Lid

Abstract

To provide a lid body that can reduce the burst of contents from a through hole due to a simple structure thereof, even when formed using paper material.SOLUTION: A lid body includes: a canopy part 2 made of paper-based material formed to open and close the mouth of a container for storing liquid, and having a through hole formed through the inside and outside; a side wall part 3 made of paper-based material formed to surround the canopy part 2; and an inner member 4 formed on the lower surface side of the canopy part 2, the inner member 4 having an insertion portion 7, which leads to the canopy part 2 and the inner surface side of the container, and a liquid-avoiding wall 8 formed around the insertion portion 7.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a lid body.

Background Art

[0002] Conventionally, in stores such as convenience stores and supermarkets, various food and beverage products such as beverages like coffee and prepared foods are widely sold by putting them in simple containers. For example, in convenience stores, beverages such as coffee are put into cup-shaped containers made of paper or plastic and sold on the spot. In recent years, there has also been an increasing trend to sell by using a delivery service that delivers store products to the desired location of the purchaser. When a liquid substance is contained in a container, there is a concern that the liquid substance may leak out of the container during carrying. Therefore, conventionally, a lid has been attached to the mouth of the container to prevent the contents such as the liquid substance from leaking out during carrying. As a lid for a container, for example, there is one disclosed in Patent Document 1 shown below. This lid is formed of a paper material and includes a side wall portion formed to have a wall surface portion that engages with the inner surface of a container having a frustum of a cone shape such as a paper cup when the lid is closed, and a canopy portion surrounded by this side wall portion.

[0003] Generally, when forming such a lid, when the content put into the container is particularly hot, there is a problem that the lid is likely to come off due to an increase in the internal pressure in the container when the lid is closed. Therefore, many lids have holes formed through the canopy portion to reduce the increase in internal pressure. However, especially when the content is a liquid substance such as coffee, the container often shakes during carrying, and the content also shakes along with the shaking. Therefore, there was a high possibility of a problem that the shaken content would spurt out from the above-mentioned holes.

[0004] To solve these problems, there is a lid disclosed in Patent Document 2 shown below. The lid disclosed in Patent Document 2 has a liquid-proof wall portion that prevents the contents from rising along the side wall of the container and from splashing back, and a through hole is formed on the inside of this liquid-proof wall portion. Furthermore, this lid is molded from a synthetic resin, and the liquid-proof wall portion is formed directly on the top portion by forming a recess in the top portion. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2006-248530 [Patent Document 2] Patent No. 4943685 [Overview of the project] [Problems that the invention aims to solve]

[0006] The lid disclosed in Patent Document 2, mentioned above, was able to solve problems such as the ejection of contents from through holes to some extent by forming a liquid-proof wall. However, because it is mainly made of synthetic resin, it contradicts the recent efforts to address environmental issues. In this regard, various biodegradable plastic materials, which are said to be environmentally friendly, have been developed, and it is becoming possible to manufacture environmentally conscious lids using biodegradable plastic materials. However, biodegradable plastic materials are more expensive than conventionally used plastic materials, and the manufacturing cost increases with the amount used. In particular, because the volume of lids in circulation is extremely large, even if the increase in manufacturing cost per lid is small, the increase in manufacturing cost becomes enormous when dealing with a large number of lids. For this reason, applying expensive biodegradable plastic materials to lids as a countermeasure against environmental issues has not been realistic at present.

[0007] To solve these problems, it is conceivable to use paper material as the material for forming the lid, as in the lid disclosed in Patent Document 1 mentioned above. However, since paper material is difficult to mold and process freely like plastic material, it is not easy to provide an inexpensive lid using paper material that is highly airtight and can prevent spills from through holes formed in the lid.

[0008] This invention has been made in view of these problems, and aims to provide a lid that can significantly reduce the ejection of contents from through holes with a simple structure, even when formed using paper material. [Means for solving the problem]

[0009] The present invention (1) A lid for closing the opening of a container for storing liquids, comprising a top part made of a paper-based material having through holes that penetrate from the inside to the outside, It is formed separately from the aforementioned canopy section. A lid comprising: an internal member provided on the lower surface side of the lid portion, wherein the internal member comprises an insertion portion that communicates with the lid portion and the inner surface side of the container, and a liquid-receiving wall formed around the insertion portion, wherein the insertion portion is formed as an opening, the through hole is formed to be smaller than the insertion portion, the liquid-receiving wall is formed to completely surround the periphery of the insertion portion and is formed continuously in the circumferential direction, and further protrudes from the surface of the internal member toward the inner surface side of the container, and the lower end of the liquid-receiving wall is configured to be located below the position of the through hole. (2) The insertion portion is provided in a position that overlaps with the position of the through hole formed in the top cover portion, the lid as described in (1) above. (3) The lid according to (1) or (2) above, comprising a side wall formed surrounding the canopy portion, wherein the side wall is made of a blank material made of paper. (4) A lid according to any one of (1) to (3) above, wherein a plurality of through holes are formed and the liquid-receiving wall is formed for each of the plurality of through holes, (5) The lid according to any one of (1) to (4) above, wherein the top part has a drinking spout opening, the inner member has a drinking spout insertion part formed at a position overlapping with the drinking spout, and a drinking spout liquid-relieving wall is formed around the drinking spout insertion part. (6) The lid described in (3) above, wherein the lower end position of the liquid-receiving wall is at the same position as the lower end position of the side wall or is located above the lower end position of the side wall. (7) The lid according to any one of (1) to (6) above, the through hole includes one of the following: an insertion hole formed to allow a straw-like object to be inserted, an outlet hole for releasing gas from inside the container to the outside when the lid is closed, or an outlet hole for draining liquid from inside the container when the lid is closed. (8) The lid according to any one of (1) to (7) above, wherein the top portion has a top surface, the top portion has a surface, and the surface is formed in a planar shape. (9) The lid according to any one of (1) to (8) above, wherein the lower end of the liquid-receiving wall is configured to be continuously connected. This is the gist of it. [Effects of the Invention]

[0010] The lid according to the present invention is a lid for closing the opening of a container that stores liquid, and comprises a top part made of a paper-based material with a through hole formed therethrough that penetrates from the inside to the outside, and an inner member provided on the lower side of the top part, wherein the inner member comprises an insertion part that communicates with the top part and the inner surface of the container, and a liquid-receiving wall formed around the insertion part. Therefore, even if the liquid stored inside the container shakes and the liquid level rises along the inner wall of the container, or if waves generated by the shaking of the liquid collide with each other to create larger waves or splashes, the liquid-receiving wall prevents the liquid from reaching the through hole and leaking out from the through hole. Accordingly, with the lid according to the present invention, it is possible to prevent the liquid inside the container from leaking or spraying out from the through hole of the top part, for example, when carrying a container that has its contents stored inside, or when delivering contents stored in a container by vehicle, etc. In addition, the lid according to the present invention has a top cover portion formed of a paper material that is less likely to impose a load on the environment. Therefore, according to the lid of the present invention, it is possible to easily prevent liquid leakage with a simple structure while using a paper material that is not easily formed into a complex shape or structure for preventing liquid leakage like a plastic lid. Further, according to the present invention, since the top cover portion and the side wall portion are formed of a paper material, it is also possible to reduce the load on the environment compared to a lid mainly made of a plastic material.

Brief Description of the Drawings

[0011] [Figure 1] It is an external perspective view showing an embodiment of the lid according to the present invention from the front side. [Figure 2] It is an external perspective view showing the appearance of the lid from the back side. [Figure 3] FIG. 3(a) is an external perspective view showing the internal member from the front side, and FIG. 3(b) is an external perspective view showing the internal member from the back side. [Figure 4] It is a cross-sectional view taken along line A-A of FIG. 3(a). [Figure 5] It is a plan view of the lid in a state where the drinking mouth portion is closed. [Figure 6] It is a plan view of the lid in a state where the drinking mouth portion is open. [Figure 7] It is a bottom view of the lid. [Figure 8] It is a cross-sectional view taken along line B-B in FIG. 7. [Figure 9] It is an explanatory view for explaining the operation and effect of the lid according to the present embodiment. [Figure 10] ]>It is an explanatory view for explaining a state where a plurality of lids are stacked. [Figure 11] It is a modified example of the internal member. FIG. 11(a) is an external perspective view showing the internal member forming the drinking mouth insertion portion and the drinking mouth liquid avoiding wall from the back side, and FIG. 11(b) is an external perspective view showing the internal member forming the insertion portion and the liquid avoiding wall from the back side. [Figure 12] It is an external perspective view showing a modified example of the internal member from the back side. [Figure 13] It is an external perspective view showing a modified example of an internal member. [Figure 14] It is an external perspective view showing a modified example of an internal member. [Figure 15] It is an explanatory diagram for explaining a modified example of a liquid-repellent wall in the internal member shown in FIG. 14. [Figure 16] It is an explanatory diagram for explaining a modified example of a liquid-repellent wall in the internal member shown in FIG. 14. [Figure 17] It is an external perspective view showing a modified example of an internal member. [Figure 18] It is an explanatory diagram for explaining different modes of the lid body. [Figure 19] It is an explanatory diagram for explaining different modes of the lid body. [Figure 20] It is an explanatory diagram for explaining different modes of the lid body. [Figure 21] It is an explanatory diagram for explaining different modes of the lid body. [Figure 22] It is an explanatory diagram for explaining different modes of the lid body. [Figure 23] It is a perspective view showing different modes of the lid body. [Figure 24] It is a perspective view showing different modes of the lid body. [Figure 25] It is a cross-sectional view taken along the line C-C of FIG. 23. [Figure 26] It is an explanatory diagram showing the state where the lid body closes the container. [Figure 27] It is a perspective view showing different modes of the lid body.

Mode for Carrying Out the Invention

[0012] Embodiments relating to the lid of the present invention will be described in detail with reference to the drawings. As shown in Figures 1 to 9, the lid 1 according to the present invention comprises a top portion 2 made of a paper-based material, a side wall portion 3 made of a paper-based material that surrounds the top portion 2, and an internal member 4 provided on the lower surface side of the top portion 2, and is formed to allow opening and closing of the mouth portion 102 of a container 101 that is formed to contain a liquid substance as the contents 104. The lid 1 is characterized in that a discharge hole 5 and a drinking spout portion 6 as an outflow hole are formed through the top portion 2 as through holes that penetrate from the inside to the outside, and the internal member 4 comprises an insertion portion 7 that communicates with the side of the top portion 2 and the inner surface side of the container 101, and a liquid-receiving wall 8 formed around the insertion portion 7.

[0013] The lid 1 is for opening and closing the mouth 102 formed in the container 101, and is formed separately from the container 101. As shown in Figure 1, the lid 1 comprises a top cover portion 2, a side wall portion 3, and an internal member 4.

[0014] The canopy portion 2 comprises a top surface portion 9 and a hanging piece 10. The canopy portion 2 is formed by bending the periphery of a canopy portion forming member, which is formed as a blank material, downward. This bent periphery portion becomes the hanging piece 10, and the inner portion surrounded by the hanging piece 10 becomes the top surface portion 9. The top surface portion 9 is formed in a circular shape in plan view and is designed to completely cover the mouth portion 102 of the container 101 from above when the lid is closed. Discharge holes 5 are formed through the top surface portion 9 so as to penetrate the inside and outside of the canopy portion 2, in other words, so as to penetrate the surface 9a side and the back surface 9b side of the top surface portion 9.

[0015] The discharge hole 5 is formed in the central part of the top surface 9 and, as described above, is formed to penetrate between the surface 9a and the back surface 9b of the top surface 9. This discharge hole 5 is intended to prevent an increase in pressure (internal pressure) inside the container 103 when the contents 104 of the container 101 are a hot liquid (for example, hot coffee, liquid used in various side dishes such as ramen), or when the contents 104 are a liquid mineral such as a carbonated beverage, when the lid 1 is attached to the container 101 and the lid is closed.

[0016] The size and shape of the discharge hole 5 are not limited to those shown in Figure 1, etc., and can be set arbitrarily. For example, the discharge hole 5 may be round, polygonal, or a conventionally known shape such as a star. Also, the number of discharge holes 5 is not limited to one, but may be formed through multiple holes. Furthermore, the position where the discharge hole 5 is formed through is not limited to the central part of the top surface 9, but may be formed at a position other than the central part of the top surface 9. It is preferable to position the discharge hole 5 inside the insertion part 7 of the internal member 4, which will be described later, in order to prevent liquid leakage or ejection from the discharge hole 5. The discharge hole 5 may also be formed by a linear cut line, as long as it has the function of releasing the gas inside the container 101 to the outside.

[0017] The drinking spout portion 6 is formed closer to the edge of the top surface portion 9 than to the center of the top surface portion 9. When not in use, this drinking spout portion 6 is closed by the drinking spout forming portion 11, and is opened when in use by pulling up the drinking spout forming portion 11. When not in use, the drinking spout forming portion 11 is secured to the top surface portion 9 at multiple points by point fastening (including perforations) or half-cuts, and when the drinking spout portion 6 is moved from the closed position to the open position to open the drinking spout portion 6, the point fastening points or half-cuts are broken, and the drinking spout portion 6 is opened. As shown in Figure 1, one end of the label 12 is attached to the drinking spout forming portion 11 by any method such as ultrasonic bonding, heat sealing, high-frequency bonding, bonding with various adhesives, etc., and the drinking spout portion 6 can be opened by pinching and pulling up the other end of the label 12 to pull up the drinking spout forming portion 11. The term "point fixing" refers to the practice of forming the drinking spout portion 11 on the canopy portion forming member using a blade-shaped member. This involves leaving some areas uncut in addition to the areas where cuts are made in the canopy portion forming member, so that the drinking spout portion 11 is partially joined to the top surface portion 9 only by these uncut areas. The number and location of these point fixings can be determined arbitrarily.

[0018] The hanging piece 10 is formed on the peripheral edge of the top surface 9 and is formed to hang down and surround the periphery. The hanging piece 10 is formed so that its outer peripheral surface 10a is joined and integrated with the side wall portion 3, and its inner peripheral surface 10b is formed by folding back the lower end portion of the side wall portion 3 to create a folded portion 13.

[0019] The side wall portion 3 is formed surrounding the top surface portion 9 of the canopy portion 2. This side wall portion 3 is formed in an annular shape by joining the ends of, for example, an annular fan-shaped blank material (not shown) together. Furthermore, when this side wall portion 3 is formed in an annular shape in this way, it is formed in a tapering inclination from the upper end to the lower end. The side wall portion 3 comprises an upper wall 14, a lower wall 15, and a folded portion 13. These upper wall 14, lower wall 15, and folded portion 13 are formed to be continuous. The upper wall 14 refers to the portion of the side wall portion 3 that is above the surface 9a of the top surface portion 9 when it is joined and integrated with the canopy portion 2, and the lower wall 15 refers to the portion of the side wall portion 3 that is below the back surface 9b of the top surface portion 9 when it is joined and integrated with the canopy portion 2. When referring to the upper wall 14 and the lower wall 15, the portion corresponding to the thick part of the top surface 9, that is, the portion of the side wall 3 between the surface 9a and the back surface 9b of the top surface 9, will be described as being included in both the upper wall 14 and the lower wall 15.

[0020] The upper wall 14 is formed to be located above the surface 9a of the top surface 9, and the inner diameter at the upper end is larger than the inner diameter at the point where it contacts the surface 9a of the top surface 9. This configuration greatly improves stackability when multiple lids 1 are stacked and transported (see Figure 10). The upper wall 14 also has an overhang 16 at its upper end. This overhang 16 is formed to be larger in the radial direction (the length direction from the center to the end of the lid 1 when viewed from above) than the side wall 3, compared to other parts of the side wall 3. This overhang 16 may be formed by bending into a curl shape, or it may be an overhang formed in a flange shape. This overhang 16 is not essential for the lid 1, but it is preferable to form it as it improves the overall strength of the lid 1. The shape and curl size of this overhang 16 may be arbitrarily selected from conventionally known sizes and shapes, and is not limited to the shape described herein. Alternatively, instead of the protruding portion 16, or in combination with the protruding portion 16, the upper end portion of the upper wall 14 may be folded inward to form a reinforcing portion. Similarly, the upper end portion of the upper wall 14 may be folded outward instead of inward to form a reinforcing portion.

[0021] The lower wall 15 is formed to be located below the back surface 9b of the top surface 9, and the inner diameter at the lower end is smaller than the inner diameter at the position where it contacts the back surface 9b of the top surface 9. Furthermore, it is preferable that the inner diameter at the lower end of this side wall 3 is smaller than the outer diameter around the mouth 102 of the container 101, and it is preferable that the inner diameter at the position where the lower wall 15 of the side wall 3 contacts the back surface 9b of the top surface 9 is approximately the same as the outer diameter around the mouth 102 of the container 101. Here, "approximately the same" means a diameter that allows the lid 1 to fit snugly around the mouth 102 of the container 101 when the mouth 102 of the container 101 is closed with the lid 1.

[0022] The folded portion 13 is formed by folding a part of the lower wall 15 of the side wall 3 inward. The folded portion 13 has a protruding engaging portion 17 on its inner side, which engages with the container-side curl portion 106 formed around the mouth portion 102 of the container 101 when attached to the container 101, and is configured to lock with the container-side curl portion 106 when the lid is closed. From the viewpoint of ensuring airtightness of the lid as a whole, it is preferable that the inner diameter of the lowest end of the folded portion 13 is smaller than that of the container-side curl portion 106. It is preferable that the folded portion 13, the hanging piece 10, and the lower wall 15 are joined and integrated by any conventionally known method such as ultrasonic bonding, heat sealing, or bonding with various adhesives.

[0023] As shown in Figure 2, the internal member 4 is formed on the lower side of the lid portion 2, that is, on the back surface 9b side of the top portion 9. In the lid 1 according to this embodiment, the internal member 4 is joined and integrated with the back surface 9b of the top portion 9. The joining of the internal member 4 may be performed by any conventionally known method such as ultrasonic bonding, heat sealing, high-frequency welding, or bonding with various adhesives, but from the viewpoint of ease of joining, it is preferable to perform the joining by ultrasonic bonding.

[0024] The internal member 4 is a member provided so as to be located on the container 101 side of the lid 1, in other words, on the inside, when the lid 1 is closed on the container 101. This internal member 4 is formed from a plate-like member formed by combining three straight inner sides and one arc-shaped side of the container 101. The internal member 4 includes an insertion part 7, a liquid-receiving wall 8, a drinking spout insertion part 20, liquid-receiving walls 21a and 21b for the drinking spout, and a joint part 30. The one arc-shaped side of the plate-like member that becomes the internal member 4 is formed to draw an arc that does not interfere with the arc formed on the inner surface of the side wall part 3 when joined to the back surface 9b of the top surface part 9. Note that the shape of this internal member 4 is not limited to the above and may be other shapes. Also, as shown in Figure 2, when the internal member 4 is attached to the back surface 9b of the top surface part 9, it is preferable that the position where the insertion part 7 is formed coincides with the position of the discharge hole 5. Furthermore, this internal member 4 can be formed from paper-based material, resin-based material, etc. When forming the internal component 4 from a paper-based material, any conventionally known method may be arbitrarily selected, such as forming it by die-cutting from a roll of paper. When forming the internal component 4 from a resin-based material, it may be integrally molded by injection molding, blow molding, extrusion molding, etc., or any other conventionally known method may be arbitrarily selected.

[0025] The insertion portion 7 is formed in the shape of a hole that allows communication between the lid portion 2 and the inside 103 of the container 101 when the internal member 4 is attached to the back surface 9b of the top portion 9. This insertion portion 7 is provided at a position that overlaps with the position where the discharge hole 5 is formed in the top portion 9 (lid portion 2). Furthermore, it is preferable that the insertion portion 7 is formed to be the same size as the discharge hole 5, or to be an opening larger than the discharge hole 5.

[0026] The liquid-receiving wall 8 is formed around the insertion portion 7. As shown in Figure 2, etc., in the lid 1 according to this embodiment, the liquid-receiving wall 8 is formed by bending a predetermined portion of the plate-shaped member constituting the inner member 4, so that it protrudes from the surface of the inner member 4 toward the inner surface of the container 101. Note that the method of forming the liquid-receiving wall 8 is not limited to bending, and it may also be formed by providing a separate member for the liquid-receiving wall 8, for example. The liquid-receiving wall 8 is composed of wall portions 18a to 18d formed around the insertion portion 7. These wall portions 18a to 18d have restricting portions 19a to 19d, one end in the longitudinal direction of which is bent toward the insertion portion 7. These restricting portions 19a to 19d are for preventing the wall portions 18a to 18d from collapsing toward the insertion portion 7 and for enabling the wall portions 18a to 18d to maintain an upright state at a predetermined angle. In other words, as shown in Figures 3 and 4, etc., in the inner member 4, wall portions 18a to 18d are formed around the insertion portion 7, and restricting portions 19a to 19d are formed to protrude toward the insertion portion 7 (opening). Therefore, when the inner member 4 is viewed from above, these restricting portions 19a to 19d are bent so as to protrude inward from the edge of the insertion portion 7. When the inner member 4 is joined to the back surface 9b of the top surface 9, the back surface 9b is located behind the insertion portion 7. Therefore, if some force acts on the wall portions 18a to 18d and attempts to tilt toward the direction in which the insertion portion 7 is formed as an opening, the restricting portions 19a to 19d will come into contact with the back surface 9b of the top surface 9, preventing the wall portions 18a to 18d from tilting any further. Therefore, the wall portions 18a to 18d can maintain an upright position while maintaining a predetermined angle because the regulating portions 19a to 19d are formed therein. The angle at which the wall portions 18a to 18d stand can be arbitrarily determined to be such that the contents of the container 101 reach the discharge hole 5 and the contents are prevented from leaking or spraying out of the discharge hole 5. However, from the viewpoint of ease of processing, it is preferable that the wall portions 18a to 18d are at an angle that is slightly tilted toward the insertion portion 7.Furthermore, it is preferable that the lower ends of these wall portions 18a to 18d are positioned at the same height as the lower end of the side wall portion 3, or higher than the lower end of the side wall portion 3. By forming the wall portions 18a to 18d to this size, when stacking multiple lids 1, the height of the wall portions 18a to 18d does not affect the stacking performance, and good stacking properties can be maintained.

[0027] The drinking spout insertion portion 20 is formed as a hole that connects the lid portion 2 side to the inside 103 side of the container 101 when the internal member 4 is attached to the back surface 9b of the top portion 9. This drinking spout insertion portion 20 is provided at a position that overlaps with the position where the drinking spout portion 6 is formed on the top portion 9. Furthermore, it is preferable that the drinking spout insertion portion 20 is formed to be the same size as the drinking spout portion 6, or, as shown in Figure 6, to be a smaller opening than the drinking spout portion 6. By forming it to such a size, it is possible to prevent the contents 104 from leaking out of the drinking spout portion 6 when the lid 1 is attached to the container 101 and used.

[0028] The liquid-receiving walls 21a and 21b for the drinking spout are formed around the drinking spout insertion portion 20. In this embodiment, these liquid-receiving walls 21a and 21b are formed at positions opposite each other, with the drinking spout insertion portion 20 in between. These liquid-receiving walls 21a and 21b have restricting pieces 22a and 22b formed at one end in the longitudinal direction of the liquid-receiving walls 21a and 21b, which are bent toward the drinking spout insertion portion 20. These restricting pieces 22a and 22b prevent the liquid-receiving walls 21a and 21b from falling toward the drinking spout insertion portion 20 and maintain the liquid-receiving walls 21a and 21b in an upright position at a predetermined angle. Furthermore, by forming these liquid-receiving walls 21a and 21b, openings 25 and 26 are formed around the drinking spout insertion portion 20. In this embodiment, in addition to the wall portions 18a to 18d that constitute the liquid-receiving wall 8 described above, drinking spout liquid-receiving walls 21a and 21b are formed, and restricting pieces 22a and 22b are also formed on these drinking spout liquid-receiving walls 21a and 21b. Therefore, because these restricting pieces 22a and 22b are formed, for the same reasons as described above for the wall portions 18a to 18d, the drinking spout liquid-receiving walls 21a and 21b can also maintain an upright position while maintaining a predetermined angle. Furthermore, for the drinking spout liquid-receiving walls 21a and 21b, for the same reasons as described above for the wall portions 18a to 18d, it is preferable that the drinking spout liquid-receiving walls 21a and 21b are at an angle that is slightly tilted toward the drinking spout insertion portion 20, and it is preferable that the lower end position of the drinking spout side liquid-receiving walls 22a and 22b is at the same position as the lower end position of the side wall portion 3, or above the lower end position of the side wall portion 3. Furthermore, the lower ends of the liquid-receiving walls 22a and 22b on the drinking spout side and the lower ends of the wall sections 18a to 18d may be the same or different. Also, the lower ends of the liquid-receiving walls 22a and 22b on the drinking spout side may be the same or different. In addition, the lower ends of the wall sections 18a to 18d may be the same or different.

[0029] Examples of paper-based materials for forming the lid 1 according to the present invention include so-called paper materials obtained by forming a sheet from a slurry of fiber raw materials on a mesh, drying or press-drying it, and then papermaking it; so-called airlaid sheets obtained by crushing pulp obtained by crushing a raw material sheet made of pulp fibers in a crusher, stacking the opened fiber raw materials with an airflow, and fixing the fibers of the stacked material with a binder; and laminates of multiple such sheets. So-called transparent paper made of cellulose nanofibers (cellulose microfibrils) can also be used. Paper-based materials may consist only of pulp, or may contain non-pulp fibers, synthetic fibers, regenerated fibers, etc., but natural fibers other than pulp or naturally biodegradable fibers are preferred. It is also preferable that the material contains 50% by mass or more of pulp, more preferably 70% by mass or more, and even more preferably 80% by mass or more, but it is especially preferable that it consists of 100% by mass of pulp. Paper-based materials can include composite materials with synthetic resins, natural resin films and nonwoven fabrics, wood-based materials such as wood foil, and even aluminum foil. However, when using composite materials, it is preferable that the composite material as a whole contains 50% by mass or more of pulp, natural fibers, and naturally biodegradable resin components, and is particularly preferable to contain 80% by mass or more of pulp. A higher content of naturally biodegradable components such as pulp is preferable because it makes the paper-based material more easily biodegradable. In particular, it is preferable that the proportion of pulp is 95% by mass or more.

[0030] Pulps can be obtained from wood pulp, non-wood pulp, recycled paper pulp, etc. The pulp can include coniferous pulp such as Japanese red pine, fir, Yezo spruce, Douglas fir, hemlock, and spruce; hardwood pulp such as beech, oak, birch, eucalyptus, poplar, and alder; wood pulp such as mixtures of coniferous and hardwood pulp; non-wood pulp such as kenaf, bagasse pulp, bamboo pulp, cereal pulp, straw pulp, abaca pulp, and cotton pulp; and recycled paper pulp. Because softwood pulp has longer fibers than hardwood pulp, paper materials made using pulp with long fibers such as softwood pulp have a greater degree of fiber entanglement. Furthermore, crushed pulp obtained by crushing raw material sheets made from softwood pulp also has longer fibers than crushed pulp obtained by crushing raw material sheets made from hardwood pulp, resulting in improved strength of paper-based materials due to the increased fiber entanglement.

[0031] The paper-based material is preferably water-resistant. This may involve using a material that is already water-resistant, such as water-resistant paper, or a material in which a coating layer is provided on at least the surface of the paper-based material that is located on the container side. The coating layer can be provided by attaching a film or by applying a coating agent, but it is preferable to provide it by applying a coating agent. The coating layer can be formed from polyvinyl chloride, polyvinylidene chloride, polyurethane, polyethylene terephthalate, olefin resins such as polyethylene and polypropylene, polyvinyl alcohol, acrylic resins such as polyacrylic acid, polymethacrylic acid, acrylonitrile-butadiene-styrene copolymer, polyethylene terephthalate, cellophane, nylon, ethylene-vinyl alcohol copolymer, polymethylpentene, polyvinyl acetate, polylactic acid, polycaprolactone, polyhydroxyalkanoate, starch resin, etc. Two or more types may be used in combination, but acrylic resins, olefin resins, urethane resins, biodegradable resins, etc. are particularly preferred. In particular, forming the coating layer with resins such as cellulose derivatives, polylactic acid, polycaprolactone, polyvinyl alcohol, polybutylene succinate resins, modified polyethylene terephthalate, polyglycolic acid, starch resins, biodegradable urethane resins, and biodegradable resins is preferable because it improves natural decomposition. As the paper-based material used for each part of the lid 1 according to the present invention, a material with a basis weight of approximately 150 g / m2 to 400 g / m2 can be used, but a material with a basis weight of 160 g / m2 to 360 g / m2 is more preferable, and a material with a basis weight of 170 g / m2 to 350 g / m2 is even more preferable.

[0032] Furthermore, when forming the internal member 4 with a resin material, the resin-based material used may be any of the above-mentioned examples of coating agents.

[0033] Next, the effects of the lid 1 according to the present invention will be explained. As shown in Figure 9, the lid 1 closes the mouth 102 of the container 101 when in use. In this case, a discharge hole 5 is located approximately in the center of the lid 1, and a liquid-receiving wall 8 consisting of wall portions 18a to 18d is formed around this discharge hole 5. In addition, a drinking spout 6 is located closer to the edge than the center of the lid 1, and liquid-receiving walls 21a and 21b for the drinking spout are formed around this drinking spout 6, and the wall portion 18a of the liquid-receiving wall 8 is located there.

[0034] In such a situation, for example, when a user is carrying a container 101 with the lid 1 attached by hand, or when it is being transported in a car or the like by a delivery service, the container 101 with the lid 1 attached will vibrate, causing liquid contents 104 of the container 101 to shake. At this time, the liquid contents 104 shake in all directions within the container 101, and the liquid level may rise due to collisions with the inner surface of the container 101, or the waves generated by the liquid shaking may collide with each other, resulting in larger waves or splashes. However, with the lid 1 according to the present invention, even if the liquid level of the contents 104 rises or waves are generated due to liquid shaking, the generated waves will collide with the wall portions 18a to 18d of the liquid protection wall 8, thus preventing the wave height from rising further. Therefore, even if liquid turbulence occurs within the container 101, it is possible to prevent the height of the waves generated by the turbulence from reaching the discharge hole 5 on the top surface 9, thereby preventing the liquid contents 104 from leaking out or being ejected from the discharge hole 5. Moreover, since the lid 1 according to the present invention has walls 18a to 18d formed around the discharge hole 5, at least one of the walls 18a to 18d can reliably prevent the wave height from rising against waves coming from any direction. Therefore, it is possible to reliably prevent leakage or ejection from the discharge hole 5 due to liquid turbulence of the contents 104.

[0035] Furthermore, the lid 1 according to the present invention can reduce the risk of increased internal pressure in the container 101 when the lid is closed, such as when the contents 104 are hot or carbonated beverages, by forming a discharge hole 5 through the lid. In addition, especially with hot beverages, water droplets may easily adhere to the walls 18a to 18d due to steam inside the container 101. If the container 101 is shaken while such water droplets are present, the attached water droplets may leak out or spray out from the discharge hole 5. However, with the lid 1 according to the present invention, the position of the discharge hole 5 and the position of the tip of the wall 18a to 18d are offset so as not to overlap, thus preventing the leakage or spraying of water droplets as described above.

[0036] Furthermore, the lid 1 according to the present invention also has liquid-receiving walls 21a and 21b for the drinking spout formed around the drinking spout insertion portion 20, so the same effect as described above is produced by these liquid-receiving walls 21a and 21b. In the case of the drinking spout insertion portion 20, in addition to the liquid-receiving walls 21a and 21b, the wall portion 18a also functions as a liquid-receiving wall for the drinking spout. That is, because the drinking spout insertion portion 20 has liquid-receiving walls 21a and 21b formed thereon, the contents 104 can reach the drinking spout portion 6 due to the liquid movement in the direction in which these liquid-receiving walls 21a and 21b are formed, and leakage from the drinking spout portion 6 can be prevented by the effect described above. Furthermore, in addition to the above, in the direction perpendicular to the direction in which the liquid-receiving walls 21a and 21b for the drinking spout are formed, the wall portion 18a of the liquid-receiving wall 8 functions as a liquid-receiving wall on the drinking spout side. Therefore, in the direction in which the drinking spout insertion portion 20 and the wall portion 18a are positioned, the liquid level rises due to the liquid-receiving wall 21a on the hole side, and it is possible to prevent the contents 104 from reaching the drinking spout portion 6 and leaking out from the drinking spout portion 6.

[0037] Thus, with the lid 1 according to the present invention, even when the container 101 is susceptible to vibration, such as when a user is holding it in their hand or during transport by a delivery service, and liquid sloshing occurs in all directions around the contents 104, it is possible to prevent leakage or splashing of the contents 104 from the discharge hole 5 or drinking spout 6 caused by such liquid sloshing.

[0038] Furthermore, the lid 1 according to the present invention can reduce the amount of contents 104 that accumulate on the underside 9b of the top surface 9 when the lid 1 is removed. Therefore, it is possible to prevent the contents 104 from spilling and wetting and soiling the area around the container 101 or the user's clothes when the lid 1 is removed.

[0039] The lid 1 according to the present invention has a top portion 2 and side wall portions 3 made of a paper-based material that is less likely to cause environmental damage. Therefore, the lid 1 according to the present invention makes it possible to easily prevent leakage of the contents 104 with a simple structure, even though it is not easy to form a complex shape or structure to prevent leakage of the contents 104 by molding, unlike a plastic lid. Furthermore, because the top portion 2 and side wall portions 3 of the lid 1 according to the present invention are made of a paper-based material, it is possible to significantly reduce the environmental burden compared to a lid mainly made of plastic material.

[0040] Figure 10 shows a state in which multiple lids 1 are stacked. As shown above, with the lid 1 according to the present invention, the lower ends of the liquid relief walls 21a to 21d on the hole side and the liquid relief walls 21a and 21b for the drinking spout are positioned at least at the same position as the lower end of the side wall 3, and preferably above the lower end of the side wall 3, so that stackability can be maintained when multiple lids 1 are stacked.

[0041] Next, a first modified example of the lid 1 according to the present invention will be described. In the description of the modified example shown below, the description of parts with the same configuration as those described earlier will be omitted, and the same reference numerals will be used. In this specification, each of the components may be used in combination as appropriate, or each may be used separately and independently.

[0042] Figure 11 shows a modified example of the internal member 4. The internal member 4 may be formed by creating only the drinking spout insertion portion 20 and the drinking spout liquid avoidance walls 21a and 21b, as shown in Figure 11(a), or by creating only the insertion portion 7 and the liquid avoidance wall 8, as shown in Figure 11(b). In this way, by forming the internal member 4 corresponding to the drinking spout portion 6 and the internal member 4 corresponding to the discharge hole 5 separately, it is possible to clearly separate the locations where the internal member 4 is provided and where it is not necessary, for example, by providing the internal member 4 only at the drinking spout portion 6, or conversely, only at the discharge hole 5. In other words, since the internal member 4 can be provided at the necessary locations, the amount of raw materials used can be reduced, and raw material costs and manufacturing costs can be reduced. Note that, as shown in Figure 11, the internal member 4 corresponding to the discharge hole 5 and the internal member 4 corresponding to the drinking spout portion 6 are separate, but it is not necessarily required that they be provided separately, and both internal members 4 may be used in combination.

[0043] Figure 12 shows another modified example of the inner member 4. In this inner member 4, two opposing sides 4a and 4b are formed in a straight line, while two opposing sides 4c and 4d are formed in an arc. Furthermore, the end opposite to the end where the drinking spout insertion portion 20 is formed is formed so that the amount extending from the location where the liquid-receiving wall 8 is formed is greater than that of the inner member 4 described above. By forming the inner member 4 in this way, the joining area of ​​the joint portion 30 can be increased, and the back side 9b of the top surface portion 9 can be configured to be held by being sandwiched between the inner surfaces of the side walls 3. Therefore, when joining, a stronger bond can be achieved, and when holding by being sandwiched between the inner surfaces of the side walls 3, adhesives and other materials required for joining become unnecessary, and when joining by ultrasonic bonding, the joining process becomes unnecessary, thus reducing manufacturing costs.

[0044] Figure 12(b) shows another modified example of the inner member 4. In this inner member 4, the plate-shaped member is formed in a circular shape. By forming it in this circular shape, in addition to the modified example described in Figure 12(a), it is possible to increase the bonding area and to hold the inner member 4 more firmly when it is held by being sandwiched between the inner surfaces of the side walls 3.

[0045] Figure 13 shows another modified example of the internal member 4. In this internal member 4, an insertion portion 7 and a drinking spout insertion portion 20 are formed, but a liquid-receiving wall 8 is formed only in the insertion portion 7, and the drinking spout liquid-receiving walls 21a and 21b are not formed in the area where the drinking spout insertion portion 20 is formed. Thus, liquid-receiving walls 8, etc., may be formed as needed. It should be noted that the example is not limited to the above example, and for example, a modified example of the internal member 4 may be one in which an insertion portion 7 and a drinking spout insertion portion 20 are formed, but drinking spout liquid-receiving walls 21a and 21b are formed and liquid-receiving wall 8 is not formed.

[0046] Figures 14 and 15 show another modified example of the internal member 4. This internal member 4 differs from the other embodiments in the configuration of the liquid-receiving wall 8. Specifically, in this modified example, the internal member 4 has a liquid-receiving wall 8 formed so as to surround the insertion portion 7. By surrounding the insertion portion 7 with the liquid-receiving wall 8 in this way, liquid leakage from the discharge hole 5 can be sufficiently prevented. When configuring the liquid-receiving wall 8 in this way, for example, the liquid-receiving wall 8 may be formed by bending or other processes applied to the plate-shaped member forming the internal member 4, or the member that will become the liquid-receiving wall 8 may be formed separately from the plate-shaped member, and the member that will become the liquid-receiving wall 8 may be joined to the plate-shaped member to form the internal member 4. In addition, the internal member 4 may be formed by methods other than those listed above.

[0047] The shape of the liquid-receiving wall 8 is not limited to polygonal shapes such as the quadrilateral shape shown in Figures 14 and 15(a). For example, it may be a circular shape as shown in Figure 15(b), a star shape as shown in Figure 15(c), a triangular shape as shown in Figure 15(d), or a star shape as shown in Figure 15(e) inverted from the configuration in Figure 15(c). In addition, any other shape that is conventionally known may be arbitrarily selected and used as appropriate.

[0048] Furthermore, as shown in Figure 16, the shape of the lower end portion of the liquid receptacle wall 8 is not limited to being straight. For example, the lower end portion of the liquid receptacle wall 8 may be wavy, as shown in Figure 16(a), triangular, as shown in Figure 16(b), or jagged, as shown in Figure 16(c). It may also be triangular, as shown in Figure 16(d). In addition, any other conventionally known shape may be adopted and used for the lower end portion of the liquid receptacle wall 8, as long as it can eliminate liquid leakage from the discharge hole 5 as described above.

[0049] Figure 17 shows another modified example of the internal member 4. In this internal member 4, the shape of the liquid-receiving wall 8 is further different, with restricting portions 19a to 19d formed on one end of the wall portions 18a to 18d, as well as restricting portions 27a to 27d formed on the other end of the wall portions 18a to 18d. By forming restricting portions 19a to 19d and restricting portions 27a to 27d on both ends of the wall portions 18a to 18d in this way, it is possible to maintain a more firmly upright posture of the wall portions 18a to 18d.

[0050] Figures 18 to 22 show another modified example of the lid 1 according to the present invention. Specifically, the lid 1 shown in Figures 18(a) to 18(e), Figures 19(a) to 19(d), Figures 20(a) to 20(e), and Figures 21(a) to 21(f) is a configuration in which a raised portion 28 is formed on the peripheral edge of the top surface portion 9 of the canopy portion 2, and the lid 1 is formed by joining and integrating the outer surface of this raised portion 28 with the side wall portion 3. Even with such a lid 1, the internal member 4 according to the present invention can be applied, thereby preventing leakage or ejection of the contents 104 from the discharge hole 5. Similarly, even with the lid 1 in the configuration shown in Figures 22(a) to 22(e), the internal member 4 according to the present invention can be applied, thereby preventing leakage or ejection of the contents 104 from the discharge hole 5.

[0051] In the example described above, a lid applicable to a cup with a circular shape in plan view is used as an example of lid 1. However, lid 1 is not limited to having a circular shape when viewed from above. It can be arbitrarily selected and used from conventionally known shapes such as elliptical, triangular, or quadrilateral shapes, or star shapes.

[0052] The lid 1 according to the present invention can be applied to, for example, the lids of beverage cups such as coffee and juice cups, the lids of containers formed to hold various kinds of prepared foods, and the lids of containers that can hold various kinds of food and beverages containing liquids, such as ramen, soba, and udon noodles. Furthermore, the lid 1 is not limited to food and beverages as long as the contents are liquid, and can be applied to any field of lids related to packaging containers.

[0053] Furthermore, while the above-described lid is exemplified as being formed in a tapered shape that narrows from top to bottom, it is acceptable as long as the inner member 4 can be provided on the top lid portion 2, or more specifically, the top surface portion 9, and the shape of the side wall portion 3 is not limited to the tapered shape described above. For example, it may be straight from top to bottom, or it may be a lid formed in a tapered shape that widens from top to bottom. Also, the object to which the inner member is attached is not limited to the top lid portion 2, as it may be formed on the lower surface side of the top lid portion 2.

[0054] Next, another modification of the lid according to the present invention will be described based on Figures 23 to 26. In this embodiment, the lid 1 is used by being joined along the edge 105 formed on the mouth 102 of the container 101. The lid 1 is formed in a shape that covers the mouth 102 when joined to the mouth 102 of the container 101. As shown in Figures 25, 26, etc., the lid 1 has a joining region R on its back side that is joined to the edge 105 of the mouth 102 of the container 101. In addition, in a plan view of the lid 1, the drinking spout 6 and discharge hole 5 are formed in the inner region Rn, which is the region of the exposed surface 201 of the lid 1 that corresponds to the inside of the joining region R. The configuration of the through hole including the drinking spout 6 and discharge hole 5, and other configurations of the lid 1 are the same as those described earlier, so they will be omitted here.

[0055] The joining region R is a region formed along the mouth 102 of the container 101, with a shape corresponding to the mouth 102. The width of the joining region R (width along the inward and outward direction) is usually the same as or narrower than the width of the edge 105 of the mouth 102. However, this does not prohibit the joining region R from being wider than the edge 105. The joining region R may be formed inside the outer peripheral edge 202 of the lid 1, or it may be formed up to the outer peripheral edge 202 of the lid 1. Unless otherwise specified, the position relative to the joining region R is defined as the position relative to the part of the lid 1 that forms the joining region R. For example, when referring to the inside (outside) of the joining region R, unless otherwise specified, it means the inside (outside) of the part of the lid 1 that forms the joining region R.

[0056] As shown in Figure 24, etc., the lid 1 has an internal member 4 on the back surface 9b side of the top surface 9 of the top lid 2. In this embodiment of the lid 1, the internal member 4 is provided on the back surface 9b side of the top surface 9 by a method such as adhesive, as described earlier. When providing the internal member 4 in this embodiment of the lid 1, it is preferable to provide the internal member 4 in the inner region Rn, which is inside the joining region R. By providing the internal member 4 in the inner region Rn, no step is created in the joining region R, so when the lid 1 is joined to the edge 105 of the container 101 by a method such as heat sealing, it becomes possible to join and close the lid in a stable state. The detailed configuration of the internal member 4 is the same as described earlier. Alternatively, as shown in Figure 27, the internal member 4 may be formed separately as a member 4a corresponding to the drinking spout 6 and a member 4b corresponding to the discharge hole 5, and provided on the back surface 9b side of the top surface 9.

[0057] Although the lid 1 according to the present invention has been described in detail above, the lid 1 according to the present invention is not limited to the examples described above, and may be modified as appropriate without departing from the spirit of the present invention. For example, although the drinking spout 6 and discharge hole 5 are given as examples of through holes in this specification, the through holes are not limited to these. For example, they may be notched holes formed so that a straw-like object (such as a straw) can be inserted, or they may be through holes of other shapes. In other words, the size and shape of the through holes in this specification are not particularly limited as long as they are formed to penetrate through the inside and outside of the lid 2. Furthermore, the internal members may be provided separately and independently corresponding to each through hole, or liquid-receiving walls etc. corresponding to multiple through holes may be formed within a single internal member, and their form is not particularly limited.

[0058] This invention encompasses the following technical concepts. (1) A lid for closing the opening of a container for storing liquids, comprising a top portion made of a paper-based material having through holes that penetrate from the inside to the outside, and an inner member provided on the lower side of the top portion, wherein the inner member comprises an insertion portion that communicates with the top portion and the inner surface of the container, and a liquid-receiving wall formed around the insertion portion, (2) The liquid-receiving wall is formed to protrude from the surface of the inner member toward the inner surface of the container as described in (1) above. (3) The insertion portion is provided in a position that overlaps with the position of the through hole formed in the top cover portion, the cover body described in (1) or (2) above. (4) A lid according to any one of (1) to (3) above, wherein at least a portion of the lid has a gap between the top part and the inner member. (5) The lid according to any one of (1) to (4) above, wherein the side wall portion is formed from a blank material made of paper. (6) The liquid-receiving wall is a lid according to any one of (1) to (5) above, having a restricting portion that restricts the liquid-receiving wall from collapsing. (7) A lid according to any one of (1) to (6) above, wherein a plurality of through holes are formed and the liquid-receiving wall is formed for each of the plurality of through holes, (8) The lid according to any one of (1) to (7) above, wherein the top part has an opening for drinking, the inner member has a drinking spout insertion part formed at a position overlapping with the drinking spout, and a drinking spout liquid-relieving wall is formed around the drinking spout insertion part. (9) The lid according to any one of (1) to (8) above, wherein the lower end position of the liquid-receiving wall is at the same position as the lower end position of the side wall portion or is located above the lower end position of the side wall portion. (10) The lid according to any one of (1) to (9) above, the through hole includes one of the following: an insertion hole formed to allow a straw-like object to be inserted, an outlet hole for releasing gas from inside the container to the outside when the lid is closed, or an outlet hole for draining liquid from inside the container when the lid is closed. This is the gist of it. [Explanation of symbols]

[0059] 1 Lid 2. Canopy 3. Side wall section 4 Internal material 5 Discharge hole 6. Drinking spout 7 Insertion part 8 Liquid escape wall

Claims

1. A lid for closing the opening of a container that holds liquids, A canopy made of a paper-based material with through-holes formed that penetrate both the inside and outside, It is formed separately from the canopy portion and comprises an internal member provided on the lower surface side of the canopy portion, The internal member comprises an insertion portion that connects the lid portion and the inner surface of the container, and a liquid-receiving wall formed around the insertion portion. The insertion portion is formed to have an opening, The through hole is formed to be smaller than the insertion portion. The liquid-receiving wall is formed to completely surround the insertion portion, is formed continuously in the circumferential direction, and further protrudes from the surface of the inner member toward the inner surface of the container. The lid is characterized in that the lower end of the liquid-receiving wall is positioned below the position of the through-hole.

2. The cover according to claim 1, wherein the insertion portion is provided at a position that overlaps with the position of the through hole formed in the top cover.

3. The lid according to claim 1 or 2, comprising a side wall formed surrounding the canopy portion, wherein the side wall is made of a blank material made of paper.

4. Multiple through holes are formed, The lid according to any one of claims 1 to 3, wherein the liquid-receiving wall is formed for each of the plurality of through holes.

5. The canopy portion has an opening for drinking. The lid according to any one of claims 1 to 4, wherein the internal member has a drinking spout insertion portion formed at a position overlapping with the drinking spout portion, and a drinking spout liquid relief wall is formed around the drinking spout insertion portion.

6. The lid according to claim 3, wherein the lower end position of the liquid-receiving wall is at the same position as the lower end position of the side wall or is located above the lower end position of the side wall.

7. The lid according to any one of claims 1 to 6, wherein the through-hole is an insertion hole formed to allow a straw-like object to be inserted, an outlet hole for releasing gas from inside the container to the outside when the lid is closed, or an outlet hole for draining liquid from inside the container when the lid is closed.

8. The canopy portion has a top surface portion, The aforementioned top portion has a surface, The lid according to any one of claims 1 to 7, wherein the surface is formed in a planar shape.

9. The lid according to any one of claims 1 to 8, wherein the lower end of the liquid-receiving wall is configured to be continuously connected.

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