Paper beverage container lid, method for forming a drinking spout on a paper beverage container lid, and paper beverage container

Abstract

To provide a lid for a paper-made beverage container capable of forming a drink port facilitating drinking beverage even with no drinking straw and without being removed from the beverage container.SOLUTION: A lid 1 for a beverage container comprises a cover plate part 4 for covering an opening 3 of a beverage container 2, and a side peripheral part 5 engageable with a marginal portion 3a of the opening 3. Furthermore there are provided: a drink port formation line part 11 having a shape of a peripheral edge side of a drink port 110 of the cover plate part 4; a folding low strength part 13 facilitating folding by valley-folding between a drink port formation outer portion 11A and a drink port formation inner portion 11B when the drink port formation portions 11A, 11B surrounded with the drink port formation line part 11 are pushed in from above; and an engagement part capable of being engaged with a locking part 11c of the circumference of the drink port formation outer portion 11A in a state that the drink port formation inner portion 11B is ridge-folded, the drink port formation outer portion 11A is valley-folded and raised, and the drink port formation outer portion 11A and the drink port formation inner portion 11B are folded.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a paper beverage container lid that covers the opening of a beverage container, a method for forming a drinking spout on this paper beverage container lid, and a paper beverage container equipped with this paper beverage container lid. [Background technology]

[0002] Traditionally, many beverage retailers, such as fast food restaurants and convenience stores, have covered the openings of beverage containers, such as plastic (synthetic resin) or paper cups, with beverage container lids to prevent the juice, coffee, or other beverages contained inside from spilling out of the openings when the containers are carried.

[0003] To drink the beverage contained inside the beverage container, one can simply remove the beverage container lid and drink from the opening, but when the beverage container lid is removed, the beverage adhering to the inside of the lid may splash out, potentially staining the drinker's clothes, etc.

[0004] For this reason, it is common to provide a straw insertion portion on a lid for a beverage container, and insert an attached straw into the lid to make it easier to drink the beverage inside the beverage container (see Patent Document 1, etc.).

[0005] However, in recent years, the global movement to eliminate plastic has been gaining momentum, triggered by issues such as marine pollution caused by plastic waste, and as part of this, there has also been a growing movement to eliminate plastic straws.

[0006] Under these circumstances, there is a demand in the market for beverage container lids that eliminate the need for straws and create a drinking spout that makes it easy to drink beverages without removing the lid, and there is also a demand for beverage container lids to be made of paper. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent Publication No. 2021-14286 Summary of the Invention [Problem to be solved by the invention]

[0008] The present invention was devised in light of the above-mentioned background, and its purpose is to provide a lid for a paper beverage container that eliminates the need for a straw and can form a drinking spout that makes it easy to drink from the beverage without removing it from the beverage container, a method for forming a drinking spout on this paper beverage container lid, and a paper beverage container equipped with this paper beverage container lid. [Means for solving the problem]

[0009] The paper beverage container lid according to the first invention is a lid for a paper beverage container comprising a cover plate portion that covers an opening of a beverage container, and a side periphery provided on the outer periphery of the cover plate portion that can engage with the edge of the opening of the beverage container when the cover plate portion is made to cover the opening of the beverage container, wherein the lid further comprises a drinking spout forming line portion that is provided on the outer periphery of the cover plate portion and is shaped like the peripheral side of the drinking spout for forming a drinking spout, the drinking spout forming line portion being a low-strength portion that is weaker than the general part of the cover plate portion, and when the drinking spout forming area surrounded by the drinking spout forming line portion is pressed from above, the drinking spout forming portion on the outer periphery of the cover plate portion in the drinking spout forming area is and a low-strength folding section having a lower strength than the general section of the cover plate to facilitate folding by a valley fold between the outer section for forming the drinking spout and the inner section for forming the drinking spout inside the cover plate; and an engaging section which can engage with a locking section on the periphery of the outer section for forming the drinking spout when the inner section for forming the drinking spout is folded over and the outer section for forming the drinking spout is raised by a valley fold as the inner section for forming the drinking spout is mountain-folded, and the outer section for forming the drinking spout and the inner section for forming the drinking spout are folded over, and the outer section for forming the drinking spout has a lift-promoting section which is a low-strength section having a lower strength than the general section of the outer section for forming the drinking spout or a cut-out section.

[0010] The lid for a paper beverage container according to the second invention is the lid for a paper beverage container according to the first invention, characterized in that the lifting promotion portion is disposed in the center of the outer region for forming the drinking spout.

[0011] The lid for a paper beverage container according to the third invention is characterized in that, in the first or second invention, the outer region for forming the drinking spout has a lifting promotion auxiliary portion around the lifting promotion portion, which is made of a low-strength portion or a cut portion that is weaker than the general portion of the outer region for forming the drinking spout.

[0012] The lid for a paper beverage container according to the fourth invention is characterized in that, in any of the first to third inventions, a low-strength mountain-folding portion is provided between the inner ends of the drinking spout-forming line portion in the drinking spout-forming portion of the cover plate portion, the low-strength portion having lower strength than the general portion of the cover plate portion to facilitate mountain-folding of the drinking spout-forming inner portion.

[0013] The lid for a paper beverage container according to the fifth invention is the lid for a paper beverage container according to the fourth invention, characterized in that the low strength portion for mountain folding is formed by providing perforations.

[0014] The lid for a paper beverage container according to a sixth invention is any one of the first to fifth inventions, characterized in that the low strength folding portion is formed by providing perforations.

[0015] The lid for a paper beverage container according to the seventh invention is characterized in that, in any of the first to sixth inventions, the locking portion is formed in a narrowed portion of the widened portion obtained by widening the end portion on the outer edge side of the cover plate portion on the side of the outer region for forming the drinking spout, and is capable of engaging with the edge of the drinking spout as the engaging portion.

[0016] The lid for a paper beverage container according to the eighth invention is characterized in that, in any of the first to sixth inventions, the locking portion is formed as a notch at the end portion on the outer edge side of the cover plate portion on the side of the outer area for forming the drinking spout, and the edge of the drinking spout can be engaged as the engaging portion.

[0017] The lid for a paper beverage container according to a ninth aspect of the present invention is any one of the first to eighth aspects of the present invention, characterized in that a plurality of the locking portions are provided.

[0018] The lid for a paper beverage container according to the tenth invention is characterized in that, in any of the first to ninth inventions, the drinking spout forming line portion consists of a cut line portion, and the side portion of the outer part for forming the drinking spout and the cover plate portion around the side portion of the outer part for forming the drinking spout are connected by one or more connecting portions.

[0019] The method for forming a drinking spout on a lid for a paper beverage container according to an eleventh aspect of the present invention is a method for forming a drinking spout on a lid for a paper beverage container according to any one of the first to tenth aspects of the present invention, and includes the steps of pressing the drinking spout-forming portion from above with a finger, and folding the drinking spout-forming outer portion and the drinking spout-forming inner portion of the drinking spout-forming portion by a valley fold with a finger, and valley The drinking spout is formed by a step of folding and lifting, and a step of engaging the locking portion on the periphery of the outer portion for forming the drinking spout with the engaging portion with a finger.

[0020] A paper beverage container according to a twelfth aspect of the present invention is characterized by comprising a paper beverage container lid according to any one of the first to tenth aspects of the present invention. [Effects of the Invention]

[0021] According to the present invention having the above-described configuration, a drinking spout that makes it easy to drink a beverage can be formed without using a straw and without removing the container from the beverage container. [Brief explanation of the drawings]

[0022] [Figure 1] FIG. 1 is an exploded perspective view of a paper beverage container according to a first embodiment of the present invention. [Figure 2] 2(a) and 2(b) are explanatory views showing a stage before forming the drinking spout in the method for forming the drinking spout of a paper beverage container lid according to the first embodiment of the present invention. [Figure 3] 3(a) and 3(b) are explanatory views showing stages in the process of forming a drinking spout in the method for forming a drinking spout on a paper beverage container lid according to the first embodiment of the present invention. [Figure 4]4(a) and 4(b) are explanatory views showing a stage after the formation of the drinking spout in the method for forming a drinking spout on a paper beverage container lid according to the first embodiment of the present invention. [Figure 5] 5(a) to 5(c) are explanatory diagrams showing the stress distribution in the outer region for forming the drinking spout relative to the length of the lifting promoting portion of the paper beverage container lid according to the first embodiment of the present invention. [Figure 6] 6(a) to 6(c) are explanatory diagrams showing the amount of sinking of the outer region for forming the drinking spout relative to the length of the lifting promoting portion of the paper beverage container lid according to the first embodiment of the present invention. [Figure 7] FIG. 7 is a schematic diagram showing the relationship between the support point, the point of application, and the point of force in the lid for a paper beverage container according to the first embodiment of the present invention. [Figure 8] FIG. 8 is an enlarged view of a main part of a lid for a paper beverage container according to a second embodiment of the present invention. [Figure 9] 9(a) to 9(c) are explanatory diagrams showing stress distribution in the outer region for forming the drinking spout relative to the position of the lifting promoting portion of the lid for a paper beverage container according to the second embodiment of the present invention. [Figure 10] 10(a) to 10(c) are explanatory diagrams showing the amount of sinking of the outer region for forming the drinking spout relative to the position of the lifting promoting portion of the paper beverage container lid according to the second embodiment of the present invention. [Figure 11] 11(a) to 11(d) are enlarged views of the main part of a lid for a paper beverage container according to a third embodiment of the present invention. [Figure 12] Figures 12(a) to 12(d) are explanatory diagrams showing the stress distribution in the outer region for forming the drinking spout for paper beverage container lids relating to embodiment 3 of the present invention, where the angle of the lifting promotion auxiliary section added based on the folding low strength section is different. [Figure 13] FIG. 13 is an enlarged view of a main part of a lid for a paper beverage container according to a third embodiment of the present invention, which is provided with more lifting promotion auxiliary portions. [Figure 14] 14(c) to 14(e) are diagrams showing the main parts of lids for paper beverage containers according to the present invention, each having a different arrangement pattern of lifting promotion portions. [Figure 15]1 is an enlarged view of a main part of a lid for a paper beverage container in accordance with the present invention, in which a locking portion is formed as a notch and a connecting portion is added. [Figure 16] 1 is an enlarged view of a main part of a lid for a paper beverage container according to the present invention, in which the low-strength folding portion has an arc shape that bulges toward the outer region for forming the drinking spout. [Figure 17] 17 is an explanatory view showing the stage after the formation of the drinking spout of the paper beverage container lid shown in FIG. 16. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0023] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

[0024] [Embodiment 1] First, a paper beverage container 2 according to a first embodiment of the present invention will be described with reference to Fig. 1. Fig. 1 is an exploded perspective view of a paper beverage container 2 according to an embodiment of the present invention.

[0025] As shown in Figure 1, the paper beverage container 2 according to embodiment 1 of the present invention is a cylindrical paper cup with a bottom, which has an opening 3 with a rim 3a at its top and is often used to store and sell beverages 6 such as juice or coffee.

[0026] The paper beverage container 2 is used for selling a beverage 6 by closing the opening 3 with the paper beverage container lid 1. The beverage container whose opening 3 is closed with the paper beverage container lid 1 is not limited to the paper beverage container 2, but may be made of other materials such as plastic. If the beverage container is made of plastic, it is preferable to use an environmentally friendly biodegradable plastic.

[0027] The lid 1 for a paper beverage container comprises a disk-shaped cover plate portion 4 that covers the opening 3 of the paper beverage container 2, and a side peripheral portion 5 that is provided on the outer peripheral edge of the cover plate portion 4 and can engage with the edge portion 3a of the opening 3 of the beverage container 2 when the cover plate portion 4 is arranged to cover the opening 3 of the beverage container 2.

[0028] The cover plate 4 is provided on its peripheral side with a drinking spout forming line 11, which is made up of a roughly U-shaped cut line 12 and connecting portions 11a, 11b, and which is the shape of the peripheral side of the drinking spout 110 for forming the drinking spout 110 (see also Figure 4). Note that this drinking spout forming line 11 may be implemented by providing a low-strength portion that is weaker than the general portion of the cover plate 4, by providing perforations or reducing the thickness by half-cutting, etc., instead of a cut line.

[0029] In addition, when the drinking spout forming areas 11A, 11B surrounded by the drinking spout forming line portion 11 of the cover plate portion 4 are pressed from above, a low-strength folding portion 13 having lower strength than the general portion of the cover plate portion 4 is provided to facilitate folding by a valley fold between the drinking spout forming outer area 11A on the outer edge side of the cover plate portion 4 and the drinking spout forming inner area 11B inside the cover plate portion 4 in the drinking spout forming areas 11A, 11B.

[0030] Specifically, the folding low-strength portion 13 is formed by providing perforations. Note that the folding low-strength portion 13 can also be provided by reducing the thickness, such as by half-cutting.

[0031] In addition, a low-strength mountain-folding portion 14 having lower strength than the general portion of the cover plate portion 4 is provided between the inner ends of the drinking spout-forming line portion 11 in the drinking spout-forming inner portion 11B of the cover plate portion 4 to facilitate mountain-folding of the drinking spout-forming inner portion 11B.

[0032] Specifically, the mountain-folding low-strength portion 14 is formed by providing perforations. Note that the mountain-folding low-strength portion 14 may be provided by providing a ruled line, by reducing the thickness by half-cutting, or the like, or may be provided without providing any.

[0033] Furthermore, the outer region 11A for forming the drinking spout is raised by a valley fold, and a locking portion 11c is provided on the periphery of the outer region 11A for forming the drinking spout when the outer region 11A for forming the drinking spout and the inner region 11B for forming the drinking spout are folded together, and an engaging portion is provided that can engage with this locking portion 11c.

[0034] Specifically, the engaging portion 11c is formed in the narrowed portion of the widened portion formed by widening the end portion on the outer peripheral edge side of the cover plate portion 4 at the side of the outer portion 11A for forming the drinking spout in an approximately semi-cylindrical shape, and is capable of engaging with the edge of the drinking spout 110 as an engaging portion (see also Figure 4).

[0035] Furthermore, the outer region 11A for forming the drinking spout and the cover plate 4 around the sides of the outer region 11A for forming the drinking spout are connected by left and right connecting portions 11a, and the inner region 11B for forming the drinking spout and the cover plate 4 around the sides of the inner region 11B for forming the drinking spout are connected by left and right connecting portions 11e, so that the outer region 11A for forming the drinking spout and the inner region 11B for forming the drinking spout do not sink due to their own weight, etc. The number and positions of these connecting portions 11a and 11e are not limited to those described above.

[0036] Furthermore, the outer region 11A for forming the drinking spout has a lifting promoting portion 11d formed by a cut line extending from the center of the folding low strength portion 13 toward the tip of the outer region 11A for forming the drinking spout.

[0037] The lifting-promoting portion 11d is not limited to a cut line, and may be a cut portion of another shape, a low-strength portion that is weaker than the general portion of the outer spout-forming portion 11A, etc. Furthermore, the lifting-promoting portion 11d may be disposed anywhere within the outer spout-forming portion 11A.

[0038] Next, a method for forming a drinking spout on a lid 1 for a paper beverage container according to embodiment 1 of the present invention will be described with reference to Figures 2 to 4. Figures 2 to 4 are explanatory diagrams showing, in stages, a method for forming a drinking spout on a lid 1 for a paper beverage container according to embodiment 1 of the present invention.

[0039] First, as shown in Figures 2(a) and 2(b) to 3(a) and 3(b), when the inner region 11B for forming the drinking spout is pressed from above with a finger F1 such as the thumb or index finger, a valley fold is formed between the outer region 11A for forming the drinking spout and the inner region 11B for forming the drinking spout at the low-strength folding portion 13.

[0040] Furthermore, the outer portion 11A for forming the drinking spout is pressed against the outer portion 11A of the cover plate 4 with a finger F1 such as the thumb or index finger. When the bottle is pushed inward, the inner portion 11B for forming the drinking spout is further folded inward. The outer part 11A for mouth formation is Low strength section for folding 13 It is further folded at this point and raised even further.

[0041] In this case, as will be described in detail later, by having the lifting-promoting portion 11d, stress acts to lift the outer portion 11A for forming the drinking spout as shown in Figure 5(b), and a triangular sinking deformation occurs that tries to lift the outer portion 11A for forming the drinking spout as shown in Figure 6(b), making it possible to easily lift the tip side of the outer portion 11A for forming the drinking spout upward.

[0042] Then, as shown in Figures 4(a) and 4(b), when the outer part 11A for forming the drinking spout is further pushed inward into the cover plate part 4 with a finger F1 such as the thumb or index finger, the outer part 11A for forming the drinking spout and the inner part 11B for forming the drinking spout are folded in a mountain fold, and the engaging part 11c of the outer part 11A for forming the drinking spout engages with the edge of the drinking spout 110, which is the engaging part, thereby forming the drinking spout 110.

[0043] According to the embodiment 1 of the present invention described above, the above-mentioned configuration makes it possible to form a drinking spout 110 that makes it easy to drink the beverage 6 without using a straw and without removing the paper beverage container lid 1 from the paper beverage container 2.

[0044] Furthermore, in embodiment 1 of the present invention, since both the paper beverage container lid 1 and the paper beverage container 2 are made of paper, it is possible to eliminate plastic almost entirely, except for the adhesives used.

[0045] Furthermore, according to the method for forming the drinking spout 110 of the lid 1 for a paper beverage container according to the first embodiment of the present invention, the drinking spout 110 of the lid 1 for a paper beverage container can be easily formed by the simple procedure described above.

[0046] In particular, the paper beverage container lid 1 according to embodiment 1 of the present invention has a lifting promotion portion 11d in the outer region 11A for forming the drinking spout, so that, as described above, the drinking spout 110 of the paper beverage container lid 1 can be formed more easily.

[0047] [Example 1] The following describes the results of an experiment conducted to confirm the effects of embodiment 1 of the present invention. In the experiment, specimens of invention examples 1 to 3 shown in Figures 5(a) to 5(c) and 6(a) to 6(c) were prepared to confirm the difference in the amount of lifting of the tip end side of the outer region 11A for forming the spout caused by varying the length of the lifting-promoting portion 11d.

[0048] First, the stress distribution when the inner part 11B for forming the drinking spout is pressed with the same force was verified, and the results are shown by arrows.

[0049] As shown in Figure 5(a), in Example 1 of the present invention, where the tip of the lifting promotion portion 11d is short enough not to reach the space between the connecting portions 11a, 11a, a large amount of stress acts in the approximately vertical direction toward the short lifting promotion portion 11d and both ends of the low-strength folding portion 13, so the outer portion 11A for forming the drinking spout is lifted more vertically.

[0050] As shown in Figure 5(b), in Example 2 of the present invention, in which the tip of the lifting-promoting portion 11d is long enough to extend beyond the space between the connecting portions 11a, 11a but not reach the tip of the outer portion 11A for forming the drinking spout, a large amount of pulling stress acts not only vertically but also horizontally toward the long lifting-promoting portion 11d and both ends of the low-strength folding portion 13, so that the outer portion 11A for forming the drinking spout is lifted in a balanced manner in both the vertical and horizontal directions.

[0051] As shown in Figure 5(c), in Example 3 of the present invention, in which the tip of the lifting-promoting portion 11d has the maximum length, reaching the tip of the outer portion 11A for forming the drinking spout, similar to Example 2 of the present invention, a large amount of pulling stress acts not only vertically but also horizontally toward the long lifting-promoting portion 11d and both ends of the low-strength folding portion 13, so that the outer portion 11A for forming the drinking spout is lifted in a balanced manner in both the vertical and horizontal directions.

[0052] Since it is not possible to determine whether the product is good or bad based on the stress distribution alone, the amount of sinking of the outer portion 11A for forming the drinking spout when such stress is applied was examined, and the results were shown.

[0053] As shown in FIG. 6(a), in Example 1 of the present invention, only a triangular sinking amount with a small area connecting both ends of the folding low-strength portion 13 and the tip of the lift-promoting portion 11d was obtained.

[0054] As shown in FIG. 6(b), in Example 2 of the present invention, a triangular sinking amount with a relatively wide area connecting both ends of the folding low-strength portion 13 and the tip of the lift-promoting portion 11d was obtained.

[0055] 6(c), in Example 3 of the present invention, a relatively wide triangular sinking amount was obtained connecting both ends of the folding low-strength portion 13 and the tip of the lift-promoting portion 11d. However, in Example 3 of the present invention, the tip of the lift-promoting portion 11d reaches the tip of the outer spout-forming portion 11A and is cut off, so the middle part of the outer spout-forming portion 11A appears to be bent in a mountain shape.

[0056] As a result, it was found that the longer the length of the lifting-promoting portion 11d, the easier it was to lift the outer spout-forming portion 11A. However, it was also found that if the tip of the lifting-promoting portion 11d reaches the tip of the outer spout-forming portion 11A and is cut off, the middle part of the outer spout-forming portion 11A will bend in a mountain-like shape.

[0057] Furthermore, based on the principle of leverage, as shown in Figure 7, if the connecting portion 11a is taken as the fulcrum P1, the portion above the tip of the lifting promotion portion 11d is taken as the point of action P2, and both ends of the folding low-strength portion 13 are taken as the force points P3, the following can be seen.

[0058] The closer the fulcrum P1 is to the point of application P2, the easier it is to lift the outer region 11A for forming the drinking spout with a smaller force. Also, the farther the point of application P2 is from the point of application P2 to the point of application P3 than to the fulcrum P1, the easier it is to lift the outer region 11A for forming the drinking spout with a smaller force. In other words, it is advisable to design the lid 1 for a paper beverage container according to embodiment 1 with this in mind.

[0059] [Embodiment 2] Next, a paper beverage container lid 1 according to a second embodiment of the present invention will be described using Figure 8. Figure 8 is an enlarged view of a main part of the paper beverage container lid 1 according to the second embodiment of the present invention. The difference from the paper beverage container lid 1 according to the first embodiment described above is mainly the position of the lifting promotion portion 11d, so this point will be mainly described, and the same components will be given the same reference numerals and their description will be omitted.

[0060] The lid 1 for paper beverage containers of this embodiment 2 differs from the lid 1 for paper beverage containers of embodiment 1 in that, as shown in Figure 8, the lower end of the lifting promotion portion 11d consisting of a cut line is separated from the low strength portion 13 for folding.

[0061] In the paper beverage container lid 1 of this embodiment 2, even if the lower end of the lifting-promoting portion 11d consisting of the cut line is separated from the folding low-strength portion 13, pressing the inner portion 11B for forming the drinking spout promotes the lifting of the outer portion 11A for forming the drinking spout, in much the same way as the paper beverage container lid 1 of embodiment 1, making it easier to form the drinking spout 110 of the paper beverage container lid 1.

[0062] [Example 2] The following describes the results of an experiment conducted to confirm the effects of embodiment 2 of the present invention. In the experiment, specimens of invention examples 4 to 6 shown in Figures 9(a) to 9(c) and 10(a) to 10(c) were prepared to confirm the difference in the amount of lifting of the tip end side of the outer spout-forming region 11A caused by varying the position of the lifting-promoting portion 11d.

[0063] First, the stress distribution when the inner part 11B for forming the drinking spout is pressed with the same force was verified, and the results are shown by arrows.

[0064] As shown in Figure 9(a), in Example 4 of the present invention, where the tip of the lifting promotion portion 11d is positioned so as not to reach the space between the connecting portions 11a, 11a, a large amount of stress acts in the approximately vertical direction toward the lifting promotion portion 11d and both ends of the low-strength folding portion 13, causing the outer portion 11A for forming the drinking spout to be lifted more vertically.

[0065] As shown in Figure 9(b), in Example 5 of the present invention, where the tip of the lifting-promoting portion 11d is positioned to straddle the connecting portions 11a, 11a, a large amount of pulling stress acts not only vertically but also horizontally toward the lifting-promoting portion 11d and both ends of the low-strength folding portion 13, so that the outer portion 11A for forming the drinking spout is lifted in a balanced manner in both the vertical and horizontal directions.

[0066] As shown in Figure 9(c), in Example 6 of the present invention, where the rear end of the lifting-promoting portion 11d is positioned beyond the connecting portions 11a, 11a toward the tip side of the outer portion 11A for forming the drinking spout, similarly to Example 5 of the present invention, a large amount of pulling stress acts not only vertically but also horizontally toward the lifting-promoting portion 11d and both ends of the low-strength portion 13 for folding, so that the outer portion 11A for forming the drinking spout is lifted in a balanced manner in both the vertical and horizontal directions.

[0067] In addition to these stress distributions, the amount of sinking of the outer portion 11A for forming the drinking spout when such stresses are applied was examined, and the results were shown.

[0068] As shown in FIG. 10(a), in Example 4 of the present invention, only a triangular sinking amount with a small area connecting both ends of the folding low-strength portion 13 and the tip of the lifting promoting portion 11d was obtained.

[0069] As shown in FIG. 10(b), in Example 5 of the present invention, a triangular sinking amount with a relatively wide area connecting both ends of the folding low-strength portion 13 and the tip of the lift-promoting portion 11d was obtained.

[0070] As shown in FIG. 10(c), in Example 6 of the present invention, a triangular sinking amount with a relatively wide area connecting both ends of the folding low-strength portion 13 and the tip of the lift-promoting portion 11d was obtained.

[0071] In Examples 4 to 6 of the present invention, the dotted line portion on the rear end side of the lifting promoting portion 11d in Figs. 10(a) to 10(c) was also bent and deformed.

[0072] As a result, it was found that the outer region 11A for forming the drinking spout is more easily lifted the farther the tip of the lifting promoting portion 11d is positioned from the low-strength folding portion 13. However, it was also found that the lid 1 for a paper beverage container according to embodiment 1, in which the rear end of the lifting promoting portion 11d is connected to the low-strength folding portion 13, promotes the lifting of the outer region 11A for forming the drinking spout, and makes it easier to form the drinking spout 110 of the lid 1 for a paper beverage container, than the lid 1 for a paper beverage container according to embodiment 2.

[0073] [Embodiment 3] Next, a paper beverage container lid 1 according to a third embodiment of the present invention will be described using Figures 11(a) to 11(d). Figures 11(a) to 11(d) are enlarged views of the main parts of the paper beverage container lid 1 according to the third embodiment of the present invention. The difference from the paper beverage container lid 1 according to the first embodiment described above is mainly that it has lift-up promotion auxiliary parts 11f on the left and right of the lift-up promotion part 11d, so this point will be mainly described, and the same components will be given the same reference numerals and their description will be omitted.

[0074] The paper beverage container lid 1 according to the third embodiment differs from the paper beverage container lid 1 according to the first embodiment in that it has lifting promotion auxiliary portions 11f symmetrically arranged on the left and right sides of the lifting promotion portion 11d consisting of a cut line, as shown in Figures 11(a) to 11(d). Note that the lifting promotion auxiliary portions 11f are not limited to cut lines, and may be cut portions of other shapes or low-strength portions that are weaker than the general portion of the outer region 11A for forming the drinking spout. Furthermore, the lifting promotion auxiliary portions 11f may be arranged anywhere within the outer region 11A for forming the drinking spout.

[0075] In Figure 11(a), the lifting promotion auxiliary part 11f is at 0° with respect to the folding low-strength part 13, in Figure 11(b), the lifting promotion auxiliary part 11f is at 50° with respect to the folding low-strength part 13, in Figure 11(c), the lifting promotion auxiliary part 11f is at 90° with respect to the folding low-strength part 13, and in Figure 11(d), the lifting promotion auxiliary part 11f is at 130° with respect to the folding low-strength part 13.

[0076] In the paper beverage container lid 1 according to the third embodiment, by adding a lifting promotion auxiliary portion 11f to the lifting promotion portion 11d, the lifting of the drinking spout-forming outer portion 11A is promoted more than in the paper beverage container lid 1 according to the first embodiment, and the drinking spout 110 can be formed even more easily. Note that, as shown in Figure 11(a), the drinking spout 110 could not be formed only when the lifting promotion auxiliary portion 11f was provided at 0° with respect to the folding low-strength portion 13.

[0077] [Example 3] The following describes the results of an experiment conducted to confirm the effects of embodiment 3 of the present invention. In the experiment, test specimens of invention examples 7 to 9 shown in Figures 11(a) to 11(d) and 12(a) to 12(d) were prepared to confirm the difference in the amount of lifting of the tip end side of the outer spout-forming region 11A caused by varying the angle of the lifting promotion auxiliary portion 11f added to the lifting promotion portion 11d.

[0078] First, the stress distribution when the inner part 11B for forming the drinking spout is pressed with the same force was verified, and the results are shown by arrows.

[0079] As a result, it was found that the paper beverage container lid 1 according to embodiment 3 more effectively promotes the lifting of the drinking spout-forming outer region 11A than the paper beverage container lid 1 according to embodiment 1, making it even easier to form the drinking spout 110 of the paper beverage container lid 1. Furthermore, it was also found that in the paper beverage container lid 1 according to embodiment 3, the larger the angle of the lifting promotion assisting portion 11f relative to the folding low strength portion 13, the more effectively it promotes the lifting of the drinking spout-forming outer region 11A, making it even easier to form the drinking spout 110 of the paper beverage container lid 1. Note that only when the lifting promotion assisting portion 11f was provided at an angle of 0° relative to the folding low strength portion 13 did stress to lift the drinking spout-forming outer region 11A, as shown by the dotted arrow in Figure 12(a), occur, and the drinking spout 110 could not be formed.

[0080] Also, as shown in FIG. 13, more lifting promotion auxiliary portions 11f may be provided.

[0081] Although the 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 embodied 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 modifications are included within the scope and spirit of the invention, and are also included in the inventions and their equivalents as defined in the claims.

[0082] For example, in the paper beverage container lid 1 of the present invention, the lifting promoting portion 11d can be arranged in various forms as shown in Figs. 14(a) to 14(f).

[0083] Specifically, the paper beverage container lid 1 in Figures 14(a) and 14(b) has a wave-shaped lifting promotion portion 11d. The paper beverage container lid 1 in Figures 14(c) to 14(e) has a plurality of lifting promotion portions 11d arranged vertically. The paper beverage container lid 1 in Figure 14(f) has a lifting promotion portion 11d arranged diagonally from one end of the folding low-strength portion 13.

[0084] Also, in Figure 15, in the lid 1 for a paper beverage container of the present invention, the locking portion 11c is formed as a notch, and the edge of the drinking spout 110 is used as an engaging portion to enable stronger engagement, and further, an additional connecting portion 11b is provided at the tip of the outer portion 11A for forming the drinking spout, increasing the supporting force of the outer portion 11A for forming the drinking spout before the drinking spout 110 is formed.

[0085] Furthermore, in Figure 16, in the paper beverage container lid 1 of the present invention, the folding low strength portion 13 is made into an arc shape that bulges toward the outer region 11A for forming the drinking spout, so that even if a finger accidentally presses the outer region 11A for forming the drinking spout instead of the inner region 11B for forming the drinking spout, the drinking spout 110 of the paper beverage container lid 1 can be easily formed.

[0086] 17, however, in this paper beverage container lid 1, the outer region 11A for forming the drinking spout and the inner region 11B for forming the drinking spout are connected to the cover plate 4 around the sides of the inner region 11B for forming the drinking spout by left and right connecting portions 11e, and the low-strength folding portion 13 has an arc shape that bulges toward the outer region 11A for forming the drinking spout, making it easy to grip with fingers. Therefore, this paper beverage container lid 1 is folded in a mountain fold rather than a valley fold, and with the tip of the outer region 11A for forming the drinking spout facing downward, the locking portion 11c engages with the edge of the drinking spout 110, which is the engaging portion, to form the drinking spout 110, and the shape after the drinking spout 110 is formed also differs from that of the paper beverage container lid 1 according to the first embodiment.

[0087] In addition, in a lid 1 for a paper beverage container with such measures, the folding low strength portion 13 is not limited to an arc shape, and may be implemented in any shape as long as it is bulged toward the outer portion 11A for forming the drinking spout. [Explanation of symbols]

[0088] 1. Paper beverage container lids 110 Drinking spout 11 Line part for forming spout 11A Outer part for forming mouthpiece 11B Inner part for forming mouthpiece 11a Connecting part 11b Connecting part 11e Connecting part 11c Locking part 11d Lifting promotion part 11f Lifting promotion auxiliary part 12 Cut line section 13 Low strength section for folding 14 Low strength section for mountain folding 2. Paper beverage containers 3 Opening 3a Edge of opening 4 Cover plate part 5 Side circumference 6 Beverages F1 finger P1 fulcrum P2 Point of action P3 Focus

Claims

1. A lid for a paper beverage container comprising: a cover plate portion that covers an opening of a beverage container; and a side periphery portion that is provided on the outer periphery of the cover plate portion and that can engage with the edge of the opening of the beverage container when the cover plate portion covers the opening of the beverage container, A drinking spout forming line portion is provided on the peripheral side of the cover plate portion and is the shape of the peripheral side of the drinking spout for forming the drinking spout, and is made of a low-strength portion having lower strength than the general portion of the cover plate portion; a low-strength folding portion having a lower strength than the general portion of the cover plate portion, for facilitating a valley fold between the outer portion for forming the drinking spout on the outer peripheral edge side of the cover plate portion and the inner portion for forming the drinking spout on the inside of the cover plate portion when the drinking spout forming portion surrounded by the drinking spout forming line portion is pressed from above; The drinking spout-forming inner part is folded in a mountain fold, and the drinking spout-forming outer part is folded in a valley fold and raised, and further, an engaging part is provided that can engage with a locking part on the periphery of the drinking spout-forming outer part when the drinking spout-forming outer part and the drinking spout-forming inner part are folded, The outer portion for forming the drinking spout has a lift-promoting portion consisting of a low-strength portion or a cut portion that is weaker than the general portion of the outer portion for forming the drinking spout. A lid for a paper beverage container, characterized by:

2. The lifting promotion portion is disposed in the center of the outer portion for forming the drinking spout. The lid for a paper beverage container according to claim 1,

3. The outer portion for forming the drinking spout has a lifting promotion auxiliary portion around the lifting promotion portion, which is made of a low-strength portion or a cut portion that is weaker than the general portion of the outer portion for forming the drinking spout. The lid for a paper beverage container according to claim 1 or 2, characterized in that

4. A low-strength mountain-folding portion having a lower strength than the general portion of the cover plate portion is provided between the inner ends of the drinking spout-forming line portion in the drinking spout-forming portion of the cover plate portion to facilitate mountain-folding of the drinking spout-forming inner portion. The lid for a paper beverage container according to any one of claims 1 to 3, characterized in that

5. The mountain-folding low-strength portion is formed by providing perforations. The lid for a paper beverage container according to claim 4, characterized in that

6. The folding low strength portion is formed by providing perforations. The lid for a paper beverage container according to any one of claims 1 to 5, characterized in that

7. The engaging portion is formed at a narrowed portion of a widened portion formed by widening an end portion of the outer peripheral edge of the cover plate portion at the side of the outer region for forming the drinking spout, and is capable of engaging with the edge of the drinking spout as the engaging portion. The lid for a paper beverage container according to any one of claims 1 to 6, characterized in that

8. The engaging portion is formed as a notch at the end of the outer peripheral edge of the cover plate portion on the side of the outer portion for forming the drinking spout, and is capable of engaging with the edge of the drinking spout as the engaging portion. The lid for a paper beverage container according to any one of claims 1 to 6, characterized in that

9. The locking portion is provided in plurality. The lid for a paper beverage container according to any one of claims 1 to 8, characterized in that

10. The drinking spout forming line portion is made of a cut line portion, The side portion of the outer portion for forming the drinking spout and the cover plate portion around the side portion of the outer portion for forming the drinking spout are connected by one or more connecting portions. The lid for a paper beverage container according to any one of claims 1 to 9, characterized in that

11. A method for forming a drinking spout on a lid for a paper beverage container according to any one of claims 1 to 10, A step of pressing the drinking spout forming portion from above with a finger; A step of folding the outer portion for forming the drinking spout and the inner portion for forming the drinking spout together with fingers, and lifting the outer portion for forming the drinking spout by folding it in a valley; and engaging the engaging portion of the outer edge of the drinking spout forming portion with a finger, thereby forming the drinking spout. A method for forming a drinking spout on a lid for a paper beverage container, comprising:

12. The paper beverage container lid according to any one of claims 1 to 10 is provided. A paper beverage container characterized by:

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