Cushioning material for packaging

Abstract

To provide a cushioning material for packing which does not require a plurality of cushioning materials for packing corresponding to the shape and the number of articles to be packed, and can surely fix and pack the articles to be packed only by one cushioning material for packing.SOLUTION: The cushioning material 1 for packing includes at least a bag body 3, and the bag body 3 is made of a resin film 4 including a first layer containing a thermoplastic resin and a lubricant.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a cushioning material for packaging. [Background technology]

[0002] Conventionally, when packing and transporting items (packaged items) in packaging containers such as cardboard boxes, workers would protect each packaged item by wrapping it in newspaper or the like, and fill any gaps between the items and the cardboard boxes with cushioning materials such as polystyrene foam, air bubbles, or newspaper before transporting them.

[0003] However, this type of packaging method requires multiple cushioning materials depending on the shape and number of items to be packaged, which is time-consuming.

[0004] Therefore, instead of these cushioning materials, cushioning packaging materials have been proposed for securing and transporting items. More specifically, for example, an airtight bag has been proposed as a cushioning packaging material that is formed by overlapping two flexible synthetic resin films with high gas barrier properties, with the peripheries of the synthetic resin films heat-sealed and equipped with plugs for injecting and discharging air, allowing it to expand and contract (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 8-217151 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the cushioning material described in Patent Document 1 simply expands into a spherical shape when air is supplied, and is configured to press the packaged item from only one direction (upward), making it vulnerable to vibrations in the left-right direction of the packaged item when transporting it, and unable to sufficiently secure the packaged item. Therefore, there remains the problem that multiple cushioning materials are required depending on the shape and number of the packaged items.

[0007] Therefore, the present invention has been made in consideration of the above problems, and aims to provide a cushioning material for packaging that can securely fix and package an item using only one cushioning material, eliminating the need for multiple cushioning materials for packaging depending on the shape and number of the items to be packaged. [Means for solving the problem]

[0008] In order to achieve the above-mentioned object, the packaging cushioning material of the present invention is a packaging cushioning material comprising at least a bag body, characterized in that the bag body is made of a resin film comprising a first layer containing a thermoplastic resin and a lubricant. [Effects of the Invention]

[0009] According to the present invention, it is possible to securely fix and package an object to be packed using only one cushioning material, regardless of the shape or number of the object to be packed. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a plan view showing a cushioning material for packaging according to a first embodiment of the present invention. [Figure 2] 2 is a cross-sectional view taken along the line AA in FIG. 1. [Figure 3] 1 is a perspective view showing a cushioning material for packaging according to a first embodiment of the present invention. [Figure 4] 1 is a cross-sectional view showing a resin film forming a bag according to a first embodiment of the present invention. [Figure 5] 1A to 1C are diagrams illustrating a method for manufacturing a cushioning material for packaging according to a first embodiment of the present invention. [Figure 6] 1A to 1C are diagrams illustrating a method for manufacturing a cushioning material for packaging according to a first embodiment of the present invention. [Figure 7] 1A to 1C are diagrams illustrating a method for manufacturing a cushioning material for packaging according to a first embodiment of the present invention. [Figure 8] 1A to 1C are diagrams illustrating a method for manufacturing a cushioning material for packaging according to a first embodiment of the present invention. [Figure 9] 1A to 1C are diagrams illustrating a method for manufacturing a cushioning material for packaging according to a first embodiment of the present invention. [Figure 10] 1 is a side view showing a cushioning material for packaging according to a first embodiment of the present invention. [Figure 11] 1 is a side view showing a cushioning material for packaging according to a first embodiment of the present invention. [Figure 12] 1 is a side view showing a cushioning material for packaging according to a first embodiment of the present invention. [Figure 13] 1A to 1C are diagrams illustrating a method for packaging an object using a cushioning material for packaging according to a first embodiment of the present invention. [Figure 14] 1A to 1C are diagrams illustrating a method for packaging an object using a cushioning material for packaging according to a first embodiment of the present invention. [Figure 15] 1A to 1C are diagrams illustrating a method for packaging an object using a cushioning material for packaging according to a first embodiment of the present invention. [Figure 16] 1A to 1C are diagrams illustrating a method for packaging an object using a cushioning material for packaging according to a first embodiment of the present invention. [Figure 17] 1A to 1C are diagrams illustrating a method for packaging an object using a cushioning material for packaging according to a first embodiment of the present invention. [Figure 18] 1A to 1C are diagrams illustrating a method for packaging an object using a cushioning material for packaging according to a first embodiment of the present invention. [Figure 19] 1 is a perspective view showing a state in which a bag body of a cushioning material for packaging according to a first embodiment of the present invention is inflated. [Figure 20] FIG. 4 is a plan view showing a cushioning material for packaging according to a second embodiment of the present invention. [Figure 21]21 is a cross-sectional view of FIG. 20 taken along line B-B. [Figure 22] FIG. 10 is a perspective view showing a cushioning material for packaging according to a second embodiment of the present invention. [Figure 23] 6A to 6C are diagrams illustrating a method for manufacturing a cushioning material for packaging according to a second embodiment of the present invention. [Figure 24] 6A to 6C are diagrams illustrating a method for manufacturing a cushioning material for packaging according to a second embodiment of the present invention. [Figure 25] 6A to 6C are diagrams illustrating a method for manufacturing a cushioning material for packaging according to a second embodiment of the present invention. [Figure 26] FIG. 4 is a side view showing a cushioning material for packaging according to a second embodiment of the present invention. [Figure 27] 10A and 10B are diagrams illustrating a method for packaging an object using a cushioning material for packaging according to a second embodiment of the present invention. [Figure 28] 10A and 10B are diagrams illustrating a method for packaging an object using a cushioning material for packaging according to a second embodiment of the present invention. [Figure 29] FIG. 10 is a plan view showing a cushioning material for packaging according to a third embodiment of the present invention. [Figure 30] FIG. 10 is a perspective view showing a cushioning material for packaging according to a third embodiment of the present invention. [Figure 31] 29 is a cross-sectional view taken along CC in FIG. [Figure 32] 10A to 10C are diagrams illustrating a method for manufacturing a cushioning material for packaging according to a third embodiment of the present invention. [Figure 33] 10A to 10C are diagrams illustrating a method for manufacturing a cushioning material for packaging according to a third embodiment of the present invention. [Figure 34] 10A to 10C are diagrams illustrating a method for manufacturing a cushioning material for packaging according to a third embodiment of the present invention. [Figure 35] 10A to 10C are diagrams illustrating a method for manufacturing a cushioning material for packaging according to a third embodiment of the present invention. [Figure 36] 10A to 10C are diagrams illustrating a method for manufacturing a cushioning material for packaging according to a third embodiment of the present invention. [Figure 37] FIG. 10 is a side view showing a cushioning material for packaging according to a third embodiment of the present invention. [Figure 38] FIG. 10 is a side view showing a cushioning material for packaging according to a third embodiment of the present invention. [Figure 39] 10A and 10B are diagrams illustrating a method for packaging an object using a cushioning material for packaging according to a third embodiment of the present invention. [Figure 40] 10A and 10B are diagrams illustrating a method for packaging an object using a cushioning material for packaging according to a third embodiment of the present invention. [Figure 41] 10A and 10B are diagrams illustrating a method for packaging an object using a cushioning material for packaging according to a third embodiment of the present invention. [Figure 42] FIG. 10 is a perspective view showing a state in which a bag body of a cushioning material for packaging according to a third embodiment of the present invention is inflated. [Figure 43] FIG. 10 is a plan view showing a cushioning material for packaging according to a fourth embodiment of the present invention. [Figure 44] FIG. 44 is a cross-sectional view taken along the line DD in FIG. 43. [Figure 45] FIG. 10 is a perspective view showing a cushioning material for packaging according to a fourth embodiment of the present invention. [Figure 46] 10A to 10C are diagrams illustrating a method for manufacturing a cushioning material for packaging according to a fourth embodiment of the present invention. [Figure 47] 10A to 10C are diagrams illustrating a method for manufacturing a cushioning material for packaging according to a fourth embodiment of the present invention. [Figure 48] 10A to 10C are diagrams illustrating a method for manufacturing a cushioning material for packaging according to a fourth embodiment of the present invention. [Figure 49] 10A to 10C are diagrams illustrating a method for manufacturing a cushioning material for packaging according to a fourth embodiment of the present invention. [Figure 50] 10A and 10B are diagrams illustrating a method for packaging an object using a cushioning material for packaging according to a fourth embodiment of the present invention. [Figure 51] 10A and 10B are diagrams illustrating a method for packaging an object using a cushioning material for packaging according to a fourth embodiment of the present invention. [Figure 52] 10A and 10B are diagrams illustrating a method for packaging an object using a cushioning material for packaging according to a fourth embodiment of the present invention. [Figure 53]FIG. 10 is a perspective view showing a state in which a bag body of a cushioning material for packaging according to a fourth embodiment of the present invention is inflated. [Figure 54] 10A and 10B are diagrams illustrating a cushioning material for packaging according to a modified example of the present invention. [Figure 55] FIG. 10 is a plan view showing a cushioning material for packaging according to a fifth embodiment of the present invention. [Figure 56] 56 is a cross-sectional view of FIG. 55 taken along line E-E. [Figure 57] FIG. 56 is a cross-sectional view of FIG. 55 shown in FIG. [Figure 58] FIG. 10 is a perspective view showing a cushioning material for packaging according to a fifth embodiment of the present invention. [Figure 59] 10A to 10C are diagrams illustrating a method for manufacturing a cushioning material for packaging according to a fifth embodiment of the present invention. [Figure 60] 10A to 10C are diagrams illustrating a method for manufacturing a cushioning material for packaging according to a fifth embodiment of the present invention. [Figure 61] 10A to 10C are diagrams illustrating a method for manufacturing a cushioning material for packaging according to a fifth embodiment of the present invention. [Figure 62] 10A to 10C are diagrams illustrating a method for manufacturing a cushioning material for packaging according to a fifth embodiment of the present invention. [Figure 63] 10A to 10C are diagrams illustrating a method for manufacturing a cushioning material for packaging according to a fifth embodiment of the present invention. [Figure 64] 10A to 10C are diagrams illustrating a method for manufacturing a cushioning material for packaging according to a fifth embodiment of the present invention. [Figure 65] FIG. 10 is a side view showing a cushioning material for packaging according to a fifth embodiment of the present invention. [Figure 66] 10A and 10B are diagrams illustrating a method for packaging an object using a cushioning material for packaging according to a fifth embodiment of the present invention. [Figure 67] 10A and 10B are diagrams illustrating a method for packaging an object using a cushioning material for packaging according to a fifth embodiment of the present invention. [Figure 68] 10A and 10B are diagrams illustrating a method for packaging an object using a cushioning material for packaging according to a fifth embodiment of the present invention. [Figure 69]10A and 10B are diagrams illustrating a method for packaging an object using a cushioning material for packaging according to a fifth embodiment of the present invention. [Figure 70] FIG. 70 is a cross-sectional view of FIG. 69 taken along the line H-H. [Figure 71] This is a cross-sectional view II of Figure 69. [Figure 72] 10A and 10B are diagrams illustrating a method for packaging an object using a cushioning material for packaging according to a fifth embodiment of the present invention. [Figure 73] 10A and 10B are diagrams illustrating a method for packaging an object using a cushioning material for packaging according to a fifth embodiment of the present invention. [Figure 74] 72 and 73 are plan views viewed from the Z direction. [Figure 75] FIG. 10 is a plan view showing a cushioning material for packaging according to a sixth embodiment of the present invention. [Figure 76] FIG. 76 is a cross-sectional view of FIG. [Figure 77] FIG. 10 is a perspective view showing a cushioning material for packaging according to a sixth embodiment of the present invention. [Figure 78] 10A to 10C are diagrams illustrating a method for manufacturing a cushioning material for packaging according to a sixth embodiment of the present invention. [Figure 79] 10A to 10C are diagrams illustrating a method for manufacturing a cushioning material for packaging according to a sixth embodiment of the present invention. [Figure 80] 10A to 10C are diagrams illustrating a method for manufacturing a cushioning material for packaging according to a sixth embodiment of the present invention. [Figure 81] 10A to 10C are diagrams illustrating a method for manufacturing a cushioning material for packaging according to a sixth embodiment of the present invention. [Figure 82] FIG. 10 is a side view showing a cushioning material for packaging according to a sixth embodiment of the present invention. [Figure 83] 10A and 10B are diagrams illustrating a method for packaging an object using a cushioning material for packaging according to a sixth embodiment of the present invention. [Figure 84] 10A and 10B are diagrams illustrating a method for packaging an object using a cushioning material for packaging according to a sixth embodiment of the present invention. [Figure 85] 10A and 10B are diagrams illustrating a method for packaging an object using a cushioning material for packaging according to a sixth embodiment of the present invention. [Figure 86] 10A and 10B are diagrams illustrating a method for packaging an object using a cushioning material for packaging according to a sixth embodiment of the present invention. [Figure 87] 10A and 10B are diagrams illustrating a method for packaging an object using a cushioning material for packaging according to a sixth embodiment of the present invention. [Figure 88] 10A and 10B are diagrams illustrating a method for packaging an object using a cushioning material for packaging according to a sixth embodiment of the present invention. [Figure 89] 88. FIG. 88 is a cross-sectional view of FIG. [Figure 90] FIG. 89 is a cross-sectional view of FIG. 88 taken along the line K-K. [Figure 91] 13A and 13B are diagrams illustrating modified examples of the bag body in the cushioning material for packaging according to the sixth embodiment of the present invention. [Figure 92] 13A and 13B are diagrams illustrating modified examples of the bag body in the cushioning material for packaging according to the sixth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0011] The cushioning material for packaging of the present invention will be specifically described below. Note that the present invention is not limited to the following embodiments, and can be appropriately modified and applied within the scope of the present invention.

[0012] [First embodiment] Fig. 1 is a plan view showing the cushioning material for packaging according to this embodiment, and Fig. 2 is a cross-sectional view taken along line AA in Fig. 1. Fig. 3 is a perspective view showing the cushioning material for packaging according to this embodiment, and Fig. 4 is a cross-sectional view showing a resin film forming a bag body according to this embodiment.

[0013] As shown in FIGS. 1 to 3, the cushioning material for packaging 1 of this embodiment includes a base material 2 and a bag body 3, and the bag body 3 is attached to the base material 2 at a surface 3s of the bag body 3.

[0014] This cushioning packaging material 1 is used in a state where it is housed in a packaging container such as a box or bag (for example, a cardboard box) made of paper or resin when transporting an article (item to be packed).

[0015] <Base material> Examples of the substrate 2 include paper substrates such as corrugated cardboard, thick paper, kraft paper, and waterproof paper, and plastic substrates made of resins such as polypropylene, such as plastic cardboard, cardboard plate, and plastic corrugated cardboard. Laminated paper, in which a thermoplastic resin such as polyethylene is laminated onto a paper substrate, may also be used.

[0016] The thickness of the substrate 2 is not particularly limited and is, for example, 0.5 to 10 mm.

[0017] Furthermore, although the base material 2 has a rectangular shape in a plan view, it is not limited to this shape and may be, for example, a square, a circle, an oval, etc., and can be appropriately selected according to the shape of the packaged item and the shape of the packaging container.

[0018] <Bag body> The bag body 3 in the cushioning material for packaging 1 of this embodiment is formed from a bag-shaped resin film 4 that forms the main body of the bag body 3, and includes a space 5 formed inside the resin film 4. The bag body 3 is also fitted with an air supply unit 10 for inflating the bag body 3, and the bag body 3 is configured to inflate when air is supplied to the space 5 of the bag body 3 by the air supply unit 10.

[0019] Furthermore, the thickness of the resin film 4 forming the bag body 3 is not particularly limited, but from the viewpoints of reducing costs, improving flexibility, and facilitating deformation when air is supplied, it is preferably 10 to 100 μm, more preferably 15 to 80 μm, even more preferably 20 to 50 μm, and particularly preferably 25 to 45 μm.

[0020] Furthermore, like the base material 2 described above, the bag body 3 has a rectangular shape when viewed in a plane, but is not limited to these shapes and may be square, circular, elliptical, etc., and can be selected appropriately depending on the shape of the item to be packed and the shape of the packaging container.

[0021] As shown in FIG. 4, the resin film 4 includes a first surface layer 6 (hereinafter sometimes simply referred to as "surface layer 6") which is a first layer, a second surface layer 7 (hereinafter sometimes simply referred to as "surface layer 7") which is a second layer provided on one side of the surface layer 6, and an intermediate layer 8 provided between the surface layer 6 and the surface layer 7, and has a three-layer structure composed of the intermediate layer 8 and the surface layers 6 and 7 laminated on the surface of the intermediate layer 8, laminated in the order of surface layer / intermediate layer / surface layer.

[0022] (Surface layer) Each of the surface layers 6 and 7 is formed from a thermoplastic resin composition containing a thermoplastic resin and a lubricant.

[0023] Examples of thermoplastic resins include olefin-based resins such as polyethylene-based resins and polypropylene-based resins, and styrene-based resins such as styrene-based elastomers. From the viewpoint of improving the flexibility of the surface layers 6 and 7, polyethylene-based resins are preferred, and from the viewpoint of improving the heat resistance of the surface layers 6 and 7, polypropylene-based resins are preferred.

[0024] For example, polyethylene resins include high-density polyethylene (HDPE), medium-density polyethylene (MDPE), low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), and very low-density polyethylene (ULDPE, VLDPE). Among these, low-density polyethylene (density: 0.91 to 0.93 g / cm) is preferred from the viewpoint of improving flexibility. 3 ) is preferred, and from the viewpoint of improving flexibility and heat sealability, linear low-density polyethylene (density: 0.910 to 0.920 g / cm 3 ) or ultra-low density polyethylene (density: 0.880 to 0.915 g / cm 3) is preferable. From the viewpoint of low cost, high density polyethylene (density: 0.910 to 0.955 g / cm 3 ) is preferred.

[0025] Furthermore, examples of polyethylene resins include ethylene-α-olefin copolymers in which ethylene is copolymerized with an α-olefin having 4 or more carbon atoms. Examples of α-olefins having 4 or more carbon atoms include propylene, 1-butene, 4-methylpentene-1, hexene, and octene. From the viewpoint of improving flexibility, the density of the ethylene-α-olefin copolymer is preferably 0.850 to 0.910 g / cm. 3 Moreover, examples of the ethylene-α-olefin copolymer include an ethylene-α-olefin copolymer elastomer, which is one of the ethylene-based elastomers described below.

[0026] Further, for example, polypropylene-based resins include homopolypropylene (H-PP) obtained by polymerizing propylene alone, random polypropylene (R-PP) obtained by copolymerizing propylene with ethylene, and block polypropylene (block polypropylene copolymerized with ethylene, B-PP) obtained by polymerizing homopolypropylene and then copolymerizing ethylene and propylene in the presence of the homopolypropylene.

[0027] Among these, random polypropylene is preferred from the viewpoint of improving flexibility and heat resistance during heat sealing, etc., compared to polyethylene resins, since ethylene copolymerization reduces stereoregularity and decreases crystallinity. Furthermore, block polypropylene is preferred from the viewpoint of improving rigidity and heat resistance.

[0028] When random polypropylene is used, the content of copolymerized α-olefin units such as ethylene is preferably less than 5% by mass, more preferably 4.5% by mass or less. If the content of α-olefin units is 5% by mass or more, the tacticity will be low and the crystallinity will be reduced, which may result in a low melting point.

[0029] Furthermore, examples of polypropylene-based resins include propylene-α-olefin copolymers obtained by copolymerizing propylene with an α-olefin having three or more carbon atoms. Examples of α-olefins having three or more carbon atoms include ethylene, 1-butene, 4-methylpentene-1, hexene, and octene. Examples of propylene-α-olefin copolymers include propylene-α-olefin copolymer elastomers, which are one of the propylene-based elastomers described below.

[0030] The olefin-based resin and the styrene-based resin may be used alone or in combination of two or more. For example, from the viewpoint of improving flexibility, a blend of random polypropylene and linear low-density polyethylene may be used.

[0031] Furthermore, the surface layers 6 and 7 may be made of the same type of olefin-based resin, or different types of olefin-based resins.

[0032] The lubricant is a component that imparts lubricity to the surfaces of the surface layers 6, 7. Examples of the lubricant include inorganic fillers (inorganic lubricants) such as calcium carbonate, zeolite, silica, titanium oxide, calcium oxide, magnesium oxide, zinc oxide, clay, mica, barium sulfate, and magnesium hydroxide, and organic fillers (organic lubricants) such as amide-based lubricants. Examples of amide-based lubricants include erucic acid amide-based lubricants and stearic acid amide-based lubricants, with erucic acid amide-based lubricants being preferred. Note that one type of lubricant may be used alone, or two or more types may be used in combination.

[0033] Furthermore, the content of the lubricant in the entire surface layer 6 (or surface layer 7) (i.e., the entire thermoplastic resin composition) is preferably 10% by mass or more and 75% by mass or less, more preferably 30% by mass or more and 70% by mass or less, and even more preferably 40% by mass or more and 60% by mass or less, when the entire surface layer is taken as 100% by mass. This is because if it is less than 10% by mass, the lubricant content in the surface layer will decrease, which may result in a decrease in the slipperiness of the surface of the surface layer, and if it is more than 75% by mass, the lubricant content in the surface layer will increase, which may result in a decrease in the flexibility of the surface layer.

[0034] The average particle size of the lubricant is preferably 0.8 to 10 μm. If the average particle size of the lubricant is 0.8 μm or more, secondary aggregation of the lubricant is suppressed, dispersibility in the resin is improved, and lubrication is improved. If the average particle size is 10 μm or less, the appearance of the film is not deteriorated and hole formation in the film can be suppressed.

[0035] The thermoplastic resin contained in the thermoplastic resin composition forming the surface layers 6, 7 may include a thermoplastic elastomer.

[0036] "Thermoplastic elastomer" means a polymer or polymer blend that has properties similar to those of vulcanized rubber at use temperatures, loses these properties at processing temperatures, is easily processed, and regains its original properties when returned to use temperatures.

[0037] The thermoplastic elastomer used in the present invention includes olefin-based elastomers and styrene-based elastomers.

[0038] Examples of olefin-based elastomers include copolymers or homopolymers mainly composed of an olefin having 3 or more carbon atoms, ethylene-based elastomers which are copolymers of ethylene mainly composed of an olefin having 4 or more carbon atoms, and propylene-based elastomers which are copolymers of propylene mainly composed of an olefin having 3 or more carbon atoms.

[0039] More specifically, examples of the elastomer include (1) α-olefin homopolymers such as propylene homopolymers and 1-butene homopolymers having low stereoregularity, (2) α-olefin copolymers such as propylene-ethylene copolymers, propylene-ethylene-1-butene copolymers, 1-butene-ethylene copolymers, 1-butene-propylene copolymers, 4-methylpentene-1-propylene copolymers, 4-methylpentene-1-1-butene copolymers, 4-methylpentene-1-propylene-1-butene copolymers, propylene-1-butene copolymers, ethylene-propylene copolymers, ethylene-hexene copolymers, and ethylene-octene copolymers, and (3) ethylene-α-olefin-diene terpolymers such as ethylene-propylene-ethylidenenorbornene copolymers, ethylene-propylene-butadiene copolymers, and ethylene-propylene-isoprene copolymers. Furthermore, elastomers in which the above-mentioned elastomers are dispersed in a crystalline polyolefin matrix may also be used. The olefin-based thermoplastic elastomer may be used alone or in combination of two or more kinds.

[0040] Examples of styrene-based elastomers include styrene-isoprene-styrene copolymers (SIS elastomers), styrene-isoprene block copolymers, styrene-butadiene-styrene block copolymers (SBS elastomers), styrene-butadiene block copolymers, hydrogenated styrene-isoprene-styrene block copolymers (styrene-ethylene-propylene-styrene block copolymers (SEPS elastomers)), hydrogenated styrene-butadiene-styrene block copolymers (styrene-ethylene-butylene-styrene block copolymers (SEBS elastomers)), and styrene-ethylene-ethylene-propylene-styrene copolymers (SEEPS elastomers). Among these, SIS elastomers are preferred because of their higher elasticity. The styrene-based elastomers may be used alone or in combination of two or more.

[0041] Thermoplastic elastomers are generally composed of hard segments that govern basic physical properties such as mechanical properties, and soft segments that govern elasticity, which is a rubber-like property. Olefin-based elastomers whose hard segments consist of polyethylene are called ethylene-based elastomers (ethylene-α-olefin copolymer elastomers), and those whose hard segments consist of polypropylene are called propylene-based elastomers (propylene-α-olefin copolymer elastomers). Examples of hard segments of styrene-based elastomers include polystyrene, and examples of soft segments of styrene-based elastomers include polybutadiene, polyisoprene, polyethylene, or hydrogenated versions of these.

[0042] Furthermore, since olefin-based elastomers such as ethylene-based elastomers or propylene-based elastomers have excellent isotropy, the use of olefin-based elastomers such as ethylene-based elastomers or propylene-based elastomers improves the flexibility of the resin film 4 and also improves the ability of the resin film 4 to conform to the packaged item.

[0043] The density of ethylene elastomers or propylene elastomers is 0.900 g / cm 3 Preferably, it is 0.895 g / cm or less. 3 More preferably, it is 0.890 g / cm or less. 3 It is more preferable that the density is 0.900 g / cm or less. 3 In the following cases, the proportion of soft segments contained in the elastomer increases, and excellent flexibility and stretchability can be obtained.

[0044] When a propylene-based elastomer is used, the content of α-olefin units such as ethylene copolymer is preferably less than 5% by mass, more preferably 4.5% by mass or less, from the viewpoint of improving rigidity.

[0045] Furthermore, when a thermoplastic elastomer is used, the content of the thermoplastic elastomer in the entire surface layer 6 (or surface layer 7) is preferably 10 to 70 mass %, more preferably 20 to 60 mass %, and even more preferably 30 to 50 mass %, of 100 mass % of the surface layer, from the viewpoint of improving the flexibility of the resin film 4. This is because if it is less than 10 mass %, the content of the thermoplastic elastomer in the surface layer will decrease, which may result in a decrease in the flexibility of the resin film 4, and if it is more than 70 mass %, the content of the thermoplastic elastomer in the surface layer will increase, which may result in a decrease in the rigidity of the resin film 4.

[0046] Furthermore, the content of the thermoplastic resin in the entire surface layer 6 (or surface layer 7) (i.e., the entire thermoplastic resin composition) is preferably 10% by mass or more and 90% by mass or less, more preferably 20% by mass or more and 70% by mass or less, and even more preferably 40% by mass or more and 60% by mass or less, when the entire surface layer is taken as 100% by mass. This is because if it is less than 20% by mass, the lubricant content in the surface layer is too high, which may reduce the film formability, and if it is more than 90% by mass, the lubricant content in the surface layer is reduced, which may reduce the slipperiness on the surface of the surface layer.

[0047] The thickness of the surface layers 6, 7 is not particularly limited and can be, for example, 1 to 15 μm, preferably 4 to 12 μm, and more preferably 6 to 10 μm.

[0048] The surface layers 6, 7 may contain other components as long as the effects of the present invention are not impaired. Examples of other components include resins other than the above-mentioned olefin-based resins, elastomers other than the above-mentioned thermoplastic elastomers, plasticizers, ultraviolet absorbers, antioxidants, weather stabilizers, antistatic agents, colorants, antifogging agents, metal soaps, waxes, mildew inhibitors, antibacterial agents, nucleating agents, and flame retardants.

[0049] (middle class) The intermediate layer 8 is a layer that imparts stretchability to the resin film 4, and this intermediate layer 8 contains at least one resin selected from the group consisting of a thermoplastic elastomer and an olefin-based resin.

[0050] The thermoplastic elastomer used in the mid layer 8 may be the above-mentioned styrene-based elastomer or olefin-based elastomer.

[0051] Among these, it is preferable to use a styrene-based elastomer from the viewpoint of improving dimensional stability during film transport, and it is preferable to use a propylene-based elastomer from the viewpoint of improving the conformability of the resin film 4 to the packed article. Furthermore, it is preferable to use an ethylene-based elastomer from the viewpoint of improving compatibility with the thermoplastic resin in the surface layers 6, 7 and improving isotropy.

[0052] Furthermore, when a propylene-based elastomer is used, from the viewpoint of improving flexibility, the content of α-olefin units such as ethylene, which is a copolymer, is preferably 5% by mass or more, more preferably 10% by mass or more, and even more preferably 15% by mass or more.

[0053] Furthermore, when a propylene-based elastomer is used, from the viewpoint of improving rigidity, the content of α-olefin units such as ethylene, which is a copolymer, is preferably less than 5% by mass, more preferably less than 4.5% by mass, and even more preferably 4% by mass or less.

[0054] When an SIS elastomer is used, the content of styrene units relative to the total units of the SIS elastomer is preferably 9% by mass or more and less than 50% by mass, and more preferably 12% by mass or more and less than 30% by mass. If the content of styrene units, which are hard segments, is 9% by mass or more, the stress during elongation is improved, resulting in excellent rigidity and transportability, while if it is less than 50% by mass, the elasticity of the soft segments results in excellent stretchability.

[0055] The density of styrene elastomer is 0.99 g / cm 3The density of the styrene elastomer is preferably less than 0.99 g / cm 3 In the above cases, the stretchability of the film may decrease.

[0056] From the viewpoint of improving flexibility, it is preferable to use a polyethylene resin as the olefin resin used in the mid layer 8. Among these, linear low-density polyethylene is preferable from the viewpoint of further improving flexibility.

[0057] The thickness of the intermediate layer 8 is not particularly limited and can be, for example, 5 to 35 μm, preferably 7 to 30 μm, and more preferably 10 to 20 μm.

[0058] Furthermore, the intermediate layer 8 may contain other components as required, as long as the effects of the present invention are not impaired.

[0059] <Air supply section> As shown in Fig. 1, an air supply unit 10 for inflating the bag body 3 is attached to the bag body 3. The air supply unit 10 includes a main body 11, an air supply hole 12 formed in the main body 11, and an air supply valve 13 that is inserted into the bag body 3 through the air supply hole 12 and has an opening 13a at the air supply hole 12. The air supply valve 13 is not particularly limited as long as it has a check valve structure, and for example, a known film valve having a check valve structure can be used.

[0060] In the air supply hole 12, a straw-shaped device is inserted into the opening 13a of the air supply valve 13 up to the inside of the bag body 3 (i.e., the space 5 of the bag body 3), and air is supplied to the bag body 3, causing the bag body 3 to inflate. Note that in the cushioning material for packaging 1 of this embodiment, the state in which the bag body 3 is inflated (i.e., the perspective view of the cushioning material for packaging 1 with the bag body 3 inflated, shown in FIG. 18 described later) is shown in FIG.

[0061] <Manufacturing method for packaging cushioning material> Next, the method for manufacturing the cushioning material for packaging according to this embodiment will be described in detail.

[0062] First, prepare the resin film 4 that will form the bag body 3. This resin film 4 is produced by molding a raw material containing the above-mentioned thermoplastic elastomer, thermoplastic resin, and lubricant into a film using an extruder.

[0063] More specifically, for example, a thermoplastic resin composition for forming an intermediate layer is obtained by mixing a thermoplastic elastomer and, if necessary, the other components described above at a predetermined blending ratio, and a thermoplastic resin, a lubricant, and, if necessary, the other components described above at a predetermined blending ratio, which is then extruded into a strand shape using a co-rotating twin-screw extruder equipped with a strand die or the like and cut to obtain a thermoplastic resin composition for forming a surface layer (pellets for forming the surface layer).

[0064] Next, using an extruder equipped with a T-die, the thermoplastic resin composition for forming the intermediate layer and the thermoplastic resin composition for forming the surface layer are extruded at a predetermined temperature, and a cast film process is used to obtain a resin film 4 having an intermediate layer 8, a first surface layer 6 provided on the first side of the intermediate layer 8, and a second surface layer 7 provided on the second side of the intermediate layer 8.

[0065] Next, as shown in Figure 5, the surface layers (e.g., surface layers 6) of the two resin films 4 are placed face to face and overlapped, and an air supply unit 10 is inserted between the surface layers of the two resin films 4, so that the air supply unit 10 is sandwiched between the two resin films 4.

[0066] Next, the four opposing sides of the surface layers of the two resin films 4 are joined together by heat sealing, and a portion of the air supply section 10 is joined to the two resin films 4, thereby producing a bag body 3 (i.e., the bag body shown in Figures 1 to 3) formed by the resin film 4 to which the air supply section 10 is attached and having a space section 5 formed inside the resin film 4.

[0067] From the viewpoint of productivity, it is preferable to use the above-mentioned cast film process, but the method for producing the resin film 4 of the present invention is not particularly limited, and for example, an inflation method may also be used.

[0068] When using the inflation method, first, the thermoplastic resin composition for forming the intermediate layer and the thermoplastic resin composition for forming the surface layer are melted at a predetermined temperature in an extruder equipped with a circular die, and then co-extruded to form a film, thereby producing a bag-shaped resin film 4.

[0069] Next, as shown in Figure 6, an air supply unit 10 is inserted into one of the opposing sides of a tubular resin film 4, and the air supply unit 10 is sandwiched between the resin film 4. After that, the two opposing sides of the resin film 4 (the sides into which the air supply unit 10 is inserted and the sides into which the air supply unit 10 is not inserted) are joined together by heat sealing, and a part of the air supply unit 10 is joined to the resin film 4, thereby producing a bag body 3 (i.e., the bag body shown in Figures 1 to 3) formed by the resin film 4 to which the air supply unit 10 is attached and having a space portion 5 formed inside the resin film 4.

[0070] After manufacturing the bag body 3, as shown in FIG. 7, both end portions 3f of the bag body 3 are folded outward in the longitudinal direction X of the bag body 3, thereby overlapping a portion of the bag body 3, and as shown in FIGS. 8 and 9, the surface 3s of the bag body 3 and the surface 2a of the base material 2 are overlapped facing each other.

[0071] Then, with, for example, adhesive or double-sided tape applied to the surface 2a of the base material 2 (or the surface 3s of the bag body 3), the surface 3s of the bag body 3 and the surface 2a of the base material 2 are brought into contact and laminated together, and the bag body 3 is attached to the base material 2, thereby producing the packaging cushioning material 1 of this embodiment shown in Figures 1 to 3 and 10.

[0072] As shown in Figures 1 to 3 and 10, the bag body 3 in this cushioning packaging material 1 has a first fixing portion 3a that fixes the packaged item by coming into contact with the packaged item, and a second fixing portion 3b that is connected to the first fixing portion 3a and fixes the packaged item by coming into contact with a portion of the packaged item different from the portion that the first fixing portion 3a contacts.

[0073] 10, the first fixing portion 3a and the second fixing portion 3b may be temporarily fixed with a weak adhesive or the like. Temporarily fixing the first fixing portion 3a and the second fixing portion 3b improves the handling of the cushioning material. The temporary fixing of the first fixing portion 3a and the second fixing portion 3b can be easily released by inflating the bag body 3.

[0074] As shown in FIGS. 10 to 12, in the bag body 3, a second fixing portion 3b is provided so as to be movable in the direction of the arrow in the drawings relative to a first fixing portion 3a.

[0075] <How to pack items> Next, a method for packaging an object using the cushioning material for packaging of this embodiment will be described.

[0076] First, as shown in Fig. 13, a packing container 20 is prepared to house the object to be packed and the cushioning packaging material 1. The packing container 20 is not particularly limited, and examples thereof include boxes and bags (e.g., cardboard boxes) made of paper or resin. The packing container 20 is provided with lids 20a to 20d, and a hole 20e is formed in the packing container 20.

[0077] Next, as shown in FIG. 14, the packaged object 30 is placed inside the packaging container 20.

[0078] Next, as shown in Fig. 15, cushioning packaging material 1 is placed on top of item 30 to be packed, and then the cushioning packaging material 1 is stored in packaging container 20. At this time, as shown in Fig. 16, a part of air supply unit 10 (air supply hole 12 provided with air supply valve 13) is arranged from the inside of packaging container 20 to the outside through hole 20e formed in packaging container 20. With this configuration, it becomes possible to supply air to bag body 3 by inserting a straw-shaped device into opening 13a of air supply valve 13 in air supply hole 12 from the outside of packaging container 20 to the inside of bag body 3 (i.e., space 5 of bag body 3).

[0079] Next, as shown in FIG. 17, the lids 20a to 20d of the packaging container 20 are sealed.

[0080] Then, in the state shown in Figure 17, a straw-shaped device is inserted into the air supply valve 13 of the air supply unit 10, and air is supplied to the bag body 3, causing the bag body 3 (i.e., the part consisting of the first fixing part 3a and the second fixing part 3b) to inflate as shown in Figures 18 and 19, and the packaged item 30 is fixed by the first fixing part 3a and the second fixing part 3b.

[0081] In this case, as described above, since the resin film 4 forming the bag body 3 contains a lubricant, the slipperiness of the surface of the bag body 3 is improved, and when the folded bag body 3 expands from the state shown in Figure 15 to the state shown in Figure 18, even if the bag body 3 and the packaging container 20, and the bag body 3 and the packaged item 30 come into contact, the bag body 3 will not get caught on the packaging container 20 and the packaged item 30, and the bag body 3 will be able to expand smoothly while flexibly deforming to follow the shapes of the packaging container 20 and the packaged item 30.

[0082] Therefore, as shown in Figure 18, the first fixing portion 3a and the second fixing portion 3b of the bag body 3 flexibly wrap around multiple surfaces of the packaged item 30 (for example, not only the top surface 30a of the packaged item 30, but also the left and right surfaces 30b and 30c) in accordance with the shape of the packaged item 30, and the first fixing portion 3a fixes the packaged item 30 by coming into contact with the top surface 30a of the packaged item 30, while the second fixing portion 3b fixes the packaged item 30 by coming into contact with a portion of the packaged item 30 other than the portion with which the first fixing portion 3a contacts (i.e., the top surface 30a) (i.e., the left and right surfaces 30b and 30c).As a result, it becomes possible to fix the packaged item 30 on multiple surfaces of the packaged item 30 by the first fixing portion 3a and the second fixing portion 3b. Therefore, since multiple cushioning packing materials are no longer required depending on the shape and number of the packaged items 30, it becomes possible to securely fix and pack the packaged items 30 using only one cushioning packing material 1 without being affected by the shape and number of the packaged items 30.

[0083] Furthermore, since multiple cushioning materials for packaging are no longer required depending on the shape and number of the items 30 to be packaged, it is possible to provide a cushioning material for packaging 1 that can be used for automatic packaging by a robot or the like.

[0084] Furthermore, the bag body 3 in the cushioning packaging material 1 of this embodiment has a first fixing portion 3a that contacts the top surface 30a of the object 30 to fix the object 30, and a second fixing portion 3b that is connected to the first fixing portion 3a and contacts a portion of the object 30 (i.e., the left and right surfaces 30b, 30c) other than the portion with which the first fixing portion 3a contacts (i.e., the top surface 30a) to fix the object 30. As a result, as shown in Fig. 18, the first fixing portion 3a and the second fixing portion 3b can reliably fix the object 30 without creating a gap between the bag body 3 and the object 30. Therefore, since the object 30 is resistant to vibrations in the up-down and left-right directions when transporting the object 30, it is possible to package the object 30 in a state where it is reliably fixed on multiple surfaces of the object 30.

[0085] Furthermore, since the second fixing portion 3b is provided so as to be movable relative to the first fixing portion 3a, the bag body 3 can easily deform to follow the shape of the article 30 to be packed.

[0086] In addition, an air supply unit 10 is attached to the bag body 3 in the packaging cushioning material 1 of this embodiment, and after the packaged item 30 and the packaging cushioning material 1 are stored inside the packaging container 20 and the lids 20a to 20d of the packaging container 20 are sealed, the air supply unit 10 arranged outside the packaging container 20 supplies air to the bag body 3 to inflate the bag body 3, and the packaged item 30 can be fixed by the first fixing part 3a and the second fixing part 3b, making it possible to securely fix the packaged item 30 with a simple configuration.

[0087] [Second embodiment] Next, a second embodiment of the present invention will be described. Note that components similar to those in the first embodiment are given the same reference numerals and descriptions thereof will be omitted.

[0088] Fig. 20 is a plan view showing the cushioning material for packaging according to this embodiment, and Fig. 21 is a cross-sectional view taken along line BB in Fig. 1. Also, Fig. 22 is a perspective view showing the cushioning material for packaging according to this embodiment.

[0089] As shown in Figures 20 to 22, the packaging cushioning material 40 of this embodiment is characterized in that the second fixing portion 3b of the bag body 3 in the packaging cushioning material 1 of the first embodiment described above overlaps with the first fixing portion 3a in a plan view.

[0090] More specifically, as shown in Figure 21, by folding both ends of the bag body 3 formed from the resin film 4 and storing the second fixing portion 3b of the bag body 3 inside the bag body 3, the first fixing portion 3a and the second fixing portion 3b are configured to overlap in a planar view.

[0091] Furthermore, with this configuration, unlike the first embodiment, temporary fastening of the first fixing portion 3a and the second fixing portion 3b is not required, which makes it possible to improve ease of handling.

[0092] <Manufacturing method for packaging cushioning material> Next, the method for manufacturing the cushioning material for packaging according to this embodiment will be described in detail.

[0093] First, in the same manner as in the first embodiment described above, a resin film 4 is produced, for example, by a cast film method. Next, by the same method as that described above in Figs. 5 and 6, a bag 3 (i.e., the bag shown in Figs. 1 to 3) is produced, which is formed from the resin film 4 to which the air supply section 10 is attached and has a space section 5 formed inside the resin film 4.

[0094] Next, as shown in Figures 23 and 24, both end portions 3f of the bag body 3 are folded inside the bag body 3 in the longitudinal direction X of the bag body 3, thereby overlapping a portion of the bag body 3, and as shown in Figures 24 and 25, the surface 3s of the bag body 3 and the surface 2a of the base material 2 are overlapped facing each other.

[0095] Then, with, for example, adhesive or double-sided tape applied to the surface 2a of the base material 2 (or the surface 3s of the bag body 3), the surface 3s of the bag body 3 and the surface 2a of the base material 2 are brought into contact and laminated together, and the bag body 3 is attached to the base material 2, thereby producing the packaging cushioning material 40 of this embodiment shown in Figures 21 to 22 and 26.

[0096] Also, as shown in Figures 21 to 22 and 26, the bag body 3 in this packaging cushioning material 40 has, as in the first embodiment described above, a first fixing portion 3a that fixes the packaged item 30 by coming into contact with the packaged item 30, and a second fixing portion 3b that is connected to the first fixing portion 3a and fixes the packaged item 30 by coming into contact with a portion of the packaged item 30 other than the portion that the first fixing portion 3a contacts.

[0097] <How to pack items> Next, a method for packaging an object using the cushioning material for packaging of this embodiment will be described.

[0098] First, the packaging container 20 is prepared and the object to be packed 30 is placed in the packaging container 20 in the same manner as described above with reference to FIGS.

[0099] Next, as shown in Fig. 27, cushioning packing material 40 is placed on top of the packaged item 30, and the cushioning packing material 40 is stored in the packing container 20. At this time, as in the case of Fig. 16 described above, a part of the air supply unit 10 (air supply hole 12 provided with air supply valve 13) is positioned from the inside of the packing container 20 toward the outside through hole 20e formed in the packing container 20.

[0100] Next, as shown in FIG. 28, the lids 20a to 20d of the packaging container 20 are sealed.

[0101] 28, a straw-shaped device is inserted into air supply valve 13 of air supply unit 10 to supply air to bag body 3. At this time, first fixing part 3a expands, and second fixing part 3b stored inside bag body 3 expands while protruding outward from bag body 3, and bag body 3 assumes the same state as in the above-described FIGS. 18 and 19, and item to be packed 30 is fixed by first fixing part 3a and second fixing part 3b.

[0102] As described above, the cushioning material 40 of this embodiment can provide the same effects as those provided by the cushioning material 1 of the first embodiment.

[0103] [Third embodiment] Next, a third embodiment of the present invention will be described. Note that components similar to those in the first embodiment are given the same reference numerals and descriptions thereof will be omitted.

[0104] Fig. 29 is a plan view showing the cushioning material for packaging according to this embodiment, Fig. 30 is a perspective view showing the cushioning material for packaging according to this embodiment, and Fig. 31 is a cross-sectional view taken along CC in Fig. 29.

[0105] As shown in Figures 29 to 31, the packaging cushioning material 50 of this embodiment is characterized in that the above-mentioned first fixing portion 3a and second fixing portion 3b are connected and formed adjacent to each other by heat-sealing a portion of the resin film 4 that forms the bag body 3.

[0106] More specifically, as shown in Figure 31, when forming the bag body 3 using the resin film 4, both end portions of the resin film 4 are folded inward of the resin film 4, and as shown in Figure 30, parts of the two opposing sides of the resin film 4 (the end sides whose both end portions are not folded inward of the resin film 4) are heat-sealed, thereby forming the above-mentioned first fixing portion 3a and second fixing portion 3b adjacent to each other.

[0107] With this configuration, the second fixing portion 3b can be easily guided between the packaging container 20 and the object 30 to be packed.

[0108] <Manufacturing method for packaging cushioning material> Next, the method for manufacturing the cushioning material for packaging according to this embodiment will be described in detail.

[0109] First, in the same manner as in the first embodiment described above, a resin film 4 is manufactured by, for example, a cast film method. Next, as shown in Fig. 32, two resin films 4 are stacked facing each other, and two opposing sides of the two resin films 4 (two sides perpendicular to the side where the air supply unit 10 is inserted) are joined together to manufacture a cylindrical resin film 4 (resin film 4 without the air supply unit 10 inserted) as in Fig. 6.

[0110] Next, as shown in Figure 33, in the longitudinal direction Y of the resin film 4, both end portions 4f of the tubular resin film 4 are folded inward of the resin film 4, thereby overlapping portions of the resin film 4, and an air supply unit 10 is inserted between one of the opposing sides of one of the two sides that are not joined between the two resin films 4, thereby sandwiching the air supply unit 10 between the two resin films 4.

[0111] Next, as shown in Figure 34, to prevent the opposing ends 4f of the two resin films from being heat-sealed together, a fusion prevention member (e.g., a Teflon (registered trademark) sheet) 25 is sandwiched between the ends 4f, and heat sealing is performed to join the two opposing sides of the two resin films 4 (the opposing sides into which the air supply unit 10 is inserted and the opposing sides on the side into which the air supply unit 10 is not inserted), and a part of the air supply unit 10 is joined to the two resin films 4, thereby producing a bag 3 (i.e., the bag shown in Figures 29 to 31) to which the air supply unit 10 is attached and which has a space 5 formed inside the resin film 4.

[0112] Since the opposing ends 4f of the two resin films are not heat-sealed to each other, the second fixing portion 3b described later can be freely provided on the side opposite to the side attached to the base material 2 of the bag body 3, as shown in Figure 30.

[0113] Next, as shown in FIGS. 35 and 36, the surface 3s of the bag body 3 and the surface 2a of the base material 2 are placed together so as to face each other.

[0114] Then, with, for example, adhesive or double-sided tape applied to the surface 2a of the base material 2 (or the surface 3s of the bag body 3), the surface 3s of the bag body 3 and the surface 2a of the base material 2 are brought into contact and laminated, and the bag body 3 is attached to the base material 2, thereby producing the packaging cushioning material 50 of this embodiment shown in Figures 29 to 31 and 37.

[0115] Also, as shown in Figures 29 to 31 and 37, the bag body 3 in this packaging cushioning material 50 has, as in the first and second embodiments described above, a first fixing portion 3a that fixes the packaged item 30 by coming into contact with the packaged item 30, and a second fixing portion 3b that is connected to the first fixing portion 3a and fixes the packaged item 30 by coming into contact with a portion of the packaged item 30 other than the portion that the first fixing portion 3a contacts.

[0116] As shown in FIGS. 29 to 31 and 37, the two second fixed portions 3b are provided adjacent to each other with the first fixed portion 3a interposed therebetween.

[0117] As shown in FIGS. 37 and 38, similarly to the first embodiment, in the bag body 3, the second fixing part 3b is provided so as to be movable in the direction of the arrow in the figure relative to the first fixing part 3a.

[0118] <How to pack items> Next, a method for packaging an object using the cushioning material for packaging of this embodiment will be described.

[0119] First, similarly to the method described above with reference to FIGS. 13 and 14, the packing container 20 is prepared, and the object to be packed 30 is placed in the packing container 20.

[0120] Next, as shown in Fig. 39, cushioning packing material 50 is placed on top of object to be packed 30, and then packed into packing container 20. At this time, as in the case of Fig. 16 described above, a part of air supply unit 10 (air supply hole 12 provided with air supply valve 13) is placed outside packing container 20 through hole 20e formed in packing container 20.

[0121] Next, as shown in FIG. 40, the lids 20a to 20d of the packaging container 20 are sealed.

[0122] Then, in the state shown in Figure 40, a straw-shaped device is inserted into the air supply valve 13 of the air supply unit 10, and air is supplied to the bag body 3, causing the bag body 3 (i.e., the part consisting of the first fixing part 3a and the second fixing part 3b) to inflate as shown in Figures 41 and 42, and the packaged item 30 is fixed by the first fixing part 3a and the second fixing part 3b.

[0123] As described above, the cushioning material 50 of this embodiment can provide the same effects as those provided by the cushioning material 1 of the first embodiment.

[0124] [Fourth embodiment] Next, a fourth embodiment of the present invention will be described. Note that components similar to those in the first embodiment are given the same reference numerals and descriptions thereof will be omitted.

[0125] Fig. 43 is a plan view showing the cushioning material for packaging according to this embodiment, and Fig. 44 is a cross-sectional view taken along line DD of Fig. 43. Also, Fig. 45 is a perspective view showing the cushioning material for packaging according to this embodiment.

[0126] As shown in Figures 43 to 45, the packaging cushioning material 60 of this embodiment is characterized in that, like the packaging cushioning material 40 of the second embodiment described above, the second fixing portion 3b of the bag body 3 overlaps the first fixing portion 3a in a planar view, and a portion of the resin film 4 forming the bag body 3 is heat-sealed.

[0127] More specifically, as shown in Figure 44, when forming the bag body 3 using the resin film 4, both end portions of the resin film 4 are folded inside the resin film 4, and as shown in Figure 45, the entire two opposing sides of the resin film 4 (the end sides whose both end portions are not folded inside the resin film 4) are heat-sealed to store the second fixing portion 3b of the bag body 3 inside the bag body 3, and in a planar view, the first fixing portion 3a and the second fixing portion 3b are overlapped and a heat-sealed portion 3d is formed.

[0128] That is, the cushioning material for packaging 60 of this embodiment is the cushioning material for packaging 40 of the second embodiment described above, with the heat-sealed portion 3d formed thereon.

[0129] With this configuration, when the resin film 4 is inflation-molded, the bags 3 can be mass-produced on a general production line for packaging bags.

[0130] <Manufacturing method for packaging cushioning material> Next, a method for manufacturing the cushioning material for packaging of this embodiment will be described in detail. The cushioning material for packaging 60 of this embodiment can be manufactured in the same manner as the cushioning material for packaging 50 of the third embodiment described above, except that the anti-fusing member 25 described in Fig. 34 above is not used.

[0131] More specifically, first, a resin film 4 is produced by, for example, a cast film method in the same manner as in the first embodiment described above. Next, as in the above-described Fig. 32, two resin films 4 are stacked facing each other, and two opposing sides of the two resin films 4 (two sides perpendicular to the side where the air supply unit 10 is inserted) are joined together to produce a cylindrical resin film 4 (resin film 4 without the air supply unit 10 inserted) as in Fig. 6.

[0132] Next, as in Figure 33 above, both end portions 4f of the tubular resin film 4 are folded inward in the longitudinal direction Y of the resin film 4, thereby overlapping portions of the resin film 4, and an air supply unit 10 is inserted between one of the opposing sides of one of the two sides that are not joined between the two resin films 4, and the air supply unit 10 is sandwiched between the two resin films 4.

[0133] Next, in the state shown in Figure 33, heat sealing is performed to join two opposing sides of the two resin films 4 (the opposing sides into which the air supply section 10 is inserted and the opposing sides into which the air supply section 10 is not inserted), and a part of the air supply section 10 is joined to the two resin films 4, thereby producing a bag body 3 (i.e., the bag body shown in Figures 43 to 46) to which the air supply section 10 is attached and which has a space section 5 formed inside the resin film 4.

[0134] In this case, unlike Figure 34 in the above-mentioned third embodiment, in the state shown in Figure 33, heat sealing is performed without sandwiching the anti-fusing member 25 between the both end portions 4f, so as shown in Figures 43, 45 to 46, the bag body 3 has a heat-sealable portion 3d where both end portions 4f of the resin film 4 are joined together.

[0135] Next, as shown in FIGS. 47 and 48, the surface 3s of the bag body 3 and the surface 2a of the base material 2 are placed together so as to face each other.

[0136] Then, with, for example, adhesive or double-sided tape applied to the surface 2a of the base material 2 (or the surface 3s of the bag body 3), the surface 3s of the bag body 3 and the surface 2a of the base material 2 are brought into contact and laminated together, and the bag body 3 is attached to the base material 2, thereby producing the packaging cushioning material 60 of this embodiment shown in Figures 43 to 45 and 49.

[0137] Also, as shown in Figures 43 to 45, the bag body 3 in this packaging cushioning material 60, as in the first to third embodiments described above, has a first fixing portion 3a that fixes the packaged item 30 by coming into contact with the packaged item 30, and a second fixing portion 3b that is connected to the first fixing portion 3a and fixes the packaged item 30 by coming into contact with a portion of the packaged item 30 other than the portion that the first fixing portion 3a contacts.

[0138] <How to pack items> Next, a method for packaging an object using the cushioning material for packaging of this embodiment will be described.

[0139] First, the packaging container 20 is prepared and the object to be packed 30 is placed in the packaging container 20 in the same manner as described above with reference to FIGS.

[0140] Next, as shown in Figure 50, cushioning packing material 60 is placed on top of the packaged item 30, and the cushioning packing material 60 is stored inside the packing container 20. At this time, as in the case of Figure 16 described above, a part of the air supply unit 10 (air supply hole 12 provided with air supply valve 13) is positioned from the inside of the packing container 20 toward the outside through hole 20e formed in the packing container 20.

[0141] Next, as shown in FIG. 51, the lids 20a to 20d of the packaging container 20 are sealed.

[0142] 51, a straw-shaped device is inserted into air supply valve 13 of air supply unit 10 to supply air to bag body 3. At this time, as shown in FIGS. 52 and 53, first fixing part 3a expands and second fixing part 3b, which has been housed inside bag body 3, expands while protruding outward from bag body 3, and item 30 is fixed by first fixing part 3a and second fixing part 3b.

[0143] In this embodiment, as described above, heat sealing 3d is formed in the bag body 3, so when air is supplied to the bag body 3, as shown in Figures 52 to 53, a part of the second fixing part 3b stored inside the bag body 3 expands and protrudes outward from the bag body 3, and the packaged item 30 is fixed by the second fixing part 3b.

[0144] As described above, the cushioning material 60 of this embodiment can provide the same effects as those provided by the cushioning material 1 of the first embodiment.

[0145] [Fifth embodiment] Next, a fifth embodiment of the present invention will be described. Note that components similar to those in the first embodiment are given the same reference numerals and descriptions thereof will be omitted.

[0146] Fig. 55 is a plan view showing the cushioning material for packaging according to this embodiment, Fig. 56 is an E-E sectional view of Fig. 55, and Fig. 57 is an F-F sectional view of Fig. 55. Also, Fig. 58 is a perspective view showing the cushioning material for packaging according to this embodiment.

[0147] As shown in Figures 55 to 58, in the packaging cushioning material 70 of this embodiment, similar to the packaging cushioning material 60 of the fourth embodiment described above, the second fixing portion 3b of the bag body 3 overlaps the first fixing portion 3a in a planar view, and a heat-sealed portion 3d is formed by heat-sealing a portion of the resin film 4 that forms the bag body 3.

[0148] More specifically, as shown in Figure 56, when forming the bag body 3 using the resin film 4, multiple locations (three locations in Figure 56) at both ends of the resin film 4 are folded inward in the short direction x of the resin film 4 to form an accordion-like shape, and as shown in Figure 58, the entire two opposing sides of the resin film 4 (the end sides whose both ends are not folded inward in the longitudinal direction y of the resin film 4 shown in Figure 55) are heat-sealed to store the second fixing portion 3b of the bag body 3 inside the bag body 3, and in a planar view, the first fixing portion 3a and the second fixing portion 3b are overlapped and a heat-sealed portion 3d is formed.

[0149] Furthermore, as shown in Figures 57 to 58, the packaging cushioning material 70 of this embodiment has a third fixing portion 3c that is connected to the first fixing portion 3a in the longitudinal direction y of the bag body 3 and fixes the packaged item by contacting a portion of the packaged item different from the portions where the first fixing portion 3a and the second fixing portion 3b contact.

[0150] With this configuration, it is possible to fix the packaged item 30 on multiple sides of the packaged item 30 using the first fixing portion 3a, the second fixing portion 3b, and the third fixing portion 3c, making it possible to fix and package the packaged item 30 more securely using only one packaging cushioning material 70.

[0151] <Manufacturing method for packaging cushioning material> Next, a method for manufacturing the cushioning material for packaging of this embodiment will be described in detail. The cushioning material for packaging 70 of this embodiment can be manufactured in the same manner as the cushioning material for packaging 60 of the above-mentioned fourth embodiment, except that when forming the bag body 3 from the resin film 4, multiple locations on both end portions of the resin film 4 are folded inward in the short direction x of the resin film 4 to form an accordion-like shape.

[0152] More specifically, first, a resin film 4 is manufactured by, for example, a cast film method in the same manner as in the first embodiment described above. Next, as shown in Fig. 59, two resin films 4 are stacked facing each other, and as shown in Fig. 60, two opposing sides of the two resin films 4 (two sides perpendicular to the side where the air supply unit 10 is inserted) are joined together to manufacture a cylindrical resin film 4 (resin film 4 without the air supply unit 10 inserted).

[0153] Next, as shown in Figure 61, in the short direction x of the resin film 4, multiple locations (four locations in Figure 61) of both end portions 4f of the resin film 4 are folded inward of the resin film 4 to form an accordion-like shape, and with parts of the resin film 4 overlapping, an air supply unit 10 is inserted between one of the opposing sides of one of the two sides that are not joined in the resin film 4, and the air supply unit 10 is sandwiched between the two resin films 4.

[0154] Next, in the state shown in Figure 61, heat sealing is performed to join two opposing sides of the two resin films 4 (the opposing sides into which the air supply section 10 is inserted and the opposing sides into which the air supply section 10 is not inserted), and a part of the air supply section 10 is joined to the resin film 4, thereby producing a bag body 3 (i.e., the bag body shown in Figures 55 to 58 and 62) to which the air supply section 10 is attached and which has a space section 5 formed inside the resin film 4.

[0155] In this case, as in the case of the fourth embodiment described above, in the state shown in Figure 61, thermal fusion is performed by heat sealing without sandwiching the anti-fusion member 25 between the both end portions 4f, so as shown in Figures 55, 58 and 62, the bag body 3 has a heat-sealable portion 3d where both end portions 4f of the resin film 4 are joined together.

[0156] Next, as shown in FIGS. 63 and 64, the surface 3s of the bag body 3 and the surface 2a of the base material 2 are placed together so as to face each other.

[0157] Then, with, for example, adhesive or double-sided tape applied to the surface 2a of the base material 2 (or the surface 3s of the bag body 3), the surface 3s of the bag body 3 and the surface 2a of the base material 2 are brought into contact and laminated together, and the bag body 3 is attached to the base material 2, thereby producing the packaging cushioning material 70 of this embodiment shown in Figures 55 to 58 and 65.

[0158] As shown in Figures 55 to 58, the bag body 3 in this packaging cushioning material 70, as in the first and second embodiments described above, has a first fixing portion 3a that comes into contact with the packaged item 30 to fix the packaged item 30, a second fixing portion 3b that is connected to the first fixing portion 3a and fixes the packaged item 30 by coming into contact with a portion of the packaged item 30 other than the portion that the first fixing portion 3a contacts, and a third fixing portion 3c that is connected to the first fixing portion 3a and fixes the packaged item by coming into contact with a portion of the packaged item other than the portions that the first fixing portion 3a and the second fixing portion 3b contact.

[0159] <How to pack items> Next, a method for packaging an object using the cushioning material for packaging of this embodiment will be described.

[0160] First, as shown in Fig. 66, a packaging container 90 (in an unfolded state) is prepared to house the packaged item 30 and the packaging cushioning material 70. This packaging container 90 is not particularly limited, and examples thereof include boxes and bags made of paper or resin, such as the cardboard box shown in Fig. 66 (equivalent to the well-known N-type cardboard box).

[0161] The packaging container 90 includes a bottom surface 90a, side surfaces 90b-90c, a front surface 90d, and a rear surface 90e connected to the bottom surface 90a, and a lid 90f connected to the rear surface 90e. The front surface 90d is composed of an inner wall surface 90h having a protrusion 90g formed therein, and an outer wall surface 90i connected to the inner wall surface 90h. The side surface 90b is formed with a hole 90m for arranging a part of the air supply unit 10 (air supply hole 12 provided with air supply valve 13) from the inside of the packaging container 90 to face outward. The bottom surface 90a is formed with an insertion portion 90n into which the protrusion 90g formed on the inner wall surface 90h is inserted when assembling the cardboard box.

[0162] Next, as shown in Figure 67, the item to be packaged 30 is placed on the bottom surface 90a of the packaging container 90, and the lid 90f of the packaging container 90 is used as the base material 2. With, for example, adhesive or double-sided tape applied to the surface of the lid 90f (or the surface 3s of the bag body 3), the surface 3s of the bag body 3 and the surface of the lid 90f are brought into contact and laminated, and the bag body 3 is attached to the lid 90f, thereby preparing a packaging cushioning material 70 comprising the lid 90f which serves as the base material 2 and the bag body 3.

[0163] Next, the packaging container 90 in the unfolded state shown in Fig. 67 is assembled as shown in Fig. 68, and after the item to be packed 30 is stored in the packaging container 90, the lid 90f to which the bag body 3 is attached is valley-folded along the fold portion 90p, and in this state, as shown in Fig. 69, the lid 90f is sealed so that the lid 90f is positioned inside the side portions 90b to 90c, thereby placing the cushioning packaging material 70 above the item to be packed 30 and storing the bag body 3 of the cushioning packaging material 70 in the packaging container 90. A cross-sectional view taken along line H-H of Fig. 69 is shown in Fig. 70, and a cross-sectional view taken along line II of Fig. 69 is shown in Fig. 71.

[0164] In this case, as shown in Figures 69 to 70, a part of the air supply section 10 (air supply hole 12 provided with an air supply valve 13) is arranged facing outward from the inside of the packing container 90 through a hole 90m formed in the packing container 90.

[0165] 70 to 71, when a straw-shaped device is inserted into air supply valve 13 of air supply unit 10 and air is supplied to bag body 3, first fixing portion 3a and third fixing portion 3c of bag body 3 expand, and second fixing portion 3b stored inside bag body 3 expands while protruding outward from bag body 3, as shown in FIGS. 72 to 74, and first fixing portion 3a, second fixing portion 3b and third fixing portion 3c of bag body 3 flexibly rotate in accordance with the shape of object 30 to be packed on multiple surfaces of object 30 to be packed (for example, not only top surface 30a of object 30 to be packed, but also left and right surfaces 30b, 30c and front and rear surfaces 30d, 30e). The first fixing portion 3a comes into contact with the top surface 30a of the object 30 to fix the object 30, the second fixing portion 3b comes into contact with a portion of the object 30 that is different from the portion with which the first fixing portion 3a comes into contact (i.e., the top surface 30a) (i.e., the left and right surfaces 30b, 30c), and further the third fixing portion 3c comes into contact with a portion of the object 30 that is different from the portion with which the first fixing portion 3a and the second fixing portion 3b come into contact (i.e., the top surface 30a, the left and right surfaces 30b, 30c) (i.e., the front and rear surfaces 30d, 30e), and the object 30 is fixed by the first fixing portion 3a, the second fixing portion 3b and the third fixing portion 3c.

[0166] In this embodiment, as described above, heat sealing 3d is formed on the bag body 3, so when air is supplied to the bag body 3, as shown in Figure 73, a part of the accordion-shaped second fixing part 3b stored inside the bag body 3 expands while protruding outward from the bag body 3, and the packaged item 30 is fixed by the second fixing part 3b.

[0167] As described above, the cushioning material 70 of this embodiment can provide the same effects as those provided by the cushioning material 1 of the first embodiment.

[0168] [Sixth embodiment] Next, a sixth embodiment of the present invention will be described. Note that components similar to those in the first embodiment are given the same reference numerals and descriptions thereof will be omitted.

[0169] Fig. 75 is a plan view showing the cushioning material for packaging according to this embodiment, and Fig. 76 is a cross-sectional view taken along line GG of Fig. 75. Also, Fig. 77 is a perspective view showing the cushioning material for packaging according to this embodiment.

[0170] The packaging cushioning material 80 of this embodiment has a structure similar to that of the packaging cushioning material 60 of the fourth embodiment described above, and as shown in Figures 75 to 77, is the packaging cushioning material 60 extended in the longitudinal direction b, and has a fixing portion 3e that fixes the packaged item 30 by contacting at least the entire side surface of the packaged item 30 stored in a packaging container (i.e., placed inside the packaging container).

[0171] More specifically, as shown in Figure 76, when forming the bag body 3 using the resin film 4, both end portions of the resin film 4 are folded inside the resin film 4, and as shown in Figure 77, the entire two opposing sides of the resin film 4 (the end portions whose both end portions are not folded inside the resin film 4) are heat-sealed to store both end portions 3f of the bag body 3 inside the bag body 3, and in a planar view, the fixed portion 3e and both end portions 3f are overlapped, and a heat-sealed portion 3d is formed.

[0172] With this configuration, it is possible to fix the packaged item 30 by the fixing portion 3e on at least the entire side of the packaged item 30 stored in the packaging container, so that the packaged item 30 can be fixed and packaged more securely using only one packaging cushioning material 80.

[0173] <Manufacturing method for packaging cushioning material> Next, a method for manufacturing the cushioning material for packaging of this embodiment will be described in detail. The cushioning material for packaging 80 of this embodiment can be manufactured in the same manner as the cushioning material for packaging 60 of the above-mentioned fourth embodiment.

[0174] More specifically, first, a resin film 4 is manufactured by, for example, a cast film method in the same manner as in the first embodiment described above. Next, two resin films 4 are stacked facing each other as in Fig. 59, and two opposing sides of the two resin films 4 (two sides perpendicular to the side where the air supply unit 10 is inserted) are joined together as in Fig. 60 to manufacture a cylindrical resin film 4 (resin film 4 without the air supply unit 10 inserted).

[0175] Next, as shown in Figure 78, in the short direction a of the resin film 4, both end portions 4f of the resin film 4 are folded inward of the resin film 4, thereby overlapping parts of the resin film 4, and an air supply unit 10 is inserted between one of the opposing sides of one of the two sides that are not joined between the two resin films 4, and the air supply unit 10 is sandwiched between the two resin films 4.

[0176] Next, in the state shown in Figure 78, heat sealing is performed to join two opposing sides of the two resin films 4 (the opposing sides into which the air supply section 10 is inserted and the opposing sides into which the air supply section 10 is not inserted), and a part of the air supply section 10 is joined to the two resin films 4, thereby producing a bag body 3 (i.e., the bag body shown in Figures 75 to 77 and 79) to which the air supply section 10 is attached and which has a space section 5 formed inside the resin film 4.

[0177] In this case, as in the case of the fourth embodiment described above, in the state shown in Figure 78, thermal fusion is performed by heat sealing without sandwiching the anti-fusion member 25 between the both end portions 4f, so as shown in Figures 75, 77 and 79, the bag body 3 has a heat-sealable portion 3d where both end portions 4f of the resin film 4 are joined together.

[0178] Next, as shown in FIGS. 80 and 81, the surface 3s of the bag body 3 and the surface 2a of the base material 2 are placed together so as to face each other.

[0179] Then, with, for example, adhesive or double-sided tape applied to the surface 2a of the base material 2 (or the surface 3s of the bag body 3), the surface 3s of the bag body 3 and the surface 2a of the base material 2 are brought into contact and laminated together, and the bag body 3 is attached to the base material 2, thereby producing the packaging cushioning material 80 of this embodiment shown in Figures 75 to 77 and 82.

[0180] Also, as shown in Figures 75 to 77, the bag body 3 in this packaging cushioning material 80 has a fixing portion 3e that fixes the packaged item 30 by contacting at least the entire side surface of the packaged item 30 stored in the packaging container (i.e., placed inside the packaging container).

[0181] <How to pack items> Next, a method for packaging an object using the cushioning material for packaging of this embodiment will be described.

[0182] First, as shown in Fig. 83, a packaging container 100 (in an unfolded state) is prepared in which the packaged item 30 and the packaging cushioning material 80 are stored. This packaging container 100 is not particularly limited, and examples thereof include boxes and bags made of paper or resin, and examples thereof include the cardboard box shown in Fig. 83 (the well-known A-type cardboard box).

[0183] The packaging container 100 includes side portions 100a to 100d connected to one another, a joint portion 100e connected to the side portion 100a, an upper outer flap 100f, and a lower outer flap 100g, an upper inner flap 100h and a lower inner flap 100i connected to the side portion 100b, an upper outer flap 100j and a lower outer flap 100k connected to the side portion 100c, and an upper inner flap 100m and a lower inner flap 100n connected to the side portion 100d. The joint portion 100e is also formed with a hole 100p for arranging a part of the air supply portion 10 (air supply hole 12 provided with air supply valve 13) from the inside of the packaging container 100 to the outside.

[0184] Next, as shown in Figure 84, the side portions 100a to 100d of the packaging container 100 are used as base material 2, and with, for example, adhesive or double-sided tape applied to the surfaces of the side portions 100a to 100d (or surface 3s of the bag body 3), the surface 3s of the bag body 3 is brought into contact with the surfaces of the side portions 100a to 100d and laminated, and the bag body 3 is attached to the side portions 100a to 100d to prepare a packaging cushioning material 80 comprising the side portions 100a to 100d that serve as base material 2 and the bag body 3.

[0185] In this case, as shown in Figure 84, a part of the air supply section 10 (air supply hole 12 provided with an air supply valve 13) is positioned from the inside of the packaging container 100 toward the outside through a hole 100p formed in the packaging container 100.

[0186] Next, in the unfolded packaging container 100 shown in Figure 84, the side portion 100a and the side portion 100d are attached using the joint 100e, and the bottom portion of the packaging container 100 is formed by folding the lower inner flaps 100i, 100n and the lower outer flaps 100g, 100k toward the inside of the packaging container 100, and after assembling it as shown in Figure 85, the item to be packaged 30 is placed on the bottom portion of the packaging container 90 as shown in Figure 86.

[0187] Next, from the state shown in Figure 86, the upper inner flaps 100h, 100m and the upper outer flaps 100f, 100j are folded toward the inside of the packaging container 100 to seal the lid of the packaging container 100, and the bag body 3 of the packaged item 30 and the packaging cushioning material 80 is stored inside the packaging container 100 as shown in Figure 87.

[0188] Then, in the state shown in Fig. 87, when a straw-shaped device is inserted into the air supply valve 13 of the air supply unit 10 and air is supplied to the bag body 3, as shown in Figs. 88 to 90 (Fig. 89 is a JJ cross-sectional view of Fig. 88, and Fig. 90 is a KK cross-sectional view of Fig. 88), both end portions 3f stored inside the bag body 3 expand outward from the bag body 3, and in conjunction with the expansion of both end portions 3f, the fixing portions 3e expand towards the packaged item 30, and the bag body 3 is opened. In accordance with the shape of the packaged item 30, the fixing portion 3e of the bag body 3 flexibly wraps around multiple surfaces of the packaged item 30 (i.e., the entire side surface of the packaged item 30 (left and right surfaces 30b, 30c and front and rear surfaces 30d, 30e) and the top surface 30a), and the fixing portion 3e comes into contact with the entire surface (i.e., the top surface and side surfaces) of the packaged item 30 stored in the packaging container 100 (i.e., placed inside the packaging container 100), and the packaged item 30 is fixed by the fixing portion 3e.

[0189] As described above, the cushioning material 80 of this embodiment can provide the same effects as those provided by the cushioning material 1 of the first embodiment.

[0190] [Other forms] In each of the above-described embodiments, the resin film forming the bag body 3 has been described as an example of a resin film 4 having a three-layer structure comprising a surface layer 6, a surface layer 7 provided on one side of the surface layer 6, and an intermediate layer 8 provided between the surface layers 6 and 7, and the intermediate layer 8 and the surface layers 6 and 7 laminated on the surface of the intermediate layer 8. However, the resin film is not particularly limited as long as it contains the above-described lubricant.

[0191] <Resin film with a single-layer structure> For example, the bag 3 may be formed from a resin film having a single-layer structure consisting of only the surface layer 6 (or only the surface layer 7). In this case, for example, after obtaining the thermoplastic resin composition for forming the surface layer, an extruder equipped with a T-die is used to extrude the thermoplastic resin composition at a predetermined temperature, and a cast film process is used to obtain a resin film having a single-layer structure consisting of only the surface layer 6 (or only the surface layer 7). Next, for example, when producing a packaging cushioning material similar to the packaging cushioning material 1 in the first embodiment described above, a bag made of a resin film is produced in the same manner as in FIGS. 5 to 6 described above, and then the surface of the bag and the surface of the substrate are overlapped so that they face each other, and then the bag is attached to the substrate in the same manner as in FIGS. 7 to 9, whereby a packaging cushioning material similar to the packaging cushioning material 1 shown in FIGS. 1 to 3 and 10 can be produced.

[0192] Furthermore, the thickness of the resin film having a single-layer structure consisting of only a surface layer is not particularly limited, but from the viewpoints of reducing costs, improving flexibility, and facilitating deformation when air is supplied, it is preferably 10 to 60 μm, more preferably 15 to 50 μm, and even more preferably 20 to 40 μm.

[0193] <Resin film with a two-layer structure> Alternatively, the bag body 3 may be formed from a resin film having a two-layer structure in which only the surface layers 6 and 7 are provided, without providing the intermediate layer 8, and the surface layer 6 and the surface layer 7 are laminated in this order. In this case, for example, after obtaining the thermoplastic resin composition for forming the surface layer described above, the thermoplastic resin composition for forming the surface layer is extruded at a predetermined temperature using an extruder equipped with a T-die, and a resin film having a two-layer structure having the surface layer 6 and the surface layer 7 provided on one side of the surface layer 6 is obtained by a cast film process. Next, for example, when manufacturing a packaging cushioning material similar to the packaging cushioning material 1 in the first embodiment described above, a bag body made of a resin film is manufactured in the same manner as in FIGS. 5 to 6 described above, and then the surface of the bag body and the surface of the substrate are overlapped with each other so that they face each other, and then the bag body is attached to the substrate, thereby manufacturing a packaging cushioning material similar to the packaging cushioning material 1 shown in FIGS. 1 to 3 and 10.

[0194] When producing a bag by heat-sealing two resin films together, the outer layer of the bag (i.e., the surface layer on the outer surface side of the bag that comes into contact with the packaged item when the packaged item is packaged) may contain the above-mentioned lubricant, but it is preferable that the inner layer of the bag (i.e., the surface layer on the inner surface side of the bag that is heat-sealed) also contains a lubricant. If the inner layer of the bag contains a lubricant, the slipperiness of the inner layer is improved, making it less likely for the films to stick together when the bag is filled with air, and making it easier to inflate the bag.

[0195] More specifically, for example, when preparing two resin films having a two-layer structure in which surface layer 6 / surface layer 7 (i.e., inner layer / outer layer) are laminated in that order, and the surface layers 6 of each resin film are heat-sealed together to produce a bag, it is sufficient that the surface layer 7 (i.e., outer layer) located on the outside of the bag contains a lubricant. However, if the surface layer 6 (i.e., inner layer) located on the inside of the bag contains a lubricant, the slipperiness of the surface layer 6 is improved, making it possible to easily inflate the bag when filling it with air.

[0196] In the case of a resin film having a two-layer structure composed of surface layers 6 and 7, the surface layer 6 may be made of a thermoplastic resin different from the thermoplastic resin forming the surface layer 7.

[0197] For example, in order to increase the difference in melting point between the surface layer and the olefin-based resin and thereby improve heat sealing properties, one surface layer may be made of a polyethylene-based resin with a low melting point and the other surface layer may be made of a polypropylene-based resin with a high melting point.

[0198] Alternatively, for example, a low-density polyethylene may be used for the inner surface layer of the bag, and a high-density polyethylene for the outer surface layer of the bag. In this case, the difference in melting point between the low-density polyethylene in the inner surface layer and the high-density polyethylene in the outer surface layer is large, improving heat-sealability and enabling the provision of a bag that is certified as a mono-material, thereby improving recyclability.

[0199] Furthermore, from the viewpoint of improving compatibility with the thermoplastic resin in the outer surface layer of the bag body and improving isotropy, it is preferable that the outer surface layer of the bag body contains the above-mentioned olefin-based elastomer.

[0200] Furthermore, from the viewpoint of improving the conformability of the resin film to the packed item, the inner surface layer of the bag preferably contains a propylene-based elastomer. Furthermore, when a propylene-based elastomer is used, from the viewpoint of improving flexibility, the content of α-olefin units such as ethylene copolymer is preferably 5% by mass or more, more preferably 10% by mass or more, and even more preferably 15% by mass or more. Furthermore, when a propylene-based elastomer is used, from the viewpoint of improving rigidity, the content of α-olefin units such as ethylene copolymer is preferably less than 5% by mass, more preferably less than 4.5% by mass, and even more preferably 4% by mass or less.

[0201] The thickness of the two-layer resin film composed of the surface layers 6 and 7 is not particularly limited, but from the viewpoints of reducing costs, improving flexibility, and facilitating deformation when air is supplied, it is preferably 20 to 60 μm, more preferably 30 to 50 μm, and even more preferably 35 to 45 μm. The thickness of the surface layers 6 and 7 is not particularly limited, and can be, for example, 10 to 30 μm.

[0202] Furthermore, in each of the above-described embodiments, the bag body 3 is attached to the base material 2, but a configuration may also be adopted in which a lid of a paper or resin packaging container is used instead of the base material 2. More specifically, for example, as shown in Fig. 54, a packaging container (e.g., a cardboard box) 21 made of paper and including a container body 21a and a lid 21b provided separately from the container body 21a may be prepared, the lid 21b may be used as the base material 2, the bag body of the present invention (e.g., the bag body 3 in the above-described first embodiment) may be attached to the lid 21b, and a packaging cushioning material 95 including the bag body 3 and the lid 21b serving as the base material may be used.

[0203] With this type of cushioning material for packing 95, it is possible to obtain the same effects as those obtained with the cushioning material for packing 1 in the first embodiment described above.

[0204] In this case, for example, a hole 20e for arranging a part of the air supply unit 10 (air supply hole 12 provided with air supply valve 13) can be formed in the container body 21a.

[0205] Furthermore, for example, instead of the lid 21b provided separately from the container body 21a described above, a lid integrated with the container body of a packing container such as a cardboard box can also be used.

[0206] 76, a configuration may be used in which the bag body 3 shown in FIG. 91 is used in which both end portions 3f are folded inward so that the end portions 3f partially overlap. With this configuration, when air is supplied to the bag body 3, both end portions 3f stored inside the bag body 3 greatly expand outward from the bag body 3, and in conjunction with the expansion of the both end portions 3f, the fixing portions 3e are more likely to expand toward the packaged item 30, making it even easier to fix the packaged item 30. Note that the bag body 3 shown in FIG. 91 may be used in which the bag body 3 shown in FIG. 92 is used in which both end portions 3f are folded outward so that the end portions 3f partially overlap. [Example]

[0207] The present invention will be described below based on examples. However, the present invention is not limited to these examples, and these examples can be modified or changed based on the spirit of the present invention, and such modifications are not excluded from the scope of the present invention.

[0208] The materials used to prepare the resin film are listed below. (1) LDPE: Low-density polyethylene, melting point: 111°C, density: 0.922 g / cm 3 MFR (190°C): 0.3 g / 10 min (manufactured by Sumitomo Chemical Co., Ltd., trade name: Sumikasen, F101-1) (2) LLDPE: Linear low-density polyethylene, melting point: 120°C, density: 0.913 g / cm 3 MFR (190°C): 2.0 g / 10 min (manufactured by Tosoh Corporation, product name: Nipolon-Z ZF220) (3) R-PP: Random polypropylene, melting point: 152°C, density: 0.900 g / cm 3 MFR (230°C): 6.7 g / 10 min (Prime Polymer Co., Ltd., product name: F227) (4) B-PP: Block polypropylene, melting point: 157°C, density: 0.900 g / cm 3 MFR (230°C): 8.0 g / 10 min (Japan Polypropylene Corporation, product name: Waymax MFX3) (5) HDPE: High-density polyethylene, melting point: 134°C, density: 0.954 g / cm 3 MFR (190°C): 1.0 g / 10 min (manufactured by Prime Polymer Co., Ltd., product name: Neozex 5510F) (6) SIS elastomer 1: styrene unit content: 48 mass%, density: 0.980 g / cm 3 MFR (200°C): 14 g / 10 min (manufactured by Zeon Corporation, product name: Quintac 3390) (7) SIS elastomer 2: styrene unit content: 14% by mass, density: 0.930 g / cm 3 MFR (200°C): 9g / 10min (manufactured by Zeon Corporation, product name: Quintac 3620) (8) SIS elastomer 3: styrene unit content: 18% by mass, density: 0.930 g / cm 3 MFR (200°C): 10g / 10min (manufactured by Zeon Corporation, product name: Quintac 3440) (9) Propylene-based elastomer 1: Propylene-ethylene copolymer elastomer, ethylene unit content: 16 mass%, density: 0.862 g / cm 3 MFR (230°C): 3.0 g / 10 min (manufactured by ExxonMobil Corporation, trade name: Vistamax (registered trademark) 6102FL) (10) Propylene-based elastomer 2: propylene-ethylene copolymer elastomer, ethylene unit content: 4 mass%, density: 0.889 g / cm 3 MFR (230°C): 8.0 g / 10 min (manufactured by ExxonMobil Corporation, trade name: Vistamax (registered trademark) 3588) (11) Ethylene-based elastomer: ethylene-octene copolymer elastomer, density: 0.866 / cm 3 MFR (190°C): 0.5 g / 10 min (Dow Chemical, trade name: Infuse 9007) (12) Inorganic filler: calcium carbonate, average particle size: 1.8 μm (manufactured by Shiraishi Calcium Co., Ltd., product name: PO-120B-10)

[0209] Example 1 <Preparation of resin film> First, the materials shown in Table 1 were mixed to prepare a thermoplastic resin composition for forming an intermediate layer and a thermoplastic resin composition for forming a surface layer, each having the composition (parts by mass) shown in Table 1. Next, the thermoplastic resin composition for forming the surface layer was extruded into a strand shape using a co-rotating twin-screw extruder (manufactured by JSW Corporation, product name: TEX28V-42CW-4V) equipped with a strand die under a condition of 200°C, and then cut to obtain pellets for forming the surface layer.

[0210] Next, using an extruder equipped with a T-die (manufactured by Labotec), the thermoplastic resin composition for forming the intermediate layer and the pellets for forming the surface layer were extruded at 200°C, and a cast film process was used to form a film having an intermediate layer, a first surface layer formed on a first side of the intermediate layer, and a second surface layer formed on a second side of the intermediate layer.The film was then wound up on a take-up roll to produce a resin film (length: 25 cm, width: 35 cm) with the thickness shown in Table 1 and a three-layer structure in which the first surface layer / intermediate layer / second surface layer were laminated in that order.

[0211] <Making the bag> Next, the first surface layers of the two resin films were placed face to face on top of each other, and a commercially available film valve (manufactured by Takara Kosan Co., Ltd.) serving as an air supply section was inserted between the two resin films, sandwiching the air supply section between the first surface layers of the two resin films.

[0212] Next, the four opposing sides of the first surface layers of the two resin films were joined together by heat sealing (temperature: 140°C, time: 1 second), and part of the air supply section was joined to the two resin films, thereby producing a bag body formed from a resin film with an air supply section attached and having a space section formed inside the resin film.

[0213] <Production of packaging cushioning material> Next, both ends of the bag were folded in the longitudinal direction of the bag to overlap portions of the bag, and the surface of the bag was placed face-to-face with the surface of the substrate (corrugated cardboard measuring 26 cm in length, 22 cm in width, and 0.5 cm in thickness). Then, with adhesive applied to the surface of the substrate, the surface of the bag and the surface of the substrate were brought into contact and laminated, and the bag was attached to the substrate, thereby producing the cushioning material for packaging shown in Figures 1 to 3 and 10 described above.

[0214] <Packaging of items> Next, a cardboard box (a rectangular box measuring 26 cm in length, 22 cm in width, and 9 cm in depth, with four lids and holes formed, as in Figure 13 above) was prepared as a packaging container to store the items to be packaged and the packaging cushioning material, and the items to be packaged (a rectangular box measuring 14 cm in length, 17 cm in width, and 7 cm in depth) were placed inside the cardboard box, as in Figure 14 above.

[0215] Next, similar to Figure 15 above, packing cushioning material was placed on top of the item to be packed and stored inside the cardboard box, and similar to Figure 16 above, part of the air supply section (air supply hole with an air supply valve) was positioned facing outward from the inside of the cardboard box through a hole formed in the cardboard box.

[0216] Next, as in Figure 17 above, the lid of the cardboard box was sealed and a straw-like device was inserted into the air supply valve of the air supply unit to supply air to the bag body and inflate it.As in Figure 18 above, the bag body inflated smoothly while flexibly deforming to follow the shapes of the cardboard box and the packaged item, and the first and second fixing parts of the bag body flexibly wrapped around multiple sides of the packaged item to accommodate the shape of the packaged item, allowing the first and second fixing parts to securely fix the packaged item.

[0217] Examples 2 to 24 A resin film having the thickness shown in Tables 1 to 3 and a three-layer structure in which the first surface layer / intermediate layer / second surface layer were laminated in that order was produced in the same manner as in Example 1 above, except that the composition (parts by mass) of the surface layer, the composition (parts by mass) of the intermediate layer, and the thicknesses of the surface layer and intermediate layer were changed to the conditions shown in Tables 1 to 3.

[0218] Then, in the same manner as in Example 1 described above, a bag body was produced, and packaging cushioning material was produced, and the packaged item was packaged.As in Example 1 described above, the packaged item was able to be securely fixed by the first fixing portion and the second fixing portion of the packaging cushioning material in each of Examples 2 to 24.

[0219] Example 25 <Preparation of resin film> First, the materials shown in Table 4 were mixed to prepare a thermoplastic resin composition having the composition (parts by mass) shown in Table 4. Next, the thermoplastic resin composition was extruded into a strand shape at 200°C using a co-rotating twin-screw extruder (manufactured by JSW Corporation, product name: TEX28V-42CW-4V) equipped with a strand die, and then cut to obtain pellets for film formation.

[0220] Next, using an extruder equipped with a T-die (manufactured by Labotec), the film-forming pellets were extruded at 200°C to form a film using the cast film process method, and the film was wound up on a take-up roll to produce a single-layer resin film (length: 25 cm, width: 35 cm) with the thickness shown in Table 4.

[0221] <Making the bag> Next, two resin films were placed opposite each other and overlapped, and a commercially available film valve (manufactured by Takara Kosan Co., Ltd.) serving as an air supply section was inserted between the two resin films, sandwiching the air supply section between the two resin films.

[0222] Next, the four opposing sides of the two resin films were joined together by heat sealing (temperature: 140°C, time: 1 second), and part of the air supply section was joined to the two resin films, thereby producing a bag formed from a resin film with an attached air supply section and having a space section formed inside the resin film.

[0223] Then, in the same manner as in Example 1 described above, a cushioning material for packaging was produced and the packaged item was packaged. As in Example 1 described above, the packaged item was securely fixed by the first fixing part and the second fixing part of the cushioning material for packaging.

[0224] (Examples 26 to 27) A single-layer resin film having the thickness shown in Table 4 was produced in the same manner as in Example 25 above, except that the film composition (parts by mass) was changed to the conditions shown in Table 4.

[0225] Then, in the same manner as in Example 1 described above, a bag body was produced, a packaging cushioning material was produced, and the packaged item was packaged. As in Example 1 described above, the packaged item was securely fixed by the first fixing portion and the second fixing portion of the packaging cushioning material.

[0226] Example 28 <Preparation of resin film> First, the materials shown in Table 5 were mixed to prepare a thermoplastic resin composition for forming an outer layer and a thermoplastic resin composition for forming an inner layer (heat seal layer), each having the composition (parts by mass) shown in Table 5. Next, the thermoplastic resin composition for forming the inner layer and the thermoplastic resin composition for forming the outer layer were extruded into strands at 200°C using a co-rotating twin-screw extruder (manufactured by JSW Corporation, product name: TEX28V-42CW-4V) equipped with a strand die, and then cut to obtain pellets for forming the inner layer and pellets for forming the outer layer.

[0227] Next, using an extruder (manufactured by Labotec) equipped with a T-die, the pellets for forming the inner layer and the pellets for forming the outer layer were extruded at 200°C, and a film having an inner layer and an outer layer formed on the surface of the inner layer was formed using a cast film process method.The film was then wound up on a winding roll to produce a resin film (length: 25 cm, width: 35 cm) with a two-layer structure in which the inner layer and the outer layer were laminated in that order, and having the thickness shown in Table 5.

[0228] <Making the bag> Next, the inner layers of the two resin films were placed face to face on top of each other, and a commercially available film valve (manufactured by Takara Kosan Co., Ltd.) serving as an air supply section was inserted between the two resin films, sandwiching the air supply section between the inner layers of the two resin films.

[0229] Next, the four opposing sides of the inner layers of the two resin films were joined together by heat sealing (temperature: 140°C, time: 1 second), and a part of the air supply section was joined to the two resin films, thereby producing a bag formed by the resin film to which the air supply section was attached and which had a space section formed inside the resin film.

[0230] Then, in the same manner as in Example 1 described above, a cushioning material for packaging was produced and the packaged item was packaged. As in Example 1 described above, the packaged item was securely fixed by the first fixing part and the second fixing part of the cushioning material for packaging.

[0231] (Examples 29 to 33) A resin film having a two-layer structure with an inner layer / outer layer laminated in that order was produced in the same manner as in Example 28 described above, except that the film composition (parts by mass) was changed to the conditions shown in Table 5. The thickness was as shown in Table 5.

[0232] Then, in the same manner as in Example 1 described above, a bag body was produced, a packaging cushioning material was produced, and the packaged item was packaged. As in Example 1 described above, the packaged item was securely fixed by the first fixing portion and the second fixing portion of the packaging cushioning material.

[0233] [Table 1]

[0234] [Table 2]

[0235] [Table 3]

[0236] [Table 4]

[0237] [Table 5] [Industrial Applicability]

[0238] As described above, the present invention is suitable for use as a cushioning material for packaging. [Explanation of symbols]

[0239] 1. Packaging cushioning material 2 Base material 3 Bag body 3a 1st fixed part 3b Second fixed part 4 Resin film 6 Surface layer (first layer, second layer) 7 Surface layer (first layer, second layer) 8. Middle Class 10 Air supply section 11 Main unit 12 Air supply hole 13 Air supply valve 20 Packaging container 20a~20d Lid 20e hole 30 Items to be packed

Claims

1. A packaging cushioning material including at least a bag body, The bag body is made of a resin film having a first layer containing a thermoplastic resin and a lubricant.

2. 2. The cushioning material for packaging according to claim 1, wherein the lubricant is an inorganic lubricant.

3. 3. The cushioning material for packaging according to claim 1, wherein the thermoplastic resin is an olefin-based resin.

4. 4. The cushioning material for packaging according to claim 3, wherein the olefin-based resin is at least one of a polyethylene-based resin and a polypropylene-based resin.

5. 3. The packaging cushioning material according to claim 1, wherein the resin film has a second layer containing the thermoplastic resin and the lubricant on one side of the first layer.

6. 6. The cushioning material for packaging according to claim 5, wherein the resin film has an intermediate layer containing a thermoplastic elastomer between the first layer and the second layer.

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