Film, lid, container with content and method for manufacturing lid

Abstract

To provide a film through which a straw can be easily inserted and which allows internal pressure adjustment, a lid, a container with contents, and a method for manufacturing a lid.SOLUTION: A film 3 is a film 3 formed from a resin material welded to an opening 11a of a container 11, and comprises: a substrate 21 including a substrate layer 31 and a sealant layer 32 provided on one main surface of the substrate layer 31; and a processing portion 22 which is formed in the substrate layer 31 and penetrates a groove 41 including an intersection point intersecting at least one location, and the substrate layer 31 and the sealant layer 32, and which includes one or more holes 42 provided within a virtual circle C with the groove 41 as its diameter.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a film for use in a cup container, a lid using the film, a container containing a content using the lid, and a method for manufacturing the lid. [Background technology]

[0002] A technique is known in stores and other places where a beverage is supplied to a cup and the opening of the cup is covered with a lid to prevent the beverage from spilling. Another known technique is to form a lid for a cup by welding a film made of a resin material or synthetic paper to the opening of the cup (see, for example, Patent Document 1). Such a lid is formed by adhering a film or cellophane layer with an adhesive to a film layer that has cross-shaped slits formed to form an opening for inserting a straw. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-204033 Summary of the Invention [Problem to be solved by the invention]

[0004] The above-mentioned lid has a slit to form a hole for inserting a straw, and two layers of film are overlapped to seal the slit until the straw is inserted. However, adhering two layers of film makes the manufacturing process complicated. Also, a technique for forming a non-adhesive area around the slit is known, but if the tip of the straw is not sharp, there is a risk that the film covering the slit will not be able to be broken.

[0005] Furthermore, if the beverage contains carbon dioxide or is hot, placing a lid on the opening of the cup container may increase the internal pressure, causing the lid to expand and burst.On the other hand, if a slit is made in the film lid and the slit is not covered, there is a risk of the beverage leaking or foreign matter getting mixed in.

[0006] Therefore, an object of the present invention is to provide a film, a lid, a container containing contents, and a method for manufacturing the lid that allows easy insertion of a straw and allows adjustment of internal pressure. [Means for solving the problem]

[0007] According to one aspect of the present invention, the film is formed of a resin material and is welded to the opening of a container, and comprises a substrate including a substrate layer and a sealant layer provided on one main surface of the substrate layer, and a processed portion including a groove formed in the substrate layer and including at least one intersection, and one or more holes provided within an imaginary circle whose diameter is the longitudinal length of the groove, penetrating the substrate layer and the sealant layer. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a film, a lid, a container containing contents, and a method for manufacturing a lid that allows easy insertion of a straw and allows internal pressure adjustment. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a perspective view showing a schematic configuration of a container containing contents according to an embodiment of the present invention; [Figure 2] FIG. 10 is a plan view showing the configuration of a lid having a processed portion formed thereon, which is used for the container containing the same contents. [Figure 3] FIG. [Figure 4] FIG. 10 is a plan view showing the configuration of another example of the processing unit. [Figure 5] FIG. 10 is a plan view showing the configuration of another example of the processing unit. [Figure 6] FIG. 10 is a plan view showing the configuration of another example of the processing unit. [Figure 7] FIG. 10 is a plan view showing the configuration of another example of the processing unit. [Figure 8] FIG. 2 is an explanatory diagram showing an example of the production of a film used for a lid. [Figure 9] FIG. 10 is an explanatory diagram showing an example of the results of evaluation test 1 of the lid. [Figure 10] FIG. 10 is an explanatory diagram showing an example of the results of evaluation test 2 of the lid. [Figure 11] FIG. 10 is an explanatory diagram showing an example of the results of evaluation test 2 of the lid. DETAILED DESCRIPTION OF THE INVENTION

[0010] A content-containing container 1 using a film 3 according to one embodiment of the present invention will be described below with reference to FIGS. 1 to 9. FIG. FIG. 1 is a perspective view showing a schematic configuration of a content-filled container 1 according to one embodiment of the present invention. FIG. 2 is a plan view showing the configuration of a lid 12 formed with a processed portion 22, which is used for the content-filled container 1. FIG. 3 is a cross-sectional view showing the configuration of the processed portion 22. FIGS. 4 to 7 are plan views showing other examples of the configuration of the processed portion 22. FIG. 8 is an explanatory diagram showing an example of the production of a film 3 used for the lid 12. FIG. 9 is an explanatory diagram showing an example of the results of an evaluation test of the lid 12.

[0011] As shown in FIG. 1 , content-containing container 1 includes cup (container) 11, lid 12, and content 13. Here, content 13 is, for example, a beverage that can be consumed using a straw, such as a liquid, a liquid containing solids, a gel, or a mousse. Content-containing container 1 is formed, for example, by filling cup 11 with a beverage and then fastening lid 12 to cup 11 at a store. Furthermore, content 13 is, for example, a beverage whose internal pressure changes, for example, increases, when lid 12 is welded to cup 11 after filling, such as a beverage containing carbon dioxide or a beverage whose temperature is higher (high temperature) than the outside air temperature. Note that the beverage (contents 13) is not limited to these, and there are no restrictions on the temperature or carbon dioxide content as long as it is a beverage that can be accommodated in cup 11. However, it is preferable that the beverage (contents 13) in the content-containing container 1 be one that, when filled into a sealed container (sealed container), causes a change in internal pressure, i.e., one that generates a pressure difference between the inside and outside of the container. Specifically, if the beverage contains carbon dioxide or is hotter than the outside temperature, such as a hot beverage, the internal pressure of the content-containing container 1 increases, while if the beverage is colder than the outside temperature, such as a cold beverage, the internal pressure of the content-containing container 1 decreases. Therefore, the content-containing container 1 is formed with a hole 42 in the lid 12 that can accommodate changes in the internal pressure of the content-containing container 1 due to the beverage, and is designed to easily accommodate the insertion of a straw. The lid 12 is then opened by inserting a straw, allowing the content to be consumed.

[0012] The cup 11 is formed in a bottomed tubular shape with a closed bottom and an open top. The cup 11 may be cylindrical or polygonal. A lid 12 is welded to an opening 11a at the top of the cup 11. For example, the top of the cup 11 may have a curled portion or a flange. The cup 11 is formed from a paper base material or a resin material.

[0013] The lids 12 are formed from a film 3 on which a processed portion 22 is formed. As shown in Figures 1 to 3, the lids 12 (film 3) include a base material 21 and a processed portion 22 formed on the base material 21. For example, the film 3 is a roll that forms a plurality of lids 12, but it may be trimmed to the same shape as the lids 12, or it may be formed into a rectangular shape with the same width as the maximum outer diameter or maximum width of the lids 12, and then trimmed during or after welding to the cup container 11.

[0014] The substrate 21 is formed of a resin material. As shown in FIG. 3 , the substrate 21 includes a substrate layer 31 and a sealant layer 32. The substrate layer 31 may be formed of, for example, a biaxially oriented or uniaxially oriented film, or may be formed of two or more layers, regardless of the combination of biaxially oriented film and uniaxially oriented film. Examples of biaxially oriented films include biaxially oriented PET film, biaxially oriented NY film, biaxially oriented PP film, biaxially oriented PBT film, biaxially oriented PET / PBT blend film, biaxially oriented polyester blend film, biaxially oriented NY film laminated with PET, biaxially oriented films made of a single barrier resin such as biaxially oriented PVA film or biaxially oriented EVOH film, and co-extruded biaxially oriented films having a barrier resin intermediate layer such as PP / EVOH / PP, NY / EVOH / NY, or NY / MXD-NY / NY. Furthermore, films in which a general-purpose biaxially oriented film is coated with a PVA-based, PVDC-based, or PAA-based barrier resin, hybrid coated films in which an inorganic substance is dispersed in the aforementioned barrier resins, and transparent inorganic vapor-deposited films in which silica, alumina, or the like is vapor-deposited can also be suitably used for the substrate layer 31. Examples of uniaxially oriented films include uniaxially oriented PET film, uniaxially oriented NY film, uniaxially oriented PP film, uniaxially oriented PBT film, uniaxially oriented PET / PBT blend film, uniaxially oriented polyester blend film, uniaxially oriented NY film laminated with PET, uniaxially oriented films made of a single barrier resin such as uniaxially oriented PVA film or uniaxially oriented EVOH film, and coextruded uniaxially oriented films having a barrier resin such as PP / EVOH / PP, NY / EVOH / NY, or NY / MXD-NY / NY in an intermediate layer. In addition, films in which a general-purpose uniaxially stretched film is coated with a PVA-based, PVDC-based, or PAA-based barrier resin, hybrid coated films in which an inorganic substance is dispersed in the aforementioned barrier resin, and inorganic transparent vapor-deposited films in which silica, alumina, or the like is vapor-deposited can also be suitably used for the base layer 31.

[0015] The sealant layer 32 is integrally provided on the entire surface of one main surface of the base layer 31 via an adhesive layer. The sealant layer 32 can be made of an appropriate adhesive selected from general dry lamination adhesives for food applications, as long as it can be welded to the opening of the cup container 11. As an example, the base material 21 has the base layer 31 made of PET with a thickness of 9 μm to 16 μm, and the sealant layer 32 made of easy-peel adhesive with a thickness of 30 μm.

[0016] 1 to 3, the processed portion 22 is composed of a groove 41 formed in the base layer 31 and a hole 42 penetrating the base layer 31 and the sealant layer 32. The processed portion 22 is formed by a laser beam such as a carbon dioxide laser. For example, the irradiation position of the laser beam may be defocused depending on the depth and width of the groove 41 to be formed in the base layer 31, the diameter of the hole 42, etc. The defocus range is set to, for example, 1 mm to 10 mm.

[0017] The grooves 41 are formed by irradiating the base layer 31 with a laser beam and scanning the laser beam along the shape of the grooves 41 for a predetermined time. The grooves 41 are half-cut grooves that are formed in the base layer 31 and not in the sealant layer 32, as shown in FIG. 3, for example. The grooves 41 include at least one intersection. The grooves 41 are formed, for example, in a linear shape. As a specific example, two intersecting grooves 41 are formed in the base layer 31.

[0018] As an example, as shown in FIG. 2 , two linear grooves 41 are formed by intersecting at a predetermined angle, for example, in the range of 3° to 90°. Here, if the lower limit of the predetermined angle between the two linear grooves 41 is less than 3°, the overlapping of the grooves 41 due to the characteristics of laser processing makes it difficult for the grooves 41 to form an angle with each other, and therefore no intersections are actually formed. As another example, three or more grooves 41 may be provided, as shown in the example shown in FIG. 4 where three linear grooves 41 are formed and the example shown in FIG. 5 where four linear grooves 41 are formed. Furthermore, the grooves 41 may be configured in any way so long as an intersection is formed. For example, the intersections may be formed by a continuous shape. Furthermore, the grooves 41 are not limited to being linear, and may be curved as long as an intersection is formed. For example, examples of grooves 41 where an intersection is formed by a continuous shape include an “8” shape and an “α” shape, but other shapes are also possible. For example, the maximum width of the groove 41 may be set to a width that allows a straw expected to be used in the content-containing container 1 to be inserted therein, and is set to a width that is equal to or greater than the outer diameter of the straw expected to be used.

[0019] One or more holes 42 are formed in the portion of groove 41 where it has the widest width, i.e., within an imaginary circle that passes through both longitudinal ends of groove 41, for example, within an imaginary circle whose diameter is the longitudinal length (width) of groove 41. Preferably, holes 42 are formed at intersections of grooves 41, as shown in FIG. 2. Note that holes 42 may be formed on grooves 41 other than at intersections, as shown in FIG. 6, or may be located within an imaginary circle having the same diameter as the longitudinal length of groove 41, but spaced apart from groove 41, as shown in FIG. 7. Note that an example of an imaginary circle having the same diameter as the maximum width of groove 41 is shown by a two-dot chain line C in FIG. 7.

[0020] Furthermore, the holes 42 may not be provided at the intersections of the grooves 41, i.e., may be provided on the grooves 41 other than the intersections, or one or more holes may be provided within an imaginary circle that passes through the portion of the groove 41 that is the widest and avoids the grooves 41, as shown in Fig. 7. In the example of Fig. 7, four holes 42 are provided, but the number may be one or more. The holes 42 are formed by irradiating a laser beam to a predetermined position where the holes 42 are to be formed.

[0021] For example, when three or more grooves 41 are formed and holes 42 are formed at the intersections of these grooves 41, the holes 42 may be formed by scanning the laser light three times at the intersections without irradiating the laser light at a predetermined position.

[0022] The inner diameter of such hole 42 is formed to be a diameter that allows for the internal gas to be discharged and the internal pressure to be adjusted (reduced), for example, when the internal pressure increases. Furthermore, the inner diameter of hole 42 is preferably a diameter that prevents leakage (dripping) of contents 13 when container 1 containing contents is turned upside down, i.e., when container 1 containing contents is turned so that lid 12 is facing downward and cup 11 is facing upward, due to the surface tension of contents 13. For example, the opening area of ​​hole 42 is preferably 0.04 mm^2 or more, which is the lower limit for adjusting the internal pressure, more preferably 0.10 mm^2 or more, and less than 1.6 mm^2, which is the upper limit for preventing or suppressing leakage of contents 13. For reference, when hole 42 is circular, the inner diameter of hole 42 is preferably 0.2 mm or more, which is the lower limit at which the internal pressure can be adjusted, more preferably 0.4 mm or more, and 0.8 mm or less, which is the upper limit at which leakage of contents 13 can be prevented or suppressed. However, since the shape of hole 42 is not limited to a circle and may be an ellipse or a shape other than a circle, hole 42 is preferably managed by its area.

[0023] Next, a method for manufacturing the lid 12 will be described. First, a roll of the substrate 21 having the substrate layer 31 and the sealant layer 32 and elongated in one direction is formed. As a specific example, two or more types of films each including the substrate layer 31 and the sealant layer 32 are laminated together and wound into a roll to form the roll of the substrate 21. Next, as shown in FIG. 8, the roll of the substrate 21 is sent out by a conveying device 201 along a conveying path formed by a plurality of rollers 201a, and a laser beam is irradiated onto the substrate 21 by a laser beam irradiating device 202 to form grooves 41 and holes 42, thereby manufacturing a roll of film 3 having processed portions 22 formed on the substrate 21.

[0024] For example, the film 3 may be distributed as a roll, and the lid 12 may be formed when or after the film 3 is heat-sealed and welded to the opening of the cup-shaped container 11 filled with the contents 13, by trimming the film 3 to the outer shape of the lid 12. Alternatively, the film 3 may be distributed as a rectangular sheet having the maximum width of the outer shape of the lid 12, for example, the same width as the maximum diameter of the circle, by which the film 3 is heat-sealed and welded to the opening of the cup-shaped container 11 filled with the contents 13, by trimming the film 3 to the outer shape of the lid 12, by which the lid 12 is formed. Alternatively, the film 3 may be trimmed from the original roll to form a sheet having the outer shape of the lid 12, and the lid 12 may be distributed, and the lid 12 may be heat-sealed and welded to the opening of the cup-shaped container 11 filled with the contents 13.

[0025] Furthermore, the size of the film 3 (lid 12) is set, for example, to match the shape of the cup container 11. For example, it is formed to match a plurality of shapes such as small size, medium size, large size, and mega size depending on the capacity of the cup container 11. Note that the film 3 (lid 12) may be formed in a size that can be used for cup containers 11 of a plurality of capacities.

[0026] Furthermore, the processed portion 22 of the lid 12 may be formed when or after welding the base material 21, on which the processed portion 22 is not formed, to the cup container 11. In this case, a laser processing device may be provided in an apparatus for welding the lid 12 (film 3) to the cup container 11.

[0027] With this configuration, the processed portion 22 formed in the lid 12 easily breaks when a straw is inserted, making it easier to insert the straw. Furthermore, because the processed portion 22 has holes 42 in addition to the grooves 41, less force is required to break the processed portion 22 when inserting the straw. Therefore, the lid 12 can easily break the processed portion 22 even if the tip of the straw used is not at an acute angle and is on a flat surface. This prevents the processed portion 22 from failing to break in the content-filled container 1.

[0028] Furthermore, since processed portion 22 has holes 42, it is possible to suppress an increase in the internal pressure of content-containing container 1 even when content 13 contains carbon dioxide or is at a high temperature. Furthermore, by making the opening area of ​​hole 42 0.04 mm^2 or more, more preferably 0.10 mm^2 or more, it is possible to efficiently reduce the internal pressure, and by making it less than 1.60 mm^2, it is possible to suppress the beverage from spraying out of hole 42 in addition to reducing the internal pressure.

[0029] Furthermore, by forming the hole 42 in advance in the lid 12 (film 3) by laser processing as the processed portion 22, there is no need for a store clerk or the like to manually make a needle hole after filling the cup container 11 with the contents 13 using the device and welding the lid. This ensures the function of releasing internal pressure and reduces the work of the store clerk. This is because, for example, in a configuration in which a hole is made using a needle, if the needle's puncture depth varies and the inner diameter of the hole varies, this can lead to variations in the inner diameter of the hole depending on the store clerk. If the hole diameter is too small, the function of releasing internal pressure cannot be ensured, or if the hole diameter is too large, there is a risk of foreign matter entering. Furthermore, since the store clerk must make a hole in the lid (film) with an attached needle and then weld the lid to the cup container 11 to serve the product, the additional step of making a hole with a needle increases the work time. Furthermore, if a hole is mechanically made by piercing it with a needle after welding the lid to the cup container 11, there is a risk that foreign matter such as a part of the torn film 3 may get mixed into the contents 13. In contrast, by forming the hole 42 together with the groove 41 in the lid 12 using laser light, it is possible to reduce the work required by the store clerk, ensure a suitable inner diameter for the hole 42, and prevent foreign matter from getting mixed into the contents 13.

[0030] [Evaluation Test 1] Next, evaluation test 1 for the lid 12 (film 3) on which the processed portion 22 is formed will be described below. Evaluation test 1 evaluates the ease of breaking the processed portion 22 of the lid 12 with a straw. For evaluation test 1, nine samples each of the lids 12 of Examples 1 and 2 and the packaging containers of Comparative Examples 1 to 3 were created. Then, the lid 12 of the Example and the lids of Comparative Examples 1 to 3 were each heat-sealed to the opening of the same cup container 11. A compression tester was used to move a paper straw with its tip end aligned in a direction perpendicular to the axial direction at speeds of 100 mm / min, 200 mm / min, 300 mm / min, 400 mm / min, 500 mm / min, 600 mm / min, 700 mm / min, 800 mm / min, and 900 mm / min, respectively, to press the straw against the lid 12 and measure the breaking load (N). PET(16) / EP(30) was used for the substrate 21 in the Examples and Comparative Examples 1 to 3. The compression tester used was an AGS-X 10N-10kN manufactured by Shimadzu Corporation, and the grooves 41 and / or holes 42 formed in the example, comparative example 2, and comparative example 3 were formed using a carbon dioxide laser machine, an LP-430U manufactured by Panasonic Corporation. The straws used in evaluation test 1 had an outer diameter of 7 mm.

[0031] The lid 12 of Example 1 had two grooves 41 and a hole 42 formed at the intersection of the two grooves 41 as the processed portion 22. The position on the lid 12 where the straw is pressed was set so that the center of the straw faced the hole 42. The length of the two grooves 41 was 10 mm, the angle between the two grooves 41 was 90°, and the opening area of ​​the hole 42 was 0.12 mm^2.

[0032] The lid 12 of Example 2 had three grooves 41 and holes 42 formed at the intersections of the three grooves 41 as the processed portion 22. The position on the lid 12 where the straw is pressed was the position where the center of the straw faces the hole 42. Of the three grooves 41, two grooves 41 were 10 mm long, and the remaining groove 41 was 0.2 mm long. The angle between adjacent grooves 41 was 90° between the two 10 mm grooves 41, and the angle of the 0.2 mm groove 41 relative to the 10 mm groove 41 was 45°, and the opening area of ​​the hole 42 was 0.15 mm^2.

[0033] The lid of Comparative Example 1 was configured so that the base material 21 did not include the processed portion 22. The position of the lid where the straw was pressed was set so that the center of the straw faced the center of the lid.

[0034] The lid 12 of Comparative Example 2 was configured to have a hole 42 formed as a processed portion, and not to have two grooves 41. The position on the lid 12 where the straw was pressed was set so that the center of the straw faced the hole 42. The hole 42 was formed by puncturing it with a needle having a diameter of 1.0 mm and a cross-sectional area of ​​approximately 0.785 mm^2.

[0035] The lid of Comparative Example 3 was configured to have two grooves 41 formed as processed portions, and no holes 42 formed. The position on the lid 12 where the straw was pressed was such that the center of the straw faced the intersection of the two grooves 41. The length of the two grooves 41 was 10 mm, and the angle between the two grooves 41 was 90°. The grooves 41 were formed using a carbon dioxide laser machine, LP-430U manufactured by Panasonic Corporation.

[0036] The lid of Comparative Example 4 was configured with three grooves 41 formed as the processed portion 22, and no holes 42 formed. The position where the straw was pressed on the lid was set so that the center of the straw was opposite the process of two grooves 41. Of the three grooves 41, two grooves 41 were 10 mm long, and the remaining groove 41 was 0.2 mm long. The angle between adjacent grooves 41 was 90° between the two 10 mm grooves 41, and the angle of the 0.2 mm groove 41 relative to the 10 mm groove 41 was 45°.

[0037] [Results of evaluation test 1] The results of evaluation test 1 are shown in Figure 9. As shown in Figure 9, the breaking load required to break processed portion 22 of lid 12 in Example 1 was smaller than the breaking loads required to break the processed portions of the lids in Comparative Examples 2 to 4, for all samples. Furthermore, the breaking load required to break processed portion 22 of lid 12 in Example 2 was smaller than the breaking load required to break the processed portion of the lid in Comparative Example 2, and was equal to or smaller than the breaking loads required to break the processed portions of the lids in Comparative Examples 3 and 4.

[0038] Furthermore, the lid of Comparative Example 1 did not break at speeds other than 500 mm / min. As can be seen from this, it was made clear that by using the lid 12 (film 3) in which grooves 41 and holes 42 that intersect at one or more locations are formed as the processed portion 22 for inserting a straw, the processed portion 22 can be easily broken. In particular, paper straws with flat tip surfaces and thick walls are used these days, but it was found that even such paper straws can be inserted reliably and easily.

[0039] [Evaluation Test 2] Next, evaluation test 2 of the lid 12 (film 3) on which the processed portion 22 is formed will be described below. Evaluation test 2 evaluates the leak resistance of the contents 13 and the function of adjusting the internal pressure by forming the hole 42. For evaluation test 2, grooves 41 intersecting at 90° were formed, and samples were prepared in which no hole 42 was formed and holes 42 with opening areas of 0.05 mm^2 to 2.00 mm^2 were formed. Note that the opening area of ​​the hole 42 was varied in 0.05 mm^2 increments within the range of 0.05 mm^2 to 1.00 mm^2, and varied in 0.10 mm^2 increments within the range of 1.00 mm^2 to 2.00 mm^2.

[0040] These lids 12 were then welded to cup containers 11 filled with four different types of contents 13 to create samples. The contents 13 were iced coffee, 90°C hot coffee, a slightly carbonated drink, and a strongly carbonated drink. Kirin Lemon manufactured by Kirin Holdings Co., Ltd. was used for the slightly carbonated drink, and IC Spark manufactured by Coca-Cola Co., Ltd. was used for the strongly carbonated drink. The amount of contents 13 filled into cup container 11 was such that the contents 13 were positioned in hole 42 when container 1 with the contents was placed horizontally.

[0041] Then, after placing each sample horizontally for 3 seconds, leakage of contents 13 from hole 42 was confirmed, and after placing the sample vertically for 30 seconds, deformation of lid 12 was confirmed when the sample was subjected to vibration.

[0042] If the contents 13 did not leak from the hole 42 even after 3 seconds or more had passed since the sample was placed horizontally, it was marked as "○", and if the contents 13 leaked from the hole 42 within 3 seconds, it was marked as "×".

[0043] Furthermore, when the sample was placed upright and vibrated after 30 seconds, if there was no tension in the lid 12, the internal pressure was well adjusted and marked with an "O"; if there was some tension in the lid 12, the seal of the lid 12 had not broken, but the internal pressure adjustment function was slightly low and marked with a "△"; and if any of the heat-sealed points of the lid 12 and the cup container 11 were broken, the internal pressure was not adjusted and marked with an "X".

[0044] [Results of evaluation test 2] The results of evaluation test 2 are shown in Figures 10 and 11. Note that in Figures 10 and 11, the results were the same when the opening area of ​​the hole 42 was in the range of 0.50 mm^2 to 0.95 mm^2, so descriptions are omitted.

[0045] As shown in the results of the leakage evaluation test shown in Figure 10, no leakage occurred from the hole 42 in the lid 12 without the hole 42 or in the lid 12 with the hole 42 having an opening area of ​​0.05mm^2 to 1.50mm^2 for any sample of the contents 13. In the lid 12 with the hole 42 having an opening area of ​​1.60mm^2 or more, leakage occurred from the hole 42 for any sample of the contents 13. From this, it became clear that, in consideration of leakage performance, it is preferable that the opening area of ​​the hole 42 is less than 1.60mm^2.

[0046] As shown in the results of the evaluation test on internal pressure in Figure 11, in the lid 12 without the hole 42, the lid 12 of the sample containing iced coffee as the contents 13 did not become taut, but in the sample containing contents 13 other than iced coffee, the heated parts of the lid 12 and the cup container 11 were damaged.

[0047] In the lid 12 with a hole 42 having an opening area of ​​0.05 mm^2, the lid 12 did not tensile in the sample containing iced coffee as the contents 13, the lid 12 tensed slightly in the samples containing hot coffee and lightly carbonated beverages as the contents 13, and the heated portion of the lid 12 and cup 11 broke in the sample containing a strongly carbonated beverage as the contents 13. However, it was found that for contents 13 other than strongly carbonated beverages, a hole 42 with an opening area of ​​0.05 mm^2 is capable of adjusting internal pressure, and it can be estimated that even an opening area of ​​less than 0.05 mm^2 can prevent breakage of the heat-sealed portion of the lid 12 depending on the type of contents 13. Therefore, it can be seen that an opening area of ​​0.04 mm^ or more can adjust internal pressure for certain types of contents 13.

[0048] In the lid 12 having a hole 42 with an opening area of ​​0.10 mm^2, the lid 12 did not tens up in the sample containing iced coffee as the contents 13, and the lid 12 tensed slightly in the sample containing contents 13 other than iced coffee, but no damage occurred in any of the samples, indicating that it was possible to adjust the internal pressure.

[0049] In the lids 12 having holes 42 with an opening area of ​​0.15 mm^2 and 0.20 mm^2, the lids 12 did not swell in the samples containing iced coffee and hot coffee as contents 13, but swelled in the samples containing lightly carbonated beverages and strongly carbonated beverages as contents 13. However, no damage occurred in any of the samples, demonstrating that it is possible to adjust the internal pressure.

[0050] In the lids 12 having holes 42 with opening areas of 0.25 mm^2 and 2.00 mm^2, it was found that no tension occurred in the lids 12 for all content 13 samples, and that internal pressure could be adjusted well.

[0051] From these results, it became clear that the internal pressure adjusting function of the lid 12 can be obtained by setting the opening area of ​​the hole 42 to 0.04 mm^2 or more, more preferably 0.10 mm^2 or more.

[0052] As described above, the film 3, lid 12, content-containing container 1, and method of manufacturing the lid 12 according to the embodiment make it easy to insert a straw and enable adjustment of internal pressure.

[0053] The present invention is not limited to the configuration of the above-described embodiment. For example, although the above-described content-containing container 1 has been described as using a cup container 11 as an example of a container, the present invention is not limited to this. For example, the container 11 is not limited to a cup-shape and may be cup-shaped, tray-shaped, or the like. That is, various containers can be used as the content-containing container 1 as long as the container 11 is configured to use a lid 12 that can be broken by a separate member such as a straw and can accommodate content 13 whose internal pressure requires adjustment. Furthermore, while the content-containing container 1 described above is configured so that the lid 12 can be broken by a straw, the present invention is not limited to this. For example, as long as a portion of the lid 12 can be broken by a member that is long in one direction, such as a rod-shaped or cylindrical member, the member that breaks the lid 12 can be appropriately selected.

[0054] The present invention is not limited to the above-described embodiments, and various modifications can be made in the implementation stage without departing from the spirit of the invention. Furthermore, the embodiments may be implemented in appropriate combinations, in which case the combined effects can be obtained. Furthermore, the above-described embodiments include various inventions, and various inventions can be extracted by combining selected elements from the disclosed elements. For example, if the problem can be solved and the desired effect can be obtained even if some elements are deleted from all elements shown in the embodiments, the configuration from which these elements are deleted can be extracted as an invention. [Explanation of symbols]

[0055] 1...container containing contents, 3...film, 11...cup container (container), 11a...opening, 12...lid, 13...contents, 21...base material, 22...processed portion, 31...base material layer, 32...sealant layer, 41...groove, 42...hole, 201...conveying device, 201a...roller, 202...laser light irradiation device.

Claims

1. A film made of a resin material that is welded to the opening of a container, a substrate including a substrate layer and a sealant layer provided on one main surface of the substrate layer; a processed portion including a groove formed in the base material layer and including at least one intersection, and one or more holes provided within an imaginary circle having a diameter equal to the longitudinal length of the groove, penetrating the base material layer and the sealant layer; A film comprising:

2. The film according to claim 1 , wherein one hole is provided at the intersection of the grooves.

3. The film according to claim 1 , wherein the opening area of ​​the holes is equal to or greater than 0.04 mm^2 and less than 1.60 mm^2.

4. The film according to claim 1 , wherein two grooves are provided to form the intersection.

5. A lid formed from the film of any one of claims 1 to 4.

6. A cup container and A content filled in the cup container; The lid according to claim 5 welded to the opening of the cup; A container containing a content.

7. 7. The container according to claim 6, wherein the contents create a pressure difference between the inside and outside of the sealed container.

8. A method for manufacturing a lid formed of a resin material to be welded to an opening of a container, comprising: Irradiating a laser beam to form a groove including an intersection point in a base layer of a base material including a base layer of a film and a sealant layer integrally provided on one main surface of the base layer, the laser light is irradiated to form holes penetrating the base layer and the sealant layer at the intersections of the grooves. How the lid is manufactured.

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