cover body

Abstract

A lid for closing a mouth portion of a container, which is composed of a raw material mainly of paper material, has a side wall portion which is fitted to the mouth portion of the container, and a top cover portion which surrounds the side wall portion, the top cover portion having: an opening and closing portion which forms an opening and closing of an article accommodated in the container; and a temporary fixing portion for temporarily fixing the opening and closing portion to the top cover portion. Thus, a lid which is excellent in heat insulation, difficult to leak, easy for a user to use, reduced in manufacturing cost, and also able to take account of environmental problems can be realized.

Description

Cover

[0001] This invention application is a divisional application of the invention application with the international application date of July 30, 2020, international application number PCT / JP2020 / 029245, national application number 202080052997.9 which entered the Chinese national phase, and the invention title "Cover". Technical Field

[0002] The present invention relates to a lid that can be installed in a container. Background Technology

[0003] Traditionally, lids were installed on containers to seal the opening and prevent various stored items from leaking out. These lids were typically installed either inside or outside the container, sealing the internal space.

[0004] Various forms of items can be accommodated in containers. These include powdered and granular forms, as well as solid forms. Liquid forms, such as various beverages, are also considered. Among these various containers, liquids like beverages are most prone to leakage, especially when storing low-viscosity liquids, where a high degree of precision in sealing the container and lid is desirable.

[0005] Furthermore, in recent years, the use of beverage containers, especially in takeout and delivery services, has increased. Consequently, there is a demand for lids with higher sealing performance to prevent the beverage inside the container from leaking out. As such a beverage container lid, a lid with the configuration shown in Patent Document 1 is disclosed. As the lid of this beverage container, a plastic lid formed in a manner that allows it to be installed at the mouth of the container is disclosed.

[0006] Existing technical documents

[0007] Patent documents

[0008] Patent Document 1: Japanese Patent Application Publication No. 2016-169023 Summary of the Invention

[0009] If a plastic material is used for the beverage cap as described in Patent Document 1 above, there is a tendency to reduce the thickness in order to use various molding machines, such as vacuum forming, for molding. If the cap thickness is reduced in this way, when the contents of the container are hot beverages, the heat from the beverage flowing out of the opening is easily transferred to the cap, causing the user to feel heat and experience discomfort. In particular, since the human lips are sensitive to temperature, discomfort is even more likely when used as a beverage cap. To solve this problem, increasing the thickness of the plastic material has been considered. However, this would lead to an increase in the amount of plastic material used as raw material, resulting in increased weight, a feeling of heaviness, and increased manufacturing costs. Furthermore, when using a plastic material to form the cap, from a molding perspective, the opening that serves as the drinking spout must be positioned near the center. In this case, if used as a beverage cap, the beverage inside the container is difficult to flow out from the drinking spout, making it difficult to finish drinking the beverage in the container.

[0010] On the other hand, in recent years, there has been a growing emphasis on environmental issues and a strong desire to use environmentally friendly raw materials. However, the plastic lids described in Patent Document 1, cited earlier, are not environmentally friendly, and there is a growing preference for using environmentally friendly raw materials. In this regard, especially regarding environmental concerns, there has been a recent trend of exploring the use of paper materials to form containers. However, even when paper is used, only an opening is formed, or a sealing component is attached to the opening to seal it. This results in the following problems: poor heat insulation; because paper is soft, when the sealing component is removed and the opening is exposed, the beverage contents of the container will spray out from the opening. In addition, when a straw is inserted, if the opening becomes larger than the straw, the beverage is prone to spillage due to tilting and shaking.

[0011] The present invention was made in view of the following problems, and aims to form a cover that has excellent heat insulation, is difficult to leak, is easy for users to use, reduces manufacturing costs, and also takes into account environmental issues.

[0012] The essence of this invention is to provide the following cover.

[0013] (1) A cover for sealing the opening of a container, the cover being characterized in that it is made of a raw material mainly of paper, having a side wall portion that fits into the opening of the container, and a top cover portion surrounding the side wall portion, the top cover portion having: an inlet / outlet forming portion that forms an inlet / outlet for receiving articles inside the container; and a temporary fixing portion for temporarily fixing the inlet / outlet forming portion to the top cover portion.

[0014] (2) In the cover body of (1) above, the top cover has a groove between the inner edge of the entrance and the outer edge of the entrance forming part.

[0015] (3) In the cover body of (2) above, the top cover portion has a top cover edge portion at a portion closer to the side wall portion than the inlet / outlet forming portion, and the groove is formed between the outer edge portion of the inlet / outlet forming portion and the inner edge portion of the top cover edge portion.

[0016] (4) In the cover of (3) above, the temporary fixing part is formed in such a way that it spans the opening and closing part, the groove and the top cover edge.

[0017] (5) In the cover of (1) above, the temporary fixing part is temporarily fixed from the surface of the inlet and outlet forming part and the top cover part.

[0018] (6) In the cover of (2) above, the groove has a predetermined width between the inner edge of the entrance and the outer edge of the entrance forming part, and the width of the groove in the part where the temporary fixing part is formed is different from the width of the groove in the part where the temporary fixing part is not formed.

[0019] (7) In the cover of (6) above, the width of the groove in the part where the temporary fixing part is formed is narrower than the width of the groove in the part where the temporary fixing part is not formed.

[0020] (8) In the cover of (2) above, in the part where the temporary fixing part is formed, the inner edge of the entrance and exit contacts the outer edge of the entrance and exit forming part.

[0021] (9) In the cover of (3) above, a guide path is formed at the top edge of the cover to guide the contents contained in the container that come out of the opening toward the opening.

[0022] (10) In the cover of (1) above, the temporary fixing part is formed by ultrasonic bonding.

[0023] (11) In the cover of (9) above, the guide path is formed into a groove by ultrasonic bonding.

[0024] (12) In the cover body of (1) above, a sealing member is installed in the inlet and outlet forming part, and one end of the sealing member is temporarily fixed together with the inlet and outlet forming part and the top cover part by the temporary fixing part.

[0025] (13) In the cover of (1) above, the inlet and outlet forming part is provided at a position where the opening end of the container can be visually confirmed.

[0026] (14) In the cover of (1) above, the inlet and outlet forming part has a sealing piece that closes the inlet and outlet forming part.

[0027] (15) In the cover of (14) above, the closing piece is formed to be openable and closable via a hinge portion.

[0028] (16) In the cover of (15) above, a bend line is formed in the hinge portion.

[0029] (17) In the cover body of (15) above, on the closing piece, around the hinge portion, a dotted joint or a half-cut portion is formed on the top cover portion.

[0030] (18) In the cover of (17) above, the sealing piece forms an entrance / exit by cutting off the dotted joint or the half-section by a sealing member.

[0031] (19) In the cover of (15) above, the sealing piece has a stress-reducing portion formed on the base end side where the hinge portion is formed, which is used to reduce the stress generated relative to the force applied when the sealing piece is lifted.

[0032] (20) In the cover of (15) above, the closing piece is formed such that the width of the front end side away from the hinge portion is greater than the width of the base end side where the hinge portion is formed.

[0033] (21) In the cover of (15) above, the closing piece is formed such that the width of the base end side where the hinge portion is formed is the same as the width of the front end side at a position away from the hinge portion.

[0034] (22) In the cover of (19) above, the stress relief portion has a groove for dispersing the stress, the groove being formed to extend in a direction different from the direction of the force applied to the sealing sheet at the base end.

[0035] (23) In the cover of (1) above, a bend line is formed on the periphery of the entrance forming part near the side wall.

[0036] (24) In the cover of (12) above, the sealing member is installed at a position offset from the center of the inlet and outlet forming part.

[0037] (25) In the cover body of (12) above, the inlet and outlet forming part is provided at a position offset from the center of the top cover part, and the sealing member is installed in the inlet and outlet forming part at a position offset from the center of the top cover part.

[0038] (26) In the cover of (12) above, the sealing member is installed in the inlet and outlet forming part at the position furthest from the center of the top cover.

[0039] (27) In the cover of (12) above, the sealing member has one end installed on the inlet and outlet forming portion and another end opposite to the one end, the other end being installed on the surface of the top cover portion in a peelable state.

[0040] (28) In the cover body of (27) above, the other end is attached to the surface of the top cover in a peelable state at a predetermined position that approaches one end only at a predetermined distance from the other end of the sealing member, and a pinching portion is formed at the other end.

[0041] (29) In the cover body of (28) above, the pinching part is formed as a non-joining part that does not engage with the surface of the top cover part.

[0042] (30) In the cover body of (27) above, the other end is formed so that it can be reinstalled after being peeled off from the surface of the top cover.

[0043] (31) In the cover of (27) above, the sealing member is formed such that the installation strength at one end is greater than the installation strength at the other end.

[0044] (32) In the cover of (1) above, the inlet and outlet forming part is formed by punching.

[0045] (33) In the cover body of (32) above, the thickness of the blanking blade in the blanking process is less than 1.0 mm.

[0046] (34) In the cover of (12) above, the sealing member is provided in such a way that it covers at least a portion of the inlet and outlet forming portion.

[0047] (35) In the cover of (12) above, the sealing member has a width greater than or equal to the width of the inlet / outlet forming portion.

[0048] (36) In the cover of (12) above, the sealing member is configured such that one end extends further than one end of the inlet / outlet forming portion.

[0049] (37) In the cover of (12) above, the sealing member has a portion where one end engages with the surface of the top cover portion.

[0050] (38) In the cover of (12) above, the sealing member has a portion at one end that is not engaged with the surface of the top cover.

[0051] Invention Effects

[0052] According to the present invention, a lid for sealing the opening of a container is made of a raw material mainly composed of paper, and has a side wall portion that fits into the opening of the container, and a top cover portion surrounding the side wall portion. The top cover portion has: an inlet / outlet forming portion that forms an inlet / outlet for containing items inside the container; and a temporary fixing portion for temporarily fixing the inlet / outlet forming portion to the top cover portion, thereby making it difficult for items contained inside the container to leak out. Furthermore, it is easy for users to use, and manufacturing costs can be significantly reduced. Additionally, according to the present invention, a lid that also addresses environmental concerns can be provided. Attached Figure Description

[0053] Figure 1 is a perspective view showing the appearance of the cover of the first embodiment of the present invention. (a) shows the state in which the inlet / outlet forming part is closed, and (b) shows the state in which the inlet / outlet forming part is open.

[0054] Figure 2 is a perspective view showing the lid installed on the container.

[0055] Figure 3 is a top view of the cover when installed on a container.

[0056] Figure 4 is a partially enlarged sectional view of the lid when installed on a container.

[0057] Figure 5 is an explanatory diagram illustrating the shape of the entrance / exit forming section.

[0058] Figure 6 is an explanatory diagram used to illustrate the function and effect of the cover.

[0059] Figure 7 is an explanatory diagram illustrating a variation of the shape of the entrance / exit forming section. (a) is an explanatory diagram showing the first variation, (b) is an explanatory diagram showing the second variation, and (c) is an explanatory diagram showing the third variation.

[0060] Figure 8 is an explanatory diagram illustrating a variation in the method of installing the sealing component.

[0061] Figure 9 is an illustrative diagram illustrating other methods of installing sealing components.

[0062] Figure 10 is a perspective view of the cover of the second embodiment of the present invention.

[0063] Figure 11 is a top view showing a third embodiment of the cover of the present invention.

[0064] Figure 12 is a cross-sectional view of the cover body according to the third embodiment. (a) shows the state before the joint is formed, and (b) shows the state after the joint is formed.

[0065] Figure 13 is a cross-sectional view of the cover of the third embodiment in different ways. (a) is a view showing the state before the joint is formed, and (b) is a view showing the state after the joint is formed.

[0066] Figure 14 is a schematic diagram showing the joint pattern in the joint.

[0067] Figure 15 is an explanatory diagram showing a modified example of the cover of the third embodiment. (a) shows the state in which the inlet / outlet forming part is closed, and (b) shows the state in which the inlet / outlet forming part is open.

[0068] Explanation of reference numerals in the attached figures

[0069] 1. Cover

[0070] 2 side wall sections

[0071] 2a upper end

[0072] 2b lower end

[0073] 2C bending sheet

[0074] 3. Top Cover

[0075] 3a Top Cover Body

[0076] 3b Peripheral wall

[0077] 4. Entrance / Exit Formation Section

[0078] 5. Protruding part

[0079] 6 Hinges

[0080] 7. Bending lines

[0081] 8-blocking sheet

[0082] 8a one end

[0083] 8b other end

[0084] 8c base side

[0085] 8D front end

[0086] 9 Stress Relief Section

[0087] 11-point joint

[0088] 21 containers

[0089] 22 mouth

[0090] 23 Internal

[0091] 24 Extending part

[0092] 25 Erecting section

[0093] 31 Sealing components

[0094] 31a One end

[0095] 31b at the other end

[0096] 32 First joint

[0097] 33 Second joint

[0098] 34 Pinching Section

[0099] 51 Temporary Fixing Section

[0100] 52 engravings

[0101] 53 Top edge Detailed Implementation

[0102] First, the raw materials of the cover body of the present invention will be explained. The cover body of the present invention is formed from raw materials mainly composed of paper. Here, as the paper material, in addition to so-called paper made by bonding plant fibers and other fibers, chemical fiber paper, synthetic paper, water-resistant paper, coated paper, substitute paper, parchment paper, wool paper, glass fiber paper, stone paper, ceramic paper, etc. can also be mentioned. However, it is preferred to use a material that includes cellulose components such as pulp. More preferably, the proportion of cellulose components in the material is 50% by mass or more, even more preferably 60% by mass or more, more preferably 70% by mass or more, particularly preferably 80% by mass or more, and most preferably 90% by mass or more.

[0103] Here, pulp can be exemplified by wood pulp, non-wood pulp, synthetic pulp, and recycled paper pulp. More specifically, one or more of the following pulps can be appropriately selected for use: groundwood pulp (GP), pine pulp (SGP), wood chip groundwood pulp (RGP), pressurized groundwood pulp (PGW), thermomechanical pulp (TMP), chemithermomechanical pulp (CTMP), bleached chemithermomechanical pulp (BCTMP), and other mechanical pulps (MP); chemimechanical pulp (CGP), semi-chemical pulp (SCP), bleached pulp, etc. White sulfate hardwood pulp (LBKP), bleached sulfate softwood pulp (NBKP), sulfate pulp (KP), alkaline pulp (AP), acid sulfite pulp (SP), dissolving pulp (DP), and other chemical pulps (CP); synthetic pulps made from nylon, rayon, polyester, polyvinyl alcohol (PVA), etc.; rag pulp, straw pulp, fine needle grass pulp, sugarcane pulp, bamboo pulp, kenaf pulp, etc., and other stalk pulps, bast pulp, etc., made from waste paper pulp (TP), kapok, flax, hemp, jute, abaca, ramie, etc., and other auxiliary pulps.

[0104] Alternatively, paper materials with a resin coating layer on at least one side can be used as the paper material. When using a coated paper material, it is preferable to use it such that the coating layer is located at least on the inner surface of the container. The coating layer can be formed by a resin film and a coating agent. When forming the coating layer by bonding a resin film, the film can be a single-layer film or a multi-layer film, or a single-layer or multi-layer film can be bonded together. Furthermore, the coating agent can be one or more coating agents applied in overlapping layers to form the coating layer.

[0105] Resins that form the coating layer can include, for example, polystyrene, polyethylene, polypropylene, polyethylene terephthalate, polyurethane, polyvinyl chloride, polyvinylidene chloride, polyvinyl acetate, cyanoacrylate, epoxy resin, polyacrylic acid resin, polymethacrylic acid resin, nylon, polycarbonate; polycaprolactone, polyhydroxyalkanoates, polyhydroxybutyrate, polylactic acid, starch resins such as esterified starch, cellulose acetate, polyvinyl succinate, polyvinyl alcohol, polyethylene glycol, chitosan / cellulose / starch, poly(hydroxybutyrate / hydroxyhexanoate), poly(caprolactone / butene succinate), polybutene succinate, poly(butene succinate / adipate), and poly(butene succinate / carbonate). Naturally degradable resins and mixtures thereof, such as polyethylene terephthalate / succinate, poly(butylene adipate / terephthalate), and poly(tetramethylene adipate / butyl terephthalate); naturally degradable bio-resins and mixtures thereof; fluororesins, silicone resins, UV-curable resins, ethylene-vinyl acetate copolymers, ethylene-vinyl alcohol copolymers, ethylene-propylene copolymers, ethylene-propylene-butadiene copolymers, propylene-styrene copolymers, styrene-butadiene copolymers, acrylonitrile-butadiene-styrene copolymers, copolymers of monomers constituting the above resins, natural resins, paraffin wax, gelatin, celluloid, polymethylpentene, etc. The coating layer is preferably formed from naturally degradable resins, naturally degradable bio-resins, and other naturally degradable resins and these resins.

[0106] Examples of naturally degradable resins include natural resins, naturally degradable plastics, and bioplastics. Examples of naturally degradable plastics and bioplastics include, for instance, starch resins such as polycaprolactone, polyhydroxyalkanoates, polyhydroxybutyrate, polylactic acid, and esterified starch; cellulose acetate; polyvinyl succinate; polyvinyl alcohol; polyethylene glycol; chitosan / cellulose / starch; poly(hydroxybutyrate / ethyl hydroxyhexanoate); poly(caprolactone / butene succinate); poly(butene succinate / adipate); poly(butene succinate / carbonate); poly(ethylene terephthalate / succinate); poly(butene adipate / butyl terephthalate); and poly(tetramethylene adipate / butyl terephthalate), as well as mixtures of naturally degradable resins.

[0107] In addition, naturally degradable resins may also contain, for example, lubricants such as: ethylene distearate, fatty acid esters, fatty acid metal salts, fatty acids, oils, and glycerol fatty acid esters; stabilizers such as triphenyl phosphate, phthalic anhydride, dibutyl phthalate, and anhydrous acetic acid; inorganic materials such as titanium dioxide, kaolin, mica, soap clay, diatomaceous earth, magnesium oxide, silica sand aluminum, calcium carbonate, calcium hydroxide, and seashell powder; surfactants such as advanced 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 additives listed in the Japan Bioplastics Association's permitted list.

[0108] Furthermore, "natural degradability" refers to the property of reducing environmental burden through degradation by microorganisms, ultraviolet radiation, climate change, etc., in any environment, including air, soil, and water. Additionally, the lid of this invention is not limited to the contents of the container to which it is installed, and can be applied to lids that close containers capable of holding any type of contents.

[0109] (First Embodiment)

[0110] Next, the first embodiment of the lid 1 of the present invention will be described in detail using the accompanying drawings. Furthermore, the lid 1 of the present invention will be described as an example of a lid 1 suitable for containers (cups) for holding various beverages, such as coffee cups, but it is not limited to lids 1 for containers holding beverages; it can also be applied to lids 1 for containers holding food and groceries other than beverages. In addition, the lid 1 of the present invention can also be applied to lids 1 for various items other than food and groceries, such as bolts and nuts, and for containers holding other items. Furthermore, as for the lid 1 of this embodiment, an example of a circular shape when viewed from above will be used for explanation; however, the shape of the lid 1 is not limited to a circle, and it can also be polygonal, or various shapes that can be arbitrarily set other than polygonal.

[0111] As shown in Figures 1(a) and 1(b), the cover 1 has a side wall portion 2 that fits into the opening 22 of the container 21 (see Figure 4), and a top cover portion 3 surrounding the side wall portion 2. The top cover portion 3 has an inlet / outlet forming portion 4 that serves as the container's contents (in this embodiment, a beverage is used, but it could also be other items besides beverages, such as groceries or other items besides food and drink) stored inside the container 21's interior 23 (see Figure 4). A sealing member 31 is also installed in this inlet / outlet forming portion 4.

[0112] The sidewall portion 2 is formed to surround the periphery 3c of the top cover portion 3. As shown in FIG1(a), the sidewall portion 2 is formed in an inclined shape where the size decreases from the upper end portion 2a to the lower end portion 2b. In addition, a protrusion 5 is formed at the upper end portion 2a of the sidewall portion 2. The protrusion 5 is formed to protrude outward from the sidewall portion 2. In this embodiment, the protrusion 5 is formed by rolling up the paper material constituting the sidewall portion 2 and forming it into a coiled shape, but the protrusion 5 is not limited to being coiled in this way. For example, when forming the protrusion 5, it may be formed into a shape that is crushed in the vertical direction after being formed into the above-described coiled shape, or it may be formed by simply bending the paper material forming the sidewall portion 2 to extend outward from the upper end portion 2a. Alternatively, it may be formed by folding back the paper material forming the sidewall portion 2 at the upper end portion 2a. Moreover, it may be a shape other than the above-mentioned shapes. In this way, by forming the protrusion 5, not only can the overall strength of the sidewall portion 2 be improved, but the user can also easily drink the beverage in the drinking container 21. Furthermore, in this embodiment, an example in which the protrusion 5 is formed protruding from the sidewall portion 2 toward the outside of the sidewall portion 2 is used to illustrate the protrusion 5, but the protrusion 5 may also be formed in a way that protrudes from the sidewall portion 2 toward the inside of the sidewall portion 2.

[0113] Furthermore, the lower end 2b of the sidewall portion 2 is joined to the peripheral wall portion 3b of the top cover portion 3, which will be described later. The joining between the lower end 2b and the peripheral wall portion 3b can be performed using conventionally known joining methods, such as heat sealing and ultrasonic joining, or joining based on heat melting and adhesives. Moreover, the joining method is not limited to the methods described above, and other methods may also be used. In addition, as shown in FIG4, the peripheral wall portion 3b formed on the periphery of the top cover portion 3 is clamped and joined between the bent piece 2c formed by bending the lower end 2b of the sidewall portion 2 inward and the sidewall portion 2.

[0114] In this way, by joining the lower end 2b of the side wall portion 2 and the peripheral wall portion 3b, the overall strength of the cover 1 can be greatly improved, and the strength of the lower end 2b of the side wall portion 2, which is the part that fits into the container 21, can also be improved. That is, in this lower end 2b, three sheets of paper material are stacked and joined together in sequence from the outside, such as the lower end 2b of the side wall portion 2, the peripheral wall portion 3b, and the bending piece 2c, so the strength can be improved by increasing the paper thickness. In addition, as shown in FIG4, the cover 1 of this embodiment is formed such that the inner dimension D1 in the lower end 2b of the side wall portion 2 is smaller than the outer dimension D2 in the upper end 21a of the container 21. Therefore, when the cover 1 is installed into the container 21, the cover 1 fits into the upper end 21a of the container 21 while elastically deforming. When the lid 1 is installed on the container 21 in this way, as shown in FIG4, the outer surface of the protrusion 24 of the container 21 is in contact with the inner surface of the peripheral wall portion 3b of the lid 1 and the lower surface of the top cover body 3a, so that the lid 1 can be reliably installed relative to the container 21. In addition, when the lid 1 is installed relative to the container 21 in this way, the lid 1 is configured to be made of two or three sheets of paper material stacked together, so it is also difficult to detach from the container 21.

[0115] Furthermore, regarding the cover 1 of this embodiment, it is described that the inner surface of the lower end side 2b of the side wall portion 2 is joined to the outer surface of the peripheral wall portion 3b, and the inner surface of the peripheral wall portion 3b is joined to the outer surface of the bent piece 2c, but this configuration is not limited to this. For example, it is also possible to join only the outer surface of the peripheral wall portion 3b to the inner surface of the lower end side 2b of the side wall portion 2, or other methods described above. Moreover, in this embodiment, the bent piece 2c is formed such that it is joined from near the center of the height direction of the inner surface of the peripheral wall portion 3b to the lower end portion 2b in the inner surface of the peripheral wall portion 3b, but it is also possible that the bent piece 2c is formed such that its upper end portion is in close contact with the upper edge of the peripheral wall portion 3b, and the lower end portion of the bent piece 2c is located at the lower end portion 2b, or it may be formed in other positions. Furthermore, if the upper end of the bent piece 2c is located near the center of the inner surface of the peripheral wall portion 3b in the height direction as shown in FIG4, the upper end of the bent piece 2c can be engaged with the protrusion 24 of the container 21, and the container 21 can be reliably closed by the cover 1.

[0116] Furthermore, in this embodiment, the example of the sidewall portion 2 being formed in a circular shape is used for illustration, but the shape can be any shape other than a circle, such as an ellipse. Alternatively, it can be a polygonal shape such as a quadrilateral or a hexagonal shape, or a shape other than these. Furthermore, in FIG4, the inclination angle of the upright portion 25 constituting the sidewall of the container 21 is the same as the inclination angle of the sidewall portion 2 of the lid 1; in other words, the upright portion 25 is formed parallel to the sidewall portion 2, but this is not a limitation. For example, the inclination angle of the upright portion 25 and the inclination angle of the sidewall portion 2 can be different.

[0117] The top cover body 3a has an inlet / outlet forming portion 4 for passing through the inside and outside of the top cover body 3a and forming an inlet / outlet for the contents of the container. A sealing member 31 is also installed on the surface of the inlet / outlet forming portion 4. The peripheral wall portion 3b is formed by bending around the top cover body 3a, with its outer surface joined to the inner surface of the lower end side 2b of the side wall portion 2, and its inner surface joined to the outer surface of the bent piece 2c. The cover 1 is formed by joining the side wall portion 2 to the top cover portion 3.

[0118] Next, the inlet / outlet forming section 4 will be described. The inlet / outlet forming section 4 is used to form a through-hole through the inner and outer surfaces of the top cover body 3a. For example, when the cover 1 is installed on the container 21, this inlet / outlet forming section 4 forms an inlet / outlet S for the contents (e.g., drinks and food) inside the container 21. As shown in Figures 1(a), 1(b), 5(a), and 5(b), the inlet / outlet forming section 4 is located at a position offset from the center of the top cover body 3a of the top cover section 3. Furthermore, the top cover section 3 is provided with a closing piece 8 that closes the inlet / outlet forming section 4. As shown in Figure 4, in this closing piece 8, one end 8a located away from the center is a free end, and the other end 8b located near the center is a fixed end. A hinge portion 6 is formed at this other end 8b, and the closing piece 8 is formed to be able to open and close via this hinge portion 6. That is, the inlet / outlet forming section 4 is configured such that, with the hinge portion 6 in the other end 8b as a fulcrum, one end 8a can be opened and closed relative to the top cover body 3a. Furthermore, when the closing piece 8 operates with the hinge portion 6 as a fulcrum, it is preferable that a bend line 7 is formed on the hinge portion 6 (see Figures 5(a) and 5(b)). By forming the bend line 7 on the hinge portion 6, the opening and closing of the inlet / outlet forming portion 4 can be easily performed with reference to this bend line 7, and more specifically, the opening and closing of the closing piece 8 can be easily performed. Moreover, the position of the inlet / outlet forming portion 4 can be predetermined by the location where the bend line 7 is formed, and more specifically, the bending position of the closing piece 8 can be predetermined. Therefore, it is possible to prevent parts other than the location where the bend line 7 is formed from becoming fulcrums and causing the inlet / outlet forming portion 4 (closing piece 8) to bend, and the inlet / outlet forming portion 4 can be reliably bent at the location where the bend line 7 is formed. Furthermore, the bend line 7 can be formed, for example, by linear pressing using a stamping machine or the like. That is, the bend line 7 can be formed by linear stamping at the predetermined location where the bend line 7 is formed using a stamping machine or the like. By bending the closure piece 8 only at the specific location where the bend line 7 is formed, the deviation of the bending position of the closure piece 8 can be significantly reduced. Furthermore, any conventionally known method can be appropriately selected to form the bend line 7.

[0119] With the cover 1 installed on the container 21, if the sealing piece 8 is opened, as shown in FIG3, the inlet / outlet forming part 4 is located at the following position: on the front end side of the inlet / outlet S, in other words, on the end side near the periphery of the top cover body 3a, the protrusion 24 of the container and the opening 22 and the interior 23 located therein can be visually confirmed.

[0120] Furthermore, as shown in Figures 5(a) and 5(b), the entrance / exit forming portion 4 is approximately quadrilateral in shape. At the upper center of Figures 5(a) and 5(b), a protrusion 4a is formed that protrudes upwards compared to other portions. The protrusion 4a is formed in the direction toward the periphery formed by the peripheral wall portion 3b of the top cover body 3a. For example, as shown in Figure 5(a), in this entrance / exit forming portion 4, a bending line 7 is formed, for example, in the area where the hinge portion 6 is formed. In areas other than the area where the hinge portion 6 is formed, a scribe line C is formed in a predetermined shape (approximately quadrilateral in Figure 5(a)). At multiple predetermined locations along the scribe line C, the top cover body 3a and the sealing piece 8 are partially joined by dotted joints 11. By forming the inlet / outlet forming portion 4 in this way, when the sealing member 31 pulls or lifts it, the point joint portion 11 will be cut off, and the joint in the point joint portion 11 will be released.

[0121] Furthermore, as shown in Figure 5(b), the entrance / exit forming portion 4 has a bend line 7 formed in the portion where the hinge portion 6 is formed, as described above, and in the portion where the hinge portion 6 is not formed, a half-cut portion H is formed, which integrally forms a cut-off line K. Additionally, the entrance / exit forming portion 4 has a cut-off line K, and the point-joint portion 11 is formed without being cut off. Furthermore, when the entrance / exit forming portion 4 is formed as a half-cut portion H around its perimeter, a portion without the point-joint portion 11 as described above is not formed, and the thickness is reduced only in the portion where the half-cut portion H is formed. Furthermore, when the half-cut portion H is formed, it is also possible to consider not forming a point-joint portion on the cut-off line K, but only forming the portion where the half-cut portion H is formed, or it is also possible to consider using both the half-cut portion H and the notch line C. In addition, the sealing piece 8 is lifted or pulled by the sealing member 31, thereby cutting off the point joint 11 or the half-cut-off portion H, thus forming the inlet and outlet S.

[0122] As shown in Figures 5(a) and 5(b), a stress-reducing portion 9 is formed on the base end side 8c where the hinge portion 6 is formed on the sealing plate 8. This stress-reducing portion 9 is used to reduce the stress generated relative to the force applied when lifting the sealing plate 8. In the manner shown in Figure 5(a), the stress-reducing portion 9 is formed in a curved shape toward the hinge portion 6. That is, the stress-reducing portion 9 is formed in such a way that it serves as a groove for dispersing the aforementioned stress, and this groove is formed in the base end side 8c in a direction different from the direction of the force applied to the sealing plate 8. Moreover, as shown in Figures 5(a) and 5(b), the sealing plate 8 has a generally quadrilateral shape in which the width of the base end side 8c where the hinge portion 6 is formed is the same as the width of the front end side 8d at the position away from the hinge portion 6.

[0123] Figures 7(a), (b), and (c) show variations of the inlet / outlet forming portion 4. Specifically, this inlet / outlet forming portion 4 has the same shape as the sealing plate 8, and when the sealing plate 8 is open, it also has the same shape as the inlet / outlet S. Here, while the shape of the inlet / outlet forming portion 4 is described, the description also includes the sealing plate 8 and the inlet / outlet S. First, the inlet / outlet forming portion 4 is not limited to the shape described previously; for example, as shown in the variations described later, it can be any shape. For example, the inlet / outlet forming portion 4 shown in Figure 7(a) forms point-like joint portions 11 in a total of three locations: one location on one end side (the front end side), and one location on each side midway from one end side to the other end side (the base end side). Furthermore, on the other end side (the base end side), the notch line C forming the inlet / outlet forming portion 4 is formed by drawing an arc from the other end side towards the one end side. Additionally, in this variation, a stress-reducing portion 9 is formed on the base end side of the notch line C. The stress-reducing portion 9 is formed in an arc shape, with the base end of the scribe line C positioned above the base end of the inlet / outlet forming portion 4. Furthermore, the stress-reducing portion 9 is formed to be located on the outer side compared to the inlet / outlet forming portion 4. By forming the stress-reducing portion 9 in this way, when the sealing plate 8 is moved to open the inlet / outlet S, damage to the top cover portion 3 caused by the force applied to the sealing plate 8, etc., can be prevented.

[0124] The inlet / outlet forming portion 4 shown in Figure 7(b) has the same shape as that in Figure 7(a). Furthermore, in the inlet / outlet forming portion 4 shown in Figure 7(b), a bend line 7 is formed on the base end side in addition to the notch line C, and a bend line 10 is formed on the front end side. This bend line 7 is formed at a specific position where, when the closing piece 8, which is the inlet / outlet forming portion 4, is in an upright position (i.e., when the inlet / outlet S is open) after being in a lying position (i.e., a state where the inlet / outlet S is closed), the base end of the closing piece 8 is bent. Thus, by forming the bend line 7 on the base end side of the inlet / outlet forming portion 4, the uprighting method and deviation during uprighting can be effectively suppressed.

[0125] Furthermore, by forming the bend line 10 at the front end of the entrance / exit forming section 4, a bend in the top cover body 3a of the entrance / exit forming section 4 can be specifically formed. As a result, when the entrance / exit forming section 4 moves from a lying state to an upright state, the impact on the front end of the entrance / exit forming section 4 can be reduced.

[0126] In the inlet / outlet forming section 4 shown in FIG7(c), the shape differs from that in FIG7(a) in that the width dimension of the front end side is larger than that of the base end side. By forming the inlet / outlet forming section 4 in this way, not only can the above-mentioned effects be obtained, but also, for example, when the contents of the container 21 contain solids such as ice, the risk of such solids flying into the user's mouth can be more reliably prevented when the user uses the container. Furthermore, the dotted joint 11 is omitted in FIG7(c), but it is also appropriate to provide the dotted joint 11.

[0127] Preferably, the dotted joint 11 is formed at least at the foremost end of one end side of the end that serves as the front end. Normally, the inlet / outlet forming portion 4 is subjected to force by the user via the sealing member 31. However, if the dotted joint 11 is not formed at the aforementioned location, a lifting force is generated when force is applied to the user, which can significantly reduce the risk of leakage of the contents of the container 21 from the inlet / outlet S. Furthermore, in the manner shown in Figures 7(a) to 7(c), it can also be achieved by forming a notch line C near the sealing piece 8 forming the inlet / outlet forming portion 4, or by forming a semi-cut-off portion H. Alternatively, the sealing piece 8 serving as the inlet / outlet forming portion 4 can also be formed in other ways.

[0128] As shown in Figures 3 and 4, the inlet / outlet forming portion 4 is located at the opening 22 of the container 21, which is the open end, so that the container 21 can be visually confirmed. Specifically, as shown in Figure 3, when the lid 1 is viewed from above, the inlet / outlet forming portion 4 is open, and the inlet / outlet S is open. At this time, from the protrusion 4a of the inlet / outlet S, a protrusion 24 on the container 21 side after the lid 1 is installed is provided at a position that can be visually confirmed. In particular, in this case, as shown in Figure 4, it is preferable that the front end of the inlet / outlet S of the lid 1 is located at the apex of the protrusion 24 on the container 21 side. By forming it in this way, when the user drinks the beverage in the container, the undesirable situation of some beverage residue remaining in the container can be eliminated. Therefore, the inlet / outlet forming portion 4 is located at a position away from the center of the top cover body 3a.

[0129] Furthermore, the inlet / outlet forming portion 4 can be formed using any die-cutting method or conventionally known methods equivalent to die-cutting. In the aforementioned die-cutting process, to form the inlet / outlet forming portion 4, it is preferable that the thickness of the cutting blade used during the punching process is 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 cutting blade is 0.4 mm or less, it is difficult to form a gap with the scribe line C while forming the scribe line C, depending on the characteristics of the cut paper material. Therefore, leakage from the scribe line C can be significantly reduced.

[0130] In the case of the lid 1 of a container into which a beverage is placed, as in this embodiment, the inlet / outlet S is formed in such a way as a drinking spout that allows the beverage in the container 21 to flow out of the container 21 when the user drinks from it. Additionally, the inlet / outlet S is also formed in such a way as an insertion port for inserting an object such as a straw into the interior 23 of the container 21. The inlet / outlet forming portion 4 is used to form such an inlet / outlet S. As shown in Figure 5, the inlet / outlet forming portion 4 is formed in a predetermined size and shape on the surface of the top cover body 3a by forming a scribe line C and a half-section H. There are various ways to form the scribe line C and the half-section H, so a conventionally known method can be appropriately selected. Alternatively, only the scribe line C or only the half-section H can be formed as needed, or only the dotted joint 11 can be partially joined. The scribe line C and the half-section H are respectively provided in the parts other than the dotted joint 11, or these scribe lines C, half-section H and dotted joint 11 can be formed by any combination.

[0131] As shown in Figure 1, a sealing member 31 is installed in the inlet / outlet forming portion 4. A first joint portion 32 is formed at one end 31a of the sealing member 31. This first joint portion 32 is used to join with the sealing sheet 8 constituting the inlet / outlet forming portion 4 by various methods such as ultrasonic bonding, heat sealing, and adhesive-based bonding. As for the bonding method of the first joint portion 32, from the viewpoint of bonding difficulty and bonding strength, ultrasonic bonding is preferred. The portion on the side of the end 31a on which the sealing member 31 is installed in the inlet / outlet forming portion 4 is installed at a position offset from the center of the sealing sheet 8, which is the inlet / outlet forming portion 4. Furthermore, it is installed in the sealing sheet 8 at a position away from the center of the top cover portion 3, which is the inlet / outlet forming portion 4. Furthermore, it is installed at the position furthest from the center of the top cover portion 3. That is, the sealing member 31 is installed in the sealing sheet 8 at a position close to one end 8a. In other words, the inlet / outlet forming portion 4 is formed in such a way that the sealing member 31 is joined to one end of the top cover body 3a. In particular, the engagement of the inlet / outlet forming portion 4 and the sealing member 31 is preferably formed in the closing piece 8 on the end 8a side that is separate from the hinge portion 6.

[0132] In this way, in the sealing plate 8, which serves as the entrance / exit forming part 4, as long as the sealing member 31 is engaged at a position that is further away from the hinge part 6, the distance from the force point (fulcrum) relative to the hinge part 6 can be increased. As a result, when the sealing member 31 is lifted, force is applied to the sealing plate 8 via the sealing member 31, releasing the engagement in the point-joint part 11 and the half-cut part, making it easier to open and close the sealing plate 8.

[0133] As shown in Figures 1, 8, and 9, the sealing member 31 is installed at a position offset from the center of the inlet / outlet forming portion 4, specifically at a position offset towards the front end compared to the center of the inlet / outlet forming portion 4. Furthermore, the sealing member 31 is installed in the inlet / outlet forming portion 4 at a position moving away from the center of the top cover body 3a towards the periphery. Moreover, it is preferable that the sealing member 31 is installed in the inlet / outlet forming portion 4 at the position furthest from the center of the top cover body 3a.

[0134] Furthermore, the sealing member 31 has one end 31a installed on the inlet / outlet forming portion 4 and another end 31b opposite to the first end 31a. At the other end 31b of the sealing member 31, a second joint 33 is formed, which is bonded to the surface of the top cover body 3a with a weaker adhesive strength compared to the first joint 32. This second joint 33 is formed in the sealing member 31 at a location near the other end 31b and within a predetermined range. The bonding force in the second joint 33 is weaker than the bonding force in the first joint 32, and is engaged with a force sufficient to allow easy peeling from the surface of the top cover body 3a by the user's force. In other words, the other end 31b is installed on the surface of the top cover body 3a in a peelable state at a predetermined position, only a predetermined distance from the other end of the sealing member 31 towards the first end 31a. Additionally, a pinching portion 34 is formed at the other end 31b of the sealing member 31. This pinching portion 34 is formed as a non-jointing portion that does not bond to the surface of the top cover body 3a. Furthermore, the other end 31b is configured to be reinstallable after being peeled off from the surface of the top cover body 3a. The sealing member 31 is preferably configured such that the installation strength at one end 31a is greater than the installation strength at the other end 31b. As a way to reduce the installation strength in the second joint 33 compared to the first joint 32, a material with weak adhesive strength can be used, for example. Alternatively, even if the adhesive itself has the same strength, adjustments can be made by changing the amount and method of application of the adhesive, or other methods can be used; any conventionally known method can be chosen. Furthermore, in the sealing member 31, in areas with low adhesive strength (installation strength), it is configured to be re-engaged after being peeled off from the top cover body 3a. In areas with high adhesive strength, such as the area where one end 31a of the sealing member 31 engages with the sealing piece 8, which serves as the inlet / outlet forming portion 4, it is considered that engagement can be performed using any conventionally known method, but ultrasonic engagement is preferred.

[0135] Figure 8 shows a modified example of the sealing member 31. Figure 8(a) shows an example of the sealing member 31 described above, and Figure 8(b) shows an example in which the sealing member 31 is engaged with the closure piece 8, which serves as the inlet / outlet forming portion 4, in the first joint portion 32, and extends to the front end side compared to the first joint portion 32. In addition, Figure 8(c) shows an example in which the inlet / outlet forming portion 4 is entirely covered by the sealing member 31. For example, as shown in Figure 8(c), if the closure piece 8, which serves as the inlet / outlet forming portion 4, is entirely covered by the sealing member 31, it is possible to prevent beverages or the like from leaking from the gaps such as the groove lines C around the closure piece 8 to the surface of the top cover body 3a. In other words, the sealing member 31 can cover the aforementioned gaps. Therefore, even when the container 21 with the lid 1 is prone to shaking, such as during delivery or takeout, or when the container 21 with the lid 1 is prone to tilting, the sealing member 31 can prevent the beverage contents that want to leak out of the top cover body 3a from leaking out. Thus, a lid 1 that is less prone to leakage can be provided.

[0136] Figure 8(d) shows an example in which the inlet / outlet forming portion 4 is covered, and the pinching portion formed at the other end is made thinner. This design better prevents leakage of the beverage contents, as described above, and allows the user to easily pick up the other end 31b for easier operation. Furthermore, Figure 8(e) shows an example in which the front end portion of the sealing member 31 and the front end portion of the inlet / outlet forming portion 4 are made of the same surface. This also effectively enables the sealing member 31 to function properly.

[0137] Furthermore, the sealing member 31 shown in FIG. 9 completely covers the inlet / outlet forming portion 4, and the adhesive portion at one end of the sealing member 31 (the smaller transversely elongated quadrilateral twill portion in FIG. 9) has strong adhesive strength, while the adhesive portion at the other end of the sealing member 31 (the portion located below the previously described twill portion in FIG. 9 and represented by a transversely elongated quadrilateral larger than the previously described twill portion) has weak adhesive strength and can be peeled off again. With this configuration, the inlet / outlet forming portion 4 is completely covered by the sealing member 31, thus reliably preventing leakage of the beverage contents to the outside, for example, during delivery.

[0138] Furthermore, Figure 10 is a diagram illustrating the second embodiment. Figure 10 shows an example of a cover in which the upper end of the side wall portion 2, as previously described, is not present, and the side wall portion 2 does not protrude compared to the top cover body 3a in the top cover portion 3. Even with a cover 1 of this shape, the present invention can be applied.

[0139] In this embodiment, the cover 1 is typically in the state shown in FIG. 6(a). That is, the sealing member 31 is engaged with the surface of the top cover body 3a of the top cover portion 3, and the sealing piece 8, which serves as the inlet / outlet forming portion 4, is also in a closed state. In this state, the user pinches the gripping part 34 and peels off the seal in the second joint portion 33, which is bonded to the other end 31b side of the sealing member 31. FIG. 6(b) shows the state in which the seal in the second joint portion 33 is peeled off in this way. Furthermore, as shown in FIG. 6(c), after the user peels off the seal in the second joint portion 33, if the user pulls in the direction opposite to the part where the sealing piece 8, which serves as the inlet / outlet forming portion 4, is formed (direction F in FIG. 6), a pulling force in the direction F is applied to the sealing piece 8, which serves as the inlet / outlet forming portion 4, via the sealing member 31. At this time, near the front end of the sealing plate 8, which serves as the inlet / outlet forming part 4, a sealing member 31 is firmly joined in the first joint 32 by ultrasonic bonding or the like. As a result, the sealing plate 8, serving as the inlet / outlet forming part 4, moves towards the opening direction of the inlet / outlet S, with the hinge 6 as the fulcrum. Furthermore, as shown in FIG6(d), the sealing plate 8, serving as the inlet / outlet forming part 4, moves until the inlet / outlet S becomes open. Finally, after the sealing plate 8, serving as the inlet / outlet forming part 4, has finished moving, the user reattaches the sealing member 31 to the surface of the top cover body 3a. At this time, the seal in the second joint 33 can be re-bonded even if it has been peeled off, thus allowing for repeated peeling and re-bonding. Therefore, even if it has been peeled off, it can be re-bonded.

[0140] In this way, the cover 1 of the present invention forms a sealing sheet 8 that serves as the inlet / outlet forming portion 4, thereby significantly reducing leakage of beverages and contents to the outside of the container 21 and making it an environmentally conscious design. Furthermore, since the inlet / outlet S is typically covered by the inlet / outlet forming portion 4, heat insulation for the beverage contents is also achieved.

[0141] Next, a third embodiment of the cover 1 of the present invention will be described. Furthermore, for the cover of this embodiment, the same descriptions as previously described will be omitted, and the same reference numerals will be used.

[0142] As shown in Figure 11, the cover 1 of this embodiment is used to seal the opening of a container (not shown). It is made of a raw material mainly composed of paper and has a side wall portion 2 that fits into the opening of the container and a top cover portion 3 surrounding the side wall portion 2. Furthermore, the top cover portion 3 has an inlet / outlet forming portion 4 that forms the inlet / outlet S for containing items inside the container, and a temporary fixing portion 51 for temporarily fixing the inlet / outlet forming portion 4 to the top cover portion 3. Additionally, the top cover portion 3 has a notch 52 between the inner edge S1 of the inlet / outlet S and the outer edge 4b ​​of the inlet / outlet forming portion 4. Furthermore, the top cover portion 3 has a top cover edge portion 53 located closer to the side wall portion 2 than the inlet / outlet forming portion 4, and the notch 52 is formed between the outer edge 4b ​​of the inlet / outlet forming portion 4 and the inner edge of the top cover edge portion 53.

[0143] In Figure 11, the temporary fixing part 51 is formed by extending across the entrance / exit forming part 4, the notch 52, and the top cover edge part 53. Furthermore, the temporary fixing part 51 temporarily fixes itself to the surfaces of the entrance / exit forming part 4 and the top cover part 3.

[0144] Furthermore, the notch 52 has a predetermined width H1 between the inner edge S1 of the entrance / exit S and the outer edge 4b ​​of the entrance / exit forming portion 4. The width H2 of the notch 52 in the portion where the temporary fixing portion 51 is formed is different from the width of the notch 52 in the portion where the temporary fixing portion 51 is not formed. That is, the notch 52 has a width of H1 in the portion where the temporary fixing portion 51 is formed, and a width of H2 in the portion where the temporary fixing portion 51 is not formed. Moreover, there is a relationship of H2 > H1 between the widths H1 and H2, and the width H1 of the notch 52 in the portion where the temporary fixing portion 51 is formed is narrower than the width H2 of the notch 52 in the portion where the temporary fixing portion 51 is formed. In addition, as described above, the width H2 of the notch 52 in the portion where the temporary fixing portion 51 is not formed is the same as the width of the notch 52 before the temporary fixing portion 51 is formed. Therefore, Figures 12 and 13 show the width of the notch 52 in the state before the temporary fixing portion 51 is formed.

[0145] Furthermore, from the viewpoint of preventing leakage of contents, it is preferable that the width H2 of the notch 52 in the area where the temporary fixing part 51 is formed is small. That is, it is preferable that the width H2 of the notch 52 in the area where the temporary fixing part 51 is formed is 0 (zero), in other words, the inner edge S1 of the inlet / outlet S contacts the outer edge 4b ​​of the inlet / outlet forming part 4, and it is even more preferable that the inner edge S1 of the inlet / outlet S and the outer edge 4b ​​of the inlet / outlet forming part 4 are in close contact with each other in a way that exerts a force that presses against each other. By setting the width of the notch 52 in this way, it is possible to prevent the formation of several gaps between the top cover part 3 and the inlet / outlet forming part 4 in advance, and therefore, the risk of beverage leakage from the gaps in the notch 52 can be significantly reduced.

[0146] In addition to ultrasonic bonding, the temporary fixing part 51 can be used by any of the conventionally known methods, such as heat sealing, heat melting, and bonding using adhesives. However, among the conventionally known bonding methods, ultrasonic bonding is preferred for forming the temporary fixing part 51. When using ultrasonic bonding, as shown in FIG12(a) and FIG13(a), the object to be bonded is clamped by the welding head 61 and the anvil 62, and then ultrasonic bonding is performed. The object to be bonded (e.g., the top cover 3 in this invention) is clamped and pressed from the surface and back by the welding head 61 and the anvil 62. As shown in FIG12(b) and FIG13(b), when the paper material 3P forming the top cover 3, or when various film components such as polyethylene film are laminated on at least one side of the surface or back of the paper material 3P (both the surface and back in FIG13), these film components F1 and F2 can extend in the X direction in FIG12(b) and FIG13(b). Therefore, as described above, the width of the notch 52 is narrowed, or more preferably, eliminated to facilitate contact or tight fit. Thus, when ultrasonic bonding is used to form the temporary fixing portion 51, leakage of the beverage contents can be further reduced.

[0147] The temporary fixing part 51 is configured such that, as described above, the inlet / outlet forming part 4 (more specifically, the sealing piece 8) is joined to the top cover part 3 (more specifically, the top cover edge part 53) in the top cover part 3, thereby temporarily fixing the inlet / outlet forming part 4 relative to the top cover part 3. However, this temporary fixing part 51 is not limited to this method. For example, as shown in FIG11, when the inlet / outlet forming part 4 is provided with a sealing member 31, it may also be joined together with one end 31a of the sealing member 31. That is, in the previously described embodiment, when joining the sealing member 31 to the inlet / outlet forming part 4, an example of joining by various methods such as ultrasonic joining in the first joining part 32 was used to illustrate the method. However, for example, the temporary fixing part 51 can also be configured by offsetting the joining portion of the first joining part 32. By forming it in this way, the temporary fixing part 51 can also be formed together with the first joining part 32, thereby greatly improving the manufacturing efficiency of the cover 1.

[0148] Furthermore, in the case where the temporary fixing part 51 is formed together with the first joint 32, the position of the sealing member 31 in the inlet / outlet forming part 4 can be arbitrarily set, but preferably, the position of one end 31a of the sealing member 31 is the same as the position of the front end of the inlet / outlet forming part 4, or is located closer to the hinge part 6 than the position of the front end. By arranging the sealing member 31 in this way, it is easier to form the first joint 32 and the temporary fixing part 51.

[0149] As described above, Figure 12(a) illustrates the ultrasonic bonding process using an example where the top cover 3 is formed solely of paper material 3P. In this way, the sealing member 31, the inlet / outlet forming portion 4 (sealing plate 8), and the top cover 3 (top cover edge 53) are clamped and pressed together by the welding head 61 and the anvil 62, and subjected to ultrasonic waves, thereby enabling bonding and temporary fixation. In this bonding and temporary fixation process, the width H2 of the groove formed between the inlet / outlet forming portion 4 and the top cover 3 becomes width H1, as shown in Figure 12(b), and the width of the groove 52 becomes narrower. Preferably, this width is zero, as described above. Furthermore, in Figure 12(b), the unevenness in the area where the first bonding portion 32 and the temporary fixing portion 51 are formed is a pattern formed on the welding head 61.

[0150] Figure 13(a) shows an example where the top cover 3 is formed by laminating paper material 3P and film components F1 and F2. In the case of the top cover 3 formed in this way, it is clamped by the welding head 61 and the anvil 62 and subjected to ultrasonic waves in the same way as described above, thereby forming the first joint 32 and the temporary fixing part 51. In this case, the width of the notch 52 is the same as that described in Figures 12(a) and 12(b). Furthermore, as shown in Figures 13(a) and 13(b), when the top cover 3 is formed by laminating paper material 3P and film components F1 and F2, not only paper material 3P, but also film components F1 and F2 extend in the same direction as paper material 3P, making the width of the notch 52 narrower. Therefore, not only does the paper material 3P contact make the width of the slit 52 zero, but the film components F1 and F2 also contact to make the width of the slit 52 zero. Thus, it is more effective to prevent the contents (such as beverages) inside the container 21 from leaking out.

[0151] Figure 14 shows an example of a welding head pattern used in ultrasonic bonding. As shown in Figure 14(a), a pattern of multiple rectangles arranged horizontally and vertically can be used, or as shown in Figure 14(b), a pattern of multiple rectangles arranged horizontally and vertically can be combined with a radially extending pattern. Furthermore, the pattern is not limited to these two; any pattern can be appropriately selected for use.

[0152] The effect of ultrasonic bonding using the pattern shown in Figure 14(b) is explained. When using this pattern, as shown in Figure 15(a), the radially extending pattern described earlier can be formed on the top cover 3 at the top cover edge 53. Furthermore, when ultrasonic bonding is used, the paper material constituting the top cover 3 is pressed as described above, thereby forming the pattern in a groove shape on the surface of the top cover 3. This groove-shaped pattern becomes a guide portion 56. This guide portion 56 prevents the beverage, for example, from leaking out of the container 21 from the top cover edge 53, and guides it back into the container 21 through the inlet S. Therefore, no beverage remains on the top cover edge 53, allowing the cover 1 to be used in a clean state. Furthermore, beverage residue on the top cover edge 53 will not stain clothes or hands, further reducing unpleasantness and allowing for comfortable use.

[0153] Furthermore, by forming the first joint 32 and the temporary fixing part 51 in this way, the distance from the hinge part 6 to the first joint 32 can be ensured to be long. In this way, by ensuring a long distance from the hinge part 6 to the first joint 32, it is easier to open the inlet / outlet forming part 4 when pulling the other end of the sealing member 31. For example, by forming it in this way, the inlet / outlet forming part 4 can be opened with less force.

[0154] The cover of the present invention has been described in detail above, but the foregoing description is merely an example of the cover of the present invention and is not limited thereto. Therefore, the cover of the present invention can be appropriately modified without departing from the spirit of the present invention.

Claims

1. A lid for sealing the opening of a container, characterized in that it is made of a raw material mainly composed of paper, having a sidewall portion that fits into the opening of the container and a top cover portion surrounding the sidewall portion, the top cover portion having an inlet / outlet forming portion that forms an inlet / outlet for receiving an article inside the container, the inlet / outlet forming portion having a sealing plate that closes the inlet / outlet forming portion, the sealing plate being formed to be openable and closable via a hinge portion, a stress-reducing portion being formed at the base end side where the hinge portion is formed, the stress-reducing portion being used to reduce stress generated relative to the force applied when lifting the sealing plate, the stress-reducing portion having a groove for dispersing the stress, the groove being formed to extend in a direction different from the direction of the force applied to the sealing plate at the base end end, and a bending line being formed at the hinge portion.

2. The cover according to claim 1, characterized in that, On the closure sheet, around the hinge portion, a dotted joint or a half-cut portion is formed on the top cover portion.

3. The cover according to claim 1 or 2, characterized in that, The closure piece is formed such that the width of the front end side, which is separated from the hinge portion, is greater than the width of the base end side where the hinge portion is formed.

4. The cover according to claim 1 or 2, characterized in that, The closure piece is formed such that the width of the base end side where the hinge portion is formed is the same as the width of the front end side at a position away from the hinge portion.

5. The cover according to claim 1 or 2, characterized in that, A bend line is formed around the periphery of the entrance / exit forming portion near the side wall portion.

6. The cover according to claim 1 or 2, characterized in that, The inlet / outlet forming part is located at a position where the opening end of the container can be visually confirmed.

7. The cover according to claim 1 or 2, characterized in that, The entrance / exit forming portion is located at a position offset from the center of the top cover portion.

8. The cover according to claim 1 or 2, characterized in that, A sealing component is installed in the inlet / outlet forming section.

9. The cover according to claim 2, characterized in that, A sealing component is installed in the inlet / outlet forming part, and the sealing piece forms the inlet / outlet by cutting off the dotted joint or the half-section through the sealing component.

10. The cover according to claim 8, characterized in that, The sealing component is installed at a position offset from the center of the inlet / outlet forming portion.

11. The cover according to claim 8, characterized in that, The sealing component is installed in the inlet / outlet forming portion at a position away from the center of the top cover portion.

12. The cover according to claim 11, characterized in that, The sealing component is installed in the inlet / outlet forming portion at the position furthest from the center of the top cover portion.

13. The cover according to claim 8, characterized in that, The sealing member has one end installed on the inlet / outlet forming portion and another end opposite to the first end, the other end being installed on the surface of the top cover portion in a peelable state.

14. The cover according to claim 13, characterized in that, The other end is mounted to the surface of the top cover in a peelable state at a predetermined position that approaches one end only from the other end of the sealing member at a predetermined distance.

15. The cover according to claim 14, characterized in that, A pinching portion is formed at the other end of the sealing component.

16. The cover according to claim 15, characterized in that, The pinching portion is formed as a non-joining portion that does not engage with the surface of the top cover portion.

17. The cover according to claim 13, characterized in that, The sealing member is configured such that the other end can be reinstalled after being peeled off from the surface of the top cover.

18. The cover according to claim 13, characterized in that, The sealing member is configured such that the installation strength at one end is greater than the installation strength at the other end.

19. The cover according to claim 8, characterized in that, The sealing component is provided in such a way that it covers at least a portion of the inlet / outlet forming portion.

20. The cover according to claim 8, characterized in that, The sealing component has a width greater than or equal to the width of the inlet / outlet forming portion.

21. The cover according to claim 8, characterized in that, The sealing member is configured such that one end extends further than one end of the inlet / outlet forming portion.

22. The cover according to claim 8, characterized in that, The sealing component has one end that engages with the surface of the top cover.

23. The cover according to claim 8, characterized in that, The sealing component has a portion at one end that does not engage with the surface of the top cover.

24. The cover according to claim 1 or 2, characterized in that, The top cover has grooves between the inner edge of the entrance / exit and the outer edge of the entrance / exit forming part.

25. The cover according to claim 1 or 2, characterized in that, The top cover portion has a top cover edge portion at a location closer to the side wall portion than the entrance / exit forming portion, and the groove is formed between the outer edge portion of the entrance / exit forming portion and the inner edge portion of the top cover edge portion.

26. The cover according to claim 1 or 2, characterized in that, It has a temporary fixing part for temporarily fixing the inlet / outlet forming part to the top cover part.

27. The cover according to claim 25, characterized in that, The top cover has a temporary fixing part for temporarily fixing the entrance / exit forming part to the top cover. The temporary fixing part is formed in a manner that spans the entrance / exit forming part, the groove, and the edge of the top cover.

28. The cover according to claim 26, characterized in that, The temporary fixing part is temporarily fixed from the surface of the entrance / exit forming part and the top cover part.

29. The cover according to claim 26, characterized in that, The groove has a predetermined width between the inner edge of the entrance / exit and the outer edge of the entrance / exit forming portion, and the width of the groove in the portion where the temporary fixing portion is formed is different from the width of the groove in the portion where the temporary fixing portion is not formed.

30. The cover according to claim 29, characterized in that, The width of the groove in the area where the temporary fixing part is formed is narrower than the width of the groove in the area where the temporary fixing part is not formed.

31. The cover according to claim 26, characterized in that, In the location where the temporary fixing part is formed, the inner edge of the entrance / exit contacts the outer edge of the entrance / exit forming part.

32. The cover according to claim 8, characterized in that, The top cover has a temporary fixing part, which is used to temporarily fix the inlet / outlet forming part to the top cover. One end of the sealing member is temporarily fixed together with the inlet / outlet forming part and the top cover by the temporary fixing part.

33. The cover according to claim 1 or 2, characterized in that, The top cover has a guide path that guides the contents of the container that are coming out of the inlet toward the inlet.

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