Packaging

Abstract

To provide a package which is a package which comprises a container having an opening and a lid member sealed around the opening so as to close the opening and can be repeatedly opened and closed, and has tamper-evident function.SOLUTION: A package according to the present invention includes: a container having an opening 21; and a lid material that is sealed to the peripheral edge 22 of the opening 21, has a base sheet 11 having heat-sealing properties, an adhesive layer 12 and a sealant layer 13, and is configured by laminating the base sheet 11, the adhesive layer 12, and the sealant layer 13 in this order, the lid material has a tab 10a protruding outward from a seal line formed on the peripheral edge 22, and the adhesive layer 12 and the sealant layer 13 can be repeatedly peeled off and re-adhered, at least a partial region of the tab 10a is provided with a tab welded portion where the base sheet 12 and the sealant layer 13 are welded.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a package.

Background Art

[0002] There is a known package that can repeatedly open and close an opening by sealing a lid material around the periphery of the opening of a container and repeatedly adhering and peeling the lid material. For example, it is widely used for containing contents such as wet tissues (see Patent Document 1).

[0003] The lid material constituting the package is formed by laminating a base material sheet, an adhesive layer, and a sealant layer in this order, and is laminated so that peeling and re-adhesion can be repeated between the adhesive layer and the sealant layer. And the lid material is sealed to the periphery of the opening of the container so as to close the opening of the container. Further, the lid material has a tab protruding outward.

[0004] In the package, when the tab is grasped as a gripping piece and pulled upward, first, at the sealing position around the periphery of the opening, since the sealant layer and the container are firmly sealed, the adhesive layer and the sealant layer are peeled from each other, and the lid material is separated from the container so that the adhesive layer is exposed on the surface. Next, at the position of the opening, since the sealant layer and the container are not sealed, the sealant layer is separated from the container while remaining adhered to the adhesive layer, and as a result, the package opens. And the lid material separated from the container can close the opening of the container again by re-adhering this to the remaining sealant layer of the container because the adhesive layer is exposed on the surface at the sealing position around the periphery of the opening. And this opening and closing can be repeatedly executed many times.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

[0006] However, the packaging described in Patent Document 1 can be opened and closed repeatedly, and therefore does not have a function (tamper-evident function) that allows for the distinction between a used, opened package and an unopened, unopened package. For this reason, when this packaging is sold commercially, it is further placed in an outer bag and sealed to guarantee that the packaging is unopened.

[0007] The present invention has been made in consideration of these circumstances, and aims to provide a packaging body that has a tamper-evident function, comprising a container having an opening and a lid material sealed around the periphery of the opening to close the opening, and which can be opened and closed many times. [Means for solving the problem]

[0008] To solve the above problems, this invention proposes the following means. A packaging body according to a first aspect of the present invention comprises a container having an opening, a base sheet sealed around the periphery of the opening to close the opening and having heat-sealability, an adhesive layer, and a sealant layer, and a lid material formed by laminating the base sheet, the adhesive layer, and the sealant layer in this order, wherein the lid material has a tab protruding outward from a seal line formed on the periphery of the opening, the adhesive layer and the sealant layer are repeatedly peeled off and re-adhered to each other, and at least a portion of the tab is provided with a tab welded portion in which the base sheet and the sealant layer are welded together without the adhesive layer.

[0009] According to a second aspect of the present invention, the packaging according to the first aspect is characterized in that the sealant layer and the container are welded together at the tab welding portion.

[0010] According to a third aspect of the present invention, the packaging according to the first or second aspect is characterized in that, at the periphery of the opening, at least a portion of the area opposite to the tab provided on one side of the lid material with respect to the center of the lid material, is provided with an end-side welded portion in which the base sheet and the sealant layer are welded together without the adhesive layer.

[0011] According to a fourth aspect of the present invention, the packaging according to the first or second aspect is characterized in that the opening is formed in the container that spans two surfaces.

[0012] According to a fifth aspect of the present invention, the packaging according to the first or second aspect is characterized in that the opening has a flange on its periphery, and the lid material is sealed to the flange.

[0013] According to a sixth aspect of the present invention, the packaging according to the first or second aspect is characterized in that the opening is provided with a flange formed by wrapping a sheet constituting the body around the outside of the opening, and the lid material is sealed to the flange.

[0014] According to a seventh aspect of the present invention, the packaging according to the first or second aspect is characterized in that the adhesive layer is thermoplastic, and the lid material is formed by extrusion lamination in which the adhesive layer is pressed onto the base sheet and the sealant layer. [Effects of the Invention]

[0015] According to the package of the present invention, since a tab welding part where a base material sheet of the lid material and a sealant layer are welded is provided in a partial region of the tab at the end of the lid material, when the lid material is peeled off from the container and opened, at the position of this tab welding part, the base material sheet and the sealant layer, or the sealant layer and the container must be separated. And the separated part cannot be restored, and moreover, its trace remains, so it becomes possible to distinguish between what has been once opened for use and what has never been opened, an unopened one.

Brief Description of the Drawings

[0016] [Figure 1] (a) is a perspective view for explaining a package according to the first embodiment of the present invention, and (b) is a cross-sectional view of a main part for explaining the same package. [Figure 2] (a) is a perspective view for explaining the package when opened, and FIG. 2(b) is a cross-sectional view of a main part for explaining the same package when opened. [Figure 3] It is a perspective view for explaining a package according to the second embodiment of the present invention. [Figure 4] It is a perspective view for explaining a package according to the third embodiment of the present invention. [Figure 5] It is a perspective view for explaining a package according to the fourth embodiment of the present invention. [Figure 6] It is a perspective view for explaining a package according to the fifth embodiment of the present invention. [Figure 7] It is a cross-sectional view of a main part for explaining the same package. [Figure 8] It is a cross-sectional view of a main part for explaining the same package when opened.

Modes for Carrying Out the Invention

[0017] (First Embodiment) The first embodiment of the present invention will be described with reference to FIGS. 1 to 2. Fig. 1(a) is a perspective view for explaining the package A according to the first embodiment of the present invention, and Fig. 1(b) is a sectional view of the main part for explaining the package A. Fig. 2(a) is a perspective view for explaining the package A when opened, and Fig. 2(b) is a sectional view of the main part for explaining the package A when opened.

[0018] As shown in Fig. 1 or Fig. 2, the package A according to the first embodiment of the present invention includes a container 20 and a lid member 10.

[0019] The package A according to the first embodiment is an example in which a pillow bag is used as the container 20 having an opening 21.

[0020] The packaging material constituting this pillow bag has heat-sealable resin layers arranged on both the front and back surfaces. The pillow bag may be composed of this packaging material with a single layer of heat-sealable resin layer, or a layer serving as a base material may be interposed therebetween. Examples of the heat-sealable resin include polyolefin resins such as low-density polyethylene resin, linear low-density polyethylene resin, medium-density polyethylene resin, and polypropylene resin. Further, as the packaging material base material, for example, it has a multilayer structure having polyester resin, polyamide resin, ethylene-vinyl alcohol resin, polyvinyl chloride resin, polycarbonate resin, polyacrylonitrile resin, acrylic resin, etc. Also, the packaging material base material may have a vapor-deposited film or the like having an inorganic vapor-deposited film such as a metal foil, a metal vapor-deposited film, or an inorganic oxide in its layer structure. Each layer may be adhesively laminated by heat melting or may be adhesively laminated with an adhesive.

[0021] The container 20 is provided with an opening 21 that serves as an outlet for the contents. In this example, the opening 21 is formed in a rectangular shape on the surface without a back seal line. Examples of the contents include tissue paper. Also, the contents may be confectionery such as gummies or chocolates. In Figs. 1 and 2, the illustration of the contents is omitted.

[0022] Next, the lid material 10 is constructed by laminating a base sheet 11, an adhesive layer 12, and a sealant layer 13 in that order. The adhesive layer 12 and the sealant layer 13 are laminated in such a way that they can be repeatedly peeled off and re-adhered to each other. The adhesive layer 12 is thin. Therefore, when strong heat and pressure are applied to the lid material 10, the adhesive layer 12 in the area where heat and pressure are applied moves to the surrounding area. As a result, the base sheet 11 and the sealant layer 13 come into direct contact and are welded together.

[0023] The base sheet 11 is formed from any resin layer. The base sheet 11 may have a single-layer structure or a multi-layer structure. Furthermore, the base sheet 11 may have layers of materials other than resin, such as metal or resin, interposed between the multiple resin layers. Examples of resins constituting the base sheet 11 include polyolefin resin, polyester resin, polyamide resin, ethylene-vinyl alcohol resin, polyvinyl chloride resin, polycarbonate resin, polyacrylonitrile resin, and acrylic resin. Examples of layers of materials other than resin include metal foil such as aluminum foil, metal vapor-deposited films, and inorganic vapor-deposited film paper such as inorganic oxides.

[0024] The adhesive layer 12 can be formed by applying a known adhesive. The adhesive layer 12 may use an adhesive such as an acrylic, butyl rubber, natural rubber, silicone, or polyisobutyl adhesive on its own. Furthermore, the adhesive layer 12 may also contain appropriate additives such as agglomerating components like alkyl methacrylate, vinyl ester, acrylonitrile, styrene, and vinyl monomer; modifying components such as unsaturated carboxylic acids, hydroxyl group-containing monomers, and acrylonitrile; or polymerization initiators, plasticizers, curing agents, curing accelerators, and antioxidants.

[0025] Furthermore, the sealant layer 13 can be made from polyolefin resins, as exemplified as heat-sealable resins that make up the container 20. Specifically, the sealant layer 13 can be low-density polyethylene resin, linear low-density polyethylene resin, medium-density polyethylene resin, polypropylene resin, etc.

[0026] In the present invention, a composite material constructed by laminating an adhesive layer 12 and a sealant layer 13 in that order can also be used as a resealable sealant (resealable sealant). For example, "Diamilon® MF RE," which is commercially available from Mitsubishi Chemical Corporation, can be used. The lid material 10 may also have a printed layer formed on the adhesive layer 12 side of the base sheet 11, or other films or the like may be laminated on it.

[0027] In this embodiment, the lid material 10 is sealed to the periphery (edge) 22 of the container opening so as to close the opening 21. However, the lid material 10 can be divided into several regions depending on its positional relationship with the container 20 in the state sealed by the lid material 10.

[0028] First, there is the tab 10a that protrudes outward from the seal line formed on the periphery 22 of the container opening. The tab 10a is provided on the lid material 10. The tab 10a serves as a gripping piece when peeling the lid material 10 from the container 20 to open it, and is positioned to protrude outward from the seal line formed on one side of the periphery 22 of the container opening, which is the starting point for peeling. In the area of ​​this tab 10a, strong heat pressure is applied to the lid material 10 in at least a part of it. As a result, the adhesive layer 12 between the base sheet 11 and the sealant layer 13 moves around this area. Then, the base sheet 11 and the sealant layer 13 come into direct contact and are welded together without the adhesive layer 12 in between. When the area where the base sheet 11 and the sealant layer 13 are welded together is called the "tab welded area 10x", in this tab welded area 10x, not only are the base sheet 11 and the sealant layer 13 welded together, but the sealant layer 13 is also sealed to the container 20. Therefore, the base sheet 11, the sealant layer 13, and the container 20 are welded together as a single unit. For the lid material 10 to be peeled off from the container 20 and open, the tab weld portion 10x, to which the base sheet 11, the sealant layer 13, and the container 20 are welded together as a single unit, must be broken. The broken part cannot be restored, and moreover, a trace of the break remains.

[0029] Next, adjacent to the tab 10a is the peripheral seal region 10b, where the lid material 10 is sealed to the periphery 22 of the container opening. Following this is the opening-corresponding region 10c, which covers and closes the container opening 21. The periphery 22 of the container opening is provided in a closed curve shape surrounding the opening-corresponding region 10c. Therefore, as the peeling of the lid material 10 progresses, the peeling reaches the peripheral seal region 10b again, following the opening-corresponding region 10c. The peripheral seal region 10b is located on the opposite side of the tab 10a, which is provided on one side of the lid material 10 with the center of the lid material 10 in between, on the periphery seal region 10b of the container opening periphery 22. For the sake of explanation, the peripheral seal region 10b following the opening-corresponding region 10c will be described in this way, divided into two parts.

[0030] First, in the peripheral sealing region 10b following the opening corresponding region 10c, there is a portion where the base sheet 11 and the sealant layer 13 are in direct contact and welded together without the adhesive layer 12 in between. When this portion is called the "end-side welded portion 10y," it is a portion where strong heat and pressure is applied to the lid material 10, similar to the tab welded portion 10x. Therefore, in the end-side welded portion 10y, the base sheet 11, the sealant layer 13, and the container 20 are welded together as a single unit. Since the end-side welded portion 10y is a portion where the base sheet 11, the sealant layer 13, and the container 20 are welded together as a single unit, similar to the tab welded portion 10x, the lid material 10 can be broken and peeled off if pulled with strong force. The broken part cannot be restored, and moreover, a trace of it remains.

[0031] The peripheral seal region 10b following the opening-corresponding region 10c can be divided into two regions based on the end-side welded portion 10y: the opening-side peripheral seal region 10b1 located on the opening-corresponding region 10c side, and the end-side peripheral seal region 10b2 located on the opposite side. When the lid material 10 is peeled off to create an opening, the opening-side peripheral seal region 10b1 is the region where the lid material 10 is peeled off. In contrast, the end-side peripheral seal region 10b2 is the region where the lid material 10 is not peeled off and remains connected to the container 20.

[0032] Next, this packaging A can be opened as follows. As shown in Figure 2, when the lid material 10 is grasped by the tab 10a and pulled upward, it separates from the adhesive layer 12 and the sealant layer 13 in the area of ​​the tab 10a. However, even within the area of ​​the tab 10a, the adhesive layer 12 is not present in the tab welded portion 10x. Therefore, the lid material 10 separates from the container 20 by breaking either the weld between the base sheet 11 and the sealant layer 13, or the weld between the sealant layer 13 and the container 20. The force required to break the weld between the base sheet 11 and the sealant layer 13, or the force required to break the weld between the sealant layer 13 and the container 20, is greater than the force required to separate the adhesive layer 12 and the sealant layer 13. Furthermore, as mentioned above, if the weld between the base sheet 11 and the sealant layer 13, or between the sealant layer 13 and the container 20, is broken, it cannot be restored, and traces will remain. Whether the weld between the base sheet 11 and the sealant layer 13 or between the sealant layer 13 and the container 20 breaks depends on the relative strengths of the two welds. Either can break, but Figure 2(b) illustrates an example where the lid material 10 is pulled upward with a force greater than the force required to break the weld between the base sheet 11 and the sealant layer 13, resulting in the weld between the base sheet 11 and the sealant layer 13 being broken and the base sheet 11 peeling off from the sealant layer 13.

[0033] Then, when the lid material 10 is pulled upward with a force greater than the force required to separate it from the adhesive layer 12 and the sealant layer 13, the separation of the lid material 10 from the container 20 progresses. In the peripheral seal region 10b, the lid material 10 separates from the adhesive layer 12 and the sealant layer 13, as shown in Figure 2(b). The sealant layer 13 remains on the container 20 side, and the adhesive layer 12 is separated together with the base sheet 11. In Figure 2(b), the reference numeral "132" indicates the sealant layer 13 remaining on the container 20 side, and the reference numeral "122" indicates the adhesive layer 12 separated together with the base sheet 11. Since the adhesive layer 122 is exposed on the surface of the separated lid material 10 that faces the container 20 (the container side surface), it is possible to reseal the lid material 10 by re-adhering the adhesive layer 122 to the sealant layer 132.

[0034] Next, the delamination between the lid material 10 and the container 20 progresses to the opening area 10c. Since the opening area 10c is not sealed to the container 20, the sealant layer 13 ruptures at the boundary between the peripheral sealing area 10b and the opening area 10c. In the opening area 10c, the sealant layer 13 peels off from the container 20 together with the base sheet 11 and the adhesive layer 12. In Figure 2(b), the sealant layer 13 that has peeled off from the container 20 in this way is indicated by the reference numeral "131".

[0035] As the delamination between the lid material 10 and the container 20 progresses further, this delamination reaches the peripheral seal region 10b again. This is the opening-side peripheral seal region 10b1. In this opening-side peripheral seal region 10b1, the sealant layer 13 of the lid material 10 and the container 20 are sealed to each other. Therefore, the sealant layer 13 again breaks at the boundary between the opening-corresponding region 10c and the opening-side peripheral seal region 10b1. In the opening-side peripheral seal region 10b1, the adhesive layer 12 delaminates between the adhesive layer 12 and the sealant layer 13 and is peeled off together with the base sheet 11, while the sealant layer 13 remains on the container 20 side. In Figure 2(b), the reference numeral "132" indicates the sealant layer 13 remaining on the container 20 side. The adhesive layer 12 is exposed on the surface of the delaminated lid material 10 that faces the container 20 (the container-side surface).

[0036] As mentioned above, the periphery 22 of the container opening is provided in a closed curve shape surrounding the opening-corresponding region 10c. Therefore, including the opening-side periphery sealing region 10b1, the periphery sealing region 10b is configured in a closed curve shape surrounding the opening-corresponding region 10c.

[0037] Next, the separation of the lid material 10 from the container 20 reaches the terminal welding portion 10y. At the terminal welding portion 10y, the base sheet 11 of the lid material 10, the sealant layer 13, and the container 20 are integrally welded together. The force required to break the welding between the base sheet 11 and the sealant layer 13 or between the sealant layer 13 and the container 20 and separate the lid material 10 is greater than the force required to separate the adhesive layer 12 and the sealant layer 13 in the opening-side peripheral seal region 10b1. If the force pulling the lid material 10 upward is greater than the force required to separate the adhesive layer 12 and the sealant layer 13, and less than the force required to break the welding between the base sheet 11 and the sealant layer 13 or between the sealant layer 13 and the container 20, the separation of the lid material 10 from the container 20 ends here and does not proceed any further. In other words, the lid material 10 is not peeled off in the terminal peripheral sealing region 10b2 and remains connected to the container 20.

[0038] The contents can then be removed from the opened opening 21.

[0039] Incidentally, as can be seen from Figures 2(a) and (b), the detached lid material 10 is in the same state as when it has been rotated around the terminal peripheral seal region 10b2 as the pivot axis. Therefore, by rotating the lid material 10 back to its original position and re-adhering the adhesive layer 122 exposed in the peripheral seal region 10b, including the opening-side peripheral seal region 10b1, to the sealant layer 132 remaining on the container 20 side, the container 20 can be closed again. This opening and closing can be repeated many times.

[0040] In this packaging A, in order to peel the lid material 10 from the container 20 and open it, the tab weld portion 10x, to which the base sheet 11, sealant layer 13, and container 20 are integrally welded, must be broken. The broken part cannot be restored, and a trace of the break remains, making it possible to distinguish between a used and opened product and an unopened product that has never been opened.

[0041] Furthermore, even if one attempts to open this packaging A by peeling off the lid material 10 from the end-side peripheral seal area 10b2, the end-side welded portion 10y is located in this end-side peripheral seal area 10b2. In this end-side welded portion 10y, just like the tab welded portion 10x, the base sheet 11, the sealant layer 13, and the container 20 are integrally welded together. Therefore, the torn portion cannot be restored, and a trace of the tear remains, making it possible to distinguish between a package that has been opened and used and an unopened package that has never been opened.

[0042] Although the first embodiment of the present invention has been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes and the like are also included within the scope of the gist of the present invention. Furthermore, the components shown in the above-described embodiment and the following modifications can be combined as appropriate.

[0043] (Second embodiment) Next, Figure 3 shows a second embodiment in which a container 30 is used as the container, the opening of which spans two surfaces. In this case as well, the lid material 10 is sealed around the periphery of the opening to close it, so that it can be opened and closed repeatedly, just like in the first embodiment. It is also possible to distinguish between containers that have been opened and used and those that have never been opened and remain unopened.

[0044] (Third embodiment) Figure 4 shows a third embodiment in which a container 40 formed by a deep drawing method such as vacuum forming is used as the container. The container 40 has an opening on its top surface. The opening has a flange around its periphery. In this case as well, the lid material 10 is sealed to the flange around the opening so as to close the opening, so that it can be opened and closed repeatedly, as in the first embodiment. As shown in the figure, the tab 10a can be folded and sealed along the body of the container 40. In this example as well, it is possible to distinguish between a container that has been opened and used and an unopened container that has never been opened.

[0045] (Fourth embodiment) Figure 5 shows a fourth embodiment in which a paper cup 50 is used as the container. The paper cup 50 also has an opening on its top surface, and a flange is provided around the periphery of the opening by wrapping the sheet that makes up the body around the outside of the opening. In this case as well, the lid material 10 is sealed to the flange around the periphery of the opening so as to close the opening, so that it can be opened and closed repeatedly as in the first embodiment. As shown in the figure, the tab 10a can be folded and sealed along the body of the paper cup 50. In this example as well, it is possible to distinguish between a cup that has been opened and used and an unopened cup that has never been opened.

[0046] (Fifth embodiment) Next, Figure 6 shows a packaging E of a fifth embodiment in which a rectangular cup-shaped container 60 is used as the container. As the rectangular cup-shaped container 60, resin containers such as polystyrene or polypropylene, or paper containers made by molding synthetic resin processed paper, which is made by laminating a synthetic resin film or metal foil onto cup paper or cardboard, can be used.

[0047] The rectangular cup-shaped container 60 has a substantially rectangular opening 61 on its upper surface. A flange 63 is provided around the periphery 62 of the opening 61.

[0048] The rectangular cup-shaped container 60 is filled with a liquid substance (not shown), such as yogurt. However, the contents are not limited to this embodiment and may include other fermented dairy products, fermented milk, beverages such as coffee, etc.

[0049] The lid material 10p is heat-sealed, for example, to the flange 63 of the peripheral edge 62 to close the opening 61. The lid material 10p is constructed by laminating a base sheet 11, an adhesive layer 12, and a sealant layer 13 in the same order as in the first embodiment. In this embodiment, the lid material 10p is used for a rectangular cup-shaped container 60 filled with yogurt as the contents. Therefore, the rectangular cup-shaped container 60 and the lid material 10p can be those that conform to the Ministerial Ordinance on Milk and Dairy Products (Ministerial Ordinance on Standards for Ingredients of Milk and Dairy Products, Ministry of Health and Welfare Ordinance No. 52 of December 27, 1951). For example, the rectangular cup-shaped container 60 can be made of resin such as polystyrene or polypropylene, or of paper molded from synthetic resin-processed paper. The lid material 10p is made of a material containing aluminum (AL), etc.

[0050] In this embodiment, the adhesive layer 12 may be a hot-melt adhesive mainly composed of a thermoplastic polymer. When a hot-melt adhesive is used, for example, the lid material 10p is formed by extrusion lamination, in which the molten thermoplastic adhesive layer 12 is extruded from a T-die and pressed onto the base sheet 11 and the sealant layer 13.

[0051] Similar to the first embodiment, the lid material 10p can be divided into several regions depending on its positional relationship with the rectangular cup-shaped container 60. As shown in Figures 6 and 7, the tab 10a is provided on the lid material 10 protruding outward from the periphery 62, similar to the fourth embodiment, and is folded and sealed along the body of the rectangular cup-shaped container 60. However, in this embodiment, the entire tab 10a is not sealed to the rectangular cup-shaped container 60, and only the tab welded portion 10x is sealed to the rectangular cup-shaped container 60 by strong heat and pressure.

[0052] Furthermore, as shown in Figure 7, the lid material 10p, similar to the first embodiment, has the following regions provided in order from the tab 10a on one side of the lid material 10p, straddling the center of the lid material 10p, toward the opposite side: a peripheral sealing region 10b, an opening corresponding region 10c, and another peripheral sealing region 10b. In addition, the peripheral sealing region 10b on the opposite side of the peripheral 62 of the lid material 10p is provided with an end-side welding portion 10y, which is subjected to strong heat and pressure on the lid material 10p, similar to the tab welding portion 10x. The packaging body E can be opened by peeling the lid material 10 from the rectangular cup-shaped container 60 using the same opening method as in the first embodiment. In this embodiment, the peripheral sealing region 10b is a single region, but similar to the first embodiment, it may be divided into two regions: an opening-side peripheral sealing region 10b1 and an end-side peripheral sealing region 10b2.

[0053] In this embodiment, the lid material 10p is heat-sealed to the flange 63 on its periphery 62 so as to close the opening 61. This prevents the liquid yogurt contents from leaking out of the opening 61.

[0054] In this embodiment, since the adhesive layer 12 is not present in the tab welding portion 10x of the tab 10a region, either the welding between the base sheet 11 and the sealant layer 13 or the welding between the sealant layer 13 and the container 20 is broken, and the lid material 10p peels off from the rectangular cup-shaped container 60. In this embodiment, as shown in Figure 8, the welding between the base sheet 11 and the sealant layer 13 breaks, and the lid material 10p peels off from the rectangular cup-shaped container 60. As a result, the packaging E cannot restore the peeled portion of the sealant layer 13, and a trace remains. Therefore, the packaging E can distinguish between one that has been opened and one that has never been opened and one that is unopened. Note that the peeled portion is not particularly limited, and it may also be the case when the welding between the sealant layer 13 and the rectangular cup-shaped container 60 breaks.

[0055] Furthermore, in this embodiment, the lid material 10 peels off between the adhesive layer 12 and the sealant layer 13 in the peripheral sealing region 10b, as shown in Figure 8. The sealant layer 13 remains on the side of the rectangular cup-shaped container 60, while the adhesive layer 12 peels off together with the base sheet 11. Since the adhesive layer 122 is exposed on the surface of the lid material 10p facing the rectangular cup-shaped container 60, the lid material 10p can be resealed by re-adhering the adhesive layer 122 to the sealant layer 132. Therefore, for example, in a yogurt container, it is possible to eliminate the cover lid or the like that was conventionally provided above the lid material 10p to prevent the contents from spilling out.

[0056] Furthermore, in this embodiment, in the opening-corresponding region 10c, the sealant layer 13 peels off from the rectangular cup-shaped container 60 together with the base sheet 11 and the adhesive layer 12. Subsequently, the peeling of the lid material 10p from the rectangular cup-shaped container 60 reaches the terminal welding portion 10y provided in the peripheral seal region 10b. However, strong heat and pressure are applied to the lid material 10p at the terminal welding portion 10y. At the terminal welding portion 10y, similar to the first embodiment, the base sheet 11 of the lid material 10, the sealant layer 13, and the rectangular cup-shaped container 60 are integrally welded together. Note that the force required to break the welding between the base sheet 11 and the sealant layer 13 or between the sealant layer 13 and the rectangular cup-shaped container 60 and peel off the lid material 10 is greater than the force required to peel the adhesive layer 12 from the sealant layer 13 in the peripheral seal region 10b. If the force pulling the lid material 10p upward is greater than the force required to separate the adhesive layer 12 and the sealant layer 13, and less than the force required to break the weld between the base sheet 11 and the sealant layer 13 or the weld between the sealant layer 13 and the container 20, then the separation of the lid material 10p from the rectangular cup-shaped container 60 ends at the terminal weld portion 10y and does not proceed any further. Therefore, the lid material 10p is not separated and can remain connected to the rectangular cup-shaped container 60. However, if the force pulling the lid material 10p upward is greater than the force required to break the weld between the base sheet 11 and the sealant layer 13 or the weld between the sealant layer 13 and the container 20, then the lid material 60 breaks and separates at the terminal weld portion 10y. Since the torn portion cannot be restored and a trace of the damage remains, it is possible to distinguish between a package E that has been opened and used and an unopened package E that has never been opened.

[0057] In any of the above embodiments, the packaging according to the present invention comprises a container having an opening and a lid material sealed around the periphery of the opening to close the opening, and is capable of being opened and closed many times, and provides packaging that has a tamper-evident function.

[0058] (experiment) Next, an experiment was conducted to measure the peel strength in the peripheral sealing area 10b and the tab welding area 10x of the lid material 10p of the packaging body E according to the fifth embodiment, in order to confirm that the force required to break the weld between the base sheet 11 and the sealant layer 13 or the force required to break the weld between the sealant layer 13 and the rectangular cup-shaped container 60 is greater than the force required to peel between the adhesive layer 12 and the sealant layer 13. Note that the tab welding area 10x may also be measured in the area of ​​the terminal welding area 10y, where strong heat and pressure is applied to the lid material 10p in the same way as the tab welding area 10x.

[0059] The experimenter, as in the first embodiment, grasps the tab of the lid material 10p and pulls the lid material 10p upward to open the packaging. The experimenter applies a tensile force (300 mm / min) in the opposite direction from the direction in which they are welded together, separating the rectangular cup-shaped container 60 from the lid material 10p. At this time, the required peel strength (N / 15 mm) is measured for the peripheral seal area 10b and the tab welded portion 10x, respectively. The obtained measurement results are shown in Table 1. Here, peel strength refers to the strength of the welded portion when the rectangular cup-shaped container 60 and the lid material 10p are separated, and is the strength of the welded portion between the base sheet 11 and the sealant layer 13, the welded portion between the sealant layer 13 and the rectangular cup-shaped container 60, or the welded portion between the adhesive layer 12 and the sealant layer 13.

[0060] [Table 1]

[0061] In this case, the lid material 10p was made from the constituent materials listed in Table 1. Specifically, experiments were conducted using a laminated material (Reseal Sealant: Diamilon® MF RE) made by dry lamination using a polyester urethane adhesive. This laminated material consisted of a 12 μm thick biaxially oriented polyethylene terephthalate (PET) film with a printed layer (ink) on one side applied by gravure printing, a 7 μm thick aluminum foil (AL), an adhesive layer, and a sealant layer in that order, and a 60 μm thick co-extruded film. As shown in Table 1, the required peel strength in the peripheral seal area 10b was 8.6 N / 15 mm. The required peel strength in the tab welded area 10x was 11.7 N / 15 mm.

[0062] From the above results, it was found that the required peel strength in the tab-welded area 10x is higher than the required peel strength in the peripheral seal area 10b. The tab-welded area 10x is the area where strong heat and pressure is applied to the lid material 10p, causing the adhesive layer 12 to become thin. In other words, it was confirmed that the force required to break the tab-welded area 10x, where the base sheet 11 and the sealant layer 13 are welded together or the sealant layer 13 and the rectangular cup-shaped container 60 are welded together, is greater than the force required to peel between the adhesive layer 12 and the sealant layer 13 in the peripheral seal area 10b. Therefore, it can be concluded that the rectangular cup-shaped container 60 and the lid material 10p are separated and opened at the tab-welded area 10x by the breakage of the weld between the base sheet 11 and the sealant layer 13, or by the breakage (paper peeling) of the weld between the sealant layer 13 and the rectangular cup-shaped container 60. Furthermore, it can be considered that the rectangular cup-shaped container 60 and the lid material 10p are separated from each other between the adhesive layer 12 and the sealant layer 13 in the peripheral seal area 10b. [Industrial applicability]

[0063] The packaging according to the present invention consists of a container having an opening and a lid material sealed around the periphery of the opening to close it, and can be opened and closed many times, making it industrially applicable. [Explanation of symbols]

[0064] A: Packaging according to the first embodiment 10: Lid material 11: Base sheet 12: Adhesive layer 13: Sealant layer 10a: Tab 10b: Peripheral sealing area 10c: Opening corresponding area 10x: Tab welding area 10y: End welding area 20: Container (pillow bag) B: Packaging according to the second embodiment 30: Container (pillow bag) C: Packaging according to the third embodiment 40: Container (Squeezed molded container) D: Packaging according to the fourth embodiment 50: Container (paper cup) E: Packaging according to the fifth embodiment 10p: Lid material 60: Container (rectangular cup-shaped container)

Claims

1. A container having an opening, The periphery of the opening is sealed to close the opening, A heat-sealable base sheet, Adhesive layer, The sealant layer, A lid material having the above, and constructed by laminating the base sheet, the adhesive layer, and the sealant layer in this order, Equipped with, The lid material has a tab that protrudes outward from the seal line formed on the periphery of the opening, The adhesive layer and the sealant layer are capable of repeated peeling and re-adhesion between them. The packaging is characterized in that at least a portion of the tab is provided with a tab-welded portion in which the base sheet and the sealant layer are welded together without the adhesive layer in between.

2. The packaging according to claim 1, characterized in that the sealant layer and the container are welded together at the tab welding portion.

3. The packaging according to claim 1 or 2, characterized in that, at the periphery of the opening, at least a portion of the area opposite to the tab provided on one side of the lid material with the center of the lid material is provided, in which the base sheet and the sealant layer are welded together without the adhesive layer.

4. The packaging according to claim 1 or 2, characterized in that the opening is formed in the container that spans two surfaces.

5. The aforementioned opening is provided with a flange on its periphery. The packaging body according to claim 1 or 2, characterized in that the lid material is sealed to the flange.

6. The opening is provided with a flange formed by wrapping the sheet constituting the body around the outside of the opening at its periphery. The packaging body according to claim 1 or 2, characterized in that the lid material is sealed to the flange.

7. The adhesive layer is thermoplastic, The packaging body according to claim 1 or 2, characterized in that the lid material is formed by extrusion lamination, in which the adhesive layer is pressed onto the base sheet and the sealant layer.

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