Resealable container

Abstract

To provide a resealable container excellent in resealing properties even being a paper container.SOLUTION: A resealable container includes a resealable lid material and a container body. The resealable lid material includes a substrate layer, an adhesive layer, and a heat seal layer. The heat seal layer includes a heat seal resin having a sea-island structure in which an island phase containing a resin with a melting peak temperature 115-120°C by a DSC analysis is dispersed in a sea phase containing a polyethylene resin. The container body is formed with a paper material including a 15 μm or thicker coating layer containing a low-density polyethylene resin. The heat seal layer and a coating layer at a flange part of the container body are heat-sealed.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to resealable containers.

Background Art

[0002] Among foods and daily necessities, there are some that cannot be completely consumed in one use or eating and need to be consumed in multiple portions. In such cases, containers with a resealing function are useful. For example, there is known a resealable container that uses a lid material provided with an adhesive layer and a heat-sealing layer, seals the container body with the heat-sealing layer during container manufacturing, breaks the heat-sealing layer to expose the adhesive layer when the container is opened, and seals the container body with the exposed adhesive layer after the container is opened (for example, Patent Documents 1 to 3).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, when using a so-called paper container as the container body, since the paper material has lower strength than plastic, even if a resealable container is manufactured according to the guidance of the prior art, the paper container may be damaged during opening, etc., and the adhesive layer may not be exposed as intended, and it may not be possible to reseal.

[0005] The present disclosure has been made in view of the above circumstances, and an object thereof is to provide a resealable container that is made of a paper container and has excellent resealability.

Means for Solving the Problems

[0006] One aspect of the present invention includes, for example, the following embodiments. [1] A resealable container comprising a resealable lid material and a container body, wherein the resealable lid material includes a base material layer, an adhesive layer, and a heat-sealing layer, and the heat-sealing layer includes a heat-sealing resin having a sea-island structure in which island phases containing a resin having a melting peak temperature of 115 to 120°C by DSC analysis are dispersed in a sea phase containing a polyethylene resin, the container body is formed from a paper material having a coating layer with a thickness of 15 μm or more containing a low-density polyethylene resin, and the heat-sealing layer and the coating layer at the flange portion of the container body are heat-sealed, a resealable container. [2] The resealable container according to [1], wherein the difference between the melting start temperature and the melting end temperature of the heat-sealing resin by DSC analysis is 20°C or more. [3] The resealable container according to [1] or [2], wherein the resin having a melting peak temperature of 115 to 120°C by DSC analysis contains a polyamide-based resin. [4] The resealable container according to any one of [1] to [3], wherein the adhesive layer contains a styrene-based thermoplastic elastomer. [Advantages of the Invention]

[0007] According to the present disclosure, a resealable container that is a paper container and has excellent resealability is provided. [Brief Description of the Drawings]

[0008]

Figure 1

Figure 2

Figure 3

[0009] Hereinafter, preferred embodiments of the present disclosure will be described in detail. However, the present disclosure is not limited to the following embodiments.

[0010] <Resealable container> The resealable container according to the present disclosure includes a resealable lid material and a container body. FIG. 1 is a schematic cross-sectional view of a resealable container according to an embodiment. The resealable container 100 includes a resealable lid material 10 including a base material layer 1, an adhesive layer 2, and a heat-sealing layer 3, and a container body 20. The container body 20 is formed from a paper material 5 having a coating layer 6. When manufacturing the resealable container, the resealable lid material 10 and the container body 20 are heat-sealed at the flange portion 20a of the container body 20, thereby sealing the contents. The shape of the resealable container 100, that is, the shapes of the resealable lid material 10 and the container body 20, can be appropriately adjusted according to the use purpose of the container.

[0011] Examples of the contents stored in the resealable container include, for example, confectionery, yogurt, etc. in the food category, and detergents, wet tissues, etc. in the non-food category.

[0012] FIG. 2 is a schematic cross-sectional view showing an enlarged view of the vicinity of the flange portion at the start of opening of a resealable container according to an embodiment. The resealable lid material 10 and the container body 20 are heat-sealed via the heat-sealing layer 3 at the flange portion 20a of the container body 20. In this state, when the container is opened from the end of the lid material on the right side of the figure in the direction of arrow A1, at the right end of the flange portion in the figure, the heat-sealing layer 3 breaks in the direction of the broken-line arrow, and peeling at the interface between the adhesive layer 2 and the heat-sealing layer 3 progresses, and the adhesive layer 2 is exposed. Thereafter, at the left end of the flange portion, the heat-sealing layer 3 is released from the coating layer 6 of the container body, and then breaks again in the direction of the broken-line arrow, and the exposure of the adhesive layer 2 ends, and the opening of the container begins.

[0013] FIG. 3 is a schematic cross-sectional view showing an enlarged view of the vicinity of the flange portion when the opening of the resealable container according to one embodiment is enlarged. After the opening starts according to FIG. 2, in the direction perpendicular to the plane of FIG. 2, peeling at the interface between the adhesive layer 2 and the heat seal layer 3 proceeds along the flange portion of the container body. That is, when the opening of the resealable container proceeds in the direction of arrow A2 shown in FIG. 3 and the opening of the container expands, peeling at the interface between the adhesive layer 2 and the heat seal layer 3 proceeds in the direction of the broken line arrow in the figure.

[0014] As described above, since the adhesive layer 2 is exposed when the lid material is opened, the container can be resealed by the adhesive layer 2 after opening.

[0015] Consider the proper progress of the opening of the resealable container from the viewpoint of the forces acting between the layers. (A) Start of opening When lifting the lid material from the outside of the container and applying a force to the outer end (outside of the container) of the heat seal portion between the heat seal layer 3 and the coating layer 6, peeling occurs in one of the following modes. · Adhesive layer exposure (proper): The heat seal layer breaks and migrates to the container side, and delamination between the adhesive layer / heat seal layer occurs. · Paper peeling (improper): The coating layer breaks and migrates to the lid material side, and delamination between the coating layer / paper material (paper peeling) occurs. Note that paper peeling means that the coating layer peels off from the paper material together with the surface layer of the paper material. The forces required for peeling in each mode are as follows. · Force required for adhesive layer exposure [N / 15 mm] = Breaking strength a [N / 15 mm] of the heat seal layer + Interlayer peeling strength c [N / 15 mm] between the adhesive layer / heat seal layer (From the viewpoint of the progress of peeling in the proper mode, a + c can be 4 to 12 N / 15 mm, and may be 7 to 9 N / 15 mm.) · Force required for paper peeling [N / 15 mm] = Breaking strength d [N / 15 mm] of the coating layer + Interlayer peeling strength f [N / 15 mm] between the coating layer / paper material (From the perspective of the progress of peeling in the proper mode, d + f can be more than 8 N / 15 mm, and may be 9 N / 15 mm or more, or 12 N / 15 mm or more.)

[0016] (B) Opening start When peeling progresses in the mode of exposing the adhesive layer and a force is applied to the inner (inside the container) end of the heat-sealed portion between the heat-sealing layer 3 and the coating layer 6, peeling occurs in one of the following modes. · Container opening (proper): The heat-sealing layer breaks, and the container opens with the adhesive layer protected by the heat-sealing layer. · Double lid (improper): The heat-sealing layer does not break, and peeling between the adhesive layer / heat-sealing layer progresses, so the container does not open. The forces required for peeling in each mode are as follows. · Force required for container opening [N / 15 mm] = Breaking strength a of the heat-sealing layer [N / 15 mm] (From the perspective of the progress of peeling in the proper mode, a can be 1 to 6 N / 15 mm, and may be 2 to 3 N / 15 mm.) · Force required for double lid [N / 15 mm] = Interlayer peeling strength c between the adhesive layer / heat-sealing layer [N / 15 mm] (From the perspective of the progress of peeling in the proper mode, c can be more than 5 N / 15 mm, and may be 6 N / 15 mm or more, or 7 N / 15 mm or more.)

[0017] (C) Opening expansion After peeling progresses in the mode of exposing the adhesive layer and opening the container, when unsealing progresses along the flange portion to expand the opening, peeling occurs in one of the following modes. · Maintenance of adhesive layer exposure (proper): Interlayer peeling between the adhesive layer / heat-sealing layer progresses while the heat-sealing layer breaks at the flange portion. · Transition to paper peeling (inappropriate): Interlayer peeling (paper peeling) between the coating layer and the paper material occurs while the coating layer breaks at the flange part. Depending on how the force is applied afterwards, interlayer peeling between the adhesive layer / heat seal layer and paper peeling may proceed simultaneously, or only paper peeling may proceed after the heat seal layer and the coating layer break. The force required for peeling in each mode is as follows. · Force required to maintain adhesive layer exposure [N] = Tear strength b [N] of the heat seal layer × 2 + Interlayer peeling strength c [N / 15 mm] between the adhesive layer / heat seal layer × Heat seal width L (flange width) [mm] ÷ 15 (From the perspective of the progression of peeling in the appropriate mode, b×2 + c×L÷15 can be 0.5 to 2.5 N, and may also be 1.5 to 2.0 N.) · Force required to transition to paper peeling [N] = Tear strength e [N] of the coating layer × 2 + Interlayer peeling strength f [N / 15 mm] between the coating layer / paper material × Heat seal width L [mm] ÷ 15 (From the perspective of the progression of peeling in the appropriate mode, e×2 + f×L÷15 can be greater than 1.5 N, and may also be 2 N or more, or 3 N or more.)

[0018] From the above, it can be said that the resealable container according to the present disclosure satisfies the following relationships in each of the above phases. (A) Start of opening: Force required for adhesive layer exposure [N / 15 mm] < Force required for paper peeling [N / 15 mm] (B) Start of opening: Force required for container opening [N / 15 mm] < Force required for the double lid [N / 15 mm] (C) Enlargement of the opening: Force required to maintain adhesive layer exposure [N] < Force required to transition to paper peeling [N]

[0019] <Resealable lid material> Examples of the base material layer include films formed from resins such as polyester (e.g., polyethylene terephthalate (PET)), nylon (NY), polyolefin (e.g., polyethylene (PE)), and ethylene vinyl alcohol (EVOH). The base material layer may be a transparent gas barrier film having any one of an aluminum metal thin film layer, a silicon oxide thin film layer, and an aluminum oxide thin film layer. The base material layer may be a biaxially stretched film. For forming the base material layer, these resins may be used alone or in combination of two or more. When resins are used in combination, the base material layer may be a multilayer coextruded film, or may be a film in which resin films are laminated via an adhesive such as a two-component mixed polyurethane-based adhesive.

[0020] From the viewpoint of strength, the thickness of the base material layer can be 5 μm or more, while from the viewpoint of heat sealability, it can be 50 μm or less. From these viewpoints, the thickness of the base material layer may be 10 μm or more, may be 20 μm or more, may be 40 μm or less, and may be 30 μm or less.

[0021] The base material layer may have a printing layer on the adhesive layer side. The printing layer can be formed using printing ink for films generally used.

[0022] The adhesive layer can be formed from, for example, a rubbery thermoplastic resin. The rubbery thermoplastic resin may be any thermoplastic resin having rubber properties and is not particularly limited. Examples include styrenic thermoplastic resins (styrenic thermoplastic elastomers) such as ethylene-propylene copolymer resin, ethylene-vinyl acetate copolymer resin, styrene-butadiene copolymer resin, and styrene-isoprene copolymer resin. The rubbery thermoplastic resin may be a styrenic thermoplastic resin from the viewpoint that it is difficult for irregularities to occur on the surface of the adhesive layer during peeling from the heat seal layer and it has excellent resealability. The adhesive layer may be formed from a mixture of the above rubbery thermoplastic resin and an adhesion promoter. Examples of the adhesion promoter include resins having adhesiveness composed of natural resins or synthetic resins, such as rosin-based resins, terpene-based resins, petroleum-based resins, and the like. The mixing ratio of the rubbery thermoplastic resin and the adhesion promoter is preferably rubbery thermoplastic resin / adhesion promoter = 60 / 40 to 90 / 10 (weight% ratio).

[0023] From the viewpoint of re-sealability, the thickness of the adhesive layer can be 2 μm or more, while from the viewpoint of heat sealability, it can be 50 μm or less. From these viewpoints, the thickness of the adhesive layer may be 5 μm or more, may be 10 μm or more, may be 40 μm or less, and may be 30 μm or less.

[0024] The heat seal layer contains a heat seal resin having a sea-island structure in which an island phase containing a resin having a melting peak temperature of 115 to 120 °C by DSC analysis is dispersed in a sea phase containing a polyethylene resin. By configuring the heat seal layer with such a heat seal resin, the breakage of the heat seal layer described above can be appropriately caused.

[0025] Examples of the polyethylene resin constituting the sea phase include high-density polyethylene (HDPE), low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), ultra-low density polyethylene (VLDPE), and the like. Among these, from the viewpoints of processability and heat sealability, low-density polyethylene is preferred as the polyethylene resin.

[0026] From the viewpoint of the ease of breakage of the heat seal layer, the melting peak temperature (melting point) of the resin constituting the island phase is 115 °C or higher, while from the viewpoint of heat seal strength, it is 120 °C or lower. From these viewpoints, the melting peak temperature may be 116 °C or higher, and may be 118 °C or higher. Such a resin is not particularly limited, but a polyamide-based resin is preferred from the viewpoint of low compatibility with the polyethylene resin contained in the sea phase. The melting peak temperature by DSC analysis (differential scanning calorimetry) can be measured in accordance with JIS-K7121. When performing DSC analysis on the heat-sealing layer, since the peaks of the marine polyethylene resin and the resin of the island phase appear overlapping during the 2nd-run (second heating), the peak temperature is determined according to the same JIS standard.

[0027] From the perspective of the ease of breakage of the heat-sealing layer, the amount of the island phase in the sea-island structure can be 3% by mass or more based on the total amount of the sea-island structure (or the total amount of the heat-sealing resin). On the other hand, from the perspective of heat-sealing strength, it can be 45% by mass or less based on the total amount of the sea-island structure. From these perspectives, the amount of the island phase may be 5% by mass or more, may be 10% by mass or more, may be 35% by mass or less, and may be 25% by mass or less.

[0028] The difference between the melting start temperature and the melting end temperature of the heat-sealing resin by DSC analysis is preferably 20°C or more. Resins with a broad melting peak by DSC analysis have low crystallinity and tend to start melting even at low temperatures. Therefore, heat-sealing becomes easier even for those containing different resins. From this perspective, the difference may be 30°C or more. The upper limit of the difference is not particularly limited, but it can be set to 35°C from the perspective that if there is too much difference in melting temperature during film-forming processing, film-forming becomes difficult.

[0029] From the perspective of heat-sealing strength, the thickness of the heat-sealing layer can be 5 μm or more, while from the perspective of cost, it can be 25 μm or less. From these perspectives, the thickness of the heat-sealing layer may be 7 μm or more, may be 10 μm or more, may be 23 μm or less, and may be 20 μm or less.

[0030] From the perspective of transport resistance, the thickness of the entire resealable lid material can be 50 μm or more, while from the perspectives of heat-sealing property and cost, it can be 100 μm or less. From these perspectives, the thickness of the entire resealable lid material may be 60 μm or more, may be 70 μm or more, may be 90 μm or less, and may be 80 μm or less.

[0031] <Container body> The paper material is not particularly limited as long as it is made of paper. Here, the paper refers to a material containing plant-derived pulp as the main component, specifically, a material containing 50% by mass or more of plant-derived pulp. Specific examples of the paper material include high-quality paper, special high-quality paper, coated paper, art paper, cast-coated paper, imitation paper, kraft paper, and glassine paper.

[0032] From the perspective of physical strength, the thickness of the paper material can be 200 μm or more, while from the perspective of cost, it can be 800 μm or less. From these perspectives, the thickness of the paper material may be 250 μm or more, may be 300 μm or more, may be 650 μm or less, or may be 500 μm or less.

[0033] The coating layer contains low-density polyethylene (LDPE) resin. Thereby, physical properties such as heat sealability, tear resistance, water / oil resistance, etc. can be imparted to the paper material. Examples of the LDPE resin include polyethylene resins with a density of 0.910 - 0.925 g / cm 3 . Coating of the paper material with LDPE resin can be performed using, for example, an extruder or the like.

[0034] From the perspective of tear resistance and adhesion to paper, the thickness of the coating layer is 15 μm or more, while from the perspective of heat sealability, it can be 45 μm or less. From these perspectives, the thickness of the coating layer may be 20 μm or more, may be 25 μm or more, may be 40 μm or less, or may be 35 μm or less.

[0035] The width of the flange portion can be substantially said to be the heat seal width between the heat seal layer and the coating layer. The width of the flange portion can be adjusted according to the shape of the flange portion. The width of the flange portion can be 2 mm or more from the viewpoint of sealing performance, while it can be 10 mm or less from the viewpoint of the efficiency of the sealing process. From these viewpoints, the width of the flange portion may be 4 mm or more, may be 6 mm or more, may be 9 mm or less, and may be 8 mm or less.

[0036] The sealing of the resealable container can be carried out, for example, using a heat sealer under the conditions of 160 °C, 0.4 MPa, 1 sec, and heat seal width = flange width, by performing heat sealing between the heat seal layer and the coating layer in the flange portion.

Examples

[0037] The present disclosure will be described in more detail by the following examples, but the present invention is not limited to these examples.

[0038] <Preparation of the lid material> A lid material having the following layer structure (the thickness is shown in parentheses) was prepared. The base material layer was a multilayer coextruded film, and a styrene-based thermoplastic elastomer was used for the adhesive layer. Lid material I: PET (12 μm) / EVOH (10 μm) / NY (25 μm) / adhesive layer (10 μm) / heat seal layer i (15 μm) Lid material II: PET (12 μm) / PE (15 μm) / adhesive layer (30 μm) / heat seal layer ii (15 μm) Lid material III: PET (12 μm) / PE (15 μm) / adhesive layer (30 μm) / heat seal layer iii (15 μm)

[0039] Details of the heat seal layer are as follows. Heat seal layer i: It contains a heat seal resin having a sea-island structure in which an island phase of a polyamide resin with a melting peak temperature of 115 °C is dispersed in a PE sea phase. The melting start temperature of the heat seal resin by DSC analysis was 96 °C, and the melting end temperature was 122 °C. Heat-sealing layer ii: It contains a heat-sealing resin having a sea-island structure in which a polyamide resin with a melting peak temperature of 118 °C is dispersed in a sea phase of PE. The melting start temperature of the heat-sealing resin by DSC analysis was 95 °C, and the melting end temperature was 124 °C. Heat-sealing layer iii: It contains a single phase of PE as the heat-sealing resin. The melting start temperature of the heat-sealing resin by DSC analysis was 94 °C, and the melting end temperature was 107 °C.

[0040] <Preparation of paper containers> The following paper containers (container bodies) were prepared. Paper container I: A paper container having a coating layer with a thickness of 39 μm containing LDPE resin on the surface of a paper material made of paper with a thickness of 400 μm (heat-sealing width 4 mm) Paper container II: A paper container having a coating layer with a thickness of 19 μm containing LDPE resin on the surface of a paper material made of paper with a thickness of 400 μm (heat-sealing width 4 mm) Paper container III: A paper container having a coating layer with a thickness of 13 μm containing LDPE resin on the surface of a paper material made of paper with a thickness of 400 μm (heat-sealing width 4 mm)

[0041] <Measurement of various strengths> Various strengths related to the lid material and the paper container were measured. The results are shown in Table 1. a: Tensile strength at break of the heat-sealing layer of the lid material [N / 15 mm] The layer between the adhesive layer / heat-sealing layer was peeled off, and the tensile strength at break of the heat-sealing layer alone was measured. b: Tear strength of the heat-sealing layer of the lid material [N] The layer between the adhesive layer / heat-sealing layer was peeled off, and the tear strength of the heat-sealing layer alone was measured. c: Interlayer peeling strength of the adhesive layer / heat-sealing layer of the lid material [N / 15 mm] A measurement laminate (PET film / PE film) was prepared, and the heat-sealing layer side of the lid material was opposed to the PE film side of the measurement laminate and heat-sealed. Then, the lid material and the measurement laminate were pulled in the laminating direction so as to be peeled off, and the peeling strength after the heat-sealing layer was broken and the interlayer peeling of the adhesive layer / heat-sealing layer occurred was measured. d: Tensile strength at break of the coating layer of the paper container [N / 15 mm] The coating layer / paper material interface was peeled, and the tensile strength at break of the coating layer (with the surface layer of the paper material attached) was measured. e: Tear strength of the coating layer of the paper container [N] The coating layer / paper material interface was peeled, and the tear strength of the coating layer (with the surface layer of the paper material attached) was measured. f: Peel strength between the coating layer and the paper material of the paper container [N / 15 mm] A measurement laminate (PET film / PE film) was prepared, and the PE film side of the paper container and the measurement laminate were heat-sealed facing each other. Then, the paper container and the measurement laminate were pulled in the laminating direction to peel them, and the peel strength after the coating layer broke and the interface between the coating layer and the paper material (more precisely, the peeling of the surface layer of the paper material) occurred was measured.

[0042] The above strength measurements were carried out as follows respectively. Measurement of tensile strength at break: Measured in accordance with JIS Z1707 at a tensile speed of 200 mm / min. Measurement of tear strength: Measured in accordance with the trouser method based on JIS Z1728 at a tensile speed of 200 mm / min. Measurement of peel strength between layers: Measured by T-peel described in JIS K6854-3 at a tensile speed of 300 mm / min.

[0043]

Table 1

[0044] <Fabrication of a paper container with a lid> According to the combination described in Table 2, a paper container with a lid was fabricated using a lid material and a paper container. Heat sealing was performed between the lid material and the flange portion of the paper container through a heat-sealing layer. The heat-sealing conditions were 160 °C, 0.4 MPa, 1 sec, and heat-sealing width = flange width.

[0045] <Re-sealability evaluation> The relationship between the strength and the peeling mode at each stage of opening was observed when the lid material was peeled off by hand from the fabricated paper container with a lid material, and the evaluation was carried out according to the following criteria. The results are shown in Table 2. (A) Start of opening: It was evaluated as ○ if the adhesive layer was exposed and × if the paper peeled off. (B) Start of opening: It was evaluated as ○ if the container opened and × if it became a double lid. Those with paper peeling at the start of opening were excluded from the evaluation. (C) Enlargement of opening: It was evaluated as ○ if the exposure of the adhesive layer was maintained and × if it shifted to paper peeling. Those with paper peeling at the start of opening were excluded from the evaluation.

[0046] The behavior when the lid material was pressed against the position before opening of the container with a finger after opening was observed, and the presence or absence of the resealing function was evaluated according to the following criteria. The results are shown in Table 2. Resealing function: It was evaluated as ○ if the paper container was resealed by the adhesive layer over the entire flange part and × if not.

[0047]

Table 2

[0048] In the examples, the opening proceeded with the adhesive layer exposed from the start of opening to the enlargement of opening, and finally the resealing function was exhibited. When the relationship between the strengths at each stage was confirmed, in the examples, F(A1) < F(A2), F(B1) < F(B2), and F(C1) < F(C2). In Comparative Example 1, the adhesive layer was exposed from the start of opening to the start of opening, but when the opening was enlarged, the coating layer of the paper container was broken and shifted to paper peeling. When the relationship between the strengths at each stage was confirmed, in Comparative Example 1, F(A1) < F(A2), F(B1) < F(B2), and F(C1) > F(C2). In Comparative Examples 2 and 3, the coating layer of the paper container was broken and paper peeled off from the start of opening. When the relationship between the strengths at each stage was confirmed, in Comparative Examples 2 and 3, F(A1) > F(A2), F(B1) < F(B2), and F(C1) > F(C2).

Explanation of symbols

[0049] 1…Base material layer, 2…Adhesive layer, 3…Heat-sealing layer, 5…Paper material, 6…Coating layer, 10…Resealable lid material, 20…Container body, 20a…Flange portion, 100…Resealable container.

Claims

Claim 1 A resealable container comprising a resealable lid material and a container body, wherein the resealable lid material comprises a base material layer, an adhesive layer, and a heat-sealing layer, the heat-sealing layer comprising a heat-sealing resin having a sea-island structure in which an island phase containing a resin having a melting peak temperature of 115 to 120 °C by DSC analysis is dispersed in a sea phase containing a polyethylene resin, the container body being formed from a paper material having a coating layer with a thickness of 15 μm or more containing a low-density polyethylene resin, a resealable container, wherein the heat-sealing layer and the coating layer at the flange portion of the container body are heat-sealed. Claim 2 The resealable container according to claim 1, wherein the difference between the melting start temperature and the melting end temperature of the heat-sealing resin by DSC analysis is 20 °C or more. Claim 3 The resealable container according to claim 1 or 2, wherein the resin having a melting peak temperature of 115 to 120 °C by DSC analysis contains a polyamide-based resin. Claim 4 The resealable container according to claim 1 or 2, wherein the adhesive layer contains a styrene-based thermoplastic elastomer.

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