Cover

Abstract

A lid body is provided that ensures the airtightness of a container and facilitates the discharge of contents from a mouth of the lid body. The lid body comprises a top lid made of a paper material, the top lid comprising: a mouth connecting the inside and outside of the top lid; a cover piece formed to be able to open and close the mouth; and a retaining portion that retains the cover piece when the mouth is open. The lid body comprises a retaining receiving portion that retains the retaining portion when the mouth is open.

Description

[0001] This invention application is a divisional application of the invention application with an international application date of January 12, 2021, an international application number of PCT / JP2021 / 000737, a national application number of 202180005456.5 entering the Chinese national phase, and an invention name of "Cover Body". Technical Field

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

[0003] In convenience stores or supermarkets, various beverages and prepared foods are placed in simple containers and sold. In the past, these stores often displayed products in front of the store, in which the beverages were pre-stored in containers and the mouths of the containers were sealed with lids. However, in recent years, in addition to this form of sales, it has become common for buyers to place various beverages such as coffee in cup-shaped containers in the store, cover them with lids, and take them home. Therefore, in recent years, various lids have been proposed that prevent the contents of the container (e.g., various beverages such as coffee) from spilling out when held by hand compared to the past.

[0004] Traditionally, this type of lid has been widely used as a molded product made of plastic. However, in recent years, due to concerns about various environmental issues caused by plastic products, there has been widespread demand to reduce the amount of plastic used as raw materials for simple containers and lids for food and beverages that are intended to be used and discarded quickly. Consequently, proposals have been made in recent years to use lids made of pulp or paper materials instead of plastic (e.g., Patent Documents 1 and 2).

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Laid-Open No. 2006-248530

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

[0009] However, paper generally has lower elasticity and formability than plastic, making it difficult to form into complex shapes. Consequently, it is difficult to form a lid made of pulp or paper that reliably seals the container's opening, maintains a good seal within the container, and prevents leakage even when the container's contents are liquid, as is the case with lids made of plastic.

[0010] In the past, various efforts have been made in the construction of lids that use paper materials to improve the adhesion to the mouth of a container. In the above-mentioned patent document 1, a lid is disclosed that is composed of a wall portion and a top cover portion and is fitted on the inner side of the mouth of the container, wherein the wall portion has a conical outer surface that engages with the inner surface of the conical main body of the paper container, and the top cover portion is surrounded by the wall portion. In addition, patent document 2 discloses a lid formed of pulp-shaped paper for use as a beverage cup. In addition, the lid disclosed in patent document 2 is formed with a beverage outlet in an open manner for discharging the contents of the container (e.g., beverages such as coffee) to the outside of the container even when the lid is sealed.

[0011] However, regarding the lid disclosed in Patent Document 1, it is difficult to say that the tightness between the container mouth and the wall surface of the lid is sufficient when the lid is sealed, and there is a concern that the liquid in the container will leak out. In the case of a lid or container made of paper, due to the characteristics of the paper material, it is easily affected by humidity and other factors, which may cause dimensional deviations in the lid or container mouth. On the other hand, because the previous paper lid is formed in a structure in which the part that engages with the container mouth overlaps with the side wall and the top cover, or the side wall is reinforced with reinforcing material, the part that engages with the container mouth will become hard and lack elasticity. Therefore, if there is a slight deviation in the size of the lid or container mouth, there is a problem that the container can no longer be reliably sealed and it is difficult to ensure stable sealing.

[0012] Furthermore, as in the lid disclosed in Patent Document 2, when the container's contents are beverages, a beverage outlet is often formed in the lid in an open manner. However, even if the container and lid are sealed tightly, forming a beverage outlet in this manner poses the risk of the contents suddenly spilling out of the beverage outlet when carried. To address this issue, it is conceivable that a structure capable of blocking the beverage outlet even when carried would be sufficient. However, if the beverage outlet is blocked in this manner, the blocked beverage outlet must be opened again the next time the contents are consumed, resulting in other problems such as increased complexity. To address this issue, another option is to press a sealing member (cover sheet) that blocks the beverage outlet into the container to open the beverage outlet. However, opening the beverage outlet by pressing the cover sheet into the container in this manner is hardly hygienic. Furthermore, opening the beverage outlet by pulling the cover sheet outward can also lead to problems such as cumbersome operation of pulling the cover sheet up, or the structure or shape of the lid itself must be complicated to facilitate pulling the cover sheet up.

[0013] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a lid body that can ensure the airtightness of a container and facilitate discharge of the contents from the opening of the lid body.

[0014] The gist of the present invention is:

[0015] (1) A cover body having a top cover made of a paper material, wherein the top cover body is characterized in that the top cover has: an opening connecting the inside and the outside of the top cover; a cover piece formed in a manner capable of opening and closing the opening; and a holding portion for holding the cover piece when the opening is open, and the cover body has a holding receiving portion for holding the holding portion when the opening is open.

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

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

[0018] (4) In the cover body described in (1) above, the holding portion is formed in a claw shape, the holding receiving portion is formed in a notch shape in the top cover, and the holding portion is formed in a manner that can be inserted into the holding receiving portion.

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

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

[0021] Effects of the Invention

[0022] The lid of the present invention includes a top cover made of paper, the top cover comprising: a mouth portion connecting the inside and outside of the top cover; a flap formed to open and close the mouth portion; and a retaining portion that holds the flap when the mouth portion is open. The retaining portion includes a retaining receiving portion that holds the retaining portion while the mouth portion is open. Thus, by operating the retaining portion and pulling up the flap, the mouth portion opens, connecting the inside and outside of the top cover. Furthermore, since the retaining portion is held by the retaining receiving portion, the open mouth portion is maintained. Since the retaining portion is held by the retaining receiving portion, the position of the flap is maintained in a fixed position. For example, when a user tilts a container with the lid attached to pour the contents from the mouth (e.g., when drinking a beverage), the flap does not fall toward the mouth and remains in a fixed position. Therefore, when the container with the lid attached is tilted, the flap does not contact the user's face (e.g., nose), causing no discomfort, allowing the user to comfortably pour out the contents (e.g., drink a beverage).

[0023] Furthermore, the lid of the present invention allows the lid to be lifted by operating the retaining portion, allowing the mouth to be opened without contacting the back side of the lid. This prevents the user's fingers from coming into contact with, for example, contents adhering to the back side of the lid, allowing for comfortable opening of the mouth. Furthermore, since the lid can be lifted simply by operating the retaining portion, the lid can be lifted with a simple operation.

[0024] Furthermore, according to the lid of the present invention, by manipulating the retaining portion while it is held by the retaining receiving portion, the lid flap can also be moved toward the closing portion. Therefore, by manipulating the retaining portion, the lid flap can be easily opened and closed multiple times. This allows the lid flap to be easily closed even when the contents of the container, such as a beverage, are not consumed within a short period of time, and the closed state can be maintained continuously. Furthermore, according to the present invention, a lid can be provided that is also environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is an embodiment of the cover body of the present invention, and is a perspective view showing the appearance of the cover body in a state where the cover piece is closed.

[0026] Figure 2 This is a perspective view showing the appearance of the cover body with the cover piece opened.

[0027] Figure 3 It is a top view showing the cover body in a state where the cover piece is closed.

[0028] Figure 4 It is a top view showing the cover body in a state where the cover piece is opened.

[0029] Figure 5 yes Figure 1 AA line longitudinal sectional view of the cover body.

[0030] Figure 6 It is a partial enlarged cross-sectional view of the cover.

[0031] Figure 7 This is an explanatory diagram for explaining the effects of opening the cover piece of the lid body.

[0032] Figure 8 It is an explanatory diagram showing a state where the cover is attached to the container.

[0033] Figure 9 This is an explanatory diagram for explaining the effects of attaching the cover to the container.

[0034] Figure 10 It is an explanatory diagram showing a state where the covers are stacked.

[0035] Figure 11It is an explanatory diagram for explaining another embodiment of the drinking port forming portion.

[0036] Figure 12 This is an explanatory diagram for explaining another embodiment of the sealing member connected to the cover sheet.

[0037] Figure 13 This is an explanatory diagram for explaining another embodiment of the sealing member connected to the cover sheet.

[0038] Figure 14 These are explanatory diagrams and perspective views showing still another embodiment of the sealing member.

[0039] Figure 15 Is to use Figure 14 The sealing member is shown in a perspective view with the cover opened.

[0040] Figure 16 It is a plan view showing still another embodiment of the sealing member.

[0041] Figure 17 Is to use Figure 16 The diagram shows a top view of the sealing member with the cover flap opened.

[0042] Figure 18 It is a plan view showing still another embodiment of the sealing member.

[0043] Figure 19 Is to use Figure 18 The diagram shows a top view of the sealing member with the cover flap opened.

[0044] Figure 20 It is a plan view showing still another embodiment of the sealing member.

[0045] Figure 21 Is to use Figure 20 The diagram shows a top view of the sealing member with the cover flap opened.

[0046] Figure 22 Is used to illustrate the use of Figure 20 and Figure 21 1 is an explanatory diagram of the effect of the sealing member when the cover is opened.

[0047] Figure 23 This is a perspective view showing the appearance of another type of cover having a holding receiving portion.

[0048] Figure 24 It is a longitudinal sectional view showing another embodiment of the cross-sectional structure of the cover.

[0049] Figure 25 It is a longitudinal sectional view showing another embodiment of the cross-sectional structure of the cover.

[0050] Figure 26 It is a longitudinal sectional view showing another embodiment of the cross-sectional structure of the cover.

[0051] Figure 27 It is a longitudinal sectional view showing another embodiment of the cross-sectional structure of the cover.

[0052] Figure 28 It is a longitudinal sectional view showing another embodiment of the cross-sectional structure of the cover.

[0053] Figure 29 It is a longitudinal sectional view showing another embodiment of the cross-sectional structure of the cover.

[0054] Figure 30 It is a longitudinal sectional view showing another embodiment of the cross-sectional structure of the cover. DETAILED DESCRIPTION

[0055] Hereinafter, the cover of the present invention will be described in detail based on the accompanying drawings. In addition, regarding the cover of the present invention, an example of a cover used for a container (cup) for various beverages such as a coffee cup is cited for description, but it is not limited to the cover of a container for beverages, and it can also be applied as a cover 1 for a container for storing food other than beverages. In addition, the cover of the present invention can also be applied as a cover for a container for storing various items other than food and beverages, such as parts such as bolts or nuts, and items other than the above. In addition, as the cover of the present invention, an example of a cover having a circular shape when viewed from above is used for description, but the shape of the cover 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] like Figures 1 to 6 As shown, the cover body 1 is composed of a top cover 2 and a side wall 3 formed in a circular shape surrounding the top cover. The side wall 3 is formed into a cylindrical shape by joining the two ends of the paper material in a circular shape. Furthermore, the side wall 3 is formed to taper from the upper end to the lower end. The term "tapered" here means that the outer wall of the side wall 3 is formed to taper as a whole from the upper end to the lower end. This "tapered" shape includes not only shapes in which the outer wall of the side wall 3 gradually decreases in size from the upper end to the lower end, but also shapes in which the outer wall of the side wall 3 as a whole tapers even if a portion of the outer wall of the side wall 3 has a bulge or protrusion, or such bulge or protrusion is formed. Furthermore, even if a portion of the side wall 3 is a straight cylindrical shape without a taper, the outer wall of the side wall 3 as a whole tapers. That is, the term "tapered" herein encompasses a configuration in which a portion of the side wall 3 has a shape different from the tapered shape, as long as the outer wall of the side wall 3 as a whole is tapered.

[0057] The top cover 2 is bent at the periphery to form a rising 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 rising portion 4 of the top cover 2 to the inner surface side of the upper wall 5 of the side wall 3. Figure 8 As shown, an annular groove-shaped engaging portion 7 is formed on the lower wall 6 of the side wall 3, and the engaging portion 7 is formed in a shape that engages with the curled portion 103 of the container mouth 102 formed on the container 101. The engaging portion 7 is not limited to being formed in an annular groove shape, 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 circumferential surface of the lower wall 6 of the side wall 3 is pressed and pressed to form the annular groove-shaped engaging portion 7, the step difference of the joining portion formed on the lower wall 6 of the side wall 3 by joining the two end portions of the rectangular or fan-shaped paper material can be reduced, and a gap is less likely to be formed between the lid body 1 and the container 101, thereby improving the airtightness based on the lid body 1 when sealing. In addition, Figures 1 to 6 In the example shown, although the outer side surface of the annular groove-shaped engaging portion 7 (the outer side surface of the lower wall 6) formed by extrusion pressing or the like is formed in a bulging manner, it is also possible to form a case where an annular groove-shaped engaging portion 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 step difference at the joining portion of the side wall 3, before joining the two ends of the rectangular or fan-shaped paper material used to form the side wall 3, the two ends may be compressed in a manner that gradually becomes thinner toward the end edge (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 convenience of explanation, in Figures 8 to 10 In the embodiment, description of the sealing member described later is omitted.

[0058] In the lid body 1 of this embodiment, the side wall 3 is formed in a manner such that the two ends of the fan shape are joined together, the arc length of the upper end side being longer than the arc length of the lower end side. Therefore, the side wall 3 is formed so that the side surface is formed as a whole into a pointed shape from the upper end side toward the lower end side (toward the container mouth 102 of the container 101) (toward the container mouth 102). Figure 8 The direction of arrow a is inclined as a whole), and the inner dimension of the lower end side of the engaging portion 7 is smaller than the inner dimension of the upper end side of the engaging portion 7.

[0059] Regarding the cover 1 of this embodiment, since the side wall 3 is formed into a tapered and inclined shape, Figure 10The stacking property is excellent when a plurality of cover bodies 1 are stacked as shown. That is, the cover body 1 of this embodiment can be stored and transported in a smaller space by stacking a plurality of cover bodies 1 up and down, thereby achieving cost reduction during storage and transportation. The side wall 3 is not limited to the case where the side surface is formed in an inclined shape as a whole, and only a part of the side wall 3, such as the upper end side or the lower end side of the side wall 3, can be formed in an inclined shape. In addition, the upper end side and the lower end side of the side wall 3 can also be formed with different inclination angles. Moreover, the cover body 1 of this embodiment can also be formed into a non-inclined cylindrical shape by forming the side wall 3 into a surrounding shape with a rectangular paper raw material. Moreover, by forming it with a paper raw material in the shape of an inverted fan, it can also be formed into a shape similar to the side wall 3. Figure 10 The opposite of the inclined shape shown in the figure, but the side wall 3 is preferably set to a non-inclined shape, or as shown in the figure Figure 10 As shown, the side wall 104 of the container 101 is inclined in a tapered shape toward the container mouth 102 of the container 101 in accordance with the inclination angle of the side wall 104. Furthermore, by forming the side wall 3 into a cylindrical shape with the side surface inclined in a tapered shape from the upper end to the lower end, the stackability of the lid 1 is improved, and the sealing and airtightness of the lid 1 relative to the container 101 are further improved.

[0060] The joining of the two ends of the paper member forming the cylindrical side wall 3 in the cover body 1 and the joining of the top cover 2 and the side wall 3 can be integrated by conventionally known joining methods. Examples of joining methods include conventional adhesives, hot melt adhesives, two-liquid adhesives, heat sealing, ultrasonic bonding, and high-frequency bonding. From the perspective of manufacturing efficiency, it is preferred that the joining surfaces of the top cover 2 and the side wall 3 be formed of a heat-sealable raw material and joined by heat sealing.

[0061] Figure 8 The lid 1 is shown covering the container 101 to seal the container mouth 102 of the container 101. Figure 9 The lid 1 is shown halfway covering the container 101. The lid 1 of this embodiment is formed so that the engagement portion 7 engages with the curled portion 103 of the container 101. The engagement portion 7 is formed in a circumferential groove on the inner wall side of the lower wall 6.

[0062] The lid 1 of this embodiment is structured so that when the engagement portion 7 is engaged with the curled portion 103 of the container 101, the lower end 8 of the lower wall 6 does not contact the side wall 104 of the container 101. This lid 1 of the present invention not only seals the container 101 with high airtightness, but also, due to the elasticity of the lower wall 6, can be easily removed from the container 101. Furthermore, since the lid 1 is structured so that the lower end 8 of the lower wall 6 does not contact the side wall 104 of the container 101 when attached to the container 101, when removing the lid 1 from the container 101, simply placing a finger or the like on the lower end 8 of the lower wall 6 and pulling up the lower wall 6 disengages the engagement between the curled portion 103 of the container mouth 102 of the container 101 and the engagement portion 7 of the lid 1. Furthermore, by further pulling the lid 1 upward, the lid 1 can be removed from the container 101 even more easily.

[0063] The lid 1 of the present invention has a structure in which an engaging portion 7 is formed on the lower wall 6 of the side wall 3 formed in a circular shape from a paper material, and engages with the container mouth 102 of the container 101. Furthermore, the lower wall 6 of the side wall 3 provided with the engaging portion 7 has superior elasticity compared to a case where the lower wall 6 of the side wall 3 is folded over to engage 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 still reliably engage with the container 101. In addition, by designing the diameter of the snap-fit portion 7 to be smaller than the outer diameter of the curled portion 103 of the container 101, even if the pressure in the space portion 105 formed in the container 101 becomes high due to the storage of liquid products such as coffee, especially hot liquid products, there is no hidden danger that the lid 1 will easily fall off. The container 101 can be sealed while maintaining a high degree of airtightness, and can be sealed with a high degree of airtightness in complement with the side wall 3 being formed as a whole from the upper end side to the lower end side in a tapered and inclined shape.

[0064] In addition, the lid body 1 of the present invention can reliably seal the container mouth 102 of the container 101 and maintain high airtightness even if there is an error in the size of the container mouth 102 of the container 101 because the lower wall 6 of the side wall 3 is elastic. In addition, since the side wall 3 is inclined from the upper end side to the lower end side in a pointed tapered shape, and the rising portion 4 formed by rising in an expanded inclined shape is joined to the inner surface 5a of the upper wall 5 of the side wall 3 to integrate the top cover 2 and the side wall 3, the joining strength between the rising portion 4 of the top cover 2 and the inner surface of the upper wall 5 of the side wall 3 is improved. In particular, with respect to Figure 1The lid body 1 shown in the figures has a folded portion 9 formed by folding the upper wall 5 of the side wall 3 toward the inner surface 4a of the rising portion 4, and the inner surface 4a of the rising portion 4 and the opposing surface 9a of the folded portion 9, which is opposite to the inner surface 4a, are joined. Therefore, the bonding strength between the top lid 2 and the side wall 3 is further improved. Therefore, even when a load is applied to the lid body 1, the lid body 1 is unlikely to be twisted, and there is no risk of the engagement portion 7 and the curled portion 103 of the container 101 being disengaged. Even when the internal pressure of the sealed container 101 increases when storing hot drinks, the risk of the lid body 1 falling off the container 101 is extremely low.

[0065] Typically, the larger the lid 1 with its top cover 2, the more likely it is to bend due to the load applied to the lid 1. However, by configuring the lid 1 of the present invention such that the side wall 3 is tapered from the upper end toward the lower end, and by connecting a rising portion 4 formed in a widening, inclined manner to the inner surface of the upper wall 5 of the side wall 3, and further connecting the rising portion 4 to the folded portion 9, the risk of the lid 1 falling off the container 101 due to the load applied to the lid 1 is reduced, even in the case of large lids. The lid 1 of the present invention maintains a secure closed state by configuring the distance between the lower joint 10 of the joint between the rising portion 4 of the top cover 2 and the upper wall 5 of the side wall 3 (the diameter of the lower joint 10 in the case of a circular lid 2) to be larger than the distance between the lower end 8 of the engaging portion 7 (the inner diameter of the lower end of the engaging portion 7 in the case of a circular lid 2). The lid body 1 of this embodiment is formed with a joint portion between the upper wall 5 of the side wall 3 and the upright portion 4 of the top cover 2 as a protruding wall on the upper side of the top cover 2. When the content of the container 101 is a beverage such as coffee, the protruding wall can be used as a mouth contact portion when drinking the beverage, and can also be used as an anti-overflow wall for the beverage.

[0066] Container 101 is not limited to containers with inclined sidewalls 104, such as coffee cups or cup noodle containers; it may also be a cylindrical container, such as a nut jar. The lid 1 of the present invention can be used in various containers, including paper containers, plastic containers, foam plastic containers, and metal cans. It is not limited to containers for storing liquids; it can also be used as a lid for containers for storing dry foods and non-food items. In addition to containers such as coffee cups, cup noodles, and nut jars, the lid 1 of the present invention can also be used as a lid for containers for soup, yogurt, ice cream, various prepared foods, and bento boxes. However, the lid 1 is not limited to containers for food and beverages; it can be used as a lid for all containers.

[0067] Regarding the lid 1 of this embodiment, in which the sidewall 3 is tapered from the upper end to the lower end, the inclination angle α of the sidewall 3 of the lid 1 and the inclination angle β of the sidewall 104 of the container 101 can be the same or different. In different cases, the inclination angle α of the sidewall 3 can be larger or smaller than the inclination angle β of the sidewall 104 of the container 101. When the inclination angle α is smaller than the inclination angle β (in the case of a larger inclination), the fitting force of the lid 1 into the container 101 is increased, further improving the sealing performance. To improve the sealing performance of the lid 1, the inclination angle α of the sidewall 3 of the lid 1 relative to the inclination angle β of the sidewall 104 of the container 101 can be arbitrarily varied depending on the size of the container 101 (the size of the lid 1), etc. Furthermore, in the case of non-circular containers such as polygonal containers, by varying the inclination angle α of the sidewall 3 of the lid 1 according to the shape of the container portion into which the lid 1 is inserted, it is possible to prevent variations in sealing performance due to differences in container portion.

[0068] The cover body 1 of the above embodiment is formed in a manner that the upper wall 5 of the side wall 3 and the rising portion 4 of the top cover 2 are the same height, but is not limited to the situation where the upper wall 5 of the side wall 3 and the rising portion 4 of the top cover 2 are formed in a manner that is equal in height. It is also possible that one of the upper wall 5 of the side wall 3 and the rising portion 4 of the top cover 2 is formed shorter than the other.

[0069] Examples of the paper material constituting the side wall 3 of the lid 1 of the present invention include paper made by applying a slurry of fiber raw material onto a mesh, drying or press-drying it, and then forming it into a sheet; air-laid sheets made by agglomerating fiber raw materials such as pulverized pulp obtained by pulverizing raw material sheets composed of pulp fibers or the like using an airflow, and then affixing the fibers of the accumulated material with an adhesive; and paper made by bonding plant fibers or other fibers. Examples include chemical fiber paper, synthetic paper, waterproof paper, coated paper, alternative paper, parchment paper, wool paper, glass fiber paper, stone paper, ceramic paper, and stacked sheets of these. The paper material may be composed not only of pulp but also of non-pulp natural fibers, synthetic fibers, regenerated fibers, and the like. Preferably, the paper material contains 50% or more pulp, more preferably 70% or more pulp, still more preferably 80% or more pulp, and most preferably 100% pulp. Paper materials can be made of synthetic or natural resin films, nonwoven fabrics, wood-based materials such as wood foil, and composite materials with materials such as aluminum foil. However, in the case of composite materials, the composite material preferably contains 50% by mass or more of pulp, and particularly preferably 80% by mass or more of pulp. A higher pulp content is preferred because the paper material is more biodegradable.

[0070] Examples of the pulp include wood pulp, non-wood pulp, waste paper pulp, and synthetic pulp. More specifically, pulps used after appropriately selecting one or more from the following can be cited: mechanical pulps (MP) such as groundwood pulp (GP), stone groundwood pulp (SGP), chip groundwood pulp (RGP), pressurized groundwood pulp (PGW), thermomechanical pulp (TMP), chemithermomechanical pulp (CTMP), and bleached chemithermomechanical pulp (BCTMP); chemimechanical pulp (CGP); semi-chemical pulp (SCP); bleached sulfate hardwood pulp (LBKP), bleached sulfate softwood pulp (NBKP) and other sulfate pulps (KP); alkaline pulp (AP), sulfite pulp (SP), dissolving pulp (DP) and other chemical pulps; synthetic pulps made from nylon, rayon, polyester, polyvinyl alcohol (PVA), etc.; bagasse pulp (TP); rag pulp made from cotton, flax, hemp, jute, abaca, ramie, etc.; stalk pulps such as straw pulp, esparto pulp, bagasse pulp, bamboo pulp, and kenaf pulp; and auxiliary pulps such as bast pulp. Pulp that can be used includes softwood pulp such as red pine, Sakhalin fir, Picea abies, Douglas fir, hemlock, and spruce; hardwood pulp such as beech, elm, birch, eucalyptus, poplar, and alder; wood pulp such as a mixture of softwood and hardwood pulps; non-wood pulp such as kenaf, bagasse pulp, bamboo pulp, grain pulp, straw pulp, abaca pulp, and cotton pulp; and waste paper pulp. Because softwood pulp has longer fibers than hardwood pulp, paper materials using pulp with longer fibers such as softwood pulp have a higher degree of entanglement between fibers. Furthermore, pulverized pulp obtained by pulverizing raw material sheets using softwood pulp also has longer fibers than pulverized pulp obtained by pulverizing raw material sheets made of hardwood pulp. Therefore, the strength of the paper stock is improved by the entanglement between fibers.

[0071] The paper stock is preferably water-resistant. Pre-water-resistant paper, such as water-resistant paper, may be used, or a paper stock having a coating applied to at least the container-facing surface may be used. The coating may be provided by laminating a film or applying a coating agent.

[0072] As the resin forming the coating layer, for example, polystyrene, polyethylene, polypropylene, polyethylene terephthalate, polyurethane, polyvinyl chloride, polyvinylidene chloride, polyvinyl acetate, cyanoacrylate, epoxy resin, polyacrylic resin, polymethacrylic resin, nylon, polycarbonate; starch resins such as polycaprolactone, polyhydroxyalkanoate, polyhydroxybutyrate, polylactic acid, esterified starch, cellulose acetate, polyvinyl succinate, polyvinyl alcohol, polyglycolic acid, chitosan / cellulose / starch, poly(hydroxybutyrate / hydroxycaproate), poly(caprolactone / butylene succinate), polybutylene succinate, poly(butylene succinate / adipate), poly(butylene succinate / carbonate), Naturally degradable resins such as poly(ethylene terephthalate / succinate), poly(butylene adipate / butylene terephthalate), and poly(tetramethylene adipate / butylene terephthalate) or mixtures thereof; naturally degradable biomass resins or mixtures thereof; fluororesins, silicone resins, UV-curable resins, ethylene-vinyl acetate copolymers, ethylene-vinyl alcohol copolymers, ethylene-propylene copolymers, ethylene-propylene-butadiene copolymers, acrylic acid-styrene copolymers, styrene-butadiene copolymers, acrylonitrile-butadiene-styrene copolymers, copolymers of monomers constituting the above resins, natural resins, paraffin wax, gelatin, cellophane, and polymethylpentene. The coating layer is preferably made of naturally degradable resins such as polylactic acid, polycaprolactone, polyhydroxyalkanoate, and starch resins, naturally degradable biomass resins, or naturally degradable resins such as natural resins, or is formed from these.

[0073] Examples of biodegradable resins include natural resins, biodegradable plastics, and biomass plastics. Examples of biodegradable plastics and biomass plastics include starch-based resins such as polycaprolactone, polyhydroxyalkanoate, polyhydroxybutyrate, polylactic acid, esterified starch, cellulose acetate, polyvinyl succinate, polyvinyl alcohol, polyglycolic acid, chitosan / cellulose / starch, poly(hydroxybutyrate / hydroxycaproate), poly(caprolactone / butylene succinate), polybutylene succinate, poly(butylene succinate / adipate), poly(butylene succinate / carbonate), poly(ethylene terephthalate / succinate), poly(butylene adipate / butylene terephthalate), and poly(tetramethylene adipate / butylene terephthalate), and biodegradable resin mixtures.

[0074] In addition, the biodegradable resin may also contain lubricants such as stearamide, fatty acid esters, fatty acid metal salts, fatty acids, oils and fats, and glycerol fatty acid esters; stabilizers such as triphenyl phosphate, phthalic anhydride, tributyl phthalate, and acetic anhydride; inorganic materials such as titanium dioxide, kaolin, mica, bentonite, diatomaceous earth, magnesium oxide, silica sand aluminum, calcium carbonate, calcium hydroxide, and shell powder; surfactants such as higher fatty acid amides, nonionic surfactants, and glycerol fatty acid esters; foaming agents such as citric acid, sodium bicarbonate, and butane; and other materials such as antistatic agents and hot-melt adhesives, as well as other additives listed on the Japan Bioplastics Association's positive list.

[0075] Furthermore, "natural degradation" refers to the property of being degraded in air, soil, or water by microorganisms, ultraviolet rays, climate change, and the like, thereby reducing environmental impact. Furthermore, the lid of the present invention is not limited by the contents of the container to which it is attached and can be applied to lids that seal containers of all types.

[0076] The top cover 2 of the lid body 1 of the present invention can be made of the same paper material as the side walls 3, but can also be made of a film or sheet material in addition to paper. If the top cover 2 is made of a film or sheet material, the lid body 1 is more easily inserted into the container 101 due to its greater flexibility compared to a case where the top cover 2 is made of a paper material. Furthermore, if the top cover 2 is made of a transparent film or sheet material, the contents of the container 101 can be easily visually confirmed when the lid body 1 is installed in the container 101. As film or sheet, for example, olefin resins such as polyvinyl chloride, polyvinylidene chloride, polyurethane, polyethylene terephthalate (PET), polyethylene or polypropylene, polyvinyl alcohol, acrylic resins, i.e., 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 and their complexes etc. can be used, but preferably polyvinyl acetate, polylactic acid, polycaprolactone, polyhydroxyalkanoate, starch resin etc. have biodegradable materials. In addition, a material obtained by forming an aluminum layer on paper etc. by vapor deposition etc. or a laminated body having an aluminum layer further provided on the surface of paper etc. and a laminated body having polyethylene, polypropylene etc. or a coating on one or both sides thereof can also be used. When the top cover 2 is made of a film or sheet, heat-sealing can be easily performed by coating the surface to be joined to the side wall 3 with polyethylene or polypropylene (OPP, CPP, etc.) when using a material that is difficult to heat-seal, such as PET.

[0077] Whether the cover 1 of the present invention is made of a paper material or a film or sheet, when the side of the cover 2 that contacts the mouth of the container 101 is made of a heat-sealable material, the cover 2 can be heat-sealed to the mouth of the container 101 (at the bottom). Figure 3 In the illustrated embodiment, the lid 1 is joined to the curled portion 103 of the container 101. During use, the lid 1 can be removed from the container 101 while unsealing it. This allows the contents of the container 101 to be shielded from the outside air before use. When the lid 2 is made of a film or sheet, it is preferred to use a material that is resistant to air and moisture permeation, as this improves the barrier properties against the outside air.

[0078] When the container 101 is sealed with the cover 1 of the present invention, first, Figure 14 As shown in (a), the engaging portion 7 of one end side of the cover 1 is embedded in the curled portion 103 of the container 101, and then, as shown in Figure 14 As shown in (b), the snap-fitting portion 7 is sequentially inserted into the curled portion 103 toward the opposite side of the lid 1, so that the top cover 2 is tilted, and the snap-fitting 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 and sealed. 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 if the inner dimension of the lower end 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 container mouth (curled portion 103) and the inner surface of the lower wall of the lid 1 and the lower surface side of the top cover are in close contact, so that the container 101 can be reliably sealed with high airtightness. The lid 1 of the present invention is not limited to containers with a curled portion, and can be inserted into the container mouth to maintain high airtightness.

[0079] Next, the structure of the mouth forming portion 11 and the like in the top cover 2 will be described. Figure 1 As shown in FIG. 1 , the mouth forming portion 11 includes a mouth 12 and a cover 13 to form a Figure 1 and Figure 3 As shown in FIG, the cover 13 closes the mouth 12, and the Figure 2 and Figure 4 As shown, the cover 13 is opened and the mouth 12 is opened. The mouth 12 constituting the mouth forming portion 11 is formed in a manner that connects the inside and outside of the top cover 2 and penetrates between the surface 2a and the back surface 2b of the top cover 2. The mouth 12 is used to form an inlet and outlet of the contents (such as beverages or food, etc.) in the space 105 of the container 101 in an open manner when the cover body 1 is installed in the container 101. Figure 1As shown in the figures, the mouth-forming portion 11 is provided in the top cover 2 at a position offset from the center of the top cover 2 to a predetermined position in the outward direction. Furthermore, the cover piece 13 formed on the top cover 2 is formed so that one end 13a, located a predetermined distance outward from the center of the top cover 2, becomes a free end, and the other end 13b, located closer to the center than the one end 13a, becomes a fixed end. A hinge portion 14 is formed at the other end 13b, and the cover piece 13 is formed so that it can be opened and closed via the hinge portion 14. In other words, the mouth-forming portion 11 is configured so that the one end 13a opens or closes relative to the top cover 2 using the hinge portion 14 at the other end 13b of the cover piece 13 as a fulcrum. Furthermore, the mouth-forming portion 11 forms the mouth 12 in an open manner when the cover piece 13 is opened. Furthermore, it is preferred that a fold line 15 be formed on the hinge portion 14 when the cover piece 13 is opened and closed. Alternatively, the fold line 15 can be formed on the front surface 2a and / or back surface 2b of the top cover 2. By forming the fold line 15 on the hinge portion 14, the cover 13 can be easily opened and closed based on the fold line 15. Furthermore, since the other end 13b of the cover 13 is bent at the location where the fold line 15 is formed, the cover 13 can be easily and neatly bent when folded at the hinge portion 14, i.e., when opened. In other words, by forming the fold line 15, it is possible to prevent the cover 13 from bending at locations other than the location where the fold line 15 is formed, where it becomes a fulcrum. Furthermore, the fold line 15 can be extruded into a linear shape, for example, by stamping. Specifically, the fold line 15 can be formed by linearly stamping the designated location where the fold line 15 is formed using a stamping machine or the like. Since the cover 13 is only bent at the specific location where the fold line 15 is formed, positional deviations in the folding of the cover 13 can be significantly reduced. In addition, regarding the formation of the folding line 15 , any conventionally known method can be appropriately selected and used.

[0080] The mouth-forming portion 11 is formed so that when the lid 13 is opened with the lid body 1 attached to the container 101, the space 105 of the container 101 can be visually confirmed through the mouth 12. Furthermore, it is desirable that the portion where the mouth 12 is formed is formed so that one end portion 12a of the mouth 12 (the end portion on the same side as one end portion of the lid 13) is located outside the inner side wall 106 of the container 101 when the lid body 1 is attached to the container 101.

[0081] like Figure 1 and Figure 2As shown, the mouth-forming portion 11 has a fold line 15 formed in the portion where the hinge portion 14 is formed, and a cut line 16 is formed in the portion other than the portion where the hinge portion 14 is formed, and is joined to the top cover 2 via a dot-shaped joint 17 formed between the dot-shaped joint 16. By forming the mouth-forming portion 11 in this manner, the lid 13 can be maintained in a closed state by the presence of the dot-shaped joint 17 in the state before use, and when the lid 13 is pulled or pulled up by the sealing member 21 described later, the dot-shaped joint 17 is severed, thereby releasing the joint at the dot-shaped joint 17.

[0082] In addition, the mouth forming portion 11 may be formed as a half-cut portion in which a line that can be cut along the shape of the cover sheet 13 as a whole (in other words, along the shape of the mouth 12 as a whole) is formed, in addition to being formed by the cut line 16 and the dot-shaped joint 17 as described above. Figure 18 ), the aforementioned cut lines 16 and dotted joints 17 are no longer present, and instead a cut is formed along the entire shape of the cover sheet 13 (or the mouth 12). The depth of the cut in this half-cut portion is thinner than the overall wall thickness of the top cover 2, and it is not formed in such a way as to penetrate between the front surface 2a and the back surface 2b of the top cover 2 as the cut lines 16 do. Furthermore, when using these cut lines 16, dotted joints 17, and half-cut portions H, in addition to forming the half-cut portion H in place of the cut lines 16 and dotted joints 17, the cut lines 16, dotted joints 17, and half-cut portions H can also be used separately.

[0083] like Figure 1 As shown in FIG. 1 , in the cover 13, a stress relief portion 18 is formed at the other end portion 13b where the hinge portion 14 is formed, for relieving the stress generated by the force applied when the cover 13 is pulled up. The stress relief portion 18 is formed so that Figure 1In the example shown in FIG. 1 , the distance between adjacent cutout lines 16 in the area where the hinge portion 14 is formed is curved in a direction away from the direction in which the cover plate 13 is formed. The stress relief portion 18 is formed so that the end of the other end side of the cutout line 16 is offset from the radial position where the hinge portion 14 is formed, that is, positioned radially outward relative to the radial position. By positioning the end of the other end side of the cutout line 16 in the stress relief portion 18 in this position, the stress applied to the area adjacent to the hinge portion 14 can be reduced. Furthermore, to reduce the stress generated at this location, the other end side of the cutout line 16 need not be formed in the same area as the area where the hinge portion 14 is formed; instead, the other end side of the cutout line 16 may be formed in a different area from the area where the hinge portion 14 is formed. By forming the stress relief portion 18 in this manner, the stress applied to the other end of the cut line 16 can be reduced when the cover 13 is opened, thereby preventing the top cover 2 from being cracked or damaged when the cover 13 is opened.

[0084] In addition, if Figure 6 As shown in (a), the incision line 16 can be formed by cutting vertically from the surface 2a and the back surface 2b of the top cover 2, or as shown in Figure 6 As shown in (b) of FIG. 2 , the top cover 2 is cut into the back cover 2 at a predetermined angle from the front cover 2a toward the back cover 2b. Figure 6 When a cutout is formed vertically from the surface 2a of the top cover 2 toward the back 2b as shown in (a), the cover 13 can be opened relatively easily along the cutout line 16. Figure 6 When the cut line 16 is formed by cutting as shown in (b), the cut surface formed in the shape of an inclined plane on the top cover 2 side and the cut surface formed in the shape of an inclined plane on the cover piece 13 side abut against each other. Therefore, even when trying to pull up the cover piece 13, or when the container 101 is sealed with the cover body 1, the cut surface on the cover piece 13 side and the cut surface on the top cover 2 side are pushed toward the surface 2a side due to changes in the vapor pressure in the space portion 105, etc., and the cut surface on the cover piece 13 side and the cut surface on the top cover 2 side will abut against each other, making it difficult to open the cover piece 13. Therefore, if the cover piece is formed like this, it is possible to more effectively prevent the cover piece 13 from opening suddenly. In addition, in the case of Figure 6 When the top cover 2 and the cover sheet 13 form inclined cutout surfaces, as shown in (b), the cutout surface on the top cover 2 side is preferably formed such that the end of the cutout surface on the front side is closer to the center than the end of the cutout surface on the back side 2b. Furthermore, the cutout surface on the cover sheet 13 side is preferably formed such that the end of the cutout surface on the back side 2b is closer to the radially outer side than the end of the cutout on the front side 2a.

[0085] The mouth-forming portion 11 can be formed by any method known as punching or a conventionally known method equivalent to punching. In addition, in order to form the mouth-forming portion 11 by the above-mentioned punching, the thickness of the punching blade used in the punching process is preferably 1.0 mm or less. More specifically, it is more preferably 0.7 mm or less, and even more 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 difficult to form a gap caused by the cut line 16. Therefore, leakage from the cut line 16 can be greatly reduced.

[0086] The mouth 12 is an opening formed so as to function as a drinking opening. For example, in the case of the lid 1 of a container containing a beverage as in the present embodiment, when a user drinks the beverage in the container 101, the drinking opening allows the beverage in the container 101 to flow out of the container 101. Alternatively, the mouth 12 may function as an insertion opening for inserting an object such as a straw into the space 105 of the container 101.

[0087] like Figure 1 As shown in the figures, a sealing component 21 is installed on the cover sheet 13. A joint 22 is formed at one end 21a of the sealing component 21. The joint 22 is a portion for joining to the cover sheet 13 using various methods such as ultrasonic bonding, heat sealing, and bonding based on adhesives. As a joining method in the joint 22, in the above-mentioned methods, ultrasonic bonding is preferably used from the perspectives of ease of joining and bonding strength. The portion on the side of the one end 21a of the sealing component 21 installed relative to the cover sheet 13 is installed at a position deviated from the central part of the cover sheet 13, further installed at a position away from the central part of the top cover 2 in the cover sheet 13, and further installed at a position away from the central part of the top cover 2 to the greatest extent. That is, the sealing component 21 is installed in the cover sheet 13 at a position close to the one end 13a side. In other words, the sealing component 21 is formed in the cover sheet 13 in a manner that is joined to one end side of the top cover 2. In particular, the joint portion 22 where the cover piece 13 and the sealing member 21 are joined is preferably formed on the side of the one end portion 13 a spaced apart from the hinge portion 14 in the cover piece 13 .

[0088] In this way, if the sealing member 21 is joined to the cover 13 at a position farther from the hinge 14, the distance to the force point relative to the hinge 14 (the fulcrum) can be increased. Thus, when the sealing member 21 is lifted, a force is applied to the cover 13 via the sealing member 21, releasing the joints at the point-shaped joints 17 or the half-cut portions, making it easier to open and close the cover 13.

[0089] The sealing member 21 has one end 21a mounted on the cover sheet 13 and another end 21b opposite to the one end 21a. A claw-shaped retaining portion 23 is formed on the other end 21b of the sealing member 21 by engraving a cut line on the sealing member 21. The retaining portion 23 is formed in a position close to the other end 21b of the sealing member 21 and within a predetermined range. The retaining portion 23 is formed as follows: Figure 1 and Figure 3 In the state shown, the seal member 21 is formed with a cut line, but when the seal member 21 is held by the retaining receiving portion 26 formed on the top cover 2, that is, when the retaining portion 23 formed in a claw shape in this embodiment is inserted into the cut line formed as the retaining receiving portion 26, the seal member 21 is formed into a claw-shaped state protruding toward the surface 2a of the top cover 2. In this embodiment, as Figure 1 As shown in FIG, the shape of the holding portion 23 is triangular and formed in a manner such that the front end is pointed, but the shape of the holding portion 23 is not limited to a triangular shape. Figure 18 and Figure 19 As shown in FIG, the holding portion 23 may be formed into a semicircular shape and the claw-shaped holding portion 23 formed into the semicircular shape may be inserted into the holding receiving portion 26 to be held. In addition, the shape of the holding portion 23 is not limited to these shapes, and may be other shapes as long as it is formed in a manner to be held by the holding receiving portion 26. Figure 2 and Figure 4 The fold line 27 in the figure is formed when the gripping portion 24 of the sealing member 21 is pinched to cause the retaining portion 23 to protrude toward the top cover 2. Alternatively, the other end portion 21b may be bonded to the top cover 2 in advance using the adhesives listed above, as needed. This prevents damage to the sealing member 21 before use.

[0090] In addition, the raw material forming the sealing component 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, such as the above-mentioned paper raw material or the above-mentioned raw material in addition. In addition, as the raw material that can form the sealing component 21, for example, wood chips, film-shaped parts, metal parts, etc. can also be used. However, when using these parts, it is necessary to be able to form the retaining portion 23 and to be able to maintain the state in which the retaining portion 23 is retained in the retaining receiving portion 26. In other words, as long as the sealing component 21 is formed in the following manner, then any material can also be appropriately selected and used: the cover piece 13 can be pulled up by the user pinching the pinching portion 24 and operating it, and the retaining portion 23 is retained in the retaining receiving portion 26, and the state in which the mouth 12 is open can be maintained while the retaining portion 23 is retained in the retained portion.

[0091] Next, the effects of the mouth forming portion 11 in the cover 1 of the present invention will be described. Figure 7 As shown in (a), the user pinches the gripping portion 24 of the sealing member 21 in the cover body 1 and lifts the other end portion 21b of the sealing member 21. At this time, as previously described, when the other end portion 21b is engaged with the top cover 2, the user pinches the other end portion 21b of the sealing member 21 and peels the sealing member 21 off the surface 2a of the top cover 2 to release their engagement, thereby pinching the gripping portion 24 in the other end portion 21b of the sealing member 21 and lifting it. Next, as Figure 7 As shown in (b), when the user pinches the gripping portion 24 and pulls the sealing member 21 in the direction B, the cover piece 13, which is joined by the joint portion 22 at the one end portion 21a of the sealing member 21, is lifted in the direction C in the figure with the hinge portion 14 as the reference. At this time, since the sealing member 21 is joined at a position close to the one end portion 13a of the cover piece 13, the force in the direction C is easily applied by the user through the joint portion 22 with the hinge portion 14 as the fulcrum and the joint portion 22 as the force point. In addition, if the fold line 15 is formed at the location where the hinge portion 14 is formed, the cover piece 13 is more easily lifted in the direction C. Then, when the user further pulls the sealing member 21 in the direction B, the cover piece 13 continues to rotate in the direction C with the other end portion 13b as the center, thereby forming the mouth portion 12 in an open manner. In addition, at this time, the user can bend the other end 21b of the sealing member 21 while pinching the gripping portion 24 so that the holding portion 23 protrudes toward the surface 2a side of the top cover 2, or the user can bend the other end 21b of the sealing member 21 before reaching the vicinity of the holding receiving portion 26 and forming the holding portion 23 by inserting the holding portion 23 into the holding receiving portion 26. Figure 7As shown in (c), the user inserts the retaining portion 23 into the retaining receiving portion 26. By inserting the retaining portion 23 into the retaining receiving portion 26 in this way, the position of the sealing member 21 and the position of the opening of the cover 13 are physically fixed. That is, for example, if an adhesive seal is used to maintain the open state of the cover 13, then, especially if the contents are beverages or hot things, there is a high possibility that hot air or beverages will adhere to the back side of the cover 13, and even if it is sealed, it will often peel off immediately. Therefore, even if an attempt is made to fix the cover 13 with an adhesive seal, the adhesive force will gradually weaken over time, and sooner or later the seal will peel off and the cover 13 will return to its original position of the closed mouth 12. If such movement of the cover 13 occurs when, for example, the user brings the surface 2a of the top cover 2 close to the face in order to drink a beverage, there is a concern that the cover 13 will come into contact with the user's nose or face, causing discomfort to the user. However, the lid body 1 of the present invention physically fixes the sealing member 21 by holding the retaining portion 23 with the retaining receiving portion 26. Therefore, the lid piece 13 can be reliably prevented from attempting to return to its original position over time, and the mouth portion 12 can be continuously kept open. Therefore, even when the user attempts to pour the contents of the space 105 of the container 101 into the mouth, the lid piece 13 does not come into contact with the face, allowing for comfortable use.

[0092] Furthermore, according to the lid body 1 of the present invention, since the user operates the retaining portion 23 to pull up the lid sheet 13, the mouth 12 can be opened or the lid sheet 13 can be operated to close the mouth 12 without contacting the back side of the lid sheet 13. Therefore, since the user's fingers do not come into contact with, for example, the contents adhering to the back side of the lid sheet 13, the lid body 1 is hygienic and can also be operated comfortably when opening the mouth 12.

[0093] Furthermore, according to the lid body of the present invention, by operating the retaining portion while it is held by the retaining receiving portion, the lid flap can also be moved toward the closing portion. Therefore, by operating the retaining portion, the lid flap can be easily opened and closed multiple times. This allows for easy closing of the lid flap even when the contents of the container, such as a beverage, are not quickly consumed, and the lid flap can be maintained in a closed state. Furthermore, because the lid body 1 of the present invention is formed from paper, it is possible to provide a lid body that is also environmentally friendly.

[0094] Figure 11 (a) to (f) show examples of the mouth-forming portion 11. Figure 11The form of (d) is an example of the mouth-forming portion 11 formed on the cover body 1 described previously, but is also described here. In addition, specifically, the mouth-forming portion 11 is the same shape as the cover piece 13, and the mouth 12 also becomes the same shape when the cover piece 13 is opened. Here, although it is described as the shape of the mouth-forming portion 11, it is described as a shape that also includes the cover piece 13 and the mouth 12. First of all, the mouth-forming portion 11 is not limited to the shape described previously, and can be any shape selected, for example, as shown in the modified example described later. For example, Figure 11 The mouth-forming portion 11 shown in (a) has point-shaped joints 17 formed at a total of three locations, namely, one location on the one end side that becomes the one end 13a side of the mouth-forming portion 11, and one location each on the left and right midway from the one end side to the other end side that becomes the other end 13b side. In addition, on the other end side that becomes the other end 13b side, the cut line 16 forming the mouth-forming portion 11 is formed in a manner that draws an arc from the other end side toward the one end side. In addition, in this modified example, a stress relief portion 18 is formed on the other end 13b side of the cut line 16. The stress relief portion 18 is formed in an arc shape, and the end portion on the other end 13b side of the cut line 16 is located above the end portion on the other end 13b side of the mouth-forming portion 11. In addition, the stress relief portion 18 is formed in a manner that is located outside the mouth-forming portion 11. By forming the stress relief portion 18 in this manner, it is possible to prevent the top cover 2 from being damaged or the like due to a force applied to the cover piece 13 or the like when the cover piece 13 is moved to open the mouth portion 12 .

[0095] Figure 11 The mouth forming portion 11 shown in (b) is the same as the above Figure 11 The shape of (a) is the same as the shape of (a). Figure 11 In the mouth forming portion 11 shown in (b), in addition to the incision line 16, a folding line 15 is formed on the base end side. 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.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] Furthermore, it is more preferable that the point-shaped joint 17 is formed at least at the end portion on the side of one end portion 13a, i.e., at the most front end portion of one end side end portion. This can greatly reduce the concern that when the mouth forming portion 11 is normally subjected to a user's force via the sealing member 21, if the point-shaped joint 17 is not formed at the above-mentioned portion, the portion where the user's force is applied will be lifted up and the contents of the container 101 will leak out from the mouth 12. Figure 7 (a) to Figure 7 In the embodiment shown in (c), when forming the cover sheet 13 as the mouth forming portion 11, it can be formed by forming the cut line 16 or by forming the half-cut portion H. In addition, the cover sheet 13 as the mouth forming portion 11 can also be formed by other methods.

[0100] Figures 12 to 23 The seal member 21 is shown in FIG.

[0101] Figure 12 (a) shows an example of the sealing member 21 described previously, Figure 12 (b) shows an example in which the sealing member 21 is joined to the cover sheet 13 as the mouth forming portion 11 at the joint portion 22 and further extends to the front end side than the joint portion 22. Figure 12 (c) shows an example of joining in which the mouth forming portion 11 is covered as a whole by the sealing member 21. For example, if the Figure 12 As shown in (c) of FIG, by covering the cover sheet 13 as the mouth forming portion 11 as a whole with the sealing member 21, it is also possible to prevent the beverage or the like as the contents from leaking out of the gaps such as the incision line 16 around the cover sheet 13 to the surface of the top cover 2. That is, the sealing member 21 can cover the above-mentioned gaps. Thus, even when the container 101 with the cover body 1 installed is in a condition that is easy to shake, such as during delivery or takeout, or when the container 101 with the cover body 1 installed is in a condition that is easy to tilt, it is possible to prevent the beverage as the contents that is about to leak out of the top cover 2 from leaking out through the sealing member 21. Thus, a lid body 1 that does not leak can be further provided.

[0102] Figure 12 (d) shows an example of a sealing member 21 formed in a manner that covers the mouth-forming portion 11 and that makes the gripping portion formed at the other end narrower. This can further prevent leakage of the beverage as the content, and can make it easier for the user to pinch the other end 21b and operate. Figure 12 In (e), the front end portion of the sealing member 21 is flush with the front end portion of the mouth-forming portion 11. Even in this case, the sealing member 21 can effectively function.

[0103] and, Figure 13 The sealing component 21 shown is an example of covering the mouth forming portion 11 as a whole, and forming the joint portion 22 of one end portion 21a of the sealing component 21 at a position protruding from the one end portion 13a of the cover sheet 13. If the joint portion 22 is formed at such a position, not only the cover sheet 13 and the sealing component 21 can be joined, but also the surface 2a of the top cover 2 and the sealing component 21 can be joined. Therefore, in the state before the user operates the sealing component 21 (for example, when the cover body 1 is not in use), the sealed state at the mouth forming portion 11 can be further strengthened. In addition, Figure 13 The same is true for the embodiment shown in (b). Again, the sealing member 21 is joined to both the cover sheet 13 and the top cover 2 to improve the sealed state and sealing performance at the mouth-forming portion 11.

[0104] Figure 14 (a) and Figure 14 (b) shows another form of the sealing member 21. This sealing member 21 is different from the sealing member 21 previously illustrated in that the shape of the holding portion 23 is different. Figure 14 In the state shown in (a), the retaining portion 23 of the sealing member 21 is formed with a concave portion 33 formed in a narrowed width manner on the long side 32 of the sealing member 21. The end portion of the concave portion on the other end portion 21b side is formed as a hook portion 34. In addition, the sealing member 21 is formed with a bendable fold line 35 at a position close to the other end portion 21b in the width direction. Regarding the sealing member 21 formed in this way, if Figure 15 By folding the fold line 35 outward as shown, the two recesses 33 formed on the long side 32 become the retaining portions 23. Furthermore, when the cover 13 is pulled up to open the mouth 12, the recesses 33 in the retaining portion 23 of the sealing member 21 fit into the upper end of the side wall 3, and the hooks 34 engage with the outer side of the side wall 3 to retain the seal. In this case, the retaining receiving portion 26 becomes the side wall 3. That is, the retaining receiving portion 26 can be formed not only on the top cover 2 but also on the side wall 3. Alternatively, the side wall 3 itself can function as the retaining receiving portion 26.

[0105] Figure 16 and Figure 17 The figure shows another example of a sealing member 21. This sealing member 21 is formed in a key-shaped configuration, with a retaining portion 23 protruding leftward in the figure. Furthermore, a retaining receiving portion 26 is formed to receive the key-shaped retaining portion 23 and is positioned so that the front end 23a of the retaining portion 23 can be inserted therein. By inserting the front end 23a of the retaining portion 23 into the retaining receiving portion 26, the retaining portion 23 thus formed can maintain the lid 13 in the open position, thereby maintaining the mouth 12 in the open position.

[0106] Figure 20 and Figure 21 The figure shows another example of the sealing member 21. In this example, the retaining portion 23 is formed on the top cover 2, and the retaining receiving portion 26 is formed on the sealing member 21. With the retaining portion 23 and retaining receiving portion 26 formed in this manner, the retaining portion 23 of the top cover 2 is positioned upward relative to the surface 2a of the top cover 2 before the retaining portion 23 is inserted into the sealing member 21. This maintains the retaining portion 23 in the state in which it is retained. In other words, the lid 13 is opened, while the mouth 12 is kept open.

[0107] Figure 23 Shown is another example of a retaining receiving portion 26. In this example, the retaining receiving portion 26 is formed at multiple locations of the top cover 2, which is different from the previous example. If the retaining receiving portion 26 is formed in multiple locations in stages like this, the position of the inserting retaining portion 23 can be selected. That is, if the retaining receiving portion 26 is formed at multiple locations like this, the opening method of the cover 13 can be adjusted, in other words, the opening condition of the mouth 12 can be adjusted. If it is formed like this, for example, when a small amount of contents is discharged from the mouth 12 in the state installed in the container 101, the retaining portion 23 is inserted into the retaining receiving portion 26a, and when a large amount of contents is discharged from the mouth 12, the retaining portion 23 is inserted into the retaining receiving portion 26b, etc., the amount of discharged contents can be adjusted by the user.

[0108] Figures 24 to 30 The top cover 2 and side wall 3 of the cover of the present invention are shown in FIG. In addition, what is shown here is only an example, and other structures of the top cover 2 and side wall 3 can also be used. In addition, for the convenience of explanation, Figures 24 to 27 Description of the sealing member 21 is omitted.

[0109] Figure 24 The cover 1 shown is in a form in which the upper end of the rising portion 4 of the top cover 2 and the upper end of the side wall 3 are flush. Figure 24 As shown in (a), not only can the upper end of the rising portion 4 and the side wall 3 be flush, but also can be as shown in Figure 24 As shown in (b), the rising portion 4 is inserted into the inside so that the height position of the curved portion of the rising portion 4, which becomes the upper end, is flush with the upper end position of the side wall 3. Figure 24 As shown in (c), the height position of the bent portion of the rising portion 4 may be flush with the position of the upper end of the side wall 3 and the folded portion of the rising portion 4 may not reach the top cover 2. Figure 24 As shown in (d) and (e), the upper end position of the folded portion formed by folding the side wall 3 outward is aligned with the upper end position of the rising portion 4 and is flush.

[0110] Figure 25The example shown is an example in which a curling portion 41 as an extension is formed at the upper end of the cover body 1. The shape of the curling portion 41 can be as follows: Figure 25 The protruding portion is formed into a curled shape as shown, or the curled shape can be 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. Figure 25 In (a), the rising portion 4 and the side wall 3 are formed flush with each other and a curled portion 41 is formed on the side wall 3. Figure 25 (b) is the aspect in which the side wall 3 is formed with a curled portion 41. Figure 25 The example is the same as (a) but the rising portion 4 is formed lower than the side wall 3. Figure 25 (c) shows an example in which a curled portion 41 is formed on the side wall 3 and the rising portion 4 protrudes higher than the upper end position of the side wall 3. Figure 25 (d) shows an example in which the upper end of the rising portion 4 is located above the upper end of the side wall 3 and projects outward from the side wall 3 to form a curled portion 41. The curled portion 41 can also be formed in this manner.

[0111] Furthermore, the curled portion 41 not only increases the strength of the side wall 3 and the top cover 2, but also enhances the heat insulation effect. For example, when drinking hot beverages, the curled portion 41 can reduce the uncomfortable heat sensation on the lips and improve the feel of the mouth.

[0112] Figure 26 The figure shows a state where the rising portion 4 protrudes upwards compared to the side wall 3. Figure 26 In (a), the rising portion 4 protrudes upward compared to the side wall 3. Figure 26 (b) and Figure 26 In (c), the rising portion 4 is folded inwardly, and the position of the folded end portion protrudes upward compared to the upper end of the side wall 3. Figure 26 (d) and Figure 26 In (e), the side wall 3 is folded outward, and the upper end of the rising portion 4 protrudes upward from the position of the folded end.

[0113] Figure 27 Shown is the Figure 26 On the contrary, the upper end of the rising portion 4 is formed at a position lower than the upper end of the side wall 3. Figure 27 In (a), the upper end of the side wall 3 is located higher than the upper end of the rising portion 4. Figure 27 (b) and Figure 27 In (c), the rising portion 4 is folded inwardly and the upper end of the side wall 3 is located above the upper end of the folded portion. Figure 27 (d) and Figure 27In (e), the side wall 3 is folded outward, and the height position of the folded portion is higher than the upper end position of the rising portion 4.

[0114] Figure 28 (a) and Figure 28 (b) shows an example in which an inclined portion 51 is formed on the top cover 2. If the inclined portion 51 is formed on the top cover 2 like this, for example, after drinking a beverage, when the container 101 or the cover body 1 mounted on the container 101 is returned from an inclined state to a state in which the top cover 2 is horizontal, the beverage remaining on the inner surface of the upright portion 4 will easily transfer to the inclined portion 51 and return to the mouth 12. By forming the inclined portion 51 like this, it is difficult for the beverage to remain on the surface 2a of the top cover 2. In addition, when the inclined portion 51 is formed on the top cover 2 like this, the position of the mouth 12 can be as shown. Figure 28 As shown in (a) of FIG. 5 , it is formed at a position avoiding the inclined portion 51, or it can be formed as shown in FIG. Figure 28 As shown in (b) of FIG. 5 , the opening 12 is formed in a part of the inclined portion 51 . Figure 28 FIG. 1( c ) shows an example in which a guide portion 52 is formed at the lower end of the lower wall 6 of the previously described cover 1 . The guide portion 52 facilitates the installation of the cover 1 on the container 101 . The formation of the guide portion 52 allows for smoother installation of the cover 1 on the container 101 .

[0115] Figure 29 The figure shows another example of the form of the engaging portion 7 formed on the lower wall 6 of the cover 1 described above. Figure 29 (a) shows the form of the cover 1 described above, in which the engaging portion 7 is formed in a straight line with a tapered shape instead of bulging outward. Figure 29 (b) to (e) show the shape of the engaging portion 7 and the Figure 29 The shape described in (a) is similarly formed in a linear tapered shape, but without forming the rising portion 4, a downward rising portion 61 is formed to form the peripheral edge of the top cover 2. Such a configuration of the cover body 1 is also possible.

[0116] Figure 30 The illustrated example is a cover 1 having a downward rising portion 61 extending downward from the periphery of the top cover 2 , a side wall 3 formed to surround the downward rising portion 61 , and the downward rising portion 61 and the side wall 3 are joined. Figure 30 (a) is a case where the engaging portion 7 is formed into a straight tapered shape. Figure 30 The cover body 1 of (b) is in a form in which the engaging portion 7 bulges outward.

[0117] As described above, the cover body 1 of the present invention can be applied to such various forms of cover bodies 1. In addition, it can also be applied to cover bodies 1 of forms other than those described above. The cover body of the present invention has been described in detail above, but the above description is merely an example of the cover body of the present invention and is not limited to these cover bodies. Therefore, appropriate changes can be made within the scope of the present invention. In addition, the structure of the cover body described above can use the structure of the cover body of each example independently, or can be applied by appropriately combining the structures of the cover body of each example.

[0118] Description of Reference Numerals

[0119] 1 Cover

[0120] 2 Top cover

[0121] 3 Sidewalls

[0122] 4. Rising part

[0123] 5 upper wall

[0124] 6 lower wall

[0125] 7. Engagement

[0126] 11. Mouth-forming part

[0127] 12 Mouth

[0128] 13 Cover sheet

[0129] 21 Sealing parts

[0130] 23. Maintaining part

[0131] 26 Maintain the receiving portion.

Claims

1. A cover that is detachably mounted on a container mouth, wherein: The invention has a top cover and a side wall. The side wall surrounds the top cover and is formed from paper material into a tapered and inclined shape from the upper end side to the lower end side. The top cover and the side wall are integrated by joining a raised portion formed on the periphery of the top cover to the inner surface of the upper wall of the side wall. The inner peripheral side of the lower wall of the side wall which tapers and inclines from the upper end side to the lower end side has an engaging portion which engages with the container mouth in a state where the container mouth is sealed. The inner dimension of the lower end side of the engaging portion is formed smaller than the inner dimension of the upper end side of the engaging portion. The top cover includes a mouth forming portion forming a mouth for storing articles in the container. The mouth-forming portion has a cover piece for closing the mouth-forming portion. The cover piece is formed to be openable and closable via a hinge portion, and a stress relief portion is formed on a base end side where the hinge portion is formed, for relieving stress generated by a force applied when the cover piece is pulled up. The mouth forming portion has a cut line formed at a portion other than a portion where the hinge portion is formed. The stress relief portion is formed by bending in a direction away from the distance between adjacent incision lines in a portion where the hinge portion is formed, in a direction opposite to the direction in which the cover plate is formed, and the stress relief portion is formed in such a manner that the end portion on the hinge portion side of the incision line becomes a position deviated from the radial position where the hinge portion is formed, that is, a position toward the radial outside compared to the radial position.

2. The cover according to claim 1, wherein: The side wall is formed in a cylindrical shape by joining both end portions of the paper material.

3. The cover according to claim 1, wherein: The engaging portion of the lower wall of the side wall is formed in a shape that engages with the curled portion of the container mouth.

4. The cover according to claim 1, wherein: The engaging portion of the lower wall of the side wall is composed of an annular groove formed by pressing the inner peripheral surface of the lower wall.

5. The cover according to claim 1, wherein: When mounted on the container mouth, the lower end side of the engagement portion is mounted in a state where it does not come into contact with the side wall of the container.

6. The cover according to claim 1, wherein: The side wall is formed in an inclined shape at an inclination angle smaller than an inclination angle of a side wall of a container to which the cover is mounted.

7. The cover according to claim 1, wherein: The top cover is formed of paper raw material.

8. The cover according to claim 1, wherein: The top cover is formed of a film or a sheet.

9. The cover according to claim 1, wherein: A sealing member is mounted on the cover plate.

10. The cover according to claim 1, wherein: A curled portion is provided at the upper end.

11. The cover according to claim 9, wherein: The portion on one end side of the cover sheet to which the sealing member is attached is attached at a position offset from the center portion of the cover sheet.

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