Beverage paper container and method for manufacturing a beverage paper container

Abstract

To provide a paper beverage container that can significantly reduce the risk of the bottom of the paper beverage container being damaged by an impact applied to the bottom of the paper beverage container to the point where the beverage leaks out of the paper beverage container.SOLUTION: A beverage paper container 1 includes: a container bottom 11; and a cylindrical container body 12 erected around the container bottom 11. A lower folded portion 110, in which the outer periphery of the container bottom 11 is folded downward, has its outer surface facing the inner periphery of the container body 12, and this facing portion 111 has an adhesive-fixed portion 111a on the lower side, which is adhesively fixed with the inner periphery of the container body 12, and a displacement portion 111b on the upper side, which is not adhered to the inner periphery of the container body 12.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a paper beverage container for containing cold beverages, and a method for manufacturing the same, which can significantly reduce the risk of the bottom of the paper beverage container being damaged by an impact applied to the bottom of the paper beverage container to the state where the beverage in the paper beverage container leaks out.

Background Art

[0002] In recent years, a business model of extracting and providing cold beverages such as juice and iced coffee on-site from dispensers and coffee machines has been spreading. In particular, with the progress of coffee machine technology, it has become possible to switch the roasting method such as espresso extraction and drip extraction for iced coffee. Therefore, not only in coffee shops but also in convenience stores, by installing such a coffee machine, it has become possible to provide customers with iced coffee with a very high-quality and flavorful taste.

[0003] For example, when providing cold beverages in a convenience store, a plastic container filled with ice is placed on the placement part of a coffee machine, and a push button is pressed. Thereby, the cold beverage can be poured into the container from the pouring outlet. In providing such cold beverages to customers, it is necessary to fill the container with ice in advance. Usually, ice is automatically filled into the container by an ice filling machine of an ice manufacturing company, top-sealed, boxed, and these are transported to each convenience store. When automatically filling ice by an ice filling machine, it can be realized by dropping ice from an ice discharge part into the container.

[0004] By the way, under the recent social demand for environmental protection, containers for containing cold beverages also need to change the material from plastic to paper. Although various technologies related to paper containers have been proposed (see, for example, Patent Document 1), all of them have been used particularly when containing warm beverages in order to prevent burns by suppressing heat conduction to the hand holding the paper container.

[0005] However, when pouring cold beverages into paper containers, ice is added by dropping it into the container from above, as described above. Conventional paper containers, designed to hold hot beverages, are not constructed to withstand the impact of falling ice, and there is a risk that the bottom of the paper container, in particular, may peel off or break due to the impact of the falling ice.

[0006] In addition, when these paper containers are delivered to coffee shops and convenience stores, they are stacked on top of each other and transported in trucks or other vehicles. During this transport process, the stacked containers may collide with each other due to the impact of transport, or the impact of the ice they contain may cause the bottom of the containers to peel off and break. Furthermore, when displaying paper containers filled with ice in freezers at coffee shops and convenience stores, there was a risk that the bottom of the containers could be damaged if they were accidentally dropped. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Patent Publication No. 2019-64659 [Overview of the project] [Problems that the invention aims to solve]

[0008] Therefore, the present invention was devised in view of the above-mentioned problems, and its objective is to provide a beverage paper container that can significantly reduce the risk of the bottom of the beverage paper container being damaged to the point of leakage due to impact when ice is dropped into the container, when beverage paper containers are stacked and transported together, and when a beverage paper container filled with ice is accidentally dropped, and a method for manufacturing this beverage paper container. [Means for solving the problem]

[0009] The beverage paper container according to the first invention comprises a container bottom and a cylindrical container body erected around the container bottom, wherein the outer circumference of the container bottom is folded downward, and the downward folded portion has an outer surface facing the inner circumference of the container body, and the facing portion has an adhesive fixed portion on the lower side that is adhesively fixed to the inner circumference of the container body and an unglued displacement portion on the upper side that is not adhesive to the inner circumference of the container body. The area ratio of the adhesive fixing portion in the opposing portion is set to 70% or more and 80% or less, and the folded portion at the lower end of the container body, which is folded upward, is adhesively fixed to the opposite surface of the opposing portion in the downward folded portion. It is characterized by the following:

[0010] The beverage paper container according to the second invention is characterized in that, in the first invention, when the diameter of the upper surface of the bottom of the container is a, the diameter of the upper surface of the bottom of the container when a load is applied to the upper surface of the bottom of the container and it deforms is b, and the length of the displacement allowance is c, the relationship a + 2c ≥ b holds.

[0012] The 3 The beverage paper containers according to the invention are the first to the second inventions. 2 In any of the inventions, the bottom height from the lower end of the lower folded portion to the upper surface of the container bottom is 3 to 14 mm. [Effects of the Invention]

[0016] According to the present invention, which has the configuration described above, it is possible to provide a beverage paper container that can significantly reduce the risk of the bottom of the beverage paper container being damaged to the point where the beverage leaks out due to an impact applied to the bottom of the beverage paper container. [Brief explanation of the drawing]

[0017] [Figure 1] Figure 1 is a side cross-sectional view showing a beverage paper container according to an embodiment of the present invention. [Figure 2] Figure 2 is a schematic diagram illustrating the structure of a beverage paper container according to an embodiment of the present invention. [Figure 3] Figure 3 is a schematic diagram illustrating the structure of a conventional beverage paper container, which serves as a comparative example. [Figure 4]FIG. 4 is an explanatory diagram showing an example of a bottom roller used in a method for manufacturing a paper beverage container according to an embodiment of the present invention. [Figure 5] FIG. 4 is an explanatory diagram showing another example of a bottom roller used in a method for manufacturing a paper beverage container according to an embodiment of the present invention. [Figure 6] FIG. 6 is an explanatory diagram showing the position of a bottom burner used in a method for manufacturing a paper beverage container according to an embodiment of the present invention. [Figure 7] FIG. 7 is an explanatory diagram showing an example of a pilot ring used in a method for manufacturing a paper beverage container according to an embodiment of the present invention. [Figure 8] FIG. 8 is an explanatory diagram for explaining a method of testing the bottom load resistance. [Figure 9] FIG. 9 is a graph showing the results of the bottom load resistance test. [Embodiments for Carrying Out the Invention]

[0018] Hereinafter, embodiments exemplified by applying the present invention will be described with reference to the drawings.

[0019] [Embodiment] FIG. 1 is a side cross-sectional view showing a paper beverage container according to an embodiment of the present invention. FIG. 2 is a schematic diagram for explaining the structure of the paper beverage container according to an embodiment of the present invention.

[0020] As shown in FIG. 1, a paper beverage container 1 according to an embodiment of the present invention is a container for storing cold beverages such as iced coffee, iced tea, and juice, and includes a container bottom 11 and a cylindrical container body 12 erected around the container bottom 11. That is, the container bottom 11 provided on the lower end side of the cylindrically formed container body 12 closes the lower end of the cylinder.

[0021] The bottom 11 of the container is formed in a circular shape in plan view and has a downward folding portion 110 whose outer peripheral portion is folded downward. Although not shown in the figure, the bottom 11 of the container is composed of a laminate having a paper base material and a film laminated on the inside of the base material, similar to the body 12 of the container.

[0022] The body 12 of the container is formed by making a laminate similar to the bottom 11 of the container into a cylindrical shape. The body 12 of the container forms a seam portion 31 by making the laminate into a cylindrical shape and bonding the circumferential ends to each other. The body 12 of the container is formed to have an increasing diameter upward, but is not limited thereto, and may be formed in a cylindrical shape such as a circular cylinder without increasing the diameter in the vertical direction. Note that a top curl 2a is formed at the upper end of the body 12 of the container by rounding it outward.

[0023] And, the downward folding portion 110 of the bottom 11 of the container has its outer surface facing the inner peripheral portion of the body 12 of the container, and this facing portion 111 has an adhesion fixing portion 111a adhesively fixed to the inner peripheral portion of the body 12 of the container on its lower side and a displacement allowance portion 111b not adhered to the inner peripheral portion of the body 12 of the container on its upper side.

[0024] Note that the lower end portion of the body 12 of the container has a folding portion 12a, and this folding portion 12a is adhesively fixed to the surface on the opposite side of the facing portion 111 in the downward folding portion 110, increasing the support strength of the bottom 11 of the container at the lower end portion of the body 12 of the container. The adhesion range of this folding portion 12a only needs to have the surface on the opposite side of the adhesion fixing portion 111a adhered, and may include adhesion up to the surface on the opposite side of the displacement allowance portion 111b. Further, the tip of the folding portion 12a (the lower end of the body paper constituting the body 12 of the container) only needs to extend to the opposite side of the adhesion fixing portion 111a, and may extend to the opposite side of the displacement allowance portion 111b (near the back surface of the bottom 11 of the container).

[0025] In this embodiment, the beverage paper container 1, as shown in Figure 2, satisfies the relationship a + 2c ≥ b when a is the diameter of the upper surface 11a of the container bottom 11, b is the diameter of the upper surface 11a of the container bottom 11 shown by the dashed line when a load is applied to the upper surface 11a of the container bottom 11 and it deforms (based on b1 and b2 in Figure 2, b = 2 × b1 + b2), and c is the length of the displacement allowance portion 111b shown by the dashed line.

[0026] In other words, in a conventional beverage paper container 1', almost the entire opposing portion 111 is an adhesive fixed portion 111a. As shown in Figure 3, the relationship b > a holds between the diameter a of the upper surface 11a of the container bottom 11 and the diameter b of the upper surface 11a of the container bottom 11, shown by the dashed line when a load is applied to the upper surface 11a of the container bottom 11 and it deforms (based on b1 and b2 in Figure 3, b = 2 × b1 + b2). This is the opposite of the relationship in the beverage paper container 1 according to this embodiment described above. Therefore, in the beverage paper container 1 according to this embodiment, the larger the area of ​​the upper surface 11a of the container bottom 11 after deformation, the smaller the impact force per unit area, and a sufficient impact force absorption effect can be expected.

[0027] Furthermore, in the beverage paper container 1 according to this embodiment, the area ratio occupied by the adhesive fixing portion 111a in the opposing portion 111 is set to 70%, for example. If the area ratio occupied by the adhesive fixing portion 111a in the opposing portion 111 is set to 70% or more and 80% or less, even if the expected impact force is applied to the upper surface 11a of the container bottom 11 of the beverage paper container 1, it is possible to prevent damage to the point where the beverage leaks out from the container bottom 11. If the area ratio occupied by the adhesive fixing portion 111a in the opposing portion 111 exceeds 80%, the area of ​​the displacement allowance portion 111b becomes too small, and a sufficient impact force absorption effect cannot be expected. Moreover, if the area ratio occupied by the adhesive fixing portion 111a in the opposing portion 111 falls below 70%, the fixing strength of the container bottom 11, which is the main role of the adhesive fixing portion 111a, becomes insufficient, and there is a risk that leakage may occur.

[0028] Furthermore, in the beverage paper container 1 according to this embodiment, the bottom height from the lower end of the lower folded portion 110 to the upper surface 11a of the container bottom 11 is, for example, 3 mm. Although this bottom height is often 3 to 14 mm for this type of beverage paper container, in any case, even if the maximum expected impact force is applied to the upper surface 11a of the container bottom 11 of the beverage paper container 1, it is possible to prevent damage to the point where the beverage leaks out from the container bottom 11.

[0029] Next, a method for manufacturing the beverage paper container 1 according to this embodiment will be described.

[0030] In the manufacturing method of the beverage paper container 1 according to this embodiment, it is advisable to make improvements during the heat-sealing stage for forming the lower folded portion 110.

[0031] For example, if a bottom roller 4A with a chamfered edge on its tip side is used as the bottom roller for this heat fusion stage, as shown in Figure 4, the displacement allowance portion 111b can be easily formed.

[0032] Alternatively, as shown in Figure 5, a bottom roller 4B with rounded corners on its tip side can be used as the bottom roller for this heat-sealing stage, which also allows for the easy formation of the displacement allowance portion 111b.

[0033] Furthermore, if the bottom burner 5 used in this heat fusion stage is stopped at the position indicated by the solid line in the direction of the arrow, as shown in Figure 6, from the normal position indicated by the dotted line, the displacement allowance portion 111b can be easily formed.

[0034] Furthermore, if a pilot ring 6 with a relief 6a on its rear end is used as the pilot ring in this heat-sealing stage, as shown in Figure 7, and a conventional bottom roller 4 is used as the bottom roller, the displacement allowance portion 111b can be easily formed.

[0035] According to the beverage paper container 1 of the embodiment of the present invention described above, when ice is dropped in for filling, when beverage paper containers 1 are stacked on top of each other for transport, and when a beverage paper container 1 filled with ice is accidentally dropped, the risk of the bottom 11 of the beverage paper container 1 being damaged to the point where the beverage leaks out due to the impact applied to the bottom 11 of the beverage paper container 1 can be greatly reduced.

[0036] According to the manufacturing method of the beverage paper container 1 according to the embodiment of the present invention described above, the important displacement allowance portion 111b of the beverage paper container 1 according to the embodiment of the present invention can be easily formed.

[0037] [Example 1] The following describes the experimental verification results conducted to confirm the effects of the present invention. In the experimental verification, test materials for Examples 1 to 3 of the present invention and Comparative Examples 1 and 2, as shown in Table 1 below, were prepared to confirm the moldability of the beverage paper container 1 and its resistance to drop impact.

[0038] Comparative Example 1 has a bottom height of 2 mm from the lower end of the lower folded portion 110 to the surface of the container bottom 11, while Comparative Example 2 has a bottom height of 16 mm. Furthermore, Invention Example 1 has a bottom height of 3 mm, Invention Example 2 has a bottom height of 6 mm, and Invention Example 3 has a bottom height of 14 mm.

[0039] For each of the Invention Examples 1-3 and Comparative Examples 1-2, a beverage paper container 1 was actually manufactured based on the method described above, and its moldability was confirmed. If the desired shape of the container body 12 and container bottom 11 could be molded, it was marked with "○", and if the desired shape of the container body 12 and container bottom 11 could not be molded, it was marked with "×".

[0040] In this experimental verification, for Comparative Examples 1 and 2, the base height was either too low or too high, resulting in the inability to mold into the desired shape. Therefore, the moldability is marked as "×".

[0041] In contrast, for Examples 1 to 3 of the present invention, the bottom height was found to be within the optimal range in all cases, and it was determined that the desired shapes of the container body 12 and container bottom 11 could be formed in all cases. Therefore, the moldability is rated as "○".

[0042] Next, regarding the moldability, under the conditions of bottom height for Examples 1 to 3 of the present invention, which were judged as "○", the resistance to drop impact relative to the area ratio occupied by the adhesive fixing portion 111a was confirmed. This area ratio was prepared not only when the entire opposing portion 111 was composed of the adhesive fixing portion 111a (100%), but also when the area ratio occupied by the adhesive fixing portion 111a in the opposing portion 111 was set to 80% and 70%. An example in which the adhesive fixing portion 111a was 2 mm from the lower folded portion 110 was also prepared for comparison.

[0043] The drop impact resistance test involved filling each of the beverage paper containers 1 from Examples 1 to 3 of the present invention with ice and dropping them. In this resistance test, 180g of acrylic ice was filled into each of the test containers from Examples 1 to 3 of the present invention and dropped from a height of 120cm. The dropped test containers from Examples 1 to 3 of the present invention were then visually inspected to see if any leakage or tearing had occurred. Based on the visual inspection, if leakage or tearing had occurred, it was judged as "×", if there was some leakage or tearing but it was hardly noticeable to the naked eye, it was judged as "△", and if no leakage or tearing had occurred at all, it was judged as "〇".

[0044] As shown in Table 1, the results of the drop impact resistance test showed that in all three of the Invention Examples 1 to 3, tearing occurred when the area ratio occupied by the adhesive fixing part 111a was 100%. In the example where the adhesive fixing part 111a was 2 mm from the lower end of the lower folded part 110, leakage occurred in all cases. When the area ratio occupied by the adhesive fixing part 111a is converted to the example where the adhesive fixing part 111a is 2 mm from the lower folded part 110, the area ratio is 66% for Invention Example 1, 33% for Invention Example 2, and 14.2% for Invention Example 3. It can be seen that the container performance cannot be met with such an area ratio, and leakage occurs in all cases.

[0045] As shown in Table 1, in all three examples of the present invention, 70% were marked with "○" because no leakage or tearing occurred at all, and 80% were marked with "△" because although some tearing occurred, it was at a level that was hardly noticeable to the naked eye.

[0046] Based on the above results, in Examples 1 to 3 of the present invention, if the area ratio occupied by the adhesive fixing portion 111a is 70% or more and less than 80%, a good condition can be achieved in which no leakage or tearing occurs at all. Furthermore, even if the area ratio occupied by the adhesive fixing portion 111a is 70% or more and less than 80%, although some leakage or tearing may occur, it can be kept to a level that is hardly noticeable to the naked eye. Conversely, even if the area ratio is between 70% and less than 100%, it is suggested that it may be possible to keep some leakage or tearing to a level that is hardly noticeable to the naked eye. [Table 1]

[0047] [Example 2] The following describes the results of other experimental verifications conducted to confirm the effects of the present invention. In the experimental verifications, as described above, the resistance to drop impact in relation to the relationship between the length before deformation and the length after deformation was examined.

[0048] The beverage paper container 1 in Comparative Example 3 and Examples 4 and 5 of the present invention is the same size, and the bottom height is 6 mm in all cases.

[0049] Comparative Example 3 is a current product in which the area ratio occupied by the adhesive fixing portion 111a in the opposing portion 111 is 100%. Both Examples 4 and 5 of the present invention are provided with an adhesive fixing portion 111a and a displacement allowance portion 111b, respectively. The heights of each adhesive fixing portion 111a in Comparative Example 3 and Examples 4-5 of the present invention are as shown in Table 2. In both Examples 4 and 5 of the present invention, the proportion of the displacement allowance portion 111b is higher because the height of the adhesive fixing portion 111a is lower than that of Comparative Example 3.

[0050] When the length before deformation and the length after deformation were measured for each test material shown in Comparative Example 3 and Examples 4 and 5 of the present invention, the results were as shown in Table 2. Specifically, in Comparative Example 3, the length before deformation was shorter than the length after deformation, while in Examples 4 and 5 of the present invention, the length before deformation was longer than the length after deformation. [Table 2]

[0051] Each of these test materials was subjected to the drop test described below. In this drop test, 180g of acrylic ice was filled into each of the test materials in Comparative Example 3 and Invention Examples 4 and 5, and they were dropped from a height of 120cm. After the drop, the bottom of the container 11 was visually inspected at the center and the base to see if it had broken. The drop test was performed 100 times for each test material.

[0052] Table 3 shows the results of the drop test. In Comparative Example 3, because the length before deformation was shorter than the length after deformation, rupture occurred in 2% of the center of the container bottom 11 and in 10% of the threaded bottom. In contrast, in Examples 4 and 5 of the present invention, because the length before deformation was longer than the length after deformation, the probability of rupture occurring in both the center and threaded bottom of the container bottom 11 was reduced to 1% or less. [Table 3]

[0053] From the above results, it can be seen that by providing the displacement allowance portion 111b, the length before deformation can be made longer than the length after deformation, and the tearing of the container bottom 11 due to impact from dropping can be effectively prevented.

[0054] [Example 3] The following describes the results of other experimental verifications conducted to confirm the effects of the present invention. In these experimental verifications, the bottom load capacity of the container bottom 11 of each test material of the beverage paper container 1 was actually measured to verify the effects.

[0055] In the bottom load-bearing capacity test, the tip of a φ30 mm jig 35 is brought into contact with the bottom 11 of the container, as shown in Figure 8, and a pressing force is applied to it. A load cell (1000 N), not shown, is attached to the jig 35, allowing the load acting on the jig 35 to be measured.

[0056] The measurement was performed using a load testing machine (strograph), with the indentation speed of the container bottom 11 using the jig 35 set to 50 mm / second. The relationship between the indentation amount (mm) of the jig 35 and the load measured by the load cell was investigated.

[0057] The paper materials used for the bottom 11 and body 12 of the beverage paper container 1 used as the test material are shown in Table 4 below. Both are made of laminated paper, which is raw paper coated with a coating material. [Table 4]

[0058] The coating material, PE, is polyethylene, and its film thickness is as described above.

[0059] Furthermore, the deformation characteristics of the raw paper and laminated paper of the test material are shown in Table 5 below. This Table 5 shows the results of measuring the elongation of each paper in the MD (Machine Direction), which is the papermaking direction in the paper machine (not shown), and in the CD (Cross-machine Direction) direction, which intersects the MD direction. [Table 5]

[0060] A bottom load-bearing capacity test was conducted on each of the test materials used in Comparative Example 3, and in Examples 4 and 5 of the present invention, which utilized a container bottom 11 made of such laminated paper.

[0061] Figure 9 shows the relationship between the load (N) measured by the load cell and the indentation depth (mm) of the jig 35, as a result of this bottom load-bearing test. Table 6 shows the energy (J) values ​​calculated from each load when the indentation depth of the jig 35 is 6 mm for each test material of Comparative Example 3 and Invention Examples 4 and 5. [Table 6]

[0062] As shown in Figure 9, in Examples 4 and 5 of the present invention, since a displacement allowance portion 111b is provided, when the amount of indentation by the jig 35 increases, the displacement allowance portion 111b absorbs energy, thereby reducing the impact on the container bottom 11. As a result, in Examples 4 and 5 of the present invention, the actual load applied to the jig 35 is lower compared to Comparative Example 3, and as a result, the energy (J) calculated from each load when the amount of indentation by the jig 35 is 6 mm can be kept low. Consequently, in Examples 4 and 5 of the present invention, the energy (J / cm2) applied per unit area to the container bottom 11 can be kept low, and as a result, rupture at the container bottom 11 can be prevented.

[0063] Although embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims of the invention and its equivalents. [Explanation of symbols]

[0064] 1. Beverage paper container 11 Bottom of container 11a Top side 110 Lower folding section 111 Opposing part 111a Adhesive fixing part 111b Displacement section 12 Container body 12a Turning section 2a Top curl 31 Seam 35 Jig 4 Bottom Roller 4A Bottom Roller 4B Bottom Roller 5. Bottom Burner 6 Pilot Rings 6a Miss

Claims

1. It comprises a container bottom and a cylindrical container body erected around the container bottom, The downward-folded portion, which is formed by folding the outer circumference of the bottom of the container downwards, has its outer surface facing the inner circumference of the container body. The opposing portion has an adhesive fixing portion on the lower side that is bonded and fixed to the inner circumference of the container body, and a displacement allowance portion on the upper side that is not bonded to the inner circumference of the container body. The area ratio of the adhesive fixing portion in the opposing portion is set to 70% or more and 80% or less. The folded portion at the lower end of the container body is folded upward and is bonded and fixed to the opposite surface of the opposing portion in the downward folded portion. A beverage paper container characterized by the following features.

2. When the diameter of the upper surface of the bottom of the container is a, the diameter of the upper surface of the bottom of the container when a load is applied and it deforms is b, and the length of the displacement allowance is c, the relationship a + 2c ≥ b holds true. A beverage paper container according to claim 1, characterized by the following:

3. The bottom height from the lower end of the downward folded portion to the upper surface of the container bottom is 3 to 14 mm. A beverage paper container according to any one of claims 1 to 2, characterized by the following:

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