Packaging material and packaged body

Abstract

To provide a packaging material and a packaged body capable of suppressing deformation and damage of a formed identification mark.SOLUTION: A packaging material 10 is composed of by being laminated in this order from one side thereof: a laminate 1 in which a first resin layer 2; a metal foil layer 3; and a second resin layer 4. An identification mark composed of one or more concave markings 210 is provided on the surface of the laminate 1 on the side of the first resin layer 2. In the concave markings 210, the metal foil layer 3 is deformed into a shape corresponding to the concave markings 210 to form a concave deformation portion 310. A side surface 310b of the concave deformation portion 310 has two facing portions 310c located on one imaginary vertical plane, and the distance between two imaginary vertical lines L1 passing through a connecting portion C between the two facing portions 310c on the side surface 310b of the concave deformation portion 310 and a bottom surface 310a is 1 mm or more. Furthermore, the angle X between the imaginary vertical line L1 and a peripheral portion 310d connected to the connecting portion C on the bottom surface 310a of the concave deformation portion 310 is 70 degrees or more and less than 90 degrees.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] This invention relates to a packaging material and a package.

[0002] In this specification and the claims, the term "aluminum" shall include aluminum alloys in addition to pure aluminum.

Background Art

[0003] In the food field where the contents are foods such as beverages, puddings, jellies, yogurts, semi-solid products such as butter and jams, and foods containing fats, oils and liquids such as curries, canned tuna, and soups, in the medical and pharmaceutical field where the contents are oral medications, transdermal absorbents such as compresses, and medical products requiring aseptic packs, in the industrial field where the contents are greases, adhesives, oils, etc., and in the electronic component field where the contents are electronic components, etc., the packaging materials used are generally marked with identification marks containing arbitrary information.

[0004] As a method of attaching an identification mark to a packaging material, there is also a method of attaching a label indirectly displayed on a container, such as sticking a seal printed with an identification mark or winding a shrink label with printing, but various proposals have also been made for a method of directly displaying an identification mark on a packaging material. When directly displaying an identification mark on a packaging material, it is not necessary to generate extra waste, so environmental considerations are also taken into account.

[0005] As a packaging material with a directly displayed identification mark, the one described in Patent Document 1 is known.

[0006] The packaging material described in Patent Document 1 is formed by forming an identification mark consisting of a convex pattern bent outward using a device composed of a movable part and a support part on the peripheral wall of a tubular body made of an aluminum laminate sheet in which an outer resin layer, an aluminum layer, and an inner resin layer are laminated in this order. The movable part of the device has an outer plate part with a recess engraved on the lower surface of a hot plate fixed thereto, and the support part has an inner plate part with a convex part fixed to a core member inserted into a tubular body provided with a heater. After covering the tubular body with the core member, by pressing the peripheral wall of the tubular body with the recess of the heated outer plate part and the convex part of the heated inner plate part, an identification mark consisting of a convex pattern is formed.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0008] However, in the case of the packaging material described in Patent Document 1, when the packaging material is stored and transported, or when the package using the packaging material is stored and transported and receives an external impact, there is a problem that the identification mark consisting of a convex stripe pattern is likely to be deformed or damaged.

[0009] Also, in the case of the packaging material described in Patent Document 1, the device for forming the convex pattern is composed of a movable part and a support part. The movable part has an outer plate part with a recess engraved on the lower surface of a hot plate fixed thereto, and the support part has an inner plate part with a convex part fixed to a core member inserted into a tubular body provided with a heater. Therefore, the configuration of the manufacturing device becomes relatively complicated, and moreover, since both the outer plate part and the inner plate part are heated when forming the convex pattern, there is a problem that the manufacturing cost becomes high.

[0010] In view of the above circumstances, an object of the present invention is to provide a packaging material and a package that can suppress deformation and damage of a formed identification mark and can reduce manufacturing costs.

Means for Solving the Problems

[0011] In order to achieve the above object, the present invention comprises the following aspects.

[0012] 1) It consists of a laminate in which a first resin layer, a metal foil layer, and a second resin layer are laminated in this order from one side, and an identification mark composed of one or more concave engraved portions is provided on the surface of the laminate on the first resin layer side. In the concave engraved portion, the metal foil layer is deformed into a shape corresponding to the concave engraved portion to form a concave deformed portion. A packaging material.

[0013] 2) The angle formed by a virtual vertical line passing through the connecting portion of the bottom surface and the side surface of the concave deformed portion of the metal foil layer and a peripheral portion of a certain width connected to the connecting portion on the bottom surface of the concave deformed portion is 90 degrees or less. The packaging material according to 1) above.

[0014] 3) The side surface of the concave deformed portion of the metal foil layer has two opposing portions located on one virtual vertical plane, and the distance between two virtual vertical lines passing through the connecting portions of the two opposing portions and the bottom surface on the side surface of the concave deformed portion of the metal foil layer is 1 mm or more. The angle formed by the two virtual vertical lines passing through the connecting portions of the two opposing portions and the bottom surface and a peripheral portion of a certain width connected to the connecting portion on the bottom surface of the concave deformed portion is 70 degrees or more and less than 90 degrees. The packaging material according to 1) above.

[0015] 4) An edge portion made of the resin constituting the first resin layer and protruding outward is formed at the peripheral portion of the concave engraved portion on the outermost surface of the first resin layer. The packaging material according to 1) above.

[0016] 5) The distance from the peripheral edge of the bottom surface of the concave engraved portion to the protruding end of the edge portion is 0.02 to 0.17 mm. The packaging material according to 4) above.

[0017] 6) Among all of the concave engraved portions, at least a part of the central portion of the bottom surface of the concave engraved portion is raised higher than the peripheral edge of the bottom surface, the packaging material according to 1) above.

[0018] 7) The first resin layer has translucency, and the thickness of the first resin layer is 10 to 50 μm, the packaging material according to 1) above.

[0019] 8) The Martens hardness of the first resin layer is 27 N / mm 2 is as follows, the packaging material according to 1) above.

[0020] 9) The metal foil layer is made of aluminum foil, and the thickness of the metal foil layer is 30 to 200 μm, the packaging material according to 1) above.

[0021] 10) The thickness of the second resin layer is 60 to 500 μm, the packaging material according to 1) above.

[0022] 11) It consists of a bottom wall and a side wall integrally formed in a rising shape from the peripheral edge of the bottom wall, and is cup-shaped with a receiving portion surrounded by the bottom wall and the side wall, and the first resin layer is formed to be located on the outer surface side or the inner surface side of the bottom wall and the side wall using the laminate, the packaging material according to 1) above.

[0023] 12) Contents are placed in the receiving portion of the packaging material according to 11) above, and an opening surrounded by the upper end of the side wall is closed by a lid material, a packaged body.

Advantages of the Invention

[0024] According to the packaging materials of the above 1) to 11), it is composed of a laminate in which a first resin layer, a metal foil layer, and a second resin layer are laminated in this order from one side. On the surface of the laminate on the side of the first resin layer, an identification mark composed of one or more concave engraved portions is provided. In the concave engraved portion, the metal foil layer is deformed into a shape corresponding to the concave engraved portion to form a concave deformed portion. Therefore, even when an external force is received from the outside during storage and transportation of the packaging material, or during storage and transportation of the package using the packaging material, it is possible to suppress the deformation and blurring of the identification mark due to fading. Moreover, the provided identification mark becomes clear, and the clear identification mark is maintained for a relatively long period of time. Further, since the metal foil layer is deformed into a shape corresponding to the concave engraved portion to form a concave deformed portion, even when the content is filled into the accommodating portion of the packaging material, or when the package in which the opening of the packaging material filled with the content in the accommodating portion is closed with a lid material is retorted, the blurring of the identification mark is suppressed.

[0025] Also, when forming the identification mark, by using a device with a relatively simple configuration including a receiving member having a support surface that can be in close contact with the surface of the laminate on the side of the second resin layer, and a pressing member that can engrave the identification mark composed of concave engraved portions on the surface of the laminate on the side of the first resin layer, it becomes possible to form an identification mark with a relatively accurate shape by performing press working in the cold state. Therefore, it is possible to reduce the manufacturing cost compared to the case of forming the convex pattern of the packaging material described in Patent Document 1.

[0026] According to the packaging materials of the above 2) to 6), the provided identification mark becomes even clearer.

[0027] According to the packaging material of the above 6), the periphery of the concave engraved portion looks sharp and the contour of the concave engraved portion becomes distinct, and the identification mark becomes even clearer.

[0028] According to the packaging material of the above 7), since the first resin layer has translucency and the thickness of the first resin layer is 10 to 50 μm, the metal foil layer is sufficiently protected and the identification mark becomes clear.

[0029] According to the packaging material of 8) above, the identification mark composed of the concave engraved portion becomes distinct.

[0030] According to the packaging material of 9) above, since the metal foil layer is made of aluminum foil and the thickness of the metal foil layer is 30 to 200 μm, the concave engraved portion constituting the identification mark can be reliably formed.

[0031] According to the packaging material of 10) above, the back reflection of the identification mark on the surface on the side of the second resin layer can be effectively suppressed.

[0032] On the package of 12) above, various identification marks are clearly provided, and even when an external force is received from the outside during storage and transportation of the package, the unclearization of the identification marks can be suppressed.

Brief Description of the Drawings

[0033]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Embodiments for Carrying Out the Invention

[0034] Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the technical scope of the present invention is not limited by the embodiments shown in the drawings.

[0035] FIG. 1 shows a laminate for forming a cup-shaped packaging material according to the present invention. FIGS. 2 and 3 show the overall configuration of the cup-shaped packaging material according to the present invention, and FIGS. 4 and 5 show the configuration of the main part of the cup-shaped packaging material. FIG. 6 shows the overall configuration of a package using the cup-shaped packaging material shown in FIGS. 2 and 3.

[0036] In each figure, the thickness and ratio of each layer of the laminate for forming the packaging material, and the depth, width, and ratio thereof of the concave engraved portion constituting the identification mark formed on the bottom surface are different from the actual ones for the sake of clarity.

[0037] In FIG. 1, a laminate (1) for forming a packaging material according to the present invention is formed by laminating a first resin layer (2), a metal foil layer (3), and a second resin layer (4) in this order from one side, and an adhesive layer (5) is interposed between the first resin layer (2) and the metal foil layer (3) and between the second resin layer (4) and the metal foil layer (3), respectively.

[0038] The first resin layer (2) is preferably formed of a synthetic resin film having translucency, such as an unstretched film of polyolefin, polyester, polyamide, or the like. Examples of polyolefin include high-density polyethylene (HDPE), low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), homopolypropylene (hPP), propylene-ethylene random copolymer (rPP), propylene-ethylene block copolymer (bPP), and the like. Examples of polyester include polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and polybutylene terephthalate (PBT). An example of polyamide is PA6. The thickness of the first resin layer (2) is preferably 10 to 50 μm, more preferably 25 to 40 μm. If the thickness of the first resin layer (2) is too large, the force is dispersed within the first resin layer (2), so that the force is not accurately transmitted to the metal foil layer (3) and the imprint becomes unclear. If the thickness is too small, the first resin layer (2) is likely to break near the edge portion (22) described later. Further, the Martens hardness of the first resin layer (2) is 27 N / mm 2 or less, preferably, so that the concave imprint portions (21)(210)(211) described later and the concave deformation portions (310)(311) of the metal foil layer (3) can be easily formed. The first resin layer (2) made of a synthetic resin film may be used in combination of two or more synthetic resin films of the same kind or different kinds.

[0039] The metal foil layer (3) is preferably formed from an aluminum foil. As the aluminum foil, it is more preferable to use foils made of aluminum of the 1000 series, 8000 series, or 3000 series specified in JIS H4160:1994, particularly aluminum of the 1000 series or 8000 series, in order to easily form the concave deformation portions (310) and (311) of the metal foil layer (3) described later. Desirably, if a foil made of JIS A8021 material with the Si content limited to 0.10 mass% or less is used, the formability of the cup-shaped packaging material (10) described later will be excellent, and the concave deformation portions (310) and (311) can be formed easily and surely, making the concave imprint portions (21), (210), and (211) clear. Also, when using an aluminum foil, it is preferable that the shiny surface faces the first resin layer (2) side. That is, there is no problem in the case of an aluminum foil with shiny surfaces on both sides, but even in the case of an aluminum foil with a shiny surface on one side and a matte surface on the other side, it should be arranged so that the shiny surface faces the first resin layer (2) side. The thickness of the metal foil layer (3) is preferably 30 to 200 μm, and more preferably 80 to 150 μm. This is because if the thickness of the metal foil layer (3) is too large, the processing of the packaging material (10) described later will become difficult, and if it is too small, defective portions such as pinholes are likely to occur in the metal foil layer (3).

[0040] The second resin layer (4) is preferably formed of a synthetic resin film such as an unstretched film made of polyolefin such as polyethylene or polypropylene. Examples of polyethylene include high-density polyethylene (HDPE) and linear low-density polyethylene (LLDPE), and examples of polypropylene include homopolypropylene (hPP), propylene-ethylene random copolymer (rPP), and propylene-ethylene block copolymer (bPP). The second resin layer (4) made of a synthetic resin film may be formed by combining two or more synthetic resin films of the same or different types, but preferably has a multilayer structure formed by coextruding resins with different melting points. For example, an unstretched film having a three-layer structure composed of rPP, bPP, and rPP, or a polyolefin resin multilayer coextruded film composed of a base resin layer and a seal layer is exemplified. The base resin layer of the polyolefin resin multilayer coextruded film is made of, for example, polypropylene, the seal layer is made of polyethylene and polypropylene, and the difference in melting point between the base resin layer and the seal layer is preferably 10°C or more. The thickness of the second resin layer (4) is preferably 60 to 500 μm, more preferably 80 to 300 μm. If the thickness of the second resin layer (4) is too large, it becomes difficult to make the thickness of each part uniform during the molding of the packaging material (10) described later, and wrinkles are likely to occur. If it is too small, back printing of the concave printing parts (21), (210), and (211) described later is likely to occur.

[0041] The adhesive layer (5) is composed of a two-component curable adhesive such as an olefin-based adhesive, a urethane-based adhesive, or an epoxy-based adhesive, and the thickness is preferably 0.5 to 5 μm, more preferably 2 to 4 μm. If the thickness of the adhesive layer (5) is too large, spots are likely to occur during the coating of the adhesive. If it is too small, delamination is likely to occur due to a decrease in adhesive strength.

[0042] FIG. 2 and FIG. 3 show a specific example of a packaging material made of the laminate (1).

[0043] In FIGS. 2 and 3, the packaging material (10) made of the laminate (1) includes a bottom wall (11), a side wall (12) integrally formed in a rising shape from the periphery of the bottom wall (11), and an outward flange (13) integrally formed in an outward projecting shape at the upper end of the side wall (12). It is cup-shaped and has a receiving portion (14) surrounded by the bottom wall (11) and the side wall (12). In this embodiment, it is made by performing pressing so that the first resin layer (2) of the laminate (1) comes to the outer surface side of the bottom wall (11) and the side wall (12).

[0044] And, an aluminum recycling mark as an identification mark (20) composed of a plurality of concave engraved portions (21)(210)(211) is provided on the lower surface of the bottom wall (11) of the packaging material (10), that is, the surface on the first resin layer (2) side of the laminate (1). In all of the concave engraved portions (21)(210)(211), the metal foil layer (3) of the laminate (1) constituting the packaging material (10) is deformed into a shape corresponding to the concave engraved portion (21), and concave deformed portions (310)(311) described later are formed.

[0045] FIG. 4 is an enlarged cross-sectional view taken in a direction perpendicular to the longitudinal direction of a portion indicated by A in at least a part of all the concave engraved portions (21)(210)(211) constituting the identification mark (20) in FIG. 3, for example, the relatively wide concave engraved portion (210). FIG. 5 is an enlarged cross-sectional view taken in a direction perpendicular to the longitudinal direction of a portion indicated by B in at least a part of all the concave engraved portions (21)(210)(211) constituting the identification mark (20) in FIG. 3, for example, the relatively narrow concave engraved portion (211). In FIGS. 4 and 5, the illustration of the adhesive layer (5) is omitted.

[0046] As shown in Fig. 4, the bottom surface (210a) of the relatively wide concave engraving portion (210) constituting the identification mark (20) is raised so as to be a curved surface that gradually protrudes upward from the periphery toward the central portion. The bottom surface (310a) of the concave deformation portion (310) of the metal foil layer (3) formed corresponding to the concave engraving portion (210) is also raised so as to be a curved surface that gradually protrudes upward from the periphery toward the central portion. The angle X formed by the virtual vertical line (L1) passing through the connecting portion (C) of the bottom surface (310a) and the side surface (310b) of the concave deformation portion (310) of the metal foil layer (3) and the peripheral portion (310c) of a certain width continuous with the connecting portion (C) on the bottom surface (310a) of the concave deformation portion (310) is preferably 90 degrees or less in order to emphasize the edge portion (22) described later and further enhance the visibility, and as a result, make the identification mark (20) clearer.

[0047] In the portion indicated by A in Fig. 3, the side surface (310b) of the concave deformation portion (310) of the metal foil layer (3) has two opposing portions (310d) located on one virtual vertical plane, and the distance between the two virtual vertical lines (L1) passing through the connecting portion (C) of the two opposing portions (310d) and the bottom surface (310a) on the side surface (310b) of the concave deformation portion (310) of the metal foil layer (3) is 1 mm or more. In this case, the angle X formed by the two virtual vertical lines (L1) and the peripheral portion (310c) of a certain width continuous with the connecting portion (C) on the bottom surface (310a) of the concave deformation portion (310) is preferably 70 degrees or more and less than 90 degrees.

[0048] As shown in FIG. 5, the bottom surface (211a) of the relatively narrow concave imprinting portion (211) that constitutes the identification mark (20) is flat. The bottom surface (311a) of the concave deformation portion (311) of the metal foil layer (3) formed corresponding to the concave imprinting portion (211) is also flat. The angle Y formed between the virtual vertical line (L2) passing through the connecting portion (C) of the bottom surface (311a) and the side surface (311b) of the concave deformation portion (311) of the metal foil layer (3), and the peripheral portion (311c) of a certain width continuous with the connecting portion (C) on the bottom surface (311a) of the concave deformation portion (311) is preferably 90 degrees or less in order to emphasize the edge portion (22) described later and further enhance the visibility, and as a result, make the identification mark (20) clearer.

[0049] In the portion indicated by B in FIG. 3, the side surface (311b) of the concave deformation portion (311) of the metal foil layer (3) has two opposing portions (311d) located on one virtual vertical plane, and the distance between the two virtual vertical lines (L2) passing through the connecting portion (C) of the two opposing portions (311d) and the bottom surface (311a) on the side surface (311b) of the concave deformation portion (311) of the metal foil layer (3) is less than 1 mm. In this case, the angle Y formed between the two virtual vertical lines (L2) and the peripheral portion (311d) of a certain width continuous with the connecting portion (C) on the bottom surface (311a) of the concave deformation portion (311) is preferably approximately 90 degrees.

[0050] An edge portion (22) made of the resin that constitutes the first resin layer (2) and protrudes outward may be formed at the peripheral portion of the concave imprinting portions (21)(210)(211) on the outermost surface of the first resin layer (2) of the laminate (1) that constitutes the packaging material (10). In this case, the distance from the peripheral portion of the bottom surface of the concave imprinting portions (210)(211) to the protruding end of the edge portion (22) is preferably 0.02 to 0.17 mm. If this distance is too large, the deformation amount of the entire laminate (1) will become too large, and back printing of the concave imprinting portions (20)(210)(211) is likely to occur. If it is too small, the contour of the concave imprinting portions (20)(210)(211) will become blurred and unclear.

[0051] The manufacturing method of the packaging material (10) is as follows, for example.

[0052] First, the laminate (1) shown in FIG. 1 is subjected to press working such as drawing or overhanging to cause the first resin layer (2) to come to the outer surface side of the bottom wall (11) and the side wall (12), thereby forming a bottom wall (11), a side wall (12) integrally formed rising from the periphery of the bottom wall (11), and an outward flange (13) integrally formed to project outward at the upper end of the side wall (12), and creating a cup-shaped packaging material semi-product having a receiving portion (14) surrounded by the bottom wall (11) and the side wall (12).

[0053] Next, a receiving member having a support surface that can be in close contact with the surface on the second resin layer (4) side of the laminate (1) forming the packaging material (10), and a pressing member capable of engraving an identification mark (20) composed of concave printing portions (21)(210)(211) on the surface on the first resin layer (2) side are prepared. The packaging material semi-product is turned upside down, and the surface on the second resin layer (4) side of the bottom wall (11) of the packaging material semi-product (the surface facing the inside of the receiving portion (14)) is supported by the support surface of the receiving member. In this embodiment, the support surface of the receiving member is a horizontal plane, and the pressing surfaces for forming the respective concave printing portions (21)(210)(211) of the identification mark (20) on the pressing member are also horizontal planes.

[0054] Thereafter, the surface of the first resin layer (2) of the bottom wall (11) of the packaging material (10) is pressed by the entire pressing surface of the pressing member in the cold state to engrave an identification mark (20) composed of concave printing portions (21)(210)(211) on the surface of the first resin layer (2). Thus, the packaging material (10) is manufactured.

[0055] According to the method described above, since the identification mark (20) is formed after the molding of the packaging material (10), distortion of the identification mark (20) of the completed packaging material (10) is suppressed, and the identification mark (20) can be made clear.

[0056] Even if the pressing surface that forms the concave engraved portion (210) of the identification mark (20) on the pressing member is a horizontal surface, as shown in FIG. 4, the bottom surface (210a) of the concave engraved portion (210) is a convex curved surface that gradually protrudes upward from the peripheral portion toward the central portion, but the reason for this is not clear. Naturally, even if the pressing surface that forms the concave engraved portion (210) of the identification mark (20) on the pressing member is a concave curved surface that gradually concaves upward from the peripheral portion toward the central portion, the bottom surface (210a) of the concave engraved portion (210) is a convex curved surface that gradually protrudes upward from the peripheral portion toward the central portion.

[0057] The manufacturing method of the packaging material (10) is not limited to the method described above. When performing press working such as drawing or overhanging forming on the laminate (1) so that the first resin layer (2) comes to the outer surface side of the bottom wall (11) and the side wall (12), the packaging material (10) may be manufactured by simultaneously forming the identification mark (20). In this case, since the man-hours are reduced, it becomes possible to simplify the manufacturing process of the packaging material (10). Further, the packaging material (10) may be manufactured by performing press working such as drawing or overhanging forming on the laminate (1) with the identification mark (20) attached in advance so that the first resin layer (2) comes to the outer surface side of the bottom wall (11) and the side wall (12). In this case, the formation position of the identification mark (20) can be changed according to the customer's request, and the identification mark (20) can be formed at an arbitrary position on the outer surface of the bottom wall (11) and / or the outer surface of the side wall (12) of the cup-shaped packaging material (10).

[0058] FIG. 6 shows a package using the cup-shaped packaging material (10) shown in FIGS. 2 and 3.

[0059] In FIG. 6, the package (40) includes a cup-shaped packaging material (10) and a lid (41). The lid (41) is placed so as to close the opening at the upper end of the packaging material (10), and the peripheral portion is fixed to the flange portion (13) of the packaging material (10) by, for example, heat sealing.

[0060] As shown in FIG. 6, the above-described packaging material (10) is used as a package (40) by placing the contents (not shown) in the storage portion (14) and closing the upper end opening of the storage portion (14) with a lid (41) whose lower surface of the peripheral portion is heat-sealed to the upper surface of the outward flange (13).

[0061] FIGS. 7 and 8 show a first modified example of the concave imprinting portion used for the identification mark provided on the lower surface of the bottom wall (11) of the packaging material (10), that is, the surface on the first resin layer (2) side of the laminate (1), and FIGS. 9 and 9 show a second modified example of the concave imprinting portion.

[0062] The concave imprinting portion (50) shown in FIGS. 7 and 8 is circular when viewed from the opening side of the concave imprinting portion (50), and the bottom surface (50a) of the concave imprinting portion (50) is raised so as to be a curved surface that gradually protrudes upward from the periphery toward the central portion. An edge portion (25) made of the resin constituting the first resin layer (2) and protruding outward may be formed at the peripheral portion of the concave imprinting portion (50) on the outermost surface of the first resin layer (2) constituting the laminate (1) that forms the packaging material. In this case, the distance from the periphery of the bottom surface (50a) of the concave imprinting portion (50) to the protruding end of the edge portion (25) is preferably 0.02 to 0.17 mm.

[0063] The concave deformation part (320) of the metal foil layer (3) formed to correspond to the concave engraving part (50) is also circular when viewed from the opening side of the concave deformation part (320), and its bottom surface (320a) is also raised so as to be a curved surface that gradually protrudes upward from the periphery toward the central part. The side surface (320b) of the concave deformation part (320) of the metal foil layer (3) has two opposing parts (320d) located on a virtual vertical plane on one diameter. The distance between two virtual vertical lines (L3) passing through the connecting part (C) between the two opposing parts (320d) and the bottom surface (320a) on the side surface (320b) of the concave deformation part (320) of the metal foil layer (3) is 1 mm or more. The angle X formed by the virtual vertical line (L3) passing through the connecting part (C) of the bottom surface (320a) and the side surface (320b) of the concave deformation part (320) of the metal foil layer (3) and the peripheral part (320c) of a certain width connected to the connecting part (C) on the bottom surface (320a) of the concave deformation part (320) is preferably 70 degrees or more and less than 90 degrees in order to emphasize the edge part (25) and further enhance the visibility, and as a result, make the identification mark clearer.

[0064] The concave engraving part (60) shown in FIGS. 9 and 10 is arc-shaped when viewed from the opening side of the concave engraving part (60), and the bottom surface (60a) of the concave engraving part (60) is raised so as to be a curved surface that gradually protrudes upward from both side edges in the width direction toward the central part in the width direction. Edge parts (26) made of the resin constituting the first resin layer (2) and protruding outward are formed at both side edge parts in the width direction of the concave engraving part (60) on the outermost surface of the first resin layer (2) of the laminate (1) constituting the packaging material. In this case, the distance from the periphery of the bottom surface (60a) of the concave engraving part (60) to the protruding end of the edge part (26) is preferably 0.02 to 0.17 mm.

[0065] The concave deformation portion (330) of the metal foil layer (3) formed to correspond to the concave engraved portion (60) is also arc-shaped when viewed from the opening side of the concave deformation portion (330), and its bottom surface (330a) is also raised so as to be a curved surface that gradually protrudes upward from both side edges in the width direction toward the central portion in the width direction. The side surface (330b) of the concave deformation portion (330) of the metal foil layer (3) has two opposing portions (330d) located on one virtual vertical plane passing through the centers of curvature of both side edges of the concave deformation portion (330). The distance between two virtual vertical lines (L4) passing through the connecting portion (C) between the two opposing portions (330d) and the bottom surface (330a) on the side surface (330b) of the concave deformation portion (330) of the metal foil layer (3) is 1 mm or more. The angle X formed between the virtual vertical line (L4) passing through the connecting portion (C) of the bottom surface (330a) and the side surface (330b) of the concave deformation portion (330) of the metal foil layer (3) and the peripheral portion (330c) of a certain width continuous with the connecting portion (C) on the bottom surface (330a) of the concave deformation portion (330) is preferably 70 degrees or more and less than 90 degrees in order to emphasize the edge portion (26) and further enhance the visibility, and as a result, make the identification mark clearer.

[0066] In the above-described embodiment, the packaging material according to the present invention is a cup-shaped packaging material, but it is not limited thereto. For example, it may be a sheet-shaped packaging material used to form a pouch, or a sheet-shaped packaging material used for the lid of a cup-shaped packaging material.

Industrial Applicability

[0067] The packaging material according to the present invention is suitably used for a package that packages a fluid content such as pet food or baby food.

Explanation of Reference Numerals

[0068] (1): Laminate, (2): First resin layer, (20): Identification mark, (21)(210)(211)(50)(60): Concave indentation part, (210a)(211a)(50a)(60a) (22)(25)(26): Edge part, (3): Metal foil layer, (310)(311)(320)(330): Concave deformation part, (310a)(311a)(320a)(330a): Bottom surface, (310b)(311b) (320b)(330b): Side surface, (310c)(311c)(320c)(330c): Peripheral part, (310d)(311d)(320d)(330d): Opposing part, (4): Second resin layer, (10): Packaging material, (11): Bottom wall, (12): Side wall, (14): Accommodating part, (50)(60): Concave indentation part, (C): Connection part

Claims

1. The packaging material comprises a laminate in which a first resin layer, a metal foil layer and a second resin layer are laminated in this order from one side, and an identification mark consisting of one or more concave engraved portions is provided on the surface of the laminate facing the first resin layer, and in the concave engraved portions, the metal foil layer is deformed into a shape corresponding to the concave engraved portions to form concave deformed portions.

2. The packaging material according to claim 1, wherein an angle between an imaginary vertical line passing through the connection between the bottom surface and the side surface of the concave deformation portion of the metal foil layer and a peripheral portion of a constant width connected to the connection at the bottom surface of the concave deformation portion is 90 degrees or less.

3. The packaging material described in claim 1, wherein the side of the concave deformation portion of the metal foil layer has two opposing portions located on a single imaginary vertical plane, the distance between two imaginary vertical lines passing through the connection between the two opposing portions on the side of the concave deformation portion of the metal foil layer and the bottom surface is 1 mm or more, and the angle between the two imaginary vertical lines passing through the connection between the two opposing portions and the bottom surface and a peripheral portion of a constant width connected to the connection at the bottom surface of the concave deformation portion is 70 degrees or more and less than 90 degrees.

4. 2. The packaging material according to claim 1, wherein an edge portion made of the resin constituting the first resin layer and protruding outward is formed on the periphery of the concave marking portion on the outermost surface of the first resin layer.

5. 5. The packaging material according to claim 4, wherein the distance from the peripheral edge of the bottom surface of the concave marking portion to the protruding end of the edge portion is 0.02 to 0.17 mm.

6. 2. The packaging material according to claim 1, wherein the central portions of the bottom surfaces of at least some of the concave marking portions are raised higher than the peripheral edges of the bottom surfaces.

7. 2. The packaging material according to claim 1, wherein the first resin layer is translucent and has a thickness of 10 to 50 μm.

8. The Martens hardness of the first resin layer is 27 N / mm ２ 2. The packaging material according to claim 1, wherein:

9. 2. The packaging material according to claim 1, wherein the metal foil layer is made of aluminum foil and has a thickness of 30 to 200 μm.

10. The packaging material according to claim 1, wherein the second resin layer has a thickness of 60 to 500 μm.

11. The packaging material according to claim 1, which is composed of a bottom wall and a side wall integrally molded in a rising shape from the periphery of the bottom wall, is cup-shaped and has a storage section surrounded by the bottom wall and the side wall, and is molded using the laminate so that the first resin layer is located on the outer or inner side of the bottom wall and the side wall.

12. A package according to claim 11, wherein contents are placed in the storage section, and an opening surrounded by the upper ends of the side walls is closed by a lid.

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