Cover, combination of container and cover, and container with cover

Abstract

Provided is a lid, a combination of a container and the lid, and a container with a lid, which can ensure the airtightness of the container and facilitate the discharge of the content from the mouth of the lid. The lid includes a top lid that can be closed relative to the container. The top lid has a mouth forming portion, which has a mouth that communicates the inside and outside of the top lid and a lid piece formed to be able to open and close the mouth via a hinge portion. A joint portion for engaging with a sealing member is formed on the lid piece. The sealing member has one end portion where the joint portion is formed, the other end portion relative to the one end portion, and a gripping portion formed on the other end portion. A holding portion for holding the lid piece in a state where the mouth is open is formed on one of the top lid and the sealing member, and a holding receiving portion for holding the holding portion in a state where the mouth is open is formed on the other of the top lid and the sealing member.

Description

[0001] This divisional application of the invention application has an international filing date of January 12, 2021, an international application number of PCT / JP2021 / 000737, a national application number of 202180005456.5 upon entry into the Chinese national phase, and an invention title of "Cover". Technical Field

[0002] The present invention relates to a cover formed so as to be able to seal the mouth of a container. Background Art

[0003] In convenience stores, supermarkets, etc., various food and beverages such as various drinks and prepared foods are put into simple containers and then sold. Conventionally, in these stores, products in which food and beverages are pre-packed in containers and the mouths of the containers are sealed with covers are often displayed in front of the store for sale. However, in recent years, in addition to this form of sale, sales in which purchasers fill various drinks such as coffee into cup-shaped containers in the store and then take them home with the lids on have also been widely carried out. Therefore, regarding the covers in recent years, various covers have also been proposed in which the contents of the container (such as various drinks like coffee) do not spill when held by hand, as compared with the past.

[0004] Such covers have widely used molded products made of plastic materials. However, in recent years, since there are concerns that plastic products may cause various environmental problems, there has been a widespread call to reduce the amount of plastic materials used as raw materials for forming simple containers and covers for food and beverages that are used up and discarded in a short time. Therefore, in recent years, covers made of pulp materials or paper materials have also been proposed to replace covers made of plastic materials (for example, Patent Documents 1 and 2).

[0005] Prior Art Documents

[0006] Patent Documents

[0007] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2006-248530

[0008] Patent Document 2: Japanese Unexamined Patent Application Publication No. 2020-116366 Summary of the Invention

[0009] However, generally, compared with plastic materials, paper materials have lower elasticity and formability of raw materials, and it is difficult to be formed into a complex shape like plastic materials. Therefore, it is not easy to form a cover made of pulp material or paper material that can reliably seal the mouth of the container like a cover made of plastic material, has good airtightness inside the container when sealing, and has a shape and structure that has no concern of leakage to the outside of the container even when the contents of the container are liquid.

[0010] Conventionally, various efforts have been made in the structure of lids that use paper materials to improve the tightness to the mouth of the container. In the above-mentioned Patent Document 1, a lid is disclosed that is configured to have a wall surface portion and a top lid portion and is fitted inside the mouth of the container. The wall surface portion has an outer surface with a conical shape that engages with the inner surface of the conical main body portion of the paper container, and the top lid portion is surrounded by the wall surface portion. In addition, Patent Document 2 discloses a lid formed of pulp-molded paper for use as a beverage cup lid. Further, the lid disclosed in Patent Document 2 is formed with a beverage outlet in an opening manner so that the contents of the container (such as beverages like coffee) can be discharged to the outside of the container even when it is sealed.

[0011] However, regarding the lid disclosed in Patent Document 1, it is difficult to say that the tightness between the mouth of the container and the wall surface portion of the lid is sufficient during capping, and there is a concern that the liquid inside the container may leak. In the case of a paper lid or container, due to the characteristics of the paper material, it is easily affected by humidity and the like, resulting in dimensional deviations in the lid or the mouth of the container. On the other hand, conventional paper lids are formed with a structure where the portion that engages with the mouth of the container overlaps with the side wall and the top lid, or the side wall is reinforced with a reinforcing material. Therefore, the portion that fits into the mouth of the container becomes hard and lacks elasticity. Thus, when there are slight dimensional deviations in the lid or the mouth of the container, there are problems such as being unable to reliably cap the container and difficulty in ensuring stable airtightness.

[0012] In addition, as in the lid disclosed in Patent Document 2, in many cases, a beverage outlet is formed in the lid in an opening manner when the contents of the container are beverages, for example. However, if a beverage outlet is formed in this way, even if the airtightness between the container and the lid is ensured, there is a problem of a concern that the contents may suddenly splash out from the beverage outlet during carrying. To solve such a problem, it can be considered that the problem can be solved as long as the structure is such that the beverage outlet can be blocked even during carrying. However, if the beverage outlet is blocked in this way, the beverage outlet that has been blocked must be opened again when drinking the contents next time, etc., resulting in other problems such as an increase in complexity. Regarding this problem, it can also be considered to press the blocking body (cover piece) that blocks the beverage outlet into the container to open the beverage outlet. However, it is hardly hygienic to open the beverage outlet by pressing the cover piece into the container in this way. In addition, for opening the beverage outlet by pulling the cover piece outward, there are also problems such as the operation of pulling the cover piece becoming cumbersome, or the structure or shape of the lid itself having to be made complex in order to make it easy to pull the cover piece.

[0013] The present invention has been made in view of such problems, and its object is to provide a lid that can ensure the airtightness of the container and make it easy for the contents to be discharged from the mouth of the lid.

[0014] The gist of the present invention is:

[0015] (1) A lid body includes a top lid made of a paper raw material. The lid body is characterized in that the top lid has: an opening that connects the inside and outside of the top lid; a lid piece formed to be able to open and close the opening; and a holding portion that holds the lid piece in a state where the opening is open. The lid body includes a holding and receiving portion that holds the holding portion in a state where the opening is open.

[0016] (2) In the lid body described in (1) above, a sealing member for pulling up the lid piece to open the opening is connected to the lid piece.

[0017] (3) In the lid body described in (2) above, the holding portion is formed on the sealing member.

[0018] (4) In the lid body described in (1) above, the holding portion is formed in a claw shape, the holding and receiving portion is formed in a notch shape on the top lid, and the holding portion is formed to be able to be inserted into the holding and receiving portion.

[0019] (5) In the lid body described in (1) above, a surrounding side wall portion formed to surround the periphery of the top lid is provided, and the holding and receiving portion is formed on the side wall portion.

[0020] (6) In the lid body described in (5) above, the holding and receiving portion is the side wall portion.

[0021] Advantages of the Invention

[0022] According to the lid body of the present invention, a top lid made of a paper raw material is provided. The top lid has: an opening that connects the inside and outside of the top lid; a lid piece formed to be able to open and close the opening; and a holding portion that holds the lid piece in a state where the opening is open. A holding and receiving portion that holds the holding portion in a state where the opening is open is provided. Therefore, by operating the holding portion to pull up the lid piece, the opening will open, and the inside and outside of the top lid will be connected. And since the holding portion is held by the holding and receiving portion, the state where the opening is open can be maintained. At this time, since the holding portion is held by the holding and receiving portion, the position of the lid piece can be held in a fixed position. For example, when the user performs an action of tilting the container with the lid body installed to pour out the contents of the container from the opening (such as when drinking a beverage, etc.), the lid piece will not fall toward the opening and can maintain a fixed position. Therefore, when the container with the lid body installed is tilted, the lid piece will not touch the user's face (such as the nose, etc.) and will not cause discomfort to the user, and the action of pouring out the contents (the action of drinking a beverage) can be performed comfortably.

[0023] In addition, with the lid body according to the present invention, since the lid piece is lifted by operating the holding portion, the mouth portion can be opened without contacting the back side of the lid piece. Therefore, since the user's fingers also do not contact, for example, the contents adhering to the back of the lid piece, the operation can be performed comfortably when opening the mouth portion. In addition, since the lid body can lift the lid piece only by operating the holding portion, the lid piece can also be lifted with a simple operation.

[0024] Moreover, with the lid body according to the present invention, by operating the holding portion in the state held by the holding and receiving portion, the lid piece can also be moved in the direction of closing the mouth portion. Therefore, by operating the holding portion, the lid piece can be simply opened and closed multiple times. Thus, in the case where the contents in the container, such as a beverage, are not finished drinking within a short time, the lid piece can be simply closed, and the closed state can also be continuously maintained. In addition, according to the present invention, a lid body that can also consider environmental problems can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 FIG. is an embodiment of the lid body of the present invention, and is an external perspective view of the lid body in a state where the lid piece is closed.

[0026] Figure 2 FIG. is an external perspective view of the lid body in a state where the lid piece is opened.

[0027] Figure 3 FIG. is a top view of the lid body in a state where the lid piece is closed.

[0028] Figure 4 FIG. is a top view of the lid body in a state where the lid piece is opened.

[0029] Figure 5 is Figure 1 a longitudinal sectional view taken along line A-A of the lid body in

[0030] Figure 6 a partial enlarged sectional view of the lid body.

[0031] Figure 7 FIG. is an explanatory diagram for explaining the effect when opening the lid piece of the lid body.

[0032] Figure 8 FIG. is an explanatory diagram showing the state of installing the lid body on a container.

[0033] Figure 9 FIG. is an explanatory diagram for explaining the effect when installing the lid body on a container.

[0034] Figure 10 FIG. is an explanatory diagram showing the state of stacking the lid bodies.

[0035] Figure 11It is an explanatory diagram for other ways of forming the drinking opening portion.

[0036] Figure 12 It is an explanatory diagram for other ways of the sealing member connected to the cover sheet.

[0037] Figure 13 It is an explanatory diagram for other ways of the sealing member connected to the cover sheet.

[0038] Figure 14 It is an explanatory diagram and a perspective view showing another other way of the sealing member.

[0039] Figure 15 It is showing the use of Figure 14 A perspective view of the state where the cover sheet is opened by the sealing member shown.

[0040] Figure 16 It is a top view showing another other way of the sealing member.

[0041] Figure 17 It is showing the use of Figure 16 A top view of the state where the cover sheet is opened by the sealing member shown.

[0042] Figure 18 It is a top view showing another other way of the sealing member.

[0043] Figure 19 It is showing the use of Figure 18 A top view of the state where the cover sheet is opened by the sealing member shown.

[0044] Figure 20 ]]It is a top view showing another other way of the sealing member.

[0045] Figure 21 It is showing the use of Figure 20 A top view of the state where the cover sheet is opened by the sealing member shown.

[0046] Figure 22 It is for explaining the effect when opening the cover sheet using the sealing member shown in Figure 20 and Figure 21 An explanatory diagram.

[0047] Figure 23 It is a perspective view of the appearance of the cover body showing another other way having a holding and receiving portion.

[0048] Figure 24 It is a longitudinal sectional view showing another other way of the sectional structure of the cover body.

[0049] Figure 25 It is a longitudinal sectional view showing another other way of the sectional structure of the cover body.

[0050] Figure 26 is a longitudinal sectional view of a cross-sectional structure of another way of showing the lid body.

[0051] Figure 27 is a longitudinal sectional view of a cross-sectional structure of another way of showing the lid body.

[0052] Figure 28 is a longitudinal sectional view of a cross-sectional structure of another way of showing the lid body.

[0053] Figure 29 is a longitudinal sectional view of a cross-sectional structure of another way of showing the lid body.

[0054] Figure 30 is a longitudinal sectional view of a cross-sectional structure of another way of showing the lid body. Detailed implementation mode

[0055] Hereinafter, the lid body of the present invention will be described in detail based on the drawings. In addition, regarding the lid body of the present invention, a lid body used for a container (cup) that contains various beverages such as a coffee cup is taken as an example for description, but it is not limited to the lid body of a container that contains beverages, and it can also be applied as the lid body 1 of a container that stores foods other than beverages. In addition, the lid body of the present invention can also be applied as the lid body of a container that is suitable for storing various items other than food items, such as parts such as bolts or nuts, and items other than the above. In addition, as the lid body of the present invention, an example of a lid body having a circular shape when viewed from above is used for description, but the shape of the lid body is not limited to a circular shape, and it can also be applied to shapes other than a circular shape such as an elliptical shape, a rectangular shape, a triangular shape, a polygonal shape, a chamfered rectangular shape, and a chamfered polygonal shape.

[0056] As Figures 1 to 6 shown, the lid body 1 is formed by a top lid 2 and a side wall 3 formed in an annular shape surrounding the top lid. The side wall 3 is formed by joining both end portions of a paper raw material into an annular shape and forming it into a cylindrical shape. In addition, the side wall 3 is formed in a tapered shape from the upper end side toward the lower end side. In addition, here, the "tapered shape" means that the shape of the outer wall of the side wall 3 is formed in a tapered shape as a whole from the upper end side toward the lower end side. In this "tapered shape", in addition to including a shape in which the size of the outer wall of the side wall 3 gradually becomes smaller from the upper end side toward the lower end side, it also includes a shape in which even if a bulging portion or a protruding portion or the like is provided on a part of the outer wall of the side wall 3 or these bulging portions or protruding portions are formed, the outer wall of the side wall 3 still becomes a tapered shape as a whole. In addition, even a shape in which a part of the side wall 3 is a straight cylindrical shape that is not formed in a tapered shape but the outer wall of the side wall 3 as a whole becomes a tapered shape is included in this "tapered shape". That is, the "tapered shape" mentioned here is a concept that includes a state in which as long as the shape of the outer wall of the side wall 3 is a tapered shape as a whole side wall, even if a part of the outer wall is a shape different from the tapered shape.

[0057] The top cover 2 is bent at the periphery to form a standing portion 4. In addition, the side wall 3 has an upper wall 5 and a lower wall 6. The top cover 2 and the side wall 3 are integrated by joining the standing portion 4 of the top cover 2 to the inner surface side of the upper wall 5 of the side wall 3. As Figure 8 shown, a locking portion 7 in the shape of an annular groove is formed on the lower wall 6 of the side wall 3, and the locking portion 7 is formed in a shape that engages with a curled portion 103 provided at a container mouth portion 102 formed on a container 101. The locking portion 7 is not limited to being formed in the shape of an annular groove, and can be formed in any shape as long as it can engage with the curled portion 103 of the container 101. In addition, if the inner peripheral surface of the lower wall 6 of the side wall 3 is extruded and pressed to form the locking portion 7 in the shape of an annular groove, the layer difference at the joint portion of the locking portion 7 formed on the lower wall 6 of the side wall 3 formed by joining the two ends of a rectangular or fan-shaped paper raw material can be reduced, and it is difficult to form a gap between the lid 1 and the container 101, and the sealing performance based on the lid 1 during capping is improved. In addition, in Figures 1 to 6 the example shown, although the outer side surface (the outer side surface of the lower wall 6) of the locking portion 7 in the shape of an annular groove formed by extrusion and pressing or the like is formed in a bulging manner, it may also be the case where the locking portion in the shape of an annular groove is formed on the inner surface side of the lower wall 6 and the outer side surface of the lower wall 6 is not formed in a bulging manner. In order to reduce the layer difference at the joint portion of the side wall 3, before joining the two ends of the rectangular or fan-shaped paper raw material used to form the side wall 3, the vicinity of the two ends may be compressed in such a way that the thickness gradually becomes thinner toward the edge portion (the circumferential direction of the side wall 3), and then the two ends are joined to form the side wall 3. In addition, for the sake of convenience of explanation, in Figures 8 to 10 the description of the sealing member to be described later is omitted.

[0058] In the lid 1 of the present embodiment, the side wall 3 is formed in a surrounding shape by joining the two ends of a fan shape whose arc length on the upper end side is longer than the arc length on the lower end side. Therefore, the side wall 3 is formed such that the side surface is tapered as a whole from the upper end side toward the lower end side (in the direction of the container mouth portion 102 of the container 101) (tilted as a whole in the direction of arrow a Figure 8 shown), and the inner dimension of the lower end side of the locking portion 7 is smaller than the inner dimension of the upper end side of the locking portion 7.

[0059] Regarding the lid 1 of the present embodiment, since the side wall 3 is formed in a tapered and inclined shape, so as Figure 10When stacking multiple lids 1 as shown, the stackability is excellent. That is, the lid 1 of the present embodiment can be stored and transported in a smaller space by stacking multiple lids 1 vertically, thereby reducing the costs during storage and transportation. The side wall 3 is not limited to the case where the entire side surface is formed in an inclined shape. It can also be that only a part of the side wall 3, for example, the upper end side or the lower end side of the side wall 3, is formed in an inclined shape. Additionally, different inclination angles can be formed on the upper end side and the lower end side of the side wall 3. Moreover, the lid 1 of the present embodiment can also be formed into a non-inclined cylindrical shape by forming the side wall 3 in a surrounding shape with a rectangular paper raw material. Also, by forming it with a paper raw material in an inverted fan shape, it can be formed into an inclined shape opposite to the case shown in Figure 10 , but the side wall 3 is preferably set to a non-inclined shape, or as shown in Figure 10 , it is set to a structure that tapers to the container opening 102 of the container 101 at an inclination angle according to the side wall 104 of the container 101. Among them, by setting the side wall 3 to a cylindrical shape with the side surface inclined in a way that tapers from the upper end side to the lower end side, the stackability of the lid 1 is improved, and the sealing property and airtightness of the lid 1 with respect to the container 101 are more excellent.

[0060] The joining of the two ends of the paper component forming the cylindrical side wall 3 in the lid 1 and the joining of the top cover 2 and the side wall 3 can be joined and integrated using joining methods known in the art. As joining methods, common adhesives, hot melt adhesives, two-component adhesives, heat sealing, ultrasonic joining, high-frequency joining, etc. can be listed. From the perspective of manufacturing efficiency, it is preferably to form the joining surfaces of the top cover 2 and the side wall 3 with a raw material having heat-sealing properties and perform heat-sealing joining.

[0061] Figure 8 shows a state where the lid 1 covers the container 101 and seals the container opening 102 of the container 101. Figure 9Shows a state in the middle of covering the lid 1 on the container 101. The lid 1 of the present embodiment is formed in such a manner that the engaging portion 7 engages with the curled portion 103 of the container 101. The engaging portion 7 is formed as an annular groove on the inner wall side of the lower wall 6. The lid 1 of the present embodiment is formed in a structure such that when the engaging portion 7 engages with the curled portion 103 of the container 101, the lower end portion 8 of the lower wall 6 does not contact the side wall 104 of the container 101. The lid 1 of the present invention can not only seal the container 101 with high airtightness, but also can be easily removed from the container 101 because the lower wall 6 has elasticity. In addition, since the lid 1 is designed such that the lower end portion 8 of the lower wall 6 does not contact the side wall 104 of the container 101 when installed on the container 101, when removing the lid 1 from the container 101, by placing a finger or the like on the lower end portion 8 of the lower wall 6 and pulling up the lower wall 6, the engagement between the curled portion 103 of the container mouth portion 102 of the container 101 and the engaging portion 7 of the lid 1 will be disengaged. And by further pulling up the lid 1 upward, the lid 1 can be more easily removed from the container 101.

[0062] The lid 1 of the present invention has a structure in which an engaging portion 7 that engages with the container mouth portion 102 of the container 101 is formed on the lower wall 6 of the side wall 3 formed by forming a paper raw material in an annular shape. In addition, the lower wall 6 of the side wall 3 provided with the engaging portion 7 has excellent elasticity compared to the case where the lower wall 6 of the side wall 3 is folded and joined to the top lid 2. Therefore, even if the diameter of the engaging portion 7 of the lid 1 is designed to be smaller than the outer diameter of the curled portion 103 of the container 101, the lid 1 can be reliably engaged with the container 101. In addition, by designing the diameter of the engaging portion 7 to be smaller than the outer diameter of the curled portion 103 of the container 101 in this way, even when the pressure in the space portion 105 becomes high due to storing liquid products such as coffee, especially hot liquid products, etc. in the space portion 105 formed in the container 101, there is no concern that the lid 1 is likely to fall off, and the container 101 can be sealed while maintaining high airtightness, and can be sealed with high airtightness complementarily with the side wall 3 being tapered from the upper end side to the lower end side as a whole.

[0063] In addition, since the lower wall 6 of the side wall 3 of the lid 1 of the present invention has elasticity, even if there is an error in the size of the container mouth portion 102 of the container 101, the container mouth portion 102 of the container 101 can be reliably closed and high airtightness can be maintained. In addition, since the side wall 3 is tapered from the upper end side to the lower end side, and the erected portion 4 formed in an expanded and inclined shape is joined to the inner surface 5a of the upper wall 5 of the side wall 3 to join and integrate the top lid 2 and the side wall 3, the joining strength between the erected portion 4 of the top lid 2 and the inner surface of the upper wall 5 of the side wall 3 is improved. In particular, regarding Figure 1The lid 1 shown, etc. forms a folded portion 9 formed by folding the upper wall 5 of the side wall 3 toward the inner surface 4a side of the upright portion 4, and the inner surface 4a of the upright portion 4 and the opposite surface 9a of the folded portion 9 opposite to the inner surface 4a are joined. Therefore, the joining strength between the above-mentioned top lid 2 and the side wall 3 is further improved. Therefore, even when a load force is applied to the lid 1, it is difficult for the lid 1 to be distorted, etc., and there is no concern that the engaging portion 7 will become disengaged from the curled portion 103 of the container 101. Even when the internal pressure of the sealed container 101 increases when hot drinks, etc. are stored, the risk of the lid 1 falling off from the container 101 is extremely low.

[0064] Generally, the larger the size of the lid 1 of the top lid 2, the more likely the top lid 2 is to be distorted due to the load applied to the lid 1. However, by forming the side wall 3 in a tapered shape that slopes from the upper end side toward the lower end side and joining the upright portion 4 formed in an expanded and inclined shape on the inner surface of the upper wall 5 of the side wall 3 as in the lid 1 of the present invention, and further by forming a structure in which the upright portion 4 and the folded portion 9 are joined, even in the case of a large lid, the risk of the lid 1 falling off from the container 101 due to the load applied to the lid 1 is reduced. The lid 1 of the present invention forms the size between the lower joining points 10 of the joining portion of the upright portion 4 of the top lid 2 and the upper wall 5 of the side wall 3 (the diameter of the lower joining point 10 in the case of a circular top lid 2) to be larger than the size between the lower end portions 8 of the engaging portion 7 (the inner diameter of the lower end portion of the engaging portion 7 in the case of a circular top lid 2), and can maintain a reliable capping state. The lid 1 of the present embodiment forms a joining portion of the upper wall 5 of the side wall 3 and the upright portion 4 of the top lid 2 as a protruding wall on the upper side of the top lid 2, and this protruding wall can be used as a mouth contact portion when drinking beverages and as a spill prevention wall for beverages when the content of the container 101 is a beverage such as coffee.

[0065] The container 101 is not limited to a container having a shape in which the side wall 104 is inclined, such as a coffee cup or a cup noodle container, and can also be a cylindrical container such as a nut can. The lid 1 of the present invention can be used in various containers such as paper containers, plastic containers, foamed plastic containers, and metal cans, and is not limited to containers for storing liquid substances. It can also be used as a lid for containers for storing dry foods, etc. and non-food containers, etc. The lid 1 of the present invention can be used as a lid for containers such as coffee cups, cup noodles, nut cans, etc., as well as for containers for soup, yogurt, ice cream, various cooked foods, bento boxes, etc., but is not limited to containers for food and beverages, and can be used as a lid for all containers.

[0066] Regarding the lid body 1 of the present embodiment in which the side wall 3 is formed in a tapered shape sloping downward from the upper end side to the lower end side, the inclination angle α of the side wall 3 of the lid body 1 and the inclination angle β of the side wall 104 of the container 101 may be the same or different. In the case of being different, the inclination angle α of the side wall 3 may be larger or smaller than the inclination angle β of the side wall 104 of the container 101. In the case where the inclination angle α is smaller than the inclination angle β (in the case of a larger inclination), the fitting force of the lid body 1 to the container 101 becomes higher, and the airtightness is further improved. In order to improve the airtightness of the lid body 1, the magnitude of the inclination angle α of the side wall 3 of the lid body 1 relative to the inclination angle β of the side wall 104 of the container 101 can be arbitrarily changed according to the size of the container 101 (the size of the lid body 1), etc. In addition, in the case of a non-circular container such as a polygonal container, by changing the inclination angle α of the side wall 3 of the lid body 1 according to the shape of the container portion into which the lid body 1 is inserted, it is also possible to prevent the airtightness from changing due to differences in the container portion.

[0067] The lid body 1 of the above-described embodiment is formed such that the upper wall 5 of the side wall 3 and the erected portion 4 of the top lid 2 have the same height, but it is not limited to the case where the upper wall 5 of the side wall 3 and the erected portion 4 of the top lid 2 are formed to have equal heights. It is also possible that one of the upper wall 5 of the side wall 3 and the erected portion 4 of the top lid 2 is formed shorter than the other.

[0068] As the paper raw material for the side wall 3 constituting the lid body 1 of the present invention, in addition to the so-called paper obtained by scooping up the pulp of the fiber raw material onto a net, drying or extrusion drying, and forming into a sheet after papermaking, the so-called airlaid sheet obtained by stacking fibrillated fiber raw materials such as pulverized pulp obtained by pulverizing raw material pieces composed of pulp-like fibers by an air stream and fixing the fibers of the stacked body to each other with an adhesive, etc., the so-called paper made by cementing plant fibers and other fibers, etc., chemical fiber paper, synthetic paper, water-resistant paper, coated paper, alternative paper, parchment paper, wool paper, glass fiber paper, stone paper, ceramic paper, etc., and paper obtained by laminating multiple sheets of these papers can also be cited. As the paper raw material, in addition to being composed of only pulp, it may contain fibers such as non-pulp natural fibers, synthetic fibers, and recycled fibers, but it is preferably 50% by mass or more of pulp, more preferably 70% by mass or more of pulp, still more preferably 80% by mass or more of pulp, and particularly preferably composed of 100% pulp. The paper raw material can use film, non-woven fabric, wood foil and other woody raw materials of synthetic resin or natural resin, etc., and can also use composite materials with raw materials such as aluminum foil, etc. However, in the case of being a composite material, it is preferably 50% by mass or more of pulp as the whole composite material, and particularly preferably 80% by mass or more of pulp. Since the higher the pulp content, the easier the paper raw material is to biodegrade, it is preferred.

[0069] As pulp, wood pulp, non-wood pulp, waste paper pulp, synthetic pulp, etc. can be cited. More specifically, pulp that is appropriately selected and used from the following can be cited: mechanical pulp (MP) such as groundwood pulp (GP), stone groundwood pulp (SGP), refiner groundwood pulp (RGP), pressure groundwood pulp (PGW), thermomechanical pulp (TMP), chemi-thermomechanical pulp (CTMP), bleached chemi-thermomechanical pulp (BCTMP), etc., chemigroundwood pulp (CGP), semi-chemical pulp (SCP), kraft pulp (KP) such as bleached kraft softwood pulp (LBKP), bleached kraft coniferous pulp (NBKP), etc., alkaline pulp (AP), sulfite pulp (SP), dissolving pulp (DP), etc. chemical pulp (CP), synthetic pulp made from nylon, rayon, polyester, polyvinyl alcohol (PVA), etc., slush pulp (TP), rag pulp made from cotton, linen, hemp, jute, abaca, ramie, etc., straw pulp, esparto pulp, bagasse pulp, bamboo pulp, kenaf pulp, etc. stalk pulp, auxiliary pulp such as bast pulp, etc. As pulp, softwood pulp such as Japanese red pine, Sakhalin fir, Sitka spruce, Douglas fir, hemlock, spruce, etc., hardwood pulp such as beech, oak, birch, eucalyptus, poplar, alder, etc., wood pulp such as a mixture of softwood pulp and hardwood pulp, non-wood pulp such as kenaf, bagasse pulp, bamboo pulp, cereal pulp, straw pulp, abaca pulp, cotton pulp, etc., waste paper pulp, etc. can be used. Since the fiber length of softwood pulp is longer than that of hardwood pulp, the degree of entanglement between the fibers of the paper material using pulp with a long fiber length such as softwood pulp is increased. In addition, the shredded pulp obtained by shredding raw material pieces using softwood pulp, etc. also has a longer fiber length than the shredded pulp obtained by shredding raw material pieces composed of hardwood pulp. Therefore, the strength of the paper raw material is increased by the entanglement between the fibers.

[0070] The paper raw material preferably has water resistance, and raw materials that have been previously given water resistance such as water-resistant paper can also be used, or raw materials having a coating provided at least on the surface of the paper raw material on the container side can be used. The coating can be provided by laminating a film or coating a coating agent.

[0071] As the resin for forming the coating, it is possible to use, for example, polystyrene, polyethylene, polypropylene, polyethylene terephthalate, polyurethane, polyvinyl chloride, polyvinylidene chloride, polyvinyl acetate, cyanoacrylate, epoxy resin, polyacrylic resin, polymethacrylic resin, nylon, polycarbonate; starch-based resins such as polycaprolactone, polyhydroxyalkanoate, polyhydroxybutyrate, polylactic acid, and esterified starch, cellulose acetate, polyethylene succinate, polyvinyl alcohol, polyglycolic acid, chitosan / cellulose / starch, poly(hydroxybutyrate / hydroxyhexanoate), poly(caprolactone / butylene succinate), polybutylene succinate, poly(butylene succinate / adipate), poly(butylene succinate / carbonate), poly(ethylene terephthalate / succinate), poly(butene adipate / butylene terephthalate), poly(tetramethylene adipate / butylene terephthalate) and other natural degradable resins or natural degradable resin mixtures; natural degradable biomass resins or mixtures of natural degradable biomass resins; fluororesins, silicone resins, ultraviolet curable resins, ethylene-vinyl acetate copolymers, ethylene-vinyl alcohol copolymers, ethylene-propylene copolymers, ethylene-propylene-diene copolymers, acrylic-styrene copolymers, styrene-butadiene copolymers, acrylonitrile-butadiene-styrene copolymers, etc., copolymers of monomers constituting the above resins, natural resins, paraffin, gelatin, cellophane, poly-4-methyl-1-pentene, etc. The coating is preferably a natural degradable resin such as polylactic acid, polycaprolactone, polyhydroxyalkanoate, starch-based resins, natural degradable biomass resins, natural resins, etc. or formed from them.

[0072] As the natural degradable resin, natural resins, natural degradable plastics, and biomass plastics can be cited. As the natural degradable plastics and biomass plastics, it is possible to cite, for example, polycaprolactone, polyhydroxyalkanoate, polyhydroxybutyrate, polylactic acid, starch-based resins such as esterified starch, cellulose acetate, polyethylene succinate, polyvinyl alcohol, polyglycolic acid, chitosan / cellulose / starch, poly(hydroxybutyrate / hydroxyhexanoate), poly(caprolactone / butylene succinate), polybutylene succinate, poly(butylene succinate / adipate), poly(butylene succinate / carbonate), poly(ethylene terephthalate / succinate), poly(butene adipate / butylene terephthalate), poly(tetramethylene adipate / butylene terephthalate) and other natural degradable resins or natural degradable resin mixtures.

[0073] In addition, the natural degradable resin may also contain lubricants such as stearamide, fatty acid esters, fatty acid metal salts, fatty acids, oils and fats, glycerol fatty acid esters; stabilizers such as triphenyl phosphate, phthalic anhydride, tributyl phthalate, acetic anhydride; inorganic materials such as titanium dioxide, kaolin, mica, bentonite, diatomaceous earth, magnesium oxide, silica alumina, calcium carbonate, calcium hydroxide, shell powder; surfactants such as higher fatty acid amides, nonionic surfactants, glycerol fatty acid esters; foaming agents such as citric acid, sodium bicarbonate, butane; other materials such as antistatic agents, hot melt adhesives, etc., which are additives recorded in the positive list of the Japan Bioplastics Association.

[0074] In addition, "natural degradability" refers to the property of being decomposed by microorganisms, ultraviolet rays, climate change, etc. in one of air, soil, and water, thereby being able to reduce the environmental load. In addition, the lid of the present invention is not limited by the content of the container to which the lid is installed, and can be applied to lids for closing containers that can hold all kinds of contents.

[0075] The top lid 2 in the lid 1 of the present invention can be made of the same paper raw material as the side wall 3, but in addition to the paper raw material, it can also be made of a film or a sheet. If the top lid 2 is made of a film or a sheet, since it has higher flexibility than the case where the top lid 2 is made of a paper raw material, the lid 1 is more easily inserted into the container 101. In addition, if it is made of a transparent film or sheet, when installed on the container 101, it is possible to easily visually confirm the contents in the container 101. As the film or sheet, for example, polyvinyl chloride, polyvinylidene chloride, polyurethane, polyethylene terephthalate (PET), olefin resins such as polyethylene or 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 resins and their composites can be used, but materials with biodegradability such as polyvinyl acetate, polylactic acid, polycaprolactone, polyhydroxyalkanoate, starch resins are preferred. In addition, materials obtained by forming an aluminum layer on paper or the like by vapor deposition or the like, or laminates having an aluminum layer provided on the surface of paper or the like and having polyethylene, polypropylene, etc. provided on one or both sides thereof can also be used. When the top lid 2 is made of a film or a sheet, if a material that is difficult to heat-seal such as PET is used, coating the surface joined to the side wall 3 with, for example, polyethylene, polypropylene (OPP, CPP, etc.) can facilitate the joining based on heat sealing.

[0076] Regardless of whether the lid 1 of the present invention is made of a paper raw material to form the top lid 2 or made of a film or sheet, when the side of the top lid 2 that contacts the mouth of the container 101 is made of a heat-sealable raw material, the top lid 2 can be joined to the mouth of the container 101 (the curled portion 103 of the container 101 in the form shown in Figure 3 ) by heat sealing, or the lid 1 can be removed from the container 101 while unsealing it during use. Thus, the contents can be blocked from the external gas before using the contents of the container 101. When the top lid 2 is made of a film or sheet, it is preferable to use a material with gas permeability resistance and moisture permeability resistance to improve the barrier property against the external gas.

[0077] When sealing the container 101 with the lid 1 of the present invention, first, as shown in (a) of Figure 14 , the engaging portion 7 on one end side of the lid 1 is inserted into the curled portion 103 of the container 101. Then, as shown in (b) of Figure 14 , the engaging portion 7 is successively inserted into the curled portion 103 toward the opposite side of the lid 1 to lift the top lid 2, and the engaging portion 7 on the other end side of the lid 1 is inserted into the curled portion 103 of the container 101, thereby enabling the lid 1 to be inserted into the container 101 for sealing. The lid 1 of the present invention has flexibility as a whole, and the lower wall 6 of the side wall 3 has elasticity in the wall thickness direction. Therefore, even when the inner dimension of the lower end portion of the lower wall 6 is smaller than the outer dimension of the mouth of the container 101, the lid 1 can be inserted into the container 101, and the inner surface of the lower wall of the container mouth (curled portion 103) and the lower surface of the top lid are closely adhered to reliably seal the container 101 with high tightness. The lid 1 of the present invention is not limited to a container having a curled portion and can be inserted into the container mouth to maintain high tightness.

[0078] Next, the structure of the mouth forming portion 11 and the like in the top lid 2 will be described. As shown in Figure 1 and the like, the mouth forming portion 11 has a mouth 12 and a lid piece 13, and is formed in such a way that the lid piece 13 closes the mouth 12 as shown in Figure 1 and Figure 3 , and the lid piece 13 opens and the mouth 12 opens as shown in Figure 2 and Figure 4 . The mouth 12 constituting the mouth forming portion 11 is formed so as to communicate the inside and outside of the top lid 2 and penetrate between the front surface 2a and the back surface 2b of the top lid 2. This mouth 12 is used, for example, to form an entrance and exit for the contents (such as beverages or foodstuffs) in the space portion 105 of the container 101 in an open state when the lid 1 is installed on the container 101. As shown in Figure 1As shown, etc., the mouth forming portion 11 is provided in the top cover 2 at a predetermined position offset from the central portion of the top cover 2 in the outward direction. In addition, the lid piece 13 formed on the top cover 2 is formed such that one end portion 13a located at a position a predetermined distance away from the central portion of the top cover 2 toward the outside is a free end, and the other end portion 13b located at a position closer to the center than the one end portion 13a is a fixed end. A hinge portion 14 is formed at the other end portion 13b, and the lid piece 13 is formed so as to be able to open and close via the hinge portion 14. That is, the mouth forming portion 11 is configured such that the one end portion 13a performs an opening action or a closing action with respect to the top cover 2 with the hinge portion 14 in the other end portion 13b of the lid piece 13 as a fulcrum. In addition, the mouth forming portion 11 forms the mouth 12 in an open state when the lid piece 13 is opened. Further, it is preferable that a fold line 15 is formed at the hinge portion 14 when the lid piece 13 performs an opening and closing action. In addition, the fold line 15 may be formed on the surface 2a side and / or the back surface 2b side of the top cover 2. In this way, by forming the fold line 15 at the hinge portion 14, it is possible to easily perform the opening and closing action of the lid piece 13 based on the fold line 15. Moreover, since the other end portion 13b of the lid piece 13 is bent at the portion where the fold line 15 is formed, it is easy to bend when the hinge portion 14 is bent, that is, when the lid piece 13 is opened, and it can be bent neatly. In other words, by forming the fold line 15, it is possible to prevent the lid piece 13 from being bent with a point other than the portion where the fold line 15 is formed as a fulcrum. In addition, the fold line 15 can be formed into a linear shape by stamping, for example. That is, by linearly stamping a predetermined portion where the fold line 15 is formed using a stamping machine or the like, the fold line 15 can be formed. Since the lid piece 13 is bent only at a specific place where the fold line 15 is formed in this way, the positional deviation of the lid piece 13 being bent can be greatly reduced. In addition, regarding the formation of the fold line 15, any method known in the past can be appropriately selected and used.

[0079] The mouth forming portion 11 is formed such that when the lid piece 13 is opened in a state where the lid body 1 is mounted on the container 101, the space portion 105 of the container 101 can be visually confirmed through the mouth 12. In addition, it is desirable that the portion where the mouth 12 is formed is located outside the inner side wall 106 of the container 101 at one end side end portion 12a (the end portion on the same side as the one end portion of the lid piece 13) of the mouth 12 in a state where the lid body 1 is mounted on the container 101.

[0080] As Figure 1 and Figure 2As shown, the mouth forming portion 11 is formed with a folding line 15 at the portion where the hinge portion 14 is formed, and a cut line 16 is formed at a portion other than the portion where the hinge portion 14 is formed, and is joined to the top cover 2 through a dot-shaped joint portion 17 formed between this cut line 16 and the cut line 16. By forming the mouth forming portion 11 in this way, it is configured such that the state where the cover piece 13 is closed can be maintained by the presence of the dot-shaped joint portion 17 in the state before use, and when pulled by the sealing member 21 described later or lifted by the sealing member 21, the dot-shaped joint portion 17 is cut to release the joint at the dot-shaped joint portion 17.

[0081] In addition, the mouth forming portion 11 may be formed as a half-cut portion in addition to being formed by the cut line 16 and the dot-shaped joint portion 17 as described above. The half-cut portion is formed with a line that can be cut along the shape of the cover piece 13 as a whole (in other words, along the shape of the mouth portion 12 as a whole). When formed as the half-cut portion H (refer to Figure 18 ), there are no longer the cut line 16 and the dot-shaped joint portion 17 as described above, but a cut is formed along the shape of the cover piece 13 (or the mouth portion 12) as a whole. The depth of the cut in the half-cut portion is formed to be thinner than the overall wall thickness of the top cover 2 and not in a manner that penetrates between the front surface 2a and the back surface 2b of the top cover 2 like the cut line 16. In addition, when using these cut line 16, dot-shaped joint portion 17, and half-cut portion H, in this lid body 1, in addition to the case where the half-cut portion H is formed in place of the cut line 16 and the dot-shaped joint portion 17, the cut line 16, dot-shaped joint portion 17, and half-cut portion H can be used separately.

[0082] As Figure 1 and so on show, in the cover piece 13, at the other end portion 13b where the hinge portion 14 is formed, a stress relief portion 18 for reducing the stress generated with respect to the force applied when lifting the cover piece 13 is formed. The stress relief portion 18 is formed such that in Figure 1In the example shown in [figures], in the portion where the hinge portion 14 is formed, it is bent and formed in a direction away from the direction of forming the cover piece 13, that is, in a direction away from the distance between the adjacent cut lines 16. The stress relief portion 18 is formed such that the end portion on the other end side of the cut line 16 is at a position deviated from the radial position where the hinge portion 14 is formed, that is, at a position toward the outside of the radial direction compared to this radial position. By making the position of the end portion on the other end side of the cut line 16 in the stress relief portion 18 the above-mentioned position, it is possible to reduce the magnitude of the stress applied to this position by forming the cut line 16 at a position adjacent to the hinge portion 14. In addition, in order to reduce the magnitude of the stress generated at this position in this way, instead of forming the position on the other end side of the cut line 16 at the same portion as the portion where the hinge portion 14 is formed, it is only necessary to form it such that the position of the end portion on the other end side of the cut line is at a portion different from the portion where the hinge portion 14 is formed. By forming the stress relief portion 18 in this way, it is possible to reduce the stress applied to the end portion side on the other end side of the cut line 16 when the cover piece 13 is opened, and it is also possible to eliminate the defect that the top cover 2 is cracked or damaged while the cover piece 13 is opened.

[0083] In addition, as Figure 6 (a) shown in [figures], the cut line 16 can be formed by cutting perpendicularly from the front surface 2a to the back surface 2b of the top cover 2, or as Figure 6 (b) shown in [figures], it can be formed by cutting from the front surface 2a of the top cover 2 toward the back surface 2b at a specified angle. In the case where the cut is formed perpendicularly from the front surface 2a of the top cover 2 toward the back surface 2b as shown in Figure 6 (a) shown in [figures], it is possible to open the cover piece 13 relatively easily along the cut line 16. In addition, in the case where the cut line 16 is formed by cutting as shown in Figure 6 (b) shown in [figures], the cut surface formed in a slanted shape on the top cover 2 side and the cut surface formed in a slanted shape on the cover piece 13 side are in contact with each other. Therefore, even when trying to lift the cover piece 13, or when it is pushed from the back surface 2b side to the front surface 2a side of the top cover 2 due to a change in the vapor pressure in the space portion 105 when the container 101 is sealed with the lid body 1, the cut surface on the cover piece 13 side and the cut surface on the top cover 2 side will be in contact with each other, making it difficult to open the cover piece 13. Therefore, if the cover piece is formed in this way, it is possible to more effectively prevent the cover piece 13 from suddenly opening. In addition, in the case where the slanted cut surfaces are formed on the top cover 2 side and the cover piece 13 side as shown in Figure 6 (b) shown in [figures], the cut surface on the top cover 2 side is preferably a slanted surface formed such that the end portion of the cut surface on the front surface side is closer to the center than the end portion of the cut surface on the back surface 2b side. In addition, the cut surface on the cover piece 13 side is preferably formed such that the end portion of the cut surface on the back surface 2b side is closer to the outside in the radial direction than the end portion of the cut on the front surface 2a side.

[0084] The mouth forming portion 11 can be formed by arbitrarily selecting a method called so-called punching or a method known from the past equivalent to punching. In addition, in order to form the mouth forming portion 11 in the above punching, it is preferable that the thickness of the punching blade used in the blanking process is 1.0 mm or less. More specifically, it is more preferably 0.7 mm or less, and further preferably 0.4 mm or less. When the thickness of the punching blade is 0.4 mm or less, although the cut line 16 is formed, due to the characteristics of the paper material after cutting, it is also difficult to form a gap caused by the cut line 16. Therefore, leakage from the cut line 16 can be significantly reduced.

[0085] The mouth portion 12 is an opening formed in such a way that it can function as a drinking mouth. When a user drinks the beverage in the container 101 in the case of a lid 1 of a container filled with a beverage as in the present embodiment, for example, the beverage in the container 101 can flow out of the container 101. In addition, the mouth portion 12 can also function as an insertion port into which an object such as a straw can be inserted into the space portion 105 of the container 101.

[0086] As Figure 1 As shown in etc., the sealing member 21 is mounted on the cover piece 13. A joining portion 22 is formed at one end portion 21a of the sealing member 21. The joining portion 22 is a portion for joining with the cover piece 13 by various methods such as ultrasonic joining, heat sealing, and joining based on an adhesive. As the joining method in the joining portion 22, among the above methods, from the viewpoints of joining ease and joining strength, etc., joining by ultrasonic joining is preferable. The portion on the side of the one end portion 21a of the sealing member 21 relative to which the sealing member 21 is mounted on the cover piece 13 is mounted at a position deviated from the central portion of the cover piece 13, and further mounted at a position away from the central portion of the top cover 2 in the cover piece 13, and further mounted at a position most distant from the central portion of the top cover 2. That is, the sealing member 21 is mounted on the cover piece 13 at a position close to the side of the one end portion 13a. In other words, in the cover piece 13, the sealing member 21 is formed in such a way as to join with one end side of the top cover 2. In particular, the joining portion 22 where the cover piece 13 and the sealing member 21 are joined is preferably formed at the one end portion 13a side of the cover piece 13 away from the hinge portion 14.

[0087] In this way, in the cover piece 13, as long as the sealing member 21 is joined at a position farther away from the hinge portion 14, the distance to the force point with respect to the hinge portion 14 (fulcrum) can be increased. Thereby, when the sealing member 21 or the like is lifted, a force is applied to the cover piece 13 via the sealing member 21, and the joining in the dot-like joining portion 17 or the half-cut portion can be released, making it easier to open and close the cover piece 13.

[0088] The sealing member 21 has one end portion 21a mounted on the cover piece 13 and the other end portion 21b opposite to the one end portion 21a. At the other end portion 21b of the sealing member 21, a holding portion 23 formed in a claw shape by making a cut line on the sealing member 21 is formed. The holding portion 23 is formed at a position close to the other end portion 21b in the sealing member 21 and has a prescribed range. The holding portion 23 is formed in such a manner that: when in the state shown in Figure 1 and Figure 3 , it is in a state where a cut line is formed with respect to the sealing member 21, but when held by the holding and receiving portion 26 formed in the top cover 2, that is, when the holding portion 23 formed in a claw shape in the present embodiment is inserted into the cut line forming the holding and receiving portion 26, it becomes a state of being formed in a claw shape protruding from the surface 2a of the sealing member 21 toward the top cover 2. In the present embodiment, as shown in Figure 1 , the shape of the holding portion 23 is triangular and is formed in a state where the tip becomes pointed, but the shape of the holding portion 23 is not limited to a triangular shape. For example, as shown in Figure 18 and Figure 19 , it can also be held by forming the holding portion 23 in a semicircular shape and inserting the holding portion 23 formed in a semicircular claw shape into the holding and receiving portion 26. In addition, the shape of the holding portion 23 is not limited to these shapes, and it can also be other shapes as long as it is formed in a manner that can be held by the holding and receiving portion 26. In addition, in Figure 2 and Figure 4 etc., the broken line formed when the holding portion 23 of the sealing member 21 is protruded toward the top cover 2 by pinching the pinching portion 24 of the sealing member 21 is indicated by reference numeral 27. In addition, the other end portion 21b can be bonded to the top cover 2 in advance using the adhesive etc. listed above as needed. Thereby, breakage etc. of the sealing member 21 before use can be prevented.

[0089] In addition, the raw material forming the sealing member 21 can be formed by appropriately selecting and using the same raw material as the raw material forming the top cover 2 and the side wall 3, for example, the above-mentioned paper raw material or other than the above-mentioned raw material. In addition, as the raw material that can form the sealing member 21, for example, a wood chip, a film-like member, a metal-made member, etc. can also be used. However, when using these members, it is necessary to be able to form the holding portion 23 and to maintain the state where the holding portion 23 is held in the holding and receiving portion 26. That is to say, the sealing member 21 can be appropriately selected and used with any material as long as it is formed in such a manner that: the user can pull up the cover piece 13 by pinching the pinching portion 24 and operating, and the holding portion 23 is held in the holding and receiving portion 26, and the state where the mouth portion 12 is open can be maintained during the period when the holding portion 23 is held in the held portion.

[0090] Next, the effects of the mouth-forming portion 11 in the lid 1 of the present invention will be described. First, as shown in (a) of Figure 7 , in the lid 1, the user pinches the gripping portion 24 of the sealing member 21 and lifts the other end portion 21b of the sealing member 21. At this time, as described above, when the other end portion 21b is joined to the top lid 2, when the user pinches the other end portion 21b of the sealing member 21, their joining is released by peeling the sealing member 21 from the surface 2a of the top lid 2, so that the gripping portion 24 in the other end portion 21b of the sealing member 21 is pinched and lifted. Next, as shown in (b) of Figure 7 , when the user pulls the sealing member 21 in the B direction while pinching the gripping portion 24, the lid piece 13 joined by the joining portion 22 in the one end portion 21a of the sealing member 21 is lifted in the C direction in the figure with the hinge portion 14 as a reference. At this time, since the sealing member 21 is joined at a position close to the one end portion 13a side of the lid piece 13, when considering the hinge portion 14 as a fulcrum and the joining portion 22 as a force point, the force applied in the B direction by the user via the joining portion 22 easily acts as a force for lifting in the C direction. In addition, at this time, if a folding line 15 is formed at the portion where the hinge portion 14 is formed, the lid piece 13 is more easily lifted in the C direction. And when the user further pulls the sealing member 21 in the B direction, the lid piece 13 continues to rotate in the C direction with the other end portion 13b as a center, so that the mouth portion 12 is formed in an open manner. In addition, at this time, the user can pinch the gripping portion 24 and bend the other end portion 21b of the sealing member 21 so that the holding portion 23 protrudes toward the surface 2a side of the top lid 2, or can bend the other end portion 21b before reaching near the holding receiving portion 26, rather than bending the other end portion 21b when the holding portion 23 is about to be inserted into the holding receiving portion 26 and the holding portion 23 is held. Next, as shown in (a) of Figure 7As shown in (c), the user inserts the holding part 23 into the holding receiving part 26. By inserting the holding part 23 into the holding receiving part 26 in this way, the position of the sealing member 21 and the position where the cover piece 13 is opened are physically fixed. That is, for example, if an adhesive seal is used to maintain the open state of the cover piece 13, especially if the content is a beverage or something hot, there is a high possibility that hot air or the beverage will adhere to the back side of the cover piece 13, and even if sealed, it will often peel off immediately. Therefore, even if an attempt is made to fix the cover piece 13 with an adhesive seal, the adhesive force will gradually weaken over time, and eventually the seal will peel off and the cover piece 13 will return to its original position at the closing opening 12. If such an operation of the cover piece 13 occurs, for example, when the user brings the surface 2a of the top cover 2 close to the face to drink a beverage, there is a concern that it may cause discomfort to the user because the cover piece 13 comes into contact with the user's nose or face. However, since the cover body 1 of the present invention physically fixes the sealing member 21 by holding the holding part 23 using the holding receiving part 26, it is possible to reliably suppress the movement of the cover piece 13 attempting to return to its original position over time, and to continuously maintain the state where the opening 12 is open. Therefore, even when the user wants to pour the content in the space part 105 of the container 101 into the mouth, the cover piece 13 does not come into contact with the face and can be used comfortably.

[0091] In addition, according to the cover body 1 of the present invention, since the user operates the holding part 23 to lift the cover piece 13, it is possible to open the opening 12 or operate the cover piece 13 to close the opening 12 without contacting the back side of the cover piece 13. Therefore, since the user's fingers do not come into contact with, for example, the content attached to the back of the cover piece 13, it is hygienic and can also be operated comfortably when opening the opening 12.

[0092] Moreover, according to the cover body of the present invention, by operating the holding part in the state held by the holding receiving part, the cover piece can also be moved in the direction of closing the opening. Therefore, by operating the holding part, it is also possible to simply perform multiple opening and closing operations of the cover piece. Therefore, even when the content in the container, such as a beverage, is not finished drinking within a short time, the cover piece can be simply closed, and the closed state can also be continuously maintained. In addition, according to the cover body 1 of the present invention, since it is formed using a paper raw material, a cover body that can also consider environmental problems can be provided.

[0093] Figure 11 Examples of the mouth forming part 11 are shown in (a) to (f). In addition, Figure 11The form of (d) is an example of the mouth-forming part 11 of the lid body 1 described previously, and is also described herein. Specifically, the mouth-forming part 11 has the same shape as the lid piece 13, and the mouth 12 also has the same shape when the lid piece 13 is opened. Here, although the shape of the mouth-forming part 11 is described, the shape including the lid piece 13 and the mouth 12 is also described. First, the mouth-forming part 11 is not limited to the shape described previously. For example, as shown in the deformation example described later, it can be any selected shape. For example, Figure 11 The mouth-forming part 11 shown in (a) forms dot-like joint parts 17 at a total of three places, that is, there is one place on the one-end part side that becomes the one-end part 13a side in the mouth-forming part 11, and there is one place on each of the left and right sides midway from the one-end part side to the other-end part side that becomes the other-end part 13b side. In addition, on the other-end part side that becomes the other-end part 13b side, the cut line 16 forming the mouth-forming part 11 is formed in a manner of depicting an arc from the other-end part side toward the one-end part side. In addition, in this deformation example, a stress relief part 18 is formed on the other-end part 13b side of the cut line 16. The stress relief part 18 is formed in an arc shape, and the end part on the other-end part 13b side of the cut line 16 is located above the end part on the other-end part 13b side in the mouth-forming part 11. In addition, the stress relief part 18 is formed in a manner of being located outside the mouth-forming part 11. By forming the stress relief part 18 in this way, when the lid piece 13 is moved to open the mouth 12, etc., breakage of the top cover 2 caused by the force applied to the lid piece 13, etc. can be prevented.

[0094] Figure 11 The mouth-forming part 11 shown in (b) is the same shape as the shape in (a) of the above Figure 11 And, in Figure 11 The mouth-forming part 11 shown in (b), in addition to the cut line 16, a fold line 15 is also formed on the base end part side, and in addition Figure 11(c) shows a configuration in which, in addition to the cut line 16, a fold line 31 is formed on the front end side of the cover sheet 13. The fold line 15 and fold line 31 formed in this manner are used to specify the position at which the other end 13b of the cover sheet 13, which is the mouth-forming portion 11, is folded when the cover sheet 13, which is the mouth-forming portion 11, changes from a flat position (i.e., a position in which the mouth 12 is closed) to an upright position (i.e., a position in which the mouth 12 is opened). By forming the fold line 15 on the base end side of the mouth-forming portion 11 in this manner, it is possible to effectively suppress the uprighting pattern or deviation of the cover sheet 13, which is the mouth-forming portion 11, when it is in an upright position. Furthermore, by forming the fold line 31 on the one end 13a side of the mouth-forming portion 11, it is possible to specify the portion at which the top cover 2, which is formed with the mouth-forming portion 11, is folded. Therefore, when the mouth-forming portion 11 moves from the laid-down state to the erected state, the influence on the end portion on the one end portion 13 a side of the mouth-forming portion 11 can be reduced.

[0095] exist Figure 11 In the mouth forming portion 11 shown in (d), the above Figure 11 The shape of (a) is different in that the width dimension on the side of one end 13a is larger than the width dimension on the side of the other end 13b. By forming the mouth-forming portion 11 in this way, not only can the above-mentioned effect be achieved, but also, for example, when the contents of the container 101 contain solids such as ice, the mouth-forming portion 11 of this example can reliably prevent the solids such as ice from suddenly jumping into the user's mouth when the container 101 is used.

[0096] exist Figure 11 The mouth forming portion 11 shown in (e) has Figure 11 The width dimension is the opposite of the shape in (d). Specifically, the width dimension of the mouth-forming portion 11 on the other end 13b side is larger than the width dimension on the one end 13a side. By forming the mouth-forming portion 11 in this manner, not only can the aforementioned effects be achieved, but also, if the contents of the container 101 contain solids such as ice, the mouth-forming portion 11 of this embodiment can reliably prevent the ice, etc., from suddenly entering the user's mouth when the container 101 is being consumed.

[0097] Figure 11 The mouth-forming portion 11 shown in (f) is formed so that the stress relief portion 18 faces inward. Even if the stress relief portion 18 faces inward, the end of the cut line 16 is located at a different position from the hinge portion 14, thereby preventing damage to the top cover 2 as described above.

[0098] In addition, more preferably, the dot-shaped joint portion 17 is formed at least at the forefront of the end portion on the side of one end portion 13a, that is, the forefront of the one-end side end portion. This can greatly reduce the concern in the following situation: when the normal mouth-forming portion 11 is given the user's force via the sealing member 21, if the dot-shaped joint portion 17 is not formed at the above-mentioned portion, warping will occur at the place where the user's force is applied and the content of the container 101 will leak from the mouth portion 12. In addition, in Figure 7 from (a) to Figure 7 in the form shown in (c), when forming the cover piece 13 as the mouth-forming portion 11, it can be formed by forming a cut line 16, or can be formed by forming a half-cut portion H. In addition, the cover piece 13 as the mouth-forming portion 11 can also be formed by other means than these.

[0099] Figures 12 to 23 The form of the sealing member 21 is shown.

[0100] Figure 12 The example of the sealing member 21 described previously is shown in (a) of Figure 12 The example shown in (b) of Figure 12 is an example in which the sealing member 21 is joined to the cover piece 13 as the mouth-forming portion 11 at the joint portion 22 and further extends to the front end side compared with the joint portion 22. In addition, Figure 12 The example shown in (c) of

[0101] Figure 12 is an example in which the sealing member 21 is formed in a manner that covers the mouth-forming portion 11 and the pinching portion formed at the other end portion is tapered. Thereby, it is possible to further prevent leakage of, for example, the beverage as the content, and it is possible for the user to easily pinch the other end portion 21b and perform the operation easily. And in Figure 12 In (e) of

[0102] And, Figure 13 The illustrated sealing member 21 is an example in which the mouth-forming portion 11 is entirely covered and the joint portion 22 of one end portion 21a of the sealing member 21 is formed at a position protruding from one end portion 13a of the cover piece 13. If the joint portion 22 is formed at such a position, not only can the cover piece 13 and the sealing member 21 be joined, but also the surface 2a of the top cover 2 and the sealing member 21 can be joined. Therefore, in the state before the user operates the sealing member 21 (for example, when the lid body 1 is in an unused state), the airtight state at the mouth-forming portion 11 can be further strengthened. In addition, Figure 13 The same applies to the form shown in (b) of , and the airtight state and airtightness at the mouth-forming portion 11 can still be improved by joining the sealing member 21 to both the cover piece 13 and the top cover 2.

[0103] Figure 14 in (a) of and Figure 14 The forms shown in (b) of are other forms of the sealing member 21. This sealing member 21 is different from the previously exemplified sealing member 21 in the shape of the holding portion 23. That is, in the state shown in (a) of Figure 14 , a concave portion 33 formed in a manner of narrowing in width is formed in the long side 32 of the sealing member 21 in the holding portion 23 of the sealing member 21. Regarding this concave portion, the end portion on the other end portion 21b side is formed as a hooking portion 34. In addition, the sealing member 21 is formed with a fold line 35 that can be bent at a position near the other end portion 21b in the width direction. Regarding the sealing member 21 formed in this way, if the fold line 35 is folded outward as shown in Figure 15 , the two concave portions 33 formed in the long side 32 become the holding portion 23. And, in the state where the cover piece 13 is pulled up to open the mouth portion 12, the concave portion 33 in the holding portion 23 of the sealing member 21 is fitted into the upper end portion of the side wall 3, and the hooking portion 34 is engaged with the outer wall side of the side wall 3 and held. The holding receiving portion 26 at this time is the side wall 3. That is, the holding receiving portion 26 can be formed not only on the top cover 2, but also on the side wall 3, and the side wall 3 itself can also function as the holding receiving portion 26.

[0104] Figure 16 and Figure 17 The forms shown in are other examples of the sealing member 21. This sealing member 21 is formed in a key shape with the holding portion 23 protruding toward the left direction in the drawing. And, the holding receiving portion 26 is formed at a position where the front end portion 23a of the holding portion 23 formed in this key shape can be inserted. The holding portion 23 formed in this way can hold the state where the cover piece 13 is opened and further hold the state where the mouth portion 12 is opened by inserting the front end portion 23a into the holding receiving portion 26.

[0105] ​​Figure 20 and Figure 21 Shown is another example of the sealing member 21. In this example, the holding portion 23 is formed on the top lid 2, and the holding receiving portion 26 is formed on the sealing member 21. When the holding portion 23 and the holding receiving portion 26 are formed in this way, the holding portion 23 in the top lid 2 is made to face upward compared to the surface 2a of the top lid 2 in advance, and then by inserting the holding receiving portion 26 formed in the sealing member 21, the holding portion 23 is held. That is, the state where the lid piece 13 is open and the mouth portion 12 is open is maintained.

[0106] Figure 23 Shown is another example of the holding receiving portion 26. In this example, the aspect that the holding receiving portion 26 is formed at multiple portions of the top lid 2 is different from the previous example. If the holding receiving portion 26 is formed at multiple portions in this way, the position where the holding portion 23 is inserted can be selected. That is, if the holding receiving portion 26 is formed at multiple portions in this way, the opening manner of the lid piece 13 can be adjusted, in other words, the opening condition of the mouth portion 12 can be adjusted. If formed in this way, for example, when a small amount of the content is discharged from the mouth portion 12 in the state of being installed in the container 101, the holding portion 23 is inserted into the holding receiving portion 26a, and when a large amount of the content is discharged from the mouth portion 12, the holding portion 23 is inserted into the holding receiving portion 26b, etc., the amount of the discharged content can be adjusted by the user.

[0107] Figures 24 to 30 Shown are other examples of the top lid 2 and the side wall 3 of the lid body of the present invention. In addition, what is shown here is only an illustration, and of course, top lids 2 and side walls 3 having other structures can also be used. In addition, for ease of explanation, Figures 24 to 27 the description of the sealing member 21 is omitted.

[0108] Figure 24 The shown lid body 1 is in a form where the erected portion 4 of the top lid 2 and the upper end of the side wall 3 are flush. In this case, as Figure 24 (a) shown, it can not only be in a form where the erected portion 4 and the upper end of the side wall 3 are flush, but also as Figure 24 (b) shown, the erected portion 4 can be inserted inside so that the height position of the bent portion that becomes the upper end of the erected portion 4 and the upper end position of the side wall 3 are flush. In addition, as Figure 24 (c) shown, it can also be formed so that the height position of the bent portion of the erected portion 4 and the position of the upper end of the side wall 3 are flush and the folded portion of the erected portion 4 does not reach the top lid 2. Moreover, it can also be as Figure 24 (d), (e) shown, so that the upper end position of the folded portion formed by folding the side wall 3 outward and the upper end position of the erected portion 4 are consistent and flush.

[0109] Figure 25An example is shown in which a curled portion 41 serving as a protruding portion is formed at the upper end of the lid body 1. The shape of the curled portion 41 can be formed into a curled shape as shown in Figure 25 , or can be a shape in which the curled shape is crushed to form a flange shape. The protruding portion here is a concept including a shape that protrudes outward compared to the side wall 3. In Figure 25 (a), an example is shown in which the upright portion 4 and the side wall 3 are formed flush and the curled portion 41 is formed on the side wall 3. In addition, Figure 25 (b) is an example in which the curled portion 41 is formed on the side wall 3 and is the same as Figure 25 (a) in terms of the formation of the curled portion 41 on the side wall 3, but the upright portion 4 is formed lower than the side wall 3. Figure 25 (c) shows an example in which the curled portion 41 is formed on the side wall 3 and the upright portion 4 protrudes higher than the upper end position of the side wall 3. Moreover, Figure 25 (d) shows an example in which the upper end portion of the upright portion 4 is located above the upper end of the side wall 3 and protrudes outward compared to the side wall 3 to form the curled portion 41. The curled portion 41 can also be formed in this way.

[0110] In addition, if the curled portion 41 is formed, not only can the strength of the side wall 3 and the top cover 2 be increased, but also the heat insulation effect can be improved. For example, when drinking hot beverages, etc., due to the formation of the curled portion 41, it is difficult for the lips to feel uncomfortable heat, or the touch of the mouth can be made good.

[0111] Figure 26 What is shown is a form in which the upright portion 4 protrudes upward compared to the side wall 3. For example, in Figure 26 (a), the upright portion 4 protrudes upward compared to the side wall 3. In Figure 26 (b) and Figure 26 (c), the upright portion 4 is formed by folding inward, and the position of the folded end portion protrudes upward compared to the upper end of the side wall 3. In Figure 26 (d) and Figure 26 (e), the side wall 3 is formed by folding outward, and the position of the upper end of the upright portion 4 protrudes upward compared to the position of the folded end portion.

[0112] Figure 27 What is shown is a form in which, contrary to Figure 26 , the upper end of the upright portion 4 is formed at a position lower than the upper end of the side wall 3. In Figure 27 (a), the position of the upper end of the side wall 3 is at a position higher than the upper end of the upright portion 4. In Figure 27 (b) and Figure 27 (c), examples are shown in which the upright portion 4 is formed by folding inward and the upper end position of the side wall 3 is above the upper end position of the folded portion. In addition, in Figure 27 (d) and Figure 27In (e), an example is shown where the side wall 3 is folded outward, and the height position of the folded portion is above the upper end position of the upright portion 4.

[0113] Figure 28 In (a) and Figure 28 In (b), an example is shown where the lid 2 is formed with an inclined portion 51. If the lid 2 is formed with such an inclined portion 51, for example, when returning from a state where the container 101 or the lid 1 attached to the container 101 is tilted after drinking a beverage or the like to a state where the lid 2 becomes horizontal, the beverage remaining on the inner surface of the upright portion 4 is likely to be transferred on the inclined portion 51 and return to the mouth portion 12. By forming the inclined portion 51 in this way, it is difficult for the beverage to remain on the surface 2a of the lid 2 or the like. In addition, when the inclined portion 51 is formed on the lid 2 in this way, the position of the mouth portion 12 can be formed at a position avoiding the inclined portion 51 as shown in Figure 28 (a), or it can be formed in such a way that the mouth portion 12 is formed in a part of the inclined portion 51 as shown in Figure 28 (b). Figure 28 In (c), an example is shown where a guiding portion 52 is formed at the lower end of the lower wall 6 in the lid 1 described above. The guiding portion 52 is a component for facilitating the installation of the lid 1 on the container 101 when installing it on the container 101. By forming this guiding portion 52, the installation can be performed more smoothly with respect to the container 101.

[0114] Figure 29 An example of the form of the engaging portion 7 formed on the lower wall 6 in the lid 1 described above is shown. The Figure 29 In (a), the form of the lid 1 described above is shown, where the engaging portion 7 is formed in a straight line with a tapered tip without bulging outward. In addition, Figure 29 In (b) to (e), the shape of the engaging portion 7 is shown. Based on the shape of being formed in a straight line with a tapered tip as described in Figure 29 (a), instead of forming the upright portion 4, it has a downwardly upright portion 61 that forms the peripheral edge of the lid 2 by standing downward. The lid 1 can also be in such a form.

[0115] Figure 30 An example of the lid 1 formed as follows is shown: It has a downwardly upright portion 61 where the peripheral edge of the lid 2 stands downward, forms a side wall 3 so as to surround the periphery of the downwardly upright portion 61, and the downwardly upright portion 61 and the side wall 3 are joined. Figure 30 In (a), the engaging portion 7 is formed in a straight line with a tapered tip, Figure 30 In (b) of the lid 1, the engaging portion 7 bulges outward.

[0116] As described previously, the cover 1 of the present invention can be applied to such various forms of the cover 1. In addition, it can also be applied to covers 1 in forms other than the above. Above, the cover of the present invention has been described in detail, but the above description is merely an illustration of the cover of the present invention and is not limited to these covers. Therefore, appropriate changes can be made without departing from the gist of the present invention. In addition, the structures of the above covers can use the structures of the covers in each example independently, or can be applied after appropriately combining the structures of the covers in each example.

[0117] Explanation of Reference Numerals

[0118] 1 Cover

[0119] 2 Top Cover

[0120] 3 Side Wall

[0121] 4 Upright Portion

[0122] 5 Upper Wall

[0123] 6 Lower Wall

[0124] 7 Engaging Portion

[0125] 11 Mouth Forming Portion

[0126] 12 Mouth

[0127] 13 Cover Flap

[0128] 21 Sealing Member

[0129] 23 Holding Portion

[0130] 26 Holding and Receiving Portion.

Claims

1. A lid body, comprising a top lid that can be closed with respect to a container, characterized in that: The top lid is formed of a paper raw material and has a mouth forming portion, which has a mouth that communicates the inside and outside of the top lid and a lid piece that is formed to be able to open and close the mouth via a hinge portion. A joint portion for engaging with a sealing member is formed on the lid piece. The sealing member has one end portion where the joint portion is formed, the other end portion relative to the one end portion, and a pinching portion formed on the other end portion. A holding portion for holding the lid piece in a state where the mouth is open is formed on one of the top lid and the sealing member. A holding receiving portion for holding the holding portion in a state where the mouth is open is formed on the other of the top lid and the sealing member.

2. The lid body according to claim 1, characterized in that: The holding portion is formed to protrude toward the holding receiving portion.

3. The lid body according to claim 2, characterized in that: The holding receiving portion is formed in a notch shape, and the holding portion is formed to be insertable.

4. The lid body according to claim 1, characterized in that: The lid body includes a side wall portion formed in an annular shape surrounding the periphery of the top lid and formed of a paper raw material. The holding receiving portion is formed on the side wall portion.

5. The lid body according to claim 4, characterized in that: The sealing member has a concave portion formed on the long side of the sealing member in a manner of narrowing in width. The holding portion is formed in the concave portion.

6. The lid body according to claim 1, characterized in that: The holding portion is formed on the top lid. The holding receiving portion is formed on the sealing member.

7. The lid body according to claim 1, characterized in that: The holding portion is formed on the sealing member. The holding receiving portion is formed on the top lid.

8. The lid body according to claim 1, characterized in that: The hinge portion is formed on the proximal end side. The lid piece is formed with a stress relief portion for reducing stress generated with respect to the force applied when pulling up the lid piece.

9. The lid body according to claim 8, characterized in that: The stress relief portion has a notch for dispersing the stress, and the notch is formed to extend in a direction different from the direction of the force applied to the lid piece at the proximal end side end portion.

10. The lid body according to claim 9, characterized in that: A fold line is formed in the hinge portion.

11. The lid body according to claim 1, characterized in that: The lid piece is joined by forming a dot joint portion or a half-cut portion.

12. The lid body according to claim 1, characterized in that: The lid piece is formed such that the width on the side away from the hinge portion is larger than the width on the side where the hinge portion is formed.

13. The lid body according to claim 1, characterized in that: The lid piece is formed such that the width on the side where the hinge portion is formed is the same as the width on the side away from the hinge portion.

14. The lid body according to claim 1, characterized in that: The mouth forming portion is provided at a position offset from the central portion of the top lid.

15. The lid according to claim 1, wherein the sealing member is installed at a position offset from the central portion of the mouth-forming portion.

16. The lid according to claim 1, wherein the sealing member is installed at a position away from the central portion of the top lid in the mouth-forming portion.

17. The lid according to claim 1, wherein the sealing member is installed at a position that is maximally separated from the central portion of the top lid in the mouth-forming portion.

18. The lid according to claim 1, wherein the sealing member is configured to cover at least a portion of the mouth-forming portion.

19. The lid according to claim 1, wherein the sealing member has a width greater than or equal to the width of the mouth-forming portion.

20. The lid according to claim 1, wherein the sealing member is formed such that one end extends further than one end of the mouth-forming portion.

21. The lid according to claim 18, wherein the sealing member is formed to be sized to cover the entire mouth-forming portion.

22. A combination of a container and a lid, wherein it includes a container having a mouth and the lid according to any one of claims 1 to 21.

23. A container with a lid, wherein it includes a container having a mouth and the lid according to any one of claims 1 to 21, and the mouth of the container is covered by the lid.

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