Flap label and container with flap label

Abstract

To provide a flap label that can suppress damage to a container to be opened and closed.SOLUTION: There is provided a flap label 10 provided for opening and closing a container 50. The flap label 10 includes a base layer 11 that covers an opening 57 formed in the container 50, and an adhesive layer 15 that makes the base layer 11 releasably adhere to the container 50. A mask layer 17 for partially weakening or eliminating an adhesive force between the container 50 and the adhesive layer 15 is provided on a surface of the adhesive layer 15 so as to face a periphery of the opening 57.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a flap label for opening and closing a container, and to a container with a flap label provided with the flap label. [Background technology]

[0002] In a container for storing an object to be contained, a flap label is used as a lid material that allows the opening of the container to be opened and closed.For example, Patent Document 1 proposes a container opening (packaging container) that includes an opening label (flap label) that allows the opening of the container to be repeatedly opened and closed, the opening label having a gripping part that is the starting point for opening, an unopened indicating part that remains partially on the container when opened to enable determination of whether the container has been opened or not, a cut part that is disposed between the opening part and the unopened indicating part and is inclined with respect to the opening direction, and an adhesion-suppressing layer that suppresses the adhesive force of the gripping part and the cut part (see claims 1, 6, and FIG. 1 of Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2022-121062 A Summary of the Invention [Problem to be solved by the invention]

[0004] When a packaging container is formed from a sheet material including a paper sheet and has a lid on the top surface of the container that is integrated with the top surface by a connecting part before the first opening, the adhesive layer of the flap label adheres to the lid, and when the flap label is pulled up, the lid separates due to the pulling force and adheres to the flap label, and moves (follows) with the flap label to open and close. Also, in order to repeatedly seal the opening with the lid attached to the flap label, it is necessary to adhere the flap label to the periphery of the opening in the container.

[0005] The flap label used in the packaging container of Patent Document 1 has an anti-adhesive layer at the gripping portion, which makes it easy to grip. Also, the anti-adhesive layer is provided at the boundary between the unopened indication portion and other portions, which can prevent the flap label from cracking when opened. However, even if the flap label itself is not damaged when the flap label is opened, there is a risk that the paper sheet around the opening of the container may tear.

[0006] The packaging container of Patent Document 1 also requires a relatively large adhesive force at the first opening in order to separate the lid from the top surface, so when the flap label is pulled up, damage such as tearing of the paper sheet may occur around the opening of the container. Also, in a packaging container made of a sheet material in which a resin film is laminated onto a paper sheet, damage such as lifting of the resin film from the paper sheet and tearing of the paper sheet may occur.

[0007] The present invention has been made in consideration of the above circumstances, and aims to provide a flap label that can prevent damage to the container that is to be opened and closed, and a container with a flap label that is equipped with the same. [Means for solving the problem]

[0008] The characteristic configuration of the flap label according to the present invention to solve the above problems is as follows: A flap label for opening and closing a container, A base layer covering an opening formed in the container; an adhesive layer that releasably adheres the base layer to the container; Equipped with A mask layer that partially weakens or eliminates the adhesive force between the container and the adhesive layer is provided on the surface of the adhesive layer so as to face the periphery of the opening.

[0009] The flap label of this configuration allows the container to be opened and closed by the adhesive layer that can be peeled off from the container. Here, the adhesive force generated when the flap label is lifted up together with the lid of the container easily damages the periphery of the opening of the container. However, a mask layer that partially weakens or eliminates the adhesive force between the container and the adhesive layer is provided on the surface of the adhesive layer so as to face the periphery of the opening, thereby preventing excessive adhesive force from being applied to the periphery of the opening when the flap label is lifted up. Therefore, the flap label can prevent damage to the container that is the object of opening and closing.

[0010] In the flap label according to the present invention, The mask layer preferably has a cutout that partially exposes the adhesive layer underneath to the container side.

[0011] According to the flap label of this configuration, when the mask layer has a cutout, the cutout is a relatively narrow area sandwiched between the mask layers, and in this area, the adhesive function of the adhesive layer can be fully exerted. As a result, when the flap label is pulled up and peeled off from the container, the peeling force can be concentrated on the relatively narrow cutout to form a peeling start point. Then, as the flap label is pulled up, peeling can be progressed sequentially from the peeling start point. Therefore, the flap label becomes easier to peel off, and damage to the container can be further suppressed.

[0012] In the flap label according to the present invention, It is preferable that a gripping portion that is pulled when opening and closing the container is provided integrally with the base layer, and the mask layer is further provided on at least a portion of the surface of the gripping portion.

[0013] According to the flap label of this configuration, the gripping portion is integral with the base layer, and a mask layer is further provided on at least a portion of the surface of the gripping portion, so that the flap label can be easily pulled up via the gripping portion. Therefore, the flap label is more easily peeled off from the container, and damage to the container can be further suppressed.

[0014] In the flap label according to the present invention, The cutout is preferably provided in the vicinity of the gripping portion.

[0015] With the flap label of this configuration, the cutout is located close to the gripping portion, and this combines with the concentration of the peeling force at the notch to form a peeling starting point, and the application of a pulling force by the gripping portion, making the flap label easier to peel off from the container and further reducing damage to the container.

[0016] In the flap label according to the present invention, The mask layer is preferably formed so as to protrude from the gripping portion toward the notch portion.

[0017] With this flap label, the mask layer protrudes from the gripping portion toward the notch, so that the notch has a convex, U-shaped, or V-shaped shape protruding from the gripping portion toward the opening, which allows the peeling force to be more concentrated at the notch. This makes the flap label easier to peel off from the container, and further reduces damage to the container.

[0018] In the flap label according to the present invention, When the base layer is peeled off from the container by pulling the gripping portion, it is preferable that the mask layer is further provided in parallel to the pulling direction of the base layer.

[0019] With this flap label, the mask layer is further provided parallel to the tensile direction of the base layer, which reduces the adhesive strength between the flap label and the container in areas other than the periphery of the container opening. This makes the flap label easier to peel off from the container, and further reduces damage to the container.

[0020] In the flap label according to the present invention, It is preferable that the area ratio [S2 / (S1+S2) × 100] of the area S2 of the mask layer to the sum of the area S1 of the adhesive layer extending outside the opening parallel to the tensile direction of the base material layer and extending to a region including the mask layer that is furthest from each other and the area S2 of the mask layer is 20 to 80%.

[0021] With the flap label of this configuration, by setting the area ratio [S2 / (S1+S2) x 100] within the above range, the adhesive strength can be optimized while maintaining a balance between the adhesive strength and the sealing performance of the flap label and the container. Therefore, the flap label can improve the sealing performance of the container while further suppressing damage to the container.

[0022] In the flap label according to the present invention, The mask layer is preferably formed in a pattern including a half-tone pattern, a stripe pattern, and / or a dot pattern.

[0023] According to the flap label of this configuration, the mask layer is formed with a pattern including a half-tone pattern, a stripe pattern, and / or a dot pattern, so that the adhesive strength of the adhesive layer can be finely set according to the type, arrangement, size, etc. of the pattern, and therefore the adhesive strength can be more appropriately adjusted. Therefore, the flap label can further suppress damage to the container.

[0024] In the flap label according to the present invention, It is preferable that the mask layer is further provided perpendicular to the tensile direction of the base layer.

[0025] With this flap label, the mask layer is further provided perpendicular to the tensile direction of the base layer, which reduces the adhesive strength between the flap label and the container in areas other than the periphery of the container opening. This makes the flap label easier to peel off from the container, and further reduces damage to the container.

[0026] In the flap label according to the present invention, The difference (Fa-F0) between the adhesive strength (F0) when re-opened immediately after the initial opening and closing and the adhesive strength (Fa) when re-opened after storing at room temperature (25°C) for 4 weeks is 2.0 to 8.0 N / 15 mm; The difference (Fb-F0) between the adhesive strength (F0) and the adhesive strength (Fb) when the package is reopened after storage at a low temperature (5°C) for 4 weeks is preferably 1.0 to 7.0 N / 15 mm.

[0027] With the flap label of this configuration, the difference in adhesive strength when re-opened after storage at room temperature (Fa-F0) and the difference in adhesive strength when re-opened after storage at low temperature (Fb-F0) are set within the above ranges, respectively, so that the adhesive strength of the flap label can be made stable over time. Therefore, even if the flap label is repeatedly opened and closed, damage to the container can be suppressed and the sealability can be maintained.

[0028] The characteristic configuration of the flap-labeled container according to the present invention for solving the above problems is as follows: The above-mentioned flap label, a container having an opening that is opened and closed by the flap label; The purpose of this study is to provide

[0029] According to the flap-labeled container of this configuration, by being provided with the above-mentioned flap label, damage to the container that is the object of opening and closing can be suppressed.

[0030] In the container with a flap label according to the present invention, A lid portion is provided to close the opening before opening, The lid portion is integrated with the top surface portion of the container by a connecting portion before the first opening, It is preferable that the flap label is configured so that, when the flap label is first lifted, the lid portion is separated from the top portion following the flap label, thereby forming the opening.

[0031] With a flap-labeled container of this configuration, damage to the container can be suppressed when the lid portion is separated from the top portion with a relatively large pulling force due to the initial lifting (opening) of the flap label.

[0032] In the container with a flap label according to the present invention, The container is preferably made of a sheet including a base layer made of paper.

[0033] When a container is formed from a sheet including a base layer made of paper, the base layer is relatively prone to tearing due to the paper quality of the base layer. However, with the container with flap label of the present configuration, even when such a container is used, the opening of the container is opened and closed by the flap label of the present invention, so tearing of the base layer can be suppressed. [Brief description of the drawings]

[0034] [Figure 1] FIG. 1 is an explanatory diagram of a flap-labeled container according to one embodiment of the present invention, which is provided with a flap label according to one embodiment of the present invention. [Diagram 2] FIG. 2 is an explanatory diagram of the container and the contained items shown in FIG. [Diagram 3] FIG. 3 is an explanatory diagram of the flap label shown in FIG. [Figure 4] FIG. 4 is a cross-sectional view showing a schematic open and closed state of the flap label. [Diagram 5] FIG. 5 shows various modified examples of the flap label. [Figure 6] FIG. 6 shows various modified examples of the flap label. [Figure 7] FIG. 7 is a diagram showing a flap label of a comparative example corresponding to the prior art. [Figure 8] FIG. 8 is a graph showing the change in adhesive strength depending on the storage environment (results of Test Example 4). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0035] Hereinafter, an embodiment of a container with a flap label according to the present invention will be described. However, the present invention is not intended to be limited to the following embodiments, examples, and drawings. The flap label, container, and contents shown in each figure are not strictly described based on their actual structure or shape, and details are omitted. In addition, although Figures 2 and 4 show the layer structure of a container with a flap label, they do not necessarily accurately reflect the actual thickness relationship of each layer. In this specification, the "front surface" of a flap label means the surface exposed to the outside, and the "back surface" means the surface that comes into contact with the container.

[0036] [Overall configuration of container with flap label] Fig. 1 is an explanatory diagram of a flap-labeled container 100 according to one embodiment of the present invention, which is equipped with a flap label 10 according to one embodiment of the present invention. Fig. 1(a) is a diagram showing a state in which the flap label 10 is closed, and Fig. 1(b) is a diagram showing a state in which the flap label 10 is opened.

[0037] As shown in FIG. 1, a container 100 with a flap label includes a container 50 and a flap label 10. An object 70 is contained in the container 50. The flap label 10 is attached to a top surface 51 of the container 50 so as to be openable and closable. The area of ​​the flap label 10 that is attached to the container 50 is formed to be slightly smaller than the top surface 51 of the container 50. When the flap label 10 is pulled up by gripping the gripping portion 13 provided at one end thereof from the state shown in FIG. 1(a), as shown in FIG. 1(b), the flap label 10 is pulled up together with the lid portion 53 of the container 50 while the end opposite the gripping portion 13 remains attached to the top surface 51 of the container 50, and an opening 57 of the container 50 is exposed. Next, from the state shown in Fig. 1(b), when the gripping portion 13 is gripped and the flap label 10 is pulled down together with the lid portion 53, the opening 57 is closed (covered) by the flap label 10 as shown in Fig. 1(a). By being provided with such a flap label 10, the container 100 with a flap label can suppress damage to the container 50 that is the object of opening and closing. Below, the container 50 that is the object of opening and closing the flap label 10, the contained item 70 contained in the container 50, and the flap label 10 will be described.

[0038] <Containers and contents> Fig. 2 is an explanatory diagram of the container 50 and the contained object 70 shown in Fig. 1. Fig. 2(a) is a diagram showing the container 50 together with a cross-sectional view taken along line AA, Fig. 2(b) is a diagram showing an example in which the sheet 60 in Fig. 2(a) is modified to a different form, and Fig. 2(c) is a diagram showing the contained object 70 together with a cross-sectional view taken along line BB.

[0039] (container) 2(a), the container 50 is formed, for example, by assembling punched sheets 60 into a box shape. The shape of the container 50 is not particularly limited, and may be, for example, a rectangular box shape. The container 50 has a lid 53 on a top surface 51.

[0040] The sheet 60 constituting the container 50 is not particularly limited and may be appropriately set. As the sheet 60, for example, a sheet 60a formed by laminating a resin layer 63 on a base material layer 61 as shown in Fig. 2(a) may be used, or a sheet 60b formed by a base material layer 61 as shown in Fig. 2(b) may be used.

[0041] Examples of the base layer 61 include a biaxially oriented polyethylene terephthalate film, a biaxially oriented polypropylene film, a biaxially oriented polyamide film, and paper. The base layer 61 may be vapor-deposited with a metal or a metal oxide. From the viewpoint of environmental protection, the base layer 61 is preferably a paper sheet. The thickness of the base layer 61 is set to, for example, 0.05 to 0.5 mm. As described later, when the contents 73 of the contained item 70 contained in the container 50 are such as seasonings that need to be refrigerated after opening, there is a risk of condensation occurring due to temperature changes between refrigeration and room temperature. In consideration of such a case, it is therefore preferable that the base layer 61 is water-resistant.

[0042] When the container 50 is formed from a sheet 60b made of a paper base layer 61, the base layer 61 is relatively prone to tearing due to the fact that it is made of paper. However, even when such a container 50 is used, the opening 57 of the container 50 is opened and closed by the flap label 10 of the present invention, so tearing of the base layer 61 can be suppressed.

[0043] Examples of resin materials constituting the resin layer 63 include low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-methacrylic acid copolymer, ethylene-acrylic acid copolymer, ethylene-ethyl acrylate copolymer, ethylene-butyl acrylate copolymer, etc. Among these, polypropylene (PP) is preferred. From the viewpoint of reducing the adhesive force between the flap label 10 and the container 50 and making it easier to lift up the flap label 10, the resin layer 63 is preferably made of a polypropylene film with a matte outer surface (matte PP).

[0044] When the container 50 is formed of a sheet 60a in which a paper base layer 61 and a resin layer 63 are laminated, the resin layer 63 is relatively likely to lift off the base layer 61, and is relatively likely to tear because the base layer 61 is made of paper. However, even when such a container 50 is used, the opening 57 of the container 50 is opened and closed by the flap label 10 of the present invention, so that the lifting of the resin layer 63 and the tearing of the base layer 61 can be suppressed. In particular, when a polypropylene film with a matte outer surface is used as the resin layer 63, the lifting of the resin layer 63 and the tearing of the base layer 61 can be further suppressed. The thickness of the resin layer 63 is set to, for example, 15 to 50 μm.

[0045] The container 50 has a lid portion 53 that closes the opening 57 before opening. The lid portion 53 of the container 50 is integrated with the top surface portion 51 by the connecting portion 56 before the first opening. When the flap label 10 is lifted up for the first time (first time), the lid portion 53 follows the flap label 10 and is separated from the top surface portion 51, forming the opening 57. By breaking the connecting portion 56 at the time of opening, damage to the container 50 can be suppressed even if the lid portion 53 is separated from the top surface portion 51 by a relatively large lifting force when the flap label 10 is first lifted (opened). The flap label 10 is adhered to the top surface portion 51 (including the lid portion 53), and by first lifting the flap label 10, the lid portion 53 is lifted up following the flap label 10, and the lifting force breaks the connecting portion 56, whereby the lid portion 53 is separated from the top surface portion 51, forming the opening 57. Thereafter, the lid portion 53, while adhered to the flap label 10, moves in conjunction with the opening and closing operation of the flap label 10. The number and dimensions of the connecting portions 56 are not particularly limited, and can be appropriately set so that the lid portion 53 does not separate between the time the contents 70 are placed in the container 50 and the time the flap label 10 is adhered, and so that the lid portion 53 separates when the flap label 10 is first lifted up.

[0046] 2(a), the connecting parts 56 are provided one near the gripping part 13 of the flap label 10 at the opening 57, one on each side, and two on the side opposite the gripping part 13 (five in total). When the lid part 53 is separated from the top surface part 51, the connecting parts 56 break, thereby preventing damage to the top surface part 51. Alternatively, the connecting parts 56 may be provided one near the gripping part 13 of the flap label 10 at the opening 57, and two on the side opposite the gripping part 13 (three in total).

[0047] The shapes of the opening 57 and the lid portion 53 can be set appropriately depending on the shape of the top surface portion 51, and in the embodiment shown in FIG. 2, they are formed in a rectangular shape with rounded corners.

[0048] A hole 59 through which the contained object 70 can be visually observed from the outside may be formed in the side surface of the container 50 on the gripping portion 13 side.

[0049] (Items contained) The object 70 is contained in the container 50, and may be, for example, an object in which the contents 73 are contained in a packaging body (for example, a resin bag) 71. The contents 73 may be, for example, a solid or semi-solid, such as a seasoning such as miso paste. The packaging bag 71 may be, for example, a soft packaging material formed from a plastic film. The thickness of the packaging body 71 is set to, for example, 30 to 150 μm. A perforation 77 is formed in the top surface 75 of the packaging body 71, for example, by forming through holes intermittently in a circular shape. The perforation 77 is cut in a circular shape to form an opening 79 in the top surface 75. When the lid 53 of the container 50 is opened by the flap label 10, the top surface 75 of the object 70 is exposed, and when the top surface 75 is cut in a circular shape along the perforation 77, the contents 73 in the object 70 can be taken out.

[0050] <Flap label> FIG. 3 is an explanatory diagram of the flap label 10 shown in FIG. 1. FIG. 3(a) is a diagram showing the outer side (front side) of the flap label 10, FIG. 3(b) is a diagram showing the inner side (back side) of the flap label 10, and FIG. 3(c) is a diagram showing an enlarged view of the periphery of the gripping portion in FIG. 3(b). FIG. 4 is a cross-sectional view showing the open and closed states of the flap label 10. FIG. 4(a) is a cross-sectional view showing the closed state of the flap label 10, and FIG. 4(b) is a cross-sectional view showing the open state of the flap label 10. FIG. 5 and FIG. 6 are diagrams showing various modified examples of the flap label 10. FIG. 7 is a diagram showing a comparative example of a flap label corresponding to the prior art.

[0051] As shown in Fig. 3 and Fig. 4, the flap label 10 includes a base layer 11 that covers an opening 57 formed in a container 50, and an adhesive layer 15 that releasably adheres the base layer 11 to the container 50. A mask layer 17 that partially weakens or eliminates the adhesive force between the container 50 and the adhesive layer 15 is provided on the surface of the adhesive layer 15 so as to face the periphery of the opening 57. Here, "partially weakening the adhesive force" means a state in which the adhesive force remains but is reduced to such an extent that the original adhesive function is not exerted. In the embodiment shown in Fig. 3, a mask layer (first mask layer) 17a, a mask layer (second mask layer) 17b, and a mask layer (third mask layer) 17c are provided as the mask layer 17.

[0052] (base material layer) The base layer 11 is the main material of the flap label 10 and provides rigidity and flexibility to the flap label 10. The base layer 11 is formed to a size larger than the opening 57 formed in the container 50 so as to cover the opening 57. Examples of the base layer 11 include resin films, and biaxially oriented films are preferable. Biaxially oriented films are thin and highly flexible, and tend to become flat, so that wrinkles are unlikely to occur when the flap label 10 is opened and closed, and the occurrence of gaps between the flap label 10 and the container 50 can be suppressed. Examples of biaxially oriented films include biaxially oriented polyethylene terephthalate films, biaxially oriented polyamide films, and biaxially oriented polypropylene films. The thickness of the base layer 11 is set to, for example, 20 to 80 μm.

[0053] 3, the flap label 10 has a gripping portion 13 that is pulled when the container 50 is opened or closed, and is provided integrally with the base layer 11. The gripping portion 13 protrudes laterally from the container 50. This makes it easier for the user to grip the gripping portion 13.

[0054] (Adhesive layer) The adhesive layer 15 imparts to the flap label 10 an adhesive force that allows the flap label 10 to releasably adhere to the container 50. The adhesive layer 15 is formed on the entire surface (including the gripping portion 13) of the base layer 11. The adhesive force of the adhesive layer 15 is set to a range in which the lid portion 53 of the container 50 adheres to the adhesive layer 15 and the lid portion 53 is not easily peeled off from the adhesive layer 15 when opening and closing. The adhesive layer 15 may be a layer made of an acrylic adhesive or a film coated with an acrylic adhesive. When the adhesive layer 15 is configured as a layer made of an acrylic adhesive, it can be directly adhered to the base layer 11 due to its adhesiveness, but when a film coated with an acrylic adhesive is used as the adhesive layer 15, the film side of the adhesive layer 15 may be adhered to the base layer 11 using an adhesive or adhesive. When the adhesive layer 15 is a layer made of an acrylic adhesive, its thickness is set to, for example, 10 to 30 μm. When the adhesive layer 15 is a film coated with an acrylic adhesive, the thickness is set to, for example, 10 to 100 μm.

[0055] (Mask layer) The mask layer 17 partially weakens or eliminates the adhesive force between the container 50 and the adhesive layer 15. For example, as shown as [EX-A] in Fig. 3, a mask layer 17a is provided on the surface of the adhesive layer 15 so as to face the periphery of an opening 57 (shown by a dashed line in Fig. 3(b)) (so as to overlap with the periphery of the opening 57 when the flap label 10 is closed).

[0056] As described above, the adhesive layer 15 has an adhesive strength such that the lid portion 53 does not easily peel off. Here, the flap label 10' shown in FIG. 7 as a comparative example [CEX-A] does not have a mask layer 17a facing the peripheral portion of the opening 51. Therefore, the flap label 10' corresponds to the prior art. In such a flap label 10', since the adhesive layer 15 is located at a position facing the peripheral portion of the opening 57, when the flap label 10' is pulled up, an excessive tensile force is applied to the peripheral portion of the opening 57 due to the adhesive strength of the adhesive layer 15, and the flap label 10' may float from the peripheral portion to the top surface portion 51 of the container 50, causing damage such as tearing. In particular, when the flap label 10 is pulled up for the first time, it is necessary to break the connecting portion 56 in order to separate the lid portion 53 from the top surface portion 51 to form the opening 57, so a larger tensile force is applied to the peripheral portion of the opening 57 compared to the case of pulling up the flap label for the second or subsequent times.

[0057] However, in the flap label 10 of this embodiment, the mask layer 17a is provided on the surface of the adhesive layer 15 so as to face the periphery of the opening 57, so that excessive tensile force is not applied when the flap label 10 is pulled up. Therefore, when the flap label 10 is pulled up as shown in Fig. 4(b) from the closed state shown in Fig. 4(a), the opening 57 is exposed without damaging the container 50. On the other hand, when the flap label 10 is closed as shown in Fig. 4(a) from the pulled up state shown in Fig. 4(b), the opening 57 is closed by the lid portion 53.

[0058] Examples of the mask layer 17a include a varnish layer obtained by applying and drying a transparent varnish, a film layer using a film having no adhesive power, etc., and a varnish layer is preferred in that the formation area of ​​the mask layer 17a can be precisely adjusted. As the varnish, a conventionally known varnish as a so-called glue-killing varnish can be used, and examples of the varnish include varnishes containing paraffin wax, silica, polytetrafluoroethylene, a photoinitiator, an additive (silicone), etc. Examples of such varnish include a varnish containing 0.1-10% by mass of paraffin wax, 1-10% by mass of silica, 0.1-5% by mass of polytetrafluoroethylene, 0.1-5% by mass of isobutyl lanolate, 0.1-1% by mass of octamethylcyclotetrasiloxane, 10-20% by mass of prepolymer, 30-60% by mass of hexaacrylate, 1-5% by mass of 2-methyl-4'-methylthio-2-morpholinopropiophene, 1-5% by mass of photoinitiator, 0.1-5% by mass of photoinitiator assistant, and 0.1-10% by mass of additive (silicone) so that the total amount is 100% by mass. The thickness of the mask layer 17a is set to, for example, 1-5 μm.

[0059] The mask layer 17a is formed along the shape of the periphery of the opening 57. In the embodiment shown in FIG. 3(b), the mask layer 17a is shaped to have a cutout 15aa that partially exposes the adhesive layer 15 present thereunder to the container 50 side. The width W0 of the mask layer 17a is preferably 2 to 5 mm. Specifically, as shown in FIGS. 3(b) and 3(c), the width W0a of the portion extending perpendicular to the tensile direction P on the side opposite the gripping portion 13 in the mask layer 17a, the widths W0b and W0c of the two portions extending parallel to the tensile direction P, and the width W0d of the portion extending perpendicular to the tensile direction P on the gripping portion 13 side are all preferably 2 to 5 mm. These widths W0a, W0b, W0c, and W0d can each be set arbitrarily. For example, the widths W0a, W0b, W0c, and W0d can be set to the same value. Also, for example, the widths W0a and W0d may be set to the same value, and the widths W0b and W0c may be set to the same value that is greater than the widths W0a and W0d.

[0060] When the mask layer 17a has the notch 15aa, the notch 15aa is a relatively narrow area sandwiched between the mask layers 17a, and in this area, the adhesive function of the adhesive layer 15 can be fully exerted. As a result, when the flap label 10 is pulled up and peeled off from the container 50, the peeling force can be concentrated at the relatively narrow notch 15aa to form a peeling start point. Then, as the flap label 10 is pulled up, peeling can be progressed sequentially from the peeling start point. Therefore, the flap label 10 becomes easier to peel off, and damage to the container 50 can be further suppressed.

[0061] The notch 15aa is preferably provided in a position close to the gripping portion 13. In this case, the formation of a peeling starting point due to the concentration of the peeling force at the notch 15aa described above, combined with the application of a pulling force by the gripping portion 13 described above, makes the flap label 10 easier to peel from the container 50, and damage to the container 50 can be further suppressed.

[0062] 3(b), a mask layer 17b is further provided on at least a portion of the surface of the gripping portion 13. By providing the gripping portion 13 integrally with the base layer 11 and further providing a mask layer 17b on at least a portion of the surface of the gripping portion 13, the flap label 10 can be easily pulled up via the gripping portion 13. Therefore, the flap label 10 can be more easily peeled off from the container 50, and damage to the container 50 can be further suppressed.

[0063] It is preferable that the mask layer 17b is formed so as to protrude from the gripping portion 13 toward the notch 15aa. In this case, the notch 15aa has a shape (e.g., a convex, U-shape, or V-shape) that protrudes from the gripping portion 13 toward the opening 57, so that the peeling force can be more concentrated at the notch 15aa. Therefore, the flap label 10 can be more easily peeled from the container 50, and damage to the container 50 can be more effectively suppressed.

[0064] Moreover, the mask layer 17b is preferably formed on both outer sides of the gripping portion 13 in parallel with the periphery of the opening 57 and spaced apart from the mask layer 17a. The distance W1 between the mask layer 17b and the mask layer 17a (the shortest distance between them) is preferably 2 to 9 mm. When the mask layer 17b protrudes from the gripping portion 13 toward the notch 15aa, the distance W1 is more preferably 2 to 4 mm. On the other hand, when the mask layer 17b does not protrude as described above and is flat, the distance W1 is more preferably 6 to 9 mm. The distance W2 between the mask layer 17b and the periphery of the opening 57 (the shortest distance between them) is preferably 2 to 9 mm. When the mask layer 17b protrudes from the gripping portion 13 toward the notch 15aa, the distance W2 is the distance between the protruding end of the mask layer 17b and the periphery of the opening 17. In this case, the distance W2 is more preferably 2 to 3 mm. On the other hand, when the mask layer 17b is flat and does not protrude as described above, the distance W2 is the distance between the flat portion of the mask layer 17b and the periphery of the opening 17. In this case, the distance W2 is more preferably 4 to 9 mm. By setting the distances W1 and W2 within the above ranges, the flap label 10 becomes easier to peel off from the container 50. The length W3 in the pulling direction P of the mask layer 17b (the length from the tip of the gripping portion 13 to the tip toward the opening 57) is preferably 6 to 16 mm. The protruding length W4 of the gripping portion 13 is preferably 6 to 12 mm.

[0065] 3, when the gripping portion 13 is pulled to peel the base layer 11 from the container 50, a mask layer (third mask layer) 17c is further provided parallel to the pulling direction P of the base layer 11. In this case, the adhesive force between the flap label 10 and the container 50 can be reduced in areas other than the periphery of the opening 57 of the container 50. Therefore, the flap label 10 can be more easily peeled off from the container 50, and damage to the container 50 can be further suppressed.

[0066] The area ratio [S2 / (S1+S2)×100] of the area S2 of the mask layer 17c to the sum of the area S1 of the adhesive layer 15 that extends in parallel with the tensile direction P of the base layer 11 outside the opening 57 and extends in the region R including the mask layer 17c that is farthest from each other and the area S2 of the mask layer 17c is preferably 20 to 80%. Here, the area S1 of the adhesive layer 15 is the area of ​​the part that is not covered (exposed) by the mask layer 17c. Therefore, the sum (S1+S2) of the area S1 and the area S2 corresponds to the sum of the area of ​​the part of the adhesive layer 15 that is not covered by the mask layer 17c and the area of ​​the part that is covered by the mask layer 17c. By setting the area ratio [S2 / (S1+S2)×100] in the above range, the adhesive strength of the flap label 10 and the container 50 can be optimized while maintaining a balance between the adhesive strength and the sealing property. Therefore, the flap label 10 can improve the sealing performance of the container 50 while further suppressing damage to the container 50. The width W5 of the mask layer 17c in the direction perpendicular to the tensile direction P is preferably 5 to 9 mm.

[0067] The mask layer 17c is preferably formed in a pattern including a half-tone pattern, a stripe pattern, and / or a dot pattern. In this case, the adhesive strength of the adhesive layer 15 can be finely set depending on the type, arrangement, size, etc. of the pattern, so that it is possible to further prevent excessive adhesive strength from being applied. Therefore, the flap label 10 can further prevent damage to the container 50. In the embodiment shown in FIG. 3(b), the mask layer 17c is formed in a pattern including a dot pattern.

[0068] (Stopper part) 3, a stopper portion 21 is provided to prevent the flap label 10 from opening too much and becoming detached from the container 50 when the flap label 10 is pulled up. The installation locations, number, and dimensions of the stopper portions 21 can be set appropriately.

[0069] (Tamper-proof section) In the embodiment shown in FIG. 3, the flap label 10 is provided with a tamper evident portion 23 for preventing tampering. The tamper evident portion 23 is provided at both ends of the flap label 10 on the grip portion 13 side, inclined with respect to the opening and closing direction (the same direction as the pulling direction P). The tamper evident portion 23 is formed by a cut having a step. No mask layer is provided on the tamper evident portion 23. Therefore, when the flap label 10 is initially pulled up, the tamper evident portion 23 remains on the top surface portion 51 of the container 50, indicating that it has already been opened. The number of cuts and the interval between the steps can be set as appropriate.

[0070] (Flap label performance) The performance of the flap label 10 can be evaluated by its adhesive strength. Here, F0 is the adhesive strength when the container is re-opened immediately after first opening and closing, Fa is the adhesive strength when the container is re-opened after four weeks of storage at room temperature (25°C), and Fb is the adhesive strength when the container is re-opened after four weeks of storage at low temperature (5°C). It is preferable that Fa-F0 is 2.0 to 8.0 N / 15 mm, and Fb-F0 is 1.0 to 7.0 N / 15 mm. The adhesive strength is measured as follows. That is, the flap label 10 is attached to the top surface 51 of the container 50, and a weight is used to apply a pressure of 315.6 Pa (31.2 kgf / m 2 ) for 30 seconds, and then left to stand under each of the above temperature environments for storage. After 4 weeks, the bonded portion is cut to a width of 15 mm and a length of 80 mm or more to obtain a test piece. The flap label 10 is partially peeled from one end of the test piece so as to form a gripping margin, and the peeled flap label 10 and the top surface 51 of the container 50 are set in the chuck of a tensile tester. Next, the flap label 10 is pulled at a speed of 300 mm / min, and the stress (adhesive strength) is measured while peeling until the flap label 10 is completely peeled off, and a curve showing the relationship between the peel length and the adhesive strength is obtained. Then, in the curve, the average value of the adhesive strength every 5 mm from the start of peeling (start of pulling) to the point where it has been peeled 20 mm to the point where it has been peeled 50 mm is obtained as the adhesive strength (N / 15 mm).

[0071] By setting the difference in adhesive strength when re-opened after storage at room temperature (Fa-F0) and the difference in adhesive strength when re-opened after storage at low temperature (Fb-F0) within the above ranges, respectively, it is possible to stabilize the adhesive strength of the flap label 10 over time. Therefore, the flap label 10 can suppress damage to the container 50 even when it is repeatedly opened and closed, and can also maintain its airtightness.

[0072] (Variation of flap label) The flap label 10 is not limited to the embodiment [EX-A] shown in FIG. 3(b), and various embodiments can be adopted.

[0073] In the embodiment shown in [EX-B] of FIG. 5, the mask layer 17b is formed in a pattern including a striped design.

[0074] In the embodiment shown in [EX-C] of FIG. 5, a mask layer (fourth mask layer) 17d is further provided perpendicular to the tensile direction P of the base layer 11 on the side opposite to the gripping portion 13. The mask layer 17d can be formed with a pattern including a dot pattern, a half-tone pattern, and / or a stripe pattern, as well as a dot pattern, as with the mask layer 17c. By further providing the mask layer 17d perpendicular to the tensile direction P of the base layer 11, the adhesive force between the flap label 10 and the container 50 can be reduced in areas other than the periphery of the opening 57 of the container 50. Therefore, the flap label 10 can be more easily peeled off from the container 50, and damage to the container 50 can be more effectively suppressed.

[0075] In the embodiments shown in [EX-D] to [EX-G] of FIG. 5, the mask layer 17a and the mask layer 17b are provided, but the mask layer 17c is not provided. In [EX-D], the mask layer 17b is formed only in the region of the grip portion 13, and does not have both outer extensions and protrusions. In the embodiment shown in [EX-E], the mask layer 17b is not formed on the entire grip portion 13. The mask layer 17b is formed on the entire tip side of the grip portion 13, and the mask layer 17b is not formed on the base end side of the grip portion 13, and no protrusions are provided. In the embodiment shown in [EX-F], the cutout portion 15aa is formed over the entire side facing the grip portion 13 in the peripheral portion of the opening 57. The mask layer 17b is formed in the same manner as in [EX-D] described above. In the embodiment shown in [EX-G], the mask layer 17a is formed over the entire peripheral portion (whole circumference) of the opening 57. The mask layer 17b is formed in the same manner as in [EX-D] described above.

[0076] In the embodiment shown in [EX-H] of Fig. 6, mask layer 17b is not formed on either outer side of gripping portion 13, and is formed so as to protrude from the tip side of gripping portion 13 into gripping portion 13. In the embodiment shown in [EX-I] of Fig. 6, mask layer 17b has extending portions extending from gripping portion 13 to either outer side, but no protruding portions are formed.

[0077] In the embodiments shown in [EX-J] to [EX-L] of FIG. 6, a mask layer (fifth mask layer) 17e is formed as the mask layer 17 in all areas where the mask layers 17a and 17b are not formed. In [EX-J], the mask layer 17e is formed instead of the mask layer 17c in the embodiment shown in [EX-A] described above. In the embodiment shown in [EX-K], the mask layer 17e is formed instead of the mask layer 17c in the embodiment shown in [EX-H] described above. In the embodiment shown in [EX-L], the mask layer 17e is formed instead of the mask layer 17c in the embodiment shown in [EX-I] described above.

[0078] In the embodiment shown in [EX-M] in Fig. 6, the tamper evident portion 23 is formed by perforations. The width (thickness), interval, and number of the perforations are not particularly limited and may be set appropriately.

[0079] The flap label 10 is produced by adhering an adhesive layer 15 to a base layer 11, forming a mask layer 17 on the adhesive layer 15, and forming a stopper portion 21 and a tamper-evident portion 23 by cutting or the like. The container 100 with a flap label is produced by assembling the sheet 60 into a box shape with an item 70 to be contained placed on the sheet 60 to form a container 50, and adhering the flap label 10 to the top surface portion 51 of the container 50. EXAMPLES

[0080] Hereinafter, examples of the configuration of the flap label and the container with the flap label of the present invention will be described in more detail with reference to examples.

[0081] [Test Example 1] The materials used for the flap label were a matte type biaxially stretched polypropylene film (thickness: 25 μm) as the base layer. A film in which an acrylic adhesive was applied to both sides of a white polyethylene terephthalate film (thickness: 50 μm) was used as the adhesive layer. A varnish containing 0.1 to 10 mass% paraffin wax, 1 to 10 mass% silica, 0.1 to 5 mass% polytetrafluoroethylene, 0.1 to 5 mass% isobutyl lanolate, 0.1 to 1 mass% octamethylcyclotetrasiloxane, 10 to 20 mass% prepolymer, 30 to 60 mass% hexaacrylate, 1 to 5 mass% 2-methyl-4'-methylthio-2-morpholinopropiophene, 1 to 5 mass% photoinitiator, 0.1 to 5 mass% photoinitiator assistant, and 0.1 to 10 mass% additive (silicone) was used as the material for forming the mask layer, so that the total mass was 100 mass%. By bonding the base layer and the adhesive layer together, a film roll was prepared having a layer structure in which, from outside to inside, the layers are arranged as follows: matte-type biaxially oriented polypropylene film / adhesive / white polyethylene terephthalate film / adhesive. The container was formed by assembling a sheet in which polypropylene resin was laminated on a paper base layer. According to the "Flap label aspects" in Table 1, the flap labels of Examples 1 to 5 and Comparative Example 1 were produced. Each flap label was adhered to the top surface of a container, and the performance of the flap label assuming repeated use was evaluated by the following evaluation method. The results are shown in Table 1.

[0082] <Evaluation of openability> The flap label was opened and closed repeatedly on the container 30 times, and the container was visually evaluated for the occurrence of lifting or tearing.

[0083] <Evaluation of adhesion> The flap label was opened and closed repeatedly 30 times on the container, and the presence or absence of remaining adhesive layer on the container was visually evaluated.

[0084] [Table 1]

[0085] As shown in Table 1, in the flap labels of Examples 1, 2, 4, and 5 in which the mask layers (first mask layer and second mask layer) were provided, no breakage of the container occurred when the label was opened, and the container lift was slight (small on the first try) and did not cause any practical problems. In the flap label of Example 3, breakage of the container was observed on the first try, but the container lift was slight (small on the first try) and did not cause any practical problems. Thus, it was shown that the flap labels of Examples 1 to 5 suppressed damage to the container to a certain extent or more. In contrast, in the flap label of Comparative Example 1 in which the mask layer was not provided, breakage of the container occurred on the first try when the label was opened, and the container also lifted significantly on the first try, and damage to the container was observed.

[0086] [Test Example 2] Using the same materials as those in Test Example 1 as the materials for the base layer, adhesive layer, and mask layer, flap labels of Examples 6 to 18 were produced according to the "Flap label aspects" in Tables 2 to 3. Each flap label was adhered to the top surface of a container in the same manner as in Test Example 1, and the performance of the flap label was evaluated for ease of opening and adhesion using the same evaluation method as in Test Example 1. Furthermore, the sealability was evaluated using the following evaluation method. The results are shown in Tables 2 to 3. Note that Table 3 also shows the results of Example 6 in Table 2 for reference.

[0087] <Evaluation of sealing performance> The flap label was opened and closed repeatedly 30 times on the container, and the adhesion of the flap label to the container in the closed state was visually evaluated.

[0088] [Table 2]

[0089] [Table 3]

[0090] As shown in Table 2, in the flap labels of Examples 7 to 10, which have a first mask layer facing the periphery of the opening, a second mask layer provided on the gripping portion, and a third mask layer provided parallel to the tensile direction of the base layer, and the second mask layer has an extension portion extending to both outsides of the gripping portion and a protrusion, no breakage of the container occurred when opening, and the floating of the container was slight (small on the first try) and did not cause any practical problems. In the flap labels of Examples 6, 11 and 12, breakage of the container was observed on the first try, but the floating of the container was slight (small on the first try) and did not cause any practical problems. Thus, it was shown that the flap labels of Examples 6 to 12 suppressed damage to the container to a certain extent or more. In addition, it was shown that all of the flap labels of Examples 6 to 12 have excellent sealing properties.

[0091] As shown in Table 3, in addition to the first mask layer and the second mask layer, the flap labels of Examples 13 to 16 have a fifth mask layer provided on the entire area other than the first mask layer and the second mask layer, and the second mask layer has an extension portion extending to both outsides of the grip portion and a protrusion. In the flap label of Example 17 in which the second mask layer has a protrusion but does not have an extension portion, and the flap label of Example 18 in which the second mask layer has an extension portion but does not have a protrusion, neither the container was broken nor the container was lifted when opened. In this way, it was shown that the flap labels of Examples 13 to 18 suppressed damage to the container to a certain extent. In addition, when comparing the flap label of Example 6 with the flap labels of Examples 13 to 18, the flap labels of Examples 13 to 18 were superior to Example 6 in terms of openability, and Example 6 was superior to Examples 13 to 18 in terms of adhesion.

[0092] [Test Example 3] Using the same materials as those in Test Example 1 as the materials for the base layer, adhesive layer, and mask layer, flap labels of Examples 19 to 20 were produced according to the "Flap label aspects" in Table 4. Each flap label and the flap label of Comparative Example 1 were adhered to the top surface of a container in the same manner as in Test Example 1, and the performance of the flap labels was evaluated for openability at room temperature and openability in a refrigerator using the following evaluation method. The results are shown in Table 4.

[0093] <Evaluation of opening property at room temperature> After storing the containers with flap labels at room temperature (25°C) for 4 days, the flap labels were opened and closed 30 times and the containers were visually inspected for floating or tearing.

[0094] <Evaluation of opening properties when refrigerated> The containers with flap labels were stored in a refrigerator (5°C) for four days, then left to stand at room temperature for 30 minutes. The flap labels were then opened and closed 30 times, and the containers were visually evaluated for any floating or tears.

[0095] [Table 4]

[0096] As shown in Table 4, the flap labels of Examples 19 to 20 did not break or float when opened during storage at room temperature. The flap labels of Examples 19 to 20 broke the container the first time they were opened during storage in a refrigerator, but did not float. Thus, it was shown that the flap labels of Examples 19 to 20 suppressed damage to the container to a certain degree or more during both storage at room temperature and storage in a refrigerator. In contrast, the flap label of Comparative Example 1 broke the container the first time they were opened during storage at room temperature, and the container also floated significantly the first time, and damage to the container was observed. The flap label of Comparative Example 1 broke the container the first time they were opened during storage in a refrigerator, but did not float. Thus, the flap label of Comparative Example 1 was inferior in openability to the flap labels of Examples 19 to 20.

[0097] [Test Example 4] In the above Test Example 3, the change in adhesive strength is considered to be the cause of the change in the tendency of the flap label to be easily opened due to the difference in the storage environment. Therefore, the change in adhesive strength between the flap label and the container over time (the change in adhesive strength when the flap label is first lifted from the container) was confirmed by the following evaluation method.

[0098] (Adhesive strength change test under different storage conditions) The flap label of Example 1 was adhered to the top surface of a container in the same manner as in Test Example 1, and the pressure was 31.2 kgf / m 2 The samples were pressed (pressed) for 30 seconds at a pressing force of 1000 MPa to obtain samples for evaluation. The samples were then stored in an environment of room temperature (25°C), refrigerated (5°C), frozen (-20°C), and high temperature (50°C), and immediately after each storage, and 1 day, 3 days, 1 week, 2 weeks, 3 weeks, 4 weeks, and 8 weeks after each storage, the flap labels were cut to a width of 15 mm, and the adhesive strength (N / 15 mm) was measured using a tensile tester (Strograph VE50D, manufactured by Toyo Seiki Seisakusho Co., Ltd.) according to the adhesive strength measurement method described above. The results are shown in Figure 8.

[0099] As shown in FIG. 8, it was revealed that the change in adhesive strength of the flap label over time differs greatly depending on the storage environment. FIG. 8 shows that the increase in adhesive strength over time is greater in room temperature storage than in refrigerated storage. It is considered that the greater the adhesive strength, the more likely the container is to break when opened. However, in the flap labels of Examples 19 to 20 in the above-mentioned Test Example 3, no breakage occurs after room temperature storage, but breakage occurs after refrigerated storage. The reason for this is presumably that condensation occurs when the label is left at room temperature after refrigerated storage, and the moisture from this condensation is absorbed by the paper base layer of the container, making the container more likely to break. Therefore, it was suggested that it is necessary to design the flap label and the container taking into account such changes in adhesive strength. [Industrial Applicability]

[0100] The container with a flap label and the flap label of the present invention can be used, for example, as containers and lid materials for enclosing cosmetics, hygiene products, medicines, quasi-drugs, cleaning products, food, seasonings, oils and fats, chemicals, and chemical agents. [Explanation of symbols]

[0101] 10 Flap Label 11 Base material layer 13 Grip part 15 Adhesive layer 15aa Notch 17 Mask Layer 17a Mask layer (first mask layer) 17b Mask layer (second mask layer) 17c Mask layer (third mask layer) 17d Mask layer (fourth mask layer) 17e Mask layer (fifth mask layer) 50 containers 51 Top section 53 Lid 56 Connecting part 57 Aperture 60 sheets 60a sheet 60b sheet 61 Base material layer 63 Resin layer 100 containers with flap labels

Claims

1. A flap label for opening and closing a container, A base layer covering an opening formed in the container; an adhesive layer that releasably adheres the base layer to the container; Equipped with A flap label in which a mask layer that partially weakens or eliminates the adhesive force between the container and the adhesive layer is provided on the surface of the adhesive layer so as to face the peripheral portion of the opening.

2. The flap label according to claim 1 , wherein the mask layer has a cutout that partially exposes the adhesive layer underneath to the container side.

3. The flap label according to claim 2 , wherein a gripping portion that is pulled when opening and closing the container is integral with the base layer, and the mask layer is further provided on at least a portion of the surface of the gripping portion.

4. The flap label according to claim 3 , wherein the cutout portion is provided in a position adjacent to the gripping portion.

5. The flap label according to claim 4 , wherein the mask layer is formed so as to protrude from the gripping portion toward the notch portion.

6. The flap label according to claim 3 , wherein when the gripping portion is pulled to peel the base layer from the container, the mask layer is further provided parallel to the direction in which the base layer is pulled.

7. 7. The flap label according to claim 6, wherein the area ratio [S2 / (S1+S2)×100] of the area S2 of the mask layer to the sum of the area S1 of the adhesive layer that extends outside the opening in parallel to the tensile direction of the base material layer and that extends in a region including the mask layer that is furthest from each other and the area S2 of the mask layer is 20 to 80%.

8. The flap label according to claim 7 , wherein the mask layer is formed in a pattern including a half-tone pattern, a stripe pattern, and / or a dot pattern.

9. The flap label according to claim 8 , further comprising a mask layer disposed perpendicular to the tensile direction of the base layer.

10. The difference (Fa-F0) between the adhesive strength (F0) when re-opened immediately after the initial opening and closing and the adhesive strength (Fa) when re-opened after storage at room temperature (25°C) for 4 weeks is 2.0 to 8.0 N / 15 mm; 2. The flap label according to claim 1, wherein the difference (Fb-F0) between the adhesive strength (F0) and the adhesive strength (Fb) when reopened after storage at a low temperature (5°C) for 4 weeks is 1.0 to 7.0 N / 15 mm.

11. A flap label according to any one of claims 1 to 10; a container having an opening that is opened and closed by the flap label; A container with a flap label.

12. A lid portion is provided to close the opening before opening, The lid portion is integrated with the top surface portion of the container by a connecting portion before the first opening, The container with a flap label according to claim 11, wherein the flap label is initially lifted, and the lid portion is separated from the top portion following the flap label, thereby forming the opening.

13. 13. The container with a flap label according to claim 12, wherein the container is made of a sheet including a base layer made of paper.

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