Lids and packaging containers

Abstract

To provide a lid material and packaging container that allows for proper opening of the opening hole upon opening, is suitable for food use, and is easy to open. [Solution] The lid material is capable of closing the opening of a container body having an opening and a flange by being sealed by the flange, and comprises a base layer, an intermediate layer laminated on one side of the base layer, a resin layer laminated peelably from the intermediate layer, and a sealant layer laminated on the resin layer, and a half-cut is formed that extends from the sealant layer to partway up the intermediate layer so as to surround a predetermined area of ​​the lid material, the interlayer strength between the intermediate layer and the resin layer is 0.1 N / 15 mm or more and 1 N / 15 mm or less, and the Young's modulus of the intermediate layer is 1.5 GPa or more.

Description

Technical Field

[0001] The present invention relates to a lid material and a packaging container formed by sealing the lid material to a container body.

Background Art

[0002] In packaging containers for beverages and the like, those in which a film lid material is sealed to the opening of a cup-shaped container body are known. Such a packaging container can be used by piercing a straw through the lid material to drink, but in recent years, there has been an increasing need to drink directly from the packaging container without using a straw from the perspective of reducing environmental impact. Therefore, a packaging container in which an opening hole serving as a drinking mouth is formed in a part of the lid material by peeling off the film lid material has been studied.

[0003] Such a lid material that forms an opening hole when opened has a multilayer structure such as a base material layer / intermediate layer / sealant layer, and the base material layer and the intermediate layer are laminated so as to be easily adhered and configured to be peelable. In addition, a half cut is formed from the sealant layer to the middle of the intermediate layer so as to surround a predetermined area. Within the predetermined area, the base material layer and the intermediate layer do not peel off, and the entire layers of the base material layer, the intermediate layer, and the sealant layer are removed, so that an opening hole can be formed (Patent Documents 1 to 3).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0005] In lid materials with a multilayer structure, adhesive may be used between the layers. However, since the adhesive is exposed from the cut surface of the half-cut, it is undesirable for food applications to use adhesive on the sealant layer side of the intermediate layer through which the half-cut passes. In addition, depending on the material and layer configuration of each layer, the sealant layer may stretch along the half-cut when opened, and the opening may not be formed properly. Furthermore, opening requires separating the base layer and the intermediate layer, and the ease of this separation (ease of opening) also needed to be considered.

[0006] This invention has been made in view of the above problems, and aims to provide a lid material and packaging container that can be opened in a normal manner, have an opening hole formed when opened, can be used for food applications, and are easy to open. [Means for solving the problem]

[0007] One aspect of the present invention for solving the above problems is a lid material that can close the opening of a container body having an opening and a flange by being sealed by the flange, comprising a base layer, an intermediate layer laminated on one side of the base layer, a resin layer laminated peelably from the intermediate layer, and a sealant layer laminated on the resin layer, wherein a half-cut is formed that surrounds a predetermined area of ​​the lid material, extending from the sealant layer to partway up the intermediate layer, the interlayer strength between the intermediate layer and the resin layer is 0.1 N / 15 mm or more and 1 N / 15 mm or less, and the Young's modulus of the intermediate layer is 1.5 GPa or more.

[0008] Another aspect of the present invention is a packaging container comprising a lid and a container body. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide a lid material and packaging container that have an opening that is properly formed when opened, can be used for food applications, and is easy to open. [Brief explanation of the drawing]

[0010] [Figure 1] Schematic plan view of a packaging container according to an embodiment. [Figure 2] Schematic front view of a packaging container according to an embodiment. [Figure 3] Schematic plan view of the packaging container after opening. [Figure 4] Partial cross-section along line A-A' in Figure 3 [Figure 5] Cross-sectional view of the lid material before opening. [Figure 6] Cross-sectional view of the lid material showing its state after opening. [Figure 7] Cross-sectional view of the lid material in the example. [Modes for carrying out the invention]

[0011] <Embodiment> Figure 1 is a schematic plan view of the packaging container according to the embodiment, and Figure 2 is a schematic front view of the packaging container according to the embodiment. Figure 3 is a schematic plan view of the packaging container after opening, and Figure 4 is a partial cross-section along the line A-A' in Figure 3. Figure 5 is a cross-sectional view of the lid material before opening.

[0012] [composition] The packaging container 100 comprises a lid 1 and a container body 2. The packaging container 100 is, for example, a cup-shaped beverage container that allows direct consumption without the use of a straw. When the packaging container 100 is opened, the lid 1 can be partially separated from the container body 2, and an opening 7 that serves as a drinking spout is formed in the portion of the lid 1 remaining on the container body 2 (Figures 3 and 4).

[0013] (lid material) The lid material 1 is a multilayer film comprising a closing portion 3 and a pull tab 4 provided on the outer peripheral edge of the closing portion 3. The closing portion 3 is sealed with the flange 22 of the container body 2 in a region a predetermined distance inward from the outer peripheral edge, thereby closing the opening 21 of the container body 2. The pull tab 4 is a member for gripping when peeling the lid material 1 from the packaging container 100, and is provided on the outer peripheral edge of the closing portion 3. The shape of the pull tab 4 is not particularly limited as long as it is a shape that is easy to grip when opening.

[0014] The lid material 1 is composed of a film in which a base material layer 11, an intermediate layer 12 laminated on one surface of the base material layer 11, a resin layer 13 laminated on the intermediate layer 12 in a peelable manner, and a sealant layer 14 laminated on the resin layer 13 are laminated in this order. As shown in Fig. 5, the lid material 1 is provided with a half cut 6 that reaches from the sealant layer 14 to the middle of the intermediate layer 12. Further, the base material layer 11 and the intermediate layer 12 may be adhered via an adhesive 15.

[0015] The base material layer 11 is the base material of the lid material 1. As the base material layer 11, for example, polyethylene terephthalate (PET) can be used, and the thickness can be 9μm to 50μm. Further, other layers such as a printing layer may be appropriately laminated on the base material layer 11.

[0016] The intermediate layer 12 is laminated on one surface of the base material layer 11 via an adhesive 15. A half cut 6 is formed in the intermediate layer 12 to such an extent that it does not penetrate, and the intermediate layer 12 is peeled off and separated from the container body 2 side together with the base material layer 11 when the lid material 1 is opened.

[0017] The Young's modulus of the intermediate layer 12 is 1.5 GPa or more. When the Young's modulus is less than 1.5 GPa, due to the flexibility of the intermediate layer 12, the cut-off of the break of the half cut 6 of the layers remaining on the container body 2 side (resin layer 13 and sealant layer 14) at the time of opening becomes poor, and the resin layer 13 and the sealant layer 14 may extend along the half cut 6, and the opening hole 7 may not be formed normally. Further, if the Young's modulus becomes too large, the rigidity of the intermediate layer 12 becomes high, and the break of the half cut 6 may become difficult. Therefore, for example, the Young's modulus can be 5.0 GPa or less. As the intermediate layer 12, for example, films such as stretched polypropylene (OPP), heat-seal stretched polypropylene (heat-seal OPP), stretched nylon (ONY), polybutylene terephthalate (PBT), polyethylene terephthalate (PET), and heat-seal polyethylene terephthalate (HSPET) can be used.

[0018] The resin layer 13 is a layer that remains in the opening 21 of the container body 2 after the base layer 11 and the intermediate layer 12 have been peeled off, forming the opening hole 7. For example, polyethylene (PE) can be used as the resin layer 13, and its thickness can be 10 μm to 30 μm. The resin layer 13 can be peeled off from the intermediate layer 12, and in this case, the interlayer strength between the resin layer 13 and the intermediate layer 12 is preferably 0.1 N / 15 mm or more and 1 N / 15 mm or less, and more preferably 0.1 N / 15 mm or more and 0.8 N / 15 mm or less. If the interlayer strength between the resin layer 13 and the intermediate layer 12 is less than 0.1 N / 15 mm, unintended delamination may occur during transportation of the packaging container 100. Also, if the interlayer strength between the resin layer 13 and the intermediate layer 12 exceeds 1 N / 15 mm, the force required to open the packaging container 100 will be large, making it difficult to open. The resin layer 13 can be formed, for example, by extrusion lamination. The lamination speed can be adjusted to increase interlayer strength by slowing it down, and to decrease interlayer strength by increasing it.

[0019] The sealant layer 14 is welded to the flange 22 of the container body 2 and remains with the resin layer 13 after the base layer 11 and intermediate layer 12 are peeled off, forming the opening 7. The material of the sealant layer 14 must be a material that can be welded to the flange 22, and for example, linear low-density polyethylene (LLDPE) or unoriented polypropylene (CPP) can be used. The thickness of the sealant layer 14 can be 20 μm to 70 μm.

[0020] (Half cut) The half-cut 6 is an annular line formed by a cut that extends from the sealant layer 14 to partway through the intermediate layer 12. The half-cut 6 is preferably provided in the area that is inside the flange 22 of the lid material 1 when the lid material 1 is sealed to the container body 2. The configuration of the half-cut 6 is not particularly limited, but for example it may be composed of a straight cut or a series of dot-shaped cuts arranged in a line.

[0021] When the lid material 1 is peeled away from the container body 2, the resin layer 13 and sealant layer 14 in the area inside the half-cut 6 of the lid material 1 are separated from the lid material 1 together with the base material layer 11, but the resin layer 13 and sealant layer 14 in the area outside the half-cut 6 remain on the container body 2 side. As a result, an opening hole 7 along the outer diameter of the half-cut 6 is formed in the lid material 1 (resin layer 13 and sealant layer 14). The shape of the half-cut 6 is formed to surround a predetermined area of ​​the lid material and is not particularly limited as long as it is a shape suitable for drinking from, but for example it can be circular, oval, teardrop-shaped, etc.

[0022] (Container body) The container body 2 has an opening 21, and a flange 22 is provided around the periphery of the opening 21. In Figure 1, the opening 21 of the container body 2 is shown as a circle, but it may have other shapes.

[0023] [Effects / Effects] To open the packaging container 100 according to this embodiment, the lid material 1 is peeled off from the container body 2, starting from the pull tab 4. At this time, delamination occurs between the base material layer 11 and the resin layer 13 of the lid material 1, but because an annular half-cut 6 is formed in the direction of delamination (from the pull tab 4 toward the center of the closure part 3), delamination does not occur in the region inside the half-cut 6. As a result, the resin layer 13 and the sealant layer 14 in the region inside the half-cut 6 are separated from the lid material 1 together with the base material layer 11 and the intermediate layer 12, and an opening hole 7 can be formed in the lid material 1 (Figures 4 and 6).

[0024] Furthermore, since the Young's modulus of the intermediate layer 12 is 1.5 GPa or higher, when the half-cut 6 is broken during opening, the stretching of the resin layer 13 and the sealant layer 14 along the half-cut 6 can be suppressed, and the opening hole 7 can be formed normally.

[0025] On the other hand, if a layer with a Young's modulus of less than 1.5 GPa (for example, a CPP layer) is used as the intermediate layer 12, in the layer configuration of the present invention as shown in Figure 5, when the half-cut 6 breaks, the resin layer 13 and the sealant layer 14 may stretch along the half-cut 6, and there is a risk that the opening hole 7 cannot be formed properly.

[0026] However, even if the Young's modulus of the intermediate layer 12 is less than 1.5 GPa, there are methods to suppress the elongation of the resin layer 13 and the sealant layer 14. For example, as shown in the reference example in Figure 7, by providing a stretched PET layer 17 on the inner side of the intermediate layer 12, the suitability for half-cut processing is improved, and the opening hole 7 can be formed normally. However, when providing a stretched PET layer 17, it is necessary to use an anchor coating agent 18 or adhesive 19 as appropriate to improve the adhesion between the stretched PET layer 17 and the resin layer 13, and between the stretched PET layer 17 and the sealant layer 14. Since a half-cut 6 is formed on the inner side of the intermediate layer 12, the adhesive is exposed from the cross-section of the half-cut 6, which is undesirable for food applications.

[0027] However, in the lid material 1 of this embodiment, by defining the Young's modulus of the intermediate layer 12, the elongation of the resin layer 13 and the sealant layer 14 when the half-cut 6 breaks can be suppressed, so there is no need to separately provide a stretched PET layer 17 as shown in Figure 7. As a result, the half-cut 6 can be configured so that adhesive and anchor coating agent do not pass through it, and the adhesive does not become exposed from the cut surface of the half-cut 6 (Figure 5). For this reason, the lid material 1 and packaging container 100 of this embodiment can be used for food applications.

[0028] As described above, the lid material 1 according to this embodiment is composed of a film in which a base layer 11, an intermediate layer 12 laminated on one side of the base layer 11, a resin layer 13 that is peelably laminated with the intermediate layer 12, and a sealant layer 14 laminated on the resin layer 13 are sequentially laminated. A half-cut 6 is provided that extends from the sealant layer 14 to partway up the intermediate layer 12, and furthermore, the Young's modulus of the intermediate layer 12 is 1.5 GPa or higher. As a result, the elongation of the resin layer 13 and the sealant layer 14 when the half-cut 6 is broken can be suppressed without providing a layer (such as a stretched PET layer) on the inner side of the intermediate layer 12 to improve the suitability for half-cut processing, and the opening hole 7 can be formed normally. Furthermore, since there is no need to provide a stretched PET layer or the like on the inner side of the intermediate layer 12, there is no need to use an anchor coating agent 18 or adhesive 19 on the inner side of the intermediate layer 12, and these materials are not exposed from the cross-section of the half-cut 6. For this reason, the lid material 1 can be used as a lid material for food packaging containers.

[0029] Furthermore, the interlayer strength between the resin layer 13 and the intermediate layer 12 is between 0.1 N / 15 mm and 1 N / 15 mm. This prevents unintended delamination from occurring during the transportation of the packaging container 100, and also facilitates opening (separation of the resin layer 13 and the intermediate layer 12). [Examples]

[0030] (Example 1) A lid material was fabricated with a layer structure of PET12 / adhesive / OPP40 / / extruded PE15 / LLDPE30 (Figure 5), and a half-cut 6 was formed that extended from the sealant layer (LDPE layer) to partway through the intermediate layer (OPP layer). The lamination speed of the extruded PE was set to standard (180 m / min). In the above layer structure, the numbers appended to the end of each material indicate the thickness of the layer, and the unit is μm. The areas indicated by " / / " are areas where the lid material has been peeled off.

[0031] (Example 2) The lid material was prepared in the same manner as in Example 1, except that a half-cut 6 was formed, extending from the sealant layer (LLDPE layer) to partway through the intermediate layer (HSOPP layer), with a layer structure of PET12 / adhesive / HSOPP40 / / extruded PE15 / LDPE30 (Figure 5).

[0032] (Example 3) The lid material was prepared in the same manner as in Example 1, except that a half-cut 6 was formed, extending from the sealant layer (CPP layer) to partway through the intermediate layer (HSOPP layer), with a layer structure of PET12 / adhesive / HSOPP40 / / extruded PE15 / CPP30 (Figure 5).

[0033] (Example 4) The lid material was prepared in the same manner as in Example 1, except that a half-cut 6 was formed, extending from the sealant layer (LLDPE layer) to partway through the intermediate layer (ONY layer), with a layer structure of PET12 / adhesive / ONY25 / extruded PE15 / LLDPE30 (Figure 5).

[0034] (Example 5) The lid material was prepared in the same manner as in Example 1, except that a half-cut 6 was formed, extending from the sealant layer (CPP layer) to partway through the intermediate layer (ONY layer), with a layer structure of PET12 / adhesive / ONY25 / extruded PE15 / CPP30 (Figure 5).

[0035] (Example 6) The lid material was prepared in the same manner as in Example 1, except that a half-cut 6 was formed, extending from the sealant layer (LLDPE layer) to partway through the intermediate layer (PBT layer), with a layer structure of PET12 / adhesive / PBT25 / extruded PE15 / LLDPE30 (Figure 5).

[0036] (Example 7) The lid material was fabricated in the same manner as in Example 1, except that a half-cut 6 was formed, extending from the sealant layer (CPP layer) to partway through the intermediate layer (PBT layer), with a layer structure of PET12 / adhesive / PBT25 / extruded PE15 / CPP30 (Figure 5).

[0037] (Example 8) The lid material was fabricated in the same manner as in Example 1, except that a half-cut 6 was formed, extending from the sealant layer (LLDPE layer) to partway through the intermediate layer (PET layer), with a layer structure of PET12 / adhesive / PET25 / extruded PE15 / LLDPE30 (Figure 5).

[0038] (Example 9) The lid material was fabricated in the same manner as in Example 1, except that it had a layer structure of PET12 / adhesive / PET25 / extruded PE15 / CPP30 (Figure 5) and a half-cut 6 was formed that extended from the sealant layer (CPP layer) to partway through the intermediate layer (PET layer).

[0039] (Example 10) A lid material 1 was manufactured in the same manner as in Example 1, except that it had a layer structure of PET12 / adhesive / PET25 / extruded PE15 / CPP30 (Figure 5), a half-cut 6 was formed that reached from the sealant layer (CPP layer) to the middle of the intermediate layer (PET layer), and the lamination speed of the extruded PE was set to high (250 m / min).

[0040] (Example 11) The lid material was fabricated in the same manner as in Example 1, except that a half-cut 6 was formed, extending from the sealant layer (LLDPE layer) to partway through the intermediate layer (HSPET layer), with a layer structure of PET12 / adhesive / HSPET20 / extruded PE15 / LLDPE30 (Figure 5).

[0041] (Comparative Example 1) The lid material was prepared in the same manner as in Example 1, except that it had a layer structure of PET12 / adhesive / PET25 / extruded PE15 / CPP30 (Figure 5), a half-cut 6 was formed that reached from the sealant layer (CPP layer) to the middle of the intermediate layer (PET layer), and the lamination speed of the extruded PE was set to a low speed (100 m / min).

[0042] (Comparative Example 2) The lid material was prepared in the same manner as in Example 1, except that a half-cut 6 was formed, extending from the sealant layer (CPP layer) to partway through the intermediate layer (CPP layer), with a layer structure of PET12 / adhesive / CPP50 / extruded PE15 / anchor coating agent / PET12 / adhesive / CPP30 (Figure 7).

[0043] (Comparative Example 3) The lid material was prepared in the same manner as in Example 1, except that a half-cut 6 was formed, extending from the sealant layer (LLDPE layer) to partway through the intermediate layer (CPP layer), with a layer structure of PET12 / adhesive / CPP50 / extruded PE15 / LLDPE30 (Figure 5).

[0044] (Comparative Example 4) The lid material was fabricated in the same manner as in Example 1, except that a half-cut 6 was formed, extending from the sealant layer (CPP layer) to partway through the intermediate layer (CPP layer), with a layer structure of PET12 / adhesive / CPP50 / / extruded PE15 / CPP30 (Figure 5).

[0045] The lid material 1 prepared in Examples 1 to 11 and Comparative Examples 1 to 4 was attached to the flange of a container body containing 100 mL of water by heat sealing (185°C, 1.25 s, 0.4 MPa) to create a packaging container.

[0046] [Interlaminar strength measurement] The raw lid material for Examples 1-11 and Comparative Examples 1-4 was cut into 15mm widths, and the interlayer strength (peel strength) at the easily peelable area (between the intermediate layer and the resin layer) was measured for each.

[0047] [Young's modulus measurement] For the lid materials of Examples 1 to 11 and Comparative Examples 1 to 4, the Young's modulus of the intermediate layer 12 was measured in accordance with JIS K 7127.

[0048] [Evaluation of opening formation] Twenty packaging containers each from Examples 1-11 and Comparative Examples 1-4 were opened. For each packaging container, it was checked whether the opening hole was properly formed and evaluated according to the following criteria. ○: There were 20 packaging containers with properly formed openings. ×: The number of packaging containers with properly formed openings was 19 or less.

[0049] [Unboxing Impression Evaluation] Twenty monitors were asked to open the packaging containers of Examples 1-11 and Comparative Examples 1-4, and their ease of opening was evaluated. The evaluation was conducted according to the following criteria, based on the number of people who answered that "the opening was good (no force was required to open the packaging container, and the lid material was easy to peel off)." ○: 18 or more people △: More than 15 people and less than 17 people ×: 14 people or less

[0050] [Food-compatible suitability evaluation] The lid materials for Examples 1-11 and Comparative Examples 1-4 were evaluated according to the following criteria to determine whether they could be used for food applications. ○: No adhesive or anchor coating agent is exposed from the cross-section of the half-cut. ×: Adhesive or anchor coating is exposed from the half-cut surface.

[0051] Table 1 shows the extrusion lamination speed of the lid material for Examples 1 to 11 and Comparative Examples 1 to 4, the peel strength at the peeling point, the Young's modulus of the intermediate layer, the evaluation results of the opening hole formation evaluation and the number of packaging containers in which the opening holes were formed normally, the evaluation results of the opening feel evaluation and the number of people who answered that the opening feel was good, and the evaluation results of the suitability for food use.

[0052] [Table 1]

[0053] In all of the packaging containers in Examples 1 to 11, the interlayer strength at the delamination point (between the resin layer and the intermediate layer) was in the range of 0.1 N / 15 mm to 1 N / 15 mm. Therefore, the results of the openability evaluation were also good. In particular, the interlayer strength was 80 N / m 2In Examples 1-3 and 6-11, the products could be opened with minimal force, and all participants reported a positive experience with the opening process.

[0054] Furthermore, the Young's modulus of the intermediate layer in all of the packaging containers in Examples 1 to 11 was 1.5 GPa or higher. As a result, no elongation occurred in the resin layer and sealant layer when the packaging containers were opened, and the opening holes were formed normally.

[0055] Furthermore, in all of the packaging containers of Examples 1 to 11, the adhesive did not pass through the half-cuts formed on the lid material, and no adhesive was exposed from the cross-section of the half-cuts. Therefore, all of these packaging containers were suitable for food use.

[0056] The packaging container of Comparative Example 1 had a Young's modulus of 1.5 GPa or higher in the intermediate layer, allowing for the formation of an opening hole normally, similar to the example. Furthermore, no adhesive was exposed from the cross-section of the half-cut lid material, making it suitable for food applications. On the other hand, the packaging container of Comparative Example 1 had an interlayer strength exceeding 1 N / 15 mm, requiring force to open, and half of the monitors felt that the opening process was poor.

[0057] The packaging container in Comparative Example 2 had an interlayer strength of 0.1 N / 15 mm to 1 N / 15 mm at the delamination point (between the resin layer and the intermediate layer), and therefore, similar to the example, the results of the openability evaluation were good. Furthermore, despite having a Young's modulus of less than 1.5 GPa, it was possible to form an opening hole normally. This is presumed to be due to the improved suitability for half-cut processing because a stretched PET layer was provided on the inner side of the intermediate layer. However, because the stretched PET layer was provided, the anchor coating agent and adhesive were used on the inside of the intermediate layer, and the adhesive was exposed from the cross-section of the half-cut lid material, making it unsuitable for food applications.

[0058] The packaging containers of Comparative Examples 3 and 4 had interlayer strengths in the delamination area (between the resin layer and the intermediate layer) in the range of 0.1 N / 15 mm to 1 N / 15 mm, and therefore, similar to the Examples, the results of the openability evaluation were good. In addition, no adhesive was exposed from the cross-section of the half-cut lid material, making them suitable for food applications. On the other hand, the Young's modulus of the intermediate layer was less than 1.5 GPa, and no layer was provided to improve suitability for half-cut processing as in Comparative Example 2. As a result, when the half-cut was broken, the resin layer and sealant layer stretched, and in some cases, the opening could not be formed properly. [Industrial applicability]

[0059] The present invention can be used as a packaging container in which a lid material is sealed to the container body and an opening is formed when opened, or as a lid material used for said packaging container. [Explanation of Symbols]

[0060] 1: Lid material 2: Container body 6: Half cut 7: Opening hole 11: Base material layer 12: Middle Class 13: Resin layer 14: Sealant layer 15: Adhesive 19: Adhesive 21 :Aperture 22: Flange 100: Packaging container

Claims

1. A lid material that can close the opening of a container body having an opening and a flange by being sealed by the flange, A base layer and An intermediate layer laminated on one side of the base material layer, The intermediate layer and a resin layer that is peelably laminated together, The resin layer comprises a sealant layer laminated on the resin layer, A half-cut is formed in the lid material, extending from the sealant layer to partway up the intermediate layer, so as to surround a predetermined area of ​​the lid material. The interlayer strength between the intermediate layer and the resin layer is 0.1 N / 15 mm or more and 1 N / 15 mm or less. A lid material having a Young's modulus of 1.5 GPa or more in the intermediate layer.

2. The lid material according to claim 1, wherein the interlayer strength between the intermediate layer and the resin layer is 0.1 N / 15 mm or more and 0.8 N / 15 mm or less.

3. The lid material according to claim 1, wherein no adhesive is used between the sealant layer and the intermediate layer.

4. The lid material according to claim 1, wherein the intermediate layer is one of stretched polypropylene film, heat-sealed stretched polypropylene film, stretched nylon film, polybutylene terephthalate film, polyethylene terephthalate film, and heat-sealed polyethylene terephthalate film.

5. A packaging container comprising a lid material according to any one of claims 1 to 4 and the container body.

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