Packaging sheet, packaging container, packaging body, and packaging bag

Abstract

To provide a packaging sheet for use in packaging an article, wherein the packaging sheet can detect a metal mixed in the storage space for a packed article or the article itself, with a metal detector.SOLUTION: The present invention discloses a packaging sheet for use in packaging an article, wherein the packaging sheet is composed of at least a paper material layer, a first adhesive layer, a transparent vapor-deposited resin layer, a second adhesive layer, and a thermoplastic resin layer which are laminated in this order from one side to the other side of the packaging sheet. The transparent vapor-deposited resin layer has a resin layer and a non-metal vapor-deposited layer, which is vapor-deposited on the resin layer. The packaging sheet does not have a layer primarily composed of metal.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a packaging sheet used for packaging an article, and also to a packaging container, a package, and a packaging bag using the packaging sheet. [Background technology]

[0002] Various types of packaging are known for items such as food. For example, a packaging container is known that includes a container body that forms a storage space for storing the item and a packaging sheet that is attached to the container body so as to close the storage space. Also known is a package formed by wrapping an item in a packaging sheet. Furthermore, a packaging bag formed using a packaging sheet is also known.

[0003] As described above, packaging sheets used in various packaging forms may require light-blocking properties as a property. Therefore, as shown in Patent Document 1, a packaging sheet configured to have light-blocking properties by including an aluminum vapor deposition layer has been proposed. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-121649 Summary of the Invention [Problem to be solved by the invention]

[0005] However, as described above, in a packaging form using a packaging sheet with an aluminum vapor deposition layer, metal that has become mixed into the space in which the item is stored or into the item itself cannot be detected by a metal detector.

[0006] Therefore, an object of the present invention is to provide a packaging sheet used for packaging items, which allows metal that has become mixed into the storage space of the item or the item itself when the item is packaged to be detected by a metal detector, and to provide a packaging container, a package, and a packaging bag formed using the packaging sheet. [Means for solving the problem]

[0007] The packaging sheet according to the present invention is a packaging sheet used for packaging goods, and is formed by laminating at least a paper layer, a first adhesive layer, a transparent vapor-deposited resin layer, a second adhesive layer, and a thermoplastic resin layer in this order from one side of the packaging sheet to the other side, and the transparent vapor-deposited resin layer comprises a resin layer and a non-metallic vapor-deposited layer vapor-deposited on the resin layer, and does not comprise a layer whose main component is metal.

[0008] According to this configuration, the transparent vapor-deposited resin layer includes a resin layer and a non-metallic vapor-deposited layer vapor-deposited on the resin layer, and the packaging sheet does not include a layer primarily composed of metal. This allows metals mixed in the storage space of the item or the item itself to be detected with a metal detector when the item is packaged using the packaging sheet. Furthermore, the paper layer provides light-blocking properties.

[0009] There may be a clear cellophane layer forming one side of the wrapping sheet and in contact with the paper layer.

[0010] According to this configuration, the transparent cellophane layer forming one side of the packaging sheet is in contact with the paper layer, so that the paper layer can be seen from one side of the packaging sheet and the transparent cellophane layer can protect the paper layer, thereby improving and maintaining the design of the packaging sheet.

[0011] A light-shielding layer using ink may be provided between the paper layer and the first adhesive layer.

[0012] According to this configuration, by providing a light-shielding layer using ink between the paper layer and the first adhesive layer, a packaging sheet with better light-shielding properties can be obtained.

[0013] The packaging container of the present invention is a packaging container using the above-mentioned packaging sheet, and is provided with a container body that forms a storage space for storing items, and the storage space is formed by closing the packaging sheet so that one side of the packaging sheet is facing outward.

[0014] The packaging body according to the present invention is formed by wrapping an article in the packaging sheet described above.

[0015] The packaging bag according to the present invention is formed from the above packaging sheet. [Effects of the Invention]

[0016] As described above, the present invention provides a packaging sheet for use in packaging an item, which allows metal contained in the storage space of the item or the item itself to be detected by a metal detector while the item is packaged. It also provides a packaging container, a package, and a packaging bag formed using the packaging sheet. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a cross-sectional view of a packaging sheet according to a first embodiment of the present invention. [Figure 2] FIG. 4 is a cross-sectional view of a packaging sheet according to a second embodiment of the present invention. [Figure 3] FIG. 4 is a cross-sectional view of a packaging sheet according to a third embodiment of the present invention. [Figure 4] FIG. 10 is a cross-sectional view of a packaging sheet according to a fourth embodiment of the present invention. [Figure 5] 1 is a cross-sectional view showing a packaging container formed using a packaging sheet according to each embodiment. [Figure 6] FIG. 1 is a perspective view showing a package formed using the packaging sheet according to each embodiment. [Figure 7]FIG. 1 is a perspective view showing a packaging bag formed using the packaging sheet according to each embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, an embodiment of the packaging sheet according to the present invention will be described with reference to the drawings. In the following drawings, the same or corresponding parts are designated by the same reference characters, and description thereof will not be repeated.

[0019] First Embodiment As shown in FIG. 1 , the packaging sheet 10 according to this embodiment is formed by laminating at least a paper layer 1, a first adhesive layer 2, a transparent vapor-deposited resin layer 3, a second adhesive layer 4, and a thermoplastic resin layer 5 in this order from one side to the other. The packaging sheet 10 does not include a layer containing metal as a main component. Specifically, one side of the packaging sheet 10 is formed by the paper layer 1, and the other side is formed by the thermoplastic resin layer 5. The paper layer 1 and the transparent vapor-deposited resin layer 3 are in contact with the first adhesive layer 2, and the transparent vapor-deposited resin layer 3 and the thermoplastic resin layer 5 are in contact with the second adhesive layer 4.

[0020] One side of the paper layer 1 forms one side of the packaging sheet 10, and the other side is in contact with the first adhesive layer 2. The thickness of the paper layer 1 is not particularly limited. The basis weight of the paper sheet constituting the paper layer 1 is preferably 5 g / m 2 More than 200g / m 2 Less than 10 g / m, more preferably 2 More than 180g / m 2 The paper sheet is not particularly limited, and examples that can be used include fine paper, rayon paper, paper coated or impregnated with a barrier coating agent, white cardboard, ivory paper, milk carton base paper, cup base paper, etc. By providing the paper material layer 1, it is possible to improve the light blocking properties compared to when a transparent resin layer is provided instead of the paper material layer 1.

[0021] An ink layer (not shown) on which letters, designs, etc. are printed may be formed on one surface of the paper layer 1 (the surface that forms one surface of the packaging sheet 10). By forming an ink layer on one surface of the paper layer 1 (the surface that forms one surface of the packaging sheet 10), it is possible to obtain the texture (feel of material) of paper when viewing the packaging sheet 10 from one side, and also to visually recognize the letters, designs, etc. printed on the ink layer.

[0022] The first adhesive layer 2 bonds the paper layer 1 and the transparent vapor-deposited resin layer 3. The second adhesive layer 4 bonds the transparent vapor-deposited resin layer 3 and the thermoplastic resin layer 5. The thickness of the first adhesive layer 2 and the second adhesive layer 4 is not particularly limited, but is preferably 0.1 μm or more, and preferably 50 μm or less, more preferably 40 μm or less, and even more preferably 30 μm or less. The first adhesive layer 2 and the second adhesive layer 4 may be adhesive layers or adhesive resin layers.

[0023] The adhesive layer can be formed by a conventionally known method. For example, the adhesive layer can be formed by a dry lamination method. In the dry lamination method, an adhesive is applied to a sheet material that forms one of the two layers to be bonded and then dried. Then, one sheet material and the other sheet material are laminated via the dried adhesive layer and heated and pressed together, thereby bonding the two layers with the adhesive layer. The adhesive to be applied is not particularly limited, and examples of adhesives that can be used include one-component or two-component curable or non-curable vinyl, (meth)acrylic, polyamide, polyester, polyether, polyurethane, epoxy, rubber, and other solvent-based, water-based, or emulsion-based adhesives. Two-component curable adhesives can be cured products of polyols and isocyanate compounds. The adhesive application method is not particularly limited, and examples of adhesives that can be used include direct gravure roll coating, gravure roll coating, kiss coating, reverse roll coating, Fountain coating, and transfer roll coating.

[0024] The adhesive resin layer can be formed by a conventional method, such as melt extrusion lamination or sand lamination. The adhesive resin layer contains a thermoplastic resin. Examples of the thermoplastic resin include polyethylene resins, polypropylene resins, cyclic polyolefin resins, and copolymer resins, modified resins, or mixtures (including alloys) containing these resins as the main component. Examples of polyethylene resins include low-density polyethylene (LDPE), medium-density polyethylene (MDPE), high-density polyethylene (HDPE), and linear low-density polyethylene (LLDPE). Examples of cyclic polyolefin resins include ethylene-propylene copolymers, and cyclic polyolefins such as polymethylpentene, polybutene, and polynorbornene. These resins can be used alone or in combination. The adhesive resin layer can also be formed from a film formed using the above resins. Examples of such films include unstretched films, uniaxially stretched films, and biaxially stretched films.

[0025] The thickness of the transparent vapor-deposited resin layer 3 is not particularly limited, but is preferably 5 μm or more and 50 μm or less, and more preferably 8 μm or more and 40 μm or less. The transparent vapor-deposited resin layer 3 comprises a resin layer 3a and a non-metallic vapor-deposited layer 3b vapor-deposited on the resin layer 3a. The resin constituting the resin layer 3a is not particularly limited, and examples thereof include polyethylene terephthalate resin, nylon resin, and polyvinyl chloride resin. The resin layer 3a may also be a film formed using such a resin. Examples of such films include unstretched films, uniaxially stretched films, and biaxially stretched films. Examples of components constituting the non-metallic vapor-deposited layer 3b include silicon dioxide. In other words, the transparent vapor-deposited resin layer 3 can be a transparent vapor-deposited film in which a non-metallic component is vapor-deposited on the above-mentioned resin film.

[0026] The transparent vapor deposition film preferably has an oxygen permeability of 0.1 cc / m 2 ·atm·day or more 20cc / m 2The transparent vapor deposition film preferably has a water vapor permeability of 0.1 g / m 2 ·day or more 20g / m 2 ·day or less. The oxygen permeability is measured in accordance with JIS K 7126-2, and the water vapor permeability can be measured in accordance with JIS K 7129-2.

[0027] One surface of the thermoplastic resin layer 5 contacts the second adhesive layer 4, and the other surface forms the other surface of the packaging sheet 10. The thickness of the thermoplastic resin layer 5 is not particularly limited and is preferably 5 μm to 100 μm, more preferably 10 μm to 90 μm, and even more preferably 15 μm to 80 μm. The thermoplastic resin layer 5 constitutes a sealant layer that enables the packaging sheet 10 to be heat-sealed when forming the packaging form described below. The resin that constitutes the thermoplastic resin layer 5 is not particularly limited and includes, for example, polyethylene resin, polypropylene resin, polyvinyl chloride resin, etc. The thermoplastic resin layer 5 may also be a film formed using these resins. Such a film may be a non-stretched film, a uniaxially stretched film, a biaxially stretched film, etc.

[0028] Second Embodiment The packaging sheet 10 according to this embodiment differs from the first embodiment in that it includes a transparent cellophane layer 6, as shown in Fig. 2. Therefore, the differences from the first embodiment will be described below.

[0029] The transparent cellophane layer 6 forms one side of the packaging sheet and is in contact with the paper layer 1. Specifically, one side of the transparent cellophane layer 6 forms one side of the packaging sheet, and the other side of the transparent cellophane layer 6 is in contact with the paper layer 1.

[0030] The cellophane that constitutes the transparent cellophane layer 6 is made primarily from pulp (sulfite pulp) made by chemically processing wood. This pulp is then chemically processed to create a solution called viscose, which is then solidified again to form a regenerated cellulose film. Examples of cellophane that constitutes the transparent cellophane layer 6 include regular cellophane and moisture-proof cellophane. Examples of regular cellophane include 70-90% recycled cellulose, 2-20% polyhydric alcohol (softener), and 6-15% moisture. Examples of moisture-proof cellophane include regular cellophane coated with a moisture-proof coating.

[0031] The thickness of the transparent cellophane layer 6 is not particularly limited, and is preferably, for example, 5 μm or more and 50 μm or less.

[0032] An ink layer (not shown) on which letters, designs, etc. are printed may be formed on the other surface (the surface on the paper layer 1 side) of the transparent cellophane layer 6. By forming an ink layer on the other surface (the surface on the paper layer 1 side) of the transparent cellophane layer 6, the ink layer and the paper layer 1 can be seen through the transparent cellophane layer 6 when the packaging sheet 10 is viewed from one side. Therefore, the letters, designs, etc. on the ink layer can be seen and the ink layer can be protected while retaining the texture (feel) of the paper.

[0033] Third and Fourth Embodiments The packaging sheet 10 according to the third embodiment differs from the first embodiment in that it includes a light-shielding layer 7, as shown in Fig. 3. The packaging sheet 10 according to the third embodiment also differs from the second embodiment in that it includes a light-shielding layer 7, as shown in Fig. 4. Therefore, the differences from the first and second embodiments will be described below.

[0034] In the third and fourth embodiments, the light-shielding layer 7 is formed between the paper layer 1 and the first adhesive layer 2. Specifically, the light-shielding layer 7 is formed by applying ink to the other surface of the paper layer 1. The color of the ink that forms the light-shielding layer 7 is not particularly limited, and examples include white and black. The thickness of the light-shielding layer 7 is not particularly limited, and is preferably 0.1 μm or more and 10 μm or less, more preferably 0.2 μm or more and 8 μm or less, and even more preferably 0.3 μm or more and 8 μm or less.

[0035] The form in which an article such as food is packaged using the packaging sheet 10 configured as in each of the above embodiments is not particularly limited, and an example thereof is a packaging container 100 for containing an article X, as shown in FIG. 5. The packaging container 100 includes a container body 100a that forms a storage space R for storing the article X. With the article X stored in the storage space R, the packaging sheet 10 is attached to the container body 100a so as to close an opening 100b of the container body 100a, thereby forming the packaging container 100. In the packaging container 100, the packaging sheet 10 is attached to the container body 100a so that one surface (specifically, the paper layer 1 in the first and third embodiments, and the transparent cellophane layer 6 in the second and fourth embodiments) faces outward.

[0036] Another example of packaging an item using the packaging sheet 10 is a package 200 formed by wrapping an item X with the packaging sheet 10, as shown in Fig. 6. The package 200 is formed by wrapping the item X with the packaging sheet 10 in a shape that conforms to the shape of the item X, with one side (specifically, the paper layer 1 in the first and third embodiments, and the transparent cellophane layer 6 in the second and fourth embodiments) facing outward.

[0037] Another example of a packaging form for an article using the packaging sheet 10 is a packaging bag 300 in which the packaging sheet 10 is formed into a bag shape with one side (specifically, the paper layer 1 in the first and third embodiments, and the transparent cellophane layer 6 in the second and fourth embodiments) facing outward, as shown in Fig. 7. Another example of a packaging form for an article using the packaging sheet 10 is a bag (not shown) formed by pillow packaging with one side (specifically, the paper layer 1 in the first and third embodiments, and the transparent cellophane layer 6 in the second and fourth embodiments) of the packaging sheet 10 facing outward.

[0038] As described above, the packaging sheet 10, packaging container 100, packaging body 200, and packaging bag 300 according to this embodiment can detect metal that has entered the storage space for item X or the item X itself using a metal detector when the item X is packaged therein.

[0039] That is, the transparent vapor-deposited resin layer 3 comprises a resin layer and a non-metallic vapor-deposited layer vapor-deposited on the resin layer, and the packaging sheet 10 does not comprise a layer mainly composed of metal. As a result, when the product X is packaged using the packaging sheet 10, metal that has entered the storage space for the product X or the product X itself can be detected with a metal detector. Furthermore, the paper material layer 1 provides light-blocking properties.

[0040] Furthermore, the transparent cellophane layer 6 forming one side of the packaging sheet 10 is in contact with the paper layer 1, so that the paper layer 1 can be seen from one side of the packaging sheet 10, and the transparent cellophane layer 6 can protect the paper layer 1. This allows the design of the packaging sheet 10 to be improved and maintained.

[0041] Furthermore, by providing a light-shielding layer 7 using ink between the paper layer 1 and the first adhesive layer 2, it is possible to obtain a packaging sheet 10 with better light-shielding properties.

[0042] The packaging sheet, packaging container, and packaging body according to the present invention are not limited to the above-described embodiments, and various modifications are possible without departing from the spirit of the present invention. Furthermore, the configurations, methods, etc. of the above-described multiple embodiments may be arbitrarily adopted and combined (the configurations, methods, etc. of one embodiment may be applied to the configurations, methods, etc. of other embodiments), and further, it goes without saying that the configurations, methods, etc. of the various modified examples described below may be arbitrarily selected and adopted in the configurations, methods, etc. of the above-described embodiments.

[0043] For example, in the above embodiment, the light-shielding layer 7 is formed between the paper layer 1 and the first adhesive layer 2, but this is not limiting, and for example, the paper layer 1 may be configured to function as the light-shielding layer 7. Specifically, the paper layer 1 may function as the light-shielding layer 7 by being impregnated with ink such as white or black.

[0044] In each of the above embodiments, other layers may be disposed between the layers. [Explanation of symbols]

[0045] 1...paper layer, 1...paper layer, 2...first adhesive layer, 3...transparent vapor-deposited resin layer, 3a...resin layer, 3b...non-metallic vapor-deposited layer, 4...second adhesive layer, 5...thermoplastic resin layer, 6...transparent cellophane layer, 7...light-shielding layer, 10...packaging sheet, 100...packaging container, 100a...container body, 100b...opening, 200...packaging body, 300...packaging bag, R...storage space, X...article

Claims

[Claim 1] A packaging sheet used to package an item, The packaging sheet is formed by laminating at least a paper layer, a first adhesive layer, a transparent vapor-deposited resin layer, a second adhesive layer, and a thermoplastic resin layer in this order from one side to the other side of the packaging sheet, The transparent vapor-deposited resin layer includes a resin layer and a non-metallic vapor-deposited layer vapor-deposited on the resin layer, It does not have a layer mainly composed of metal, The paper layer is impregnated with ink so as to function as a light-shielding layer, and letters or designs are printed on one side of the packaging sheet; a transparent cellophane layer that forms one side of the packaging sheet and is in contact with the paper layer; The packaging sheet is formed by providing a light-shielding layer using ink between the paper layer and the first adhesive layer. packaging bag.

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