Packaging film for collectibles

Abstract

We provide packaging film for collected items that indicates when it is time to replace them. [Solution] The packaging film 1 for collected materials according to the present disclosure comprises a film portion 10 that forms a bag that conforms to the shape of the collected material and covers the collected material, an opening 20 placed in the bag into which the collected material is inserted, a sealing portion 30 that closes the opening 20 and seals the inside of the bag, and a humidity indicator portion 40 placed in the bag that changes its state according to the humidity history inside the bag.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a packaging film for collectibles. BACKGROUND ART

[0002] Shoes including sneakers or leather shoes have problems such as discoloration due to ultraviolet rays, hydrolysis of urethane used in the sole portion caused by moisture that is particularly prone to occur in Japan under high temperature and high humidity, or mold growth. To solve these problems, it is conceivable to use airtight bags or storage containers. However, many of these are often shunned by collectors for reasons such as poor appearance.

[0003] For example, Patent Document 1 discloses a shoe storage bag characterized in that a bag made of a material capable of maintaining airtightness is shaped to fit the outer surface of a shoe, the foot insertion opening, and the inside of the foot insertion opening, and is provided with a shoe insertion opening that can maintain airtightness for placing any shoe therein, and a suction port for evacuating internal air. Further, Patent Document 2 discloses a compression bag characterized by having a zipper portion for sealing a bag body capable of storing shoes therein and a bag body to be inserted into the interior of the shoe, whereby air inside the shoe (the portion for inserting a foot) is evacuated to enable compression even from the inside of the shoe.

[0004] On the other hand, trading cards (also referred to as collectible cards) are gaining popularity worldwide not only for gaming purposes but also as objects for appreciation or collection. Since the rarity or transaction price of such trading cards varies greatly depending on the difference in the type of pattern, photograph, or special processing applied to the surface of a base material main body mainly made of paper and / or polyolefin resin, there is a demand for a film capable of storing trading cards for a long period of time.

[0005] For example, Patent Document 3 discloses a trading card comprising two card pieces, a front and a back, with windows at different positions; an intermediate card piece having an opening slightly larger than those windows; and a thin plate-like object that is approximately the same size as the opening of the intermediate card piece and related to the patterns provided on the two card pieces, the two card pieces being attached to the intermediate card piece so as to hold the thin plate-like object in the opening of the intermediate card piece. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 9-240747 [Patent Document 2] Japanese Patent Publication No. 2020-169040 [Patent Document 3] Japanese Patent Publication No. 2002-79781 [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] In recent years, in addition to the bags described in Patent Documents 1 and 2 above, heat-shrinkable packaging materials that offer both good appearance and longevity have become available. However, these heat-shrinkable packaging materials have not become widespread due to their disposable nature, the need for heat shrinking which requires a certain level of skill, and the time and effort involved.

[0008] Furthermore, when storing shoes, desiccants are often placed inside the shoe packaging bag to absorb moisture. However, the effectiveness of desiccants diminishes after a certain period. Once the desiccant's effect wears off, the moisture inside the bag tends to increase. Conventional technology has not adequately considered how to determine when to replace the bag based on its humidity history.

[0009] Similarly, the trading cards described in Patent Document 3 also did not adequately consider how to make it easy to understand when to replace the bags.

[0010] Therefore, this disclosure aims to solve the problems of the above-mentioned prior art and provide a packaging film for collected materials that indicates when it is time to replace it. [Means for solving the problem]

[0011] The gist of this disclosure, which addresses the above issues, is as follows:

[0012] [1] A packaging film for collectibles, A film portion that forms a bag that covers the collected items in accordance with the shape of the collected items, The bag is arranged and has an opening into which the collected material is inserted, A sealing portion that closes the opening and seals the inside of the bag, A humidity indicator unit is placed in the bag and changes its state according to the humidity history inside the bag, Equipped with, Packaging film for collectibles.

[0013] [2] [1] The packaging film described above, The opening and the sealing portion are located at the heel, bottom, or top of the bag. Packaging film.

[0014] [3] The packaging film described in [1] or [2], The sealing portion includes a fastener, Packaging film.

[0015] [4] The packaging film described in [1] or [2], The sealing portion includes a lid having a first member and a second member that screw together to sandwich the film portion and close the opening. A packaging film.

[0016] [5] The packaging film according to any one of claims 1 to 4, wherein the collected article includes a shoe, the sealing part closes the opening inside the shoe entry of the shoe. A packaging film.

[0017] [6] The packaging film according to any one of claims 1 to 5, wherein the humidity indicator part is arranged on the inner surface of the bag facing the surface of the shoe included in the collected article or on the inner surface of the bag facing the shoe entry of the shoe. A packaging film.

[0018] [7] The packaging film according to claim 6, wherein the surface includes a portion adjacent to the bottom on the side surface or the back surface of the shoe. A packaging film.

[0019] [8] The packaging film according to any one of claims 1 to 7, further comprising a folding part that transitions between a first state in which the bag is folded and a second state in which the bag has a three-dimensional shape. The packaging film further comprising a folding part that transitions between a first state in which the bag is folded and a second state in which the bag has a three-dimensional shape. A packaging film.

[0020] [9] The packaging film according to claim 8, wherein the folding part is arranged at the top, the bottom, or the heel part of the bag. A packaging film.

[0021]

[10] The packaging film according to claim 8 or 9, wherein the folding part is arranged at a position different from the opening and the sealing part. A packaging film.

[0022]

[11] A packaging film described in any one of [1] to

[10] , The film portion has a layered structure including at least one of an ultraviolet-cutting layer and a barrier coating layer. Packaging film.

[0023]

[12]

[11] The packaging film described above, The barrier coating layer has UV-blocking properties. Packaging film.

[0024]

[13] A packaging film described in any one of [1] to

[12] , The aforementioned collectibles include cards, Packaging film. [Effects of the Invention]

[0025] According to this disclosure, it is possible to provide packaging film for collected items that indicates when it is time to replace it. [Brief explanation of the drawing]

[0026] [Figure 1] This is a schematic external perspective view showing a first example of the configuration of a packaging film for collected materials according to one embodiment of the present disclosure. [Figure 2] This is a schematic external perspective view showing a second example of the configuration of a packaging film according to one embodiment of the present disclosure. [Figure 3] This is a schematic rear view showing a third example of the configuration of a packaging film according to one embodiment of the present disclosure. [Figure 4] This is a schematic side view showing the structure of the packaging film in Figure 1. [Figure 5] This is a schematic side view showing a fourth example of the configuration of a packaging film according to one embodiment of the present disclosure. [Figure 6] This is a schematic side view showing a fifth example of the configuration of a packaging film according to one embodiment of the present disclosure. [Figure 7]This is a schematic external perspective view showing a sixth example of the configuration of a packaging film according to one embodiment of the present disclosure. [Figure 8] This is a schematic external perspective view showing a seventh example of the configuration of a packaging film according to one embodiment of the present disclosure. [Figure 9] Figure 8 is a schematic side view showing the structure of the packaging film. [Figure 10] This is a schematic side view showing an eighth example of the configuration of a packaging film according to one embodiment of the present disclosure. [Figure 11] This is a schematic cross-sectional view showing one embodiment of the packaging film of the present disclosure. [Figure 12] This is a schematic cross-sectional view showing another embodiment of the packaging film of the present disclosure. [Figure 13] This is a schematic cross-sectional view showing yet another embodiment of the packaging film of the present disclosure. [Figure 14] This is a first schematic diagram showing an example of the configuration of a packaging film relating to the first modified example of this disclosure. [Figure 15] This is a second schematic diagram showing an example of the structure of a packaging film relating to the first modified example of this disclosure. [Figure 16] This is a schematic diagram showing an example of the structure of a packaging film relating to the second modified example of this disclosure. [Modes for carrying out the invention]

[0027] In the following, one embodiment of this disclosure will be mainly described with reference to the attached drawings.

[0028] Figure 1 is a schematic external perspective view showing a first example of the configuration of the packaging film 1 for collected materials according to one embodiment of the present disclosure. Figure 2 is a schematic external perspective view showing a second example of the configuration of the packaging film 1 according to one embodiment of the present disclosure. Figure 3 is a schematic rear view showing a third example of the configuration of the packaging film 1 according to one embodiment of the present disclosure. An example of the configuration and function of the packaging film 1 according to one embodiment will be mainly described with reference to Figures 1 to 3.

[0029] The packaging film 1 is, for example, a bag-shaped film used for packaging collectibles. In this disclosure, “collectibles” include, for example, shoes. The packaging film 1 is bag-shaped so that it can enclose shoes. The packaging film 1 may be formed in the shape of a shoe. Forming the packaging film 1 in the shape of a shoe can improve the appearance when shoes are packaged in it.

[0030] In this disclosure, “shoes” includes, for example, footwear designed to protect and support the wearer’s feet and to adequately mitigate contact with the ground. Shoes include, for example, sneakers or leather shoes. Packaging film 1 may be used, for example, by collectors, etc., for long-term storage of shoes for display purposes, or by retailers, etc., for short-term storage of shoes for sale. Packaging film 1 may be, for example, configured as an entirely transparent film to suit display purposes.

[0031] The packaging film 1 has a film portion 10, an opening 20, a sealing portion 30, and a humidity indicator portion 40.

[0032] The film portion 10 forms a bag that covers the shoe, conforming to the shape of the shoe. In this disclosure, "conforming to the shape of the shoe" means, for example, that when the shoe is placed in the packaging film 1, the surface of the film portion 10 conforms to the surface of each component of the shoe, such as the toe, heel, bottom, opening, and sides. The film portion 10 is, for example, entirely transparent. The film portion 10 has a laminated structure, for example, and its details will be described later, but it is not limited to this. The film portion 10 does not have to have a laminated structure.

[0033] The opening 20 is located in the bag, which is made up of the film portion 10. A shoe is inserted into the opening 20. The opening 20 is configured as a guide opening for accommodating the entire shoe, including the bottom and the opening, inside the bag, for example, with the toe portion leading and the shoe being inserted into the bag from diagonally above the opening 20. The perimeter of the opening 20 is surrounded, for example, by the annular edge portion of the film portion 10. In the examples shown in Figures 1 to 3, the opening 20 is located at the top of the bag, corresponding to the opening of the shoe.

[0034] The sealing portion 30 closes the opening 20 and seals the inside of the bag. The sealing portion 30 includes, for example, a fastener. In this disclosure, “fastener” includes, for example, Ziploc®, zippers, or zip fasteners. In the examples shown in Figures 1 to 3, the sealing portion 30 is located together with the opening 20 at the top of the bag corresponding to the opening of the shoe.

[0035] The fastener of the sealing portion 30 is positioned along the annular edge of the film portion 10 that constitutes the opening of the opening 20. The fastener of the sealing portion 30 engages and separates one half and the other half of the edge with a pair of mutually complementary engaging members in an openable and closable fastener. The fastener of the sealing portion 30 closes and opens the opening 20, for example, by engaging and separating the pair of engaging members through the movement of a slider.

[0036] The humidity indicator unit 40 is placed in a bag made of film unit 10 and changes its state according to the humidity history inside the bag. In this disclosure, the "state" of the humidity indicator unit 40 includes, for example, color tone or hue. The humidity indicator unit 40 is configured such that, for example, its color tone or hue changes when it has absorbed a certain amount of water vapor according to the humidity history. The humidity indicator unit 40 is laminated integrally with the film unit 10, for example, as described later, to form a laminated structure together with the film unit 10. However, the humidity indicator unit 40 may be attached as a separate component to the inner surface of the film unit 10 by any mounting method including, for example, adhesive, joining, screwing, engaging, locking, or fitting.

[0037] The humidity indicator section 40 is located on at least a portion of the inner surface of the film section 10. The humidity indicator section 40 is located on only a portion of the inner surface of the film section 10, for example, as shown in Figures 1 to 3. In the first example shown in Figure 1, the humidity indicator section 40 is located on the inner surface of the bag facing the opening of the shoe.

[0038] The humidity indicator unit 40 may be located on the inner surface of the bag facing the surface of the shoe. In this disclosure, the “surface” of the shoe includes, for example, the side of the shoe or the back of the shoe adjacent to the bottom, where the heel is located. For example, as shown in Figure 2, the humidity indicator unit 40 may be located on the inner surface of the bag facing the side of the shoe. For example, as shown in Figure 3, the humidity indicator unit 40 may be located on the inner surface of the bag facing the back of the shoe adjacent to the bottom, where the heel is located.

[0039] The humidity indicator section 40 may be attached to the inner surface of the bag from the back side of the bag formed by the film section 10, or it may be laminated within the laminate film. From the viewpoint of design flexibility, the configuration in which the humidity indicator section 40 is attached from the back side of the bag is preferred, while from the viewpoint of aesthetics, the configuration in which it is laminated within the laminate film is preferred.

[0040] Figure 4 is a schematic side view showing the configuration of the packaging film 1 in Figure 1. Figure 5 is a schematic side view showing a fourth example of the configuration of the packaging film 1 according to one embodiment of the present disclosure. Figure 6 is a schematic side view showing a fifth example of the configuration of the packaging film 1 according to one embodiment of the present disclosure. The variations in the arrangement of the opening 20 and sealing portion 30 in the packaging film 1 will be mainly described with reference to Figures 4 to 6. In Figures 4 to 6, the humidity indicator portion 40 is omitted for the purpose of simple illustration, and only the arrangement relationship of the opening 20 and sealing portion 30 in the film portion 10 is mainly shown.

[0041] As shown in Figures 1 to 4, the opening 20 and sealing portion 30 have been described as being located at the top of the bag, for example, made of the film portion 10, but are not limited to this. As shown in Figure 5, the opening 20 and sealing portion 30 may be located at the bottom of the bag, made of the film portion 10. The bottom of the bag, made of the film portion 10, corresponds to the bottom of the shoe. In this case, the opening 20 may be configured as a guide opening for accommodating the entire shoe, including the shoe from the opening to the bottom, by inserting the shoe into the bag from below the opening 20, with the shoe's opening leading.

[0042] Alternatively, as shown in Figure 6, the opening 20 and the sealing portion 30 may be located at the heel of the bag, which is made up of the film portion 10. The heel of the bag, which is made up of the film portion 10, corresponds to the heel of a shoe. In this case, the opening 20 may be configured as a guide opening for accommodating the entire shoe, including the toe and heel portions, inside the bag, for example, by inserting the shoe into the bag from the rear of the opening 20 with the toe portion leading.

[0043] Figure 7 is a schematic external perspective view showing a sixth example of the configuration of the packaging film 1 according to one embodiment of the present disclosure. The variations in the configuration of the sealing portion 30 in the packaging film 1 will be mainly described with reference to Figure 7. In Figure 7, for the purpose of simple illustration, the humidity indicator portion 40 is omitted from the illustration, and the configuration of the sealing portion 30 in the film portion 10 is mainly shown.

[0044] In the examples shown in Figures 1 to 6, the sealing portion 30 is described as including a fastener, but is not limited to this. The sealing portion 30 may also include a lid having a first member 31 and a second member 32 that screw together to sandwich the film portion 10 and close the opening 20. For example, the first member 31 is a female screw member that rotates relative to the second member 32 when subjected to a rotational operation and screws into the second member 32. The second member 32 is a male screw member that remains stationary while receiving the rotation of the first member 31 and screws into the first member 31 when subjected to a rotational operation.

[0045] The sealing portion 30 may close the opening 20 by screwing the first member 31 and the second member 32 together with a portion of the film portion 10 adjacent to the opening 20 sandwiched between the first member 31 and the second member 32. The sealing portion 30 may also close the opening 20 with a lid including the first member 31 and the second member 32 joined together, thereby sealing the bag made of the film portion 10. In the example shown in Figure 7, the sealing portion 30 closes the opening 20 outside the opening of the shoe S, but is not limited to this. The sealing portion 30 may also close the opening 20 inside the opening of the shoe S. That is, the lid including the first member 31 and the second member 32 screwed together with a portion of the film portion 10 sandwiched between them may be housed inside the opening of the shoe S.

[0046] Figure 8 is a schematic external perspective view showing a seventh example of the configuration of the packaging film 1 according to one embodiment of the present disclosure. The variations in the configuration of the packaging film 1 will be mainly described with reference to Figure 8. In Figure 8, for the purpose of simple illustration, the opening 20, the sealing portion 30, and the humidity indicator portion 40 are omitted from the illustration, and the main focus is on the configuration of the newly arranged folding portion 50 in the film portion 10.

[0047] Unlike the examples shown in Figures 1 to 7, the packaging film 1 may further have a folded portion 50. The folded portion 50 causes a transition between, for example, a first state in which the bag formed by the film portion 10 is folded and a second state in which the bag has a three-dimensional shape. The first state corresponds to the state of the packaging film 1 shown on the right side of Figure 8. The second state corresponds to the state of the packaging film 1 shown on the left side of Figure 8. The folded portion 50 functions as a so-called "gusset," for example, as it is located in a standing pouch.

[0048] As shown in Figure 8, the packaging film 1 is folded thinly by the folding portion 50, transitioning from the second state shown on the left side of Figure 8 to the first state shown on the right side. Conversely, the packaging film 1 maintains its three-dimensional shape independently by transitioning from the first state to the second state by the folding portion 50.

[0049] Figure 9 is a schematic side view showing the configuration of the packaging film 1 in Figure 8. Figure 10 is a schematic side view showing an eighth example of the configuration of the packaging film 1 according to one embodiment of the present disclosure. The variations in the arrangement of the folded portion 50 in the packaging film 1 will be mainly described with reference to Figures 9 and 10. In Figures 9 and 10, for the purpose of simple illustration, the opening 20, sealing portion 30, and humidity indicator portion 40 are omitted from the illustration, and only the arrangement relationship of the folded portion 50 in the film portion 10 is mainly shown.

[0050] The folded portion 50 is positioned, for example, at a different location from the opening 20 and the sealing portion 30. The folded portion 50 may be positioned at the top, bottom, or heel of the bag formed by the film portion 10.

[0051] For example, as shown in Figure 9, the folded portion 50 may be located at the bottom of the bag made up of the film portion 10. In this case, the opening 20 and the sealing portion 30 may be located at positions different from the bottom of the bag made up of the film portion 10. For example, the opening 20 and the sealing portion 30 may be located at the top of the bag made up of the film portion 10, as shown in Figure 4. Alternatively, the opening 20 and the sealing portion 30 may be located at the heel of the bag made up of the film portion 10, as shown in Figure 6.

[0052] For example, as shown in Figure 10, the folded portion 50 may be located at the heel of the bag made up of the film portion 10. In this case, the opening 20 and the sealing portion 30 may be located at positions different from the heel of the bag made up of the film portion 10. For example, the opening 20 and the sealing portion 30 may be located at the top of the bag made up of the film portion 10, as shown in Figure 4. Alternatively, the opening 20 and the sealing portion 30 may be located at the bottom of the bag made up of the film portion 10, as shown in Figure 5.

[0053] The film portion 10 has a layered structure including, for example, at least one of an ultraviolet-cutting layer and a barrier coating layer. The barrier coating layer may, for example, have ultraviolet-cutting properties. The laminated structure of the packaging film 1 will be mainly described below.

[0054] <Definition> In this disclosure, "main component" refers to the component that is most abundant by mass.

[0055] <Packaging film> An embodiment of the packaging film 1 of this disclosure will be described with reference to Figure 11. Figure 11 is a schematic cross-sectional view showing one embodiment of the packaging film 1.

[0056] As shown in Figure 11, the packaging film 1 comprises a base layer 2 and a humidity indicator layer 3. The base layer 2 corresponds to the film portion 10 described above. The humidity indicator layer 3 corresponds to the humidity indicator portion 40 described above. The packaging film 1 described above includes a humidity indicator layer 3, which changes its state according to the humidity history inside the packaging film 1. This can be visually detected, making it possible to determine when it is time to replace the film.

[0057] In this disclosure, the “state” of the humidity indicator layer 3 includes, for example, color tone or hue. A change in the state of the humidity indicator layer 3 includes, for example, a change in color tone or hue. In this disclosure, "change in hue or color" of the humidity indicator layer 3 means that the hue or color before being affected by an external factor is different from the hue or color after being affected by the external factor. Hue refers to the tone of color determined by the relationship between lightness and saturation, and hue refers to the properties of color such as red, yellow, green, and blue. The external factor may be, for example, water vapor. Specifically, depending on the type or composition of the humidity indicator layer 3, this refers to a change from colorless to colored, a change from colored to colorless, a change from a first colored to a second colored, etc. From the viewpoint of appearance, a change from colorless to colored is preferable.

[0058] The packaging film 1 may, for example, be constructed as an entirely transparent film to suit viewing purposes.

[0059] Furthermore, the packaging film 1 is preferably in the shape of a bag so that it can enclose the collectibles inside. It is also preferable that the packaging film 1 is formed to conform to the shape of the collectibles. The collectibles are not limited to these, but examples include the aforementioned shoes and cards, which can be preserved for display.

[0060] (base material layer) The base layer 2 is a layer that supports the humidity indicator layer 3. The base layer 2 may be the outermost layer of the packaging film 1. Therefore, one side of the base layer 2 may be in contact with the external atmosphere.

[0061] The base layer 2 may be a single layer or a laminate composed of two or more layers. From the viewpoint of preservation, it is preferable that the base layer 2 consists of two or more layers. By having two or more layers of base layer 2, preservation can be improved, for example, by enhancing moisture resistance or UV protection. In addition, since the thickness of the packaging film 1 increases when the base layer 2 consists of two or more layers, wrinkles are less likely to occur, and as a result, a better appearance can be expected. Furthermore, if the base layer 2 is a single layer, the base layer 2 may consist of the first base layer 2a described later.

[0062] The average thickness of the substrate layer 2 is not limited, but can be, for example, 10 μm or more and 120 μm or less.

[0063] The average thickness of the base layer 2 is preferably 40% or more, and more preferably 50% or more, of the total thickness of the packaging film 1. A thickness of 45% or more of the total thickness of the packaging film 1 is preferable from the viewpoint of stable seal strength. Furthermore, from the viewpoint of transparency, the thickness of the base layer 2 is preferably 90% or less, and more preferably 80% or less, of the total thickness of the packaging film 1.

[0064] As shown in Figure 12, it is preferable that the base material layer 2 has a first base material layer 2a and a second base material layer 2b. By having two base material layers as the base material layer 2 in this way, storage properties such as moisture resistance can be improved compared to when the base material layer 2 is a single layer. In Figure 12, the first base layer 2a, the second base layer 2b, and the humidity indicator layer 3 are arranged in this order, but the arrangement is not limited to this, and the first base layer 2a may be provided adjacent to the humidity indicator layer 3. In other words, the second base layer 2b, the first base layer 2a, and the humidity indicator layer 3 may be laminated in this order.

[0065] The first base layer 2a and the second base layer 2b may be made of the same components or materials, or they may be made of different components or materials.

[0066] [First base layer] The first substrate layer 2a is a substrate layer 2 that supports the humidity indicator layer 3. The substrate layer 2 may consist only of the first substrate layer 2a, or it may have the first substrate layer 2a and other layers (for example, the second substrate layer 2b described later).

[0067] The first base material layer 2a is, but is not limited to, preferably a layer mainly composed of a polyolefin resin, polyester resin, or polyamide resin, and more preferably a layer made of a polyolefin resin, polyester resin, or polyamide resin. In this disclosure, "main component" refers to the component that is most abundant by mass among the components constituting the layer. Among these, from the viewpoint of moisture resistance, the first base layer 2a is preferably a layer mainly composed of polyolefin resin, more preferably made of polyolefin resin, and in other words, the first base layer 2a is more preferably a polyolefin resin film.

[0068] The polyolefin resin is preferably a resin having one or more α-olefin monomer units. The α-olefin monomers are preferably having 2 to 8 carbon atoms, and examples include ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 4-methyl-1-pentene, 3-methyl-1-pentene, 1-decene, etc., and one or more of these can be used in combination. Examples of preferred polyolefin resins include polyethylene resins and polypropylene resins.

[0069] Examples of the polyethylene-based resins mentioned above include ethylene homopolymers and ethylene-α-olefin copolymers. The α-olefin preferably has 3 to 8 carbon atoms, and examples include propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 4-methyl-1-pentene, 3-methyl-1-pentene, and 1-decene. One or more of these can be used in combination. Examples of polyethylene resins include low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), medium-density polyethylene (MDPE), high-density polyethylene (HDPE), and stretched polyethylene (OPE) and stretched polyethylene (BOPE) obtained by stretching any of these.

[0070] Examples of the polypropylene-based resins mentioned above include polypropylene homopolymers, propylene-α-olefin copolymers, and terpolymers of propylene, ethylene, and α-olefin. The above-mentioned polypropylene resin may have stereoregularity (tacticity). Specifically, it may have any of isotactic, syndiotactic, or attactic stereoregularity, or it may have multiple blocks having any of these stereoregularities. Preferably, the polypropylene resin has an isotactic pentad fraction (mmmm) of 0.5 or more, 0.6 or more, 0.7 or more, 0.8 or more, or 0.9 or more, which indicates the proportion of isotactic polypropylene. When the pentad fraction is indicated, it may also contain 50% or less, 40% or less, 30% or less, 20% or less, or 10% or less of syndiotactic and / or attactic polypropylene having stereoregularity other than isotactic polypropylene.

[0071] The above-mentioned propylene-α-olefin copolymer refers to a copolymer consisting of propylene and at least one selected from α-olefins. The above-mentioned propylene-α-olefin copolymer is preferably a copolymer consisting of propylene and at least one selected from ethylene and α-olefins having 4 to 20 carbon atoms, and more preferably a copolymer consisting of propylene and at least one selected from ethylene and α-olefins having 4 to 8 carbon atoms. Examples of the α-olefins having 4 to 20 carbon atoms include 1-butene, 1-pentene, 1-hexene, 1-octene, 4-methyl-1-pentene, 3-methyl-1-pentene, 1-decene, etc., and one or more of these can be used in combination. The copolymer may be in any form, such as a block copolymer or a random copolymer. As the above-mentioned propylene-α-olefin copolymer, a copolymer of propylene and at least one comonomer selected from ethylene comonomer, butene comonomer, hexene comonomer, and octene comonomer is preferred.

[0072] As the terpolymer of propylene, ethylene, and α-olefin described above, a terpolymer of propylene, ethylene, and an α-olefin such as butene, hexene, or octene can be suitably used. The terpolymer may be in any form, such as a block copolymer or a random copolymer. The polypropylene resins mentioned above may be resins polymerized using catalysts such as Ziegler-Natta catalysts, or resins polymerized using known catalysts such as metallocene catalysts. Preferred polypropylene resins include, for example, stretched polypropylene (OPP) and unstretched polypropylene (CPP).

[0073] Examples of the above-mentioned polyester resins include polyethylene terephthalate (PET), polybutylene terephthalate (BET), and polyethylene naphthalate (PEN).

[0074] Examples of the polyamide resins mentioned above include nylon (stretched nylon (ONy), unstretched nylon (CNy), nylon 6, nylon 66, nylon 11, nylon 12), MXD6, and the like.

[0075] Among the above, the first base material layer 2a is preferably made of stretched polypropylene (OPP), stretched polyethylene (OPE), polyethylene terephthalate (PET), or nylon, and from the viewpoint of excellent moisture resistance, it is preferably made of stretched polypropylene (OPP) or stretched polyethylene (OPE).

[0076] The average thickness of the first substrate layer 2a is not particularly limited, but can be, for example, 10 μm or more and 50 μm or less. The average thickness of the first substrate layer 2a is a value measured using a film thickness gauge.

[0077] [Second base layer] The second substrate layer 2b is one of the layers that may be provided as needed on the substrate layer 2 that supports the humidity indicator layer 3.

[0078] The second base layer 2b is not limited, but is preferably a layer mainly composed of a polyolefin resin, and more preferably a layer made of a polyolefin resin. The term "main component" refers to the component that is most abundant by mass among the components that make up the layer. Specific examples of polyolefin resins are the same as those described in the section on the first base material layer, and the explanation in that section will be used as a reference.

[0079] Furthermore, the second base material layer 2b is preferably made of a polypropylene resin or a polyethylene resin, and more preferably of unoriented polypropylene (CPP) or linear low-density polyethylene (LLDPE). The embodiments of the polypropylene resin and polyethylene resin are the same as those described in the section on the first base material layer, and the explanation in the section on the first base material layer will be applied accordingly.

[0080] Furthermore, a preferred combination of the first base layer 2a and the second base layer 2b is one in which one of the first base layer 2a and the second base layer 2b is made of polyethylene resin and the other is made of polypropylene resin. With such a combination of layers, the packaging film 1 has higher moisture resistance and better preservation properties. More specifically, preferred combinations of the first base layer 2a and the second base layer 2b include a combination of stretched polypropylene (OPP) and unstretched polypropylene (CPP), a combination of stretched polypropylene (OPP) and linear low-density polyethylene (LLDPE), a combination of stretched polyethylene (OPE) and unstretched polypropylene (CPP), and a combination of stretched polyethylene (OPE) and linear low-density polyethylene (LLDPE).

[0081] The average thickness of the second substrate layer 2b is not particularly limited, but can be, for example, 20 μm or more and 120 μm or less. The average thickness of the second substrate layer 2b is a value measured using a film thickness gauge.

[0082] [Functional Layer] As shown in Figure 3, it is preferable that the packaging film 1 of this disclosure has a functional layer 2c as part of the film portion 10 between the first base layer 2a and the second base layer 2b described above. By providing the functional layer 2c, the shelf life and other properties of the packaging film 1 can be improved. The functional layer 2c is not limited to, but examples include a UV-cutting layer and a barrier coating layer. The functional layer 2c may be a single layer or two or more layers. A suitable functional layer 2c is an ultraviolet-cutting layer and / or a barrier coating layer; in other words, preferably, an ultraviolet-cutting layer and / or a barrier coating layer are provided between the first base layer and the second base layer. By providing an ultraviolet-cutting layer, discoloration of the shoes due to ultraviolet rays can be suppressed. Furthermore, by providing a barrier coating layer, gas barrier properties and moisture resistance can be improved.

[0083] -UV (ultraviolet) cut layer- The ultraviolet (UV) cut layer is a layer that has the function of blocking at least a portion of ultraviolet light, for example, at least a portion of light with a wavelength of 300 nm to 380 nm. By having such a layer, discoloration of shoes caused by ultraviolet irradiation can be suppressed.

[0084] The UV-blocking layer can be, for example, a layer in which a material that absorbs or blocks ultraviolet rays (hereinafter also referred to as "UV-blocking agent") is dispersed in a resin.

[0085] Examples of UV-blocking agents that can be used include inorganic UV-blocking agents such as zinc oxide, titanium dioxide, cerium oxide, and iron oxide, as well as organic UV-blocking agents such as benzotriazole and benzophenone. Furthermore, examples of resins included in the UV-cutting layer include polyurethane resin, vinyl chloride-vinyl acetate copolymer, cellulose resin, vinyl chloride-acrylic copolymer resin, ethylene-vinyl acetate copolymer resin, vinyl acetate resin, acrylic resin, polyester resin, alkyd resin, polyvinyl chloride resin, rosin resin, rosin-modified maleic acid resin, terpene resin, phenol-modified terpene resin, ketone resin, cycloadhesive rubber, chlorinated rubber, butyral, polyacetal resin, petroleum resin, and modified resins thereof. These resins can be used individually or in mixtures of two or more.

[0086] The UV-blocking layer can be formed, for example, by applying an ink in which a material that absorbs or blocks the above-mentioned ultraviolet rays is dispersed in a resin to the base layer 2 (first base layer 2a or second base layer 2b).

[0087] The average thickness of the UV-blocking layer is not particularly limited, but for example, it can be between 0.1 μm and 6 μm. The average thickness of the UV-blocking layer is a value measured by cross-sectional analysis using a scanning electron microscope (SEM).

[0088] -Barrier Coat Layer- The barrier coating layer has at least gas barrier properties or moisture resistance. By providing the barrier coating layer, the gas barrier properties and / or moisture resistance of the packaging film 1 can be improved.

[0089] The barrier coat layer is not limited to, but preferably consists of at least one of polyvinylidene chloride, an aluminum oxide vapor-deposited layer, or a silica vapor-deposited layer.

[0090] The barrier coating layer can be formed, for example, by applying a component that forms the barrier coating layer, such as polyvinylidene chloride, to the base layer 2 (first base layer 2a and / or second base layer 2b).

[0091] The average thickness of the barrier coating layer is not particularly limited, but for example, it can be between 10 nm and 30 μm. The average thickness of the barrier coating layer is a value measured by cross-sectional analysis using a scanning electron microscope (SEM).

[0092] [Adhesive layer] An adhesive layer may be provided between the first base layer 2a and the second base layer 2b, if necessary, for bonding the first base layer 2a and the second base layer 2b together. The adhesive forming the adhesive layer is not particularly limited as long as it is transparent and can bond the first base layer 2a and the second base layer 2b together, but examples include polyether urethane and polyester urethane. Furthermore, if a functional layer 2c is provided between the first base layer 2a and the second base layer 2b, the functional layer 2c can be formed by first forming the functional layer 2c on the first base layer 2a and / or the second base layer 2b, then applying an adhesive to the first base layer 2a and / or the second base layer 2b, and joining the two layers together. Furthermore, the adhesive layer is not limited to being provided between the first base layer 2a and the second base layer 2b, but may be provided between any two layers as needed.

[0093] The average thickness of the adhesive layer is not particularly limited, but for example, it can be between 1 μm and 6 μm. The average thickness of the adhesive layer is a value measured by cross-sectional analysis using a scanning electron microscope (SEM).

[0094] (others) UV-blocking properties may be imparted to one or more layers selected from the group consisting of the first base layer 2a, the second base layer 2b, the UV-cutting layer, the barrier coat layer, and the adhesive layer. In other words, in the packaging film 1 of this disclosure, it is preferable that one or more layers selected from the group consisting of the first base layer 2a, the second base layer 2b, the barrier coat layer, and the adhesive layer have UV-blocking properties. By having these layers have UV-blocking properties, the UV-blocking properties of the packaging film 1 as a whole can be further improved. Furthermore, if an adhesive layer is not provided, it is preferable that one or more layers selected from the group consisting of the first base layer 2a, the second base layer 2b, and the barrier coat layer have UV-blocking properties.

[0095] One method for imparting UV-blocking properties to layers such as the first substrate layer 2a and the second substrate layer 2b is to use UV-blocking ink.

[0096] Furthermore, the surface of each layer may be subjected to any surface treatment. Examples of such surface treatments include corona treatment, ozone treatment, and flame treatment.

[0097] (Humidity indicator layer) The packaging film 1 of this disclosure includes a humidity indicator layer 3. When the humidity indicator layer 3 absorbs a certain amount of water vapor, its state changes. By visually detecting the change in the state of the humidity indicator layer 3, it is possible to determine when the packaging film 1 needs to be replaced. In this disclosure, "change in state" refers to, for example, a change in color tone or a change in hue.

[0098] The humidity indicator layer 3 is preferably composed such that its color (e.g., hue) changes between a state in which it does not absorb water vapor and a state in which it absorbs a certain amount of water vapor. The humidity indicator layer 3 can be formed from a composition including, for example, cobalt chloride, an organic dye, a binder resin, and a nonwoven fabric with good moisture absorption.

[0099] Examples of organic dyes include methyl violet, brilliant green, food green No. 3, food blue No. 3, and humidifier B.

[0100] Examples of binder resins include polyvinyl alcohol, polyurethane, acrylic resin, polystyrene sulfonic acid, and polyallylamine.

[0101] Examples of non-woven fabrics with good moisture absorption include polypropylene, polyethylene, and polyester.

[0102] The proportions of each material in the composition forming the humidity indicator layer 3 can be appropriately set to adjust the intensity of the color or the amount of absorbed water vapor that causes a color change.

[0103] The humidity indicator layer 3 does not need to be provided on the entire packaging film 1, but may be formed only on a part of the packaging film 1. When the humidity indicator layer 3 is provided on a part of the packaging film 1, it can be provided on, for example, the part corresponding to the opening of the shoe, the part corresponding to the bottom of the shoe, the part corresponding to the heel of the shoe, the part corresponding to the side of the shoe, etc. Furthermore, the humidity indicator layer 3 may be formed by attaching it to at least one surface of the packaging film 1, or it may be formed by laminating it as part of the layer structure of the packaging film 1. From the viewpoint of design freedom for the packaging film 1, it is preferable that the humidity indicator layer 3 is formed by attaching it to the packaging film 1. On the other hand, from the viewpoint of aesthetics for the packaging film 1, it is preferable that the humidity indicator layer 3 is formed by laminating it as part of the layer structure of the packaging film 1. When the humidity indicator layer 3 is formed by attaching it to the packaging film 1, if the packaging film 1 has a back surface, it is preferable to attach the humidity indicator layer 3 from the back surface. Furthermore, the humidity indicator layer 3 may have a pattern shape that displays characters or images when viewed from above.

[0104] The humidity indicator layer 3 can be formed, for example, by applying the above-described composition to the substrate layer 2. However, it is not limited to this, and the humidity indicator layer 3 may also be formed by pre-forming the above-described composition into a sheet or the like, and then adhering the formed composition to the substrate layer 2.

[0105] Examples of the discoloration patterns (changes in color tone or hue) of the humidity indicator layer 3 include, but are not limited to, a discoloration pattern in which the color changes from colorless to colored, or a discoloration pattern in which the first color changes to a second color.

[0106] The average thickness of the humidity indicator layer 3 is not particularly limited, but can be 100 μm or more and 5000 μm or less, preferably 100 μm or more and 500 μm or less. The average thickness of the humidity indicator layer 3 is a value measured by cross-sectional analysis using a scanning electron microscope (SEM).

[0107] (Physical properties of packaging film, etc.) -Packaging film thickness- The packaging film 1 of this disclosure preferably has a thickness of 10 μm or more and 120 μm or less. Having a certain thickness makes it less prone to wrinkles, resulting in a packaging film 1 with a superior appearance. Furthermore, for transparency, the thickness of the packaging film 1 is more preferably 10 μm or more and 90 μm or less. The thickness of the packaging film 1 can be measured with a film thickness gauge.

[0108] -Water vapor transmission- The packaging film 1 of this disclosure has a water vapor transmission rate of 20 g / m² under conditions of 40°C and 90% RH. 2 It is preferable that the water vapor permeability of the packaging film 1 is less than or equal to the above upper limit. From the viewpoint of moisture resistance, the water vapor permeability of packaging film 1 should be as low as possible, and is preferably 10 g / m² under conditions of 40°C and 90% RH. 2 It is more preferable that it be less than 5 g / m². 2 It is even more preferable that it be less than or equal to one day. The water vapor transmission rate of packaging film 1 is measured using the isobaric method with a PARMATRAN3 / 33 (Mokon Corporation: water vapor transmission rate measuring device) under conditions of 40°C and 90% RH. Furthermore, the water vapor transmission rate of the packaging film 1 can be reduced to below the above upper limit by, for example, adjusting the material used in the base layer 2 or by providing a barrier coat layer.

[0109] -UV transmittance- The packaging film 1 of this disclosure preferably has an ultraviolet transmittance of 15% or less at a wavelength of 360 nm or less. By having an ultraviolet transmittance of packaging film 1 below the above upper limit, discoloration of shoes due to ultraviolet light can be suppressed. From a similar viewpoint, the ultraviolet transmittance of packaging film 1 is more preferably 5% or less, and even more preferably 1% or less. In one embodiment, the ultraviolet transmittance may be 30% or more, depending on the balance with other transparency, etc. UV transmittance (%) = Average transmittance of ultraviolet light with a wavelength of 300-360 nm Ultraviolet transmittance is measured using a UV-Vis-Near-Infrared Spectrophotometer (SIMADZU, UV-3600). The ultraviolet transmittance can be reduced to or below the above upper limit by providing an ultraviolet-cutting layer or by giving ultraviolet-cutting properties to the layer provided in the packaging film 1.

[0110] -Hayes- From the viewpoint of transparency, the packaging film 1 of this disclosure preferably has a haze of 40% or less. When the haze of the packaging film 1 is below the above upper limit, it becomes a packaging film with excellent transparency and appearance. From the same viewpoint, it is more preferable that the haze of the packaging film 1 be 10% or less. However, depending on the balance with other physical properties, the haze may be 5% or more. The haze of packaging film 1 is a value measured using a haze meter in accordance with JIS K7105.

[0111] -Oxygen permeability- The packaging film 1 of this disclosure has an oxygen permeability of 200 cc / m² under conditions of 23°C and 0% RH. 2 It is preferable that the water vapor permeability of the packaging film 1 is less than or equal to the above upper limit. By having a water vapor permeability of the packaging film 1 that is less than or equal to the above upper limit, the packaging film 1 becomes excellent in preventing mold growth and suppressing discoloration of sneakers due to oxidation. The water vapor permeability of packaging film 1 is preferably as low as possible from the viewpoint of preventing mold growth and suppressing discoloration of sneakers due to oxidation, and is 100 cc / m² under conditions of 23°C and 0% RH. 2 It is more preferable that it be less than 50cc / m2 It is even more preferable that it be less than or equal to one day. The oxygen permeability of packaging film 1 is measured using an OX-TRAN2 / 22 (Mokon Co., Ltd.: oxygen permeability measuring device) in accordance with JIS-K7126 (isobaric method) under an atmosphere of 23°C and 0% RH. Furthermore, the oxygen permeability of the packaging film 1 can be kept below the above upper limit by, for example, adjusting the material used in the base layer 2 or by providing a barrier coat layer.

[0112] (Packaging film) In the packaging film 1 of this disclosure, a humidity indicator layer 3 is laminated on one side of the base layer 2, and the film covers the shoe so that the side with the laminated humidity indicator layer 3 can come into contact with the shoe. That is, the humidity indicator layer 3 is provided on the inner surface of the packaging film 1 that faces the shoe. By providing the humidity indicator layer 3 on the inner surface of the packaging film 1 in this way, the amount of water vapor inside the packaging film 1 can be visualized, and the time for replacement can be confirmed.

[0113] In the packaging film 1, the humidity indicator layer 3 may be provided on the entire surface of the packaging film 1, or on a portion of the surface of the packaging film 1. When the humidity indicator layer 3 is provided on a portion of the surface of the packaging film 1, for example, the humidity indicator layer 3 may be provided on the inner surface of the packaging film 1 facing the opening of the shoe, the inner surface of the packaging film 1 facing the side of the shoe, the inner surface of the packaging film 1 facing the portion adjacent to the bottom on the back of the shoe where the heel is located, and the inner surface of the packaging film 1 facing the bottom of the shoe.

[0114] (Method for manufacturing packaging film) The packaging film 1 of this disclosure can be manufactured by applying a composition for forming the humidity indicator layer 3 to a base layer 2, drying it to form a laminated sheet, and then molding and bonding it into a predetermined shape (for example, the shape of a shoe). Alternatively, instead of applying the composition for forming the humidity indicator layer 3, the composition for forming the humidity indicator layer 3 may be formed in advance in sheet form and then attached to the packaging film. Furthermore, if the base material layer 2 consists of two or more layers, it can be manufactured by lamination using an adhesive.

[0115] The following sections will primarily describe the effects of the invention and its variations.

[0116] According to the packaging film 1 of the above embodiment, it is possible to determine when the packaging film 1 should be replaced. The packaging film 1 is placed in a bag made up of film parts 10 and has a humidity indicator part 40 that changes its state according to the humidity history inside the bag. As a result, the packaging film 1 can easily inform the user of when it should be replaced by, for example, letting them perceive a change in the state of the humidity indicator part 40. For example, the packaging film 1 can easily inform the user of when it should be replaced by visually conveying a change in the color tone or hue of the humidity indicator part 40.

[0117] In addition, the packaging film 1 improves the airtightness inside the bag and thus enhances its shelf life by sealing the opening 20 with the sealing portion 30. The packaging film 1 also improves the appearance of the shoes packaged with it, for example, because the film portion 10 is entirely transparent. Therefore, the packaging film 1 can achieve both a good appearance and good shelf life for the packaged shoes. Furthermore, unlike heat-shrinkable packaging materials, the packaging film 1 is reusable and does not require any special techniques such as heat shrinking for packaging. The packaging film 1 allows users to easily package shoes for display without spending time or effort.

[0118] The opening 20 and the sealing portion 30 are positioned at the bottom or top of the bag, which is made up of the film portion 10. This allows the packaging film 1 to position the sealing portion 30 in a location that is difficult for the user to see, thereby improving the appearance of the packaged shoes. For example, when the opening 20 and the sealing portion 30 are positioned at the top of the bag, the packaging film 1 can also house the sealing portion 30 inside the opening of the shoe, making it difficult to see the sealing portion 30 from the outside of the shoe opening.

[0119] The opening 20 and the sealing portion 30 are located at the heel of the bag, which is made up of the film portion 10. This allows the packaging film 1 to facilitate the user's insertion of shoes into the bag. The packaging film 1 improves the ease of inserting shoes into the bag, thereby improving user convenience. Users can easily package shoes for display without spending much time or effort.

[0120] The sealing section 30 includes a fastener. This allows the user to easily seal the inside of the bag with the packaging film 1. The packaging film 1 can also improve user convenience while improving the airtightness inside the bag. Users can easily package display shoes without spending much time or effort.

[0121] The sealing portion 30 includes a lid having a first member 31 and a second member 32 that screw together to sandwich the film portion 10 and close the opening 20. This makes it easier for the user to seal the inside of the bag with the packaging film 1. The packaging film 1 can also improve user convenience while improving the airtightness inside the bag. Users can easily package shoes for display without spending much time or effort.

[0122] The sealing portion 30 closes the opening 20 inside the shoe opening. This allows the packaging film 1 to position the sealing portion 30 in a location that is difficult for the user to see, thereby improving the appearance of the packaged shoes. For example, the packaging film 1 can also house the sealing portion 30 inside the shoe opening, making it difficult to see the sealing portion 30 from the outside of the shoe opening.

[0123] The humidity indicator section 40 is positioned on the inner surface of the bag facing the surface of the shoe. This allows the packaging film 1 to position the humidity indicator section 40 in a location easily visible to the user storing the shoes packaged in the packaging film 1. The user can easily see the humidity indicator section 40 even when, for example, the shoes are packaged in the packaging film 1 and stored for display.

[0124] The humidity indicator section 40 is positioned on the inner surface of the bag facing the opening of the shoe. This allows the packaging film 1 to position the humidity indicator section 40 in a location that is easily visible to the user storing the shoes wrapped in the packaging film 1, but is not particularly conspicuous. Therefore, the packaging film 1 can maintain the appearance of the wrapped shoes. The user can easily check the humidity indicator section 40 even when, for example, the shoes are wrapped in the packaging film 1 and stored for display. The user can also appreciate the shoes wrapped in the packaging film 1 in an aesthetically pleasing manner.

[0125] The humidity indicator section 40 is positioned on the inner surface of the bag facing the opening of the shoe, as shown in Figure 1, for example. In this case, the sealing section 30, including the zipper, is positioned at the top of the bag, close to the opening of the shoe. Therefore, the packaging film 1 can position the humidity indicator section 40 around the sealing section 30. The packaging film 1 can also position the humidity indicator section 40 around the opening 20, which is the most permeable point for water vapor to pass through the inside of the bag made of film, to inform the user early when it is time to replace the packaging film 1.

[0126] The surface of the shoe includes the portion adjacent to the sole on the side or back of the shoe. This allows the packaging film 1 to position the humidity indicator 40 in a location easily visible to the user storing the shoes packaged in the packaging film 1. The user can, for example, check the humidity indicator 40 in a location that they frequently view when admiring the shoes packaged in the packaging film 1. Therefore, the user can also quickly determine when it is time to replace the packaging film 1.

[0127] The packaging film 1 further includes a folding portion 50 that transitions the bag, composed of the film portion 10, between a first state in which the bag is folded and a second state in which the bag has a three-dimensional shape. This allows the packaging film 1 to reduce wrinkles in the bag by positioning the portion that forms a surface in the second state within the bag. The packaging film 1 can improve the appearance of the shoes packaged with the packaging film 1 while maintaining the three-dimensional shape of the bag in the second state.

[0128] The folded portion 50 is positioned at the bottom or heel of the bag, which is made up of the film portion 10. This allows the packaging film 1 to reduce wrinkles in the bag by positioning the portion that forms a surface in the second state at the bottom or heel of the bag. The packaging film 1 can improve the appearance of the shoes packaged with the packaging film 1 while maintaining the three-dimensional shape of the bag in the second state. For example, by positioning the folded portion 50 at the bottom of the bag, the packaging film 1 can reduce the influence of the folded portion 50 on the appearance of the shoes packaged with the packaging film 1. In other words, by positioning the folded portion 50 at the bottom of the bag, the packaging film 1 can also hide the folded portion 50, making it less visible when viewing the shoes packaged with the packaging film 1.

[0129] The folded portion 50 is positioned at the top of the bag formed by the film portion 10. This allows the packaging film 1 to maintain the three-dimensional shape of the bag in the second state while ensuring that no weld lines are placed on the toe area of ​​the shoe, such as the bump or the front of the instep. Therefore, the packaging film 1 can improve the appearance of the shoe packaged with the packaging film 1 while maintaining the three-dimensional shape of the bag in the second state.

[0130] The folded portion 50 is positioned at a different location from the opening 20 and the sealing portion 30. As a result, in a bag composed of the film portion 10, the packaging film 1 allows for the formation of the opening 20 and the sealing portion 30 at a different location from the formation of the folded portion 50, making it easy to form each component into the bag.

[0131] The film portion 10 has a layered structure including at least one of an ultraviolet-cutting layer and a barrier coating layer. Because the film portion 10 has an ultraviolet-cutting layer, the packaging film 1 can suppress discoloration of shoes packaged with the packaging film 1 due to ultraviolet rays. Because the film portion 10 has a barrier coating layer, the packaging film 1 can improve the gas barrier and moisture resistance inside the bag formed by the film portion 10. Therefore, the packaging film 1 can suppress hydrolysis or mold growth of the urethane used in the sole of the shoes due to moisture. The packaging film 1 can improve the shelf life of shoes.

[0132] In the film portion 10, the barrier coating layer has ultraviolet-blocking properties. As a result, the packaging film 1 can suppress discoloration of shoes packaged with the packaging film 1 due to ultraviolet rays, while also improving the gas barrier properties and moisture resistance inside the bag formed by the film portion 10.

[0133] It will be apparent to those skilled in the art that this disclosure can be implemented in other predetermined forms besides the embodiments described above without deviating from its spirit or essential features. Therefore, the prior description is illustrative and not limiting. The scope of the disclosure is defined not by the prior description but by the added claims. Any modifications within their equivalent scope are included therein.

[0134] For example, the shape, pattern, size, arrangement, orientation, type, and number of each component described above are not limited to those shown in the above description and drawings. The shape, pattern, size, arrangement, orientation, type, and number of each component may be arbitrarily configured as long as they can achieve their function. Each component of the illustrated packaging film 1 is a functional concept, and the specific form of each component is not limited to those shown.

[0135] In the above embodiment, the packaging film 1 is described as being placed in a bag made up of film portions 10 and having a humidity indicator portion 40 that changes its state according to the humidity history inside the bag, but it is not limited to this. The packaging film 1 does not have to have a humidity indicator portion 40.

[0136] In the above embodiment, the opening 20 and the sealing portion 30 were described as being located at the heel, bottom, or top of the bag made up of the film portion 10, but are not limited to these locations. The opening 20 and the sealing portion 30 may be located at any other part of the bag made up of the film portion 10.

[0137] In the above embodiment, the sealing portion 30 was described as including a fastener, but is not limited thereto. The sealing portion 30 may include any other configuration that is capable of closing the opening 20 and sealing the inside of the bag.

[0138] In the above embodiment, the sealing portion 30 was described as including a lid having a first member 31 and a second member 32 that screw together to sandwich the film portion 10 and close the opening 20, but it is not limited to this. The sealing portion 30 may include any other configuration that can close the opening 20 and seal the inside of the bag.

[0139] In the above embodiment, the sealing portion 30 was described as closing the opening 20 inside the shoe opening, but it is not limited to this. The sealing portion 30 may also close the opening 20 outside the shoe opening.

[0140] In the above embodiment, the humidity indicator unit 40 was described as being located on the inner surface of the bag facing the surface of the shoe or on the inner surface of the bag facing the opening of the shoe, but it is not limited to this. The humidity indicator unit 40 may be located on any other part of the bag made up of the film unit 10. For example, the humidity indicator unit 40 does not have to be located on the inner surface of the bag, as long as it is possible to change its state according to the humidity history inside the bag made up of the film unit 10.

[0141] In the embodiments described above, the surface of the shoe includes, but is not limited to, portions of the side or back of the shoe adjacent to the bottom. The surface of the shoe may include any other surface of the shoe.

[0142] In the above embodiment, the state of the humidity indicator unit 40 was described as including, for example, color tone or hue, but is not limited thereto. The state of the humidity indicator unit 40 may include, for example, a state that affects the sense of smell, such as odor, or a state that affects the sense of hearing, such as sound, in addition to, a state that affects the sense of sight, such as color tone or hue.

[0143] In the above embodiment, the packaging film 1 is described as further having a folded portion 50 that transitions between a first state in which the bag, composed of the film portion 10, is folded and a second state in which the bag has a three-dimensional shape, but it is not limited to this. The packaging film 1 does not have to have a folded portion 50.

[0144] In the above embodiment, the folded portion 50 was described as being located at the top, bottom, or heel of the bag made up of the film portion 10, but it is not limited to this. The folded portion 50 may be located at any other part of the bag made up of the film portion 10.

[0145] In the above embodiment, the folded portion 50 was described as being located at a different position from the opening 20 and the sealing portion 30, but this is not limited to this. The folded portion 50 may be located at the same position as the opening 20 and the sealing portion 30.

[0146] In the above embodiment, the film portion 10 was described as having a layer structure including at least one of an ultraviolet-cutting layer and a barrier coating layer, but it is not limited to this. The film portion 10 may have a layer structure that does not include either an ultraviolet-cutting layer or a barrier coating layer, or it may not have a layer structure at all.

[0147] In the above embodiment, the barrier coating layer was described as having UV-blocking properties, but this is not the case. The barrier coating layer does not need to have UV-blocking properties.

[0148] In addition to the configuration described in the above embodiment, the packaging film 1 may further have a support, such as a flat underlay, placed at the bottom of the bag formed by the film portion 10. The support of the packaging film 1 is positioned opposite the bottom of the shoe enclosed in the packaging film 1. The support and the film portion 10 may be arranged integrally with each other, or they may be arranged as separate components. By having the support, the packaging film 1 can stably hold the shoe enclosed in the packaging film 1.

[0149] In addition to the configuration described in the above embodiment, the packaging film 1 may further include wires arranged to conform to the shape of the shoe inside the bag formed by the film portion 10. This makes it easier for the packaging film 1 to conform the shape of the bag formed by the film portion 10 to various shoe shapes. The packaging film 1 is not limited to application to shoes with a specific shape, but can be applied to various shoes with any shape. The packaging film 1 can better conform to the shape of the shoe being packaged, improving the appearance of the shoe in its packaged state.

[0150] Figure 14 is a first schematic diagram showing an example of the configuration of the packaging film 1 according to the first modified example of the present disclosure. Figure 15 is a second schematic diagram showing an example of the configuration of the packaging film 1 according to the first modified example of the present disclosure. In the above embodiment, the film portion 10 is configured as a single component bag that conforms to the shape of the shoe S and covers the shoe S, but is not limited thereto. The film portion 10 may be divided into a plurality of components. For example, the film portion 10 may be divided into a first component 11, a second component 12, and a third component 13.

[0151] The first member 11 may, for example, constitute the toe, opening, and side portions of the shoe S in the bag. The second member 12 may, for example, constitute the bottom portion of the shoe S in the bag. The third member 13 may, for example, constitute the heel portion of the shoe S in the bag. The third member 13 may also function as a sealing portion 30 when the film portion 10 conforms to the shape of the shoe S and is configured as a bag that covers the shoe.

[0152] The film portion 10 may be formed by bonding a first member 11, a second member 12, and a third member 13 together to form a bag that covers the shoe S. When the film portion 10 is formed to cover the shoe by conforming to the shape of the shoe S, the first member 11 may be located, for example, in the part of the bag corresponding to the toe, opening, and side of the shoe S. The second member 12 may be located, for example, in the part of the bag corresponding to the bottom of the shoe S. The third member 13 may be located, for example, in the part of the bag corresponding to the heel of the shoe S.

[0153] The third member 13 may also function as a sealing portion 30. For example, the upper half of the third member 13 may function as a sealing portion 30 that closes the opening 20 located at the top of the bag, which is made up of the film portion 10, thereby sealing the inside of the bag. The shoe S may be inserted into the bag from diagonally above the opening 20 located at the top of the bag.

[0154] Figure 16 is a schematic diagram showing an example of the configuration of a packaging film 1 according to a second modification of the present disclosure. In Figure 15, the opening 20 was described as being located at the top of the bag, which is made up of a film portion 10 including three members, but is not limited thereto. As shown in Figure 16, the opening 20 may be located, for example, at the heel of the bag, which is made up of a film portion 10 including three members. The shoe S may be inserted into the bag from the rear through the opening 20 located at the heel of the bag.

[0155] Although the above embodiments primarily describe a packaging film 1 for shoes, the invention is not limited thereto. The packaging film 1 of this disclosure may also be for cards. That is, the collectibles may include cards.

[0156] In this disclosure, “card” includes, for example, collectible cards such as trading cards and postcards. Here, “trading card” refers to a card medium such as paper, resin, or metal, on which various types of images, photographs, documents, etc., such as individually different characters, are printed. The packaging film 1 may be used, for example, by collectors for long-term storage for viewing and preservation, or by retailers for short-term storage for sale. [Examples]

[0157] The contents of this disclosure will be further explained below with reference to examples, but this disclosure is not limited in any way to the examples described below.

[0158] <Preparing the packaging film> The following packaging films were prepared as packaging films. • Packaging film A: Manufactured according to manufacturing example 1 below. • Packaging film B: Manufactured according to manufacturing example 2 below. • Packaging film C: Manufactured according to manufacturing example 3 below. • Packaging film D: Manufactured by KicksWrap, product name "KicksWrap Premium"

[0159] (Manufacturing example 1: Packaging film A) DIC Dry LX-470EL (manufactured by DIC Corporation), SP-60 (manufactured by DIC Corporation), and ethyl acetate were mixed in a weight ratio of 1:1:1. This mixture was then applied to a biaxially oriented polypropylene film (manufactured by Toyobo Co., Ltd., P2161 OPP film) using a laminator, and then laminated to an unoriented polypropylene film (manufactured by Toyobo Co., Ltd., P1128 CPP film). The amount of adhesive solids applied was 3 g / m². 2 The resulting laminate film was stored at 40°C for 72 hours to obtain packaging film A. A humidity indicator (manufactured by Asei Industries, RH70) was attached to the unoriented polypropylene film side of the obtained packaging film A.

[0160] (Manufacturing example 2: Packaging film B) UV-cut ink (DIC Corporation, XS-891) was diluted with a diluent (DIC Corporation, Univia NT Reducer No. 1 K) to a viscosity of 16 seconds (25°C, Zahn Cup No. 3). The diluted UV-cut ink was printed onto a biaxially oriented polypropylene film (Toyobo Co., Ltd., P2161 OPP film, 20 μm thick) using a gravure printing press. The thickness of the UV-cut ink layer was 1 μm. The obtained film was laminated with an unoriented polypropylene film (Toyobo Co., Ltd., P1128 CPP film, 30 μm thick) using the same method as in Production Example 1 to obtain packaging film B.

[0161] (Manufacturing Example 3: Packaging Film C) Packaging film C was obtained in the same manner as in Manufacturing Example 1, except that the biaxially oriented polypropylene film was changed to a biaxially oriented polypropylene film coated with polyvinylidene chloride (manufactured by Daicel Corporation, Kenesi OP 1050, No. 20).

[0162] <Rating> The packaging film was measured using the following method.

[0163] (Water vapor transmission rate) For the above-mentioned packaging films A, B, C, and D, the water vapor transmission rate was measured using the isobaric method with a PARMATRAN3 / 33 (Mokon Corporation: water vapor transmission rate measuring device) under an atmosphere of 40°C and 90% RH. A smaller number indicates better moisture resistance. The results are shown in Table 1.

[0164] (Average thickness) The thicknesses of packaging films A, B, C, and D were measured using a film thickness gauge. The results are shown in Table 1.

[0165] (Oxygen permeability) For the above-mentioned packaging films A, B, C, and D, the oxygen permeability was measured using an OX-TRAN2 / 22 (Mokon Co., Ltd.: oxygen permeability measuring device) in accordance with JIS-K7126 (isobaric method) under an atmosphere of 23°C and 0%RH. The results are shown in Table 1.

[0166] [Table 1]

[0167] Table 1 shows that packaging film A, packaging film B, and packaging film C have low water vapor permeability and excellent moisture resistance.

[0168] (Evaluation of humidity indicator layer) In addition to the above evaluation, we also evaluated the changes in the state of the humidity indicator layer. Specifically, the evaluation was performed using the following procedure. Following the procedure of Manufacturing Example 1, packaging film A' was obtained by forming a humidity indicator layer on packaging film A. Then, film A' was formed into a bag shape with the humidity indicator layer facing inward, and the opening was sealed with a zipper tape (Takiron CI Co., Ltd., MX-13F) heat-sealed at 125°C. This bag was stored in an atmosphere of 40°C and 90% RH, and the humidity indicator layer's color change was observed for evaluation. In this evaluation, the humidity indicator layer of film A', which was light blue, changed to dark blue, allowing for visual indication of when replacement was needed. [Industrial applicability]

[0169] According to this disclosure, it is possible to provide packaging film for collected items that indicates when it is time to replace it. [Explanation of Symbols]

[0170] 1. Packaging film 2 Base material layer 2a 1st base layer 2b Second base layer 2c functional layer 3. Humidity Indicator Layer 10 Film section 11. First Member 12 Second Member 13 Third Member 20 openings 30 Sealing part 31 First Member 32 Second Member 40 Humidity Indicator Section 50 Folded section S shoes

Claims

1. A packaging film for collectibles, A film portion that forms a bag that covers the collected items in accordance with the shape of the collected items, The bag is arranged and has an opening into which the collected material is inserted, A sealing portion that closes the opening and seals the inside of the bag, A humidity indicator unit is placed in the bag and changes its state according to the humidity history inside the bag, Equipped with, Packaging film for collectibles.

2. The packaging film according to claim 1, The opening and the sealing portion are located at the heel, bottom, or top of the bag. Packaging film.

3. The packaging film according to claim 1, The sealing portion includes a fastener, Packaging film.

4. The packaging film according to claim 1, The sealing portion includes a lid having a first member and a second member that screw together to sandwich the film portion and close the opening. Packaging film.

5. A packaging film according to any one of claims 1 to 4, The aforementioned collection includes shoes, The sealing portion closes the opening inside the shoe opening. Packaging film.

6. A packaging film according to any one of claims 1 to 4, The humidity indicator is positioned on the inner surface of the bag facing the surface of the shoe contained in the collected material, or on the inner surface of the bag facing the opening of the shoe. Packaging film.

7. The packaging film according to claim 6, The surface includes a portion adjacent to the bottom on the side or back of the shoe. Packaging film.

8. A packaging film according to any one of claims 1 to 4, The bag further includes a folding section that transitions between a first state in which the bag is folded and a second state in which the bag has a three-dimensional shape. Packaging film.

9. The packaging film according to claim 8, The folded portion is positioned at the top, bottom, or heel of the bag. Packaging film.

10. The packaging film according to claim 8, The folding portion is positioned differently from the opening and the sealing portion. Packaging film.

11. A packaging film according to any one of claims 1 to 4, The film portion has a layered structure including at least one of an ultraviolet-cutting layer and a barrier coating layer. Packaging film.

12. The packaging film according to claim 11, The barrier coating layer has UV-blocking properties. Packaging film.

13. The packaging film according to claim 1, The aforementioned collectibles include cards, Packaging film.

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