). The width of the flange portion (14) is not particularly limited, but is usually 5 to 10 mm. The diameter (D2) of the opening (13) of the molded container (1) is preferably 1.5 to 3 times the depth (H1), which is the vertical distance from the upper surface of the bottom wall portion (11) to the opening (13), and more preferably 1.6 to 2.5 times. Furthermore, the diameter (D2) of the opening (13) of the molded container (1) is preferably 1.1 to 8 times the diameter (D1) of the bottom wall portion (11), and more preferably 1.5 to 2.7 times.Furthermore, the depth (H1) of the molded container (1), which is the vertical distance from the top surface of the bottom wall portion (11) to the opening (13), is preferably 1.1 to 4 times, and more preferably 1.3 to 2.5 times, the inner radius of curvature (R1) in the vertical cross-section of the curved wall portion (121). If the ratio of the diameter (D2) to the depth (H1), the ratio of the diameter (D2) to the diameter (D1), and the ratio of the depth (H1) to the radius of curvature (R1) are within the above ranges, the degree of deformation of the curved wall portion (121) due to the cold forming process of the metal laminate packaging material (10) is reduced, resulting in improved color resistance and odor resistance, as well as improved moldability.

[0037] The molded container (1X) shown in Figures 5-7 has a flat bottom wall (11X) with an oval planar shape, that is, an oval-shaped horizontal plate. Here, "oval shape" refers to an ellipse, oblong, egg shape, and similar shapes, which have a major axis and a minor axis that are perpendicular to each other and pass through the center. The peripheral wall (12X) of the molded container (1X) extends upward from the periphery of the bottom wall (11X) and has an oval-shaped horizontal cross-section similar to the contour of the planar shape of the bottom wall (11X). The lower part of the peripheral wall (12X) consists of a curved wall (121X) which has a vertical cross-section that is curved so that the outer surface of the peripheral wall (12X) is convex. The upper part of the peripheral wall (12X) consists of an inclined wall (122X) which is inclined radially outward toward upward. As shown in the figure, an annular stepped portion (123X) may be formed in the middle of the height of the inclined wall portion (122X), with the inner surface of the molded container (1X) facing upward. The curved wall portion (121X) may have a vertical cross-section of an arc-shaped curve with a constant radius of curvature, or it may have a vertical cross-section of a non-arc-shaped curve with a changing radius of curvature. The radius of curvature (R1) on the inside of the vertical cross-section of the curved wall portion (121X) is 8 to 24 mm (in the case of a non-arc-shaped curve, the minimum value of the radius of curvature is 8 mm or more and the maximum value is 24 mm or less), preferably 10 to 20 mm. If the radius of curvature (R1) is less than 8 mm, the degree of deformation of the curved wall portion (121X) due to the cold forming process of the metal laminate packaging material (10) may become too large, which may result in insufficient color resistance and odor resistance, and the moldability may also decrease. On the other hand, if the radius of curvature (R1) exceeds 24 mm, it becomes difficult to stack multiple molded containers when transporting or storing them. In addition to the above configuration, the peripheral wall portion (12X) may also be composed of a curved wall portion (121X) almost entirely. The flange portion (14X) is a flat, oval-shaped ring, and as described later, its upper surface is heat-sealed to the lower surface of the lid (3). The width of the flange portion (14X) is not particularly limited, but is usually 5 to 10 mm.The molded container (1X) preferably has a minimum diameter (length of the minor axis) (D22) of its opening (13X) that is 1.5 to 3 times the depth (H1), which is the vertical distance from the top surface of the bottom wall (11X) to the opening (13X), and more preferably 1.6 to 2.5 times. Furthermore, the molded container (1X) preferably has a minimum diameter (length of the minor axis) (D22) of its opening (13X) that is 1.1 to 8 times the minimum diameter (length of the minor axis) (D12) of the bottom wall (11X), and more preferably 1.5 to 2.7 times. Furthermore, the molded container (1X) preferably has a depth (H1), which is the vertical distance from the top surface of the bottom wall (11X) to the opening (13X), that is 1.1 to 4 times the inner radius of curvature (R1) in the vertical cross-section of the curved wall (121X), and more preferably 1.3 to 2.5 times. If the ratio of the minimum diameter (D22) to the depth (H1), the ratio of the minimum diameter (D22) to the minimum diameter (D12), and the ratio of the depth (H1) to the radius of curvature (R1) are kept within the above range, the degree of deformation of the curved wall portion (121X) during the cold forming process of the metal laminate packaging material (10) will be reduced, resulting in improved color resistance and odor resistance, as well as improved moldability.

[0038] The packaging body (4) of this invention is obtained by placing oil-containing food products, etc. (2) in a molded container (1)(1X), and then heat-sealing the lower surface of the lid (3) to the upper surface of the flange portion (13)(13X).

[0039] Examples of oil-containing foods (2) contained in molded containers (1)(1X) include semi-solid or solid processed foods containing animal fats and vegetable fats. 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.). In addition, there are a considerable number of semi-solid (wet type) or solid (dry type) pet foods given to companion animals such as dogs and cats that contain large amounts of animal fats and vegetable fats to supplement nutrients, and these may also be included.

[0040] The lid (3) is a sealing means for oil-containing food products (2) contained in the molded container (1)(1X), and is made of laminate packaging material (30). In Figure 8, the laminate packaging material (30) is made by laminating a predetermined protective resin layer (30a), a metal foil layer (30b), a reinforcing layer (30c), and a heat-sealable resin layer (30d) in this order. However, the metal foil layer (30b) and the reinforcing layer (30c) are both optional and can be omitted. The protective resin layer (30a) is the layer that forms the outermost surface (top surface) of the lid (3), and is made of various known synthetic resin films. As the synthetic resin film that constitutes the protective resin layer (30a), the same as the synthetic resin film (D) that constitutes the protective resin layer (10c) of the metal laminate packaging material (10) can be used, and films selected from stretched polypropylene film, stretched polyethylene terephthalate film, and stretched polyamide film are preferred. The protective resin layer (30a) may be a multilayer formed by combining two or more identical or different synthetic resin films in any order. Alternatively, the protective resin layer (30a) may be composed of an overcoat agent made of a thermosetting crosslinkable resin such as epoxy resin, chlorinated polyolefin resin, nitrated cotton, acrylic resin, or vinyl chloride-vinyl acetate copolymer. The thickness of the protective resin layer (30a) is not particularly limited, but is usually 1 to 30 μm from the viewpoint of durability, impact resistance, and weather resistance of the packaging (4). An optional metal foil layer (30b) functions as a barrier layer to protect the oil-containing food product (2) contained in the molded container (1)(1X) from gas, water vapor, light, etc. The metal foil can be the same as the metal foil (C) that constitutes the barrier layer (10b) of the metal laminate packaging material (10), 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 made of the chemical conversion treatment solution may be formed on at least one of the two surfaces of the metal foil layer (30b). The thickness of the metal foil layer (30b) is not particularly limited, and is usually 5 to 40 μm. An optional reinforcing layer (30c) is made of various known synthetic resin films and can be interposed between the metal foil layer (30b) and the heat-sealable resin layer (30d) to improve the strength of the lid (3).Examples of synthetic resin films include the polyolefin film (B) mentioned above, as well as polyester film and polyamide film. The reinforcing layer (30c) may be a composite film of two or more layers of synthetic resin film. The thickness of the reinforcing layer (30c) is not particularly limited, and is usually 5 to 30 μm. The heat-sealable resin layer (30d) is a layer that is heat-sealed to the sealant layer (10a) that constitutes the upper surface of the flange portion (14)(14X) of the molded container (1)(1X), 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 (30d) may be a multilayer formed by combining two or more identical or different thermoplastic resin films in any order. In a preferred embodiment, the heat-sealable resin layer (30d) is made of an easily openable film. The easily openable film is capable of cohesive failure or interlayer delamination, and is designed to allow cohesive delamination or interlayer delamination within the heat-sealable resin layer (30d) when the lid (3) is peeled off and opened. Specifically, for example, the heat-sealable resin layer (30d) of the lid (3) is made of a polypropylene-based co-extruded multilayer film (interlayer delamination type) and is heat-sealed to a sealant layer (10a) made of a homopolypropylene film (A) that constitutes the upper surface of the flange portion (14) of the molded container (1)(1X). In this embodiment, no notch is formed on the upper surface of the flange portion (14)(14X) of the molded container (1)(1X). The thickness of the heat-sealable resin layer (30d) is not particularly limited and is usually 10 to 100 μm. The laminated packaging material (30) 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.

[0041] The lid (3) is formed by processing the above-described laminate packaging material (30) into a desired shape. The shape of the lid (3) is not particularly limited, and for example, it is made to be the same shape or a similar shape as the flange portions (14)(14X) of the formed containers (1)(1X). An opening tab may be optionally provided on the lid (3), and its size and shape are not particularly limited. Examples of the shape of the opening tab include a semi-circular shape, a triangular shape, and a quadrangular shape. The opening tab is usually composed of a part of the laminate packaging material (30) constituting the lid (3), but a separately produced tab may be attached to a part of the outer peripheral edge of the lid (3).

[0042] The manufacturing method of the package (4) is not particularly limited, and various known methods can be used. Specifically, for example, after putting a predetermined amount of an oil-containing food or the like (2) into the formed containers (1)(1X), a lid (3) having a predetermined shape is placed on the upper surface of the flange portions (14)(14X) from the side of the heat-sealable resin layer (30d), and an annular heat sealer heated to a predetermined temperature is pressed against a predetermined position with a predetermined pressure for a predetermined time, so that the heat-sealable resin layer (30d) forming the lower surface of the lid (3) and the sealant layer (10a) forming the upper surface of the flange portions (14)(14X) of the formed containers (1)(1X) are heat-sealed, and the package (4) is obtained by performing heat sealing. The periphery of the lid (3) may be trimmed as necessary.

[0043] The opening of the package (4) is performed by cohesive peeling or interlayer peeling occurring in the heat-sealable resin layer (30d) of the lid (3), or it may be performed by interface peeling occurring between the heat-sealable resin layer (30d) of the lid (3) and the sealant layer (10a) of the formed containers (1)(1X). As shown in FIG. 8, in the package (4), an annular heat-sealed portion (41) extending over the entire circumference of the flange portions (14)(14X) is formed between the lower surface of the lid (3) and the upper surface of the flange portions (14)(14X). In addition, an unsealed portion (42) having a predetermined width is formed outside the heat-sealed portion (41), and this can be used as an opening cut. The width of the unsealed portion (42) is not particularly limited, but when the width of the flange portions (14)(14X) is 5 to 10 mm, it is usually 1 to 3 mm. Also, in this case, the width of the heat-sealed portion (41) is usually 7 to 9 mm.

[0044] Hereinafter, the present invention will be further described through Examples and Comparative Examples, but the technical scope of the present invention is not limited thereby.

[0045] The abbreviations used in the examples have the following meanings. Tmp (°C): melting point (JIS K7121-1987) ΔH (J / g): crystal melting energy (JIS K7122-1987) TYS (MPa): tensile yield stress (JIS K7127-1999) 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 type polyester-polyurethane based adhesive

[0046] The melting point (Tmp °C) and crystal melting energy (ΔH J / g) are measured values under the following conditions. - Measuring device: Differential Scanning Calorimeter "DSC-60A" manufactured by Shimadzu Corporation - Sample amount: 5 mg - Measuring temperature: 23°C to 210°C - Heating rate: 10°C / min

[0047] The tensile yield stress (TYS) is a measured value under the following conditions using a tensilon RTG-1210 manufactured by A&D Company, Limited. - Gauge length: 50 mm - Tensile speed: 100 mm / min - Test piece: Type 2 (width 15 mm)

[0048] Table 1 shows the melting points, crystal melting energies and tensile yield stresses of HPP1, HPP2, HPP3, rPP, bPP, LLDPE and rPP-hPP-rPP.

[0049]

[0050] 1. Production of Aluminum Laminated Packaging Material Production Example 1 Both sides of a 120-μm-thick aluminum foil (A8079H-O material) were treated with a chemical conversion treatment liquid composed of phosphoric acid, an acrylic resin, a chromium (III) salt compound, water and alcohol to produce a treated aluminum foil with a base layer formed. The chromium adhesion amount per side was 10 mg / m 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 obtain aluminum laminate packaging material A.

[0051] 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 (400 μm thick, manufactured by T-die method) or a film made of HPP3 (250 μm thick, manufactured by T-die method) was used instead of a film made of HPP1.

[0052] Manufacturing Example 4: Aluminum laminate packaging material D was prepared in the same manner as in Manufacturing Example 1, except that the thickness of the film made of HPP1 was set to 200 μm.

[0053] Manufacturing Example 5: Aluminum laminate packaging material E was prepared in the same manner as in Manufacturing Example 2, except that the thickness of the film made of HPP2 was set to 350 μm.

[0054] Manufacturing Example 6 An aluminum laminate packaging material F was prepared in the same manner as in Manufacturing Example 1, except that the thickness of the film made of HPP1 was set to 150 μm.

[0055] Comparative Manufacturing Example 1: Aluminum laminate packaging material G was prepared in the same manner as in Manufacturing Example 1, except that the thickness of the film made of HPP1 was set to 120 μm.

[0056] Comparative Manufacturing Example 2: Aluminum laminate packaging material H was prepared in the same manner as in Manufacturing Example 1, except that the thickness of the film made of HPP1 was set to 450 μm.

[0057] Comparative Manufacturing Example 3: A PU adhesive was applied to one side of the treated aluminum foil from Manufacturing Example 1 to a dry film thickness of 3 μm, and a 350 μm thick rPP 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 3-layer co-extruded polyolefin film from Manufacturing Example 1 was laminated to it to create a laminate. Next, the laminate was aged under the same conditions as in Manufacturing Example 1 to obtain aluminum laminate packaging material I.

[0058] Comparative Manufacturing Example 4: A PU adhesive was applied to one side of the treated aluminum foil from Manufacturing Example 1 to a dry film thickness of 3 μm, and a 350 μm thick bPP 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 3-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 obtain aluminum laminate packaging material J.

[0059] Comparative Manufacturing Example 5: A PU adhesive was applied to one side of the treated aluminum foil from Manufacturing Example 1 to a dry film thickness of 3 μm, and a 350 μm thick LLDPE 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 3-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 obtain aluminum laminate packaging material K.

[0060] Comparative Manufacturing Example 6 A PU adhesive was applied to one side of the treated aluminum foil from Manufacturing Example 1 to a dry film thickness of 3 μm, and a 3-layer co-extruded polypropylene film with a total thickness of 350 μm, consisting of a 90 μm thick rPP layer, a 170 μm thick hPP layer, and a 90 μm thick rPP layer, 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 the 3-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 obtain an aluminum laminate packaging material L.

[0061] 2. Example 1 of Manufacturing a Molded Container An aluminum laminate packaging material A was set in a press die machine and deep drawing was performed, and the flange portion was trimmed to produce a circular cup-shaped molded container A as shown in Figures 2 to 4. The dimensions of the molded container A were as follows: bottom wall diameter (D1): 19 mm, radius of curvature (R1) on the inside of the vertical cross-section of the curved wall portion of the peripheral wall: 16 mm, depth (H1): 28 mm, opening diameter (D2): 50 mm, diameter (D2) / depth (H1): 1.786, diameter (D2) / diameter (D1): 2.63, depth (H1) / radius of curvature (R1): 1.75, and flange width: 4.5 mm.

[0062] Example 2 An aluminum laminate packaging material B was set in a press die machine and deep drawing was performed, and the flange portion was trimmed to produce a circular cup-shaped molded container B as shown in Figures 2 to 4. The dimensions of the molded container B were as follows: bottom wall diameter (D1): 14 mm, radius of curvature (R1) on the inside of the vertical cross-section of the curved wall portion of the peripheral wall: 20 mm, depth (H1): 25 mm, opening diameter (D2): 55 mm, diameter (D2) / depth (H1): 2.2, diameter (D2) / diameter (D1): 3.92, depth (H1) / radius of curvature (R1): 2.5, and flange width: 4.5 mm.

[0063] Example 3 An aluminum laminate packaging material C was set in a press die machine and deep drawing was performed, and the flange portion was trimmed to produce a circular cup-shaped molded container C as shown in Figures 2 to 4. The dimensions of the molded container C were as follows: bottom wall diameter (D1): 17 mm, radius of curvature (R1) on the inside of the vertical cross-section of the curved wall portion of the peripheral wall: 12 mm, depth (H1): 30 mm, opening diameter (D2): 45 mm, diameter (D2) / depth (H1): 1.5, diameter (D2) / diameter (D1): 2.64, depth (H1) / radius of curvature (R1): 2.5, and flange width: 4.5 mm.

[0064] Example 4 An aluminum laminate packaging material D was set in a press die machine and deep drawing was performed, and the flange portion was trimmed to produce a circular cup-shaped molded container D as shown in Figures 2 to 4. The dimensions of the molded container D were as follows: bottom wall diameter (D1): 30 mm, radius of curvature (R1) on the inside of the vertical cross-section of the curved wall portion of the peripheral wall: 8 mm, depth (H1): 28 mm, opening diameter (D2): 50 mm, diameter (D2) / depth (H1): 1.786, diameter (D2) / diameter (D1): 1.66, depth (H1) / radius of curvature (R1): 3.5, and flange width: 4.5 mm.

[0065] Example 5 An aluminum laminate packaging material E was set in a press die machine and deep drawing was performed, and the flange portion was trimmed to produce a circular cup-shaped molded container E as shown in Figures 2 to 4. The dimensions of the molded container E were as follows: bottom wall diameter (D1): 7 mm, radius of curvature (R1) on the inside of the vertical cross-section of the curved wall portion of the peripheral wall: 24 mm, depth (H1): 25 mm, opening diameter (D2): 55 mm, diameter (D2) / depth (H1): 2.2, diameter (D2) / diameter (D1): 7.85, depth (H1) / radius of curvature (R1): 1.04, and flange width: 4.5 mm.

[0066] Example 6 An aluminum laminate packaging material F was set in a press die machine and deep drawing was performed, and the flange portion was trimmed to produce a circular cup-shaped molded container F as shown in Figures 2 to 4. The dimensions of the molded container F were the same as the dimensions of molded container A.

[0067] Comparative Example 1 An aluminum laminate packaging material D was set in a press die machine and deep drawing was performed, and the flange portion was trimmed to produce a circular cup-shaped molded container G as shown in Figures 2 to 4. The dimensions of molded container G were the same as those of molded container D, except that the diameter of the bottom wall (D1) was 42 mm, the radius of curvature (R1) on the inside of the vertical cross-section in the curved wall portion of the peripheral wall was 1 mm, the diameter (D2) / diameter (D1) was 1.19, and the depth (H1) / radius of curvature (R1) was 28.

[0068] Comparative Examples 2-7 Aluminum laminate packaging materials G, H, I, J, K, and L were each set in a press die machine, and deep drawing was performed, along with trimming of the flange portion, to produce circular cup-shaped molded containers H, I, J, K, L, and M as shown in Figures 2-4. The dimensions of molded containers H, I, J, K, L, and M were the same as the dimensions of molded container A.

[0069] 3. Lid Fabrication Example 7 A treated aluminum foil was fabricated by chemically treating both sides of a 12 μm thick aluminum foil (A8021H-H18 material) with the coating solution from Fabrication 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 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 thickness of 3 μm, and a 50 μm thick polypropylene-based co-extruded multilayer film (peel-off type) was laminated to it as a heat-sealable resin layer 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.

[0070] 4. Example 1 of packaging preparation Two molded containers A were prepared. 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 in one molded container A, and lid A was placed on the flange. Next, an annular sealer (7mm wide) heated to 190°C was used to heat-seal lid A and the flange of molded container A at 0.2 MPa 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. 20ml of water was placed in the other molded container A, and lid A was heat-sealed to its flange using the same method and conditions to create a package A containing water.

[0071] Examples 2-6: For molded containers B-F, packaging bodies B-F containing curry roux and packaging bodies B-F containing water were prepared in the same manner as in Example 1.

[0072] Comparative Examples 1-7: For molded containers G-M, curry roux-filled packages G-M and water-filled packages G-M were prepared using lid A in the same manner as in Example 1.

[0073] 5. Evaluation of Packaging 5-1. Resistance to Coloring and Aroma After leaving package A containing curry roux at room temperature for four weeks, lid A was peeled off from the flange of molded container A and opened. Next, the curry roux was removed from the opened molded container A, the inside was washed, and then wiped with a cloth. The coloring on the inner surface of molded container A and the residual aroma inside molded container A were sensorily evaluated according to the following criteria. The same sensory evaluation was performed on package B to M containing curry roux.

[0074] ◎: No discoloration or lingering fragrance was observed on the inner surface of the molded container. ○: Slight discoloration was observed on the inner surface of the molded container. No lingering fragrance was observed. ×: Severe discoloration was observed on the inner surface of the molded container. A lingering fragrance was also observed.

[0075] 5-2. Moldability Five moldable containers A were molded, and their surface walls were visually inspected for any fractures. The moldability was evaluated according to the following criteria. The same evaluation was performed for moldable containers B to M.

[0076] ◎: 5 unbroken items. ○: 4 unbroken items. △: 3 unbroken items. ×: 2 or fewer unbroken items.

[0077] 5-3. Five heat-resistant water-filled packages A were prepared and retort-sterilized at 125°C for 30 minutes. Then, lid A was peeled off the flange portion of molded container A to open it. Next, after removing the water from the opened molded container A, the inner surface of molded container A was visually inspected to see if delamination (delamination between the heat-sealable resin film (A) and the metal foil (B)) was observed, and the heat resistance was evaluated according to the following criteria. The same evaluation was performed for water-filled packages B to M.

[0078] ◎: 5 items with no peeling. △: 4 items with no peeling. ×: 2 or fewer items with no peeling.

[0079] Table 2 shows the layer structure and dimensions of molded containers A to M, as well as the evaluation results regarding the color resistance, odor resistance, moldability, and heat resistance of packaging A to M.

[0080]

[0081] The molded container of this invention is suitable for packaging and long-term storage of foods containing oils and fats, such as curry, stew, and pasta sauce, as well as animal feed containing oils and fats.

[0082] (10) Metal laminate packaging, (10a) sealant layer, (10b) barrier layer, (10c) protective resin layer, (A) homopolypropylene film (heat-fusible resin film), (B) metal foil, (C) synthetic resin film, (1)(1X) molded container, (11)(11X) bottom wall, (12)(12X) peripheral wall, (121)(121X) curved wall, (13)(1 3X) Opening, (14)(14X) Flange section, (D1) Diameter of bottom wall, (D12) Minimum diameter of bottom wall, (D2) Diameter of opening, (D22) Minimum diameter of opening, (H1) Depth of molded container, (2) Oil-containing food, etc., (3) Lid, (30) Laminated packaging material, (30a) Protective resin layer, (30b) Metal foil layer, (30c) Reinforcement layer, (30d) Heat-sealable resin layer, (4) Packaging body

Claims

1. A molded container for containing food containing oil or fat, or pet feed containing oil, which is made by cold forming a metal laminate packaging material, comprising: a flat bottom wall having a circular or oval planar shape; a peripheral wall extending upward from the periphery of the bottom wall and having a circular or oval horizontal cross-sectional shape similar to the planar shape of the bottom wall; an opening defined by the upper edge of the peripheral wall; and an annular flange extending outward from the upper edge of the peripheral wall on the opposite side of the opening; wherein the metal laminate packaging material comprises a sealant layer made of a heat-sealable resin film and constituting the innermost surface of the molded container; a barrier layer made of metal foil; and a protective resin layer made of a synthetic resin film and constituting the outermost surface of the molded container; wherein the heat-sealable resin film constituting the sealant layer is made of a homopolypropylene film having a thickness of 150 to 400 μm. A molded container wherein at least the lower part of the peripheral wall portion connected to the bottom wall portion is composed of a curved wall portion having a vertical cross-section that is curved such that the outer surface of the peripheral wall portion is convex, and the inner radius of curvature of the vertical cross-section of the curved wall portion is 8 to 24 mm.

2. The molded container according to claim 1, wherein the diameter or minimum diameter of the opening is 1.5 to 3 times the depth, which is the vertical distance from the upper surface of the bottom wall to the opening.

3. The molded container according to claim 1, wherein the diameter or minimum diameter of the opening is 1.1 to 8 times the diameter or minimum diameter of the bottom wall.

4. The molded container according to claim 1, wherein the depth, which is the vertical distance from the upper surface of the bottom wall to the opening, is 1.1 to 4 times the inner radius of curvature in the vertical cross-section of the curved wall.

5. The molded container according to claim 1, wherein the metal foil constituting the barrier layer is an Al-Fe alloy foil containing 0.7 to 1.7% Fe.

6. A packaging body comprising a molded container according to claim 1, which contains food containing oil or fat or pet feed containing oil, and a lid having a bottom surface made of heat-sealable resin, the peripheral edge of the bottom surface being heat-sealed to the upper surface of the flange portion of the molded container.

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